Re: Is t5516 somehow flakey only on macOS?

On Sat, Jan 09, 2021 at 02:42:56PM -0800, Junio C Hamano wrote:

Agreed. Here's the same patch with the commit message updated to use "after", plus Eric's typofix.

-- >8 --
Subject: [PATCH] t5516: loosen "not our ref" error check

Commit 014ade7484 (upload-pack: send ERR packet for non-tip objects, 2019-04-13) added a test that greps the output of a failed fetch to make sure that upload-pack sent us the ERR packet we expected. But checking this is racy; despite the argument in that commit, the client may still be sending a "done" line after the server exits, causing it to die() on a failed write() and never see the ERR packet at all.

This fails quite rarely on Linux, but more often on macOS. However, it can be triggered reliably with:

	diff --git a/fetch-pack.c b/fetch-pack.c
	index 876f90c759..cf40de9092 100644
	--- a/fetch-pack.c
	+++ b/fetch-pack.c
	@@ -489,6 +489,7 @@ static int find_common(struct fetch_negotiator *negotiator,
	 done:
	 	trace2_region_leave("fetch-pack", "negotiation_v0_v1", the_repository);
	 	if (!got_ready || !no_done) {
	+		sleep(1);
	 		packet_buf_write(&req_buf, "done\n");
	 		send_request(args, fd[1], &req_buf);
	 	}

This is a real user-visible race that it would be nice to fix, but it's tricky to do so: the client would have to speculatively try to read an ERR packet after hitting a write() error. And at least for this error, it's specific to v0 (since v2 does not enforce reachability at all).

So let's loosen the test to avoid annoying racy failures. If we eventually do the read-after-failed-write thing, we can tighten it. And if not, v0 will grow increasingly obsolete as servers support v2, so the utility of this test will decrease over time anyway.

Note that we can still check stderr to make sure upload-pack bailed for the reason we expected. It writes a similar message to stderr, and because the server side is just another process connected by pipes, we'll reliably see it. This would not be the case for git://, or for ssh servers that do not relay stderr (e.g., GitHub's custom endpoint does not).

Helped-by: SZEDER Gábor <szeder.dev@gmail.com>
Signed-off-by: Jeff King <peff@peff.net>
---
 t/t5516-fetch-push.sh | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)