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guix package: Move generation deletion to its own procedure.

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* guix/scripts/package.scm (delete-matching-generations): New procedure,
  with code formerly found...
  (guix-package)[process-actions]: ... here.  Use it.
  Remove 'current-generation-number'.
This commit is contained in:
Ludovic Courtès 2015-04-06 20:02:22 +02:00
parent d507b277eb
commit 65d428d8f4
1 changed files with 29 additions and 27 deletions
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56
guix/scripts/package.scm
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@ -232,6 +232,34 @@ DURATION-RELATION with the current time."
filter-by-duration)
(else #f)))
(define (delete-matching-generations store profile pattern)
"Delete from PROFILE all the generations matching PATTERN. PATTERN must be
a string denoting a set of generations: the empty list means \"all generations
but the current one\", a number designates a generation, and other patterns
denote ranges as interpreted by 'matching-derivations'."
(let ((current (generation-number profile)))
(cond ((not (file-exists? profile)) ; XXX: race condition
(raise (condition (&profile-not-found-error
(profile profile)))))
((string-null? pattern)
(delete-generations (%store) profile
(delv current (profile-generations profile))))
;; Do not delete the zeroth generation.
((equal? 0 (string->number pattern))
(exit 0))
;; If PATTERN is a duration, match generations that are
;; older than the specified duration.
((matching-generations pattern profile
#:duration-relation >)
=>
(lambda (numbers)
(if (null-list? numbers)
(exit 1)
(delete-generations (%store) profile numbers))))
(else
(leave (_ "invalid syntax: ~a~%") pattern)))))
;;;
;;; Package specifications.
@ -751,9 +779,6 @@ more information.~%"))
(define dry-run? (assoc-ref opts 'dry-run?))
(define profile (assoc-ref opts 'profile))
(define current-generation-number
(generation-number profile))
;; First roll back if asked to.
(cond ((and (assoc-ref opts 'roll-back?)
(not dry-run?))
@ -782,30 +807,7 @@ more information.~%"))
(for-each
(match-lambda
(('delete-generations . pattern)
(cond ((not (file-exists? profile)) ; XXX: race condition
(raise (condition (&profile-not-found-error
(profile profile)))))
((string-null? pattern)
(delete-generations
(%store) profile
(delete current-generation-number
(profile-generations profile))))
;; Do not delete the zeroth generation.
((equal? 0 (string->number pattern))
(exit 0))
;; If PATTERN is a duration, match generations that are
;; older than the specified duration.
((matching-generations pattern profile
#:duration-relation >)
=>
(lambda (numbers)
(if (null-list? numbers)
(exit 1)
(delete-generations (%store) profile numbers))))
(else
(leave (_ "invalid syntax: ~a~%")
pattern)))
(delete-matching-generations (%store) profile pattern)
(process-actions
(alist-delete 'delete-generations opts)))