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profiles: Add 'profile-generations'.

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* guix/profiles.scm (profile-generations): New procedure.
This commit is contained in:
Alex Kost 2014-09-21 14:24:09 +04:00
parent de1c158f32
commit f452e8ff10
1 changed files with 8 additions and 0 deletions
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8
guix/profiles.scm
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@ -70,6 +70,7 @@ (define-module (guix profiles)
profile-derivation
generation-number
generation-numbers
profile-generations
previous-generation-number
generation-time
generation-file-name))
@ -561,6 +562,13 @@ (define (error name* stat errno result)
profiles)
<))))
(define (profile-generations profile)
"Return a list of PROFILE's generations."
(let ((generations (generation-numbers profile)))
(if (equal? generations '(0))
'()
generations)))
(define (previous-generation-number profile number)
"Return the number of the generation before generation NUMBER of
PROFILE, or 0 if none exists. It could be NUMBER - 1, but it's not the