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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 build git)
+ #:use-module (guix build utils)
+ #:export (git-fetch))
+
+;;; Commentary:
+;;;
+;;; This is the build-side support code of (guix git-download). It allows a
+;;; Git repository to be cloned and checked out at a specific commit.
+;;;
+;;; Code:
+
+(define* (git-fetch url commit directory
+ #:key (git-command "git"))
+ "Fetch COMMIT from URL into DIRECTORY. COMMIT must be a valid Git commit
+identifier. Return #t on success, #f otherwise."
+ (and (zero? (system* git-command "clone" url directory))
+ (with-directory-excursion directory
+ (system* git-command "tag" "-l")
+ (and (zero? (system* git-command "checkout" commit))
+ (begin
+ ;; The contents of '.git' vary as a function of the current
+ ;; status of the Git repo. Since we want a fixed output, this
+ ;; directory needs to be taken out.
+ (delete-file-recursively ".git")
+ #t)))))
+
+;;; git.scm ends here