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+;;; GNU Guix --- Functional package management for GNU
+;;; Copyright © 2012, 2013 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 scripts download)
+ #:use-module (guix ui)
+ #:use-module (guix store)
+ #:use-module (guix utils)
+ #:use-module (guix base32)
+ #:use-module ((guix download) #:select (%mirrors))
+ #:use-module (guix build download)
+ #:use-module (web uri)
+ #:use-module (ice-9 match)
+ #:use-module (srfi srfi-1)
+ #:use-module (srfi srfi-11)
+ #:use-module (srfi srfi-26)
+ #:use-module (srfi srfi-37)
+ #:use-module (rnrs bytevectors)
+ #:use-module (rnrs io ports)
+ #:export (guix-download))
+
+(define (call-with-temporary-output-file proc)
+ (let* ((template (string-copy "guix-download.XXXXXX"))
+ (out (mkstemp! template)))
+ (dynamic-wind
+ (lambda ()
+ #t)
+ (lambda ()
+ (proc template out))
+ (lambda ()
+ (false-if-exception (delete-file template))))))
+
+(define (fetch-and-store store fetch name)
+ "Call FETCH for URI, and pass it the name of a file to write to; eventually,
+copy data from that port to STORE, under NAME. Return the resulting
+store path."
+ (call-with-temporary-output-file
+ (lambda (temp port)
+ (let ((result
+ (parameterize ((current-output-port (current-error-port)))
+ (fetch temp))))
+ (close port)
+ (and result
+ (add-to-store store name #f "sha256" temp))))))
+
+;;;
+;;; Command-line options.
+;;;
+
+(define %default-options
+ ;; Alist of default option values.
+ `((format . ,bytevector->nix-base32-string)))
+
+(define (show-help)
+ (display (_ "Usage: guix download [OPTION]... URL
+Download the file at URL, add it to the store, and print its store path
+and the hash of its contents.\n"))
+ (format #t (_ "
+ -f, --format=FMT write the hash in the given format (default: `nix-base32')"))
+ (newline)
+ (display (_ "
+ -h, --help display this help and exit"))
+ (display (_ "
+ -V, --version display version information and exit"))
+ (newline)
+ (show-bug-report-information))
+
+(define %options
+ ;; Specifications of the command-line options.
+ (list (option '(#\f "format") #t #f
+ (lambda (opt name arg result)
+ (define fmt-proc
+ (match arg
+ ("nix-base32"
+ bytevector->nix-base32-string)
+ ("base32"
+ bytevector->base32-string)
+ ((or "base16" "hex" "hexadecimal")
+ bytevector->base16-string)
+ (x
+ (format (current-error-port)
+ "unsupported hash format: ~a~%" arg))))
+
+ (alist-cons 'format fmt-proc
+ (alist-delete 'format result))))
+
+ (option '(#\h "help") #f #f
+ (lambda args
+ (show-help)
+ (exit 0)))
+ (option '(#\V "version") #f #f
+ (lambda args
+ (show-version-and-exit "guix-download")))))
+
+
+;;;
+;;; Entry point.
+;;;
+
+(define (guix-download . args)
+ (define (parse-options)
+ ;; Return the alist of option values.
+ (args-fold args %options
+ (lambda (opt name arg result)
+ (leave (_ "~A: unrecognized option~%") name))
+ (lambda (arg result)
+ (alist-cons 'argument arg result))
+ %default-options))
+
+ (install-locale)
+ (textdomain "guix")
+ (setvbuf (current-output-port) _IOLBF)
+ (setvbuf (current-error-port) _IOLBF)
+
+ (let* ((opts (parse-options))
+ (store (open-connection))
+ (arg (assq-ref opts 'argument))
+ (uri (or (string->uri arg)
+ (leave (_ "guix-download: ~a: failed to parse URI~%")
+ arg)))
+ (path (case (uri-scheme uri)
+ ((file)
+ (add-to-store store (basename (uri-path uri))
+ #f "sha256" (uri-path uri)))
+ (else
+ (fetch-and-store store
+ (cut url-fetch arg <>
+ #:mirrors %mirrors)
+ (basename (uri-path uri))))))
+ (hash (call-with-input-file
+ (or path
+ (leave (_ "guix-download: ~a: download failed~%")
+ arg))
+ (compose sha256 get-bytevector-all)))
+ (fmt (assq-ref opts 'format)))
+ (format #t "~a~%~a~%" path (fmt hash))
+ #t))