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linux-container: 'container-excursion*' marks its FDs as FD_CLOEXEC.

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Fixes <https://issues.guix.gnu.org/57827>.
Reported by Mathieu Othacehe <othacehe@gnu.org>.

Fixes a regression introduced with the Shepherd 0.9.2 upgrade in
1ba0e38267, whereby IN and OUT would no
longer be closed when 'fork+exec-command/container' would call
'exec-command*' as part of the THUNK passed to 'container-excursion*'.

This is because the Shepherd 0.9.2 assumes file descriptors are properly
marked as O_CLOEXEC and, consequently, 'exec-command' no longer run the
close(2) loop prior to 'exec'.

* gnu/build/linux-container.scm (container-excursion*): Add calls to
'fcntl'.
This commit is contained in:
Ludovic Courtès 2022-09-20 19:20:53 +02:00
parent 76c58ed59c
commit 6abdcef4a6
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1 changed files with 5 additions and 1 deletions
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6
gnu/build/linux-container.scm
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@ -1,6 +1,6 @@
;;; GNU Guix --- Functional package management for GNU
;;; Copyright © 2015 David Thompson <davet@gnu.org>
;;; Copyright © 2017, 2018, 2019 Ludovic Courtès <ludo@gnu.org>
;;; Copyright © 2017-2019, 2022 Ludovic Courtès <ludo@gnu.org>
;;;
;;; This file is part of GNU Guix.
;;;
@ -442,6 +442,10 @@ (define (container-excursion* pid thunk)
"Like 'container-excursion', but return the return value of THUNK."
(match (pipe)
((in . out)
;; Make sure IN and OUT are not inherited if THUNK forks + execs.
(fcntl in F_SETFD FD_CLOEXEC)
(fcntl out F_SETFD FD_CLOEXEC)
(match (container-excursion pid
(lambda ()
(close-port in)