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[thirdparty/systemd.git] / src / tmpfiles / tmpfiles.c
1 /* SPDX-License-Identifier: LGPL-2.1-or-later */
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 "dissect-image.h"
30 #include "env-util.h"
31 #include "escape.h"
32 #include "fd-util.h"
33 #include "fileio.h"
34 #include "format-util.h"
35 #include "fs-util.h"
36 #include "glob-util.h"
37 #include "io-util.h"
38 #include "label.h"
39 #include "log.h"
40 #include "macro.h"
41 #include "main-func.h"
42 #include "missing_stat.h"
43 #include "missing_syscall.h"
44 #include "mkdir.h"
45 #include "mount-util.h"
46 #include "mountpoint-util.h"
47 #include "offline-passwd.h"
48 #include "pager.h"
49 #include "parse-argument.h"
50 #include "parse-util.h"
51 #include "path-lookup.h"
52 #include "path-util.h"
53 #include "pretty-print.h"
54 #include "rlimit-util.h"
55 #include "rm-rf.h"
56 #include "selinux-util.h"
57 #include "set.h"
58 #include "sort-util.h"
59 #include "specifier.h"
60 #include "stat-util.h"
61 #include "stdio-util.h"
62 #include "string-table.h"
63 #include "string-util.h"
64 #include "strv.h"
65 #include "terminal-util.h"
66 #include "umask-util.h"
67 #include "user-util.h"
68
69 /* This reads all files listed in /etc/tmpfiles.d/?*.conf and creates
70 * them in the file system. This is intended to be used to create
71 * properly owned directories beneath /tmp, /var/tmp, /run, which are
72 * volatile and hence need to be recreated on bootup. */
73
74 typedef enum OperationMask {
75 OPERATION_CREATE = 1 << 0,
76 OPERATION_REMOVE = 1 << 1,
77 OPERATION_CLEAN = 1 << 2,
78 } OperationMask;
79
80 typedef enum ItemType {
81 /* These ones take file names */
82 CREATE_FILE = 'f',
83 TRUNCATE_FILE = 'F', /* deprecated: use f+ */
84 CREATE_DIRECTORY = 'd',
85 TRUNCATE_DIRECTORY = 'D',
86 CREATE_SUBVOLUME = 'v',
87 CREATE_SUBVOLUME_INHERIT_QUOTA = 'q',
88 CREATE_SUBVOLUME_NEW_QUOTA = 'Q',
89 CREATE_FIFO = 'p',
90 CREATE_SYMLINK = 'L',
91 CREATE_CHAR_DEVICE = 'c',
92 CREATE_BLOCK_DEVICE = 'b',
93 COPY_FILES = 'C',
94
95 /* These ones take globs */
96 WRITE_FILE = 'w',
97 EMPTY_DIRECTORY = 'e',
98 SET_XATTR = 't',
99 RECURSIVE_SET_XATTR = 'T',
100 SET_ACL = 'a',
101 RECURSIVE_SET_ACL = 'A',
102 SET_ATTRIBUTE = 'h',
103 RECURSIVE_SET_ATTRIBUTE = 'H',
104 IGNORE_PATH = 'x',
105 IGNORE_DIRECTORY_PATH = 'X',
106 REMOVE_PATH = 'r',
107 RECURSIVE_REMOVE_PATH = 'R',
108 RELABEL_PATH = 'z',
109 RECURSIVE_RELABEL_PATH = 'Z',
110 ADJUST_MODE = 'm', /* legacy, 'z' is identical to this */
111 } ItemType;
112
113 typedef struct Item {
114 ItemType type;
115
116 char *path;
117 char *argument;
118 char **xattrs;
119 #if HAVE_ACL
120 acl_t acl_access;
121 acl_t acl_default;
122 #endif
123 uid_t uid;
124 gid_t gid;
125 mode_t mode;
126 usec_t age;
127
128 dev_t major_minor;
129 unsigned attribute_value;
130 unsigned attribute_mask;
131
132 bool uid_set:1;
133 bool gid_set:1;
134 bool mode_set:1;
135 bool age_set:1;
136 bool mask_perms:1;
137 bool attribute_set:1;
138
139 bool keep_first_level:1;
140
141 bool append_or_force:1;
142
143 bool allow_failure:1;
144
145 OperationMask done;
146 } Item;
147
148 typedef struct ItemArray {
149 Item *items;
150 size_t n_items;
151
152 struct ItemArray *parent;
153 Set *children;
154 } ItemArray;
155
156 typedef enum DirectoryType {
157 DIRECTORY_RUNTIME,
158 DIRECTORY_STATE,
159 DIRECTORY_CACHE,
160 DIRECTORY_LOGS,
161 _DIRECTORY_TYPE_MAX,
162 } DirectoryType;
163
164 static bool arg_cat_config = false;
165 static bool arg_user = false;
166 static OperationMask arg_operation = 0;
167 static bool arg_boot = false;
168 static PagerFlags arg_pager_flags = 0;
169
170 static char **arg_include_prefixes = NULL;
171 static char **arg_exclude_prefixes = NULL;
172 static char *arg_root = NULL;
173 static char *arg_image = NULL;
174 static char *arg_replace = NULL;
175
176 #define MAX_DEPTH 256
177
178 static OrderedHashmap *items = NULL, *globs = NULL;
179 static Set *unix_sockets = NULL;
180
181 STATIC_DESTRUCTOR_REGISTER(items, ordered_hashmap_freep);
182 STATIC_DESTRUCTOR_REGISTER(globs, ordered_hashmap_freep);
183 STATIC_DESTRUCTOR_REGISTER(unix_sockets, set_free_freep);
184 STATIC_DESTRUCTOR_REGISTER(arg_include_prefixes, freep);
185 STATIC_DESTRUCTOR_REGISTER(arg_exclude_prefixes, freep);
186 STATIC_DESTRUCTOR_REGISTER(arg_root, freep);
187 STATIC_DESTRUCTOR_REGISTER(arg_image, freep);
188
189 static int specifier_machine_id_safe(char specifier, const void *data, const void *userdata, char **ret);
190 static int specifier_directory(char specifier, const void *data, const void *userdata, char **ret);
191
192 static const Specifier specifier_table[] = {
193 { 'a', specifier_architecture, NULL },
194 { 'b', specifier_boot_id, NULL },
195 { 'B', specifier_os_build_id, NULL },
196 { 'H', specifier_host_name, NULL },
197 { 'l', specifier_short_host_name, NULL },
198 { 'm', specifier_machine_id_safe, NULL },
199 { 'o', specifier_os_id, NULL },
200 { 'v', specifier_kernel_release, NULL },
201 { 'w', specifier_os_version_id, NULL },
202 { 'W', specifier_os_variant_id, NULL },
203
204 { 'h', specifier_user_home, NULL },
205
206 { 'C', specifier_directory, UINT_TO_PTR(DIRECTORY_CACHE) },
207 { 'L', specifier_directory, UINT_TO_PTR(DIRECTORY_LOGS) },
208 { 'S', specifier_directory, UINT_TO_PTR(DIRECTORY_STATE) },
209 { 't', specifier_directory, UINT_TO_PTR(DIRECTORY_RUNTIME) },
210
211 COMMON_CREDS_SPECIFIERS,
212
213 COMMON_TMP_SPECIFIERS,
214 {}
215 };
216
217 static int specifier_machine_id_safe(char specifier, const void *data, const void *userdata, char **ret) {
218 int r;
219
220 /* If /etc/machine_id is missing or empty (e.g. in a chroot environment)
221 * return a recognizable error so that the caller can skip the rule
222 * gracefully. */
223
224 r = specifier_machine_id(specifier, data, userdata, ret);
225 if (IN_SET(r, -ENOENT, -ENOMEDIUM))
226 return -ENXIO;
227
228 return r;
229 }
230
231 static int specifier_directory(char specifier, const void *data, const void *userdata, char **ret) {
232 struct table_entry {
233 uint64_t type;
234 const char *suffix;
235 };
236
237 static const struct table_entry paths_system[] = {
238 [DIRECTORY_RUNTIME] = { SD_PATH_SYSTEM_RUNTIME },
239 [DIRECTORY_STATE] = { SD_PATH_SYSTEM_STATE_PRIVATE },
240 [DIRECTORY_CACHE] = { SD_PATH_SYSTEM_STATE_CACHE },
241 [DIRECTORY_LOGS] = { SD_PATH_SYSTEM_STATE_LOGS },
242 };
243
244 static const struct table_entry paths_user[] = {
245 [DIRECTORY_RUNTIME] = { SD_PATH_USER_RUNTIME },
246 [DIRECTORY_STATE] = { SD_PATH_USER_CONFIGURATION },
247 [DIRECTORY_CACHE] = { SD_PATH_USER_STATE_CACHE },
248 [DIRECTORY_LOGS] = { SD_PATH_USER_CONFIGURATION, "log" },
249 };
250
251 unsigned i;
252 const struct table_entry *paths;
253
254 assert_cc(ELEMENTSOF(paths_system) == ELEMENTSOF(paths_user));
255 paths = arg_user ? paths_user : paths_system;
256
257 i = PTR_TO_UINT(data);
258 assert(i < ELEMENTSOF(paths_system));
259
260 return sd_path_lookup(paths[i].type, paths[i].suffix, ret);
261 }
262
263 static int log_unresolvable_specifier(const char *filename, unsigned line) {
264 static bool notified = false;
265
266 /* In system mode, this is called when /etc is not fully initialized (e.g.
267 * in a chroot environment) where some specifiers are unresolvable. In user
268 * mode, this is called when some variables are not defined. These cases are
269 * not considered as an error so log at LOG_NOTICE only for the first time
270 * and then downgrade this to LOG_DEBUG for the rest. */
271
272 log_syntax(NULL,
273 notified ? LOG_DEBUG : LOG_NOTICE,
274 filename, line, 0,
275 "Failed to resolve specifier: %s, skipping",
276 arg_user ? "Required $XDG_... variable not defined" : "uninitialized /etc detected");
277
278 if (!notified)
279 log_notice("All rules containing unresolvable specifiers will be skipped.");
280
281 notified = true;
282 return 0;
283 }
284
285 static int user_config_paths(char*** ret) {
286 _cleanup_strv_free_ char **config_dirs = NULL, **data_dirs = NULL;
287 _cleanup_free_ char *persistent_config = NULL, *runtime_config = NULL, *data_home = NULL;
288 _cleanup_strv_free_ char **res = NULL;
289 int r;
290
291 r = xdg_user_dirs(&config_dirs, &data_dirs);
292 if (r < 0)
293 return r;
294
295 r = xdg_user_config_dir(&persistent_config, "/user-tmpfiles.d");
296 if (r < 0 && r != -ENXIO)
297 return r;
298
299 r = xdg_user_runtime_dir(&runtime_config, "/user-tmpfiles.d");
300 if (r < 0 && r != -ENXIO)
301 return r;
302
303 r = xdg_user_data_dir(&data_home, "/user-tmpfiles.d");
304 if (r < 0 && r != -ENXIO)
305 return r;
306
307 r = strv_extend_strv_concat(&res, config_dirs, "/user-tmpfiles.d");
308 if (r < 0)
309 return r;
310
311 r = strv_extend(&res, persistent_config);
312 if (r < 0)
313 return r;
314
315 r = strv_extend(&res, runtime_config);
316 if (r < 0)
317 return r;
318
319 r = strv_extend(&res, data_home);
320 if (r < 0)
321 return r;
322
323 r = strv_extend_strv_concat(&res, data_dirs, "/user-tmpfiles.d");
324 if (r < 0)
325 return r;
326
327 r = path_strv_make_absolute_cwd(res);
328 if (r < 0)
329 return r;
330
331 *ret = TAKE_PTR(res);
332 return 0;
333 }
334
335 static bool needs_glob(ItemType t) {
336 return IN_SET(t,
337 WRITE_FILE,
338 IGNORE_PATH,
339 IGNORE_DIRECTORY_PATH,
340 REMOVE_PATH,
341 RECURSIVE_REMOVE_PATH,
342 EMPTY_DIRECTORY,
343 ADJUST_MODE,
344 RELABEL_PATH,
345 RECURSIVE_RELABEL_PATH,
346 SET_XATTR,
347 RECURSIVE_SET_XATTR,
348 SET_ACL,
349 RECURSIVE_SET_ACL,
350 SET_ATTRIBUTE,
351 RECURSIVE_SET_ATTRIBUTE);
352 }
353
354 static bool takes_ownership(ItemType t) {
355 return IN_SET(t,
356 CREATE_FILE,
357 TRUNCATE_FILE,
358 CREATE_DIRECTORY,
359 EMPTY_DIRECTORY,
360 TRUNCATE_DIRECTORY,
361 CREATE_SUBVOLUME,
362 CREATE_SUBVOLUME_INHERIT_QUOTA,
363 CREATE_SUBVOLUME_NEW_QUOTA,
364 CREATE_FIFO,
365 CREATE_SYMLINK,
366 CREATE_CHAR_DEVICE,
367 CREATE_BLOCK_DEVICE,
368 COPY_FILES,
369 WRITE_FILE,
370 IGNORE_PATH,
371 IGNORE_DIRECTORY_PATH,
372 REMOVE_PATH,
373 RECURSIVE_REMOVE_PATH);
374 }
375
376 static struct Item* find_glob(OrderedHashmap *h, const char *match) {
377 ItemArray *j;
378
379 ORDERED_HASHMAP_FOREACH(j, h) {
380 size_t n;
381
382 for (n = 0; n < j->n_items; n++) {
383 Item *item = j->items + n;
384
385 if (fnmatch(item->path, match, FNM_PATHNAME|FNM_PERIOD) == 0)
386 return item;
387 }
388 }
389
390 return NULL;
391 }
392
393 static int load_unix_sockets(void) {
394 _cleanup_set_free_free_ Set *sockets = NULL;
395 _cleanup_fclose_ FILE *f = NULL;
396 int r;
397
398 if (unix_sockets)
399 return 0;
400
401 /* We maintain a cache of the sockets we found in /proc/net/unix to speed things up a little. */
402
403 sockets = set_new(&path_hash_ops);
404 if (!sockets)
405 return log_oom();
406
407 f = fopen("/proc/net/unix", "re");
408 if (!f)
409 return log_full_errno(errno == ENOENT ? LOG_DEBUG : LOG_WARNING, errno,
410 "Failed to open /proc/net/unix, ignoring: %m");
411
412 /* Skip header */
413 r = read_line(f, LONG_LINE_MAX, NULL);
414 if (r < 0)
415 return log_warning_errno(r, "Failed to skip /proc/net/unix header line: %m");
416 if (r == 0)
417 return log_warning_errno(SYNTHETIC_ERRNO(EIO), "Premature end of file reading /proc/net/unix.");
418
419 for (;;) {
420 _cleanup_free_ char *line = NULL, *s = NULL;
421 char *p;
422
423 r = read_line(f, LONG_LINE_MAX, &line);
424 if (r < 0)
425 return log_warning_errno(r, "Failed to read /proc/net/unix line, ignoring: %m");
426 if (r == 0) /* EOF */
427 break;
428
429 p = strchr(line, ':');
430 if (!p)
431 continue;
432
433 if (strlen(p) < 37)
434 continue;
435
436 p += 37;
437 p += strspn(p, WHITESPACE);
438 p += strcspn(p, WHITESPACE); /* skip one more word */
439 p += strspn(p, WHITESPACE);
440
441 if (*p != '/')
442 continue;
443
444 s = strdup(p);
445 if (!s)
446 return log_oom();
447
448 path_simplify(s);
449
450 r = set_consume(sockets, s);
451 if (r == -EEXIST)
452 continue;
453 if (r < 0)
454 return log_warning_errno(r, "Failed to add AF_UNIX socket to set, ignoring: %m");
455
456 TAKE_PTR(s);
457 }
458
459 unix_sockets = TAKE_PTR(sockets);
460 return 1;
461 }
462
463 static bool unix_socket_alive(const char *fn) {
464 assert(fn);
465
466 if (load_unix_sockets() < 0)
467 return true; /* We don't know, so assume yes */
468
469 return !!set_get(unix_sockets, (char*) fn);
470 }
471
472 static DIR* xopendirat_nomod(int dirfd, const char *path) {
473 DIR *dir;
474
475 dir = xopendirat(dirfd, path, O_NOFOLLOW|O_NOATIME);
476 if (dir)
477 return dir;
478
479 log_debug_errno(errno, "Cannot open %sdirectory \"%s\": %m", dirfd == AT_FDCWD ? "" : "sub", path);
480 if (errno != EPERM)
481 return NULL;
482
483 dir = xopendirat(dirfd, path, O_NOFOLLOW);
484 if (!dir)
485 log_debug_errno(errno, "Cannot open %sdirectory \"%s\": %m", dirfd == AT_FDCWD ? "" : "sub", path);
486
487 return dir;
488 }
489
490 static DIR* opendir_nomod(const char *path) {
491 return xopendirat_nomod(AT_FDCWD, path);
492 }
493
494 static inline nsec_t load_statx_timestamp_nsec(const struct statx_timestamp *ts) {
495 assert(ts);
496
497 if (ts->tv_sec < 0)
498 return NSEC_INFINITY;
499
500 if ((nsec_t) ts->tv_sec >= (UINT64_MAX - ts->tv_nsec) / NSEC_PER_SEC)
501 return NSEC_INFINITY;
502
503 return ts->tv_sec * NSEC_PER_SEC + ts->tv_nsec;
504 }
505
506 static int dir_cleanup(
507 Item *i,
508 const char *p,
509 DIR *d,
510 nsec_t self_atime_nsec,
511 nsec_t self_mtime_nsec,
512 nsec_t cutoff_nsec,
513 dev_t rootdev_major,
514 dev_t rootdev_minor,
515 bool mountpoint,
516 int maxdepth,
517 bool keep_this_level) {
518
519 bool deleted = false;
520 struct dirent *dent;
521 int r = 0;
522
523 FOREACH_DIRENT_ALL(dent, d, break) {
524 _cleanup_free_ char *sub_path = NULL;
525 nsec_t atime_nsec, mtime_nsec, ctime_nsec, btime_nsec;
526
527 if (dot_or_dot_dot(dent->d_name))
528 continue;
529
530 /* If statx() is supported, use it. It's preferable over fstatat() since it tells us
531 * explicitly where we are looking at a mount point, for free as side information. Determining
532 * the same information without statx() is hard, see the complexity of path_is_mount_point(),
533 * and also much slower as it requires a number of syscalls instead of just one. Hence, when
534 * we have modern statx() we use it instead of fstat() and do proper mount point checks,
535 * while on older kernels's well do traditional st_dev based detection of mount points.
536 *
537 * Using statx() for detecting mount points also has the benfit that we handle weird file
538 * systems such as overlayfs better where each file is originating from a different
539 * st_dev. */
540
541 STRUCT_STATX_DEFINE(sx);
542
543 r = statx_fallback(
544 dirfd(d), dent->d_name,
545 AT_SYMLINK_NOFOLLOW|AT_NO_AUTOMOUNT,
546 STATX_TYPE|STATX_MODE|STATX_UID|STATX_ATIME|STATX_MTIME|STATX_CTIME|STATX_BTIME,
547 &sx);
548 if (r == -ENOENT)
549 continue;
550 if (r < 0) {
551 /* FUSE, NFS mounts, SELinux might return EACCES */
552 r = log_full_errno(errno == EACCES ? LOG_DEBUG : LOG_ERR, errno,
553 "statx(%s/%s) failed: %m", p, dent->d_name);
554 continue;
555 }
556
557 if (FLAGS_SET(sx.stx_attributes_mask, STATX_ATTR_MOUNT_ROOT)) {
558 /* Yay, we have the mount point API, use it */
559 if (FLAGS_SET(sx.stx_attributes, STATX_ATTR_MOUNT_ROOT)) {
560 log_debug("Ignoring \"%s/%s\": different mount points.", p, dent->d_name);
561 continue;
562 }
563 } else {
564 /* So we might have statx() but the STATX_ATTR_MOUNT_ROOT flag is not supported, fall
565 * back to traditional stx_dev checking. */
566 if (sx.stx_dev_major != rootdev_major ||
567 sx.stx_dev_minor != rootdev_minor) {
568 log_debug("Ignoring \"%s/%s\": different filesystem.", p, dent->d_name);
569 continue;
570 }
571
572 /* Try to detect bind mounts of the same filesystem instance; they do not differ in device
573 * major/minors. This type of query is not supported on all kernels or filesystem types
574 * though. */
575 if (S_ISDIR(sx.stx_mode)) {
576 int q;
577
578 q = fd_is_mount_point(dirfd(d), dent->d_name, 0);
579 if (q < 0)
580 log_debug_errno(q, "Failed to determine whether \"%s/%s\" is a mount point, ignoring: %m", p, dent->d_name);
581 else if (q > 0) {
582 log_debug("Ignoring \"%s/%s\": different mount of the same filesystem.", p, dent->d_name);
583 continue;
584 }
585 }
586 }
587
588 atime_nsec = FLAGS_SET(sx.stx_mask, STATX_ATIME) ? load_statx_timestamp_nsec(&sx.stx_atime) : 0;
589 mtime_nsec = FLAGS_SET(sx.stx_mask, STATX_MTIME) ? load_statx_timestamp_nsec(&sx.stx_mtime) : 0;
590 ctime_nsec = FLAGS_SET(sx.stx_mask, STATX_CTIME) ? load_statx_timestamp_nsec(&sx.stx_ctime) : 0;
591 btime_nsec = FLAGS_SET(sx.stx_mask, STATX_BTIME) ? load_statx_timestamp_nsec(&sx.stx_btime) : 0;
592
593 sub_path = path_join(p, dent->d_name);
594 if (!sub_path) {
595 r = log_oom();
596 goto finish;
597 }
598
599 /* Is there an item configured for this path? */
600 if (ordered_hashmap_get(items, sub_path)) {
601 log_debug("Ignoring \"%s\": a separate entry exists.", sub_path);
602 continue;
603 }
604
605 if (find_glob(globs, sub_path)) {
606 log_debug("Ignoring \"%s\": a separate glob exists.", sub_path);
607 continue;
608 }
609
610 if (S_ISDIR(sx.stx_mode)) {
611 _cleanup_closedir_ DIR *sub_dir = NULL;
612
613 if (mountpoint &&
614 streq(dent->d_name, "lost+found") &&
615 sx.stx_uid == 0) {
616 log_debug("Ignoring directory \"%s\".", sub_path);
617 continue;
618 }
619
620 if (maxdepth <= 0)
621 log_warning("Reached max depth on \"%s\".", sub_path);
622 else {
623 int q;
624
625 sub_dir = xopendirat_nomod(dirfd(d), dent->d_name);
626 if (!sub_dir) {
627 if (errno != ENOENT)
628 r = log_warning_errno(errno, "Opening directory \"%s\" failed, ignoring: %m", sub_path);
629
630 continue;
631 }
632
633 if (flock(dirfd(sub_dir), LOCK_EX|LOCK_NB) < 0) {
634 log_debug_errno(errno, "Couldn't acquire shared BSD lock on directory \"%s\", skipping: %m", p);
635 continue;
636 }
637
638 q = dir_cleanup(i,
639 sub_path, sub_dir,
640 atime_nsec, mtime_nsec, cutoff_nsec,
641 rootdev_major, rootdev_minor,
642 false, maxdepth-1, false);
643 if (q < 0)
644 r = q;
645 }
646
647 /* Note: if you are wondering why we don't support the sticky bit for excluding
648 * directories from cleaning like we do it for other file system objects: well, the
649 * sticky bit already has a meaning for directories, so we don't want to overload
650 * that. */
651
652 if (keep_this_level) {
653 log_debug("Keeping directory \"%s\".", sub_path);
654 continue;
655 }
656
657 /* Ignore ctime, we change it when deleting */
658 if (mtime_nsec != NSEC_INFINITY && mtime_nsec >= cutoff_nsec) {
659 char a[FORMAT_TIMESTAMP_MAX];
660 /* Follows spelling in stat(1). */
661 log_debug("Directory \"%s\": modify time %s is too new.",
662 sub_path,
663 format_timestamp_style(a, sizeof(a), mtime_nsec / NSEC_PER_USEC, TIMESTAMP_US));
664 continue;
665 }
666
667 if (atime_nsec != NSEC_INFINITY && atime_nsec >= cutoff_nsec) {
668 char a[FORMAT_TIMESTAMP_MAX];
669 log_debug("Directory \"%s\": access time %s is too new.",
670 sub_path,
671 format_timestamp_style(a, sizeof(a), atime_nsec / NSEC_PER_USEC, TIMESTAMP_US));
672 continue;
673 }
674
675 if (btime_nsec != NSEC_INFINITY && btime_nsec >= cutoff_nsec) {
676 char a[FORMAT_TIMESTAMP_MAX];
677 log_debug("Directory \"%s\": birth time %s is too new.",
678 sub_path,
679 format_timestamp_style(a, sizeof(a), btime_nsec / NSEC_PER_USEC, TIMESTAMP_US));
680 continue;
681 }
682
683 log_debug("Removing directory \"%s\".", sub_path);
684 if (unlinkat(dirfd(d), dent->d_name, AT_REMOVEDIR) < 0)
685 if (!IN_SET(errno, ENOENT, ENOTEMPTY))
686 r = log_warning_errno(errno, "Failed to remove directory \"%s\", ignoring: %m", sub_path);
687
688 } else {
689 /* Skip files for which the sticky bit is set. These are semantics we define, and are
690 * unknown elsewhere. See XDG_RUNTIME_DIR specification for details. */
691 if (sx.stx_mode & S_ISVTX) {
692 log_debug("Skipping \"%s\": sticky bit set.", sub_path);
693 continue;
694 }
695
696 if (mountpoint &&
697 S_ISREG(sx.stx_mode) &&
698 sx.stx_uid == 0 &&
699 STR_IN_SET(dent->d_name,
700 ".journal",
701 "aquota.user",
702 "aquota.group")) {
703 log_debug("Skipping \"%s\".", sub_path);
704 continue;
705 }
706
707 /* Ignore sockets that are listed in /proc/net/unix */
708 if (S_ISSOCK(sx.stx_mode) && unix_socket_alive(sub_path)) {
709 log_debug("Skipping \"%s\": live socket.", sub_path);
710 continue;
711 }
712
713 /* Ignore device nodes */
714 if (S_ISCHR(sx.stx_mode) || S_ISBLK(sx.stx_mode)) {
715 log_debug("Skipping \"%s\": a device.", sub_path);
716 continue;
717 }
718
719 /* Keep files on this level around if this is requested */
720 if (keep_this_level) {
721 log_debug("Keeping \"%s\".", sub_path);
722 continue;
723 }
724
725 if (mtime_nsec != NSEC_INFINITY && mtime_nsec >= cutoff_nsec) {
726 char a[FORMAT_TIMESTAMP_MAX];
727 /* Follows spelling in stat(1). */
728 log_debug("File \"%s\": modify time %s is too new.",
729 sub_path,
730 format_timestamp_style(a, sizeof(a), mtime_nsec / NSEC_PER_USEC, TIMESTAMP_US));
731 continue;
732 }
733
734 if (atime_nsec != NSEC_INFINITY && atime_nsec >= cutoff_nsec) {
735 char a[FORMAT_TIMESTAMP_MAX];
736 log_debug("File \"%s\": access time %s is too new.",
737 sub_path,
738 format_timestamp_style(a, sizeof(a), atime_nsec / NSEC_PER_USEC, TIMESTAMP_US));
739 continue;
740 }
741
742 if (ctime_nsec != NSEC_INFINITY && ctime_nsec >= cutoff_nsec) {
743 char a[FORMAT_TIMESTAMP_MAX];
744 log_debug("File \"%s\": change time %s is too new.",
745 sub_path,
746 format_timestamp_style(a, sizeof(a), ctime_nsec / NSEC_PER_USEC, TIMESTAMP_US));
747 continue;
748 }
749
750 if (btime_nsec != NSEC_INFINITY && btime_nsec >= cutoff_nsec) {
751 char a[FORMAT_TIMESTAMP_MAX];
752 log_debug("File \"%s\": birth time %s is too new.",
753 sub_path,
754 format_timestamp_style(a, sizeof(a), btime_nsec / NSEC_PER_USEC, TIMESTAMP_US));
755 continue;
756 }
757
758 log_debug("Removing \"%s\".", sub_path);
759 if (unlinkat(dirfd(d), dent->d_name, 0) < 0)
760 if (errno != ENOENT)
761 r = log_warning_errno(errno, "Failed to remove \"%s\", ignoring: %m", sub_path);
762
763 deleted = true;
764 }
765 }
766
767 finish:
768 if (deleted) {
769 char a[FORMAT_TIMESTAMP_MAX], m[FORMAT_TIMESTAMP_MAX];
770 struct timespec ts[2];
771
772 log_debug("Restoring access and modification time on \"%s\": %s, %s",
773 p,
774 format_timestamp_style(a, sizeof(a), self_atime_nsec / NSEC_PER_USEC, TIMESTAMP_US),
775 format_timestamp_style(m, sizeof(m), self_mtime_nsec / NSEC_PER_USEC, TIMESTAMP_US));
776
777 timespec_store_nsec(ts + 0, self_atime_nsec);
778 timespec_store_nsec(ts + 1, self_mtime_nsec);
779
780 /* Restore original directory timestamps */
781 if (futimens(dirfd(d), ts) < 0)
782 log_warning_errno(errno, "Failed to revert timestamps of '%s', ignoring: %m", p);
783 }
784
785 return r;
786 }
787
788 static bool dangerous_hardlinks(void) {
789 _cleanup_free_ char *value = NULL;
790 static int cached = -1;
791 int r;
792
793 /* Check whether the fs.protected_hardlinks sysctl is on. If we can't determine it we assume its off, as that's
794 * what the upstream default is. */
795
796 if (cached >= 0)
797 return cached;
798
799 r = read_one_line_file("/proc/sys/fs/protected_hardlinks", &value);
800 if (r < 0) {
801 log_debug_errno(r, "Failed to read fs.protected_hardlinks sysctl: %m");
802 return true;
803 }
804
805 r = parse_boolean(value);
806 if (r < 0) {
807 log_debug_errno(r, "Failed to parse fs.protected_hardlinks sysctl: %m");
808 return true;
809 }
810
811 cached = r == 0;
812 return cached;
813 }
814
815 static bool hardlink_vulnerable(const struct stat *st) {
816 assert(st);
817
818 return !S_ISDIR(st->st_mode) && st->st_nlink > 1 && dangerous_hardlinks();
819 }
820
821 static mode_t process_mask_perms(mode_t mode, mode_t current) {
822
823 if ((current & 0111) == 0)
824 mode &= ~0111;
825 if ((current & 0222) == 0)
826 mode &= ~0222;
827 if ((current & 0444) == 0)
828 mode &= ~0444;
829 if (!S_ISDIR(current))
830 mode &= ~07000; /* remove sticky/sgid/suid bit, unless directory */
831
832 return mode;
833 }
834
835 static int fd_set_perms(Item *i, int fd, const char *path, const struct stat *st) {
836 struct stat stbuf;
837 mode_t new_mode;
838 bool do_chown;
839 int r;
840
841 assert(i);
842 assert(fd);
843 assert(path);
844
845 if (!i->mode_set && !i->uid_set && !i->gid_set)
846 goto shortcut;
847
848 if (!st) {
849 if (fstat(fd, &stbuf) < 0)
850 return log_error_errno(errno, "fstat(%s) failed: %m", path);
851 st = &stbuf;
852 }
853
854 if (hardlink_vulnerable(st))
855 return log_error_errno(SYNTHETIC_ERRNO(EPERM),
856 "Refusing to set permissions on hardlinked file %s while the fs.protected_hardlinks sysctl is turned off.",
857 path);
858
859 /* Do we need a chown()? */
860 do_chown =
861 (i->uid_set && i->uid != st->st_uid) ||
862 (i->gid_set && i->gid != st->st_gid);
863
864 /* Calculate the mode to apply */
865 new_mode = i->mode_set ? (i->mask_perms ?
866 process_mask_perms(i->mode, st->st_mode) :
867 i->mode) :
868 (st->st_mode & 07777);
869
870 if (i->mode_set && do_chown) {
871 /* Before we issue the chmod() let's reduce the access mode to the common bits of the old and
872 * the new mode. That way there's no time window where the file exists under the old owner
873 * with more than the old access modes — and not under the new owner with more than the new
874 * access modes either. */
875
876 if (S_ISLNK(st->st_mode))
877 log_debug("Skipping temporary mode fix for symlink %s.", path);
878 else {
879 mode_t m = new_mode & st->st_mode; /* Mask new mode by old mode */
880
881 if (((m ^ st->st_mode) & 07777) == 0)
882 log_debug("\"%s\" matches temporary mode %o already.", path, m);
883 else {
884 log_debug("Temporarily changing \"%s\" to mode %o.", path, m);
885 r = fchmod_opath(fd, m);
886 if (r < 0)
887 return log_error_errno(r, "fchmod() of %s failed: %m", path);
888 }
889 }
890 }
891
892 if (do_chown) {
893 log_debug("Changing \"%s\" to owner "UID_FMT":"GID_FMT,
894 path,
895 i->uid_set ? i->uid : UID_INVALID,
896 i->gid_set ? i->gid : GID_INVALID);
897
898 if (fchownat(fd,
899 "",
900 i->uid_set ? i->uid : UID_INVALID,
901 i->gid_set ? i->gid : GID_INVALID,
902 AT_EMPTY_PATH) < 0)
903 return log_error_errno(errno, "fchownat() of %s failed: %m", path);
904 }
905
906 /* Now, apply the final mode. We do this in two cases: when the user set a mode explicitly, or after a
907 * chown(), since chown()'s mangle the access mode in regards to sgid/suid in some conditions. */
908 if (i->mode_set || do_chown) {
909 if (S_ISLNK(st->st_mode))
910 log_debug("Skipping mode fix for symlink %s.", path);
911 else {
912 /* Check if the chmod() is unnecessary. Note that if we did a chown() before we always
913 * chmod() here again, since it might have mangled the bits. */
914 if (!do_chown && ((new_mode ^ st->st_mode) & 07777) == 0)
915 log_debug("\"%s\" matches mode %o already.", path, new_mode);
916 else {
917 log_debug("Changing \"%s\" to mode %o.", path, new_mode);
918 r = fchmod_opath(fd, new_mode);
919 if (r < 0)
920 return log_error_errno(r, "fchmod() of %s failed: %m", path);
921 }
922 }
923 }
924
925 shortcut:
926 return label_fix(path, 0);
927 }
928
929 static int path_open_parent_safe(const char *path) {
930 _cleanup_free_ char *dn = NULL;
931 int r, fd;
932
933 if (path_equal(path, "/") || !path_is_normalized(path))
934 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
935 "Failed to open parent of '%s': invalid path.",
936 path);
937
938 dn = dirname_malloc(path);
939 if (!dn)
940 return log_oom();
941
942 r = chase_symlinks(dn, arg_root, CHASE_SAFE|CHASE_WARN, NULL, &fd);
943 if (r < 0 && r != -ENOLINK)
944 return log_error_errno(r, "Failed to validate path %s: %m", path);
945
946 return r < 0 ? r : fd;
947 }
948
949 static int path_open_safe(const char *path) {
950 int r, fd;
951
952 /* path_open_safe() returns a file descriptor opened with O_PATH after
953 * verifying that the path doesn't contain unsafe transitions, except
954 * for its final component as the function does not follow symlink. */
955
956 assert(path);
957
958 if (!path_is_normalized(path))
959 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
960 "Failed to open invalid path '%s'.",
961 path);
962
963 r = chase_symlinks(path, arg_root, CHASE_SAFE|CHASE_WARN|CHASE_NOFOLLOW, NULL, &fd);
964 if (r < 0 && r != -ENOLINK)
965 return log_error_errno(r, "Failed to validate path %s: %m", path);
966
967 return r < 0 ? r : fd;
968 }
969
970 static int path_set_perms(Item *i, const char *path) {
971 _cleanup_close_ int fd = -1;
972
973 assert(i);
974 assert(path);
975
976 fd = path_open_safe(path);
977 if (fd < 0)
978 return fd;
979
980 return fd_set_perms(i, fd, path, NULL);
981 }
982
983 static int parse_xattrs_from_arg(Item *i) {
984 const char *p;
985 int r;
986
987 assert(i);
988 assert(i->argument);
989
990 p = i->argument;
991
992 for (;;) {
993 _cleanup_free_ char *name = NULL, *value = NULL, *xattr = NULL;
994
995 r = extract_first_word(&p, &xattr, NULL, EXTRACT_UNQUOTE|EXTRACT_CUNESCAPE);
996 if (r < 0)
997 log_warning_errno(r, "Failed to parse extended attribute '%s', ignoring: %m", p);
998 if (r <= 0)
999 break;
1000
1001 r = split_pair(xattr, "=", &name, &value);
1002 if (r < 0) {
1003 log_warning_errno(r, "Failed to parse extended attribute, ignoring: %s", xattr);
1004 continue;
1005 }
1006
1007 if (isempty(name) || isempty(value)) {
1008 log_warning("Malformed extended attribute found, ignoring: %s", xattr);
1009 continue;
1010 }
1011
1012 if (strv_push_pair(&i->xattrs, name, value) < 0)
1013 return log_oom();
1014
1015 name = value = NULL;
1016 }
1017
1018 return 0;
1019 }
1020
1021 static int fd_set_xattrs(Item *i, int fd, const char *path, const struct stat *st) {
1022 char procfs_path[STRLEN("/proc/self/fd/") + DECIMAL_STR_MAX(int)];
1023 char **name, **value;
1024
1025 assert(i);
1026 assert(fd);
1027 assert(path);
1028
1029 xsprintf(procfs_path, "/proc/self/fd/%i", fd);
1030
1031 STRV_FOREACH_PAIR(name, value, i->xattrs) {
1032 log_debug("Setting extended attribute '%s=%s' on %s.", *name, *value, path);
1033 if (setxattr(procfs_path, *name, *value, strlen(*value), 0) < 0)
1034 return log_error_errno(errno, "Setting extended attribute %s=%s on %s failed: %m",
1035 *name, *value, path);
1036 }
1037 return 0;
1038 }
1039
1040 static int path_set_xattrs(Item *i, const char *path) {
1041 _cleanup_close_ int fd = -1;
1042
1043 assert(i);
1044 assert(path);
1045
1046 fd = path_open_safe(path);
1047 if (fd < 0)
1048 return fd;
1049
1050 return fd_set_xattrs(i, fd, path, NULL);
1051 }
1052
1053 static int parse_acls_from_arg(Item *item) {
1054 #if HAVE_ACL
1055 int r;
1056
1057 assert(item);
1058
1059 /* If append_or_force (= modify) is set, we will not modify the acl
1060 * afterwards, so the mask can be added now if necessary. */
1061
1062 r = parse_acl(item->argument, &item->acl_access, &item->acl_default, !item->append_or_force);
1063 if (r < 0)
1064 log_warning_errno(r, "Failed to parse ACL \"%s\": %m. Ignoring", item->argument);
1065 #else
1066 log_warning("ACLs are not supported. Ignoring.");
1067 #endif
1068
1069 return 0;
1070 }
1071
1072 #if HAVE_ACL
1073 static int path_set_acl(const char *path, const char *pretty, acl_type_t type, acl_t acl, bool modify) {
1074 _cleanup_(acl_free_charpp) char *t = NULL;
1075 _cleanup_(acl_freep) acl_t dup = NULL;
1076 int r;
1077
1078 /* Returns 0 for success, positive error if already warned,
1079 * negative error otherwise. */
1080
1081 if (modify) {
1082 r = acls_for_file(path, type, acl, &dup);
1083 if (r < 0)
1084 return r;
1085
1086 r = calc_acl_mask_if_needed(&dup);
1087 if (r < 0)
1088 return r;
1089 } else {
1090 dup = acl_dup(acl);
1091 if (!dup)
1092 return -errno;
1093
1094 /* the mask was already added earlier if needed */
1095 }
1096
1097 r = add_base_acls_if_needed(&dup, path);
1098 if (r < 0)
1099 return r;
1100
1101 t = acl_to_any_text(dup, NULL, ',', TEXT_ABBREVIATE);
1102 log_debug("Setting %s ACL %s on %s.",
1103 type == ACL_TYPE_ACCESS ? "access" : "default",
1104 strna(t), pretty);
1105
1106 r = acl_set_file(path, type, dup);
1107 if (r < 0) {
1108 if (ERRNO_IS_NOT_SUPPORTED(errno))
1109 /* No error if filesystem doesn't support ACLs. Return negative. */
1110 return -errno;
1111 else
1112 /* Return positive to indicate we already warned */
1113 return -log_error_errno(errno,
1114 "Setting %s ACL \"%s\" on %s failed: %m",
1115 type == ACL_TYPE_ACCESS ? "access" : "default",
1116 strna(t), pretty);
1117 }
1118 return 0;
1119 }
1120 #endif
1121
1122 static int fd_set_acls(Item *item, int fd, const char *path, const struct stat *st) {
1123 int r = 0;
1124 #if HAVE_ACL
1125 char procfs_path[STRLEN("/proc/self/fd/") + DECIMAL_STR_MAX(int)];
1126 struct stat stbuf;
1127
1128 assert(item);
1129 assert(fd);
1130 assert(path);
1131
1132 if (!st) {
1133 if (fstat(fd, &stbuf) < 0)
1134 return log_error_errno(errno, "fstat(%s) failed: %m", path);
1135 st = &stbuf;
1136 }
1137
1138 if (hardlink_vulnerable(st))
1139 return log_error_errno(SYNTHETIC_ERRNO(EPERM),
1140 "Refusing to set ACLs on hardlinked file %s while the fs.protected_hardlinks sysctl is turned off.",
1141 path);
1142
1143 if (S_ISLNK(st->st_mode)) {
1144 log_debug("Skipping ACL fix for symlink %s.", path);
1145 return 0;
1146 }
1147
1148 xsprintf(procfs_path, "/proc/self/fd/%i", fd);
1149
1150 if (item->acl_access)
1151 r = path_set_acl(procfs_path, path, ACL_TYPE_ACCESS, item->acl_access, item->append_or_force);
1152
1153 /* set only default acls to folders */
1154 if (r == 0 && item->acl_default && S_ISDIR(st->st_mode))
1155 r = path_set_acl(procfs_path, path, ACL_TYPE_DEFAULT, item->acl_default, item->append_or_force);
1156
1157 if (ERRNO_IS_NOT_SUPPORTED(r)) {
1158 log_debug_errno(r, "ACLs not supported by file system at %s", path);
1159 return 0;
1160 }
1161
1162 if (r > 0)
1163 return -r; /* already warned */
1164
1165 /* The above procfs paths don't work if /proc is not mounted. */
1166 if (r == -ENOENT && proc_mounted() == 0)
1167 r = -ENOSYS;
1168
1169 if (r < 0)
1170 return log_error_errno(r, "ACL operation on \"%s\" failed: %m", path);
1171 #endif
1172 return r;
1173 }
1174
1175 static int path_set_acls(Item *item, const char *path) {
1176 int r = 0;
1177 #if HAVE_ACL
1178 _cleanup_close_ int fd = -1;
1179
1180 assert(item);
1181 assert(path);
1182
1183 fd = path_open_safe(path);
1184 if (fd < 0)
1185 return fd;
1186
1187 r = fd_set_acls(item, fd, path, NULL);
1188 #endif
1189 return r;
1190 }
1191
1192 static int parse_attribute_from_arg(Item *item) {
1193
1194 static const struct {
1195 char character;
1196 unsigned value;
1197 } attributes[] = {
1198 { 'A', FS_NOATIME_FL }, /* do not update atime */
1199 { 'S', FS_SYNC_FL }, /* Synchronous updates */
1200 { 'D', FS_DIRSYNC_FL }, /* dirsync behaviour (directories only) */
1201 { 'a', FS_APPEND_FL }, /* writes to file may only append */
1202 { 'c', FS_COMPR_FL }, /* Compress file */
1203 { 'd', FS_NODUMP_FL }, /* do not dump file */
1204 { 'e', FS_EXTENT_FL }, /* Extents */
1205 { 'i', FS_IMMUTABLE_FL }, /* Immutable file */
1206 { 'j', FS_JOURNAL_DATA_FL }, /* Reserved for ext3 */
1207 { 's', FS_SECRM_FL }, /* Secure deletion */
1208 { 'u', FS_UNRM_FL }, /* Undelete */
1209 { 't', FS_NOTAIL_FL }, /* file tail should not be merged */
1210 { 'T', FS_TOPDIR_FL }, /* Top of directory hierarchies */
1211 { 'C', FS_NOCOW_FL }, /* Do not cow file */
1212 { 'P', FS_PROJINHERIT_FL }, /* Inherit the quota project ID */
1213 };
1214
1215 enum {
1216 MODE_ADD,
1217 MODE_DEL,
1218 MODE_SET
1219 } mode = MODE_ADD;
1220
1221 unsigned value = 0, mask = 0;
1222 const char *p;
1223
1224 assert(item);
1225
1226 p = item->argument;
1227 if (p) {
1228 if (*p == '+') {
1229 mode = MODE_ADD;
1230 p++;
1231 } else if (*p == '-') {
1232 mode = MODE_DEL;
1233 p++;
1234 } else if (*p == '=') {
1235 mode = MODE_SET;
1236 p++;
1237 }
1238 }
1239
1240 if (isempty(p) && mode != MODE_SET)
1241 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
1242 "Setting file attribute on '%s' needs an attribute specification.",
1243 item->path);
1244
1245 for (; p && *p ; p++) {
1246 unsigned i, v;
1247
1248 for (i = 0; i < ELEMENTSOF(attributes); i++)
1249 if (*p == attributes[i].character)
1250 break;
1251
1252 if (i >= ELEMENTSOF(attributes))
1253 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
1254 "Unknown file attribute '%c' on '%s'.",
1255 *p, item->path);
1256
1257 v = attributes[i].value;
1258
1259 SET_FLAG(value, v, IN_SET(mode, MODE_ADD, MODE_SET));
1260
1261 mask |= v;
1262 }
1263
1264 if (mode == MODE_SET)
1265 mask |= CHATTR_ALL_FL;
1266
1267 assert(mask != 0);
1268
1269 item->attribute_mask = mask;
1270 item->attribute_value = value;
1271 item->attribute_set = true;
1272
1273 return 0;
1274 }
1275
1276 static int fd_set_attribute(Item *item, int fd, const char *path, const struct stat *st) {
1277 _cleanup_close_ int procfs_fd = -1;
1278 struct stat stbuf;
1279 unsigned f;
1280 int r;
1281
1282 assert(item);
1283 assert(fd);
1284 assert(path);
1285
1286 if (!item->attribute_set || item->attribute_mask == 0)
1287 return 0;
1288
1289 if (!st) {
1290 if (fstat(fd, &stbuf) < 0)
1291 return log_error_errno(errno, "fstat(%s) failed: %m", path);
1292 st = &stbuf;
1293 }
1294
1295 /* Issuing the file attribute ioctls on device nodes is not
1296 * safe, as that will be delivered to the drivers, not the
1297 * file system containing the device node. */
1298 if (!S_ISREG(st->st_mode) && !S_ISDIR(st->st_mode))
1299 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
1300 "Setting file flags is only supported on regular files and directories, cannot set on '%s'.",
1301 path);
1302
1303 f = item->attribute_value & item->attribute_mask;
1304
1305 /* Mask away directory-specific flags */
1306 if (!S_ISDIR(st->st_mode))
1307 f &= ~FS_DIRSYNC_FL;
1308
1309 procfs_fd = fd_reopen(fd, O_RDONLY|O_CLOEXEC|O_NOATIME);
1310 if (procfs_fd < 0)
1311 return log_error_errno(procfs_fd, "Failed to re-open '%s': %m", path);
1312
1313 unsigned previous, current;
1314 r = chattr_full(NULL, procfs_fd, f, item->attribute_mask, &previous, &current, true);
1315 if (r == -ENOANO)
1316 log_warning("Cannot set file attributes for '%s', maybe due to incompatibility in specified attributes, "
1317 "previous=0x%08x, current=0x%08x, expected=0x%08x, ignoring.",
1318 path, previous, current, (previous & ~item->attribute_mask) | (f & item->attribute_mask));
1319 else if (r < 0)
1320 log_full_errno(ERRNO_IS_NOT_SUPPORTED(r) ? LOG_DEBUG : LOG_WARNING, r,
1321 "Cannot set file attributes for '%s', value=0x%08x, mask=0x%08x, ignoring: %m",
1322 path, item->attribute_value, item->attribute_mask);
1323
1324 return 0;
1325 }
1326
1327 static int path_set_attribute(Item *item, const char *path) {
1328 _cleanup_close_ int fd = -1;
1329
1330 if (!item->attribute_set || item->attribute_mask == 0)
1331 return 0;
1332
1333 fd = path_open_safe(path);
1334 if (fd < 0)
1335 return fd;
1336
1337 return fd_set_attribute(item, fd, path, NULL);
1338 }
1339
1340 static int write_one_file(Item *i, const char *path) {
1341 _cleanup_close_ int fd = -1, dir_fd = -1;
1342 char *bn;
1343 int r;
1344
1345 assert(i);
1346 assert(path);
1347 assert(i->argument);
1348 assert(i->type == WRITE_FILE);
1349
1350 /* Validate the path and keep the fd on the directory for opening the
1351 * file so we're sure that it can't be changed behind our back. */
1352 dir_fd = path_open_parent_safe(path);
1353 if (dir_fd < 0)
1354 return dir_fd;
1355
1356 bn = basename(path);
1357
1358 /* Follows symlinks */
1359 fd = openat(dir_fd, bn,
1360 O_NONBLOCK|O_CLOEXEC|O_WRONLY|O_NOCTTY|(i->append_or_force ? O_APPEND : 0),
1361 i->mode);
1362 if (fd < 0) {
1363 if (errno == ENOENT) {
1364 log_debug_errno(errno, "Not writing missing file \"%s\": %m", path);
1365 return 0;
1366 }
1367
1368 if (i->allow_failure)
1369 return log_debug_errno(errno, "Failed to open file \"%s\", ignoring: %m", path);
1370
1371 return log_error_errno(errno, "Failed to open file \"%s\": %m", path);
1372 }
1373
1374 /* 'w' is allowed to write into any kind of files. */
1375 log_debug("Writing to \"%s\".", path);
1376
1377 r = loop_write(fd, i->argument, strlen(i->argument), false);
1378 if (r < 0)
1379 return log_error_errno(r, "Failed to write file \"%s\": %m", path);
1380
1381 return fd_set_perms(i, fd, path, NULL);
1382 }
1383
1384 static int create_file(Item *i, const char *path) {
1385 _cleanup_close_ int fd = -1, dir_fd = -1;
1386 struct stat stbuf, *st = NULL;
1387 int r = 0;
1388 char *bn;
1389
1390 assert(i);
1391 assert(path);
1392 assert(i->type == CREATE_FILE);
1393
1394 /* 'f' operates on regular files exclusively. */
1395
1396 /* Validate the path and keep the fd on the directory for opening the
1397 * file so we're sure that it can't be changed behind our back. */
1398 dir_fd = path_open_parent_safe(path);
1399 if (dir_fd < 0)
1400 return dir_fd;
1401
1402 bn = basename(path);
1403
1404 RUN_WITH_UMASK(0000) {
1405 mac_selinux_create_file_prepare(path, S_IFREG);
1406 fd = openat(dir_fd, bn, O_CREAT|O_EXCL|O_NOFOLLOW|O_NONBLOCK|O_CLOEXEC|O_WRONLY|O_NOCTTY, i->mode);
1407 mac_selinux_create_file_clear();
1408 }
1409
1410 if (fd < 0) {
1411 /* Even on a read-only filesystem, open(2) returns EEXIST if the
1412 * file already exists. It returns EROFS only if it needs to
1413 * create the file. */
1414 if (errno != EEXIST)
1415 return log_error_errno(errno, "Failed to create file %s: %m", path);
1416
1417 /* Re-open the file. At that point it must exist since open(2)
1418 * failed with EEXIST. We still need to check if the perms/mode
1419 * need to be changed. For read-only filesystems, we let
1420 * fd_set_perms() report the error if the perms need to be
1421 * modified. */
1422 fd = openat(dir_fd, bn, O_NOFOLLOW|O_CLOEXEC|O_PATH, i->mode);
1423 if (fd < 0)
1424 return log_error_errno(errno, "Failed to re-open file %s: %m", path);
1425
1426 if (fstat(fd, &stbuf) < 0)
1427 return log_error_errno(errno, "stat(%s) failed: %m", path);
1428
1429 if (!S_ISREG(stbuf.st_mode))
1430 return log_error_errno(SYNTHETIC_ERRNO(EEXIST),
1431 "%s exists and is not a regular file.",
1432 path);
1433
1434 st = &stbuf;
1435 } else {
1436
1437 log_debug("\"%s\" has been created.", path);
1438
1439 if (i->argument) {
1440 log_debug("Writing to \"%s\".", path);
1441
1442 r = loop_write(fd, i->argument, strlen(i->argument), false);
1443 if (r < 0)
1444 return log_error_errno(r, "Failed to write file \"%s\": %m", path);
1445 }
1446 }
1447
1448 return fd_set_perms(i, fd, path, st);
1449 }
1450
1451 static int truncate_file(Item *i, const char *path) {
1452 _cleanup_close_ int fd = -1, dir_fd = -1;
1453 struct stat stbuf, *st = NULL;
1454 bool erofs = false;
1455 int r = 0;
1456 char *bn;
1457
1458 assert(i);
1459 assert(path);
1460 assert(i->type == TRUNCATE_FILE || (i->type == CREATE_FILE && i->append_or_force));
1461
1462 /* We want to operate on regular file exclusively especially since
1463 * O_TRUNC is unspecified if the file is neither a regular file nor a
1464 * fifo nor a terminal device. Therefore we first open the file and make
1465 * sure it's a regular one before truncating it. */
1466
1467 /* Validate the path and keep the fd on the directory for opening the
1468 * file so we're sure that it can't be changed behind our back. */
1469 dir_fd = path_open_parent_safe(path);
1470 if (dir_fd < 0)
1471 return dir_fd;
1472
1473 bn = basename(path);
1474
1475 RUN_WITH_UMASK(0000) {
1476 mac_selinux_create_file_prepare(path, S_IFREG);
1477 fd = openat(dir_fd, bn, O_CREAT|O_NOFOLLOW|O_NONBLOCK|O_CLOEXEC|O_WRONLY|O_NOCTTY, i->mode);
1478 mac_selinux_create_file_clear();
1479 }
1480
1481 if (fd < 0) {
1482 if (errno != EROFS)
1483 return log_error_errno(errno, "Failed to open/create file %s: %m", path);
1484
1485 /* On a read-only filesystem, we don't want to fail if the
1486 * target is already empty and the perms are set. So we still
1487 * proceed with the sanity checks and let the remaining
1488 * operations fail with EROFS if they try to modify the target
1489 * file. */
1490
1491 fd = openat(dir_fd, bn, O_NOFOLLOW|O_CLOEXEC|O_PATH, i->mode);
1492 if (fd < 0) {
1493 if (errno == ENOENT)
1494 return log_error_errno(SYNTHETIC_ERRNO(EROFS),
1495 "Cannot create file %s on a read-only file system.",
1496 path);
1497
1498 return log_error_errno(errno, "Failed to re-open file %s: %m", path);
1499 }
1500
1501 erofs = true;
1502 }
1503
1504 if (fstat(fd, &stbuf) < 0)
1505 return log_error_errno(errno, "stat(%s) failed: %m", path);
1506
1507 if (!S_ISREG(stbuf.st_mode))
1508 return log_error_errno(SYNTHETIC_ERRNO(EEXIST),
1509 "%s exists and is not a regular file.",
1510 path);
1511
1512 if (stbuf.st_size > 0) {
1513 if (ftruncate(fd, 0) < 0) {
1514 r = erofs ? -EROFS : -errno;
1515 return log_error_errno(r, "Failed to truncate file %s: %m", path);
1516 }
1517 } else
1518 st = &stbuf;
1519
1520 log_debug("\"%s\" has been created.", path);
1521
1522 if (i->argument) {
1523 log_debug("Writing to \"%s\".", path);
1524
1525 r = loop_write(fd, i->argument, strlen(i->argument), false);
1526 if (r < 0) {
1527 r = erofs ? -EROFS : r;
1528 return log_error_errno(r, "Failed to write file %s: %m", path);
1529 }
1530 }
1531
1532 return fd_set_perms(i, fd, path, st);
1533 }
1534
1535 static int copy_files(Item *i) {
1536 _cleanup_close_ int dfd = -1, fd = -1;
1537 char *bn;
1538 int r;
1539
1540 log_debug("Copying tree \"%s\" to \"%s\".", i->argument, i->path);
1541
1542 bn = basename(i->path);
1543
1544 /* Validate the path and use the returned directory fd for copying the
1545 * target so we're sure that the path can't be changed behind our
1546 * back. */
1547 dfd = path_open_parent_safe(i->path);
1548 if (dfd < 0)
1549 return dfd;
1550
1551 r = copy_tree_at(AT_FDCWD, i->argument,
1552 dfd, bn,
1553 i->uid_set ? i->uid : UID_INVALID,
1554 i->gid_set ? i->gid : GID_INVALID,
1555 COPY_REFLINK | COPY_MERGE_EMPTY | COPY_MAC_CREATE | COPY_HARDLINKS);
1556 if (r < 0) {
1557 struct stat a, b;
1558
1559 /* If the target already exists on read-only filesystems, trying
1560 * to create the target will not fail with EEXIST but with
1561 * EROFS. */
1562 if (r == -EROFS && faccessat(dfd, bn, F_OK, AT_SYMLINK_NOFOLLOW) == 0)
1563 r = -EEXIST;
1564
1565 if (r != -EEXIST)
1566 return log_error_errno(r, "Failed to copy files to %s: %m", i->path);
1567
1568 if (stat(i->argument, &a) < 0)
1569 return log_error_errno(errno, "stat(%s) failed: %m", i->argument);
1570
1571 if (fstatat(dfd, bn, &b, AT_SYMLINK_NOFOLLOW) < 0)
1572 return log_error_errno(errno, "stat(%s) failed: %m", i->path);
1573
1574 if ((a.st_mode ^ b.st_mode) & S_IFMT) {
1575 log_debug("Can't copy to %s, file exists already and is of different type", i->path);
1576 return 0;
1577 }
1578 }
1579
1580 fd = openat(dfd, bn, O_NOFOLLOW|O_CLOEXEC|O_PATH);
1581 if (fd < 0)
1582 return log_error_errno(errno, "Failed to openat(%s): %m", i->path);
1583
1584 return fd_set_perms(i, fd, i->path, NULL);
1585 }
1586
1587 typedef enum {
1588 CREATION_NORMAL,
1589 CREATION_EXISTING,
1590 CREATION_FORCE,
1591 _CREATION_MODE_MAX,
1592 _CREATION_MODE_INVALID = -EINVAL,
1593 } CreationMode;
1594
1595 static const char *const creation_mode_verb_table[_CREATION_MODE_MAX] = {
1596 [CREATION_NORMAL] = "Created",
1597 [CREATION_EXISTING] = "Found existing",
1598 [CREATION_FORCE] = "Created replacement",
1599 };
1600
1601 DEFINE_PRIVATE_STRING_TABLE_LOOKUP_TO_STRING(creation_mode_verb, CreationMode);
1602
1603 static int create_directory_or_subvolume(const char *path, mode_t mode, bool subvol, CreationMode *creation) {
1604 _cleanup_close_ int pfd = -1;
1605 CreationMode c;
1606 int r;
1607
1608 assert(path);
1609
1610 if (!creation)
1611 creation = &c;
1612
1613 pfd = path_open_parent_safe(path);
1614 if (pfd < 0)
1615 return pfd;
1616
1617 if (subvol) {
1618 r = getenv_bool("SYSTEMD_TMPFILES_FORCE_SUBVOL");
1619 if (r < 0) {
1620 if (r != -ENXIO) /* env var is unset */
1621 log_warning_errno(r, "Cannot parse value of $SYSTEMD_TMPFILES_FORCE_SUBVOL, ignoring.");
1622 r = btrfs_is_subvol(empty_to_root(arg_root)) > 0;
1623 }
1624 if (!r)
1625 /* Don't create a subvolume unless the root directory is
1626 * one, too. We do this under the assumption that if the
1627 * root directory is just a plain directory (i.e. very
1628 * light-weight), we shouldn't try to split it up into
1629 * subvolumes (i.e. more heavy-weight). Thus, chroot()
1630 * environments and suchlike will get a full brtfs
1631 * subvolume set up below their tree only if they
1632 * specifically set up a btrfs subvolume for the root
1633 * dir too. */
1634
1635 subvol = false;
1636 else {
1637 RUN_WITH_UMASK((~mode) & 0777)
1638 r = btrfs_subvol_make_fd(pfd, basename(path));
1639 }
1640 } else
1641 r = 0;
1642
1643 if (!subvol || r == -ENOTTY)
1644 RUN_WITH_UMASK(0000)
1645 r = mkdirat_label(pfd, basename(path), mode);
1646
1647 if (r < 0) {
1648 int k;
1649
1650 if (!IN_SET(r, -EEXIST, -EROFS))
1651 return log_error_errno(r, "Failed to create directory or subvolume \"%s\": %m", path);
1652
1653 k = is_dir_fd(pfd);
1654 if (k == -ENOENT && r == -EROFS)
1655 return log_error_errno(r, "%s does not exist and cannot be created as the file system is read-only.", path);
1656 if (k < 0)
1657 return log_error_errno(k, "Failed to check if %s exists: %m", path);
1658 if (!k)
1659 return log_warning_errno(SYNTHETIC_ERRNO(EEXIST),
1660 "\"%s\" already exists and is not a directory.", path);
1661
1662 *creation = CREATION_EXISTING;
1663 } else
1664 *creation = CREATION_NORMAL;
1665
1666 log_debug("%s directory \"%s\".", creation_mode_verb_to_string(*creation), path);
1667
1668 r = openat(pfd, basename(path), O_NOCTTY|O_CLOEXEC|O_DIRECTORY);
1669 if (r < 0)
1670 return log_error_errno(errno, "Failed to open directory '%s': %m", basename(path));
1671
1672 return r;
1673 }
1674
1675 static int create_directory(Item *i, const char *path) {
1676 _cleanup_close_ int fd = -1;
1677
1678 assert(i);
1679 assert(IN_SET(i->type, CREATE_DIRECTORY, TRUNCATE_DIRECTORY));
1680
1681 fd = create_directory_or_subvolume(path, i->mode, false, NULL);
1682 if (fd == -EEXIST)
1683 return 0;
1684 if (fd < 0)
1685 return fd;
1686
1687 return fd_set_perms(i, fd, path, NULL);
1688 }
1689
1690 static int create_subvolume(Item *i, const char *path) {
1691 _cleanup_close_ int fd = -1;
1692 CreationMode creation;
1693 int r, q = 0;
1694
1695 assert(i);
1696 assert(IN_SET(i->type, CREATE_SUBVOLUME, CREATE_SUBVOLUME_NEW_QUOTA, CREATE_SUBVOLUME_INHERIT_QUOTA));
1697
1698 fd = create_directory_or_subvolume(path, i->mode, true, &creation);
1699 if (fd == -EEXIST)
1700 return 0;
1701 if (fd < 0)
1702 return fd;
1703
1704 if (creation == CREATION_NORMAL &&
1705 IN_SET(i->type, CREATE_SUBVOLUME_NEW_QUOTA, CREATE_SUBVOLUME_INHERIT_QUOTA)) {
1706 r = btrfs_subvol_auto_qgroup_fd(fd, 0, i->type == CREATE_SUBVOLUME_NEW_QUOTA);
1707 if (r == -ENOTTY)
1708 log_debug_errno(r, "Couldn't adjust quota for subvolume \"%s\" (unsupported fs or dir not a subvolume): %m", i->path);
1709 else if (r == -EROFS)
1710 log_debug_errno(r, "Couldn't adjust quota for subvolume \"%s\" (fs is read-only).", i->path);
1711 else if (r == -ENOTCONN)
1712 log_debug_errno(r, "Couldn't adjust quota for subvolume \"%s\" (quota support is disabled).", i->path);
1713 else if (r < 0)
1714 q = log_error_errno(r, "Failed to adjust quota for subvolume \"%s\": %m", i->path);
1715 else if (r > 0)
1716 log_debug("Adjusted quota for subvolume \"%s\".", i->path);
1717 else if (r == 0)
1718 log_debug("Quota for subvolume \"%s\" already in place, no change made.", i->path);
1719 }
1720
1721 r = fd_set_perms(i, fd, path, NULL);
1722 if (q < 0) /* prefer the quota change error from above */
1723 return q;
1724
1725 return r;
1726 }
1727
1728 static int empty_directory(Item *i, const char *path) {
1729 int r;
1730
1731 assert(i);
1732 assert(i->type == EMPTY_DIRECTORY);
1733
1734 r = is_dir(path, false);
1735 if (r == -ENOENT) {
1736 /* Option "e" operates only on existing objects. Do not
1737 * print errors about non-existent files or directories */
1738 log_debug("Skipping missing directory: %s", path);
1739 return 0;
1740 }
1741 if (r < 0)
1742 return log_error_errno(r, "is_dir() failed on path %s: %m", path);
1743 if (r == 0) {
1744 log_warning("\"%s\" already exists and is not a directory.", path);
1745 return 0;
1746 }
1747
1748 return path_set_perms(i, path);
1749 }
1750
1751 static int create_device(Item *i, mode_t file_type) {
1752 _cleanup_close_ int dfd = -1, fd = -1;
1753 CreationMode creation;
1754 char *bn;
1755 int r;
1756
1757 assert(i);
1758 assert(IN_SET(file_type, S_IFBLK, S_IFCHR));
1759
1760 bn = basename(i->path);
1761
1762 /* Validate the path and use the returned directory fd for copying the
1763 * target so we're sure that the path can't be changed behind our
1764 * back. */
1765 dfd = path_open_parent_safe(i->path);
1766 if (dfd < 0)
1767 return dfd;
1768
1769 RUN_WITH_UMASK(0000) {
1770 mac_selinux_create_file_prepare(i->path, file_type);
1771 r = mknodat(dfd, bn, i->mode | file_type, i->major_minor);
1772 mac_selinux_create_file_clear();
1773 }
1774
1775 if (r < 0) {
1776 struct stat st;
1777
1778 if (errno == EPERM) {
1779 log_debug("We lack permissions, possibly because of cgroup configuration; "
1780 "skipping creation of device node %s.", i->path);
1781 return 0;
1782 }
1783
1784 if (errno != EEXIST)
1785 return log_error_errno(errno, "Failed to create device node %s: %m", i->path);
1786
1787 if (fstatat(dfd, bn, &st, 0) < 0)
1788 return log_error_errno(errno, "stat(%s) failed: %m", i->path);
1789
1790 if ((st.st_mode & S_IFMT) != file_type) {
1791
1792 if (i->append_or_force) {
1793
1794 RUN_WITH_UMASK(0000) {
1795 mac_selinux_create_file_prepare(i->path, file_type);
1796 /* FIXME: need to introduce mknodat_atomic() */
1797 r = mknod_atomic(i->path, i->mode | file_type, i->major_minor);
1798 mac_selinux_create_file_clear();
1799 }
1800
1801 if (r < 0)
1802 return log_error_errno(r, "Failed to create device node \"%s\": %m", i->path);
1803 creation = CREATION_FORCE;
1804 } else {
1805 log_warning("\"%s\" already exists is not a device node.", i->path);
1806 return 0;
1807 }
1808 } else
1809 creation = CREATION_EXISTING;
1810 } else
1811 creation = CREATION_NORMAL;
1812
1813 log_debug("%s %s device node \"%s\" %u:%u.",
1814 creation_mode_verb_to_string(creation),
1815 i->type == CREATE_BLOCK_DEVICE ? "block" : "char",
1816 i->path, major(i->mode), minor(i->mode));
1817
1818 fd = openat(dfd, bn, O_NOFOLLOW|O_CLOEXEC|O_PATH);
1819 if (fd < 0)
1820 return log_error_errno(errno, "Failed to openat(%s): %m", i->path);
1821
1822 return fd_set_perms(i, fd, i->path, NULL);
1823 }
1824
1825 static int create_fifo(Item *i, const char *path) {
1826 _cleanup_close_ int pfd = -1, fd = -1;
1827 CreationMode creation;
1828 struct stat st;
1829 char *bn;
1830 int r;
1831
1832 pfd = path_open_parent_safe(path);
1833 if (pfd < 0)
1834 return pfd;
1835
1836 bn = basename(path);
1837
1838 RUN_WITH_UMASK(0000) {
1839 mac_selinux_create_file_prepare(path, S_IFIFO);
1840 r = mkfifoat(pfd, bn, i->mode);
1841 mac_selinux_create_file_clear();
1842 }
1843
1844 if (r < 0) {
1845 if (errno != EEXIST)
1846 return log_error_errno(errno, "Failed to create fifo %s: %m", path);
1847
1848 if (fstatat(pfd, bn, &st, AT_SYMLINK_NOFOLLOW) < 0)
1849 return log_error_errno(errno, "stat(%s) failed: %m", path);
1850
1851 if (!S_ISFIFO(st.st_mode)) {
1852
1853 if (i->append_or_force) {
1854 RUN_WITH_UMASK(0000) {
1855 mac_selinux_create_file_prepare(path, S_IFIFO);
1856 r = mkfifoat_atomic(pfd, bn, i->mode);
1857 mac_selinux_create_file_clear();
1858 }
1859
1860 if (r < 0)
1861 return log_error_errno(r, "Failed to create fifo %s: %m", path);
1862 creation = CREATION_FORCE;
1863 } else {
1864 log_warning("\"%s\" already exists and is not a fifo.", path);
1865 return 0;
1866 }
1867 } else
1868 creation = CREATION_EXISTING;
1869 } else
1870 creation = CREATION_NORMAL;
1871
1872 log_debug("%s fifo \"%s\".", creation_mode_verb_to_string(creation), path);
1873
1874 fd = openat(pfd, bn, O_NOFOLLOW|O_CLOEXEC|O_PATH);
1875 if (fd < 0)
1876 return log_error_errno(errno, "Failed to openat(%s): %m", path);
1877
1878 return fd_set_perms(i, fd, i->path, NULL);
1879 }
1880
1881 typedef int (*action_t)(Item *i, const char *path);
1882 typedef int (*fdaction_t)(Item *i, int fd, const char *path, const struct stat *st);
1883
1884 static int item_do(Item *i, int fd, const char *path, fdaction_t action) {
1885 struct stat st;
1886 int r = 0, q;
1887
1888 assert(i);
1889 assert(path);
1890 assert(fd >= 0);
1891
1892 if (fstat(fd, &st) < 0) {
1893 r = log_error_errno(errno, "fstat() on file failed: %m");
1894 goto finish;
1895 }
1896
1897 /* This returns the first error we run into, but nevertheless
1898 * tries to go on */
1899 r = action(i, fd, path, &st);
1900
1901 if (S_ISDIR(st.st_mode)) {
1902 char procfs_path[STRLEN("/proc/self/fd/") + DECIMAL_STR_MAX(int)];
1903 _cleanup_closedir_ DIR *d = NULL;
1904 struct dirent *de;
1905
1906 /* The passed 'fd' was opened with O_PATH. We need to convert
1907 * it into a 'regular' fd before reading the directory content. */
1908 xsprintf(procfs_path, "/proc/self/fd/%i", fd);
1909
1910 d = opendir(procfs_path);
1911 if (!d) {
1912 log_error_errno(errno, "Failed to opendir() '%s': %m", procfs_path);
1913 if (r == 0)
1914 r = -errno;
1915 goto finish;
1916 }
1917
1918 FOREACH_DIRENT_ALL(de, d, q = -errno; goto finish) {
1919 int de_fd;
1920
1921 if (dot_or_dot_dot(de->d_name))
1922 continue;
1923
1924 de_fd = openat(fd, de->d_name, O_NOFOLLOW|O_CLOEXEC|O_PATH);
1925 if (de_fd < 0)
1926 q = log_error_errno(errno, "Failed to open() file '%s': %m", de->d_name);
1927 else {
1928 _cleanup_free_ char *de_path = NULL;
1929
1930 de_path = path_join(path, de->d_name);
1931 if (!de_path)
1932 q = log_oom();
1933 else
1934 /* Pass ownership of dirent fd over */
1935 q = item_do(i, de_fd, de_path, action);
1936 }
1937
1938 if (q < 0 && r == 0)
1939 r = q;
1940 }
1941 }
1942 finish:
1943 safe_close(fd);
1944 return r;
1945 }
1946
1947 static int glob_item(Item *i, action_t action) {
1948 _cleanup_globfree_ glob_t g = {
1949 .gl_opendir = (void *(*)(const char *)) opendir_nomod,
1950 };
1951 int r = 0, k;
1952 char **fn;
1953
1954 k = safe_glob(i->path, GLOB_NOSORT|GLOB_BRACE, &g);
1955 if (k < 0 && k != -ENOENT)
1956 return log_error_errno(k, "glob(%s) failed: %m", i->path);
1957
1958 STRV_FOREACH(fn, g.gl_pathv) {
1959 k = action(i, *fn);
1960 if (k < 0 && r == 0)
1961 r = k;
1962 }
1963
1964 return r;
1965 }
1966
1967 static int glob_item_recursively(Item *i, fdaction_t action) {
1968 _cleanup_globfree_ glob_t g = {
1969 .gl_opendir = (void *(*)(const char *)) opendir_nomod,
1970 };
1971 int r = 0, k;
1972 char **fn;
1973
1974 k = safe_glob(i->path, GLOB_NOSORT|GLOB_BRACE, &g);
1975 if (k < 0 && k != -ENOENT)
1976 return log_error_errno(k, "glob(%s) failed: %m", i->path);
1977
1978 STRV_FOREACH(fn, g.gl_pathv) {
1979 _cleanup_close_ int fd = -1;
1980
1981 /* Make sure we won't trigger/follow file object (such as
1982 * device nodes, automounts, ...) pointed out by 'fn' with
1983 * O_PATH. Note, when O_PATH is used, flags other than
1984 * O_CLOEXEC, O_DIRECTORY, and O_NOFOLLOW are ignored. */
1985
1986 fd = open(*fn, O_CLOEXEC|O_NOFOLLOW|O_PATH);
1987 if (fd < 0) {
1988 log_error_errno(errno, "Opening '%s' failed: %m", *fn);
1989 if (r == 0)
1990 r = -errno;
1991 continue;
1992 }
1993
1994 k = item_do(i, fd, *fn, action);
1995 if (k < 0 && r == 0)
1996 r = k;
1997
1998 /* we passed fd ownership to the previous call */
1999 fd = -1;
2000 }
2001
2002 return r;
2003 }
2004
2005 static int create_item(Item *i) {
2006 CreationMode creation;
2007 int r = 0;
2008
2009 assert(i);
2010
2011 log_debug("Running create action for entry %c %s", (char) i->type, i->path);
2012
2013 switch (i->type) {
2014
2015 case IGNORE_PATH:
2016 case IGNORE_DIRECTORY_PATH:
2017 case REMOVE_PATH:
2018 case RECURSIVE_REMOVE_PATH:
2019 return 0;
2020
2021 case TRUNCATE_FILE:
2022 case CREATE_FILE:
2023 RUN_WITH_UMASK(0000)
2024 (void) mkdir_parents_label(i->path, 0755);
2025
2026 if ((i->type == CREATE_FILE && i->append_or_force) || i->type == TRUNCATE_FILE)
2027 r = truncate_file(i, i->path);
2028 else
2029 r = create_file(i, i->path);
2030
2031 if (r < 0)
2032 return r;
2033 break;
2034
2035 case COPY_FILES:
2036 RUN_WITH_UMASK(0000)
2037 (void) mkdir_parents_label(i->path, 0755);
2038
2039 r = copy_files(i);
2040 if (r < 0)
2041 return r;
2042 break;
2043
2044 case WRITE_FILE:
2045 r = glob_item(i, write_one_file);
2046 if (r < 0)
2047 return r;
2048
2049 break;
2050
2051 case CREATE_DIRECTORY:
2052 case TRUNCATE_DIRECTORY:
2053 RUN_WITH_UMASK(0000)
2054 (void) mkdir_parents_label(i->path, 0755);
2055
2056 r = create_directory(i, i->path);
2057 if (r < 0)
2058 return r;
2059 break;
2060
2061 case CREATE_SUBVOLUME:
2062 case CREATE_SUBVOLUME_INHERIT_QUOTA:
2063 case CREATE_SUBVOLUME_NEW_QUOTA:
2064 RUN_WITH_UMASK(0000)
2065 (void) mkdir_parents_label(i->path, 0755);
2066
2067 r = create_subvolume(i, i->path);
2068 if (r < 0)
2069 return r;
2070 break;
2071
2072 case EMPTY_DIRECTORY:
2073 r = glob_item(i, empty_directory);
2074 if (r < 0)
2075 return r;
2076 break;
2077
2078 case CREATE_FIFO:
2079 RUN_WITH_UMASK(0000)
2080 (void) mkdir_parents_label(i->path, 0755);
2081
2082 r = create_fifo(i, i->path);
2083 if (r < 0)
2084 return r;
2085 break;
2086
2087 case CREATE_SYMLINK: {
2088 RUN_WITH_UMASK(0000)
2089 (void) mkdir_parents_label(i->path, 0755);
2090
2091 mac_selinux_create_file_prepare(i->path, S_IFLNK);
2092 r = symlink(i->argument, i->path);
2093 mac_selinux_create_file_clear();
2094
2095 if (r < 0) {
2096 _cleanup_free_ char *x = NULL;
2097
2098 if (errno != EEXIST)
2099 return log_error_errno(errno, "symlink(%s, %s) failed: %m", i->argument, i->path);
2100
2101 r = readlink_malloc(i->path, &x);
2102 if (r < 0 || !streq(i->argument, x)) {
2103
2104 if (i->append_or_force) {
2105 mac_selinux_create_file_prepare(i->path, S_IFLNK);
2106 r = symlink_atomic(i->argument, i->path);
2107 mac_selinux_create_file_clear();
2108
2109 if (IN_SET(r, -EISDIR, -EEXIST, -ENOTEMPTY)) {
2110 r = rm_rf(i->path, REMOVE_ROOT|REMOVE_PHYSICAL);
2111 if (r < 0)
2112 return log_error_errno(r, "rm -fr %s failed: %m", i->path);
2113
2114 mac_selinux_create_file_prepare(i->path, S_IFLNK);
2115 r = symlink(i->argument, i->path) < 0 ? -errno : 0;
2116 mac_selinux_create_file_clear();
2117 }
2118 if (r < 0)
2119 return log_error_errno(r, "symlink(%s, %s) failed: %m", i->argument, i->path);
2120
2121 creation = CREATION_FORCE;
2122 } else {
2123 log_debug("\"%s\" is not a symlink or does not point to the correct path.", i->path);
2124 return 0;
2125 }
2126 } else
2127 creation = CREATION_EXISTING;
2128 } else
2129
2130 creation = CREATION_NORMAL;
2131 log_debug("%s symlink \"%s\".", creation_mode_verb_to_string(creation), i->path);
2132 break;
2133 }
2134
2135 case CREATE_BLOCK_DEVICE:
2136 case CREATE_CHAR_DEVICE:
2137 if (have_effective_cap(CAP_MKNOD) == 0) {
2138 /* In a container we lack CAP_MKNOD. We shouldn't attempt to create the device node in that
2139 * case to avoid noise, and we don't support virtualized devices in containers anyway. */
2140
2141 log_debug("We lack CAP_MKNOD, skipping creation of device node %s.", i->path);
2142 return 0;
2143 }
2144
2145 RUN_WITH_UMASK(0000)
2146 (void) mkdir_parents_label(i->path, 0755);
2147
2148 r = create_device(i, i->type == CREATE_BLOCK_DEVICE ? S_IFBLK : S_IFCHR);
2149 if (r < 0)
2150 return r;
2151
2152 break;
2153
2154 case ADJUST_MODE:
2155 case RELABEL_PATH:
2156 r = glob_item(i, path_set_perms);
2157 if (r < 0)
2158 return r;
2159 break;
2160
2161 case RECURSIVE_RELABEL_PATH:
2162 r = glob_item_recursively(i, fd_set_perms);
2163 if (r < 0)
2164 return r;
2165 break;
2166
2167 case SET_XATTR:
2168 r = glob_item(i, path_set_xattrs);
2169 if (r < 0)
2170 return r;
2171 break;
2172
2173 case RECURSIVE_SET_XATTR:
2174 r = glob_item_recursively(i, fd_set_xattrs);
2175 if (r < 0)
2176 return r;
2177 break;
2178
2179 case SET_ACL:
2180 r = glob_item(i, path_set_acls);
2181 if (r < 0)
2182 return r;
2183 break;
2184
2185 case RECURSIVE_SET_ACL:
2186 r = glob_item_recursively(i, fd_set_acls);
2187 if (r < 0)
2188 return r;
2189 break;
2190
2191 case SET_ATTRIBUTE:
2192 r = glob_item(i, path_set_attribute);
2193 if (r < 0)
2194 return r;
2195 break;
2196
2197 case RECURSIVE_SET_ATTRIBUTE:
2198 r = glob_item_recursively(i, fd_set_attribute);
2199 if (r < 0)
2200 return r;
2201 break;
2202 }
2203
2204 return 0;
2205 }
2206
2207 static int remove_item_instance(Item *i, const char *instance) {
2208 int r;
2209
2210 assert(i);
2211
2212 switch (i->type) {
2213
2214 case REMOVE_PATH:
2215 if (remove(instance) < 0 && errno != ENOENT)
2216 return log_error_errno(errno, "rm(%s): %m", instance);
2217
2218 break;
2219
2220 case RECURSIVE_REMOVE_PATH:
2221 /* FIXME: we probably should use dir_cleanup() here instead of rm_rf() so that 'x' is honoured. */
2222 log_debug("rm -rf \"%s\"", instance);
2223 r = rm_rf(instance, REMOVE_ROOT|REMOVE_SUBVOLUME|REMOVE_PHYSICAL);
2224 if (r < 0 && r != -ENOENT)
2225 return log_error_errno(r, "rm_rf(%s): %m", instance);
2226
2227 break;
2228
2229 default:
2230 assert_not_reached("wut?");
2231 }
2232
2233 return 0;
2234 }
2235
2236 static int remove_item(Item *i) {
2237 int r;
2238
2239 assert(i);
2240
2241 log_debug("Running remove action for entry %c %s", (char) i->type, i->path);
2242
2243 switch (i->type) {
2244
2245 case TRUNCATE_DIRECTORY:
2246 /* FIXME: we probably should use dir_cleanup() here instead of rm_rf() so that 'x' is honoured. */
2247 log_debug("rm -rf \"%s\"", i->path);
2248 r = rm_rf(i->path, REMOVE_PHYSICAL);
2249 if (r < 0 && r != -ENOENT)
2250 return log_error_errno(r, "rm_rf(%s): %m", i->path);
2251
2252 return 0;
2253
2254 case REMOVE_PATH:
2255 case RECURSIVE_REMOVE_PATH:
2256 return glob_item(i, remove_item_instance);
2257
2258 default:
2259 return 0;
2260 }
2261 }
2262
2263 static int clean_item_instance(Item *i, const char* instance) {
2264 char timestamp[FORMAT_TIMESTAMP_MAX];
2265 _cleanup_closedir_ DIR *d = NULL;
2266 STRUCT_STATX_DEFINE(sx);
2267 int mountpoint, r;
2268 usec_t cutoff, n;
2269
2270 assert(i);
2271
2272 if (!i->age_set)
2273 return 0;
2274
2275 n = now(CLOCK_REALTIME);
2276 if (n < i->age)
2277 return 0;
2278
2279 cutoff = n - i->age;
2280
2281 d = opendir_nomod(instance);
2282 if (!d) {
2283 if (IN_SET(errno, ENOENT, ENOTDIR)) {
2284 log_debug_errno(errno, "Directory \"%s\": %m", instance);
2285 return 0;
2286 }
2287
2288 return log_error_errno(errno, "Failed to open directory %s: %m", instance);
2289 }
2290
2291 r = statx_fallback(dirfd(d), "", AT_EMPTY_PATH, STATX_MODE|STATX_INO|STATX_ATIME|STATX_MTIME, &sx);
2292 if (r < 0)
2293 return log_error_errno(r, "statx(%s) failed: %m", instance);
2294
2295 if (FLAGS_SET(sx.stx_attributes_mask, STATX_ATTR_MOUNT_ROOT))
2296 mountpoint = FLAGS_SET(sx.stx_attributes, STATX_ATTR_MOUNT_ROOT);
2297 else {
2298 struct stat ps;
2299
2300 if (fstatat(dirfd(d), "..", &ps, AT_SYMLINK_NOFOLLOW) != 0)
2301 return log_error_errno(errno, "stat(%s/..) failed: %m", i->path);
2302
2303 mountpoint =
2304 sx.stx_dev_major != major(ps.st_dev) ||
2305 sx.stx_dev_minor != minor(ps.st_dev) ||
2306 sx.stx_ino != ps.st_ino;
2307 }
2308
2309 log_debug("Cleanup threshold for %s \"%s\" is %s",
2310 mountpoint ? "mount point" : "directory",
2311 instance,
2312 format_timestamp_style(timestamp, sizeof(timestamp), cutoff, TIMESTAMP_US));
2313
2314 return dir_cleanup(i, instance, d,
2315 load_statx_timestamp_nsec(&sx.stx_atime),
2316 load_statx_timestamp_nsec(&sx.stx_mtime),
2317 cutoff * NSEC_PER_USEC,
2318 sx.stx_dev_major, sx.stx_dev_minor, mountpoint,
2319 MAX_DEPTH, i->keep_first_level);
2320 }
2321
2322 static int clean_item(Item *i) {
2323 assert(i);
2324
2325 log_debug("Running clean action for entry %c %s", (char) i->type, i->path);
2326
2327 switch (i->type) {
2328 case CREATE_DIRECTORY:
2329 case CREATE_SUBVOLUME:
2330 case CREATE_SUBVOLUME_INHERIT_QUOTA:
2331 case CREATE_SUBVOLUME_NEW_QUOTA:
2332 case TRUNCATE_DIRECTORY:
2333 case IGNORE_PATH:
2334 case COPY_FILES:
2335 clean_item_instance(i, i->path);
2336 return 0;
2337 case EMPTY_DIRECTORY:
2338 case IGNORE_DIRECTORY_PATH:
2339 return glob_item(i, clean_item_instance);
2340 default:
2341 return 0;
2342 }
2343 }
2344
2345 static int process_item(Item *i, OperationMask operation) {
2346 OperationMask todo;
2347 int r, q, p;
2348
2349 assert(i);
2350
2351 todo = operation & ~i->done;
2352 if (todo == 0) /* Everything already done? */
2353 return 0;
2354
2355 i->done |= operation;
2356
2357 r = chase_symlinks(i->path, arg_root, CHASE_NO_AUTOFS|CHASE_WARN, NULL, NULL);
2358 if (r == -EREMOTE) {
2359 log_notice_errno(r, "Skipping %s", i->path);
2360 return 0;
2361 }
2362 if (r < 0)
2363 log_debug_errno(r, "Failed to determine whether '%s' is below autofs, ignoring: %m", i->path);
2364
2365 r = FLAGS_SET(operation, OPERATION_CREATE) ? create_item(i) : 0;
2366 /* Failure can only be tolerated for create */
2367 if (i->allow_failure)
2368 r = 0;
2369
2370 q = FLAGS_SET(operation, OPERATION_REMOVE) ? remove_item(i) : 0;
2371 p = FLAGS_SET(operation, OPERATION_CLEAN) ? clean_item(i) : 0;
2372
2373 return r < 0 ? r :
2374 q < 0 ? q :
2375 p;
2376 }
2377
2378 static int process_item_array(ItemArray *array, OperationMask operation) {
2379 int r = 0;
2380 size_t n;
2381
2382 assert(array);
2383
2384 /* Create any parent first. */
2385 if (FLAGS_SET(operation, OPERATION_CREATE) && array->parent)
2386 r = process_item_array(array->parent, operation & OPERATION_CREATE);
2387
2388 /* Clean up all children first */
2389 if ((operation & (OPERATION_REMOVE|OPERATION_CLEAN)) && !set_isempty(array->children)) {
2390 ItemArray *c;
2391
2392 SET_FOREACH(c, array->children) {
2393 int k;
2394
2395 k = process_item_array(c, operation & (OPERATION_REMOVE|OPERATION_CLEAN));
2396 if (k < 0 && r == 0)
2397 r = k;
2398 }
2399 }
2400
2401 for (n = 0; n < array->n_items; n++) {
2402 int k;
2403
2404 k = process_item(array->items + n, operation);
2405 if (k < 0 && r == 0)
2406 r = k;
2407 }
2408
2409 return r;
2410 }
2411
2412 static void item_free_contents(Item *i) {
2413 assert(i);
2414 free(i->path);
2415 free(i->argument);
2416 strv_free(i->xattrs);
2417
2418 #if HAVE_ACL
2419 acl_free(i->acl_access);
2420 acl_free(i->acl_default);
2421 #endif
2422 }
2423
2424 static ItemArray* item_array_free(ItemArray *a) {
2425 size_t n;
2426
2427 if (!a)
2428 return NULL;
2429
2430 for (n = 0; n < a->n_items; n++)
2431 item_free_contents(a->items + n);
2432
2433 set_free(a->children);
2434 free(a->items);
2435 return mfree(a);
2436 }
2437
2438 static int item_compare(const Item *a, const Item *b) {
2439 /* Make sure that the ownership taking item is put first, so
2440 * that we first create the node, and then can adjust it */
2441
2442 if (takes_ownership(a->type) && !takes_ownership(b->type))
2443 return -1;
2444 if (!takes_ownership(a->type) && takes_ownership(b->type))
2445 return 1;
2446
2447 return CMP(a->type, b->type);
2448 }
2449
2450 static bool item_compatible(Item *a, Item *b) {
2451 assert(a);
2452 assert(b);
2453 assert(streq(a->path, b->path));
2454
2455 if (takes_ownership(a->type) && takes_ownership(b->type))
2456 /* check if the items are the same */
2457 return streq_ptr(a->argument, b->argument) &&
2458
2459 a->uid_set == b->uid_set &&
2460 a->uid == b->uid &&
2461
2462 a->gid_set == b->gid_set &&
2463 a->gid == b->gid &&
2464
2465 a->mode_set == b->mode_set &&
2466 a->mode == b->mode &&
2467
2468 a->age_set == b->age_set &&
2469 a->age == b->age &&
2470
2471 a->mask_perms == b->mask_perms &&
2472
2473 a->keep_first_level == b->keep_first_level &&
2474
2475 a->major_minor == b->major_minor;
2476
2477 return true;
2478 }
2479
2480 static bool should_include_path(const char *path) {
2481 char **prefix;
2482
2483 STRV_FOREACH(prefix, arg_exclude_prefixes)
2484 if (path_startswith(path, *prefix)) {
2485 log_debug("Entry \"%s\" matches exclude prefix \"%s\", skipping.",
2486 path, *prefix);
2487 return false;
2488 }
2489
2490 STRV_FOREACH(prefix, arg_include_prefixes)
2491 if (path_startswith(path, *prefix)) {
2492 log_debug("Entry \"%s\" matches include prefix \"%s\".", path, *prefix);
2493 return true;
2494 }
2495
2496 /* no matches, so we should include this path only if we have no allow list at all */
2497 if (strv_isempty(arg_include_prefixes))
2498 return true;
2499
2500 log_debug("Entry \"%s\" does not match any include prefix, skipping.", path);
2501 return false;
2502 }
2503
2504 static int specifier_expansion_from_arg(Item *i) {
2505 _cleanup_free_ char *unescaped = NULL, *resolved = NULL;
2506 char **xattr;
2507 int r;
2508
2509 assert(i);
2510
2511 if (!i->argument)
2512 return 0;
2513
2514 switch (i->type) {
2515 case COPY_FILES:
2516 case CREATE_SYMLINK:
2517 case CREATE_FILE:
2518 case TRUNCATE_FILE:
2519 case WRITE_FILE:
2520 r = cunescape(i->argument, 0, &unescaped);
2521 if (r < 0)
2522 return log_error_errno(r, "Failed to unescape parameter to write: %s", i->argument);
2523
2524 r = specifier_printf(unescaped, PATH_MAX-1, specifier_table, NULL, &resolved);
2525 if (r < 0)
2526 return r;
2527
2528 free_and_replace(i->argument, resolved);
2529 break;
2530
2531 case SET_XATTR:
2532 case RECURSIVE_SET_XATTR:
2533 STRV_FOREACH(xattr, i->xattrs) {
2534 r = specifier_printf(*xattr, SIZE_MAX, specifier_table, NULL, &resolved);
2535 if (r < 0)
2536 return r;
2537
2538 free_and_replace(*xattr, resolved);
2539 }
2540 break;
2541
2542 default:
2543 break;
2544 }
2545 return 0;
2546 }
2547
2548 static int patch_var_run(const char *fname, unsigned line, char **path) {
2549 const char *k;
2550 char *n;
2551
2552 assert(path);
2553 assert(*path);
2554
2555 /* Optionally rewrites lines referencing /var/run/, to use /run/ instead. Why bother? tmpfiles merges lines in
2556 * some cases and detects conflicts in others. If files/directories are specified through two equivalent lines
2557 * this is problematic as neither case will be detected. Ideally we'd detect these cases by resolving symlinks
2558 * early, but that's precisely not what we can do here as this code very likely is running very early on, at a
2559 * time where the paths in question are not available yet, or even more importantly, our own tmpfiles rules
2560 * might create the paths that are intermediary to the listed paths. We can't really cover the generic case,
2561 * but the least we can do is cover the specific case of /var/run vs. /run, as /var/run is a legacy name for
2562 * /run only, and we explicitly document that and require that on systemd systems the former is a symlink to
2563 * the latter. Moreover files below this path are by far the primary usecase for tmpfiles.d/. */
2564
2565 k = path_startswith(*path, "/var/run/");
2566 if (isempty(k)) /* Don't complain about other paths than /var/run, and not about /var/run itself either. */
2567 return 0;
2568
2569 n = path_join("/run", k);
2570 if (!n)
2571 return log_oom();
2572
2573 /* Also log about this briefly. We do so at LOG_NOTICE level, as we fixed up the situation automatically, hence
2574 * there's no immediate need for action by the user. However, in the interest of making things less confusing
2575 * to the user, let's still inform the user that these snippets should really be updated. */
2576 log_syntax(NULL, LOG_NOTICE, fname, line, 0,
2577 "Line references path below legacy directory /var/run/, updating %s → %s; please update the tmpfiles.d/ drop-in file accordingly.",
2578 *path, n);
2579
2580 free_and_replace(*path, n);
2581
2582 return 0;
2583 }
2584
2585 static int find_uid(const char *user, uid_t *ret_uid, Hashmap **cache) {
2586 int r;
2587
2588 assert(user);
2589 assert(ret_uid);
2590
2591 /* First: parse as numeric UID string */
2592 r = parse_uid(user, ret_uid);
2593 if (r >= 0)
2594 return r;
2595
2596 /* Second: pass to NSS if we are running "online" */
2597 if (!arg_root)
2598 return get_user_creds(&user, ret_uid, NULL, NULL, NULL, 0);
2599
2600 /* Third, synthesize "root" unconditionally */
2601 if (streq(user, "root")) {
2602 *ret_uid = 0;
2603 return 0;
2604 }
2605
2606 /* Fourth: use fgetpwent() to read /etc/passwd directly, if we are "offline" */
2607 return name_to_uid_offline(arg_root, user, ret_uid, cache);
2608 }
2609
2610 static int find_gid(const char *group, gid_t *ret_gid, Hashmap **cache) {
2611 int r;
2612
2613 assert(group);
2614 assert(ret_gid);
2615
2616 /* First: parse as numeric GID string */
2617 r = parse_gid(group, ret_gid);
2618 if (r >= 0)
2619 return r;
2620
2621 /* Second: pass to NSS if we are running "online" */
2622 if (!arg_root)
2623 return get_group_creds(&group, ret_gid, 0);
2624
2625 /* Third, synthesize "root" unconditionally */
2626 if (streq(group, "root")) {
2627 *ret_gid = 0;
2628 return 0;
2629 }
2630
2631 /* Fourth: use fgetgrent() to read /etc/group directly, if we are "offline" */
2632 return name_to_gid_offline(arg_root, group, ret_gid, cache);
2633 }
2634
2635 static int parse_line(
2636 const char *fname,
2637 unsigned line,
2638 const char *buffer,
2639 bool *invalid_config,
2640 Hashmap **uid_cache,
2641 Hashmap **gid_cache) {
2642
2643 _cleanup_free_ char *action = NULL, *mode = NULL, *user = NULL, *group = NULL, *age = NULL, *path = NULL;
2644 _cleanup_(item_free_contents) Item i = {};
2645 ItemArray *existing;
2646 OrderedHashmap *h;
2647 int r, pos;
2648 bool append_or_force = false, boot = false, allow_failure = false;
2649
2650 assert(fname);
2651 assert(line >= 1);
2652 assert(buffer);
2653
2654 r = extract_many_words(
2655 &buffer,
2656 NULL,
2657 EXTRACT_UNQUOTE,
2658 &action,
2659 &path,
2660 &mode,
2661 &user,
2662 &group,
2663 &age,
2664 NULL);
2665 if (r < 0) {
2666 if (IN_SET(r, -EINVAL, -EBADSLT))
2667 /* invalid quoting and such or an unknown specifier */
2668 *invalid_config = true;
2669 return log_syntax(NULL, LOG_ERR, fname, line, r, "Failed to parse line: %m");
2670 } else if (r < 2) {
2671 *invalid_config = true;
2672 return log_syntax(NULL, LOG_ERR, fname, line, SYNTHETIC_ERRNO(EBADMSG), "Syntax error.");
2673 }
2674
2675 if (!empty_or_dash(buffer)) {
2676 i.argument = strdup(buffer);
2677 if (!i.argument)
2678 return log_oom();
2679 }
2680
2681 if (isempty(action)) {
2682 *invalid_config = true;
2683 return log_syntax(NULL, LOG_ERR, fname, line, SYNTHETIC_ERRNO(EBADMSG), "Command too short '%s'.", action);
2684 }
2685
2686 for (pos = 1; action[pos]; pos++) {
2687 if (action[pos] == '!' && !boot)
2688 boot = true;
2689 else if (action[pos] == '+' && !append_or_force)
2690 append_or_force = true;
2691 else if (action[pos] == '-' && !allow_failure)
2692 allow_failure = true;
2693 else {
2694 *invalid_config = true;
2695 return log_syntax(NULL, LOG_ERR, fname, line, SYNTHETIC_ERRNO(EBADMSG), "Unknown modifiers in command '%s'", action);
2696 }
2697 }
2698
2699 if (boot && !arg_boot) {
2700 log_syntax(NULL, LOG_DEBUG, fname, line, 0, "Ignoring entry %s \"%s\" because --boot is not specified.", action, path);
2701 return 0;
2702 }
2703
2704 i.type = action[0];
2705 i.append_or_force = append_or_force;
2706 i.allow_failure = allow_failure;
2707
2708 r = specifier_printf(path, PATH_MAX-1, specifier_table, NULL, &i.path);
2709 if (r == -ENXIO)
2710 return log_unresolvable_specifier(fname, line);
2711 if (r < 0) {
2712 if (IN_SET(r, -EINVAL, -EBADSLT))
2713 *invalid_config = true;
2714 return log_syntax(NULL, LOG_ERR, fname, line, r, "Failed to replace specifiers in '%s': %m", path);
2715 }
2716
2717 r = patch_var_run(fname, line, &i.path);
2718 if (r < 0)
2719 return r;
2720
2721 switch (i.type) {
2722
2723 case CREATE_DIRECTORY:
2724 case CREATE_SUBVOLUME:
2725 case CREATE_SUBVOLUME_INHERIT_QUOTA:
2726 case CREATE_SUBVOLUME_NEW_QUOTA:
2727 case EMPTY_DIRECTORY:
2728 case TRUNCATE_DIRECTORY:
2729 case CREATE_FIFO:
2730 case IGNORE_PATH:
2731 case IGNORE_DIRECTORY_PATH:
2732 case REMOVE_PATH:
2733 case RECURSIVE_REMOVE_PATH:
2734 case ADJUST_MODE:
2735 case RELABEL_PATH:
2736 case RECURSIVE_RELABEL_PATH:
2737 if (i.argument)
2738 log_syntax(NULL, LOG_WARNING, fname, line, 0, "%c lines don't take argument fields, ignoring.", i.type);
2739
2740 break;
2741
2742 case CREATE_FILE:
2743 case TRUNCATE_FILE:
2744 break;
2745
2746 case CREATE_SYMLINK:
2747 if (!i.argument) {
2748 i.argument = path_join("/usr/share/factory", i.path);
2749 if (!i.argument)
2750 return log_oom();
2751 }
2752 break;
2753
2754 case WRITE_FILE:
2755 if (!i.argument) {
2756 *invalid_config = true;
2757 return log_syntax(NULL, LOG_ERR, fname, line, SYNTHETIC_ERRNO(EBADMSG), "Write file requires argument.");
2758 }
2759 break;
2760
2761 case COPY_FILES:
2762 if (!i.argument) {
2763 i.argument = path_join("/usr/share/factory", i.path);
2764 if (!i.argument)
2765 return log_oom();
2766
2767 } else if (!path_is_absolute(i.argument)) {
2768 *invalid_config = true;
2769 return log_syntax(NULL, LOG_ERR, fname, line, SYNTHETIC_ERRNO(EBADMSG), "Source path '%s' is not absolute.", i.argument);
2770
2771 }
2772
2773 if (!empty_or_root(arg_root)) {
2774 char *p;
2775
2776 p = path_join(arg_root, i.argument);
2777 if (!p)
2778 return log_oom();
2779 free_and_replace(i.argument, p);
2780 }
2781
2782 path_simplify(i.argument);
2783 break;
2784
2785 case CREATE_CHAR_DEVICE:
2786 case CREATE_BLOCK_DEVICE:
2787 if (!i.argument) {
2788 *invalid_config = true;
2789 return log_syntax(NULL, LOG_ERR, fname, line, SYNTHETIC_ERRNO(EBADMSG), "Device file requires argument.");
2790 }
2791
2792 r = parse_dev(i.argument, &i.major_minor);
2793 if (r < 0) {
2794 *invalid_config = true;
2795 return log_syntax(NULL, LOG_ERR, fname, line, r, "Can't parse device file major/minor '%s'.", i.argument);
2796 }
2797
2798 break;
2799
2800 case SET_XATTR:
2801 case RECURSIVE_SET_XATTR:
2802 if (!i.argument) {
2803 *invalid_config = true;
2804 return log_syntax(NULL, LOG_ERR, fname, line, SYNTHETIC_ERRNO(EBADMSG),
2805 "Set extended attribute requires argument.");
2806 }
2807 r = parse_xattrs_from_arg(&i);
2808 if (r < 0)
2809 return r;
2810 break;
2811
2812 case SET_ACL:
2813 case RECURSIVE_SET_ACL:
2814 if (!i.argument) {
2815 *invalid_config = true;
2816 return log_syntax(NULL, LOG_ERR, fname, line, SYNTHETIC_ERRNO(EBADMSG),
2817 "Set ACLs requires argument.");
2818 }
2819 r = parse_acls_from_arg(&i);
2820 if (r < 0)
2821 return r;
2822 break;
2823
2824 case SET_ATTRIBUTE:
2825 case RECURSIVE_SET_ATTRIBUTE:
2826 if (!i.argument) {
2827 *invalid_config = true;
2828 return log_syntax(NULL, LOG_ERR, fname, line, SYNTHETIC_ERRNO(EBADMSG),
2829 "Set file attribute requires argument.");
2830 }
2831 r = parse_attribute_from_arg(&i);
2832 if (IN_SET(r, -EINVAL, -EBADSLT))
2833 *invalid_config = true;
2834 if (r < 0)
2835 return r;
2836 break;
2837
2838 default:
2839 *invalid_config = true;
2840 return log_syntax(NULL, LOG_ERR, fname, line, SYNTHETIC_ERRNO(EBADMSG),
2841 "Unknown command type '%c'.", (char) i.type);
2842 }
2843
2844 if (!path_is_absolute(i.path)) {
2845 *invalid_config = true;
2846 return log_syntax(NULL, LOG_ERR, fname, line, SYNTHETIC_ERRNO(EBADMSG),
2847 "Path '%s' not absolute.", i.path);
2848 }
2849
2850 path_simplify(i.path);
2851
2852 if (!should_include_path(i.path))
2853 return 0;
2854
2855 r = specifier_expansion_from_arg(&i);
2856 if (r == -ENXIO)
2857 return log_unresolvable_specifier(fname, line);
2858 if (r < 0) {
2859 if (IN_SET(r, -EINVAL, -EBADSLT))
2860 *invalid_config = true;
2861 return log_syntax(NULL, LOG_ERR, fname, line, r, "Failed to substitute specifiers in argument: %m");
2862 }
2863
2864 if (!empty_or_root(arg_root)) {
2865 char *p;
2866
2867 p = path_join(arg_root, i.path);
2868 if (!p)
2869 return log_oom();
2870 free_and_replace(i.path, p);
2871 }
2872
2873 if (!empty_or_dash(user)) {
2874 r = find_uid(user, &i.uid, uid_cache);
2875 if (r < 0) {
2876 *invalid_config = true;
2877 return log_syntax(NULL, LOG_ERR, fname, line, r, "Failed to resolve user '%s': %m", user);
2878 }
2879
2880 i.uid_set = true;
2881 }
2882
2883 if (!empty_or_dash(group)) {
2884 r = find_gid(group, &i.gid, gid_cache);
2885 if (r < 0) {
2886 *invalid_config = true;
2887 return log_syntax(NULL, LOG_ERR, fname, line, r, "Failed to resolve group '%s'.", group);
2888 }
2889
2890 i.gid_set = true;
2891 }
2892
2893 if (!empty_or_dash(mode)) {
2894 const char *mm = mode;
2895 unsigned m;
2896
2897 if (*mm == '~') {
2898 i.mask_perms = true;
2899 mm++;
2900 }
2901
2902 r = parse_mode(mm, &m);
2903 if (r < 0) {
2904 *invalid_config = true;
2905 return log_syntax(NULL, LOG_ERR, fname, line, r, "Invalid mode '%s'.", mode);
2906 }
2907
2908 i.mode = m;
2909 i.mode_set = true;
2910 } else
2911 i.mode = IN_SET(i.type, CREATE_DIRECTORY, TRUNCATE_DIRECTORY, CREATE_SUBVOLUME, CREATE_SUBVOLUME_INHERIT_QUOTA, CREATE_SUBVOLUME_NEW_QUOTA) ? 0755 : 0644;
2912
2913 if (!empty_or_dash(age)) {
2914 const char *a = age;
2915
2916 if (*a == '~') {
2917 i.keep_first_level = true;
2918 a++;
2919 }
2920
2921 r = parse_sec(a, &i.age);
2922 if (r < 0) {
2923 *invalid_config = true;
2924 return log_syntax(NULL, LOG_ERR, fname, line, r, "Invalid age '%s'.", age);
2925 }
2926
2927 i.age_set = true;
2928 }
2929
2930 h = needs_glob(i.type) ? globs : items;
2931
2932 existing = ordered_hashmap_get(h, i.path);
2933 if (existing) {
2934 size_t n;
2935
2936 for (n = 0; n < existing->n_items; n++) {
2937 if (!item_compatible(existing->items + n, &i) && !i.append_or_force) {
2938 log_syntax(NULL, LOG_NOTICE, fname, line, 0, "Duplicate line for path \"%s\", ignoring.", i.path);
2939 return 0;
2940 }
2941 }
2942 } else {
2943 existing = new0(ItemArray, 1);
2944 if (!existing)
2945 return log_oom();
2946
2947 r = ordered_hashmap_put(h, i.path, existing);
2948 if (r < 0) {
2949 free(existing);
2950 return log_oom();
2951 }
2952 }
2953
2954 if (!GREEDY_REALLOC(existing->items, existing->n_items + 1))
2955 return log_oom();
2956
2957 existing->items[existing->n_items++] = i;
2958 i = (struct Item) {};
2959
2960 /* Sort item array, to enforce stable ordering of application */
2961 typesafe_qsort(existing->items, existing->n_items, item_compare);
2962
2963 return 0;
2964 }
2965
2966 static int cat_config(char **config_dirs, char **args) {
2967 _cleanup_strv_free_ char **files = NULL;
2968 int r;
2969
2970 r = conf_files_list_with_replacement(arg_root, config_dirs, arg_replace, &files, NULL);
2971 if (r < 0)
2972 return r;
2973
2974 return cat_files(NULL, files, 0);
2975 }
2976
2977 static int exclude_default_prefixes(void) {
2978 int r;
2979
2980 /* Provide an easy way to exclude virtual/memory file systems from what we do here. Useful in
2981 * combination with --root= where we probably don't want to apply stuff to these dirs as they are
2982 * likely over-mounted if the root directory is actually used, and it wouldbe less than ideal to have
2983 * all kinds of files created/adjusted underneath these mount points. */
2984
2985 r = strv_extend_strv(
2986 &arg_exclude_prefixes,
2987 STRV_MAKE("/dev",
2988 "/proc",
2989 "/run",
2990 "/sys"),
2991 true);
2992 if (r < 0)
2993 return log_oom();
2994
2995 return 0;
2996 }
2997
2998 static int help(void) {
2999 _cleanup_free_ char *link = NULL;
3000 int r;
3001
3002 r = terminal_urlify_man("systemd-tmpfiles", "8", &link);
3003 if (r < 0)
3004 return log_oom();
3005
3006 printf("%s [OPTIONS...] [CONFIGURATION FILE...]\n"
3007 "\n%sCreates, deletes and cleans up volatile and temporary files and directories.%s\n\n"
3008 " -h --help Show this help\n"
3009 " --user Execute user configuration\n"
3010 " --version Show package version\n"
3011 " --cat-config Show configuration files\n"
3012 " --create Create marked files/directories\n"
3013 " --clean Clean up marked directories\n"
3014 " --remove Remove marked files/directories\n"
3015 " --boot Execute actions only safe at boot\n"
3016 " --prefix=PATH Only apply rules with the specified prefix\n"
3017 " --exclude-prefix=PATH Ignore rules with the specified prefix\n"
3018 " -E Ignore rules prefixed with /dev, /proc, /run, /sys\n"
3019 " --root=PATH Operate on an alternate filesystem root\n"
3020 " --image=PATH Operate on disk image as filesystem root\n"
3021 " --replace=PATH Treat arguments as replacement for PATH\n"
3022 " --no-pager Do not pipe output into a pager\n"
3023 "\nSee the %s for details.\n",
3024 program_invocation_short_name,
3025 ansi_highlight(),
3026 ansi_normal(),
3027 link);
3028
3029 return 0;
3030 }
3031
3032 static int parse_argv(int argc, char *argv[]) {
3033
3034 enum {
3035 ARG_VERSION = 0x100,
3036 ARG_CAT_CONFIG,
3037 ARG_USER,
3038 ARG_CREATE,
3039 ARG_CLEAN,
3040 ARG_REMOVE,
3041 ARG_BOOT,
3042 ARG_PREFIX,
3043 ARG_EXCLUDE_PREFIX,
3044 ARG_ROOT,
3045 ARG_IMAGE,
3046 ARG_REPLACE,
3047 ARG_NO_PAGER,
3048 };
3049
3050 static const struct option options[] = {
3051 { "help", no_argument, NULL, 'h' },
3052 { "user", no_argument, NULL, ARG_USER },
3053 { "version", no_argument, NULL, ARG_VERSION },
3054 { "cat-config", no_argument, NULL, ARG_CAT_CONFIG },
3055 { "create", no_argument, NULL, ARG_CREATE },
3056 { "clean", no_argument, NULL, ARG_CLEAN },
3057 { "remove", no_argument, NULL, ARG_REMOVE },
3058 { "boot", no_argument, NULL, ARG_BOOT },
3059 { "prefix", required_argument, NULL, ARG_PREFIX },
3060 { "exclude-prefix", required_argument, NULL, ARG_EXCLUDE_PREFIX },
3061 { "root", required_argument, NULL, ARG_ROOT },
3062 { "image", required_argument, NULL, ARG_IMAGE },
3063 { "replace", required_argument, NULL, ARG_REPLACE },
3064 { "no-pager", no_argument, NULL, ARG_NO_PAGER },
3065 {}
3066 };
3067
3068 int c, r;
3069
3070 assert(argc >= 0);
3071 assert(argv);
3072
3073 while ((c = getopt_long(argc, argv, "hE", options, NULL)) >= 0)
3074
3075 switch (c) {
3076
3077 case 'h':
3078 return help();
3079
3080 case ARG_VERSION:
3081 return version();
3082
3083 case ARG_CAT_CONFIG:
3084 arg_cat_config = true;
3085 break;
3086
3087 case ARG_USER:
3088 arg_user = true;
3089 break;
3090
3091 case ARG_CREATE:
3092 arg_operation |= OPERATION_CREATE;
3093 break;
3094
3095 case ARG_CLEAN:
3096 arg_operation |= OPERATION_CLEAN;
3097 break;
3098
3099 case ARG_REMOVE:
3100 arg_operation |= OPERATION_REMOVE;
3101 break;
3102
3103 case ARG_BOOT:
3104 arg_boot = true;
3105 break;
3106
3107 case ARG_PREFIX:
3108 if (strv_push(&arg_include_prefixes, optarg) < 0)
3109 return log_oom();
3110 break;
3111
3112 case ARG_EXCLUDE_PREFIX:
3113 if (strv_push(&arg_exclude_prefixes, optarg) < 0)
3114 return log_oom();
3115 break;
3116
3117 case ARG_ROOT:
3118 r = parse_path_argument(optarg, /* suppress_root= */ false, &arg_root);
3119 if (r < 0)
3120 return r;
3121 break;
3122
3123 case ARG_IMAGE:
3124 #ifdef STANDALONE
3125 return log_error_errno(SYNTHETIC_ERRNO(EOPNOTSUPP),
3126 "This systemd-tmpfiles version is compiled without support for --image=.");
3127 #else
3128 r = parse_path_argument(optarg, /* suppress_root= */ false, &arg_image);
3129 if (r < 0)
3130 return r;
3131 #endif
3132 /* Imply -E here since it makes little sense to create files persistently in the /run mountpoint of a disk image */
3133 _fallthrough_;
3134
3135 case 'E':
3136 r = exclude_default_prefixes();
3137 if (r < 0)
3138 return r;
3139
3140 break;
3141
3142 case ARG_REPLACE:
3143 if (!path_is_absolute(optarg) ||
3144 !endswith(optarg, ".conf"))
3145 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
3146 "The argument to --replace= must an absolute path to a config file");
3147
3148 arg_replace = optarg;
3149 break;
3150
3151 case ARG_NO_PAGER:
3152 arg_pager_flags |= PAGER_DISABLE;
3153 break;
3154
3155 case '?':
3156 return -EINVAL;
3157
3158 default:
3159 assert_not_reached("Unhandled option");
3160 }
3161
3162 if (arg_operation == 0 && !arg_cat_config)
3163 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
3164 "You need to specify at least one of --clean, --create or --remove.");
3165
3166 if (arg_replace && arg_cat_config)
3167 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
3168 "Option --replace= is not supported with --cat-config");
3169
3170 if (arg_replace && optind >= argc)
3171 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
3172 "When --replace= is given, some configuration items must be specified");
3173
3174 if (arg_root && arg_user)
3175 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
3176 "Combination of --user and --root= is not supported.");
3177
3178 if (arg_image && arg_root)
3179 return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "Please specify either --root= or --image=, the combination of both is not supported.");
3180
3181 return 1;
3182 }
3183
3184 static int read_config_file(char **config_dirs, const char *fn, bool ignore_enoent, bool *invalid_config) {
3185 _cleanup_(hashmap_freep) Hashmap *uid_cache = NULL, *gid_cache = NULL;
3186 _cleanup_fclose_ FILE *_f = NULL;
3187 _cleanup_free_ char *pp = NULL;
3188 unsigned v = 0;
3189 FILE *f;
3190 ItemArray *ia;
3191 int r = 0;
3192
3193 assert(fn);
3194
3195 if (streq(fn, "-")) {
3196 log_debug("Reading config from stdin…");
3197 fn = "<stdin>";
3198 f = stdin;
3199 } else {
3200 r = search_and_fopen(fn, "re", arg_root, (const char**) config_dirs, &_f, &pp);
3201 if (r < 0) {
3202 if (ignore_enoent && r == -ENOENT) {
3203 log_debug_errno(r, "Failed to open \"%s\", ignoring: %m", fn);
3204 return 0;
3205 }
3206
3207 return log_error_errno(r, "Failed to open '%s': %m", fn);
3208 }
3209
3210 log_debug("Reading config file \"%s\"…", pp);
3211 fn = pp;
3212 f = _f;
3213 }
3214
3215 for (;;) {
3216 _cleanup_free_ char *line = NULL;
3217 bool invalid_line = false;
3218 char *l;
3219 int k;
3220
3221 k = read_line(f, LONG_LINE_MAX, &line);
3222 if (k < 0)
3223 return log_error_errno(k, "Failed to read '%s': %m", fn);
3224 if (k == 0)
3225 break;
3226
3227 v++;
3228
3229 l = strstrip(line);
3230 if (IN_SET(*l, 0, '#'))
3231 continue;
3232
3233 k = parse_line(fn, v, l, &invalid_line, &uid_cache, &gid_cache);
3234 if (k < 0) {
3235 if (invalid_line)
3236 /* Allow reporting with a special code if the caller requested this */
3237 *invalid_config = true;
3238 else if (r == 0)
3239 /* The first error becomes our return value */
3240 r = k;
3241 }
3242 }
3243
3244 /* we have to determine age parameter for each entry of type X */
3245 ORDERED_HASHMAP_FOREACH(ia, globs)
3246 for (size_t ni = 0; ni < ia->n_items; ni++) {
3247 ItemArray *ja;
3248 Item *i = ia->items + ni, *candidate_item = NULL;
3249
3250 if (i->type != IGNORE_DIRECTORY_PATH)
3251 continue;
3252
3253 ORDERED_HASHMAP_FOREACH(ja, items)
3254 for (size_t nj = 0; nj < ja->n_items; nj++) {
3255 Item *j = ja->items + nj;
3256
3257 if (!IN_SET(j->type, CREATE_DIRECTORY,
3258 TRUNCATE_DIRECTORY,
3259 CREATE_SUBVOLUME,
3260 CREATE_SUBVOLUME_INHERIT_QUOTA,
3261 CREATE_SUBVOLUME_NEW_QUOTA))
3262 continue;
3263
3264 if (path_equal(j->path, i->path)) {
3265 candidate_item = j;
3266 break;
3267 }
3268
3269 if (candidate_item
3270 ? (path_startswith(j->path, candidate_item->path) && fnmatch(i->path, j->path, FNM_PATHNAME | FNM_PERIOD) == 0)
3271 : path_startswith(i->path, j->path) != NULL)
3272 candidate_item = j;
3273 }
3274
3275 if (candidate_item && candidate_item->age_set) {
3276 i->age = candidate_item->age;
3277 i->age_set = true;
3278 }
3279 }
3280
3281 if (ferror(f)) {
3282 log_error_errno(errno, "Failed to read from file %s: %m", fn);
3283 if (r == 0)
3284 r = -EIO;
3285 }
3286
3287 return r;
3288 }
3289
3290 static int parse_arguments(char **config_dirs, char **args, bool *invalid_config) {
3291 char **arg;
3292 int r;
3293
3294 STRV_FOREACH(arg, args) {
3295 r = read_config_file(config_dirs, *arg, false, invalid_config);
3296 if (r < 0)
3297 return r;
3298 }
3299
3300 return 0;
3301 }
3302
3303 static int read_config_files(char **config_dirs, char **args, bool *invalid_config) {
3304 _cleanup_strv_free_ char **files = NULL;
3305 _cleanup_free_ char *p = NULL;
3306 char **f;
3307 int r;
3308
3309 r = conf_files_list_with_replacement(arg_root, config_dirs, arg_replace, &files, &p);
3310 if (r < 0)
3311 return r;
3312
3313 STRV_FOREACH(f, files)
3314 if (p && path_equal(*f, p)) {
3315 log_debug("Parsing arguments at position \"%s\"…", *f);
3316
3317 r = parse_arguments(config_dirs, args, invalid_config);
3318 if (r < 0)
3319 return r;
3320 } else
3321 /* Just warn, ignore result otherwise.
3322 * read_config_file() has some debug output, so no need to print anything. */
3323 (void) read_config_file(config_dirs, *f, true, invalid_config);
3324
3325 return 0;
3326 }
3327
3328 static int link_parent(ItemArray *a) {
3329 const char *path;
3330 char *prefix;
3331 int r;
3332
3333 assert(a);
3334
3335 /* Finds the closest "parent" item array for the specified item array. Then registers the specified item array
3336 * as child of it, and fills the parent in, linking them both ways. This allows us to later create parents
3337 * before their children, and clean up/remove children before their parents. */
3338
3339 if (a->n_items <= 0)
3340 return 0;
3341
3342 path = a->items[0].path;
3343 prefix = newa(char, strlen(path) + 1);
3344 PATH_FOREACH_PREFIX(prefix, path) {
3345 ItemArray *j;
3346
3347 j = ordered_hashmap_get(items, prefix);
3348 if (!j)
3349 j = ordered_hashmap_get(globs, prefix);
3350 if (j) {
3351 r = set_ensure_put(&j->children, NULL, a);
3352 if (r < 0)
3353 return log_oom();
3354
3355 a->parent = j;
3356 return 1;
3357 }
3358 }
3359
3360 return 0;
3361 }
3362
3363 DEFINE_PRIVATE_HASH_OPS_WITH_VALUE_DESTRUCTOR(item_array_hash_ops, char, string_hash_func, string_compare_func,
3364 ItemArray, item_array_free);
3365
3366 static int run(int argc, char *argv[]) {
3367 #ifndef STANDALONE
3368 _cleanup_(loop_device_unrefp) LoopDevice *loop_device = NULL;
3369 _cleanup_(decrypted_image_unrefp) DecryptedImage *decrypted_image = NULL;
3370 _cleanup_(umount_and_rmdir_and_freep) char *unlink_dir = NULL;
3371 #endif
3372 _cleanup_strv_free_ char **config_dirs = NULL;
3373 bool invalid_config = false;
3374 ItemArray *a;
3375 enum {
3376 PHASE_REMOVE_AND_CLEAN,
3377 PHASE_CREATE,
3378 _PHASE_MAX
3379 } phase;
3380 int r, k;
3381
3382 r = parse_argv(argc, argv);
3383 if (r <= 0)
3384 return r;
3385
3386 log_setup();
3387
3388 /* We require /proc/ for a lot of our operations, i.e. for adjusting access modes, for anything
3389 * SELinux related, for recursive operation, for xattr, acl and chattr handling, for btrfs stuff and
3390 * a lot more. It's probably the majority of invocations where /proc/ is required. Since people
3391 * apparently invoke it without anyway and are surprised about the failures, let's catch this early
3392 * and output a nice and friendly warning. */
3393 if (proc_mounted() == 0)
3394 return log_error_errno(SYNTHETIC_ERRNO(ENOSYS),
3395 "/proc/ is not mounted, but required for successful operation of systemd-tmpfiles. "
3396 "Please mount /proc/. Alternatively, consider using the --root= or --image= switches.");
3397
3398 /* Descending down file system trees might take a lot of fds */
3399 (void) rlimit_nofile_bump(HIGH_RLIMIT_NOFILE);
3400
3401 if (arg_user) {
3402 r = user_config_paths(&config_dirs);
3403 if (r < 0)
3404 return log_error_errno(r, "Failed to initialize configuration directory list: %m");
3405 } else {
3406 config_dirs = strv_split_nulstr(CONF_PATHS_NULSTR("tmpfiles.d"));
3407 if (!config_dirs)
3408 return log_oom();
3409 }
3410
3411 if (DEBUG_LOGGING) {
3412 _cleanup_free_ char *t = NULL;
3413 char **i;
3414
3415 STRV_FOREACH(i, config_dirs) {
3416 _cleanup_free_ char *j = NULL;
3417
3418 j = path_join(arg_root, *i);
3419 if (!j)
3420 return log_oom();
3421
3422 if (!strextend(&t, "\n\t", j))
3423 return log_oom();
3424 }
3425
3426 log_debug("Looking for configuration files in (higher priority first):%s", t);
3427 }
3428
3429 if (arg_cat_config) {
3430 (void) pager_open(arg_pager_flags);
3431
3432 return cat_config(config_dirs, argv + optind);
3433 }
3434
3435 umask(0022);
3436
3437 r = mac_selinux_init();
3438 if (r < 0)
3439 return r;
3440
3441 #ifndef STANDALONE
3442 if (arg_image) {
3443 assert(!arg_root);
3444
3445 r = mount_image_privately_interactively(
3446 arg_image,
3447 DISSECT_IMAGE_GENERIC_ROOT |
3448 DISSECT_IMAGE_REQUIRE_ROOT |
3449 DISSECT_IMAGE_VALIDATE_OS |
3450 DISSECT_IMAGE_RELAX_VAR_CHECK |
3451 DISSECT_IMAGE_FSCK |
3452 DISSECT_IMAGE_GROWFS,
3453 &unlink_dir,
3454 &loop_device,
3455 &decrypted_image);
3456 if (r < 0)
3457 return r;
3458
3459 arg_root = strdup(unlink_dir);
3460 if (!arg_root)
3461 return log_oom();
3462 }
3463 #else
3464 assert(!arg_image);
3465 #endif
3466
3467 items = ordered_hashmap_new(&item_array_hash_ops);
3468 globs = ordered_hashmap_new(&item_array_hash_ops);
3469 if (!items || !globs)
3470 return log_oom();
3471
3472 /* If command line arguments are specified along with --replace, read all
3473 * configuration files and insert the positional arguments at the specified
3474 * place. Otherwise, if command line arguments are specified, execute just
3475 * them, and finally, without --replace= or any positional arguments, just
3476 * read configuration and execute it.
3477 */
3478 if (arg_replace || optind >= argc)
3479 r = read_config_files(config_dirs, argv + optind, &invalid_config);
3480 else
3481 r = parse_arguments(config_dirs, argv + optind, &invalid_config);
3482 if (r < 0)
3483 return r;
3484
3485 /* Let's now link up all child/parent relationships */
3486 ORDERED_HASHMAP_FOREACH(a, items) {
3487 r = link_parent(a);
3488 if (r < 0)
3489 return r;
3490 }
3491 ORDERED_HASHMAP_FOREACH(a, globs) {
3492 r = link_parent(a);
3493 if (r < 0)
3494 return r;
3495 }
3496
3497 /* If multiple operations are requested, let's first run the remove/clean operations, and only then the create
3498 * operations. i.e. that we first clean out the platform we then build on. */
3499 for (phase = 0; phase < _PHASE_MAX; phase++) {
3500 OperationMask op;
3501
3502 if (phase == PHASE_REMOVE_AND_CLEAN)
3503 op = arg_operation & (OPERATION_REMOVE|OPERATION_CLEAN);
3504 else if (phase == PHASE_CREATE)
3505 op = arg_operation & OPERATION_CREATE;
3506 else
3507 assert_not_reached("unexpected phase");
3508
3509 if (op == 0) /* Nothing requested in this phase */
3510 continue;
3511
3512 /* The non-globbing ones usually create things, hence we apply them first */
3513 ORDERED_HASHMAP_FOREACH(a, items) {
3514 k = process_item_array(a, op);
3515 if (k < 0 && r >= 0)
3516 r = k;
3517 }
3518
3519 /* The globbing ones usually alter things, hence we apply them second. */
3520 ORDERED_HASHMAP_FOREACH(a, globs) {
3521 k = process_item_array(a, op);
3522 if (k < 0 && r >= 0)
3523 r = k;
3524 }
3525 }
3526
3527 if (ERRNO_IS_RESOURCE(r))
3528 return r;
3529 if (invalid_config)
3530 return EX_DATAERR;
3531 if (r < 0)
3532 return EX_CANTCREAT;
3533 return 0;
3534 }
3535
3536 DEFINE_MAIN_FUNCTION_WITH_POSITIVE_FAILURE(run);
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