sequencer: preserve commit messages

sequencer calls "commit" with default options, which implies
"--cleanup=default" unless the user specified something else in their
config. This leads to cherry-picked commits getting a cleaned up commit
message, which is usually not an intended side-effect.

Make the sequencer use "--cleanup=verbatim" so that it preserves commit
messages independent of the default, unless the user has set config for "commit"
or the message is amended with -s or -x.

Reported-by: Christoph Anton Mitterer <calestyo@scientia.net>
Signed-off-by: Michael J Gruber <git@drmicha.warpmail.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

sequencer.c

@@ -358,6 +358,7 @@ static int run_git_commit(const char *defmsg, struct replay_opts *opts,
 	struct argv_array array;
 	int rc;
 	char *gpg_sign;
+	const char *value;
 
 	argv_array_init(&array);
 	argv_array_push(&array, "commit");
@@ -374,6 +375,10 @@ static int run_git_commit(const char *defmsg, struct replay_opts *opts,
 	if (!opts->edit) {
 		argv_array_push(&array, "-F");
 		argv_array_push(&array, defmsg);
+		if (!opts->signoff &&
+		    !opts->record_origin &&
+		    git_config_get_value("commit.cleanup", &value))
+			argv_array_push(&array, "--cleanup=verbatim");
 	}
 
 	if (allow_empty)

t/t3511-cherry-pick-x.sh

@@ -36,6 +36,20 @@ mesg_with_cherry_footer="$mesg_with_footer_sob
 (cherry picked from commit da39a3ee5e6b4b0d3255bfef95601890afd80709)
 Tested-by: C.U. Thor <cuthor@example.com>"
 
+mesg_unclean="$mesg_one_line
+
+
+leading empty lines
+
+
+consecutive empty lines
+
+# hash tag comment
+
+trailing empty lines
+
+
+"
 
 test_expect_success setup '
 	git config advice.detachedhead false &&
@@ -53,6 +67,10 @@ test_expect_success setup '
 	test_commit "$mesg_with_footer_sob" foo b mesg-with-footer-sob &&
 	git reset --hard initial &&
 	test_commit "$mesg_with_cherry_footer" foo b mesg-with-cherry-footer &&
+	git reset --hard initial &&
+	test_config commit.cleanup verbatim &&
+	test_commit "$mesg_unclean" foo b mesg-unclean &&
+	test_unconfig commit.cleanup &&
 	pristine_detach initial &&
 	test_commit conflicting unrelated
 '
@@ -216,4 +234,14 @@ test_expect_success 'cherry-pick -x -s treats "(cherry picked from..." line as p
 	test_cmp expect actual
 '
 
+test_expect_success 'cherry-pick preserves commit message' '
+	pristine_detach initial &&
+	printf "$mesg_unclean" >expect &&
+	git log -1 --pretty=format:%B mesg-unclean >actual &&
+	test_cmp expect actual &&
+	git cherry-pick mesg-unclean &&
+	git log -1 --pretty=format:%B >actual &&
+	test_cmp expect actual
+'
+
 test_done