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Merge pull request #11827 from keszybz/pkgconfig-variables
[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 "specifier.h"
57 #include "stat-util.h"
58 #include "stdio-util.h"
59 #include "string-table.h"
60 #include "string-util.h"
61 #include "strv.h"
62 #include "umask-util.h"
63 #include "user-util.h"
64 #include "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 int fd_set_perms(Item *i, int fd, const char *path, const struct stat *st) {
780 struct stat stbuf;
781
782 assert(i);
783 assert(fd);
784 assert(path);
785
786 if (!i->mode_set && !i->uid_set && !i->gid_set)
787 goto shortcut;
788
789 if (!st) {
790 if (fstat(fd, &stbuf) < 0)
791 return log_error_errno(errno, "fstat(%s) failed: %m", path);
792 st = &stbuf;
793 }
794
795 if (hardlink_vulnerable(st))
796 return log_error_errno(SYNTHETIC_ERRNO(EPERM),
797 "Refusing to set permissions on hardlinked file %s while the fs.protected_hardlinks sysctl is turned off.",
798 path);
799
800 if (i->mode_set) {
801 if (S_ISLNK(st->st_mode))
802 log_debug("Skipping mode fix for symlink %s.", path);
803 else {
804 mode_t m = i->mode;
805
806 if (i->mask_perms) {
807 if (!(st->st_mode & 0111))
808 m &= ~0111;
809 if (!(st->st_mode & 0222))
810 m &= ~0222;
811 if (!(st->st_mode & 0444))
812 m &= ~0444;
813 if (!S_ISDIR(st->st_mode))
814 m &= ~07000; /* remove sticky/sgid/suid bit, unless directory */
815 }
816
817 if (m == (st->st_mode & 07777))
818 log_debug("\"%s\" has correct mode %o already.", path, st->st_mode);
819 else {
820 log_debug("Changing \"%s\" to mode %o.", path, m);
821 if (fchmod_opath(fd, m) < 0)
822 return log_error_errno(errno, "fchmod() of %s failed: %m", path);
823 }
824 }
825 }
826
827 if ((i->uid_set && i->uid != st->st_uid) ||
828 (i->gid_set && i->gid != st->st_gid)) {
829 log_debug("Changing \"%s\" to owner "UID_FMT":"GID_FMT,
830 path,
831 i->uid_set ? i->uid : UID_INVALID,
832 i->gid_set ? i->gid : GID_INVALID);
833
834 if (fchownat(fd,
835 "",
836 i->uid_set ? i->uid : UID_INVALID,
837 i->gid_set ? i->gid : GID_INVALID,
838 AT_EMPTY_PATH) < 0)
839 return log_error_errno(errno, "fchownat() of %s failed: %m", path);
840 }
841
842 shortcut:
843 return label_fix(path, 0);
844 }
845
846 static int path_open_parent_safe(const char *path) {
847 _cleanup_free_ char *dn = NULL;
848 int fd;
849
850 if (path_equal(path, "/") || !path_is_normalized(path))
851 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
852 "Failed to open parent of '%s': invalid path.",
853 path);
854
855 dn = dirname_malloc(path);
856 if (!dn)
857 return log_oom();
858
859 fd = chase_symlinks(dn, NULL, CHASE_OPEN|CHASE_SAFE|CHASE_WARN, NULL);
860 if (fd < 0 && fd != -ENOLINK)
861 return log_error_errno(fd, "Failed to validate path %s: %m", path);
862
863 return fd;
864 }
865
866 static int path_open_safe(const char *path) {
867 int fd;
868
869 /* path_open_safe() returns a file descriptor opened with O_PATH after
870 * verifying that the path doesn't contain unsafe transitions, except
871 * for its final component as the function does not follow symlink. */
872
873 assert(path);
874
875 if (!path_is_normalized(path))
876 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
877 "Failed to open invalid path '%s'.",
878 path);
879
880 fd = chase_symlinks(path, NULL, CHASE_OPEN|CHASE_SAFE|CHASE_WARN|CHASE_NOFOLLOW, NULL);
881 if (fd < 0 && fd != -ENOLINK)
882 return log_error_errno(fd, "Failed to validate path %s: %m", path);
883
884 return fd;
885 }
886
887 static int path_set_perms(Item *i, const char *path) {
888 _cleanup_close_ int fd = -1;
889
890 assert(i);
891 assert(path);
892
893 fd = path_open_safe(path);
894 if (fd < 0)
895 return fd;
896
897 return fd_set_perms(i, fd, path, NULL);
898 }
899
900 static int parse_xattrs_from_arg(Item *i) {
901 const char *p;
902 int r;
903
904 assert(i);
905 assert(i->argument);
906
907 p = i->argument;
908
909 for (;;) {
910 _cleanup_free_ char *name = NULL, *value = NULL, *xattr = NULL;
911
912 r = extract_first_word(&p, &xattr, NULL, EXTRACT_QUOTES|EXTRACT_CUNESCAPE);
913 if (r < 0)
914 log_warning_errno(r, "Failed to parse extended attribute '%s', ignoring: %m", p);
915 if (r <= 0)
916 break;
917
918 r = split_pair(xattr, "=", &name, &value);
919 if (r < 0) {
920 log_warning_errno(r, "Failed to parse extended attribute, ignoring: %s", xattr);
921 continue;
922 }
923
924 if (isempty(name) || isempty(value)) {
925 log_warning("Malformed extended attribute found, ignoring: %s", xattr);
926 continue;
927 }
928
929 if (strv_push_pair(&i->xattrs, name, value) < 0)
930 return log_oom();
931
932 name = value = NULL;
933 }
934
935 return 0;
936 }
937
938 static int fd_set_xattrs(Item *i, int fd, const char *path, const struct stat *st) {
939 char procfs_path[STRLEN("/proc/self/fd/") + DECIMAL_STR_MAX(int)];
940 char **name, **value;
941
942 assert(i);
943 assert(fd);
944 assert(path);
945
946 xsprintf(procfs_path, "/proc/self/fd/%i", fd);
947
948 STRV_FOREACH_PAIR(name, value, i->xattrs) {
949 log_debug("Setting extended attribute '%s=%s' on %s.", *name, *value, path);
950 if (setxattr(procfs_path, *name, *value, strlen(*value), 0) < 0)
951 return log_error_errno(errno, "Setting extended attribute %s=%s on %s failed: %m",
952 *name, *value, path);
953 }
954 return 0;
955 }
956
957 static int path_set_xattrs(Item *i, const char *path) {
958 _cleanup_close_ int fd = -1;
959
960 assert(i);
961 assert(path);
962
963 fd = path_open_safe(path);
964 if (fd < 0)
965 return fd;
966
967 return fd_set_xattrs(i, fd, path, NULL);
968 }
969
970 static int parse_acls_from_arg(Item *item) {
971 #if HAVE_ACL
972 int r;
973
974 assert(item);
975
976 /* If force (= modify) is set, we will not modify the acl
977 * afterwards, so the mask can be added now if necessary. */
978
979 r = parse_acl(item->argument, &item->acl_access, &item->acl_default, !item->force);
980 if (r < 0)
981 log_warning_errno(r, "Failed to parse ACL \"%s\": %m. Ignoring", item->argument);
982 #else
983 log_warning_errno(SYNTHETIC_ERRNO(ENOSYS), "ACLs are not supported. Ignoring");
984 #endif
985
986 return 0;
987 }
988
989 #if HAVE_ACL
990 static int path_set_acl(const char *path, const char *pretty, acl_type_t type, acl_t acl, bool modify) {
991 _cleanup_(acl_free_charpp) char *t = NULL;
992 _cleanup_(acl_freep) acl_t dup = NULL;
993 int r;
994
995 /* Returns 0 for success, positive error if already warned,
996 * negative error otherwise. */
997
998 if (modify) {
999 r = acls_for_file(path, type, acl, &dup);
1000 if (r < 0)
1001 return r;
1002
1003 r = calc_acl_mask_if_needed(&dup);
1004 if (r < 0)
1005 return r;
1006 } else {
1007 dup = acl_dup(acl);
1008 if (!dup)
1009 return -errno;
1010
1011 /* the mask was already added earlier if needed */
1012 }
1013
1014 r = add_base_acls_if_needed(&dup, path);
1015 if (r < 0)
1016 return r;
1017
1018 t = acl_to_any_text(dup, NULL, ',', TEXT_ABBREVIATE);
1019 log_debug("Setting %s ACL %s on %s.",
1020 type == ACL_TYPE_ACCESS ? "access" : "default",
1021 strna(t), pretty);
1022
1023 r = acl_set_file(path, type, dup);
1024 if (r < 0)
1025 /* Return positive to indicate we already warned */
1026 return -log_error_errno(errno,
1027 "Setting %s ACL \"%s\" on %s failed: %m",
1028 type == ACL_TYPE_ACCESS ? "access" : "default",
1029 strna(t), pretty);
1030
1031 return 0;
1032 }
1033 #endif
1034
1035 static int fd_set_acls(Item *item, int fd, const char *path, const struct stat *st) {
1036 int r = 0;
1037 #if HAVE_ACL
1038 char procfs_path[STRLEN("/proc/self/fd/") + DECIMAL_STR_MAX(int)];
1039 struct stat stbuf;
1040
1041 assert(item);
1042 assert(fd);
1043 assert(path);
1044
1045 if (!st) {
1046 if (fstat(fd, &stbuf) < 0)
1047 return log_error_errno(errno, "fstat(%s) failed: %m", path);
1048 st = &stbuf;
1049 }
1050
1051 if (hardlink_vulnerable(st))
1052 return log_error_errno(SYNTHETIC_ERRNO(EPERM),
1053 "Refusing to set ACLs on hardlinked file %s while the fs.protected_hardlinks sysctl is turned off.",
1054 path);
1055
1056 if (S_ISLNK(st->st_mode)) {
1057 log_debug("Skipping ACL fix for symlink %s.", path);
1058 return 0;
1059 }
1060
1061 xsprintf(procfs_path, "/proc/self/fd/%i", fd);
1062
1063 if (item->acl_access)
1064 r = path_set_acl(procfs_path, path, ACL_TYPE_ACCESS, item->acl_access, item->force);
1065
1066 /* set only default acls to folders */
1067 if (r == 0 && item->acl_default && S_ISDIR(st->st_mode))
1068 r = path_set_acl(procfs_path, path, ACL_TYPE_DEFAULT, item->acl_default, item->force);
1069
1070 if (r > 0)
1071 return -r; /* already warned */
1072 if (r == -EOPNOTSUPP) {
1073 log_debug_errno(r, "ACLs not supported by file system at %s", path);
1074 return 0;
1075 }
1076 if (r < 0)
1077 return log_error_errno(r, "ACL operation on \"%s\" failed: %m", path);
1078 #endif
1079 return r;
1080 }
1081
1082 static int path_set_acls(Item *item, const char *path) {
1083 int r = 0;
1084 #if HAVE_ACL
1085 _cleanup_close_ int fd = -1;
1086
1087 assert(item);
1088 assert(path);
1089
1090 fd = path_open_safe(path);
1091 if (fd < 0)
1092 return fd;
1093
1094 r = fd_set_acls(item, fd, path, NULL);
1095 #endif
1096 return r;
1097 }
1098
1099 #define ATTRIBUTES_ALL \
1100 (FS_NOATIME_FL | \
1101 FS_SYNC_FL | \
1102 FS_DIRSYNC_FL | \
1103 FS_APPEND_FL | \
1104 FS_COMPR_FL | \
1105 FS_NODUMP_FL | \
1106 FS_EXTENT_FL | \
1107 FS_IMMUTABLE_FL | \
1108 FS_JOURNAL_DATA_FL | \
1109 FS_SECRM_FL | \
1110 FS_UNRM_FL | \
1111 FS_NOTAIL_FL | \
1112 FS_TOPDIR_FL | \
1113 FS_NOCOW_FL)
1114
1115 static int parse_attribute_from_arg(Item *item) {
1116
1117 static const struct {
1118 char character;
1119 unsigned value;
1120 } attributes[] = {
1121 { 'A', FS_NOATIME_FL }, /* do not update atime */
1122 { 'S', FS_SYNC_FL }, /* Synchronous updates */
1123 { 'D', FS_DIRSYNC_FL }, /* dirsync behaviour (directories only) */
1124 { 'a', FS_APPEND_FL }, /* writes to file may only append */
1125 { 'c', FS_COMPR_FL }, /* Compress file */
1126 { 'd', FS_NODUMP_FL }, /* do not dump file */
1127 { 'e', FS_EXTENT_FL }, /* Extents */
1128 { 'i', FS_IMMUTABLE_FL }, /* Immutable file */
1129 { 'j', FS_JOURNAL_DATA_FL }, /* Reserved for ext3 */
1130 { 's', FS_SECRM_FL }, /* Secure deletion */
1131 { 'u', FS_UNRM_FL }, /* Undelete */
1132 { 't', FS_NOTAIL_FL }, /* file tail should not be merged */
1133 { 'T', FS_TOPDIR_FL }, /* Top of directory hierarchies */
1134 { 'C', FS_NOCOW_FL }, /* Do not cow file */
1135 };
1136
1137 enum {
1138 MODE_ADD,
1139 MODE_DEL,
1140 MODE_SET
1141 } mode = MODE_ADD;
1142
1143 unsigned value = 0, mask = 0;
1144 const char *p;
1145
1146 assert(item);
1147
1148 p = item->argument;
1149 if (p) {
1150 if (*p == '+') {
1151 mode = MODE_ADD;
1152 p++;
1153 } else if (*p == '-') {
1154 mode = MODE_DEL;
1155 p++;
1156 } else if (*p == '=') {
1157 mode = MODE_SET;
1158 p++;
1159 }
1160 }
1161
1162 if (isempty(p) && mode != MODE_SET)
1163 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
1164 "Setting file attribute on '%s' needs an attribute specification.",
1165 item->path);
1166
1167 for (; p && *p ; p++) {
1168 unsigned i, v;
1169
1170 for (i = 0; i < ELEMENTSOF(attributes); i++)
1171 if (*p == attributes[i].character)
1172 break;
1173
1174 if (i >= ELEMENTSOF(attributes))
1175 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
1176 "Unknown file attribute '%c' on '%s'.",
1177 *p, item->path);
1178
1179 v = attributes[i].value;
1180
1181 SET_FLAG(value, v, IN_SET(mode, MODE_ADD, MODE_SET));
1182
1183 mask |= v;
1184 }
1185
1186 if (mode == MODE_SET)
1187 mask |= ATTRIBUTES_ALL;
1188
1189 assert(mask != 0);
1190
1191 item->attribute_mask = mask;
1192 item->attribute_value = value;
1193 item->attribute_set = true;
1194
1195 return 0;
1196 }
1197
1198 static int fd_set_attribute(Item *item, int fd, const char *path, const struct stat *st) {
1199 _cleanup_close_ int procfs_fd = -1;
1200 struct stat stbuf;
1201 unsigned f;
1202 int r;
1203
1204 assert(item);
1205 assert(fd);
1206 assert(path);
1207
1208 if (!item->attribute_set || item->attribute_mask == 0)
1209 return 0;
1210
1211 if (!st) {
1212 if (fstat(fd, &stbuf) < 0)
1213 return log_error_errno(errno, "fstat(%s) failed: %m", path);
1214 st = &stbuf;
1215 }
1216
1217 /* Issuing the file attribute ioctls on device nodes is not
1218 * safe, as that will be delivered to the drivers, not the
1219 * file system containing the device node. */
1220 if (!S_ISREG(st->st_mode) && !S_ISDIR(st->st_mode))
1221 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
1222 "Setting file flags is only supported on regular files and directories, cannot set on '%s'.",
1223 path);
1224
1225 f = item->attribute_value & item->attribute_mask;
1226
1227 /* Mask away directory-specific flags */
1228 if (!S_ISDIR(st->st_mode))
1229 f &= ~FS_DIRSYNC_FL;
1230
1231 procfs_fd = fd_reopen(fd, O_RDONLY|O_CLOEXEC|O_NOATIME);
1232 if (procfs_fd < 0)
1233 return log_error_errno(procfs_fd, "Failed to re-open '%s': %m", path);
1234
1235 r = chattr_fd(procfs_fd, f, item->attribute_mask, NULL);
1236 if (r < 0)
1237 log_full_errno(IN_SET(r, -ENOTTY, -EOPNOTSUPP) ? LOG_DEBUG : LOG_WARNING,
1238 r,
1239 "Cannot set file attribute for '%s', value=0x%08x, mask=0x%08x, ignoring: %m",
1240 path, item->attribute_value, item->attribute_mask);
1241
1242 return 0;
1243 }
1244
1245 static int path_set_attribute(Item *item, const char *path) {
1246 _cleanup_close_ int fd = -1;
1247
1248 if (!item->attribute_set || item->attribute_mask == 0)
1249 return 0;
1250
1251 fd = path_open_safe(path);
1252 if (fd < 0)
1253 return fd;
1254
1255 return fd_set_attribute(item, fd, path, NULL);
1256 }
1257
1258 static int write_one_file(Item *i, const char *path) {
1259 _cleanup_close_ int fd = -1, dir_fd = -1;
1260 char *bn;
1261 int r;
1262
1263 assert(i);
1264 assert(path);
1265 assert(i->argument);
1266 assert(i->type == WRITE_FILE);
1267
1268 /* Validate the path and keep the fd on the directory for opening the
1269 * file so we're sure that it can't be changed behind our back. */
1270 dir_fd = path_open_parent_safe(path);
1271 if (dir_fd < 0)
1272 return dir_fd;
1273
1274 bn = basename(path);
1275
1276 /* Follows symlinks */
1277 fd = openat(dir_fd, bn, O_NONBLOCK|O_CLOEXEC|O_WRONLY|O_NOCTTY, i->mode);
1278 if (fd < 0) {
1279 if (errno == ENOENT) {
1280 log_debug_errno(errno, "Not writing missing file \"%s\": %m", path);
1281 return 0;
1282 }
1283 return log_error_errno(errno, "Failed to open file \"%s\": %m", path);
1284 }
1285
1286 /* 'w' is allowed to write into any kind of files. */
1287 log_debug("Writing to \"%s\".", path);
1288
1289 r = loop_write(fd, i->argument, strlen(i->argument), false);
1290 if (r < 0)
1291 return log_error_errno(r, "Failed to write file \"%s\": %m", path);
1292
1293 return fd_set_perms(i, fd, path, NULL);
1294 }
1295
1296 static int create_file(Item *i, const char *path) {
1297 _cleanup_close_ int fd = -1, dir_fd = -1;
1298 struct stat stbuf, *st = NULL;
1299 int r = 0;
1300 char *bn;
1301
1302 assert(i);
1303 assert(path);
1304 assert(i->type == CREATE_FILE);
1305
1306 /* 'f' operates on regular files exclusively. */
1307
1308 /* Validate the path and keep the fd on the directory for opening the
1309 * file so we're sure that it can't be changed behind our back. */
1310 dir_fd = path_open_parent_safe(path);
1311 if (dir_fd < 0)
1312 return dir_fd;
1313
1314 bn = basename(path);
1315
1316 RUN_WITH_UMASK(0000) {
1317 mac_selinux_create_file_prepare(path, S_IFREG);
1318 fd = openat(dir_fd, bn, O_CREAT|O_EXCL|O_NOFOLLOW|O_NONBLOCK|O_CLOEXEC|O_WRONLY|O_NOCTTY, i->mode);
1319 mac_selinux_create_file_clear();
1320 }
1321
1322 if (fd < 0) {
1323 /* Even on a read-only filesystem, open(2) returns EEXIST if the
1324 * file already exists. It returns EROFS only if it needs to
1325 * create the file. */
1326 if (errno != EEXIST)
1327 return log_error_errno(errno, "Failed to create file %s: %m", path);
1328
1329 /* Re-open the file. At that point it must exist since open(2)
1330 * failed with EEXIST. We still need to check if the perms/mode
1331 * need to be changed. For read-only filesystems, we let
1332 * fd_set_perms() report the error if the perms need to be
1333 * modified. */
1334 fd = openat(dir_fd, bn, O_NOFOLLOW|O_CLOEXEC|O_PATH, i->mode);
1335 if (fd < 0)
1336 return log_error_errno(errno, "Failed to re-open file %s: %m", path);
1337
1338 if (fstat(fd, &stbuf) < 0)
1339 return log_error_errno(errno, "stat(%s) failed: %m", path);
1340
1341 if (!S_ISREG(stbuf.st_mode)) {
1342 log_error("%s exists and is not a regular file.", path);
1343 return -EEXIST;
1344 }
1345
1346 st = &stbuf;
1347 } else {
1348
1349 log_debug("\"%s\" has been created.", path);
1350
1351 if (i->argument) {
1352 log_debug("Writing to \"%s\".", path);
1353
1354 r = loop_write(fd, i->argument, strlen(i->argument), false);
1355 if (r < 0)
1356 return log_error_errno(r, "Failed to write file \"%s\": %m", path);
1357 }
1358 }
1359
1360 return fd_set_perms(i, fd, path, st);
1361 }
1362
1363 static int truncate_file(Item *i, const char *path) {
1364 _cleanup_close_ int fd = -1, dir_fd = -1;
1365 struct stat stbuf, *st = NULL;
1366 bool erofs = false;
1367 int r = 0;
1368 char *bn;
1369
1370 assert(i);
1371 assert(path);
1372 assert(i->type == TRUNCATE_FILE);
1373
1374 /* We want to operate on regular file exclusively especially since
1375 * O_TRUNC is unspecified if the file is neither a regular file nor a
1376 * fifo nor a terminal device. Therefore we first open the file and make
1377 * sure it's a regular one before truncating it. */
1378
1379 /* Validate the path and keep the fd on the directory for opening the
1380 * file so we're sure that it can't be changed behind our back. */
1381 dir_fd = path_open_parent_safe(path);
1382 if (dir_fd < 0)
1383 return dir_fd;
1384
1385 bn = basename(path);
1386
1387 RUN_WITH_UMASK(0000) {
1388 mac_selinux_create_file_prepare(path, S_IFREG);
1389 fd = openat(dir_fd, bn, O_CREAT|O_NOFOLLOW|O_NONBLOCK|O_CLOEXEC|O_WRONLY|O_NOCTTY, i->mode);
1390 mac_selinux_create_file_clear();
1391 }
1392
1393 if (fd < 0) {
1394 if (errno != EROFS)
1395 return log_error_errno(errno, "Failed to open/create file %s: %m", path);
1396
1397 /* On a read-only filesystem, we don't want to fail if the
1398 * target is already empty and the perms are set. So we still
1399 * proceed with the sanity checks and let the remaining
1400 * operations fail with EROFS if they try to modify the target
1401 * file. */
1402
1403 fd = openat(dir_fd, bn, O_NOFOLLOW|O_CLOEXEC|O_PATH, i->mode);
1404 if (fd < 0) {
1405 if (errno == ENOENT) {
1406 log_error("Cannot create file %s on a read-only file system.", path);
1407 return -EROFS;
1408 }
1409
1410 return log_error_errno(errno, "Failed to re-open file %s: %m", path);
1411 }
1412
1413 erofs = true;
1414 }
1415
1416 if (fstat(fd, &stbuf) < 0)
1417 return log_error_errno(errno, "stat(%s) failed: %m", path);
1418
1419 if (!S_ISREG(stbuf.st_mode)) {
1420 log_error("%s exists and is not a regular file.", path);
1421 return -EEXIST;
1422 }
1423
1424 if (stbuf.st_size > 0) {
1425 if (ftruncate(fd, 0) < 0) {
1426 r = erofs ? -EROFS : -errno;
1427 return log_error_errno(r, "Failed to truncate file %s: %m", path);
1428 }
1429 } else
1430 st = &stbuf;
1431
1432 log_debug("\"%s\" has been created.", path);
1433
1434 if (i->argument) {
1435 log_debug("Writing to \"%s\".", path);
1436
1437 r = loop_write(fd, i->argument, strlen(i->argument), false);
1438 if (r < 0) {
1439 r = erofs ? -EROFS : r;
1440 return log_error_errno(r, "Failed to write file %s: %m", path);
1441 }
1442 }
1443
1444 return fd_set_perms(i, fd, path, st);
1445 }
1446
1447 static int copy_files(Item *i) {
1448 _cleanup_close_ int dfd = -1, fd = -1;
1449 char *bn;
1450 int r;
1451
1452 log_debug("Copying tree \"%s\" to \"%s\".", i->argument, i->path);
1453
1454 bn = basename(i->path);
1455
1456 /* Validate the path and use the returned directory fd for copying the
1457 * target so we're sure that the path can't be changed behind our
1458 * back. */
1459 dfd = path_open_parent_safe(i->path);
1460 if (dfd < 0)
1461 return dfd;
1462
1463 r = copy_tree_at(AT_FDCWD, i->argument,
1464 dfd, bn,
1465 i->uid_set ? i->uid : UID_INVALID,
1466 i->gid_set ? i->gid : GID_INVALID,
1467 COPY_REFLINK | COPY_MERGE_EMPTY);
1468 if (r < 0) {
1469 struct stat a, b;
1470
1471 /* If the target already exists on read-only filesystems, trying
1472 * to create the target will not fail with EEXIST but with
1473 * EROFS. */
1474 if (r == -EROFS && faccessat(dfd, bn, F_OK, AT_SYMLINK_NOFOLLOW) == 0)
1475 r = -EEXIST;
1476
1477 if (r != -EEXIST)
1478 return log_error_errno(r, "Failed to copy files to %s: %m", i->path);
1479
1480 if (stat(i->argument, &a) < 0)
1481 return log_error_errno(errno, "stat(%s) failed: %m", i->argument);
1482
1483 if (fstatat(dfd, bn, &b, AT_SYMLINK_NOFOLLOW) < 0)
1484 return log_error_errno(errno, "stat(%s) failed: %m", i->path);
1485
1486 if ((a.st_mode ^ b.st_mode) & S_IFMT) {
1487 log_debug("Can't copy to %s, file exists already and is of different type", i->path);
1488 return 0;
1489 }
1490 }
1491
1492 fd = openat(dfd, bn, O_NOFOLLOW|O_CLOEXEC|O_PATH);
1493 if (fd < 0)
1494 return log_error_errno(errno, "Failed to openat(%s): %m", i->path);
1495
1496 return fd_set_perms(i, fd, i->path, NULL);
1497 }
1498
1499 typedef enum {
1500 CREATION_NORMAL,
1501 CREATION_EXISTING,
1502 CREATION_FORCE,
1503 _CREATION_MODE_MAX,
1504 _CREATION_MODE_INVALID = -1
1505 } CreationMode;
1506
1507 static const char *creation_mode_verb_table[_CREATION_MODE_MAX] = {
1508 [CREATION_NORMAL] = "Created",
1509 [CREATION_EXISTING] = "Found existing",
1510 [CREATION_FORCE] = "Created replacement",
1511 };
1512
1513 DEFINE_PRIVATE_STRING_TABLE_LOOKUP_TO_STRING(creation_mode_verb, CreationMode);
1514
1515 static int create_directory_or_subvolume(const char *path, mode_t mode, bool subvol, CreationMode *creation) {
1516 _cleanup_close_ int pfd = -1;
1517 CreationMode c;
1518 int r;
1519
1520 assert(path);
1521
1522 if (!creation)
1523 creation = &c;
1524
1525 pfd = path_open_parent_safe(path);
1526 if (pfd < 0)
1527 return pfd;
1528
1529 if (subvol) {
1530 if (btrfs_is_subvol(empty_to_root(arg_root)) <= 0)
1531
1532 /* Don't create a subvolume unless the root directory is
1533 * one, too. We do this under the assumption that if the
1534 * root directory is just a plain directory (i.e. very
1535 * light-weight), we shouldn't try to split it up into
1536 * subvolumes (i.e. more heavy-weight). Thus, chroot()
1537 * environments and suchlike will get a full brtfs
1538 * subvolume set up below their tree only if they
1539 * specifically set up a btrfs subvolume for the root
1540 * dir too. */
1541
1542 subvol = false;
1543 else {
1544 RUN_WITH_UMASK((~mode) & 0777)
1545 r = btrfs_subvol_make_fd(pfd, basename(path));
1546 }
1547 } else
1548 r = 0;
1549
1550 if (!subvol || r == -ENOTTY)
1551 RUN_WITH_UMASK(0000)
1552 r = mkdirat_label(pfd, basename(path), mode);
1553
1554 if (r < 0) {
1555 int k;
1556
1557 if (!IN_SET(r, -EEXIST, -EROFS))
1558 return log_error_errno(r, "Failed to create directory or subvolume \"%s\": %m", path);
1559
1560 k = is_dir_fd(pfd);
1561 if (k == -ENOENT && r == -EROFS)
1562 return log_error_errno(r, "%s does not exist and cannot be created as the file system is read-only.", path);
1563 if (k < 0)
1564 return log_error_errno(k, "Failed to check if %s exists: %m", path);
1565 if (!k) {
1566 log_warning("\"%s\" already exists and is not a directory.", path);
1567 return -EEXIST;
1568 }
1569
1570 *creation = CREATION_EXISTING;
1571 } else
1572 *creation = CREATION_NORMAL;
1573
1574 log_debug("%s directory \"%s\".", creation_mode_verb_to_string(*creation), path);
1575
1576 r = openat(pfd, basename(path), O_NOCTTY|O_CLOEXEC|O_DIRECTORY);
1577 if (r < 0)
1578 return log_error_errno(errno, "Failed to open directory '%s': %m", basename(path));
1579
1580 return r;
1581 }
1582
1583 static int create_directory(Item *i, const char *path) {
1584 _cleanup_close_ int fd = -1;
1585
1586 assert(i);
1587 assert(IN_SET(i->type, CREATE_DIRECTORY, TRUNCATE_DIRECTORY));
1588
1589 fd = create_directory_or_subvolume(path, i->mode, false, NULL);
1590 if (fd == -EEXIST)
1591 return 0;
1592 if (fd < 0)
1593 return fd;
1594
1595 return fd_set_perms(i, fd, path, NULL);
1596 }
1597
1598 static int create_subvolume(Item *i, const char *path) {
1599 _cleanup_close_ int fd = -1;
1600 CreationMode creation;
1601 int r, q = 0;
1602
1603 assert(i);
1604 assert(IN_SET(i->type, CREATE_SUBVOLUME, CREATE_SUBVOLUME_NEW_QUOTA, CREATE_SUBVOLUME_INHERIT_QUOTA));
1605
1606 fd = create_directory_or_subvolume(path, i->mode, true, &creation);
1607 if (fd == -EEXIST)
1608 return 0;
1609 if (fd < 0)
1610 return fd;
1611
1612 if (creation == CREATION_NORMAL &&
1613 IN_SET(i->type, CREATE_SUBVOLUME_NEW_QUOTA, CREATE_SUBVOLUME_INHERIT_QUOTA)) {
1614 r = btrfs_subvol_auto_qgroup_fd(fd, 0, i->type == CREATE_SUBVOLUME_NEW_QUOTA);
1615 if (r == -ENOTTY)
1616 log_debug_errno(r, "Couldn't adjust quota for subvolume \"%s\" (unsupported fs or dir not a subvolume): %m", i->path);
1617 else if (r == -EROFS)
1618 log_debug_errno(r, "Couldn't adjust quota for subvolume \"%s\" (fs is read-only).", i->path);
1619 else if (r == -ENOPROTOOPT)
1620 log_debug_errno(r, "Couldn't adjust quota for subvolume \"%s\" (quota support is disabled).", i->path);
1621 else if (r < 0)
1622 q = log_error_errno(r, "Failed to adjust quota for subvolume \"%s\": %m", i->path);
1623 else if (r > 0)
1624 log_debug("Adjusted quota for subvolume \"%s\".", i->path);
1625 else if (r == 0)
1626 log_debug("Quota for subvolume \"%s\" already in place, no change made.", i->path);
1627 }
1628
1629 r = fd_set_perms(i, fd, path, NULL);
1630 if (q < 0) /* prefer the quota change error from above */
1631 return q;
1632
1633 return r;
1634 }
1635
1636 static int empty_directory(Item *i, const char *path) {
1637 int r;
1638
1639 assert(i);
1640 assert(i->type == EMPTY_DIRECTORY);
1641
1642 r = is_dir(path, false);
1643 if (r == -ENOENT) {
1644 /* Option "e" operates only on existing objects. Do not
1645 * print errors about non-existent files or directories */
1646 log_debug("Skipping missing directory: %s", path);
1647 return 0;
1648 }
1649 if (r < 0)
1650 return log_error_errno(r, "is_dir() failed on path %s: %m", path);
1651 if (r == 0)
1652 return log_error_errno(SYNTHETIC_ERRNO(EEXIST),
1653 "'%s' already exists and is not a directory.",
1654 path);
1655
1656 return path_set_perms(i, path);
1657 }
1658
1659 static int create_device(Item *i, mode_t file_type) {
1660 _cleanup_close_ int dfd = -1, fd = -1;
1661 CreationMode creation;
1662 char *bn;
1663 int r;
1664
1665 assert(i);
1666 assert(IN_SET(file_type, S_IFBLK, S_IFCHR));
1667
1668 bn = basename(i->path);
1669
1670 /* Validate the path and use the returned directory fd for copying the
1671 * target so we're sure that the path can't be changed behind our
1672 * back. */
1673 dfd = path_open_parent_safe(i->path);
1674 if (dfd < 0)
1675 return dfd;
1676
1677 RUN_WITH_UMASK(0000) {
1678 mac_selinux_create_file_prepare(i->path, file_type);
1679 r = mknodat(dfd, bn, i->mode | file_type, i->major_minor);
1680 mac_selinux_create_file_clear();
1681 }
1682
1683 if (r < 0) {
1684 struct stat st;
1685
1686 if (errno == EPERM) {
1687 log_debug("We lack permissions, possibly because of cgroup configuration; "
1688 "skipping creation of device node %s.", i->path);
1689 return 0;
1690 }
1691
1692 if (errno != EEXIST)
1693 return log_error_errno(errno, "Failed to create device node %s: %m", i->path);
1694
1695 if (fstatat(dfd, bn, &st, 0) < 0)
1696 return log_error_errno(errno, "stat(%s) failed: %m", i->path);
1697
1698 if ((st.st_mode & S_IFMT) != file_type) {
1699
1700 if (i->force) {
1701
1702 RUN_WITH_UMASK(0000) {
1703 mac_selinux_create_file_prepare(i->path, file_type);
1704 /* FIXME: need to introduce mknodat_atomic() */
1705 r = mknod_atomic(i->path, i->mode | file_type, i->major_minor);
1706 mac_selinux_create_file_clear();
1707 }
1708
1709 if (r < 0)
1710 return log_error_errno(r, "Failed to create device node \"%s\": %m", i->path);
1711 creation = CREATION_FORCE;
1712 } else {
1713 log_debug("%s is not a device node.", i->path);
1714 return 0;
1715 }
1716 } else
1717 creation = CREATION_EXISTING;
1718 } else
1719 creation = CREATION_NORMAL;
1720
1721 log_debug("%s %s device node \"%s\" %u:%u.",
1722 creation_mode_verb_to_string(creation),
1723 i->type == CREATE_BLOCK_DEVICE ? "block" : "char",
1724 i->path, major(i->mode), minor(i->mode));
1725
1726 fd = openat(dfd, bn, O_NOFOLLOW|O_CLOEXEC|O_PATH);
1727 if (fd < 0)
1728 return log_error_errno(errno, "Failed to openat(%s): %m", i->path);
1729
1730 return fd_set_perms(i, fd, i->path, NULL);
1731 }
1732
1733 static int create_fifo(Item *i, const char *path) {
1734 _cleanup_close_ int pfd = -1, fd = -1;
1735 CreationMode creation;
1736 struct stat st;
1737 char *bn;
1738 int r;
1739
1740 pfd = path_open_parent_safe(path);
1741 if (pfd < 0)
1742 return pfd;
1743
1744 bn = basename(path);
1745
1746 RUN_WITH_UMASK(0000) {
1747 mac_selinux_create_file_prepare(path, S_IFIFO);
1748 r = mkfifoat(pfd, bn, i->mode);
1749 mac_selinux_create_file_clear();
1750 }
1751
1752 if (r < 0) {
1753 if (errno != EEXIST)
1754 return log_error_errno(errno, "Failed to create fifo %s: %m", path);
1755
1756 if (fstatat(pfd, bn, &st, AT_SYMLINK_NOFOLLOW) < 0)
1757 return log_error_errno(errno, "stat(%s) failed: %m", path);
1758
1759 if (!S_ISFIFO(st.st_mode)) {
1760
1761 if (i->force) {
1762 RUN_WITH_UMASK(0000) {
1763 mac_selinux_create_file_prepare(path, S_IFIFO);
1764 r = mkfifoat_atomic(pfd, bn, i->mode);
1765 mac_selinux_create_file_clear();
1766 }
1767
1768 if (r < 0)
1769 return log_error_errno(r, "Failed to create fifo %s: %m", path);
1770 creation = CREATION_FORCE;
1771 } else {
1772 log_warning("\"%s\" already exists and is not a fifo.", path);
1773 return 0;
1774 }
1775 } else
1776 creation = CREATION_EXISTING;
1777 } else
1778 creation = CREATION_NORMAL;
1779
1780 log_debug("%s fifo \"%s\".", creation_mode_verb_to_string(creation), path);
1781
1782 fd = openat(pfd, bn, O_NOFOLLOW|O_CLOEXEC|O_PATH);
1783 if (fd < 0)
1784 return log_error_errno(errno, "Failed to openat(%s): %m", path);
1785
1786 return fd_set_perms(i, fd, i->path, NULL);
1787 }
1788
1789 typedef int (*action_t)(Item *i, const char *path);
1790 typedef int (*fdaction_t)(Item *i, int fd, const char *path, const struct stat *st);
1791
1792 static int item_do(Item *i, int fd, const char *path, fdaction_t action) {
1793 struct stat st;
1794 int r = 0, q;
1795
1796 assert(i);
1797 assert(path);
1798 assert(fd >= 0);
1799
1800 if (fstat(fd, &st) < 0) {
1801 r = log_error_errno(errno, "fstat() on file failed: %m");
1802 goto finish;
1803 }
1804
1805 /* This returns the first error we run into, but nevertheless
1806 * tries to go on */
1807 r = action(i, fd, path, &st);
1808
1809 if (S_ISDIR(st.st_mode)) {
1810 char procfs_path[STRLEN("/proc/self/fd/") + DECIMAL_STR_MAX(int)];
1811 _cleanup_closedir_ DIR *d = NULL;
1812 struct dirent *de;
1813
1814 /* The passed 'fd' was opened with O_PATH. We need to convert
1815 * it into a 'regular' fd before reading the directory content. */
1816 xsprintf(procfs_path, "/proc/self/fd/%i", fd);
1817
1818 d = opendir(procfs_path);
1819 if (!d) {
1820 log_error_errno(errno, "Failed to opendir() '%s': %m", procfs_path);
1821 if (r == 0)
1822 r = -errno;
1823 goto finish;
1824 }
1825
1826 FOREACH_DIRENT_ALL(de, d, q = -errno; goto finish) {
1827 int de_fd;
1828
1829 if (dot_or_dot_dot(de->d_name))
1830 continue;
1831
1832 de_fd = openat(fd, de->d_name, O_NOFOLLOW|O_CLOEXEC|O_PATH);
1833 if (de_fd < 0)
1834 q = log_error_errno(errno, "Failed to open() file '%s': %m", de->d_name);
1835 else {
1836 _cleanup_free_ char *de_path = NULL;
1837
1838 de_path = path_join(path, de->d_name);
1839 if (!de_path)
1840 q = log_oom();
1841 else
1842 /* Pass ownership of dirent fd over */
1843 q = item_do(i, de_fd, de_path, action);
1844 }
1845
1846 if (q < 0 && r == 0)
1847 r = q;
1848 }
1849 }
1850 finish:
1851 safe_close(fd);
1852 return r;
1853 }
1854
1855 static int glob_item(Item *i, action_t action) {
1856 _cleanup_globfree_ glob_t g = {
1857 .gl_opendir = (void *(*)(const char *)) opendir_nomod,
1858 };
1859 int r = 0, k;
1860 char **fn;
1861
1862 k = safe_glob(i->path, GLOB_NOSORT|GLOB_BRACE, &g);
1863 if (k < 0 && k != -ENOENT)
1864 return log_error_errno(k, "glob(%s) failed: %m", i->path);
1865
1866 STRV_FOREACH(fn, g.gl_pathv) {
1867 k = action(i, *fn);
1868 if (k < 0 && r == 0)
1869 r = k;
1870 }
1871
1872 return r;
1873 }
1874
1875 static int glob_item_recursively(Item *i, fdaction_t action) {
1876 _cleanup_globfree_ glob_t g = {
1877 .gl_opendir = (void *(*)(const char *)) opendir_nomod,
1878 };
1879 int r = 0, k;
1880 char **fn;
1881
1882 k = safe_glob(i->path, GLOB_NOSORT|GLOB_BRACE, &g);
1883 if (k < 0 && k != -ENOENT)
1884 return log_error_errno(k, "glob(%s) failed: %m", i->path);
1885
1886 STRV_FOREACH(fn, g.gl_pathv) {
1887 _cleanup_close_ int fd = -1;
1888
1889 /* Make sure we won't trigger/follow file object (such as
1890 * device nodes, automounts, ...) pointed out by 'fn' with
1891 * O_PATH. Note, when O_PATH is used, flags other than
1892 * O_CLOEXEC, O_DIRECTORY, and O_NOFOLLOW are ignored. */
1893
1894 fd = open(*fn, O_CLOEXEC|O_NOFOLLOW|O_PATH);
1895 if (fd < 0) {
1896 log_error_errno(errno, "Opening '%s' failed: %m", *fn);
1897 if (r == 0)
1898 r = -errno;
1899 continue;
1900 }
1901
1902 k = item_do(i, fd, *fn, action);
1903 if (k < 0 && r == 0)
1904 r = k;
1905
1906 /* we passed fd ownership to the previous call */
1907 fd = -1;
1908 }
1909
1910 return r;
1911 }
1912
1913 static int create_item(Item *i) {
1914 CreationMode creation;
1915 int r = 0;
1916
1917 assert(i);
1918
1919 log_debug("Running create action for entry %c %s", (char) i->type, i->path);
1920
1921 switch (i->type) {
1922
1923 case IGNORE_PATH:
1924 case IGNORE_DIRECTORY_PATH:
1925 case REMOVE_PATH:
1926 case RECURSIVE_REMOVE_PATH:
1927 return 0;
1928
1929 case CREATE_FILE:
1930 RUN_WITH_UMASK(0000)
1931 (void) mkdir_parents_label(i->path, 0755);
1932
1933 r = create_file(i, i->path);
1934 if (r < 0)
1935 return r;
1936 break;
1937
1938 case TRUNCATE_FILE:
1939 RUN_WITH_UMASK(0000)
1940 (void) mkdir_parents_label(i->path, 0755);
1941
1942 r = truncate_file(i, i->path);
1943 if (r < 0)
1944 return r;
1945 break;
1946
1947 case COPY_FILES:
1948 RUN_WITH_UMASK(0000)
1949 (void) mkdir_parents_label(i->path, 0755);
1950
1951 r = copy_files(i);
1952 if (r < 0)
1953 return r;
1954 break;
1955
1956 case WRITE_FILE:
1957 r = glob_item(i, write_one_file);
1958 if (r < 0)
1959 return r;
1960
1961 break;
1962
1963 case CREATE_DIRECTORY:
1964 case TRUNCATE_DIRECTORY:
1965 RUN_WITH_UMASK(0000)
1966 (void) mkdir_parents_label(i->path, 0755);
1967
1968 r = create_directory(i, i->path);
1969 if (r < 0)
1970 return r;
1971 break;
1972
1973 case CREATE_SUBVOLUME:
1974 case CREATE_SUBVOLUME_INHERIT_QUOTA:
1975 case CREATE_SUBVOLUME_NEW_QUOTA:
1976 RUN_WITH_UMASK(0000)
1977 (void) mkdir_parents_label(i->path, 0755);
1978
1979 r = create_subvolume(i, i->path);
1980 if (r < 0)
1981 return r;
1982 break;
1983
1984 case EMPTY_DIRECTORY:
1985 r = glob_item(i, empty_directory);
1986 if (r < 0)
1987 return r;
1988 break;
1989
1990 case CREATE_FIFO:
1991 RUN_WITH_UMASK(0000)
1992 (void) mkdir_parents_label(i->path, 0755);
1993
1994 r = create_fifo(i, i->path);
1995 if (r < 0)
1996 return r;
1997 break;
1998
1999 case CREATE_SYMLINK: {
2000 RUN_WITH_UMASK(0000)
2001 (void) mkdir_parents_label(i->path, 0755);
2002
2003 mac_selinux_create_file_prepare(i->path, S_IFLNK);
2004 r = symlink(i->argument, i->path);
2005 mac_selinux_create_file_clear();
2006
2007 if (r < 0) {
2008 _cleanup_free_ char *x = NULL;
2009
2010 if (errno != EEXIST)
2011 return log_error_errno(errno, "symlink(%s, %s) failed: %m", i->argument, i->path);
2012
2013 r = readlink_malloc(i->path, &x);
2014 if (r < 0 || !streq(i->argument, x)) {
2015
2016 if (i->force) {
2017 mac_selinux_create_file_prepare(i->path, S_IFLNK);
2018 r = symlink_atomic(i->argument, i->path);
2019 mac_selinux_create_file_clear();
2020
2021 if (IN_SET(r, -EISDIR, -EEXIST, -ENOTEMPTY)) {
2022 r = rm_rf(i->path, REMOVE_ROOT|REMOVE_PHYSICAL);
2023 if (r < 0)
2024 return log_error_errno(r, "rm -fr %s failed: %m", i->path);
2025
2026 mac_selinux_create_file_prepare(i->path, S_IFLNK);
2027 r = symlink(i->argument, i->path) < 0 ? -errno : 0;
2028 mac_selinux_create_file_clear();
2029 }
2030 if (r < 0)
2031 return log_error_errno(r, "symlink(%s, %s) failed: %m", i->argument, i->path);
2032
2033 creation = CREATION_FORCE;
2034 } else {
2035 log_debug("\"%s\" is not a symlink or does not point to the correct path.", i->path);
2036 return 0;
2037 }
2038 } else
2039 creation = CREATION_EXISTING;
2040 } else
2041
2042 creation = CREATION_NORMAL;
2043 log_debug("%s symlink \"%s\".", creation_mode_verb_to_string(creation), i->path);
2044 break;
2045 }
2046
2047 case CREATE_BLOCK_DEVICE:
2048 case CREATE_CHAR_DEVICE:
2049 if (have_effective_cap(CAP_MKNOD) == 0) {
2050 /* In a container we lack CAP_MKNOD. We shouldn't attempt to create the device node in that
2051 * case to avoid noise, and we don't support virtualized devices in containers anyway. */
2052
2053 log_debug("We lack CAP_MKNOD, skipping creation of device node %s.", i->path);
2054 return 0;
2055 }
2056
2057 RUN_WITH_UMASK(0000)
2058 (void) mkdir_parents_label(i->path, 0755);
2059
2060 r = create_device(i, i->type == CREATE_BLOCK_DEVICE ? S_IFBLK : S_IFCHR);
2061 if (r < 0)
2062 return r;
2063
2064 break;
2065
2066 case ADJUST_MODE:
2067 case RELABEL_PATH:
2068 r = glob_item(i, path_set_perms);
2069 if (r < 0)
2070 return r;
2071 break;
2072
2073 case RECURSIVE_RELABEL_PATH:
2074 r = glob_item_recursively(i, fd_set_perms);
2075 if (r < 0)
2076 return r;
2077 break;
2078
2079 case SET_XATTR:
2080 r = glob_item(i, path_set_xattrs);
2081 if (r < 0)
2082 return r;
2083 break;
2084
2085 case RECURSIVE_SET_XATTR:
2086 r = glob_item_recursively(i, fd_set_xattrs);
2087 if (r < 0)
2088 return r;
2089 break;
2090
2091 case SET_ACL:
2092 r = glob_item(i, path_set_acls);
2093 if (r < 0)
2094 return r;
2095 break;
2096
2097 case RECURSIVE_SET_ACL:
2098 r = glob_item_recursively(i, fd_set_acls);
2099 if (r < 0)
2100 return r;
2101 break;
2102
2103 case SET_ATTRIBUTE:
2104 r = glob_item(i, path_set_attribute);
2105 if (r < 0)
2106 return r;
2107 break;
2108
2109 case RECURSIVE_SET_ATTRIBUTE:
2110 r = glob_item_recursively(i, fd_set_attribute);
2111 if (r < 0)
2112 return r;
2113 break;
2114 }
2115
2116 return 0;
2117 }
2118
2119 static int remove_item_instance(Item *i, const char *instance) {
2120 int r;
2121
2122 assert(i);
2123
2124 switch (i->type) {
2125
2126 case REMOVE_PATH:
2127 if (remove(instance) < 0 && errno != ENOENT)
2128 return log_error_errno(errno, "rm(%s): %m", instance);
2129
2130 break;
2131
2132 case RECURSIVE_REMOVE_PATH:
2133 /* FIXME: we probably should use dir_cleanup() here instead of rm_rf() so that 'x' is honoured. */
2134 log_debug("rm -rf \"%s\"", instance);
2135 r = rm_rf(instance, REMOVE_ROOT|REMOVE_SUBVOLUME|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 int r;
2150
2151 assert(i);
2152
2153 log_debug("Running remove action for entry %c %s", (char) i->type, i->path);
2154
2155 switch (i->type) {
2156
2157 case TRUNCATE_DIRECTORY:
2158 /* FIXME: we probably should use dir_cleanup() here instead of rm_rf() so that 'x' is honoured. */
2159 log_debug("rm -rf \"%s\"", i->path);
2160 r = rm_rf(i->path, REMOVE_PHYSICAL);
2161 if (r < 0 && r != -ENOENT)
2162 return log_error_errno(r, "rm_rf(%s): %m", i->path);
2163
2164 return 0;
2165
2166 case REMOVE_PATH:
2167 case RECURSIVE_REMOVE_PATH:
2168 return glob_item(i, remove_item_instance);
2169
2170 default:
2171 return 0;
2172 }
2173 }
2174
2175 static int clean_item_instance(Item *i, const char* instance) {
2176 _cleanup_closedir_ DIR *d = NULL;
2177 struct stat s, ps;
2178 bool mountpoint;
2179 usec_t cutoff, n;
2180 char timestamp[FORMAT_TIMESTAMP_MAX];
2181
2182 assert(i);
2183
2184 if (!i->age_set)
2185 return 0;
2186
2187 n = now(CLOCK_REALTIME);
2188 if (n < i->age)
2189 return 0;
2190
2191 cutoff = n - i->age;
2192
2193 d = opendir_nomod(instance);
2194 if (!d) {
2195 if (IN_SET(errno, ENOENT, ENOTDIR)) {
2196 log_debug_errno(errno, "Directory \"%s\": %m", instance);
2197 return 0;
2198 }
2199
2200 return log_error_errno(errno, "Failed to open directory %s: %m", instance);
2201 }
2202
2203 if (fstat(dirfd(d), &s) < 0)
2204 return log_error_errno(errno, "stat(%s) failed: %m", i->path);
2205
2206 if (!S_ISDIR(s.st_mode))
2207 return log_error_errno(SYNTHETIC_ERRNO(ENOTDIR),
2208 "%s is not a directory.", i->path);
2209
2210 if (fstatat(dirfd(d), "..", &ps, AT_SYMLINK_NOFOLLOW) != 0)
2211 return log_error_errno(errno, "stat(%s/..) failed: %m", i->path);
2212
2213 mountpoint = s.st_dev != ps.st_dev || s.st_ino == ps.st_ino;
2214
2215 log_debug("Cleanup threshold for %s \"%s\" is %s",
2216 mountpoint ? "mount point" : "directory",
2217 instance,
2218 format_timestamp_us(timestamp, sizeof(timestamp), cutoff));
2219
2220 return dir_cleanup(i, instance, d, &s, cutoff, s.st_dev, mountpoint,
2221 MAX_DEPTH, i->keep_first_level);
2222 }
2223
2224 static int clean_item(Item *i) {
2225 assert(i);
2226
2227 log_debug("Running clean action for entry %c %s", (char) i->type, i->path);
2228
2229 switch (i->type) {
2230 case CREATE_DIRECTORY:
2231 case CREATE_SUBVOLUME:
2232 case CREATE_SUBVOLUME_INHERIT_QUOTA:
2233 case CREATE_SUBVOLUME_NEW_QUOTA:
2234 case TRUNCATE_DIRECTORY:
2235 case IGNORE_PATH:
2236 case COPY_FILES:
2237 clean_item_instance(i, i->path);
2238 return 0;
2239 case EMPTY_DIRECTORY:
2240 case IGNORE_DIRECTORY_PATH:
2241 return glob_item(i, clean_item_instance);
2242 default:
2243 return 0;
2244 }
2245 }
2246
2247 static int process_item(Item *i, OperationMask operation) {
2248 OperationMask todo;
2249 int r, q, p;
2250
2251 assert(i);
2252
2253 todo = operation & ~i->done;
2254 if (todo == 0) /* Everything already done? */
2255 return 0;
2256
2257 i->done |= operation;
2258
2259 r = chase_symlinks(i->path, NULL, CHASE_NO_AUTOFS|CHASE_WARN, NULL);
2260 if (r == -EREMOTE) {
2261 log_notice_errno(r, "Skipping %s", i->path);
2262 return 0;
2263 }
2264 if (r < 0)
2265 log_debug_errno(r, "Failed to determine whether '%s' is below autofs, ignoring: %m", i->path);
2266
2267 r = FLAGS_SET(operation, OPERATION_CREATE) ? create_item(i) : 0;
2268 /* Failure can only be tolerated for create */
2269 if (i->allow_failure)
2270 r = 0;
2271
2272 q = FLAGS_SET(operation, OPERATION_REMOVE) ? remove_item(i) : 0;
2273 p = FLAGS_SET(operation, OPERATION_CLEAN) ? clean_item(i) : 0;
2274
2275 return r < 0 ? r :
2276 q < 0 ? q :
2277 p;
2278 }
2279
2280 static int process_item_array(ItemArray *array, OperationMask operation) {
2281 int r = 0;
2282 size_t n;
2283
2284 assert(array);
2285
2286 /* Create any parent first. */
2287 if (FLAGS_SET(operation, OPERATION_CREATE) && array->parent)
2288 r = process_item_array(array->parent, operation & OPERATION_CREATE);
2289
2290 /* Clean up all children first */
2291 if ((operation & (OPERATION_REMOVE|OPERATION_CLEAN)) && !set_isempty(array->children)) {
2292 Iterator i;
2293 ItemArray *c;
2294
2295 SET_FOREACH(c, array->children, i) {
2296 int k;
2297
2298 k = process_item_array(c, operation & (OPERATION_REMOVE|OPERATION_CLEAN));
2299 if (k < 0 && r == 0)
2300 r = k;
2301 }
2302 }
2303
2304 for (n = 0; n < array->n_items; n++) {
2305 int k;
2306
2307 k = process_item(array->items + n, operation);
2308 if (k < 0 && r == 0)
2309 r = k;
2310 }
2311
2312 return r;
2313 }
2314
2315 static void item_free_contents(Item *i) {
2316 assert(i);
2317 free(i->path);
2318 free(i->argument);
2319 strv_free(i->xattrs);
2320
2321 #if HAVE_ACL
2322 acl_free(i->acl_access);
2323 acl_free(i->acl_default);
2324 #endif
2325 }
2326
2327 static ItemArray* item_array_free(ItemArray *a) {
2328 size_t n;
2329
2330 if (!a)
2331 return NULL;
2332
2333 for (n = 0; n < a->n_items; n++)
2334 item_free_contents(a->items + n);
2335
2336 set_free(a->children);
2337 free(a->items);
2338 return mfree(a);
2339 }
2340
2341 static int item_compare(const Item *a, const Item *b) {
2342 /* Make sure that the ownership taking item is put first, so
2343 * that we first create the node, and then can adjust it */
2344
2345 if (takes_ownership(a->type) && !takes_ownership(b->type))
2346 return -1;
2347 if (!takes_ownership(a->type) && takes_ownership(b->type))
2348 return 1;
2349
2350 return CMP(a->type, b->type);
2351 }
2352
2353 static bool item_compatible(Item *a, Item *b) {
2354 assert(a);
2355 assert(b);
2356 assert(streq(a->path, b->path));
2357
2358 if (takes_ownership(a->type) && takes_ownership(b->type))
2359 /* check if the items are the same */
2360 return streq_ptr(a->argument, b->argument) &&
2361
2362 a->uid_set == b->uid_set &&
2363 a->uid == b->uid &&
2364
2365 a->gid_set == b->gid_set &&
2366 a->gid == b->gid &&
2367
2368 a->mode_set == b->mode_set &&
2369 a->mode == b->mode &&
2370
2371 a->age_set == b->age_set &&
2372 a->age == b->age &&
2373
2374 a->mask_perms == b->mask_perms &&
2375
2376 a->keep_first_level == b->keep_first_level &&
2377
2378 a->major_minor == b->major_minor;
2379
2380 return true;
2381 }
2382
2383 static bool should_include_path(const char *path) {
2384 char **prefix;
2385
2386 STRV_FOREACH(prefix, arg_exclude_prefixes)
2387 if (path_startswith(path, *prefix)) {
2388 log_debug("Entry \"%s\" matches exclude prefix \"%s\", skipping.",
2389 path, *prefix);
2390 return false;
2391 }
2392
2393 STRV_FOREACH(prefix, arg_include_prefixes)
2394 if (path_startswith(path, *prefix)) {
2395 log_debug("Entry \"%s\" matches include prefix \"%s\".", path, *prefix);
2396 return true;
2397 }
2398
2399 /* no matches, so we should include this path only if we
2400 * have no whitelist at all */
2401 if (strv_isempty(arg_include_prefixes))
2402 return true;
2403
2404 log_debug("Entry \"%s\" does not match any include prefix, skipping.", path);
2405 return false;
2406 }
2407
2408 static int specifier_expansion_from_arg(Item *i) {
2409 _cleanup_free_ char *unescaped = NULL, *resolved = NULL;
2410 char **xattr;
2411 int r;
2412
2413 assert(i);
2414
2415 if (i->argument == NULL)
2416 return 0;
2417
2418 switch (i->type) {
2419 case COPY_FILES:
2420 case CREATE_SYMLINK:
2421 case CREATE_FILE:
2422 case TRUNCATE_FILE:
2423 case WRITE_FILE:
2424 r = cunescape(i->argument, 0, &unescaped);
2425 if (r < 0)
2426 return log_error_errno(r, "Failed to unescape parameter to write: %s", i->argument);
2427
2428 r = specifier_printf(unescaped, specifier_table, NULL, &resolved);
2429 if (r < 0)
2430 return r;
2431
2432 free_and_replace(i->argument, resolved);
2433 break;
2434
2435 case SET_XATTR:
2436 case RECURSIVE_SET_XATTR:
2437 assert(i->xattrs);
2438
2439 STRV_FOREACH (xattr, i->xattrs) {
2440 r = specifier_printf(*xattr, specifier_table, NULL, &resolved);
2441 if (r < 0)
2442 return r;
2443
2444 free_and_replace(*xattr, resolved);
2445 }
2446 break;
2447
2448 default:
2449 break;
2450 }
2451 return 0;
2452 }
2453
2454 static int patch_var_run(const char *fname, unsigned line, char **path) {
2455 const char *k;
2456 char *n;
2457
2458 assert(path);
2459 assert(*path);
2460
2461 /* Optionally rewrites lines referencing /var/run/, to use /run/ instead. Why bother? tmpfiles merges lines in
2462 * some cases and detects conflicts in others. If files/directories are specified through two equivalent lines
2463 * this is problematic as neither case will be detected. Ideally we'd detect these cases by resolving symlinks
2464 * early, but that's precisely not what we can do here as this code very likely is running very early on, at a
2465 * time where the paths in question are not available yet, or even more importantly, our own tmpfiles rules
2466 * might create the paths that are intermediary to the listed paths. We can't really cover the generic case,
2467 * but the least we can do is cover the specific case of /var/run vs. /run, as /var/run is a legacy name for
2468 * /run only, and we explicitly document that and require that on systemd systems the former is a symlink to
2469 * the latter. Moreover files below this path are by far the primary usecase for tmpfiles.d/. */
2470
2471 k = path_startswith(*path, "/var/run/");
2472 if (isempty(k)) /* Don't complain about other paths than /var/run, and not about /var/run itself either. */
2473 return 0;
2474
2475 n = strjoin("/run/", k);
2476 if (!n)
2477 return log_oom();
2478
2479 /* Also log about this briefly. We do so at LOG_NOTICE level, as we fixed up the situation automatically, hence
2480 * there's no immediate need for action by the user. However, in the interest of making things less confusing
2481 * to the user, let's still inform the user that these snippets should really be updated. */
2482
2483 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);
2484
2485 free_and_replace(*path, n);
2486
2487 return 0;
2488 }
2489
2490 static int parse_line(const char *fname, unsigned line, const char *buffer, bool *invalid_config) {
2491
2492 _cleanup_free_ char *action = NULL, *mode = NULL, *user = NULL, *group = NULL, *age = NULL, *path = NULL;
2493 _cleanup_(item_free_contents) Item i = {};
2494 ItemArray *existing;
2495 OrderedHashmap *h;
2496 int r, pos;
2497 bool force = false, boot = false, allow_failure = false;
2498
2499 assert(fname);
2500 assert(line >= 1);
2501 assert(buffer);
2502
2503 r = extract_many_words(
2504 &buffer,
2505 NULL,
2506 EXTRACT_QUOTES,
2507 &action,
2508 &path,
2509 &mode,
2510 &user,
2511 &group,
2512 &age,
2513 NULL);
2514 if (r < 0) {
2515 if (IN_SET(r, -EINVAL, -EBADSLT))
2516 /* invalid quoting and such or an unknown specifier */
2517 *invalid_config = true;
2518 return log_error_errno(r, "[%s:%u] Failed to parse line: %m", fname, line);
2519 } else if (r < 2) {
2520 *invalid_config = true;
2521 log_error("[%s:%u] Syntax error.", fname, line);
2522 return -EIO;
2523 }
2524
2525 if (!isempty(buffer) && !streq(buffer, "-")) {
2526 i.argument = strdup(buffer);
2527 if (!i.argument)
2528 return log_oom();
2529 }
2530
2531 if (isempty(action)) {
2532 *invalid_config = true;
2533 log_error("[%s:%u] Command too short '%s'.", fname, line, action);
2534 return -EINVAL;
2535 }
2536
2537 for (pos = 1; action[pos]; pos++) {
2538 if (action[pos] == '!' && !boot)
2539 boot = true;
2540 else if (action[pos] == '+' && !force)
2541 force = true;
2542 else if (action[pos] == '-' && !allow_failure)
2543 allow_failure = true;
2544 else {
2545 *invalid_config = true;
2546 log_error("[%s:%u] Unknown modifiers in command '%s'",
2547 fname, line, action);
2548 return -EINVAL;
2549 }
2550 }
2551
2552 if (boot && !arg_boot) {
2553 log_debug("Ignoring entry %s \"%s\" because --boot is not specified.",
2554 action, path);
2555 return 0;
2556 }
2557
2558 i.type = action[0];
2559 i.force = force;
2560 i.allow_failure = allow_failure;
2561
2562 r = specifier_printf(path, specifier_table, NULL, &i.path);
2563 if (r == -ENXIO)
2564 return log_unresolvable_specifier(fname, line);
2565 if (r < 0) {
2566 if (IN_SET(r, -EINVAL, -EBADSLT))
2567 *invalid_config = true;
2568 return log_error_errno(r, "[%s:%u] Failed to replace specifiers: %s", fname, line, path);
2569 }
2570
2571 r = patch_var_run(fname, line, &i.path);
2572 if (r < 0)
2573 return r;
2574
2575 switch (i.type) {
2576
2577 case CREATE_DIRECTORY:
2578 case CREATE_SUBVOLUME:
2579 case CREATE_SUBVOLUME_INHERIT_QUOTA:
2580 case CREATE_SUBVOLUME_NEW_QUOTA:
2581 case EMPTY_DIRECTORY:
2582 case TRUNCATE_DIRECTORY:
2583 case CREATE_FIFO:
2584 case IGNORE_PATH:
2585 case IGNORE_DIRECTORY_PATH:
2586 case REMOVE_PATH:
2587 case RECURSIVE_REMOVE_PATH:
2588 case ADJUST_MODE:
2589 case RELABEL_PATH:
2590 case RECURSIVE_RELABEL_PATH:
2591 if (i.argument)
2592 log_warning("[%s:%u] %c lines don't take argument fields, ignoring.", fname, line, i.type);
2593
2594 break;
2595
2596 case CREATE_FILE:
2597 case TRUNCATE_FILE:
2598 break;
2599
2600 case CREATE_SYMLINK:
2601 if (!i.argument) {
2602 i.argument = strappend("/usr/share/factory/", i.path);
2603 if (!i.argument)
2604 return log_oom();
2605 }
2606 break;
2607
2608 case WRITE_FILE:
2609 if (!i.argument) {
2610 *invalid_config = true;
2611 log_error("[%s:%u] Write file requires argument.", fname, line);
2612 return -EBADMSG;
2613 }
2614 break;
2615
2616 case COPY_FILES:
2617 if (!i.argument) {
2618 i.argument = strappend("/usr/share/factory/", i.path);
2619 if (!i.argument)
2620 return log_oom();
2621 } else if (!path_is_absolute(i.argument)) {
2622 *invalid_config = true;
2623 log_error("[%s:%u] Source path is not absolute.", fname, line);
2624 return -EBADMSG;
2625 }
2626
2627 path_simplify(i.argument, false);
2628 break;
2629
2630 case CREATE_CHAR_DEVICE:
2631 case CREATE_BLOCK_DEVICE:
2632 if (!i.argument) {
2633 *invalid_config = true;
2634 log_error("[%s:%u] Device file requires argument.", fname, line);
2635 return -EBADMSG;
2636 }
2637
2638 r = parse_dev(i.argument, &i.major_minor);
2639 if (r < 0) {
2640 *invalid_config = true;
2641 log_error_errno(r, "[%s:%u] Can't parse device file major/minor '%s'.", fname, line, i.argument);
2642 return -EBADMSG;
2643 }
2644
2645 break;
2646
2647 case SET_XATTR:
2648 case RECURSIVE_SET_XATTR:
2649 if (!i.argument) {
2650 *invalid_config = true;
2651 log_error("[%s:%u] Set extended attribute requires argument.", fname, line);
2652 return -EBADMSG;
2653 }
2654 r = parse_xattrs_from_arg(&i);
2655 if (r < 0)
2656 return r;
2657 break;
2658
2659 case SET_ACL:
2660 case RECURSIVE_SET_ACL:
2661 if (!i.argument) {
2662 *invalid_config = true;
2663 log_error("[%s:%u] Set ACLs requires argument.", fname, line);
2664 return -EBADMSG;
2665 }
2666 r = parse_acls_from_arg(&i);
2667 if (r < 0)
2668 return r;
2669 break;
2670
2671 case SET_ATTRIBUTE:
2672 case RECURSIVE_SET_ATTRIBUTE:
2673 if (!i.argument) {
2674 *invalid_config = true;
2675 log_error("[%s:%u] Set file attribute requires argument.", fname, line);
2676 return -EBADMSG;
2677 }
2678 r = parse_attribute_from_arg(&i);
2679 if (IN_SET(r, -EINVAL, -EBADSLT))
2680 *invalid_config = true;
2681 if (r < 0)
2682 return r;
2683 break;
2684
2685 default:
2686 log_error("[%s:%u] Unknown command type '%c'.", fname, line, (char) i.type);
2687 *invalid_config = true;
2688 return -EBADMSG;
2689 }
2690
2691 if (!path_is_absolute(i.path)) {
2692 log_error("[%s:%u] Path '%s' not absolute.", fname, line, i.path);
2693 *invalid_config = true;
2694 return -EBADMSG;
2695 }
2696
2697 path_simplify(i.path, false);
2698
2699 if (!should_include_path(i.path))
2700 return 0;
2701
2702 r = specifier_expansion_from_arg(&i);
2703 if (r == -ENXIO)
2704 return log_unresolvable_specifier(fname, line);
2705 if (r < 0) {
2706 if (IN_SET(r, -EINVAL, -EBADSLT))
2707 *invalid_config = true;
2708 return log_error_errno(r, "[%s:%u] Failed to substitute specifiers in argument: %m",
2709 fname, line);
2710 }
2711
2712 if (arg_root) {
2713 char *p;
2714
2715 p = prefix_root(arg_root, i.path);
2716 if (!p)
2717 return log_oom();
2718
2719 free_and_replace(i.path, p);
2720 }
2721
2722 if (!isempty(user) && !streq(user, "-")) {
2723 const char *u = user;
2724
2725 r = get_user_creds(&u, &i.uid, NULL, NULL, NULL, USER_CREDS_ALLOW_MISSING);
2726 if (r < 0) {
2727 *invalid_config = true;
2728 return log_error_errno(r, "[%s:%u] Unknown user '%s'.", fname, line, user);
2729 }
2730
2731 i.uid_set = true;
2732 }
2733
2734 if (!isempty(group) && !streq(group, "-")) {
2735 const char *g = group;
2736
2737 r = get_group_creds(&g, &i.gid, USER_CREDS_ALLOW_MISSING);
2738 if (r < 0) {
2739 *invalid_config = true;
2740 log_error("[%s:%u] Unknown group '%s'.", fname, line, group);
2741 return r;
2742 }
2743
2744 i.gid_set = true;
2745 }
2746
2747 if (!isempty(mode) && !streq(mode, "-")) {
2748 const char *mm = mode;
2749 unsigned m;
2750
2751 if (*mm == '~') {
2752 i.mask_perms = true;
2753 mm++;
2754 }
2755
2756 if (parse_mode(mm, &m) < 0) {
2757 *invalid_config = true;
2758 log_error("[%s:%u] Invalid mode '%s'.", fname, line, mode);
2759 return -EBADMSG;
2760 }
2761
2762 i.mode = m;
2763 i.mode_set = true;
2764 } else
2765 i.mode = IN_SET(i.type, CREATE_DIRECTORY, TRUNCATE_DIRECTORY, CREATE_SUBVOLUME, CREATE_SUBVOLUME_INHERIT_QUOTA, CREATE_SUBVOLUME_NEW_QUOTA) ? 0755 : 0644;
2766
2767 if (!isempty(age) && !streq(age, "-")) {
2768 const char *a = age;
2769
2770 if (*a == '~') {
2771 i.keep_first_level = true;
2772 a++;
2773 }
2774
2775 if (parse_sec(a, &i.age) < 0) {
2776 *invalid_config = true;
2777 log_error("[%s:%u] Invalid age '%s'.", fname, line, age);
2778 return -EBADMSG;
2779 }
2780
2781 i.age_set = true;
2782 }
2783
2784 h = needs_glob(i.type) ? globs : items;
2785
2786 existing = ordered_hashmap_get(h, i.path);
2787 if (existing) {
2788 size_t n;
2789
2790 for (n = 0; n < existing->n_items; n++) {
2791 if (!item_compatible(existing->items + n, &i)) {
2792 log_notice("[%s:%u] Duplicate line for path \"%s\", ignoring.",
2793 fname, line, i.path);
2794 return 0;
2795 }
2796 }
2797 } else {
2798 existing = new0(ItemArray, 1);
2799 if (!existing)
2800 return log_oom();
2801
2802 r = ordered_hashmap_put(h, i.path, existing);
2803 if (r < 0) {
2804 free(existing);
2805 return log_oom();
2806 }
2807 }
2808
2809 if (!GREEDY_REALLOC(existing->items, existing->allocated, existing->n_items + 1))
2810 return log_oom();
2811
2812 existing->items[existing->n_items++] = i;
2813 i = (struct Item) {};
2814
2815 /* Sort item array, to enforce stable ordering of application */
2816 typesafe_qsort(existing->items, existing->n_items, item_compare);
2817
2818 return 0;
2819 }
2820
2821 static int cat_config(char **config_dirs, char **args) {
2822 _cleanup_strv_free_ char **files = NULL;
2823 int r;
2824
2825 r = conf_files_list_with_replacement(arg_root, config_dirs, arg_replace, &files, NULL);
2826 if (r < 0)
2827 return r;
2828
2829 return cat_files(NULL, files, 0);
2830 }
2831
2832 static int help(void) {
2833 _cleanup_free_ char *link = NULL;
2834 int r;
2835
2836 r = terminal_urlify_man("systemd-tmpfiles", "8", &link);
2837 if (r < 0)
2838 return log_oom();
2839
2840 printf("%s [OPTIONS...] [CONFIGURATION FILE...]\n\n"
2841 "Creates, deletes and cleans up volatile and temporary files and directories.\n\n"
2842 " -h --help Show this help\n"
2843 " --user Execute user configuration\n"
2844 " --version Show package version\n"
2845 " --cat-config Show configuration files\n"
2846 " --create Create marked files/directories\n"
2847 " --clean Clean up marked directories\n"
2848 " --remove Remove marked files/directories\n"
2849 " --boot Execute actions only safe at boot\n"
2850 " --prefix=PATH Only apply rules with the specified prefix\n"
2851 " --exclude-prefix=PATH Ignore rules with the specified prefix\n"
2852 " --root=PATH Operate on an alternate filesystem root\n"
2853 " --replace=PATH Treat arguments as replacement for PATH\n"
2854 " --no-pager Do not pipe output into a pager\n"
2855 "\nSee the %s for details.\n"
2856 , program_invocation_short_name
2857 , link
2858 );
2859
2860 return 0;
2861 }
2862
2863 static int parse_argv(int argc, char *argv[]) {
2864
2865 enum {
2866 ARG_VERSION = 0x100,
2867 ARG_CAT_CONFIG,
2868 ARG_USER,
2869 ARG_CREATE,
2870 ARG_CLEAN,
2871 ARG_REMOVE,
2872 ARG_BOOT,
2873 ARG_PREFIX,
2874 ARG_EXCLUDE_PREFIX,
2875 ARG_ROOT,
2876 ARG_REPLACE,
2877 ARG_NO_PAGER,
2878 };
2879
2880 static const struct option options[] = {
2881 { "help", no_argument, NULL, 'h' },
2882 { "user", no_argument, NULL, ARG_USER },
2883 { "version", no_argument, NULL, ARG_VERSION },
2884 { "cat-config", no_argument, NULL, ARG_CAT_CONFIG },
2885 { "create", no_argument, NULL, ARG_CREATE },
2886 { "clean", no_argument, NULL, ARG_CLEAN },
2887 { "remove", no_argument, NULL, ARG_REMOVE },
2888 { "boot", no_argument, NULL, ARG_BOOT },
2889 { "prefix", required_argument, NULL, ARG_PREFIX },
2890 { "exclude-prefix", required_argument, NULL, ARG_EXCLUDE_PREFIX },
2891 { "root", required_argument, NULL, ARG_ROOT },
2892 { "replace", required_argument, NULL, ARG_REPLACE },
2893 { "no-pager", no_argument, NULL, ARG_NO_PAGER },
2894 {}
2895 };
2896
2897 int c, r;
2898
2899 assert(argc >= 0);
2900 assert(argv);
2901
2902 while ((c = getopt_long(argc, argv, "h", options, NULL)) >= 0)
2903
2904 switch (c) {
2905
2906 case 'h':
2907 return help();
2908
2909 case ARG_VERSION:
2910 return version();
2911
2912 case ARG_CAT_CONFIG:
2913 arg_cat_config = true;
2914 break;
2915
2916 case ARG_USER:
2917 arg_user = true;
2918 break;
2919
2920 case ARG_CREATE:
2921 arg_operation |= OPERATION_CREATE;
2922 break;
2923
2924 case ARG_CLEAN:
2925 arg_operation |= OPERATION_CLEAN;
2926 break;
2927
2928 case ARG_REMOVE:
2929 arg_operation |= OPERATION_REMOVE;
2930 break;
2931
2932 case ARG_BOOT:
2933 arg_boot = true;
2934 break;
2935
2936 case ARG_PREFIX:
2937 if (strv_push(&arg_include_prefixes, optarg) < 0)
2938 return log_oom();
2939 break;
2940
2941 case ARG_EXCLUDE_PREFIX:
2942 if (strv_push(&arg_exclude_prefixes, optarg) < 0)
2943 return log_oom();
2944 break;
2945
2946 case ARG_ROOT:
2947 r = parse_path_argument_and_warn(optarg, true, &arg_root);
2948 if (r < 0)
2949 return r;
2950 break;
2951
2952 case ARG_REPLACE:
2953 if (!path_is_absolute(optarg) ||
2954 !endswith(optarg, ".conf"))
2955 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
2956 "The argument to --replace= must an absolute path to a config file");
2957
2958 arg_replace = optarg;
2959 break;
2960
2961 case ARG_NO_PAGER:
2962 arg_pager_flags |= PAGER_DISABLE;
2963 break;
2964
2965 case '?':
2966 return -EINVAL;
2967
2968 default:
2969 assert_not_reached("Unhandled option");
2970 }
2971
2972 if (arg_operation == 0 && !arg_cat_config)
2973 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
2974 "You need to specify at least one of --clean, --create or --remove.");
2975
2976 if (arg_replace && arg_cat_config)
2977 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
2978 "Option --replace= is not supported with --cat-config");
2979
2980 if (arg_replace && optind >= argc)
2981 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
2982 "When --replace= is given, some configuration items must be specified");
2983
2984 return 1;
2985 }
2986
2987 static int read_config_file(char **config_dirs, const char *fn, bool ignore_enoent, bool *invalid_config) {
2988 _cleanup_fclose_ FILE *_f = NULL;
2989 Iterator iterator;
2990 unsigned v = 0;
2991 FILE *f;
2992 Item *i;
2993 int r = 0;
2994
2995 assert(fn);
2996
2997 if (streq(fn, "-")) {
2998 log_debug("Reading config from stdin…");
2999 fn = "<stdin>";
3000 f = stdin;
3001 } else {
3002 r = search_and_fopen(fn, "re", arg_root, (const char**) config_dirs, &_f);
3003 if (r < 0) {
3004 if (ignore_enoent && r == -ENOENT) {
3005 log_debug_errno(r, "Failed to open \"%s\", ignoring: %m", fn);
3006 return 0;
3007 }
3008
3009 return log_error_errno(r, "Failed to open '%s': %m", fn);
3010 }
3011 log_debug("Reading config file \"%s\"…", fn);
3012 f = _f;
3013 }
3014
3015 for (;;) {
3016 _cleanup_free_ char *line = NULL;
3017 bool invalid_line = false;
3018 char *l;
3019 int k;
3020
3021 k = read_line(f, LONG_LINE_MAX, &line);
3022 if (k < 0)
3023 return log_error_errno(k, "Failed to read '%s': %m", fn);
3024 if (k == 0)
3025 break;
3026
3027 v++;
3028
3029 l = strstrip(line);
3030 if (IN_SET(*l, 0, '#'))
3031 continue;
3032
3033 k = parse_line(fn, v, l, &invalid_line);
3034 if (k < 0) {
3035 if (invalid_line)
3036 /* Allow reporting with a special code if the caller requested this */
3037 *invalid_config = true;
3038 else if (r == 0)
3039 /* The first error becomes our return value */
3040 r = k;
3041 }
3042 }
3043
3044 /* we have to determine age parameter for each entry of type X */
3045 ORDERED_HASHMAP_FOREACH(i, globs, iterator) {
3046 Iterator iter;
3047 Item *j, *candidate_item = NULL;
3048
3049 if (i->type != IGNORE_DIRECTORY_PATH)
3050 continue;
3051
3052 ORDERED_HASHMAP_FOREACH(j, items, iter) {
3053 if (!IN_SET(j->type, CREATE_DIRECTORY, TRUNCATE_DIRECTORY, CREATE_SUBVOLUME, CREATE_SUBVOLUME_INHERIT_QUOTA, CREATE_SUBVOLUME_NEW_QUOTA))
3054 continue;
3055
3056 if (path_equal(j->path, i->path)) {
3057 candidate_item = j;
3058 break;
3059 }
3060
3061 if ((!candidate_item && path_startswith(i->path, j->path)) ||
3062 (candidate_item && path_startswith(j->path, candidate_item->path) && (fnmatch(i->path, j->path, FNM_PATHNAME | FNM_PERIOD) == 0)))
3063 candidate_item = j;
3064 }
3065
3066 if (candidate_item && candidate_item->age_set) {
3067 i->age = candidate_item->age;
3068 i->age_set = true;
3069 }
3070 }
3071
3072 if (ferror(f)) {
3073 log_error_errno(errno, "Failed to read from file %s: %m", fn);
3074 if (r == 0)
3075 r = -EIO;
3076 }
3077
3078 return r;
3079 }
3080
3081 static int parse_arguments(char **config_dirs, char **args, bool *invalid_config) {
3082 char **arg;
3083 int r;
3084
3085 STRV_FOREACH(arg, args) {
3086 r = read_config_file(config_dirs, *arg, false, invalid_config);
3087 if (r < 0)
3088 return r;
3089 }
3090
3091 return 0;
3092 }
3093
3094 static int read_config_files(char **config_dirs, char **args, bool *invalid_config) {
3095 _cleanup_strv_free_ char **files = NULL;
3096 _cleanup_free_ char *p = NULL;
3097 char **f;
3098 int r;
3099
3100 r = conf_files_list_with_replacement(arg_root, config_dirs, arg_replace, &files, &p);
3101 if (r < 0)
3102 return r;
3103
3104 STRV_FOREACH(f, files)
3105 if (p && path_equal(*f, p)) {
3106 log_debug("Parsing arguments at position \"%s\"…", *f);
3107
3108 r = parse_arguments(config_dirs, args, invalid_config);
3109 if (r < 0)
3110 return r;
3111 } else
3112 /* Just warn, ignore result otherwise.
3113 * read_config_file() has some debug output, so no need to print anything. */
3114 (void) read_config_file(config_dirs, *f, true, invalid_config);
3115
3116 return 0;
3117 }
3118
3119 static int link_parent(ItemArray *a) {
3120 const char *path;
3121 char *prefix;
3122 int r;
3123
3124 assert(a);
3125
3126 /* Finds the closest "parent" item array for the specified item array. Then registers the specified item array
3127 * as child of it, and fills the parent in, linking them both ways. This allows us to later create parents
3128 * before their children, and clean up/remove children before their parents. */
3129
3130 if (a->n_items <= 0)
3131 return 0;
3132
3133 path = a->items[0].path;
3134 prefix = newa(char, strlen(path) + 1);
3135 PATH_FOREACH_PREFIX(prefix, path) {
3136 ItemArray *j;
3137
3138 j = ordered_hashmap_get(items, prefix);
3139 if (!j)
3140 j = ordered_hashmap_get(globs, prefix);
3141 if (j) {
3142 r = set_ensure_allocated(&j->children, NULL);
3143 if (r < 0)
3144 return log_oom();
3145
3146 r = set_put(j->children, a);
3147 if (r < 0)
3148 return log_oom();
3149
3150 a->parent = j;
3151 return 1;
3152 }
3153 }
3154
3155 return 0;
3156 }
3157
3158 DEFINE_PRIVATE_HASH_OPS_WITH_VALUE_DESTRUCTOR(item_array_hash_ops, char, string_hash_func, string_compare_func,
3159 ItemArray, item_array_free);
3160
3161 static int run(int argc, char *argv[]) {
3162 _cleanup_strv_free_ char **config_dirs = NULL;
3163 bool invalid_config = false;
3164 Iterator iterator;
3165 ItemArray *a;
3166 enum {
3167 PHASE_REMOVE_AND_CLEAN,
3168 PHASE_CREATE,
3169 _PHASE_MAX
3170 } phase;
3171 int r, k;
3172
3173 r = parse_argv(argc, argv);
3174 if (r <= 0)
3175 return r;
3176
3177 log_setup_service();
3178
3179 /* Descending down file system trees might take a lot of fds */
3180 (void) rlimit_nofile_bump(HIGH_RLIMIT_NOFILE);
3181
3182 if (arg_user) {
3183 r = user_config_paths(&config_dirs);
3184 if (r < 0)
3185 return log_error_errno(r, "Failed to initialize configuration directory list: %m");
3186 } else {
3187 config_dirs = strv_split_nulstr(CONF_PATHS_NULSTR("tmpfiles.d"));
3188 if (!config_dirs)
3189 return log_oom();
3190 }
3191
3192 if (DEBUG_LOGGING) {
3193 _cleanup_free_ char *t = NULL;
3194
3195 t = strv_join(config_dirs, "\n\t");
3196 if (t)
3197 log_debug("Looking for configuration files in (higher priority first):\n\t%s", t);
3198 }
3199
3200 if (arg_cat_config) {
3201 (void) pager_open(arg_pager_flags);
3202
3203 return cat_config(config_dirs, argv + optind);
3204 }
3205
3206 umask(0022);
3207
3208 mac_selinux_init();
3209
3210 items = ordered_hashmap_new(&item_array_hash_ops);
3211 globs = ordered_hashmap_new(&item_array_hash_ops);
3212 if (!items || !globs)
3213 return log_oom();
3214
3215 /* If command line arguments are specified along with --replace, read all
3216 * configuration files and insert the positional arguments at the specified
3217 * place. Otherwise, if command line arguments are specified, execute just
3218 * them, and finally, without --replace= or any positional arguments, just
3219 * read configuration and execute it.
3220 */
3221 if (arg_replace || optind >= argc)
3222 r = read_config_files(config_dirs, argv + optind, &invalid_config);
3223 else
3224 r = parse_arguments(config_dirs, argv + optind, &invalid_config);
3225 if (r < 0)
3226 return r;
3227
3228 /* Let's now link up all child/parent relationships */
3229 ORDERED_HASHMAP_FOREACH(a, items, iterator) {
3230 r = link_parent(a);
3231 if (r < 0)
3232 return r;
3233 }
3234 ORDERED_HASHMAP_FOREACH(a, globs, iterator) {
3235 r = link_parent(a);
3236 if (r < 0)
3237 return r;
3238 }
3239
3240 /* If multiple operations are requested, let's first run the remove/clean operations, and only then the create
3241 * operations. i.e. that we first clean out the platform we then build on. */
3242 for (phase = 0; phase < _PHASE_MAX; phase++) {
3243 OperationMask op;
3244
3245 if (phase == PHASE_REMOVE_AND_CLEAN)
3246 op = arg_operation & (OPERATION_REMOVE|OPERATION_CLEAN);
3247 else if (phase == PHASE_CREATE)
3248 op = arg_operation & OPERATION_CREATE;
3249 else
3250 assert_not_reached("unexpected phase");
3251
3252 if (op == 0) /* Nothing requested in this phase */
3253 continue;
3254
3255 /* The non-globbing ones usually create things, hence we apply them first */
3256 ORDERED_HASHMAP_FOREACH(a, items, iterator) {
3257 k = process_item_array(a, op);
3258 if (k < 0 && r >= 0)
3259 r = k;
3260 }
3261
3262 /* The globbing ones usually alter things, hence we apply them second. */
3263 ORDERED_HASHMAP_FOREACH(a, globs, iterator) {
3264 k = process_item_array(a, op);
3265 if (k < 0 && r >= 0)
3266 r = k;
3267 }
3268 }
3269
3270 if (ERRNO_IS_RESOURCE(-r))
3271 return r;
3272 if (invalid_config)
3273 return EX_DATAERR;
3274 if (r < 0)
3275 return EX_CANTCREAT;
3276 return 0;
3277 }
3278
3279 DEFINE_MAIN_FUNCTION_WITH_POSITIVE_FAILURE(run);
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