130 lines
4.8 KiB
Scheme
130 lines
4.8 KiB
Scheme
;;; GNU Guix --- Functional package management for GNU
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;;; Copyright © 2014, 2015, 2016 Ludovic Courtès <ludo@gnu.org>
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;;;
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;;; This file is part of GNU Guix.
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;;;
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;;; GNU Guix is free software; you can redistribute it and/or modify it
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;;; under the terms of the GNU General Public License as published by
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;;; the Free Software Foundation; either version 3 of the License, or (at
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;;; your option) any later version.
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;;;
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;;; GNU Guix is distributed in the hope that it will be useful, but
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;;; WITHOUT ANY WARRANTY; without even the implied warranty of
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;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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;;; GNU General Public License for more details.
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;;;
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;;; You should have received a copy of the GNU General Public License
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;;; along with GNU Guix. If not, see <http://www.gnu.org/licenses/>.
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(define-module (guix grafts)
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#:use-module (guix records)
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#:use-module (guix derivations)
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#:use-module ((guix utils) #:select (%current-system))
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#:use-module (srfi srfi-1)
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#:use-module (srfi srfi-26)
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#:use-module (ice-9 match)
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#:export (graft?
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graft
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graft-origin
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graft-replacement
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graft-origin-output
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graft-replacement-output
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graft-derivation
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%graft?
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set-grafting))
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(define-record-type* <graft> graft make-graft
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graft?
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(origin graft-origin) ;derivation | store item
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(origin-output graft-origin-output ;string | #f
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(default "out"))
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(replacement graft-replacement) ;derivation | store item
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(replacement-output graft-replacement-output ;string | #f
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(default "out")))
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(define* (graft-derivation store drv grafts
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#:key
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(name (derivation-name drv))
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(guile (%guile-for-build))
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(system (%current-system)))
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"Return a derivation called NAME, based on DRV but with all the GRAFTS
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applied."
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;; XXX: Someday rewrite using gexps.
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(define mapping
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;; List of store item pairs.
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(map (match-lambda
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(($ <graft> source source-output target target-output)
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(cons (if (derivation? source)
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(derivation->output-path source source-output)
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source)
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(if (derivation? target)
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(derivation->output-path target target-output)
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target))))
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grafts))
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(define outputs
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(match (derivation-outputs drv)
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(((names . outputs) ...)
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(map derivation-output-path outputs))))
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(define output-names
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(match (derivation-outputs drv)
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(((names . outputs) ...)
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names)))
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(define build
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`(begin
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(use-modules (guix build graft)
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(guix build utils)
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(ice-9 match))
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(let ((mapping ',mapping))
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(for-each (lambda (input output)
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(format #t "grafting '~a' -> '~a'...~%" input output)
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(force-output)
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(rewrite-directory input output
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`((,input . ,output)
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,@mapping)))
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',outputs
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(match %outputs
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(((names . files) ...)
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files))))))
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(define add-label
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(cut cons "x" <>))
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(match grafts
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((($ <graft> sources source-outputs targets target-outputs) ...)
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(let ((sources (zip sources source-outputs))
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(targets (zip targets target-outputs)))
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(build-expression->derivation store name build
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#:system system
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#:guile-for-build guile
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#:modules '((guix build graft)
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(guix build utils))
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#:inputs `(,@(map (lambda (out)
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`("x" ,drv ,out))
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output-names)
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,@(append (map add-label sources)
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(map add-label targets)))
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#:outputs output-names
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#:local-build? #t)))))
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;; The following might feel more at home in (guix packages) but since (guix
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;; gexp), which is a lower level, needs them, we put them here.
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(define %graft?
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;; Whether to honor package grafts by default.
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(make-parameter #t))
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(define (set-grafting enable?)
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"This monadic procedure enables grafting when ENABLE? is true, and disables
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it otherwise. It returns the previous setting."
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(lambda (store)
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(values (%graft? enable?) store)))
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;;; grafts.scm ends here
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