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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))
(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))
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