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authorLudovic Courtès <ludo@gnu.org>2019-03-17 17:01:56 +0100
committerLudovic Courtès <ludo@gnu.org>2019-03-17 22:55:01 +0100
commitcd2e4b2a8dbded85f7183d86be0747707e55d49e (patch)
tree823304bf3f30b664ce85e05aa7c393c5105be859 /guix
parent19c0cdb9e6271956015232421ef7f63a1ad001ae (diff)
describe: Add 'current-profile-date'.
* guix/describe.scm (current-profile-date): New procedure.
Diffstat (limited to 'guix')
-rw-r--r--guix/describe.scm25
1 files changed, 24 insertions, 1 deletions
diff --git a/guix/describe.scm b/guix/describe.scm
index 00372bbed7..893dca2640 100644
--- a/guix/describe.scm
+++ b/guix/describe.scm
@@ -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