tree-diff: convert diff_root_tree_sha1() to just call diff_tree_sha1 with old=NULL

diff --git a/t/t5704-bundle.sh b/t/t5704-bundle.sh
index a51c8b0560f85d31dc73d40a58ae3e4c6655f140..a45c31692e17218988e6619742c366043e426039 100755 (executable)
--- a/t/t5704-bundle.sh
+++ b/t/t5704-bundle.sh
@@ -54,8 +54,18 @@ test_expect_success 'ridiculously long subject in boundary' '
        git bundle list-heads long-subject-bundle.bdl >heads &&
        test -s heads &&
        git fetch long-subject-bundle.bdl &&
-       sed -n "/^-/{p;q}" long-subject-bundle.bdl >boundary &&
-       grep "^-$_x40 " boundary
+       sed -n "/^-/{p;q;}" long-subject-bundle.bdl >boundary &&
+       grep "^-[0-9a-f]\\{40\\} " boundary
+'
+
+test_expect_success 'prerequisites with an empty commit message' '
+       : >file1 &&
+       git add file1 &&
+       test_tick &&
+       git commit --allow-empty-message -m "" &&
+       test_commit file2 &&
+       git bundle create bundle HEAD^.. &&
+       git bundle verify bundle
 '
 
 test_done