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guix system: Decorate GRUB entries of old generations with date and number. 

* guix/scripts/system.scm (seconds->string): New procedure.
  (previous-grub-entries)[system->grub-entry]: Add 'number' and 'time'
  parameters.  Adjust call accordingly.
This commit is contained in:
Ludovic Courtès 2014-11-11 22:27:24 +01:00
parent f34c56be3a
commit 906b1b0986
1 changed files with 19 additions and 5 deletions
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24
guix/scripts/system.scm
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@ -34,6 +34,7 @@
#:use-module (gnu system grub)
#:use-module (gnu packages grub)
#:use-module (srfi srfi-1)
#:use-module (srfi srfi-19)
#:use-module (srfi srfi-26)
#:use-module (srfi srfi-37)
#:use-module (ice-9 match)
@ -216,9 +217,15 @@ it atomically, and then run OS's activation script."
#f
(apply throw args)))))
(define (seconds->string seconds)
"Return a string representing the date for SECONDS."
(let ((time (make-time time-utc 0 seconds)))
(date->string (time-utc->date time)
"~Y-~m-~d ~H:~M")))
(define* (previous-grub-entries #:optional (profile %system-profile))
"Return a list of 'menu-entry' for the generations of PROFILE."
(define (system->grub-entry system)
(define (system->grub-entry system number time)
(unless-file-not-found
(call-with-input-file (string-append system "/parameters")
(lambda (port)
@ -228,7 +235,9 @@ it atomically, and then run OS's activation script."
('kernel linux)
_ ...)
(menu-entry
(label label)
(label (string-append label " (#"
(number->string number) ", "
(seconds->string time) ")"))
(linux linux)
(linux-arguments
(list (string-append "--root=" root)
@ -240,9 +249,14 @@ it atomically, and then run OS's activation script."
system)
#f))))))
(let ((systems (map (cut generation-file-name profile <>)
(generation-numbers profile))))
(filter-map system->grub-entry systems)))
(let* ((numbers (generation-numbers profile))
(systems (map (cut generation-file-name profile <>)
numbers))
(times (map (lambda (system)
(unless-file-not-found
(stat:mtime (lstat system))))
systems)))
(filter-map system->grub-entry systems numbers times)))
;;;