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
| | ;;; GNU Guix --- Functional package management for GNU
;;; Copyright © 2012, 2013, 2014, 2016, 2017 Ludovic Courtès <ludo@gnu.org>
;;; Copyright © 2013 Nikita Karetnikov <nikita@karetnikov.org>
;;; Copyright © 2016,2017 Jan Nieuwenhuizen <janneke@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 hash)
#:use-module (guix base32)
#:use-module (guix git)
#:use-module (guix hash)
#:use-module (guix serialization)
#:use-module (guix ui)
#:use-module (guix scripts)
#:use-module (guix base16)
#:use-module (ice-9 binary-ports)
#:use-module (rnrs files)
#: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)
#:export (guix-hash))
\f
;;;
;;; Command-line options.
;;;
(define %default-options
;; Alist of default option values.
`((format . ,bytevector->nix-base32-string)))
(define (show-help)
(display (G_ "Usage: guix hash [OPTION] FILE
Return the cryptographic hash of FILE.
Supported formats: 'nix-base32' (default), 'base32', and 'base16' ('hex'
and 'hexadecimal' can be used as well).\n"))
(format #t (G_ "
-x, --exclude-vcs exclude version control directories"))
(format #t (G_ "
-g, --git consider git files only"))
(format #t (G_ "
-f, --format=FMT write the hash in the given format"))
(format #t (G_ "
-r, --recursive compute the hash on FILE recursively"))
(newline)
(display (G_ "
-h, --help display this help and exit"))
(display (G_ "
-V, --version display version information and exit"))
(newline)
(show-bug-report-information))
(define %options
;; Specification of the command-line options.
(list (option '(#\x "exclude-vcs") #f #f
(lambda (opt name arg result)
(alist-cons 'exclude-vcs? #t result)))
(option '(#\g "git") #f #f
(lambda (opt name arg result)
(alist-cons 'git? #t result)))
(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 (G_ "unsupported hash format: ~a~%")
arg))))
(alist-cons 'format fmt-proc
(alist-delete 'format result))))
(option '(#\r "recursive") #f #f
(lambda (opt name arg result)
(alist-cons 'recursive? #t result)))
(option '(#\h "help") #f #f
(lambda args
(show-help)
(exit 0)))
(option '(#\V "version") #f #f
(lambda args
(show-version-and-exit "guix hash")))))
\f
;;;
;;; Entry point.
;;;
(define (guix-hash . args)
(define (parse-options)
;; Return the alist of option values.
(parse-command-line args %options (list %default-options)
#:build-options? #f))
(define (vcs-file? file stat)
(case (stat:type stat)
((directory)
(member (basename file) '(".bzr" ".git" ".hg" ".svn" "CVS")))
((regular)
;; Git sub-modules have a '.git' file that is a regular text file.
(string=? (basename file) ".git"))
(else
#f)))
(define (git-file? directory)
(let* ((files (git-ls-files directory))
(directories (delete-duplicates (map dirname files)))
(prefix (if (string-suffix? "/" directory) directory
(string-append directory "/")))
(prefix-length (string-length prefix)))
(lambda (file stat)
(case (stat:type stat)
((directory)
(member (string-drop file prefix-length) directories))
((regular)
(member (string-drop file prefix-length) files))
(else
#f)))))
(let* ((opts (parse-options))
(args (filter-map (match-lambda
(('argument . value)
value)
(_ #f))
(reverse opts)))
(fmt (assq-ref opts 'format))
(select? (cond
((assq-ref opts 'exclude-vcs?)
(negate vcs-file?))
((assq-ref opts 'git?)
(git-file? (car args)))
(else
(const #t)))))
(define (file-hash file)
;; Compute the hash of FILE.
;; Catch and gracefully report possible '&nar-error' conditions.
(with-error-handling
(if (assoc-ref opts 'recursive?)
(let-values (((port get-hash) (open-sha256-port)))
(write-file file port #:select? select?)
(force-output port)
(get-hash))
(match file
("-" (port-sha256 (current-input-port)))
(_ (call-with-input-file file port-sha256))))))
(match args
((file)
(catch 'system-error
(lambda ()
(format #t "~a~%" (fmt (file-hash file))))
(lambda args
(leave (G_ "~a~%")
(strerror (system-error-errno args))))))
(x
(leave (G_ "wrong number of arguments~%"))))))
|