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;;; GNU Guix --- Functional package management for GNU
;;; Copyright © 2012, 2013, 2015, 2016, 2017 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 scripts)
#:use-module (guix store)
#:use-module (guix hash)
#:use-module (guix base16)
#:use-module (guix base32)
#:use-module ((guix download) #:hide (url-fetch))
#:use-module ((guix build download)
#:select (url-fetch current-terminal-columns))
#:use-module ((guix build syscalls)
#:select (terminal-columns))
#:use-module (web uri)
#:use-module (ice-9 match)
#:use-module (srfi srfi-1)
#:use-module (srfi srfi-26)
#:use-module (srfi srfi-37)
#:use-module (rnrs bytevectors)
#:use-module (ice-9 binary-ports)
#:export (guix-download))
;;;
;;; Command-line options.
;;;
(define (download-to-file url file)
"Download the file at URI to FILE. Return FILE."
(let ((uri (string->uri url)))
(match (uri-scheme uri)
((or 'file #f)
(copy-file (uri-path uri) file))
(_
(url-fetch url file)))
file))
(define* (download-to-store* url #:key (verify-certificate? #t))
(with-store store
(download-to-store store url
#:verify-certificate? verify-certificate?)))
(define %default-options
;; Alist of default option values.
`((format . ,bytevector->nix-base32-string)
(verify-certificate? . #t)
(download-proc . ,download-to-store*)))
(define (show-help)
(display (_ "Usage: guix download [OPTION] URL
Download the file at URL to the store or to the given file, and print its
file name and the hash of its contents.
Supported formats: 'nix-base32' (default), 'base32', and 'base16'
('hex' and 'hexadecimal' can be used as well).\n"))
(format #t (_ "
-f, --format=FMT write the hash in the given format"))
(format #t (_ "
--no-check-certificate
do not validate the certificate of HTTPS servers "))
(format #f (_ "
-o, --output=FILE download to FILE"))
(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
(leave (_ "unsupported hash format: ~a~%") arg))))
(alist-cons 'format fmt-proc
(alist-delete 'format result))))
(option '("no-check-certificate") #f #f
(lambda (opt name arg result)
(alist-cons 'verify-certificate? #f result)))
(option '(#\o "output") #t #f
(lambda (opt name arg result)
(alist-cons 'download-proc
(lambda* (url #:key verify-certificate?)
(download-to-file url arg))
(alist-delete 'download 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)
(when (assq 'argument result)
(leave (_ "~A: extraneous argument~%") arg))
(alist-cons 'argument arg result))
%default-options))
(with-error-handling
(let* ((opts (parse-options))
(arg (or (assq-ref opts 'argument)
(leave (_ "no download URI was specified~%"))))
(uri (or (string->uri arg)
(leave (_ "~a: failed to parse URI~%")
arg)))
(fetch (assq-ref opts 'download-proc))
(path (parameterize ((current-terminal-columns
(terminal-columns)))
(fetch arg
#:verify-certificate?
(assq-ref opts 'verify-certificate?))))
(hash (call-with-input-file
(or path
(leave (_ "~a: download failed~%")
arg))
port-sha256))
(fmt (assq-ref opts 'format)))
(format #t "~a~%~a~%" path (fmt hash))
#t)))
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