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;;; GNU Guix --- Functional package management for GNU
;;; Copyright © 2012 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 trivial)
  #:use-module (guix store)
  #:use-module (guix utils)
  #:use-module (guix derivations)
  #:use-module (guix packages)
  #:use-module (guix build-system)
  #:use-module (ice-9 match)
  #:export (trivial-build-system))

(define* (trivial-build store name source inputs
                        #:key outputs guile system builder (modules '()))
  "Run build expression BUILDER, an expression, for SYSTEM.  SOURCE is
ignored."
  (define guile-for-build
    (match guile
      ((? package?)
       (package-derivation store guile system))
      ((and (? string?) (? derivation-path?))
       guile)
      (#f                                         ; the default
       (let* ((distro (resolve-interface '(gnu packages base)))
              (guile  (module-ref distro 'guile-final)))
         (package-derivation store guile system)))))

  (build-expression->derivation store name system builder inputs
                                #:outputs outputs
                                #:modules modules
                                #:guile-for-build guile-for-build))

(define trivial-build-system
  (build-system (name 'trivial)
                (description
                 "Trivial build system, to run arbitrary Scheme build expressions")
                (build trivial-build)
                (cross-build trivial-build)))