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merge: don't run post-hook logic on --no-verify

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Fix a minor bug introduced in bc40ce4de6 (merge: --no-verify to
bypass pre-merge-commit hook, 2019-08-07), when that change made the
--no-verify option bypass the "pre-merge-commit" hook it didn't update
the corresponding find_hook() (later hook_exists()) condition.

As can be seen in the preceding commit in 6098817fd7 (git-merge:
honor pre-merge-commit hook, 2019-08-07) the two should go hand in
hand. There's no point in invoking discard_cache() here if the hook
couldn't have possibly updated the index.

It's buggy that we use "hook_exist()" here, and as discussed in the
subsequent commit it's subject to obscure race conditions that we're
about to fix, but for now this change is a strict improvement that
retains any caveats to do with the use of "hooks_exist()" as-is.

Signed-off-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Ævar Arnfjörð Bjarmason 2022-03-07 13:33:45 +01:00 committed by Junio C Hamano
parent c2162907e9
commit 9f6e63b966
1 changed files with 12 additions and 9 deletions
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21
builtin/merge.c
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@ -845,15 +845,18 @@ static void prepare_to_commit(struct commit_list *remoteheads)
struct strbuf msg = STRBUF_INIT;
const char *index_file = get_index_file();
if (!no_verify && run_commit_hook(0 < option_edit, index_file, "pre-merge-commit", NULL))
abort_commit(remoteheads, NULL);
/*
* Re-read the index as pre-merge-commit hook could have updated it,
* and write it out as a tree. We must do this before we invoke
* the editor and after we invoke run_status above.
*/
if (hook_exists("pre-merge-commit"))
discard_cache();
if (!no_verify) {
if (run_commit_hook(0 < option_edit, index_file,
"pre-merge-commit", NULL))
abort_commit(remoteheads, NULL);
/*
* Re-read the index as pre-merge-commit hook could have updated it,
* and write it out as a tree. We must do this before we invoke
* the editor and after we invoke run_status above.
*/
if (hook_exists("pre-merge-commit"))
discard_cache();
}
read_cache_from(index_file);
strbuf_addbuf(&msg, &merge_msg);
if (squash)