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9eb977db KS |
1 | /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/ |
2 | ||
3 | /*** | |
4 | This file is part of systemd. | |
5 | ||
6 | Copyright 2010-2012 Lennart Poettering | |
7 | ||
8 | systemd is free software; you can redistribute it and/or modify it | |
9 | under the terms of the GNU Lesser General Public License as published by | |
10 | the Free Software Foundation; either version 2.1 of the License, or | |
11 | (at your option) any later version. | |
12 | ||
13 | systemd is distributed in the hope that it will be useful, but | |
14 | WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
16 | Lesser General Public License for more details. | |
17 | ||
18 | You should have received a copy of the GNU Lesser General Public License | |
19 | along with systemd; If not, see <http://www.gnu.org/licenses/>. | |
20 | ***/ | |
21 | ||
9eb977db | 22 | #include <errno.h> |
11c3a366 | 23 | #include <limits.h> |
07630cea LP |
24 | #include <stdio.h> |
25 | #include <stdlib.h> | |
26 | #include <string.h> | |
11c3a366 | 27 | #include <sys/stat.h> |
07630cea | 28 | #include <unistd.h> |
9eb977db | 29 | |
5f311f8c LP |
30 | /* When we include libgen.h because we need dirname() we immediately |
31 | * undefine basename() since libgen.h defines it as a macro to the | |
32 | * POSIX version which is really broken. We prefer GNU basename(). */ | |
33 | #include <libgen.h> | |
34 | #undef basename | |
35 | ||
b5efdb8a | 36 | #include "alloc-util.h" |
93cc7779 | 37 | #include "extract-word.h" |
f4f15635 | 38 | #include "fs-util.h" |
9eb977db | 39 | #include "log.h" |
07630cea LP |
40 | #include "macro.h" |
41 | #include "missing.h" | |
3ffd4af2 | 42 | #include "path-util.h" |
8fcde012 | 43 | #include "stat-util.h" |
07630cea | 44 | #include "string-util.h" |
9eb977db | 45 | #include "strv.h" |
93cc7779 | 46 | #include "time-util.h" |
9eb977db KS |
47 | |
48 | bool path_is_absolute(const char *p) { | |
49 | return p[0] == '/'; | |
50 | } | |
51 | ||
52 | bool is_path(const char *p) { | |
53 | return !!strchr(p, '/'); | |
54 | } | |
55 | ||
0f474365 | 56 | int path_split_and_make_absolute(const char *p, char ***ret) { |
9eb977db | 57 | char **l; |
0f474365 LP |
58 | int r; |
59 | ||
9eb977db | 60 | assert(p); |
0f474365 | 61 | assert(ret); |
9eb977db | 62 | |
116cc028 ZJS |
63 | l = strv_split(p, ":"); |
64 | if (!l) | |
ce9d6bcf | 65 | return -ENOMEM; |
9eb977db | 66 | |
0f474365 LP |
67 | r = path_strv_make_absolute_cwd(l); |
68 | if (r < 0) { | |
9eb977db | 69 | strv_free(l); |
0f474365 | 70 | return r; |
9eb977db KS |
71 | } |
72 | ||
0f474365 LP |
73 | *ret = l; |
74 | return r; | |
9eb977db KS |
75 | } |
76 | ||
77 | char *path_make_absolute(const char *p, const char *prefix) { | |
78 | assert(p); | |
79 | ||
80 | /* Makes every item in the list an absolute path by prepending | |
81 | * the prefix, if specified and necessary */ | |
82 | ||
83 | if (path_is_absolute(p) || !prefix) | |
84 | return strdup(p); | |
85 | ||
b7def684 | 86 | return strjoin(prefix, "/", p, NULL); |
9eb977db KS |
87 | } |
88 | ||
0f474365 LP |
89 | int path_make_absolute_cwd(const char *p, char **ret) { |
90 | char *c; | |
9eb977db KS |
91 | |
92 | assert(p); | |
0f474365 | 93 | assert(ret); |
9eb977db KS |
94 | |
95 | /* Similar to path_make_absolute(), but prefixes with the | |
96 | * current working directory. */ | |
97 | ||
98 | if (path_is_absolute(p)) | |
0f474365 LP |
99 | c = strdup(p); |
100 | else { | |
101 | _cleanup_free_ char *cwd = NULL; | |
9eb977db | 102 | |
0f474365 LP |
103 | cwd = get_current_dir_name(); |
104 | if (!cwd) | |
9c4615fb | 105 | return negative_errno(); |
0f474365 LP |
106 | |
107 | c = strjoin(cwd, "/", p, NULL); | |
108 | } | |
109 | if (!c) | |
110 | return -ENOMEM; | |
9eb977db | 111 | |
0f474365 LP |
112 | *ret = c; |
113 | return 0; | |
9eb977db KS |
114 | } |
115 | ||
7cb9c51c TK |
116 | int path_make_relative(const char *from_dir, const char *to_path, char **_r) { |
117 | char *r, *p; | |
118 | unsigned n_parents; | |
7cb9c51c TK |
119 | |
120 | assert(from_dir); | |
121 | assert(to_path); | |
122 | assert(_r); | |
123 | ||
124 | /* Strips the common part, and adds ".." elements as necessary. */ | |
125 | ||
126 | if (!path_is_absolute(from_dir)) | |
127 | return -EINVAL; | |
128 | ||
129 | if (!path_is_absolute(to_path)) | |
130 | return -EINVAL; | |
131 | ||
132 | /* Skip the common part. */ | |
133 | for (;;) { | |
134 | size_t a; | |
135 | size_t b; | |
136 | ||
137 | from_dir += strspn(from_dir, "/"); | |
138 | to_path += strspn(to_path, "/"); | |
139 | ||
140 | if (!*from_dir) { | |
141 | if (!*to_path) | |
142 | /* from_dir equals to_path. */ | |
143 | r = strdup("."); | |
144 | else | |
145 | /* from_dir is a parent directory of to_path. */ | |
146 | r = strdup(to_path); | |
147 | ||
148 | if (!r) | |
149 | return -ENOMEM; | |
150 | ||
5216f599 TK |
151 | path_kill_slashes(r); |
152 | ||
7cb9c51c TK |
153 | *_r = r; |
154 | return 0; | |
155 | } | |
156 | ||
157 | if (!*to_path) | |
158 | break; | |
159 | ||
160 | a = strcspn(from_dir, "/"); | |
161 | b = strcspn(to_path, "/"); | |
162 | ||
163 | if (a != b) | |
164 | break; | |
165 | ||
166 | if (memcmp(from_dir, to_path, a) != 0) | |
167 | break; | |
168 | ||
169 | from_dir += a; | |
170 | to_path += b; | |
171 | } | |
172 | ||
173 | /* If we're here, then "from_dir" has one or more elements that need to | |
174 | * be replaced with "..". */ | |
175 | ||
176 | /* Count the number of necessary ".." elements. */ | |
177 | for (n_parents = 0;;) { | |
178 | from_dir += strspn(from_dir, "/"); | |
179 | ||
180 | if (!*from_dir) | |
181 | break; | |
182 | ||
183 | from_dir += strcspn(from_dir, "/"); | |
184 | n_parents++; | |
185 | } | |
186 | ||
5216f599 | 187 | r = malloc(n_parents * 3 + strlen(to_path) + 1); |
7cb9c51c TK |
188 | if (!r) |
189 | return -ENOMEM; | |
190 | ||
191 | for (p = r; n_parents > 0; n_parents--, p += 3) | |
192 | memcpy(p, "../", 3); | |
193 | ||
5216f599 TK |
194 | strcpy(p, to_path); |
195 | path_kill_slashes(r); | |
7cb9c51c TK |
196 | |
197 | *_r = r; | |
198 | return 0; | |
199 | } | |
200 | ||
0f474365 | 201 | int path_strv_make_absolute_cwd(char **l) { |
9eb977db | 202 | char **s; |
0f474365 | 203 | int r; |
9eb977db KS |
204 | |
205 | /* Goes through every item in the string list and makes it | |
206 | * absolute. This works in place and won't rollback any | |
207 | * changes on failure. */ | |
208 | ||
209 | STRV_FOREACH(s, l) { | |
210 | char *t; | |
211 | ||
0f474365 LP |
212 | r = path_make_absolute_cwd(*s, &t); |
213 | if (r < 0) | |
214 | return r; | |
9eb977db KS |
215 | |
216 | free(*s); | |
217 | *s = t; | |
218 | } | |
219 | ||
0f474365 | 220 | return 0; |
9eb977db KS |
221 | } |
222 | ||
7d8da2c9 | 223 | char **path_strv_resolve(char **l, const char *prefix) { |
9eb977db KS |
224 | char **s; |
225 | unsigned k = 0; | |
226 | bool enomem = false; | |
227 | ||
228 | if (strv_isempty(l)) | |
229 | return l; | |
230 | ||
231 | /* Goes through every item in the string list and canonicalize | |
232 | * the path. This works in place and won't rollback any | |
233 | * changes on failure. */ | |
234 | ||
235 | STRV_FOREACH(s, l) { | |
236 | char *t, *u; | |
12ed81d9 | 237 | _cleanup_free_ char *orig = NULL; |
9eb977db | 238 | |
12ed81d9 ZJS |
239 | if (!path_is_absolute(*s)) { |
240 | free(*s); | |
9eb977db | 241 | continue; |
12ed81d9 | 242 | } |
112cfb18 MM |
243 | |
244 | if (prefix) { | |
12ed81d9 ZJS |
245 | orig = *s; |
246 | t = strappend(prefix, orig); | |
112cfb18 MM |
247 | if (!t) { |
248 | enomem = true; | |
249 | continue; | |
250 | } | |
12ed81d9 | 251 | } else |
112cfb18 | 252 | t = *s; |
9eb977db KS |
253 | |
254 | errno = 0; | |
255 | u = canonicalize_file_name(t); | |
9eb977db | 256 | if (!u) { |
12ed81d9 ZJS |
257 | if (errno == ENOENT) { |
258 | if (prefix) { | |
259 | u = orig; | |
260 | orig = NULL; | |
261 | free(t); | |
262 | } else | |
263 | u = t; | |
264 | } else { | |
874310b7 | 265 | free(t); |
112cfb18 | 266 | if (errno == ENOMEM || errno == 0) |
874310b7 ZJS |
267 | enomem = true; |
268 | ||
269 | continue; | |
270 | } | |
12ed81d9 ZJS |
271 | } else if (prefix) { |
272 | char *x; | |
273 | ||
274 | free(t); | |
275 | x = path_startswith(u, prefix); | |
276 | if (x) { | |
277 | /* restore the slash if it was lost */ | |
278 | if (!startswith(x, "/")) | |
279 | *(--x) = '/'; | |
280 | ||
281 | t = strdup(x); | |
282 | free(u); | |
283 | if (!t) { | |
284 | enomem = true; | |
285 | continue; | |
286 | } | |
287 | u = t; | |
288 | } else { | |
289 | /* canonicalized path goes outside of | |
290 | * prefix, keep the original path instead */ | |
3542eac7 | 291 | free(u); |
12ed81d9 ZJS |
292 | u = orig; |
293 | orig = NULL; | |
294 | } | |
91a6489d LP |
295 | } else |
296 | free(t); | |
9eb977db KS |
297 | |
298 | l[k++] = u; | |
299 | } | |
300 | ||
301 | l[k] = NULL; | |
302 | ||
303 | if (enomem) | |
304 | return NULL; | |
305 | ||
306 | return l; | |
307 | } | |
308 | ||
7d8da2c9 | 309 | char **path_strv_resolve_uniq(char **l, const char *prefix) { |
112cfb18 | 310 | |
fabe5c0e LP |
311 | if (strv_isempty(l)) |
312 | return l; | |
313 | ||
7d8da2c9 | 314 | if (!path_strv_resolve(l, prefix)) |
fabe5c0e LP |
315 | return NULL; |
316 | ||
317 | return strv_uniq(l); | |
318 | } | |
319 | ||
9eb977db KS |
320 | char *path_kill_slashes(char *path) { |
321 | char *f, *t; | |
322 | bool slash = false; | |
323 | ||
324 | /* Removes redundant inner and trailing slashes. Modifies the | |
325 | * passed string in-place. | |
326 | * | |
327 | * ///foo///bar/ becomes /foo/bar | |
328 | */ | |
329 | ||
330 | for (f = path, t = path; *f; f++) { | |
331 | ||
332 | if (*f == '/') { | |
333 | slash = true; | |
334 | continue; | |
335 | } | |
336 | ||
337 | if (slash) { | |
338 | slash = false; | |
339 | *(t++) = '/'; | |
340 | } | |
341 | ||
342 | *(t++) = *f; | |
343 | } | |
344 | ||
345 | /* Special rule, if we are talking of the root directory, a | |
346 | trailing slash is good */ | |
347 | ||
348 | if (t == path && slash) | |
349 | *(t++) = '/'; | |
350 | ||
351 | *t = 0; | |
352 | return path; | |
353 | } | |
354 | ||
424a19f8 | 355 | char* path_startswith(const char *path, const char *prefix) { |
9eb977db KS |
356 | assert(path); |
357 | assert(prefix); | |
358 | ||
359 | if ((path[0] == '/') != (prefix[0] == '/')) | |
424a19f8 | 360 | return NULL; |
9eb977db KS |
361 | |
362 | for (;;) { | |
363 | size_t a, b; | |
364 | ||
365 | path += strspn(path, "/"); | |
366 | prefix += strspn(prefix, "/"); | |
367 | ||
368 | if (*prefix == 0) | |
424a19f8 | 369 | return (char*) path; |
9eb977db KS |
370 | |
371 | if (*path == 0) | |
424a19f8 | 372 | return NULL; |
9eb977db KS |
373 | |
374 | a = strcspn(path, "/"); | |
375 | b = strcspn(prefix, "/"); | |
376 | ||
377 | if (a != b) | |
424a19f8 | 378 | return NULL; |
9eb977db KS |
379 | |
380 | if (memcmp(path, prefix, a) != 0) | |
424a19f8 | 381 | return NULL; |
9eb977db KS |
382 | |
383 | path += a; | |
384 | prefix += b; | |
385 | } | |
386 | } | |
387 | ||
2230852b MS |
388 | int path_compare(const char *a, const char *b) { |
389 | int d; | |
390 | ||
9eb977db KS |
391 | assert(a); |
392 | assert(b); | |
393 | ||
2230852b MS |
394 | /* A relative path and an abolute path must not compare as equal. |
395 | * Which one is sorted before the other does not really matter. | |
396 | * Here a relative path is ordered before an absolute path. */ | |
397 | d = (a[0] == '/') - (b[0] == '/'); | |
373cd63a | 398 | if (d != 0) |
2230852b | 399 | return d; |
9eb977db KS |
400 | |
401 | for (;;) { | |
402 | size_t j, k; | |
403 | ||
404 | a += strspn(a, "/"); | |
405 | b += strspn(b, "/"); | |
406 | ||
407 | if (*a == 0 && *b == 0) | |
2230852b | 408 | return 0; |
9eb977db | 409 | |
2230852b MS |
410 | /* Order prefixes first: "/foo" before "/foo/bar" */ |
411 | if (*a == 0) | |
412 | return -1; | |
413 | if (*b == 0) | |
414 | return 1; | |
9eb977db KS |
415 | |
416 | j = strcspn(a, "/"); | |
417 | k = strcspn(b, "/"); | |
418 | ||
2230852b MS |
419 | /* Alphabetical sort: "/foo/aaa" before "/foo/b" */ |
420 | d = memcmp(a, b, MIN(j, k)); | |
373cd63a | 421 | if (d != 0) |
2230852b | 422 | return (d > 0) - (d < 0); /* sign of d */ |
9eb977db | 423 | |
2230852b MS |
424 | /* Sort "/foo/a" before "/foo/aaa" */ |
425 | d = (j > k) - (j < k); /* sign of (j - k) */ | |
373cd63a | 426 | if (d != 0) |
2230852b | 427 | return d; |
9eb977db KS |
428 | |
429 | a += j; | |
430 | b += k; | |
431 | } | |
432 | } | |
433 | ||
2230852b MS |
434 | bool path_equal(const char *a, const char *b) { |
435 | return path_compare(a, b) == 0; | |
436 | } | |
437 | ||
c78e47a6 MS |
438 | bool path_equal_or_files_same(const char *a, const char *b) { |
439 | return path_equal(a, b) || files_same(a, b) > 0; | |
440 | } | |
441 | ||
0c6ea3a4 ZJS |
442 | char* path_join(const char *root, const char *path, const char *rest) { |
443 | assert(path); | |
444 | ||
445 | if (!isempty(root)) | |
bc854dc7 | 446 | return strjoin(root, endswith(root, "/") ? "" : "/", |
0c6ea3a4 | 447 | path[0] == '/' ? path+1 : path, |
bc854dc7 | 448 | rest ? (endswith(path, "/") ? "" : "/") : NULL, |
0c6ea3a4 ZJS |
449 | rest && rest[0] == '/' ? rest+1 : rest, |
450 | NULL); | |
451 | else | |
452 | return strjoin(path, | |
bc854dc7 | 453 | rest ? (endswith(path, "/") ? "" : "/") : NULL, |
0c6ea3a4 ZJS |
454 | rest && rest[0] == '/' ? rest+1 : rest, |
455 | NULL); | |
456 | } | |
457 | ||
85eca92e LP |
458 | int find_binary(const char *name, char **ret) { |
459 | int last_error, r; | |
460 | const char *p; | |
461 | ||
c9d954b2 | 462 | assert(name); |
4087cb9e | 463 | |
571d0134 | 464 | if (is_path(name)) { |
85eca92e | 465 | if (access(name, X_OK) < 0) |
b972115c ZJS |
466 | return -errno; |
467 | ||
85eca92e | 468 | if (ret) { |
0f474365 LP |
469 | r = path_make_absolute_cwd(name, ret); |
470 | if (r < 0) | |
471 | return r; | |
eb66db55 | 472 | } |
c9d954b2 | 473 | |
c9d954b2 | 474 | return 0; |
85eca92e | 475 | } |
c9d954b2 | 476 | |
85eca92e LP |
477 | /** |
478 | * Plain getenv, not secure_getenv, because we want | |
479 | * to actually allow the user to pick the binary. | |
480 | */ | |
481 | p = getenv("PATH"); | |
482 | if (!p) | |
483 | p = DEFAULT_PATH; | |
484 | ||
485 | last_error = -ENOENT; | |
486 | ||
487 | for (;;) { | |
488 | _cleanup_free_ char *j = NULL, *element = NULL; | |
489 | ||
490 | r = extract_first_word(&p, &element, ":", EXTRACT_RELAX|EXTRACT_DONT_COALESCE_SEPARATORS); | |
491 | if (r < 0) | |
492 | return r; | |
493 | if (r == 0) | |
494 | break; | |
495 | ||
0f474365 LP |
496 | if (!path_is_absolute(element)) |
497 | continue; | |
498 | ||
85eca92e LP |
499 | j = strjoin(element, "/", name, NULL); |
500 | if (!j) | |
501 | return -ENOMEM; | |
502 | ||
503 | if (access(j, X_OK) >= 0) { | |
504 | /* Found it! */ | |
c9d954b2 | 505 | |
85eca92e LP |
506 | if (ret) { |
507 | *ret = path_kill_slashes(j); | |
508 | j = NULL; | |
eb66db55 | 509 | } |
c9d954b2 ZJS |
510 | |
511 | return 0; | |
512 | } | |
513 | ||
85eca92e | 514 | last_error = -errno; |
c9d954b2 | 515 | } |
85eca92e LP |
516 | |
517 | return last_error; | |
c9d954b2 | 518 | } |
8e184852 | 519 | |
2ad8416d | 520 | bool paths_check_timestamp(const char* const* paths, usec_t *timestamp, bool update) { |
8e184852 | 521 | bool changed = false; |
2ad8416d | 522 | const char* const* i; |
8e184852 | 523 | |
97f2d76d TG |
524 | assert(timestamp); |
525 | ||
8e184852 | 526 | if (paths == NULL) |
4087cb9e | 527 | return false; |
8e184852 | 528 | |
4087cb9e | 529 | STRV_FOREACH(i, paths) { |
8e184852 | 530 | struct stat stats; |
4087cb9e | 531 | usec_t u; |
8e184852 | 532 | |
4087cb9e | 533 | if (stat(*i, &stats) < 0) |
8e184852 TG |
534 | continue; |
535 | ||
4087cb9e LP |
536 | u = timespec_load(&stats.st_mtim); |
537 | ||
97f2d76d | 538 | /* first check */ |
4087cb9e | 539 | if (*timestamp >= u) |
8e184852 TG |
540 | continue; |
541 | ||
9f6445e3 | 542 | log_debug("timestamp of '%s' changed", *i); |
8e184852 TG |
543 | |
544 | /* update timestamp */ | |
4087cb9e LP |
545 | if (update) { |
546 | *timestamp = u; | |
547 | changed = true; | |
548 | } else | |
549 | return true; | |
8e184852 | 550 | } |
4087cb9e | 551 | |
8e184852 TG |
552 | return changed; |
553 | } | |
eb66db55 | 554 | |
5bcd08db | 555 | static int binary_is_good(const char *binary) { |
571d0134 | 556 | _cleanup_free_ char *p = NULL, *d = NULL; |
571d0134 | 557 | int r; |
eb66db55 | 558 | |
85eca92e LP |
559 | r = find_binary(binary, &p); |
560 | if (r == -ENOENT) | |
561 | return 0; | |
571d0134 LP |
562 | if (r < 0) |
563 | return r; | |
564 | ||
061df014 | 565 | /* An fsck that is linked to /bin/true is a non-existent |
571d0134 LP |
566 | * fsck */ |
567 | ||
568 | r = readlink_malloc(p, &d); | |
85eca92e LP |
569 | if (r == -EINVAL) /* not a symlink */ |
570 | return 1; | |
571 | if (r < 0) | |
572 | return r; | |
571d0134 | 573 | |
85eca92e LP |
574 | return !path_equal(d, "true") && |
575 | !path_equal(d, "/bin/true") && | |
576 | !path_equal(d, "/usr/bin/true") && | |
577 | !path_equal(d, "/dev/null"); | |
eb66db55 | 578 | } |
1d13f648 | 579 | |
5bcd08db LP |
580 | int fsck_exists(const char *fstype) { |
581 | const char *checker; | |
582 | ||
85eca92e | 583 | assert(fstype); |
5bcd08db | 584 | |
85eca92e LP |
585 | if (streq(fstype, "auto")) |
586 | return -EINVAL; | |
587 | ||
588 | checker = strjoina("fsck.", fstype); | |
5bcd08db LP |
589 | return binary_is_good(checker); |
590 | } | |
591 | ||
592 | int mkfs_exists(const char *fstype) { | |
593 | const char *mkfs; | |
594 | ||
85eca92e | 595 | assert(fstype); |
5bcd08db | 596 | |
85eca92e LP |
597 | if (streq(fstype, "auto")) |
598 | return -EINVAL; | |
599 | ||
600 | mkfs = strjoina("mkfs.", fstype); | |
5bcd08db LP |
601 | return binary_is_good(mkfs); |
602 | } | |
603 | ||
1d13f648 LP |
604 | char *prefix_root(const char *root, const char *path) { |
605 | char *n, *p; | |
606 | size_t l; | |
607 | ||
608 | /* If root is passed, prefixes path with it. Otherwise returns | |
609 | * it as is. */ | |
610 | ||
611 | assert(path); | |
612 | ||
613 | /* First, drop duplicate prefixing slashes from the path */ | |
614 | while (path[0] == '/' && path[1] == '/') | |
615 | path++; | |
616 | ||
617 | if (isempty(root) || path_equal(root, "/")) | |
618 | return strdup(path); | |
619 | ||
620 | l = strlen(root) + 1 + strlen(path) + 1; | |
621 | ||
622 | n = new(char, l); | |
623 | if (!n) | |
624 | return NULL; | |
625 | ||
626 | p = stpcpy(n, root); | |
627 | ||
628 | while (p > n && p[-1] == '/') | |
629 | p--; | |
630 | ||
631 | if (path[0] != '/') | |
632 | *(p++) = '/'; | |
633 | ||
634 | strcpy(p, path); | |
635 | return n; | |
636 | } | |
0f03c2a4 LP |
637 | |
638 | int parse_path_argument_and_warn(const char *path, bool suppress_root, char **arg) { | |
639 | char *p; | |
640 | int r; | |
641 | ||
642 | /* | |
643 | * This function is intended to be used in command line | |
644 | * parsers, to handle paths that are passed in. It makes the | |
645 | * path absolute, and reduces it to NULL if omitted or | |
646 | * root (the latter optionally). | |
647 | * | |
648 | * NOTE THAT THIS WILL FREE THE PREVIOUS ARGUMENT POINTER ON | |
649 | * SUCCESS! Hence, do not pass in uninitialized pointers. | |
650 | */ | |
651 | ||
652 | if (isempty(path)) { | |
653 | *arg = mfree(*arg); | |
654 | return 0; | |
655 | } | |
656 | ||
657 | r = path_make_absolute_cwd(path, &p); | |
658 | if (r < 0) | |
659 | return log_error_errno(r, "Failed to parse path \"%s\" and make it absolute: %m", path); | |
660 | ||
661 | path_kill_slashes(p); | |
662 | if (suppress_root && path_equal(p, "/")) | |
663 | p = mfree(p); | |
664 | ||
665 | free(*arg); | |
666 | *arg = p; | |
667 | return 0; | |
668 | } | |
5f311f8c LP |
669 | |
670 | char* dirname_malloc(const char *path) { | |
671 | char *d, *dir, *dir2; | |
672 | ||
673 | assert(path); | |
674 | ||
675 | d = strdup(path); | |
676 | if (!d) | |
677 | return NULL; | |
678 | ||
679 | dir = dirname(d); | |
680 | assert(dir); | |
681 | ||
682 | if (dir == d) | |
683 | return d; | |
684 | ||
685 | dir2 = strdup(dir); | |
686 | free(d); | |
687 | ||
688 | return dir2; | |
689 | } | |
bb15fafe LP |
690 | |
691 | bool filename_is_valid(const char *p) { | |
692 | const char *e; | |
693 | ||
694 | if (isempty(p)) | |
695 | return false; | |
696 | ||
697 | if (streq(p, ".")) | |
698 | return false; | |
699 | ||
700 | if (streq(p, "..")) | |
701 | return false; | |
702 | ||
703 | e = strchrnul(p, '/'); | |
704 | if (*e != 0) | |
705 | return false; | |
706 | ||
707 | if (e - p > FILENAME_MAX) | |
708 | return false; | |
709 | ||
710 | return true; | |
711 | } | |
712 | ||
713 | bool path_is_safe(const char *p) { | |
714 | ||
715 | if (isempty(p)) | |
716 | return false; | |
717 | ||
718 | if (streq(p, "..") || startswith(p, "../") || endswith(p, "/..") || strstr(p, "/../")) | |
719 | return false; | |
720 | ||
721 | if (strlen(p)+1 > PATH_MAX) | |
722 | return false; | |
723 | ||
724 | /* The following two checks are not really dangerous, but hey, they still are confusing */ | |
725 | if (streq(p, ".") || startswith(p, "./") || endswith(p, "/.") || strstr(p, "/./")) | |
726 | return false; | |
727 | ||
728 | if (strstr(p, "//")) | |
729 | return false; | |
730 | ||
731 | return true; | |
732 | } | |
a0956174 LP |
733 | |
734 | char *file_in_same_dir(const char *path, const char *filename) { | |
735 | char *e, *ret; | |
736 | size_t k; | |
737 | ||
738 | assert(path); | |
739 | assert(filename); | |
740 | ||
741 | /* This removes the last component of path and appends | |
742 | * filename, unless the latter is absolute anyway or the | |
743 | * former isn't */ | |
744 | ||
745 | if (path_is_absolute(filename)) | |
746 | return strdup(filename); | |
747 | ||
748 | e = strrchr(path, '/'); | |
749 | if (!e) | |
750 | return strdup(filename); | |
751 | ||
752 | k = strlen(filename); | |
753 | ret = new(char, (e + 1 - path) + k + 1); | |
754 | if (!ret) | |
755 | return NULL; | |
756 | ||
757 | memcpy(mempcpy(ret, path, e + 1 - path), filename, k + 1); | |
758 | return ret; | |
759 | } | |
760 | ||
761 | bool hidden_file_allow_backup(const char *filename) { | |
762 | assert(filename); | |
763 | ||
764 | return | |
765 | filename[0] == '.' || | |
766 | streq(filename, "lost+found") || | |
767 | streq(filename, "aquota.user") || | |
768 | streq(filename, "aquota.group") || | |
769 | endswith(filename, ".rpmnew") || | |
770 | endswith(filename, ".rpmsave") || | |
771 | endswith(filename, ".rpmorig") || | |
772 | endswith(filename, ".dpkg-old") || | |
773 | endswith(filename, ".dpkg-new") || | |
774 | endswith(filename, ".dpkg-tmp") || | |
775 | endswith(filename, ".dpkg-dist") || | |
776 | endswith(filename, ".dpkg-bak") || | |
777 | endswith(filename, ".dpkg-backup") || | |
778 | endswith(filename, ".dpkg-remove") || | |
779 | endswith(filename, ".swp"); | |
780 | } | |
781 | ||
782 | bool hidden_file(const char *filename) { | |
783 | assert(filename); | |
784 | ||
785 | if (endswith(filename, "~")) | |
786 | return true; | |
787 | ||
788 | return hidden_file_allow_backup(filename); | |
789 | } | |
790 | ||
791 | bool is_device_path(const char *path) { | |
792 | ||
793 | /* Returns true on paths that refer to a device, either in | |
794 | * sysfs or in /dev */ | |
795 | ||
796 | return | |
797 | path_startswith(path, "/dev/") || | |
798 | path_startswith(path, "/sys/"); | |
799 | } |