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Merge pull request #13423 from pwithnall/12035-session-time-limits
[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 append_or_force:1;
139
140 bool allow_failure:1;
141
142 OperationMask done;
143 } Item;
144
145 typedef struct ItemArray {
146 Item *items;
147 size_t n_items;
148 size_t allocated;
149
150 struct ItemArray *parent;
151 Set *children;
152 } ItemArray;
153
154 typedef enum DirectoryType {
155 DIRECTORY_RUNTIME,
156 DIRECTORY_STATE,
157 DIRECTORY_CACHE,
158 DIRECTORY_LOGS,
159 _DIRECTORY_TYPE_MAX,
160 } DirectoryType;
161
162 static bool arg_cat_config = false;
163 static bool arg_user = false;
164 static OperationMask arg_operation = 0;
165 static bool arg_boot = false;
166 static PagerFlags arg_pager_flags = 0;
167
168 static char **arg_include_prefixes = NULL;
169 static char **arg_exclude_prefixes = NULL;
170 static char *arg_root = NULL;
171 static char *arg_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 DIR* xopendirat_nomod(int dirfd, const char *path) {
465 DIR *dir;
466
467 dir = xopendirat(dirfd, path, O_NOFOLLOW|O_NOATIME);
468 if (dir)
469 return dir;
470
471 log_debug_errno(errno, "Cannot open %sdirectory \"%s\": %m", dirfd == AT_FDCWD ? "" : "sub", path);
472 if (errno != EPERM)
473 return NULL;
474
475 dir = xopendirat(dirfd, path, O_NOFOLLOW);
476 if (!dir)
477 log_debug_errno(errno, "Cannot open %sdirectory \"%s\": %m", dirfd == AT_FDCWD ? "" : "sub", path);
478
479 return dir;
480 }
481
482 static DIR* opendir_nomod(const char *path) {
483 return xopendirat_nomod(AT_FDCWD, path);
484 }
485
486 static int dir_cleanup(
487 Item *i,
488 const char *p,
489 DIR *d,
490 const struct stat *ds,
491 usec_t cutoff,
492 dev_t rootdev,
493 bool mountpoint,
494 int maxdepth,
495 bool keep_this_level) {
496
497 struct dirent *dent;
498 bool deleted = false;
499 int r = 0;
500
501 FOREACH_DIRENT_ALL(dent, d, break) {
502 struct stat s;
503 usec_t age;
504 _cleanup_free_ char *sub_path = NULL;
505
506 if (dot_or_dot_dot(dent->d_name))
507 continue;
508
509 if (fstatat(dirfd(d), dent->d_name, &s, AT_SYMLINK_NOFOLLOW) < 0) {
510 if (errno == ENOENT)
511 continue;
512
513 /* FUSE, NFS mounts, SELinux might return EACCES */
514 r = log_full_errno(errno == EACCES ? LOG_DEBUG : LOG_ERR, errno,
515 "stat(%s/%s) failed: %m", p, dent->d_name);
516 continue;
517 }
518
519 /* Stay on the same filesystem */
520 if (s.st_dev != rootdev) {
521 log_debug("Ignoring \"%s/%s\": different filesystem.", p, dent->d_name);
522 continue;
523 }
524
525 /* Try to detect bind mounts of the same filesystem instance; they
526 * do not differ in device major/minors. This type of query is not
527 * supported on all kernels or filesystem types though. */
528 if (S_ISDIR(s.st_mode)) {
529 int q;
530
531 q = fd_is_mount_point(dirfd(d), dent->d_name, 0);
532 if (q < 0)
533 log_debug_errno(q, "Failed to determine whether \"%s/%s\" is a mount point, ignoring: %m", p, dent->d_name);
534 else if (q > 0) {
535 log_debug("Ignoring \"%s/%s\": different mount of the same filesystem.", p, dent->d_name);
536 continue;
537 }
538 }
539
540 sub_path = path_join(p, dent->d_name);
541 if (!sub_path) {
542 r = log_oom();
543 goto finish;
544 }
545
546 /* Is there an item configured for this path? */
547 if (ordered_hashmap_get(items, sub_path)) {
548 log_debug("Ignoring \"%s\": a separate entry exists.", sub_path);
549 continue;
550 }
551
552 if (find_glob(globs, sub_path)) {
553 log_debug("Ignoring \"%s\": a separate glob exists.", sub_path);
554 continue;
555 }
556
557 if (S_ISDIR(s.st_mode)) {
558 _cleanup_closedir_ DIR *sub_dir = NULL;
559
560 if (mountpoint &&
561 streq(dent->d_name, "lost+found") &&
562 s.st_uid == 0) {
563 log_debug("Ignoring directory \"%s\".", sub_path);
564 continue;
565 }
566
567 if (maxdepth <= 0)
568 log_warning("Reached max depth on \"%s\".", sub_path);
569 else {
570 int q;
571
572 sub_dir = xopendirat_nomod(dirfd(d), dent->d_name);
573 if (!sub_dir) {
574 if (errno != ENOENT)
575 r = log_warning_errno(errno, "Opening directory \"%s\" failed, ignoring: %m", sub_path);
576
577 continue;
578 }
579
580 if (flock(dirfd(sub_dir), LOCK_EX|LOCK_NB) < 0) {
581 log_debug_errno(errno, "Couldn't acquire shared BSD lock on directory \"%s\", skipping: %m", p);
582 continue;
583 }
584
585 q = dir_cleanup(i, sub_path, sub_dir, &s, cutoff, rootdev, false, maxdepth-1, false);
586 if (q < 0)
587 r = q;
588 }
589
590 /* Note: if you are wondering why we don't support the sticky bit for excluding
591 * directories from cleaning like we do it for other file system objects: well, the
592 * sticky bit already has a meaning for directories, so we don't want to overload
593 * that. */
594
595 if (keep_this_level) {
596 log_debug("Keeping directory \"%s\".", sub_path);
597 continue;
598 }
599
600 /* Ignore ctime, we change it when deleting */
601 age = timespec_load(&s.st_mtim);
602 if (age >= cutoff) {
603 char a[FORMAT_TIMESTAMP_MAX];
604 /* Follows spelling in stat(1). */
605 log_debug("Directory \"%s\": modify time %s is too new.",
606 sub_path,
607 format_timestamp_us(a, sizeof(a), age));
608 continue;
609 }
610
611 age = timespec_load(&s.st_atim);
612 if (age >= cutoff) {
613 char a[FORMAT_TIMESTAMP_MAX];
614 log_debug("Directory \"%s\": access time %s is too new.",
615 sub_path,
616 format_timestamp_us(a, sizeof(a), age));
617 continue;
618 }
619
620 log_debug("Removing directory \"%s\".", sub_path);
621 if (unlinkat(dirfd(d), dent->d_name, AT_REMOVEDIR) < 0)
622 if (!IN_SET(errno, ENOENT, ENOTEMPTY))
623 r = log_warning_errno(errno, "Failed to remove directory \"%s\", ignoring: %m", sub_path);
624
625 } else {
626 /* Skip files for which the sticky bit is set. These are semantics we define, and are
627 * unknown elsewhere. See XDG_RUNTIME_DIR specification for details. */
628 if (s.st_mode & S_ISVTX) {
629 log_debug("Skipping \"%s\": sticky bit set.", sub_path);
630 continue;
631 }
632
633 if (mountpoint &&
634 S_ISREG(s.st_mode) &&
635 s.st_uid == 0 &&
636 STR_IN_SET(dent->d_name,
637 ".journal",
638 "aquota.user",
639 "aquota.group")) {
640 log_debug("Skipping \"%s\".", sub_path);
641 continue;
642 }
643
644 /* Ignore sockets that are listed in /proc/net/unix */
645 if (S_ISSOCK(s.st_mode) && unix_socket_alive(sub_path)) {
646 log_debug("Skipping \"%s\": live socket.", sub_path);
647 continue;
648 }
649
650 /* Ignore device nodes */
651 if (S_ISCHR(s.st_mode) || S_ISBLK(s.st_mode)) {
652 log_debug("Skipping \"%s\": a device.", sub_path);
653 continue;
654 }
655
656 /* Keep files on this level around if this is requested */
657 if (keep_this_level) {
658 log_debug("Keeping \"%s\".", sub_path);
659 continue;
660 }
661
662 age = timespec_load(&s.st_mtim);
663 if (age >= cutoff) {
664 char a[FORMAT_TIMESTAMP_MAX];
665 /* Follows spelling in stat(1). */
666 log_debug("File \"%s\": modify time %s is too new.",
667 sub_path,
668 format_timestamp_us(a, sizeof(a), age));
669 continue;
670 }
671
672 age = timespec_load(&s.st_atim);
673 if (age >= cutoff) {
674 char a[FORMAT_TIMESTAMP_MAX];
675 log_debug("File \"%s\": access time %s is too new.",
676 sub_path,
677 format_timestamp_us(a, sizeof(a), age));
678 continue;
679 }
680
681 age = timespec_load(&s.st_ctim);
682 if (age >= cutoff) {
683 char a[FORMAT_TIMESTAMP_MAX];
684 log_debug("File \"%s\": change time %s is too new.",
685 sub_path,
686 format_timestamp_us(a, sizeof(a), age));
687 continue;
688 }
689
690 log_debug("Removing \"%s\".", sub_path);
691 if (unlinkat(dirfd(d), dent->d_name, 0) < 0)
692 if (errno != ENOENT)
693 r = log_warning_errno(errno, "Failed to remove \"%s\", ignoring: %m", sub_path);
694
695 deleted = true;
696 }
697 }
698
699 finish:
700 if (deleted) {
701 char a[FORMAT_TIMESTAMP_MAX], b[FORMAT_TIMESTAMP_MAX];
702 usec_t age1, age2;
703
704 age1 = timespec_load(&ds->st_atim);
705 age2 = timespec_load(&ds->st_mtim);
706
707 log_debug("Restoring access and modification time on \"%s\": %s, %s",
708 p,
709 format_timestamp_us(a, sizeof(a), age1),
710 format_timestamp_us(b, sizeof(b), age2));
711
712 /* Restore original directory timestamps */
713 if (futimens(dirfd(d), (struct timespec[]) {
714 ds->st_atim,
715 ds->st_mtim }) < 0)
716 log_warning_errno(errno, "Failed to revert timestamps of '%s', ignoring: %m", p);
717 }
718
719 return r;
720 }
721
722 static bool dangerous_hardlinks(void) {
723 _cleanup_free_ char *value = NULL;
724 static int cached = -1;
725 int r;
726
727 /* Check whether the fs.protected_hardlinks sysctl is on. If we can't determine it we assume its off, as that's
728 * what the upstream default is. */
729
730 if (cached >= 0)
731 return cached;
732
733 r = read_one_line_file("/proc/sys/fs/protected_hardlinks", &value);
734 if (r < 0) {
735 log_debug_errno(r, "Failed to read fs.protected_hardlinks sysctl: %m");
736 return true;
737 }
738
739 r = parse_boolean(value);
740 if (r < 0) {
741 log_debug_errno(r, "Failed to parse fs.protected_hardlinks sysctl: %m");
742 return true;
743 }
744
745 cached = r == 0;
746 return cached;
747 }
748
749 static bool hardlink_vulnerable(const struct stat *st) {
750 assert(st);
751
752 return !S_ISDIR(st->st_mode) && st->st_nlink > 1 && dangerous_hardlinks();
753 }
754
755 static mode_t process_mask_perms(mode_t mode, mode_t current) {
756
757 if ((current & 0111) == 0)
758 mode &= ~0111;
759 if ((current & 0222) == 0)
760 mode &= ~0222;
761 if ((current & 0444) == 0)
762 mode &= ~0444;
763 if (!S_ISDIR(current))
764 mode &= ~07000; /* remove sticky/sgid/suid bit, unless directory */
765
766 return mode;
767 }
768
769 static int fd_set_perms(Item *i, int fd, const char *path, const struct stat *st) {
770 struct stat stbuf;
771 mode_t new_mode;
772 bool do_chown;
773
774 assert(i);
775 assert(fd);
776 assert(path);
777
778 if (!i->mode_set && !i->uid_set && !i->gid_set)
779 goto shortcut;
780
781 if (!st) {
782 if (fstat(fd, &stbuf) < 0)
783 return log_error_errno(errno, "fstat(%s) failed: %m", path);
784 st = &stbuf;
785 }
786
787 if (hardlink_vulnerable(st))
788 return log_error_errno(SYNTHETIC_ERRNO(EPERM),
789 "Refusing to set permissions on hardlinked file %s while the fs.protected_hardlinks sysctl is turned off.",
790 path);
791
792 /* Do we need a chown()? */
793 do_chown =
794 (i->uid_set && i->uid != st->st_uid) ||
795 (i->gid_set && i->gid != st->st_gid);
796
797 /* Calculate the mode to apply */
798 new_mode = i->mode_set ? (i->mask_perms ?
799 process_mask_perms(i->mode, st->st_mode) :
800 i->mode) :
801 (st->st_mode & 07777);
802
803 if (i->mode_set && do_chown) {
804 /* Before we issue the chmod() let's reduce the access mode to the common bits of the old and
805 * the new mode. That way there's no time window where the file exists under the old owner
806 * with more than the old access modes — and not under the new owner with more than the new
807 * access modes either. */
808
809 if (S_ISLNK(st->st_mode))
810 log_debug("Skipping temporary mode fix for symlink %s.", path);
811 else {
812 mode_t m = new_mode & st->st_mode; /* Mask new mode by old mode */
813
814 if (((m ^ st->st_mode) & 07777) == 0)
815 log_debug("\"%s\" matches temporary mode %o already.", path, m);
816 else {
817 log_debug("Temporarily changing \"%s\" to mode %o.", path, m);
818 if (fchmod_opath(fd, m) < 0)
819 return log_error_errno(errno, "fchmod() of %s failed: %m", path);
820 }
821 }
822 }
823
824 if (do_chown) {
825 log_debug("Changing \"%s\" to owner "UID_FMT":"GID_FMT,
826 path,
827 i->uid_set ? i->uid : UID_INVALID,
828 i->gid_set ? i->gid : GID_INVALID);
829
830 if (fchownat(fd,
831 "",
832 i->uid_set ? i->uid : UID_INVALID,
833 i->gid_set ? i->gid : GID_INVALID,
834 AT_EMPTY_PATH) < 0)
835 return log_error_errno(errno, "fchownat() of %s failed: %m", path);
836 }
837
838 /* Now, apply the final mode. We do this in two cases: when the user set a mode explicitly, or after a
839 * chown(), since chown()'s mangle the access mode in regards to sgid/suid in some conditions. */
840 if (i->mode_set || do_chown) {
841 if (S_ISLNK(st->st_mode))
842 log_debug("Skipping mode fix for symlink %s.", path);
843 else {
844 /* Check if the chmod() is unnecessary. Note that if we did a chown() before we always
845 * chmod() here again, since it might have mangled the bits. */
846 if (!do_chown && ((new_mode ^ st->st_mode) & 07777) == 0)
847 log_debug("\"%s\" matches mode %o already.", path, new_mode);
848 else {
849 log_debug("Changing \"%s\" to mode %o.", path, new_mode);
850 if (fchmod_opath(fd, new_mode) < 0)
851 return log_error_errno(errno, "fchmod() of %s failed: %m", path);
852 }
853 }
854 }
855
856 shortcut:
857 return label_fix(path, 0);
858 }
859
860 static int path_open_parent_safe(const char *path) {
861 _cleanup_free_ char *dn = NULL;
862 int r, fd;
863
864 if (path_equal(path, "/") || !path_is_normalized(path))
865 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
866 "Failed to open parent of '%s': invalid path.",
867 path);
868
869 dn = dirname_malloc(path);
870 if (!dn)
871 return log_oom();
872
873 r = chase_symlinks(dn, arg_root, CHASE_SAFE|CHASE_WARN, NULL, &fd);
874 if (r < 0 && r != -ENOLINK)
875 return log_error_errno(r, "Failed to validate path %s: %m", path);
876
877 return r < 0 ? r : fd;
878 }
879
880 static int path_open_safe(const char *path) {
881 int r, fd;
882
883 /* path_open_safe() returns a file descriptor opened with O_PATH after
884 * verifying that the path doesn't contain unsafe transitions, except
885 * for its final component as the function does not follow symlink. */
886
887 assert(path);
888
889 if (!path_is_normalized(path))
890 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
891 "Failed to open invalid path '%s'.",
892 path);
893
894 r = chase_symlinks(path, arg_root, CHASE_SAFE|CHASE_WARN|CHASE_NOFOLLOW, NULL, &fd);
895 if (r < 0 && r != -ENOLINK)
896 return log_error_errno(r, "Failed to validate path %s: %m", path);
897
898 return r < 0 ? r : fd;
899 }
900
901 static int path_set_perms(Item *i, const char *path) {
902 _cleanup_close_ int fd = -1;
903
904 assert(i);
905 assert(path);
906
907 fd = path_open_safe(path);
908 if (fd < 0)
909 return fd;
910
911 return fd_set_perms(i, fd, path, NULL);
912 }
913
914 static int parse_xattrs_from_arg(Item *i) {
915 const char *p;
916 int r;
917
918 assert(i);
919 assert(i->argument);
920
921 p = i->argument;
922
923 for (;;) {
924 _cleanup_free_ char *name = NULL, *value = NULL, *xattr = NULL;
925
926 r = extract_first_word(&p, &xattr, NULL, EXTRACT_UNQUOTE|EXTRACT_CUNESCAPE);
927 if (r < 0)
928 log_warning_errno(r, "Failed to parse extended attribute '%s', ignoring: %m", p);
929 if (r <= 0)
930 break;
931
932 r = split_pair(xattr, "=", &name, &value);
933 if (r < 0) {
934 log_warning_errno(r, "Failed to parse extended attribute, ignoring: %s", xattr);
935 continue;
936 }
937
938 if (isempty(name) || isempty(value)) {
939 log_warning("Malformed extended attribute found, ignoring: %s", xattr);
940 continue;
941 }
942
943 if (strv_push_pair(&i->xattrs, name, value) < 0)
944 return log_oom();
945
946 name = value = NULL;
947 }
948
949 return 0;
950 }
951
952 static int fd_set_xattrs(Item *i, int fd, const char *path, const struct stat *st) {
953 char procfs_path[STRLEN("/proc/self/fd/") + DECIMAL_STR_MAX(int)];
954 char **name, **value;
955
956 assert(i);
957 assert(fd);
958 assert(path);
959
960 xsprintf(procfs_path, "/proc/self/fd/%i", fd);
961
962 STRV_FOREACH_PAIR(name, value, i->xattrs) {
963 log_debug("Setting extended attribute '%s=%s' on %s.", *name, *value, path);
964 if (setxattr(procfs_path, *name, *value, strlen(*value), 0) < 0)
965 return log_error_errno(errno, "Setting extended attribute %s=%s on %s failed: %m",
966 *name, *value, path);
967 }
968 return 0;
969 }
970
971 static int path_set_xattrs(Item *i, const char *path) {
972 _cleanup_close_ int fd = -1;
973
974 assert(i);
975 assert(path);
976
977 fd = path_open_safe(path);
978 if (fd < 0)
979 return fd;
980
981 return fd_set_xattrs(i, fd, path, NULL);
982 }
983
984 static int parse_acls_from_arg(Item *item) {
985 #if HAVE_ACL
986 int r;
987
988 assert(item);
989
990 /* If append_or_force (= modify) is set, we will not modify the acl
991 * afterwards, so the mask can be added now if necessary. */
992
993 r = parse_acl(item->argument, &item->acl_access, &item->acl_default, !item->append_or_force);
994 if (r < 0)
995 log_warning_errno(r, "Failed to parse ACL \"%s\": %m. Ignoring", item->argument);
996 #else
997 log_warning_errno(SYNTHETIC_ERRNO(ENOSYS), "ACLs are not supported. Ignoring");
998 #endif
999
1000 return 0;
1001 }
1002
1003 #if HAVE_ACL
1004 static int path_set_acl(const char *path, const char *pretty, acl_type_t type, acl_t acl, bool modify) {
1005 _cleanup_(acl_free_charpp) char *t = NULL;
1006 _cleanup_(acl_freep) acl_t dup = NULL;
1007 int r;
1008
1009 /* Returns 0 for success, positive error if already warned,
1010 * negative error otherwise. */
1011
1012 if (modify) {
1013 r = acls_for_file(path, type, acl, &dup);
1014 if (r < 0)
1015 return r;
1016
1017 r = calc_acl_mask_if_needed(&dup);
1018 if (r < 0)
1019 return r;
1020 } else {
1021 dup = acl_dup(acl);
1022 if (!dup)
1023 return -errno;
1024
1025 /* the mask was already added earlier if needed */
1026 }
1027
1028 r = add_base_acls_if_needed(&dup, path);
1029 if (r < 0)
1030 return r;
1031
1032 t = acl_to_any_text(dup, NULL, ',', TEXT_ABBREVIATE);
1033 log_debug("Setting %s ACL %s on %s.",
1034 type == ACL_TYPE_ACCESS ? "access" : "default",
1035 strna(t), pretty);
1036
1037 r = acl_set_file(path, type, dup);
1038 if (r < 0)
1039 /* Return positive to indicate we already warned */
1040 return -log_error_errno(errno,
1041 "Setting %s ACL \"%s\" on %s failed: %m",
1042 type == ACL_TYPE_ACCESS ? "access" : "default",
1043 strna(t), pretty);
1044
1045 return 0;
1046 }
1047 #endif
1048
1049 static int fd_set_acls(Item *item, int fd, const char *path, const struct stat *st) {
1050 int r = 0;
1051 #if HAVE_ACL
1052 char procfs_path[STRLEN("/proc/self/fd/") + DECIMAL_STR_MAX(int)];
1053 struct stat stbuf;
1054
1055 assert(item);
1056 assert(fd);
1057 assert(path);
1058
1059 if (!st) {
1060 if (fstat(fd, &stbuf) < 0)
1061 return log_error_errno(errno, "fstat(%s) failed: %m", path);
1062 st = &stbuf;
1063 }
1064
1065 if (hardlink_vulnerable(st))
1066 return log_error_errno(SYNTHETIC_ERRNO(EPERM),
1067 "Refusing to set ACLs on hardlinked file %s while the fs.protected_hardlinks sysctl is turned off.",
1068 path);
1069
1070 if (S_ISLNK(st->st_mode)) {
1071 log_debug("Skipping ACL fix for symlink %s.", path);
1072 return 0;
1073 }
1074
1075 xsprintf(procfs_path, "/proc/self/fd/%i", fd);
1076
1077 if (item->acl_access)
1078 r = path_set_acl(procfs_path, path, ACL_TYPE_ACCESS, item->acl_access, item->append_or_force);
1079
1080 /* set only default acls to folders */
1081 if (r == 0 && item->acl_default && S_ISDIR(st->st_mode))
1082 r = path_set_acl(procfs_path, path, ACL_TYPE_DEFAULT, item->acl_default, item->append_or_force);
1083
1084 if (r > 0)
1085 return -r; /* already warned */
1086 if (r == -EOPNOTSUPP) {
1087 log_debug_errno(r, "ACLs not supported by file system at %s", path);
1088 return 0;
1089 }
1090 if (r < 0)
1091 return log_error_errno(r, "ACL operation on \"%s\" failed: %m", path);
1092 #endif
1093 return r;
1094 }
1095
1096 static int path_set_acls(Item *item, const char *path) {
1097 int r = 0;
1098 #if HAVE_ACL
1099 _cleanup_close_ int fd = -1;
1100
1101 assert(item);
1102 assert(path);
1103
1104 fd = path_open_safe(path);
1105 if (fd < 0)
1106 return fd;
1107
1108 r = fd_set_acls(item, fd, path, NULL);
1109 #endif
1110 return r;
1111 }
1112
1113 static int parse_attribute_from_arg(Item *item) {
1114
1115 static const struct {
1116 char character;
1117 unsigned value;
1118 } attributes[] = {
1119 { 'A', FS_NOATIME_FL }, /* do not update atime */
1120 { 'S', FS_SYNC_FL }, /* Synchronous updates */
1121 { 'D', FS_DIRSYNC_FL }, /* dirsync behaviour (directories only) */
1122 { 'a', FS_APPEND_FL }, /* writes to file may only append */
1123 { 'c', FS_COMPR_FL }, /* Compress file */
1124 { 'd', FS_NODUMP_FL }, /* do not dump file */
1125 { 'e', FS_EXTENT_FL }, /* Extents */
1126 { 'i', FS_IMMUTABLE_FL }, /* Immutable file */
1127 { 'j', FS_JOURNAL_DATA_FL }, /* Reserved for ext3 */
1128 { 's', FS_SECRM_FL }, /* Secure deletion */
1129 { 'u', FS_UNRM_FL }, /* Undelete */
1130 { 't', FS_NOTAIL_FL }, /* file tail should not be merged */
1131 { 'T', FS_TOPDIR_FL }, /* Top of directory hierarchies */
1132 { 'C', FS_NOCOW_FL }, /* Do not cow file */
1133 { 'P', FS_PROJINHERIT_FL }, /* Inherit the quota project ID */
1134 };
1135
1136 enum {
1137 MODE_ADD,
1138 MODE_DEL,
1139 MODE_SET
1140 } mode = MODE_ADD;
1141
1142 unsigned value = 0, mask = 0;
1143 const char *p;
1144
1145 assert(item);
1146
1147 p = item->argument;
1148 if (p) {
1149 if (*p == '+') {
1150 mode = MODE_ADD;
1151 p++;
1152 } else if (*p == '-') {
1153 mode = MODE_DEL;
1154 p++;
1155 } else if (*p == '=') {
1156 mode = MODE_SET;
1157 p++;
1158 }
1159 }
1160
1161 if (isempty(p) && mode != MODE_SET)
1162 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
1163 "Setting file attribute on '%s' needs an attribute specification.",
1164 item->path);
1165
1166 for (; p && *p ; p++) {
1167 unsigned i, v;
1168
1169 for (i = 0; i < ELEMENTSOF(attributes); i++)
1170 if (*p == attributes[i].character)
1171 break;
1172
1173 if (i >= ELEMENTSOF(attributes))
1174 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
1175 "Unknown file attribute '%c' on '%s'.",
1176 *p, item->path);
1177
1178 v = attributes[i].value;
1179
1180 SET_FLAG(value, v, IN_SET(mode, MODE_ADD, MODE_SET));
1181
1182 mask |= v;
1183 }
1184
1185 if (mode == MODE_SET)
1186 mask |= CHATTR_ALL_FL;
1187
1188 assert(mask != 0);
1189
1190 item->attribute_mask = mask;
1191 item->attribute_value = value;
1192 item->attribute_set = true;
1193
1194 return 0;
1195 }
1196
1197 static int fd_set_attribute(Item *item, int fd, const char *path, const struct stat *st) {
1198 _cleanup_close_ int procfs_fd = -1;
1199 struct stat stbuf;
1200 unsigned f;
1201 int r;
1202
1203 assert(item);
1204 assert(fd);
1205 assert(path);
1206
1207 if (!item->attribute_set || item->attribute_mask == 0)
1208 return 0;
1209
1210 if (!st) {
1211 if (fstat(fd, &stbuf) < 0)
1212 return log_error_errno(errno, "fstat(%s) failed: %m", path);
1213 st = &stbuf;
1214 }
1215
1216 /* Issuing the file attribute ioctls on device nodes is not
1217 * safe, as that will be delivered to the drivers, not the
1218 * file system containing the device node. */
1219 if (!S_ISREG(st->st_mode) && !S_ISDIR(st->st_mode))
1220 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
1221 "Setting file flags is only supported on regular files and directories, cannot set on '%s'.",
1222 path);
1223
1224 f = item->attribute_value & item->attribute_mask;
1225
1226 /* Mask away directory-specific flags */
1227 if (!S_ISDIR(st->st_mode))
1228 f &= ~FS_DIRSYNC_FL;
1229
1230 procfs_fd = fd_reopen(fd, O_RDONLY|O_CLOEXEC|O_NOATIME);
1231 if (procfs_fd < 0)
1232 return log_error_errno(procfs_fd, "Failed to re-open '%s': %m", path);
1233
1234 r = chattr_fd(procfs_fd, f, item->attribute_mask, NULL);
1235 if (r < 0)
1236 log_full_errno(IN_SET(r, -ENOTTY, -EOPNOTSUPP) ? LOG_DEBUG : LOG_WARNING,
1237 r,
1238 "Cannot set file attribute for '%s', value=0x%08x, mask=0x%08x, ignoring: %m",
1239 path, item->attribute_value, item->attribute_mask);
1240
1241 return 0;
1242 }
1243
1244 static int path_set_attribute(Item *item, const char *path) {
1245 _cleanup_close_ int fd = -1;
1246
1247 if (!item->attribute_set || item->attribute_mask == 0)
1248 return 0;
1249
1250 fd = path_open_safe(path);
1251 if (fd < 0)
1252 return fd;
1253
1254 return fd_set_attribute(item, fd, path, NULL);
1255 }
1256
1257 static int write_one_file(Item *i, const char *path) {
1258 _cleanup_close_ int fd = -1, dir_fd = -1;
1259 char *bn;
1260 int flags, r;
1261
1262 assert(i);
1263 assert(path);
1264 assert(i->argument);
1265 assert(i->type == WRITE_FILE);
1266
1267 /* Validate the path and keep the fd on the directory for opening the
1268 * file so we're sure that it can't be changed behind our back. */
1269 dir_fd = path_open_parent_safe(path);
1270 if (dir_fd < 0)
1271 return dir_fd;
1272
1273 bn = basename(path);
1274
1275 flags = O_NONBLOCK|O_CLOEXEC|O_WRONLY|O_NOCTTY;
1276
1277 /* Follows symlinks */
1278 fd = openat(dir_fd, bn, i->append_or_force ? flags|O_APPEND : flags, i->mode);
1279 if (fd < 0) {
1280 if (errno == ENOENT) {
1281 log_debug_errno(errno, "Not writing missing file \"%s\": %m", path);
1282 return 0;
1283 }
1284 return log_error_errno(errno, "Failed to open file \"%s\": %m", path);
1285 }
1286
1287 /* 'w' is allowed to write into any kind of files. */
1288 log_debug("Writing to \"%s\".", path);
1289
1290 r = loop_write(fd, i->argument, strlen(i->argument), false);
1291 if (r < 0)
1292 return log_error_errno(r, "Failed to write file \"%s\": %m", path);
1293
1294 return fd_set_perms(i, fd, path, NULL);
1295 }
1296
1297 static int create_file(Item *i, const char *path) {
1298 _cleanup_close_ int fd = -1, dir_fd = -1;
1299 struct stat stbuf, *st = NULL;
1300 int r = 0;
1301 char *bn;
1302
1303 assert(i);
1304 assert(path);
1305 assert(i->type == CREATE_FILE);
1306
1307 /* 'f' operates on regular files exclusively. */
1308
1309 /* Validate the path and keep the fd on the directory for opening the
1310 * file so we're sure that it can't be changed behind our back. */
1311 dir_fd = path_open_parent_safe(path);
1312 if (dir_fd < 0)
1313 return dir_fd;
1314
1315 bn = basename(path);
1316
1317 RUN_WITH_UMASK(0000) {
1318 mac_selinux_create_file_prepare(path, S_IFREG);
1319 fd = openat(dir_fd, bn, O_CREAT|O_EXCL|O_NOFOLLOW|O_NONBLOCK|O_CLOEXEC|O_WRONLY|O_NOCTTY, i->mode);
1320 mac_selinux_create_file_clear();
1321 }
1322
1323 if (fd < 0) {
1324 /* Even on a read-only filesystem, open(2) returns EEXIST if the
1325 * file already exists. It returns EROFS only if it needs to
1326 * create the file. */
1327 if (errno != EEXIST)
1328 return log_error_errno(errno, "Failed to create file %s: %m", path);
1329
1330 /* Re-open the file. At that point it must exist since open(2)
1331 * failed with EEXIST. We still need to check if the perms/mode
1332 * need to be changed. For read-only filesystems, we let
1333 * fd_set_perms() report the error if the perms need to be
1334 * modified. */
1335 fd = openat(dir_fd, bn, O_NOFOLLOW|O_CLOEXEC|O_PATH, i->mode);
1336 if (fd < 0)
1337 return log_error_errno(errno, "Failed to re-open file %s: %m", path);
1338
1339 if (fstat(fd, &stbuf) < 0)
1340 return log_error_errno(errno, "stat(%s) failed: %m", path);
1341
1342 if (!S_ISREG(stbuf.st_mode)) {
1343 log_error("%s exists and is not a regular file.", path);
1344 return -EEXIST;
1345 }
1346
1347 st = &stbuf;
1348 } else {
1349
1350 log_debug("\"%s\" has been created.", path);
1351
1352 if (i->argument) {
1353 log_debug("Writing to \"%s\".", path);
1354
1355 r = loop_write(fd, i->argument, strlen(i->argument), false);
1356 if (r < 0)
1357 return log_error_errno(r, "Failed to write file \"%s\": %m", path);
1358 }
1359 }
1360
1361 return fd_set_perms(i, fd, path, st);
1362 }
1363
1364 static int truncate_file(Item *i, const char *path) {
1365 _cleanup_close_ int fd = -1, dir_fd = -1;
1366 struct stat stbuf, *st = NULL;
1367 bool erofs = false;
1368 int r = 0;
1369 char *bn;
1370
1371 assert(i);
1372 assert(path);
1373 assert(i->type == TRUNCATE_FILE);
1374
1375 /* We want to operate on regular file exclusively especially since
1376 * O_TRUNC is unspecified if the file is neither a regular file nor a
1377 * fifo nor a terminal device. Therefore we first open the file and make
1378 * sure it's a regular one before truncating it. */
1379
1380 /* Validate the path and keep the fd on the directory for opening the
1381 * file so we're sure that it can't be changed behind our back. */
1382 dir_fd = path_open_parent_safe(path);
1383 if (dir_fd < 0)
1384 return dir_fd;
1385
1386 bn = basename(path);
1387
1388 RUN_WITH_UMASK(0000) {
1389 mac_selinux_create_file_prepare(path, S_IFREG);
1390 fd = openat(dir_fd, bn, O_CREAT|O_NOFOLLOW|O_NONBLOCK|O_CLOEXEC|O_WRONLY|O_NOCTTY, i->mode);
1391 mac_selinux_create_file_clear();
1392 }
1393
1394 if (fd < 0) {
1395 if (errno != EROFS)
1396 return log_error_errno(errno, "Failed to open/create file %s: %m", path);
1397
1398 /* On a read-only filesystem, we don't want to fail if the
1399 * target is already empty and the perms are set. So we still
1400 * proceed with the sanity checks and let the remaining
1401 * operations fail with EROFS if they try to modify the target
1402 * file. */
1403
1404 fd = openat(dir_fd, bn, O_NOFOLLOW|O_CLOEXEC|O_PATH, i->mode);
1405 if (fd < 0) {
1406 if (errno == ENOENT) {
1407 log_error("Cannot create file %s on a read-only file system.", path);
1408 return -EROFS;
1409 }
1410
1411 return log_error_errno(errno, "Failed to re-open file %s: %m", path);
1412 }
1413
1414 erofs = true;
1415 }
1416
1417 if (fstat(fd, &stbuf) < 0)
1418 return log_error_errno(errno, "stat(%s) failed: %m", path);
1419
1420 if (!S_ISREG(stbuf.st_mode)) {
1421 log_error("%s exists and is not a regular file.", path);
1422 return -EEXIST;
1423 }
1424
1425 if (stbuf.st_size > 0) {
1426 if (ftruncate(fd, 0) < 0) {
1427 r = erofs ? -EROFS : -errno;
1428 return log_error_errno(r, "Failed to truncate file %s: %m", path);
1429 }
1430 } else
1431 st = &stbuf;
1432
1433 log_debug("\"%s\" has been created.", path);
1434
1435 if (i->argument) {
1436 log_debug("Writing to \"%s\".", path);
1437
1438 r = loop_write(fd, i->argument, strlen(i->argument), false);
1439 if (r < 0) {
1440 r = erofs ? -EROFS : r;
1441 return log_error_errno(r, "Failed to write file %s: %m", path);
1442 }
1443 }
1444
1445 return fd_set_perms(i, fd, path, st);
1446 }
1447
1448 static int copy_files(Item *i) {
1449 _cleanup_close_ int dfd = -1, fd = -1;
1450 char *bn;
1451 int r;
1452
1453 log_debug("Copying tree \"%s\" to \"%s\".", i->argument, i->path);
1454
1455 bn = basename(i->path);
1456
1457 /* Validate the path and use the returned directory fd for copying the
1458 * target so we're sure that the path can't be changed behind our
1459 * back. */
1460 dfd = path_open_parent_safe(i->path);
1461 if (dfd < 0)
1462 return dfd;
1463
1464 r = copy_tree_at(AT_FDCWD, i->argument,
1465 dfd, bn,
1466 i->uid_set ? i->uid : UID_INVALID,
1467 i->gid_set ? i->gid : GID_INVALID,
1468 COPY_REFLINK | COPY_MERGE_EMPTY);
1469 if (r < 0) {
1470 struct stat a, b;
1471
1472 /* If the target already exists on read-only filesystems, trying
1473 * to create the target will not fail with EEXIST but with
1474 * EROFS. */
1475 if (r == -EROFS && faccessat(dfd, bn, F_OK, AT_SYMLINK_NOFOLLOW) == 0)
1476 r = -EEXIST;
1477
1478 if (r != -EEXIST)
1479 return log_error_errno(r, "Failed to copy files to %s: %m", i->path);
1480
1481 if (stat(i->argument, &a) < 0)
1482 return log_error_errno(errno, "stat(%s) failed: %m", i->argument);
1483
1484 if (fstatat(dfd, bn, &b, AT_SYMLINK_NOFOLLOW) < 0)
1485 return log_error_errno(errno, "stat(%s) failed: %m", i->path);
1486
1487 if ((a.st_mode ^ b.st_mode) & S_IFMT) {
1488 log_debug("Can't copy to %s, file exists already and is of different type", i->path);
1489 return 0;
1490 }
1491 }
1492
1493 fd = openat(dfd, bn, O_NOFOLLOW|O_CLOEXEC|O_PATH);
1494 if (fd < 0)
1495 return log_error_errno(errno, "Failed to openat(%s): %m", i->path);
1496
1497 return fd_set_perms(i, fd, i->path, NULL);
1498 }
1499
1500 typedef enum {
1501 CREATION_NORMAL,
1502 CREATION_EXISTING,
1503 CREATION_FORCE,
1504 _CREATION_MODE_MAX,
1505 _CREATION_MODE_INVALID = -1
1506 } CreationMode;
1507
1508 static const char *const creation_mode_verb_table[_CREATION_MODE_MAX] = {
1509 [CREATION_NORMAL] = "Created",
1510 [CREATION_EXISTING] = "Found existing",
1511 [CREATION_FORCE] = "Created replacement",
1512 };
1513
1514 DEFINE_PRIVATE_STRING_TABLE_LOOKUP_TO_STRING(creation_mode_verb, CreationMode);
1515
1516 static int create_directory_or_subvolume(const char *path, mode_t mode, bool subvol, CreationMode *creation) {
1517 _cleanup_close_ int pfd = -1;
1518 CreationMode c;
1519 int r;
1520
1521 assert(path);
1522
1523 if (!creation)
1524 creation = &c;
1525
1526 pfd = path_open_parent_safe(path);
1527 if (pfd < 0)
1528 return pfd;
1529
1530 if (subvol) {
1531 if (btrfs_is_subvol(empty_to_root(arg_root)) <= 0)
1532
1533 /* Don't create a subvolume unless the root directory is
1534 * one, too. We do this under the assumption that if the
1535 * root directory is just a plain directory (i.e. very
1536 * light-weight), we shouldn't try to split it up into
1537 * subvolumes (i.e. more heavy-weight). Thus, chroot()
1538 * environments and suchlike will get a full brtfs
1539 * subvolume set up below their tree only if they
1540 * specifically set up a btrfs subvolume for the root
1541 * dir too. */
1542
1543 subvol = false;
1544 else {
1545 RUN_WITH_UMASK((~mode) & 0777)
1546 r = btrfs_subvol_make_fd(pfd, basename(path));
1547 }
1548 } else
1549 r = 0;
1550
1551 if (!subvol || r == -ENOTTY)
1552 RUN_WITH_UMASK(0000)
1553 r = mkdirat_label(pfd, basename(path), mode);
1554
1555 if (r < 0) {
1556 int k;
1557
1558 if (!IN_SET(r, -EEXIST, -EROFS))
1559 return log_error_errno(r, "Failed to create directory or subvolume \"%s\": %m", path);
1560
1561 k = is_dir_fd(pfd);
1562 if (k == -ENOENT && r == -EROFS)
1563 return log_error_errno(r, "%s does not exist and cannot be created as the file system is read-only.", path);
1564 if (k < 0)
1565 return log_error_errno(k, "Failed to check if %s exists: %m", path);
1566 if (!k) {
1567 log_warning("\"%s\" already exists and is not a directory.", path);
1568 return -EEXIST;
1569 }
1570
1571 *creation = CREATION_EXISTING;
1572 } else
1573 *creation = CREATION_NORMAL;
1574
1575 log_debug("%s directory \"%s\".", creation_mode_verb_to_string(*creation), path);
1576
1577 r = openat(pfd, basename(path), O_NOCTTY|O_CLOEXEC|O_DIRECTORY);
1578 if (r < 0)
1579 return log_error_errno(errno, "Failed to open directory '%s': %m", basename(path));
1580
1581 return r;
1582 }
1583
1584 static int create_directory(Item *i, const char *path) {
1585 _cleanup_close_ int fd = -1;
1586
1587 assert(i);
1588 assert(IN_SET(i->type, CREATE_DIRECTORY, TRUNCATE_DIRECTORY));
1589
1590 fd = create_directory_or_subvolume(path, i->mode, false, NULL);
1591 if (fd == -EEXIST)
1592 return 0;
1593 if (fd < 0)
1594 return fd;
1595
1596 return fd_set_perms(i, fd, path, NULL);
1597 }
1598
1599 static int create_subvolume(Item *i, const char *path) {
1600 _cleanup_close_ int fd = -1;
1601 CreationMode creation;
1602 int r, q = 0;
1603
1604 assert(i);
1605 assert(IN_SET(i->type, CREATE_SUBVOLUME, CREATE_SUBVOLUME_NEW_QUOTA, CREATE_SUBVOLUME_INHERIT_QUOTA));
1606
1607 fd = create_directory_or_subvolume(path, i->mode, true, &creation);
1608 if (fd == -EEXIST)
1609 return 0;
1610 if (fd < 0)
1611 return fd;
1612
1613 if (creation == CREATION_NORMAL &&
1614 IN_SET(i->type, CREATE_SUBVOLUME_NEW_QUOTA, CREATE_SUBVOLUME_INHERIT_QUOTA)) {
1615 r = btrfs_subvol_auto_qgroup_fd(fd, 0, i->type == CREATE_SUBVOLUME_NEW_QUOTA);
1616 if (r == -ENOTTY)
1617 log_debug_errno(r, "Couldn't adjust quota for subvolume \"%s\" (unsupported fs or dir not a subvolume): %m", i->path);
1618 else if (r == -EROFS)
1619 log_debug_errno(r, "Couldn't adjust quota for subvolume \"%s\" (fs is read-only).", i->path);
1620 else if (r == -ENOPROTOOPT)
1621 log_debug_errno(r, "Couldn't adjust quota for subvolume \"%s\" (quota support is disabled).", i->path);
1622 else if (r < 0)
1623 q = log_error_errno(r, "Failed to adjust quota for subvolume \"%s\": %m", i->path);
1624 else if (r > 0)
1625 log_debug("Adjusted quota for subvolume \"%s\".", i->path);
1626 else if (r == 0)
1627 log_debug("Quota for subvolume \"%s\" already in place, no change made.", i->path);
1628 }
1629
1630 r = fd_set_perms(i, fd, path, NULL);
1631 if (q < 0) /* prefer the quota change error from above */
1632 return q;
1633
1634 return r;
1635 }
1636
1637 static int empty_directory(Item *i, const char *path) {
1638 int r;
1639
1640 assert(i);
1641 assert(i->type == EMPTY_DIRECTORY);
1642
1643 r = is_dir(path, false);
1644 if (r == -ENOENT) {
1645 /* Option "e" operates only on existing objects. Do not
1646 * print errors about non-existent files or directories */
1647 log_debug("Skipping missing directory: %s", path);
1648 return 0;
1649 }
1650 if (r < 0)
1651 return log_error_errno(r, "is_dir() failed on path %s: %m", path);
1652 if (r == 0)
1653 return log_error_errno(SYNTHETIC_ERRNO(EEXIST),
1654 "'%s' already exists and is not a directory.",
1655 path);
1656
1657 return path_set_perms(i, path);
1658 }
1659
1660 static int create_device(Item *i, mode_t file_type) {
1661 _cleanup_close_ int dfd = -1, fd = -1;
1662 CreationMode creation;
1663 char *bn;
1664 int r;
1665
1666 assert(i);
1667 assert(IN_SET(file_type, S_IFBLK, S_IFCHR));
1668
1669 bn = basename(i->path);
1670
1671 /* Validate the path and use the returned directory fd for copying the
1672 * target so we're sure that the path can't be changed behind our
1673 * back. */
1674 dfd = path_open_parent_safe(i->path);
1675 if (dfd < 0)
1676 return dfd;
1677
1678 RUN_WITH_UMASK(0000) {
1679 mac_selinux_create_file_prepare(i->path, file_type);
1680 r = mknodat(dfd, bn, i->mode | file_type, i->major_minor);
1681 mac_selinux_create_file_clear();
1682 }
1683
1684 if (r < 0) {
1685 struct stat st;
1686
1687 if (errno == EPERM) {
1688 log_debug("We lack permissions, possibly because of cgroup configuration; "
1689 "skipping creation of device node %s.", i->path);
1690 return 0;
1691 }
1692
1693 if (errno != EEXIST)
1694 return log_error_errno(errno, "Failed to create device node %s: %m", i->path);
1695
1696 if (fstatat(dfd, bn, &st, 0) < 0)
1697 return log_error_errno(errno, "stat(%s) failed: %m", i->path);
1698
1699 if ((st.st_mode & S_IFMT) != file_type) {
1700
1701 if (i->append_or_force) {
1702
1703 RUN_WITH_UMASK(0000) {
1704 mac_selinux_create_file_prepare(i->path, file_type);
1705 /* FIXME: need to introduce mknodat_atomic() */
1706 r = mknod_atomic(i->path, i->mode | file_type, i->major_minor);
1707 mac_selinux_create_file_clear();
1708 }
1709
1710 if (r < 0)
1711 return log_error_errno(r, "Failed to create device node \"%s\": %m", i->path);
1712 creation = CREATION_FORCE;
1713 } else {
1714 log_debug("%s is not a device node.", i->path);
1715 return 0;
1716 }
1717 } else
1718 creation = CREATION_EXISTING;
1719 } else
1720 creation = CREATION_NORMAL;
1721
1722 log_debug("%s %s device node \"%s\" %u:%u.",
1723 creation_mode_verb_to_string(creation),
1724 i->type == CREATE_BLOCK_DEVICE ? "block" : "char",
1725 i->path, major(i->mode), minor(i->mode));
1726
1727 fd = openat(dfd, bn, O_NOFOLLOW|O_CLOEXEC|O_PATH);
1728 if (fd < 0)
1729 return log_error_errno(errno, "Failed to openat(%s): %m", i->path);
1730
1731 return fd_set_perms(i, fd, i->path, NULL);
1732 }
1733
1734 static int create_fifo(Item *i, const char *path) {
1735 _cleanup_close_ int pfd = -1, fd = -1;
1736 CreationMode creation;
1737 struct stat st;
1738 char *bn;
1739 int r;
1740
1741 pfd = path_open_parent_safe(path);
1742 if (pfd < 0)
1743 return pfd;
1744
1745 bn = basename(path);
1746
1747 RUN_WITH_UMASK(0000) {
1748 mac_selinux_create_file_prepare(path, S_IFIFO);
1749 r = mkfifoat(pfd, bn, i->mode);
1750 mac_selinux_create_file_clear();
1751 }
1752
1753 if (r < 0) {
1754 if (errno != EEXIST)
1755 return log_error_errno(errno, "Failed to create fifo %s: %m", path);
1756
1757 if (fstatat(pfd, bn, &st, AT_SYMLINK_NOFOLLOW) < 0)
1758 return log_error_errno(errno, "stat(%s) failed: %m", path);
1759
1760 if (!S_ISFIFO(st.st_mode)) {
1761
1762 if (i->append_or_force) {
1763 RUN_WITH_UMASK(0000) {
1764 mac_selinux_create_file_prepare(path, S_IFIFO);
1765 r = mkfifoat_atomic(pfd, bn, i->mode);
1766 mac_selinux_create_file_clear();
1767 }
1768
1769 if (r < 0)
1770 return log_error_errno(r, "Failed to create fifo %s: %m", path);
1771 creation = CREATION_FORCE;
1772 } else {
1773 log_warning("\"%s\" already exists and is not a fifo.", path);
1774 return 0;
1775 }
1776 } else
1777 creation = CREATION_EXISTING;
1778 } else
1779 creation = CREATION_NORMAL;
1780
1781 log_debug("%s fifo \"%s\".", creation_mode_verb_to_string(creation), path);
1782
1783 fd = openat(pfd, bn, O_NOFOLLOW|O_CLOEXEC|O_PATH);
1784 if (fd < 0)
1785 return log_error_errno(errno, "Failed to openat(%s): %m", path);
1786
1787 return fd_set_perms(i, fd, i->path, NULL);
1788 }
1789
1790 typedef int (*action_t)(Item *i, const char *path);
1791 typedef int (*fdaction_t)(Item *i, int fd, const char *path, const struct stat *st);
1792
1793 static int item_do(Item *i, int fd, const char *path, fdaction_t action) {
1794 struct stat st;
1795 int r = 0, q;
1796
1797 assert(i);
1798 assert(path);
1799 assert(fd >= 0);
1800
1801 if (fstat(fd, &st) < 0) {
1802 r = log_error_errno(errno, "fstat() on file failed: %m");
1803 goto finish;
1804 }
1805
1806 /* This returns the first error we run into, but nevertheless
1807 * tries to go on */
1808 r = action(i, fd, path, &st);
1809
1810 if (S_ISDIR(st.st_mode)) {
1811 char procfs_path[STRLEN("/proc/self/fd/") + DECIMAL_STR_MAX(int)];
1812 _cleanup_closedir_ DIR *d = NULL;
1813 struct dirent *de;
1814
1815 /* The passed 'fd' was opened with O_PATH. We need to convert
1816 * it into a 'regular' fd before reading the directory content. */
1817 xsprintf(procfs_path, "/proc/self/fd/%i", fd);
1818
1819 d = opendir(procfs_path);
1820 if (!d) {
1821 log_error_errno(errno, "Failed to opendir() '%s': %m", procfs_path);
1822 if (r == 0)
1823 r = -errno;
1824 goto finish;
1825 }
1826
1827 FOREACH_DIRENT_ALL(de, d, q = -errno; goto finish) {
1828 int de_fd;
1829
1830 if (dot_or_dot_dot(de->d_name))
1831 continue;
1832
1833 de_fd = openat(fd, de->d_name, O_NOFOLLOW|O_CLOEXEC|O_PATH);
1834 if (de_fd < 0)
1835 q = log_error_errno(errno, "Failed to open() file '%s': %m", de->d_name);
1836 else {
1837 _cleanup_free_ char *de_path = NULL;
1838
1839 de_path = path_join(path, de->d_name);
1840 if (!de_path)
1841 q = log_oom();
1842 else
1843 /* Pass ownership of dirent fd over */
1844 q = item_do(i, de_fd, de_path, action);
1845 }
1846
1847 if (q < 0 && r == 0)
1848 r = q;
1849 }
1850 }
1851 finish:
1852 safe_close(fd);
1853 return r;
1854 }
1855
1856 static int glob_item(Item *i, action_t action) {
1857 _cleanup_globfree_ glob_t g = {
1858 .gl_opendir = (void *(*)(const char *)) opendir_nomod,
1859 };
1860 int r = 0, k;
1861 char **fn;
1862
1863 k = safe_glob(i->path, GLOB_NOSORT|GLOB_BRACE, &g);
1864 if (k < 0 && k != -ENOENT)
1865 return log_error_errno(k, "glob(%s) failed: %m", i->path);
1866
1867 STRV_FOREACH(fn, g.gl_pathv) {
1868 k = action(i, *fn);
1869 if (k < 0 && r == 0)
1870 r = k;
1871 }
1872
1873 return r;
1874 }
1875
1876 static int glob_item_recursively(Item *i, fdaction_t action) {
1877 _cleanup_globfree_ glob_t g = {
1878 .gl_opendir = (void *(*)(const char *)) opendir_nomod,
1879 };
1880 int r = 0, k;
1881 char **fn;
1882
1883 k = safe_glob(i->path, GLOB_NOSORT|GLOB_BRACE, &g);
1884 if (k < 0 && k != -ENOENT)
1885 return log_error_errno(k, "glob(%s) failed: %m", i->path);
1886
1887 STRV_FOREACH(fn, g.gl_pathv) {
1888 _cleanup_close_ int fd = -1;
1889
1890 /* Make sure we won't trigger/follow file object (such as
1891 * device nodes, automounts, ...) pointed out by 'fn' with
1892 * O_PATH. Note, when O_PATH is used, flags other than
1893 * O_CLOEXEC, O_DIRECTORY, and O_NOFOLLOW are ignored. */
1894
1895 fd = open(*fn, O_CLOEXEC|O_NOFOLLOW|O_PATH);
1896 if (fd < 0) {
1897 log_error_errno(errno, "Opening '%s' failed: %m", *fn);
1898 if (r == 0)
1899 r = -errno;
1900 continue;
1901 }
1902
1903 k = item_do(i, fd, *fn, action);
1904 if (k < 0 && r == 0)
1905 r = k;
1906
1907 /* we passed fd ownership to the previous call */
1908 fd = -1;
1909 }
1910
1911 return r;
1912 }
1913
1914 static int create_item(Item *i) {
1915 CreationMode creation;
1916 int r = 0;
1917
1918 assert(i);
1919
1920 log_debug("Running create action for entry %c %s", (char) i->type, i->path);
1921
1922 switch (i->type) {
1923
1924 case IGNORE_PATH:
1925 case IGNORE_DIRECTORY_PATH:
1926 case REMOVE_PATH:
1927 case RECURSIVE_REMOVE_PATH:
1928 return 0;
1929
1930 case CREATE_FILE:
1931 RUN_WITH_UMASK(0000)
1932 (void) mkdir_parents_label(i->path, 0755);
1933
1934 r = create_file(i, i->path);
1935 if (r < 0)
1936 return r;
1937 break;
1938
1939 case TRUNCATE_FILE:
1940 RUN_WITH_UMASK(0000)
1941 (void) mkdir_parents_label(i->path, 0755);
1942
1943 r = truncate_file(i, i->path);
1944 if (r < 0)
1945 return r;
1946 break;
1947
1948 case COPY_FILES:
1949 RUN_WITH_UMASK(0000)
1950 (void) mkdir_parents_label(i->path, 0755);
1951
1952 r = copy_files(i);
1953 if (r < 0)
1954 return r;
1955 break;
1956
1957 case WRITE_FILE:
1958 r = glob_item(i, write_one_file);
1959 if (r < 0)
1960 return r;
1961
1962 break;
1963
1964 case CREATE_DIRECTORY:
1965 case TRUNCATE_DIRECTORY:
1966 RUN_WITH_UMASK(0000)
1967 (void) mkdir_parents_label(i->path, 0755);
1968
1969 r = create_directory(i, i->path);
1970 if (r < 0)
1971 return r;
1972 break;
1973
1974 case CREATE_SUBVOLUME:
1975 case CREATE_SUBVOLUME_INHERIT_QUOTA:
1976 case CREATE_SUBVOLUME_NEW_QUOTA:
1977 RUN_WITH_UMASK(0000)
1978 (void) mkdir_parents_label(i->path, 0755);
1979
1980 r = create_subvolume(i, i->path);
1981 if (r < 0)
1982 return r;
1983 break;
1984
1985 case EMPTY_DIRECTORY:
1986 r = glob_item(i, empty_directory);
1987 if (r < 0)
1988 return r;
1989 break;
1990
1991 case CREATE_FIFO:
1992 RUN_WITH_UMASK(0000)
1993 (void) mkdir_parents_label(i->path, 0755);
1994
1995 r = create_fifo(i, i->path);
1996 if (r < 0)
1997 return r;
1998 break;
1999
2000 case CREATE_SYMLINK: {
2001 RUN_WITH_UMASK(0000)
2002 (void) mkdir_parents_label(i->path, 0755);
2003
2004 mac_selinux_create_file_prepare(i->path, S_IFLNK);
2005 r = symlink(i->argument, i->path);
2006 mac_selinux_create_file_clear();
2007
2008 if (r < 0) {
2009 _cleanup_free_ char *x = NULL;
2010
2011 if (errno != EEXIST)
2012 return log_error_errno(errno, "symlink(%s, %s) failed: %m", i->argument, i->path);
2013
2014 r = readlink_malloc(i->path, &x);
2015 if (r < 0 || !streq(i->argument, x)) {
2016
2017 if (i->append_or_force) {
2018 mac_selinux_create_file_prepare(i->path, S_IFLNK);
2019 r = symlink_atomic(i->argument, i->path);
2020 mac_selinux_create_file_clear();
2021
2022 if (IN_SET(r, -EISDIR, -EEXIST, -ENOTEMPTY)) {
2023 r = rm_rf(i->path, REMOVE_ROOT|REMOVE_PHYSICAL);
2024 if (r < 0)
2025 return log_error_errno(r, "rm -fr %s failed: %m", i->path);
2026
2027 mac_selinux_create_file_prepare(i->path, S_IFLNK);
2028 r = symlink(i->argument, i->path) < 0 ? -errno : 0;
2029 mac_selinux_create_file_clear();
2030 }
2031 if (r < 0)
2032 return log_error_errno(r, "symlink(%s, %s) failed: %m", i->argument, i->path);
2033
2034 creation = CREATION_FORCE;
2035 } else {
2036 log_debug("\"%s\" is not a symlink or does not point to the correct path.", i->path);
2037 return 0;
2038 }
2039 } else
2040 creation = CREATION_EXISTING;
2041 } else
2042
2043 creation = CREATION_NORMAL;
2044 log_debug("%s symlink \"%s\".", creation_mode_verb_to_string(creation), i->path);
2045 break;
2046 }
2047
2048 case CREATE_BLOCK_DEVICE:
2049 case CREATE_CHAR_DEVICE:
2050 if (have_effective_cap(CAP_MKNOD) == 0) {
2051 /* In a container we lack CAP_MKNOD. We shouldn't attempt to create the device node in that
2052 * case to avoid noise, and we don't support virtualized devices in containers anyway. */
2053
2054 log_debug("We lack CAP_MKNOD, skipping creation of device node %s.", i->path);
2055 return 0;
2056 }
2057
2058 RUN_WITH_UMASK(0000)
2059 (void) mkdir_parents_label(i->path, 0755);
2060
2061 r = create_device(i, i->type == CREATE_BLOCK_DEVICE ? S_IFBLK : S_IFCHR);
2062 if (r < 0)
2063 return r;
2064
2065 break;
2066
2067 case ADJUST_MODE:
2068 case RELABEL_PATH:
2069 r = glob_item(i, path_set_perms);
2070 if (r < 0)
2071 return r;
2072 break;
2073
2074 case RECURSIVE_RELABEL_PATH:
2075 r = glob_item_recursively(i, fd_set_perms);
2076 if (r < 0)
2077 return r;
2078 break;
2079
2080 case SET_XATTR:
2081 r = glob_item(i, path_set_xattrs);
2082 if (r < 0)
2083 return r;
2084 break;
2085
2086 case RECURSIVE_SET_XATTR:
2087 r = glob_item_recursively(i, fd_set_xattrs);
2088 if (r < 0)
2089 return r;
2090 break;
2091
2092 case SET_ACL:
2093 r = glob_item(i, path_set_acls);
2094 if (r < 0)
2095 return r;
2096 break;
2097
2098 case RECURSIVE_SET_ACL:
2099 r = glob_item_recursively(i, fd_set_acls);
2100 if (r < 0)
2101 return r;
2102 break;
2103
2104 case SET_ATTRIBUTE:
2105 r = glob_item(i, path_set_attribute);
2106 if (r < 0)
2107 return r;
2108 break;
2109
2110 case RECURSIVE_SET_ATTRIBUTE:
2111 r = glob_item_recursively(i, fd_set_attribute);
2112 if (r < 0)
2113 return r;
2114 break;
2115 }
2116
2117 return 0;
2118 }
2119
2120 static int remove_item_instance(Item *i, const char *instance) {
2121 int r;
2122
2123 assert(i);
2124
2125 switch (i->type) {
2126
2127 case REMOVE_PATH:
2128 if (remove(instance) < 0 && errno != ENOENT)
2129 return log_error_errno(errno, "rm(%s): %m", instance);
2130
2131 break;
2132
2133 case RECURSIVE_REMOVE_PATH:
2134 /* FIXME: we probably should use dir_cleanup() here instead of rm_rf() so that 'x' is honoured. */
2135 log_debug("rm -rf \"%s\"", instance);
2136 r = rm_rf(instance, REMOVE_ROOT|REMOVE_SUBVOLUME|REMOVE_PHYSICAL);
2137 if (r < 0 && r != -ENOENT)
2138 return log_error_errno(r, "rm_rf(%s): %m", instance);
2139
2140 break;
2141
2142 default:
2143 assert_not_reached("wut?");
2144 }
2145
2146 return 0;
2147 }
2148
2149 static int remove_item(Item *i) {
2150 int r;
2151
2152 assert(i);
2153
2154 log_debug("Running remove action for entry %c %s", (char) i->type, i->path);
2155
2156 switch (i->type) {
2157
2158 case TRUNCATE_DIRECTORY:
2159 /* FIXME: we probably should use dir_cleanup() here instead of rm_rf() so that 'x' is honoured. */
2160 log_debug("rm -rf \"%s\"", i->path);
2161 r = rm_rf(i->path, REMOVE_PHYSICAL);
2162 if (r < 0 && r != -ENOENT)
2163 return log_error_errno(r, "rm_rf(%s): %m", i->path);
2164
2165 return 0;
2166
2167 case REMOVE_PATH:
2168 case RECURSIVE_REMOVE_PATH:
2169 return glob_item(i, remove_item_instance);
2170
2171 default:
2172 return 0;
2173 }
2174 }
2175
2176 static int clean_item_instance(Item *i, const char* instance) {
2177 _cleanup_closedir_ DIR *d = NULL;
2178 struct stat s, ps;
2179 bool mountpoint;
2180 usec_t cutoff, n;
2181 char timestamp[FORMAT_TIMESTAMP_MAX];
2182
2183 assert(i);
2184
2185 if (!i->age_set)
2186 return 0;
2187
2188 n = now(CLOCK_REALTIME);
2189 if (n < i->age)
2190 return 0;
2191
2192 cutoff = n - i->age;
2193
2194 d = opendir_nomod(instance);
2195 if (!d) {
2196 if (IN_SET(errno, ENOENT, ENOTDIR)) {
2197 log_debug_errno(errno, "Directory \"%s\": %m", instance);
2198 return 0;
2199 }
2200
2201 return log_error_errno(errno, "Failed to open directory %s: %m", instance);
2202 }
2203
2204 if (fstat(dirfd(d), &s) < 0)
2205 return log_error_errno(errno, "stat(%s) failed: %m", i->path);
2206
2207 if (!S_ISDIR(s.st_mode))
2208 return log_error_errno(SYNTHETIC_ERRNO(ENOTDIR),
2209 "%s is not a directory.", i->path);
2210
2211 if (fstatat(dirfd(d), "..", &ps, AT_SYMLINK_NOFOLLOW) != 0)
2212 return log_error_errno(errno, "stat(%s/..) failed: %m", i->path);
2213
2214 mountpoint = s.st_dev != ps.st_dev || s.st_ino == ps.st_ino;
2215
2216 log_debug("Cleanup threshold for %s \"%s\" is %s",
2217 mountpoint ? "mount point" : "directory",
2218 instance,
2219 format_timestamp_us(timestamp, sizeof(timestamp), cutoff));
2220
2221 return dir_cleanup(i, instance, d, &s, cutoff, s.st_dev, mountpoint,
2222 MAX_DEPTH, i->keep_first_level);
2223 }
2224
2225 static int clean_item(Item *i) {
2226 assert(i);
2227
2228 log_debug("Running clean action for entry %c %s", (char) i->type, i->path);
2229
2230 switch (i->type) {
2231 case CREATE_DIRECTORY:
2232 case CREATE_SUBVOLUME:
2233 case CREATE_SUBVOLUME_INHERIT_QUOTA:
2234 case CREATE_SUBVOLUME_NEW_QUOTA:
2235 case TRUNCATE_DIRECTORY:
2236 case IGNORE_PATH:
2237 case COPY_FILES:
2238 clean_item_instance(i, i->path);
2239 return 0;
2240 case EMPTY_DIRECTORY:
2241 case IGNORE_DIRECTORY_PATH:
2242 return glob_item(i, clean_item_instance);
2243 default:
2244 return 0;
2245 }
2246 }
2247
2248 static int process_item(Item *i, OperationMask operation) {
2249 OperationMask todo;
2250 int r, q, p;
2251
2252 assert(i);
2253
2254 todo = operation & ~i->done;
2255 if (todo == 0) /* Everything already done? */
2256 return 0;
2257
2258 i->done |= operation;
2259
2260 r = chase_symlinks(i->path, arg_root, CHASE_NO_AUTOFS|CHASE_WARN, NULL, NULL);
2261 if (r == -EREMOTE) {
2262 log_notice_errno(r, "Skipping %s", i->path);
2263 return 0;
2264 }
2265 if (r < 0)
2266 log_debug_errno(r, "Failed to determine whether '%s' is below autofs, ignoring: %m", i->path);
2267
2268 r = FLAGS_SET(operation, OPERATION_CREATE) ? create_item(i) : 0;
2269 /* Failure can only be tolerated for create */
2270 if (i->allow_failure)
2271 r = 0;
2272
2273 q = FLAGS_SET(operation, OPERATION_REMOVE) ? remove_item(i) : 0;
2274 p = FLAGS_SET(operation, OPERATION_CLEAN) ? clean_item(i) : 0;
2275
2276 return r < 0 ? r :
2277 q < 0 ? q :
2278 p;
2279 }
2280
2281 static int process_item_array(ItemArray *array, OperationMask operation) {
2282 int r = 0;
2283 size_t n;
2284
2285 assert(array);
2286
2287 /* Create any parent first. */
2288 if (FLAGS_SET(operation, OPERATION_CREATE) && array->parent)
2289 r = process_item_array(array->parent, operation & OPERATION_CREATE);
2290
2291 /* Clean up all children first */
2292 if ((operation & (OPERATION_REMOVE|OPERATION_CLEAN)) && !set_isempty(array->children)) {
2293 Iterator i;
2294 ItemArray *c;
2295
2296 SET_FOREACH(c, array->children, i) {
2297 int k;
2298
2299 k = process_item_array(c, operation & (OPERATION_REMOVE|OPERATION_CLEAN));
2300 if (k < 0 && r == 0)
2301 r = k;
2302 }
2303 }
2304
2305 for (n = 0; n < array->n_items; n++) {
2306 int k;
2307
2308 k = process_item(array->items + n, operation);
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 ItemArray* item_array_free(ItemArray *a) {
2329 size_t n;
2330
2331 if (!a)
2332 return NULL;
2333
2334 for (n = 0; n < a->n_items; n++)
2335 item_free_contents(a->items + n);
2336
2337 set_free(a->children);
2338 free(a->items);
2339 return mfree(a);
2340 }
2341
2342 static int item_compare(const Item *a, const Item *b) {
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(a->type) && !takes_ownership(b->type))
2347 return -1;
2348 if (!takes_ownership(a->type) && takes_ownership(b->type))
2349 return 1;
2350
2351 return CMP(a->type, b->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)
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 = path_join("/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 log_syntax(NULL, LOG_NOTICE, fname, line, 0, "Line references path below legacy directory /var/run/, updating %s → %s; please update the tmpfiles.d/ drop-in file accordingly.", *path, n);
2484
2485 free_and_replace(*path, n);
2486
2487 return 0;
2488 }
2489
2490 static int parse_line(const char *fname, unsigned line, const char *buffer, bool *invalid_config) {
2491
2492 _cleanup_free_ char *action = NULL, *mode = NULL, *user = NULL, *group = NULL, *age = NULL, *path = NULL;
2493 _cleanup_(item_free_contents) Item i = {};
2494 ItemArray *existing;
2495 OrderedHashmap *h;
2496 int r, pos;
2497 bool append_or_force = false, boot = false, allow_failure = false;
2498
2499 assert(fname);
2500 assert(line >= 1);
2501 assert(buffer);
2502
2503 r = extract_many_words(
2504 &buffer,
2505 NULL,
2506 EXTRACT_UNQUOTE,
2507 &action,
2508 &path,
2509 &mode,
2510 &user,
2511 &group,
2512 &age,
2513 NULL);
2514 if (r < 0) {
2515 if (IN_SET(r, -EINVAL, -EBADSLT))
2516 /* invalid quoting and such or an unknown specifier */
2517 *invalid_config = true;
2518 return log_error_errno(r, "[%s:%u] Failed to parse line: %m", fname, line);
2519 } else if (r < 2) {
2520 *invalid_config = true;
2521 log_error("[%s:%u] Syntax error.", fname, line);
2522 return -EIO;
2523 }
2524
2525 if (!empty_or_dash(buffer)) {
2526 i.argument = strdup(buffer);
2527 if (!i.argument)
2528 return log_oom();
2529 }
2530
2531 if (isempty(action)) {
2532 *invalid_config = true;
2533 log_error("[%s:%u] Command too short '%s'.", fname, line, action);
2534 return -EINVAL;
2535 }
2536
2537 for (pos = 1; action[pos]; pos++) {
2538 if (action[pos] == '!' && !boot)
2539 boot = true;
2540 else if (action[pos] == '+' && !append_or_force)
2541 append_or_force = true;
2542 else if (action[pos] == '-' && !allow_failure)
2543 allow_failure = 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.append_or_force = append_or_force;
2560 i.allow_failure = allow_failure;
2561
2562 r = specifier_printf(path, specifier_table, NULL, &i.path);
2563 if (r == -ENXIO)
2564 return log_unresolvable_specifier(fname, line);
2565 if (r < 0) {
2566 if (IN_SET(r, -EINVAL, -EBADSLT))
2567 *invalid_config = true;
2568 return log_error_errno(r, "[%s:%u] Failed to replace specifiers: %s", fname, line, path);
2569 }
2570
2571 r = patch_var_run(fname, line, &i.path);
2572 if (r < 0)
2573 return r;
2574
2575 switch (i.type) {
2576
2577 case CREATE_DIRECTORY:
2578 case CREATE_SUBVOLUME:
2579 case CREATE_SUBVOLUME_INHERIT_QUOTA:
2580 case CREATE_SUBVOLUME_NEW_QUOTA:
2581 case EMPTY_DIRECTORY:
2582 case TRUNCATE_DIRECTORY:
2583 case CREATE_FIFO:
2584 case IGNORE_PATH:
2585 case IGNORE_DIRECTORY_PATH:
2586 case REMOVE_PATH:
2587 case RECURSIVE_REMOVE_PATH:
2588 case ADJUST_MODE:
2589 case RELABEL_PATH:
2590 case RECURSIVE_RELABEL_PATH:
2591 if (i.argument)
2592 log_warning("[%s:%u] %c lines don't take argument fields, ignoring.", fname, line, i.type);
2593
2594 break;
2595
2596 case CREATE_FILE:
2597 case TRUNCATE_FILE:
2598 break;
2599
2600 case CREATE_SYMLINK:
2601 if (!i.argument) {
2602 i.argument = path_join("/usr/share/factory", i.path);
2603 if (!i.argument)
2604 return log_oom();
2605 }
2606 break;
2607
2608 case WRITE_FILE:
2609 if (!i.argument) {
2610 *invalid_config = true;
2611 log_error("[%s:%u] Write file requires argument.", fname, line);
2612 return -EBADMSG;
2613 }
2614 break;
2615
2616 case COPY_FILES:
2617 if (!i.argument) {
2618 i.argument = path_join(arg_root, "/usr/share/factory", i.path);
2619 if (!i.argument)
2620 return log_oom();
2621
2622 } else if (!path_is_absolute(i.argument)) {
2623 *invalid_config = true;
2624 log_error("[%s:%u] Source path is not absolute.", fname, line);
2625 return -EBADMSG;
2626
2627 } else if (arg_root) {
2628 char *p;
2629
2630 p = path_join(arg_root, i.argument);
2631 if (!p)
2632 return log_oom();
2633 free_and_replace(i.argument, p);
2634 }
2635
2636 path_simplify(i.argument, false);
2637 break;
2638
2639 case CREATE_CHAR_DEVICE:
2640 case CREATE_BLOCK_DEVICE:
2641 if (!i.argument) {
2642 *invalid_config = true;
2643 log_error("[%s:%u] Device file requires argument.", fname, line);
2644 return -EBADMSG;
2645 }
2646
2647 r = parse_dev(i.argument, &i.major_minor);
2648 if (r < 0) {
2649 *invalid_config = true;
2650 log_error_errno(r, "[%s:%u] Can't parse device file major/minor '%s'.", fname, line, i.argument);
2651 return -EBADMSG;
2652 }
2653
2654 break;
2655
2656 case SET_XATTR:
2657 case RECURSIVE_SET_XATTR:
2658 if (!i.argument) {
2659 *invalid_config = true;
2660 log_error("[%s:%u] Set extended attribute requires argument.", fname, line);
2661 return -EBADMSG;
2662 }
2663 r = parse_xattrs_from_arg(&i);
2664 if (r < 0)
2665 return r;
2666 break;
2667
2668 case SET_ACL:
2669 case RECURSIVE_SET_ACL:
2670 if (!i.argument) {
2671 *invalid_config = true;
2672 log_error("[%s:%u] Set ACLs requires argument.", fname, line);
2673 return -EBADMSG;
2674 }
2675 r = parse_acls_from_arg(&i);
2676 if (r < 0)
2677 return r;
2678 break;
2679
2680 case SET_ATTRIBUTE:
2681 case RECURSIVE_SET_ATTRIBUTE:
2682 if (!i.argument) {
2683 *invalid_config = true;
2684 log_error("[%s:%u] Set file attribute requires argument.", fname, line);
2685 return -EBADMSG;
2686 }
2687 r = parse_attribute_from_arg(&i);
2688 if (IN_SET(r, -EINVAL, -EBADSLT))
2689 *invalid_config = true;
2690 if (r < 0)
2691 return r;
2692 break;
2693
2694 default:
2695 log_error("[%s:%u] Unknown command type '%c'.", fname, line, (char) i.type);
2696 *invalid_config = true;
2697 return -EBADMSG;
2698 }
2699
2700 if (!path_is_absolute(i.path)) {
2701 log_error("[%s:%u] Path '%s' not absolute.", fname, line, i.path);
2702 *invalid_config = true;
2703 return -EBADMSG;
2704 }
2705
2706 path_simplify(i.path, false);
2707
2708 if (!should_include_path(i.path))
2709 return 0;
2710
2711 r = specifier_expansion_from_arg(&i);
2712 if (r == -ENXIO)
2713 return log_unresolvable_specifier(fname, line);
2714 if (r < 0) {
2715 if (IN_SET(r, -EINVAL, -EBADSLT))
2716 *invalid_config = true;
2717 return log_error_errno(r, "[%s:%u] Failed to substitute specifiers in argument: %m",
2718 fname, line);
2719 }
2720
2721 if (arg_root) {
2722 char *p;
2723
2724 p = path_join(arg_root, i.path);
2725 if (!p)
2726 return log_oom();
2727 free_and_replace(i.path, p);
2728 }
2729
2730 if (!empty_or_dash(user)) {
2731 const char *u = user;
2732
2733 r = get_user_creds(&u, &i.uid, NULL, NULL, NULL, USER_CREDS_ALLOW_MISSING);
2734 if (r < 0) {
2735 *invalid_config = true;
2736 return log_error_errno(r, "[%s:%u] Unknown user '%s'.", fname, line, user);
2737 }
2738
2739 i.uid_set = true;
2740 }
2741
2742 if (!empty_or_dash(group)) {
2743 const char *g = group;
2744
2745 r = get_group_creds(&g, &i.gid, USER_CREDS_ALLOW_MISSING);
2746 if (r < 0) {
2747 *invalid_config = true;
2748 log_error("[%s:%u] Unknown group '%s'.", fname, line, group);
2749 return r;
2750 }
2751
2752 i.gid_set = true;
2753 }
2754
2755 if (!empty_or_dash(mode)) {
2756 const char *mm = mode;
2757 unsigned m;
2758
2759 if (*mm == '~') {
2760 i.mask_perms = true;
2761 mm++;
2762 }
2763
2764 if (parse_mode(mm, &m) < 0) {
2765 *invalid_config = true;
2766 log_error("[%s:%u] Invalid mode '%s'.", fname, line, mode);
2767 return -EBADMSG;
2768 }
2769
2770 i.mode = m;
2771 i.mode_set = true;
2772 } else
2773 i.mode = IN_SET(i.type, CREATE_DIRECTORY, TRUNCATE_DIRECTORY, CREATE_SUBVOLUME, CREATE_SUBVOLUME_INHERIT_QUOTA, CREATE_SUBVOLUME_NEW_QUOTA) ? 0755 : 0644;
2774
2775 if (!empty_or_dash(age)) {
2776 const char *a = age;
2777
2778 if (*a == '~') {
2779 i.keep_first_level = true;
2780 a++;
2781 }
2782
2783 if (parse_sec(a, &i.age) < 0) {
2784 *invalid_config = true;
2785 log_error("[%s:%u] Invalid age '%s'.", fname, line, age);
2786 return -EBADMSG;
2787 }
2788
2789 i.age_set = true;
2790 }
2791
2792 h = needs_glob(i.type) ? globs : items;
2793
2794 existing = ordered_hashmap_get(h, i.path);
2795 if (existing) {
2796 size_t n;
2797
2798 for (n = 0; n < existing->n_items; n++) {
2799 if (!item_compatible(existing->items + n, &i) && !i.append_or_force) {
2800 log_notice("[%s:%u] Duplicate line for path \"%s\", ignoring.",
2801 fname, line, i.path);
2802 return 0;
2803 }
2804 }
2805 } else {
2806 existing = new0(ItemArray, 1);
2807 if (!existing)
2808 return log_oom();
2809
2810 r = ordered_hashmap_put(h, i.path, existing);
2811 if (r < 0) {
2812 free(existing);
2813 return log_oom();
2814 }
2815 }
2816
2817 if (!GREEDY_REALLOC(existing->items, existing->allocated, existing->n_items + 1))
2818 return log_oom();
2819
2820 existing->items[existing->n_items++] = i;
2821 i = (struct Item) {};
2822
2823 /* Sort item array, to enforce stable ordering of application */
2824 typesafe_qsort(existing->items, existing->n_items, item_compare);
2825
2826 return 0;
2827 }
2828
2829 static int cat_config(char **config_dirs, char **args) {
2830 _cleanup_strv_free_ char **files = NULL;
2831 int r;
2832
2833 r = conf_files_list_with_replacement(arg_root, config_dirs, arg_replace, &files, NULL);
2834 if (r < 0)
2835 return r;
2836
2837 return cat_files(NULL, files, 0);
2838 }
2839
2840 static int help(void) {
2841 _cleanup_free_ char *link = NULL;
2842 int r;
2843
2844 r = terminal_urlify_man("systemd-tmpfiles", "8", &link);
2845 if (r < 0)
2846 return log_oom();
2847
2848 printf("%s [OPTIONS...] [CONFIGURATION FILE...]\n\n"
2849 "Creates, deletes and cleans up volatile and temporary files and directories.\n\n"
2850 " -h --help Show this help\n"
2851 " --user Execute user configuration\n"
2852 " --version Show package version\n"
2853 " --cat-config Show configuration files\n"
2854 " --create Create marked files/directories\n"
2855 " --clean Clean up marked directories\n"
2856 " --remove Remove marked files/directories\n"
2857 " --boot Execute actions only safe at boot\n"
2858 " --prefix=PATH Only apply rules with the specified prefix\n"
2859 " --exclude-prefix=PATH Ignore rules with the specified prefix\n"
2860 " --root=PATH Operate on an alternate filesystem root\n"
2861 " --replace=PATH Treat arguments as replacement for PATH\n"
2862 " --no-pager Do not pipe output into a pager\n"
2863 "\nSee the %s for details.\n"
2864 , program_invocation_short_name
2865 , link
2866 );
2867
2868 return 0;
2869 }
2870
2871 static int parse_argv(int argc, char *argv[]) {
2872
2873 enum {
2874 ARG_VERSION = 0x100,
2875 ARG_CAT_CONFIG,
2876 ARG_USER,
2877 ARG_CREATE,
2878 ARG_CLEAN,
2879 ARG_REMOVE,
2880 ARG_BOOT,
2881 ARG_PREFIX,
2882 ARG_EXCLUDE_PREFIX,
2883 ARG_ROOT,
2884 ARG_REPLACE,
2885 ARG_NO_PAGER,
2886 };
2887
2888 static const struct option options[] = {
2889 { "help", no_argument, NULL, 'h' },
2890 { "user", no_argument, NULL, ARG_USER },
2891 { "version", no_argument, NULL, ARG_VERSION },
2892 { "cat-config", no_argument, NULL, ARG_CAT_CONFIG },
2893 { "create", no_argument, NULL, ARG_CREATE },
2894 { "clean", no_argument, NULL, ARG_CLEAN },
2895 { "remove", no_argument, NULL, ARG_REMOVE },
2896 { "boot", no_argument, NULL, ARG_BOOT },
2897 { "prefix", required_argument, NULL, ARG_PREFIX },
2898 { "exclude-prefix", required_argument, NULL, ARG_EXCLUDE_PREFIX },
2899 { "root", required_argument, NULL, ARG_ROOT },
2900 { "replace", required_argument, NULL, ARG_REPLACE },
2901 { "no-pager", no_argument, NULL, ARG_NO_PAGER },
2902 {}
2903 };
2904
2905 int c, r;
2906
2907 assert(argc >= 0);
2908 assert(argv);
2909
2910 while ((c = getopt_long(argc, argv, "h", options, NULL)) >= 0)
2911
2912 switch (c) {
2913
2914 case 'h':
2915 return help();
2916
2917 case ARG_VERSION:
2918 return version();
2919
2920 case ARG_CAT_CONFIG:
2921 arg_cat_config = true;
2922 break;
2923
2924 case ARG_USER:
2925 arg_user = true;
2926 break;
2927
2928 case ARG_CREATE:
2929 arg_operation |= OPERATION_CREATE;
2930 break;
2931
2932 case ARG_CLEAN:
2933 arg_operation |= OPERATION_CLEAN;
2934 break;
2935
2936 case ARG_REMOVE:
2937 arg_operation |= OPERATION_REMOVE;
2938 break;
2939
2940 case ARG_BOOT:
2941 arg_boot = true;
2942 break;
2943
2944 case ARG_PREFIX:
2945 if (strv_push(&arg_include_prefixes, optarg) < 0)
2946 return log_oom();
2947 break;
2948
2949 case ARG_EXCLUDE_PREFIX:
2950 if (strv_push(&arg_exclude_prefixes, optarg) < 0)
2951 return log_oom();
2952 break;
2953
2954 case ARG_ROOT:
2955 r = parse_path_argument_and_warn(optarg, true, &arg_root);
2956 if (r < 0)
2957 return r;
2958 break;
2959
2960 case ARG_REPLACE:
2961 if (!path_is_absolute(optarg) ||
2962 !endswith(optarg, ".conf"))
2963 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
2964 "The argument to --replace= must an absolute path to a config file");
2965
2966 arg_replace = optarg;
2967 break;
2968
2969 case ARG_NO_PAGER:
2970 arg_pager_flags |= PAGER_DISABLE;
2971 break;
2972
2973 case '?':
2974 return -EINVAL;
2975
2976 default:
2977 assert_not_reached("Unhandled option");
2978 }
2979
2980 if (arg_operation == 0 && !arg_cat_config)
2981 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
2982 "You need to specify at least one of --clean, --create or --remove.");
2983
2984 if (arg_replace && arg_cat_config)
2985 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
2986 "Option --replace= is not supported with --cat-config");
2987
2988 if (arg_replace && optind >= argc)
2989 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
2990 "When --replace= is given, some configuration items must be specified");
2991
2992 return 1;
2993 }
2994
2995 static int read_config_file(char **config_dirs, const char *fn, bool ignore_enoent, bool *invalid_config) {
2996 _cleanup_fclose_ FILE *_f = NULL;
2997 Iterator iterator;
2998 unsigned v = 0;
2999 FILE *f;
3000 Item *i;
3001 int r = 0;
3002
3003 assert(fn);
3004
3005 if (streq(fn, "-")) {
3006 log_debug("Reading config from stdin…");
3007 fn = "<stdin>";
3008 f = stdin;
3009 } else {
3010 r = search_and_fopen(fn, "re", arg_root, (const char**) config_dirs, &_f);
3011 if (r < 0) {
3012 if (ignore_enoent && r == -ENOENT) {
3013 log_debug_errno(r, "Failed to open \"%s\", ignoring: %m", fn);
3014 return 0;
3015 }
3016
3017 return log_error_errno(r, "Failed to open '%s': %m", fn);
3018 }
3019 log_debug("Reading config file \"%s\"…", fn);
3020 f = _f;
3021 }
3022
3023 for (;;) {
3024 _cleanup_free_ char *line = NULL;
3025 bool invalid_line = false;
3026 char *l;
3027 int k;
3028
3029 k = read_line(f, LONG_LINE_MAX, &line);
3030 if (k < 0)
3031 return log_error_errno(k, "Failed to read '%s': %m", fn);
3032 if (k == 0)
3033 break;
3034
3035 v++;
3036
3037 l = strstrip(line);
3038 if (IN_SET(*l, 0, '#'))
3039 continue;
3040
3041 k = parse_line(fn, v, l, &invalid_line);
3042 if (k < 0) {
3043 if (invalid_line)
3044 /* Allow reporting with a special code if the caller requested this */
3045 *invalid_config = true;
3046 else if (r == 0)
3047 /* The first error becomes our return value */
3048 r = k;
3049 }
3050 }
3051
3052 /* we have to determine age parameter for each entry of type X */
3053 ORDERED_HASHMAP_FOREACH(i, globs, iterator) {
3054 Iterator iter;
3055 Item *j, *candidate_item = NULL;
3056
3057 if (i->type != IGNORE_DIRECTORY_PATH)
3058 continue;
3059
3060 ORDERED_HASHMAP_FOREACH(j, items, iter) {
3061 if (!IN_SET(j->type, CREATE_DIRECTORY, TRUNCATE_DIRECTORY, CREATE_SUBVOLUME, CREATE_SUBVOLUME_INHERIT_QUOTA, CREATE_SUBVOLUME_NEW_QUOTA))
3062 continue;
3063
3064 if (path_equal(j->path, i->path)) {
3065 candidate_item = j;
3066 break;
3067 }
3068
3069 if ((!candidate_item && path_startswith(i->path, j->path)) ||
3070 (candidate_item && path_startswith(j->path, candidate_item->path) && (fnmatch(i->path, j->path, FNM_PATHNAME | FNM_PERIOD) == 0)))
3071 candidate_item = j;
3072 }
3073
3074 if (candidate_item && candidate_item->age_set) {
3075 i->age = candidate_item->age;
3076 i->age_set = true;
3077 }
3078 }
3079
3080 if (ferror(f)) {
3081 log_error_errno(errno, "Failed to read from file %s: %m", fn);
3082 if (r == 0)
3083 r = -EIO;
3084 }
3085
3086 return r;
3087 }
3088
3089 static int parse_arguments(char **config_dirs, char **args, bool *invalid_config) {
3090 char **arg;
3091 int r;
3092
3093 STRV_FOREACH(arg, args) {
3094 r = read_config_file(config_dirs, *arg, false, invalid_config);
3095 if (r < 0)
3096 return r;
3097 }
3098
3099 return 0;
3100 }
3101
3102 static int read_config_files(char **config_dirs, char **args, bool *invalid_config) {
3103 _cleanup_strv_free_ char **files = NULL;
3104 _cleanup_free_ char *p = NULL;
3105 char **f;
3106 int r;
3107
3108 r = conf_files_list_with_replacement(arg_root, config_dirs, arg_replace, &files, &p);
3109 if (r < 0)
3110 return r;
3111
3112 STRV_FOREACH(f, files)
3113 if (p && path_equal(*f, p)) {
3114 log_debug("Parsing arguments at position \"%s\"…", *f);
3115
3116 r = parse_arguments(config_dirs, args, invalid_config);
3117 if (r < 0)
3118 return r;
3119 } else
3120 /* Just warn, ignore result otherwise.
3121 * read_config_file() has some debug output, so no need to print anything. */
3122 (void) read_config_file(config_dirs, *f, true, invalid_config);
3123
3124 return 0;
3125 }
3126
3127 static int link_parent(ItemArray *a) {
3128 const char *path;
3129 char *prefix;
3130 int r;
3131
3132 assert(a);
3133
3134 /* Finds the closest "parent" item array for the specified item array. Then registers the specified item array
3135 * as child of it, and fills the parent in, linking them both ways. This allows us to later create parents
3136 * before their children, and clean up/remove children before their parents. */
3137
3138 if (a->n_items <= 0)
3139 return 0;
3140
3141 path = a->items[0].path;
3142 prefix = newa(char, strlen(path) + 1);
3143 PATH_FOREACH_PREFIX(prefix, path) {
3144 ItemArray *j;
3145
3146 j = ordered_hashmap_get(items, prefix);
3147 if (!j)
3148 j = ordered_hashmap_get(globs, prefix);
3149 if (j) {
3150 r = set_ensure_allocated(&j->children, NULL);
3151 if (r < 0)
3152 return log_oom();
3153
3154 r = set_put(j->children, a);
3155 if (r < 0)
3156 return log_oom();
3157
3158 a->parent = j;
3159 return 1;
3160 }
3161 }
3162
3163 return 0;
3164 }
3165
3166 DEFINE_PRIVATE_HASH_OPS_WITH_VALUE_DESTRUCTOR(item_array_hash_ops, char, string_hash_func, string_compare_func,
3167 ItemArray, item_array_free);
3168
3169 static int run(int argc, char *argv[]) {
3170 _cleanup_strv_free_ char **config_dirs = NULL;
3171 bool invalid_config = false;
3172 Iterator iterator;
3173 ItemArray *a;
3174 enum {
3175 PHASE_REMOVE_AND_CLEAN,
3176 PHASE_CREATE,
3177 _PHASE_MAX
3178 } phase;
3179 int r, k;
3180
3181 r = parse_argv(argc, argv);
3182 if (r <= 0)
3183 return r;
3184
3185 log_setup_service();
3186
3187 /* Descending down file system trees might take a lot of fds */
3188 (void) rlimit_nofile_bump(HIGH_RLIMIT_NOFILE);
3189
3190 if (arg_user) {
3191 r = user_config_paths(&config_dirs);
3192 if (r < 0)
3193 return log_error_errno(r, "Failed to initialize configuration directory list: %m");
3194 } else {
3195 config_dirs = strv_split_nulstr(CONF_PATHS_NULSTR("tmpfiles.d"));
3196 if (!config_dirs)
3197 return log_oom();
3198 }
3199
3200 if (DEBUG_LOGGING) {
3201 _cleanup_free_ char *t = NULL;
3202
3203 t = strv_join(config_dirs, "\n\t");
3204 if (t)
3205 log_debug("Looking for configuration files in (higher priority first):\n\t%s", t);
3206 }
3207
3208 if (arg_cat_config) {
3209 (void) pager_open(arg_pager_flags);
3210
3211 return cat_config(config_dirs, argv + optind);
3212 }
3213
3214 umask(0022);
3215
3216 mac_selinux_init();
3217
3218 items = ordered_hashmap_new(&item_array_hash_ops);
3219 globs = ordered_hashmap_new(&item_array_hash_ops);
3220 if (!items || !globs)
3221 return log_oom();
3222
3223 /* If command line arguments are specified along with --replace, read all
3224 * configuration files and insert the positional arguments at the specified
3225 * place. Otherwise, if command line arguments are specified, execute just
3226 * them, and finally, without --replace= or any positional arguments, just
3227 * read configuration and execute it.
3228 */
3229 if (arg_replace || optind >= argc)
3230 r = read_config_files(config_dirs, argv + optind, &invalid_config);
3231 else
3232 r = parse_arguments(config_dirs, argv + optind, &invalid_config);
3233 if (r < 0)
3234 return r;
3235
3236 /* Let's now link up all child/parent relationships */
3237 ORDERED_HASHMAP_FOREACH(a, items, iterator) {
3238 r = link_parent(a);
3239 if (r < 0)
3240 return r;
3241 }
3242 ORDERED_HASHMAP_FOREACH(a, globs, iterator) {
3243 r = link_parent(a);
3244 if (r < 0)
3245 return r;
3246 }
3247
3248 /* If multiple operations are requested, let's first run the remove/clean operations, and only then the create
3249 * operations. i.e. that we first clean out the platform we then build on. */
3250 for (phase = 0; phase < _PHASE_MAX; phase++) {
3251 OperationMask op;
3252
3253 if (phase == PHASE_REMOVE_AND_CLEAN)
3254 op = arg_operation & (OPERATION_REMOVE|OPERATION_CLEAN);
3255 else if (phase == PHASE_CREATE)
3256 op = arg_operation & OPERATION_CREATE;
3257 else
3258 assert_not_reached("unexpected phase");
3259
3260 if (op == 0) /* Nothing requested in this phase */
3261 continue;
3262
3263 /* The non-globbing ones usually create things, hence we apply them first */
3264 ORDERED_HASHMAP_FOREACH(a, items, iterator) {
3265 k = process_item_array(a, op);
3266 if (k < 0 && r >= 0)
3267 r = k;
3268 }
3269
3270 /* The globbing ones usually alter things, hence we apply them second. */
3271 ORDERED_HASHMAP_FOREACH(a, globs, iterator) {
3272 k = process_item_array(a, op);
3273 if (k < 0 && r >= 0)
3274 r = k;
3275 }
3276 }
3277
3278 if (ERRNO_IS_RESOURCE(-r))
3279 return r;
3280 if (invalid_config)
3281 return EX_DATAERR;
3282 if (r < 0)
3283 return EX_CANTCREAT;
3284 return 0;
3285 }
3286
3287 DEFINE_MAIN_FUNCTION_WITH_POSITIVE_FAILURE(run);
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