58 lines
2.1 KiB
Scheme
58 lines
2.1 KiB
Scheme
;;; Guix --- Nix package management from Guile. -*- coding: utf-8 -*-
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;;; Copyright (C) 2012 Ludovic Courtès <ludo@gnu.org>
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;;;
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;;; This file is part of Guix.
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;;;
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;;; Guix is free software; you can redistribute it and/or modify it
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;;; under the terms of the GNU General Public License as published by
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;;; the Free Software Foundation; either version 3 of the License, or (at
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;;; your option) any later version.
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;;;
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;;; Guix is distributed in the hope that it will be useful, but
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;;; WITHOUT ANY WARRANTY; without even the implied warranty of
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;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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;;; GNU General Public License for more details.
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;;;
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;;; You should have received a copy of the GNU General Public License
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;;; along with Guix. If not, see <http://www.gnu.org/licenses/>.
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;;;
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;;; Download a binary file from an external source.
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;;;
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(use-modules (ice-9 match)
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(web uri)
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(web client)
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(rnrs io ports)
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(srfi srfi-11)
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(guix utils))
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(define %url-base
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"http://www.fdn.fr/~lcourtes/software/guix/packages")
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(define (file-name->uri file)
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"Return the URI for FILE."
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(match (string-tokenize file (char-set-complement (char-set #\/)))
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((_ ... system basename)
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(string->uri (string-append %url-base "/" system "/" basename)))))
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(match (command-line)
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((_ file expected-hash)
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(let ((uri (file-name->uri file)))
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(format #t "downloading file `~a' from `~a'...~%"
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file (uri->string uri))
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(let*-values (((resp data) (http-get uri #:decode-body? #f))
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((hash) (bytevector->base16-string (sha256 data)))
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((part) (string-append file ".part")))
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(if (string=? expected-hash hash)
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(begin
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(call-with-output-file part
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(lambda (port)
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(put-bytevector port data)))
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(rename-file part file))
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(begin
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(format (current-error-port)
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"file at `~a' has SHA256 ~a; expected ~a~%"
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(uri->string uri) hash expected-hash)
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(exit 1)))))))
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