When gc --auto is called in the presence of worktrees, it fails to take *all* reflogs into account when trying to retain reachable objects, and as a consequence data integrity goes pretty much to hell.
This patch provides a test case in the hopes that this bug gets fixed, after an initial attempt has stalled for eight months already. Signed-off-by: Johannes Schindelin <[email protected]> --- t/t6500-gc.sh | 39 +++++++++++++++++++++++++++++++++++++++ 1 file changed, 39 insertions(+) diff --git a/t/t6500-gc.sh b/t/t6500-gc.sh index 1762dfa6a3..e24a4fb611 100755 --- a/t/t6500-gc.sh +++ b/t/t6500-gc.sh @@ -67,5 +67,44 @@ test_expect_success 'auto gc with too many loose objects does not attempt to cre test_line_count = 2 new # There is one new pack and its .idx ' +trigger_auto_gc () { + # This is unfortunately very, very ugly + gdir="$(git rev-parse --git-common-dir)" && + mkdir -p "$gdir"/objects/17 && + touch "$gdir"/objects/17/17171717171717171717171717171717171717 && + touch "$gdir"/objects/17/17171717171717171717171717171717171718 && + git -c gc.auto=1 -c gc.pruneexpire=now -c gc.autodetach=0 gc --auto +} + +test_expect_failure 'gc respects refs/reflogs in all worktrees' ' + test_commit something && + git worktree add worktree && + ( + cd worktree && + git checkout --detach && + # avoid implicit tagging of test_commit + echo 1 >something.t && + test_tick && + git commit -m worktree-reflog something.t && + git rev-parse --verify HEAD >../commit-reflog && + echo 2 >something.t && + test_tick && + git commit -m worktree-ref something.t && + git rev-parse --verify HEAD >../commit-ref + ) && + trigger_auto_gc && + git rev-parse --verify $(cat commit-ref)^{commit} && + git rev-parse --verify $(cat commit-reflog)^{commit} && + + # Now, add a reflog in the top-level dir and verify that `git gc` in + # the worktree does not purge that + git checkout --detach && + echo 3 >something.t && + test_tick && + git commit -m commondir-reflog something.t && + git rev-parse --verify HEAD >commondir-reflog && + (cd worktree && trigger_auto_gc) && + git rev-parse --verify $(cat commondir-reflog)^{commit} +' test_done -- 2.11.1.windows.1
