]> git.ipfire.org Git - thirdparty/systemd.git/blob - src/tmpfiles/tmpfiles.c
projects / thirdparty / systemd.git / blob
? search:


84e104f9b5569a5e8466afa94fb93b51cda3d6dd
[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/file.h>
16 #include <sys/stat.h>
17 #include <sys/xattr.h>
18 #include <sysexits.h>
19 #include <time.h>
20 #include <unistd.h>
21
22 #include "sd-path.h"
23
24 #include "acl-util.h"
25 #include "alloc-util.h"
26 #include "btrfs-util.h"
27 #include "capability-util.h"
28 #include "chattr-util.h"
29 #include "conf-files.h"
30 #include "copy.h"
31 #include "def.h"
32 #include "dirent-util.h"
33 #include "escape.h"
34 #include "fd-util.h"
35 #include "fileio.h"
36 #include "format-util.h"
37 #include "fs-util.h"
38 #include "glob-util.h"
39 #include "io-util.h"
40 #include "label.h"
41 #include "log.h"
42 #include "macro.h"
43 #include "main-func.h"
44 #include "missing.h"
45 #include "mkdir.h"
46 #include "mountpoint-util.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',
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 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_replace = NULL;
172
173 #define MAX_DEPTH 256
174
175 static OrderedHashmap *items = NULL, *globs = NULL;
176 static Set *unix_sockets = NULL;
177
178 STATIC_DESTRUCTOR_REGISTER(items, ordered_hashmap_freep);
179 STATIC_DESTRUCTOR_REGISTER(globs, ordered_hashmap_freep);
180 STATIC_DESTRUCTOR_REGISTER(unix_sockets, set_free_freep);
181 STATIC_DESTRUCTOR_REGISTER(arg_include_prefixes, freep);
182 STATIC_DESTRUCTOR_REGISTER(arg_exclude_prefixes, freep);
183 STATIC_DESTRUCTOR_REGISTER(arg_root, freep);
184
185 static int specifier_machine_id_safe(char specifier, const void *data, const void *userdata, char **ret);
186 static int specifier_directory(char specifier, const void *data, const void *userdata, char **ret);
187
188 static const Specifier specifier_table[] = {
189 { 'm', specifier_machine_id_safe, NULL },
190 { 'b', specifier_boot_id, NULL },
191 { 'H', specifier_host_name, NULL },
192 { 'v', specifier_kernel_release, NULL },
193
194 { 'g', specifier_group_name, NULL },
195 { 'G', specifier_group_id, NULL },
196 { 'U', specifier_user_id, NULL },
197 { 'u', specifier_user_name, NULL },
198 { 'h', specifier_user_home, NULL },
199
200 { 't', specifier_directory, UINT_TO_PTR(DIRECTORY_RUNTIME) },
201 { 'S', specifier_directory, UINT_TO_PTR(DIRECTORY_STATE) },
202 { 'C', specifier_directory, UINT_TO_PTR(DIRECTORY_CACHE) },
203 { 'L', specifier_directory, UINT_TO_PTR(DIRECTORY_LOGS) },
204 { 'T', specifier_tmp_dir, NULL },
205 { 'V', specifier_var_tmp_dir, NULL },
206 {}
207 };
208
209 static int specifier_machine_id_safe(char specifier, const void *data, const void *userdata, char **ret) {
210 int r;
211
212 /* If /etc/machine_id is missing or empty (e.g. in a chroot environment)
213 * return a recognizable error so that the caller can skip the rule
214 * gracefully. */
215
216 r = specifier_machine_id(specifier, data, userdata, ret);
217 if (IN_SET(r, -ENOENT, -ENOMEDIUM))
218 return -ENXIO;
219
220 return r;
221 }
222
223 static int specifier_directory(char specifier, const void *data, const void *userdata, char **ret) {
224 struct table_entry {
225 uint64_t type;
226 const char *suffix;
227 };
228
229 static const struct table_entry paths_system[] = {
230 [DIRECTORY_RUNTIME] = { SD_PATH_SYSTEM_RUNTIME },
231 [DIRECTORY_STATE] = { SD_PATH_SYSTEM_STATE_PRIVATE },
232 [DIRECTORY_CACHE] = { SD_PATH_SYSTEM_STATE_CACHE },
233 [DIRECTORY_LOGS] = { SD_PATH_SYSTEM_STATE_LOGS },
234 };
235
236 static const struct table_entry paths_user[] = {
237 [DIRECTORY_RUNTIME] = { SD_PATH_USER_RUNTIME },
238 [DIRECTORY_STATE] = { SD_PATH_USER_CONFIGURATION },
239 [DIRECTORY_CACHE] = { SD_PATH_USER_STATE_CACHE },
240 [DIRECTORY_LOGS] = { SD_PATH_USER_CONFIGURATION, "log" },
241 };
242
243 unsigned i;
244 const struct table_entry *paths;
245
246 assert_cc(ELEMENTSOF(paths_system) == ELEMENTSOF(paths_user));
247 paths = arg_user ? paths_user : paths_system;
248
249 i = PTR_TO_UINT(data);
250 assert(i < ELEMENTSOF(paths_system));
251
252 return sd_path_home(paths[i].type, paths[i].suffix, ret);
253 }
254
255 static int log_unresolvable_specifier(const char *filename, unsigned line) {
256 static bool notified = false;
257
258 /* In system mode, this is called when /etc is not fully initialized (e.g.
259 * in a chroot environment) where some specifiers are unresolvable. In user
260 * mode, this is called when some variables are not defined. These cases are
261 * not considered as an error so log at LOG_NOTICE only for the first time
262 * and then downgrade this to LOG_DEBUG for the rest. */
263
264 log_full(notified ? LOG_DEBUG : LOG_NOTICE,
265 "[%s:%u] Failed to resolve specifier: %s, skipping",
266 filename, line,
267 arg_user ? "Required $XDG_... variable not defined" : "uninitialized /etc detected");
268
269 if (!notified)
270 log_notice("All rules containing unresolvable specifiers will be skipped.");
271
272 notified = true;
273 return 0;
274 }
275
276 static int user_config_paths(char*** ret) {
277 _cleanup_strv_free_ char **config_dirs = NULL, **data_dirs = NULL;
278 _cleanup_free_ char *persistent_config = NULL, *runtime_config = NULL, *data_home = NULL;
279 _cleanup_strv_free_ char **res = NULL;
280 int r;
281
282 r = xdg_user_dirs(&config_dirs, &data_dirs);
283 if (r < 0)
284 return r;
285
286 r = xdg_user_config_dir(&persistent_config, "/user-tmpfiles.d");
287 if (r < 0 && r != -ENXIO)
288 return r;
289
290 r = xdg_user_runtime_dir(&runtime_config, "/user-tmpfiles.d");
291 if (r < 0 && r != -ENXIO)
292 return r;
293
294 r = xdg_user_data_dir(&data_home, "/user-tmpfiles.d");
295 if (r < 0 && r != -ENXIO)
296 return r;
297
298 r = strv_extend_strv_concat(&res, config_dirs, "/user-tmpfiles.d");
299 if (r < 0)
300 return r;
301
302 r = strv_extend(&res, persistent_config);
303 if (r < 0)
304 return r;
305
306 r = strv_extend(&res, runtime_config);
307 if (r < 0)
308 return r;
309
310 r = strv_extend(&res, data_home);
311 if (r < 0)
312 return r;
313
314 r = strv_extend_strv_concat(&res, data_dirs, "/user-tmpfiles.d");
315 if (r < 0)
316 return r;
317
318 r = path_strv_make_absolute_cwd(res);
319 if (r < 0)
320 return r;
321
322 *ret = TAKE_PTR(res);
323 return 0;
324 }
325
326 static bool needs_glob(ItemType t) {
327 return IN_SET(t,
328 WRITE_FILE,
329 IGNORE_PATH,
330 IGNORE_DIRECTORY_PATH,
331 REMOVE_PATH,
332 RECURSIVE_REMOVE_PATH,
333 EMPTY_DIRECTORY,
334 ADJUST_MODE,
335 RELABEL_PATH,
336 RECURSIVE_RELABEL_PATH,
337 SET_XATTR,
338 RECURSIVE_SET_XATTR,
339 SET_ACL,
340 RECURSIVE_SET_ACL,
341 SET_ATTRIBUTE,
342 RECURSIVE_SET_ATTRIBUTE);
343 }
344
345 static bool takes_ownership(ItemType t) {
346 return IN_SET(t,
347 CREATE_FILE,
348 TRUNCATE_FILE,
349 CREATE_DIRECTORY,
350 EMPTY_DIRECTORY,
351 TRUNCATE_DIRECTORY,
352 CREATE_SUBVOLUME,
353 CREATE_SUBVOLUME_INHERIT_QUOTA,
354 CREATE_SUBVOLUME_NEW_QUOTA,
355 CREATE_FIFO,
356 CREATE_SYMLINK,
357 CREATE_CHAR_DEVICE,
358 CREATE_BLOCK_DEVICE,
359 COPY_FILES,
360 WRITE_FILE,
361 IGNORE_PATH,
362 IGNORE_DIRECTORY_PATH,
363 REMOVE_PATH,
364 RECURSIVE_REMOVE_PATH);
365 }
366
367 static struct Item* find_glob(OrderedHashmap *h, const char *match) {
368 ItemArray *j;
369 Iterator i;
370
371 ORDERED_HASHMAP_FOREACH(j, h, i) {
372 size_t n;
373
374 for (n = 0; n < j->n_items; n++) {
375 Item *item = j->items + n;
376
377 if (fnmatch(item->path, match, FNM_PATHNAME|FNM_PERIOD) == 0)
378 return item;
379 }
380 }
381
382 return NULL;
383 }
384
385 static int load_unix_sockets(void) {
386 _cleanup_set_free_free_ Set *sockets = NULL;
387 _cleanup_fclose_ FILE *f = NULL;
388 int r;
389
390 if (unix_sockets)
391 return 0;
392
393 /* We maintain a cache of the sockets we found in /proc/net/unix to speed things up a little. */
394
395 sockets = set_new(&path_hash_ops);
396 if (!sockets)
397 return log_oom();
398
399 f = fopen("/proc/net/unix", "re");
400 if (!f)
401 return log_full_errno(errno == ENOENT ? LOG_DEBUG : LOG_WARNING, errno,
402 "Failed to open /proc/net/unix, ignoring: %m");
403
404 /* Skip header */
405 r = read_line(f, LONG_LINE_MAX, NULL);
406 if (r < 0)
407 return log_warning_errno(r, "Failed to skip /proc/net/unix header line: %m");
408 if (r == 0)
409 return log_warning_errno(SYNTHETIC_ERRNO(EIO), "Premature end of file reading /proc/net/unix.");
410
411 for (;;) {
412 _cleanup_free_ char *line = NULL, *s = NULL;
413 char *p;
414
415 r = read_line(f, LONG_LINE_MAX, &line);
416 if (r < 0)
417 return log_warning_errno(r, "Failed to read /proc/net/unix line, ignoring: %m");
418 if (r == 0) /* EOF */
419 break;
420
421 p = strchr(line, ':');
422 if (!p)
423 continue;
424
425 if (strlen(p) < 37)
426 continue;
427
428 p += 37;
429 p += strspn(p, WHITESPACE);
430 p += strcspn(p, WHITESPACE); /* skip one more word */
431 p += strspn(p, WHITESPACE);
432
433 if (*p != '/')
434 continue;
435
436 s = strdup(p);
437 if (!s)
438 return log_oom();
439
440 path_simplify(s, false);
441
442 r = set_consume(sockets, s);
443 if (r == -EEXIST)
444 continue;
445 if (r < 0)
446 return log_warning_errno(r, "Failed to add AF_UNIX socket to set, ignoring: %m");
447
448 TAKE_PTR(s);
449 }
450
451 unix_sockets = TAKE_PTR(sockets);
452 return 1;
453 }
454
455 static bool unix_socket_alive(const char *fn) {
456 assert(fn);
457
458 if (load_unix_sockets() < 0)
459 return true; /* We don't know, so assume yes */
460
461 return !!set_get(unix_sockets, (char*) fn);
462 }
463
464 static int dir_is_mount_point(DIR *d, const char *subdir) {
465
466 int mount_id_parent, mount_id;
467 int r_p, r;
468
469 r_p = name_to_handle_at_loop(dirfd(d), ".", NULL, &mount_id_parent, 0);
470 if (r_p < 0)
471 r_p = -errno;
472
473 r = name_to_handle_at_loop(dirfd(d), subdir, NULL, &mount_id, 0);
474 if (r < 0)
475 r = -errno;
476
477 /* got no handle; make no assumptions, return error */
478 if (r_p < 0 && r < 0)
479 return r_p;
480
481 /* got both handles; if they differ, it is a mount point */
482 if (r_p >= 0 && r >= 0)
483 return mount_id_parent != mount_id;
484
485 /* got only one handle; assume different mount points if one
486 * of both queries was not supported by the filesystem */
487 if (IN_SET(r_p, -ENOSYS, -EOPNOTSUPP) || IN_SET(r, -ENOSYS, -EOPNOTSUPP))
488 return true;
489
490 /* return error */
491 if (r_p < 0)
492 return r_p;
493 return r;
494 }
495
496 static DIR* xopendirat_nomod(int dirfd, const char *path) {
497 DIR *dir;
498
499 dir = xopendirat(dirfd, path, O_NOFOLLOW|O_NOATIME);
500 if (dir)
501 return dir;
502
503 log_debug_errno(errno, "Cannot open %sdirectory \"%s\": %m", dirfd == AT_FDCWD ? "" : "sub", path);
504 if (errno != EPERM)
505 return NULL;
506
507 dir = xopendirat(dirfd, path, O_NOFOLLOW);
508 if (!dir)
509 log_debug_errno(errno, "Cannot open %sdirectory \"%s\": %m", dirfd == AT_FDCWD ? "" : "sub", path);
510
511 return dir;
512 }
513
514 static DIR* opendir_nomod(const char *path) {
515 return xopendirat_nomod(AT_FDCWD, path);
516 }
517
518 static int dir_cleanup(
519 Item *i,
520 const char *p,
521 DIR *d,
522 const struct stat *ds,
523 usec_t cutoff,
524 dev_t rootdev,
525 bool mountpoint,
526 int maxdepth,
527 bool keep_this_level) {
528
529 struct dirent *dent;
530 bool deleted = false;
531 int r = 0;
532
533 FOREACH_DIRENT_ALL(dent, d, break) {
534 struct stat s;
535 usec_t age;
536 _cleanup_free_ char *sub_path = NULL;
537
538 if (dot_or_dot_dot(dent->d_name))
539 continue;
540
541 if (fstatat(dirfd(d), dent->d_name, &s, AT_SYMLINK_NOFOLLOW) < 0) {
542 if (errno == ENOENT)
543 continue;
544
545 /* FUSE, NFS mounts, SELinux might return EACCES */
546 r = log_full_errno(errno == EACCES ? LOG_DEBUG : LOG_ERR, errno,
547 "stat(%s/%s) failed: %m", p, dent->d_name);
548 continue;
549 }
550
551 /* Stay on the same filesystem */
552 if (s.st_dev != rootdev) {
553 log_debug("Ignoring \"%s/%s\": different filesystem.", p, dent->d_name);
554 continue;
555 }
556
557 /* Try to detect bind mounts of the same filesystem instance; they
558 * do not differ in device major/minors. This type of query is not
559 * supported on all kernels or filesystem types though. */
560 if (S_ISDIR(s.st_mode) && dir_is_mount_point(d, dent->d_name) > 0) {
561 log_debug("Ignoring \"%s/%s\": different mount of the same filesystem.",
562 p, dent->d_name);
563 continue;
564 }
565
566 sub_path = strjoin(p, "/", dent->d_name);
567 if (!sub_path) {
568 r = log_oom();
569 goto finish;
570 }
571
572 /* Is there an item configured for this path? */
573 if (ordered_hashmap_get(items, sub_path)) {
574 log_debug("Ignoring \"%s\": a separate entry exists.", sub_path);
575 continue;
576 }
577
578 if (find_glob(globs, sub_path)) {
579 log_debug("Ignoring \"%s\": a separate glob exists.", sub_path);
580 continue;
581 }
582
583 if (S_ISDIR(s.st_mode)) {
584 _cleanup_closedir_ DIR *sub_dir = NULL;
585
586 if (mountpoint &&
587 streq(dent->d_name, "lost+found") &&
588 s.st_uid == 0) {
589 log_debug("Ignoring directory \"%s\".", sub_path);
590 continue;
591 }
592
593 if (maxdepth <= 0)
594 log_warning("Reached max depth on \"%s\".", sub_path);
595 else {
596 int q;
597
598 sub_dir = xopendirat_nomod(dirfd(d), dent->d_name);
599 if (!sub_dir) {
600 if (errno != ENOENT)
601 r = log_warning_errno(errno, "Opening directory \"%s\" failed, ignoring: %m", sub_path);
602
603 continue;
604 }
605
606 if (flock(dirfd(sub_dir), LOCK_EX|LOCK_NB) < 0) {
607 log_debug_errno(errno, "Couldn't acquire shared BSD lock on directory \"%s\", skipping: %m", p);
608 continue;
609 }
610
611 q = dir_cleanup(i, sub_path, sub_dir, &s, cutoff, rootdev, false, maxdepth-1, false);
612 if (q < 0)
613 r = q;
614 }
615
616 /* Note: if you are wondering why we don't support the sticky bit for excluding
617 * directories from cleaning like we do it for other file system objects: well, the
618 * sticky bit already has a meaning for directories, so we don't want to overload
619 * that. */
620
621 if (keep_this_level) {
622 log_debug("Keeping directory \"%s\".", sub_path);
623 continue;
624 }
625
626 /* Ignore ctime, we change it when deleting */
627 age = timespec_load(&s.st_mtim);
628 if (age >= cutoff) {
629 char a[FORMAT_TIMESTAMP_MAX];
630 /* Follows spelling in stat(1). */
631 log_debug("Directory \"%s\": modify time %s is too new.",
632 sub_path,
633 format_timestamp_us(a, sizeof(a), age));
634 continue;
635 }
636
637 age = timespec_load(&s.st_atim);
638 if (age >= cutoff) {
639 char a[FORMAT_TIMESTAMP_MAX];
640 log_debug("Directory \"%s\": access time %s is too new.",
641 sub_path,
642 format_timestamp_us(a, sizeof(a), age));
643 continue;
644 }
645
646 log_debug("Removing directory \"%s\".", sub_path);
647 if (unlinkat(dirfd(d), dent->d_name, AT_REMOVEDIR) < 0)
648 if (!IN_SET(errno, ENOENT, ENOTEMPTY))
649 r = log_warning_errno(errno, "Failed to remove directory \"%s\", ignoring: %m", sub_path);
650
651 } else {
652 /* Skip files for which the sticky bit is set. These are semantics we define, and are
653 * unknown elsewhere. See XDG_RUNTIME_DIR specification for details. */
654 if (s.st_mode & S_ISVTX) {
655 log_debug("Skipping \"%s\": sticky bit set.", sub_path);
656 continue;
657 }
658
659 if (mountpoint && S_ISREG(s.st_mode))
660 if (s.st_uid == 0 && STR_IN_SET(dent->d_name,
661 ".journal",
662 "aquota.user",
663 "aquota.group")) {
664 log_debug("Skipping \"%s\".", sub_path);
665 continue;
666 }
667
668 /* Ignore sockets that are listed in /proc/net/unix */
669 if (S_ISSOCK(s.st_mode) && unix_socket_alive(sub_path)) {
670 log_debug("Skipping \"%s\": live socket.", sub_path);
671 continue;
672 }
673
674 /* Ignore device nodes */
675 if (S_ISCHR(s.st_mode) || S_ISBLK(s.st_mode)) {
676 log_debug("Skipping \"%s\": a device.", sub_path);
677 continue;
678 }
679
680 /* Keep files on this level around if this is requested */
681 if (keep_this_level) {
682 log_debug("Keeping \"%s\".", sub_path);
683 continue;
684 }
685
686 age = timespec_load(&s.st_mtim);
687 if (age >= cutoff) {
688 char a[FORMAT_TIMESTAMP_MAX];
689 /* Follows spelling in stat(1). */
690 log_debug("File \"%s\": modify time %s is too new.",
691 sub_path,
692 format_timestamp_us(a, sizeof(a), age));
693 continue;
694 }
695
696 age = timespec_load(&s.st_atim);
697 if (age >= cutoff) {
698 char a[FORMAT_TIMESTAMP_MAX];
699 log_debug("File \"%s\": access time %s is too new.",
700 sub_path,
701 format_timestamp_us(a, sizeof(a), age));
702 continue;
703 }
704
705 age = timespec_load(&s.st_ctim);
706 if (age >= cutoff) {
707 char a[FORMAT_TIMESTAMP_MAX];
708 log_debug("File \"%s\": change time %s is too new.",
709 sub_path,
710 format_timestamp_us(a, sizeof(a), age));
711 continue;
712 }
713
714 log_debug("Removing \"%s\".", sub_path);
715 if (unlinkat(dirfd(d), dent->d_name, 0) < 0)
716 if (errno != ENOENT)
717 r = log_warning_errno(errno, "Failed to remove \"%s\", ignoring: %m", sub_path);
718
719 deleted = true;
720 }
721 }
722
723 finish:
724 if (deleted) {
725 char a[FORMAT_TIMESTAMP_MAX], b[FORMAT_TIMESTAMP_MAX];
726 usec_t age1, age2;
727
728 age1 = timespec_load(&ds->st_atim);
729 age2 = timespec_load(&ds->st_mtim);
730
731 log_debug("Restoring access and modification time on \"%s\": %s, %s",
732 p,
733 format_timestamp_us(a, sizeof(a), age1),
734 format_timestamp_us(b, sizeof(b), age2));
735
736 /* Restore original directory timestamps */
737 if (futimens(dirfd(d), (struct timespec[]) {
738 ds->st_atim,
739 ds->st_mtim }) < 0)
740 log_warning_errno(errno, "Failed to revert timestamps of '%s', ignoring: %m", p);
741 }
742
743 return r;
744 }
745
746 static bool dangerous_hardlinks(void) {
747 _cleanup_free_ char *value = NULL;
748 static int cached = -1;
749 int r;
750
751 /* Check whether the fs.protected_hardlinks sysctl is on. If we can't determine it we assume its off, as that's
752 * what the upstream default is. */
753
754 if (cached >= 0)
755 return cached;
756
757 r = read_one_line_file("/proc/sys/fs/protected_hardlinks", &value);
758 if (r < 0) {
759 log_debug_errno(r, "Failed to read fs.protected_hardlinks sysctl: %m");
760 return true;
761 }
762
763 r = parse_boolean(value);
764 if (r < 0) {
765 log_debug_errno(r, "Failed to parse fs.protected_hardlinks sysctl: %m");
766 return true;
767 }
768
769 cached = r == 0;
770 return cached;
771 }
772
773 static bool hardlink_vulnerable(const struct stat *st) {
774 assert(st);
775
776 return !S_ISDIR(st->st_mode) && st->st_nlink > 1 && dangerous_hardlinks();
777 }
778
779 static int fd_set_perms(Item *i, int fd, const char *path, const struct stat *st) {
780 struct stat stbuf;
781
782 assert(i);
783 assert(fd);
784 assert(path);
785
786 if (!i->mode_set && !i->uid_set && !i->gid_set)
787 goto shortcut;
788
789 if (!st) {
790 if (fstat(fd, &stbuf) < 0)
791 return log_error_errno(errno, "fstat(%s) failed: %m", path);
792 st = &stbuf;
793 }
794
795 if (hardlink_vulnerable(st))
796 return log_error_errno(SYNTHETIC_ERRNO(EPERM),
797 "Refusing to set permissions on hardlinked file %s while the fs.protected_hardlinks sysctl is turned off.",
798 path);
799
800 if (i->mode_set) {
801 if (S_ISLNK(st->st_mode))
802 log_debug("Skipping mode fix for symlink %s.", path);
803 else {
804 mode_t m = i->mode;
805
806 if (i->mask_perms) {
807 if (!(st->st_mode & 0111))
808 m &= ~0111;
809 if (!(st->st_mode & 0222))
810 m &= ~0222;
811 if (!(st->st_mode & 0444))
812 m &= ~0444;
813 if (!S_ISDIR(st->st_mode))
814 m &= ~07000; /* remove sticky/sgid/suid bit, unless directory */
815 }
816
817 if (m == (st->st_mode & 07777))
818 log_debug("\"%s\" has correct mode %o already.", path, st->st_mode);
819 else {
820 log_debug("Changing \"%s\" to mode %o.", path, m);
821 if (fchmod_opath(fd, m) < 0)
822 return log_error_errno(errno, "fchmod() of %s failed: %m", path);
823 }
824 }
825 }
826
827 if ((i->uid_set && i->uid != st->st_uid) ||
828 (i->gid_set && i->gid != st->st_gid)) {
829 log_debug("Changing \"%s\" to owner "UID_FMT":"GID_FMT,
830 path,
831 i->uid_set ? i->uid : UID_INVALID,
832 i->gid_set ? i->gid : GID_INVALID);
833
834 if (fchownat(fd,
835 "",
836 i->uid_set ? i->uid : UID_INVALID,
837 i->gid_set ? i->gid : GID_INVALID,
838 AT_EMPTY_PATH) < 0)
839 return log_error_errno(errno, "fchownat() of %s failed: %m", path);
840 }
841
842 shortcut:
843 return label_fix(path, 0);
844 }
845
846 static int path_open_parent_safe(const char *path) {
847 _cleanup_free_ char *dn = NULL;
848 int fd;
849
850 if (path_equal(path, "/") || !path_is_normalized(path))
851 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
852 "Failed to open parent of '%s': invalid path.",
853 path);
854
855 dn = dirname_malloc(path);
856 if (!dn)
857 return log_oom();
858
859 fd = chase_symlinks(dn, arg_root, CHASE_OPEN|CHASE_SAFE|CHASE_WARN, NULL);
860 if (fd < 0 && fd != -ENOLINK)
861 return log_error_errno(fd, "Failed to validate path %s: %m", path);
862
863 return fd;
864 }
865
866 static int path_open_safe(const char *path) {
867 int fd;
868
869 /* path_open_safe() returns a file descriptor opened with O_PATH after
870 * verifying that the path doesn't contain unsafe transitions, except
871 * for its final component as the function does not follow symlink. */
872
873 assert(path);
874
875 if (!path_is_normalized(path))
876 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
877 "Failed to open invalid path '%s'.",
878 path);
879
880 fd = chase_symlinks(path, arg_root, CHASE_OPEN|CHASE_SAFE|CHASE_WARN|CHASE_NOFOLLOW, NULL);
881 if (fd < 0 && fd != -ENOLINK)
882 return log_error_errno(fd, "Failed to validate path %s: %m", path);
883
884 return fd;
885 }
886
887 static int path_set_perms(Item *i, const char *path) {
888 _cleanup_close_ int fd = -1;
889
890 assert(i);
891 assert(path);
892
893 fd = path_open_safe(path);
894 if (fd < 0)
895 return fd;
896
897 return fd_set_perms(i, fd, path, NULL);
898 }
899
900 static int parse_xattrs_from_arg(Item *i) {
901 const char *p;
902 int r;
903
904 assert(i);
905 assert(i->argument);
906
907 p = i->argument;
908
909 for (;;) {
910 _cleanup_free_ char *name = NULL, *value = NULL, *xattr = NULL;
911
912 r = extract_first_word(&p, &xattr, NULL, EXTRACT_QUOTES|EXTRACT_CUNESCAPE);
913 if (r < 0)
914 log_warning_errno(r, "Failed to parse extended attribute '%s', ignoring: %m", p);
915 if (r <= 0)
916 break;
917
918 r = split_pair(xattr, "=", &name, &value);
919 if (r < 0) {
920 log_warning_errno(r, "Failed to parse extended attribute, ignoring: %s", xattr);
921 continue;
922 }
923
924 if (isempty(name) || isempty(value)) {
925 log_warning("Malformed extended attribute found, ignoring: %s", xattr);
926 continue;
927 }
928
929 if (strv_push_pair(&i->xattrs, name, value) < 0)
930 return log_oom();
931
932 name = value = NULL;
933 }
934
935 return 0;
936 }
937
938 static int fd_set_xattrs(Item *i, int fd, const char *path, const struct stat *st) {
939 char procfs_path[STRLEN("/proc/self/fd/") + DECIMAL_STR_MAX(int)];
940 char **name, **value;
941
942 assert(i);
943 assert(fd);
944 assert(path);
945
946 xsprintf(procfs_path, "/proc/self/fd/%i", fd);
947
948 STRV_FOREACH_PAIR(name, value, i->xattrs) {
949 log_debug("Setting extended attribute '%s=%s' on %s.", *name, *value, path);
950 if (setxattr(procfs_path, *name, *value, strlen(*value), 0) < 0)
951 return log_error_errno(errno, "Setting extended attribute %s=%s on %s failed: %m",
952 *name, *value, path);
953 }
954 return 0;
955 }
956
957 static int path_set_xattrs(Item *i, const char *path) {
958 _cleanup_close_ int fd = -1;
959
960 assert(i);
961 assert(path);
962
963 fd = path_open_safe(path);
964 if (fd < 0)
965 return fd;
966
967 return fd_set_xattrs(i, fd, path, NULL);
968 }
969
970 static int parse_acls_from_arg(Item *item) {
971 #if HAVE_ACL
972 int r;
973
974 assert(item);
975
976 /* If force (= modify) is set, we will not modify the acl
977 * afterwards, so the mask can be added now if necessary. */
978
979 r = parse_acl(item->argument, &item->acl_access, &item->acl_default, !item->force);
980 if (r < 0)
981 log_warning_errno(r, "Failed to parse ACL \"%s\": %m. Ignoring", item->argument);
982 #else
983 log_warning_errno(SYNTHETIC_ERRNO(ENOSYS), "ACLs are not supported. Ignoring");
984 #endif
985
986 return 0;
987 }
988
989 #if HAVE_ACL
990 static int path_set_acl(const char *path, const char *pretty, acl_type_t type, acl_t acl, bool modify) {
991 _cleanup_(acl_free_charpp) char *t = NULL;
992 _cleanup_(acl_freep) acl_t dup = NULL;
993 int r;
994
995 /* Returns 0 for success, positive error if already warned,
996 * negative error otherwise. */
997
998 if (modify) {
999 r = acls_for_file(path, type, acl, &dup);
1000 if (r < 0)
1001 return r;
1002
1003 r = calc_acl_mask_if_needed(&dup);
1004 if (r < 0)
1005 return r;
1006 } else {
1007 dup = acl_dup(acl);
1008 if (!dup)
1009 return -errno;
1010
1011 /* the mask was already added earlier if needed */
1012 }
1013
1014 r = add_base_acls_if_needed(&dup, path);
1015 if (r < 0)
1016 return r;
1017
1018 t = acl_to_any_text(dup, NULL, ',', TEXT_ABBREVIATE);
1019 log_debug("Setting %s ACL %s on %s.",
1020 type == ACL_TYPE_ACCESS ? "access" : "default",
1021 strna(t), pretty);
1022
1023 r = acl_set_file(path, type, dup);
1024 if (r < 0)
1025 /* Return positive to indicate we already warned */
1026 return -log_error_errno(errno,
1027 "Setting %s ACL \"%s\" on %s failed: %m",
1028 type == ACL_TYPE_ACCESS ? "access" : "default",
1029 strna(t), pretty);
1030
1031 return 0;
1032 }
1033 #endif
1034
1035 static int fd_set_acls(Item *item, int fd, const char *path, const struct stat *st) {
1036 int r = 0;
1037 #if HAVE_ACL
1038 char procfs_path[STRLEN("/proc/self/fd/") + DECIMAL_STR_MAX(int)];
1039 struct stat stbuf;
1040
1041 assert(item);
1042 assert(fd);
1043 assert(path);
1044
1045 if (!st) {
1046 if (fstat(fd, &stbuf) < 0)
1047 return log_error_errno(errno, "fstat(%s) failed: %m", path);
1048 st = &stbuf;
1049 }
1050
1051 if (hardlink_vulnerable(st))
1052 return log_error_errno(SYNTHETIC_ERRNO(EPERM),
1053 "Refusing to set ACLs on hardlinked file %s while the fs.protected_hardlinks sysctl is turned off.",
1054 path);
1055
1056 if (S_ISLNK(st->st_mode)) {
1057 log_debug("Skipping ACL fix for symlink %s.", path);
1058 return 0;
1059 }
1060
1061 xsprintf(procfs_path, "/proc/self/fd/%i", fd);
1062
1063 if (item->acl_access)
1064 r = path_set_acl(procfs_path, path, ACL_TYPE_ACCESS, item->acl_access, item->force);
1065
1066 /* set only default acls to folders */
1067 if (r == 0 && item->acl_default && S_ISDIR(st->st_mode))
1068 r = path_set_acl(procfs_path, path, ACL_TYPE_DEFAULT, item->acl_default, item->force);
1069
1070 if (r > 0)
1071 return -r; /* already warned */
1072 if (r == -EOPNOTSUPP) {
1073 log_debug_errno(r, "ACLs not supported by file system at %s", path);
1074 return 0;
1075 }
1076 if (r < 0)
1077 return log_error_errno(r, "ACL operation on \"%s\" failed: %m", path);
1078 #endif
1079 return r;
1080 }
1081
1082 static int path_set_acls(Item *item, const char *path) {
1083 int r = 0;
1084 #if HAVE_ACL
1085 _cleanup_close_ int fd = -1;
1086
1087 assert(item);
1088 assert(path);
1089
1090 fd = path_open_safe(path);
1091 if (fd < 0)
1092 return fd;
1093
1094 r = fd_set_acls(item, fd, path, NULL);
1095 #endif
1096 return r;
1097 }
1098
1099 static int parse_attribute_from_arg(Item *item) {
1100
1101 static const struct {
1102 char character;
1103 unsigned value;
1104 } attributes[] = {
1105 { 'A', FS_NOATIME_FL }, /* do not update atime */
1106 { 'S', FS_SYNC_FL }, /* Synchronous updates */
1107 { 'D', FS_DIRSYNC_FL }, /* dirsync behaviour (directories only) */
1108 { 'a', FS_APPEND_FL }, /* writes to file may only append */
1109 { 'c', FS_COMPR_FL }, /* Compress file */
1110 { 'd', FS_NODUMP_FL }, /* do not dump file */
1111 { 'e', FS_EXTENT_FL }, /* Extents */
1112 { 'i', FS_IMMUTABLE_FL }, /* Immutable file */
1113 { 'j', FS_JOURNAL_DATA_FL }, /* Reserved for ext3 */
1114 { 's', FS_SECRM_FL }, /* Secure deletion */
1115 { 'u', FS_UNRM_FL }, /* Undelete */
1116 { 't', FS_NOTAIL_FL }, /* file tail should not be merged */
1117 { 'T', FS_TOPDIR_FL }, /* Top of directory hierarchies */
1118 { 'C', FS_NOCOW_FL }, /* Do not cow file */
1119 { 'P', FS_PROJINHERIT_FL }, /* Inherit the quota project ID */
1120 };
1121
1122 enum {
1123 MODE_ADD,
1124 MODE_DEL,
1125 MODE_SET
1126 } mode = MODE_ADD;
1127
1128 unsigned value = 0, mask = 0;
1129 const char *p;
1130
1131 assert(item);
1132
1133 p = item->argument;
1134 if (p) {
1135 if (*p == '+') {
1136 mode = MODE_ADD;
1137 p++;
1138 } else if (*p == '-') {
1139 mode = MODE_DEL;
1140 p++;
1141 } else if (*p == '=') {
1142 mode = MODE_SET;
1143 p++;
1144 }
1145 }
1146
1147 if (isempty(p) && mode != MODE_SET)
1148 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
1149 "Setting file attribute on '%s' needs an attribute specification.",
1150 item->path);
1151
1152 for (; p && *p ; p++) {
1153 unsigned i, v;
1154
1155 for (i = 0; i < ELEMENTSOF(attributes); i++)
1156 if (*p == attributes[i].character)
1157 break;
1158
1159 if (i >= ELEMENTSOF(attributes))
1160 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
1161 "Unknown file attribute '%c' on '%s'.",
1162 *p, item->path);
1163
1164 v = attributes[i].value;
1165
1166 SET_FLAG(value, v, IN_SET(mode, MODE_ADD, MODE_SET));
1167
1168 mask |= v;
1169 }
1170
1171 if (mode == MODE_SET)
1172 mask |= CHATTR_ALL_FL;
1173
1174 assert(mask != 0);
1175
1176 item->attribute_mask = mask;
1177 item->attribute_value = value;
1178 item->attribute_set = true;
1179
1180 return 0;
1181 }
1182
1183 static int fd_set_attribute(Item *item, int fd, const char *path, const struct stat *st) {
1184 _cleanup_close_ int procfs_fd = -1;
1185 struct stat stbuf;
1186 unsigned f;
1187 int r;
1188
1189 assert(item);
1190 assert(fd);
1191 assert(path);
1192
1193 if (!item->attribute_set || item->attribute_mask == 0)
1194 return 0;
1195
1196 if (!st) {
1197 if (fstat(fd, &stbuf) < 0)
1198 return log_error_errno(errno, "fstat(%s) failed: %m", path);
1199 st = &stbuf;
1200 }
1201
1202 /* Issuing the file attribute ioctls on device nodes is not
1203 * safe, as that will be delivered to the drivers, not the
1204 * file system containing the device node. */
1205 if (!S_ISREG(st->st_mode) && !S_ISDIR(st->st_mode))
1206 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
1207 "Setting file flags is only supported on regular files and directories, cannot set on '%s'.",
1208 path);
1209
1210 f = item->attribute_value & item->attribute_mask;
1211
1212 /* Mask away directory-specific flags */
1213 if (!S_ISDIR(st->st_mode))
1214 f &= ~FS_DIRSYNC_FL;
1215
1216 procfs_fd = fd_reopen(fd, O_RDONLY|O_CLOEXEC|O_NOATIME);
1217 if (procfs_fd < 0)
1218 return log_error_errno(procfs_fd, "Failed to re-open '%s': %m", path);
1219
1220 r = chattr_fd(procfs_fd, f, item->attribute_mask, NULL);
1221 if (r < 0)
1222 log_full_errno(IN_SET(r, -ENOTTY, -EOPNOTSUPP) ? LOG_DEBUG : LOG_WARNING,
1223 r,
1224 "Cannot set file attribute for '%s', value=0x%08x, mask=0x%08x, ignoring: %m",
1225 path, item->attribute_value, item->attribute_mask);
1226
1227 return 0;
1228 }
1229
1230 static int path_set_attribute(Item *item, const char *path) {
1231 _cleanup_close_ int fd = -1;
1232
1233 if (!item->attribute_set || item->attribute_mask == 0)
1234 return 0;
1235
1236 fd = path_open_safe(path);
1237 if (fd < 0)
1238 return fd;
1239
1240 return fd_set_attribute(item, fd, path, NULL);
1241 }
1242
1243 static int write_one_file(Item *i, const char *path) {
1244 _cleanup_close_ int fd = -1, dir_fd = -1;
1245 char *bn;
1246 int r;
1247
1248 assert(i);
1249 assert(path);
1250 assert(i->argument);
1251 assert(i->type == WRITE_FILE);
1252
1253 /* Validate the path and keep the fd on the directory for opening the
1254 * file so we're sure that it can't be changed behind our back. */
1255 dir_fd = path_open_parent_safe(path);
1256 if (dir_fd < 0)
1257 return dir_fd;
1258
1259 bn = basename(path);
1260
1261 /* Follows symlinks */
1262 fd = openat(dir_fd, bn, O_NONBLOCK|O_CLOEXEC|O_WRONLY|O_NOCTTY, i->mode);
1263 if (fd < 0) {
1264 if (errno == ENOENT) {
1265 log_debug_errno(errno, "Not writing missing file \"%s\": %m", path);
1266 return 0;
1267 }
1268 return log_error_errno(errno, "Failed to open file \"%s\": %m", path);
1269 }
1270
1271 /* 'w' is allowed to write into any kind of files. */
1272 log_debug("Writing to \"%s\".", path);
1273
1274 r = loop_write(fd, i->argument, strlen(i->argument), false);
1275 if (r < 0)
1276 return log_error_errno(r, "Failed to write file \"%s\": %m", path);
1277
1278 return fd_set_perms(i, fd, path, NULL);
1279 }
1280
1281 static int create_file(Item *i, const char *path) {
1282 _cleanup_close_ int fd = -1, dir_fd = -1;
1283 struct stat stbuf, *st = NULL;
1284 int r = 0;
1285 char *bn;
1286
1287 assert(i);
1288 assert(path);
1289 assert(i->type == CREATE_FILE);
1290
1291 /* 'f' operates on regular files exclusively. */
1292
1293 /* Validate the path and keep the fd on the directory for opening the
1294 * file so we're sure that it can't be changed behind our back. */
1295 dir_fd = path_open_parent_safe(path);
1296 if (dir_fd < 0)
1297 return dir_fd;
1298
1299 bn = basename(path);
1300
1301 RUN_WITH_UMASK(0000) {
1302 mac_selinux_create_file_prepare(path, S_IFREG);
1303 fd = openat(dir_fd, bn, O_CREAT|O_EXCL|O_NOFOLLOW|O_NONBLOCK|O_CLOEXEC|O_WRONLY|O_NOCTTY, i->mode);
1304 mac_selinux_create_file_clear();
1305 }
1306
1307 if (fd < 0) {
1308 /* Even on a read-only filesystem, open(2) returns EEXIST if the
1309 * file already exists. It returns EROFS only if it needs to
1310 * create the file. */
1311 if (errno != EEXIST)
1312 return log_error_errno(errno, "Failed to create file %s: %m", path);
1313
1314 /* Re-open the file. At that point it must exist since open(2)
1315 * failed with EEXIST. We still need to check if the perms/mode
1316 * need to be changed. For read-only filesystems, we let
1317 * fd_set_perms() report the error if the perms need to be
1318 * modified. */
1319 fd = openat(dir_fd, bn, O_NOFOLLOW|O_CLOEXEC|O_PATH, i->mode);
1320 if (fd < 0)
1321 return log_error_errno(errno, "Failed to re-open file %s: %m", path);
1322
1323 if (fstat(fd, &stbuf) < 0)
1324 return log_error_errno(errno, "stat(%s) failed: %m", path);
1325
1326 if (!S_ISREG(stbuf.st_mode)) {
1327 log_error("%s exists and is not a regular file.", path);
1328 return -EEXIST;
1329 }
1330
1331 st = &stbuf;
1332 } else {
1333
1334 log_debug("\"%s\" has been created.", path);
1335
1336 if (i->argument) {
1337 log_debug("Writing to \"%s\".", path);
1338
1339 r = loop_write(fd, i->argument, strlen(i->argument), false);
1340 if (r < 0)
1341 return log_error_errno(r, "Failed to write file \"%s\": %m", path);
1342 }
1343 }
1344
1345 return fd_set_perms(i, fd, path, st);
1346 }
1347
1348 static int truncate_file(Item *i, const char *path) {
1349 _cleanup_close_ int fd = -1, dir_fd = -1;
1350 struct stat stbuf, *st = NULL;
1351 bool erofs = false;
1352 int r = 0;
1353 char *bn;
1354
1355 assert(i);
1356 assert(path);
1357 assert(i->type == TRUNCATE_FILE);
1358
1359 /* We want to operate on regular file exclusively especially since
1360 * O_TRUNC is unspecified if the file is neither a regular file nor a
1361 * fifo nor a terminal device. Therefore we first open the file and make
1362 * sure it's a regular one before truncating it. */
1363
1364 /* Validate the path and keep the fd on the directory for opening the
1365 * file so we're sure that it can't be changed behind our back. */
1366 dir_fd = path_open_parent_safe(path);
1367 if (dir_fd < 0)
1368 return dir_fd;
1369
1370 bn = basename(path);
1371
1372 RUN_WITH_UMASK(0000) {
1373 mac_selinux_create_file_prepare(path, S_IFREG);
1374 fd = openat(dir_fd, bn, O_CREAT|O_NOFOLLOW|O_NONBLOCK|O_CLOEXEC|O_WRONLY|O_NOCTTY, i->mode);
1375 mac_selinux_create_file_clear();
1376 }
1377
1378 if (fd < 0) {
1379 if (errno != EROFS)
1380 return log_error_errno(errno, "Failed to open/create file %s: %m", path);
1381
1382 /* On a read-only filesystem, we don't want to fail if the
1383 * target is already empty and the perms are set. So we still
1384 * proceed with the sanity checks and let the remaining
1385 * operations fail with EROFS if they try to modify the target
1386 * file. */
1387
1388 fd = openat(dir_fd, bn, O_NOFOLLOW|O_CLOEXEC|O_PATH, i->mode);
1389 if (fd < 0) {
1390 if (errno == ENOENT) {
1391 log_error("Cannot create file %s on a read-only file system.", path);
1392 return -EROFS;
1393 }
1394
1395 return log_error_errno(errno, "Failed to re-open file %s: %m", path);
1396 }
1397
1398 erofs = true;
1399 }
1400
1401 if (fstat(fd, &stbuf) < 0)
1402 return log_error_errno(errno, "stat(%s) failed: %m", path);
1403
1404 if (!S_ISREG(stbuf.st_mode)) {
1405 log_error("%s exists and is not a regular file.", path);
1406 return -EEXIST;
1407 }
1408
1409 if (stbuf.st_size > 0) {
1410 if (ftruncate(fd, 0) < 0) {
1411 r = erofs ? -EROFS : -errno;
1412 return log_error_errno(r, "Failed to truncate file %s: %m", path);
1413 }
1414 } else
1415 st = &stbuf;
1416
1417 log_debug("\"%s\" has been created.", path);
1418
1419 if (i->argument) {
1420 log_debug("Writing to \"%s\".", path);
1421
1422 r = loop_write(fd, i->argument, strlen(i->argument), false);
1423 if (r < 0) {
1424 r = erofs ? -EROFS : r;
1425 return log_error_errno(r, "Failed to write file %s: %m", path);
1426 }
1427 }
1428
1429 return fd_set_perms(i, fd, path, st);
1430 }
1431
1432 static int copy_files(Item *i) {
1433 _cleanup_close_ int dfd = -1, fd = -1;
1434 char *bn;
1435 int r;
1436
1437 log_debug("Copying tree \"%s\" to \"%s\".", i->argument, i->path);
1438
1439 bn = basename(i->path);
1440
1441 /* Validate the path and use the returned directory fd for copying the
1442 * target so we're sure that the path can't be changed behind our
1443 * back. */
1444 dfd = path_open_parent_safe(i->path);
1445 if (dfd < 0)
1446 return dfd;
1447
1448 r = copy_tree_at(AT_FDCWD, i->argument,
1449 dfd, bn,
1450 i->uid_set ? i->uid : UID_INVALID,
1451 i->gid_set ? i->gid : GID_INVALID,
1452 COPY_REFLINK | COPY_MERGE_EMPTY);
1453 if (r < 0) {
1454 struct stat a, b;
1455
1456 /* If the target already exists on read-only filesystems, trying
1457 * to create the target will not fail with EEXIST but with
1458 * EROFS. */
1459 if (r == -EROFS && faccessat(dfd, bn, F_OK, AT_SYMLINK_NOFOLLOW) == 0)
1460 r = -EEXIST;
1461
1462 if (r != -EEXIST)
1463 return log_error_errno(r, "Failed to copy files to %s: %m", i->path);
1464
1465 if (stat(i->argument, &a) < 0)
1466 return log_error_errno(errno, "stat(%s) failed: %m", i->argument);
1467
1468 if (fstatat(dfd, bn, &b, AT_SYMLINK_NOFOLLOW) < 0)
1469 return log_error_errno(errno, "stat(%s) failed: %m", i->path);
1470
1471 if ((a.st_mode ^ b.st_mode) & S_IFMT) {
1472 log_debug("Can't copy to %s, file exists already and is of different type", i->path);
1473 return 0;
1474 }
1475 }
1476
1477 fd = openat(dfd, bn, O_NOFOLLOW|O_CLOEXEC|O_PATH);
1478 if (fd < 0)
1479 return log_error_errno(errno, "Failed to openat(%s): %m", i->path);
1480
1481 return fd_set_perms(i, fd, i->path, NULL);
1482 }
1483
1484 typedef enum {
1485 CREATION_NORMAL,
1486 CREATION_EXISTING,
1487 CREATION_FORCE,
1488 _CREATION_MODE_MAX,
1489 _CREATION_MODE_INVALID = -1
1490 } CreationMode;
1491
1492 static const char *const creation_mode_verb_table[_CREATION_MODE_MAX] = {
1493 [CREATION_NORMAL] = "Created",
1494 [CREATION_EXISTING] = "Found existing",
1495 [CREATION_FORCE] = "Created replacement",
1496 };
1497
1498 DEFINE_PRIVATE_STRING_TABLE_LOOKUP_TO_STRING(creation_mode_verb, CreationMode);
1499
1500 static int create_directory_or_subvolume(const char *path, mode_t mode, bool subvol, CreationMode *creation) {
1501 _cleanup_close_ int pfd = -1;
1502 CreationMode c;
1503 int r;
1504
1505 assert(path);
1506
1507 if (!creation)
1508 creation = &c;
1509
1510 pfd = path_open_parent_safe(path);
1511 if (pfd < 0)
1512 return pfd;
1513
1514 if (subvol) {
1515 if (btrfs_is_subvol(empty_to_root(arg_root)) <= 0)
1516
1517 /* Don't create a subvolume unless the root directory is
1518 * one, too. We do this under the assumption that if the
1519 * root directory is just a plain directory (i.e. very
1520 * light-weight), we shouldn't try to split it up into
1521 * subvolumes (i.e. more heavy-weight). Thus, chroot()
1522 * environments and suchlike will get a full brtfs
1523 * subvolume set up below their tree only if they
1524 * specifically set up a btrfs subvolume for the root
1525 * dir too. */
1526
1527 subvol = false;
1528 else {
1529 RUN_WITH_UMASK((~mode) & 0777)
1530 r = btrfs_subvol_make_fd(pfd, basename(path));
1531 }
1532 } else
1533 r = 0;
1534
1535 if (!subvol || r == -ENOTTY)
1536 RUN_WITH_UMASK(0000)
1537 r = mkdirat_label(pfd, basename(path), mode);
1538
1539 if (r < 0) {
1540 int k;
1541
1542 if (!IN_SET(r, -EEXIST, -EROFS))
1543 return log_error_errno(r, "Failed to create directory or subvolume \"%s\": %m", path);
1544
1545 k = is_dir_fd(pfd);
1546 if (k == -ENOENT && r == -EROFS)
1547 return log_error_errno(r, "%s does not exist and cannot be created as the file system is read-only.", path);
1548 if (k < 0)
1549 return log_error_errno(k, "Failed to check if %s exists: %m", path);
1550 if (!k) {
1551 log_warning("\"%s\" already exists and is not a directory.", path);
1552 return -EEXIST;
1553 }
1554
1555 *creation = CREATION_EXISTING;
1556 } else
1557 *creation = CREATION_NORMAL;
1558
1559 log_debug("%s directory \"%s\".", creation_mode_verb_to_string(*creation), path);
1560
1561 r = openat(pfd, basename(path), O_NOCTTY|O_CLOEXEC|O_DIRECTORY);
1562 if (r < 0)
1563 return log_error_errno(errno, "Failed to open directory '%s': %m", basename(path));
1564
1565 return r;
1566 }
1567
1568 static int create_directory(Item *i, const char *path) {
1569 _cleanup_close_ int fd = -1;
1570
1571 assert(i);
1572 assert(IN_SET(i->type, CREATE_DIRECTORY, TRUNCATE_DIRECTORY));
1573
1574 fd = create_directory_or_subvolume(path, i->mode, false, NULL);
1575 if (fd == -EEXIST)
1576 return 0;
1577 if (fd < 0)
1578 return fd;
1579
1580 return fd_set_perms(i, fd, path, NULL);
1581 }
1582
1583 static int create_subvolume(Item *i, const char *path) {
1584 _cleanup_close_ int fd = -1;
1585 CreationMode creation;
1586 int r, q = 0;
1587
1588 assert(i);
1589 assert(IN_SET(i->type, CREATE_SUBVOLUME, CREATE_SUBVOLUME_NEW_QUOTA, CREATE_SUBVOLUME_INHERIT_QUOTA));
1590
1591 fd = create_directory_or_subvolume(path, i->mode, true, &creation);
1592 if (fd == -EEXIST)
1593 return 0;
1594 if (fd < 0)
1595 return fd;
1596
1597 if (creation == CREATION_NORMAL &&
1598 IN_SET(i->type, CREATE_SUBVOLUME_NEW_QUOTA, CREATE_SUBVOLUME_INHERIT_QUOTA)) {
1599 r = btrfs_subvol_auto_qgroup_fd(fd, 0, i->type == CREATE_SUBVOLUME_NEW_QUOTA);
1600 if (r == -ENOTTY)
1601 log_debug_errno(r, "Couldn't adjust quota for subvolume \"%s\" (unsupported fs or dir not a subvolume): %m", i->path);
1602 else if (r == -EROFS)
1603 log_debug_errno(r, "Couldn't adjust quota for subvolume \"%s\" (fs is read-only).", i->path);
1604 else if (r == -ENOPROTOOPT)
1605 log_debug_errno(r, "Couldn't adjust quota for subvolume \"%s\" (quota support is disabled).", i->path);
1606 else if (r < 0)
1607 q = log_error_errno(r, "Failed to adjust quota for subvolume \"%s\": %m", i->path);
1608 else if (r > 0)
1609 log_debug("Adjusted quota for subvolume \"%s\".", i->path);
1610 else if (r == 0)
1611 log_debug("Quota for subvolume \"%s\" already in place, no change made.", i->path);
1612 }
1613
1614 r = fd_set_perms(i, fd, path, NULL);
1615 if (q < 0) /* prefer the quota change error from above */
1616 return q;
1617
1618 return r;
1619 }
1620
1621 static int empty_directory(Item *i, const char *path) {
1622 int r;
1623
1624 assert(i);
1625 assert(i->type == EMPTY_DIRECTORY);
1626
1627 r = is_dir(path, false);
1628 if (r == -ENOENT) {
1629 /* Option "e" operates only on existing objects. Do not
1630 * print errors about non-existent files or directories */
1631 log_debug("Skipping missing directory: %s", path);
1632 return 0;
1633 }
1634 if (r < 0)
1635 return log_error_errno(r, "is_dir() failed on path %s: %m", path);
1636 if (r == 0)
1637 return log_error_errno(SYNTHETIC_ERRNO(EEXIST),
1638 "'%s' already exists and is not a directory.",
1639 path);
1640
1641 return path_set_perms(i, path);
1642 }
1643
1644 static int create_device(Item *i, mode_t file_type) {
1645 _cleanup_close_ int dfd = -1, fd = -1;
1646 CreationMode creation;
1647 char *bn;
1648 int r;
1649
1650 assert(i);
1651 assert(IN_SET(file_type, S_IFBLK, S_IFCHR));
1652
1653 bn = basename(i->path);
1654
1655 /* Validate the path and use the returned directory fd for copying the
1656 * target so we're sure that the path can't be changed behind our
1657 * back. */
1658 dfd = path_open_parent_safe(i->path);
1659 if (dfd < 0)
1660 return dfd;
1661
1662 RUN_WITH_UMASK(0000) {
1663 mac_selinux_create_file_prepare(i->path, file_type);
1664 r = mknodat(dfd, bn, i->mode | file_type, i->major_minor);
1665 mac_selinux_create_file_clear();
1666 }
1667
1668 if (r < 0) {
1669 struct stat st;
1670
1671 if (errno == EPERM) {
1672 log_debug("We lack permissions, possibly because of cgroup configuration; "
1673 "skipping creation of device node %s.", i->path);
1674 return 0;
1675 }
1676
1677 if (errno != EEXIST)
1678 return log_error_errno(errno, "Failed to create device node %s: %m", i->path);
1679
1680 if (fstatat(dfd, bn, &st, 0) < 0)
1681 return log_error_errno(errno, "stat(%s) failed: %m", i->path);
1682
1683 if ((st.st_mode & S_IFMT) != file_type) {
1684
1685 if (i->force) {
1686
1687 RUN_WITH_UMASK(0000) {
1688 mac_selinux_create_file_prepare(i->path, file_type);
1689 /* FIXME: need to introduce mknodat_atomic() */
1690 r = mknod_atomic(i->path, i->mode | file_type, i->major_minor);
1691 mac_selinux_create_file_clear();
1692 }
1693
1694 if (r < 0)
1695 return log_error_errno(r, "Failed to create device node \"%s\": %m", i->path);
1696 creation = CREATION_FORCE;
1697 } else {
1698 log_debug("%s is not a device node.", i->path);
1699 return 0;
1700 }
1701 } else
1702 creation = CREATION_EXISTING;
1703 } else
1704 creation = CREATION_NORMAL;
1705
1706 log_debug("%s %s device node \"%s\" %u:%u.",
1707 creation_mode_verb_to_string(creation),
1708 i->type == CREATE_BLOCK_DEVICE ? "block" : "char",
1709 i->path, major(i->mode), minor(i->mode));
1710
1711 fd = openat(dfd, bn, O_NOFOLLOW|O_CLOEXEC|O_PATH);
1712 if (fd < 0)
1713 return log_error_errno(errno, "Failed to openat(%s): %m", i->path);
1714
1715 return fd_set_perms(i, fd, i->path, NULL);
1716 }
1717
1718 static int create_fifo(Item *i, const char *path) {
1719 _cleanup_close_ int pfd = -1, fd = -1;
1720 CreationMode creation;
1721 struct stat st;
1722 char *bn;
1723 int r;
1724
1725 pfd = path_open_parent_safe(path);
1726 if (pfd < 0)
1727 return pfd;
1728
1729 bn = basename(path);
1730
1731 RUN_WITH_UMASK(0000) {
1732 mac_selinux_create_file_prepare(path, S_IFIFO);
1733 r = mkfifoat(pfd, bn, i->mode);
1734 mac_selinux_create_file_clear();
1735 }
1736
1737 if (r < 0) {
1738 if (errno != EEXIST)
1739 return log_error_errno(errno, "Failed to create fifo %s: %m", path);
1740
1741 if (fstatat(pfd, bn, &st, AT_SYMLINK_NOFOLLOW) < 0)
1742 return log_error_errno(errno, "stat(%s) failed: %m", path);
1743
1744 if (!S_ISFIFO(st.st_mode)) {
1745
1746 if (i->force) {
1747 RUN_WITH_UMASK(0000) {
1748 mac_selinux_create_file_prepare(path, S_IFIFO);
1749 r = mkfifoat_atomic(pfd, bn, i->mode);
1750 mac_selinux_create_file_clear();
1751 }
1752
1753 if (r < 0)
1754 return log_error_errno(r, "Failed to create fifo %s: %m", path);
1755 creation = CREATION_FORCE;
1756 } else {
1757 log_warning("\"%s\" already exists and is not a fifo.", path);
1758 return 0;
1759 }
1760 } else
1761 creation = CREATION_EXISTING;
1762 } else
1763 creation = CREATION_NORMAL;
1764
1765 log_debug("%s fifo \"%s\".", creation_mode_verb_to_string(creation), path);
1766
1767 fd = openat(pfd, bn, O_NOFOLLOW|O_CLOEXEC|O_PATH);
1768 if (fd < 0)
1769 return log_error_errno(errno, "Failed to openat(%s): %m", path);
1770
1771 return fd_set_perms(i, fd, i->path, NULL);
1772 }
1773
1774 typedef int (*action_t)(Item *i, const char *path);
1775 typedef int (*fdaction_t)(Item *i, int fd, const char *path, const struct stat *st);
1776
1777 static int item_do(Item *i, int fd, const char *path, fdaction_t action) {
1778 struct stat st;
1779 int r = 0, q;
1780
1781 assert(i);
1782 assert(path);
1783 assert(fd >= 0);
1784
1785 if (fstat(fd, &st) < 0) {
1786 r = log_error_errno(errno, "fstat() on file failed: %m");
1787 goto finish;
1788 }
1789
1790 /* This returns the first error we run into, but nevertheless
1791 * tries to go on */
1792 r = action(i, fd, path, &st);
1793
1794 if (S_ISDIR(st.st_mode)) {
1795 char procfs_path[STRLEN("/proc/self/fd/") + DECIMAL_STR_MAX(int)];
1796 _cleanup_closedir_ DIR *d = NULL;
1797 struct dirent *de;
1798
1799 /* The passed 'fd' was opened with O_PATH. We need to convert
1800 * it into a 'regular' fd before reading the directory content. */
1801 xsprintf(procfs_path, "/proc/self/fd/%i", fd);
1802
1803 d = opendir(procfs_path);
1804 if (!d) {
1805 log_error_errno(errno, "Failed to opendir() '%s': %m", procfs_path);
1806 if (r == 0)
1807 r = -errno;
1808 goto finish;
1809 }
1810
1811 FOREACH_DIRENT_ALL(de, d, q = -errno; goto finish) {
1812 int de_fd;
1813
1814 if (dot_or_dot_dot(de->d_name))
1815 continue;
1816
1817 de_fd = openat(fd, de->d_name, O_NOFOLLOW|O_CLOEXEC|O_PATH);
1818 if (de_fd < 0)
1819 q = log_error_errno(errno, "Failed to open() file '%s': %m", de->d_name);
1820 else {
1821 _cleanup_free_ char *de_path = NULL;
1822
1823 de_path = path_join(path, de->d_name);
1824 if (!de_path)
1825 q = log_oom();
1826 else
1827 /* Pass ownership of dirent fd over */
1828 q = item_do(i, de_fd, de_path, action);
1829 }
1830
1831 if (q < 0 && r == 0)
1832 r = q;
1833 }
1834 }
1835 finish:
1836 safe_close(fd);
1837 return r;
1838 }
1839
1840 static int glob_item(Item *i, action_t action) {
1841 _cleanup_globfree_ glob_t g = {
1842 .gl_opendir = (void *(*)(const char *)) opendir_nomod,
1843 };
1844 int r = 0, k;
1845 char **fn;
1846
1847 k = safe_glob(i->path, GLOB_NOSORT|GLOB_BRACE, &g);
1848 if (k < 0 && k != -ENOENT)
1849 return log_error_errno(k, "glob(%s) failed: %m", i->path);
1850
1851 STRV_FOREACH(fn, g.gl_pathv) {
1852 k = action(i, *fn);
1853 if (k < 0 && r == 0)
1854 r = k;
1855 }
1856
1857 return r;
1858 }
1859
1860 static int glob_item_recursively(Item *i, fdaction_t action) {
1861 _cleanup_globfree_ glob_t g = {
1862 .gl_opendir = (void *(*)(const char *)) opendir_nomod,
1863 };
1864 int r = 0, k;
1865 char **fn;
1866
1867 k = safe_glob(i->path, GLOB_NOSORT|GLOB_BRACE, &g);
1868 if (k < 0 && k != -ENOENT)
1869 return log_error_errno(k, "glob(%s) failed: %m", i->path);
1870
1871 STRV_FOREACH(fn, g.gl_pathv) {
1872 _cleanup_close_ int fd = -1;
1873
1874 /* Make sure we won't trigger/follow file object (such as
1875 * device nodes, automounts, ...) pointed out by 'fn' with
1876 * O_PATH. Note, when O_PATH is used, flags other than
1877 * O_CLOEXEC, O_DIRECTORY, and O_NOFOLLOW are ignored. */
1878
1879 fd = open(*fn, O_CLOEXEC|O_NOFOLLOW|O_PATH);
1880 if (fd < 0) {
1881 log_error_errno(errno, "Opening '%s' failed: %m", *fn);
1882 if (r == 0)
1883 r = -errno;
1884 continue;
1885 }
1886
1887 k = item_do(i, fd, *fn, action);
1888 if (k < 0 && r == 0)
1889 r = k;
1890
1891 /* we passed fd ownership to the previous call */
1892 fd = -1;
1893 }
1894
1895 return r;
1896 }
1897
1898 static int create_item(Item *i) {
1899 CreationMode creation;
1900 int r = 0;
1901
1902 assert(i);
1903
1904 log_debug("Running create action for entry %c %s", (char) i->type, i->path);
1905
1906 switch (i->type) {
1907
1908 case IGNORE_PATH:
1909 case IGNORE_DIRECTORY_PATH:
1910 case REMOVE_PATH:
1911 case RECURSIVE_REMOVE_PATH:
1912 return 0;
1913
1914 case CREATE_FILE:
1915 RUN_WITH_UMASK(0000)
1916 (void) mkdir_parents_label(i->path, 0755);
1917
1918 r = create_file(i, i->path);
1919 if (r < 0)
1920 return r;
1921 break;
1922
1923 case TRUNCATE_FILE:
1924 RUN_WITH_UMASK(0000)
1925 (void) mkdir_parents_label(i->path, 0755);
1926
1927 r = truncate_file(i, i->path);
1928 if (r < 0)
1929 return r;
1930 break;
1931
1932 case COPY_FILES:
1933 RUN_WITH_UMASK(0000)
1934 (void) mkdir_parents_label(i->path, 0755);
1935
1936 r = copy_files(i);
1937 if (r < 0)
1938 return r;
1939 break;
1940
1941 case WRITE_FILE:
1942 r = glob_item(i, write_one_file);
1943 if (r < 0)
1944 return r;
1945
1946 break;
1947
1948 case CREATE_DIRECTORY:
1949 case TRUNCATE_DIRECTORY:
1950 RUN_WITH_UMASK(0000)
1951 (void) mkdir_parents_label(i->path, 0755);
1952
1953 r = create_directory(i, i->path);
1954 if (r < 0)
1955 return r;
1956 break;
1957
1958 case CREATE_SUBVOLUME:
1959 case CREATE_SUBVOLUME_INHERIT_QUOTA:
1960 case CREATE_SUBVOLUME_NEW_QUOTA:
1961 RUN_WITH_UMASK(0000)
1962 (void) mkdir_parents_label(i->path, 0755);
1963
1964 r = create_subvolume(i, i->path);
1965 if (r < 0)
1966 return r;
1967 break;
1968
1969 case EMPTY_DIRECTORY:
1970 r = glob_item(i, empty_directory);
1971 if (r < 0)
1972 return r;
1973 break;
1974
1975 case CREATE_FIFO:
1976 RUN_WITH_UMASK(0000)
1977 (void) mkdir_parents_label(i->path, 0755);
1978
1979 r = create_fifo(i, i->path);
1980 if (r < 0)
1981 return r;
1982 break;
1983
1984 case CREATE_SYMLINK: {
1985 RUN_WITH_UMASK(0000)
1986 (void) mkdir_parents_label(i->path, 0755);
1987
1988 mac_selinux_create_file_prepare(i->path, S_IFLNK);
1989 r = symlink(i->argument, i->path);
1990 mac_selinux_create_file_clear();
1991
1992 if (r < 0) {
1993 _cleanup_free_ char *x = NULL;
1994
1995 if (errno != EEXIST)
1996 return log_error_errno(errno, "symlink(%s, %s) failed: %m", i->argument, i->path);
1997
1998 r = readlink_malloc(i->path, &x);
1999 if (r < 0 || !streq(i->argument, x)) {
2000
2001 if (i->force) {
2002 mac_selinux_create_file_prepare(i->path, S_IFLNK);
2003 r = symlink_atomic(i->argument, i->path);
2004 mac_selinux_create_file_clear();
2005
2006 if (IN_SET(r, -EISDIR, -EEXIST, -ENOTEMPTY)) {
2007 r = rm_rf(i->path, REMOVE_ROOT|REMOVE_PHYSICAL);
2008 if (r < 0)
2009 return log_error_errno(r, "rm -fr %s failed: %m", i->path);
2010
2011 mac_selinux_create_file_prepare(i->path, S_IFLNK);
2012 r = symlink(i->argument, i->path) < 0 ? -errno : 0;
2013 mac_selinux_create_file_clear();
2014 }
2015 if (r < 0)
2016 return log_error_errno(r, "symlink(%s, %s) failed: %m", i->argument, i->path);
2017
2018 creation = CREATION_FORCE;
2019 } else {
2020 log_debug("\"%s\" is not a symlink or does not point to the correct path.", i->path);
2021 return 0;
2022 }
2023 } else
2024 creation = CREATION_EXISTING;
2025 } else
2026
2027 creation = CREATION_NORMAL;
2028 log_debug("%s symlink \"%s\".", creation_mode_verb_to_string(creation), i->path);
2029 break;
2030 }
2031
2032 case CREATE_BLOCK_DEVICE:
2033 case CREATE_CHAR_DEVICE:
2034 if (have_effective_cap(CAP_MKNOD) == 0) {
2035 /* In a container we lack CAP_MKNOD. We shouldn't attempt to create the device node in that
2036 * case to avoid noise, and we don't support virtualized devices in containers anyway. */
2037
2038 log_debug("We lack CAP_MKNOD, skipping creation of device node %s.", i->path);
2039 return 0;
2040 }
2041
2042 RUN_WITH_UMASK(0000)
2043 (void) mkdir_parents_label(i->path, 0755);
2044
2045 r = create_device(i, i->type == CREATE_BLOCK_DEVICE ? S_IFBLK : S_IFCHR);
2046 if (r < 0)
2047 return r;
2048
2049 break;
2050
2051 case ADJUST_MODE:
2052 case RELABEL_PATH:
2053 r = glob_item(i, path_set_perms);
2054 if (r < 0)
2055 return r;
2056 break;
2057
2058 case RECURSIVE_RELABEL_PATH:
2059 r = glob_item_recursively(i, fd_set_perms);
2060 if (r < 0)
2061 return r;
2062 break;
2063
2064 case SET_XATTR:
2065 r = glob_item(i, path_set_xattrs);
2066 if (r < 0)
2067 return r;
2068 break;
2069
2070 case RECURSIVE_SET_XATTR:
2071 r = glob_item_recursively(i, fd_set_xattrs);
2072 if (r < 0)
2073 return r;
2074 break;
2075
2076 case SET_ACL:
2077 r = glob_item(i, path_set_acls);
2078 if (r < 0)
2079 return r;
2080 break;
2081
2082 case RECURSIVE_SET_ACL:
2083 r = glob_item_recursively(i, fd_set_acls);
2084 if (r < 0)
2085 return r;
2086 break;
2087
2088 case SET_ATTRIBUTE:
2089 r = glob_item(i, path_set_attribute);
2090 if (r < 0)
2091 return r;
2092 break;
2093
2094 case RECURSIVE_SET_ATTRIBUTE:
2095 r = glob_item_recursively(i, fd_set_attribute);
2096 if (r < 0)
2097 return r;
2098 break;
2099 }
2100
2101 return 0;
2102 }
2103
2104 static int remove_item_instance(Item *i, const char *instance) {
2105 int r;
2106
2107 assert(i);
2108
2109 switch (i->type) {
2110
2111 case REMOVE_PATH:
2112 if (remove(instance) < 0 && errno != ENOENT)
2113 return log_error_errno(errno, "rm(%s): %m", instance);
2114
2115 break;
2116
2117 case RECURSIVE_REMOVE_PATH:
2118 /* FIXME: we probably should use dir_cleanup() here instead of rm_rf() so that 'x' is honoured. */
2119 log_debug("rm -rf \"%s\"", instance);
2120 r = rm_rf(instance, REMOVE_ROOT|REMOVE_SUBVOLUME|REMOVE_PHYSICAL);
2121 if (r < 0 && r != -ENOENT)
2122 return log_error_errno(r, "rm_rf(%s): %m", instance);
2123
2124 break;
2125
2126 default:
2127 assert_not_reached("wut?");
2128 }
2129
2130 return 0;
2131 }
2132
2133 static int remove_item(Item *i) {
2134 int r;
2135
2136 assert(i);
2137
2138 log_debug("Running remove action for entry %c %s", (char) i->type, i->path);
2139
2140 switch (i->type) {
2141
2142 case TRUNCATE_DIRECTORY:
2143 /* FIXME: we probably should use dir_cleanup() here instead of rm_rf() so that 'x' is honoured. */
2144 log_debug("rm -rf \"%s\"", i->path);
2145 r = rm_rf(i->path, REMOVE_PHYSICAL);
2146 if (r < 0 && r != -ENOENT)
2147 return log_error_errno(r, "rm_rf(%s): %m", i->path);
2148
2149 return 0;
2150
2151 case REMOVE_PATH:
2152 case RECURSIVE_REMOVE_PATH:
2153 return glob_item(i, remove_item_instance);
2154
2155 default:
2156 return 0;
2157 }
2158 }
2159
2160 static int clean_item_instance(Item *i, const char* instance) {
2161 _cleanup_closedir_ DIR *d = NULL;
2162 struct stat s, ps;
2163 bool mountpoint;
2164 usec_t cutoff, n;
2165 char timestamp[FORMAT_TIMESTAMP_MAX];
2166
2167 assert(i);
2168
2169 if (!i->age_set)
2170 return 0;
2171
2172 n = now(CLOCK_REALTIME);
2173 if (n < i->age)
2174 return 0;
2175
2176 cutoff = n - i->age;
2177
2178 d = opendir_nomod(instance);
2179 if (!d) {
2180 if (IN_SET(errno, ENOENT, ENOTDIR)) {
2181 log_debug_errno(errno, "Directory \"%s\": %m", instance);
2182 return 0;
2183 }
2184
2185 return log_error_errno(errno, "Failed to open directory %s: %m", instance);
2186 }
2187
2188 if (fstat(dirfd(d), &s) < 0)
2189 return log_error_errno(errno, "stat(%s) failed: %m", i->path);
2190
2191 if (!S_ISDIR(s.st_mode))
2192 return log_error_errno(SYNTHETIC_ERRNO(ENOTDIR),
2193 "%s is not a directory.", i->path);
2194
2195 if (fstatat(dirfd(d), "..", &ps, AT_SYMLINK_NOFOLLOW) != 0)
2196 return log_error_errno(errno, "stat(%s/..) failed: %m", i->path);
2197
2198 mountpoint = s.st_dev != ps.st_dev || s.st_ino == ps.st_ino;
2199
2200 log_debug("Cleanup threshold for %s \"%s\" is %s",
2201 mountpoint ? "mount point" : "directory",
2202 instance,
2203 format_timestamp_us(timestamp, sizeof(timestamp), cutoff));
2204
2205 return dir_cleanup(i, instance, d, &s, cutoff, s.st_dev, mountpoint,
2206 MAX_DEPTH, i->keep_first_level);
2207 }
2208
2209 static int clean_item(Item *i) {
2210 assert(i);
2211
2212 log_debug("Running clean action for entry %c %s", (char) i->type, i->path);
2213
2214 switch (i->type) {
2215 case CREATE_DIRECTORY:
2216 case CREATE_SUBVOLUME:
2217 case CREATE_SUBVOLUME_INHERIT_QUOTA:
2218 case CREATE_SUBVOLUME_NEW_QUOTA:
2219 case TRUNCATE_DIRECTORY:
2220 case IGNORE_PATH:
2221 case COPY_FILES:
2222 clean_item_instance(i, i->path);
2223 return 0;
2224 case EMPTY_DIRECTORY:
2225 case IGNORE_DIRECTORY_PATH:
2226 return glob_item(i, clean_item_instance);
2227 default:
2228 return 0;
2229 }
2230 }
2231
2232 static int process_item(Item *i, OperationMask operation) {
2233 OperationMask todo;
2234 int r, q, p;
2235
2236 assert(i);
2237
2238 todo = operation & ~i->done;
2239 if (todo == 0) /* Everything already done? */
2240 return 0;
2241
2242 i->done |= operation;
2243
2244 r = chase_symlinks(i->path, arg_root, CHASE_NO_AUTOFS|CHASE_WARN, NULL);
2245 if (r == -EREMOTE) {
2246 log_notice_errno(r, "Skipping %s", i->path);
2247 return 0;
2248 }
2249 if (r < 0)
2250 log_debug_errno(r, "Failed to determine whether '%s' is below autofs, ignoring: %m", i->path);
2251
2252 r = FLAGS_SET(operation, OPERATION_CREATE) ? create_item(i) : 0;
2253 /* Failure can only be tolerated for create */
2254 if (i->allow_failure)
2255 r = 0;
2256
2257 q = FLAGS_SET(operation, OPERATION_REMOVE) ? remove_item(i) : 0;
2258 p = FLAGS_SET(operation, OPERATION_CLEAN) ? clean_item(i) : 0;
2259
2260 return r < 0 ? r :
2261 q < 0 ? q :
2262 p;
2263 }
2264
2265 static int process_item_array(ItemArray *array, OperationMask operation) {
2266 int r = 0;
2267 size_t n;
2268
2269 assert(array);
2270
2271 /* Create any parent first. */
2272 if (FLAGS_SET(operation, OPERATION_CREATE) && array->parent)
2273 r = process_item_array(array->parent, operation & OPERATION_CREATE);
2274
2275 /* Clean up all children first */
2276 if ((operation & (OPERATION_REMOVE|OPERATION_CLEAN)) && !set_isempty(array->children)) {
2277 Iterator i;
2278 ItemArray *c;
2279
2280 SET_FOREACH(c, array->children, i) {
2281 int k;
2282
2283 k = process_item_array(c, operation & (OPERATION_REMOVE|OPERATION_CLEAN));
2284 if (k < 0 && r == 0)
2285 r = k;
2286 }
2287 }
2288
2289 for (n = 0; n < array->n_items; n++) {
2290 int k;
2291
2292 k = process_item(array->items + n, operation);
2293 if (k < 0 && r == 0)
2294 r = k;
2295 }
2296
2297 return r;
2298 }
2299
2300 static void item_free_contents(Item *i) {
2301 assert(i);
2302 free(i->path);
2303 free(i->argument);
2304 strv_free(i->xattrs);
2305
2306 #if HAVE_ACL
2307 acl_free(i->acl_access);
2308 acl_free(i->acl_default);
2309 #endif
2310 }
2311
2312 static ItemArray* item_array_free(ItemArray *a) {
2313 size_t n;
2314
2315 if (!a)
2316 return NULL;
2317
2318 for (n = 0; n < a->n_items; n++)
2319 item_free_contents(a->items + n);
2320
2321 set_free(a->children);
2322 free(a->items);
2323 return mfree(a);
2324 }
2325
2326 static int item_compare(const Item *a, const Item *b) {
2327 /* Make sure that the ownership taking item is put first, so
2328 * that we first create the node, and then can adjust it */
2329
2330 if (takes_ownership(a->type) && !takes_ownership(b->type))
2331 return -1;
2332 if (!takes_ownership(a->type) && takes_ownership(b->type))
2333 return 1;
2334
2335 return CMP(a->type, b->type);
2336 }
2337
2338 static bool item_compatible(Item *a, Item *b) {
2339 assert(a);
2340 assert(b);
2341 assert(streq(a->path, b->path));
2342
2343 if (takes_ownership(a->type) && takes_ownership(b->type))
2344 /* check if the items are the same */
2345 return streq_ptr(a->argument, b->argument) &&
2346
2347 a->uid_set == b->uid_set &&
2348 a->uid == b->uid &&
2349
2350 a->gid_set == b->gid_set &&
2351 a->gid == b->gid &&
2352
2353 a->mode_set == b->mode_set &&
2354 a->mode == b->mode &&
2355
2356 a->age_set == b->age_set &&
2357 a->age == b->age &&
2358
2359 a->mask_perms == b->mask_perms &&
2360
2361 a->keep_first_level == b->keep_first_level &&
2362
2363 a->major_minor == b->major_minor;
2364
2365 return true;
2366 }
2367
2368 static bool should_include_path(const char *path) {
2369 char **prefix;
2370
2371 STRV_FOREACH(prefix, arg_exclude_prefixes)
2372 if (path_startswith(path, *prefix)) {
2373 log_debug("Entry \"%s\" matches exclude prefix \"%s\", skipping.",
2374 path, *prefix);
2375 return false;
2376 }
2377
2378 STRV_FOREACH(prefix, arg_include_prefixes)
2379 if (path_startswith(path, *prefix)) {
2380 log_debug("Entry \"%s\" matches include prefix \"%s\".", path, *prefix);
2381 return true;
2382 }
2383
2384 /* no matches, so we should include this path only if we
2385 * have no whitelist at all */
2386 if (strv_isempty(arg_include_prefixes))
2387 return true;
2388
2389 log_debug("Entry \"%s\" does not match any include prefix, skipping.", path);
2390 return false;
2391 }
2392
2393 static int specifier_expansion_from_arg(Item *i) {
2394 _cleanup_free_ char *unescaped = NULL, *resolved = NULL;
2395 char **xattr;
2396 int r;
2397
2398 assert(i);
2399
2400 if (i->argument == NULL)
2401 return 0;
2402
2403 switch (i->type) {
2404 case COPY_FILES:
2405 case CREATE_SYMLINK:
2406 case CREATE_FILE:
2407 case TRUNCATE_FILE:
2408 case WRITE_FILE:
2409 r = cunescape(i->argument, 0, &unescaped);
2410 if (r < 0)
2411 return log_error_errno(r, "Failed to unescape parameter to write: %s", i->argument);
2412
2413 r = specifier_printf(unescaped, specifier_table, NULL, &resolved);
2414 if (r < 0)
2415 return r;
2416
2417 free_and_replace(i->argument, resolved);
2418 break;
2419
2420 case SET_XATTR:
2421 case RECURSIVE_SET_XATTR:
2422 assert(i->xattrs);
2423
2424 STRV_FOREACH (xattr, i->xattrs) {
2425 r = specifier_printf(*xattr, specifier_table, NULL, &resolved);
2426 if (r < 0)
2427 return r;
2428
2429 free_and_replace(*xattr, resolved);
2430 }
2431 break;
2432
2433 default:
2434 break;
2435 }
2436 return 0;
2437 }
2438
2439 static int patch_var_run(const char *fname, unsigned line, char **path) {
2440 const char *k;
2441 char *n;
2442
2443 assert(path);
2444 assert(*path);
2445
2446 /* Optionally rewrites lines referencing /var/run/, to use /run/ instead. Why bother? tmpfiles merges lines in
2447 * some cases and detects conflicts in others. If files/directories are specified through two equivalent lines
2448 * this is problematic as neither case will be detected. Ideally we'd detect these cases by resolving symlinks
2449 * early, but that's precisely not what we can do here as this code very likely is running very early on, at a
2450 * time where the paths in question are not available yet, or even more importantly, our own tmpfiles rules
2451 * might create the paths that are intermediary to the listed paths. We can't really cover the generic case,
2452 * but the least we can do is cover the specific case of /var/run vs. /run, as /var/run is a legacy name for
2453 * /run only, and we explicitly document that and require that on systemd systems the former is a symlink to
2454 * the latter. Moreover files below this path are by far the primary usecase for tmpfiles.d/. */
2455
2456 k = path_startswith(*path, "/var/run/");
2457 if (isempty(k)) /* Don't complain about other paths than /var/run, and not about /var/run itself either. */
2458 return 0;
2459
2460 n = strjoin("/run/", k);
2461 if (!n)
2462 return log_oom();
2463
2464 /* Also log about this briefly. We do so at LOG_NOTICE level, as we fixed up the situation automatically, hence
2465 * there's no immediate need for action by the user. However, in the interest of making things less confusing
2466 * to the user, let's still inform the user that these snippets should really be updated. */
2467
2468 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);
2469
2470 free_and_replace(*path, n);
2471
2472 return 0;
2473 }
2474
2475 static int parse_line(const char *fname, unsigned line, const char *buffer, bool *invalid_config) {
2476
2477 _cleanup_free_ char *action = NULL, *mode = NULL, *user = NULL, *group = NULL, *age = NULL, *path = NULL;
2478 _cleanup_(item_free_contents) Item i = {};
2479 ItemArray *existing;
2480 OrderedHashmap *h;
2481 int r, pos;
2482 bool force = false, boot = false, allow_failure = false;
2483
2484 assert(fname);
2485 assert(line >= 1);
2486 assert(buffer);
2487
2488 r = extract_many_words(
2489 &buffer,
2490 NULL,
2491 EXTRACT_QUOTES,
2492 &action,
2493 &path,
2494 &mode,
2495 &user,
2496 &group,
2497 &age,
2498 NULL);
2499 if (r < 0) {
2500 if (IN_SET(r, -EINVAL, -EBADSLT))
2501 /* invalid quoting and such or an unknown specifier */
2502 *invalid_config = true;
2503 return log_error_errno(r, "[%s:%u] Failed to parse line: %m", fname, line);
2504 } else if (r < 2) {
2505 *invalid_config = true;
2506 log_error("[%s:%u] Syntax error.", fname, line);
2507 return -EIO;
2508 }
2509
2510 if (!isempty(buffer) && !streq(buffer, "-")) {
2511 i.argument = strdup(buffer);
2512 if (!i.argument)
2513 return log_oom();
2514 }
2515
2516 if (isempty(action)) {
2517 *invalid_config = true;
2518 log_error("[%s:%u] Command too short '%s'.", fname, line, action);
2519 return -EINVAL;
2520 }
2521
2522 for (pos = 1; action[pos]; pos++) {
2523 if (action[pos] == '!' && !boot)
2524 boot = true;
2525 else if (action[pos] == '+' && !force)
2526 force = true;
2527 else if (action[pos] == '-' && !allow_failure)
2528 allow_failure = true;
2529 else {
2530 *invalid_config = true;
2531 log_error("[%s:%u] Unknown modifiers in command '%s'",
2532 fname, line, action);
2533 return -EINVAL;
2534 }
2535 }
2536
2537 if (boot && !arg_boot) {
2538 log_debug("Ignoring entry %s \"%s\" because --boot is not specified.",
2539 action, path);
2540 return 0;
2541 }
2542
2543 i.type = action[0];
2544 i.force = force;
2545 i.allow_failure = allow_failure;
2546
2547 r = specifier_printf(path, specifier_table, NULL, &i.path);
2548 if (r == -ENXIO)
2549 return log_unresolvable_specifier(fname, line);
2550 if (r < 0) {
2551 if (IN_SET(r, -EINVAL, -EBADSLT))
2552 *invalid_config = true;
2553 return log_error_errno(r, "[%s:%u] Failed to replace specifiers: %s", fname, line, path);
2554 }
2555
2556 r = patch_var_run(fname, line, &i.path);
2557 if (r < 0)
2558 return r;
2559
2560 switch (i.type) {
2561
2562 case CREATE_DIRECTORY:
2563 case CREATE_SUBVOLUME:
2564 case CREATE_SUBVOLUME_INHERIT_QUOTA:
2565 case CREATE_SUBVOLUME_NEW_QUOTA:
2566 case EMPTY_DIRECTORY:
2567 case TRUNCATE_DIRECTORY:
2568 case CREATE_FIFO:
2569 case IGNORE_PATH:
2570 case IGNORE_DIRECTORY_PATH:
2571 case REMOVE_PATH:
2572 case RECURSIVE_REMOVE_PATH:
2573 case ADJUST_MODE:
2574 case RELABEL_PATH:
2575 case RECURSIVE_RELABEL_PATH:
2576 if (i.argument)
2577 log_warning("[%s:%u] %c lines don't take argument fields, ignoring.", fname, line, i.type);
2578
2579 break;
2580
2581 case CREATE_FILE:
2582 case TRUNCATE_FILE:
2583 break;
2584
2585 case CREATE_SYMLINK:
2586 if (!i.argument) {
2587 i.argument = strappend("/usr/share/factory/", i.path);
2588 if (!i.argument)
2589 return log_oom();
2590 }
2591 break;
2592
2593 case WRITE_FILE:
2594 if (!i.argument) {
2595 *invalid_config = true;
2596 log_error("[%s:%u] Write file requires argument.", fname, line);
2597 return -EBADMSG;
2598 }
2599 break;
2600
2601 case COPY_FILES:
2602 if (!i.argument) {
2603 i.argument = strappend("/usr/share/factory/", i.path);
2604 if (!i.argument)
2605 return log_oom();
2606 } else if (!path_is_absolute(i.argument)) {
2607 *invalid_config = true;
2608 log_error("[%s:%u] Source path is not absolute.", fname, line);
2609 return -EBADMSG;
2610 }
2611
2612 path_simplify(i.argument, false);
2613 break;
2614
2615 case CREATE_CHAR_DEVICE:
2616 case CREATE_BLOCK_DEVICE:
2617 if (!i.argument) {
2618 *invalid_config = true;
2619 log_error("[%s:%u] Device file requires argument.", fname, line);
2620 return -EBADMSG;
2621 }
2622
2623 r = parse_dev(i.argument, &i.major_minor);
2624 if (r < 0) {
2625 *invalid_config = true;
2626 log_error_errno(r, "[%s:%u] Can't parse device file major/minor '%s'.", fname, line, i.argument);
2627 return -EBADMSG;
2628 }
2629
2630 break;
2631
2632 case SET_XATTR:
2633 case RECURSIVE_SET_XATTR:
2634 if (!i.argument) {
2635 *invalid_config = true;
2636 log_error("[%s:%u] Set extended attribute requires argument.", fname, line);
2637 return -EBADMSG;
2638 }
2639 r = parse_xattrs_from_arg(&i);
2640 if (r < 0)
2641 return r;
2642 break;
2643
2644 case SET_ACL:
2645 case RECURSIVE_SET_ACL:
2646 if (!i.argument) {
2647 *invalid_config = true;
2648 log_error("[%s:%u] Set ACLs requires argument.", fname, line);
2649 return -EBADMSG;
2650 }
2651 r = parse_acls_from_arg(&i);
2652 if (r < 0)
2653 return r;
2654 break;
2655
2656 case SET_ATTRIBUTE:
2657 case RECURSIVE_SET_ATTRIBUTE:
2658 if (!i.argument) {
2659 *invalid_config = true;
2660 log_error("[%s:%u] Set file attribute requires argument.", fname, line);
2661 return -EBADMSG;
2662 }
2663 r = parse_attribute_from_arg(&i);
2664 if (IN_SET(r, -EINVAL, -EBADSLT))
2665 *invalid_config = true;
2666 if (r < 0)
2667 return r;
2668 break;
2669
2670 default:
2671 log_error("[%s:%u] Unknown command type '%c'.", fname, line, (char) i.type);
2672 *invalid_config = true;
2673 return -EBADMSG;
2674 }
2675
2676 if (!path_is_absolute(i.path)) {
2677 log_error("[%s:%u] Path '%s' not absolute.", fname, line, i.path);
2678 *invalid_config = true;
2679 return -EBADMSG;
2680 }
2681
2682 path_simplify(i.path, false);
2683
2684 if (!should_include_path(i.path))
2685 return 0;
2686
2687 r = specifier_expansion_from_arg(&i);
2688 if (r == -ENXIO)
2689 return log_unresolvable_specifier(fname, line);
2690 if (r < 0) {
2691 if (IN_SET(r, -EINVAL, -EBADSLT))
2692 *invalid_config = true;
2693 return log_error_errno(r, "[%s:%u] Failed to substitute specifiers in argument: %m",
2694 fname, line);
2695 }
2696
2697 if (arg_root) {
2698 char *p;
2699
2700 p = prefix_root(arg_root, i.path);
2701 if (!p)
2702 return log_oom();
2703
2704 free_and_replace(i.path, p);
2705 }
2706
2707 if (!isempty(user) && !streq(user, "-")) {
2708 const char *u = user;
2709
2710 r = get_user_creds(&u, &i.uid, NULL, NULL, NULL, USER_CREDS_ALLOW_MISSING);
2711 if (r < 0) {
2712 *invalid_config = true;
2713 return log_error_errno(r, "[%s:%u] Unknown user '%s'.", fname, line, user);
2714 }
2715
2716 i.uid_set = true;
2717 }
2718
2719 if (!isempty(group) && !streq(group, "-")) {
2720 const char *g = group;
2721
2722 r = get_group_creds(&g, &i.gid, USER_CREDS_ALLOW_MISSING);
2723 if (r < 0) {
2724 *invalid_config = true;
2725 log_error("[%s:%u] Unknown group '%s'.", fname, line, group);
2726 return r;
2727 }
2728
2729 i.gid_set = true;
2730 }
2731
2732 if (!isempty(mode) && !streq(mode, "-")) {
2733 const char *mm = mode;
2734 unsigned m;
2735
2736 if (*mm == '~') {
2737 i.mask_perms = true;
2738 mm++;
2739 }
2740
2741 if (parse_mode(mm, &m) < 0) {
2742 *invalid_config = true;
2743 log_error("[%s:%u] Invalid mode '%s'.", fname, line, mode);
2744 return -EBADMSG;
2745 }
2746
2747 i.mode = m;
2748 i.mode_set = true;
2749 } else
2750 i.mode = IN_SET(i.type, CREATE_DIRECTORY, TRUNCATE_DIRECTORY, CREATE_SUBVOLUME, CREATE_SUBVOLUME_INHERIT_QUOTA, CREATE_SUBVOLUME_NEW_QUOTA) ? 0755 : 0644;
2751
2752 if (!isempty(age) && !streq(age, "-")) {
2753 const char *a = age;
2754
2755 if (*a == '~') {
2756 i.keep_first_level = true;
2757 a++;
2758 }
2759
2760 if (parse_sec(a, &i.age) < 0) {
2761 *invalid_config = true;
2762 log_error("[%s:%u] Invalid age '%s'.", fname, line, age);
2763 return -EBADMSG;
2764 }
2765
2766 i.age_set = true;
2767 }
2768
2769 h = needs_glob(i.type) ? globs : items;
2770
2771 existing = ordered_hashmap_get(h, i.path);
2772 if (existing) {
2773 size_t n;
2774
2775 for (n = 0; n < existing->n_items; n++) {
2776 if (!item_compatible(existing->items + n, &i)) {
2777 log_notice("[%s:%u] Duplicate line for path \"%s\", ignoring.",
2778 fname, line, i.path);
2779 return 0;
2780 }
2781 }
2782 } else {
2783 existing = new0(ItemArray, 1);
2784 if (!existing)
2785 return log_oom();
2786
2787 r = ordered_hashmap_put(h, i.path, existing);
2788 if (r < 0) {
2789 free(existing);
2790 return log_oom();
2791 }
2792 }
2793
2794 if (!GREEDY_REALLOC(existing->items, existing->allocated, existing->n_items + 1))
2795 return log_oom();
2796
2797 existing->items[existing->n_items++] = i;
2798 i = (struct Item) {};
2799
2800 /* Sort item array, to enforce stable ordering of application */
2801 typesafe_qsort(existing->items, existing->n_items, item_compare);
2802
2803 return 0;
2804 }
2805
2806 static int cat_config(char **config_dirs, char **args) {
2807 _cleanup_strv_free_ char **files = NULL;
2808 int r;
2809
2810 r = conf_files_list_with_replacement(arg_root, config_dirs, arg_replace, &files, NULL);
2811 if (r < 0)
2812 return r;
2813
2814 return cat_files(NULL, files, 0);
2815 }
2816
2817 static int help(void) {
2818 _cleanup_free_ char *link = NULL;
2819 int r;
2820
2821 r = terminal_urlify_man("systemd-tmpfiles", "8", &link);
2822 if (r < 0)
2823 return log_oom();
2824
2825 printf("%s [OPTIONS...] [CONFIGURATION FILE...]\n\n"
2826 "Creates, deletes and cleans up volatile and temporary files and directories.\n\n"
2827 " -h --help Show this help\n"
2828 " --user Execute user configuration\n"
2829 " --version Show package version\n"
2830 " --cat-config Show configuration files\n"
2831 " --create Create marked files/directories\n"
2832 " --clean Clean up marked directories\n"
2833 " --remove Remove marked files/directories\n"
2834 " --boot Execute actions only safe at boot\n"
2835 " --prefix=PATH Only apply rules with the specified prefix\n"
2836 " --exclude-prefix=PATH Ignore rules with the specified prefix\n"
2837 " --root=PATH Operate on an alternate filesystem root\n"
2838 " --replace=PATH Treat arguments as replacement for PATH\n"
2839 " --no-pager Do not pipe output into a pager\n"
2840 "\nSee the %s for details.\n"
2841 , program_invocation_short_name
2842 , link
2843 );
2844
2845 return 0;
2846 }
2847
2848 static int parse_argv(int argc, char *argv[]) {
2849
2850 enum {
2851 ARG_VERSION = 0x100,
2852 ARG_CAT_CONFIG,
2853 ARG_USER,
2854 ARG_CREATE,
2855 ARG_CLEAN,
2856 ARG_REMOVE,
2857 ARG_BOOT,
2858 ARG_PREFIX,
2859 ARG_EXCLUDE_PREFIX,
2860 ARG_ROOT,
2861 ARG_REPLACE,
2862 ARG_NO_PAGER,
2863 };
2864
2865 static const struct option options[] = {
2866 { "help", no_argument, NULL, 'h' },
2867 { "user", no_argument, NULL, ARG_USER },
2868 { "version", no_argument, NULL, ARG_VERSION },
2869 { "cat-config", no_argument, NULL, ARG_CAT_CONFIG },
2870 { "create", no_argument, NULL, ARG_CREATE },
2871 { "clean", no_argument, NULL, ARG_CLEAN },
2872 { "remove", no_argument, NULL, ARG_REMOVE },
2873 { "boot", no_argument, NULL, ARG_BOOT },
2874 { "prefix", required_argument, NULL, ARG_PREFIX },
2875 { "exclude-prefix", required_argument, NULL, ARG_EXCLUDE_PREFIX },
2876 { "root", required_argument, NULL, ARG_ROOT },
2877 { "replace", required_argument, NULL, ARG_REPLACE },
2878 { "no-pager", no_argument, NULL, ARG_NO_PAGER },
2879 {}
2880 };
2881
2882 int c, r;
2883
2884 assert(argc >= 0);
2885 assert(argv);
2886
2887 while ((c = getopt_long(argc, argv, "h", options, NULL)) >= 0)
2888
2889 switch (c) {
2890
2891 case 'h':
2892 return help();
2893
2894 case ARG_VERSION:
2895 return version();
2896
2897 case ARG_CAT_CONFIG:
2898 arg_cat_config = true;
2899 break;
2900
2901 case ARG_USER:
2902 arg_user = true;
2903 break;
2904
2905 case ARG_CREATE:
2906 arg_operation |= OPERATION_CREATE;
2907 break;
2908
2909 case ARG_CLEAN:
2910 arg_operation |= OPERATION_CLEAN;
2911 break;
2912
2913 case ARG_REMOVE:
2914 arg_operation |= OPERATION_REMOVE;
2915 break;
2916
2917 case ARG_BOOT:
2918 arg_boot = true;
2919 break;
2920
2921 case ARG_PREFIX:
2922 if (strv_push(&arg_include_prefixes, optarg) < 0)
2923 return log_oom();
2924 break;
2925
2926 case ARG_EXCLUDE_PREFIX:
2927 if (strv_push(&arg_exclude_prefixes, optarg) < 0)
2928 return log_oom();
2929 break;
2930
2931 case ARG_ROOT:
2932 r = parse_path_argument_and_warn(optarg, true, &arg_root);
2933 if (r < 0)
2934 return r;
2935 break;
2936
2937 case ARG_REPLACE:
2938 if (!path_is_absolute(optarg) ||
2939 !endswith(optarg, ".conf"))
2940 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
2941 "The argument to --replace= must an absolute path to a config file");
2942
2943 arg_replace = optarg;
2944 break;
2945
2946 case ARG_NO_PAGER:
2947 arg_pager_flags |= PAGER_DISABLE;
2948 break;
2949
2950 case '?':
2951 return -EINVAL;
2952
2953 default:
2954 assert_not_reached("Unhandled option");
2955 }
2956
2957 if (arg_operation == 0 && !arg_cat_config)
2958 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
2959 "You need to specify at least one of --clean, --create or --remove.");
2960
2961 if (arg_replace && arg_cat_config)
2962 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
2963 "Option --replace= is not supported with --cat-config");
2964
2965 if (arg_replace && optind >= argc)
2966 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
2967 "When --replace= is given, some configuration items must be specified");
2968
2969 return 1;
2970 }
2971
2972 static int read_config_file(char **config_dirs, const char *fn, bool ignore_enoent, bool *invalid_config) {
2973 _cleanup_fclose_ FILE *_f = NULL;
2974 Iterator iterator;
2975 unsigned v = 0;
2976 FILE *f;
2977 Item *i;
2978 int r = 0;
2979
2980 assert(fn);
2981
2982 if (streq(fn, "-")) {
2983 log_debug("Reading config from stdin…");
2984 fn = "<stdin>";
2985 f = stdin;
2986 } else {
2987 r = search_and_fopen(fn, "re", arg_root, (const char**) config_dirs, &_f);
2988 if (r < 0) {
2989 if (ignore_enoent && r == -ENOENT) {
2990 log_debug_errno(r, "Failed to open \"%s\", ignoring: %m", fn);
2991 return 0;
2992 }
2993
2994 return log_error_errno(r, "Failed to open '%s': %m", fn);
2995 }
2996 log_debug("Reading config file \"%s\"…", fn);
2997 f = _f;
2998 }
2999
3000 for (;;) {
3001 _cleanup_free_ char *line = NULL;
3002 bool invalid_line = false;
3003 char *l;
3004 int k;
3005
3006 k = read_line(f, LONG_LINE_MAX, &line);
3007 if (k < 0)
3008 return log_error_errno(k, "Failed to read '%s': %m", fn);
3009 if (k == 0)
3010 break;
3011
3012 v++;
3013
3014 l = strstrip(line);
3015 if (IN_SET(*l, 0, '#'))
3016 continue;
3017
3018 k = parse_line(fn, v, l, &invalid_line);
3019 if (k < 0) {
3020 if (invalid_line)
3021 /* Allow reporting with a special code if the caller requested this */
3022 *invalid_config = true;
3023 else if (r == 0)
3024 /* The first error becomes our return value */
3025 r = k;
3026 }
3027 }
3028
3029 /* we have to determine age parameter for each entry of type X */
3030 ORDERED_HASHMAP_FOREACH(i, globs, iterator) {
3031 Iterator iter;
3032 Item *j, *candidate_item = NULL;
3033
3034 if (i->type != IGNORE_DIRECTORY_PATH)
3035 continue;
3036
3037 ORDERED_HASHMAP_FOREACH(j, items, iter) {
3038 if (!IN_SET(j->type, CREATE_DIRECTORY, TRUNCATE_DIRECTORY, CREATE_SUBVOLUME, CREATE_SUBVOLUME_INHERIT_QUOTA, CREATE_SUBVOLUME_NEW_QUOTA))
3039 continue;
3040
3041 if (path_equal(j->path, i->path)) {
3042 candidate_item = j;
3043 break;
3044 }
3045
3046 if ((!candidate_item && path_startswith(i->path, j->path)) ||
3047 (candidate_item && path_startswith(j->path, candidate_item->path) && (fnmatch(i->path, j->path, FNM_PATHNAME | FNM_PERIOD) == 0)))
3048 candidate_item = j;
3049 }
3050
3051 if (candidate_item && candidate_item->age_set) {
3052 i->age = candidate_item->age;
3053 i->age_set = true;
3054 }
3055 }
3056
3057 if (ferror(f)) {
3058 log_error_errno(errno, "Failed to read from file %s: %m", fn);
3059 if (r == 0)
3060 r = -EIO;
3061 }
3062
3063 return r;
3064 }
3065
3066 static int parse_arguments(char **config_dirs, char **args, bool *invalid_config) {
3067 char **arg;
3068 int r;
3069
3070 STRV_FOREACH(arg, args) {
3071 r = read_config_file(config_dirs, *arg, false, invalid_config);
3072 if (r < 0)
3073 return r;
3074 }
3075
3076 return 0;
3077 }
3078
3079 static int read_config_files(char **config_dirs, char **args, bool *invalid_config) {
3080 _cleanup_strv_free_ char **files = NULL;
3081 _cleanup_free_ char *p = NULL;
3082 char **f;
3083 int r;
3084
3085 r = conf_files_list_with_replacement(arg_root, config_dirs, arg_replace, &files, &p);
3086 if (r < 0)
3087 return r;
3088
3089 STRV_FOREACH(f, files)
3090 if (p && path_equal(*f, p)) {
3091 log_debug("Parsing arguments at position \"%s\"…", *f);
3092
3093 r = parse_arguments(config_dirs, args, invalid_config);
3094 if (r < 0)
3095 return r;
3096 } else
3097 /* Just warn, ignore result otherwise.
3098 * read_config_file() has some debug output, so no need to print anything. */
3099 (void) read_config_file(config_dirs, *f, true, invalid_config);
3100
3101 return 0;
3102 }
3103
3104 static int link_parent(ItemArray *a) {
3105 const char *path;
3106 char *prefix;
3107 int r;
3108
3109 assert(a);
3110
3111 /* Finds the closest "parent" item array for the specified item array. Then registers the specified item array
3112 * as child of it, and fills the parent in, linking them both ways. This allows us to later create parents
3113 * before their children, and clean up/remove children before their parents. */
3114
3115 if (a->n_items <= 0)
3116 return 0;
3117
3118 path = a->items[0].path;
3119 prefix = newa(char, strlen(path) + 1);
3120 PATH_FOREACH_PREFIX(prefix, path) {
3121 ItemArray *j;
3122
3123 j = ordered_hashmap_get(items, prefix);
3124 if (!j)
3125 j = ordered_hashmap_get(globs, prefix);
3126 if (j) {
3127 r = set_ensure_allocated(&j->children, NULL);
3128 if (r < 0)
3129 return log_oom();
3130
3131 r = set_put(j->children, a);
3132 if (r < 0)
3133 return log_oom();
3134
3135 a->parent = j;
3136 return 1;
3137 }
3138 }
3139
3140 return 0;
3141 }
3142
3143 DEFINE_PRIVATE_HASH_OPS_WITH_VALUE_DESTRUCTOR(item_array_hash_ops, char, string_hash_func, string_compare_func,
3144 ItemArray, item_array_free);
3145
3146 static int run(int argc, char *argv[]) {
3147 _cleanup_strv_free_ char **config_dirs = NULL;
3148 bool invalid_config = false;
3149 Iterator iterator;
3150 ItemArray *a;
3151 enum {
3152 PHASE_REMOVE_AND_CLEAN,
3153 PHASE_CREATE,
3154 _PHASE_MAX
3155 } phase;
3156 int r, k;
3157
3158 r = parse_argv(argc, argv);
3159 if (r <= 0)
3160 return r;
3161
3162 log_setup_service();
3163
3164 /* Descending down file system trees might take a lot of fds */
3165 (void) rlimit_nofile_bump(HIGH_RLIMIT_NOFILE);
3166
3167 if (arg_user) {
3168 r = user_config_paths(&config_dirs);
3169 if (r < 0)
3170 return log_error_errno(r, "Failed to initialize configuration directory list: %m");
3171 } else {
3172 config_dirs = strv_split_nulstr(CONF_PATHS_NULSTR("tmpfiles.d"));
3173 if (!config_dirs)
3174 return log_oom();
3175 }
3176
3177 if (DEBUG_LOGGING) {
3178 _cleanup_free_ char *t = NULL;
3179
3180 t = strv_join(config_dirs, "\n\t");
3181 if (t)
3182 log_debug("Looking for configuration files in (higher priority first):\n\t%s", t);
3183 }
3184
3185 if (arg_cat_config) {
3186 (void) pager_open(arg_pager_flags);
3187
3188 return cat_config(config_dirs, argv + optind);
3189 }
3190
3191 umask(0022);
3192
3193 mac_selinux_init();
3194
3195 items = ordered_hashmap_new(&item_array_hash_ops);
3196 globs = ordered_hashmap_new(&item_array_hash_ops);
3197 if (!items || !globs)
3198 return log_oom();
3199
3200 /* If command line arguments are specified along with --replace, read all
3201 * configuration files and insert the positional arguments at the specified
3202 * place. Otherwise, if command line arguments are specified, execute just
3203 * them, and finally, without --replace= or any positional arguments, just
3204 * read configuration and execute it.
3205 */
3206 if (arg_replace || optind >= argc)
3207 r = read_config_files(config_dirs, argv + optind, &invalid_config);
3208 else
3209 r = parse_arguments(config_dirs, argv + optind, &invalid_config);
3210 if (r < 0)
3211 return r;
3212
3213 /* Let's now link up all child/parent relationships */
3214 ORDERED_HASHMAP_FOREACH(a, items, iterator) {
3215 r = link_parent(a);
3216 if (r < 0)
3217 return r;
3218 }
3219 ORDERED_HASHMAP_FOREACH(a, globs, iterator) {
3220 r = link_parent(a);
3221 if (r < 0)
3222 return r;
3223 }
3224
3225 /* If multiple operations are requested, let's first run the remove/clean operations, and only then the create
3226 * operations. i.e. that we first clean out the platform we then build on. */
3227 for (phase = 0; phase < _PHASE_MAX; phase++) {
3228 OperationMask op;
3229
3230 if (phase == PHASE_REMOVE_AND_CLEAN)
3231 op = arg_operation & (OPERATION_REMOVE|OPERATION_CLEAN);
3232 else if (phase == PHASE_CREATE)
3233 op = arg_operation & OPERATION_CREATE;
3234 else
3235 assert_not_reached("unexpected phase");
3236
3237 if (op == 0) /* Nothing requested in this phase */
3238 continue;
3239
3240 /* The non-globbing ones usually create things, hence we apply them first */
3241 ORDERED_HASHMAP_FOREACH(a, items, iterator) {
3242 k = process_item_array(a, op);
3243 if (k < 0 && r >= 0)
3244 r = k;
3245 }
3246
3247 /* The globbing ones usually alter things, hence we apply them second. */
3248 ORDERED_HASHMAP_FOREACH(a, globs, iterator) {
3249 k = process_item_array(a, op);
3250 if (k < 0 && r >= 0)
3251 r = k;
3252 }
3253 }
3254
3255 if (ERRNO_IS_RESOURCE(-r))
3256 return r;
3257 if (invalid_config)
3258 return EX_DATAERR;
3259 if (r < 0)
3260 return EX_CANTCREAT;
3261 return 0;
3262 }
3263
3264 DEFINE_MAIN_FUNCTION_WITH_POSITIVE_FAILURE(run);
Unnamed repository; edit this file 'description' to name the repository.