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cache: 'file-expiration-time' uses 'lstat', not 'stat'.

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Fixes a bug whereby 'cached-channel-instance' would potentially consider
cache entries obsolete too early because they refer to items in the
store, which is mounted as 'noatime' on Guix System.

* guix/cache.scm (file-expiration-time): Use 'lstat' and
'false-if-exception' rather than 'stat'.  This matches what (guix
scripts shell) does.
This commit is contained in:
Ludovic Courtès 2023-07-11 00:27:31 +02:00
parent e1c2c2f042
commit fe3321f91a
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1 changed files with 2 additions and 2 deletions
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guix/cache.scm
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@ -1,5 +1,5 @@
;;; GNU Guix --- Functional package management for GNU
;;; Copyright © 2013, 2014, 2015, 2016, 2017, 2020, 2021 Ludovic Courtès <ludo@gnu.org>
;;; Copyright © 2013-2017, 2020-2021, 2023 Ludovic Courtès <ludo@gnu.org>
;;; Copyright © 2022 Simon Tournier <zimon.toutoune@gmail.com>
;;;
;;; This file is part of GNU Guix.
@ -55,7 +55,7 @@ (define* (file-expiration-time ttl #:optional (timestamp stat:atime))
time\" computed as its timestamp + TTL seconds. Call TIMESTAMP to obtain the
relevant timestamp from the result of 'stat'."
(lambda (file)
(match (stat file #f)
(match (false-if-exception (lstat file))
(#f 0) ;FILE may have been deleted in the meantime
(st (+ (timestamp st) ttl)))))