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guix system: Add "describe" action.

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* guix/scripts/system.scm (show-help): Add "describe".
(process-command): Handle it.
(guix-system): Likewise.
* doc/guix.texi (Invoking guix system): Document it.
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Ludovic Courtès 2019-11-30 23:19:45 +01:00
parent 60f4564a63
commit 158032bd7d
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2 changed files with 14 additions and 1 deletions
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4
doc/guix.texi
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@ -26301,6 +26301,10 @@ bootloader boot menu:
@table @code @table @code
@item describe
Describe the current system generation: its file name, the kernel and
bootloader used, etc., as well as provenance information when available.
@item list-generations @item list-generations
List a summary of each generation of the operating system available on List a summary of each generation of the operating system available on
disk, in a human-readable way. This is similar to the disk, in a human-readable way. This is similar to the

11
guix/scripts/system.scm
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@ -921,6 +921,8 @@ Some ACTIONS support additional ARGS.\n"))
reconfigure switch to a new operating system configuration\n")) reconfigure switch to a new operating system configuration\n"))
(display (G_ "\ (display (G_ "\
roll-back switch to the previous operating system configuration\n")) roll-back switch to the previous operating system configuration\n"))
(display (G_ "\
describe describe the current system\n"))
(display (G_ "\ (display (G_ "\
list-generations list the system generations\n")) list-generations list the system generations\n"))
(display (G_ "\ (display (G_ "\
@ -1196,6 +1198,12 @@ argument list and OPTS is the option alist."
((pattern) pattern) ((pattern) pattern)
(x (leave (G_ "wrong number of arguments~%")))))) (x (leave (G_ "wrong number of arguments~%"))))))
(list-generations pattern))) (list-generations pattern)))
((describe)
(match (generation-number %system-profile)
(0
(error (G_ "no system generation, nothing to describe~%")))
(generation
(display-system-generation generation))))
((search) ((search)
(apply (resolve-subcommand "search") args)) (apply (resolve-subcommand "search") args))
;; The following commands need to use the store, but they do not need an ;; The following commands need to use the store, but they do not need an
@ -1235,7 +1243,8 @@ argument list and OPTS is the option alist."
(case action (case action
((build container vm vm-image disk-image reconfigure init ((build container vm vm-image disk-image reconfigure init
extension-graph shepherd-graph extension-graph shepherd-graph
list-generations delete-generations roll-back list-generations describe
delete-generations roll-back
switch-generation search docker-image) switch-generation search docker-image)
(alist-cons 'action action result)) (alist-cons 'action action result))
(else (leave (G_ "~a: unknown action~%") action)))))) (else (leave (G_ "~a: unknown action~%") action))))))