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+;;; 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/>.
+
+;;;
+;;; Download a binary file from an external source.
+;;;
+
+(use-modules (ice-9 match)
+ (web uri)
+ (web client)
+ (rnrs io ports)
+ (srfi srfi-11)
+ (guix utils))
+
+(define %url-base
+ "http://www.fdn.fr/~lcourtes/software/guix/packages")
+
+(define (file-name->uri file)
+ "Return the URI for FILE."
+ (match (string-tokenize file (char-set-complement (char-set #\/)))
+ ((_ ... system basename)
+ (string->uri (string-append %url-base "/" system "/" basename)))))
+
+(match (command-line)
+ ((_ file expected-hash)
+ (let ((uri (file-name->uri file)))
+ (format #t "downloading file `~a' from `~a'...~%"
+ file (uri->string uri))
+ (let*-values (((resp data) (http-get uri #:decode-body? #f))
+ ((hash) (bytevector->base16-string (sha256 data)))
+ ((part) (string-append file ".part")))
+ (if (string=? expected-hash hash)
+ (begin
+ (call-with-output-file part
+ (lambda (port)
+ (put-bytevector port data)))
+ (rename-file part file))
+ (begin
+ (format (current-error-port)
+ "file at `~a' has SHA256 ~a; expected ~a~%"
+ (uri->string uri) hash expected-hash)
+ (exit 1)))))))