[PATCH v3 03/17] merge: use config-based hooks for post-merge hook

[Emily Shaffer <emilyshaffer@google.com>]

Teach post-merge to use the hook.h library instead of the run-command.h
library to run hooks. This means that post-merge hooks can come from the
config as well as from the hookdir. post-merge is invoked only from
builtin/merge.c.

Signed-off-by: Emily Shaffer <emilyshaffer@google.com>
---
 Documentation/githooks.txt | 2 ++
 builtin/merge.c            | 5 ++++-
 2 files changed, 6 insertions(+), 1 deletion(-)

diff --git a/Documentation/githooks.txt b/Documentation/githooks.txt
index 0842cd812c..f6ddf1aa22 100644
--- a/Documentation/githooks.txt
+++ b/Documentation/githooks.txt
@@ -236,6 +236,8 @@ save and restore any form of metadata associated with the working tree
 (e.g.: permissions/ownership, ACLS, etc).  See contrib/hooks/setgitperms.perl
 for an example of how to do this.
 
+Hooks executed during 'post-merge' will run in parallel by default.
+
 pre-push
 ~~~~~~~~
 
diff --git a/builtin/merge.c b/builtin/merge.c
index d654b6923c..717fbaa019 100644
--- a/builtin/merge.c
+++ b/builtin/merge.c
@@ -443,6 +443,7 @@ static void finish(struct commit *head_commit,
 		   const struct object_id *new_head, const char *msg)
 {
 	struct strbuf reflog_message = STRBUF_INIT;
+	struct run_hooks_opt opt = RUN_HOOKS_OPT_INIT_ASYNC;
 	const struct object_id *head = &head_commit->object.oid;
 
 	if (!msg)
@@ -484,7 +485,9 @@ static void finish(struct commit *head_commit,
 	}
 
 	/* Run a post-merge hook */
-	run_hook_le(NULL, "post-merge", squash ? "1" : "0", NULL);
+	strvec_push(&opt.args, squash ? "1" : "0");
+	run_hooks("post-merge", &opt);
+	run_hooks_opt_clear(&opt);
 
 	apply_autostash(git_path_merge_autostash(the_repository));
 	strbuf_release(&reflog_message);
-- 
2.28.0.rc0.142.g3c755180ce-goog