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build: shepherd: Check for container support.

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Fixes: <https://issues.guix.gnu.org/43533>.

* gnu/build/shepherd.scm (fork+exec-command/container): Check if containers
are supported before joining PID namespaces.
This commit is contained in:
Mathieu Othacehe 2020-09-21 10:11:17 +02:00
parent c515bbae0c
commit 6453915cf7
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GPG key ID: 8354763531769CA6
1 changed files with 11 additions and 5 deletions
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16
gnu/build/shepherd.scm
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@ -1,5 +1,6 @@
;;; GNU Guix --- Functional package management for GNU
;;; Copyright © 2017, 2018, 2019, 2020 Ludovic Courtès <ludo@gnu.org>
;;; Copyright © 2020 Mathieu Othacehe <othacehe@gnu.org>
;;;
;;; This file is part of GNU Guix.
;;;
@ -196,11 +197,16 @@ (define* (fork+exec-command/container command
#:allow-other-keys
#:rest args)
"This is a variant of 'fork+exec-command' procedure, that joins the
namespaces of process PID beforehand."
(container-excursion* pid
(lambda ()
(apply fork+exec-command command
(strip-keyword-arguments '(#:pid) args)))))
namespaces of process PID beforehand. If there is no support for containers,
on Hurd systems for instance, fallback to direct forking."
(let ((container-support?
(file-exists? "/proc/self/ns"))
(fork-proc (lambda ()
(apply fork+exec-command command
(strip-keyword-arguments '(#:pid) args)))))
(if container-support?
(container-excursion* pid fork-proc)
(fork-proc))))
;; Local Variables:
;; eval: (put 'container-excursion* 'scheme-indent-function 1)