Git/Packet.pm: extract parts of t0021/rot13-filter.pl for reuse

diff --git a/t/t5531-deep-submodule-push.sh b/t/t5531-deep-submodule-push.sh
index 0f84a53146f3bac1bded4d2b11212b8ddef1bf2c..39cb2c1c3489c25545ab3cd69706c0a21378c6b7 100755 (executable)
--- a/t/t5531-deep-submodule-push.sh
+++ b/t/t5531-deep-submodule-push.sh
@@ -298,6 +298,16 @@ test_expect_success 'push succeeds if submodule commit disabling recursion from
        )
 '
 
+test_expect_success 'submodule entry pointing at a tag is error' '
+       git -C work/gar/bage tag -a test1 -m "tag" &&
+       tag=$(git -C work/gar/bage rev-parse test1^{tag}) &&
+       git -C work update-index --cacheinfo 160000 "$tag" gar/bage &&
+       git -C work commit -m "bad commit" &&
+       test_when_finished "git -C work reset --hard HEAD^" &&
+       test_must_fail git -C work push --recurse-submodules=on-demand ../pub.git master 2>err &&
+       test_i18ngrep "is a tag, not a commit" err
+'
+
 test_expect_success 'push fails if recurse submodules option passed as yes' '
        (
                cd work/gar/bage &&