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tmpfiles: clarify that we ignore file attribute setting errors
[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 <glob.h>
8 #include <limits.h>
9 #include <linux/fs.h>
10 #include <stdbool.h>
11 #include <stddef.h>
12 #include <stdio.h>
13 #include <stdlib.h>
14 #include <string.h>
15 #include <sys/stat.h>
16 #include <sys/xattr.h>
17 #include <sysexits.h>
18 #include <time.h>
19 #include <unistd.h>
20
21 #include "sd-path.h"
22
23 #include "acl-util.h"
24 #include "alloc-util.h"
25 #include "btrfs-util.h"
26 #include "capability-util.h"
27 #include "chattr-util.h"
28 #include "conf-files.h"
29 #include "copy.h"
30 #include "def.h"
31 #include "dirent-util.h"
32 #include "escape.h"
33 #include "fd-util.h"
34 #include "fileio.h"
35 #include "format-util.h"
36 #include "fs-util.h"
37 #include "glob-util.h"
38 #include "io-util.h"
39 #include "label.h"
40 #include "log.h"
41 #include "macro.h"
42 #include "missing.h"
43 #include "mkdir.h"
44 #include "mount-util.h"
45 #include "pager.h"
46 #include "parse-util.h"
47 #include "path-lookup.h"
48 #include "path-util.h"
49 #include "rm-rf.h"
50 #include "selinux-util.h"
51 #include "set.h"
52 #include "specifier.h"
53 #include "stat-util.h"
54 #include "stdio-util.h"
55 #include "string-table.h"
56 #include "string-util.h"
57 #include "strv.h"
58 #include "terminal-util.h"
59 #include "umask-util.h"
60 #include "user-util.h"
61 #include "util.h"
62
63 /* This reads all files listed in /etc/tmpfiles.d/?*.conf and creates
64 * them in the file system. This is intended to be used to create
65 * properly owned directories beneath /tmp, /var/tmp, /run, which are
66 * volatile and hence need to be recreated on bootup. */
67
68 typedef enum ItemType {
69 /* These ones take file names */
70 CREATE_FILE = 'f',
71 TRUNCATE_FILE = 'F',
72 CREATE_DIRECTORY = 'd',
73 TRUNCATE_DIRECTORY = 'D',
74 CREATE_SUBVOLUME = 'v',
75 CREATE_SUBVOLUME_INHERIT_QUOTA = 'q',
76 CREATE_SUBVOLUME_NEW_QUOTA = 'Q',
77 CREATE_FIFO = 'p',
78 CREATE_SYMLINK = 'L',
79 CREATE_CHAR_DEVICE = 'c',
80 CREATE_BLOCK_DEVICE = 'b',
81 COPY_FILES = 'C',
82
83 /* These ones take globs */
84 WRITE_FILE = 'w',
85 EMPTY_DIRECTORY = 'e',
86 SET_XATTR = 't',
87 RECURSIVE_SET_XATTR = 'T',
88 SET_ACL = 'a',
89 RECURSIVE_SET_ACL = 'A',
90 SET_ATTRIBUTE = 'h',
91 RECURSIVE_SET_ATTRIBUTE = 'H',
92 IGNORE_PATH = 'x',
93 IGNORE_DIRECTORY_PATH = 'X',
94 REMOVE_PATH = 'r',
95 RECURSIVE_REMOVE_PATH = 'R',
96 RELABEL_PATH = 'z',
97 RECURSIVE_RELABEL_PATH = 'Z',
98 ADJUST_MODE = 'm', /* legacy, 'z' is identical to this */
99 } ItemType;
100
101 typedef struct Item {
102 ItemType type;
103
104 char *path;
105 char *argument;
106 char **xattrs;
107 #if HAVE_ACL
108 acl_t acl_access;
109 acl_t acl_default;
110 #endif
111 uid_t uid;
112 gid_t gid;
113 mode_t mode;
114 usec_t age;
115
116 dev_t major_minor;
117 unsigned attribute_value;
118 unsigned attribute_mask;
119
120 bool uid_set:1;
121 bool gid_set:1;
122 bool mode_set:1;
123 bool age_set:1;
124 bool mask_perms:1;
125 bool attribute_set:1;
126
127 bool keep_first_level:1;
128
129 bool force:1;
130
131 bool done:1;
132 } Item;
133
134 typedef struct ItemArray {
135 Item *items;
136 size_t count;
137 size_t size;
138 } ItemArray;
139
140 typedef enum DirectoryType {
141 DIRECTORY_RUNTIME = 0,
142 DIRECTORY_STATE,
143 DIRECTORY_CACHE,
144 DIRECTORY_LOGS,
145 _DIRECTORY_TYPE_MAX,
146 } DirectoryType;
147
148 static bool arg_cat_config = false;
149 static bool arg_user = false;
150 static bool arg_create = false;
151 static bool arg_clean = false;
152 static bool arg_remove = false;
153 static bool arg_boot = false;
154 static bool arg_no_pager = false;
155
156 static char **arg_include_prefixes = NULL;
157 static char **arg_exclude_prefixes = NULL;
158 static char *arg_root = NULL;
159 static char *arg_replace = NULL;
160
161 #define MAX_DEPTH 256
162
163 static OrderedHashmap *items = NULL, *globs = NULL;
164 static Set *unix_sockets = NULL;
165
166 static int specifier_machine_id_safe(char specifier, void *data, void *userdata, char **ret);
167 static int specifier_directory(char specifier, void *data, void *userdata, char **ret);
168
169 static const Specifier specifier_table[] = {
170 { 'm', specifier_machine_id_safe, NULL },
171 { 'b', specifier_boot_id, NULL },
172 { 'H', specifier_host_name, NULL },
173 { 'v', specifier_kernel_release, NULL },
174
175 { 'U', specifier_user_id, NULL },
176 { 'u', specifier_user_name, NULL },
177 { 'h', specifier_user_home, NULL },
178
179 { 't', specifier_directory, UINT_TO_PTR(DIRECTORY_RUNTIME) },
180 { 'S', specifier_directory, UINT_TO_PTR(DIRECTORY_STATE) },
181 { 'C', specifier_directory, UINT_TO_PTR(DIRECTORY_CACHE) },
182 { 'L', specifier_directory, UINT_TO_PTR(DIRECTORY_LOGS) },
183 { 'T', specifier_tmp_dir, NULL },
184 { 'V', specifier_var_tmp_dir, NULL },
185 {}
186 };
187
188 static int specifier_machine_id_safe(char specifier, void *data, void *userdata, char **ret) {
189 int r;
190
191 /* If /etc/machine_id is missing or empty (e.g. in a chroot environment)
192 * return a recognizable error so that the caller can skip the rule
193 * gracefully. */
194
195 r = specifier_machine_id(specifier, data, userdata, ret);
196 if (IN_SET(r, -ENOENT, -ENOMEDIUM))
197 return -ENXIO;
198
199 return r;
200 }
201
202 static int specifier_directory(char specifier, void *data, void *userdata, char **ret) {
203 struct table_entry {
204 uint64_t type;
205 const char *suffix;
206 };
207
208 static const struct table_entry paths_system[] = {
209 [DIRECTORY_RUNTIME] = { SD_PATH_SYSTEM_RUNTIME },
210 [DIRECTORY_STATE] = { SD_PATH_SYSTEM_STATE_PRIVATE },
211 [DIRECTORY_CACHE] = { SD_PATH_SYSTEM_STATE_CACHE },
212 [DIRECTORY_LOGS] = { SD_PATH_SYSTEM_STATE_LOGS },
213 };
214
215 static const struct table_entry paths_user[] = {
216 [DIRECTORY_RUNTIME] = { SD_PATH_USER_RUNTIME },
217 [DIRECTORY_STATE] = { SD_PATH_USER_CONFIGURATION },
218 [DIRECTORY_CACHE] = { SD_PATH_USER_STATE_CACHE },
219 [DIRECTORY_LOGS] = { SD_PATH_USER_CONFIGURATION, "log" },
220 };
221
222 unsigned i;
223 const struct table_entry *paths;
224
225 assert_cc(ELEMENTSOF(paths_system) == ELEMENTSOF(paths_user));
226 paths = arg_user ? paths_user : paths_system;
227
228 i = PTR_TO_UINT(data);
229 assert(i < ELEMENTSOF(paths_system));
230
231 return sd_path_home(paths[i].type, paths[i].suffix, ret);
232 }
233
234 static int log_unresolvable_specifier(const char *filename, unsigned line) {
235 static bool notified = false;
236
237 /* In system mode, this is called when /etc is not fully initialized (e.g.
238 * in a chroot environment) where some specifiers are unresolvable. In user
239 * mode, this is called when some variables are not defined. These cases are
240 * not considered as an error so log at LOG_NOTICE only for the first time
241 * and then downgrade this to LOG_DEBUG for the rest. */
242
243 log_full(notified ? LOG_DEBUG : LOG_NOTICE,
244 "[%s:%u] Failed to resolve specifier: %s, skipping",
245 filename, line,
246 arg_user ? "Required $XDG_... variable not defined" : "uninitialized /etc detected");
247
248 if (!notified)
249 log_notice("All rules containing unresolvable specifiers will be skipped.");
250
251 notified = true;
252 return 0;
253 }
254
255 static int user_config_paths(char*** ret) {
256 _cleanup_strv_free_ char **config_dirs = NULL, **data_dirs = NULL;
257 _cleanup_free_ char *persistent_config = NULL, *runtime_config = NULL, *data_home = NULL;
258 _cleanup_strv_free_ char **res = NULL;
259 int r;
260
261 r = xdg_user_dirs(&config_dirs, &data_dirs);
262 if (r < 0)
263 return r;
264
265 r = xdg_user_config_dir(&persistent_config, "/user-tmpfiles.d");
266 if (r < 0 && r != -ENXIO)
267 return r;
268
269 r = xdg_user_runtime_dir(&runtime_config, "/user-tmpfiles.d");
270 if (r < 0 && r != -ENXIO)
271 return r;
272
273 r = xdg_user_data_dir(&data_home, "/user-tmpfiles.d");
274 if (r < 0 && r != -ENXIO)
275 return r;
276
277 r = strv_extend_strv_concat(&res, config_dirs, "/user-tmpfiles.d");
278 if (r < 0)
279 return r;
280
281 r = strv_extend(&res, persistent_config);
282 if (r < 0)
283 return r;
284
285 r = strv_extend(&res, runtime_config);
286 if (r < 0)
287 return r;
288
289 r = strv_extend(&res, data_home);
290 if (r < 0)
291 return r;
292
293 r = strv_extend_strv_concat(&res, data_dirs, "/user-tmpfiles.d");
294 if (r < 0)
295 return r;
296
297 r = path_strv_make_absolute_cwd(res);
298 if (r < 0)
299 return r;
300
301 *ret = TAKE_PTR(res);
302 return 0;
303 }
304
305 static bool needs_glob(ItemType t) {
306 return IN_SET(t,
307 WRITE_FILE,
308 IGNORE_PATH,
309 IGNORE_DIRECTORY_PATH,
310 REMOVE_PATH,
311 RECURSIVE_REMOVE_PATH,
312 EMPTY_DIRECTORY,
313 ADJUST_MODE,
314 RELABEL_PATH,
315 RECURSIVE_RELABEL_PATH,
316 SET_XATTR,
317 RECURSIVE_SET_XATTR,
318 SET_ACL,
319 RECURSIVE_SET_ACL,
320 SET_ATTRIBUTE,
321 RECURSIVE_SET_ATTRIBUTE);
322 }
323
324 static bool takes_ownership(ItemType t) {
325 return IN_SET(t,
326 CREATE_FILE,
327 TRUNCATE_FILE,
328 CREATE_DIRECTORY,
329 EMPTY_DIRECTORY,
330 TRUNCATE_DIRECTORY,
331 CREATE_SUBVOLUME,
332 CREATE_SUBVOLUME_INHERIT_QUOTA,
333 CREATE_SUBVOLUME_NEW_QUOTA,
334 CREATE_FIFO,
335 CREATE_SYMLINK,
336 CREATE_CHAR_DEVICE,
337 CREATE_BLOCK_DEVICE,
338 COPY_FILES,
339 WRITE_FILE,
340 IGNORE_PATH,
341 IGNORE_DIRECTORY_PATH,
342 REMOVE_PATH,
343 RECURSIVE_REMOVE_PATH);
344 }
345
346 static struct Item* find_glob(OrderedHashmap *h, const char *match) {
347 ItemArray *j;
348 Iterator i;
349
350 ORDERED_HASHMAP_FOREACH(j, h, i) {
351 unsigned n;
352
353 for (n = 0; n < j->count; n++) {
354 Item *item = j->items + n;
355
356 if (fnmatch(item->path, match, FNM_PATHNAME|FNM_PERIOD) == 0)
357 return item;
358 }
359 }
360
361 return NULL;
362 }
363
364 static void load_unix_sockets(void) {
365 _cleanup_fclose_ FILE *f = NULL;
366 int r;
367
368 if (unix_sockets)
369 return;
370
371 /* We maintain a cache of the sockets we found in /proc/net/unix to speed things up a little. */
372
373 unix_sockets = set_new(&path_hash_ops);
374 if (!unix_sockets) {
375 log_oom();
376 return;
377 }
378
379 f = fopen("/proc/net/unix", "re");
380 if (!f) {
381 log_full_errno(errno == ENOENT ? LOG_DEBUG : LOG_WARNING, errno,
382 "Failed to open /proc/net/unix, ignoring: %m");
383 goto fail;
384 }
385
386 /* Skip header */
387 r = read_line(f, LONG_LINE_MAX, NULL);
388 if (r < 0) {
389 log_warning_errno(r, "Failed to skip /proc/net/unix header line: %m");
390 goto fail;
391 }
392 if (r == 0) {
393 log_warning("Premature end of file reading /proc/net/unix.");
394 goto fail;
395 }
396
397 for (;;) {
398 _cleanup_free_ char *line = NULL;
399 char *p, *s;
400
401 r = read_line(f, LONG_LINE_MAX, &line);
402 if (r < 0) {
403 log_warning_errno(r, "Failed to read /proc/net/unix line, ignoring: %m");
404 goto fail;
405 }
406 if (r == 0) /* EOF */
407 break;
408
409 p = strchr(line, ':');
410 if (!p)
411 continue;
412
413 if (strlen(p) < 37)
414 continue;
415
416 p += 37;
417 p += strspn(p, WHITESPACE);
418 p += strcspn(p, WHITESPACE); /* skip one more word */
419 p += strspn(p, WHITESPACE);
420
421 if (*p != '/')
422 continue;
423
424 s = strdup(p);
425 if (!s) {
426 log_oom();
427 goto fail;
428 }
429
430 path_simplify(s, false);
431
432 r = set_consume(unix_sockets, s);
433 if (r < 0 && r != -EEXIST) {
434 log_warning_errno(r, "Failed to add AF_UNIX socket to set, ignoring: %m");
435 goto fail;
436 }
437 }
438
439 return;
440
441 fail:
442 unix_sockets = set_free_free(unix_sockets);
443 }
444
445 static bool unix_socket_alive(const char *fn) {
446 assert(fn);
447
448 load_unix_sockets();
449
450 if (unix_sockets)
451 return !!set_get(unix_sockets, (char*) fn);
452
453 /* We don't know, so assume yes */
454 return true;
455 }
456
457 static int dir_is_mount_point(DIR *d, const char *subdir) {
458
459 int mount_id_parent, mount_id;
460 int r_p, r;
461
462 r_p = name_to_handle_at_loop(dirfd(d), ".", NULL, &mount_id_parent, 0);
463 if (r_p < 0)
464 r_p = -errno;
465
466 r = name_to_handle_at_loop(dirfd(d), subdir, NULL, &mount_id, 0);
467 if (r < 0)
468 r = -errno;
469
470 /* got no handle; make no assumptions, return error */
471 if (r_p < 0 && r < 0)
472 return r_p;
473
474 /* got both handles; if they differ, it is a mount point */
475 if (r_p >= 0 && r >= 0)
476 return mount_id_parent != mount_id;
477
478 /* got only one handle; assume different mount points if one
479 * of both queries was not supported by the filesystem */
480 if (IN_SET(r_p, -ENOSYS, -EOPNOTSUPP) || IN_SET(r, -ENOSYS, -EOPNOTSUPP))
481 return true;
482
483 /* return error */
484 if (r_p < 0)
485 return r_p;
486 return r;
487 }
488
489 static DIR* xopendirat_nomod(int dirfd, const char *path) {
490 DIR *dir;
491
492 dir = xopendirat(dirfd, path, O_NOFOLLOW|O_NOATIME);
493 if (dir)
494 return dir;
495
496 log_debug_errno(errno, "Cannot open %sdirectory \"%s\": %m", dirfd == AT_FDCWD ? "" : "sub", path);
497 if (errno != EPERM)
498 return NULL;
499
500 dir = xopendirat(dirfd, path, O_NOFOLLOW);
501 if (!dir)
502 log_debug_errno(errno, "Cannot open %sdirectory \"%s\": %m", dirfd == AT_FDCWD ? "" : "sub", path);
503
504 return dir;
505 }
506
507 static DIR* opendir_nomod(const char *path) {
508 return xopendirat_nomod(AT_FDCWD, path);
509 }
510
511 static int dir_cleanup(
512 Item *i,
513 const char *p,
514 DIR *d,
515 const struct stat *ds,
516 usec_t cutoff,
517 dev_t rootdev,
518 bool mountpoint,
519 int maxdepth,
520 bool keep_this_level) {
521
522 struct dirent *dent;
523 struct timespec times[2];
524 bool deleted = false;
525 int r = 0;
526
527 FOREACH_DIRENT_ALL(dent, d, break) {
528 struct stat s;
529 usec_t age;
530 _cleanup_free_ char *sub_path = NULL;
531
532 if (dot_or_dot_dot(dent->d_name))
533 continue;
534
535 if (fstatat(dirfd(d), dent->d_name, &s, AT_SYMLINK_NOFOLLOW) < 0) {
536 if (errno == ENOENT)
537 continue;
538
539 /* FUSE, NFS mounts, SELinux might return EACCES */
540 r = log_full_errno(errno == EACCES ? LOG_DEBUG : LOG_ERR, errno,
541 "stat(%s/%s) failed: %m", p, dent->d_name);
542 continue;
543 }
544
545 /* Stay on the same filesystem */
546 if (s.st_dev != rootdev) {
547 log_debug("Ignoring \"%s/%s\": different filesystem.", p, dent->d_name);
548 continue;
549 }
550
551 /* Try to detect bind mounts of the same filesystem instance; they
552 * do not differ in device major/minors. This type of query is not
553 * supported on all kernels or filesystem types though. */
554 if (S_ISDIR(s.st_mode) && dir_is_mount_point(d, dent->d_name) > 0) {
555 log_debug("Ignoring \"%s/%s\": different mount of the same filesystem.",
556 p, dent->d_name);
557 continue;
558 }
559
560 sub_path = strjoin(p, "/", dent->d_name);
561 if (!sub_path) {
562 r = log_oom();
563 goto finish;
564 }
565
566 /* Is there an item configured for this path? */
567 if (ordered_hashmap_get(items, sub_path)) {
568 log_debug("Ignoring \"%s\": a separate entry exists.", sub_path);
569 continue;
570 }
571
572 if (find_glob(globs, sub_path)) {
573 log_debug("Ignoring \"%s\": a separate glob exists.", sub_path);
574 continue;
575 }
576
577 if (S_ISDIR(s.st_mode)) {
578
579 if (mountpoint &&
580 streq(dent->d_name, "lost+found") &&
581 s.st_uid == 0) {
582 log_debug("Ignoring \"%s\".", sub_path);
583 continue;
584 }
585
586 if (maxdepth <= 0)
587 log_warning("Reached max depth on \"%s\".", sub_path);
588 else {
589 _cleanup_closedir_ DIR *sub_dir;
590 int q;
591
592 sub_dir = xopendirat_nomod(dirfd(d), dent->d_name);
593 if (!sub_dir) {
594 if (errno != ENOENT)
595 r = log_error_errno(errno, "opendir(%s) failed: %m", sub_path);
596
597 continue;
598 }
599
600 q = dir_cleanup(i, sub_path, sub_dir, &s, cutoff, rootdev, false, maxdepth-1, false);
601 if (q < 0)
602 r = q;
603 }
604
605 /* Note: if you are wondering why we don't
606 * support the sticky bit for excluding
607 * directories from cleaning like we do it for
608 * other file system objects: well, the sticky
609 * bit already has a meaning for directories,
610 * so we don't want to overload that. */
611
612 if (keep_this_level) {
613 log_debug("Keeping \"%s\".", sub_path);
614 continue;
615 }
616
617 /* Ignore ctime, we change it when deleting */
618 age = timespec_load(&s.st_mtim);
619 if (age >= cutoff) {
620 char a[FORMAT_TIMESTAMP_MAX];
621 /* Follows spelling in stat(1). */
622 log_debug("Directory \"%s\": modify time %s is too new.",
623 sub_path,
624 format_timestamp_us(a, sizeof(a), age));
625 continue;
626 }
627
628 age = timespec_load(&s.st_atim);
629 if (age >= cutoff) {
630 char a[FORMAT_TIMESTAMP_MAX];
631 log_debug("Directory \"%s\": access time %s is too new.",
632 sub_path,
633 format_timestamp_us(a, sizeof(a), age));
634 continue;
635 }
636
637 log_debug("Removing directory \"%s\".", sub_path);
638 if (unlinkat(dirfd(d), dent->d_name, AT_REMOVEDIR) < 0)
639 if (!IN_SET(errno, ENOENT, ENOTEMPTY))
640 r = log_error_errno(errno, "rmdir(%s): %m", sub_path);
641
642 } else {
643 /* Skip files for which the sticky bit is
644 * set. These are semantics we define, and are
645 * unknown elsewhere. See XDG_RUNTIME_DIR
646 * specification for details. */
647 if (s.st_mode & S_ISVTX) {
648 log_debug("Skipping \"%s\": sticky bit set.", sub_path);
649 continue;
650 }
651
652 if (mountpoint && S_ISREG(s.st_mode))
653 if (s.st_uid == 0 && STR_IN_SET(dent->d_name,
654 ".journal",
655 "aquota.user",
656 "aquota.group")) {
657 log_debug("Skipping \"%s\".", sub_path);
658 continue;
659 }
660
661 /* Ignore sockets that are listed in /proc/net/unix */
662 if (S_ISSOCK(s.st_mode) && unix_socket_alive(sub_path)) {
663 log_debug("Skipping \"%s\": live socket.", sub_path);
664 continue;
665 }
666
667 /* Ignore device nodes */
668 if (S_ISCHR(s.st_mode) || S_ISBLK(s.st_mode)) {
669 log_debug("Skipping \"%s\": a device.", sub_path);
670 continue;
671 }
672
673 /* Keep files on this level around if this is
674 * requested */
675 if (keep_this_level) {
676 log_debug("Keeping \"%s\".", sub_path);
677 continue;
678 }
679
680 age = timespec_load(&s.st_mtim);
681 if (age >= cutoff) {
682 char a[FORMAT_TIMESTAMP_MAX];
683 /* Follows spelling in stat(1). */
684 log_debug("File \"%s\": modify time %s is too new.",
685 sub_path,
686 format_timestamp_us(a, sizeof(a), age));
687 continue;
688 }
689
690 age = timespec_load(&s.st_atim);
691 if (age >= cutoff) {
692 char a[FORMAT_TIMESTAMP_MAX];
693 log_debug("File \"%s\": access time %s is too new.",
694 sub_path,
695 format_timestamp_us(a, sizeof(a), age));
696 continue;
697 }
698
699 age = timespec_load(&s.st_ctim);
700 if (age >= cutoff) {
701 char a[FORMAT_TIMESTAMP_MAX];
702 log_debug("File \"%s\": change time %s is too new.",
703 sub_path,
704 format_timestamp_us(a, sizeof(a), age));
705 continue;
706 }
707
708 log_debug("unlink \"%s\"", sub_path);
709
710 if (unlinkat(dirfd(d), dent->d_name, 0) < 0)
711 if (errno != ENOENT)
712 r = log_error_errno(errno, "unlink(%s): %m", sub_path);
713
714 deleted = true;
715 }
716 }
717
718 finish:
719 if (deleted) {
720 usec_t age1, age2;
721 char a[FORMAT_TIMESTAMP_MAX], b[FORMAT_TIMESTAMP_MAX];
722
723 /* Restore original directory timestamps */
724 times[0] = ds->st_atim;
725 times[1] = ds->st_mtim;
726
727 age1 = timespec_load(&ds->st_atim);
728 age2 = timespec_load(&ds->st_mtim);
729 log_debug("Restoring access and modification time on \"%s\": %s, %s",
730 p,
731 format_timestamp_us(a, sizeof(a), age1),
732 format_timestamp_us(b, sizeof(b), age2));
733 if (futimens(dirfd(d), times) < 0)
734 log_error_errno(errno, "utimensat(%s): %m", p);
735 }
736
737 return r;
738 }
739
740 static bool dangerous_hardlinks(void) {
741 _cleanup_free_ char *value = NULL;
742 static int cached = -1;
743 int r;
744
745 /* Check whether the fs.protected_hardlinks sysctl is on. If we can't determine it we assume its off, as that's
746 * what the upstream default is. */
747
748 if (cached >= 0)
749 return cached;
750
751 r = read_one_line_file("/proc/sys/fs/protected_hardlinks", &value);
752 if (r < 0) {
753 log_debug_errno(r, "Failed to read fs.protected_hardlinks sysctl: %m");
754 return true;
755 }
756
757 r = parse_boolean(value);
758 if (r < 0) {
759 log_debug_errno(r, "Failed to parse fs.protected_hardlinks sysctl: %m");
760 return true;
761 }
762
763 cached = r == 0;
764 return cached;
765 }
766
767 static bool hardlink_vulnerable(const struct stat *st) {
768 assert(st);
769
770 return !S_ISDIR(st->st_mode) && st->st_nlink > 1 && dangerous_hardlinks();
771 }
772
773 static int fd_set_perms(Item *i, int fd, const char *path, const struct stat *st) {
774 _cleanup_free_ char *buffer = NULL;
775 struct stat stbuf;
776 int r;
777
778 assert(i);
779 assert(fd);
780
781 if (!path) {
782 r = fd_get_path(fd, &buffer);
783 if (r < 0)
784 return log_error_errno(r, "Failed to get path: %m");
785
786 path = buffer;
787 }
788
789 if (!i->mode_set && !i->uid_set && !i->gid_set)
790 goto shortcut;
791
792 if (!st) {
793 if (fstat(fd, &stbuf) < 0)
794 return log_error_errno(errno, "fstat(%s) failed: %m", path);
795 st = &stbuf;
796 }
797
798 if (hardlink_vulnerable(st)) {
799 log_error("Refusing to set permissions on hardlinked file %s while the fs.protected_hardlinks sysctl is turned off.", path);
800 return -EPERM;
801 }
802
803 if (i->mode_set) {
804 if (S_ISLNK(st->st_mode))
805 log_debug("Skipping mode fix for symlink %s.", path);
806 else {
807 mode_t m = i->mode;
808
809 if (i->mask_perms) {
810 if (!(st->st_mode & 0111))
811 m &= ~0111;
812 if (!(st->st_mode & 0222))
813 m &= ~0222;
814 if (!(st->st_mode & 0444))
815 m &= ~0444;
816 if (!S_ISDIR(st->st_mode))
817 m &= ~07000; /* remove sticky/sgid/suid bit, unless directory */
818 }
819
820 if (m == (st->st_mode & 07777))
821 log_debug("\"%s\" has correct mode %o already.", path, st->st_mode);
822 else {
823 log_debug("Changing \"%s\" to mode %o.", path, m);
824 if (fchmod_opath(fd, m) < 0)
825 return log_error_errno(errno, "fchmod() of %s failed: %m", path);
826 }
827 }
828 }
829
830 if ((i->uid_set && i->uid != st->st_uid) ||
831 (i->gid_set && i->gid != st->st_gid)) {
832 log_debug("Changing \"%s\" to owner "UID_FMT":"GID_FMT,
833 path,
834 i->uid_set ? i->uid : UID_INVALID,
835 i->gid_set ? i->gid : GID_INVALID);
836
837 if (fchownat(fd,
838 "",
839 i->uid_set ? i->uid : UID_INVALID,
840 i->gid_set ? i->gid : GID_INVALID,
841 AT_EMPTY_PATH) < 0)
842 return log_error_errno(errno, "fchownat() of %s failed: %m", path);
843 }
844
845 shortcut:
846 return label_fix(path, 0);
847 }
848
849 static int path_open_parent_safe(const char *path) {
850 _cleanup_free_ char *dn = NULL;
851 int fd;
852
853 if (path_equal(path, "/") || !path_is_normalized(path)) {
854 log_error("Failed to open parent of '%s': invalid path.", path);
855 return -EINVAL;
856 }
857
858 dn = dirname_malloc(path);
859 if (!dn)
860 return log_oom();
861
862 fd = chase_symlinks(dn, NULL, CHASE_OPEN|CHASE_SAFE, NULL);
863 if (fd == -EPERM)
864 return log_error_errno(fd, "Unsafe symlinks encountered in %s, refusing.", path);
865 if (fd < 0)
866 return log_error_errno(fd, "Failed to validate path %s: %m", path);
867
868 return fd;
869 }
870
871 static int path_open_safe(const char *path) {
872 int fd;
873
874 /* path_open_safe() returns a file descriptor opened with O_PATH after
875 * verifying that the path doesn't contain unsafe transitions, except
876 * for its final component as the function does not follow symlink. */
877
878 assert(path);
879
880 if (!path_is_normalized(path)) {
881 log_error("Failed to open invalid path '%s'.", path);
882 return -EINVAL;
883 }
884
885 fd = chase_symlinks(path, NULL, CHASE_OPEN|CHASE_SAFE|CHASE_NOFOLLOW, NULL);
886 if (fd == -EPERM)
887 return log_error_errno(fd, "Unsafe symlinks encountered in %s, refusing.", path);
888 if (fd < 0)
889 return log_error_errno(fd, "Failed to validate path %s: %m", path);
890
891 return fd;
892 }
893
894 static int path_set_perms(Item *i, const char *path) {
895 _cleanup_close_ int fd = -1;
896
897 assert(i);
898 assert(path);
899
900 fd = path_open_safe(path);
901 if (fd < 0)
902 return fd;
903
904 return fd_set_perms(i, fd, path, NULL);
905 }
906
907 static int parse_xattrs_from_arg(Item *i) {
908 const char *p;
909 int r;
910
911 assert(i);
912 assert(i->argument);
913
914 p = i->argument;
915
916 for (;;) {
917 _cleanup_free_ char *name = NULL, *value = NULL, *xattr = NULL;
918
919 r = extract_first_word(&p, &xattr, NULL, EXTRACT_QUOTES|EXTRACT_CUNESCAPE);
920 if (r < 0)
921 log_warning_errno(r, "Failed to parse extended attribute '%s', ignoring: %m", p);
922 if (r <= 0)
923 break;
924
925 r = split_pair(xattr, "=", &name, &value);
926 if (r < 0) {
927 log_warning_errno(r, "Failed to parse extended attribute, ignoring: %s", xattr);
928 continue;
929 }
930
931 if (isempty(name) || isempty(value)) {
932 log_warning("Malformed extended attribute found, ignoring: %s", xattr);
933 continue;
934 }
935
936 if (strv_push_pair(&i->xattrs, name, value) < 0)
937 return log_oom();
938
939 name = value = NULL;
940 }
941
942 return 0;
943 }
944
945 static int fd_set_xattrs(Item *i, int fd, const char *path, const struct stat *st) {
946 char procfs_path[STRLEN("/proc/self/fd/") + DECIMAL_STR_MAX(int)];
947 _cleanup_free_ char *buffer = NULL;
948 char **name, **value;
949 int r;
950
951 assert(i);
952 assert(fd);
953
954 if (!path) {
955 r = fd_get_path(fd, &buffer);
956 if (r < 0)
957 return log_error_errno(r, "Failed to get path: %m");
958
959 path = buffer;
960 }
961
962 xsprintf(procfs_path, "/proc/self/fd/%i", fd);
963
964 STRV_FOREACH_PAIR(name, value, i->xattrs) {
965 log_debug("Setting extended attribute '%s=%s' on %s.", *name, *value, path);
966 if (setxattr(procfs_path, *name, *value, strlen(*value), 0) < 0)
967 return log_error_errno(errno, "Setting extended attribute %s=%s on %s failed: %m",
968 *name, *value, path);
969 }
970 return 0;
971 }
972
973 static int path_set_xattrs(Item *i, const char *path) {
974 _cleanup_close_ int fd = -1;
975
976 assert(i);
977 assert(path);
978
979 fd = path_open_safe(path);
980 if (fd < 0)
981 return fd;
982
983 return fd_set_xattrs(i, fd, path, NULL);
984 }
985
986 static int parse_acls_from_arg(Item *item) {
987 #if HAVE_ACL
988 int r;
989
990 assert(item);
991
992 /* If force (= modify) is set, we will not modify the acl
993 * afterwards, so the mask can be added now if necessary. */
994
995 r = parse_acl(item->argument, &item->acl_access, &item->acl_default, !item->force);
996 if (r < 0)
997 log_warning_errno(r, "Failed to parse ACL \"%s\": %m. Ignoring", item->argument);
998 #else
999 log_warning_errno(ENOSYS, "ACLs are not supported. Ignoring");
1000 #endif
1001
1002 return 0;
1003 }
1004
1005 #if HAVE_ACL
1006 static int path_set_acl(const char *path, const char *pretty, acl_type_t type, acl_t acl, bool modify) {
1007 _cleanup_(acl_free_charpp) char *t = NULL;
1008 _cleanup_(acl_freep) acl_t dup = NULL;
1009 int r;
1010
1011 /* Returns 0 for success, positive error if already warned,
1012 * negative error otherwise. */
1013
1014 if (modify) {
1015 r = acls_for_file(path, type, acl, &dup);
1016 if (r < 0)
1017 return r;
1018
1019 r = calc_acl_mask_if_needed(&dup);
1020 if (r < 0)
1021 return r;
1022 } else {
1023 dup = acl_dup(acl);
1024 if (!dup)
1025 return -errno;
1026
1027 /* the mask was already added earlier if needed */
1028 }
1029
1030 r = add_base_acls_if_needed(&dup, path);
1031 if (r < 0)
1032 return r;
1033
1034 t = acl_to_any_text(dup, NULL, ',', TEXT_ABBREVIATE);
1035 log_debug("Setting %s ACL %s on %s.",
1036 type == ACL_TYPE_ACCESS ? "access" : "default",
1037 strna(t), pretty);
1038
1039 r = acl_set_file(path, type, dup);
1040 if (r < 0)
1041 /* Return positive to indicate we already warned */
1042 return -log_error_errno(errno,
1043 "Setting %s ACL \"%s\" on %s failed: %m",
1044 type == ACL_TYPE_ACCESS ? "access" : "default",
1045 strna(t), pretty);
1046
1047 return 0;
1048 }
1049 #endif
1050
1051 static int fd_set_acls(Item *item, int fd, const char *path, const struct stat *st) {
1052 int r = 0;
1053 #if HAVE_ACL
1054 char procfs_path[STRLEN("/proc/self/fd/") + DECIMAL_STR_MAX(int)];
1055 _cleanup_free_ char *buffer = NULL;
1056 struct stat stbuf;
1057
1058 assert(item);
1059 assert(fd);
1060
1061 if (!path) {
1062 r = fd_get_path(fd, &buffer);
1063 if (r < 0)
1064 return log_error_errno(r, "Failed to get path: %m");
1065
1066 path = buffer;
1067 }
1068
1069 if (!st) {
1070 if (fstat(fd, &stbuf) < 0)
1071 return log_error_errno(errno, "fstat(%s) failed: %m", path);
1072 st = &stbuf;
1073 }
1074
1075 if (hardlink_vulnerable(st)) {
1076 log_error("Refusing to set ACLs on hardlinked file %s while the fs.protected_hardlinks sysctl is turned off.", path);
1077 return -EPERM;
1078 }
1079
1080 if (S_ISLNK(st->st_mode)) {
1081 log_debug("Skipping ACL fix for symlink %s.", path);
1082 return 0;
1083 }
1084
1085 xsprintf(procfs_path, "/proc/self/fd/%i", fd);
1086
1087 if (item->acl_access)
1088 r = path_set_acl(procfs_path, path, ACL_TYPE_ACCESS, item->acl_access, item->force);
1089
1090 /* set only default acls to folders */
1091 if (r == 0 && item->acl_default && S_ISDIR(st->st_mode))
1092 r = path_set_acl(procfs_path, path, ACL_TYPE_DEFAULT, item->acl_default, item->force);
1093
1094 if (r > 0)
1095 return -r; /* already warned */
1096 if (r == -EOPNOTSUPP) {
1097 log_debug_errno(r, "ACLs not supported by file system at %s", path);
1098 return 0;
1099 }
1100 if (r < 0)
1101 return log_error_errno(r, "ACL operation on \"%s\" failed: %m", path);
1102 #endif
1103 return r;
1104 }
1105
1106 static int path_set_acls(Item *item, const char *path) {
1107 int r = 0;
1108 #if HAVE_ACL
1109 _cleanup_close_ int fd = -1;
1110
1111 assert(item);
1112 assert(path);
1113
1114 fd = path_open_safe(path);
1115 if (fd < 0)
1116 return fd;
1117
1118 r = fd_set_acls(item, fd, path, NULL);
1119 #endif
1120 return r;
1121 }
1122
1123 #define ATTRIBUTES_ALL \
1124 (FS_NOATIME_FL | \
1125 FS_SYNC_FL | \
1126 FS_DIRSYNC_FL | \
1127 FS_APPEND_FL | \
1128 FS_COMPR_FL | \
1129 FS_NODUMP_FL | \
1130 FS_EXTENT_FL | \
1131 FS_IMMUTABLE_FL | \
1132 FS_JOURNAL_DATA_FL | \
1133 FS_SECRM_FL | \
1134 FS_UNRM_FL | \
1135 FS_NOTAIL_FL | \
1136 FS_TOPDIR_FL | \
1137 FS_NOCOW_FL)
1138
1139 static int parse_attribute_from_arg(Item *item) {
1140
1141 static const struct {
1142 char character;
1143 unsigned value;
1144 } attributes[] = {
1145 { 'A', FS_NOATIME_FL }, /* do not update atime */
1146 { 'S', FS_SYNC_FL }, /* Synchronous updates */
1147 { 'D', FS_DIRSYNC_FL }, /* dirsync behaviour (directories only) */
1148 { 'a', FS_APPEND_FL }, /* writes to file may only append */
1149 { 'c', FS_COMPR_FL }, /* Compress file */
1150 { 'd', FS_NODUMP_FL }, /* do not dump file */
1151 { 'e', FS_EXTENT_FL }, /* Extents */
1152 { 'i', FS_IMMUTABLE_FL }, /* Immutable file */
1153 { 'j', FS_JOURNAL_DATA_FL }, /* Reserved for ext3 */
1154 { 's', FS_SECRM_FL }, /* Secure deletion */
1155 { 'u', FS_UNRM_FL }, /* Undelete */
1156 { 't', FS_NOTAIL_FL }, /* file tail should not be merged */
1157 { 'T', FS_TOPDIR_FL }, /* Top of directory hierarchies */
1158 { 'C', FS_NOCOW_FL }, /* Do not cow file */
1159 };
1160
1161 enum {
1162 MODE_ADD,
1163 MODE_DEL,
1164 MODE_SET
1165 } mode = MODE_ADD;
1166
1167 unsigned value = 0, mask = 0;
1168 const char *p;
1169
1170 assert(item);
1171
1172 p = item->argument;
1173 if (p) {
1174 if (*p == '+') {
1175 mode = MODE_ADD;
1176 p++;
1177 } else if (*p == '-') {
1178 mode = MODE_DEL;
1179 p++;
1180 } else if (*p == '=') {
1181 mode = MODE_SET;
1182 p++;
1183 }
1184 }
1185
1186 if (isempty(p) && mode != MODE_SET) {
1187 log_error("Setting file attribute on '%s' needs an attribute specification.", item->path);
1188 return -EINVAL;
1189 }
1190
1191 for (; p && *p ; p++) {
1192 unsigned i, v;
1193
1194 for (i = 0; i < ELEMENTSOF(attributes); i++)
1195 if (*p == attributes[i].character)
1196 break;
1197
1198 if (i >= ELEMENTSOF(attributes)) {
1199 log_error("Unknown file attribute '%c' on '%s'.", *p, item->path);
1200 return -EINVAL;
1201 }
1202
1203 v = attributes[i].value;
1204
1205 SET_FLAG(value, v, IN_SET(mode, MODE_ADD, MODE_SET));
1206
1207 mask |= v;
1208 }
1209
1210 if (mode == MODE_SET)
1211 mask |= ATTRIBUTES_ALL;
1212
1213 assert(mask != 0);
1214
1215 item->attribute_mask = mask;
1216 item->attribute_value = value;
1217 item->attribute_set = true;
1218
1219 return 0;
1220 }
1221
1222 static int fd_set_attribute(Item *item, int fd, const char *path, const struct stat *st) {
1223 _cleanup_close_ int procfs_fd = -1;
1224 _cleanup_free_ char *buffer = NULL;
1225 struct stat stbuf;
1226 unsigned f;
1227 int r;
1228
1229 if (!item->attribute_set || item->attribute_mask == 0)
1230 return 0;
1231
1232 if (!path) {
1233 r = fd_get_path(fd, &buffer);
1234 if (r < 0)
1235 return log_error_errno(r, "Failed to get path: %m");
1236
1237 path = buffer;
1238 }
1239
1240 if (!st) {
1241 if (fstat(fd, &stbuf) < 0)
1242 return log_error_errno(errno, "fstat(%s) failed: %m", path);
1243 st = &stbuf;
1244 }
1245
1246 /* Issuing the file attribute ioctls on device nodes is not
1247 * safe, as that will be delivered to the drivers, not the
1248 * file system containing the device node. */
1249 if (!S_ISREG(st->st_mode) && !S_ISDIR(st->st_mode)) {
1250 log_error("Setting file flags is only supported on regular files and directories, cannot set on '%s'.", path);
1251 return -EINVAL;
1252 }
1253
1254 f = item->attribute_value & item->attribute_mask;
1255
1256 /* Mask away directory-specific flags */
1257 if (!S_ISDIR(st->st_mode))
1258 f &= ~FS_DIRSYNC_FL;
1259
1260 procfs_fd = fd_reopen(fd, O_RDONLY|O_CLOEXEC|O_NOATIME);
1261 if (procfs_fd < 0)
1262 return log_error_errno(errno, "Failed to re-open '%s': %m", path);
1263
1264 r = chattr_fd(procfs_fd, f, item->attribute_mask);
1265 if (r < 0)
1266 log_full_errno(IN_SET(r, -ENOTTY, -EOPNOTSUPP) ? LOG_DEBUG : LOG_WARNING,
1267 r,
1268 "Cannot set file attribute for '%s', value=0x%08x, mask=0x%08x, ignoring: %m",
1269 path, item->attribute_value, item->attribute_mask);
1270
1271 return 0;
1272 }
1273
1274 static int path_set_attribute(Item *item, const char *path) {
1275 _cleanup_close_ int fd = -1;
1276
1277 if (!item->attribute_set || item->attribute_mask == 0)
1278 return 0;
1279
1280 fd = path_open_safe(path);
1281 if (fd < 0)
1282 return fd;
1283
1284 return fd_set_attribute(item, fd, path, NULL);
1285 }
1286
1287 static int write_one_file(Item *i, const char *path) {
1288 _cleanup_close_ int fd = -1, dir_fd = -1;
1289 char *bn;
1290 int r;
1291
1292 assert(i);
1293 assert(path);
1294 assert(i->argument);
1295 assert(i->type == WRITE_FILE);
1296
1297 /* Validate the path and keep the fd on the directory for opening the
1298 * file so we're sure that it can't be changed behind our back. */
1299 dir_fd = path_open_parent_safe(path);
1300 if (dir_fd < 0)
1301 return dir_fd;
1302
1303 bn = basename(path);
1304
1305 /* Follows symlinks */
1306 fd = openat(dir_fd, bn, O_NONBLOCK|O_CLOEXEC|O_WRONLY|O_NOCTTY, i->mode);
1307 if (fd < 0) {
1308 if (errno == ENOENT) {
1309 log_debug_errno(errno, "Not writing missing file \"%s\": %m", path);
1310 return 0;
1311 }
1312 return log_error_errno(errno, "Failed to open file \"%s\": %m", path);
1313 }
1314
1315 /* 'w' is allowed to write into any kind of files. */
1316 log_debug("Writing to \"%s\".", path);
1317
1318 r = loop_write(fd, i->argument, strlen(i->argument), false);
1319 if (r < 0)
1320 return log_error_errno(r, "Failed to write file \"%s\": %m", path);
1321
1322 return fd_set_perms(i, fd, path, NULL);
1323 }
1324
1325 static int create_file(Item *i, const char *path) {
1326 _cleanup_close_ int fd = -1, dir_fd = -1;
1327 struct stat stbuf, *st = NULL;
1328 int r = 0;
1329 char *bn;
1330
1331 assert(i);
1332 assert(path);
1333 assert(i->type == CREATE_FILE);
1334
1335 /* 'f' operates on regular files exclusively. */
1336
1337 /* Validate the path and keep the fd on the directory for opening the
1338 * file so we're sure that it can't be changed behind our back. */
1339 dir_fd = path_open_parent_safe(path);
1340 if (dir_fd < 0)
1341 return dir_fd;
1342
1343 bn = basename(path);
1344
1345 RUN_WITH_UMASK(0000) {
1346 mac_selinux_create_file_prepare(path, S_IFREG);
1347 fd = openat(dir_fd, bn, O_CREAT|O_EXCL|O_NOFOLLOW|O_NONBLOCK|O_CLOEXEC|O_WRONLY|O_NOCTTY, i->mode);
1348 mac_selinux_create_file_clear();
1349 }
1350
1351 if (fd < 0) {
1352 /* Even on a read-only filesystem, open(2) returns EEXIST if the
1353 * file already exists. It returns EROFS only if it needs to
1354 * create the file. */
1355 if (errno != EEXIST)
1356 return log_error_errno(errno, "Failed to create file %s: %m", path);
1357
1358 /* Re-open the file. At that point it must exist since open(2)
1359 * failed with EEXIST. We still need to check if the perms/mode
1360 * need to be changed. For read-only filesystems, we let
1361 * fd_set_perms() report the error if the perms need to be
1362 * modified. */
1363 fd = openat(dir_fd, bn, O_NOFOLLOW|O_CLOEXEC|O_PATH, i->mode);
1364 if (fd < 0)
1365 return log_error_errno(errno, "Failed to re-open file %s: %m", path);
1366
1367 if (fstat(fd, &stbuf) < 0)
1368 return log_error_errno(errno, "stat(%s) failed: %m", path);
1369
1370 if (!S_ISREG(stbuf.st_mode)) {
1371 log_error("%s exists and is not a regular file.", path);
1372 return -EEXIST;
1373 }
1374
1375 st = &stbuf;
1376 } else {
1377
1378 log_debug("\"%s\" has been created.", path);
1379
1380 if (i->argument) {
1381 log_debug("Writing to \"%s\".", path);
1382
1383 r = loop_write(fd, i->argument, strlen(i->argument), false);
1384 if (r < 0)
1385 return log_error_errno(r, "Failed to write file \"%s\": %m", path);
1386 }
1387 }
1388
1389 return fd_set_perms(i, fd, path, st);
1390 }
1391
1392 static int truncate_file(Item *i, const char *path) {
1393 _cleanup_close_ int fd = -1, dir_fd = -1;
1394 struct stat stbuf, *st = NULL;
1395 bool erofs = false;
1396 int r = 0;
1397 char *bn;
1398
1399 assert(i);
1400 assert(path);
1401 assert(i->type == TRUNCATE_FILE);
1402
1403 /* We want to operate on regular file exclusively especially since
1404 * O_TRUNC is unspecified if the file is neither a regular file nor a
1405 * fifo nor a terminal device. Therefore we first open the file and make
1406 * sure it's a regular one before truncating it. */
1407
1408 /* Validate the path and keep the fd on the directory for opening the
1409 * file so we're sure that it can't be changed behind our back. */
1410 dir_fd = path_open_parent_safe(path);
1411 if (dir_fd < 0)
1412 return dir_fd;
1413
1414 bn = basename(path);
1415
1416 RUN_WITH_UMASK(0000) {
1417 mac_selinux_create_file_prepare(path, S_IFREG);
1418 fd = openat(dir_fd, bn, O_CREAT|O_NOFOLLOW|O_NONBLOCK|O_CLOEXEC|O_WRONLY|O_NOCTTY, i->mode);
1419 mac_selinux_create_file_clear();
1420 }
1421
1422 if (fd < 0) {
1423 if (errno != EROFS)
1424 return log_error_errno(errno, "Failed to open/create file %s: %m", path);
1425
1426 /* On a read-only filesystem, we don't want to fail if the
1427 * target is already empty and the perms are set. So we still
1428 * proceed with the sanity checks and let the remaining
1429 * operations fail with EROFS if they try to modify the target
1430 * file. */
1431
1432 fd = openat(dir_fd, bn, O_NOFOLLOW|O_CLOEXEC|O_PATH, i->mode);
1433 if (fd < 0) {
1434 if (errno == ENOENT) {
1435 log_error("Cannot create file %s on a read-only file system.", path);
1436 return -EROFS;
1437 }
1438
1439 return log_error_errno(errno, "Failed to re-open file %s: %m", path);
1440 }
1441
1442 erofs = true;
1443 }
1444
1445 if (fstat(fd, &stbuf) < 0)
1446 return log_error_errno(errno, "stat(%s) failed: %m", path);
1447
1448 if (!S_ISREG(stbuf.st_mode)) {
1449 log_error("%s exists and is not a regular file.", path);
1450 return -EEXIST;
1451 }
1452
1453 if (stbuf.st_size > 0) {
1454 if (ftruncate(fd, 0) < 0) {
1455 r = erofs ? -EROFS : -errno;
1456 return log_error_errno(r, "Failed to truncate file %s: %m", path);
1457 }
1458 } else
1459 st = &stbuf;
1460
1461 log_debug("\"%s\" has been created.", path);
1462
1463 if (i->argument) {
1464 log_debug("Writing to \"%s\".", path);
1465
1466 r = loop_write(fd, i->argument, strlen(i->argument), false);
1467 if (r < 0) {
1468 r = erofs ? -EROFS : r;
1469 return log_error_errno(r, "Failed to write file %s: %m", path);
1470 }
1471 }
1472
1473 return fd_set_perms(i, fd, path, st);
1474 }
1475
1476 static int copy_files(Item *i) {
1477 _cleanup_close_ int dfd = -1, fd = -1;
1478 char *bn;
1479 int r;
1480
1481 log_debug("Copying tree \"%s\" to \"%s\".", i->argument, i->path);
1482
1483 bn = basename(i->path);
1484
1485 /* Validate the path and use the returned directory fd for copying the
1486 * target so we're sure that the path can't be changed behind our
1487 * back. */
1488 dfd = path_open_parent_safe(i->path);
1489 if (dfd < 0)
1490 return dfd;
1491
1492 r = copy_tree_at(AT_FDCWD, i->argument,
1493 dfd, bn,
1494 i->uid_set ? i->uid : UID_INVALID,
1495 i->gid_set ? i->gid : GID_INVALID,
1496 COPY_REFLINK);
1497 if (r < 0) {
1498 struct stat a, b;
1499
1500 /* If the target already exists on read-only filesystems, trying
1501 * to create the target will not fail with EEXIST but with
1502 * EROFS. */
1503 if (r == -EROFS && faccessat(dfd, bn, F_OK, AT_SYMLINK_NOFOLLOW) == 0)
1504 r = -EEXIST;
1505
1506 if (r != -EEXIST)
1507 return log_error_errno(r, "Failed to copy files to %s: %m", i->path);
1508
1509 if (stat(i->argument, &a) < 0)
1510 return log_error_errno(errno, "stat(%s) failed: %m", i->argument);
1511
1512 if (fstatat(dfd, bn, &b, AT_SYMLINK_NOFOLLOW) < 0)
1513 return log_error_errno(errno, "stat(%s) failed: %m", i->path);
1514
1515 if ((a.st_mode ^ b.st_mode) & S_IFMT) {
1516 log_debug("Can't copy to %s, file exists already and is of different type", i->path);
1517 return 0;
1518 }
1519 }
1520
1521 fd = openat(dfd, bn, O_NOFOLLOW|O_CLOEXEC|O_PATH);
1522 if (fd < 0)
1523 return log_error_errno(errno, "Failed to openat(%s): %m", i->path);
1524
1525 return fd_set_perms(i, fd, i->path, NULL);
1526 }
1527
1528 typedef enum {
1529 CREATION_NORMAL,
1530 CREATION_EXISTING,
1531 CREATION_FORCE,
1532 _CREATION_MODE_MAX,
1533 _CREATION_MODE_INVALID = -1
1534 } CreationMode;
1535
1536 static const char *creation_mode_verb_table[_CREATION_MODE_MAX] = {
1537 [CREATION_NORMAL] = "Created",
1538 [CREATION_EXISTING] = "Found existing",
1539 [CREATION_FORCE] = "Created replacement",
1540 };
1541
1542 DEFINE_PRIVATE_STRING_TABLE_LOOKUP_TO_STRING(creation_mode_verb, CreationMode);
1543
1544 static int create_directory_or_subvolume(const char *path, mode_t mode, bool subvol) {
1545 _cleanup_close_ int pfd = -1;
1546 CreationMode creation;
1547 int r;
1548
1549 assert(path);
1550
1551 pfd = path_open_parent_safe(path);
1552 if (pfd < 0)
1553 return pfd;
1554
1555 if (subvol) {
1556 if (btrfs_is_subvol(empty_to_root(arg_root)) <= 0)
1557
1558 /* Don't create a subvolume unless the root directory is
1559 * one, too. We do this under the assumption that if the
1560 * root directory is just a plain directory (i.e. very
1561 * light-weight), we shouldn't try to split it up into
1562 * subvolumes (i.e. more heavy-weight). Thus, chroot()
1563 * environments and suchlike will get a full brtfs
1564 * subvolume set up below their tree only if they
1565 * specifically set up a btrfs subvolume for the root
1566 * dir too. */
1567
1568 subvol = false;
1569 else {
1570 RUN_WITH_UMASK((~mode) & 0777)
1571 r = btrfs_subvol_make_fd(pfd, basename(path));
1572 }
1573 } else
1574 r = 0;
1575
1576 if (!subvol || r == -ENOTTY)
1577 RUN_WITH_UMASK(0000)
1578 r = mkdirat_label(pfd, basename(path), mode);
1579
1580 if (r < 0) {
1581 int k;
1582
1583 if (!IN_SET(r, -EEXIST, -EROFS))
1584 return log_error_errno(r, "Failed to create directory or subvolume \"%s\": %m", path);
1585
1586 k = is_dir_fd(pfd);
1587 if (k == -ENOENT && r == -EROFS)
1588 return log_error_errno(r, "%s does not exist and cannot be created as the file system is read-only.", path);
1589 if (k < 0)
1590 return log_error_errno(k, "Failed to check if %s exists: %m", path);
1591 if (!k) {
1592 log_warning("\"%s\" already exists and is not a directory.", path);
1593 return -EEXIST;
1594 }
1595
1596 creation = CREATION_EXISTING;
1597 } else
1598 creation = CREATION_NORMAL;
1599
1600 log_debug("%s directory \"%s\".", creation_mode_verb_to_string(creation), path);
1601
1602 r = openat(pfd, basename(path), O_NOCTTY|O_CLOEXEC|O_DIRECTORY);
1603 if (r < 0)
1604 return log_error_errno(errno, "Failed to open directory '%s': %m", basename(path));
1605
1606 return r;
1607 }
1608
1609 static int create_directory(Item *i, const char *path) {
1610 _cleanup_close_ int fd = -1;
1611
1612 assert(i);
1613 assert(IN_SET(i->type, CREATE_DIRECTORY, TRUNCATE_DIRECTORY));
1614
1615 fd = create_directory_or_subvolume(path, i->mode, false);
1616 if (fd == -EEXIST)
1617 return 0;
1618 if (fd < 0)
1619 return fd;
1620
1621 return fd_set_perms(i, fd, path, NULL);
1622 }
1623
1624 static int create_subvolume(Item *i, const char *path) {
1625 _cleanup_close_ int fd = -1;
1626 int r, q = 0;
1627
1628 assert(i);
1629 assert(IN_SET(i->type, CREATE_SUBVOLUME, CREATE_SUBVOLUME_NEW_QUOTA, CREATE_SUBVOLUME_INHERIT_QUOTA));
1630
1631 fd = create_directory_or_subvolume(path, i->mode, true);
1632 if (fd == -EEXIST)
1633 return 0;
1634 if (fd < 0)
1635 return fd;
1636
1637 if (IN_SET(i->type, CREATE_SUBVOLUME_NEW_QUOTA, CREATE_SUBVOLUME_INHERIT_QUOTA)) {
1638 r = btrfs_subvol_auto_qgroup_fd(fd, 0, i->type == CREATE_SUBVOLUME_NEW_QUOTA);
1639 if (r == -ENOTTY)
1640 log_debug_errno(r, "Couldn't adjust quota for subvolume \"%s\" (unsupported fs or dir not a subvolume): %m", i->path);
1641 else if (r == -EROFS)
1642 log_debug_errno(r, "Couldn't adjust quota for subvolume \"%s\" (fs is read-only).", i->path);
1643 else if (r == -ENOPROTOOPT)
1644 log_debug_errno(r, "Couldn't adjust quota for subvolume \"%s\" (quota support is disabled).", i->path);
1645 else if (r < 0)
1646 q = log_error_errno(r, "Failed to adjust quota for subvolume \"%s\": %m", i->path);
1647 else if (r > 0)
1648 log_debug("Adjusted quota for subvolume \"%s\".", i->path);
1649 else if (r == 0)
1650 log_debug("Quota for subvolume \"%s\" already in place, no change made.", i->path);
1651 }
1652
1653 r = fd_set_perms(i, fd, path, NULL);
1654 if (q < 0) /* prefer the quota change error from above */
1655 return q;
1656
1657 return r;
1658 }
1659
1660 static int empty_directory(Item *i, const char *path) {
1661 int r;
1662
1663 assert(i);
1664 assert(i->type == EMPTY_DIRECTORY);
1665
1666 r = is_dir(path, false);
1667 if (r == -ENOENT) {
1668 /* Option "e" operates only on existing objects. Do not
1669 * print errors about non-existent files or directories */
1670 log_debug("Skipping missing directory: %s", path);
1671 return 0;
1672 }
1673 if (r < 0)
1674 return log_error_errno(r, "is_dir() failed on path %s: %m", path);
1675 if (r == 0) {
1676 log_error("'%s' already exists and is not a directory.", path);
1677 return -EEXIST;
1678 }
1679
1680 return path_set_perms(i, path);
1681 }
1682
1683 static int create_device(Item *i, mode_t file_type) {
1684 _cleanup_close_ int dfd = -1, fd = -1;
1685 CreationMode creation;
1686 char *bn;
1687 int r;
1688
1689 assert(i);
1690 assert(IN_SET(file_type, S_IFBLK, S_IFCHR));
1691
1692 bn = basename(i->path);
1693
1694 /* Validate the path and use the returned directory fd for copying the
1695 * target so we're sure that the path can't be changed behind our
1696 * back. */
1697 dfd = path_open_parent_safe(i->path);
1698 if (dfd < 0)
1699 return dfd;
1700
1701 RUN_WITH_UMASK(0000) {
1702 mac_selinux_create_file_prepare(i->path, file_type);
1703 r = mknodat(dfd, bn, i->mode | file_type, i->major_minor);
1704 mac_selinux_create_file_clear();
1705 }
1706
1707 if (r < 0) {
1708 struct stat st;
1709
1710 if (errno == EPERM) {
1711 log_debug("We lack permissions, possibly because of cgroup configuration; "
1712 "skipping creation of device node %s.", i->path);
1713 return 0;
1714 }
1715
1716 if (errno != EEXIST)
1717 return log_error_errno(errno, "Failed to create device node %s: %m", i->path);
1718
1719 if (fstatat(dfd, bn, &st, 0) < 0)
1720 return log_error_errno(errno, "stat(%s) failed: %m", i->path);
1721
1722 if ((st.st_mode & S_IFMT) != file_type) {
1723
1724 if (i->force) {
1725
1726 RUN_WITH_UMASK(0000) {
1727 mac_selinux_create_file_prepare(i->path, file_type);
1728 /* FIXME: need to introduce mknodat_atomic() */
1729 r = mknod_atomic(i->path, i->mode | file_type, i->major_minor);
1730 mac_selinux_create_file_clear();
1731 }
1732
1733 if (r < 0)
1734 return log_error_errno(r, "Failed to create device node \"%s\": %m", i->path);
1735 creation = CREATION_FORCE;
1736 } else {
1737 log_debug("%s is not a device node.", i->path);
1738 return 0;
1739 }
1740 } else
1741 creation = CREATION_EXISTING;
1742 } else
1743 creation = CREATION_NORMAL;
1744
1745 log_debug("%s %s device node \"%s\" %u:%u.",
1746 creation_mode_verb_to_string(creation),
1747 i->type == CREATE_BLOCK_DEVICE ? "block" : "char",
1748 i->path, major(i->mode), minor(i->mode));
1749
1750 fd = openat(dfd, bn, O_NOFOLLOW|O_CLOEXEC|O_PATH);
1751 if (fd < 0)
1752 return log_error_errno(errno, "Failed to openat(%s): %m", i->path);
1753
1754 return fd_set_perms(i, fd, i->path, NULL);
1755 }
1756
1757 static int create_fifo(Item *i, const char *path) {
1758 _cleanup_close_ int pfd = -1, fd = -1;
1759 CreationMode creation;
1760 struct stat st;
1761 char *bn;
1762 int r;
1763
1764 pfd = path_open_parent_safe(path);
1765 if (pfd < 0)
1766 return pfd;
1767
1768 bn = basename(path);
1769
1770 RUN_WITH_UMASK(0000) {
1771 mac_selinux_create_file_prepare(path, S_IFIFO);
1772 r = mkfifoat(pfd, bn, i->mode);
1773 mac_selinux_create_file_clear();
1774 }
1775
1776 if (r < 0) {
1777 if (errno != EEXIST)
1778 return log_error_errno(errno, "Failed to create fifo %s: %m", path);
1779
1780 if (fstatat(pfd, bn, &st, AT_SYMLINK_NOFOLLOW) < 0)
1781 return log_error_errno(errno, "stat(%s) failed: %m", path);
1782
1783 if (!S_ISFIFO(st.st_mode)) {
1784
1785 if (i->force) {
1786 RUN_WITH_UMASK(0000) {
1787 mac_selinux_create_file_prepare(path, S_IFIFO);
1788 r = mkfifoat_atomic(pfd, bn, i->mode);
1789 mac_selinux_create_file_clear();
1790 }
1791
1792 if (r < 0)
1793 return log_error_errno(r, "Failed to create fifo %s: %m", path);
1794 creation = CREATION_FORCE;
1795 } else {
1796 log_warning("\"%s\" already exists and is not a fifo.", path);
1797 return 0;
1798 }
1799 } else
1800 creation = CREATION_EXISTING;
1801 } else
1802 creation = CREATION_NORMAL;
1803
1804 log_debug("%s fifo \"%s\".", creation_mode_verb_to_string(creation), path);
1805
1806 fd = openat(pfd, bn, O_NOFOLLOW|O_CLOEXEC|O_PATH);
1807 if (fd < 0)
1808 return log_error_errno(fd, "Failed to openat(%s): %m", path);
1809
1810 return fd_set_perms(i, fd, i->path, NULL);
1811 }
1812
1813 typedef int (*action_t)(Item *i, const char *path);
1814 typedef int (*fdaction_t)(Item *i, int fd, const char *path, const struct stat *st);
1815
1816 static int item_do(Item *i, int fd, const char *path, fdaction_t action) {
1817 struct stat st;
1818 int r = 0, q;
1819
1820 assert(i);
1821 assert(fd >= 0);
1822
1823 if (fstat(fd, &st) < 0) {
1824 r = log_error_errno(errno, "fstat() on file failed: %m");
1825 goto finish;
1826 }
1827
1828 /* This returns the first error we run into, but nevertheless
1829 * tries to go on */
1830 r = action(i, fd, path, &st);
1831
1832 if (S_ISDIR(st.st_mode)) {
1833 char procfs_path[STRLEN("/proc/self/fd/") + DECIMAL_STR_MAX(int)];
1834 _cleanup_closedir_ DIR *d = NULL;
1835 struct dirent *de;
1836
1837 /* The passed 'fd' was opened with O_PATH. We need to convert
1838 * it into a 'regular' fd before reading the directory content. */
1839 xsprintf(procfs_path, "/proc/self/fd/%i", fd);
1840
1841 d = opendir(procfs_path);
1842 if (!d) {
1843 log_error_errno(errno, "Failed to opendir() '%s': %m", procfs_path);
1844 if (r == 0)
1845 r = -errno;
1846 goto finish;
1847 }
1848
1849 FOREACH_DIRENT_ALL(de, d, q = -errno; goto finish) {
1850 int de_fd;
1851
1852 if (dot_or_dot_dot(de->d_name))
1853 continue;
1854
1855 de_fd = openat(fd, de->d_name, O_NOFOLLOW|O_CLOEXEC|O_PATH);
1856 if (de_fd < 0)
1857 q = log_error_errno(errno, "Failed to open() file '%s': %m", de->d_name);
1858 else
1859 /* Pass ownership of dirent fd over */
1860 q = item_do(i, de_fd, NULL, action);
1861
1862 if (q < 0 && r == 0)
1863 r = q;
1864 }
1865 }
1866 finish:
1867 safe_close(fd);
1868 return r;
1869 }
1870
1871 static int glob_item(Item *i, action_t action) {
1872 _cleanup_globfree_ glob_t g = {
1873 .gl_opendir = (void *(*)(const char *)) opendir_nomod,
1874 };
1875 int r = 0, k;
1876 char **fn;
1877
1878 k = safe_glob(i->path, GLOB_NOSORT|GLOB_BRACE, &g);
1879 if (k < 0 && k != -ENOENT)
1880 return log_error_errno(k, "glob(%s) failed: %m", i->path);
1881
1882 STRV_FOREACH(fn, g.gl_pathv) {
1883 k = action(i, *fn);
1884 if (k < 0 && r == 0)
1885 r = k;
1886 }
1887
1888 return r;
1889 }
1890
1891 static int glob_item_recursively(Item *i, fdaction_t action) {
1892 _cleanup_globfree_ glob_t g = {
1893 .gl_opendir = (void *(*)(const char *)) opendir_nomod,
1894 };
1895 int r = 0, k;
1896 char **fn;
1897
1898 k = safe_glob(i->path, GLOB_NOSORT|GLOB_BRACE, &g);
1899 if (k < 0 && k != -ENOENT)
1900 return log_error_errno(k, "glob(%s) failed: %m", i->path);
1901
1902 STRV_FOREACH(fn, g.gl_pathv) {
1903 _cleanup_close_ int fd = -1;
1904
1905 /* Make sure we won't trigger/follow file object (such as
1906 * device nodes, automounts, ...) pointed out by 'fn' with
1907 * O_PATH. Note, when O_PATH is used, flags other than
1908 * O_CLOEXEC, O_DIRECTORY, and O_NOFOLLOW are ignored. */
1909
1910 fd = open(*fn, O_CLOEXEC|O_NOFOLLOW|O_PATH);
1911 if (fd < 0) {
1912 log_error_errno(errno, "Opening '%s' failed: %m", *fn);
1913 if (r == 0)
1914 r = -errno;
1915 continue;
1916 }
1917
1918 k = item_do(i, fd, *fn, action);
1919 if (k < 0 && r == 0)
1920 r = k;
1921
1922 /* we passed fd ownership to the previous call */
1923 fd = -1;
1924 }
1925
1926 return r;
1927 }
1928
1929 static int create_item(Item *i) {
1930 CreationMode creation;
1931 int r = 0;
1932
1933 assert(i);
1934
1935 log_debug("Running create action for entry %c %s", (char) i->type, i->path);
1936
1937 switch (i->type) {
1938
1939 case IGNORE_PATH:
1940 case IGNORE_DIRECTORY_PATH:
1941 case REMOVE_PATH:
1942 case RECURSIVE_REMOVE_PATH:
1943 return 0;
1944
1945 case CREATE_FILE:
1946 RUN_WITH_UMASK(0000)
1947 (void) mkdir_parents_label(i->path, 0755);
1948
1949 r = create_file(i, i->path);
1950 if (r < 0)
1951 return r;
1952 break;
1953
1954 case TRUNCATE_FILE:
1955 RUN_WITH_UMASK(0000)
1956 (void) mkdir_parents_label(i->path, 0755);
1957
1958 r = truncate_file(i, i->path);
1959 if (r < 0)
1960 return r;
1961 break;
1962
1963 case COPY_FILES:
1964 RUN_WITH_UMASK(0000)
1965 (void) mkdir_parents_label(i->path, 0755);
1966
1967 r = copy_files(i);
1968 if (r < 0)
1969 return r;
1970 break;
1971
1972 case WRITE_FILE:
1973 r = glob_item(i, write_one_file);
1974 if (r < 0)
1975 return r;
1976
1977 break;
1978
1979 case CREATE_DIRECTORY:
1980 case TRUNCATE_DIRECTORY:
1981 RUN_WITH_UMASK(0000)
1982 (void) mkdir_parents_label(i->path, 0755);
1983
1984 r = create_directory(i, i->path);
1985 if (r < 0)
1986 return r;
1987 break;
1988
1989 case CREATE_SUBVOLUME:
1990 case CREATE_SUBVOLUME_INHERIT_QUOTA:
1991 case CREATE_SUBVOLUME_NEW_QUOTA:
1992 RUN_WITH_UMASK(0000)
1993 (void) mkdir_parents_label(i->path, 0755);
1994
1995 r = create_subvolume(i, i->path);
1996 if (r < 0)
1997 return r;
1998 break;
1999
2000 case EMPTY_DIRECTORY:
2001 r = glob_item(i, empty_directory);
2002 if (r < 0)
2003 return r;
2004 break;
2005
2006 case CREATE_FIFO:
2007 RUN_WITH_UMASK(0000)
2008 (void) mkdir_parents_label(i->path, 0755);
2009
2010 r = create_fifo(i, i->path);
2011 if (r < 0)
2012 return r;
2013 break;
2014
2015 case CREATE_SYMLINK: {
2016 RUN_WITH_UMASK(0000)
2017 (void) mkdir_parents_label(i->path, 0755);
2018
2019 mac_selinux_create_file_prepare(i->path, S_IFLNK);
2020 r = symlink(i->argument, i->path);
2021 mac_selinux_create_file_clear();
2022
2023 if (r < 0) {
2024 _cleanup_free_ char *x = NULL;
2025
2026 if (errno != EEXIST)
2027 return log_error_errno(errno, "symlink(%s, %s) failed: %m", i->argument, i->path);
2028
2029 r = readlink_malloc(i->path, &x);
2030 if (r < 0 || !streq(i->argument, x)) {
2031
2032 if (i->force) {
2033 mac_selinux_create_file_prepare(i->path, S_IFLNK);
2034 r = symlink_atomic(i->argument, i->path);
2035 mac_selinux_create_file_clear();
2036
2037 if (IN_SET(r, -EISDIR, -EEXIST, -ENOTEMPTY)) {
2038 r = rm_rf(i->path, REMOVE_ROOT|REMOVE_PHYSICAL);
2039 if (r < 0)
2040 return log_error_errno(r, "rm -fr %s failed: %m", i->path);
2041
2042 mac_selinux_create_file_prepare(i->path, S_IFLNK);
2043 r = symlink(i->argument, i->path) < 0 ? -errno : 0;
2044 mac_selinux_create_file_clear();
2045 }
2046 if (r < 0)
2047 return log_error_errno(r, "symlink(%s, %s) failed: %m", i->argument, i->path);
2048
2049 creation = CREATION_FORCE;
2050 } else {
2051 log_debug("\"%s\" is not a symlink or does not point to the correct path.", i->path);
2052 return 0;
2053 }
2054 } else
2055 creation = CREATION_EXISTING;
2056 } else
2057
2058 creation = CREATION_NORMAL;
2059 log_debug("%s symlink \"%s\".", creation_mode_verb_to_string(creation), i->path);
2060 break;
2061 }
2062
2063 case CREATE_BLOCK_DEVICE:
2064 case CREATE_CHAR_DEVICE:
2065 if (have_effective_cap(CAP_MKNOD) == 0) {
2066 /* In a container we lack CAP_MKNOD. We
2067 shouldn't attempt to create the device node in
2068 that case to avoid noise, and we don't support
2069 virtualized devices in containers anyway. */
2070
2071 log_debug("We lack CAP_MKNOD, skipping creation of device node %s.", i->path);
2072 return 0;
2073 }
2074
2075 RUN_WITH_UMASK(0000)
2076 (void) mkdir_parents_label(i->path, 0755);
2077
2078 r = create_device(i, i->type == CREATE_BLOCK_DEVICE ? S_IFBLK : S_IFCHR);
2079 if (r < 0)
2080 return r;
2081
2082 break;
2083
2084 case ADJUST_MODE:
2085 case RELABEL_PATH:
2086 r = glob_item(i, path_set_perms);
2087 if (r < 0)
2088 return r;
2089 break;
2090
2091 case RECURSIVE_RELABEL_PATH:
2092 r = glob_item_recursively(i, fd_set_perms);
2093 if (r < 0)
2094 return r;
2095 break;
2096
2097 case SET_XATTR:
2098 r = glob_item(i, path_set_xattrs);
2099 if (r < 0)
2100 return r;
2101 break;
2102
2103 case RECURSIVE_SET_XATTR:
2104 r = glob_item_recursively(i, fd_set_xattrs);
2105 if (r < 0)
2106 return r;
2107 break;
2108
2109 case SET_ACL:
2110 r = glob_item(i, path_set_acls);
2111 if (r < 0)
2112 return r;
2113 break;
2114
2115 case RECURSIVE_SET_ACL:
2116 r = glob_item_recursively(i, fd_set_acls);
2117 if (r < 0)
2118 return r;
2119 break;
2120
2121 case SET_ATTRIBUTE:
2122 r = glob_item(i, path_set_attribute);
2123 if (r < 0)
2124 return r;
2125 break;
2126
2127 case RECURSIVE_SET_ATTRIBUTE:
2128 r = glob_item_recursively(i, fd_set_attribute);
2129 if (r < 0)
2130 return r;
2131 break;
2132 }
2133
2134 return 0;
2135 }
2136
2137 static int remove_item_instance(Item *i, const char *instance) {
2138 int r;
2139
2140 assert(i);
2141
2142 switch (i->type) {
2143
2144 case REMOVE_PATH:
2145 if (remove(instance) < 0 && errno != ENOENT)
2146 return log_error_errno(errno, "rm(%s): %m", instance);
2147
2148 break;
2149
2150 case TRUNCATE_DIRECTORY:
2151 case RECURSIVE_REMOVE_PATH:
2152 /* FIXME: we probably should use dir_cleanup() here
2153 * instead of rm_rf() so that 'x' is honoured. */
2154 log_debug("rm -rf \"%s\"", instance);
2155 r = rm_rf(instance, (i->type == RECURSIVE_REMOVE_PATH ? REMOVE_ROOT|REMOVE_SUBVOLUME : 0) | REMOVE_PHYSICAL);
2156 if (r < 0 && r != -ENOENT)
2157 return log_error_errno(r, "rm_rf(%s): %m", instance);
2158
2159 break;
2160
2161 default:
2162 assert_not_reached("wut?");
2163 }
2164
2165 return 0;
2166 }
2167
2168 static int remove_item(Item *i) {
2169 assert(i);
2170
2171 log_debug("Running remove action for entry %c %s", (char) i->type, i->path);
2172
2173 switch (i->type) {
2174
2175 case REMOVE_PATH:
2176 case TRUNCATE_DIRECTORY:
2177 case RECURSIVE_REMOVE_PATH:
2178 return glob_item(i, remove_item_instance);
2179
2180 default:
2181 return 0;
2182 }
2183 }
2184
2185 static int clean_item_instance(Item *i, const char* instance) {
2186 _cleanup_closedir_ DIR *d = NULL;
2187 struct stat s, ps;
2188 bool mountpoint;
2189 usec_t cutoff, n;
2190 char timestamp[FORMAT_TIMESTAMP_MAX];
2191
2192 assert(i);
2193
2194 if (!i->age_set)
2195 return 0;
2196
2197 n = now(CLOCK_REALTIME);
2198 if (n < i->age)
2199 return 0;
2200
2201 cutoff = n - i->age;
2202
2203 d = opendir_nomod(instance);
2204 if (!d) {
2205 if (IN_SET(errno, ENOENT, ENOTDIR)) {
2206 log_debug_errno(errno, "Directory \"%s\": %m", instance);
2207 return 0;
2208 }
2209
2210 return log_error_errno(errno, "Failed to open directory %s: %m", instance);
2211 }
2212
2213 if (fstat(dirfd(d), &s) < 0)
2214 return log_error_errno(errno, "stat(%s) failed: %m", i->path);
2215
2216 if (!S_ISDIR(s.st_mode)) {
2217 log_error("%s is not a directory.", i->path);
2218 return -ENOTDIR;
2219 }
2220
2221 if (fstatat(dirfd(d), "..", &ps, AT_SYMLINK_NOFOLLOW) != 0)
2222 return log_error_errno(errno, "stat(%s/..) failed: %m", i->path);
2223
2224 mountpoint = s.st_dev != ps.st_dev || s.st_ino == ps.st_ino;
2225
2226 log_debug("Cleanup threshold for %s \"%s\" is %s",
2227 mountpoint ? "mount point" : "directory",
2228 instance,
2229 format_timestamp_us(timestamp, sizeof(timestamp), cutoff));
2230
2231 return dir_cleanup(i, instance, d, &s, cutoff, s.st_dev, mountpoint,
2232 MAX_DEPTH, i->keep_first_level);
2233 }
2234
2235 static int clean_item(Item *i) {
2236 assert(i);
2237
2238 log_debug("Running clean action for entry %c %s", (char) i->type, i->path);
2239
2240 switch (i->type) {
2241 case CREATE_DIRECTORY:
2242 case CREATE_SUBVOLUME:
2243 case CREATE_SUBVOLUME_INHERIT_QUOTA:
2244 case CREATE_SUBVOLUME_NEW_QUOTA:
2245 case TRUNCATE_DIRECTORY:
2246 case IGNORE_PATH:
2247 case COPY_FILES:
2248 clean_item_instance(i, i->path);
2249 return 0;
2250 case EMPTY_DIRECTORY:
2251 case IGNORE_DIRECTORY_PATH:
2252 return glob_item(i, clean_item_instance);
2253 default:
2254 return 0;
2255 }
2256 }
2257
2258 static int process_item_array(ItemArray *array);
2259
2260 static int process_item(Item *i) {
2261 int r, q, p, t = 0;
2262 _cleanup_free_ char *prefix = NULL;
2263
2264 assert(i);
2265
2266 if (i->done)
2267 return 0;
2268
2269 i->done = true;
2270
2271 prefix = malloc(strlen(i->path) + 1);
2272 if (!prefix)
2273 return log_oom();
2274
2275 PATH_FOREACH_PREFIX(prefix, i->path) {
2276 ItemArray *j;
2277
2278 j = ordered_hashmap_get(items, prefix);
2279 if (j) {
2280 int s;
2281
2282 s = process_item_array(j);
2283 if (s < 0 && t == 0)
2284 t = s;
2285 }
2286 }
2287
2288 if (chase_symlinks(i->path, NULL, CHASE_NO_AUTOFS, NULL) == -EREMOTE)
2289 return t;
2290
2291 r = arg_create ? create_item(i) : 0;
2292 q = arg_remove ? remove_item(i) : 0;
2293 p = arg_clean ? clean_item(i) : 0;
2294
2295 return t < 0 ? t :
2296 r < 0 ? r :
2297 q < 0 ? q :
2298 p;
2299 }
2300
2301 static int process_item_array(ItemArray *array) {
2302 unsigned n;
2303 int r = 0, k;
2304
2305 assert(array);
2306
2307 for (n = 0; n < array->count; n++) {
2308 k = process_item(array->items + n);
2309 if (k < 0 && r == 0)
2310 r = k;
2311 }
2312
2313 return r;
2314 }
2315
2316 static void item_free_contents(Item *i) {
2317 assert(i);
2318 free(i->path);
2319 free(i->argument);
2320 strv_free(i->xattrs);
2321
2322 #if HAVE_ACL
2323 acl_free(i->acl_access);
2324 acl_free(i->acl_default);
2325 #endif
2326 }
2327
2328 static void item_array_free(ItemArray *a) {
2329 unsigned n;
2330
2331 if (!a)
2332 return;
2333
2334 for (n = 0; n < a->count; n++)
2335 item_free_contents(a->items + n);
2336 free(a->items);
2337 free(a);
2338 }
2339
2340 static int item_compare(const void *a, const void *b) {
2341 const Item *x = a, *y = b;
2342
2343 /* Make sure that the ownership taking item is put first, so
2344 * that we first create the node, and then can adjust it */
2345
2346 if (takes_ownership(x->type) && !takes_ownership(y->type))
2347 return -1;
2348 if (!takes_ownership(x->type) && takes_ownership(y->type))
2349 return 1;
2350
2351 return (int) x->type - (int) y->type;
2352 }
2353
2354 static bool item_compatible(Item *a, Item *b) {
2355 assert(a);
2356 assert(b);
2357 assert(streq(a->path, b->path));
2358
2359 if (takes_ownership(a->type) && takes_ownership(b->type))
2360 /* check if the items are the same */
2361 return streq_ptr(a->argument, b->argument) &&
2362
2363 a->uid_set == b->uid_set &&
2364 a->uid == b->uid &&
2365
2366 a->gid_set == b->gid_set &&
2367 a->gid == b->gid &&
2368
2369 a->mode_set == b->mode_set &&
2370 a->mode == b->mode &&
2371
2372 a->age_set == b->age_set &&
2373 a->age == b->age &&
2374
2375 a->mask_perms == b->mask_perms &&
2376
2377 a->keep_first_level == b->keep_first_level &&
2378
2379 a->major_minor == b->major_minor;
2380
2381 return true;
2382 }
2383
2384 static bool should_include_path(const char *path) {
2385 char **prefix;
2386
2387 STRV_FOREACH(prefix, arg_exclude_prefixes)
2388 if (path_startswith(path, *prefix)) {
2389 log_debug("Entry \"%s\" matches exclude prefix \"%s\", skipping.",
2390 path, *prefix);
2391 return false;
2392 }
2393
2394 STRV_FOREACH(prefix, arg_include_prefixes)
2395 if (path_startswith(path, *prefix)) {
2396 log_debug("Entry \"%s\" matches include prefix \"%s\".", path, *prefix);
2397 return true;
2398 }
2399
2400 /* no matches, so we should include this path only if we
2401 * have no whitelist at all */
2402 if (strv_isempty(arg_include_prefixes))
2403 return true;
2404
2405 log_debug("Entry \"%s\" does not match any include prefix, skipping.", path);
2406 return false;
2407 }
2408
2409 static int specifier_expansion_from_arg(Item *i) {
2410 _cleanup_free_ char *unescaped = NULL, *resolved = NULL;
2411 char **xattr;
2412 int r;
2413
2414 assert(i);
2415
2416 if (i->argument == NULL)
2417 return 0;
2418
2419 switch (i->type) {
2420 case COPY_FILES:
2421 case CREATE_SYMLINK:
2422 case CREATE_FILE:
2423 case TRUNCATE_FILE:
2424 case WRITE_FILE:
2425 r = cunescape(i->argument, 0, &unescaped);
2426 if (r < 0)
2427 return log_error_errno(r, "Failed to unescape parameter to write: %s", i->argument);
2428
2429 r = specifier_printf(unescaped, specifier_table, NULL, &resolved);
2430 if (r < 0)
2431 return r;
2432
2433 free_and_replace(i->argument, resolved);
2434 break;
2435
2436 case SET_XATTR:
2437 case RECURSIVE_SET_XATTR:
2438 assert(i->xattrs);
2439
2440 STRV_FOREACH (xattr, i->xattrs) {
2441 r = specifier_printf(*xattr, specifier_table, NULL, &resolved);
2442 if (r < 0)
2443 return r;
2444
2445 free_and_replace(*xattr, resolved);
2446 }
2447 break;
2448
2449 default:
2450 break;
2451 }
2452 return 0;
2453 }
2454
2455 static int patch_var_run(const char *fname, unsigned line, char **path) {
2456 const char *k;
2457 char *n;
2458
2459 assert(path);
2460 assert(*path);
2461
2462 /* Optionally rewrites lines referencing /var/run/, to use /run/ instead. Why bother? tmpfiles merges lines in
2463 * some cases and detects conflicts in others. If files/directories are specified through two equivalent lines
2464 * this is problematic as neither case will be detected. Ideally we'd detect these cases by resolving symlinks
2465 * early, but that's precisely not what we can do here as this code very likely is running very early on, at a
2466 * time where the paths in question are not available yet, or even more importantly, our own tmpfiles rules
2467 * might create the paths that are intermediary to the listed paths. We can't really cover the generic case,
2468 * but the least we can do is cover the specific case of /var/run vs. /run, as /var/run is a legacy name for
2469 * /run only, and we explicitly document that and require that on systemd systems the former is a symlink to
2470 * the latter. Moreover files below this path are by far the primary usecase for tmpfiles.d/. */
2471
2472 k = path_startswith(*path, "/var/run/");
2473 if (isempty(k)) /* Don't complain about other paths than /var/run, and not about /var/run itself either. */
2474 return 0;
2475
2476 n = strjoin("/run/", k);
2477 if (!n)
2478 return log_oom();
2479
2480 /* Also log about this briefly. We do so at LOG_NOTICE level, as we fixed up the situation automatically, hence
2481 * there's no immediate need for action by the user. However, in the interest of making things less confusing
2482 * to the user, let's still inform the user that these snippets should really be updated. */
2483
2484 log_notice("[%s:%u] Line references path below legacy directory /var/run/, updating %s → %s; please update the tmpfiles.d/ drop-in file accordingly.", fname, line, *path, n);
2485
2486 free(*path);
2487 *path = n;
2488
2489 return 0;
2490 }
2491
2492 static int parse_line(const char *fname, unsigned line, const char *buffer, bool *invalid_config) {
2493
2494 _cleanup_free_ char *action = NULL, *mode = NULL, *user = NULL, *group = NULL, *age = NULL, *path = NULL;
2495 _cleanup_(item_free_contents) Item i = {};
2496 ItemArray *existing;
2497 OrderedHashmap *h;
2498 int r, pos;
2499 bool force = false, boot = false;
2500
2501 assert(fname);
2502 assert(line >= 1);
2503 assert(buffer);
2504
2505 r = extract_many_words(
2506 &buffer,
2507 NULL,
2508 EXTRACT_QUOTES,
2509 &action,
2510 &path,
2511 &mode,
2512 &user,
2513 &group,
2514 &age,
2515 NULL);
2516 if (r < 0) {
2517 if (IN_SET(r, -EINVAL, -EBADSLT))
2518 /* invalid quoting and such or an unknown specifier */
2519 *invalid_config = true;
2520 return log_error_errno(r, "[%s:%u] Failed to parse line: %m", fname, line);
2521 } else if (r < 2) {
2522 *invalid_config = true;
2523 log_error("[%s:%u] Syntax error.", fname, line);
2524 return -EIO;
2525 }
2526
2527 if (!isempty(buffer) && !streq(buffer, "-")) {
2528 i.argument = strdup(buffer);
2529 if (!i.argument)
2530 return log_oom();
2531 }
2532
2533 if (isempty(action)) {
2534 *invalid_config = true;
2535 log_error("[%s:%u] Command too short '%s'.", fname, line, action);
2536 return -EINVAL;
2537 }
2538
2539 for (pos = 1; action[pos]; pos++) {
2540 if (action[pos] == '!' && !boot)
2541 boot = true;
2542 else if (action[pos] == '+' && !force)
2543 force = true;
2544 else {
2545 *invalid_config = true;
2546 log_error("[%s:%u] Unknown modifiers in command '%s'",
2547 fname, line, action);
2548 return -EINVAL;
2549 }
2550 }
2551
2552 if (boot && !arg_boot) {
2553 log_debug("Ignoring entry %s \"%s\" because --boot is not specified.",
2554 action, path);
2555 return 0;
2556 }
2557
2558 i.type = action[0];
2559 i.force = force;
2560
2561 r = specifier_printf(path, specifier_table, NULL, &i.path);
2562 if (r == -ENXIO)
2563 return log_unresolvable_specifier(fname, line);
2564 if (r < 0) {
2565 if (IN_SET(r, -EINVAL, -EBADSLT))
2566 *invalid_config = true;
2567 return log_error_errno(r, "[%s:%u] Failed to replace specifiers: %s", fname, line, path);
2568 }
2569
2570 r = patch_var_run(fname, line, &i.path);
2571 if (r < 0)
2572 return r;
2573
2574 switch (i.type) {
2575
2576 case CREATE_DIRECTORY:
2577 case CREATE_SUBVOLUME:
2578 case CREATE_SUBVOLUME_INHERIT_QUOTA:
2579 case CREATE_SUBVOLUME_NEW_QUOTA:
2580 case EMPTY_DIRECTORY:
2581 case TRUNCATE_DIRECTORY:
2582 case CREATE_FIFO:
2583 case IGNORE_PATH:
2584 case IGNORE_DIRECTORY_PATH:
2585 case REMOVE_PATH:
2586 case RECURSIVE_REMOVE_PATH:
2587 case ADJUST_MODE:
2588 case RELABEL_PATH:
2589 case RECURSIVE_RELABEL_PATH:
2590 if (i.argument)
2591 log_warning("[%s:%u] %c lines don't take argument fields, ignoring.", fname, line, i.type);
2592
2593 break;
2594
2595 case CREATE_FILE:
2596 case TRUNCATE_FILE:
2597 break;
2598
2599 case CREATE_SYMLINK:
2600 if (!i.argument) {
2601 i.argument = strappend("/usr/share/factory/", i.path);
2602 if (!i.argument)
2603 return log_oom();
2604 }
2605 break;
2606
2607 case WRITE_FILE:
2608 if (!i.argument) {
2609 *invalid_config = true;
2610 log_error("[%s:%u] Write file requires argument.", fname, line);
2611 return -EBADMSG;
2612 }
2613 break;
2614
2615 case COPY_FILES:
2616 if (!i.argument) {
2617 i.argument = strappend("/usr/share/factory/", i.path);
2618 if (!i.argument)
2619 return log_oom();
2620 } else if (!path_is_absolute(i.argument)) {
2621 *invalid_config = true;
2622 log_error("[%s:%u] Source path is not absolute.", fname, line);
2623 return -EBADMSG;
2624 }
2625
2626 path_simplify(i.argument, false);
2627 break;
2628
2629 case CREATE_CHAR_DEVICE:
2630 case CREATE_BLOCK_DEVICE: {
2631 unsigned major, minor;
2632
2633 if (!i.argument) {
2634 *invalid_config = true;
2635 log_error("[%s:%u] Device file requires argument.", fname, line);
2636 return -EBADMSG;
2637 }
2638
2639 if (sscanf(i.argument, "%u:%u", &major, &minor) != 2) {
2640 *invalid_config = true;
2641 log_error("[%s:%u] Can't parse device file major/minor '%s'.", fname, line, i.argument);
2642 return -EBADMSG;
2643 }
2644
2645 i.major_minor = makedev(major, minor);
2646 break;
2647 }
2648
2649 case SET_XATTR:
2650 case RECURSIVE_SET_XATTR:
2651 if (!i.argument) {
2652 *invalid_config = true;
2653 log_error("[%s:%u] Set extended attribute requires argument.", fname, line);
2654 return -EBADMSG;
2655 }
2656 r = parse_xattrs_from_arg(&i);
2657 if (r < 0)
2658 return r;
2659 break;
2660
2661 case SET_ACL:
2662 case RECURSIVE_SET_ACL:
2663 if (!i.argument) {
2664 *invalid_config = true;
2665 log_error("[%s:%u] Set ACLs requires argument.", fname, line);
2666 return -EBADMSG;
2667 }
2668 r = parse_acls_from_arg(&i);
2669 if (r < 0)
2670 return r;
2671 break;
2672
2673 case SET_ATTRIBUTE:
2674 case RECURSIVE_SET_ATTRIBUTE:
2675 if (!i.argument) {
2676 *invalid_config = true;
2677 log_error("[%s:%u] Set file attribute requires argument.", fname, line);
2678 return -EBADMSG;
2679 }
2680 r = parse_attribute_from_arg(&i);
2681 if (IN_SET(r, -EINVAL, -EBADSLT))
2682 *invalid_config = true;
2683 if (r < 0)
2684 return r;
2685 break;
2686
2687 default:
2688 log_error("[%s:%u] Unknown command type '%c'.", fname, line, (char) i.type);
2689 *invalid_config = true;
2690 return -EBADMSG;
2691 }
2692
2693 if (!path_is_absolute(i.path)) {
2694 log_error("[%s:%u] Path '%s' not absolute.", fname, line, i.path);
2695 *invalid_config = true;
2696 return -EBADMSG;
2697 }
2698
2699 path_simplify(i.path, false);
2700
2701 if (!should_include_path(i.path))
2702 return 0;
2703
2704 r = specifier_expansion_from_arg(&i);
2705 if (r == -ENXIO)
2706 return log_unresolvable_specifier(fname, line);
2707 if (r < 0) {
2708 if (IN_SET(r, -EINVAL, -EBADSLT))
2709 *invalid_config = true;
2710 return log_error_errno(r, "[%s:%u] Failed to substitute specifiers in argument: %m",
2711 fname, line);
2712 }
2713
2714 if (arg_root) {
2715 char *p;
2716
2717 p = prefix_root(arg_root, i.path);
2718 if (!p)
2719 return log_oom();
2720
2721 free(i.path);
2722 i.path = p;
2723 }
2724
2725 if (!isempty(user) && !streq(user, "-")) {
2726 const char *u = user;
2727
2728 r = get_user_creds(&u, &i.uid, NULL, NULL, NULL);
2729 if (r < 0) {
2730 *invalid_config = true;
2731 return log_error_errno(r, "[%s:%u] Unknown user '%s'.", fname, line, user);
2732 }
2733
2734 i.uid_set = true;
2735 }
2736
2737 if (!isempty(group) && !streq(group, "-")) {
2738 const char *g = group;
2739
2740 r = get_group_creds(&g, &i.gid);
2741 if (r < 0) {
2742 *invalid_config = true;
2743 log_error("[%s:%u] Unknown group '%s'.", fname, line, group);
2744 return r;
2745 }
2746
2747 i.gid_set = true;
2748 }
2749
2750 if (!isempty(mode) && !streq(mode, "-")) {
2751 const char *mm = mode;
2752 unsigned m;
2753
2754 if (*mm == '~') {
2755 i.mask_perms = true;
2756 mm++;
2757 }
2758
2759 if (parse_mode(mm, &m) < 0) {
2760 *invalid_config = true;
2761 log_error("[%s:%u] Invalid mode '%s'.", fname, line, mode);
2762 return -EBADMSG;
2763 }
2764
2765 i.mode = m;
2766 i.mode_set = true;
2767 } else
2768 i.mode = IN_SET(i.type, CREATE_DIRECTORY, TRUNCATE_DIRECTORY, CREATE_SUBVOLUME, CREATE_SUBVOLUME_INHERIT_QUOTA, CREATE_SUBVOLUME_NEW_QUOTA) ? 0755 : 0644;
2769
2770 if (!isempty(age) && !streq(age, "-")) {
2771 const char *a = age;
2772
2773 if (*a == '~') {
2774 i.keep_first_level = true;
2775 a++;
2776 }
2777
2778 if (parse_sec(a, &i.age) < 0) {
2779 *invalid_config = true;
2780 log_error("[%s:%u] Invalid age '%s'.", fname, line, age);
2781 return -EBADMSG;
2782 }
2783
2784 i.age_set = true;
2785 }
2786
2787 h = needs_glob(i.type) ? globs : items;
2788
2789 existing = ordered_hashmap_get(h, i.path);
2790 if (existing) {
2791 unsigned n;
2792
2793 for (n = 0; n < existing->count; n++) {
2794 if (!item_compatible(existing->items + n, &i)) {
2795 log_notice("[%s:%u] Duplicate line for path \"%s\", ignoring.",
2796 fname, line, i.path);
2797 return 0;
2798 }
2799 }
2800 } else {
2801 existing = new0(ItemArray, 1);
2802 if (!existing)
2803 return log_oom();
2804
2805 r = ordered_hashmap_put(h, i.path, existing);
2806 if (r < 0)
2807 return log_oom();
2808 }
2809
2810 if (!GREEDY_REALLOC(existing->items, existing->size, existing->count + 1))
2811 return log_oom();
2812
2813 memcpy(existing->items + existing->count++, &i, sizeof(i));
2814
2815 /* Sort item array, to enforce stable ordering of application */
2816 qsort_safe(existing->items, existing->count, sizeof(Item), item_compare);
2817
2818 zero(i);
2819 return 0;
2820 }
2821
2822 static int cat_config(char **config_dirs, char **args) {
2823 _cleanup_strv_free_ char **files = NULL;
2824 int r;
2825
2826 r = conf_files_list_with_replacement(arg_root, config_dirs, arg_replace, &files, NULL);
2827 if (r < 0)
2828 return r;
2829
2830 return cat_files(NULL, files, 0);
2831 }
2832
2833 static void help(void) {
2834 printf("%s [OPTIONS...] [CONFIGURATION FILE...]\n\n"
2835 "Creates, deletes and cleans up volatile and temporary files and directories.\n\n"
2836 " -h --help Show this help\n"
2837 " --user Execute user configuration\n"
2838 " --version Show package version\n"
2839 " --cat-config Show configuration files\n"
2840 " --create Create marked files/directories\n"
2841 " --clean Clean up marked directories\n"
2842 " --remove Remove marked files/directories\n"
2843 " --boot Execute actions only safe at boot\n"
2844 " --prefix=PATH Only apply rules with the specified prefix\n"
2845 " --exclude-prefix=PATH Ignore rules with the specified prefix\n"
2846 " --root=PATH Operate on an alternate filesystem root\n"
2847 " --replace=PATH Treat arguments as replacement for PATH\n"
2848 " --no-pager Do not pipe output into a pager\n"
2849 , program_invocation_short_name);
2850 }
2851
2852 static int parse_argv(int argc, char *argv[]) {
2853
2854 enum {
2855 ARG_VERSION = 0x100,
2856 ARG_CAT_CONFIG,
2857 ARG_USER,
2858 ARG_CREATE,
2859 ARG_CLEAN,
2860 ARG_REMOVE,
2861 ARG_BOOT,
2862 ARG_PREFIX,
2863 ARG_EXCLUDE_PREFIX,
2864 ARG_ROOT,
2865 ARG_REPLACE,
2866 ARG_NO_PAGER,
2867 };
2868
2869 static const struct option options[] = {
2870 { "help", no_argument, NULL, 'h' },
2871 { "user", no_argument, NULL, ARG_USER },
2872 { "version", no_argument, NULL, ARG_VERSION },
2873 { "cat-config", no_argument, NULL, ARG_CAT_CONFIG },
2874 { "create", no_argument, NULL, ARG_CREATE },
2875 { "clean", no_argument, NULL, ARG_CLEAN },
2876 { "remove", no_argument, NULL, ARG_REMOVE },
2877 { "boot", no_argument, NULL, ARG_BOOT },
2878 { "prefix", required_argument, NULL, ARG_PREFIX },
2879 { "exclude-prefix", required_argument, NULL, ARG_EXCLUDE_PREFIX },
2880 { "root", required_argument, NULL, ARG_ROOT },
2881 { "replace", required_argument, NULL, ARG_REPLACE },
2882 { "no-pager", no_argument, NULL, ARG_NO_PAGER },
2883 {}
2884 };
2885
2886 int c, r;
2887
2888 assert(argc >= 0);
2889 assert(argv);
2890
2891 while ((c = getopt_long(argc, argv, "h", options, NULL)) >= 0)
2892
2893 switch (c) {
2894
2895 case 'h':
2896 help();
2897 return 0;
2898
2899 case ARG_VERSION:
2900 return version();
2901
2902 case ARG_CAT_CONFIG:
2903 arg_cat_config = true;
2904 break;
2905
2906 case ARG_USER:
2907 arg_user = true;
2908 break;
2909
2910 case ARG_CREATE:
2911 arg_create = true;
2912 break;
2913
2914 case ARG_CLEAN:
2915 arg_clean = true;
2916 break;
2917
2918 case ARG_REMOVE:
2919 arg_remove = true;
2920 break;
2921
2922 case ARG_BOOT:
2923 arg_boot = true;
2924 break;
2925
2926 case ARG_PREFIX:
2927 if (strv_push(&arg_include_prefixes, optarg) < 0)
2928 return log_oom();
2929 break;
2930
2931 case ARG_EXCLUDE_PREFIX:
2932 if (strv_push(&arg_exclude_prefixes, optarg) < 0)
2933 return log_oom();
2934 break;
2935
2936 case ARG_ROOT:
2937 r = parse_path_argument_and_warn(optarg, true, &arg_root);
2938 if (r < 0)
2939 return r;
2940 break;
2941
2942 case ARG_REPLACE:
2943 if (!path_is_absolute(optarg) ||
2944 !endswith(optarg, ".conf")) {
2945 log_error("The argument to --replace= must an absolute path to a config file");
2946 return -EINVAL;
2947 }
2948
2949 arg_replace = optarg;
2950 break;
2951
2952 case ARG_NO_PAGER:
2953 arg_no_pager = true;
2954 break;
2955
2956 case '?':
2957 return -EINVAL;
2958
2959 default:
2960 assert_not_reached("Unhandled option");
2961 }
2962
2963 if (!arg_clean && !arg_create && !arg_remove && !arg_cat_config) {
2964 log_error("You need to specify at least one of --clean, --create or --remove.");
2965 return -EINVAL;
2966 }
2967
2968 if (arg_replace && arg_cat_config) {
2969 log_error("Option --replace= is not supported with --cat-config");
2970 return -EINVAL;
2971 }
2972
2973 if (arg_replace && optind >= argc) {
2974 log_error("When --replace= is given, some configuration items must be specified");
2975 return -EINVAL;
2976 }
2977
2978 return 1;
2979 }
2980
2981 static int read_config_file(char **config_dirs, const char *fn, bool ignore_enoent, bool *invalid_config) {
2982 _cleanup_fclose_ FILE *_f = NULL;
2983 FILE *f;
2984 char line[LINE_MAX];
2985 Iterator iterator;
2986 unsigned v = 0;
2987 Item *i;
2988 int r = 0;
2989
2990 assert(fn);
2991
2992 if (streq(fn, "-")) {
2993 log_debug("Reading config from stdin…");
2994 fn = "<stdin>";
2995 f = stdin;
2996 } else {
2997 r = search_and_fopen(fn, "re", arg_root, (const char**) config_dirs, &_f);
2998 if (r < 0) {
2999 if (ignore_enoent && r == -ENOENT) {
3000 log_debug_errno(r, "Failed to open \"%s\", ignoring: %m", fn);
3001 return 0;
3002 }
3003
3004 return log_error_errno(r, "Failed to open '%s': %m", fn);
3005 }
3006 log_debug("Reading config file \"%s\"…", fn);
3007 f = _f;
3008 }
3009
3010 FOREACH_LINE(line, f, break) {
3011 char *l;
3012 int k;
3013 bool invalid_line = false;
3014
3015 v++;
3016
3017 l = strstrip(line);
3018 if (IN_SET(*l, 0, '#'))
3019 continue;
3020
3021 k = parse_line(fn, v, l, &invalid_line);
3022 if (k < 0) {
3023 if (invalid_line)
3024 /* Allow reporting with a special code if the caller requested this */
3025 *invalid_config = true;
3026 else if (r == 0)
3027 /* The first error becomes our return value */
3028 r = k;
3029 }
3030 }
3031
3032 /* we have to determine age parameter for each entry of type X */
3033 ORDERED_HASHMAP_FOREACH(i, globs, iterator) {
3034 Iterator iter;
3035 Item *j, *candidate_item = NULL;
3036
3037 if (i->type != IGNORE_DIRECTORY_PATH)
3038 continue;
3039
3040 ORDERED_HASHMAP_FOREACH(j, items, iter) {
3041 if (!IN_SET(j->type, CREATE_DIRECTORY, TRUNCATE_DIRECTORY, CREATE_SUBVOLUME, CREATE_SUBVOLUME_INHERIT_QUOTA, CREATE_SUBVOLUME_NEW_QUOTA))
3042 continue;
3043
3044 if (path_equal(j->path, i->path)) {
3045 candidate_item = j;
3046 break;
3047 }
3048
3049 if ((!candidate_item && path_startswith(i->path, j->path)) ||
3050 (candidate_item && path_startswith(j->path, candidate_item->path) && (fnmatch(i->path, j->path, FNM_PATHNAME | FNM_PERIOD) == 0)))
3051 candidate_item = j;
3052 }
3053
3054 if (candidate_item && candidate_item->age_set) {
3055 i->age = candidate_item->age;
3056 i->age_set = true;
3057 }
3058 }
3059
3060 if (ferror(f)) {
3061 log_error_errno(errno, "Failed to read from file %s: %m", fn);
3062 if (r == 0)
3063 r = -EIO;
3064 }
3065
3066 return r;
3067 }
3068
3069 static int parse_arguments(char **config_dirs, char **args, bool *invalid_config) {
3070 char **arg;
3071 int r;
3072
3073 STRV_FOREACH(arg, args) {
3074 r = read_config_file(config_dirs, *arg, false, invalid_config);
3075 if (r < 0)
3076 return r;
3077 }
3078
3079 return 0;
3080 }
3081
3082 static int read_config_files(char **config_dirs, char **args, bool *invalid_config) {
3083 _cleanup_strv_free_ char **files = NULL;
3084 _cleanup_free_ char *p = NULL;
3085 char **f;
3086 int r;
3087
3088 r = conf_files_list_with_replacement(arg_root, config_dirs, arg_replace, &files, &p);
3089 if (r < 0)
3090 return r;
3091
3092 STRV_FOREACH(f, files)
3093 if (p && path_equal(*f, p)) {
3094 log_debug("Parsing arguments at position \"%s\"…", *f);
3095
3096 r = parse_arguments(config_dirs, args, invalid_config);
3097 if (r < 0)
3098 return r;
3099 } else
3100 /* Just warn, ignore result otherwise.
3101 * read_config_file() has some debug output, so no need to print anything. */
3102 (void) read_config_file(config_dirs, *f, true, invalid_config);
3103
3104 return 0;
3105 }
3106
3107 int main(int argc, char *argv[]) {
3108 int r, k, r_process = 0;
3109 ItemArray *a;
3110 Iterator iterator;
3111 _cleanup_strv_free_ char **config_dirs = NULL;
3112 bool invalid_config = false;
3113
3114 r = parse_argv(argc, argv);
3115 if (r <= 0)
3116 goto finish;
3117
3118 log_set_target(LOG_TARGET_AUTO);
3119 log_parse_environment();
3120 log_open();
3121
3122 if (arg_user) {
3123 r = user_config_paths(&config_dirs);
3124 if (r < 0) {
3125 log_error_errno(r, "Failed to initialize configuration directory list: %m");
3126 goto finish;
3127 }
3128 } else {
3129 config_dirs = strv_split_nulstr(CONF_PATHS_NULSTR("tmpfiles.d"));
3130 if (!config_dirs) {
3131 r = log_oom();
3132 goto finish;
3133 }
3134 }
3135
3136 if (DEBUG_LOGGING) {
3137 _cleanup_free_ char *t = NULL;
3138
3139 t = strv_join(config_dirs, "\n\t");
3140 if (t)
3141 log_debug("Looking for configuration files in (higher priority first):\n\t%s", t);
3142 }
3143
3144 if (arg_cat_config) {
3145 (void) pager_open(arg_no_pager, false);
3146
3147 r = cat_config(config_dirs, argv + optind);
3148 goto finish;
3149 }
3150
3151 umask(0022);
3152
3153 mac_selinux_init();
3154
3155 items = ordered_hashmap_new(&string_hash_ops);
3156 globs = ordered_hashmap_new(&string_hash_ops);
3157
3158 if (!items || !globs) {
3159 r = log_oom();
3160 goto finish;
3161 }
3162
3163 /* If command line arguments are specified along with --replace, read all
3164 * configuration files and insert the positional arguments at the specified
3165 * place. Otherwise, if command line arguments are specified, execute just
3166 * them, and finally, without --replace= or any positional arguments, just
3167 * read configuration and execute it.
3168 */
3169 if (arg_replace || optind >= argc)
3170 r = read_config_files(config_dirs, argv + optind, &invalid_config);
3171 else
3172 r = parse_arguments(config_dirs, argv + optind, &invalid_config);
3173 if (r < 0)
3174 goto finish;
3175
3176 /* The non-globbing ones usually create things, hence we apply
3177 * them first */
3178 ORDERED_HASHMAP_FOREACH(a, items, iterator) {
3179 k = process_item_array(a);
3180 if (k < 0 && r_process == 0)
3181 r_process = k;
3182 }
3183
3184 /* The globbing ones usually alter things, hence we apply them
3185 * second. */
3186 ORDERED_HASHMAP_FOREACH(a, globs, iterator) {
3187 k = process_item_array(a);
3188 if (k < 0 && r_process == 0)
3189 r_process = k;
3190 }
3191
3192 finish:
3193 pager_close();
3194
3195 ordered_hashmap_free_with_destructor(items, item_array_free);
3196 ordered_hashmap_free_with_destructor(globs, item_array_free);
3197
3198 free(arg_include_prefixes);
3199 free(arg_exclude_prefixes);
3200 free(arg_root);
3201
3202 set_free_free(unix_sockets);
3203
3204 mac_selinux_finish();
3205
3206 if (r < 0 || ERRNO_IS_RESOURCE(-r_process))
3207 return EXIT_FAILURE;
3208 else if (invalid_config)
3209 return EX_DATAERR;
3210 else if (r_process < 0)
3211 return EX_CANTCREAT;
3212 else
3213 return EXIT_SUCCESS;
3214 }
Unnamed repository; edit this file 'description' to name the repository.