Add (guix download) and (guix build download).

* guix/download.scm, guix/build/download.scm: New files.
* Makefile.am (MODULES): Add them.
* tests/builders.scm ("url-fetch"): New test.
* distro/packages/bootstrap.scm (bootstrap-origin): Support
  `url-fetch'.
* guix/snix.scm (snix-derivation->guix-package): Use `url-fetch' instead
  of `http-fetch'.

1 files changed, 73 insertions, 0 deletions

diff --git a/guix/download.scm b/guix/download.scm
new file mode 100644
index 0000000000..b5e8c675ac
--- /dev/null
+++ b/guix/download.scm
@@ -0,0 +1,73 @@
+;;; Guix --- Nix package management from Guile.         -*- coding: utf-8 -*-
+;;; Copyright (C) 2012 Ludovic Courtès <ludo@gnu.org>
+;;;
+;;; This file is part of Guix.
+;;;
+;;; 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.
+;;;
+;;; 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 Guix.  If not, see <http://www.gnu.org/licenses/>.
+
+(define-module (guix download)
+  #:use-module (ice-9 match)
+  #:use-module (guix derivations)
+  #:use-module (guix packages)
+  #:use-module ((guix store) #:select (derivation-path?))
+  #:use-module (guix utils)
+  #:export (url-fetch))
+
+;;; Commentary:
+;;;
+;;; Produce fixed-output derivations with data fetched over HTTP or FTP.
+;;;
+;;; Code:
+
+(define* (url-fetch store url hash-algo hash
+                    #:optional name
+                    #:key (system (%current-system)) guile)
+  "Return the path of a fixed-output derivation in STORE that fetches
+URL (a string, or a list of strings denoting alternate URLs), which is
+expected to have hash HASH of type HASH-ALGO (a symbol).  By default,
+the file name is the base name of URL; optionally, NAME can specify a
+different file name."
+  (define builder
+    `(begin
+       (use-modules (guix build download))
+       (url-fetch ',url %output)))
+
+  (define guile-for-build
+    (match guile
+      ((? package?)
+       (package-derivation store guile system))
+      ((and (? string?) (? derivation-path?))
+       guile)
+      (#f                                         ; the default
+       (let* ((distro (resolve-interface '(distro packages base)))
+              (guile  (module-ref distro 'guile-final)))
+         (package-derivation store guile system)))))
+
+  (define file-name
+    (match url
+      ((head _ ...)
+       (basename head))
+      (_
+       (basename url))))
+
+  (build-expression->derivation store (or name file-name) system
+                                builder '()
+                                #:hash-algo hash-algo
+                                #:hash hash
+                                #:modules '((guix build download)
+                                            (guix build utils)
+                                            (guix ftp-client))
+                                #:guile-for-build guile-for-build))
+
+;;; download.scm ends here