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authorMathieu Othacehe <othacehe@gnu.org>2020-09-21 10:11:17 +0200
committerMathieu Othacehe <othacehe@gnu.org>2020-09-21 10:22:12 +0200
commit6453915cf7729203ef9552c13cb4528c6f4ed122 (patch)
tree2b342c4a2ad39feddec5d1a344b4c7982430e61c /gnu/build
parentc515bbae0cbb19f7afbc1c732ac725a57bd1964d (diff)
downloadguix-6453915cf7729203ef9552c13cb4528c6f4ed122.tar.gz
build: shepherd: Check for container support.
Fixes: <https://issues.guix.gnu.org/43533>.

* gnu/build/shepherd.scm (fork+exec-command/container): Check if containers
are supported before joining PID namespaces.
Diffstat (limited to 'gnu/build')
-rw-r--r--gnu/build/shepherd.scm16
1 files changed, 11 insertions, 5 deletions
diff --git a/gnu/build/shepherd.scm b/gnu/build/shepherd.scm
index 65141bd60f..91646288d5 100644
--- a/gnu/build/shepherd.scm
+++ b/gnu/build/shepherd.scm
@@ -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 @@ namespace, in addition to essential bind-mounts such /proc."
                                       #: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)