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string-util: imply NULL termination of strextend() argument list
[thirdparty/systemd.git] / src / tmpfiles / tmpfiles.c
1 /* SPDX-License-Identifier: LGPL-2.1-or-later */
2
3 #include <errno.h>
4 #include <fcntl.h>
5 #include <fnmatch.h>
6 #include <getopt.h>
7 #include <limits.h>
8 #include <linux/fs.h>
9 #include <stdbool.h>
10 #include <stddef.h>
11 #include <stdlib.h>
12 #include <sys/file.h>
13 #include <sys/xattr.h>
14 #include <sysexits.h>
15 #include <time.h>
16 #include <unistd.h>
17
18 #include "sd-path.h"
19
20 #include "acl-util.h"
21 #include "alloc-util.h"
22 #include "btrfs-util.h"
23 #include "capability-util.h"
24 #include "chattr-util.h"
25 #include "conf-files.h"
26 #include "copy.h"
27 #include "def.h"
28 #include "dirent-util.h"
29 #include "dissect-image.h"
30 #include "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 { 'a', specifier_architecture, NULL },
192 { 'b', specifier_boot_id, NULL },
193 { 'B', specifier_os_build_id, NULL },
194 { 'H', specifier_host_name, NULL },
195 { 'l', specifier_short_host_name, NULL },
196 { 'm', specifier_machine_id_safe, NULL },
197 { 'o', specifier_os_id, NULL },
198 { 'v', specifier_kernel_release, NULL },
199 { 'w', specifier_os_version_id, NULL },
200 { 'W', specifier_os_variant_id, NULL },
201
202 { 'h', specifier_user_home, NULL },
203
204 { 'C', specifier_directory, UINT_TO_PTR(DIRECTORY_CACHE) },
205 { 'L', specifier_directory, UINT_TO_PTR(DIRECTORY_LOGS) },
206 { 'S', specifier_directory, UINT_TO_PTR(DIRECTORY_STATE) },
207 { 't', specifier_directory, UINT_TO_PTR(DIRECTORY_RUNTIME) },
208
209 COMMON_CREDS_SPECIFIERS,
210
211 COMMON_TMP_SPECIFIERS,
212 {}
213 };
214
215 static int specifier_machine_id_safe(char specifier, const void *data, const void *userdata, char **ret) {
216 int r;
217
218 /* If /etc/machine_id is missing or empty (e.g. in a chroot environment)
219 * return a recognizable error so that the caller can skip the rule
220 * gracefully. */
221
222 r = specifier_machine_id(specifier, data, userdata, ret);
223 if (IN_SET(r, -ENOENT, -ENOMEDIUM))
224 return -ENXIO;
225
226 return r;
227 }
228
229 static int specifier_directory(char specifier, const void *data, const void *userdata, char **ret) {
230 struct table_entry {
231 uint64_t type;
232 const char *suffix;
233 };
234
235 static const struct table_entry paths_system[] = {
236 [DIRECTORY_RUNTIME] = { SD_PATH_SYSTEM_RUNTIME },
237 [DIRECTORY_STATE] = { SD_PATH_SYSTEM_STATE_PRIVATE },
238 [DIRECTORY_CACHE] = { SD_PATH_SYSTEM_STATE_CACHE },
239 [DIRECTORY_LOGS] = { SD_PATH_SYSTEM_STATE_LOGS },
240 };
241
242 static const struct table_entry paths_user[] = {
243 [DIRECTORY_RUNTIME] = { SD_PATH_USER_RUNTIME },
244 [DIRECTORY_STATE] = { SD_PATH_USER_CONFIGURATION },
245 [DIRECTORY_CACHE] = { SD_PATH_USER_STATE_CACHE },
246 [DIRECTORY_LOGS] = { SD_PATH_USER_CONFIGURATION, "log" },
247 };
248
249 unsigned i;
250 const struct table_entry *paths;
251
252 assert_cc(ELEMENTSOF(paths_system) == ELEMENTSOF(paths_user));
253 paths = arg_user ? paths_user : paths_system;
254
255 i = PTR_TO_UINT(data);
256 assert(i < ELEMENTSOF(paths_system));
257
258 return sd_path_lookup(paths[i].type, paths[i].suffix, ret);
259 }
260
261 static int log_unresolvable_specifier(const char *filename, unsigned line) {
262 static bool notified = false;
263
264 /* In system mode, this is called when /etc is not fully initialized (e.g.
265 * in a chroot environment) where some specifiers are unresolvable. In user
266 * mode, this is called when some variables are not defined. These cases are
267 * not considered as an error so log at LOG_NOTICE only for the first time
268 * and then downgrade this to LOG_DEBUG for the rest. */
269
270 log_syntax(NULL,
271 notified ? LOG_DEBUG : LOG_NOTICE,
272 filename, line, 0,
273 "Failed to resolve specifier: %s, skipping",
274 arg_user ? "Required $XDG_... variable not defined" : "uninitialized /etc detected");
275
276 if (!notified)
277 log_notice("All rules containing unresolvable specifiers will be skipped.");
278
279 notified = true;
280 return 0;
281 }
282
283 static int user_config_paths(char*** ret) {
284 _cleanup_strv_free_ char **config_dirs = NULL, **data_dirs = NULL;
285 _cleanup_free_ char *persistent_config = NULL, *runtime_config = NULL, *data_home = NULL;
286 _cleanup_strv_free_ char **res = NULL;
287 int r;
288
289 r = xdg_user_dirs(&config_dirs, &data_dirs);
290 if (r < 0)
291 return r;
292
293 r = xdg_user_config_dir(&persistent_config, "/user-tmpfiles.d");
294 if (r < 0 && r != -ENXIO)
295 return r;
296
297 r = xdg_user_runtime_dir(&runtime_config, "/user-tmpfiles.d");
298 if (r < 0 && r != -ENXIO)
299 return r;
300
301 r = xdg_user_data_dir(&data_home, "/user-tmpfiles.d");
302 if (r < 0 && r != -ENXIO)
303 return r;
304
305 r = strv_extend_strv_concat(&res, config_dirs, "/user-tmpfiles.d");
306 if (r < 0)
307 return r;
308
309 r = strv_extend(&res, persistent_config);
310 if (r < 0)
311 return r;
312
313 r = strv_extend(&res, runtime_config);
314 if (r < 0)
315 return r;
316
317 r = strv_extend(&res, data_home);
318 if (r < 0)
319 return r;
320
321 r = strv_extend_strv_concat(&res, data_dirs, "/user-tmpfiles.d");
322 if (r < 0)
323 return r;
324
325 r = path_strv_make_absolute_cwd(res);
326 if (r < 0)
327 return r;
328
329 *ret = TAKE_PTR(res);
330 return 0;
331 }
332
333 static bool needs_glob(ItemType t) {
334 return IN_SET(t,
335 WRITE_FILE,
336 IGNORE_PATH,
337 IGNORE_DIRECTORY_PATH,
338 REMOVE_PATH,
339 RECURSIVE_REMOVE_PATH,
340 EMPTY_DIRECTORY,
341 ADJUST_MODE,
342 RELABEL_PATH,
343 RECURSIVE_RELABEL_PATH,
344 SET_XATTR,
345 RECURSIVE_SET_XATTR,
346 SET_ACL,
347 RECURSIVE_SET_ACL,
348 SET_ATTRIBUTE,
349 RECURSIVE_SET_ATTRIBUTE);
350 }
351
352 static bool takes_ownership(ItemType t) {
353 return IN_SET(t,
354 CREATE_FILE,
355 TRUNCATE_FILE,
356 CREATE_DIRECTORY,
357 EMPTY_DIRECTORY,
358 TRUNCATE_DIRECTORY,
359 CREATE_SUBVOLUME,
360 CREATE_SUBVOLUME_INHERIT_QUOTA,
361 CREATE_SUBVOLUME_NEW_QUOTA,
362 CREATE_FIFO,
363 CREATE_SYMLINK,
364 CREATE_CHAR_DEVICE,
365 CREATE_BLOCK_DEVICE,
366 COPY_FILES,
367 WRITE_FILE,
368 IGNORE_PATH,
369 IGNORE_DIRECTORY_PATH,
370 REMOVE_PATH,
371 RECURSIVE_REMOVE_PATH);
372 }
373
374 static struct Item* find_glob(OrderedHashmap *h, const char *match) {
375 ItemArray *j;
376
377 ORDERED_HASHMAP_FOREACH(j, h) {
378 size_t n;
379
380 for (n = 0; n < j->n_items; n++) {
381 Item *item = j->items + n;
382
383 if (fnmatch(item->path, match, FNM_PATHNAME|FNM_PERIOD) == 0)
384 return item;
385 }
386 }
387
388 return NULL;
389 }
390
391 static int load_unix_sockets(void) {
392 _cleanup_set_free_free_ Set *sockets = NULL;
393 _cleanup_fclose_ FILE *f = NULL;
394 int r;
395
396 if (unix_sockets)
397 return 0;
398
399 /* We maintain a cache of the sockets we found in /proc/net/unix to speed things up a little. */
400
401 sockets = set_new(&path_hash_ops);
402 if (!sockets)
403 return log_oom();
404
405 f = fopen("/proc/net/unix", "re");
406 if (!f)
407 return log_full_errno(errno == ENOENT ? LOG_DEBUG : LOG_WARNING, errno,
408 "Failed to open /proc/net/unix, ignoring: %m");
409
410 /* Skip header */
411 r = read_line(f, LONG_LINE_MAX, NULL);
412 if (r < 0)
413 return log_warning_errno(r, "Failed to skip /proc/net/unix header line: %m");
414 if (r == 0)
415 return log_warning_errno(SYNTHETIC_ERRNO(EIO), "Premature end of file reading /proc/net/unix.");
416
417 for (;;) {
418 _cleanup_free_ char *line = NULL, *s = NULL;
419 char *p;
420
421 r = read_line(f, LONG_LINE_MAX, &line);
422 if (r < 0)
423 return log_warning_errno(r, "Failed to read /proc/net/unix line, ignoring: %m");
424 if (r == 0) /* EOF */
425 break;
426
427 p = strchr(line, ':');
428 if (!p)
429 continue;
430
431 if (strlen(p) < 37)
432 continue;
433
434 p += 37;
435 p += strspn(p, WHITESPACE);
436 p += strcspn(p, WHITESPACE); /* skip one more word */
437 p += strspn(p, WHITESPACE);
438
439 if (*p != '/')
440 continue;
441
442 s = strdup(p);
443 if (!s)
444 return log_oom();
445
446 path_simplify(s, false);
447
448 r = set_consume(sockets, s);
449 if (r == -EEXIST)
450 continue;
451 if (r < 0)
452 return log_warning_errno(r, "Failed to add AF_UNIX socket to set, ignoring: %m");
453
454 TAKE_PTR(s);
455 }
456
457 unix_sockets = TAKE_PTR(sockets);
458 return 1;
459 }
460
461 static bool unix_socket_alive(const char *fn) {
462 assert(fn);
463
464 if (load_unix_sockets() < 0)
465 return true; /* We don't know, so assume yes */
466
467 return !!set_get(unix_sockets, (char*) fn);
468 }
469
470 static DIR* xopendirat_nomod(int dirfd, const char *path) {
471 DIR *dir;
472
473 dir = xopendirat(dirfd, path, O_NOFOLLOW|O_NOATIME);
474 if (dir)
475 return dir;
476
477 log_debug_errno(errno, "Cannot open %sdirectory \"%s\": %m", dirfd == AT_FDCWD ? "" : "sub", path);
478 if (errno != EPERM)
479 return NULL;
480
481 dir = xopendirat(dirfd, path, O_NOFOLLOW);
482 if (!dir)
483 log_debug_errno(errno, "Cannot open %sdirectory \"%s\": %m", dirfd == AT_FDCWD ? "" : "sub", path);
484
485 return dir;
486 }
487
488 static DIR* opendir_nomod(const char *path) {
489 return xopendirat_nomod(AT_FDCWD, path);
490 }
491
492 static inline nsec_t load_statx_timestamp_nsec(const struct statx_timestamp *ts) {
493 assert(ts);
494
495 if (ts->tv_sec < 0)
496 return NSEC_INFINITY;
497
498 if ((nsec_t) ts->tv_sec >= (UINT64_MAX - ts->tv_nsec) / NSEC_PER_SEC)
499 return NSEC_INFINITY;
500
501 return ts->tv_sec * NSEC_PER_SEC + ts->tv_nsec;
502 }
503
504 static int dir_cleanup(
505 Item *i,
506 const char *p,
507 DIR *d,
508 nsec_t self_atime_nsec,
509 nsec_t self_mtime_nsec,
510 nsec_t cutoff_nsec,
511 dev_t rootdev_major,
512 dev_t rootdev_minor,
513 bool mountpoint,
514 int maxdepth,
515 bool keep_this_level) {
516
517 bool deleted = false;
518 struct dirent *dent;
519 int r = 0;
520
521 FOREACH_DIRENT_ALL(dent, d, break) {
522 _cleanup_free_ char *sub_path = NULL;
523 nsec_t atime_nsec, mtime_nsec, ctime_nsec, btime_nsec;
524
525 if (dot_or_dot_dot(dent->d_name))
526 continue;
527
528 /* If statx() is supported, use it. It's preferable over fstatat() since it tells us
529 * explicitly where we are looking at a mount point, for free as side information. Determining
530 * the same information without statx() is hard, see the complexity of path_is_mount_point(),
531 * and also much slower as it requires a number of syscalls instead of just one. Hence, when
532 * we have modern statx() we use it instead of fstat() and do proper mount point checks,
533 * while on older kernels's well do traditional st_dev based detection of mount points.
534 *
535 * Using statx() for detecting mount points also has the benfit that we handle weird file
536 * systems such as overlayfs better where each file is originating from a different
537 * st_dev. */
538
539 STRUCT_STATX_DEFINE(sx);
540
541 r = statx_fallback(
542 dirfd(d), dent->d_name,
543 AT_SYMLINK_NOFOLLOW|AT_NO_AUTOMOUNT,
544 STATX_TYPE|STATX_MODE|STATX_UID|STATX_ATIME|STATX_MTIME|STATX_CTIME|STATX_BTIME,
545 &sx);
546 if (r == -ENOENT)
547 continue;
548 if (r < 0) {
549 /* FUSE, NFS mounts, SELinux might return EACCES */
550 r = log_full_errno(errno == EACCES ? LOG_DEBUG : LOG_ERR, errno,
551 "statx(%s/%s) failed: %m", p, dent->d_name);
552 continue;
553 }
554
555 if (FLAGS_SET(sx.stx_attributes_mask, STATX_ATTR_MOUNT_ROOT)) {
556 /* Yay, we have the mount point API, use it */
557 if (FLAGS_SET(sx.stx_attributes, STATX_ATTR_MOUNT_ROOT)) {
558 log_debug("Ignoring \"%s/%s\": different mount points.", p, dent->d_name);
559 continue;
560 }
561 } else {
562 /* So we might have statx() but the STATX_ATTR_MOUNT_ROOT flag is not supported, fall
563 * back to traditional stx_dev checking. */
564 if (sx.stx_dev_major != rootdev_major ||
565 sx.stx_dev_minor != rootdev_minor) {
566 log_debug("Ignoring \"%s/%s\": different filesystem.", p, dent->d_name);
567 continue;
568 }
569
570 /* Try to detect bind mounts of the same filesystem instance; they do not differ in device
571 * major/minors. This type of query is not supported on all kernels or filesystem types
572 * though. */
573 if (S_ISDIR(sx.stx_mode)) {
574 int q;
575
576 q = fd_is_mount_point(dirfd(d), dent->d_name, 0);
577 if (q < 0)
578 log_debug_errno(q, "Failed to determine whether \"%s/%s\" is a mount point, ignoring: %m", p, dent->d_name);
579 else if (q > 0) {
580 log_debug("Ignoring \"%s/%s\": different mount of the same filesystem.", p, dent->d_name);
581 continue;
582 }
583 }
584 }
585
586 atime_nsec = FLAGS_SET(sx.stx_mask, STATX_ATIME) ? load_statx_timestamp_nsec(&sx.stx_atime) : 0;
587 mtime_nsec = FLAGS_SET(sx.stx_mask, STATX_MTIME) ? load_statx_timestamp_nsec(&sx.stx_mtime) : 0;
588 ctime_nsec = FLAGS_SET(sx.stx_mask, STATX_CTIME) ? load_statx_timestamp_nsec(&sx.stx_ctime) : 0;
589 btime_nsec = FLAGS_SET(sx.stx_mask, STATX_BTIME) ? load_statx_timestamp_nsec(&sx.stx_btime) : 0;
590
591 sub_path = path_join(p, dent->d_name);
592 if (!sub_path) {
593 r = log_oom();
594 goto finish;
595 }
596
597 /* Is there an item configured for this path? */
598 if (ordered_hashmap_get(items, sub_path)) {
599 log_debug("Ignoring \"%s\": a separate entry exists.", sub_path);
600 continue;
601 }
602
603 if (find_glob(globs, sub_path)) {
604 log_debug("Ignoring \"%s\": a separate glob exists.", sub_path);
605 continue;
606 }
607
608 if (S_ISDIR(sx.stx_mode)) {
609 _cleanup_closedir_ DIR *sub_dir = NULL;
610
611 if (mountpoint &&
612 streq(dent->d_name, "lost+found") &&
613 sx.stx_uid == 0) {
614 log_debug("Ignoring directory \"%s\".", sub_path);
615 continue;
616 }
617
618 if (maxdepth <= 0)
619 log_warning("Reached max depth on \"%s\".", sub_path);
620 else {
621 int q;
622
623 sub_dir = xopendirat_nomod(dirfd(d), dent->d_name);
624 if (!sub_dir) {
625 if (errno != ENOENT)
626 r = log_warning_errno(errno, "Opening directory \"%s\" failed, ignoring: %m", sub_path);
627
628 continue;
629 }
630
631 if (flock(dirfd(sub_dir), LOCK_EX|LOCK_NB) < 0) {
632 log_debug_errno(errno, "Couldn't acquire shared BSD lock on directory \"%s\", skipping: %m", p);
633 continue;
634 }
635
636 q = dir_cleanup(i,
637 sub_path, sub_dir,
638 atime_nsec, mtime_nsec, cutoff_nsec,
639 rootdev_major, rootdev_minor,
640 false, maxdepth-1, false);
641 if (q < 0)
642 r = q;
643 }
644
645 /* Note: if you are wondering why we don't support the sticky bit for excluding
646 * directories from cleaning like we do it for other file system objects: well, the
647 * sticky bit already has a meaning for directories, so we don't want to overload
648 * that. */
649
650 if (keep_this_level) {
651 log_debug("Keeping directory \"%s\".", sub_path);
652 continue;
653 }
654
655 /* Ignore ctime, we change it when deleting */
656 if (mtime_nsec != NSEC_INFINITY && mtime_nsec >= cutoff_nsec) {
657 char a[FORMAT_TIMESTAMP_MAX];
658 /* Follows spelling in stat(1). */
659 log_debug("Directory \"%s\": modify time %s is too new.",
660 sub_path,
661 format_timestamp_style(a, sizeof(a), mtime_nsec / NSEC_PER_USEC, TIMESTAMP_US));
662 continue;
663 }
664
665 if (atime_nsec != NSEC_INFINITY && atime_nsec >= cutoff_nsec) {
666 char a[FORMAT_TIMESTAMP_MAX];
667 log_debug("Directory \"%s\": access time %s is too new.",
668 sub_path,
669 format_timestamp_style(a, sizeof(a), atime_nsec / NSEC_PER_USEC, TIMESTAMP_US));
670 continue;
671 }
672
673 if (btime_nsec != NSEC_INFINITY && btime_nsec >= cutoff_nsec) {
674 char a[FORMAT_TIMESTAMP_MAX];
675 log_debug("Directory \"%s\": birth time %s is too new.",
676 sub_path,
677 format_timestamp_style(a, sizeof(a), btime_nsec / NSEC_PER_USEC, TIMESTAMP_US));
678 continue;
679 }
680
681 log_debug("Removing directory \"%s\".", sub_path);
682 if (unlinkat(dirfd(d), dent->d_name, AT_REMOVEDIR) < 0)
683 if (!IN_SET(errno, ENOENT, ENOTEMPTY))
684 r = log_warning_errno(errno, "Failed to remove directory \"%s\", ignoring: %m", sub_path);
685
686 } else {
687 /* Skip files for which the sticky bit is set. These are semantics we define, and are
688 * unknown elsewhere. See XDG_RUNTIME_DIR specification for details. */
689 if (sx.stx_mode & S_ISVTX) {
690 log_debug("Skipping \"%s\": sticky bit set.", sub_path);
691 continue;
692 }
693
694 if (mountpoint &&
695 S_ISREG(sx.stx_mode) &&
696 sx.stx_uid == 0 &&
697 STR_IN_SET(dent->d_name,
698 ".journal",
699 "aquota.user",
700 "aquota.group")) {
701 log_debug("Skipping \"%s\".", sub_path);
702 continue;
703 }
704
705 /* Ignore sockets that are listed in /proc/net/unix */
706 if (S_ISSOCK(sx.stx_mode) && unix_socket_alive(sub_path)) {
707 log_debug("Skipping \"%s\": live socket.", sub_path);
708 continue;
709 }
710
711 /* Ignore device nodes */
712 if (S_ISCHR(sx.stx_mode) || S_ISBLK(sx.stx_mode)) {
713 log_debug("Skipping \"%s\": a device.", sub_path);
714 continue;
715 }
716
717 /* Keep files on this level around if this is requested */
718 if (keep_this_level) {
719 log_debug("Keeping \"%s\".", sub_path);
720 continue;
721 }
722
723 if (mtime_nsec != NSEC_INFINITY && mtime_nsec >= cutoff_nsec) {
724 char a[FORMAT_TIMESTAMP_MAX];
725 /* Follows spelling in stat(1). */
726 log_debug("File \"%s\": modify time %s is too new.",
727 sub_path,
728 format_timestamp_style(a, sizeof(a), mtime_nsec / NSEC_PER_USEC, TIMESTAMP_US));
729 continue;
730 }
731
732 if (atime_nsec != NSEC_INFINITY && atime_nsec >= cutoff_nsec) {
733 char a[FORMAT_TIMESTAMP_MAX];
734 log_debug("File \"%s\": access time %s is too new.",
735 sub_path,
736 format_timestamp_style(a, sizeof(a), atime_nsec / NSEC_PER_USEC, TIMESTAMP_US));
737 continue;
738 }
739
740 if (ctime_nsec != NSEC_INFINITY && ctime_nsec >= cutoff_nsec) {
741 char a[FORMAT_TIMESTAMP_MAX];
742 log_debug("File \"%s\": change time %s is too new.",
743 sub_path,
744 format_timestamp_style(a, sizeof(a), ctime_nsec / NSEC_PER_USEC, TIMESTAMP_US));
745 continue;
746 }
747
748 if (btime_nsec != NSEC_INFINITY && btime_nsec >= cutoff_nsec) {
749 char a[FORMAT_TIMESTAMP_MAX];
750 log_debug("File \"%s\": birth time %s is too new.",
751 sub_path,
752 format_timestamp_style(a, sizeof(a), btime_nsec / NSEC_PER_USEC, TIMESTAMP_US));
753 continue;
754 }
755
756 log_debug("Removing \"%s\".", sub_path);
757 if (unlinkat(dirfd(d), dent->d_name, 0) < 0)
758 if (errno != ENOENT)
759 r = log_warning_errno(errno, "Failed to remove \"%s\", ignoring: %m", sub_path);
760
761 deleted = true;
762 }
763 }
764
765 finish:
766 if (deleted) {
767 char a[FORMAT_TIMESTAMP_MAX], m[FORMAT_TIMESTAMP_MAX];
768 struct timespec ts[2];
769
770 log_debug("Restoring access and modification time on \"%s\": %s, %s",
771 p,
772 format_timestamp_style(a, sizeof(a), self_atime_nsec / NSEC_PER_USEC, TIMESTAMP_US),
773 format_timestamp_style(m, sizeof(m), self_mtime_nsec / NSEC_PER_USEC, TIMESTAMP_US));
774
775 timespec_store_nsec(ts + 0, self_atime_nsec);
776 timespec_store_nsec(ts + 1, self_mtime_nsec);
777
778 /* Restore original directory timestamps */
779 if (futimens(dirfd(d), ts) < 0)
780 log_warning_errno(errno, "Failed to revert timestamps of '%s', ignoring: %m", p);
781 }
782
783 return r;
784 }
785
786 static bool dangerous_hardlinks(void) {
787 _cleanup_free_ char *value = NULL;
788 static int cached = -1;
789 int r;
790
791 /* Check whether the fs.protected_hardlinks sysctl is on. If we can't determine it we assume its off, as that's
792 * what the upstream default is. */
793
794 if (cached >= 0)
795 return cached;
796
797 r = read_one_line_file("/proc/sys/fs/protected_hardlinks", &value);
798 if (r < 0) {
799 log_debug_errno(r, "Failed to read fs.protected_hardlinks sysctl: %m");
800 return true;
801 }
802
803 r = parse_boolean(value);
804 if (r < 0) {
805 log_debug_errno(r, "Failed to parse fs.protected_hardlinks sysctl: %m");
806 return true;
807 }
808
809 cached = r == 0;
810 return cached;
811 }
812
813 static bool hardlink_vulnerable(const struct stat *st) {
814 assert(st);
815
816 return !S_ISDIR(st->st_mode) && st->st_nlink > 1 && dangerous_hardlinks();
817 }
818
819 static mode_t process_mask_perms(mode_t mode, mode_t current) {
820
821 if ((current & 0111) == 0)
822 mode &= ~0111;
823 if ((current & 0222) == 0)
824 mode &= ~0222;
825 if ((current & 0444) == 0)
826 mode &= ~0444;
827 if (!S_ISDIR(current))
828 mode &= ~07000; /* remove sticky/sgid/suid bit, unless directory */
829
830 return mode;
831 }
832
833 static int fd_set_perms(Item *i, int fd, const char *path, const struct stat *st) {
834 struct stat stbuf;
835 mode_t new_mode;
836 bool do_chown;
837 int r;
838
839 assert(i);
840 assert(fd);
841 assert(path);
842
843 if (!i->mode_set && !i->uid_set && !i->gid_set)
844 goto shortcut;
845
846 if (!st) {
847 if (fstat(fd, &stbuf) < 0)
848 return log_error_errno(errno, "fstat(%s) failed: %m", path);
849 st = &stbuf;
850 }
851
852 if (hardlink_vulnerable(st))
853 return log_error_errno(SYNTHETIC_ERRNO(EPERM),
854 "Refusing to set permissions on hardlinked file %s while the fs.protected_hardlinks sysctl is turned off.",
855 path);
856
857 /* Do we need a chown()? */
858 do_chown =
859 (i->uid_set && i->uid != st->st_uid) ||
860 (i->gid_set && i->gid != st->st_gid);
861
862 /* Calculate the mode to apply */
863 new_mode = i->mode_set ? (i->mask_perms ?
864 process_mask_perms(i->mode, st->st_mode) :
865 i->mode) :
866 (st->st_mode & 07777);
867
868 if (i->mode_set && do_chown) {
869 /* Before we issue the chmod() let's reduce the access mode to the common bits of the old and
870 * the new mode. That way there's no time window where the file exists under the old owner
871 * with more than the old access modes — and not under the new owner with more than the new
872 * access modes either. */
873
874 if (S_ISLNK(st->st_mode))
875 log_debug("Skipping temporary mode fix for symlink %s.", path);
876 else {
877 mode_t m = new_mode & st->st_mode; /* Mask new mode by old mode */
878
879 if (((m ^ st->st_mode) & 07777) == 0)
880 log_debug("\"%s\" matches temporary mode %o already.", path, m);
881 else {
882 log_debug("Temporarily changing \"%s\" to mode %o.", path, m);
883 r = fchmod_opath(fd, m);
884 if (r < 0)
885 return log_error_errno(r, "fchmod() of %s failed: %m", path);
886 }
887 }
888 }
889
890 if (do_chown) {
891 log_debug("Changing \"%s\" to owner "UID_FMT":"GID_FMT,
892 path,
893 i->uid_set ? i->uid : UID_INVALID,
894 i->gid_set ? i->gid : GID_INVALID);
895
896 if (fchownat(fd,
897 "",
898 i->uid_set ? i->uid : UID_INVALID,
899 i->gid_set ? i->gid : GID_INVALID,
900 AT_EMPTY_PATH) < 0)
901 return log_error_errno(errno, "fchownat() of %s failed: %m", path);
902 }
903
904 /* Now, apply the final mode. We do this in two cases: when the user set a mode explicitly, or after a
905 * chown(), since chown()'s mangle the access mode in regards to sgid/suid in some conditions. */
906 if (i->mode_set || do_chown) {
907 if (S_ISLNK(st->st_mode))
908 log_debug("Skipping mode fix for symlink %s.", path);
909 else {
910 /* Check if the chmod() is unnecessary. Note that if we did a chown() before we always
911 * chmod() here again, since it might have mangled the bits. */
912 if (!do_chown && ((new_mode ^ st->st_mode) & 07777) == 0)
913 log_debug("\"%s\" matches mode %o already.", path, new_mode);
914 else {
915 log_debug("Changing \"%s\" to mode %o.", path, new_mode);
916 r = fchmod_opath(fd, new_mode);
917 if (r < 0)
918 return log_error_errno(r, "fchmod() of %s failed: %m", path);
919 }
920 }
921 }
922
923 shortcut:
924 return label_fix(path, 0);
925 }
926
927 static int path_open_parent_safe(const char *path) {
928 _cleanup_free_ char *dn = NULL;
929 int r, fd;
930
931 if (path_equal(path, "/") || !path_is_normalized(path))
932 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
933 "Failed to open parent of '%s': invalid path.",
934 path);
935
936 dn = dirname_malloc(path);
937 if (!dn)
938 return log_oom();
939
940 r = chase_symlinks(dn, arg_root, CHASE_SAFE|CHASE_WARN, NULL, &fd);
941 if (r < 0 && r != -ENOLINK)
942 return log_error_errno(r, "Failed to validate path %s: %m", path);
943
944 return r < 0 ? r : fd;
945 }
946
947 static int path_open_safe(const char *path) {
948 int r, fd;
949
950 /* path_open_safe() returns a file descriptor opened with O_PATH after
951 * verifying that the path doesn't contain unsafe transitions, except
952 * for its final component as the function does not follow symlink. */
953
954 assert(path);
955
956 if (!path_is_normalized(path))
957 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
958 "Failed to open invalid path '%s'.",
959 path);
960
961 r = chase_symlinks(path, arg_root, CHASE_SAFE|CHASE_WARN|CHASE_NOFOLLOW, NULL, &fd);
962 if (r < 0 && r != -ENOLINK)
963 return log_error_errno(r, "Failed to validate path %s: %m", path);
964
965 return r < 0 ? r : fd;
966 }
967
968 static int path_set_perms(Item *i, const char *path) {
969 _cleanup_close_ int fd = -1;
970
971 assert(i);
972 assert(path);
973
974 fd = path_open_safe(path);
975 if (fd < 0)
976 return fd;
977
978 return fd_set_perms(i, fd, path, NULL);
979 }
980
981 static int parse_xattrs_from_arg(Item *i) {
982 const char *p;
983 int r;
984
985 assert(i);
986 assert(i->argument);
987
988 p = i->argument;
989
990 for (;;) {
991 _cleanup_free_ char *name = NULL, *value = NULL, *xattr = NULL;
992
993 r = extract_first_word(&p, &xattr, NULL, EXTRACT_UNQUOTE|EXTRACT_CUNESCAPE);
994 if (r < 0)
995 log_warning_errno(r, "Failed to parse extended attribute '%s', ignoring: %m", p);
996 if (r <= 0)
997 break;
998
999 r = split_pair(xattr, "=", &name, &value);
1000 if (r < 0) {
1001 log_warning_errno(r, "Failed to parse extended attribute, ignoring: %s", xattr);
1002 continue;
1003 }
1004
1005 if (isempty(name) || isempty(value)) {
1006 log_warning("Malformed extended attribute found, ignoring: %s", xattr);
1007 continue;
1008 }
1009
1010 if (strv_push_pair(&i->xattrs, name, value) < 0)
1011 return log_oom();
1012
1013 name = value = NULL;
1014 }
1015
1016 return 0;
1017 }
1018
1019 static int fd_set_xattrs(Item *i, int fd, const char *path, const struct stat *st) {
1020 char procfs_path[STRLEN("/proc/self/fd/") + DECIMAL_STR_MAX(int)];
1021 char **name, **value;
1022
1023 assert(i);
1024 assert(fd);
1025 assert(path);
1026
1027 xsprintf(procfs_path, "/proc/self/fd/%i", fd);
1028
1029 STRV_FOREACH_PAIR(name, value, i->xattrs) {
1030 log_debug("Setting extended attribute '%s=%s' on %s.", *name, *value, path);
1031 if (setxattr(procfs_path, *name, *value, strlen(*value), 0) < 0)
1032 return log_error_errno(errno, "Setting extended attribute %s=%s on %s failed: %m",
1033 *name, *value, path);
1034 }
1035 return 0;
1036 }
1037
1038 static int path_set_xattrs(Item *i, const char *path) {
1039 _cleanup_close_ int fd = -1;
1040
1041 assert(i);
1042 assert(path);
1043
1044 fd = path_open_safe(path);
1045 if (fd < 0)
1046 return fd;
1047
1048 return fd_set_xattrs(i, fd, path, NULL);
1049 }
1050
1051 static int parse_acls_from_arg(Item *item) {
1052 #if HAVE_ACL
1053 int r;
1054
1055 assert(item);
1056
1057 /* If append_or_force (= modify) is set, we will not modify the acl
1058 * afterwards, so the mask can be added now if necessary. */
1059
1060 r = parse_acl(item->argument, &item->acl_access, &item->acl_default, !item->append_or_force);
1061 if (r < 0)
1062 log_warning_errno(r, "Failed to parse ACL \"%s\": %m. Ignoring", item->argument);
1063 #else
1064 log_warning("ACLs are not supported. Ignoring.");
1065 #endif
1066
1067 return 0;
1068 }
1069
1070 #if HAVE_ACL
1071 static int path_set_acl(const char *path, const char *pretty, acl_type_t type, acl_t acl, bool modify) {
1072 _cleanup_(acl_free_charpp) char *t = NULL;
1073 _cleanup_(acl_freep) acl_t dup = NULL;
1074 int r;
1075
1076 /* Returns 0 for success, positive error if already warned,
1077 * negative error otherwise. */
1078
1079 if (modify) {
1080 r = acls_for_file(path, type, acl, &dup);
1081 if (r < 0)
1082 return r;
1083
1084 r = calc_acl_mask_if_needed(&dup);
1085 if (r < 0)
1086 return r;
1087 } else {
1088 dup = acl_dup(acl);
1089 if (!dup)
1090 return -errno;
1091
1092 /* the mask was already added earlier if needed */
1093 }
1094
1095 r = add_base_acls_if_needed(&dup, path);
1096 if (r < 0)
1097 return r;
1098
1099 t = acl_to_any_text(dup, NULL, ',', TEXT_ABBREVIATE);
1100 log_debug("Setting %s ACL %s on %s.",
1101 type == ACL_TYPE_ACCESS ? "access" : "default",
1102 strna(t), pretty);
1103
1104 r = acl_set_file(path, type, dup);
1105 if (r < 0) {
1106 if (ERRNO_IS_NOT_SUPPORTED(errno))
1107 /* No error if filesystem doesn't support ACLs. Return negative. */
1108 return -errno;
1109 else
1110 /* Return positive to indicate we already warned */
1111 return -log_error_errno(errno,
1112 "Setting %s ACL \"%s\" on %s failed: %m",
1113 type == ACL_TYPE_ACCESS ? "access" : "default",
1114 strna(t), pretty);
1115 }
1116 return 0;
1117 }
1118 #endif
1119
1120 static int fd_set_acls(Item *item, int fd, const char *path, const struct stat *st) {
1121 int r = 0;
1122 #if HAVE_ACL
1123 char procfs_path[STRLEN("/proc/self/fd/") + DECIMAL_STR_MAX(int)];
1124 struct stat stbuf;
1125
1126 assert(item);
1127 assert(fd);
1128 assert(path);
1129
1130 if (!st) {
1131 if (fstat(fd, &stbuf) < 0)
1132 return log_error_errno(errno, "fstat(%s) failed: %m", path);
1133 st = &stbuf;
1134 }
1135
1136 if (hardlink_vulnerable(st))
1137 return log_error_errno(SYNTHETIC_ERRNO(EPERM),
1138 "Refusing to set ACLs on hardlinked file %s while the fs.protected_hardlinks sysctl is turned off.",
1139 path);
1140
1141 if (S_ISLNK(st->st_mode)) {
1142 log_debug("Skipping ACL fix for symlink %s.", path);
1143 return 0;
1144 }
1145
1146 xsprintf(procfs_path, "/proc/self/fd/%i", fd);
1147
1148 if (item->acl_access)
1149 r = path_set_acl(procfs_path, path, ACL_TYPE_ACCESS, item->acl_access, item->append_or_force);
1150
1151 /* set only default acls to folders */
1152 if (r == 0 && item->acl_default && S_ISDIR(st->st_mode))
1153 r = path_set_acl(procfs_path, path, ACL_TYPE_DEFAULT, item->acl_default, item->append_or_force);
1154
1155 if (ERRNO_IS_NOT_SUPPORTED(r)) {
1156 log_debug_errno(r, "ACLs not supported by file system at %s", path);
1157 return 0;
1158 }
1159
1160 if (r > 0)
1161 return -r; /* already warned */
1162
1163 /* The above procfs paths don't work if /proc is not mounted. */
1164 if (r == -ENOENT && proc_mounted() == 0)
1165 r = -ENOSYS;
1166
1167 if (r < 0)
1168 return log_error_errno(r, "ACL operation on \"%s\" failed: %m", path);
1169 #endif
1170 return r;
1171 }
1172
1173 static int path_set_acls(Item *item, const char *path) {
1174 int r = 0;
1175 #if HAVE_ACL
1176 _cleanup_close_ int fd = -1;
1177
1178 assert(item);
1179 assert(path);
1180
1181 fd = path_open_safe(path);
1182 if (fd < 0)
1183 return fd;
1184
1185 r = fd_set_acls(item, fd, path, NULL);
1186 #endif
1187 return r;
1188 }
1189
1190 static int parse_attribute_from_arg(Item *item) {
1191
1192 static const struct {
1193 char character;
1194 unsigned value;
1195 } attributes[] = {
1196 { 'A', FS_NOATIME_FL }, /* do not update atime */
1197 { 'S', FS_SYNC_FL }, /* Synchronous updates */
1198 { 'D', FS_DIRSYNC_FL }, /* dirsync behaviour (directories only) */
1199 { 'a', FS_APPEND_FL }, /* writes to file may only append */
1200 { 'c', FS_COMPR_FL }, /* Compress file */
1201 { 'd', FS_NODUMP_FL }, /* do not dump file */
1202 { 'e', FS_EXTENT_FL }, /* Extents */
1203 { 'i', FS_IMMUTABLE_FL }, /* Immutable file */
1204 { 'j', FS_JOURNAL_DATA_FL }, /* Reserved for ext3 */
1205 { 's', FS_SECRM_FL }, /* Secure deletion */
1206 { 'u', FS_UNRM_FL }, /* Undelete */
1207 { 't', FS_NOTAIL_FL }, /* file tail should not be merged */
1208 { 'T', FS_TOPDIR_FL }, /* Top of directory hierarchies */
1209 { 'C', FS_NOCOW_FL }, /* Do not cow file */
1210 { 'P', FS_PROJINHERIT_FL }, /* Inherit the quota project ID */
1211 };
1212
1213 enum {
1214 MODE_ADD,
1215 MODE_DEL,
1216 MODE_SET
1217 } mode = MODE_ADD;
1218
1219 unsigned value = 0, mask = 0;
1220 const char *p;
1221
1222 assert(item);
1223
1224 p = item->argument;
1225 if (p) {
1226 if (*p == '+') {
1227 mode = MODE_ADD;
1228 p++;
1229 } else if (*p == '-') {
1230 mode = MODE_DEL;
1231 p++;
1232 } else if (*p == '=') {
1233 mode = MODE_SET;
1234 p++;
1235 }
1236 }
1237
1238 if (isempty(p) && mode != MODE_SET)
1239 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
1240 "Setting file attribute on '%s' needs an attribute specification.",
1241 item->path);
1242
1243 for (; p && *p ; p++) {
1244 unsigned i, v;
1245
1246 for (i = 0; i < ELEMENTSOF(attributes); i++)
1247 if (*p == attributes[i].character)
1248 break;
1249
1250 if (i >= ELEMENTSOF(attributes))
1251 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
1252 "Unknown file attribute '%c' on '%s'.",
1253 *p, item->path);
1254
1255 v = attributes[i].value;
1256
1257 SET_FLAG(value, v, IN_SET(mode, MODE_ADD, MODE_SET));
1258
1259 mask |= v;
1260 }
1261
1262 if (mode == MODE_SET)
1263 mask |= CHATTR_ALL_FL;
1264
1265 assert(mask != 0);
1266
1267 item->attribute_mask = mask;
1268 item->attribute_value = value;
1269 item->attribute_set = true;
1270
1271 return 0;
1272 }
1273
1274 static int fd_set_attribute(Item *item, int fd, const char *path, const struct stat *st) {
1275 _cleanup_close_ int procfs_fd = -1;
1276 struct stat stbuf;
1277 unsigned f;
1278 int r;
1279
1280 assert(item);
1281 assert(fd);
1282 assert(path);
1283
1284 if (!item->attribute_set || item->attribute_mask == 0)
1285 return 0;
1286
1287 if (!st) {
1288 if (fstat(fd, &stbuf) < 0)
1289 return log_error_errno(errno, "fstat(%s) failed: %m", path);
1290 st = &stbuf;
1291 }
1292
1293 /* Issuing the file attribute ioctls on device nodes is not
1294 * safe, as that will be delivered to the drivers, not the
1295 * file system containing the device node. */
1296 if (!S_ISREG(st->st_mode) && !S_ISDIR(st->st_mode))
1297 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
1298 "Setting file flags is only supported on regular files and directories, cannot set on '%s'.",
1299 path);
1300
1301 f = item->attribute_value & item->attribute_mask;
1302
1303 /* Mask away directory-specific flags */
1304 if (!S_ISDIR(st->st_mode))
1305 f &= ~FS_DIRSYNC_FL;
1306
1307 procfs_fd = fd_reopen(fd, O_RDONLY|O_CLOEXEC|O_NOATIME);
1308 if (procfs_fd < 0)
1309 return log_error_errno(procfs_fd, "Failed to re-open '%s': %m", path);
1310
1311 unsigned previous, current;
1312 r = chattr_full(NULL, procfs_fd, f, item->attribute_mask, &previous, &current, true);
1313 if (r == -ENOANO)
1314 log_warning("Cannot set file attributes for '%s', maybe due to incompatibility in specified attributes, "
1315 "previous=0x%08x, current=0x%08x, expected=0x%08x, ignoring.",
1316 path, previous, current, (previous & ~item->attribute_mask) | (f & item->attribute_mask));
1317 else if (r < 0)
1318 log_full_errno(ERRNO_IS_NOT_SUPPORTED(r) ? LOG_DEBUG : LOG_WARNING, r,
1319 "Cannot set file attributes for '%s', value=0x%08x, mask=0x%08x, ignoring: %m",
1320 path, item->attribute_value, item->attribute_mask);
1321
1322 return 0;
1323 }
1324
1325 static int path_set_attribute(Item *item, const char *path) {
1326 _cleanup_close_ int fd = -1;
1327
1328 if (!item->attribute_set || item->attribute_mask == 0)
1329 return 0;
1330
1331 fd = path_open_safe(path);
1332 if (fd < 0)
1333 return fd;
1334
1335 return fd_set_attribute(item, fd, path, NULL);
1336 }
1337
1338 static int write_one_file(Item *i, const char *path) {
1339 _cleanup_close_ int fd = -1, dir_fd = -1;
1340 char *bn;
1341 int r;
1342
1343 assert(i);
1344 assert(path);
1345 assert(i->argument);
1346 assert(i->type == WRITE_FILE);
1347
1348 /* Validate the path and keep the fd on the directory for opening the
1349 * file so we're sure that it can't be changed behind our back. */
1350 dir_fd = path_open_parent_safe(path);
1351 if (dir_fd < 0)
1352 return dir_fd;
1353
1354 bn = basename(path);
1355
1356 /* Follows symlinks */
1357 fd = openat(dir_fd, bn,
1358 O_NONBLOCK|O_CLOEXEC|O_WRONLY|O_NOCTTY|(i->append_or_force ? O_APPEND : 0),
1359 i->mode);
1360 if (fd < 0) {
1361 if (errno == ENOENT) {
1362 log_debug_errno(errno, "Not writing missing file \"%s\": %m", path);
1363 return 0;
1364 }
1365
1366 if (i->allow_failure)
1367 return log_debug_errno(errno, "Failed to open file \"%s\", ignoring: %m", path);
1368
1369 return log_error_errno(errno, "Failed to open file \"%s\": %m", path);
1370 }
1371
1372 /* 'w' is allowed to write into any kind of files. */
1373 log_debug("Writing to \"%s\".", path);
1374
1375 r = loop_write(fd, i->argument, strlen(i->argument), false);
1376 if (r < 0)
1377 return log_error_errno(r, "Failed to write file \"%s\": %m", path);
1378
1379 return fd_set_perms(i, fd, path, NULL);
1380 }
1381
1382 static int create_file(Item *i, const char *path) {
1383 _cleanup_close_ int fd = -1, dir_fd = -1;
1384 struct stat stbuf, *st = NULL;
1385 int r = 0;
1386 char *bn;
1387
1388 assert(i);
1389 assert(path);
1390 assert(i->type == CREATE_FILE);
1391
1392 /* 'f' operates on regular files exclusively. */
1393
1394 /* Validate the path and keep the fd on the directory for opening the
1395 * file so we're sure that it can't be changed behind our back. */
1396 dir_fd = path_open_parent_safe(path);
1397 if (dir_fd < 0)
1398 return dir_fd;
1399
1400 bn = basename(path);
1401
1402 RUN_WITH_UMASK(0000) {
1403 mac_selinux_create_file_prepare(path, S_IFREG);
1404 fd = openat(dir_fd, bn, O_CREAT|O_EXCL|O_NOFOLLOW|O_NONBLOCK|O_CLOEXEC|O_WRONLY|O_NOCTTY, i->mode);
1405 mac_selinux_create_file_clear();
1406 }
1407
1408 if (fd < 0) {
1409 /* Even on a read-only filesystem, open(2) returns EEXIST if the
1410 * file already exists. It returns EROFS only if it needs to
1411 * create the file. */
1412 if (errno != EEXIST)
1413 return log_error_errno(errno, "Failed to create file %s: %m", path);
1414
1415 /* Re-open the file. At that point it must exist since open(2)
1416 * failed with EEXIST. We still need to check if the perms/mode
1417 * need to be changed. For read-only filesystems, we let
1418 * fd_set_perms() report the error if the perms need to be
1419 * modified. */
1420 fd = openat(dir_fd, bn, O_NOFOLLOW|O_CLOEXEC|O_PATH, i->mode);
1421 if (fd < 0)
1422 return log_error_errno(errno, "Failed to re-open file %s: %m", path);
1423
1424 if (fstat(fd, &stbuf) < 0)
1425 return log_error_errno(errno, "stat(%s) failed: %m", path);
1426
1427 if (!S_ISREG(stbuf.st_mode))
1428 return log_error_errno(SYNTHETIC_ERRNO(EEXIST),
1429 "%s exists and is not a regular file.",
1430 path);
1431
1432 st = &stbuf;
1433 } else {
1434
1435 log_debug("\"%s\" has been created.", path);
1436
1437 if (i->argument) {
1438 log_debug("Writing to \"%s\".", path);
1439
1440 r = loop_write(fd, i->argument, strlen(i->argument), false);
1441 if (r < 0)
1442 return log_error_errno(r, "Failed to write file \"%s\": %m", path);
1443 }
1444 }
1445
1446 return fd_set_perms(i, fd, path, st);
1447 }
1448
1449 static int truncate_file(Item *i, const char *path) {
1450 _cleanup_close_ int fd = -1, dir_fd = -1;
1451 struct stat stbuf, *st = NULL;
1452 bool erofs = false;
1453 int r = 0;
1454 char *bn;
1455
1456 assert(i);
1457 assert(path);
1458 assert(i->type == TRUNCATE_FILE || (i->type == CREATE_FILE && i->append_or_force));
1459
1460 /* We want to operate on regular file exclusively especially since
1461 * O_TRUNC is unspecified if the file is neither a regular file nor a
1462 * fifo nor a terminal device. Therefore we first open the file and make
1463 * sure it's a regular one before truncating it. */
1464
1465 /* Validate the path and keep the fd on the directory for opening the
1466 * file so we're sure that it can't be changed behind our back. */
1467 dir_fd = path_open_parent_safe(path);
1468 if (dir_fd < 0)
1469 return dir_fd;
1470
1471 bn = basename(path);
1472
1473 RUN_WITH_UMASK(0000) {
1474 mac_selinux_create_file_prepare(path, S_IFREG);
1475 fd = openat(dir_fd, bn, O_CREAT|O_NOFOLLOW|O_NONBLOCK|O_CLOEXEC|O_WRONLY|O_NOCTTY, i->mode);
1476 mac_selinux_create_file_clear();
1477 }
1478
1479 if (fd < 0) {
1480 if (errno != EROFS)
1481 return log_error_errno(errno, "Failed to open/create file %s: %m", path);
1482
1483 /* On a read-only filesystem, we don't want to fail if the
1484 * target is already empty and the perms are set. So we still
1485 * proceed with the sanity checks and let the remaining
1486 * operations fail with EROFS if they try to modify the target
1487 * file. */
1488
1489 fd = openat(dir_fd, bn, O_NOFOLLOW|O_CLOEXEC|O_PATH, i->mode);
1490 if (fd < 0) {
1491 if (errno == ENOENT)
1492 return log_error_errno(SYNTHETIC_ERRNO(EROFS),
1493 "Cannot create file %s on a read-only file system.",
1494 path);
1495
1496 return log_error_errno(errno, "Failed to re-open file %s: %m", path);
1497 }
1498
1499 erofs = true;
1500 }
1501
1502 if (fstat(fd, &stbuf) < 0)
1503 return log_error_errno(errno, "stat(%s) failed: %m", path);
1504
1505 if (!S_ISREG(stbuf.st_mode))
1506 return log_error_errno(SYNTHETIC_ERRNO(EEXIST),
1507 "%s exists and is not a regular file.",
1508 path);
1509
1510 if (stbuf.st_size > 0) {
1511 if (ftruncate(fd, 0) < 0) {
1512 r = erofs ? -EROFS : -errno;
1513 return log_error_errno(r, "Failed to truncate file %s: %m", path);
1514 }
1515 } else
1516 st = &stbuf;
1517
1518 log_debug("\"%s\" has been created.", path);
1519
1520 if (i->argument) {
1521 log_debug("Writing to \"%s\".", path);
1522
1523 r = loop_write(fd, i->argument, strlen(i->argument), false);
1524 if (r < 0) {
1525 r = erofs ? -EROFS : r;
1526 return log_error_errno(r, "Failed to write file %s: %m", path);
1527 }
1528 }
1529
1530 return fd_set_perms(i, fd, path, st);
1531 }
1532
1533 static int copy_files(Item *i) {
1534 _cleanup_close_ int dfd = -1, fd = -1;
1535 char *bn;
1536 int r;
1537
1538 log_debug("Copying tree \"%s\" to \"%s\".", i->argument, i->path);
1539
1540 bn = basename(i->path);
1541
1542 /* Validate the path and use the returned directory fd for copying the
1543 * target so we're sure that the path can't be changed behind our
1544 * back. */
1545 dfd = path_open_parent_safe(i->path);
1546 if (dfd < 0)
1547 return dfd;
1548
1549 r = copy_tree_at(AT_FDCWD, i->argument,
1550 dfd, bn,
1551 i->uid_set ? i->uid : UID_INVALID,
1552 i->gid_set ? i->gid : GID_INVALID,
1553 COPY_REFLINK | COPY_MERGE_EMPTY | COPY_MAC_CREATE | COPY_HARDLINKS);
1554 if (r < 0) {
1555 struct stat a, b;
1556
1557 /* If the target already exists on read-only filesystems, trying
1558 * to create the target will not fail with EEXIST but with
1559 * EROFS. */
1560 if (r == -EROFS && faccessat(dfd, bn, F_OK, AT_SYMLINK_NOFOLLOW) == 0)
1561 r = -EEXIST;
1562
1563 if (r != -EEXIST)
1564 return log_error_errno(r, "Failed to copy files to %s: %m", i->path);
1565
1566 if (stat(i->argument, &a) < 0)
1567 return log_error_errno(errno, "stat(%s) failed: %m", i->argument);
1568
1569 if (fstatat(dfd, bn, &b, AT_SYMLINK_NOFOLLOW) < 0)
1570 return log_error_errno(errno, "stat(%s) failed: %m", i->path);
1571
1572 if ((a.st_mode ^ b.st_mode) & S_IFMT) {
1573 log_debug("Can't copy to %s, file exists already and is of different type", i->path);
1574 return 0;
1575 }
1576 }
1577
1578 fd = openat(dfd, bn, O_NOFOLLOW|O_CLOEXEC|O_PATH);
1579 if (fd < 0)
1580 return log_error_errno(errno, "Failed to openat(%s): %m", i->path);
1581
1582 return fd_set_perms(i, fd, i->path, NULL);
1583 }
1584
1585 typedef enum {
1586 CREATION_NORMAL,
1587 CREATION_EXISTING,
1588 CREATION_FORCE,
1589 _CREATION_MODE_MAX,
1590 _CREATION_MODE_INVALID = -1
1591 } CreationMode;
1592
1593 static const char *const creation_mode_verb_table[_CREATION_MODE_MAX] = {
1594 [CREATION_NORMAL] = "Created",
1595 [CREATION_EXISTING] = "Found existing",
1596 [CREATION_FORCE] = "Created replacement",
1597 };
1598
1599 DEFINE_PRIVATE_STRING_TABLE_LOOKUP_TO_STRING(creation_mode_verb, CreationMode);
1600
1601 static int create_directory_or_subvolume(const char *path, mode_t mode, bool subvol, CreationMode *creation) {
1602 _cleanup_close_ int pfd = -1;
1603 CreationMode c;
1604 int r;
1605
1606 assert(path);
1607
1608 if (!creation)
1609 creation = &c;
1610
1611 pfd = path_open_parent_safe(path);
1612 if (pfd < 0)
1613 return pfd;
1614
1615 if (subvol) {
1616 if (btrfs_is_subvol(empty_to_root(arg_root)) <= 0)
1617
1618 /* Don't create a subvolume unless the root directory is
1619 * one, too. We do this under the assumption that if the
1620 * root directory is just a plain directory (i.e. very
1621 * light-weight), we shouldn't try to split it up into
1622 * subvolumes (i.e. more heavy-weight). Thus, chroot()
1623 * environments and suchlike will get a full brtfs
1624 * subvolume set up below their tree only if they
1625 * specifically set up a btrfs subvolume for the root
1626 * dir too. */
1627
1628 subvol = false;
1629 else {
1630 RUN_WITH_UMASK((~mode) & 0777)
1631 r = btrfs_subvol_make_fd(pfd, basename(path));
1632 }
1633 } else
1634 r = 0;
1635
1636 if (!subvol || r == -ENOTTY)
1637 RUN_WITH_UMASK(0000)
1638 r = mkdirat_label(pfd, basename(path), mode);
1639
1640 if (r < 0) {
1641 int k;
1642
1643 if (!IN_SET(r, -EEXIST, -EROFS))
1644 return log_error_errno(r, "Failed to create directory or subvolume \"%s\": %m", path);
1645
1646 k = is_dir_fd(pfd);
1647 if (k == -ENOENT && r == -EROFS)
1648 return log_error_errno(r, "%s does not exist and cannot be created as the file system is read-only.", path);
1649 if (k < 0)
1650 return log_error_errno(k, "Failed to check if %s exists: %m", path);
1651 if (!k) {
1652 log_warning("\"%s\" already exists and is not a directory.", path);
1653 return -EEXIST;
1654 }
1655
1656 *creation = CREATION_EXISTING;
1657 } else
1658 *creation = CREATION_NORMAL;
1659
1660 log_debug("%s directory \"%s\".", creation_mode_verb_to_string(*creation), path);
1661
1662 r = openat(pfd, basename(path), O_NOCTTY|O_CLOEXEC|O_DIRECTORY);
1663 if (r < 0)
1664 return log_error_errno(errno, "Failed to open directory '%s': %m", basename(path));
1665
1666 return r;
1667 }
1668
1669 static int create_directory(Item *i, const char *path) {
1670 _cleanup_close_ int fd = -1;
1671
1672 assert(i);
1673 assert(IN_SET(i->type, CREATE_DIRECTORY, TRUNCATE_DIRECTORY));
1674
1675 fd = create_directory_or_subvolume(path, i->mode, false, NULL);
1676 if (fd == -EEXIST)
1677 return 0;
1678 if (fd < 0)
1679 return fd;
1680
1681 return fd_set_perms(i, fd, path, NULL);
1682 }
1683
1684 static int create_subvolume(Item *i, const char *path) {
1685 _cleanup_close_ int fd = -1;
1686 CreationMode creation;
1687 int r, q = 0;
1688
1689 assert(i);
1690 assert(IN_SET(i->type, CREATE_SUBVOLUME, CREATE_SUBVOLUME_NEW_QUOTA, CREATE_SUBVOLUME_INHERIT_QUOTA));
1691
1692 fd = create_directory_or_subvolume(path, i->mode, true, &creation);
1693 if (fd == -EEXIST)
1694 return 0;
1695 if (fd < 0)
1696 return fd;
1697
1698 if (creation == CREATION_NORMAL &&
1699 IN_SET(i->type, CREATE_SUBVOLUME_NEW_QUOTA, CREATE_SUBVOLUME_INHERIT_QUOTA)) {
1700 r = btrfs_subvol_auto_qgroup_fd(fd, 0, i->type == CREATE_SUBVOLUME_NEW_QUOTA);
1701 if (r == -ENOTTY)
1702 log_debug_errno(r, "Couldn't adjust quota for subvolume \"%s\" (unsupported fs or dir not a subvolume): %m", i->path);
1703 else if (r == -EROFS)
1704 log_debug_errno(r, "Couldn't adjust quota for subvolume \"%s\" (fs is read-only).", i->path);
1705 else if (r == -ENOTCONN)
1706 log_debug_errno(r, "Couldn't adjust quota for subvolume \"%s\" (quota support is disabled).", i->path);
1707 else if (r < 0)
1708 q = log_error_errno(r, "Failed to adjust quota for subvolume \"%s\": %m", i->path);
1709 else if (r > 0)
1710 log_debug("Adjusted quota for subvolume \"%s\".", i->path);
1711 else if (r == 0)
1712 log_debug("Quota for subvolume \"%s\" already in place, no change made.", i->path);
1713 }
1714
1715 r = fd_set_perms(i, fd, path, NULL);
1716 if (q < 0) /* prefer the quota change error from above */
1717 return q;
1718
1719 return r;
1720 }
1721
1722 static int empty_directory(Item *i, const char *path) {
1723 int r;
1724
1725 assert(i);
1726 assert(i->type == EMPTY_DIRECTORY);
1727
1728 r = is_dir(path, false);
1729 if (r == -ENOENT) {
1730 /* Option "e" operates only on existing objects. Do not
1731 * print errors about non-existent files or directories */
1732 log_debug("Skipping missing directory: %s", path);
1733 return 0;
1734 }
1735 if (r < 0)
1736 return log_error_errno(r, "is_dir() failed on path %s: %m", path);
1737 if (r == 0)
1738 return log_error_errno(SYNTHETIC_ERRNO(EEXIST),
1739 "'%s' already exists and is not a directory.",
1740 path);
1741
1742 return path_set_perms(i, path);
1743 }
1744
1745 static int create_device(Item *i, mode_t file_type) {
1746 _cleanup_close_ int dfd = -1, fd = -1;
1747 CreationMode creation;
1748 char *bn;
1749 int r;
1750
1751 assert(i);
1752 assert(IN_SET(file_type, S_IFBLK, S_IFCHR));
1753
1754 bn = basename(i->path);
1755
1756 /* Validate the path and use the returned directory fd for copying the
1757 * target so we're sure that the path can't be changed behind our
1758 * back. */
1759 dfd = path_open_parent_safe(i->path);
1760 if (dfd < 0)
1761 return dfd;
1762
1763 RUN_WITH_UMASK(0000) {
1764 mac_selinux_create_file_prepare(i->path, file_type);
1765 r = mknodat(dfd, bn, i->mode | file_type, i->major_minor);
1766 mac_selinux_create_file_clear();
1767 }
1768
1769 if (r < 0) {
1770 struct stat st;
1771
1772 if (errno == EPERM) {
1773 log_debug("We lack permissions, possibly because of cgroup configuration; "
1774 "skipping creation of device node %s.", i->path);
1775 return 0;
1776 }
1777
1778 if (errno != EEXIST)
1779 return log_error_errno(errno, "Failed to create device node %s: %m", i->path);
1780
1781 if (fstatat(dfd, bn, &st, 0) < 0)
1782 return log_error_errno(errno, "stat(%s) failed: %m", i->path);
1783
1784 if ((st.st_mode & S_IFMT) != file_type) {
1785
1786 if (i->append_or_force) {
1787
1788 RUN_WITH_UMASK(0000) {
1789 mac_selinux_create_file_prepare(i->path, file_type);
1790 /* FIXME: need to introduce mknodat_atomic() */
1791 r = mknod_atomic(i->path, i->mode | file_type, i->major_minor);
1792 mac_selinux_create_file_clear();
1793 }
1794
1795 if (r < 0)
1796 return log_error_errno(r, "Failed to create device node \"%s\": %m", i->path);
1797 creation = CREATION_FORCE;
1798 } else {
1799 log_debug("%s is not a device node.", i->path);
1800 return 0;
1801 }
1802 } else
1803 creation = CREATION_EXISTING;
1804 } else
1805 creation = CREATION_NORMAL;
1806
1807 log_debug("%s %s device node \"%s\" %u:%u.",
1808 creation_mode_verb_to_string(creation),
1809 i->type == CREATE_BLOCK_DEVICE ? "block" : "char",
1810 i->path, major(i->mode), minor(i->mode));
1811
1812 fd = openat(dfd, bn, O_NOFOLLOW|O_CLOEXEC|O_PATH);
1813 if (fd < 0)
1814 return log_error_errno(errno, "Failed to openat(%s): %m", i->path);
1815
1816 return fd_set_perms(i, fd, i->path, NULL);
1817 }
1818
1819 static int create_fifo(Item *i, const char *path) {
1820 _cleanup_close_ int pfd = -1, fd = -1;
1821 CreationMode creation;
1822 struct stat st;
1823 char *bn;
1824 int r;
1825
1826 pfd = path_open_parent_safe(path);
1827 if (pfd < 0)
1828 return pfd;
1829
1830 bn = basename(path);
1831
1832 RUN_WITH_UMASK(0000) {
1833 mac_selinux_create_file_prepare(path, S_IFIFO);
1834 r = mkfifoat(pfd, bn, i->mode);
1835 mac_selinux_create_file_clear();
1836 }
1837
1838 if (r < 0) {
1839 if (errno != EEXIST)
1840 return log_error_errno(errno, "Failed to create fifo %s: %m", path);
1841
1842 if (fstatat(pfd, bn, &st, AT_SYMLINK_NOFOLLOW) < 0)
1843 return log_error_errno(errno, "stat(%s) failed: %m", path);
1844
1845 if (!S_ISFIFO(st.st_mode)) {
1846
1847 if (i->append_or_force) {
1848 RUN_WITH_UMASK(0000) {
1849 mac_selinux_create_file_prepare(path, S_IFIFO);
1850 r = mkfifoat_atomic(pfd, bn, i->mode);
1851 mac_selinux_create_file_clear();
1852 }
1853
1854 if (r < 0)
1855 return log_error_errno(r, "Failed to create fifo %s: %m", path);
1856 creation = CREATION_FORCE;
1857 } else {
1858 log_warning("\"%s\" already exists and is not a fifo.", path);
1859 return 0;
1860 }
1861 } else
1862 creation = CREATION_EXISTING;
1863 } else
1864 creation = CREATION_NORMAL;
1865
1866 log_debug("%s fifo \"%s\".", creation_mode_verb_to_string(creation), path);
1867
1868 fd = openat(pfd, bn, O_NOFOLLOW|O_CLOEXEC|O_PATH);
1869 if (fd < 0)
1870 return log_error_errno(errno, "Failed to openat(%s): %m", path);
1871
1872 return fd_set_perms(i, fd, i->path, NULL);
1873 }
1874
1875 typedef int (*action_t)(Item *i, const char *path);
1876 typedef int (*fdaction_t)(Item *i, int fd, const char *path, const struct stat *st);
1877
1878 static int item_do(Item *i, int fd, const char *path, fdaction_t action) {
1879 struct stat st;
1880 int r = 0, q;
1881
1882 assert(i);
1883 assert(path);
1884 assert(fd >= 0);
1885
1886 if (fstat(fd, &st) < 0) {
1887 r = log_error_errno(errno, "fstat() on file failed: %m");
1888 goto finish;
1889 }
1890
1891 /* This returns the first error we run into, but nevertheless
1892 * tries to go on */
1893 r = action(i, fd, path, &st);
1894
1895 if (S_ISDIR(st.st_mode)) {
1896 char procfs_path[STRLEN("/proc/self/fd/") + DECIMAL_STR_MAX(int)];
1897 _cleanup_closedir_ DIR *d = NULL;
1898 struct dirent *de;
1899
1900 /* The passed 'fd' was opened with O_PATH. We need to convert
1901 * it into a 'regular' fd before reading the directory content. */
1902 xsprintf(procfs_path, "/proc/self/fd/%i", fd);
1903
1904 d = opendir(procfs_path);
1905 if (!d) {
1906 log_error_errno(errno, "Failed to opendir() '%s': %m", procfs_path);
1907 if (r == 0)
1908 r = -errno;
1909 goto finish;
1910 }
1911
1912 FOREACH_DIRENT_ALL(de, d, q = -errno; goto finish) {
1913 int de_fd;
1914
1915 if (dot_or_dot_dot(de->d_name))
1916 continue;
1917
1918 de_fd = openat(fd, de->d_name, O_NOFOLLOW|O_CLOEXEC|O_PATH);
1919 if (de_fd < 0)
1920 q = log_error_errno(errno, "Failed to open() file '%s': %m", de->d_name);
1921 else {
1922 _cleanup_free_ char *de_path = NULL;
1923
1924 de_path = path_join(path, de->d_name);
1925 if (!de_path)
1926 q = log_oom();
1927 else
1928 /* Pass ownership of dirent fd over */
1929 q = item_do(i, de_fd, de_path, action);
1930 }
1931
1932 if (q < 0 && r == 0)
1933 r = q;
1934 }
1935 }
1936 finish:
1937 safe_close(fd);
1938 return r;
1939 }
1940
1941 static int glob_item(Item *i, action_t action) {
1942 _cleanup_globfree_ glob_t g = {
1943 .gl_opendir = (void *(*)(const char *)) opendir_nomod,
1944 };
1945 int r = 0, k;
1946 char **fn;
1947
1948 k = safe_glob(i->path, GLOB_NOSORT|GLOB_BRACE, &g);
1949 if (k < 0 && k != -ENOENT)
1950 return log_error_errno(k, "glob(%s) failed: %m", i->path);
1951
1952 STRV_FOREACH(fn, g.gl_pathv) {
1953 k = action(i, *fn);
1954 if (k < 0 && r == 0)
1955 r = k;
1956 }
1957
1958 return r;
1959 }
1960
1961 static int glob_item_recursively(Item *i, fdaction_t action) {
1962 _cleanup_globfree_ glob_t g = {
1963 .gl_opendir = (void *(*)(const char *)) opendir_nomod,
1964 };
1965 int r = 0, k;
1966 char **fn;
1967
1968 k = safe_glob(i->path, GLOB_NOSORT|GLOB_BRACE, &g);
1969 if (k < 0 && k != -ENOENT)
1970 return log_error_errno(k, "glob(%s) failed: %m", i->path);
1971
1972 STRV_FOREACH(fn, g.gl_pathv) {
1973 _cleanup_close_ int fd = -1;
1974
1975 /* Make sure we won't trigger/follow file object (such as
1976 * device nodes, automounts, ...) pointed out by 'fn' with
1977 * O_PATH. Note, when O_PATH is used, flags other than
1978 * O_CLOEXEC, O_DIRECTORY, and O_NOFOLLOW are ignored. */
1979
1980 fd = open(*fn, O_CLOEXEC|O_NOFOLLOW|O_PATH);
1981 if (fd < 0) {
1982 log_error_errno(errno, "Opening '%s' failed: %m", *fn);
1983 if (r == 0)
1984 r = -errno;
1985 continue;
1986 }
1987
1988 k = item_do(i, fd, *fn, action);
1989 if (k < 0 && r == 0)
1990 r = k;
1991
1992 /* we passed fd ownership to the previous call */
1993 fd = -1;
1994 }
1995
1996 return r;
1997 }
1998
1999 static int create_item(Item *i) {
2000 CreationMode creation;
2001 int r = 0;
2002
2003 assert(i);
2004
2005 log_debug("Running create action for entry %c %s", (char) i->type, i->path);
2006
2007 switch (i->type) {
2008
2009 case IGNORE_PATH:
2010 case IGNORE_DIRECTORY_PATH:
2011 case REMOVE_PATH:
2012 case RECURSIVE_REMOVE_PATH:
2013 return 0;
2014
2015 case TRUNCATE_FILE:
2016 case CREATE_FILE:
2017 RUN_WITH_UMASK(0000)
2018 (void) mkdir_parents_label(i->path, 0755);
2019
2020 if ((i->type == CREATE_FILE && i->append_or_force) || i->type == TRUNCATE_FILE)
2021 r = truncate_file(i, i->path);
2022 else
2023 r = create_file(i, i->path);
2024
2025 if (r < 0)
2026 return r;
2027 break;
2028
2029 case COPY_FILES:
2030 RUN_WITH_UMASK(0000)
2031 (void) mkdir_parents_label(i->path, 0755);
2032
2033 r = copy_files(i);
2034 if (r < 0)
2035 return r;
2036 break;
2037
2038 case WRITE_FILE:
2039 r = glob_item(i, write_one_file);
2040 if (r < 0)
2041 return r;
2042
2043 break;
2044
2045 case CREATE_DIRECTORY:
2046 case TRUNCATE_DIRECTORY:
2047 RUN_WITH_UMASK(0000)
2048 (void) mkdir_parents_label(i->path, 0755);
2049
2050 r = create_directory(i, i->path);
2051 if (r < 0)
2052 return r;
2053 break;
2054
2055 case CREATE_SUBVOLUME:
2056 case CREATE_SUBVOLUME_INHERIT_QUOTA:
2057 case CREATE_SUBVOLUME_NEW_QUOTA:
2058 RUN_WITH_UMASK(0000)
2059 (void) mkdir_parents_label(i->path, 0755);
2060
2061 r = create_subvolume(i, i->path);
2062 if (r < 0)
2063 return r;
2064 break;
2065
2066 case EMPTY_DIRECTORY:
2067 r = glob_item(i, empty_directory);
2068 if (r < 0)
2069 return r;
2070 break;
2071
2072 case CREATE_FIFO:
2073 RUN_WITH_UMASK(0000)
2074 (void) mkdir_parents_label(i->path, 0755);
2075
2076 r = create_fifo(i, i->path);
2077 if (r < 0)
2078 return r;
2079 break;
2080
2081 case CREATE_SYMLINK: {
2082 RUN_WITH_UMASK(0000)
2083 (void) mkdir_parents_label(i->path, 0755);
2084
2085 mac_selinux_create_file_prepare(i->path, S_IFLNK);
2086 r = symlink(i->argument, i->path);
2087 mac_selinux_create_file_clear();
2088
2089 if (r < 0) {
2090 _cleanup_free_ char *x = NULL;
2091
2092 if (errno != EEXIST)
2093 return log_error_errno(errno, "symlink(%s, %s) failed: %m", i->argument, i->path);
2094
2095 r = readlink_malloc(i->path, &x);
2096 if (r < 0 || !streq(i->argument, x)) {
2097
2098 if (i->append_or_force) {
2099 mac_selinux_create_file_prepare(i->path, S_IFLNK);
2100 r = symlink_atomic(i->argument, i->path);
2101 mac_selinux_create_file_clear();
2102
2103 if (IN_SET(r, -EISDIR, -EEXIST, -ENOTEMPTY)) {
2104 r = rm_rf(i->path, REMOVE_ROOT|REMOVE_PHYSICAL);
2105 if (r < 0)
2106 return log_error_errno(r, "rm -fr %s failed: %m", i->path);
2107
2108 mac_selinux_create_file_prepare(i->path, S_IFLNK);
2109 r = symlink(i->argument, i->path) < 0 ? -errno : 0;
2110 mac_selinux_create_file_clear();
2111 }
2112 if (r < 0)
2113 return log_error_errno(r, "symlink(%s, %s) failed: %m", i->argument, i->path);
2114
2115 creation = CREATION_FORCE;
2116 } else {
2117 log_debug("\"%s\" is not a symlink or does not point to the correct path.", i->path);
2118 return 0;
2119 }
2120 } else
2121 creation = CREATION_EXISTING;
2122 } else
2123
2124 creation = CREATION_NORMAL;
2125 log_debug("%s symlink \"%s\".", creation_mode_verb_to_string(creation), i->path);
2126 break;
2127 }
2128
2129 case CREATE_BLOCK_DEVICE:
2130 case CREATE_CHAR_DEVICE:
2131 if (have_effective_cap(CAP_MKNOD) == 0) {
2132 /* In a container we lack CAP_MKNOD. We shouldn't attempt to create the device node in that
2133 * case to avoid noise, and we don't support virtualized devices in containers anyway. */
2134
2135 log_debug("We lack CAP_MKNOD, skipping creation of device node %s.", i->path);
2136 return 0;
2137 }
2138
2139 RUN_WITH_UMASK(0000)
2140 (void) mkdir_parents_label(i->path, 0755);
2141
2142 r = create_device(i, i->type == CREATE_BLOCK_DEVICE ? S_IFBLK : S_IFCHR);
2143 if (r < 0)
2144 return r;
2145
2146 break;
2147
2148 case ADJUST_MODE:
2149 case RELABEL_PATH:
2150 r = glob_item(i, path_set_perms);
2151 if (r < 0)
2152 return r;
2153 break;
2154
2155 case RECURSIVE_RELABEL_PATH:
2156 r = glob_item_recursively(i, fd_set_perms);
2157 if (r < 0)
2158 return r;
2159 break;
2160
2161 case SET_XATTR:
2162 r = glob_item(i, path_set_xattrs);
2163 if (r < 0)
2164 return r;
2165 break;
2166
2167 case RECURSIVE_SET_XATTR:
2168 r = glob_item_recursively(i, fd_set_xattrs);
2169 if (r < 0)
2170 return r;
2171 break;
2172
2173 case SET_ACL:
2174 r = glob_item(i, path_set_acls);
2175 if (r < 0)
2176 return r;
2177 break;
2178
2179 case RECURSIVE_SET_ACL:
2180 r = glob_item_recursively(i, fd_set_acls);
2181 if (r < 0)
2182 return r;
2183 break;
2184
2185 case SET_ATTRIBUTE:
2186 r = glob_item(i, path_set_attribute);
2187 if (r < 0)
2188 return r;
2189 break;
2190
2191 case RECURSIVE_SET_ATTRIBUTE:
2192 r = glob_item_recursively(i, fd_set_attribute);
2193 if (r < 0)
2194 return r;
2195 break;
2196 }
2197
2198 return 0;
2199 }
2200
2201 static int remove_item_instance(Item *i, const char *instance) {
2202 int r;
2203
2204 assert(i);
2205
2206 switch (i->type) {
2207
2208 case REMOVE_PATH:
2209 if (remove(instance) < 0 && errno != ENOENT)
2210 return log_error_errno(errno, "rm(%s): %m", instance);
2211
2212 break;
2213
2214 case RECURSIVE_REMOVE_PATH:
2215 /* FIXME: we probably should use dir_cleanup() here instead of rm_rf() so that 'x' is honoured. */
2216 log_debug("rm -rf \"%s\"", instance);
2217 r = rm_rf(instance, REMOVE_ROOT|REMOVE_SUBVOLUME|REMOVE_PHYSICAL);
2218 if (r < 0 && r != -ENOENT)
2219 return log_error_errno(r, "rm_rf(%s): %m", instance);
2220
2221 break;
2222
2223 default:
2224 assert_not_reached("wut?");
2225 }
2226
2227 return 0;
2228 }
2229
2230 static int remove_item(Item *i) {
2231 int r;
2232
2233 assert(i);
2234
2235 log_debug("Running remove action for entry %c %s", (char) i->type, i->path);
2236
2237 switch (i->type) {
2238
2239 case TRUNCATE_DIRECTORY:
2240 /* FIXME: we probably should use dir_cleanup() here instead of rm_rf() so that 'x' is honoured. */
2241 log_debug("rm -rf \"%s\"", i->path);
2242 r = rm_rf(i->path, REMOVE_PHYSICAL);
2243 if (r < 0 && r != -ENOENT)
2244 return log_error_errno(r, "rm_rf(%s): %m", i->path);
2245
2246 return 0;
2247
2248 case REMOVE_PATH:
2249 case RECURSIVE_REMOVE_PATH:
2250 return glob_item(i, remove_item_instance);
2251
2252 default:
2253 return 0;
2254 }
2255 }
2256
2257 static int clean_item_instance(Item *i, const char* instance) {
2258 char timestamp[FORMAT_TIMESTAMP_MAX];
2259 _cleanup_closedir_ DIR *d = NULL;
2260 STRUCT_STATX_DEFINE(sx);
2261 int mountpoint, r;
2262 usec_t cutoff, n;
2263
2264 assert(i);
2265
2266 if (!i->age_set)
2267 return 0;
2268
2269 n = now(CLOCK_REALTIME);
2270 if (n < i->age)
2271 return 0;
2272
2273 cutoff = n - i->age;
2274
2275 d = opendir_nomod(instance);
2276 if (!d) {
2277 if (IN_SET(errno, ENOENT, ENOTDIR)) {
2278 log_debug_errno(errno, "Directory \"%s\": %m", instance);
2279 return 0;
2280 }
2281
2282 return log_error_errno(errno, "Failed to open directory %s: %m", instance);
2283 }
2284
2285 r = statx_fallback(dirfd(d), "", AT_EMPTY_PATH, STATX_MODE|STATX_INO|STATX_ATIME|STATX_MTIME, &sx);
2286 if (r < 0)
2287 return log_error_errno(r, "statx(%s) failed: %m", instance);
2288
2289 if (FLAGS_SET(sx.stx_attributes_mask, STATX_ATTR_MOUNT_ROOT))
2290 mountpoint = FLAGS_SET(sx.stx_attributes, STATX_ATTR_MOUNT_ROOT);
2291 else {
2292 struct stat ps;
2293
2294 if (fstatat(dirfd(d), "..", &ps, AT_SYMLINK_NOFOLLOW) != 0)
2295 return log_error_errno(errno, "stat(%s/..) failed: %m", i->path);
2296
2297 mountpoint =
2298 sx.stx_dev_major != major(ps.st_dev) ||
2299 sx.stx_dev_minor != minor(ps.st_dev) ||
2300 sx.stx_ino != ps.st_ino;
2301 }
2302
2303 log_debug("Cleanup threshold for %s \"%s\" is %s",
2304 mountpoint ? "mount point" : "directory",
2305 instance,
2306 format_timestamp_style(timestamp, sizeof(timestamp), cutoff, TIMESTAMP_US));
2307
2308 return dir_cleanup(i, instance, d,
2309 load_statx_timestamp_nsec(&sx.stx_atime),
2310 load_statx_timestamp_nsec(&sx.stx_mtime),
2311 cutoff * NSEC_PER_USEC,
2312 sx.stx_dev_major, sx.stx_dev_minor, mountpoint,
2313 MAX_DEPTH, i->keep_first_level);
2314 }
2315
2316 static int clean_item(Item *i) {
2317 assert(i);
2318
2319 log_debug("Running clean action for entry %c %s", (char) i->type, i->path);
2320
2321 switch (i->type) {
2322 case CREATE_DIRECTORY:
2323 case CREATE_SUBVOLUME:
2324 case CREATE_SUBVOLUME_INHERIT_QUOTA:
2325 case CREATE_SUBVOLUME_NEW_QUOTA:
2326 case TRUNCATE_DIRECTORY:
2327 case IGNORE_PATH:
2328 case COPY_FILES:
2329 clean_item_instance(i, i->path);
2330 return 0;
2331 case EMPTY_DIRECTORY:
2332 case IGNORE_DIRECTORY_PATH:
2333 return glob_item(i, clean_item_instance);
2334 default:
2335 return 0;
2336 }
2337 }
2338
2339 static int process_item(Item *i, OperationMask operation) {
2340 OperationMask todo;
2341 int r, q, p;
2342
2343 assert(i);
2344
2345 todo = operation & ~i->done;
2346 if (todo == 0) /* Everything already done? */
2347 return 0;
2348
2349 i->done |= operation;
2350
2351 r = chase_symlinks(i->path, arg_root, CHASE_NO_AUTOFS|CHASE_WARN, NULL, NULL);
2352 if (r == -EREMOTE) {
2353 log_notice_errno(r, "Skipping %s", i->path);
2354 return 0;
2355 }
2356 if (r < 0)
2357 log_debug_errno(r, "Failed to determine whether '%s' is below autofs, ignoring: %m", i->path);
2358
2359 r = FLAGS_SET(operation, OPERATION_CREATE) ? create_item(i) : 0;
2360 /* Failure can only be tolerated for create */
2361 if (i->allow_failure)
2362 r = 0;
2363
2364 q = FLAGS_SET(operation, OPERATION_REMOVE) ? remove_item(i) : 0;
2365 p = FLAGS_SET(operation, OPERATION_CLEAN) ? clean_item(i) : 0;
2366
2367 return r < 0 ? r :
2368 q < 0 ? q :
2369 p;
2370 }
2371
2372 static int process_item_array(ItemArray *array, OperationMask operation) {
2373 int r = 0;
2374 size_t n;
2375
2376 assert(array);
2377
2378 /* Create any parent first. */
2379 if (FLAGS_SET(operation, OPERATION_CREATE) && array->parent)
2380 r = process_item_array(array->parent, operation & OPERATION_CREATE);
2381
2382 /* Clean up all children first */
2383 if ((operation & (OPERATION_REMOVE|OPERATION_CLEAN)) && !set_isempty(array->children)) {
2384 ItemArray *c;
2385
2386 SET_FOREACH(c, array->children) {
2387 int k;
2388
2389 k = process_item_array(c, operation & (OPERATION_REMOVE|OPERATION_CLEAN));
2390 if (k < 0 && r == 0)
2391 r = k;
2392 }
2393 }
2394
2395 for (n = 0; n < array->n_items; n++) {
2396 int k;
2397
2398 k = process_item(array->items + n, operation);
2399 if (k < 0 && r == 0)
2400 r = k;
2401 }
2402
2403 return r;
2404 }
2405
2406 static void item_free_contents(Item *i) {
2407 assert(i);
2408 free(i->path);
2409 free(i->argument);
2410 strv_free(i->xattrs);
2411
2412 #if HAVE_ACL
2413 acl_free(i->acl_access);
2414 acl_free(i->acl_default);
2415 #endif
2416 }
2417
2418 static ItemArray* item_array_free(ItemArray *a) {
2419 size_t n;
2420
2421 if (!a)
2422 return NULL;
2423
2424 for (n = 0; n < a->n_items; n++)
2425 item_free_contents(a->items + n);
2426
2427 set_free(a->children);
2428 free(a->items);
2429 return mfree(a);
2430 }
2431
2432 static int item_compare(const Item *a, const Item *b) {
2433 /* Make sure that the ownership taking item is put first, so
2434 * that we first create the node, and then can adjust it */
2435
2436 if (takes_ownership(a->type) && !takes_ownership(b->type))
2437 return -1;
2438 if (!takes_ownership(a->type) && takes_ownership(b->type))
2439 return 1;
2440
2441 return CMP(a->type, b->type);
2442 }
2443
2444 static bool item_compatible(Item *a, Item *b) {
2445 assert(a);
2446 assert(b);
2447 assert(streq(a->path, b->path));
2448
2449 if (takes_ownership(a->type) && takes_ownership(b->type))
2450 /* check if the items are the same */
2451 return streq_ptr(a->argument, b->argument) &&
2452
2453 a->uid_set == b->uid_set &&
2454 a->uid == b->uid &&
2455
2456 a->gid_set == b->gid_set &&
2457 a->gid == b->gid &&
2458
2459 a->mode_set == b->mode_set &&
2460 a->mode == b->mode &&
2461
2462 a->age_set == b->age_set &&
2463 a->age == b->age &&
2464
2465 a->mask_perms == b->mask_perms &&
2466
2467 a->keep_first_level == b->keep_first_level &&
2468
2469 a->major_minor == b->major_minor;
2470
2471 return true;
2472 }
2473
2474 static bool should_include_path(const char *path) {
2475 char **prefix;
2476
2477 STRV_FOREACH(prefix, arg_exclude_prefixes)
2478 if (path_startswith(path, *prefix)) {
2479 log_debug("Entry \"%s\" matches exclude prefix \"%s\", skipping.",
2480 path, *prefix);
2481 return false;
2482 }
2483
2484 STRV_FOREACH(prefix, arg_include_prefixes)
2485 if (path_startswith(path, *prefix)) {
2486 log_debug("Entry \"%s\" matches include prefix \"%s\".", path, *prefix);
2487 return true;
2488 }
2489
2490 /* no matches, so we should include this path only if we have no allow list at all */
2491 if (strv_isempty(arg_include_prefixes))
2492 return true;
2493
2494 log_debug("Entry \"%s\" does not match any include prefix, skipping.", path);
2495 return false;
2496 }
2497
2498 static int specifier_expansion_from_arg(Item *i) {
2499 _cleanup_free_ char *unescaped = NULL, *resolved = NULL;
2500 char **xattr;
2501 int r;
2502
2503 assert(i);
2504
2505 if (!i->argument)
2506 return 0;
2507
2508 switch (i->type) {
2509 case COPY_FILES:
2510 case CREATE_SYMLINK:
2511 case CREATE_FILE:
2512 case TRUNCATE_FILE:
2513 case WRITE_FILE:
2514 r = cunescape(i->argument, 0, &unescaped);
2515 if (r < 0)
2516 return log_error_errno(r, "Failed to unescape parameter to write: %s", i->argument);
2517
2518 r = specifier_printf(unescaped, specifier_table, NULL, &resolved);
2519 if (r < 0)
2520 return r;
2521
2522 free_and_replace(i->argument, resolved);
2523 break;
2524
2525 case SET_XATTR:
2526 case RECURSIVE_SET_XATTR:
2527 STRV_FOREACH(xattr, i->xattrs) {
2528 r = specifier_printf(*xattr, specifier_table, NULL, &resolved);
2529 if (r < 0)
2530 return r;
2531
2532 free_and_replace(*xattr, resolved);
2533 }
2534 break;
2535
2536 default:
2537 break;
2538 }
2539 return 0;
2540 }
2541
2542 static int patch_var_run(const char *fname, unsigned line, char **path) {
2543 const char *k;
2544 char *n;
2545
2546 assert(path);
2547 assert(*path);
2548
2549 /* Optionally rewrites lines referencing /var/run/, to use /run/ instead. Why bother? tmpfiles merges lines in
2550 * some cases and detects conflicts in others. If files/directories are specified through two equivalent lines
2551 * this is problematic as neither case will be detected. Ideally we'd detect these cases by resolving symlinks
2552 * early, but that's precisely not what we can do here as this code very likely is running very early on, at a
2553 * time where the paths in question are not available yet, or even more importantly, our own tmpfiles rules
2554 * might create the paths that are intermediary to the listed paths. We can't really cover the generic case,
2555 * but the least we can do is cover the specific case of /var/run vs. /run, as /var/run is a legacy name for
2556 * /run only, and we explicitly document that and require that on systemd systems the former is a symlink to
2557 * the latter. Moreover files below this path are by far the primary usecase for tmpfiles.d/. */
2558
2559 k = path_startswith(*path, "/var/run/");
2560 if (isempty(k)) /* Don't complain about other paths than /var/run, and not about /var/run itself either. */
2561 return 0;
2562
2563 n = path_join("/run", k);
2564 if (!n)
2565 return log_oom();
2566
2567 /* Also log about this briefly. We do so at LOG_NOTICE level, as we fixed up the situation automatically, hence
2568 * there's no immediate need for action by the user. However, in the interest of making things less confusing
2569 * to the user, let's still inform the user that these snippets should really be updated. */
2570 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);
2571
2572 free_and_replace(*path, n);
2573
2574 return 0;
2575 }
2576
2577 static int find_uid(const char *user, uid_t *ret_uid, Hashmap **cache) {
2578 int r;
2579
2580 assert(user);
2581 assert(ret_uid);
2582
2583 /* First: parse as numeric UID string */
2584 r = parse_uid(user, ret_uid);
2585 if (r >= 0)
2586 return r;
2587
2588 /* Second: pass to NSS if we are running "online" */
2589 if (!arg_root)
2590 return get_user_creds(&user, ret_uid, NULL, NULL, NULL, 0);
2591
2592 /* Third, synthesize "root" unconditionally */
2593 if (streq(user, "root")) {
2594 *ret_uid = 0;
2595 return 0;
2596 }
2597
2598 /* Fourth: use fgetpwent() to read /etc/passwd directly, if we are "offline" */
2599 return name_to_uid_offline(arg_root, user, ret_uid, cache);
2600 }
2601
2602 static int find_gid(const char *group, gid_t *ret_gid, Hashmap **cache) {
2603 int r;
2604
2605 assert(group);
2606 assert(ret_gid);
2607
2608 /* First: parse as numeric GID string */
2609 r = parse_gid(group, ret_gid);
2610 if (r >= 0)
2611 return r;
2612
2613 /* Second: pass to NSS if we are running "online" */
2614 if (!arg_root)
2615 return get_group_creds(&group, ret_gid, 0);
2616
2617 /* Third, synthesize "root" unconditionally */
2618 if (streq(group, "root")) {
2619 *ret_gid = 0;
2620 return 0;
2621 }
2622
2623 /* Fourth: use fgetgrent() to read /etc/group directly, if we are "offline" */
2624 return name_to_gid_offline(arg_root, group, ret_gid, cache);
2625 }
2626
2627 static int parse_line(
2628 const char *fname,
2629 unsigned line,
2630 const char *buffer,
2631 bool *invalid_config,
2632 Hashmap **uid_cache,
2633 Hashmap **gid_cache) {
2634
2635 _cleanup_free_ char *action = NULL, *mode = NULL, *user = NULL, *group = NULL, *age = NULL, *path = NULL;
2636 _cleanup_(item_free_contents) Item i = {};
2637 ItemArray *existing;
2638 OrderedHashmap *h;
2639 int r, pos;
2640 bool append_or_force = false, boot = false, allow_failure = false;
2641
2642 assert(fname);
2643 assert(line >= 1);
2644 assert(buffer);
2645
2646 r = extract_many_words(
2647 &buffer,
2648 NULL,
2649 EXTRACT_UNQUOTE,
2650 &action,
2651 &path,
2652 &mode,
2653 &user,
2654 &group,
2655 &age,
2656 NULL);
2657 if (r < 0) {
2658 if (IN_SET(r, -EINVAL, -EBADSLT))
2659 /* invalid quoting and such or an unknown specifier */
2660 *invalid_config = true;
2661 return log_syntax(NULL, LOG_ERR, fname, line, r, "Failed to parse line: %m");
2662 } else if (r < 2) {
2663 *invalid_config = true;
2664 return log_syntax(NULL, LOG_ERR, fname, line, SYNTHETIC_ERRNO(EBADMSG), "Syntax error.");
2665 }
2666
2667 if (!empty_or_dash(buffer)) {
2668 i.argument = strdup(buffer);
2669 if (!i.argument)
2670 return log_oom();
2671 }
2672
2673 if (isempty(action)) {
2674 *invalid_config = true;
2675 return log_syntax(NULL, LOG_ERR, fname, line, SYNTHETIC_ERRNO(EBADMSG), "Command too short '%s'.", action);
2676 }
2677
2678 for (pos = 1; action[pos]; pos++) {
2679 if (action[pos] == '!' && !boot)
2680 boot = true;
2681 else if (action[pos] == '+' && !append_or_force)
2682 append_or_force = true;
2683 else if (action[pos] == '-' && !allow_failure)
2684 allow_failure = true;
2685 else {
2686 *invalid_config = true;
2687 return log_syntax(NULL, LOG_ERR, fname, line, SYNTHETIC_ERRNO(EBADMSG), "Unknown modifiers in command '%s'", action);
2688 }
2689 }
2690
2691 if (boot && !arg_boot) {
2692 log_syntax(NULL, LOG_DEBUG, fname, line, 0, "Ignoring entry %s \"%s\" because --boot is not specified.", action, path);
2693 return 0;
2694 }
2695
2696 i.type = action[0];
2697 i.append_or_force = append_or_force;
2698 i.allow_failure = allow_failure;
2699
2700 r = specifier_printf(path, specifier_table, NULL, &i.path);
2701 if (r == -ENXIO)
2702 return log_unresolvable_specifier(fname, line);
2703 if (r < 0) {
2704 if (IN_SET(r, -EINVAL, -EBADSLT))
2705 *invalid_config = true;
2706 return log_syntax(NULL, LOG_ERR, fname, line, r, "Failed to replace specifiers in '%s': %m", path);
2707 }
2708
2709 r = patch_var_run(fname, line, &i.path);
2710 if (r < 0)
2711 return r;
2712
2713 switch (i.type) {
2714
2715 case CREATE_DIRECTORY:
2716 case CREATE_SUBVOLUME:
2717 case CREATE_SUBVOLUME_INHERIT_QUOTA:
2718 case CREATE_SUBVOLUME_NEW_QUOTA:
2719 case EMPTY_DIRECTORY:
2720 case TRUNCATE_DIRECTORY:
2721 case CREATE_FIFO:
2722 case IGNORE_PATH:
2723 case IGNORE_DIRECTORY_PATH:
2724 case REMOVE_PATH:
2725 case RECURSIVE_REMOVE_PATH:
2726 case ADJUST_MODE:
2727 case RELABEL_PATH:
2728 case RECURSIVE_RELABEL_PATH:
2729 if (i.argument)
2730 log_syntax(NULL, LOG_WARNING, fname, line, 0, "%c lines don't take argument fields, ignoring.", i.type);
2731
2732 break;
2733
2734 case CREATE_FILE:
2735 case TRUNCATE_FILE:
2736 break;
2737
2738 case CREATE_SYMLINK:
2739 if (!i.argument) {
2740 i.argument = path_join("/usr/share/factory", i.path);
2741 if (!i.argument)
2742 return log_oom();
2743 }
2744 break;
2745
2746 case WRITE_FILE:
2747 if (!i.argument) {
2748 *invalid_config = true;
2749 return log_syntax(NULL, LOG_ERR, fname, line, SYNTHETIC_ERRNO(EBADMSG), "Write file requires argument.");
2750 }
2751 break;
2752
2753 case COPY_FILES:
2754 if (!i.argument) {
2755 i.argument = path_join("/usr/share/factory", i.path);
2756 if (!i.argument)
2757 return log_oom();
2758
2759 } else if (!path_is_absolute(i.argument)) {
2760 *invalid_config = true;
2761 return log_syntax(NULL, LOG_ERR, fname, line, SYNTHETIC_ERRNO(EBADMSG), "Source path '%s' is not absolute.", i.argument);
2762
2763 }
2764
2765 if (!empty_or_root(arg_root)) {
2766 char *p;
2767
2768 p = path_join(arg_root, i.argument);
2769 if (!p)
2770 return log_oom();
2771 free_and_replace(i.argument, p);
2772 }
2773
2774 path_simplify(i.argument, false);
2775 break;
2776
2777 case CREATE_CHAR_DEVICE:
2778 case CREATE_BLOCK_DEVICE:
2779 if (!i.argument) {
2780 *invalid_config = true;
2781 return log_syntax(NULL, LOG_ERR, fname, line, SYNTHETIC_ERRNO(EBADMSG), "Device file requires argument.");
2782 }
2783
2784 r = parse_dev(i.argument, &i.major_minor);
2785 if (r < 0) {
2786 *invalid_config = true;
2787 return log_syntax(NULL, LOG_ERR, fname, line, r, "Can't parse device file major/minor '%s'.", i.argument);
2788 }
2789
2790 break;
2791
2792 case SET_XATTR:
2793 case RECURSIVE_SET_XATTR:
2794 if (!i.argument) {
2795 *invalid_config = true;
2796 return log_syntax(NULL, LOG_ERR, fname, line, SYNTHETIC_ERRNO(EBADMSG),
2797 "Set extended attribute requires argument.");
2798 }
2799 r = parse_xattrs_from_arg(&i);
2800 if (r < 0)
2801 return r;
2802 break;
2803
2804 case SET_ACL:
2805 case RECURSIVE_SET_ACL:
2806 if (!i.argument) {
2807 *invalid_config = true;
2808 return log_syntax(NULL, LOG_ERR, fname, line, SYNTHETIC_ERRNO(EBADMSG),
2809 "Set ACLs requires argument.");
2810 }
2811 r = parse_acls_from_arg(&i);
2812 if (r < 0)
2813 return r;
2814 break;
2815
2816 case SET_ATTRIBUTE:
2817 case RECURSIVE_SET_ATTRIBUTE:
2818 if (!i.argument) {
2819 *invalid_config = true;
2820 return log_syntax(NULL, LOG_ERR, fname, line, SYNTHETIC_ERRNO(EBADMSG),
2821 "Set file attribute requires argument.");
2822 }
2823 r = parse_attribute_from_arg(&i);
2824 if (IN_SET(r, -EINVAL, -EBADSLT))
2825 *invalid_config = true;
2826 if (r < 0)
2827 return r;
2828 break;
2829
2830 default:
2831 *invalid_config = true;
2832 return log_syntax(NULL, LOG_ERR, fname, line, SYNTHETIC_ERRNO(EBADMSG),
2833 "Unknown command type '%c'.", (char) i.type);
2834 }
2835
2836 if (!path_is_absolute(i.path)) {
2837 *invalid_config = true;
2838 return log_syntax(NULL, LOG_ERR, fname, line, SYNTHETIC_ERRNO(EBADMSG),
2839 "Path '%s' not absolute.", i.path);
2840 }
2841
2842 path_simplify(i.path, false);
2843
2844 if (!should_include_path(i.path))
2845 return 0;
2846
2847 r = specifier_expansion_from_arg(&i);
2848 if (r == -ENXIO)
2849 return log_unresolvable_specifier(fname, line);
2850 if (r < 0) {
2851 if (IN_SET(r, -EINVAL, -EBADSLT))
2852 *invalid_config = true;
2853 return log_syntax(NULL, LOG_ERR, fname, line, r, "Failed to substitute specifiers in argument: %m");
2854 }
2855
2856 if (!empty_or_root(arg_root)) {
2857 char *p;
2858
2859 p = path_join(arg_root, i.path);
2860 if (!p)
2861 return log_oom();
2862 free_and_replace(i.path, p);
2863 }
2864
2865 if (!empty_or_dash(user)) {
2866 r = find_uid(user, &i.uid, uid_cache);
2867 if (r < 0) {
2868 *invalid_config = true;
2869 return log_syntax(NULL, LOG_ERR, fname, line, r, "Failed to resolve user '%s': %m", user);
2870 }
2871
2872 i.uid_set = true;
2873 }
2874
2875 if (!empty_or_dash(group)) {
2876 r = find_gid(group, &i.gid, gid_cache);
2877 if (r < 0) {
2878 *invalid_config = true;
2879 return log_syntax(NULL, LOG_ERR, fname, line, r, "Failed to resolve group '%s'.", group);
2880 }
2881
2882 i.gid_set = true;
2883 }
2884
2885 if (!empty_or_dash(mode)) {
2886 const char *mm = mode;
2887 unsigned m;
2888
2889 if (*mm == '~') {
2890 i.mask_perms = true;
2891 mm++;
2892 }
2893
2894 r = parse_mode(mm, &m);
2895 if (r < 0) {
2896 *invalid_config = true;
2897 return log_syntax(NULL, LOG_ERR, fname, line, r, "Invalid mode '%s'.", mode);
2898 }
2899
2900 i.mode = m;
2901 i.mode_set = true;
2902 } else
2903 i.mode = IN_SET(i.type, CREATE_DIRECTORY, TRUNCATE_DIRECTORY, CREATE_SUBVOLUME, CREATE_SUBVOLUME_INHERIT_QUOTA, CREATE_SUBVOLUME_NEW_QUOTA) ? 0755 : 0644;
2904
2905 if (!empty_or_dash(age)) {
2906 const char *a = age;
2907
2908 if (*a == '~') {
2909 i.keep_first_level = true;
2910 a++;
2911 }
2912
2913 r = parse_sec(a, &i.age);
2914 if (r < 0) {
2915 *invalid_config = true;
2916 return log_syntax(NULL, LOG_ERR, fname, line, r, "Invalid age '%s'.", age);
2917 }
2918
2919 i.age_set = true;
2920 }
2921
2922 h = needs_glob(i.type) ? globs : items;
2923
2924 existing = ordered_hashmap_get(h, i.path);
2925 if (existing) {
2926 size_t n;
2927
2928 for (n = 0; n < existing->n_items; n++) {
2929 if (!item_compatible(existing->items + n, &i) && !i.append_or_force) {
2930 log_syntax(NULL, LOG_NOTICE, fname, line, 0, "Duplicate line for path \"%s\", ignoring.", i.path);
2931 return 0;
2932 }
2933 }
2934 } else {
2935 existing = new0(ItemArray, 1);
2936 if (!existing)
2937 return log_oom();
2938
2939 r = ordered_hashmap_put(h, i.path, existing);
2940 if (r < 0) {
2941 free(existing);
2942 return log_oom();
2943 }
2944 }
2945
2946 if (!GREEDY_REALLOC(existing->items, existing->allocated, existing->n_items + 1))
2947 return log_oom();
2948
2949 existing->items[existing->n_items++] = i;
2950 i = (struct Item) {};
2951
2952 /* Sort item array, to enforce stable ordering of application */
2953 typesafe_qsort(existing->items, existing->n_items, item_compare);
2954
2955 return 0;
2956 }
2957
2958 static int cat_config(char **config_dirs, char **args) {
2959 _cleanup_strv_free_ char **files = NULL;
2960 int r;
2961
2962 r = conf_files_list_with_replacement(arg_root, config_dirs, arg_replace, &files, NULL);
2963 if (r < 0)
2964 return r;
2965
2966 return cat_files(NULL, files, 0);
2967 }
2968
2969 static int exclude_default_prefixes(void) {
2970 int r;
2971
2972 /* Provide an easy way to exclude virtual/memory file systems from what we do here. Useful in
2973 * combination with --root= where we probably don't want to apply stuff to these dirs as they are
2974 * likely over-mounted if the root directory is actually used, and it wouldbe less than ideal to have
2975 * all kinds of files created/adjusted underneath these mount points. */
2976
2977 r = strv_extend_strv(
2978 &arg_exclude_prefixes,
2979 STRV_MAKE("/dev",
2980 "/proc",
2981 "/run",
2982 "/sys"),
2983 true);
2984 if (r < 0)
2985 return log_oom();
2986
2987 return 0;
2988 }
2989
2990 static int help(void) {
2991 _cleanup_free_ char *link = NULL;
2992 int r;
2993
2994 r = terminal_urlify_man("systemd-tmpfiles", "8", &link);
2995 if (r < 0)
2996 return log_oom();
2997
2998 printf("%s [OPTIONS...] [CONFIGURATION FILE...]\n\n"
2999 "Creates, deletes and cleans up volatile and temporary files and directories.\n\n"
3000 " -h --help Show this help\n"
3001 " --user Execute user configuration\n"
3002 " --version Show package version\n"
3003 " --cat-config Show configuration files\n"
3004 " --create Create marked files/directories\n"
3005 " --clean Clean up marked directories\n"
3006 " --remove Remove marked files/directories\n"
3007 " --boot Execute actions only safe at boot\n"
3008 " --prefix=PATH Only apply rules with the specified prefix\n"
3009 " --exclude-prefix=PATH Ignore rules with the specified prefix\n"
3010 " -E Ignore rules prefixed with /dev, /proc, /run, /sys\n"
3011 " --root=PATH Operate on an alternate filesystem root\n"
3012 " --image=PATH Operate on disk image as filesystem root\n"
3013 " --replace=PATH Treat arguments as replacement for PATH\n"
3014 " --no-pager Do not pipe output into a pager\n"
3015 "\nSee the %s for details.\n"
3016 , program_invocation_short_name
3017 , link
3018 );
3019
3020 return 0;
3021 }
3022
3023 static int parse_argv(int argc, char *argv[]) {
3024
3025 enum {
3026 ARG_VERSION = 0x100,
3027 ARG_CAT_CONFIG,
3028 ARG_USER,
3029 ARG_CREATE,
3030 ARG_CLEAN,
3031 ARG_REMOVE,
3032 ARG_BOOT,
3033 ARG_PREFIX,
3034 ARG_EXCLUDE_PREFIX,
3035 ARG_ROOT,
3036 ARG_IMAGE,
3037 ARG_REPLACE,
3038 ARG_NO_PAGER,
3039 };
3040
3041 static const struct option options[] = {
3042 { "help", no_argument, NULL, 'h' },
3043 { "user", no_argument, NULL, ARG_USER },
3044 { "version", no_argument, NULL, ARG_VERSION },
3045 { "cat-config", no_argument, NULL, ARG_CAT_CONFIG },
3046 { "create", no_argument, NULL, ARG_CREATE },
3047 { "clean", no_argument, NULL, ARG_CLEAN },
3048 { "remove", no_argument, NULL, ARG_REMOVE },
3049 { "boot", no_argument, NULL, ARG_BOOT },
3050 { "prefix", required_argument, NULL, ARG_PREFIX },
3051 { "exclude-prefix", required_argument, NULL, ARG_EXCLUDE_PREFIX },
3052 { "root", required_argument, NULL, ARG_ROOT },
3053 { "image", required_argument, NULL, ARG_IMAGE },
3054 { "replace", required_argument, NULL, ARG_REPLACE },
3055 { "no-pager", no_argument, NULL, ARG_NO_PAGER },
3056 {}
3057 };
3058
3059 int c, r;
3060
3061 assert(argc >= 0);
3062 assert(argv);
3063
3064 while ((c = getopt_long(argc, argv, "hE", options, NULL)) >= 0)
3065
3066 switch (c) {
3067
3068 case 'h':
3069 return help();
3070
3071 case ARG_VERSION:
3072 return version();
3073
3074 case ARG_CAT_CONFIG:
3075 arg_cat_config = true;
3076 break;
3077
3078 case ARG_USER:
3079 arg_user = true;
3080 break;
3081
3082 case ARG_CREATE:
3083 arg_operation |= OPERATION_CREATE;
3084 break;
3085
3086 case ARG_CLEAN:
3087 arg_operation |= OPERATION_CLEAN;
3088 break;
3089
3090 case ARG_REMOVE:
3091 arg_operation |= OPERATION_REMOVE;
3092 break;
3093
3094 case ARG_BOOT:
3095 arg_boot = true;
3096 break;
3097
3098 case ARG_PREFIX:
3099 if (strv_push(&arg_include_prefixes, optarg) < 0)
3100 return log_oom();
3101 break;
3102
3103 case ARG_EXCLUDE_PREFIX:
3104 if (strv_push(&arg_exclude_prefixes, optarg) < 0)
3105 return log_oom();
3106 break;
3107
3108 case ARG_ROOT:
3109 r = parse_path_argument_and_warn(optarg, /* suppress_root= */ false, &arg_root);
3110 if (r < 0)
3111 return r;
3112 break;
3113
3114 case ARG_IMAGE:
3115 #ifdef STANDALONE
3116 return log_error_errno(SYNTHETIC_ERRNO(EOPNOTSUPP),
3117 "This systemd-tmpfiles version is compiled without support for --image=.");
3118 #else
3119 r = parse_path_argument_and_warn(optarg, /* suppress_root= */ false, &arg_image);
3120 if (r < 0)
3121 return r;
3122 #endif
3123 /* Imply -E here since it makes little sense to create files persistently in the /run mountpoint of a disk image */
3124 _fallthrough_;
3125
3126 case 'E':
3127 r = exclude_default_prefixes();
3128 if (r < 0)
3129 return r;
3130
3131 break;
3132
3133 case ARG_REPLACE:
3134 if (!path_is_absolute(optarg) ||
3135 !endswith(optarg, ".conf"))
3136 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
3137 "The argument to --replace= must an absolute path to a config file");
3138
3139 arg_replace = optarg;
3140 break;
3141
3142 case ARG_NO_PAGER:
3143 arg_pager_flags |= PAGER_DISABLE;
3144 break;
3145
3146 case '?':
3147 return -EINVAL;
3148
3149 default:
3150 assert_not_reached("Unhandled option");
3151 }
3152
3153 if (arg_operation == 0 && !arg_cat_config)
3154 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
3155 "You need to specify at least one of --clean, --create or --remove.");
3156
3157 if (arg_replace && arg_cat_config)
3158 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
3159 "Option --replace= is not supported with --cat-config");
3160
3161 if (arg_replace && optind >= argc)
3162 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
3163 "When --replace= is given, some configuration items must be specified");
3164
3165 if (arg_root && arg_user)
3166 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
3167 "Combination of --user and --root= is not supported.");
3168
3169 if (arg_image && arg_root)
3170 return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "Please specify either --root= or --image=, the combination of both is not supported.");
3171
3172 return 1;
3173 }
3174
3175 static int read_config_file(char **config_dirs, const char *fn, bool ignore_enoent, bool *invalid_config) {
3176 _cleanup_(hashmap_freep) Hashmap *uid_cache = NULL, *gid_cache = NULL;
3177 _cleanup_fclose_ FILE *_f = NULL;
3178 unsigned v = 0;
3179 FILE *f;
3180 Item *i;
3181 int r = 0;
3182
3183 assert(fn);
3184
3185 if (streq(fn, "-")) {
3186 log_debug("Reading config from stdin…");
3187 fn = "<stdin>";
3188 f = stdin;
3189 } else {
3190 r = search_and_fopen(fn, "re", arg_root, (const char**) config_dirs, &_f);
3191 if (r < 0) {
3192 if (ignore_enoent && r == -ENOENT) {
3193 log_debug_errno(r, "Failed to open \"%s\", ignoring: %m", fn);
3194 return 0;
3195 }
3196
3197 return log_error_errno(r, "Failed to open '%s': %m", fn);
3198 }
3199 log_debug("Reading config file \"%s\"…", fn);
3200 f = _f;
3201 }
3202
3203 for (;;) {
3204 _cleanup_free_ char *line = NULL;
3205 bool invalid_line = false;
3206 char *l;
3207 int k;
3208
3209 k = read_line(f, LONG_LINE_MAX, &line);
3210 if (k < 0)
3211 return log_error_errno(k, "Failed to read '%s': %m", fn);
3212 if (k == 0)
3213 break;
3214
3215 v++;
3216
3217 l = strstrip(line);
3218 if (IN_SET(*l, 0, '#'))
3219 continue;
3220
3221 k = parse_line(fn, v, l, &invalid_line, &uid_cache, &gid_cache);
3222 if (k < 0) {
3223 if (invalid_line)
3224 /* Allow reporting with a special code if the caller requested this */
3225 *invalid_config = true;
3226 else if (r == 0)
3227 /* The first error becomes our return value */
3228 r = k;
3229 }
3230 }
3231
3232 /* we have to determine age parameter for each entry of type X */
3233 ORDERED_HASHMAP_FOREACH(i, globs) {
3234 Item *j, *candidate_item = NULL;
3235
3236 if (i->type != IGNORE_DIRECTORY_PATH)
3237 continue;
3238
3239 ORDERED_HASHMAP_FOREACH(j, items) {
3240 if (!IN_SET(j->type, CREATE_DIRECTORY, TRUNCATE_DIRECTORY, CREATE_SUBVOLUME, CREATE_SUBVOLUME_INHERIT_QUOTA, CREATE_SUBVOLUME_NEW_QUOTA))
3241 continue;
3242
3243 if (path_equal(j->path, i->path)) {
3244 candidate_item = j;
3245 break;
3246 }
3247
3248 if ((!candidate_item && path_startswith(i->path, j->path)) ||
3249 (candidate_item && path_startswith(j->path, candidate_item->path) && (fnmatch(i->path, j->path, FNM_PATHNAME | FNM_PERIOD) == 0)))
3250 candidate_item = j;
3251 }
3252
3253 if (candidate_item && candidate_item->age_set) {
3254 i->age = candidate_item->age;
3255 i->age_set = true;
3256 }
3257 }
3258
3259 if (ferror(f)) {
3260 log_error_errno(errno, "Failed to read from file %s: %m", fn);
3261 if (r == 0)
3262 r = -EIO;
3263 }
3264
3265 return r;
3266 }
3267
3268 static int parse_arguments(char **config_dirs, char **args, bool *invalid_config) {
3269 char **arg;
3270 int r;
3271
3272 STRV_FOREACH(arg, args) {
3273 r = read_config_file(config_dirs, *arg, false, invalid_config);
3274 if (r < 0)
3275 return r;
3276 }
3277
3278 return 0;
3279 }
3280
3281 static int read_config_files(char **config_dirs, char **args, bool *invalid_config) {
3282 _cleanup_strv_free_ char **files = NULL;
3283 _cleanup_free_ char *p = NULL;
3284 char **f;
3285 int r;
3286
3287 r = conf_files_list_with_replacement(arg_root, config_dirs, arg_replace, &files, &p);
3288 if (r < 0)
3289 return r;
3290
3291 STRV_FOREACH(f, files)
3292 if (p && path_equal(*f, p)) {
3293 log_debug("Parsing arguments at position \"%s\"…", *f);
3294
3295 r = parse_arguments(config_dirs, args, invalid_config);
3296 if (r < 0)
3297 return r;
3298 } else
3299 /* Just warn, ignore result otherwise.
3300 * read_config_file() has some debug output, so no need to print anything. */
3301 (void) read_config_file(config_dirs, *f, true, invalid_config);
3302
3303 return 0;
3304 }
3305
3306 static int link_parent(ItemArray *a) {
3307 const char *path;
3308 char *prefix;
3309 int r;
3310
3311 assert(a);
3312
3313 /* Finds the closest "parent" item array for the specified item array. Then registers the specified item array
3314 * as child of it, and fills the parent in, linking them both ways. This allows us to later create parents
3315 * before their children, and clean up/remove children before their parents. */
3316
3317 if (a->n_items <= 0)
3318 return 0;
3319
3320 path = a->items[0].path;
3321 prefix = newa(char, strlen(path) + 1);
3322 PATH_FOREACH_PREFIX(prefix, path) {
3323 ItemArray *j;
3324
3325 j = ordered_hashmap_get(items, prefix);
3326 if (!j)
3327 j = ordered_hashmap_get(globs, prefix);
3328 if (j) {
3329 r = set_ensure_put(&j->children, NULL, a);
3330 if (r < 0)
3331 return log_oom();
3332
3333 a->parent = j;
3334 return 1;
3335 }
3336 }
3337
3338 return 0;
3339 }
3340
3341 DEFINE_PRIVATE_HASH_OPS_WITH_VALUE_DESTRUCTOR(item_array_hash_ops, char, string_hash_func, string_compare_func,
3342 ItemArray, item_array_free);
3343
3344 static int run(int argc, char *argv[]) {
3345 #ifndef STANDALONE
3346 _cleanup_(loop_device_unrefp) LoopDevice *loop_device = NULL;
3347 _cleanup_(decrypted_image_unrefp) DecryptedImage *decrypted_image = NULL;
3348 _cleanup_(umount_and_rmdir_and_freep) char *unlink_dir = NULL;
3349 #endif
3350 _cleanup_strv_free_ char **config_dirs = NULL;
3351 bool invalid_config = false;
3352 ItemArray *a;
3353 enum {
3354 PHASE_REMOVE_AND_CLEAN,
3355 PHASE_CREATE,
3356 _PHASE_MAX
3357 } phase;
3358 int r, k;
3359
3360 r = parse_argv(argc, argv);
3361 if (r <= 0)
3362 return r;
3363
3364 log_setup_service();
3365
3366 /* Descending down file system trees might take a lot of fds */
3367 (void) rlimit_nofile_bump(HIGH_RLIMIT_NOFILE);
3368
3369 if (arg_user) {
3370 r = user_config_paths(&config_dirs);
3371 if (r < 0)
3372 return log_error_errno(r, "Failed to initialize configuration directory list: %m");
3373 } else {
3374 config_dirs = strv_split_nulstr(CONF_PATHS_NULSTR("tmpfiles.d"));
3375 if (!config_dirs)
3376 return log_oom();
3377 }
3378
3379 if (DEBUG_LOGGING) {
3380 _cleanup_free_ char *t = NULL;
3381 char **i;
3382
3383 STRV_FOREACH(i, config_dirs) {
3384 _cleanup_free_ char *j = NULL;
3385
3386 j = path_join(arg_root, *i);
3387 if (!j)
3388 return log_oom();
3389
3390 if (!strextend(&t, "\n\t", j))
3391 return log_oom();
3392 }
3393
3394 log_debug("Looking for configuration files in (higher priority first):%s", t);
3395 }
3396
3397 if (arg_cat_config) {
3398 (void) pager_open(arg_pager_flags);
3399
3400 return cat_config(config_dirs, argv + optind);
3401 }
3402
3403 umask(0022);
3404
3405 r = mac_selinux_init();
3406 if (r < 0)
3407 return r;
3408
3409 #ifndef STANDALONE
3410 if (arg_image) {
3411 assert(!arg_root);
3412
3413 r = mount_image_privately_interactively(
3414 arg_image,
3415 DISSECT_IMAGE_REQUIRE_ROOT|DISSECT_IMAGE_VALIDATE_OS|DISSECT_IMAGE_RELAX_VAR_CHECK|DISSECT_IMAGE_FSCK,
3416 &unlink_dir,
3417 &loop_device,
3418 &decrypted_image);
3419 if (r < 0)
3420 return r;
3421
3422 arg_root = strdup(unlink_dir);
3423 if (!arg_root)
3424 return log_oom();
3425 }
3426 #else
3427 assert(!arg_image);
3428 #endif
3429
3430 items = ordered_hashmap_new(&item_array_hash_ops);
3431 globs = ordered_hashmap_new(&item_array_hash_ops);
3432 if (!items || !globs)
3433 return log_oom();
3434
3435 /* If command line arguments are specified along with --replace, read all
3436 * configuration files and insert the positional arguments at the specified
3437 * place. Otherwise, if command line arguments are specified, execute just
3438 * them, and finally, without --replace= or any positional arguments, just
3439 * read configuration and execute it.
3440 */
3441 if (arg_replace || optind >= argc)
3442 r = read_config_files(config_dirs, argv + optind, &invalid_config);
3443 else
3444 r = parse_arguments(config_dirs, argv + optind, &invalid_config);
3445 if (r < 0)
3446 return r;
3447
3448 /* Let's now link up all child/parent relationships */
3449 ORDERED_HASHMAP_FOREACH(a, items) {
3450 r = link_parent(a);
3451 if (r < 0)
3452 return r;
3453 }
3454 ORDERED_HASHMAP_FOREACH(a, globs) {
3455 r = link_parent(a);
3456 if (r < 0)
3457 return r;
3458 }
3459
3460 /* If multiple operations are requested, let's first run the remove/clean operations, and only then the create
3461 * operations. i.e. that we first clean out the platform we then build on. */
3462 for (phase = 0; phase < _PHASE_MAX; phase++) {
3463 OperationMask op;
3464
3465 if (phase == PHASE_REMOVE_AND_CLEAN)
3466 op = arg_operation & (OPERATION_REMOVE|OPERATION_CLEAN);
3467 else if (phase == PHASE_CREATE)
3468 op = arg_operation & OPERATION_CREATE;
3469 else
3470 assert_not_reached("unexpected phase");
3471
3472 if (op == 0) /* Nothing requested in this phase */
3473 continue;
3474
3475 /* The non-globbing ones usually create things, hence we apply them first */
3476 ORDERED_HASHMAP_FOREACH(a, items) {
3477 k = process_item_array(a, op);
3478 if (k < 0 && r >= 0)
3479 r = k;
3480 }
3481
3482 /* The globbing ones usually alter things, hence we apply them second. */
3483 ORDERED_HASHMAP_FOREACH(a, globs) {
3484 k = process_item_array(a, op);
3485 if (k < 0 && r >= 0)
3486 r = k;
3487 }
3488 }
3489
3490 if (ERRNO_IS_RESOURCE(r))
3491 return r;
3492 if (invalid_config)
3493 return EX_DATAERR;
3494 if (r < 0)
3495 return EX_CANTCREAT;
3496 return 0;
3497 }
3498
3499 DEFINE_MAIN_FUNCTION_WITH_POSITIVE_FAILURE(run);
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