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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 | ||
22 | #include <assert.h> | |
23 | #include <string.h> | |
24 | #include <unistd.h> | |
25 | #include <errno.h> | |
26 | #include <stdlib.h> | |
27 | #include <signal.h> | |
28 | #include <stdio.h> | |
29 | #include <fcntl.h> | |
30 | #include <dirent.h> | |
31 | #include <sys/statvfs.h> | |
32 | ||
33 | #include "macro.h" | |
34 | #include "util.h" | |
35 | #include "log.h" | |
36 | #include "strv.h" | |
37 | #include "path-util.h" | |
a8348796 | 38 | #include "missing.h" |
9eb977db KS |
39 | |
40 | bool path_is_absolute(const char *p) { | |
41 | return p[0] == '/'; | |
42 | } | |
43 | ||
44 | bool is_path(const char *p) { | |
45 | return !!strchr(p, '/'); | |
46 | } | |
47 | ||
9eb977db KS |
48 | int path_get_parent(const char *path, char **_r) { |
49 | const char *e, *a = NULL, *b = NULL, *p; | |
50 | char *r; | |
51 | bool slash = false; | |
52 | ||
53 | assert(path); | |
54 | assert(_r); | |
55 | ||
56 | if (!*path) | |
57 | return -EINVAL; | |
58 | ||
59 | for (e = path; *e; e++) { | |
60 | ||
61 | if (!slash && *e == '/') { | |
62 | a = b; | |
63 | b = e; | |
64 | slash = true; | |
65 | } else if (slash && *e != '/') | |
66 | slash = false; | |
67 | } | |
68 | ||
69 | if (*(e-1) == '/') | |
70 | p = a; | |
71 | else | |
72 | p = b; | |
73 | ||
74 | if (!p) | |
75 | return -EINVAL; | |
76 | ||
77 | if (p == path) | |
78 | r = strdup("/"); | |
79 | else | |
80 | r = strndup(path, p-path); | |
81 | ||
82 | if (!r) | |
83 | return -ENOMEM; | |
84 | ||
85 | *_r = r; | |
86 | return 0; | |
87 | } | |
88 | ||
89 | char **path_split_and_make_absolute(const char *p) { | |
90 | char **l; | |
91 | assert(p); | |
92 | ||
116cc028 ZJS |
93 | l = strv_split(p, ":"); |
94 | if (!l) | |
9eb977db KS |
95 | return NULL; |
96 | ||
97 | if (!path_strv_make_absolute_cwd(l)) { | |
98 | strv_free(l); | |
99 | return NULL; | |
100 | } | |
101 | ||
102 | return l; | |
103 | } | |
104 | ||
105 | char *path_make_absolute(const char *p, const char *prefix) { | |
106 | assert(p); | |
107 | ||
108 | /* Makes every item in the list an absolute path by prepending | |
109 | * the prefix, if specified and necessary */ | |
110 | ||
111 | if (path_is_absolute(p) || !prefix) | |
112 | return strdup(p); | |
113 | ||
b7def684 | 114 | return strjoin(prefix, "/", p, NULL); |
9eb977db KS |
115 | } |
116 | ||
117 | char *path_make_absolute_cwd(const char *p) { | |
116cc028 | 118 | _cleanup_free_ char *cwd = NULL; |
9eb977db KS |
119 | |
120 | assert(p); | |
121 | ||
122 | /* Similar to path_make_absolute(), but prefixes with the | |
123 | * current working directory. */ | |
124 | ||
125 | if (path_is_absolute(p)) | |
126 | return strdup(p); | |
127 | ||
91a6489d LP |
128 | cwd = get_current_dir_name(); |
129 | if (!cwd) | |
9eb977db KS |
130 | return NULL; |
131 | ||
116cc028 | 132 | return path_make_absolute(p, cwd); |
9eb977db KS |
133 | } |
134 | ||
135 | char **path_strv_make_absolute_cwd(char **l) { | |
136 | char **s; | |
137 | ||
138 | /* Goes through every item in the string list and makes it | |
139 | * absolute. This works in place and won't rollback any | |
140 | * changes on failure. */ | |
141 | ||
142 | STRV_FOREACH(s, l) { | |
143 | char *t; | |
144 | ||
116cc028 ZJS |
145 | t = path_make_absolute_cwd(*s); |
146 | if (!t) | |
9eb977db KS |
147 | return NULL; |
148 | ||
149 | free(*s); | |
150 | *s = t; | |
151 | } | |
152 | ||
153 | return l; | |
154 | } | |
155 | ||
156 | char **path_strv_canonicalize(char **l) { | |
157 | char **s; | |
158 | unsigned k = 0; | |
159 | bool enomem = false; | |
160 | ||
161 | if (strv_isempty(l)) | |
162 | return l; | |
163 | ||
164 | /* Goes through every item in the string list and canonicalize | |
165 | * the path. This works in place and won't rollback any | |
166 | * changes on failure. */ | |
167 | ||
168 | STRV_FOREACH(s, l) { | |
169 | char *t, *u; | |
170 | ||
171 | t = path_make_absolute_cwd(*s); | |
172 | free(*s); | |
c9c7aef2 | 173 | *s = NULL; |
9eb977db KS |
174 | |
175 | if (!t) { | |
176 | enomem = true; | |
177 | continue; | |
178 | } | |
179 | ||
180 | errno = 0; | |
181 | u = canonicalize_file_name(t); | |
9eb977db | 182 | if (!u) { |
874310b7 ZJS |
183 | if (errno == ENOENT) |
184 | u = t; | |
185 | else { | |
186 | free(t); | |
187 | if (errno == ENOMEM || !errno) | |
188 | enomem = true; | |
189 | ||
190 | continue; | |
191 | } | |
91a6489d LP |
192 | } else |
193 | free(t); | |
9eb977db KS |
194 | |
195 | l[k++] = u; | |
196 | } | |
197 | ||
198 | l[k] = NULL; | |
199 | ||
200 | if (enomem) | |
201 | return NULL; | |
202 | ||
203 | return l; | |
204 | } | |
205 | ||
fabe5c0e LP |
206 | char **path_strv_canonicalize_uniq(char **l) { |
207 | if (strv_isempty(l)) | |
208 | return l; | |
209 | ||
210 | if (!path_strv_canonicalize(l)) | |
211 | return NULL; | |
212 | ||
213 | return strv_uniq(l); | |
214 | } | |
215 | ||
9eb977db KS |
216 | char *path_kill_slashes(char *path) { |
217 | char *f, *t; | |
218 | bool slash = false; | |
219 | ||
220 | /* Removes redundant inner and trailing slashes. Modifies the | |
221 | * passed string in-place. | |
222 | * | |
223 | * ///foo///bar/ becomes /foo/bar | |
224 | */ | |
225 | ||
226 | for (f = path, t = path; *f; f++) { | |
227 | ||
228 | if (*f == '/') { | |
229 | slash = true; | |
230 | continue; | |
231 | } | |
232 | ||
233 | if (slash) { | |
234 | slash = false; | |
235 | *(t++) = '/'; | |
236 | } | |
237 | ||
238 | *(t++) = *f; | |
239 | } | |
240 | ||
241 | /* Special rule, if we are talking of the root directory, a | |
242 | trailing slash is good */ | |
243 | ||
244 | if (t == path && slash) | |
245 | *(t++) = '/'; | |
246 | ||
247 | *t = 0; | |
248 | return path; | |
249 | } | |
250 | ||
424a19f8 | 251 | char* path_startswith(const char *path, const char *prefix) { |
9eb977db KS |
252 | assert(path); |
253 | assert(prefix); | |
254 | ||
255 | if ((path[0] == '/') != (prefix[0] == '/')) | |
424a19f8 | 256 | return NULL; |
9eb977db KS |
257 | |
258 | for (;;) { | |
259 | size_t a, b; | |
260 | ||
261 | path += strspn(path, "/"); | |
262 | prefix += strspn(prefix, "/"); | |
263 | ||
264 | if (*prefix == 0) | |
424a19f8 | 265 | return (char*) path; |
9eb977db KS |
266 | |
267 | if (*path == 0) | |
424a19f8 | 268 | return NULL; |
9eb977db KS |
269 | |
270 | a = strcspn(path, "/"); | |
271 | b = strcspn(prefix, "/"); | |
272 | ||
273 | if (a != b) | |
424a19f8 | 274 | return NULL; |
9eb977db KS |
275 | |
276 | if (memcmp(path, prefix, a) != 0) | |
424a19f8 | 277 | return NULL; |
9eb977db KS |
278 | |
279 | path += a; | |
280 | prefix += b; | |
281 | } | |
282 | } | |
283 | ||
284 | bool path_equal(const char *a, const char *b) { | |
285 | assert(a); | |
286 | assert(b); | |
287 | ||
288 | if ((a[0] == '/') != (b[0] == '/')) | |
289 | return false; | |
290 | ||
291 | for (;;) { | |
292 | size_t j, k; | |
293 | ||
294 | a += strspn(a, "/"); | |
295 | b += strspn(b, "/"); | |
296 | ||
297 | if (*a == 0 && *b == 0) | |
298 | return true; | |
299 | ||
300 | if (*a == 0 || *b == 0) | |
301 | return false; | |
302 | ||
303 | j = strcspn(a, "/"); | |
304 | k = strcspn(b, "/"); | |
305 | ||
306 | if (j != k) | |
307 | return false; | |
308 | ||
309 | if (memcmp(a, b, j) != 0) | |
310 | return false; | |
311 | ||
312 | a += j; | |
313 | b += k; | |
314 | } | |
315 | } | |
316 | ||
317 | int path_is_mount_point(const char *t, bool allow_symlink) { | |
9eb977db KS |
318 | char *parent; |
319 | int r; | |
cde9cb34 LP |
320 | struct file_handle *h; |
321 | int mount_id, mount_id_parent; | |
1640a0b6 | 322 | struct stat a, b; |
9eb977db | 323 | |
cde9cb34 LP |
324 | /* We are not actually interested in the file handles, but |
325 | * name_to_handle_at() also passes us the mount ID, hence use | |
326 | * it but throw the handle away */ | |
327 | ||
328 | if (path_equal(t, "/")) | |
329 | return 1; | |
9eb977db | 330 | |
cde9cb34 LP |
331 | h = alloca(MAX_HANDLE_SZ); |
332 | h->handle_bytes = MAX_HANDLE_SZ; | |
333 | ||
334 | r = name_to_handle_at(AT_FDCWD, t, h, &mount_id, allow_symlink ? AT_SYMLINK_FOLLOW : 0); | |
9eb977db | 335 | if (r < 0) { |
fa125f4e MM |
336 | if (errno == ENOSYS || errno == ENOTSUP) |
337 | /* This kernel or file system does not support | |
1640a0b6 LP |
338 | * name_to_handle_at(), hence fallback to the |
339 | * traditional stat() logic */ | |
340 | goto fallback; | |
341 | ||
9eb977db KS |
342 | if (errno == ENOENT) |
343 | return 0; | |
344 | ||
345 | return -errno; | |
346 | } | |
347 | ||
348 | r = path_get_parent(t, &parent); | |
349 | if (r < 0) | |
350 | return r; | |
351 | ||
cde9cb34 LP |
352 | h->handle_bytes = MAX_HANDLE_SZ; |
353 | r = name_to_handle_at(AT_FDCWD, parent, h, &mount_id_parent, 0); | |
9eb977db KS |
354 | free(parent); |
355 | ||
1640a0b6 LP |
356 | if (r < 0) { |
357 | /* The parent can't do name_to_handle_at() but the | |
358 | * directory we are interested in can? If so, it must | |
359 | * be a mount point */ | |
360 | if (errno == ENOTSUP) | |
361 | return 1; | |
362 | ||
363 | return -errno; | |
364 | } | |
365 | ||
366 | return mount_id != mount_id_parent; | |
367 | ||
368 | fallback: | |
369 | if (allow_symlink) | |
370 | r = stat(t, &a); | |
371 | else | |
f408b8f1 | 372 | r = lstat(t, &a); |
1640a0b6 | 373 | |
8ac75493 MM |
374 | if (r < 0) { |
375 | if (errno == ENOENT) | |
376 | return 0; | |
377 | ||
9eb977db | 378 | return -errno; |
8ac75493 | 379 | } |
9eb977db | 380 | |
1640a0b6 LP |
381 | r = path_get_parent(t, &parent); |
382 | if (r < 0) | |
383 | return r; | |
cde9cb34 | 384 | |
1640a0b6 LP |
385 | r = lstat(parent, &b); |
386 | free(parent); | |
387 | ||
388 | if (r < 0) | |
389 | return -errno; | |
390 | ||
391 | return a.st_dev != b.st_dev; | |
9eb977db KS |
392 | } |
393 | ||
394 | int path_is_read_only_fs(const char *path) { | |
395 | struct statvfs st; | |
396 | ||
397 | assert(path); | |
398 | ||
399 | if (statvfs(path, &st) < 0) | |
400 | return -errno; | |
401 | ||
402 | return !!(st.f_flag & ST_RDONLY); | |
403 | } | |
66060897 LP |
404 | |
405 | int path_is_os_tree(const char *path) { | |
406 | char *p; | |
407 | int r; | |
408 | ||
409 | /* We use /etc/os-release as flag file if something is an OS */ | |
410 | ||
411 | p = strappenda(path, "/etc/os-release"); | |
412 | r = access(p, F_OK); | |
413 | ||
414 | return r < 0 ? 0 : 1; | |
415 | } | |
c9d954b2 ZJS |
416 | |
417 | int find_binary(const char *name, char **filename) { | |
418 | assert(name); | |
4087cb9e LP |
419 | assert(filename); |
420 | ||
c9d954b2 ZJS |
421 | if (strchr(name, '/')) { |
422 | char *p; | |
423 | ||
424 | if (path_is_absolute(name)) | |
425 | p = strdup(name); | |
426 | else | |
427 | p = path_make_absolute_cwd(name); | |
428 | if (!p) | |
429 | return -ENOMEM; | |
430 | ||
431 | *filename = p; | |
432 | return 0; | |
433 | } else { | |
434 | const char *path; | |
435 | char *state, *w; | |
436 | size_t l; | |
437 | ||
438 | /** | |
439 | * Plain getenv, not secure_getenv, because we want | |
440 | * to actually allow the user to pick the binary. | |
441 | */ | |
442 | path = getenv("PATH"); | |
443 | if (!path) | |
444 | path = DEFAULT_PATH; | |
445 | ||
446 | FOREACH_WORD_SEPARATOR(w, l, path, ":", state) { | |
447 | char *p; | |
448 | ||
4bcc8c3c | 449 | if (asprintf(&p, "%.*s/%s", (int) l, w, name) < 0) |
c9d954b2 ZJS |
450 | return -ENOMEM; |
451 | ||
452 | if (access(p, X_OK) < 0) { | |
453 | free(p); | |
454 | continue; | |
455 | } | |
456 | ||
457 | path_kill_slashes(p); | |
458 | *filename = p; | |
459 | ||
460 | return 0; | |
461 | } | |
462 | ||
463 | return -ENOENT; | |
464 | } | |
465 | } | |
8e184852 | 466 | |
4087cb9e | 467 | bool paths_check_timestamp(char **paths, usec_t *timestamp, bool update) { |
8e184852 | 468 | bool changed = false; |
4087cb9e | 469 | char **i; |
8e184852 | 470 | |
97f2d76d TG |
471 | assert(timestamp); |
472 | ||
8e184852 | 473 | if (paths == NULL) |
4087cb9e | 474 | return false; |
8e184852 | 475 | |
4087cb9e | 476 | STRV_FOREACH(i, paths) { |
8e184852 | 477 | struct stat stats; |
4087cb9e | 478 | usec_t u; |
8e184852 | 479 | |
4087cb9e | 480 | if (stat(*i, &stats) < 0) |
8e184852 TG |
481 | continue; |
482 | ||
4087cb9e LP |
483 | u = timespec_load(&stats.st_mtim); |
484 | ||
97f2d76d | 485 | /* first check */ |
4087cb9e | 486 | if (*timestamp >= u) |
8e184852 TG |
487 | continue; |
488 | ||
9f6445e3 | 489 | log_debug("timestamp of '%s' changed", *i); |
8e184852 TG |
490 | |
491 | /* update timestamp */ | |
4087cb9e LP |
492 | if (update) { |
493 | *timestamp = u; | |
494 | changed = true; | |
495 | } else | |
496 | return true; | |
8e184852 | 497 | } |
4087cb9e | 498 | |
8e184852 TG |
499 | return changed; |
500 | } |