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[thirdparty/systemd.git] / src / tmpfiles / tmpfiles.c
1 /* SPDX-License-Identifier: LGPL-2.1+ */
2
3 #include <errno.h>
4 #include <fcntl.h>
5 #include <fnmatch.h>
6 #include <getopt.h>
7 #include <glob.h>
8 #include <limits.h>
9 #include <linux/fs.h>
10 #include <stdbool.h>
11 #include <stddef.h>
12 #include <stdio.h>
13 #include <stdlib.h>
14 #include <string.h>
15 #include <sys/stat.h>
16 #include <sys/xattr.h>
17 #include <sysexits.h>
18 #include <time.h>
19 #include <unistd.h>
20
21 #include "sd-path.h"
22
23 #include "acl-util.h"
24 #include "alloc-util.h"
25 #include "btrfs-util.h"
26 #include "capability-util.h"
27 #include "chattr-util.h"
28 #include "conf-files.h"
29 #include "copy.h"
30 #include "def.h"
31 #include "dirent-util.h"
32 #include "escape.h"
33 #include "fd-util.h"
34 #include "fileio.h"
35 #include "format-util.h"
36 #include "fs-util.h"
37 #include "glob-util.h"
38 #include "io-util.h"
39 #include "label.h"
40 #include "log.h"
41 #include "macro.h"
42 #include "missing.h"
43 #include "mkdir.h"
44 #include "mount-util.h"
45 #include "pager.h"
46 #include "parse-util.h"
47 #include "path-lookup.h"
48 #include "path-util.h"
49 #include "rm-rf.h"
50 #include "selinux-util.h"
51 #include "set.h"
52 #include "specifier.h"
53 #include "stat-util.h"
54 #include "stdio-util.h"
55 #include "string-table.h"
56 #include "string-util.h"
57 #include "strv.h"
58 #include "terminal-util.h"
59 #include "umask-util.h"
60 #include "user-util.h"
61 #include "util.h"
62
63 /* This reads all files listed in /etc/tmpfiles.d/?*.conf and creates
64 * them in the file system. This is intended to be used to create
65 * properly owned directories beneath /tmp, /var/tmp, /run, which are
66 * volatile and hence need to be recreated on bootup. */
67
68 typedef enum ItemType {
69 /* These ones take file names */
70 CREATE_FILE = 'f',
71 TRUNCATE_FILE = 'F',
72 CREATE_DIRECTORY = 'd',
73 TRUNCATE_DIRECTORY = 'D',
74 CREATE_SUBVOLUME = 'v',
75 CREATE_SUBVOLUME_INHERIT_QUOTA = 'q',
76 CREATE_SUBVOLUME_NEW_QUOTA = 'Q',
77 CREATE_FIFO = 'p',
78 CREATE_SYMLINK = 'L',
79 CREATE_CHAR_DEVICE = 'c',
80 CREATE_BLOCK_DEVICE = 'b',
81 COPY_FILES = 'C',
82
83 /* These ones take globs */
84 WRITE_FILE = 'w',
85 EMPTY_DIRECTORY = 'e',
86 SET_XATTR = 't',
87 RECURSIVE_SET_XATTR = 'T',
88 SET_ACL = 'a',
89 RECURSIVE_SET_ACL = 'A',
90 SET_ATTRIBUTE = 'h',
91 RECURSIVE_SET_ATTRIBUTE = 'H',
92 IGNORE_PATH = 'x',
93 IGNORE_DIRECTORY_PATH = 'X',
94 REMOVE_PATH = 'r',
95 RECURSIVE_REMOVE_PATH = 'R',
96 RELABEL_PATH = 'z',
97 RECURSIVE_RELABEL_PATH = 'Z',
98 ADJUST_MODE = 'm', /* legacy, 'z' is identical to this */
99 } ItemType;
100
101 typedef struct Item {
102 ItemType type;
103
104 char *path;
105 char *argument;
106 char **xattrs;
107 #if HAVE_ACL
108 acl_t acl_access;
109 acl_t acl_default;
110 #endif
111 uid_t uid;
112 gid_t gid;
113 mode_t mode;
114 usec_t age;
115
116 dev_t major_minor;
117 unsigned attribute_value;
118 unsigned attribute_mask;
119
120 bool uid_set:1;
121 bool gid_set:1;
122 bool mode_set:1;
123 bool age_set:1;
124 bool mask_perms:1;
125 bool attribute_set:1;
126
127 bool keep_first_level:1;
128
129 bool force:1;
130
131 bool done:1;
132 } Item;
133
134 typedef struct ItemArray {
135 Item *items;
136 size_t count;
137 size_t size;
138 } ItemArray;
139
140 typedef enum DirectoryType {
141 DIRECTORY_RUNTIME = 0,
142 DIRECTORY_STATE,
143 DIRECTORY_CACHE,
144 DIRECTORY_LOGS,
145 _DIRECTORY_TYPE_MAX,
146 } DirectoryType;
147
148 static bool arg_cat_config = false;
149 static bool arg_user = false;
150 static bool arg_create = false;
151 static bool arg_clean = false;
152 static bool arg_remove = false;
153 static bool arg_boot = false;
154 static bool arg_no_pager = false;
155
156 static char **arg_include_prefixes = NULL;
157 static char **arg_exclude_prefixes = NULL;
158 static char *arg_root = NULL;
159 static char *arg_replace = NULL;
160
161 #define MAX_DEPTH 256
162
163 static OrderedHashmap *items = NULL, *globs = NULL;
164 static Set *unix_sockets = NULL;
165
166 static int specifier_machine_id_safe(char specifier, void *data, void *userdata, char **ret);
167 static int specifier_directory(char specifier, void *data, void *userdata, char **ret);
168
169 static const Specifier specifier_table[] = {
170 { 'm', specifier_machine_id_safe, NULL },
171 { 'b', specifier_boot_id, NULL },
172 { 'H', specifier_host_name, NULL },
173 { 'v', specifier_kernel_release, NULL },
174
175 { 'U', specifier_user_id, NULL },
176 { 'u', specifier_user_name, NULL },
177 { 'h', specifier_user_home, NULL },
178
179 { 't', specifier_directory, UINT_TO_PTR(DIRECTORY_RUNTIME) },
180 { 'S', specifier_directory, UINT_TO_PTR(DIRECTORY_STATE) },
181 { 'C', specifier_directory, UINT_TO_PTR(DIRECTORY_CACHE) },
182 { 'L', specifier_directory, UINT_TO_PTR(DIRECTORY_LOGS) },
183 { 'T', specifier_tmp_dir, NULL },
184 { 'V', specifier_var_tmp_dir, NULL },
185 {}
186 };
187
188 static int specifier_machine_id_safe(char specifier, void *data, void *userdata, char **ret) {
189 int r;
190
191 /* If /etc/machine_id is missing or empty (e.g. in a chroot environment)
192 * return a recognizable error so that the caller can skip the rule
193 * gracefully. */
194
195 r = specifier_machine_id(specifier, data, userdata, ret);
196 if (IN_SET(r, -ENOENT, -ENOMEDIUM))
197 return -ENXIO;
198
199 return r;
200 }
201
202 static int specifier_directory(char specifier, void *data, void *userdata, char **ret) {
203 struct table_entry {
204 uint64_t type;
205 const char *suffix;
206 };
207
208 static const struct table_entry paths_system[] = {
209 [DIRECTORY_RUNTIME] = { SD_PATH_SYSTEM_RUNTIME },
210 [DIRECTORY_STATE] = { SD_PATH_SYSTEM_STATE_PRIVATE },
211 [DIRECTORY_CACHE] = { SD_PATH_SYSTEM_STATE_CACHE },
212 [DIRECTORY_LOGS] = { SD_PATH_SYSTEM_STATE_LOGS },
213 };
214
215 static const struct table_entry paths_user[] = {
216 [DIRECTORY_RUNTIME] = { SD_PATH_USER_RUNTIME },
217 [DIRECTORY_STATE] = { SD_PATH_USER_CONFIGURATION },
218 [DIRECTORY_CACHE] = { SD_PATH_USER_STATE_CACHE },
219 [DIRECTORY_LOGS] = { SD_PATH_USER_CONFIGURATION, "log" },
220 };
221
222 unsigned i;
223 const struct table_entry *paths;
224
225 assert_cc(ELEMENTSOF(paths_system) == ELEMENTSOF(paths_user));
226 paths = arg_user ? paths_user : paths_system;
227
228 i = PTR_TO_UINT(data);
229 assert(i < ELEMENTSOF(paths_system));
230
231 return sd_path_home(paths[i].type, paths[i].suffix, ret);
232 }
233
234 static int log_unresolvable_specifier(const char *filename, unsigned line) {
235 static bool notified = false;
236
237 /* In system mode, this is called when /etc is not fully initialized (e.g.
238 * in a chroot environment) where some specifiers are unresolvable. In user
239 * mode, this is called when some variables are not defined. These cases are
240 * not considered as an error so log at LOG_NOTICE only for the first time
241 * and then downgrade this to LOG_DEBUG for the rest. */
242
243 log_full(notified ? LOG_DEBUG : LOG_NOTICE,
244 "[%s:%u] Failed to resolve specifier: %s, skipping",
245 filename, line,
246 arg_user ? "Required $XDG_... variable not defined" : "uninitialized /etc detected");
247
248 if (!notified)
249 log_notice("All rules containing unresolvable specifiers will be skipped.");
250
251 notified = true;
252 return 0;
253 }
254
255 static int user_config_paths(char*** ret) {
256 _cleanup_strv_free_ char **config_dirs = NULL, **data_dirs = NULL;
257 _cleanup_free_ char *persistent_config = NULL, *runtime_config = NULL, *data_home = NULL;
258 _cleanup_strv_free_ char **res = NULL;
259 int r;
260
261 r = xdg_user_dirs(&config_dirs, &data_dirs);
262 if (r < 0)
263 return r;
264
265 r = xdg_user_config_dir(&persistent_config, "/user-tmpfiles.d");
266 if (r < 0 && r != -ENXIO)
267 return r;
268
269 r = xdg_user_runtime_dir(&runtime_config, "/user-tmpfiles.d");
270 if (r < 0 && r != -ENXIO)
271 return r;
272
273 r = xdg_user_data_dir(&data_home, "/user-tmpfiles.d");
274 if (r < 0 && r != -ENXIO)
275 return r;
276
277 r = strv_extend_strv_concat(&res, config_dirs, "/user-tmpfiles.d");
278 if (r < 0)
279 return r;
280
281 r = strv_extend(&res, persistent_config);
282 if (r < 0)
283 return r;
284
285 r = strv_extend(&res, runtime_config);
286 if (r < 0)
287 return r;
288
289 r = strv_extend(&res, data_home);
290 if (r < 0)
291 return r;
292
293 r = strv_extend_strv_concat(&res, data_dirs, "/user-tmpfiles.d");
294 if (r < 0)
295 return r;
296
297 r = path_strv_make_absolute_cwd(res);
298 if (r < 0)
299 return r;
300
301 *ret = TAKE_PTR(res);
302 return 0;
303 }
304
305 static bool needs_glob(ItemType t) {
306 return IN_SET(t,
307 WRITE_FILE,
308 IGNORE_PATH,
309 IGNORE_DIRECTORY_PATH,
310 REMOVE_PATH,
311 RECURSIVE_REMOVE_PATH,
312 EMPTY_DIRECTORY,
313 ADJUST_MODE,
314 RELABEL_PATH,
315 RECURSIVE_RELABEL_PATH,
316 SET_XATTR,
317 RECURSIVE_SET_XATTR,
318 SET_ACL,
319 RECURSIVE_SET_ACL,
320 SET_ATTRIBUTE,
321 RECURSIVE_SET_ATTRIBUTE);
322 }
323
324 static bool takes_ownership(ItemType t) {
325 return IN_SET(t,
326 CREATE_FILE,
327 TRUNCATE_FILE,
328 CREATE_DIRECTORY,
329 EMPTY_DIRECTORY,
330 TRUNCATE_DIRECTORY,
331 CREATE_SUBVOLUME,
332 CREATE_SUBVOLUME_INHERIT_QUOTA,
333 CREATE_SUBVOLUME_NEW_QUOTA,
334 CREATE_FIFO,
335 CREATE_SYMLINK,
336 CREATE_CHAR_DEVICE,
337 CREATE_BLOCK_DEVICE,
338 COPY_FILES,
339 WRITE_FILE,
340 IGNORE_PATH,
341 IGNORE_DIRECTORY_PATH,
342 REMOVE_PATH,
343 RECURSIVE_REMOVE_PATH);
344 }
345
346 static struct Item* find_glob(OrderedHashmap *h, const char *match) {
347 ItemArray *j;
348 Iterator i;
349
350 ORDERED_HASHMAP_FOREACH(j, h, i) {
351 unsigned n;
352
353 for (n = 0; n < j->count; n++) {
354 Item *item = j->items + n;
355
356 if (fnmatch(item->path, match, FNM_PATHNAME|FNM_PERIOD) == 0)
357 return item;
358 }
359 }
360
361 return NULL;
362 }
363
364 static void load_unix_sockets(void) {
365 _cleanup_fclose_ FILE *f = NULL;
366 int r;
367
368 if (unix_sockets)
369 return;
370
371 /* We maintain a cache of the sockets we found in /proc/net/unix to speed things up a little. */
372
373 unix_sockets = set_new(&path_hash_ops);
374 if (!unix_sockets) {
375 log_oom();
376 return;
377 }
378
379 f = fopen("/proc/net/unix", "re");
380 if (!f) {
381 log_full_errno(errno == ENOENT ? LOG_DEBUG : LOG_WARNING, errno,
382 "Failed to open /proc/net/unix, ignoring: %m");
383 goto fail;
384 }
385
386 /* Skip header */
387 r = read_line(f, LONG_LINE_MAX, NULL);
388 if (r < 0) {
389 log_warning_errno(r, "Failed to skip /proc/net/unix header line: %m");
390 goto fail;
391 }
392 if (r == 0) {
393 log_warning("Premature end of file reading /proc/net/unix.");
394 goto fail;
395 }
396
397 for (;;) {
398 _cleanup_free_ char *line = NULL;
399 char *p, *s;
400
401 r = read_line(f, LONG_LINE_MAX, &line);
402 if (r < 0) {
403 log_warning_errno(r, "Failed to read /proc/net/unix line, ignoring: %m");
404 goto fail;
405 }
406 if (r == 0) /* EOF */
407 break;
408
409 p = strchr(line, ':');
410 if (!p)
411 continue;
412
413 if (strlen(p) < 37)
414 continue;
415
416 p += 37;
417 p += strspn(p, WHITESPACE);
418 p += strcspn(p, WHITESPACE); /* skip one more word */
419 p += strspn(p, WHITESPACE);
420
421 if (*p != '/')
422 continue;
423
424 s = strdup(p);
425 if (!s) {
426 log_oom();
427 goto fail;
428 }
429
430 path_simplify(s, false);
431
432 r = set_consume(unix_sockets, s);
433 if (r < 0 && r != -EEXIST) {
434 log_warning_errno(r, "Failed to add AF_UNIX socket to set, ignoring: %m");
435 goto fail;
436 }
437 }
438
439 return;
440
441 fail:
442 unix_sockets = set_free_free(unix_sockets);
443 }
444
445 static bool unix_socket_alive(const char *fn) {
446 assert(fn);
447
448 load_unix_sockets();
449
450 if (unix_sockets)
451 return !!set_get(unix_sockets, (char*) fn);
452
453 /* We don't know, so assume yes */
454 return true;
455 }
456
457 static int dir_is_mount_point(DIR *d, const char *subdir) {
458
459 int mount_id_parent, mount_id;
460 int r_p, r;
461
462 r_p = name_to_handle_at_loop(dirfd(d), ".", NULL, &mount_id_parent, 0);
463 if (r_p < 0)
464 r_p = -errno;
465
466 r = name_to_handle_at_loop(dirfd(d), subdir, NULL, &mount_id, 0);
467 if (r < 0)
468 r = -errno;
469
470 /* got no handle; make no assumptions, return error */
471 if (r_p < 0 && r < 0)
472 return r_p;
473
474 /* got both handles; if they differ, it is a mount point */
475 if (r_p >= 0 && r >= 0)
476 return mount_id_parent != mount_id;
477
478 /* got only one handle; assume different mount points if one
479 * of both queries was not supported by the filesystem */
480 if (IN_SET(r_p, -ENOSYS, -EOPNOTSUPP) || IN_SET(r, -ENOSYS, -EOPNOTSUPP))
481 return true;
482
483 /* return error */
484 if (r_p < 0)
485 return r_p;
486 return r;
487 }
488
489 static DIR* xopendirat_nomod(int dirfd, const char *path) {
490 DIR *dir;
491
492 dir = xopendirat(dirfd, path, O_NOFOLLOW|O_NOATIME);
493 if (dir)
494 return dir;
495
496 log_debug_errno(errno, "Cannot open %sdirectory \"%s\": %m", dirfd == AT_FDCWD ? "" : "sub", path);
497 if (errno != EPERM)
498 return NULL;
499
500 dir = xopendirat(dirfd, path, O_NOFOLLOW);
501 if (!dir)
502 log_debug_errno(errno, "Cannot open %sdirectory \"%s\": %m", dirfd == AT_FDCWD ? "" : "sub", path);
503
504 return dir;
505 }
506
507 static DIR* opendir_nomod(const char *path) {
508 return xopendirat_nomod(AT_FDCWD, path);
509 }
510
511 static int dir_cleanup(
512 Item *i,
513 const char *p,
514 DIR *d,
515 const struct stat *ds,
516 usec_t cutoff,
517 dev_t rootdev,
518 bool mountpoint,
519 int maxdepth,
520 bool keep_this_level) {
521
522 struct dirent *dent;
523 struct timespec times[2];
524 bool deleted = false;
525 int r = 0;
526
527 FOREACH_DIRENT_ALL(dent, d, break) {
528 struct stat s;
529 usec_t age;
530 _cleanup_free_ char *sub_path = NULL;
531
532 if (dot_or_dot_dot(dent->d_name))
533 continue;
534
535 if (fstatat(dirfd(d), dent->d_name, &s, AT_SYMLINK_NOFOLLOW) < 0) {
536 if (errno == ENOENT)
537 continue;
538
539 /* FUSE, NFS mounts, SELinux might return EACCES */
540 r = log_full_errno(errno == EACCES ? LOG_DEBUG : LOG_ERR, errno,
541 "stat(%s/%s) failed: %m", p, dent->d_name);
542 continue;
543 }
544
545 /* Stay on the same filesystem */
546 if (s.st_dev != rootdev) {
547 log_debug("Ignoring \"%s/%s\": different filesystem.", p, dent->d_name);
548 continue;
549 }
550
551 /* Try to detect bind mounts of the same filesystem instance; they
552 * do not differ in device major/minors. This type of query is not
553 * supported on all kernels or filesystem types though. */
554 if (S_ISDIR(s.st_mode) && dir_is_mount_point(d, dent->d_name) > 0) {
555 log_debug("Ignoring \"%s/%s\": different mount of the same filesystem.",
556 p, dent->d_name);
557 continue;
558 }
559
560 sub_path = strjoin(p, "/", dent->d_name);
561 if (!sub_path) {
562 r = log_oom();
563 goto finish;
564 }
565
566 /* Is there an item configured for this path? */
567 if (ordered_hashmap_get(items, sub_path)) {
568 log_debug("Ignoring \"%s\": a separate entry exists.", sub_path);
569 continue;
570 }
571
572 if (find_glob(globs, sub_path)) {
573 log_debug("Ignoring \"%s\": a separate glob exists.", sub_path);
574 continue;
575 }
576
577 if (S_ISDIR(s.st_mode)) {
578
579 if (mountpoint &&
580 streq(dent->d_name, "lost+found") &&
581 s.st_uid == 0) {
582 log_debug("Ignoring \"%s\".", sub_path);
583 continue;
584 }
585
586 if (maxdepth <= 0)
587 log_warning("Reached max depth on \"%s\".", sub_path);
588 else {
589 _cleanup_closedir_ DIR *sub_dir;
590 int q;
591
592 sub_dir = xopendirat_nomod(dirfd(d), dent->d_name);
593 if (!sub_dir) {
594 if (errno != ENOENT)
595 r = log_error_errno(errno, "opendir(%s) failed: %m", sub_path);
596
597 continue;
598 }
599
600 q = dir_cleanup(i, sub_path, sub_dir, &s, cutoff, rootdev, false, maxdepth-1, false);
601 if (q < 0)
602 r = q;
603 }
604
605 /* Note: if you are wondering why we don't
606 * support the sticky bit for excluding
607 * directories from cleaning like we do it for
608 * other file system objects: well, the sticky
609 * bit already has a meaning for directories,
610 * so we don't want to overload that. */
611
612 if (keep_this_level) {
613 log_debug("Keeping \"%s\".", sub_path);
614 continue;
615 }
616
617 /* Ignore ctime, we change it when deleting */
618 age = timespec_load(&s.st_mtim);
619 if (age >= cutoff) {
620 char a[FORMAT_TIMESTAMP_MAX];
621 /* Follows spelling in stat(1). */
622 log_debug("Directory \"%s\": modify time %s is too new.",
623 sub_path,
624 format_timestamp_us(a, sizeof(a), age));
625 continue;
626 }
627
628 age = timespec_load(&s.st_atim);
629 if (age >= cutoff) {
630 char a[FORMAT_TIMESTAMP_MAX];
631 log_debug("Directory \"%s\": access time %s is too new.",
632 sub_path,
633 format_timestamp_us(a, sizeof(a), age));
634 continue;
635 }
636
637 log_debug("Removing directory \"%s\".", sub_path);
638 if (unlinkat(dirfd(d), dent->d_name, AT_REMOVEDIR) < 0)
639 if (!IN_SET(errno, ENOENT, ENOTEMPTY))
640 r = log_error_errno(errno, "rmdir(%s): %m", sub_path);
641
642 } else {
643 /* Skip files for which the sticky bit is
644 * set. These are semantics we define, and are
645 * unknown elsewhere. See XDG_RUNTIME_DIR
646 * specification for details. */
647 if (s.st_mode & S_ISVTX) {
648 log_debug("Skipping \"%s\": sticky bit set.", sub_path);
649 continue;
650 }
651
652 if (mountpoint && S_ISREG(s.st_mode))
653 if (s.st_uid == 0 && STR_IN_SET(dent->d_name,
654 ".journal",
655 "aquota.user",
656 "aquota.group")) {
657 log_debug("Skipping \"%s\".", sub_path);
658 continue;
659 }
660
661 /* Ignore sockets that are listed in /proc/net/unix */
662 if (S_ISSOCK(s.st_mode) && unix_socket_alive(sub_path)) {
663 log_debug("Skipping \"%s\": live socket.", sub_path);
664 continue;
665 }
666
667 /* Ignore device nodes */
668 if (S_ISCHR(s.st_mode) || S_ISBLK(s.st_mode)) {
669 log_debug("Skipping \"%s\": a device.", sub_path);
670 continue;
671 }
672
673 /* Keep files on this level around if this is
674 * requested */
675 if (keep_this_level) {
676 log_debug("Keeping \"%s\".", sub_path);
677 continue;
678 }
679
680 age = timespec_load(&s.st_mtim);
681 if (age >= cutoff) {
682 char a[FORMAT_TIMESTAMP_MAX];
683 /* Follows spelling in stat(1). */
684 log_debug("File \"%s\": modify time %s is too new.",
685 sub_path,
686 format_timestamp_us(a, sizeof(a), age));
687 continue;
688 }
689
690 age = timespec_load(&s.st_atim);
691 if (age >= cutoff) {
692 char a[FORMAT_TIMESTAMP_MAX];
693 log_debug("File \"%s\": access time %s is too new.",
694 sub_path,
695 format_timestamp_us(a, sizeof(a), age));
696 continue;
697 }
698
699 age = timespec_load(&s.st_ctim);
700 if (age >= cutoff) {
701 char a[FORMAT_TIMESTAMP_MAX];
702 log_debug("File \"%s\": change time %s is too new.",
703 sub_path,
704 format_timestamp_us(a, sizeof(a), age));
705 continue;
706 }
707
708 log_debug("unlink \"%s\"", sub_path);
709
710 if (unlinkat(dirfd(d), dent->d_name, 0) < 0)
711 if (errno != ENOENT)
712 r = log_error_errno(errno, "unlink(%s): %m", sub_path);
713
714 deleted = true;
715 }
716 }
717
718 finish:
719 if (deleted) {
720 usec_t age1, age2;
721 char a[FORMAT_TIMESTAMP_MAX], b[FORMAT_TIMESTAMP_MAX];
722
723 /* Restore original directory timestamps */
724 times[0] = ds->st_atim;
725 times[1] = ds->st_mtim;
726
727 age1 = timespec_load(&ds->st_atim);
728 age2 = timespec_load(&ds->st_mtim);
729 log_debug("Restoring access and modification time on \"%s\": %s, %s",
730 p,
731 format_timestamp_us(a, sizeof(a), age1),
732 format_timestamp_us(b, sizeof(b), age2));
733 if (futimens(dirfd(d), times) < 0)
734 log_error_errno(errno, "utimensat(%s): %m", p);
735 }
736
737 return r;
738 }
739
740 static bool dangerous_hardlinks(void) {
741 _cleanup_free_ char *value = NULL;
742 static int cached = -1;
743 int r;
744
745 /* Check whether the fs.protected_hardlinks sysctl is on. If we can't determine it we assume its off, as that's
746 * what the upstream default is. */
747
748 if (cached >= 0)
749 return cached;
750
751 r = read_one_line_file("/proc/sys/fs/protected_hardlinks", &value);
752 if (r < 0) {
753 log_debug_errno(r, "Failed to read fs.protected_hardlinks sysctl: %m");
754 return true;
755 }
756
757 r = parse_boolean(value);
758 if (r < 0) {
759 log_debug_errno(r, "Failed to parse fs.protected_hardlinks sysctl: %m");
760 return true;
761 }
762
763 cached = r == 0;
764 return cached;
765 }
766
767 static bool hardlink_vulnerable(const struct stat *st) {
768 assert(st);
769
770 return !S_ISDIR(st->st_mode) && st->st_nlink > 1 && dangerous_hardlinks();
771 }
772
773 static int fd_set_perms(Item *i, int fd, const char *path, const struct stat *st) {
774 struct stat stbuf;
775
776 assert(i);
777 assert(fd);
778 assert(path);
779
780 if (!i->mode_set && !i->uid_set && !i->gid_set)
781 goto shortcut;
782
783 if (!st) {
784 if (fstat(fd, &stbuf) < 0)
785 return log_error_errno(errno, "fstat(%s) failed: %m", path);
786 st = &stbuf;
787 }
788
789 if (hardlink_vulnerable(st)) {
790 log_error("Refusing to set permissions on hardlinked file %s while the fs.protected_hardlinks sysctl is turned off.", path);
791 return -EPERM;
792 }
793
794 if (i->mode_set) {
795 if (S_ISLNK(st->st_mode))
796 log_debug("Skipping mode fix for symlink %s.", path);
797 else {
798 mode_t m = i->mode;
799
800 if (i->mask_perms) {
801 if (!(st->st_mode & 0111))
802 m &= ~0111;
803 if (!(st->st_mode & 0222))
804 m &= ~0222;
805 if (!(st->st_mode & 0444))
806 m &= ~0444;
807 if (!S_ISDIR(st->st_mode))
808 m &= ~07000; /* remove sticky/sgid/suid bit, unless directory */
809 }
810
811 if (m == (st->st_mode & 07777))
812 log_debug("\"%s\" has correct mode %o already.", path, st->st_mode);
813 else {
814 log_debug("Changing \"%s\" to mode %o.", path, m);
815 if (fchmod_opath(fd, m) < 0)
816 return log_error_errno(errno, "fchmod() of %s failed: %m", path);
817 }
818 }
819 }
820
821 if ((i->uid_set && i->uid != st->st_uid) ||
822 (i->gid_set && i->gid != st->st_gid)) {
823 log_debug("Changing \"%s\" to owner "UID_FMT":"GID_FMT,
824 path,
825 i->uid_set ? i->uid : UID_INVALID,
826 i->gid_set ? i->gid : GID_INVALID);
827
828 if (fchownat(fd,
829 "",
830 i->uid_set ? i->uid : UID_INVALID,
831 i->gid_set ? i->gid : GID_INVALID,
832 AT_EMPTY_PATH) < 0)
833 return log_error_errno(errno, "fchownat() of %s failed: %m", path);
834 }
835
836 shortcut:
837 return label_fix(path, 0);
838 }
839
840 static int path_open_parent_safe(const char *path) {
841 _cleanup_free_ char *dn = NULL;
842 int fd;
843
844 if (path_equal(path, "/") || !path_is_normalized(path)) {
845 log_error("Failed to open parent of '%s': invalid path.", path);
846 return -EINVAL;
847 }
848
849 dn = dirname_malloc(path);
850 if (!dn)
851 return log_oom();
852
853 fd = chase_symlinks(dn, NULL, CHASE_OPEN|CHASE_SAFE, NULL);
854 if (fd == -EPERM)
855 return log_error_errno(fd, "Unsafe symlinks encountered in %s, refusing.", path);
856 if (fd < 0)
857 return log_error_errno(fd, "Failed to validate path %s: %m", path);
858
859 return fd;
860 }
861
862 static int path_open_safe(const char *path) {
863 int fd;
864
865 /* path_open_safe() returns a file descriptor opened with O_PATH after
866 * verifying that the path doesn't contain unsafe transitions, except
867 * for its final component as the function does not follow symlink. */
868
869 assert(path);
870
871 if (!path_is_normalized(path)) {
872 log_error("Failed to open invalid path '%s'.", path);
873 return -EINVAL;
874 }
875
876 fd = chase_symlinks(path, NULL, CHASE_OPEN|CHASE_SAFE|CHASE_NOFOLLOW, NULL);
877 if (fd == -EPERM)
878 return log_error_errno(fd, "Unsafe symlinks encountered in %s, refusing.", path);
879 if (fd < 0)
880 return log_error_errno(fd, "Failed to validate path %s: %m", path);
881
882 return fd;
883 }
884
885 static int path_set_perms(Item *i, const char *path) {
886 _cleanup_close_ int fd = -1;
887
888 assert(i);
889 assert(path);
890
891 fd = path_open_safe(path);
892 if (fd < 0)
893 return fd;
894
895 return fd_set_perms(i, fd, path, NULL);
896 }
897
898 static int parse_xattrs_from_arg(Item *i) {
899 const char *p;
900 int r;
901
902 assert(i);
903 assert(i->argument);
904
905 p = i->argument;
906
907 for (;;) {
908 _cleanup_free_ char *name = NULL, *value = NULL, *xattr = NULL;
909
910 r = extract_first_word(&p, &xattr, NULL, EXTRACT_QUOTES|EXTRACT_CUNESCAPE);
911 if (r < 0)
912 log_warning_errno(r, "Failed to parse extended attribute '%s', ignoring: %m", p);
913 if (r <= 0)
914 break;
915
916 r = split_pair(xattr, "=", &name, &value);
917 if (r < 0) {
918 log_warning_errno(r, "Failed to parse extended attribute, ignoring: %s", xattr);
919 continue;
920 }
921
922 if (isempty(name) || isempty(value)) {
923 log_warning("Malformed extended attribute found, ignoring: %s", xattr);
924 continue;
925 }
926
927 if (strv_push_pair(&i->xattrs, name, value) < 0)
928 return log_oom();
929
930 name = value = NULL;
931 }
932
933 return 0;
934 }
935
936 static int fd_set_xattrs(Item *i, int fd, const char *path, const struct stat *st) {
937 char procfs_path[STRLEN("/proc/self/fd/") + DECIMAL_STR_MAX(int)];
938 char **name, **value;
939
940 assert(i);
941 assert(fd);
942 assert(path);
943
944 xsprintf(procfs_path, "/proc/self/fd/%i", fd);
945
946 STRV_FOREACH_PAIR(name, value, i->xattrs) {
947 log_debug("Setting extended attribute '%s=%s' on %s.", *name, *value, path);
948 if (setxattr(procfs_path, *name, *value, strlen(*value), 0) < 0)
949 return log_error_errno(errno, "Setting extended attribute %s=%s on %s failed: %m",
950 *name, *value, path);
951 }
952 return 0;
953 }
954
955 static int path_set_xattrs(Item *i, const char *path) {
956 _cleanup_close_ int fd = -1;
957
958 assert(i);
959 assert(path);
960
961 fd = path_open_safe(path);
962 if (fd < 0)
963 return fd;
964
965 return fd_set_xattrs(i, fd, path, NULL);
966 }
967
968 static int parse_acls_from_arg(Item *item) {
969 #if HAVE_ACL
970 int r;
971
972 assert(item);
973
974 /* If force (= modify) is set, we will not modify the acl
975 * afterwards, so the mask can be added now if necessary. */
976
977 r = parse_acl(item->argument, &item->acl_access, &item->acl_default, !item->force);
978 if (r < 0)
979 log_warning_errno(r, "Failed to parse ACL \"%s\": %m. Ignoring", item->argument);
980 #else
981 log_warning_errno(ENOSYS, "ACLs are not supported. Ignoring");
982 #endif
983
984 return 0;
985 }
986
987 #if HAVE_ACL
988 static int path_set_acl(const char *path, const char *pretty, acl_type_t type, acl_t acl, bool modify) {
989 _cleanup_(acl_free_charpp) char *t = NULL;
990 _cleanup_(acl_freep) acl_t dup = NULL;
991 int r;
992
993 /* Returns 0 for success, positive error if already warned,
994 * negative error otherwise. */
995
996 if (modify) {
997 r = acls_for_file(path, type, acl, &dup);
998 if (r < 0)
999 return r;
1000
1001 r = calc_acl_mask_if_needed(&dup);
1002 if (r < 0)
1003 return r;
1004 } else {
1005 dup = acl_dup(acl);
1006 if (!dup)
1007 return -errno;
1008
1009 /* the mask was already added earlier if needed */
1010 }
1011
1012 r = add_base_acls_if_needed(&dup, path);
1013 if (r < 0)
1014 return r;
1015
1016 t = acl_to_any_text(dup, NULL, ',', TEXT_ABBREVIATE);
1017 log_debug("Setting %s ACL %s on %s.",
1018 type == ACL_TYPE_ACCESS ? "access" : "default",
1019 strna(t), pretty);
1020
1021 r = acl_set_file(path, type, dup);
1022 if (r < 0)
1023 /* Return positive to indicate we already warned */
1024 return -log_error_errno(errno,
1025 "Setting %s ACL \"%s\" on %s failed: %m",
1026 type == ACL_TYPE_ACCESS ? "access" : "default",
1027 strna(t), pretty);
1028
1029 return 0;
1030 }
1031 #endif
1032
1033 static int fd_set_acls(Item *item, int fd, const char *path, const struct stat *st) {
1034 int r = 0;
1035 #if HAVE_ACL
1036 char procfs_path[STRLEN("/proc/self/fd/") + DECIMAL_STR_MAX(int)];
1037 struct stat stbuf;
1038
1039 assert(item);
1040 assert(fd);
1041 assert(path);
1042
1043 if (!st) {
1044 if (fstat(fd, &stbuf) < 0)
1045 return log_error_errno(errno, "fstat(%s) failed: %m", path);
1046 st = &stbuf;
1047 }
1048
1049 if (hardlink_vulnerable(st)) {
1050 log_error("Refusing to set ACLs on hardlinked file %s while the fs.protected_hardlinks sysctl is turned off.", path);
1051 return -EPERM;
1052 }
1053
1054 if (S_ISLNK(st->st_mode)) {
1055 log_debug("Skipping ACL fix for symlink %s.", path);
1056 return 0;
1057 }
1058
1059 xsprintf(procfs_path, "/proc/self/fd/%i", fd);
1060
1061 if (item->acl_access)
1062 r = path_set_acl(procfs_path, path, ACL_TYPE_ACCESS, item->acl_access, item->force);
1063
1064 /* set only default acls to folders */
1065 if (r == 0 && item->acl_default && S_ISDIR(st->st_mode))
1066 r = path_set_acl(procfs_path, path, ACL_TYPE_DEFAULT, item->acl_default, item->force);
1067
1068 if (r > 0)
1069 return -r; /* already warned */
1070 if (r == -EOPNOTSUPP) {
1071 log_debug_errno(r, "ACLs not supported by file system at %s", path);
1072 return 0;
1073 }
1074 if (r < 0)
1075 return log_error_errno(r, "ACL operation on \"%s\" failed: %m", path);
1076 #endif
1077 return r;
1078 }
1079
1080 static int path_set_acls(Item *item, const char *path) {
1081 int r = 0;
1082 #if HAVE_ACL
1083 _cleanup_close_ int fd = -1;
1084
1085 assert(item);
1086 assert(path);
1087
1088 fd = path_open_safe(path);
1089 if (fd < 0)
1090 return fd;
1091
1092 r = fd_set_acls(item, fd, path, NULL);
1093 #endif
1094 return r;
1095 }
1096
1097 #define ATTRIBUTES_ALL \
1098 (FS_NOATIME_FL | \
1099 FS_SYNC_FL | \
1100 FS_DIRSYNC_FL | \
1101 FS_APPEND_FL | \
1102 FS_COMPR_FL | \
1103 FS_NODUMP_FL | \
1104 FS_EXTENT_FL | \
1105 FS_IMMUTABLE_FL | \
1106 FS_JOURNAL_DATA_FL | \
1107 FS_SECRM_FL | \
1108 FS_UNRM_FL | \
1109 FS_NOTAIL_FL | \
1110 FS_TOPDIR_FL | \
1111 FS_NOCOW_FL)
1112
1113 static int parse_attribute_from_arg(Item *item) {
1114
1115 static const struct {
1116 char character;
1117 unsigned value;
1118 } attributes[] = {
1119 { 'A', FS_NOATIME_FL }, /* do not update atime */
1120 { 'S', FS_SYNC_FL }, /* Synchronous updates */
1121 { 'D', FS_DIRSYNC_FL }, /* dirsync behaviour (directories only) */
1122 { 'a', FS_APPEND_FL }, /* writes to file may only append */
1123 { 'c', FS_COMPR_FL }, /* Compress file */
1124 { 'd', FS_NODUMP_FL }, /* do not dump file */
1125 { 'e', FS_EXTENT_FL }, /* Extents */
1126 { 'i', FS_IMMUTABLE_FL }, /* Immutable file */
1127 { 'j', FS_JOURNAL_DATA_FL }, /* Reserved for ext3 */
1128 { 's', FS_SECRM_FL }, /* Secure deletion */
1129 { 'u', FS_UNRM_FL }, /* Undelete */
1130 { 't', FS_NOTAIL_FL }, /* file tail should not be merged */
1131 { 'T', FS_TOPDIR_FL }, /* Top of directory hierarchies */
1132 { 'C', FS_NOCOW_FL }, /* Do not cow file */
1133 };
1134
1135 enum {
1136 MODE_ADD,
1137 MODE_DEL,
1138 MODE_SET
1139 } mode = MODE_ADD;
1140
1141 unsigned value = 0, mask = 0;
1142 const char *p;
1143
1144 assert(item);
1145
1146 p = item->argument;
1147 if (p) {
1148 if (*p == '+') {
1149 mode = MODE_ADD;
1150 p++;
1151 } else if (*p == '-') {
1152 mode = MODE_DEL;
1153 p++;
1154 } else if (*p == '=') {
1155 mode = MODE_SET;
1156 p++;
1157 }
1158 }
1159
1160 if (isempty(p) && mode != MODE_SET) {
1161 log_error("Setting file attribute on '%s' needs an attribute specification.", item->path);
1162 return -EINVAL;
1163 }
1164
1165 for (; p && *p ; p++) {
1166 unsigned i, v;
1167
1168 for (i = 0; i < ELEMENTSOF(attributes); i++)
1169 if (*p == attributes[i].character)
1170 break;
1171
1172 if (i >= ELEMENTSOF(attributes)) {
1173 log_error("Unknown file attribute '%c' on '%s'.", *p, item->path);
1174 return -EINVAL;
1175 }
1176
1177 v = attributes[i].value;
1178
1179 SET_FLAG(value, v, IN_SET(mode, MODE_ADD, MODE_SET));
1180
1181 mask |= v;
1182 }
1183
1184 if (mode == MODE_SET)
1185 mask |= ATTRIBUTES_ALL;
1186
1187 assert(mask != 0);
1188
1189 item->attribute_mask = mask;
1190 item->attribute_value = value;
1191 item->attribute_set = true;
1192
1193 return 0;
1194 }
1195
1196 static int fd_set_attribute(Item *item, int fd, const char *path, const struct stat *st) {
1197 _cleanup_close_ int procfs_fd = -1;
1198 struct stat stbuf;
1199 unsigned f;
1200 int r;
1201
1202 assert(item);
1203 assert(fd);
1204 assert(path);
1205
1206 if (!item->attribute_set || item->attribute_mask == 0)
1207 return 0;
1208
1209 if (!st) {
1210 if (fstat(fd, &stbuf) < 0)
1211 return log_error_errno(errno, "fstat(%s) failed: %m", path);
1212 st = &stbuf;
1213 }
1214
1215 /* Issuing the file attribute ioctls on device nodes is not
1216 * safe, as that will be delivered to the drivers, not the
1217 * file system containing the device node. */
1218 if (!S_ISREG(st->st_mode) && !S_ISDIR(st->st_mode)) {
1219 log_error("Setting file flags is only supported on regular files and directories, cannot set on '%s'.", path);
1220 return -EINVAL;
1221 }
1222
1223 f = item->attribute_value & item->attribute_mask;
1224
1225 /* Mask away directory-specific flags */
1226 if (!S_ISDIR(st->st_mode))
1227 f &= ~FS_DIRSYNC_FL;
1228
1229 procfs_fd = fd_reopen(fd, O_RDONLY|O_CLOEXEC|O_NOATIME);
1230 if (procfs_fd < 0)
1231 return log_error_errno(procfs_fd, "Failed to re-open '%s': %m", path);
1232
1233 r = chattr_fd(procfs_fd, f, item->attribute_mask);
1234 if (r < 0)
1235 log_full_errno(IN_SET(r, -ENOTTY, -EOPNOTSUPP) ? LOG_DEBUG : LOG_WARNING,
1236 r,
1237 "Cannot set file attribute for '%s', value=0x%08x, mask=0x%08x, ignoring: %m",
1238 path, item->attribute_value, item->attribute_mask);
1239
1240 return 0;
1241 }
1242
1243 static int path_set_attribute(Item *item, const char *path) {
1244 _cleanup_close_ int fd = -1;
1245
1246 if (!item->attribute_set || item->attribute_mask == 0)
1247 return 0;
1248
1249 fd = path_open_safe(path);
1250 if (fd < 0)
1251 return fd;
1252
1253 return fd_set_attribute(item, fd, path, NULL);
1254 }
1255
1256 static int write_one_file(Item *i, const char *path) {
1257 _cleanup_close_ int fd = -1, dir_fd = -1;
1258 char *bn;
1259 int r;
1260
1261 assert(i);
1262 assert(path);
1263 assert(i->argument);
1264 assert(i->type == WRITE_FILE);
1265
1266 /* Validate the path and keep the fd on the directory for opening the
1267 * file so we're sure that it can't be changed behind our back. */
1268 dir_fd = path_open_parent_safe(path);
1269 if (dir_fd < 0)
1270 return dir_fd;
1271
1272 bn = basename(path);
1273
1274 /* Follows symlinks */
1275 fd = openat(dir_fd, bn, O_NONBLOCK|O_CLOEXEC|O_WRONLY|O_NOCTTY, i->mode);
1276 if (fd < 0) {
1277 if (errno == ENOENT) {
1278 log_debug_errno(errno, "Not writing missing file \"%s\": %m", path);
1279 return 0;
1280 }
1281 return log_error_errno(errno, "Failed to open file \"%s\": %m", path);
1282 }
1283
1284 /* 'w' is allowed to write into any kind of files. */
1285 log_debug("Writing to \"%s\".", path);
1286
1287 r = loop_write(fd, i->argument, strlen(i->argument), false);
1288 if (r < 0)
1289 return log_error_errno(r, "Failed to write file \"%s\": %m", path);
1290
1291 return fd_set_perms(i, fd, path, NULL);
1292 }
1293
1294 static int create_file(Item *i, const char *path) {
1295 _cleanup_close_ int fd = -1, dir_fd = -1;
1296 struct stat stbuf, *st = NULL;
1297 int r = 0;
1298 char *bn;
1299
1300 assert(i);
1301 assert(path);
1302 assert(i->type == CREATE_FILE);
1303
1304 /* 'f' operates on regular files exclusively. */
1305
1306 /* Validate the path and keep the fd on the directory for opening the
1307 * file so we're sure that it can't be changed behind our back. */
1308 dir_fd = path_open_parent_safe(path);
1309 if (dir_fd < 0)
1310 return dir_fd;
1311
1312 bn = basename(path);
1313
1314 RUN_WITH_UMASK(0000) {
1315 mac_selinux_create_file_prepare(path, S_IFREG);
1316 fd = openat(dir_fd, bn, O_CREAT|O_EXCL|O_NOFOLLOW|O_NONBLOCK|O_CLOEXEC|O_WRONLY|O_NOCTTY, i->mode);
1317 mac_selinux_create_file_clear();
1318 }
1319
1320 if (fd < 0) {
1321 /* Even on a read-only filesystem, open(2) returns EEXIST if the
1322 * file already exists. It returns EROFS only if it needs to
1323 * create the file. */
1324 if (errno != EEXIST)
1325 return log_error_errno(errno, "Failed to create file %s: %m", path);
1326
1327 /* Re-open the file. At that point it must exist since open(2)
1328 * failed with EEXIST. We still need to check if the perms/mode
1329 * need to be changed. For read-only filesystems, we let
1330 * fd_set_perms() report the error if the perms need to be
1331 * modified. */
1332 fd = openat(dir_fd, bn, O_NOFOLLOW|O_CLOEXEC|O_PATH, i->mode);
1333 if (fd < 0)
1334 return log_error_errno(errno, "Failed to re-open file %s: %m", path);
1335
1336 if (fstat(fd, &stbuf) < 0)
1337 return log_error_errno(errno, "stat(%s) failed: %m", path);
1338
1339 if (!S_ISREG(stbuf.st_mode)) {
1340 log_error("%s exists and is not a regular file.", path);
1341 return -EEXIST;
1342 }
1343
1344 st = &stbuf;
1345 } else {
1346
1347 log_debug("\"%s\" has been created.", path);
1348
1349 if (i->argument) {
1350 log_debug("Writing to \"%s\".", path);
1351
1352 r = loop_write(fd, i->argument, strlen(i->argument), false);
1353 if (r < 0)
1354 return log_error_errno(r, "Failed to write file \"%s\": %m", path);
1355 }
1356 }
1357
1358 return fd_set_perms(i, fd, path, st);
1359 }
1360
1361 static int truncate_file(Item *i, const char *path) {
1362 _cleanup_close_ int fd = -1, dir_fd = -1;
1363 struct stat stbuf, *st = NULL;
1364 bool erofs = false;
1365 int r = 0;
1366 char *bn;
1367
1368 assert(i);
1369 assert(path);
1370 assert(i->type == TRUNCATE_FILE);
1371
1372 /* We want to operate on regular file exclusively especially since
1373 * O_TRUNC is unspecified if the file is neither a regular file nor a
1374 * fifo nor a terminal device. Therefore we first open the file and make
1375 * sure it's a regular one before truncating it. */
1376
1377 /* Validate the path and keep the fd on the directory for opening the
1378 * file so we're sure that it can't be changed behind our back. */
1379 dir_fd = path_open_parent_safe(path);
1380 if (dir_fd < 0)
1381 return dir_fd;
1382
1383 bn = basename(path);
1384
1385 RUN_WITH_UMASK(0000) {
1386 mac_selinux_create_file_prepare(path, S_IFREG);
1387 fd = openat(dir_fd, bn, O_CREAT|O_NOFOLLOW|O_NONBLOCK|O_CLOEXEC|O_WRONLY|O_NOCTTY, i->mode);
1388 mac_selinux_create_file_clear();
1389 }
1390
1391 if (fd < 0) {
1392 if (errno != EROFS)
1393 return log_error_errno(errno, "Failed to open/create file %s: %m", path);
1394
1395 /* On a read-only filesystem, we don't want to fail if the
1396 * target is already empty and the perms are set. So we still
1397 * proceed with the sanity checks and let the remaining
1398 * operations fail with EROFS if they try to modify the target
1399 * file. */
1400
1401 fd = openat(dir_fd, bn, O_NOFOLLOW|O_CLOEXEC|O_PATH, i->mode);
1402 if (fd < 0) {
1403 if (errno == ENOENT) {
1404 log_error("Cannot create file %s on a read-only file system.", path);
1405 return -EROFS;
1406 }
1407
1408 return log_error_errno(errno, "Failed to re-open file %s: %m", path);
1409 }
1410
1411 erofs = true;
1412 }
1413
1414 if (fstat(fd, &stbuf) < 0)
1415 return log_error_errno(errno, "stat(%s) failed: %m", path);
1416
1417 if (!S_ISREG(stbuf.st_mode)) {
1418 log_error("%s exists and is not a regular file.", path);
1419 return -EEXIST;
1420 }
1421
1422 if (stbuf.st_size > 0) {
1423 if (ftruncate(fd, 0) < 0) {
1424 r = erofs ? -EROFS : -errno;
1425 return log_error_errno(r, "Failed to truncate file %s: %m", path);
1426 }
1427 } else
1428 st = &stbuf;
1429
1430 log_debug("\"%s\" has been created.", path);
1431
1432 if (i->argument) {
1433 log_debug("Writing to \"%s\".", path);
1434
1435 r = loop_write(fd, i->argument, strlen(i->argument), false);
1436 if (r < 0) {
1437 r = erofs ? -EROFS : r;
1438 return log_error_errno(r, "Failed to write file %s: %m", path);
1439 }
1440 }
1441
1442 return fd_set_perms(i, fd, path, st);
1443 }
1444
1445 static int copy_files(Item *i) {
1446 _cleanup_close_ int dfd = -1, fd = -1;
1447 char *bn;
1448 int r;
1449
1450 log_debug("Copying tree \"%s\" to \"%s\".", i->argument, i->path);
1451
1452 bn = basename(i->path);
1453
1454 /* Validate the path and use the returned directory fd for copying the
1455 * target so we're sure that the path can't be changed behind our
1456 * back. */
1457 dfd = path_open_parent_safe(i->path);
1458 if (dfd < 0)
1459 return dfd;
1460
1461 r = copy_tree_at(AT_FDCWD, i->argument,
1462 dfd, bn,
1463 i->uid_set ? i->uid : UID_INVALID,
1464 i->gid_set ? i->gid : GID_INVALID,
1465 COPY_REFLINK);
1466 if (r < 0) {
1467 struct stat a, b;
1468
1469 /* If the target already exists on read-only filesystems, trying
1470 * to create the target will not fail with EEXIST but with
1471 * EROFS. */
1472 if (r == -EROFS && faccessat(dfd, bn, F_OK, AT_SYMLINK_NOFOLLOW) == 0)
1473 r = -EEXIST;
1474
1475 if (r != -EEXIST)
1476 return log_error_errno(r, "Failed to copy files to %s: %m", i->path);
1477
1478 if (stat(i->argument, &a) < 0)
1479 return log_error_errno(errno, "stat(%s) failed: %m", i->argument);
1480
1481 if (fstatat(dfd, bn, &b, AT_SYMLINK_NOFOLLOW) < 0)
1482 return log_error_errno(errno, "stat(%s) failed: %m", i->path);
1483
1484 if ((a.st_mode ^ b.st_mode) & S_IFMT) {
1485 log_debug("Can't copy to %s, file exists already and is of different type", i->path);
1486 return 0;
1487 }
1488 }
1489
1490 fd = openat(dfd, bn, O_NOFOLLOW|O_CLOEXEC|O_PATH);
1491 if (fd < 0)
1492 return log_error_errno(errno, "Failed to openat(%s): %m", i->path);
1493
1494 return fd_set_perms(i, fd, i->path, NULL);
1495 }
1496
1497 typedef enum {
1498 CREATION_NORMAL,
1499 CREATION_EXISTING,
1500 CREATION_FORCE,
1501 _CREATION_MODE_MAX,
1502 _CREATION_MODE_INVALID = -1
1503 } CreationMode;
1504
1505 static const char *creation_mode_verb_table[_CREATION_MODE_MAX] = {
1506 [CREATION_NORMAL] = "Created",
1507 [CREATION_EXISTING] = "Found existing",
1508 [CREATION_FORCE] = "Created replacement",
1509 };
1510
1511 DEFINE_PRIVATE_STRING_TABLE_LOOKUP_TO_STRING(creation_mode_verb, CreationMode);
1512
1513 static int create_directory_or_subvolume(const char *path, mode_t mode, bool subvol, CreationMode *creation) {
1514 _cleanup_close_ int pfd = -1;
1515 CreationMode c;
1516 int r;
1517
1518 assert(path);
1519
1520 if (!creation)
1521 creation = &c;
1522
1523 pfd = path_open_parent_safe(path);
1524 if (pfd < 0)
1525 return pfd;
1526
1527 if (subvol) {
1528 if (btrfs_is_subvol(empty_to_root(arg_root)) <= 0)
1529
1530 /* Don't create a subvolume unless the root directory is
1531 * one, too. We do this under the assumption that if the
1532 * root directory is just a plain directory (i.e. very
1533 * light-weight), we shouldn't try to split it up into
1534 * subvolumes (i.e. more heavy-weight). Thus, chroot()
1535 * environments and suchlike will get a full brtfs
1536 * subvolume set up below their tree only if they
1537 * specifically set up a btrfs subvolume for the root
1538 * dir too. */
1539
1540 subvol = false;
1541 else {
1542 RUN_WITH_UMASK((~mode) & 0777)
1543 r = btrfs_subvol_make_fd(pfd, basename(path));
1544 }
1545 } else
1546 r = 0;
1547
1548 if (!subvol || r == -ENOTTY)
1549 RUN_WITH_UMASK(0000)
1550 r = mkdirat_label(pfd, basename(path), mode);
1551
1552 if (r < 0) {
1553 int k;
1554
1555 if (!IN_SET(r, -EEXIST, -EROFS))
1556 return log_error_errno(r, "Failed to create directory or subvolume \"%s\": %m", path);
1557
1558 k = is_dir_fd(pfd);
1559 if (k == -ENOENT && r == -EROFS)
1560 return log_error_errno(r, "%s does not exist and cannot be created as the file system is read-only.", path);
1561 if (k < 0)
1562 return log_error_errno(k, "Failed to check if %s exists: %m", path);
1563 if (!k) {
1564 log_warning("\"%s\" already exists and is not a directory.", path);
1565 return -EEXIST;
1566 }
1567
1568 *creation = CREATION_EXISTING;
1569 } else
1570 *creation = CREATION_NORMAL;
1571
1572 log_debug("%s directory \"%s\".", creation_mode_verb_to_string(*creation), path);
1573
1574 r = openat(pfd, basename(path), O_NOCTTY|O_CLOEXEC|O_DIRECTORY);
1575 if (r < 0)
1576 return log_error_errno(errno, "Failed to open directory '%s': %m", basename(path));
1577
1578 return r;
1579 }
1580
1581 static int create_directory(Item *i, const char *path) {
1582 _cleanup_close_ int fd = -1;
1583
1584 assert(i);
1585 assert(IN_SET(i->type, CREATE_DIRECTORY, TRUNCATE_DIRECTORY));
1586
1587 fd = create_directory_or_subvolume(path, i->mode, false, NULL);
1588 if (fd == -EEXIST)
1589 return 0;
1590 if (fd < 0)
1591 return fd;
1592
1593 return fd_set_perms(i, fd, path, NULL);
1594 }
1595
1596 static int create_subvolume(Item *i, const char *path) {
1597 _cleanup_close_ int fd = -1;
1598 CreationMode creation;
1599 int r, q = 0;
1600
1601 assert(i);
1602 assert(IN_SET(i->type, CREATE_SUBVOLUME, CREATE_SUBVOLUME_NEW_QUOTA, CREATE_SUBVOLUME_INHERIT_QUOTA));
1603
1604 fd = create_directory_or_subvolume(path, i->mode, true, &creation);
1605 if (fd == -EEXIST)
1606 return 0;
1607 if (fd < 0)
1608 return fd;
1609
1610 if (creation == CREATION_NORMAL &&
1611 IN_SET(i->type, CREATE_SUBVOLUME_NEW_QUOTA, CREATE_SUBVOLUME_INHERIT_QUOTA)) {
1612 r = btrfs_subvol_auto_qgroup_fd(fd, 0, i->type == CREATE_SUBVOLUME_NEW_QUOTA);
1613 if (r == -ENOTTY)
1614 log_debug_errno(r, "Couldn't adjust quota for subvolume \"%s\" (unsupported fs or dir not a subvolume): %m", i->path);
1615 else if (r == -EROFS)
1616 log_debug_errno(r, "Couldn't adjust quota for subvolume \"%s\" (fs is read-only).", i->path);
1617 else if (r == -ENOPROTOOPT)
1618 log_debug_errno(r, "Couldn't adjust quota for subvolume \"%s\" (quota support is disabled).", i->path);
1619 else if (r < 0)
1620 q = log_error_errno(r, "Failed to adjust quota for subvolume \"%s\": %m", i->path);
1621 else if (r > 0)
1622 log_debug("Adjusted quota for subvolume \"%s\".", i->path);
1623 else if (r == 0)
1624 log_debug("Quota for subvolume \"%s\" already in place, no change made.", i->path);
1625 }
1626
1627 r = fd_set_perms(i, fd, path, NULL);
1628 if (q < 0) /* prefer the quota change error from above */
1629 return q;
1630
1631 return r;
1632 }
1633
1634 static int empty_directory(Item *i, const char *path) {
1635 int r;
1636
1637 assert(i);
1638 assert(i->type == EMPTY_DIRECTORY);
1639
1640 r = is_dir(path, false);
1641 if (r == -ENOENT) {
1642 /* Option "e" operates only on existing objects. Do not
1643 * print errors about non-existent files or directories */
1644 log_debug("Skipping missing directory: %s", path);
1645 return 0;
1646 }
1647 if (r < 0)
1648 return log_error_errno(r, "is_dir() failed on path %s: %m", path);
1649 if (r == 0) {
1650 log_error("'%s' already exists and is not a directory.", path);
1651 return -EEXIST;
1652 }
1653
1654 return path_set_perms(i, path);
1655 }
1656
1657 static int create_device(Item *i, mode_t file_type) {
1658 _cleanup_close_ int dfd = -1, fd = -1;
1659 CreationMode creation;
1660 char *bn;
1661 int r;
1662
1663 assert(i);
1664 assert(IN_SET(file_type, S_IFBLK, S_IFCHR));
1665
1666 bn = basename(i->path);
1667
1668 /* Validate the path and use the returned directory fd for copying the
1669 * target so we're sure that the path can't be changed behind our
1670 * back. */
1671 dfd = path_open_parent_safe(i->path);
1672 if (dfd < 0)
1673 return dfd;
1674
1675 RUN_WITH_UMASK(0000) {
1676 mac_selinux_create_file_prepare(i->path, file_type);
1677 r = mknodat(dfd, bn, i->mode | file_type, i->major_minor);
1678 mac_selinux_create_file_clear();
1679 }
1680
1681 if (r < 0) {
1682 struct stat st;
1683
1684 if (errno == EPERM) {
1685 log_debug("We lack permissions, possibly because of cgroup configuration; "
1686 "skipping creation of device node %s.", i->path);
1687 return 0;
1688 }
1689
1690 if (errno != EEXIST)
1691 return log_error_errno(errno, "Failed to create device node %s: %m", i->path);
1692
1693 if (fstatat(dfd, bn, &st, 0) < 0)
1694 return log_error_errno(errno, "stat(%s) failed: %m", i->path);
1695
1696 if ((st.st_mode & S_IFMT) != file_type) {
1697
1698 if (i->force) {
1699
1700 RUN_WITH_UMASK(0000) {
1701 mac_selinux_create_file_prepare(i->path, file_type);
1702 /* FIXME: need to introduce mknodat_atomic() */
1703 r = mknod_atomic(i->path, i->mode | file_type, i->major_minor);
1704 mac_selinux_create_file_clear();
1705 }
1706
1707 if (r < 0)
1708 return log_error_errno(r, "Failed to create device node \"%s\": %m", i->path);
1709 creation = CREATION_FORCE;
1710 } else {
1711 log_debug("%s is not a device node.", i->path);
1712 return 0;
1713 }
1714 } else
1715 creation = CREATION_EXISTING;
1716 } else
1717 creation = CREATION_NORMAL;
1718
1719 log_debug("%s %s device node \"%s\" %u:%u.",
1720 creation_mode_verb_to_string(creation),
1721 i->type == CREATE_BLOCK_DEVICE ? "block" : "char",
1722 i->path, major(i->mode), minor(i->mode));
1723
1724 fd = openat(dfd, bn, O_NOFOLLOW|O_CLOEXEC|O_PATH);
1725 if (fd < 0)
1726 return log_error_errno(errno, "Failed to openat(%s): %m", i->path);
1727
1728 return fd_set_perms(i, fd, i->path, NULL);
1729 }
1730
1731 static int create_fifo(Item *i, const char *path) {
1732 _cleanup_close_ int pfd = -1, fd = -1;
1733 CreationMode creation;
1734 struct stat st;
1735 char *bn;
1736 int r;
1737
1738 pfd = path_open_parent_safe(path);
1739 if (pfd < 0)
1740 return pfd;
1741
1742 bn = basename(path);
1743
1744 RUN_WITH_UMASK(0000) {
1745 mac_selinux_create_file_prepare(path, S_IFIFO);
1746 r = mkfifoat(pfd, bn, i->mode);
1747 mac_selinux_create_file_clear();
1748 }
1749
1750 if (r < 0) {
1751 if (errno != EEXIST)
1752 return log_error_errno(errno, "Failed to create fifo %s: %m", path);
1753
1754 if (fstatat(pfd, bn, &st, AT_SYMLINK_NOFOLLOW) < 0)
1755 return log_error_errno(errno, "stat(%s) failed: %m", path);
1756
1757 if (!S_ISFIFO(st.st_mode)) {
1758
1759 if (i->force) {
1760 RUN_WITH_UMASK(0000) {
1761 mac_selinux_create_file_prepare(path, S_IFIFO);
1762 r = mkfifoat_atomic(pfd, bn, i->mode);
1763 mac_selinux_create_file_clear();
1764 }
1765
1766 if (r < 0)
1767 return log_error_errno(r, "Failed to create fifo %s: %m", path);
1768 creation = CREATION_FORCE;
1769 } else {
1770 log_warning("\"%s\" already exists and is not a fifo.", path);
1771 return 0;
1772 }
1773 } else
1774 creation = CREATION_EXISTING;
1775 } else
1776 creation = CREATION_NORMAL;
1777
1778 log_debug("%s fifo \"%s\".", creation_mode_verb_to_string(creation), path);
1779
1780 fd = openat(pfd, bn, O_NOFOLLOW|O_CLOEXEC|O_PATH);
1781 if (fd < 0)
1782 return log_error_errno(errno, "Failed to openat(%s): %m", path);
1783
1784 return fd_set_perms(i, fd, i->path, NULL);
1785 }
1786
1787 typedef int (*action_t)(Item *i, const char *path);
1788 typedef int (*fdaction_t)(Item *i, int fd, const char *path, const struct stat *st);
1789
1790 static int item_do(Item *i, int fd, const char *path, fdaction_t action) {
1791 struct stat st;
1792 int r = 0, q;
1793
1794 assert(i);
1795 assert(path);
1796 assert(fd >= 0);
1797
1798 if (fstat(fd, &st) < 0) {
1799 r = log_error_errno(errno, "fstat() on file failed: %m");
1800 goto finish;
1801 }
1802
1803 /* This returns the first error we run into, but nevertheless
1804 * tries to go on */
1805 r = action(i, fd, path, &st);
1806
1807 if (S_ISDIR(st.st_mode)) {
1808 char procfs_path[STRLEN("/proc/self/fd/") + DECIMAL_STR_MAX(int)];
1809 _cleanup_closedir_ DIR *d = NULL;
1810 struct dirent *de;
1811
1812 /* The passed 'fd' was opened with O_PATH. We need to convert
1813 * it into a 'regular' fd before reading the directory content. */
1814 xsprintf(procfs_path, "/proc/self/fd/%i", fd);
1815
1816 d = opendir(procfs_path);
1817 if (!d) {
1818 log_error_errno(errno, "Failed to opendir() '%s': %m", procfs_path);
1819 if (r == 0)
1820 r = -errno;
1821 goto finish;
1822 }
1823
1824 FOREACH_DIRENT_ALL(de, d, q = -errno; goto finish) {
1825 int de_fd;
1826
1827 if (dot_or_dot_dot(de->d_name))
1828 continue;
1829
1830 de_fd = openat(fd, de->d_name, O_NOFOLLOW|O_CLOEXEC|O_PATH);
1831 if (de_fd < 0)
1832 q = log_error_errno(errno, "Failed to open() file '%s': %m", de->d_name);
1833 else {
1834 _cleanup_free_ char *de_path = NULL;
1835
1836 de_path = path_join(NULL, path, de->d_name);
1837 if (!de_path)
1838 q = log_oom();
1839 else
1840 /* Pass ownership of dirent fd over */
1841 q = item_do(i, de_fd, de_path, action);
1842 }
1843
1844 if (q < 0 && r == 0)
1845 r = q;
1846 }
1847 }
1848 finish:
1849 safe_close(fd);
1850 return r;
1851 }
1852
1853 static int glob_item(Item *i, action_t action) {
1854 _cleanup_globfree_ glob_t g = {
1855 .gl_opendir = (void *(*)(const char *)) opendir_nomod,
1856 };
1857 int r = 0, k;
1858 char **fn;
1859
1860 k = safe_glob(i->path, GLOB_NOSORT|GLOB_BRACE, &g);
1861 if (k < 0 && k != -ENOENT)
1862 return log_error_errno(k, "glob(%s) failed: %m", i->path);
1863
1864 STRV_FOREACH(fn, g.gl_pathv) {
1865 k = action(i, *fn);
1866 if (k < 0 && r == 0)
1867 r = k;
1868 }
1869
1870 return r;
1871 }
1872
1873 static int glob_item_recursively(Item *i, fdaction_t action) {
1874 _cleanup_globfree_ glob_t g = {
1875 .gl_opendir = (void *(*)(const char *)) opendir_nomod,
1876 };
1877 int r = 0, k;
1878 char **fn;
1879
1880 k = safe_glob(i->path, GLOB_NOSORT|GLOB_BRACE, &g);
1881 if (k < 0 && k != -ENOENT)
1882 return log_error_errno(k, "glob(%s) failed: %m", i->path);
1883
1884 STRV_FOREACH(fn, g.gl_pathv) {
1885 _cleanup_close_ int fd = -1;
1886
1887 /* Make sure we won't trigger/follow file object (such as
1888 * device nodes, automounts, ...) pointed out by 'fn' with
1889 * O_PATH. Note, when O_PATH is used, flags other than
1890 * O_CLOEXEC, O_DIRECTORY, and O_NOFOLLOW are ignored. */
1891
1892 fd = open(*fn, O_CLOEXEC|O_NOFOLLOW|O_PATH);
1893 if (fd < 0) {
1894 log_error_errno(errno, "Opening '%s' failed: %m", *fn);
1895 if (r == 0)
1896 r = -errno;
1897 continue;
1898 }
1899
1900 k = item_do(i, fd, *fn, action);
1901 if (k < 0 && r == 0)
1902 r = k;
1903
1904 /* we passed fd ownership to the previous call */
1905 fd = -1;
1906 }
1907
1908 return r;
1909 }
1910
1911 static int create_item(Item *i) {
1912 CreationMode creation;
1913 int r = 0;
1914
1915 assert(i);
1916
1917 log_debug("Running create action for entry %c %s", (char) i->type, i->path);
1918
1919 switch (i->type) {
1920
1921 case IGNORE_PATH:
1922 case IGNORE_DIRECTORY_PATH:
1923 case REMOVE_PATH:
1924 case RECURSIVE_REMOVE_PATH:
1925 return 0;
1926
1927 case CREATE_FILE:
1928 RUN_WITH_UMASK(0000)
1929 (void) mkdir_parents_label(i->path, 0755);
1930
1931 r = create_file(i, i->path);
1932 if (r < 0)
1933 return r;
1934 break;
1935
1936 case TRUNCATE_FILE:
1937 RUN_WITH_UMASK(0000)
1938 (void) mkdir_parents_label(i->path, 0755);
1939
1940 r = truncate_file(i, i->path);
1941 if (r < 0)
1942 return r;
1943 break;
1944
1945 case COPY_FILES:
1946 RUN_WITH_UMASK(0000)
1947 (void) mkdir_parents_label(i->path, 0755);
1948
1949 r = copy_files(i);
1950 if (r < 0)
1951 return r;
1952 break;
1953
1954 case WRITE_FILE:
1955 r = glob_item(i, write_one_file);
1956 if (r < 0)
1957 return r;
1958
1959 break;
1960
1961 case CREATE_DIRECTORY:
1962 case TRUNCATE_DIRECTORY:
1963 RUN_WITH_UMASK(0000)
1964 (void) mkdir_parents_label(i->path, 0755);
1965
1966 r = create_directory(i, i->path);
1967 if (r < 0)
1968 return r;
1969 break;
1970
1971 case CREATE_SUBVOLUME:
1972 case CREATE_SUBVOLUME_INHERIT_QUOTA:
1973 case CREATE_SUBVOLUME_NEW_QUOTA:
1974 RUN_WITH_UMASK(0000)
1975 (void) mkdir_parents_label(i->path, 0755);
1976
1977 r = create_subvolume(i, i->path);
1978 if (r < 0)
1979 return r;
1980 break;
1981
1982 case EMPTY_DIRECTORY:
1983 r = glob_item(i, empty_directory);
1984 if (r < 0)
1985 return r;
1986 break;
1987
1988 case CREATE_FIFO:
1989 RUN_WITH_UMASK(0000)
1990 (void) mkdir_parents_label(i->path, 0755);
1991
1992 r = create_fifo(i, i->path);
1993 if (r < 0)
1994 return r;
1995 break;
1996
1997 case CREATE_SYMLINK: {
1998 RUN_WITH_UMASK(0000)
1999 (void) mkdir_parents_label(i->path, 0755);
2000
2001 mac_selinux_create_file_prepare(i->path, S_IFLNK);
2002 r = symlink(i->argument, i->path);
2003 mac_selinux_create_file_clear();
2004
2005 if (r < 0) {
2006 _cleanup_free_ char *x = NULL;
2007
2008 if (errno != EEXIST)
2009 return log_error_errno(errno, "symlink(%s, %s) failed: %m", i->argument, i->path);
2010
2011 r = readlink_malloc(i->path, &x);
2012 if (r < 0 || !streq(i->argument, x)) {
2013
2014 if (i->force) {
2015 mac_selinux_create_file_prepare(i->path, S_IFLNK);
2016 r = symlink_atomic(i->argument, i->path);
2017 mac_selinux_create_file_clear();
2018
2019 if (IN_SET(r, -EISDIR, -EEXIST, -ENOTEMPTY)) {
2020 r = rm_rf(i->path, REMOVE_ROOT|REMOVE_PHYSICAL);
2021 if (r < 0)
2022 return log_error_errno(r, "rm -fr %s failed: %m", i->path);
2023
2024 mac_selinux_create_file_prepare(i->path, S_IFLNK);
2025 r = symlink(i->argument, i->path) < 0 ? -errno : 0;
2026 mac_selinux_create_file_clear();
2027 }
2028 if (r < 0)
2029 return log_error_errno(r, "symlink(%s, %s) failed: %m", i->argument, i->path);
2030
2031 creation = CREATION_FORCE;
2032 } else {
2033 log_debug("\"%s\" is not a symlink or does not point to the correct path.", i->path);
2034 return 0;
2035 }
2036 } else
2037 creation = CREATION_EXISTING;
2038 } else
2039
2040 creation = CREATION_NORMAL;
2041 log_debug("%s symlink \"%s\".", creation_mode_verb_to_string(creation), i->path);
2042 break;
2043 }
2044
2045 case CREATE_BLOCK_DEVICE:
2046 case CREATE_CHAR_DEVICE:
2047 if (have_effective_cap(CAP_MKNOD) == 0) {
2048 /* In a container we lack CAP_MKNOD. We shouldn't attempt to create the device node in that
2049 * case to avoid noise, and we don't support virtualized devices in containers anyway. */
2050
2051 log_debug("We lack CAP_MKNOD, skipping creation of device node %s.", i->path);
2052 return 0;
2053 }
2054
2055 RUN_WITH_UMASK(0000)
2056 (void) mkdir_parents_label(i->path, 0755);
2057
2058 r = create_device(i, i->type == CREATE_BLOCK_DEVICE ? S_IFBLK : S_IFCHR);
2059 if (r < 0)
2060 return r;
2061
2062 break;
2063
2064 case ADJUST_MODE:
2065 case RELABEL_PATH:
2066 r = glob_item(i, path_set_perms);
2067 if (r < 0)
2068 return r;
2069 break;
2070
2071 case RECURSIVE_RELABEL_PATH:
2072 r = glob_item_recursively(i, fd_set_perms);
2073 if (r < 0)
2074 return r;
2075 break;
2076
2077 case SET_XATTR:
2078 r = glob_item(i, path_set_xattrs);
2079 if (r < 0)
2080 return r;
2081 break;
2082
2083 case RECURSIVE_SET_XATTR:
2084 r = glob_item_recursively(i, fd_set_xattrs);
2085 if (r < 0)
2086 return r;
2087 break;
2088
2089 case SET_ACL:
2090 r = glob_item(i, path_set_acls);
2091 if (r < 0)
2092 return r;
2093 break;
2094
2095 case RECURSIVE_SET_ACL:
2096 r = glob_item_recursively(i, fd_set_acls);
2097 if (r < 0)
2098 return r;
2099 break;
2100
2101 case SET_ATTRIBUTE:
2102 r = glob_item(i, path_set_attribute);
2103 if (r < 0)
2104 return r;
2105 break;
2106
2107 case RECURSIVE_SET_ATTRIBUTE:
2108 r = glob_item_recursively(i, fd_set_attribute);
2109 if (r < 0)
2110 return r;
2111 break;
2112 }
2113
2114 return 0;
2115 }
2116
2117 static int remove_item_instance(Item *i, const char *instance) {
2118 int r;
2119
2120 assert(i);
2121
2122 switch (i->type) {
2123
2124 case REMOVE_PATH:
2125 if (remove(instance) < 0 && errno != ENOENT)
2126 return log_error_errno(errno, "rm(%s): %m", instance);
2127
2128 break;
2129
2130 case TRUNCATE_DIRECTORY:
2131 case RECURSIVE_REMOVE_PATH:
2132 /* FIXME: we probably should use dir_cleanup() here
2133 * instead of rm_rf() so that 'x' is honoured. */
2134 log_debug("rm -rf \"%s\"", instance);
2135 r = rm_rf(instance, (i->type == RECURSIVE_REMOVE_PATH ? REMOVE_ROOT|REMOVE_SUBVOLUME : 0) | REMOVE_PHYSICAL);
2136 if (r < 0 && r != -ENOENT)
2137 return log_error_errno(r, "rm_rf(%s): %m", instance);
2138
2139 break;
2140
2141 default:
2142 assert_not_reached("wut?");
2143 }
2144
2145 return 0;
2146 }
2147
2148 static int remove_item(Item *i) {
2149 assert(i);
2150
2151 log_debug("Running remove action for entry %c %s", (char) i->type, i->path);
2152
2153 switch (i->type) {
2154
2155 case REMOVE_PATH:
2156 case TRUNCATE_DIRECTORY:
2157 case RECURSIVE_REMOVE_PATH:
2158 return glob_item(i, remove_item_instance);
2159
2160 default:
2161 return 0;
2162 }
2163 }
2164
2165 static int clean_item_instance(Item *i, const char* instance) {
2166 _cleanup_closedir_ DIR *d = NULL;
2167 struct stat s, ps;
2168 bool mountpoint;
2169 usec_t cutoff, n;
2170 char timestamp[FORMAT_TIMESTAMP_MAX];
2171
2172 assert(i);
2173
2174 if (!i->age_set)
2175 return 0;
2176
2177 n = now(CLOCK_REALTIME);
2178 if (n < i->age)
2179 return 0;
2180
2181 cutoff = n - i->age;
2182
2183 d = opendir_nomod(instance);
2184 if (!d) {
2185 if (IN_SET(errno, ENOENT, ENOTDIR)) {
2186 log_debug_errno(errno, "Directory \"%s\": %m", instance);
2187 return 0;
2188 }
2189
2190 return log_error_errno(errno, "Failed to open directory %s: %m", instance);
2191 }
2192
2193 if (fstat(dirfd(d), &s) < 0)
2194 return log_error_errno(errno, "stat(%s) failed: %m", i->path);
2195
2196 if (!S_ISDIR(s.st_mode)) {
2197 log_error("%s is not a directory.", i->path);
2198 return -ENOTDIR;
2199 }
2200
2201 if (fstatat(dirfd(d), "..", &ps, AT_SYMLINK_NOFOLLOW) != 0)
2202 return log_error_errno(errno, "stat(%s/..) failed: %m", i->path);
2203
2204 mountpoint = s.st_dev != ps.st_dev || s.st_ino == ps.st_ino;
2205
2206 log_debug("Cleanup threshold for %s \"%s\" is %s",
2207 mountpoint ? "mount point" : "directory",
2208 instance,
2209 format_timestamp_us(timestamp, sizeof(timestamp), cutoff));
2210
2211 return dir_cleanup(i, instance, d, &s, cutoff, s.st_dev, mountpoint,
2212 MAX_DEPTH, i->keep_first_level);
2213 }
2214
2215 static int clean_item(Item *i) {
2216 assert(i);
2217
2218 log_debug("Running clean action for entry %c %s", (char) i->type, i->path);
2219
2220 switch (i->type) {
2221 case CREATE_DIRECTORY:
2222 case CREATE_SUBVOLUME:
2223 case CREATE_SUBVOLUME_INHERIT_QUOTA:
2224 case CREATE_SUBVOLUME_NEW_QUOTA:
2225 case TRUNCATE_DIRECTORY:
2226 case IGNORE_PATH:
2227 case COPY_FILES:
2228 clean_item_instance(i, i->path);
2229 return 0;
2230 case EMPTY_DIRECTORY:
2231 case IGNORE_DIRECTORY_PATH:
2232 return glob_item(i, clean_item_instance);
2233 default:
2234 return 0;
2235 }
2236 }
2237
2238 static int process_item_array(ItemArray *array);
2239
2240 static int process_item(Item *i) {
2241 int r, q, p, t = 0;
2242 _cleanup_free_ char *prefix = NULL;
2243
2244 assert(i);
2245
2246 if (i->done)
2247 return 0;
2248
2249 i->done = true;
2250
2251 prefix = malloc(strlen(i->path) + 1);
2252 if (!prefix)
2253 return log_oom();
2254
2255 PATH_FOREACH_PREFIX(prefix, i->path) {
2256 ItemArray *j;
2257
2258 j = ordered_hashmap_get(items, prefix);
2259 if (j) {
2260 int s;
2261
2262 s = process_item_array(j);
2263 if (s < 0 && t == 0)
2264 t = s;
2265 }
2266 }
2267
2268 if (chase_symlinks(i->path, NULL, CHASE_NO_AUTOFS, NULL) == -EREMOTE)
2269 return t;
2270
2271 r = arg_create ? create_item(i) : 0;
2272 q = arg_remove ? remove_item(i) : 0;
2273 p = arg_clean ? clean_item(i) : 0;
2274
2275 return t < 0 ? t :
2276 r < 0 ? r :
2277 q < 0 ? q :
2278 p;
2279 }
2280
2281 static int process_item_array(ItemArray *array) {
2282 unsigned n;
2283 int r = 0, k;
2284
2285 assert(array);
2286
2287 for (n = 0; n < array->count; n++) {
2288 k = process_item(array->items + n);
2289 if (k < 0 && r == 0)
2290 r = k;
2291 }
2292
2293 return r;
2294 }
2295
2296 static void item_free_contents(Item *i) {
2297 assert(i);
2298 free(i->path);
2299 free(i->argument);
2300 strv_free(i->xattrs);
2301
2302 #if HAVE_ACL
2303 acl_free(i->acl_access);
2304 acl_free(i->acl_default);
2305 #endif
2306 }
2307
2308 static void item_array_free(ItemArray *a) {
2309 unsigned n;
2310
2311 if (!a)
2312 return;
2313
2314 for (n = 0; n < a->count; n++)
2315 item_free_contents(a->items + n);
2316 free(a->items);
2317 free(a);
2318 }
2319
2320 static int item_compare(const void *a, const void *b) {
2321 const Item *x = a, *y = b;
2322
2323 /* Make sure that the ownership taking item is put first, so
2324 * that we first create the node, and then can adjust it */
2325
2326 if (takes_ownership(x->type) && !takes_ownership(y->type))
2327 return -1;
2328 if (!takes_ownership(x->type) && takes_ownership(y->type))
2329 return 1;
2330
2331 return (int) x->type - (int) y->type;
2332 }
2333
2334 static bool item_compatible(Item *a, Item *b) {
2335 assert(a);
2336 assert(b);
2337 assert(streq(a->path, b->path));
2338
2339 if (takes_ownership(a->type) && takes_ownership(b->type))
2340 /* check if the items are the same */
2341 return streq_ptr(a->argument, b->argument) &&
2342
2343 a->uid_set == b->uid_set &&
2344 a->uid == b->uid &&
2345
2346 a->gid_set == b->gid_set &&
2347 a->gid == b->gid &&
2348
2349 a->mode_set == b->mode_set &&
2350 a->mode == b->mode &&
2351
2352 a->age_set == b->age_set &&
2353 a->age == b->age &&
2354
2355 a->mask_perms == b->mask_perms &&
2356
2357 a->keep_first_level == b->keep_first_level &&
2358
2359 a->major_minor == b->major_minor;
2360
2361 return true;
2362 }
2363
2364 static bool should_include_path(const char *path) {
2365 char **prefix;
2366
2367 STRV_FOREACH(prefix, arg_exclude_prefixes)
2368 if (path_startswith(path, *prefix)) {
2369 log_debug("Entry \"%s\" matches exclude prefix \"%s\", skipping.",
2370 path, *prefix);
2371 return false;
2372 }
2373
2374 STRV_FOREACH(prefix, arg_include_prefixes)
2375 if (path_startswith(path, *prefix)) {
2376 log_debug("Entry \"%s\" matches include prefix \"%s\".", path, *prefix);
2377 return true;
2378 }
2379
2380 /* no matches, so we should include this path only if we
2381 * have no whitelist at all */
2382 if (strv_isempty(arg_include_prefixes))
2383 return true;
2384
2385 log_debug("Entry \"%s\" does not match any include prefix, skipping.", path);
2386 return false;
2387 }
2388
2389 static int specifier_expansion_from_arg(Item *i) {
2390 _cleanup_free_ char *unescaped = NULL, *resolved = NULL;
2391 char **xattr;
2392 int r;
2393
2394 assert(i);
2395
2396 if (i->argument == NULL)
2397 return 0;
2398
2399 switch (i->type) {
2400 case COPY_FILES:
2401 case CREATE_SYMLINK:
2402 case CREATE_FILE:
2403 case TRUNCATE_FILE:
2404 case WRITE_FILE:
2405 r = cunescape(i->argument, 0, &unescaped);
2406 if (r < 0)
2407 return log_error_errno(r, "Failed to unescape parameter to write: %s", i->argument);
2408
2409 r = specifier_printf(unescaped, specifier_table, NULL, &resolved);
2410 if (r < 0)
2411 return r;
2412
2413 free_and_replace(i->argument, resolved);
2414 break;
2415
2416 case SET_XATTR:
2417 case RECURSIVE_SET_XATTR:
2418 assert(i->xattrs);
2419
2420 STRV_FOREACH (xattr, i->xattrs) {
2421 r = specifier_printf(*xattr, specifier_table, NULL, &resolved);
2422 if (r < 0)
2423 return r;
2424
2425 free_and_replace(*xattr, resolved);
2426 }
2427 break;
2428
2429 default:
2430 break;
2431 }
2432 return 0;
2433 }
2434
2435 static int patch_var_run(const char *fname, unsigned line, char **path) {
2436 const char *k;
2437 char *n;
2438
2439 assert(path);
2440 assert(*path);
2441
2442 /* Optionally rewrites lines referencing /var/run/, to use /run/ instead. Why bother? tmpfiles merges lines in
2443 * some cases and detects conflicts in others. If files/directories are specified through two equivalent lines
2444 * this is problematic as neither case will be detected. Ideally we'd detect these cases by resolving symlinks
2445 * early, but that's precisely not what we can do here as this code very likely is running very early on, at a
2446 * time where the paths in question are not available yet, or even more importantly, our own tmpfiles rules
2447 * might create the paths that are intermediary to the listed paths. We can't really cover the generic case,
2448 * but the least we can do is cover the specific case of /var/run vs. /run, as /var/run is a legacy name for
2449 * /run only, and we explicitly document that and require that on systemd systems the former is a symlink to
2450 * the latter. Moreover files below this path are by far the primary usecase for tmpfiles.d/. */
2451
2452 k = path_startswith(*path, "/var/run/");
2453 if (isempty(k)) /* Don't complain about other paths than /var/run, and not about /var/run itself either. */
2454 return 0;
2455
2456 n = strjoin("/run/", k);
2457 if (!n)
2458 return log_oom();
2459
2460 /* Also log about this briefly. We do so at LOG_NOTICE level, as we fixed up the situation automatically, hence
2461 * there's no immediate need for action by the user. However, in the interest of making things less confusing
2462 * to the user, let's still inform the user that these snippets should really be updated. */
2463
2464 log_notice("[%s:%u] Line references path below legacy directory /var/run/, updating %s → %s; please update the tmpfiles.d/ drop-in file accordingly.", fname, line, *path, n);
2465
2466 free(*path);
2467 *path = n;
2468
2469 return 0;
2470 }
2471
2472 static int parse_line(const char *fname, unsigned line, const char *buffer, bool *invalid_config) {
2473
2474 _cleanup_free_ char *action = NULL, *mode = NULL, *user = NULL, *group = NULL, *age = NULL, *path = NULL;
2475 _cleanup_(item_free_contents) Item i = {};
2476 ItemArray *existing;
2477 OrderedHashmap *h;
2478 int r, pos;
2479 bool force = false, boot = false;
2480
2481 assert(fname);
2482 assert(line >= 1);
2483 assert(buffer);
2484
2485 r = extract_many_words(
2486 &buffer,
2487 NULL,
2488 EXTRACT_QUOTES,
2489 &action,
2490 &path,
2491 &mode,
2492 &user,
2493 &group,
2494 &age,
2495 NULL);
2496 if (r < 0) {
2497 if (IN_SET(r, -EINVAL, -EBADSLT))
2498 /* invalid quoting and such or an unknown specifier */
2499 *invalid_config = true;
2500 return log_error_errno(r, "[%s:%u] Failed to parse line: %m", fname, line);
2501 } else if (r < 2) {
2502 *invalid_config = true;
2503 log_error("[%s:%u] Syntax error.", fname, line);
2504 return -EIO;
2505 }
2506
2507 if (!isempty(buffer) && !streq(buffer, "-")) {
2508 i.argument = strdup(buffer);
2509 if (!i.argument)
2510 return log_oom();
2511 }
2512
2513 if (isempty(action)) {
2514 *invalid_config = true;
2515 log_error("[%s:%u] Command too short '%s'.", fname, line, action);
2516 return -EINVAL;
2517 }
2518
2519 for (pos = 1; action[pos]; pos++) {
2520 if (action[pos] == '!' && !boot)
2521 boot = true;
2522 else if (action[pos] == '+' && !force)
2523 force = true;
2524 else {
2525 *invalid_config = true;
2526 log_error("[%s:%u] Unknown modifiers in command '%s'",
2527 fname, line, action);
2528 return -EINVAL;
2529 }
2530 }
2531
2532 if (boot && !arg_boot) {
2533 log_debug("Ignoring entry %s \"%s\" because --boot is not specified.",
2534 action, path);
2535 return 0;
2536 }
2537
2538 i.type = action[0];
2539 i.force = force;
2540
2541 r = specifier_printf(path, specifier_table, NULL, &i.path);
2542 if (r == -ENXIO)
2543 return log_unresolvable_specifier(fname, line);
2544 if (r < 0) {
2545 if (IN_SET(r, -EINVAL, -EBADSLT))
2546 *invalid_config = true;
2547 return log_error_errno(r, "[%s:%u] Failed to replace specifiers: %s", fname, line, path);
2548 }
2549
2550 r = patch_var_run(fname, line, &i.path);
2551 if (r < 0)
2552 return r;
2553
2554 switch (i.type) {
2555
2556 case CREATE_DIRECTORY:
2557 case CREATE_SUBVOLUME:
2558 case CREATE_SUBVOLUME_INHERIT_QUOTA:
2559 case CREATE_SUBVOLUME_NEW_QUOTA:
2560 case EMPTY_DIRECTORY:
2561 case TRUNCATE_DIRECTORY:
2562 case CREATE_FIFO:
2563 case IGNORE_PATH:
2564 case IGNORE_DIRECTORY_PATH:
2565 case REMOVE_PATH:
2566 case RECURSIVE_REMOVE_PATH:
2567 case ADJUST_MODE:
2568 case RELABEL_PATH:
2569 case RECURSIVE_RELABEL_PATH:
2570 if (i.argument)
2571 log_warning("[%s:%u] %c lines don't take argument fields, ignoring.", fname, line, i.type);
2572
2573 break;
2574
2575 case CREATE_FILE:
2576 case TRUNCATE_FILE:
2577 break;
2578
2579 case CREATE_SYMLINK:
2580 if (!i.argument) {
2581 i.argument = strappend("/usr/share/factory/", i.path);
2582 if (!i.argument)
2583 return log_oom();
2584 }
2585 break;
2586
2587 case WRITE_FILE:
2588 if (!i.argument) {
2589 *invalid_config = true;
2590 log_error("[%s:%u] Write file requires argument.", fname, line);
2591 return -EBADMSG;
2592 }
2593 break;
2594
2595 case COPY_FILES:
2596 if (!i.argument) {
2597 i.argument = strappend("/usr/share/factory/", i.path);
2598 if (!i.argument)
2599 return log_oom();
2600 } else if (!path_is_absolute(i.argument)) {
2601 *invalid_config = true;
2602 log_error("[%s:%u] Source path is not absolute.", fname, line);
2603 return -EBADMSG;
2604 }
2605
2606 path_simplify(i.argument, false);
2607 break;
2608
2609 case CREATE_CHAR_DEVICE:
2610 case CREATE_BLOCK_DEVICE: {
2611 unsigned major, minor;
2612
2613 if (!i.argument) {
2614 *invalid_config = true;
2615 log_error("[%s:%u] Device file requires argument.", fname, line);
2616 return -EBADMSG;
2617 }
2618
2619 if (sscanf(i.argument, "%u:%u", &major, &minor) != 2) {
2620 *invalid_config = true;
2621 log_error("[%s:%u] Can't parse device file major/minor '%s'.", fname, line, i.argument);
2622 return -EBADMSG;
2623 }
2624
2625 i.major_minor = makedev(major, minor);
2626 break;
2627 }
2628
2629 case SET_XATTR:
2630 case RECURSIVE_SET_XATTR:
2631 if (!i.argument) {
2632 *invalid_config = true;
2633 log_error("[%s:%u] Set extended attribute requires argument.", fname, line);
2634 return -EBADMSG;
2635 }
2636 r = parse_xattrs_from_arg(&i);
2637 if (r < 0)
2638 return r;
2639 break;
2640
2641 case SET_ACL:
2642 case RECURSIVE_SET_ACL:
2643 if (!i.argument) {
2644 *invalid_config = true;
2645 log_error("[%s:%u] Set ACLs requires argument.", fname, line);
2646 return -EBADMSG;
2647 }
2648 r = parse_acls_from_arg(&i);
2649 if (r < 0)
2650 return r;
2651 break;
2652
2653 case SET_ATTRIBUTE:
2654 case RECURSIVE_SET_ATTRIBUTE:
2655 if (!i.argument) {
2656 *invalid_config = true;
2657 log_error("[%s:%u] Set file attribute requires argument.", fname, line);
2658 return -EBADMSG;
2659 }
2660 r = parse_attribute_from_arg(&i);
2661 if (IN_SET(r, -EINVAL, -EBADSLT))
2662 *invalid_config = true;
2663 if (r < 0)
2664 return r;
2665 break;
2666
2667 default:
2668 log_error("[%s:%u] Unknown command type '%c'.", fname, line, (char) i.type);
2669 *invalid_config = true;
2670 return -EBADMSG;
2671 }
2672
2673 if (!path_is_absolute(i.path)) {
2674 log_error("[%s:%u] Path '%s' not absolute.", fname, line, i.path);
2675 *invalid_config = true;
2676 return -EBADMSG;
2677 }
2678
2679 path_simplify(i.path, false);
2680
2681 if (!should_include_path(i.path))
2682 return 0;
2683
2684 r = specifier_expansion_from_arg(&i);
2685 if (r == -ENXIO)
2686 return log_unresolvable_specifier(fname, line);
2687 if (r < 0) {
2688 if (IN_SET(r, -EINVAL, -EBADSLT))
2689 *invalid_config = true;
2690 return log_error_errno(r, "[%s:%u] Failed to substitute specifiers in argument: %m",
2691 fname, line);
2692 }
2693
2694 if (arg_root) {
2695 char *p;
2696
2697 p = prefix_root(arg_root, i.path);
2698 if (!p)
2699 return log_oom();
2700
2701 free(i.path);
2702 i.path = p;
2703 }
2704
2705 if (!isempty(user) && !streq(user, "-")) {
2706 const char *u = user;
2707
2708 r = get_user_creds(&u, &i.uid, NULL, NULL, NULL, USER_CREDS_ALLOW_MISSING);
2709 if (r < 0) {
2710 *invalid_config = true;
2711 return log_error_errno(r, "[%s:%u] Unknown user '%s'.", fname, line, user);
2712 }
2713
2714 i.uid_set = true;
2715 }
2716
2717 if (!isempty(group) && !streq(group, "-")) {
2718 const char *g = group;
2719
2720 r = get_group_creds(&g, &i.gid, USER_CREDS_ALLOW_MISSING);
2721 if (r < 0) {
2722 *invalid_config = true;
2723 log_error("[%s:%u] Unknown group '%s'.", fname, line, group);
2724 return r;
2725 }
2726
2727 i.gid_set = true;
2728 }
2729
2730 if (!isempty(mode) && !streq(mode, "-")) {
2731 const char *mm = mode;
2732 unsigned m;
2733
2734 if (*mm == '~') {
2735 i.mask_perms = true;
2736 mm++;
2737 }
2738
2739 if (parse_mode(mm, &m) < 0) {
2740 *invalid_config = true;
2741 log_error("[%s:%u] Invalid mode '%s'.", fname, line, mode);
2742 return -EBADMSG;
2743 }
2744
2745 i.mode = m;
2746 i.mode_set = true;
2747 } else
2748 i.mode = IN_SET(i.type, CREATE_DIRECTORY, TRUNCATE_DIRECTORY, CREATE_SUBVOLUME, CREATE_SUBVOLUME_INHERIT_QUOTA, CREATE_SUBVOLUME_NEW_QUOTA) ? 0755 : 0644;
2749
2750 if (!isempty(age) && !streq(age, "-")) {
2751 const char *a = age;
2752
2753 if (*a == '~') {
2754 i.keep_first_level = true;
2755 a++;
2756 }
2757
2758 if (parse_sec(a, &i.age) < 0) {
2759 *invalid_config = true;
2760 log_error("[%s:%u] Invalid age '%s'.", fname, line, age);
2761 return -EBADMSG;
2762 }
2763
2764 i.age_set = true;
2765 }
2766
2767 h = needs_glob(i.type) ? globs : items;
2768
2769 existing = ordered_hashmap_get(h, i.path);
2770 if (existing) {
2771 unsigned n;
2772
2773 for (n = 0; n < existing->count; n++) {
2774 if (!item_compatible(existing->items + n, &i)) {
2775 log_notice("[%s:%u] Duplicate line for path \"%s\", ignoring.",
2776 fname, line, i.path);
2777 return 0;
2778 }
2779 }
2780 } else {
2781 existing = new0(ItemArray, 1);
2782 if (!existing)
2783 return log_oom();
2784
2785 r = ordered_hashmap_put(h, i.path, existing);
2786 if (r < 0)
2787 return log_oom();
2788 }
2789
2790 if (!GREEDY_REALLOC(existing->items, existing->size, existing->count + 1))
2791 return log_oom();
2792
2793 memcpy(existing->items + existing->count++, &i, sizeof(i));
2794
2795 /* Sort item array, to enforce stable ordering of application */
2796 qsort_safe(existing->items, existing->count, sizeof(Item), item_compare);
2797
2798 zero(i);
2799 return 0;
2800 }
2801
2802 static int cat_config(char **config_dirs, char **args) {
2803 _cleanup_strv_free_ char **files = NULL;
2804 int r;
2805
2806 r = conf_files_list_with_replacement(arg_root, config_dirs, arg_replace, &files, NULL);
2807 if (r < 0)
2808 return r;
2809
2810 return cat_files(NULL, files, 0);
2811 }
2812
2813 static int help(void) {
2814 _cleanup_free_ char *link = NULL;
2815 int r;
2816
2817 r = terminal_urlify_man("systemd-tmpfiles", "8", &link);
2818 if (r < 0)
2819 return log_oom();
2820
2821 printf("%s [OPTIONS...] [CONFIGURATION FILE...]\n\n"
2822 "Creates, deletes and cleans up volatile and temporary files and directories.\n\n"
2823 " -h --help Show this help\n"
2824 " --user Execute user configuration\n"
2825 " --version Show package version\n"
2826 " --cat-config Show configuration files\n"
2827 " --create Create marked files/directories\n"
2828 " --clean Clean up marked directories\n"
2829 " --remove Remove marked files/directories\n"
2830 " --boot Execute actions only safe at boot\n"
2831 " --prefix=PATH Only apply rules with the specified prefix\n"
2832 " --exclude-prefix=PATH Ignore rules with the specified prefix\n"
2833 " --root=PATH Operate on an alternate filesystem root\n"
2834 " --replace=PATH Treat arguments as replacement for PATH\n"
2835 " --no-pager Do not pipe output into a pager\n"
2836 "\nSee the %s for details.\n"
2837 , program_invocation_short_name
2838 , link
2839 );
2840
2841 return 0;
2842 }
2843
2844 static int parse_argv(int argc, char *argv[]) {
2845
2846 enum {
2847 ARG_VERSION = 0x100,
2848 ARG_CAT_CONFIG,
2849 ARG_USER,
2850 ARG_CREATE,
2851 ARG_CLEAN,
2852 ARG_REMOVE,
2853 ARG_BOOT,
2854 ARG_PREFIX,
2855 ARG_EXCLUDE_PREFIX,
2856 ARG_ROOT,
2857 ARG_REPLACE,
2858 ARG_NO_PAGER,
2859 };
2860
2861 static const struct option options[] = {
2862 { "help", no_argument, NULL, 'h' },
2863 { "user", no_argument, NULL, ARG_USER },
2864 { "version", no_argument, NULL, ARG_VERSION },
2865 { "cat-config", no_argument, NULL, ARG_CAT_CONFIG },
2866 { "create", no_argument, NULL, ARG_CREATE },
2867 { "clean", no_argument, NULL, ARG_CLEAN },
2868 { "remove", no_argument, NULL, ARG_REMOVE },
2869 { "boot", no_argument, NULL, ARG_BOOT },
2870 { "prefix", required_argument, NULL, ARG_PREFIX },
2871 { "exclude-prefix", required_argument, NULL, ARG_EXCLUDE_PREFIX },
2872 { "root", required_argument, NULL, ARG_ROOT },
2873 { "replace", required_argument, NULL, ARG_REPLACE },
2874 { "no-pager", no_argument, NULL, ARG_NO_PAGER },
2875 {}
2876 };
2877
2878 int c, r;
2879
2880 assert(argc >= 0);
2881 assert(argv);
2882
2883 while ((c = getopt_long(argc, argv, "h", options, NULL)) >= 0)
2884
2885 switch (c) {
2886
2887 case 'h':
2888 return help();
2889
2890 case ARG_VERSION:
2891 return version();
2892
2893 case ARG_CAT_CONFIG:
2894 arg_cat_config = true;
2895 break;
2896
2897 case ARG_USER:
2898 arg_user = true;
2899 break;
2900
2901 case ARG_CREATE:
2902 arg_create = true;
2903 break;
2904
2905 case ARG_CLEAN:
2906 arg_clean = true;
2907 break;
2908
2909 case ARG_REMOVE:
2910 arg_remove = true;
2911 break;
2912
2913 case ARG_BOOT:
2914 arg_boot = true;
2915 break;
2916
2917 case ARG_PREFIX:
2918 if (strv_push(&arg_include_prefixes, optarg) < 0)
2919 return log_oom();
2920 break;
2921
2922 case ARG_EXCLUDE_PREFIX:
2923 if (strv_push(&arg_exclude_prefixes, optarg) < 0)
2924 return log_oom();
2925 break;
2926
2927 case ARG_ROOT:
2928 r = parse_path_argument_and_warn(optarg, true, &arg_root);
2929 if (r < 0)
2930 return r;
2931 break;
2932
2933 case ARG_REPLACE:
2934 if (!path_is_absolute(optarg) ||
2935 !endswith(optarg, ".conf")) {
2936 log_error("The argument to --replace= must an absolute path to a config file");
2937 return -EINVAL;
2938 }
2939
2940 arg_replace = optarg;
2941 break;
2942
2943 case ARG_NO_PAGER:
2944 arg_no_pager = true;
2945 break;
2946
2947 case '?':
2948 return -EINVAL;
2949
2950 default:
2951 assert_not_reached("Unhandled option");
2952 }
2953
2954 if (!arg_clean && !arg_create && !arg_remove && !arg_cat_config) {
2955 log_error("You need to specify at least one of --clean, --create or --remove.");
2956 return -EINVAL;
2957 }
2958
2959 if (arg_replace && arg_cat_config) {
2960 log_error("Option --replace= is not supported with --cat-config");
2961 return -EINVAL;
2962 }
2963
2964 if (arg_replace && optind >= argc) {
2965 log_error("When --replace= is given, some configuration items must be specified");
2966 return -EINVAL;
2967 }
2968
2969 return 1;
2970 }
2971
2972 static int read_config_file(char **config_dirs, const char *fn, bool ignore_enoent, bool *invalid_config) {
2973 _cleanup_fclose_ FILE *_f = NULL;
2974 FILE *f;
2975 char line[LINE_MAX];
2976 Iterator iterator;
2977 unsigned v = 0;
2978 Item *i;
2979 int r = 0;
2980
2981 assert(fn);
2982
2983 if (streq(fn, "-")) {
2984 log_debug("Reading config from stdin…");
2985 fn = "<stdin>";
2986 f = stdin;
2987 } else {
2988 r = search_and_fopen(fn, "re", arg_root, (const char**) config_dirs, &_f);
2989 if (r < 0) {
2990 if (ignore_enoent && r == -ENOENT) {
2991 log_debug_errno(r, "Failed to open \"%s\", ignoring: %m", fn);
2992 return 0;
2993 }
2994
2995 return log_error_errno(r, "Failed to open '%s': %m", fn);
2996 }
2997 log_debug("Reading config file \"%s\"…", fn);
2998 f = _f;
2999 }
3000
3001 FOREACH_LINE(line, f, break) {
3002 char *l;
3003 int k;
3004 bool invalid_line = false;
3005
3006 v++;
3007
3008 l = strstrip(line);
3009 if (IN_SET(*l, 0, '#'))
3010 continue;
3011
3012 k = parse_line(fn, v, l, &invalid_line);
3013 if (k < 0) {
3014 if (invalid_line)
3015 /* Allow reporting with a special code if the caller requested this */
3016 *invalid_config = true;
3017 else if (r == 0)
3018 /* The first error becomes our return value */
3019 r = k;
3020 }
3021 }
3022
3023 /* we have to determine age parameter for each entry of type X */
3024 ORDERED_HASHMAP_FOREACH(i, globs, iterator) {
3025 Iterator iter;
3026 Item *j, *candidate_item = NULL;
3027
3028 if (i->type != IGNORE_DIRECTORY_PATH)
3029 continue;
3030
3031 ORDERED_HASHMAP_FOREACH(j, items, iter) {
3032 if (!IN_SET(j->type, CREATE_DIRECTORY, TRUNCATE_DIRECTORY, CREATE_SUBVOLUME, CREATE_SUBVOLUME_INHERIT_QUOTA, CREATE_SUBVOLUME_NEW_QUOTA))
3033 continue;
3034
3035 if (path_equal(j->path, i->path)) {
3036 candidate_item = j;
3037 break;
3038 }
3039
3040 if ((!candidate_item && path_startswith(i->path, j->path)) ||
3041 (candidate_item && path_startswith(j->path, candidate_item->path) && (fnmatch(i->path, j->path, FNM_PATHNAME | FNM_PERIOD) == 0)))
3042 candidate_item = j;
3043 }
3044
3045 if (candidate_item && candidate_item->age_set) {
3046 i->age = candidate_item->age;
3047 i->age_set = true;
3048 }
3049 }
3050
3051 if (ferror(f)) {
3052 log_error_errno(errno, "Failed to read from file %s: %m", fn);
3053 if (r == 0)
3054 r = -EIO;
3055 }
3056
3057 return r;
3058 }
3059
3060 static int parse_arguments(char **config_dirs, char **args, bool *invalid_config) {
3061 char **arg;
3062 int r;
3063
3064 STRV_FOREACH(arg, args) {
3065 r = read_config_file(config_dirs, *arg, false, invalid_config);
3066 if (r < 0)
3067 return r;
3068 }
3069
3070 return 0;
3071 }
3072
3073 static int read_config_files(char **config_dirs, char **args, bool *invalid_config) {
3074 _cleanup_strv_free_ char **files = NULL;
3075 _cleanup_free_ char *p = NULL;
3076 char **f;
3077 int r;
3078
3079 r = conf_files_list_with_replacement(arg_root, config_dirs, arg_replace, &files, &p);
3080 if (r < 0)
3081 return r;
3082
3083 STRV_FOREACH(f, files)
3084 if (p && path_equal(*f, p)) {
3085 log_debug("Parsing arguments at position \"%s\"…", *f);
3086
3087 r = parse_arguments(config_dirs, args, invalid_config);
3088 if (r < 0)
3089 return r;
3090 } else
3091 /* Just warn, ignore result otherwise.
3092 * read_config_file() has some debug output, so no need to print anything. */
3093 (void) read_config_file(config_dirs, *f, true, invalid_config);
3094
3095 return 0;
3096 }
3097
3098 int main(int argc, char *argv[]) {
3099 int r, k, r_process = 0;
3100 ItemArray *a;
3101 Iterator iterator;
3102 _cleanup_strv_free_ char **config_dirs = NULL;
3103 bool invalid_config = false;
3104
3105 r = parse_argv(argc, argv);
3106 if (r <= 0)
3107 goto finish;
3108
3109 log_set_target(LOG_TARGET_AUTO);
3110 log_parse_environment();
3111 log_open();
3112
3113 if (arg_user) {
3114 r = user_config_paths(&config_dirs);
3115 if (r < 0) {
3116 log_error_errno(r, "Failed to initialize configuration directory list: %m");
3117 goto finish;
3118 }
3119 } else {
3120 config_dirs = strv_split_nulstr(CONF_PATHS_NULSTR("tmpfiles.d"));
3121 if (!config_dirs) {
3122 r = log_oom();
3123 goto finish;
3124 }
3125 }
3126
3127 if (DEBUG_LOGGING) {
3128 _cleanup_free_ char *t = NULL;
3129
3130 t = strv_join(config_dirs, "\n\t");
3131 if (t)
3132 log_debug("Looking for configuration files in (higher priority first):\n\t%s", t);
3133 }
3134
3135 if (arg_cat_config) {
3136 (void) pager_open(arg_no_pager, false);
3137
3138 r = cat_config(config_dirs, argv + optind);
3139 goto finish;
3140 }
3141
3142 umask(0022);
3143
3144 mac_selinux_init();
3145
3146 items = ordered_hashmap_new(&string_hash_ops);
3147 globs = ordered_hashmap_new(&string_hash_ops);
3148
3149 if (!items || !globs) {
3150 r = log_oom();
3151 goto finish;
3152 }
3153
3154 /* If command line arguments are specified along with --replace, read all
3155 * configuration files and insert the positional arguments at the specified
3156 * place. Otherwise, if command line arguments are specified, execute just
3157 * them, and finally, without --replace= or any positional arguments, just
3158 * read configuration and execute it.
3159 */
3160 if (arg_replace || optind >= argc)
3161 r = read_config_files(config_dirs, argv + optind, &invalid_config);
3162 else
3163 r = parse_arguments(config_dirs, argv + optind, &invalid_config);
3164 if (r < 0)
3165 goto finish;
3166
3167 /* The non-globbing ones usually create things, hence we apply
3168 * them first */
3169 ORDERED_HASHMAP_FOREACH(a, items, iterator) {
3170 k = process_item_array(a);
3171 if (k < 0 && r_process == 0)
3172 r_process = k;
3173 }
3174
3175 /* The globbing ones usually alter things, hence we apply them
3176 * second. */
3177 ORDERED_HASHMAP_FOREACH(a, globs, iterator) {
3178 k = process_item_array(a);
3179 if (k < 0 && r_process == 0)
3180 r_process = k;
3181 }
3182
3183 finish:
3184 pager_close();
3185
3186 ordered_hashmap_free_with_destructor(items, item_array_free);
3187 ordered_hashmap_free_with_destructor(globs, item_array_free);
3188
3189 free(arg_include_prefixes);
3190 free(arg_exclude_prefixes);
3191 free(arg_root);
3192
3193 set_free_free(unix_sockets);
3194
3195 mac_selinux_finish();
3196
3197 if (r < 0 || ERRNO_IS_RESOURCE(-r_process))
3198 return EXIT_FAILURE;
3199 else if (invalid_config)
3200 return EX_DATAERR;
3201 else if (r_process < 0)
3202 return EX_CANTCREAT;
3203 else
3204 return EXIT_SUCCESS;
3205 }
Unnamed repository; edit this file 'description' to name the repository.