From: Junio C Hamano <gitster@pobox.com>
To: Jeff King <peff@peff.net>
Cc: git@vger.kernel.org, "Jan Pokorný" <poki@fnusa.cz>,
"Taylor Blau" <me@ttaylorr.com>
Subject: Re: [PATCH v2 4/5] repack: use tempfiles for signal cleanup
Date: Sat, 22 Oct 2022 17:14:33 -0700 [thread overview]
Message-ID: <xmqqtu3vflau.fsf@gitster.g> (raw)
In-Reply-To: <Y1RUI8ny2mexxwKm@coredump.intra.peff.net> (Jeff King's message of "Sat, 22 Oct 2022 16:35:47 -0400")
Jeff King <peff@peff.net> writes:
> Ugh, I think this test is racy. I saw a failure via SIGPIPE on OS X in
> CI, and running it locally with --stress confirmed. I think the problem
> is in our method to trigger pack-objects to fail for the cruft pack. We
> pass a bogus command line argument, so pack-objects exits more or less
> immediately. But the parent git-repack process is trying to write to its
> stdin (to name packs to keep/exclude). So that write may succeed or fail
> based on how quickly the child dies.
Yeah, I saw flaky failures myself during my integration tests.
> Some options:
>
> - find a different way to convince repack to die. The most likely is
> probably corrupting the cruft objects in some way such that
> pack-objects dies, but not until it starts doing real work.
>
> - mark the test_must_fail with ok=sigpipe. In most case this is a
> band-aid, but here we still test what we want. The .tmp cleanup
> should kick in from a die() or from a signal death, so either is
> sufficient for our purposes.
>
> - teach git-repack to ignore sigpipe. We don't actually check the
> writes to pack-objects (since they're done by fprintf), but we'd
> notice its failing exit code. And arguably this is improving the
> user experience. Saying "pack-objects died with an error" is more
> useful than a sigpipe.
>
> Thoughts?
I agree that for this particular one the second one is a reasonable
thing to do in the context of the test. The third one may actually
be a better fix, exactly for the reason you state here.
Thanks.
next prev parent reply other threads:[~2022-10-23 0:18 UTC|newest]
Thread overview: 34+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-10-21 21:41 [PATCH 0/4] repack tempfile-cleanup signal deadlock Jeff King
2022-10-21 21:42 ` [PATCH 1/4] repack: convert "names" util bitfield to array Jeff King
2022-10-21 22:19 ` Junio C Hamano
2022-10-21 23:10 ` Taylor Blau
2022-10-21 23:29 ` Jeff King
2022-10-21 23:35 ` Junio C Hamano
2022-10-21 23:43 ` Jeff King
2022-10-21 23:51 ` Junio C Hamano
2022-10-22 0:12 ` Jeff King
2022-10-21 21:43 ` [PATCH 2/4] repack: populate extension bits incrementally Jeff King
2022-10-21 23:20 ` Taylor Blau
2022-10-21 23:34 ` Jeff King
2022-10-21 23:41 ` Taylor Blau
2022-10-21 23:42 ` Jeff King
2022-10-21 21:46 ` [PATCH 3/4] repack: use tempfiles for signal cleanup Jeff King
2022-10-21 22:30 ` Junio C Hamano
2022-10-21 23:24 ` Jeff King
2022-10-21 23:45 ` Taylor Blau
2022-10-22 0:12 ` Jeff King
2022-10-22 0:11 ` Jeff King
2022-10-21 21:48 ` [PATCH 4/4] repack: drop remove_temporary_files() Jeff King
2022-10-21 23:51 ` Taylor Blau
2022-10-22 0:21 ` [PATCH v2 0/5] repack tempfile-cleanup signal deadlock Jeff King
2022-10-22 0:21 ` [PATCH v2 1/5] repack: convert "names" util bitfield to array Jeff King
2022-10-22 0:21 ` [PATCH v2 2/5] repack: populate extension bits incrementally Jeff King
2022-10-22 0:21 ` [PATCH v2 3/5] repack: expand error message for missing pack files Jeff King
2022-10-22 0:21 ` [PATCH v2 4/5] repack: use tempfiles for signal cleanup Jeff King
2022-10-22 20:35 ` Jeff King
2022-10-23 0:14 ` Junio C Hamano [this message]
2022-10-23 17:00 ` Jeff King
2022-10-23 18:08 ` Junio C Hamano
2022-10-23 20:55 ` Jeff King
2022-10-23 21:48 ` Junio C Hamano
2022-10-22 0:21 ` [PATCH v2 5/5] repack: drop remove_temporary_files() Jeff King
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