Add option to git-commit to allow empty log messages

Change git-commit(1) to accept the --allow-empty-message option
to allow a commit with an empty message.  This is analogous to the
existing --allow-empty option which allows a commit that records
no changes.  As these are mainly for interoperating with foreign SCM
systems, and are not meant for normal use, ensure that "git commit -h"
does not talk about them.

Signed-off-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

1 files changed, 22 insertions, 0 deletions

diff --git a/t/t7500-commit.sh b/t/t7500-commit.sh
index 9f5c3ed..aa9c577 100755
--- a/t/t7500-commit.sh
+++ b/t/t7500-commit.sh
@@ -193,4 +193,26 @@ test_expect_success 'commit -F overrides -t' '
 	commit_msg_is "-F log"
 '
 
+test_expect_success 'Commit without message is allowed with --allow-empty-message' '
+	echo "more content" >>foo &&
+	git add foo &&
+	>empty &&
+	git commit --allow-empty-message <empty &&
+	commit_msg_is ""
+'
+
+test_expect_success 'Commit without message is no-no without --allow-empty-message' '
+	echo "more content" >>foo &&
+	git add foo &&
+	>empty &&
+	test_must_fail git commit <empty
+'
+
+test_expect_success 'Commit a message with --allow-empty-message' '
+	echo "even more content" >>foo &&
+	git add foo &&
+	git commit --allow-empty-message -m"hello there" &&
+	commit_msg_is "hello there"
+'
+
 test_done