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Merge pull request #17399 from afq984/udev-escaped-string
[thirdparty/systemd.git] / src / tmpfiles / tmpfiles.c
1 /* SPDX-License-Identifier: LGPL-2.1+ */
2
3 #include <errno.h>
4 #include <fcntl.h>
5 #include <fnmatch.h>
6 #include <getopt.h>
7 #include <limits.h>
8 #include <linux/fs.h>
9 #include <stdbool.h>
10 #include <stddef.h>
11 #include <stdlib.h>
12 #include <sys/file.h>
13 #include <sys/xattr.h>
14 #include <sysexits.h>
15 #include <time.h>
16 #include <unistd.h>
17
18 #include "sd-path.h"
19
20 #include "acl-util.h"
21 #include "alloc-util.h"
22 #include "btrfs-util.h"
23 #include "capability-util.h"
24 #include "chattr-util.h"
25 #include "conf-files.h"
26 #include "copy.h"
27 #include "def.h"
28 #include "dirent-util.h"
29 #include "dissect-image.h"
30 #include "escape.h"
31 #include "fd-util.h"
32 #include "fileio.h"
33 #include "format-util.h"
34 #include "fs-util.h"
35 #include "glob-util.h"
36 #include "io-util.h"
37 #include "label.h"
38 #include "log.h"
39 #include "macro.h"
40 #include "main-func.h"
41 #include "missing_stat.h"
42 #include "missing_syscall.h"
43 #include "mkdir.h"
44 #include "mount-util.h"
45 #include "mountpoint-util.h"
46 #include "offline-passwd.h"
47 #include "pager.h"
48 #include "parse-util.h"
49 #include "path-lookup.h"
50 #include "path-util.h"
51 #include "pretty-print.h"
52 #include "rlimit-util.h"
53 #include "rm-rf.h"
54 #include "selinux-util.h"
55 #include "set.h"
56 #include "sort-util.h"
57 #include "specifier.h"
58 #include "stat-util.h"
59 #include "stdio-util.h"
60 #include "string-table.h"
61 #include "string-util.h"
62 #include "strv.h"
63 #include "umask-util.h"
64 #include "user-util.h"
65
66 /* This reads all files listed in /etc/tmpfiles.d/?*.conf and creates
67 * them in the file system. This is intended to be used to create
68 * properly owned directories beneath /tmp, /var/tmp, /run, which are
69 * volatile and hence need to be recreated on bootup. */
70
71 typedef enum OperationMask {
72 OPERATION_CREATE = 1 << 0,
73 OPERATION_REMOVE = 1 << 1,
74 OPERATION_CLEAN = 1 << 2,
75 } OperationMask;
76
77 typedef enum ItemType {
78 /* These ones take file names */
79 CREATE_FILE = 'f',
80 TRUNCATE_FILE = 'F', /* deprecated: use f+ */
81 CREATE_DIRECTORY = 'd',
82 TRUNCATE_DIRECTORY = 'D',
83 CREATE_SUBVOLUME = 'v',
84 CREATE_SUBVOLUME_INHERIT_QUOTA = 'q',
85 CREATE_SUBVOLUME_NEW_QUOTA = 'Q',
86 CREATE_FIFO = 'p',
87 CREATE_SYMLINK = 'L',
88 CREATE_CHAR_DEVICE = 'c',
89 CREATE_BLOCK_DEVICE = 'b',
90 COPY_FILES = 'C',
91
92 /* These ones take globs */
93 WRITE_FILE = 'w',
94 EMPTY_DIRECTORY = 'e',
95 SET_XATTR = 't',
96 RECURSIVE_SET_XATTR = 'T',
97 SET_ACL = 'a',
98 RECURSIVE_SET_ACL = 'A',
99 SET_ATTRIBUTE = 'h',
100 RECURSIVE_SET_ATTRIBUTE = 'H',
101 IGNORE_PATH = 'x',
102 IGNORE_DIRECTORY_PATH = 'X',
103 REMOVE_PATH = 'r',
104 RECURSIVE_REMOVE_PATH = 'R',
105 RELABEL_PATH = 'z',
106 RECURSIVE_RELABEL_PATH = 'Z',
107 ADJUST_MODE = 'm', /* legacy, 'z' is identical to this */
108 } ItemType;
109
110 typedef struct Item {
111 ItemType type;
112
113 char *path;
114 char *argument;
115 char **xattrs;
116 #if HAVE_ACL
117 acl_t acl_access;
118 acl_t acl_default;
119 #endif
120 uid_t uid;
121 gid_t gid;
122 mode_t mode;
123 usec_t age;
124
125 dev_t major_minor;
126 unsigned attribute_value;
127 unsigned attribute_mask;
128
129 bool uid_set:1;
130 bool gid_set:1;
131 bool mode_set:1;
132 bool age_set:1;
133 bool mask_perms:1;
134 bool attribute_set:1;
135
136 bool keep_first_level:1;
137
138 bool append_or_force:1;
139
140 bool allow_failure:1;
141
142 OperationMask done;
143 } Item;
144
145 typedef struct ItemArray {
146 Item *items;
147 size_t n_items;
148 size_t allocated;
149
150 struct ItemArray *parent;
151 Set *children;
152 } ItemArray;
153
154 typedef enum DirectoryType {
155 DIRECTORY_RUNTIME,
156 DIRECTORY_STATE,
157 DIRECTORY_CACHE,
158 DIRECTORY_LOGS,
159 _DIRECTORY_TYPE_MAX,
160 } DirectoryType;
161
162 static bool arg_cat_config = false;
163 static bool arg_user = false;
164 static OperationMask arg_operation = 0;
165 static bool arg_boot = false;
166 static PagerFlags arg_pager_flags = 0;
167
168 static char **arg_include_prefixes = NULL;
169 static char **arg_exclude_prefixes = NULL;
170 static char *arg_root = NULL;
171 static char *arg_image = NULL;
172 static char *arg_replace = NULL;
173
174 #define MAX_DEPTH 256
175
176 static OrderedHashmap *items = NULL, *globs = NULL;
177 static Set *unix_sockets = NULL;
178
179 STATIC_DESTRUCTOR_REGISTER(items, ordered_hashmap_freep);
180 STATIC_DESTRUCTOR_REGISTER(globs, ordered_hashmap_freep);
181 STATIC_DESTRUCTOR_REGISTER(unix_sockets, set_free_freep);
182 STATIC_DESTRUCTOR_REGISTER(arg_include_prefixes, freep);
183 STATIC_DESTRUCTOR_REGISTER(arg_exclude_prefixes, freep);
184 STATIC_DESTRUCTOR_REGISTER(arg_root, freep);
185 STATIC_DESTRUCTOR_REGISTER(arg_image, freep);
186
187 static int specifier_machine_id_safe(char specifier, const void *data, const void *userdata, char **ret);
188 static int specifier_directory(char specifier, const void *data, const void *userdata, char **ret);
189
190 static const Specifier specifier_table[] = {
191 { 'm', specifier_machine_id_safe, NULL },
192 { 'b', specifier_boot_id, NULL },
193 { 'H', specifier_host_name, NULL },
194 { 'l', specifier_short_host_name, NULL },
195 { 'v', specifier_kernel_release, NULL },
196 { 'a', specifier_architecture, NULL },
197 { 'o', specifier_os_id, NULL },
198 { 'w', specifier_os_version_id, NULL },
199 { 'B', specifier_os_build_id, NULL },
200 { 'W', specifier_os_variant_id, NULL },
201
202 { 'g', specifier_group_name, NULL },
203 { 'G', specifier_group_id, NULL },
204 { 'U', specifier_user_id, NULL },
205 { 'u', specifier_user_name, NULL },
206 { 'h', specifier_user_home, NULL },
207
208 { 't', specifier_directory, UINT_TO_PTR(DIRECTORY_RUNTIME) },
209 { 'S', specifier_directory, UINT_TO_PTR(DIRECTORY_STATE) },
210 { 'C', specifier_directory, UINT_TO_PTR(DIRECTORY_CACHE) },
211 { 'L', specifier_directory, UINT_TO_PTR(DIRECTORY_LOGS) },
212 { 'T', specifier_tmp_dir, NULL },
213 { 'V', specifier_var_tmp_dir, NULL },
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, false);
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 r = chattr_fd(procfs_fd, f, item->attribute_mask, NULL);
1314 if (r < 0)
1315 log_full_errno(IN_SET(r, -ENOTTY, -EOPNOTSUPP) ? LOG_DEBUG : LOG_WARNING,
1316 r,
1317 "Cannot set file attribute for '%s', value=0x%08x, mask=0x%08x, ignoring: %m",
1318 path, item->attribute_value, item->attribute_mask);
1319
1320 return 0;
1321 }
1322
1323 static int path_set_attribute(Item *item, const char *path) {
1324 _cleanup_close_ int fd = -1;
1325
1326 if (!item->attribute_set || item->attribute_mask == 0)
1327 return 0;
1328
1329 fd = path_open_safe(path);
1330 if (fd < 0)
1331 return fd;
1332
1333 return fd_set_attribute(item, fd, path, NULL);
1334 }
1335
1336 static int write_one_file(Item *i, const char *path) {
1337 _cleanup_close_ int fd = -1, dir_fd = -1;
1338 char *bn;
1339 int r;
1340
1341 assert(i);
1342 assert(path);
1343 assert(i->argument);
1344 assert(i->type == WRITE_FILE);
1345
1346 /* Validate the path and keep the fd on the directory for opening the
1347 * file so we're sure that it can't be changed behind our back. */
1348 dir_fd = path_open_parent_safe(path);
1349 if (dir_fd < 0)
1350 return dir_fd;
1351
1352 bn = basename(path);
1353
1354 /* Follows symlinks */
1355 fd = openat(dir_fd, bn,
1356 O_NONBLOCK|O_CLOEXEC|O_WRONLY|O_NOCTTY|(i->append_or_force ? O_APPEND : 0),
1357 i->mode);
1358 if (fd < 0) {
1359 if (errno == ENOENT) {
1360 log_debug_errno(errno, "Not writing missing file \"%s\": %m", path);
1361 return 0;
1362 }
1363
1364 if (i->allow_failure)
1365 return log_debug_errno(errno, "Failed to open file \"%s\", ignoring: %m", path);
1366
1367 return log_error_errno(errno, "Failed to open file \"%s\": %m", path);
1368 }
1369
1370 /* 'w' is allowed to write into any kind of files. */
1371 log_debug("Writing to \"%s\".", path);
1372
1373 r = loop_write(fd, i->argument, strlen(i->argument), false);
1374 if (r < 0)
1375 return log_error_errno(r, "Failed to write file \"%s\": %m", path);
1376
1377 return fd_set_perms(i, fd, path, NULL);
1378 }
1379
1380 static int create_file(Item *i, const char *path) {
1381 _cleanup_close_ int fd = -1, dir_fd = -1;
1382 struct stat stbuf, *st = NULL;
1383 int r = 0;
1384 char *bn;
1385
1386 assert(i);
1387 assert(path);
1388 assert(i->type == CREATE_FILE);
1389
1390 /* 'f' operates on regular files exclusively. */
1391
1392 /* Validate the path and keep the fd on the directory for opening the
1393 * file so we're sure that it can't be changed behind our back. */
1394 dir_fd = path_open_parent_safe(path);
1395 if (dir_fd < 0)
1396 return dir_fd;
1397
1398 bn = basename(path);
1399
1400 RUN_WITH_UMASK(0000) {
1401 mac_selinux_create_file_prepare(path, S_IFREG);
1402 fd = openat(dir_fd, bn, O_CREAT|O_EXCL|O_NOFOLLOW|O_NONBLOCK|O_CLOEXEC|O_WRONLY|O_NOCTTY, i->mode);
1403 mac_selinux_create_file_clear();
1404 }
1405
1406 if (fd < 0) {
1407 /* Even on a read-only filesystem, open(2) returns EEXIST if the
1408 * file already exists. It returns EROFS only if it needs to
1409 * create the file. */
1410 if (errno != EEXIST)
1411 return log_error_errno(errno, "Failed to create file %s: %m", path);
1412
1413 /* Re-open the file. At that point it must exist since open(2)
1414 * failed with EEXIST. We still need to check if the perms/mode
1415 * need to be changed. For read-only filesystems, we let
1416 * fd_set_perms() report the error if the perms need to be
1417 * modified. */
1418 fd = openat(dir_fd, bn, O_NOFOLLOW|O_CLOEXEC|O_PATH, i->mode);
1419 if (fd < 0)
1420 return log_error_errno(errno, "Failed to re-open file %s: %m", path);
1421
1422 if (fstat(fd, &stbuf) < 0)
1423 return log_error_errno(errno, "stat(%s) failed: %m", path);
1424
1425 if (!S_ISREG(stbuf.st_mode))
1426 return log_error_errno(SYNTHETIC_ERRNO(EEXIST),
1427 "%s exists and is not a regular file.",
1428 path);
1429
1430 st = &stbuf;
1431 } else {
1432
1433 log_debug("\"%s\" has been created.", path);
1434
1435 if (i->argument) {
1436 log_debug("Writing to \"%s\".", path);
1437
1438 r = loop_write(fd, i->argument, strlen(i->argument), false);
1439 if (r < 0)
1440 return log_error_errno(r, "Failed to write file \"%s\": %m", path);
1441 }
1442 }
1443
1444 return fd_set_perms(i, fd, path, st);
1445 }
1446
1447 static int truncate_file(Item *i, const char *path) {
1448 _cleanup_close_ int fd = -1, dir_fd = -1;
1449 struct stat stbuf, *st = NULL;
1450 bool erofs = false;
1451 int r = 0;
1452 char *bn;
1453
1454 assert(i);
1455 assert(path);
1456 assert(i->type == TRUNCATE_FILE || (i->type == CREATE_FILE && i->append_or_force));
1457
1458 /* We want to operate on regular file exclusively especially since
1459 * O_TRUNC is unspecified if the file is neither a regular file nor a
1460 * fifo nor a terminal device. Therefore we first open the file and make
1461 * sure it's a regular one before truncating it. */
1462
1463 /* Validate the path and keep the fd on the directory for opening the
1464 * file so we're sure that it can't be changed behind our back. */
1465 dir_fd = path_open_parent_safe(path);
1466 if (dir_fd < 0)
1467 return dir_fd;
1468
1469 bn = basename(path);
1470
1471 RUN_WITH_UMASK(0000) {
1472 mac_selinux_create_file_prepare(path, S_IFREG);
1473 fd = openat(dir_fd, bn, O_CREAT|O_NOFOLLOW|O_NONBLOCK|O_CLOEXEC|O_WRONLY|O_NOCTTY, i->mode);
1474 mac_selinux_create_file_clear();
1475 }
1476
1477 if (fd < 0) {
1478 if (errno != EROFS)
1479 return log_error_errno(errno, "Failed to open/create file %s: %m", path);
1480
1481 /* On a read-only filesystem, we don't want to fail if the
1482 * target is already empty and the perms are set. So we still
1483 * proceed with the sanity checks and let the remaining
1484 * operations fail with EROFS if they try to modify the target
1485 * file. */
1486
1487 fd = openat(dir_fd, bn, O_NOFOLLOW|O_CLOEXEC|O_PATH, i->mode);
1488 if (fd < 0) {
1489 if (errno == ENOENT)
1490 return log_error_errno(SYNTHETIC_ERRNO(EROFS),
1491 "Cannot create file %s on a read-only file system.",
1492 path);
1493
1494 return log_error_errno(errno, "Failed to re-open file %s: %m", path);
1495 }
1496
1497 erofs = true;
1498 }
1499
1500 if (fstat(fd, &stbuf) < 0)
1501 return log_error_errno(errno, "stat(%s) failed: %m", path);
1502
1503 if (!S_ISREG(stbuf.st_mode))
1504 return log_error_errno(SYNTHETIC_ERRNO(EEXIST),
1505 "%s exists and is not a regular file.",
1506 path);
1507
1508 if (stbuf.st_size > 0) {
1509 if (ftruncate(fd, 0) < 0) {
1510 r = erofs ? -EROFS : -errno;
1511 return log_error_errno(r, "Failed to truncate file %s: %m", path);
1512 }
1513 } else
1514 st = &stbuf;
1515
1516 log_debug("\"%s\" has been created.", path);
1517
1518 if (i->argument) {
1519 log_debug("Writing to \"%s\".", path);
1520
1521 r = loop_write(fd, i->argument, strlen(i->argument), false);
1522 if (r < 0) {
1523 r = erofs ? -EROFS : r;
1524 return log_error_errno(r, "Failed to write file %s: %m", path);
1525 }
1526 }
1527
1528 return fd_set_perms(i, fd, path, st);
1529 }
1530
1531 static int copy_files(Item *i) {
1532 _cleanup_close_ int dfd = -1, fd = -1;
1533 char *bn;
1534 int r;
1535
1536 log_debug("Copying tree \"%s\" to \"%s\".", i->argument, i->path);
1537
1538 bn = basename(i->path);
1539
1540 /* Validate the path and use the returned directory fd for copying the
1541 * target so we're sure that the path can't be changed behind our
1542 * back. */
1543 dfd = path_open_parent_safe(i->path);
1544 if (dfd < 0)
1545 return dfd;
1546
1547 r = copy_tree_at(AT_FDCWD, i->argument,
1548 dfd, bn,
1549 i->uid_set ? i->uid : UID_INVALID,
1550 i->gid_set ? i->gid : GID_INVALID,
1551 COPY_REFLINK | COPY_MERGE_EMPTY | COPY_MAC_CREATE | COPY_HARDLINKS);
1552 if (r < 0) {
1553 struct stat a, b;
1554
1555 /* If the target already exists on read-only filesystems, trying
1556 * to create the target will not fail with EEXIST but with
1557 * EROFS. */
1558 if (r == -EROFS && faccessat(dfd, bn, F_OK, AT_SYMLINK_NOFOLLOW) == 0)
1559 r = -EEXIST;
1560
1561 if (r != -EEXIST)
1562 return log_error_errno(r, "Failed to copy files to %s: %m", i->path);
1563
1564 if (stat(i->argument, &a) < 0)
1565 return log_error_errno(errno, "stat(%s) failed: %m", i->argument);
1566
1567 if (fstatat(dfd, bn, &b, AT_SYMLINK_NOFOLLOW) < 0)
1568 return log_error_errno(errno, "stat(%s) failed: %m", i->path);
1569
1570 if ((a.st_mode ^ b.st_mode) & S_IFMT) {
1571 log_debug("Can't copy to %s, file exists already and is of different type", i->path);
1572 return 0;
1573 }
1574 }
1575
1576 fd = openat(dfd, bn, O_NOFOLLOW|O_CLOEXEC|O_PATH);
1577 if (fd < 0)
1578 return log_error_errno(errno, "Failed to openat(%s): %m", i->path);
1579
1580 return fd_set_perms(i, fd, i->path, NULL);
1581 }
1582
1583 typedef enum {
1584 CREATION_NORMAL,
1585 CREATION_EXISTING,
1586 CREATION_FORCE,
1587 _CREATION_MODE_MAX,
1588 _CREATION_MODE_INVALID = -1
1589 } CreationMode;
1590
1591 static const char *const creation_mode_verb_table[_CREATION_MODE_MAX] = {
1592 [CREATION_NORMAL] = "Created",
1593 [CREATION_EXISTING] = "Found existing",
1594 [CREATION_FORCE] = "Created replacement",
1595 };
1596
1597 DEFINE_PRIVATE_STRING_TABLE_LOOKUP_TO_STRING(creation_mode_verb, CreationMode);
1598
1599 static int create_directory_or_subvolume(const char *path, mode_t mode, bool subvol, CreationMode *creation) {
1600 _cleanup_close_ int pfd = -1;
1601 CreationMode c;
1602 int r;
1603
1604 assert(path);
1605
1606 if (!creation)
1607 creation = &c;
1608
1609 pfd = path_open_parent_safe(path);
1610 if (pfd < 0)
1611 return pfd;
1612
1613 if (subvol) {
1614 if (btrfs_is_subvol(empty_to_root(arg_root)) <= 0)
1615
1616 /* Don't create a subvolume unless the root directory is
1617 * one, too. We do this under the assumption that if the
1618 * root directory is just a plain directory (i.e. very
1619 * light-weight), we shouldn't try to split it up into
1620 * subvolumes (i.e. more heavy-weight). Thus, chroot()
1621 * environments and suchlike will get a full brtfs
1622 * subvolume set up below their tree only if they
1623 * specifically set up a btrfs subvolume for the root
1624 * dir too. */
1625
1626 subvol = false;
1627 else {
1628 RUN_WITH_UMASK((~mode) & 0777)
1629 r = btrfs_subvol_make_fd(pfd, basename(path));
1630 }
1631 } else
1632 r = 0;
1633
1634 if (!subvol || r == -ENOTTY)
1635 RUN_WITH_UMASK(0000)
1636 r = mkdirat_label(pfd, basename(path), mode);
1637
1638 if (r < 0) {
1639 int k;
1640
1641 if (!IN_SET(r, -EEXIST, -EROFS))
1642 return log_error_errno(r, "Failed to create directory or subvolume \"%s\": %m", path);
1643
1644 k = is_dir_fd(pfd);
1645 if (k == -ENOENT && r == -EROFS)
1646 return log_error_errno(r, "%s does not exist and cannot be created as the file system is read-only.", path);
1647 if (k < 0)
1648 return log_error_errno(k, "Failed to check if %s exists: %m", path);
1649 if (!k) {
1650 log_warning("\"%s\" already exists and is not a directory.", path);
1651 return -EEXIST;
1652 }
1653
1654 *creation = CREATION_EXISTING;
1655 } else
1656 *creation = CREATION_NORMAL;
1657
1658 log_debug("%s directory \"%s\".", creation_mode_verb_to_string(*creation), path);
1659
1660 r = openat(pfd, basename(path), O_NOCTTY|O_CLOEXEC|O_DIRECTORY);
1661 if (r < 0)
1662 return log_error_errno(errno, "Failed to open directory '%s': %m", basename(path));
1663
1664 return r;
1665 }
1666
1667 static int create_directory(Item *i, const char *path) {
1668 _cleanup_close_ int fd = -1;
1669
1670 assert(i);
1671 assert(IN_SET(i->type, CREATE_DIRECTORY, TRUNCATE_DIRECTORY));
1672
1673 fd = create_directory_or_subvolume(path, i->mode, false, NULL);
1674 if (fd == -EEXIST)
1675 return 0;
1676 if (fd < 0)
1677 return fd;
1678
1679 return fd_set_perms(i, fd, path, NULL);
1680 }
1681
1682 static int create_subvolume(Item *i, const char *path) {
1683 _cleanup_close_ int fd = -1;
1684 CreationMode creation;
1685 int r, q = 0;
1686
1687 assert(i);
1688 assert(IN_SET(i->type, CREATE_SUBVOLUME, CREATE_SUBVOLUME_NEW_QUOTA, CREATE_SUBVOLUME_INHERIT_QUOTA));
1689
1690 fd = create_directory_or_subvolume(path, i->mode, true, &creation);
1691 if (fd == -EEXIST)
1692 return 0;
1693 if (fd < 0)
1694 return fd;
1695
1696 if (creation == CREATION_NORMAL &&
1697 IN_SET(i->type, CREATE_SUBVOLUME_NEW_QUOTA, CREATE_SUBVOLUME_INHERIT_QUOTA)) {
1698 r = btrfs_subvol_auto_qgroup_fd(fd, 0, i->type == CREATE_SUBVOLUME_NEW_QUOTA);
1699 if (r == -ENOTTY)
1700 log_debug_errno(r, "Couldn't adjust quota for subvolume \"%s\" (unsupported fs or dir not a subvolume): %m", i->path);
1701 else if (r == -EROFS)
1702 log_debug_errno(r, "Couldn't adjust quota for subvolume \"%s\" (fs is read-only).", i->path);
1703 else if (r == -ENOTCONN)
1704 log_debug_errno(r, "Couldn't adjust quota for subvolume \"%s\" (quota support is disabled).", i->path);
1705 else if (r < 0)
1706 q = log_error_errno(r, "Failed to adjust quota for subvolume \"%s\": %m", i->path);
1707 else if (r > 0)
1708 log_debug("Adjusted quota for subvolume \"%s\".", i->path);
1709 else if (r == 0)
1710 log_debug("Quota for subvolume \"%s\" already in place, no change made.", i->path);
1711 }
1712
1713 r = fd_set_perms(i, fd, path, NULL);
1714 if (q < 0) /* prefer the quota change error from above */
1715 return q;
1716
1717 return r;
1718 }
1719
1720 static int empty_directory(Item *i, const char *path) {
1721 int r;
1722
1723 assert(i);
1724 assert(i->type == EMPTY_DIRECTORY);
1725
1726 r = is_dir(path, false);
1727 if (r == -ENOENT) {
1728 /* Option "e" operates only on existing objects. Do not
1729 * print errors about non-existent files or directories */
1730 log_debug("Skipping missing directory: %s", path);
1731 return 0;
1732 }
1733 if (r < 0)
1734 return log_error_errno(r, "is_dir() failed on path %s: %m", path);
1735 if (r == 0)
1736 return log_error_errno(SYNTHETIC_ERRNO(EEXIST),
1737 "'%s' already exists and is not a directory.",
1738 path);
1739
1740 return path_set_perms(i, path);
1741 }
1742
1743 static int create_device(Item *i, mode_t file_type) {
1744 _cleanup_close_ int dfd = -1, fd = -1;
1745 CreationMode creation;
1746 char *bn;
1747 int r;
1748
1749 assert(i);
1750 assert(IN_SET(file_type, S_IFBLK, S_IFCHR));
1751
1752 bn = basename(i->path);
1753
1754 /* Validate the path and use the returned directory fd for copying the
1755 * target so we're sure that the path can't be changed behind our
1756 * back. */
1757 dfd = path_open_parent_safe(i->path);
1758 if (dfd < 0)
1759 return dfd;
1760
1761 RUN_WITH_UMASK(0000) {
1762 mac_selinux_create_file_prepare(i->path, file_type);
1763 r = mknodat(dfd, bn, i->mode | file_type, i->major_minor);
1764 mac_selinux_create_file_clear();
1765 }
1766
1767 if (r < 0) {
1768 struct stat st;
1769
1770 if (errno == EPERM) {
1771 log_debug("We lack permissions, possibly because of cgroup configuration; "
1772 "skipping creation of device node %s.", i->path);
1773 return 0;
1774 }
1775
1776 if (errno != EEXIST)
1777 return log_error_errno(errno, "Failed to create device node %s: %m", i->path);
1778
1779 if (fstatat(dfd, bn, &st, 0) < 0)
1780 return log_error_errno(errno, "stat(%s) failed: %m", i->path);
1781
1782 if ((st.st_mode & S_IFMT) != file_type) {
1783
1784 if (i->append_or_force) {
1785
1786 RUN_WITH_UMASK(0000) {
1787 mac_selinux_create_file_prepare(i->path, file_type);
1788 /* FIXME: need to introduce mknodat_atomic() */
1789 r = mknod_atomic(i->path, i->mode | file_type, i->major_minor);
1790 mac_selinux_create_file_clear();
1791 }
1792
1793 if (r < 0)
1794 return log_error_errno(r, "Failed to create device node \"%s\": %m", i->path);
1795 creation = CREATION_FORCE;
1796 } else {
1797 log_debug("%s is not a device node.", i->path);
1798 return 0;
1799 }
1800 } else
1801 creation = CREATION_EXISTING;
1802 } else
1803 creation = CREATION_NORMAL;
1804
1805 log_debug("%s %s device node \"%s\" %u:%u.",
1806 creation_mode_verb_to_string(creation),
1807 i->type == CREATE_BLOCK_DEVICE ? "block" : "char",
1808 i->path, major(i->mode), minor(i->mode));
1809
1810 fd = openat(dfd, bn, O_NOFOLLOW|O_CLOEXEC|O_PATH);
1811 if (fd < 0)
1812 return log_error_errno(errno, "Failed to openat(%s): %m", i->path);
1813
1814 return fd_set_perms(i, fd, i->path, NULL);
1815 }
1816
1817 static int create_fifo(Item *i, const char *path) {
1818 _cleanup_close_ int pfd = -1, fd = -1;
1819 CreationMode creation;
1820 struct stat st;
1821 char *bn;
1822 int r;
1823
1824 pfd = path_open_parent_safe(path);
1825 if (pfd < 0)
1826 return pfd;
1827
1828 bn = basename(path);
1829
1830 RUN_WITH_UMASK(0000) {
1831 mac_selinux_create_file_prepare(path, S_IFIFO);
1832 r = mkfifoat(pfd, bn, i->mode);
1833 mac_selinux_create_file_clear();
1834 }
1835
1836 if (r < 0) {
1837 if (errno != EEXIST)
1838 return log_error_errno(errno, "Failed to create fifo %s: %m", path);
1839
1840 if (fstatat(pfd, bn, &st, AT_SYMLINK_NOFOLLOW) < 0)
1841 return log_error_errno(errno, "stat(%s) failed: %m", path);
1842
1843 if (!S_ISFIFO(st.st_mode)) {
1844
1845 if (i->append_or_force) {
1846 RUN_WITH_UMASK(0000) {
1847 mac_selinux_create_file_prepare(path, S_IFIFO);
1848 r = mkfifoat_atomic(pfd, bn, i->mode);
1849 mac_selinux_create_file_clear();
1850 }
1851
1852 if (r < 0)
1853 return log_error_errno(r, "Failed to create fifo %s: %m", path);
1854 creation = CREATION_FORCE;
1855 } else {
1856 log_warning("\"%s\" already exists and is not a fifo.", path);
1857 return 0;
1858 }
1859 } else
1860 creation = CREATION_EXISTING;
1861 } else
1862 creation = CREATION_NORMAL;
1863
1864 log_debug("%s fifo \"%s\".", creation_mode_verb_to_string(creation), path);
1865
1866 fd = openat(pfd, bn, O_NOFOLLOW|O_CLOEXEC|O_PATH);
1867 if (fd < 0)
1868 return log_error_errno(errno, "Failed to openat(%s): %m", path);
1869
1870 return fd_set_perms(i, fd, i->path, NULL);
1871 }
1872
1873 typedef int (*action_t)(Item *i, const char *path);
1874 typedef int (*fdaction_t)(Item *i, int fd, const char *path, const struct stat *st);
1875
1876 static int item_do(Item *i, int fd, const char *path, fdaction_t action) {
1877 struct stat st;
1878 int r = 0, q;
1879
1880 assert(i);
1881 assert(path);
1882 assert(fd >= 0);
1883
1884 if (fstat(fd, &st) < 0) {
1885 r = log_error_errno(errno, "fstat() on file failed: %m");
1886 goto finish;
1887 }
1888
1889 /* This returns the first error we run into, but nevertheless
1890 * tries to go on */
1891 r = action(i, fd, path, &st);
1892
1893 if (S_ISDIR(st.st_mode)) {
1894 char procfs_path[STRLEN("/proc/self/fd/") + DECIMAL_STR_MAX(int)];
1895 _cleanup_closedir_ DIR *d = NULL;
1896 struct dirent *de;
1897
1898 /* The passed 'fd' was opened with O_PATH. We need to convert
1899 * it into a 'regular' fd before reading the directory content. */
1900 xsprintf(procfs_path, "/proc/self/fd/%i", fd);
1901
1902 d = opendir(procfs_path);
1903 if (!d) {
1904 log_error_errno(errno, "Failed to opendir() '%s': %m", procfs_path);
1905 if (r == 0)
1906 r = -errno;
1907 goto finish;
1908 }
1909
1910 FOREACH_DIRENT_ALL(de, d, q = -errno; goto finish) {
1911 int de_fd;
1912
1913 if (dot_or_dot_dot(de->d_name))
1914 continue;
1915
1916 de_fd = openat(fd, de->d_name, O_NOFOLLOW|O_CLOEXEC|O_PATH);
1917 if (de_fd < 0)
1918 q = log_error_errno(errno, "Failed to open() file '%s': %m", de->d_name);
1919 else {
1920 _cleanup_free_ char *de_path = NULL;
1921
1922 de_path = path_join(path, de->d_name);
1923 if (!de_path)
1924 q = log_oom();
1925 else
1926 /* Pass ownership of dirent fd over */
1927 q = item_do(i, de_fd, de_path, action);
1928 }
1929
1930 if (q < 0 && r == 0)
1931 r = q;
1932 }
1933 }
1934 finish:
1935 safe_close(fd);
1936 return r;
1937 }
1938
1939 static int glob_item(Item *i, action_t action) {
1940 _cleanup_globfree_ glob_t g = {
1941 .gl_opendir = (void *(*)(const char *)) opendir_nomod,
1942 };
1943 int r = 0, k;
1944 char **fn;
1945
1946 k = safe_glob(i->path, GLOB_NOSORT|GLOB_BRACE, &g);
1947 if (k < 0 && k != -ENOENT)
1948 return log_error_errno(k, "glob(%s) failed: %m", i->path);
1949
1950 STRV_FOREACH(fn, g.gl_pathv) {
1951 k = action(i, *fn);
1952 if (k < 0 && r == 0)
1953 r = k;
1954 }
1955
1956 return r;
1957 }
1958
1959 static int glob_item_recursively(Item *i, fdaction_t action) {
1960 _cleanup_globfree_ glob_t g = {
1961 .gl_opendir = (void *(*)(const char *)) opendir_nomod,
1962 };
1963 int r = 0, k;
1964 char **fn;
1965
1966 k = safe_glob(i->path, GLOB_NOSORT|GLOB_BRACE, &g);
1967 if (k < 0 && k != -ENOENT)
1968 return log_error_errno(k, "glob(%s) failed: %m", i->path);
1969
1970 STRV_FOREACH(fn, g.gl_pathv) {
1971 _cleanup_close_ int fd = -1;
1972
1973 /* Make sure we won't trigger/follow file object (such as
1974 * device nodes, automounts, ...) pointed out by 'fn' with
1975 * O_PATH. Note, when O_PATH is used, flags other than
1976 * O_CLOEXEC, O_DIRECTORY, and O_NOFOLLOW are ignored. */
1977
1978 fd = open(*fn, O_CLOEXEC|O_NOFOLLOW|O_PATH);
1979 if (fd < 0) {
1980 log_error_errno(errno, "Opening '%s' failed: %m", *fn);
1981 if (r == 0)
1982 r = -errno;
1983 continue;
1984 }
1985
1986 k = item_do(i, fd, *fn, action);
1987 if (k < 0 && r == 0)
1988 r = k;
1989
1990 /* we passed fd ownership to the previous call */
1991 fd = -1;
1992 }
1993
1994 return r;
1995 }
1996
1997 static int create_item(Item *i) {
1998 CreationMode creation;
1999 int r = 0;
2000
2001 assert(i);
2002
2003 log_debug("Running create action for entry %c %s", (char) i->type, i->path);
2004
2005 switch (i->type) {
2006
2007 case IGNORE_PATH:
2008 case IGNORE_DIRECTORY_PATH:
2009 case REMOVE_PATH:
2010 case RECURSIVE_REMOVE_PATH:
2011 return 0;
2012
2013 case TRUNCATE_FILE:
2014 case CREATE_FILE:
2015 RUN_WITH_UMASK(0000)
2016 (void) mkdir_parents_label(i->path, 0755);
2017
2018 if ((i->type == CREATE_FILE && i->append_or_force) || i->type == TRUNCATE_FILE)
2019 r = truncate_file(i, i->path);
2020 else
2021 r = create_file(i, i->path);
2022
2023 if (r < 0)
2024 return r;
2025 break;
2026
2027 case COPY_FILES:
2028 RUN_WITH_UMASK(0000)
2029 (void) mkdir_parents_label(i->path, 0755);
2030
2031 r = copy_files(i);
2032 if (r < 0)
2033 return r;
2034 break;
2035
2036 case WRITE_FILE:
2037 r = glob_item(i, write_one_file);
2038 if (r < 0)
2039 return r;
2040
2041 break;
2042
2043 case CREATE_DIRECTORY:
2044 case TRUNCATE_DIRECTORY:
2045 RUN_WITH_UMASK(0000)
2046 (void) mkdir_parents_label(i->path, 0755);
2047
2048 r = create_directory(i, i->path);
2049 if (r < 0)
2050 return r;
2051 break;
2052
2053 case CREATE_SUBVOLUME:
2054 case CREATE_SUBVOLUME_INHERIT_QUOTA:
2055 case CREATE_SUBVOLUME_NEW_QUOTA:
2056 RUN_WITH_UMASK(0000)
2057 (void) mkdir_parents_label(i->path, 0755);
2058
2059 r = create_subvolume(i, i->path);
2060 if (r < 0)
2061 return r;
2062 break;
2063
2064 case EMPTY_DIRECTORY:
2065 r = glob_item(i, empty_directory);
2066 if (r < 0)
2067 return r;
2068 break;
2069
2070 case CREATE_FIFO:
2071 RUN_WITH_UMASK(0000)
2072 (void) mkdir_parents_label(i->path, 0755);
2073
2074 r = create_fifo(i, i->path);
2075 if (r < 0)
2076 return r;
2077 break;
2078
2079 case CREATE_SYMLINK: {
2080 RUN_WITH_UMASK(0000)
2081 (void) mkdir_parents_label(i->path, 0755);
2082
2083 mac_selinux_create_file_prepare(i->path, S_IFLNK);
2084 r = symlink(i->argument, i->path);
2085 mac_selinux_create_file_clear();
2086
2087 if (r < 0) {
2088 _cleanup_free_ char *x = NULL;
2089
2090 if (errno != EEXIST)
2091 return log_error_errno(errno, "symlink(%s, %s) failed: %m", i->argument, i->path);
2092
2093 r = readlink_malloc(i->path, &x);
2094 if (r < 0 || !streq(i->argument, x)) {
2095
2096 if (i->append_or_force) {
2097 mac_selinux_create_file_prepare(i->path, S_IFLNK);
2098 r = symlink_atomic(i->argument, i->path);
2099 mac_selinux_create_file_clear();
2100
2101 if (IN_SET(r, -EISDIR, -EEXIST, -ENOTEMPTY)) {
2102 r = rm_rf(i->path, REMOVE_ROOT|REMOVE_PHYSICAL);
2103 if (r < 0)
2104 return log_error_errno(r, "rm -fr %s failed: %m", i->path);
2105
2106 mac_selinux_create_file_prepare(i->path, S_IFLNK);
2107 r = symlink(i->argument, i->path) < 0 ? -errno : 0;
2108 mac_selinux_create_file_clear();
2109 }
2110 if (r < 0)
2111 return log_error_errno(r, "symlink(%s, %s) failed: %m", i->argument, i->path);
2112
2113 creation = CREATION_FORCE;
2114 } else {
2115 log_debug("\"%s\" is not a symlink or does not point to the correct path.", i->path);
2116 return 0;
2117 }
2118 } else
2119 creation = CREATION_EXISTING;
2120 } else
2121
2122 creation = CREATION_NORMAL;
2123 log_debug("%s symlink \"%s\".", creation_mode_verb_to_string(creation), i->path);
2124 break;
2125 }
2126
2127 case CREATE_BLOCK_DEVICE:
2128 case CREATE_CHAR_DEVICE:
2129 if (have_effective_cap(CAP_MKNOD) == 0) {
2130 /* In a container we lack CAP_MKNOD. We shouldn't attempt to create the device node in that
2131 * case to avoid noise, and we don't support virtualized devices in containers anyway. */
2132
2133 log_debug("We lack CAP_MKNOD, skipping creation of device node %s.", i->path);
2134 return 0;
2135 }
2136
2137 RUN_WITH_UMASK(0000)
2138 (void) mkdir_parents_label(i->path, 0755);
2139
2140 r = create_device(i, i->type == CREATE_BLOCK_DEVICE ? S_IFBLK : S_IFCHR);
2141 if (r < 0)
2142 return r;
2143
2144 break;
2145
2146 case ADJUST_MODE:
2147 case RELABEL_PATH:
2148 r = glob_item(i, path_set_perms);
2149 if (r < 0)
2150 return r;
2151 break;
2152
2153 case RECURSIVE_RELABEL_PATH:
2154 r = glob_item_recursively(i, fd_set_perms);
2155 if (r < 0)
2156 return r;
2157 break;
2158
2159 case SET_XATTR:
2160 r = glob_item(i, path_set_xattrs);
2161 if (r < 0)
2162 return r;
2163 break;
2164
2165 case RECURSIVE_SET_XATTR:
2166 r = glob_item_recursively(i, fd_set_xattrs);
2167 if (r < 0)
2168 return r;
2169 break;
2170
2171 case SET_ACL:
2172 r = glob_item(i, path_set_acls);
2173 if (r < 0)
2174 return r;
2175 break;
2176
2177 case RECURSIVE_SET_ACL:
2178 r = glob_item_recursively(i, fd_set_acls);
2179 if (r < 0)
2180 return r;
2181 break;
2182
2183 case SET_ATTRIBUTE:
2184 r = glob_item(i, path_set_attribute);
2185 if (r < 0)
2186 return r;
2187 break;
2188
2189 case RECURSIVE_SET_ATTRIBUTE:
2190 r = glob_item_recursively(i, fd_set_attribute);
2191 if (r < 0)
2192 return r;
2193 break;
2194 }
2195
2196 return 0;
2197 }
2198
2199 static int remove_item_instance(Item *i, const char *instance) {
2200 int r;
2201
2202 assert(i);
2203
2204 switch (i->type) {
2205
2206 case REMOVE_PATH:
2207 if (remove(instance) < 0 && errno != ENOENT)
2208 return log_error_errno(errno, "rm(%s): %m", instance);
2209
2210 break;
2211
2212 case RECURSIVE_REMOVE_PATH:
2213 /* FIXME: we probably should use dir_cleanup() here instead of rm_rf() so that 'x' is honoured. */
2214 log_debug("rm -rf \"%s\"", instance);
2215 r = rm_rf(instance, REMOVE_ROOT|REMOVE_SUBVOLUME|REMOVE_PHYSICAL);
2216 if (r < 0 && r != -ENOENT)
2217 return log_error_errno(r, "rm_rf(%s): %m", instance);
2218
2219 break;
2220
2221 default:
2222 assert_not_reached("wut?");
2223 }
2224
2225 return 0;
2226 }
2227
2228 static int remove_item(Item *i) {
2229 int r;
2230
2231 assert(i);
2232
2233 log_debug("Running remove action for entry %c %s", (char) i->type, i->path);
2234
2235 switch (i->type) {
2236
2237 case TRUNCATE_DIRECTORY:
2238 /* FIXME: we probably should use dir_cleanup() here instead of rm_rf() so that 'x' is honoured. */
2239 log_debug("rm -rf \"%s\"", i->path);
2240 r = rm_rf(i->path, REMOVE_PHYSICAL);
2241 if (r < 0 && r != -ENOENT)
2242 return log_error_errno(r, "rm_rf(%s): %m", i->path);
2243
2244 return 0;
2245
2246 case REMOVE_PATH:
2247 case RECURSIVE_REMOVE_PATH:
2248 return glob_item(i, remove_item_instance);
2249
2250 default:
2251 return 0;
2252 }
2253 }
2254
2255 static int clean_item_instance(Item *i, const char* instance) {
2256 char timestamp[FORMAT_TIMESTAMP_MAX];
2257 _cleanup_closedir_ DIR *d = NULL;
2258 STRUCT_STATX_DEFINE(sx);
2259 int mountpoint, r;
2260 usec_t cutoff, n;
2261
2262 assert(i);
2263
2264 if (!i->age_set)
2265 return 0;
2266
2267 n = now(CLOCK_REALTIME);
2268 if (n < i->age)
2269 return 0;
2270
2271 cutoff = n - i->age;
2272
2273 d = opendir_nomod(instance);
2274 if (!d) {
2275 if (IN_SET(errno, ENOENT, ENOTDIR)) {
2276 log_debug_errno(errno, "Directory \"%s\": %m", instance);
2277 return 0;
2278 }
2279
2280 return log_error_errno(errno, "Failed to open directory %s: %m", instance);
2281 }
2282
2283 r = statx_fallback(dirfd(d), "", AT_EMPTY_PATH, STATX_MODE|STATX_INO|STATX_ATIME|STATX_MTIME, &sx);
2284 if (r < 0)
2285 return log_error_errno(r, "statx(%s) failed: %m", instance);
2286
2287 if (FLAGS_SET(sx.stx_attributes_mask, STATX_ATTR_MOUNT_ROOT))
2288 mountpoint = FLAGS_SET(sx.stx_attributes, STATX_ATTR_MOUNT_ROOT);
2289 else {
2290 struct stat ps;
2291
2292 if (fstatat(dirfd(d), "..", &ps, AT_SYMLINK_NOFOLLOW) != 0)
2293 return log_error_errno(errno, "stat(%s/..) failed: %m", i->path);
2294
2295 mountpoint =
2296 sx.stx_dev_major != major(ps.st_dev) ||
2297 sx.stx_dev_minor != minor(ps.st_dev) ||
2298 sx.stx_ino != ps.st_ino;
2299 }
2300
2301 log_debug("Cleanup threshold for %s \"%s\" is %s",
2302 mountpoint ? "mount point" : "directory",
2303 instance,
2304 format_timestamp_style(timestamp, sizeof(timestamp), cutoff, TIMESTAMP_US));
2305
2306 return dir_cleanup(i, instance, d,
2307 load_statx_timestamp_nsec(&sx.stx_atime),
2308 load_statx_timestamp_nsec(&sx.stx_mtime),
2309 cutoff * NSEC_PER_USEC,
2310 sx.stx_dev_major, sx.stx_dev_minor, mountpoint,
2311 MAX_DEPTH, i->keep_first_level);
2312 }
2313
2314 static int clean_item(Item *i) {
2315 assert(i);
2316
2317 log_debug("Running clean action for entry %c %s", (char) i->type, i->path);
2318
2319 switch (i->type) {
2320 case CREATE_DIRECTORY:
2321 case CREATE_SUBVOLUME:
2322 case CREATE_SUBVOLUME_INHERIT_QUOTA:
2323 case CREATE_SUBVOLUME_NEW_QUOTA:
2324 case TRUNCATE_DIRECTORY:
2325 case IGNORE_PATH:
2326 case COPY_FILES:
2327 clean_item_instance(i, i->path);
2328 return 0;
2329 case EMPTY_DIRECTORY:
2330 case IGNORE_DIRECTORY_PATH:
2331 return glob_item(i, clean_item_instance);
2332 default:
2333 return 0;
2334 }
2335 }
2336
2337 static int process_item(Item *i, OperationMask operation) {
2338 OperationMask todo;
2339 int r, q, p;
2340
2341 assert(i);
2342
2343 todo = operation & ~i->done;
2344 if (todo == 0) /* Everything already done? */
2345 return 0;
2346
2347 i->done |= operation;
2348
2349 r = chase_symlinks(i->path, arg_root, CHASE_NO_AUTOFS|CHASE_WARN, NULL, NULL);
2350 if (r == -EREMOTE) {
2351 log_notice_errno(r, "Skipping %s", i->path);
2352 return 0;
2353 }
2354 if (r < 0)
2355 log_debug_errno(r, "Failed to determine whether '%s' is below autofs, ignoring: %m", i->path);
2356
2357 r = FLAGS_SET(operation, OPERATION_CREATE) ? create_item(i) : 0;
2358 /* Failure can only be tolerated for create */
2359 if (i->allow_failure)
2360 r = 0;
2361
2362 q = FLAGS_SET(operation, OPERATION_REMOVE) ? remove_item(i) : 0;
2363 p = FLAGS_SET(operation, OPERATION_CLEAN) ? clean_item(i) : 0;
2364
2365 return r < 0 ? r :
2366 q < 0 ? q :
2367 p;
2368 }
2369
2370 static int process_item_array(ItemArray *array, OperationMask operation) {
2371 int r = 0;
2372 size_t n;
2373
2374 assert(array);
2375
2376 /* Create any parent first. */
2377 if (FLAGS_SET(operation, OPERATION_CREATE) && array->parent)
2378 r = process_item_array(array->parent, operation & OPERATION_CREATE);
2379
2380 /* Clean up all children first */
2381 if ((operation & (OPERATION_REMOVE|OPERATION_CLEAN)) && !set_isempty(array->children)) {
2382 ItemArray *c;
2383
2384 SET_FOREACH(c, array->children) {
2385 int k;
2386
2387 k = process_item_array(c, operation & (OPERATION_REMOVE|OPERATION_CLEAN));
2388 if (k < 0 && r == 0)
2389 r = k;
2390 }
2391 }
2392
2393 for (n = 0; n < array->n_items; n++) {
2394 int k;
2395
2396 k = process_item(array->items + n, operation);
2397 if (k < 0 && r == 0)
2398 r = k;
2399 }
2400
2401 return r;
2402 }
2403
2404 static void item_free_contents(Item *i) {
2405 assert(i);
2406 free(i->path);
2407 free(i->argument);
2408 strv_free(i->xattrs);
2409
2410 #if HAVE_ACL
2411 acl_free(i->acl_access);
2412 acl_free(i->acl_default);
2413 #endif
2414 }
2415
2416 static ItemArray* item_array_free(ItemArray *a) {
2417 size_t n;
2418
2419 if (!a)
2420 return NULL;
2421
2422 for (n = 0; n < a->n_items; n++)
2423 item_free_contents(a->items + n);
2424
2425 set_free(a->children);
2426 free(a->items);
2427 return mfree(a);
2428 }
2429
2430 static int item_compare(const Item *a, const Item *b) {
2431 /* Make sure that the ownership taking item is put first, so
2432 * that we first create the node, and then can adjust it */
2433
2434 if (takes_ownership(a->type) && !takes_ownership(b->type))
2435 return -1;
2436 if (!takes_ownership(a->type) && takes_ownership(b->type))
2437 return 1;
2438
2439 return CMP(a->type, b->type);
2440 }
2441
2442 static bool item_compatible(Item *a, Item *b) {
2443 assert(a);
2444 assert(b);
2445 assert(streq(a->path, b->path));
2446
2447 if (takes_ownership(a->type) && takes_ownership(b->type))
2448 /* check if the items are the same */
2449 return streq_ptr(a->argument, b->argument) &&
2450
2451 a->uid_set == b->uid_set &&
2452 a->uid == b->uid &&
2453
2454 a->gid_set == b->gid_set &&
2455 a->gid == b->gid &&
2456
2457 a->mode_set == b->mode_set &&
2458 a->mode == b->mode &&
2459
2460 a->age_set == b->age_set &&
2461 a->age == b->age &&
2462
2463 a->mask_perms == b->mask_perms &&
2464
2465 a->keep_first_level == b->keep_first_level &&
2466
2467 a->major_minor == b->major_minor;
2468
2469 return true;
2470 }
2471
2472 static bool should_include_path(const char *path) {
2473 char **prefix;
2474
2475 STRV_FOREACH(prefix, arg_exclude_prefixes)
2476 if (path_startswith(path, *prefix)) {
2477 log_debug("Entry \"%s\" matches exclude prefix \"%s\", skipping.",
2478 path, *prefix);
2479 return false;
2480 }
2481
2482 STRV_FOREACH(prefix, arg_include_prefixes)
2483 if (path_startswith(path, *prefix)) {
2484 log_debug("Entry \"%s\" matches include prefix \"%s\".", path, *prefix);
2485 return true;
2486 }
2487
2488 /* no matches, so we should include this path only if we have no allow list at all */
2489 if (strv_isempty(arg_include_prefixes))
2490 return true;
2491
2492 log_debug("Entry \"%s\" does not match any include prefix, skipping.", path);
2493 return false;
2494 }
2495
2496 static int specifier_expansion_from_arg(Item *i) {
2497 _cleanup_free_ char *unescaped = NULL, *resolved = NULL;
2498 char **xattr;
2499 int r;
2500
2501 assert(i);
2502
2503 if (!i->argument)
2504 return 0;
2505
2506 switch (i->type) {
2507 case COPY_FILES:
2508 case CREATE_SYMLINK:
2509 case CREATE_FILE:
2510 case TRUNCATE_FILE:
2511 case WRITE_FILE:
2512 r = cunescape(i->argument, 0, &unescaped);
2513 if (r < 0)
2514 return log_error_errno(r, "Failed to unescape parameter to write: %s", i->argument);
2515
2516 r = specifier_printf(unescaped, specifier_table, NULL, &resolved);
2517 if (r < 0)
2518 return r;
2519
2520 free_and_replace(i->argument, resolved);
2521 break;
2522
2523 case SET_XATTR:
2524 case RECURSIVE_SET_XATTR:
2525 STRV_FOREACH(xattr, i->xattrs) {
2526 r = specifier_printf(*xattr, specifier_table, NULL, &resolved);
2527 if (r < 0)
2528 return r;
2529
2530 free_and_replace(*xattr, resolved);
2531 }
2532 break;
2533
2534 default:
2535 break;
2536 }
2537 return 0;
2538 }
2539
2540 static int patch_var_run(const char *fname, unsigned line, char **path) {
2541 const char *k;
2542 char *n;
2543
2544 assert(path);
2545 assert(*path);
2546
2547 /* Optionally rewrites lines referencing /var/run/, to use /run/ instead. Why bother? tmpfiles merges lines in
2548 * some cases and detects conflicts in others. If files/directories are specified through two equivalent lines
2549 * this is problematic as neither case will be detected. Ideally we'd detect these cases by resolving symlinks
2550 * early, but that's precisely not what we can do here as this code very likely is running very early on, at a
2551 * time where the paths in question are not available yet, or even more importantly, our own tmpfiles rules
2552 * might create the paths that are intermediary to the listed paths. We can't really cover the generic case,
2553 * but the least we can do is cover the specific case of /var/run vs. /run, as /var/run is a legacy name for
2554 * /run only, and we explicitly document that and require that on systemd systems the former is a symlink to
2555 * the latter. Moreover files below this path are by far the primary usecase for tmpfiles.d/. */
2556
2557 k = path_startswith(*path, "/var/run/");
2558 if (isempty(k)) /* Don't complain about other paths than /var/run, and not about /var/run itself either. */
2559 return 0;
2560
2561 n = path_join("/run", k);
2562 if (!n)
2563 return log_oom();
2564
2565 /* Also log about this briefly. We do so at LOG_NOTICE level, as we fixed up the situation automatically, hence
2566 * there's no immediate need for action by the user. However, in the interest of making things less confusing
2567 * to the user, let's still inform the user that these snippets should really be updated. */
2568 log_syntax(NULL, LOG_NOTICE, fname, line, 0, "Line references path below legacy directory /var/run/, updating %s → %s; please update the tmpfiles.d/ drop-in file accordingly.", *path, n);
2569
2570 free_and_replace(*path, n);
2571
2572 return 0;
2573 }
2574
2575 static int find_uid(const char *user, uid_t *ret_uid, Hashmap **cache) {
2576 int r;
2577
2578 assert(user);
2579 assert(ret_uid);
2580
2581 /* First: parse as numeric UID string */
2582 r = parse_uid(user, ret_uid);
2583 if (r >= 0)
2584 return r;
2585
2586 /* Second: pass to NSS if we are running "online" */
2587 if (!arg_root)
2588 return get_user_creds(&user, ret_uid, NULL, NULL, NULL, 0);
2589
2590 /* Third, synthesize "root" unconditionally */
2591 if (streq(user, "root")) {
2592 *ret_uid = 0;
2593 return 0;
2594 }
2595
2596 /* Fourth: use fgetpwent() to read /etc/passwd directly, if we are "offline" */
2597 return name_to_uid_offline(arg_root, user, ret_uid, cache);
2598 }
2599
2600 static int find_gid(const char *group, gid_t *ret_gid, Hashmap **cache) {
2601 int r;
2602
2603 assert(group);
2604 assert(ret_gid);
2605
2606 /* First: parse as numeric GID string */
2607 r = parse_gid(group, ret_gid);
2608 if (r >= 0)
2609 return r;
2610
2611 /* Second: pass to NSS if we are running "online" */
2612 if (!arg_root)
2613 return get_group_creds(&group, ret_gid, 0);
2614
2615 /* Third, synthesize "root" unconditionally */
2616 if (streq(group, "root")) {
2617 *ret_gid = 0;
2618 return 0;
2619 }
2620
2621 /* Fourth: use fgetgrent() to read /etc/group directly, if we are "offline" */
2622 return name_to_gid_offline(arg_root, group, ret_gid, cache);
2623 }
2624
2625 static int parse_line(
2626 const char *fname,
2627 unsigned line,
2628 const char *buffer,
2629 bool *invalid_config,
2630 Hashmap **uid_cache,
2631 Hashmap **gid_cache) {
2632
2633 _cleanup_free_ char *action = NULL, *mode = NULL, *user = NULL, *group = NULL, *age = NULL, *path = NULL;
2634 _cleanup_(item_free_contents) Item i = {};
2635 ItemArray *existing;
2636 OrderedHashmap *h;
2637 int r, pos;
2638 bool append_or_force = false, boot = false, allow_failure = false;
2639
2640 assert(fname);
2641 assert(line >= 1);
2642 assert(buffer);
2643
2644 r = extract_many_words(
2645 &buffer,
2646 NULL,
2647 EXTRACT_UNQUOTE,
2648 &action,
2649 &path,
2650 &mode,
2651 &user,
2652 &group,
2653 &age,
2654 NULL);
2655 if (r < 0) {
2656 if (IN_SET(r, -EINVAL, -EBADSLT))
2657 /* invalid quoting and such or an unknown specifier */
2658 *invalid_config = true;
2659 return log_syntax(NULL, LOG_ERR, fname, line, r, "Failed to parse line: %m");
2660 } else if (r < 2) {
2661 *invalid_config = true;
2662 return log_syntax(NULL, LOG_ERR, fname, line, SYNTHETIC_ERRNO(EBADMSG), "Syntax error.");
2663 }
2664
2665 if (!empty_or_dash(buffer)) {
2666 i.argument = strdup(buffer);
2667 if (!i.argument)
2668 return log_oom();
2669 }
2670
2671 if (isempty(action)) {
2672 *invalid_config = true;
2673 return log_syntax(NULL, LOG_ERR, fname, line, SYNTHETIC_ERRNO(EBADMSG), "Command too short '%s'.", action);
2674 }
2675
2676 for (pos = 1; action[pos]; pos++) {
2677 if (action[pos] == '!' && !boot)
2678 boot = true;
2679 else if (action[pos] == '+' && !append_or_force)
2680 append_or_force = true;
2681 else if (action[pos] == '-' && !allow_failure)
2682 allow_failure = true;
2683 else {
2684 *invalid_config = true;
2685 return log_syntax(NULL, LOG_ERR, fname, line, SYNTHETIC_ERRNO(EBADMSG), "Unknown modifiers in command '%s'", action);
2686 }
2687 }
2688
2689 if (boot && !arg_boot) {
2690 log_syntax(NULL, LOG_DEBUG, fname, line, 0, "Ignoring entry %s \"%s\" because --boot is not specified.", action, path);
2691 return 0;
2692 }
2693
2694 i.type = action[0];
2695 i.append_or_force = append_or_force;
2696 i.allow_failure = allow_failure;
2697
2698 r = specifier_printf(path, specifier_table, NULL, &i.path);
2699 if (r == -ENXIO)
2700 return log_unresolvable_specifier(fname, line);
2701 if (r < 0) {
2702 if (IN_SET(r, -EINVAL, -EBADSLT))
2703 *invalid_config = true;
2704 return log_syntax(NULL, LOG_ERR, fname, line, r, "Failed to replace specifiers in '%s': %m", path);
2705 }
2706
2707 r = patch_var_run(fname, line, &i.path);
2708 if (r < 0)
2709 return r;
2710
2711 switch (i.type) {
2712
2713 case CREATE_DIRECTORY:
2714 case CREATE_SUBVOLUME:
2715 case CREATE_SUBVOLUME_INHERIT_QUOTA:
2716 case CREATE_SUBVOLUME_NEW_QUOTA:
2717 case EMPTY_DIRECTORY:
2718 case TRUNCATE_DIRECTORY:
2719 case CREATE_FIFO:
2720 case IGNORE_PATH:
2721 case IGNORE_DIRECTORY_PATH:
2722 case REMOVE_PATH:
2723 case RECURSIVE_REMOVE_PATH:
2724 case ADJUST_MODE:
2725 case RELABEL_PATH:
2726 case RECURSIVE_RELABEL_PATH:
2727 if (i.argument)
2728 log_syntax(NULL, LOG_WARNING, fname, line, 0, "%c lines don't take argument fields, ignoring.", i.type);
2729
2730 break;
2731
2732 case CREATE_FILE:
2733 case TRUNCATE_FILE:
2734 break;
2735
2736 case CREATE_SYMLINK:
2737 if (!i.argument) {
2738 i.argument = path_join("/usr/share/factory", i.path);
2739 if (!i.argument)
2740 return log_oom();
2741 }
2742 break;
2743
2744 case WRITE_FILE:
2745 if (!i.argument) {
2746 *invalid_config = true;
2747 return log_syntax(NULL, LOG_ERR, fname, line, SYNTHETIC_ERRNO(EBADMSG), "Write file requires argument.");
2748 }
2749 break;
2750
2751 case COPY_FILES:
2752 if (!i.argument) {
2753 i.argument = path_join("/usr/share/factory", i.path);
2754 if (!i.argument)
2755 return log_oom();
2756
2757 } else if (!path_is_absolute(i.argument)) {
2758 *invalid_config = true;
2759 return log_syntax(NULL, LOG_ERR, fname, line, SYNTHETIC_ERRNO(EBADMSG), "Source path '%s' is not absolute.", i.argument);
2760
2761 }
2762
2763 if (!empty_or_root(arg_root)) {
2764 char *p;
2765
2766 p = path_join(arg_root, i.argument);
2767 if (!p)
2768 return log_oom();
2769 free_and_replace(i.argument, p);
2770 }
2771
2772 path_simplify(i.argument, false);
2773 break;
2774
2775 case CREATE_CHAR_DEVICE:
2776 case CREATE_BLOCK_DEVICE:
2777 if (!i.argument) {
2778 *invalid_config = true;
2779 return log_syntax(NULL, LOG_ERR, fname, line, SYNTHETIC_ERRNO(EBADMSG), "Device file requires argument.");
2780 }
2781
2782 r = parse_dev(i.argument, &i.major_minor);
2783 if (r < 0) {
2784 *invalid_config = true;
2785 return log_syntax(NULL, LOG_ERR, fname, line, r, "Can't parse device file major/minor '%s'.", i.argument);
2786 }
2787
2788 break;
2789
2790 case SET_XATTR:
2791 case RECURSIVE_SET_XATTR:
2792 if (!i.argument) {
2793 *invalid_config = true;
2794 return log_syntax(NULL, LOG_ERR, fname, line, SYNTHETIC_ERRNO(EBADMSG),
2795 "Set extended attribute requires argument.");
2796 }
2797 r = parse_xattrs_from_arg(&i);
2798 if (r < 0)
2799 return r;
2800 break;
2801
2802 case SET_ACL:
2803 case RECURSIVE_SET_ACL:
2804 if (!i.argument) {
2805 *invalid_config = true;
2806 return log_syntax(NULL, LOG_ERR, fname, line, SYNTHETIC_ERRNO(EBADMSG),
2807 "Set ACLs requires argument.");
2808 }
2809 r = parse_acls_from_arg(&i);
2810 if (r < 0)
2811 return r;
2812 break;
2813
2814 case SET_ATTRIBUTE:
2815 case RECURSIVE_SET_ATTRIBUTE:
2816 if (!i.argument) {
2817 *invalid_config = true;
2818 return log_syntax(NULL, LOG_ERR, fname, line, SYNTHETIC_ERRNO(EBADMSG),
2819 "Set file attribute requires argument.");
2820 }
2821 r = parse_attribute_from_arg(&i);
2822 if (IN_SET(r, -EINVAL, -EBADSLT))
2823 *invalid_config = true;
2824 if (r < 0)
2825 return r;
2826 break;
2827
2828 default:
2829 *invalid_config = true;
2830 return log_syntax(NULL, LOG_ERR, fname, line, SYNTHETIC_ERRNO(EBADMSG),
2831 "Unknown command type '%c'.", (char) i.type);
2832 }
2833
2834 if (!path_is_absolute(i.path)) {
2835 *invalid_config = true;
2836 return log_syntax(NULL, LOG_ERR, fname, line, SYNTHETIC_ERRNO(EBADMSG),
2837 "Path '%s' not absolute.", i.path);
2838 }
2839
2840 path_simplify(i.path, false);
2841
2842 if (!should_include_path(i.path))
2843 return 0;
2844
2845 r = specifier_expansion_from_arg(&i);
2846 if (r == -ENXIO)
2847 return log_unresolvable_specifier(fname, line);
2848 if (r < 0) {
2849 if (IN_SET(r, -EINVAL, -EBADSLT))
2850 *invalid_config = true;
2851 return log_syntax(NULL, LOG_ERR, fname, line, r, "Failed to substitute specifiers in argument: %m");
2852 }
2853
2854 if (!empty_or_root(arg_root)) {
2855 char *p;
2856
2857 p = path_join(arg_root, i.path);
2858 if (!p)
2859 return log_oom();
2860 free_and_replace(i.path, p);
2861 }
2862
2863 if (!empty_or_dash(user)) {
2864 r = find_uid(user, &i.uid, uid_cache);
2865 if (r < 0) {
2866 *invalid_config = true;
2867 return log_syntax(NULL, LOG_ERR, fname, line, r, "Failed to resolve user '%s': %m", user);
2868 }
2869
2870 i.uid_set = true;
2871 }
2872
2873 if (!empty_or_dash(group)) {
2874 r = find_gid(group, &i.gid, gid_cache);
2875 if (r < 0) {
2876 *invalid_config = true;
2877 return log_syntax(NULL, LOG_ERR, fname, line, r, "Failed to resolve group '%s'.", group);
2878 }
2879
2880 i.gid_set = true;
2881 }
2882
2883 if (!empty_or_dash(mode)) {
2884 const char *mm = mode;
2885 unsigned m;
2886
2887 if (*mm == '~') {
2888 i.mask_perms = true;
2889 mm++;
2890 }
2891
2892 r = parse_mode(mm, &m);
2893 if (r < 0) {
2894 *invalid_config = true;
2895 return log_syntax(NULL, LOG_ERR, fname, line, r, "Invalid mode '%s'.", mode);
2896 }
2897
2898 i.mode = m;
2899 i.mode_set = true;
2900 } else
2901 i.mode = IN_SET(i.type, CREATE_DIRECTORY, TRUNCATE_DIRECTORY, CREATE_SUBVOLUME, CREATE_SUBVOLUME_INHERIT_QUOTA, CREATE_SUBVOLUME_NEW_QUOTA) ? 0755 : 0644;
2902
2903 if (!empty_or_dash(age)) {
2904 const char *a = age;
2905
2906 if (*a == '~') {
2907 i.keep_first_level = true;
2908 a++;
2909 }
2910
2911 r = parse_sec(a, &i.age);
2912 if (r < 0) {
2913 *invalid_config = true;
2914 return log_syntax(NULL, LOG_ERR, fname, line, r, "Invalid age '%s'.", age);
2915 }
2916
2917 i.age_set = true;
2918 }
2919
2920 h = needs_glob(i.type) ? globs : items;
2921
2922 existing = ordered_hashmap_get(h, i.path);
2923 if (existing) {
2924 size_t n;
2925
2926 for (n = 0; n < existing->n_items; n++) {
2927 if (!item_compatible(existing->items + n, &i) && !i.append_or_force) {
2928 log_syntax(NULL, LOG_NOTICE, fname, line, 0, "Duplicate line for path \"%s\", ignoring.", i.path);
2929 return 0;
2930 }
2931 }
2932 } else {
2933 existing = new0(ItemArray, 1);
2934 if (!existing)
2935 return log_oom();
2936
2937 r = ordered_hashmap_put(h, i.path, existing);
2938 if (r < 0) {
2939 free(existing);
2940 return log_oom();
2941 }
2942 }
2943
2944 if (!GREEDY_REALLOC(existing->items, existing->allocated, existing->n_items + 1))
2945 return log_oom();
2946
2947 existing->items[existing->n_items++] = i;
2948 i = (struct Item) {};
2949
2950 /* Sort item array, to enforce stable ordering of application */
2951 typesafe_qsort(existing->items, existing->n_items, item_compare);
2952
2953 return 0;
2954 }
2955
2956 static int cat_config(char **config_dirs, char **args) {
2957 _cleanup_strv_free_ char **files = NULL;
2958 int r;
2959
2960 r = conf_files_list_with_replacement(arg_root, config_dirs, arg_replace, &files, NULL);
2961 if (r < 0)
2962 return r;
2963
2964 return cat_files(NULL, files, 0);
2965 }
2966
2967 static int exclude_default_prefixes(void) {
2968 int r;
2969
2970 /* Provide an easy way to exclude virtual/memory file systems from what we do here. Useful in
2971 * combination with --root= where we probably don't want to apply stuff to these dirs as they are
2972 * likely over-mounted if the root directory is actually used, and it wouldbe less than ideal to have
2973 * all kinds of files created/adjusted underneath these mount points. */
2974
2975 r = strv_extend_strv(
2976 &arg_exclude_prefixes,
2977 STRV_MAKE("/dev",
2978 "/proc",
2979 "/run",
2980 "/sys"),
2981 true);
2982 if (r < 0)
2983 return log_oom();
2984
2985 return 0;
2986 }
2987
2988 static int help(void) {
2989 _cleanup_free_ char *link = NULL;
2990 int r;
2991
2992 r = terminal_urlify_man("systemd-tmpfiles", "8", &link);
2993 if (r < 0)
2994 return log_oom();
2995
2996 printf("%s [OPTIONS...] [CONFIGURATION FILE...]\n\n"
2997 "Creates, deletes and cleans up volatile and temporary files and directories.\n\n"
2998 " -h --help Show this help\n"
2999 " --user Execute user configuration\n"
3000 " --version Show package version\n"
3001 " --cat-config Show configuration files\n"
3002 " --create Create marked files/directories\n"
3003 " --clean Clean up marked directories\n"
3004 " --remove Remove marked files/directories\n"
3005 " --boot Execute actions only safe at boot\n"
3006 " --prefix=PATH Only apply rules with the specified prefix\n"
3007 " --exclude-prefix=PATH Ignore rules with the specified prefix\n"
3008 " -E Ignore rules prefixed with /dev, /proc, /run, /sys\n"
3009 " --root=PATH Operate on an alternate filesystem root\n"
3010 " --image=PATH Operate on disk image as filesystem root\n"
3011 " --replace=PATH Treat arguments as replacement for PATH\n"
3012 " --no-pager Do not pipe output into a pager\n"
3013 "\nSee the %s for details.\n"
3014 , program_invocation_short_name
3015 , link
3016 );
3017
3018 return 0;
3019 }
3020
3021 static int parse_argv(int argc, char *argv[]) {
3022
3023 enum {
3024 ARG_VERSION = 0x100,
3025 ARG_CAT_CONFIG,
3026 ARG_USER,
3027 ARG_CREATE,
3028 ARG_CLEAN,
3029 ARG_REMOVE,
3030 ARG_BOOT,
3031 ARG_PREFIX,
3032 ARG_EXCLUDE_PREFIX,
3033 ARG_ROOT,
3034 ARG_IMAGE,
3035 ARG_REPLACE,
3036 ARG_NO_PAGER,
3037 };
3038
3039 static const struct option options[] = {
3040 { "help", no_argument, NULL, 'h' },
3041 { "user", no_argument, NULL, ARG_USER },
3042 { "version", no_argument, NULL, ARG_VERSION },
3043 { "cat-config", no_argument, NULL, ARG_CAT_CONFIG },
3044 { "create", no_argument, NULL, ARG_CREATE },
3045 { "clean", no_argument, NULL, ARG_CLEAN },
3046 { "remove", no_argument, NULL, ARG_REMOVE },
3047 { "boot", no_argument, NULL, ARG_BOOT },
3048 { "prefix", required_argument, NULL, ARG_PREFIX },
3049 { "exclude-prefix", required_argument, NULL, ARG_EXCLUDE_PREFIX },
3050 { "root", required_argument, NULL, ARG_ROOT },
3051 { "image", required_argument, NULL, ARG_IMAGE },
3052 { "replace", required_argument, NULL, ARG_REPLACE },
3053 { "no-pager", no_argument, NULL, ARG_NO_PAGER },
3054 {}
3055 };
3056
3057 int c, r;
3058
3059 assert(argc >= 0);
3060 assert(argv);
3061
3062 while ((c = getopt_long(argc, argv, "hE", options, NULL)) >= 0)
3063
3064 switch (c) {
3065
3066 case 'h':
3067 return help();
3068
3069 case ARG_VERSION:
3070 return version();
3071
3072 case ARG_CAT_CONFIG:
3073 arg_cat_config = true;
3074 break;
3075
3076 case ARG_USER:
3077 arg_user = true;
3078 break;
3079
3080 case ARG_CREATE:
3081 arg_operation |= OPERATION_CREATE;
3082 break;
3083
3084 case ARG_CLEAN:
3085 arg_operation |= OPERATION_CLEAN;
3086 break;
3087
3088 case ARG_REMOVE:
3089 arg_operation |= OPERATION_REMOVE;
3090 break;
3091
3092 case ARG_BOOT:
3093 arg_boot = true;
3094 break;
3095
3096 case ARG_PREFIX:
3097 if (strv_push(&arg_include_prefixes, optarg) < 0)
3098 return log_oom();
3099 break;
3100
3101 case ARG_EXCLUDE_PREFIX:
3102 if (strv_push(&arg_exclude_prefixes, optarg) < 0)
3103 return log_oom();
3104 break;
3105
3106 case ARG_ROOT:
3107 r = parse_path_argument_and_warn(optarg, /* suppress_root= */ false, &arg_root);
3108 if (r < 0)
3109 return r;
3110 break;
3111
3112 case ARG_IMAGE:
3113 #ifdef STANDALONE
3114 return log_error_errno(SYNTHETIC_ERRNO(EOPNOTSUPP),
3115 "This systemd-tmpfiles version is compiled without support for --image=.");
3116 #else
3117 r = parse_path_argument_and_warn(optarg, /* suppress_root= */ false, &arg_image);
3118 if (r < 0)
3119 return r;
3120 #endif
3121 /* Imply -E here since it makes little sense to create files persistently in the /run mountpoint of a disk image */
3122 _fallthrough_;
3123
3124 case 'E':
3125 r = exclude_default_prefixes();
3126 if (r < 0)
3127 return r;
3128
3129 break;
3130
3131 case ARG_REPLACE:
3132 if (!path_is_absolute(optarg) ||
3133 !endswith(optarg, ".conf"))
3134 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
3135 "The argument to --replace= must an absolute path to a config file");
3136
3137 arg_replace = optarg;
3138 break;
3139
3140 case ARG_NO_PAGER:
3141 arg_pager_flags |= PAGER_DISABLE;
3142 break;
3143
3144 case '?':
3145 return -EINVAL;
3146
3147 default:
3148 assert_not_reached("Unhandled option");
3149 }
3150
3151 if (arg_operation == 0 && !arg_cat_config)
3152 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
3153 "You need to specify at least one of --clean, --create or --remove.");
3154
3155 if (arg_replace && arg_cat_config)
3156 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
3157 "Option --replace= is not supported with --cat-config");
3158
3159 if (arg_replace && optind >= argc)
3160 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
3161 "When --replace= is given, some configuration items must be specified");
3162
3163 if (arg_root && arg_user)
3164 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
3165 "Combination of --user and --root= is not supported.");
3166
3167 if (arg_image && arg_root)
3168 return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "Please specify either --root= or --image=, the combination of both is not supported.");
3169
3170 return 1;
3171 }
3172
3173 static int read_config_file(char **config_dirs, const char *fn, bool ignore_enoent, bool *invalid_config) {
3174 _cleanup_(hashmap_freep) Hashmap *uid_cache = NULL, *gid_cache = NULL;
3175 _cleanup_fclose_ FILE *_f = NULL;
3176 unsigned v = 0;
3177 FILE *f;
3178 Item *i;
3179 int r = 0;
3180
3181 assert(fn);
3182
3183 if (streq(fn, "-")) {
3184 log_debug("Reading config from stdin…");
3185 fn = "<stdin>";
3186 f = stdin;
3187 } else {
3188 r = search_and_fopen(fn, "re", arg_root, (const char**) config_dirs, &_f);
3189 if (r < 0) {
3190 if (ignore_enoent && r == -ENOENT) {
3191 log_debug_errno(r, "Failed to open \"%s\", ignoring: %m", fn);
3192 return 0;
3193 }
3194
3195 return log_error_errno(r, "Failed to open '%s': %m", fn);
3196 }
3197 log_debug("Reading config file \"%s\"…", fn);
3198 f = _f;
3199 }
3200
3201 for (;;) {
3202 _cleanup_free_ char *line = NULL;
3203 bool invalid_line = false;
3204 char *l;
3205 int k;
3206
3207 k = read_line(f, LONG_LINE_MAX, &line);
3208 if (k < 0)
3209 return log_error_errno(k, "Failed to read '%s': %m", fn);
3210 if (k == 0)
3211 break;
3212
3213 v++;
3214
3215 l = strstrip(line);
3216 if (IN_SET(*l, 0, '#'))
3217 continue;
3218
3219 k = parse_line(fn, v, l, &invalid_line, &uid_cache, &gid_cache);
3220 if (k < 0) {
3221 if (invalid_line)
3222 /* Allow reporting with a special code if the caller requested this */
3223 *invalid_config = true;
3224 else if (r == 0)
3225 /* The first error becomes our return value */
3226 r = k;
3227 }
3228 }
3229
3230 /* we have to determine age parameter for each entry of type X */
3231 ORDERED_HASHMAP_FOREACH(i, globs) {
3232 Item *j, *candidate_item = NULL;
3233
3234 if (i->type != IGNORE_DIRECTORY_PATH)
3235 continue;
3236
3237 ORDERED_HASHMAP_FOREACH(j, items) {
3238 if (!IN_SET(j->type, CREATE_DIRECTORY, TRUNCATE_DIRECTORY, CREATE_SUBVOLUME, CREATE_SUBVOLUME_INHERIT_QUOTA, CREATE_SUBVOLUME_NEW_QUOTA))
3239 continue;
3240
3241 if (path_equal(j->path, i->path)) {
3242 candidate_item = j;
3243 break;
3244 }
3245
3246 if ((!candidate_item && path_startswith(i->path, j->path)) ||
3247 (candidate_item && path_startswith(j->path, candidate_item->path) && (fnmatch(i->path, j->path, FNM_PATHNAME | FNM_PERIOD) == 0)))
3248 candidate_item = j;
3249 }
3250
3251 if (candidate_item && candidate_item->age_set) {
3252 i->age = candidate_item->age;
3253 i->age_set = true;
3254 }
3255 }
3256
3257 if (ferror(f)) {
3258 log_error_errno(errno, "Failed to read from file %s: %m", fn);
3259 if (r == 0)
3260 r = -EIO;
3261 }
3262
3263 return r;
3264 }
3265
3266 static int parse_arguments(char **config_dirs, char **args, bool *invalid_config) {
3267 char **arg;
3268 int r;
3269
3270 STRV_FOREACH(arg, args) {
3271 r = read_config_file(config_dirs, *arg, false, invalid_config);
3272 if (r < 0)
3273 return r;
3274 }
3275
3276 return 0;
3277 }
3278
3279 static int read_config_files(char **config_dirs, char **args, bool *invalid_config) {
3280 _cleanup_strv_free_ char **files = NULL;
3281 _cleanup_free_ char *p = NULL;
3282 char **f;
3283 int r;
3284
3285 r = conf_files_list_with_replacement(arg_root, config_dirs, arg_replace, &files, &p);
3286 if (r < 0)
3287 return r;
3288
3289 STRV_FOREACH(f, files)
3290 if (p && path_equal(*f, p)) {
3291 log_debug("Parsing arguments at position \"%s\"…", *f);
3292
3293 r = parse_arguments(config_dirs, args, invalid_config);
3294 if (r < 0)
3295 return r;
3296 } else
3297 /* Just warn, ignore result otherwise.
3298 * read_config_file() has some debug output, so no need to print anything. */
3299 (void) read_config_file(config_dirs, *f, true, invalid_config);
3300
3301 return 0;
3302 }
3303
3304 static int link_parent(ItemArray *a) {
3305 const char *path;
3306 char *prefix;
3307 int r;
3308
3309 assert(a);
3310
3311 /* Finds the closest "parent" item array for the specified item array. Then registers the specified item array
3312 * as child of it, and fills the parent in, linking them both ways. This allows us to later create parents
3313 * before their children, and clean up/remove children before their parents. */
3314
3315 if (a->n_items <= 0)
3316 return 0;
3317
3318 path = a->items[0].path;
3319 prefix = newa(char, strlen(path) + 1);
3320 PATH_FOREACH_PREFIX(prefix, path) {
3321 ItemArray *j;
3322
3323 j = ordered_hashmap_get(items, prefix);
3324 if (!j)
3325 j = ordered_hashmap_get(globs, prefix);
3326 if (j) {
3327 r = set_ensure_put(&j->children, NULL, a);
3328 if (r < 0)
3329 return log_oom();
3330
3331 a->parent = j;
3332 return 1;
3333 }
3334 }
3335
3336 return 0;
3337 }
3338
3339 DEFINE_PRIVATE_HASH_OPS_WITH_VALUE_DESTRUCTOR(item_array_hash_ops, char, string_hash_func, string_compare_func,
3340 ItemArray, item_array_free);
3341
3342 static int run(int argc, char *argv[]) {
3343 #ifndef STANDALONE
3344 _cleanup_(loop_device_unrefp) LoopDevice *loop_device = NULL;
3345 _cleanup_(decrypted_image_unrefp) DecryptedImage *decrypted_image = NULL;
3346 _cleanup_(umount_and_rmdir_and_freep) char *unlink_dir = NULL;
3347 #endif
3348 _cleanup_strv_free_ char **config_dirs = NULL;
3349 bool invalid_config = false;
3350 ItemArray *a;
3351 enum {
3352 PHASE_REMOVE_AND_CLEAN,
3353 PHASE_CREATE,
3354 _PHASE_MAX
3355 } phase;
3356 int r, k;
3357
3358 r = parse_argv(argc, argv);
3359 if (r <= 0)
3360 return r;
3361
3362 log_setup_service();
3363
3364 /* Descending down file system trees might take a lot of fds */
3365 (void) rlimit_nofile_bump(HIGH_RLIMIT_NOFILE);
3366
3367 if (arg_user) {
3368 r = user_config_paths(&config_dirs);
3369 if (r < 0)
3370 return log_error_errno(r, "Failed to initialize configuration directory list: %m");
3371 } else {
3372 config_dirs = strv_split_nulstr(CONF_PATHS_NULSTR("tmpfiles.d"));
3373 if (!config_dirs)
3374 return log_oom();
3375 }
3376
3377 if (DEBUG_LOGGING) {
3378 _cleanup_free_ char *t = NULL;
3379 char **i;
3380
3381 STRV_FOREACH(i, config_dirs) {
3382 _cleanup_free_ char *j = NULL;
3383
3384 j = path_join(arg_root, *i);
3385 if (!j)
3386 return log_oom();
3387
3388 if (!strextend(&t, "\n\t", j, NULL))
3389 return log_oom();
3390 }
3391
3392 log_debug("Looking for configuration files in (higher priority first):%s", t);
3393 }
3394
3395 if (arg_cat_config) {
3396 (void) pager_open(arg_pager_flags);
3397
3398 return cat_config(config_dirs, argv + optind);
3399 }
3400
3401 umask(0022);
3402
3403 r = mac_selinux_init();
3404 if (r < 0)
3405 return r;
3406
3407 #ifndef STANDALONE
3408 if (arg_image) {
3409 assert(!arg_root);
3410
3411 r = mount_image_privately_interactively(
3412 arg_image,
3413 DISSECT_IMAGE_REQUIRE_ROOT|DISSECT_IMAGE_VALIDATE_OS|DISSECT_IMAGE_RELAX_VAR_CHECK|DISSECT_IMAGE_FSCK,
3414 &unlink_dir,
3415 &loop_device,
3416 &decrypted_image);
3417 if (r < 0)
3418 return r;
3419
3420 arg_root = strdup(unlink_dir);
3421 if (!arg_root)
3422 return log_oom();
3423 }
3424 #else
3425 assert(!arg_image);
3426 #endif
3427
3428 items = ordered_hashmap_new(&item_array_hash_ops);
3429 globs = ordered_hashmap_new(&item_array_hash_ops);
3430 if (!items || !globs)
3431 return log_oom();
3432
3433 /* If command line arguments are specified along with --replace, read all
3434 * configuration files and insert the positional arguments at the specified
3435 * place. Otherwise, if command line arguments are specified, execute just
3436 * them, and finally, without --replace= or any positional arguments, just
3437 * read configuration and execute it.
3438 */
3439 if (arg_replace || optind >= argc)
3440 r = read_config_files(config_dirs, argv + optind, &invalid_config);
3441 else
3442 r = parse_arguments(config_dirs, argv + optind, &invalid_config);
3443 if (r < 0)
3444 return r;
3445
3446 /* Let's now link up all child/parent relationships */
3447 ORDERED_HASHMAP_FOREACH(a, items) {
3448 r = link_parent(a);
3449 if (r < 0)
3450 return r;
3451 }
3452 ORDERED_HASHMAP_FOREACH(a, globs) {
3453 r = link_parent(a);
3454 if (r < 0)
3455 return r;
3456 }
3457
3458 /* If multiple operations are requested, let's first run the remove/clean operations, and only then the create
3459 * operations. i.e. that we first clean out the platform we then build on. */
3460 for (phase = 0; phase < _PHASE_MAX; phase++) {
3461 OperationMask op;
3462
3463 if (phase == PHASE_REMOVE_AND_CLEAN)
3464 op = arg_operation & (OPERATION_REMOVE|OPERATION_CLEAN);
3465 else if (phase == PHASE_CREATE)
3466 op = arg_operation & OPERATION_CREATE;
3467 else
3468 assert_not_reached("unexpected phase");
3469
3470 if (op == 0) /* Nothing requested in this phase */
3471 continue;
3472
3473 /* The non-globbing ones usually create things, hence we apply them first */
3474 ORDERED_HASHMAP_FOREACH(a, items) {
3475 k = process_item_array(a, op);
3476 if (k < 0 && r >= 0)
3477 r = k;
3478 }
3479
3480 /* The globbing ones usually alter things, hence we apply them second. */
3481 ORDERED_HASHMAP_FOREACH(a, globs) {
3482 k = process_item_array(a, op);
3483 if (k < 0 && r >= 0)
3484 r = k;
3485 }
3486 }
3487
3488 if (ERRNO_IS_RESOURCE(r))
3489 return r;
3490 if (invalid_config)
3491 return EX_DATAERR;
3492 if (r < 0)
3493 return EX_CANTCREAT;
3494 return 0;
3495 }
3496
3497 DEFINE_MAIN_FUNCTION_WITH_POSITIVE_FAILURE(run);
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