summaryrefslogtreecommitdiff
path: root/guix-download.in
blob: f76396b97ce3113b78e362b22db869651277e80a (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
#!/bin/sh
# aside from this initial boilerplate, this is actually -*- scheme -*- code

prefix="@prefix@"
datarootdir="@datarootdir@"

GUILE_LOAD_COMPILED_PATH="@guilemoduledir@:$GUILE_LOAD_COMPILED_PATH"
export GUILE_LOAD_COMPILED_PATH

main='(module-ref (resolve-interface '\''(guix-download)) '\'guix-download')'
exec ${GUILE-@GUILE@} -L "@guilemoduledir@" -l "$0"    \
         -c "(apply $main (cdr (command-line)))" "$@"
!#
;;; Guix --- Nix package management from Guile.
;;; 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/>.

(define-module (guix-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 #t #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)
  (format #t (_ "
Report bugs to: ~a.~%") "@PACKAGE_BUGREPORT@"))

(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))

  (setlocale LC_ALL "")
  (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))
                                 #t #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))