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guix system: Fix 'describe' when booting the latest generation.

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Fixes a regression introduced in
9679123ce083c69cdfd1505d95a4066d41280394, whereby 'guix system describe'
would error out when /run/current-system points to /gnu/store/…-system,
which is the case when booting the latest generation or after
reconfigure.

* guix/scripts/system.scm (process-command): For 'describe'. Try
'generation-number' with and without the optional argument.
This commit is contained in:
Ludovic Courtès 2022-02-15 16:56:14 +01:00
parent ee92b0fb7d
commit 791069737c
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GPG Key ID: 090B11993D9AEBB5
1 changed files with 9 additions and 1 deletions
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10
guix/scripts/system.scm
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@ -1328,9 +1328,17 @@ argument list and OPTS is the option alist."
(x (leave (G_ "wrong number of arguments~%"))))))
(list-generations pattern)))
((describe)
;; Describe the running system, which is not necessarily the current
;; generation. /run/current-system might point to
;; /var/guix/profiles/system-N-link, or it might point directly to
;; /gnu/store/…-system. Try both.
(match (generation-number "/run/current-system" %system-profile)
(0
(leave (G_ "no system generation, nothing to describe~%")))
(match (generation-number %system-profile)
(0
(leave (G_ "no system generation, nothing to describe~%")))
(generation
(display-system-generation generation))))
(generation
(display-system-generation generation))))
((search)