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channels: Add 'latest-channel-instance'.

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* guix/channels.scm (latest-channel-instance): New procedure.
(latest-channel-instances): Use it.
This commit is contained in:
Ludovic Courtès 2020-05-06 22:18:52 +02:00
parent c263cfdcde
commit 4ba425060a
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GPG key ID: 090B11993D9AEBB5
1 changed files with 18 additions and 14 deletions
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32
guix/channels.scm
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@ -199,6 +199,14 @@ (define (channel-instance-dependencies instance)
channel INSTANCE."
(channel-metadata-dependencies (channel-instance-metadata instance)))
(define (latest-channel-instance store channel)
"Return the latest channel instance for CHANNEL."
(let-values (((checkout commit)
(latest-repository-commit store (channel-url channel)
#:ref (channel-reference
channel))))
(channel-instance channel commit checkout)))
(define* (latest-channel-instances store channels #:optional (previous-channels '()))
"Return a list of channel instances corresponding to the latest checkouts of
CHANNELS and the channels on which they depend. PREVIOUS-CHANNELS is a list
@ -224,20 +232,16 @@ (define-values (resulting-channels instances)
(G_ "Updating channel '~a' from Git repository at '~a'...~%")
(channel-name channel)
(channel-url channel))
(let-values (((checkout commit)
(latest-repository-commit store (channel-url channel)
#:ref (channel-reference
channel))))
(let ((instance (channel-instance channel commit checkout)))
(let-values (((new-instances new-channels)
(latest-channel-instances
store
(channel-instance-dependencies instance)
previous-channels)))
(values (append (cons channel new-channels)
previous-channels)
(append (cons instance new-instances)
instances))))))))
(let ((instance (latest-channel-instance store channel)))
(let-values (((new-instances new-channels)
(latest-channel-instances
store
(channel-instance-dependencies instance)
previous-channels)))
(values (append (cons channel new-channels)
previous-channels)
(append (cons instance new-instances)
instances)))))))
previous-channels
'() ;instances
channels))