diff options
Diffstat (limited to 'guix/channels.scm')
| -rw-r--r-- | guix/channels.scm | 122 |
1 files changed, 106 insertions, 16 deletions
diff --git a/guix/channels.scm b/guix/channels.scm index e57da68149..75503bb0ae 100644 --- a/guix/channels.scm +++ b/guix/channels.scm @@ -1,5 +1,6 @@ ;;; GNU Guix --- Functional package management for GNU ;;; Copyright © 2018 Ludovic Courtès <ludo@gnu.org> +;;; Copyright © 2018 Ricardo Wurmus <rekado@elephly.net> ;;; ;;; This file is part of GNU Guix. ;;; @@ -27,6 +28,7 @@ #:use-module (guix store) #:use-module (guix i18n) #:use-module (srfi srfi-1) + #:use-module (srfi srfi-2) #:use-module (srfi srfi-9) #:use-module (srfi srfi-11) #:autoload (guix self) (whole-package) @@ -73,7 +75,6 @@ (commit channel-commit (default #f)) (location channel-location (default (current-source-location)) (innate))) -;; TODO: Add a way to express dependencies among channels. (define %default-channels ;; Default list of channels. @@ -93,6 +94,12 @@ (commit channel-instance-commit) (checkout channel-instance-checkout)) +(define-record-type <channel-metadata> + (channel-metadata version dependencies) + channel-metadata? + (version channel-metadata-version) + (dependencies channel-metadata-dependencies)) + (define (channel-reference channel) "Return the \"reference\" for CHANNEL, an sexp suitable for 'latest-repository-commit'." @@ -100,20 +107,90 @@ (#f `(branch . ,(channel-branch channel))) (commit `(commit . ,(channel-commit channel))))) -(define (latest-channel-instances store channels) +(define (read-channel-metadata instance) + "Return a channel-metadata record read from the channel INSTANCE's +description file, or return #F if the channel instance does not include the +file." + (let* ((source (channel-instance-checkout instance)) + (meta-file (string-append source "/.guix-channel"))) + (and (file-exists? meta-file) + (and-let* ((raw (call-with-input-file meta-file read)) + (version (and=> (assoc-ref raw 'version) first)) + (dependencies (or (assoc-ref raw 'dependencies) '()))) + (channel-metadata + version + (map (lambda (item) + (let ((get (lambda* (key #:optional default) + (or (and=> (assoc-ref item key) first) default)))) + (and-let* ((name (get 'name)) + (url (get 'url)) + (branch (get 'branch "master"))) + (channel + (name name) + (branch branch) + (url url) + (commit (get 'commit)))))) + dependencies)))))) + +(define (channel-instance-dependencies instance) + "Return the list of channels that are declared as dependencies for the given +channel INSTANCE." + (match (read-channel-metadata instance) + (#f '()) + (($ <channel-metadata> version dependencies) + dependencies))) + +(define* (latest-channel-instances store channels #:optional (previous-channels '())) "Return a list of channel instances corresponding to the latest checkouts of -CHANNELS." - (map (lambda (channel) - (format (current-error-port) - (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)))) - (channel-instance channel commit checkout))) - channels)) +CHANNELS and the channels on which they depend. PREVIOUS-CHANNELS is a list +of previously processed channels." + ;; Only process channels that are unique, or that are more specific than a + ;; previous channel specification. + (define (ignore? channel others) + (member channel others + (lambda (a b) + (and (eq? (channel-name a) (channel-name b)) + (or (channel-commit b) + (not (or (channel-commit a) + (channel-commit b)))))))) + ;; Accumulate a list of instances. A list of processed channels is also + ;; accumulated to decide on duplicate channel specifications. + (match (fold (lambda (channel acc) + (match acc + ((#:channels previous-channels #:instances instances) + (if (ignore? channel previous-channels) + acc + (begin + (format (current-error-port) + (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))) + `(#:channels + ,(append (cons channel new-channels) + previous-channels) + #:instances + ,(append (cons instance new-instances) + instances)))))))))) + `(#:channels ,previous-channels #:instances ()) + channels) + ((#:channels channels #:instances instances) + (let ((instance-name (compose channel-name channel-instance-channel))) + ;; Remove all earlier channel specifications if they are followed by a + ;; more specific one. + (values (delete-duplicates instances + (lambda (a b) + (eq? (instance-name a) (instance-name b)))) + channels))))) (define* (checkout->channel-instance checkout #:key commit @@ -235,8 +312,21 @@ INSTANCES." (lambda (instance) (if (eq? instance core-instance) (return core) - (build-channel-instance instance - (cons core dependencies)))) + (match (channel-instance-dependencies instance) + (() + (build-channel-instance instance + (cons core dependencies))) + (channels + (mlet %store-monad ((dependencies-derivation + (latest-channel-derivation + ;; %default-channels is used here to + ;; ensure that the core channel is + ;; available for channels declared as + ;; dependencies. + (append channels %default-channels)))) + (build-channel-instance instance + (cons dependencies-derivation + (cons core dependencies)))))))) instances))) (define (whole-package-for-legacy name modules) |