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environment: '-C' doesn't throw when the NSS is dysfunctional.

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Previously, if the name service switch was dysfunctional, as can happen
on foreign distros lacking nscd, "guix shell -C" would crash with a
backtrace on the uncaught 'getpwuid' exception.  To address that, catch
the exception and deal with it gracefully.

Reported by remsd1 on #guix.

* guix/scripts/environment.scm (launch-environment/container): Wrap
'getpwuid' call in 'false-if-exception'.
This commit is contained in:
Ludovic Courtès 2022-12-08 16:30:52 +01:00
parent 416a691cff
commit 0406df0b9b
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1 changed files with 11 additions and 4 deletions
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15
guix/scripts/environment.scm
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@ -728,14 +728,21 @@ (define fhs-mappings
(home (getenv "HOME"))
(uid (if user 1000 (getuid)))
(gid (if user 1000 (getgid)))
(passwd (let ((pwd (getpwuid (getuid))))
;; On a foreign distro, the name service switch might be
;; dysfunctional and 'getpwuid' throws. Don't let that hamper
;; operations.
(passwd (let ((pwd (false-if-exception (getpwuid (getuid)))))
(password-entry
(name (or user (passwd:name pwd)))
(real-name (if user
(name (or user
(and=> pwd passwd:name)
(getenv "USER")
"charlie"))
(real-name (if (or user (not pwd))
""
(passwd:gecos pwd)))
(uid uid) (gid gid) (shell bash)
(directory (if user
(directory (if (or user (not pwd))
(string-append "/home/" user)
(passwd:dir pwd))))))
(groups (list (group-entry (name "users") (gid gid))