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Merge pull request #31531 from poettering/verity-userspace-optional
[thirdparty/systemd.git] / src / tmpfiles / tmpfiles.c
1 /* SPDX-License-Identifier: LGPL-2.1-or-later */
2
3 #include <errno.h>
4 #include <fcntl.h>
5 #include <fnmatch.h>
6 #include <getopt.h>
7 #include <limits.h>
8 #include <linux/fs.h>
9 #include <stdbool.h>
10 #include <stddef.h>
11 #include <stdlib.h>
12 #include <sys/file.h>
13 #include <sys/xattr.h>
14 #include <sysexits.h>
15 #include <time.h>
16 #include <unistd.h>
17
18 #include "sd-path.h"
19
20 #include "acl-util.h"
21 #include "alloc-util.h"
22 #include "btrfs-util.h"
23 #include "build.h"
24 #include "capability-util.h"
25 #include "chase.h"
26 #include "chattr-util.h"
27 #include "conf-files.h"
28 #include "constants.h"
29 #include "copy.h"
30 #include "creds-util.h"
31 #include "devnum-util.h"
32 #include "dirent-util.h"
33 #include "dissect-image.h"
34 #include "env-util.h"
35 #include "errno-util.h"
36 #include "escape.h"
37 #include "fd-util.h"
38 #include "fileio.h"
39 #include "format-util.h"
40 #include "fs-util.h"
41 #include "glob-util.h"
42 #include "hexdecoct.h"
43 #include "io-util.h"
44 #include "label-util.h"
45 #include "log.h"
46 #include "macro.h"
47 #include "main-func.h"
48 #include "missing_syscall.h"
49 #include "mkdir-label.h"
50 #include "mount-util.h"
51 #include "mountpoint-util.h"
52 #include "nulstr-util.h"
53 #include "offline-passwd.h"
54 #include "pager.h"
55 #include "parse-argument.h"
56 #include "parse-util.h"
57 #include "path-lookup.h"
58 #include "path-util.h"
59 #include "pretty-print.h"
60 #include "rlimit-util.h"
61 #include "rm-rf.h"
62 #include "selinux-util.h"
63 #include "set.h"
64 #include "sort-util.h"
65 #include "specifier.h"
66 #include "stat-util.h"
67 #include "stdio-util.h"
68 #include "string-table.h"
69 #include "string-util.h"
70 #include "strv.h"
71 #include "terminal-util.h"
72 #include "umask-util.h"
73 #include "user-util.h"
74 #include "virt.h"
75
76 /* This reads all files listed in /etc/tmpfiles.d/?*.conf and creates
77 * them in the file system. This is intended to be used to create
78 * properly owned directories beneath /tmp, /var/tmp, /run, which are
79 * volatile and hence need to be recreated on bootup. */
80
81 typedef enum OperationMask {
82 OPERATION_CREATE = 1 << 0,
83 OPERATION_REMOVE = 1 << 1,
84 OPERATION_CLEAN = 1 << 2,
85 OPERATION_PURGE = 1 << 3,
86 } OperationMask;
87
88 typedef enum ItemType {
89 /* These ones take file names */
90 CREATE_FILE = 'f',
91 TRUNCATE_FILE = 'F', /* deprecated: use f+ */
92 CREATE_DIRECTORY = 'd',
93 TRUNCATE_DIRECTORY = 'D',
94 CREATE_SUBVOLUME = 'v',
95 CREATE_SUBVOLUME_INHERIT_QUOTA = 'q',
96 CREATE_SUBVOLUME_NEW_QUOTA = 'Q',
97 CREATE_FIFO = 'p',
98 CREATE_SYMLINK = 'L',
99 CREATE_CHAR_DEVICE = 'c',
100 CREATE_BLOCK_DEVICE = 'b',
101 COPY_FILES = 'C',
102
103 /* These ones take globs */
104 WRITE_FILE = 'w',
105 EMPTY_DIRECTORY = 'e',
106 SET_XATTR = 't',
107 RECURSIVE_SET_XATTR = 'T',
108 SET_ACL = 'a',
109 RECURSIVE_SET_ACL = 'A',
110 SET_ATTRIBUTE = 'h',
111 RECURSIVE_SET_ATTRIBUTE = 'H',
112 IGNORE_PATH = 'x',
113 IGNORE_DIRECTORY_PATH = 'X',
114 REMOVE_PATH = 'r',
115 RECURSIVE_REMOVE_PATH = 'R',
116 RELABEL_PATH = 'z',
117 RECURSIVE_RELABEL_PATH = 'Z',
118 ADJUST_MODE = 'm', /* legacy, 'z' is identical to this */
119 } ItemType;
120
121 typedef enum AgeBy {
122 AGE_BY_ATIME = 1 << 0,
123 AGE_BY_BTIME = 1 << 1,
124 AGE_BY_CTIME = 1 << 2,
125 AGE_BY_MTIME = 1 << 3,
126
127 /* All file timestamp types are checked by default. */
128 AGE_BY_DEFAULT_FILE = AGE_BY_ATIME | AGE_BY_BTIME | AGE_BY_CTIME | AGE_BY_MTIME,
129 AGE_BY_DEFAULT_DIR = AGE_BY_ATIME | AGE_BY_BTIME | AGE_BY_MTIME,
130 } AgeBy;
131
132 typedef struct Item {
133 ItemType type;
134
135 char *path;
136 char *argument;
137 void *binary_argument; /* set if binary data, in which case it takes precedence over 'argument' */
138 size_t binary_argument_size;
139 char **xattrs;
140 #if HAVE_ACL
141 acl_t acl_access;
142 acl_t acl_access_exec;
143 acl_t acl_default;
144 #endif
145 uid_t uid;
146 gid_t gid;
147 mode_t mode;
148 usec_t age;
149 AgeBy age_by_file, age_by_dir;
150
151 dev_t major_minor;
152 unsigned attribute_value;
153 unsigned attribute_mask;
154
155 bool uid_set:1;
156 bool gid_set:1;
157 bool mode_set:1;
158 bool uid_only_create:1;
159 bool gid_only_create:1;
160 bool mode_only_create:1;
161 bool age_set:1;
162 bool mask_perms:1;
163 bool attribute_set:1;
164
165 bool keep_first_level:1;
166
167 bool append_or_force:1;
168
169 bool allow_failure:1;
170
171 bool try_replace:1;
172
173 OperationMask done;
174 } Item;
175
176 typedef struct ItemArray {
177 Item *items;
178 size_t n_items;
179
180 struct ItemArray *parent;
181 Set *children;
182 } ItemArray;
183
184 typedef enum DirectoryType {
185 DIRECTORY_RUNTIME,
186 DIRECTORY_STATE,
187 DIRECTORY_CACHE,
188 DIRECTORY_LOGS,
189 _DIRECTORY_TYPE_MAX,
190 } DirectoryType;
191
192 typedef enum {
193 CREATION_NORMAL,
194 CREATION_EXISTING,
195 CREATION_FORCE,
196 _CREATION_MODE_MAX,
197 _CREATION_MODE_INVALID = -EINVAL,
198 } CreationMode;
199
200 static CatFlags arg_cat_flags = CAT_CONFIG_OFF;
201 static bool arg_dry_run = false;
202 static RuntimeScope arg_runtime_scope = RUNTIME_SCOPE_SYSTEM;
203 static OperationMask arg_operation = 0;
204 static bool arg_boot = false;
205 static bool arg_graceful = false;
206 static PagerFlags arg_pager_flags = 0;
207
208 static char **arg_include_prefixes = NULL;
209 static char **arg_exclude_prefixes = NULL;
210 static char *arg_root = NULL;
211 static char *arg_image = NULL;
212 static char *arg_replace = NULL;
213 static ImagePolicy *arg_image_policy = NULL;
214
215 #define MAX_DEPTH 256
216
217 typedef struct Context {
218 OrderedHashmap *items;
219 OrderedHashmap *globs;
220 Set *unix_sockets;
221 Hashmap *uid_cache;
222 Hashmap *gid_cache;
223 } Context;
224
225 STATIC_DESTRUCTOR_REGISTER(arg_include_prefixes, strv_freep);
226 STATIC_DESTRUCTOR_REGISTER(arg_exclude_prefixes, strv_freep);
227 STATIC_DESTRUCTOR_REGISTER(arg_root, freep);
228 STATIC_DESTRUCTOR_REGISTER(arg_image, freep);
229 STATIC_DESTRUCTOR_REGISTER(arg_image_policy, image_policy_freep);
230
231 static const char *const creation_mode_verb_table[_CREATION_MODE_MAX] = {
232 [CREATION_NORMAL] = "Created",
233 [CREATION_EXISTING] = "Found existing",
234 [CREATION_FORCE] = "Created replacement",
235 };
236
237 DEFINE_PRIVATE_STRING_TABLE_LOOKUP_TO_STRING(creation_mode_verb, CreationMode);
238
239 static void context_done(Context *c) {
240 assert(c);
241
242 ordered_hashmap_free(c->items);
243 ordered_hashmap_free(c->globs);
244
245 set_free(c->unix_sockets);
246
247 hashmap_free(c->uid_cache);
248 hashmap_free(c->gid_cache);
249 }
250
251 /* Different kinds of errors that mean that information is not available in the environment. */
252 static bool ERRNO_IS_NOINFO(int r) {
253 return IN_SET(abs(r),
254 EUNATCH, /* os-release or machine-id missing */
255 ENOMEDIUM, /* machine-id or another file empty */
256 ENOPKG, /* machine-id is uninitialized */
257 ENXIO); /* env var is unset */
258 }
259
260 static int specifier_directory(
261 char specifier,
262 const void *data,
263 const char *root,
264 const void *userdata,
265 char **ret) {
266
267 struct table_entry {
268 uint64_t type;
269 const char *suffix;
270 };
271
272 static const struct table_entry paths_system[] = {
273 [DIRECTORY_RUNTIME] = { SD_PATH_SYSTEM_RUNTIME },
274 [DIRECTORY_STATE] = { SD_PATH_SYSTEM_STATE_PRIVATE },
275 [DIRECTORY_CACHE] = { SD_PATH_SYSTEM_STATE_CACHE },
276 [DIRECTORY_LOGS] = { SD_PATH_SYSTEM_STATE_LOGS },
277 };
278
279 static const struct table_entry paths_user[] = {
280 [DIRECTORY_RUNTIME] = { SD_PATH_USER_RUNTIME },
281 [DIRECTORY_STATE] = { SD_PATH_USER_STATE_PRIVATE },
282 [DIRECTORY_CACHE] = { SD_PATH_USER_STATE_CACHE },
283 [DIRECTORY_LOGS] = { SD_PATH_USER_STATE_PRIVATE, "log" },
284 };
285
286 const struct table_entry *paths;
287 _cleanup_free_ char *p = NULL;
288 unsigned i;
289 int r;
290
291 assert_cc(ELEMENTSOF(paths_system) == ELEMENTSOF(paths_user));
292 paths = arg_runtime_scope == RUNTIME_SCOPE_USER ? paths_user : paths_system;
293
294 i = PTR_TO_UINT(data);
295 assert(i < ELEMENTSOF(paths_system));
296
297 r = sd_path_lookup(paths[i].type, paths[i].suffix, &p);
298 if (r < 0)
299 return r;
300
301 if (arg_root) {
302 _cleanup_free_ char *j = NULL;
303
304 j = path_join(arg_root, p);
305 if (!j)
306 return -ENOMEM;
307
308 *ret = TAKE_PTR(j);
309 } else
310 *ret = TAKE_PTR(p);
311
312 return 0;
313 }
314
315 static int log_unresolvable_specifier(const char *filename, unsigned line) {
316 static bool notified = false;
317
318 /* In system mode, this is called when /etc is not fully initialized and some specifiers are
319 * unresolvable. In user mode, this is called when some variables are not defined. These cases are
320 * not considered a fatal error, so log at LOG_NOTICE only for the first time and then downgrade this
321 * to LOG_DEBUG for the rest.
322 *
323 * If we're running in a chroot (--root was used or sd_booted() reports that systemd is not running),
324 * always use LOG_DEBUG. We may be called to initialize a chroot before booting and there is no
325 * expectation that machine-id and other files will be populated.
326 */
327
328 int log_level = notified || arg_root || running_in_chroot() > 0 ?
329 LOG_DEBUG : LOG_NOTICE;
330
331 log_syntax(NULL,
332 log_level,
333 filename, line, 0,
334 "Failed to resolve specifier: %s, skipping.",
335 arg_runtime_scope == RUNTIME_SCOPE_USER ? "Required $XDG_... variable not defined" : "uninitialized /etc/ detected");
336
337 if (!notified)
338 log_full(log_level,
339 "All rules containing unresolvable specifiers will be skipped.");
340
341 notified = true;
342 return 0;
343 }
344
345 #define log_action(would, doing, fmt, ...) \
346 log_full(arg_dry_run ? LOG_INFO : LOG_DEBUG, \
347 fmt, \
348 arg_dry_run ? (would) : (doing), \
349 __VA_ARGS__)
350
351 static int user_config_paths(char*** ret) {
352 _cleanup_strv_free_ char **config_dirs = NULL, **data_dirs = NULL;
353 _cleanup_free_ char *persistent_config = NULL, *runtime_config = NULL, *data_home = NULL;
354 _cleanup_strv_free_ char **res = NULL;
355 int r;
356
357 r = xdg_user_dirs(&config_dirs, &data_dirs);
358 if (r < 0)
359 return r;
360
361 r = xdg_user_config_dir(&persistent_config, "/user-tmpfiles.d");
362 if (r < 0 && !ERRNO_IS_NOINFO(r))
363 return r;
364
365 r = xdg_user_runtime_dir(&runtime_config, "/user-tmpfiles.d");
366 if (r < 0 && !ERRNO_IS_NOINFO(r))
367 return r;
368
369 r = xdg_user_data_dir(&data_home, "/user-tmpfiles.d");
370 if (r < 0 && !ERRNO_IS_NOINFO(r))
371 return r;
372
373 r = strv_extend_strv_concat(&res, config_dirs, "/user-tmpfiles.d");
374 if (r < 0)
375 return r;
376
377 r = strv_extend_many(
378 &res,
379 persistent_config,
380 runtime_config,
381 data_home);
382 if (r < 0)
383 return r;
384
385 r = strv_extend_strv_concat(&res, data_dirs, "/user-tmpfiles.d");
386 if (r < 0)
387 return r;
388
389 r = path_strv_make_absolute_cwd(res);
390 if (r < 0)
391 return r;
392
393 *ret = TAKE_PTR(res);
394 return 0;
395 }
396
397 static bool needs_purge(ItemType t) {
398 return IN_SET(t,
399 COPY_FILES,
400 TRUNCATE_FILE,
401 CREATE_FILE,
402 WRITE_FILE,
403 EMPTY_DIRECTORY,
404 CREATE_SUBVOLUME,
405 CREATE_SUBVOLUME_INHERIT_QUOTA,
406 CREATE_SUBVOLUME_NEW_QUOTA,
407 CREATE_CHAR_DEVICE,
408 CREATE_BLOCK_DEVICE,
409 CREATE_SYMLINK,
410 CREATE_FIFO,
411 CREATE_DIRECTORY,
412 TRUNCATE_DIRECTORY);
413 }
414
415 static bool needs_glob(ItemType t) {
416 return IN_SET(t,
417 WRITE_FILE,
418 EMPTY_DIRECTORY,
419 SET_XATTR,
420 RECURSIVE_SET_XATTR,
421 SET_ACL,
422 RECURSIVE_SET_ACL,
423 SET_ATTRIBUTE,
424 RECURSIVE_SET_ATTRIBUTE,
425 IGNORE_PATH,
426 IGNORE_DIRECTORY_PATH,
427 REMOVE_PATH,
428 RECURSIVE_REMOVE_PATH,
429 RELABEL_PATH,
430 RECURSIVE_RELABEL_PATH,
431 ADJUST_MODE);
432 }
433
434 static bool takes_ownership(ItemType t) {
435 return IN_SET(t,
436 CREATE_FILE,
437 TRUNCATE_FILE,
438 CREATE_DIRECTORY,
439 TRUNCATE_DIRECTORY,
440 CREATE_SUBVOLUME,
441 CREATE_SUBVOLUME_INHERIT_QUOTA,
442 CREATE_SUBVOLUME_NEW_QUOTA,
443 CREATE_FIFO,
444 CREATE_SYMLINK,
445 CREATE_CHAR_DEVICE,
446 CREATE_BLOCK_DEVICE,
447 COPY_FILES,
448 WRITE_FILE,
449 EMPTY_DIRECTORY,
450 IGNORE_PATH,
451 IGNORE_DIRECTORY_PATH,
452 REMOVE_PATH,
453 RECURSIVE_REMOVE_PATH);
454 }
455
456 static struct Item* find_glob(OrderedHashmap *h, const char *match) {
457 ItemArray *j;
458
459 ORDERED_HASHMAP_FOREACH(j, h)
460 FOREACH_ARRAY(item, j->items, j->n_items)
461 if (fnmatch(item->path, match, FNM_PATHNAME|FNM_PERIOD) == 0)
462 return item;
463 return NULL;
464 }
465
466 static int load_unix_sockets(Context *c) {
467 _cleanup_set_free_ Set *sockets = NULL;
468 _cleanup_fclose_ FILE *f = NULL;
469 int r;
470
471 if (c->unix_sockets)
472 return 0;
473
474 /* We maintain a cache of the sockets we found in /proc/net/unix to speed things up a little. */
475
476 f = fopen("/proc/net/unix", "re");
477 if (!f)
478 return log_full_errno(errno == ENOENT ? LOG_DEBUG : LOG_WARNING, errno,
479 "Failed to open /proc/net/unix, ignoring: %m");
480
481 /* Skip header */
482 r = read_line(f, LONG_LINE_MAX, NULL);
483 if (r < 0)
484 return log_warning_errno(r, "Failed to skip /proc/net/unix header line: %m");
485 if (r == 0)
486 return log_warning_errno(SYNTHETIC_ERRNO(EIO), "Premature end of file reading /proc/net/unix.");
487
488 for (;;) {
489 _cleanup_free_ char *line = NULL;
490 char *p;
491
492 r = read_line(f, LONG_LINE_MAX, &line);
493 if (r < 0)
494 return log_warning_errno(r, "Failed to read /proc/net/unix line, ignoring: %m");
495 if (r == 0) /* EOF */
496 break;
497
498 p = strchr(line, ':');
499 if (!p)
500 continue;
501
502 if (strlen(p) < 37)
503 continue;
504
505 p += 37;
506 p += strspn(p, WHITESPACE);
507 p += strcspn(p, WHITESPACE); /* skip one more word */
508 p += strspn(p, WHITESPACE);
509
510 if (!path_is_absolute(p))
511 continue;
512
513 r = set_put_strdup_full(&sockets, &path_hash_ops_free, p);
514 if (r < 0)
515 return log_warning_errno(r, "Failed to add AF_UNIX socket to set, ignoring: %m");
516 }
517
518 c->unix_sockets = TAKE_PTR(sockets);
519 return 1;
520 }
521
522 static bool unix_socket_alive(Context *c, const char *fn) {
523 assert(c);
524 assert(fn);
525
526 if (load_unix_sockets(c) < 0)
527 return true; /* We don't know, so assume yes */
528
529 return set_contains(c->unix_sockets, fn);
530 }
531
532 /* Accessors for the argument in binary format */
533 static const void* item_binary_argument(const Item *i) {
534 assert(i);
535 return i->binary_argument ?: i->argument;
536 }
537
538 static size_t item_binary_argument_size(const Item *i) {
539 assert(i);
540 return i->binary_argument ? i->binary_argument_size : strlen_ptr(i->argument);
541 }
542
543 static DIR* xopendirat_nomod(int dirfd, const char *path) {
544 DIR *dir;
545
546 dir = xopendirat(dirfd, path, O_NOFOLLOW|O_NOATIME);
547 if (dir)
548 return dir;
549
550 if (!IN_SET(errno, ENOENT, ELOOP))
551 log_debug_errno(errno, "Cannot open %sdirectory \"%s\": %m", dirfd == AT_FDCWD ? "" : "sub", path);
552
553 if (errno != EPERM)
554 return NULL;
555
556 dir = xopendirat(dirfd, path, O_NOFOLLOW);
557 if (!dir)
558 log_debug_errno(errno, "Cannot open %sdirectory \"%s\": %m", dirfd == AT_FDCWD ? "" : "sub", path);
559
560 return dir;
561 }
562
563 static DIR* opendir_nomod(const char *path) {
564 return xopendirat_nomod(AT_FDCWD, path);
565 }
566
567 static int opendir_and_stat(
568 const char *path,
569 DIR **ret,
570 struct statx *ret_sx,
571 bool *ret_mountpoint) {
572
573 _cleanup_closedir_ DIR *d = NULL;
574 STRUCT_NEW_STATX_DEFINE(st1);
575 int r;
576
577 assert(path);
578 assert(ret);
579 assert(ret_sx);
580 assert(ret_mountpoint);
581
582 /* Do opendir() and statx() on the directory.
583 * Return 1 if successful, 0 if file doesn't exist or is not a directory,
584 * negative errno otherwise.
585 */
586
587 d = opendir_nomod(path);
588 if (!d) {
589 bool ignore = IN_SET(errno, ENOENT, ENOTDIR);
590 r = log_full_errno(ignore ? LOG_DEBUG : LOG_ERR,
591 errno, "Failed to open directory %s: %m", path);
592 if (!ignore)
593 return r;
594
595 *ret = NULL;
596 *ret_sx = (struct statx) {};
597 *ret_mountpoint = NULL;
598 return 0;
599 }
600
601 r = statx_fallback(dirfd(d), "", AT_EMPTY_PATH, STATX_MODE|STATX_INO|STATX_ATIME|STATX_MTIME, &st1.sx);
602 if (r < 0)
603 return log_error_errno(r, "statx(%s) failed: %m", path);
604
605 if (FLAGS_SET(st1.sx.stx_attributes_mask, STATX_ATTR_MOUNT_ROOT))
606 *ret_mountpoint = FLAGS_SET(st1.sx.stx_attributes, STATX_ATTR_MOUNT_ROOT);
607 else {
608 STRUCT_NEW_STATX_DEFINE(st2);
609
610 r = statx_fallback(dirfd(d), "..", 0, STATX_INO, &st2.sx);
611 if (r < 0)
612 return log_error_errno(r, "statx(%s/..) failed: %m", path);
613
614 *ret_mountpoint = !statx_mount_same(&st1.nsx, &st2.nsx);
615 }
616
617 *ret = TAKE_PTR(d);
618 *ret_sx = st1.sx;
619 return 1;
620 }
621
622 static bool needs_cleanup(
623 nsec_t atime,
624 nsec_t btime,
625 nsec_t ctime,
626 nsec_t mtime,
627 nsec_t cutoff,
628 const char *sub_path,
629 AgeBy age_by,
630 bool is_dir) {
631
632 if (FLAGS_SET(age_by, AGE_BY_MTIME) && mtime != NSEC_INFINITY && mtime >= cutoff) {
633 /* Follows spelling in stat(1). */
634 log_debug("%s \"%s\": modify time %s is too new.",
635 is_dir ? "Directory" : "File",
636 sub_path,
637 FORMAT_TIMESTAMP_STYLE(mtime / NSEC_PER_USEC, TIMESTAMP_US));
638
639 return false;
640 }
641
642 if (FLAGS_SET(age_by, AGE_BY_ATIME) && atime != NSEC_INFINITY && atime >= cutoff) {
643 log_debug("%s \"%s\": access time %s is too new.",
644 is_dir ? "Directory" : "File",
645 sub_path,
646 FORMAT_TIMESTAMP_STYLE(atime / NSEC_PER_USEC, TIMESTAMP_US));
647
648 return false;
649 }
650
651 /*
652 * Note: Unless explicitly specified by the user, "ctime" is ignored
653 * by default for directories, because we change it when deleting.
654 */
655 if (FLAGS_SET(age_by, AGE_BY_CTIME) && ctime != NSEC_INFINITY && ctime >= cutoff) {
656 log_debug("%s \"%s\": change time %s is too new.",
657 is_dir ? "Directory" : "File",
658 sub_path,
659 FORMAT_TIMESTAMP_STYLE(ctime / NSEC_PER_USEC, TIMESTAMP_US));
660
661 return false;
662 }
663
664 if (FLAGS_SET(age_by, AGE_BY_BTIME) && btime != NSEC_INFINITY && btime >= cutoff) {
665 log_debug("%s \"%s\": birth time %s is too new.",
666 is_dir ? "Directory" : "File",
667 sub_path,
668 FORMAT_TIMESTAMP_STYLE(btime / NSEC_PER_USEC, TIMESTAMP_US));
669
670 return false;
671 }
672
673 return true;
674 }
675
676 static int dir_cleanup(
677 Context *c,
678 Item *i,
679 const char *p,
680 DIR *d,
681 nsec_t self_atime_nsec,
682 nsec_t self_mtime_nsec,
683 nsec_t cutoff_nsec,
684 dev_t rootdev_major,
685 dev_t rootdev_minor,
686 bool mountpoint,
687 int maxdepth,
688 bool keep_this_level,
689 AgeBy age_by_file,
690 AgeBy age_by_dir) {
691
692 bool deleted = false;
693 int r = 0;
694
695 assert(c);
696 assert(i);
697 assert(d);
698
699 FOREACH_DIRENT_ALL(de, d, break) {
700 _cleanup_free_ char *sub_path = NULL;
701 nsec_t atime_nsec, mtime_nsec, ctime_nsec, btime_nsec;
702
703 if (dot_or_dot_dot(de->d_name))
704 continue;
705
706 /* If statx() is supported, use it. It's preferable over fstatat() since it tells us
707 * explicitly where we are looking at a mount point, for free as side information. Determining
708 * the same information without statx() is hard, see the complexity of path_is_mount_point(),
709 * and also much slower as it requires a number of syscalls instead of just one. Hence, when
710 * we have modern statx() we use it instead of fstat() and do proper mount point checks,
711 * while on older kernels's well do traditional st_dev based detection of mount points.
712 *
713 * Using statx() for detecting mount points also has the benefit that we handle weird file
714 * systems such as overlayfs better where each file is originating from a different
715 * st_dev. */
716
717 STRUCT_STATX_DEFINE(sx);
718
719 r = statx_fallback(
720 dirfd(d), de->d_name,
721 AT_SYMLINK_NOFOLLOW|AT_NO_AUTOMOUNT,
722 STATX_TYPE|STATX_MODE|STATX_UID|STATX_ATIME|STATX_MTIME|STATX_CTIME|STATX_BTIME,
723 &sx);
724 if (r == -ENOENT)
725 continue;
726 if (r < 0) {
727 /* FUSE, NFS mounts, SELinux might return EACCES */
728 log_full_errno(r == -EACCES ? LOG_DEBUG : LOG_ERR, r,
729 "statx(%s/%s) failed: %m", p, de->d_name);
730 continue;
731 }
732
733 if (FLAGS_SET(sx.stx_attributes_mask, STATX_ATTR_MOUNT_ROOT)) {
734 /* Yay, we have the mount point API, use it */
735 if (FLAGS_SET(sx.stx_attributes, STATX_ATTR_MOUNT_ROOT)) {
736 log_debug("Ignoring \"%s/%s\": different mount points.", p, de->d_name);
737 continue;
738 }
739 } else {
740 /* So we might have statx() but the STATX_ATTR_MOUNT_ROOT flag is not supported, fall
741 * back to traditional stx_dev checking. */
742 if (sx.stx_dev_major != rootdev_major ||
743 sx.stx_dev_minor != rootdev_minor) {
744 log_debug("Ignoring \"%s/%s\": different filesystem.", p, de->d_name);
745 continue;
746 }
747
748 /* Try to detect bind mounts of the same filesystem instance; they do not differ in
749 * device major/minors. This type of query is not supported on all kernels or
750 * filesystem types though. */
751 if (S_ISDIR(sx.stx_mode)) {
752 int q;
753
754 q = fd_is_mount_point(dirfd(d), de->d_name, 0);
755 if (q < 0)
756 log_debug_errno(q, "Failed to determine whether \"%s/%s\" is a mount point, ignoring: %m", p, de->d_name);
757 else if (q > 0) {
758 log_debug("Ignoring \"%s/%s\": different mount of the same filesystem.", p, de->d_name);
759 continue;
760 }
761 }
762 }
763
764 atime_nsec = FLAGS_SET(sx.stx_mask, STATX_ATIME) ? statx_timestamp_load_nsec(&sx.stx_atime) : 0;
765 mtime_nsec = FLAGS_SET(sx.stx_mask, STATX_MTIME) ? statx_timestamp_load_nsec(&sx.stx_mtime) : 0;
766 ctime_nsec = FLAGS_SET(sx.stx_mask, STATX_CTIME) ? statx_timestamp_load_nsec(&sx.stx_ctime) : 0;
767 btime_nsec = FLAGS_SET(sx.stx_mask, STATX_BTIME) ? statx_timestamp_load_nsec(&sx.stx_btime) : 0;
768
769 sub_path = path_join(p, de->d_name);
770 if (!sub_path) {
771 r = log_oom();
772 goto finish;
773 }
774
775 /* Is there an item configured for this path? */
776 if (ordered_hashmap_get(c->items, sub_path)) {
777 log_debug("Ignoring \"%s\": a separate entry exists.", sub_path);
778 continue;
779 }
780
781 if (find_glob(c->globs, sub_path)) {
782 log_debug("Ignoring \"%s\": a separate glob exists.", sub_path);
783 continue;
784 }
785
786 if (S_ISDIR(sx.stx_mode)) {
787 _cleanup_closedir_ DIR *sub_dir = NULL;
788
789 if (mountpoint &&
790 streq(de->d_name, "lost+found") &&
791 sx.stx_uid == 0) {
792 log_debug("Ignoring directory \"%s\".", sub_path);
793 continue;
794 }
795
796 if (maxdepth <= 0)
797 log_warning("Reached max depth on \"%s\".", sub_path);
798 else {
799 int q;
800
801 sub_dir = xopendirat_nomod(dirfd(d), de->d_name);
802 if (!sub_dir) {
803 if (errno != ENOENT)
804 r = log_warning_errno(errno, "Opening directory \"%s\" failed, ignoring: %m", sub_path);
805
806 continue;
807 }
808
809 if (!arg_dry_run &&
810 flock(dirfd(sub_dir), LOCK_EX|LOCK_NB) < 0) {
811 log_debug_errno(errno, "Couldn't acquire shared BSD lock on directory \"%s\", skipping: %m", sub_path);
812 continue;
813 }
814
815 q = dir_cleanup(c, i,
816 sub_path, sub_dir,
817 atime_nsec, mtime_nsec, cutoff_nsec,
818 rootdev_major, rootdev_minor,
819 false, maxdepth-1, false,
820 age_by_file, age_by_dir);
821 if (q < 0)
822 r = q;
823 }
824
825 /* Note: if you are wondering why we don't support the sticky bit for excluding
826 * directories from cleaning like we do it for other file system objects: well, the
827 * sticky bit already has a meaning for directories, so we don't want to overload
828 * that. */
829
830 if (keep_this_level) {
831 log_debug("Keeping directory \"%s\".", sub_path);
832 continue;
833 }
834
835 /*
836 * Check the file timestamps of an entry against the
837 * given cutoff time; delete if it is older.
838 */
839 if (!needs_cleanup(atime_nsec, btime_nsec, ctime_nsec, mtime_nsec,
840 cutoff_nsec, sub_path, age_by_dir, true))
841 continue;
842
843 log_action("Would remove", "Removing", "%s directory \"%s\"", sub_path);
844 if (!arg_dry_run &&
845 unlinkat(dirfd(d), de->d_name, AT_REMOVEDIR) < 0 &&
846 !IN_SET(errno, ENOENT, ENOTEMPTY))
847 r = log_warning_errno(errno, "Failed to remove directory \"%s\", ignoring: %m", sub_path);
848
849 } else {
850 _cleanup_close_ int fd = -EBADF; /* This file descriptor is defined here so that the
851 * lock that is taken below is only dropped _after_
852 * the unlink operation has finished. */
853
854 /* Skip files for which the sticky bit is set. These are semantics we define, and are
855 * unknown elsewhere. See XDG_RUNTIME_DIR specification for details. */
856 if (sx.stx_mode & S_ISVTX) {
857 log_debug("Skipping \"%s\": sticky bit set.", sub_path);
858 continue;
859 }
860
861 if (mountpoint &&
862 S_ISREG(sx.stx_mode) &&
863 sx.stx_uid == 0 &&
864 STR_IN_SET(de->d_name,
865 ".journal",
866 "aquota.user",
867 "aquota.group")) {
868 log_debug("Skipping \"%s\".", sub_path);
869 continue;
870 }
871
872 /* Ignore sockets that are listed in /proc/net/unix */
873 if (S_ISSOCK(sx.stx_mode) && unix_socket_alive(c, sub_path)) {
874 log_debug("Skipping \"%s\": live socket.", sub_path);
875 continue;
876 }
877
878 /* Ignore device nodes */
879 if (S_ISCHR(sx.stx_mode) || S_ISBLK(sx.stx_mode)) {
880 log_debug("Skipping \"%s\": a device.", sub_path);
881 continue;
882 }
883
884 /* Keep files on this level if this was requested */
885 if (keep_this_level) {
886 log_debug("Keeping \"%s\".", sub_path);
887 continue;
888 }
889
890 if (!needs_cleanup(atime_nsec, btime_nsec, ctime_nsec, mtime_nsec,
891 cutoff_nsec, sub_path, age_by_file, false))
892 continue;
893
894 if (!arg_dry_run) {
895 fd = xopenat(dirfd(d), de->d_name, O_RDONLY|O_CLOEXEC|O_NOFOLLOW|O_NOATIME|O_NONBLOCK);
896 if (fd < 0 && !IN_SET(fd, -ENOENT, -ELOOP))
897 log_warning_errno(fd, "Opening file \"%s\" failed, ignoring: %m", sub_path);
898 if (fd >= 0 && flock(fd, LOCK_EX|LOCK_NB) < 0 && errno == EAGAIN) {
899 log_debug_errno(errno, "Couldn't acquire shared BSD lock on file \"%s\", skipping: %m", sub_path);
900 continue;
901 }
902 }
903
904 log_action("Would remove", "Removing", "%s \"%s\"", sub_path);
905 if (!arg_dry_run &&
906 unlinkat(dirfd(d), de->d_name, 0) < 0 &&
907 errno != ENOENT)
908 r = log_warning_errno(errno, "Failed to remove \"%s\", ignoring: %m", sub_path);
909
910 deleted = true;
911 }
912 }
913
914 finish:
915 if (deleted && (self_atime_nsec < NSEC_INFINITY || self_mtime_nsec < NSEC_INFINITY)) {
916 struct timespec ts[2];
917
918 log_action("Would restore", "Restoring",
919 "%s access and modification time on \"%s\": %s, %s",
920 p,
921 FORMAT_TIMESTAMP_STYLE(self_atime_nsec / NSEC_PER_USEC, TIMESTAMP_US),
922 FORMAT_TIMESTAMP_STYLE(self_mtime_nsec / NSEC_PER_USEC, TIMESTAMP_US));
923
924 timespec_store_nsec(ts + 0, self_atime_nsec);
925 timespec_store_nsec(ts + 1, self_mtime_nsec);
926
927 /* Restore original directory timestamps */
928 if (!arg_dry_run &&
929 futimens(dirfd(d), ts) < 0)
930 log_warning_errno(errno, "Failed to revert timestamps of '%s', ignoring: %m", p);
931 }
932
933 return r;
934 }
935
936 static bool dangerous_hardlinks(void) {
937 _cleanup_free_ char *value = NULL;
938 static int cached = -1;
939 int r;
940
941 /* Check whether the fs.protected_hardlinks sysctl is on. If we can't determine it we assume its off,
942 * as that's what the upstream default is. */
943
944 if (cached >= 0)
945 return cached;
946
947 r = read_one_line_file("/proc/sys/fs/protected_hardlinks", &value);
948 if (r < 0) {
949 log_debug_errno(r, "Failed to read fs.protected_hardlinks sysctl: %m");
950 return true;
951 }
952
953 r = parse_boolean(value);
954 if (r < 0) {
955 log_debug_errno(r, "Failed to parse fs.protected_hardlinks sysctl: %m");
956 return true;
957 }
958
959 cached = r == 0;
960 return cached;
961 }
962
963 static bool hardlink_vulnerable(const struct stat *st) {
964 assert(st);
965
966 return !S_ISDIR(st->st_mode) && st->st_nlink > 1 && dangerous_hardlinks();
967 }
968
969 static mode_t process_mask_perms(mode_t mode, mode_t current) {
970
971 if ((current & 0111) == 0)
972 mode &= ~0111;
973 if ((current & 0222) == 0)
974 mode &= ~0222;
975 if ((current & 0444) == 0)
976 mode &= ~0444;
977 if (!S_ISDIR(current))
978 mode &= ~07000; /* remove sticky/sgid/suid bit, unless directory */
979
980 return mode;
981 }
982
983 static int fd_set_perms(
984 Context *c,
985 Item *i,
986 int fd,
987 const char *path,
988 const struct stat *st,
989 CreationMode creation) {
990
991 bool do_chown, do_chmod;
992 struct stat stbuf;
993 mode_t new_mode;
994 uid_t new_uid;
995 gid_t new_gid;
996 int r;
997
998 assert(c);
999 assert(i);
1000 assert(fd >= 0);
1001 assert(path);
1002
1003 if (!i->mode_set && !i->uid_set && !i->gid_set)
1004 goto shortcut;
1005
1006 if (!st) {
1007 if (fstat(fd, &stbuf) < 0)
1008 return log_error_errno(errno, "fstat(%s) failed: %m", path);
1009 st = &stbuf;
1010 }
1011
1012 if (hardlink_vulnerable(st))
1013 return log_error_errno(SYNTHETIC_ERRNO(EPERM),
1014 "Refusing to set permissions on hardlinked file %s while the fs.protected_hardlinks sysctl is turned off.",
1015 path);
1016 new_uid = i->uid_set && (creation != CREATION_EXISTING || !i->uid_only_create) ? i->uid : st->st_uid;
1017 new_gid = i->gid_set && (creation != CREATION_EXISTING || !i->gid_only_create) ? i->gid : st->st_gid;
1018
1019 /* Do we need a chown()? */
1020 do_chown = (new_uid != st->st_uid) || (new_gid != st->st_gid);
1021
1022 /* Calculate the mode to apply */
1023 new_mode = i->mode_set && (creation != CREATION_EXISTING || !i->mode_only_create) ?
1024 (i->mask_perms ? process_mask_perms(i->mode, st->st_mode) : i->mode) :
1025 (st->st_mode & 07777);
1026
1027 do_chmod = ((new_mode ^ st->st_mode) & 07777) != 0;
1028
1029 if (do_chmod && do_chown) {
1030 /* Before we issue the chmod() let's reduce the access mode to the common bits of the old and
1031 * the new mode. That way there's no time window where the file exists under the old owner
1032 * with more than the old access modes — and not under the new owner with more than the new
1033 * access modes either. */
1034
1035 if (S_ISLNK(st->st_mode))
1036 log_debug("Skipping temporary mode fix for symlink %s.", path);
1037 else {
1038 mode_t m = new_mode & st->st_mode; /* Mask new mode by old mode */
1039
1040 if (((m ^ st->st_mode) & 07777) == 0)
1041 log_debug("\"%s\" matches temporary mode %o already.", path, m);
1042 else {
1043 log_action("Would temporarily change", "Temporarily changing",
1044 "%s \"%s\" to mode %o", path, m);
1045 if (!arg_dry_run) {
1046 r = fchmod_opath(fd, m);
1047 if (r < 0)
1048 return log_error_errno(r, "fchmod() of %s failed: %m", path);
1049 }
1050 }
1051 }
1052 }
1053
1054 if (do_chown) {
1055 log_action("Would change", "Changing",
1056 "%s \"%s\" to owner "UID_FMT":"GID_FMT, path, new_uid, new_gid);
1057
1058 if (!arg_dry_run &&
1059 fchownat(fd, "",
1060 new_uid != st->st_uid ? new_uid : UID_INVALID,
1061 new_gid != st->st_gid ? new_gid : GID_INVALID,
1062 AT_EMPTY_PATH) < 0)
1063 return log_error_errno(errno, "fchownat() of %s failed: %m", path);
1064 }
1065
1066 /* Now, apply the final mode. We do this in two cases: when the user set a mode explicitly, or after a
1067 * chown(), since chown()'s mangle the access mode in regards to sgid/suid in some conditions. */
1068 if (do_chmod || do_chown) {
1069 if (S_ISLNK(st->st_mode))
1070 log_debug("Skipping mode fix for symlink %s.", path);
1071 else {
1072 log_action("Would change", "Changing", "%s \"%s\" to mode %o", path, new_mode);
1073 if (!arg_dry_run) {
1074 r = fchmod_opath(fd, new_mode);
1075 if (r < 0)
1076 return log_error_errno(r, "fchmod() of %s failed: %m", path);
1077 }
1078 }
1079 }
1080
1081 shortcut:
1082 return label_fix_full(fd, /* inode_path= */ NULL, /* label_path= */ path, 0);
1083 }
1084
1085 static int path_open_parent_safe(const char *path, bool allow_failure) {
1086 _cleanup_free_ char *dn = NULL;
1087 int r, fd;
1088
1089 if (!path_is_normalized(path))
1090 return log_full_errno(allow_failure ? LOG_INFO : LOG_ERR,
1091 SYNTHETIC_ERRNO(EINVAL),
1092 "Failed to open parent of '%s': path not normalized%s.",
1093 path,
1094 allow_failure ? ", ignoring" : "");
1095
1096 r = path_extract_directory(path, &dn);
1097 if (r < 0)
1098 return log_full_errno(allow_failure ? LOG_INFO : LOG_ERR,
1099 r,
1100 "Unable to determine parent directory of '%s'%s: %m",
1101 path,
1102 allow_failure ? ", ignoring" : "");
1103
1104 r = chase(dn, arg_root, allow_failure ? CHASE_SAFE : CHASE_SAFE|CHASE_WARN, NULL, &fd);
1105 if (r == -ENOLINK) /* Unsafe symlink: already covered by CHASE_WARN */
1106 return r;
1107 if (r < 0)
1108 return log_full_errno(allow_failure ? LOG_INFO : LOG_ERR,
1109 r,
1110 "Failed to open path '%s'%s: %m",
1111 dn,
1112 allow_failure ? ", ignoring" : "");
1113
1114 return fd;
1115 }
1116
1117 static int path_open_safe(const char *path) {
1118 int r, fd;
1119
1120 /* path_open_safe() returns a file descriptor opened with O_PATH after
1121 * verifying that the path doesn't contain unsafe transitions, except
1122 * for its final component as the function does not follow symlink. */
1123
1124 assert(path);
1125
1126 if (!path_is_normalized(path))
1127 return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "Failed to open invalid path '%s'.", path);
1128
1129 r = chase(path, arg_root, CHASE_SAFE|CHASE_WARN|CHASE_NOFOLLOW, NULL, &fd);
1130 if (r == -ENOLINK)
1131 return r; /* Unsafe symlink: already covered by CHASE_WARN */
1132 if (r < 0)
1133 return log_error_errno(r, "Failed to open path %s: %m", path);
1134
1135 return fd;
1136 }
1137
1138 static int path_set_perms(
1139 Context *c,
1140 Item *i,
1141 const char *path,
1142 CreationMode creation) {
1143
1144 _cleanup_close_ int fd = -EBADF;
1145
1146 assert(c);
1147 assert(i);
1148 assert(path);
1149
1150 fd = path_open_safe(path);
1151 if (fd < 0)
1152 return fd;
1153
1154 return fd_set_perms(c, i, fd, path, /* st= */ NULL, creation);
1155 }
1156
1157 static int parse_xattrs_from_arg(Item *i) {
1158 const char *p;
1159 int r;
1160
1161 assert(i);
1162
1163 assert_se(p = i->argument);
1164 for (;;) {
1165 _cleanup_free_ char *name = NULL, *value = NULL, *xattr = NULL;
1166
1167 r = extract_first_word(&p, &xattr, NULL, EXTRACT_UNQUOTE|EXTRACT_CUNESCAPE);
1168 if (r < 0)
1169 log_warning_errno(r, "Failed to parse extended attribute '%s', ignoring: %m", p);
1170 if (r <= 0)
1171 break;
1172
1173 r = split_pair(xattr, "=", &name, &value);
1174 if (r < 0) {
1175 log_warning_errno(r, "Failed to parse extended attribute, ignoring: %s", xattr);
1176 continue;
1177 }
1178
1179 if (isempty(name) || isempty(value)) {
1180 log_warning("Malformed extended attribute found, ignoring: %s", xattr);
1181 continue;
1182 }
1183
1184 if (strv_push_pair(&i->xattrs, name, value) < 0)
1185 return log_oom();
1186
1187 name = value = NULL;
1188 }
1189
1190 return 0;
1191 }
1192
1193 static int fd_set_xattrs(
1194 Context *c,
1195 Item *i,
1196 int fd,
1197 const char *path,
1198 const struct stat *st,
1199 CreationMode creation) {
1200
1201 assert(c);
1202 assert(i);
1203 assert(fd >= 0);
1204 assert(path);
1205
1206 STRV_FOREACH_PAIR(name, value, i->xattrs) {
1207 log_action("Would set", "Setting",
1208 "%s extended attribute '%s=%s' on %s", *name, *value, path);
1209
1210 if (!arg_dry_run &&
1211 setxattr(FORMAT_PROC_FD_PATH(fd), *name, *value, strlen(*value), 0) < 0)
1212 return log_error_errno(errno, "Setting extended attribute %s=%s on %s failed: %m",
1213 *name, *value, path);
1214 }
1215 return 0;
1216 }
1217
1218 static int path_set_xattrs(
1219 Context *c,
1220 Item *i,
1221 const char *path,
1222 CreationMode creation) {
1223
1224 _cleanup_close_ int fd = -EBADF;
1225
1226 assert(c);
1227 assert(i);
1228 assert(path);
1229
1230 fd = path_open_safe(path);
1231 if (fd < 0)
1232 return fd;
1233
1234 return fd_set_xattrs(c, i, fd, path, /* st = */ NULL, creation);
1235 }
1236
1237 static int parse_acls_from_arg(Item *item) {
1238 #if HAVE_ACL
1239 int r;
1240
1241 assert(item);
1242
1243 /* If append_or_force (= modify) is set, we will not modify the acl
1244 * afterwards, so the mask can be added now if necessary. */
1245
1246 r = parse_acl(item->argument, &item->acl_access, &item->acl_access_exec,
1247 &item->acl_default, !item->append_or_force);
1248 if (r < 0)
1249 log_full_errno(arg_graceful && IN_SET(r, -EINVAL, -ENOENT, -ESRCH) ? LOG_DEBUG : LOG_WARNING,
1250 r, "Failed to parse ACL \"%s\", ignoring: %m", item->argument);
1251 #else
1252 log_warning("ACLs are not supported, ignoring.");
1253 #endif
1254
1255 return 0;
1256 }
1257
1258 #if HAVE_ACL
1259 static int parse_acl_cond_exec(
1260 const char *path,
1261 acl_t access, /* could be empty (NULL) */
1262 acl_t cond_exec,
1263 const struct stat *st,
1264 bool append,
1265 acl_t *ret) {
1266
1267 _cleanup_(acl_freep) acl_t parsed = NULL;
1268 acl_entry_t entry;
1269 acl_permset_t permset;
1270 bool has_exec;
1271 int r;
1272
1273 assert(path);
1274 assert(ret);
1275 assert(st);
1276
1277 parsed = access ? acl_dup(access) : acl_init(0);
1278 if (!parsed)
1279 return -errno;
1280
1281 /* Since we substitute 'X' with 'x' in parse_acl(), we just need to copy the entries over
1282 * for directories */
1283 if (S_ISDIR(st->st_mode)) {
1284 for (r = acl_get_entry(cond_exec, ACL_FIRST_ENTRY, &entry);
1285 r > 0;
1286 r = acl_get_entry(cond_exec, ACL_NEXT_ENTRY, &entry)) {
1287
1288 acl_entry_t parsed_entry;
1289
1290 if (acl_create_entry(&parsed, &parsed_entry) < 0)
1291 return -errno;
1292
1293 if (acl_copy_entry(parsed_entry, entry) < 0)
1294 return -errno;
1295 }
1296 if (r < 0)
1297 return -errno;
1298
1299 goto finish;
1300 }
1301
1302 has_exec = st->st_mode & S_IXUSR;
1303
1304 if (!has_exec && append) {
1305 _cleanup_(acl_freep) acl_t old = NULL;
1306
1307 old = acl_get_file(path, ACL_TYPE_ACCESS);
1308 if (!old)
1309 return -errno;
1310
1311 for (r = acl_get_entry(old, ACL_FIRST_ENTRY, &entry);
1312 r > 0;
1313 r = acl_get_entry(old, ACL_NEXT_ENTRY, &entry)) {
1314
1315 if (acl_get_permset(entry, &permset) < 0)
1316 return -errno;
1317
1318 r = acl_get_perm(permset, ACL_EXECUTE);
1319 if (r < 0)
1320 return -errno;
1321 if (r > 0) {
1322 has_exec = true;
1323 break;
1324 }
1325 }
1326 if (r < 0)
1327 return -errno;
1328 }
1329
1330 /* Check if we're about to set the execute bit in acl_access */
1331 if (!has_exec && access) {
1332 for (r = acl_get_entry(access, ACL_FIRST_ENTRY, &entry);
1333 r > 0;
1334 r = acl_get_entry(access, ACL_NEXT_ENTRY, &entry)) {
1335
1336 if (acl_get_permset(entry, &permset) < 0)
1337 return -errno;
1338
1339 r = acl_get_perm(permset, ACL_EXECUTE);
1340 if (r < 0)
1341 return -errno;
1342 if (r > 0) {
1343 has_exec = true;
1344 break;
1345 }
1346 }
1347 if (r < 0)
1348 return -errno;
1349 }
1350
1351 for (r = acl_get_entry(cond_exec, ACL_FIRST_ENTRY, &entry);
1352 r > 0;
1353 r = acl_get_entry(cond_exec, ACL_NEXT_ENTRY, &entry)) {
1354
1355 acl_entry_t parsed_entry;
1356
1357 if (acl_create_entry(&parsed, &parsed_entry) < 0)
1358 return -errno;
1359
1360 if (acl_copy_entry(parsed_entry, entry) < 0)
1361 return -errno;
1362
1363 if (!has_exec) {
1364 if (acl_get_permset(parsed_entry, &permset) < 0)
1365 return -errno;
1366
1367 if (acl_delete_perm(permset, ACL_EXECUTE) < 0)
1368 return -errno;
1369 }
1370 }
1371 if (r < 0)
1372 return -errno;
1373
1374 finish:
1375 if (!append) { /* want_mask = true */
1376 r = calc_acl_mask_if_needed(&parsed);
1377 if (r < 0)
1378 return r;
1379 }
1380
1381 *ret = TAKE_PTR(parsed);
1382
1383 return 0;
1384 }
1385
1386 static int path_set_acl(
1387 Context *c,
1388 const char *path,
1389 const char *pretty,
1390 acl_type_t type,
1391 acl_t acl,
1392 bool modify) {
1393
1394 _cleanup_(acl_free_charpp) char *t = NULL;
1395 _cleanup_(acl_freep) acl_t dup = NULL;
1396 int r;
1397
1398 assert(c);
1399
1400 /* Returns 0 for success, positive error if already warned, negative error otherwise. */
1401
1402 if (modify) {
1403 r = acls_for_file(path, type, acl, &dup);
1404 if (r < 0)
1405 return r;
1406
1407 r = calc_acl_mask_if_needed(&dup);
1408 if (r < 0)
1409 return r;
1410 } else {
1411 dup = acl_dup(acl);
1412 if (!dup)
1413 return -errno;
1414
1415 /* the mask was already added earlier if needed */
1416 }
1417
1418 r = add_base_acls_if_needed(&dup, path);
1419 if (r < 0)
1420 return r;
1421
1422 t = acl_to_any_text(dup, NULL, ',', TEXT_ABBREVIATE);
1423 log_action("Would set", "Setting",
1424 "%s %s ACL %s on %s",
1425 type == ACL_TYPE_ACCESS ? "access" : "default",
1426 strna(t), pretty);
1427
1428 if (!arg_dry_run &&
1429 acl_set_file(path, type, dup) < 0) {
1430 if (ERRNO_IS_NOT_SUPPORTED(errno))
1431 /* No error if filesystem doesn't support ACLs. Return negative. */
1432 return -errno;
1433 else
1434 /* Return positive to indicate we already warned */
1435 return -log_error_errno(errno,
1436 "Setting %s ACL \"%s\" on %s failed: %m",
1437 type == ACL_TYPE_ACCESS ? "access" : "default",
1438 strna(t), pretty);
1439 }
1440 return 0;
1441 }
1442 #endif
1443
1444 static int fd_set_acls(
1445 Context *c,
1446 Item *item,
1447 int fd,
1448 const char *path,
1449 const struct stat *st,
1450 CreationMode creation) {
1451
1452 int r = 0;
1453 #if HAVE_ACL
1454 _cleanup_(acl_freep) acl_t access_with_exec_parsed = NULL;
1455 struct stat stbuf;
1456
1457 assert(c);
1458 assert(item);
1459 assert(fd >= 0);
1460 assert(path);
1461
1462 if (!st) {
1463 if (fstat(fd, &stbuf) < 0)
1464 return log_error_errno(errno, "fstat(%s) failed: %m", path);
1465 st = &stbuf;
1466 }
1467
1468 if (hardlink_vulnerable(st))
1469 return log_error_errno(SYNTHETIC_ERRNO(EPERM),
1470 "Refusing to set ACLs on hardlinked file %s while the fs.protected_hardlinks sysctl is turned off.",
1471 path);
1472
1473 if (S_ISLNK(st->st_mode)) {
1474 log_debug("Skipping ACL fix for symlink %s.", path);
1475 return 0;
1476 }
1477
1478 if (item->acl_access_exec) {
1479 r = parse_acl_cond_exec(FORMAT_PROC_FD_PATH(fd),
1480 item->acl_access,
1481 item->acl_access_exec,
1482 st,
1483 item->append_or_force,
1484 &access_with_exec_parsed);
1485 if (r < 0)
1486 return log_error_errno(r, "Failed to parse conditionalized execute bit for \"%s\": %m", path);
1487
1488 r = path_set_acl(c, FORMAT_PROC_FD_PATH(fd), path, ACL_TYPE_ACCESS, access_with_exec_parsed, item->append_or_force);
1489 } else if (item->acl_access)
1490 r = path_set_acl(c, FORMAT_PROC_FD_PATH(fd), path, ACL_TYPE_ACCESS, item->acl_access, item->append_or_force);
1491
1492 /* set only default acls to folders */
1493 if (r == 0 && item->acl_default && S_ISDIR(st->st_mode))
1494 r = path_set_acl(c, FORMAT_PROC_FD_PATH(fd), path, ACL_TYPE_DEFAULT, item->acl_default, item->append_or_force);
1495
1496 if (ERRNO_IS_NOT_SUPPORTED(r)) {
1497 log_debug_errno(r, "ACLs not supported by file system at %s", path);
1498 return 0;
1499 }
1500
1501 if (r > 0)
1502 return -r; /* already warned in path_set_acl */
1503
1504 /* The above procfs paths don't work if /proc is not mounted. */
1505 if (r == -ENOENT && proc_mounted() == 0)
1506 r = -ENOSYS;
1507
1508 if (r < 0)
1509 return log_error_errno(r, "ACL operation on \"%s\" failed: %m", path);
1510 #endif
1511 return r;
1512 }
1513
1514 static int path_set_acls(
1515 Context *c,
1516 Item *item,
1517 const char *path,
1518 CreationMode creation) {
1519
1520 int r = 0;
1521 #if HAVE_ACL
1522 _cleanup_close_ int fd = -EBADF;
1523
1524 assert(c);
1525 assert(item);
1526 assert(path);
1527
1528 fd = path_open_safe(path);
1529 if (fd < 0)
1530 return fd;
1531
1532 r = fd_set_acls(c, item, fd, path, /* st= */ NULL, creation);
1533 #endif
1534 return r;
1535 }
1536
1537 static int parse_attribute_from_arg(Item *item) {
1538 static const struct {
1539 char character;
1540 unsigned value;
1541 } attributes[] = {
1542 { 'A', FS_NOATIME_FL }, /* do not update atime */
1543 { 'S', FS_SYNC_FL }, /* Synchronous updates */
1544 { 'D', FS_DIRSYNC_FL }, /* dirsync behaviour (directories only) */
1545 { 'a', FS_APPEND_FL }, /* writes to file may only append */
1546 { 'c', FS_COMPR_FL }, /* Compress file */
1547 { 'd', FS_NODUMP_FL }, /* do not dump file */
1548 { 'e', FS_EXTENT_FL }, /* Extents */
1549 { 'i', FS_IMMUTABLE_FL }, /* Immutable file */
1550 { 'j', FS_JOURNAL_DATA_FL }, /* Reserved for ext3 */
1551 { 's', FS_SECRM_FL }, /* Secure deletion */
1552 { 'u', FS_UNRM_FL }, /* Undelete */
1553 { 't', FS_NOTAIL_FL }, /* file tail should not be merged */
1554 { 'T', FS_TOPDIR_FL }, /* Top of directory hierarchies */
1555 { 'C', FS_NOCOW_FL }, /* Do not cow file */
1556 { 'P', FS_PROJINHERIT_FL }, /* Inherit the quota project ID */
1557 };
1558
1559 enum {
1560 MODE_ADD,
1561 MODE_DEL,
1562 MODE_SET
1563 } mode = MODE_ADD;
1564
1565 unsigned value = 0, mask = 0;
1566 const char *p;
1567
1568 assert(item);
1569
1570 p = item->argument;
1571 if (p) {
1572 if (*p == '+') {
1573 mode = MODE_ADD;
1574 p++;
1575 } else if (*p == '-') {
1576 mode = MODE_DEL;
1577 p++;
1578 } else if (*p == '=') {
1579 mode = MODE_SET;
1580 p++;
1581 }
1582 }
1583
1584 if (isempty(p) && mode != MODE_SET)
1585 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
1586 "Setting file attribute on '%s' needs an attribute specification.",
1587 item->path);
1588
1589 for (; p && *p ; p++) {
1590 unsigned i, v;
1591
1592 for (i = 0; i < ELEMENTSOF(attributes); i++)
1593 if (*p == attributes[i].character)
1594 break;
1595
1596 if (i >= ELEMENTSOF(attributes))
1597 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
1598 "Unknown file attribute '%c' on '%s'.", *p, item->path);
1599
1600 v = attributes[i].value;
1601
1602 SET_FLAG(value, v, IN_SET(mode, MODE_ADD, MODE_SET));
1603
1604 mask |= v;
1605 }
1606
1607 if (mode == MODE_SET)
1608 mask |= CHATTR_ALL_FL;
1609
1610 assert(mask != 0);
1611
1612 item->attribute_mask = mask;
1613 item->attribute_value = value;
1614 item->attribute_set = true;
1615
1616 return 0;
1617 }
1618
1619 static int fd_set_attribute(
1620 Context *c,
1621 Item *item,
1622 int fd,
1623 const char *path,
1624 const struct stat *st,
1625 CreationMode creation) {
1626
1627 struct stat stbuf;
1628 unsigned f;
1629 int r;
1630
1631 assert(c);
1632 assert(item);
1633 assert(fd >= 0);
1634 assert(path);
1635
1636 if (!item->attribute_set || item->attribute_mask == 0)
1637 return 0;
1638
1639 if (!st) {
1640 if (fstat(fd, &stbuf) < 0)
1641 return log_error_errno(errno, "fstat(%s) failed: %m", path);
1642 st = &stbuf;
1643 }
1644
1645 /* Issuing the file attribute ioctls on device nodes is not safe, as that will be delivered to the
1646 * drivers, not the file system containing the device node. */
1647 if (!S_ISREG(st->st_mode) && !S_ISDIR(st->st_mode))
1648 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
1649 "Setting file flags is only supported on regular files and directories, cannot set on '%s'.",
1650 path);
1651
1652 f = item->attribute_value & item->attribute_mask;
1653
1654 /* Mask away directory-specific flags */
1655 if (!S_ISDIR(st->st_mode))
1656 f &= ~FS_DIRSYNC_FL;
1657
1658 log_action("Would try to set", "Trying to set",
1659 "%s file attributes 0x%08x on %s",
1660 f & item->attribute_mask,
1661 path);
1662
1663 if (!arg_dry_run) {
1664 _cleanup_close_ int procfs_fd = -EBADF;
1665
1666 procfs_fd = fd_reopen(fd, O_RDONLY|O_CLOEXEC|O_NOATIME);
1667 if (procfs_fd < 0)
1668 return log_error_errno(procfs_fd, "Failed to reopen '%s': %m", path);
1669
1670 unsigned previous, current;
1671 r = chattr_full(procfs_fd, NULL, f, item->attribute_mask, &previous, &current, CHATTR_FALLBACK_BITWISE);
1672 if (r == -ENOANO)
1673 log_warning("Cannot set file attributes for '%s', maybe due to incompatibility in specified attributes, "
1674 "previous=0x%08x, current=0x%08x, expected=0x%08x, ignoring.",
1675 path, previous, current, (previous & ~item->attribute_mask) | (f & item->attribute_mask));
1676 else if (r < 0)
1677 log_full_errno(ERRNO_IS_NOT_SUPPORTED(r) ? LOG_DEBUG : LOG_WARNING, r,
1678 "Cannot set file attributes for '%s', value=0x%08x, mask=0x%08x, ignoring: %m",
1679 path, item->attribute_value, item->attribute_mask);
1680 }
1681
1682 return 0;
1683 }
1684
1685 static int path_set_attribute(
1686 Context *c,
1687 Item *item,
1688 const char *path,
1689 CreationMode creation) {
1690
1691 _cleanup_close_ int fd = -EBADF;
1692
1693 assert(c);
1694 assert(item);
1695
1696 if (!item->attribute_set || item->attribute_mask == 0)
1697 return 0;
1698
1699 fd = path_open_safe(path);
1700 if (fd < 0)
1701 return fd;
1702
1703 return fd_set_attribute(c, item, fd, path, /* st= */ NULL, creation);
1704 }
1705
1706 static int write_argument_data(Item *i, int fd, const char *path) {
1707 int r;
1708
1709 assert(i);
1710 assert(fd >= 0);
1711 assert(path);
1712
1713 if (item_binary_argument_size(i) == 0)
1714 return 0;
1715
1716 assert(item_binary_argument(i));
1717
1718 log_action("Would write", "Writing", "%s to \"%s\"", path);
1719
1720 if (!arg_dry_run) {
1721 r = loop_write(fd, item_binary_argument(i), item_binary_argument_size(i));
1722 if (r < 0)
1723 return log_error_errno(r, "Failed to write file \"%s\": %m", path);
1724 }
1725
1726 return 0;
1727 }
1728
1729 static int write_one_file(Context *c, Item *i, const char *path, CreationMode creation) {
1730 _cleanup_close_ int fd = -EBADF, dir_fd = -EBADF;
1731 _cleanup_free_ char *bn = NULL;
1732 int r;
1733
1734 assert(c);
1735 assert(i);
1736 assert(path);
1737 assert(i->type == WRITE_FILE);
1738
1739 r = path_extract_filename(path, &bn);
1740 if (r < 0)
1741 return log_error_errno(r, "Failed to extract filename from path '%s': %m", path);
1742 if (r == O_DIRECTORY)
1743 return log_error_errno(SYNTHETIC_ERRNO(EISDIR), "Cannot open path '%s' for writing, is a directory.", path);
1744
1745 /* Validate the path and keep the fd on the directory for opening the file so we're sure that it
1746 * can't be changed behind our back. */
1747 dir_fd = path_open_parent_safe(path, i->allow_failure);
1748 if (dir_fd < 0)
1749 return dir_fd;
1750
1751 /* Follow symlinks. Open with O_PATH in dry-run mode to make sure we don't use the path inadvertently. */
1752 int flags = O_NONBLOCK | O_CLOEXEC | O_WRONLY | O_NOCTTY | i->append_or_force * O_APPEND | arg_dry_run * O_PATH;
1753 fd = openat(dir_fd, bn, flags, i->mode);
1754 if (fd < 0) {
1755 if (errno == ENOENT) {
1756 log_debug_errno(errno, "Not writing missing file \"%s\": %m", path);
1757 return 0;
1758 }
1759
1760 if (i->allow_failure)
1761 return log_debug_errno(errno, "Failed to open file \"%s\", ignoring: %m", path);
1762
1763 return log_error_errno(errno, "Failed to open file \"%s\": %m", path);
1764 }
1765
1766 /* 'w' is allowed to write into any kind of files. */
1767
1768 r = write_argument_data(i, fd, path);
1769 if (r < 0)
1770 return r;
1771
1772 return fd_set_perms(c, i, fd, path, NULL, creation);
1773 }
1774
1775 static int create_file(
1776 Context *c,
1777 Item *i,
1778 const char *path) {
1779
1780 _cleanup_close_ int fd = -EBADF, dir_fd = -EBADF;
1781 _cleanup_free_ char *bn = NULL;
1782 struct stat stbuf, *st = NULL;
1783 CreationMode creation;
1784 int r = 0;
1785
1786 assert(c);
1787 assert(i);
1788 assert(path);
1789 assert(i->type == CREATE_FILE);
1790
1791 /* 'f' operates on regular files exclusively. */
1792
1793 r = path_extract_filename(path, &bn);
1794 if (r < 0)
1795 return log_error_errno(r, "Failed to extract filename from path '%s': %m", path);
1796 if (r == O_DIRECTORY)
1797 return log_error_errno(SYNTHETIC_ERRNO(EISDIR), "Cannot open path '%s' for writing, is a directory.", path);
1798
1799 if (arg_dry_run) {
1800 log_info("Would create file %s", path);
1801 return 0;
1802
1803 /* The opening of the directory below would fail if it doesn't exist,
1804 * so log and exit before even trying to do that. */
1805 }
1806
1807 /* Validate the path and keep the fd on the directory for opening the file so we're sure that it
1808 * can't be changed behind our back. */
1809 dir_fd = path_open_parent_safe(path, i->allow_failure);
1810 if (dir_fd < 0)
1811 return dir_fd;
1812
1813 WITH_UMASK(0000) {
1814 mac_selinux_create_file_prepare(path, S_IFREG);
1815 fd = RET_NERRNO(openat(dir_fd, bn, O_CREAT|O_EXCL|O_NOFOLLOW|O_NONBLOCK|O_CLOEXEC|O_WRONLY|O_NOCTTY, i->mode));
1816 mac_selinux_create_file_clear();
1817 }
1818
1819 if (fd < 0) {
1820 /* Even on a read-only filesystem, open(2) returns EEXIST if the file already exists. It
1821 * returns EROFS only if it needs to create the file. */
1822 if (fd != -EEXIST)
1823 return log_error_errno(fd, "Failed to create file %s: %m", path);
1824
1825 /* Re-open the file. At that point it must exist since open(2) failed with EEXIST. We still
1826 * need to check if the perms/mode need to be changed. For read-only filesystems, we let
1827 * fd_set_perms() report the error if the perms need to be modified. */
1828 fd = openat(dir_fd, bn, O_NOFOLLOW|O_CLOEXEC|O_PATH, i->mode);
1829 if (fd < 0)
1830 return log_error_errno(errno, "Failed to reopen file %s: %m", path);
1831
1832 if (fstat(fd, &stbuf) < 0)
1833 return log_error_errno(errno, "stat(%s) failed: %m", path);
1834
1835 if (!S_ISREG(stbuf.st_mode))
1836 return log_error_errno(SYNTHETIC_ERRNO(EEXIST),
1837 "%s exists and is not a regular file.",
1838 path);
1839
1840 st = &stbuf;
1841 creation = CREATION_EXISTING;
1842 } else {
1843 r = write_argument_data(i, fd, path);
1844 if (r < 0)
1845 return r;
1846
1847 creation = CREATION_NORMAL;
1848 }
1849
1850 return fd_set_perms(c, i, fd, path, st, creation);
1851 }
1852
1853 static int truncate_file(
1854 Context *c,
1855 Item *i,
1856 const char *path) {
1857
1858 _cleanup_close_ int fd = -EBADF, dir_fd = -EBADF;
1859 _cleanup_free_ char *bn = NULL;
1860 struct stat stbuf, *st = NULL;
1861 CreationMode creation;
1862 bool erofs = false;
1863 int r = 0;
1864
1865 assert(c);
1866 assert(i);
1867 assert(path);
1868 assert(i->type == TRUNCATE_FILE || (i->type == CREATE_FILE && i->append_or_force));
1869
1870 /* We want to operate on regular file exclusively especially since O_TRUNC is unspecified if the file
1871 * is neither a regular file nor a fifo nor a terminal device. Therefore we first open the file and
1872 * make sure it's a regular one before truncating it. */
1873
1874 r = path_extract_filename(path, &bn);
1875 if (r < 0)
1876 return log_error_errno(r, "Failed to extract filename from path '%s': %m", path);
1877 if (r == O_DIRECTORY)
1878 return log_error_errno(SYNTHETIC_ERRNO(EISDIR), "Cannot open path '%s' for truncation, is a directory.", path);
1879
1880 /* Validate the path and keep the fd on the directory for opening the file so we're sure that it
1881 * can't be changed behind our back. */
1882 dir_fd = path_open_parent_safe(path, i->allow_failure);
1883 if (dir_fd < 0)
1884 return dir_fd;
1885
1886 if (arg_dry_run) {
1887 log_info("Would truncate %s", path);
1888 return 0;
1889 }
1890
1891 creation = CREATION_EXISTING;
1892 fd = RET_NERRNO(openat(dir_fd, bn, O_NOFOLLOW|O_NONBLOCK|O_CLOEXEC|O_WRONLY|O_NOCTTY, i->mode));
1893 if (fd == -ENOENT) {
1894 creation = CREATION_NORMAL; /* Didn't work without O_CREATE, try again with */
1895
1896 WITH_UMASK(0000) {
1897 mac_selinux_create_file_prepare(path, S_IFREG);
1898 fd = RET_NERRNO(openat(dir_fd, bn, O_CREAT|O_NOFOLLOW|O_NONBLOCK|O_CLOEXEC|O_WRONLY|O_NOCTTY, i->mode));
1899 mac_selinux_create_file_clear();
1900 }
1901 }
1902
1903 if (fd < 0) {
1904 if (fd != -EROFS)
1905 return log_error_errno(fd, "Failed to open/create file %s: %m", path);
1906
1907 /* On a read-only filesystem, we don't want to fail if the target is already empty and the
1908 * perms are set. So we still proceed with the sanity checks and let the remaining operations
1909 * fail with EROFS if they try to modify the target file. */
1910
1911 fd = openat(dir_fd, bn, O_NOFOLLOW|O_CLOEXEC|O_PATH, i->mode);
1912 if (fd < 0) {
1913 if (errno == ENOENT)
1914 return log_error_errno(SYNTHETIC_ERRNO(EROFS),
1915 "Cannot create file %s on a read-only file system.",
1916 path);
1917
1918 return log_error_errno(errno, "Failed to reopen file %s: %m", path);
1919 }
1920
1921 erofs = true;
1922 creation = CREATION_EXISTING;
1923 }
1924
1925 if (fstat(fd, &stbuf) < 0)
1926 return log_error_errno(errno, "stat(%s) failed: %m", path);
1927
1928 if (!S_ISREG(stbuf.st_mode))
1929 return log_error_errno(SYNTHETIC_ERRNO(EEXIST),
1930 "%s exists and is not a regular file.",
1931 path);
1932
1933 if (stbuf.st_size > 0) {
1934 if (ftruncate(fd, 0) < 0) {
1935 r = erofs ? -EROFS : -errno;
1936 return log_error_errno(r, "Failed to truncate file %s: %m", path);
1937 }
1938 } else
1939 st = &stbuf;
1940
1941 log_debug("\"%s\" has been created.", path);
1942
1943 if (item_binary_argument(i)) {
1944 r = write_argument_data(i, fd, path);
1945 if (r < 0)
1946 return r;
1947 }
1948
1949 return fd_set_perms(c, i, fd, path, st, creation);
1950 }
1951
1952 static int copy_files(Context *c, Item *i) {
1953 _cleanup_close_ int dfd = -EBADF, fd = -EBADF;
1954 _cleanup_free_ char *bn = NULL;
1955 struct stat st, a;
1956 int r;
1957
1958 log_action("Would copy", "Copying", "%s tree \"%s\" to \"%s\"", i->argument, i->path);
1959 if (arg_dry_run)
1960 return 0;
1961
1962 r = path_extract_filename(i->path, &bn);
1963 if (r < 0)
1964 return log_error_errno(r, "Failed to extract filename from path '%s': %m", i->path);
1965
1966 /* Validate the path and use the returned directory fd for copying the target so we're sure that the
1967 * path can't be changed behind our back. */
1968 dfd = path_open_parent_safe(i->path, i->allow_failure);
1969 if (dfd < 0)
1970 return dfd;
1971
1972 r = copy_tree_at(AT_FDCWD, i->argument,
1973 dfd, bn,
1974 i->uid_set ? i->uid : UID_INVALID,
1975 i->gid_set ? i->gid : GID_INVALID,
1976 COPY_REFLINK | ((i->append_or_force) ? COPY_MERGE : COPY_MERGE_EMPTY) | COPY_MAC_CREATE | COPY_HARDLINKS,
1977 NULL, NULL);
1978
1979 fd = openat(dfd, bn, O_NOFOLLOW|O_CLOEXEC|O_PATH);
1980 if (fd < 0) {
1981 if (r < 0) /* Look at original error first */
1982 return log_error_errno(r, "Failed to copy files to %s: %m", i->path);
1983
1984 return log_error_errno(errno, "Failed to openat(%s): %m", i->path);
1985 }
1986
1987 if (fstat(fd, &st) < 0)
1988 return log_error_errno(errno, "Failed to fstat(%s): %m", i->path);
1989
1990 if (stat(i->argument, &a) < 0)
1991 return log_error_errno(errno, "Failed to stat(%s): %m", i->argument);
1992
1993 if (((st.st_mode ^ a.st_mode) & S_IFMT) != 0) {
1994 log_debug("Can't copy to %s, file exists already and is of different type", i->path);
1995 return 0;
1996 }
1997
1998 return fd_set_perms(c, i, fd, i->path, &st, _CREATION_MODE_INVALID);
1999 }
2000
2001 static int create_directory_or_subvolume(
2002 const char *path,
2003 mode_t mode,
2004 bool subvol,
2005 bool allow_failure,
2006 struct stat *ret_st,
2007 CreationMode *ret_creation) {
2008
2009 _cleanup_free_ char *bn = NULL;
2010 _cleanup_close_ int pfd = -EBADF;
2011 CreationMode creation;
2012 struct stat st;
2013 int r, fd;
2014
2015 assert(path);
2016
2017 r = path_extract_filename(path, &bn);
2018 if (r < 0)
2019 return log_error_errno(r, "Failed to extract filename from path '%s': %m", path);
2020
2021 pfd = path_open_parent_safe(path, allow_failure);
2022 if (pfd < 0)
2023 return pfd;
2024
2025 if (subvol) {
2026 r = getenv_bool("SYSTEMD_TMPFILES_FORCE_SUBVOL");
2027 if (r < 0) {
2028 if (r != -ENXIO) /* env var is unset */
2029 log_warning_errno(r, "Cannot parse value of $SYSTEMD_TMPFILES_FORCE_SUBVOL, ignoring.");
2030 r = btrfs_is_subvol(empty_to_root(arg_root)) > 0;
2031 }
2032 if (r == 0)
2033 /* Don't create a subvolume unless the root directory is one, too. We do this under
2034 * the assumption that if the root directory is just a plain directory (i.e. very
2035 * light-weight), we shouldn't try to split it up into subvolumes (i.e. more
2036 * heavy-weight). Thus, chroot() environments and suchlike will get a full brtfs
2037 * subvolume set up below their tree only if they specifically set up a btrfs
2038 * subvolume for the root dir too. */
2039 subvol = false;
2040 else {
2041 log_action("Would create", "Creating", "%s btrfs subvolume %s", path);
2042 if (!arg_dry_run)
2043 WITH_UMASK((~mode) & 0777)
2044 r = btrfs_subvol_make(pfd, bn);
2045 else
2046 r = 0;
2047 }
2048 } else
2049 r = 0;
2050
2051 if (!subvol || ERRNO_IS_NEG_NOT_SUPPORTED(r)) {
2052 log_action("Would create", "Creating", "%s directory \"%s\"", path);
2053 if (!arg_dry_run)
2054 WITH_UMASK(0000)
2055 r = mkdirat_label(pfd, bn, mode);
2056 }
2057
2058 if (arg_dry_run)
2059 return 0;
2060
2061 creation = r >= 0 ? CREATION_NORMAL : CREATION_EXISTING;
2062
2063 fd = openat(pfd, bn, O_NOFOLLOW|O_CLOEXEC|O_DIRECTORY|O_PATH);
2064 if (fd < 0) {
2065 /* We couldn't open it because it is not actually a directory? */
2066 if (errno == ENOTDIR)
2067 return log_error_errno(SYNTHETIC_ERRNO(EEXIST), "\"%s\" already exists and is not a directory.", path);
2068
2069 /* Then look at the original error */
2070 if (r < 0)
2071 return log_full_errno(allow_failure ? LOG_INFO : LOG_ERR,
2072 r,
2073 "Failed to create directory or subvolume \"%s\"%s: %m",
2074 path,
2075 allow_failure ? ", ignoring" : "");
2076
2077 return log_error_errno(errno, "Failed to open directory/subvolume we just created '%s': %m", path);
2078 }
2079
2080 if (fstat(fd, &st) < 0)
2081 return log_error_errno(errno, "Failed to fstat(%s): %m", path);
2082
2083 assert(S_ISDIR(st.st_mode)); /* we used O_DIRECTORY above */
2084
2085 log_debug("%s directory \"%s\".", creation_mode_verb_to_string(creation), path);
2086
2087 if (ret_st)
2088 *ret_st = st;
2089 if (ret_creation)
2090 *ret_creation = creation;
2091
2092 return fd;
2093 }
2094
2095 static int create_directory(
2096 Context *c,
2097 Item *i,
2098 const char *path) {
2099
2100 _cleanup_close_ int fd = -EBADF;
2101 CreationMode creation;
2102 struct stat st;
2103
2104 assert(c);
2105 assert(i);
2106 assert(IN_SET(i->type, CREATE_DIRECTORY, TRUNCATE_DIRECTORY));
2107
2108 if (arg_dry_run) {
2109 log_info("Would create directory %s", path);
2110 return 0;
2111 }
2112
2113 fd = create_directory_or_subvolume(path, i->mode, /* subvol= */ false, i->allow_failure, &st, &creation);
2114 if (fd == -EEXIST)
2115 return 0;
2116 if (fd < 0)
2117 return fd;
2118
2119 return fd_set_perms(c, i, fd, path, &st, creation);
2120 }
2121
2122 static int create_subvolume(
2123 Context *c,
2124 Item *i,
2125 const char *path) {
2126
2127 _cleanup_close_ int fd = -EBADF;
2128 CreationMode creation;
2129 struct stat st;
2130 int r, q = 0;
2131
2132 assert(c);
2133 assert(i);
2134 assert(IN_SET(i->type, CREATE_SUBVOLUME, CREATE_SUBVOLUME_NEW_QUOTA, CREATE_SUBVOLUME_INHERIT_QUOTA));
2135
2136 if (arg_dry_run) {
2137 log_info("Would create subvolume %s", path);
2138 return 0;
2139 }
2140
2141 fd = create_directory_or_subvolume(path, i->mode, /* subvol = */ true, i->allow_failure, &st, &creation);
2142 if (fd == -EEXIST)
2143 return 0;
2144 if (fd < 0)
2145 return fd;
2146
2147 if (creation == CREATION_NORMAL &&
2148 IN_SET(i->type, CREATE_SUBVOLUME_NEW_QUOTA, CREATE_SUBVOLUME_INHERIT_QUOTA)) {
2149 r = btrfs_subvol_auto_qgroup_fd(fd, 0, i->type == CREATE_SUBVOLUME_NEW_QUOTA);
2150 if (r == -ENOTTY)
2151 log_debug_errno(r, "Couldn't adjust quota for subvolume \"%s\" (unsupported fs or dir not a subvolume): %m", i->path);
2152 else if (r == -EROFS)
2153 log_debug_errno(r, "Couldn't adjust quota for subvolume \"%s\" (fs is read-only).", i->path);
2154 else if (r == -ENOTCONN)
2155 log_debug_errno(r, "Couldn't adjust quota for subvolume \"%s\" (quota support is disabled).", i->path);
2156 else if (r < 0)
2157 q = log_error_errno(r, "Failed to adjust quota for subvolume \"%s\": %m", i->path);
2158 else if (r > 0)
2159 log_debug("Adjusted quota for subvolume \"%s\".", i->path);
2160 else if (r == 0)
2161 log_debug("Quota for subvolume \"%s\" already in place, no change made.", i->path);
2162 }
2163
2164 r = fd_set_perms(c, i, fd, path, &st, creation);
2165 if (q < 0) /* prefer the quota change error from above */
2166 return q;
2167
2168 return r;
2169 }
2170
2171 static int empty_directory(
2172 Context *c,
2173 Item *i,
2174 const char *path,
2175 CreationMode creation) {
2176
2177 _cleanup_close_ int fd = -EBADF;
2178 struct stat st;
2179 int r;
2180
2181 assert(c);
2182 assert(i);
2183 assert(i->type == EMPTY_DIRECTORY);
2184
2185 r = chase(path, arg_root, CHASE_SAFE|CHASE_WARN, NULL, &fd);
2186 if (r == -ENOLINK) /* Unsafe symlink: already covered by CHASE_WARN */
2187 return r;
2188 if (r == -ENOENT) {
2189 /* Option "e" operates only on existing objects. Do not print errors about non-existent files
2190 * or directories */
2191 log_debug_errno(r, "Skipping missing directory: %s", path);
2192 return 0;
2193 }
2194 if (r < 0)
2195 return log_error_errno(r, "Failed to open directory '%s': %m", path);
2196
2197 if (fstat(fd, &st) < 0)
2198 return log_error_errno(errno, "Failed to fstat(%s): %m", path);
2199 if (!S_ISDIR(st.st_mode)) {
2200 log_warning("'%s' already exists and is not a directory.", path);
2201 return 0;
2202 }
2203
2204 return fd_set_perms(c, i, fd, path, &st, creation);
2205 }
2206
2207 static int create_device(
2208 Context *c,
2209 Item *i,
2210 mode_t file_type) {
2211
2212 _cleanup_close_ int dfd = -EBADF, fd = -EBADF;
2213 _cleanup_free_ char *bn = NULL;
2214 CreationMode creation;
2215 struct stat st;
2216 int r;
2217
2218 assert(c);
2219 assert(i);
2220 assert(IN_SET(i->type, CREATE_BLOCK_DEVICE, CREATE_CHAR_DEVICE));
2221 assert(IN_SET(file_type, S_IFBLK, S_IFCHR));
2222
2223 r = path_extract_filename(i->path, &bn);
2224 if (r < 0)
2225 return log_error_errno(r, "Failed to extract filename from path '%s': %m", i->path);
2226 if (r == O_DIRECTORY)
2227 return log_error_errno(SYNTHETIC_ERRNO(EISDIR),
2228 "Cannot open path '%s' for creating device node, is a directory.", i->path);
2229
2230 if (arg_dry_run) {
2231 log_info("Would create device node %s", i->path);
2232 return 0;
2233 }
2234
2235 /* Validate the path and use the returned directory fd for copying the target so we're sure that the
2236 * path can't be changed behind our back. */
2237 dfd = path_open_parent_safe(i->path, i->allow_failure);
2238 if (dfd < 0)
2239 return dfd;
2240
2241 WITH_UMASK(0000) {
2242 mac_selinux_create_file_prepare(i->path, file_type);
2243 r = RET_NERRNO(mknodat(dfd, bn, i->mode | file_type, i->major_minor));
2244 mac_selinux_create_file_clear();
2245 }
2246 creation = r >= 0 ? CREATION_NORMAL : CREATION_EXISTING;
2247
2248 /* Try to open the inode via O_PATH, regardless if we could create it or not. Maybe everything is in
2249 * order anyway and we hence can ignore the error to create the device node */
2250 fd = openat(dfd, bn, O_NOFOLLOW|O_CLOEXEC|O_PATH);
2251 if (fd < 0) {
2252 /* OK, so opening the inode failed, let's look at the original error then. */
2253
2254 if (r < 0) {
2255 if (ERRNO_IS_PRIVILEGE(r))
2256 goto handle_privilege;
2257
2258 return log_error_errno(r, "Failed to create device node '%s': %m", i->path);
2259 }
2260
2261 return log_error_errno(errno, "Failed to open device node '%s' we just created: %m", i->path);
2262 }
2263
2264 if (fstat(fd, &st) < 0)
2265 return log_error_errno(errno, "Failed to fstat(%s): %m", i->path);
2266
2267 if (((st.st_mode ^ file_type) & S_IFMT) != 0) {
2268
2269 if (i->append_or_force) {
2270 fd = safe_close(fd);
2271
2272 WITH_UMASK(0000) {
2273 mac_selinux_create_file_prepare(i->path, file_type);
2274 r = mknodat_atomic(dfd, bn, i->mode | file_type, i->major_minor);
2275 mac_selinux_create_file_clear();
2276 }
2277 if (ERRNO_IS_PRIVILEGE(r))
2278 goto handle_privilege;
2279 if (IN_SET(r, -EISDIR, -EEXIST, -ENOTEMPTY)) {
2280 r = rm_rf_child(dfd, bn, REMOVE_PHYSICAL);
2281 if (r < 0)
2282 return log_error_errno(r, "rm -rf %s failed: %m", i->path);
2283
2284 mac_selinux_create_file_prepare(i->path, file_type);
2285 r = RET_NERRNO(mknodat(dfd, bn, i->mode | file_type, i->major_minor));
2286 mac_selinux_create_file_clear();
2287 }
2288 if (r < 0)
2289 return log_error_errno(r, "Failed to create device node '%s': %m", i->path);
2290
2291 fd = openat(dfd, bn, O_NOFOLLOW|O_CLOEXEC|O_PATH);
2292 if (fd < 0)
2293 return log_error_errno(errno, "Failed to open device node we just created '%s': %m", i->path);
2294
2295 /* Validate type before change ownership below */
2296 if (fstat(fd, &st) < 0)
2297 return log_error_errno(errno, "Failed to fstat(%s): %m", i->path);
2298
2299 if (((st.st_mode ^ file_type) & S_IFMT) != 0)
2300 return log_error_errno(SYNTHETIC_ERRNO(EBADF),
2301 "Device node we just created is not a device node, refusing.");
2302
2303 creation = CREATION_FORCE;
2304 } else {
2305 log_warning("\"%s\" already exists and is not a device node.", i->path);
2306 return 0;
2307 }
2308 }
2309
2310 log_debug("%s %s device node \"%s\" %u:%u.",
2311 creation_mode_verb_to_string(creation),
2312 i->type == CREATE_BLOCK_DEVICE ? "block" : "char",
2313 i->path, major(i->mode), minor(i->mode));
2314
2315 return fd_set_perms(c, i, fd, i->path, &st, creation);
2316
2317 handle_privilege:
2318 log_debug_errno(r,
2319 "We lack permissions, possibly because of cgroup configuration; "
2320 "skipping creation of device node '%s'.", i->path);
2321 return 0;
2322 }
2323
2324 static int create_fifo(Context *c, Item *i) {
2325 _cleanup_close_ int pfd = -EBADF, fd = -EBADF;
2326 _cleanup_free_ char *bn = NULL;
2327 CreationMode creation;
2328 struct stat st;
2329 int r;
2330
2331 assert(c);
2332 assert(i);
2333 assert(i->type == CREATE_FIFO);
2334
2335 r = path_extract_filename(i->path, &bn);
2336 if (r < 0)
2337 return log_error_errno(r, "Failed to extract filename from path '%s': %m", i->path);
2338 if (r == O_DIRECTORY)
2339 return log_error_errno(SYNTHETIC_ERRNO(EISDIR),
2340 "Cannot open path '%s' for creating FIFO, is a directory.", i->path);
2341
2342 if (arg_dry_run) {
2343 log_info("Would create fifo %s", i->path);
2344 return 0;
2345 }
2346
2347 pfd = path_open_parent_safe(i->path, i->allow_failure);
2348 if (pfd < 0)
2349 return pfd;
2350
2351 WITH_UMASK(0000) {
2352 mac_selinux_create_file_prepare(i->path, S_IFIFO);
2353 r = RET_NERRNO(mkfifoat(pfd, bn, i->mode));
2354 mac_selinux_create_file_clear();
2355 }
2356
2357 creation = r >= 0 ? CREATION_NORMAL : CREATION_EXISTING;
2358
2359 /* Open the inode via O_PATH, regardless if we managed to create it or not. Maybe it is already the FIFO we want */
2360 fd = openat(pfd, bn, O_NOFOLLOW|O_CLOEXEC|O_PATH);
2361 if (fd < 0) {
2362 if (r < 0)
2363 return log_error_errno(r, "Failed to create FIFO %s: %m", i->path); /* original error! */
2364
2365 return log_error_errno(errno, "Failed to open FIFO we just created %s: %m", i->path);
2366 }
2367
2368 if (fstat(fd, &st) < 0)
2369 return log_error_errno(errno, "Failed to fstat(%s): %m", i->path);
2370
2371 if (!S_ISFIFO(st.st_mode)) {
2372
2373 if (i->append_or_force) {
2374 fd = safe_close(fd);
2375
2376 WITH_UMASK(0000) {
2377 mac_selinux_create_file_prepare(i->path, S_IFIFO);
2378 r = mkfifoat_atomic(pfd, bn, i->mode);
2379 mac_selinux_create_file_clear();
2380 }
2381 if (IN_SET(r, -EISDIR, -EEXIST, -ENOTEMPTY)) {
2382 r = rm_rf_child(pfd, bn, REMOVE_PHYSICAL);
2383 if (r < 0)
2384 return log_error_errno(r, "rm -rf %s failed: %m", i->path);
2385
2386 mac_selinux_create_file_prepare(i->path, S_IFIFO);
2387 r = RET_NERRNO(mkfifoat(pfd, bn, i->mode));
2388 mac_selinux_create_file_clear();
2389 }
2390 if (r < 0)
2391 return log_error_errno(r, "Failed to create FIFO %s: %m", i->path);
2392
2393 fd = openat(pfd, bn, O_NOFOLLOW|O_CLOEXEC|O_PATH);
2394 if (fd < 0)
2395 return log_error_errno(errno, "Failed to open FIFO we just created '%s': %m", i->path);
2396
2397 /* Validate type before change ownership below */
2398 if (fstat(fd, &st) < 0)
2399 return log_error_errno(errno, "Failed to fstat(%s): %m", i->path);
2400
2401 if (!S_ISFIFO(st.st_mode))
2402 return log_error_errno(SYNTHETIC_ERRNO(EBADF),
2403 "FIFO inode we just created is not a FIFO, refusing.");
2404
2405 creation = CREATION_FORCE;
2406 } else {
2407 log_warning("\"%s\" already exists and is not a FIFO.", i->path);
2408 return 0;
2409 }
2410 }
2411
2412 log_debug("%s fifo \"%s\".", creation_mode_verb_to_string(creation), i->path);
2413
2414 return fd_set_perms(c, i, fd, i->path, &st, creation);
2415 }
2416
2417 static int create_symlink(Context *c, Item *i) {
2418 _cleanup_close_ int pfd = -EBADF, fd = -EBADF;
2419 _cleanup_free_ char *bn = NULL;
2420 CreationMode creation;
2421 struct stat st;
2422 bool good = false;
2423 int r;
2424
2425 assert(c);
2426 assert(i);
2427
2428 r = path_extract_filename(i->path, &bn);
2429 if (r < 0)
2430 return log_error_errno(r, "Failed to extract filename from path '%s': %m", i->path);
2431 if (r == O_DIRECTORY)
2432 return log_error_errno(SYNTHETIC_ERRNO(EISDIR),
2433 "Cannot open path '%s' for creating FIFO, is a directory.", i->path);
2434
2435 if (arg_dry_run) {
2436 log_info("Would create symlink %s -> %s", i->path, i->argument);
2437 return 0;
2438 }
2439
2440 pfd = path_open_parent_safe(i->path, i->allow_failure);
2441 if (pfd < 0)
2442 return pfd;
2443
2444 mac_selinux_create_file_prepare(i->path, S_IFLNK);
2445 r = RET_NERRNO(symlinkat(i->argument, pfd, bn));
2446 mac_selinux_create_file_clear();
2447
2448 creation = r >= 0 ? CREATION_NORMAL : CREATION_EXISTING;
2449
2450 fd = openat(pfd, bn, O_NOFOLLOW|O_CLOEXEC|O_PATH);
2451 if (fd < 0) {
2452 if (r < 0)
2453 return log_error_errno(r, "Failed to create symlink '%s': %m", i->path); /* original error! */
2454
2455 return log_error_errno(errno, "Failed to open symlink we just created '%s': %m", i->path);
2456 }
2457
2458 if (fstat(fd, &st) < 0)
2459 return log_error_errno(errno, "Failed to fstat(%s): %m", i->path);
2460
2461 if (S_ISLNK(st.st_mode)) {
2462 _cleanup_free_ char *x = NULL;
2463
2464 r = readlinkat_malloc(fd, "", &x);
2465 if (r < 0)
2466 return log_error_errno(r, "readlinkat(%s) failed: %m", i->path);
2467
2468 good = streq(x, i->argument);
2469 } else
2470 good = false;
2471
2472 if (!good) {
2473 if (!i->append_or_force) {
2474 log_debug("\"%s\" is not a symlink or does not point to the correct path.", i->path);
2475 return 0;
2476 }
2477
2478 fd = safe_close(fd);
2479
2480 mac_selinux_create_file_prepare(i->path, S_IFLNK);
2481 r = symlinkat_atomic_full(i->argument, pfd, bn, /* make_relative= */ false);
2482 mac_selinux_create_file_clear();
2483 if (IN_SET(r, -EISDIR, -EEXIST, -ENOTEMPTY)) {
2484 r = rm_rf_child(pfd, bn, REMOVE_PHYSICAL);
2485 if (r < 0)
2486 return log_error_errno(r, "rm -rf %s failed: %m", i->path);
2487
2488 mac_selinux_create_file_prepare(i->path, S_IFLNK);
2489 r = RET_NERRNO(symlinkat(i->argument, pfd, i->path));
2490 mac_selinux_create_file_clear();
2491 }
2492 if (r < 0)
2493 return log_error_errno(r, "symlink(%s, %s) failed: %m", i->argument, i->path);
2494
2495 fd = openat(pfd, bn, O_NOFOLLOW|O_CLOEXEC|O_PATH);
2496 if (fd < 0)
2497 return log_error_errno(errno, "Failed to open symlink we just created '%s': %m", i->path);
2498
2499 /* Validate type before change ownership below */
2500 if (fstat(fd, &st) < 0)
2501 return log_error_errno(errno, "Failed to fstat(%s): %m", i->path);
2502
2503 if (!S_ISLNK(st.st_mode))
2504 return log_error_errno(SYNTHETIC_ERRNO(EBADF), "Symlink we just created is not a symlink, refusing.");
2505
2506 creation = CREATION_FORCE;
2507 }
2508
2509 log_debug("%s symlink \"%s\".", creation_mode_verb_to_string(creation), i->path);
2510 return fd_set_perms(c, i, fd, i->path, &st, creation);
2511 }
2512
2513 typedef int (*action_t)(Context *c, Item *i, const char *path, CreationMode creation);
2514 typedef int (*fdaction_t)(Context *c, Item *i, int fd, const char *path, const struct stat *st, CreationMode creation);
2515
2516 static int item_do(
2517 Context *c,
2518 Item *i,
2519 int fd,
2520 const char *path,
2521 CreationMode creation,
2522 fdaction_t action) {
2523
2524 struct stat st;
2525 int r = 0, q;
2526
2527 assert(c);
2528 assert(i);
2529 assert(path);
2530 assert(fd >= 0);
2531
2532 if (fstat(fd, &st) < 0) {
2533 r = log_error_errno(errno, "fstat() on file failed: %m");
2534 goto finish;
2535 }
2536
2537 /* This returns the first error we run into, but nevertheless tries to go on */
2538 r = action(c, i, fd, path, &st, creation);
2539
2540 if (S_ISDIR(st.st_mode)) {
2541 _cleanup_closedir_ DIR *d = NULL;
2542
2543 /* The passed 'fd' was opened with O_PATH. We need to convert it into a 'regular' fd before
2544 * reading the directory content. */
2545 d = opendir(FORMAT_PROC_FD_PATH(fd));
2546 if (!d) {
2547 log_error_errno(errno, "Failed to opendir() '%s': %m", FORMAT_PROC_FD_PATH(fd));
2548 if (r == 0)
2549 r = -errno;
2550 goto finish;
2551 }
2552
2553 FOREACH_DIRENT_ALL(de, d, q = -errno; goto finish) {
2554 int de_fd;
2555
2556 if (dot_or_dot_dot(de->d_name))
2557 continue;
2558
2559 de_fd = openat(fd, de->d_name, O_NOFOLLOW|O_CLOEXEC|O_PATH);
2560 if (de_fd < 0)
2561 q = log_error_errno(errno, "Failed to open() file '%s': %m", de->d_name);
2562 else {
2563 _cleanup_free_ char *de_path = NULL;
2564
2565 de_path = path_join(path, de->d_name);
2566 if (!de_path)
2567 q = log_oom();
2568 else
2569 /* Pass ownership of dirent fd over */
2570 q = item_do(c, i, de_fd, de_path, CREATION_EXISTING, action);
2571 }
2572
2573 if (q < 0 && r == 0)
2574 r = q;
2575 }
2576 }
2577 finish:
2578 safe_close(fd);
2579 return r;
2580 }
2581
2582 static int glob_item(Context *c, Item *i, action_t action) {
2583 _cleanup_globfree_ glob_t g = {
2584 .gl_opendir = (void *(*)(const char *)) opendir_nomod,
2585 };
2586 int r = 0, k;
2587
2588 assert(c);
2589 assert(i);
2590
2591 k = safe_glob(i->path, GLOB_NOSORT|GLOB_BRACE, &g);
2592 if (k < 0 && k != -ENOENT)
2593 return log_error_errno(k, "glob(%s) failed: %m", i->path);
2594
2595 STRV_FOREACH(fn, g.gl_pathv) {
2596 /* We pass CREATION_EXISTING here, since if we are globbing for it, it always has to exist */
2597 k = action(c, i, *fn, CREATION_EXISTING);
2598 if (k < 0 && r == 0)
2599 r = k;
2600 }
2601
2602 return r;
2603 }
2604
2605 static int glob_item_recursively(
2606 Context *c,
2607 Item *i,
2608 fdaction_t action) {
2609
2610 _cleanup_globfree_ glob_t g = {
2611 .gl_opendir = (void *(*)(const char *)) opendir_nomod,
2612 };
2613 int r = 0, k;
2614
2615 k = safe_glob(i->path, GLOB_NOSORT|GLOB_BRACE, &g);
2616 if (k < 0 && k != -ENOENT)
2617 return log_error_errno(k, "glob(%s) failed: %m", i->path);
2618
2619 STRV_FOREACH(fn, g.gl_pathv) {
2620 _cleanup_close_ int fd = -EBADF;
2621
2622 /* Make sure we won't trigger/follow file object (such as
2623 * device nodes, automounts, ...) pointed out by 'fn' with
2624 * O_PATH. Note, when O_PATH is used, flags other than
2625 * O_CLOEXEC, O_DIRECTORY, and O_NOFOLLOW are ignored. */
2626
2627 fd = open(*fn, O_CLOEXEC|O_NOFOLLOW|O_PATH);
2628 if (fd < 0) {
2629 log_error_errno(errno, "Opening '%s' failed: %m", *fn);
2630 if (r == 0)
2631 r = -errno;
2632 continue;
2633 }
2634
2635 k = item_do(c, i, fd, *fn, CREATION_EXISTING, action);
2636 if (k < 0 && r == 0)
2637 r = k;
2638
2639 /* we passed fd ownership to the previous call */
2640 fd = -EBADF;
2641 }
2642
2643 return r;
2644 }
2645
2646 static int rm_if_wrong_type_safe(
2647 mode_t mode,
2648 int parent_fd,
2649 const struct stat *parent_st, /* Only used if follow_links below is true. */
2650 const char *name,
2651 int flags) {
2652 _cleanup_free_ char *parent_name = NULL;
2653 bool follow_links = !FLAGS_SET(flags, AT_SYMLINK_NOFOLLOW);
2654 struct stat st;
2655 int r;
2656
2657 assert(name);
2658 assert((mode & ~S_IFMT) == 0);
2659 assert(!follow_links || parent_st);
2660 assert((flags & ~AT_SYMLINK_NOFOLLOW) == 0);
2661
2662 if (mode == 0)
2663 return 0;
2664
2665 if (!filename_is_valid(name))
2666 return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "\"%s\" is not a valid filename.", name);
2667
2668 r = fstatat_harder(parent_fd, name, &st, flags, REMOVE_CHMOD | REMOVE_CHMOD_RESTORE);
2669 if (r < 0) {
2670 (void) fd_get_path(parent_fd, &parent_name);
2671 return log_full_errno(r == -ENOENT? LOG_DEBUG : LOG_ERR, r,
2672 "Failed to stat \"%s/%s\": %m", parent_name ?: "...", name);
2673 }
2674
2675 /* Fail before removing anything if this is an unsafe transition. */
2676 if (follow_links && unsafe_transition(parent_st, &st)) {
2677 (void) fd_get_path(parent_fd, &parent_name);
2678 return log_error_errno(SYNTHETIC_ERRNO(ENOLINK),
2679 "Unsafe transition from \"%s\" to \"%s\".", parent_name ?: "...", name);
2680 }
2681
2682 if ((st.st_mode & S_IFMT) == mode)
2683 return 0;
2684
2685 (void) fd_get_path(parent_fd, &parent_name);
2686 log_notice("Wrong file type 0o%o; rm -rf \"%s/%s\"", st.st_mode & S_IFMT, parent_name ?: "...", name);
2687
2688 /* If the target of the symlink was the wrong type, the link needs to be removed instead of the
2689 * target, so make sure it is identified as a link and not a directory. */
2690 if (follow_links) {
2691 r = fstatat_harder(parent_fd, name, &st, AT_SYMLINK_NOFOLLOW, REMOVE_CHMOD | REMOVE_CHMOD_RESTORE);
2692 if (r < 0)
2693 return log_error_errno(r, "Failed to stat \"%s/%s\": %m", parent_name ?: "...", name);
2694 }
2695
2696 /* Do not remove mount points. */
2697 r = fd_is_mount_point(parent_fd, name, follow_links ? AT_SYMLINK_FOLLOW : 0);
2698 if (r < 0)
2699 (void) log_warning_errno(r, "Failed to check if \"%s/%s\" is a mount point: %m; continuing.",
2700 parent_name ?: "...", name);
2701 else if (r > 0)
2702 return log_error_errno(SYNTHETIC_ERRNO(EBUSY),
2703 "Not removing \"%s/%s\" because it is a mount point.", parent_name ?: "...", name);
2704
2705 log_action("Would remove", "Removing", "%s %s/%s", parent_name ?: "...", name);
2706 if (!arg_dry_run) {
2707 if ((st.st_mode & S_IFMT) == S_IFDIR) {
2708 _cleanup_close_ int child_fd = -EBADF;
2709
2710 child_fd = openat(parent_fd, name, O_NOCTTY | O_CLOEXEC | O_DIRECTORY);
2711 if (child_fd < 0)
2712 return log_error_errno(errno, "Failed to open \"%s/%s\": %m", parent_name ?: "...", name);
2713
2714 r = rm_rf_children(TAKE_FD(child_fd), REMOVE_ROOT|REMOVE_SUBVOLUME|REMOVE_PHYSICAL, &st);
2715 if (r < 0)
2716 return log_error_errno(r, "Failed to remove contents of \"%s/%s\": %m", parent_name ?: "...", name);
2717
2718 r = unlinkat_harder(parent_fd, name, AT_REMOVEDIR, REMOVE_CHMOD | REMOVE_CHMOD_RESTORE);
2719 } else
2720 r = unlinkat_harder(parent_fd, name, 0, REMOVE_CHMOD | REMOVE_CHMOD_RESTORE);
2721 if (r < 0)
2722 return log_error_errno(r, "Failed to remove \"%s/%s\": %m", parent_name ?: "...", name);
2723 }
2724
2725 /* This is covered by the log_notice "Wrong file type...".
2726 * It is logged earlier because it gives context to other error messages that might follow. */
2727 return -ENOENT;
2728 }
2729
2730 /* If child_mode is non-zero, rm_if_wrong_type_safe will be executed for the last path component. */
2731 static int mkdir_parents_rm_if_wrong_type(mode_t child_mode, const char *path) {
2732 _cleanup_close_ int parent_fd = -EBADF;
2733 struct stat parent_st;
2734 size_t path_len;
2735 int r;
2736
2737 assert(path);
2738 assert((child_mode & ~S_IFMT) == 0);
2739
2740 path_len = strlen(path);
2741
2742 if (!is_path(path))
2743 /* rm_if_wrong_type_safe already logs errors. */
2744 return rm_if_wrong_type_safe(child_mode, AT_FDCWD, NULL, path, AT_SYMLINK_NOFOLLOW);
2745
2746 if (child_mode != 0 && endswith(path, "/"))
2747 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
2748 "Trailing path separators are only allowed if child_mode is not set; got \"%s\"", path);
2749
2750 /* Get the parent_fd and stat. */
2751 parent_fd = openat(AT_FDCWD, path_is_absolute(path) ? "/" : ".", O_NOCTTY | O_CLOEXEC | O_DIRECTORY);
2752 if (parent_fd < 0)
2753 return log_error_errno(errno, "Failed to open root: %m");
2754
2755 if (fstat(parent_fd, &parent_st) < 0)
2756 return log_error_errno(errno, "Failed to stat root: %m");
2757
2758 /* Check every parent directory in the path, except the last component */
2759 for (const char *e = path;;) {
2760 _cleanup_close_ int next_fd = -EBADF;
2761 char t[path_len + 1];
2762 const char *s;
2763
2764 /* Find the start of the next path component. */
2765 s = e + strspn(e, "/");
2766 /* Find the end of the next path component. */
2767 e = s + strcspn(s, "/");
2768
2769 /* Copy the path component to t so it can be a null terminated string. */
2770 *((char*) mempcpy(t, s, e - s)) = 0;
2771
2772 /* Is this the last component? If so, then check the type */
2773 if (*e == 0)
2774 return rm_if_wrong_type_safe(child_mode, parent_fd, &parent_st, t, AT_SYMLINK_NOFOLLOW);
2775
2776 r = rm_if_wrong_type_safe(S_IFDIR, parent_fd, &parent_st, t, 0);
2777 /* Remove dangling symlinks. */
2778 if (r == -ENOENT)
2779 r = rm_if_wrong_type_safe(S_IFDIR, parent_fd, &parent_st, t, AT_SYMLINK_NOFOLLOW);
2780 if (r == -ENOENT) {
2781 if (!arg_dry_run) {
2782 WITH_UMASK(0000)
2783 r = mkdirat_label(parent_fd, t, 0755);
2784 if (r < 0) {
2785 _cleanup_free_ char *parent_name = NULL;
2786
2787 (void) fd_get_path(parent_fd, &parent_name);
2788 return log_error_errno(r, "Failed to mkdir \"%s\" at \"%s\": %m", t, strnull(parent_name));
2789 }
2790 }
2791 } else if (r < 0)
2792 /* rm_if_wrong_type_safe already logs errors. */
2793 return r;
2794
2795 next_fd = RET_NERRNO(openat(parent_fd, t, O_NOCTTY | O_CLOEXEC | O_DIRECTORY));
2796 if (next_fd < 0) {
2797 _cleanup_free_ char *parent_name = NULL;
2798
2799 (void) fd_get_path(parent_fd, &parent_name);
2800 return log_error_errno(next_fd, "Failed to open \"%s\" at \"%s\": %m", t, strnull(parent_name));
2801 }
2802 r = RET_NERRNO(fstat(next_fd, &parent_st));
2803 if (r < 0) {
2804 _cleanup_free_ char *parent_name = NULL;
2805
2806 (void) fd_get_path(parent_fd, &parent_name);
2807 return log_error_errno(r, "Failed to stat \"%s\" at \"%s\": %m", t, strnull(parent_name));
2808 }
2809
2810 close_and_replace(parent_fd, next_fd);
2811 }
2812 }
2813
2814 static int mkdir_parents_item(Item *i, mode_t child_mode) {
2815 int r;
2816
2817 if (i->try_replace) {
2818 r = mkdir_parents_rm_if_wrong_type(child_mode, i->path);
2819 if (r < 0 && r != -ENOENT)
2820 return r;
2821 } else
2822 WITH_UMASK(0000)
2823 if (!arg_dry_run)
2824 (void) mkdir_parents_label(i->path, 0755);
2825
2826 return 0;
2827 }
2828
2829 static int create_item(Context *c, Item *i) {
2830 int r;
2831
2832 assert(c);
2833 assert(i);
2834
2835 log_debug("Running create action for entry %c %s", (char) i->type, i->path);
2836
2837 switch (i->type) {
2838
2839 case IGNORE_PATH:
2840 case IGNORE_DIRECTORY_PATH:
2841 case REMOVE_PATH:
2842 case RECURSIVE_REMOVE_PATH:
2843 return 0;
2844
2845 case TRUNCATE_FILE:
2846 case CREATE_FILE:
2847 r = mkdir_parents_item(i, S_IFREG);
2848 if (r < 0)
2849 return r;
2850
2851 if ((i->type == CREATE_FILE && i->append_or_force) || i->type == TRUNCATE_FILE)
2852 r = truncate_file(c, i, i->path);
2853 else
2854 r = create_file(c, i, i->path);
2855 if (r < 0)
2856 return r;
2857 break;
2858
2859 case COPY_FILES:
2860 r = mkdir_parents_item(i, 0);
2861 if (r < 0)
2862 return r;
2863
2864 r = copy_files(c, i);
2865 if (r < 0)
2866 return r;
2867 break;
2868
2869 case WRITE_FILE:
2870 r = glob_item(c, i, write_one_file);
2871 if (r < 0)
2872 return r;
2873
2874 break;
2875
2876 case CREATE_DIRECTORY:
2877 case TRUNCATE_DIRECTORY:
2878 r = mkdir_parents_item(i, S_IFDIR);
2879 if (r < 0)
2880 return r;
2881
2882 r = create_directory(c, i, i->path);
2883 if (r < 0)
2884 return r;
2885 break;
2886
2887 case CREATE_SUBVOLUME:
2888 case CREATE_SUBVOLUME_INHERIT_QUOTA:
2889 case CREATE_SUBVOLUME_NEW_QUOTA:
2890 r = mkdir_parents_item(i, S_IFDIR);
2891 if (r < 0)
2892 return r;
2893
2894 r = create_subvolume(c, i, i->path);
2895 if (r < 0)
2896 return r;
2897 break;
2898
2899 case EMPTY_DIRECTORY:
2900 r = glob_item(c, i, empty_directory);
2901 if (r < 0)
2902 return r;
2903 break;
2904
2905 case CREATE_FIFO:
2906 r = mkdir_parents_item(i, S_IFIFO);
2907 if (r < 0)
2908 return r;
2909
2910 r = create_fifo(c, i);
2911 if (r < 0)
2912 return r;
2913 break;
2914
2915 case CREATE_SYMLINK:
2916 r = mkdir_parents_item(i, S_IFLNK);
2917 if (r < 0)
2918 return r;
2919
2920 r = create_symlink(c, i);
2921 if (r < 0)
2922 return r;
2923
2924 break;
2925
2926 case CREATE_BLOCK_DEVICE:
2927 case CREATE_CHAR_DEVICE:
2928 if (have_effective_cap(CAP_MKNOD) <= 0) {
2929 /* In a container we lack CAP_MKNOD. We shouldn't attempt to create the device node in that
2930 * case to avoid noise, and we don't support virtualized devices in containers anyway. */
2931
2932 log_debug("We lack CAP_MKNOD, skipping creation of device node %s.", i->path);
2933 return 0;
2934 }
2935
2936 r = mkdir_parents_item(i, i->type == CREATE_BLOCK_DEVICE ? S_IFBLK : S_IFCHR);
2937 if (r < 0)
2938 return r;
2939
2940 r = create_device(c, i, i->type == CREATE_BLOCK_DEVICE ? S_IFBLK : S_IFCHR);
2941 if (r < 0)
2942 return r;
2943
2944 break;
2945
2946 case ADJUST_MODE:
2947 case RELABEL_PATH:
2948 r = glob_item(c, i, path_set_perms);
2949 if (r < 0)
2950 return r;
2951 break;
2952
2953 case RECURSIVE_RELABEL_PATH:
2954 r = glob_item_recursively(c, i, fd_set_perms);
2955 if (r < 0)
2956 return r;
2957 break;
2958
2959 case SET_XATTR:
2960 r = glob_item(c, i, path_set_xattrs);
2961 if (r < 0)
2962 return r;
2963 break;
2964
2965 case RECURSIVE_SET_XATTR:
2966 r = glob_item_recursively(c, i, fd_set_xattrs);
2967 if (r < 0)
2968 return r;
2969 break;
2970
2971 case SET_ACL:
2972 r = glob_item(c, i, path_set_acls);
2973 if (r < 0)
2974 return r;
2975 break;
2976
2977 case RECURSIVE_SET_ACL:
2978 r = glob_item_recursively(c, i, fd_set_acls);
2979 if (r < 0)
2980 return r;
2981 break;
2982
2983 case SET_ATTRIBUTE:
2984 r = glob_item(c, i, path_set_attribute);
2985 if (r < 0)
2986 return r;
2987 break;
2988
2989 case RECURSIVE_SET_ATTRIBUTE:
2990 r = glob_item_recursively(c, i, fd_set_attribute);
2991 if (r < 0)
2992 return r;
2993 break;
2994 }
2995
2996 return 0;
2997 }
2998
2999 static int remove_recursive(
3000 Context *c,
3001 Item *i,
3002 const char *instance,
3003 bool remove_instance) {
3004
3005 _cleanup_closedir_ DIR *d = NULL;
3006 STRUCT_STATX_DEFINE(sx);
3007 bool mountpoint;
3008 int r;
3009
3010 r = opendir_and_stat(instance, &d, &sx, &mountpoint);
3011 if (r < 0)
3012 return r;
3013 if (r == 0) {
3014 if (remove_instance) {
3015 log_action("Would remove", "Removing", "%s file \"%s\".", instance);
3016 if (!arg_dry_run &&
3017 remove(instance) < 0 &&
3018 errno != ENOENT)
3019 return log_error_errno(errno, "rm %s: %m", instance);
3020 }
3021 return 0;
3022 }
3023
3024 r = dir_cleanup(c, i, instance, d,
3025 /* self_atime_nsec= */ NSEC_INFINITY,
3026 /* self_mtime_nsec= */ NSEC_INFINITY,
3027 /* cutoff_nsec= */ NSEC_INFINITY,
3028 sx.stx_dev_major, sx.stx_dev_minor,
3029 mountpoint,
3030 MAX_DEPTH,
3031 /* keep_this_level= */ false,
3032 /* age_by_file= */ 0,
3033 /* age_by_dir= */ 0);
3034 if (r < 0)
3035 return r;
3036
3037 if (remove_instance) {
3038 log_debug("Removing directory \"%s\".", instance);
3039 r = RET_NERRNO(rmdir(instance));
3040 if (r < 0 && !IN_SET(r, -ENOENT, -ENOTEMPTY))
3041 return log_error_errno(r, "Failed to remove %s: %m", instance);
3042 }
3043 return 0;
3044 }
3045
3046 static int purge_item_instance(Context *c, Item *i, const char *instance, CreationMode creation) {
3047 return remove_recursive(c, i, instance, /* remove_instance= */ true);
3048 }
3049
3050 static int purge_item(Context *c, Item *i) {
3051 assert(i);
3052
3053 if (!needs_purge(i->type))
3054 return 0;
3055
3056 log_debug("Running purge action for entry %c %s", (char) i->type, i->path);
3057
3058 if (needs_glob(i->type))
3059 return glob_item(c, i, purge_item_instance);
3060
3061 return purge_item_instance(c, i, i->path, CREATION_EXISTING);
3062 }
3063
3064 static int remove_item_instance(
3065 Context *c,
3066 Item *i,
3067 const char *instance,
3068 CreationMode creation) {
3069
3070 assert(c);
3071 assert(i);
3072
3073 switch (i->type) {
3074
3075 case REMOVE_PATH:
3076 log_action("Would remove", "Removing", "%s \"%s\".", instance);
3077 if (!arg_dry_run &&
3078 remove(instance) < 0 &&
3079 errno != ENOENT)
3080 return log_error_errno(errno, "rm %s: %m", instance);
3081
3082 return 0;
3083
3084 case RECURSIVE_REMOVE_PATH:
3085 return remove_recursive(c, i, instance, /* remove_instance= */ true);
3086
3087 default:
3088 assert_not_reached();
3089 }
3090 }
3091
3092 static int remove_item(Context *c, Item *i) {
3093 assert(c);
3094 assert(i);
3095
3096 log_debug("Running remove action for entry %c %s", (char) i->type, i->path);
3097
3098 switch (i->type) {
3099
3100 case TRUNCATE_DIRECTORY:
3101 return remove_recursive(c, i, i->path, /* remove_instance= */ false);
3102
3103 case REMOVE_PATH:
3104 case RECURSIVE_REMOVE_PATH:
3105 return glob_item(c, i, remove_item_instance);
3106
3107 default:
3108 return 0;
3109 }
3110 }
3111
3112 static char *age_by_to_string(AgeBy ab, bool is_dir) {
3113 static const char ab_map[] = { 'a', 'b', 'c', 'm' };
3114 size_t j = 0;
3115 char *ret;
3116
3117 ret = new(char, ELEMENTSOF(ab_map) + 1);
3118 if (!ret)
3119 return NULL;
3120
3121 for (size_t i = 0; i < ELEMENTSOF(ab_map); i++)
3122 if (FLAGS_SET(ab, 1U << i))
3123 ret[j++] = is_dir ? ascii_toupper(ab_map[i]) : ab_map[i];
3124
3125 ret[j] = 0;
3126 return ret;
3127 }
3128
3129 static int clean_item_instance(
3130 Context *c,
3131 Item *i,
3132 const char* instance,
3133 CreationMode creation) {
3134
3135 assert(i);
3136
3137 if (!i->age_set)
3138 return 0;
3139
3140 usec_t n = now(CLOCK_REALTIME);
3141 if (n < i->age)
3142 return 0;
3143
3144 usec_t cutoff = n - i->age;
3145
3146 _cleanup_closedir_ DIR *d = NULL;
3147 STRUCT_STATX_DEFINE(sx);
3148 bool mountpoint;
3149 int r;
3150
3151 r = opendir_and_stat(instance, &d, &sx, &mountpoint);
3152 if (r <= 0)
3153 return r;
3154
3155 if (DEBUG_LOGGING) {
3156 _cleanup_free_ char *ab_f = NULL, *ab_d = NULL;
3157
3158 ab_f = age_by_to_string(i->age_by_file, false);
3159 if (!ab_f)
3160 return log_oom();
3161
3162 ab_d = age_by_to_string(i->age_by_dir, true);
3163 if (!ab_d)
3164 return log_oom();
3165
3166 log_debug("Cleanup threshold for %s \"%s\" is %s; age-by: %s%s",
3167 mountpoint ? "mount point" : "directory",
3168 instance,
3169 FORMAT_TIMESTAMP_STYLE(cutoff, TIMESTAMP_US),
3170 ab_f, ab_d);
3171 }
3172
3173 return dir_cleanup(c, i, instance, d,
3174 statx_timestamp_load_nsec(&sx.stx_atime),
3175 statx_timestamp_load_nsec(&sx.stx_mtime),
3176 cutoff * NSEC_PER_USEC,
3177 sx.stx_dev_major, sx.stx_dev_minor,
3178 mountpoint,
3179 MAX_DEPTH, i->keep_first_level,
3180 i->age_by_file, i->age_by_dir);
3181 }
3182
3183 static int clean_item(Context *c, Item *i) {
3184 assert(c);
3185 assert(i);
3186
3187 log_debug("Running clean action for entry %c %s", (char) i->type, i->path);
3188
3189 switch (i->type) {
3190
3191 case CREATE_DIRECTORY:
3192 case TRUNCATE_DIRECTORY:
3193 case CREATE_SUBVOLUME:
3194 case CREATE_SUBVOLUME_INHERIT_QUOTA:
3195 case CREATE_SUBVOLUME_NEW_QUOTA:
3196 case COPY_FILES:
3197 clean_item_instance(c, i, i->path, CREATION_EXISTING);
3198 return 0;
3199
3200 case EMPTY_DIRECTORY:
3201 case IGNORE_PATH:
3202 case IGNORE_DIRECTORY_PATH:
3203 return glob_item(c, i, clean_item_instance);
3204
3205 default:
3206 return 0;
3207 }
3208 }
3209
3210 static int process_item(
3211 Context *c,
3212 Item *i,
3213 OperationMask operation) {
3214
3215 OperationMask todo;
3216 _cleanup_free_ char *_path = NULL;
3217 const char *path;
3218 int r;
3219
3220 assert(c);
3221 assert(i);
3222
3223 todo = operation & ~i->done;
3224 if (todo == 0) /* Everything already done? */
3225 return 0;
3226
3227 i->done |= operation;
3228
3229 path = i->path;
3230 if (string_is_glob(path)) {
3231 /* We can't easily check whether a glob matches any autofs path, so let's do the check only
3232 * for the non-glob part. */
3233
3234 r = glob_non_glob_prefix(path, &_path);
3235 if (r < 0 && r != -ENOENT)
3236 return log_debug_errno(r, "Failed to deglob path: %m");
3237 if (r >= 0)
3238 path = _path;
3239 }
3240
3241 r = chase(path, arg_root, CHASE_NO_AUTOFS|CHASE_NONEXISTENT|CHASE_WARN, NULL, NULL);
3242 if (r == -EREMOTE) {
3243 log_notice_errno(r, "Skipping %s", i->path); /* We log the configured path, to not confuse the user. */
3244 return 0;
3245 }
3246 if (r < 0)
3247 log_debug_errno(r, "Failed to determine whether '%s' is below autofs, ignoring: %m", i->path);
3248
3249 r = FLAGS_SET(operation, OPERATION_CREATE) ? create_item(c, i) : 0;
3250 /* Failure can only be tolerated for create */
3251 if (i->allow_failure)
3252 r = 0;
3253
3254 RET_GATHER(r, FLAGS_SET(operation, OPERATION_REMOVE) ? remove_item(c, i) : 0);
3255 RET_GATHER(r, FLAGS_SET(operation, OPERATION_CLEAN) ? clean_item(c, i) : 0);
3256 RET_GATHER(r, FLAGS_SET(operation, OPERATION_PURGE) ? purge_item(c, i) : 0);
3257
3258 return r;
3259 }
3260
3261 static int process_item_array(
3262 Context *c,
3263 ItemArray *array,
3264 OperationMask operation) {
3265
3266 int r = 0;
3267
3268 assert(c);
3269 assert(array);
3270
3271 /* Create any parent first. */
3272 if (FLAGS_SET(operation, OPERATION_CREATE) && array->parent)
3273 r = process_item_array(c, array->parent, operation & OPERATION_CREATE);
3274
3275 /* Clean up all children first */
3276 if ((operation & (OPERATION_REMOVE|OPERATION_CLEAN|OPERATION_PURGE)) && !set_isempty(array->children)) {
3277 ItemArray *cc;
3278
3279 SET_FOREACH(cc, array->children)
3280 RET_GATHER(r, process_item_array(c, cc, operation & (OPERATION_REMOVE|OPERATION_CLEAN|OPERATION_PURGE)));
3281 }
3282
3283 FOREACH_ARRAY(item, array->items, array->n_items)
3284 RET_GATHER(r, process_item(c, item, operation));
3285
3286 return r;
3287 }
3288
3289 static void item_free_contents(Item *i) {
3290 assert(i);
3291 free(i->path);
3292 free(i->argument);
3293 free(i->binary_argument);
3294 strv_free(i->xattrs);
3295
3296 #if HAVE_ACL
3297 if (i->acl_access)
3298 acl_free(i->acl_access);
3299
3300 if (i->acl_access_exec)
3301 acl_free(i->acl_access_exec);
3302
3303 if (i->acl_default)
3304 acl_free(i->acl_default);
3305 #endif
3306 }
3307
3308 static ItemArray* item_array_free(ItemArray *a) {
3309 if (!a)
3310 return NULL;
3311
3312 FOREACH_ARRAY(item, a->items, a->n_items)
3313 item_free_contents(item);
3314
3315 set_free(a->children);
3316 free(a->items);
3317 return mfree(a);
3318 }
3319
3320 static int item_compare(const Item *a, const Item *b) {
3321 /* Make sure that the ownership taking item is put first, so
3322 * that we first create the node, and then can adjust it */
3323
3324 if (takes_ownership(a->type) && !takes_ownership(b->type))
3325 return -1;
3326 if (!takes_ownership(a->type) && takes_ownership(b->type))
3327 return 1;
3328
3329 return CMP(a->type, b->type);
3330 }
3331
3332 static bool item_compatible(const Item *a, const Item *b) {
3333 assert(a);
3334 assert(b);
3335 assert(streq(a->path, b->path));
3336
3337 if (takes_ownership(a->type) && takes_ownership(b->type))
3338 /* check if the items are the same */
3339 return memcmp_nn(item_binary_argument(a), item_binary_argument_size(a),
3340 item_binary_argument(b), item_binary_argument_size(b)) == 0 &&
3341
3342 a->uid_set == b->uid_set &&
3343 a->uid == b->uid &&
3344 a->uid_only_create == b->uid_only_create &&
3345
3346 a->gid_set == b->gid_set &&
3347 a->gid == b->gid &&
3348 a->gid_only_create == b->gid_only_create &&
3349
3350 a->mode_set == b->mode_set &&
3351 a->mode == b->mode &&
3352 a->mode_only_create == b->mode_only_create &&
3353
3354 a->age_set == b->age_set &&
3355 a->age == b->age &&
3356
3357 a->age_by_file == b->age_by_file &&
3358 a->age_by_dir == b->age_by_dir &&
3359
3360 a->mask_perms == b->mask_perms &&
3361
3362 a->keep_first_level == b->keep_first_level &&
3363
3364 a->major_minor == b->major_minor;
3365
3366 return true;
3367 }
3368
3369 static bool should_include_path(const char *path) {
3370 STRV_FOREACH(prefix, arg_exclude_prefixes)
3371 if (path_startswith(path, *prefix)) {
3372 log_debug("Entry \"%s\" matches exclude prefix \"%s\", skipping.",
3373 path, *prefix);
3374 return false;
3375 }
3376
3377 STRV_FOREACH(prefix, arg_include_prefixes)
3378 if (path_startswith(path, *prefix)) {
3379 log_debug("Entry \"%s\" matches include prefix \"%s\".", path, *prefix);
3380 return true;
3381 }
3382
3383 /* no matches, so we should include this path only if we have no allow list at all */
3384 if (strv_isempty(arg_include_prefixes))
3385 return true;
3386
3387 log_debug("Entry \"%s\" does not match any include prefix, skipping.", path);
3388 return false;
3389 }
3390
3391 static int specifier_expansion_from_arg(const Specifier *specifier_table, Item *i) {
3392 int r;
3393
3394 assert(i);
3395
3396 if (!i->argument)
3397 return 0;
3398
3399 switch (i->type) {
3400 case COPY_FILES:
3401 case CREATE_SYMLINK:
3402 case CREATE_FILE:
3403 case TRUNCATE_FILE:
3404 case WRITE_FILE: {
3405 _cleanup_free_ char *unescaped = NULL, *resolved = NULL;
3406 ssize_t l;
3407
3408 l = cunescape(i->argument, 0, &unescaped);
3409 if (l < 0)
3410 return log_error_errno(l, "Failed to unescape parameter to write: %s", i->argument);
3411
3412 r = specifier_printf(unescaped, PATH_MAX-1, specifier_table, arg_root, NULL, &resolved);
3413 if (r < 0)
3414 return r;
3415
3416 return free_and_replace(i->argument, resolved);
3417 }
3418 case SET_XATTR:
3419 case RECURSIVE_SET_XATTR:
3420 STRV_FOREACH(xattr, i->xattrs) {
3421 _cleanup_free_ char *resolved = NULL;
3422
3423 r = specifier_printf(*xattr, SIZE_MAX, specifier_table, arg_root, NULL, &resolved);
3424 if (r < 0)
3425 return r;
3426
3427 free_and_replace(*xattr, resolved);
3428 }
3429 return 0;
3430
3431 default:
3432 return 0;
3433 }
3434 }
3435
3436 static int patch_var_run(const char *fname, unsigned line, char **path) {
3437 const char *k;
3438 char *n;
3439
3440 assert(path);
3441 assert(*path);
3442
3443 /* Optionally rewrites lines referencing /var/run/, to use /run/ instead. Why bother? tmpfiles merges
3444 * lines in some cases and detects conflicts in others. If files/directories are specified through
3445 * two equivalent lines this is problematic as neither case will be detected. Ideally we'd detect
3446 * these cases by resolving symlinks early, but that's precisely not what we can do here as this code
3447 * very likely is running very early on, at a time where the paths in question are not available yet,
3448 * or even more importantly, our own tmpfiles rules might create the paths that are intermediary to
3449 * the listed paths. We can't really cover the generic case, but the least we can do is cover the
3450 * specific case of /var/run vs. /run, as /var/run is a legacy name for /run only, and we explicitly
3451 * document that and require that on systemd systems the former is a symlink to the latter. Moreover
3452 * files below this path are by far the primary use case for tmpfiles.d/. */
3453
3454 k = path_startswith(*path, "/var/run/");
3455 if (isempty(k)) /* Don't complain about paths other than under /var/run,
3456 * and not about /var/run itself either. */
3457 return 0;
3458
3459 n = path_join("/run", k);
3460 if (!n)
3461 return log_oom();
3462
3463 /* Also log about this briefly. We do so at LOG_NOTICE level, as we fixed up the situation
3464 * automatically, hence there's no immediate need for action by the user. However, in the interest of
3465 * making things less confusing to the user, let's still inform the user that these snippets should
3466 * really be updated. */
3467 log_syntax(NULL, LOG_NOTICE, fname, line, 0,
3468 "Line references path below legacy directory /var/run/, updating %s → %s; please update the tmpfiles.d/ drop-in file accordingly.",
3469 *path, n);
3470
3471 free_and_replace(*path, n);
3472
3473 return 0;
3474 }
3475
3476 static int find_uid(const char *user, uid_t *ret_uid, Hashmap **cache) {
3477 int r;
3478
3479 assert(user);
3480 assert(ret_uid);
3481
3482 /* First: parse as numeric UID string */
3483 r = parse_uid(user, ret_uid);
3484 if (r >= 0)
3485 return r;
3486
3487 /* Second: pass to NSS if we are running "online" */
3488 if (!arg_root)
3489 return get_user_creds(&user, ret_uid, NULL, NULL, NULL, 0);
3490
3491 /* Third, synthesize "root" unconditionally */
3492 if (streq(user, "root")) {
3493 *ret_uid = 0;
3494 return 0;
3495 }
3496
3497 /* Fourth: use fgetpwent() to read /etc/passwd directly, if we are "offline" */
3498 return name_to_uid_offline(arg_root, user, ret_uid, cache);
3499 }
3500
3501 static int find_gid(const char *group, gid_t *ret_gid, Hashmap **cache) {
3502 int r;
3503
3504 assert(group);
3505 assert(ret_gid);
3506
3507 /* First: parse as numeric GID string */
3508 r = parse_gid(group, ret_gid);
3509 if (r >= 0)
3510 return r;
3511
3512 /* Second: pass to NSS if we are running "online" */
3513 if (!arg_root)
3514 return get_group_creds(&group, ret_gid, 0);
3515
3516 /* Third, synthesize "root" unconditionally */
3517 if (streq(group, "root")) {
3518 *ret_gid = 0;
3519 return 0;
3520 }
3521
3522 /* Fourth: use fgetgrent() to read /etc/group directly, if we are "offline" */
3523 return name_to_gid_offline(arg_root, group, ret_gid, cache);
3524 }
3525
3526 static int parse_age_by_from_arg(const char *age_by_str, Item *item) {
3527 AgeBy ab_f = 0, ab_d = 0;
3528
3529 static const struct {
3530 char age_by_chr;
3531 AgeBy age_by_flag;
3532 } age_by_types[] = {
3533 { 'a', AGE_BY_ATIME },
3534 { 'b', AGE_BY_BTIME },
3535 { 'c', AGE_BY_CTIME },
3536 { 'm', AGE_BY_MTIME },
3537 };
3538
3539 assert(age_by_str);
3540 assert(item);
3541
3542 if (isempty(age_by_str))
3543 return -EINVAL;
3544
3545 for (const char *s = age_by_str; *s != 0; s++) {
3546 size_t i;
3547
3548 /* Ignore whitespace. */
3549 if (strchr(WHITESPACE, *s))
3550 continue;
3551
3552 for (i = 0; i < ELEMENTSOF(age_by_types); i++) {
3553 /* Check lower-case for files, upper-case for directories. */
3554 if (*s == age_by_types[i].age_by_chr) {
3555 ab_f |= age_by_types[i].age_by_flag;
3556 break;
3557 } else if (*s == ascii_toupper(age_by_types[i].age_by_chr)) {
3558 ab_d |= age_by_types[i].age_by_flag;
3559 break;
3560 }
3561 }
3562
3563 /* Invalid character. */
3564 if (i >= ELEMENTSOF(age_by_types))
3565 return -EINVAL;
3566 }
3567
3568 /* No match. */
3569 if (ab_f == 0 && ab_d == 0)
3570 return -EINVAL;
3571
3572 item->age_by_file = ab_f > 0 ? ab_f : AGE_BY_DEFAULT_FILE;
3573 item->age_by_dir = ab_d > 0 ? ab_d : AGE_BY_DEFAULT_DIR;
3574
3575 return 0;
3576 }
3577
3578 static bool is_duplicated_item(ItemArray *existing, const Item *i) {
3579 assert(existing);
3580 assert(i);
3581
3582 FOREACH_ARRAY(e, existing->items, existing->n_items) {
3583 if (item_compatible(e, i))
3584 continue;
3585
3586 /* Only multiple 'w+' lines for the same path are allowed. */
3587 if (e->type != WRITE_FILE || !e->append_or_force ||
3588 i->type != WRITE_FILE || !i->append_or_force)
3589 return true;
3590 }
3591
3592 return false;
3593 }
3594
3595 static int parse_line(
3596 const char *fname,
3597 unsigned line,
3598 const char *buffer,
3599 bool *invalid_config,
3600 void *context) {
3601
3602 Context *c = ASSERT_PTR(context);
3603 _cleanup_free_ char *action = NULL, *mode = NULL, *user = NULL, *group = NULL, *age = NULL, *path = NULL;
3604 _cleanup_(item_free_contents) Item i = {
3605 /* The "age-by" argument considers all file timestamp types by default. */
3606 .age_by_file = AGE_BY_DEFAULT_FILE,
3607 .age_by_dir = AGE_BY_DEFAULT_DIR,
3608 };
3609 ItemArray *existing;
3610 OrderedHashmap *h;
3611 bool append_or_force = false, boot = false, allow_failure = false, try_replace = false,
3612 unbase64 = false, from_cred = false, missing_user_or_group = false;
3613 int r;
3614
3615 assert(fname);
3616 assert(line >= 1);
3617 assert(buffer);
3618
3619 const Specifier specifier_table[] = {
3620 { 'a', specifier_architecture, NULL },
3621 { 'b', specifier_boot_id, NULL },
3622 { 'B', specifier_os_build_id, NULL },
3623 { 'H', specifier_hostname, NULL },
3624 { 'l', specifier_short_hostname, NULL },
3625 { 'm', specifier_machine_id, NULL },
3626 { 'o', specifier_os_id, NULL },
3627 { 'v', specifier_kernel_release, NULL },
3628 { 'w', specifier_os_version_id, NULL },
3629 { 'W', specifier_os_variant_id, NULL },
3630
3631 { 'h', specifier_user_home, NULL },
3632
3633 { 'C', specifier_directory, UINT_TO_PTR(DIRECTORY_CACHE) },
3634 { 'L', specifier_directory, UINT_TO_PTR(DIRECTORY_LOGS) },
3635 { 'S', specifier_directory, UINT_TO_PTR(DIRECTORY_STATE) },
3636 { 't', specifier_directory, UINT_TO_PTR(DIRECTORY_RUNTIME) },
3637
3638 COMMON_CREDS_SPECIFIERS(arg_runtime_scope),
3639 COMMON_TMP_SPECIFIERS,
3640 {}
3641 };
3642
3643 r = extract_many_words(
3644 &buffer,
3645 NULL,
3646 EXTRACT_UNQUOTE | EXTRACT_CUNESCAPE,
3647 &action,
3648 &path,
3649 &mode,
3650 &user,
3651 &group,
3652 &age,
3653 NULL);
3654 if (r < 0) {
3655 if (IN_SET(r, -EINVAL, -EBADSLT))
3656 /* invalid quoting and such or an unknown specifier */
3657 *invalid_config = true;
3658 return log_syntax(NULL, LOG_ERR, fname, line, r, "Failed to parse line: %m");
3659 } else if (r < 2) {
3660 *invalid_config = true;
3661 return log_syntax(NULL, LOG_ERR, fname, line, SYNTHETIC_ERRNO(EBADMSG), "Syntax error.");
3662 }
3663
3664 if (!empty_or_dash(buffer)) {
3665 i.argument = strdup(buffer);
3666 if (!i.argument)
3667 return log_oom();
3668 }
3669
3670 if (isempty(action)) {
3671 *invalid_config = true;
3672 return log_syntax(NULL, LOG_ERR, fname, line, SYNTHETIC_ERRNO(EBADMSG),
3673 "Command too short '%s'.", action);
3674 }
3675
3676 for (int pos = 1; action[pos]; pos++)
3677 if (action[pos] == '!' && !boot)
3678 boot = true;
3679 else if (action[pos] == '+' && !append_or_force)
3680 append_or_force = true;
3681 else if (action[pos] == '-' && !allow_failure)
3682 allow_failure = true;
3683 else if (action[pos] == '=' && !try_replace)
3684 try_replace = true;
3685 else if (action[pos] == '~' && !unbase64)
3686 unbase64 = true;
3687 else if (action[pos] == '^' && !from_cred)
3688 from_cred = true;
3689 else {
3690 *invalid_config = true;
3691 return log_syntax(NULL, LOG_ERR, fname, line, SYNTHETIC_ERRNO(EBADMSG),
3692 "Unknown modifiers in command '%s'.", action);
3693 }
3694
3695 if (boot && !arg_boot) {
3696 log_syntax(NULL, LOG_DEBUG, fname, line, 0,
3697 "Ignoring entry %s \"%s\" because --boot is not specified.", action, path);
3698 return 0;
3699 }
3700
3701 i.type = action[0];
3702 i.append_or_force = append_or_force;
3703 i.allow_failure = allow_failure;
3704 i.try_replace = try_replace;
3705
3706 r = specifier_printf(path, PATH_MAX-1, specifier_table, arg_root, NULL, &i.path);
3707 if (ERRNO_IS_NOINFO(r))
3708 return log_unresolvable_specifier(fname, line);
3709 if (r < 0) {
3710 if (IN_SET(r, -EINVAL, -EBADSLT))
3711 *invalid_config = true;
3712 return log_syntax(NULL, LOG_ERR, fname, line, r,
3713 "Failed to replace specifiers in '%s': %m", path);
3714 }
3715
3716 r = patch_var_run(fname, line, &i.path);
3717 if (r < 0)
3718 return r;
3719
3720 if (!path_is_absolute(i.path)) {
3721 *invalid_config = true;
3722 return log_syntax(NULL, LOG_ERR, fname, line, SYNTHETIC_ERRNO(EBADMSG),
3723 "Path '%s' not absolute.", i.path);
3724 }
3725
3726 path_simplify(i.path);
3727
3728 switch (i.type) {
3729
3730 case CREATE_DIRECTORY:
3731 case CREATE_SUBVOLUME:
3732 case CREATE_SUBVOLUME_INHERIT_QUOTA:
3733 case CREATE_SUBVOLUME_NEW_QUOTA:
3734 case EMPTY_DIRECTORY:
3735 case TRUNCATE_DIRECTORY:
3736 case CREATE_FIFO:
3737 case IGNORE_PATH:
3738 case IGNORE_DIRECTORY_PATH:
3739 case REMOVE_PATH:
3740 case RECURSIVE_REMOVE_PATH:
3741 case ADJUST_MODE:
3742 case RELABEL_PATH:
3743 case RECURSIVE_RELABEL_PATH:
3744 if (i.argument)
3745 log_syntax(NULL, LOG_WARNING, fname, line, 0,
3746 "%c lines don't take argument fields, ignoring.", (char) i.type);
3747 break;
3748
3749 case CREATE_FILE:
3750 case TRUNCATE_FILE:
3751 break;
3752
3753 case CREATE_SYMLINK:
3754 if (unbase64) {
3755 *invalid_config = true;
3756 return log_syntax(NULL, LOG_ERR, fname, line, SYNTHETIC_ERRNO(EBADMSG),
3757 "base64 decoding not supported for symlink targets.");
3758 }
3759 break;
3760
3761 case WRITE_FILE:
3762 if (!i.argument) {
3763 *invalid_config = true;
3764 return log_syntax(NULL, LOG_ERR, fname, line, SYNTHETIC_ERRNO(EBADMSG),
3765 "Write file requires argument.");
3766 }
3767 break;
3768
3769 case COPY_FILES:
3770 if (unbase64) {
3771 *invalid_config = true;
3772 return log_syntax(NULL, LOG_ERR, fname, line, SYNTHETIC_ERRNO(EBADMSG),
3773 "base64 decoding not supported for copy sources.");
3774 }
3775 break;
3776
3777 case CREATE_CHAR_DEVICE:
3778 case CREATE_BLOCK_DEVICE:
3779 if (unbase64) {
3780 *invalid_config = true;
3781 return log_syntax(NULL, LOG_ERR, fname, line, SYNTHETIC_ERRNO(EBADMSG),
3782 "base64 decoding not supported for device node creation.");
3783 }
3784
3785 if (!i.argument) {
3786 *invalid_config = true;
3787 return log_syntax(NULL, LOG_ERR, fname, line, SYNTHETIC_ERRNO(EBADMSG),
3788 "Device file requires argument.");
3789 }
3790
3791 r = parse_devnum(i.argument, &i.major_minor);
3792 if (r < 0) {
3793 *invalid_config = true;
3794 return log_syntax(NULL, LOG_ERR, fname, line, r,
3795 "Can't parse device file major/minor '%s'.", i.argument);
3796 }
3797
3798 break;
3799
3800 case SET_XATTR:
3801 case RECURSIVE_SET_XATTR:
3802 if (unbase64) {
3803 *invalid_config = true;
3804 return log_syntax(NULL, LOG_ERR, fname, line, SYNTHETIC_ERRNO(EBADMSG),
3805 "base64 decoding not supported for extended attributes.");
3806 }
3807 if (!i.argument) {
3808 *invalid_config = true;
3809 return log_syntax(NULL, LOG_ERR, fname, line, SYNTHETIC_ERRNO(EBADMSG),
3810 "Set extended attribute requires argument.");
3811 }
3812 r = parse_xattrs_from_arg(&i);
3813 if (r < 0)
3814 return r;
3815 break;
3816
3817 case SET_ACL:
3818 case RECURSIVE_SET_ACL:
3819 if (unbase64) {
3820 *invalid_config = true;
3821 return log_syntax(NULL, LOG_ERR, fname, line, SYNTHETIC_ERRNO(EBADMSG),
3822 "base64 decoding not supported for ACLs.");
3823 }
3824 if (!i.argument) {
3825 *invalid_config = true;
3826 return log_syntax(NULL, LOG_ERR, fname, line, SYNTHETIC_ERRNO(EBADMSG),
3827 "Set ACLs requires argument.");
3828 }
3829 r = parse_acls_from_arg(&i);
3830 if (r < 0)
3831 return r;
3832 break;
3833
3834 case SET_ATTRIBUTE:
3835 case RECURSIVE_SET_ATTRIBUTE:
3836 if (unbase64) {
3837 *invalid_config = true;
3838 return log_syntax(NULL, LOG_ERR, fname, line, SYNTHETIC_ERRNO(EBADMSG),
3839 "base64 decoding not supported for file attributes.");
3840 }
3841 if (!i.argument) {
3842 *invalid_config = true;
3843 return log_syntax(NULL, LOG_ERR, fname, line, SYNTHETIC_ERRNO(EBADMSG),
3844 "Set file attribute requires argument.");
3845 }
3846 r = parse_attribute_from_arg(&i);
3847 if (IN_SET(r, -EINVAL, -EBADSLT))
3848 *invalid_config = true;
3849 if (r < 0)
3850 return r;
3851 break;
3852
3853 default:
3854 *invalid_config = true;
3855 return log_syntax(NULL, LOG_ERR, fname, line, SYNTHETIC_ERRNO(EBADMSG),
3856 "Unknown command type '%c'.", (char) i.type);
3857 }
3858
3859 if (!should_include_path(i.path))
3860 return 0;
3861
3862 if (!unbase64) {
3863 /* Do specifier expansion except if base64 mode is enabled */
3864 r = specifier_expansion_from_arg(specifier_table, &i);
3865 if (ERRNO_IS_NOINFO(r))
3866 return log_unresolvable_specifier(fname, line);
3867 if (r < 0) {
3868 if (IN_SET(r, -EINVAL, -EBADSLT))
3869 *invalid_config = true;
3870 return log_syntax(NULL, LOG_ERR, fname, line, r,
3871 "Failed to substitute specifiers in argument: %m");
3872 }
3873 }
3874
3875 switch (i.type) {
3876 case CREATE_SYMLINK:
3877 if (!i.argument) {
3878 i.argument = path_join("/usr/share/factory", i.path);
3879 if (!i.argument)
3880 return log_oom();
3881 }
3882 break;
3883
3884 case COPY_FILES:
3885 if (!i.argument) {
3886 i.argument = path_join("/usr/share/factory", i.path);
3887 if (!i.argument)
3888 return log_oom();
3889 } else if (!path_is_absolute(i.argument)) {
3890 *invalid_config = true;
3891 return log_syntax(NULL, LOG_ERR, fname, line, SYNTHETIC_ERRNO(EBADMSG),
3892 "Source path '%s' is not absolute.", i.argument);
3893
3894 }
3895
3896 if (!empty_or_root(arg_root)) {
3897 char *p;
3898
3899 p = path_join(arg_root, i.argument);
3900 if (!p)
3901 return log_oom();
3902 free_and_replace(i.argument, p);
3903 }
3904
3905 path_simplify(i.argument);
3906
3907 if (laccess(i.argument, F_OK) == -ENOENT) {
3908 /* Silently skip over lines where the source file is missing. */
3909 log_syntax(NULL, LOG_DEBUG, fname, line, 0,
3910 "Copy source path '%s' does not exist, skipping line.", i.argument);
3911 return 0;
3912 }
3913
3914 break;
3915
3916 default:
3917 break;
3918 }
3919
3920 if (from_cred) {
3921 if (!i.argument)
3922 return log_syntax(NULL, LOG_ERR, fname, line, SYNTHETIC_ERRNO(EINVAL),
3923 "Reading from credential requested, but no credential name specified.");
3924 if (!credential_name_valid(i.argument))
3925 return log_syntax(NULL, LOG_ERR, fname, line, SYNTHETIC_ERRNO(EINVAL),
3926 "Credential name not valid: %s", i.argument);
3927
3928 r = read_credential(i.argument, &i.binary_argument, &i.binary_argument_size);
3929 if (IN_SET(r, -ENXIO, -ENOENT)) {
3930 /* Silently skip over lines that have no credentials passed */
3931 log_syntax(NULL, LOG_DEBUG, fname, line, 0,
3932 "Credential '%s' not specified, skipping line.", i.argument);
3933 return 0;
3934 }
3935 if (r < 0)
3936 return log_error_errno(r, "Failed to read credential '%s': %m", i.argument);
3937 }
3938
3939 /* If base64 decoding is requested, do so now */
3940 if (unbase64 && item_binary_argument(&i)) {
3941 _cleanup_free_ void *data = NULL;
3942 size_t data_size = 0;
3943
3944 r = unbase64mem_full(item_binary_argument(&i), item_binary_argument_size(&i), /* secure = */ false,
3945 &data, &data_size);
3946 if (r < 0)
3947 return log_syntax(NULL, LOG_ERR, fname, line, r, "Failed to base64 decode specified argument '%s': %m", i.argument);
3948
3949 free_and_replace(i.binary_argument, data);
3950 i.binary_argument_size = data_size;
3951 }
3952
3953 if (!empty_or_root(arg_root)) {
3954 char *p;
3955
3956 p = path_join(arg_root, i.path);
3957 if (!p)
3958 return log_oom();
3959 free_and_replace(i.path, p);
3960 }
3961
3962 if (!empty_or_dash(user)) {
3963 const char *u;
3964
3965 u = startswith(user, ":");
3966 if (u)
3967 i.uid_only_create = true;
3968 else
3969 u = user;
3970
3971 r = find_uid(u, &i.uid, &c->uid_cache);
3972 if (r == -ESRCH && arg_graceful) {
3973 log_syntax(NULL, LOG_DEBUG, fname, line, r,
3974 "%s: user '%s' not found, not adjusting ownership.", i.path, u);
3975 missing_user_or_group = true;
3976 } else if (r < 0) {
3977 *invalid_config = true;
3978 return log_syntax(NULL, LOG_ERR, fname, line, r, "Failed to resolve user '%s': %m", u);
3979 } else
3980 i.uid_set = true;
3981 }
3982
3983 if (!empty_or_dash(group)) {
3984 const char *g;
3985
3986 g = startswith(group, ":");
3987 if (g)
3988 i.gid_only_create = true;
3989 else
3990 g = group;
3991
3992 r = find_gid(g, &i.gid, &c->gid_cache);
3993 if (r == -ESRCH && arg_graceful) {
3994 log_syntax(NULL, LOG_DEBUG, fname, line, r,
3995 "%s: group '%s' not found, not adjusting ownership.", i.path, g);
3996 missing_user_or_group = true;
3997 } else if (r < 0) {
3998 *invalid_config = true;
3999 return log_syntax(NULL, LOG_ERR, fname, line, r, "Failed to resolve group '%s': %m", g);
4000 } else
4001 i.gid_set = true;
4002 }
4003
4004 if (!empty_or_dash(mode)) {
4005 const char *mm;
4006 unsigned m;
4007
4008 for (mm = mode;; mm++)
4009 if (*mm == '~')
4010 i.mask_perms = true;
4011 else if (*mm == ':')
4012 i.mode_only_create = true;
4013 else
4014 break;
4015
4016 r = parse_mode(mm, &m);
4017 if (r < 0) {
4018 *invalid_config = true;
4019 return log_syntax(NULL, LOG_ERR, fname, line, r, "Invalid mode '%s'.", mode);
4020 }
4021
4022 i.mode = m;
4023 i.mode_set = true;
4024 } else
4025 i.mode = IN_SET(i.type,
4026 CREATE_DIRECTORY,
4027 TRUNCATE_DIRECTORY,
4028 CREATE_SUBVOLUME,
4029 CREATE_SUBVOLUME_INHERIT_QUOTA,
4030 CREATE_SUBVOLUME_NEW_QUOTA) ? 0755 : 0644;
4031
4032 if (missing_user_or_group && (i.mode & ~0777) != 0) {
4033 /* Refuse any special bits for nodes where we couldn't resolve the ownership properly. */
4034 mode_t adjusted = i.mode & 0777;
4035 log_syntax(NULL, LOG_INFO, fname, line, 0,
4036 "Changing mode 0%o to 0%o because of changed ownership.", i.mode, adjusted);
4037 i.mode = adjusted;
4038 }
4039
4040 if (!empty_or_dash(age)) {
4041 const char *a = age;
4042 _cleanup_free_ char *seconds = NULL, *age_by = NULL;
4043
4044 if (*a == '~') {
4045 i.keep_first_level = true;
4046 a++;
4047 }
4048
4049 /* Format: "age-by:age"; where age-by is "[abcmABCM]+". */
4050 r = split_pair(a, ":", &age_by, &seconds);
4051 if (r == -ENOMEM)
4052 return log_oom();
4053 if (r < 0 && r != -EINVAL)
4054 return log_error_errno(r, "Failed to parse age-by for '%s': %m", age);
4055 if (r >= 0) {
4056 /* We found a ":", parse the "age-by" part. */
4057 r = parse_age_by_from_arg(age_by, &i);
4058 if (r == -ENOMEM)
4059 return log_oom();
4060 if (r < 0) {
4061 *invalid_config = true;
4062 return log_syntax(NULL, LOG_ERR, fname, line, r, "Invalid age-by '%s'.", age_by);
4063 }
4064
4065 /* For parsing the "age" part, after the ":". */
4066 a = seconds;
4067 }
4068
4069 r = parse_sec(a, &i.age);
4070 if (r < 0) {
4071 *invalid_config = true;
4072 return log_syntax(NULL, LOG_ERR, fname, line, r, "Invalid age '%s'.", a);
4073 }
4074
4075 i.age_set = true;
4076 }
4077
4078 h = needs_glob(i.type) ? c->globs : c->items;
4079
4080 existing = ordered_hashmap_get(h, i.path);
4081 if (existing) {
4082 if (is_duplicated_item(existing, &i)) {
4083 log_syntax(NULL, LOG_NOTICE, fname, line, 0,
4084 "Duplicate line for path \"%s\", ignoring.", i.path);
4085 return 0;
4086 }
4087 } else {
4088 existing = new0(ItemArray, 1);
4089 if (!existing)
4090 return log_oom();
4091
4092 r = ordered_hashmap_put(h, i.path, existing);
4093 if (r < 0) {
4094 free(existing);
4095 return log_oom();
4096 }
4097 }
4098
4099 if (!GREEDY_REALLOC(existing->items, existing->n_items + 1))
4100 return log_oom();
4101
4102 existing->items[existing->n_items++] = TAKE_STRUCT(i);
4103
4104 /* Sort item array, to enforce stable ordering of application */
4105 typesafe_qsort(existing->items, existing->n_items, item_compare);
4106
4107 return 0;
4108 }
4109
4110 static int cat_config(char **config_dirs, char **args) {
4111 _cleanup_strv_free_ char **files = NULL;
4112 int r;
4113
4114 r = conf_files_list_with_replacement(arg_root, config_dirs, arg_replace, &files, NULL);
4115 if (r < 0)
4116 return r;
4117
4118 pager_open(arg_pager_flags);
4119
4120 return cat_files(NULL, files, arg_cat_flags);
4121 }
4122
4123 static int exclude_default_prefixes(void) {
4124 int r;
4125
4126 /* Provide an easy way to exclude virtual/memory file systems from what we do here. Useful in
4127 * combination with --root= where we probably don't want to apply stuff to these dirs as they are
4128 * likely over-mounted if the root directory is actually used, and it wouldbe less than ideal to have
4129 * all kinds of files created/adjusted underneath these mount points. */
4130
4131 r = strv_extend_many(
4132 &arg_exclude_prefixes,
4133 "/dev",
4134 "/proc",
4135 "/run",
4136 "/sys");
4137 if (r < 0)
4138 return log_oom();
4139
4140 strv_uniq(arg_exclude_prefixes);
4141 return 0;
4142 }
4143
4144 static int help(void) {
4145 _cleanup_free_ char *link = NULL;
4146 int r;
4147
4148 r = terminal_urlify_man("systemd-tmpfiles", "8", &link);
4149 if (r < 0)
4150 return log_oom();
4151
4152 printf("%1$s COMMAND [OPTIONS...] [CONFIGURATION FILE...]\n"
4153 "\n%2$sCreate, delete, and clean up files and directories.%4$s\n"
4154 "\n%3$sCommands:%4$s\n"
4155 " --create Create files and directories\n"
4156 " --clean Clean up files and directories\n"
4157 " --remove Remove files and directories\n"
4158 " -h --help Show this help\n"
4159 " --version Show package version\n"
4160 "\n%3$sOptions:%4$s\n"
4161 " --user Execute user configuration\n"
4162 " --cat-config Show configuration files\n"
4163 " --tldr Show non-comment parts of configuration\n"
4164 " --boot Execute actions only safe at boot\n"
4165 " --graceful Quietly ignore unknown users or groups\n"
4166 " --purge Delete all files owned by the configuration files\n"
4167 " --prefix=PATH Only apply rules with the specified prefix\n"
4168 " --exclude-prefix=PATH Ignore rules with the specified prefix\n"
4169 " -E Ignore rules prefixed with /dev, /proc, /run, /sys\n"
4170 " --root=PATH Operate on an alternate filesystem root\n"
4171 " --image=PATH Operate on disk image as filesystem root\n"
4172 " --image-policy=POLICY Specify disk image dissection policy\n"
4173 " --replace=PATH Treat arguments as replacement for PATH\n"
4174 " --dry-run Just print what would be done\n"
4175 " --no-pager Do not pipe output into a pager\n"
4176 "\nSee the %5$s for details.\n",
4177 program_invocation_short_name,
4178 ansi_highlight(),
4179 ansi_underline(),
4180 ansi_normal(),
4181 link);
4182
4183 return 0;
4184 }
4185
4186 static int parse_argv(int argc, char *argv[]) {
4187 enum {
4188 ARG_VERSION = 0x100,
4189 ARG_CAT_CONFIG,
4190 ARG_TLDR,
4191 ARG_USER,
4192 ARG_CREATE,
4193 ARG_CLEAN,
4194 ARG_REMOVE,
4195 ARG_PURGE,
4196 ARG_BOOT,
4197 ARG_GRACEFUL,
4198 ARG_PREFIX,
4199 ARG_EXCLUDE_PREFIX,
4200 ARG_ROOT,
4201 ARG_IMAGE,
4202 ARG_IMAGE_POLICY,
4203 ARG_REPLACE,
4204 ARG_DRY_RUN,
4205 ARG_NO_PAGER,
4206 };
4207
4208 static const struct option options[] = {
4209 { "help", no_argument, NULL, 'h' },
4210 { "user", no_argument, NULL, ARG_USER },
4211 { "version", no_argument, NULL, ARG_VERSION },
4212 { "cat-config", no_argument, NULL, ARG_CAT_CONFIG },
4213 { "tldr", no_argument, NULL, ARG_TLDR },
4214 { "create", no_argument, NULL, ARG_CREATE },
4215 { "clean", no_argument, NULL, ARG_CLEAN },
4216 { "remove", no_argument, NULL, ARG_REMOVE },
4217 { "purge", no_argument, NULL, ARG_PURGE },
4218 { "boot", no_argument, NULL, ARG_BOOT },
4219 { "graceful", no_argument, NULL, ARG_GRACEFUL },
4220 { "prefix", required_argument, NULL, ARG_PREFIX },
4221 { "exclude-prefix", required_argument, NULL, ARG_EXCLUDE_PREFIX },
4222 { "root", required_argument, NULL, ARG_ROOT },
4223 { "image", required_argument, NULL, ARG_IMAGE },
4224 { "image-policy", required_argument, NULL, ARG_IMAGE_POLICY },
4225 { "replace", required_argument, NULL, ARG_REPLACE },
4226 { "dry-run", no_argument, NULL, ARG_DRY_RUN },
4227 { "no-pager", no_argument, NULL, ARG_NO_PAGER },
4228 {}
4229 };
4230
4231 int c, r;
4232
4233 assert(argc >= 0);
4234 assert(argv);
4235
4236 while ((c = getopt_long(argc, argv, "hE", options, NULL)) >= 0)
4237
4238 switch (c) {
4239
4240 case 'h':
4241 return help();
4242
4243 case ARG_VERSION:
4244 return version();
4245
4246 case ARG_CAT_CONFIG:
4247 arg_cat_flags = CAT_CONFIG_ON;
4248 break;
4249
4250 case ARG_TLDR:
4251 arg_cat_flags = CAT_TLDR;
4252 break;
4253
4254 case ARG_USER:
4255 arg_runtime_scope = RUNTIME_SCOPE_USER;
4256 break;
4257
4258 case ARG_CREATE:
4259 arg_operation |= OPERATION_CREATE;
4260 break;
4261
4262 case ARG_CLEAN:
4263 arg_operation |= OPERATION_CLEAN;
4264 break;
4265
4266 case ARG_REMOVE:
4267 arg_operation |= OPERATION_REMOVE;
4268 break;
4269
4270 case ARG_BOOT:
4271 arg_boot = true;
4272 break;
4273
4274 case ARG_PURGE:
4275 arg_operation |= OPERATION_PURGE;
4276 break;
4277
4278 case ARG_GRACEFUL:
4279 arg_graceful = true;
4280 break;
4281
4282 case ARG_PREFIX:
4283 if (strv_extend(&arg_include_prefixes, optarg) < 0)
4284 return log_oom();
4285 break;
4286
4287 case ARG_EXCLUDE_PREFIX:
4288 if (strv_extend(&arg_exclude_prefixes, optarg) < 0)
4289 return log_oom();
4290 break;
4291
4292 case ARG_ROOT:
4293 r = parse_path_argument(optarg, /* suppress_root= */ false, &arg_root);
4294 if (r < 0)
4295 return r;
4296 break;
4297
4298 case ARG_IMAGE:
4299 #ifdef STANDALONE
4300 return log_error_errno(SYNTHETIC_ERRNO(EOPNOTSUPP),
4301 "This systemd-tmpfiles version is compiled without support for --image=.");
4302 #else
4303 r = parse_path_argument(optarg, /* suppress_root= */ false, &arg_image);
4304 if (r < 0)
4305 return r;
4306 #endif
4307 /* Imply -E here since it makes little sense to create files persistently in the /run mountpoint of a disk image */
4308 _fallthrough_;
4309
4310 case 'E':
4311 r = exclude_default_prefixes();
4312 if (r < 0)
4313 return r;
4314
4315 break;
4316
4317 case ARG_IMAGE_POLICY:
4318 r = parse_image_policy_argument(optarg, &arg_image_policy);
4319 if (r < 0)
4320 return r;
4321 break;
4322
4323 case ARG_REPLACE:
4324 if (!path_is_absolute(optarg))
4325 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
4326 "The argument to --replace= must be an absolute path.");
4327 if (!endswith(optarg, ".conf"))
4328 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
4329 "The argument to --replace= must have the extension '.conf'.");
4330
4331 arg_replace = optarg;
4332 break;
4333
4334 case ARG_DRY_RUN:
4335 arg_dry_run = true;
4336 break;
4337
4338 case ARG_NO_PAGER:
4339 arg_pager_flags |= PAGER_DISABLE;
4340 break;
4341
4342 case '?':
4343 return -EINVAL;
4344
4345 default:
4346 assert_not_reached();
4347 }
4348
4349 if (arg_operation == 0 && arg_cat_flags == CAT_CONFIG_OFF)
4350 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
4351 "You need to specify at least one of --clean, --create, --remove, or --purge.");
4352
4353 if (arg_replace && arg_cat_flags != CAT_CONFIG_OFF)
4354 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
4355 "Option --replace= is not supported with --cat-config/--tldr.");
4356
4357 if (arg_replace && optind >= argc)
4358 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
4359 "When --replace= is given, some configuration items must be specified.");
4360
4361 if (arg_root && arg_runtime_scope == RUNTIME_SCOPE_USER)
4362 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
4363 "Combination of --user and --root= is not supported.");
4364
4365 if (arg_image && arg_root)
4366 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
4367 "Please specify either --root= or --image=, the combination of both is not supported.");
4368
4369 return 1;
4370 }
4371
4372 static int read_config_file(
4373 Context *c,
4374 char **config_dirs,
4375 const char *fn,
4376 bool ignore_enoent,
4377 bool *invalid_config) {
4378
4379 ItemArray *ia;
4380 int r = 0;
4381
4382 assert(c);
4383 assert(fn);
4384
4385 r = conf_file_read(arg_root, (const char**) config_dirs, fn,
4386 parse_line, c, ignore_enoent, invalid_config);
4387 if (r <= 0)
4388 return r;
4389
4390 /* we have to determine age parameter for each entry of type X */
4391 ORDERED_HASHMAP_FOREACH(ia, c->globs)
4392 FOREACH_ARRAY(i, ia->items, ia->n_items) {
4393 ItemArray *ja;
4394 Item *candidate_item = NULL;
4395
4396 if (i->type != IGNORE_DIRECTORY_PATH)
4397 continue;
4398
4399 ORDERED_HASHMAP_FOREACH(ja, c->items)
4400 FOREACH_ARRAY(j, ja->items, ja->n_items) {
4401 if (!IN_SET(j->type, CREATE_DIRECTORY,
4402 TRUNCATE_DIRECTORY,
4403 CREATE_SUBVOLUME,
4404 CREATE_SUBVOLUME_INHERIT_QUOTA,
4405 CREATE_SUBVOLUME_NEW_QUOTA))
4406 continue;
4407
4408 if (path_equal(j->path, i->path)) {
4409 candidate_item = j;
4410 break;
4411 }
4412
4413 if (candidate_item
4414 ? (path_startswith(j->path, candidate_item->path) && fnmatch(i->path, j->path, FNM_PATHNAME | FNM_PERIOD) == 0)
4415 : path_startswith(i->path, j->path) != NULL)
4416 candidate_item = j;
4417 }
4418
4419 if (candidate_item && candidate_item->age_set) {
4420 i->age = candidate_item->age;
4421 i->age_set = true;
4422 }
4423 }
4424
4425 return r;
4426 }
4427
4428 static int parse_arguments(
4429 Context *c,
4430 char **config_dirs,
4431 char **args,
4432 bool *invalid_config) {
4433 int r;
4434
4435 assert(c);
4436
4437 STRV_FOREACH(arg, args) {
4438 r = read_config_file(c, config_dirs, *arg, false, invalid_config);
4439 if (r < 0)
4440 return r;
4441 }
4442
4443 return 0;
4444 }
4445
4446 static int read_config_files(
4447 Context *c,
4448 char **config_dirs,
4449 char **args,
4450 bool *invalid_config) {
4451
4452 _cleanup_strv_free_ char **files = NULL;
4453 _cleanup_free_ char *p = NULL;
4454 int r;
4455
4456 assert(c);
4457
4458 r = conf_files_list_with_replacement(arg_root, config_dirs, arg_replace, &files, &p);
4459 if (r < 0)
4460 return r;
4461
4462 STRV_FOREACH(f, files)
4463 if (p && path_equal(*f, p)) {
4464 log_debug("Parsing arguments at position \"%s\"%s", *f, special_glyph(SPECIAL_GLYPH_ELLIPSIS));
4465
4466 r = parse_arguments(c, config_dirs, args, invalid_config);
4467 if (r < 0)
4468 return r;
4469 } else
4470 /* Just warn, ignore result otherwise.
4471 * read_config_file() has some debug output, so no need to print anything. */
4472 (void) read_config_file(c, config_dirs, *f, true, invalid_config);
4473
4474 return 0;
4475 }
4476
4477 static int read_credential_lines(Context *c, bool *invalid_config) {
4478 _cleanup_free_ char *j = NULL;
4479 const char *d;
4480 int r;
4481
4482 assert(c);
4483
4484 r = get_credentials_dir(&d);
4485 if (r == -ENXIO)
4486 return 0;
4487 if (r < 0)
4488 return log_error_errno(r, "Failed to get credentials directory: %m");
4489
4490 j = path_join(d, "tmpfiles.extra");
4491 if (!j)
4492 return log_oom();
4493
4494 (void) read_config_file(c, /* config_dirs= */ NULL, j, /* ignore_enoent= */ true, invalid_config);
4495 return 0;
4496 }
4497
4498 static int link_parent(Context *c, ItemArray *a) {
4499 const char *path;
4500 char *prefix;
4501 int r;
4502
4503 assert(c);
4504 assert(a);
4505
4506 /* Finds the closest "parent" item array for the specified item array. Then registers the specified
4507 * item array as child of it, and fills the parent in, linking them both ways. This allows us to
4508 * later create parents before their children, and clean up/remove children before their parents.
4509 */
4510
4511 if (a->n_items <= 0)
4512 return 0;
4513
4514 path = a->items[0].path;
4515 prefix = newa(char, strlen(path) + 1);
4516 PATH_FOREACH_PREFIX(prefix, path) {
4517 ItemArray *j;
4518
4519 j = ordered_hashmap_get(c->items, prefix);
4520 if (!j)
4521 j = ordered_hashmap_get(c->globs, prefix);
4522 if (j) {
4523 r = set_ensure_put(&j->children, NULL, a);
4524 if (r < 0)
4525 return log_oom();
4526
4527 a->parent = j;
4528 return 1;
4529 }
4530 }
4531
4532 return 0;
4533 }
4534
4535 DEFINE_PRIVATE_HASH_OPS_WITH_VALUE_DESTRUCTOR(item_array_hash_ops, char, string_hash_func, string_compare_func,
4536 ItemArray, item_array_free);
4537
4538 static int run(int argc, char *argv[]) {
4539 #ifndef STANDALONE
4540 _cleanup_(loop_device_unrefp) LoopDevice *loop_device = NULL;
4541 _cleanup_(umount_and_freep) char *mounted_dir = NULL;
4542 #endif
4543 _cleanup_strv_free_ char **config_dirs = NULL;
4544 _cleanup_(context_done) Context c = {};
4545 bool invalid_config = false;
4546 ItemArray *a;
4547 enum {
4548 PHASE_PURGE,
4549 PHASE_REMOVE_AND_CLEAN,
4550 PHASE_CREATE,
4551 _PHASE_MAX
4552 } phase;
4553 int r, k;
4554
4555 r = parse_argv(argc, argv);
4556 if (r <= 0)
4557 return r;
4558
4559 log_setup();
4560
4561 /* We require /proc/ for a lot of our operations, i.e. for adjusting access modes, for anything
4562 * SELinux related, for recursive operation, for xattr, acl and chattr handling, for btrfs stuff and
4563 * a lot more. It's probably the majority of invocations where /proc/ is required. Since people
4564 * apparently invoke it without anyway and are surprised about the failures, let's catch this early
4565 * and output a nice and friendly warning. */
4566 if (proc_mounted() == 0)
4567 return log_error_errno(SYNTHETIC_ERRNO(ENOSYS),
4568 "/proc/ is not mounted, but required for successful operation of systemd-tmpfiles. "
4569 "Please mount /proc/. Alternatively, consider using the --root= or --image= switches.");
4570
4571 /* Descending down file system trees might take a lot of fds */
4572 (void) rlimit_nofile_bump(HIGH_RLIMIT_NOFILE);
4573
4574 switch (arg_runtime_scope) {
4575
4576 case RUNTIME_SCOPE_USER:
4577 r = user_config_paths(&config_dirs);
4578 if (r < 0)
4579 return log_error_errno(r, "Failed to initialize configuration directory list: %m");
4580 break;
4581
4582 case RUNTIME_SCOPE_SYSTEM:
4583 config_dirs = strv_split_nulstr(CONF_PATHS_NULSTR("tmpfiles.d"));
4584 if (!config_dirs)
4585 return log_oom();
4586 break;
4587
4588 default:
4589 assert_not_reached();
4590 }
4591
4592 if (DEBUG_LOGGING) {
4593 _cleanup_free_ char *t = NULL;
4594
4595 STRV_FOREACH(i, config_dirs) {
4596 _cleanup_free_ char *j = NULL;
4597
4598 j = path_join(arg_root, *i);
4599 if (!j)
4600 return log_oom();
4601
4602 if (!strextend(&t, "\n\t", j))
4603 return log_oom();
4604 }
4605
4606 log_debug("Looking for configuration files in (higher priority first):%s", t);
4607 }
4608
4609 if (arg_cat_flags != CAT_CONFIG_OFF)
4610 return cat_config(config_dirs, argv + optind);
4611
4612 umask(0022);
4613
4614 r = mac_init();
4615 if (r < 0)
4616 return r;
4617
4618 #ifndef STANDALONE
4619 if (arg_image) {
4620 assert(!arg_root);
4621
4622 r = mount_image_privately_interactively(
4623 arg_image,
4624 arg_image_policy,
4625 DISSECT_IMAGE_GENERIC_ROOT |
4626 DISSECT_IMAGE_REQUIRE_ROOT |
4627 DISSECT_IMAGE_VALIDATE_OS |
4628 DISSECT_IMAGE_RELAX_VAR_CHECK |
4629 DISSECT_IMAGE_FSCK |
4630 DISSECT_IMAGE_GROWFS |
4631 DISSECT_IMAGE_ALLOW_USERSPACE_VERITY,
4632 &mounted_dir,
4633 /* ret_dir_fd= */ NULL,
4634 &loop_device);
4635 if (r < 0)
4636 return r;
4637
4638 arg_root = strdup(mounted_dir);
4639 if (!arg_root)
4640 return log_oom();
4641 }
4642 #else
4643 assert(!arg_image);
4644 #endif
4645
4646 c.items = ordered_hashmap_new(&item_array_hash_ops);
4647 c.globs = ordered_hashmap_new(&item_array_hash_ops);
4648 if (!c.items || !c.globs)
4649 return log_oom();
4650
4651 /* If command line arguments are specified along with --replace, read all
4652 * configuration files and insert the positional arguments at the specified
4653 * place. Otherwise, if command line arguments are specified, execute just
4654 * them, and finally, without --replace= or any positional arguments, just
4655 * read configuration and execute it.
4656 */
4657 if (arg_replace || optind >= argc)
4658 r = read_config_files(&c, config_dirs, argv + optind, &invalid_config);
4659 else
4660 r = parse_arguments(&c, config_dirs, argv + optind, &invalid_config);
4661 if (r < 0)
4662 return r;
4663
4664 r = read_credential_lines(&c, &invalid_config);
4665 if (r < 0)
4666 return r;
4667
4668 /* Let's now link up all child/parent relationships */
4669 ORDERED_HASHMAP_FOREACH(a, c.items) {
4670 r = link_parent(&c, a);
4671 if (r < 0)
4672 return r;
4673 }
4674 ORDERED_HASHMAP_FOREACH(a, c.globs) {
4675 r = link_parent(&c, a);
4676 if (r < 0)
4677 return r;
4678 }
4679
4680 /* If multiple operations are requested, let's first run the remove/clean operations, and only then
4681 * the create operations. i.e. that we first clean out the platform we then build on. */
4682 for (phase = 0; phase < _PHASE_MAX; phase++) {
4683 OperationMask op;
4684
4685 if (phase == PHASE_PURGE)
4686 op = arg_operation & OPERATION_PURGE;
4687 else if (phase == PHASE_REMOVE_AND_CLEAN)
4688 op = arg_operation & (OPERATION_REMOVE|OPERATION_CLEAN);
4689 else if (phase == PHASE_CREATE)
4690 op = arg_operation & OPERATION_CREATE;
4691 else
4692 assert_not_reached();
4693
4694 if (op == 0) /* Nothing requested in this phase */
4695 continue;
4696
4697 /* The non-globbing ones usually create things, hence we apply them first */
4698 ORDERED_HASHMAP_FOREACH(a, c.items) {
4699 k = process_item_array(&c, a, op);
4700 if (k < 0 && r >= 0)
4701 r = k;
4702 }
4703
4704 /* The globbing ones usually alter things, hence we apply them second. */
4705 ORDERED_HASHMAP_FOREACH(a, c.globs) {
4706 k = process_item_array(&c, a, op);
4707 if (k < 0 && r >= 0)
4708 r = k;
4709 }
4710 }
4711
4712 if (ERRNO_IS_RESOURCE(r))
4713 return r;
4714 if (invalid_config)
4715 return EX_DATAERR;
4716 if (r < 0)
4717 return EX_CANTCREAT;
4718 return 0;
4719 }
4720
4721 DEFINE_MAIN_FUNCTION_WITH_POSITIVE_FAILURE(run);
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