]>
Commit | Line | Data |
---|---|---|
db9ecf05 | 1 | /* SPDX-License-Identifier: LGPL-2.1-or-later */ |
9eb977db | 2 | |
9eb977db | 3 | #include <errno.h> |
11c3a366 | 4 | #include <limits.h> |
07630cea LP |
5 | #include <stdio.h> |
6 | #include <stdlib.h> | |
07630cea | 7 | #include <unistd.h> |
9eb977db | 8 | |
5f311f8c LP |
9 | /* When we include libgen.h because we need dirname() we immediately |
10 | * undefine basename() since libgen.h defines it as a macro to the | |
11 | * POSIX version which is really broken. We prefer GNU basename(). */ | |
12 | #include <libgen.h> | |
13 | #undef basename | |
14 | ||
b5efdb8a | 15 | #include "alloc-util.h" |
93cc7779 | 16 | #include "extract-word.h" |
bb0c0d6f | 17 | #include "fd-util.h" |
f4f15635 | 18 | #include "fs-util.h" |
5a46d55f | 19 | #include "glob-util.h" |
9eb977db | 20 | #include "log.h" |
07630cea | 21 | #include "macro.h" |
d8b4d14d | 22 | #include "nulstr-util.h" |
5a46d55f | 23 | #include "parse-util.h" |
3ffd4af2 | 24 | #include "path-util.h" |
8fcde012 | 25 | #include "stat-util.h" |
07630cea | 26 | #include "string-util.h" |
9eb977db | 27 | #include "strv.h" |
93cc7779 | 28 | #include "time-util.h" |
58a53add | 29 | #include "utf8.h" |
9eb977db | 30 | |
0f474365 | 31 | int path_split_and_make_absolute(const char *p, char ***ret) { |
9eb977db | 32 | char **l; |
0f474365 LP |
33 | int r; |
34 | ||
9eb977db | 35 | assert(p); |
0f474365 | 36 | assert(ret); |
9eb977db | 37 | |
116cc028 ZJS |
38 | l = strv_split(p, ":"); |
39 | if (!l) | |
ce9d6bcf | 40 | return -ENOMEM; |
9eb977db | 41 | |
0f474365 LP |
42 | r = path_strv_make_absolute_cwd(l); |
43 | if (r < 0) { | |
9eb977db | 44 | strv_free(l); |
0f474365 | 45 | return r; |
9eb977db KS |
46 | } |
47 | ||
0f474365 LP |
48 | *ret = l; |
49 | return r; | |
9eb977db KS |
50 | } |
51 | ||
52 | char *path_make_absolute(const char *p, const char *prefix) { | |
53 | assert(p); | |
54 | ||
55 | /* Makes every item in the list an absolute path by prepending | |
56 | * the prefix, if specified and necessary */ | |
57 | ||
81cce8de | 58 | if (path_is_absolute(p) || isempty(prefix)) |
9eb977db KS |
59 | return strdup(p); |
60 | ||
657ee2d8 | 61 | return path_join(prefix, p); |
9eb977db KS |
62 | } |
63 | ||
a2556d25 LP |
64 | int safe_getcwd(char **ret) { |
65 | char *cwd; | |
66 | ||
67 | cwd = get_current_dir_name(); | |
68 | if (!cwd) | |
69 | return negative_errno(); | |
70 | ||
71 | /* Let's make sure the directory is really absolute, to protect us from the logic behind | |
72 | * CVE-2018-1000001 */ | |
73 | if (cwd[0] != '/') { | |
74 | free(cwd); | |
75 | return -ENOMEDIUM; | |
76 | } | |
77 | ||
78 | *ret = cwd; | |
79 | return 0; | |
80 | } | |
81 | ||
0f474365 LP |
82 | int path_make_absolute_cwd(const char *p, char **ret) { |
83 | char *c; | |
d7249575 | 84 | int r; |
9eb977db KS |
85 | |
86 | assert(p); | |
0f474365 | 87 | assert(ret); |
9eb977db KS |
88 | |
89 | /* Similar to path_make_absolute(), but prefixes with the | |
90 | * current working directory. */ | |
91 | ||
92 | if (path_is_absolute(p)) | |
0f474365 LP |
93 | c = strdup(p); |
94 | else { | |
95 | _cleanup_free_ char *cwd = NULL; | |
9eb977db | 96 | |
d7249575 LP |
97 | r = safe_getcwd(&cwd); |
98 | if (r < 0) | |
99 | return r; | |
0f474365 | 100 | |
62a85ee0 | 101 | c = path_join(cwd, p); |
0f474365 LP |
102 | } |
103 | if (!c) | |
104 | return -ENOMEM; | |
9eb977db | 105 | |
0f474365 LP |
106 | *ret = c; |
107 | return 0; | |
9eb977db KS |
108 | } |
109 | ||
fe69c41e YW |
110 | int path_make_relative(const char *from, const char *to, char **ret) { |
111 | _cleanup_free_ char *result = NULL; | |
112 | unsigned n_parents; | |
113 | const char *f, *t; | |
114 | int r, k; | |
115 | char *p; | |
116 | ||
117 | assert(from); | |
118 | assert(to); | |
119 | assert(ret); | |
7cb9c51c TK |
120 | |
121 | /* Strips the common part, and adds ".." elements as necessary. */ | |
122 | ||
fe69c41e | 123 | if (!path_is_absolute(from) || !path_is_absolute(to)) |
7cb9c51c TK |
124 | return -EINVAL; |
125 | ||
7cb9c51c | 126 | for (;;) { |
fe69c41e YW |
127 | r = path_find_first_component(&from, true, &f); |
128 | if (r < 0) | |
129 | return r; | |
130 | ||
131 | k = path_find_first_component(&to, true, &t); | |
132 | if (k < 0) | |
133 | return k; | |
134 | ||
135 | if (r == 0) { | |
136 | /* end of 'from' */ | |
137 | if (k == 0) { | |
138 | /* from and to are equivalent. */ | |
139 | result = strdup("."); | |
140 | if (!result) | |
141 | return -ENOMEM; | |
142 | } else { | |
143 | /* 'to' is inside of 'from'. */ | |
144 | result = strdup(t); | |
145 | if (!result) | |
146 | return -ENOMEM; | |
147 | ||
4ff361cc | 148 | path_simplify(result); |
fe69c41e YW |
149 | |
150 | if (!path_is_valid(result)) | |
151 | return -EINVAL; | |
152 | } | |
153 | ||
154 | *ret = TAKE_PTR(result); | |
7cb9c51c TK |
155 | return 0; |
156 | } | |
157 | ||
fe69c41e | 158 | if (r != k || !strneq(f, t, r)) |
7cb9c51c | 159 | break; |
7cb9c51c TK |
160 | } |
161 | ||
162 | /* If we're here, then "from_dir" has one or more elements that need to | |
163 | * be replaced with "..". */ | |
164 | ||
fe69c41e YW |
165 | for (n_parents = 1;; n_parents++) { |
166 | /* If this includes ".." we can't do a simple series of "..". */ | |
167 | r = path_find_first_component(&from, false, &f); | |
168 | if (r < 0) | |
169 | return r; | |
170 | if (r == 0) | |
171 | break; | |
172 | } | |
2a5beb66 | 173 | |
fe69c41e YW |
174 | if (isempty(t) && n_parents * 3 > PATH_MAX) |
175 | /* PATH_MAX is counted *with* the trailing NUL byte */ | |
176 | return -EINVAL; | |
2a5beb66 | 177 | |
fe69c41e YW |
178 | result = new(char, n_parents * 3 + !isempty(t) + strlen_ptr(t)); |
179 | if (!result) | |
180 | return -ENOMEM; | |
2a5beb66 | 181 | |
fe69c41e YW |
182 | for (p = result; n_parents > 0; n_parents--) |
183 | p = mempcpy(p, "../", 3); | |
2a5beb66 | 184 | |
fe69c41e YW |
185 | if (isempty(t)) { |
186 | /* Remove trailing slash and terminate string. */ | |
187 | *(--p) = '\0'; | |
188 | *ret = TAKE_PTR(result); | |
189 | return 0; | |
7cb9c51c TK |
190 | } |
191 | ||
fe69c41e | 192 | strcpy(p, t); |
7cb9c51c | 193 | |
4ff361cc | 194 | path_simplify(result); |
7cb9c51c | 195 | |
fe69c41e YW |
196 | if (!path_is_valid(result)) |
197 | return -EINVAL; | |
7cb9c51c | 198 | |
fe69c41e | 199 | *ret = TAKE_PTR(result); |
7cb9c51c TK |
200 | return 0; |
201 | } | |
202 | ||
cc4d7d81 ZJS |
203 | char* path_startswith_strv(const char *p, char **set) { |
204 | char **s, *t; | |
205 | ||
206 | STRV_FOREACH(s, set) { | |
207 | t = path_startswith(p, *s); | |
208 | if (t) | |
209 | return t; | |
210 | } | |
211 | ||
212 | return NULL; | |
213 | } | |
214 | ||
0f474365 | 215 | int path_strv_make_absolute_cwd(char **l) { |
9eb977db | 216 | char **s; |
0f474365 | 217 | int r; |
9eb977db KS |
218 | |
219 | /* Goes through every item in the string list and makes it | |
220 | * absolute. This works in place and won't rollback any | |
221 | * changes on failure. */ | |
222 | ||
223 | STRV_FOREACH(s, l) { | |
224 | char *t; | |
225 | ||
0f474365 LP |
226 | r = path_make_absolute_cwd(*s, &t); |
227 | if (r < 0) | |
228 | return r; | |
9eb977db | 229 | |
4ff361cc | 230 | path_simplify(t); |
32a8f700 | 231 | free_and_replace(*s, t); |
9eb977db KS |
232 | } |
233 | ||
0f474365 | 234 | return 0; |
9eb977db KS |
235 | } |
236 | ||
e1873695 | 237 | char **path_strv_resolve(char **l, const char *root) { |
9eb977db KS |
238 | char **s; |
239 | unsigned k = 0; | |
240 | bool enomem = false; | |
e1873695 | 241 | int r; |
9eb977db KS |
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) { | |
12ed81d9 | 251 | _cleanup_free_ char *orig = NULL; |
e1873695 | 252 | char *t, *u; |
9eb977db | 253 | |
12ed81d9 ZJS |
254 | if (!path_is_absolute(*s)) { |
255 | free(*s); | |
9eb977db | 256 | continue; |
12ed81d9 | 257 | } |
112cfb18 | 258 | |
e1873695 | 259 | if (root) { |
12ed81d9 | 260 | orig = *s; |
c6134d3e | 261 | t = path_join(root, orig); |
112cfb18 MM |
262 | if (!t) { |
263 | enomem = true; | |
264 | continue; | |
265 | } | |
12ed81d9 | 266 | } else |
112cfb18 | 267 | t = *s; |
9eb977db | 268 | |
a5648b80 | 269 | r = chase_symlinks(t, root, 0, &u, NULL); |
e1873695 LP |
270 | if (r == -ENOENT) { |
271 | if (root) { | |
ae2a15bc | 272 | u = TAKE_PTR(orig); |
874310b7 | 273 | free(t); |
e1873695 LP |
274 | } else |
275 | u = t; | |
276 | } else if (r < 0) { | |
277 | free(t); | |
874310b7 | 278 | |
e1873695 LP |
279 | if (r == -ENOMEM) |
280 | enomem = true; | |
281 | ||
282 | continue; | |
283 | } else if (root) { | |
12ed81d9 ZJS |
284 | char *x; |
285 | ||
286 | free(t); | |
e1873695 | 287 | x = path_startswith(u, root); |
12ed81d9 ZJS |
288 | if (x) { |
289 | /* restore the slash if it was lost */ | |
290 | if (!startswith(x, "/")) | |
291 | *(--x) = '/'; | |
292 | ||
293 | t = strdup(x); | |
294 | free(u); | |
295 | if (!t) { | |
296 | enomem = true; | |
297 | continue; | |
298 | } | |
299 | u = t; | |
300 | } else { | |
301 | /* canonicalized path goes outside of | |
302 | * prefix, keep the original path instead */ | |
3b319885 | 303 | free_and_replace(u, orig); |
12ed81d9 | 304 | } |
91a6489d LP |
305 | } else |
306 | free(t); | |
9eb977db KS |
307 | |
308 | l[k++] = u; | |
309 | } | |
310 | ||
311 | l[k] = NULL; | |
312 | ||
313 | if (enomem) | |
314 | return NULL; | |
315 | ||
316 | return l; | |
317 | } | |
318 | ||
e1873695 | 319 | char **path_strv_resolve_uniq(char **l, const char *root) { |
112cfb18 | 320 | |
fabe5c0e LP |
321 | if (strv_isempty(l)) |
322 | return l; | |
323 | ||
e1873695 | 324 | if (!path_strv_resolve(l, root)) |
fabe5c0e LP |
325 | return NULL; |
326 | ||
327 | return strv_uniq(l); | |
328 | } | |
329 | ||
4ff361cc | 330 | char *path_simplify(char *path) { |
cb71ed91 YW |
331 | bool add_slash = false; |
332 | char *f = path; | |
333 | int r; | |
9eb977db | 334 | |
858d36c1 YW |
335 | assert(path); |
336 | ||
cb71ed91 YW |
337 | /* Removes redundant inner and trailing slashes. Also removes unnecessary dots. |
338 | * Modifies the passed string in-place. | |
9eb977db | 339 | * |
cb71ed91 YW |
340 | * ///foo//./bar/. becomes /foo/bar |
341 | * .//./foo//./bar/. becomes foo/bar | |
9eb977db KS |
342 | */ |
343 | ||
afbae3e9 TH |
344 | if (isempty(path)) |
345 | return path; | |
346 | ||
cb71ed91 | 347 | if (path_is_absolute(path)) |
858d36c1 | 348 | f++; |
858d36c1 | 349 | |
cb71ed91 YW |
350 | for (const char *p = f;;) { |
351 | const char *e; | |
9eb977db | 352 | |
cb71ed91 YW |
353 | r = path_find_first_component(&p, true, &e); |
354 | if (r == 0) | |
355 | break; | |
9eb977db | 356 | |
cb71ed91 YW |
357 | if (add_slash) |
358 | *f++ = '/'; | |
858d36c1 | 359 | |
cb71ed91 YW |
360 | if (r < 0) { |
361 | /* if path is invalid, then refuse to simplify remaining part. */ | |
362 | memmove(f, p, strlen(p) + 1); | |
363 | return path; | |
9eb977db KS |
364 | } |
365 | ||
cb71ed91 YW |
366 | memmove(f, e, r); |
367 | f += r; | |
9eb977db | 368 | |
cb71ed91 | 369 | add_slash = true; |
afbae3e9 | 370 | } |
9eb977db | 371 | |
cb71ed91 YW |
372 | /* Special rule, if we stripped everything, we need a "." for the current directory. */ |
373 | if (f == path) | |
374 | *f++ = '.'; | |
375 | ||
376 | *f = '\0'; | |
9eb977db KS |
377 | return path; |
378 | } | |
379 | ||
b47aa73a ZJS |
380 | int path_simplify_and_warn( |
381 | char *path, | |
382 | unsigned flag, | |
383 | const char *unit, | |
384 | const char *filename, | |
385 | unsigned line, | |
386 | const char *lvalue) { | |
387 | ||
388 | bool fatal = flag & PATH_CHECK_FATAL; | |
389 | ||
390 | assert(!FLAGS_SET(flag, PATH_CHECK_ABSOLUTE | PATH_CHECK_RELATIVE)); | |
391 | ||
392 | if (!utf8_is_valid(path)) | |
393 | return log_syntax_invalid_utf8(unit, LOG_ERR, filename, line, path); | |
394 | ||
395 | if (flag & (PATH_CHECK_ABSOLUTE | PATH_CHECK_RELATIVE)) { | |
396 | bool absolute; | |
397 | ||
398 | absolute = path_is_absolute(path); | |
399 | ||
400 | if (!absolute && (flag & PATH_CHECK_ABSOLUTE)) | |
401 | return log_syntax(unit, LOG_ERR, filename, line, SYNTHETIC_ERRNO(EINVAL), | |
402 | "%s= path is not absolute%s: %s", | |
403 | lvalue, fatal ? "" : ", ignoring", path); | |
404 | ||
405 | if (absolute && (flag & PATH_CHECK_RELATIVE)) | |
406 | return log_syntax(unit, LOG_ERR, filename, line, SYNTHETIC_ERRNO(EINVAL), | |
407 | "%s= path is absolute%s: %s", | |
408 | lvalue, fatal ? "" : ", ignoring", path); | |
409 | } | |
410 | ||
4ff361cc | 411 | path_simplify(path); |
b47aa73a ZJS |
412 | |
413 | if (!path_is_valid(path)) | |
414 | return log_syntax(unit, LOG_ERR, filename, line, SYNTHETIC_ERRNO(EINVAL), | |
415 | "%s= path has invalid length (%zu bytes)%s.", | |
416 | lvalue, strlen(path), fatal ? "" : ", ignoring"); | |
417 | ||
418 | if (!path_is_normalized(path)) | |
419 | return log_syntax(unit, LOG_ERR, filename, line, SYNTHETIC_ERRNO(EINVAL), | |
420 | "%s= path is not normalized%s: %s", | |
421 | lvalue, fatal ? "" : ", ignoring", path); | |
422 | ||
423 | return 0; | |
424 | } | |
425 | ||
63f11e35 | 426 | char *path_startswith_full(const char *path, const char *prefix, bool accept_dot_dot) { |
9eb977db KS |
427 | assert(path); |
428 | assert(prefix); | |
429 | ||
0470289b ZJS |
430 | /* Returns a pointer to the start of the first component after the parts matched by |
431 | * the prefix, iff | |
432 | * - both paths are absolute or both paths are relative, | |
433 | * and | |
434 | * - each component in prefix in turn matches a component in path at the same position. | |
435 | * An empty string will be returned when the prefix and path are equivalent. | |
436 | * | |
437 | * Returns NULL otherwise. | |
438 | */ | |
439 | ||
9eb977db | 440 | if ((path[0] == '/') != (prefix[0] == '/')) |
424a19f8 | 441 | return NULL; |
9eb977db KS |
442 | |
443 | for (;;) { | |
63f11e35 YW |
444 | const char *p, *q; |
445 | int r, k; | |
9eb977db | 446 | |
63f11e35 YW |
447 | r = path_find_first_component(&path, accept_dot_dot, &p); |
448 | if (r < 0) | |
449 | return NULL; | |
9eb977db | 450 | |
63f11e35 YW |
451 | k = path_find_first_component(&prefix, accept_dot_dot, &q); |
452 | if (k < 0) | |
424a19f8 | 453 | return NULL; |
9eb977db | 454 | |
63f11e35 YW |
455 | if (k == 0) |
456 | return (char*) (p ?: path); | |
9eb977db | 457 | |
63f11e35 | 458 | if (r != k) |
424a19f8 | 459 | return NULL; |
9eb977db | 460 | |
63f11e35 | 461 | if (!strneq(p, q, r)) |
424a19f8 | 462 | return NULL; |
9eb977db KS |
463 | } |
464 | } | |
465 | ||
2230852b | 466 | int path_compare(const char *a, const char *b) { |
353df443 | 467 | int r; |
2230852b | 468 | |
10539677 LP |
469 | /* Order NULL before non-NULL */ |
470 | r = CMP(!!a, !!b); | |
471 | if (r != 0) | |
472 | return r; | |
9eb977db | 473 | |
f21f31b2 | 474 | /* A relative path and an absolute path must not compare as equal. |
2230852b MS |
475 | * Which one is sorted before the other does not really matter. |
476 | * Here a relative path is ordered before an absolute path. */ | |
353df443 YW |
477 | r = CMP(path_is_absolute(a), path_is_absolute(b)); |
478 | if (r != 0) | |
479 | return r; | |
9eb977db KS |
480 | |
481 | for (;;) { | |
353df443 YW |
482 | const char *aa, *bb; |
483 | int j, k; | |
9eb977db | 484 | |
353df443 YW |
485 | j = path_find_first_component(&a, true, &aa); |
486 | k = path_find_first_component(&b, true, &bb); | |
9eb977db | 487 | |
353df443 YW |
488 | if (j < 0 || k < 0) { |
489 | /* When one of paths is invalid, order invalid path after valid one. */ | |
490 | r = CMP(j < 0, k < 0); | |
491 | if (r != 0) | |
492 | return r; | |
493 | ||
494 | /* fallback to use strcmp() if both paths are invalid. */ | |
495 | return strcmp(a, b); | |
496 | } | |
9eb977db | 497 | |
2230852b | 498 | /* Order prefixes first: "/foo" before "/foo/bar" */ |
353df443 YW |
499 | if (j == 0) { |
500 | if (k == 0) | |
501 | return 0; | |
2230852b | 502 | return -1; |
353df443 YW |
503 | } |
504 | if (k == 0) | |
2230852b | 505 | return 1; |
9eb977db | 506 | |
2230852b | 507 | /* Alphabetical sort: "/foo/aaa" before "/foo/b" */ |
353df443 YW |
508 | r = memcmp(aa, bb, MIN(j, k)); |
509 | if (r != 0) | |
510 | return r; | |
9eb977db | 511 | |
2230852b | 512 | /* Sort "/foo/a" before "/foo/aaa" */ |
353df443 YW |
513 | r = CMP(j, k); |
514 | if (r != 0) | |
515 | return r; | |
9eb977db KS |
516 | } |
517 | } | |
518 | ||
e3f791a2 ZJS |
519 | bool path_equal_or_files_same(const char *a, const char *b, int flags) { |
520 | return path_equal(a, b) || files_same(a, b, flags) > 0; | |
c78e47a6 MS |
521 | } |
522 | ||
727e63e3 LB |
523 | bool path_equal_filename(const char *a, const char *b) { |
524 | _cleanup_free_ char *a_basename = NULL, *b_basename = NULL; | |
525 | int r; | |
526 | ||
527 | assert(a); | |
528 | assert(b); | |
529 | ||
530 | r = path_extract_filename(a, &a_basename); | |
531 | if (r < 0) { | |
532 | log_debug_errno(r, "Failed to parse basename of %s: %m", a); | |
533 | return false; | |
534 | } | |
535 | r = path_extract_filename(b, &b_basename); | |
536 | if (r < 0) { | |
537 | log_debug_errno(r, "Failed to parse basename of %s: %m", b); | |
538 | return false; | |
539 | } | |
540 | ||
541 | return path_equal(a_basename, b_basename); | |
542 | } | |
543 | ||
7ae27680 LP |
544 | char* path_extend_internal(char **x, ...) { |
545 | size_t sz, old_sz; | |
546 | char *q, *nx; | |
cd8194a3 LP |
547 | const char *p; |
548 | va_list ap; | |
549 | bool slash; | |
cd8194a3 | 550 | |
652ef298 ZJS |
551 | /* Joins all listed strings until the sentinel and places a "/" between them unless the strings end/begin |
552 | * already with one so that it is unnecessary. Note that slashes which are already duplicate won't be | |
553 | * removed. The string returned is hence always equal to or longer than the sum of the lengths of each | |
554 | * individual string. | |
cd8194a3 | 555 | * |
7ae27680 LP |
556 | * The first argument may be an already allocated string that is extended via realloc() if |
557 | * non-NULL. path_extend() and path_join() are macro wrappers around this function, making use of the | |
558 | * first parameter to distinguish the two operations. | |
559 | * | |
cd8194a3 LP |
560 | * Note: any listed empty string is simply skipped. This can be useful for concatenating strings of which some |
561 | * are optional. | |
562 | * | |
563 | * Examples: | |
564 | * | |
62a85ee0 ZJS |
565 | * path_join("foo", "bar") → "foo/bar" |
566 | * path_join("foo/", "bar") → "foo/bar" | |
567 | * path_join("", "foo", "", "bar", "") → "foo/bar" */ | |
cd8194a3 | 568 | |
7ae27680 LP |
569 | sz = old_sz = x ? strlen_ptr(*x) : 0; |
570 | va_start(ap, x); | |
571 | while ((p = va_arg(ap, char*)) != POINTER_MAX) { | |
572 | size_t add; | |
573 | ||
574 | if (isempty(p)) | |
575 | continue; | |
576 | ||
577 | add = 1 + strlen(p); | |
50fd596e YW |
578 | if (sz > SIZE_MAX - add) { /* overflow check */ |
579 | va_end(ap); | |
7ae27680 | 580 | return NULL; |
50fd596e | 581 | } |
7ae27680 LP |
582 | |
583 | sz += add; | |
584 | } | |
cd8194a3 LP |
585 | va_end(ap); |
586 | ||
7ae27680 LP |
587 | nx = realloc(x ? *x : NULL, GREEDY_ALLOC_ROUND_UP(sz+1)); |
588 | if (!nx) | |
cd8194a3 | 589 | return NULL; |
7ae27680 LP |
590 | if (x) |
591 | *x = nx; | |
cd8194a3 | 592 | |
7ae27680 | 593 | if (old_sz > 0) |
340cd6b6 | 594 | slash = nx[old_sz-1] == '/'; |
7ae27680 LP |
595 | else { |
596 | nx[old_sz] = 0; | |
cd8194a3 LP |
597 | slash = true; /* no need to generate a slash anymore */ |
598 | } | |
599 | ||
7ae27680 LP |
600 | q = nx + old_sz; |
601 | ||
602 | va_start(ap, x); | |
66032ef4 | 603 | while ((p = va_arg(ap, char*)) != POINTER_MAX) { |
652ef298 | 604 | if (isempty(p)) |
cd8194a3 LP |
605 | continue; |
606 | ||
607 | if (!slash && p[0] != '/') | |
608 | *(q++) = '/'; | |
609 | ||
610 | q = stpcpy(q, p); | |
611 | slash = endswith(p, "/"); | |
612 | } | |
613 | va_end(ap); | |
614 | ||
7ae27680 | 615 | return nx; |
cd8194a3 LP |
616 | } |
617 | ||
5ca9139a | 618 | static int check_x_access(const char *path, int *ret_fd) { |
ece852c8 | 619 | _cleanup_close_ int fd = -1; |
ece852c8 | 620 | int r; |
5ca9139a | 621 | |
888f65ac YW |
622 | /* We need to use O_PATH because there may be executables for which we have only exec |
623 | * permissions, but not read (usually suid executables). */ | |
624 | fd = open(path, O_PATH|O_CLOEXEC); | |
625 | if (fd < 0) | |
626 | return -errno; | |
ece852c8 | 627 | |
888f65ac YW |
628 | r = fd_verify_regular(fd); |
629 | if (r < 0) | |
630 | return r; | |
ece852c8 | 631 | |
888f65ac | 632 | r = access_fd(fd, X_OK); |
93413acd YW |
633 | if (r == -ENOSYS) { |
634 | /* /proc is not mounted. Fallback to access(). */ | |
635 | if (access(path, X_OK) < 0) | |
636 | return -errno; | |
637 | } else if (r < 0) | |
888f65ac | 638 | return r; |
ece852c8 YW |
639 | |
640 | if (ret_fd) | |
641 | *ret_fd = TAKE_FD(fd); | |
642 | ||
5ca9139a ZJS |
643 | return 0; |
644 | } | |
645 | ||
ded8039a YW |
646 | static int find_executable_impl(const char *name, const char *root, char **ret_filename, int *ret_fd) { |
647 | _cleanup_close_ int fd = -1; | |
648 | _cleanup_free_ char *path_name = NULL; | |
649 | int r; | |
85eca92e | 650 | |
c9d954b2 | 651 | assert(name); |
4087cb9e | 652 | |
ded8039a YW |
653 | /* Function chase_symlinks() is invoked only when root is not NULL, as using it regardless of |
654 | * root value would alter the behavior of existing callers for example: /bin/sleep would become | |
655 | * /usr/bin/sleep when find_executables is called. Hence, this function should be invoked when | |
656 | * needed to avoid unforeseen regression or other complicated changes. */ | |
657 | if (root) { | |
658 | r = chase_symlinks(name, | |
659 | root, | |
660 | CHASE_PREFIX_ROOT, | |
661 | &path_name, | |
662 | /* ret_fd= */ NULL); /* prefix root to name in case full paths are not specified */ | |
663 | if (r < 0) | |
664 | return r; | |
36f4af05 | 665 | |
ded8039a YW |
666 | name = path_name; |
667 | } | |
36f4af05 | 668 | |
ded8039a YW |
669 | r = check_x_access(name, ret_fd ? &fd : NULL); |
670 | if (r < 0) | |
671 | return r; | |
b972115c | 672 | |
ded8039a YW |
673 | if (ret_filename) { |
674 | r = path_make_absolute_cwd(name, ret_filename); | |
5ca9139a ZJS |
675 | if (r < 0) |
676 | return r; | |
ded8039a | 677 | } |
5ca9139a | 678 | |
ded8039a YW |
679 | if (ret_fd) |
680 | *ret_fd = TAKE_FD(fd); | |
c9d954b2 | 681 | |
ded8039a YW |
682 | return 0; |
683 | } | |
5ca9139a | 684 | |
ded8039a YW |
685 | int find_executable_full(const char *name, const char *root, bool use_path_envvar, char **ret_filename, int *ret_fd) { |
686 | int last_error, r; | |
687 | const char *p = NULL; | |
688 | ||
689 | assert(name); | |
690 | ||
691 | if (is_path(name)) | |
692 | return find_executable_impl(name, root, ret_filename, ret_fd); | |
c9d954b2 | 693 | |
92673045 ZJS |
694 | if (use_path_envvar) |
695 | /* Plain getenv, not secure_getenv, because we want to actually allow the user to pick the | |
696 | * binary. */ | |
697 | p = getenv("PATH"); | |
85eca92e LP |
698 | if (!p) |
699 | p = DEFAULT_PATH; | |
700 | ||
701 | last_error = -ENOENT; | |
702 | ||
5ca9139a | 703 | /* Resolve a single-component name to a full path */ |
85eca92e | 704 | for (;;) { |
4ede9802 | 705 | _cleanup_free_ char *element = NULL; |
85eca92e LP |
706 | |
707 | r = extract_first_word(&p, &element, ":", EXTRACT_RELAX|EXTRACT_DONT_COALESCE_SEPARATORS); | |
708 | if (r < 0) | |
709 | return r; | |
710 | if (r == 0) | |
711 | break; | |
712 | ||
0f474365 LP |
713 | if (!path_is_absolute(element)) |
714 | continue; | |
715 | ||
4ede9802 | 716 | if (!path_extend(&element, name)) |
85eca92e LP |
717 | return -ENOMEM; |
718 | ||
ded8039a | 719 | r = find_executable_impl(element, root, ret_filename, ret_fd); |
ece852c8 YW |
720 | if (r < 0) { |
721 | /* PATH entries which we don't have access to are ignored, as per tradition. */ | |
722 | if (r != -EACCES) | |
723 | last_error = r; | |
724 | continue; | |
c9d954b2 ZJS |
725 | } |
726 | ||
ece852c8 | 727 | /* Found it! */ |
ece852c8 | 728 | return 0; |
c9d954b2 | 729 | } |
85eca92e LP |
730 | |
731 | return last_error; | |
c9d954b2 | 732 | } |
8e184852 | 733 | |
2ad8416d | 734 | bool paths_check_timestamp(const char* const* paths, usec_t *timestamp, bool update) { |
0d5a24be | 735 | bool changed = false, originally_unset; |
2ad8416d | 736 | const char* const* i; |
8e184852 | 737 | |
97f2d76d TG |
738 | assert(timestamp); |
739 | ||
234519ae | 740 | if (!paths) |
4087cb9e | 741 | return false; |
8e184852 | 742 | |
0d5a24be ZJS |
743 | originally_unset = *timestamp == 0; |
744 | ||
4087cb9e | 745 | STRV_FOREACH(i, paths) { |
8e184852 | 746 | struct stat stats; |
4087cb9e | 747 | usec_t u; |
8e184852 | 748 | |
4087cb9e | 749 | if (stat(*i, &stats) < 0) |
8e184852 TG |
750 | continue; |
751 | ||
4087cb9e LP |
752 | u = timespec_load(&stats.st_mtim); |
753 | ||
0d5a24be | 754 | /* check first */ |
4087cb9e | 755 | if (*timestamp >= u) |
8e184852 TG |
756 | continue; |
757 | ||
0d5a24be | 758 | log_debug(originally_unset ? "Loaded timestamp for '%s'." : "Timestamp of '%s' changed.", *i); |
8e184852 TG |
759 | |
760 | /* update timestamp */ | |
4087cb9e LP |
761 | if (update) { |
762 | *timestamp = u; | |
763 | changed = true; | |
764 | } else | |
765 | return true; | |
8e184852 | 766 | } |
4087cb9e | 767 | |
8e184852 TG |
768 | return changed; |
769 | } | |
eb66db55 | 770 | |
f7bc0c32 | 771 | static int executable_is_good(const char *executable) { |
571d0134 | 772 | _cleanup_free_ char *p = NULL, *d = NULL; |
571d0134 | 773 | int r; |
eb66db55 | 774 | |
f7bc0c32 | 775 | r = find_executable(executable, &p); |
85eca92e LP |
776 | if (r == -ENOENT) |
777 | return 0; | |
571d0134 LP |
778 | if (r < 0) |
779 | return r; | |
780 | ||
f7bc0c32 | 781 | /* An fsck that is linked to /bin/true is a non-existent fsck */ |
571d0134 LP |
782 | |
783 | r = readlink_malloc(p, &d); | |
85eca92e LP |
784 | if (r == -EINVAL) /* not a symlink */ |
785 | return 1; | |
786 | if (r < 0) | |
787 | return r; | |
571d0134 | 788 | |
3ae5990c ZJS |
789 | return !PATH_IN_SET(d, "true" |
790 | "/bin/true", | |
791 | "/usr/bin/true", | |
792 | "/dev/null"); | |
eb66db55 | 793 | } |
1d13f648 | 794 | |
5bcd08db LP |
795 | int fsck_exists(const char *fstype) { |
796 | const char *checker; | |
797 | ||
85eca92e | 798 | assert(fstype); |
5bcd08db | 799 | |
85eca92e LP |
800 | if (streq(fstype, "auto")) |
801 | return -EINVAL; | |
802 | ||
803 | checker = strjoina("fsck.", fstype); | |
f7bc0c32 | 804 | return executable_is_good(checker); |
5bcd08db LP |
805 | } |
806 | ||
5f311f8c LP |
807 | char* dirname_malloc(const char *path) { |
808 | char *d, *dir, *dir2; | |
809 | ||
810 | assert(path); | |
811 | ||
812 | d = strdup(path); | |
813 | if (!d) | |
814 | return NULL; | |
815 | ||
816 | dir = dirname(d); | |
817 | assert(dir); | |
818 | ||
819 | if (dir == d) | |
820 | return d; | |
821 | ||
822 | dir2 = strdup(dir); | |
823 | free(d); | |
824 | ||
825 | return dir2; | |
826 | } | |
bb15fafe | 827 | |
0ee54dd4 YW |
828 | static const char *skip_slash_or_dot(const char *p) { |
829 | for (; !isempty(p); p++) { | |
830 | if (*p == '/') | |
831 | continue; | |
832 | if (startswith(p, "./")) { | |
833 | p++; | |
834 | continue; | |
835 | } | |
836 | break; | |
837 | } | |
838 | return p; | |
839 | } | |
840 | ||
841 | int path_find_first_component(const char **p, bool accept_dot_dot, const char **ret) { | |
842 | const char *q, *first, *end_first, *next; | |
843 | size_t len; | |
844 | ||
845 | assert(p); | |
846 | ||
847 | /* When a path is input, then returns the pointer to the first component and its length, and | |
848 | * move the input pointer to the next component or nul. This skips both over any '/' | |
849 | * immediately *before* and *after* the first component before returning. | |
850 | * | |
851 | * Examples | |
852 | * Input: p: "//.//aaa///bbbbb/cc" | |
853 | * Output: p: "bbbbb///cc" | |
854 | * ret: "aaa///bbbbb/cc" | |
855 | * return value: 3 (== strlen("aaa")) | |
856 | * | |
857 | * Input: p: "aaa//" | |
858 | * Output: p: (pointer to NUL) | |
859 | * ret: "aaa//" | |
860 | * return value: 3 (== strlen("aaa")) | |
861 | * | |
862 | * Input: p: "/", ".", "" | |
863 | * Output: p: (pointer to NUL) | |
864 | * ret: NULL | |
865 | * return value: 0 | |
866 | * | |
867 | * Input: p: NULL | |
868 | * Output: p: NULL | |
869 | * ret: NULL | |
870 | * return value: 0 | |
871 | * | |
872 | * Input: p: "(too long component)" | |
873 | * Output: return value: -EINVAL | |
874 | * | |
875 | * (when accept_dot_dot is false) | |
876 | * Input: p: "//..//aaa///bbbbb/cc" | |
877 | * Output: return value: -EINVAL | |
878 | */ | |
879 | ||
880 | q = *p; | |
881 | ||
882 | first = skip_slash_or_dot(q); | |
883 | if (isempty(first)) { | |
884 | *p = first; | |
885 | if (ret) | |
886 | *ret = NULL; | |
887 | return 0; | |
888 | } | |
889 | if (streq(first, ".")) { | |
890 | *p = first + 1; | |
891 | if (ret) | |
892 | *ret = NULL; | |
893 | return 0; | |
894 | } | |
895 | ||
896 | end_first = strchrnul(first, '/'); | |
897 | len = end_first - first; | |
898 | ||
899 | if (len > NAME_MAX) | |
900 | return -EINVAL; | |
901 | if (!accept_dot_dot && len == 2 && first[0] == '.' && first[1] == '.') | |
902 | return -EINVAL; | |
903 | ||
904 | next = skip_slash_or_dot(end_first); | |
905 | ||
906 | *p = next + streq(next, "."); | |
907 | if (ret) | |
908 | *ret = first; | |
909 | return len; | |
910 | } | |
911 | ||
484cd43c YW |
912 | static const char *skip_slash_or_dot_backward(const char *path, const char *q) { |
913 | assert(path); | |
914 | ||
915 | for (; q >= path; q--) { | |
916 | if (*q == '/') | |
917 | continue; | |
918 | if (q > path && strneq(q - 1, "/.", 2)) | |
919 | continue; | |
920 | break; | |
921 | } | |
922 | return q; | |
923 | } | |
924 | ||
925 | int path_find_last_component(const char *path, bool accept_dot_dot, const char **next, const char **ret) { | |
926 | const char *q, *last_end, *last_begin; | |
927 | size_t len; | |
928 | ||
929 | /* Similar to path_find_first_component(), but search components from the end. | |
930 | * | |
931 | * Examples | |
932 | * Input: path: "//.//aaa///bbbbb/cc//././" | |
933 | * next: NULL | |
934 | * Output: next: "/cc//././" | |
935 | * ret: "cc//././" | |
936 | * return value: 2 (== strlen("cc")) | |
937 | * | |
938 | * Input: path: "//.//aaa///bbbbb/cc//././" | |
939 | * next: "/cc//././" | |
940 | * Output: next: "///bbbbb/cc//././" | |
941 | * ret: "bbbbb/cc//././" | |
942 | * return value: 5 (== strlen("bbbbb")) | |
943 | * | |
944 | * Input: path: "/", ".", "", or NULL | |
945 | * Output: next: equivalent to path | |
946 | * ret: NULL | |
947 | * return value: 0 | |
948 | * | |
949 | * Input: path: "(too long component)" | |
950 | * Output: return value: -EINVAL | |
951 | * | |
952 | * (when accept_dot_dot is false) | |
953 | * Input: path: "//..//aaa///bbbbb/cc/..//" | |
954 | * Output: return value: -EINVAL | |
955 | */ | |
956 | ||
957 | if (isempty(path)) { | |
958 | if (next) | |
959 | *next = path; | |
960 | if (ret) | |
961 | *ret = NULL; | |
962 | return 0; | |
963 | } | |
964 | ||
965 | if (next && *next) { | |
966 | if (*next < path || *next > path + strlen(path)) | |
967 | return -EINVAL; | |
968 | if (*next == path) { | |
969 | if (ret) | |
970 | *ret = NULL; | |
971 | return 0; | |
972 | } | |
973 | if (!IN_SET(**next, '\0', '/')) | |
974 | return -EINVAL; | |
975 | q = *next - 1; | |
976 | } else | |
977 | q = path + strlen(path) - 1; | |
978 | ||
979 | q = skip_slash_or_dot_backward(path, q); | |
980 | if ((q < path) || /* the root directory */ | |
981 | (q == path && *q == '.')) { /* path is "." or "./" */ | |
982 | if (next) | |
983 | *next = path; | |
984 | if (ret) | |
985 | *ret = NULL; | |
986 | return 0; | |
987 | } | |
988 | ||
989 | last_end = q + 1; | |
990 | ||
991 | while (q >= path && *q != '/') | |
992 | q--; | |
993 | ||
994 | last_begin = q + 1; | |
995 | len = last_end - last_begin; | |
996 | ||
997 | if (len > NAME_MAX) | |
998 | return -EINVAL; | |
999 | if (!accept_dot_dot && len == 2 && strneq(last_begin, "..", 2)) | |
1000 | return -EINVAL; | |
1001 | ||
1002 | if (next) { | |
1003 | q = skip_slash_or_dot_backward(path, q); | |
1004 | if (q < path) | |
1005 | *next = path; | |
1006 | else | |
1007 | *next = q + 1; | |
1008 | } | |
1009 | ||
1010 | if (ret) | |
1011 | *ret = last_begin; | |
1012 | return len; | |
1013 | } | |
1014 | ||
b12d25a8 | 1015 | const char *last_path_component(const char *path) { |
8460289f LP |
1016 | |
1017 | /* Finds the last component of the path, preserving the optional trailing slash that signifies a directory. | |
1018 | * | |
b12d25a8 ZJS |
1019 | * a/b/c → c |
1020 | * a/b/c/ → c/ | |
8460289f LP |
1021 | * x → x |
1022 | * x/ → x/ | |
1023 | * /y → y | |
1024 | * /y/ → y/ | |
b12d25a8 ZJS |
1025 | * / → / |
1026 | * // → / | |
1027 | * /foo/a → a | |
1028 | * /foo/a/ → a/ | |
8460289f LP |
1029 | * |
1030 | * Also, the empty string is mapped to itself. | |
1031 | * | |
1032 | * This is different than basename(), which returns "" when a trailing slash is present. | |
3cdcbdd3 LP |
1033 | * |
1034 | * This always succeeds (except if you pass NULL in which case it returns NULL, too). | |
b12d25a8 ZJS |
1035 | */ |
1036 | ||
1037 | unsigned l, k; | |
1038 | ||
77e0a1b5 LP |
1039 | if (!path) |
1040 | return NULL; | |
1041 | ||
b12d25a8 | 1042 | l = k = strlen(path); |
69f9ccf1 ZJS |
1043 | if (l == 0) /* special case — an empty string */ |
1044 | return path; | |
1045 | ||
b12d25a8 ZJS |
1046 | while (k > 0 && path[k-1] == '/') |
1047 | k--; | |
1048 | ||
1049 | if (k == 0) /* the root directory */ | |
1050 | return path + l - 1; | |
1051 | ||
1052 | while (k > 0 && path[k-1] != '/') | |
1053 | k--; | |
1054 | ||
1055 | return path + k; | |
1056 | } | |
1057 | ||
01950464 | 1058 | int path_extract_filename(const char *path, char **ret) { |
a60c8eee | 1059 | _cleanup_free_ char *a = NULL; |
01950464 YW |
1060 | const char *c, *next = NULL; |
1061 | int r; | |
a60c8eee LP |
1062 | |
1063 | /* Extracts the filename part (i.e. right-most component) from a path, i.e. string that passes | |
ee277c6b LP |
1064 | * filename_is_valid(). A wrapper around last_path_component(), but eats up trailing |
1065 | * slashes. Returns: | |
1066 | * | |
01950464 YW |
1067 | * -EINVAL → if the path is not valid |
1068 | * -EADDRNOTAVAIL → if only a directory was specified, but no filename, i.e. the root dir | |
1069 | * itself or "." is specified | |
ee277c6b LP |
1070 | * -ENOMEM → no memory |
1071 | * | |
01950464 YW |
1072 | * Returns >= 0 on success. If the input path has a trailing slash, returns O_DIRECTORY, to |
1073 | * indicate the referenced file must be a directory. | |
ee277c6b LP |
1074 | * |
1075 | * This function guarantees to return a fully valid filename, i.e. one that passes | |
1076 | * filename_is_valid() – this means "." and ".." are not accepted. */ | |
a60c8eee | 1077 | |
01950464 | 1078 | if (!path_is_valid(path)) |
a60c8eee LP |
1079 | return -EINVAL; |
1080 | ||
01950464 YW |
1081 | r = path_find_last_component(path, false, &next, &c); |
1082 | if (r < 0) | |
1083 | return r; | |
1084 | if (r == 0) /* root directory */ | |
3cdcbdd3 | 1085 | return -EADDRNOTAVAIL; |
a60c8eee | 1086 | |
01950464 | 1087 | a = strndup(c, r); |
a60c8eee LP |
1088 | if (!a) |
1089 | return -ENOMEM; | |
1090 | ||
a60c8eee | 1091 | *ret = TAKE_PTR(a); |
01950464 | 1092 | return strlen(c) > (size_t)r ? O_DIRECTORY : 0; |
a60c8eee LP |
1093 | } |
1094 | ||
01950464 | 1095 | int path_extract_directory(const char *path, char **ret) { |
8dcb891c | 1096 | _cleanup_free_ char *a = NULL; |
01950464 YW |
1097 | const char *c, *next = NULL; |
1098 | int r; | |
8dcb891c LP |
1099 | |
1100 | /* The inverse of path_extract_filename(), i.e. returns the directory path prefix. Returns: | |
1101 | * | |
01950464 | 1102 | * -EINVAL → if the path is not valid |
8dcb891c | 1103 | * -EDESTADDRREQ → if no directory was specified in the passed in path, i.e. only a filename was passed |
01950464 YW |
1104 | * -EADDRNOTAVAIL → if the passed in parameter had no filename but did have a directory, i.e. |
1105 | * the root dir itself or "." was specified | |
8dcb891c LP |
1106 | * -ENOMEM → no memory (surprise!) |
1107 | * | |
1108 | * This function guarantees to return a fully valid path, i.e. one that passes path_is_valid(). | |
1109 | */ | |
1110 | ||
01950464 YW |
1111 | r = path_find_last_component(path, false, &next, &c); |
1112 | if (r < 0) | |
1113 | return r; | |
1114 | if (r == 0) /* empty or root */ | |
1115 | return isempty(path) ? -EINVAL : -EADDRNOTAVAIL; | |
1116 | if (next == path) { | |
1117 | if (*path != '/') /* filename only */ | |
1118 | return -EDESTADDRREQ; | |
1119 | ||
1120 | a = strdup("/"); | |
1121 | if (!a) | |
1122 | return -ENOMEM; | |
1123 | *ret = TAKE_PTR(a); | |
1124 | return 0; | |
1125 | } | |
8dcb891c | 1126 | |
01950464 | 1127 | a = strndup(path, next - path); |
8dcb891c LP |
1128 | if (!a) |
1129 | return -ENOMEM; | |
1130 | ||
4ff361cc | 1131 | path_simplify(a); |
01950464 | 1132 | |
8dcb891c LP |
1133 | if (!path_is_valid(a)) |
1134 | return -EINVAL; | |
1135 | ||
1136 | *ret = TAKE_PTR(a); | |
1137 | return 0; | |
1138 | } | |
1139 | ||
bb15fafe LP |
1140 | bool filename_is_valid(const char *p) { |
1141 | const char *e; | |
1142 | ||
1143 | if (isempty(p)) | |
1144 | return false; | |
1145 | ||
49bfc877 | 1146 | if (dot_or_dot_dot(p)) |
bb15fafe LP |
1147 | return false; |
1148 | ||
1149 | e = strchrnul(p, '/'); | |
1150 | if (*e != 0) | |
1151 | return false; | |
1152 | ||
2ef2376d | 1153 | if (e - p > NAME_MAX) /* NAME_MAX is counted *without* the trailing NUL byte */ |
bb15fafe LP |
1154 | return false; |
1155 | ||
1156 | return true; | |
1157 | } | |
1158 | ||
32df2e14 | 1159 | bool path_is_valid_full(const char *p, bool accept_dot_dot) { |
bb15fafe LP |
1160 | if (isempty(p)) |
1161 | return false; | |
1162 | ||
2ef2376d | 1163 | for (const char *e = p;;) { |
66368835 YW |
1164 | int r; |
1165 | ||
32df2e14 | 1166 | r = path_find_first_component(&e, accept_dot_dot, NULL); |
66368835 YW |
1167 | if (r < 0) |
1168 | return false; | |
49bfc877 | 1169 | |
2ef2376d LP |
1170 | if (e - p >= PATH_MAX) /* Already reached the maximum length for a path? (PATH_MAX is counted |
1171 | * *with* the trailing NUL byte) */ | |
1172 | return false; | |
1173 | if (*e == 0) /* End of string? Yay! */ | |
1174 | return true; | |
2ef2376d | 1175 | } |
656552eb LP |
1176 | } |
1177 | ||
1178 | bool path_is_normalized(const char *p) { | |
0b869625 | 1179 | if (!path_is_safe(p)) |
bb15fafe LP |
1180 | return false; |
1181 | ||
0b869625 | 1182 | if (streq(p, ".") || startswith(p, "./") || endswith(p, "/.") || strstr(p, "/./")) |
bb15fafe LP |
1183 | return false; |
1184 | ||
1185 | if (strstr(p, "//")) | |
1186 | return false; | |
1187 | ||
1188 | return true; | |
1189 | } | |
a0956174 LP |
1190 | |
1191 | char *file_in_same_dir(const char *path, const char *filename) { | |
1192 | char *e, *ret; | |
1193 | size_t k; | |
1194 | ||
1195 | assert(path); | |
1196 | assert(filename); | |
1197 | ||
1198 | /* This removes the last component of path and appends | |
1199 | * filename, unless the latter is absolute anyway or the | |
1200 | * former isn't */ | |
1201 | ||
1202 | if (path_is_absolute(filename)) | |
1203 | return strdup(filename); | |
1204 | ||
1205 | e = strrchr(path, '/'); | |
1206 | if (!e) | |
1207 | return strdup(filename); | |
1208 | ||
1209 | k = strlen(filename); | |
1210 | ret = new(char, (e + 1 - path) + k + 1); | |
1211 | if (!ret) | |
1212 | return NULL; | |
1213 | ||
1214 | memcpy(mempcpy(ret, path, e + 1 - path), filename, k + 1); | |
1215 | return ret; | |
1216 | } | |
1217 | ||
55cdd057 ZJS |
1218 | bool hidden_or_backup_file(const char *filename) { |
1219 | const char *p; | |
a0956174 | 1220 | |
a0956174 LP |
1221 | assert(filename); |
1222 | ||
55cdd057 ZJS |
1223 | if (filename[0] == '.' || |
1224 | streq(filename, "lost+found") || | |
1225 | streq(filename, "aquota.user") || | |
1226 | streq(filename, "aquota.group") || | |
1227 | endswith(filename, "~")) | |
a0956174 LP |
1228 | return true; |
1229 | ||
55cdd057 ZJS |
1230 | p = strrchr(filename, '.'); |
1231 | if (!p) | |
1232 | return false; | |
1233 | ||
941060bf LP |
1234 | /* Please, let's not add more entries to the list below. If external projects think it's a good idea to come up |
1235 | * with always new suffixes and that everybody else should just adjust to that, then it really should be on | |
1236 | * them. Hence, in future, let's not add any more entries. Instead, let's ask those packages to instead adopt | |
1237 | * one of the generic suffixes/prefixes for hidden files or backups, possibly augmented with an additional | |
1238 | * string. Specifically: there's now: | |
1239 | * | |
1240 | * The generic suffixes "~" and ".bak" for backup files | |
1241 | * The generic prefix "." for hidden files | |
1242 | * | |
94a0ef6e ZJS |
1243 | * Thus, if a new package manager "foopkg" wants its own set of ".foopkg-new", ".foopkg-old", ".foopkg-dist" |
1244 | * or so registered, let's refuse that and ask them to use ".foopkg.new", ".foopkg.old" or ".foopkg~" instead. | |
941060bf LP |
1245 | */ |
1246 | ||
55cdd057 ZJS |
1247 | return STR_IN_SET(p + 1, |
1248 | "rpmnew", | |
1249 | "rpmsave", | |
1250 | "rpmorig", | |
1251 | "dpkg-old", | |
1252 | "dpkg-new", | |
1253 | "dpkg-tmp", | |
1254 | "dpkg-dist", | |
1255 | "dpkg-bak", | |
1256 | "dpkg-backup", | |
1257 | "dpkg-remove", | |
1258 | "ucf-new", | |
1259 | "ucf-old", | |
1260 | "ucf-dist", | |
941060bf | 1261 | "swp", |
94a0ef6e ZJS |
1262 | "bak", |
1263 | "old", | |
1264 | "new"); | |
a0956174 LP |
1265 | } |
1266 | ||
1267 | bool is_device_path(const char *path) { | |
1268 | ||
bae47ba7 | 1269 | /* Returns true on paths that likely refer to a device, either by path in sysfs or to something in /dev */ |
a0956174 | 1270 | |
bae47ba7 | 1271 | return PATH_STARTSWITH_SET(path, "/dev/", "/sys/"); |
3ccb8862 ZJS |
1272 | } |
1273 | ||
57e84e75 LP |
1274 | bool valid_device_node_path(const char *path) { |
1275 | ||
1276 | /* Some superficial checks whether the specified path is a valid device node path, all without looking at the | |
1277 | * actual device node. */ | |
1278 | ||
1279 | if (!PATH_STARTSWITH_SET(path, "/dev/", "/run/systemd/inaccessible/")) | |
1280 | return false; | |
1281 | ||
1282 | if (endswith(path, "/")) /* can't be a device node if it ends in a slash */ | |
1283 | return false; | |
1284 | ||
1285 | return path_is_normalized(path); | |
1286 | } | |
1287 | ||
1288 | bool valid_device_allow_pattern(const char *path) { | |
1289 | assert(path); | |
1290 | ||
1291 | /* Like valid_device_node_path(), but also allows full-subsystem expressions, like DeviceAllow= and DeviceDeny= | |
1292 | * accept it */ | |
1293 | ||
49fe5c09 | 1294 | if (STARTSWITH_SET(path, "block-", "char-")) |
57e84e75 LP |
1295 | return true; |
1296 | ||
1297 | return valid_device_node_path(path); | |
a0956174 | 1298 | } |
5a46d55f ZJS |
1299 | |
1300 | int systemd_installation_has_version(const char *root, unsigned minimal_version) { | |
1301 | const char *pattern; | |
1302 | int r; | |
1303 | ||
1304 | /* Try to guess if systemd installation is later than the specified version. This | |
1305 | * is hacky and likely to yield false negatives, particularly if the installation | |
1306 | * is non-standard. False positives should be relatively rare. | |
1307 | */ | |
1308 | ||
1309 | NULSTR_FOREACH(pattern, | |
1310 | /* /lib works for systems without usr-merge, and for systems with a sane | |
1311 | * usr-merge, where /lib is a symlink to /usr/lib. /usr/lib is necessary | |
1312 | * for Gentoo which does a merge without making /lib a symlink. | |
1313 | */ | |
1314 | "lib/systemd/libsystemd-shared-*.so\0" | |
28faeda4 LP |
1315 | "lib64/systemd/libsystemd-shared-*.so\0" |
1316 | "usr/lib/systemd/libsystemd-shared-*.so\0" | |
1317 | "usr/lib64/systemd/libsystemd-shared-*.so\0") { | |
5a46d55f ZJS |
1318 | |
1319 | _cleanup_strv_free_ char **names = NULL; | |
1320 | _cleanup_free_ char *path = NULL; | |
1321 | char *c, **name; | |
1322 | ||
c6134d3e | 1323 | path = path_join(root, pattern); |
5a46d55f ZJS |
1324 | if (!path) |
1325 | return -ENOMEM; | |
1326 | ||
544e146b | 1327 | r = glob_extend(&names, path, 0); |
5a46d55f ZJS |
1328 | if (r == -ENOENT) |
1329 | continue; | |
1330 | if (r < 0) | |
1331 | return r; | |
1332 | ||
dcd6361e | 1333 | assert_se(c = endswith(path, "*.so")); |
5a46d55f ZJS |
1334 | *c = '\0'; /* truncate the glob part */ |
1335 | ||
1336 | STRV_FOREACH(name, names) { | |
1337 | /* This is most likely to run only once, hence let's not optimize anything. */ | |
1338 | char *t, *t2; | |
1339 | unsigned version; | |
1340 | ||
1341 | t = startswith(*name, path); | |
1342 | if (!t) | |
1343 | continue; | |
1344 | ||
1345 | t2 = endswith(t, ".so"); | |
1346 | if (!t2) | |
1347 | continue; | |
1348 | ||
1349 | t2[0] = '\0'; /* truncate the suffix */ | |
1350 | ||
1351 | r = safe_atou(t, &version); | |
1352 | if (r < 0) { | |
1353 | log_debug_errno(r, "Found libsystemd shared at \"%s.so\", but failed to parse version: %m", *name); | |
1354 | continue; | |
1355 | } | |
1356 | ||
1357 | log_debug("Found libsystemd shared at \"%s.so\", version %u (%s).", | |
1358 | *name, version, | |
1359 | version >= minimal_version ? "OK" : "too old"); | |
1360 | if (version >= minimal_version) | |
1361 | return true; | |
1362 | } | |
1363 | } | |
1364 | ||
1365 | return false; | |
1366 | } | |
49bfc877 LP |
1367 | |
1368 | bool dot_or_dot_dot(const char *path) { | |
1369 | if (!path) | |
1370 | return false; | |
1371 | if (path[0] != '.') | |
1372 | return false; | |
1373 | if (path[1] == 0) | |
1374 | return true; | |
1375 | if (path[1] != '.') | |
1376 | return false; | |
1377 | ||
1378 | return path[2] == 0; | |
1379 | } | |
57ea45e1 | 1380 | |
15bac3e8 | 1381 | bool empty_or_root(const char *path) { |
57ea45e1 LP |
1382 | |
1383 | /* For operations relative to some root directory, returns true if the specified root directory is redundant, | |
1384 | * i.e. either / or NULL or the empty string or any equivalent. */ | |
1385 | ||
15bac3e8 | 1386 | if (isempty(path)) |
57ea45e1 LP |
1387 | return true; |
1388 | ||
15bac3e8 | 1389 | return path_equal(path, "/"); |
57ea45e1 | 1390 | } |
3841fee8 LP |
1391 | |
1392 | bool path_strv_contains(char **l, const char *path) { | |
1393 | char **i; | |
1394 | ||
1395 | STRV_FOREACH(i, l) | |
1396 | if (path_equal(*i, path)) | |
1397 | return true; | |
1398 | ||
1399 | return false; | |
1400 | } | |
de46b2be TM |
1401 | |
1402 | bool prefixed_path_strv_contains(char **l, const char *path) { | |
1403 | char **i, *j; | |
1404 | ||
1405 | STRV_FOREACH(i, l) { | |
1406 | j = *i; | |
1407 | if (*j == '-') | |
1408 | j++; | |
1409 | if (*j == '+') | |
1410 | j++; | |
1411 | if (path_equal(j, path)) | |
1412 | return true; | |
1413 | } | |
1414 | ||
1415 | return false; | |
1416 | } |