guix: channels: Introduce "channel-with-substitutes-available".
* guix/channels.scm (find-latest-commit-with-substitutes, channel-with-substitutes-available): New procedures. * guix/scripts/pull.scm (guix-pull): Move "channel-list" call inside the %current-system parameter scope. * doc/guix.texi (Channels with substitutes): New section.master
Mathieu Othacehe
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63c237d044
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@ -40,7 +40,7 @@ Copyright @copyright{} 2016, 2017, 2018, 2019, 2020 Julien Lepiller@*
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Copyright @copyright{} 2016 Alex ter Weele@*
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Copyright @copyright{} 2016, 2017, 2018, 2019 Christopher Baines@*
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Copyright @copyright{} 2017, 2018, 2019 Clément Lassieur@*
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Copyright @copyright{} 2017, 2018, 2020 Mathieu Othacehe@*
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Copyright @copyright{} 2017, 2018, 2020, 2021 Mathieu Othacehe@*
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Copyright @copyright{} 2017 Federico Beffa@*
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Copyright @copyright{} 2017, 2018 Carlo Zancanaro@*
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Copyright @copyright{} 2017 Thomas Danckaert@*
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@ -245,6 +245,7 @@ Channels
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* Specifying Channel Authorizations:: Defining channel authors authorizations.
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* Primary URL:: Distinguishing mirror to original.
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* Writing Channel News:: Communicating information to channel's users.
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* Channels with Substitutes:: Using channels with available substitutes.
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Development
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@ -4919,6 +4920,7 @@ updates.
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* Specifying Channel Authorizations:: Defining channel authors authorizations.
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* Primary URL:: Distinguishing mirror to original.
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* Writing Channel News:: Communicating information to channel's users.
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* Channels with Substitutes:: Using channels with available substitutes.
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@end menu
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@node Specifying Additional Channels
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@ -5390,6 +5392,30 @@ xgettext -o news.po -l scheme -ken etc/news.txt
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To sum up, yes, you could use your channel as a blog. But beware, this
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is @emph{not quite} what your users might expect.
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@node Channels with Substitutes
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@section Channels with Substitutes
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When running @command{guix pull}, Guix will first compile the
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definitions of every available package. This is an expensive operation
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for which substitutes (@pxref{Substitutes}) may be available. The
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following snippet in @file{channels.scm} will ensure that @command{guix
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pull} uses the latest commit with available substitutes for the package
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definitions: this is done by querying the continuous integration
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server at @url{https://ci.guix.gnu.org}.
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@lisp
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(use-modules (guix ci))
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(list (channel-with-substitutes-available
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%default-guix-channel
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"https://ci.guix.gnu.org"))
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@end lisp
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Note that this does not mean that all the packages that you will
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install after running @command{guix pull} will have available
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substitutes. It only ensures that @command{guix pull} will not try to
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compile package definitions. This is particularly useful when using
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machines with limited resources.
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@c *********************************************************************
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@node Development
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@ -20,6 +20,7 @@
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(define-module (guix channels)
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#:use-module (git)
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#:use-module (guix ci)
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#:use-module (guix git)
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#:use-module (guix git-authenticate)
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#:use-module ((guix openpgp)
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38
guix/ci.scm
38
guix/ci.scm
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@ -19,9 +19,11 @@
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(define-module (guix ci)
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#:use-module (guix http-client)
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#:use-module (guix utils)
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#:use-module (json)
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#:use-module (srfi srfi-1)
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#:use-module (ice-9 match)
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#:autoload (guix channels) (channel)
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#:export (build-product?
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build-product-id
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build-product-type
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@ -52,7 +54,9 @@
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latest-builds
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evaluation
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latest-evaluations
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evaluations-for-commit))
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evaluations-for-commit
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channel-with-substitutes-available))
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;;; Commentary:
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;;;
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@ -165,3 +169,35 @@ as one of their inputs."
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(string=? (checkout-commit checkout) commit))
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(evaluation-checkouts evaluation)))
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(latest-evaluations url limit)))
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(define (find-latest-commit-with-substitutes url)
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"Return the latest commit with available substitutes for the Guix package
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definitions at URL. Return false if no commit were found."
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(let* ((job-name (string-append "guix." (%current-system)))
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(build (match (latest-builds url 1
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#:job job-name
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#:status 0) ;success
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((build) build)
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(_ #f)))
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(evaluation (and build
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(evaluation url (build-evaluation build))))
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(commit (and evaluation
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(match (evaluation-checkouts evaluation)
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((checkout)
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(checkout-commit checkout))))))
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commit))
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(define (channel-with-substitutes-available chan url)
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"Return a channel inheriting from CHAN but which commit field is set to the
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latest commit with available substitutes for the Guix package definitions at
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URL. The current system is taken into account.
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If no commit with available substitutes were found, the commit field is set to
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false and a warning message is printed."
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(let ((commit (find-latest-commit-with-substitutes url)))
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(unless commit
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(warning (G_ "could not find available substitutes at ~a~%")
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url))
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(channel
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(inherit chan)
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(commit commit))))
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@ -765,60 +765,61 @@ Use '~/.config/guix/channels.scm' instead."))
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#:argument-handler no-arguments))
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(substitutes? (assoc-ref opts 'substitutes?))
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(dry-run? (assoc-ref opts 'dry-run?))
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(channels (channel-list opts))
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(profile (or (assoc-ref opts 'profile) %current-profile))
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(current-channels (profile-channels profile))
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(validate-pull (assoc-ref opts 'validate-pull))
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(authenticate? (assoc-ref opts 'authenticate-channels?)))
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(cond ((assoc-ref opts 'query)
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(process-query opts profile))
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((assoc-ref opts 'generation)
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(process-generation-change opts profile))
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(else
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(with-store store
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(with-status-verbosity (assoc-ref opts 'verbosity)
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(parameterize ((%current-system (assoc-ref opts 'system))
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(%graft? (assoc-ref opts 'graft?)))
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(with-build-handler (build-notifier #:use-substitutes?
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substitutes?
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#:verbosity
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(assoc-ref opts 'verbosity)
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#:dry-run? dry-run?)
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(set-build-options-from-command-line store opts)
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(ensure-default-profile)
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(honor-x509-certificates store)
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(cond
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((assoc-ref opts 'query)
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(process-query opts profile))
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((assoc-ref opts 'generation)
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(process-generation-change opts profile))
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(else
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(with-store store
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(with-status-verbosity (assoc-ref opts 'verbosity)
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(parameterize ((%current-system (assoc-ref opts 'system))
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(%graft? (assoc-ref opts 'graft?)))
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(with-build-handler (build-notifier #:use-substitutes?
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substitutes?
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#:verbosity
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(assoc-ref opts 'verbosity)
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#:dry-run? dry-run?)
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(set-build-options-from-command-line store opts)
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(ensure-default-profile)
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(honor-x509-certificates store)
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(let ((instances
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(latest-channel-instances store channels
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#:current-channels
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current-channels
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#:validate-pull
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validate-pull
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#:authenticate?
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authenticate?)))
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(format (current-error-port)
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(N_ "Building from this channel:~%"
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"Building from these channels:~%"
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(length instances)))
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(for-each (lambda (instance)
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(let ((channel
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(channel-instance-channel instance)))
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(format (current-error-port)
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" ~10a~a\t~a~%"
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(channel-name channel)
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(channel-url channel)
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(string-take
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(channel-instance-commit instance)
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7))))
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instances)
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(parameterize ((%guile-for-build
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(package-derivation
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store
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(if (assoc-ref opts 'bootstrap?)
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%bootstrap-guile
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(default-guile)))))
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(with-profile-lock profile
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(run-with-store store
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(build-and-install instances profile)))))))))))))))
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(let* ((channels (channel-list opts))
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(instances
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(latest-channel-instances store channels
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#:current-channels
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current-channels
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#:validate-pull
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validate-pull
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#:authenticate?
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authenticate?)))
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(format (current-error-port)
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(N_ "Building from this channel:~%"
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"Building from these channels:~%"
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(length instances)))
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(for-each (lambda (instance)
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(let ((channel
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(channel-instance-channel instance)))
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(format (current-error-port)
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" ~10a~a\t~a~%"
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(channel-name channel)
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(channel-url channel)
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(string-take
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(channel-instance-commit instance)
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7))))
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instances)
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(parameterize ((%guile-for-build
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(package-derivation
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store
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(if (assoc-ref opts 'bootstrap?)
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%bootstrap-guile
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(default-guile)))))
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(with-profile-lock profile
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(run-with-store store
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(build-and-install instances profile)))))))))))))))
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;;; pull.scm ends here
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