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Merge pull request #17352 from msekletar/ens-names-fix
[thirdparty/systemd.git] / src / tmpfiles / tmpfiles.c
1 /* SPDX-License-Identifier: LGPL-2.1+ */
2
3 #include <errno.h>
4 #include <fcntl.h>
5 #include <fnmatch.h>
6 #include <getopt.h>
7 #include <limits.h>
8 #include <linux/fs.h>
9 #include <stdbool.h>
10 #include <stddef.h>
11 #include <stdlib.h>
12 #include <sys/file.h>
13 #include <sys/xattr.h>
14 #include <sysexits.h>
15 #include <time.h>
16 #include <unistd.h>
17
18 #include "sd-path.h"
19
20 #include "acl-util.h"
21 #include "alloc-util.h"
22 #include "btrfs-util.h"
23 #include "capability-util.h"
24 #include "chattr-util.h"
25 #include "conf-files.h"
26 #include "copy.h"
27 #include "def.h"
28 #include "dirent-util.h"
29 #include "dissect-image.h"
30 #include "escape.h"
31 #include "fd-util.h"
32 #include "fileio.h"
33 #include "format-util.h"
34 #include "fs-util.h"
35 #include "glob-util.h"
36 #include "io-util.h"
37 #include "label.h"
38 #include "log.h"
39 #include "macro.h"
40 #include "main-func.h"
41 #include "missing_stat.h"
42 #include "missing_syscall.h"
43 #include "mkdir.h"
44 #include "mount-util.h"
45 #include "mountpoint-util.h"
46 #include "offline-passwd.h"
47 #include "pager.h"
48 #include "parse-util.h"
49 #include "path-lookup.h"
50 #include "path-util.h"
51 #include "pretty-print.h"
52 #include "rlimit-util.h"
53 #include "rm-rf.h"
54 #include "selinux-util.h"
55 #include "set.h"
56 #include "sort-util.h"
57 #include "specifier.h"
58 #include "stat-util.h"
59 #include "stdio-util.h"
60 #include "string-table.h"
61 #include "string-util.h"
62 #include "strv.h"
63 #include "umask-util.h"
64 #include "user-util.h"
65
66 /* This reads all files listed in /etc/tmpfiles.d/?*.conf and creates
67 * them in the file system. This is intended to be used to create
68 * properly owned directories beneath /tmp, /var/tmp, /run, which are
69 * volatile and hence need to be recreated on bootup. */
70
71 typedef enum OperationMask {
72 OPERATION_CREATE = 1 << 0,
73 OPERATION_REMOVE = 1 << 1,
74 OPERATION_CLEAN = 1 << 2,
75 } OperationMask;
76
77 typedef enum ItemType {
78 /* These ones take file names */
79 CREATE_FILE = 'f',
80 TRUNCATE_FILE = 'F', /* deprecated: use f+ */
81 CREATE_DIRECTORY = 'd',
82 TRUNCATE_DIRECTORY = 'D',
83 CREATE_SUBVOLUME = 'v',
84 CREATE_SUBVOLUME_INHERIT_QUOTA = 'q',
85 CREATE_SUBVOLUME_NEW_QUOTA = 'Q',
86 CREATE_FIFO = 'p',
87 CREATE_SYMLINK = 'L',
88 CREATE_CHAR_DEVICE = 'c',
89 CREATE_BLOCK_DEVICE = 'b',
90 COPY_FILES = 'C',
91
92 /* These ones take globs */
93 WRITE_FILE = 'w',
94 EMPTY_DIRECTORY = 'e',
95 SET_XATTR = 't',
96 RECURSIVE_SET_XATTR = 'T',
97 SET_ACL = 'a',
98 RECURSIVE_SET_ACL = 'A',
99 SET_ATTRIBUTE = 'h',
100 RECURSIVE_SET_ATTRIBUTE = 'H',
101 IGNORE_PATH = 'x',
102 IGNORE_DIRECTORY_PATH = 'X',
103 REMOVE_PATH = 'r',
104 RECURSIVE_REMOVE_PATH = 'R',
105 RELABEL_PATH = 'z',
106 RECURSIVE_RELABEL_PATH = 'Z',
107 ADJUST_MODE = 'm', /* legacy, 'z' is identical to this */
108 } ItemType;
109
110 typedef struct Item {
111 ItemType type;
112
113 char *path;
114 char *argument;
115 char **xattrs;
116 #if HAVE_ACL
117 acl_t acl_access;
118 acl_t acl_default;
119 #endif
120 uid_t uid;
121 gid_t gid;
122 mode_t mode;
123 usec_t age;
124
125 dev_t major_minor;
126 unsigned attribute_value;
127 unsigned attribute_mask;
128
129 bool uid_set:1;
130 bool gid_set:1;
131 bool mode_set:1;
132 bool age_set:1;
133 bool mask_perms:1;
134 bool attribute_set:1;
135
136 bool keep_first_level:1;
137
138 bool append_or_force:1;
139
140 bool allow_failure:1;
141
142 OperationMask done;
143 } Item;
144
145 typedef struct ItemArray {
146 Item *items;
147 size_t n_items;
148 size_t allocated;
149
150 struct ItemArray *parent;
151 Set *children;
152 } ItemArray;
153
154 typedef enum DirectoryType {
155 DIRECTORY_RUNTIME,
156 DIRECTORY_STATE,
157 DIRECTORY_CACHE,
158 DIRECTORY_LOGS,
159 _DIRECTORY_TYPE_MAX,
160 } DirectoryType;
161
162 static bool arg_cat_config = false;
163 static bool arg_user = false;
164 static OperationMask arg_operation = 0;
165 static bool arg_boot = false;
166 static PagerFlags arg_pager_flags = 0;
167
168 static char **arg_include_prefixes = NULL;
169 static char **arg_exclude_prefixes = NULL;
170 static char *arg_root = NULL;
171 static char *arg_image = NULL;
172 static char *arg_replace = NULL;
173
174 #define MAX_DEPTH 256
175
176 static OrderedHashmap *items = NULL, *globs = NULL;
177 static Set *unix_sockets = NULL;
178
179 STATIC_DESTRUCTOR_REGISTER(items, ordered_hashmap_freep);
180 STATIC_DESTRUCTOR_REGISTER(globs, ordered_hashmap_freep);
181 STATIC_DESTRUCTOR_REGISTER(unix_sockets, set_free_freep);
182 STATIC_DESTRUCTOR_REGISTER(arg_include_prefixes, freep);
183 STATIC_DESTRUCTOR_REGISTER(arg_exclude_prefixes, freep);
184 STATIC_DESTRUCTOR_REGISTER(arg_root, freep);
185 STATIC_DESTRUCTOR_REGISTER(arg_image, freep);
186
187 static int specifier_machine_id_safe(char specifier, const void *data, const void *userdata, char **ret);
188 static int specifier_directory(char specifier, const void *data, const void *userdata, char **ret);
189
190 static const Specifier specifier_table[] = {
191 { 'm', specifier_machine_id_safe, NULL },
192 { 'b', specifier_boot_id, NULL },
193 { 'H', specifier_host_name, NULL },
194 { 'l', specifier_short_host_name, NULL },
195 { 'v', specifier_kernel_release, NULL },
196 { 'a', specifier_architecture, NULL },
197 { 'o', specifier_os_id, NULL },
198 { 'w', specifier_os_version_id, NULL },
199 { 'B', specifier_os_build_id, NULL },
200 { 'W', specifier_os_variant_id, NULL },
201
202 { 'g', specifier_group_name, NULL },
203 { 'G', specifier_group_id, NULL },
204 { 'U', specifier_user_id, NULL },
205 { 'u', specifier_user_name, NULL },
206 { 'h', specifier_user_home, NULL },
207
208 { 't', specifier_directory, UINT_TO_PTR(DIRECTORY_RUNTIME) },
209 { 'S', specifier_directory, UINT_TO_PTR(DIRECTORY_STATE) },
210 { 'C', specifier_directory, UINT_TO_PTR(DIRECTORY_CACHE) },
211 { 'L', specifier_directory, UINT_TO_PTR(DIRECTORY_LOGS) },
212 { 'T', specifier_tmp_dir, NULL },
213 { 'V', specifier_var_tmp_dir, NULL },
214 {}
215 };
216
217 static int specifier_machine_id_safe(char specifier, const void *data, const void *userdata, char **ret) {
218 int r;
219
220 /* If /etc/machine_id is missing or empty (e.g. in a chroot environment)
221 * return a recognizable error so that the caller can skip the rule
222 * gracefully. */
223
224 r = specifier_machine_id(specifier, data, userdata, ret);
225 if (IN_SET(r, -ENOENT, -ENOMEDIUM))
226 return -ENXIO;
227
228 return r;
229 }
230
231 static int specifier_directory(char specifier, const void *data, const void *userdata, char **ret) {
232 struct table_entry {
233 uint64_t type;
234 const char *suffix;
235 };
236
237 static const struct table_entry paths_system[] = {
238 [DIRECTORY_RUNTIME] = { SD_PATH_SYSTEM_RUNTIME },
239 [DIRECTORY_STATE] = { SD_PATH_SYSTEM_STATE_PRIVATE },
240 [DIRECTORY_CACHE] = { SD_PATH_SYSTEM_STATE_CACHE },
241 [DIRECTORY_LOGS] = { SD_PATH_SYSTEM_STATE_LOGS },
242 };
243
244 static const struct table_entry paths_user[] = {
245 [DIRECTORY_RUNTIME] = { SD_PATH_USER_RUNTIME },
246 [DIRECTORY_STATE] = { SD_PATH_USER_CONFIGURATION },
247 [DIRECTORY_CACHE] = { SD_PATH_USER_STATE_CACHE },
248 [DIRECTORY_LOGS] = { SD_PATH_USER_CONFIGURATION, "log" },
249 };
250
251 unsigned i;
252 const struct table_entry *paths;
253
254 assert_cc(ELEMENTSOF(paths_system) == ELEMENTSOF(paths_user));
255 paths = arg_user ? paths_user : paths_system;
256
257 i = PTR_TO_UINT(data);
258 assert(i < ELEMENTSOF(paths_system));
259
260 return sd_path_lookup(paths[i].type, paths[i].suffix, ret);
261 }
262
263 static int log_unresolvable_specifier(const char *filename, unsigned line) {
264 static bool notified = false;
265
266 /* In system mode, this is called when /etc is not fully initialized (e.g.
267 * in a chroot environment) where some specifiers are unresolvable. In user
268 * mode, this is called when some variables are not defined. These cases are
269 * not considered as an error so log at LOG_NOTICE only for the first time
270 * and then downgrade this to LOG_DEBUG for the rest. */
271
272 log_syntax(NULL,
273 notified ? LOG_DEBUG : LOG_NOTICE,
274 filename, line, 0,
275 "Failed to resolve specifier: %s, skipping",
276 arg_user ? "Required $XDG_... variable not defined" : "uninitialized /etc detected");
277
278 if (!notified)
279 log_notice("All rules containing unresolvable specifiers will be skipped.");
280
281 notified = true;
282 return 0;
283 }
284
285 static int user_config_paths(char*** ret) {
286 _cleanup_strv_free_ char **config_dirs = NULL, **data_dirs = NULL;
287 _cleanup_free_ char *persistent_config = NULL, *runtime_config = NULL, *data_home = NULL;
288 _cleanup_strv_free_ char **res = NULL;
289 int r;
290
291 r = xdg_user_dirs(&config_dirs, &data_dirs);
292 if (r < 0)
293 return r;
294
295 r = xdg_user_config_dir(&persistent_config, "/user-tmpfiles.d");
296 if (r < 0 && r != -ENXIO)
297 return r;
298
299 r = xdg_user_runtime_dir(&runtime_config, "/user-tmpfiles.d");
300 if (r < 0 && r != -ENXIO)
301 return r;
302
303 r = xdg_user_data_dir(&data_home, "/user-tmpfiles.d");
304 if (r < 0 && r != -ENXIO)
305 return r;
306
307 r = strv_extend_strv_concat(&res, config_dirs, "/user-tmpfiles.d");
308 if (r < 0)
309 return r;
310
311 r = strv_extend(&res, persistent_config);
312 if (r < 0)
313 return r;
314
315 r = strv_extend(&res, runtime_config);
316 if (r < 0)
317 return r;
318
319 r = strv_extend(&res, data_home);
320 if (r < 0)
321 return r;
322
323 r = strv_extend_strv_concat(&res, data_dirs, "/user-tmpfiles.d");
324 if (r < 0)
325 return r;
326
327 r = path_strv_make_absolute_cwd(res);
328 if (r < 0)
329 return r;
330
331 *ret = TAKE_PTR(res);
332 return 0;
333 }
334
335 static bool needs_glob(ItemType t) {
336 return IN_SET(t,
337 WRITE_FILE,
338 IGNORE_PATH,
339 IGNORE_DIRECTORY_PATH,
340 REMOVE_PATH,
341 RECURSIVE_REMOVE_PATH,
342 EMPTY_DIRECTORY,
343 ADJUST_MODE,
344 RELABEL_PATH,
345 RECURSIVE_RELABEL_PATH,
346 SET_XATTR,
347 RECURSIVE_SET_XATTR,
348 SET_ACL,
349 RECURSIVE_SET_ACL,
350 SET_ATTRIBUTE,
351 RECURSIVE_SET_ATTRIBUTE);
352 }
353
354 static bool takes_ownership(ItemType t) {
355 return IN_SET(t,
356 CREATE_FILE,
357 TRUNCATE_FILE,
358 CREATE_DIRECTORY,
359 EMPTY_DIRECTORY,
360 TRUNCATE_DIRECTORY,
361 CREATE_SUBVOLUME,
362 CREATE_SUBVOLUME_INHERIT_QUOTA,
363 CREATE_SUBVOLUME_NEW_QUOTA,
364 CREATE_FIFO,
365 CREATE_SYMLINK,
366 CREATE_CHAR_DEVICE,
367 CREATE_BLOCK_DEVICE,
368 COPY_FILES,
369 WRITE_FILE,
370 IGNORE_PATH,
371 IGNORE_DIRECTORY_PATH,
372 REMOVE_PATH,
373 RECURSIVE_REMOVE_PATH);
374 }
375
376 static struct Item* find_glob(OrderedHashmap *h, const char *match) {
377 ItemArray *j;
378
379 ORDERED_HASHMAP_FOREACH(j, h) {
380 size_t n;
381
382 for (n = 0; n < j->n_items; n++) {
383 Item *item = j->items + n;
384
385 if (fnmatch(item->path, match, FNM_PATHNAME|FNM_PERIOD) == 0)
386 return item;
387 }
388 }
389
390 return NULL;
391 }
392
393 static int load_unix_sockets(void) {
394 _cleanup_set_free_free_ Set *sockets = NULL;
395 _cleanup_fclose_ FILE *f = NULL;
396 int r;
397
398 if (unix_sockets)
399 return 0;
400
401 /* We maintain a cache of the sockets we found in /proc/net/unix to speed things up a little. */
402
403 sockets = set_new(&path_hash_ops);
404 if (!sockets)
405 return log_oom();
406
407 f = fopen("/proc/net/unix", "re");
408 if (!f)
409 return log_full_errno(errno == ENOENT ? LOG_DEBUG : LOG_WARNING, errno,
410 "Failed to open /proc/net/unix, ignoring: %m");
411
412 /* Skip header */
413 r = read_line(f, LONG_LINE_MAX, NULL);
414 if (r < 0)
415 return log_warning_errno(r, "Failed to skip /proc/net/unix header line: %m");
416 if (r == 0)
417 return log_warning_errno(SYNTHETIC_ERRNO(EIO), "Premature end of file reading /proc/net/unix.");
418
419 for (;;) {
420 _cleanup_free_ char *line = NULL, *s = NULL;
421 char *p;
422
423 r = read_line(f, LONG_LINE_MAX, &line);
424 if (r < 0)
425 return log_warning_errno(r, "Failed to read /proc/net/unix line, ignoring: %m");
426 if (r == 0) /* EOF */
427 break;
428
429 p = strchr(line, ':');
430 if (!p)
431 continue;
432
433 if (strlen(p) < 37)
434 continue;
435
436 p += 37;
437 p += strspn(p, WHITESPACE);
438 p += strcspn(p, WHITESPACE); /* skip one more word */
439 p += strspn(p, WHITESPACE);
440
441 if (*p != '/')
442 continue;
443
444 s = strdup(p);
445 if (!s)
446 return log_oom();
447
448 path_simplify(s, false);
449
450 r = set_consume(sockets, s);
451 if (r == -EEXIST)
452 continue;
453 if (r < 0)
454 return log_warning_errno(r, "Failed to add AF_UNIX socket to set, ignoring: %m");
455
456 TAKE_PTR(s);
457 }
458
459 unix_sockets = TAKE_PTR(sockets);
460 return 1;
461 }
462
463 static bool unix_socket_alive(const char *fn) {
464 assert(fn);
465
466 if (load_unix_sockets() < 0)
467 return true; /* We don't know, so assume yes */
468
469 return !!set_get(unix_sockets, (char*) fn);
470 }
471
472 static DIR* xopendirat_nomod(int dirfd, const char *path) {
473 DIR *dir;
474
475 dir = xopendirat(dirfd, path, O_NOFOLLOW|O_NOATIME);
476 if (dir)
477 return dir;
478
479 log_debug_errno(errno, "Cannot open %sdirectory \"%s\": %m", dirfd == AT_FDCWD ? "" : "sub", path);
480 if (errno != EPERM)
481 return NULL;
482
483 dir = xopendirat(dirfd, path, O_NOFOLLOW);
484 if (!dir)
485 log_debug_errno(errno, "Cannot open %sdirectory \"%s\": %m", dirfd == AT_FDCWD ? "" : "sub", path);
486
487 return dir;
488 }
489
490 static DIR* opendir_nomod(const char *path) {
491 return xopendirat_nomod(AT_FDCWD, path);
492 }
493
494 static inline nsec_t load_statx_timestamp_nsec(const struct statx_timestamp *ts) {
495 assert(ts);
496
497 if (ts->tv_sec < 0)
498 return NSEC_INFINITY;
499
500 if ((nsec_t) ts->tv_sec >= (UINT64_MAX - ts->tv_nsec) / NSEC_PER_SEC)
501 return NSEC_INFINITY;
502
503 return ts->tv_sec * NSEC_PER_SEC + ts->tv_nsec;
504 }
505
506 static int dir_cleanup(
507 Item *i,
508 const char *p,
509 DIR *d,
510 nsec_t self_atime_nsec,
511 nsec_t self_mtime_nsec,
512 nsec_t cutoff_nsec,
513 dev_t rootdev_major,
514 dev_t rootdev_minor,
515 bool mountpoint,
516 int maxdepth,
517 bool keep_this_level) {
518
519 bool deleted = false;
520 struct dirent *dent;
521 int r = 0;
522
523 FOREACH_DIRENT_ALL(dent, d, break) {
524 _cleanup_free_ char *sub_path = NULL;
525 nsec_t atime_nsec, mtime_nsec, ctime_nsec, btime_nsec;
526
527 if (dot_or_dot_dot(dent->d_name))
528 continue;
529
530 /* If statx() is supported, use it. It's preferable over fstatat() since it tells us
531 * explicitly where we are looking at a mount point, for free as side information. Determining
532 * the same information without statx() is hard, see the complexity of path_is_mount_point(),
533 * and also much slower as it requires a number of syscalls instead of just one. Hence, when
534 * we have modern statx() we use it instead of fstat() and do proper mount point checks,
535 * while on older kernels's well do traditional st_dev based detection of mount points.
536 *
537 * Using statx() for detecting mount points also has the benfit that we handle weird file
538 * systems such as overlayfs better where each file is originating from a different
539 * st_dev. */
540
541 STRUCT_STATX_DEFINE(sx);
542
543 r = statx_fallback(
544 dirfd(d), dent->d_name,
545 AT_SYMLINK_NOFOLLOW|AT_NO_AUTOMOUNT,
546 STATX_TYPE|STATX_MODE|STATX_UID|STATX_ATIME|STATX_MTIME|STATX_CTIME|STATX_BTIME,
547 &sx);
548 if (r == -ENOENT)
549 continue;
550 if (r < 0) {
551 /* FUSE, NFS mounts, SELinux might return EACCES */
552 r = log_full_errno(errno == EACCES ? LOG_DEBUG : LOG_ERR, errno,
553 "statx(%s/%s) failed: %m", p, dent->d_name);
554 continue;
555 }
556
557 if (FLAGS_SET(sx.stx_attributes_mask, STATX_ATTR_MOUNT_ROOT)) {
558 /* Yay, we have the mount point API, use it */
559 if (FLAGS_SET(sx.stx_attributes, STATX_ATTR_MOUNT_ROOT)) {
560 log_debug("Ignoring \"%s/%s\": different mount points.", p, dent->d_name);
561 continue;
562 }
563 } else {
564 /* So we might have statx() but the STATX_ATTR_MOUNT_ROOT flag is not supported, fall
565 * back to traditional stx_dev checking. */
566 if (sx.stx_dev_major != rootdev_major ||
567 sx.stx_dev_minor != rootdev_minor) {
568 log_debug("Ignoring \"%s/%s\": different filesystem.", p, dent->d_name);
569 continue;
570 }
571
572 /* Try to detect bind mounts of the same filesystem instance; they do not differ in device
573 * major/minors. This type of query is not supported on all kernels or filesystem types
574 * though. */
575 if (S_ISDIR(sx.stx_mode)) {
576 int q;
577
578 q = fd_is_mount_point(dirfd(d), dent->d_name, 0);
579 if (q < 0)
580 log_debug_errno(q, "Failed to determine whether \"%s/%s\" is a mount point, ignoring: %m", p, dent->d_name);
581 else if (q > 0) {
582 log_debug("Ignoring \"%s/%s\": different mount of the same filesystem.", p, dent->d_name);
583 continue;
584 }
585 }
586 }
587
588 atime_nsec = FLAGS_SET(sx.stx_mask, STATX_ATIME) ? load_statx_timestamp_nsec(&sx.stx_atime) : 0;
589 mtime_nsec = FLAGS_SET(sx.stx_mask, STATX_MTIME) ? load_statx_timestamp_nsec(&sx.stx_mtime) : 0;
590 ctime_nsec = FLAGS_SET(sx.stx_mask, STATX_CTIME) ? load_statx_timestamp_nsec(&sx.stx_ctime) : 0;
591 btime_nsec = FLAGS_SET(sx.stx_mask, STATX_BTIME) ? load_statx_timestamp_nsec(&sx.stx_btime) : 0;
592
593 sub_path = path_join(p, dent->d_name);
594 if (!sub_path) {
595 r = log_oom();
596 goto finish;
597 }
598
599 /* Is there an item configured for this path? */
600 if (ordered_hashmap_get(items, sub_path)) {
601 log_debug("Ignoring \"%s\": a separate entry exists.", sub_path);
602 continue;
603 }
604
605 if (find_glob(globs, sub_path)) {
606 log_debug("Ignoring \"%s\": a separate glob exists.", sub_path);
607 continue;
608 }
609
610 if (S_ISDIR(sx.stx_mode)) {
611 _cleanup_closedir_ DIR *sub_dir = NULL;
612
613 if (mountpoint &&
614 streq(dent->d_name, "lost+found") &&
615 sx.stx_uid == 0) {
616 log_debug("Ignoring directory \"%s\".", sub_path);
617 continue;
618 }
619
620 if (maxdepth <= 0)
621 log_warning("Reached max depth on \"%s\".", sub_path);
622 else {
623 int q;
624
625 sub_dir = xopendirat_nomod(dirfd(d), dent->d_name);
626 if (!sub_dir) {
627 if (errno != ENOENT)
628 r = log_warning_errno(errno, "Opening directory \"%s\" failed, ignoring: %m", sub_path);
629
630 continue;
631 }
632
633 if (flock(dirfd(sub_dir), LOCK_EX|LOCK_NB) < 0) {
634 log_debug_errno(errno, "Couldn't acquire shared BSD lock on directory \"%s\", skipping: %m", p);
635 continue;
636 }
637
638 q = dir_cleanup(i,
639 sub_path, sub_dir,
640 atime_nsec, mtime_nsec, cutoff_nsec,
641 rootdev_major, rootdev_minor,
642 false, maxdepth-1, false);
643 if (q < 0)
644 r = q;
645 }
646
647 /* Note: if you are wondering why we don't support the sticky bit for excluding
648 * directories from cleaning like we do it for other file system objects: well, the
649 * sticky bit already has a meaning for directories, so we don't want to overload
650 * that. */
651
652 if (keep_this_level) {
653 log_debug("Keeping directory \"%s\".", sub_path);
654 continue;
655 }
656
657 /* Ignore ctime, we change it when deleting */
658 if (mtime_nsec != NSEC_INFINITY && mtime_nsec >= cutoff_nsec) {
659 char a[FORMAT_TIMESTAMP_MAX];
660 /* Follows spelling in stat(1). */
661 log_debug("Directory \"%s\": modify time %s is too new.",
662 sub_path,
663 format_timestamp_style(a, sizeof(a), mtime_nsec / NSEC_PER_USEC, TIMESTAMP_US));
664 continue;
665 }
666
667 if (atime_nsec != NSEC_INFINITY && atime_nsec >= cutoff_nsec) {
668 char a[FORMAT_TIMESTAMP_MAX];
669 log_debug("Directory \"%s\": access time %s is too new.",
670 sub_path,
671 format_timestamp_style(a, sizeof(a), atime_nsec / NSEC_PER_USEC, TIMESTAMP_US));
672 continue;
673 }
674
675 if (btime_nsec != NSEC_INFINITY && btime_nsec >= cutoff_nsec) {
676 char a[FORMAT_TIMESTAMP_MAX];
677 log_debug("Directory \"%s\": birth time %s is too new.",
678 sub_path,
679 format_timestamp_style(a, sizeof(a), btime_nsec / NSEC_PER_USEC, TIMESTAMP_US));
680 continue;
681 }
682
683 log_debug("Removing directory \"%s\".", sub_path);
684 if (unlinkat(dirfd(d), dent->d_name, AT_REMOVEDIR) < 0)
685 if (!IN_SET(errno, ENOENT, ENOTEMPTY))
686 r = log_warning_errno(errno, "Failed to remove directory \"%s\", ignoring: %m", sub_path);
687
688 } else {
689 /* Skip files for which the sticky bit is set. These are semantics we define, and are
690 * unknown elsewhere. See XDG_RUNTIME_DIR specification for details. */
691 if (sx.stx_mode & S_ISVTX) {
692 log_debug("Skipping \"%s\": sticky bit set.", sub_path);
693 continue;
694 }
695
696 if (mountpoint &&
697 S_ISREG(sx.stx_mode) &&
698 sx.stx_uid == 0 &&
699 STR_IN_SET(dent->d_name,
700 ".journal",
701 "aquota.user",
702 "aquota.group")) {
703 log_debug("Skipping \"%s\".", sub_path);
704 continue;
705 }
706
707 /* Ignore sockets that are listed in /proc/net/unix */
708 if (S_ISSOCK(sx.stx_mode) && unix_socket_alive(sub_path)) {
709 log_debug("Skipping \"%s\": live socket.", sub_path);
710 continue;
711 }
712
713 /* Ignore device nodes */
714 if (S_ISCHR(sx.stx_mode) || S_ISBLK(sx.stx_mode)) {
715 log_debug("Skipping \"%s\": a device.", sub_path);
716 continue;
717 }
718
719 /* Keep files on this level around if this is requested */
720 if (keep_this_level) {
721 log_debug("Keeping \"%s\".", sub_path);
722 continue;
723 }
724
725 if (mtime_nsec != NSEC_INFINITY && mtime_nsec >= cutoff_nsec) {
726 char a[FORMAT_TIMESTAMP_MAX];
727 /* Follows spelling in stat(1). */
728 log_debug("File \"%s\": modify time %s is too new.",
729 sub_path,
730 format_timestamp_style(a, sizeof(a), mtime_nsec / NSEC_PER_USEC, TIMESTAMP_US));
731 continue;
732 }
733
734 if (atime_nsec != NSEC_INFINITY && atime_nsec >= cutoff_nsec) {
735 char a[FORMAT_TIMESTAMP_MAX];
736 log_debug("File \"%s\": access time %s is too new.",
737 sub_path,
738 format_timestamp_style(a, sizeof(a), atime_nsec / NSEC_PER_USEC, TIMESTAMP_US));
739 continue;
740 }
741
742 if (ctime_nsec != NSEC_INFINITY && ctime_nsec >= cutoff_nsec) {
743 char a[FORMAT_TIMESTAMP_MAX];
744 log_debug("File \"%s\": change time %s is too new.",
745 sub_path,
746 format_timestamp_style(a, sizeof(a), ctime_nsec / NSEC_PER_USEC, TIMESTAMP_US));
747 continue;
748 }
749
750 if (btime_nsec != NSEC_INFINITY && btime_nsec >= cutoff_nsec) {
751 char a[FORMAT_TIMESTAMP_MAX];
752 log_debug("File \"%s\": birth time %s is too new.",
753 sub_path,
754 format_timestamp_style(a, sizeof(a), btime_nsec / NSEC_PER_USEC, TIMESTAMP_US));
755 continue;
756 }
757
758 log_debug("Removing \"%s\".", sub_path);
759 if (unlinkat(dirfd(d), dent->d_name, 0) < 0)
760 if (errno != ENOENT)
761 r = log_warning_errno(errno, "Failed to remove \"%s\", ignoring: %m", sub_path);
762
763 deleted = true;
764 }
765 }
766
767 finish:
768 if (deleted) {
769 char a[FORMAT_TIMESTAMP_MAX], m[FORMAT_TIMESTAMP_MAX];
770 struct timespec ts[2];
771
772 log_debug("Restoring access and modification time on \"%s\": %s, %s",
773 p,
774 format_timestamp_style(a, sizeof(a), self_atime_nsec / NSEC_PER_USEC, TIMESTAMP_US),
775 format_timestamp_style(m, sizeof(m), self_mtime_nsec / NSEC_PER_USEC, TIMESTAMP_US));
776
777 timespec_store_nsec(ts + 0, self_atime_nsec);
778 timespec_store_nsec(ts + 1, self_mtime_nsec);
779
780 /* Restore original directory timestamps */
781 if (futimens(dirfd(d), ts) < 0)
782 log_warning_errno(errno, "Failed to revert timestamps of '%s', ignoring: %m", p);
783 }
784
785 return r;
786 }
787
788 static bool dangerous_hardlinks(void) {
789 _cleanup_free_ char *value = NULL;
790 static int cached = -1;
791 int r;
792
793 /* Check whether the fs.protected_hardlinks sysctl is on. If we can't determine it we assume its off, as that's
794 * what the upstream default is. */
795
796 if (cached >= 0)
797 return cached;
798
799 r = read_one_line_file("/proc/sys/fs/protected_hardlinks", &value);
800 if (r < 0) {
801 log_debug_errno(r, "Failed to read fs.protected_hardlinks sysctl: %m");
802 return true;
803 }
804
805 r = parse_boolean(value);
806 if (r < 0) {
807 log_debug_errno(r, "Failed to parse fs.protected_hardlinks sysctl: %m");
808 return true;
809 }
810
811 cached = r == 0;
812 return cached;
813 }
814
815 static bool hardlink_vulnerable(const struct stat *st) {
816 assert(st);
817
818 return !S_ISDIR(st->st_mode) && st->st_nlink > 1 && dangerous_hardlinks();
819 }
820
821 static mode_t process_mask_perms(mode_t mode, mode_t current) {
822
823 if ((current & 0111) == 0)
824 mode &= ~0111;
825 if ((current & 0222) == 0)
826 mode &= ~0222;
827 if ((current & 0444) == 0)
828 mode &= ~0444;
829 if (!S_ISDIR(current))
830 mode &= ~07000; /* remove sticky/sgid/suid bit, unless directory */
831
832 return mode;
833 }
834
835 static int fd_set_perms(Item *i, int fd, const char *path, const struct stat *st) {
836 struct stat stbuf;
837 mode_t new_mode;
838 bool do_chown;
839 int r;
840
841 assert(i);
842 assert(fd);
843 assert(path);
844
845 if (!i->mode_set && !i->uid_set && !i->gid_set)
846 goto shortcut;
847
848 if (!st) {
849 if (fstat(fd, &stbuf) < 0)
850 return log_error_errno(errno, "fstat(%s) failed: %m", path);
851 st = &stbuf;
852 }
853
854 if (hardlink_vulnerable(st))
855 return log_error_errno(SYNTHETIC_ERRNO(EPERM),
856 "Refusing to set permissions on hardlinked file %s while the fs.protected_hardlinks sysctl is turned off.",
857 path);
858
859 /* Do we need a chown()? */
860 do_chown =
861 (i->uid_set && i->uid != st->st_uid) ||
862 (i->gid_set && i->gid != st->st_gid);
863
864 /* Calculate the mode to apply */
865 new_mode = i->mode_set ? (i->mask_perms ?
866 process_mask_perms(i->mode, st->st_mode) :
867 i->mode) :
868 (st->st_mode & 07777);
869
870 if (i->mode_set && do_chown) {
871 /* Before we issue the chmod() let's reduce the access mode to the common bits of the old and
872 * the new mode. That way there's no time window where the file exists under the old owner
873 * with more than the old access modes — and not under the new owner with more than the new
874 * access modes either. */
875
876 if (S_ISLNK(st->st_mode))
877 log_debug("Skipping temporary mode fix for symlink %s.", path);
878 else {
879 mode_t m = new_mode & st->st_mode; /* Mask new mode by old mode */
880
881 if (((m ^ st->st_mode) & 07777) == 0)
882 log_debug("\"%s\" matches temporary mode %o already.", path, m);
883 else {
884 log_debug("Temporarily changing \"%s\" to mode %o.", path, m);
885 r = fchmod_opath(fd, m);
886 if (r < 0)
887 return log_error_errno(r, "fchmod() of %s failed: %m", path);
888 }
889 }
890 }
891
892 if (do_chown) {
893 log_debug("Changing \"%s\" to owner "UID_FMT":"GID_FMT,
894 path,
895 i->uid_set ? i->uid : UID_INVALID,
896 i->gid_set ? i->gid : GID_INVALID);
897
898 if (fchownat(fd,
899 "",
900 i->uid_set ? i->uid : UID_INVALID,
901 i->gid_set ? i->gid : GID_INVALID,
902 AT_EMPTY_PATH) < 0)
903 return log_error_errno(errno, "fchownat() of %s failed: %m", path);
904 }
905
906 /* Now, apply the final mode. We do this in two cases: when the user set a mode explicitly, or after a
907 * chown(), since chown()'s mangle the access mode in regards to sgid/suid in some conditions. */
908 if (i->mode_set || do_chown) {
909 if (S_ISLNK(st->st_mode))
910 log_debug("Skipping mode fix for symlink %s.", path);
911 else {
912 /* Check if the chmod() is unnecessary. Note that if we did a chown() before we always
913 * chmod() here again, since it might have mangled the bits. */
914 if (!do_chown && ((new_mode ^ st->st_mode) & 07777) == 0)
915 log_debug("\"%s\" matches mode %o already.", path, new_mode);
916 else {
917 log_debug("Changing \"%s\" to mode %o.", path, new_mode);
918 r = fchmod_opath(fd, new_mode);
919 if (r < 0)
920 return log_error_errno(r, "fchmod() of %s failed: %m", path);
921 }
922 }
923 }
924
925 shortcut:
926 return label_fix(path, 0);
927 }
928
929 static int path_open_parent_safe(const char *path) {
930 _cleanup_free_ char *dn = NULL;
931 int r, fd;
932
933 if (path_equal(path, "/") || !path_is_normalized(path))
934 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
935 "Failed to open parent of '%s': invalid path.",
936 path);
937
938 dn = dirname_malloc(path);
939 if (!dn)
940 return log_oom();
941
942 r = chase_symlinks(dn, arg_root, CHASE_SAFE|CHASE_WARN, NULL, &fd);
943 if (r < 0 && r != -ENOLINK)
944 return log_error_errno(r, "Failed to validate path %s: %m", path);
945
946 return r < 0 ? r : fd;
947 }
948
949 static int path_open_safe(const char *path) {
950 int r, fd;
951
952 /* path_open_safe() returns a file descriptor opened with O_PATH after
953 * verifying that the path doesn't contain unsafe transitions, except
954 * for its final component as the function does not follow symlink. */
955
956 assert(path);
957
958 if (!path_is_normalized(path))
959 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
960 "Failed to open invalid path '%s'.",
961 path);
962
963 r = chase_symlinks(path, arg_root, CHASE_SAFE|CHASE_WARN|CHASE_NOFOLLOW, NULL, &fd);
964 if (r < 0 && r != -ENOLINK)
965 return log_error_errno(r, "Failed to validate path %s: %m", path);
966
967 return r < 0 ? r : fd;
968 }
969
970 static int path_set_perms(Item *i, const char *path) {
971 _cleanup_close_ int fd = -1;
972
973 assert(i);
974 assert(path);
975
976 fd = path_open_safe(path);
977 if (fd < 0)
978 return fd;
979
980 return fd_set_perms(i, fd, path, NULL);
981 }
982
983 static int parse_xattrs_from_arg(Item *i) {
984 const char *p;
985 int r;
986
987 assert(i);
988 assert(i->argument);
989
990 p = i->argument;
991
992 for (;;) {
993 _cleanup_free_ char *name = NULL, *value = NULL, *xattr = NULL;
994
995 r = extract_first_word(&p, &xattr, NULL, EXTRACT_UNQUOTE|EXTRACT_CUNESCAPE);
996 if (r < 0)
997 log_warning_errno(r, "Failed to parse extended attribute '%s', ignoring: %m", p);
998 if (r <= 0)
999 break;
1000
1001 r = split_pair(xattr, "=", &name, &value);
1002 if (r < 0) {
1003 log_warning_errno(r, "Failed to parse extended attribute, ignoring: %s", xattr);
1004 continue;
1005 }
1006
1007 if (isempty(name) || isempty(value)) {
1008 log_warning("Malformed extended attribute found, ignoring: %s", xattr);
1009 continue;
1010 }
1011
1012 if (strv_push_pair(&i->xattrs, name, value) < 0)
1013 return log_oom();
1014
1015 name = value = NULL;
1016 }
1017
1018 return 0;
1019 }
1020
1021 static int fd_set_xattrs(Item *i, int fd, const char *path, const struct stat *st) {
1022 char procfs_path[STRLEN("/proc/self/fd/") + DECIMAL_STR_MAX(int)];
1023 char **name, **value;
1024
1025 assert(i);
1026 assert(fd);
1027 assert(path);
1028
1029 xsprintf(procfs_path, "/proc/self/fd/%i", fd);
1030
1031 STRV_FOREACH_PAIR(name, value, i->xattrs) {
1032 log_debug("Setting extended attribute '%s=%s' on %s.", *name, *value, path);
1033 if (setxattr(procfs_path, *name, *value, strlen(*value), 0) < 0)
1034 return log_error_errno(errno, "Setting extended attribute %s=%s on %s failed: %m",
1035 *name, *value, path);
1036 }
1037 return 0;
1038 }
1039
1040 static int path_set_xattrs(Item *i, const char *path) {
1041 _cleanup_close_ int fd = -1;
1042
1043 assert(i);
1044 assert(path);
1045
1046 fd = path_open_safe(path);
1047 if (fd < 0)
1048 return fd;
1049
1050 return fd_set_xattrs(i, fd, path, NULL);
1051 }
1052
1053 static int parse_acls_from_arg(Item *item) {
1054 #if HAVE_ACL
1055 int r;
1056
1057 assert(item);
1058
1059 /* If append_or_force (= modify) is set, we will not modify the acl
1060 * afterwards, so the mask can be added now if necessary. */
1061
1062 r = parse_acl(item->argument, &item->acl_access, &item->acl_default, !item->append_or_force);
1063 if (r < 0)
1064 log_warning_errno(r, "Failed to parse ACL \"%s\": %m. Ignoring", item->argument);
1065 #else
1066 log_warning("ACLs are not supported. Ignoring.");
1067 #endif
1068
1069 return 0;
1070 }
1071
1072 #if HAVE_ACL
1073 static int path_set_acl(const char *path, const char *pretty, acl_type_t type, acl_t acl, bool modify) {
1074 _cleanup_(acl_free_charpp) char *t = NULL;
1075 _cleanup_(acl_freep) acl_t dup = NULL;
1076 int r;
1077
1078 /* Returns 0 for success, positive error if already warned,
1079 * negative error otherwise. */
1080
1081 if (modify) {
1082 r = acls_for_file(path, type, acl, &dup);
1083 if (r < 0)
1084 return r;
1085
1086 r = calc_acl_mask_if_needed(&dup);
1087 if (r < 0)
1088 return r;
1089 } else {
1090 dup = acl_dup(acl);
1091 if (!dup)
1092 return -errno;
1093
1094 /* the mask was already added earlier if needed */
1095 }
1096
1097 r = add_base_acls_if_needed(&dup, path);
1098 if (r < 0)
1099 return r;
1100
1101 t = acl_to_any_text(dup, NULL, ',', TEXT_ABBREVIATE);
1102 log_debug("Setting %s ACL %s on %s.",
1103 type == ACL_TYPE_ACCESS ? "access" : "default",
1104 strna(t), pretty);
1105
1106 r = acl_set_file(path, type, dup);
1107 if (r < 0)
1108 /* Return positive to indicate we already warned */
1109 return -log_error_errno(errno,
1110 "Setting %s ACL \"%s\" on %s failed: %m",
1111 type == ACL_TYPE_ACCESS ? "access" : "default",
1112 strna(t), pretty);
1113
1114 return 0;
1115 }
1116 #endif
1117
1118 static int fd_set_acls(Item *item, int fd, const char *path, const struct stat *st) {
1119 int r = 0;
1120 #if HAVE_ACL
1121 char procfs_path[STRLEN("/proc/self/fd/") + DECIMAL_STR_MAX(int)];
1122 struct stat stbuf;
1123
1124 assert(item);
1125 assert(fd);
1126 assert(path);
1127
1128 if (!st) {
1129 if (fstat(fd, &stbuf) < 0)
1130 return log_error_errno(errno, "fstat(%s) failed: %m", path);
1131 st = &stbuf;
1132 }
1133
1134 if (hardlink_vulnerable(st))
1135 return log_error_errno(SYNTHETIC_ERRNO(EPERM),
1136 "Refusing to set ACLs on hardlinked file %s while the fs.protected_hardlinks sysctl is turned off.",
1137 path);
1138
1139 if (S_ISLNK(st->st_mode)) {
1140 log_debug("Skipping ACL fix for symlink %s.", path);
1141 return 0;
1142 }
1143
1144 xsprintf(procfs_path, "/proc/self/fd/%i", fd);
1145
1146 if (item->acl_access)
1147 r = path_set_acl(procfs_path, path, ACL_TYPE_ACCESS, item->acl_access, item->append_or_force);
1148
1149 /* set only default acls to folders */
1150 if (r == 0 && item->acl_default && S_ISDIR(st->st_mode))
1151 r = path_set_acl(procfs_path, path, ACL_TYPE_DEFAULT, item->acl_default, item->append_or_force);
1152
1153 if (r > 0)
1154 return -r; /* already warned */
1155
1156 /* The above procfs paths don't work if /proc is not mounted. */
1157 if (r == -ENOENT && proc_mounted() == 0)
1158 r = -ENOSYS;
1159
1160 if (r == -EOPNOTSUPP) {
1161 log_debug_errno(r, "ACLs not supported by file system at %s", path);
1162 return 0;
1163 }
1164 if (r < 0)
1165 return log_error_errno(r, "ACL operation on \"%s\" failed: %m", path);
1166 #endif
1167 return r;
1168 }
1169
1170 static int path_set_acls(Item *item, const char *path) {
1171 int r = 0;
1172 #if HAVE_ACL
1173 _cleanup_close_ int fd = -1;
1174
1175 assert(item);
1176 assert(path);
1177
1178 fd = path_open_safe(path);
1179 if (fd < 0)
1180 return fd;
1181
1182 r = fd_set_acls(item, fd, path, NULL);
1183 #endif
1184 return r;
1185 }
1186
1187 static int parse_attribute_from_arg(Item *item) {
1188
1189 static const struct {
1190 char character;
1191 unsigned value;
1192 } attributes[] = {
1193 { 'A', FS_NOATIME_FL }, /* do not update atime */
1194 { 'S', FS_SYNC_FL }, /* Synchronous updates */
1195 { 'D', FS_DIRSYNC_FL }, /* dirsync behaviour (directories only) */
1196 { 'a', FS_APPEND_FL }, /* writes to file may only append */
1197 { 'c', FS_COMPR_FL }, /* Compress file */
1198 { 'd', FS_NODUMP_FL }, /* do not dump file */
1199 { 'e', FS_EXTENT_FL }, /* Extents */
1200 { 'i', FS_IMMUTABLE_FL }, /* Immutable file */
1201 { 'j', FS_JOURNAL_DATA_FL }, /* Reserved for ext3 */
1202 { 's', FS_SECRM_FL }, /* Secure deletion */
1203 { 'u', FS_UNRM_FL }, /* Undelete */
1204 { 't', FS_NOTAIL_FL }, /* file tail should not be merged */
1205 { 'T', FS_TOPDIR_FL }, /* Top of directory hierarchies */
1206 { 'C', FS_NOCOW_FL }, /* Do not cow file */
1207 { 'P', FS_PROJINHERIT_FL }, /* Inherit the quota project ID */
1208 };
1209
1210 enum {
1211 MODE_ADD,
1212 MODE_DEL,
1213 MODE_SET
1214 } mode = MODE_ADD;
1215
1216 unsigned value = 0, mask = 0;
1217 const char *p;
1218
1219 assert(item);
1220
1221 p = item->argument;
1222 if (p) {
1223 if (*p == '+') {
1224 mode = MODE_ADD;
1225 p++;
1226 } else if (*p == '-') {
1227 mode = MODE_DEL;
1228 p++;
1229 } else if (*p == '=') {
1230 mode = MODE_SET;
1231 p++;
1232 }
1233 }
1234
1235 if (isempty(p) && mode != MODE_SET)
1236 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
1237 "Setting file attribute on '%s' needs an attribute specification.",
1238 item->path);
1239
1240 for (; p && *p ; p++) {
1241 unsigned i, v;
1242
1243 for (i = 0; i < ELEMENTSOF(attributes); i++)
1244 if (*p == attributes[i].character)
1245 break;
1246
1247 if (i >= ELEMENTSOF(attributes))
1248 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
1249 "Unknown file attribute '%c' on '%s'.",
1250 *p, item->path);
1251
1252 v = attributes[i].value;
1253
1254 SET_FLAG(value, v, IN_SET(mode, MODE_ADD, MODE_SET));
1255
1256 mask |= v;
1257 }
1258
1259 if (mode == MODE_SET)
1260 mask |= CHATTR_ALL_FL;
1261
1262 assert(mask != 0);
1263
1264 item->attribute_mask = mask;
1265 item->attribute_value = value;
1266 item->attribute_set = true;
1267
1268 return 0;
1269 }
1270
1271 static int fd_set_attribute(Item *item, int fd, const char *path, const struct stat *st) {
1272 _cleanup_close_ int procfs_fd = -1;
1273 struct stat stbuf;
1274 unsigned f;
1275 int r;
1276
1277 assert(item);
1278 assert(fd);
1279 assert(path);
1280
1281 if (!item->attribute_set || item->attribute_mask == 0)
1282 return 0;
1283
1284 if (!st) {
1285 if (fstat(fd, &stbuf) < 0)
1286 return log_error_errno(errno, "fstat(%s) failed: %m", path);
1287 st = &stbuf;
1288 }
1289
1290 /* Issuing the file attribute ioctls on device nodes is not
1291 * safe, as that will be delivered to the drivers, not the
1292 * file system containing the device node. */
1293 if (!S_ISREG(st->st_mode) && !S_ISDIR(st->st_mode))
1294 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
1295 "Setting file flags is only supported on regular files and directories, cannot set on '%s'.",
1296 path);
1297
1298 f = item->attribute_value & item->attribute_mask;
1299
1300 /* Mask away directory-specific flags */
1301 if (!S_ISDIR(st->st_mode))
1302 f &= ~FS_DIRSYNC_FL;
1303
1304 procfs_fd = fd_reopen(fd, O_RDONLY|O_CLOEXEC|O_NOATIME);
1305 if (procfs_fd < 0)
1306 return log_error_errno(procfs_fd, "Failed to re-open '%s': %m", path);
1307
1308 r = chattr_fd(procfs_fd, f, item->attribute_mask, NULL);
1309 if (r < 0)
1310 log_full_errno(IN_SET(r, -ENOTTY, -EOPNOTSUPP) ? LOG_DEBUG : LOG_WARNING,
1311 r,
1312 "Cannot set file attribute for '%s', value=0x%08x, mask=0x%08x, ignoring: %m",
1313 path, item->attribute_value, item->attribute_mask);
1314
1315 return 0;
1316 }
1317
1318 static int path_set_attribute(Item *item, const char *path) {
1319 _cleanup_close_ int fd = -1;
1320
1321 if (!item->attribute_set || item->attribute_mask == 0)
1322 return 0;
1323
1324 fd = path_open_safe(path);
1325 if (fd < 0)
1326 return fd;
1327
1328 return fd_set_attribute(item, fd, path, NULL);
1329 }
1330
1331 static int write_one_file(Item *i, const char *path) {
1332 _cleanup_close_ int fd = -1, dir_fd = -1;
1333 char *bn;
1334 int r;
1335
1336 assert(i);
1337 assert(path);
1338 assert(i->argument);
1339 assert(i->type == WRITE_FILE);
1340
1341 /* Validate the path and keep the fd on the directory for opening the
1342 * file so we're sure that it can't be changed behind our back. */
1343 dir_fd = path_open_parent_safe(path);
1344 if (dir_fd < 0)
1345 return dir_fd;
1346
1347 bn = basename(path);
1348
1349 /* Follows symlinks */
1350 fd = openat(dir_fd, bn,
1351 O_NONBLOCK|O_CLOEXEC|O_WRONLY|O_NOCTTY|(i->append_or_force ? O_APPEND : 0),
1352 i->mode);
1353 if (fd < 0) {
1354 if (errno == ENOENT) {
1355 log_debug_errno(errno, "Not writing missing file \"%s\": %m", path);
1356 return 0;
1357 }
1358
1359 if (i->allow_failure)
1360 return log_debug_errno(errno, "Failed to open file \"%s\", ignoring: %m", path);
1361
1362 return log_error_errno(errno, "Failed to open file \"%s\": %m", path);
1363 }
1364
1365 /* 'w' is allowed to write into any kind of files. */
1366 log_debug("Writing to \"%s\".", path);
1367
1368 r = loop_write(fd, i->argument, strlen(i->argument), false);
1369 if (r < 0)
1370 return log_error_errno(r, "Failed to write file \"%s\": %m", path);
1371
1372 return fd_set_perms(i, fd, path, NULL);
1373 }
1374
1375 static int create_file(Item *i, const char *path) {
1376 _cleanup_close_ int fd = -1, dir_fd = -1;
1377 struct stat stbuf, *st = NULL;
1378 int r = 0;
1379 char *bn;
1380
1381 assert(i);
1382 assert(path);
1383 assert(i->type == CREATE_FILE);
1384
1385 /* 'f' operates on regular files exclusively. */
1386
1387 /* Validate the path and keep the fd on the directory for opening the
1388 * file so we're sure that it can't be changed behind our back. */
1389 dir_fd = path_open_parent_safe(path);
1390 if (dir_fd < 0)
1391 return dir_fd;
1392
1393 bn = basename(path);
1394
1395 RUN_WITH_UMASK(0000) {
1396 mac_selinux_create_file_prepare(path, S_IFREG);
1397 fd = openat(dir_fd, bn, O_CREAT|O_EXCL|O_NOFOLLOW|O_NONBLOCK|O_CLOEXEC|O_WRONLY|O_NOCTTY, i->mode);
1398 mac_selinux_create_file_clear();
1399 }
1400
1401 if (fd < 0) {
1402 /* Even on a read-only filesystem, open(2) returns EEXIST if the
1403 * file already exists. It returns EROFS only if it needs to
1404 * create the file. */
1405 if (errno != EEXIST)
1406 return log_error_errno(errno, "Failed to create file %s: %m", path);
1407
1408 /* Re-open the file. At that point it must exist since open(2)
1409 * failed with EEXIST. We still need to check if the perms/mode
1410 * need to be changed. For read-only filesystems, we let
1411 * fd_set_perms() report the error if the perms need to be
1412 * modified. */
1413 fd = openat(dir_fd, bn, O_NOFOLLOW|O_CLOEXEC|O_PATH, i->mode);
1414 if (fd < 0)
1415 return log_error_errno(errno, "Failed to re-open file %s: %m", path);
1416
1417 if (fstat(fd, &stbuf) < 0)
1418 return log_error_errno(errno, "stat(%s) failed: %m", path);
1419
1420 if (!S_ISREG(stbuf.st_mode))
1421 return log_error_errno(SYNTHETIC_ERRNO(EEXIST),
1422 "%s exists and is not a regular file.",
1423 path);
1424
1425 st = &stbuf;
1426 } else {
1427
1428 log_debug("\"%s\" has been created.", path);
1429
1430 if (i->argument) {
1431 log_debug("Writing to \"%s\".", path);
1432
1433 r = loop_write(fd, i->argument, strlen(i->argument), false);
1434 if (r < 0)
1435 return log_error_errno(r, "Failed to write file \"%s\": %m", path);
1436 }
1437 }
1438
1439 return fd_set_perms(i, fd, path, st);
1440 }
1441
1442 static int truncate_file(Item *i, const char *path) {
1443 _cleanup_close_ int fd = -1, dir_fd = -1;
1444 struct stat stbuf, *st = NULL;
1445 bool erofs = false;
1446 int r = 0;
1447 char *bn;
1448
1449 assert(i);
1450 assert(path);
1451 assert(i->type == TRUNCATE_FILE || (i->type == CREATE_FILE && i->append_or_force));
1452
1453 /* We want to operate on regular file exclusively especially since
1454 * O_TRUNC is unspecified if the file is neither a regular file nor a
1455 * fifo nor a terminal device. Therefore we first open the file and make
1456 * sure it's a regular one before truncating it. */
1457
1458 /* Validate the path and keep the fd on the directory for opening the
1459 * file so we're sure that it can't be changed behind our back. */
1460 dir_fd = path_open_parent_safe(path);
1461 if (dir_fd < 0)
1462 return dir_fd;
1463
1464 bn = basename(path);
1465
1466 RUN_WITH_UMASK(0000) {
1467 mac_selinux_create_file_prepare(path, S_IFREG);
1468 fd = openat(dir_fd, bn, O_CREAT|O_NOFOLLOW|O_NONBLOCK|O_CLOEXEC|O_WRONLY|O_NOCTTY, i->mode);
1469 mac_selinux_create_file_clear();
1470 }
1471
1472 if (fd < 0) {
1473 if (errno != EROFS)
1474 return log_error_errno(errno, "Failed to open/create file %s: %m", path);
1475
1476 /* On a read-only filesystem, we don't want to fail if the
1477 * target is already empty and the perms are set. So we still
1478 * proceed with the sanity checks and let the remaining
1479 * operations fail with EROFS if they try to modify the target
1480 * file. */
1481
1482 fd = openat(dir_fd, bn, O_NOFOLLOW|O_CLOEXEC|O_PATH, i->mode);
1483 if (fd < 0) {
1484 if (errno == ENOENT)
1485 return log_error_errno(SYNTHETIC_ERRNO(EROFS),
1486 "Cannot create file %s on a read-only file system.",
1487 path);
1488
1489 return log_error_errno(errno, "Failed to re-open file %s: %m", path);
1490 }
1491
1492 erofs = true;
1493 }
1494
1495 if (fstat(fd, &stbuf) < 0)
1496 return log_error_errno(errno, "stat(%s) failed: %m", path);
1497
1498 if (!S_ISREG(stbuf.st_mode))
1499 return log_error_errno(SYNTHETIC_ERRNO(EEXIST),
1500 "%s exists and is not a regular file.",
1501 path);
1502
1503 if (stbuf.st_size > 0) {
1504 if (ftruncate(fd, 0) < 0) {
1505 r = erofs ? -EROFS : -errno;
1506 return log_error_errno(r, "Failed to truncate file %s: %m", path);
1507 }
1508 } else
1509 st = &stbuf;
1510
1511 log_debug("\"%s\" has been created.", path);
1512
1513 if (i->argument) {
1514 log_debug("Writing to \"%s\".", path);
1515
1516 r = loop_write(fd, i->argument, strlen(i->argument), false);
1517 if (r < 0) {
1518 r = erofs ? -EROFS : r;
1519 return log_error_errno(r, "Failed to write file %s: %m", path);
1520 }
1521 }
1522
1523 return fd_set_perms(i, fd, path, st);
1524 }
1525
1526 static int copy_files(Item *i) {
1527 _cleanup_close_ int dfd = -1, fd = -1;
1528 char *bn;
1529 int r;
1530
1531 log_debug("Copying tree \"%s\" to \"%s\".", i->argument, i->path);
1532
1533 bn = basename(i->path);
1534
1535 /* Validate the path and use the returned directory fd for copying the
1536 * target so we're sure that the path can't be changed behind our
1537 * back. */
1538 dfd = path_open_parent_safe(i->path);
1539 if (dfd < 0)
1540 return dfd;
1541
1542 r = copy_tree_at(AT_FDCWD, i->argument,
1543 dfd, bn,
1544 i->uid_set ? i->uid : UID_INVALID,
1545 i->gid_set ? i->gid : GID_INVALID,
1546 COPY_REFLINK | COPY_MERGE_EMPTY | COPY_MAC_CREATE | COPY_HARDLINKS);
1547 if (r < 0) {
1548 struct stat a, b;
1549
1550 /* If the target already exists on read-only filesystems, trying
1551 * to create the target will not fail with EEXIST but with
1552 * EROFS. */
1553 if (r == -EROFS && faccessat(dfd, bn, F_OK, AT_SYMLINK_NOFOLLOW) == 0)
1554 r = -EEXIST;
1555
1556 if (r != -EEXIST)
1557 return log_error_errno(r, "Failed to copy files to %s: %m", i->path);
1558
1559 if (stat(i->argument, &a) < 0)
1560 return log_error_errno(errno, "stat(%s) failed: %m", i->argument);
1561
1562 if (fstatat(dfd, bn, &b, AT_SYMLINK_NOFOLLOW) < 0)
1563 return log_error_errno(errno, "stat(%s) failed: %m", i->path);
1564
1565 if ((a.st_mode ^ b.st_mode) & S_IFMT) {
1566 log_debug("Can't copy to %s, file exists already and is of different type", i->path);
1567 return 0;
1568 }
1569 }
1570
1571 fd = openat(dfd, bn, O_NOFOLLOW|O_CLOEXEC|O_PATH);
1572 if (fd < 0)
1573 return log_error_errno(errno, "Failed to openat(%s): %m", i->path);
1574
1575 return fd_set_perms(i, fd, i->path, NULL);
1576 }
1577
1578 typedef enum {
1579 CREATION_NORMAL,
1580 CREATION_EXISTING,
1581 CREATION_FORCE,
1582 _CREATION_MODE_MAX,
1583 _CREATION_MODE_INVALID = -1
1584 } CreationMode;
1585
1586 static const char *const creation_mode_verb_table[_CREATION_MODE_MAX] = {
1587 [CREATION_NORMAL] = "Created",
1588 [CREATION_EXISTING] = "Found existing",
1589 [CREATION_FORCE] = "Created replacement",
1590 };
1591
1592 DEFINE_PRIVATE_STRING_TABLE_LOOKUP_TO_STRING(creation_mode_verb, CreationMode);
1593
1594 static int create_directory_or_subvolume(const char *path, mode_t mode, bool subvol, CreationMode *creation) {
1595 _cleanup_close_ int pfd = -1;
1596 CreationMode c;
1597 int r;
1598
1599 assert(path);
1600
1601 if (!creation)
1602 creation = &c;
1603
1604 pfd = path_open_parent_safe(path);
1605 if (pfd < 0)
1606 return pfd;
1607
1608 if (subvol) {
1609 if (btrfs_is_subvol(empty_to_root(arg_root)) <= 0)
1610
1611 /* Don't create a subvolume unless the root directory is
1612 * one, too. We do this under the assumption that if the
1613 * root directory is just a plain directory (i.e. very
1614 * light-weight), we shouldn't try to split it up into
1615 * subvolumes (i.e. more heavy-weight). Thus, chroot()
1616 * environments and suchlike will get a full brtfs
1617 * subvolume set up below their tree only if they
1618 * specifically set up a btrfs subvolume for the root
1619 * dir too. */
1620
1621 subvol = false;
1622 else {
1623 RUN_WITH_UMASK((~mode) & 0777)
1624 r = btrfs_subvol_make_fd(pfd, basename(path));
1625 }
1626 } else
1627 r = 0;
1628
1629 if (!subvol || r == -ENOTTY)
1630 RUN_WITH_UMASK(0000)
1631 r = mkdirat_label(pfd, basename(path), mode);
1632
1633 if (r < 0) {
1634 int k;
1635
1636 if (!IN_SET(r, -EEXIST, -EROFS))
1637 return log_error_errno(r, "Failed to create directory or subvolume \"%s\": %m", path);
1638
1639 k = is_dir_fd(pfd);
1640 if (k == -ENOENT && r == -EROFS)
1641 return log_error_errno(r, "%s does not exist and cannot be created as the file system is read-only.", path);
1642 if (k < 0)
1643 return log_error_errno(k, "Failed to check if %s exists: %m", path);
1644 if (!k) {
1645 log_warning("\"%s\" already exists and is not a directory.", path);
1646 return -EEXIST;
1647 }
1648
1649 *creation = CREATION_EXISTING;
1650 } else
1651 *creation = CREATION_NORMAL;
1652
1653 log_debug("%s directory \"%s\".", creation_mode_verb_to_string(*creation), path);
1654
1655 r = openat(pfd, basename(path), O_NOCTTY|O_CLOEXEC|O_DIRECTORY);
1656 if (r < 0)
1657 return log_error_errno(errno, "Failed to open directory '%s': %m", basename(path));
1658
1659 return r;
1660 }
1661
1662 static int create_directory(Item *i, const char *path) {
1663 _cleanup_close_ int fd = -1;
1664
1665 assert(i);
1666 assert(IN_SET(i->type, CREATE_DIRECTORY, TRUNCATE_DIRECTORY));
1667
1668 fd = create_directory_or_subvolume(path, i->mode, false, NULL);
1669 if (fd == -EEXIST)
1670 return 0;
1671 if (fd < 0)
1672 return fd;
1673
1674 return fd_set_perms(i, fd, path, NULL);
1675 }
1676
1677 static int create_subvolume(Item *i, const char *path) {
1678 _cleanup_close_ int fd = -1;
1679 CreationMode creation;
1680 int r, q = 0;
1681
1682 assert(i);
1683 assert(IN_SET(i->type, CREATE_SUBVOLUME, CREATE_SUBVOLUME_NEW_QUOTA, CREATE_SUBVOLUME_INHERIT_QUOTA));
1684
1685 fd = create_directory_or_subvolume(path, i->mode, true, &creation);
1686 if (fd == -EEXIST)
1687 return 0;
1688 if (fd < 0)
1689 return fd;
1690
1691 if (creation == CREATION_NORMAL &&
1692 IN_SET(i->type, CREATE_SUBVOLUME_NEW_QUOTA, CREATE_SUBVOLUME_INHERIT_QUOTA)) {
1693 r = btrfs_subvol_auto_qgroup_fd(fd, 0, i->type == CREATE_SUBVOLUME_NEW_QUOTA);
1694 if (r == -ENOTTY)
1695 log_debug_errno(r, "Couldn't adjust quota for subvolume \"%s\" (unsupported fs or dir not a subvolume): %m", i->path);
1696 else if (r == -EROFS)
1697 log_debug_errno(r, "Couldn't adjust quota for subvolume \"%s\" (fs is read-only).", i->path);
1698 else if (r == -ENOTCONN)
1699 log_debug_errno(r, "Couldn't adjust quota for subvolume \"%s\" (quota support is disabled).", i->path);
1700 else if (r < 0)
1701 q = log_error_errno(r, "Failed to adjust quota for subvolume \"%s\": %m", i->path);
1702 else if (r > 0)
1703 log_debug("Adjusted quota for subvolume \"%s\".", i->path);
1704 else if (r == 0)
1705 log_debug("Quota for subvolume \"%s\" already in place, no change made.", i->path);
1706 }
1707
1708 r = fd_set_perms(i, fd, path, NULL);
1709 if (q < 0) /* prefer the quota change error from above */
1710 return q;
1711
1712 return r;
1713 }
1714
1715 static int empty_directory(Item *i, const char *path) {
1716 int r;
1717
1718 assert(i);
1719 assert(i->type == EMPTY_DIRECTORY);
1720
1721 r = is_dir(path, false);
1722 if (r == -ENOENT) {
1723 /* Option "e" operates only on existing objects. Do not
1724 * print errors about non-existent files or directories */
1725 log_debug("Skipping missing directory: %s", path);
1726 return 0;
1727 }
1728 if (r < 0)
1729 return log_error_errno(r, "is_dir() failed on path %s: %m", path);
1730 if (r == 0)
1731 return log_error_errno(SYNTHETIC_ERRNO(EEXIST),
1732 "'%s' already exists and is not a directory.",
1733 path);
1734
1735 return path_set_perms(i, path);
1736 }
1737
1738 static int create_device(Item *i, mode_t file_type) {
1739 _cleanup_close_ int dfd = -1, fd = -1;
1740 CreationMode creation;
1741 char *bn;
1742 int r;
1743
1744 assert(i);
1745 assert(IN_SET(file_type, S_IFBLK, S_IFCHR));
1746
1747 bn = basename(i->path);
1748
1749 /* Validate the path and use the returned directory fd for copying the
1750 * target so we're sure that the path can't be changed behind our
1751 * back. */
1752 dfd = path_open_parent_safe(i->path);
1753 if (dfd < 0)
1754 return dfd;
1755
1756 RUN_WITH_UMASK(0000) {
1757 mac_selinux_create_file_prepare(i->path, file_type);
1758 r = mknodat(dfd, bn, i->mode | file_type, i->major_minor);
1759 mac_selinux_create_file_clear();
1760 }
1761
1762 if (r < 0) {
1763 struct stat st;
1764
1765 if (errno == EPERM) {
1766 log_debug("We lack permissions, possibly because of cgroup configuration; "
1767 "skipping creation of device node %s.", i->path);
1768 return 0;
1769 }
1770
1771 if (errno != EEXIST)
1772 return log_error_errno(errno, "Failed to create device node %s: %m", i->path);
1773
1774 if (fstatat(dfd, bn, &st, 0) < 0)
1775 return log_error_errno(errno, "stat(%s) failed: %m", i->path);
1776
1777 if ((st.st_mode & S_IFMT) != file_type) {
1778
1779 if (i->append_or_force) {
1780
1781 RUN_WITH_UMASK(0000) {
1782 mac_selinux_create_file_prepare(i->path, file_type);
1783 /* FIXME: need to introduce mknodat_atomic() */
1784 r = mknod_atomic(i->path, i->mode | file_type, i->major_minor);
1785 mac_selinux_create_file_clear();
1786 }
1787
1788 if (r < 0)
1789 return log_error_errno(r, "Failed to create device node \"%s\": %m", i->path);
1790 creation = CREATION_FORCE;
1791 } else {
1792 log_debug("%s is not a device node.", i->path);
1793 return 0;
1794 }
1795 } else
1796 creation = CREATION_EXISTING;
1797 } else
1798 creation = CREATION_NORMAL;
1799
1800 log_debug("%s %s device node \"%s\" %u:%u.",
1801 creation_mode_verb_to_string(creation),
1802 i->type == CREATE_BLOCK_DEVICE ? "block" : "char",
1803 i->path, major(i->mode), minor(i->mode));
1804
1805 fd = openat(dfd, bn, O_NOFOLLOW|O_CLOEXEC|O_PATH);
1806 if (fd < 0)
1807 return log_error_errno(errno, "Failed to openat(%s): %m", i->path);
1808
1809 return fd_set_perms(i, fd, i->path, NULL);
1810 }
1811
1812 static int create_fifo(Item *i, const char *path) {
1813 _cleanup_close_ int pfd = -1, fd = -1;
1814 CreationMode creation;
1815 struct stat st;
1816 char *bn;
1817 int r;
1818
1819 pfd = path_open_parent_safe(path);
1820 if (pfd < 0)
1821 return pfd;
1822
1823 bn = basename(path);
1824
1825 RUN_WITH_UMASK(0000) {
1826 mac_selinux_create_file_prepare(path, S_IFIFO);
1827 r = mkfifoat(pfd, bn, i->mode);
1828 mac_selinux_create_file_clear();
1829 }
1830
1831 if (r < 0) {
1832 if (errno != EEXIST)
1833 return log_error_errno(errno, "Failed to create fifo %s: %m", path);
1834
1835 if (fstatat(pfd, bn, &st, AT_SYMLINK_NOFOLLOW) < 0)
1836 return log_error_errno(errno, "stat(%s) failed: %m", path);
1837
1838 if (!S_ISFIFO(st.st_mode)) {
1839
1840 if (i->append_or_force) {
1841 RUN_WITH_UMASK(0000) {
1842 mac_selinux_create_file_prepare(path, S_IFIFO);
1843 r = mkfifoat_atomic(pfd, bn, i->mode);
1844 mac_selinux_create_file_clear();
1845 }
1846
1847 if (r < 0)
1848 return log_error_errno(r, "Failed to create fifo %s: %m", path);
1849 creation = CREATION_FORCE;
1850 } else {
1851 log_warning("\"%s\" already exists and is not a fifo.", path);
1852 return 0;
1853 }
1854 } else
1855 creation = CREATION_EXISTING;
1856 } else
1857 creation = CREATION_NORMAL;
1858
1859 log_debug("%s fifo \"%s\".", creation_mode_verb_to_string(creation), path);
1860
1861 fd = openat(pfd, bn, O_NOFOLLOW|O_CLOEXEC|O_PATH);
1862 if (fd < 0)
1863 return log_error_errno(errno, "Failed to openat(%s): %m", path);
1864
1865 return fd_set_perms(i, fd, i->path, NULL);
1866 }
1867
1868 typedef int (*action_t)(Item *i, const char *path);
1869 typedef int (*fdaction_t)(Item *i, int fd, const char *path, const struct stat *st);
1870
1871 static int item_do(Item *i, int fd, const char *path, fdaction_t action) {
1872 struct stat st;
1873 int r = 0, q;
1874
1875 assert(i);
1876 assert(path);
1877 assert(fd >= 0);
1878
1879 if (fstat(fd, &st) < 0) {
1880 r = log_error_errno(errno, "fstat() on file failed: %m");
1881 goto finish;
1882 }
1883
1884 /* This returns the first error we run into, but nevertheless
1885 * tries to go on */
1886 r = action(i, fd, path, &st);
1887
1888 if (S_ISDIR(st.st_mode)) {
1889 char procfs_path[STRLEN("/proc/self/fd/") + DECIMAL_STR_MAX(int)];
1890 _cleanup_closedir_ DIR *d = NULL;
1891 struct dirent *de;
1892
1893 /* The passed 'fd' was opened with O_PATH. We need to convert
1894 * it into a 'regular' fd before reading the directory content. */
1895 xsprintf(procfs_path, "/proc/self/fd/%i", fd);
1896
1897 d = opendir(procfs_path);
1898 if (!d) {
1899 log_error_errno(errno, "Failed to opendir() '%s': %m", procfs_path);
1900 if (r == 0)
1901 r = -errno;
1902 goto finish;
1903 }
1904
1905 FOREACH_DIRENT_ALL(de, d, q = -errno; goto finish) {
1906 int de_fd;
1907
1908 if (dot_or_dot_dot(de->d_name))
1909 continue;
1910
1911 de_fd = openat(fd, de->d_name, O_NOFOLLOW|O_CLOEXEC|O_PATH);
1912 if (de_fd < 0)
1913 q = log_error_errno(errno, "Failed to open() file '%s': %m", de->d_name);
1914 else {
1915 _cleanup_free_ char *de_path = NULL;
1916
1917 de_path = path_join(path, de->d_name);
1918 if (!de_path)
1919 q = log_oom();
1920 else
1921 /* Pass ownership of dirent fd over */
1922 q = item_do(i, de_fd, de_path, action);
1923 }
1924
1925 if (q < 0 && r == 0)
1926 r = q;
1927 }
1928 }
1929 finish:
1930 safe_close(fd);
1931 return r;
1932 }
1933
1934 static int glob_item(Item *i, action_t action) {
1935 _cleanup_globfree_ glob_t g = {
1936 .gl_opendir = (void *(*)(const char *)) opendir_nomod,
1937 };
1938 int r = 0, k;
1939 char **fn;
1940
1941 k = safe_glob(i->path, GLOB_NOSORT|GLOB_BRACE, &g);
1942 if (k < 0 && k != -ENOENT)
1943 return log_error_errno(k, "glob(%s) failed: %m", i->path);
1944
1945 STRV_FOREACH(fn, g.gl_pathv) {
1946 k = action(i, *fn);
1947 if (k < 0 && r == 0)
1948 r = k;
1949 }
1950
1951 return r;
1952 }
1953
1954 static int glob_item_recursively(Item *i, fdaction_t action) {
1955 _cleanup_globfree_ glob_t g = {
1956 .gl_opendir = (void *(*)(const char *)) opendir_nomod,
1957 };
1958 int r = 0, k;
1959 char **fn;
1960
1961 k = safe_glob(i->path, GLOB_NOSORT|GLOB_BRACE, &g);
1962 if (k < 0 && k != -ENOENT)
1963 return log_error_errno(k, "glob(%s) failed: %m", i->path);
1964
1965 STRV_FOREACH(fn, g.gl_pathv) {
1966 _cleanup_close_ int fd = -1;
1967
1968 /* Make sure we won't trigger/follow file object (such as
1969 * device nodes, automounts, ...) pointed out by 'fn' with
1970 * O_PATH. Note, when O_PATH is used, flags other than
1971 * O_CLOEXEC, O_DIRECTORY, and O_NOFOLLOW are ignored. */
1972
1973 fd = open(*fn, O_CLOEXEC|O_NOFOLLOW|O_PATH);
1974 if (fd < 0) {
1975 log_error_errno(errno, "Opening '%s' failed: %m", *fn);
1976 if (r == 0)
1977 r = -errno;
1978 continue;
1979 }
1980
1981 k = item_do(i, fd, *fn, action);
1982 if (k < 0 && r == 0)
1983 r = k;
1984
1985 /* we passed fd ownership to the previous call */
1986 fd = -1;
1987 }
1988
1989 return r;
1990 }
1991
1992 static int create_item(Item *i) {
1993 CreationMode creation;
1994 int r = 0;
1995
1996 assert(i);
1997
1998 log_debug("Running create action for entry %c %s", (char) i->type, i->path);
1999
2000 switch (i->type) {
2001
2002 case IGNORE_PATH:
2003 case IGNORE_DIRECTORY_PATH:
2004 case REMOVE_PATH:
2005 case RECURSIVE_REMOVE_PATH:
2006 return 0;
2007
2008 case TRUNCATE_FILE:
2009 case CREATE_FILE:
2010 RUN_WITH_UMASK(0000)
2011 (void) mkdir_parents_label(i->path, 0755);
2012
2013 if ((i->type == CREATE_FILE && i->append_or_force) || i->type == TRUNCATE_FILE)
2014 r = truncate_file(i, i->path);
2015 else
2016 r = create_file(i, i->path);
2017
2018 if (r < 0)
2019 return r;
2020 break;
2021
2022 case COPY_FILES:
2023 RUN_WITH_UMASK(0000)
2024 (void) mkdir_parents_label(i->path, 0755);
2025
2026 r = copy_files(i);
2027 if (r < 0)
2028 return r;
2029 break;
2030
2031 case WRITE_FILE:
2032 r = glob_item(i, write_one_file);
2033 if (r < 0)
2034 return r;
2035
2036 break;
2037
2038 case CREATE_DIRECTORY:
2039 case TRUNCATE_DIRECTORY:
2040 RUN_WITH_UMASK(0000)
2041 (void) mkdir_parents_label(i->path, 0755);
2042
2043 r = create_directory(i, i->path);
2044 if (r < 0)
2045 return r;
2046 break;
2047
2048 case CREATE_SUBVOLUME:
2049 case CREATE_SUBVOLUME_INHERIT_QUOTA:
2050 case CREATE_SUBVOLUME_NEW_QUOTA:
2051 RUN_WITH_UMASK(0000)
2052 (void) mkdir_parents_label(i->path, 0755);
2053
2054 r = create_subvolume(i, i->path);
2055 if (r < 0)
2056 return r;
2057 break;
2058
2059 case EMPTY_DIRECTORY:
2060 r = glob_item(i, empty_directory);
2061 if (r < 0)
2062 return r;
2063 break;
2064
2065 case CREATE_FIFO:
2066 RUN_WITH_UMASK(0000)
2067 (void) mkdir_parents_label(i->path, 0755);
2068
2069 r = create_fifo(i, i->path);
2070 if (r < 0)
2071 return r;
2072 break;
2073
2074 case CREATE_SYMLINK: {
2075 RUN_WITH_UMASK(0000)
2076 (void) mkdir_parents_label(i->path, 0755);
2077
2078 mac_selinux_create_file_prepare(i->path, S_IFLNK);
2079 r = symlink(i->argument, i->path);
2080 mac_selinux_create_file_clear();
2081
2082 if (r < 0) {
2083 _cleanup_free_ char *x = NULL;
2084
2085 if (errno != EEXIST)
2086 return log_error_errno(errno, "symlink(%s, %s) failed: %m", i->argument, i->path);
2087
2088 r = readlink_malloc(i->path, &x);
2089 if (r < 0 || !streq(i->argument, x)) {
2090
2091 if (i->append_or_force) {
2092 mac_selinux_create_file_prepare(i->path, S_IFLNK);
2093 r = symlink_atomic(i->argument, i->path);
2094 mac_selinux_create_file_clear();
2095
2096 if (IN_SET(r, -EISDIR, -EEXIST, -ENOTEMPTY)) {
2097 r = rm_rf(i->path, REMOVE_ROOT|REMOVE_PHYSICAL);
2098 if (r < 0)
2099 return log_error_errno(r, "rm -fr %s failed: %m", i->path);
2100
2101 mac_selinux_create_file_prepare(i->path, S_IFLNK);
2102 r = symlink(i->argument, i->path) < 0 ? -errno : 0;
2103 mac_selinux_create_file_clear();
2104 }
2105 if (r < 0)
2106 return log_error_errno(r, "symlink(%s, %s) failed: %m", i->argument, i->path);
2107
2108 creation = CREATION_FORCE;
2109 } else {
2110 log_debug("\"%s\" is not a symlink or does not point to the correct path.", i->path);
2111 return 0;
2112 }
2113 } else
2114 creation = CREATION_EXISTING;
2115 } else
2116
2117 creation = CREATION_NORMAL;
2118 log_debug("%s symlink \"%s\".", creation_mode_verb_to_string(creation), i->path);
2119 break;
2120 }
2121
2122 case CREATE_BLOCK_DEVICE:
2123 case CREATE_CHAR_DEVICE:
2124 if (have_effective_cap(CAP_MKNOD) == 0) {
2125 /* In a container we lack CAP_MKNOD. We shouldn't attempt to create the device node in that
2126 * case to avoid noise, and we don't support virtualized devices in containers anyway. */
2127
2128 log_debug("We lack CAP_MKNOD, skipping creation of device node %s.", i->path);
2129 return 0;
2130 }
2131
2132 RUN_WITH_UMASK(0000)
2133 (void) mkdir_parents_label(i->path, 0755);
2134
2135 r = create_device(i, i->type == CREATE_BLOCK_DEVICE ? S_IFBLK : S_IFCHR);
2136 if (r < 0)
2137 return r;
2138
2139 break;
2140
2141 case ADJUST_MODE:
2142 case RELABEL_PATH:
2143 r = glob_item(i, path_set_perms);
2144 if (r < 0)
2145 return r;
2146 break;
2147
2148 case RECURSIVE_RELABEL_PATH:
2149 r = glob_item_recursively(i, fd_set_perms);
2150 if (r < 0)
2151 return r;
2152 break;
2153
2154 case SET_XATTR:
2155 r = glob_item(i, path_set_xattrs);
2156 if (r < 0)
2157 return r;
2158 break;
2159
2160 case RECURSIVE_SET_XATTR:
2161 r = glob_item_recursively(i, fd_set_xattrs);
2162 if (r < 0)
2163 return r;
2164 break;
2165
2166 case SET_ACL:
2167 r = glob_item(i, path_set_acls);
2168 if (r < 0)
2169 return r;
2170 break;
2171
2172 case RECURSIVE_SET_ACL:
2173 r = glob_item_recursively(i, fd_set_acls);
2174 if (r < 0)
2175 return r;
2176 break;
2177
2178 case SET_ATTRIBUTE:
2179 r = glob_item(i, path_set_attribute);
2180 if (r < 0)
2181 return r;
2182 break;
2183
2184 case RECURSIVE_SET_ATTRIBUTE:
2185 r = glob_item_recursively(i, fd_set_attribute);
2186 if (r < 0)
2187 return r;
2188 break;
2189 }
2190
2191 return 0;
2192 }
2193
2194 static int remove_item_instance(Item *i, const char *instance) {
2195 int r;
2196
2197 assert(i);
2198
2199 switch (i->type) {
2200
2201 case REMOVE_PATH:
2202 if (remove(instance) < 0 && errno != ENOENT)
2203 return log_error_errno(errno, "rm(%s): %m", instance);
2204
2205 break;
2206
2207 case RECURSIVE_REMOVE_PATH:
2208 /* FIXME: we probably should use dir_cleanup() here instead of rm_rf() so that 'x' is honoured. */
2209 log_debug("rm -rf \"%s\"", instance);
2210 r = rm_rf(instance, REMOVE_ROOT|REMOVE_SUBVOLUME|REMOVE_PHYSICAL);
2211 if (r < 0 && r != -ENOENT)
2212 return log_error_errno(r, "rm_rf(%s): %m", instance);
2213
2214 break;
2215
2216 default:
2217 assert_not_reached("wut?");
2218 }
2219
2220 return 0;
2221 }
2222
2223 static int remove_item(Item *i) {
2224 int r;
2225
2226 assert(i);
2227
2228 log_debug("Running remove action for entry %c %s", (char) i->type, i->path);
2229
2230 switch (i->type) {
2231
2232 case TRUNCATE_DIRECTORY:
2233 /* FIXME: we probably should use dir_cleanup() here instead of rm_rf() so that 'x' is honoured. */
2234 log_debug("rm -rf \"%s\"", i->path);
2235 r = rm_rf(i->path, REMOVE_PHYSICAL);
2236 if (r < 0 && r != -ENOENT)
2237 return log_error_errno(r, "rm_rf(%s): %m", i->path);
2238
2239 return 0;
2240
2241 case REMOVE_PATH:
2242 case RECURSIVE_REMOVE_PATH:
2243 return glob_item(i, remove_item_instance);
2244
2245 default:
2246 return 0;
2247 }
2248 }
2249
2250 static int clean_item_instance(Item *i, const char* instance) {
2251 char timestamp[FORMAT_TIMESTAMP_MAX];
2252 _cleanup_closedir_ DIR *d = NULL;
2253 STRUCT_STATX_DEFINE(sx);
2254 int mountpoint, r;
2255 usec_t cutoff, n;
2256
2257 assert(i);
2258
2259 if (!i->age_set)
2260 return 0;
2261
2262 n = now(CLOCK_REALTIME);
2263 if (n < i->age)
2264 return 0;
2265
2266 cutoff = n - i->age;
2267
2268 d = opendir_nomod(instance);
2269 if (!d) {
2270 if (IN_SET(errno, ENOENT, ENOTDIR)) {
2271 log_debug_errno(errno, "Directory \"%s\": %m", instance);
2272 return 0;
2273 }
2274
2275 return log_error_errno(errno, "Failed to open directory %s: %m", instance);
2276 }
2277
2278 r = statx_fallback(dirfd(d), "", AT_EMPTY_PATH, STATX_MODE|STATX_INO|STATX_ATIME|STATX_MTIME, &sx);
2279 if (r < 0)
2280 return log_error_errno(r, "statx(%s) failed: %m", instance);
2281
2282 if (FLAGS_SET(sx.stx_attributes_mask, STATX_ATTR_MOUNT_ROOT))
2283 mountpoint = FLAGS_SET(sx.stx_attributes, STATX_ATTR_MOUNT_ROOT);
2284 else {
2285 struct stat ps;
2286
2287 if (fstatat(dirfd(d), "..", &ps, AT_SYMLINK_NOFOLLOW) != 0)
2288 return log_error_errno(errno, "stat(%s/..) failed: %m", i->path);
2289
2290 mountpoint =
2291 sx.stx_dev_major != major(ps.st_dev) ||
2292 sx.stx_dev_minor != minor(ps.st_dev) ||
2293 sx.stx_ino != ps.st_ino;
2294 }
2295
2296 log_debug("Cleanup threshold for %s \"%s\" is %s",
2297 mountpoint ? "mount point" : "directory",
2298 instance,
2299 format_timestamp_style(timestamp, sizeof(timestamp), cutoff, TIMESTAMP_US));
2300
2301 return dir_cleanup(i, instance, d,
2302 load_statx_timestamp_nsec(&sx.stx_atime),
2303 load_statx_timestamp_nsec(&sx.stx_mtime),
2304 cutoff * NSEC_PER_USEC,
2305 sx.stx_dev_major, sx.stx_dev_minor, mountpoint,
2306 MAX_DEPTH, i->keep_first_level);
2307 }
2308
2309 static int clean_item(Item *i) {
2310 assert(i);
2311
2312 log_debug("Running clean action for entry %c %s", (char) i->type, i->path);
2313
2314 switch (i->type) {
2315 case CREATE_DIRECTORY:
2316 case CREATE_SUBVOLUME:
2317 case CREATE_SUBVOLUME_INHERIT_QUOTA:
2318 case CREATE_SUBVOLUME_NEW_QUOTA:
2319 case TRUNCATE_DIRECTORY:
2320 case IGNORE_PATH:
2321 case COPY_FILES:
2322 clean_item_instance(i, i->path);
2323 return 0;
2324 case EMPTY_DIRECTORY:
2325 case IGNORE_DIRECTORY_PATH:
2326 return glob_item(i, clean_item_instance);
2327 default:
2328 return 0;
2329 }
2330 }
2331
2332 static int process_item(Item *i, OperationMask operation) {
2333 OperationMask todo;
2334 int r, q, p;
2335
2336 assert(i);
2337
2338 todo = operation & ~i->done;
2339 if (todo == 0) /* Everything already done? */
2340 return 0;
2341
2342 i->done |= operation;
2343
2344 r = chase_symlinks(i->path, arg_root, CHASE_NO_AUTOFS|CHASE_WARN, NULL, NULL);
2345 if (r == -EREMOTE) {
2346 log_notice_errno(r, "Skipping %s", i->path);
2347 return 0;
2348 }
2349 if (r < 0)
2350 log_debug_errno(r, "Failed to determine whether '%s' is below autofs, ignoring: %m", i->path);
2351
2352 r = FLAGS_SET(operation, OPERATION_CREATE) ? create_item(i) : 0;
2353 /* Failure can only be tolerated for create */
2354 if (i->allow_failure)
2355 r = 0;
2356
2357 q = FLAGS_SET(operation, OPERATION_REMOVE) ? remove_item(i) : 0;
2358 p = FLAGS_SET(operation, OPERATION_CLEAN) ? clean_item(i) : 0;
2359
2360 return r < 0 ? r :
2361 q < 0 ? q :
2362 p;
2363 }
2364
2365 static int process_item_array(ItemArray *array, OperationMask operation) {
2366 int r = 0;
2367 size_t n;
2368
2369 assert(array);
2370
2371 /* Create any parent first. */
2372 if (FLAGS_SET(operation, OPERATION_CREATE) && array->parent)
2373 r = process_item_array(array->parent, operation & OPERATION_CREATE);
2374
2375 /* Clean up all children first */
2376 if ((operation & (OPERATION_REMOVE|OPERATION_CLEAN)) && !set_isempty(array->children)) {
2377 ItemArray *c;
2378
2379 SET_FOREACH(c, array->children) {
2380 int k;
2381
2382 k = process_item_array(c, operation & (OPERATION_REMOVE|OPERATION_CLEAN));
2383 if (k < 0 && r == 0)
2384 r = k;
2385 }
2386 }
2387
2388 for (n = 0; n < array->n_items; n++) {
2389 int k;
2390
2391 k = process_item(array->items + n, operation);
2392 if (k < 0 && r == 0)
2393 r = k;
2394 }
2395
2396 return r;
2397 }
2398
2399 static void item_free_contents(Item *i) {
2400 assert(i);
2401 free(i->path);
2402 free(i->argument);
2403 strv_free(i->xattrs);
2404
2405 #if HAVE_ACL
2406 acl_free(i->acl_access);
2407 acl_free(i->acl_default);
2408 #endif
2409 }
2410
2411 static ItemArray* item_array_free(ItemArray *a) {
2412 size_t n;
2413
2414 if (!a)
2415 return NULL;
2416
2417 for (n = 0; n < a->n_items; n++)
2418 item_free_contents(a->items + n);
2419
2420 set_free(a->children);
2421 free(a->items);
2422 return mfree(a);
2423 }
2424
2425 static int item_compare(const Item *a, const Item *b) {
2426 /* Make sure that the ownership taking item is put first, so
2427 * that we first create the node, and then can adjust it */
2428
2429 if (takes_ownership(a->type) && !takes_ownership(b->type))
2430 return -1;
2431 if (!takes_ownership(a->type) && takes_ownership(b->type))
2432 return 1;
2433
2434 return CMP(a->type, b->type);
2435 }
2436
2437 static bool item_compatible(Item *a, Item *b) {
2438 assert(a);
2439 assert(b);
2440 assert(streq(a->path, b->path));
2441
2442 if (takes_ownership(a->type) && takes_ownership(b->type))
2443 /* check if the items are the same */
2444 return streq_ptr(a->argument, b->argument) &&
2445
2446 a->uid_set == b->uid_set &&
2447 a->uid == b->uid &&
2448
2449 a->gid_set == b->gid_set &&
2450 a->gid == b->gid &&
2451
2452 a->mode_set == b->mode_set &&
2453 a->mode == b->mode &&
2454
2455 a->age_set == b->age_set &&
2456 a->age == b->age &&
2457
2458 a->mask_perms == b->mask_perms &&
2459
2460 a->keep_first_level == b->keep_first_level &&
2461
2462 a->major_minor == b->major_minor;
2463
2464 return true;
2465 }
2466
2467 static bool should_include_path(const char *path) {
2468 char **prefix;
2469
2470 STRV_FOREACH(prefix, arg_exclude_prefixes)
2471 if (path_startswith(path, *prefix)) {
2472 log_debug("Entry \"%s\" matches exclude prefix \"%s\", skipping.",
2473 path, *prefix);
2474 return false;
2475 }
2476
2477 STRV_FOREACH(prefix, arg_include_prefixes)
2478 if (path_startswith(path, *prefix)) {
2479 log_debug("Entry \"%s\" matches include prefix \"%s\".", path, *prefix);
2480 return true;
2481 }
2482
2483 /* no matches, so we should include this path only if we have no allow list at all */
2484 if (strv_isempty(arg_include_prefixes))
2485 return true;
2486
2487 log_debug("Entry \"%s\" does not match any include prefix, skipping.", path);
2488 return false;
2489 }
2490
2491 static int specifier_expansion_from_arg(Item *i) {
2492 _cleanup_free_ char *unescaped = NULL, *resolved = NULL;
2493 char **xattr;
2494 int r;
2495
2496 assert(i);
2497
2498 if (!i->argument)
2499 return 0;
2500
2501 switch (i->type) {
2502 case COPY_FILES:
2503 case CREATE_SYMLINK:
2504 case CREATE_FILE:
2505 case TRUNCATE_FILE:
2506 case WRITE_FILE:
2507 r = cunescape(i->argument, 0, &unescaped);
2508 if (r < 0)
2509 return log_error_errno(r, "Failed to unescape parameter to write: %s", i->argument);
2510
2511 r = specifier_printf(unescaped, specifier_table, NULL, &resolved);
2512 if (r < 0)
2513 return r;
2514
2515 free_and_replace(i->argument, resolved);
2516 break;
2517
2518 case SET_XATTR:
2519 case RECURSIVE_SET_XATTR:
2520 STRV_FOREACH(xattr, i->xattrs) {
2521 r = specifier_printf(*xattr, specifier_table, NULL, &resolved);
2522 if (r < 0)
2523 return r;
2524
2525 free_and_replace(*xattr, resolved);
2526 }
2527 break;
2528
2529 default:
2530 break;
2531 }
2532 return 0;
2533 }
2534
2535 static int patch_var_run(const char *fname, unsigned line, char **path) {
2536 const char *k;
2537 char *n;
2538
2539 assert(path);
2540 assert(*path);
2541
2542 /* Optionally rewrites lines referencing /var/run/, to use /run/ instead. Why bother? tmpfiles merges lines in
2543 * some cases and detects conflicts in others. If files/directories are specified through two equivalent lines
2544 * this is problematic as neither case will be detected. Ideally we'd detect these cases by resolving symlinks
2545 * early, but that's precisely not what we can do here as this code very likely is running very early on, at a
2546 * time where the paths in question are not available yet, or even more importantly, our own tmpfiles rules
2547 * might create the paths that are intermediary to the listed paths. We can't really cover the generic case,
2548 * but the least we can do is cover the specific case of /var/run vs. /run, as /var/run is a legacy name for
2549 * /run only, and we explicitly document that and require that on systemd systems the former is a symlink to
2550 * the latter. Moreover files below this path are by far the primary usecase for tmpfiles.d/. */
2551
2552 k = path_startswith(*path, "/var/run/");
2553 if (isempty(k)) /* Don't complain about other paths than /var/run, and not about /var/run itself either. */
2554 return 0;
2555
2556 n = path_join("/run", k);
2557 if (!n)
2558 return log_oom();
2559
2560 /* Also log about this briefly. We do so at LOG_NOTICE level, as we fixed up the situation automatically, hence
2561 * there's no immediate need for action by the user. However, in the interest of making things less confusing
2562 * to the user, let's still inform the user that these snippets should really be updated. */
2563 log_syntax(NULL, LOG_NOTICE, fname, line, 0, "Line references path below legacy directory /var/run/, updating %s → %s; please update the tmpfiles.d/ drop-in file accordingly.", *path, n);
2564
2565 free_and_replace(*path, n);
2566
2567 return 0;
2568 }
2569
2570 static int find_uid(const char *user, uid_t *ret_uid, Hashmap **cache) {
2571 int r;
2572
2573 assert(user);
2574 assert(ret_uid);
2575
2576 /* First: parse as numeric UID string */
2577 r = parse_uid(user, ret_uid);
2578 if (r >= 0)
2579 return r;
2580
2581 /* Second: pass to NSS if we are running "online" */
2582 if (!arg_root)
2583 return get_user_creds(&user, ret_uid, NULL, NULL, NULL, 0);
2584
2585 /* Third, synthesize "root" unconditionally */
2586 if (streq(user, "root")) {
2587 *ret_uid = 0;
2588 return 0;
2589 }
2590
2591 /* Fourth: use fgetpwent() to read /etc/passwd directly, if we are "offline" */
2592 return name_to_uid_offline(arg_root, user, ret_uid, cache);
2593 }
2594
2595 static int find_gid(const char *group, gid_t *ret_gid, Hashmap **cache) {
2596 int r;
2597
2598 assert(group);
2599 assert(ret_gid);
2600
2601 /* First: parse as numeric GID string */
2602 r = parse_gid(group, ret_gid);
2603 if (r >= 0)
2604 return r;
2605
2606 /* Second: pass to NSS if we are running "online" */
2607 if (!arg_root)
2608 return get_group_creds(&group, ret_gid, 0);
2609
2610 /* Third, synthesize "root" unconditionally */
2611 if (streq(group, "root")) {
2612 *ret_gid = 0;
2613 return 0;
2614 }
2615
2616 /* Fourth: use fgetgrent() to read /etc/group directly, if we are "offline" */
2617 return name_to_gid_offline(arg_root, group, ret_gid, cache);
2618 }
2619
2620 static int parse_line(
2621 const char *fname,
2622 unsigned line,
2623 const char *buffer,
2624 bool *invalid_config,
2625 Hashmap **uid_cache,
2626 Hashmap **gid_cache) {
2627
2628 _cleanup_free_ char *action = NULL, *mode = NULL, *user = NULL, *group = NULL, *age = NULL, *path = NULL;
2629 _cleanup_(item_free_contents) Item i = {};
2630 ItemArray *existing;
2631 OrderedHashmap *h;
2632 int r, pos;
2633 bool append_or_force = false, boot = false, allow_failure = false;
2634
2635 assert(fname);
2636 assert(line >= 1);
2637 assert(buffer);
2638
2639 r = extract_many_words(
2640 &buffer,
2641 NULL,
2642 EXTRACT_UNQUOTE,
2643 &action,
2644 &path,
2645 &mode,
2646 &user,
2647 &group,
2648 &age,
2649 NULL);
2650 if (r < 0) {
2651 if (IN_SET(r, -EINVAL, -EBADSLT))
2652 /* invalid quoting and such or an unknown specifier */
2653 *invalid_config = true;
2654 return log_syntax(NULL, LOG_ERR, fname, line, r, "Failed to parse line: %m");
2655 } else if (r < 2) {
2656 *invalid_config = true;
2657 return log_syntax(NULL, LOG_ERR, fname, line, SYNTHETIC_ERRNO(EBADMSG), "Syntax error.");
2658 }
2659
2660 if (!empty_or_dash(buffer)) {
2661 i.argument = strdup(buffer);
2662 if (!i.argument)
2663 return log_oom();
2664 }
2665
2666 if (isempty(action)) {
2667 *invalid_config = true;
2668 return log_syntax(NULL, LOG_ERR, fname, line, SYNTHETIC_ERRNO(EBADMSG), "Command too short '%s'.", action);
2669 }
2670
2671 for (pos = 1; action[pos]; pos++) {
2672 if (action[pos] == '!' && !boot)
2673 boot = true;
2674 else if (action[pos] == '+' && !append_or_force)
2675 append_or_force = true;
2676 else if (action[pos] == '-' && !allow_failure)
2677 allow_failure = true;
2678 else {
2679 *invalid_config = true;
2680 return log_syntax(NULL, LOG_ERR, fname, line, SYNTHETIC_ERRNO(EBADMSG), "Unknown modifiers in command '%s'", action);
2681 }
2682 }
2683
2684 if (boot && !arg_boot) {
2685 log_syntax(NULL, LOG_DEBUG, fname, line, 0, "Ignoring entry %s \"%s\" because --boot is not specified.", action, path);
2686 return 0;
2687 }
2688
2689 i.type = action[0];
2690 i.append_or_force = append_or_force;
2691 i.allow_failure = allow_failure;
2692
2693 r = specifier_printf(path, specifier_table, NULL, &i.path);
2694 if (r == -ENXIO)
2695 return log_unresolvable_specifier(fname, line);
2696 if (r < 0) {
2697 if (IN_SET(r, -EINVAL, -EBADSLT))
2698 *invalid_config = true;
2699 return log_syntax(NULL, LOG_ERR, fname, line, r, "Failed to replace specifiers in '%s': %m", path);
2700 }
2701
2702 r = patch_var_run(fname, line, &i.path);
2703 if (r < 0)
2704 return r;
2705
2706 switch (i.type) {
2707
2708 case CREATE_DIRECTORY:
2709 case CREATE_SUBVOLUME:
2710 case CREATE_SUBVOLUME_INHERIT_QUOTA:
2711 case CREATE_SUBVOLUME_NEW_QUOTA:
2712 case EMPTY_DIRECTORY:
2713 case TRUNCATE_DIRECTORY:
2714 case CREATE_FIFO:
2715 case IGNORE_PATH:
2716 case IGNORE_DIRECTORY_PATH:
2717 case REMOVE_PATH:
2718 case RECURSIVE_REMOVE_PATH:
2719 case ADJUST_MODE:
2720 case RELABEL_PATH:
2721 case RECURSIVE_RELABEL_PATH:
2722 if (i.argument)
2723 log_syntax(NULL, LOG_WARNING, fname, line, 0, "%c lines don't take argument fields, ignoring.", i.type);
2724
2725 break;
2726
2727 case CREATE_FILE:
2728 case TRUNCATE_FILE:
2729 break;
2730
2731 case CREATE_SYMLINK:
2732 if (!i.argument) {
2733 i.argument = path_join("/usr/share/factory", i.path);
2734 if (!i.argument)
2735 return log_oom();
2736 }
2737 break;
2738
2739 case WRITE_FILE:
2740 if (!i.argument) {
2741 *invalid_config = true;
2742 return log_syntax(NULL, LOG_ERR, fname, line, SYNTHETIC_ERRNO(EBADMSG), "Write file requires argument.");
2743 }
2744 break;
2745
2746 case COPY_FILES:
2747 if (!i.argument) {
2748 i.argument = path_join("/usr/share/factory", i.path);
2749 if (!i.argument)
2750 return log_oom();
2751
2752 } else if (!path_is_absolute(i.argument)) {
2753 *invalid_config = true;
2754 return log_syntax(NULL, LOG_ERR, fname, line, SYNTHETIC_ERRNO(EBADMSG), "Source path '%s' is not absolute.", i.argument);
2755
2756 }
2757
2758 if (!empty_or_root(arg_root)) {
2759 char *p;
2760
2761 p = path_join(arg_root, i.argument);
2762 if (!p)
2763 return log_oom();
2764 free_and_replace(i.argument, p);
2765 }
2766
2767 path_simplify(i.argument, false);
2768 break;
2769
2770 case CREATE_CHAR_DEVICE:
2771 case CREATE_BLOCK_DEVICE:
2772 if (!i.argument) {
2773 *invalid_config = true;
2774 return log_syntax(NULL, LOG_ERR, fname, line, SYNTHETIC_ERRNO(EBADMSG), "Device file requires argument.");
2775 }
2776
2777 r = parse_dev(i.argument, &i.major_minor);
2778 if (r < 0) {
2779 *invalid_config = true;
2780 return log_syntax(NULL, LOG_ERR, fname, line, r, "Can't parse device file major/minor '%s'.", i.argument);
2781 }
2782
2783 break;
2784
2785 case SET_XATTR:
2786 case RECURSIVE_SET_XATTR:
2787 if (!i.argument) {
2788 *invalid_config = true;
2789 return log_syntax(NULL, LOG_ERR, fname, line, SYNTHETIC_ERRNO(EBADMSG),
2790 "Set extended attribute requires argument.");
2791 }
2792 r = parse_xattrs_from_arg(&i);
2793 if (r < 0)
2794 return r;
2795 break;
2796
2797 case SET_ACL:
2798 case RECURSIVE_SET_ACL:
2799 if (!i.argument) {
2800 *invalid_config = true;
2801 return log_syntax(NULL, LOG_ERR, fname, line, SYNTHETIC_ERRNO(EBADMSG),
2802 "Set ACLs requires argument.");
2803 }
2804 r = parse_acls_from_arg(&i);
2805 if (r < 0)
2806 return r;
2807 break;
2808
2809 case SET_ATTRIBUTE:
2810 case RECURSIVE_SET_ATTRIBUTE:
2811 if (!i.argument) {
2812 *invalid_config = true;
2813 return log_syntax(NULL, LOG_ERR, fname, line, SYNTHETIC_ERRNO(EBADMSG),
2814 "Set file attribute requires argument.");
2815 }
2816 r = parse_attribute_from_arg(&i);
2817 if (IN_SET(r, -EINVAL, -EBADSLT))
2818 *invalid_config = true;
2819 if (r < 0)
2820 return r;
2821 break;
2822
2823 default:
2824 *invalid_config = true;
2825 return log_syntax(NULL, LOG_ERR, fname, line, SYNTHETIC_ERRNO(EBADMSG),
2826 "Unknown command type '%c'.", (char) i.type);
2827 }
2828
2829 if (!path_is_absolute(i.path)) {
2830 *invalid_config = true;
2831 return log_syntax(NULL, LOG_ERR, fname, line, SYNTHETIC_ERRNO(EBADMSG),
2832 "Path '%s' not absolute.", i.path);
2833 }
2834
2835 path_simplify(i.path, false);
2836
2837 if (!should_include_path(i.path))
2838 return 0;
2839
2840 r = specifier_expansion_from_arg(&i);
2841 if (r == -ENXIO)
2842 return log_unresolvable_specifier(fname, line);
2843 if (r < 0) {
2844 if (IN_SET(r, -EINVAL, -EBADSLT))
2845 *invalid_config = true;
2846 return log_syntax(NULL, LOG_ERR, fname, line, r, "Failed to substitute specifiers in argument: %m");
2847 }
2848
2849 if (!empty_or_root(arg_root)) {
2850 char *p;
2851
2852 p = path_join(arg_root, i.path);
2853 if (!p)
2854 return log_oom();
2855 free_and_replace(i.path, p);
2856 }
2857
2858 if (!empty_or_dash(user)) {
2859 r = find_uid(user, &i.uid, uid_cache);
2860 if (r < 0) {
2861 *invalid_config = true;
2862 return log_syntax(NULL, LOG_ERR, fname, line, r, "Failed to resolve user '%s': %m", user);
2863 }
2864
2865 i.uid_set = true;
2866 }
2867
2868 if (!empty_or_dash(group)) {
2869 r = find_gid(group, &i.gid, gid_cache);
2870 if (r < 0) {
2871 *invalid_config = true;
2872 return log_syntax(NULL, LOG_ERR, fname, line, r, "Failed to resolve group '%s'.", group);
2873 }
2874
2875 i.gid_set = true;
2876 }
2877
2878 if (!empty_or_dash(mode)) {
2879 const char *mm = mode;
2880 unsigned m;
2881
2882 if (*mm == '~') {
2883 i.mask_perms = true;
2884 mm++;
2885 }
2886
2887 r = parse_mode(mm, &m);
2888 if (r < 0) {
2889 *invalid_config = true;
2890 return log_syntax(NULL, LOG_ERR, fname, line, r, "Invalid mode '%s'.", mode);
2891 }
2892
2893 i.mode = m;
2894 i.mode_set = true;
2895 } else
2896 i.mode = IN_SET(i.type, CREATE_DIRECTORY, TRUNCATE_DIRECTORY, CREATE_SUBVOLUME, CREATE_SUBVOLUME_INHERIT_QUOTA, CREATE_SUBVOLUME_NEW_QUOTA) ? 0755 : 0644;
2897
2898 if (!empty_or_dash(age)) {
2899 const char *a = age;
2900
2901 if (*a == '~') {
2902 i.keep_first_level = true;
2903 a++;
2904 }
2905
2906 r = parse_sec(a, &i.age);
2907 if (r < 0) {
2908 *invalid_config = true;
2909 return log_syntax(NULL, LOG_ERR, fname, line, r, "Invalid age '%s'.", age);
2910 }
2911
2912 i.age_set = true;
2913 }
2914
2915 h = needs_glob(i.type) ? globs : items;
2916
2917 existing = ordered_hashmap_get(h, i.path);
2918 if (existing) {
2919 size_t n;
2920
2921 for (n = 0; n < existing->n_items; n++) {
2922 if (!item_compatible(existing->items + n, &i) && !i.append_or_force) {
2923 log_syntax(NULL, LOG_NOTICE, fname, line, 0, "Duplicate line for path \"%s\", ignoring.", i.path);
2924 return 0;
2925 }
2926 }
2927 } else {
2928 existing = new0(ItemArray, 1);
2929 if (!existing)
2930 return log_oom();
2931
2932 r = ordered_hashmap_put(h, i.path, existing);
2933 if (r < 0) {
2934 free(existing);
2935 return log_oom();
2936 }
2937 }
2938
2939 if (!GREEDY_REALLOC(existing->items, existing->allocated, existing->n_items + 1))
2940 return log_oom();
2941
2942 existing->items[existing->n_items++] = i;
2943 i = (struct Item) {};
2944
2945 /* Sort item array, to enforce stable ordering of application */
2946 typesafe_qsort(existing->items, existing->n_items, item_compare);
2947
2948 return 0;
2949 }
2950
2951 static int cat_config(char **config_dirs, char **args) {
2952 _cleanup_strv_free_ char **files = NULL;
2953 int r;
2954
2955 r = conf_files_list_with_replacement(arg_root, config_dirs, arg_replace, &files, NULL);
2956 if (r < 0)
2957 return r;
2958
2959 return cat_files(NULL, files, 0);
2960 }
2961
2962 static int exclude_default_prefixes(void) {
2963 int r;
2964
2965 /* Provide an easy way to exclude virtual/memory file systems from what we do here. Useful in
2966 * combination with --root= where we probably don't want to apply stuff to these dirs as they are
2967 * likely over-mounted if the root directory is actually used, and it wouldbe less than ideal to have
2968 * all kinds of files created/adjusted underneath these mount points. */
2969
2970 r = strv_extend_strv(
2971 &arg_exclude_prefixes,
2972 STRV_MAKE("/dev",
2973 "/proc",
2974 "/run",
2975 "/sys"),
2976 true);
2977 if (r < 0)
2978 return log_oom();
2979
2980 return 0;
2981 }
2982
2983 static int help(void) {
2984 _cleanup_free_ char *link = NULL;
2985 int r;
2986
2987 r = terminal_urlify_man("systemd-tmpfiles", "8", &link);
2988 if (r < 0)
2989 return log_oom();
2990
2991 printf("%s [OPTIONS...] [CONFIGURATION FILE...]\n\n"
2992 "Creates, deletes and cleans up volatile and temporary files and directories.\n\n"
2993 " -h --help Show this help\n"
2994 " --user Execute user configuration\n"
2995 " --version Show package version\n"
2996 " --cat-config Show configuration files\n"
2997 " --create Create marked files/directories\n"
2998 " --clean Clean up marked directories\n"
2999 " --remove Remove marked files/directories\n"
3000 " --boot Execute actions only safe at boot\n"
3001 " --prefix=PATH Only apply rules with the specified prefix\n"
3002 " --exclude-prefix=PATH Ignore rules with the specified prefix\n"
3003 " -E Ignore rules prefixed with /dev, /proc, /run, /sys\n"
3004 " --root=PATH Operate on an alternate filesystem root\n"
3005 " --image=PATH Operate on disk image as filesystem root\n"
3006 " --replace=PATH Treat arguments as replacement for PATH\n"
3007 " --no-pager Do not pipe output into a pager\n"
3008 "\nSee the %s for details.\n"
3009 , program_invocation_short_name
3010 , link
3011 );
3012
3013 return 0;
3014 }
3015
3016 static int parse_argv(int argc, char *argv[]) {
3017
3018 enum {
3019 ARG_VERSION = 0x100,
3020 ARG_CAT_CONFIG,
3021 ARG_USER,
3022 ARG_CREATE,
3023 ARG_CLEAN,
3024 ARG_REMOVE,
3025 ARG_BOOT,
3026 ARG_PREFIX,
3027 ARG_EXCLUDE_PREFIX,
3028 ARG_ROOT,
3029 ARG_IMAGE,
3030 ARG_REPLACE,
3031 ARG_NO_PAGER,
3032 };
3033
3034 static const struct option options[] = {
3035 { "help", no_argument, NULL, 'h' },
3036 { "user", no_argument, NULL, ARG_USER },
3037 { "version", no_argument, NULL, ARG_VERSION },
3038 { "cat-config", no_argument, NULL, ARG_CAT_CONFIG },
3039 { "create", no_argument, NULL, ARG_CREATE },
3040 { "clean", no_argument, NULL, ARG_CLEAN },
3041 { "remove", no_argument, NULL, ARG_REMOVE },
3042 { "boot", no_argument, NULL, ARG_BOOT },
3043 { "prefix", required_argument, NULL, ARG_PREFIX },
3044 { "exclude-prefix", required_argument, NULL, ARG_EXCLUDE_PREFIX },
3045 { "root", required_argument, NULL, ARG_ROOT },
3046 { "image", required_argument, NULL, ARG_IMAGE },
3047 { "replace", required_argument, NULL, ARG_REPLACE },
3048 { "no-pager", no_argument, NULL, ARG_NO_PAGER },
3049 {}
3050 };
3051
3052 int c, r;
3053
3054 assert(argc >= 0);
3055 assert(argv);
3056
3057 while ((c = getopt_long(argc, argv, "hE", options, NULL)) >= 0)
3058
3059 switch (c) {
3060
3061 case 'h':
3062 return help();
3063
3064 case ARG_VERSION:
3065 return version();
3066
3067 case ARG_CAT_CONFIG:
3068 arg_cat_config = true;
3069 break;
3070
3071 case ARG_USER:
3072 arg_user = true;
3073 break;
3074
3075 case ARG_CREATE:
3076 arg_operation |= OPERATION_CREATE;
3077 break;
3078
3079 case ARG_CLEAN:
3080 arg_operation |= OPERATION_CLEAN;
3081 break;
3082
3083 case ARG_REMOVE:
3084 arg_operation |= OPERATION_REMOVE;
3085 break;
3086
3087 case ARG_BOOT:
3088 arg_boot = true;
3089 break;
3090
3091 case ARG_PREFIX:
3092 if (strv_push(&arg_include_prefixes, optarg) < 0)
3093 return log_oom();
3094 break;
3095
3096 case ARG_EXCLUDE_PREFIX:
3097 if (strv_push(&arg_exclude_prefixes, optarg) < 0)
3098 return log_oom();
3099 break;
3100
3101 case ARG_ROOT:
3102 r = parse_path_argument_and_warn(optarg, /* suppress_root= */ false, &arg_root);
3103 if (r < 0)
3104 return r;
3105 break;
3106
3107 case ARG_IMAGE:
3108 r = parse_path_argument_and_warn(optarg, /* suppress_root= */ false, &arg_image);
3109 if (r < 0)
3110 return r;
3111
3112 /* Imply -E here since it makes little sense to create files persistently in the /run mointpoint of a disk image */
3113 _fallthrough_;
3114
3115 case 'E':
3116 r = exclude_default_prefixes();
3117 if (r < 0)
3118 return r;
3119
3120 break;
3121
3122 case ARG_REPLACE:
3123 if (!path_is_absolute(optarg) ||
3124 !endswith(optarg, ".conf"))
3125 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
3126 "The argument to --replace= must an absolute path to a config file");
3127
3128 arg_replace = optarg;
3129 break;
3130
3131 case ARG_NO_PAGER:
3132 arg_pager_flags |= PAGER_DISABLE;
3133 break;
3134
3135 case '?':
3136 return -EINVAL;
3137
3138 default:
3139 assert_not_reached("Unhandled option");
3140 }
3141
3142 if (arg_operation == 0 && !arg_cat_config)
3143 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
3144 "You need to specify at least one of --clean, --create or --remove.");
3145
3146 if (arg_replace && arg_cat_config)
3147 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
3148 "Option --replace= is not supported with --cat-config");
3149
3150 if (arg_replace && optind >= argc)
3151 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
3152 "When --replace= is given, some configuration items must be specified");
3153
3154 if (arg_root && arg_user)
3155 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
3156 "Combination of --user and --root= is not supported.");
3157
3158 if (arg_image && arg_root)
3159 return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "Please specify either --root= or --image=, the combination of both is not supported.");
3160
3161 return 1;
3162 }
3163
3164 static int read_config_file(char **config_dirs, const char *fn, bool ignore_enoent, bool *invalid_config) {
3165 _cleanup_(hashmap_freep) Hashmap *uid_cache = NULL, *gid_cache = NULL;
3166 _cleanup_fclose_ FILE *_f = NULL;
3167 unsigned v = 0;
3168 FILE *f;
3169 Item *i;
3170 int r = 0;
3171
3172 assert(fn);
3173
3174 if (streq(fn, "-")) {
3175 log_debug("Reading config from stdin…");
3176 fn = "<stdin>";
3177 f = stdin;
3178 } else {
3179 r = search_and_fopen(fn, "re", arg_root, (const char**) config_dirs, &_f);
3180 if (r < 0) {
3181 if (ignore_enoent && r == -ENOENT) {
3182 log_debug_errno(r, "Failed to open \"%s\", ignoring: %m", fn);
3183 return 0;
3184 }
3185
3186 return log_error_errno(r, "Failed to open '%s': %m", fn);
3187 }
3188 log_debug("Reading config file \"%s\"…", fn);
3189 f = _f;
3190 }
3191
3192 for (;;) {
3193 _cleanup_free_ char *line = NULL;
3194 bool invalid_line = false;
3195 char *l;
3196 int k;
3197
3198 k = read_line(f, LONG_LINE_MAX, &line);
3199 if (k < 0)
3200 return log_error_errno(k, "Failed to read '%s': %m", fn);
3201 if (k == 0)
3202 break;
3203
3204 v++;
3205
3206 l = strstrip(line);
3207 if (IN_SET(*l, 0, '#'))
3208 continue;
3209
3210 k = parse_line(fn, v, l, &invalid_line, &uid_cache, &gid_cache);
3211 if (k < 0) {
3212 if (invalid_line)
3213 /* Allow reporting with a special code if the caller requested this */
3214 *invalid_config = true;
3215 else if (r == 0)
3216 /* The first error becomes our return value */
3217 r = k;
3218 }
3219 }
3220
3221 /* we have to determine age parameter for each entry of type X */
3222 ORDERED_HASHMAP_FOREACH(i, globs) {
3223 Item *j, *candidate_item = NULL;
3224
3225 if (i->type != IGNORE_DIRECTORY_PATH)
3226 continue;
3227
3228 ORDERED_HASHMAP_FOREACH(j, items) {
3229 if (!IN_SET(j->type, CREATE_DIRECTORY, TRUNCATE_DIRECTORY, CREATE_SUBVOLUME, CREATE_SUBVOLUME_INHERIT_QUOTA, CREATE_SUBVOLUME_NEW_QUOTA))
3230 continue;
3231
3232 if (path_equal(j->path, i->path)) {
3233 candidate_item = j;
3234 break;
3235 }
3236
3237 if ((!candidate_item && path_startswith(i->path, j->path)) ||
3238 (candidate_item && path_startswith(j->path, candidate_item->path) && (fnmatch(i->path, j->path, FNM_PATHNAME | FNM_PERIOD) == 0)))
3239 candidate_item = j;
3240 }
3241
3242 if (candidate_item && candidate_item->age_set) {
3243 i->age = candidate_item->age;
3244 i->age_set = true;
3245 }
3246 }
3247
3248 if (ferror(f)) {
3249 log_error_errno(errno, "Failed to read from file %s: %m", fn);
3250 if (r == 0)
3251 r = -EIO;
3252 }
3253
3254 return r;
3255 }
3256
3257 static int parse_arguments(char **config_dirs, char **args, bool *invalid_config) {
3258 char **arg;
3259 int r;
3260
3261 STRV_FOREACH(arg, args) {
3262 r = read_config_file(config_dirs, *arg, false, invalid_config);
3263 if (r < 0)
3264 return r;
3265 }
3266
3267 return 0;
3268 }
3269
3270 static int read_config_files(char **config_dirs, char **args, bool *invalid_config) {
3271 _cleanup_strv_free_ char **files = NULL;
3272 _cleanup_free_ char *p = NULL;
3273 char **f;
3274 int r;
3275
3276 r = conf_files_list_with_replacement(arg_root, config_dirs, arg_replace, &files, &p);
3277 if (r < 0)
3278 return r;
3279
3280 STRV_FOREACH(f, files)
3281 if (p && path_equal(*f, p)) {
3282 log_debug("Parsing arguments at position \"%s\"…", *f);
3283
3284 r = parse_arguments(config_dirs, args, invalid_config);
3285 if (r < 0)
3286 return r;
3287 } else
3288 /* Just warn, ignore result otherwise.
3289 * read_config_file() has some debug output, so no need to print anything. */
3290 (void) read_config_file(config_dirs, *f, true, invalid_config);
3291
3292 return 0;
3293 }
3294
3295 static int link_parent(ItemArray *a) {
3296 const char *path;
3297 char *prefix;
3298 int r;
3299
3300 assert(a);
3301
3302 /* Finds the closest "parent" item array for the specified item array. Then registers the specified item array
3303 * as child of it, and fills the parent in, linking them both ways. This allows us to later create parents
3304 * before their children, and clean up/remove children before their parents. */
3305
3306 if (a->n_items <= 0)
3307 return 0;
3308
3309 path = a->items[0].path;
3310 prefix = newa(char, strlen(path) + 1);
3311 PATH_FOREACH_PREFIX(prefix, path) {
3312 ItemArray *j;
3313
3314 j = ordered_hashmap_get(items, prefix);
3315 if (!j)
3316 j = ordered_hashmap_get(globs, prefix);
3317 if (j) {
3318 r = set_ensure_put(&j->children, NULL, a);
3319 if (r < 0)
3320 return log_oom();
3321
3322 a->parent = j;
3323 return 1;
3324 }
3325 }
3326
3327 return 0;
3328 }
3329
3330 DEFINE_PRIVATE_HASH_OPS_WITH_VALUE_DESTRUCTOR(item_array_hash_ops, char, string_hash_func, string_compare_func,
3331 ItemArray, item_array_free);
3332
3333 static int run(int argc, char *argv[]) {
3334 _cleanup_(loop_device_unrefp) LoopDevice *loop_device = NULL;
3335 _cleanup_(decrypted_image_unrefp) DecryptedImage *decrypted_image = NULL;
3336 _cleanup_(umount_and_rmdir_and_freep) char *unlink_dir = NULL;
3337 _cleanup_strv_free_ char **config_dirs = NULL;
3338 bool invalid_config = false;
3339 ItemArray *a;
3340 enum {
3341 PHASE_REMOVE_AND_CLEAN,
3342 PHASE_CREATE,
3343 _PHASE_MAX
3344 } phase;
3345 int r, k;
3346
3347 r = parse_argv(argc, argv);
3348 if (r <= 0)
3349 return r;
3350
3351 log_setup_service();
3352
3353 /* Descending down file system trees might take a lot of fds */
3354 (void) rlimit_nofile_bump(HIGH_RLIMIT_NOFILE);
3355
3356 if (arg_user) {
3357 r = user_config_paths(&config_dirs);
3358 if (r < 0)
3359 return log_error_errno(r, "Failed to initialize configuration directory list: %m");
3360 } else {
3361 config_dirs = strv_split_nulstr(CONF_PATHS_NULSTR("tmpfiles.d"));
3362 if (!config_dirs)
3363 return log_oom();
3364 }
3365
3366 if (DEBUG_LOGGING) {
3367 _cleanup_free_ char *t = NULL;
3368 char **i;
3369
3370 STRV_FOREACH(i, config_dirs) {
3371 _cleanup_free_ char *j = NULL;
3372
3373 j = path_join(arg_root, *i);
3374 if (!j)
3375 return log_oom();
3376
3377 if (!strextend(&t, "\n\t", j, NULL))
3378 return log_oom();
3379 }
3380
3381 log_debug("Looking for configuration files in (higher priority first):%s", t);
3382 }
3383
3384 if (arg_cat_config) {
3385 (void) pager_open(arg_pager_flags);
3386
3387 return cat_config(config_dirs, argv + optind);
3388 }
3389
3390 umask(0022);
3391
3392 r = mac_selinux_init();
3393 if (r < 0)
3394 return r;
3395
3396 if (arg_image) {
3397 assert(!arg_root);
3398
3399 r = mount_image_privately_interactively(
3400 arg_image,
3401 DISSECT_IMAGE_REQUIRE_ROOT|DISSECT_IMAGE_VALIDATE_OS|DISSECT_IMAGE_RELAX_VAR_CHECK|DISSECT_IMAGE_FSCK,
3402 &unlink_dir,
3403 &loop_device,
3404 &decrypted_image);
3405 if (r < 0)
3406 return r;
3407
3408 arg_root = strdup(unlink_dir);
3409 if (!arg_root)
3410 return log_oom();
3411 }
3412
3413 items = ordered_hashmap_new(&item_array_hash_ops);
3414 globs = ordered_hashmap_new(&item_array_hash_ops);
3415 if (!items || !globs)
3416 return log_oom();
3417
3418 /* If command line arguments are specified along with --replace, read all
3419 * configuration files and insert the positional arguments at the specified
3420 * place. Otherwise, if command line arguments are specified, execute just
3421 * them, and finally, without --replace= or any positional arguments, just
3422 * read configuration and execute it.
3423 */
3424 if (arg_replace || optind >= argc)
3425 r = read_config_files(config_dirs, argv + optind, &invalid_config);
3426 else
3427 r = parse_arguments(config_dirs, argv + optind, &invalid_config);
3428 if (r < 0)
3429 return r;
3430
3431 /* Let's now link up all child/parent relationships */
3432 ORDERED_HASHMAP_FOREACH(a, items) {
3433 r = link_parent(a);
3434 if (r < 0)
3435 return r;
3436 }
3437 ORDERED_HASHMAP_FOREACH(a, globs) {
3438 r = link_parent(a);
3439 if (r < 0)
3440 return r;
3441 }
3442
3443 /* If multiple operations are requested, let's first run the remove/clean operations, and only then the create
3444 * operations. i.e. that we first clean out the platform we then build on. */
3445 for (phase = 0; phase < _PHASE_MAX; phase++) {
3446 OperationMask op;
3447
3448 if (phase == PHASE_REMOVE_AND_CLEAN)
3449 op = arg_operation & (OPERATION_REMOVE|OPERATION_CLEAN);
3450 else if (phase == PHASE_CREATE)
3451 op = arg_operation & OPERATION_CREATE;
3452 else
3453 assert_not_reached("unexpected phase");
3454
3455 if (op == 0) /* Nothing requested in this phase */
3456 continue;
3457
3458 /* The non-globbing ones usually create things, hence we apply them first */
3459 ORDERED_HASHMAP_FOREACH(a, items) {
3460 k = process_item_array(a, op);
3461 if (k < 0 && r >= 0)
3462 r = k;
3463 }
3464
3465 /* The globbing ones usually alter things, hence we apply them second. */
3466 ORDERED_HASHMAP_FOREACH(a, globs) {
3467 k = process_item_array(a, op);
3468 if (k < 0 && r >= 0)
3469 r = k;
3470 }
3471 }
3472
3473 if (ERRNO_IS_RESOURCE(r))
3474 return r;
3475 if (invalid_config)
3476 return EX_DATAERR;
3477 if (r < 0)
3478 return EX_CANTCREAT;
3479 return 0;
3480 }
3481
3482 DEFINE_MAIN_FUNCTION_WITH_POSITIVE_FAILURE(run);
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