[PATCH v3 4/4] merge: --no-verify to bypass pre-merge-commit hook

[Josh Steadmon <steadmon@google.com>]

Analogous to commit, introduce a '--no-verify' option which bypasses the
pre-merge-commit hook. The shorthand '-n' is taken by '--no-stat'
already.

[js: * reworded commit message to reflect current state of --no-stat flag
       and new hook name
     * fixed flag documentation to reflect new hook name
     * cleaned up trailing whitespace
     * squashed test changes from the original series' patch 4/4
     * modified tests to follow pattern from this series' patch 1/4
]

Signed-off-by: Michael J Gruber <git@grubix.eu>
Signed-off-by: Josh Steadmon <steadmon@google.com>
---
 Documentation/githooks.txt                    |  2 +-
 builtin/merge.c                               |  4 +--
 ...3-pre-commit-and-pre-merge-commit-hooks.sh | 29 +++++++++++++++++++
 3 files changed, 32 insertions(+), 3 deletions(-)

diff --git a/Documentation/githooks.txt b/Documentation/githooks.txt
index 7c4c994858..a934553509 100644
--- a/Documentation/githooks.txt
+++ b/Documentation/githooks.txt
@@ -108,7 +108,7 @@ pre-merge-commit
 
 This hook is invoked by 'git merge' when doing an automatic merge
 commit; it is equivalent to 'pre-commit' for a non-automatic commit
-for a merge.
+for a merge, and can be bypassed with the `--no-verify` option.
 
 prepare-commit-msg
 ~~~~~~~~~~~~~~~~~~
diff --git a/builtin/merge.c b/builtin/merge.c
index bf0ae68c40..c9746e37b8 100644
--- a/builtin/merge.c
+++ b/builtin/merge.c
@@ -287,7 +287,7 @@ static struct option builtin_merge_options[] = {
 	  N_("GPG sign commit"), PARSE_OPT_OPTARG, NULL, (intptr_t) "" },
 	OPT_BOOL(0, "overwrite-ignore", &overwrite_ignore, N_("update ignored files (default)")),
 	OPT_BOOL(0, "signoff", &signoff, N_("add Signed-off-by:")),
-	OPT_BOOL(0, "no-verify", &no_verify, N_("bypass commit-msg hook")),
+	OPT_BOOL(0, "no-verify", &no_verify, N_("bypass pre-merge-commit and commit-msg hooks")),
 	OPT_END()
 };
 
@@ -818,7 +818,7 @@ static void prepare_to_commit(struct commit_list *remoteheads)
 	struct strbuf msg = STRBUF_INIT;
 	const char *index_file = get_index_file();
 
-	if (run_commit_hook(0 < option_edit, index_file, "pre-merge-commit", NULL))
+	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,
diff --git a/t/t7503-pre-commit-and-pre-merge-commit-hooks.sh b/t/t7503-pre-commit-and-pre-merge-commit-hooks.sh
index 040dfa0175..86a375ab3e 100755
--- a/t/t7503-pre-commit-and-pre-merge-commit-hooks.sh
+++ b/t/t7503-pre-commit-and-pre-merge-commit-hooks.sh
@@ -68,6 +68,15 @@ test_expect_success '--no-verify with no hook' '
 	test_cmp expected_hooks actual_hooks
 '
 
+test_expect_success '--no-verify with no hook (merge)' '
+	test_when_finished "rm -f expected_hooks actual_hooks" &&
+	touch expected_hooks actual_hooks &&
+	git checkout side &&
+	git merge --no-verify -m "merge master" master &&
+	git checkout master &&
+	test_cmp expected_hooks actual_hooks
+'
+
 test_expect_success 'with succeeding hook' '
 	test_when_finished "rm -f \"$PRECOMMIT\" expected_hooks actual_hooks" &&
 	ln -s "success.sample" "$PRECOMMIT" &&
@@ -100,6 +109,16 @@ test_expect_success '--no-verify with succeeding hook' '
 	test_cmp expected_hooks actual_hooks
 '
 
+test_expect_success '--no-verify with succeeding hook (merge)' '
+	test_when_finished "rm -f \"$PREMERGE\" expected_hooks actual_hooks" &&
+	ln -s "success.sample" "$PREMERGE" &&
+	touch expected_hooks actual_hooks &&
+	git checkout side &&
+	git merge --no-verify -m "merge master" master &&
+	git checkout master &&
+	test_cmp expected_hooks actual_hooks
+'
+
 test_expect_success 'with failing hook' '
 	test_when_finished "rm -f \"$PRECOMMIT\" expected_hooks actual_hooks" &&
 	ln -s "fail.sample" "$PRECOMMIT" &&
@@ -132,6 +151,16 @@ test_expect_success 'with failing hook (merge)' '
 	test_cmp expected_hooks actual_hooks
 '
 
+test_expect_success '--no-verify with failing hook (merge)' '
+	test_when_finished "rm -f \"$PREMERGE\" expected_hooks actual_hooks" &&
+	ln -s "fail.sample" "$PREMERGE" &&
+	touch expected_hooks actual_hooks &&
+	git checkout side &&
+	git merge --no-verify -m "merge master" master &&
+	git checkout master &&
+	test_cmp expected_hooks actual_hooks
+'
+
 test_expect_success POSIXPERM 'with non-executable hook' '
 	test_when_finished "rm -f \"$PRECOMMIT\" expected_hooks actual_hooks; chmod +x \"$HOOKDIR/fail.sample\"" &&
 	ln -s "fail.sample" "$PRECOMMIT" &&
-- 
2.22.0.770.g0f2c4a37fd-goog