From: Eric Sunshine <sunshine@sunshineco.com>
To: Jeff King <peff@peff.net>
Cc: Junio C Hamano <gitster@pobox.com>,
Duy Nguyen <pclouds@gmail.com>,
Git Mailing List <git@vger.kernel.org>,
Stefan Beller <sbeller@google.com>,
Anthony Sottile <asottile@umich.edu>
Subject: Re: [PATCH v2 0/3] nd/clear-gitenv-upon-use-of-alias
Date: Wed, 23 Dec 2015 11:17:57 -0500 [thread overview]
Message-ID: <CAPig+cRndwJ-W1Tz8j7Bk8cFxsmDfv+e3xjbosNvON=+fKOVXg@mail.gmail.com> (raw)
In-Reply-To: <20151223093700.GA13386@sigill.intra.peff.net>
On Wed, Dec 23, 2015 at 4:37 AM, Jeff King <peff@peff.net> wrote:
> Subject: [PATCH] avoid SIGPIPE warnings for aliases
>
> When git executes an alias that specifies an external
> command, it will complain if the alias dies due to a signal.
> This is usually a good thing, as signal deaths are
> unexpected. However, SIGPIPE is not unexpected for many
> commands which produce a lot of output; it is intended that
> the user closing the pager would kill them them via SIGPIPE.
s/them them/them/
> As a result, the user might see annoying messages in a
> scenario like this:
>
> $ cat ~/.gitconfig
> [alias]
> lgbase = log --some-options
> lg = !git lgbase --more-options
> lg2 = !git lgbase --other-options
>
> $ git lg -p
> [user hits 'q' to exit pager]
> error: git lgbase --more-options died of signal 13
> fatal: While expanding alias 'lg': 'git lgbase --more-options': Success
>
> Many users won't see this, because we execute the external
> command with the shell, and a POSIX shell will silently
> rewrite the signal-death exit code into 128+signal, and we
> will treat it like a normal exit code. However, this does
> not always happen:
>
> 1. If the sub-command does not have shell metacharacters,
> we will skip the shell and exec it directly, getting
> the signal code.
>
> 2. Some shells do not do this rewriting; for example,
> setting SHELL_PATH set to zsh will reveal this problem.
>
> This patch squelches the message, and lets git exit silently
> (with the same exit code that a shell would use in case of a
> signal).
>
> The first line of the message comes from run-command's
> wait_or_whine. To silence that message, we remain quiet
> anytime we see SIGPIPE.
>
> The second line comes from handle_alias itself. It calls
> die_errno whenever run_command returns a negative value.
> However, only -1 indicates a syscall error where errno has
> something useful (note that it says the useless "success"
> above). Instead, we treat negative returns from run_command
> (except for -1) as a normal code to be passed to exit.
>
> Signed-off-by: Jeff King <peff@peff.net>
next prev parent reply other threads:[~2015-12-23 16:18 UTC|newest]
Thread overview: 39+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <CA+dzEB=2LJXiLSTqyLw8AeHNwdQicwvEiMg=hVEX0-_s1bySpA@mail.gmail.com>
2015-11-24 2:22 ` Fwd: Git clone fails during pre-commit hook due to GIT_WORK_TREE=. (regression 2.5 -> 2.6) Anthony Sottile
2015-11-24 17:57 ` Stefan Beller
2015-11-25 20:13 ` Duy Nguyen
2015-11-30 19:01 ` Duy Nguyen
2015-11-30 20:16 ` Junio C Hamano
2015-12-01 17:59 ` Duy Nguyen
2015-12-02 17:09 ` Junio C Hamano
2015-12-03 18:17 ` [PATCH 1/2] git.c: make it clear save_env() is for alias handling only Nguyễn Thái Ngọc Duy
2015-12-03 18:17 ` [PATCH 2/2] setup.c: re-fix d95138e (setup: set env $GIT_WORK_TREE when Nguyễn Thái Ngọc Duy
2015-12-04 20:35 ` Junio C Hamano
2015-12-05 5:48 ` Duy Nguyen
2015-12-05 15:32 ` [PATCH 3/2] git.c: make sure we do not leak GIT_* to alias scripts Nguyễn Thái Ngọc Duy
2015-12-07 18:54 ` Junio C Hamano
2015-12-08 16:55 ` Duy Nguyen
2015-12-08 17:20 ` Jeff King
2015-12-08 23:55 ` Junio C Hamano
2015-12-05 19:12 ` [PATCH 2/2] setup.c: re-fix d95138e (setup: set env $GIT_WORK_TREE when Duy Nguyen
2015-12-07 18:33 ` Junio C Hamano
2015-12-20 7:50 ` [PATCH v2 0/3] nd/clear-gitenv-upon-use-of-alias Nguyễn Thái Ngọc Duy
2015-12-20 7:50 ` [PATCH v2 1/3] git.c: make it clear save_env() is for alias handling only Nguyễn Thái Ngọc Duy
2015-12-20 7:50 ` [PATCH v2 2/3] setup.c: re-fix d95138e (setup: set env $GIT_WORK_TREE when Nguyễn Thái Ngọc Duy
2015-12-20 7:50 ` [PATCH v2 3/3] git.c: make sure we do not leak GIT_* to alias scripts Nguyễn Thái Ngọc Duy
2015-12-21 21:18 ` [PATCH v2 0/3] nd/clear-gitenv-upon-use-of-alias Junio C Hamano
2015-12-22 10:57 ` Duy Nguyen
2015-12-22 11:53 ` Duy Nguyen
2015-12-22 18:13 ` Junio C Hamano
2015-12-23 9:37 ` Jeff King
2015-12-23 10:20 ` Duy Nguyen
2015-12-23 16:17 ` Eric Sunshine [this message]
2015-12-23 20:37 ` Johannes Sixt
2015-12-23 21:31 ` Jeff King
2015-12-24 9:35 ` Duy Nguyen
2015-12-29 8:12 ` Jeff King
2015-12-29 21:34 ` Junio C Hamano
2015-12-21 10:22 ` [PATCH] Revert "setup: set env $GIT_WORK_TREE when work tree is set, like $GIT_DIR" Nguyễn Thái Ngọc Duy
2015-12-21 17:28 ` Junio C Hamano
2015-12-21 18:31 ` Junio C Hamano
2015-12-22 1:06 ` Duy Nguyen
2015-12-22 21:50 ` Junio C Hamano
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