GNU bug report logs - #73905
guix shell changes default sigaction for SIGPIPE

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Package: guix; Reported by: Tomas Volf <~@wolfsden.cz>; Keywords: patch; Done: Ludovic Courtès <ludo@HIDDEN>; Maintainer for guix is bug-guix@HIDDEN.

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From: =?utf-8?Q?Ludovic_Court=C3=A8s?= <ludo@HIDDEN>
To: Tomas Volf <~@wolfsden.cz>
Subject: Re: bug#73905: [PATCH v2] environment: Restore action for SIGPIPE.
In-Reply-To: <5077b34fc2bf3ba71d90c6a228361895b094d958.1746205135.git.~@wolfsden.cz>
 (Tomas Volf's message of "Fri, 2 May 2025 18:58:55 +0200")
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Tomas Volf <~@wolfsden.cz> writes:

> Code in `ui.scm' in `initialize-guix' procedure changes the handling of
> SIGPIPE to SIG_IGN.  So restore the handling to SIG_DFL so that process
> executed will have the usual action.  Technically we should record what the
> handling was, and restore it to the previous value, but that would be much
> more invasive change.
>
> Always setting it to SIG_DFL is at least less surprising than always setting
> to SIG_IGN.
>
> * guix/scripts/environment.scm (launch-environment): Restore default action
> for SIGPIPE.
>
> Change-Id: Ifabae1d3e71aa44e63078cea5bd3824b8f61ba14

Applied, thanks!
Notification sent to Tomas Volf <~@wolfsden.cz>:
bug acknowledged by developer. Full text available.
Reply sent to Ludovic Courtès <ludo@HIDDEN>:
You have taken responsibility. Full text available.

Message received at 73905 <at> debbugs.gnu.org:


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From: Tomas Volf <~@wolfsden.cz>
To: 73905 <at> debbugs.gnu.org
Subject: [PATCH v2] environment: Restore action for SIGPIPE.
Date: Fri,  2 May 2025 18:58:55 +0200
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Code in `ui.scm' in `initialize-guix' procedure changes the handling of
SIGPIPE to SIG_IGN.  So restore the handling to SIG_DFL so that process
executed will have the usual action.  Technically we should record what the
handling was, and restore it to the previous value, but that would be much
more invasive change.

Always setting it to SIG_DFL is at least less surprising than always setting
to SIG_IGN.

* guix/scripts/environment.scm (launch-environment): Restore default action
for SIGPIPE.

Change-Id: Ifabae1d3e71aa44e63078cea5bd3824b8f61ba14
---
 guix/scripts/environment.scm | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/guix/scripts/environment.scm b/guix/scripts/environment.scm
index 648a497743..7185c3ebd0 100644
--- a/guix/scripts/environment.scm
+++ b/guix/scripts/environment.scm
@@ -506,6 +506,8 @@ (define* (launch-environment command profile manifest
   ;; Properly handle SIGINT, so pressing C-c in an interactive terminal
   ;; application works.
   (sigaction SIGINT SIG_DFL)
+  ;; Restore original action for SIGPIPE.
+  (sigaction SIGPIPE SIG_DFL)
   (load-profile profile manifest
                 #:pure? pure? #:white-list-regexps white-list)
 
-- 
2.49.0
Information forwarded to guix@HIDDEN, dev@HIDDEN, ludo@HIDDEN, othacehe@HIDDEN, zimon.toutoune@HIDDEN, me@HIDDEN, bug-guix@HIDDEN:
bug#73905; Package guix. Full text available.
Added tag(s) patch. Request was from Tomas Volf <~@wolfsden.cz> to control <at> debbugs.gnu.org. Full text available.

Message received at 73905 <at> debbugs.gnu.org:


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From: Tomas Volf <~@wolfsden.cz>
To: 73905 <at> debbugs.gnu.org
Subject: [PATCH] environment: Restore action for SIGPIPE.
Date: Sun, 20 Oct 2024 16:43:53 +0200
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Code in `ui.scm' in `initialize-guix' procedure changes the handling of
SIGPIPE to SIG_IGN.  So restore the handling to SIG_DFL so that process
executed will have the usual action.  Technically we should record what the
handling was, and restore it to the previous value, but that would be much
more invasive change.

Always setting it to SIG_DFL is at least less surprising than always setting
to SIG_IGN.

* guix/scripts/environment.scm (launch-environment): Restore default action
for SIGPIPE.

Change-Id: Ifabae1d3e71aa44e63078cea5bd3824b8f61ba14
---
 guix/scripts/environment.scm | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/guix/scripts/environment.scm b/guix/scripts/environment.scm
index a219b2ac89..79eb7f3f30 100644
--- a/guix/scripts/environment.scm
+++ b/guix/scripts/environment.scm
@@ -499,6 +499,8 @@ (define* (launch-environment command profile manifest
   ;; Properly handle SIGINT, so pressing C-c in an interactive terminal
   ;; application works.
   (sigaction SIGINT SIG_DFL)
+  ;; Restore original action for SIGPIPE.
+  (sigaction SIGPIPE SIG_DFL)
   (load-profile profile manifest
                 #:pure? pure? #:white-list-regexps white-list)
 
-- 
2.46.0
Information forwarded to guix@HIDDEN, dev@HIDDEN, ludo@HIDDEN, othacehe@HIDDEN, zimon.toutoune@HIDDEN, me@HIDDEN, bug-guix@HIDDEN:
bug#73905; Package guix. Full text available.

Message received at submit <at> debbugs.gnu.org:


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From: Tomas Volf <~@wolfsden.cz>
To: bug-guix@HIDDEN
Subject: guix shell changes default sigaction for SIGPIPE
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Date: Sun, 20 Oct 2024 13:25:28 +0200
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--=-=-=
Content-Type: text/plain
Content-Transfer-Encoding: quoted-printable


Guix shell changes the default handler for SIGPIPE for the command it
runs.  Can be demonstrated using the following:

=2D-8<---------------cut here---------------start------------->8---
$ guix shell guile -- guile -c '(pk (sigaction SIGPIPE))'

;;; ((1 . 0))
$ guile -c '(pk (sigaction SIGPIPE))'

;;; ((0 . 0))
=2D-8<---------------cut here---------------end--------------->8---

Have a nice day,
Tomas Volf

=2D-=20
There are only two hard things in Computer Science:
cache invalidation, naming things and off-by-one errors.

--=-=-=
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--=-=-=--
Acknowledgement sent to Tomas Volf <~@wolfsden.cz>:
New bug report received and forwarded. Copy sent to bug-guix@HIDDEN. Full text available.
Report forwarded to bug-guix@HIDDEN:
bug#73905; Package guix. Full text available.
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