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From: Alban Gruin <alban.gruin@gmail.com>
To: git@vger.kernel.org
Cc: Junio C Hamano <gitster@pobox.com>, Alban Gruin <alban.gruin@gmail.com>
Subject: [RFC PATCH v1 06/17] merge-index: libify merge_one_path() and merge_all()
Date: Thu, 25 Jun 2020 14:19:42 +0200	[thread overview]
Message-ID: <20200625121953.16991-7-alban.gruin@gmail.com> (raw)
In-Reply-To: <20200625121953.16991-1-alban.gruin@gmail.com>

The "resolve" and "octopus" merge strategies do not call directly `git
merge-one-file', they delegate the work to another git command, `git
merge-index', that will loop over files in the index and call the
specified command.  Unfortunately, these functions are not part of
libgit.a, which means that once rewritten, the strategies would still
have to invoke `merge-one-file' by spawning a new process first.

To avoid this, this moves merge_one_path(), merge_all(), and their
helpers to merge-strategies.c.  They also take a callback to dictate
what they should do for each file.  For now, only one launching a new
process is defined to preserve the behaviour of the builtin version.

Signed-off-by: Alban Gruin <alban.gruin@gmail.com>
---

Notes:
    This patch is best viewed with `--color-moved'.

 builtin/merge-index.c | 77 +++------------------------------
 merge-strategies.c    | 99 +++++++++++++++++++++++++++++++++++++++++++
 merge-strategies.h    | 17 ++++++++
 3 files changed, 123 insertions(+), 70 deletions(-)

diff --git a/builtin/merge-index.c b/builtin/merge-index.c
index 38ea6ad6ca..6cb666cc78 100644
--- a/builtin/merge-index.c
+++ b/builtin/merge-index.c
@@ -1,74 +1,11 @@
 #define USE_THE_INDEX_COMPATIBILITY_MACROS
 #include "builtin.h"
-#include "run-command.h"
-
-static const char *pgm;
-static int one_shot, quiet;
-static int err;
-
-static int merge_entry(int pos, const char *path)
-{
-	int found;
-	const char *arguments[] = { pgm, "", "", "", path, "", "", "", NULL };
-	char hexbuf[4][GIT_MAX_HEXSZ + 1];
-	char ownbuf[4][60];
-
-	if (pos >= active_nr)
-		die("git merge-index: %s not in the cache", path);
-	found = 0;
-	do {
-		const struct cache_entry *ce = active_cache[pos];
-		int stage = ce_stage(ce);
-
-		if (strcmp(ce->name, path))
-			break;
-		found++;
-		oid_to_hex_r(hexbuf[stage], &ce->oid);
-		xsnprintf(ownbuf[stage], sizeof(ownbuf[stage]), "%o", ce->ce_mode);
-		arguments[stage] = hexbuf[stage];
-		arguments[stage + 4] = ownbuf[stage];
-	} while (++pos < active_nr);
-	if (!found)
-		die("git merge-index: %s not in the cache", path);
-
-	if (run_command_v_opt(arguments, 0)) {
-		if (one_shot)
-			err++;
-		else {
-			if (!quiet)
-				die("merge program failed");
-			exit(1);
-		}
-	}
-	return found;
-}
-
-static void merge_one_path(const char *path)
-{
-	int pos = cache_name_pos(path, strlen(path));
-
-	/*
-	 * If it already exists in the cache as stage0, it's
-	 * already merged and there is nothing to do.
-	 */
-	if (pos < 0)
-		merge_entry(-pos-1, path);
-}
-
-static void merge_all(void)
-{
-	int i;
-	for (i = 0; i < active_nr; i++) {
-		const struct cache_entry *ce = active_cache[i];
-		if (!ce_stage(ce))
-			continue;
-		i += merge_entry(i, ce->name)-1;
-	}
-}
+#include "merge-strategies.h"
 
 int cmd_merge_index(int argc, const char **argv, const char *prefix)
 {
-	int i, force_file = 0;
+	int i, force_file = 0, err = 0, one_shot = 0, quiet = 0;
+	const char *pgm;
 
 	/* Without this we cannot rely on waitpid() to tell
 	 * what happened to our children.
@@ -98,14 +35,14 @@ int cmd_merge_index(int argc, const char **argv, const char *prefix)
 				continue;
 			}
 			if (!strcmp(arg, "-a")) {
-				merge_all();
+				err |= merge_all(&the_index, one_shot, quiet,
+						 merge_program_cb, (void *)pgm);
 				continue;
 			}
 			die("git merge-index: unknown option %s", arg);
 		}
-		merge_one_path(arg);
+		err |= merge_one_path(&the_index, one_shot, quiet, arg,
+				      merge_program_cb, (void *)pgm);
 	}
-	if (err && !quiet)
-		die("merge program failed");
 	return err;
 }
diff --git a/merge-strategies.c b/merge-strategies.c
index 3a9fce9f22..f4c0b4acd6 100644
--- a/merge-strategies.c
+++ b/merge-strategies.c
@@ -1,6 +1,7 @@
 #include "cache.h"
 #include "dir.h"
 #include "merge-strategies.h"
+#include "run-command.h"
 #include "xdiff-interface.h"
 
 static int add_to_index_cacheinfo(struct index_state *istate,
@@ -189,3 +190,101 @@ int merge_strategies_one_file(struct repository *r,
 
 	return 0;
 }
+
+int merge_program_cb(const struct object_id *orig_blob,
+		     const struct object_id *our_blob,
+		     const struct object_id *their_blob, const char *path,
+		     unsigned int orig_mode, unsigned int our_mode, unsigned int their_mode,
+		     void *data)
+{
+	char ownbuf[3][60] = {{0}};
+	const char *arguments[] = { (char *)data, "", "", "", path,
+				    ownbuf[0], ownbuf[1], ownbuf[2],
+				    NULL };
+
+	if (orig_blob)
+		arguments[1] = oid_to_hex(orig_blob);
+	if (our_blob)
+		arguments[2] = oid_to_hex(our_blob);
+	if (their_blob)
+		arguments[3] = oid_to_hex(their_blob);
+
+	xsnprintf(ownbuf[0], sizeof(ownbuf[0]), "%o", orig_mode);
+	xsnprintf(ownbuf[1], sizeof(ownbuf[1]), "%o", our_mode);
+	xsnprintf(ownbuf[2], sizeof(ownbuf[2]), "%o", their_mode);
+
+	return run_command_v_opt(arguments, 0);
+}
+
+static int merge_entry(struct index_state *istate, int quiet, int pos,
+		       const char *path, merge_cb cb, void *data)
+{
+	int found = 0;
+	const struct object_id *oids[3] = {NULL};
+	unsigned int modes[3] = {0};
+
+	do {
+		const struct cache_entry *ce = istate->cache[pos];
+		int stage = ce_stage(ce);
+
+		if (strcmp(ce->name, path))
+			break;
+		found++;
+		oids[stage - 1] = &ce->oid;
+		modes[stage - 1] = ce->ce_mode;
+	} while (++pos < istate->cache_nr);
+	if (!found)
+		return error(_("%s is not in the cache"), path);
+
+	if (cb(oids[0], oids[1], oids[2], path, modes[0], modes[1], modes[2], data)) {
+		if (!quiet)
+			error(_("Merge program failed"));
+		return -2;
+	}
+
+	return found;
+}
+
+int merge_one_path(struct index_state *istate, int oneshot, int quiet,
+		   const char *path, merge_cb cb, void *data)
+{
+	int pos = index_name_pos(istate, path, strlen(path)), ret;
+
+	/*
+	 * If it already exists in the cache as stage0, it's
+	 * already merged and there is nothing to do.
+	 */
+	if (pos < 0) {
+		ret = merge_entry(istate, quiet, -pos - 1, path, cb, data);
+		if (ret == -1)
+			return -1;
+		else if (ret == -2)
+			return 1;
+	}
+	return 0;
+}
+
+int merge_all(struct index_state *istate, int oneshot, int quiet,
+	      merge_cb cb, void *data)
+{
+	int err = 0, i, ret;
+	for (i = 0; i < istate->cache_nr; i++) {
+		const struct cache_entry *ce = istate->cache[i];
+		if (!ce_stage(ce))
+			continue;
+
+		ret = merge_entry(istate, quiet, i, ce->name, cb, data);
+		if (ret > 0)
+			i += ret - 1;
+		else if (ret == -1)
+			return -1;
+		else if (ret == -2) {
+			if (oneshot)
+				err++;
+			else
+				return 1;
+		}
+	}
+
+	return err;
+}
diff --git a/merge-strategies.h b/merge-strategies.h
index b527d145c7..cf78d7eaf4 100644
--- a/merge-strategies.h
+++ b/merge-strategies.h
@@ -10,4 +10,21 @@ int merge_strategies_one_file(struct repository *r,
 			      unsigned int orig_mode, unsigned int our_mode,
 			      unsigned int their_mode);
 
+typedef int (*merge_cb)(const struct object_id *orig_blob,
+			const struct object_id *our_blob,
+			const struct object_id *their_blob, const char *path,
+			unsigned int orig_mode, unsigned int our_mode, unsigned int their_mode,
+			void *data);
+
+int merge_program_cb(const struct object_id *orig_blob,
+		     const struct object_id *our_blob,
+		     const struct object_id *their_blob, const char *path,
+		     unsigned int orig_mode, unsigned int our_mode, unsigned int their_mode,
+		     void *data);
+
+int merge_one_path(struct index_state *istate, int oneshot, int quiet,
+		   const char *path, merge_cb cb, void *data);
+int merge_all(struct index_state *istate, int oneshot, int quiet,
+	      merge_cb cb, void *data);
+
 #endif /* MERGE_STRATEGIES_H */
-- 
2.27.0.139.gc9c318d6bf


  parent reply	other threads:[~2020-06-25 12:49 UTC|newest]

Thread overview: 156+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-06-25 12:19 [RFC PATCH v1 00/17] Rewrite the remaining merge strategies from shell to C Alban Gruin
2020-06-25 12:19 ` [RFC PATCH v1 01/17] t6027: modernise tests Alban Gruin
2020-06-25 12:19 ` [RFC PATCH v1 02/17] merge-one-file: rewrite in C Alban Gruin
2020-06-25 14:55   ` Chris Torek
2020-06-25 15:16   ` Phillip Wood
2020-06-25 18:17     ` Phillip Wood
2020-06-26 14:33       ` Phillip Wood
2020-07-12 11:22     ` Alban Gruin
2020-06-25 12:19 ` [RFC PATCH v1 03/17] merge-one-file: remove calls to external processes Alban Gruin
2020-06-25 12:19 ` [RFC PATCH v1 04/17] merge-one-file: use error() instead of fprintf(stderr, ...) Alban Gruin
2020-06-25 12:19 ` [RFC PATCH v1 05/17] merge-one-file: libify merge_one_file() Alban Gruin
2020-06-25 12:19 ` Alban Gruin [this message]
2020-06-26 10:13   ` [RFC PATCH v1 06/17] merge-index: libify merge_one_path() and merge_all() Phillip Wood
2020-06-26 14:32     ` Phillip Wood
2020-07-12 11:36     ` Alban Gruin
2020-07-12 18:02       ` Phillip Wood
2020-07-12 20:10         ` Alban Gruin
2020-06-25 12:19 ` [RFC PATCH v1 07/17] merge-resolve: rewrite in C Alban Gruin
2020-06-25 12:19 ` [RFC PATCH v1 08/17] merge-resolve: remove calls to external processes Alban Gruin
2020-06-25 12:19 ` [RFC PATCH v1 09/17] merge-resolve: libify merge_resolve() Alban Gruin
2020-06-25 12:19 ` [RFC PATCH v1 10/17] merge-recursive: move better_branch_name() to merge.c Alban Gruin
2020-06-25 12:19 ` [RFC PATCH v1 11/17] merge-octopus: rewrite in C Alban Gruin
2020-06-25 12:19 ` [RFC PATCH v1 12/17] merge-octopus: remove calls to external processes Alban Gruin
2020-06-25 12:19 ` [RFC PATCH v1 13/17] merge-octopus: libify merge_octopus() Alban Gruin
2020-06-25 12:19 ` [RFC PATCH v1 14/17] merge: use the "resolve" strategy without forking Alban Gruin
2020-06-25 12:19 ` [RFC PATCH v1 15/17] merge: use the "octopus" " Alban Gruin
2020-06-25 12:19 ` [RFC PATCH v1 16/17] sequencer: use the "resolve" " Alban Gruin
2020-06-25 16:11   ` Phillip Wood
2020-07-12 11:27     ` Alban Gruin
2020-06-25 12:19 ` [RFC PATCH v1 17/17] sequencer: use the "octopus" merge " Alban Gruin
2020-09-01 10:56 ` [PATCH v2 00/11] Rewrite the remaining merge strategies from shell to C Alban Gruin
2020-09-01 10:56   ` [PATCH v2 01/11] t6027: modernise tests Alban Gruin
2020-09-01 10:56   ` [PATCH v2 02/11] merge-one-file: rewrite in C Alban Gruin
2020-09-01 21:06     ` Junio C Hamano
2020-09-02 14:50       ` Alban Gruin
2020-09-01 10:56   ` [PATCH v2 03/11] merge-index: libify merge_one_path() and merge_all() Alban Gruin
2020-09-01 21:11     ` Junio C Hamano
2020-09-02 15:37       ` Alban Gruin
2020-09-01 10:56   ` [PATCH v2 04/11] merge-index: don't fork if the requested program is `git-merge-one-file' Alban Gruin
2020-09-01 10:56   ` [PATCH v2 05/11] merge-resolve: rewrite in C Alban Gruin
2020-09-01 10:57   ` [PATCH v2 06/11] merge-recursive: move better_branch_name() to merge.c Alban Gruin
2020-09-01 10:57   ` [PATCH v2 07/11] merge-octopus: rewrite in C Alban Gruin
2020-09-01 10:57   ` [PATCH v2 08/11] merge: use the "resolve" strategy without forking Alban Gruin
2020-09-01 10:57   ` [PATCH v2 09/11] merge: use the "octopus" " Alban Gruin
2020-09-01 10:57   ` [PATCH v2 10/11] sequencer: use the "resolve" " Alban Gruin
2020-09-01 10:57   ` [PATCH v2 11/11] sequencer: use the "octopus" merge " Alban Gruin
2020-10-05 12:26   ` [PATCH v3 00/11] Rewrite the remaining merge strategies from shell to C Alban Gruin
2020-10-05 12:26     ` [PATCH v3 01/11] t6027: modernise tests Alban Gruin
2020-10-06 20:50       ` Junio C Hamano
2020-10-05 12:26     ` [PATCH v3 02/11] merge-one-file: rewrite in C Alban Gruin
2020-10-06 22:01       ` Junio C Hamano
2020-10-21 19:47         ` Alban Gruin
2020-10-21 20:28           ` Junio C Hamano
2020-10-21 21:20             ` Junio C Hamano
2020-10-21 20:30           ` Junio C Hamano
2020-10-05 12:26     ` [PATCH v3 03/11] merge-index: libify merge_one_path() and merge_all() Alban Gruin
2020-10-09  4:48       ` Junio C Hamano
2020-11-06 19:53         ` Alban Gruin
2020-10-05 12:26     ` [PATCH v3 04/11] merge-index: don't fork if the requested program is `git-merge-one-file' Alban Gruin
2020-10-16 19:07       ` Junio C Hamano
2020-10-05 12:26     ` [PATCH v3 05/11] merge-resolve: rewrite in C Alban Gruin
2020-10-16 19:19       ` Junio C Hamano
2020-11-06 19:53         ` Alban Gruin
2020-10-05 12:26     ` [PATCH v3 06/11] merge-recursive: move better_branch_name() to merge.c Alban Gruin
2020-10-05 12:26     ` [PATCH v3 07/11] merge-octopus: rewrite in C Alban Gruin
2020-10-05 12:26     ` [PATCH v3 08/11] merge: use the "resolve" strategy without forking Alban Gruin
2020-10-05 12:26     ` [PATCH v3 09/11] merge: use the "octopus" " Alban Gruin
2020-10-05 12:26     ` [PATCH v3 10/11] sequencer: use the "resolve" " Alban Gruin
2020-10-05 12:26     ` [PATCH v3 11/11] sequencer: use the "octopus" merge " Alban Gruin
2020-10-07  6:57     ` [PATCH v3 00/11] Rewrite the remaining merge strategies from shell to C Johannes Schindelin
2020-11-13 11:04     ` [PATCH v4 00/12] " Alban Gruin
2020-11-13 11:04       ` [PATCH v4 01/12] t6027: modernise tests Alban Gruin
2020-11-13 11:04       ` [PATCH v4 02/12] update-index: move add_cacheinfo() to read-cache.c Alban Gruin
2020-11-13 11:04       ` [PATCH v4 03/12] merge-one-file: rewrite in C Alban Gruin
2020-11-13 11:04       ` [PATCH v4 04/12] merge-index: libify merge_one_path() and merge_all() Alban Gruin
2020-11-13 11:04       ` [PATCH v4 05/12] merge-index: don't fork if the requested program is `git-merge-one-file' Alban Gruin
2020-11-13 11:04       ` [PATCH v4 06/12] merge-resolve: rewrite in C Alban Gruin
2020-11-13 11:04       ` [PATCH v4 07/12] merge-recursive: move better_branch_name() to merge.c Alban Gruin
2020-11-13 11:04       ` [PATCH v4 08/12] merge-octopus: rewrite in C Alban Gruin
2020-11-13 11:04       ` [PATCH v4 09/12] merge: use the "resolve" strategy without forking Alban Gruin
2020-11-13 11:04       ` [PATCH v4 10/12] merge: use the "octopus" " Alban Gruin
2020-11-13 11:04       ` [PATCH v4 11/12] sequencer: use the "resolve" " Alban Gruin
2020-11-13 11:04       ` [PATCH v4 12/12] sequencer: use the "octopus" merge " Alban Gruin
2020-11-16 10:21       ` [PATCH v5 00/12] Rewrite the remaining merge strategies from shell to C Alban Gruin
2020-11-16 10:21         ` [PATCH v5 01/12] t6027: modernise tests Alban Gruin
2020-11-16 10:21         ` [PATCH v5 02/12] update-index: move add_cacheinfo() to read-cache.c Alban Gruin
2020-11-16 10:21         ` [PATCH v5 03/12] merge-one-file: rewrite in C Alban Gruin
2020-11-16 10:21         ` [PATCH v5 04/12] merge-index: libify merge_one_path() and merge_all() Alban Gruin
2020-11-16 10:21         ` [PATCH v5 05/12] merge-index: don't fork if the requested program is `git-merge-one-file' Alban Gruin
2020-11-16 10:21         ` [PATCH v5 06/12] merge-resolve: rewrite in C Alban Gruin
2020-11-16 10:21         ` [PATCH v5 07/12] merge-recursive: move better_branch_name() to merge.c Alban Gruin
2020-11-16 10:21         ` [PATCH v5 08/12] merge-octopus: rewrite in C Alban Gruin
2020-11-16 10:21         ` [PATCH v5 09/12] merge: use the "resolve" strategy without forking Alban Gruin
2020-11-16 10:21         ` [PATCH v5 10/12] merge: use the "octopus" " Alban Gruin
2020-11-16 10:21         ` [PATCH v5 11/12] sequencer: use the "resolve" " Alban Gruin
2020-11-16 10:21         ` [PATCH v5 12/12] sequencer: use the "octopus" merge " Alban Gruin
2020-11-24 11:53         ` [PATCH v6 00/13] Rewrite the remaining merge strategies from shell to C Alban Gruin
2020-11-24 11:53           ` [PATCH v6 01/13] t6407: modernise tests Alban Gruin
2020-11-24 11:53           ` [PATCH v6 02/13] t6060: modify multiple files to expose a possible issue with merge-index Alban Gruin
2020-11-24 11:53           ` [PATCH v6 03/13] update-index: move add_cacheinfo() to read-cache.c Alban Gruin
2020-12-22 20:54             ` Junio C Hamano
2020-11-24 11:53           ` [PATCH v6 04/13] merge-one-file: rewrite in C Alban Gruin
2020-12-22 21:36             ` Junio C Hamano
2021-01-03 22:41               ` Alban Gruin
2021-01-08  6:54                 ` Junio C Hamano
2020-11-24 11:53           ` [PATCH v6 05/13] merge-index: libify merge_one_path() and merge_all() Alban Gruin
2021-01-05 15:59             ` Derrick Stolee
2021-01-05 23:20               ` Alban Gruin
2020-11-24 11:53           ` [PATCH v6 06/13] merge-index: don't fork if the requested program is `git-merge-one-file' Alban Gruin
2021-01-05 16:11             ` Derrick Stolee
2021-01-05 17:35               ` Martin Ågren
2021-01-05 23:20                 ` Alban Gruin
2021-01-05 23:20               ` Alban Gruin
2021-01-06  2:04                 ` Junio C Hamano
2021-01-10 17:15                   ` Alban Gruin
2021-01-10 20:51                     ` Junio C Hamano
2021-03-08 20:32                       ` Alban Gruin
2020-11-24 11:53           ` [PATCH v6 07/13] merge-resolve: rewrite in C Alban Gruin
2020-11-24 11:53           ` [PATCH v6 08/13] merge-recursive: move better_branch_name() to merge.c Alban Gruin
2021-01-05 16:19             ` Derrick Stolee
2020-11-24 11:53           ` [PATCH v6 09/13] merge-octopus: rewrite in C Alban Gruin
2021-01-05 16:40             ` Derrick Stolee
2020-11-24 11:53           ` [PATCH v6 10/13] merge: use the "resolve" strategy without forking Alban Gruin
2021-01-05 16:45             ` Derrick Stolee
2020-11-24 11:53           ` [PATCH v6 11/13] merge: use the "octopus" " Alban Gruin
2020-11-24 11:53           ` [PATCH v6 12/13] sequencer: use the "resolve" " Alban Gruin
2020-11-24 11:53           ` [PATCH v6 13/13] sequencer: use the "octopus" merge " Alban Gruin
2020-11-24 19:34           ` [PATCH v6 00/13] Rewrite the remaining merge strategies from shell to C SZEDER Gábor
2021-01-05 16:50           ` Derrick Stolee
2021-03-17 20:49           ` [PATCH v7 00/15] " Alban Gruin
2021-03-17 20:49             ` [PATCH v7 01/15] t6407: modernise tests Alban Gruin
2021-03-17 20:49             ` [PATCH v7 02/15] t6060: modify multiple files to expose a possible issue with merge-index Alban Gruin
2021-03-17 20:49             ` [PATCH v7 03/15] t6060: add tests for removed files Alban Gruin
2021-03-22 21:36               ` Johannes Schindelin
2021-03-23 20:43                 ` Alban Gruin
2021-03-17 20:49             ` [PATCH v7 04/15] merge-index: libify merge_one_path() and merge_all() Alban Gruin
2021-03-17 20:49             ` [PATCH v7 05/15] merge-index: drop the index Alban Gruin
2021-03-17 20:49             ` [PATCH v7 06/15] merge-index: add a new way to invoke `git-merge-one-file' Alban Gruin
2021-03-17 20:49             ` [PATCH v7 07/15] update-index: move add_cacheinfo() to read-cache.c Alban Gruin
2021-03-22 21:59               ` Johannes Schindelin
2021-03-23 20:45                 ` Alban Gruin
2021-03-17 20:49             ` [PATCH v7 08/15] merge-one-file: rewrite in C Alban Gruin
2021-03-22 22:20               ` Johannes Schindelin
2021-03-23 20:53                 ` Alban Gruin
2021-03-24  9:10                   ` Johannes Schindelin
2021-04-10 14:17                     ` Alban Gruin
2021-03-17 20:49             ` [PATCH v7 09/15] merge-resolve: " Alban Gruin
2021-03-23 22:21               ` Johannes Schindelin
2021-04-10 14:17                 ` Alban Gruin
2021-03-17 20:49             ` [PATCH v7 10/15] merge-recursive: move better_branch_name() to merge.c Alban Gruin
2021-03-17 20:49             ` [PATCH v7 11/15] merge-octopus: rewrite in C Alban Gruin
2021-03-23 23:58               ` Johannes Schindelin
2021-03-17 20:49             ` [PATCH v7 12/15] merge: use the "resolve" strategy without forking Alban Gruin
2021-03-17 20:49             ` [PATCH v7 13/15] merge: use the "octopus" " Alban Gruin
2021-03-17 20:49             ` [PATCH v7 14/15] sequencer: use the "resolve" " Alban Gruin
2021-03-17 20:49             ` [PATCH v7 15/15] sequencer: use the "octopus" merge " Alban Gruin

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