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environment: Do not attempt to map GID 0 when invoked as root.

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* guix/scripts/environment.scm (launch-environment/container): Set ‘gid’ to
1000 when ‘getgid’ returns zero.

Fixes: guix/guix#4234
Reported-by: Maxim Cournoyer <maxim@guixotic.coop>
Change-Id: I781f2939dfd3cda23373d2fa03e288995bce9eb9
This commit is contained in:
Ludovic Courtès 2025-12-17 18:01:04 +01:00
parent 0c60cfcd37
commit 7b9c30de1f
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1 changed files with 7 additions and 1 deletions
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8
guix/scripts/environment.scm
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@ -828,7 +828,13 @@ WHILE-LIST."
(let* ((cwd (getcwd))
(home (getenv "HOME"))
(uid (if user 1000 (getuid)))
(gid (if user 1000 (getgid)))
(gid (if user
1000
;; When running as root, always map a non-zero GID
;; or writing to 'gid_map' would fail with EPERM.
(match (getgid)
(0 1000)
(gid gid))))
;; On a foreign distro, the name service switch might be
;; dysfunctional and 'getpwuid' throws. Don't let that hamper