[PATCH v2 00/36] object_id part 12

[PATCH v2 00/36] object_id part 12

[brian m. carlson]

This is the twelfth in a series of patches to convert various parts of
the code to struct object_id.

The primary changes here are to the sha1_file code, find_unique_abbrev,
and lookup_replace_object.  Due to the circular nature of converting the
latter, there are several places where we briefly insert temporaries to
allow a multi-patch conversion.

Also included is a constant for object header length allocation.  This
isn't strictly related to the series, but it makes for a nice cleanup of
hard-coded constants, which is good for maintainability.

This series further decreases the number of hard-coded constants in the
code.  After this series, there are only 172 instances of the constant
"20" in the code (for any purpose) and 98 instances of "40".

Changes from v1:
* Rebase onto master.

brian m. carlson (36):
  bulk-checkin: convert index_bulk_checkin to struct object_id
  builtin/write-tree: convert to struct object_id
  cache-tree: convert write_*_as_tree to object_id
  cache-tree: convert remnants to struct object_id
  resolve-undo: convert struct resolve_undo_info to object_id
  tree: convert read_tree_recursive to struct object_id
  ref-filter: convert grab_objectname to struct object_id
  strbuf: convert strbuf_add_unique_abbrev to use struct object_id
  wt-status: convert struct wt_status_state to object_id
  Convert find_unique_abbrev* to struct object_id
  http-walker: convert struct object_request to use struct object_id
  send-pack: convert remaining functions to struct object_id
  replace_object: convert struct replace_object to object_id
  builtin/mktag: convert to struct object_id
  archive: convert write_archive_entry_fn_t to object_id
  archive: convert sha1_file_to_archive to struct object_id
  builtin/index-pack: convert struct ref_delta_entry to object_id
  sha1_file: convert read_loose_object to use struct object_id
  sha1_file: convert check_sha1_signature to struct object_id
  streaming: convert open_istream to use struct object_id
  builtin/mktree: convert to struct object_id
  sha1_file: convert assert_sha1_type to object_id
  sha1_file: convert retry_bad_packed_offset to struct object_id
  packfile: convert unpack_entry to struct object_id
  Convert remaining callers of sha1_object_info_extended to object_id
  sha1_file: convert sha1_object_info* to object_id
  builtin/fmt-merge-msg: convert remaining code to object_id
  builtin/notes: convert static functions to object_id
  tree-walk: convert get_tree_entry_follow_symlinks internals to
    object_id
  streaming: convert istream internals to struct object_id
  tree-walk: convert tree entry functions to object_id
  sha1_file: convert read_object_with_reference to object_id
  sha1_file: convert read_sha1_file to struct object_id
  Convert lookup_replace_object to struct object_id
  sha1_file: introduce a constant for max header length
  convert: convert to struct object_id

 apply.c                  |   4 +-
 archive-tar.c            |  28 ++++----
 archive-zip.c            |  18 ++---
 archive.c                |  32 ++++-----
 archive.h                |  10 +--
 bisect.c                 |   3 +-
 blame.c                  |  18 +++--
 builtin/am.c             |   8 +--
 builtin/blame.c          |   2 +-
 builtin/branch.c         |   2 +-
 builtin/cat-file.c       |  30 +++++----
 builtin/checkout.c       |  12 ++--
 builtin/commit-tree.c    |   2 +-
 builtin/describe.c       |   4 +-
 builtin/difftool.c       |   2 +-
 builtin/fast-export.c    |   8 +--
 builtin/fetch.c          |  10 +--
 builtin/fmt-merge-msg.c  |   4 +-
 builtin/fsck.c           |   4 +-
 builtin/grep.c           |   6 +-
 builtin/index-pack.c     |  43 ++++++------
 builtin/log.c            |   8 +--
 builtin/ls-files.c       |   4 +-
 builtin/ls-tree.c        |   8 +--
 builtin/merge-tree.c     |   5 +-
 builtin/merge.c          |   8 +--
 builtin/mktag.c          |  20 +++---
 builtin/mktree.c         |  24 +++----
 builtin/name-rev.c       |   2 +-
 builtin/notes.c          |  14 ++--
 builtin/pack-objects.c   |  27 ++++----
 builtin/prune.c          |   2 +-
 builtin/receive-pack.c   |   8 +--
 builtin/reflog.c         |   2 +-
 builtin/replace.c        |  10 +--
 builtin/reset.c          |   2 +-
 builtin/rev-list.c       |   2 +-
 builtin/rev-parse.c      |   2 +-
 builtin/rm.c             |   2 +-
 builtin/show-branch.c    |   2 +-
 builtin/show-ref.c       |   4 +-
 builtin/tag.c            |  16 +++--
 builtin/unpack-file.c    |   2 +-
 builtin/unpack-objects.c |   4 +-
 builtin/update-index.c   |   2 +-
 builtin/verify-commit.c  |   2 +-
 builtin/worktree.c       |   4 +-
 builtin/write-tree.c     |   6 +-
 bulk-checkin.c           |  18 ++---
 bulk-checkin.h           |   2 +-
 bundle.c                 |   2 +-
 cache-tree.c             |  36 +++++-----
 cache-tree.h             |   4 +-
 cache.h                  |  42 ++++++------
 combine-diff.c           |   6 +-
 commit.c                 |   8 +--
 config.c                 |   2 +-
 convert.c                |  12 ++--
 convert.h                |   2 +-
 diff.c                   |   6 +-
 dir.c                    |   2 +-
 entry.c                  |   4 +-
 fast-import.c            |  31 ++++-----
 fsck.c                   |   2 +-
 grep.c                   |   2 +-
 http-push.c              |   2 +-
 http-walker.c            |  16 ++---
 line-log.c               |   3 +-
 list-objects-filter.c    |   2 +-
 log-tree.c               |  12 ++--
 mailmap.c                |   2 +-
 match-trees.c            |  10 +--
 merge-blobs.c            |   4 +-
 merge-recursive.c        |  20 +++---
 notes-cache.c            |   2 +-
 notes-merge.c            |   2 +-
 notes.c                  |  10 +--
 object.c                 |  12 ++--
 pack-bitmap-write.c      |   3 +-
 pack-check.c             |   4 +-
 packfile.c               |  30 ++++-----
 pretty.c                 |   8 +--
 reachable.c              |   2 +-
 read-cache.c             |   4 +-
 ref-filter.c             |  14 ++--
 refs.c                   |   2 +-
 remote-testsvn.c         |   4 +-
 remote.c                 |   2 +-
 replace_object.c         |  26 ++++----
 rerere.c                 |   4 +-
 resolve-undo.c           |   8 +--
 resolve-undo.h           |   2 +-
 send-pack.c              |  12 ++--
 sequencer.c              |   9 +--
 sha1_file.c              | 137 ++++++++++++++++++++-------------------
 sha1_name.c              |  31 +++++----
 strbuf.c                 |   4 +-
 strbuf.h                 |   8 ++-
 streaming.c              |  18 ++---
 streaming.h              |   2 +-
 submodule-config.c       |   2 +-
 submodule.c              |   6 +-
 tag.c                    |  10 +--
 transport.c              |   6 +-
 tree-walk.c              |  45 +++++++------
 tree-walk.h              |   2 +-
 tree.c                   |  16 ++---
 tree.h                   |   2 +-
 wt-status.c              |  20 +++---
 wt-status.h              |   6 +-
 xdiff-interface.c        |   2 +-
 111 files changed, 591 insertions(+), 580 deletions(-)

[PATCH v2 01/36] bulk-checkin: convert index_bulk_checkin to struct object_id

[brian m. carlson]

Convert the index_bulk_checkin function, and the static functions it
calls, to use pointers to struct object_id.

Signed-off-by: brian m. carlson <sandals@crustytoothpaste.net>
---
 bulk-checkin.c | 18 +++++++++---------
 bulk-checkin.h |  2 +-
 sha1_file.c    |  2 +-
 3 files changed, 11 insertions(+), 11 deletions(-)

diff --git a/bulk-checkin.c b/bulk-checkin.c
index 8bcd1c8665..6f5ee25bff 100644
--- a/bulk-checkin.c
+++ b/bulk-checkin.c
@@ -60,17 +60,17 @@ static void finish_bulk_checkin(struct bulk_checkin_state *state)
 	reprepare_packed_git();
 }
 
-static int already_written(struct bulk_checkin_state *state, unsigned char sha1[])
+static int already_written(struct bulk_checkin_state *state, struct object_id *oid)
 {
 	int i;
 
 	/* The object may already exist in the repository */
-	if (has_sha1_file(sha1))
+	if (has_sha1_file(oid->hash))
 		return 1;
 
 	/* Might want to keep the list sorted */
 	for (i = 0; i < state->nr_written; i++)
-		if (!hashcmp(state->written[i]->oid.hash, sha1))
+		if (!oidcmp(&state->written[i]->oid, oid))
 			return 1;
 
 	/* This is a new object we need to keep */
@@ -186,7 +186,7 @@ static void prepare_to_stream(struct bulk_checkin_state *state,
 }
 
 static int deflate_to_pack(struct bulk_checkin_state *state,
-			   unsigned char result_sha1[],
+			   struct object_id *result_oid,
 			   int fd, size_t size,
 			   enum object_type type, const char *path,
 			   unsigned flags)
@@ -236,17 +236,17 @@ static int deflate_to_pack(struct bulk_checkin_state *state,
 		if (lseek(fd, seekback, SEEK_SET) == (off_t) -1)
 			return error("cannot seek back");
 	}
-	the_hash_algo->final_fn(result_sha1, &ctx);
+	the_hash_algo->final_fn(result_oid->hash, &ctx);
 	if (!idx)
 		return 0;
 
 	idx->crc32 = crc32_end(state->f);
-	if (already_written(state, result_sha1)) {
+	if (already_written(state, result_oid)) {
 		hashfile_truncate(state->f, &checkpoint);
 		state->offset = checkpoint.offset;
 		free(idx);
 	} else {
-		hashcpy(idx->oid.hash, result_sha1);
+		oidcpy(&idx->oid, result_oid);
 		ALLOC_GROW(state->written,
 			   state->nr_written + 1,
 			   state->alloc_written);
@@ -255,11 +255,11 @@ static int deflate_to_pack(struct bulk_checkin_state *state,
 	return 0;
 }
 
-int index_bulk_checkin(unsigned char *sha1,
+int index_bulk_checkin(struct object_id *oid,
 		       int fd, size_t size, enum object_type type,
 		       const char *path, unsigned flags)
 {
-	int status = deflate_to_pack(&state, sha1, fd, size, type,
+	int status = deflate_to_pack(&state, oid, fd, size, type,
 				     path, flags);
 	if (!state.plugged)
 		finish_bulk_checkin(&state);
diff --git a/bulk-checkin.h b/bulk-checkin.h
index fbd40fc98c..a85527318b 100644
--- a/bulk-checkin.h
+++ b/bulk-checkin.h
@@ -4,7 +4,7 @@
 #ifndef BULK_CHECKIN_H
 #define BULK_CHECKIN_H
 
-extern int index_bulk_checkin(unsigned char sha1[],
+extern int index_bulk_checkin(struct object_id *oid,
 			      int fd, size_t size, enum object_type type,
 			      const char *path, unsigned flags);
 
diff --git a/sha1_file.c b/sha1_file.c
index 826d7a0ae3..c1d06c6109 100644
--- a/sha1_file.c
+++ b/sha1_file.c
@@ -1892,7 +1892,7 @@ static int index_stream(struct object_id *oid, int fd, size_t size,
 			enum object_type type, const char *path,
 			unsigned flags)
 {
-	return index_bulk_checkin(oid->hash, fd, size, type, path, flags);
+	return index_bulk_checkin(oid, fd, size, type, path, flags);
 }
 
 int index_fd(struct object_id *oid, int fd, struct stat *st,

[PATCH v2 02/36] builtin/write-tree: convert to struct object_id

[brian m. carlson]

This is needed to convert parts of the cache-tree code.

Signed-off-by: brian m. carlson <sandals@crustytoothpaste.net>
---
 builtin/write-tree.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/builtin/write-tree.c b/builtin/write-tree.c
index bd0a78aa3c..299a121531 100644
--- a/builtin/write-tree.c
+++ b/builtin/write-tree.c
@@ -19,7 +19,7 @@ int cmd_write_tree(int argc, const char **argv, const char *unused_prefix)
 {
 	int flags = 0, ret;
 	const char *prefix = NULL;
-	unsigned char sha1[20];
+	struct object_id oid;
 	const char *me = "git-write-tree";
 	struct option write_tree_options[] = {
 		OPT_BIT(0, "missing-ok", &flags, N_("allow missing objects"),
@@ -38,10 +38,10 @@ int cmd_write_tree(int argc, const char **argv, const char *unused_prefix)
 	argc = parse_options(argc, argv, unused_prefix, write_tree_options,
 			     write_tree_usage, 0);
 
-	ret = write_cache_as_tree(sha1, flags, prefix);
+	ret = write_cache_as_tree(oid.hash, flags, prefix);
 	switch (ret) {
 	case 0:
-		printf("%s\n", sha1_to_hex(sha1));
+		printf("%s\n", oid_to_hex(&oid));
 		break;
 	case WRITE_TREE_UNREADABLE_INDEX:
 		die("%s: error reading the index", me);

[PATCH v2 03/36] cache-tree: convert write_*_as_tree to object_id

[brian m. carlson]

Convert write_index_as_tree and write_cache_as_tree to use struct
object_id.

Signed-off-by: brian m. carlson <sandals@crustytoothpaste.net>
---
 builtin/am.c         |  8 ++++----
 builtin/merge.c      |  2 +-
 builtin/write-tree.c |  2 +-
 cache-tree.c         | 10 +++++-----
 cache-tree.h         |  4 ++--
 sequencer.c          |  4 ++--
 6 files changed, 15 insertions(+), 15 deletions(-)

diff --git a/builtin/am.c b/builtin/am.c
index 6661edc162..220c5deed8 100644
--- a/builtin/am.c
+++ b/builtin/am.c
@@ -1546,7 +1546,7 @@ static int fall_back_threeway(const struct am_state *state, const char *index_pa
 	discard_cache();
 	read_cache_from(index_path);
 
-	if (write_index_as_tree(orig_tree.hash, &the_index, index_path, 0, NULL))
+	if (write_index_as_tree(&orig_tree, &the_index, index_path, 0, NULL))
 		return error(_("Repository lacks necessary blobs to fall back on 3-way merge."));
 
 	say(state, stdout, _("Using index info to reconstruct a base tree..."));
@@ -1571,7 +1571,7 @@ static int fall_back_threeway(const struct am_state *state, const char *index_pa
 		return error(_("Did you hand edit your patch?\n"
 				"It does not apply to blobs recorded in its index."));
 
-	if (write_index_as_tree(their_tree.hash, &the_index, index_path, 0, NULL))
+	if (write_index_as_tree(&their_tree, &the_index, index_path, 0, NULL))
 		return error("could not write tree");
 
 	say(state, stdout, _("Falling back to patching base and 3-way merge..."));
@@ -1622,7 +1622,7 @@ static void do_commit(const struct am_state *state)
 	if (run_hook_le(NULL, "pre-applypatch", NULL))
 		exit(1);
 
-	if (write_cache_as_tree(tree.hash, 0, NULL))
+	if (write_cache_as_tree(&tree, 0, NULL))
 		die(_("git write-tree failed to write a tree"));
 
 	if (!get_oid_commit("HEAD", &parent)) {
@@ -2001,7 +2001,7 @@ static int clean_index(const struct object_id *head, const struct object_id *rem
 	if (fast_forward_to(head_tree, head_tree, 1))
 		return -1;
 
-	if (write_cache_as_tree(index.hash, 0, NULL))
+	if (write_cache_as_tree(&index, 0, NULL))
 		return -1;
 
 	index_tree = parse_tree_indirect(&index);
diff --git a/builtin/merge.c b/builtin/merge.c
index 92ba99a1a5..861b170468 100644
--- a/builtin/merge.c
+++ b/builtin/merge.c
@@ -638,7 +638,7 @@ static int read_tree_trivial(struct object_id *common, struct object_id *head,
 
 static void write_tree_trivial(struct object_id *oid)
 {
-	if (write_cache_as_tree(oid->hash, 0, NULL))
+	if (write_cache_as_tree(oid, 0, NULL))
 		die(_("git write-tree failed to write a tree"));
 }
 
diff --git a/builtin/write-tree.c b/builtin/write-tree.c
index 299a121531..c9d3c544e7 100644
--- a/builtin/write-tree.c
+++ b/builtin/write-tree.c
@@ -38,7 +38,7 @@ int cmd_write_tree(int argc, const char **argv, const char *unused_prefix)
 	argc = parse_options(argc, argv, unused_prefix, write_tree_options,
 			     write_tree_usage, 0);
 
-	ret = write_cache_as_tree(oid.hash, flags, prefix);
+	ret = write_cache_as_tree(&oid, flags, prefix);
 	switch (ret) {
 	case 0:
 		printf("%s\n", oid_to_hex(&oid));
diff --git a/cache-tree.c b/cache-tree.c
index c52e4303df..ba07a8067e 100644
--- a/cache-tree.c
+++ b/cache-tree.c
@@ -599,7 +599,7 @@ static struct cache_tree *cache_tree_find(struct cache_tree *it, const char *pat
 	return it;
 }
 
-int write_index_as_tree(unsigned char *sha1, struct index_state *index_state, const char *index_path, int flags, const char *prefix)
+int write_index_as_tree(struct object_id *oid, struct index_state *index_state, const char *index_path, int flags, const char *prefix)
 {
 	int entries, was_valid;
 	struct lock_file lock_file = LOCK_INIT;
@@ -640,19 +640,19 @@ int write_index_as_tree(unsigned char *sha1, struct index_state *index_state, co
 			ret = WRITE_TREE_PREFIX_ERROR;
 			goto out;
 		}
-		hashcpy(sha1, subtree->oid.hash);
+		oidcpy(oid, &subtree->oid);
 	}
 	else
-		hashcpy(sha1, index_state->cache_tree->oid.hash);
+		oidcpy(oid, &index_state->cache_tree->oid);
 
 out:
 	rollback_lock_file(&lock_file);
 	return ret;
 }
 
-int write_cache_as_tree(unsigned char *sha1, int flags, const char *prefix)
+int write_cache_as_tree(struct object_id *oid, int flags, const char *prefix)
 {
-	return write_index_as_tree(sha1, &the_index, get_index_file(), flags, prefix);
+	return write_index_as_tree(oid, &the_index, get_index_file(), flags, prefix);
 }
 
 static void prime_cache_tree_rec(struct cache_tree *it, struct tree *tree)
diff --git a/cache-tree.h b/cache-tree.h
index f7b9cab7ee..cfd5328cc9 100644
--- a/cache-tree.h
+++ b/cache-tree.h
@@ -47,8 +47,8 @@ int update_main_cache_tree(int);
 #define WRITE_TREE_UNMERGED_INDEX (-2)
 #define WRITE_TREE_PREFIX_ERROR (-3)
 
-int write_index_as_tree(unsigned char *sha1, struct index_state *index_state, const char *index_path, int flags, const char *prefix);
-int write_cache_as_tree(unsigned char *sha1, int flags, const char *prefix);
+int write_index_as_tree(struct object_id *oid, struct index_state *index_state, const char *index_path, int flags, const char *prefix);
+int write_cache_as_tree(struct object_id *oid, int flags, const char *prefix);
 void prime_cache_tree(struct index_state *, struct tree *);
 
 extern int cache_tree_matches_traversal(struct cache_tree *, struct name_entry *ent, struct traverse_info *info);
diff --git a/sequencer.c b/sequencer.c
index e9baaf59bd..d2fc1871ed 100644
--- a/sequencer.c
+++ b/sequencer.c
@@ -1113,7 +1113,7 @@ static int try_to_commit(struct strbuf *msg, const char *author,
 		commit_list_insert(current_head, &parents);
 	}
 
-	if (write_cache_as_tree(tree.hash, 0, NULL)) {
+	if (write_cache_as_tree(&tree, 0, NULL)) {
 		res = error(_("git write-tree failed to write a tree"));
 		goto out;
 	}
@@ -1475,7 +1475,7 @@ static int do_pick_commit(enum todo_command command, struct commit *commit,
 		 * that represents the "current" state for merge-recursive
 		 * to work on.
 		 */
-		if (write_cache_as_tree(head.hash, 0, NULL))
+		if (write_cache_as_tree(&head, 0, NULL))
 			return error(_("your index file is unmerged."));
 	} else {
 		unborn = get_oid("HEAD", &head);

[PATCH v2 04/36] cache-tree: convert remnants to struct object_id

[brian m. carlson]

Convert the remaining portions of cache-tree.c to use struct object_id.
Convert several instances of 20 to use the_hash_algo instead.

Signed-off-by: brian m. carlson <sandals@crustytoothpaste.net>
---
 cache-tree.c | 26 +++++++++++++-------------
 1 file changed, 13 insertions(+), 13 deletions(-)

diff --git a/cache-tree.c b/cache-tree.c
index ba07a8067e..601dd1bb1f 100644
--- a/cache-tree.c
+++ b/cache-tree.c
@@ -320,7 +320,7 @@ static int update_one(struct cache_tree *it,
 		struct cache_tree_sub *sub = NULL;
 		const char *path, *slash;
 		int pathlen, entlen;
-		const unsigned char *sha1;
+		const struct object_id *oid;
 		unsigned mode;
 		int expected_missing = 0;
 		int contains_ita = 0;
@@ -338,7 +338,7 @@ static int update_one(struct cache_tree *it,
 				die("cache-tree.c: '%.*s' in '%s' not found",
 				    entlen, path + baselen, path);
 			i += sub->count;
-			sha1 = sub->cache_tree->oid.hash;
+			oid = &sub->cache_tree->oid;
 			mode = S_IFDIR;
 			contains_ita = sub->cache_tree->entry_count < 0;
 			if (contains_ita) {
@@ -347,19 +347,19 @@ static int update_one(struct cache_tree *it,
 			}
 		}
 		else {
-			sha1 = ce->oid.hash;
+			oid = &ce->oid;
 			mode = ce->ce_mode;
 			entlen = pathlen - baselen;
 			i++;
 		}
 
-		if (is_null_sha1(sha1) ||
-		    (mode != S_IFGITLINK && !missing_ok && !has_sha1_file(sha1))) {
+		if (is_null_oid(oid) ||
+		    (mode != S_IFGITLINK && !missing_ok && !has_object_file(oid))) {
 			strbuf_release(&buffer);
 			if (expected_missing)
 				return -1;
 			return error("invalid object %06o %s for '%.*s'",
-				mode, sha1_to_hex(sha1), entlen+baselen, path);
+				mode, oid_to_hex(oid), entlen+baselen, path);
 		}
 
 		/*
@@ -385,12 +385,12 @@ static int update_one(struct cache_tree *it,
 		/*
 		 * "sub" can be an empty tree if all subentries are i-t-a.
 		 */
-		if (contains_ita && !hashcmp(sha1, EMPTY_TREE_SHA1_BIN))
+		if (contains_ita && !oidcmp(oid, &empty_tree_oid))
 			continue;
 
 		strbuf_grow(&buffer, entlen + 100);
 		strbuf_addf(&buffer, "%o %.*s%c", mode, entlen, path + baselen, '\0');
-		strbuf_add(&buffer, sha1, 20);
+		strbuf_add(&buffer, oid->hash, the_hash_algo->rawsz);
 
 #if DEBUG
 		fprintf(stderr, "cache-tree update-one %o %.*s\n",
@@ -401,7 +401,7 @@ static int update_one(struct cache_tree *it,
 	if (repair) {
 		struct object_id oid;
 		hash_object_file(buffer.buf, buffer.len, tree_type, &oid);
-		if (has_sha1_file(oid.hash))
+		if (has_object_file(&oid))
 			oidcpy(&it->oid, &oid);
 		else
 			to_invalidate = 1;
@@ -465,7 +465,7 @@ static void write_one(struct strbuf *buffer, struct cache_tree *it,
 #endif
 
 	if (0 <= it->entry_count) {
-		strbuf_add(buffer, it->oid.hash, 20);
+		strbuf_add(buffer, it->oid.hash, the_hash_algo->rawsz);
 	}
 	for (i = 0; i < it->subtree_nr; i++) {
 		struct cache_tree_sub *down = it->down[i];
@@ -520,11 +520,11 @@ static struct cache_tree *read_one(const char **buffer, unsigned long *size_p)
 		goto free_return;
 	buf++; size--;
 	if (0 <= it->entry_count) {
-		if (size < 20)
+		if (size < the_hash_algo->rawsz)
 			goto free_return;
 		hashcpy(it->oid.hash, (const unsigned char*)buf);
-		buf += 20;
-		size -= 20;
+		buf += the_hash_algo->rawsz;
+		size -= the_hash_algo->rawsz;
 	}
 
 #if DEBUG

[PATCH v2 05/36] resolve-undo: convert struct resolve_undo_info to object_id

[brian m. carlson]

Convert the sha1 member of this struct to be an array of struct
object_id instead.  This change is needed to convert find_unique_abbrev.

Signed-off-by: brian m. carlson <sandals@crustytoothpaste.net>
---
 builtin/ls-files.c | 2 +-
 resolve-undo.c     | 8 ++++----
 resolve-undo.h     | 2 +-
 3 files changed, 6 insertions(+), 6 deletions(-)

diff --git a/builtin/ls-files.c b/builtin/ls-files.c
index 2fc836e330..9df66ba307 100644
--- a/builtin/ls-files.c
+++ b/builtin/ls-files.c
@@ -271,7 +271,7 @@ static void show_ru_info(const struct index_state *istate)
 			if (!ui->mode[i])
 				continue;
 			printf("%s%06o %s %d\t", tag_resolve_undo, ui->mode[i],
-			       find_unique_abbrev(ui->sha1[i], abbrev),
+			       find_unique_abbrev(ui->oid[i].hash, abbrev),
 			       i + 1);
 			write_name(path);
 		}
diff --git a/resolve-undo.c b/resolve-undo.c
index b40f3173d3..109c658a85 100644
--- a/resolve-undo.c
+++ b/resolve-undo.c
@@ -24,7 +24,7 @@ void record_resolve_undo(struct index_state *istate, struct cache_entry *ce)
 	if (!lost->util)
 		lost->util = xcalloc(1, sizeof(*ui));
 	ui = lost->util;
-	hashcpy(ui->sha1[stage - 1], ce->oid.hash);
+	oidcpy(&ui->oid[stage - 1], &ce->oid);
 	ui->mode[stage - 1] = ce->ce_mode;
 }
 
@@ -44,7 +44,7 @@ void resolve_undo_write(struct strbuf *sb, struct string_list *resolve_undo)
 		for (i = 0; i < 3; i++) {
 			if (!ui->mode[i])
 				continue;
-			strbuf_add(sb, ui->sha1[i], 20);
+			strbuf_add(sb, ui->oid[i].hash, the_hash_algo->rawsz);
 		}
 	}
 }
@@ -89,7 +89,7 @@ struct string_list *resolve_undo_read(const char *data, unsigned long size)
 				continue;
 			if (size < 20)
 				goto error;
-			hashcpy(ui->sha1[i], (const unsigned char *)data);
+			hashcpy(ui->oid[i].hash, (const unsigned char *)data);
 			size -= 20;
 			data += 20;
 		}
@@ -145,7 +145,7 @@ int unmerge_index_entry_at(struct index_state *istate, int pos)
 		struct cache_entry *nce;
 		if (!ru->mode[i])
 			continue;
-		nce = make_cache_entry(ru->mode[i], ru->sha1[i],
+		nce = make_cache_entry(ru->mode[i], ru->oid[i].hash,
 				       name, i + 1, 0);
 		if (matched)
 			nce->ce_flags |= CE_MATCHED;
diff --git a/resolve-undo.h b/resolve-undo.h
index 46306455ed..87291904bd 100644
--- a/resolve-undo.h
+++ b/resolve-undo.h
@@ -3,7 +3,7 @@
 
 struct resolve_undo_info {
 	unsigned int mode[3];
-	unsigned char sha1[3][20];
+	struct object_id oid[3];
 };
 
 extern void record_resolve_undo(struct index_state *, struct cache_entry *);

[PATCH v2 06/36] tree: convert read_tree_recursive to struct object_id

[brian m. carlson]

Convert the callback functions for read_tree_recursive to take a pointer
to struct object_id.

Signed-off-by: brian m. carlson <sandals@crustytoothpaste.net>
---
 archive.c          |  8 ++++----
 builtin/checkout.c |  4 ++--
 builtin/log.c      |  2 +-
 builtin/ls-tree.c  |  8 ++++----
 merge-recursive.c  |  2 +-
 tree.c             | 14 +++++++-------
 tree.h             |  2 +-
 7 files changed, 20 insertions(+), 20 deletions(-)

diff --git a/archive.c b/archive.c
index 0b7b62af0c..e664cdb624 100644
--- a/archive.c
+++ b/archive.c
@@ -198,7 +198,7 @@ static int write_directory(struct archiver_context *c)
 	return ret ? -1 : 0;
 }
 
-static int queue_or_write_archive_entry(const unsigned char *sha1,
+static int queue_or_write_archive_entry(const struct object_id *oid,
 		struct strbuf *base, const char *filename,
 		unsigned mode, int stage, void *context)
 {
@@ -224,14 +224,14 @@ static int queue_or_write_archive_entry(const unsigned char *sha1,
 
 		if (check_attr_export_ignore(check))
 			return 0;
-		queue_directory(sha1, base, filename,
+		queue_directory(oid->hash, base, filename,
 				mode, stage, c);
 		return READ_TREE_RECURSIVE;
 	}
 
 	if (write_directory(c))
 		return -1;
-	return write_archive_entry(sha1, base->buf, base->len, filename, mode,
+	return write_archive_entry(oid->hash, base->buf, base->len, filename, mode,
 				   stage, context);
 }
 
@@ -303,7 +303,7 @@ static const struct archiver *lookup_archiver(const char *name)
 	return NULL;
 }
 
-static int reject_entry(const unsigned char *sha1, struct strbuf *base,
+static int reject_entry(const struct object_id *oid, struct strbuf *base,
 			const char *filename, unsigned mode,
 			int stage, void *context)
 {
diff --git a/builtin/checkout.c b/builtin/checkout.c
index 191b96c49c..87182aa018 100644
--- a/builtin/checkout.c
+++ b/builtin/checkout.c
@@ -66,7 +66,7 @@ static int post_checkout_hook(struct commit *old, struct commit *new,
 
 }
 
-static int update_some(const unsigned char *sha1, struct strbuf *base,
+static int update_some(const struct object_id *oid, struct strbuf *base,
 		const char *pathname, unsigned mode, int stage, void *context)
 {
 	int len;
@@ -78,7 +78,7 @@ static int update_some(const unsigned char *sha1, struct strbuf *base,
 
 	len = base->len + strlen(pathname);
 	ce = xcalloc(1, cache_entry_size(len));
-	hashcpy(ce->oid.hash, sha1);
+	oidcpy(&ce->oid, oid);
 	memcpy(ce->name, base->buf, base->len);
 	memcpy(ce->name + base->len, pathname, len - base->len);
 	ce->ce_flags = create_ce_flags(0) | CE_UPDATE;
diff --git a/builtin/log.c b/builtin/log.c
index 94ee177d56..32a744bfd2 100644
--- a/builtin/log.c
+++ b/builtin/log.c
@@ -541,7 +541,7 @@ static int show_tag_object(const struct object_id *oid, struct rev_info *rev)
 	return 0;
 }
 
-static int show_tree_object(const unsigned char *sha1,
+static int show_tree_object(const struct object_id *oid,
 		struct strbuf *base,
 		const char *pathname, unsigned mode, int stage, void *context)
 {
diff --git a/builtin/ls-tree.c b/builtin/ls-tree.c
index ef965408e8..c613dd7b82 100644
--- a/builtin/ls-tree.c
+++ b/builtin/ls-tree.c
@@ -60,7 +60,7 @@ static int show_recursive(const char *base, int baselen, const char *pathname)
 	return 0;
 }
 
-static int show_tree(const unsigned char *sha1, struct strbuf *base,
+static int show_tree(const struct object_id *oid, struct strbuf *base,
 		const char *pathname, unsigned mode, int stage, void *context)
 {
 	int retval = 0;
@@ -94,7 +94,7 @@ static int show_tree(const unsigned char *sha1, struct strbuf *base,
 			char size_text[24];
 			if (!strcmp(type, blob_type)) {
 				unsigned long size;
-				if (sha1_object_info(sha1, &size) == OBJ_BAD)
+				if (sha1_object_info(oid->hash, &size) == OBJ_BAD)
 					xsnprintf(size_text, sizeof(size_text),
 						  "BAD");
 				else
@@ -103,11 +103,11 @@ static int show_tree(const unsigned char *sha1, struct strbuf *base,
 			} else
 				xsnprintf(size_text, sizeof(size_text), "-");
 			printf("%06o %s %s %7s\t", mode, type,
-			       find_unique_abbrev(sha1, abbrev),
+			       find_unique_abbrev(oid->hash, abbrev),
 			       size_text);
 		} else
 			printf("%06o %s %s\t", mode, type,
-			       find_unique_abbrev(sha1, abbrev));
+			       find_unique_abbrev(oid->hash, abbrev));
 	}
 	baselen = base->len;
 	strbuf_addstr(base, pathname);
diff --git a/merge-recursive.c b/merge-recursive.c
index 6ff971f9a2..c886f2e9cd 100644
--- a/merge-recursive.c
+++ b/merge-recursive.c
@@ -335,7 +335,7 @@ struct tree *write_tree_from_memory(struct merge_options *o)
 	return result;
 }
 
-static int save_files_dirs(const unsigned char *sha1,
+static int save_files_dirs(const struct object_id *oid,
 		struct strbuf *base, const char *path,
 		unsigned int mode, int stage, void *context)
 {
diff --git a/tree.c b/tree.c
index b224115e0f..1a0f03f520 100644
--- a/tree.c
+++ b/tree.c
@@ -10,7 +10,7 @@
 const char *tree_type = "tree";
 
 static int read_one_entry_opt(struct index_state *istate,
-			      const unsigned char *sha1,
+			      const struct object_id *oid,
 			      const char *base, int baselen,
 			      const char *pathname,
 			      unsigned mode, int stage, int opt)
@@ -31,16 +31,16 @@ static int read_one_entry_opt(struct index_state *istate,
 	ce->ce_namelen = baselen + len;
 	memcpy(ce->name, base, baselen);
 	memcpy(ce->name + baselen, pathname, len+1);
-	hashcpy(ce->oid.hash, sha1);
+	oidcpy(&ce->oid, oid);
 	return add_index_entry(istate, ce, opt);
 }
 
-static int read_one_entry(const unsigned char *sha1, struct strbuf *base,
+static int read_one_entry(const struct object_id *oid, struct strbuf *base,
 			  const char *pathname, unsigned mode, int stage,
 			  void *context)
 {
 	struct index_state *istate = context;
-	return read_one_entry_opt(istate, sha1, base->buf, base->len, pathname,
+	return read_one_entry_opt(istate, oid, base->buf, base->len, pathname,
 				  mode, stage,
 				  ADD_CACHE_OK_TO_ADD|ADD_CACHE_SKIP_DFCHECK);
 }
@@ -49,12 +49,12 @@ static int read_one_entry(const unsigned char *sha1, struct strbuf *base,
  * This is used when the caller knows there is no existing entries at
  * the stage that will conflict with the entry being added.
  */
-static int read_one_entry_quick(const unsigned char *sha1, struct strbuf *base,
+static int read_one_entry_quick(const struct object_id *oid, struct strbuf *base,
 				const char *pathname, unsigned mode, int stage,
 				void *context)
 {
 	struct index_state *istate = context;
-	return read_one_entry_opt(istate, sha1, base->buf, base->len, pathname,
+	return read_one_entry_opt(istate, oid, base->buf, base->len, pathname,
 				  mode, stage,
 				  ADD_CACHE_JUST_APPEND);
 }
@@ -83,7 +83,7 @@ static int read_tree_1(struct tree *tree, struct strbuf *base,
 				continue;
 		}
 
-		switch (fn(entry.oid->hash, base,
+		switch (fn(entry.oid, base,
 			   entry.path, entry.mode, stage, context)) {
 		case 0:
 			continue;
diff --git a/tree.h b/tree.h
index 744e6dc2ac..e2a80be4ef 100644
--- a/tree.h
+++ b/tree.h
@@ -27,7 +27,7 @@ void free_tree_buffer(struct tree *tree);
 struct tree *parse_tree_indirect(const struct object_id *oid);
 
 #define READ_TREE_RECURSIVE 1
-typedef int (*read_tree_fn_t)(const unsigned char *, struct strbuf *, const char *, unsigned int, int, void *);
+typedef int (*read_tree_fn_t)(const struct object_id *, struct strbuf *, const char *, unsigned int, int, void *);
 
 extern int read_tree_recursive(struct tree *tree,
 			       const char *base, int baselen,

[PATCH v2 07/36] ref-filter: convert grab_objectname to struct object_id

[brian m. carlson]

This is necessary in order to convert find_unique_abbrev.

Signed-off-by: brian m. carlson <sandals@crustytoothpaste.net>
---
 ref-filter.c | 12 ++++++------
 1 file changed, 6 insertions(+), 6 deletions(-)

diff --git a/ref-filter.c b/ref-filter.c
index f9e25aea7a..9cbd92611c 100644
--- a/ref-filter.c
+++ b/ref-filter.c
@@ -737,18 +737,18 @@ static void *get_obj(const struct object_id *oid, struct object **obj, unsigned
 	return buf;
 }
 
-static int grab_objectname(const char *name, const unsigned char *sha1,
+static int grab_objectname(const char *name, const struct object_id *oid,
 			   struct atom_value *v, struct used_atom *atom)
 {
 	if (starts_with(name, "objectname")) {
 		if (atom->u.objectname.option == O_SHORT) {
-			v->s = xstrdup(find_unique_abbrev(sha1, DEFAULT_ABBREV));
+			v->s = xstrdup(find_unique_abbrev(oid->hash, DEFAULT_ABBREV));
 			return 1;
 		} else if (atom->u.objectname.option == O_FULL) {
-			v->s = xstrdup(sha1_to_hex(sha1));
+			v->s = xstrdup(oid_to_hex(oid));
 			return 1;
 		} else if (atom->u.objectname.option == O_LENGTH) {
-			v->s = xstrdup(find_unique_abbrev(sha1, atom->u.objectname.length));
+			v->s = xstrdup(find_unique_abbrev(oid->hash, atom->u.objectname.length));
 			return 1;
 		} else
 			die("BUG: unknown %%(objectname) option");
@@ -775,7 +775,7 @@ static void grab_common_values(struct atom_value *val, int deref, struct object
 			v->s = xstrfmt("%lu", sz);
 		}
 		else if (deref)
-			grab_objectname(name, obj->oid.hash, v, &used_atom[i]);
+			grab_objectname(name, &obj->oid, v, &used_atom[i]);
 	}
 }
 
@@ -1439,7 +1439,7 @@ static void populate_value(struct ref_array_item *ref)
 				v->s = xstrdup(buf + 1);
 			}
 			continue;
-		} else if (!deref && grab_objectname(name, ref->objectname.hash, v, atom)) {
+		} else if (!deref && grab_objectname(name, &ref->objectname, v, atom)) {
 			continue;
 		} else if (!strcmp(name, "HEAD")) {
 			if (atom->u.head && !strcmp(ref->refname, atom->u.head))

[PATCH v2 08/36] strbuf: convert strbuf_add_unique_abbrev to use struct object_id

[brian m. carlson]

Convert the declaration and definition of strbuf_add_unique_abbrev to
make it take a pointer to struct object_id.  Predeclare the struct in
strbuf.h, as cache.h includes strbuf.h before it declares the struct,
and otherwise the struct declaration would have the wrong scope.

Apply the following semantic patch, along with the standard object_id
transforms, to adjust the callers:

@@
expression E1, E2, E3;
@@
- strbuf_add_unique_abbrev(E1, E2.hash, E3);
+ strbuf_add_unique_abbrev(E1, &E2, E3);

@@
expression E1, E2, E3;
@@
- strbuf_add_unique_abbrev(E1, E2->hash, E3);
+ strbuf_add_unique_abbrev(E1, E2, E3);

Signed-off-by: brian m. carlson <sandals@crustytoothpaste.net>
---
 builtin/checkout.c | 2 +-
 builtin/fetch.c    | 8 ++++----
 builtin/tag.c      | 2 +-
 merge-recursive.c  | 2 +-
 pretty.c           | 8 ++++----
 strbuf.c           | 4 ++--
 strbuf.h           | 8 +++++++-
 submodule.c        | 4 ++--
 transport.c        | 4 ++--
 wt-status.c        | 6 +++---
 10 files changed, 27 insertions(+), 21 deletions(-)

diff --git a/builtin/checkout.c b/builtin/checkout.c
index 87182aa018..bc68d423e5 100644
--- a/builtin/checkout.c
+++ b/builtin/checkout.c
@@ -720,7 +720,7 @@ static int add_pending_uninteresting_ref(const char *refname,
 static void describe_one_orphan(struct strbuf *sb, struct commit *commit)
 {
 	strbuf_addstr(sb, "  ");
-	strbuf_add_unique_abbrev(sb, commit->object.oid.hash, DEFAULT_ABBREV);
+	strbuf_add_unique_abbrev(sb, &commit->object.oid, DEFAULT_ABBREV);
 	strbuf_addch(sb, ' ');
 	if (!parse_commit(commit))
 		pp_commit_easy(CMIT_FMT_ONELINE, commit, sb);
diff --git a/builtin/fetch.c b/builtin/fetch.c
index 8ee998ea2e..3b8988e51d 100644
--- a/builtin/fetch.c
+++ b/builtin/fetch.c
@@ -697,9 +697,9 @@ static int update_local_ref(struct ref *ref,
 	if (in_merge_bases(current, updated)) {
 		struct strbuf quickref = STRBUF_INIT;
 		int r;
-		strbuf_add_unique_abbrev(&quickref, current->object.oid.hash, DEFAULT_ABBREV);
+		strbuf_add_unique_abbrev(&quickref, &current->object.oid, DEFAULT_ABBREV);
 		strbuf_addstr(&quickref, "..");
-		strbuf_add_unique_abbrev(&quickref, ref->new_oid.hash, DEFAULT_ABBREV);
+		strbuf_add_unique_abbrev(&quickref, &ref->new_oid, DEFAULT_ABBREV);
 		if ((recurse_submodules != RECURSE_SUBMODULES_OFF) &&
 		    (recurse_submodules != RECURSE_SUBMODULES_ON))
 			check_for_new_submodule_commits(&ref->new_oid);
@@ -712,9 +712,9 @@ static int update_local_ref(struct ref *ref,
 	} else if (force || ref->force) {
 		struct strbuf quickref = STRBUF_INIT;
 		int r;
-		strbuf_add_unique_abbrev(&quickref, current->object.oid.hash, DEFAULT_ABBREV);
+		strbuf_add_unique_abbrev(&quickref, &current->object.oid, DEFAULT_ABBREV);
 		strbuf_addstr(&quickref, "...");
-		strbuf_add_unique_abbrev(&quickref, ref->new_oid.hash, DEFAULT_ABBREV);
+		strbuf_add_unique_abbrev(&quickref, &ref->new_oid, DEFAULT_ABBREV);
 		if ((recurse_submodules != RECURSE_SUBMODULES_OFF) &&
 		    (recurse_submodules != RECURSE_SUBMODULES_ON))
 			check_for_new_submodule_commits(&ref->new_oid);
diff --git a/builtin/tag.c b/builtin/tag.c
index 8885e21ddc..99dba2d907 100644
--- a/builtin/tag.c
+++ b/builtin/tag.c
@@ -289,7 +289,7 @@ static void create_reflog_msg(const struct object_id *oid, struct strbuf *sb)
 		strbuf_addstr(sb, rla);
 	} else {
 		strbuf_addstr(sb, "tag: tagging ");
-		strbuf_add_unique_abbrev(sb, oid->hash, DEFAULT_ABBREV);
+		strbuf_add_unique_abbrev(sb, oid, DEFAULT_ABBREV);
 	}
 
 	strbuf_addstr(sb, " (");
diff --git a/merge-recursive.c b/merge-recursive.c
index c886f2e9cd..f58f13957e 100644
--- a/merge-recursive.c
+++ b/merge-recursive.c
@@ -228,7 +228,7 @@ static void output_commit_title(struct merge_options *o, struct commit *commit)
 		strbuf_addf(&o->obuf, "virtual %s\n",
 			merge_remote_util(commit)->name);
 	else {
-		strbuf_add_unique_abbrev(&o->obuf, commit->object.oid.hash,
+		strbuf_add_unique_abbrev(&o->obuf, &commit->object.oid,
 					 DEFAULT_ABBREV);
 		strbuf_addch(&o->obuf, ' ');
 		if (parse_commit(commit) != 0)
diff --git a/pretty.c b/pretty.c
index f7ce490230..34fe891fc0 100644
--- a/pretty.c
+++ b/pretty.c
@@ -549,7 +549,7 @@ static void add_merge_info(const struct pretty_print_context *pp,
 		struct object_id *oidp = &parent->item->object.oid;
 		strbuf_addch(sb, ' ');
 		if (pp->abbrev)
-			strbuf_add_unique_abbrev(sb, oidp->hash, pp->abbrev);
+			strbuf_add_unique_abbrev(sb, oidp, pp->abbrev);
 		else
 			strbuf_addstr(sb, oid_to_hex(oidp));
 		parent = parent->next;
@@ -1156,7 +1156,7 @@ static size_t format_commit_one(struct strbuf *sb, /* in UTF-8 */
 		return 1;
 	case 'h':		/* abbreviated commit hash */
 		strbuf_addstr(sb, diff_get_color(c->auto_color, DIFF_COMMIT));
-		strbuf_add_unique_abbrev(sb, commit->object.oid.hash,
+		strbuf_add_unique_abbrev(sb, &commit->object.oid,
 					 c->pretty_ctx->abbrev);
 		strbuf_addstr(sb, diff_get_color(c->auto_color, DIFF_RESET));
 		return 1;
@@ -1164,7 +1164,7 @@ static size_t format_commit_one(struct strbuf *sb, /* in UTF-8 */
 		strbuf_addstr(sb, oid_to_hex(&commit->tree->object.oid));
 		return 1;
 	case 't':		/* abbreviated tree hash */
-		strbuf_add_unique_abbrev(sb, commit->tree->object.oid.hash,
+		strbuf_add_unique_abbrev(sb, &commit->tree->object.oid,
 					 c->pretty_ctx->abbrev);
 		return 1;
 	case 'P':		/* parent hashes */
@@ -1178,7 +1178,7 @@ static size_t format_commit_one(struct strbuf *sb, /* in UTF-8 */
 		for (p = commit->parents; p; p = p->next) {
 			if (p != commit->parents)
 				strbuf_addch(sb, ' ');
-			strbuf_add_unique_abbrev(sb, p->item->object.oid.hash,
+			strbuf_add_unique_abbrev(sb, &p->item->object.oid,
 						 c->pretty_ctx->abbrev);
 		}
 		return 1;
diff --git a/strbuf.c b/strbuf.c
index 1df674e919..128fbec503 100644
--- a/strbuf.c
+++ b/strbuf.c
@@ -869,12 +869,12 @@ void strbuf_addftime(struct strbuf *sb, const char *fmt, const struct tm *tm,
 	strbuf_setlen(sb, sb->len + len);
 }
 
-void strbuf_add_unique_abbrev(struct strbuf *sb, const unsigned char *sha1,
+void strbuf_add_unique_abbrev(struct strbuf *sb, const struct object_id *oid,
 			      int abbrev_len)
 {
 	int r;
 	strbuf_grow(sb, GIT_SHA1_HEXSZ + 1);
-	r = find_unique_abbrev_r(sb->buf + sb->len, sha1, abbrev_len);
+	r = find_unique_abbrev_r(sb->buf + sb->len, oid->hash, abbrev_len);
 	strbuf_setlen(sb, sb->len + r);
 }
 
diff --git a/strbuf.h b/strbuf.h
index 14c8c10d66..cd7ad898eb 100644
--- a/strbuf.h
+++ b/strbuf.h
@@ -70,6 +70,12 @@ struct strbuf {
 extern char strbuf_slopbuf[];
 #define STRBUF_INIT  { .alloc = 0, .len = 0, .buf = strbuf_slopbuf }
 
+/*
+ * Predeclare this here, since cache.h includes this file before it defines the
+ * struct.
+ */
+struct object_id;
+
 /**
  * Life Cycle Functions
  * --------------------
@@ -539,7 +545,7 @@ extern void strbuf_list_free(struct strbuf **);
  * the strbuf `sb`.
  */
 extern void strbuf_add_unique_abbrev(struct strbuf *sb,
-				     const unsigned char *sha1,
+				     const struct object_id *oid,
 				     int abbrev_len);
 
 /**
diff --git a/submodule.c b/submodule.c
index 47ddc9b273..d4a482e647 100644
--- a/submodule.c
+++ b/submodule.c
@@ -540,9 +540,9 @@ static void show_submodule_header(struct diff_options *o, const char *path,
 
 output_header:
 	strbuf_addf(&sb, "Submodule %s ", path);
-	strbuf_add_unique_abbrev(&sb, one->hash, DEFAULT_ABBREV);
+	strbuf_add_unique_abbrev(&sb, one, DEFAULT_ABBREV);
 	strbuf_addstr(&sb, (fast_backward || fast_forward) ? ".." : "...");
-	strbuf_add_unique_abbrev(&sb, two->hash, DEFAULT_ABBREV);
+	strbuf_add_unique_abbrev(&sb, two, DEFAULT_ABBREV);
 	if (message)
 		strbuf_addf(&sb, " %s\n", message);
 	else
diff --git a/transport.c b/transport.c
index 00d48b5b56..87de35dd5e 100644
--- a/transport.c
+++ b/transport.c
@@ -367,7 +367,7 @@ static void print_ok_ref_status(struct ref *ref, int porcelain, int summary_widt
 		char type;
 		const char *msg;
 
-		strbuf_add_unique_abbrev(&quickref, ref->old_oid.hash,
+		strbuf_add_unique_abbrev(&quickref, &ref->old_oid,
 					 DEFAULT_ABBREV);
 		if (ref->forced_update) {
 			strbuf_addstr(&quickref, "...");
@@ -378,7 +378,7 @@ static void print_ok_ref_status(struct ref *ref, int porcelain, int summary_widt
 			type = ' ';
 			msg = NULL;
 		}
-		strbuf_add_unique_abbrev(&quickref, ref->new_oid.hash,
+		strbuf_add_unique_abbrev(&quickref, &ref->new_oid,
 					 DEFAULT_ABBREV);
 
 		print_ref_status(type, quickref.buf, ref, ref->peer_ref, msg,
diff --git a/wt-status.c b/wt-status.c
index f5debcd2b4..98e558a70b 100644
--- a/wt-status.c
+++ b/wt-status.c
@@ -1187,7 +1187,7 @@ static void abbrev_sha1_in_line(struct strbuf *line)
 		strbuf_trim(split[1]);
 		if (!get_oid(split[1]->buf, &oid)) {
 			strbuf_reset(split[1]);
-			strbuf_add_unique_abbrev(split[1], oid.hash,
+			strbuf_add_unique_abbrev(split[1], &oid,
 						 DEFAULT_ABBREV);
 			strbuf_addch(split[1], ' ');
 			strbuf_reset(line);
@@ -1421,7 +1421,7 @@ static char *get_branch(const struct worktree *wt, const char *path)
 		;
 	else if (!get_oid_hex(sb.buf, &oid)) {
 		strbuf_reset(&sb);
-		strbuf_add_unique_abbrev(&sb, oid.hash, DEFAULT_ABBREV);
+		strbuf_add_unique_abbrev(&sb, &oid, DEFAULT_ABBREV);
 	} else if (!strcmp(sb.buf, "detached HEAD")) /* rebase */
 		goto got_nothing;
 	else			/* bisect */
@@ -1458,7 +1458,7 @@ static int grab_1st_switch(struct object_id *ooid, struct object_id *noid,
 	if (!strcmp(cb->buf.buf, "HEAD")) {
 		/* HEAD is relative. Resolve it to the right reflog entry. */
 		strbuf_reset(&cb->buf);
-		strbuf_add_unique_abbrev(&cb->buf, noid->hash, DEFAULT_ABBREV);
+		strbuf_add_unique_abbrev(&cb->buf, noid, DEFAULT_ABBREV);
 	}
 	return 1;
 }

[PATCH v2 09/36] wt-status: convert struct wt_status_state to object_id

[brian m. carlson]

Convert the various *_sha1 members to use struct object_id instead.

Signed-off-by: brian m. carlson <sandals@crustytoothpaste.net>
---
 wt-status.c | 12 ++++++------
 wt-status.h |  6 +++---
 2 files changed, 9 insertions(+), 9 deletions(-)

diff --git a/wt-status.c b/wt-status.c
index 98e558a70b..698fa1d42a 100644
--- a/wt-status.c
+++ b/wt-status.c
@@ -1349,7 +1349,7 @@ static void show_cherry_pick_in_progress(struct wt_status *s,
 					const char *color)
 {
 	status_printf_ln(s, color, _("You are currently cherry-picking commit %s."),
-			find_unique_abbrev(state->cherry_pick_head_sha1, DEFAULT_ABBREV));
+			find_unique_abbrev(state->cherry_pick_head_oid.hash, DEFAULT_ABBREV));
 	if (s->hints) {
 		if (has_unmerged(s))
 			status_printf_ln(s, color,
@@ -1368,7 +1368,7 @@ static void show_revert_in_progress(struct wt_status *s,
 					const char *color)
 {
 	status_printf_ln(s, color, _("You are currently reverting commit %s."),
-			 find_unique_abbrev(state->revert_head_sha1, DEFAULT_ABBREV));
+			 find_unique_abbrev(state->revert_head_oid.hash, DEFAULT_ABBREV));
 	if (s->hints) {
 		if (has_unmerged(s))
 			status_printf_ln(s, color,
@@ -1489,9 +1489,9 @@ static void wt_status_get_detached_from(struct wt_status_state *state)
 	} else
 		state->detached_from =
 			xstrdup(find_unique_abbrev(cb.noid.hash, DEFAULT_ABBREV));
-	hashcpy(state->detached_sha1, cb.noid.hash);
+	oidcpy(&state->detached_oid, &cb.noid);
 	state->detached_at = !get_oid("HEAD", &oid) &&
-			     !hashcmp(oid.hash, state->detached_sha1);
+			     !oidcmp(&oid, &state->detached_oid);
 
 	free(ref);
 	strbuf_release(&cb.buf);
@@ -1550,13 +1550,13 @@ void wt_status_get_state(struct wt_status_state *state,
 	} else if (!stat(git_path_cherry_pick_head(), &st) &&
 			!get_oid("CHERRY_PICK_HEAD", &oid)) {
 		state->cherry_pick_in_progress = 1;
-		hashcpy(state->cherry_pick_head_sha1, oid.hash);
+		oidcpy(&state->cherry_pick_head_oid, &oid);
 	}
 	wt_status_check_bisect(NULL, state);
 	if (!stat(git_path_revert_head(), &st) &&
 	    !get_oid("REVERT_HEAD", &oid)) {
 		state->revert_in_progress = 1;
-		hashcpy(state->revert_head_sha1, oid.hash);
+		oidcpy(&state->revert_head_oid, &oid);
 	}
 
 	if (get_detached_from)
diff --git a/wt-status.h b/wt-status.h
index 3f84d5c29f..c7ef173284 100644
--- a/wt-status.h
+++ b/wt-status.h
@@ -116,9 +116,9 @@ struct wt_status_state {
 	char *branch;
 	char *onto;
 	char *detached_from;
-	unsigned char detached_sha1[20];
-	unsigned char revert_head_sha1[20];
-	unsigned char cherry_pick_head_sha1[20];
+	struct object_id detached_oid;
+	struct object_id revert_head_oid;
+	struct object_id cherry_pick_head_oid;
 };
 
 size_t wt_status_locate_end(const char *s, size_t len);

[PATCH v2 10/36] Convert find_unique_abbrev* to struct object_id

[brian m. carlson]

Convert find_unique_abbrev and find_unique_abbrev_r to each take a
pointer to struct object_id.

Signed-off-by: brian m. carlson <sandals@crustytoothpaste.net>
---
 builtin/blame.c        |  2 +-
 builtin/branch.c       |  2 +-
 builtin/checkout.c     |  6 +++---
 builtin/describe.c     |  4 ++--
 builtin/log.c          |  4 ++--
 builtin/ls-files.c     |  4 ++--
 builtin/ls-tree.c      |  4 ++--
 builtin/merge.c        |  6 +++---
 builtin/name-rev.c     |  2 +-
 builtin/receive-pack.c |  8 ++++----
 builtin/reset.c        |  2 +-
 builtin/rev-list.c     |  2 +-
 builtin/rev-parse.c    |  2 +-
 builtin/show-branch.c  |  2 +-
 builtin/show-ref.c     |  4 ++--
 builtin/tag.c          |  6 ++++--
 builtin/worktree.c     |  4 ++--
 cache.h                |  6 +++---
 combine-diff.c         |  4 ++--
 diff.c                 |  2 +-
 log-tree.c             | 12 ++++++------
 ref-filter.c           |  4 ++--
 sequencer.c            |  2 +-
 sha1_name.c            | 12 ++++++------
 strbuf.c               |  2 +-
 tag.c                  |  4 ++--
 transport.c            |  2 +-
 wt-status.c            |  6 +++---
 28 files changed, 61 insertions(+), 59 deletions(-)

diff --git a/builtin/blame.c b/builtin/blame.c
index 005f55aaa2..21b496517a 100644
--- a/builtin/blame.c
+++ b/builtin/blame.c
@@ -499,7 +499,7 @@ static int read_ancestry(const char *graft_file)
 
 static int update_auto_abbrev(int auto_abbrev, struct blame_origin *suspect)
 {
-	const char *uniq = find_unique_abbrev(suspect->commit->object.oid.hash,
+	const char *uniq = find_unique_abbrev(&suspect->commit->object.oid,
 					      auto_abbrev);
 	int len = strlen(uniq);
 	if (auto_abbrev < len)
diff --git a/builtin/branch.c b/builtin/branch.c
index 8dcc2ed058..659deb36f3 100644
--- a/builtin/branch.c
+++ b/builtin/branch.c
@@ -273,7 +273,7 @@ static int delete_branches(int argc, const char **argv, int force, int kinds,
 			       bname.buf,
 			       (flags & REF_ISBROKEN) ? "broken"
 			       : (flags & REF_ISSYMREF) ? target
-			       : find_unique_abbrev(oid.hash, DEFAULT_ABBREV));
+			       : find_unique_abbrev(&oid, DEFAULT_ABBREV));
 		}
 		delete_branch_config(bname.buf);
 
diff --git a/builtin/checkout.c b/builtin/checkout.c
index bc68d423e5..e6ee955671 100644
--- a/builtin/checkout.c
+++ b/builtin/checkout.c
@@ -405,10 +405,10 @@ static void describe_detached_head(const char *msg, struct commit *commit)
 		pp_commit_easy(CMIT_FMT_ONELINE, commit, &sb);
 	if (print_sha1_ellipsis()) {
 		fprintf(stderr, "%s %s... %s\n", msg,
-			find_unique_abbrev(commit->object.oid.hash, DEFAULT_ABBREV), sb.buf);
+			find_unique_abbrev(&commit->object.oid, DEFAULT_ABBREV), sb.buf);
 	} else {
 		fprintf(stderr, "%s %s %s\n", msg,
-			find_unique_abbrev(commit->object.oid.hash, DEFAULT_ABBREV), sb.buf);
+			find_unique_abbrev(&commit->object.oid, DEFAULT_ABBREV), sb.buf);
 	}
 	strbuf_release(&sb);
 }
@@ -778,7 +778,7 @@ static void suggest_reattach(struct commit *commit, struct rev_info *revs)
 			" git branch <new-branch-name> %s\n\n",
 			/* Give ngettext() the count */
 			lost),
-			find_unique_abbrev(commit->object.oid.hash, DEFAULT_ABBREV));
+			find_unique_abbrev(&commit->object.oid, DEFAULT_ABBREV));
 }
 
 /*
diff --git a/builtin/describe.c b/builtin/describe.c
index c428984706..dc5c3aa9f9 100644
--- a/builtin/describe.c
+++ b/builtin/describe.c
@@ -285,7 +285,7 @@ static void append_name(struct commit_name *n, struct strbuf *dst)
 
 static void append_suffix(int depth, const struct object_id *oid, struct strbuf *dst)
 {
-	strbuf_addf(dst, "-%d-g%s", depth, find_unique_abbrev(oid->hash, abbrev));
+	strbuf_addf(dst, "-%d-g%s", depth, find_unique_abbrev(oid, abbrev));
 }
 
 static void describe_commit(struct object_id *oid, struct strbuf *dst)
@@ -383,7 +383,7 @@ static void describe_commit(struct object_id *oid, struct strbuf *dst)
 	if (!match_cnt) {
 		struct object_id *cmit_oid = &cmit->object.oid;
 		if (always) {
-			strbuf_add_unique_abbrev(dst, cmit_oid->hash, abbrev);
+			strbuf_add_unique_abbrev(dst, cmit_oid, abbrev);
 			if (suffix)
 				strbuf_addstr(dst, suffix);
 			return;
diff --git a/builtin/log.c b/builtin/log.c
index 32a744bfd2..411339c1ed 100644
--- a/builtin/log.c
+++ b/builtin/log.c
@@ -1873,12 +1873,12 @@ static void print_commit(char sign, struct commit *commit, int verbose,
 {
 	if (!verbose) {
 		fprintf(file, "%c %s\n", sign,
-		       find_unique_abbrev(commit->object.oid.hash, abbrev));
+		       find_unique_abbrev(&commit->object.oid, abbrev));
 	} else {
 		struct strbuf buf = STRBUF_INIT;
 		pp_commit_easy(CMIT_FMT_ONELINE, commit, &buf);
 		fprintf(file, "%c %s %s\n", sign,
-		       find_unique_abbrev(commit->object.oid.hash, abbrev),
+		       find_unique_abbrev(&commit->object.oid, abbrev),
 		       buf.buf);
 		strbuf_release(&buf);
 	}
diff --git a/builtin/ls-files.c b/builtin/ls-files.c
index 9df66ba307..a71f6bd088 100644
--- a/builtin/ls-files.c
+++ b/builtin/ls-files.c
@@ -240,7 +240,7 @@ static void show_ce(struct repository *repo, struct dir_struct *dir,
 			printf("%s%06o %s %d\t",
 			       tag,
 			       ce->ce_mode,
-			       find_unique_abbrev(ce->oid.hash, abbrev),
+			       find_unique_abbrev(&ce->oid, abbrev),
 			       ce_stage(ce));
 		}
 		write_eolinfo(repo->index, ce, fullname);
@@ -271,7 +271,7 @@ static void show_ru_info(const struct index_state *istate)
 			if (!ui->mode[i])
 				continue;
 			printf("%s%06o %s %d\t", tag_resolve_undo, ui->mode[i],
-			       find_unique_abbrev(ui->oid[i].hash, abbrev),
+			       find_unique_abbrev(&ui->oid[i], abbrev),
 			       i + 1);
 			write_name(path);
 		}
diff --git a/builtin/ls-tree.c b/builtin/ls-tree.c
index c613dd7b82..c98253adbb 100644
--- a/builtin/ls-tree.c
+++ b/builtin/ls-tree.c
@@ -103,11 +103,11 @@ static int show_tree(const struct object_id *oid, struct strbuf *base,
 			} else
 				xsnprintf(size_text, sizeof(size_text), "-");
 			printf("%06o %s %s %7s\t", mode, type,
-			       find_unique_abbrev(oid->hash, abbrev),
+			       find_unique_abbrev(oid, abbrev),
 			       size_text);
 		} else
 			printf("%06o %s %s\t", mode, type,
-			       find_unique_abbrev(oid->hash, abbrev));
+			       find_unique_abbrev(oid, abbrev));
 	}
 	baselen = base->len;
 	strbuf_addstr(base, pathname);
diff --git a/builtin/merge.c b/builtin/merge.c
index 861b170468..66cdaa5e0b 100644
--- a/builtin/merge.c
+++ b/builtin/merge.c
@@ -1289,7 +1289,7 @@ int cmd_merge(int argc, const char **argv, const char *prefix)
 
 			check_commit_signature(commit, &signature_check);
 
-			find_unique_abbrev_r(hex, commit->object.oid.hash, DEFAULT_ABBREV);
+			find_unique_abbrev_r(hex, &commit->object.oid, DEFAULT_ABBREV);
 			switch (signature_check.result) {
 			case 'G':
 				break;
@@ -1385,9 +1385,9 @@ int cmd_merge(int argc, const char **argv, const char *prefix)
 
 		if (verbosity >= 0) {
 			printf(_("Updating %s..%s\n"),
-			       find_unique_abbrev(head_commit->object.oid.hash,
+			       find_unique_abbrev(&head_commit->object.oid,
 						  DEFAULT_ABBREV),
-			       find_unique_abbrev(remoteheads->item->object.oid.hash,
+			       find_unique_abbrev(&remoteheads->item->object.oid,
 						  DEFAULT_ABBREV));
 		}
 		strbuf_addstr(&msg, "Fast-forward");
diff --git a/builtin/name-rev.c b/builtin/name-rev.c
index 9e088ebd11..387ddf85d2 100644
--- a/builtin/name-rev.c
+++ b/builtin/name-rev.c
@@ -328,7 +328,7 @@ static void show_name(const struct object *obj,
 	else if (allow_undefined)
 		printf("undefined\n");
 	else if (always)
-		printf("%s\n", find_unique_abbrev(oid->hash, DEFAULT_ABBREV));
+		printf("%s\n", find_unique_abbrev(oid, DEFAULT_ABBREV));
 	else
 		die("cannot describe '%s'", oid_to_hex(oid));
 	strbuf_release(&buf);
diff --git a/builtin/receive-pack.c b/builtin/receive-pack.c
index 75e7f18ace..2bf7f2d1a3 100644
--- a/builtin/receive-pack.c
+++ b/builtin/receive-pack.c
@@ -1242,11 +1242,11 @@ static void check_aliased_update(struct command *cmd, struct string_list *list)
 	rp_error("refusing inconsistent update between symref '%s' (%s..%s) and"
 		 " its target '%s' (%s..%s)",
 		 cmd->ref_name,
-		 find_unique_abbrev(cmd->old_oid.hash, DEFAULT_ABBREV),
-		 find_unique_abbrev(cmd->new_oid.hash, DEFAULT_ABBREV),
+		 find_unique_abbrev(&cmd->old_oid, DEFAULT_ABBREV),
+		 find_unique_abbrev(&cmd->new_oid, DEFAULT_ABBREV),
 		 dst_cmd->ref_name,
-		 find_unique_abbrev(dst_cmd->old_oid.hash, DEFAULT_ABBREV),
-		 find_unique_abbrev(dst_cmd->new_oid.hash, DEFAULT_ABBREV));
+		 find_unique_abbrev(&dst_cmd->old_oid, DEFAULT_ABBREV),
+		 find_unique_abbrev(&dst_cmd->new_oid, DEFAULT_ABBREV));
 
 	cmd->error_string = dst_cmd->error_string =
 		"inconsistent aliased update";
diff --git a/builtin/reset.c b/builtin/reset.c
index 5da0f75de9..7f1c3f02a3 100644
--- a/builtin/reset.c
+++ b/builtin/reset.c
@@ -109,7 +109,7 @@ static void print_new_head_line(struct commit *commit)
 	struct strbuf buf = STRBUF_INIT;
 
 	printf(_("HEAD is now at %s"),
-		find_unique_abbrev(commit->object.oid.hash, DEFAULT_ABBREV));
+		find_unique_abbrev(&commit->object.oid, DEFAULT_ABBREV));
 
 	pp_commit_easy(CMIT_FMT_ONELINE, commit, &buf);
 	if (buf.len > 0)
diff --git a/builtin/rev-list.c b/builtin/rev-list.c
index 48300d9e11..71afab5388 100644
--- a/builtin/rev-list.c
+++ b/builtin/rev-list.c
@@ -108,7 +108,7 @@ static void show_commit(struct commit *commit, void *data)
 	if (!revs->graph)
 		fputs(get_revision_mark(revs, commit), stdout);
 	if (revs->abbrev_commit && revs->abbrev)
-		fputs(find_unique_abbrev(commit->object.oid.hash, revs->abbrev),
+		fputs(find_unique_abbrev(&commit->object.oid, revs->abbrev),
 		      stdout);
 	else
 		fputs(oid_to_hex(&commit->object.oid), stdout);
diff --git a/builtin/rev-parse.c b/builtin/rev-parse.c
index 96d06a5d01..fd16f9fad8 100644
--- a/builtin/rev-parse.c
+++ b/builtin/rev-parse.c
@@ -159,7 +159,7 @@ static void show_rev(int type, const struct object_id *oid, const char *name)
 		}
 	}
 	else if (abbrev)
-		show_with_type(type, find_unique_abbrev(oid->hash, abbrev));
+		show_with_type(type, find_unique_abbrev(oid, abbrev));
 	else
 		show_with_type(type, oid_to_hex(oid));
 }
diff --git a/builtin/show-branch.c b/builtin/show-branch.c
index e8a4aa40cb..6c2148b71d 100644
--- a/builtin/show-branch.c
+++ b/builtin/show-branch.c
@@ -292,7 +292,7 @@ static void show_one_commit(struct commit *commit, int no_name)
 		}
 		else
 			printf("[%s] ",
-			       find_unique_abbrev(commit->object.oid.hash,
+			       find_unique_abbrev(&commit->object.oid,
 						  DEFAULT_ABBREV));
 	}
 	puts(pretty_str);
diff --git a/builtin/show-ref.c b/builtin/show-ref.c
index 41e5e71cad..f2eb1a7724 100644
--- a/builtin/show-ref.c
+++ b/builtin/show-ref.c
@@ -29,7 +29,7 @@ static void show_one(const char *refname, const struct object_id *oid)
 	if (quiet)
 		return;
 
-	hex = find_unique_abbrev(oid->hash, abbrev);
+	hex = find_unique_abbrev(oid, abbrev);
 	if (hash_only)
 		printf("%s\n", hex);
 	else
@@ -39,7 +39,7 @@ static void show_one(const char *refname, const struct object_id *oid)
 		return;
 
 	if (!peel_ref(refname, &peeled)) {
-		hex = find_unique_abbrev(peeled.hash, abbrev);
+		hex = find_unique_abbrev(&peeled, abbrev);
 		printf("%s %s^{}\n", hex, refname);
 	}
 }
diff --git a/builtin/tag.c b/builtin/tag.c
index 99dba2d907..17d6bc0836 100644
--- a/builtin/tag.c
+++ b/builtin/tag.c
@@ -99,7 +99,8 @@ static int delete_tag(const char *name, const char *ref,
 {
 	if (delete_ref(NULL, ref, oid, 0))
 		return 1;
-	printf(_("Deleted tag '%s' (was %s)\n"), name, find_unique_abbrev(oid->hash, DEFAULT_ABBREV));
+	printf(_("Deleted tag '%s' (was %s)\n"), name,
+	       find_unique_abbrev(oid, DEFAULT_ABBREV));
 	return 0;
 }
 
@@ -551,7 +552,8 @@ int cmd_tag(int argc, const char **argv, const char *prefix)
 		die("%s", err.buf);
 	ref_transaction_free(transaction);
 	if (force && !is_null_oid(&prev) && oidcmp(&prev, &object))
-		printf(_("Updated tag '%s' (was %s)\n"), tag, find_unique_abbrev(prev.hash, DEFAULT_ABBREV));
+		printf(_("Updated tag '%s' (was %s)\n"), tag,
+		       find_unique_abbrev(&prev, DEFAULT_ABBREV));
 
 	UNLEAK(buf);
 	UNLEAK(ref);
diff --git a/builtin/worktree.c b/builtin/worktree.c
index 9efdc22466..dba1f90111 100644
--- a/builtin/worktree.c
+++ b/builtin/worktree.c
@@ -484,7 +484,7 @@ static void show_worktree(struct worktree *wt, int path_maxlen, int abbrev_len)
 		strbuf_addstr(&sb, "(bare)");
 	else {
 		strbuf_addf(&sb, "%-*s ", abbrev_len,
-				find_unique_abbrev(wt->head_oid.hash, DEFAULT_ABBREV));
+				find_unique_abbrev(&wt->head_oid, DEFAULT_ABBREV));
 		if (wt->is_detached)
 			strbuf_addstr(&sb, "(detached HEAD)");
 		else if (wt->head_ref) {
@@ -509,7 +509,7 @@ static void measure_widths(struct worktree **wt, int *abbrev, int *maxlen)
 
 		if (path_len > *maxlen)
 			*maxlen = path_len;
-		sha1_len = strlen(find_unique_abbrev(wt[i]->head_oid.hash, *abbrev));
+		sha1_len = strlen(find_unique_abbrev(&wt[i]->head_oid, *abbrev));
 		if (sha1_len > *abbrev)
 			*abbrev = sha1_len;
 	}
diff --git a/cache.h b/cache.h
index 21fbcc2414..09cd994bcc 100644
--- a/cache.h
+++ b/cache.h
@@ -951,14 +951,14 @@ extern void sha1_file_name(struct strbuf *buf, const unsigned char *sha1);
  * more calls to find_unique_abbrev are made.
  *
  * The `_r` variant writes to a buffer supplied by the caller, which must be at
- * least `GIT_SHA1_HEXSZ + 1` bytes. The return value is the number of bytes
+ * least `GIT_MAX_HEXSZ + 1` bytes. The return value is the number of bytes
  * written (excluding the NUL terminator).
  *
  * Note that while this version avoids the static buffer, it is not fully
  * reentrant, as it calls into other non-reentrant git code.
  */
-extern const char *find_unique_abbrev(const unsigned char *sha1, int len);
-extern int find_unique_abbrev_r(char *hex, const unsigned char *sha1, int len);
+extern const char *find_unique_abbrev(const struct object_id *oid, int len);
+extern int find_unique_abbrev_r(char *hex, const struct object_id *oid, int len);
 
 extern const unsigned char null_sha1[GIT_MAX_RAWSZ];
 extern const struct object_id null_oid;
diff --git a/combine-diff.c b/combine-diff.c
index 18c74dad51..3d86304c5a 100644
--- a/combine-diff.c
+++ b/combine-diff.c
@@ -915,11 +915,11 @@ static void show_combined_header(struct combine_diff_path *elem,
 			 "", elem->path, line_prefix, c_meta, c_reset);
 	printf("%s%sindex ", line_prefix, c_meta);
 	for (i = 0; i < num_parent; i++) {
-		abb = find_unique_abbrev(elem->parent[i].oid.hash,
+		abb = find_unique_abbrev(&elem->parent[i].oid,
 					 abbrev);
 		printf("%s%s", i ? "," : "", abb);
 	}
-	abb = find_unique_abbrev(elem->oid.hash, abbrev);
+	abb = find_unique_abbrev(&elem->oid, abbrev);
 	printf("..%s%s\n", abb, c_reset);
 
 	if (mode_differs) {
diff --git a/diff.c b/diff.c
index 21c3838b25..94117bcbbf 100644
--- a/diff.c
+++ b/diff.c
@@ -3811,7 +3811,7 @@ static int similarity_index(struct diff_filepair *p)
 static const char *diff_abbrev_oid(const struct object_id *oid, int abbrev)
 {
 	if (startup_info->have_repository)
-		return find_unique_abbrev(oid->hash, abbrev);
+		return find_unique_abbrev(oid, abbrev);
 	else {
 		char *hex = oid_to_hex(oid);
 		if (abbrev < 0)
diff --git a/log-tree.c b/log-tree.c
index fc0cc0d6d1..8bd398b18d 100644
--- a/log-tree.c
+++ b/log-tree.c
@@ -177,7 +177,7 @@ static void show_parents(struct commit *commit, int abbrev, FILE *file)
 	struct commit_list *p;
 	for (p = commit->parents; p ; p = p->next) {
 		struct commit *parent = p->item;
-		fprintf(file, " %s", find_unique_abbrev(parent->object.oid.hash, abbrev));
+		fprintf(file, " %s", find_unique_abbrev(&parent->object.oid, abbrev));
 	}
 }
 
@@ -185,7 +185,7 @@ static void show_children(struct rev_info *opt, struct commit *commit, int abbre
 {
 	struct commit_list *p = lookup_decoration(&opt->children, &commit->object);
 	for ( ; p; p = p->next) {
-		fprintf(opt->diffopt.file, " %s", find_unique_abbrev(p->item->object.oid.hash, abbrev));
+		fprintf(opt->diffopt.file, " %s", find_unique_abbrev(&p->item->object.oid, abbrev));
 	}
 }
 
@@ -558,7 +558,7 @@ void show_log(struct rev_info *opt)
 
 		if (!opt->graph)
 			put_revision_mark(opt, commit);
-		fputs(find_unique_abbrev(commit->object.oid.hash, abbrev_commit), opt->diffopt.file);
+		fputs(find_unique_abbrev(&commit->object.oid, abbrev_commit), opt->diffopt.file);
 		if (opt->print_parents)
 			show_parents(commit, abbrev_commit, opt->diffopt.file);
 		if (opt->children.name)
@@ -620,7 +620,8 @@ void show_log(struct rev_info *opt)
 
 		if (!opt->graph)
 			put_revision_mark(opt, commit);
-		fputs(find_unique_abbrev(commit->object.oid.hash, abbrev_commit),
+		fputs(find_unique_abbrev(&commit->object.oid,
+					 abbrev_commit),
 		      opt->diffopt.file);
 		if (opt->print_parents)
 			show_parents(commit, abbrev_commit, opt->diffopt.file);
@@ -628,8 +629,7 @@ void show_log(struct rev_info *opt)
 			show_children(opt, commit, abbrev_commit);
 		if (parent)
 			fprintf(opt->diffopt.file, " (from %s)",
-			       find_unique_abbrev(parent->object.oid.hash,
-						  abbrev_commit));
+			       find_unique_abbrev(&parent->object.oid, abbrev_commit));
 		fputs(diff_get_color_opt(&opt->diffopt, DIFF_RESET), opt->diffopt.file);
 		show_decorations(opt, commit);
 		if (opt->commit_format == CMIT_FMT_ONELINE) {
diff --git a/ref-filter.c b/ref-filter.c
index 9cbd92611c..62834f7153 100644
--- a/ref-filter.c
+++ b/ref-filter.c
@@ -742,13 +742,13 @@ static int grab_objectname(const char *name, const struct object_id *oid,
 {
 	if (starts_with(name, "objectname")) {
 		if (atom->u.objectname.option == O_SHORT) {
-			v->s = xstrdup(find_unique_abbrev(oid->hash, DEFAULT_ABBREV));
+			v->s = xstrdup(find_unique_abbrev(oid, DEFAULT_ABBREV));
 			return 1;
 		} else if (atom->u.objectname.option == O_FULL) {
 			v->s = xstrdup(oid_to_hex(oid));
 			return 1;
 		} else if (atom->u.objectname.option == O_LENGTH) {
-			v->s = xstrdup(find_unique_abbrev(oid->hash, atom->u.objectname.length));
+			v->s = xstrdup(find_unique_abbrev(oid, atom->u.objectname.length));
 			return 1;
 		} else
 			die("BUG: unknown %%(objectname) option");
diff --git a/sequencer.c b/sequencer.c
index d2fc1871ed..ed7c42ba7d 100644
--- a/sequencer.c
+++ b/sequencer.c
@@ -282,7 +282,7 @@ struct commit_message {
 
 static const char *short_commit_name(struct commit *commit)
 {
-	return find_unique_abbrev(commit->object.oid.hash, DEFAULT_ABBREV);
+	return find_unique_abbrev(&commit->object.oid, DEFAULT_ABBREV);
 }
 
 static int get_message(struct commit *commit, struct commit_message *out)
diff --git a/sha1_name.c b/sha1_name.c
index 611c7d24dd..dd68e68f45 100644
--- a/sha1_name.c
+++ b/sha1_name.c
@@ -380,7 +380,7 @@ static int show_ambiguous_object(const struct object_id *oid, void *data)
 	}
 
 	advise("  %s %s%s",
-	       find_unique_abbrev(oid->hash, DEFAULT_ABBREV),
+	       find_unique_abbrev(oid, DEFAULT_ABBREV),
 	       typename(type) ? typename(type) : "unknown type",
 	       desc.buf);
 
@@ -569,7 +569,7 @@ static void find_abbrev_len_packed(struct min_abbrev_data *mad)
 		find_abbrev_len_for_pack(p, mad);
 }
 
-int find_unique_abbrev_r(char *hex, const unsigned char *sha1, int len)
+int find_unique_abbrev_r(char *hex, const struct object_id *oid, int len)
 {
 	struct disambiguate_state ds;
 	struct min_abbrev_data mad;
@@ -596,14 +596,14 @@ int find_unique_abbrev_r(char *hex, const unsigned char *sha1, int len)
 			len = FALLBACK_DEFAULT_ABBREV;
 	}
 
-	sha1_to_hex_r(hex, sha1);
+	oid_to_hex_r(hex, oid);
 	if (len == GIT_SHA1_HEXSZ || !len)
 		return GIT_SHA1_HEXSZ;
 
 	mad.init_len = len;
 	mad.cur_len = len;
 	mad.hex = hex;
-	mad.hash = sha1;
+	mad.hash = oid->hash;
 
 	find_abbrev_len_packed(&mad);
 
@@ -621,13 +621,13 @@ int find_unique_abbrev_r(char *hex, const unsigned char *sha1, int len)
 	return mad.cur_len;
 }
 
-const char *find_unique_abbrev(const unsigned char *sha1, int len)
+const char *find_unique_abbrev(const struct object_id *oid, int len)
 {
 	static int bufno;
 	static char hexbuffer[4][GIT_MAX_HEXSZ + 1];
 	char *hex = hexbuffer[bufno];
 	bufno = (bufno + 1) % ARRAY_SIZE(hexbuffer);
-	find_unique_abbrev_r(hex, sha1, len);
+	find_unique_abbrev_r(hex, oid, len);
 	return hex;
 }
 
diff --git a/strbuf.c b/strbuf.c
index 128fbec503..3099c39f79 100644
--- a/strbuf.c
+++ b/strbuf.c
@@ -874,7 +874,7 @@ void strbuf_add_unique_abbrev(struct strbuf *sb, const struct object_id *oid,
 {
 	int r;
 	strbuf_grow(sb, GIT_SHA1_HEXSZ + 1);
-	r = find_unique_abbrev_r(sb->buf + sb->len, oid->hash, abbrev_len);
+	r = find_unique_abbrev_r(sb->buf + sb->len, oid, abbrev_len);
 	strbuf_setlen(sb, sb->len + r);
 }
 
diff --git a/tag.c b/tag.c
index fcbe012f7a..0b63c3f1ec 100644
--- a/tag.c
+++ b/tag.c
@@ -46,7 +46,7 @@ int gpg_verify_tag(const struct object_id *oid, const char *name_to_report,
 		return error("%s: cannot verify a non-tag object of type %s.",
 				name_to_report ?
 				name_to_report :
-				find_unique_abbrev(oid->hash, DEFAULT_ABBREV),
+				find_unique_abbrev(oid, DEFAULT_ABBREV),
 				typename(type));
 
 	buf = read_sha1_file(oid->hash, &type, &size);
@@ -54,7 +54,7 @@ int gpg_verify_tag(const struct object_id *oid, const char *name_to_report,
 		return error("%s: unable to read file.",
 				name_to_report ?
 				name_to_report :
-				find_unique_abbrev(oid->hash, DEFAULT_ABBREV));
+				find_unique_abbrev(oid, DEFAULT_ABBREV));
 
 	ret = run_gpg_verify(buf, size, flags);
 
diff --git a/transport.c b/transport.c
index 87de35dd5e..b9dfa11bd2 100644
--- a/transport.c
+++ b/transport.c
@@ -461,7 +461,7 @@ static int print_one_push_status(struct ref *ref, const char *dest, int count,
 static int measure_abbrev(const struct object_id *oid, int sofar)
 {
 	char hex[GIT_MAX_HEXSZ + 1];
-	int w = find_unique_abbrev_r(hex, oid->hash, DEFAULT_ABBREV);
+	int w = find_unique_abbrev_r(hex, oid, DEFAULT_ABBREV);
 
 	return (w < sofar) ? sofar : w;
 }
diff --git a/wt-status.c b/wt-status.c
index 698fa1d42a..e3e75e99a9 100644
--- a/wt-status.c
+++ b/wt-status.c
@@ -1349,7 +1349,7 @@ static void show_cherry_pick_in_progress(struct wt_status *s,
 					const char *color)
 {
 	status_printf_ln(s, color, _("You are currently cherry-picking commit %s."),
-			find_unique_abbrev(state->cherry_pick_head_oid.hash, DEFAULT_ABBREV));
+			find_unique_abbrev(&state->cherry_pick_head_oid, DEFAULT_ABBREV));
 	if (s->hints) {
 		if (has_unmerged(s))
 			status_printf_ln(s, color,
@@ -1368,7 +1368,7 @@ static void show_revert_in_progress(struct wt_status *s,
 					const char *color)
 {
 	status_printf_ln(s, color, _("You are currently reverting commit %s."),
-			 find_unique_abbrev(state->revert_head_oid.hash, DEFAULT_ABBREV));
+			 find_unique_abbrev(&state->revert_head_oid, DEFAULT_ABBREV));
 	if (s->hints) {
 		if (has_unmerged(s))
 			status_printf_ln(s, color,
@@ -1488,7 +1488,7 @@ static void wt_status_get_detached_from(struct wt_status_state *state)
 		state->detached_from = xstrdup(from);
 	} else
 		state->detached_from =
-			xstrdup(find_unique_abbrev(cb.noid.hash, DEFAULT_ABBREV));
+			xstrdup(find_unique_abbrev(&cb.noid, DEFAULT_ABBREV));
 	oidcpy(&state->detached_oid, &cb.noid);
 	state->detached_at = !get_oid("HEAD", &oid) &&
 			     !oidcmp(&oid, &state->detached_oid);

[PATCH v2 11/36] http-walker: convert struct object_request to use struct object_id

[brian m. carlson]

Convert struct object_request to use struct object_id by updating the
definition and applying the following semantic patch, plus the standard
object_id transforms:

@@
struct object_request E1;
@@
- E1.sha1
+ E1.oid.hash

@@
struct object_request *E1;
@@
- E1->sha1
+ E1->oid.hash

Signed-off-by: brian m. carlson <sandals@crustytoothpaste.net>
---
 http-walker.c | 16 ++++++++--------
 1 file changed, 8 insertions(+), 8 deletions(-)

diff --git a/http-walker.c b/http-walker.c
index 07c2b1af82..f506f394ac 100644
--- a/http-walker.c
+++ b/http-walker.c
@@ -22,7 +22,7 @@ enum object_request_state {
 
 struct object_request {
 	struct walker *walker;
-	unsigned char sha1[20];
+	struct object_id oid;
 	struct alt_base *repo;
 	enum object_request_state state;
 	struct http_object_request *req;
@@ -56,7 +56,7 @@ static void start_object_request(struct walker *walker,
 	struct active_request_slot *slot;
 	struct http_object_request *req;
 
-	req = new_http_object_request(obj_req->repo->base, obj_req->sha1);
+	req = new_http_object_request(obj_req->repo->base, obj_req->oid.hash);
 	if (req == NULL) {
 		obj_req->state = ABORTED;
 		return;
@@ -82,7 +82,7 @@ static void finish_object_request(struct object_request *obj_req)
 		return;
 
 	if (obj_req->req->rename == 0)
-		walker_say(obj_req->walker, "got %s\n", sha1_to_hex(obj_req->sha1));
+		walker_say(obj_req->walker, "got %s\n", oid_to_hex(&obj_req->oid));
 }
 
 static void process_object_response(void *callback_data)
@@ -129,7 +129,7 @@ static int fill_active_slot(struct walker *walker)
 	list_for_each_safe(pos, tmp, head) {
 		obj_req = list_entry(pos, struct object_request, node);
 		if (obj_req->state == WAITING) {
-			if (has_sha1_file(obj_req->sha1))
+			if (has_sha1_file(obj_req->oid.hash))
 				obj_req->state = COMPLETE;
 			else {
 				start_object_request(walker, obj_req);
@@ -148,7 +148,7 @@ static void prefetch(struct walker *walker, unsigned char *sha1)
 
 	newreq = xmalloc(sizeof(*newreq));
 	newreq->walker = walker;
-	hashcpy(newreq->sha1, sha1);
+	hashcpy(newreq->oid.hash, sha1);
 	newreq->repo = data->alt;
 	newreq->state = WAITING;
 	newreq->req = NULL;
@@ -481,13 +481,13 @@ static int fetch_object(struct walker *walker, unsigned char *sha1)
 
 	list_for_each(pos, head) {
 		obj_req = list_entry(pos, struct object_request, node);
-		if (!hashcmp(obj_req->sha1, sha1))
+		if (!hashcmp(obj_req->oid.hash, sha1))
 			break;
 	}
 	if (obj_req == NULL)
 		return error("Couldn't find request for %s in the queue", hex);
 
-	if (has_sha1_file(obj_req->sha1)) {
+	if (has_sha1_file(obj_req->oid.hash)) {
 		if (obj_req->req != NULL)
 			abort_http_object_request(obj_req->req);
 		abort_object_request(obj_req);
@@ -541,7 +541,7 @@ static int fetch_object(struct walker *walker, unsigned char *sha1)
 	} else if (req->zret != Z_STREAM_END) {
 		walker->corrupt_object_found++;
 		ret = error("File %s (%s) corrupt", hex, req->url);
-	} else if (hashcmp(obj_req->sha1, req->real_sha1)) {
+	} else if (hashcmp(obj_req->oid.hash, req->real_sha1)) {
 		ret = error("File %s has bad hash", hex);
 	} else if (req->rename < 0) {
 		struct strbuf buf = STRBUF_INIT;

[PATCH v2 12/36] send-pack: convert remaining functions to struct object_id

[brian m. carlson]

Convert the remaining function, feed_object, to use struct object_id.

Signed-off-by: brian m. carlson <sandals@crustytoothpaste.net>
---
 send-pack.c | 12 ++++++------
 1 file changed, 6 insertions(+), 6 deletions(-)

diff --git a/send-pack.c b/send-pack.c
index 2112d3b27a..7350af8883 100644
--- a/send-pack.c
+++ b/send-pack.c
@@ -37,14 +37,14 @@ int option_parse_push_signed(const struct option *opt,
 	die("bad %s argument: %s", opt->long_name, arg);
 }
 
-static void feed_object(const unsigned char *sha1, FILE *fh, int negative)
+static void feed_object(const struct object_id *oid, FILE *fh, int negative)
 {
-	if (negative && !has_sha1_file(sha1))
+	if (negative && !has_sha1_file(oid->hash))
 		return;
 
 	if (negative)
 		putc('^', fh);
-	fputs(sha1_to_hex(sha1), fh);
+	fputs(oid_to_hex(oid), fh);
 	putc('\n', fh);
 }
 
@@ -89,13 +89,13 @@ static int pack_objects(int fd, struct ref *refs, struct oid_array *extra, struc
 	 */
 	po_in = xfdopen(po.in, "w");
 	for (i = 0; i < extra->nr; i++)
-		feed_object(extra->oid[i].hash, po_in, 1);
+		feed_object(&extra->oid[i], po_in, 1);
 
 	while (refs) {
 		if (!is_null_oid(&refs->old_oid))
-			feed_object(refs->old_oid.hash, po_in, 1);
+			feed_object(&refs->old_oid, po_in, 1);
 		if (!is_null_oid(&refs->new_oid))
-			feed_object(refs->new_oid.hash, po_in, 0);
+			feed_object(&refs->new_oid, po_in, 0);
 		refs = refs->next;
 	}
 

[PATCH v2 13/36] replace_object: convert struct replace_object to object_id

[brian m. carlson]

Convert the two members of this struct to be instances of struct
object_id.  Adjust the various functions in this file accordingly.

Signed-off-by: brian m. carlson <sandals@crustytoothpaste.net>
---
 replace_object.c | 14 +++++++-------
 1 file changed, 7 insertions(+), 7 deletions(-)

diff --git a/replace_object.c b/replace_object.c
index 3e49965d05..232e8b8550 100644
--- a/replace_object.c
+++ b/replace_object.c
@@ -8,8 +8,8 @@
  * sha1.
  */
 static struct replace_object {
-	unsigned char original[20];
-	unsigned char replacement[20];
+	struct object_id original;
+	struct object_id replacement;
 } **replace_object;
 
 static int replace_object_alloc, replace_object_nr;
@@ -17,7 +17,7 @@ static int replace_object_alloc, replace_object_nr;
 static const unsigned char *replace_sha1_access(size_t index, void *table)
 {
 	struct replace_object **replace = table;
-	return replace[index]->original;
+	return replace[index]->original.hash;
 }
 
 static int replace_object_pos(const unsigned char *sha1)
@@ -29,7 +29,7 @@ static int replace_object_pos(const unsigned char *sha1)
 static int register_replace_object(struct replace_object *replace,
 				   int ignore_dups)
 {
-	int pos = replace_object_pos(replace->original);
+	int pos = replace_object_pos(replace->original.hash);
 
 	if (0 <= pos) {
 		if (ignore_dups)
@@ -59,14 +59,14 @@ static int register_replace_ref(const char *refname,
 	const char *hash = slash ? slash + 1 : refname;
 	struct replace_object *repl_obj = xmalloc(sizeof(*repl_obj));
 
-	if (strlen(hash) != 40 || get_sha1_hex(hash, repl_obj->original)) {
+	if (get_oid_hex(hash, &repl_obj->original)) {
 		free(repl_obj);
 		warning("bad replace ref name: %s", refname);
 		return 0;
 	}
 
 	/* Copy sha1 from the read ref */
-	hashcpy(repl_obj->replacement, oid->hash);
+	oidcpy(&repl_obj->replacement, oid);
 
 	/* Register new object */
 	if (register_replace_object(repl_obj, 1))
@@ -113,7 +113,7 @@ const unsigned char *do_lookup_replace_object(const unsigned char *sha1)
 
 		pos = replace_object_pos(cur);
 		if (0 <= pos)
-			cur = replace_object[pos]->replacement;
+			cur = replace_object[pos]->replacement.hash;
 	} while (0 <= pos);
 
 	return cur;

[PATCH v2 14/36] builtin/mktag: convert to struct object_id

[brian m. carlson]

Signed-off-by: brian m. carlson <sandals@crustytoothpaste.net>
---
 builtin/mktag.c | 18 +++++++++---------
 1 file changed, 9 insertions(+), 9 deletions(-)

diff --git a/builtin/mktag.c b/builtin/mktag.c
index beb552847b..65bb41e3cd 100644
--- a/builtin/mktag.c
+++ b/builtin/mktag.c
@@ -18,13 +18,13 @@
 /*
  * We refuse to tag something we can't verify. Just because.
  */
-static int verify_object(const unsigned char *sha1, const char *expected_type)
+static int verify_object(const struct object_id *oid, const char *expected_type)
 {
 	int ret = -1;
 	enum object_type type;
 	unsigned long size;
-	void *buffer = read_sha1_file(sha1, &type, &size);
-	const unsigned char *repl = lookup_replace_object(sha1);
+	void *buffer = read_sha1_file(oid->hash, &type, &size);
+	const unsigned char *repl = lookup_replace_object(oid->hash);
 
 	if (buffer) {
 		if (type == type_from_string(expected_type))
@@ -38,8 +38,8 @@ static int verify_tag(char *buffer, unsigned long size)
 {
 	int typelen;
 	char type[20];
-	unsigned char sha1[20];
-	const char *object, *type_line, *tag_line, *tagger_line, *lb, *rb;
+	struct object_id oid;
+	const char *object, *type_line, *tag_line, *tagger_line, *lb, *rb, *p;
 	size_t len;
 
 	if (size < 84)
@@ -52,11 +52,11 @@ static int verify_tag(char *buffer, unsigned long size)
 	if (memcmp(object, "object ", 7))
 		return error("char%d: does not start with \"object \"", 0);
 
-	if (get_sha1_hex(object + 7, sha1))
+	if (parse_oid_hex(object + 7, &oid, &p))
 		return error("char%d: could not get SHA1 hash", 7);
 
 	/* Verify type line */
-	type_line = object + 48;
+	type_line = p + 1;
 	if (memcmp(type_line - 1, "\ntype ", 6))
 		return error("char%d: could not find \"\\ntype \"", 47);
 
@@ -80,8 +80,8 @@ static int verify_tag(char *buffer, unsigned long size)
 	type[typelen] = 0;
 
 	/* Verify that the object matches */
-	if (verify_object(sha1, type))
-		return error("char%d: could not verify object %s", 7, sha1_to_hex(sha1));
+	if (verify_object(&oid, type))
+		return error("char%d: could not verify object %s", 7, oid_to_hex(&oid));
 
 	/* Verify the tag-name: we don't allow control characters or spaces in it */
 	tag_line += 4;

[PATCH v2 15/36] archive: convert write_archive_entry_fn_t to object_id

[brian m. carlson]

Convert the write_archive_entry_fn_t type to use a pointer to struct
object_id.  Convert various static functions in the tar and zip
archivers also.

Signed-off-by: brian m. carlson <sandals@crustytoothpaste.net>
---
 archive-tar.c | 28 ++++++++++++++--------------
 archive-zip.c | 16 ++++++++--------
 archive.c     | 12 ++++++------
 archive.h     |  2 +-
 4 files changed, 29 insertions(+), 29 deletions(-)

diff --git a/archive-tar.c b/archive-tar.c
index c6ed96ee74..24b1ccef3a 100644
--- a/archive-tar.c
+++ b/archive-tar.c
@@ -111,7 +111,7 @@ static void write_trailer(void)
  * queues up writes, so that all our write(2) calls write exactly one
  * full block; pads writes to RECORDSIZE
  */
-static int stream_blocked(const unsigned char *sha1)
+static int stream_blocked(const struct object_id *oid)
 {
 	struct git_istream *st;
 	enum object_type type;
@@ -119,9 +119,9 @@ static int stream_blocked(const unsigned char *sha1)
 	char buf[BLOCKSIZE];
 	ssize_t readlen;
 
-	st = open_istream(sha1, &type, &sz, NULL);
+	st = open_istream(oid->hash, &type, &sz, NULL);
 	if (!st)
-		return error("cannot stream blob %s", sha1_to_hex(sha1));
+		return error("cannot stream blob %s", oid_to_hex(oid));
 	for (;;) {
 		readlen = read_istream(st, buf, sizeof(buf));
 		if (readlen <= 0)
@@ -218,7 +218,7 @@ static void prepare_header(struct archiver_args *args,
 }
 
 static void write_extended_header(struct archiver_args *args,
-				  const unsigned char *sha1,
+				  const struct object_id *oid,
 				  const void *buffer, unsigned long size)
 {
 	struct ustar_header header;
@@ -226,14 +226,14 @@ static void write_extended_header(struct archiver_args *args,
 	memset(&header, 0, sizeof(header));
 	*header.typeflag = TYPEFLAG_EXT_HEADER;
 	mode = 0100666;
-	xsnprintf(header.name, sizeof(header.name), "%s.paxheader", sha1_to_hex(sha1));
+	xsnprintf(header.name, sizeof(header.name), "%s.paxheader", oid_to_hex(oid));
 	prepare_header(args, &header, mode, size);
 	write_blocked(&header, sizeof(header));
 	write_blocked(buffer, size);
 }
 
 static int write_tar_entry(struct archiver_args *args,
-			   const unsigned char *sha1,
+			   const struct object_id *oid,
 			   const char *path, size_t pathlen,
 			   unsigned int mode)
 {
@@ -257,7 +257,7 @@ static int write_tar_entry(struct archiver_args *args,
 		mode = (mode | ((mode & 0100) ? 0777 : 0666)) & ~tar_umask;
 	} else {
 		return error("unsupported file mode: 0%o (SHA1: %s)",
-			     mode, sha1_to_hex(sha1));
+			     mode, oid_to_hex(oid));
 	}
 	if (pathlen > sizeof(header.name)) {
 		size_t plen = get_path_prefix(path, pathlen,
@@ -268,7 +268,7 @@ static int write_tar_entry(struct archiver_args *args,
 			memcpy(header.name, path + plen + 1, rest);
 		} else {
 			xsnprintf(header.name, sizeof(header.name), "%s.data",
-				  sha1_to_hex(sha1));
+				  oid_to_hex(oid));
 			strbuf_append_ext_header(&ext_header, "path",
 						 path, pathlen);
 		}
@@ -276,14 +276,14 @@ static int write_tar_entry(struct archiver_args *args,
 		memcpy(header.name, path, pathlen);
 
 	if (S_ISREG(mode) && !args->convert &&
-	    sha1_object_info(sha1, &size) == OBJ_BLOB &&
+	    sha1_object_info(oid->hash, &size) == OBJ_BLOB &&
 	    size > big_file_threshold)
 		buffer = NULL;
 	else if (S_ISLNK(mode) || S_ISREG(mode)) {
 		enum object_type type;
-		buffer = sha1_file_to_archive(args, path, sha1, old_mode, &type, &size);
+		buffer = sha1_file_to_archive(args, path, oid->hash, old_mode, &type, &size);
 		if (!buffer)
-			return error("cannot read %s", sha1_to_hex(sha1));
+			return error("cannot read %s", oid_to_hex(oid));
 	} else {
 		buffer = NULL;
 		size = 0;
@@ -292,7 +292,7 @@ static int write_tar_entry(struct archiver_args *args,
 	if (S_ISLNK(mode)) {
 		if (size > sizeof(header.linkname)) {
 			xsnprintf(header.linkname, sizeof(header.linkname),
-				  "see %s.paxheader", sha1_to_hex(sha1));
+				  "see %s.paxheader", oid_to_hex(oid));
 			strbuf_append_ext_header(&ext_header, "linkpath",
 			                         buffer, size);
 		} else
@@ -308,7 +308,7 @@ static int write_tar_entry(struct archiver_args *args,
 	prepare_header(args, &header, mode, size_in_header);
 
 	if (ext_header.len > 0) {
-		write_extended_header(args, sha1, ext_header.buf,
+		write_extended_header(args, oid, ext_header.buf,
 				      ext_header.len);
 	}
 	strbuf_release(&ext_header);
@@ -317,7 +317,7 @@ static int write_tar_entry(struct archiver_args *args,
 		if (buffer)
 			write_blocked(buffer, size);
 		else
-			err = stream_blocked(sha1);
+			err = stream_blocked(oid);
 	}
 	free(buffer);
 	return err;
diff --git a/archive-zip.c b/archive-zip.c
index e8913e5a26..e2e5513c03 100644
--- a/archive-zip.c
+++ b/archive-zip.c
@@ -276,7 +276,7 @@ static int entry_is_binary(const char *path, const void *buffer, size_t size)
 #define STREAM_BUFFER_SIZE (1024 * 16)
 
 static int write_zip_entry(struct archiver_args *args,
-			   const unsigned char *sha1,
+			   const struct object_id *oid,
 			   const char *path, size_t pathlen,
 			   unsigned int mode)
 {
@@ -314,7 +314,7 @@ static int write_zip_entry(struct archiver_args *args,
 
 	if (pathlen > 0xffff) {
 		return error("path too long (%d chars, SHA1: %s): %s",
-				(int)pathlen, sha1_to_hex(sha1), path);
+				(int)pathlen, oid_to_hex(oid), path);
 	}
 
 	if (S_ISDIR(mode) || S_ISGITLINK(mode)) {
@@ -325,7 +325,7 @@ static int write_zip_entry(struct archiver_args *args,
 		compressed_size = 0;
 		buffer = NULL;
 	} else if (S_ISREG(mode) || S_ISLNK(mode)) {
-		enum object_type type = sha1_object_info(sha1, &size);
+		enum object_type type = sha1_object_info(oid->hash, &size);
 
 		method = 0;
 		attr2 = S_ISLNK(mode) ? ((mode | 0777) << 16) :
@@ -337,18 +337,18 @@ static int write_zip_entry(struct archiver_args *args,
 
 		if (S_ISREG(mode) && type == OBJ_BLOB && !args->convert &&
 		    size > big_file_threshold) {
-			stream = open_istream(sha1, &type, &size, NULL);
+			stream = open_istream(oid->hash, &type, &size, NULL);
 			if (!stream)
 				return error("cannot stream blob %s",
-					     sha1_to_hex(sha1));
+					     oid_to_hex(oid));
 			flags |= ZIP_STREAM;
 			out = buffer = NULL;
 		} else {
-			buffer = sha1_file_to_archive(args, path, sha1, mode,
+			buffer = sha1_file_to_archive(args, path, oid->hash, mode,
 						      &type, &size);
 			if (!buffer)
 				return error("cannot read %s",
-					     sha1_to_hex(sha1));
+					     oid_to_hex(oid));
 			crc = crc32(crc, buffer, size);
 			is_binary = entry_is_binary(path_without_prefix,
 						    buffer, size);
@@ -357,7 +357,7 @@ static int write_zip_entry(struct archiver_args *args,
 		compressed_size = (method == 0) ? size : 0;
 	} else {
 		return error("unsupported file mode: 0%o (SHA1: %s)", mode,
-				sha1_to_hex(sha1));
+				oid_to_hex(oid));
 	}
 
 	if (creator_version > max_creator_version)
diff --git a/archive.c b/archive.c
index e664cdb624..4942b5632b 100644
--- a/archive.c
+++ b/archive.c
@@ -121,7 +121,7 @@ static int check_attr_export_subst(const struct attr_check *check)
 	return check && ATTR_TRUE(check->items[1].value);
 }
 
-static int write_archive_entry(const unsigned char *sha1, const char *base,
+static int write_archive_entry(const struct object_id *oid, const char *base,
 		int baselen, const char *filename, unsigned mode, int stage,
 		void *context)
 {
@@ -153,7 +153,7 @@ static int write_archive_entry(const unsigned char *sha1, const char *base,
 	if (S_ISDIR(mode) || S_ISGITLINK(mode)) {
 		if (args->verbose)
 			fprintf(stderr, "%.*s\n", (int)path.len, path.buf);
-		err = write_entry(args, sha1, path.buf, path.len, mode);
+		err = write_entry(args, oid, path.buf, path.len, mode);
 		if (err)
 			return err;
 		return (S_ISDIR(mode) ? READ_TREE_RECURSIVE : 0);
@@ -161,7 +161,7 @@ static int write_archive_entry(const unsigned char *sha1, const char *base,
 
 	if (args->verbose)
 		fprintf(stderr, "%.*s\n", (int)path.len, path.buf);
-	return write_entry(args, sha1, path.buf, path.len, mode);
+	return write_entry(args, oid, path.buf, path.len, mode);
 }
 
 static void queue_directory(const unsigned char *sha1,
@@ -191,7 +191,7 @@ static int write_directory(struct archiver_context *c)
 	d->path[d->len - 1] = '\0'; /* no trailing slash */
 	ret =
 		write_directory(c) ||
-		write_archive_entry(d->oid.hash, d->path, d->baselen,
+		write_archive_entry(&d->oid, d->path, d->baselen,
 				    d->path + d->baselen, d->mode,
 				    d->stage, c) != READ_TREE_RECURSIVE;
 	free(d);
@@ -231,7 +231,7 @@ static int queue_or_write_archive_entry(const struct object_id *oid,
 
 	if (write_directory(c))
 		return -1;
-	return write_archive_entry(oid->hash, base->buf, base->len, filename, mode,
+	return write_archive_entry(oid, base->buf, base->len, filename, mode,
 				   stage, context);
 }
 
@@ -250,7 +250,7 @@ int write_archive_entries(struct archiver_args *args,
 			len--;
 		if (args->verbose)
 			fprintf(stderr, "%.*s\n", (int)len, args->base);
-		err = write_entry(args, args->tree->object.oid.hash, args->base,
+		err = write_entry(args, &args->tree->object.oid, args->base,
 				  len, 040777);
 		if (err)
 			return err;
diff --git a/archive.h b/archive.h
index 62d1d82c1a..741991bfb6 100644
--- a/archive.h
+++ b/archive.h
@@ -31,7 +31,7 @@ extern void init_tar_archiver(void);
 extern void init_zip_archiver(void);
 
 typedef int (*write_archive_entry_fn_t)(struct archiver_args *args,
-					const unsigned char *sha1,
+					const struct object_id *oid,
 					const char *path, size_t pathlen,
 					unsigned int mode);
 

[PATCH v2 16/36] archive: convert sha1_file_to_archive to struct object_id

[brian m. carlson]

Convert this function to take a pointer to struct object_id and rename
it object_file_to_archive.

Signed-off-by: brian m. carlson <sandals@crustytoothpaste.net>
---
 archive-tar.c |  2 +-
 archive-zip.c |  4 ++--
 archive.c     | 10 +++++-----
 archive.h     |  8 ++++----
 4 files changed, 12 insertions(+), 12 deletions(-)

diff --git a/archive-tar.c b/archive-tar.c
index 24b1ccef3a..fd622eacc0 100644
--- a/archive-tar.c
+++ b/archive-tar.c
@@ -281,7 +281,7 @@ static int write_tar_entry(struct archiver_args *args,
 		buffer = NULL;
 	else if (S_ISLNK(mode) || S_ISREG(mode)) {
 		enum object_type type;
-		buffer = sha1_file_to_archive(args, path, oid->hash, old_mode, &type, &size);
+		buffer = object_file_to_archive(args, path, oid, old_mode, &type, &size);
 		if (!buffer)
 			return error("cannot read %s", oid_to_hex(oid));
 	} else {
diff --git a/archive-zip.c b/archive-zip.c
index e2e5513c03..5841a6ceb6 100644
--- a/archive-zip.c
+++ b/archive-zip.c
@@ -344,8 +344,8 @@ static int write_zip_entry(struct archiver_args *args,
 			flags |= ZIP_STREAM;
 			out = buffer = NULL;
 		} else {
-			buffer = sha1_file_to_archive(args, path, oid->hash, mode,
-						      &type, &size);
+			buffer = object_file_to_archive(args, path, oid, mode,
+							&type, &size);
 			if (!buffer)
 				return error("cannot read %s",
 					     oid_to_hex(oid));
diff --git a/archive.c b/archive.c
index 4942b5632b..da62b2f541 100644
--- a/archive.c
+++ b/archive.c
@@ -63,16 +63,16 @@ static void format_subst(const struct commit *commit,
 	free(to_free);
 }
 
-void *sha1_file_to_archive(const struct archiver_args *args,
-			   const char *path, const unsigned char *sha1,
-			   unsigned int mode, enum object_type *type,
-			   unsigned long *sizep)
+void *object_file_to_archive(const struct archiver_args *args,
+			     const char *path, const struct object_id *oid,
+			     unsigned int mode, enum object_type *type,
+			     unsigned long *sizep)
 {
 	void *buffer;
 	const struct commit *commit = args->convert ? args->commit : NULL;
 
 	path += args->baselen;
-	buffer = read_sha1_file(sha1, type, sizep);
+	buffer = read_sha1_file(oid->hash, type, sizep);
 	if (buffer && S_ISREG(mode)) {
 		struct strbuf buf = STRBUF_INIT;
 		size_t size = 0;
diff --git a/archive.h b/archive.h
index 741991bfb6..1f9954f7cd 100644
--- a/archive.h
+++ b/archive.h
@@ -39,9 +39,9 @@ extern int write_archive_entries(struct archiver_args *args, write_archive_entry
 extern int write_archive(int argc, const char **argv, const char *prefix, const char *name_hint, int remote);
 
 const char *archive_format_from_filename(const char *filename);
-extern void *sha1_file_to_archive(const struct archiver_args *args,
-				  const char *path, const unsigned char *sha1,
-				  unsigned int mode, enum object_type *type,
-				  unsigned long *sizep);
+extern void *object_file_to_archive(const struct archiver_args *args,
+				    const char *path, const struct object_id *oid,
+				    unsigned int mode, enum object_type *type,
+				    unsigned long *sizep);
 
 #endif	/* ARCHIVE_H */

[PATCH v2 17/36] builtin/index-pack: convert struct ref_delta_entry to object_id

[brian m. carlson]

Convert this struct to use a member of type object_id.  Convert various
static functions as well.

Signed-off-by: brian m. carlson <sandals@crustytoothpaste.net>
---
 builtin/index-pack.c | 34 +++++++++++++++++-----------------
 1 file changed, 17 insertions(+), 17 deletions(-)

diff --git a/builtin/index-pack.c b/builtin/index-pack.c
index 7e3e1a461c..5c7ab47c36 100644
--- a/builtin/index-pack.c
+++ b/builtin/index-pack.c
@@ -58,7 +58,7 @@ struct ofs_delta_entry {
 };
 
 struct ref_delta_entry {
-	unsigned char sha1[20];
+	struct object_id oid;
 	int obj_no;
 };
 
@@ -671,18 +671,18 @@ static void find_ofs_delta_children(off_t offset,
 	*last_index = last;
 }
 
-static int compare_ref_delta_bases(const unsigned char *sha1,
-				   const unsigned char *sha2,
+static int compare_ref_delta_bases(const struct object_id *oid1,
+				   const struct object_id *oid2,
 				   enum object_type type1,
 				   enum object_type type2)
 {
 	int cmp = type1 - type2;
 	if (cmp)
 		return cmp;
-	return hashcmp(sha1, sha2);
+	return oidcmp(oid1, oid2);
 }
 
-static int find_ref_delta(const unsigned char *sha1, enum object_type type)
+static int find_ref_delta(const struct object_id *oid, enum object_type type)
 {
 	int first = 0, last = nr_ref_deltas;
 
@@ -691,7 +691,7 @@ static int find_ref_delta(const unsigned char *sha1, enum object_type type)
 		struct ref_delta_entry *delta = &ref_deltas[next];
 		int cmp;
 
-		cmp = compare_ref_delta_bases(sha1, delta->sha1,
+		cmp = compare_ref_delta_bases(oid, &delta->oid,
 					      type, objects[delta->obj_no].type);
 		if (!cmp)
 			return next;
@@ -704,11 +704,11 @@ static int find_ref_delta(const unsigned char *sha1, enum object_type type)
 	return -first-1;
 }
 
-static void find_ref_delta_children(const unsigned char *sha1,
+static void find_ref_delta_children(const struct object_id *oid,
 				    int *first_index, int *last_index,
 				    enum object_type type)
 {
-	int first = find_ref_delta(sha1, type);
+	int first = find_ref_delta(oid, type);
 	int last = first;
 	int end = nr_ref_deltas - 1;
 
@@ -717,9 +717,9 @@ static void find_ref_delta_children(const unsigned char *sha1,
 		*last_index = -1;
 		return;
 	}
-	while (first > 0 && !hashcmp(ref_deltas[first - 1].sha1, sha1))
+	while (first > 0 && !oidcmp(&ref_deltas[first - 1].oid, oid))
 		--first;
-	while (last < end && !hashcmp(ref_deltas[last + 1].sha1, sha1))
+	while (last < end && !oidcmp(&ref_deltas[last + 1].oid, oid))
 		++last;
 	*first_index = first;
 	*last_index = last;
@@ -991,7 +991,7 @@ static struct base_data *find_unresolved_deltas_1(struct base_data *base,
 						  struct base_data *prev_base)
 {
 	if (base->ref_last == -1 && base->ofs_last == -1) {
-		find_ref_delta_children(base->obj->idx.oid.hash,
+		find_ref_delta_children(&base->obj->idx.oid,
 					&base->ref_first, &base->ref_last,
 					OBJ_REF_DELTA);
 
@@ -1075,7 +1075,7 @@ static int compare_ref_delta_entry(const void *a, const void *b)
 	const struct ref_delta_entry *delta_a = a;
 	const struct ref_delta_entry *delta_b = b;
 
-	return hashcmp(delta_a->sha1, delta_b->sha1);
+	return oidcmp(&delta_a->oid, &delta_b->oid);
 }
 
 static void resolve_base(struct object_entry *obj)
@@ -1141,7 +1141,7 @@ static void parse_pack_objects(unsigned char *hash)
 			ofs_delta++;
 		} else if (obj->type == OBJ_REF_DELTA) {
 			ALLOC_GROW(ref_deltas, nr_ref_deltas + 1, ref_deltas_alloc);
-			hashcpy(ref_deltas[nr_ref_deltas].sha1, ref_delta_oid.hash);
+			oidcpy(&ref_deltas[nr_ref_deltas].oid, &ref_delta_oid);
 			ref_deltas[nr_ref_deltas].obj_no = i;
 			nr_ref_deltas++;
 		} else if (!data) {
@@ -1373,14 +1373,14 @@ static void fix_unresolved_deltas(struct hashfile *f)
 
 		if (objects[d->obj_no].real_type != OBJ_REF_DELTA)
 			continue;
-		base_obj->data = read_sha1_file(d->sha1, &type, &base_obj->size);
+		base_obj->data = read_sha1_file(d->oid.hash, &type, &base_obj->size);
 		if (!base_obj->data)
 			continue;
 
-		if (check_sha1_signature(d->sha1, base_obj->data,
+		if (check_sha1_signature(d->oid.hash, base_obj->data,
 				base_obj->size, typename(type)))
-			die(_("local object %s is corrupt"), sha1_to_hex(d->sha1));
-		base_obj->obj = append_obj_to_pack(f, d->sha1,
+			die(_("local object %s is corrupt"), oid_to_hex(&d->oid));
+		base_obj->obj = append_obj_to_pack(f, d->oid.hash,
 					base_obj->data, base_obj->size, type);
 		find_unresolved_deltas(base_obj);
 		display_progress(progress, nr_resolved_deltas);

[PATCH v2 18/36] sha1_file: convert read_loose_object to use struct object_id

[brian m. carlson]

Signed-off-by: brian m. carlson <sandals@crustytoothpaste.net>
---
 builtin/fsck.c |  2 +-
 cache.h        |  4 ++--
 sha1_file.c    | 10 +++++-----
 3 files changed, 8 insertions(+), 8 deletions(-)

diff --git a/builtin/fsck.c b/builtin/fsck.c
index 9981db2263..57509a4eac 100644
--- a/builtin/fsck.c
+++ b/builtin/fsck.c
@@ -513,7 +513,7 @@ static struct object *parse_loose_object(const struct object_id *oid,
 	unsigned long size;
 	int eaten;
 
-	if (read_loose_object(path, oid->hash, &type, &size, &contents) < 0)
+	if (read_loose_object(path, oid, &type, &size, &contents) < 0)
 		return NULL;
 
 	if (!contents && type != OBJ_BLOB)
diff --git a/cache.h b/cache.h
index 09cd994bcc..8a9055f4e7 100644
--- a/cache.h
+++ b/cache.h
@@ -1241,14 +1241,14 @@ extern int check_sha1_signature(const unsigned char *sha1, void *buf, unsigned l
 extern int finalize_object_file(const char *tmpfile, const char *filename);
 
 /*
- * Open the loose object at path, check its sha1, and return the contents,
+ * Open the loose object at path, check its hash, and return the contents,
  * type, and size. If the object is a blob, then "contents" may return NULL,
  * to allow streaming of large blobs.
  *
  * Returns 0 on success, negative on error (details may be written to stderr).
  */
 int read_loose_object(const char *path,
-		      const unsigned char *expected_sha1,
+		      const struct object_id *expected_oid,
 		      enum object_type *type,
 		      unsigned long *size,
 		      void **contents);
diff --git a/sha1_file.c b/sha1_file.c
index c1d06c6109..69e8d27773 100644
--- a/sha1_file.c
+++ b/sha1_file.c
@@ -2176,7 +2176,7 @@ static int check_stream_sha1(git_zstream *stream,
 }
 
 int read_loose_object(const char *path,
-		      const unsigned char *expected_sha1,
+		      const struct object_id *expected_oid,
 		      enum object_type *type,
 		      unsigned long *size,
 		      void **contents)
@@ -2208,19 +2208,19 @@ int read_loose_object(const char *path,
 	}
 
 	if (*type == OBJ_BLOB) {
-		if (check_stream_sha1(&stream, hdr, *size, path, expected_sha1) < 0)
+		if (check_stream_sha1(&stream, hdr, *size, path, expected_oid->hash) < 0)
 			goto out;
 	} else {
-		*contents = unpack_sha1_rest(&stream, hdr, *size, expected_sha1);
+		*contents = unpack_sha1_rest(&stream, hdr, *size, expected_oid->hash);
 		if (!*contents) {
 			error("unable to unpack contents of %s", path);
 			git_inflate_end(&stream);
 			goto out;
 		}
-		if (check_sha1_signature(expected_sha1, *contents,
+		if (check_sha1_signature(expected_oid->hash, *contents,
 					 *size, typename(*type))) {
 			error("sha1 mismatch for %s (expected %s)", path,
-			      sha1_to_hex(expected_sha1));
+			      oid_to_hex(expected_oid));
 			free(*contents);
 			goto out;
 		}

[PATCH v2 19/36] sha1_file: convert check_sha1_signature to struct object_id

[brian m. carlson]

Convert this function to take a pointer to struct object_id and rename
it check_object_signature.  Introduce temporaries to convert the return
values of lookup_replace_object and lookup_replace_object_extended into
struct object_id.

The temporaries are needed because in order to convert
lookup_replace_object, open_istream needs to be converted, and
open_istream needs check_sha1_signature to be converted, causing a loop
of dependencies.  The temporaries will be removed in a future patch.

Signed-off-by: brian m. carlson <sandals@crustytoothpaste.net>
---
 builtin/fast-export.c |  2 +-
 builtin/index-pack.c  |  2 +-
 builtin/mktag.c       |  5 ++++-
 cache.h               |  2 +-
 object.c              | 10 ++++++++--
 pack-check.c          |  4 ++--
 sha1_file.c           | 12 ++++++------
 7 files changed, 23 insertions(+), 14 deletions(-)

diff --git a/builtin/fast-export.c b/builtin/fast-export.c
index 796d0cd66c..293a6615fa 100644
--- a/builtin/fast-export.c
+++ b/builtin/fast-export.c
@@ -240,7 +240,7 @@ static void export_blob(const struct object_id *oid)
 		buf = read_sha1_file(oid->hash, &type, &size);
 		if (!buf)
 			die ("Could not read blob %s", oid_to_hex(oid));
-		if (check_sha1_signature(oid->hash, buf, size, typename(type)) < 0)
+		if (check_object_signature(oid, buf, size, typename(type)) < 0)
 			die("sha1 mismatch in blob %s", oid_to_hex(oid));
 		object = parse_object_buffer(oid, type, size, buf, &eaten);
 	}
diff --git a/builtin/index-pack.c b/builtin/index-pack.c
index 5c7ab47c36..e0a776f1ac 100644
--- a/builtin/index-pack.c
+++ b/builtin/index-pack.c
@@ -1377,7 +1377,7 @@ static void fix_unresolved_deltas(struct hashfile *f)
 		if (!base_obj->data)
 			continue;
 
-		if (check_sha1_signature(d->oid.hash, base_obj->data,
+		if (check_object_signature(&d->oid, base_obj->data,
 				base_obj->size, typename(type)))
 			die(_("local object %s is corrupt"), oid_to_hex(&d->oid));
 		base_obj->obj = append_obj_to_pack(f, d->oid.hash,
diff --git a/builtin/mktag.c b/builtin/mktag.c
index 65bb41e3cd..810b24bef3 100644
--- a/builtin/mktag.c
+++ b/builtin/mktag.c
@@ -27,8 +27,11 @@ static int verify_object(const struct object_id *oid, const char *expected_type)
 	const unsigned char *repl = lookup_replace_object(oid->hash);
 
 	if (buffer) {
+		struct object_id reploid;
+		hashcpy(reploid.hash, repl);
+
 		if (type == type_from_string(expected_type))
-			ret = check_sha1_signature(repl, buffer, size, expected_type);
+			ret = check_object_signature(&reploid, buffer, size, expected_type);
 		free(buffer);
 	}
 	return ret;
diff --git a/cache.h b/cache.h
index 8a9055f4e7..f29ff43bbd 100644
--- a/cache.h
+++ b/cache.h
@@ -1236,7 +1236,7 @@ extern void *map_sha1_file(const unsigned char *sha1, unsigned long *size);
 extern int unpack_sha1_header(git_zstream *stream, unsigned char *map, unsigned long mapsize, void *buffer, unsigned long bufsiz);
 extern int parse_sha1_header(const char *hdr, unsigned long *sizep);
 
-extern int check_sha1_signature(const unsigned char *sha1, void *buf, unsigned long size, const char *type);
+extern int check_object_signature(const struct object_id *oid, void *buf, unsigned long size, const char *type);
 
 extern int finalize_object_file(const char *tmpfile, const char *filename);
 
diff --git a/object.c b/object.c
index 9e6f9ff20b..c63f02a40f 100644
--- a/object.c
+++ b/object.c
@@ -255,7 +255,10 @@ struct object *parse_object(const struct object_id *oid)
 	if ((obj && obj->type == OBJ_BLOB && has_object_file(oid)) ||
 	    (!obj && has_object_file(oid) &&
 	     sha1_object_info(oid->hash, NULL) == OBJ_BLOB)) {
-		if (check_sha1_signature(repl, NULL, 0, NULL) < 0) {
+		struct object_id reploid;
+		hashcpy(reploid.hash, repl);
+
+		if (check_object_signature(&reploid, NULL, 0, NULL) < 0) {
 			error("sha1 mismatch %s", oid_to_hex(oid));
 			return NULL;
 		}
@@ -265,7 +268,10 @@ struct object *parse_object(const struct object_id *oid)
 
 	buffer = read_sha1_file(oid->hash, &type, &size);
 	if (buffer) {
-		if (check_sha1_signature(repl, buffer, size, typename(type)) < 0) {
+		struct object_id reploid;
+		hashcpy(reploid.hash, repl);
+
+		if (check_object_signature(&reploid, buffer, size, typename(type)) < 0) {
 			free(buffer);
 			error("sha1 mismatch %s", sha1_to_hex(repl));
 			return NULL;
diff --git a/pack-check.c b/pack-check.c
index 403a572567..80ef7c1c63 100644
--- a/pack-check.c
+++ b/pack-check.c
@@ -126,7 +126,7 @@ static int verify_packfile(struct packed_git *p,
 
 		if (type == OBJ_BLOB && big_file_threshold <= size) {
 			/*
-			 * Let check_sha1_signature() check it with
+			 * Let check_object_signature() check it with
 			 * the streaming interface; no point slurping
 			 * the data in-core only to discard.
 			 */
@@ -141,7 +141,7 @@ static int verify_packfile(struct packed_git *p,
 			err = error("cannot unpack %s from %s at offset %"PRIuMAX"",
 				    oid_to_hex(entries[i].oid.oid), p->pack_name,
 				    (uintmax_t)entries[i].offset);
-		else if (check_sha1_signature(entries[i].oid.hash, data, size, typename(type)))
+		else if (check_object_signature(entries[i].oid.oid, data, size, typename(type)))
 			err = error("packed %s from %s is corrupt",
 				    oid_to_hex(entries[i].oid.oid), p->pack_name);
 		else if (fn) {
diff --git a/sha1_file.c b/sha1_file.c
index 69e8d27773..64f0905799 100644
--- a/sha1_file.c
+++ b/sha1_file.c
@@ -784,8 +784,8 @@ void *xmmap(void *start, size_t length,
  * With "map" == NULL, try reading the object named with "sha1" using
  * the streaming interface and rehash it to do the same.
  */
-int check_sha1_signature(const unsigned char *sha1, void *map,
-			 unsigned long size, const char *type)
+int check_object_signature(const struct object_id *oid, void *map,
+			   unsigned long size, const char *type)
 {
 	struct object_id real_oid;
 	enum object_type obj_type;
@@ -796,10 +796,10 @@ int check_sha1_signature(const unsigned char *sha1, void *map,
 
 	if (map) {
 		hash_object_file(map, size, type, &real_oid);
-		return hashcmp(sha1, real_oid.hash) ? -1 : 0;
+		return oidcmp(oid, &real_oid) ? -1 : 0;
 	}
 
-	st = open_istream(sha1, &obj_type, &size, NULL);
+	st = open_istream(oid->hash, &obj_type, &size, NULL);
 	if (!st)
 		return -1;
 
@@ -823,7 +823,7 @@ int check_sha1_signature(const unsigned char *sha1, void *map,
 	}
 	the_hash_algo->final_fn(real_oid.hash, &c);
 	close_istream(st);
-	return hashcmp(sha1, real_oid.hash) ? -1 : 0;
+	return oidcmp(oid, &real_oid) ? -1 : 0;
 }
 
 int git_open_cloexec(const char *name, int flags)
@@ -2217,7 +2217,7 @@ int read_loose_object(const char *path,
 			git_inflate_end(&stream);
 			goto out;
 		}
-		if (check_sha1_signature(expected_oid->hash, *contents,
+		if (check_object_signature(expected_oid, *contents,
 					 *size, typename(*type))) {
 			error("sha1 mismatch for %s (expected %s)", path,
 			      oid_to_hex(expected_oid));

[PATCH v2 20/36] streaming: convert open_istream to use struct object_id

[brian m. carlson]

Signed-off-by: brian m. carlson <sandals@crustytoothpaste.net>
---
 archive-tar.c          | 2 +-
 archive-zip.c          | 2 +-
 builtin/index-pack.c   | 2 +-
 builtin/pack-objects.c | 2 +-
 sha1_file.c            | 2 +-
 streaming.c            | 6 +++---
 streaming.h            | 2 +-
 7 files changed, 9 insertions(+), 9 deletions(-)

diff --git a/archive-tar.c b/archive-tar.c
index fd622eacc0..7a0d31d847 100644
--- a/archive-tar.c
+++ b/archive-tar.c
@@ -119,7 +119,7 @@ static int stream_blocked(const struct object_id *oid)
 	char buf[BLOCKSIZE];
 	ssize_t readlen;
 
-	st = open_istream(oid->hash, &type, &sz, NULL);
+	st = open_istream(oid, &type, &sz, NULL);
 	if (!st)
 		return error("cannot stream blob %s", oid_to_hex(oid));
 	for (;;) {
diff --git a/archive-zip.c b/archive-zip.c
index 5841a6ceb6..18b951b732 100644
--- a/archive-zip.c
+++ b/archive-zip.c
@@ -337,7 +337,7 @@ static int write_zip_entry(struct archiver_args *args,
 
 		if (S_ISREG(mode) && type == OBJ_BLOB && !args->convert &&
 		    size > big_file_threshold) {
-			stream = open_istream(oid->hash, &type, &size, NULL);
+			stream = open_istream(oid, &type, &size, NULL);
 			if (!stream)
 				return error("cannot stream blob %s",
 					     oid_to_hex(oid));
diff --git a/builtin/index-pack.c b/builtin/index-pack.c
index e0a776f1ac..a0ca525e99 100644
--- a/builtin/index-pack.c
+++ b/builtin/index-pack.c
@@ -771,7 +771,7 @@ static int check_collison(struct object_entry *entry)
 
 	memset(&data, 0, sizeof(data));
 	data.entry = entry;
-	data.st = open_istream(entry->idx.oid.hash, &type, &size, NULL);
+	data.st = open_istream(&entry->idx.oid, &type, &size, NULL);
 	if (!data.st)
 		return -1;
 	if (size != entry->size || type != entry->type)
diff --git a/builtin/pack-objects.c b/builtin/pack-objects.c
index 5c674b2843..ef63aa5878 100644
--- a/builtin/pack-objects.c
+++ b/builtin/pack-objects.c
@@ -267,7 +267,7 @@ static unsigned long write_no_reuse_object(struct hashfile *f, struct object_ent
 	if (!usable_delta) {
 		if (entry->type == OBJ_BLOB &&
 		    entry->size > big_file_threshold &&
-		    (st = open_istream(entry->idx.oid.hash, &type, &size, NULL)) != NULL)
+		    (st = open_istream(&entry->idx.oid, &type, &size, NULL)) != NULL)
 			buf = NULL;
 		else {
 			buf = read_sha1_file(entry->idx.oid.hash, &type,
diff --git a/sha1_file.c b/sha1_file.c
index 64f0905799..5dc85122c3 100644
--- a/sha1_file.c
+++ b/sha1_file.c
@@ -799,7 +799,7 @@ int check_object_signature(const struct object_id *oid, void *map,
 		return oidcmp(oid, &real_oid) ? -1 : 0;
 	}
 
-	st = open_istream(oid->hash, &obj_type, &size, NULL);
+	st = open_istream(oid, &obj_type, &size, NULL);
 	if (!st)
 		return -1;
 
diff --git a/streaming.c b/streaming.c
index 5892b50bd8..be85507922 100644
--- a/streaming.c
+++ b/streaming.c
@@ -130,14 +130,14 @@ static enum input_source istream_source(const unsigned char *sha1,
 	}
 }
 
-struct git_istream *open_istream(const unsigned char *sha1,
+struct git_istream *open_istream(const struct object_id *oid,
 				 enum object_type *type,
 				 unsigned long *size,
 				 struct stream_filter *filter)
 {
 	struct git_istream *st;
 	struct object_info oi = OBJECT_INFO_INIT;
-	const unsigned char *real = lookup_replace_object(sha1);
+	const unsigned char *real = lookup_replace_object(oid->hash);
 	enum input_source src = istream_source(real, type, &oi);
 
 	if (src < 0)
@@ -507,7 +507,7 @@ int stream_blob_to_fd(int fd, const struct object_id *oid, struct stream_filter
 	ssize_t kept = 0;
 	int result = -1;
 
-	st = open_istream(oid->hash, &type, &sz, filter);
+	st = open_istream(oid, &type, &sz, filter);
 	if (!st) {
 		if (filter)
 			free_stream_filter(filter);
diff --git a/streaming.h b/streaming.h
index 73c1d156b3..32f4626771 100644
--- a/streaming.h
+++ b/streaming.h
@@ -8,7 +8,7 @@
 /* opaque */
 struct git_istream;
 
-extern struct git_istream *open_istream(const unsigned char *, enum object_type *, unsigned long *, struct stream_filter *);
+extern struct git_istream *open_istream(const struct object_id *, enum object_type *, unsigned long *, struct stream_filter *);
 extern int close_istream(struct git_istream *);
 extern ssize_t read_istream(struct git_istream *, void *, size_t);
 

[PATCH v2 21/36] builtin/mktree: convert to struct object_id

[brian m. carlson]

Convert this file to use struct object_id.  Modify one use of
get_sha1_hex into parse_oid_hex; this is safe since we get the data from
a strbuf.

Signed-off-by: brian m. carlson <sandals@crustytoothpaste.net>
---
 builtin/mktree.c | 24 ++++++++++++------------
 1 file changed, 12 insertions(+), 12 deletions(-)

diff --git a/builtin/mktree.c b/builtin/mktree.c
index 8dd9f52f77..d6ca19d835 100644
--- a/builtin/mktree.c
+++ b/builtin/mktree.c
@@ -10,13 +10,13 @@
 
 static struct treeent {
 	unsigned mode;
-	unsigned char sha1[20];
+	struct object_id oid;
 	int len;
 	char name[FLEX_ARRAY];
 } **entries;
 static int alloc, used;
 
-static void append_to_tree(unsigned mode, unsigned char *sha1, char *path)
+static void append_to_tree(unsigned mode, struct object_id *oid, char *path)
 {
 	struct treeent *ent;
 	size_t len = strlen(path);
@@ -26,7 +26,7 @@ static void append_to_tree(unsigned mode, unsigned char *sha1, char *path)
 	FLEX_ALLOC_MEM(ent, name, path, len);
 	ent->mode = mode;
 	ent->len = len;
-	hashcpy(ent->sha1, sha1);
+	oidcpy(&ent->oid, oid);
 
 	ALLOC_GROW(entries, used + 1, alloc);
 	entries[used++] = ent;
@@ -54,7 +54,7 @@ static void write_tree(struct object_id *oid)
 	for (i = 0; i < used; i++) {
 		struct treeent *ent = entries[i];
 		strbuf_addf(&buf, "%o %s%c", ent->mode, ent->name, '\0');
-		strbuf_add(&buf, ent->sha1, 20);
+		strbuf_add(&buf, ent->oid.hash, the_hash_algo->rawsz);
 	}
 
 	write_object_file(buf.buf, buf.len, tree_type, oid);
@@ -69,11 +69,12 @@ static const char *mktree_usage[] = {
 static void mktree_line(char *buf, size_t len, int nul_term_line, int allow_missing)
 {
 	char *ptr, *ntr;
+	const char *p;
 	unsigned mode;
 	enum object_type mode_type; /* object type derived from mode */
 	enum object_type obj_type; /* object type derived from sha */
 	char *path, *to_free = NULL;
-	unsigned char sha1[20];
+	struct object_id oid;
 
 	ptr = buf;
 	/*
@@ -85,9 +86,8 @@ static void mktree_line(char *buf, size_t len, int nul_term_line, int allow_miss
 		die("input format error: %s", buf);
 	ptr = ntr + 1; /* type */
 	ntr = strchr(ptr, ' ');
-	if (!ntr || buf + len <= ntr + 40 ||
-	    ntr[41] != '\t' ||
-	    get_sha1_hex(ntr + 1, sha1))
+	if (!ntr || parse_oid_hex(ntr + 1, &oid, &p) ||
+	    *p != '\t')
 		die("input format error: %s", buf);
 
 	/* It is perfectly normal if we do not have a commit from a submodule */
@@ -116,12 +116,12 @@ static void mktree_line(char *buf, size_t len, int nul_term_line, int allow_miss
 	}
 
 	/* Check the type of object identified by sha1 */
-	obj_type = sha1_object_info(sha1, NULL);
+	obj_type = sha1_object_info(oid.hash, NULL);
 	if (obj_type < 0) {
 		if (allow_missing) {
 			; /* no problem - missing objects are presumed to be of the right type */
 		} else {
-			die("entry '%s' object %s is unavailable", path, sha1_to_hex(sha1));
+			die("entry '%s' object %s is unavailable", path, oid_to_hex(&oid));
 		}
 	} else {
 		if (obj_type != mode_type) {
@@ -131,11 +131,11 @@ static void mktree_line(char *buf, size_t len, int nul_term_line, int allow_miss
 			 * because the new tree entry will never be correct.
 			 */
 			die("entry '%s' object %s is a %s but specified type was (%s)",
-				path, sha1_to_hex(sha1), typename(obj_type), typename(mode_type));
+				path, oid_to_hex(&oid), typename(obj_type), typename(mode_type));
 		}
 	}
 
-	append_to_tree(mode, sha1, path);
+	append_to_tree(mode, &oid, path);
 	free(to_free);
 }
 

[PATCH v2 22/36] sha1_file: convert assert_sha1_type to object_id

[brian m. carlson]

Convert this function to take a pointer to struct object_id and rename
it to assert_oid_type.

Signed-off-by: brian m. carlson <sandals@crustytoothpaste.net>
---
 builtin/commit-tree.c | 2 +-
 cache.h               | 2 +-
 commit.c              | 2 +-
 sha1_file.c           | 8 ++++----
 4 files changed, 7 insertions(+), 7 deletions(-)

diff --git a/builtin/commit-tree.c b/builtin/commit-tree.c
index e5bdf57b1e..ecf42191da 100644
--- a/builtin/commit-tree.c
+++ b/builtin/commit-tree.c
@@ -58,7 +58,7 @@ int cmd_commit_tree(int argc, const char **argv, const char *prefix)
 				usage(commit_tree_usage);
 			if (get_oid_commit(argv[i], &oid))
 				die("Not a valid object name %s", argv[i]);
-			assert_sha1_type(oid.hash, OBJ_COMMIT);
+			assert_oid_type(&oid, OBJ_COMMIT);
 			new_parent(lookup_commit(&oid), &parents);
 			continue;
 		}
diff --git a/cache.h b/cache.h
index f29ff43bbd..b1a117e404 100644
--- a/cache.h
+++ b/cache.h
@@ -1275,7 +1275,7 @@ extern int has_object_file_with_flags(const struct object_id *oid, int flags);
  */
 extern int has_loose_object_nonlocal(const unsigned char *sha1);
 
-extern void assert_sha1_type(const unsigned char *sha1, enum object_type expect);
+extern void assert_oid_type(const struct object_id *oid, enum object_type expect);
 
 /* Helper to check and "touch" a file */
 extern int check_and_freshen_file(const char *fn, int freshen);
diff --git a/commit.c b/commit.c
index e8a49b9c84..b9f028976f 100644
--- a/commit.c
+++ b/commit.c
@@ -1517,7 +1517,7 @@ int commit_tree_extended(const char *msg, size_t msg_len,
 	int encoding_is_utf8;
 	struct strbuf buffer;
 
-	assert_sha1_type(tree->hash, OBJ_TREE);
+	assert_oid_type(tree, OBJ_TREE);
 
 	if (memchr(msg, '\0', msg_len))
 		return error("a NUL byte in commit log message not allowed.");
diff --git a/sha1_file.c b/sha1_file.c
index 5dc85122c3..fa69d86309 100644
--- a/sha1_file.c
+++ b/sha1_file.c
@@ -1966,13 +1966,13 @@ int read_pack_header(int fd, struct pack_header *header)
 	return 0;
 }
 
-void assert_sha1_type(const unsigned char *sha1, enum object_type expect)
+void assert_oid_type(const struct object_id *oid, enum object_type expect)
 {
-	enum object_type type = sha1_object_info(sha1, NULL);
+	enum object_type type = sha1_object_info(oid->hash, NULL);
 	if (type < 0)
-		die("%s is not a valid object", sha1_to_hex(sha1));
+		die("%s is not a valid object", oid_to_hex(oid));
 	if (type != expect)
-		die("%s is not a valid '%s' object", sha1_to_hex(sha1),
+		die("%s is not a valid '%s' object", oid_to_hex(oid),
 		    typename(expect));
 }
 

[PATCH v2 23/36] sha1_file: convert retry_bad_packed_offset to struct object_id

[brian m. carlson]

Signed-off-by: brian m. carlson <sandals@crustytoothpaste.net>
---
 packfile.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/packfile.c b/packfile.c
index 7dbe8739d1..954e1fca11 100644
--- a/packfile.c
+++ b/packfile.c
@@ -1095,13 +1095,13 @@ static int retry_bad_packed_offset(struct packed_git *p, off_t obj_offset)
 {
 	int type;
 	struct revindex_entry *revidx;
-	const unsigned char *sha1;
+	struct object_id oid;
 	revidx = find_pack_revindex(p, obj_offset);
 	if (!revidx)
 		return OBJ_BAD;
-	sha1 = nth_packed_object_sha1(p, revidx->nr);
-	mark_bad_packed_object(p, sha1);
-	type = sha1_object_info(sha1, NULL);
+	nth_packed_object_oid(&oid, p, revidx->nr);
+	mark_bad_packed_object(p, oid.hash);
+	type = sha1_object_info(oid.hash, NULL);
 	if (type <= OBJ_NONE)
 		return OBJ_BAD;
 	return type;

[PATCH v2 24/36] packfile: convert unpack_entry to struct object_id

[brian m. carlson]

Convert unpack_entry and read_object to use struct object_id.
---
 packfile.c | 22 +++++++++++-----------
 1 file changed, 11 insertions(+), 11 deletions(-)

diff --git a/packfile.c b/packfile.c
index 954e1fca11..e3b1db7dd5 100644
--- a/packfile.c
+++ b/packfile.c
@@ -1452,7 +1452,7 @@ struct unpack_entry_stack_ent {
 	unsigned long size;
 };
 
-static void *read_object(const unsigned char *sha1, enum object_type *type,
+static void *read_object(const struct object_id *oid, enum object_type *type,
 			 unsigned long *size)
 {
 	struct object_info oi = OBJECT_INFO_INIT;
@@ -1461,7 +1461,7 @@ static void *read_object(const unsigned char *sha1, enum object_type *type,
 	oi.sizep = size;
 	oi.contentp = &content;
 
-	if (sha1_object_info_extended(sha1, &oi, 0) < 0)
+	if (sha1_object_info_extended(oid->hash, &oi, 0) < 0)
 		return NULL;
 	return content;
 }
@@ -1501,11 +1501,11 @@ void *unpack_entry(struct packed_git *p, off_t obj_offset,
 			struct revindex_entry *revidx = find_pack_revindex(p, obj_offset);
 			off_t len = revidx[1].offset - obj_offset;
 			if (check_pack_crc(p, &w_curs, obj_offset, len, revidx->nr)) {
-				const unsigned char *sha1 =
-					nth_packed_object_sha1(p, revidx->nr);
+				struct object_id oid;
+				nth_packed_object_oid(&oid, p, revidx->nr);
 				error("bad packed object CRC for %s",
-				      sha1_to_hex(sha1));
-				mark_bad_packed_object(p, sha1);
+				      oid_to_hex(&oid));
+				mark_bad_packed_object(p, oid.hash);
 				data = NULL;
 				goto out;
 			}
@@ -1588,16 +1588,16 @@ void *unpack_entry(struct packed_git *p, off_t obj_offset,
 			 * of a corrupted pack, and is better than failing outright.
 			 */
 			struct revindex_entry *revidx;
-			const unsigned char *base_sha1;
+			struct object_id base_oid;
 			revidx = find_pack_revindex(p, obj_offset);
 			if (revidx) {
-				base_sha1 = nth_packed_object_sha1(p, revidx->nr);
+				nth_packed_object_oid(&base_oid, p, revidx->nr);
 				error("failed to read delta base object %s"
 				      " at offset %"PRIuMAX" from %s",
-				      sha1_to_hex(base_sha1), (uintmax_t)obj_offset,
+				      oid_to_hex(&base_oid), (uintmax_t)obj_offset,
 				      p->pack_name);
-				mark_bad_packed_object(p, base_sha1);
-				base = read_object(base_sha1, &type, &base_size);
+				mark_bad_packed_object(p, base_oid.hash);
+				base = read_object(&base_oid, &type, &base_size);
 				external_base = base;
 			}
 		}

[PATCH v2 25/36] Convert remaining callers of sha1_object_info_extended to object_id

[brian m. carlson]

Convert the remaining caller of sha1_object_info_extended to use struct
object_id.  Introduce temporaries, which will be removed later, since
there is a dependency loop between sha1_object_info_extended and
lookup_replace_object_extended.  This allows us to convert the code in a
piecemeal fashion instead of all at once.

Signed-off-by: brian m. carlson <sandals@crustytoothpaste.net>
---
 sha1_file.c | 14 +++++++++++---
 streaming.c |  5 ++++-
 2 files changed, 15 insertions(+), 4 deletions(-)

diff --git a/sha1_file.c b/sha1_file.c
index fa69d86309..19995766b6 100644
--- a/sha1_file.c
+++ b/sha1_file.c
@@ -1231,6 +1231,9 @@ int sha1_object_info_extended(const unsigned char *sha1, struct object_info *oi,
 				    lookup_replace_object(sha1) :
 				    sha1;
 	int already_retried = 0;
+	struct object_id realoid;
+
+	hashcpy(realoid.hash, real);
 
 	if (is_null_sha1(real))
 		return -1;
@@ -1295,7 +1298,7 @@ int sha1_object_info_extended(const unsigned char *sha1, struct object_info *oi,
 	rtype = packed_object_info(e.p, e.offset, oi);
 	if (rtype < 0) {
 		mark_bad_packed_object(e.p, real);
-		return sha1_object_info_extended(real, oi, 0);
+		return sha1_object_info_extended(realoid.hash, oi, 0);
 	} else if (oi->whence == OI_PACKED) {
 		oi->u.packed.offset = e.offset;
 		oi->u.packed.pack = e.p;
@@ -1323,13 +1326,16 @@ int sha1_object_info(const unsigned char *sha1, unsigned long *sizep)
 static void *read_object(const unsigned char *sha1, enum object_type *type,
 			 unsigned long *size)
 {
+	struct object_id oid;
 	struct object_info oi = OBJECT_INFO_INIT;
 	void *content;
 	oi.typep = type;
 	oi.sizep = size;
 	oi.contentp = &content;
 
-	if (sha1_object_info_extended(sha1, &oi, 0) < 0)
+	hashcpy(oid.hash, sha1);
+
+	if (sha1_object_info_extended(oid.hash, &oi, 0) < 0)
 		return NULL;
 	return content;
 }
@@ -1723,9 +1729,11 @@ int force_object_loose(const struct object_id *oid, time_t mtime)
 
 int has_sha1_file_with_flags(const unsigned char *sha1, int flags)
 {
+	struct object_id oid;
 	if (!startup_info->have_repository)
 		return 0;
-	return sha1_object_info_extended(sha1, NULL,
+	hashcpy(oid.hash, sha1);
+	return sha1_object_info_extended(oid.hash, NULL,
 					 flags | OBJECT_INFO_SKIP_CACHED) >= 0;
 }
 
diff --git a/streaming.c b/streaming.c
index be85507922..042d6082e8 100644
--- a/streaming.c
+++ b/streaming.c
@@ -111,10 +111,13 @@ static enum input_source istream_source(const unsigned char *sha1,
 {
 	unsigned long size;
 	int status;
+	struct object_id oid;
+
+	hashcpy(oid.hash, sha1);
 
 	oi->typep = type;
 	oi->sizep = &size;
-	status = sha1_object_info_extended(sha1, oi, 0);
+	status = sha1_object_info_extended(oid.hash, oi, 0);
 	if (status < 0)
 		return stream_error;
 

[PATCH v2 26/36] sha1_file: convert sha1_object_info* to object_id

[brian m. carlson]

Convert sha1_object_info and sha1_object_info_extended to take pointers
to struct object_id and rename them to use "oid" instead of "sha1" in
their names.  Update the declaration and definition and apply the
following semantic patch, plus the standard object_id transforms:

@@
expression E1, E2;
@@
- sha1_object_info(E1.hash, E2)
+ oid_object_info(&E1, E2)

@@
expression E1, E2;
@@
- sha1_object_info(E1->hash, E2)
+ oid_object_info(E1, E2)

@@
expression E1, E2, E3;
@@
- sha1_object_info_extended(E1.hash, E2, E3)
+ oid_object_info_extended(&E1, E2, E3)

@@
expression E1, E2, E3;
@@
- sha1_object_info_extended(E1->hash, E2, E3)
+ oid_object_info_extended(E1, E2, E3)
---
 archive-tar.c            |  2 +-
 archive-zip.c            |  2 +-
 blame.c                  |  4 ++--
 builtin/cat-file.c       | 14 +++++++-------
 builtin/fast-export.c    |  2 +-
 builtin/fetch.c          |  2 +-
 builtin/fsck.c           |  2 +-
 builtin/index-pack.c     |  4 ++--
 builtin/ls-tree.c        |  2 +-
 builtin/mktree.c         |  2 +-
 builtin/pack-objects.c   |  7 +++----
 builtin/prune.c          |  2 +-
 builtin/replace.c        | 10 +++++-----
 builtin/tag.c            |  4 ++--
 builtin/unpack-objects.c |  2 +-
 cache.h                  |  6 +++---
 diff.c                   |  2 +-
 fast-import.c            | 10 +++++-----
 list-objects-filter.c    |  2 +-
 object.c                 |  2 +-
 pack-bitmap-write.c      |  3 +--
 packfile.c               |  4 ++--
 reachable.c              |  2 +-
 refs.c                   |  2 +-
 remote.c                 |  2 +-
 sequencer.c              |  3 ++-
 sha1_file.c              | 22 +++++++++++-----------
 sha1_name.c              | 12 ++++++------
 streaming.c              |  2 +-
 submodule.c              |  2 +-
 tag.c                    |  2 +-
 31 files changed, 69 insertions(+), 70 deletions(-)

diff --git a/archive-tar.c b/archive-tar.c
index 7a0d31d847..3563bcb9f2 100644
--- a/archive-tar.c
+++ b/archive-tar.c
@@ -276,7 +276,7 @@ static int write_tar_entry(struct archiver_args *args,
 		memcpy(header.name, path, pathlen);
 
 	if (S_ISREG(mode) && !args->convert &&
-	    sha1_object_info(oid->hash, &size) == OBJ_BLOB &&
+	    oid_object_info(oid, &size) == OBJ_BLOB &&
 	    size > big_file_threshold)
 		buffer = NULL;
 	else if (S_ISLNK(mode) || S_ISREG(mode)) {
diff --git a/archive-zip.c b/archive-zip.c
index 18b951b732..6b20bce4d1 100644
--- a/archive-zip.c
+++ b/archive-zip.c
@@ -325,7 +325,7 @@ static int write_zip_entry(struct archiver_args *args,
 		compressed_size = 0;
 		buffer = NULL;
 	} else if (S_ISREG(mode) || S_ISLNK(mode)) {
-		enum object_type type = sha1_object_info(oid->hash, &size);
+		enum object_type type = oid_object_info(oid, &size);
 
 		method = 0;
 		attr2 = S_ISLNK(mode) ? ((mode | 0777) << 16) :
diff --git a/blame.c b/blame.c
index 1fc22b304b..c1df10cdd2 100644
--- a/blame.c
+++ b/blame.c
@@ -81,7 +81,7 @@ static void verify_working_tree_path(struct commit *work_tree, const char *path)
 		unsigned mode;
 
 		if (!get_tree_entry(commit_oid->hash, path, blob_oid.hash, &mode) &&
-		    sha1_object_info(blob_oid.hash, NULL) == OBJ_BLOB)
+		    oid_object_info(&blob_oid, NULL) == OBJ_BLOB)
 			return;
 	}
 
@@ -506,7 +506,7 @@ static int fill_blob_sha1_and_mode(struct blame_origin *origin)
 			   origin->path,
 			   origin->blob_oid.hash, &origin->mode))
 		goto error_out;
-	if (sha1_object_info(origin->blob_oid.hash, NULL) != OBJ_BLOB)
+	if (oid_object_info(&origin->blob_oid, NULL) != OBJ_BLOB)
 		goto error_out;
 	return 0;
  error_out:
diff --git a/builtin/cat-file.c b/builtin/cat-file.c
index cf9ea5c796..3264bada39 100644
--- a/builtin/cat-file.c
+++ b/builtin/cat-file.c
@@ -77,7 +77,7 @@ static int cat_one_file(int opt, const char *exp_type, const char *obj_name,
 	switch (opt) {
 	case 't':
 		oi.typename = &sb;
-		if (sha1_object_info_extended(oid.hash, &oi, flags) < 0)
+		if (oid_object_info_extended(&oid, &oi, flags) < 0)
 			die("git cat-file: could not get object info");
 		if (sb.len) {
 			printf("%s\n", sb.buf);
@@ -88,7 +88,7 @@ static int cat_one_file(int opt, const char *exp_type, const char *obj_name,
 
 	case 's':
 		oi.sizep = &size;
-		if (sha1_object_info_extended(oid.hash, &oi, flags) < 0)
+		if (oid_object_info_extended(&oid, &oi, flags) < 0)
 			die("git cat-file: could not get object info");
 		printf("%lu\n", size);
 		return 0;
@@ -116,7 +116,7 @@ static int cat_one_file(int opt, const char *exp_type, const char *obj_name,
 		/* else fallthrough */
 
 	case 'p':
-		type = sha1_object_info(oid.hash, NULL);
+		type = oid_object_info(&oid, NULL);
 		if (type < 0)
 			die("Not a valid object name %s", obj_name);
 
@@ -140,7 +140,7 @@ static int cat_one_file(int opt, const char *exp_type, const char *obj_name,
 	case 0:
 		if (type_from_string(exp_type) == OBJ_BLOB) {
 			struct object_id blob_oid;
-			if (sha1_object_info(oid.hash, NULL) == OBJ_TAG) {
+			if (oid_object_info(&oid, NULL) == OBJ_TAG) {
 				char *buffer = read_sha1_file(oid.hash, &type, &size);
 				const char *target;
 				if (!skip_prefix(buffer, "object ", &target) ||
@@ -150,7 +150,7 @@ static int cat_one_file(int opt, const char *exp_type, const char *obj_name,
 			} else
 				oidcpy(&blob_oid, &oid);
 
-			if (sha1_object_info(blob_oid.hash, NULL) == OBJ_BLOB)
+			if (oid_object_info(&blob_oid, NULL) == OBJ_BLOB)
 				return stream_blob_to_fd(1, &blob_oid, NULL, 0);
 			/*
 			 * we attempted to dereference a tag to a blob
@@ -340,8 +340,8 @@ static void batch_object_write(const char *obj_name, struct batch_options *opt,
 	struct strbuf buf = STRBUF_INIT;
 
 	if (!data->skip_object_info &&
-	    sha1_object_info_extended(data->oid.hash, &data->info,
-				      OBJECT_INFO_LOOKUP_REPLACE) < 0) {
+	    oid_object_info_extended(&data->oid, &data->info,
+				     OBJECT_INFO_LOOKUP_REPLACE) < 0) {
 		printf("%s missing\n",
 		       obj_name ? obj_name : oid_to_hex(&data->oid));
 		fflush(stdout);
diff --git a/builtin/fast-export.c b/builtin/fast-export.c
index 293a6615fa..02ec19060d 100644
--- a/builtin/fast-export.c
+++ b/builtin/fast-export.c
@@ -947,7 +947,7 @@ static void import_marks(char *input_file)
 		if (last_idnum < mark)
 			last_idnum = mark;
 
-		type = sha1_object_info(oid.hash, NULL);
+		type = oid_object_info(&oid, NULL);
 		if (type < 0)
 			die("object not found: %s", oid_to_hex(&oid));
 
diff --git a/builtin/fetch.c b/builtin/fetch.c
index 3b8988e51d..81076d698c 100644
--- a/builtin/fetch.c
+++ b/builtin/fetch.c
@@ -626,7 +626,7 @@ static int update_local_ref(struct ref *ref,
 	struct branch *current_branch = branch_get(NULL);
 	const char *pretty_ref = prettify_refname(ref->name);
 
-	type = sha1_object_info(ref->new_oid.hash, NULL);
+	type = oid_object_info(&ref->new_oid, NULL);
 	if (type < 0)
 		die(_("object %s not found"), oid_to_hex(&ref->new_oid));
 
diff --git a/builtin/fsck.c b/builtin/fsck.c
index 57509a4eac..e57621cf74 100644
--- a/builtin/fsck.c
+++ b/builtin/fsck.c
@@ -65,7 +65,7 @@ static const char *printable_type(struct object *obj)
 	const char *ret;
 
 	if (obj->type == OBJ_NONE) {
-		enum object_type type = sha1_object_info(obj->oid.hash, NULL);
+		enum object_type type = oid_object_info(&obj->oid, NULL);
 		if (type > 0)
 			object_as_type(obj, type, 0);
 	}
diff --git a/builtin/index-pack.c b/builtin/index-pack.c
index a0ca525e99..27aa50396b 100644
--- a/builtin/index-pack.c
+++ b/builtin/index-pack.c
@@ -221,7 +221,7 @@ static unsigned check_object(struct object *obj)
 
 	if (!(obj->flags & FLAG_CHECKED)) {
 		unsigned long size;
-		int type = sha1_object_info(obj->oid.hash, &size);
+		int type = oid_object_info(&obj->oid, &size);
 		if (type <= 0)
 			die(_("did not receive expected object %s"),
 			      oid_to_hex(&obj->oid));
@@ -810,7 +810,7 @@ static void sha1_object(const void *data, struct object_entry *obj_entry,
 		enum object_type has_type;
 		unsigned long has_size;
 		read_lock();
-		has_type = sha1_object_info(oid->hash, &has_size);
+		has_type = oid_object_info(oid, &has_size);
 		if (has_type < 0)
 			die(_("cannot read existing object info %s"), oid_to_hex(oid));
 		if (has_type != type || has_size != size)
diff --git a/builtin/ls-tree.c b/builtin/ls-tree.c
index c98253adbb..d44b4f9c27 100644
--- a/builtin/ls-tree.c
+++ b/builtin/ls-tree.c
@@ -94,7 +94,7 @@ static int show_tree(const struct object_id *oid, struct strbuf *base,
 			char size_text[24];
 			if (!strcmp(type, blob_type)) {
 				unsigned long size;
-				if (sha1_object_info(oid->hash, &size) == OBJ_BAD)
+				if (oid_object_info(oid, &size) == OBJ_BAD)
 					xsnprintf(size_text, sizeof(size_text),
 						  "BAD");
 				else
diff --git a/builtin/mktree.c b/builtin/mktree.c
index d6ca19d835..298ad6665a 100644
--- a/builtin/mktree.c
+++ b/builtin/mktree.c
@@ -116,7 +116,7 @@ static void mktree_line(char *buf, size_t len, int nul_term_line, int allow_miss
 	}
 
 	/* Check the type of object identified by sha1 */
-	obj_type = sha1_object_info(oid.hash, NULL);
+	obj_type = oid_object_info(&oid, NULL);
 	if (obj_type < 0) {
 		if (allow_missing) {
 			; /* no problem - missing objects are presumed to be of the right type */
diff --git a/builtin/pack-objects.c b/builtin/pack-objects.c
index ef63aa5878..f8148eb9d5 100644
--- a/builtin/pack-objects.c
+++ b/builtin/pack-objects.c
@@ -1516,7 +1516,7 @@ static void check_object(struct object_entry *entry)
 		unuse_pack(&w_curs);
 	}
 
-	entry->type = sha1_object_info(entry->idx.oid.hash, &entry->size);
+	entry->type = oid_object_info(&entry->idx.oid, &entry->size);
 	/*
 	 * The error condition is checked in prepare_pack().  This is
 	 * to permit a missing preferred base object to be ignored
@@ -1578,8 +1578,7 @@ static void drop_reused_delta(struct object_entry *entry)
 		 * And if that fails, the error will be recorded in entry->type
 		 * and dealt with in prepare_pack().
 		 */
-		entry->type = sha1_object_info(entry->idx.oid.hash,
-					       &entry->size);
+		entry->type = oid_object_info(&entry->idx.oid, &entry->size);
 	}
 }
 
@@ -2708,7 +2707,7 @@ static void add_objects_in_unpacked_packs(struct rev_info *revs)
 static int add_loose_object(const struct object_id *oid, const char *path,
 			    void *data)
 {
-	enum object_type type = sha1_object_info(oid->hash, NULL);
+	enum object_type type = oid_object_info(oid, NULL);
 
 	if (type < 0) {
 		warning("loose object at %s could not be examined", path);
diff --git a/builtin/prune.c b/builtin/prune.c
index 4cfec82f40..f77a4a4379 100644
--- a/builtin/prune.c
+++ b/builtin/prune.c
@@ -50,7 +50,7 @@ static int prune_object(const struct object_id *oid, const char *fullpath,
 	if (st.st_mtime > expire)
 		return 0;
 	if (show_only || verbose) {
-		enum object_type type = sha1_object_info(oid->hash, NULL);
+		enum object_type type = oid_object_info(oid, NULL);
 		printf("%s %s\n", oid_to_hex(oid),
 		       (type > 0) ? typename(type) : "unknown");
 	}
diff --git a/builtin/replace.c b/builtin/replace.c
index 83d3235721..1fa40039b4 100644
--- a/builtin/replace.c
+++ b/builtin/replace.c
@@ -53,8 +53,8 @@ static int show_reference(const char *refname, const struct object_id *oid,
 			if (get_oid(refname, &object))
 				return error("Failed to resolve '%s' as a valid ref.", refname);
 
-			obj_type = sha1_object_info(object.hash, NULL);
-			repl_type = sha1_object_info(oid->hash, NULL);
+			obj_type = oid_object_info(&object, NULL);
+			repl_type = oid_object_info(oid, NULL);
 
 			printf("%s (%s) -> %s (%s)\n", refname, typename(obj_type),
 			       oid_to_hex(oid), typename(repl_type));
@@ -162,8 +162,8 @@ static int replace_object_oid(const char *object_ref,
 	struct ref_transaction *transaction;
 	struct strbuf err = STRBUF_INIT;
 
-	obj_type = sha1_object_info(object->hash, NULL);
-	repl_type = sha1_object_info(repl->hash, NULL);
+	obj_type = oid_object_info(object, NULL);
+	repl_type = oid_object_info(repl, NULL);
 	if (!force && obj_type != repl_type)
 		die("Objects must be of the same type.\n"
 		    "'%s' points to a replaced object of type '%s'\n"
@@ -290,7 +290,7 @@ static int edit_and_replace(const char *object_ref, int force, int raw)
 	if (get_oid(object_ref, &old) < 0)
 		die("Not a valid object name: '%s'", object_ref);
 
-	type = sha1_object_info(old.hash, NULL);
+	type = oid_object_info(&old, NULL);
 	if (type < 0)
 		die("unable to get object type for %s", oid_to_hex(&old));
 
diff --git a/builtin/tag.c b/builtin/tag.c
index 17d6bc0836..3340cbedd4 100644
--- a/builtin/tag.c
+++ b/builtin/tag.c
@@ -211,7 +211,7 @@ static void create_tag(const struct object_id *object, const char *tag,
 	struct strbuf header = STRBUF_INIT;
 	char *path = NULL;
 
-	type = sha1_object_info(object->hash, NULL);
+	type = oid_object_info(object, NULL);
 	if (type <= OBJ_NONE)
 	    die(_("bad object type."));
 
@@ -294,7 +294,7 @@ static void create_reflog_msg(const struct object_id *oid, struct strbuf *sb)
 	}
 
 	strbuf_addstr(sb, " (");
-	type = sha1_object_info(oid->hash, NULL);
+	type = oid_object_info(oid, NULL);
 	switch (type) {
 	default:
 		strbuf_addstr(sb, "object of unknown type");
diff --git a/builtin/unpack-objects.c b/builtin/unpack-objects.c
index 7235d2ffbf..6e712081e0 100644
--- a/builtin/unpack-objects.c
+++ b/builtin/unpack-objects.c
@@ -198,7 +198,7 @@ static int check_object(struct object *obj, int type, void *data, struct fsck_op
 
 	if (!(obj->flags & FLAG_OPEN)) {
 		unsigned long size;
-		int type = sha1_object_info(obj->oid.hash, &size);
+		int type = oid_object_info(&obj->oid, &size);
 		if (type != obj->type || type <= 0)
 			die("object of unexpected type");
 		obj->flags |= FLAG_WRITTEN;
diff --git a/cache.h b/cache.h
index b1a117e404..b965a073f2 100644
--- a/cache.h
+++ b/cache.h
@@ -1212,8 +1212,8 @@ static inline const unsigned char *lookup_replace_object(const unsigned char *sh
 	return do_lookup_replace_object(sha1);
 }
 
-/* Read and unpack a sha1 file into memory, write memory to a sha1 file */
-extern int sha1_object_info(const unsigned char *, unsigned long *);
+/* Read and unpack an object file into memory, write memory to an object file */
+extern int oid_object_info(const struct object_id *, unsigned long *);
 
 extern int hash_object_file(const void *buf, unsigned long len,
 			    const char *type, struct object_id *oid);
@@ -1773,7 +1773,7 @@ struct object_info {
 #define OBJECT_INFO_SKIP_CACHED 4
 /* Do not retry packed storage after checking packed and loose storage */
 #define OBJECT_INFO_QUICK 8
-extern int sha1_object_info_extended(const unsigned char *, struct object_info *, unsigned flags);
+extern int oid_object_info_extended(const struct object_id *, struct object_info *, unsigned flags);
 
 /*
  * Set this to 0 to prevent sha1_object_info_extended() from fetching missing
diff --git a/diff.c b/diff.c
index 94117bcbbf..d838ee2e9a 100644
--- a/diff.c
+++ b/diff.c
@@ -3615,7 +3615,7 @@ int diff_populate_filespec(struct diff_filespec *s, unsigned int flags)
 	else {
 		enum object_type type;
 		if (size_only || (flags & CHECK_BINARY)) {
-			type = sha1_object_info(s->oid.hash, &s->size);
+			type = oid_object_info(&s->oid, &s->size);
 			if (type < 0)
 				die("unable to read %s",
 				    oid_to_hex(&s->oid));
diff --git a/fast-import.c b/fast-import.c
index 0f818cd932..71b60f9068 100644
--- a/fast-import.c
+++ b/fast-import.c
@@ -1913,7 +1913,7 @@ static void read_marks(void)
 			die("corrupt mark line: %s", line);
 		e = find_object(&oid);
 		if (!e) {
-			enum object_type type = sha1_object_info(oid.hash, NULL);
+			enum object_type type = oid_object_info(&oid, NULL);
 			if (type < 0)
 				die("object not found: %s", oid_to_hex(&oid));
 			e = insert_object(&oid);
@@ -2443,7 +2443,7 @@ static void file_change_m(const char *p, struct branch *b)
 		enum object_type expected = S_ISDIR(mode) ?
 						OBJ_TREE: OBJ_BLOB;
 		enum object_type type = oe ? oe->type :
-					sha1_object_info(oid.hash, NULL);
+					oid_object_info(&oid, NULL);
 		if (type < 0)
 			die("%s not found: %s",
 					S_ISDIR(mode) ?  "Tree" : "Blob",
@@ -2603,7 +2603,7 @@ static void note_change_n(const char *p, struct branch *b, unsigned char *old_fa
 			die("Not a blob (actually a %s): %s",
 				typename(oe->type), command_buf.buf);
 	} else if (!is_null_oid(&oid)) {
-		enum object_type type = sha1_object_info(oid.hash, NULL);
+		enum object_type type = oid_object_info(&oid, NULL);
 		if (type < 0)
 			die("Blob not found: %s", command_buf.buf);
 		if (type != OBJ_BLOB)
@@ -2890,7 +2890,7 @@ static void parse_new_tag(const char *arg)
 	} else if (!get_oid(from, &oid)) {
 		struct object_entry *oe = find_object(&oid);
 		if (!oe) {
-			type = sha1_object_info(oid.hash, NULL);
+			type = oid_object_info(&oid, NULL);
 			if (type < 0)
 				die("Not a valid object: %s", from);
 		} else
@@ -3048,7 +3048,7 @@ static struct object_entry *dereference(struct object_entry *oe,
 	unsigned long size;
 	char *buf = NULL;
 	if (!oe) {
-		enum object_type type = sha1_object_info(oid->hash, NULL);
+		enum object_type type = oid_object_info(oid, NULL);
 		if (type < 0)
 			die("object not found: %s", oid_to_hex(oid));
 		/* cache it! */
diff --git a/list-objects-filter.c b/list-objects-filter.c
index 4356c45368..0ec83aaf18 100644
--- a/list-objects-filter.c
+++ b/list-objects-filter.c
@@ -117,7 +117,7 @@ static enum list_objects_filter_result filter_blobs_limit(
 		assert(obj->type == OBJ_BLOB);
 		assert((obj->flags & SEEN) == 0);
 
-		t = sha1_object_info(obj->oid.hash, &object_length);
+		t = oid_object_info(&obj->oid, &object_length);
 		if (t != OBJ_BLOB) { /* probably OBJ_NONE */
 			/*
 			 * We DO NOT have the blob locally, so we cannot
diff --git a/object.c b/object.c
index c63f02a40f..be8f23271b 100644
--- a/object.c
+++ b/object.c
@@ -254,7 +254,7 @@ struct object *parse_object(const struct object_id *oid)
 
 	if ((obj && obj->type == OBJ_BLOB && has_object_file(oid)) ||
 	    (!obj && has_object_file(oid) &&
-	     sha1_object_info(oid->hash, NULL) == OBJ_BLOB)) {
+	     oid_object_info(oid, NULL) == OBJ_BLOB)) {
 		struct object_id reploid;
 		hashcpy(reploid.hash, repl);
 
diff --git a/pack-bitmap-write.c b/pack-bitmap-write.c
index e01f992884..41ae27fb19 100644
--- a/pack-bitmap-write.c
+++ b/pack-bitmap-write.c
@@ -73,8 +73,7 @@ void bitmap_writer_build_type_index(struct pack_idx_entry **index,
 			break;
 
 		default:
-			real_type = sha1_object_info(entry->idx.oid.hash,
-						     NULL);
+			real_type = oid_object_info(&entry->idx.oid, NULL);
 			break;
 		}
 
diff --git a/packfile.c b/packfile.c
index e3b1db7dd5..6619813756 100644
--- a/packfile.c
+++ b/packfile.c
@@ -1101,7 +1101,7 @@ static int retry_bad_packed_offset(struct packed_git *p, off_t obj_offset)
 		return OBJ_BAD;
 	nth_packed_object_oid(&oid, p, revidx->nr);
 	mark_bad_packed_object(p, oid.hash);
-	type = sha1_object_info(oid.hash, NULL);
+	type = oid_object_info(&oid, NULL);
 	if (type <= OBJ_NONE)
 		return OBJ_BAD;
 	return type;
@@ -1461,7 +1461,7 @@ static void *read_object(const struct object_id *oid, enum object_type *type,
 	oi.sizep = size;
 	oi.contentp = &content;
 
-	if (sha1_object_info_extended(oid->hash, &oi, 0) < 0)
+	if (oid_object_info_extended(oid, &oi, 0) < 0)
 		return NULL;
 	return content;
 }
diff --git a/reachable.c b/reachable.c
index 88d7d679da..44c9c0f92c 100644
--- a/reachable.c
+++ b/reachable.c
@@ -77,7 +77,7 @@ static void add_recent_object(const struct object_id *oid,
 	 * later processing, and the revision machinery expects
 	 * commits and tags to have been parsed.
 	 */
-	type = sha1_object_info(oid->hash, NULL);
+	type = oid_object_info(oid, NULL);
 	if (type < 0)
 		die("unable to get object info for %s", oid_to_hex(oid));
 
diff --git a/refs.c b/refs.c
index 20ba82b434..8b7a77fe5e 100644
--- a/refs.c
+++ b/refs.c
@@ -301,7 +301,7 @@ enum peel_status peel_object(const struct object_id *name, struct object_id *oid
 	struct object *o = lookup_unknown_object(name->hash);
 
 	if (o->type == OBJ_NONE) {
-		int type = sha1_object_info(name->hash, NULL);
+		int type = oid_object_info(name, NULL);
 		if (type < 0 || !object_as_type(o, type, 0))
 			return PEEL_INVALID;
 	}
diff --git a/remote.c b/remote.c
index 4e93753e19..619ce28a58 100644
--- a/remote.c
+++ b/remote.c
@@ -1361,7 +1361,7 @@ static void add_missing_tags(struct ref *src, struct ref **dst, struct ref ***ds
 			continue; /* not a tag */
 		if (string_list_has_string(&dst_tag, ref->name))
 			continue; /* they already have it */
-		if (sha1_object_info(ref->new_oid.hash, NULL) != OBJ_TAG)
+		if (oid_object_info(&ref->new_oid, NULL) != OBJ_TAG)
 			continue; /* be conservative */
 		item = string_list_append(&src_tag, ref->name);
 		item->util = ref;
diff --git a/sequencer.c b/sequencer.c
index ed7c42ba7d..604f3162ed 100644
--- a/sequencer.c
+++ b/sequencer.c
@@ -2868,7 +2868,8 @@ int sequencer_pick_revisions(struct replay_opts *opts)
 
 		if (!get_oid(name, &oid)) {
 			if (!lookup_commit_reference_gently(&oid, 1)) {
-				enum object_type type = sha1_object_info(oid.hash, NULL);
+				enum object_type type = oid_object_info(&oid,
+									NULL);
 				return error(_("%s: can't cherry-pick a %s"),
 					name, typename(type));
 			}
diff --git a/sha1_file.c b/sha1_file.c
index 19995766b6..1719c218e2 100644
--- a/sha1_file.c
+++ b/sha1_file.c
@@ -1222,14 +1222,14 @@ static int sha1_loose_object_info(const unsigned char *sha1,
 
 int fetch_if_missing = 1;
 
-int sha1_object_info_extended(const unsigned char *sha1, struct object_info *oi, unsigned flags)
+int oid_object_info_extended(const struct object_id *oid, struct object_info *oi, unsigned flags)
 {
 	static struct object_info blank_oi = OBJECT_INFO_INIT;
 	struct pack_entry e;
 	int rtype;
 	const unsigned char *real = (flags & OBJECT_INFO_LOOKUP_REPLACE) ?
-				    lookup_replace_object(sha1) :
-				    sha1;
+				    lookup_replace_object(oid->hash) :
+				    oid->hash;
 	int already_retried = 0;
 	struct object_id realoid;
 
@@ -1298,7 +1298,7 @@ int sha1_object_info_extended(const unsigned char *sha1, struct object_info *oi,
 	rtype = packed_object_info(e.p, e.offset, oi);
 	if (rtype < 0) {
 		mark_bad_packed_object(e.p, real);
-		return sha1_object_info_extended(realoid.hash, oi, 0);
+		return oid_object_info_extended(&realoid, oi, 0);
 	} else if (oi->whence == OI_PACKED) {
 		oi->u.packed.offset = e.offset;
 		oi->u.packed.pack = e.p;
@@ -1310,15 +1310,15 @@ int sha1_object_info_extended(const unsigned char *sha1, struct object_info *oi,
 }
 
 /* returns enum object_type or negative */
-int sha1_object_info(const unsigned char *sha1, unsigned long *sizep)
+int oid_object_info(const struct object_id *oid, unsigned long *sizep)
 {
 	enum object_type type;
 	struct object_info oi = OBJECT_INFO_INIT;
 
 	oi.typep = &type;
 	oi.sizep = sizep;
-	if (sha1_object_info_extended(sha1, &oi,
-				      OBJECT_INFO_LOOKUP_REPLACE) < 0)
+	if (oid_object_info_extended(oid, &oi,
+				     OBJECT_INFO_LOOKUP_REPLACE) < 0)
 		return -1;
 	return type;
 }
@@ -1335,7 +1335,7 @@ static void *read_object(const unsigned char *sha1, enum object_type *type,
 
 	hashcpy(oid.hash, sha1);
 
-	if (sha1_object_info_extended(oid.hash, &oi, 0) < 0)
+	if (oid_object_info_extended(&oid, &oi, 0) < 0)
 		return NULL;
 	return content;
 }
@@ -1733,8 +1733,8 @@ int has_sha1_file_with_flags(const unsigned char *sha1, int flags)
 	if (!startup_info->have_repository)
 		return 0;
 	hashcpy(oid.hash, sha1);
-	return sha1_object_info_extended(oid.hash, NULL,
-					 flags | OBJECT_INFO_SKIP_CACHED) >= 0;
+	return oid_object_info_extended(&oid, NULL,
+					flags | OBJECT_INFO_SKIP_CACHED) >= 0;
 }
 
 int has_object_file(const struct object_id *oid)
@@ -1976,7 +1976,7 @@ int read_pack_header(int fd, struct pack_header *header)
 
 void assert_oid_type(const struct object_id *oid, enum object_type expect)
 {
-	enum object_type type = sha1_object_info(oid->hash, NULL);
+	enum object_type type = oid_object_info(oid, NULL);
 	if (type < 0)
 		die("%s is not a valid object", oid_to_hex(oid));
 	if (type != expect)
diff --git a/sha1_name.c b/sha1_name.c
index dd68e68f45..6d4c6033c8 100644
--- a/sha1_name.c
+++ b/sha1_name.c
@@ -238,7 +238,7 @@ static int finish_object_disambiguation(struct disambiguate_state *ds,
 
 static int disambiguate_commit_only(const struct object_id *oid, void *cb_data_unused)
 {
-	int kind = sha1_object_info(oid->hash, NULL);
+	int kind = oid_object_info(oid, NULL);
 	return kind == OBJ_COMMIT;
 }
 
@@ -247,7 +247,7 @@ static int disambiguate_committish_only(const struct object_id *oid, void *cb_da
 	struct object *obj;
 	int kind;
 
-	kind = sha1_object_info(oid->hash, NULL);
+	kind = oid_object_info(oid, NULL);
 	if (kind == OBJ_COMMIT)
 		return 1;
 	if (kind != OBJ_TAG)
@@ -262,7 +262,7 @@ static int disambiguate_committish_only(const struct object_id *oid, void *cb_da
 
 static int disambiguate_tree_only(const struct object_id *oid, void *cb_data_unused)
 {
-	int kind = sha1_object_info(oid->hash, NULL);
+	int kind = oid_object_info(oid, NULL);
 	return kind == OBJ_TREE;
 }
 
@@ -271,7 +271,7 @@ static int disambiguate_treeish_only(const struct object_id *oid, void *cb_data_
 	struct object *obj;
 	int kind;
 
-	kind = sha1_object_info(oid->hash, NULL);
+	kind = oid_object_info(oid, NULL);
 	if (kind == OBJ_TREE || kind == OBJ_COMMIT)
 		return 1;
 	if (kind != OBJ_TAG)
@@ -286,7 +286,7 @@ static int disambiguate_treeish_only(const struct object_id *oid, void *cb_data_
 
 static int disambiguate_blob_only(const struct object_id *oid, void *cb_data_unused)
 {
-	int kind = sha1_object_info(oid->hash, NULL);
+	int kind = oid_object_info(oid, NULL);
 	return kind == OBJ_BLOB;
 }
 
@@ -365,7 +365,7 @@ static int show_ambiguous_object(const struct object_id *oid, void *data)
 	if (ds->fn && !ds->fn(oid, ds->cb_data))
 		return 0;
 
-	type = sha1_object_info(oid->hash, NULL);
+	type = oid_object_info(oid, NULL);
 	if (type == OBJ_COMMIT) {
 		struct commit *commit = lookup_commit(oid);
 		if (commit) {
diff --git a/streaming.c b/streaming.c
index 042d6082e8..344678e95f 100644
--- a/streaming.c
+++ b/streaming.c
@@ -117,7 +117,7 @@ static enum input_source istream_source(const unsigned char *sha1,
 
 	oi->typep = type;
 	oi->sizep = &size;
-	status = sha1_object_info_extended(oid.hash, oi, 0);
+	status = oid_object_info_extended(&oid, oi, 0);
 	if (status < 0)
 		return stream_error;
 
diff --git a/submodule.c b/submodule.c
index d4a482e647..a2c89224a9 100644
--- a/submodule.c
+++ b/submodule.c
@@ -817,7 +817,7 @@ static int check_has_commit(const struct object_id *oid, void *data)
 {
 	struct has_commit_data *cb = data;
 
-	enum object_type type = sha1_object_info(oid->hash, NULL);
+	enum object_type type = oid_object_info(oid, NULL);
 
 	switch (type) {
 	case OBJ_COMMIT:
diff --git a/tag.c b/tag.c
index 0b63c3f1ec..ea963e406a 100644
--- a/tag.c
+++ b/tag.c
@@ -41,7 +41,7 @@ int gpg_verify_tag(const struct object_id *oid, const char *name_to_report,
 	unsigned long size;
 	int ret;
 
-	type = sha1_object_info(oid->hash, NULL);
+	type = oid_object_info(oid, NULL);
 	if (type != OBJ_TAG)
 		return error("%s: cannot verify a non-tag object of type %s.",
 				name_to_report ?

[PATCH v2 27/36] builtin/fmt-merge-msg: convert remaining code to object_id

[brian m. carlson]

We were using the util pointer, which is a pointer to void, as an
unsigned char pointer.  The pointer actually points to a struct
origin_data, which has a struct object_id as its first member, which in
turn has an unsigned char array as its first member, so this was valid.
Since we want to convert this to struct object_id, simply change the
pointer we're using.

Signed-off-by: brian m. carlson <sandals@crustytoothpaste.net>
---
 builtin/fmt-merge-msg.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/builtin/fmt-merge-msg.c b/builtin/fmt-merge-msg.c
index 8e8a15ea4a..0bc0dda99c 100644
--- a/builtin/fmt-merge-msg.c
+++ b/builtin/fmt-merge-msg.c
@@ -485,10 +485,10 @@ static void fmt_merge_msg_sigs(struct strbuf *out)
 	struct strbuf tagbuf = STRBUF_INIT;
 
 	for (i = 0; i < origins.nr; i++) {
-		unsigned char *sha1 = origins.items[i].util;
+		struct object_id *oid = origins.items[i].util;
 		enum object_type type;
 		unsigned long size, len;
-		char *buf = read_sha1_file(sha1, &type, &size);
+		char *buf = read_sha1_file(oid->hash, &type, &size);
 		struct strbuf sig = STRBUF_INIT;
 
 		if (!buf || type != OBJ_TAG)

[PATCH v2 28/36] builtin/notes: convert static functions to object_id

[brian m. carlson]

Convert the remaining static functions to take pointers to struct
object_id.

Signed-off-by: brian m. carlson <sandals@crustytoothpaste.net>
---
 builtin/notes.c | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/builtin/notes.c b/builtin/notes.c
index 39304ba743..08ab9d7130 100644
--- a/builtin/notes.c
+++ b/builtin/notes.c
@@ -118,11 +118,11 @@ static int list_each_note(const struct object_id *object_oid,
 	return 0;
 }
 
-static void copy_obj_to_fd(int fd, const unsigned char *sha1)
+static void copy_obj_to_fd(int fd, const struct object_id *oid)
 {
 	unsigned long size;
 	enum object_type type;
-	char *buf = read_sha1_file(sha1, &type, &size);
+	char *buf = read_sha1_file(oid->hash, &type, &size);
 	if (buf) {
 		if (size)
 			write_or_die(fd, buf, size);
@@ -162,7 +162,7 @@ static void write_commented_object(int fd, const struct object_id *object)
 }
 
 static void prepare_note_data(const struct object_id *object, struct note_data *d,
-		const unsigned char *old_note)
+		const struct object_id *old_note)
 {
 	if (d->use_editor || !d->given) {
 		int fd;
@@ -457,7 +457,7 @@ static int add(int argc, const char **argv, const char *prefix)
 			oid_to_hex(&object));
 	}
 
-	prepare_note_data(&object, &d, note ? note->hash : NULL);
+	prepare_note_data(&object, &d, note);
 	if (d.buf.len || allow_empty) {
 		write_note_data(&d, &new_note);
 		if (add_note(t, &object, &new_note, combine_notes_overwrite))
@@ -602,7 +602,7 @@ static int append_edit(int argc, const char **argv, const char *prefix)
 	t = init_notes_check(argv[0], NOTES_INIT_WRITABLE);
 	note = get_note(t, &object);
 
-	prepare_note_data(&object, &d, edit && note ? note->hash : NULL);
+	prepare_note_data(&object, &d, edit && note ? note : NULL);
 
 	if (note && !edit) {
 		/* Append buf to previous note contents */

[PATCH v2 29/36] tree-walk: convert get_tree_entry_follow_symlinks internals to object_id

[brian m. carlson]

Convert the internals of this function to use struct object_id.  This is
one of the last remaining callers of read_sha1_file_extended that has
not been converted yet.

Signed-off-by: brian m. carlson <sandals@crustytoothpaste.net>
---
 tree-walk.c | 22 +++++++++++-----------
 1 file changed, 11 insertions(+), 11 deletions(-)

diff --git a/tree-walk.c b/tree-walk.c
index 63a87ed666..521defdaa2 100644
--- a/tree-walk.c
+++ b/tree-walk.c
@@ -583,14 +583,14 @@ enum follow_symlinks_result get_tree_entry_follow_symlinks(unsigned char *tree_s
 	struct dir_state *parents = NULL;
 	size_t parents_alloc = 0;
 	size_t i, parents_nr = 0;
-	unsigned char current_tree_sha1[20];
+	struct object_id current_tree_oid;
 	struct strbuf namebuf = STRBUF_INIT;
 	struct tree_desc t;
 	int follows_remaining = GET_TREE_ENTRY_FOLLOW_SYMLINKS_MAX_LINKS;
 
 	init_tree_desc(&t, NULL, 0UL);
 	strbuf_addstr(&namebuf, name);
-	hashcpy(current_tree_sha1, tree_sha1);
+	hashcpy(current_tree_oid.hash, tree_sha1);
 
 	while (1) {
 		int find_result;
@@ -599,22 +599,22 @@ enum follow_symlinks_result get_tree_entry_follow_symlinks(unsigned char *tree_s
 
 		if (!t.buffer) {
 			void *tree;
-			unsigned char root[20];
+			struct object_id root;
 			unsigned long size;
-			tree = read_object_with_reference(current_tree_sha1,
+			tree = read_object_with_reference(current_tree_oid.hash,
 							  tree_type, &size,
-							  root);
+							  root.hash);
 			if (!tree)
 				goto done;
 
 			ALLOC_GROW(parents, parents_nr + 1, parents_alloc);
 			parents[parents_nr].tree = tree;
 			parents[parents_nr].size = size;
-			hashcpy(parents[parents_nr].sha1, root);
+			hashcpy(parents[parents_nr].sha1, root.hash);
 			parents_nr++;
 
 			if (namebuf.buf[0] == '\0') {
-				hashcpy(result, root);
+				hashcpy(result, root.hash);
 				retval = FOUND;
 				goto done;
 			}
@@ -671,14 +671,14 @@ enum follow_symlinks_result get_tree_entry_follow_symlinks(unsigned char *tree_s
 
 		/* Look up the first (or only) path component in the tree. */
 		find_result = find_tree_entry(&t, namebuf.buf,
-					      current_tree_sha1, mode);
+					      current_tree_oid.hash, mode);
 		if (find_result) {
 			goto done;
 		}
 
 		if (S_ISDIR(*mode)) {
 			if (!remainder) {
-				hashcpy(result, current_tree_sha1);
+				hashcpy(result, current_tree_oid.hash);
 				retval = FOUND;
 				goto done;
 			}
@@ -688,7 +688,7 @@ enum follow_symlinks_result get_tree_entry_follow_symlinks(unsigned char *tree_s
 				      1 + first_slash - namebuf.buf);
 		} else if (S_ISREG(*mode)) {
 			if (!remainder) {
-				hashcpy(result, current_tree_sha1);
+				hashcpy(result, current_tree_oid.hash);
 				retval = FOUND;
 			} else {
 				retval = NOT_DIR;
@@ -714,7 +714,7 @@ enum follow_symlinks_result get_tree_entry_follow_symlinks(unsigned char *tree_s
 			 */
 			retval = DANGLING_SYMLINK;
 
-			contents = read_sha1_file(current_tree_sha1, &type,
+			contents = read_sha1_file(current_tree_oid.hash, &type,
 						  &link_len);
 
 			if (!contents)

[PATCH v2 30/36] streaming: convert istream internals to struct object_id

[brian m. carlson]

Convert the various open_istream variants to take a pointer to struct
object_id.  Introduce a temporary, which will be removed later, to work
around the fact that lookup_replace_object still returns a pointer to
unsigned char.

Signed-off-by: brian m. carlson <sandals@crustytoothpaste.net>
---
 streaming.c | 15 +++++++++------
 1 file changed, 9 insertions(+), 6 deletions(-)

diff --git a/streaming.c b/streaming.c
index 344678e95f..3f4be1ea2c 100644
--- a/streaming.c
+++ b/streaming.c
@@ -14,7 +14,7 @@ enum input_source {
 
 typedef int (*open_istream_fn)(struct git_istream *,
 			       struct object_info *,
-			       const unsigned char *,
+			       const struct object_id *,
 			       enum object_type *);
 typedef int (*close_istream_fn)(struct git_istream *);
 typedef ssize_t (*read_istream_fn)(struct git_istream *, char *, size_t);
@@ -27,7 +27,7 @@ struct stream_vtbl {
 #define open_method_decl(name) \
 	int open_istream_ ##name \
 	(struct git_istream *st, struct object_info *oi, \
-	 const unsigned char *sha1, \
+	 const struct object_id *oid, \
 	 enum object_type *type)
 
 #define close_method_decl(name) \
@@ -142,13 +142,16 @@ struct git_istream *open_istream(const struct object_id *oid,
 	struct object_info oi = OBJECT_INFO_INIT;
 	const unsigned char *real = lookup_replace_object(oid->hash);
 	enum input_source src = istream_source(real, type, &oi);
+	struct object_id realoid;
+
+	hashcpy(realoid.hash, real);
 
 	if (src < 0)
 		return NULL;
 
 	st = xmalloc(sizeof(*st));
-	if (open_istream_tbl[src](st, &oi, real, type)) {
-		if (open_istream_incore(st, &oi, real, type)) {
+	if (open_istream_tbl[src](st, &oi, &realoid, type)) {
+		if (open_istream_incore(st, &oi, &realoid, type)) {
 			free(st);
 			return NULL;
 		}
@@ -338,7 +341,7 @@ static struct stream_vtbl loose_vtbl = {
 
 static open_method_decl(loose)
 {
-	st->u.loose.mapped = map_sha1_file(sha1, &st->u.loose.mapsize);
+	st->u.loose.mapped = map_sha1_file(oid->hash, &st->u.loose.mapsize);
 	if (!st->u.loose.mapped)
 		return -1;
 	if ((unpack_sha1_header(&st->z,
@@ -489,7 +492,7 @@ static struct stream_vtbl incore_vtbl = {
 
 static open_method_decl(incore)
 {
-	st->u.incore.buf = read_sha1_file_extended(sha1, type, &st->size, 0);
+	st->u.incore.buf = read_sha1_file_extended(oid->hash, type, &st->size, 0);
 	st->u.incore.read_ptr = 0;
 	st->vtbl = &incore_vtbl;
 

[PATCH v2 31/36] tree-walk: convert tree entry functions to object_id

[brian m. carlson]

Convert get_tree_entry and find_tree_entry to take pointers to struct
object_id.

Signed-off-by: brian m. carlson <sandals@crustytoothpaste.net>
---
 archive.c              |  4 ++--
 blame.c                |  6 ++----
 builtin/rm.c           |  2 +-
 builtin/update-index.c |  2 +-
 line-log.c             |  3 +--
 match-trees.c          |  6 +++---
 merge-recursive.c      | 12 ++++++------
 notes.c                |  2 +-
 sha1_name.c            |  7 +++----
 tree-walk.c            | 20 ++++++++++----------
 tree-walk.h            |  2 +-
 11 files changed, 31 insertions(+), 35 deletions(-)

diff --git a/archive.c b/archive.c
index da62b2f541..1ab62d426e 100644
--- a/archive.c
+++ b/archive.c
@@ -397,8 +397,8 @@ static void parse_treeish_arg(const char **argv,
 		unsigned int mode;
 		int err;
 
-		err = get_tree_entry(tree->object.oid.hash, prefix,
-				     tree_oid.hash, &mode);
+		err = get_tree_entry(&tree->object.oid, prefix, &tree_oid,
+				     &mode);
 		if (err || !S_ISDIR(mode))
 			die("current working directory is untracked");
 
diff --git a/blame.c b/blame.c
index c1df10cdd2..3f9bd29615 100644
--- a/blame.c
+++ b/blame.c
@@ -80,7 +80,7 @@ static void verify_working_tree_path(struct commit *work_tree, const char *path)
 		struct object_id blob_oid;
 		unsigned mode;
 
-		if (!get_tree_entry(commit_oid->hash, path, blob_oid.hash, &mode) &&
+		if (!get_tree_entry(commit_oid, path, &blob_oid, &mode) &&
 		    oid_object_info(&blob_oid, NULL) == OBJ_BLOB)
 			return;
 	}
@@ -502,9 +502,7 @@ static int fill_blob_sha1_and_mode(struct blame_origin *origin)
 {
 	if (!is_null_oid(&origin->blob_oid))
 		return 0;
-	if (get_tree_entry(origin->commit->object.oid.hash,
-			   origin->path,
-			   origin->blob_oid.hash, &origin->mode))
+	if (get_tree_entry(&origin->commit->object.oid, origin->path, &origin->blob_oid, &origin->mode))
 		goto error_out;
 	if (oid_object_info(&origin->blob_oid, NULL) != OBJ_BLOB)
 		goto error_out;
diff --git a/builtin/rm.c b/builtin/rm.c
index 4a2fcca27b..974a7ef5bf 100644
--- a/builtin/rm.c
+++ b/builtin/rm.c
@@ -178,7 +178,7 @@ static int check_local_mod(struct object_id *head, int index_only)
 		 * way as changed from the HEAD.
 		 */
 		if (no_head
-		     || get_tree_entry(head->hash, name, oid.hash, &mode)
+		     || get_tree_entry(head, name, &oid, &mode)
 		     || ce->ce_mode != create_ce_mode(mode)
 		     || oidcmp(&ce->oid, &oid))
 			staged_changes = 1;
diff --git a/builtin/update-index.c b/builtin/update-index.c
index 58d1c2d282..9625d1e10a 100644
--- a/builtin/update-index.c
+++ b/builtin/update-index.c
@@ -592,7 +592,7 @@ static struct cache_entry *read_one_ent(const char *which,
 	int size;
 	struct cache_entry *ce;
 
-	if (get_tree_entry(ent->hash, path, oid.hash, &mode)) {
+	if (get_tree_entry(ent, path, &oid, &mode)) {
 		if (which)
 			error("%s: not in %s branch.", path, which);
 		return NULL;
diff --git a/line-log.c b/line-log.c
index 545ad0f28b..700121eb92 100644
--- a/line-log.c
+++ b/line-log.c
@@ -501,8 +501,7 @@ static void fill_blob_sha1(struct commit *commit, struct diff_filespec *spec)
 	unsigned mode;
 	struct object_id oid;
 
-	if (get_tree_entry(commit->object.oid.hash, spec->path,
-			   oid.hash, &mode))
+	if (get_tree_entry(&commit->object.oid, spec->path, &oid, &mode))
 		die("There is no path %s in the commit", spec->path);
 	fill_filespec(spec, &oid, 1, mode);
 
diff --git a/match-trees.c b/match-trees.c
index 0ca99d5162..10d6c39d47 100644
--- a/match-trees.c
+++ b/match-trees.c
@@ -269,7 +269,7 @@ void shift_tree(const struct object_id *hash1,
 		if (!*del_prefix)
 			return;
 
-		if (get_tree_entry(hash2->hash, del_prefix, shifted->hash, &mode))
+		if (get_tree_entry(hash2, del_prefix, shifted, &mode))
 			die("cannot find path %s in tree %s",
 			    del_prefix, oid_to_hex(hash2));
 		return;
@@ -296,12 +296,12 @@ void shift_tree_by(const struct object_id *hash1,
 	unsigned candidate = 0;
 
 	/* Can hash2 be a tree at shift_prefix in tree hash1? */
-	if (!get_tree_entry(hash1->hash, shift_prefix, sub1.hash, &mode1) &&
+	if (!get_tree_entry(hash1, shift_prefix, &sub1, &mode1) &&
 	    S_ISDIR(mode1))
 		candidate |= 1;
 
 	/* Can hash1 be a tree at shift_prefix in tree hash2? */
-	if (!get_tree_entry(hash2->hash, shift_prefix, sub2.hash, &mode2) &&
+	if (!get_tree_entry(hash2, shift_prefix, &sub2, &mode2) &&
 	    S_ISDIR(mode2))
 		candidate |= 2;
 
diff --git a/merge-recursive.c b/merge-recursive.c
index f58f13957e..85f8cbee99 100644
--- a/merge-recursive.c
+++ b/merge-recursive.c
@@ -370,12 +370,12 @@ static struct stage_data *insert_stage_data(const char *path,
 {
 	struct string_list_item *item;
 	struct stage_data *e = xcalloc(1, sizeof(struct stage_data));
-	get_tree_entry(o->object.oid.hash, path,
-			e->stages[1].oid.hash, &e->stages[1].mode);
-	get_tree_entry(a->object.oid.hash, path,
-			e->stages[2].oid.hash, &e->stages[2].mode);
-	get_tree_entry(b->object.oid.hash, path,
-			e->stages[3].oid.hash, &e->stages[3].mode);
+	get_tree_entry(&o->object.oid, path,
+			&e->stages[1].oid, &e->stages[1].mode);
+	get_tree_entry(&a->object.oid, path,
+			&e->stages[2].oid, &e->stages[2].mode);
+	get_tree_entry(&b->object.oid, path,
+			&e->stages[3].oid, &e->stages[3].mode);
 	item = string_list_insert(entries, path);
 	item->util = e;
 	return e;
diff --git a/notes.c b/notes.c
index ce9a8f53f8..d25121a65d 100644
--- a/notes.c
+++ b/notes.c
@@ -1012,7 +1012,7 @@ void init_notes(struct notes_tree *t, const char *notes_ref,
 		return;
 	if (flags & NOTES_INIT_WRITABLE && read_ref(notes_ref, &object_oid))
 		die("Cannot use notes ref %s", notes_ref);
-	if (get_tree_entry(object_oid.hash, "", oid.hash, &mode))
+	if (get_tree_entry(&object_oid, "", &oid, &mode))
 		die("Failed to read notes tree referenced by %s (%s)",
 		    notes_ref, oid_to_hex(&object_oid));
 
diff --git a/sha1_name.c b/sha1_name.c
index 6d4c6033c8..8b0012c253 100644
--- a/sha1_name.c
+++ b/sha1_name.c
@@ -1529,8 +1529,7 @@ static void diagnose_invalid_oid_path(const char *prefix,
 	if (is_missing_file_error(errno)) {
 		char *fullname = xstrfmt("%s%s", prefix, filename);
 
-		if (!get_tree_entry(tree_oid->hash, fullname,
-				    oid.hash, &mode)) {
+		if (!get_tree_entry(tree_oid, fullname, &oid, &mode)) {
 			die("Path '%s' exists, but not '%s'.\n"
 			    "Did you mean '%.*s:%s' aka '%.*s:./%s'?",
 			    fullname,
@@ -1722,8 +1721,8 @@ static int get_oid_with_context_1(const char *name,
 					filename, oid->hash, &oc->symlink_path,
 					&oc->mode);
 			} else {
-				ret = get_tree_entry(tree_oid.hash, filename,
-						     oid->hash, &oc->mode);
+				ret = get_tree_entry(&tree_oid, filename, oid,
+						     &oc->mode);
 				if (ret && only_to_die) {
 					diagnose_invalid_oid_path(prefix,
 								   filename,
diff --git a/tree-walk.c b/tree-walk.c
index 521defdaa2..a60837c491 100644
--- a/tree-walk.c
+++ b/tree-walk.c
@@ -492,7 +492,7 @@ struct dir_state {
 	unsigned char sha1[20];
 };
 
-static int find_tree_entry(struct tree_desc *t, const char *name, unsigned char *result, unsigned *mode)
+static int find_tree_entry(struct tree_desc *t, const char *name, struct object_id *result, unsigned *mode)
 {
 	int namelen = strlen(name);
 	while (t->size) {
@@ -511,7 +511,7 @@ static int find_tree_entry(struct tree_desc *t, const char *name, unsigned char
 		if (cmp < 0)
 			break;
 		if (entrylen == namelen) {
-			hashcpy(result, oid->hash);
+			oidcpy(result, oid);
 			return 0;
 		}
 		if (name[entrylen] != '/')
@@ -519,27 +519,27 @@ static int find_tree_entry(struct tree_desc *t, const char *name, unsigned char
 		if (!S_ISDIR(*mode))
 			break;
 		if (++entrylen == namelen) {
-			hashcpy(result, oid->hash);
+			oidcpy(result, oid);
 			return 0;
 		}
-		return get_tree_entry(oid->hash, name + entrylen, result, mode);
+		return get_tree_entry(oid, name + entrylen, result, mode);
 	}
 	return -1;
 }
 
-int get_tree_entry(const unsigned char *tree_sha1, const char *name, unsigned char *sha1, unsigned *mode)
+int get_tree_entry(const struct object_id *tree_oid, const char *name, struct object_id *oid, unsigned *mode)
 {
 	int retval;
 	void *tree;
 	unsigned long size;
-	unsigned char root[20];
+	struct object_id root;
 
-	tree = read_object_with_reference(tree_sha1, tree_type, &size, root);
+	tree = read_object_with_reference(tree_oid->hash, tree_type, &size, root.hash);
 	if (!tree)
 		return -1;
 
 	if (name[0] == '\0') {
-		hashcpy(sha1, root);
+		oidcpy(oid, &root);
 		free(tree);
 		return 0;
 	}
@@ -549,7 +549,7 @@ int get_tree_entry(const unsigned char *tree_sha1, const char *name, unsigned ch
 	} else {
 		struct tree_desc t;
 		init_tree_desc(&t, tree, size);
-		retval = find_tree_entry(&t, name, sha1, mode);
+		retval = find_tree_entry(&t, name, oid, mode);
 	}
 	free(tree);
 	return retval;
@@ -671,7 +671,7 @@ enum follow_symlinks_result get_tree_entry_follow_symlinks(unsigned char *tree_s
 
 		/* Look up the first (or only) path component in the tree. */
 		find_result = find_tree_entry(&t, namebuf.buf,
-					      current_tree_oid.hash, mode);
+					      &current_tree_oid, mode);
 		if (find_result) {
 			goto done;
 		}
diff --git a/tree-walk.h b/tree-walk.h
index b6bd1b4ccf..4617deeb0e 100644
--- a/tree-walk.h
+++ b/tree-walk.h
@@ -79,7 +79,7 @@ struct traverse_info {
 	int show_all_errors;
 };
 
-int get_tree_entry(const unsigned char *, const char *, unsigned char *, unsigned *);
+int get_tree_entry(const struct object_id *, const char *, struct object_id *, unsigned *);
 extern char *make_traverse_path(char *path, const struct traverse_info *info, const struct name_entry *n);
 extern void setup_traverse_info(struct traverse_info *info, const char *base);
 

[PATCH v2 32/36] sha1_file: convert read_object_with_reference to object_id

[brian m. carlson]

Convert read_object_with_reference to take pointers to struct object_id.
Update the internals of the function accordingly.

Signed-off-by: brian m. carlson <sandals@crustytoothpaste.net>
---
 builtin/cat-file.c     |  2 +-
 builtin/grep.c         |  4 ++--
 builtin/pack-objects.c |  2 +-
 cache.h                |  4 ++--
 fast-import.c          | 15 ++++++++-------
 sha1_file.c            | 20 ++++++++++----------
 tree-walk.c            |  9 ++++-----
 7 files changed, 28 insertions(+), 28 deletions(-)

diff --git a/builtin/cat-file.c b/builtin/cat-file.c
index 3264bada39..17382f2fa4 100644
--- a/builtin/cat-file.c
+++ b/builtin/cat-file.c
@@ -159,7 +159,7 @@ static int cat_one_file(int opt, const char *exp_type, const char *obj_name,
 			 * fall-back to the usual case.
 			 */
 		}
-		buf = read_object_with_reference(oid.hash, exp_type, &size, NULL);
+		buf = read_object_with_reference(&oid, exp_type, &size, NULL);
 		break;
 
 	default:
diff --git a/builtin/grep.c b/builtin/grep.c
index 3ca4ac80d8..7c2843a492 100644
--- a/builtin/grep.c
+++ b/builtin/grep.c
@@ -445,7 +445,7 @@ static int grep_submodule(struct grep_opt *opt, struct repository *superproject,
 		object = parse_object_or_die(oid, oid_to_hex(oid));
 
 		grep_read_lock();
-		data = read_object_with_reference(object->oid.hash, tree_type,
+		data = read_object_with_reference(&object->oid, tree_type,
 						  &size, NULL);
 		grep_read_unlock();
 
@@ -607,7 +607,7 @@ static int grep_object(struct grep_opt *opt, const struct pathspec *pathspec,
 		int hit, len;
 
 		grep_read_lock();
-		data = read_object_with_reference(obj->oid.hash, tree_type,
+		data = read_object_with_reference(&obj->oid, tree_type,
 						  &size, NULL);
 		grep_read_unlock();
 
diff --git a/builtin/pack-objects.c b/builtin/pack-objects.c
index f8148eb9d5..16d6069e16 100644
--- a/builtin/pack-objects.c
+++ b/builtin/pack-objects.c
@@ -1351,7 +1351,7 @@ static void add_preferred_base(struct object_id *oid)
 	if (window <= num_preferred_base++)
 		return;
 
-	data = read_object_with_reference(oid->hash, tree_type, &size, tree_oid.hash);
+	data = read_object_with_reference(oid, tree_type, &size, &tree_oid);
 	if (!data)
 		return;
 
diff --git a/cache.h b/cache.h
index b965a073f2..c482fb92fe 100644
--- a/cache.h
+++ b/cache.h
@@ -1431,10 +1431,10 @@ extern int df_name_compare(const char *name1, int len1, int mode1, const char *n
 extern int name_compare(const char *name1, size_t len1, const char *name2, size_t len2);
 extern int cache_name_stage_compare(const char *name1, int len1, int stage1, const char *name2, int len2, int stage2);
 
-extern void *read_object_with_reference(const unsigned char *sha1,
+extern void *read_object_with_reference(const struct object_id *oid,
 					const char *required_type,
 					unsigned long *size,
-					unsigned char *sha1_ret);
+					struct object_id *oid_ret);
 
 extern struct object *peel_to_type(const char *name, int namelen,
 				   struct object *o, enum object_type);
diff --git a/fast-import.c b/fast-import.c
index 71b60f9068..004a9c9f99 100644
--- a/fast-import.c
+++ b/fast-import.c
@@ -2583,8 +2583,9 @@ static void note_change_n(const char *p, struct branch *b, unsigned char *old_fa
 		oidcpy(&commit_oid, &commit_oe->idx.oid);
 	} else if (!get_oid(p, &commit_oid)) {
 		unsigned long size;
-		char *buf = read_object_with_reference(commit_oid.hash,
-			commit_type, &size, commit_oid.hash);
+		char *buf = read_object_with_reference(&commit_oid,
+						       commit_type, &size,
+						       &commit_oid);
 		if (!buf || size < 46)
 			die("Not a valid commit: %s", p);
 		free(buf);
@@ -2653,9 +2654,8 @@ static void parse_from_existing(struct branch *b)
 		unsigned long size;
 		char *buf;
 
-		buf = read_object_with_reference(b->oid.hash,
-						 commit_type, &size,
-						 b->oid.hash);
+		buf = read_object_with_reference(&b->oid, commit_type, &size,
+						 &b->oid);
 		parse_from_commit(b, buf, size);
 		free(buf);
 	}
@@ -2732,8 +2732,9 @@ static struct hash_list *parse_merge(unsigned int *count)
 			oidcpy(&n->oid, &oe->idx.oid);
 		} else if (!get_oid(from, &n->oid)) {
 			unsigned long size;
-			char *buf = read_object_with_reference(n->oid.hash,
-				commit_type, &size, n->oid.hash);
+			char *buf = read_object_with_reference(&n->oid,
+							       commit_type,
+							       &size, &n->oid);
 			if (!buf || size < 46)
 				die("Not a valid commit: %s", from);
 			free(buf);
diff --git a/sha1_file.c b/sha1_file.c
index 1719c218e2..bf8a713185 100644
--- a/sha1_file.c
+++ b/sha1_file.c
@@ -1399,29 +1399,29 @@ void *read_sha1_file_extended(const unsigned char *sha1,
 	return NULL;
 }
 
-void *read_object_with_reference(const unsigned char *sha1,
+void *read_object_with_reference(const struct object_id *oid,
 				 const char *required_type_name,
 				 unsigned long *size,
-				 unsigned char *actual_sha1_return)
+				 struct object_id *actual_oid_return)
 {
 	enum object_type type, required_type;
 	void *buffer;
 	unsigned long isize;
-	unsigned char actual_sha1[20];
+	struct object_id actual_oid;
 
 	required_type = type_from_string(required_type_name);
-	hashcpy(actual_sha1, sha1);
+	oidcpy(&actual_oid, oid);
 	while (1) {
 		int ref_length = -1;
 		const char *ref_type = NULL;
 
-		buffer = read_sha1_file(actual_sha1, &type, &isize);
+		buffer = read_sha1_file(actual_oid.hash, &type, &isize);
 		if (!buffer)
 			return NULL;
 		if (type == required_type) {
 			*size = isize;
-			if (actual_sha1_return)
-				hashcpy(actual_sha1_return, actual_sha1);
+			if (actual_oid_return)
+				oidcpy(actual_oid_return, &actual_oid);
 			return buffer;
 		}
 		/* Handle references */
@@ -1435,15 +1435,15 @@ void *read_object_with_reference(const unsigned char *sha1,
 		}
 		ref_length = strlen(ref_type);
 
-		if (ref_length + 40 > isize ||
+		if (ref_length + GIT_SHA1_HEXSZ > isize ||
 		    memcmp(buffer, ref_type, ref_length) ||
-		    get_sha1_hex((char *) buffer + ref_length, actual_sha1)) {
+		    get_oid_hex((char *) buffer + ref_length, &actual_oid)) {
 			free(buffer);
 			return NULL;
 		}
 		free(buffer);
 		/* Now we have the ID of the referred-to object in
-		 * actual_sha1.  Check again. */
+		 * actual_oid.  Check again. */
 	}
 }
 
diff --git a/tree-walk.c b/tree-walk.c
index a60837c491..b7e504070c 100644
--- a/tree-walk.c
+++ b/tree-walk.c
@@ -84,8 +84,7 @@ void *fill_tree_descriptor(struct tree_desc *desc, const struct object_id *oid)
 	void *buf = NULL;
 
 	if (oid) {
-		buf = read_object_with_reference(oid->hash, tree_type, &size,
-						 NULL);
+		buf = read_object_with_reference(oid, tree_type, &size, NULL);
 		if (!buf)
 			die("unable to read tree %s", oid_to_hex(oid));
 	}
@@ -534,7 +533,7 @@ int get_tree_entry(const struct object_id *tree_oid, const char *name, struct ob
 	unsigned long size;
 	struct object_id root;
 
-	tree = read_object_with_reference(tree_oid->hash, tree_type, &size, root.hash);
+	tree = read_object_with_reference(tree_oid, tree_type, &size, &root);
 	if (!tree)
 		return -1;
 
@@ -601,9 +600,9 @@ enum follow_symlinks_result get_tree_entry_follow_symlinks(unsigned char *tree_s
 			void *tree;
 			struct object_id root;
 			unsigned long size;
-			tree = read_object_with_reference(current_tree_oid.hash,
+			tree = read_object_with_reference(&current_tree_oid,
 							  tree_type, &size,
-							  root.hash);
+							  &root);
 			if (!tree)
 				goto done;
 

[PATCH v2 33/36] sha1_file: convert read_sha1_file to struct object_id

[brian m. carlson]

Convert read_sha1_file to take a pointer to struct object_id and rename
it read_object_file.  Do the same for read_sha1_file_extended.

Convert one use in grep.c to use the new function without any other code
change, since the pointer being passed is a void pointer that is already
initialized with a pointer to struct object_id.  Update the declaration
and definitions of the modified functions, and apply the following
semantic patch to convert the remaining callers:

@@
expression E1, E2, E3;
@@
- read_sha1_file(E1.hash, E2, E3)
+ read_object_file(&E1, E2, E3)

@@
expression E1, E2, E3;
@@
- read_sha1_file(E1->hash, E2, E3)
+ read_object_file(E1, E2, E3)

@@
expression E1, E2, E3, E4;
@@
- read_sha1_file_extended(E1.hash, E2, E3, E4)
+ read_object_file_extended(&E1, E2, E3, E4)

@@
expression E1, E2, E3, E4;
@@
- read_sha1_file_extended(E1->hash, E2, E3, E4)
+ read_object_file_extended(E1, E2, E3, E4)

Signed-off-by: brian m. carlson <sandals@crustytoothpaste.net>
---
 apply.c                  |  4 ++--
 archive.c                |  2 +-
 bisect.c                 |  3 ++-
 blame.c                  |  8 ++++----
 builtin/cat-file.c       | 14 ++++++++------
 builtin/difftool.c       |  2 +-
 builtin/fast-export.c    |  4 ++--
 builtin/fmt-merge-msg.c  |  2 +-
 builtin/grep.c           |  2 +-
 builtin/index-pack.c     |  5 +++--
 builtin/log.c            |  2 +-
 builtin/merge-tree.c     |  5 +++--
 builtin/mktag.c          |  2 +-
 builtin/notes.c          |  6 +++---
 builtin/pack-objects.c   | 16 ++++++----------
 builtin/reflog.c         |  2 +-
 builtin/tag.c            |  4 ++--
 builtin/unpack-file.c    |  2 +-
 builtin/unpack-objects.c |  2 +-
 builtin/verify-commit.c  |  2 +-
 bundle.c                 |  2 +-
 cache.h                  | 10 +++++-----
 combine-diff.c           |  2 +-
 commit.c                 |  6 +++---
 config.c                 |  2 +-
 diff.c                   |  2 +-
 dir.c                    |  2 +-
 entry.c                  |  2 +-
 fast-import.c            |  6 +++---
 fsck.c                   |  2 +-
 grep.c                   |  2 +-
 http-push.c              |  2 +-
 mailmap.c                |  2 +-
 match-trees.c            |  4 ++--
 merge-blobs.c            |  4 ++--
 merge-recursive.c        |  4 ++--
 notes-cache.c            |  2 +-
 notes-merge.c            |  2 +-
 notes.c                  |  8 ++++----
 object.c                 |  2 +-
 read-cache.c             |  4 ++--
 ref-filter.c             |  2 +-
 remote-testsvn.c         |  4 ++--
 rerere.c                 |  4 ++--
 sha1_file.c              | 20 ++++++++++----------
 streaming.c              |  2 +-
 submodule-config.c       |  2 +-
 tag.c                    |  4 ++--
 tree-walk.c              |  4 ++--
 tree.c                   |  2 +-
 xdiff-interface.c        |  2 +-
 51 files changed, 104 insertions(+), 103 deletions(-)

diff --git a/apply.c b/apply.c
index 40a368b315..dd3cf99b7c 100644
--- a/apply.c
+++ b/apply.c
@@ -3180,7 +3180,7 @@ static int apply_binary(struct apply_state *state,
 		unsigned long size;
 		char *result;
 
-		result = read_sha1_file(oid.hash, &type, &size);
+		result = read_object_file(&oid, &type, &size);
 		if (!result)
 			return error(_("the necessary postimage %s for "
 				       "'%s' cannot be read"),
@@ -3242,7 +3242,7 @@ static int read_blob_object(struct strbuf *buf, const struct object_id *oid, uns
 		unsigned long sz;
 		char *result;
 
-		result = read_sha1_file(oid->hash, &type, &sz);
+		result = read_object_file(oid, &type, &sz);
 		if (!result)
 			return -1;
 		/* XXX read_sha1_file NUL-terminates */
diff --git a/archive.c b/archive.c
index 1ab62d426e..93ab175b0b 100644
--- a/archive.c
+++ b/archive.c
@@ -72,7 +72,7 @@ void *object_file_to_archive(const struct archiver_args *args,
 	const struct commit *commit = args->convert ? args->commit : NULL;
 
 	path += args->baselen;
-	buffer = read_sha1_file(oid->hash, type, sizep);
+	buffer = read_object_file(oid, type, sizep);
 	if (buffer && S_ISREG(mode)) {
 		struct strbuf buf = STRBUF_INIT;
 		size_t size = 0;
diff --git a/bisect.c b/bisect.c
index f6d05bd66f..ad395bb2b8 100644
--- a/bisect.c
+++ b/bisect.c
@@ -132,7 +132,8 @@ static void show_list(const char *debug, int counted, int nr,
 		unsigned flags = commit->object.flags;
 		enum object_type type;
 		unsigned long size;
-		char *buf = read_sha1_file(commit->object.oid.hash, &type, &size);
+		char *buf = read_object_file(&commit->object.oid, &type,
+					     &size);
 		const char *subject_start;
 		int subject_len;
 
diff --git a/blame.c b/blame.c
index 3f9bd29615..e5ed80083e 100644
--- a/blame.c
+++ b/blame.c
@@ -297,8 +297,8 @@ static void fill_origin_blob(struct diff_options *opt,
 		    textconv_object(o->path, o->mode, &o->blob_oid, 1, &file->ptr, &file_size))
 			;
 		else
-			file->ptr = read_sha1_file(o->blob_oid.hash, &type,
-						   &file_size);
+			file->ptr = read_object_file(&o->blob_oid, &type,
+						     &file_size);
 		file->size = file_size;
 
 		if (!file->ptr)
@@ -1828,8 +1828,8 @@ void setup_scoreboard(struct blame_scoreboard *sb, const char *path, struct blam
 				    &sb->final_buf_size))
 			;
 		else
-			sb->final_buf = read_sha1_file(o->blob_oid.hash, &type,
-						       &sb->final_buf_size);
+			sb->final_buf = read_object_file(&o->blob_oid, &type,
+							 &sb->final_buf_size);
 
 		if (!sb->final_buf)
 			die(_("cannot read blob %s for path %s"),
diff --git a/builtin/cat-file.c b/builtin/cat-file.c
index 17382f2fa4..044b82bcee 100644
--- a/builtin/cat-file.c
+++ b/builtin/cat-file.c
@@ -32,7 +32,7 @@ static int filter_object(const char *path, unsigned mode,
 {
 	enum object_type type;
 
-	*buf = read_sha1_file(oid->hash, &type, size);
+	*buf = read_object_file(oid, &type, size);
 	if (!*buf)
 		return error(_("cannot read object %s '%s'"),
 			     oid_to_hex(oid), path);
@@ -130,7 +130,7 @@ static int cat_one_file(int opt, const char *exp_type, const char *obj_name,
 
 		if (type == OBJ_BLOB)
 			return stream_blob_to_fd(1, &oid, NULL, 0);
-		buf = read_sha1_file(oid.hash, &type, &size);
+		buf = read_object_file(&oid, &type, &size);
 		if (!buf)
 			die("Cannot read object %s", obj_name);
 
@@ -141,7 +141,8 @@ static int cat_one_file(int opt, const char *exp_type, const char *obj_name,
 		if (type_from_string(exp_type) == OBJ_BLOB) {
 			struct object_id blob_oid;
 			if (oid_object_info(&oid, NULL) == OBJ_TAG) {
-				char *buffer = read_sha1_file(oid.hash, &type, &size);
+				char *buffer = read_object_file(&oid, &type,
+								&size);
 				const char *target;
 				if (!skip_prefix(buffer, "object ", &target) ||
 				    get_oid_hex(target, &blob_oid))
@@ -304,8 +305,9 @@ static void print_object_or_die(struct batch_options *opt, struct expand_data *d
 				enum object_type type;
 				if (!textconv_object(data->rest, 0100644, oid,
 						     1, &contents, &size))
-					contents = read_sha1_file(oid->hash, &type,
-								  &size);
+					contents = read_object_file(oid,
+								    &type,
+								    &size);
 				if (!contents)
 					die("could not convert '%s' %s",
 					    oid_to_hex(oid), data->rest);
@@ -321,7 +323,7 @@ static void print_object_or_die(struct batch_options *opt, struct expand_data *d
 		unsigned long size;
 		void *contents;
 
-		contents = read_sha1_file(oid->hash, &type, &size);
+		contents = read_object_file(oid, &type, &size);
 		if (!contents)
 			die("object %s disappeared", oid_to_hex(oid));
 		if (type != data->type)
diff --git a/builtin/difftool.c b/builtin/difftool.c
index bcc79d1888..ee8dce019e 100644
--- a/builtin/difftool.c
+++ b/builtin/difftool.c
@@ -306,7 +306,7 @@ static char *get_symlink(const struct object_id *oid, const char *path)
 	} else {
 		enum object_type type;
 		unsigned long size;
-		data = read_sha1_file(oid->hash, &type, &size);
+		data = read_object_file(oid, &type, &size);
 		if (!data)
 			die(_("could not read object %s for symlink %s"),
 				oid_to_hex(oid), path);
diff --git a/builtin/fast-export.c b/builtin/fast-export.c
index 02ec19060d..aedae7a14d 100644
--- a/builtin/fast-export.c
+++ b/builtin/fast-export.c
@@ -237,7 +237,7 @@ static void export_blob(const struct object_id *oid)
 		object = (struct object *)lookup_blob(oid);
 		eaten = 0;
 	} else {
-		buf = read_sha1_file(oid->hash, &type, &size);
+		buf = read_object_file(oid, &type, &size);
 		if (!buf)
 			die ("Could not read blob %s", oid_to_hex(oid));
 		if (check_object_signature(oid, buf, size, typename(type)) < 0)
@@ -682,7 +682,7 @@ static void handle_tag(const char *name, struct tag *tag)
 		return;
 	}
 
-	buf = read_sha1_file(tag->object.oid.hash, &type, &size);
+	buf = read_object_file(&tag->object.oid, &type, &size);
 	if (!buf)
 		die ("Could not read tag %s", oid_to_hex(&tag->object.oid));
 	message = memmem(buf, size, "\n\n", 2);
diff --git a/builtin/fmt-merge-msg.c b/builtin/fmt-merge-msg.c
index 0bc0dda99c..bd680be687 100644
--- a/builtin/fmt-merge-msg.c
+++ b/builtin/fmt-merge-msg.c
@@ -488,7 +488,7 @@ static void fmt_merge_msg_sigs(struct strbuf *out)
 		struct object_id *oid = origins.items[i].util;
 		enum object_type type;
 		unsigned long size, len;
-		char *buf = read_sha1_file(oid->hash, &type, &size);
+		char *buf = read_object_file(oid, &type, &size);
 		struct strbuf sig = STRBUF_INIT;
 
 		if (!buf || type != OBJ_TAG)
diff --git a/builtin/grep.c b/builtin/grep.c
index 7c2843a492..a0592ed065 100644
--- a/builtin/grep.c
+++ b/builtin/grep.c
@@ -307,7 +307,7 @@ static void *lock_and_read_oid_file(const struct object_id *oid, enum object_typ
 	void *data;
 
 	grep_read_lock();
-	data = read_sha1_file(oid->hash, type, size);
+	data = read_object_file(oid, type, size);
 	grep_read_unlock();
 	return data;
 }
diff --git a/builtin/index-pack.c b/builtin/index-pack.c
index 27aa50396b..5b6ef98f48 100644
--- a/builtin/index-pack.c
+++ b/builtin/index-pack.c
@@ -815,7 +815,7 @@ static void sha1_object(const void *data, struct object_entry *obj_entry,
 			die(_("cannot read existing object info %s"), oid_to_hex(oid));
 		if (has_type != type || has_size != size)
 			die(_("SHA1 COLLISION FOUND WITH %s !"), oid_to_hex(oid));
-		has_data = read_sha1_file(oid->hash, &has_type, &has_size);
+		has_data = read_object_file(oid, &has_type, &has_size);
 		read_unlock();
 		if (!data)
 			data = new_data = get_data_from_pack(obj_entry);
@@ -1373,7 +1373,8 @@ static void fix_unresolved_deltas(struct hashfile *f)
 
 		if (objects[d->obj_no].real_type != OBJ_REF_DELTA)
 			continue;
-		base_obj->data = read_sha1_file(d->oid.hash, &type, &base_obj->size);
+		base_obj->data = read_object_file(&d->oid, &type,
+						  &base_obj->size);
 		if (!base_obj->data)
 			continue;
 
diff --git a/builtin/log.c b/builtin/log.c
index 411339c1ed..71f68a3e4f 100644
--- a/builtin/log.c
+++ b/builtin/log.c
@@ -518,7 +518,7 @@ static int show_tag_object(const struct object_id *oid, struct rev_info *rev)
 {
 	unsigned long size;
 	enum object_type type;
-	char *buf = read_sha1_file(oid->hash, &type, &size);
+	char *buf = read_object_file(oid, &type, &size);
 	int offset = 0;
 
 	if (!buf)
diff --git a/builtin/merge-tree.c b/builtin/merge-tree.c
index d01ddecf66..32736e0b10 100644
--- a/builtin/merge-tree.c
+++ b/builtin/merge-tree.c
@@ -60,7 +60,7 @@ static void *result(struct merge_list *entry, unsigned long *size)
 	const char *path = entry->path;
 
 	if (!entry->stage)
-		return read_sha1_file(entry->blob->object.oid.hash, &type, size);
+		return read_object_file(&entry->blob->object.oid, &type, size);
 	base = NULL;
 	if (entry->stage == 1) {
 		base = entry->blob;
@@ -82,7 +82,8 @@ static void *origin(struct merge_list *entry, unsigned long *size)
 	enum object_type type;
 	while (entry) {
 		if (entry->stage == 2)
-			return read_sha1_file(entry->blob->object.oid.hash, &type, size);
+			return read_object_file(&entry->blob->object.oid,
+						&type, size);
 		entry = entry->link;
 	}
 	return NULL;
diff --git a/builtin/mktag.c b/builtin/mktag.c
index 810b24bef3..cfb777b3c8 100644
--- a/builtin/mktag.c
+++ b/builtin/mktag.c
@@ -23,7 +23,7 @@ static int verify_object(const struct object_id *oid, const char *expected_type)
 	int ret = -1;
 	enum object_type type;
 	unsigned long size;
-	void *buffer = read_sha1_file(oid->hash, &type, &size);
+	void *buffer = read_object_file(oid, &type, &size);
 	const unsigned char *repl = lookup_replace_object(oid->hash);
 
 	if (buffer) {
diff --git a/builtin/notes.c b/builtin/notes.c
index 08ab9d7130..5ddfa44cde 100644
--- a/builtin/notes.c
+++ b/builtin/notes.c
@@ -122,7 +122,7 @@ static void copy_obj_to_fd(int fd, const struct object_id *oid)
 {
 	unsigned long size;
 	enum object_type type;
-	char *buf = read_sha1_file(oid->hash, &type, &size);
+	char *buf = read_object_file(oid, &type, &size);
 	if (buf) {
 		if (size)
 			write_or_die(fd, buf, size);
@@ -253,7 +253,7 @@ static int parse_reuse_arg(const struct option *opt, const char *arg, int unset)
 
 	if (get_oid(arg, &object))
 		die(_("failed to resolve '%s' as a valid ref."), arg);
-	if (!(buf = read_sha1_file(object.hash, &type, &len))) {
+	if (!(buf = read_object_file(&object, &type, &len))) {
 		free(buf);
 		die(_("failed to read object '%s'."), arg);
 	}
@@ -608,7 +608,7 @@ static int append_edit(int argc, const char **argv, const char *prefix)
 		/* Append buf to previous note contents */
 		unsigned long size;
 		enum object_type type;
-		char *prev_buf = read_sha1_file(note->hash, &type, &size);
+		char *prev_buf = read_object_file(note, &type, &size);
 
 		strbuf_grow(&d.buf, size + 1);
 		if (d.buf.len && prev_buf && size)
diff --git a/builtin/pack-objects.c b/builtin/pack-objects.c
index 16d6069e16..91c7b62ec3 100644
--- a/builtin/pack-objects.c
+++ b/builtin/pack-objects.c
@@ -122,11 +122,10 @@ static void *get_delta(struct object_entry *entry)
 	void *buf, *base_buf, *delta_buf;
 	enum object_type type;
 
-	buf = read_sha1_file(entry->idx.oid.hash, &type, &size);
+	buf = read_object_file(&entry->idx.oid, &type, &size);
 	if (!buf)
 		die("unable to read %s", oid_to_hex(&entry->idx.oid));
-	base_buf = read_sha1_file(entry->delta->idx.oid.hash, &type,
-				  &base_size);
+	base_buf = read_object_file(&entry->delta->idx.oid, &type, &base_size);
 	if (!base_buf)
 		die("unable to read %s",
 		    oid_to_hex(&entry->delta->idx.oid));
@@ -270,8 +269,7 @@ static unsigned long write_no_reuse_object(struct hashfile *f, struct object_ent
 		    (st = open_istream(&entry->idx.oid, &type, &size, NULL)) != NULL)
 			buf = NULL;
 		else {
-			buf = read_sha1_file(entry->idx.oid.hash, &type,
-					     &size);
+			buf = read_object_file(&entry->idx.oid, &type, &size);
 			if (!buf)
 				die(_("unable to read %s"),
 				    oid_to_hex(&entry->idx.oid));
@@ -1190,7 +1188,7 @@ static struct pbase_tree_cache *pbase_tree_get(const struct object_id *oid)
 	/* Did not find one.  Either we got a bogus request or
 	 * we need to read and perhaps cache.
 	 */
-	data = read_sha1_file(oid->hash, &type, &size);
+	data = read_object_file(oid, &type, &size);
 	if (!data)
 		return NULL;
 	if (type != OBJ_TREE) {
@@ -1870,8 +1868,7 @@ static int try_delta(struct unpacked *trg, struct unpacked *src,
 	/* Load data if not already done */
 	if (!trg->data) {
 		read_lock();
-		trg->data = read_sha1_file(trg_entry->idx.oid.hash, &type,
-					   &sz);
+		trg->data = read_object_file(&trg_entry->idx.oid, &type, &sz);
 		read_unlock();
 		if (!trg->data)
 			die("object %s cannot be read",
@@ -1884,8 +1881,7 @@ static int try_delta(struct unpacked *trg, struct unpacked *src,
 	}
 	if (!src->data) {
 		read_lock();
-		src->data = read_sha1_file(src_entry->idx.oid.hash, &type,
-					   &sz);
+		src->data = read_object_file(&src_entry->idx.oid, &type, &sz);
 		read_unlock();
 		if (!src->data) {
 			if (src_entry->preferred_base) {
diff --git a/builtin/reflog.c b/builtin/reflog.c
index 2233725315..e8e32db92e 100644
--- a/builtin/reflog.c
+++ b/builtin/reflog.c
@@ -74,7 +74,7 @@ static int tree_is_complete(const struct object_id *oid)
 	if (!tree->buffer) {
 		enum object_type type;
 		unsigned long size;
-		void *data = read_sha1_file(oid->hash, &type, &size);
+		void *data = read_object_file(oid, &type, &size);
 		if (!data) {
 			tree->object.flags |= INCOMPLETE;
 			return 0;
diff --git a/builtin/tag.c b/builtin/tag.c
index 3340cbedd4..85d326fbe0 100644
--- a/builtin/tag.c
+++ b/builtin/tag.c
@@ -168,7 +168,7 @@ static void write_tag_body(int fd, const struct object_id *oid)
 	enum object_type type;
 	char *buf, *sp;
 
-	buf = read_sha1_file(oid->hash, &type, &size);
+	buf = read_object_file(oid, &type, &size);
 	if (!buf)
 		return;
 	/* skip header */
@@ -300,7 +300,7 @@ static void create_reflog_msg(const struct object_id *oid, struct strbuf *sb)
 		strbuf_addstr(sb, "object of unknown type");
 		break;
 	case OBJ_COMMIT:
-		if ((buf = read_sha1_file(oid->hash, &type, &size)) != NULL) {
+		if ((buf = read_object_file(oid, &type, &size)) != NULL) {
 			subject_len = find_commit_subject(buf, &subject_start);
 			strbuf_insert(sb, sb->len, subject_start, subject_len);
 		} else {
diff --git a/builtin/unpack-file.c b/builtin/unpack-file.c
index 32e0155577..300eb59657 100644
--- a/builtin/unpack-file.c
+++ b/builtin/unpack-file.c
@@ -9,7 +9,7 @@ static char *create_temp_file(struct object_id *oid)
 	unsigned long size;
 	int fd;
 
-	buf = read_sha1_file(oid->hash, &type, &size);
+	buf = read_object_file(oid, &type, &size);
 	if (!buf || type != OBJ_BLOB)
 		die("unable to read blob object %s", oid_to_hex(oid));
 
diff --git a/builtin/unpack-objects.c b/builtin/unpack-objects.c
index 6e712081e0..299608cc32 100644
--- a/builtin/unpack-objects.c
+++ b/builtin/unpack-objects.c
@@ -422,7 +422,7 @@ static void unpack_delta_entry(enum object_type type, unsigned long delta_size,
 	if (resolve_against_held(nr, &base_oid, delta_data, delta_size))
 		return;
 
-	base = read_sha1_file(base_oid.hash, &type, &base_size);
+	base = read_object_file(&base_oid, &type, &base_size);
 	if (!base) {
 		error("failed to read delta-pack base object %s",
 		      oid_to_hex(&base_oid));
diff --git a/builtin/verify-commit.c b/builtin/verify-commit.c
index ba38ac9b15..3c37ba911e 100644
--- a/builtin/verify-commit.c
+++ b/builtin/verify-commit.c
@@ -44,7 +44,7 @@ static int verify_commit(const char *name, unsigned flags)
 	if (get_oid(name, &oid))
 		return error("commit '%s' not found.", name);
 
-	buf = read_sha1_file(oid.hash, &type, &size);
+	buf = read_object_file(&oid, &type, &size);
 	if (!buf)
 		return error("%s: unable to read file.", name);
 	if (type != OBJ_COMMIT)
diff --git a/bundle.c b/bundle.c
index efe547e25f..902c9b5448 100644
--- a/bundle.c
+++ b/bundle.c
@@ -222,7 +222,7 @@ static int is_tag_in_date_range(struct object *tag, struct rev_info *revs)
 	if (revs->max_age == -1 && revs->min_age == -1)
 		goto out;
 
-	buf = read_sha1_file(tag->oid.hash, &type, &size);
+	buf = read_object_file(&tag->oid, &type, &size);
 	if (!buf)
 		goto out;
 	line = memmem(buf, size, "\ntagger ", 8);
diff --git a/cache.h b/cache.h
index c482fb92fe..970d6edd04 100644
--- a/cache.h
+++ b/cache.h
@@ -1185,12 +1185,12 @@ extern char *xdg_config_home(const char *filename);
  */
 extern char *xdg_cache_home(const char *filename);
 
-extern void *read_sha1_file_extended(const unsigned char *sha1,
-				     enum object_type *type,
-				     unsigned long *size, int lookup_replace);
-static inline void *read_sha1_file(const unsigned char *sha1, enum object_type *type, unsigned long *size)
+extern void *read_object_file_extended(const struct object_id *oid,
+				       enum object_type *type,
+				       unsigned long *size, int lookup_replace);
+static inline void *read_object_file(const struct object_id *oid, enum object_type *type, unsigned long *size)
 {
-	return read_sha1_file_extended(sha1, type, size, 1);
+	return read_object_file_extended(oid, type, size, 1);
 }
 
 /*
diff --git a/combine-diff.c b/combine-diff.c
index 3d86304c5a..e5290ac05c 100644
--- a/combine-diff.c
+++ b/combine-diff.c
@@ -306,7 +306,7 @@ static char *grab_blob(const struct object_id *oid, unsigned int mode,
 		*size = fill_textconv(textconv, df, &blob);
 		free_filespec(df);
 	} else {
-		blob = read_sha1_file(oid->hash, &type, size);
+		blob = read_object_file(oid, &type, size);
 		if (type != OBJ_BLOB)
 			die("object '%s' is not a blob!", oid_to_hex(oid));
 	}
diff --git a/commit.c b/commit.c
index b9f028976f..5e401340c4 100644
--- a/commit.c
+++ b/commit.c
@@ -266,7 +266,7 @@ const void *get_commit_buffer(const struct commit *commit, unsigned long *sizep)
 	if (!ret) {
 		enum object_type type;
 		unsigned long size;
-		ret = read_sha1_file(commit->object.oid.hash, &type, &size);
+		ret = read_object_file(&commit->object.oid, &type, &size);
 		if (!ret)
 			die("cannot read commit object %s",
 			    oid_to_hex(&commit->object.oid));
@@ -383,7 +383,7 @@ int parse_commit_gently(struct commit *item, int quiet_on_missing)
 		return -1;
 	if (item->object.parsed)
 		return 0;
-	buffer = read_sha1_file(item->object.oid.hash, &type, &size);
+	buffer = read_object_file(&item->object.oid, &type, &size);
 	if (!buffer)
 		return quiet_on_missing ? -1 :
 			error("Could not read %s",
@@ -1206,7 +1206,7 @@ static void handle_signed_tag(struct commit *parent, struct commit_extra_header
 	desc = merge_remote_util(parent);
 	if (!desc || !desc->obj)
 		return;
-	buf = read_sha1_file(desc->obj->oid.hash, &type, &size);
+	buf = read_object_file(&desc->obj->oid, &type, &size);
 	if (!buf || type != OBJ_TAG)
 		goto free_return;
 	len = parse_signature(buf, size);
diff --git a/config.c b/config.c
index b0c20e6cb8..c698988f5e 100644
--- a/config.c
+++ b/config.c
@@ -1488,7 +1488,7 @@ int git_config_from_blob_oid(config_fn_t fn,
 	unsigned long size;
 	int ret;
 
-	buf = read_sha1_file(oid->hash, &type, &size);
+	buf = read_object_file(oid, &type, &size);
 	if (!buf)
 		return error("unable to load config blob object '%s'", name);
 	if (type != OBJ_BLOB) {
diff --git a/diff.c b/diff.c
index d838ee2e9a..b117bf5105 100644
--- a/diff.c
+++ b/diff.c
@@ -3626,7 +3626,7 @@ int diff_populate_filespec(struct diff_filespec *s, unsigned int flags)
 				return 0;
 			}
 		}
-		s->data = read_sha1_file(s->oid.hash, &type, &s->size);
+		s->data = read_object_file(&s->oid, &type, &s->size);
 		if (!s->data)
 			die("unable to read %s", oid_to_hex(&s->oid));
 		s->should_free = 1;
diff --git a/dir.c b/dir.c
index 536416ff2d..a4aef1deff 100644
--- a/dir.c
+++ b/dir.c
@@ -243,7 +243,7 @@ static int do_read_blob(const struct object_id *oid, struct oid_stat *oid_stat,
 	*size_out = 0;
 	*data_out = NULL;
 
-	data = read_sha1_file(oid->hash, &type, &sz);
+	data = read_object_file(oid, &type, &sz);
 	if (!data || type != OBJ_BLOB) {
 		free(data);
 		return -1;
diff --git a/entry.c b/entry.c
index 30211447ac..3f21d2c913 100644
--- a/entry.c
+++ b/entry.c
@@ -85,7 +85,7 @@ static int create_file(const char *path, unsigned int mode)
 static void *read_blob_entry(const struct cache_entry *ce, unsigned long *size)
 {
 	enum object_type type;
-	void *new = read_sha1_file(ce->oid.hash, &type, size);
+	void *new = read_object_file(&ce->oid, &type, size);
 
 	if (new) {
 		if (type == OBJ_BLOB)
diff --git a/fast-import.c b/fast-import.c
index 004a9c9f99..f1fdbac81a 100644
--- a/fast-import.c
+++ b/fast-import.c
@@ -1412,7 +1412,7 @@ static void load_tree(struct tree_entry *root)
 			die("Can't load tree %s", oid_to_hex(oid));
 	} else {
 		enum object_type type;
-		buf = read_sha1_file(oid->hash, &type, &size);
+		buf = read_object_file(oid, &type, &size);
 		if (!buf || type != OBJ_TREE)
 			die("Can't load tree %s", oid_to_hex(oid));
 	}
@@ -2967,7 +2967,7 @@ static void cat_blob(struct object_entry *oe, struct object_id *oid)
 	char *buf;
 
 	if (!oe || oe->pack_id == MAX_PACK_ID) {
-		buf = read_sha1_file(oid->hash, &type, &size);
+		buf = read_object_file(oid, &type, &size);
 	} else {
 		type = oe->type;
 		buf = gfi_unpack_entry(oe, &size);
@@ -3072,7 +3072,7 @@ static struct object_entry *dereference(struct object_entry *oe,
 		buf = gfi_unpack_entry(oe, &size);
 	} else {
 		enum object_type unused;
-		buf = read_sha1_file(oid->hash, &unused, &size);
+		buf = read_object_file(oid, &unused, &size);
 	}
 	if (!buf)
 		die("Can't load object %s", oid_to_hex(oid));
diff --git a/fsck.c b/fsck.c
index 032699e9ac..1e3724b0eb 100644
--- a/fsck.c
+++ b/fsck.c
@@ -811,7 +811,7 @@ static int fsck_tag_buffer(struct tag *tag, const char *data,
 		enum object_type type;
 
 		buffer = to_free =
-			read_sha1_file(tag->object.oid.hash, &type, &size);
+			read_object_file(&tag->object.oid, &type, &size);
 		if (!buffer)
 			return report(options, &tag->object,
 				FSCK_MSG_MISSING_TAG_OBJECT,
diff --git a/grep.c b/grep.c
index 3d7cd0e96f..b92a336591 100644
--- a/grep.c
+++ b/grep.c
@@ -2010,7 +2010,7 @@ static int grep_source_load_oid(struct grep_source *gs)
 	enum object_type type;
 
 	grep_read_lock();
-	gs->buf = read_sha1_file(gs->identifier, &type, &gs->size);
+	gs->buf = read_object_file(gs->identifier, &type, &gs->size);
 	grep_read_unlock();
 
 	if (!gs->buf)
diff --git a/http-push.c b/http-push.c
index 0913f8ab86..58dd57ffd3 100644
--- a/http-push.c
+++ b/http-push.c
@@ -361,7 +361,7 @@ static void start_put(struct transfer_request *request)
 	ssize_t size;
 	git_zstream stream;
 
-	unpacked = read_sha1_file(request->obj->oid.hash, &type, &len);
+	unpacked = read_object_file(&request->obj->oid, &type, &len);
 	hdrlen = xsnprintf(hdr, sizeof(hdr), "%s %lu", typename(type), len) + 1;
 
 	/* Set it up */
diff --git a/mailmap.c b/mailmap.c
index cb921b4db6..13f0d2884e 100644
--- a/mailmap.c
+++ b/mailmap.c
@@ -224,7 +224,7 @@ static int read_mailmap_blob(struct string_list *map,
 	if (get_oid(name, &oid) < 0)
 		return 0;
 
-	buf = read_sha1_file(oid.hash, &type, &size);
+	buf = read_object_file(&oid, &type, &size);
 	if (!buf)
 		return error("unable to read mailmap object at %s", name);
 	if (type != OBJ_BLOB)
diff --git a/match-trees.c b/match-trees.c
index 10d6c39d47..72cc2baa3f 100644
--- a/match-trees.c
+++ b/match-trees.c
@@ -54,7 +54,7 @@ static void *fill_tree_desc_strict(struct tree_desc *desc,
 	enum object_type type;
 	unsigned long size;
 
-	buffer = read_sha1_file(hash->hash, &type, &size);
+	buffer = read_object_file(hash, &type, &size);
 	if (!buffer)
 		die("unable to read tree (%s)", oid_to_hex(hash));
 	if (type != OBJ_TREE)
@@ -180,7 +180,7 @@ static int splice_tree(const struct object_id *oid1, const char *prefix,
 	if (*subpath)
 		subpath++;
 
-	buf = read_sha1_file(oid1->hash, &type, &sz);
+	buf = read_object_file(oid1, &type, &sz);
 	if (!buf)
 		die("cannot read tree %s", oid_to_hex(oid1));
 	init_tree_desc(&desc, buf, sz);
diff --git a/merge-blobs.c b/merge-blobs.c
index 9b6eac22e4..fa49c17287 100644
--- a/merge-blobs.c
+++ b/merge-blobs.c
@@ -11,7 +11,7 @@ static int fill_mmfile_blob(mmfile_t *f, struct blob *obj)
 	unsigned long size;
 	enum object_type type;
 
-	buf = read_sha1_file(obj->object.oid.hash, &type, &size);
+	buf = read_object_file(&obj->object.oid, &type, &size);
 	if (!buf)
 		return -1;
 	if (type != OBJ_BLOB) {
@@ -66,7 +66,7 @@ void *merge_blobs(const char *path, struct blob *base, struct blob *our, struct
 			return NULL;
 		if (!our)
 			our = their;
-		return read_sha1_file(our->object.oid.hash, &type, size);
+		return read_object_file(&our->object.oid, &type, size);
 	}
 
 	if (fill_mmfile_blob(&f1, our) < 0)
diff --git a/merge-recursive.c b/merge-recursive.c
index 85f8cbee99..c55401698d 100644
--- a/merge-recursive.c
+++ b/merge-recursive.c
@@ -842,7 +842,7 @@ static int update_file_flags(struct merge_options *o,
 			goto update_index;
 		}
 
-		buf = read_sha1_file(oid->hash, &type, &size);
+		buf = read_object_file(oid, &type, &size);
 		if (!buf)
 			return err(o, _("cannot read object %s '%s'"), oid_to_hex(oid), path);
 		if (type != OBJ_BLOB) {
@@ -1656,7 +1656,7 @@ static int read_oid_strbuf(struct merge_options *o,
 	void *buf;
 	enum object_type type;
 	unsigned long size;
-	buf = read_sha1_file(oid->hash, &type, &size);
+	buf = read_object_file(oid, &type, &size);
 	if (!buf)
 		return err(o, _("cannot read object %s"), oid_to_hex(oid));
 	if (type != OBJ_BLOB) {
diff --git a/notes-cache.c b/notes-cache.c
index 398e61d5e9..e61988e503 100644
--- a/notes-cache.c
+++ b/notes-cache.c
@@ -77,7 +77,7 @@ char *notes_cache_get(struct notes_cache *c, struct object_id *key_oid,
 	value_oid = get_note(&c->tree, key_oid);
 	if (!value_oid)
 		return NULL;
-	value = read_sha1_file(value_oid->hash, &type, &size);
+	value = read_object_file(value_oid, &type, &size);
 
 	*outsize = size;
 	return value;
diff --git a/notes-merge.c b/notes-merge.c
index c09c5e0e47..8e0726a941 100644
--- a/notes-merge.c
+++ b/notes-merge.c
@@ -322,7 +322,7 @@ static void write_note_to_worktree(const struct object_id *obj,
 {
 	enum object_type type;
 	unsigned long size;
-	void *buf = read_sha1_file(note->hash, &type, &size);
+	void *buf = read_object_file(note, &type, &size);
 
 	if (!buf)
 		die("cannot read note %s for object %s",
diff --git a/notes.c b/notes.c
index d25121a65d..a386d450c4 100644
--- a/notes.c
+++ b/notes.c
@@ -796,13 +796,13 @@ int combine_notes_concatenate(struct object_id *cur_oid,
 
 	/* read in both note blob objects */
 	if (!is_null_oid(new_oid))
-		new_msg = read_sha1_file(new_oid->hash, &new_type, &new_len);
+		new_msg = read_object_file(new_oid, &new_type, &new_len);
 	if (!new_msg || !new_len || new_type != OBJ_BLOB) {
 		free(new_msg);
 		return 0;
 	}
 	if (!is_null_oid(cur_oid))
-		cur_msg = read_sha1_file(cur_oid->hash, &cur_type, &cur_len);
+		cur_msg = read_object_file(cur_oid, &cur_type, &cur_len);
 	if (!cur_msg || !cur_len || cur_type != OBJ_BLOB) {
 		free(cur_msg);
 		free(new_msg);
@@ -858,7 +858,7 @@ static int string_list_add_note_lines(struct string_list *list,
 		return 0;
 
 	/* read_sha1_file NUL-terminates */
-	data = read_sha1_file(oid->hash, &t, &len);
+	data = read_object_file(oid, &t, &len);
 	if (t != OBJ_BLOB || !data || !len) {
 		free(data);
 		return t != OBJ_BLOB || !data;
@@ -1217,7 +1217,7 @@ static void format_note(struct notes_tree *t, const struct object_id *object_oid
 	if (!oid)
 		return;
 
-	if (!(msg = read_sha1_file(oid->hash, &type, &msglen)) || type != OBJ_BLOB) {
+	if (!(msg = read_object_file(oid, &type, &msglen)) || type != OBJ_BLOB) {
 		free(msg);
 		return;
 	}
diff --git a/object.c b/object.c
index be8f23271b..ea1a6f18e8 100644
--- a/object.c
+++ b/object.c
@@ -266,7 +266,7 @@ struct object *parse_object(const struct object_id *oid)
 		return lookup_object(oid->hash);
 	}
 
-	buffer = read_sha1_file(oid->hash, &type, &size);
+	buffer = read_object_file(oid, &type, &size);
 	if (buffer) {
 		struct object_id reploid;
 		hashcpy(reploid.hash, repl);
diff --git a/read-cache.c b/read-cache.c
index 28bf0db9d9..64d00e7fd0 100644
--- a/read-cache.c
+++ b/read-cache.c
@@ -184,7 +184,7 @@ static int ce_compare_link(const struct cache_entry *ce, size_t expected_size)
 	if (strbuf_readlink(&sb, ce->name, expected_size))
 		return -1;
 
-	buffer = read_sha1_file(ce->oid.hash, &type, &size);
+	buffer = read_object_file(&ce->oid, &type, &size);
 	if (buffer) {
 		if (size == sb.len)
 			match = memcmp(buffer, sb.buf, size);
@@ -2683,7 +2683,7 @@ void *read_blob_data_from_index(const struct index_state *istate,
 	}
 	if (pos < 0)
 		return NULL;
-	data = read_sha1_file(istate->cache[pos]->oid.hash, &type, &sz);
+	data = read_object_file(&istate->cache[pos]->oid, &type, &sz);
 	if (!data || type != OBJ_BLOB) {
 		free(data);
 		return NULL;
diff --git a/ref-filter.c b/ref-filter.c
index 62834f7153..07cc454d0f 100644
--- a/ref-filter.c
+++ b/ref-filter.c
@@ -728,7 +728,7 @@ int verify_ref_format(struct ref_format *format)
 static void *get_obj(const struct object_id *oid, struct object **obj, unsigned long *sz, int *eaten)
 {
 	enum object_type type;
-	void *buf = read_sha1_file(oid->hash, &type, sz);
+	void *buf = read_object_file(oid, &type, sz);
 
 	if (buf)
 		*obj = parse_object_buffer(oid, type, *sz, buf, eaten);
diff --git a/remote-testsvn.c b/remote-testsvn.c
index bcebb4c789..c4bb9a8ba9 100644
--- a/remote-testsvn.c
+++ b/remote-testsvn.c
@@ -61,7 +61,7 @@ static char *read_ref_note(const struct object_id *oid)
 	init_notes(NULL, notes_ref, NULL, 0);
 	if (!(note_oid = get_note(NULL, oid)))
 		return NULL;	/* note tree not found */
-	if (!(msg = read_sha1_file(note_oid->hash, &type, &msglen)))
+	if (!(msg = read_object_file(note_oid, &type, &msglen)))
 		error("Empty notes tree. %s", notes_ref);
 	else if (!msglen || type != OBJ_BLOB) {
 		error("Note contains unusable content. "
@@ -108,7 +108,7 @@ static int note2mark_cb(const struct object_id *object_oid,
 	enum object_type type;
 	struct rev_note note;
 
-	if (!(msg = read_sha1_file(note_oid->hash, &type, &msglen)) ||
+	if (!(msg = read_object_file(note_oid, &type, &msglen)) ||
 			!msglen || type != OBJ_BLOB) {
 		free(msg);
 		return 1;
diff --git a/rerere.c b/rerere.c
index 79203c6c1e..8af6b660e0 100644
--- a/rerere.c
+++ b/rerere.c
@@ -981,8 +981,8 @@ static int handle_cache(const char *path, unsigned char *sha1, const char *outpu
 			break;
 		i = ce_stage(ce) - 1;
 		if (!mmfile[i].ptr) {
-			mmfile[i].ptr = read_sha1_file(ce->oid.hash, &type,
-						       &size);
+			mmfile[i].ptr = read_object_file(&ce->oid, &type,
+							 &size);
 			mmfile[i].size = size;
 		}
 	}
diff --git a/sha1_file.c b/sha1_file.c
index bf8a713185..7493bc7f11 100644
--- a/sha1_file.c
+++ b/sha1_file.c
@@ -1363,17 +1363,17 @@ int pretend_object_file(void *buf, unsigned long len, enum object_type type,
  * deal with them should arrange to call read_object() and give error
  * messages themselves.
  */
-void *read_sha1_file_extended(const unsigned char *sha1,
-			      enum object_type *type,
-			      unsigned long *size,
-			      int lookup_replace)
+void *read_object_file_extended(const struct object_id *oid,
+				enum object_type *type,
+				unsigned long *size,
+				int lookup_replace)
 {
 	void *data;
 	const struct packed_git *p;
 	const char *path;
 	struct stat st;
-	const unsigned char *repl = lookup_replace ? lookup_replace_object(sha1)
-						   : sha1;
+	const unsigned char *repl = lookup_replace ? lookup_replace_object(oid->hash)
+						   : oid->hash;
 
 	errno = 0;
 	data = read_object(repl, type, size);
@@ -1381,12 +1381,12 @@ void *read_sha1_file_extended(const unsigned char *sha1,
 		return data;
 
 	if (errno && errno != ENOENT)
-		die_errno("failed to read object %s", sha1_to_hex(sha1));
+		die_errno("failed to read object %s", oid_to_hex(oid));
 
 	/* die if we replaced an object with one that does not exist */
-	if (repl != sha1)
+	if (repl != oid->hash)
 		die("replacement %s not found for %s",
-		    sha1_to_hex(repl), sha1_to_hex(sha1));
+		    sha1_to_hex(repl), oid_to_hex(oid));
 
 	if (!stat_sha1_file(repl, &st, &path))
 		die("loose object %s (stored in %s) is corrupt",
@@ -1415,7 +1415,7 @@ void *read_object_with_reference(const struct object_id *oid,
 		int ref_length = -1;
 		const char *ref_type = NULL;
 
-		buffer = read_sha1_file(actual_oid.hash, &type, &isize);
+		buffer = read_object_file(&actual_oid, &type, &isize);
 		if (!buffer)
 			return NULL;
 		if (type == required_type) {
diff --git a/streaming.c b/streaming.c
index 3f4be1ea2c..72a3ca8d08 100644
--- a/streaming.c
+++ b/streaming.c
@@ -492,7 +492,7 @@ static struct stream_vtbl incore_vtbl = {
 
 static open_method_decl(incore)
 {
-	st->u.incore.buf = read_sha1_file_extended(oid->hash, type, &st->size, 0);
+	st->u.incore.buf = read_object_file_extended(oid, type, &st->size, 0);
 	st->u.incore.read_ptr = 0;
 	st->vtbl = &incore_vtbl;
 
diff --git a/submodule-config.c b/submodule-config.c
index 2aa8a1747f..883e52a005 100644
--- a/submodule-config.c
+++ b/submodule-config.c
@@ -520,7 +520,7 @@ static const struct submodule *config_from(struct submodule_cache *cache,
 	if (submodule)
 		goto out;
 
-	config = read_sha1_file(oid.hash, &type, &config_size);
+	config = read_object_file(&oid, &type, &config_size);
 	if (!config || type != OBJ_BLOB)
 		goto out;
 
diff --git a/tag.c b/tag.c
index ea963e406a..0354a0cc7e 100644
--- a/tag.c
+++ b/tag.c
@@ -49,7 +49,7 @@ int gpg_verify_tag(const struct object_id *oid, const char *name_to_report,
 				find_unique_abbrev(oid, DEFAULT_ABBREV),
 				typename(type));
 
-	buf = read_sha1_file(oid->hash, &type, &size);
+	buf = read_object_file(oid, &type, &size);
 	if (!buf)
 		return error("%s: unable to read file.",
 				name_to_report ?
@@ -182,7 +182,7 @@ int parse_tag(struct tag *item)
 
 	if (item->object.parsed)
 		return 0;
-	data = read_sha1_file(item->object.oid.hash, &type, &size);
+	data = read_object_file(&item->object.oid, &type, &size);
 	if (!data)
 		return error("Could not read %s",
 			     oid_to_hex(&item->object.oid));
diff --git a/tree-walk.c b/tree-walk.c
index b7e504070c..e11b3063af 100644
--- a/tree-walk.c
+++ b/tree-walk.c
@@ -713,8 +713,8 @@ enum follow_symlinks_result get_tree_entry_follow_symlinks(unsigned char *tree_s
 			 */
 			retval = DANGLING_SYMLINK;
 
-			contents = read_sha1_file(current_tree_oid.hash, &type,
-						  &link_len);
+			contents = read_object_file(&current_tree_oid, &type,
+						    &link_len);
 
 			if (!contents)
 				goto done;
diff --git a/tree.c b/tree.c
index 1a0f03f520..1c68ea586b 100644
--- a/tree.c
+++ b/tree.c
@@ -219,7 +219,7 @@ int parse_tree_gently(struct tree *item, int quiet_on_missing)
 
 	if (item->object.parsed)
 		return 0;
-	buffer = read_sha1_file(item->object.oid.hash, &type, &size);
+	buffer = read_object_file(&item->object.oid, &type, &size);
 	if (!buffer)
 		return quiet_on_missing ? -1 :
 			error("Could not read %s",
diff --git a/xdiff-interface.c b/xdiff-interface.c
index 770e1f7f81..9315bc0ede 100644
--- a/xdiff-interface.c
+++ b/xdiff-interface.c
@@ -191,7 +191,7 @@ void read_mmblob(mmfile_t *ptr, const struct object_id *oid)
 		return;
 	}
 
-	ptr->ptr = read_sha1_file(oid->hash, &type, &size);
+	ptr->ptr = read_object_file(oid, &type, &size);
 	if (!ptr->ptr || type != OBJ_BLOB)
 		die("unable to read blob object %s", oid_to_hex(oid));
 	ptr->size = size;

[PATCH v2 34/36] Convert lookup_replace_object to struct object_id

[brian m. carlson]

Convert both the argument and the return value to be pointers to struct
object_id.  Update the callers and their internals to deal with the new
type.  Remove several temporaries which are no longer needed.

Signed-off-by: brian m. carlson <sandals@crustytoothpaste.net>
---
 builtin/mktag.c  |  7 ++-----
 cache.h          |  8 ++++----
 object.c         | 14 ++++----------
 replace_object.c | 14 +++++++-------
 sha1_file.c      | 44 ++++++++++++++++++++------------------------
 streaming.c      | 16 +++++-----------
 6 files changed, 42 insertions(+), 61 deletions(-)

diff --git a/builtin/mktag.c b/builtin/mktag.c
index cfb777b3c8..9f5a50a8fd 100644
--- a/builtin/mktag.c
+++ b/builtin/mktag.c
@@ -24,14 +24,11 @@ static int verify_object(const struct object_id *oid, const char *expected_type)
 	enum object_type type;
 	unsigned long size;
 	void *buffer = read_object_file(oid, &type, &size);
-	const unsigned char *repl = lookup_replace_object(oid->hash);
+	const struct object_id *repl = lookup_replace_object(oid);
 
 	if (buffer) {
-		struct object_id reploid;
-		hashcpy(reploid.hash, repl);
-
 		if (type == type_from_string(expected_type))
-			ret = check_object_signature(&reploid, buffer, size, expected_type);
+			ret = check_object_signature(repl, buffer, size, expected_type);
 		free(buffer);
 	}
 	return ret;
diff --git a/cache.h b/cache.h
index 970d6edd04..a70c52b22f 100644
--- a/cache.h
+++ b/cache.h
@@ -1197,7 +1197,7 @@ static inline void *read_object_file(const struct object_id *oid, enum object_ty
  * This internal function is only declared here for the benefit of
  * lookup_replace_object().  Please do not call it directly.
  */
-extern const unsigned char *do_lookup_replace_object(const unsigned char *sha1);
+extern const struct object_id *do_lookup_replace_object(const struct object_id *oid);
 
 /*
  * If object sha1 should be replaced, return the replacement object's
@@ -1205,11 +1205,11 @@ extern const unsigned char *do_lookup_replace_object(const unsigned char *sha1);
  * either sha1 or a pointer to a permanently-allocated value.  When
  * object replacement is suppressed, always return sha1.
  */
-static inline const unsigned char *lookup_replace_object(const unsigned char *sha1)
+static inline const struct object_id *lookup_replace_object(const struct object_id *oid)
 {
 	if (!check_replace_refs)
-		return sha1;
-	return do_lookup_replace_object(sha1);
+		return oid;
+	return do_lookup_replace_object(oid);
 }
 
 /* Read and unpack an object file into memory, write memory to an object file */
diff --git a/object.c b/object.c
index ea1a6f18e8..4e1c065d55 100644
--- a/object.c
+++ b/object.c
@@ -244,7 +244,7 @@ struct object *parse_object(const struct object_id *oid)
 	unsigned long size;
 	enum object_type type;
 	int eaten;
-	const unsigned char *repl = lookup_replace_object(oid->hash);
+	const struct object_id *repl = lookup_replace_object(oid);
 	void *buffer;
 	struct object *obj;
 
@@ -255,10 +255,7 @@ struct object *parse_object(const struct object_id *oid)
 	if ((obj && obj->type == OBJ_BLOB && has_object_file(oid)) ||
 	    (!obj && has_object_file(oid) &&
 	     oid_object_info(oid, NULL) == OBJ_BLOB)) {
-		struct object_id reploid;
-		hashcpy(reploid.hash, repl);
-
-		if (check_object_signature(&reploid, NULL, 0, NULL) < 0) {
+		if (check_object_signature(repl, NULL, 0, NULL) < 0) {
 			error("sha1 mismatch %s", oid_to_hex(oid));
 			return NULL;
 		}
@@ -268,12 +265,9 @@ struct object *parse_object(const struct object_id *oid)
 
 	buffer = read_object_file(oid, &type, &size);
 	if (buffer) {
-		struct object_id reploid;
-		hashcpy(reploid.hash, repl);
-
-		if (check_object_signature(&reploid, buffer, size, typename(type)) < 0) {
+		if (check_object_signature(repl, buffer, size, typename(type)) < 0) {
 			free(buffer);
-			error("sha1 mismatch %s", sha1_to_hex(repl));
+			error("sha1 mismatch %s", oid_to_hex(repl));
 			return NULL;
 		}
 
diff --git a/replace_object.c b/replace_object.c
index 232e8b8550..336357394d 100644
--- a/replace_object.c
+++ b/replace_object.c
@@ -92,16 +92,16 @@ static void prepare_replace_object(void)
 #define MAXREPLACEDEPTH 5
 
 /*
- * If a replacement for object sha1 has been set up, return the
+ * If a replacement for object oid has been set up, return the
  * replacement object's name (replaced recursively, if necessary).
- * The return value is either sha1 or a pointer to a
+ * The return value is either oid or a pointer to a
  * permanently-allocated value.  This function always respects replace
  * references, regardless of the value of check_replace_refs.
  */
-const unsigned char *do_lookup_replace_object(const unsigned char *sha1)
+const struct object_id *do_lookup_replace_object(const struct object_id *oid)
 {
 	int pos, depth = MAXREPLACEDEPTH;
-	const unsigned char *cur = sha1;
+	const struct object_id *cur = oid;
 
 	prepare_replace_object();
 
@@ -109,11 +109,11 @@ const unsigned char *do_lookup_replace_object(const unsigned char *sha1)
 	do {
 		if (--depth < 0)
 			die("replace depth too high for object %s",
-			    sha1_to_hex(sha1));
+			    oid_to_hex(oid));
 
-		pos = replace_object_pos(cur);
+		pos = replace_object_pos(cur->hash);
 		if (0 <= pos)
-			cur = replace_object[pos]->replacement.hash;
+			cur = &replace_object[pos]->replacement;
 	} while (0 <= pos);
 
 	return cur;
diff --git a/sha1_file.c b/sha1_file.c
index 7493bc7f11..c41fbe2f01 100644
--- a/sha1_file.c
+++ b/sha1_file.c
@@ -1227,22 +1227,18 @@ int oid_object_info_extended(const struct object_id *oid, struct object_info *oi
 	static struct object_info blank_oi = OBJECT_INFO_INIT;
 	struct pack_entry e;
 	int rtype;
-	const unsigned char *real = (flags & OBJECT_INFO_LOOKUP_REPLACE) ?
-				    lookup_replace_object(oid->hash) :
-				    oid->hash;
+	const struct object_id *real = (flags & OBJECT_INFO_LOOKUP_REPLACE) ?
+				       lookup_replace_object(oid) :
+				       oid;
 	int already_retried = 0;
-	struct object_id realoid;
-
-	hashcpy(realoid.hash, real);
-
-	if (is_null_sha1(real))
+	if (is_null_oid(real))
 		return -1;
 
 	if (!oi)
 		oi = &blank_oi;
 
 	if (!(flags & OBJECT_INFO_SKIP_CACHED)) {
-		struct cached_object *co = find_cached_object(real);
+		struct cached_object *co = find_cached_object(real->hash);
 		if (co) {
 			if (oi->typep)
 				*(oi->typep) = co->type;
@@ -1262,16 +1258,16 @@ int oid_object_info_extended(const struct object_id *oid, struct object_info *oi
 	}
 
 	while (1) {
-		if (find_pack_entry(real, &e))
+		if (find_pack_entry(real->hash, &e))
 			break;
 
 		/* Most likely it's a loose object. */
-		if (!sha1_loose_object_info(real, oi, flags))
+		if (!sha1_loose_object_info(real->hash, oi, flags))
 			return 0;
 
 		/* Not a loose object; someone else may have just packed it. */
 		reprepare_packed_git();
-		if (find_pack_entry(real, &e))
+		if (find_pack_entry(real->hash, &e))
 			break;
 
 		/* Check if it is a missing object */
@@ -1281,7 +1277,7 @@ int oid_object_info_extended(const struct object_id *oid, struct object_info *oi
 			 * TODO Investigate haveing fetch_object() return
 			 * TODO error/success and stopping the music here.
 			 */
-			fetch_object(repository_format_partial_clone, real);
+			fetch_object(repository_format_partial_clone, real->hash);
 			already_retried = 1;
 			continue;
 		}
@@ -1297,8 +1293,8 @@ int oid_object_info_extended(const struct object_id *oid, struct object_info *oi
 		return 0;
 	rtype = packed_object_info(e.p, e.offset, oi);
 	if (rtype < 0) {
-		mark_bad_packed_object(e.p, real);
-		return oid_object_info_extended(&realoid, oi, 0);
+		mark_bad_packed_object(e.p, real->hash);
+		return oid_object_info_extended(real, oi, 0);
 	} else if (oi->whence == OI_PACKED) {
 		oi->u.packed.offset = e.offset;
 		oi->u.packed.pack = e.p;
@@ -1372,11 +1368,11 @@ void *read_object_file_extended(const struct object_id *oid,
 	const struct packed_git *p;
 	const char *path;
 	struct stat st;
-	const unsigned char *repl = lookup_replace ? lookup_replace_object(oid->hash)
-						   : oid->hash;
+	const struct object_id *repl = lookup_replace ? lookup_replace_object(oid)
+						      : oid;
 
 	errno = 0;
-	data = read_object(repl, type, size);
+	data = read_object(repl->hash, type, size);
 	if (data)
 		return data;
 
@@ -1384,17 +1380,17 @@ void *read_object_file_extended(const struct object_id *oid,
 		die_errno("failed to read object %s", oid_to_hex(oid));
 
 	/* die if we replaced an object with one that does not exist */
-	if (repl != oid->hash)
+	if (repl != oid)
 		die("replacement %s not found for %s",
-		    sha1_to_hex(repl), oid_to_hex(oid));
+		    oid_to_hex(repl), oid_to_hex(oid));
 
-	if (!stat_sha1_file(repl, &st, &path))
+	if (!stat_sha1_file(repl->hash, &st, &path))
 		die("loose object %s (stored in %s) is corrupt",
-		    sha1_to_hex(repl), path);
+		    oid_to_hex(repl), path);
 
-	if ((p = has_packed_and_bad(repl)) != NULL)
+	if ((p = has_packed_and_bad(repl->hash)) != NULL)
 		die("packed object %s (stored in %s) is corrupt",
-		    sha1_to_hex(repl), p->pack_name);
+		    oid_to_hex(repl), p->pack_name);
 
 	return NULL;
 }
diff --git a/streaming.c b/streaming.c
index 72a3ca8d08..46fabee3aa 100644
--- a/streaming.c
+++ b/streaming.c
@@ -105,19 +105,16 @@ ssize_t read_istream(struct git_istream *st, void *buf, size_t sz)
 	return st->vtbl->read(st, buf, sz);
 }
 
-static enum input_source istream_source(const unsigned char *sha1,
+static enum input_source istream_source(const struct object_id *oid,
 					enum object_type *type,
 					struct object_info *oi)
 {
 	unsigned long size;
 	int status;
-	struct object_id oid;
-
-	hashcpy(oid.hash, sha1);
 
 	oi->typep = type;
 	oi->sizep = &size;
-	status = oid_object_info_extended(&oid, oi, 0);
+	status = oid_object_info_extended(oid, oi, 0);
 	if (status < 0)
 		return stream_error;
 
@@ -140,18 +137,15 @@ struct git_istream *open_istream(const struct object_id *oid,
 {
 	struct git_istream *st;
 	struct object_info oi = OBJECT_INFO_INIT;
-	const unsigned char *real = lookup_replace_object(oid->hash);
+	const struct object_id *real = lookup_replace_object(oid);
 	enum input_source src = istream_source(real, type, &oi);
-	struct object_id realoid;
-
-	hashcpy(realoid.hash, real);
 
 	if (src < 0)
 		return NULL;
 
 	st = xmalloc(sizeof(*st));
-	if (open_istream_tbl[src](st, &oi, &realoid, type)) {
-		if (open_istream_incore(st, &oi, &realoid, type)) {
+	if (open_istream_tbl[src](st, &oi, real, type)) {
+		if (open_istream_incore(st, &oi, real, type)) {
 			free(st);
 			return NULL;
 		}

[PATCH v2 35/36] sha1_file: introduce a constant for max header length

[brian m. carlson]

There were several instances of 32 sprinkled throughout this file, all
of which were used for allocating a buffer to store the header of an
object.  Introduce a constant, MAX_HEADER_LEN, for this purpose.

Note that this constant is slightly larger than required; the longest
possible header is 28 (7 for "commit", 1 for a space, 20 for a 63-bit
length in decimal, and 1 for the NUL).  However, the overallocation
should not cause any problems, so leave it as it is.

Signed-off-by: brian m. carlson <sandals@crustytoothpaste.net>
---
 sha1_file.c | 17 ++++++++++-------
 1 file changed, 10 insertions(+), 7 deletions(-)

diff --git a/sha1_file.c b/sha1_file.c
index c41fbe2f01..4d4f9248c7 100644
--- a/sha1_file.c
+++ b/sha1_file.c
@@ -30,6 +30,9 @@
 #include "packfile.h"
 #include "fetch-object.h"
 
+/* The maximum size for an object header. */
+#define MAX_HEADER_LEN 32
+
 const unsigned char null_sha1[GIT_MAX_RAWSZ];
 const struct object_id null_oid;
 const struct object_id empty_tree_oid = {
@@ -791,7 +794,7 @@ int check_object_signature(const struct object_id *oid, void *map,
 	enum object_type obj_type;
 	struct git_istream *st;
 	git_hash_ctx c;
-	char hdr[32];
+	char hdr[MAX_HEADER_LEN];
 	int hdrlen;
 
 	if (map) {
@@ -1150,7 +1153,7 @@ static int sha1_loose_object_info(const unsigned char *sha1,
 	unsigned long mapsize;
 	void *map;
 	git_zstream stream;
-	char hdr[32];
+	char hdr[MAX_HEADER_LEN];
 	struct strbuf hdrbuf = STRBUF_INIT;
 	unsigned long size_scratch;
 
@@ -1512,7 +1515,7 @@ static int write_buffer(int fd, const void *buf, size_t len)
 int hash_object_file(const void *buf, unsigned long len, const char *type,
 		     struct object_id *oid)
 {
-	char hdr[32];
+	char hdr[MAX_HEADER_LEN];
 	int hdrlen = sizeof(hdr);
 	write_object_file_prepare(buf, len, type, oid, hdr, &hdrlen);
 	return 0;
@@ -1667,7 +1670,7 @@ static int freshen_packed_object(const unsigned char *sha1)
 int write_object_file(const void *buf, unsigned long len, const char *type,
 		      struct object_id *oid)
 {
-	char hdr[32];
+	char hdr[MAX_HEADER_LEN];
 	int hdrlen = sizeof(hdr);
 
 	/* Normally if we have it in the pack then we do not bother writing
@@ -1687,7 +1690,7 @@ int hash_object_file_literally(const void *buf, unsigned long len,
 	int hdrlen, status = 0;
 
 	/* type string, SP, %lu of the length plus NUL must fit this */
-	hdrlen = strlen(type) + 32;
+	hdrlen = strlen(type) + MAX_HEADER_LEN;
 	header = xmalloc(hdrlen);
 	write_object_file_prepare(buf, len, type, oid, header, &hdrlen);
 
@@ -1707,7 +1710,7 @@ int force_object_loose(const struct object_id *oid, time_t mtime)
 	void *buf;
 	unsigned long len;
 	enum object_type type;
-	char hdr[32];
+	char hdr[MAX_HEADER_LEN];
 	int hdrlen;
 	int ret;
 
@@ -2189,7 +2192,7 @@ int read_loose_object(const char *path,
 	void *map = NULL;
 	unsigned long mapsize;
 	git_zstream stream;
-	char hdr[32];
+	char hdr[MAX_HEADER_LEN];
 
 	*contents = NULL;
 

[PATCH v2 36/36] convert: convert to struct object_id

[brian m. carlson]

Convert convert.c to struct object_id.  Add a use of the_hash_algo to
replace hard-coded constants and change a strbuf_add to a strbuf_addstr
to avoid another hard-coded constant.

Note that a strict conversion using the hexsz constant would cause
problems in the future if the internal and user-visible hash algorithms
differed, as anticipated by the hash function transition plan.

Signed-off-by: brian m. carlson <sandals@crustytoothpaste.net>
---
 convert.c | 12 ++++++------
 convert.h |  2 +-
 entry.c   |  2 +-
 3 files changed, 8 insertions(+), 8 deletions(-)

diff --git a/convert.c b/convert.c
index cc562f6509..c480097a2a 100644
--- a/convert.c
+++ b/convert.c
@@ -914,7 +914,7 @@ static int ident_to_worktree(const char *path, const char *src, size_t len,
 		to_free = strbuf_detach(buf, NULL);
 	hash_object_file(src, len, "blob", &oid);
 
-	strbuf_grow(buf, len + cnt * 43);
+	strbuf_grow(buf, len + cnt * (the_hash_algo->hexsz + 3));
 	for (;;) {
 		/* step 1: run to the next '$' */
 		dollar = memchr(src, '$', len);
@@ -1510,7 +1510,7 @@ struct ident_filter {
 	struct stream_filter filter;
 	struct strbuf left;
 	int state;
-	char ident[45]; /* ": x40 $" */
+	char ident[GIT_MAX_HEXSZ + 5]; /* ": x40 $" */
 };
 
 static int is_foreign_ident(const char *str)
@@ -1635,12 +1635,12 @@ static struct stream_filter_vtbl ident_vtbl = {
 	ident_free_fn,
 };
 
-static struct stream_filter *ident_filter(const unsigned char *sha1)
+static struct stream_filter *ident_filter(const struct object_id *oid)
 {
 	struct ident_filter *ident = xmalloc(sizeof(*ident));
 
 	xsnprintf(ident->ident, sizeof(ident->ident),
-		  ": %s $", sha1_to_hex(sha1));
+		  ": %s $", oid_to_hex(oid));
 	strbuf_init(&ident->left, 0);
 	ident->filter.vtbl = &ident_vtbl;
 	ident->state = 0;
@@ -1655,7 +1655,7 @@ static struct stream_filter *ident_filter(const unsigned char *sha1)
  * Note that you would be crazy to set CRLF, smuge/clean or ident to a
  * large binary blob you would want us not to slurp into the memory!
  */
-struct stream_filter *get_stream_filter(const char *path, const unsigned char *sha1)
+struct stream_filter *get_stream_filter(const char *path, const struct object_id *oid)
 {
 	struct conv_attrs ca;
 	struct stream_filter *filter = NULL;
@@ -1668,7 +1668,7 @@ struct stream_filter *get_stream_filter(const char *path, const unsigned char *s
 		return NULL;
 
 	if (ca.ident)
-		filter = ident_filter(sha1);
+		filter = ident_filter(oid);
 
 	if (output_eol(ca.crlf_action) == EOL_CRLF)
 		filter = cascade_filter(filter, lf_to_crlf_filter());
diff --git a/convert.h b/convert.h
index 65ab3e5167..2e9b4f49cc 100644
--- a/convert.h
+++ b/convert.h
@@ -93,7 +93,7 @@ extern int would_convert_to_git_filter_fd(const char *path);
 
 struct stream_filter; /* opaque */
 
-extern struct stream_filter *get_stream_filter(const char *path, const unsigned char *);
+extern struct stream_filter *get_stream_filter(const char *path, const struct object_id *);
 extern void free_stream_filter(struct stream_filter *);
 extern int is_null_stream_filter(struct stream_filter *);
 
diff --git a/entry.c b/entry.c
index 3f21d2c913..49b83f4a97 100644
--- a/entry.c
+++ b/entry.c
@@ -266,7 +266,7 @@ static int write_entry(struct cache_entry *ce,
 
 	if (ce_mode_s_ifmt == S_IFREG) {
 		struct stream_filter *filter = get_stream_filter(ce->name,
-								 ce->oid.hash);
+								 &ce->oid);
 		if (filter &&
 		    !streaming_write_entry(ce, path, filter,
 					   state, to_tempfile,

Re: [PATCH v2 04/36] cache-tree: convert remnants to struct object_id

[Duy Nguyen]

On Mon, Feb 26, 2018 at 4:11 AM, brian m. carlson
<sandals@crustytoothpaste.net> wrote:
> @@ -465,7 +465,7 @@ static void write_one(struct strbuf *buffer, struct cache_tree *it,
>  #endif
>
>         if (0 <= it->entry_count) {
> -               strbuf_add(buffer, it->oid.hash, 20);
> +               strbuf_add(buffer, it->oid.hash, the_hash_algo->rawsz);
>         }
>         for (i = 0; i < it->subtree_nr; i++) {
>                 struct cache_tree_sub *down = it->down[i];
> @@ -520,11 +520,11 @@ static struct cache_tree *read_one(const char **buffer, unsigned long *size_p)
>                 goto free_return;
>         buf++; size--;
>         if (0 <= it->entry_count) {
> -               if (size < 20)
> +               if (size < the_hash_algo->rawsz)
>                         goto free_return;
>                 hashcpy(it->oid.hash, (const unsigned char*)buf);
> -               buf += 20;
> -               size -= 20;
> +               buf += the_hash_algo->rawsz;
> +               size -= the_hash_algo->rawsz;
>         }

This looks a bit strange that everything else is now with hash
abstraction, except that it->oid is still copied with hashcpy(). But I
guess we don't have an equivalent for that function yet..

But since it->oid.hash is copied to buffer with strbuf_add() in the
top chunk, maybe we can do memcpy() here with the_hash_algo ->rawsz
too?
-- 
Duy

Re: [PATCH v2 05/36] resolve-undo: convert struct resolve_undo_info to object_id

[Duy Nguyen]

On Mon, Feb 26, 2018 at 4:11 AM, brian m. carlson
<sandals@crustytoothpaste.net> wrote:
> @@ -44,7 +44,7 @@ void resolve_undo_write(struct strbuf *sb, struct string_list *resolve_undo)
>                 for (i = 0; i < 3; i++) {
>                         if (!ui->mode[i])
>                                 continue;
> -                       strbuf_add(sb, ui->sha1[i], 20);
> +                       strbuf_add(sb, ui->oid[i].hash, the_hash_algo->rawsz);
>                 }
>         }
>  }
> @@ -89,7 +89,7 @@ struct string_list *resolve_undo_read(const char *data, unsigned long size)
>                                 continue;
>                         if (size < 20)
>                                 goto error;
> -                       hashcpy(ui->sha1[i], (const unsigned char *)data);
> +                       hashcpy(ui->oid[i].hash, (const unsigned char *)data);
>                         size -= 20;
>                         data += 20;
>                 }

Here we see the same pattern again, but this time the @@ lines give
better context: these are actually hash I/O. Maybe it's about time we
add

int oidwrite(char *, size_t , const struct object_id *);
// optionally, void strbuf_addoid(struct strbuf *, const struct object_id *);
int oidread(struct object_id *, const char *, size_t);

for conversion from between an object_id in memory and on disk? It
would probably be a straight memcpy for all hash algorithms so we
don't really need new function pointers in git_hash_algo for this.
-- 
Duy

Re: [PATCH v2 34/36] Convert lookup_replace_object to struct object_id

[Duy Nguyen]

On Mon, Feb 26, 2018 at 4:12 AM, brian m. carlson
<sandals@crustytoothpaste.net> wrote:
> diff --git a/sha1_file.c b/sha1_file.c
> index 7493bc7f11..c41fbe2f01 100644
> --- a/sha1_file.c
> +++ b/sha1_file.c
> @@ -1227,22 +1227,18 @@ int oid_object_info_extended(const struct object_id *oid, struct object_info *oi
>         static struct object_info blank_oi = OBJECT_INFO_INIT;
>         struct pack_entry e;
>         int rtype;
> -       const unsigned char *real = (flags & OBJECT_INFO_LOOKUP_REPLACE) ?
> -                                   lookup_replace_object(oid->hash) :
> -                                   oid->hash;
> +       const struct object_id *real = (flags & OBJECT_INFO_LOOKUP_REPLACE) ?
> +                                      lookup_replace_object(oid) :
> +                                      oid;

Micro nit. Perhaps we should replace "? :" with a real "if" construct
-- 
Duy

Re: [PATCH v2 05/36] resolve-undo: convert struct resolve_undo_info to object_id

[brian m. carlson]

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On Mon, Feb 26, 2018 at 06:25:24PM +0700, Duy Nguyen wrote:
> On Mon, Feb 26, 2018 at 4:11 AM, brian m. carlson
> <sandals@crustytoothpaste.net> wrote:
> > @@ -44,7 +44,7 @@ void resolve_undo_write(struct strbuf *sb, struct string_list *resolve_undo)
> >                 for (i = 0; i < 3; i++) {
> >                         if (!ui->mode[i])
> >                                 continue;
> > -                       strbuf_add(sb, ui->sha1[i], 20);
> > +                       strbuf_add(sb, ui->oid[i].hash, the_hash_algo->rawsz);
> >                 }
> >         }
> >  }
> > @@ -89,7 +89,7 @@ struct string_list *resolve_undo_read(const char *data, unsigned long size)
> >                                 continue;
> >                         if (size < 20)
> >                                 goto error;
> > -                       hashcpy(ui->sha1[i], (const unsigned char *)data);
> > +                       hashcpy(ui->oid[i].hash, (const unsigned char *)data);
> >                         size -= 20;
> >                         data += 20;
> >                 }

It looks like I may have missed a conversion there.  I'll fix that in a
reroll.

> Here we see the same pattern again, but this time the @@ lines give
> better context: these are actually hash I/O. Maybe it's about time we
> add
> 
> int oidwrite(char *, size_t , const struct object_id *);
> // optionally, void strbuf_addoid(struct strbuf *, const struct object_id *);
> int oidread(struct object_id *, const char *, size_t);
> 
> for conversion from between an object_id in memory and on disk? It
> would probably be a straight memcpy for all hash algorithms so we
> don't really need new function pointers in git_hash_algo for this.

I don't have a strong opinion about adding those or not adding them; if
people think it makes the code cleaner to read, I'm happy to add them.
It would probably makes sense to make them inline if we do, so that the
compiler can optimize them best.

I think we do need to preserve hashcpy anyway for a handful of cases
(such as pack checksums and rerere) that aren't technically object IDs
and won't use those functions.  I encountered a similar experience with
get_sha1_hex recently: there are a handful of cases that want to read
the name of a pack or a rerere cache, which are not object IDs.
-- 
brian m. carlson / brian with sandals: Houston, Texas, US
https://www.crustytoothpaste.net/~bmc | My opinion only
OpenPGP: https://keybase.io/bk2204

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Re: [PATCH v2 05/36] resolve-undo: convert struct resolve_undo_info to object_id

[Duy Nguyen]

On Tue, Feb 27, 2018 at 9:01 AM, brian m. carlson
<sandals@crustytoothpaste.net> wrote:
> On Mon, Feb 26, 2018 at 06:25:24PM +0700, Duy Nguyen wrote:
>> On Mon, Feb 26, 2018 at 4:11 AM, brian m. carlson
>> <sandals@crustytoothpaste.net> wrote:
>> > @@ -44,7 +44,7 @@ void resolve_undo_write(struct strbuf *sb, struct string_list *resolve_undo)
>> >                 for (i = 0; i < 3; i++) {
>> >                         if (!ui->mode[i])
>> >                                 continue;
>> > -                       strbuf_add(sb, ui->sha1[i], 20);
>> > +                       strbuf_add(sb, ui->oid[i].hash, the_hash_algo->rawsz);
>> >                 }
>> >         }
>> >  }
>> > @@ -89,7 +89,7 @@ struct string_list *resolve_undo_read(const char *data, unsigned long size)
>> >                                 continue;
>> >                         if (size < 20)
>> >                                 goto error;
>> > -                       hashcpy(ui->sha1[i], (const unsigned char *)data);
>> > +                       hashcpy(ui->oid[i].hash, (const unsigned char *)data);
>> >                         size -= 20;
>> >                         data += 20;
>> >                 }
>
> It looks like I may have missed a conversion there.  I'll fix that in a
> reroll.
>
>> Here we see the same pattern again, but this time the @@ lines give
>> better context: these are actually hash I/O. Maybe it's about time we
>> add
>>
>> int oidwrite(char *, size_t , const struct object_id *);
>> // optionally, void strbuf_addoid(struct strbuf *, const struct object_id *);
>> int oidread(struct object_id *, const char *, size_t);
>>
>> for conversion from between an object_id in memory and on disk? It
>> would probably be a straight memcpy for all hash algorithms so we
>> don't really need new function pointers in git_hash_algo for this.
>
> I don't have a strong opinion about adding those or not adding them; if
> people think it makes the code cleaner to read, I'm happy to add them.
> It would probably makes sense to make them inline if we do, so that the
> compiler can optimize them best.

FWIW I'm totally ok with a memcpy(&oid.hash, ..., rawsz); here and not
adding oidread/oidwrite. It's probably best to not adding them this
early anyway. We can always grep memcpy.*rawsz and refactor later.
-- 
Duy