]>
Commit | Line | Data |
---|---|---|
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> |
9eb977db | 23 | #include <fcntl.h> |
07630cea LP |
24 | #include <stdio.h> |
25 | #include <stdlib.h> | |
26 | #include <string.h> | |
9eb977db | 27 | #include <sys/statvfs.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" |
3ffd4af2 | 37 | #include "fd-util.h" |
07630cea | 38 | #include "fileio.h" |
f4f15635 | 39 | #include "fs-util.h" |
9eb977db | 40 | #include "log.h" |
07630cea LP |
41 | #include "macro.h" |
42 | #include "missing.h" | |
6bedfcbb | 43 | #include "parse-util.h" |
3ffd4af2 | 44 | #include "path-util.h" |
8fcde012 | 45 | #include "stat-util.h" |
07630cea | 46 | #include "string-util.h" |
9eb977db | 47 | #include "strv.h" |
07630cea | 48 | #include "util.h" |
9eb977db KS |
49 | |
50 | bool path_is_absolute(const char *p) { | |
51 | return p[0] == '/'; | |
52 | } | |
53 | ||
54 | bool is_path(const char *p) { | |
55 | return !!strchr(p, '/'); | |
56 | } | |
57 | ||
0f474365 | 58 | int path_split_and_make_absolute(const char *p, char ***ret) { |
9eb977db | 59 | char **l; |
0f474365 LP |
60 | int r; |
61 | ||
9eb977db | 62 | assert(p); |
0f474365 | 63 | assert(ret); |
9eb977db | 64 | |
116cc028 ZJS |
65 | l = strv_split(p, ":"); |
66 | if (!l) | |
ce9d6bcf | 67 | return -ENOMEM; |
9eb977db | 68 | |
0f474365 LP |
69 | r = path_strv_make_absolute_cwd(l); |
70 | if (r < 0) { | |
9eb977db | 71 | strv_free(l); |
0f474365 | 72 | return r; |
9eb977db KS |
73 | } |
74 | ||
0f474365 LP |
75 | *ret = l; |
76 | return r; | |
9eb977db KS |
77 | } |
78 | ||
79 | char *path_make_absolute(const char *p, const char *prefix) { | |
80 | assert(p); | |
81 | ||
82 | /* Makes every item in the list an absolute path by prepending | |
83 | * the prefix, if specified and necessary */ | |
84 | ||
85 | if (path_is_absolute(p) || !prefix) | |
86 | return strdup(p); | |
87 | ||
b7def684 | 88 | return strjoin(prefix, "/", p, NULL); |
9eb977db KS |
89 | } |
90 | ||
0f474365 LP |
91 | int path_make_absolute_cwd(const char *p, char **ret) { |
92 | char *c; | |
9eb977db KS |
93 | |
94 | assert(p); | |
0f474365 | 95 | assert(ret); |
9eb977db KS |
96 | |
97 | /* Similar to path_make_absolute(), but prefixes with the | |
98 | * current working directory. */ | |
99 | ||
100 | if (path_is_absolute(p)) | |
0f474365 LP |
101 | c = strdup(p); |
102 | else { | |
103 | _cleanup_free_ char *cwd = NULL; | |
9eb977db | 104 | |
0f474365 LP |
105 | cwd = get_current_dir_name(); |
106 | if (!cwd) | |
107 | return -errno; | |
108 | ||
109 | c = strjoin(cwd, "/", p, NULL); | |
110 | } | |
111 | if (!c) | |
112 | return -ENOMEM; | |
9eb977db | 113 | |
0f474365 LP |
114 | *ret = c; |
115 | return 0; | |
9eb977db KS |
116 | } |
117 | ||
7cb9c51c TK |
118 | int path_make_relative(const char *from_dir, const char *to_path, char **_r) { |
119 | char *r, *p; | |
120 | unsigned n_parents; | |
7cb9c51c TK |
121 | |
122 | assert(from_dir); | |
123 | assert(to_path); | |
124 | assert(_r); | |
125 | ||
126 | /* Strips the common part, and adds ".." elements as necessary. */ | |
127 | ||
128 | if (!path_is_absolute(from_dir)) | |
129 | return -EINVAL; | |
130 | ||
131 | if (!path_is_absolute(to_path)) | |
132 | return -EINVAL; | |
133 | ||
134 | /* Skip the common part. */ | |
135 | for (;;) { | |
136 | size_t a; | |
137 | size_t b; | |
138 | ||
139 | from_dir += strspn(from_dir, "/"); | |
140 | to_path += strspn(to_path, "/"); | |
141 | ||
142 | if (!*from_dir) { | |
143 | if (!*to_path) | |
144 | /* from_dir equals to_path. */ | |
145 | r = strdup("."); | |
146 | else | |
147 | /* from_dir is a parent directory of to_path. */ | |
148 | r = strdup(to_path); | |
149 | ||
150 | if (!r) | |
151 | return -ENOMEM; | |
152 | ||
5216f599 TK |
153 | path_kill_slashes(r); |
154 | ||
7cb9c51c TK |
155 | *_r = r; |
156 | return 0; | |
157 | } | |
158 | ||
159 | if (!*to_path) | |
160 | break; | |
161 | ||
162 | a = strcspn(from_dir, "/"); | |
163 | b = strcspn(to_path, "/"); | |
164 | ||
165 | if (a != b) | |
166 | break; | |
167 | ||
168 | if (memcmp(from_dir, to_path, a) != 0) | |
169 | break; | |
170 | ||
171 | from_dir += a; | |
172 | to_path += b; | |
173 | } | |
174 | ||
175 | /* If we're here, then "from_dir" has one or more elements that need to | |
176 | * be replaced with "..". */ | |
177 | ||
178 | /* Count the number of necessary ".." elements. */ | |
179 | for (n_parents = 0;;) { | |
180 | from_dir += strspn(from_dir, "/"); | |
181 | ||
182 | if (!*from_dir) | |
183 | break; | |
184 | ||
185 | from_dir += strcspn(from_dir, "/"); | |
186 | n_parents++; | |
187 | } | |
188 | ||
5216f599 | 189 | r = malloc(n_parents * 3 + strlen(to_path) + 1); |
7cb9c51c TK |
190 | if (!r) |
191 | return -ENOMEM; | |
192 | ||
193 | for (p = r; n_parents > 0; n_parents--, p += 3) | |
194 | memcpy(p, "../", 3); | |
195 | ||
5216f599 TK |
196 | strcpy(p, to_path); |
197 | path_kill_slashes(r); | |
7cb9c51c TK |
198 | |
199 | *_r = r; | |
200 | return 0; | |
201 | } | |
202 | ||
0f474365 | 203 | int path_strv_make_absolute_cwd(char **l) { |
9eb977db | 204 | char **s; |
0f474365 | 205 | int r; |
9eb977db KS |
206 | |
207 | /* Goes through every item in the string list and makes it | |
208 | * absolute. This works in place and won't rollback any | |
209 | * changes on failure. */ | |
210 | ||
211 | STRV_FOREACH(s, l) { | |
212 | char *t; | |
213 | ||
0f474365 LP |
214 | r = path_make_absolute_cwd(*s, &t); |
215 | if (r < 0) | |
216 | return r; | |
9eb977db KS |
217 | |
218 | free(*s); | |
219 | *s = t; | |
220 | } | |
221 | ||
0f474365 | 222 | return 0; |
9eb977db KS |
223 | } |
224 | ||
7d8da2c9 | 225 | char **path_strv_resolve(char **l, const char *prefix) { |
9eb977db KS |
226 | char **s; |
227 | unsigned k = 0; | |
228 | bool enomem = false; | |
229 | ||
230 | if (strv_isempty(l)) | |
231 | return l; | |
232 | ||
233 | /* Goes through every item in the string list and canonicalize | |
234 | * the path. This works in place and won't rollback any | |
235 | * changes on failure. */ | |
236 | ||
237 | STRV_FOREACH(s, l) { | |
238 | char *t, *u; | |
12ed81d9 | 239 | _cleanup_free_ char *orig = NULL; |
9eb977db | 240 | |
12ed81d9 ZJS |
241 | if (!path_is_absolute(*s)) { |
242 | free(*s); | |
9eb977db | 243 | continue; |
12ed81d9 | 244 | } |
112cfb18 MM |
245 | |
246 | if (prefix) { | |
12ed81d9 ZJS |
247 | orig = *s; |
248 | t = strappend(prefix, orig); | |
112cfb18 MM |
249 | if (!t) { |
250 | enomem = true; | |
251 | continue; | |
252 | } | |
12ed81d9 | 253 | } else |
112cfb18 | 254 | t = *s; |
9eb977db KS |
255 | |
256 | errno = 0; | |
257 | u = canonicalize_file_name(t); | |
9eb977db | 258 | if (!u) { |
12ed81d9 ZJS |
259 | if (errno == ENOENT) { |
260 | if (prefix) { | |
261 | u = orig; | |
262 | orig = NULL; | |
263 | free(t); | |
264 | } else | |
265 | u = t; | |
266 | } else { | |
874310b7 | 267 | free(t); |
112cfb18 | 268 | if (errno == ENOMEM || errno == 0) |
874310b7 ZJS |
269 | enomem = true; |
270 | ||
271 | continue; | |
272 | } | |
12ed81d9 ZJS |
273 | } else if (prefix) { |
274 | char *x; | |
275 | ||
276 | free(t); | |
277 | x = path_startswith(u, prefix); | |
278 | if (x) { | |
279 | /* restore the slash if it was lost */ | |
280 | if (!startswith(x, "/")) | |
281 | *(--x) = '/'; | |
282 | ||
283 | t = strdup(x); | |
284 | free(u); | |
285 | if (!t) { | |
286 | enomem = true; | |
287 | continue; | |
288 | } | |
289 | u = t; | |
290 | } else { | |
291 | /* canonicalized path goes outside of | |
292 | * prefix, keep the original path instead */ | |
3542eac7 | 293 | free(u); |
12ed81d9 ZJS |
294 | u = orig; |
295 | orig = NULL; | |
296 | } | |
91a6489d LP |
297 | } else |
298 | free(t); | |
9eb977db KS |
299 | |
300 | l[k++] = u; | |
301 | } | |
302 | ||
303 | l[k] = NULL; | |
304 | ||
305 | if (enomem) | |
306 | return NULL; | |
307 | ||
308 | return l; | |
309 | } | |
310 | ||
7d8da2c9 | 311 | char **path_strv_resolve_uniq(char **l, const char *prefix) { |
112cfb18 | 312 | |
fabe5c0e LP |
313 | if (strv_isempty(l)) |
314 | return l; | |
315 | ||
7d8da2c9 | 316 | if (!path_strv_resolve(l, prefix)) |
fabe5c0e LP |
317 | return NULL; |
318 | ||
319 | return strv_uniq(l); | |
320 | } | |
321 | ||
9eb977db KS |
322 | char *path_kill_slashes(char *path) { |
323 | char *f, *t; | |
324 | bool slash = false; | |
325 | ||
326 | /* Removes redundant inner and trailing slashes. Modifies the | |
327 | * passed string in-place. | |
328 | * | |
329 | * ///foo///bar/ becomes /foo/bar | |
330 | */ | |
331 | ||
332 | for (f = path, t = path; *f; f++) { | |
333 | ||
334 | if (*f == '/') { | |
335 | slash = true; | |
336 | continue; | |
337 | } | |
338 | ||
339 | if (slash) { | |
340 | slash = false; | |
341 | *(t++) = '/'; | |
342 | } | |
343 | ||
344 | *(t++) = *f; | |
345 | } | |
346 | ||
347 | /* Special rule, if we are talking of the root directory, a | |
348 | trailing slash is good */ | |
349 | ||
350 | if (t == path && slash) | |
351 | *(t++) = '/'; | |
352 | ||
353 | *t = 0; | |
354 | return path; | |
355 | } | |
356 | ||
424a19f8 | 357 | char* path_startswith(const char *path, const char *prefix) { |
9eb977db KS |
358 | assert(path); |
359 | assert(prefix); | |
360 | ||
361 | if ((path[0] == '/') != (prefix[0] == '/')) | |
424a19f8 | 362 | return NULL; |
9eb977db KS |
363 | |
364 | for (;;) { | |
365 | size_t a, b; | |
366 | ||
367 | path += strspn(path, "/"); | |
368 | prefix += strspn(prefix, "/"); | |
369 | ||
370 | if (*prefix == 0) | |
424a19f8 | 371 | return (char*) path; |
9eb977db KS |
372 | |
373 | if (*path == 0) | |
424a19f8 | 374 | return NULL; |
9eb977db KS |
375 | |
376 | a = strcspn(path, "/"); | |
377 | b = strcspn(prefix, "/"); | |
378 | ||
379 | if (a != b) | |
424a19f8 | 380 | return NULL; |
9eb977db KS |
381 | |
382 | if (memcmp(path, prefix, a) != 0) | |
424a19f8 | 383 | return NULL; |
9eb977db KS |
384 | |
385 | path += a; | |
386 | prefix += b; | |
387 | } | |
388 | } | |
389 | ||
2230852b MS |
390 | int path_compare(const char *a, const char *b) { |
391 | int d; | |
392 | ||
9eb977db KS |
393 | assert(a); |
394 | assert(b); | |
395 | ||
2230852b MS |
396 | /* A relative path and an abolute path must not compare as equal. |
397 | * Which one is sorted before the other does not really matter. | |
398 | * Here a relative path is ordered before an absolute path. */ | |
399 | d = (a[0] == '/') - (b[0] == '/'); | |
373cd63a | 400 | if (d != 0) |
2230852b | 401 | return d; |
9eb977db KS |
402 | |
403 | for (;;) { | |
404 | size_t j, k; | |
405 | ||
406 | a += strspn(a, "/"); | |
407 | b += strspn(b, "/"); | |
408 | ||
409 | if (*a == 0 && *b == 0) | |
2230852b | 410 | return 0; |
9eb977db | 411 | |
2230852b MS |
412 | /* Order prefixes first: "/foo" before "/foo/bar" */ |
413 | if (*a == 0) | |
414 | return -1; | |
415 | if (*b == 0) | |
416 | return 1; | |
9eb977db KS |
417 | |
418 | j = strcspn(a, "/"); | |
419 | k = strcspn(b, "/"); | |
420 | ||
2230852b MS |
421 | /* Alphabetical sort: "/foo/aaa" before "/foo/b" */ |
422 | d = memcmp(a, b, MIN(j, k)); | |
373cd63a | 423 | if (d != 0) |
2230852b | 424 | return (d > 0) - (d < 0); /* sign of d */ |
9eb977db | 425 | |
2230852b MS |
426 | /* Sort "/foo/a" before "/foo/aaa" */ |
427 | d = (j > k) - (j < k); /* sign of (j - k) */ | |
373cd63a | 428 | if (d != 0) |
2230852b | 429 | return d; |
9eb977db KS |
430 | |
431 | a += j; | |
432 | b += k; | |
433 | } | |
434 | } | |
435 | ||
2230852b MS |
436 | bool path_equal(const char *a, const char *b) { |
437 | return path_compare(a, b) == 0; | |
438 | } | |
439 | ||
c78e47a6 MS |
440 | bool path_equal_or_files_same(const char *a, const char *b) { |
441 | return path_equal(a, b) || files_same(a, b) > 0; | |
442 | } | |
443 | ||
0c6ea3a4 ZJS |
444 | char* path_join(const char *root, const char *path, const char *rest) { |
445 | assert(path); | |
446 | ||
447 | if (!isempty(root)) | |
bc854dc7 | 448 | return strjoin(root, endswith(root, "/") ? "" : "/", |
0c6ea3a4 | 449 | path[0] == '/' ? path+1 : path, |
bc854dc7 | 450 | rest ? (endswith(path, "/") ? "" : "/") : NULL, |
0c6ea3a4 ZJS |
451 | rest && rest[0] == '/' ? rest+1 : rest, |
452 | NULL); | |
453 | else | |
454 | return strjoin(path, | |
bc854dc7 | 455 | rest ? (endswith(path, "/") ? "" : "/") : NULL, |
0c6ea3a4 ZJS |
456 | rest && rest[0] == '/' ? rest+1 : rest, |
457 | NULL); | |
458 | } | |
459 | ||
85eca92e LP |
460 | int find_binary(const char *name, char **ret) { |
461 | int last_error, r; | |
462 | const char *p; | |
463 | ||
c9d954b2 | 464 | assert(name); |
4087cb9e | 465 | |
571d0134 | 466 | if (is_path(name)) { |
85eca92e | 467 | if (access(name, X_OK) < 0) |
b972115c ZJS |
468 | return -errno; |
469 | ||
85eca92e | 470 | if (ret) { |
0f474365 LP |
471 | r = path_make_absolute_cwd(name, ret); |
472 | if (r < 0) | |
473 | return r; | |
eb66db55 | 474 | } |
c9d954b2 | 475 | |
c9d954b2 | 476 | return 0; |
85eca92e | 477 | } |
c9d954b2 | 478 | |
85eca92e LP |
479 | /** |
480 | * Plain getenv, not secure_getenv, because we want | |
481 | * to actually allow the user to pick the binary. | |
482 | */ | |
483 | p = getenv("PATH"); | |
484 | if (!p) | |
485 | p = DEFAULT_PATH; | |
486 | ||
487 | last_error = -ENOENT; | |
488 | ||
489 | for (;;) { | |
490 | _cleanup_free_ char *j = NULL, *element = NULL; | |
491 | ||
492 | r = extract_first_word(&p, &element, ":", EXTRACT_RELAX|EXTRACT_DONT_COALESCE_SEPARATORS); | |
493 | if (r < 0) | |
494 | return r; | |
495 | if (r == 0) | |
496 | break; | |
497 | ||
0f474365 LP |
498 | if (!path_is_absolute(element)) |
499 | continue; | |
500 | ||
85eca92e LP |
501 | j = strjoin(element, "/", name, NULL); |
502 | if (!j) | |
503 | return -ENOMEM; | |
504 | ||
505 | if (access(j, X_OK) >= 0) { | |
506 | /* Found it! */ | |
c9d954b2 | 507 | |
85eca92e LP |
508 | if (ret) { |
509 | *ret = path_kill_slashes(j); | |
510 | j = NULL; | |
eb66db55 | 511 | } |
c9d954b2 ZJS |
512 | |
513 | return 0; | |
514 | } | |
515 | ||
85eca92e | 516 | last_error = -errno; |
c9d954b2 | 517 | } |
85eca92e LP |
518 | |
519 | return last_error; | |
c9d954b2 | 520 | } |
8e184852 | 521 | |
2ad8416d | 522 | bool paths_check_timestamp(const char* const* paths, usec_t *timestamp, bool update) { |
8e184852 | 523 | bool changed = false; |
2ad8416d | 524 | const char* const* i; |
8e184852 | 525 | |
97f2d76d TG |
526 | assert(timestamp); |
527 | ||
8e184852 | 528 | if (paths == NULL) |
4087cb9e | 529 | return false; |
8e184852 | 530 | |
4087cb9e | 531 | STRV_FOREACH(i, paths) { |
8e184852 | 532 | struct stat stats; |
4087cb9e | 533 | usec_t u; |
8e184852 | 534 | |
4087cb9e | 535 | if (stat(*i, &stats) < 0) |
8e184852 TG |
536 | continue; |
537 | ||
4087cb9e LP |
538 | u = timespec_load(&stats.st_mtim); |
539 | ||
97f2d76d | 540 | /* first check */ |
4087cb9e | 541 | if (*timestamp >= u) |
8e184852 TG |
542 | continue; |
543 | ||
9f6445e3 | 544 | log_debug("timestamp of '%s' changed", *i); |
8e184852 TG |
545 | |
546 | /* update timestamp */ | |
4087cb9e LP |
547 | if (update) { |
548 | *timestamp = u; | |
549 | changed = true; | |
550 | } else | |
551 | return true; | |
8e184852 | 552 | } |
4087cb9e | 553 | |
8e184852 TG |
554 | return changed; |
555 | } | |
eb66db55 | 556 | |
5bcd08db | 557 | static int binary_is_good(const char *binary) { |
571d0134 | 558 | _cleanup_free_ char *p = NULL, *d = NULL; |
571d0134 | 559 | int r; |
eb66db55 | 560 | |
85eca92e LP |
561 | r = find_binary(binary, &p); |
562 | if (r == -ENOENT) | |
563 | return 0; | |
571d0134 LP |
564 | if (r < 0) |
565 | return r; | |
566 | ||
061df014 | 567 | /* An fsck that is linked to /bin/true is a non-existent |
571d0134 LP |
568 | * fsck */ |
569 | ||
570 | r = readlink_malloc(p, &d); | |
85eca92e LP |
571 | if (r == -EINVAL) /* not a symlink */ |
572 | return 1; | |
573 | if (r < 0) | |
574 | return r; | |
571d0134 | 575 | |
85eca92e LP |
576 | return !path_equal(d, "true") && |
577 | !path_equal(d, "/bin/true") && | |
578 | !path_equal(d, "/usr/bin/true") && | |
579 | !path_equal(d, "/dev/null"); | |
eb66db55 | 580 | } |
1d13f648 | 581 | |
5bcd08db LP |
582 | int fsck_exists(const char *fstype) { |
583 | const char *checker; | |
584 | ||
85eca92e | 585 | assert(fstype); |
5bcd08db | 586 | |
85eca92e LP |
587 | if (streq(fstype, "auto")) |
588 | return -EINVAL; | |
589 | ||
590 | checker = strjoina("fsck.", fstype); | |
5bcd08db LP |
591 | return binary_is_good(checker); |
592 | } | |
593 | ||
594 | int mkfs_exists(const char *fstype) { | |
595 | const char *mkfs; | |
596 | ||
85eca92e | 597 | assert(fstype); |
5bcd08db | 598 | |
85eca92e LP |
599 | if (streq(fstype, "auto")) |
600 | return -EINVAL; | |
601 | ||
602 | mkfs = strjoina("mkfs.", fstype); | |
5bcd08db LP |
603 | return binary_is_good(mkfs); |
604 | } | |
605 | ||
1d13f648 LP |
606 | char *prefix_root(const char *root, const char *path) { |
607 | char *n, *p; | |
608 | size_t l; | |
609 | ||
610 | /* If root is passed, prefixes path with it. Otherwise returns | |
611 | * it as is. */ | |
612 | ||
613 | assert(path); | |
614 | ||
615 | /* First, drop duplicate prefixing slashes from the path */ | |
616 | while (path[0] == '/' && path[1] == '/') | |
617 | path++; | |
618 | ||
619 | if (isempty(root) || path_equal(root, "/")) | |
620 | return strdup(path); | |
621 | ||
622 | l = strlen(root) + 1 + strlen(path) + 1; | |
623 | ||
624 | n = new(char, l); | |
625 | if (!n) | |
626 | return NULL; | |
627 | ||
628 | p = stpcpy(n, root); | |
629 | ||
630 | while (p > n && p[-1] == '/') | |
631 | p--; | |
632 | ||
633 | if (path[0] != '/') | |
634 | *(p++) = '/'; | |
635 | ||
636 | strcpy(p, path); | |
637 | return n; | |
638 | } | |
0f03c2a4 LP |
639 | |
640 | int parse_path_argument_and_warn(const char *path, bool suppress_root, char **arg) { | |
641 | char *p; | |
642 | int r; | |
643 | ||
644 | /* | |
645 | * This function is intended to be used in command line | |
646 | * parsers, to handle paths that are passed in. It makes the | |
647 | * path absolute, and reduces it to NULL if omitted or | |
648 | * root (the latter optionally). | |
649 | * | |
650 | * NOTE THAT THIS WILL FREE THE PREVIOUS ARGUMENT POINTER ON | |
651 | * SUCCESS! Hence, do not pass in uninitialized pointers. | |
652 | */ | |
653 | ||
654 | if (isempty(path)) { | |
655 | *arg = mfree(*arg); | |
656 | return 0; | |
657 | } | |
658 | ||
659 | r = path_make_absolute_cwd(path, &p); | |
660 | if (r < 0) | |
661 | return log_error_errno(r, "Failed to parse path \"%s\" and make it absolute: %m", path); | |
662 | ||
663 | path_kill_slashes(p); | |
664 | if (suppress_root && path_equal(p, "/")) | |
665 | p = mfree(p); | |
666 | ||
667 | free(*arg); | |
668 | *arg = p; | |
669 | return 0; | |
670 | } | |
5f311f8c LP |
671 | |
672 | char* dirname_malloc(const char *path) { | |
673 | char *d, *dir, *dir2; | |
674 | ||
675 | assert(path); | |
676 | ||
677 | d = strdup(path); | |
678 | if (!d) | |
679 | return NULL; | |
680 | ||
681 | dir = dirname(d); | |
682 | assert(dir); | |
683 | ||
684 | if (dir == d) | |
685 | return d; | |
686 | ||
687 | dir2 = strdup(dir); | |
688 | free(d); | |
689 | ||
690 | return dir2; | |
691 | } | |
bb15fafe LP |
692 | |
693 | bool filename_is_valid(const char *p) { | |
694 | const char *e; | |
695 | ||
696 | if (isempty(p)) | |
697 | return false; | |
698 | ||
699 | if (streq(p, ".")) | |
700 | return false; | |
701 | ||
702 | if (streq(p, "..")) | |
703 | return false; | |
704 | ||
705 | e = strchrnul(p, '/'); | |
706 | if (*e != 0) | |
707 | return false; | |
708 | ||
709 | if (e - p > FILENAME_MAX) | |
710 | return false; | |
711 | ||
712 | return true; | |
713 | } | |
714 | ||
715 | bool path_is_safe(const char *p) { | |
716 | ||
717 | if (isempty(p)) | |
718 | return false; | |
719 | ||
720 | if (streq(p, "..") || startswith(p, "../") || endswith(p, "/..") || strstr(p, "/../")) | |
721 | return false; | |
722 | ||
723 | if (strlen(p)+1 > PATH_MAX) | |
724 | return false; | |
725 | ||
726 | /* The following two checks are not really dangerous, but hey, they still are confusing */ | |
727 | if (streq(p, ".") || startswith(p, "./") || endswith(p, "/.") || strstr(p, "/./")) | |
728 | return false; | |
729 | ||
730 | if (strstr(p, "//")) | |
731 | return false; | |
732 | ||
733 | return true; | |
734 | } | |
a0956174 LP |
735 | |
736 | char *file_in_same_dir(const char *path, const char *filename) { | |
737 | char *e, *ret; | |
738 | size_t k; | |
739 | ||
740 | assert(path); | |
741 | assert(filename); | |
742 | ||
743 | /* This removes the last component of path and appends | |
744 | * filename, unless the latter is absolute anyway or the | |
745 | * former isn't */ | |
746 | ||
747 | if (path_is_absolute(filename)) | |
748 | return strdup(filename); | |
749 | ||
750 | e = strrchr(path, '/'); | |
751 | if (!e) | |
752 | return strdup(filename); | |
753 | ||
754 | k = strlen(filename); | |
755 | ret = new(char, (e + 1 - path) + k + 1); | |
756 | if (!ret) | |
757 | return NULL; | |
758 | ||
759 | memcpy(mempcpy(ret, path, e + 1 - path), filename, k + 1); | |
760 | return ret; | |
761 | } | |
762 | ||
763 | bool hidden_file_allow_backup(const char *filename) { | |
764 | assert(filename); | |
765 | ||
766 | return | |
767 | filename[0] == '.' || | |
768 | streq(filename, "lost+found") || | |
769 | streq(filename, "aquota.user") || | |
770 | streq(filename, "aquota.group") || | |
771 | endswith(filename, ".rpmnew") || | |
772 | endswith(filename, ".rpmsave") || | |
773 | endswith(filename, ".rpmorig") || | |
774 | endswith(filename, ".dpkg-old") || | |
775 | endswith(filename, ".dpkg-new") || | |
776 | endswith(filename, ".dpkg-tmp") || | |
777 | endswith(filename, ".dpkg-dist") || | |
778 | endswith(filename, ".dpkg-bak") || | |
779 | endswith(filename, ".dpkg-backup") || | |
780 | endswith(filename, ".dpkg-remove") || | |
781 | endswith(filename, ".swp"); | |
782 | } | |
783 | ||
784 | bool hidden_file(const char *filename) { | |
785 | assert(filename); | |
786 | ||
787 | if (endswith(filename, "~")) | |
788 | return true; | |
789 | ||
790 | return hidden_file_allow_backup(filename); | |
791 | } | |
792 | ||
793 | bool is_device_path(const char *path) { | |
794 | ||
795 | /* Returns true on paths that refer to a device, either in | |
796 | * sysfs or in /dev */ | |
797 | ||
798 | return | |
799 | path_startswith(path, "/dev/") || | |
800 | path_startswith(path, "/sys/"); | |
801 | } |