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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 KS |
22 | #include <string.h> |
23 | #include <unistd.h> | |
24 | #include <errno.h> | |
25 | #include <stdlib.h> | |
9eb977db KS |
26 | #include <stdio.h> |
27 | #include <fcntl.h> | |
9eb977db KS |
28 | #include <sys/statvfs.h> |
29 | ||
30 | #include "macro.h" | |
31 | #include "util.h" | |
32 | #include "log.h" | |
33 | #include "strv.h" | |
34 | #include "path-util.h" | |
a8348796 | 35 | #include "missing.h" |
9eb977db KS |
36 | |
37 | bool path_is_absolute(const char *p) { | |
38 | return p[0] == '/'; | |
39 | } | |
40 | ||
41 | bool is_path(const char *p) { | |
42 | return !!strchr(p, '/'); | |
43 | } | |
44 | ||
9eb977db KS |
45 | int path_get_parent(const char *path, char **_r) { |
46 | const char *e, *a = NULL, *b = NULL, *p; | |
47 | char *r; | |
48 | bool slash = false; | |
49 | ||
50 | assert(path); | |
51 | assert(_r); | |
52 | ||
53 | if (!*path) | |
54 | return -EINVAL; | |
55 | ||
56 | for (e = path; *e; e++) { | |
57 | ||
58 | if (!slash && *e == '/') { | |
59 | a = b; | |
60 | b = e; | |
61 | slash = true; | |
62 | } else if (slash && *e != '/') | |
63 | slash = false; | |
64 | } | |
65 | ||
66 | if (*(e-1) == '/') | |
67 | p = a; | |
68 | else | |
69 | p = b; | |
70 | ||
71 | if (!p) | |
72 | return -EINVAL; | |
73 | ||
74 | if (p == path) | |
75 | r = strdup("/"); | |
76 | else | |
77 | r = strndup(path, p-path); | |
78 | ||
79 | if (!r) | |
80 | return -ENOMEM; | |
81 | ||
82 | *_r = r; | |
83 | return 0; | |
84 | } | |
85 | ||
86 | char **path_split_and_make_absolute(const char *p) { | |
87 | char **l; | |
88 | assert(p); | |
89 | ||
116cc028 ZJS |
90 | l = strv_split(p, ":"); |
91 | if (!l) | |
9eb977db KS |
92 | return NULL; |
93 | ||
94 | if (!path_strv_make_absolute_cwd(l)) { | |
95 | strv_free(l); | |
96 | return NULL; | |
97 | } | |
98 | ||
99 | return l; | |
100 | } | |
101 | ||
102 | char *path_make_absolute(const char *p, const char *prefix) { | |
103 | assert(p); | |
104 | ||
105 | /* Makes every item in the list an absolute path by prepending | |
106 | * the prefix, if specified and necessary */ | |
107 | ||
108 | if (path_is_absolute(p) || !prefix) | |
109 | return strdup(p); | |
110 | ||
b7def684 | 111 | return strjoin(prefix, "/", p, NULL); |
9eb977db KS |
112 | } |
113 | ||
114 | char *path_make_absolute_cwd(const char *p) { | |
116cc028 | 115 | _cleanup_free_ char *cwd = NULL; |
9eb977db KS |
116 | |
117 | assert(p); | |
118 | ||
119 | /* Similar to path_make_absolute(), but prefixes with the | |
120 | * current working directory. */ | |
121 | ||
122 | if (path_is_absolute(p)) | |
123 | return strdup(p); | |
124 | ||
91a6489d LP |
125 | cwd = get_current_dir_name(); |
126 | if (!cwd) | |
9eb977db KS |
127 | return NULL; |
128 | ||
db594aef | 129 | return strjoin(cwd, "/", p, NULL); |
9eb977db KS |
130 | } |
131 | ||
7cb9c51c TK |
132 | int path_make_relative(const char *from_dir, const char *to_path, char **_r) { |
133 | char *r, *p; | |
134 | unsigned n_parents; | |
7cb9c51c TK |
135 | |
136 | assert(from_dir); | |
137 | assert(to_path); | |
138 | assert(_r); | |
139 | ||
140 | /* Strips the common part, and adds ".." elements as necessary. */ | |
141 | ||
142 | if (!path_is_absolute(from_dir)) | |
143 | return -EINVAL; | |
144 | ||
145 | if (!path_is_absolute(to_path)) | |
146 | return -EINVAL; | |
147 | ||
148 | /* Skip the common part. */ | |
149 | for (;;) { | |
150 | size_t a; | |
151 | size_t b; | |
152 | ||
153 | from_dir += strspn(from_dir, "/"); | |
154 | to_path += strspn(to_path, "/"); | |
155 | ||
156 | if (!*from_dir) { | |
157 | if (!*to_path) | |
158 | /* from_dir equals to_path. */ | |
159 | r = strdup("."); | |
160 | else | |
161 | /* from_dir is a parent directory of to_path. */ | |
162 | r = strdup(to_path); | |
163 | ||
164 | if (!r) | |
165 | return -ENOMEM; | |
166 | ||
5216f599 TK |
167 | path_kill_slashes(r); |
168 | ||
7cb9c51c TK |
169 | *_r = r; |
170 | return 0; | |
171 | } | |
172 | ||
173 | if (!*to_path) | |
174 | break; | |
175 | ||
176 | a = strcspn(from_dir, "/"); | |
177 | b = strcspn(to_path, "/"); | |
178 | ||
179 | if (a != b) | |
180 | break; | |
181 | ||
182 | if (memcmp(from_dir, to_path, a) != 0) | |
183 | break; | |
184 | ||
185 | from_dir += a; | |
186 | to_path += b; | |
187 | } | |
188 | ||
189 | /* If we're here, then "from_dir" has one or more elements that need to | |
190 | * be replaced with "..". */ | |
191 | ||
192 | /* Count the number of necessary ".." elements. */ | |
193 | for (n_parents = 0;;) { | |
194 | from_dir += strspn(from_dir, "/"); | |
195 | ||
196 | if (!*from_dir) | |
197 | break; | |
198 | ||
199 | from_dir += strcspn(from_dir, "/"); | |
200 | n_parents++; | |
201 | } | |
202 | ||
5216f599 | 203 | r = malloc(n_parents * 3 + strlen(to_path) + 1); |
7cb9c51c TK |
204 | if (!r) |
205 | return -ENOMEM; | |
206 | ||
207 | for (p = r; n_parents > 0; n_parents--, p += 3) | |
208 | memcpy(p, "../", 3); | |
209 | ||
5216f599 TK |
210 | strcpy(p, to_path); |
211 | path_kill_slashes(r); | |
7cb9c51c TK |
212 | |
213 | *_r = r; | |
214 | return 0; | |
215 | } | |
216 | ||
9eb977db KS |
217 | char **path_strv_make_absolute_cwd(char **l) { |
218 | char **s; | |
219 | ||
220 | /* Goes through every item in the string list and makes it | |
221 | * absolute. This works in place and won't rollback any | |
222 | * changes on failure. */ | |
223 | ||
224 | STRV_FOREACH(s, l) { | |
225 | char *t; | |
226 | ||
116cc028 ZJS |
227 | t = path_make_absolute_cwd(*s); |
228 | if (!t) | |
9eb977db KS |
229 | return NULL; |
230 | ||
231 | free(*s); | |
232 | *s = t; | |
233 | } | |
234 | ||
235 | return l; | |
236 | } | |
237 | ||
7d8da2c9 | 238 | char **path_strv_resolve(char **l, const char *prefix) { |
9eb977db KS |
239 | char **s; |
240 | unsigned k = 0; | |
241 | bool enomem = false; | |
242 | ||
243 | if (strv_isempty(l)) | |
244 | return l; | |
245 | ||
246 | /* Goes through every item in the string list and canonicalize | |
247 | * the path. This works in place and won't rollback any | |
248 | * changes on failure. */ | |
249 | ||
250 | STRV_FOREACH(s, l) { | |
251 | char *t, *u; | |
12ed81d9 | 252 | _cleanup_free_ char *orig = NULL; |
9eb977db | 253 | |
12ed81d9 ZJS |
254 | if (!path_is_absolute(*s)) { |
255 | free(*s); | |
9eb977db | 256 | continue; |
12ed81d9 | 257 | } |
112cfb18 MM |
258 | |
259 | if (prefix) { | |
12ed81d9 ZJS |
260 | orig = *s; |
261 | t = strappend(prefix, orig); | |
112cfb18 MM |
262 | if (!t) { |
263 | enomem = true; | |
264 | continue; | |
265 | } | |
12ed81d9 | 266 | } else |
112cfb18 | 267 | t = *s; |
9eb977db KS |
268 | |
269 | errno = 0; | |
270 | u = canonicalize_file_name(t); | |
9eb977db | 271 | if (!u) { |
12ed81d9 ZJS |
272 | if (errno == ENOENT) { |
273 | if (prefix) { | |
274 | u = orig; | |
275 | orig = NULL; | |
276 | free(t); | |
277 | } else | |
278 | u = t; | |
279 | } else { | |
874310b7 | 280 | free(t); |
112cfb18 | 281 | if (errno == ENOMEM || errno == 0) |
874310b7 ZJS |
282 | enomem = true; |
283 | ||
284 | continue; | |
285 | } | |
12ed81d9 ZJS |
286 | } else if (prefix) { |
287 | char *x; | |
288 | ||
289 | free(t); | |
290 | x = path_startswith(u, prefix); | |
291 | if (x) { | |
292 | /* restore the slash if it was lost */ | |
293 | if (!startswith(x, "/")) | |
294 | *(--x) = '/'; | |
295 | ||
296 | t = strdup(x); | |
297 | free(u); | |
298 | if (!t) { | |
299 | enomem = true; | |
300 | continue; | |
301 | } | |
302 | u = t; | |
303 | } else { | |
304 | /* canonicalized path goes outside of | |
305 | * prefix, keep the original path instead */ | |
3542eac7 | 306 | free(u); |
12ed81d9 ZJS |
307 | u = orig; |
308 | orig = NULL; | |
309 | } | |
91a6489d LP |
310 | } else |
311 | free(t); | |
9eb977db KS |
312 | |
313 | l[k++] = u; | |
314 | } | |
315 | ||
316 | l[k] = NULL; | |
317 | ||
318 | if (enomem) | |
319 | return NULL; | |
320 | ||
321 | return l; | |
322 | } | |
323 | ||
7d8da2c9 | 324 | char **path_strv_resolve_uniq(char **l, const char *prefix) { |
112cfb18 | 325 | |
fabe5c0e LP |
326 | if (strv_isempty(l)) |
327 | return l; | |
328 | ||
7d8da2c9 | 329 | if (!path_strv_resolve(l, prefix)) |
fabe5c0e LP |
330 | return NULL; |
331 | ||
332 | return strv_uniq(l); | |
333 | } | |
334 | ||
9eb977db KS |
335 | char *path_kill_slashes(char *path) { |
336 | char *f, *t; | |
337 | bool slash = false; | |
338 | ||
339 | /* Removes redundant inner and trailing slashes. Modifies the | |
340 | * passed string in-place. | |
341 | * | |
342 | * ///foo///bar/ becomes /foo/bar | |
343 | */ | |
344 | ||
345 | for (f = path, t = path; *f; f++) { | |
346 | ||
347 | if (*f == '/') { | |
348 | slash = true; | |
349 | continue; | |
350 | } | |
351 | ||
352 | if (slash) { | |
353 | slash = false; | |
354 | *(t++) = '/'; | |
355 | } | |
356 | ||
357 | *(t++) = *f; | |
358 | } | |
359 | ||
360 | /* Special rule, if we are talking of the root directory, a | |
361 | trailing slash is good */ | |
362 | ||
363 | if (t == path && slash) | |
364 | *(t++) = '/'; | |
365 | ||
366 | *t = 0; | |
367 | return path; | |
368 | } | |
369 | ||
424a19f8 | 370 | char* path_startswith(const char *path, const char *prefix) { |
9eb977db KS |
371 | assert(path); |
372 | assert(prefix); | |
373 | ||
374 | if ((path[0] == '/') != (prefix[0] == '/')) | |
424a19f8 | 375 | return NULL; |
9eb977db KS |
376 | |
377 | for (;;) { | |
378 | size_t a, b; | |
379 | ||
380 | path += strspn(path, "/"); | |
381 | prefix += strspn(prefix, "/"); | |
382 | ||
383 | if (*prefix == 0) | |
424a19f8 | 384 | return (char*) path; |
9eb977db KS |
385 | |
386 | if (*path == 0) | |
424a19f8 | 387 | return NULL; |
9eb977db KS |
388 | |
389 | a = strcspn(path, "/"); | |
390 | b = strcspn(prefix, "/"); | |
391 | ||
392 | if (a != b) | |
424a19f8 | 393 | return NULL; |
9eb977db KS |
394 | |
395 | if (memcmp(path, prefix, a) != 0) | |
424a19f8 | 396 | return NULL; |
9eb977db KS |
397 | |
398 | path += a; | |
399 | prefix += b; | |
400 | } | |
401 | } | |
402 | ||
403 | bool path_equal(const char *a, const char *b) { | |
404 | assert(a); | |
405 | assert(b); | |
406 | ||
407 | if ((a[0] == '/') != (b[0] == '/')) | |
408 | return false; | |
409 | ||
410 | for (;;) { | |
411 | size_t j, k; | |
412 | ||
413 | a += strspn(a, "/"); | |
414 | b += strspn(b, "/"); | |
415 | ||
416 | if (*a == 0 && *b == 0) | |
417 | return true; | |
418 | ||
419 | if (*a == 0 || *b == 0) | |
420 | return false; | |
421 | ||
422 | j = strcspn(a, "/"); | |
423 | k = strcspn(b, "/"); | |
424 | ||
425 | if (j != k) | |
426 | return false; | |
427 | ||
428 | if (memcmp(a, b, j) != 0) | |
429 | return false; | |
430 | ||
431 | a += j; | |
432 | b += k; | |
433 | } | |
434 | } | |
435 | ||
c78e47a6 MS |
436 | bool path_equal_or_files_same(const char *a, const char *b) { |
437 | return path_equal(a, b) || files_same(a, b) > 0; | |
438 | } | |
439 | ||
0c6ea3a4 ZJS |
440 | char* path_join(const char *root, const char *path, const char *rest) { |
441 | assert(path); | |
442 | ||
443 | if (!isempty(root)) | |
bc854dc7 | 444 | return strjoin(root, endswith(root, "/") ? "" : "/", |
0c6ea3a4 | 445 | path[0] == '/' ? path+1 : path, |
bc854dc7 | 446 | rest ? (endswith(path, "/") ? "" : "/") : NULL, |
0c6ea3a4 ZJS |
447 | rest && rest[0] == '/' ? rest+1 : rest, |
448 | NULL); | |
449 | else | |
450 | return strjoin(path, | |
bc854dc7 | 451 | rest ? (endswith(path, "/") ? "" : "/") : NULL, |
0c6ea3a4 ZJS |
452 | rest && rest[0] == '/' ? rest+1 : rest, |
453 | NULL); | |
454 | } | |
455 | ||
9eb977db | 456 | int path_is_mount_point(const char *t, bool allow_symlink) { |
21749924 | 457 | |
2695c5c4 | 458 | union file_handle_union h = FILE_HANDLE_INIT; |
e40872fc | 459 | int mount_id = -1, mount_id_parent = -1; |
1640a0b6 | 460 | struct stat a, b; |
21749924 | 461 | int r; |
27cc6f16 | 462 | _cleanup_close_ int fd = -1; |
6feeeab0 | 463 | bool nosupp = false; |
9eb977db | 464 | |
cde9cb34 LP |
465 | /* We are not actually interested in the file handles, but |
466 | * name_to_handle_at() also passes us the mount ID, hence use | |
467 | * it but throw the handle away */ | |
468 | ||
469 | if (path_equal(t, "/")) | |
470 | return 1; | |
9eb977db | 471 | |
27cc6f16 HH |
472 | fd = openat(AT_FDCWD, t, O_RDONLY|O_NONBLOCK|O_DIRECTORY|O_CLOEXEC|(allow_symlink ? 0 : O_PATH)); |
473 | if (fd < 0) { | |
474 | if (errno == ENOENT) | |
475 | return 0; | |
476 | ||
477 | return -errno; | |
478 | } | |
479 | ||
480 | r = name_to_handle_at(fd, "", &h.handle, &mount_id, AT_EMPTY_PATH); | |
9eb977db | 481 | if (r < 0) { |
e40872fc DR |
482 | if (errno == ENOSYS) |
483 | /* This kernel does not support name_to_handle_at() | |
484 | * fall back to the traditional stat() logic. */ | |
485 | goto fallback; | |
486 | else if (errno == EOPNOTSUPP) | |
fa125f4e | 487 | /* This kernel or file system does not support |
1640a0b6 LP |
488 | * name_to_handle_at(), hence fallback to the |
489 | * traditional stat() logic */ | |
6feeeab0 ZJS |
490 | nosupp = true; |
491 | else if (errno == ENOENT) | |
9eb977db | 492 | return 0; |
6feeeab0 ZJS |
493 | else |
494 | return -errno; | |
9eb977db KS |
495 | } |
496 | ||
9eb977db | 497 | |
21749924 | 498 | h.handle.handle_bytes = MAX_HANDLE_SZ; |
27cc6f16 | 499 | r = name_to_handle_at(fd, "..", &h.handle, &mount_id_parent, 0); |
6feeeab0 | 500 | if (r < 0) |
21749924 | 501 | if (errno == EOPNOTSUPP) |
6feeeab0 ZJS |
502 | if (nosupp) |
503 | /* Neither parent nor child do name_to_handle_at()? | |
504 | We have no choice but to fall back. */ | |
505 | goto fallback; | |
506 | else | |
507 | /* The parent can't do name_to_handle_at() but | |
508 | * the directory we are interested in can? | |
509 | * Or the other way around? | |
510 | * If so, it must be a mount point. */ | |
511 | return 1; | |
512 | else | |
513 | return -errno; | |
514 | else | |
515 | return mount_id != mount_id_parent; | |
1640a0b6 LP |
516 | |
517 | fallback: | |
27cc6f16 | 518 | r = fstatat(fd, "", &a, AT_EMPTY_PATH); |
1640a0b6 | 519 | |
8ac75493 MM |
520 | if (r < 0) { |
521 | if (errno == ENOENT) | |
522 | return 0; | |
523 | ||
9eb977db | 524 | return -errno; |
8ac75493 | 525 | } |
9eb977db | 526 | |
cde9cb34 | 527 | |
27cc6f16 | 528 | r = fstatat(fd, "..", &b, 0); |
1640a0b6 LP |
529 | if (r < 0) |
530 | return -errno; | |
531 | ||
532 | return a.st_dev != b.st_dev; | |
9eb977db KS |
533 | } |
534 | ||
535 | int path_is_read_only_fs(const char *path) { | |
536 | struct statvfs st; | |
537 | ||
538 | assert(path); | |
539 | ||
540 | if (statvfs(path, &st) < 0) | |
541 | return -errno; | |
542 | ||
70421bdc LP |
543 | if (st.f_flag & ST_RDONLY) |
544 | return true; | |
545 | ||
546 | /* On NFS, statvfs() might not reflect whether we can actually | |
547 | * write to the remote share. Let's try again with | |
548 | * access(W_OK) which is more reliable, at least sometimes. */ | |
549 | if (access(path, W_OK) < 0 && errno == EROFS) | |
550 | return true; | |
551 | ||
552 | return false; | |
9eb977db | 553 | } |
66060897 LP |
554 | |
555 | int path_is_os_tree(const char *path) { | |
556 | char *p; | |
557 | int r; | |
558 | ||
5ae4d543 | 559 | /* We use /usr/lib/os-release as flag file if something is an OS */ |
63c372cb | 560 | p = strjoina(path, "/usr/lib/os-release"); |
5ae4d543 LP |
561 | r = access(p, F_OK); |
562 | ||
563 | if (r >= 0) | |
564 | return 1; | |
66060897 | 565 | |
5ae4d543 | 566 | /* Also check for the old location in /etc, just in case. */ |
63c372cb | 567 | p = strjoina(path, "/etc/os-release"); |
66060897 LP |
568 | r = access(p, F_OK); |
569 | ||
5ae4d543 | 570 | return r >= 0; |
66060897 | 571 | } |
c9d954b2 | 572 | |
b63bd109 | 573 | int find_binary(const char *name, bool local, char **filename) { |
c9d954b2 | 574 | assert(name); |
4087cb9e | 575 | |
571d0134 | 576 | if (is_path(name)) { |
b63bd109 | 577 | if (local && access(name, X_OK) < 0) |
b972115c ZJS |
578 | return -errno; |
579 | ||
eb66db55 MG |
580 | if (filename) { |
581 | char *p; | |
c9d954b2 | 582 | |
b972115c | 583 | p = path_make_absolute_cwd(name); |
eb66db55 MG |
584 | if (!p) |
585 | return -ENOMEM; | |
b972115c | 586 | |
eb66db55 MG |
587 | *filename = p; |
588 | } | |
c9d954b2 | 589 | |
c9d954b2 ZJS |
590 | return 0; |
591 | } else { | |
592 | const char *path; | |
a2a5291b | 593 | const char *word, *state; |
c9d954b2 ZJS |
594 | size_t l; |
595 | ||
596 | /** | |
597 | * Plain getenv, not secure_getenv, because we want | |
598 | * to actually allow the user to pick the binary. | |
599 | */ | |
600 | path = getenv("PATH"); | |
601 | if (!path) | |
602 | path = DEFAULT_PATH; | |
603 | ||
a2a5291b | 604 | FOREACH_WORD_SEPARATOR(word, l, path, ":", state) { |
eb66db55 | 605 | _cleanup_free_ char *p = NULL; |
c9d954b2 | 606 | |
a2a5291b | 607 | if (asprintf(&p, "%.*s/%s", (int) l, word, name) < 0) |
c9d954b2 ZJS |
608 | return -ENOMEM; |
609 | ||
eb66db55 | 610 | if (access(p, X_OK) < 0) |
c9d954b2 | 611 | continue; |
c9d954b2 | 612 | |
eb66db55 | 613 | if (filename) { |
dbb9401d | 614 | *filename = path_kill_slashes(p); |
eb66db55 MG |
615 | p = NULL; |
616 | } | |
c9d954b2 ZJS |
617 | |
618 | return 0; | |
619 | } | |
620 | ||
621 | return -ENOENT; | |
622 | } | |
623 | } | |
8e184852 | 624 | |
2ad8416d | 625 | bool paths_check_timestamp(const char* const* paths, usec_t *timestamp, bool update) { |
8e184852 | 626 | bool changed = false; |
2ad8416d | 627 | const char* const* i; |
8e184852 | 628 | |
97f2d76d TG |
629 | assert(timestamp); |
630 | ||
8e184852 | 631 | if (paths == NULL) |
4087cb9e | 632 | return false; |
8e184852 | 633 | |
4087cb9e | 634 | STRV_FOREACH(i, paths) { |
8e184852 | 635 | struct stat stats; |
4087cb9e | 636 | usec_t u; |
8e184852 | 637 | |
4087cb9e | 638 | if (stat(*i, &stats) < 0) |
8e184852 TG |
639 | continue; |
640 | ||
4087cb9e LP |
641 | u = timespec_load(&stats.st_mtim); |
642 | ||
97f2d76d | 643 | /* first check */ |
4087cb9e | 644 | if (*timestamp >= u) |
8e184852 TG |
645 | continue; |
646 | ||
9f6445e3 | 647 | log_debug("timestamp of '%s' changed", *i); |
8e184852 TG |
648 | |
649 | /* update timestamp */ | |
4087cb9e LP |
650 | if (update) { |
651 | *timestamp = u; | |
652 | changed = true; | |
653 | } else | |
654 | return true; | |
8e184852 | 655 | } |
4087cb9e | 656 | |
8e184852 TG |
657 | return changed; |
658 | } | |
eb66db55 MG |
659 | |
660 | int fsck_exists(const char *fstype) { | |
571d0134 | 661 | _cleanup_free_ char *p = NULL, *d = NULL; |
eb66db55 | 662 | const char *checker; |
571d0134 | 663 | int r; |
eb66db55 | 664 | |
63c372cb | 665 | checker = strjoina("fsck.", fstype); |
571d0134 | 666 | |
b63bd109 | 667 | r = find_binary(checker, true, &p); |
571d0134 LP |
668 | if (r < 0) |
669 | return r; | |
670 | ||
061df014 | 671 | /* An fsck that is linked to /bin/true is a non-existent |
571d0134 LP |
672 | * fsck */ |
673 | ||
674 | r = readlink_malloc(p, &d); | |
675 | if (r >= 0 && | |
676 | (path_equal(d, "/bin/true") || | |
677 | path_equal(d, "/usr/bin/true") || | |
678 | path_equal(d, "/dev/null"))) | |
679 | return -ENOENT; | |
680 | ||
681 | return 0; | |
eb66db55 | 682 | } |