prune: lazily perform reachability traversal

diff --git a/t/t5304-prune.sh b/t/t5304-prune.sh
index 270da21ac3e2931a42683392536500c4bb1fb5c3..2c19a790c1be2eac2ba13903933c2b96692d620c 100755 (executable)
--- a/t/t5304-prune.sh
+++ b/t/t5304-prune.sh
@@ -274,6 +274,18 @@ test_expect_success 'prune .git/shallow' '
        test_path_is_missing .git/shallow
 '
 
+test_expect_success 'prune .git/shallow when there are no loose objects' '
+       SHA1=$(echo hi|git commit-tree HEAD^{tree}) &&
+       echo $SHA1 >.git/shallow &&
+       git update-ref refs/heads/shallow-tip $SHA1 &&
+       git repack -ad &&
+       # verify assumption that all loose objects are gone
+       git count-objects | grep ^0 &&
+       git prune &&
+       echo $SHA1 >expect &&
+       test_cmp expect .git/shallow
+'
+
 test_expect_success 'prune: handle alternate object database' '
        test_create_repo A &&
        git -C A commit --allow-empty -m "initial commit" &&