From: Trieu Huynh Date: Thu, 02 Apr 2026 19:13:58 GMT Subject: [GSoC PATCH v2] backfill: error out when HEAD cannot be parsed Message-ID: <20260402191359.11304-1-viking4@gmail.com> From: Trieu Huynh handle_revision_arg() returns non-zero on failure, but do_backfill() ignores the return value. On an empty repo with no commits, HEAD is unborn and handle_revision_arg() fails, but backfill silently continues with an empty revision walk and exists with a zero return code. Check the return value and propagate the error, consistent with how builtin/pack-objects.c handles handle_revision_arg() failures. Add a test to verify that backfill on an empty repository fails with a clear error message. Signed-off-by: Trieu Huynh --- Changes in v2: - Update commit msg (Point out by Karthik Nayak ) - Use test_grep instead of grep (Point out by Tian Yuchen ) builtin/backfill.c | 3 ++- t/t5620-backfill.sh | 6 ++++++ 2 files changed, 8 insertions(+), 1 deletion(-) diff --git a/builtin/backfill.c b/builtin/backfill.c index e9a33e81be..ca49e188df 100644 --- a/builtin/backfill.c +++ b/builtin/backfill.c @@ -92,7 +92,8 @@ static int do_backfill(struct backfill_context *ctx) } repo_init_revisions(ctx->repo, &revs, ""); - handle_revision_arg("HEAD", &revs, 0, 0); + if (handle_revision_arg("HEAD", &revs, 0, 0)) + return error(_("unable to parse HEAD revision")); info.blobs = 1; info.tags = info.commits = info.trees = 0; diff --git a/t/t5620-backfill.sh b/t/t5620-backfill.sh index 58c81556e7..066ee17d39 100755 --- a/t/t5620-backfill.sh +++ b/t/t5620-backfill.sh @@ -77,6 +77,12 @@ test_expect_success 'do partial clone 2, backfill min batch size' ' test_line_count = 0 revs2 ' +test_expect_success 'backfill on empty repo fails gracefully' ' + git init empty-repo && + test_must_fail git -C empty-repo backfill 2>err && + test_grep "unable to parse HEAD" err +' + test_expect_success 'backfill --sparse without sparse-checkout fails' ' git init not-sparse && test_must_fail git -C not-sparse backfill --sparse 2>err && -- 2.43.0