stash drops the stash even if creating the branch fails because it already exists

This bug was disovered by someone on IRC when he tried to

    $ git stash branch <branch> <stash>

while <branch> already existed. In that case the stash is dropped even
though it isn't applied on any branch, so the stash is effectively lost.

Signed-off-by: Tomas Carnecky <tom@dbservice.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/t/t3903-stash.sh b/t/t3903-stash.sh
index 9ed2396e29fb6f573f32e12c1dd4182086d60b04..4215cc698613879e22adcc5e68d3f8ee6281940e 100755 (executable)
--- a/t/t3903-stash.sh
+++ b/t/t3903-stash.sh
@@ -545,4 +545,15 @@ test_expect_success 'invalid ref of the form stash@{n}, n >= N' '
        git stash drop
 '
 
+test_expect_failure 'stash branch should not drop the stash if the branch exists' '
+       git stash clear &&
+       echo foo >file &&
+       git add file &&
+       git commit -m initial &&
+       echo bar >file &&
+       git stash &&
+       test_must_fail git stash branch master stash@{0} &&
+       git rev-parse stash@{0} --
+'
+
 test_done