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1 | ;;; GNU Guix --- Functional package management for GNU |
2 | ;;; Copyright © 2012, 2013 Ludovic Courtès <ludo@gnu.org> | |
3 | ;;; Copyright © 2013 Nikita Karetnikov <nikita@karetnikov.org> | |
4 | ;;; | |
5 | ;;; This file is part of GNU Guix. | |
6 | ;;; | |
7 | ;;; GNU Guix is free software; you can redistribute it and/or modify it | |
8 | ;;; under the terms of the GNU General Public License as published by | |
9 | ;;; the Free Software Foundation; either version 3 of the License, or (at | |
10 | ;;; your option) any later version. | |
11 | ;;; | |
12 | ;;; GNU Guix is distributed in the hope that it will be useful, but | |
13 | ;;; WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | ;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | ;;; GNU General Public License for more details. | |
16 | ;;; | |
17 | ;;; You should have received a copy of the GNU General Public License | |
18 | ;;; along with GNU Guix. If not, see <http://www.gnu.org/licenses/>. | |
19 | ||
20 | (define-module (guix scripts hash) | |
72626a71 LC |
21 | #:use-module (guix base32) |
22 | #:use-module (guix hash) | |
23 | #:use-module (guix ui) | |
24 | #:use-module (guix utils) | |
25 | #:use-module (rnrs io ports) | |
26 | #:use-module (rnrs files) | |
27 | #:use-module (ice-9 match) | |
28 | #:use-module (srfi srfi-1) | |
29 | #:use-module (srfi srfi-26) | |
30 | #:use-module (srfi srfi-37) | |
31 | #:export (guix-hash)) | |
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32 | |
33 | \f | |
34 | ;;; | |
35 | ;;; Command-line options. | |
36 | ;;; | |
37 | ||
38 | (define %default-options | |
39 | ;; Alist of default option values. | |
40 | `((format . ,bytevector->nix-base32-string))) | |
41 | ||
42 | (define (show-help) | |
43 | (display (_ "Usage: guix hash [OPTION] FILE | |
44 | Return the cryptographic hash of FILE. | |
45 | ||
46 | Supported formats: 'nix-base32' (default), 'base32', and 'base16' | |
47 | ('hex' and 'hexadecimal' can be used as well).\n")) | |
48 | (format #t (_ " | |
49 | -f, --format=FMT write the hash in the given format")) | |
50 | (newline) | |
51 | (display (_ " | |
52 | -h, --help display this help and exit")) | |
53 | (display (_ " | |
54 | -V, --version display version information and exit")) | |
55 | (newline) | |
56 | (show-bug-report-information)) | |
57 | ||
58 | (define %options | |
59 | ;; Specification of the command-line options. | |
60 | (list (option '(#\f "format") #t #f | |
61 | (lambda (opt name arg result) | |
62 | (define fmt-proc | |
63 | (match arg | |
64 | ("nix-base32" | |
65 | bytevector->nix-base32-string) | |
66 | ("base32" | |
67 | bytevector->base32-string) | |
68 | ((or "base16" "hex" "hexadecimal") | |
69 | bytevector->base16-string) | |
70 | (x | |
71 | (leave (_ "unsupported hash format: ~a~%") | |
72 | arg)))) | |
73 | ||
74 | (alist-cons 'format fmt-proc | |
75 | (alist-delete 'format result)))) | |
76 | ||
77 | (option '(#\h "help") #f #f | |
78 | (lambda args | |
79 | (show-help) | |
80 | (exit 0))) | |
81 | (option '(#\V "version") #f #f | |
82 | (lambda args | |
83 | (show-version-and-exit "guix hash"))))) | |
84 | ||
85 | ||
86 | \f | |
87 | ;;; | |
88 | ;;; Entry point. | |
89 | ;;; | |
90 | ||
91 | (define (guix-hash . args) | |
92 | (define (parse-options) | |
93 | ;; Return the alist of option values. | |
a5975ced LC |
94 | (args-fold* args %options |
95 | (lambda (opt name arg result) | |
96 | (leave (_ "unrecognized option: ~a~%") | |
97 | name)) | |
98 | (lambda (arg result) | |
99 | (alist-cons 'argument arg result)) | |
100 | %default-options)) | |
6c365eca | 101 | |
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102 | (define (eof->null x) |
103 | (if (eof-object? x) | |
104 | #vu8() | |
105 | x)) | |
6c365eca | 106 | |
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107 | (let* ((opts (parse-options)) |
108 | (args (filter-map (match-lambda | |
109 | (('argument . value) | |
110 | value) | |
111 | (_ #f)) | |
112 | (reverse opts))) | |
113 | (fmt (assq-ref opts 'format))) | |
114 | ||
115 | (match args | |
116 | ((file) | |
117 | (catch 'system-error | |
118 | (lambda () | |
119 | (format #t "~a~%" | |
120 | (call-with-input-file file | |
121 | (compose fmt sha256 eof->null get-bytevector-all)))) | |
122 | (lambda args | |
123 | (leave (_ "~a~%") | |
124 | (strerror (system-error-errno args)))))) | |
125 | (_ | |
126 | (leave (_ "wrong number of arguments~%")))))) |