From: "brian m. carlson" <sandals@crustytoothpaste.net>
To: git@vger.kernel.org
Cc: "Michael Haggerty" <mhagger@alum.mit.edu>,
"Jonathan Tan" <jonathantanmy@google.com>,
"Stefan Beller" <sbeller@google.com>, "Jeff King" <peff@peff.net>,
"Nguyễn Thái Ngọc Duy" <pclouds@gmail.com>,
"Brandon Williams" <bmwill@google.com>
Subject: [PATCH v3 35/53] Convert the verify_pack callback to struct object_id
Date: Sat, 6 May 2017 22:10:20 +0000 [thread overview]
Message-ID: <20170506221038.296722-36-sandals@crustytoothpaste.net> (raw)
In-Reply-To: <20170506221038.296722-1-sandals@crustytoothpaste.net>
Make the verify_pack_callback take a pointer to struct object_id.
Change the pack checksum to use GIT_MAX_RAWSZ, even though it is not
strictly an object ID. Doing so ensures resilience against future hash
size changes, and allows us to remove hard-coded assumptions about how
big the buffer needs to be.
Also, use a union to convert the pointer from nth_packed_object_sha1 to
to a pointer to struct object_id. This behavior is compatible with GCC
and clang and explicitly sanctioned by C11. The alternatives are to
just perform a cast, which would run afoul of strict aliasing rules, but
should just work, and changing the pointer into an instance of struct
object_id and copying the value. The latter operation could seriously
bloat memory usage on fsck, which already uses a lot of memory on some
repositories.
Signed-off-by: brian m. carlson <sandals@crustytoothpaste.net>
---
builtin/fsck.c | 6 +++---
pack-check.c | 25 ++++++++++++++-----------
pack.h | 2 +-
3 files changed, 18 insertions(+), 15 deletions(-)
diff --git a/builtin/fsck.c b/builtin/fsck.c
index 2f67e8217..a187054da 100644
--- a/builtin/fsck.c
+++ b/builtin/fsck.c
@@ -377,7 +377,7 @@ static int fsck_obj(struct object *obj)
return 0;
}
-static int fsck_obj_buffer(const unsigned char *sha1, enum object_type type,
+static int fsck_obj_buffer(const struct object_id *oid, enum object_type type,
unsigned long size, void *buffer, int *eaten)
{
/*
@@ -385,10 +385,10 @@ static int fsck_obj_buffer(const unsigned char *sha1, enum object_type type,
* verify_packfile(), data_valid variable for details.
*/
struct object *obj;
- obj = parse_object_buffer(sha1, type, size, buffer, eaten);
+ obj = parse_object_buffer(oid->hash, type, size, buffer, eaten);
if (!obj) {
errors_found |= ERROR_OBJECT;
- return error("%s: object corrupt or missing", sha1_to_hex(sha1));
+ return error("%s: object corrupt or missing", oid_to_hex(oid));
}
obj->flags = HAS_OBJ;
return fsck_obj(obj);
diff --git a/pack-check.c b/pack-check.c
index 27f70d345..e1fcb228f 100644
--- a/pack-check.c
+++ b/pack-check.c
@@ -5,7 +5,10 @@
struct idx_entry {
off_t offset;
- const unsigned char *sha1;
+ union idx_entry_object {
+ const unsigned char *hash;
+ struct object_id *oid;
+ } oid;
unsigned int nr;
};
@@ -51,7 +54,7 @@ static int verify_packfile(struct packed_git *p,
off_t index_size = p->index_size;
const unsigned char *index_base = p->index_data;
git_SHA_CTX ctx;
- unsigned char sha1[20], *pack_sig;
+ unsigned char hash[GIT_MAX_RAWSZ], *pack_sig;
off_t offset = 0, pack_sig_ofs = 0;
uint32_t nr_objects, i;
int err = 0;
@@ -71,9 +74,9 @@ static int verify_packfile(struct packed_git *p,
remaining -= (unsigned int)(offset - pack_sig_ofs);
git_SHA1_Update(&ctx, in, remaining);
} while (offset < pack_sig_ofs);
- git_SHA1_Final(sha1, &ctx);
+ git_SHA1_Final(hash, &ctx);
pack_sig = use_pack(p, w_curs, pack_sig_ofs, NULL);
- if (hashcmp(sha1, pack_sig))
+ if (hashcmp(hash, pack_sig))
err = error("%s SHA1 checksum mismatch",
p->pack_name);
if (hashcmp(index_base + index_size - 40, pack_sig))
@@ -90,8 +93,8 @@ static int verify_packfile(struct packed_git *p,
entries[nr_objects].offset = pack_sig_ofs;
/* first sort entries by pack offset, since unpacking them is more efficient that way */
for (i = 0; i < nr_objects; i++) {
- entries[i].sha1 = nth_packed_object_sha1(p, i);
- if (!entries[i].sha1)
+ entries[i].oid.hash = nth_packed_object_sha1(p, i);
+ if (!entries[i].oid.hash)
die("internal error pack-check nth-packed-object");
entries[i].offset = nth_packed_object_offset(p, i);
entries[i].nr = i;
@@ -112,7 +115,7 @@ static int verify_packfile(struct packed_git *p,
if (check_pack_crc(p, w_curs, offset, len, nr))
err = error("index CRC mismatch for object %s "
"from %s at offset %"PRIuMAX"",
- sha1_to_hex(entries[i].sha1),
+ oid_to_hex(entries[i].oid.oid),
p->pack_name, (uintmax_t)offset);
}
@@ -135,14 +138,14 @@ static int verify_packfile(struct packed_git *p,
if (data_valid && !data)
err = error("cannot unpack %s from %s at offset %"PRIuMAX"",
- sha1_to_hex(entries[i].sha1), p->pack_name,
+ oid_to_hex(entries[i].oid.oid), p->pack_name,
(uintmax_t)entries[i].offset);
- else if (check_sha1_signature(entries[i].sha1, data, size, typename(type)))
+ else if (check_sha1_signature(entries[i].oid.hash, data, size, typename(type)))
err = error("packed %s from %s is corrupt",
- sha1_to_hex(entries[i].sha1), p->pack_name);
+ oid_to_hex(entries[i].oid.oid), p->pack_name);
else if (fn) {
int eaten = 0;
- err |= fn(entries[i].sha1, type, size, data, &eaten);
+ err |= fn(entries[i].oid.oid, type, size, data, &eaten);
if (eaten)
data = NULL;
}
diff --git a/pack.h b/pack.h
index c7de42ef3..8294341af 100644
--- a/pack.h
+++ b/pack.h
@@ -75,7 +75,7 @@ struct pack_idx_entry {
struct progress;
/* Note, the data argument could be NULL if object type is blob */
-typedef int (*verify_fn)(const unsigned char*, enum object_type, unsigned long, void*, int*);
+typedef int (*verify_fn)(const struct object_id *, enum object_type, unsigned long, void*, int*);
extern const char *write_idx_file(const char *index_name, struct pack_idx_entry **objects, int nr_objects, const struct pack_idx_option *, const unsigned char *sha1);
extern int check_pack_crc(struct packed_git *p, struct pack_window **w_curs, off_t offset, off_t len, unsigned int nr);
next prev parent reply other threads:[~2017-05-06 22:12 UTC|newest]
Thread overview: 56+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-05-06 22:09 [PATCH v3 00/53] object_id part 8 brian m. carlson
2017-05-06 22:09 ` [PATCH v3 01/53] fetch-pack: convert to struct object_id brian m. carlson
2017-05-06 22:09 ` [PATCH v3 02/53] Clean up outstanding object_id transforms brian m. carlson
2017-05-06 22:09 ` [PATCH v3 03/53] Convert struct cache_tree to use struct object_id brian m. carlson
2017-05-06 22:09 ` [PATCH v3 04/53] builtin/name-rev: convert to " brian m. carlson
2017-05-06 22:09 ` [PATCH v3 05/53] builtin/prune: " brian m. carlson
2017-05-06 22:09 ` [PATCH v3 06/53] bundle: " brian m. carlson
2017-05-06 22:09 ` [PATCH v3 07/53] branch: " brian m. carlson
2017-05-06 22:09 ` [PATCH v3 08/53] builtin/blame: convert static function " brian m. carlson
2017-05-06 22:09 ` [PATCH v3 09/53] builtin/rev-parse: convert " brian m. carlson
2017-05-06 22:09 ` [PATCH v3 10/53] fast-import: convert internal structs " brian m. carlson
2017-05-06 22:09 ` [PATCH v3 11/53] fast-import: convert " brian m. carlson
2017-05-06 22:09 ` [PATCH v3 12/53] submodule: convert merge_submodule to use " brian m. carlson
2017-05-06 22:09 ` [PATCH v3 13/53] notes-cache: convert to " brian m. carlson
2017-05-06 22:09 ` [PATCH v3 14/53] parse-options-cb: " brian m. carlson
2017-05-06 22:10 ` [PATCH v3 15/53] reflog_expire: " brian m. carlson
2017-05-06 22:10 ` [PATCH v3 16/53] builtin/verify-commit: " brian m. carlson
2017-05-06 22:10 ` [PATCH v3 17/53] tag: convert parse_tag_buffer " brian m. carlson
2017-05-06 22:10 ` [PATCH v3 18/53] http-push: convert some static functions " brian m. carlson
2017-05-06 22:10 ` [PATCH v3 19/53] notes-utils: convert internals " brian m. carlson
2017-05-06 22:10 ` [PATCH v3 20/53] revision: convert prepare_show_merge " brian m. carlson
2017-05-06 22:10 ` [PATCH v3 21/53] shallow: convert shallow registration functions to object_id brian m. carlson
2017-05-06 22:10 ` [PATCH v3 22/53] sequencer: convert some functions to struct object_id brian m. carlson
2017-05-06 22:10 ` [PATCH v3 23/53] builtin/tag: convert " brian m. carlson
2017-05-06 22:10 ` [PATCH v3 24/53] Convert remaining callers of lookup_commit_reference* to object_id brian m. carlson
2017-05-06 22:10 ` [PATCH v3 25/53] Convert lookup_commit* to struct object_id brian m. carlson
2017-05-06 22:10 ` [PATCH v3 26/53] pack: convert struct pack_idx_entry " brian m. carlson
2017-05-06 22:10 ` [PATCH v3 27/53] builtin/unpack-objects: convert " brian m. carlson
2017-05-06 22:10 ` [PATCH v3 28/53] Convert remaining callers of lookup_blob to object_id brian m. carlson
2017-05-06 22:10 ` [PATCH v3 29/53] Convert lookup_blob to struct object_id brian m. carlson
2017-05-06 22:10 ` [PATCH v3 30/53] tree: convert read_tree_1 to use struct object_id internally brian m. carlson
2017-05-06 22:10 ` [PATCH v3 31/53] builtin/reflog: convert tree_is_complete to take struct object_id brian m. carlson
2017-05-06 22:10 ` [PATCH v3 32/53] Convert lookup_tree to " brian m. carlson
2017-05-06 22:10 ` [PATCH v3 33/53] log-tree: convert " brian m. carlson
2017-05-06 22:10 ` [PATCH v3 34/53] Convert lookup_tag " brian m. carlson
2017-05-06 22:10 ` brian m. carlson [this message]
2017-05-06 22:10 ` [PATCH v3 36/53] Convert struct ref_array_item " brian m. carlson
2017-05-06 22:10 ` [PATCH v3 37/53] ref-filter: convert some static functions " brian m. carlson
2017-05-06 22:10 ` [PATCH v3 38/53] refs: convert struct ref_update to use " brian m. carlson
2017-05-06 22:10 ` [PATCH v3 39/53] refs/files-backend: convert many internals to " brian m. carlson
2017-05-06 22:10 ` [PATCH v3 40/53] http-push: convert process_ls_object and descendants to object_id brian m. carlson
2017-05-06 22:10 ` [PATCH v3 41/53] revision: rename add_pending_sha1 to add_pending_oid brian m. carlson
2017-05-06 22:10 ` [PATCH v3 42/53] revision: convert remaining parse_object callers to object_id brian m. carlson
2017-05-06 22:10 ` [PATCH v3 43/53] upload-pack: " brian m. carlson
2017-05-06 22:10 ` [PATCH v3 44/53] sha1_name: convert internals of peel_onion " brian m. carlson
2017-05-06 22:10 ` [PATCH v3 45/53] builtin/read-tree: convert to struct object_id brian m. carlson
2017-05-06 22:10 ` [PATCH v3 46/53] builtin/ls-files: convert overlay_tree_on_cache to object_id brian m. carlson
2017-05-06 22:10 ` [PATCH v3 47/53] sequencer: convert fast_forward_to to struct object_id brian m. carlson
2017-05-06 22:10 ` [PATCH v3 48/53] merge: convert checkout_fast_forward " brian m. carlson
2017-05-06 22:10 ` [PATCH v3 49/53] builtin/ls-tree: convert " brian m. carlson
2017-05-06 22:10 ` [PATCH v3 50/53] diff-lib: convert do_diff_cache " brian m. carlson
2017-05-06 22:10 ` [PATCH v3 51/53] sequencer: convert do_recursive_merge " brian m. carlson
2017-05-06 22:10 ` [PATCH v3 52/53] tree: convert parse_tree_indirect " brian m. carlson
2017-05-06 22:10 ` [PATCH v3 53/53] object: convert parse_object* to take " brian m. carlson
2017-05-08 21:53 ` [PATCH v3 00/53] object_id part 8 Jonathan Tan
2017-05-09 22:13 ` Brandon Williams
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
List information: http://vger.kernel.org/majordomo-info.html
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20170506221038.296722-36-sandals@crustytoothpaste.net \
--to=sandals@crustytoothpaste.net \
--cc=bmwill@google.com \
--cc=git@vger.kernel.org \
--cc=jonathantanmy@google.com \
--cc=mhagger@alum.mit.edu \
--cc=pclouds@gmail.com \
--cc=peff@peff.net \
--cc=sbeller@google.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
Code repositories for project(s) associated with this public inbox
https://80x24.org/mirrors/git.git
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for read-only IMAP folder(s) and NNTP newsgroup(s).