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e3deeebb LC |
1 | ;;; Guix --- Nix package management from Guile. -*- coding: utf-8 -*- |
2 | ;;; Copyright (C) 2012 Ludovic Courtès <ludo@gnu.org> | |
3 | ;;; | |
4 | ;;; This file is part of Guix. | |
5 | ;;; | |
6 | ;;; Guix is free software; you can redistribute it and/or modify it | |
7 | ;;; under the terms of the GNU General Public License as published by | |
8 | ;;; the Free Software Foundation; either version 3 of the License, or (at | |
9 | ;;; your option) any later version. | |
10 | ;;; | |
11 | ;;; Guix is distributed in the hope that it will be useful, but | |
12 | ;;; WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | ;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | ;;; GNU General Public License for more details. | |
15 | ;;; | |
16 | ;;; You should have received a copy of the GNU General Public License | |
17 | ;;; along with Guix. If not, see <http://www.gnu.org/licenses/>. | |
18 | ||
19 | (define-module (guix utils) | |
00e219d1 | 20 | #:use-module (guix config) |
38b3122a | 21 | #:use-module (srfi srfi-1) |
72d86963 | 22 | #:use-module (srfi srfi-9) |
38b3122a | 23 | #:use-module (srfi srfi-26) |
de4c3f26 | 24 | #:use-module (srfi srfi-39) |
e3deeebb LC |
25 | #:use-module (srfi srfi-60) |
26 | #:use-module (rnrs bytevectors) | |
dba6b34b | 27 | #:use-module ((rnrs io ports) #:select (put-bytevector)) |
c8369cac | 28 | #:use-module (ice-9 vlist) |
38b3122a | 29 | #:use-module (ice-9 format) |
de4c3f26 LC |
30 | #:autoload (ice-9 popen) (open-pipe*) |
31 | #:autoload (ice-9 rdelim) (read-line) | |
98090557 | 32 | #:use-module (ice-9 regex) |
72d86963 | 33 | #:use-module (ice-9 match) |
8ef3401f | 34 | #:use-module (ice-9 format) |
39b9372c | 35 | #:autoload (system foreign) (pointer->procedure) |
ddc29a78 | 36 | #:export (bytevector->base16-string |
6d800a80 | 37 | base16-string->bytevector |
de4c3f26 LC |
38 | sha256 |
39 | ||
40 | %nixpkgs-directory | |
41 | nixpkgs-derivation | |
ce5d658c | 42 | nixpkgs-derivation* |
de4c3f26 | 43 | |
72d86963 | 44 | define-record-type* |
900f7267 | 45 | compile-time-value |
98090557 | 46 | memoize |
0af2c24e LC |
47 | default-keyword-arguments |
48 | substitute-keyword-arguments | |
ff352cfb | 49 | |
64fc89b6 | 50 | <location> |
ff352cfb LC |
51 | location |
52 | location? | |
53 | location-file | |
54 | location-line | |
55 | location-column | |
56 | source-properties->location | |
57 | ||
98090557 | 58 | gnu-triplet->nix-system |
9b48fb88 LC |
59 | %current-system |
60 | package-name->name+version)) | |
e3deeebb | 61 | |
38b3122a | 62 | \f |
dba6b34b LC |
63 | ;;; |
64 | ;;; Compile-time computations. | |
65 | ;;; | |
66 | ||
67 | (define-syntax compile-time-value | |
68 | (syntax-rules () | |
69 | "Evaluate the given expression at compile time. The expression must | |
70 | evaluate to a simple datum." | |
71 | ((_ exp) | |
72 | (let-syntax ((v (lambda (s) | |
73 | (let ((val exp)) | |
74 | (syntax-case s () | |
75 | (_ #`'#,(datum->syntax s val))))))) | |
76 | v)))) | |
77 | ||
78 | \f | |
38b3122a LC |
79 | ;;; |
80 | ;;; Base 16. | |
81 | ;;; | |
82 | ||
83 | (define (bytevector->base16-string bv) | |
84 | "Return the hexadecimal representation of BV's contents." | |
85 | (define len | |
86 | (bytevector-length bv)) | |
87 | ||
88 | (let-syntax ((base16-chars (lambda (s) | |
89 | (syntax-case s () | |
90 | (_ | |
91 | (let ((v (list->vector | |
92 | (unfold (cut > <> 255) | |
93 | (lambda (n) | |
94 | (format #f "~2,'0x" n)) | |
95 | 1+ | |
96 | 0)))) | |
97 | v)))))) | |
98 | (define chars base16-chars) | |
99 | (let loop ((i 0) | |
100 | (r '())) | |
101 | (if (= i len) | |
102 | (string-concatenate-reverse r) | |
103 | (loop (+ 1 i) | |
104 | (cons (vector-ref chars (bytevector-u8-ref bv i)) r)))))) | |
105 | ||
6d800a80 LC |
106 | (define base16-string->bytevector |
107 | (let ((chars->value (fold (lambda (i r) | |
108 | (vhash-consv (string-ref (number->string i 16) | |
109 | 0) | |
110 | i r)) | |
111 | vlist-null | |
112 | (iota 16)))) | |
113 | (lambda (s) | |
114 | "Return the bytevector whose hexadecimal representation is string S." | |
115 | (define bv | |
116 | (make-bytevector (quotient (string-length s) 2) 0)) | |
117 | ||
118 | (string-fold (lambda (chr i) | |
119 | (let ((j (quotient i 2)) | |
120 | (v (and=> (vhash-assv chr chars->value) cdr))) | |
121 | (if v | |
122 | (if (zero? (logand i 1)) | |
123 | (bytevector-u8-set! bv j | |
124 | (arithmetic-shift v 4)) | |
125 | (let ((w (bytevector-u8-ref bv j))) | |
126 | (bytevector-u8-set! bv j (logior v w)))) | |
127 | (error "invalid hexadecimal character" chr))) | |
128 | (+ i 1)) | |
129 | 0 | |
130 | s) | |
131 | bv))) | |
132 | ||
d0a92b75 LC |
133 | \f |
134 | ;;; | |
135 | ;;; Hash. | |
136 | ;;; | |
137 | ||
39b9372c | 138 | (define sha256 |
d388c2c4 LC |
139 | (let ((hash (pointer->procedure void |
140 | (dynamic-func "gcry_md_hash_buffer" | |
141 | (dynamic-link %libgcrypt)) | |
142 | `(,int * * ,size_t))) | |
143 | (sha256 8)) ; GCRY_MD_SHA256, as of 1.5.0 | |
39b9372c LC |
144 | (lambda (bv) |
145 | "Return the SHA256 of BV as a bytevector." | |
d388c2c4 LC |
146 | (let ((digest (make-bytevector (/ 256 8)))) |
147 | (hash sha256 (bytevector->pointer digest) | |
148 | (bytevector->pointer bv) (bytevector-length bv)) | |
149 | digest)))) | |
de4c3f26 LC |
150 | |
151 | \f | |
152 | ;;; | |
153 | ;;; Nixpkgs. | |
154 | ;;; | |
155 | ||
156 | (define %nixpkgs-directory | |
900f7267 LC |
157 | (make-parameter |
158 | ;; Capture the build-time value of $NIXPKGS. | |
a09ec3a5 LC |
159 | (or %nixpkgs |
160 | (and=> (getenv "NIXPKGS") | |
161 | (lambda (val) | |
162 | ;; Bail out when passed an empty string, otherwise | |
163 | ;; `nix-instantiate' will sit there and attempt to read | |
164 | ;; from its standard input. | |
165 | (if (string=? val "") | |
166 | #f | |
167 | val)))))) | |
de4c3f26 | 168 | |
fbc93bed | 169 | (define* (nixpkgs-derivation attribute #:optional (system (%current-system))) |
de4c3f26 | 170 | "Return the derivation path of ATTRIBUTE in Nixpkgs." |
b86b0056 | 171 | (let* ((p (open-pipe* OPEN_READ (or (getenv "NIX_INSTANTIATE") |
00e219d1 | 172 | %nix-instantiate) |
fbc93bed LC |
173 | "-A" attribute (%nixpkgs-directory) |
174 | "--argstr" "system" system)) | |
de4c3f26 LC |
175 | (l (read-line p)) |
176 | (s (close-pipe p))) | |
177 | (and (zero? (status:exit-val s)) | |
178 | (not (eof-object? l)) | |
179 | l))) | |
180 | ||
ce5d658c LC |
181 | (define-syntax-rule (nixpkgs-derivation* attribute) |
182 | "Evaluate the given Nixpkgs derivation at compile-time." | |
183 | (compile-time-value (nixpkgs-derivation attribute))) | |
184 | ||
de4c3f26 LC |
185 | \f |
186 | ;;; | |
187 | ;;; Miscellaneous. | |
188 | ;;; | |
189 | ||
72d86963 LC |
190 | (define-syntax define-record-type* |
191 | (lambda (s) | |
192 | "Define the given record type such that an additional \"syntactic | |
193 | constructor\" is defined, which allows instances to be constructed with named | |
194 | field initializers, à la SRFI-35, as well as default values." | |
dcd60f43 LC |
195 | (define (make-syntactic-constructor type name ctor fields defaults) |
196 | "Make the syntactic constructor NAME for TYPE, that calls CTOR, and | |
197 | expects all of FIELDS to be initialized. DEFAULTS is the list of | |
198 | FIELD/DEFAULT-VALUE tuples." | |
199 | (with-syntax ((type type) | |
200 | (name name) | |
72d86963 LC |
201 | (ctor ctor) |
202 | (expected fields) | |
203 | (defaults defaults)) | |
dcd60f43 | 204 | #`(define-syntax name |
72d86963 | 205 | (lambda (s) |
dcd60f43 LC |
206 | (define (record-inheritance orig-record field+value) |
207 | ;; Produce code that returns a record identical to | |
208 | ;; ORIG-RECORD, except that values for the FIELD+VALUE alist | |
209 | ;; prevail. | |
210 | (define (field-inherited-value f) | |
211 | (and=> (find (lambda (x) | |
212 | (eq? f (car (syntax->datum x)))) | |
213 | field+value) | |
214 | car)) | |
215 | ||
216 | #`(make-struct type 0 | |
217 | #,@(map (lambda (field index) | |
218 | (or (field-inherited-value field) | |
219 | #`(struct-ref #,orig-record | |
220 | #,index))) | |
221 | 'expected | |
222 | (iota (length 'expected))))) | |
223 | ||
224 | ||
225 | (syntax-case s (inherit #,@fields) | |
226 | ((_ (inherit orig-record) (field value) (... ...)) | |
227 | #`(letrec* ((field value) (... ...)) | |
228 | #,(record-inheritance #'orig-record | |
229 | #'((field value) (... ...))))) | |
72d86963 | 230 | ((_ (field value) (... ...)) |
8fd5bd2b LC |
231 | (let ((fields (map syntax->datum #'(field (... ...)))) |
232 | (dflt (map (match-lambda | |
233 | ((f v) | |
234 | (list (syntax->datum f) v))) | |
235 | #'defaults))) | |
236 | ||
dcd60f43 LC |
237 | (define (field-value f) |
238 | (or (and=> (find (lambda (x) | |
239 | (eq? f (car (syntax->datum x)))) | |
240 | #'((field value) (... ...))) | |
241 | car) | |
242 | (car (assoc-ref dflt (syntax->datum f))))) | |
72d86963 | 243 | |
8ef3401f LC |
244 | (let-syntax ((error* |
245 | (syntax-rules () | |
246 | ((_ fmt args (... ...)) | |
247 | (syntax-violation 'name | |
248 | (format #f fmt args | |
249 | (... ...)) | |
250 | s))))) | |
251 | (let ((fields (append fields (map car dflt)))) | |
252 | (cond ((lset= eq? fields 'expected) | |
8fd5bd2b LC |
253 | #`(letrec* ((field value) (... ...)) |
254 | (ctor #,@(map field-value 'expected)))) | |
8ef3401f LC |
255 | ((pair? (lset-difference eq? fields 'expected)) |
256 | (error* "extraneous field initializers ~a" | |
257 | (lset-difference eq? fields 'expected))) | |
258 | (else | |
259 | (error* "missing field initializers ~a" | |
260 | (lset-difference eq? 'expected | |
261 | fields))))))))))))) | |
72d86963 LC |
262 | |
263 | (define (field-default-value s) | |
264 | (syntax-case s (default) | |
265 | ((field (default val) _ ...) | |
266 | (list #'field #'val)) | |
267 | ((field _ options ...) | |
268 | (field-default-value #'(field options ...))) | |
269 | (_ #f))) | |
270 | ||
271 | (syntax-case s () | |
272 | ((_ type syntactic-ctor ctor pred | |
273 | (field get options ...) ...) | |
274 | #`(begin | |
275 | (define-record-type type | |
276 | (ctor field ...) | |
277 | pred | |
278 | (field get) ...) | |
dcd60f43 | 279 | #,(make-syntactic-constructor #'type #'syntactic-ctor #'ctor |
72d86963 LC |
280 | #'(field ...) |
281 | (filter-map field-default-value | |
282 | #'((field options ...) | |
283 | ...)))))))) | |
284 | ||
de4c3f26 LC |
285 | (define (memoize proc) |
286 | "Return a memoizing version of PROC." | |
287 | (let ((cache (make-hash-table))) | |
288 | (lambda args | |
289 | (let ((results (hash-ref cache args))) | |
290 | (if results | |
291 | (apply values results) | |
292 | (let ((results (call-with-values (lambda () | |
293 | (apply proc args)) | |
294 | list))) | |
295 | (hash-set! cache args results) | |
296 | (apply values results))))))) | |
98090557 | 297 | |
0af2c24e LC |
298 | (define (default-keyword-arguments args defaults) |
299 | "Return ARGS augmented with any keyword/value from DEFAULTS for | |
300 | keywords not already present in ARGS." | |
301 | (let loop ((defaults defaults) | |
302 | (args args)) | |
303 | (match defaults | |
304 | ((kw value rest ...) | |
305 | (loop rest | |
306 | (if (assoc-ref kw args) | |
307 | args | |
308 | (cons* kw value args)))) | |
309 | (() | |
310 | args)))) | |
311 | ||
312 | (define-syntax substitute-keyword-arguments | |
313 | (syntax-rules () | |
314 | "Return a new list of arguments where the value for keyword arg KW is | |
315 | replaced by EXP. EXP is evaluated in a context where VAR is boud to the | |
316 | previous value of the keyword argument." | |
317 | ((_ original-args ((kw var) exp) ...) | |
318 | (let loop ((args original-args) | |
319 | (before '())) | |
320 | (match args | |
321 | ((kw var rest (... ...)) | |
322 | (loop rest (cons* exp kw before))) | |
323 | ... | |
324 | ((x rest (... ...)) | |
325 | (loop rest (cons x before))) | |
326 | (() | |
327 | (reverse before))))))) | |
328 | ||
98090557 LC |
329 | (define (gnu-triplet->nix-system triplet) |
330 | "Return the Nix system type corresponding to TRIPLET, a GNU triplet as | |
331 | returned by `config.guess'." | |
332 | (let ((triplet (cond ((string-match "^i[345]86-(.*)$" triplet) | |
333 | => | |
334 | (lambda (m) | |
335 | (string-append "i686-" (match:substring m 1)))) | |
336 | (else triplet)))) | |
337 | (cond ((string-match "^([^-]+)-([^-]+-)?linux-gnu.*" triplet) | |
338 | => | |
339 | (lambda (m) | |
340 | ;; Nix omits `-gnu' for GNU/Linux. | |
341 | (string-append (match:substring m 1) "-linux"))) | |
342 | ((string-match "^([^-]+)-([^-]+-)?([[:alpha:]]+)([0-9]+\\.?)*$" triplet) | |
343 | => | |
344 | (lambda (m) | |
345 | ;; Nix strip the version number from names such as `gnu0.3', | |
346 | ;; `darwin10.2.0', etc., and always strips the vendor part. | |
347 | (string-append (match:substring m 1) "-" | |
348 | (match:substring m 3)))) | |
349 | (else triplet)))) | |
350 | ||
351 | (define %current-system | |
352 | ;; System type as expected by Nix, usually ARCHITECTURE-KERNEL. | |
d8eea3d2 LC |
353 | ;; By default, this is equal to (gnu-triplet->nix-system %host-type). |
354 | (make-parameter %system)) | |
ff352cfb | 355 | |
9b48fb88 LC |
356 | (define (package-name->name+version name) |
357 | "Given NAME, a package name like \"foo-0.9.1b\", return two values: | |
358 | \"foo\" and \"0.9.1b\". When the version part is unavailable, NAME and | |
359 | #f are returned. The first hyphen followed by a digit is considered to | |
360 | introduce the version part." | |
361 | ;; See also `DrvName' in Nix. | |
362 | ||
363 | (define number? | |
364 | (cut char-set-contains? char-set:digit <>)) | |
365 | ||
366 | (let loop ((chars (string->list name)) | |
367 | (prefix '())) | |
368 | (match chars | |
369 | (() | |
370 | (values name #f)) | |
371 | ((#\- (? number? n) rest ...) | |
372 | (values (list->string (reverse prefix)) | |
373 | (list->string (cons n rest)))) | |
374 | ((head tail ...) | |
375 | (loop tail (cons head prefix)))))) | |
376 | ||
ff352cfb LC |
377 | \f |
378 | ;;; | |
379 | ;;; Source location. | |
380 | ;;; | |
381 | ||
382 | ;; A source location. | |
383 | (define-record-type <location> | |
384 | (make-location file line column) | |
385 | location? | |
386 | (file location-file) ; file name | |
387 | (line location-line) ; 1-indexed line | |
388 | (column location-column)) ; 0-indexed column | |
389 | ||
390 | (define location | |
391 | (memoize | |
392 | (lambda (file line column) | |
393 | "Return the <location> object for the given FILE, LINE, and COLUMN." | |
394 | (and line column file | |
395 | (make-location file line column))))) | |
396 | ||
397 | (define (source-properties->location loc) | |
398 | "Return a location object based on the info in LOC, an alist as returned | |
399 | by Guile's `source-properties', `frame-source', `current-source-location', | |
400 | etc." | |
401 | (let ((file (assq-ref loc 'filename)) | |
402 | (line (assq-ref loc 'line)) | |
403 | (col (assq-ref loc 'column))) | |
5e6c9012 LC |
404 | ;; In accordance with the GCS, start line and column numbers at 1. |
405 | (location file (and line (+ line 1)) (and col (+ col 1))))) |