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build: container: Make 'unprivileged-user-namespace-supported?' more robust.

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* gnu/build/linux-container.scm (unprivileged-user-namespace-supported?): Only
  read and check the first character, to cope with a possible newline in the
  (pseudo-)file.
This commit is contained in:
Mark H Weaver 2016-01-23 18:40:33 -05:00
parent fe17fb4a2c
commit c5184468f5
1 changed files with 1 additions and 1 deletions
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2
gnu/build/linux-container.scm
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@ -41,7 +41,7 @@ (define (unprivileged-user-namespace-supported?)
"Return #t if user namespaces can be created by unprivileged users."
(let ((userns-file "/proc/sys/kernel/unprivileged_userns_clone"))
(if (file-exists? userns-file)
(string=? "1" (call-with-input-file userns-file read-string))
(eqv? #\1 (call-with-input-file userns-file read-char))
#t)))
(define (setgroups-supported?)