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;;; GNU Guix --- Functional package management for GNU
;;; Copyright © 2019-2021 Ludovic Courtès <ludo@gnu.org>
;;;
;;; This file is part of GNU Guix.
;;;
;;; GNU Guix is free software; you can redistribute it and/or modify it
;;; under the terms of the GNU General Public License as published by
;;; the Free Software Foundation; either version 3 of the License, or (at
;;; your option) any later version.
;;;
;;; GNU Guix is distributed in the hope that it will be useful, but
;;; WITHOUT ANY WARRANTY; without even the implied warranty of
;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
;;; GNU General Public License for more details.
;;;
;;; You should have received a copy of the GNU General Public License
;;; along with GNU Guix. If not, see <http://www.gnu.org/licenses/>.
(define-module (guix build-system channel)
#:use-module ((guix store) #:select (%store-monad))
#:use-module ((guix gexp) #:select (lower-object))
#:use-module (guix monads)
#:use-module (guix channels)
#:use-module (guix build-system)
#:export (channel-build-system))
;;; Commentary:
;;;
;;; The "channel" build system lets you build Guix instances from channel
;;; specifications, similar to how 'guix time-machine' would do it, as regular
;;; packages.
;;;
;;; Code:
(define channel-build-system
;; Build system used to "convert" a channel instance to a package.
(let* ((build (lambda* (name inputs
#:key source commit system
#:allow-other-keys)
(mlet* %store-monad ((source (if (string? source)
(return source)
(lower-object source)))
(instance
-> (checkout->channel-instance
source #:commit commit)))
(channel-instances->derivation (list instance)))))
(lower (lambda* (name #:key system source commit
#:allow-other-keys)
(bag
(name name)
(system system)
(build build)
(arguments `(#:source ,source
#:commit ,commit))))))
(build-system (name 'channel)
(description "Turn a channel instance into a package.")
(lower lower))))
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