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Commit | Line | Data |
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9eb977db KS |
1 | /*** |
2 | This file is part of systemd. | |
3 | ||
4 | Copyright 2010-2012 Lennart Poettering | |
5 | ||
6 | systemd is free software; you can redistribute it and/or modify it | |
7 | under the terms of the GNU Lesser General Public License as published by | |
8 | the Free Software Foundation; either version 2.1 of the License, or | |
9 | (at your option) any later version. | |
10 | ||
11 | systemd is distributed in the hope that it will be useful, but | |
12 | WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
14 | Lesser General Public License for more details. | |
15 | ||
16 | You should have received a copy of the GNU Lesser General Public License | |
17 | along with systemd; If not, see <http://www.gnu.org/licenses/>. | |
18 | ***/ | |
19 | ||
9eb977db | 20 | #include <errno.h> |
11c3a366 | 21 | #include <limits.h> |
07630cea LP |
22 | #include <stdio.h> |
23 | #include <stdlib.h> | |
24 | #include <string.h> | |
11c3a366 | 25 | #include <sys/stat.h> |
07630cea | 26 | #include <unistd.h> |
9eb977db | 27 | |
5f311f8c LP |
28 | /* When we include libgen.h because we need dirname() we immediately |
29 | * undefine basename() since libgen.h defines it as a macro to the | |
30 | * POSIX version which is really broken. We prefer GNU basename(). */ | |
31 | #include <libgen.h> | |
32 | #undef basename | |
33 | ||
b5efdb8a | 34 | #include "alloc-util.h" |
93cc7779 | 35 | #include "extract-word.h" |
f4f15635 | 36 | #include "fs-util.h" |
5a46d55f | 37 | #include "glob-util.h" |
9eb977db | 38 | #include "log.h" |
07630cea LP |
39 | #include "macro.h" |
40 | #include "missing.h" | |
5a46d55f | 41 | #include "parse-util.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 | ||
605405c6 | 86 | return strjoin(prefix, "/", p); |
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 | 106 | |
605405c6 | 107 | c = strjoin(cwd, "/", p); |
0f474365 LP |
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 | ||
e1873695 | 223 | char **path_strv_resolve(char **l, const char *root) { |
9eb977db KS |
224 | char **s; |
225 | unsigned k = 0; | |
226 | bool enomem = false; | |
e1873695 | 227 | int r; |
9eb977db KS |
228 | |
229 | if (strv_isempty(l)) | |
230 | return l; | |
231 | ||
232 | /* Goes through every item in the string list and canonicalize | |
233 | * the path. This works in place and won't rollback any | |
234 | * changes on failure. */ | |
235 | ||
236 | STRV_FOREACH(s, l) { | |
12ed81d9 | 237 | _cleanup_free_ char *orig = NULL; |
e1873695 | 238 | char *t, *u; |
9eb977db | 239 | |
12ed81d9 ZJS |
240 | if (!path_is_absolute(*s)) { |
241 | free(*s); | |
9eb977db | 242 | continue; |
12ed81d9 | 243 | } |
112cfb18 | 244 | |
e1873695 | 245 | if (root) { |
12ed81d9 | 246 | orig = *s; |
e1873695 | 247 | t = prefix_root(root, orig); |
112cfb18 MM |
248 | if (!t) { |
249 | enomem = true; | |
250 | continue; | |
251 | } | |
12ed81d9 | 252 | } else |
112cfb18 | 253 | t = *s; |
9eb977db | 254 | |
c4f4fce7 | 255 | r = chase_symlinks(t, root, 0, &u); |
e1873695 LP |
256 | if (r == -ENOENT) { |
257 | if (root) { | |
258 | u = orig; | |
259 | orig = NULL; | |
874310b7 | 260 | free(t); |
e1873695 LP |
261 | } else |
262 | u = t; | |
263 | } else if (r < 0) { | |
264 | free(t); | |
874310b7 | 265 | |
e1873695 LP |
266 | if (r == -ENOMEM) |
267 | enomem = true; | |
268 | ||
269 | continue; | |
270 | } else if (root) { | |
12ed81d9 ZJS |
271 | char *x; |
272 | ||
273 | free(t); | |
e1873695 | 274 | x = path_startswith(u, root); |
12ed81d9 ZJS |
275 | if (x) { |
276 | /* restore the slash if it was lost */ | |
277 | if (!startswith(x, "/")) | |
278 | *(--x) = '/'; | |
279 | ||
280 | t = strdup(x); | |
281 | free(u); | |
282 | if (!t) { | |
283 | enomem = true; | |
284 | continue; | |
285 | } | |
286 | u = t; | |
287 | } else { | |
288 | /* canonicalized path goes outside of | |
289 | * prefix, keep the original path instead */ | |
3b319885 | 290 | free_and_replace(u, orig); |
12ed81d9 | 291 | } |
91a6489d LP |
292 | } else |
293 | free(t); | |
9eb977db KS |
294 | |
295 | l[k++] = u; | |
296 | } | |
297 | ||
298 | l[k] = NULL; | |
299 | ||
300 | if (enomem) | |
301 | return NULL; | |
302 | ||
303 | return l; | |
304 | } | |
305 | ||
e1873695 | 306 | char **path_strv_resolve_uniq(char **l, const char *root) { |
112cfb18 | 307 | |
fabe5c0e LP |
308 | if (strv_isempty(l)) |
309 | return l; | |
310 | ||
e1873695 | 311 | if (!path_strv_resolve(l, root)) |
fabe5c0e LP |
312 | return NULL; |
313 | ||
314 | return strv_uniq(l); | |
315 | } | |
316 | ||
9eb977db KS |
317 | char *path_kill_slashes(char *path) { |
318 | char *f, *t; | |
319 | bool slash = false; | |
320 | ||
321 | /* Removes redundant inner and trailing slashes. Modifies the | |
322 | * passed string in-place. | |
323 | * | |
324 | * ///foo///bar/ becomes /foo/bar | |
325 | */ | |
326 | ||
327 | for (f = path, t = path; *f; f++) { | |
328 | ||
329 | if (*f == '/') { | |
330 | slash = true; | |
331 | continue; | |
332 | } | |
333 | ||
334 | if (slash) { | |
335 | slash = false; | |
336 | *(t++) = '/'; | |
337 | } | |
338 | ||
339 | *(t++) = *f; | |
340 | } | |
341 | ||
342 | /* Special rule, if we are talking of the root directory, a | |
343 | trailing slash is good */ | |
344 | ||
345 | if (t == path && slash) | |
346 | *(t++) = '/'; | |
347 | ||
348 | *t = 0; | |
349 | return path; | |
350 | } | |
351 | ||
424a19f8 | 352 | char* path_startswith(const char *path, const char *prefix) { |
9eb977db KS |
353 | assert(path); |
354 | assert(prefix); | |
355 | ||
0470289b ZJS |
356 | /* Returns a pointer to the start of the first component after the parts matched by |
357 | * the prefix, iff | |
358 | * - both paths are absolute or both paths are relative, | |
359 | * and | |
360 | * - each component in prefix in turn matches a component in path at the same position. | |
361 | * An empty string will be returned when the prefix and path are equivalent. | |
362 | * | |
363 | * Returns NULL otherwise. | |
364 | */ | |
365 | ||
9eb977db | 366 | if ((path[0] == '/') != (prefix[0] == '/')) |
424a19f8 | 367 | return NULL; |
9eb977db KS |
368 | |
369 | for (;;) { | |
370 | size_t a, b; | |
371 | ||
372 | path += strspn(path, "/"); | |
373 | prefix += strspn(prefix, "/"); | |
374 | ||
375 | if (*prefix == 0) | |
424a19f8 | 376 | return (char*) path; |
9eb977db KS |
377 | |
378 | if (*path == 0) | |
424a19f8 | 379 | return NULL; |
9eb977db KS |
380 | |
381 | a = strcspn(path, "/"); | |
382 | b = strcspn(prefix, "/"); | |
383 | ||
384 | if (a != b) | |
424a19f8 | 385 | return NULL; |
9eb977db KS |
386 | |
387 | if (memcmp(path, prefix, a) != 0) | |
424a19f8 | 388 | return NULL; |
9eb977db KS |
389 | |
390 | path += a; | |
391 | prefix += b; | |
392 | } | |
393 | } | |
394 | ||
2230852b MS |
395 | int path_compare(const char *a, const char *b) { |
396 | int d; | |
397 | ||
9eb977db KS |
398 | assert(a); |
399 | assert(b); | |
400 | ||
2230852b MS |
401 | /* A relative path and an abolute path must not compare as equal. |
402 | * Which one is sorted before the other does not really matter. | |
403 | * Here a relative path is ordered before an absolute path. */ | |
404 | d = (a[0] == '/') - (b[0] == '/'); | |
373cd63a | 405 | if (d != 0) |
2230852b | 406 | return d; |
9eb977db KS |
407 | |
408 | for (;;) { | |
409 | size_t j, k; | |
410 | ||
411 | a += strspn(a, "/"); | |
412 | b += strspn(b, "/"); | |
413 | ||
414 | if (*a == 0 && *b == 0) | |
2230852b | 415 | return 0; |
9eb977db | 416 | |
2230852b MS |
417 | /* Order prefixes first: "/foo" before "/foo/bar" */ |
418 | if (*a == 0) | |
419 | return -1; | |
420 | if (*b == 0) | |
421 | return 1; | |
9eb977db KS |
422 | |
423 | j = strcspn(a, "/"); | |
424 | k = strcspn(b, "/"); | |
425 | ||
2230852b MS |
426 | /* Alphabetical sort: "/foo/aaa" before "/foo/b" */ |
427 | d = memcmp(a, b, MIN(j, k)); | |
373cd63a | 428 | if (d != 0) |
2230852b | 429 | return (d > 0) - (d < 0); /* sign of d */ |
9eb977db | 430 | |
2230852b MS |
431 | /* Sort "/foo/a" before "/foo/aaa" */ |
432 | d = (j > k) - (j < k); /* sign of (j - k) */ | |
373cd63a | 433 | if (d != 0) |
2230852b | 434 | return d; |
9eb977db KS |
435 | |
436 | a += j; | |
437 | b += k; | |
438 | } | |
439 | } | |
440 | ||
2230852b MS |
441 | bool path_equal(const char *a, const char *b) { |
442 | return path_compare(a, b) == 0; | |
443 | } | |
444 | ||
e3f791a2 ZJS |
445 | bool path_equal_or_files_same(const char *a, const char *b, int flags) { |
446 | return path_equal(a, b) || files_same(a, b, flags) > 0; | |
c78e47a6 MS |
447 | } |
448 | ||
0c6ea3a4 ZJS |
449 | char* path_join(const char *root, const char *path, const char *rest) { |
450 | assert(path); | |
451 | ||
452 | if (!isempty(root)) | |
bc854dc7 | 453 | return strjoin(root, endswith(root, "/") ? "" : "/", |
0c6ea3a4 | 454 | path[0] == '/' ? path+1 : path, |
bc854dc7 | 455 | rest ? (endswith(path, "/") ? "" : "/") : NULL, |
605405c6 | 456 | rest && rest[0] == '/' ? rest+1 : rest); |
0c6ea3a4 ZJS |
457 | else |
458 | return strjoin(path, | |
bc854dc7 | 459 | rest ? (endswith(path, "/") ? "" : "/") : NULL, |
605405c6 | 460 | rest && rest[0] == '/' ? rest+1 : rest); |
0c6ea3a4 ZJS |
461 | } |
462 | ||
85eca92e LP |
463 | int find_binary(const char *name, char **ret) { |
464 | int last_error, r; | |
465 | const char *p; | |
466 | ||
c9d954b2 | 467 | assert(name); |
4087cb9e | 468 | |
571d0134 | 469 | if (is_path(name)) { |
85eca92e | 470 | if (access(name, X_OK) < 0) |
b972115c ZJS |
471 | return -errno; |
472 | ||
85eca92e | 473 | if (ret) { |
0f474365 LP |
474 | r = path_make_absolute_cwd(name, ret); |
475 | if (r < 0) | |
476 | return r; | |
eb66db55 | 477 | } |
c9d954b2 | 478 | |
c9d954b2 | 479 | return 0; |
85eca92e | 480 | } |
c9d954b2 | 481 | |
85eca92e LP |
482 | /** |
483 | * Plain getenv, not secure_getenv, because we want | |
484 | * to actually allow the user to pick the binary. | |
485 | */ | |
486 | p = getenv("PATH"); | |
487 | if (!p) | |
488 | p = DEFAULT_PATH; | |
489 | ||
490 | last_error = -ENOENT; | |
491 | ||
492 | for (;;) { | |
493 | _cleanup_free_ char *j = NULL, *element = NULL; | |
494 | ||
495 | r = extract_first_word(&p, &element, ":", EXTRACT_RELAX|EXTRACT_DONT_COALESCE_SEPARATORS); | |
496 | if (r < 0) | |
497 | return r; | |
498 | if (r == 0) | |
499 | break; | |
500 | ||
0f474365 LP |
501 | if (!path_is_absolute(element)) |
502 | continue; | |
503 | ||
605405c6 | 504 | j = strjoin(element, "/", name); |
85eca92e LP |
505 | if (!j) |
506 | return -ENOMEM; | |
507 | ||
508 | if (access(j, X_OK) >= 0) { | |
509 | /* Found it! */ | |
c9d954b2 | 510 | |
85eca92e LP |
511 | if (ret) { |
512 | *ret = path_kill_slashes(j); | |
513 | j = NULL; | |
eb66db55 | 514 | } |
c9d954b2 ZJS |
515 | |
516 | return 0; | |
517 | } | |
518 | ||
85eca92e | 519 | last_error = -errno; |
c9d954b2 | 520 | } |
85eca92e LP |
521 | |
522 | return last_error; | |
c9d954b2 | 523 | } |
8e184852 | 524 | |
2ad8416d | 525 | bool paths_check_timestamp(const char* const* paths, usec_t *timestamp, bool update) { |
8e184852 | 526 | bool changed = false; |
2ad8416d | 527 | const char* const* i; |
8e184852 | 528 | |
97f2d76d TG |
529 | assert(timestamp); |
530 | ||
8e184852 | 531 | if (paths == NULL) |
4087cb9e | 532 | return false; |
8e184852 | 533 | |
4087cb9e | 534 | STRV_FOREACH(i, paths) { |
8e184852 | 535 | struct stat stats; |
4087cb9e | 536 | usec_t u; |
8e184852 | 537 | |
4087cb9e | 538 | if (stat(*i, &stats) < 0) |
8e184852 TG |
539 | continue; |
540 | ||
4087cb9e LP |
541 | u = timespec_load(&stats.st_mtim); |
542 | ||
97f2d76d | 543 | /* first check */ |
4087cb9e | 544 | if (*timestamp >= u) |
8e184852 TG |
545 | continue; |
546 | ||
9f6445e3 | 547 | log_debug("timestamp of '%s' changed", *i); |
8e184852 TG |
548 | |
549 | /* update timestamp */ | |
4087cb9e LP |
550 | if (update) { |
551 | *timestamp = u; | |
552 | changed = true; | |
553 | } else | |
554 | return true; | |
8e184852 | 555 | } |
4087cb9e | 556 | |
8e184852 TG |
557 | return changed; |
558 | } | |
eb66db55 | 559 | |
5bcd08db | 560 | static int binary_is_good(const char *binary) { |
571d0134 | 561 | _cleanup_free_ char *p = NULL, *d = NULL; |
571d0134 | 562 | int r; |
eb66db55 | 563 | |
85eca92e LP |
564 | r = find_binary(binary, &p); |
565 | if (r == -ENOENT) | |
566 | return 0; | |
571d0134 LP |
567 | if (r < 0) |
568 | return r; | |
569 | ||
061df014 | 570 | /* An fsck that is linked to /bin/true is a non-existent |
571d0134 LP |
571 | * fsck */ |
572 | ||
573 | r = readlink_malloc(p, &d); | |
85eca92e LP |
574 | if (r == -EINVAL) /* not a symlink */ |
575 | return 1; | |
576 | if (r < 0) | |
577 | return r; | |
571d0134 | 578 | |
3ae5990c ZJS |
579 | return !PATH_IN_SET(d, "true" |
580 | "/bin/true", | |
581 | "/usr/bin/true", | |
582 | "/dev/null"); | |
eb66db55 | 583 | } |
1d13f648 | 584 | |
5bcd08db LP |
585 | int fsck_exists(const char *fstype) { |
586 | const char *checker; | |
587 | ||
85eca92e | 588 | assert(fstype); |
5bcd08db | 589 | |
85eca92e LP |
590 | if (streq(fstype, "auto")) |
591 | return -EINVAL; | |
592 | ||
593 | checker = strjoina("fsck.", fstype); | |
5bcd08db LP |
594 | return binary_is_good(checker); |
595 | } | |
596 | ||
597 | int mkfs_exists(const char *fstype) { | |
598 | const char *mkfs; | |
599 | ||
85eca92e | 600 | assert(fstype); |
5bcd08db | 601 | |
85eca92e LP |
602 | if (streq(fstype, "auto")) |
603 | return -EINVAL; | |
604 | ||
605 | mkfs = strjoina("mkfs.", fstype); | |
5bcd08db LP |
606 | return binary_is_good(mkfs); |
607 | } | |
608 | ||
1d13f648 LP |
609 | char *prefix_root(const char *root, const char *path) { |
610 | char *n, *p; | |
611 | size_t l; | |
612 | ||
613 | /* If root is passed, prefixes path with it. Otherwise returns | |
614 | * it as is. */ | |
615 | ||
616 | assert(path); | |
617 | ||
618 | /* First, drop duplicate prefixing slashes from the path */ | |
619 | while (path[0] == '/' && path[1] == '/') | |
620 | path++; | |
621 | ||
622 | if (isempty(root) || path_equal(root, "/")) | |
623 | return strdup(path); | |
624 | ||
625 | l = strlen(root) + 1 + strlen(path) + 1; | |
626 | ||
627 | n = new(char, l); | |
628 | if (!n) | |
629 | return NULL; | |
630 | ||
631 | p = stpcpy(n, root); | |
632 | ||
633 | while (p > n && p[-1] == '/') | |
634 | p--; | |
635 | ||
636 | if (path[0] != '/') | |
637 | *(p++) = '/'; | |
638 | ||
639 | strcpy(p, path); | |
640 | return n; | |
641 | } | |
0f03c2a4 LP |
642 | |
643 | int parse_path_argument_and_warn(const char *path, bool suppress_root, char **arg) { | |
644 | char *p; | |
645 | int r; | |
646 | ||
647 | /* | |
648 | * This function is intended to be used in command line | |
649 | * parsers, to handle paths that are passed in. It makes the | |
650 | * path absolute, and reduces it to NULL if omitted or | |
651 | * root (the latter optionally). | |
652 | * | |
653 | * NOTE THAT THIS WILL FREE THE PREVIOUS ARGUMENT POINTER ON | |
654 | * SUCCESS! Hence, do not pass in uninitialized pointers. | |
655 | */ | |
656 | ||
657 | if (isempty(path)) { | |
658 | *arg = mfree(*arg); | |
659 | return 0; | |
660 | } | |
661 | ||
662 | r = path_make_absolute_cwd(path, &p); | |
663 | if (r < 0) | |
664 | return log_error_errno(r, "Failed to parse path \"%s\" and make it absolute: %m", path); | |
665 | ||
666 | path_kill_slashes(p); | |
667 | if (suppress_root && path_equal(p, "/")) | |
668 | p = mfree(p); | |
669 | ||
670 | free(*arg); | |
671 | *arg = p; | |
672 | return 0; | |
673 | } | |
5f311f8c LP |
674 | |
675 | char* dirname_malloc(const char *path) { | |
676 | char *d, *dir, *dir2; | |
677 | ||
678 | assert(path); | |
679 | ||
680 | d = strdup(path); | |
681 | if (!d) | |
682 | return NULL; | |
683 | ||
684 | dir = dirname(d); | |
685 | assert(dir); | |
686 | ||
687 | if (dir == d) | |
688 | return d; | |
689 | ||
690 | dir2 = strdup(dir); | |
691 | free(d); | |
692 | ||
693 | return dir2; | |
694 | } | |
bb15fafe LP |
695 | |
696 | bool filename_is_valid(const char *p) { | |
697 | const char *e; | |
698 | ||
699 | if (isempty(p)) | |
700 | return false; | |
701 | ||
49bfc877 | 702 | if (dot_or_dot_dot(p)) |
bb15fafe LP |
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 | ||
49bfc877 LP |
720 | if (dot_or_dot_dot(p)) |
721 | return false; | |
722 | ||
723 | if (startswith(p, "../") || endswith(p, "/..") || strstr(p, "/../")) | |
bb15fafe LP |
724 | return false; |
725 | ||
726 | if (strlen(p)+1 > PATH_MAX) | |
727 | return false; | |
728 | ||
729 | /* The following two checks are not really dangerous, but hey, they still are confusing */ | |
49bfc877 | 730 | if (startswith(p, "./") || endswith(p, "/.") || strstr(p, "/./")) |
bb15fafe LP |
731 | return false; |
732 | ||
733 | if (strstr(p, "//")) | |
734 | return false; | |
735 | ||
736 | return true; | |
737 | } | |
a0956174 LP |
738 | |
739 | char *file_in_same_dir(const char *path, const char *filename) { | |
740 | char *e, *ret; | |
741 | size_t k; | |
742 | ||
743 | assert(path); | |
744 | assert(filename); | |
745 | ||
746 | /* This removes the last component of path and appends | |
747 | * filename, unless the latter is absolute anyway or the | |
748 | * former isn't */ | |
749 | ||
750 | if (path_is_absolute(filename)) | |
751 | return strdup(filename); | |
752 | ||
753 | e = strrchr(path, '/'); | |
754 | if (!e) | |
755 | return strdup(filename); | |
756 | ||
757 | k = strlen(filename); | |
758 | ret = new(char, (e + 1 - path) + k + 1); | |
759 | if (!ret) | |
760 | return NULL; | |
761 | ||
762 | memcpy(mempcpy(ret, path, e + 1 - path), filename, k + 1); | |
763 | return ret; | |
764 | } | |
765 | ||
55cdd057 ZJS |
766 | bool hidden_or_backup_file(const char *filename) { |
767 | const char *p; | |
a0956174 | 768 | |
a0956174 LP |
769 | assert(filename); |
770 | ||
55cdd057 ZJS |
771 | if (filename[0] == '.' || |
772 | streq(filename, "lost+found") || | |
773 | streq(filename, "aquota.user") || | |
774 | streq(filename, "aquota.group") || | |
775 | endswith(filename, "~")) | |
a0956174 LP |
776 | return true; |
777 | ||
55cdd057 ZJS |
778 | p = strrchr(filename, '.'); |
779 | if (!p) | |
780 | return false; | |
781 | ||
941060bf LP |
782 | /* Please, let's not add more entries to the list below. If external projects think it's a good idea to come up |
783 | * with always new suffixes and that everybody else should just adjust to that, then it really should be on | |
784 | * them. Hence, in future, let's not add any more entries. Instead, let's ask those packages to instead adopt | |
785 | * one of the generic suffixes/prefixes for hidden files or backups, possibly augmented with an additional | |
786 | * string. Specifically: there's now: | |
787 | * | |
788 | * The generic suffixes "~" and ".bak" for backup files | |
789 | * The generic prefix "." for hidden files | |
790 | * | |
94a0ef6e ZJS |
791 | * Thus, if a new package manager "foopkg" wants its own set of ".foopkg-new", ".foopkg-old", ".foopkg-dist" |
792 | * or so registered, let's refuse that and ask them to use ".foopkg.new", ".foopkg.old" or ".foopkg~" instead. | |
941060bf LP |
793 | */ |
794 | ||
55cdd057 ZJS |
795 | return STR_IN_SET(p + 1, |
796 | "rpmnew", | |
797 | "rpmsave", | |
798 | "rpmorig", | |
799 | "dpkg-old", | |
800 | "dpkg-new", | |
801 | "dpkg-tmp", | |
802 | "dpkg-dist", | |
803 | "dpkg-bak", | |
804 | "dpkg-backup", | |
805 | "dpkg-remove", | |
806 | "ucf-new", | |
807 | "ucf-old", | |
808 | "ucf-dist", | |
941060bf | 809 | "swp", |
94a0ef6e ZJS |
810 | "bak", |
811 | "old", | |
812 | "new"); | |
a0956174 LP |
813 | } |
814 | ||
815 | bool is_device_path(const char *path) { | |
816 | ||
817 | /* Returns true on paths that refer to a device, either in | |
818 | * sysfs or in /dev */ | |
819 | ||
3ccb8862 ZJS |
820 | return path_startswith(path, "/dev/") || |
821 | path_startswith(path, "/sys/"); | |
822 | } | |
823 | ||
824 | bool is_deviceallow_pattern(const char *path) { | |
825 | return path_startswith(path, "/dev/") || | |
826 | startswith(path, "block-") || | |
827 | startswith(path, "char-"); | |
a0956174 | 828 | } |
5a46d55f ZJS |
829 | |
830 | int systemd_installation_has_version(const char *root, unsigned minimal_version) { | |
831 | const char *pattern; | |
832 | int r; | |
833 | ||
834 | /* Try to guess if systemd installation is later than the specified version. This | |
835 | * is hacky and likely to yield false negatives, particularly if the installation | |
836 | * is non-standard. False positives should be relatively rare. | |
837 | */ | |
838 | ||
839 | NULSTR_FOREACH(pattern, | |
840 | /* /lib works for systems without usr-merge, and for systems with a sane | |
841 | * usr-merge, where /lib is a symlink to /usr/lib. /usr/lib is necessary | |
842 | * for Gentoo which does a merge without making /lib a symlink. | |
843 | */ | |
844 | "lib/systemd/libsystemd-shared-*.so\0" | |
845 | "usr/lib/systemd/libsystemd-shared-*.so\0") { | |
846 | ||
847 | _cleanup_strv_free_ char **names = NULL; | |
848 | _cleanup_free_ char *path = NULL; | |
849 | char *c, **name; | |
850 | ||
851 | path = prefix_root(root, pattern); | |
852 | if (!path) | |
853 | return -ENOMEM; | |
854 | ||
855 | r = glob_extend(&names, path); | |
856 | if (r == -ENOENT) | |
857 | continue; | |
858 | if (r < 0) | |
859 | return r; | |
860 | ||
861 | assert_se((c = endswith(path, "*.so"))); | |
862 | *c = '\0'; /* truncate the glob part */ | |
863 | ||
864 | STRV_FOREACH(name, names) { | |
865 | /* This is most likely to run only once, hence let's not optimize anything. */ | |
866 | char *t, *t2; | |
867 | unsigned version; | |
868 | ||
869 | t = startswith(*name, path); | |
870 | if (!t) | |
871 | continue; | |
872 | ||
873 | t2 = endswith(t, ".so"); | |
874 | if (!t2) | |
875 | continue; | |
876 | ||
877 | t2[0] = '\0'; /* truncate the suffix */ | |
878 | ||
879 | r = safe_atou(t, &version); | |
880 | if (r < 0) { | |
881 | log_debug_errno(r, "Found libsystemd shared at \"%s.so\", but failed to parse version: %m", *name); | |
882 | continue; | |
883 | } | |
884 | ||
885 | log_debug("Found libsystemd shared at \"%s.so\", version %u (%s).", | |
886 | *name, version, | |
887 | version >= minimal_version ? "OK" : "too old"); | |
888 | if (version >= minimal_version) | |
889 | return true; | |
890 | } | |
891 | } | |
892 | ||
893 | return false; | |
894 | } | |
49bfc877 LP |
895 | |
896 | bool dot_or_dot_dot(const char *path) { | |
897 | if (!path) | |
898 | return false; | |
899 | if (path[0] != '.') | |
900 | return false; | |
901 | if (path[1] == 0) | |
902 | return true; | |
903 | if (path[1] != '.') | |
904 | return false; | |
905 | ||
906 | return path[2] == 0; | |
907 | } |