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+;;; GNU Guix --- Functional package management for GNU
+;;; Copyright © 2016 Ricardo Wurmus <rekado@elephly.net>
+;;;
+;;; 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 hg)
+ #:use-module (guix build utils)
+ #:export (hg-fetch))
+
+;;; Commentary:
+;;;
+;;; This is the build-side support code of (guix hg-download). It allows a
+;;; Mercurial repository to be cloned and checked out at a specific changeset
+;;; identifier.
+;;;
+;;; Code:
+
+(define* (hg-fetch url changeset directory
+ #:key (hg-command "hg"))
+ "Fetch CHANGESET from URL into DIRECTORY. CHANGESET must be a valid
+Mercurial changeset identifier. Return #t on success, #f otherwise."
+
+ (and (zero? (system* hg-command
+ "clone" url
+ "--rev" changeset
+ ;; Disable TLS certificate verification. The hash of
+ ;; the checkout is known in advance anyway.
+ "--insecure"
+ directory))
+ (with-directory-excursion directory
+ (begin
+ ;; The contents of '.hg' vary as a function of the current
+ ;; status of the Mercurial repo. Since we want a fixed
+ ;; output, this directory needs to be taken out.
+ (delete-file-recursively ".hg")
+ #t))))
+
+;;; hg.scm ends here