describe: Add 'current-profile-date'.

* guix/describe.scm (current-profile-date): New procedure.
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Ludovic Courtès 2019-03-17 17:01:56 +01:00
parent 19c0cdb9e6
commit cd2e4b2a8d
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1 changed files with 24 additions and 1 deletions

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@ -21,10 +21,12 @@
#:use-module (guix profiles)
#:use-module (guix packages)
#:use-module ((guix utils) #:select (location-file))
#:use-module ((guix store) #:select (%store-prefix))
#:use-module ((guix store) #:select (%store-prefix store-path?))
#:use-module ((guix config) #:select (%state-directory))
#:use-module (srfi srfi-1)
#:use-module (ice-9 match)
#:export (current-profile
current-profile-date
current-profile-entries
package-path-entries
@ -55,6 +57,27 @@ or #f if this is not applicable."
(and (file-exists? (string-append candidate "/manifest"))
candidate)))))))
(define (current-profile-date)
"Return the creation date of the current profile (produced by 'guix pull'),
as a number of seconds since the Epoch, or #f if it could not be determined."
;; Normally 'current-profile' will return ~/.config/guix/current. We need
;; to 'readlink' once to get '/var/guix/…/guix-profile', whose mtime is the
;; piece of information we're looking for.
(let loop ((profile (current-profile)))
(match profile
(#f #f)
((? store-path?) #f)
(file
(if (string-prefix? %state-directory file)
(and=> (lstat file) stat:mtime)
(catch 'system-error
(lambda ()
(let ((target (readlink file)))
(loop (if (string-prefix? "/" target)
target
(string-append (dirname file) "/" target)))))
(const #f)))))))
(define current-profile-entries
(mlambda ()
"Return the list of entries in the 'guix pull' profile the calling process