From: Johannes Sixt <j6t@kdbg.org>
To: Junio C Hamano <gitster@pobox.com>
Cc: Jeff King <peff@peff.net>, Jonathan Nieder <jrnieder@gmail.com>,
git@vger.kernel.org, Bart Trojanowski <bart@jukie.net>
Subject: Re: [RFC/PATCH] avoid SIGPIPE warnings for aliases
Date: Thu, 10 Jan 2013 22:52:10 +0100 [thread overview]
Message-ID: <50EF380A.9010809@kdbg.org> (raw)
In-Reply-To: <7vbocw23fq.fsf@alter.siamese.dyndns.org>
Am 10.01.2013 21:22, schrieb Junio C Hamano:
> Jeff King <peff@peff.net> writes:
>
>> Maybe the right rule is "if we are using the shell to execute, do not
>> mention SIGPIPE"? It seems a little iffy at first, but:
>>
>> 1. It tends to coincide with direct use of internal tools versus
>> external tools.
>>
>> 2. We do not reliably get SIGPIPE there, anyway, since most shells
>> will convert it into exit code 141 before we see it.
>>
>> I.e., something like:
>
> Hmph. That may be a good heuristics, but I wonder if we also want
> to special case WIFEXITED(status) && WEXITSTATUS(status) == 141 to
> pretend as if nothing went wrong, when ignore_sigpipe is in effect?
The purpose of Peff's patch is to remove the error message, but not to
pretend success (the return code remains 141).
I looked at all instances with use_shell=1 or RUN_USING_SHELL:
Most of the time, we do not care where the output of the command goes
to, which I regard as the same case as when a shell runs a command: We
don't need to report the SIGPIPE death.
The interesting cases are when git reads back the output of the command.
Here, a SIGPIPE death of the child would indicate a bug in git, I think,
and some diagnostic would be worth it. But we can just as well declare
that git doesn't have bugs ;)
These are the interesting cases:
connect.c:640: conn->use_shell = 1;
a connection to a local repository
convert.c:372: child_process.use_shell = 1;
clean/smudge filter
credential.c:216: helper.use_shell = 1;
credential helper
diff.c:4851: child.use_shell = 1;
textconv
All in all, I think the heuristics makes sense.
-- Hannes
next prev parent reply other threads:[~2013-01-10 21:52 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-01-04 12:47 [RFC/PATCH] avoid SIGPIPE warnings for aliases Jeff King
2013-01-04 16:55 ` Johannes Sixt
2013-01-04 21:25 ` Jeff King
2013-01-04 22:20 ` Junio C Hamano
2013-01-05 14:03 ` Jeff King
2013-01-05 14:49 ` [PATCH] run-command: encode signal death as a positive integer Jeff King
2013-01-05 19:50 ` Johannes Sixt
2013-01-05 22:19 ` Jonathan Nieder
2013-01-05 23:12 ` Jeff King
2013-01-05 23:58 ` Jonathan Nieder
2013-01-06 7:05 ` Junio C Hamano
2013-01-09 20:48 ` [RFC/PATCH] avoid SIGPIPE warnings for aliases Junio C Hamano
2013-01-09 20:51 ` Jeff King
2013-01-09 21:49 ` Junio C Hamano
2013-01-10 0:18 ` Jonathan Nieder
2013-01-10 0:39 ` Junio C Hamano
2013-01-10 11:26 ` Jeff King
2013-01-10 20:22 ` Junio C Hamano
2013-01-10 21:39 ` Jeff King
2013-01-10 21:52 ` Johannes Sixt [this message]
2013-01-10 22:51 ` Junio C Hamano
2013-01-10 10:49 ` Jeff King
2014-07-21 6:45 ` mimimimi
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