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Merge pull request #15557 from poettering/journal-zero-fix
[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 <limits.h>
8 #include <linux/fs.h>
9 #include <stdbool.h>
10 #include <stddef.h>
11 #include <stdlib.h>
12 #include <sys/file.h>
13 #include <sys/xattr.h>
14 #include <sysexits.h>
15 #include <time.h>
16 #include <unistd.h>
17
18 #include "sd-path.h"
19
20 #include "acl-util.h"
21 #include "alloc-util.h"
22 #include "btrfs-util.h"
23 #include "capability-util.h"
24 #include "chattr-util.h"
25 #include "conf-files.h"
26 #include "copy.h"
27 #include "def.h"
28 #include "dirent-util.h"
29 #include "escape.h"
30 #include "fd-util.h"
31 #include "fileio.h"
32 #include "format-util.h"
33 #include "fs-util.h"
34 #include "glob-util.h"
35 #include "io-util.h"
36 #include "label.h"
37 #include "log.h"
38 #include "macro.h"
39 #include "main-func.h"
40 #include "mkdir.h"
41 #include "mountpoint-util.h"
42 #include "offline-passwd.h"
43 #include "pager.h"
44 #include "parse-util.h"
45 #include "path-lookup.h"
46 #include "path-util.h"
47 #include "pretty-print.h"
48 #include "rlimit-util.h"
49 #include "rm-rf.h"
50 #include "selinux-util.h"
51 #include "set.h"
52 #include "sort-util.h"
53 #include "specifier.h"
54 #include "stat-util.h"
55 #include "stdio-util.h"
56 #include "string-table.h"
57 #include "string-util.h"
58 #include "strv.h"
59 #include "umask-util.h"
60 #include "user-util.h"
61
62 /* This reads all files listed in /etc/tmpfiles.d/?*.conf and creates
63 * them in the file system. This is intended to be used to create
64 * properly owned directories beneath /tmp, /var/tmp, /run, which are
65 * volatile and hence need to be recreated on bootup. */
66
67 typedef enum OperationMask {
68 OPERATION_CREATE = 1 << 0,
69 OPERATION_REMOVE = 1 << 1,
70 OPERATION_CLEAN = 1 << 2,
71 } OperationMask;
72
73 typedef enum ItemType {
74 /* These ones take file names */
75 CREATE_FILE = 'f',
76 TRUNCATE_FILE = 'F', /* deprecated: use f+ */
77 CREATE_DIRECTORY = 'd',
78 TRUNCATE_DIRECTORY = 'D',
79 CREATE_SUBVOLUME = 'v',
80 CREATE_SUBVOLUME_INHERIT_QUOTA = 'q',
81 CREATE_SUBVOLUME_NEW_QUOTA = 'Q',
82 CREATE_FIFO = 'p',
83 CREATE_SYMLINK = 'L',
84 CREATE_CHAR_DEVICE = 'c',
85 CREATE_BLOCK_DEVICE = 'b',
86 COPY_FILES = 'C',
87
88 /* These ones take globs */
89 WRITE_FILE = 'w',
90 EMPTY_DIRECTORY = 'e',
91 SET_XATTR = 't',
92 RECURSIVE_SET_XATTR = 'T',
93 SET_ACL = 'a',
94 RECURSIVE_SET_ACL = 'A',
95 SET_ATTRIBUTE = 'h',
96 RECURSIVE_SET_ATTRIBUTE = 'H',
97 IGNORE_PATH = 'x',
98 IGNORE_DIRECTORY_PATH = 'X',
99 REMOVE_PATH = 'r',
100 RECURSIVE_REMOVE_PATH = 'R',
101 RELABEL_PATH = 'z',
102 RECURSIVE_RELABEL_PATH = 'Z',
103 ADJUST_MODE = 'm', /* legacy, 'z' is identical to this */
104 } ItemType;
105
106 typedef struct Item {
107 ItemType type;
108
109 char *path;
110 char *argument;
111 char **xattrs;
112 #if HAVE_ACL
113 acl_t acl_access;
114 acl_t acl_default;
115 #endif
116 uid_t uid;
117 gid_t gid;
118 mode_t mode;
119 usec_t age;
120
121 dev_t major_minor;
122 unsigned attribute_value;
123 unsigned attribute_mask;
124
125 bool uid_set:1;
126 bool gid_set:1;
127 bool mode_set:1;
128 bool age_set:1;
129 bool mask_perms:1;
130 bool attribute_set:1;
131
132 bool keep_first_level:1;
133
134 bool append_or_force:1;
135
136 bool allow_failure:1;
137
138 OperationMask done;
139 } Item;
140
141 typedef struct ItemArray {
142 Item *items;
143 size_t n_items;
144 size_t allocated;
145
146 struct ItemArray *parent;
147 Set *children;
148 } ItemArray;
149
150 typedef enum DirectoryType {
151 DIRECTORY_RUNTIME,
152 DIRECTORY_STATE,
153 DIRECTORY_CACHE,
154 DIRECTORY_LOGS,
155 _DIRECTORY_TYPE_MAX,
156 } DirectoryType;
157
158 static bool arg_cat_config = false;
159 static bool arg_user = false;
160 static OperationMask arg_operation = 0;
161 static bool arg_boot = false;
162 static PagerFlags arg_pager_flags = 0;
163
164 static char **arg_include_prefixes = NULL;
165 static char **arg_exclude_prefixes = NULL;
166 static char *arg_root = NULL;
167 static char *arg_replace = NULL;
168
169 #define MAX_DEPTH 256
170
171 static OrderedHashmap *items = NULL, *globs = NULL;
172 static Set *unix_sockets = NULL;
173
174 STATIC_DESTRUCTOR_REGISTER(items, ordered_hashmap_freep);
175 STATIC_DESTRUCTOR_REGISTER(globs, ordered_hashmap_freep);
176 STATIC_DESTRUCTOR_REGISTER(unix_sockets, set_free_freep);
177 STATIC_DESTRUCTOR_REGISTER(arg_include_prefixes, freep);
178 STATIC_DESTRUCTOR_REGISTER(arg_exclude_prefixes, freep);
179 STATIC_DESTRUCTOR_REGISTER(arg_root, freep);
180
181 static int specifier_machine_id_safe(char specifier, const void *data, const void *userdata, char **ret);
182 static int specifier_directory(char specifier, const void *data, const void *userdata, char **ret);
183
184 static const Specifier specifier_table[] = {
185 { 'm', specifier_machine_id_safe, NULL },
186 { 'b', specifier_boot_id, NULL },
187 { 'H', specifier_host_name, NULL },
188 { 'l', specifier_short_host_name, NULL },
189 { 'v', specifier_kernel_release, NULL },
190 { 'a', specifier_architecture, NULL },
191 { 'o', specifier_os_id, NULL },
192 { 'w', specifier_os_version_id, NULL },
193 { 'B', specifier_os_build_id, NULL },
194 { 'W', specifier_os_variant_id, NULL },
195
196 { 'g', specifier_group_name, NULL },
197 { 'G', specifier_group_id, NULL },
198 { 'U', specifier_user_id, NULL },
199 { 'u', specifier_user_name, NULL },
200 { 'h', specifier_user_home, NULL },
201
202 { 't', specifier_directory, UINT_TO_PTR(DIRECTORY_RUNTIME) },
203 { 'S', specifier_directory, UINT_TO_PTR(DIRECTORY_STATE) },
204 { 'C', specifier_directory, UINT_TO_PTR(DIRECTORY_CACHE) },
205 { 'L', specifier_directory, UINT_TO_PTR(DIRECTORY_LOGS) },
206 { 'T', specifier_tmp_dir, NULL },
207 { 'V', specifier_var_tmp_dir, NULL },
208 {}
209 };
210
211 static int specifier_machine_id_safe(char specifier, const void *data, const void *userdata, char **ret) {
212 int r;
213
214 /* If /etc/machine_id is missing or empty (e.g. in a chroot environment)
215 * return a recognizable error so that the caller can skip the rule
216 * gracefully. */
217
218 r = specifier_machine_id(specifier, data, userdata, ret);
219 if (IN_SET(r, -ENOENT, -ENOMEDIUM))
220 return -ENXIO;
221
222 return r;
223 }
224
225 static int specifier_directory(char specifier, const void *data, const void *userdata, char **ret) {
226 struct table_entry {
227 uint64_t type;
228 const char *suffix;
229 };
230
231 static const struct table_entry paths_system[] = {
232 [DIRECTORY_RUNTIME] = { SD_PATH_SYSTEM_RUNTIME },
233 [DIRECTORY_STATE] = { SD_PATH_SYSTEM_STATE_PRIVATE },
234 [DIRECTORY_CACHE] = { SD_PATH_SYSTEM_STATE_CACHE },
235 [DIRECTORY_LOGS] = { SD_PATH_SYSTEM_STATE_LOGS },
236 };
237
238 static const struct table_entry paths_user[] = {
239 [DIRECTORY_RUNTIME] = { SD_PATH_USER_RUNTIME },
240 [DIRECTORY_STATE] = { SD_PATH_USER_CONFIGURATION },
241 [DIRECTORY_CACHE] = { SD_PATH_USER_STATE_CACHE },
242 [DIRECTORY_LOGS] = { SD_PATH_USER_CONFIGURATION, "log" },
243 };
244
245 unsigned i;
246 const struct table_entry *paths;
247
248 assert_cc(ELEMENTSOF(paths_system) == ELEMENTSOF(paths_user));
249 paths = arg_user ? paths_user : paths_system;
250
251 i = PTR_TO_UINT(data);
252 assert(i < ELEMENTSOF(paths_system));
253
254 return sd_path_lookup(paths[i].type, paths[i].suffix, ret);
255 }
256
257 static int log_unresolvable_specifier(const char *filename, unsigned line) {
258 static bool notified = false;
259
260 /* In system mode, this is called when /etc is not fully initialized (e.g.
261 * in a chroot environment) where some specifiers are unresolvable. In user
262 * mode, this is called when some variables are not defined. These cases are
263 * not considered as an error so log at LOG_NOTICE only for the first time
264 * and then downgrade this to LOG_DEBUG for the rest. */
265
266 log_syntax(NULL,
267 notified ? LOG_DEBUG : LOG_NOTICE,
268 filename, line, 0,
269 "Failed to resolve specifier: %s, skipping",
270 arg_user ? "Required $XDG_... variable not defined" : "uninitialized /etc detected");
271
272 if (!notified)
273 log_notice("All rules containing unresolvable specifiers will be skipped.");
274
275 notified = true;
276 return 0;
277 }
278
279 static int user_config_paths(char*** ret) {
280 _cleanup_strv_free_ char **config_dirs = NULL, **data_dirs = NULL;
281 _cleanup_free_ char *persistent_config = NULL, *runtime_config = NULL, *data_home = NULL;
282 _cleanup_strv_free_ char **res = NULL;
283 int r;
284
285 r = xdg_user_dirs(&config_dirs, &data_dirs);
286 if (r < 0)
287 return r;
288
289 r = xdg_user_config_dir(&persistent_config, "/user-tmpfiles.d");
290 if (r < 0 && r != -ENXIO)
291 return r;
292
293 r = xdg_user_runtime_dir(&runtime_config, "/user-tmpfiles.d");
294 if (r < 0 && r != -ENXIO)
295 return r;
296
297 r = xdg_user_data_dir(&data_home, "/user-tmpfiles.d");
298 if (r < 0 && r != -ENXIO)
299 return r;
300
301 r = strv_extend_strv_concat(&res, config_dirs, "/user-tmpfiles.d");
302 if (r < 0)
303 return r;
304
305 r = strv_extend(&res, persistent_config);
306 if (r < 0)
307 return r;
308
309 r = strv_extend(&res, runtime_config);
310 if (r < 0)
311 return r;
312
313 r = strv_extend(&res, data_home);
314 if (r < 0)
315 return r;
316
317 r = strv_extend_strv_concat(&res, data_dirs, "/user-tmpfiles.d");
318 if (r < 0)
319 return r;
320
321 r = path_strv_make_absolute_cwd(res);
322 if (r < 0)
323 return r;
324
325 *ret = TAKE_PTR(res);
326 return 0;
327 }
328
329 static bool needs_glob(ItemType t) {
330 return IN_SET(t,
331 WRITE_FILE,
332 IGNORE_PATH,
333 IGNORE_DIRECTORY_PATH,
334 REMOVE_PATH,
335 RECURSIVE_REMOVE_PATH,
336 EMPTY_DIRECTORY,
337 ADJUST_MODE,
338 RELABEL_PATH,
339 RECURSIVE_RELABEL_PATH,
340 SET_XATTR,
341 RECURSIVE_SET_XATTR,
342 SET_ACL,
343 RECURSIVE_SET_ACL,
344 SET_ATTRIBUTE,
345 RECURSIVE_SET_ATTRIBUTE);
346 }
347
348 static bool takes_ownership(ItemType t) {
349 return IN_SET(t,
350 CREATE_FILE,
351 TRUNCATE_FILE,
352 CREATE_DIRECTORY,
353 EMPTY_DIRECTORY,
354 TRUNCATE_DIRECTORY,
355 CREATE_SUBVOLUME,
356 CREATE_SUBVOLUME_INHERIT_QUOTA,
357 CREATE_SUBVOLUME_NEW_QUOTA,
358 CREATE_FIFO,
359 CREATE_SYMLINK,
360 CREATE_CHAR_DEVICE,
361 CREATE_BLOCK_DEVICE,
362 COPY_FILES,
363 WRITE_FILE,
364 IGNORE_PATH,
365 IGNORE_DIRECTORY_PATH,
366 REMOVE_PATH,
367 RECURSIVE_REMOVE_PATH);
368 }
369
370 static struct Item* find_glob(OrderedHashmap *h, const char *match) {
371 ItemArray *j;
372 Iterator i;
373
374 ORDERED_HASHMAP_FOREACH(j, h, i) {
375 size_t n;
376
377 for (n = 0; n < j->n_items; n++) {
378 Item *item = j->items + n;
379
380 if (fnmatch(item->path, match, FNM_PATHNAME|FNM_PERIOD) == 0)
381 return item;
382 }
383 }
384
385 return NULL;
386 }
387
388 static int load_unix_sockets(void) {
389 _cleanup_set_free_free_ Set *sockets = NULL;
390 _cleanup_fclose_ FILE *f = NULL;
391 int r;
392
393 if (unix_sockets)
394 return 0;
395
396 /* We maintain a cache of the sockets we found in /proc/net/unix to speed things up a little. */
397
398 sockets = set_new(&path_hash_ops);
399 if (!sockets)
400 return log_oom();
401
402 f = fopen("/proc/net/unix", "re");
403 if (!f)
404 return log_full_errno(errno == ENOENT ? LOG_DEBUG : LOG_WARNING, errno,
405 "Failed to open /proc/net/unix, ignoring: %m");
406
407 /* Skip header */
408 r = read_line(f, LONG_LINE_MAX, NULL);
409 if (r < 0)
410 return log_warning_errno(r, "Failed to skip /proc/net/unix header line: %m");
411 if (r == 0)
412 return log_warning_errno(SYNTHETIC_ERRNO(EIO), "Premature end of file reading /proc/net/unix.");
413
414 for (;;) {
415 _cleanup_free_ char *line = NULL, *s = NULL;
416 char *p;
417
418 r = read_line(f, LONG_LINE_MAX, &line);
419 if (r < 0)
420 return log_warning_errno(r, "Failed to read /proc/net/unix line, ignoring: %m");
421 if (r == 0) /* EOF */
422 break;
423
424 p = strchr(line, ':');
425 if (!p)
426 continue;
427
428 if (strlen(p) < 37)
429 continue;
430
431 p += 37;
432 p += strspn(p, WHITESPACE);
433 p += strcspn(p, WHITESPACE); /* skip one more word */
434 p += strspn(p, WHITESPACE);
435
436 if (*p != '/')
437 continue;
438
439 s = strdup(p);
440 if (!s)
441 return log_oom();
442
443 path_simplify(s, false);
444
445 r = set_consume(sockets, s);
446 if (r == -EEXIST)
447 continue;
448 if (r < 0)
449 return log_warning_errno(r, "Failed to add AF_UNIX socket to set, ignoring: %m");
450
451 TAKE_PTR(s);
452 }
453
454 unix_sockets = TAKE_PTR(sockets);
455 return 1;
456 }
457
458 static bool unix_socket_alive(const char *fn) {
459 assert(fn);
460
461 if (load_unix_sockets() < 0)
462 return true; /* We don't know, so assume yes */
463
464 return !!set_get(unix_sockets, (char*) fn);
465 }
466
467 static DIR* xopendirat_nomod(int dirfd, const char *path) {
468 DIR *dir;
469
470 dir = xopendirat(dirfd, path, O_NOFOLLOW|O_NOATIME);
471 if (dir)
472 return dir;
473
474 log_debug_errno(errno, "Cannot open %sdirectory \"%s\": %m", dirfd == AT_FDCWD ? "" : "sub", path);
475 if (errno != EPERM)
476 return NULL;
477
478 dir = xopendirat(dirfd, path, O_NOFOLLOW);
479 if (!dir)
480 log_debug_errno(errno, "Cannot open %sdirectory \"%s\": %m", dirfd == AT_FDCWD ? "" : "sub", path);
481
482 return dir;
483 }
484
485 static DIR* opendir_nomod(const char *path) {
486 return xopendirat_nomod(AT_FDCWD, path);
487 }
488
489 static int dir_cleanup(
490 Item *i,
491 const char *p,
492 DIR *d,
493 const struct stat *ds,
494 usec_t cutoff,
495 dev_t rootdev,
496 bool mountpoint,
497 int maxdepth,
498 bool keep_this_level) {
499
500 struct dirent *dent;
501 bool deleted = false;
502 int r = 0;
503
504 FOREACH_DIRENT_ALL(dent, d, break) {
505 struct stat s;
506 usec_t age;
507 _cleanup_free_ char *sub_path = NULL;
508
509 if (dot_or_dot_dot(dent->d_name))
510 continue;
511
512 if (fstatat(dirfd(d), dent->d_name, &s, AT_SYMLINK_NOFOLLOW) < 0) {
513 if (errno == ENOENT)
514 continue;
515
516 /* FUSE, NFS mounts, SELinux might return EACCES */
517 r = log_full_errno(errno == EACCES ? LOG_DEBUG : LOG_ERR, errno,
518 "stat(%s/%s) failed: %m", p, dent->d_name);
519 continue;
520 }
521
522 /* Stay on the same filesystem */
523 if (s.st_dev != rootdev) {
524 log_debug("Ignoring \"%s/%s\": different filesystem.", p, dent->d_name);
525 continue;
526 }
527
528 /* Try to detect bind mounts of the same filesystem instance; they
529 * do not differ in device major/minors. This type of query is not
530 * supported on all kernels or filesystem types though. */
531 if (S_ISDIR(s.st_mode)) {
532 int q;
533
534 q = fd_is_mount_point(dirfd(d), dent->d_name, 0);
535 if (q < 0)
536 log_debug_errno(q, "Failed to determine whether \"%s/%s\" is a mount point, ignoring: %m", p, dent->d_name);
537 else if (q > 0) {
538 log_debug("Ignoring \"%s/%s\": different mount of the same filesystem.", p, dent->d_name);
539 continue;
540 }
541 }
542
543 sub_path = path_join(p, dent->d_name);
544 if (!sub_path) {
545 r = log_oom();
546 goto finish;
547 }
548
549 /* Is there an item configured for this path? */
550 if (ordered_hashmap_get(items, sub_path)) {
551 log_debug("Ignoring \"%s\": a separate entry exists.", sub_path);
552 continue;
553 }
554
555 if (find_glob(globs, sub_path)) {
556 log_debug("Ignoring \"%s\": a separate glob exists.", sub_path);
557 continue;
558 }
559
560 if (S_ISDIR(s.st_mode)) {
561 _cleanup_closedir_ DIR *sub_dir = NULL;
562
563 if (mountpoint &&
564 streq(dent->d_name, "lost+found") &&
565 s.st_uid == 0) {
566 log_debug("Ignoring directory \"%s\".", sub_path);
567 continue;
568 }
569
570 if (maxdepth <= 0)
571 log_warning("Reached max depth on \"%s\".", sub_path);
572 else {
573 int q;
574
575 sub_dir = xopendirat_nomod(dirfd(d), dent->d_name);
576 if (!sub_dir) {
577 if (errno != ENOENT)
578 r = log_warning_errno(errno, "Opening directory \"%s\" failed, ignoring: %m", sub_path);
579
580 continue;
581 }
582
583 if (flock(dirfd(sub_dir), LOCK_EX|LOCK_NB) < 0) {
584 log_debug_errno(errno, "Couldn't acquire shared BSD lock on directory \"%s\", skipping: %m", p);
585 continue;
586 }
587
588 q = dir_cleanup(i, sub_path, sub_dir, &s, cutoff, rootdev, false, maxdepth-1, false);
589 if (q < 0)
590 r = q;
591 }
592
593 /* Note: if you are wondering why we don't support the sticky bit for excluding
594 * directories from cleaning like we do it for other file system objects: well, the
595 * sticky bit already has a meaning for directories, so we don't want to overload
596 * that. */
597
598 if (keep_this_level) {
599 log_debug("Keeping directory \"%s\".", sub_path);
600 continue;
601 }
602
603 /* Ignore ctime, we change it when deleting */
604 age = timespec_load(&s.st_mtim);
605 if (age >= cutoff) {
606 char a[FORMAT_TIMESTAMP_MAX];
607 /* Follows spelling in stat(1). */
608 log_debug("Directory \"%s\": modify time %s is too new.",
609 sub_path,
610 format_timestamp_us(a, sizeof(a), age));
611 continue;
612 }
613
614 age = timespec_load(&s.st_atim);
615 if (age >= cutoff) {
616 char a[FORMAT_TIMESTAMP_MAX];
617 log_debug("Directory \"%s\": access time %s is too new.",
618 sub_path,
619 format_timestamp_us(a, sizeof(a), age));
620 continue;
621 }
622
623 log_debug("Removing directory \"%s\".", sub_path);
624 if (unlinkat(dirfd(d), dent->d_name, AT_REMOVEDIR) < 0)
625 if (!IN_SET(errno, ENOENT, ENOTEMPTY))
626 r = log_warning_errno(errno, "Failed to remove directory \"%s\", ignoring: %m", sub_path);
627
628 } else {
629 /* Skip files for which the sticky bit is set. These are semantics we define, and are
630 * unknown elsewhere. See XDG_RUNTIME_DIR specification for details. */
631 if (s.st_mode & S_ISVTX) {
632 log_debug("Skipping \"%s\": sticky bit set.", sub_path);
633 continue;
634 }
635
636 if (mountpoint &&
637 S_ISREG(s.st_mode) &&
638 s.st_uid == 0 &&
639 STR_IN_SET(dent->d_name,
640 ".journal",
641 "aquota.user",
642 "aquota.group")) {
643 log_debug("Skipping \"%s\".", sub_path);
644 continue;
645 }
646
647 /* Ignore sockets that are listed in /proc/net/unix */
648 if (S_ISSOCK(s.st_mode) && unix_socket_alive(sub_path)) {
649 log_debug("Skipping \"%s\": live socket.", sub_path);
650 continue;
651 }
652
653 /* Ignore device nodes */
654 if (S_ISCHR(s.st_mode) || S_ISBLK(s.st_mode)) {
655 log_debug("Skipping \"%s\": a device.", sub_path);
656 continue;
657 }
658
659 /* Keep files on this level around if this is requested */
660 if (keep_this_level) {
661 log_debug("Keeping \"%s\".", sub_path);
662 continue;
663 }
664
665 age = timespec_load(&s.st_mtim);
666 if (age >= cutoff) {
667 char a[FORMAT_TIMESTAMP_MAX];
668 /* Follows spelling in stat(1). */
669 log_debug("File \"%s\": modify time %s is too new.",
670 sub_path,
671 format_timestamp_us(a, sizeof(a), age));
672 continue;
673 }
674
675 age = timespec_load(&s.st_atim);
676 if (age >= cutoff) {
677 char a[FORMAT_TIMESTAMP_MAX];
678 log_debug("File \"%s\": access time %s is too new.",
679 sub_path,
680 format_timestamp_us(a, sizeof(a), age));
681 continue;
682 }
683
684 age = timespec_load(&s.st_ctim);
685 if (age >= cutoff) {
686 char a[FORMAT_TIMESTAMP_MAX];
687 log_debug("File \"%s\": change time %s is too new.",
688 sub_path,
689 format_timestamp_us(a, sizeof(a), age));
690 continue;
691 }
692
693 log_debug("Removing \"%s\".", sub_path);
694 if (unlinkat(dirfd(d), dent->d_name, 0) < 0)
695 if (errno != ENOENT)
696 r = log_warning_errno(errno, "Failed to remove \"%s\", ignoring: %m", sub_path);
697
698 deleted = true;
699 }
700 }
701
702 finish:
703 if (deleted) {
704 char a[FORMAT_TIMESTAMP_MAX], b[FORMAT_TIMESTAMP_MAX];
705 usec_t age1, age2;
706
707 age1 = timespec_load(&ds->st_atim);
708 age2 = timespec_load(&ds->st_mtim);
709
710 log_debug("Restoring access and modification time on \"%s\": %s, %s",
711 p,
712 format_timestamp_us(a, sizeof(a), age1),
713 format_timestamp_us(b, sizeof(b), age2));
714
715 /* Restore original directory timestamps */
716 if (futimens(dirfd(d), (struct timespec[]) {
717 ds->st_atim,
718 ds->st_mtim }) < 0)
719 log_warning_errno(errno, "Failed to revert timestamps of '%s', ignoring: %m", p);
720 }
721
722 return r;
723 }
724
725 static bool dangerous_hardlinks(void) {
726 _cleanup_free_ char *value = NULL;
727 static int cached = -1;
728 int r;
729
730 /* Check whether the fs.protected_hardlinks sysctl is on. If we can't determine it we assume its off, as that's
731 * what the upstream default is. */
732
733 if (cached >= 0)
734 return cached;
735
736 r = read_one_line_file("/proc/sys/fs/protected_hardlinks", &value);
737 if (r < 0) {
738 log_debug_errno(r, "Failed to read fs.protected_hardlinks sysctl: %m");
739 return true;
740 }
741
742 r = parse_boolean(value);
743 if (r < 0) {
744 log_debug_errno(r, "Failed to parse fs.protected_hardlinks sysctl: %m");
745 return true;
746 }
747
748 cached = r == 0;
749 return cached;
750 }
751
752 static bool hardlink_vulnerable(const struct stat *st) {
753 assert(st);
754
755 return !S_ISDIR(st->st_mode) && st->st_nlink > 1 && dangerous_hardlinks();
756 }
757
758 static mode_t process_mask_perms(mode_t mode, mode_t current) {
759
760 if ((current & 0111) == 0)
761 mode &= ~0111;
762 if ((current & 0222) == 0)
763 mode &= ~0222;
764 if ((current & 0444) == 0)
765 mode &= ~0444;
766 if (!S_ISDIR(current))
767 mode &= ~07000; /* remove sticky/sgid/suid bit, unless directory */
768
769 return mode;
770 }
771
772 static int fd_set_perms(Item *i, int fd, const char *path, const struct stat *st) {
773 struct stat stbuf;
774 mode_t new_mode;
775 bool do_chown;
776
777 assert(i);
778 assert(fd);
779 assert(path);
780
781 if (!i->mode_set && !i->uid_set && !i->gid_set)
782 goto shortcut;
783
784 if (!st) {
785 if (fstat(fd, &stbuf) < 0)
786 return log_error_errno(errno, "fstat(%s) failed: %m", path);
787 st = &stbuf;
788 }
789
790 if (hardlink_vulnerable(st))
791 return log_error_errno(SYNTHETIC_ERRNO(EPERM),
792 "Refusing to set permissions on hardlinked file %s while the fs.protected_hardlinks sysctl is turned off.",
793 path);
794
795 /* Do we need a chown()? */
796 do_chown =
797 (i->uid_set && i->uid != st->st_uid) ||
798 (i->gid_set && i->gid != st->st_gid);
799
800 /* Calculate the mode to apply */
801 new_mode = i->mode_set ? (i->mask_perms ?
802 process_mask_perms(i->mode, st->st_mode) :
803 i->mode) :
804 (st->st_mode & 07777);
805
806 if (i->mode_set && do_chown) {
807 /* Before we issue the chmod() let's reduce the access mode to the common bits of the old and
808 * the new mode. That way there's no time window where the file exists under the old owner
809 * with more than the old access modes — and not under the new owner with more than the new
810 * access modes either. */
811
812 if (S_ISLNK(st->st_mode))
813 log_debug("Skipping temporary mode fix for symlink %s.", path);
814 else {
815 mode_t m = new_mode & st->st_mode; /* Mask new mode by old mode */
816
817 if (((m ^ st->st_mode) & 07777) == 0)
818 log_debug("\"%s\" matches temporary mode %o already.", path, m);
819 else {
820 log_debug("Temporarily 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 (do_chown) {
828 log_debug("Changing \"%s\" to owner "UID_FMT":"GID_FMT,
829 path,
830 i->uid_set ? i->uid : UID_INVALID,
831 i->gid_set ? i->gid : GID_INVALID);
832
833 if (fchownat(fd,
834 "",
835 i->uid_set ? i->uid : UID_INVALID,
836 i->gid_set ? i->gid : GID_INVALID,
837 AT_EMPTY_PATH) < 0)
838 return log_error_errno(errno, "fchownat() of %s failed: %m", path);
839 }
840
841 /* Now, apply the final mode. We do this in two cases: when the user set a mode explicitly, or after a
842 * chown(), since chown()'s mangle the access mode in regards to sgid/suid in some conditions. */
843 if (i->mode_set || do_chown) {
844 if (S_ISLNK(st->st_mode))
845 log_debug("Skipping mode fix for symlink %s.", path);
846 else {
847 /* Check if the chmod() is unnecessary. Note that if we did a chown() before we always
848 * chmod() here again, since it might have mangled the bits. */
849 if (!do_chown && ((new_mode ^ st->st_mode) & 07777) == 0)
850 log_debug("\"%s\" matches mode %o already.", path, new_mode);
851 else {
852 log_debug("Changing \"%s\" to mode %o.", path, new_mode);
853 if (fchmod_opath(fd, new_mode) < 0)
854 return log_error_errno(errno, "fchmod() of %s failed: %m", path);
855 }
856 }
857 }
858
859 shortcut:
860 return label_fix(path, 0);
861 }
862
863 static int path_open_parent_safe(const char *path) {
864 _cleanup_free_ char *dn = NULL;
865 int r, fd;
866
867 if (path_equal(path, "/") || !path_is_normalized(path))
868 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
869 "Failed to open parent of '%s': invalid path.",
870 path);
871
872 dn = dirname_malloc(path);
873 if (!dn)
874 return log_oom();
875
876 r = chase_symlinks(dn, arg_root, CHASE_SAFE|CHASE_WARN, NULL, &fd);
877 if (r < 0 && r != -ENOLINK)
878 return log_error_errno(r, "Failed to validate path %s: %m", path);
879
880 return r < 0 ? r : fd;
881 }
882
883 static int path_open_safe(const char *path) {
884 int r, fd;
885
886 /* path_open_safe() returns a file descriptor opened with O_PATH after
887 * verifying that the path doesn't contain unsafe transitions, except
888 * for its final component as the function does not follow symlink. */
889
890 assert(path);
891
892 if (!path_is_normalized(path))
893 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
894 "Failed to open invalid path '%s'.",
895 path);
896
897 r = chase_symlinks(path, arg_root, CHASE_SAFE|CHASE_WARN|CHASE_NOFOLLOW, NULL, &fd);
898 if (r < 0 && r != -ENOLINK)
899 return log_error_errno(r, "Failed to validate path %s: %m", path);
900
901 return r < 0 ? r : fd;
902 }
903
904 static int path_set_perms(Item *i, const char *path) {
905 _cleanup_close_ int fd = -1;
906
907 assert(i);
908 assert(path);
909
910 fd = path_open_safe(path);
911 if (fd < 0)
912 return fd;
913
914 return fd_set_perms(i, fd, path, NULL);
915 }
916
917 static int parse_xattrs_from_arg(Item *i) {
918 const char *p;
919 int r;
920
921 assert(i);
922 assert(i->argument);
923
924 p = i->argument;
925
926 for (;;) {
927 _cleanup_free_ char *name = NULL, *value = NULL, *xattr = NULL;
928
929 r = extract_first_word(&p, &xattr, NULL, EXTRACT_UNQUOTE|EXTRACT_CUNESCAPE);
930 if (r < 0)
931 log_warning_errno(r, "Failed to parse extended attribute '%s', ignoring: %m", p);
932 if (r <= 0)
933 break;
934
935 r = split_pair(xattr, "=", &name, &value);
936 if (r < 0) {
937 log_warning_errno(r, "Failed to parse extended attribute, ignoring: %s", xattr);
938 continue;
939 }
940
941 if (isempty(name) || isempty(value)) {
942 log_warning("Malformed extended attribute found, ignoring: %s", xattr);
943 continue;
944 }
945
946 if (strv_push_pair(&i->xattrs, name, value) < 0)
947 return log_oom();
948
949 name = value = NULL;
950 }
951
952 return 0;
953 }
954
955 static int fd_set_xattrs(Item *i, int fd, const char *path, const struct stat *st) {
956 char procfs_path[STRLEN("/proc/self/fd/") + DECIMAL_STR_MAX(int)];
957 char **name, **value;
958
959 assert(i);
960 assert(fd);
961 assert(path);
962
963 xsprintf(procfs_path, "/proc/self/fd/%i", fd);
964
965 STRV_FOREACH_PAIR(name, value, i->xattrs) {
966 log_debug("Setting extended attribute '%s=%s' on %s.", *name, *value, path);
967 if (setxattr(procfs_path, *name, *value, strlen(*value), 0) < 0)
968 return log_error_errno(errno, "Setting extended attribute %s=%s on %s failed: %m",
969 *name, *value, path);
970 }
971 return 0;
972 }
973
974 static int path_set_xattrs(Item *i, const char *path) {
975 _cleanup_close_ int fd = -1;
976
977 assert(i);
978 assert(path);
979
980 fd = path_open_safe(path);
981 if (fd < 0)
982 return fd;
983
984 return fd_set_xattrs(i, fd, path, NULL);
985 }
986
987 static int parse_acls_from_arg(Item *item) {
988 #if HAVE_ACL
989 int r;
990
991 assert(item);
992
993 /* If append_or_force (= modify) is set, we will not modify the acl
994 * afterwards, so the mask can be added now if necessary. */
995
996 r = parse_acl(item->argument, &item->acl_access, &item->acl_default, !item->append_or_force);
997 if (r < 0)
998 log_warning_errno(r, "Failed to parse ACL \"%s\": %m. Ignoring", item->argument);
999 #else
1000 log_warning_errno(SYNTHETIC_ERRNO(ENOSYS), "ACLs are not supported. Ignoring");
1001 #endif
1002
1003 return 0;
1004 }
1005
1006 #if HAVE_ACL
1007 static int path_set_acl(const char *path, const char *pretty, acl_type_t type, acl_t acl, bool modify) {
1008 _cleanup_(acl_free_charpp) char *t = NULL;
1009 _cleanup_(acl_freep) acl_t dup = NULL;
1010 int r;
1011
1012 /* Returns 0 for success, positive error if already warned,
1013 * negative error otherwise. */
1014
1015 if (modify) {
1016 r = acls_for_file(path, type, acl, &dup);
1017 if (r < 0)
1018 return r;
1019
1020 r = calc_acl_mask_if_needed(&dup);
1021 if (r < 0)
1022 return r;
1023 } else {
1024 dup = acl_dup(acl);
1025 if (!dup)
1026 return -errno;
1027
1028 /* the mask was already added earlier if needed */
1029 }
1030
1031 r = add_base_acls_if_needed(&dup, path);
1032 if (r < 0)
1033 return r;
1034
1035 t = acl_to_any_text(dup, NULL, ',', TEXT_ABBREVIATE);
1036 log_debug("Setting %s ACL %s on %s.",
1037 type == ACL_TYPE_ACCESS ? "access" : "default",
1038 strna(t), pretty);
1039
1040 r = acl_set_file(path, type, dup);
1041 if (r < 0)
1042 /* Return positive to indicate we already warned */
1043 return -log_error_errno(errno,
1044 "Setting %s ACL \"%s\" on %s failed: %m",
1045 type == ACL_TYPE_ACCESS ? "access" : "default",
1046 strna(t), pretty);
1047
1048 return 0;
1049 }
1050 #endif
1051
1052 static int fd_set_acls(Item *item, int fd, const char *path, const struct stat *st) {
1053 int r = 0;
1054 #if HAVE_ACL
1055 char procfs_path[STRLEN("/proc/self/fd/") + DECIMAL_STR_MAX(int)];
1056 struct stat stbuf;
1057
1058 assert(item);
1059 assert(fd);
1060 assert(path);
1061
1062 if (!st) {
1063 if (fstat(fd, &stbuf) < 0)
1064 return log_error_errno(errno, "fstat(%s) failed: %m", path);
1065 st = &stbuf;
1066 }
1067
1068 if (hardlink_vulnerable(st))
1069 return log_error_errno(SYNTHETIC_ERRNO(EPERM),
1070 "Refusing to set ACLs on hardlinked file %s while the fs.protected_hardlinks sysctl is turned off.",
1071 path);
1072
1073 if (S_ISLNK(st->st_mode)) {
1074 log_debug("Skipping ACL fix for symlink %s.", path);
1075 return 0;
1076 }
1077
1078 xsprintf(procfs_path, "/proc/self/fd/%i", fd);
1079
1080 if (item->acl_access)
1081 r = path_set_acl(procfs_path, path, ACL_TYPE_ACCESS, item->acl_access, item->append_or_force);
1082
1083 /* set only default acls to folders */
1084 if (r == 0 && item->acl_default && S_ISDIR(st->st_mode))
1085 r = path_set_acl(procfs_path, path, ACL_TYPE_DEFAULT, item->acl_default, item->append_or_force);
1086
1087 if (r > 0)
1088 return -r; /* already warned */
1089
1090 /* The above procfs paths don't work if /proc is not mounted. */
1091 if (r == -ENOENT && proc_mounted() == 0)
1092 r = -ENOSYS;
1093
1094 if (r == -EOPNOTSUPP) {
1095 log_debug_errno(r, "ACLs not supported by file system at %s", path);
1096 return 0;
1097 }
1098 if (r < 0)
1099 return log_error_errno(r, "ACL operation on \"%s\" failed: %m", path);
1100 #endif
1101 return r;
1102 }
1103
1104 static int path_set_acls(Item *item, const char *path) {
1105 int r = 0;
1106 #if HAVE_ACL
1107 _cleanup_close_ int fd = -1;
1108
1109 assert(item);
1110 assert(path);
1111
1112 fd = path_open_safe(path);
1113 if (fd < 0)
1114 return fd;
1115
1116 r = fd_set_acls(item, fd, path, NULL);
1117 #endif
1118 return r;
1119 }
1120
1121 static int parse_attribute_from_arg(Item *item) {
1122
1123 static const struct {
1124 char character;
1125 unsigned value;
1126 } attributes[] = {
1127 { 'A', FS_NOATIME_FL }, /* do not update atime */
1128 { 'S', FS_SYNC_FL }, /* Synchronous updates */
1129 { 'D', FS_DIRSYNC_FL }, /* dirsync behaviour (directories only) */
1130 { 'a', FS_APPEND_FL }, /* writes to file may only append */
1131 { 'c', FS_COMPR_FL }, /* Compress file */
1132 { 'd', FS_NODUMP_FL }, /* do not dump file */
1133 { 'e', FS_EXTENT_FL }, /* Extents */
1134 { 'i', FS_IMMUTABLE_FL }, /* Immutable file */
1135 { 'j', FS_JOURNAL_DATA_FL }, /* Reserved for ext3 */
1136 { 's', FS_SECRM_FL }, /* Secure deletion */
1137 { 'u', FS_UNRM_FL }, /* Undelete */
1138 { 't', FS_NOTAIL_FL }, /* file tail should not be merged */
1139 { 'T', FS_TOPDIR_FL }, /* Top of directory hierarchies */
1140 { 'C', FS_NOCOW_FL }, /* Do not cow file */
1141 { 'P', FS_PROJINHERIT_FL }, /* Inherit the quota project ID */
1142 };
1143
1144 enum {
1145 MODE_ADD,
1146 MODE_DEL,
1147 MODE_SET
1148 } mode = MODE_ADD;
1149
1150 unsigned value = 0, mask = 0;
1151 const char *p;
1152
1153 assert(item);
1154
1155 p = item->argument;
1156 if (p) {
1157 if (*p == '+') {
1158 mode = MODE_ADD;
1159 p++;
1160 } else if (*p == '-') {
1161 mode = MODE_DEL;
1162 p++;
1163 } else if (*p == '=') {
1164 mode = MODE_SET;
1165 p++;
1166 }
1167 }
1168
1169 if (isempty(p) && mode != MODE_SET)
1170 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
1171 "Setting file attribute on '%s' needs an attribute specification.",
1172 item->path);
1173
1174 for (; p && *p ; p++) {
1175 unsigned i, v;
1176
1177 for (i = 0; i < ELEMENTSOF(attributes); i++)
1178 if (*p == attributes[i].character)
1179 break;
1180
1181 if (i >= ELEMENTSOF(attributes))
1182 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
1183 "Unknown file attribute '%c' on '%s'.",
1184 *p, item->path);
1185
1186 v = attributes[i].value;
1187
1188 SET_FLAG(value, v, IN_SET(mode, MODE_ADD, MODE_SET));
1189
1190 mask |= v;
1191 }
1192
1193 if (mode == MODE_SET)
1194 mask |= CHATTR_ALL_FL;
1195
1196 assert(mask != 0);
1197
1198 item->attribute_mask = mask;
1199 item->attribute_value = value;
1200 item->attribute_set = true;
1201
1202 return 0;
1203 }
1204
1205 static int fd_set_attribute(Item *item, int fd, const char *path, const struct stat *st) {
1206 _cleanup_close_ int procfs_fd = -1;
1207 struct stat stbuf;
1208 unsigned f;
1209 int r;
1210
1211 assert(item);
1212 assert(fd);
1213 assert(path);
1214
1215 if (!item->attribute_set || item->attribute_mask == 0)
1216 return 0;
1217
1218 if (!st) {
1219 if (fstat(fd, &stbuf) < 0)
1220 return log_error_errno(errno, "fstat(%s) failed: %m", path);
1221 st = &stbuf;
1222 }
1223
1224 /* Issuing the file attribute ioctls on device nodes is not
1225 * safe, as that will be delivered to the drivers, not the
1226 * file system containing the device node. */
1227 if (!S_ISREG(st->st_mode) && !S_ISDIR(st->st_mode))
1228 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
1229 "Setting file flags is only supported on regular files and directories, cannot set on '%s'.",
1230 path);
1231
1232 f = item->attribute_value & item->attribute_mask;
1233
1234 /* Mask away directory-specific flags */
1235 if (!S_ISDIR(st->st_mode))
1236 f &= ~FS_DIRSYNC_FL;
1237
1238 procfs_fd = fd_reopen(fd, O_RDONLY|O_CLOEXEC|O_NOATIME);
1239 if (procfs_fd < 0)
1240 return log_error_errno(procfs_fd, "Failed to re-open '%s': %m", path);
1241
1242 r = chattr_fd(procfs_fd, f, item->attribute_mask, NULL);
1243 if (r < 0)
1244 log_full_errno(IN_SET(r, -ENOTTY, -EOPNOTSUPP) ? LOG_DEBUG : LOG_WARNING,
1245 r,
1246 "Cannot set file attribute for '%s', value=0x%08x, mask=0x%08x, ignoring: %m",
1247 path, item->attribute_value, item->attribute_mask);
1248
1249 return 0;
1250 }
1251
1252 static int path_set_attribute(Item *item, const char *path) {
1253 _cleanup_close_ int fd = -1;
1254
1255 if (!item->attribute_set || item->attribute_mask == 0)
1256 return 0;
1257
1258 fd = path_open_safe(path);
1259 if (fd < 0)
1260 return fd;
1261
1262 return fd_set_attribute(item, fd, path, NULL);
1263 }
1264
1265 static int write_one_file(Item *i, const char *path) {
1266 _cleanup_close_ int fd = -1, dir_fd = -1;
1267 char *bn;
1268 int flags, r;
1269
1270 assert(i);
1271 assert(path);
1272 assert(i->argument);
1273 assert(i->type == WRITE_FILE);
1274
1275 /* Validate the path and keep the fd on the directory for opening the
1276 * file so we're sure that it can't be changed behind our back. */
1277 dir_fd = path_open_parent_safe(path);
1278 if (dir_fd < 0)
1279 return dir_fd;
1280
1281 bn = basename(path);
1282
1283 flags = O_NONBLOCK|O_CLOEXEC|O_WRONLY|O_NOCTTY;
1284
1285 /* Follows symlinks */
1286 fd = openat(dir_fd, bn, i->append_or_force ? flags|O_APPEND : flags, i->mode);
1287 if (fd < 0) {
1288 if (errno == ENOENT) {
1289 log_debug_errno(errno, "Not writing missing file \"%s\": %m", path);
1290 return 0;
1291 }
1292 return log_error_errno(errno, "Failed to open file \"%s\": %m", path);
1293 }
1294
1295 /* 'w' is allowed to write into any kind of files. */
1296 log_debug("Writing to \"%s\".", path);
1297
1298 r = loop_write(fd, i->argument, strlen(i->argument), false);
1299 if (r < 0)
1300 return log_error_errno(r, "Failed to write file \"%s\": %m", path);
1301
1302 return fd_set_perms(i, fd, path, NULL);
1303 }
1304
1305 static int create_file(Item *i, const char *path) {
1306 _cleanup_close_ int fd = -1, dir_fd = -1;
1307 struct stat stbuf, *st = NULL;
1308 int r = 0;
1309 char *bn;
1310
1311 assert(i);
1312 assert(path);
1313 assert(i->type == CREATE_FILE);
1314
1315 /* 'f' operates on regular files exclusively. */
1316
1317 /* Validate the path and keep the fd on the directory for opening the
1318 * file so we're sure that it can't be changed behind our back. */
1319 dir_fd = path_open_parent_safe(path);
1320 if (dir_fd < 0)
1321 return dir_fd;
1322
1323 bn = basename(path);
1324
1325 RUN_WITH_UMASK(0000) {
1326 mac_selinux_create_file_prepare(path, S_IFREG);
1327 fd = openat(dir_fd, bn, O_CREAT|O_EXCL|O_NOFOLLOW|O_NONBLOCK|O_CLOEXEC|O_WRONLY|O_NOCTTY, i->mode);
1328 mac_selinux_create_file_clear();
1329 }
1330
1331 if (fd < 0) {
1332 /* Even on a read-only filesystem, open(2) returns EEXIST if the
1333 * file already exists. It returns EROFS only if it needs to
1334 * create the file. */
1335 if (errno != EEXIST)
1336 return log_error_errno(errno, "Failed to create file %s: %m", path);
1337
1338 /* Re-open the file. At that point it must exist since open(2)
1339 * failed with EEXIST. We still need to check if the perms/mode
1340 * need to be changed. For read-only filesystems, we let
1341 * fd_set_perms() report the error if the perms need to be
1342 * modified. */
1343 fd = openat(dir_fd, bn, O_NOFOLLOW|O_CLOEXEC|O_PATH, i->mode);
1344 if (fd < 0)
1345 return log_error_errno(errno, "Failed to re-open file %s: %m", path);
1346
1347 if (fstat(fd, &stbuf) < 0)
1348 return log_error_errno(errno, "stat(%s) failed: %m", path);
1349
1350 if (!S_ISREG(stbuf.st_mode)) {
1351 log_error("%s exists and is not a regular file.", path);
1352 return -EEXIST;
1353 }
1354
1355 st = &stbuf;
1356 } else {
1357
1358 log_debug("\"%s\" has been created.", path);
1359
1360 if (i->argument) {
1361 log_debug("Writing to \"%s\".", path);
1362
1363 r = loop_write(fd, i->argument, strlen(i->argument), false);
1364 if (r < 0)
1365 return log_error_errno(r, "Failed to write file \"%s\": %m", path);
1366 }
1367 }
1368
1369 return fd_set_perms(i, fd, path, st);
1370 }
1371
1372 static int truncate_file(Item *i, const char *path) {
1373 _cleanup_close_ int fd = -1, dir_fd = -1;
1374 struct stat stbuf, *st = NULL;
1375 bool erofs = false;
1376 int r = 0;
1377 char *bn;
1378
1379 assert(i);
1380 assert(path);
1381 assert(i->type == TRUNCATE_FILE || (i->type == CREATE_FILE && i->append_or_force));
1382
1383 /* We want to operate on regular file exclusively especially since
1384 * O_TRUNC is unspecified if the file is neither a regular file nor a
1385 * fifo nor a terminal device. Therefore we first open the file and make
1386 * sure it's a regular one before truncating it. */
1387
1388 /* Validate the path and keep the fd on the directory for opening the
1389 * file so we're sure that it can't be changed behind our back. */
1390 dir_fd = path_open_parent_safe(path);
1391 if (dir_fd < 0)
1392 return dir_fd;
1393
1394 bn = basename(path);
1395
1396 RUN_WITH_UMASK(0000) {
1397 mac_selinux_create_file_prepare(path, S_IFREG);
1398 fd = openat(dir_fd, bn, O_CREAT|O_NOFOLLOW|O_NONBLOCK|O_CLOEXEC|O_WRONLY|O_NOCTTY, i->mode);
1399 mac_selinux_create_file_clear();
1400 }
1401
1402 if (fd < 0) {
1403 if (errno != EROFS)
1404 return log_error_errno(errno, "Failed to open/create file %s: %m", path);
1405
1406 /* On a read-only filesystem, we don't want to fail if the
1407 * target is already empty and the perms are set. So we still
1408 * proceed with the sanity checks and let the remaining
1409 * operations fail with EROFS if they try to modify the target
1410 * file. */
1411
1412 fd = openat(dir_fd, bn, O_NOFOLLOW|O_CLOEXEC|O_PATH, i->mode);
1413 if (fd < 0) {
1414 if (errno == ENOENT) {
1415 log_error("Cannot create file %s on a read-only file system.", path);
1416 return -EROFS;
1417 }
1418
1419 return log_error_errno(errno, "Failed to re-open file %s: %m", path);
1420 }
1421
1422 erofs = true;
1423 }
1424
1425 if (fstat(fd, &stbuf) < 0)
1426 return log_error_errno(errno, "stat(%s) failed: %m", path);
1427
1428 if (!S_ISREG(stbuf.st_mode)) {
1429 log_error("%s exists and is not a regular file.", path);
1430 return -EEXIST;
1431 }
1432
1433 if (stbuf.st_size > 0) {
1434 if (ftruncate(fd, 0) < 0) {
1435 r = erofs ? -EROFS : -errno;
1436 return log_error_errno(r, "Failed to truncate file %s: %m", path);
1437 }
1438 } else
1439 st = &stbuf;
1440
1441 log_debug("\"%s\" has been created.", path);
1442
1443 if (i->argument) {
1444 log_debug("Writing to \"%s\".", path);
1445
1446 r = loop_write(fd, i->argument, strlen(i->argument), false);
1447 if (r < 0) {
1448 r = erofs ? -EROFS : r;
1449 return log_error_errno(r, "Failed to write file %s: %m", path);
1450 }
1451 }
1452
1453 return fd_set_perms(i, fd, path, st);
1454 }
1455
1456 static int copy_files(Item *i) {
1457 _cleanup_close_ int dfd = -1, fd = -1;
1458 char *bn;
1459 int r;
1460
1461 log_debug("Copying tree \"%s\" to \"%s\".", i->argument, i->path);
1462
1463 bn = basename(i->path);
1464
1465 /* Validate the path and use the returned directory fd for copying the
1466 * target so we're sure that the path can't be changed behind our
1467 * back. */
1468 dfd = path_open_parent_safe(i->path);
1469 if (dfd < 0)
1470 return dfd;
1471
1472 r = copy_tree_at(AT_FDCWD, i->argument,
1473 dfd, bn,
1474 i->uid_set ? i->uid : UID_INVALID,
1475 i->gid_set ? i->gid : GID_INVALID,
1476 COPY_REFLINK | COPY_MERGE_EMPTY | COPY_MAC_CREATE);
1477 if (r < 0) {
1478 struct stat a, b;
1479
1480 /* If the target already exists on read-only filesystems, trying
1481 * to create the target will not fail with EEXIST but with
1482 * EROFS. */
1483 if (r == -EROFS && faccessat(dfd, bn, F_OK, AT_SYMLINK_NOFOLLOW) == 0)
1484 r = -EEXIST;
1485
1486 if (r != -EEXIST)
1487 return log_error_errno(r, "Failed to copy files to %s: %m", i->path);
1488
1489 if (stat(i->argument, &a) < 0)
1490 return log_error_errno(errno, "stat(%s) failed: %m", i->argument);
1491
1492 if (fstatat(dfd, bn, &b, AT_SYMLINK_NOFOLLOW) < 0)
1493 return log_error_errno(errno, "stat(%s) failed: %m", i->path);
1494
1495 if ((a.st_mode ^ b.st_mode) & S_IFMT) {
1496 log_debug("Can't copy to %s, file exists already and is of different type", i->path);
1497 return 0;
1498 }
1499 }
1500
1501 fd = openat(dfd, bn, O_NOFOLLOW|O_CLOEXEC|O_PATH);
1502 if (fd < 0)
1503 return log_error_errno(errno, "Failed to openat(%s): %m", i->path);
1504
1505 return fd_set_perms(i, fd, i->path, NULL);
1506 }
1507
1508 typedef enum {
1509 CREATION_NORMAL,
1510 CREATION_EXISTING,
1511 CREATION_FORCE,
1512 _CREATION_MODE_MAX,
1513 _CREATION_MODE_INVALID = -1
1514 } CreationMode;
1515
1516 static const char *const creation_mode_verb_table[_CREATION_MODE_MAX] = {
1517 [CREATION_NORMAL] = "Created",
1518 [CREATION_EXISTING] = "Found existing",
1519 [CREATION_FORCE] = "Created replacement",
1520 };
1521
1522 DEFINE_PRIVATE_STRING_TABLE_LOOKUP_TO_STRING(creation_mode_verb, CreationMode);
1523
1524 static int create_directory_or_subvolume(const char *path, mode_t mode, bool subvol, CreationMode *creation) {
1525 _cleanup_close_ int pfd = -1;
1526 CreationMode c;
1527 int r;
1528
1529 assert(path);
1530
1531 if (!creation)
1532 creation = &c;
1533
1534 pfd = path_open_parent_safe(path);
1535 if (pfd < 0)
1536 return pfd;
1537
1538 if (subvol) {
1539 if (btrfs_is_subvol(empty_to_root(arg_root)) <= 0)
1540
1541 /* Don't create a subvolume unless the root directory is
1542 * one, too. We do this under the assumption that if the
1543 * root directory is just a plain directory (i.e. very
1544 * light-weight), we shouldn't try to split it up into
1545 * subvolumes (i.e. more heavy-weight). Thus, chroot()
1546 * environments and suchlike will get a full brtfs
1547 * subvolume set up below their tree only if they
1548 * specifically set up a btrfs subvolume for the root
1549 * dir too. */
1550
1551 subvol = false;
1552 else {
1553 RUN_WITH_UMASK((~mode) & 0777)
1554 r = btrfs_subvol_make_fd(pfd, basename(path));
1555 }
1556 } else
1557 r = 0;
1558
1559 if (!subvol || r == -ENOTTY)
1560 RUN_WITH_UMASK(0000)
1561 r = mkdirat_label(pfd, basename(path), mode);
1562
1563 if (r < 0) {
1564 int k;
1565
1566 if (!IN_SET(r, -EEXIST, -EROFS))
1567 return log_error_errno(r, "Failed to create directory or subvolume \"%s\": %m", path);
1568
1569 k = is_dir_fd(pfd);
1570 if (k == -ENOENT && r == -EROFS)
1571 return log_error_errno(r, "%s does not exist and cannot be created as the file system is read-only.", path);
1572 if (k < 0)
1573 return log_error_errno(k, "Failed to check if %s exists: %m", path);
1574 if (!k) {
1575 log_warning("\"%s\" already exists and is not a directory.", path);
1576 return -EEXIST;
1577 }
1578
1579 *creation = CREATION_EXISTING;
1580 } else
1581 *creation = CREATION_NORMAL;
1582
1583 log_debug("%s directory \"%s\".", creation_mode_verb_to_string(*creation), path);
1584
1585 r = openat(pfd, basename(path), O_NOCTTY|O_CLOEXEC|O_DIRECTORY);
1586 if (r < 0)
1587 return log_error_errno(errno, "Failed to open directory '%s': %m", basename(path));
1588
1589 return r;
1590 }
1591
1592 static int create_directory(Item *i, const char *path) {
1593 _cleanup_close_ int fd = -1;
1594
1595 assert(i);
1596 assert(IN_SET(i->type, CREATE_DIRECTORY, TRUNCATE_DIRECTORY));
1597
1598 fd = create_directory_or_subvolume(path, i->mode, false, NULL);
1599 if (fd == -EEXIST)
1600 return 0;
1601 if (fd < 0)
1602 return fd;
1603
1604 return fd_set_perms(i, fd, path, NULL);
1605 }
1606
1607 static int create_subvolume(Item *i, const char *path) {
1608 _cleanup_close_ int fd = -1;
1609 CreationMode creation;
1610 int r, q = 0;
1611
1612 assert(i);
1613 assert(IN_SET(i->type, CREATE_SUBVOLUME, CREATE_SUBVOLUME_NEW_QUOTA, CREATE_SUBVOLUME_INHERIT_QUOTA));
1614
1615 fd = create_directory_or_subvolume(path, i->mode, true, &creation);
1616 if (fd == -EEXIST)
1617 return 0;
1618 if (fd < 0)
1619 return fd;
1620
1621 if (creation == CREATION_NORMAL &&
1622 IN_SET(i->type, CREATE_SUBVOLUME_NEW_QUOTA, CREATE_SUBVOLUME_INHERIT_QUOTA)) {
1623 r = btrfs_subvol_auto_qgroup_fd(fd, 0, i->type == CREATE_SUBVOLUME_NEW_QUOTA);
1624 if (r == -ENOTTY)
1625 log_debug_errno(r, "Couldn't adjust quota for subvolume \"%s\" (unsupported fs or dir not a subvolume): %m", i->path);
1626 else if (r == -EROFS)
1627 log_debug_errno(r, "Couldn't adjust quota for subvolume \"%s\" (fs is read-only).", i->path);
1628 else if (r == -ENOPROTOOPT)
1629 log_debug_errno(r, "Couldn't adjust quota for subvolume \"%s\" (quota support is disabled).", i->path);
1630 else if (r < 0)
1631 q = log_error_errno(r, "Failed to adjust quota for subvolume \"%s\": %m", i->path);
1632 else if (r > 0)
1633 log_debug("Adjusted quota for subvolume \"%s\".", i->path);
1634 else if (r == 0)
1635 log_debug("Quota for subvolume \"%s\" already in place, no change made.", i->path);
1636 }
1637
1638 r = fd_set_perms(i, fd, path, NULL);
1639 if (q < 0) /* prefer the quota change error from above */
1640 return q;
1641
1642 return r;
1643 }
1644
1645 static int empty_directory(Item *i, const char *path) {
1646 int r;
1647
1648 assert(i);
1649 assert(i->type == EMPTY_DIRECTORY);
1650
1651 r = is_dir(path, false);
1652 if (r == -ENOENT) {
1653 /* Option "e" operates only on existing objects. Do not
1654 * print errors about non-existent files or directories */
1655 log_debug("Skipping missing directory: %s", path);
1656 return 0;
1657 }
1658 if (r < 0)
1659 return log_error_errno(r, "is_dir() failed on path %s: %m", path);
1660 if (r == 0)
1661 return log_error_errno(SYNTHETIC_ERRNO(EEXIST),
1662 "'%s' already exists and is not a directory.",
1663 path);
1664
1665 return path_set_perms(i, path);
1666 }
1667
1668 static int create_device(Item *i, mode_t file_type) {
1669 _cleanup_close_ int dfd = -1, fd = -1;
1670 CreationMode creation;
1671 char *bn;
1672 int r;
1673
1674 assert(i);
1675 assert(IN_SET(file_type, S_IFBLK, S_IFCHR));
1676
1677 bn = basename(i->path);
1678
1679 /* Validate the path and use the returned directory fd for copying the
1680 * target so we're sure that the path can't be changed behind our
1681 * back. */
1682 dfd = path_open_parent_safe(i->path);
1683 if (dfd < 0)
1684 return dfd;
1685
1686 RUN_WITH_UMASK(0000) {
1687 mac_selinux_create_file_prepare(i->path, file_type);
1688 r = mknodat(dfd, bn, i->mode | file_type, i->major_minor);
1689 mac_selinux_create_file_clear();
1690 }
1691
1692 if (r < 0) {
1693 struct stat st;
1694
1695 if (errno == EPERM) {
1696 log_debug("We lack permissions, possibly because of cgroup configuration; "
1697 "skipping creation of device node %s.", i->path);
1698 return 0;
1699 }
1700
1701 if (errno != EEXIST)
1702 return log_error_errno(errno, "Failed to create device node %s: %m", i->path);
1703
1704 if (fstatat(dfd, bn, &st, 0) < 0)
1705 return log_error_errno(errno, "stat(%s) failed: %m", i->path);
1706
1707 if ((st.st_mode & S_IFMT) != file_type) {
1708
1709 if (i->append_or_force) {
1710
1711 RUN_WITH_UMASK(0000) {
1712 mac_selinux_create_file_prepare(i->path, file_type);
1713 /* FIXME: need to introduce mknodat_atomic() */
1714 r = mknod_atomic(i->path, i->mode | file_type, i->major_minor);
1715 mac_selinux_create_file_clear();
1716 }
1717
1718 if (r < 0)
1719 return log_error_errno(r, "Failed to create device node \"%s\": %m", i->path);
1720 creation = CREATION_FORCE;
1721 } else {
1722 log_debug("%s is not a device node.", i->path);
1723 return 0;
1724 }
1725 } else
1726 creation = CREATION_EXISTING;
1727 } else
1728 creation = CREATION_NORMAL;
1729
1730 log_debug("%s %s device node \"%s\" %u:%u.",
1731 creation_mode_verb_to_string(creation),
1732 i->type == CREATE_BLOCK_DEVICE ? "block" : "char",
1733 i->path, major(i->mode), minor(i->mode));
1734
1735 fd = openat(dfd, bn, O_NOFOLLOW|O_CLOEXEC|O_PATH);
1736 if (fd < 0)
1737 return log_error_errno(errno, "Failed to openat(%s): %m", i->path);
1738
1739 return fd_set_perms(i, fd, i->path, NULL);
1740 }
1741
1742 static int create_fifo(Item *i, const char *path) {
1743 _cleanup_close_ int pfd = -1, fd = -1;
1744 CreationMode creation;
1745 struct stat st;
1746 char *bn;
1747 int r;
1748
1749 pfd = path_open_parent_safe(path);
1750 if (pfd < 0)
1751 return pfd;
1752
1753 bn = basename(path);
1754
1755 RUN_WITH_UMASK(0000) {
1756 mac_selinux_create_file_prepare(path, S_IFIFO);
1757 r = mkfifoat(pfd, bn, i->mode);
1758 mac_selinux_create_file_clear();
1759 }
1760
1761 if (r < 0) {
1762 if (errno != EEXIST)
1763 return log_error_errno(errno, "Failed to create fifo %s: %m", path);
1764
1765 if (fstatat(pfd, bn, &st, AT_SYMLINK_NOFOLLOW) < 0)
1766 return log_error_errno(errno, "stat(%s) failed: %m", path);
1767
1768 if (!S_ISFIFO(st.st_mode)) {
1769
1770 if (i->append_or_force) {
1771 RUN_WITH_UMASK(0000) {
1772 mac_selinux_create_file_prepare(path, S_IFIFO);
1773 r = mkfifoat_atomic(pfd, bn, i->mode);
1774 mac_selinux_create_file_clear();
1775 }
1776
1777 if (r < 0)
1778 return log_error_errno(r, "Failed to create fifo %s: %m", path);
1779 creation = CREATION_FORCE;
1780 } else {
1781 log_warning("\"%s\" already exists and is not a fifo.", path);
1782 return 0;
1783 }
1784 } else
1785 creation = CREATION_EXISTING;
1786 } else
1787 creation = CREATION_NORMAL;
1788
1789 log_debug("%s fifo \"%s\".", creation_mode_verb_to_string(creation), path);
1790
1791 fd = openat(pfd, bn, O_NOFOLLOW|O_CLOEXEC|O_PATH);
1792 if (fd < 0)
1793 return log_error_errno(errno, "Failed to openat(%s): %m", path);
1794
1795 return fd_set_perms(i, fd, i->path, NULL);
1796 }
1797
1798 typedef int (*action_t)(Item *i, const char *path);
1799 typedef int (*fdaction_t)(Item *i, int fd, const char *path, const struct stat *st);
1800
1801 static int item_do(Item *i, int fd, const char *path, fdaction_t action) {
1802 struct stat st;
1803 int r = 0, q;
1804
1805 assert(i);
1806 assert(path);
1807 assert(fd >= 0);
1808
1809 if (fstat(fd, &st) < 0) {
1810 r = log_error_errno(errno, "fstat() on file failed: %m");
1811 goto finish;
1812 }
1813
1814 /* This returns the first error we run into, but nevertheless
1815 * tries to go on */
1816 r = action(i, fd, path, &st);
1817
1818 if (S_ISDIR(st.st_mode)) {
1819 char procfs_path[STRLEN("/proc/self/fd/") + DECIMAL_STR_MAX(int)];
1820 _cleanup_closedir_ DIR *d = NULL;
1821 struct dirent *de;
1822
1823 /* The passed 'fd' was opened with O_PATH. We need to convert
1824 * it into a 'regular' fd before reading the directory content. */
1825 xsprintf(procfs_path, "/proc/self/fd/%i", fd);
1826
1827 d = opendir(procfs_path);
1828 if (!d) {
1829 log_error_errno(errno, "Failed to opendir() '%s': %m", procfs_path);
1830 if (r == 0)
1831 r = -errno;
1832 goto finish;
1833 }
1834
1835 FOREACH_DIRENT_ALL(de, d, q = -errno; goto finish) {
1836 int de_fd;
1837
1838 if (dot_or_dot_dot(de->d_name))
1839 continue;
1840
1841 de_fd = openat(fd, de->d_name, O_NOFOLLOW|O_CLOEXEC|O_PATH);
1842 if (de_fd < 0)
1843 q = log_error_errno(errno, "Failed to open() file '%s': %m", de->d_name);
1844 else {
1845 _cleanup_free_ char *de_path = NULL;
1846
1847 de_path = path_join(path, de->d_name);
1848 if (!de_path)
1849 q = log_oom();
1850 else
1851 /* Pass ownership of dirent fd over */
1852 q = item_do(i, de_fd, de_path, action);
1853 }
1854
1855 if (q < 0 && r == 0)
1856 r = q;
1857 }
1858 }
1859 finish:
1860 safe_close(fd);
1861 return r;
1862 }
1863
1864 static int glob_item(Item *i, action_t action) {
1865 _cleanup_globfree_ glob_t g = {
1866 .gl_opendir = (void *(*)(const char *)) opendir_nomod,
1867 };
1868 int r = 0, k;
1869 char **fn;
1870
1871 k = safe_glob(i->path, GLOB_NOSORT|GLOB_BRACE, &g);
1872 if (k < 0 && k != -ENOENT)
1873 return log_error_errno(k, "glob(%s) failed: %m", i->path);
1874
1875 STRV_FOREACH(fn, g.gl_pathv) {
1876 k = action(i, *fn);
1877 if (k < 0 && r == 0)
1878 r = k;
1879 }
1880
1881 return r;
1882 }
1883
1884 static int glob_item_recursively(Item *i, fdaction_t action) {
1885 _cleanup_globfree_ glob_t g = {
1886 .gl_opendir = (void *(*)(const char *)) opendir_nomod,
1887 };
1888 int r = 0, k;
1889 char **fn;
1890
1891 k = safe_glob(i->path, GLOB_NOSORT|GLOB_BRACE, &g);
1892 if (k < 0 && k != -ENOENT)
1893 return log_error_errno(k, "glob(%s) failed: %m", i->path);
1894
1895 STRV_FOREACH(fn, g.gl_pathv) {
1896 _cleanup_close_ int fd = -1;
1897
1898 /* Make sure we won't trigger/follow file object (such as
1899 * device nodes, automounts, ...) pointed out by 'fn' with
1900 * O_PATH. Note, when O_PATH is used, flags other than
1901 * O_CLOEXEC, O_DIRECTORY, and O_NOFOLLOW are ignored. */
1902
1903 fd = open(*fn, O_CLOEXEC|O_NOFOLLOW|O_PATH);
1904 if (fd < 0) {
1905 log_error_errno(errno, "Opening '%s' failed: %m", *fn);
1906 if (r == 0)
1907 r = -errno;
1908 continue;
1909 }
1910
1911 k = item_do(i, fd, *fn, action);
1912 if (k < 0 && r == 0)
1913 r = k;
1914
1915 /* we passed fd ownership to the previous call */
1916 fd = -1;
1917 }
1918
1919 return r;
1920 }
1921
1922 static int create_item(Item *i) {
1923 CreationMode creation;
1924 int r = 0;
1925
1926 assert(i);
1927
1928 log_debug("Running create action for entry %c %s", (char) i->type, i->path);
1929
1930 switch (i->type) {
1931
1932 case IGNORE_PATH:
1933 case IGNORE_DIRECTORY_PATH:
1934 case REMOVE_PATH:
1935 case RECURSIVE_REMOVE_PATH:
1936 return 0;
1937
1938 case TRUNCATE_FILE:
1939 case CREATE_FILE:
1940 RUN_WITH_UMASK(0000)
1941 (void) mkdir_parents_label(i->path, 0755);
1942
1943 if ((i->type == CREATE_FILE && i->append_or_force) || i->type == TRUNCATE_FILE)
1944 r = truncate_file(i, i->path);
1945 else
1946 r = create_file(i, i->path);
1947
1948 if (r < 0)
1949 return r;
1950 break;
1951
1952 case COPY_FILES:
1953 RUN_WITH_UMASK(0000)
1954 (void) mkdir_parents_label(i->path, 0755);
1955
1956 r = copy_files(i);
1957 if (r < 0)
1958 return r;
1959 break;
1960
1961 case WRITE_FILE:
1962 r = glob_item(i, write_one_file);
1963 if (r < 0)
1964 return r;
1965
1966 break;
1967
1968 case CREATE_DIRECTORY:
1969 case TRUNCATE_DIRECTORY:
1970 RUN_WITH_UMASK(0000)
1971 (void) mkdir_parents_label(i->path, 0755);
1972
1973 r = create_directory(i, i->path);
1974 if (r < 0)
1975 return r;
1976 break;
1977
1978 case CREATE_SUBVOLUME:
1979 case CREATE_SUBVOLUME_INHERIT_QUOTA:
1980 case CREATE_SUBVOLUME_NEW_QUOTA:
1981 RUN_WITH_UMASK(0000)
1982 (void) mkdir_parents_label(i->path, 0755);
1983
1984 r = create_subvolume(i, i->path);
1985 if (r < 0)
1986 return r;
1987 break;
1988
1989 case EMPTY_DIRECTORY:
1990 r = glob_item(i, empty_directory);
1991 if (r < 0)
1992 return r;
1993 break;
1994
1995 case CREATE_FIFO:
1996 RUN_WITH_UMASK(0000)
1997 (void) mkdir_parents_label(i->path, 0755);
1998
1999 r = create_fifo(i, i->path);
2000 if (r < 0)
2001 return r;
2002 break;
2003
2004 case CREATE_SYMLINK: {
2005 RUN_WITH_UMASK(0000)
2006 (void) mkdir_parents_label(i->path, 0755);
2007
2008 mac_selinux_create_file_prepare(i->path, S_IFLNK);
2009 r = symlink(i->argument, i->path);
2010 mac_selinux_create_file_clear();
2011
2012 if (r < 0) {
2013 _cleanup_free_ char *x = NULL;
2014
2015 if (errno != EEXIST)
2016 return log_error_errno(errno, "symlink(%s, %s) failed: %m", i->argument, i->path);
2017
2018 r = readlink_malloc(i->path, &x);
2019 if (r < 0 || !streq(i->argument, x)) {
2020
2021 if (i->append_or_force) {
2022 mac_selinux_create_file_prepare(i->path, S_IFLNK);
2023 r = symlink_atomic(i->argument, i->path);
2024 mac_selinux_create_file_clear();
2025
2026 if (IN_SET(r, -EISDIR, -EEXIST, -ENOTEMPTY)) {
2027 r = rm_rf(i->path, REMOVE_ROOT|REMOVE_PHYSICAL);
2028 if (r < 0)
2029 return log_error_errno(r, "rm -fr %s failed: %m", i->path);
2030
2031 mac_selinux_create_file_prepare(i->path, S_IFLNK);
2032 r = symlink(i->argument, i->path) < 0 ? -errno : 0;
2033 mac_selinux_create_file_clear();
2034 }
2035 if (r < 0)
2036 return log_error_errno(r, "symlink(%s, %s) failed: %m", i->argument, i->path);
2037
2038 creation = CREATION_FORCE;
2039 } else {
2040 log_debug("\"%s\" is not a symlink or does not point to the correct path.", i->path);
2041 return 0;
2042 }
2043 } else
2044 creation = CREATION_EXISTING;
2045 } else
2046
2047 creation = CREATION_NORMAL;
2048 log_debug("%s symlink \"%s\".", creation_mode_verb_to_string(creation), i->path);
2049 break;
2050 }
2051
2052 case CREATE_BLOCK_DEVICE:
2053 case CREATE_CHAR_DEVICE:
2054 if (have_effective_cap(CAP_MKNOD) == 0) {
2055 /* In a container we lack CAP_MKNOD. We shouldn't attempt to create the device node in that
2056 * case to avoid noise, and we don't support virtualized devices in containers anyway. */
2057
2058 log_debug("We lack CAP_MKNOD, skipping creation of device node %s.", i->path);
2059 return 0;
2060 }
2061
2062 RUN_WITH_UMASK(0000)
2063 (void) mkdir_parents_label(i->path, 0755);
2064
2065 r = create_device(i, i->type == CREATE_BLOCK_DEVICE ? S_IFBLK : S_IFCHR);
2066 if (r < 0)
2067 return r;
2068
2069 break;
2070
2071 case ADJUST_MODE:
2072 case RELABEL_PATH:
2073 r = glob_item(i, path_set_perms);
2074 if (r < 0)
2075 return r;
2076 break;
2077
2078 case RECURSIVE_RELABEL_PATH:
2079 r = glob_item_recursively(i, fd_set_perms);
2080 if (r < 0)
2081 return r;
2082 break;
2083
2084 case SET_XATTR:
2085 r = glob_item(i, path_set_xattrs);
2086 if (r < 0)
2087 return r;
2088 break;
2089
2090 case RECURSIVE_SET_XATTR:
2091 r = glob_item_recursively(i, fd_set_xattrs);
2092 if (r < 0)
2093 return r;
2094 break;
2095
2096 case SET_ACL:
2097 r = glob_item(i, path_set_acls);
2098 if (r < 0)
2099 return r;
2100 break;
2101
2102 case RECURSIVE_SET_ACL:
2103 r = glob_item_recursively(i, fd_set_acls);
2104 if (r < 0)
2105 return r;
2106 break;
2107
2108 case SET_ATTRIBUTE:
2109 r = glob_item(i, path_set_attribute);
2110 if (r < 0)
2111 return r;
2112 break;
2113
2114 case RECURSIVE_SET_ATTRIBUTE:
2115 r = glob_item_recursively(i, fd_set_attribute);
2116 if (r < 0)
2117 return r;
2118 break;
2119 }
2120
2121 return 0;
2122 }
2123
2124 static int remove_item_instance(Item *i, const char *instance) {
2125 int r;
2126
2127 assert(i);
2128
2129 switch (i->type) {
2130
2131 case REMOVE_PATH:
2132 if (remove(instance) < 0 && errno != ENOENT)
2133 return log_error_errno(errno, "rm(%s): %m", instance);
2134
2135 break;
2136
2137 case RECURSIVE_REMOVE_PATH:
2138 /* FIXME: we probably should use dir_cleanup() here instead of rm_rf() so that 'x' is honoured. */
2139 log_debug("rm -rf \"%s\"", instance);
2140 r = rm_rf(instance, REMOVE_ROOT|REMOVE_SUBVOLUME|REMOVE_PHYSICAL);
2141 if (r < 0 && r != -ENOENT)
2142 return log_error_errno(r, "rm_rf(%s): %m", instance);
2143
2144 break;
2145
2146 default:
2147 assert_not_reached("wut?");
2148 }
2149
2150 return 0;
2151 }
2152
2153 static int remove_item(Item *i) {
2154 int r;
2155
2156 assert(i);
2157
2158 log_debug("Running remove action for entry %c %s", (char) i->type, i->path);
2159
2160 switch (i->type) {
2161
2162 case TRUNCATE_DIRECTORY:
2163 /* FIXME: we probably should use dir_cleanup() here instead of rm_rf() so that 'x' is honoured. */
2164 log_debug("rm -rf \"%s\"", i->path);
2165 r = rm_rf(i->path, REMOVE_PHYSICAL);
2166 if (r < 0 && r != -ENOENT)
2167 return log_error_errno(r, "rm_rf(%s): %m", i->path);
2168
2169 return 0;
2170
2171 case REMOVE_PATH:
2172 case RECURSIVE_REMOVE_PATH:
2173 return glob_item(i, remove_item_instance);
2174
2175 default:
2176 return 0;
2177 }
2178 }
2179
2180 static int clean_item_instance(Item *i, const char* instance) {
2181 _cleanup_closedir_ DIR *d = NULL;
2182 struct stat s, ps;
2183 bool mountpoint;
2184 usec_t cutoff, n;
2185 char timestamp[FORMAT_TIMESTAMP_MAX];
2186
2187 assert(i);
2188
2189 if (!i->age_set)
2190 return 0;
2191
2192 n = now(CLOCK_REALTIME);
2193 if (n < i->age)
2194 return 0;
2195
2196 cutoff = n - i->age;
2197
2198 d = opendir_nomod(instance);
2199 if (!d) {
2200 if (IN_SET(errno, ENOENT, ENOTDIR)) {
2201 log_debug_errno(errno, "Directory \"%s\": %m", instance);
2202 return 0;
2203 }
2204
2205 return log_error_errno(errno, "Failed to open directory %s: %m", instance);
2206 }
2207
2208 if (fstat(dirfd(d), &s) < 0)
2209 return log_error_errno(errno, "stat(%s) failed: %m", i->path);
2210
2211 if (!S_ISDIR(s.st_mode))
2212 return log_error_errno(SYNTHETIC_ERRNO(ENOTDIR),
2213 "%s is not a directory.", i->path);
2214
2215 if (fstatat(dirfd(d), "..", &ps, AT_SYMLINK_NOFOLLOW) != 0)
2216 return log_error_errno(errno, "stat(%s/..) failed: %m", i->path);
2217
2218 mountpoint = s.st_dev != ps.st_dev || s.st_ino == ps.st_ino;
2219
2220 log_debug("Cleanup threshold for %s \"%s\" is %s",
2221 mountpoint ? "mount point" : "directory",
2222 instance,
2223 format_timestamp_us(timestamp, sizeof(timestamp), cutoff));
2224
2225 return dir_cleanup(i, instance, d, &s, cutoff, s.st_dev, mountpoint,
2226 MAX_DEPTH, i->keep_first_level);
2227 }
2228
2229 static int clean_item(Item *i) {
2230 assert(i);
2231
2232 log_debug("Running clean action for entry %c %s", (char) i->type, i->path);
2233
2234 switch (i->type) {
2235 case CREATE_DIRECTORY:
2236 case CREATE_SUBVOLUME:
2237 case CREATE_SUBVOLUME_INHERIT_QUOTA:
2238 case CREATE_SUBVOLUME_NEW_QUOTA:
2239 case TRUNCATE_DIRECTORY:
2240 case IGNORE_PATH:
2241 case COPY_FILES:
2242 clean_item_instance(i, i->path);
2243 return 0;
2244 case EMPTY_DIRECTORY:
2245 case IGNORE_DIRECTORY_PATH:
2246 return glob_item(i, clean_item_instance);
2247 default:
2248 return 0;
2249 }
2250 }
2251
2252 static int process_item(Item *i, OperationMask operation) {
2253 OperationMask todo;
2254 int r, q, p;
2255
2256 assert(i);
2257
2258 todo = operation & ~i->done;
2259 if (todo == 0) /* Everything already done? */
2260 return 0;
2261
2262 i->done |= operation;
2263
2264 r = chase_symlinks(i->path, arg_root, CHASE_NO_AUTOFS|CHASE_WARN, NULL, NULL);
2265 if (r == -EREMOTE) {
2266 log_notice_errno(r, "Skipping %s", i->path);
2267 return 0;
2268 }
2269 if (r < 0)
2270 log_debug_errno(r, "Failed to determine whether '%s' is below autofs, ignoring: %m", i->path);
2271
2272 r = FLAGS_SET(operation, OPERATION_CREATE) ? create_item(i) : 0;
2273 /* Failure can only be tolerated for create */
2274 if (i->allow_failure)
2275 r = 0;
2276
2277 q = FLAGS_SET(operation, OPERATION_REMOVE) ? remove_item(i) : 0;
2278 p = FLAGS_SET(operation, OPERATION_CLEAN) ? clean_item(i) : 0;
2279
2280 return r < 0 ? r :
2281 q < 0 ? q :
2282 p;
2283 }
2284
2285 static int process_item_array(ItemArray *array, OperationMask operation) {
2286 int r = 0;
2287 size_t n;
2288
2289 assert(array);
2290
2291 /* Create any parent first. */
2292 if (FLAGS_SET(operation, OPERATION_CREATE) && array->parent)
2293 r = process_item_array(array->parent, operation & OPERATION_CREATE);
2294
2295 /* Clean up all children first */
2296 if ((operation & (OPERATION_REMOVE|OPERATION_CLEAN)) && !set_isempty(array->children)) {
2297 Iterator i;
2298 ItemArray *c;
2299
2300 SET_FOREACH(c, array->children, i) {
2301 int k;
2302
2303 k = process_item_array(c, operation & (OPERATION_REMOVE|OPERATION_CLEAN));
2304 if (k < 0 && r == 0)
2305 r = k;
2306 }
2307 }
2308
2309 for (n = 0; n < array->n_items; n++) {
2310 int k;
2311
2312 k = process_item(array->items + n, operation);
2313 if (k < 0 && r == 0)
2314 r = k;
2315 }
2316
2317 return r;
2318 }
2319
2320 static void item_free_contents(Item *i) {
2321 assert(i);
2322 free(i->path);
2323 free(i->argument);
2324 strv_free(i->xattrs);
2325
2326 #if HAVE_ACL
2327 acl_free(i->acl_access);
2328 acl_free(i->acl_default);
2329 #endif
2330 }
2331
2332 static ItemArray* item_array_free(ItemArray *a) {
2333 size_t n;
2334
2335 if (!a)
2336 return NULL;
2337
2338 for (n = 0; n < a->n_items; n++)
2339 item_free_contents(a->items + n);
2340
2341 set_free(a->children);
2342 free(a->items);
2343 return mfree(a);
2344 }
2345
2346 static int item_compare(const Item *a, const Item *b) {
2347 /* Make sure that the ownership taking item is put first, so
2348 * that we first create the node, and then can adjust it */
2349
2350 if (takes_ownership(a->type) && !takes_ownership(b->type))
2351 return -1;
2352 if (!takes_ownership(a->type) && takes_ownership(b->type))
2353 return 1;
2354
2355 return CMP(a->type, b->type);
2356 }
2357
2358 static bool item_compatible(Item *a, Item *b) {
2359 assert(a);
2360 assert(b);
2361 assert(streq(a->path, b->path));
2362
2363 if (takes_ownership(a->type) && takes_ownership(b->type))
2364 /* check if the items are the same */
2365 return streq_ptr(a->argument, b->argument) &&
2366
2367 a->uid_set == b->uid_set &&
2368 a->uid == b->uid &&
2369
2370 a->gid_set == b->gid_set &&
2371 a->gid == b->gid &&
2372
2373 a->mode_set == b->mode_set &&
2374 a->mode == b->mode &&
2375
2376 a->age_set == b->age_set &&
2377 a->age == b->age &&
2378
2379 a->mask_perms == b->mask_perms &&
2380
2381 a->keep_first_level == b->keep_first_level &&
2382
2383 a->major_minor == b->major_minor;
2384
2385 return true;
2386 }
2387
2388 static bool should_include_path(const char *path) {
2389 char **prefix;
2390
2391 STRV_FOREACH(prefix, arg_exclude_prefixes)
2392 if (path_startswith(path, *prefix)) {
2393 log_debug("Entry \"%s\" matches exclude prefix \"%s\", skipping.",
2394 path, *prefix);
2395 return false;
2396 }
2397
2398 STRV_FOREACH(prefix, arg_include_prefixes)
2399 if (path_startswith(path, *prefix)) {
2400 log_debug("Entry \"%s\" matches include prefix \"%s\".", path, *prefix);
2401 return true;
2402 }
2403
2404 /* no matches, so we should include this path only if we
2405 * have no whitelist at all */
2406 if (strv_isempty(arg_include_prefixes))
2407 return true;
2408
2409 log_debug("Entry \"%s\" does not match any include prefix, skipping.", path);
2410 return false;
2411 }
2412
2413 static int specifier_expansion_from_arg(Item *i) {
2414 _cleanup_free_ char *unescaped = NULL, *resolved = NULL;
2415 char **xattr;
2416 int r;
2417
2418 assert(i);
2419
2420 if (!i->argument)
2421 return 0;
2422
2423 switch (i->type) {
2424 case COPY_FILES:
2425 case CREATE_SYMLINK:
2426 case CREATE_FILE:
2427 case TRUNCATE_FILE:
2428 case WRITE_FILE:
2429 r = cunescape(i->argument, 0, &unescaped);
2430 if (r < 0)
2431 return log_error_errno(r, "Failed to unescape parameter to write: %s", i->argument);
2432
2433 r = specifier_printf(unescaped, specifier_table, NULL, &resolved);
2434 if (r < 0)
2435 return r;
2436
2437 free_and_replace(i->argument, resolved);
2438 break;
2439
2440 case SET_XATTR:
2441 case RECURSIVE_SET_XATTR:
2442 STRV_FOREACH(xattr, i->xattrs) {
2443 r = specifier_printf(*xattr, specifier_table, NULL, &resolved);
2444 if (r < 0)
2445 return r;
2446
2447 free_and_replace(*xattr, resolved);
2448 }
2449 break;
2450
2451 default:
2452 break;
2453 }
2454 return 0;
2455 }
2456
2457 static int patch_var_run(const char *fname, unsigned line, char **path) {
2458 const char *k;
2459 char *n;
2460
2461 assert(path);
2462 assert(*path);
2463
2464 /* Optionally rewrites lines referencing /var/run/, to use /run/ instead. Why bother? tmpfiles merges lines in
2465 * some cases and detects conflicts in others. If files/directories are specified through two equivalent lines
2466 * this is problematic as neither case will be detected. Ideally we'd detect these cases by resolving symlinks
2467 * early, but that's precisely not what we can do here as this code very likely is running very early on, at a
2468 * time where the paths in question are not available yet, or even more importantly, our own tmpfiles rules
2469 * might create the paths that are intermediary to the listed paths. We can't really cover the generic case,
2470 * but the least we can do is cover the specific case of /var/run vs. /run, as /var/run is a legacy name for
2471 * /run only, and we explicitly document that and require that on systemd systems the former is a symlink to
2472 * the latter. Moreover files below this path are by far the primary usecase for tmpfiles.d/. */
2473
2474 k = path_startswith(*path, "/var/run/");
2475 if (isempty(k)) /* Don't complain about other paths than /var/run, and not about /var/run itself either. */
2476 return 0;
2477
2478 n = path_join("/run", k);
2479 if (!n)
2480 return log_oom();
2481
2482 /* Also log about this briefly. We do so at LOG_NOTICE level, as we fixed up the situation automatically, hence
2483 * there's no immediate need for action by the user. However, in the interest of making things less confusing
2484 * to the user, let's still inform the user that these snippets should really be updated. */
2485 log_syntax(NULL, LOG_NOTICE, fname, line, 0, "Line references path below legacy directory /var/run/, updating %s → %s; please update the tmpfiles.d/ drop-in file accordingly.", *path, n);
2486
2487 free_and_replace(*path, n);
2488
2489 return 0;
2490 }
2491
2492 static int find_uid(const char *user, uid_t *ret_uid, Hashmap **cache) {
2493 int r;
2494
2495 assert(user);
2496 assert(ret_uid);
2497
2498 /* First: parse as numeric UID string */
2499 r = parse_uid(user, ret_uid);
2500 if (r >= 0)
2501 return r;
2502
2503 /* Second: pass to NSS if we are running "online" */
2504 if (!arg_root)
2505 return get_user_creds(&user, ret_uid, NULL, NULL, NULL, 0);
2506
2507 /* Third, synthesize "root" unconditionally */
2508 if (streq(user, "root")) {
2509 *ret_uid = 0;
2510 return 0;
2511 }
2512
2513 /* Fourth: use fgetpwent() to read /etc/passwd directly, if we are "offline" */
2514 return name_to_uid_offline(arg_root, user, ret_uid, cache);
2515 }
2516
2517 static int find_gid(const char *group, gid_t *ret_gid, Hashmap **cache) {
2518 int r;
2519
2520 assert(group);
2521 assert(ret_gid);
2522
2523 /* First: parse as numeric GID string */
2524 r = parse_gid(group, ret_gid);
2525 if (r >= 0)
2526 return r;
2527
2528 /* Second: pass to NSS if we are running "online" */
2529 if (!arg_root)
2530 return get_group_creds(&group, ret_gid, 0);
2531
2532 /* Third, synthesize "root" unconditionally */
2533 if (streq(group, "root")) {
2534 *ret_gid = 0;
2535 return 0;
2536 }
2537
2538 /* Fourth: use fgetgrent() to read /etc/group directly, if we are "offline" */
2539 return name_to_gid_offline(arg_root, group, ret_gid, cache);
2540 }
2541
2542 static int parse_line(
2543 const char *fname,
2544 unsigned line,
2545 const char *buffer,
2546 bool *invalid_config,
2547 Hashmap **uid_cache,
2548 Hashmap **gid_cache) {
2549
2550 _cleanup_free_ char *action = NULL, *mode = NULL, *user = NULL, *group = NULL, *age = NULL, *path = NULL;
2551 _cleanup_(item_free_contents) Item i = {};
2552 ItemArray *existing;
2553 OrderedHashmap *h;
2554 int r, pos;
2555 bool append_or_force = false, boot = false, allow_failure = false;
2556
2557 assert(fname);
2558 assert(line >= 1);
2559 assert(buffer);
2560
2561 r = extract_many_words(
2562 &buffer,
2563 NULL,
2564 EXTRACT_UNQUOTE,
2565 &action,
2566 &path,
2567 &mode,
2568 &user,
2569 &group,
2570 &age,
2571 NULL);
2572 if (r < 0) {
2573 if (IN_SET(r, -EINVAL, -EBADSLT))
2574 /* invalid quoting and such or an unknown specifier */
2575 *invalid_config = true;
2576 return log_syntax(NULL, LOG_ERR, fname, line, r, "Failed to parse line: %m");
2577 } else if (r < 2) {
2578 *invalid_config = true;
2579 return log_syntax(NULL, LOG_ERR, fname, line, SYNTHETIC_ERRNO(EBADMSG), "Syntax error.");
2580 }
2581
2582 if (!empty_or_dash(buffer)) {
2583 i.argument = strdup(buffer);
2584 if (!i.argument)
2585 return log_oom();
2586 }
2587
2588 if (isempty(action)) {
2589 *invalid_config = true;
2590 return log_syntax(NULL, LOG_ERR, fname, line, SYNTHETIC_ERRNO(EBADMSG), "Command too short '%s'.", action);
2591 }
2592
2593 for (pos = 1; action[pos]; pos++) {
2594 if (action[pos] == '!' && !boot)
2595 boot = true;
2596 else if (action[pos] == '+' && !append_or_force)
2597 append_or_force = true;
2598 else if (action[pos] == '-' && !allow_failure)
2599 allow_failure = true;
2600 else {
2601 *invalid_config = true;
2602 return log_syntax(NULL, LOG_ERR, fname, line, SYNTHETIC_ERRNO(EBADMSG), "Unknown modifiers in command '%s'", action);
2603 }
2604 }
2605
2606 if (boot && !arg_boot) {
2607 log_syntax(NULL, LOG_DEBUG, fname, line, 0, "Ignoring entry %s \"%s\" because --boot is not specified.", action, path);
2608 return 0;
2609 }
2610
2611 i.type = action[0];
2612 i.append_or_force = append_or_force;
2613 i.allow_failure = allow_failure;
2614
2615 r = specifier_printf(path, specifier_table, NULL, &i.path);
2616 if (r == -ENXIO)
2617 return log_unresolvable_specifier(fname, line);
2618 if (r < 0) {
2619 if (IN_SET(r, -EINVAL, -EBADSLT))
2620 *invalid_config = true;
2621 return log_syntax(NULL, LOG_ERR, fname, line, r, "Failed to replace specifiers in '%s': %m", path);
2622 }
2623
2624 r = patch_var_run(fname, line, &i.path);
2625 if (r < 0)
2626 return r;
2627
2628 switch (i.type) {
2629
2630 case CREATE_DIRECTORY:
2631 case CREATE_SUBVOLUME:
2632 case CREATE_SUBVOLUME_INHERIT_QUOTA:
2633 case CREATE_SUBVOLUME_NEW_QUOTA:
2634 case EMPTY_DIRECTORY:
2635 case TRUNCATE_DIRECTORY:
2636 case CREATE_FIFO:
2637 case IGNORE_PATH:
2638 case IGNORE_DIRECTORY_PATH:
2639 case REMOVE_PATH:
2640 case RECURSIVE_REMOVE_PATH:
2641 case ADJUST_MODE:
2642 case RELABEL_PATH:
2643 case RECURSIVE_RELABEL_PATH:
2644 if (i.argument)
2645 log_syntax(NULL, LOG_WARNING, fname, line, 0, "%c lines don't take argument fields, ignoring.", i.type);
2646
2647 break;
2648
2649 case CREATE_FILE:
2650 case TRUNCATE_FILE:
2651 break;
2652
2653 case CREATE_SYMLINK:
2654 if (!i.argument) {
2655 i.argument = path_join("/usr/share/factory", i.path);
2656 if (!i.argument)
2657 return log_oom();
2658 }
2659 break;
2660
2661 case WRITE_FILE:
2662 if (!i.argument) {
2663 *invalid_config = true;
2664 return log_syntax(NULL, LOG_ERR, fname, line, SYNTHETIC_ERRNO(EBADMSG), "Write file requires argument.");
2665 }
2666 break;
2667
2668 case COPY_FILES:
2669 if (!i.argument) {
2670 i.argument = path_join("/usr/share/factory", i.path);
2671 if (!i.argument)
2672 return log_oom();
2673
2674 } else if (!path_is_absolute(i.argument)) {
2675 *invalid_config = true;
2676 return log_syntax(NULL, LOG_ERR, fname, line, SYNTHETIC_ERRNO(EBADMSG), "Source path '%s' is not absolute.", i.argument);
2677
2678 }
2679
2680 if (!empty_or_root(arg_root)) {
2681 char *p;
2682
2683 p = path_join(arg_root, i.argument);
2684 if (!p)
2685 return log_oom();
2686 free_and_replace(i.argument, p);
2687 }
2688
2689 path_simplify(i.argument, false);
2690 break;
2691
2692 case CREATE_CHAR_DEVICE:
2693 case CREATE_BLOCK_DEVICE:
2694 if (!i.argument) {
2695 *invalid_config = true;
2696 return log_syntax(NULL, LOG_ERR, fname, line, SYNTHETIC_ERRNO(EBADMSG), "Device file requires argument.");
2697 }
2698
2699 r = parse_dev(i.argument, &i.major_minor);
2700 if (r < 0) {
2701 *invalid_config = true;
2702 return log_syntax(NULL, LOG_ERR, fname, line, r, "Can't parse device file major/minor '%s'.", i.argument);
2703 }
2704
2705 break;
2706
2707 case SET_XATTR:
2708 case RECURSIVE_SET_XATTR:
2709 if (!i.argument) {
2710 *invalid_config = true;
2711 return log_syntax(NULL, LOG_ERR, fname, line, SYNTHETIC_ERRNO(EBADMSG),
2712 "Set extended attribute requires argument.");
2713 }
2714 r = parse_xattrs_from_arg(&i);
2715 if (r < 0)
2716 return r;
2717 break;
2718
2719 case SET_ACL:
2720 case RECURSIVE_SET_ACL:
2721 if (!i.argument) {
2722 *invalid_config = true;
2723 return log_syntax(NULL, LOG_ERR, fname, line, SYNTHETIC_ERRNO(EBADMSG),
2724 "Set ACLs requires argument.");
2725 }
2726 r = parse_acls_from_arg(&i);
2727 if (r < 0)
2728 return r;
2729 break;
2730
2731 case SET_ATTRIBUTE:
2732 case RECURSIVE_SET_ATTRIBUTE:
2733 if (!i.argument) {
2734 *invalid_config = true;
2735 return log_syntax(NULL, LOG_ERR, fname, line, SYNTHETIC_ERRNO(EBADMSG),
2736 "Set file attribute requires argument.");
2737 }
2738 r = parse_attribute_from_arg(&i);
2739 if (IN_SET(r, -EINVAL, -EBADSLT))
2740 *invalid_config = true;
2741 if (r < 0)
2742 return r;
2743 break;
2744
2745 default:
2746 *invalid_config = true;
2747 return log_syntax(NULL, LOG_ERR, fname, line, SYNTHETIC_ERRNO(EBADMSG),
2748 "Unknown command type '%c'.", (char) i.type);
2749 }
2750
2751 if (!path_is_absolute(i.path)) {
2752 *invalid_config = true;
2753 return log_syntax(NULL, LOG_ERR, fname, line, SYNTHETIC_ERRNO(EBADMSG),
2754 "Path '%s' not absolute.", i.path);
2755 }
2756
2757 path_simplify(i.path, false);
2758
2759 if (!should_include_path(i.path))
2760 return 0;
2761
2762 r = specifier_expansion_from_arg(&i);
2763 if (r == -ENXIO)
2764 return log_unresolvable_specifier(fname, line);
2765 if (r < 0) {
2766 if (IN_SET(r, -EINVAL, -EBADSLT))
2767 *invalid_config = true;
2768 return log_syntax(NULL, LOG_ERR, fname, line, r, "Failed to substitute specifiers in argument: %m");
2769 }
2770
2771 if (!empty_or_root(arg_root)) {
2772 char *p;
2773
2774 p = path_join(arg_root, i.path);
2775 if (!p)
2776 return log_oom();
2777 free_and_replace(i.path, p);
2778 }
2779
2780 if (!empty_or_dash(user)) {
2781 r = find_uid(user, &i.uid, uid_cache);
2782 if (r < 0) {
2783 *invalid_config = true;
2784 return log_syntax(NULL, LOG_ERR, fname, line, r, "Failed to resolve user '%s': %m", user);
2785 }
2786
2787 i.uid_set = true;
2788 }
2789
2790 if (!empty_or_dash(group)) {
2791 r = find_gid(group, &i.gid, gid_cache);
2792 if (r < 0) {
2793 *invalid_config = true;
2794 return log_syntax(NULL, LOG_ERR, fname, line, r, "Failed to resolve group '%s'.", group);
2795 }
2796
2797 i.gid_set = true;
2798 }
2799
2800 if (!empty_or_dash(mode)) {
2801 const char *mm = mode;
2802 unsigned m;
2803
2804 if (*mm == '~') {
2805 i.mask_perms = true;
2806 mm++;
2807 }
2808
2809 r = parse_mode(mm, &m);
2810 if (r < 0) {
2811 *invalid_config = true;
2812 return log_syntax(NULL, LOG_ERR, fname, line, r, "Invalid mode '%s'.", mode);
2813 }
2814
2815 i.mode = m;
2816 i.mode_set = true;
2817 } else
2818 i.mode = IN_SET(i.type, CREATE_DIRECTORY, TRUNCATE_DIRECTORY, CREATE_SUBVOLUME, CREATE_SUBVOLUME_INHERIT_QUOTA, CREATE_SUBVOLUME_NEW_QUOTA) ? 0755 : 0644;
2819
2820 if (!empty_or_dash(age)) {
2821 const char *a = age;
2822
2823 if (*a == '~') {
2824 i.keep_first_level = true;
2825 a++;
2826 }
2827
2828 r = parse_sec(a, &i.age);
2829 if (r < 0) {
2830 *invalid_config = true;
2831 return log_syntax(NULL, LOG_ERR, fname, line, r, "Invalid age '%s'.", age);
2832 }
2833
2834 i.age_set = true;
2835 }
2836
2837 h = needs_glob(i.type) ? globs : items;
2838
2839 existing = ordered_hashmap_get(h, i.path);
2840 if (existing) {
2841 size_t n;
2842
2843 for (n = 0; n < existing->n_items; n++) {
2844 if (!item_compatible(existing->items + n, &i) && !i.append_or_force) {
2845 log_syntax(NULL, LOG_NOTICE, fname, line, 0, "Duplicate line for path \"%s\", ignoring.", i.path);
2846 return 0;
2847 }
2848 }
2849 } else {
2850 existing = new0(ItemArray, 1);
2851 if (!existing)
2852 return log_oom();
2853
2854 r = ordered_hashmap_put(h, i.path, existing);
2855 if (r < 0) {
2856 free(existing);
2857 return log_oom();
2858 }
2859 }
2860
2861 if (!GREEDY_REALLOC(existing->items, existing->allocated, existing->n_items + 1))
2862 return log_oom();
2863
2864 existing->items[existing->n_items++] = i;
2865 i = (struct Item) {};
2866
2867 /* Sort item array, to enforce stable ordering of application */
2868 typesafe_qsort(existing->items, existing->n_items, item_compare);
2869
2870 return 0;
2871 }
2872
2873 static int cat_config(char **config_dirs, char **args) {
2874 _cleanup_strv_free_ char **files = NULL;
2875 int r;
2876
2877 r = conf_files_list_with_replacement(arg_root, config_dirs, arg_replace, &files, NULL);
2878 if (r < 0)
2879 return r;
2880
2881 return cat_files(NULL, files, 0);
2882 }
2883
2884 static int help(void) {
2885 _cleanup_free_ char *link = NULL;
2886 int r;
2887
2888 r = terminal_urlify_man("systemd-tmpfiles", "8", &link);
2889 if (r < 0)
2890 return log_oom();
2891
2892 printf("%s [OPTIONS...] [CONFIGURATION FILE...]\n\n"
2893 "Creates, deletes and cleans up volatile and temporary files and directories.\n\n"
2894 " -h --help Show this help\n"
2895 " --user Execute user configuration\n"
2896 " --version Show package version\n"
2897 " --cat-config Show configuration files\n"
2898 " --create Create marked files/directories\n"
2899 " --clean Clean up marked directories\n"
2900 " --remove Remove marked files/directories\n"
2901 " --boot Execute actions only safe at boot\n"
2902 " --prefix=PATH Only apply rules with the specified prefix\n"
2903 " --exclude-prefix=PATH Ignore rules with the specified prefix\n"
2904 " --root=PATH Operate on an alternate filesystem root\n"
2905 " --replace=PATH Treat arguments as replacement for PATH\n"
2906 " --no-pager Do not pipe output into a pager\n"
2907 "\nSee the %s for details.\n"
2908 , program_invocation_short_name
2909 , link
2910 );
2911
2912 return 0;
2913 }
2914
2915 static int parse_argv(int argc, char *argv[]) {
2916
2917 enum {
2918 ARG_VERSION = 0x100,
2919 ARG_CAT_CONFIG,
2920 ARG_USER,
2921 ARG_CREATE,
2922 ARG_CLEAN,
2923 ARG_REMOVE,
2924 ARG_BOOT,
2925 ARG_PREFIX,
2926 ARG_EXCLUDE_PREFIX,
2927 ARG_ROOT,
2928 ARG_REPLACE,
2929 ARG_NO_PAGER,
2930 };
2931
2932 static const struct option options[] = {
2933 { "help", no_argument, NULL, 'h' },
2934 { "user", no_argument, NULL, ARG_USER },
2935 { "version", no_argument, NULL, ARG_VERSION },
2936 { "cat-config", no_argument, NULL, ARG_CAT_CONFIG },
2937 { "create", no_argument, NULL, ARG_CREATE },
2938 { "clean", no_argument, NULL, ARG_CLEAN },
2939 { "remove", no_argument, NULL, ARG_REMOVE },
2940 { "boot", no_argument, NULL, ARG_BOOT },
2941 { "prefix", required_argument, NULL, ARG_PREFIX },
2942 { "exclude-prefix", required_argument, NULL, ARG_EXCLUDE_PREFIX },
2943 { "root", required_argument, NULL, ARG_ROOT },
2944 { "replace", required_argument, NULL, ARG_REPLACE },
2945 { "no-pager", no_argument, NULL, ARG_NO_PAGER },
2946 {}
2947 };
2948
2949 int c, r;
2950
2951 assert(argc >= 0);
2952 assert(argv);
2953
2954 while ((c = getopt_long(argc, argv, "h", options, NULL)) >= 0)
2955
2956 switch (c) {
2957
2958 case 'h':
2959 return help();
2960
2961 case ARG_VERSION:
2962 return version();
2963
2964 case ARG_CAT_CONFIG:
2965 arg_cat_config = true;
2966 break;
2967
2968 case ARG_USER:
2969 arg_user = true;
2970 break;
2971
2972 case ARG_CREATE:
2973 arg_operation |= OPERATION_CREATE;
2974 break;
2975
2976 case ARG_CLEAN:
2977 arg_operation |= OPERATION_CLEAN;
2978 break;
2979
2980 case ARG_REMOVE:
2981 arg_operation |= OPERATION_REMOVE;
2982 break;
2983
2984 case ARG_BOOT:
2985 arg_boot = true;
2986 break;
2987
2988 case ARG_PREFIX:
2989 if (strv_push(&arg_include_prefixes, optarg) < 0)
2990 return log_oom();
2991 break;
2992
2993 case ARG_EXCLUDE_PREFIX:
2994 if (strv_push(&arg_exclude_prefixes, optarg) < 0)
2995 return log_oom();
2996 break;
2997
2998 case ARG_ROOT:
2999 r = parse_path_argument_and_warn(optarg, /* suppress_root= */ false, &arg_root);
3000 if (r < 0)
3001 return r;
3002 break;
3003
3004 case ARG_REPLACE:
3005 if (!path_is_absolute(optarg) ||
3006 !endswith(optarg, ".conf"))
3007 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
3008 "The argument to --replace= must an absolute path to a config file");
3009
3010 arg_replace = optarg;
3011 break;
3012
3013 case ARG_NO_PAGER:
3014 arg_pager_flags |= PAGER_DISABLE;
3015 break;
3016
3017 case '?':
3018 return -EINVAL;
3019
3020 default:
3021 assert_not_reached("Unhandled option");
3022 }
3023
3024 if (arg_operation == 0 && !arg_cat_config)
3025 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
3026 "You need to specify at least one of --clean, --create or --remove.");
3027
3028 if (arg_replace && arg_cat_config)
3029 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
3030 "Option --replace= is not supported with --cat-config");
3031
3032 if (arg_replace && optind >= argc)
3033 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
3034 "When --replace= is given, some configuration items must be specified");
3035
3036 return 1;
3037 }
3038
3039 static int read_config_file(char **config_dirs, const char *fn, bool ignore_enoent, bool *invalid_config) {
3040 _cleanup_(hashmap_freep) Hashmap *uid_cache = NULL, *gid_cache = NULL;
3041 _cleanup_fclose_ FILE *_f = NULL;
3042 Iterator iterator;
3043 unsigned v = 0;
3044 FILE *f;
3045 Item *i;
3046 int r = 0;
3047
3048 assert(fn);
3049
3050 if (streq(fn, "-")) {
3051 log_debug("Reading config from stdin…");
3052 fn = "<stdin>";
3053 f = stdin;
3054 } else {
3055 r = search_and_fopen(fn, "re", arg_root, (const char**) config_dirs, &_f);
3056 if (r < 0) {
3057 if (ignore_enoent && r == -ENOENT) {
3058 log_debug_errno(r, "Failed to open \"%s\", ignoring: %m", fn);
3059 return 0;
3060 }
3061
3062 return log_error_errno(r, "Failed to open '%s': %m", fn);
3063 }
3064 log_debug("Reading config file \"%s\"…", fn);
3065 f = _f;
3066 }
3067
3068 for (;;) {
3069 _cleanup_free_ char *line = NULL;
3070 bool invalid_line = false;
3071 char *l;
3072 int k;
3073
3074 k = read_line(f, LONG_LINE_MAX, &line);
3075 if (k < 0)
3076 return log_error_errno(k, "Failed to read '%s': %m", fn);
3077 if (k == 0)
3078 break;
3079
3080 v++;
3081
3082 l = strstrip(line);
3083 if (IN_SET(*l, 0, '#'))
3084 continue;
3085
3086 k = parse_line(fn, v, l, &invalid_line, &uid_cache, &gid_cache);
3087 if (k < 0) {
3088 if (invalid_line)
3089 /* Allow reporting with a special code if the caller requested this */
3090 *invalid_config = true;
3091 else if (r == 0)
3092 /* The first error becomes our return value */
3093 r = k;
3094 }
3095 }
3096
3097 /* we have to determine age parameter for each entry of type X */
3098 ORDERED_HASHMAP_FOREACH(i, globs, iterator) {
3099 Iterator iter;
3100 Item *j, *candidate_item = NULL;
3101
3102 if (i->type != IGNORE_DIRECTORY_PATH)
3103 continue;
3104
3105 ORDERED_HASHMAP_FOREACH(j, items, iter) {
3106 if (!IN_SET(j->type, CREATE_DIRECTORY, TRUNCATE_DIRECTORY, CREATE_SUBVOLUME, CREATE_SUBVOLUME_INHERIT_QUOTA, CREATE_SUBVOLUME_NEW_QUOTA))
3107 continue;
3108
3109 if (path_equal(j->path, i->path)) {
3110 candidate_item = j;
3111 break;
3112 }
3113
3114 if ((!candidate_item && path_startswith(i->path, j->path)) ||
3115 (candidate_item && path_startswith(j->path, candidate_item->path) && (fnmatch(i->path, j->path, FNM_PATHNAME | FNM_PERIOD) == 0)))
3116 candidate_item = j;
3117 }
3118
3119 if (candidate_item && candidate_item->age_set) {
3120 i->age = candidate_item->age;
3121 i->age_set = true;
3122 }
3123 }
3124
3125 if (ferror(f)) {
3126 log_error_errno(errno, "Failed to read from file %s: %m", fn);
3127 if (r == 0)
3128 r = -EIO;
3129 }
3130
3131 return r;
3132 }
3133
3134 static int parse_arguments(char **config_dirs, char **args, bool *invalid_config) {
3135 char **arg;
3136 int r;
3137
3138 STRV_FOREACH(arg, args) {
3139 r = read_config_file(config_dirs, *arg, false, invalid_config);
3140 if (r < 0)
3141 return r;
3142 }
3143
3144 return 0;
3145 }
3146
3147 static int read_config_files(char **config_dirs, char **args, bool *invalid_config) {
3148 _cleanup_strv_free_ char **files = NULL;
3149 _cleanup_free_ char *p = NULL;
3150 char **f;
3151 int r;
3152
3153 r = conf_files_list_with_replacement(arg_root, config_dirs, arg_replace, &files, &p);
3154 if (r < 0)
3155 return r;
3156
3157 STRV_FOREACH(f, files)
3158 if (p && path_equal(*f, p)) {
3159 log_debug("Parsing arguments at position \"%s\"…", *f);
3160
3161 r = parse_arguments(config_dirs, args, invalid_config);
3162 if (r < 0)
3163 return r;
3164 } else
3165 /* Just warn, ignore result otherwise.
3166 * read_config_file() has some debug output, so no need to print anything. */
3167 (void) read_config_file(config_dirs, *f, true, invalid_config);
3168
3169 return 0;
3170 }
3171
3172 static int link_parent(ItemArray *a) {
3173 const char *path;
3174 char *prefix;
3175 int r;
3176
3177 assert(a);
3178
3179 /* Finds the closest "parent" item array for the specified item array. Then registers the specified item array
3180 * as child of it, and fills the parent in, linking them both ways. This allows us to later create parents
3181 * before their children, and clean up/remove children before their parents. */
3182
3183 if (a->n_items <= 0)
3184 return 0;
3185
3186 path = a->items[0].path;
3187 prefix = newa(char, strlen(path) + 1);
3188 PATH_FOREACH_PREFIX(prefix, path) {
3189 ItemArray *j;
3190
3191 j = ordered_hashmap_get(items, prefix);
3192 if (!j)
3193 j = ordered_hashmap_get(globs, prefix);
3194 if (j) {
3195 r = set_ensure_allocated(&j->children, NULL);
3196 if (r < 0)
3197 return log_oom();
3198
3199 r = set_put(j->children, a);
3200 if (r < 0)
3201 return log_oom();
3202
3203 a->parent = j;
3204 return 1;
3205 }
3206 }
3207
3208 return 0;
3209 }
3210
3211 DEFINE_PRIVATE_HASH_OPS_WITH_VALUE_DESTRUCTOR(item_array_hash_ops, char, string_hash_func, string_compare_func,
3212 ItemArray, item_array_free);
3213
3214 static int run(int argc, char *argv[]) {
3215 _cleanup_strv_free_ char **config_dirs = NULL;
3216 bool invalid_config = false;
3217 Iterator iterator;
3218 ItemArray *a;
3219 enum {
3220 PHASE_REMOVE_AND_CLEAN,
3221 PHASE_CREATE,
3222 _PHASE_MAX
3223 } phase;
3224 int r, k;
3225
3226 r = parse_argv(argc, argv);
3227 if (r <= 0)
3228 return r;
3229
3230 log_setup_service();
3231
3232 /* Descending down file system trees might take a lot of fds */
3233 (void) rlimit_nofile_bump(HIGH_RLIMIT_NOFILE);
3234
3235 if (arg_user) {
3236 r = user_config_paths(&config_dirs);
3237 if (r < 0)
3238 return log_error_errno(r, "Failed to initialize configuration directory list: %m");
3239 } else {
3240 config_dirs = strv_split_nulstr(CONF_PATHS_NULSTR("tmpfiles.d"));
3241 if (!config_dirs)
3242 return log_oom();
3243 }
3244
3245 if (DEBUG_LOGGING) {
3246 _cleanup_free_ char *t = NULL;
3247
3248 t = strv_join(config_dirs, "\n\t");
3249 if (t)
3250 log_debug("Looking for configuration files in (higher priority first):\n\t%s", t);
3251 }
3252
3253 if (arg_cat_config) {
3254 (void) pager_open(arg_pager_flags);
3255
3256 return cat_config(config_dirs, argv + optind);
3257 }
3258
3259 umask(0022);
3260
3261 mac_selinux_init();
3262
3263 items = ordered_hashmap_new(&item_array_hash_ops);
3264 globs = ordered_hashmap_new(&item_array_hash_ops);
3265 if (!items || !globs)
3266 return log_oom();
3267
3268 /* If command line arguments are specified along with --replace, read all
3269 * configuration files and insert the positional arguments at the specified
3270 * place. Otherwise, if command line arguments are specified, execute just
3271 * them, and finally, without --replace= or any positional arguments, just
3272 * read configuration and execute it.
3273 */
3274 if (arg_replace || optind >= argc)
3275 r = read_config_files(config_dirs, argv + optind, &invalid_config);
3276 else
3277 r = parse_arguments(config_dirs, argv + optind, &invalid_config);
3278 if (r < 0)
3279 return r;
3280
3281 /* Let's now link up all child/parent relationships */
3282 ORDERED_HASHMAP_FOREACH(a, items, iterator) {
3283 r = link_parent(a);
3284 if (r < 0)
3285 return r;
3286 }
3287 ORDERED_HASHMAP_FOREACH(a, globs, iterator) {
3288 r = link_parent(a);
3289 if (r < 0)
3290 return r;
3291 }
3292
3293 /* If multiple operations are requested, let's first run the remove/clean operations, and only then the create
3294 * operations. i.e. that we first clean out the platform we then build on. */
3295 for (phase = 0; phase < _PHASE_MAX; phase++) {
3296 OperationMask op;
3297
3298 if (phase == PHASE_REMOVE_AND_CLEAN)
3299 op = arg_operation & (OPERATION_REMOVE|OPERATION_CLEAN);
3300 else if (phase == PHASE_CREATE)
3301 op = arg_operation & OPERATION_CREATE;
3302 else
3303 assert_not_reached("unexpected phase");
3304
3305 if (op == 0) /* Nothing requested in this phase */
3306 continue;
3307
3308 /* The non-globbing ones usually create things, hence we apply them first */
3309 ORDERED_HASHMAP_FOREACH(a, items, iterator) {
3310 k = process_item_array(a, op);
3311 if (k < 0 && r >= 0)
3312 r = k;
3313 }
3314
3315 /* The globbing ones usually alter things, hence we apply them second. */
3316 ORDERED_HASHMAP_FOREACH(a, globs, iterator) {
3317 k = process_item_array(a, op);
3318 if (k < 0 && r >= 0)
3319 r = k;
3320 }
3321 }
3322
3323 if (ERRNO_IS_RESOURCE(-r))
3324 return r;
3325 if (invalid_config)
3326 return EX_DATAERR;
3327 if (r < 0)
3328 return EX_CANTCREAT;
3329 return 0;
3330 }
3331
3332 DEFINE_MAIN_FUNCTION_WITH_POSITIVE_FAILURE(run);
Unnamed repository; edit this file 'description' to name the repository.