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Commit | Line | Data |
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53e1b683 | 1 | /* SPDX-License-Identifier: LGPL-2.1+ */ |
9eb977db | 2 | |
9eb977db | 3 | #include <errno.h> |
11c3a366 | 4 | #include <limits.h> |
07630cea LP |
5 | #include <stdio.h> |
6 | #include <stdlib.h> | |
11c3a366 | 7 | #include <sys/stat.h> |
07630cea | 8 | #include <unistd.h> |
9eb977db | 9 | |
5f311f8c LP |
10 | /* When we include libgen.h because we need dirname() we immediately |
11 | * undefine basename() since libgen.h defines it as a macro to the | |
12 | * POSIX version which is really broken. We prefer GNU basename(). */ | |
13 | #include <libgen.h> | |
14 | #undef basename | |
15 | ||
b5efdb8a | 16 | #include "alloc-util.h" |
93cc7779 | 17 | #include "extract-word.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 KS |
30 | |
31 | bool path_is_absolute(const char *p) { | |
32 | return p[0] == '/'; | |
33 | } | |
34 | ||
35 | bool is_path(const char *p) { | |
36 | return !!strchr(p, '/'); | |
37 | } | |
38 | ||
0f474365 | 39 | int path_split_and_make_absolute(const char *p, char ***ret) { |
9eb977db | 40 | char **l; |
0f474365 LP |
41 | int r; |
42 | ||
9eb977db | 43 | assert(p); |
0f474365 | 44 | assert(ret); |
9eb977db | 45 | |
116cc028 ZJS |
46 | l = strv_split(p, ":"); |
47 | if (!l) | |
ce9d6bcf | 48 | return -ENOMEM; |
9eb977db | 49 | |
0f474365 LP |
50 | r = path_strv_make_absolute_cwd(l); |
51 | if (r < 0) { | |
9eb977db | 52 | strv_free(l); |
0f474365 | 53 | return r; |
9eb977db KS |
54 | } |
55 | ||
0f474365 LP |
56 | *ret = l; |
57 | return r; | |
9eb977db KS |
58 | } |
59 | ||
60 | char *path_make_absolute(const char *p, const char *prefix) { | |
61 | assert(p); | |
62 | ||
63 | /* Makes every item in the list an absolute path by prepending | |
64 | * the prefix, if specified and necessary */ | |
65 | ||
81cce8de | 66 | if (path_is_absolute(p) || isempty(prefix)) |
9eb977db KS |
67 | return strdup(p); |
68 | ||
657ee2d8 | 69 | return path_join(prefix, p); |
9eb977db KS |
70 | } |
71 | ||
a2556d25 LP |
72 | int safe_getcwd(char **ret) { |
73 | char *cwd; | |
74 | ||
75 | cwd = get_current_dir_name(); | |
76 | if (!cwd) | |
77 | return negative_errno(); | |
78 | ||
79 | /* Let's make sure the directory is really absolute, to protect us from the logic behind | |
80 | * CVE-2018-1000001 */ | |
81 | if (cwd[0] != '/') { | |
82 | free(cwd); | |
83 | return -ENOMEDIUM; | |
84 | } | |
85 | ||
86 | *ret = cwd; | |
87 | return 0; | |
88 | } | |
89 | ||
0f474365 LP |
90 | int path_make_absolute_cwd(const char *p, char **ret) { |
91 | char *c; | |
d7249575 | 92 | int r; |
9eb977db KS |
93 | |
94 | assert(p); | |
0f474365 | 95 | assert(ret); |
9eb977db KS |
96 | |
97 | /* Similar to path_make_absolute(), but prefixes with the | |
98 | * current working directory. */ | |
99 | ||
100 | if (path_is_absolute(p)) | |
0f474365 LP |
101 | c = strdup(p); |
102 | else { | |
103 | _cleanup_free_ char *cwd = NULL; | |
9eb977db | 104 | |
d7249575 LP |
105 | r = safe_getcwd(&cwd); |
106 | if (r < 0) | |
107 | return r; | |
0f474365 | 108 | |
62a85ee0 | 109 | c = path_join(cwd, p); |
0f474365 LP |
110 | } |
111 | if (!c) | |
112 | return -ENOMEM; | |
9eb977db | 113 | |
0f474365 LP |
114 | *ret = c; |
115 | return 0; | |
9eb977db KS |
116 | } |
117 | ||
7cb9c51c | 118 | int path_make_relative(const char *from_dir, const char *to_path, char **_r) { |
48054262 YW |
119 | char *f, *t, *r, *p; |
120 | unsigned n_parents = 0; | |
7cb9c51c TK |
121 | |
122 | assert(from_dir); | |
123 | assert(to_path); | |
124 | assert(_r); | |
125 | ||
126 | /* Strips the common part, and adds ".." elements as necessary. */ | |
127 | ||
48054262 | 128 | if (!path_is_absolute(from_dir) || !path_is_absolute(to_path)) |
7cb9c51c TK |
129 | return -EINVAL; |
130 | ||
48054262 YW |
131 | f = strdupa(from_dir); |
132 | t = strdupa(to_path); | |
133 | ||
134 | path_simplify(f, true); | |
135 | path_simplify(t, true); | |
7cb9c51c TK |
136 | |
137 | /* Skip the common part. */ | |
138 | for (;;) { | |
2a5beb66 | 139 | size_t a, b; |
7cb9c51c | 140 | |
48054262 YW |
141 | f += *f == '/'; |
142 | t += *t == '/'; | |
7cb9c51c | 143 | |
48054262 YW |
144 | if (!*f) { |
145 | if (!*t) | |
7cb9c51c TK |
146 | /* from_dir equals to_path. */ |
147 | r = strdup("."); | |
148 | else | |
149 | /* from_dir is a parent directory of to_path. */ | |
48054262 | 150 | r = strdup(t); |
7cb9c51c TK |
151 | if (!r) |
152 | return -ENOMEM; | |
153 | ||
154 | *_r = r; | |
155 | return 0; | |
156 | } | |
157 | ||
48054262 | 158 | if (!*t) |
7cb9c51c TK |
159 | break; |
160 | ||
48054262 YW |
161 | a = strcspn(f, "/"); |
162 | b = strcspn(t, "/"); | |
7cb9c51c | 163 | |
48054262 | 164 | if (a != b || memcmp(f, t, a) != 0) |
7cb9c51c TK |
165 | break; |
166 | ||
48054262 YW |
167 | f += a; |
168 | t += b; | |
7cb9c51c TK |
169 | } |
170 | ||
171 | /* If we're here, then "from_dir" has one or more elements that need to | |
172 | * be replaced with "..". */ | |
173 | ||
174 | /* Count the number of necessary ".." elements. */ | |
48054262 | 175 | for (; *f;) { |
2a5beb66 LP |
176 | size_t w; |
177 | ||
48054262 | 178 | w = strcspn(f, "/"); |
2a5beb66 LP |
179 | |
180 | /* If this includes ".." we can't do a simple series of "..", refuse */ | |
48054262 | 181 | if (w == 2 && f[0] == '.' && f[1] == '.') |
2a5beb66 LP |
182 | return -EINVAL; |
183 | ||
48054262 YW |
184 | /* Count number of elements */ |
185 | n_parents++; | |
2a5beb66 | 186 | |
48054262 YW |
187 | f += w; |
188 | f += *f == '/'; | |
7cb9c51c TK |
189 | } |
190 | ||
48054262 | 191 | r = new(char, n_parents * 3 + strlen(t) + 1); |
7cb9c51c TK |
192 | if (!r) |
193 | return -ENOMEM; | |
194 | ||
2a5beb66 LP |
195 | for (p = r; n_parents > 0; n_parents--) |
196 | p = mempcpy(p, "../", 3); | |
7cb9c51c | 197 | |
48054262 YW |
198 | if (*t) |
199 | strcpy(p, t); | |
200 | else | |
201 | /* Remove trailing slash */ | |
202 | *(--p) = 0; | |
7cb9c51c TK |
203 | |
204 | *_r = r; | |
205 | return 0; | |
206 | } | |
207 | ||
cc4d7d81 ZJS |
208 | char* path_startswith_strv(const char *p, char **set) { |
209 | char **s, *t; | |
210 | ||
211 | STRV_FOREACH(s, set) { | |
212 | t = path_startswith(p, *s); | |
213 | if (t) | |
214 | return t; | |
215 | } | |
216 | ||
217 | return NULL; | |
218 | } | |
219 | ||
0f474365 | 220 | int path_strv_make_absolute_cwd(char **l) { |
9eb977db | 221 | char **s; |
0f474365 | 222 | int r; |
9eb977db KS |
223 | |
224 | /* Goes through every item in the string list and makes it | |
225 | * absolute. This works in place and won't rollback any | |
226 | * changes on failure. */ | |
227 | ||
228 | STRV_FOREACH(s, l) { | |
229 | char *t; | |
230 | ||
0f474365 LP |
231 | r = path_make_absolute_cwd(*s, &t); |
232 | if (r < 0) | |
233 | return r; | |
9eb977db | 234 | |
858d36c1 | 235 | path_simplify(t, false); |
32a8f700 | 236 | free_and_replace(*s, t); |
9eb977db KS |
237 | } |
238 | ||
0f474365 | 239 | return 0; |
9eb977db KS |
240 | } |
241 | ||
e1873695 | 242 | char **path_strv_resolve(char **l, const char *root) { |
9eb977db KS |
243 | char **s; |
244 | unsigned k = 0; | |
245 | bool enomem = false; | |
e1873695 | 246 | int r; |
9eb977db KS |
247 | |
248 | if (strv_isempty(l)) | |
249 | return l; | |
250 | ||
251 | /* Goes through every item in the string list and canonicalize | |
252 | * the path. This works in place and won't rollback any | |
253 | * changes on failure. */ | |
254 | ||
255 | STRV_FOREACH(s, l) { | |
12ed81d9 | 256 | _cleanup_free_ char *orig = NULL; |
e1873695 | 257 | char *t, *u; |
9eb977db | 258 | |
12ed81d9 ZJS |
259 | if (!path_is_absolute(*s)) { |
260 | free(*s); | |
9eb977db | 261 | continue; |
12ed81d9 | 262 | } |
112cfb18 | 263 | |
e1873695 | 264 | if (root) { |
12ed81d9 | 265 | orig = *s; |
c6134d3e | 266 | t = path_join(root, orig); |
112cfb18 MM |
267 | if (!t) { |
268 | enomem = true; | |
269 | continue; | |
270 | } | |
12ed81d9 | 271 | } else |
112cfb18 | 272 | t = *s; |
9eb977db | 273 | |
a5648b80 | 274 | r = chase_symlinks(t, root, 0, &u, NULL); |
e1873695 LP |
275 | if (r == -ENOENT) { |
276 | if (root) { | |
ae2a15bc | 277 | u = TAKE_PTR(orig); |
874310b7 | 278 | free(t); |
e1873695 LP |
279 | } else |
280 | u = t; | |
281 | } else if (r < 0) { | |
282 | free(t); | |
874310b7 | 283 | |
e1873695 LP |
284 | if (r == -ENOMEM) |
285 | enomem = true; | |
286 | ||
287 | continue; | |
288 | } else if (root) { | |
12ed81d9 ZJS |
289 | char *x; |
290 | ||
291 | free(t); | |
e1873695 | 292 | x = path_startswith(u, root); |
12ed81d9 ZJS |
293 | if (x) { |
294 | /* restore the slash if it was lost */ | |
295 | if (!startswith(x, "/")) | |
296 | *(--x) = '/'; | |
297 | ||
298 | t = strdup(x); | |
299 | free(u); | |
300 | if (!t) { | |
301 | enomem = true; | |
302 | continue; | |
303 | } | |
304 | u = t; | |
305 | } else { | |
306 | /* canonicalized path goes outside of | |
307 | * prefix, keep the original path instead */ | |
3b319885 | 308 | free_and_replace(u, orig); |
12ed81d9 | 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 | ||
e1873695 | 324 | char **path_strv_resolve_uniq(char **l, const char *root) { |
112cfb18 | 325 | |
fabe5c0e LP |
326 | if (strv_isempty(l)) |
327 | return l; | |
328 | ||
e1873695 | 329 | if (!path_strv_resolve(l, root)) |
fabe5c0e LP |
330 | return NULL; |
331 | ||
332 | return strv_uniq(l); | |
333 | } | |
334 | ||
858d36c1 | 335 | char *path_simplify(char *path, bool kill_dots) { |
9eb977db | 336 | char *f, *t; |
858d36c1 | 337 | bool slash = false, ignore_slash = false, absolute; |
9eb977db | 338 | |
858d36c1 YW |
339 | assert(path); |
340 | ||
341 | /* Removes redundant inner and trailing slashes. Also removes unnecessary dots | |
342 | * if kill_dots is true. Modifies the passed string in-place. | |
9eb977db | 343 | * |
afbae3e9 TH |
344 | * ///foo//./bar/. becomes /foo/./bar/. (if kill_dots is false) |
345 | * ///foo//./bar/. becomes /foo/bar (if kill_dots is true) | |
346 | * .//./foo//./bar/. becomes ././foo/./bar/. (if kill_dots is false) | |
347 | * .//./foo//./bar/. becomes foo/bar (if kill_dots is true) | |
9eb977db KS |
348 | */ |
349 | ||
afbae3e9 TH |
350 | if (isempty(path)) |
351 | return path; | |
352 | ||
858d36c1 YW |
353 | absolute = path_is_absolute(path); |
354 | ||
355 | f = path; | |
356 | if (kill_dots && *f == '.' && IN_SET(f[1], 0, '/')) { | |
357 | ignore_slash = true; | |
358 | f++; | |
359 | } | |
360 | ||
361 | for (t = path; *f; f++) { | |
9eb977db KS |
362 | |
363 | if (*f == '/') { | |
364 | slash = true; | |
365 | continue; | |
366 | } | |
367 | ||
368 | if (slash) { | |
858d36c1 YW |
369 | if (kill_dots && *f == '.' && IN_SET(f[1], 0, '/')) |
370 | continue; | |
371 | ||
9eb977db | 372 | slash = false; |
858d36c1 YW |
373 | if (ignore_slash) |
374 | ignore_slash = false; | |
375 | else | |
376 | *(t++) = '/'; | |
9eb977db KS |
377 | } |
378 | ||
379 | *(t++) = *f; | |
380 | } | |
381 | ||
afbae3e9 TH |
382 | /* Special rule, if we stripped everything, we either need a "/" (for the root directory) |
383 | * or "." for the current directory */ | |
384 | if (t == path) { | |
385 | if (absolute) | |
386 | *(t++) = '/'; | |
387 | else | |
388 | *(t++) = '.'; | |
389 | } | |
9eb977db KS |
390 | |
391 | *t = 0; | |
392 | return path; | |
393 | } | |
394 | ||
b47aa73a ZJS |
395 | int path_simplify_and_warn( |
396 | char *path, | |
397 | unsigned flag, | |
398 | const char *unit, | |
399 | const char *filename, | |
400 | unsigned line, | |
401 | const char *lvalue) { | |
402 | ||
403 | bool fatal = flag & PATH_CHECK_FATAL; | |
404 | ||
405 | assert(!FLAGS_SET(flag, PATH_CHECK_ABSOLUTE | PATH_CHECK_RELATIVE)); | |
406 | ||
407 | if (!utf8_is_valid(path)) | |
408 | return log_syntax_invalid_utf8(unit, LOG_ERR, filename, line, path); | |
409 | ||
410 | if (flag & (PATH_CHECK_ABSOLUTE | PATH_CHECK_RELATIVE)) { | |
411 | bool absolute; | |
412 | ||
413 | absolute = path_is_absolute(path); | |
414 | ||
415 | if (!absolute && (flag & PATH_CHECK_ABSOLUTE)) | |
416 | return log_syntax(unit, LOG_ERR, filename, line, SYNTHETIC_ERRNO(EINVAL), | |
417 | "%s= path is not absolute%s: %s", | |
418 | lvalue, fatal ? "" : ", ignoring", path); | |
419 | ||
420 | if (absolute && (flag & PATH_CHECK_RELATIVE)) | |
421 | return log_syntax(unit, LOG_ERR, filename, line, SYNTHETIC_ERRNO(EINVAL), | |
422 | "%s= path is absolute%s: %s", | |
423 | lvalue, fatal ? "" : ", ignoring", path); | |
424 | } | |
425 | ||
426 | path_simplify(path, true); | |
427 | ||
428 | if (!path_is_valid(path)) | |
429 | return log_syntax(unit, LOG_ERR, filename, line, SYNTHETIC_ERRNO(EINVAL), | |
430 | "%s= path has invalid length (%zu bytes)%s.", | |
431 | lvalue, strlen(path), fatal ? "" : ", ignoring"); | |
432 | ||
433 | if (!path_is_normalized(path)) | |
434 | return log_syntax(unit, LOG_ERR, filename, line, SYNTHETIC_ERRNO(EINVAL), | |
435 | "%s= path is not normalized%s: %s", | |
436 | lvalue, fatal ? "" : ", ignoring", path); | |
437 | ||
438 | return 0; | |
439 | } | |
440 | ||
424a19f8 | 441 | char* path_startswith(const char *path, const char *prefix) { |
9eb977db KS |
442 | assert(path); |
443 | assert(prefix); | |
444 | ||
0470289b ZJS |
445 | /* Returns a pointer to the start of the first component after the parts matched by |
446 | * the prefix, iff | |
447 | * - both paths are absolute or both paths are relative, | |
448 | * and | |
449 | * - each component in prefix in turn matches a component in path at the same position. | |
450 | * An empty string will be returned when the prefix and path are equivalent. | |
451 | * | |
452 | * Returns NULL otherwise. | |
453 | */ | |
454 | ||
9eb977db | 455 | if ((path[0] == '/') != (prefix[0] == '/')) |
424a19f8 | 456 | return NULL; |
9eb977db KS |
457 | |
458 | for (;;) { | |
459 | size_t a, b; | |
460 | ||
461 | path += strspn(path, "/"); | |
462 | prefix += strspn(prefix, "/"); | |
463 | ||
464 | if (*prefix == 0) | |
424a19f8 | 465 | return (char*) path; |
9eb977db KS |
466 | |
467 | if (*path == 0) | |
424a19f8 | 468 | return NULL; |
9eb977db KS |
469 | |
470 | a = strcspn(path, "/"); | |
471 | b = strcspn(prefix, "/"); | |
472 | ||
473 | if (a != b) | |
424a19f8 | 474 | return NULL; |
9eb977db KS |
475 | |
476 | if (memcmp(path, prefix, a) != 0) | |
424a19f8 | 477 | return NULL; |
9eb977db KS |
478 | |
479 | path += a; | |
480 | prefix += b; | |
481 | } | |
482 | } | |
483 | ||
2230852b MS |
484 | int path_compare(const char *a, const char *b) { |
485 | int d; | |
486 | ||
9eb977db KS |
487 | assert(a); |
488 | assert(b); | |
489 | ||
f21f31b2 | 490 | /* A relative path and an absolute path must not compare as equal. |
2230852b MS |
491 | * Which one is sorted before the other does not really matter. |
492 | * Here a relative path is ordered before an absolute path. */ | |
493 | d = (a[0] == '/') - (b[0] == '/'); | |
373cd63a | 494 | if (d != 0) |
2230852b | 495 | return d; |
9eb977db KS |
496 | |
497 | for (;;) { | |
498 | size_t j, k; | |
499 | ||
500 | a += strspn(a, "/"); | |
501 | b += strspn(b, "/"); | |
502 | ||
503 | if (*a == 0 && *b == 0) | |
2230852b | 504 | return 0; |
9eb977db | 505 | |
2230852b MS |
506 | /* Order prefixes first: "/foo" before "/foo/bar" */ |
507 | if (*a == 0) | |
508 | return -1; | |
509 | if (*b == 0) | |
510 | return 1; | |
9eb977db KS |
511 | |
512 | j = strcspn(a, "/"); | |
513 | k = strcspn(b, "/"); | |
514 | ||
2230852b MS |
515 | /* Alphabetical sort: "/foo/aaa" before "/foo/b" */ |
516 | d = memcmp(a, b, MIN(j, k)); | |
373cd63a | 517 | if (d != 0) |
2230852b | 518 | return (d > 0) - (d < 0); /* sign of d */ |
9eb977db | 519 | |
2230852b MS |
520 | /* Sort "/foo/a" before "/foo/aaa" */ |
521 | d = (j > k) - (j < k); /* sign of (j - k) */ | |
373cd63a | 522 | if (d != 0) |
2230852b | 523 | return d; |
9eb977db KS |
524 | |
525 | a += j; | |
526 | b += k; | |
527 | } | |
528 | } | |
529 | ||
2230852b MS |
530 | bool path_equal(const char *a, const char *b) { |
531 | return path_compare(a, b) == 0; | |
532 | } | |
533 | ||
e3f791a2 ZJS |
534 | bool path_equal_or_files_same(const char *a, const char *b, int flags) { |
535 | return path_equal(a, b) || files_same(a, b, flags) > 0; | |
c78e47a6 MS |
536 | } |
537 | ||
62a85ee0 | 538 | char* path_join_internal(const char *first, ...) { |
cd8194a3 LP |
539 | char *joined, *q; |
540 | const char *p; | |
541 | va_list ap; | |
542 | bool slash; | |
543 | size_t sz; | |
544 | ||
652ef298 ZJS |
545 | /* Joins all listed strings until the sentinel and places a "/" between them unless the strings end/begin |
546 | * already with one so that it is unnecessary. Note that slashes which are already duplicate won't be | |
547 | * removed. The string returned is hence always equal to or longer than the sum of the lengths of each | |
548 | * individual string. | |
cd8194a3 LP |
549 | * |
550 | * Note: any listed empty string is simply skipped. This can be useful for concatenating strings of which some | |
551 | * are optional. | |
552 | * | |
553 | * Examples: | |
554 | * | |
62a85ee0 ZJS |
555 | * path_join("foo", "bar") → "foo/bar" |
556 | * path_join("foo/", "bar") → "foo/bar" | |
557 | * path_join("", "foo", "", "bar", "") → "foo/bar" */ | |
cd8194a3 | 558 | |
652ef298 | 559 | sz = strlen_ptr(first); |
cd8194a3 | 560 | va_start(ap, first); |
652ef298 ZJS |
561 | while ((p = va_arg(ap, char*)) != (const char*) -1) |
562 | if (!isempty(p)) | |
563 | sz += 1 + strlen(p); | |
cd8194a3 LP |
564 | va_end(ap); |
565 | ||
566 | joined = new(char, sz + 1); | |
567 | if (!joined) | |
568 | return NULL; | |
569 | ||
652ef298 | 570 | if (!isempty(first)) { |
cd8194a3 LP |
571 | q = stpcpy(joined, first); |
572 | slash = endswith(first, "/"); | |
573 | } else { | |
574 | /* Skip empty items */ | |
575 | joined[0] = 0; | |
576 | q = joined; | |
577 | slash = true; /* no need to generate a slash anymore */ | |
578 | } | |
579 | ||
580 | va_start(ap, first); | |
652ef298 ZJS |
581 | while ((p = va_arg(ap, char*)) != (const char*) -1) { |
582 | if (isempty(p)) | |
cd8194a3 LP |
583 | continue; |
584 | ||
585 | if (!slash && p[0] != '/') | |
586 | *(q++) = '/'; | |
587 | ||
588 | q = stpcpy(q, p); | |
589 | slash = endswith(p, "/"); | |
590 | } | |
591 | va_end(ap); | |
592 | ||
593 | return joined; | |
594 | } | |
595 | ||
85eca92e LP |
596 | int find_binary(const char *name, char **ret) { |
597 | int last_error, r; | |
598 | const char *p; | |
599 | ||
c9d954b2 | 600 | assert(name); |
4087cb9e | 601 | |
571d0134 | 602 | if (is_path(name)) { |
85eca92e | 603 | if (access(name, X_OK) < 0) |
b972115c ZJS |
604 | return -errno; |
605 | ||
85eca92e | 606 | if (ret) { |
0f474365 LP |
607 | r = path_make_absolute_cwd(name, ret); |
608 | if (r < 0) | |
609 | return r; | |
eb66db55 | 610 | } |
c9d954b2 | 611 | |
c9d954b2 | 612 | return 0; |
85eca92e | 613 | } |
c9d954b2 | 614 | |
85eca92e LP |
615 | /** |
616 | * Plain getenv, not secure_getenv, because we want | |
617 | * to actually allow the user to pick the binary. | |
618 | */ | |
619 | p = getenv("PATH"); | |
620 | if (!p) | |
621 | p = DEFAULT_PATH; | |
622 | ||
623 | last_error = -ENOENT; | |
624 | ||
625 | for (;;) { | |
626 | _cleanup_free_ char *j = NULL, *element = NULL; | |
627 | ||
628 | r = extract_first_word(&p, &element, ":", EXTRACT_RELAX|EXTRACT_DONT_COALESCE_SEPARATORS); | |
629 | if (r < 0) | |
630 | return r; | |
631 | if (r == 0) | |
632 | break; | |
633 | ||
0f474365 LP |
634 | if (!path_is_absolute(element)) |
635 | continue; | |
636 | ||
657ee2d8 | 637 | j = path_join(element, name); |
85eca92e LP |
638 | if (!j) |
639 | return -ENOMEM; | |
640 | ||
641 | if (access(j, X_OK) >= 0) { | |
642 | /* Found it! */ | |
c9d954b2 | 643 | |
85eca92e | 644 | if (ret) { |
858d36c1 | 645 | *ret = path_simplify(j, false); |
85eca92e | 646 | j = NULL; |
eb66db55 | 647 | } |
c9d954b2 ZJS |
648 | |
649 | return 0; | |
650 | } | |
651 | ||
4e1ddb66 CD |
652 | /* PATH entries which we don't have access to are ignored, as per tradition. */ |
653 | if (errno != EACCES) | |
654 | last_error = -errno; | |
c9d954b2 | 655 | } |
85eca92e LP |
656 | |
657 | return last_error; | |
c9d954b2 | 658 | } |
8e184852 | 659 | |
2ad8416d | 660 | bool paths_check_timestamp(const char* const* paths, usec_t *timestamp, bool update) { |
8e184852 | 661 | bool changed = false; |
2ad8416d | 662 | const char* const* i; |
8e184852 | 663 | |
97f2d76d TG |
664 | assert(timestamp); |
665 | ||
234519ae | 666 | if (!paths) |
4087cb9e | 667 | return false; |
8e184852 | 668 | |
4087cb9e | 669 | STRV_FOREACH(i, paths) { |
8e184852 | 670 | struct stat stats; |
4087cb9e | 671 | usec_t u; |
8e184852 | 672 | |
4087cb9e | 673 | if (stat(*i, &stats) < 0) |
8e184852 TG |
674 | continue; |
675 | ||
4087cb9e LP |
676 | u = timespec_load(&stats.st_mtim); |
677 | ||
97f2d76d | 678 | /* first check */ |
4087cb9e | 679 | if (*timestamp >= u) |
8e184852 TG |
680 | continue; |
681 | ||
9f6445e3 | 682 | log_debug("timestamp of '%s' changed", *i); |
8e184852 TG |
683 | |
684 | /* update timestamp */ | |
4087cb9e LP |
685 | if (update) { |
686 | *timestamp = u; | |
687 | changed = true; | |
688 | } else | |
689 | return true; | |
8e184852 | 690 | } |
4087cb9e | 691 | |
8e184852 TG |
692 | return changed; |
693 | } | |
eb66db55 | 694 | |
5bcd08db | 695 | static int binary_is_good(const char *binary) { |
571d0134 | 696 | _cleanup_free_ char *p = NULL, *d = NULL; |
571d0134 | 697 | int r; |
eb66db55 | 698 | |
85eca92e LP |
699 | r = find_binary(binary, &p); |
700 | if (r == -ENOENT) | |
701 | return 0; | |
571d0134 LP |
702 | if (r < 0) |
703 | return r; | |
704 | ||
061df014 | 705 | /* An fsck that is linked to /bin/true is a non-existent |
571d0134 LP |
706 | * fsck */ |
707 | ||
708 | r = readlink_malloc(p, &d); | |
85eca92e LP |
709 | if (r == -EINVAL) /* not a symlink */ |
710 | return 1; | |
711 | if (r < 0) | |
712 | return r; | |
571d0134 | 713 | |
3ae5990c ZJS |
714 | return !PATH_IN_SET(d, "true" |
715 | "/bin/true", | |
716 | "/usr/bin/true", | |
717 | "/dev/null"); | |
eb66db55 | 718 | } |
1d13f648 | 719 | |
5bcd08db LP |
720 | int fsck_exists(const char *fstype) { |
721 | const char *checker; | |
722 | ||
85eca92e | 723 | assert(fstype); |
5bcd08db | 724 | |
85eca92e LP |
725 | if (streq(fstype, "auto")) |
726 | return -EINVAL; | |
727 | ||
728 | checker = strjoina("fsck.", fstype); | |
5bcd08db LP |
729 | return binary_is_good(checker); |
730 | } | |
731 | ||
732 | int mkfs_exists(const char *fstype) { | |
733 | const char *mkfs; | |
734 | ||
85eca92e | 735 | assert(fstype); |
5bcd08db | 736 | |
85eca92e LP |
737 | if (streq(fstype, "auto")) |
738 | return -EINVAL; | |
739 | ||
740 | mkfs = strjoina("mkfs.", fstype); | |
5bcd08db LP |
741 | return binary_is_good(mkfs); |
742 | } | |
743 | ||
0f03c2a4 LP |
744 | int parse_path_argument_and_warn(const char *path, bool suppress_root, char **arg) { |
745 | char *p; | |
746 | int r; | |
747 | ||
748 | /* | |
749 | * This function is intended to be used in command line | |
750 | * parsers, to handle paths that are passed in. It makes the | |
751 | * path absolute, and reduces it to NULL if omitted or | |
752 | * root (the latter optionally). | |
753 | * | |
754 | * NOTE THAT THIS WILL FREE THE PREVIOUS ARGUMENT POINTER ON | |
755 | * SUCCESS! Hence, do not pass in uninitialized pointers. | |
756 | */ | |
757 | ||
758 | if (isempty(path)) { | |
759 | *arg = mfree(*arg); | |
760 | return 0; | |
761 | } | |
762 | ||
763 | r = path_make_absolute_cwd(path, &p); | |
764 | if (r < 0) | |
765 | return log_error_errno(r, "Failed to parse path \"%s\" and make it absolute: %m", path); | |
766 | ||
858d36c1 | 767 | path_simplify(p, false); |
53e87b5a | 768 | if (suppress_root && empty_or_root(p)) |
0f03c2a4 LP |
769 | p = mfree(p); |
770 | ||
858d36c1 | 771 | free_and_replace(*arg, p); |
53e87b5a | 772 | |
0f03c2a4 LP |
773 | return 0; |
774 | } | |
5f311f8c LP |
775 | |
776 | char* dirname_malloc(const char *path) { | |
777 | char *d, *dir, *dir2; | |
778 | ||
779 | assert(path); | |
780 | ||
781 | d = strdup(path); | |
782 | if (!d) | |
783 | return NULL; | |
784 | ||
785 | dir = dirname(d); | |
786 | assert(dir); | |
787 | ||
788 | if (dir == d) | |
789 | return d; | |
790 | ||
791 | dir2 = strdup(dir); | |
792 | free(d); | |
793 | ||
794 | return dir2; | |
795 | } | |
bb15fafe | 796 | |
b12d25a8 | 797 | const char *last_path_component(const char *path) { |
8460289f LP |
798 | |
799 | /* Finds the last component of the path, preserving the optional trailing slash that signifies a directory. | |
800 | * | |
b12d25a8 ZJS |
801 | * a/b/c → c |
802 | * a/b/c/ → c/ | |
8460289f LP |
803 | * x → x |
804 | * x/ → x/ | |
805 | * /y → y | |
806 | * /y/ → y/ | |
b12d25a8 ZJS |
807 | * / → / |
808 | * // → / | |
809 | * /foo/a → a | |
810 | * /foo/a/ → a/ | |
8460289f LP |
811 | * |
812 | * Also, the empty string is mapped to itself. | |
813 | * | |
814 | * This is different than basename(), which returns "" when a trailing slash is present. | |
b12d25a8 ZJS |
815 | */ |
816 | ||
817 | unsigned l, k; | |
818 | ||
77e0a1b5 LP |
819 | if (!path) |
820 | return NULL; | |
821 | ||
b12d25a8 | 822 | l = k = strlen(path); |
69f9ccf1 ZJS |
823 | if (l == 0) /* special case — an empty string */ |
824 | return path; | |
825 | ||
b12d25a8 ZJS |
826 | while (k > 0 && path[k-1] == '/') |
827 | k--; | |
828 | ||
829 | if (k == 0) /* the root directory */ | |
830 | return path + l - 1; | |
831 | ||
832 | while (k > 0 && path[k-1] != '/') | |
833 | k--; | |
834 | ||
835 | return path + k; | |
836 | } | |
837 | ||
a60c8eee LP |
838 | int path_extract_filename(const char *p, char **ret) { |
839 | _cleanup_free_ char *a = NULL; | |
840 | const char *c, *e = NULL, *q; | |
841 | ||
842 | /* Extracts the filename part (i.e. right-most component) from a path, i.e. string that passes | |
843 | * filename_is_valid(). A wrapper around last_path_component(), but eats up trailing slashes. */ | |
844 | ||
845 | if (!p) | |
846 | return -EINVAL; | |
847 | ||
848 | c = last_path_component(p); | |
849 | ||
850 | for (q = c; *q != 0; q++) | |
851 | if (*q != '/') | |
852 | e = q + 1; | |
853 | ||
854 | if (!e) /* no valid character? */ | |
855 | return -EINVAL; | |
856 | ||
857 | a = strndup(c, e - c); | |
858 | if (!a) | |
859 | return -ENOMEM; | |
860 | ||
861 | if (!filename_is_valid(a)) | |
862 | return -EINVAL; | |
863 | ||
864 | *ret = TAKE_PTR(a); | |
865 | ||
866 | return 0; | |
867 | } | |
868 | ||
bb15fafe LP |
869 | bool filename_is_valid(const char *p) { |
870 | const char *e; | |
871 | ||
872 | if (isempty(p)) | |
873 | return false; | |
874 | ||
49bfc877 | 875 | if (dot_or_dot_dot(p)) |
bb15fafe LP |
876 | return false; |
877 | ||
878 | e = strchrnul(p, '/'); | |
879 | if (*e != 0) | |
880 | return false; | |
881 | ||
656552eb | 882 | if (e - p > FILENAME_MAX) /* FILENAME_MAX is counted *without* the trailing NUL byte */ |
bb15fafe LP |
883 | return false; |
884 | ||
885 | return true; | |
886 | } | |
887 | ||
656552eb | 888 | bool path_is_valid(const char *p) { |
bb15fafe LP |
889 | |
890 | if (isempty(p)) | |
891 | return false; | |
892 | ||
656552eb | 893 | if (strlen(p) >= PATH_MAX) /* PATH_MAX is counted *with* the trailing NUL byte */ |
49bfc877 LP |
894 | return false; |
895 | ||
656552eb LP |
896 | return true; |
897 | } | |
898 | ||
899 | bool path_is_normalized(const char *p) { | |
900 | ||
901 | if (!path_is_valid(p)) | |
902 | return false; | |
903 | ||
904 | if (dot_or_dot_dot(p)) | |
bb15fafe LP |
905 | return false; |
906 | ||
656552eb | 907 | if (startswith(p, "../") || endswith(p, "/..") || strstr(p, "/../")) |
bb15fafe LP |
908 | return false; |
909 | ||
49bfc877 | 910 | if (startswith(p, "./") || endswith(p, "/.") || strstr(p, "/./")) |
bb15fafe LP |
911 | return false; |
912 | ||
913 | if (strstr(p, "//")) | |
914 | return false; | |
915 | ||
916 | return true; | |
917 | } | |
a0956174 LP |
918 | |
919 | char *file_in_same_dir(const char *path, const char *filename) { | |
920 | char *e, *ret; | |
921 | size_t k; | |
922 | ||
923 | assert(path); | |
924 | assert(filename); | |
925 | ||
926 | /* This removes the last component of path and appends | |
927 | * filename, unless the latter is absolute anyway or the | |
928 | * former isn't */ | |
929 | ||
930 | if (path_is_absolute(filename)) | |
931 | return strdup(filename); | |
932 | ||
933 | e = strrchr(path, '/'); | |
934 | if (!e) | |
935 | return strdup(filename); | |
936 | ||
937 | k = strlen(filename); | |
938 | ret = new(char, (e + 1 - path) + k + 1); | |
939 | if (!ret) | |
940 | return NULL; | |
941 | ||
942 | memcpy(mempcpy(ret, path, e + 1 - path), filename, k + 1); | |
943 | return ret; | |
944 | } | |
945 | ||
55cdd057 ZJS |
946 | bool hidden_or_backup_file(const char *filename) { |
947 | const char *p; | |
a0956174 | 948 | |
a0956174 LP |
949 | assert(filename); |
950 | ||
55cdd057 ZJS |
951 | if (filename[0] == '.' || |
952 | streq(filename, "lost+found") || | |
953 | streq(filename, "aquota.user") || | |
954 | streq(filename, "aquota.group") || | |
955 | endswith(filename, "~")) | |
a0956174 LP |
956 | return true; |
957 | ||
55cdd057 ZJS |
958 | p = strrchr(filename, '.'); |
959 | if (!p) | |
960 | return false; | |
961 | ||
941060bf LP |
962 | /* Please, let's not add more entries to the list below. If external projects think it's a good idea to come up |
963 | * with always new suffixes and that everybody else should just adjust to that, then it really should be on | |
964 | * them. Hence, in future, let's not add any more entries. Instead, let's ask those packages to instead adopt | |
965 | * one of the generic suffixes/prefixes for hidden files or backups, possibly augmented with an additional | |
966 | * string. Specifically: there's now: | |
967 | * | |
968 | * The generic suffixes "~" and ".bak" for backup files | |
969 | * The generic prefix "." for hidden files | |
970 | * | |
94a0ef6e ZJS |
971 | * Thus, if a new package manager "foopkg" wants its own set of ".foopkg-new", ".foopkg-old", ".foopkg-dist" |
972 | * or so registered, let's refuse that and ask them to use ".foopkg.new", ".foopkg.old" or ".foopkg~" instead. | |
941060bf LP |
973 | */ |
974 | ||
55cdd057 ZJS |
975 | return STR_IN_SET(p + 1, |
976 | "rpmnew", | |
977 | "rpmsave", | |
978 | "rpmorig", | |
979 | "dpkg-old", | |
980 | "dpkg-new", | |
981 | "dpkg-tmp", | |
982 | "dpkg-dist", | |
983 | "dpkg-bak", | |
984 | "dpkg-backup", | |
985 | "dpkg-remove", | |
986 | "ucf-new", | |
987 | "ucf-old", | |
988 | "ucf-dist", | |
941060bf | 989 | "swp", |
94a0ef6e ZJS |
990 | "bak", |
991 | "old", | |
992 | "new"); | |
a0956174 LP |
993 | } |
994 | ||
995 | bool is_device_path(const char *path) { | |
996 | ||
bae47ba7 | 997 | /* Returns true on paths that likely refer to a device, either by path in sysfs or to something in /dev */ |
a0956174 | 998 | |
bae47ba7 | 999 | return PATH_STARTSWITH_SET(path, "/dev/", "/sys/"); |
3ccb8862 ZJS |
1000 | } |
1001 | ||
57e84e75 LP |
1002 | bool valid_device_node_path(const char *path) { |
1003 | ||
1004 | /* Some superficial checks whether the specified path is a valid device node path, all without looking at the | |
1005 | * actual device node. */ | |
1006 | ||
1007 | if (!PATH_STARTSWITH_SET(path, "/dev/", "/run/systemd/inaccessible/")) | |
1008 | return false; | |
1009 | ||
1010 | if (endswith(path, "/")) /* can't be a device node if it ends in a slash */ | |
1011 | return false; | |
1012 | ||
1013 | return path_is_normalized(path); | |
1014 | } | |
1015 | ||
1016 | bool valid_device_allow_pattern(const char *path) { | |
1017 | assert(path); | |
1018 | ||
1019 | /* Like valid_device_node_path(), but also allows full-subsystem expressions, like DeviceAllow= and DeviceDeny= | |
1020 | * accept it */ | |
1021 | ||
49fe5c09 | 1022 | if (STARTSWITH_SET(path, "block-", "char-")) |
57e84e75 LP |
1023 | return true; |
1024 | ||
1025 | return valid_device_node_path(path); | |
a0956174 | 1026 | } |
5a46d55f ZJS |
1027 | |
1028 | int systemd_installation_has_version(const char *root, unsigned minimal_version) { | |
1029 | const char *pattern; | |
1030 | int r; | |
1031 | ||
1032 | /* Try to guess if systemd installation is later than the specified version. This | |
1033 | * is hacky and likely to yield false negatives, particularly if the installation | |
1034 | * is non-standard. False positives should be relatively rare. | |
1035 | */ | |
1036 | ||
1037 | NULSTR_FOREACH(pattern, | |
1038 | /* /lib works for systems without usr-merge, and for systems with a sane | |
1039 | * usr-merge, where /lib is a symlink to /usr/lib. /usr/lib is necessary | |
1040 | * for Gentoo which does a merge without making /lib a symlink. | |
1041 | */ | |
1042 | "lib/systemd/libsystemd-shared-*.so\0" | |
28faeda4 LP |
1043 | "lib64/systemd/libsystemd-shared-*.so\0" |
1044 | "usr/lib/systemd/libsystemd-shared-*.so\0" | |
1045 | "usr/lib64/systemd/libsystemd-shared-*.so\0") { | |
5a46d55f ZJS |
1046 | |
1047 | _cleanup_strv_free_ char **names = NULL; | |
1048 | _cleanup_free_ char *path = NULL; | |
1049 | char *c, **name; | |
1050 | ||
c6134d3e | 1051 | path = path_join(root, pattern); |
5a46d55f ZJS |
1052 | if (!path) |
1053 | return -ENOMEM; | |
1054 | ||
1055 | r = glob_extend(&names, path); | |
1056 | if (r == -ENOENT) | |
1057 | continue; | |
1058 | if (r < 0) | |
1059 | return r; | |
1060 | ||
dcd6361e | 1061 | assert_se(c = endswith(path, "*.so")); |
5a46d55f ZJS |
1062 | *c = '\0'; /* truncate the glob part */ |
1063 | ||
1064 | STRV_FOREACH(name, names) { | |
1065 | /* This is most likely to run only once, hence let's not optimize anything. */ | |
1066 | char *t, *t2; | |
1067 | unsigned version; | |
1068 | ||
1069 | t = startswith(*name, path); | |
1070 | if (!t) | |
1071 | continue; | |
1072 | ||
1073 | t2 = endswith(t, ".so"); | |
1074 | if (!t2) | |
1075 | continue; | |
1076 | ||
1077 | t2[0] = '\0'; /* truncate the suffix */ | |
1078 | ||
1079 | r = safe_atou(t, &version); | |
1080 | if (r < 0) { | |
1081 | log_debug_errno(r, "Found libsystemd shared at \"%s.so\", but failed to parse version: %m", *name); | |
1082 | continue; | |
1083 | } | |
1084 | ||
1085 | log_debug("Found libsystemd shared at \"%s.so\", version %u (%s).", | |
1086 | *name, version, | |
1087 | version >= minimal_version ? "OK" : "too old"); | |
1088 | if (version >= minimal_version) | |
1089 | return true; | |
1090 | } | |
1091 | } | |
1092 | ||
1093 | return false; | |
1094 | } | |
49bfc877 LP |
1095 | |
1096 | bool dot_or_dot_dot(const char *path) { | |
1097 | if (!path) | |
1098 | return false; | |
1099 | if (path[0] != '.') | |
1100 | return false; | |
1101 | if (path[1] == 0) | |
1102 | return true; | |
1103 | if (path[1] != '.') | |
1104 | return false; | |
1105 | ||
1106 | return path[2] == 0; | |
1107 | } | |
57ea45e1 LP |
1108 | |
1109 | bool empty_or_root(const char *root) { | |
1110 | ||
1111 | /* For operations relative to some root directory, returns true if the specified root directory is redundant, | |
1112 | * i.e. either / or NULL or the empty string or any equivalent. */ | |
1113 | ||
1114 | if (!root) | |
1115 | return true; | |
1116 | ||
1117 | return root[strspn(root, "/")] == 0; | |
1118 | } |