]>
Commit | Line | Data |
---|---|---|
69b7e41e KZ |
1 | /* |
2 | * Copyright (C) 2008-2009 Karel Zak <kzak@redhat.com> | |
3 | * | |
4 | * This file may be redistributed under the terms of the | |
5 | * GNU Lesser General Public License. | |
6 | */ | |
7 | ||
192c6aad KZ |
8 | /** |
9 | * SECTION: utils | |
10 | * @title: Utils | |
11 | * @short_description: misc utils. | |
12 | */ | |
69b7e41e | 13 | #include <ctype.h> |
69b7e41e KZ |
14 | #include <fcntl.h> |
15 | #include <pwd.h> | |
a1e8af75 | 16 | #include <grp.h> |
69b7e41e | 17 | |
b49103ed | 18 | #include "strutils.h" |
0532ba1d | 19 | #include "pathnames.h" |
69b7e41e | 20 | #include "mountP.h" |
3c5e4ef8 | 21 | #include "mangle.h" |
0bb44be3 | 22 | #include "canonicalize.h" |
035507c8 | 23 | #include "env.h" |
b483debb | 24 | #include "match.h" |
69b7e41e | 25 | |
b49103ed KZ |
26 | int endswith(const char *s, const char *sx) |
27 | { | |
28 | ssize_t off; | |
29 | ||
30 | assert(s); | |
31 | assert(sx); | |
32 | ||
33 | off = strlen(s); | |
34 | if (!off) | |
35 | return 0; | |
36 | off -= strlen(sx); | |
37 | if (off < 0) | |
38 | return 0; | |
39 | ||
40 | return !strcmp(s + off, sx); | |
41 | } | |
42 | ||
43 | int startswith(const char *s, const char *sx) | |
44 | { | |
45 | size_t off; | |
46 | ||
47 | assert(s); | |
48 | assert(sx); | |
49 | ||
50 | off = strlen(sx); | |
51 | if (!off) | |
52 | return 0; | |
53 | ||
54 | return !strncmp(s, sx, off); | |
55 | } | |
56 | ||
fd1eb7a7 KZ |
57 | int mnt_parse_offset(const char *str, size_t len, uintmax_t *res) |
58 | { | |
59 | char *p; | |
60 | int rc = 0; | |
61 | ||
0208ae2e | 62 | if (!str || !*str) |
fd1eb7a7 KZ |
63 | return -EINVAL; |
64 | ||
65 | p = strndup(str, len); | |
66 | if (!p) | |
67 | return -errno; | |
68 | ||
69 | if (strtosize(p, res)) | |
70 | rc = -EINVAL; | |
71 | free(p); | |
72 | return rc; | |
73 | } | |
74 | ||
7383ebce DR |
75 | /* used as a callback by bsearch in mnt_fstype_is_pseudofs() */ |
76 | static int fstype_cmp(const void *v1, const void *v2) | |
77 | { | |
78 | const char *s1 = *(const char **)v1; | |
79 | const char *s2 = *(const char **)v2; | |
80 | ||
81 | return strcmp(s1, s2); | |
82 | } | |
83 | ||
1d0cd73f KZ |
84 | /* returns basename and keeps dirname in the @path, if @path is "/" (root) |
85 | * then returns empty string */ | |
86 | static char *stripoff_last_component(char *path) | |
87 | { | |
88 | char *p = path ? strrchr(path, '/') : NULL; | |
89 | ||
90 | if (!p) | |
91 | return NULL; | |
92 | *p = '\0'; | |
61073773 | 93 | return p + 1; |
1d0cd73f KZ |
94 | } |
95 | ||
61073773 KZ |
96 | /* |
97 | * Note that the @target has to be absolute path (so at least "/"). The | |
98 | * @filename returns allocated buffer with last path component, for example: | |
99 | * | |
100 | * mnt_chdir_to_parent("/mnt/test", &buf) ==> chdir("/mnt"), buf="test" | |
66bb8267 KZ |
101 | */ |
102 | int mnt_chdir_to_parent(const char *target, char **filename) | |
103 | { | |
61073773 | 104 | char *buf, *parent, *last = NULL; |
66bb8267 KZ |
105 | char cwd[PATH_MAX]; |
106 | int rc = -EINVAL; | |
107 | ||
108 | if (!target || *target != '/') | |
109 | return -EINVAL; | |
110 | ||
61073773 KZ |
111 | DBG(UTILS, mnt_debug("moving to %s parent", target)); |
112 | ||
113 | buf = strdup(target); | |
114 | if (!buf) | |
66bb8267 KZ |
115 | return -ENOMEM; |
116 | ||
61073773 KZ |
117 | if (*(buf + 1) != '\0') { |
118 | last = stripoff_last_component(buf); | |
66bb8267 KZ |
119 | if (!last) |
120 | goto err; | |
121 | } | |
66bb8267 | 122 | |
61073773 KZ |
123 | parent = buf && *buf ? buf : "/"; |
124 | ||
125 | if (chdir(parent) == -1) { | |
126 | DBG(UTILS, mnt_debug("failed to chdir to %s: %m", parent)); | |
66bb8267 KZ |
127 | rc = -errno; |
128 | goto err; | |
129 | } | |
130 | if (!getcwd(cwd, sizeof(cwd))) { | |
131 | DBG(UTILS, mnt_debug("failed to obtain current directory: %m")); | |
132 | rc = -errno; | |
133 | goto err; | |
134 | } | |
61073773 KZ |
135 | if (strcmp(cwd, parent) != 0) { |
136 | DBG(UTILS, mnt_debug( | |
137 | "unexpected chdir (expected=%s, cwd=%s)", parent, cwd)); | |
66bb8267 KZ |
138 | goto err; |
139 | } | |
140 | ||
61073773 KZ |
141 | DBG(CXT, mnt_debug( |
142 | "current directory moved to %s [last_component='%s']", | |
143 | parent, last)); | |
66bb8267 | 144 | |
61073773 | 145 | *filename = buf; |
66bb8267 KZ |
146 | |
147 | if (!last || !*last) | |
148 | memcpy(*filename, ".", 2); | |
149 | else | |
150 | memcpy(*filename, last, strlen(last) + 1); | |
151 | return 0; | |
152 | err: | |
61073773 | 153 | free(buf); |
66bb8267 KZ |
154 | return rc; |
155 | } | |
156 | ||
f9906424 KZ |
157 | /* |
158 | * Check if @path is on read-only filesystem independently on file permissions. | |
159 | */ | |
160 | int mnt_is_readonly(const char *path) | |
161 | { | |
162 | if (access(path, W_OK) == 0) | |
163 | return 0; | |
164 | if (errno == EROFS) | |
165 | return 1; | |
166 | if (errno != EACCES) | |
167 | return 0; | |
168 | ||
169 | #ifdef HAVE_FUTIMENS | |
170 | /* | |
171 | * access(2) returns EACCES on read-only FS: | |
172 | * | |
173 | * - for set-uid application if one component of the path is not | |
174 | * accessible for the current rUID. (Note that euidaccess(2) does not | |
175 | * check for EROFS at all). | |
176 | * | |
177 | * - for read-write filesystem with read-only VFS node (aka -o remount,ro,bind) | |
178 | */ | |
179 | { | |
180 | struct timespec times[2]; | |
181 | ||
182 | times[0].tv_nsec = UTIME_NOW; /* atime */ | |
183 | times[1].tv_nsec = UTIME_OMIT; /* mtime */ | |
184 | ||
185 | if (utimensat(AT_FDCWD, path, times, 0) == -1) | |
186 | return errno == EROFS; | |
187 | } | |
188 | #endif | |
189 | return 0; | |
190 | } | |
191 | ||
3c5e4ef8 KZ |
192 | /** |
193 | * mnt_mangle: | |
194 | * @str: string | |
195 | * | |
196 | * Encode @str to be compatible with fstab/mtab | |
197 | * | |
198 | * Returns: new allocated string or NULL in case of error. | |
199 | */ | |
200 | char *mnt_mangle(const char *str) | |
201 | { | |
202 | return mangle(str); | |
203 | } | |
204 | ||
205 | /** | |
206 | * mnt_unmangle: | |
207 | * @str: string | |
208 | * | |
209 | * Decode @str from fstab/mtab | |
210 | * | |
211 | * Returns: new allocated string or NULL in case of error. | |
212 | */ | |
213 | char *mnt_unmangle(const char *str) | |
214 | { | |
dd369652 | 215 | return unmangle(str, NULL); |
3c5e4ef8 KZ |
216 | } |
217 | ||
69b7e41e KZ |
218 | /** |
219 | * mnt_fstype_is_pseudofs: | |
220 | * @type: filesystem name | |
221 | * | |
222 | * Returns: 1 for filesystems like proc, sysfs, ... or 0. | |
223 | */ | |
224 | int mnt_fstype_is_pseudofs(const char *type) | |
225 | { | |
7383ebce DR |
226 | /* This array must remain sorted when adding new fstypes */ |
227 | static const char *pseudofs[] = { | |
228 | "anon_inodefs", | |
229 | "autofs", | |
230 | "bdev", | |
231 | "binfmt_misc", | |
232 | "cgroup", | |
233 | "configfs", | |
234 | "cpuset", | |
235 | "debugfs", | |
236 | "devfs", | |
237 | "devpts", | |
238 | "devtmpfs", | |
239 | "dlmfs", | |
240 | "fuse.gvfs-fuse-daemon", | |
241 | "fusectl", | |
242 | "hugetlbfs", | |
243 | "mqueue", | |
244 | "nfsd", | |
245 | "none", | |
246 | "pipefs", | |
247 | "proc", | |
248 | "pstore", | |
249 | "ramfs", | |
250 | "rootfs", | |
251 | "rpc_pipefs", | |
252 | "securityfs", | |
253 | "sockfs", | |
254 | "spufs", | |
255 | "sysfs", | |
256 | "tmpfs" | |
257 | }; | |
258 | ||
259 | return !(bsearch(&type, pseudofs, ARRAY_SIZE(pseudofs), | |
260 | sizeof(char*), fstype_cmp) == NULL); | |
69b7e41e KZ |
261 | } |
262 | ||
263 | /** | |
264 | * mnt_fstype_is_netfs: | |
265 | * @type: filesystem name | |
266 | * | |
267 | * Returns: 1 for filesystems like cifs, nfs, ... or 0. | |
268 | */ | |
269 | int mnt_fstype_is_netfs(const char *type) | |
270 | { | |
271 | if (!type) | |
272 | return 0; | |
c59cf20c | 273 | if (strcmp(type, "cifs") == 0 || |
69b7e41e | 274 | strcmp(type, "smbfs") == 0 || |
c59cf20c KZ |
275 | strncmp(type,"nfs", 3) == 0 || |
276 | strcmp(type, "afs") == 0 || | |
277 | strcmp(type, "ncpfs") == 0 || | |
278 | strncmp(type,"9p", 2) == 0) | |
69b7e41e KZ |
279 | return 1; |
280 | return 0; | |
281 | } | |
282 | ||
abc9c0f7 KZ |
283 | /** |
284 | * mnt_match_fstype: | |
285 | * @type: filesystem type | |
6ad929bb | 286 | * @pattern: filesystem name or comma delimited list of names |
abc9c0f7 KZ |
287 | * |
288 | * The @pattern list of filesystem can be prefixed with a global | |
289 | * "no" prefix to invert matching of the whole list. The "no" could | |
6ad929bb | 290 | * also be used for individual items in the @pattern list. So, |
3d735589 | 291 | * "nofoo,bar" has the same meaning as "nofoo,nobar". |
abc9c0f7 | 292 | * |
3d735589 KZ |
293 | * "bar" : "nofoo,bar" -> False (global "no" prefix) |
294 | * | |
295 | * "bar" : "foo,bar" -> True | |
abc9c0f7 | 296 | * |
abc9c0f7 KZ |
297 | * "bar" : "foo,nobar" -> False |
298 | * | |
299 | * Returns: 1 if type is matching, else 0. This function also returns | |
300 | * 0 if @pattern is NULL and @type is non-NULL. | |
301 | */ | |
302 | int mnt_match_fstype(const char *type, const char *pattern) | |
303 | { | |
12089155 | 304 | return match_fstype(type, pattern); |
abc9c0f7 KZ |
305 | } |
306 | ||
307 | ||
308 | /* Returns 1 if needle found or noneedle not found in haystack | |
309 | * Otherwise returns 0 | |
310 | */ | |
311 | static int check_option(const char *haystack, size_t len, | |
312 | const char *needle, size_t needle_len) | |
313 | { | |
314 | const char *p; | |
315 | int no = 0; | |
316 | ||
ede8a60e KZ |
317 | if (needle_len >= 1 && *needle == '+') { |
318 | needle++; | |
319 | needle_len--; | |
320 | } else if (needle_len >= 2 && !strncmp(needle, "no", 2)) { | |
abc9c0f7 KZ |
321 | no = 1; |
322 | needle += 2; | |
323 | needle_len -= 2; | |
324 | } | |
325 | ||
326 | for (p = haystack; p && p < haystack + len; p++) { | |
327 | char *sep = strchr(p, ','); | |
7fc6d2b8 KZ |
328 | size_t plen = sep ? (size_t) (sep - p) : |
329 | len - (p - haystack); | |
abc9c0f7 KZ |
330 | |
331 | if (plen == needle_len) { | |
332 | if (!strncmp(p, needle, plen)) | |
333 | return !no; /* foo or nofoo was found */ | |
334 | } | |
335 | p += plen; | |
336 | } | |
337 | ||
338 | return no; /* foo or nofoo was not found */ | |
339 | } | |
340 | ||
341 | /** | |
342 | * mnt_match_options: | |
343 | * @optstr: options string | |
6ad929bb | 344 | * @pattern: comma delimited list of options |
abc9c0f7 KZ |
345 | * |
346 | * The "no" could used for individual items in the @options list. The "no" | |
6ad929bb | 347 | * prefix does not have a global meaning. |
abc9c0f7 KZ |
348 | * |
349 | * Unlike fs type matching, nonetdev,user and nonetdev,nouser have | |
350 | * DIFFERENT meanings; each option is matched explicitly as specified. | |
351 | * | |
ede8a60e KZ |
352 | * The "no" prefix interpretation could be disable by "+" prefix, for example |
353 | * "+noauto" matches if @optstr literally contains "noauto" string. | |
354 | * | |
3d735589 KZ |
355 | * "xxx,yyy,zzz" : "nozzz" -> False |
356 | * | |
357 | * "xxx,yyy,zzz" : "xxx,noeee" -> True | |
abc9c0f7 | 358 | * |
ede8a60e KZ |
359 | * "bar,zzz" : "nofoo" -> True |
360 | * | |
361 | * "nofoo,bar" : "+nofoo" -> True | |
362 | * | |
363 | * "bar,zzz" : "+nofoo" -> False | |
364 | * | |
365 | * | |
abc9c0f7 KZ |
366 | * Returns: 1 if pattern is matching, else 0. This function also returns 0 |
367 | * if @pattern is NULL and @optstr is non-NULL. | |
368 | */ | |
369 | int mnt_match_options(const char *optstr, const char *pattern) | |
370 | { | |
371 | const char *p; | |
372 | size_t len, optstr_len = 0; | |
373 | ||
374 | if (!pattern && !optstr) | |
375 | return 1; | |
376 | if (!pattern) | |
377 | return 0; | |
378 | ||
379 | len = strlen(pattern); | |
380 | if (optstr) | |
381 | optstr_len = strlen(optstr); | |
382 | ||
383 | for (p = pattern; p < pattern + len; p++) { | |
384 | char *sep = strchr(p, ','); | |
7fc6d2b8 KZ |
385 | size_t plen = sep ? (size_t) (sep - p) : |
386 | len - (p - pattern); | |
abc9c0f7 KZ |
387 | |
388 | if (!plen) | |
389 | continue; /* if two ',' appear in a row */ | |
390 | ||
391 | if (!check_option(optstr, optstr_len, p, plen)) | |
392 | return 0; /* any match failure means failure */ | |
393 | ||
394 | p += plen; | |
395 | } | |
396 | ||
397 | /* no match failures in list means success */ | |
398 | return 1; | |
399 | } | |
400 | ||
97e23b5e KZ |
401 | void mnt_free_filesystems(char **filesystems) |
402 | { | |
403 | char **p; | |
404 | ||
405 | if (!filesystems) | |
406 | return; | |
407 | for (p = filesystems; *p; p++) | |
408 | free(*p); | |
409 | free(filesystems); | |
410 | } | |
411 | ||
412 | static int add_filesystem(char ***filesystems, char *name) | |
413 | { | |
414 | int n = 0; | |
415 | ||
416 | assert(filesystems); | |
417 | assert(name); | |
418 | ||
419 | if (*filesystems) { | |
420 | char **p; | |
421 | for (n = 0, p = *filesystems; *p; p++, n++) { | |
422 | if (strcmp(*p, name) == 0) | |
423 | return 0; | |
424 | } | |
425 | } | |
426 | ||
427 | #define MYCHUNK 16 | |
428 | ||
429 | if (n == 0 || !((n + 1) % MYCHUNK)) { | |
430 | size_t items = ((n + 1 + MYCHUNK) / MYCHUNK) * MYCHUNK; | |
431 | char **x = realloc(*filesystems, items * sizeof(char *)); | |
432 | ||
433 | if (!x) | |
434 | goto err; | |
435 | *filesystems = x; | |
436 | } | |
437 | name = strdup(name); | |
438 | if (!name) | |
439 | goto err; | |
440 | (*filesystems)[n] = name; | |
441 | (*filesystems)[n + 1] = NULL; | |
442 | return 0; | |
443 | err: | |
444 | mnt_free_filesystems(*filesystems); | |
445 | return -ENOMEM; | |
446 | } | |
447 | ||
448 | static int get_filesystems(const char *filename, char ***filesystems, const char *pattern) | |
449 | { | |
4f69189f | 450 | int rc = 0; |
97e23b5e KZ |
451 | FILE *f; |
452 | char line[128]; | |
453 | ||
454 | f = fopen(filename, "r"); | |
455 | if (!f) | |
456 | return 0; | |
457 | ||
458 | while (fgets(line, sizeof(line), f)) { | |
459 | char name[sizeof(line)]; | |
97e23b5e KZ |
460 | |
461 | if (*line == '#' || strncmp(line, "nodev", 5) == 0) | |
462 | continue; | |
463 | if (sscanf(line, " %128[^\n ]\n", name) != 1) | |
464 | continue; | |
465 | if (pattern && !mnt_match_fstype(name, pattern)) | |
466 | continue; | |
467 | rc = add_filesystem(filesystems, name); | |
468 | if (rc) | |
4f69189f | 469 | break; |
97e23b5e | 470 | } |
4f69189f KZ |
471 | |
472 | fclose(f); | |
473 | return rc; | |
97e23b5e KZ |
474 | } |
475 | ||
476 | int mnt_get_filesystems(char ***filesystems, const char *pattern) | |
477 | { | |
478 | int rc; | |
479 | ||
480 | if (!filesystems) | |
481 | return -EINVAL; | |
482 | *filesystems = NULL; | |
483 | ||
484 | rc = get_filesystems(_PATH_FILESYSTEMS, filesystems, pattern); | |
485 | if (rc) | |
486 | return rc; | |
487 | return get_filesystems(_PATH_PROC_FILESYSTEMS, filesystems, pattern); | |
488 | } | |
489 | ||
2af0a839 KZ |
490 | static size_t get_pw_record_size(void) |
491 | { | |
492 | #ifdef _SC_GETPW_R_SIZE_MAX | |
493 | long sz = sysconf(_SC_GETPW_R_SIZE_MAX); | |
494 | if (sz > 0) | |
495 | return sz; | |
496 | #endif | |
497 | return 16384; | |
498 | } | |
499 | ||
69b7e41e KZ |
500 | /* |
501 | * Returns allocated string with username or NULL. | |
502 | */ | |
503 | char *mnt_get_username(const uid_t uid) | |
504 | { | |
505 | struct passwd pwd; | |
506 | struct passwd *res; | |
2af0a839 | 507 | size_t sz = get_pw_record_size(); |
69b7e41e KZ |
508 | char *buf, *username = NULL; |
509 | ||
69b7e41e KZ |
510 | buf = malloc(sz); |
511 | if (!buf) | |
512 | return NULL; | |
513 | ||
514 | if (!getpwuid_r(uid, &pwd, buf, sz, &res) && res) | |
515 | username = strdup(pwd.pw_name); | |
516 | ||
517 | free(buf); | |
518 | return username; | |
519 | } | |
abc9c0f7 | 520 | |
a1e8af75 KZ |
521 | int mnt_get_uid(const char *username, uid_t *uid) |
522 | { | |
188dc15a | 523 | int rc = -1; |
a1e8af75 KZ |
524 | struct passwd pwd; |
525 | struct passwd *pw; | |
2af0a839 | 526 | size_t sz = get_pw_record_size(); |
a1e8af75 KZ |
527 | char *buf; |
528 | ||
188dc15a KZ |
529 | if (!username || !uid) |
530 | return -EINVAL; | |
b47b7b3a | 531 | |
a1e8af75 KZ |
532 | buf = malloc(sz); |
533 | if (!buf) | |
534 | return -ENOMEM; | |
535 | ||
188dc15a | 536 | if (!getpwnam_r(username, &pwd, buf, sz, &pw) && pw) { |
a1e8af75 | 537 | *uid= pw->pw_uid; |
188dc15a KZ |
538 | rc = 0; |
539 | } else { | |
540 | DBG(UTILS, mnt_debug( | |
541 | "cannot convert '%s' username to UID", username)); | |
61f5ff6c | 542 | rc = errno ? -errno : -EINVAL; |
188dc15a | 543 | } |
a1e8af75 KZ |
544 | |
545 | free(buf); | |
188dc15a | 546 | return rc; |
a1e8af75 KZ |
547 | } |
548 | ||
549 | int mnt_get_gid(const char *groupname, gid_t *gid) | |
550 | { | |
188dc15a | 551 | int rc = -1; |
a1e8af75 KZ |
552 | struct group grp; |
553 | struct group *gr; | |
2af0a839 | 554 | size_t sz = get_pw_record_size(); |
a1e8af75 KZ |
555 | char *buf; |
556 | ||
188dc15a KZ |
557 | if (!groupname || !gid) |
558 | return -EINVAL; | |
b47b7b3a | 559 | |
a1e8af75 KZ |
560 | buf = malloc(sz); |
561 | if (!buf) | |
562 | return -ENOMEM; | |
563 | ||
188dc15a | 564 | if (!getgrnam_r(groupname, &grp, buf, sz, &gr) && gr) { |
a1e8af75 | 565 | *gid= gr->gr_gid; |
188dc15a KZ |
566 | rc = 0; |
567 | } else { | |
568 | DBG(UTILS, mnt_debug( | |
569 | "cannot convert '%s' groupname to GID", groupname)); | |
61f5ff6c | 570 | rc = errno ? -errno : -EINVAL; |
188dc15a | 571 | } |
a1e8af75 KZ |
572 | |
573 | free(buf); | |
188dc15a KZ |
574 | return rc; |
575 | } | |
576 | ||
577 | int mnt_in_group(gid_t gid) | |
578 | { | |
579 | int rc = 0, n, i; | |
580 | gid_t *grps = NULL; | |
581 | ||
582 | if (getgid() == gid) | |
583 | return 1; | |
584 | ||
585 | n = getgroups(0, NULL); | |
586 | if (n <= 0) | |
587 | goto done; | |
588 | ||
589 | grps = malloc(n * sizeof(*grps)); | |
590 | if (!grps) | |
591 | goto done; | |
592 | ||
593 | if (getgroups(n, grps) == n) { | |
594 | for (i = 0; i < n; i++) { | |
595 | if (grps[i] == gid) { | |
596 | rc = 1; | |
597 | break; | |
598 | } | |
599 | } | |
600 | } | |
601 | done: | |
602 | free(grps); | |
603 | return rc; | |
a1e8af75 KZ |
604 | } |
605 | ||
1d0cd73f KZ |
606 | static int try_write(const char *filename) |
607 | { | |
608 | int fd; | |
609 | ||
610 | if (!filename) | |
611 | return -EINVAL; | |
612 | ||
b0bb8fb6 KZ |
613 | fd = open(filename, O_RDWR|O_CREAT, S_IWUSR| \ |
614 | S_IRUSR|S_IRGRP|S_IROTH); | |
1d0cd73f KZ |
615 | if (fd >= 0) { |
616 | close(fd); | |
617 | return 0; | |
618 | } | |
619 | return -errno; | |
620 | } | |
621 | ||
622 | /** | |
623 | * mnt_has_regular_mtab: | |
624 | * @mtab: returns path to mtab | |
625 | * @writable: returns 1 if the file is writable | |
626 | * | |
627 | * If the file does not exist and @writable argument is not NULL then it will | |
628 | * try to create the file | |
629 | * | |
6ad929bb | 630 | * Returns: 1 if /etc/mtab is a regular file, and 0 in case of error (check |
1d0cd73f | 631 | * errno for more details). |
0532ba1d | 632 | */ |
1d0cd73f | 633 | int mnt_has_regular_mtab(const char **mtab, int *writable) |
0532ba1d KZ |
634 | { |
635 | struct stat st; | |
70bf97ae | 636 | int rc; |
1d0cd73f | 637 | const char *filename = mtab && *mtab ? *mtab : mnt_get_mtab_path(); |
0532ba1d | 638 | |
7c118af7 KZ |
639 | if (writable) |
640 | *writable = 0; | |
70bf97ae | 641 | if (mtab && !*mtab) |
1d0cd73f KZ |
642 | *mtab = filename; |
643 | ||
644 | DBG(UTILS, mnt_debug("mtab: %s", filename)); | |
70bf97ae | 645 | |
1d0cd73f KZ |
646 | rc = lstat(filename, &st); |
647 | ||
648 | if (rc == 0) { | |
649 | /* file exist */ | |
650 | if (S_ISREG(st.st_mode)) { | |
651 | if (writable) | |
652 | *writable = !try_write(filename); | |
653 | return 1; | |
654 | } | |
7c118af7 | 655 | goto done; |
1d0cd73f KZ |
656 | } |
657 | ||
658 | /* try to create the file */ | |
70bf97ae | 659 | if (writable) { |
1d0cd73f | 660 | *writable = !try_write(filename); |
7c118af7 KZ |
661 | if (*writable) |
662 | return 1; | |
1d0cd73f KZ |
663 | } |
664 | ||
7c118af7 KZ |
665 | done: |
666 | DBG(UTILS, mnt_debug("%s: irregular/non-writable", filename)); | |
1d0cd73f KZ |
667 | return 0; |
668 | } | |
7c118af7 | 669 | |
77417bc0 KZ |
670 | /* |
671 | * Don't export this to libmount API -- utab is private library stuff. | |
1d0cd73f KZ |
672 | * |
673 | * If the file does not exist and @writable argument is not NULL then it will | |
a362ae60 | 674 | * try to create the directory (e.g. /run/mount) and the file. |
1d0cd73f | 675 | * |
a362ae60 | 676 | * Returns: 1 if utab is a regular file, and 0 in case of |
6f5788c5 | 677 | * error (check errno for more details). |
1d0cd73f | 678 | */ |
1d0cd73f KZ |
679 | int mnt_has_regular_utab(const char **utab, int *writable) |
680 | { | |
681 | struct stat st; | |
682 | int rc; | |
683 | const char *filename = utab && *utab ? *utab : mnt_get_utab_path(); | |
684 | ||
7c118af7 KZ |
685 | if (writable) |
686 | *writable = 0; | |
1d0cd73f KZ |
687 | if (utab && !*utab) |
688 | *utab = filename; | |
689 | ||
690 | DBG(UTILS, mnt_debug("utab: %s", filename)); | |
691 | ||
692 | rc = lstat(filename, &st); | |
693 | ||
694 | if (rc == 0) { | |
695 | /* file exist */ | |
696 | if (S_ISREG(st.st_mode)) { | |
697 | if (writable) | |
7c118af7 | 698 | *writable = !try_write(filename); |
1d0cd73f | 699 | return 1; |
70bf97ae | 700 | } |
7c118af7 | 701 | goto done; /* it's not regular file */ |
70bf97ae | 702 | } |
1d0cd73f KZ |
703 | |
704 | if (writable) { | |
705 | char *dirname = strdup(filename); | |
706 | ||
707 | if (!dirname) | |
7c118af7 | 708 | goto done; |
1d0cd73f KZ |
709 | |
710 | stripoff_last_component(dirname); /* remove filename */ | |
711 | ||
b0bb8fb6 KZ |
712 | rc = mkdir(dirname, S_IWUSR| |
713 | S_IRUSR|S_IRGRP|S_IROTH| | |
714 | S_IXUSR|S_IXGRP|S_IXOTH); | |
1d0cd73f KZ |
715 | free(dirname); |
716 | if (rc && errno != EEXIST) | |
7c118af7 | 717 | goto done; /* probably EACCES */ |
1d0cd73f KZ |
718 | |
719 | *writable = !try_write(filename); | |
7c118af7 KZ |
720 | if (*writable) |
721 | return 1; | |
1d0cd73f | 722 | } |
7c118af7 KZ |
723 | done: |
724 | DBG(UTILS, mnt_debug("%s: irregular/non-writable file", filename)); | |
1d0cd73f | 725 | return 0; |
0532ba1d KZ |
726 | } |
727 | ||
ce4dd666 KZ |
728 | /** |
729 | * mnt_get_swaps_path: | |
730 | * | |
731 | * Returns: path to /proc/swaps or $LIBMOUNT_SWAPS. | |
732 | */ | |
733 | const char *mnt_get_swaps_path(void) | |
734 | { | |
735 | const char *p = safe_getenv("LIBMOUNT_SWAPS"); | |
736 | return p ? : _PATH_PROC_SWAPS; | |
737 | } | |
738 | ||
3a5b1b1d KZ |
739 | /** |
740 | * mnt_get_fstab_path: | |
741 | * | |
742 | * Returns: path to /etc/fstab or $LIBMOUNT_FSTAB. | |
743 | */ | |
744 | const char *mnt_get_fstab_path(void) | |
745 | { | |
035507c8 | 746 | const char *p = safe_getenv("LIBMOUNT_FSTAB"); |
3a5b1b1d KZ |
747 | return p ? : _PATH_MNTTAB; |
748 | } | |
749 | ||
750 | /** | |
751 | * mnt_get_mtab_path: | |
752 | * | |
b37dd175 | 753 | * This function returns *default* location of the mtab file. The result does |
0f32f1e2 | 754 | * not have to be writable. See also mnt_has_regular_mtab(). |
3a5b1b1d KZ |
755 | * |
756 | * Returns: path to /etc/mtab or $LIBMOUNT_MTAB. | |
757 | */ | |
758 | const char *mnt_get_mtab_path(void) | |
759 | { | |
035507c8 | 760 | const char *p = safe_getenv("LIBMOUNT_MTAB"); |
3a5b1b1d KZ |
761 | return p ? : _PATH_MOUNTED; |
762 | } | |
763 | ||
77417bc0 KZ |
764 | /* |
765 | * Don't export this to libmount API -- utab is private library stuff. | |
be1a5180 | 766 | * |
a362ae60 | 767 | * Returns: path to /run/mount/utab (or /dev/.mount/utab) or $LIBMOUNT_UTAB. |
b37dd175 KZ |
768 | */ |
769 | const char *mnt_get_utab_path(void) | |
770 | { | |
a362ae60 | 771 | struct stat st; |
035507c8 | 772 | const char *p = safe_getenv("LIBMOUNT_UTAB"); |
a362ae60 KZ |
773 | |
774 | if (p) | |
775 | return p; | |
776 | ||
777 | if (stat(MNT_RUNTIME_TOPDIR, &st) == 0) | |
778 | return MNT_PATH_UTAB; | |
779 | ||
780 | return MNT_PATH_UTAB_OLD; | |
b37dd175 KZ |
781 | } |
782 | ||
d1be0c34 | 783 | |
b37dd175 KZ |
784 | /* returns file descriptor or -errno, @name returns uniques filename |
785 | */ | |
4b6cf485 | 786 | int mnt_open_uniq_filename(const char *filename, char **name) |
b37dd175 KZ |
787 | { |
788 | int rc, fd; | |
789 | char *n; | |
790 | ||
791 | assert(filename); | |
792 | ||
793 | if (name) | |
794 | *name = NULL; | |
795 | ||
796 | rc = asprintf(&n, "%s.XXXXXX", filename); | |
797 | if (rc <= 0) | |
798 | return -errno; | |
799 | ||
4b6cf485 | 800 | fd = mkstemp(n); |
b37dd175 KZ |
801 | if (fd >= 0 && name) |
802 | *name = n; | |
803 | else | |
804 | free(n); | |
805 | ||
806 | return fd < 0 ? -errno : fd; | |
807 | } | |
0bb44be3 | 808 | |
cd3d6c5b DR |
809 | /** |
810 | * mnt_get_mountpoint: | |
811 | * @path: pathname | |
812 | * | |
813 | * This function finds the mountpoint that a given path resides in. @path | |
814 | * should be canonicalized. The returned pointer should be freed by the caller. | |
815 | * | |
816 | * Returns: target of mounted device or NULL on error | |
817 | */ | |
0bb44be3 KZ |
818 | char *mnt_get_mountpoint(const char *path) |
819 | { | |
820 | char *mnt = strdup(path); | |
821 | struct stat st; | |
822 | dev_t dir, base; | |
823 | ||
824 | if (!mnt) | |
825 | return NULL; | |
826 | if (*mnt == '/' && *(mnt + 1) == '\0') | |
9758c88a | 827 | goto done; |
0bb44be3 KZ |
828 | |
829 | if (stat(mnt, &st)) | |
830 | goto err; | |
831 | base = st.st_dev; | |
832 | ||
833 | do { | |
834 | char *p = stripoff_last_component(mnt); | |
835 | ||
836 | if (!p) | |
837 | break; | |
838 | if (stat(*mnt ? mnt : "/", &st)) | |
839 | goto err; | |
840 | dir = st.st_dev; | |
841 | if (dir != base) { | |
842 | *(p - 1) = '/'; | |
9758c88a | 843 | goto done; |
0bb44be3 KZ |
844 | } |
845 | base = dir; | |
846 | } while (mnt && *(mnt + 1) != '\0'); | |
847 | ||
848 | memcpy(mnt, "/", 2); | |
9758c88a | 849 | done: |
f84fa6f7 | 850 | DBG(UTILS, mnt_debug("%s mountpoint is %s", path, mnt)); |
9758c88a | 851 | return mnt; |
0bb44be3 KZ |
852 | err: |
853 | free(mnt); | |
854 | return NULL; | |
855 | } | |
856 | ||
9758c88a | 857 | char *mnt_get_fs_root(const char *path, const char *mnt) |
0bb44be3 | 858 | { |
f84fa6f7 | 859 | char *m = (char *) mnt, *res; |
0bb44be3 KZ |
860 | const char *p; |
861 | size_t sz; | |
862 | ||
9758c88a KZ |
863 | if (!m) |
864 | m = mnt_get_mountpoint(path); | |
865 | if (!m) | |
0bb44be3 KZ |
866 | return NULL; |
867 | ||
9758c88a | 868 | sz = strlen(m); |
0bb44be3 KZ |
869 | p = sz > 1 ? path + sz : path; |
870 | ||
9758c88a KZ |
871 | if (m != mnt) |
872 | free(m); | |
0bb44be3 | 873 | |
f84fa6f7 KZ |
874 | res = *p ? strdup(p) : strdup("/"); |
875 | DBG(UTILS, mnt_debug("%s fs-root is %s", path, res)); | |
876 | return res; | |
0bb44be3 KZ |
877 | } |
878 | ||
abc9c0f7 | 879 | #ifdef TEST_PROGRAM |
68164f6c | 880 | int test_match_fstype(struct libmnt_test *ts, int argc, char *argv[]) |
abc9c0f7 KZ |
881 | { |
882 | char *type = argv[1]; | |
883 | char *pattern = argv[2]; | |
884 | ||
885 | printf("%s\n", mnt_match_fstype(type, pattern) ? "MATCH" : "NOT-MATCH"); | |
886 | return 0; | |
887 | } | |
888 | ||
68164f6c | 889 | int test_match_options(struct libmnt_test *ts, int argc, char *argv[]) |
abc9c0f7 KZ |
890 | { |
891 | char *optstr = argv[1]; | |
892 | char *pattern = argv[2]; | |
893 | ||
894 | printf("%s\n", mnt_match_options(optstr, pattern) ? "MATCH" : "NOT-MATCH"); | |
895 | return 0; | |
896 | } | |
897 | ||
68164f6c | 898 | int test_startswith(struct libmnt_test *ts, int argc, char *argv[]) |
b49103ed KZ |
899 | { |
900 | char *optstr = argv[1]; | |
901 | char *pattern = argv[2]; | |
902 | ||
903 | printf("%s\n", startswith(optstr, pattern) ? "YES" : "NOT"); | |
904 | return 0; | |
905 | } | |
906 | ||
68164f6c | 907 | int test_endswith(struct libmnt_test *ts, int argc, char *argv[]) |
b49103ed KZ |
908 | { |
909 | char *optstr = argv[1]; | |
910 | char *pattern = argv[2]; | |
911 | ||
912 | printf("%s\n", endswith(optstr, pattern) ? "YES" : "NOT"); | |
913 | return 0; | |
914 | } | |
915 | ||
68164f6c | 916 | int test_mountpoint(struct libmnt_test *ts, int argc, char *argv[]) |
0bb44be3 KZ |
917 | { |
918 | char *path = canonicalize_path(argv[1]), | |
919 | *mnt = path ? mnt_get_mountpoint(path) : NULL; | |
920 | ||
921 | printf("%s: %s\n", argv[1], mnt ? : "unknown"); | |
922 | free(mnt); | |
923 | free(path); | |
924 | return 0; | |
925 | } | |
926 | ||
68164f6c | 927 | int test_fsroot(struct libmnt_test *ts, int argc, char *argv[]) |
0bb44be3 KZ |
928 | { |
929 | char *path = canonicalize_path(argv[1]), | |
d672fb26 | 930 | *mnt = path ? mnt_get_fs_root(path, NULL) : NULL; |
0bb44be3 KZ |
931 | |
932 | printf("%s: %s\n", argv[1], mnt ? : "unknown"); | |
933 | free(mnt); | |
934 | free(path); | |
935 | return 0; | |
936 | } | |
abc9c0f7 | 937 | |
68164f6c | 938 | int test_filesystems(struct libmnt_test *ts, int argc, char *argv[]) |
97e23b5e KZ |
939 | { |
940 | char **filesystems = NULL; | |
941 | int rc; | |
942 | ||
943 | rc = mnt_get_filesystems(&filesystems, argc ? argv[1] : NULL); | |
944 | if (!rc) { | |
945 | char **p; | |
946 | for (p = filesystems; *p; p++) | |
947 | printf("%s\n", *p); | |
948 | mnt_free_filesystems(filesystems); | |
949 | } | |
950 | return rc; | |
951 | } | |
952 | ||
66bb8267 KZ |
953 | int test_chdir(struct libmnt_test *ts, int argc, char *argv[]) |
954 | { | |
955 | int rc; | |
956 | char *path = canonicalize_path(argv[1]), | |
957 | *last = NULL; | |
958 | ||
959 | if (!path) | |
960 | return -errno; | |
961 | ||
962 | rc = mnt_chdir_to_parent(path, &last); | |
963 | if (!rc) { | |
964 | printf("path='%s', abs='%s', last='%s'\n", | |
965 | argv[1], path, last); | |
966 | } | |
967 | free(path); | |
968 | free(last); | |
969 | return rc; | |
970 | } | |
971 | ||
972 | ||
abc9c0f7 KZ |
973 | int main(int argc, char *argv[]) |
974 | { | |
68164f6c | 975 | struct libmnt_test tss[] = { |
abc9c0f7 KZ |
976 | { "--match-fstype", test_match_fstype, "<type> <pattern> FS types matching" }, |
977 | { "--match-options", test_match_options, "<options> <pattern> options matching" }, | |
97e23b5e | 978 | { "--filesystems", test_filesystems, "[<pattern>] list /{etc,proc}/filesystems" }, |
b49103ed KZ |
979 | { "--starts-with", test_startswith, "<string> <prefix>" }, |
980 | { "--ends-with", test_endswith, "<string> <prefix>" }, | |
0bb44be3 KZ |
981 | { "--mountpoint", test_mountpoint, "<path>" }, |
982 | { "--fs-root", test_fsroot, "<path>" }, | |
66bb8267 | 983 | { "--cd-parent", test_chdir, "<path>" }, |
abc9c0f7 KZ |
984 | { NULL } |
985 | }; | |
986 | ||
987 | return mnt_run_test(tss, argc, argv); | |
988 | } | |
989 | ||
990 | #endif /* TEST_PROGRAM */ |