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233e7676 | 1 | ;;; GNU Guix --- Functional package management for GNU |
bbb7a00e | 2 | ;;; Copyright © 2012, 2013 Ludovic Courtès <ludo@gnu.org> |
e3deeebb | 3 | ;;; |
233e7676 | 4 | ;;; This file is part of GNU Guix. |
e3deeebb | 5 | ;;; |
233e7676 | 6 | ;;; GNU Guix is free software; you can redistribute it and/or modify it |
e3deeebb LC |
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 | ;;; | |
233e7676 | 11 | ;;; GNU Guix is distributed in the hope that it will be useful, but |
e3deeebb LC |
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 | |
233e7676 | 17 | ;;; along with GNU Guix. If not, see <http://www.gnu.org/licenses/>. |
e3deeebb LC |
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)) |
e0fbbc88 | 28 | #:use-module ((guix build utils) #:select (dump-port)) |
c8369cac | 29 | #:use-module (ice-9 vlist) |
38b3122a | 30 | #:use-module (ice-9 format) |
de4c3f26 LC |
31 | #:autoload (ice-9 popen) (open-pipe*) |
32 | #:autoload (ice-9 rdelim) (read-line) | |
98090557 | 33 | #:use-module (ice-9 regex) |
72d86963 | 34 | #:use-module (ice-9 match) |
8ef3401f | 35 | #:use-module (ice-9 format) |
39b9372c | 36 | #:autoload (system foreign) (pointer->procedure) |
ddc29a78 | 37 | #:export (bytevector->base16-string |
6d800a80 | 38 | base16-string->bytevector |
de4c3f26 LC |
39 | |
40 | %nixpkgs-directory | |
41 | nixpkgs-derivation | |
ce5d658c | 42 | nixpkgs-derivation* |
de4c3f26 | 43 | |
900f7267 | 44 | compile-time-value |
98090557 | 45 | memoize |
0af2c24e LC |
46 | default-keyword-arguments |
47 | substitute-keyword-arguments | |
ff352cfb | 48 | |
64fc89b6 | 49 | <location> |
ff352cfb LC |
50 | location |
51 | location? | |
52 | location-file | |
53 | location-line | |
54 | location-column | |
55 | source-properties->location | |
56 | ||
98090557 | 57 | gnu-triplet->nix-system |
9b48fb88 | 58 | %current-system |
9c1edabd | 59 | %current-target-system |
0d1e6ce4 MW |
60 | version-compare |
61 | version>? | |
04fd96ca | 62 | package-name->name+version |
2bcfb9e0 | 63 | string-tokenize* |
0fdd3bea | 64 | file-extension |
861693f3 | 65 | call-with-temporary-output-file |
e0fbbc88 LC |
66 | fold2 |
67 | filtered-port)) | |
e3deeebb | 68 | |
38b3122a | 69 | \f |
dba6b34b LC |
70 | ;;; |
71 | ;;; Compile-time computations. | |
72 | ;;; | |
73 | ||
74 | (define-syntax compile-time-value | |
75 | (syntax-rules () | |
76 | "Evaluate the given expression at compile time. The expression must | |
77 | evaluate to a simple datum." | |
78 | ((_ exp) | |
79 | (let-syntax ((v (lambda (s) | |
80 | (let ((val exp)) | |
81 | (syntax-case s () | |
82 | (_ #`'#,(datum->syntax s val))))))) | |
83 | v)))) | |
84 | ||
85 | \f | |
38b3122a LC |
86 | ;;; |
87 | ;;; Base 16. | |
88 | ;;; | |
89 | ||
90 | (define (bytevector->base16-string bv) | |
91 | "Return the hexadecimal representation of BV's contents." | |
92 | (define len | |
93 | (bytevector-length bv)) | |
94 | ||
95 | (let-syntax ((base16-chars (lambda (s) | |
96 | (syntax-case s () | |
97 | (_ | |
98 | (let ((v (list->vector | |
99 | (unfold (cut > <> 255) | |
100 | (lambda (n) | |
101 | (format #f "~2,'0x" n)) | |
102 | 1+ | |
103 | 0)))) | |
104 | v)))))) | |
105 | (define chars base16-chars) | |
106 | (let loop ((i 0) | |
107 | (r '())) | |
108 | (if (= i len) | |
109 | (string-concatenate-reverse r) | |
110 | (loop (+ 1 i) | |
111 | (cons (vector-ref chars (bytevector-u8-ref bv i)) r)))))) | |
112 | ||
6d800a80 LC |
113 | (define base16-string->bytevector |
114 | (let ((chars->value (fold (lambda (i r) | |
115 | (vhash-consv (string-ref (number->string i 16) | |
116 | 0) | |
117 | i r)) | |
118 | vlist-null | |
119 | (iota 16)))) | |
120 | (lambda (s) | |
121 | "Return the bytevector whose hexadecimal representation is string S." | |
122 | (define bv | |
123 | (make-bytevector (quotient (string-length s) 2) 0)) | |
124 | ||
125 | (string-fold (lambda (chr i) | |
126 | (let ((j (quotient i 2)) | |
127 | (v (and=> (vhash-assv chr chars->value) cdr))) | |
128 | (if v | |
129 | (if (zero? (logand i 1)) | |
130 | (bytevector-u8-set! bv j | |
131 | (arithmetic-shift v 4)) | |
132 | (let ((w (bytevector-u8-ref bv j))) | |
133 | (bytevector-u8-set! bv j (logior v w)))) | |
134 | (error "invalid hexadecimal character" chr))) | |
135 | (+ i 1)) | |
136 | 0 | |
137 | s) | |
138 | bv))) | |
139 | ||
de4c3f26 LC |
140 | |
141 | \f | |
e0fbbc88 LC |
142 | ;;; |
143 | ;;; Filtering & pipes. | |
144 | ;;; | |
145 | ||
146 | (define (filtered-port command input) | |
147 | "Return an input port where data drained from INPUT is filtered through | |
148 | COMMAND (a list). In addition, return a list of PIDs that the caller must | |
101d9f3f LC |
149 | wait. When INPUT is a file port, it must be unbuffered; otherwise, any |
150 | buffered data is lost." | |
e0fbbc88 LC |
151 | (let loop ((input input) |
152 | (pids '())) | |
153 | (if (file-port? input) | |
154 | (match (pipe) | |
155 | ((in . out) | |
156 | (match (primitive-fork) | |
157 | (0 | |
158 | (close-port in) | |
159 | (close-port (current-input-port)) | |
160 | (dup2 (fileno input) 0) | |
161 | (close-port (current-output-port)) | |
162 | (dup2 (fileno out) 1) | |
163 | (apply execl (car command) command)) | |
164 | (child | |
165 | (close-port out) | |
166 | (values in (cons child pids)))))) | |
167 | ||
168 | ;; INPUT is not a file port, so fork just for the sake of tunneling it | |
169 | ;; through a file port. | |
170 | (match (pipe) | |
171 | ((in . out) | |
172 | (match (primitive-fork) | |
173 | (0 | |
174 | (dynamic-wind | |
175 | (const #t) | |
176 | (lambda () | |
177 | (close-port in) | |
178 | (dump-port input out)) | |
179 | (lambda () | |
180 | (false-if-exception (close out)) | |
181 | (primitive-exit 0)))) | |
182 | (child | |
183 | (close-port out) | |
184 | (loop in (cons child pids))))))))) | |
185 | ||
186 | \f | |
de4c3f26 LC |
187 | ;;; |
188 | ;;; Nixpkgs. | |
189 | ;;; | |
190 | ||
191 | (define %nixpkgs-directory | |
900f7267 LC |
192 | (make-parameter |
193 | ;; Capture the build-time value of $NIXPKGS. | |
a09ec3a5 LC |
194 | (or %nixpkgs |
195 | (and=> (getenv "NIXPKGS") | |
196 | (lambda (val) | |
197 | ;; Bail out when passed an empty string, otherwise | |
198 | ;; `nix-instantiate' will sit there and attempt to read | |
199 | ;; from its standard input. | |
200 | (if (string=? val "") | |
201 | #f | |
202 | val)))))) | |
de4c3f26 | 203 | |
fbc93bed | 204 | (define* (nixpkgs-derivation attribute #:optional (system (%current-system))) |
de4c3f26 | 205 | "Return the derivation path of ATTRIBUTE in Nixpkgs." |
b86b0056 | 206 | (let* ((p (open-pipe* OPEN_READ (or (getenv "NIX_INSTANTIATE") |
00e219d1 | 207 | %nix-instantiate) |
fbc93bed LC |
208 | "-A" attribute (%nixpkgs-directory) |
209 | "--argstr" "system" system)) | |
de4c3f26 LC |
210 | (l (read-line p)) |
211 | (s (close-pipe p))) | |
212 | (and (zero? (status:exit-val s)) | |
213 | (not (eof-object? l)) | |
214 | l))) | |
215 | ||
ce5d658c LC |
216 | (define-syntax-rule (nixpkgs-derivation* attribute) |
217 | "Evaluate the given Nixpkgs derivation at compile-time." | |
218 | (compile-time-value (nixpkgs-derivation attribute))) | |
219 | ||
de4c3f26 LC |
220 | \f |
221 | ;;; | |
222 | ;;; Miscellaneous. | |
223 | ;;; | |
224 | ||
225 | (define (memoize proc) | |
226 | "Return a memoizing version of PROC." | |
227 | (let ((cache (make-hash-table))) | |
228 | (lambda args | |
229 | (let ((results (hash-ref cache args))) | |
230 | (if results | |
231 | (apply values results) | |
232 | (let ((results (call-with-values (lambda () | |
233 | (apply proc args)) | |
234 | list))) | |
235 | (hash-set! cache args results) | |
236 | (apply values results))))))) | |
98090557 | 237 | |
0af2c24e LC |
238 | (define (default-keyword-arguments args defaults) |
239 | "Return ARGS augmented with any keyword/value from DEFAULTS for | |
240 | keywords not already present in ARGS." | |
241 | (let loop ((defaults defaults) | |
242 | (args args)) | |
243 | (match defaults | |
244 | ((kw value rest ...) | |
245 | (loop rest | |
246 | (if (assoc-ref kw args) | |
247 | args | |
248 | (cons* kw value args)))) | |
249 | (() | |
250 | args)))) | |
251 | ||
252 | (define-syntax substitute-keyword-arguments | |
253 | (syntax-rules () | |
254 | "Return a new list of arguments where the value for keyword arg KW is | |
255 | replaced by EXP. EXP is evaluated in a context where VAR is boud to the | |
256 | previous value of the keyword argument." | |
257 | ((_ original-args ((kw var) exp) ...) | |
258 | (let loop ((args original-args) | |
259 | (before '())) | |
260 | (match args | |
261 | ((kw var rest (... ...)) | |
262 | (loop rest (cons* exp kw before))) | |
263 | ... | |
264 | ((x rest (... ...)) | |
265 | (loop rest (cons x before))) | |
266 | (() | |
267 | (reverse before))))))) | |
268 | ||
98090557 LC |
269 | (define (gnu-triplet->nix-system triplet) |
270 | "Return the Nix system type corresponding to TRIPLET, a GNU triplet as | |
271 | returned by `config.guess'." | |
272 | (let ((triplet (cond ((string-match "^i[345]86-(.*)$" triplet) | |
273 | => | |
274 | (lambda (m) | |
275 | (string-append "i686-" (match:substring m 1)))) | |
276 | (else triplet)))) | |
277 | (cond ((string-match "^([^-]+)-([^-]+-)?linux-gnu.*" triplet) | |
278 | => | |
279 | (lambda (m) | |
280 | ;; Nix omits `-gnu' for GNU/Linux. | |
281 | (string-append (match:substring m 1) "-linux"))) | |
282 | ((string-match "^([^-]+)-([^-]+-)?([[:alpha:]]+)([0-9]+\\.?)*$" triplet) | |
283 | => | |
284 | (lambda (m) | |
285 | ;; Nix strip the version number from names such as `gnu0.3', | |
286 | ;; `darwin10.2.0', etc., and always strips the vendor part. | |
287 | (string-append (match:substring m 1) "-" | |
288 | (match:substring m 3)))) | |
289 | (else triplet)))) | |
290 | ||
291 | (define %current-system | |
292 | ;; System type as expected by Nix, usually ARCHITECTURE-KERNEL. | |
d8eea3d2 LC |
293 | ;; By default, this is equal to (gnu-triplet->nix-system %host-type). |
294 | (make-parameter %system)) | |
ff352cfb | 295 | |
9c1edabd LC |
296 | (define %current-target-system |
297 | ;; Either #f or a GNU triplet representing the target system we are | |
298 | ;; cross-building to. | |
299 | (make-parameter #f)) | |
300 | ||
0d1e6ce4 MW |
301 | (define version-compare |
302 | (let ((strverscmp | |
303 | (let ((sym (or (dynamic-func "strverscmp" (dynamic-link)) | |
304 | (error "could not find `strverscmp' (from GNU libc)")))) | |
305 | (pointer->procedure int sym (list '* '*))))) | |
306 | (lambda (a b) | |
307 | "Return '> when A denotes a newer version than B, | |
308 | '< when A denotes a older version than B, | |
309 | or '= when they denote equal versions." | |
310 | (let ((result (strverscmp (string->pointer a) (string->pointer b)))) | |
311 | (cond ((positive? result) '>) | |
312 | ((negative? result) '<) | |
313 | (else '=)))))) | |
314 | ||
315 | (define (version>? a b) | |
316 | "Return #t when A denotes a newer version than B." | |
317 | (eq? '> (version-compare a b))) | |
318 | ||
9b48fb88 LC |
319 | (define (package-name->name+version name) |
320 | "Given NAME, a package name like \"foo-0.9.1b\", return two values: | |
321 | \"foo\" and \"0.9.1b\". When the version part is unavailable, NAME and | |
322 | #f are returned. The first hyphen followed by a digit is considered to | |
323 | introduce the version part." | |
324 | ;; See also `DrvName' in Nix. | |
325 | ||
326 | (define number? | |
327 | (cut char-set-contains? char-set:digit <>)) | |
328 | ||
329 | (let loop ((chars (string->list name)) | |
330 | (prefix '())) | |
331 | (match chars | |
332 | (() | |
333 | (values name #f)) | |
334 | ((#\- (? number? n) rest ...) | |
335 | (values (list->string (reverse prefix)) | |
336 | (list->string (cons n rest)))) | |
337 | ((head tail ...) | |
338 | (loop tail (cons head prefix)))))) | |
339 | ||
0fdd3bea LC |
340 | (define (file-extension file) |
341 | "Return the extension of FILE or #f if there is none." | |
342 | (let ((dot (string-rindex file #\.))) | |
343 | (and dot (substring file (+ 1 dot) (string-length file))))) | |
344 | ||
2bcfb9e0 LC |
345 | (define (string-tokenize* string separator) |
346 | "Return the list of substrings of STRING separated by SEPARATOR. This is | |
347 | like `string-tokenize', but SEPARATOR is a string." | |
348 | (define (index string what) | |
349 | (let loop ((string string) | |
350 | (offset 0)) | |
351 | (cond ((string-null? string) | |
352 | #f) | |
353 | ((string-prefix? what string) | |
354 | offset) | |
355 | (else | |
356 | (loop (string-drop string 1) (+ 1 offset)))))) | |
357 | ||
358 | (define len | |
359 | (string-length separator)) | |
360 | ||
361 | (let loop ((string string) | |
362 | (result '())) | |
363 | (cond ((index string separator) | |
364 | => | |
365 | (lambda (offset) | |
366 | (loop (string-drop string (+ offset len)) | |
367 | (cons (substring string 0 offset) | |
368 | result)))) | |
369 | (else | |
370 | (reverse (cons string result)))))) | |
371 | ||
861693f3 LC |
372 | (define (call-with-temporary-output-file proc) |
373 | "Call PROC with a name of a temporary file and open output port to that | |
374 | file; close the file and delete it when leaving the dynamic extent of this | |
375 | call." | |
376 | (let* ((template (string-copy "guix-file.XXXXXX")) | |
377 | (out (mkstemp! template))) | |
378 | (dynamic-wind | |
379 | (lambda () | |
380 | #t) | |
381 | (lambda () | |
382 | (proc template out)) | |
383 | (lambda () | |
384 | (false-if-exception (close out)) | |
385 | (false-if-exception (delete-file template)))))) | |
386 | ||
04fd96ca LC |
387 | (define fold2 |
388 | (case-lambda | |
389 | ((proc seed1 seed2 lst) | |
390 | "Like `fold', but with a single list and two seeds." | |
391 | (let loop ((result1 seed1) | |
392 | (result2 seed2) | |
393 | (lst lst)) | |
394 | (if (null? lst) | |
395 | (values result1 result2) | |
396 | (call-with-values | |
397 | (lambda () (proc (car lst) result1 result2)) | |
398 | (lambda (result1 result2) | |
399 | (loop result1 result2 (cdr lst))))))) | |
400 | ((proc seed1 seed2 lst1 lst2) | |
401 | "Like `fold', but with a two lists and two seeds." | |
402 | (let loop ((result1 seed1) | |
403 | (result2 seed2) | |
404 | (lst1 lst1) | |
405 | (lst2 lst2)) | |
406 | (if (or (null? lst1) (null? lst2)) | |
407 | (values result1 result2) | |
408 | (call-with-values | |
409 | (lambda () (proc (car lst1) (car lst2) result1 result2)) | |
410 | (lambda (result1 result2) | |
411 | (fold2 proc result1 result2 (cdr lst1) (cdr lst2))))))))) | |
412 | ||
ff352cfb LC |
413 | \f |
414 | ;;; | |
415 | ;;; Source location. | |
416 | ;;; | |
417 | ||
418 | ;; A source location. | |
419 | (define-record-type <location> | |
420 | (make-location file line column) | |
421 | location? | |
422 | (file location-file) ; file name | |
423 | (line location-line) ; 1-indexed line | |
424 | (column location-column)) ; 0-indexed column | |
425 | ||
426 | (define location | |
427 | (memoize | |
428 | (lambda (file line column) | |
429 | "Return the <location> object for the given FILE, LINE, and COLUMN." | |
430 | (and line column file | |
431 | (make-location file line column))))) | |
432 | ||
433 | (define (source-properties->location loc) | |
434 | "Return a location object based on the info in LOC, an alist as returned | |
435 | by Guile's `source-properties', `frame-source', `current-source-location', | |
436 | etc." | |
437 | (let ((file (assq-ref loc 'filename)) | |
438 | (line (assq-ref loc 'line)) | |
439 | (col (assq-ref loc 'column))) | |
5fe21fbe LC |
440 | ;; In accordance with the GCS, start line and column numbers at 1. Note |
441 | ;; that unlike LINE and `port-column', COL is actually 1-indexed here... | |
442 | (location file (and line (+ line 1)) col))) |