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tmpfiles: split out ~ mode handling into a helper function
[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/file.h>
16 #include <sys/stat.h>
17 #include <sys/xattr.h>
18 #include <sysexits.h>
19 #include <time.h>
20 #include <unistd.h>
21
22 #include "sd-path.h"
23
24 #include "acl-util.h"
25 #include "alloc-util.h"
26 #include "btrfs-util.h"
27 #include "capability-util.h"
28 #include "chattr-util.h"
29 #include "conf-files.h"
30 #include "copy.h"
31 #include "def.h"
32 #include "dirent-util.h"
33 #include "escape.h"
34 #include "fd-util.h"
35 #include "fileio.h"
36 #include "format-util.h"
37 #include "fs-util.h"
38 #include "glob-util.h"
39 #include "io-util.h"
40 #include "label.h"
41 #include "log.h"
42 #include "macro.h"
43 #include "main-func.h"
44 #include "missing.h"
45 #include "mkdir.h"
46 #include "mountpoint-util.h"
47 #include "pager.h"
48 #include "parse-util.h"
49 #include "path-lookup.h"
50 #include "path-util.h"
51 #include "pretty-print.h"
52 #include "rlimit-util.h"
53 #include "rm-rf.h"
54 #include "selinux-util.h"
55 #include "set.h"
56 #include "sort-util.h"
57 #include "specifier.h"
58 #include "stat-util.h"
59 #include "stdio-util.h"
60 #include "string-table.h"
61 #include "string-util.h"
62 #include "strv.h"
63 #include "umask-util.h"
64 #include "user-util.h"
65
66 /* This reads all files listed in /etc/tmpfiles.d/?*.conf and creates
67 * them in the file system. This is intended to be used to create
68 * properly owned directories beneath /tmp, /var/tmp, /run, which are
69 * volatile and hence need to be recreated on bootup. */
70
71 typedef enum OperationMask {
72 OPERATION_CREATE = 1 << 0,
73 OPERATION_REMOVE = 1 << 1,
74 OPERATION_CLEAN = 1 << 2,
75 } OperationMask;
76
77 typedef enum ItemType {
78 /* These ones take file names */
79 CREATE_FILE = 'f',
80 TRUNCATE_FILE = 'F',
81 CREATE_DIRECTORY = 'd',
82 TRUNCATE_DIRECTORY = 'D',
83 CREATE_SUBVOLUME = 'v',
84 CREATE_SUBVOLUME_INHERIT_QUOTA = 'q',
85 CREATE_SUBVOLUME_NEW_QUOTA = 'Q',
86 CREATE_FIFO = 'p',
87 CREATE_SYMLINK = 'L',
88 CREATE_CHAR_DEVICE = 'c',
89 CREATE_BLOCK_DEVICE = 'b',
90 COPY_FILES = 'C',
91
92 /* These ones take globs */
93 WRITE_FILE = 'w',
94 EMPTY_DIRECTORY = 'e',
95 SET_XATTR = 't',
96 RECURSIVE_SET_XATTR = 'T',
97 SET_ACL = 'a',
98 RECURSIVE_SET_ACL = 'A',
99 SET_ATTRIBUTE = 'h',
100 RECURSIVE_SET_ATTRIBUTE = 'H',
101 IGNORE_PATH = 'x',
102 IGNORE_DIRECTORY_PATH = 'X',
103 REMOVE_PATH = 'r',
104 RECURSIVE_REMOVE_PATH = 'R',
105 RELABEL_PATH = 'z',
106 RECURSIVE_RELABEL_PATH = 'Z',
107 ADJUST_MODE = 'm', /* legacy, 'z' is identical to this */
108 } ItemType;
109
110 typedef struct Item {
111 ItemType type;
112
113 char *path;
114 char *argument;
115 char **xattrs;
116 #if HAVE_ACL
117 acl_t acl_access;
118 acl_t acl_default;
119 #endif
120 uid_t uid;
121 gid_t gid;
122 mode_t mode;
123 usec_t age;
124
125 dev_t major_minor;
126 unsigned attribute_value;
127 unsigned attribute_mask;
128
129 bool uid_set:1;
130 bool gid_set:1;
131 bool mode_set:1;
132 bool age_set:1;
133 bool mask_perms:1;
134 bool attribute_set:1;
135
136 bool keep_first_level:1;
137
138 bool force:1;
139
140 bool allow_failure:1;
141
142 OperationMask done;
143 } Item;
144
145 typedef struct ItemArray {
146 Item *items;
147 size_t n_items;
148 size_t allocated;
149
150 struct ItemArray *parent;
151 Set *children;
152 } ItemArray;
153
154 typedef enum DirectoryType {
155 DIRECTORY_RUNTIME,
156 DIRECTORY_STATE,
157 DIRECTORY_CACHE,
158 DIRECTORY_LOGS,
159 _DIRECTORY_TYPE_MAX,
160 } DirectoryType;
161
162 static bool arg_cat_config = false;
163 static bool arg_user = false;
164 static OperationMask arg_operation = 0;
165 static bool arg_boot = false;
166 static PagerFlags arg_pager_flags = 0;
167
168 static char **arg_include_prefixes = NULL;
169 static char **arg_exclude_prefixes = NULL;
170 static char *arg_root = NULL;
171 static char *arg_replace = NULL;
172
173 #define MAX_DEPTH 256
174
175 static OrderedHashmap *items = NULL, *globs = NULL;
176 static Set *unix_sockets = NULL;
177
178 STATIC_DESTRUCTOR_REGISTER(items, ordered_hashmap_freep);
179 STATIC_DESTRUCTOR_REGISTER(globs, ordered_hashmap_freep);
180 STATIC_DESTRUCTOR_REGISTER(unix_sockets, set_free_freep);
181 STATIC_DESTRUCTOR_REGISTER(arg_include_prefixes, freep);
182 STATIC_DESTRUCTOR_REGISTER(arg_exclude_prefixes, freep);
183 STATIC_DESTRUCTOR_REGISTER(arg_root, freep);
184
185 static int specifier_machine_id_safe(char specifier, const void *data, const void *userdata, char **ret);
186 static int specifier_directory(char specifier, const void *data, const void *userdata, char **ret);
187
188 static const Specifier specifier_table[] = {
189 { 'm', specifier_machine_id_safe, NULL },
190 { 'b', specifier_boot_id, NULL },
191 { 'H', specifier_host_name, NULL },
192 { 'v', specifier_kernel_release, NULL },
193
194 { 'g', specifier_group_name, NULL },
195 { 'G', specifier_group_id, NULL },
196 { 'U', specifier_user_id, NULL },
197 { 'u', specifier_user_name, NULL },
198 { 'h', specifier_user_home, NULL },
199
200 { 't', specifier_directory, UINT_TO_PTR(DIRECTORY_RUNTIME) },
201 { 'S', specifier_directory, UINT_TO_PTR(DIRECTORY_STATE) },
202 { 'C', specifier_directory, UINT_TO_PTR(DIRECTORY_CACHE) },
203 { 'L', specifier_directory, UINT_TO_PTR(DIRECTORY_LOGS) },
204 { 'T', specifier_tmp_dir, NULL },
205 { 'V', specifier_var_tmp_dir, NULL },
206 {}
207 };
208
209 static int specifier_machine_id_safe(char specifier, const void *data, const void *userdata, char **ret) {
210 int r;
211
212 /* If /etc/machine_id is missing or empty (e.g. in a chroot environment)
213 * return a recognizable error so that the caller can skip the rule
214 * gracefully. */
215
216 r = specifier_machine_id(specifier, data, userdata, ret);
217 if (IN_SET(r, -ENOENT, -ENOMEDIUM))
218 return -ENXIO;
219
220 return r;
221 }
222
223 static int specifier_directory(char specifier, const void *data, const void *userdata, char **ret) {
224 struct table_entry {
225 uint64_t type;
226 const char *suffix;
227 };
228
229 static const struct table_entry paths_system[] = {
230 [DIRECTORY_RUNTIME] = { SD_PATH_SYSTEM_RUNTIME },
231 [DIRECTORY_STATE] = { SD_PATH_SYSTEM_STATE_PRIVATE },
232 [DIRECTORY_CACHE] = { SD_PATH_SYSTEM_STATE_CACHE },
233 [DIRECTORY_LOGS] = { SD_PATH_SYSTEM_STATE_LOGS },
234 };
235
236 static const struct table_entry paths_user[] = {
237 [DIRECTORY_RUNTIME] = { SD_PATH_USER_RUNTIME },
238 [DIRECTORY_STATE] = { SD_PATH_USER_CONFIGURATION },
239 [DIRECTORY_CACHE] = { SD_PATH_USER_STATE_CACHE },
240 [DIRECTORY_LOGS] = { SD_PATH_USER_CONFIGURATION, "log" },
241 };
242
243 unsigned i;
244 const struct table_entry *paths;
245
246 assert_cc(ELEMENTSOF(paths_system) == ELEMENTSOF(paths_user));
247 paths = arg_user ? paths_user : paths_system;
248
249 i = PTR_TO_UINT(data);
250 assert(i < ELEMENTSOF(paths_system));
251
252 return sd_path_home(paths[i].type, paths[i].suffix, ret);
253 }
254
255 static int log_unresolvable_specifier(const char *filename, unsigned line) {
256 static bool notified = false;
257
258 /* In system mode, this is called when /etc is not fully initialized (e.g.
259 * in a chroot environment) where some specifiers are unresolvable. In user
260 * mode, this is called when some variables are not defined. These cases are
261 * not considered as an error so log at LOG_NOTICE only for the first time
262 * and then downgrade this to LOG_DEBUG for the rest. */
263
264 log_full(notified ? LOG_DEBUG : LOG_NOTICE,
265 "[%s:%u] Failed to resolve specifier: %s, skipping",
266 filename, line,
267 arg_user ? "Required $XDG_... variable not defined" : "uninitialized /etc detected");
268
269 if (!notified)
270 log_notice("All rules containing unresolvable specifiers will be skipped.");
271
272 notified = true;
273 return 0;
274 }
275
276 static int user_config_paths(char*** ret) {
277 _cleanup_strv_free_ char **config_dirs = NULL, **data_dirs = NULL;
278 _cleanup_free_ char *persistent_config = NULL, *runtime_config = NULL, *data_home = NULL;
279 _cleanup_strv_free_ char **res = NULL;
280 int r;
281
282 r = xdg_user_dirs(&config_dirs, &data_dirs);
283 if (r < 0)
284 return r;
285
286 r = xdg_user_config_dir(&persistent_config, "/user-tmpfiles.d");
287 if (r < 0 && r != -ENXIO)
288 return r;
289
290 r = xdg_user_runtime_dir(&runtime_config, "/user-tmpfiles.d");
291 if (r < 0 && r != -ENXIO)
292 return r;
293
294 r = xdg_user_data_dir(&data_home, "/user-tmpfiles.d");
295 if (r < 0 && r != -ENXIO)
296 return r;
297
298 r = strv_extend_strv_concat(&res, config_dirs, "/user-tmpfiles.d");
299 if (r < 0)
300 return r;
301
302 r = strv_extend(&res, persistent_config);
303 if (r < 0)
304 return r;
305
306 r = strv_extend(&res, runtime_config);
307 if (r < 0)
308 return r;
309
310 r = strv_extend(&res, data_home);
311 if (r < 0)
312 return r;
313
314 r = strv_extend_strv_concat(&res, data_dirs, "/user-tmpfiles.d");
315 if (r < 0)
316 return r;
317
318 r = path_strv_make_absolute_cwd(res);
319 if (r < 0)
320 return r;
321
322 *ret = TAKE_PTR(res);
323 return 0;
324 }
325
326 static bool needs_glob(ItemType t) {
327 return IN_SET(t,
328 WRITE_FILE,
329 IGNORE_PATH,
330 IGNORE_DIRECTORY_PATH,
331 REMOVE_PATH,
332 RECURSIVE_REMOVE_PATH,
333 EMPTY_DIRECTORY,
334 ADJUST_MODE,
335 RELABEL_PATH,
336 RECURSIVE_RELABEL_PATH,
337 SET_XATTR,
338 RECURSIVE_SET_XATTR,
339 SET_ACL,
340 RECURSIVE_SET_ACL,
341 SET_ATTRIBUTE,
342 RECURSIVE_SET_ATTRIBUTE);
343 }
344
345 static bool takes_ownership(ItemType t) {
346 return IN_SET(t,
347 CREATE_FILE,
348 TRUNCATE_FILE,
349 CREATE_DIRECTORY,
350 EMPTY_DIRECTORY,
351 TRUNCATE_DIRECTORY,
352 CREATE_SUBVOLUME,
353 CREATE_SUBVOLUME_INHERIT_QUOTA,
354 CREATE_SUBVOLUME_NEW_QUOTA,
355 CREATE_FIFO,
356 CREATE_SYMLINK,
357 CREATE_CHAR_DEVICE,
358 CREATE_BLOCK_DEVICE,
359 COPY_FILES,
360 WRITE_FILE,
361 IGNORE_PATH,
362 IGNORE_DIRECTORY_PATH,
363 REMOVE_PATH,
364 RECURSIVE_REMOVE_PATH);
365 }
366
367 static struct Item* find_glob(OrderedHashmap *h, const char *match) {
368 ItemArray *j;
369 Iterator i;
370
371 ORDERED_HASHMAP_FOREACH(j, h, i) {
372 size_t n;
373
374 for (n = 0; n < j->n_items; n++) {
375 Item *item = j->items + n;
376
377 if (fnmatch(item->path, match, FNM_PATHNAME|FNM_PERIOD) == 0)
378 return item;
379 }
380 }
381
382 return NULL;
383 }
384
385 static int load_unix_sockets(void) {
386 _cleanup_set_free_free_ Set *sockets = NULL;
387 _cleanup_fclose_ FILE *f = NULL;
388 int r;
389
390 if (unix_sockets)
391 return 0;
392
393 /* We maintain a cache of the sockets we found in /proc/net/unix to speed things up a little. */
394
395 sockets = set_new(&path_hash_ops);
396 if (!sockets)
397 return log_oom();
398
399 f = fopen("/proc/net/unix", "re");
400 if (!f)
401 return log_full_errno(errno == ENOENT ? LOG_DEBUG : LOG_WARNING, errno,
402 "Failed to open /proc/net/unix, ignoring: %m");
403
404 /* Skip header */
405 r = read_line(f, LONG_LINE_MAX, NULL);
406 if (r < 0)
407 return log_warning_errno(r, "Failed to skip /proc/net/unix header line: %m");
408 if (r == 0)
409 return log_warning_errno(SYNTHETIC_ERRNO(EIO), "Premature end of file reading /proc/net/unix.");
410
411 for (;;) {
412 _cleanup_free_ char *line = NULL, *s = NULL;
413 char *p;
414
415 r = read_line(f, LONG_LINE_MAX, &line);
416 if (r < 0)
417 return log_warning_errno(r, "Failed to read /proc/net/unix line, ignoring: %m");
418 if (r == 0) /* EOF */
419 break;
420
421 p = strchr(line, ':');
422 if (!p)
423 continue;
424
425 if (strlen(p) < 37)
426 continue;
427
428 p += 37;
429 p += strspn(p, WHITESPACE);
430 p += strcspn(p, WHITESPACE); /* skip one more word */
431 p += strspn(p, WHITESPACE);
432
433 if (*p != '/')
434 continue;
435
436 s = strdup(p);
437 if (!s)
438 return log_oom();
439
440 path_simplify(s, false);
441
442 r = set_consume(sockets, s);
443 if (r == -EEXIST)
444 continue;
445 if (r < 0)
446 return log_warning_errno(r, "Failed to add AF_UNIX socket to set, ignoring: %m");
447
448 TAKE_PTR(s);
449 }
450
451 unix_sockets = TAKE_PTR(sockets);
452 return 1;
453 }
454
455 static bool unix_socket_alive(const char *fn) {
456 assert(fn);
457
458 if (load_unix_sockets() < 0)
459 return true; /* We don't know, so assume yes */
460
461 return !!set_get(unix_sockets, (char*) fn);
462 }
463
464 static int dir_is_mount_point(DIR *d, const char *subdir) {
465
466 int mount_id_parent, mount_id;
467 int r_p, r;
468
469 r_p = name_to_handle_at_loop(dirfd(d), ".", NULL, &mount_id_parent, 0);
470 if (r_p < 0)
471 r_p = -errno;
472
473 r = name_to_handle_at_loop(dirfd(d), subdir, NULL, &mount_id, 0);
474 if (r < 0)
475 r = -errno;
476
477 /* got no handle; make no assumptions, return error */
478 if (r_p < 0 && r < 0)
479 return r_p;
480
481 /* got both handles; if they differ, it is a mount point */
482 if (r_p >= 0 && r >= 0)
483 return mount_id_parent != mount_id;
484
485 /* got only one handle; assume different mount points if one
486 * of both queries was not supported by the filesystem */
487 if (IN_SET(r_p, -ENOSYS, -EOPNOTSUPP) || IN_SET(r, -ENOSYS, -EOPNOTSUPP))
488 return true;
489
490 /* return error */
491 if (r_p < 0)
492 return r_p;
493 return r;
494 }
495
496 static DIR* xopendirat_nomod(int dirfd, const char *path) {
497 DIR *dir;
498
499 dir = xopendirat(dirfd, path, O_NOFOLLOW|O_NOATIME);
500 if (dir)
501 return dir;
502
503 log_debug_errno(errno, "Cannot open %sdirectory \"%s\": %m", dirfd == AT_FDCWD ? "" : "sub", path);
504 if (errno != EPERM)
505 return NULL;
506
507 dir = xopendirat(dirfd, path, O_NOFOLLOW);
508 if (!dir)
509 log_debug_errno(errno, "Cannot open %sdirectory \"%s\": %m", dirfd == AT_FDCWD ? "" : "sub", path);
510
511 return dir;
512 }
513
514 static DIR* opendir_nomod(const char *path) {
515 return xopendirat_nomod(AT_FDCWD, path);
516 }
517
518 static int dir_cleanup(
519 Item *i,
520 const char *p,
521 DIR *d,
522 const struct stat *ds,
523 usec_t cutoff,
524 dev_t rootdev,
525 bool mountpoint,
526 int maxdepth,
527 bool keep_this_level) {
528
529 struct dirent *dent;
530 bool deleted = false;
531 int r = 0;
532
533 FOREACH_DIRENT_ALL(dent, d, break) {
534 struct stat s;
535 usec_t age;
536 _cleanup_free_ char *sub_path = NULL;
537
538 if (dot_or_dot_dot(dent->d_name))
539 continue;
540
541 if (fstatat(dirfd(d), dent->d_name, &s, AT_SYMLINK_NOFOLLOW) < 0) {
542 if (errno == ENOENT)
543 continue;
544
545 /* FUSE, NFS mounts, SELinux might return EACCES */
546 r = log_full_errno(errno == EACCES ? LOG_DEBUG : LOG_ERR, errno,
547 "stat(%s/%s) failed: %m", p, dent->d_name);
548 continue;
549 }
550
551 /* Stay on the same filesystem */
552 if (s.st_dev != rootdev) {
553 log_debug("Ignoring \"%s/%s\": different filesystem.", p, dent->d_name);
554 continue;
555 }
556
557 /* Try to detect bind mounts of the same filesystem instance; they
558 * do not differ in device major/minors. This type of query is not
559 * supported on all kernels or filesystem types though. */
560 if (S_ISDIR(s.st_mode) && dir_is_mount_point(d, dent->d_name) > 0) {
561 log_debug("Ignoring \"%s/%s\": different mount of the same filesystem.",
562 p, dent->d_name);
563 continue;
564 }
565
566 sub_path = strjoin(p, "/", dent->d_name);
567 if (!sub_path) {
568 r = log_oom();
569 goto finish;
570 }
571
572 /* Is there an item configured for this path? */
573 if (ordered_hashmap_get(items, sub_path)) {
574 log_debug("Ignoring \"%s\": a separate entry exists.", sub_path);
575 continue;
576 }
577
578 if (find_glob(globs, sub_path)) {
579 log_debug("Ignoring \"%s\": a separate glob exists.", sub_path);
580 continue;
581 }
582
583 if (S_ISDIR(s.st_mode)) {
584 _cleanup_closedir_ DIR *sub_dir = NULL;
585
586 if (mountpoint &&
587 streq(dent->d_name, "lost+found") &&
588 s.st_uid == 0) {
589 log_debug("Ignoring directory \"%s\".", sub_path);
590 continue;
591 }
592
593 if (maxdepth <= 0)
594 log_warning("Reached max depth on \"%s\".", sub_path);
595 else {
596 int q;
597
598 sub_dir = xopendirat_nomod(dirfd(d), dent->d_name);
599 if (!sub_dir) {
600 if (errno != ENOENT)
601 r = log_warning_errno(errno, "Opening directory \"%s\" failed, ignoring: %m", sub_path);
602
603 continue;
604 }
605
606 if (flock(dirfd(sub_dir), LOCK_EX|LOCK_NB) < 0) {
607 log_debug_errno(errno, "Couldn't acquire shared BSD lock on directory \"%s\", skipping: %m", p);
608 continue;
609 }
610
611 q = dir_cleanup(i, sub_path, sub_dir, &s, cutoff, rootdev, false, maxdepth-1, false);
612 if (q < 0)
613 r = q;
614 }
615
616 /* Note: if you are wondering why we don't support the sticky bit for excluding
617 * directories from cleaning like we do it for other file system objects: well, the
618 * sticky bit already has a meaning for directories, so we don't want to overload
619 * that. */
620
621 if (keep_this_level) {
622 log_debug("Keeping directory \"%s\".", sub_path);
623 continue;
624 }
625
626 /* Ignore ctime, we change it when deleting */
627 age = timespec_load(&s.st_mtim);
628 if (age >= cutoff) {
629 char a[FORMAT_TIMESTAMP_MAX];
630 /* Follows spelling in stat(1). */
631 log_debug("Directory \"%s\": modify time %s is too new.",
632 sub_path,
633 format_timestamp_us(a, sizeof(a), age));
634 continue;
635 }
636
637 age = timespec_load(&s.st_atim);
638 if (age >= cutoff) {
639 char a[FORMAT_TIMESTAMP_MAX];
640 log_debug("Directory \"%s\": access time %s is too new.",
641 sub_path,
642 format_timestamp_us(a, sizeof(a), age));
643 continue;
644 }
645
646 log_debug("Removing directory \"%s\".", sub_path);
647 if (unlinkat(dirfd(d), dent->d_name, AT_REMOVEDIR) < 0)
648 if (!IN_SET(errno, ENOENT, ENOTEMPTY))
649 r = log_warning_errno(errno, "Failed to remove directory \"%s\", ignoring: %m", sub_path);
650
651 } else {
652 /* Skip files for which the sticky bit is set. These are semantics we define, and are
653 * unknown elsewhere. See XDG_RUNTIME_DIR specification for details. */
654 if (s.st_mode & S_ISVTX) {
655 log_debug("Skipping \"%s\": sticky bit set.", sub_path);
656 continue;
657 }
658
659 if (mountpoint && S_ISREG(s.st_mode))
660 if (s.st_uid == 0 && STR_IN_SET(dent->d_name,
661 ".journal",
662 "aquota.user",
663 "aquota.group")) {
664 log_debug("Skipping \"%s\".", sub_path);
665 continue;
666 }
667
668 /* Ignore sockets that are listed in /proc/net/unix */
669 if (S_ISSOCK(s.st_mode) && unix_socket_alive(sub_path)) {
670 log_debug("Skipping \"%s\": live socket.", sub_path);
671 continue;
672 }
673
674 /* Ignore device nodes */
675 if (S_ISCHR(s.st_mode) || S_ISBLK(s.st_mode)) {
676 log_debug("Skipping \"%s\": a device.", sub_path);
677 continue;
678 }
679
680 /* Keep files on this level around if this is requested */
681 if (keep_this_level) {
682 log_debug("Keeping \"%s\".", sub_path);
683 continue;
684 }
685
686 age = timespec_load(&s.st_mtim);
687 if (age >= cutoff) {
688 char a[FORMAT_TIMESTAMP_MAX];
689 /* Follows spelling in stat(1). */
690 log_debug("File \"%s\": modify time %s is too new.",
691 sub_path,
692 format_timestamp_us(a, sizeof(a), age));
693 continue;
694 }
695
696 age = timespec_load(&s.st_atim);
697 if (age >= cutoff) {
698 char a[FORMAT_TIMESTAMP_MAX];
699 log_debug("File \"%s\": access time %s is too new.",
700 sub_path,
701 format_timestamp_us(a, sizeof(a), age));
702 continue;
703 }
704
705 age = timespec_load(&s.st_ctim);
706 if (age >= cutoff) {
707 char a[FORMAT_TIMESTAMP_MAX];
708 log_debug("File \"%s\": change time %s is too new.",
709 sub_path,
710 format_timestamp_us(a, sizeof(a), age));
711 continue;
712 }
713
714 log_debug("Removing \"%s\".", sub_path);
715 if (unlinkat(dirfd(d), dent->d_name, 0) < 0)
716 if (errno != ENOENT)
717 r = log_warning_errno(errno, "Failed to remove \"%s\", ignoring: %m", sub_path);
718
719 deleted = true;
720 }
721 }
722
723 finish:
724 if (deleted) {
725 char a[FORMAT_TIMESTAMP_MAX], b[FORMAT_TIMESTAMP_MAX];
726 usec_t age1, age2;
727
728 age1 = timespec_load(&ds->st_atim);
729 age2 = timespec_load(&ds->st_mtim);
730
731 log_debug("Restoring access and modification time on \"%s\": %s, %s",
732 p,
733 format_timestamp_us(a, sizeof(a), age1),
734 format_timestamp_us(b, sizeof(b), age2));
735
736 /* Restore original directory timestamps */
737 if (futimens(dirfd(d), (struct timespec[]) {
738 ds->st_atim,
739 ds->st_mtim }) < 0)
740 log_warning_errno(errno, "Failed to revert timestamps of '%s', ignoring: %m", p);
741 }
742
743 return r;
744 }
745
746 static bool dangerous_hardlinks(void) {
747 _cleanup_free_ char *value = NULL;
748 static int cached = -1;
749 int r;
750
751 /* Check whether the fs.protected_hardlinks sysctl is on. If we can't determine it we assume its off, as that's
752 * what the upstream default is. */
753
754 if (cached >= 0)
755 return cached;
756
757 r = read_one_line_file("/proc/sys/fs/protected_hardlinks", &value);
758 if (r < 0) {
759 log_debug_errno(r, "Failed to read fs.protected_hardlinks sysctl: %m");
760 return true;
761 }
762
763 r = parse_boolean(value);
764 if (r < 0) {
765 log_debug_errno(r, "Failed to parse fs.protected_hardlinks sysctl: %m");
766 return true;
767 }
768
769 cached = r == 0;
770 return cached;
771 }
772
773 static bool hardlink_vulnerable(const struct stat *st) {
774 assert(st);
775
776 return !S_ISDIR(st->st_mode) && st->st_nlink > 1 && dangerous_hardlinks();
777 }
778
779 static mode_t process_mask_perms(mode_t mode, mode_t current) {
780
781 if ((current & 0111) == 0)
782 mode &= ~0111;
783 if ((current & 0222) == 0)
784 mode &= ~0222;
785 if ((current & 0444) == 0)
786 mode &= ~0444;
787 if (!S_ISDIR(current))
788 mode &= ~07000; /* remove sticky/sgid/suid bit, unless directory */
789
790 return mode;
791 }
792
793 static int fd_set_perms(Item *i, int fd, const char *path, const struct stat *st) {
794 struct stat stbuf;
795
796 assert(i);
797 assert(fd);
798 assert(path);
799
800 if (!i->mode_set && !i->uid_set && !i->gid_set)
801 goto shortcut;
802
803 if (!st) {
804 if (fstat(fd, &stbuf) < 0)
805 return log_error_errno(errno, "fstat(%s) failed: %m", path);
806 st = &stbuf;
807 }
808
809 if (hardlink_vulnerable(st))
810 return log_error_errno(SYNTHETIC_ERRNO(EPERM),
811 "Refusing to set permissions on hardlinked file %s while the fs.protected_hardlinks sysctl is turned off.",
812 path);
813
814
815
816 if (i->mode_set) {
817 if (S_ISLNK(st->st_mode))
818 log_debug("Skipping mode fix for symlink %s.", path);
819 else {
820 mode_t m = i->mode;
821
822 if (i->mask_perms)
823 m = process_mask_perms(m, st->st_mode);
824
825 if (m == (st->st_mode & 07777))
826 log_debug("\"%s\" has correct mode %o already.", path, st->st_mode);
827 else {
828 log_debug("Changing \"%s\" to mode %o.", path, m);
829 if (fchmod_opath(fd, m) < 0)
830 return log_error_errno(errno, "fchmod() of %s failed: %m", path);
831 }
832 }
833 }
834
835 if ((i->uid_set && i->uid != st->st_uid) ||
836 (i->gid_set && i->gid != st->st_gid)) {
837 log_debug("Changing \"%s\" to owner "UID_FMT":"GID_FMT,
838 path,
839 i->uid_set ? i->uid : UID_INVALID,
840 i->gid_set ? i->gid : GID_INVALID);
841
842 if (fchownat(fd,
843 "",
844 i->uid_set ? i->uid : UID_INVALID,
845 i->gid_set ? i->gid : GID_INVALID,
846 AT_EMPTY_PATH) < 0)
847 return log_error_errno(errno, "fchownat() of %s failed: %m", path);
848 }
849
850 shortcut:
851 return label_fix(path, 0);
852 }
853
854 static int path_open_parent_safe(const char *path) {
855 _cleanup_free_ char *dn = NULL;
856 int fd;
857
858 if (path_equal(path, "/") || !path_is_normalized(path))
859 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
860 "Failed to open parent of '%s': invalid path.",
861 path);
862
863 dn = dirname_malloc(path);
864 if (!dn)
865 return log_oom();
866
867 fd = chase_symlinks(dn, arg_root, CHASE_OPEN|CHASE_SAFE|CHASE_WARN, NULL);
868 if (fd < 0 && fd != -ENOLINK)
869 return log_error_errno(fd, "Failed to validate path %s: %m", path);
870
871 return fd;
872 }
873
874 static int path_open_safe(const char *path) {
875 int fd;
876
877 /* path_open_safe() returns a file descriptor opened with O_PATH after
878 * verifying that the path doesn't contain unsafe transitions, except
879 * for its final component as the function does not follow symlink. */
880
881 assert(path);
882
883 if (!path_is_normalized(path))
884 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
885 "Failed to open invalid path '%s'.",
886 path);
887
888 fd = chase_symlinks(path, arg_root, CHASE_OPEN|CHASE_SAFE|CHASE_WARN|CHASE_NOFOLLOW, NULL);
889 if (fd < 0 && fd != -ENOLINK)
890 return log_error_errno(fd, "Failed to validate path %s: %m", path);
891
892 return fd;
893 }
894
895 static int path_set_perms(Item *i, const char *path) {
896 _cleanup_close_ int fd = -1;
897
898 assert(i);
899 assert(path);
900
901 fd = path_open_safe(path);
902 if (fd < 0)
903 return fd;
904
905 return fd_set_perms(i, fd, path, NULL);
906 }
907
908 static int parse_xattrs_from_arg(Item *i) {
909 const char *p;
910 int r;
911
912 assert(i);
913 assert(i->argument);
914
915 p = i->argument;
916
917 for (;;) {
918 _cleanup_free_ char *name = NULL, *value = NULL, *xattr = NULL;
919
920 r = extract_first_word(&p, &xattr, NULL, EXTRACT_QUOTES|EXTRACT_CUNESCAPE);
921 if (r < 0)
922 log_warning_errno(r, "Failed to parse extended attribute '%s', ignoring: %m", p);
923 if (r <= 0)
924 break;
925
926 r = split_pair(xattr, "=", &name, &value);
927 if (r < 0) {
928 log_warning_errno(r, "Failed to parse extended attribute, ignoring: %s", xattr);
929 continue;
930 }
931
932 if (isempty(name) || isempty(value)) {
933 log_warning("Malformed extended attribute found, ignoring: %s", xattr);
934 continue;
935 }
936
937 if (strv_push_pair(&i->xattrs, name, value) < 0)
938 return log_oom();
939
940 name = value = NULL;
941 }
942
943 return 0;
944 }
945
946 static int fd_set_xattrs(Item *i, int fd, const char *path, const struct stat *st) {
947 char procfs_path[STRLEN("/proc/self/fd/") + DECIMAL_STR_MAX(int)];
948 char **name, **value;
949
950 assert(i);
951 assert(fd);
952 assert(path);
953
954 xsprintf(procfs_path, "/proc/self/fd/%i", fd);
955
956 STRV_FOREACH_PAIR(name, value, i->xattrs) {
957 log_debug("Setting extended attribute '%s=%s' on %s.", *name, *value, path);
958 if (setxattr(procfs_path, *name, *value, strlen(*value), 0) < 0)
959 return log_error_errno(errno, "Setting extended attribute %s=%s on %s failed: %m",
960 *name, *value, path);
961 }
962 return 0;
963 }
964
965 static int path_set_xattrs(Item *i, const char *path) {
966 _cleanup_close_ int fd = -1;
967
968 assert(i);
969 assert(path);
970
971 fd = path_open_safe(path);
972 if (fd < 0)
973 return fd;
974
975 return fd_set_xattrs(i, fd, path, NULL);
976 }
977
978 static int parse_acls_from_arg(Item *item) {
979 #if HAVE_ACL
980 int r;
981
982 assert(item);
983
984 /* If force (= modify) is set, we will not modify the acl
985 * afterwards, so the mask can be added now if necessary. */
986
987 r = parse_acl(item->argument, &item->acl_access, &item->acl_default, !item->force);
988 if (r < 0)
989 log_warning_errno(r, "Failed to parse ACL \"%s\": %m. Ignoring", item->argument);
990 #else
991 log_warning_errno(SYNTHETIC_ERRNO(ENOSYS), "ACLs are not supported. Ignoring");
992 #endif
993
994 return 0;
995 }
996
997 #if HAVE_ACL
998 static int path_set_acl(const char *path, const char *pretty, acl_type_t type, acl_t acl, bool modify) {
999 _cleanup_(acl_free_charpp) char *t = NULL;
1000 _cleanup_(acl_freep) acl_t dup = NULL;
1001 int r;
1002
1003 /* Returns 0 for success, positive error if already warned,
1004 * negative error otherwise. */
1005
1006 if (modify) {
1007 r = acls_for_file(path, type, acl, &dup);
1008 if (r < 0)
1009 return r;
1010
1011 r = calc_acl_mask_if_needed(&dup);
1012 if (r < 0)
1013 return r;
1014 } else {
1015 dup = acl_dup(acl);
1016 if (!dup)
1017 return -errno;
1018
1019 /* the mask was already added earlier if needed */
1020 }
1021
1022 r = add_base_acls_if_needed(&dup, path);
1023 if (r < 0)
1024 return r;
1025
1026 t = acl_to_any_text(dup, NULL, ',', TEXT_ABBREVIATE);
1027 log_debug("Setting %s ACL %s on %s.",
1028 type == ACL_TYPE_ACCESS ? "access" : "default",
1029 strna(t), pretty);
1030
1031 r = acl_set_file(path, type, dup);
1032 if (r < 0)
1033 /* Return positive to indicate we already warned */
1034 return -log_error_errno(errno,
1035 "Setting %s ACL \"%s\" on %s failed: %m",
1036 type == ACL_TYPE_ACCESS ? "access" : "default",
1037 strna(t), pretty);
1038
1039 return 0;
1040 }
1041 #endif
1042
1043 static int fd_set_acls(Item *item, int fd, const char *path, const struct stat *st) {
1044 int r = 0;
1045 #if HAVE_ACL
1046 char procfs_path[STRLEN("/proc/self/fd/") + DECIMAL_STR_MAX(int)];
1047 struct stat stbuf;
1048
1049 assert(item);
1050 assert(fd);
1051 assert(path);
1052
1053 if (!st) {
1054 if (fstat(fd, &stbuf) < 0)
1055 return log_error_errno(errno, "fstat(%s) failed: %m", path);
1056 st = &stbuf;
1057 }
1058
1059 if (hardlink_vulnerable(st))
1060 return log_error_errno(SYNTHETIC_ERRNO(EPERM),
1061 "Refusing to set ACLs on hardlinked file %s while the fs.protected_hardlinks sysctl is turned off.",
1062 path);
1063
1064 if (S_ISLNK(st->st_mode)) {
1065 log_debug("Skipping ACL fix for symlink %s.", path);
1066 return 0;
1067 }
1068
1069 xsprintf(procfs_path, "/proc/self/fd/%i", fd);
1070
1071 if (item->acl_access)
1072 r = path_set_acl(procfs_path, path, ACL_TYPE_ACCESS, item->acl_access, item->force);
1073
1074 /* set only default acls to folders */
1075 if (r == 0 && item->acl_default && S_ISDIR(st->st_mode))
1076 r = path_set_acl(procfs_path, path, ACL_TYPE_DEFAULT, item->acl_default, item->force);
1077
1078 if (r > 0)
1079 return -r; /* already warned */
1080 if (r == -EOPNOTSUPP) {
1081 log_debug_errno(r, "ACLs not supported by file system at %s", path);
1082 return 0;
1083 }
1084 if (r < 0)
1085 return log_error_errno(r, "ACL operation on \"%s\" failed: %m", path);
1086 #endif
1087 return r;
1088 }
1089
1090 static int path_set_acls(Item *item, const char *path) {
1091 int r = 0;
1092 #if HAVE_ACL
1093 _cleanup_close_ int fd = -1;
1094
1095 assert(item);
1096 assert(path);
1097
1098 fd = path_open_safe(path);
1099 if (fd < 0)
1100 return fd;
1101
1102 r = fd_set_acls(item, fd, path, NULL);
1103 #endif
1104 return r;
1105 }
1106
1107 static int parse_attribute_from_arg(Item *item) {
1108
1109 static const struct {
1110 char character;
1111 unsigned value;
1112 } attributes[] = {
1113 { 'A', FS_NOATIME_FL }, /* do not update atime */
1114 { 'S', FS_SYNC_FL }, /* Synchronous updates */
1115 { 'D', FS_DIRSYNC_FL }, /* dirsync behaviour (directories only) */
1116 { 'a', FS_APPEND_FL }, /* writes to file may only append */
1117 { 'c', FS_COMPR_FL }, /* Compress file */
1118 { 'd', FS_NODUMP_FL }, /* do not dump file */
1119 { 'e', FS_EXTENT_FL }, /* Extents */
1120 { 'i', FS_IMMUTABLE_FL }, /* Immutable file */
1121 { 'j', FS_JOURNAL_DATA_FL }, /* Reserved for ext3 */
1122 { 's', FS_SECRM_FL }, /* Secure deletion */
1123 { 'u', FS_UNRM_FL }, /* Undelete */
1124 { 't', FS_NOTAIL_FL }, /* file tail should not be merged */
1125 { 'T', FS_TOPDIR_FL }, /* Top of directory hierarchies */
1126 { 'C', FS_NOCOW_FL }, /* Do not cow file */
1127 { 'P', FS_PROJINHERIT_FL }, /* Inherit the quota project ID */
1128 };
1129
1130 enum {
1131 MODE_ADD,
1132 MODE_DEL,
1133 MODE_SET
1134 } mode = MODE_ADD;
1135
1136 unsigned value = 0, mask = 0;
1137 const char *p;
1138
1139 assert(item);
1140
1141 p = item->argument;
1142 if (p) {
1143 if (*p == '+') {
1144 mode = MODE_ADD;
1145 p++;
1146 } else if (*p == '-') {
1147 mode = MODE_DEL;
1148 p++;
1149 } else if (*p == '=') {
1150 mode = MODE_SET;
1151 p++;
1152 }
1153 }
1154
1155 if (isempty(p) && mode != MODE_SET)
1156 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
1157 "Setting file attribute on '%s' needs an attribute specification.",
1158 item->path);
1159
1160 for (; p && *p ; p++) {
1161 unsigned i, v;
1162
1163 for (i = 0; i < ELEMENTSOF(attributes); i++)
1164 if (*p == attributes[i].character)
1165 break;
1166
1167 if (i >= ELEMENTSOF(attributes))
1168 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
1169 "Unknown file attribute '%c' on '%s'.",
1170 *p, item->path);
1171
1172 v = attributes[i].value;
1173
1174 SET_FLAG(value, v, IN_SET(mode, MODE_ADD, MODE_SET));
1175
1176 mask |= v;
1177 }
1178
1179 if (mode == MODE_SET)
1180 mask |= CHATTR_ALL_FL;
1181
1182 assert(mask != 0);
1183
1184 item->attribute_mask = mask;
1185 item->attribute_value = value;
1186 item->attribute_set = true;
1187
1188 return 0;
1189 }
1190
1191 static int fd_set_attribute(Item *item, int fd, const char *path, const struct stat *st) {
1192 _cleanup_close_ int procfs_fd = -1;
1193 struct stat stbuf;
1194 unsigned f;
1195 int r;
1196
1197 assert(item);
1198 assert(fd);
1199 assert(path);
1200
1201 if (!item->attribute_set || item->attribute_mask == 0)
1202 return 0;
1203
1204 if (!st) {
1205 if (fstat(fd, &stbuf) < 0)
1206 return log_error_errno(errno, "fstat(%s) failed: %m", path);
1207 st = &stbuf;
1208 }
1209
1210 /* Issuing the file attribute ioctls on device nodes is not
1211 * safe, as that will be delivered to the drivers, not the
1212 * file system containing the device node. */
1213 if (!S_ISREG(st->st_mode) && !S_ISDIR(st->st_mode))
1214 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
1215 "Setting file flags is only supported on regular files and directories, cannot set on '%s'.",
1216 path);
1217
1218 f = item->attribute_value & item->attribute_mask;
1219
1220 /* Mask away directory-specific flags */
1221 if (!S_ISDIR(st->st_mode))
1222 f &= ~FS_DIRSYNC_FL;
1223
1224 procfs_fd = fd_reopen(fd, O_RDONLY|O_CLOEXEC|O_NOATIME);
1225 if (procfs_fd < 0)
1226 return log_error_errno(procfs_fd, "Failed to re-open '%s': %m", path);
1227
1228 r = chattr_fd(procfs_fd, f, item->attribute_mask, NULL);
1229 if (r < 0)
1230 log_full_errno(IN_SET(r, -ENOTTY, -EOPNOTSUPP) ? LOG_DEBUG : LOG_WARNING,
1231 r,
1232 "Cannot set file attribute for '%s', value=0x%08x, mask=0x%08x, ignoring: %m",
1233 path, item->attribute_value, item->attribute_mask);
1234
1235 return 0;
1236 }
1237
1238 static int path_set_attribute(Item *item, const char *path) {
1239 _cleanup_close_ int fd = -1;
1240
1241 if (!item->attribute_set || item->attribute_mask == 0)
1242 return 0;
1243
1244 fd = path_open_safe(path);
1245 if (fd < 0)
1246 return fd;
1247
1248 return fd_set_attribute(item, fd, path, NULL);
1249 }
1250
1251 static int write_one_file(Item *i, const char *path) {
1252 _cleanup_close_ int fd = -1, dir_fd = -1;
1253 char *bn;
1254 int r;
1255
1256 assert(i);
1257 assert(path);
1258 assert(i->argument);
1259 assert(i->type == WRITE_FILE);
1260
1261 /* Validate the path and keep the fd on the directory for opening the
1262 * file so we're sure that it can't be changed behind our back. */
1263 dir_fd = path_open_parent_safe(path);
1264 if (dir_fd < 0)
1265 return dir_fd;
1266
1267 bn = basename(path);
1268
1269 /* Follows symlinks */
1270 fd = openat(dir_fd, bn, O_NONBLOCK|O_CLOEXEC|O_WRONLY|O_NOCTTY, i->mode);
1271 if (fd < 0) {
1272 if (errno == ENOENT) {
1273 log_debug_errno(errno, "Not writing missing file \"%s\": %m", path);
1274 return 0;
1275 }
1276 return log_error_errno(errno, "Failed to open file \"%s\": %m", path);
1277 }
1278
1279 /* 'w' is allowed to write into any kind of files. */
1280 log_debug("Writing to \"%s\".", path);
1281
1282 r = loop_write(fd, i->argument, strlen(i->argument), false);
1283 if (r < 0)
1284 return log_error_errno(r, "Failed to write file \"%s\": %m", path);
1285
1286 return fd_set_perms(i, fd, path, NULL);
1287 }
1288
1289 static int create_file(Item *i, const char *path) {
1290 _cleanup_close_ int fd = -1, dir_fd = -1;
1291 struct stat stbuf, *st = NULL;
1292 int r = 0;
1293 char *bn;
1294
1295 assert(i);
1296 assert(path);
1297 assert(i->type == CREATE_FILE);
1298
1299 /* 'f' operates on regular files exclusively. */
1300
1301 /* Validate the path and keep the fd on the directory for opening the
1302 * file so we're sure that it can't be changed behind our back. */
1303 dir_fd = path_open_parent_safe(path);
1304 if (dir_fd < 0)
1305 return dir_fd;
1306
1307 bn = basename(path);
1308
1309 RUN_WITH_UMASK(0000) {
1310 mac_selinux_create_file_prepare(path, S_IFREG);
1311 fd = openat(dir_fd, bn, O_CREAT|O_EXCL|O_NOFOLLOW|O_NONBLOCK|O_CLOEXEC|O_WRONLY|O_NOCTTY, i->mode);
1312 mac_selinux_create_file_clear();
1313 }
1314
1315 if (fd < 0) {
1316 /* Even on a read-only filesystem, open(2) returns EEXIST if the
1317 * file already exists. It returns EROFS only if it needs to
1318 * create the file. */
1319 if (errno != EEXIST)
1320 return log_error_errno(errno, "Failed to create file %s: %m", path);
1321
1322 /* Re-open the file. At that point it must exist since open(2)
1323 * failed with EEXIST. We still need to check if the perms/mode
1324 * need to be changed. For read-only filesystems, we let
1325 * fd_set_perms() report the error if the perms need to be
1326 * modified. */
1327 fd = openat(dir_fd, bn, O_NOFOLLOW|O_CLOEXEC|O_PATH, i->mode);
1328 if (fd < 0)
1329 return log_error_errno(errno, "Failed to re-open file %s: %m", path);
1330
1331 if (fstat(fd, &stbuf) < 0)
1332 return log_error_errno(errno, "stat(%s) failed: %m", path);
1333
1334 if (!S_ISREG(stbuf.st_mode)) {
1335 log_error("%s exists and is not a regular file.", path);
1336 return -EEXIST;
1337 }
1338
1339 st = &stbuf;
1340 } else {
1341
1342 log_debug("\"%s\" has been created.", path);
1343
1344 if (i->argument) {
1345 log_debug("Writing to \"%s\".", path);
1346
1347 r = loop_write(fd, i->argument, strlen(i->argument), false);
1348 if (r < 0)
1349 return log_error_errno(r, "Failed to write file \"%s\": %m", path);
1350 }
1351 }
1352
1353 return fd_set_perms(i, fd, path, st);
1354 }
1355
1356 static int truncate_file(Item *i, const char *path) {
1357 _cleanup_close_ int fd = -1, dir_fd = -1;
1358 struct stat stbuf, *st = NULL;
1359 bool erofs = false;
1360 int r = 0;
1361 char *bn;
1362
1363 assert(i);
1364 assert(path);
1365 assert(i->type == TRUNCATE_FILE);
1366
1367 /* We want to operate on regular file exclusively especially since
1368 * O_TRUNC is unspecified if the file is neither a regular file nor a
1369 * fifo nor a terminal device. Therefore we first open the file and make
1370 * sure it's a regular one before truncating it. */
1371
1372 /* Validate the path and keep the fd on the directory for opening the
1373 * file so we're sure that it can't be changed behind our back. */
1374 dir_fd = path_open_parent_safe(path);
1375 if (dir_fd < 0)
1376 return dir_fd;
1377
1378 bn = basename(path);
1379
1380 RUN_WITH_UMASK(0000) {
1381 mac_selinux_create_file_prepare(path, S_IFREG);
1382 fd = openat(dir_fd, bn, O_CREAT|O_NOFOLLOW|O_NONBLOCK|O_CLOEXEC|O_WRONLY|O_NOCTTY, i->mode);
1383 mac_selinux_create_file_clear();
1384 }
1385
1386 if (fd < 0) {
1387 if (errno != EROFS)
1388 return log_error_errno(errno, "Failed to open/create file %s: %m", path);
1389
1390 /* On a read-only filesystem, we don't want to fail if the
1391 * target is already empty and the perms are set. So we still
1392 * proceed with the sanity checks and let the remaining
1393 * operations fail with EROFS if they try to modify the target
1394 * file. */
1395
1396 fd = openat(dir_fd, bn, O_NOFOLLOW|O_CLOEXEC|O_PATH, i->mode);
1397 if (fd < 0) {
1398 if (errno == ENOENT) {
1399 log_error("Cannot create file %s on a read-only file system.", path);
1400 return -EROFS;
1401 }
1402
1403 return log_error_errno(errno, "Failed to re-open file %s: %m", path);
1404 }
1405
1406 erofs = true;
1407 }
1408
1409 if (fstat(fd, &stbuf) < 0)
1410 return log_error_errno(errno, "stat(%s) failed: %m", path);
1411
1412 if (!S_ISREG(stbuf.st_mode)) {
1413 log_error("%s exists and is not a regular file.", path);
1414 return -EEXIST;
1415 }
1416
1417 if (stbuf.st_size > 0) {
1418 if (ftruncate(fd, 0) < 0) {
1419 r = erofs ? -EROFS : -errno;
1420 return log_error_errno(r, "Failed to truncate file %s: %m", path);
1421 }
1422 } else
1423 st = &stbuf;
1424
1425 log_debug("\"%s\" has been created.", path);
1426
1427 if (i->argument) {
1428 log_debug("Writing to \"%s\".", path);
1429
1430 r = loop_write(fd, i->argument, strlen(i->argument), false);
1431 if (r < 0) {
1432 r = erofs ? -EROFS : r;
1433 return log_error_errno(r, "Failed to write file %s: %m", path);
1434 }
1435 }
1436
1437 return fd_set_perms(i, fd, path, st);
1438 }
1439
1440 static int copy_files(Item *i) {
1441 _cleanup_close_ int dfd = -1, fd = -1;
1442 char *bn;
1443 int r;
1444
1445 log_debug("Copying tree \"%s\" to \"%s\".", i->argument, i->path);
1446
1447 bn = basename(i->path);
1448
1449 /* Validate the path and use the returned directory fd for copying the
1450 * target so we're sure that the path can't be changed behind our
1451 * back. */
1452 dfd = path_open_parent_safe(i->path);
1453 if (dfd < 0)
1454 return dfd;
1455
1456 r = copy_tree_at(AT_FDCWD, i->argument,
1457 dfd, bn,
1458 i->uid_set ? i->uid : UID_INVALID,
1459 i->gid_set ? i->gid : GID_INVALID,
1460 COPY_REFLINK | COPY_MERGE_EMPTY);
1461 if (r < 0) {
1462 struct stat a, b;
1463
1464 /* If the target already exists on read-only filesystems, trying
1465 * to create the target will not fail with EEXIST but with
1466 * EROFS. */
1467 if (r == -EROFS && faccessat(dfd, bn, F_OK, AT_SYMLINK_NOFOLLOW) == 0)
1468 r = -EEXIST;
1469
1470 if (r != -EEXIST)
1471 return log_error_errno(r, "Failed to copy files to %s: %m", i->path);
1472
1473 if (stat(i->argument, &a) < 0)
1474 return log_error_errno(errno, "stat(%s) failed: %m", i->argument);
1475
1476 if (fstatat(dfd, bn, &b, AT_SYMLINK_NOFOLLOW) < 0)
1477 return log_error_errno(errno, "stat(%s) failed: %m", i->path);
1478
1479 if ((a.st_mode ^ b.st_mode) & S_IFMT) {
1480 log_debug("Can't copy to %s, file exists already and is of different type", i->path);
1481 return 0;
1482 }
1483 }
1484
1485 fd = openat(dfd, bn, O_NOFOLLOW|O_CLOEXEC|O_PATH);
1486 if (fd < 0)
1487 return log_error_errno(errno, "Failed to openat(%s): %m", i->path);
1488
1489 return fd_set_perms(i, fd, i->path, NULL);
1490 }
1491
1492 typedef enum {
1493 CREATION_NORMAL,
1494 CREATION_EXISTING,
1495 CREATION_FORCE,
1496 _CREATION_MODE_MAX,
1497 _CREATION_MODE_INVALID = -1
1498 } CreationMode;
1499
1500 static const char *const creation_mode_verb_table[_CREATION_MODE_MAX] = {
1501 [CREATION_NORMAL] = "Created",
1502 [CREATION_EXISTING] = "Found existing",
1503 [CREATION_FORCE] = "Created replacement",
1504 };
1505
1506 DEFINE_PRIVATE_STRING_TABLE_LOOKUP_TO_STRING(creation_mode_verb, CreationMode);
1507
1508 static int create_directory_or_subvolume(const char *path, mode_t mode, bool subvol, CreationMode *creation) {
1509 _cleanup_close_ int pfd = -1;
1510 CreationMode c;
1511 int r;
1512
1513 assert(path);
1514
1515 if (!creation)
1516 creation = &c;
1517
1518 pfd = path_open_parent_safe(path);
1519 if (pfd < 0)
1520 return pfd;
1521
1522 if (subvol) {
1523 if (btrfs_is_subvol(empty_to_root(arg_root)) <= 0)
1524
1525 /* Don't create a subvolume unless the root directory is
1526 * one, too. We do this under the assumption that if the
1527 * root directory is just a plain directory (i.e. very
1528 * light-weight), we shouldn't try to split it up into
1529 * subvolumes (i.e. more heavy-weight). Thus, chroot()
1530 * environments and suchlike will get a full brtfs
1531 * subvolume set up below their tree only if they
1532 * specifically set up a btrfs subvolume for the root
1533 * dir too. */
1534
1535 subvol = false;
1536 else {
1537 RUN_WITH_UMASK((~mode) & 0777)
1538 r = btrfs_subvol_make_fd(pfd, basename(path));
1539 }
1540 } else
1541 r = 0;
1542
1543 if (!subvol || r == -ENOTTY)
1544 RUN_WITH_UMASK(0000)
1545 r = mkdirat_label(pfd, basename(path), mode);
1546
1547 if (r < 0) {
1548 int k;
1549
1550 if (!IN_SET(r, -EEXIST, -EROFS))
1551 return log_error_errno(r, "Failed to create directory or subvolume \"%s\": %m", path);
1552
1553 k = is_dir_fd(pfd);
1554 if (k == -ENOENT && r == -EROFS)
1555 return log_error_errno(r, "%s does not exist and cannot be created as the file system is read-only.", path);
1556 if (k < 0)
1557 return log_error_errno(k, "Failed to check if %s exists: %m", path);
1558 if (!k) {
1559 log_warning("\"%s\" already exists and is not a directory.", path);
1560 return -EEXIST;
1561 }
1562
1563 *creation = CREATION_EXISTING;
1564 } else
1565 *creation = CREATION_NORMAL;
1566
1567 log_debug("%s directory \"%s\".", creation_mode_verb_to_string(*creation), path);
1568
1569 r = openat(pfd, basename(path), O_NOCTTY|O_CLOEXEC|O_DIRECTORY);
1570 if (r < 0)
1571 return log_error_errno(errno, "Failed to open directory '%s': %m", basename(path));
1572
1573 return r;
1574 }
1575
1576 static int create_directory(Item *i, const char *path) {
1577 _cleanup_close_ int fd = -1;
1578
1579 assert(i);
1580 assert(IN_SET(i->type, CREATE_DIRECTORY, TRUNCATE_DIRECTORY));
1581
1582 fd = create_directory_or_subvolume(path, i->mode, false, NULL);
1583 if (fd == -EEXIST)
1584 return 0;
1585 if (fd < 0)
1586 return fd;
1587
1588 return fd_set_perms(i, fd, path, NULL);
1589 }
1590
1591 static int create_subvolume(Item *i, const char *path) {
1592 _cleanup_close_ int fd = -1;
1593 CreationMode creation;
1594 int r, q = 0;
1595
1596 assert(i);
1597 assert(IN_SET(i->type, CREATE_SUBVOLUME, CREATE_SUBVOLUME_NEW_QUOTA, CREATE_SUBVOLUME_INHERIT_QUOTA));
1598
1599 fd = create_directory_or_subvolume(path, i->mode, true, &creation);
1600 if (fd == -EEXIST)
1601 return 0;
1602 if (fd < 0)
1603 return fd;
1604
1605 if (creation == CREATION_NORMAL &&
1606 IN_SET(i->type, CREATE_SUBVOLUME_NEW_QUOTA, CREATE_SUBVOLUME_INHERIT_QUOTA)) {
1607 r = btrfs_subvol_auto_qgroup_fd(fd, 0, i->type == CREATE_SUBVOLUME_NEW_QUOTA);
1608 if (r == -ENOTTY)
1609 log_debug_errno(r, "Couldn't adjust quota for subvolume \"%s\" (unsupported fs or dir not a subvolume): %m", i->path);
1610 else if (r == -EROFS)
1611 log_debug_errno(r, "Couldn't adjust quota for subvolume \"%s\" (fs is read-only).", i->path);
1612 else if (r == -ENOPROTOOPT)
1613 log_debug_errno(r, "Couldn't adjust quota for subvolume \"%s\" (quota support is disabled).", i->path);
1614 else if (r < 0)
1615 q = log_error_errno(r, "Failed to adjust quota for subvolume \"%s\": %m", i->path);
1616 else if (r > 0)
1617 log_debug("Adjusted quota for subvolume \"%s\".", i->path);
1618 else if (r == 0)
1619 log_debug("Quota for subvolume \"%s\" already in place, no change made.", i->path);
1620 }
1621
1622 r = fd_set_perms(i, fd, path, NULL);
1623 if (q < 0) /* prefer the quota change error from above */
1624 return q;
1625
1626 return r;
1627 }
1628
1629 static int empty_directory(Item *i, const char *path) {
1630 int r;
1631
1632 assert(i);
1633 assert(i->type == EMPTY_DIRECTORY);
1634
1635 r = is_dir(path, false);
1636 if (r == -ENOENT) {
1637 /* Option "e" operates only on existing objects. Do not
1638 * print errors about non-existent files or directories */
1639 log_debug("Skipping missing directory: %s", path);
1640 return 0;
1641 }
1642 if (r < 0)
1643 return log_error_errno(r, "is_dir() failed on path %s: %m", path);
1644 if (r == 0)
1645 return log_error_errno(SYNTHETIC_ERRNO(EEXIST),
1646 "'%s' already exists and is not a directory.",
1647 path);
1648
1649 return path_set_perms(i, path);
1650 }
1651
1652 static int create_device(Item *i, mode_t file_type) {
1653 _cleanup_close_ int dfd = -1, fd = -1;
1654 CreationMode creation;
1655 char *bn;
1656 int r;
1657
1658 assert(i);
1659 assert(IN_SET(file_type, S_IFBLK, S_IFCHR));
1660
1661 bn = basename(i->path);
1662
1663 /* Validate the path and use the returned directory fd for copying the
1664 * target so we're sure that the path can't be changed behind our
1665 * back. */
1666 dfd = path_open_parent_safe(i->path);
1667 if (dfd < 0)
1668 return dfd;
1669
1670 RUN_WITH_UMASK(0000) {
1671 mac_selinux_create_file_prepare(i->path, file_type);
1672 r = mknodat(dfd, bn, i->mode | file_type, i->major_minor);
1673 mac_selinux_create_file_clear();
1674 }
1675
1676 if (r < 0) {
1677 struct stat st;
1678
1679 if (errno == EPERM) {
1680 log_debug("We lack permissions, possibly because of cgroup configuration; "
1681 "skipping creation of device node %s.", i->path);
1682 return 0;
1683 }
1684
1685 if (errno != EEXIST)
1686 return log_error_errno(errno, "Failed to create device node %s: %m", i->path);
1687
1688 if (fstatat(dfd, bn, &st, 0) < 0)
1689 return log_error_errno(errno, "stat(%s) failed: %m", i->path);
1690
1691 if ((st.st_mode & S_IFMT) != file_type) {
1692
1693 if (i->force) {
1694
1695 RUN_WITH_UMASK(0000) {
1696 mac_selinux_create_file_prepare(i->path, file_type);
1697 /* FIXME: need to introduce mknodat_atomic() */
1698 r = mknod_atomic(i->path, i->mode | file_type, i->major_minor);
1699 mac_selinux_create_file_clear();
1700 }
1701
1702 if (r < 0)
1703 return log_error_errno(r, "Failed to create device node \"%s\": %m", i->path);
1704 creation = CREATION_FORCE;
1705 } else {
1706 log_debug("%s is not a device node.", i->path);
1707 return 0;
1708 }
1709 } else
1710 creation = CREATION_EXISTING;
1711 } else
1712 creation = CREATION_NORMAL;
1713
1714 log_debug("%s %s device node \"%s\" %u:%u.",
1715 creation_mode_verb_to_string(creation),
1716 i->type == CREATE_BLOCK_DEVICE ? "block" : "char",
1717 i->path, major(i->mode), minor(i->mode));
1718
1719 fd = openat(dfd, bn, O_NOFOLLOW|O_CLOEXEC|O_PATH);
1720 if (fd < 0)
1721 return log_error_errno(errno, "Failed to openat(%s): %m", i->path);
1722
1723 return fd_set_perms(i, fd, i->path, NULL);
1724 }
1725
1726 static int create_fifo(Item *i, const char *path) {
1727 _cleanup_close_ int pfd = -1, fd = -1;
1728 CreationMode creation;
1729 struct stat st;
1730 char *bn;
1731 int r;
1732
1733 pfd = path_open_parent_safe(path);
1734 if (pfd < 0)
1735 return pfd;
1736
1737 bn = basename(path);
1738
1739 RUN_WITH_UMASK(0000) {
1740 mac_selinux_create_file_prepare(path, S_IFIFO);
1741 r = mkfifoat(pfd, bn, i->mode);
1742 mac_selinux_create_file_clear();
1743 }
1744
1745 if (r < 0) {
1746 if (errno != EEXIST)
1747 return log_error_errno(errno, "Failed to create fifo %s: %m", path);
1748
1749 if (fstatat(pfd, bn, &st, AT_SYMLINK_NOFOLLOW) < 0)
1750 return log_error_errno(errno, "stat(%s) failed: %m", path);
1751
1752 if (!S_ISFIFO(st.st_mode)) {
1753
1754 if (i->force) {
1755 RUN_WITH_UMASK(0000) {
1756 mac_selinux_create_file_prepare(path, S_IFIFO);
1757 r = mkfifoat_atomic(pfd, bn, i->mode);
1758 mac_selinux_create_file_clear();
1759 }
1760
1761 if (r < 0)
1762 return log_error_errno(r, "Failed to create fifo %s: %m", path);
1763 creation = CREATION_FORCE;
1764 } else {
1765 log_warning("\"%s\" already exists and is not a fifo.", path);
1766 return 0;
1767 }
1768 } else
1769 creation = CREATION_EXISTING;
1770 } else
1771 creation = CREATION_NORMAL;
1772
1773 log_debug("%s fifo \"%s\".", creation_mode_verb_to_string(creation), path);
1774
1775 fd = openat(pfd, bn, O_NOFOLLOW|O_CLOEXEC|O_PATH);
1776 if (fd < 0)
1777 return log_error_errno(errno, "Failed to openat(%s): %m", path);
1778
1779 return fd_set_perms(i, fd, i->path, NULL);
1780 }
1781
1782 typedef int (*action_t)(Item *i, const char *path);
1783 typedef int (*fdaction_t)(Item *i, int fd, const char *path, const struct stat *st);
1784
1785 static int item_do(Item *i, int fd, const char *path, fdaction_t action) {
1786 struct stat st;
1787 int r = 0, q;
1788
1789 assert(i);
1790 assert(path);
1791 assert(fd >= 0);
1792
1793 if (fstat(fd, &st) < 0) {
1794 r = log_error_errno(errno, "fstat() on file failed: %m");
1795 goto finish;
1796 }
1797
1798 /* This returns the first error we run into, but nevertheless
1799 * tries to go on */
1800 r = action(i, fd, path, &st);
1801
1802 if (S_ISDIR(st.st_mode)) {
1803 char procfs_path[STRLEN("/proc/self/fd/") + DECIMAL_STR_MAX(int)];
1804 _cleanup_closedir_ DIR *d = NULL;
1805 struct dirent *de;
1806
1807 /* The passed 'fd' was opened with O_PATH. We need to convert
1808 * it into a 'regular' fd before reading the directory content. */
1809 xsprintf(procfs_path, "/proc/self/fd/%i", fd);
1810
1811 d = opendir(procfs_path);
1812 if (!d) {
1813 log_error_errno(errno, "Failed to opendir() '%s': %m", procfs_path);
1814 if (r == 0)
1815 r = -errno;
1816 goto finish;
1817 }
1818
1819 FOREACH_DIRENT_ALL(de, d, q = -errno; goto finish) {
1820 int de_fd;
1821
1822 if (dot_or_dot_dot(de->d_name))
1823 continue;
1824
1825 de_fd = openat(fd, de->d_name, O_NOFOLLOW|O_CLOEXEC|O_PATH);
1826 if (de_fd < 0)
1827 q = log_error_errno(errno, "Failed to open() file '%s': %m", de->d_name);
1828 else {
1829 _cleanup_free_ char *de_path = NULL;
1830
1831 de_path = path_join(path, de->d_name);
1832 if (!de_path)
1833 q = log_oom();
1834 else
1835 /* Pass ownership of dirent fd over */
1836 q = item_do(i, de_fd, de_path, action);
1837 }
1838
1839 if (q < 0 && r == 0)
1840 r = q;
1841 }
1842 }
1843 finish:
1844 safe_close(fd);
1845 return r;
1846 }
1847
1848 static int glob_item(Item *i, action_t action) {
1849 _cleanup_globfree_ glob_t g = {
1850 .gl_opendir = (void *(*)(const char *)) opendir_nomod,
1851 };
1852 int r = 0, k;
1853 char **fn;
1854
1855 k = safe_glob(i->path, GLOB_NOSORT|GLOB_BRACE, &g);
1856 if (k < 0 && k != -ENOENT)
1857 return log_error_errno(k, "glob(%s) failed: %m", i->path);
1858
1859 STRV_FOREACH(fn, g.gl_pathv) {
1860 k = action(i, *fn);
1861 if (k < 0 && r == 0)
1862 r = k;
1863 }
1864
1865 return r;
1866 }
1867
1868 static int glob_item_recursively(Item *i, fdaction_t action) {
1869 _cleanup_globfree_ glob_t g = {
1870 .gl_opendir = (void *(*)(const char *)) opendir_nomod,
1871 };
1872 int r = 0, k;
1873 char **fn;
1874
1875 k = safe_glob(i->path, GLOB_NOSORT|GLOB_BRACE, &g);
1876 if (k < 0 && k != -ENOENT)
1877 return log_error_errno(k, "glob(%s) failed: %m", i->path);
1878
1879 STRV_FOREACH(fn, g.gl_pathv) {
1880 _cleanup_close_ int fd = -1;
1881
1882 /* Make sure we won't trigger/follow file object (such as
1883 * device nodes, automounts, ...) pointed out by 'fn' with
1884 * O_PATH. Note, when O_PATH is used, flags other than
1885 * O_CLOEXEC, O_DIRECTORY, and O_NOFOLLOW are ignored. */
1886
1887 fd = open(*fn, O_CLOEXEC|O_NOFOLLOW|O_PATH);
1888 if (fd < 0) {
1889 log_error_errno(errno, "Opening '%s' failed: %m", *fn);
1890 if (r == 0)
1891 r = -errno;
1892 continue;
1893 }
1894
1895 k = item_do(i, fd, *fn, action);
1896 if (k < 0 && r == 0)
1897 r = k;
1898
1899 /* we passed fd ownership to the previous call */
1900 fd = -1;
1901 }
1902
1903 return r;
1904 }
1905
1906 static int create_item(Item *i) {
1907 CreationMode creation;
1908 int r = 0;
1909
1910 assert(i);
1911
1912 log_debug("Running create action for entry %c %s", (char) i->type, i->path);
1913
1914 switch (i->type) {
1915
1916 case IGNORE_PATH:
1917 case IGNORE_DIRECTORY_PATH:
1918 case REMOVE_PATH:
1919 case RECURSIVE_REMOVE_PATH:
1920 return 0;
1921
1922 case CREATE_FILE:
1923 RUN_WITH_UMASK(0000)
1924 (void) mkdir_parents_label(i->path, 0755);
1925
1926 r = create_file(i, i->path);
1927 if (r < 0)
1928 return r;
1929 break;
1930
1931 case TRUNCATE_FILE:
1932 RUN_WITH_UMASK(0000)
1933 (void) mkdir_parents_label(i->path, 0755);
1934
1935 r = truncate_file(i, i->path);
1936 if (r < 0)
1937 return r;
1938 break;
1939
1940 case COPY_FILES:
1941 RUN_WITH_UMASK(0000)
1942 (void) mkdir_parents_label(i->path, 0755);
1943
1944 r = copy_files(i);
1945 if (r < 0)
1946 return r;
1947 break;
1948
1949 case WRITE_FILE:
1950 r = glob_item(i, write_one_file);
1951 if (r < 0)
1952 return r;
1953
1954 break;
1955
1956 case CREATE_DIRECTORY:
1957 case TRUNCATE_DIRECTORY:
1958 RUN_WITH_UMASK(0000)
1959 (void) mkdir_parents_label(i->path, 0755);
1960
1961 r = create_directory(i, i->path);
1962 if (r < 0)
1963 return r;
1964 break;
1965
1966 case CREATE_SUBVOLUME:
1967 case CREATE_SUBVOLUME_INHERIT_QUOTA:
1968 case CREATE_SUBVOLUME_NEW_QUOTA:
1969 RUN_WITH_UMASK(0000)
1970 (void) mkdir_parents_label(i->path, 0755);
1971
1972 r = create_subvolume(i, i->path);
1973 if (r < 0)
1974 return r;
1975 break;
1976
1977 case EMPTY_DIRECTORY:
1978 r = glob_item(i, empty_directory);
1979 if (r < 0)
1980 return r;
1981 break;
1982
1983 case CREATE_FIFO:
1984 RUN_WITH_UMASK(0000)
1985 (void) mkdir_parents_label(i->path, 0755);
1986
1987 r = create_fifo(i, i->path);
1988 if (r < 0)
1989 return r;
1990 break;
1991
1992 case CREATE_SYMLINK: {
1993 RUN_WITH_UMASK(0000)
1994 (void) mkdir_parents_label(i->path, 0755);
1995
1996 mac_selinux_create_file_prepare(i->path, S_IFLNK);
1997 r = symlink(i->argument, i->path);
1998 mac_selinux_create_file_clear();
1999
2000 if (r < 0) {
2001 _cleanup_free_ char *x = NULL;
2002
2003 if (errno != EEXIST)
2004 return log_error_errno(errno, "symlink(%s, %s) failed: %m", i->argument, i->path);
2005
2006 r = readlink_malloc(i->path, &x);
2007 if (r < 0 || !streq(i->argument, x)) {
2008
2009 if (i->force) {
2010 mac_selinux_create_file_prepare(i->path, S_IFLNK);
2011 r = symlink_atomic(i->argument, i->path);
2012 mac_selinux_create_file_clear();
2013
2014 if (IN_SET(r, -EISDIR, -EEXIST, -ENOTEMPTY)) {
2015 r = rm_rf(i->path, REMOVE_ROOT|REMOVE_PHYSICAL);
2016 if (r < 0)
2017 return log_error_errno(r, "rm -fr %s failed: %m", i->path);
2018
2019 mac_selinux_create_file_prepare(i->path, S_IFLNK);
2020 r = symlink(i->argument, i->path) < 0 ? -errno : 0;
2021 mac_selinux_create_file_clear();
2022 }
2023 if (r < 0)
2024 return log_error_errno(r, "symlink(%s, %s) failed: %m", i->argument, i->path);
2025
2026 creation = CREATION_FORCE;
2027 } else {
2028 log_debug("\"%s\" is not a symlink or does not point to the correct path.", i->path);
2029 return 0;
2030 }
2031 } else
2032 creation = CREATION_EXISTING;
2033 } else
2034
2035 creation = CREATION_NORMAL;
2036 log_debug("%s symlink \"%s\".", creation_mode_verb_to_string(creation), i->path);
2037 break;
2038 }
2039
2040 case CREATE_BLOCK_DEVICE:
2041 case CREATE_CHAR_DEVICE:
2042 if (have_effective_cap(CAP_MKNOD) == 0) {
2043 /* In a container we lack CAP_MKNOD. We shouldn't attempt to create the device node in that
2044 * case to avoid noise, and we don't support virtualized devices in containers anyway. */
2045
2046 log_debug("We lack CAP_MKNOD, skipping creation of device node %s.", i->path);
2047 return 0;
2048 }
2049
2050 RUN_WITH_UMASK(0000)
2051 (void) mkdir_parents_label(i->path, 0755);
2052
2053 r = create_device(i, i->type == CREATE_BLOCK_DEVICE ? S_IFBLK : S_IFCHR);
2054 if (r < 0)
2055 return r;
2056
2057 break;
2058
2059 case ADJUST_MODE:
2060 case RELABEL_PATH:
2061 r = glob_item(i, path_set_perms);
2062 if (r < 0)
2063 return r;
2064 break;
2065
2066 case RECURSIVE_RELABEL_PATH:
2067 r = glob_item_recursively(i, fd_set_perms);
2068 if (r < 0)
2069 return r;
2070 break;
2071
2072 case SET_XATTR:
2073 r = glob_item(i, path_set_xattrs);
2074 if (r < 0)
2075 return r;
2076 break;
2077
2078 case RECURSIVE_SET_XATTR:
2079 r = glob_item_recursively(i, fd_set_xattrs);
2080 if (r < 0)
2081 return r;
2082 break;
2083
2084 case SET_ACL:
2085 r = glob_item(i, path_set_acls);
2086 if (r < 0)
2087 return r;
2088 break;
2089
2090 case RECURSIVE_SET_ACL:
2091 r = glob_item_recursively(i, fd_set_acls);
2092 if (r < 0)
2093 return r;
2094 break;
2095
2096 case SET_ATTRIBUTE:
2097 r = glob_item(i, path_set_attribute);
2098 if (r < 0)
2099 return r;
2100 break;
2101
2102 case RECURSIVE_SET_ATTRIBUTE:
2103 r = glob_item_recursively(i, fd_set_attribute);
2104 if (r < 0)
2105 return r;
2106 break;
2107 }
2108
2109 return 0;
2110 }
2111
2112 static int remove_item_instance(Item *i, const char *instance) {
2113 int r;
2114
2115 assert(i);
2116
2117 switch (i->type) {
2118
2119 case REMOVE_PATH:
2120 if (remove(instance) < 0 && errno != ENOENT)
2121 return log_error_errno(errno, "rm(%s): %m", instance);
2122
2123 break;
2124
2125 case RECURSIVE_REMOVE_PATH:
2126 /* FIXME: we probably should use dir_cleanup() here instead of rm_rf() so that 'x' is honoured. */
2127 log_debug("rm -rf \"%s\"", instance);
2128 r = rm_rf(instance, REMOVE_ROOT|REMOVE_SUBVOLUME|REMOVE_PHYSICAL);
2129 if (r < 0 && r != -ENOENT)
2130 return log_error_errno(r, "rm_rf(%s): %m", instance);
2131
2132 break;
2133
2134 default:
2135 assert_not_reached("wut?");
2136 }
2137
2138 return 0;
2139 }
2140
2141 static int remove_item(Item *i) {
2142 int r;
2143
2144 assert(i);
2145
2146 log_debug("Running remove action for entry %c %s", (char) i->type, i->path);
2147
2148 switch (i->type) {
2149
2150 case TRUNCATE_DIRECTORY:
2151 /* FIXME: we probably should use dir_cleanup() here instead of rm_rf() so that 'x' is honoured. */
2152 log_debug("rm -rf \"%s\"", i->path);
2153 r = rm_rf(i->path, REMOVE_PHYSICAL);
2154 if (r < 0 && r != -ENOENT)
2155 return log_error_errno(r, "rm_rf(%s): %m", i->path);
2156
2157 return 0;
2158
2159 case REMOVE_PATH:
2160 case RECURSIVE_REMOVE_PATH:
2161 return glob_item(i, remove_item_instance);
2162
2163 default:
2164 return 0;
2165 }
2166 }
2167
2168 static int clean_item_instance(Item *i, const char* instance) {
2169 _cleanup_closedir_ DIR *d = NULL;
2170 struct stat s, ps;
2171 bool mountpoint;
2172 usec_t cutoff, n;
2173 char timestamp[FORMAT_TIMESTAMP_MAX];
2174
2175 assert(i);
2176
2177 if (!i->age_set)
2178 return 0;
2179
2180 n = now(CLOCK_REALTIME);
2181 if (n < i->age)
2182 return 0;
2183
2184 cutoff = n - i->age;
2185
2186 d = opendir_nomod(instance);
2187 if (!d) {
2188 if (IN_SET(errno, ENOENT, ENOTDIR)) {
2189 log_debug_errno(errno, "Directory \"%s\": %m", instance);
2190 return 0;
2191 }
2192
2193 return log_error_errno(errno, "Failed to open directory %s: %m", instance);
2194 }
2195
2196 if (fstat(dirfd(d), &s) < 0)
2197 return log_error_errno(errno, "stat(%s) failed: %m", i->path);
2198
2199 if (!S_ISDIR(s.st_mode))
2200 return log_error_errno(SYNTHETIC_ERRNO(ENOTDIR),
2201 "%s is not a directory.", i->path);
2202
2203 if (fstatat(dirfd(d), "..", &ps, AT_SYMLINK_NOFOLLOW) != 0)
2204 return log_error_errno(errno, "stat(%s/..) failed: %m", i->path);
2205
2206 mountpoint = s.st_dev != ps.st_dev || s.st_ino == ps.st_ino;
2207
2208 log_debug("Cleanup threshold for %s \"%s\" is %s",
2209 mountpoint ? "mount point" : "directory",
2210 instance,
2211 format_timestamp_us(timestamp, sizeof(timestamp), cutoff));
2212
2213 return dir_cleanup(i, instance, d, &s, cutoff, s.st_dev, mountpoint,
2214 MAX_DEPTH, i->keep_first_level);
2215 }
2216
2217 static int clean_item(Item *i) {
2218 assert(i);
2219
2220 log_debug("Running clean action for entry %c %s", (char) i->type, i->path);
2221
2222 switch (i->type) {
2223 case CREATE_DIRECTORY:
2224 case CREATE_SUBVOLUME:
2225 case CREATE_SUBVOLUME_INHERIT_QUOTA:
2226 case CREATE_SUBVOLUME_NEW_QUOTA:
2227 case TRUNCATE_DIRECTORY:
2228 case IGNORE_PATH:
2229 case COPY_FILES:
2230 clean_item_instance(i, i->path);
2231 return 0;
2232 case EMPTY_DIRECTORY:
2233 case IGNORE_DIRECTORY_PATH:
2234 return glob_item(i, clean_item_instance);
2235 default:
2236 return 0;
2237 }
2238 }
2239
2240 static int process_item(Item *i, OperationMask operation) {
2241 OperationMask todo;
2242 int r, q, p;
2243
2244 assert(i);
2245
2246 todo = operation & ~i->done;
2247 if (todo == 0) /* Everything already done? */
2248 return 0;
2249
2250 i->done |= operation;
2251
2252 r = chase_symlinks(i->path, arg_root, CHASE_NO_AUTOFS|CHASE_WARN, NULL);
2253 if (r == -EREMOTE) {
2254 log_notice_errno(r, "Skipping %s", i->path);
2255 return 0;
2256 }
2257 if (r < 0)
2258 log_debug_errno(r, "Failed to determine whether '%s' is below autofs, ignoring: %m", i->path);
2259
2260 r = FLAGS_SET(operation, OPERATION_CREATE) ? create_item(i) : 0;
2261 /* Failure can only be tolerated for create */
2262 if (i->allow_failure)
2263 r = 0;
2264
2265 q = FLAGS_SET(operation, OPERATION_REMOVE) ? remove_item(i) : 0;
2266 p = FLAGS_SET(operation, OPERATION_CLEAN) ? clean_item(i) : 0;
2267
2268 return r < 0 ? r :
2269 q < 0 ? q :
2270 p;
2271 }
2272
2273 static int process_item_array(ItemArray *array, OperationMask operation) {
2274 int r = 0;
2275 size_t n;
2276
2277 assert(array);
2278
2279 /* Create any parent first. */
2280 if (FLAGS_SET(operation, OPERATION_CREATE) && array->parent)
2281 r = process_item_array(array->parent, operation & OPERATION_CREATE);
2282
2283 /* Clean up all children first */
2284 if ((operation & (OPERATION_REMOVE|OPERATION_CLEAN)) && !set_isempty(array->children)) {
2285 Iterator i;
2286 ItemArray *c;
2287
2288 SET_FOREACH(c, array->children, i) {
2289 int k;
2290
2291 k = process_item_array(c, operation & (OPERATION_REMOVE|OPERATION_CLEAN));
2292 if (k < 0 && r == 0)
2293 r = k;
2294 }
2295 }
2296
2297 for (n = 0; n < array->n_items; n++) {
2298 int k;
2299
2300 k = process_item(array->items + n, operation);
2301 if (k < 0 && r == 0)
2302 r = k;
2303 }
2304
2305 return r;
2306 }
2307
2308 static void item_free_contents(Item *i) {
2309 assert(i);
2310 free(i->path);
2311 free(i->argument);
2312 strv_free(i->xattrs);
2313
2314 #if HAVE_ACL
2315 acl_free(i->acl_access);
2316 acl_free(i->acl_default);
2317 #endif
2318 }
2319
2320 static ItemArray* item_array_free(ItemArray *a) {
2321 size_t n;
2322
2323 if (!a)
2324 return NULL;
2325
2326 for (n = 0; n < a->n_items; n++)
2327 item_free_contents(a->items + n);
2328
2329 set_free(a->children);
2330 free(a->items);
2331 return mfree(a);
2332 }
2333
2334 static int item_compare(const Item *a, const Item *b) {
2335 /* Make sure that the ownership taking item is put first, so
2336 * that we first create the node, and then can adjust it */
2337
2338 if (takes_ownership(a->type) && !takes_ownership(b->type))
2339 return -1;
2340 if (!takes_ownership(a->type) && takes_ownership(b->type))
2341 return 1;
2342
2343 return CMP(a->type, b->type);
2344 }
2345
2346 static bool item_compatible(Item *a, Item *b) {
2347 assert(a);
2348 assert(b);
2349 assert(streq(a->path, b->path));
2350
2351 if (takes_ownership(a->type) && takes_ownership(b->type))
2352 /* check if the items are the same */
2353 return streq_ptr(a->argument, b->argument) &&
2354
2355 a->uid_set == b->uid_set &&
2356 a->uid == b->uid &&
2357
2358 a->gid_set == b->gid_set &&
2359 a->gid == b->gid &&
2360
2361 a->mode_set == b->mode_set &&
2362 a->mode == b->mode &&
2363
2364 a->age_set == b->age_set &&
2365 a->age == b->age &&
2366
2367 a->mask_perms == b->mask_perms &&
2368
2369 a->keep_first_level == b->keep_first_level &&
2370
2371 a->major_minor == b->major_minor;
2372
2373 return true;
2374 }
2375
2376 static bool should_include_path(const char *path) {
2377 char **prefix;
2378
2379 STRV_FOREACH(prefix, arg_exclude_prefixes)
2380 if (path_startswith(path, *prefix)) {
2381 log_debug("Entry \"%s\" matches exclude prefix \"%s\", skipping.",
2382 path, *prefix);
2383 return false;
2384 }
2385
2386 STRV_FOREACH(prefix, arg_include_prefixes)
2387 if (path_startswith(path, *prefix)) {
2388 log_debug("Entry \"%s\" matches include prefix \"%s\".", path, *prefix);
2389 return true;
2390 }
2391
2392 /* no matches, so we should include this path only if we
2393 * have no whitelist at all */
2394 if (strv_isempty(arg_include_prefixes))
2395 return true;
2396
2397 log_debug("Entry \"%s\" does not match any include prefix, skipping.", path);
2398 return false;
2399 }
2400
2401 static int specifier_expansion_from_arg(Item *i) {
2402 _cleanup_free_ char *unescaped = NULL, *resolved = NULL;
2403 char **xattr;
2404 int r;
2405
2406 assert(i);
2407
2408 if (i->argument == NULL)
2409 return 0;
2410
2411 switch (i->type) {
2412 case COPY_FILES:
2413 case CREATE_SYMLINK:
2414 case CREATE_FILE:
2415 case TRUNCATE_FILE:
2416 case WRITE_FILE:
2417 r = cunescape(i->argument, 0, &unescaped);
2418 if (r < 0)
2419 return log_error_errno(r, "Failed to unescape parameter to write: %s", i->argument);
2420
2421 r = specifier_printf(unescaped, specifier_table, NULL, &resolved);
2422 if (r < 0)
2423 return r;
2424
2425 free_and_replace(i->argument, resolved);
2426 break;
2427
2428 case SET_XATTR:
2429 case RECURSIVE_SET_XATTR:
2430 assert(i->xattrs);
2431
2432 STRV_FOREACH (xattr, i->xattrs) {
2433 r = specifier_printf(*xattr, specifier_table, NULL, &resolved);
2434 if (r < 0)
2435 return r;
2436
2437 free_and_replace(*xattr, resolved);
2438 }
2439 break;
2440
2441 default:
2442 break;
2443 }
2444 return 0;
2445 }
2446
2447 static int patch_var_run(const char *fname, unsigned line, char **path) {
2448 const char *k;
2449 char *n;
2450
2451 assert(path);
2452 assert(*path);
2453
2454 /* Optionally rewrites lines referencing /var/run/, to use /run/ instead. Why bother? tmpfiles merges lines in
2455 * some cases and detects conflicts in others. If files/directories are specified through two equivalent lines
2456 * this is problematic as neither case will be detected. Ideally we'd detect these cases by resolving symlinks
2457 * early, but that's precisely not what we can do here as this code very likely is running very early on, at a
2458 * time where the paths in question are not available yet, or even more importantly, our own tmpfiles rules
2459 * might create the paths that are intermediary to the listed paths. We can't really cover the generic case,
2460 * but the least we can do is cover the specific case of /var/run vs. /run, as /var/run is a legacy name for
2461 * /run only, and we explicitly document that and require that on systemd systems the former is a symlink to
2462 * the latter. Moreover files below this path are by far the primary usecase for tmpfiles.d/. */
2463
2464 k = path_startswith(*path, "/var/run/");
2465 if (isempty(k)) /* Don't complain about other paths than /var/run, and not about /var/run itself either. */
2466 return 0;
2467
2468 n = strjoin("/run/", k);
2469 if (!n)
2470 return log_oom();
2471
2472 /* Also log about this briefly. We do so at LOG_NOTICE level, as we fixed up the situation automatically, hence
2473 * there's no immediate need for action by the user. However, in the interest of making things less confusing
2474 * to the user, let's still inform the user that these snippets should really be updated. */
2475
2476 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);
2477
2478 free_and_replace(*path, n);
2479
2480 return 0;
2481 }
2482
2483 static int parse_line(const char *fname, unsigned line, const char *buffer, bool *invalid_config) {
2484
2485 _cleanup_free_ char *action = NULL, *mode = NULL, *user = NULL, *group = NULL, *age = NULL, *path = NULL;
2486 _cleanup_(item_free_contents) Item i = {};
2487 ItemArray *existing;
2488 OrderedHashmap *h;
2489 int r, pos;
2490 bool force = false, boot = false, allow_failure = false;
2491
2492 assert(fname);
2493 assert(line >= 1);
2494 assert(buffer);
2495
2496 r = extract_many_words(
2497 &buffer,
2498 NULL,
2499 EXTRACT_QUOTES,
2500 &action,
2501 &path,
2502 &mode,
2503 &user,
2504 &group,
2505 &age,
2506 NULL);
2507 if (r < 0) {
2508 if (IN_SET(r, -EINVAL, -EBADSLT))
2509 /* invalid quoting and such or an unknown specifier */
2510 *invalid_config = true;
2511 return log_error_errno(r, "[%s:%u] Failed to parse line: %m", fname, line);
2512 } else if (r < 2) {
2513 *invalid_config = true;
2514 log_error("[%s:%u] Syntax error.", fname, line);
2515 return -EIO;
2516 }
2517
2518 if (!empty_or_dash(buffer)) {
2519 i.argument = strdup(buffer);
2520 if (!i.argument)
2521 return log_oom();
2522 }
2523
2524 if (isempty(action)) {
2525 *invalid_config = true;
2526 log_error("[%s:%u] Command too short '%s'.", fname, line, action);
2527 return -EINVAL;
2528 }
2529
2530 for (pos = 1; action[pos]; pos++) {
2531 if (action[pos] == '!' && !boot)
2532 boot = true;
2533 else if (action[pos] == '+' && !force)
2534 force = true;
2535 else if (action[pos] == '-' && !allow_failure)
2536 allow_failure = true;
2537 else {
2538 *invalid_config = true;
2539 log_error("[%s:%u] Unknown modifiers in command '%s'",
2540 fname, line, action);
2541 return -EINVAL;
2542 }
2543 }
2544
2545 if (boot && !arg_boot) {
2546 log_debug("Ignoring entry %s \"%s\" because --boot is not specified.",
2547 action, path);
2548 return 0;
2549 }
2550
2551 i.type = action[0];
2552 i.force = force;
2553 i.allow_failure = allow_failure;
2554
2555 r = specifier_printf(path, specifier_table, NULL, &i.path);
2556 if (r == -ENXIO)
2557 return log_unresolvable_specifier(fname, line);
2558 if (r < 0) {
2559 if (IN_SET(r, -EINVAL, -EBADSLT))
2560 *invalid_config = true;
2561 return log_error_errno(r, "[%s:%u] Failed to replace specifiers: %s", fname, line, path);
2562 }
2563
2564 r = patch_var_run(fname, line, &i.path);
2565 if (r < 0)
2566 return r;
2567
2568 switch (i.type) {
2569
2570 case CREATE_DIRECTORY:
2571 case CREATE_SUBVOLUME:
2572 case CREATE_SUBVOLUME_INHERIT_QUOTA:
2573 case CREATE_SUBVOLUME_NEW_QUOTA:
2574 case EMPTY_DIRECTORY:
2575 case TRUNCATE_DIRECTORY:
2576 case CREATE_FIFO:
2577 case IGNORE_PATH:
2578 case IGNORE_DIRECTORY_PATH:
2579 case REMOVE_PATH:
2580 case RECURSIVE_REMOVE_PATH:
2581 case ADJUST_MODE:
2582 case RELABEL_PATH:
2583 case RECURSIVE_RELABEL_PATH:
2584 if (i.argument)
2585 log_warning("[%s:%u] %c lines don't take argument fields, ignoring.", fname, line, i.type);
2586
2587 break;
2588
2589 case CREATE_FILE:
2590 case TRUNCATE_FILE:
2591 break;
2592
2593 case CREATE_SYMLINK:
2594 if (!i.argument) {
2595 i.argument = strappend("/usr/share/factory/", i.path);
2596 if (!i.argument)
2597 return log_oom();
2598 }
2599 break;
2600
2601 case WRITE_FILE:
2602 if (!i.argument) {
2603 *invalid_config = true;
2604 log_error("[%s:%u] Write file requires argument.", fname, line);
2605 return -EBADMSG;
2606 }
2607 break;
2608
2609 case COPY_FILES:
2610 if (!i.argument) {
2611 i.argument = strappend("/usr/share/factory/", i.path);
2612 if (!i.argument)
2613 return log_oom();
2614 } else if (!path_is_absolute(i.argument)) {
2615 *invalid_config = true;
2616 log_error("[%s:%u] Source path is not absolute.", fname, line);
2617 return -EBADMSG;
2618 }
2619
2620 path_simplify(i.argument, false);
2621 break;
2622
2623 case CREATE_CHAR_DEVICE:
2624 case CREATE_BLOCK_DEVICE:
2625 if (!i.argument) {
2626 *invalid_config = true;
2627 log_error("[%s:%u] Device file requires argument.", fname, line);
2628 return -EBADMSG;
2629 }
2630
2631 r = parse_dev(i.argument, &i.major_minor);
2632 if (r < 0) {
2633 *invalid_config = true;
2634 log_error_errno(r, "[%s:%u] Can't parse device file major/minor '%s'.", fname, line, i.argument);
2635 return -EBADMSG;
2636 }
2637
2638 break;
2639
2640 case SET_XATTR:
2641 case RECURSIVE_SET_XATTR:
2642 if (!i.argument) {
2643 *invalid_config = true;
2644 log_error("[%s:%u] Set extended attribute requires argument.", fname, line);
2645 return -EBADMSG;
2646 }
2647 r = parse_xattrs_from_arg(&i);
2648 if (r < 0)
2649 return r;
2650 break;
2651
2652 case SET_ACL:
2653 case RECURSIVE_SET_ACL:
2654 if (!i.argument) {
2655 *invalid_config = true;
2656 log_error("[%s:%u] Set ACLs requires argument.", fname, line);
2657 return -EBADMSG;
2658 }
2659 r = parse_acls_from_arg(&i);
2660 if (r < 0)
2661 return r;
2662 break;
2663
2664 case SET_ATTRIBUTE:
2665 case RECURSIVE_SET_ATTRIBUTE:
2666 if (!i.argument) {
2667 *invalid_config = true;
2668 log_error("[%s:%u] Set file attribute requires argument.", fname, line);
2669 return -EBADMSG;
2670 }
2671 r = parse_attribute_from_arg(&i);
2672 if (IN_SET(r, -EINVAL, -EBADSLT))
2673 *invalid_config = true;
2674 if (r < 0)
2675 return r;
2676 break;
2677
2678 default:
2679 log_error("[%s:%u] Unknown command type '%c'.", fname, line, (char) i.type);
2680 *invalid_config = true;
2681 return -EBADMSG;
2682 }
2683
2684 if (!path_is_absolute(i.path)) {
2685 log_error("[%s:%u] Path '%s' not absolute.", fname, line, i.path);
2686 *invalid_config = true;
2687 return -EBADMSG;
2688 }
2689
2690 path_simplify(i.path, false);
2691
2692 if (!should_include_path(i.path))
2693 return 0;
2694
2695 r = specifier_expansion_from_arg(&i);
2696 if (r == -ENXIO)
2697 return log_unresolvable_specifier(fname, line);
2698 if (r < 0) {
2699 if (IN_SET(r, -EINVAL, -EBADSLT))
2700 *invalid_config = true;
2701 return log_error_errno(r, "[%s:%u] Failed to substitute specifiers in argument: %m",
2702 fname, line);
2703 }
2704
2705 if (arg_root) {
2706 char *p;
2707
2708 p = prefix_root(arg_root, i.path);
2709 if (!p)
2710 return log_oom();
2711
2712 free_and_replace(i.path, p);
2713 }
2714
2715 if (!empty_or_dash(user)) {
2716 const char *u = user;
2717
2718 r = get_user_creds(&u, &i.uid, NULL, NULL, NULL, USER_CREDS_ALLOW_MISSING);
2719 if (r < 0) {
2720 *invalid_config = true;
2721 return log_error_errno(r, "[%s:%u] Unknown user '%s'.", fname, line, user);
2722 }
2723
2724 i.uid_set = true;
2725 }
2726
2727 if (!empty_or_dash(group)) {
2728 const char *g = group;
2729
2730 r = get_group_creds(&g, &i.gid, USER_CREDS_ALLOW_MISSING);
2731 if (r < 0) {
2732 *invalid_config = true;
2733 log_error("[%s:%u] Unknown group '%s'.", fname, line, group);
2734 return r;
2735 }
2736
2737 i.gid_set = true;
2738 }
2739
2740 if (!empty_or_dash(mode)) {
2741 const char *mm = mode;
2742 unsigned m;
2743
2744 if (*mm == '~') {
2745 i.mask_perms = true;
2746 mm++;
2747 }
2748
2749 if (parse_mode(mm, &m) < 0) {
2750 *invalid_config = true;
2751 log_error("[%s:%u] Invalid mode '%s'.", fname, line, mode);
2752 return -EBADMSG;
2753 }
2754
2755 i.mode = m;
2756 i.mode_set = true;
2757 } else
2758 i.mode = IN_SET(i.type, CREATE_DIRECTORY, TRUNCATE_DIRECTORY, CREATE_SUBVOLUME, CREATE_SUBVOLUME_INHERIT_QUOTA, CREATE_SUBVOLUME_NEW_QUOTA) ? 0755 : 0644;
2759
2760 if (!empty_or_dash(age)) {
2761 const char *a = age;
2762
2763 if (*a == '~') {
2764 i.keep_first_level = true;
2765 a++;
2766 }
2767
2768 if (parse_sec(a, &i.age) < 0) {
2769 *invalid_config = true;
2770 log_error("[%s:%u] Invalid age '%s'.", fname, line, age);
2771 return -EBADMSG;
2772 }
2773
2774 i.age_set = true;
2775 }
2776
2777 h = needs_glob(i.type) ? globs : items;
2778
2779 existing = ordered_hashmap_get(h, i.path);
2780 if (existing) {
2781 size_t n;
2782
2783 for (n = 0; n < existing->n_items; n++) {
2784 if (!item_compatible(existing->items + n, &i)) {
2785 log_notice("[%s:%u] Duplicate line for path \"%s\", ignoring.",
2786 fname, line, i.path);
2787 return 0;
2788 }
2789 }
2790 } else {
2791 existing = new0(ItemArray, 1);
2792 if (!existing)
2793 return log_oom();
2794
2795 r = ordered_hashmap_put(h, i.path, existing);
2796 if (r < 0) {
2797 free(existing);
2798 return log_oom();
2799 }
2800 }
2801
2802 if (!GREEDY_REALLOC(existing->items, existing->allocated, existing->n_items + 1))
2803 return log_oom();
2804
2805 existing->items[existing->n_items++] = i;
2806 i = (struct Item) {};
2807
2808 /* Sort item array, to enforce stable ordering of application */
2809 typesafe_qsort(existing->items, existing->n_items, item_compare);
2810
2811 return 0;
2812 }
2813
2814 static int cat_config(char **config_dirs, char **args) {
2815 _cleanup_strv_free_ char **files = NULL;
2816 int r;
2817
2818 r = conf_files_list_with_replacement(arg_root, config_dirs, arg_replace, &files, NULL);
2819 if (r < 0)
2820 return r;
2821
2822 return cat_files(NULL, files, 0);
2823 }
2824
2825 static int help(void) {
2826 _cleanup_free_ char *link = NULL;
2827 int r;
2828
2829 r = terminal_urlify_man("systemd-tmpfiles", "8", &link);
2830 if (r < 0)
2831 return log_oom();
2832
2833 printf("%s [OPTIONS...] [CONFIGURATION FILE...]\n\n"
2834 "Creates, deletes and cleans up volatile and temporary files and directories.\n\n"
2835 " -h --help Show this help\n"
2836 " --user Execute user configuration\n"
2837 " --version Show package version\n"
2838 " --cat-config Show configuration files\n"
2839 " --create Create marked files/directories\n"
2840 " --clean Clean up marked directories\n"
2841 " --remove Remove marked files/directories\n"
2842 " --boot Execute actions only safe at boot\n"
2843 " --prefix=PATH Only apply rules with the specified prefix\n"
2844 " --exclude-prefix=PATH Ignore rules with the specified prefix\n"
2845 " --root=PATH Operate on an alternate filesystem root\n"
2846 " --replace=PATH Treat arguments as replacement for PATH\n"
2847 " --no-pager Do not pipe output into a pager\n"
2848 "\nSee the %s for details.\n"
2849 , program_invocation_short_name
2850 , link
2851 );
2852
2853 return 0;
2854 }
2855
2856 static int parse_argv(int argc, char *argv[]) {
2857
2858 enum {
2859 ARG_VERSION = 0x100,
2860 ARG_CAT_CONFIG,
2861 ARG_USER,
2862 ARG_CREATE,
2863 ARG_CLEAN,
2864 ARG_REMOVE,
2865 ARG_BOOT,
2866 ARG_PREFIX,
2867 ARG_EXCLUDE_PREFIX,
2868 ARG_ROOT,
2869 ARG_REPLACE,
2870 ARG_NO_PAGER,
2871 };
2872
2873 static const struct option options[] = {
2874 { "help", no_argument, NULL, 'h' },
2875 { "user", no_argument, NULL, ARG_USER },
2876 { "version", no_argument, NULL, ARG_VERSION },
2877 { "cat-config", no_argument, NULL, ARG_CAT_CONFIG },
2878 { "create", no_argument, NULL, ARG_CREATE },
2879 { "clean", no_argument, NULL, ARG_CLEAN },
2880 { "remove", no_argument, NULL, ARG_REMOVE },
2881 { "boot", no_argument, NULL, ARG_BOOT },
2882 { "prefix", required_argument, NULL, ARG_PREFIX },
2883 { "exclude-prefix", required_argument, NULL, ARG_EXCLUDE_PREFIX },
2884 { "root", required_argument, NULL, ARG_ROOT },
2885 { "replace", required_argument, NULL, ARG_REPLACE },
2886 { "no-pager", no_argument, NULL, ARG_NO_PAGER },
2887 {}
2888 };
2889
2890 int c, r;
2891
2892 assert(argc >= 0);
2893 assert(argv);
2894
2895 while ((c = getopt_long(argc, argv, "h", options, NULL)) >= 0)
2896
2897 switch (c) {
2898
2899 case 'h':
2900 return help();
2901
2902 case ARG_VERSION:
2903 return version();
2904
2905 case ARG_CAT_CONFIG:
2906 arg_cat_config = true;
2907 break;
2908
2909 case ARG_USER:
2910 arg_user = true;
2911 break;
2912
2913 case ARG_CREATE:
2914 arg_operation |= OPERATION_CREATE;
2915 break;
2916
2917 case ARG_CLEAN:
2918 arg_operation |= OPERATION_CLEAN;
2919 break;
2920
2921 case ARG_REMOVE:
2922 arg_operation |= OPERATION_REMOVE;
2923 break;
2924
2925 case ARG_BOOT:
2926 arg_boot = true;
2927 break;
2928
2929 case ARG_PREFIX:
2930 if (strv_push(&arg_include_prefixes, optarg) < 0)
2931 return log_oom();
2932 break;
2933
2934 case ARG_EXCLUDE_PREFIX:
2935 if (strv_push(&arg_exclude_prefixes, optarg) < 0)
2936 return log_oom();
2937 break;
2938
2939 case ARG_ROOT:
2940 r = parse_path_argument_and_warn(optarg, true, &arg_root);
2941 if (r < 0)
2942 return r;
2943 break;
2944
2945 case ARG_REPLACE:
2946 if (!path_is_absolute(optarg) ||
2947 !endswith(optarg, ".conf"))
2948 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
2949 "The argument to --replace= must an absolute path to a config file");
2950
2951 arg_replace = optarg;
2952 break;
2953
2954 case ARG_NO_PAGER:
2955 arg_pager_flags |= PAGER_DISABLE;
2956 break;
2957
2958 case '?':
2959 return -EINVAL;
2960
2961 default:
2962 assert_not_reached("Unhandled option");
2963 }
2964
2965 if (arg_operation == 0 && !arg_cat_config)
2966 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
2967 "You need to specify at least one of --clean, --create or --remove.");
2968
2969 if (arg_replace && arg_cat_config)
2970 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
2971 "Option --replace= is not supported with --cat-config");
2972
2973 if (arg_replace && optind >= argc)
2974 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
2975 "When --replace= is given, some configuration items must be specified");
2976
2977 return 1;
2978 }
2979
2980 static int read_config_file(char **config_dirs, const char *fn, bool ignore_enoent, bool *invalid_config) {
2981 _cleanup_fclose_ FILE *_f = NULL;
2982 Iterator iterator;
2983 unsigned v = 0;
2984 FILE *f;
2985 Item *i;
2986 int r = 0;
2987
2988 assert(fn);
2989
2990 if (streq(fn, "-")) {
2991 log_debug("Reading config from stdin…");
2992 fn = "<stdin>";
2993 f = stdin;
2994 } else {
2995 r = search_and_fopen(fn, "re", arg_root, (const char**) config_dirs, &_f);
2996 if (r < 0) {
2997 if (ignore_enoent && r == -ENOENT) {
2998 log_debug_errno(r, "Failed to open \"%s\", ignoring: %m", fn);
2999 return 0;
3000 }
3001
3002 return log_error_errno(r, "Failed to open '%s': %m", fn);
3003 }
3004 log_debug("Reading config file \"%s\"…", fn);
3005 f = _f;
3006 }
3007
3008 for (;;) {
3009 _cleanup_free_ char *line = NULL;
3010 bool invalid_line = false;
3011 char *l;
3012 int k;
3013
3014 k = read_line(f, LONG_LINE_MAX, &line);
3015 if (k < 0)
3016 return log_error_errno(k, "Failed to read '%s': %m", fn);
3017 if (k == 0)
3018 break;
3019
3020 v++;
3021
3022 l = strstrip(line);
3023 if (IN_SET(*l, 0, '#'))
3024 continue;
3025
3026 k = parse_line(fn, v, l, &invalid_line);
3027 if (k < 0) {
3028 if (invalid_line)
3029 /* Allow reporting with a special code if the caller requested this */
3030 *invalid_config = true;
3031 else if (r == 0)
3032 /* The first error becomes our return value */
3033 r = k;
3034 }
3035 }
3036
3037 /* we have to determine age parameter for each entry of type X */
3038 ORDERED_HASHMAP_FOREACH(i, globs, iterator) {
3039 Iterator iter;
3040 Item *j, *candidate_item = NULL;
3041
3042 if (i->type != IGNORE_DIRECTORY_PATH)
3043 continue;
3044
3045 ORDERED_HASHMAP_FOREACH(j, items, iter) {
3046 if (!IN_SET(j->type, CREATE_DIRECTORY, TRUNCATE_DIRECTORY, CREATE_SUBVOLUME, CREATE_SUBVOLUME_INHERIT_QUOTA, CREATE_SUBVOLUME_NEW_QUOTA))
3047 continue;
3048
3049 if (path_equal(j->path, i->path)) {
3050 candidate_item = j;
3051 break;
3052 }
3053
3054 if ((!candidate_item && path_startswith(i->path, j->path)) ||
3055 (candidate_item && path_startswith(j->path, candidate_item->path) && (fnmatch(i->path, j->path, FNM_PATHNAME | FNM_PERIOD) == 0)))
3056 candidate_item = j;
3057 }
3058
3059 if (candidate_item && candidate_item->age_set) {
3060 i->age = candidate_item->age;
3061 i->age_set = true;
3062 }
3063 }
3064
3065 if (ferror(f)) {
3066 log_error_errno(errno, "Failed to read from file %s: %m", fn);
3067 if (r == 0)
3068 r = -EIO;
3069 }
3070
3071 return r;
3072 }
3073
3074 static int parse_arguments(char **config_dirs, char **args, bool *invalid_config) {
3075 char **arg;
3076 int r;
3077
3078 STRV_FOREACH(arg, args) {
3079 r = read_config_file(config_dirs, *arg, false, invalid_config);
3080 if (r < 0)
3081 return r;
3082 }
3083
3084 return 0;
3085 }
3086
3087 static int read_config_files(char **config_dirs, char **args, bool *invalid_config) {
3088 _cleanup_strv_free_ char **files = NULL;
3089 _cleanup_free_ char *p = NULL;
3090 char **f;
3091 int r;
3092
3093 r = conf_files_list_with_replacement(arg_root, config_dirs, arg_replace, &files, &p);
3094 if (r < 0)
3095 return r;
3096
3097 STRV_FOREACH(f, files)
3098 if (p && path_equal(*f, p)) {
3099 log_debug("Parsing arguments at position \"%s\"…", *f);
3100
3101 r = parse_arguments(config_dirs, args, invalid_config);
3102 if (r < 0)
3103 return r;
3104 } else
3105 /* Just warn, ignore result otherwise.
3106 * read_config_file() has some debug output, so no need to print anything. */
3107 (void) read_config_file(config_dirs, *f, true, invalid_config);
3108
3109 return 0;
3110 }
3111
3112 static int link_parent(ItemArray *a) {
3113 const char *path;
3114 char *prefix;
3115 int r;
3116
3117 assert(a);
3118
3119 /* Finds the closest "parent" item array for the specified item array. Then registers the specified item array
3120 * as child of it, and fills the parent in, linking them both ways. This allows us to later create parents
3121 * before their children, and clean up/remove children before their parents. */
3122
3123 if (a->n_items <= 0)
3124 return 0;
3125
3126 path = a->items[0].path;
3127 prefix = newa(char, strlen(path) + 1);
3128 PATH_FOREACH_PREFIX(prefix, path) {
3129 ItemArray *j;
3130
3131 j = ordered_hashmap_get(items, prefix);
3132 if (!j)
3133 j = ordered_hashmap_get(globs, prefix);
3134 if (j) {
3135 r = set_ensure_allocated(&j->children, NULL);
3136 if (r < 0)
3137 return log_oom();
3138
3139 r = set_put(j->children, a);
3140 if (r < 0)
3141 return log_oom();
3142
3143 a->parent = j;
3144 return 1;
3145 }
3146 }
3147
3148 return 0;
3149 }
3150
3151 DEFINE_PRIVATE_HASH_OPS_WITH_VALUE_DESTRUCTOR(item_array_hash_ops, char, string_hash_func, string_compare_func,
3152 ItemArray, item_array_free);
3153
3154 static int run(int argc, char *argv[]) {
3155 _cleanup_strv_free_ char **config_dirs = NULL;
3156 bool invalid_config = false;
3157 Iterator iterator;
3158 ItemArray *a;
3159 enum {
3160 PHASE_REMOVE_AND_CLEAN,
3161 PHASE_CREATE,
3162 _PHASE_MAX
3163 } phase;
3164 int r, k;
3165
3166 r = parse_argv(argc, argv);
3167 if (r <= 0)
3168 return r;
3169
3170 log_setup_service();
3171
3172 /* Descending down file system trees might take a lot of fds */
3173 (void) rlimit_nofile_bump(HIGH_RLIMIT_NOFILE);
3174
3175 if (arg_user) {
3176 r = user_config_paths(&config_dirs);
3177 if (r < 0)
3178 return log_error_errno(r, "Failed to initialize configuration directory list: %m");
3179 } else {
3180 config_dirs = strv_split_nulstr(CONF_PATHS_NULSTR("tmpfiles.d"));
3181 if (!config_dirs)
3182 return log_oom();
3183 }
3184
3185 if (DEBUG_LOGGING) {
3186 _cleanup_free_ char *t = NULL;
3187
3188 t = strv_join(config_dirs, "\n\t");
3189 if (t)
3190 log_debug("Looking for configuration files in (higher priority first):\n\t%s", t);
3191 }
3192
3193 if (arg_cat_config) {
3194 (void) pager_open(arg_pager_flags);
3195
3196 return cat_config(config_dirs, argv + optind);
3197 }
3198
3199 umask(0022);
3200
3201 mac_selinux_init();
3202
3203 items = ordered_hashmap_new(&item_array_hash_ops);
3204 globs = ordered_hashmap_new(&item_array_hash_ops);
3205 if (!items || !globs)
3206 return log_oom();
3207
3208 /* If command line arguments are specified along with --replace, read all
3209 * configuration files and insert the positional arguments at the specified
3210 * place. Otherwise, if command line arguments are specified, execute just
3211 * them, and finally, without --replace= or any positional arguments, just
3212 * read configuration and execute it.
3213 */
3214 if (arg_replace || optind >= argc)
3215 r = read_config_files(config_dirs, argv + optind, &invalid_config);
3216 else
3217 r = parse_arguments(config_dirs, argv + optind, &invalid_config);
3218 if (r < 0)
3219 return r;
3220
3221 /* Let's now link up all child/parent relationships */
3222 ORDERED_HASHMAP_FOREACH(a, items, iterator) {
3223 r = link_parent(a);
3224 if (r < 0)
3225 return r;
3226 }
3227 ORDERED_HASHMAP_FOREACH(a, globs, iterator) {
3228 r = link_parent(a);
3229 if (r < 0)
3230 return r;
3231 }
3232
3233 /* If multiple operations are requested, let's first run the remove/clean operations, and only then the create
3234 * operations. i.e. that we first clean out the platform we then build on. */
3235 for (phase = 0; phase < _PHASE_MAX; phase++) {
3236 OperationMask op;
3237
3238 if (phase == PHASE_REMOVE_AND_CLEAN)
3239 op = arg_operation & (OPERATION_REMOVE|OPERATION_CLEAN);
3240 else if (phase == PHASE_CREATE)
3241 op = arg_operation & OPERATION_CREATE;
3242 else
3243 assert_not_reached("unexpected phase");
3244
3245 if (op == 0) /* Nothing requested in this phase */
3246 continue;
3247
3248 /* The non-globbing ones usually create things, hence we apply them first */
3249 ORDERED_HASHMAP_FOREACH(a, items, iterator) {
3250 k = process_item_array(a, op);
3251 if (k < 0 && r >= 0)
3252 r = k;
3253 }
3254
3255 /* The globbing ones usually alter things, hence we apply them second. */
3256 ORDERED_HASHMAP_FOREACH(a, globs, iterator) {
3257 k = process_item_array(a, op);
3258 if (k < 0 && r >= 0)
3259 r = k;
3260 }
3261 }
3262
3263 if (ERRNO_IS_RESOURCE(-r))
3264 return r;
3265 if (invalid_config)
3266 return EX_DATAERR;
3267 if (r < 0)
3268 return EX_CANTCREAT;
3269 return 0;
3270 }
3271
3272 DEFINE_MAIN_FUNCTION_WITH_POSITIVE_FAILURE(run);
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