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;;; GNU Guix --- Functional package management for GNU
;;; Copyright © 2014 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 git-download)
#:use-module (guix records)
#:use-module (guix derivations)
#:use-module (guix packages)
#:use-module (ice-9 match)
#:export (git-reference
git-reference?
git-reference-url
git-reference-commit
git-fetch))
;;; Commentary:
;;;
;;; An <origin> method that fetches a specific commit from a Git repository.
;;; The repository URL and commit hash are specified with a <git-reference>
;;; object.
;;;
;;; Code:
(define-record-type* <git-reference>
git-reference make-git-reference
git-reference?
(url git-reference-url)
(commit git-reference-commit))
(define* (git-fetch store ref hash-algo hash
#:optional name
#:key (system (%current-system)) guile git)
"Return a fixed-output derivation in STORE that fetches REF, a
<git-reference> object. The output is expected to have recursive hash HASH of
type HASH-ALGO (a symbol). Use NAME as the file name, or a generic name if
#f."
(define guile-for-build
(match guile
((? package?)
(package-derivation store guile system))
(#f ; the default
(let* ((distro (resolve-interface '(gnu packages base)))
(guile (module-ref distro 'guile-final)))
(package-derivation store guile system)))))
(define git-for-build
(match git
((? package?)
(package-derivation store git system))
(#f ; the default
(let* ((distro (resolve-interface '(gnu packages version-control)))
(git (module-ref distro 'git)))
(package-derivation store git system)))))
(let* ((command (string-append (derivation->output-path git-for-build)
"/bin/git"))
(builder `(begin
(use-modules (guix build git))
(git-fetch ',(git-reference-url ref)
',(git-reference-commit ref)
%output
#:git-command ',command))))
(build-expression->derivation store (or name "git-checkout") builder
#:system system
#:local-build? #t
#:inputs `(("git" ,git-for-build))
#:hash-algo hash-algo
#:hash hash
#:recursive? #t
#:modules '((guix build git)
(guix build utils))
#:guile-for-build guile-for-build
#:local-build? #t)))
;;; git-download.scm ends here
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