The try_merge_strategy() function always ran the strategy in a separate
process, though this is not always necessary. The recursive and subtree
strategy can be called without a fork(). This patch adds a check, and
calls recursive in the same process without wasting resources.
Signed-off-by: Johannes Schindelin <johannes.schindelin@xxxxxx>
Signed-off-by: Miklos Vajna <vmiklos@xxxxxxxxxxxxxx>
---
On Sat, Aug 23, 2008 at 06:58:37PM -0700, Junio C Hamano <gitster@xxxxxxxxx> wrote:
> By the way, in the medium term, if we are serious about making an
> internal call to merge_recursive() from cmd_merge(), I think we may be
> better off making it the responsibility for try_merge_strategy() to
> leave an committable state in the in-core index (aka "the_index") when
> they return with 0 (success) status. After calling external ones via
> the run_command interface, it should do a read_cache() (after calling
> discard_cache() if needed); if it calls merge_recursive(), hopefully
> you already have the committable state in the in-core index.
>
> That way, when automerge succeeds, write_tree_trivial() can write that
> in-core index out and create the tree object to be committed. The
> callchain to use merge_recursive() can avoid having to write to the
> on-disk index, read it again and write out the tree from it.
This is mostly the same patch I submitted earlier, but this is now on
top of mv/merge-recursive, and now it does what you suggested above.
builtin-merge.c | 92 +++++++++++++++++++++++++++++++++++++-----------------
1 files changed, 63 insertions(+), 29 deletions(-)
diff --git a/builtin-merge.c b/builtin-merge.c
index 0bff26e..3a38089 100644
--- a/builtin-merge.c
+++ b/builtin-merge.c
@@ -22,6 +22,7 @@
#include "log-tree.h"
#include "color.h"
#include "rerere.h"
+#include "merge-recursive.h"
#define DEFAULT_TWOHEAD (1<<0)
#define DEFAULT_OCTOPUS (1<<1)
@@ -511,28 +512,64 @@ static int try_merge_strategy(const char *strategy, struct commit_list *common,
struct commit_list *j;
struct strbuf buf;
- args = xmalloc((4 + commit_list_count(common) +
- commit_list_count(remoteheads)) * sizeof(char *));
- strbuf_init(&buf, 0);
- strbuf_addf(&buf, "merge-%s", strategy);
- args[i++] = buf.buf;
- for (j = common; j; j = j->next)
- args[i++] = xstrdup(sha1_to_hex(j->item->object.sha1));
- args[i++] = "--";
- args[i++] = head_arg;
- for (j = remoteheads; j; j = j->next)
- args[i++] = xstrdup(sha1_to_hex(j->item->object.sha1));
- args[i] = NULL;
- ret = run_command_v_opt(args, RUN_GIT_CMD);
- strbuf_release(&buf);
- i = 1;
- for (j = common; j; j = j->next)
- free((void *)args[i++]);
- i += 2;
- for (j = remoteheads; j; j = j->next)
- free((void *)args[i++]);
- free(args);
- return -ret;
+ if (!strcmp(strategy, "recursive") || !strcmp(strategy, "subtree")) {
+ int clean;
+ struct commit *result;
+ struct lock_file *lock = xcalloc(1, sizeof(struct lock_file));
+ int index_fd;
+ struct commit_list *reversed = NULL;
+ struct merge_options o;
+
+ if (remoteheads->next) {
+ error("Not handling anything other than two heads merge.");
+ return 2;
+ }
+
+ init_merge_options(&o);
+ if (!strcmp(strategy, "subtree"))
+ o.subtree_merge = 1;
+
+ o.branch1 = head_arg;
+ o.branch2 = remoteheads->item->util;
+
+ for (j = common; j; j = j->next)
+ commit_list_insert(j->item, &reversed);
+
+ index_fd = hold_locked_index(lock, 1);
+ clean = merge_recursive(&o, lookup_commit(head),
+ remoteheads->item, reversed, &result);
+ if (active_cache_changed &&
+ (write_cache(index_fd, active_cache, active_nr) ||
+ commit_locked_index(lock)))
+ die ("unable to write %s", get_index_file());
+ return clean ? 0 : 1;
+ } else {
+ args = xmalloc((4 + commit_list_count(common) +
+ commit_list_count(remoteheads)) * sizeof(char *));
+ strbuf_init(&buf, 0);
+ strbuf_addf(&buf, "merge-%s", strategy);
+ args[i++] = buf.buf;
+ for (j = common; j; j = j->next)
+ args[i++] = xstrdup(sha1_to_hex(j->item->object.sha1));
+ args[i++] = "--";
+ args[i++] = head_arg;
+ for (j = remoteheads; j; j = j->next)
+ args[i++] = xstrdup(sha1_to_hex(j->item->object.sha1));
+ args[i] = NULL;
+ ret = run_command_v_opt(args, RUN_GIT_CMD);
+ strbuf_release(&buf);
+ i = 1;
+ for (j = common; j; j = j->next)
+ free((void *)args[i++]);
+ i += 2;
+ for (j = remoteheads; j; j = j->next)
+ free((void *)args[i++]);
+ free(args);
+ discard_cache();
+ if (read_cache() < 0)
+ die("failed to read the cache");
+ return -ret;
+ }
}
static void count_diff_files(struct diff_queue_struct *q,
@@ -743,10 +780,6 @@ static int evaluate_result(void)
int cnt = 0;
struct rev_info rev;
- discard_cache();
- if (read_cache() < 0)
- die("failed to read the cache");
-
/* Check how many files differ. */
init_revisions(&rev, "");
setup_revisions(0, NULL, &rev, NULL);
@@ -880,12 +913,14 @@ int cmd_merge(int argc, const char **argv, const char *prefix)
for (i = 0; i < argc; i++) {
struct object *o;
+ struct commit *commit;
o = peel_to_type(argv[i], 0, NULL, OBJ_COMMIT);
if (!o)
die("%s - not something we can merge", argv[i]);
- remotes = &commit_list_insert(lookup_commit(o->sha1),
- remotes)->next;
+ commit = lookup_commit(o->sha1);
+ commit->util = (void *)argv[i];
+ remotes = &commit_list_insert(commit, remotes)->next;
strbuf_addf(&buf, "GITHEAD_%s", sha1_to_hex(o->sha1));
setenv(buf.buf, argv[i], 1);
@@ -1079,7 +1114,6 @@ int cmd_merge(int argc, const char **argv, const char *prefix)
}
/* Automerge succeeded. */
- discard_cache();
write_tree_trivial(result_tree);
automerge_was_ok = 1;
break;
--
1.6.0
--
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