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Merge pull request #16979 from keszybz/return-log-debug
[thirdparty/systemd.git] / src / tmpfiles / tmpfiles.c
1 /* SPDX-License-Identifier: LGPL-2.1+ */
2
3 #include <errno.h>
4 #include <fcntl.h>
5 #include <fnmatch.h>
6 #include <getopt.h>
7 #include <limits.h>
8 #include <linux/fs.h>
9 #include <stdbool.h>
10 #include <stddef.h>
11 #include <stdlib.h>
12 #include <sys/file.h>
13 #include <sys/xattr.h>
14 #include <sysexits.h>
15 #include <time.h>
16 #include <unistd.h>
17
18 #include "sd-path.h"
19
20 #include "acl-util.h"
21 #include "alloc-util.h"
22 #include "btrfs-util.h"
23 #include "capability-util.h"
24 #include "chattr-util.h"
25 #include "conf-files.h"
26 #include "copy.h"
27 #include "def.h"
28 #include "dirent-util.h"
29 #include "dissect-image.h"
30 #include "escape.h"
31 #include "fd-util.h"
32 #include "fileio.h"
33 #include "format-util.h"
34 #include "fs-util.h"
35 #include "glob-util.h"
36 #include "io-util.h"
37 #include "label.h"
38 #include "log.h"
39 #include "macro.h"
40 #include "main-func.h"
41 #include "missing_stat.h"
42 #include "missing_syscall.h"
43 #include "mkdir.h"
44 #include "mount-util.h"
45 #include "mountpoint-util.h"
46 #include "offline-passwd.h"
47 #include "pager.h"
48 #include "parse-util.h"
49 #include "path-lookup.h"
50 #include "path-util.h"
51 #include "pretty-print.h"
52 #include "rlimit-util.h"
53 #include "rm-rf.h"
54 #include "selinux-util.h"
55 #include "set.h"
56 #include "sort-util.h"
57 #include "specifier.h"
58 #include "stat-util.h"
59 #include "stdio-util.h"
60 #include "string-table.h"
61 #include "string-util.h"
62 #include "strv.h"
63 #include "umask-util.h"
64 #include "user-util.h"
65
66 /* This reads all files listed in /etc/tmpfiles.d/?*.conf and creates
67 * them in the file system. This is intended to be used to create
68 * properly owned directories beneath /tmp, /var/tmp, /run, which are
69 * volatile and hence need to be recreated on bootup. */
70
71 typedef enum OperationMask {
72 OPERATION_CREATE = 1 << 0,
73 OPERATION_REMOVE = 1 << 1,
74 OPERATION_CLEAN = 1 << 2,
75 } OperationMask;
76
77 typedef enum ItemType {
78 /* These ones take file names */
79 CREATE_FILE = 'f',
80 TRUNCATE_FILE = 'F', /* deprecated: use f+ */
81 CREATE_DIRECTORY = 'd',
82 TRUNCATE_DIRECTORY = 'D',
83 CREATE_SUBVOLUME = 'v',
84 CREATE_SUBVOLUME_INHERIT_QUOTA = 'q',
85 CREATE_SUBVOLUME_NEW_QUOTA = 'Q',
86 CREATE_FIFO = 'p',
87 CREATE_SYMLINK = 'L',
88 CREATE_CHAR_DEVICE = 'c',
89 CREATE_BLOCK_DEVICE = 'b',
90 COPY_FILES = 'C',
91
92 /* These ones take globs */
93 WRITE_FILE = 'w',
94 EMPTY_DIRECTORY = 'e',
95 SET_XATTR = 't',
96 RECURSIVE_SET_XATTR = 'T',
97 SET_ACL = 'a',
98 RECURSIVE_SET_ACL = 'A',
99 SET_ATTRIBUTE = 'h',
100 RECURSIVE_SET_ATTRIBUTE = 'H',
101 IGNORE_PATH = 'x',
102 IGNORE_DIRECTORY_PATH = 'X',
103 REMOVE_PATH = 'r',
104 RECURSIVE_REMOVE_PATH = 'R',
105 RELABEL_PATH = 'z',
106 RECURSIVE_RELABEL_PATH = 'Z',
107 ADJUST_MODE = 'm', /* legacy, 'z' is identical to this */
108 } ItemType;
109
110 typedef struct Item {
111 ItemType type;
112
113 char *path;
114 char *argument;
115 char **xattrs;
116 #if HAVE_ACL
117 acl_t acl_access;
118 acl_t acl_default;
119 #endif
120 uid_t uid;
121 gid_t gid;
122 mode_t mode;
123 usec_t age;
124
125 dev_t major_minor;
126 unsigned attribute_value;
127 unsigned attribute_mask;
128
129 bool uid_set:1;
130 bool gid_set:1;
131 bool mode_set:1;
132 bool age_set:1;
133 bool mask_perms:1;
134 bool attribute_set:1;
135
136 bool keep_first_level:1;
137
138 bool append_or_force:1;
139
140 bool allow_failure:1;
141
142 OperationMask done;
143 } Item;
144
145 typedef struct ItemArray {
146 Item *items;
147 size_t n_items;
148 size_t allocated;
149
150 struct ItemArray *parent;
151 Set *children;
152 } ItemArray;
153
154 typedef enum DirectoryType {
155 DIRECTORY_RUNTIME,
156 DIRECTORY_STATE,
157 DIRECTORY_CACHE,
158 DIRECTORY_LOGS,
159 _DIRECTORY_TYPE_MAX,
160 } DirectoryType;
161
162 static bool arg_cat_config = false;
163 static bool arg_user = false;
164 static OperationMask arg_operation = 0;
165 static bool arg_boot = false;
166 static PagerFlags arg_pager_flags = 0;
167
168 static char **arg_include_prefixes = NULL;
169 static char **arg_exclude_prefixes = NULL;
170 static char *arg_root = NULL;
171 static char *arg_image = NULL;
172 static char *arg_replace = NULL;
173
174 #define MAX_DEPTH 256
175
176 static OrderedHashmap *items = NULL, *globs = NULL;
177 static Set *unix_sockets = NULL;
178
179 STATIC_DESTRUCTOR_REGISTER(items, ordered_hashmap_freep);
180 STATIC_DESTRUCTOR_REGISTER(globs, ordered_hashmap_freep);
181 STATIC_DESTRUCTOR_REGISTER(unix_sockets, set_free_freep);
182 STATIC_DESTRUCTOR_REGISTER(arg_include_prefixes, freep);
183 STATIC_DESTRUCTOR_REGISTER(arg_exclude_prefixes, freep);
184 STATIC_DESTRUCTOR_REGISTER(arg_root, freep);
185 STATIC_DESTRUCTOR_REGISTER(arg_image, freep);
186
187 static int specifier_machine_id_safe(char specifier, const void *data, const void *userdata, char **ret);
188 static int specifier_directory(char specifier, const void *data, const void *userdata, char **ret);
189
190 static const Specifier specifier_table[] = {
191 { 'm', specifier_machine_id_safe, NULL },
192 { 'b', specifier_boot_id, NULL },
193 { 'H', specifier_host_name, NULL },
194 { 'l', specifier_short_host_name, NULL },
195 { 'v', specifier_kernel_release, NULL },
196 { 'a', specifier_architecture, NULL },
197 { 'o', specifier_os_id, NULL },
198 { 'w', specifier_os_version_id, NULL },
199 { 'B', specifier_os_build_id, NULL },
200 { 'W', specifier_os_variant_id, NULL },
201
202 { 'g', specifier_group_name, NULL },
203 { 'G', specifier_group_id, NULL },
204 { 'U', specifier_user_id, NULL },
205 { 'u', specifier_user_name, NULL },
206 { 'h', specifier_user_home, NULL },
207
208 { 't', specifier_directory, UINT_TO_PTR(DIRECTORY_RUNTIME) },
209 { 'S', specifier_directory, UINT_TO_PTR(DIRECTORY_STATE) },
210 { 'C', specifier_directory, UINT_TO_PTR(DIRECTORY_CACHE) },
211 { 'L', specifier_directory, UINT_TO_PTR(DIRECTORY_LOGS) },
212 { 'T', specifier_tmp_dir, NULL },
213 { 'V', specifier_var_tmp_dir, NULL },
214 {}
215 };
216
217 static int specifier_machine_id_safe(char specifier, const void *data, const void *userdata, char **ret) {
218 int r;
219
220 /* If /etc/machine_id is missing or empty (e.g. in a chroot environment)
221 * return a recognizable error so that the caller can skip the rule
222 * gracefully. */
223
224 r = specifier_machine_id(specifier, data, userdata, ret);
225 if (IN_SET(r, -ENOENT, -ENOMEDIUM))
226 return -ENXIO;
227
228 return r;
229 }
230
231 static int specifier_directory(char specifier, const void *data, const void *userdata, char **ret) {
232 struct table_entry {
233 uint64_t type;
234 const char *suffix;
235 };
236
237 static const struct table_entry paths_system[] = {
238 [DIRECTORY_RUNTIME] = { SD_PATH_SYSTEM_RUNTIME },
239 [DIRECTORY_STATE] = { SD_PATH_SYSTEM_STATE_PRIVATE },
240 [DIRECTORY_CACHE] = { SD_PATH_SYSTEM_STATE_CACHE },
241 [DIRECTORY_LOGS] = { SD_PATH_SYSTEM_STATE_LOGS },
242 };
243
244 static const struct table_entry paths_user[] = {
245 [DIRECTORY_RUNTIME] = { SD_PATH_USER_RUNTIME },
246 [DIRECTORY_STATE] = { SD_PATH_USER_CONFIGURATION },
247 [DIRECTORY_CACHE] = { SD_PATH_USER_STATE_CACHE },
248 [DIRECTORY_LOGS] = { SD_PATH_USER_CONFIGURATION, "log" },
249 };
250
251 unsigned i;
252 const struct table_entry *paths;
253
254 assert_cc(ELEMENTSOF(paths_system) == ELEMENTSOF(paths_user));
255 paths = arg_user ? paths_user : paths_system;
256
257 i = PTR_TO_UINT(data);
258 assert(i < ELEMENTSOF(paths_system));
259
260 return sd_path_lookup(paths[i].type, paths[i].suffix, ret);
261 }
262
263 static int log_unresolvable_specifier(const char *filename, unsigned line) {
264 static bool notified = false;
265
266 /* In system mode, this is called when /etc is not fully initialized (e.g.
267 * in a chroot environment) where some specifiers are unresolvable. In user
268 * mode, this is called when some variables are not defined. These cases are
269 * not considered as an error so log at LOG_NOTICE only for the first time
270 * and then downgrade this to LOG_DEBUG for the rest. */
271
272 log_syntax(NULL,
273 notified ? LOG_DEBUG : LOG_NOTICE,
274 filename, line, 0,
275 "Failed to resolve specifier: %s, skipping",
276 arg_user ? "Required $XDG_... variable not defined" : "uninitialized /etc detected");
277
278 if (!notified)
279 log_notice("All rules containing unresolvable specifiers will be skipped.");
280
281 notified = true;
282 return 0;
283 }
284
285 static int user_config_paths(char*** ret) {
286 _cleanup_strv_free_ char **config_dirs = NULL, **data_dirs = NULL;
287 _cleanup_free_ char *persistent_config = NULL, *runtime_config = NULL, *data_home = NULL;
288 _cleanup_strv_free_ char **res = NULL;
289 int r;
290
291 r = xdg_user_dirs(&config_dirs, &data_dirs);
292 if (r < 0)
293 return r;
294
295 r = xdg_user_config_dir(&persistent_config, "/user-tmpfiles.d");
296 if (r < 0 && r != -ENXIO)
297 return r;
298
299 r = xdg_user_runtime_dir(&runtime_config, "/user-tmpfiles.d");
300 if (r < 0 && r != -ENXIO)
301 return r;
302
303 r = xdg_user_data_dir(&data_home, "/user-tmpfiles.d");
304 if (r < 0 && r != -ENXIO)
305 return r;
306
307 r = strv_extend_strv_concat(&res, config_dirs, "/user-tmpfiles.d");
308 if (r < 0)
309 return r;
310
311 r = strv_extend(&res, persistent_config);
312 if (r < 0)
313 return r;
314
315 r = strv_extend(&res, runtime_config);
316 if (r < 0)
317 return r;
318
319 r = strv_extend(&res, data_home);
320 if (r < 0)
321 return r;
322
323 r = strv_extend_strv_concat(&res, data_dirs, "/user-tmpfiles.d");
324 if (r < 0)
325 return r;
326
327 r = path_strv_make_absolute_cwd(res);
328 if (r < 0)
329 return r;
330
331 *ret = TAKE_PTR(res);
332 return 0;
333 }
334
335 static bool needs_glob(ItemType t) {
336 return IN_SET(t,
337 WRITE_FILE,
338 IGNORE_PATH,
339 IGNORE_DIRECTORY_PATH,
340 REMOVE_PATH,
341 RECURSIVE_REMOVE_PATH,
342 EMPTY_DIRECTORY,
343 ADJUST_MODE,
344 RELABEL_PATH,
345 RECURSIVE_RELABEL_PATH,
346 SET_XATTR,
347 RECURSIVE_SET_XATTR,
348 SET_ACL,
349 RECURSIVE_SET_ACL,
350 SET_ATTRIBUTE,
351 RECURSIVE_SET_ATTRIBUTE);
352 }
353
354 static bool takes_ownership(ItemType t) {
355 return IN_SET(t,
356 CREATE_FILE,
357 TRUNCATE_FILE,
358 CREATE_DIRECTORY,
359 EMPTY_DIRECTORY,
360 TRUNCATE_DIRECTORY,
361 CREATE_SUBVOLUME,
362 CREATE_SUBVOLUME_INHERIT_QUOTA,
363 CREATE_SUBVOLUME_NEW_QUOTA,
364 CREATE_FIFO,
365 CREATE_SYMLINK,
366 CREATE_CHAR_DEVICE,
367 CREATE_BLOCK_DEVICE,
368 COPY_FILES,
369 WRITE_FILE,
370 IGNORE_PATH,
371 IGNORE_DIRECTORY_PATH,
372 REMOVE_PATH,
373 RECURSIVE_REMOVE_PATH);
374 }
375
376 static struct Item* find_glob(OrderedHashmap *h, const char *match) {
377 ItemArray *j;
378
379 ORDERED_HASHMAP_FOREACH(j, h) {
380 size_t n;
381
382 for (n = 0; n < j->n_items; n++) {
383 Item *item = j->items + n;
384
385 if (fnmatch(item->path, match, FNM_PATHNAME|FNM_PERIOD) == 0)
386 return item;
387 }
388 }
389
390 return NULL;
391 }
392
393 static int load_unix_sockets(void) {
394 _cleanup_set_free_free_ Set *sockets = NULL;
395 _cleanup_fclose_ FILE *f = NULL;
396 int r;
397
398 if (unix_sockets)
399 return 0;
400
401 /* We maintain a cache of the sockets we found in /proc/net/unix to speed things up a little. */
402
403 sockets = set_new(&path_hash_ops);
404 if (!sockets)
405 return log_oom();
406
407 f = fopen("/proc/net/unix", "re");
408 if (!f)
409 return log_full_errno(errno == ENOENT ? LOG_DEBUG : LOG_WARNING, errno,
410 "Failed to open /proc/net/unix, ignoring: %m");
411
412 /* Skip header */
413 r = read_line(f, LONG_LINE_MAX, NULL);
414 if (r < 0)
415 return log_warning_errno(r, "Failed to skip /proc/net/unix header line: %m");
416 if (r == 0)
417 return log_warning_errno(SYNTHETIC_ERRNO(EIO), "Premature end of file reading /proc/net/unix.");
418
419 for (;;) {
420 _cleanup_free_ char *line = NULL, *s = NULL;
421 char *p;
422
423 r = read_line(f, LONG_LINE_MAX, &line);
424 if (r < 0)
425 return log_warning_errno(r, "Failed to read /proc/net/unix line, ignoring: %m");
426 if (r == 0) /* EOF */
427 break;
428
429 p = strchr(line, ':');
430 if (!p)
431 continue;
432
433 if (strlen(p) < 37)
434 continue;
435
436 p += 37;
437 p += strspn(p, WHITESPACE);
438 p += strcspn(p, WHITESPACE); /* skip one more word */
439 p += strspn(p, WHITESPACE);
440
441 if (*p != '/')
442 continue;
443
444 s = strdup(p);
445 if (!s)
446 return log_oom();
447
448 path_simplify(s, false);
449
450 r = set_consume(sockets, s);
451 if (r == -EEXIST)
452 continue;
453 if (r < 0)
454 return log_warning_errno(r, "Failed to add AF_UNIX socket to set, ignoring: %m");
455
456 TAKE_PTR(s);
457 }
458
459 unix_sockets = TAKE_PTR(sockets);
460 return 1;
461 }
462
463 static bool unix_socket_alive(const char *fn) {
464 assert(fn);
465
466 if (load_unix_sockets() < 0)
467 return true; /* We don't know, so assume yes */
468
469 return !!set_get(unix_sockets, (char*) fn);
470 }
471
472 static DIR* xopendirat_nomod(int dirfd, const char *path) {
473 DIR *dir;
474
475 dir = xopendirat(dirfd, path, O_NOFOLLOW|O_NOATIME);
476 if (dir)
477 return dir;
478
479 log_debug_errno(errno, "Cannot open %sdirectory \"%s\": %m", dirfd == AT_FDCWD ? "" : "sub", path);
480 if (errno != EPERM)
481 return NULL;
482
483 dir = xopendirat(dirfd, path, O_NOFOLLOW);
484 if (!dir)
485 log_debug_errno(errno, "Cannot open %sdirectory \"%s\": %m", dirfd == AT_FDCWD ? "" : "sub", path);
486
487 return dir;
488 }
489
490 static DIR* opendir_nomod(const char *path) {
491 return xopendirat_nomod(AT_FDCWD, path);
492 }
493
494 static inline nsec_t load_statx_timestamp_nsec(const struct statx_timestamp *ts) {
495 assert(ts);
496
497 if (ts->tv_sec < 0)
498 return NSEC_INFINITY;
499
500 if ((nsec_t) ts->tv_sec >= (UINT64_MAX - ts->tv_nsec) / NSEC_PER_SEC)
501 return NSEC_INFINITY;
502
503 return ts->tv_sec * NSEC_PER_SEC + ts->tv_nsec;
504 }
505
506 static int dir_cleanup(
507 Item *i,
508 const char *p,
509 DIR *d,
510 nsec_t self_atime_nsec,
511 nsec_t self_mtime_nsec,
512 nsec_t cutoff_nsec,
513 dev_t rootdev_major,
514 dev_t rootdev_minor,
515 bool mountpoint,
516 int maxdepth,
517 bool keep_this_level) {
518
519 bool deleted = false;
520 struct dirent *dent;
521 int r = 0;
522
523 FOREACH_DIRENT_ALL(dent, d, break) {
524 _cleanup_free_ char *sub_path = NULL;
525 nsec_t atime_nsec, mtime_nsec, ctime_nsec, btime_nsec;
526
527 if (dot_or_dot_dot(dent->d_name))
528 continue;
529
530 /* If statx() is supported, use it. It's preferable over fstatat() since it tells us
531 * explicitly where we are looking at a mount point, for free as side information. Determing
532 * the same information without statx() is hard, see the complexity of path_is_mount_point(),
533 * and also much slower as it requires a number of syscalls instead of just one. Hence, when
534 * we have modern statx() we use it instead of fstat() and do proper mount point checks,
535 * while on older kernels's well do traditional st_dev based detection of mount points.
536 *
537 * Using statx() for detecting mount points also has the benfit that we handle weird file
538 * systems such as overlayfs better where each file is originating from a different
539 * st_dev. */
540
541 STRUCT_STATX_DEFINE(sx);
542
543 r = statx_fallback(
544 dirfd(d), dent->d_name,
545 AT_SYMLINK_NOFOLLOW|AT_NO_AUTOMOUNT,
546 STATX_TYPE|STATX_MODE|STATX_UID|STATX_ATIME|STATX_MTIME|STATX_CTIME|STATX_BTIME,
547 &sx);
548 if (r == -ENOENT)
549 continue;
550 if (r < 0) {
551 /* FUSE, NFS mounts, SELinux might return EACCES */
552 r = log_full_errno(errno == EACCES ? LOG_DEBUG : LOG_ERR, errno,
553 "statx(%s/%s) failed: %m", p, dent->d_name);
554 continue;
555 }
556
557 if (FLAGS_SET(sx.stx_attributes_mask, STATX_ATTR_MOUNT_ROOT)) {
558 /* Yay, we have the mount point API, use it */
559 if (FLAGS_SET(sx.stx_attributes, STATX_ATTR_MOUNT_ROOT)) {
560 log_debug("Ignoring \"%s/%s\": different mount points.", p, dent->d_name);
561 continue;
562 }
563 } else {
564 /* So we might have statx() but the STATX_ATTR_MOUNT_ROOT flag is not supported, fall
565 * back to traditional stx_dev checking. */
566 if (sx.stx_dev_major != rootdev_major ||
567 sx.stx_dev_minor != rootdev_minor) {
568 log_debug("Ignoring \"%s/%s\": different filesystem.", p, dent->d_name);
569 continue;
570 }
571
572 /* Try to detect bind mounts of the same filesystem instance; they do not differ in device
573 * major/minors. This type of query is not supported on all kernels or filesystem types
574 * though. */
575 if (S_ISDIR(sx.stx_mode)) {
576 int q;
577
578 q = fd_is_mount_point(dirfd(d), dent->d_name, 0);
579 if (q < 0)
580 log_debug_errno(q, "Failed to determine whether \"%s/%s\" is a mount point, ignoring: %m", p, dent->d_name);
581 else if (q > 0) {
582 log_debug("Ignoring \"%s/%s\": different mount of the same filesystem.", p, dent->d_name);
583 continue;
584 }
585 }
586 }
587
588 atime_nsec = FLAGS_SET(sx.stx_mask, STATX_ATIME) ? load_statx_timestamp_nsec(&sx.stx_atime) : 0;
589 mtime_nsec = FLAGS_SET(sx.stx_mask, STATX_MTIME) ? load_statx_timestamp_nsec(&sx.stx_mtime) : 0;
590 ctime_nsec = FLAGS_SET(sx.stx_mask, STATX_CTIME) ? load_statx_timestamp_nsec(&sx.stx_ctime) : 0;
591 btime_nsec = FLAGS_SET(sx.stx_mask, STATX_BTIME) ? load_statx_timestamp_nsec(&sx.stx_btime) : 0;
592
593 sub_path = path_join(p, dent->d_name);
594 if (!sub_path) {
595 r = log_oom();
596 goto finish;
597 }
598
599 /* Is there an item configured for this path? */
600 if (ordered_hashmap_get(items, sub_path)) {
601 log_debug("Ignoring \"%s\": a separate entry exists.", sub_path);
602 continue;
603 }
604
605 if (find_glob(globs, sub_path)) {
606 log_debug("Ignoring \"%s\": a separate glob exists.", sub_path);
607 continue;
608 }
609
610 if (S_ISDIR(sx.stx_mode)) {
611 _cleanup_closedir_ DIR *sub_dir = NULL;
612
613 if (mountpoint &&
614 streq(dent->d_name, "lost+found") &&
615 sx.stx_uid == 0) {
616 log_debug("Ignoring directory \"%s\".", sub_path);
617 continue;
618 }
619
620 if (maxdepth <= 0)
621 log_warning("Reached max depth on \"%s\".", sub_path);
622 else {
623 int q;
624
625 sub_dir = xopendirat_nomod(dirfd(d), dent->d_name);
626 if (!sub_dir) {
627 if (errno != ENOENT)
628 r = log_warning_errno(errno, "Opening directory \"%s\" failed, ignoring: %m", sub_path);
629
630 continue;
631 }
632
633 if (flock(dirfd(sub_dir), LOCK_EX|LOCK_NB) < 0) {
634 log_debug_errno(errno, "Couldn't acquire shared BSD lock on directory \"%s\", skipping: %m", p);
635 continue;
636 }
637
638 q = dir_cleanup(i,
639 sub_path, sub_dir,
640 atime_nsec, mtime_nsec, cutoff_nsec,
641 rootdev_major, rootdev_minor,
642 false, maxdepth-1, false);
643 if (q < 0)
644 r = q;
645 }
646
647 /* Note: if you are wondering why we don't support the sticky bit for excluding
648 * directories from cleaning like we do it for other file system objects: well, the
649 * sticky bit already has a meaning for directories, so we don't want to overload
650 * that. */
651
652 if (keep_this_level) {
653 log_debug("Keeping directory \"%s\".", sub_path);
654 continue;
655 }
656
657 /* Ignore ctime, we change it when deleting */
658 if (mtime_nsec != NSEC_INFINITY && mtime_nsec >= cutoff_nsec) {
659 char a[FORMAT_TIMESTAMP_MAX];
660 /* Follows spelling in stat(1). */
661 log_debug("Directory \"%s\": modify time %s is too new.",
662 sub_path,
663 format_timestamp_style(a, sizeof(a), mtime_nsec / NSEC_PER_USEC, TIMESTAMP_US));
664 continue;
665 }
666
667 if (atime_nsec != NSEC_INFINITY && atime_nsec >= cutoff_nsec) {
668 char a[FORMAT_TIMESTAMP_MAX];
669 log_debug("Directory \"%s\": access time %s is too new.",
670 sub_path,
671 format_timestamp_style(a, sizeof(a), atime_nsec / NSEC_PER_USEC, TIMESTAMP_US));
672 continue;
673 }
674
675 if (btime_nsec != NSEC_INFINITY && btime_nsec >= cutoff_nsec) {
676 char a[FORMAT_TIMESTAMP_MAX];
677 log_debug("Directory \"%s\": birth time %s is too new.",
678 sub_path,
679 format_timestamp_style(a, sizeof(a), btime_nsec / NSEC_PER_USEC, TIMESTAMP_US));
680 continue;
681 }
682
683 log_debug("Removing directory \"%s\".", sub_path);
684 if (unlinkat(dirfd(d), dent->d_name, AT_REMOVEDIR) < 0)
685 if (!IN_SET(errno, ENOENT, ENOTEMPTY))
686 r = log_warning_errno(errno, "Failed to remove directory \"%s\", ignoring: %m", sub_path);
687
688 } else {
689 /* Skip files for which the sticky bit is set. These are semantics we define, and are
690 * unknown elsewhere. See XDG_RUNTIME_DIR specification for details. */
691 if (sx.stx_mode & S_ISVTX) {
692 log_debug("Skipping \"%s\": sticky bit set.", sub_path);
693 continue;
694 }
695
696 if (mountpoint &&
697 S_ISREG(sx.stx_mode) &&
698 sx.stx_uid == 0 &&
699 STR_IN_SET(dent->d_name,
700 ".journal",
701 "aquota.user",
702 "aquota.group")) {
703 log_debug("Skipping \"%s\".", sub_path);
704 continue;
705 }
706
707 /* Ignore sockets that are listed in /proc/net/unix */
708 if (S_ISSOCK(sx.stx_mode) && unix_socket_alive(sub_path)) {
709 log_debug("Skipping \"%s\": live socket.", sub_path);
710 continue;
711 }
712
713 /* Ignore device nodes */
714 if (S_ISCHR(sx.stx_mode) || S_ISBLK(sx.stx_mode)) {
715 log_debug("Skipping \"%s\": a device.", sub_path);
716 continue;
717 }
718
719 /* Keep files on this level around if this is requested */
720 if (keep_this_level) {
721 log_debug("Keeping \"%s\".", sub_path);
722 continue;
723 }
724
725 if (mtime_nsec != NSEC_INFINITY && mtime_nsec >= cutoff_nsec) {
726 char a[FORMAT_TIMESTAMP_MAX];
727 /* Follows spelling in stat(1). */
728 log_debug("File \"%s\": modify time %s is too new.",
729 sub_path,
730 format_timestamp_style(a, sizeof(a), mtime_nsec / NSEC_PER_USEC, TIMESTAMP_US));
731 continue;
732 }
733
734 if (atime_nsec != NSEC_INFINITY && atime_nsec >= cutoff_nsec) {
735 char a[FORMAT_TIMESTAMP_MAX];
736 log_debug("File \"%s\": access time %s is too new.",
737 sub_path,
738 format_timestamp_style(a, sizeof(a), atime_nsec / NSEC_PER_USEC, TIMESTAMP_US));
739 continue;
740 }
741
742 if (ctime_nsec != NSEC_INFINITY && ctime_nsec >= cutoff_nsec) {
743 char a[FORMAT_TIMESTAMP_MAX];
744 log_debug("File \"%s\": change time %s is too new.",
745 sub_path,
746 format_timestamp_style(a, sizeof(a), ctime_nsec / NSEC_PER_USEC, TIMESTAMP_US));
747 continue;
748 }
749
750 if (btime_nsec != NSEC_INFINITY && btime_nsec >= cutoff_nsec) {
751 char a[FORMAT_TIMESTAMP_MAX];
752 log_debug("File \"%s\": birth time %s is too new.",
753 sub_path,
754 format_timestamp_style(a, sizeof(a), btime_nsec / NSEC_PER_USEC, TIMESTAMP_US));
755 continue;
756 }
757
758 log_debug("Removing \"%s\".", sub_path);
759 if (unlinkat(dirfd(d), dent->d_name, 0) < 0)
760 if (errno != ENOENT)
761 r = log_warning_errno(errno, "Failed to remove \"%s\", ignoring: %m", sub_path);
762
763 deleted = true;
764 }
765 }
766
767 finish:
768 if (deleted) {
769 char a[FORMAT_TIMESTAMP_MAX], m[FORMAT_TIMESTAMP_MAX];
770 struct timespec ts[2];
771
772 log_debug("Restoring access and modification time on \"%s\": %s, %s",
773 p,
774 format_timestamp_style(a, sizeof(a), self_atime_nsec / NSEC_PER_USEC, TIMESTAMP_US),
775 format_timestamp_style(m, sizeof(m), self_mtime_nsec / NSEC_PER_USEC, TIMESTAMP_US));
776
777 timespec_store_nsec(ts + 0, self_atime_nsec);
778 timespec_store_nsec(ts + 1, self_mtime_nsec);
779
780 /* Restore original directory timestamps */
781 if (futimens(dirfd(d), ts) < 0)
782 log_warning_errno(errno, "Failed to revert timestamps of '%s', ignoring: %m", p);
783 }
784
785 return r;
786 }
787
788 static bool dangerous_hardlinks(void) {
789 _cleanup_free_ char *value = NULL;
790 static int cached = -1;
791 int r;
792
793 /* Check whether the fs.protected_hardlinks sysctl is on. If we can't determine it we assume its off, as that's
794 * what the upstream default is. */
795
796 if (cached >= 0)
797 return cached;
798
799 r = read_one_line_file("/proc/sys/fs/protected_hardlinks", &value);
800 if (r < 0) {
801 log_debug_errno(r, "Failed to read fs.protected_hardlinks sysctl: %m");
802 return true;
803 }
804
805 r = parse_boolean(value);
806 if (r < 0) {
807 log_debug_errno(r, "Failed to parse fs.protected_hardlinks sysctl: %m");
808 return true;
809 }
810
811 cached = r == 0;
812 return cached;
813 }
814
815 static bool hardlink_vulnerable(const struct stat *st) {
816 assert(st);
817
818 return !S_ISDIR(st->st_mode) && st->st_nlink > 1 && dangerous_hardlinks();
819 }
820
821 static mode_t process_mask_perms(mode_t mode, mode_t current) {
822
823 if ((current & 0111) == 0)
824 mode &= ~0111;
825 if ((current & 0222) == 0)
826 mode &= ~0222;
827 if ((current & 0444) == 0)
828 mode &= ~0444;
829 if (!S_ISDIR(current))
830 mode &= ~07000; /* remove sticky/sgid/suid bit, unless directory */
831
832 return mode;
833 }
834
835 static int fd_set_perms(Item *i, int fd, const char *path, const struct stat *st) {
836 struct stat stbuf;
837 mode_t new_mode;
838 bool do_chown;
839
840 assert(i);
841 assert(fd);
842 assert(path);
843
844 if (!i->mode_set && !i->uid_set && !i->gid_set)
845 goto shortcut;
846
847 if (!st) {
848 if (fstat(fd, &stbuf) < 0)
849 return log_error_errno(errno, "fstat(%s) failed: %m", path);
850 st = &stbuf;
851 }
852
853 if (hardlink_vulnerable(st))
854 return log_error_errno(SYNTHETIC_ERRNO(EPERM),
855 "Refusing to set permissions on hardlinked file %s while the fs.protected_hardlinks sysctl is turned off.",
856 path);
857
858 /* Do we need a chown()? */
859 do_chown =
860 (i->uid_set && i->uid != st->st_uid) ||
861 (i->gid_set && i->gid != st->st_gid);
862
863 /* Calculate the mode to apply */
864 new_mode = i->mode_set ? (i->mask_perms ?
865 process_mask_perms(i->mode, st->st_mode) :
866 i->mode) :
867 (st->st_mode & 07777);
868
869 if (i->mode_set && do_chown) {
870 /* Before we issue the chmod() let's reduce the access mode to the common bits of the old and
871 * the new mode. That way there's no time window where the file exists under the old owner
872 * with more than the old access modes — and not under the new owner with more than the new
873 * access modes either. */
874
875 if (S_ISLNK(st->st_mode))
876 log_debug("Skipping temporary mode fix for symlink %s.", path);
877 else {
878 mode_t m = new_mode & st->st_mode; /* Mask new mode by old mode */
879
880 if (((m ^ st->st_mode) & 07777) == 0)
881 log_debug("\"%s\" matches temporary mode %o already.", path, m);
882 else {
883 log_debug("Temporarily changing \"%s\" to mode %o.", path, m);
884 if (fchmod_opath(fd, m) < 0)
885 return log_error_errno(errno, "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 if (fchmod_opath(fd, new_mode) < 0)
917 return log_error_errno(errno, "fchmod() of %s failed: %m", path);
918 }
919 }
920 }
921
922 shortcut:
923 return label_fix(path, 0);
924 }
925
926 static int path_open_parent_safe(const char *path) {
927 _cleanup_free_ char *dn = NULL;
928 int r, fd;
929
930 if (path_equal(path, "/") || !path_is_normalized(path))
931 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
932 "Failed to open parent of '%s': invalid path.",
933 path);
934
935 dn = dirname_malloc(path);
936 if (!dn)
937 return log_oom();
938
939 r = chase_symlinks(dn, arg_root, CHASE_SAFE|CHASE_WARN, NULL, &fd);
940 if (r < 0 && r != -ENOLINK)
941 return log_error_errno(r, "Failed to validate path %s: %m", path);
942
943 return r < 0 ? r : fd;
944 }
945
946 static int path_open_safe(const char *path) {
947 int r, fd;
948
949 /* path_open_safe() returns a file descriptor opened with O_PATH after
950 * verifying that the path doesn't contain unsafe transitions, except
951 * for its final component as the function does not follow symlink. */
952
953 assert(path);
954
955 if (!path_is_normalized(path))
956 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
957 "Failed to open invalid path '%s'.",
958 path);
959
960 r = chase_symlinks(path, arg_root, CHASE_SAFE|CHASE_WARN|CHASE_NOFOLLOW, NULL, &fd);
961 if (r < 0 && r != -ENOLINK)
962 return log_error_errno(r, "Failed to validate path %s: %m", path);
963
964 return r < 0 ? r : fd;
965 }
966
967 static int path_set_perms(Item *i, const char *path) {
968 _cleanup_close_ int fd = -1;
969
970 assert(i);
971 assert(path);
972
973 fd = path_open_safe(path);
974 if (fd < 0)
975 return fd;
976
977 return fd_set_perms(i, fd, path, NULL);
978 }
979
980 static int parse_xattrs_from_arg(Item *i) {
981 const char *p;
982 int r;
983
984 assert(i);
985 assert(i->argument);
986
987 p = i->argument;
988
989 for (;;) {
990 _cleanup_free_ char *name = NULL, *value = NULL, *xattr = NULL;
991
992 r = extract_first_word(&p, &xattr, NULL, EXTRACT_UNQUOTE|EXTRACT_CUNESCAPE);
993 if (r < 0)
994 log_warning_errno(r, "Failed to parse extended attribute '%s', ignoring: %m", p);
995 if (r <= 0)
996 break;
997
998 r = split_pair(xattr, "=", &name, &value);
999 if (r < 0) {
1000 log_warning_errno(r, "Failed to parse extended attribute, ignoring: %s", xattr);
1001 continue;
1002 }
1003
1004 if (isempty(name) || isempty(value)) {
1005 log_warning("Malformed extended attribute found, ignoring: %s", xattr);
1006 continue;
1007 }
1008
1009 if (strv_push_pair(&i->xattrs, name, value) < 0)
1010 return log_oom();
1011
1012 name = value = NULL;
1013 }
1014
1015 return 0;
1016 }
1017
1018 static int fd_set_xattrs(Item *i, int fd, const char *path, const struct stat *st) {
1019 char procfs_path[STRLEN("/proc/self/fd/") + DECIMAL_STR_MAX(int)];
1020 char **name, **value;
1021
1022 assert(i);
1023 assert(fd);
1024 assert(path);
1025
1026 xsprintf(procfs_path, "/proc/self/fd/%i", fd);
1027
1028 STRV_FOREACH_PAIR(name, value, i->xattrs) {
1029 log_debug("Setting extended attribute '%s=%s' on %s.", *name, *value, path);
1030 if (setxattr(procfs_path, *name, *value, strlen(*value), 0) < 0)
1031 return log_error_errno(errno, "Setting extended attribute %s=%s on %s failed: %m",
1032 *name, *value, path);
1033 }
1034 return 0;
1035 }
1036
1037 static int path_set_xattrs(Item *i, const char *path) {
1038 _cleanup_close_ int fd = -1;
1039
1040 assert(i);
1041 assert(path);
1042
1043 fd = path_open_safe(path);
1044 if (fd < 0)
1045 return fd;
1046
1047 return fd_set_xattrs(i, fd, path, NULL);
1048 }
1049
1050 static int parse_acls_from_arg(Item *item) {
1051 #if HAVE_ACL
1052 int r;
1053
1054 assert(item);
1055
1056 /* If append_or_force (= modify) is set, we will not modify the acl
1057 * afterwards, so the mask can be added now if necessary. */
1058
1059 r = parse_acl(item->argument, &item->acl_access, &item->acl_default, !item->append_or_force);
1060 if (r < 0)
1061 log_warning_errno(r, "Failed to parse ACL \"%s\": %m. Ignoring", item->argument);
1062 #else
1063 log_warning_errno(SYNTHETIC_ERRNO(ENOSYS), "ACLs are not supported. Ignoring");
1064 #endif
1065
1066 return 0;
1067 }
1068
1069 #if HAVE_ACL
1070 static int path_set_acl(const char *path, const char *pretty, acl_type_t type, acl_t acl, bool modify) {
1071 _cleanup_(acl_free_charpp) char *t = NULL;
1072 _cleanup_(acl_freep) acl_t dup = NULL;
1073 int r;
1074
1075 /* Returns 0 for success, positive error if already warned,
1076 * negative error otherwise. */
1077
1078 if (modify) {
1079 r = acls_for_file(path, type, acl, &dup);
1080 if (r < 0)
1081 return r;
1082
1083 r = calc_acl_mask_if_needed(&dup);
1084 if (r < 0)
1085 return r;
1086 } else {
1087 dup = acl_dup(acl);
1088 if (!dup)
1089 return -errno;
1090
1091 /* the mask was already added earlier if needed */
1092 }
1093
1094 r = add_base_acls_if_needed(&dup, path);
1095 if (r < 0)
1096 return r;
1097
1098 t = acl_to_any_text(dup, NULL, ',', TEXT_ABBREVIATE);
1099 log_debug("Setting %s ACL %s on %s.",
1100 type == ACL_TYPE_ACCESS ? "access" : "default",
1101 strna(t), pretty);
1102
1103 r = acl_set_file(path, type, dup);
1104 if (r < 0)
1105 /* Return positive to indicate we already warned */
1106 return -log_error_errno(errno,
1107 "Setting %s ACL \"%s\" on %s failed: %m",
1108 type == ACL_TYPE_ACCESS ? "access" : "default",
1109 strna(t), pretty);
1110
1111 return 0;
1112 }
1113 #endif
1114
1115 static int fd_set_acls(Item *item, int fd, const char *path, const struct stat *st) {
1116 int r = 0;
1117 #if HAVE_ACL
1118 char procfs_path[STRLEN("/proc/self/fd/") + DECIMAL_STR_MAX(int)];
1119 struct stat stbuf;
1120
1121 assert(item);
1122 assert(fd);
1123 assert(path);
1124
1125 if (!st) {
1126 if (fstat(fd, &stbuf) < 0)
1127 return log_error_errno(errno, "fstat(%s) failed: %m", path);
1128 st = &stbuf;
1129 }
1130
1131 if (hardlink_vulnerable(st))
1132 return log_error_errno(SYNTHETIC_ERRNO(EPERM),
1133 "Refusing to set ACLs on hardlinked file %s while the fs.protected_hardlinks sysctl is turned off.",
1134 path);
1135
1136 if (S_ISLNK(st->st_mode)) {
1137 log_debug("Skipping ACL fix for symlink %s.", path);
1138 return 0;
1139 }
1140
1141 xsprintf(procfs_path, "/proc/self/fd/%i", fd);
1142
1143 if (item->acl_access)
1144 r = path_set_acl(procfs_path, path, ACL_TYPE_ACCESS, item->acl_access, item->append_or_force);
1145
1146 /* set only default acls to folders */
1147 if (r == 0 && item->acl_default && S_ISDIR(st->st_mode))
1148 r = path_set_acl(procfs_path, path, ACL_TYPE_DEFAULT, item->acl_default, item->append_or_force);
1149
1150 if (r > 0)
1151 return -r; /* already warned */
1152
1153 /* The above procfs paths don't work if /proc is not mounted. */
1154 if (r == -ENOENT && proc_mounted() == 0)
1155 r = -ENOSYS;
1156
1157 if (r == -EOPNOTSUPP) {
1158 log_debug_errno(r, "ACLs not supported by file system at %s", path);
1159 return 0;
1160 }
1161 if (r < 0)
1162 return log_error_errno(r, "ACL operation on \"%s\" failed: %m", path);
1163 #endif
1164 return r;
1165 }
1166
1167 static int path_set_acls(Item *item, const char *path) {
1168 int r = 0;
1169 #if HAVE_ACL
1170 _cleanup_close_ int fd = -1;
1171
1172 assert(item);
1173 assert(path);
1174
1175 fd = path_open_safe(path);
1176 if (fd < 0)
1177 return fd;
1178
1179 r = fd_set_acls(item, fd, path, NULL);
1180 #endif
1181 return r;
1182 }
1183
1184 static int parse_attribute_from_arg(Item *item) {
1185
1186 static const struct {
1187 char character;
1188 unsigned value;
1189 } attributes[] = {
1190 { 'A', FS_NOATIME_FL }, /* do not update atime */
1191 { 'S', FS_SYNC_FL }, /* Synchronous updates */
1192 { 'D', FS_DIRSYNC_FL }, /* dirsync behaviour (directories only) */
1193 { 'a', FS_APPEND_FL }, /* writes to file may only append */
1194 { 'c', FS_COMPR_FL }, /* Compress file */
1195 { 'd', FS_NODUMP_FL }, /* do not dump file */
1196 { 'e', FS_EXTENT_FL }, /* Extents */
1197 { 'i', FS_IMMUTABLE_FL }, /* Immutable file */
1198 { 'j', FS_JOURNAL_DATA_FL }, /* Reserved for ext3 */
1199 { 's', FS_SECRM_FL }, /* Secure deletion */
1200 { 'u', FS_UNRM_FL }, /* Undelete */
1201 { 't', FS_NOTAIL_FL }, /* file tail should not be merged */
1202 { 'T', FS_TOPDIR_FL }, /* Top of directory hierarchies */
1203 { 'C', FS_NOCOW_FL }, /* Do not cow file */
1204 { 'P', FS_PROJINHERIT_FL }, /* Inherit the quota project ID */
1205 };
1206
1207 enum {
1208 MODE_ADD,
1209 MODE_DEL,
1210 MODE_SET
1211 } mode = MODE_ADD;
1212
1213 unsigned value = 0, mask = 0;
1214 const char *p;
1215
1216 assert(item);
1217
1218 p = item->argument;
1219 if (p) {
1220 if (*p == '+') {
1221 mode = MODE_ADD;
1222 p++;
1223 } else if (*p == '-') {
1224 mode = MODE_DEL;
1225 p++;
1226 } else if (*p == '=') {
1227 mode = MODE_SET;
1228 p++;
1229 }
1230 }
1231
1232 if (isempty(p) && mode != MODE_SET)
1233 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
1234 "Setting file attribute on '%s' needs an attribute specification.",
1235 item->path);
1236
1237 for (; p && *p ; p++) {
1238 unsigned i, v;
1239
1240 for (i = 0; i < ELEMENTSOF(attributes); i++)
1241 if (*p == attributes[i].character)
1242 break;
1243
1244 if (i >= ELEMENTSOF(attributes))
1245 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
1246 "Unknown file attribute '%c' on '%s'.",
1247 *p, item->path);
1248
1249 v = attributes[i].value;
1250
1251 SET_FLAG(value, v, IN_SET(mode, MODE_ADD, MODE_SET));
1252
1253 mask |= v;
1254 }
1255
1256 if (mode == MODE_SET)
1257 mask |= CHATTR_ALL_FL;
1258
1259 assert(mask != 0);
1260
1261 item->attribute_mask = mask;
1262 item->attribute_value = value;
1263 item->attribute_set = true;
1264
1265 return 0;
1266 }
1267
1268 static int fd_set_attribute(Item *item, int fd, const char *path, const struct stat *st) {
1269 _cleanup_close_ int procfs_fd = -1;
1270 struct stat stbuf;
1271 unsigned f;
1272 int r;
1273
1274 assert(item);
1275 assert(fd);
1276 assert(path);
1277
1278 if (!item->attribute_set || item->attribute_mask == 0)
1279 return 0;
1280
1281 if (!st) {
1282 if (fstat(fd, &stbuf) < 0)
1283 return log_error_errno(errno, "fstat(%s) failed: %m", path);
1284 st = &stbuf;
1285 }
1286
1287 /* Issuing the file attribute ioctls on device nodes is not
1288 * safe, as that will be delivered to the drivers, not the
1289 * file system containing the device node. */
1290 if (!S_ISREG(st->st_mode) && !S_ISDIR(st->st_mode))
1291 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
1292 "Setting file flags is only supported on regular files and directories, cannot set on '%s'.",
1293 path);
1294
1295 f = item->attribute_value & item->attribute_mask;
1296
1297 /* Mask away directory-specific flags */
1298 if (!S_ISDIR(st->st_mode))
1299 f &= ~FS_DIRSYNC_FL;
1300
1301 procfs_fd = fd_reopen(fd, O_RDONLY|O_CLOEXEC|O_NOATIME);
1302 if (procfs_fd < 0)
1303 return log_error_errno(procfs_fd, "Failed to re-open '%s': %m", path);
1304
1305 r = chattr_fd(procfs_fd, f, item->attribute_mask, NULL);
1306 if (r < 0)
1307 log_full_errno(IN_SET(r, -ENOTTY, -EOPNOTSUPP) ? LOG_DEBUG : LOG_WARNING,
1308 r,
1309 "Cannot set file attribute for '%s', value=0x%08x, mask=0x%08x, ignoring: %m",
1310 path, item->attribute_value, item->attribute_mask);
1311
1312 return 0;
1313 }
1314
1315 static int path_set_attribute(Item *item, const char *path) {
1316 _cleanup_close_ int fd = -1;
1317
1318 if (!item->attribute_set || item->attribute_mask == 0)
1319 return 0;
1320
1321 fd = path_open_safe(path);
1322 if (fd < 0)
1323 return fd;
1324
1325 return fd_set_attribute(item, fd, path, NULL);
1326 }
1327
1328 static int write_one_file(Item *i, const char *path) {
1329 _cleanup_close_ int fd = -1, dir_fd = -1;
1330 char *bn;
1331 int r;
1332
1333 assert(i);
1334 assert(path);
1335 assert(i->argument);
1336 assert(i->type == WRITE_FILE);
1337
1338 /* Validate the path and keep the fd on the directory for opening the
1339 * file so we're sure that it can't be changed behind our back. */
1340 dir_fd = path_open_parent_safe(path);
1341 if (dir_fd < 0)
1342 return dir_fd;
1343
1344 bn = basename(path);
1345
1346 /* Follows symlinks */
1347 fd = openat(dir_fd, bn,
1348 O_NONBLOCK|O_CLOEXEC|O_WRONLY|O_NOCTTY|(i->append_or_force ? O_APPEND : 0),
1349 i->mode);
1350 if (fd < 0) {
1351 if (errno == ENOENT) {
1352 log_debug_errno(errno, "Not writing missing file \"%s\": %m", path);
1353 return 0;
1354 }
1355
1356 if (i->allow_failure)
1357 return log_debug_errno(errno, "Failed to open file \"%s\", ignoring: %m", path);
1358
1359 return log_error_errno(errno, "Failed to open file \"%s\": %m", path);
1360 }
1361
1362 /* 'w' is allowed to write into any kind of files. */
1363 log_debug("Writing to \"%s\".", path);
1364
1365 r = loop_write(fd, i->argument, strlen(i->argument), false);
1366 if (r < 0)
1367 return log_error_errno(r, "Failed to write file \"%s\": %m", path);
1368
1369 return fd_set_perms(i, fd, path, NULL);
1370 }
1371
1372 static int create_file(Item *i, const char *path) {
1373 _cleanup_close_ int fd = -1, dir_fd = -1;
1374 struct stat stbuf, *st = NULL;
1375 int r = 0;
1376 char *bn;
1377
1378 assert(i);
1379 assert(path);
1380 assert(i->type == CREATE_FILE);
1381
1382 /* 'f' operates on regular files exclusively. */
1383
1384 /* Validate the path and keep the fd on the directory for opening the
1385 * file so we're sure that it can't be changed behind our back. */
1386 dir_fd = path_open_parent_safe(path);
1387 if (dir_fd < 0)
1388 return dir_fd;
1389
1390 bn = basename(path);
1391
1392 RUN_WITH_UMASK(0000) {
1393 mac_selinux_create_file_prepare(path, S_IFREG);
1394 fd = openat(dir_fd, bn, O_CREAT|O_EXCL|O_NOFOLLOW|O_NONBLOCK|O_CLOEXEC|O_WRONLY|O_NOCTTY, i->mode);
1395 mac_selinux_create_file_clear();
1396 }
1397
1398 if (fd < 0) {
1399 /* Even on a read-only filesystem, open(2) returns EEXIST if the
1400 * file already exists. It returns EROFS only if it needs to
1401 * create the file. */
1402 if (errno != EEXIST)
1403 return log_error_errno(errno, "Failed to create file %s: %m", path);
1404
1405 /* Re-open the file. At that point it must exist since open(2)
1406 * failed with EEXIST. We still need to check if the perms/mode
1407 * need to be changed. For read-only filesystems, we let
1408 * fd_set_perms() report the error if the perms need to be
1409 * modified. */
1410 fd = openat(dir_fd, bn, O_NOFOLLOW|O_CLOEXEC|O_PATH, i->mode);
1411 if (fd < 0)
1412 return log_error_errno(errno, "Failed to re-open file %s: %m", path);
1413
1414 if (fstat(fd, &stbuf) < 0)
1415 return log_error_errno(errno, "stat(%s) failed: %m", path);
1416
1417 if (!S_ISREG(stbuf.st_mode)) {
1418 log_error("%s exists and is not a regular file.", path);
1419 return -EEXIST;
1420 }
1421
1422 st = &stbuf;
1423 } else {
1424
1425 log_debug("\"%s\" has been created.", path);
1426
1427 if (i->argument) {
1428 log_debug("Writing to \"%s\".", path);
1429
1430 r = loop_write(fd, i->argument, strlen(i->argument), false);
1431 if (r < 0)
1432 return log_error_errno(r, "Failed to write file \"%s\": %m", path);
1433 }
1434 }
1435
1436 return fd_set_perms(i, fd, path, st);
1437 }
1438
1439 static int truncate_file(Item *i, const char *path) {
1440 _cleanup_close_ int fd = -1, dir_fd = -1;
1441 struct stat stbuf, *st = NULL;
1442 bool erofs = false;
1443 int r = 0;
1444 char *bn;
1445
1446 assert(i);
1447 assert(path);
1448 assert(i->type == TRUNCATE_FILE || (i->type == CREATE_FILE && i->append_or_force));
1449
1450 /* We want to operate on regular file exclusively especially since
1451 * O_TRUNC is unspecified if the file is neither a regular file nor a
1452 * fifo nor a terminal device. Therefore we first open the file and make
1453 * sure it's a regular one before truncating it. */
1454
1455 /* Validate the path and keep the fd on the directory for opening the
1456 * file so we're sure that it can't be changed behind our back. */
1457 dir_fd = path_open_parent_safe(path);
1458 if (dir_fd < 0)
1459 return dir_fd;
1460
1461 bn = basename(path);
1462
1463 RUN_WITH_UMASK(0000) {
1464 mac_selinux_create_file_prepare(path, S_IFREG);
1465 fd = openat(dir_fd, bn, O_CREAT|O_NOFOLLOW|O_NONBLOCK|O_CLOEXEC|O_WRONLY|O_NOCTTY, i->mode);
1466 mac_selinux_create_file_clear();
1467 }
1468
1469 if (fd < 0) {
1470 if (errno != EROFS)
1471 return log_error_errno(errno, "Failed to open/create file %s: %m", path);
1472
1473 /* On a read-only filesystem, we don't want to fail if the
1474 * target is already empty and the perms are set. So we still
1475 * proceed with the sanity checks and let the remaining
1476 * operations fail with EROFS if they try to modify the target
1477 * file. */
1478
1479 fd = openat(dir_fd, bn, O_NOFOLLOW|O_CLOEXEC|O_PATH, i->mode);
1480 if (fd < 0) {
1481 if (errno == ENOENT) {
1482 log_error("Cannot create file %s on a read-only file system.", path);
1483 return -EROFS;
1484 }
1485
1486 return log_error_errno(errno, "Failed to re-open file %s: %m", path);
1487 }
1488
1489 erofs = true;
1490 }
1491
1492 if (fstat(fd, &stbuf) < 0)
1493 return log_error_errno(errno, "stat(%s) failed: %m", path);
1494
1495 if (!S_ISREG(stbuf.st_mode)) {
1496 log_error("%s exists and is not a regular file.", path);
1497 return -EEXIST;
1498 }
1499
1500 if (stbuf.st_size > 0) {
1501 if (ftruncate(fd, 0) < 0) {
1502 r = erofs ? -EROFS : -errno;
1503 return log_error_errno(r, "Failed to truncate file %s: %m", path);
1504 }
1505 } else
1506 st = &stbuf;
1507
1508 log_debug("\"%s\" has been created.", path);
1509
1510 if (i->argument) {
1511 log_debug("Writing to \"%s\".", path);
1512
1513 r = loop_write(fd, i->argument, strlen(i->argument), false);
1514 if (r < 0) {
1515 r = erofs ? -EROFS : r;
1516 return log_error_errno(r, "Failed to write file %s: %m", path);
1517 }
1518 }
1519
1520 return fd_set_perms(i, fd, path, st);
1521 }
1522
1523 static int copy_files(Item *i) {
1524 _cleanup_close_ int dfd = -1, fd = -1;
1525 char *bn;
1526 int r;
1527
1528 log_debug("Copying tree \"%s\" to \"%s\".", i->argument, i->path);
1529
1530 bn = basename(i->path);
1531
1532 /* Validate the path and use the returned directory fd for copying the
1533 * target so we're sure that the path can't be changed behind our
1534 * back. */
1535 dfd = path_open_parent_safe(i->path);
1536 if (dfd < 0)
1537 return dfd;
1538
1539 r = copy_tree_at(AT_FDCWD, i->argument,
1540 dfd, bn,
1541 i->uid_set ? i->uid : UID_INVALID,
1542 i->gid_set ? i->gid : GID_INVALID,
1543 COPY_REFLINK | COPY_MERGE_EMPTY | COPY_MAC_CREATE);
1544 if (r < 0) {
1545 struct stat a, b;
1546
1547 /* If the target already exists on read-only filesystems, trying
1548 * to create the target will not fail with EEXIST but with
1549 * EROFS. */
1550 if (r == -EROFS && faccessat(dfd, bn, F_OK, AT_SYMLINK_NOFOLLOW) == 0)
1551 r = -EEXIST;
1552
1553 if (r != -EEXIST)
1554 return log_error_errno(r, "Failed to copy files to %s: %m", i->path);
1555
1556 if (stat(i->argument, &a) < 0)
1557 return log_error_errno(errno, "stat(%s) failed: %m", i->argument);
1558
1559 if (fstatat(dfd, bn, &b, AT_SYMLINK_NOFOLLOW) < 0)
1560 return log_error_errno(errno, "stat(%s) failed: %m", i->path);
1561
1562 if ((a.st_mode ^ b.st_mode) & S_IFMT) {
1563 log_debug("Can't copy to %s, file exists already and is of different type", i->path);
1564 return 0;
1565 }
1566 }
1567
1568 fd = openat(dfd, bn, O_NOFOLLOW|O_CLOEXEC|O_PATH);
1569 if (fd < 0)
1570 return log_error_errno(errno, "Failed to openat(%s): %m", i->path);
1571
1572 return fd_set_perms(i, fd, i->path, NULL);
1573 }
1574
1575 typedef enum {
1576 CREATION_NORMAL,
1577 CREATION_EXISTING,
1578 CREATION_FORCE,
1579 _CREATION_MODE_MAX,
1580 _CREATION_MODE_INVALID = -1
1581 } CreationMode;
1582
1583 static const char *const creation_mode_verb_table[_CREATION_MODE_MAX] = {
1584 [CREATION_NORMAL] = "Created",
1585 [CREATION_EXISTING] = "Found existing",
1586 [CREATION_FORCE] = "Created replacement",
1587 };
1588
1589 DEFINE_PRIVATE_STRING_TABLE_LOOKUP_TO_STRING(creation_mode_verb, CreationMode);
1590
1591 static int create_directory_or_subvolume(const char *path, mode_t mode, bool subvol, CreationMode *creation) {
1592 _cleanup_close_ int pfd = -1;
1593 CreationMode c;
1594 int r;
1595
1596 assert(path);
1597
1598 if (!creation)
1599 creation = &c;
1600
1601 pfd = path_open_parent_safe(path);
1602 if (pfd < 0)
1603 return pfd;
1604
1605 if (subvol) {
1606 if (btrfs_is_subvol(empty_to_root(arg_root)) <= 0)
1607
1608 /* Don't create a subvolume unless the root directory is
1609 * one, too. We do this under the assumption that if the
1610 * root directory is just a plain directory (i.e. very
1611 * light-weight), we shouldn't try to split it up into
1612 * subvolumes (i.e. more heavy-weight). Thus, chroot()
1613 * environments and suchlike will get a full brtfs
1614 * subvolume set up below their tree only if they
1615 * specifically set up a btrfs subvolume for the root
1616 * dir too. */
1617
1618 subvol = false;
1619 else {
1620 RUN_WITH_UMASK((~mode) & 0777)
1621 r = btrfs_subvol_make_fd(pfd, basename(path));
1622 }
1623 } else
1624 r = 0;
1625
1626 if (!subvol || r == -ENOTTY)
1627 RUN_WITH_UMASK(0000)
1628 r = mkdirat_label(pfd, basename(path), mode);
1629
1630 if (r < 0) {
1631 int k;
1632
1633 if (!IN_SET(r, -EEXIST, -EROFS))
1634 return log_error_errno(r, "Failed to create directory or subvolume \"%s\": %m", path);
1635
1636 k = is_dir_fd(pfd);
1637 if (k == -ENOENT && r == -EROFS)
1638 return log_error_errno(r, "%s does not exist and cannot be created as the file system is read-only.", path);
1639 if (k < 0)
1640 return log_error_errno(k, "Failed to check if %s exists: %m", path);
1641 if (!k) {
1642 log_warning("\"%s\" already exists and is not a directory.", path);
1643 return -EEXIST;
1644 }
1645
1646 *creation = CREATION_EXISTING;
1647 } else
1648 *creation = CREATION_NORMAL;
1649
1650 log_debug("%s directory \"%s\".", creation_mode_verb_to_string(*creation), path);
1651
1652 r = openat(pfd, basename(path), O_NOCTTY|O_CLOEXEC|O_DIRECTORY);
1653 if (r < 0)
1654 return log_error_errno(errno, "Failed to open directory '%s': %m", basename(path));
1655
1656 return r;
1657 }
1658
1659 static int create_directory(Item *i, const char *path) {
1660 _cleanup_close_ int fd = -1;
1661
1662 assert(i);
1663 assert(IN_SET(i->type, CREATE_DIRECTORY, TRUNCATE_DIRECTORY));
1664
1665 fd = create_directory_or_subvolume(path, i->mode, false, NULL);
1666 if (fd == -EEXIST)
1667 return 0;
1668 if (fd < 0)
1669 return fd;
1670
1671 return fd_set_perms(i, fd, path, NULL);
1672 }
1673
1674 static int create_subvolume(Item *i, const char *path) {
1675 _cleanup_close_ int fd = -1;
1676 CreationMode creation;
1677 int r, q = 0;
1678
1679 assert(i);
1680 assert(IN_SET(i->type, CREATE_SUBVOLUME, CREATE_SUBVOLUME_NEW_QUOTA, CREATE_SUBVOLUME_INHERIT_QUOTA));
1681
1682 fd = create_directory_or_subvolume(path, i->mode, true, &creation);
1683 if (fd == -EEXIST)
1684 return 0;
1685 if (fd < 0)
1686 return fd;
1687
1688 if (creation == CREATION_NORMAL &&
1689 IN_SET(i->type, CREATE_SUBVOLUME_NEW_QUOTA, CREATE_SUBVOLUME_INHERIT_QUOTA)) {
1690 r = btrfs_subvol_auto_qgroup_fd(fd, 0, i->type == CREATE_SUBVOLUME_NEW_QUOTA);
1691 if (r == -ENOTTY)
1692 log_debug_errno(r, "Couldn't adjust quota for subvolume \"%s\" (unsupported fs or dir not a subvolume): %m", i->path);
1693 else if (r == -EROFS)
1694 log_debug_errno(r, "Couldn't adjust quota for subvolume \"%s\" (fs is read-only).", i->path);
1695 else if (r == -ENOTCONN)
1696 log_debug_errno(r, "Couldn't adjust quota for subvolume \"%s\" (quota support is disabled).", i->path);
1697 else if (r < 0)
1698 q = log_error_errno(r, "Failed to adjust quota for subvolume \"%s\": %m", i->path);
1699 else if (r > 0)
1700 log_debug("Adjusted quota for subvolume \"%s\".", i->path);
1701 else if (r == 0)
1702 log_debug("Quota for subvolume \"%s\" already in place, no change made.", i->path);
1703 }
1704
1705 r = fd_set_perms(i, fd, path, NULL);
1706 if (q < 0) /* prefer the quota change error from above */
1707 return q;
1708
1709 return r;
1710 }
1711
1712 static int empty_directory(Item *i, const char *path) {
1713 int r;
1714
1715 assert(i);
1716 assert(i->type == EMPTY_DIRECTORY);
1717
1718 r = is_dir(path, false);
1719 if (r == -ENOENT) {
1720 /* Option "e" operates only on existing objects. Do not
1721 * print errors about non-existent files or directories */
1722 log_debug("Skipping missing directory: %s", path);
1723 return 0;
1724 }
1725 if (r < 0)
1726 return log_error_errno(r, "is_dir() failed on path %s: %m", path);
1727 if (r == 0)
1728 return log_error_errno(SYNTHETIC_ERRNO(EEXIST),
1729 "'%s' already exists and is not a directory.",
1730 path);
1731
1732 return path_set_perms(i, path);
1733 }
1734
1735 static int create_device(Item *i, mode_t file_type) {
1736 _cleanup_close_ int dfd = -1, fd = -1;
1737 CreationMode creation;
1738 char *bn;
1739 int r;
1740
1741 assert(i);
1742 assert(IN_SET(file_type, S_IFBLK, S_IFCHR));
1743
1744 bn = basename(i->path);
1745
1746 /* Validate the path and use the returned directory fd for copying the
1747 * target so we're sure that the path can't be changed behind our
1748 * back. */
1749 dfd = path_open_parent_safe(i->path);
1750 if (dfd < 0)
1751 return dfd;
1752
1753 RUN_WITH_UMASK(0000) {
1754 mac_selinux_create_file_prepare(i->path, file_type);
1755 r = mknodat(dfd, bn, i->mode | file_type, i->major_minor);
1756 mac_selinux_create_file_clear();
1757 }
1758
1759 if (r < 0) {
1760 struct stat st;
1761
1762 if (errno == EPERM) {
1763 log_debug("We lack permissions, possibly because of cgroup configuration; "
1764 "skipping creation of device node %s.", i->path);
1765 return 0;
1766 }
1767
1768 if (errno != EEXIST)
1769 return log_error_errno(errno, "Failed to create device node %s: %m", i->path);
1770
1771 if (fstatat(dfd, bn, &st, 0) < 0)
1772 return log_error_errno(errno, "stat(%s) failed: %m", i->path);
1773
1774 if ((st.st_mode & S_IFMT) != file_type) {
1775
1776 if (i->append_or_force) {
1777
1778 RUN_WITH_UMASK(0000) {
1779 mac_selinux_create_file_prepare(i->path, file_type);
1780 /* FIXME: need to introduce mknodat_atomic() */
1781 r = mknod_atomic(i->path, i->mode | file_type, i->major_minor);
1782 mac_selinux_create_file_clear();
1783 }
1784
1785 if (r < 0)
1786 return log_error_errno(r, "Failed to create device node \"%s\": %m", i->path);
1787 creation = CREATION_FORCE;
1788 } else {
1789 log_debug("%s is not a device node.", i->path);
1790 return 0;
1791 }
1792 } else
1793 creation = CREATION_EXISTING;
1794 } else
1795 creation = CREATION_NORMAL;
1796
1797 log_debug("%s %s device node \"%s\" %u:%u.",
1798 creation_mode_verb_to_string(creation),
1799 i->type == CREATE_BLOCK_DEVICE ? "block" : "char",
1800 i->path, major(i->mode), minor(i->mode));
1801
1802 fd = openat(dfd, bn, O_NOFOLLOW|O_CLOEXEC|O_PATH);
1803 if (fd < 0)
1804 return log_error_errno(errno, "Failed to openat(%s): %m", i->path);
1805
1806 return fd_set_perms(i, fd, i->path, NULL);
1807 }
1808
1809 static int create_fifo(Item *i, const char *path) {
1810 _cleanup_close_ int pfd = -1, fd = -1;
1811 CreationMode creation;
1812 struct stat st;
1813 char *bn;
1814 int r;
1815
1816 pfd = path_open_parent_safe(path);
1817 if (pfd < 0)
1818 return pfd;
1819
1820 bn = basename(path);
1821
1822 RUN_WITH_UMASK(0000) {
1823 mac_selinux_create_file_prepare(path, S_IFIFO);
1824 r = mkfifoat(pfd, bn, i->mode);
1825 mac_selinux_create_file_clear();
1826 }
1827
1828 if (r < 0) {
1829 if (errno != EEXIST)
1830 return log_error_errno(errno, "Failed to create fifo %s: %m", path);
1831
1832 if (fstatat(pfd, bn, &st, AT_SYMLINK_NOFOLLOW) < 0)
1833 return log_error_errno(errno, "stat(%s) failed: %m", path);
1834
1835 if (!S_ISFIFO(st.st_mode)) {
1836
1837 if (i->append_or_force) {
1838 RUN_WITH_UMASK(0000) {
1839 mac_selinux_create_file_prepare(path, S_IFIFO);
1840 r = mkfifoat_atomic(pfd, bn, i->mode);
1841 mac_selinux_create_file_clear();
1842 }
1843
1844 if (r < 0)
1845 return log_error_errno(r, "Failed to create fifo %s: %m", path);
1846 creation = CREATION_FORCE;
1847 } else {
1848 log_warning("\"%s\" already exists and is not a fifo.", path);
1849 return 0;
1850 }
1851 } else
1852 creation = CREATION_EXISTING;
1853 } else
1854 creation = CREATION_NORMAL;
1855
1856 log_debug("%s fifo \"%s\".", creation_mode_verb_to_string(creation), path);
1857
1858 fd = openat(pfd, bn, O_NOFOLLOW|O_CLOEXEC|O_PATH);
1859 if (fd < 0)
1860 return log_error_errno(errno, "Failed to openat(%s): %m", path);
1861
1862 return fd_set_perms(i, fd, i->path, NULL);
1863 }
1864
1865 typedef int (*action_t)(Item *i, const char *path);
1866 typedef int (*fdaction_t)(Item *i, int fd, const char *path, const struct stat *st);
1867
1868 static int item_do(Item *i, int fd, const char *path, fdaction_t action) {
1869 struct stat st;
1870 int r = 0, q;
1871
1872 assert(i);
1873 assert(path);
1874 assert(fd >= 0);
1875
1876 if (fstat(fd, &st) < 0) {
1877 r = log_error_errno(errno, "fstat() on file failed: %m");
1878 goto finish;
1879 }
1880
1881 /* This returns the first error we run into, but nevertheless
1882 * tries to go on */
1883 r = action(i, fd, path, &st);
1884
1885 if (S_ISDIR(st.st_mode)) {
1886 char procfs_path[STRLEN("/proc/self/fd/") + DECIMAL_STR_MAX(int)];
1887 _cleanup_closedir_ DIR *d = NULL;
1888 struct dirent *de;
1889
1890 /* The passed 'fd' was opened with O_PATH. We need to convert
1891 * it into a 'regular' fd before reading the directory content. */
1892 xsprintf(procfs_path, "/proc/self/fd/%i", fd);
1893
1894 d = opendir(procfs_path);
1895 if (!d) {
1896 log_error_errno(errno, "Failed to opendir() '%s': %m", procfs_path);
1897 if (r == 0)
1898 r = -errno;
1899 goto finish;
1900 }
1901
1902 FOREACH_DIRENT_ALL(de, d, q = -errno; goto finish) {
1903 int de_fd;
1904
1905 if (dot_or_dot_dot(de->d_name))
1906 continue;
1907
1908 de_fd = openat(fd, de->d_name, O_NOFOLLOW|O_CLOEXEC|O_PATH);
1909 if (de_fd < 0)
1910 q = log_error_errno(errno, "Failed to open() file '%s': %m", de->d_name);
1911 else {
1912 _cleanup_free_ char *de_path = NULL;
1913
1914 de_path = path_join(path, de->d_name);
1915 if (!de_path)
1916 q = log_oom();
1917 else
1918 /* Pass ownership of dirent fd over */
1919 q = item_do(i, de_fd, de_path, action);
1920 }
1921
1922 if (q < 0 && r == 0)
1923 r = q;
1924 }
1925 }
1926 finish:
1927 safe_close(fd);
1928 return r;
1929 }
1930
1931 static int glob_item(Item *i, action_t action) {
1932 _cleanup_globfree_ glob_t g = {
1933 .gl_opendir = (void *(*)(const char *)) opendir_nomod,
1934 };
1935 int r = 0, k;
1936 char **fn;
1937
1938 k = safe_glob(i->path, GLOB_NOSORT|GLOB_BRACE, &g);
1939 if (k < 0 && k != -ENOENT)
1940 return log_error_errno(k, "glob(%s) failed: %m", i->path);
1941
1942 STRV_FOREACH(fn, g.gl_pathv) {
1943 k = action(i, *fn);
1944 if (k < 0 && r == 0)
1945 r = k;
1946 }
1947
1948 return r;
1949 }
1950
1951 static int glob_item_recursively(Item *i, fdaction_t action) {
1952 _cleanup_globfree_ glob_t g = {
1953 .gl_opendir = (void *(*)(const char *)) opendir_nomod,
1954 };
1955 int r = 0, k;
1956 char **fn;
1957
1958 k = safe_glob(i->path, GLOB_NOSORT|GLOB_BRACE, &g);
1959 if (k < 0 && k != -ENOENT)
1960 return log_error_errno(k, "glob(%s) failed: %m", i->path);
1961
1962 STRV_FOREACH(fn, g.gl_pathv) {
1963 _cleanup_close_ int fd = -1;
1964
1965 /* Make sure we won't trigger/follow file object (such as
1966 * device nodes, automounts, ...) pointed out by 'fn' with
1967 * O_PATH. Note, when O_PATH is used, flags other than
1968 * O_CLOEXEC, O_DIRECTORY, and O_NOFOLLOW are ignored. */
1969
1970 fd = open(*fn, O_CLOEXEC|O_NOFOLLOW|O_PATH);
1971 if (fd < 0) {
1972 log_error_errno(errno, "Opening '%s' failed: %m", *fn);
1973 if (r == 0)
1974 r = -errno;
1975 continue;
1976 }
1977
1978 k = item_do(i, fd, *fn, action);
1979 if (k < 0 && r == 0)
1980 r = k;
1981
1982 /* we passed fd ownership to the previous call */
1983 fd = -1;
1984 }
1985
1986 return r;
1987 }
1988
1989 static int create_item(Item *i) {
1990 CreationMode creation;
1991 int r = 0;
1992
1993 assert(i);
1994
1995 log_debug("Running create action for entry %c %s", (char) i->type, i->path);
1996
1997 switch (i->type) {
1998
1999 case IGNORE_PATH:
2000 case IGNORE_DIRECTORY_PATH:
2001 case REMOVE_PATH:
2002 case RECURSIVE_REMOVE_PATH:
2003 return 0;
2004
2005 case TRUNCATE_FILE:
2006 case CREATE_FILE:
2007 RUN_WITH_UMASK(0000)
2008 (void) mkdir_parents_label(i->path, 0755);
2009
2010 if ((i->type == CREATE_FILE && i->append_or_force) || i->type == TRUNCATE_FILE)
2011 r = truncate_file(i, i->path);
2012 else
2013 r = create_file(i, i->path);
2014
2015 if (r < 0)
2016 return r;
2017 break;
2018
2019 case COPY_FILES:
2020 RUN_WITH_UMASK(0000)
2021 (void) mkdir_parents_label(i->path, 0755);
2022
2023 r = copy_files(i);
2024 if (r < 0)
2025 return r;
2026 break;
2027
2028 case WRITE_FILE:
2029 r = glob_item(i, write_one_file);
2030 if (r < 0)
2031 return r;
2032
2033 break;
2034
2035 case CREATE_DIRECTORY:
2036 case TRUNCATE_DIRECTORY:
2037 RUN_WITH_UMASK(0000)
2038 (void) mkdir_parents_label(i->path, 0755);
2039
2040 r = create_directory(i, i->path);
2041 if (r < 0)
2042 return r;
2043 break;
2044
2045 case CREATE_SUBVOLUME:
2046 case CREATE_SUBVOLUME_INHERIT_QUOTA:
2047 case CREATE_SUBVOLUME_NEW_QUOTA:
2048 RUN_WITH_UMASK(0000)
2049 (void) mkdir_parents_label(i->path, 0755);
2050
2051 r = create_subvolume(i, i->path);
2052 if (r < 0)
2053 return r;
2054 break;
2055
2056 case EMPTY_DIRECTORY:
2057 r = glob_item(i, empty_directory);
2058 if (r < 0)
2059 return r;
2060 break;
2061
2062 case CREATE_FIFO:
2063 RUN_WITH_UMASK(0000)
2064 (void) mkdir_parents_label(i->path, 0755);
2065
2066 r = create_fifo(i, i->path);
2067 if (r < 0)
2068 return r;
2069 break;
2070
2071 case CREATE_SYMLINK: {
2072 RUN_WITH_UMASK(0000)
2073 (void) mkdir_parents_label(i->path, 0755);
2074
2075 mac_selinux_create_file_prepare(i->path, S_IFLNK);
2076 r = symlink(i->argument, i->path);
2077 mac_selinux_create_file_clear();
2078
2079 if (r < 0) {
2080 _cleanup_free_ char *x = NULL;
2081
2082 if (errno != EEXIST)
2083 return log_error_errno(errno, "symlink(%s, %s) failed: %m", i->argument, i->path);
2084
2085 r = readlink_malloc(i->path, &x);
2086 if (r < 0 || !streq(i->argument, x)) {
2087
2088 if (i->append_or_force) {
2089 mac_selinux_create_file_prepare(i->path, S_IFLNK);
2090 r = symlink_atomic(i->argument, i->path);
2091 mac_selinux_create_file_clear();
2092
2093 if (IN_SET(r, -EISDIR, -EEXIST, -ENOTEMPTY)) {
2094 r = rm_rf(i->path, REMOVE_ROOT|REMOVE_PHYSICAL);
2095 if (r < 0)
2096 return log_error_errno(r, "rm -fr %s failed: %m", i->path);
2097
2098 mac_selinux_create_file_prepare(i->path, S_IFLNK);
2099 r = symlink(i->argument, i->path) < 0 ? -errno : 0;
2100 mac_selinux_create_file_clear();
2101 }
2102 if (r < 0)
2103 return log_error_errno(r, "symlink(%s, %s) failed: %m", i->argument, i->path);
2104
2105 creation = CREATION_FORCE;
2106 } else {
2107 log_debug("\"%s\" is not a symlink or does not point to the correct path.", i->path);
2108 return 0;
2109 }
2110 } else
2111 creation = CREATION_EXISTING;
2112 } else
2113
2114 creation = CREATION_NORMAL;
2115 log_debug("%s symlink \"%s\".", creation_mode_verb_to_string(creation), i->path);
2116 break;
2117 }
2118
2119 case CREATE_BLOCK_DEVICE:
2120 case CREATE_CHAR_DEVICE:
2121 if (have_effective_cap(CAP_MKNOD) == 0) {
2122 /* In a container we lack CAP_MKNOD. We shouldn't attempt to create the device node in that
2123 * case to avoid noise, and we don't support virtualized devices in containers anyway. */
2124
2125 log_debug("We lack CAP_MKNOD, skipping creation of device node %s.", i->path);
2126 return 0;
2127 }
2128
2129 RUN_WITH_UMASK(0000)
2130 (void) mkdir_parents_label(i->path, 0755);
2131
2132 r = create_device(i, i->type == CREATE_BLOCK_DEVICE ? S_IFBLK : S_IFCHR);
2133 if (r < 0)
2134 return r;
2135
2136 break;
2137
2138 case ADJUST_MODE:
2139 case RELABEL_PATH:
2140 r = glob_item(i, path_set_perms);
2141 if (r < 0)
2142 return r;
2143 break;
2144
2145 case RECURSIVE_RELABEL_PATH:
2146 r = glob_item_recursively(i, fd_set_perms);
2147 if (r < 0)
2148 return r;
2149 break;
2150
2151 case SET_XATTR:
2152 r = glob_item(i, path_set_xattrs);
2153 if (r < 0)
2154 return r;
2155 break;
2156
2157 case RECURSIVE_SET_XATTR:
2158 r = glob_item_recursively(i, fd_set_xattrs);
2159 if (r < 0)
2160 return r;
2161 break;
2162
2163 case SET_ACL:
2164 r = glob_item(i, path_set_acls);
2165 if (r < 0)
2166 return r;
2167 break;
2168
2169 case RECURSIVE_SET_ACL:
2170 r = glob_item_recursively(i, fd_set_acls);
2171 if (r < 0)
2172 return r;
2173 break;
2174
2175 case SET_ATTRIBUTE:
2176 r = glob_item(i, path_set_attribute);
2177 if (r < 0)
2178 return r;
2179 break;
2180
2181 case RECURSIVE_SET_ATTRIBUTE:
2182 r = glob_item_recursively(i, fd_set_attribute);
2183 if (r < 0)
2184 return r;
2185 break;
2186 }
2187
2188 return 0;
2189 }
2190
2191 static int remove_item_instance(Item *i, const char *instance) {
2192 int r;
2193
2194 assert(i);
2195
2196 switch (i->type) {
2197
2198 case REMOVE_PATH:
2199 if (remove(instance) < 0 && errno != ENOENT)
2200 return log_error_errno(errno, "rm(%s): %m", instance);
2201
2202 break;
2203
2204 case RECURSIVE_REMOVE_PATH:
2205 /* FIXME: we probably should use dir_cleanup() here instead of rm_rf() so that 'x' is honoured. */
2206 log_debug("rm -rf \"%s\"", instance);
2207 r = rm_rf(instance, REMOVE_ROOT|REMOVE_SUBVOLUME|REMOVE_PHYSICAL);
2208 if (r < 0 && r != -ENOENT)
2209 return log_error_errno(r, "rm_rf(%s): %m", instance);
2210
2211 break;
2212
2213 default:
2214 assert_not_reached("wut?");
2215 }
2216
2217 return 0;
2218 }
2219
2220 static int remove_item(Item *i) {
2221 int r;
2222
2223 assert(i);
2224
2225 log_debug("Running remove action for entry %c %s", (char) i->type, i->path);
2226
2227 switch (i->type) {
2228
2229 case TRUNCATE_DIRECTORY:
2230 /* FIXME: we probably should use dir_cleanup() here instead of rm_rf() so that 'x' is honoured. */
2231 log_debug("rm -rf \"%s\"", i->path);
2232 r = rm_rf(i->path, REMOVE_PHYSICAL);
2233 if (r < 0 && r != -ENOENT)
2234 return log_error_errno(r, "rm_rf(%s): %m", i->path);
2235
2236 return 0;
2237
2238 case REMOVE_PATH:
2239 case RECURSIVE_REMOVE_PATH:
2240 return glob_item(i, remove_item_instance);
2241
2242 default:
2243 return 0;
2244 }
2245 }
2246
2247 static int clean_item_instance(Item *i, const char* instance) {
2248 char timestamp[FORMAT_TIMESTAMP_MAX];
2249 _cleanup_closedir_ DIR *d = NULL;
2250 STRUCT_STATX_DEFINE(sx);
2251 int mountpoint, r;
2252 usec_t cutoff, n;
2253
2254 assert(i);
2255
2256 if (!i->age_set)
2257 return 0;
2258
2259 n = now(CLOCK_REALTIME);
2260 if (n < i->age)
2261 return 0;
2262
2263 cutoff = n - i->age;
2264
2265 d = opendir_nomod(instance);
2266 if (!d) {
2267 if (IN_SET(errno, ENOENT, ENOTDIR)) {
2268 log_debug_errno(errno, "Directory \"%s\": %m", instance);
2269 return 0;
2270 }
2271
2272 return log_error_errno(errno, "Failed to open directory %s: %m", instance);
2273 }
2274
2275 r = statx_fallback(dirfd(d), "", AT_EMPTY_PATH, STATX_MODE|STATX_INO|STATX_ATIME|STATX_MTIME, &sx);
2276 if (r < 0)
2277 return log_error_errno(r, "statx(%s) failed: %m", instance);
2278
2279 if (FLAGS_SET(sx.stx_attributes_mask, STATX_ATTR_MOUNT_ROOT))
2280 mountpoint = FLAGS_SET(sx.stx_attributes, STATX_ATTR_MOUNT_ROOT);
2281 else {
2282 struct stat ps;
2283
2284 if (fstatat(dirfd(d), "..", &ps, AT_SYMLINK_NOFOLLOW) != 0)
2285 return log_error_errno(errno, "stat(%s/..) failed: %m", i->path);
2286
2287 mountpoint =
2288 sx.stx_dev_major != major(ps.st_dev) ||
2289 sx.stx_dev_minor != minor(ps.st_dev) ||
2290 sx.stx_ino != ps.st_ino;
2291 }
2292
2293 log_debug("Cleanup threshold for %s \"%s\" is %s",
2294 mountpoint ? "mount point" : "directory",
2295 instance,
2296 format_timestamp_style(timestamp, sizeof(timestamp), cutoff, TIMESTAMP_US));
2297
2298 return dir_cleanup(i, instance, d,
2299 load_statx_timestamp_nsec(&sx.stx_atime),
2300 load_statx_timestamp_nsec(&sx.stx_mtime),
2301 cutoff * NSEC_PER_USEC,
2302 sx.stx_dev_major, sx.stx_dev_minor, mountpoint,
2303 MAX_DEPTH, i->keep_first_level);
2304 }
2305
2306 static int clean_item(Item *i) {
2307 assert(i);
2308
2309 log_debug("Running clean action for entry %c %s", (char) i->type, i->path);
2310
2311 switch (i->type) {
2312 case CREATE_DIRECTORY:
2313 case CREATE_SUBVOLUME:
2314 case CREATE_SUBVOLUME_INHERIT_QUOTA:
2315 case CREATE_SUBVOLUME_NEW_QUOTA:
2316 case TRUNCATE_DIRECTORY:
2317 case IGNORE_PATH:
2318 case COPY_FILES:
2319 clean_item_instance(i, i->path);
2320 return 0;
2321 case EMPTY_DIRECTORY:
2322 case IGNORE_DIRECTORY_PATH:
2323 return glob_item(i, clean_item_instance);
2324 default:
2325 return 0;
2326 }
2327 }
2328
2329 static int process_item(Item *i, OperationMask operation) {
2330 OperationMask todo;
2331 int r, q, p;
2332
2333 assert(i);
2334
2335 todo = operation & ~i->done;
2336 if (todo == 0) /* Everything already done? */
2337 return 0;
2338
2339 i->done |= operation;
2340
2341 r = chase_symlinks(i->path, arg_root, CHASE_NO_AUTOFS|CHASE_WARN, NULL, NULL);
2342 if (r == -EREMOTE) {
2343 log_notice_errno(r, "Skipping %s", i->path);
2344 return 0;
2345 }
2346 if (r < 0)
2347 log_debug_errno(r, "Failed to determine whether '%s' is below autofs, ignoring: %m", i->path);
2348
2349 r = FLAGS_SET(operation, OPERATION_CREATE) ? create_item(i) : 0;
2350 /* Failure can only be tolerated for create */
2351 if (i->allow_failure)
2352 r = 0;
2353
2354 q = FLAGS_SET(operation, OPERATION_REMOVE) ? remove_item(i) : 0;
2355 p = FLAGS_SET(operation, OPERATION_CLEAN) ? clean_item(i) : 0;
2356
2357 return r < 0 ? r :
2358 q < 0 ? q :
2359 p;
2360 }
2361
2362 static int process_item_array(ItemArray *array, OperationMask operation) {
2363 int r = 0;
2364 size_t n;
2365
2366 assert(array);
2367
2368 /* Create any parent first. */
2369 if (FLAGS_SET(operation, OPERATION_CREATE) && array->parent)
2370 r = process_item_array(array->parent, operation & OPERATION_CREATE);
2371
2372 /* Clean up all children first */
2373 if ((operation & (OPERATION_REMOVE|OPERATION_CLEAN)) && !set_isempty(array->children)) {
2374 ItemArray *c;
2375
2376 SET_FOREACH(c, array->children) {
2377 int k;
2378
2379 k = process_item_array(c, operation & (OPERATION_REMOVE|OPERATION_CLEAN));
2380 if (k < 0 && r == 0)
2381 r = k;
2382 }
2383 }
2384
2385 for (n = 0; n < array->n_items; n++) {
2386 int k;
2387
2388 k = process_item(array->items + n, operation);
2389 if (k < 0 && r == 0)
2390 r = k;
2391 }
2392
2393 return r;
2394 }
2395
2396 static void item_free_contents(Item *i) {
2397 assert(i);
2398 free(i->path);
2399 free(i->argument);
2400 strv_free(i->xattrs);
2401
2402 #if HAVE_ACL
2403 acl_free(i->acl_access);
2404 acl_free(i->acl_default);
2405 #endif
2406 }
2407
2408 static ItemArray* item_array_free(ItemArray *a) {
2409 size_t n;
2410
2411 if (!a)
2412 return NULL;
2413
2414 for (n = 0; n < a->n_items; n++)
2415 item_free_contents(a->items + n);
2416
2417 set_free(a->children);
2418 free(a->items);
2419 return mfree(a);
2420 }
2421
2422 static int item_compare(const Item *a, const Item *b) {
2423 /* Make sure that the ownership taking item is put first, so
2424 * that we first create the node, and then can adjust it */
2425
2426 if (takes_ownership(a->type) && !takes_ownership(b->type))
2427 return -1;
2428 if (!takes_ownership(a->type) && takes_ownership(b->type))
2429 return 1;
2430
2431 return CMP(a->type, b->type);
2432 }
2433
2434 static bool item_compatible(Item *a, Item *b) {
2435 assert(a);
2436 assert(b);
2437 assert(streq(a->path, b->path));
2438
2439 if (takes_ownership(a->type) && takes_ownership(b->type))
2440 /* check if the items are the same */
2441 return streq_ptr(a->argument, b->argument) &&
2442
2443 a->uid_set == b->uid_set &&
2444 a->uid == b->uid &&
2445
2446 a->gid_set == b->gid_set &&
2447 a->gid == b->gid &&
2448
2449 a->mode_set == b->mode_set &&
2450 a->mode == b->mode &&
2451
2452 a->age_set == b->age_set &&
2453 a->age == b->age &&
2454
2455 a->mask_perms == b->mask_perms &&
2456
2457 a->keep_first_level == b->keep_first_level &&
2458
2459 a->major_minor == b->major_minor;
2460
2461 return true;
2462 }
2463
2464 static bool should_include_path(const char *path) {
2465 char **prefix;
2466
2467 STRV_FOREACH(prefix, arg_exclude_prefixes)
2468 if (path_startswith(path, *prefix)) {
2469 log_debug("Entry \"%s\" matches exclude prefix \"%s\", skipping.",
2470 path, *prefix);
2471 return false;
2472 }
2473
2474 STRV_FOREACH(prefix, arg_include_prefixes)
2475 if (path_startswith(path, *prefix)) {
2476 log_debug("Entry \"%s\" matches include prefix \"%s\".", path, *prefix);
2477 return true;
2478 }
2479
2480 /* no matches, so we should include this path only if we have no allow list at all */
2481 if (strv_isempty(arg_include_prefixes))
2482 return true;
2483
2484 log_debug("Entry \"%s\" does not match any include prefix, skipping.", path);
2485 return false;
2486 }
2487
2488 static int specifier_expansion_from_arg(Item *i) {
2489 _cleanup_free_ char *unescaped = NULL, *resolved = NULL;
2490 char **xattr;
2491 int r;
2492
2493 assert(i);
2494
2495 if (!i->argument)
2496 return 0;
2497
2498 switch (i->type) {
2499 case COPY_FILES:
2500 case CREATE_SYMLINK:
2501 case CREATE_FILE:
2502 case TRUNCATE_FILE:
2503 case WRITE_FILE:
2504 r = cunescape(i->argument, 0, &unescaped);
2505 if (r < 0)
2506 return log_error_errno(r, "Failed to unescape parameter to write: %s", i->argument);
2507
2508 r = specifier_printf(unescaped, specifier_table, NULL, &resolved);
2509 if (r < 0)
2510 return r;
2511
2512 free_and_replace(i->argument, resolved);
2513 break;
2514
2515 case SET_XATTR:
2516 case RECURSIVE_SET_XATTR:
2517 STRV_FOREACH(xattr, i->xattrs) {
2518 r = specifier_printf(*xattr, specifier_table, NULL, &resolved);
2519 if (r < 0)
2520 return r;
2521
2522 free_and_replace(*xattr, resolved);
2523 }
2524 break;
2525
2526 default:
2527 break;
2528 }
2529 return 0;
2530 }
2531
2532 static int patch_var_run(const char *fname, unsigned line, char **path) {
2533 const char *k;
2534 char *n;
2535
2536 assert(path);
2537 assert(*path);
2538
2539 /* Optionally rewrites lines referencing /var/run/, to use /run/ instead. Why bother? tmpfiles merges lines in
2540 * some cases and detects conflicts in others. If files/directories are specified through two equivalent lines
2541 * this is problematic as neither case will be detected. Ideally we'd detect these cases by resolving symlinks
2542 * early, but that's precisely not what we can do here as this code very likely is running very early on, at a
2543 * time where the paths in question are not available yet, or even more importantly, our own tmpfiles rules
2544 * might create the paths that are intermediary to the listed paths. We can't really cover the generic case,
2545 * but the least we can do is cover the specific case of /var/run vs. /run, as /var/run is a legacy name for
2546 * /run only, and we explicitly document that and require that on systemd systems the former is a symlink to
2547 * the latter. Moreover files below this path are by far the primary usecase for tmpfiles.d/. */
2548
2549 k = path_startswith(*path, "/var/run/");
2550 if (isempty(k)) /* Don't complain about other paths than /var/run, and not about /var/run itself either. */
2551 return 0;
2552
2553 n = path_join("/run", k);
2554 if (!n)
2555 return log_oom();
2556
2557 /* Also log about this briefly. We do so at LOG_NOTICE level, as we fixed up the situation automatically, hence
2558 * there's no immediate need for action by the user. However, in the interest of making things less confusing
2559 * to the user, let's still inform the user that these snippets should really be updated. */
2560 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);
2561
2562 free_and_replace(*path, n);
2563
2564 return 0;
2565 }
2566
2567 static int find_uid(const char *user, uid_t *ret_uid, Hashmap **cache) {
2568 int r;
2569
2570 assert(user);
2571 assert(ret_uid);
2572
2573 /* First: parse as numeric UID string */
2574 r = parse_uid(user, ret_uid);
2575 if (r >= 0)
2576 return r;
2577
2578 /* Second: pass to NSS if we are running "online" */
2579 if (!arg_root)
2580 return get_user_creds(&user, ret_uid, NULL, NULL, NULL, 0);
2581
2582 /* Third, synthesize "root" unconditionally */
2583 if (streq(user, "root")) {
2584 *ret_uid = 0;
2585 return 0;
2586 }
2587
2588 /* Fourth: use fgetpwent() to read /etc/passwd directly, if we are "offline" */
2589 return name_to_uid_offline(arg_root, user, ret_uid, cache);
2590 }
2591
2592 static int find_gid(const char *group, gid_t *ret_gid, Hashmap **cache) {
2593 int r;
2594
2595 assert(group);
2596 assert(ret_gid);
2597
2598 /* First: parse as numeric GID string */
2599 r = parse_gid(group, ret_gid);
2600 if (r >= 0)
2601 return r;
2602
2603 /* Second: pass to NSS if we are running "online" */
2604 if (!arg_root)
2605 return get_group_creds(&group, ret_gid, 0);
2606
2607 /* Third, synthesize "root" unconditionally */
2608 if (streq(group, "root")) {
2609 *ret_gid = 0;
2610 return 0;
2611 }
2612
2613 /* Fourth: use fgetgrent() to read /etc/group directly, if we are "offline" */
2614 return name_to_gid_offline(arg_root, group, ret_gid, cache);
2615 }
2616
2617 static int parse_line(
2618 const char *fname,
2619 unsigned line,
2620 const char *buffer,
2621 bool *invalid_config,
2622 Hashmap **uid_cache,
2623 Hashmap **gid_cache) {
2624
2625 _cleanup_free_ char *action = NULL, *mode = NULL, *user = NULL, *group = NULL, *age = NULL, *path = NULL;
2626 _cleanup_(item_free_contents) Item i = {};
2627 ItemArray *existing;
2628 OrderedHashmap *h;
2629 int r, pos;
2630 bool append_or_force = false, boot = false, allow_failure = false;
2631
2632 assert(fname);
2633 assert(line >= 1);
2634 assert(buffer);
2635
2636 r = extract_many_words(
2637 &buffer,
2638 NULL,
2639 EXTRACT_UNQUOTE,
2640 &action,
2641 &path,
2642 &mode,
2643 &user,
2644 &group,
2645 &age,
2646 NULL);
2647 if (r < 0) {
2648 if (IN_SET(r, -EINVAL, -EBADSLT))
2649 /* invalid quoting and such or an unknown specifier */
2650 *invalid_config = true;
2651 return log_syntax(NULL, LOG_ERR, fname, line, r, "Failed to parse line: %m");
2652 } else if (r < 2) {
2653 *invalid_config = true;
2654 return log_syntax(NULL, LOG_ERR, fname, line, SYNTHETIC_ERRNO(EBADMSG), "Syntax error.");
2655 }
2656
2657 if (!empty_or_dash(buffer)) {
2658 i.argument = strdup(buffer);
2659 if (!i.argument)
2660 return log_oom();
2661 }
2662
2663 if (isempty(action)) {
2664 *invalid_config = true;
2665 return log_syntax(NULL, LOG_ERR, fname, line, SYNTHETIC_ERRNO(EBADMSG), "Command too short '%s'.", action);
2666 }
2667
2668 for (pos = 1; action[pos]; pos++) {
2669 if (action[pos] == '!' && !boot)
2670 boot = true;
2671 else if (action[pos] == '+' && !append_or_force)
2672 append_or_force = true;
2673 else if (action[pos] == '-' && !allow_failure)
2674 allow_failure = true;
2675 else {
2676 *invalid_config = true;
2677 return log_syntax(NULL, LOG_ERR, fname, line, SYNTHETIC_ERRNO(EBADMSG), "Unknown modifiers in command '%s'", action);
2678 }
2679 }
2680
2681 if (boot && !arg_boot) {
2682 log_syntax(NULL, LOG_DEBUG, fname, line, 0, "Ignoring entry %s \"%s\" because --boot is not specified.", action, path);
2683 return 0;
2684 }
2685
2686 i.type = action[0];
2687 i.append_or_force = append_or_force;
2688 i.allow_failure = allow_failure;
2689
2690 r = specifier_printf(path, specifier_table, NULL, &i.path);
2691 if (r == -ENXIO)
2692 return log_unresolvable_specifier(fname, line);
2693 if (r < 0) {
2694 if (IN_SET(r, -EINVAL, -EBADSLT))
2695 *invalid_config = true;
2696 return log_syntax(NULL, LOG_ERR, fname, line, r, "Failed to replace specifiers in '%s': %m", path);
2697 }
2698
2699 r = patch_var_run(fname, line, &i.path);
2700 if (r < 0)
2701 return r;
2702
2703 switch (i.type) {
2704
2705 case CREATE_DIRECTORY:
2706 case CREATE_SUBVOLUME:
2707 case CREATE_SUBVOLUME_INHERIT_QUOTA:
2708 case CREATE_SUBVOLUME_NEW_QUOTA:
2709 case EMPTY_DIRECTORY:
2710 case TRUNCATE_DIRECTORY:
2711 case CREATE_FIFO:
2712 case IGNORE_PATH:
2713 case IGNORE_DIRECTORY_PATH:
2714 case REMOVE_PATH:
2715 case RECURSIVE_REMOVE_PATH:
2716 case ADJUST_MODE:
2717 case RELABEL_PATH:
2718 case RECURSIVE_RELABEL_PATH:
2719 if (i.argument)
2720 log_syntax(NULL, LOG_WARNING, fname, line, 0, "%c lines don't take argument fields, ignoring.", i.type);
2721
2722 break;
2723
2724 case CREATE_FILE:
2725 case TRUNCATE_FILE:
2726 break;
2727
2728 case CREATE_SYMLINK:
2729 if (!i.argument) {
2730 i.argument = path_join("/usr/share/factory", i.path);
2731 if (!i.argument)
2732 return log_oom();
2733 }
2734 break;
2735
2736 case WRITE_FILE:
2737 if (!i.argument) {
2738 *invalid_config = true;
2739 return log_syntax(NULL, LOG_ERR, fname, line, SYNTHETIC_ERRNO(EBADMSG), "Write file requires argument.");
2740 }
2741 break;
2742
2743 case COPY_FILES:
2744 if (!i.argument) {
2745 i.argument = path_join("/usr/share/factory", i.path);
2746 if (!i.argument)
2747 return log_oom();
2748
2749 } else if (!path_is_absolute(i.argument)) {
2750 *invalid_config = true;
2751 return log_syntax(NULL, LOG_ERR, fname, line, SYNTHETIC_ERRNO(EBADMSG), "Source path '%s' is not absolute.", i.argument);
2752
2753 }
2754
2755 if (!empty_or_root(arg_root)) {
2756 char *p;
2757
2758 p = path_join(arg_root, i.argument);
2759 if (!p)
2760 return log_oom();
2761 free_and_replace(i.argument, p);
2762 }
2763
2764 path_simplify(i.argument, false);
2765 break;
2766
2767 case CREATE_CHAR_DEVICE:
2768 case CREATE_BLOCK_DEVICE:
2769 if (!i.argument) {
2770 *invalid_config = true;
2771 return log_syntax(NULL, LOG_ERR, fname, line, SYNTHETIC_ERRNO(EBADMSG), "Device file requires argument.");
2772 }
2773
2774 r = parse_dev(i.argument, &i.major_minor);
2775 if (r < 0) {
2776 *invalid_config = true;
2777 return log_syntax(NULL, LOG_ERR, fname, line, r, "Can't parse device file major/minor '%s'.", i.argument);
2778 }
2779
2780 break;
2781
2782 case SET_XATTR:
2783 case RECURSIVE_SET_XATTR:
2784 if (!i.argument) {
2785 *invalid_config = true;
2786 return log_syntax(NULL, LOG_ERR, fname, line, SYNTHETIC_ERRNO(EBADMSG),
2787 "Set extended attribute requires argument.");
2788 }
2789 r = parse_xattrs_from_arg(&i);
2790 if (r < 0)
2791 return r;
2792 break;
2793
2794 case SET_ACL:
2795 case RECURSIVE_SET_ACL:
2796 if (!i.argument) {
2797 *invalid_config = true;
2798 return log_syntax(NULL, LOG_ERR, fname, line, SYNTHETIC_ERRNO(EBADMSG),
2799 "Set ACLs requires argument.");
2800 }
2801 r = parse_acls_from_arg(&i);
2802 if (r < 0)
2803 return r;
2804 break;
2805
2806 case SET_ATTRIBUTE:
2807 case RECURSIVE_SET_ATTRIBUTE:
2808 if (!i.argument) {
2809 *invalid_config = true;
2810 return log_syntax(NULL, LOG_ERR, fname, line, SYNTHETIC_ERRNO(EBADMSG),
2811 "Set file attribute requires argument.");
2812 }
2813 r = parse_attribute_from_arg(&i);
2814 if (IN_SET(r, -EINVAL, -EBADSLT))
2815 *invalid_config = true;
2816 if (r < 0)
2817 return r;
2818 break;
2819
2820 default:
2821 *invalid_config = true;
2822 return log_syntax(NULL, LOG_ERR, fname, line, SYNTHETIC_ERRNO(EBADMSG),
2823 "Unknown command type '%c'.", (char) i.type);
2824 }
2825
2826 if (!path_is_absolute(i.path)) {
2827 *invalid_config = true;
2828 return log_syntax(NULL, LOG_ERR, fname, line, SYNTHETIC_ERRNO(EBADMSG),
2829 "Path '%s' not absolute.", i.path);
2830 }
2831
2832 path_simplify(i.path, false);
2833
2834 if (!should_include_path(i.path))
2835 return 0;
2836
2837 r = specifier_expansion_from_arg(&i);
2838 if (r == -ENXIO)
2839 return log_unresolvable_specifier(fname, line);
2840 if (r < 0) {
2841 if (IN_SET(r, -EINVAL, -EBADSLT))
2842 *invalid_config = true;
2843 return log_syntax(NULL, LOG_ERR, fname, line, r, "Failed to substitute specifiers in argument: %m");
2844 }
2845
2846 if (!empty_or_root(arg_root)) {
2847 char *p;
2848
2849 p = path_join(arg_root, i.path);
2850 if (!p)
2851 return log_oom();
2852 free_and_replace(i.path, p);
2853 }
2854
2855 if (!empty_or_dash(user)) {
2856 r = find_uid(user, &i.uid, uid_cache);
2857 if (r < 0) {
2858 *invalid_config = true;
2859 return log_syntax(NULL, LOG_ERR, fname, line, r, "Failed to resolve user '%s': %m", user);
2860 }
2861
2862 i.uid_set = true;
2863 }
2864
2865 if (!empty_or_dash(group)) {
2866 r = find_gid(group, &i.gid, gid_cache);
2867 if (r < 0) {
2868 *invalid_config = true;
2869 return log_syntax(NULL, LOG_ERR, fname, line, r, "Failed to resolve group '%s'.", group);
2870 }
2871
2872 i.gid_set = true;
2873 }
2874
2875 if (!empty_or_dash(mode)) {
2876 const char *mm = mode;
2877 unsigned m;
2878
2879 if (*mm == '~') {
2880 i.mask_perms = true;
2881 mm++;
2882 }
2883
2884 r = parse_mode(mm, &m);
2885 if (r < 0) {
2886 *invalid_config = true;
2887 return log_syntax(NULL, LOG_ERR, fname, line, r, "Invalid mode '%s'.", mode);
2888 }
2889
2890 i.mode = m;
2891 i.mode_set = true;
2892 } else
2893 i.mode = IN_SET(i.type, CREATE_DIRECTORY, TRUNCATE_DIRECTORY, CREATE_SUBVOLUME, CREATE_SUBVOLUME_INHERIT_QUOTA, CREATE_SUBVOLUME_NEW_QUOTA) ? 0755 : 0644;
2894
2895 if (!empty_or_dash(age)) {
2896 const char *a = age;
2897
2898 if (*a == '~') {
2899 i.keep_first_level = true;
2900 a++;
2901 }
2902
2903 r = parse_sec(a, &i.age);
2904 if (r < 0) {
2905 *invalid_config = true;
2906 return log_syntax(NULL, LOG_ERR, fname, line, r, "Invalid age '%s'.", age);
2907 }
2908
2909 i.age_set = true;
2910 }
2911
2912 h = needs_glob(i.type) ? globs : items;
2913
2914 existing = ordered_hashmap_get(h, i.path);
2915 if (existing) {
2916 size_t n;
2917
2918 for (n = 0; n < existing->n_items; n++) {
2919 if (!item_compatible(existing->items + n, &i) && !i.append_or_force) {
2920 log_syntax(NULL, LOG_NOTICE, fname, line, 0, "Duplicate line for path \"%s\", ignoring.", i.path);
2921 return 0;
2922 }
2923 }
2924 } else {
2925 existing = new0(ItemArray, 1);
2926 if (!existing)
2927 return log_oom();
2928
2929 r = ordered_hashmap_put(h, i.path, existing);
2930 if (r < 0) {
2931 free(existing);
2932 return log_oom();
2933 }
2934 }
2935
2936 if (!GREEDY_REALLOC(existing->items, existing->allocated, existing->n_items + 1))
2937 return log_oom();
2938
2939 existing->items[existing->n_items++] = i;
2940 i = (struct Item) {};
2941
2942 /* Sort item array, to enforce stable ordering of application */
2943 typesafe_qsort(existing->items, existing->n_items, item_compare);
2944
2945 return 0;
2946 }
2947
2948 static int cat_config(char **config_dirs, char **args) {
2949 _cleanup_strv_free_ char **files = NULL;
2950 int r;
2951
2952 r = conf_files_list_with_replacement(arg_root, config_dirs, arg_replace, &files, NULL);
2953 if (r < 0)
2954 return r;
2955
2956 return cat_files(NULL, files, 0);
2957 }
2958
2959 static int exclude_default_prefixes(void) {
2960 int r;
2961
2962 /* Provide an easy way to exclude virtual/memory file systems from what we do here. Useful in
2963 * combination with --root= where we probably don't want to apply stuff to these dirs as they are
2964 * likely over-mounted if the root directory is actually used, and it wouldbe less than ideal to have
2965 * all kinds of files created/adjusted underneath these mount points. */
2966
2967 r = strv_extend_strv(
2968 &arg_exclude_prefixes,
2969 STRV_MAKE("/dev",
2970 "/proc",
2971 "/run",
2972 "/sys"),
2973 true);
2974 if (r < 0)
2975 return log_oom();
2976
2977 return 0;
2978 }
2979
2980 static int help(void) {
2981 _cleanup_free_ char *link = NULL;
2982 int r;
2983
2984 r = terminal_urlify_man("systemd-tmpfiles", "8", &link);
2985 if (r < 0)
2986 return log_oom();
2987
2988 printf("%s [OPTIONS...] [CONFIGURATION FILE...]\n\n"
2989 "Creates, deletes and cleans up volatile and temporary files and directories.\n\n"
2990 " -h --help Show this help\n"
2991 " --user Execute user configuration\n"
2992 " --version Show package version\n"
2993 " --cat-config Show configuration files\n"
2994 " --create Create marked files/directories\n"
2995 " --clean Clean up marked directories\n"
2996 " --remove Remove marked files/directories\n"
2997 " --boot Execute actions only safe at boot\n"
2998 " --prefix=PATH Only apply rules with the specified prefix\n"
2999 " --exclude-prefix=PATH Ignore rules with the specified prefix\n"
3000 " -E Ignore rules prefixed with /dev, /proc, /run, /sys\n"
3001 " --root=PATH Operate on an alternate filesystem root\n"
3002 " --image=PATH Operate on disk image as filesystem root\n"
3003 " --replace=PATH Treat arguments as replacement for PATH\n"
3004 " --no-pager Do not pipe output into a pager\n"
3005 "\nSee the %s for details.\n"
3006 , program_invocation_short_name
3007 , link
3008 );
3009
3010 return 0;
3011 }
3012
3013 static int parse_argv(int argc, char *argv[]) {
3014
3015 enum {
3016 ARG_VERSION = 0x100,
3017 ARG_CAT_CONFIG,
3018 ARG_USER,
3019 ARG_CREATE,
3020 ARG_CLEAN,
3021 ARG_REMOVE,
3022 ARG_BOOT,
3023 ARG_PREFIX,
3024 ARG_EXCLUDE_PREFIX,
3025 ARG_ROOT,
3026 ARG_IMAGE,
3027 ARG_REPLACE,
3028 ARG_NO_PAGER,
3029 };
3030
3031 static const struct option options[] = {
3032 { "help", no_argument, NULL, 'h' },
3033 { "user", no_argument, NULL, ARG_USER },
3034 { "version", no_argument, NULL, ARG_VERSION },
3035 { "cat-config", no_argument, NULL, ARG_CAT_CONFIG },
3036 { "create", no_argument, NULL, ARG_CREATE },
3037 { "clean", no_argument, NULL, ARG_CLEAN },
3038 { "remove", no_argument, NULL, ARG_REMOVE },
3039 { "boot", no_argument, NULL, ARG_BOOT },
3040 { "prefix", required_argument, NULL, ARG_PREFIX },
3041 { "exclude-prefix", required_argument, NULL, ARG_EXCLUDE_PREFIX },
3042 { "root", required_argument, NULL, ARG_ROOT },
3043 { "image", required_argument, NULL, ARG_IMAGE },
3044 { "replace", required_argument, NULL, ARG_REPLACE },
3045 { "no-pager", no_argument, NULL, ARG_NO_PAGER },
3046 {}
3047 };
3048
3049 int c, r;
3050
3051 assert(argc >= 0);
3052 assert(argv);
3053
3054 while ((c = getopt_long(argc, argv, "hE", options, NULL)) >= 0)
3055
3056 switch (c) {
3057
3058 case 'h':
3059 return help();
3060
3061 case ARG_VERSION:
3062 return version();
3063
3064 case ARG_CAT_CONFIG:
3065 arg_cat_config = true;
3066 break;
3067
3068 case ARG_USER:
3069 arg_user = true;
3070 break;
3071
3072 case ARG_CREATE:
3073 arg_operation |= OPERATION_CREATE;
3074 break;
3075
3076 case ARG_CLEAN:
3077 arg_operation |= OPERATION_CLEAN;
3078 break;
3079
3080 case ARG_REMOVE:
3081 arg_operation |= OPERATION_REMOVE;
3082 break;
3083
3084 case ARG_BOOT:
3085 arg_boot = true;
3086 break;
3087
3088 case ARG_PREFIX:
3089 if (strv_push(&arg_include_prefixes, optarg) < 0)
3090 return log_oom();
3091 break;
3092
3093 case ARG_EXCLUDE_PREFIX:
3094 if (strv_push(&arg_exclude_prefixes, optarg) < 0)
3095 return log_oom();
3096 break;
3097
3098 case ARG_ROOT:
3099 r = parse_path_argument_and_warn(optarg, /* suppress_root= */ false, &arg_root);
3100 if (r < 0)
3101 return r;
3102 break;
3103
3104 case ARG_IMAGE:
3105 r = parse_path_argument_and_warn(optarg, /* suppress_root= */ false, &arg_image);
3106 if (r < 0)
3107 return r;
3108
3109 /* Imply -E here since it makes little sense to create files persistently in the /run mointpoint of a disk image */
3110 _fallthrough_;
3111
3112 case 'E':
3113 r = exclude_default_prefixes();
3114 if (r < 0)
3115 return r;
3116
3117 break;
3118
3119 case ARG_REPLACE:
3120 if (!path_is_absolute(optarg) ||
3121 !endswith(optarg, ".conf"))
3122 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
3123 "The argument to --replace= must an absolute path to a config file");
3124
3125 arg_replace = optarg;
3126 break;
3127
3128 case ARG_NO_PAGER:
3129 arg_pager_flags |= PAGER_DISABLE;
3130 break;
3131
3132 case '?':
3133 return -EINVAL;
3134
3135 default:
3136 assert_not_reached("Unhandled option");
3137 }
3138
3139 if (arg_operation == 0 && !arg_cat_config)
3140 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
3141 "You need to specify at least one of --clean, --create or --remove.");
3142
3143 if (arg_replace && arg_cat_config)
3144 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
3145 "Option --replace= is not supported with --cat-config");
3146
3147 if (arg_replace && optind >= argc)
3148 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
3149 "When --replace= is given, some configuration items must be specified");
3150
3151 if (arg_root && arg_user)
3152 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
3153 "Combination of --user and --root= is not supported.");
3154
3155 if (arg_image && arg_root)
3156 return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "Please specify either --root= or --image=, the combination of both is not supported.");
3157
3158 return 1;
3159 }
3160
3161 static int read_config_file(char **config_dirs, const char *fn, bool ignore_enoent, bool *invalid_config) {
3162 _cleanup_(hashmap_freep) Hashmap *uid_cache = NULL, *gid_cache = NULL;
3163 _cleanup_fclose_ FILE *_f = NULL;
3164 unsigned v = 0;
3165 FILE *f;
3166 Item *i;
3167 int r = 0;
3168
3169 assert(fn);
3170
3171 if (streq(fn, "-")) {
3172 log_debug("Reading config from stdin…");
3173 fn = "<stdin>";
3174 f = stdin;
3175 } else {
3176 r = search_and_fopen(fn, "re", arg_root, (const char**) config_dirs, &_f);
3177 if (r < 0) {
3178 if (ignore_enoent && r == -ENOENT) {
3179 log_debug_errno(r, "Failed to open \"%s\", ignoring: %m", fn);
3180 return 0;
3181 }
3182
3183 return log_error_errno(r, "Failed to open '%s': %m", fn);
3184 }
3185 log_debug("Reading config file \"%s\"…", fn);
3186 f = _f;
3187 }
3188
3189 for (;;) {
3190 _cleanup_free_ char *line = NULL;
3191 bool invalid_line = false;
3192 char *l;
3193 int k;
3194
3195 k = read_line(f, LONG_LINE_MAX, &line);
3196 if (k < 0)
3197 return log_error_errno(k, "Failed to read '%s': %m", fn);
3198 if (k == 0)
3199 break;
3200
3201 v++;
3202
3203 l = strstrip(line);
3204 if (IN_SET(*l, 0, '#'))
3205 continue;
3206
3207 k = parse_line(fn, v, l, &invalid_line, &uid_cache, &gid_cache);
3208 if (k < 0) {
3209 if (invalid_line)
3210 /* Allow reporting with a special code if the caller requested this */
3211 *invalid_config = true;
3212 else if (r == 0)
3213 /* The first error becomes our return value */
3214 r = k;
3215 }
3216 }
3217
3218 /* we have to determine age parameter for each entry of type X */
3219 ORDERED_HASHMAP_FOREACH(i, globs) {
3220 Item *j, *candidate_item = NULL;
3221
3222 if (i->type != IGNORE_DIRECTORY_PATH)
3223 continue;
3224
3225 ORDERED_HASHMAP_FOREACH(j, items) {
3226 if (!IN_SET(j->type, CREATE_DIRECTORY, TRUNCATE_DIRECTORY, CREATE_SUBVOLUME, CREATE_SUBVOLUME_INHERIT_QUOTA, CREATE_SUBVOLUME_NEW_QUOTA))
3227 continue;
3228
3229 if (path_equal(j->path, i->path)) {
3230 candidate_item = j;
3231 break;
3232 }
3233
3234 if ((!candidate_item && path_startswith(i->path, j->path)) ||
3235 (candidate_item && path_startswith(j->path, candidate_item->path) && (fnmatch(i->path, j->path, FNM_PATHNAME | FNM_PERIOD) == 0)))
3236 candidate_item = j;
3237 }
3238
3239 if (candidate_item && candidate_item->age_set) {
3240 i->age = candidate_item->age;
3241 i->age_set = true;
3242 }
3243 }
3244
3245 if (ferror(f)) {
3246 log_error_errno(errno, "Failed to read from file %s: %m", fn);
3247 if (r == 0)
3248 r = -EIO;
3249 }
3250
3251 return r;
3252 }
3253
3254 static int parse_arguments(char **config_dirs, char **args, bool *invalid_config) {
3255 char **arg;
3256 int r;
3257
3258 STRV_FOREACH(arg, args) {
3259 r = read_config_file(config_dirs, *arg, false, invalid_config);
3260 if (r < 0)
3261 return r;
3262 }
3263
3264 return 0;
3265 }
3266
3267 static int read_config_files(char **config_dirs, char **args, bool *invalid_config) {
3268 _cleanup_strv_free_ char **files = NULL;
3269 _cleanup_free_ char *p = NULL;
3270 char **f;
3271 int r;
3272
3273 r = conf_files_list_with_replacement(arg_root, config_dirs, arg_replace, &files, &p);
3274 if (r < 0)
3275 return r;
3276
3277 STRV_FOREACH(f, files)
3278 if (p && path_equal(*f, p)) {
3279 log_debug("Parsing arguments at position \"%s\"…", *f);
3280
3281 r = parse_arguments(config_dirs, args, invalid_config);
3282 if (r < 0)
3283 return r;
3284 } else
3285 /* Just warn, ignore result otherwise.
3286 * read_config_file() has some debug output, so no need to print anything. */
3287 (void) read_config_file(config_dirs, *f, true, invalid_config);
3288
3289 return 0;
3290 }
3291
3292 static int link_parent(ItemArray *a) {
3293 const char *path;
3294 char *prefix;
3295 int r;
3296
3297 assert(a);
3298
3299 /* Finds the closest "parent" item array for the specified item array. Then registers the specified item array
3300 * as child of it, and fills the parent in, linking them both ways. This allows us to later create parents
3301 * before their children, and clean up/remove children before their parents. */
3302
3303 if (a->n_items <= 0)
3304 return 0;
3305
3306 path = a->items[0].path;
3307 prefix = newa(char, strlen(path) + 1);
3308 PATH_FOREACH_PREFIX(prefix, path) {
3309 ItemArray *j;
3310
3311 j = ordered_hashmap_get(items, prefix);
3312 if (!j)
3313 j = ordered_hashmap_get(globs, prefix);
3314 if (j) {
3315 r = set_ensure_put(&j->children, NULL, a);
3316 if (r < 0)
3317 return log_oom();
3318
3319 a->parent = j;
3320 return 1;
3321 }
3322 }
3323
3324 return 0;
3325 }
3326
3327 DEFINE_PRIVATE_HASH_OPS_WITH_VALUE_DESTRUCTOR(item_array_hash_ops, char, string_hash_func, string_compare_func,
3328 ItemArray, item_array_free);
3329
3330 static int run(int argc, char *argv[]) {
3331 _cleanup_(loop_device_unrefp) LoopDevice *loop_device = NULL;
3332 _cleanup_(decrypted_image_unrefp) DecryptedImage *decrypted_image = NULL;
3333 _cleanup_(umount_and_rmdir_and_freep) char *unlink_dir = NULL;
3334 _cleanup_strv_free_ char **config_dirs = NULL;
3335 bool invalid_config = false;
3336 ItemArray *a;
3337 enum {
3338 PHASE_REMOVE_AND_CLEAN,
3339 PHASE_CREATE,
3340 _PHASE_MAX
3341 } phase;
3342 int r, k;
3343
3344 r = parse_argv(argc, argv);
3345 if (r <= 0)
3346 return r;
3347
3348 log_setup_service();
3349
3350 /* Descending down file system trees might take a lot of fds */
3351 (void) rlimit_nofile_bump(HIGH_RLIMIT_NOFILE);
3352
3353 if (arg_user) {
3354 r = user_config_paths(&config_dirs);
3355 if (r < 0)
3356 return log_error_errno(r, "Failed to initialize configuration directory list: %m");
3357 } else {
3358 config_dirs = strv_split_nulstr(CONF_PATHS_NULSTR("tmpfiles.d"));
3359 if (!config_dirs)
3360 return log_oom();
3361 }
3362
3363 if (DEBUG_LOGGING) {
3364 _cleanup_free_ char *t = NULL;
3365 char **i;
3366
3367 STRV_FOREACH(i, config_dirs) {
3368 _cleanup_free_ char *j = NULL;
3369
3370 j = path_join(arg_root, *i);
3371 if (!j)
3372 return log_oom();
3373
3374 if (!strextend(&t, "\n\t", j, NULL))
3375 return log_oom();
3376 }
3377
3378 log_debug("Looking for configuration files in (higher priority first):%s", t);
3379 }
3380
3381 if (arg_cat_config) {
3382 (void) pager_open(arg_pager_flags);
3383
3384 return cat_config(config_dirs, argv + optind);
3385 }
3386
3387 umask(0022);
3388
3389 r = mac_selinux_init();
3390 if (r < 0)
3391 return r;
3392
3393 if (arg_image) {
3394 assert(!arg_root);
3395
3396 r = mount_image_privately_interactively(
3397 arg_image,
3398 DISSECT_IMAGE_REQUIRE_ROOT|DISSECT_IMAGE_VALIDATE_OS|DISSECT_IMAGE_RELAX_VAR_CHECK|DISSECT_IMAGE_FSCK,
3399 &unlink_dir,
3400 &loop_device,
3401 &decrypted_image);
3402 if (r < 0)
3403 return r;
3404
3405 arg_root = strdup(unlink_dir);
3406 if (!arg_root)
3407 return log_oom();
3408 }
3409
3410 items = ordered_hashmap_new(&item_array_hash_ops);
3411 globs = ordered_hashmap_new(&item_array_hash_ops);
3412 if (!items || !globs)
3413 return log_oom();
3414
3415 /* If command line arguments are specified along with --replace, read all
3416 * configuration files and insert the positional arguments at the specified
3417 * place. Otherwise, if command line arguments are specified, execute just
3418 * them, and finally, without --replace= or any positional arguments, just
3419 * read configuration and execute it.
3420 */
3421 if (arg_replace || optind >= argc)
3422 r = read_config_files(config_dirs, argv + optind, &invalid_config);
3423 else
3424 r = parse_arguments(config_dirs, argv + optind, &invalid_config);
3425 if (r < 0)
3426 return r;
3427
3428 /* Let's now link up all child/parent relationships */
3429 ORDERED_HASHMAP_FOREACH(a, items) {
3430 r = link_parent(a);
3431 if (r < 0)
3432 return r;
3433 }
3434 ORDERED_HASHMAP_FOREACH(a, globs) {
3435 r = link_parent(a);
3436 if (r < 0)
3437 return r;
3438 }
3439
3440 /* If multiple operations are requested, let's first run the remove/clean operations, and only then the create
3441 * operations. i.e. that we first clean out the platform we then build on. */
3442 for (phase = 0; phase < _PHASE_MAX; phase++) {
3443 OperationMask op;
3444
3445 if (phase == PHASE_REMOVE_AND_CLEAN)
3446 op = arg_operation & (OPERATION_REMOVE|OPERATION_CLEAN);
3447 else if (phase == PHASE_CREATE)
3448 op = arg_operation & OPERATION_CREATE;
3449 else
3450 assert_not_reached("unexpected phase");
3451
3452 if (op == 0) /* Nothing requested in this phase */
3453 continue;
3454
3455 /* The non-globbing ones usually create things, hence we apply them first */
3456 ORDERED_HASHMAP_FOREACH(a, items) {
3457 k = process_item_array(a, op);
3458 if (k < 0 && r >= 0)
3459 r = k;
3460 }
3461
3462 /* The globbing ones usually alter things, hence we apply them second. */
3463 ORDERED_HASHMAP_FOREACH(a, globs) {
3464 k = process_item_array(a, op);
3465 if (k < 0 && r >= 0)
3466 r = k;
3467 }
3468 }
3469
3470 if (ERRNO_IS_RESOURCE(r))
3471 return r;
3472 if (invalid_config)
3473 return EX_DATAERR;
3474 if (r < 0)
3475 return EX_CANTCREAT;
3476 return 0;
3477 }
3478
3479 DEFINE_MAIN_FUNCTION_WITH_POSITIVE_FAILURE(run);
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