aboutsummaryrefslogtreecommitdiff
path: root/guix-download.in
blob: 46efaa17e80b6482ca918d3dd6cfa0cbaa00a4b6 (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
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
#!/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 (web uri)
  #:use-module (web client)
  #:use-module (web response)
  #:use-module (guix ui)
  #:use-module (guix store)
  #:use-module (guix utils)
  #:use-module (guix base32)
  #:use-module (guix ftp-client)
  #: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 (http-fetch url port)
  "Fetch from URL over HTTP and write the result to PORT."
  (let*-values (((response data) (http-get url #:decode-body? #f))
                ((code) (response-code response)))
    (if (= code 200)
        (put-bytevector port data)
        (leave (_ "failed to download from `~a': ~a: ~a~%")
               (uri->string url)
               code (response-reason-phrase response)))))

(define (ftp-fetch url port)
  "Fetch from URL over FTP and write the result to PORT."
  (let* ((conn (ftp-open (uri-host url)
                         (or (uri-port url) 21)))
         (dir  (dirname (uri-path url)))
         (file (basename (uri-path url)))
         (in   (ftp-retr conn file dir)))
    (define len 65536)
    (define buffer
      (make-bytevector len))

    (let loop ((count (get-bytevector-n! in buffer 0 len)))
      (if (eof-object? count)
          (ftp-close conn)
          (begin
            (put-bytevector port buffer 0 count)
            (loop (get-bytevector-n! in buffer 0 len)))))))


;;;
;;; 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))
         (uri   (string->uri (assq-ref opts 'argument)))
         (fetch (case (uri-scheme uri)
                  ((http) http-fetch)
                  ((ftp)  ftp-fetch)
                  (else
                   (begin
                     (format (current-error-port)
                             (_ "guix-download: ~a: unsupported URI scheme~%")
                             (uri-scheme uri))
                     (exit 1)))))
         (path  (call-with-temporary-output-file
                 (lambda (name port)
                   (fetch uri port)
                   (close port)
                   (add-to-store store (basename (uri-path uri))
                                 #t #f "sha256" name))))
         (hash  (call-with-input-file path
                  (compose sha256 get-bytevector-all)))
         (fmt   (assq-ref opts 'format)))
    (format #t "~a~%~a~%" path (fmt hash))
    #t))