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
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
|
;;; GNU Guix --- Functional package management for GNU
;;; Copyright © 2014 Eric Bavier <bavier@member.fsf.org>
;;; Copyright © 2015 Mark H Weaver <mhw@netris.org>
;;; Copyright © 2016 Alex Sassmannshausen <alex@pompo.co>
;;;
;;; 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 import cpan)
#:use-module (ice-9 match)
#:use-module (ice-9 regex)
#:use-module ((ice-9 popen) #:select (open-pipe* close-pipe))
#:use-module ((ice-9 rdelim) #:select (read-line))
#:use-module (srfi srfi-1)
#:use-module (json)
#:use-module (guix hash)
#:use-module (guix store)
#:use-module (guix utils)
#:use-module (guix base32)
#:use-module ((guix download) #:select (download-to-store))
#:use-module (guix import utils)
#:use-module (guix import json)
#:use-module (guix packages)
#:use-module (guix derivations)
#:use-module (gnu packages perl)
#:export (cpan->guix-package))
;;; Commentary:
;;;
;;; Generate a package declaration template for the latest version of a CPAN
;;; module, using meta-data from metacpan.org.
;;;
;;; Code:
(define string->license
(match-lambda
;; List of valid values from https://metacpan.org/pod/CPAN::Meta::Spec.
;; Some licenses are excluded based on their absense from (guix licenses).
("agpl_3" 'agpl3)
;; apache_1_1
("apache_2_0" 'asl2.0)
;; artistic_1
("artistic_2" 'artistic2.0)
("bsd" 'bsd-3)
("freebsd" 'bsd-2)
;; gfdl_1_2
("gfdl_1_3" 'fdl1.3+)
("gpl_1" 'gpl1)
("gpl_2" 'gpl2)
("gpl_3" 'gpl3)
("lgpl_2_1" 'lgpl2.1)
("lgpl_3_0" 'lgpl3)
("mit" 'x11)
;; mozilla_1_0
("mozilla_1_1" 'mpl1.1)
("openssl" 'openssl)
("perl_5" '(package-license perl)) ;GPL1+ and Artistic 1
("qpl_1_0" 'qpl)
;; ssleay
;; sun
("zlib" 'zlib)
((x) (string->license x))
((lst ...) `(list ,@(map string->license lst)))
(_ #f)))
(define (module->name module)
"Transform a 'module' name into a 'release' name"
(regexp-substitute/global #f "::" module 'pre "-" 'post))
(define (module->dist-name module)
"Return the base distribution module for a given module. E.g. the 'ok'
module is distributed with 'Test::Simple', so (module->dist-name \"ok\") would
return \"Test-Simple\""
(assoc-ref (json-fetch (string-append "https://api.metacpan.org/module/"
module))
"distribution"))
(define (cpan-fetch module)
"Return an alist representation of the CPAN metadata for the perl module MODULE,
or #f on failure. MODULE should be e.g. \"Test::Script\""
;; This API always returns the latest release of the module.
(json-fetch (string-append "https://api.metacpan.org/release/"
;; XXX: The 'release' api requires the "release"
;; name of the package. This substitution seems
;; reasonably consistent across packages.
(module->name module))))
(define (cpan-home name)
(string-append "http://search.cpan.org/dist/" name))
(define (fix-source-url download-url)
"Return a new download URL based on DOWNLOAD-URL which now uses our mirrors,
if the original's domain was metacpan."
(regexp-substitute/global #f "http[s]?://cpan.metacpan.org" download-url
'pre "mirror://cpan" 'post))
(define %corelist
(delay
(let* ((perl (with-store store
(derivation->output-path
(package-derivation store perl))))
(core (string-append perl "/bin/corelist")))
(and (access? core X_OK)
core))))
(define (cpan-module->sexp meta)
"Return the `package' s-expression for a CPAN module from the metadata in
META."
(define name
(assoc-ref meta "distribution"))
(define (guix-name name)
(if (string-prefix? "perl-" name)
(string-downcase name)
(string-append "perl-" (string-downcase name))))
(define version
(match (assoc-ref meta "version")
((? number? vrs) (number->string vrs))
((? string? vrs) vrs)))
(define core-module?
(let ((perl-version (package-version perl))
(rx (make-regexp
(string-append "released with perl v?([0-9\\.]*)"
"(.*and removed from v?([0-9\\.]*))?"))))
(lambda (name)
(define (version-between? lower version upper)
(and (version>=? version lower)
(or (not upper)
(version>? upper version))))
(and (force %corelist)
(parameterize ((current-error-port (%make-void-port "w")))
(let* ((corelist (open-pipe* OPEN_READ (force %corelist) name)))
(let loop ()
(let ((line (read-line corelist)))
(if (eof-object? line)
(begin (close-pipe corelist) #f)
(or (and=> (regexp-exec rx line)
(lambda (m)
(let ((first (match:substring m 1))
(last (match:substring m 3)))
(version-between?
first perl-version last))))
(loop)))))))))))
(define (convert-inputs phases)
;; Convert phase dependencies into a list of name/variable pairs.
(match (flatten
(map (lambda (ph)
(filter-map (lambda (t)
(assoc-ref* meta "metadata" "prereqs" ph t))
'("requires" "recommends" "suggests")))
phases))
(#f
'())
((inputs ...)
(sort
(delete-duplicates
;; Listed dependencies may include core modules. Filter those out.
(filter-map (match-lambda
(("perl" . _) ;implicit dependency
#f)
((module . _)
(and (not (core-module? module))
(let ((name (guix-name (module->dist-name module))))
(list name
(list 'unquote (string->symbol name)))))))
inputs))
(lambda args
(match args
(((a _ ...) (b _ ...))
(string<? a b))))))))
(define (maybe-inputs guix-name inputs)
(match inputs
(()
'())
((inputs ...)
(list (list guix-name
(list 'quasiquote inputs))))))
(define source-url (fix-source-url (assoc-ref meta "download_url")))
(let ((tarball (with-store store
(download-to-store store source-url))))
`(package
(name ,(guix-name name))
(version ,version)
(source (origin
(method url-fetch)
(uri (string-append ,@(factorize-uri source-url version)))
(sha256
(base32
,(bytevector->nix-base32-string (file-sha256 tarball))))))
(build-system perl-build-system)
,@(maybe-inputs 'native-inputs
;; "runtime" may also be needed here. See
;; https://metacpan.org/pod/CPAN::Meta::Spec#Phases,
;; which says they are required during building. We
;; have not yet had a need for cross-compiled perl
;; modules, however, so we leave it out.
(convert-inputs '("configure" "build" "test")))
,@(maybe-inputs 'inputs
(convert-inputs '("runtime")))
(home-page ,(string-append "http://search.cpan.org/dist/" name))
(synopsis ,(assoc-ref meta "abstract"))
(description fill-in-yourself!)
(license ,(string->license (assoc-ref meta "license"))))))
(define (cpan->guix-package module-name)
"Fetch the metadata for PACKAGE-NAME from metacpan.org, and return the
`package' s-expression corresponding to that package, or #f on failure."
(let ((module-meta (cpan-fetch module-name)))
(and=> module-meta cpan-module->sexp)))
|