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coccinelle: make use of SYNTHETIC_ERRNO
[thirdparty/systemd.git] / src / tmpfiles / tmpfiles.c
1 /* SPDX-License-Identifier: LGPL-2.1+ */
2
3 #include <errno.h>
4 #include <fcntl.h>
5 #include <fnmatch.h>
6 #include <getopt.h>
7 #include <glob.h>
8 #include <limits.h>
9 #include <linux/fs.h>
10 #include <stdbool.h>
11 #include <stddef.h>
12 #include <stdio.h>
13 #include <stdlib.h>
14 #include <string.h>
15 #include <sys/stat.h>
16 #include <sys/xattr.h>
17 #include <sysexits.h>
18 #include <time.h>
19 #include <unistd.h>
20
21 #include "sd-path.h"
22
23 #include "acl-util.h"
24 #include "alloc-util.h"
25 #include "btrfs-util.h"
26 #include "capability-util.h"
27 #include "chattr-util.h"
28 #include "conf-files.h"
29 #include "copy.h"
30 #include "def.h"
31 #include "dirent-util.h"
32 #include "escape.h"
33 #include "fd-util.h"
34 #include "fileio.h"
35 #include "format-util.h"
36 #include "fs-util.h"
37 #include "glob-util.h"
38 #include "io-util.h"
39 #include "label.h"
40 #include "log.h"
41 #include "macro.h"
42 #include "missing.h"
43 #include "mkdir.h"
44 #include "mount-util.h"
45 #include "pager.h"
46 #include "parse-util.h"
47 #include "path-lookup.h"
48 #include "path-util.h"
49 #include "pretty-print.h"
50 #include "rm-rf.h"
51 #include "selinux-util.h"
52 #include "set.h"
53 #include "specifier.h"
54 #include "stat-util.h"
55 #include "stdio-util.h"
56 #include "string-table.h"
57 #include "string-util.h"
58 #include "strv.h"
59 #include "umask-util.h"
60 #include "user-util.h"
61 #include "util.h"
62
63 /* This reads all files listed in /etc/tmpfiles.d/?*.conf and creates
64 * them in the file system. This is intended to be used to create
65 * properly owned directories beneath /tmp, /var/tmp, /run, which are
66 * volatile and hence need to be recreated on bootup. */
67
68 typedef enum OperationMask {
69 OPERATION_CREATE = 1 << 0,
70 OPERATION_REMOVE = 1 << 1,
71 OPERATION_CLEAN = 1 << 2,
72 } OperationMask;
73
74 typedef enum ItemType {
75 /* These ones take file names */
76 CREATE_FILE = 'f',
77 TRUNCATE_FILE = 'F',
78 CREATE_DIRECTORY = 'd',
79 TRUNCATE_DIRECTORY = 'D',
80 CREATE_SUBVOLUME = 'v',
81 CREATE_SUBVOLUME_INHERIT_QUOTA = 'q',
82 CREATE_SUBVOLUME_NEW_QUOTA = 'Q',
83 CREATE_FIFO = 'p',
84 CREATE_SYMLINK = 'L',
85 CREATE_CHAR_DEVICE = 'c',
86 CREATE_BLOCK_DEVICE = 'b',
87 COPY_FILES = 'C',
88
89 /* These ones take globs */
90 WRITE_FILE = 'w',
91 EMPTY_DIRECTORY = 'e',
92 SET_XATTR = 't',
93 RECURSIVE_SET_XATTR = 'T',
94 SET_ACL = 'a',
95 RECURSIVE_SET_ACL = 'A',
96 SET_ATTRIBUTE = 'h',
97 RECURSIVE_SET_ATTRIBUTE = 'H',
98 IGNORE_PATH = 'x',
99 IGNORE_DIRECTORY_PATH = 'X',
100 REMOVE_PATH = 'r',
101 RECURSIVE_REMOVE_PATH = 'R',
102 RELABEL_PATH = 'z',
103 RECURSIVE_RELABEL_PATH = 'Z',
104 ADJUST_MODE = 'm', /* legacy, 'z' is identical to this */
105 } ItemType;
106
107 typedef struct Item {
108 ItemType type;
109
110 char *path;
111 char *argument;
112 char **xattrs;
113 #if HAVE_ACL
114 acl_t acl_access;
115 acl_t acl_default;
116 #endif
117 uid_t uid;
118 gid_t gid;
119 mode_t mode;
120 usec_t age;
121
122 dev_t major_minor;
123 unsigned attribute_value;
124 unsigned attribute_mask;
125
126 bool uid_set:1;
127 bool gid_set:1;
128 bool mode_set:1;
129 bool age_set:1;
130 bool mask_perms:1;
131 bool attribute_set:1;
132
133 bool keep_first_level:1;
134
135 bool force:1;
136
137 bool allow_failure:1;
138
139 OperationMask done;
140 } Item;
141
142 typedef struct ItemArray {
143 Item *items;
144 size_t n_items;
145 size_t allocated;
146
147 struct ItemArray *parent;
148 Set *children;
149 } ItemArray;
150
151 typedef enum DirectoryType {
152 DIRECTORY_RUNTIME,
153 DIRECTORY_STATE,
154 DIRECTORY_CACHE,
155 DIRECTORY_LOGS,
156 _DIRECTORY_TYPE_MAX,
157 } DirectoryType;
158
159 static bool arg_cat_config = false;
160 static bool arg_user = false;
161 static OperationMask arg_operation = 0;
162 static bool arg_boot = false;
163 static PagerFlags arg_pager_flags = 0;
164
165 static char **arg_include_prefixes = NULL;
166 static char **arg_exclude_prefixes = NULL;
167 static char *arg_root = NULL;
168 static char *arg_replace = NULL;
169
170 #define MAX_DEPTH 256
171
172 static OrderedHashmap *items = NULL, *globs = NULL;
173 static Set *unix_sockets = NULL;
174
175 static int specifier_machine_id_safe(char specifier, void *data, void *userdata, char **ret);
176 static int specifier_directory(char specifier, void *data, void *userdata, char **ret);
177
178 static const Specifier specifier_table[] = {
179 { 'm', specifier_machine_id_safe, NULL },
180 { 'b', specifier_boot_id, NULL },
181 { 'H', specifier_host_name, NULL },
182 { 'v', specifier_kernel_release, NULL },
183
184 { 'g', specifier_group_name, NULL },
185 { 'G', specifier_group_id, NULL },
186 { 'U', specifier_user_id, NULL },
187 { 'u', specifier_user_name, NULL },
188 { 'h', specifier_user_home, NULL },
189
190 { 't', specifier_directory, UINT_TO_PTR(DIRECTORY_RUNTIME) },
191 { 'S', specifier_directory, UINT_TO_PTR(DIRECTORY_STATE) },
192 { 'C', specifier_directory, UINT_TO_PTR(DIRECTORY_CACHE) },
193 { 'L', specifier_directory, UINT_TO_PTR(DIRECTORY_LOGS) },
194 { 'T', specifier_tmp_dir, NULL },
195 { 'V', specifier_var_tmp_dir, NULL },
196 {}
197 };
198
199 static int specifier_machine_id_safe(char specifier, void *data, void *userdata, char **ret) {
200 int r;
201
202 /* If /etc/machine_id is missing or empty (e.g. in a chroot environment)
203 * return a recognizable error so that the caller can skip the rule
204 * gracefully. */
205
206 r = specifier_machine_id(specifier, data, userdata, ret);
207 if (IN_SET(r, -ENOENT, -ENOMEDIUM))
208 return -ENXIO;
209
210 return r;
211 }
212
213 static int specifier_directory(char specifier, void *data, void *userdata, char **ret) {
214 struct table_entry {
215 uint64_t type;
216 const char *suffix;
217 };
218
219 static const struct table_entry paths_system[] = {
220 [DIRECTORY_RUNTIME] = { SD_PATH_SYSTEM_RUNTIME },
221 [DIRECTORY_STATE] = { SD_PATH_SYSTEM_STATE_PRIVATE },
222 [DIRECTORY_CACHE] = { SD_PATH_SYSTEM_STATE_CACHE },
223 [DIRECTORY_LOGS] = { SD_PATH_SYSTEM_STATE_LOGS },
224 };
225
226 static const struct table_entry paths_user[] = {
227 [DIRECTORY_RUNTIME] = { SD_PATH_USER_RUNTIME },
228 [DIRECTORY_STATE] = { SD_PATH_USER_CONFIGURATION },
229 [DIRECTORY_CACHE] = { SD_PATH_USER_STATE_CACHE },
230 [DIRECTORY_LOGS] = { SD_PATH_USER_CONFIGURATION, "log" },
231 };
232
233 unsigned i;
234 const struct table_entry *paths;
235
236 assert_cc(ELEMENTSOF(paths_system) == ELEMENTSOF(paths_user));
237 paths = arg_user ? paths_user : paths_system;
238
239 i = PTR_TO_UINT(data);
240 assert(i < ELEMENTSOF(paths_system));
241
242 return sd_path_home(paths[i].type, paths[i].suffix, ret);
243 }
244
245 static int log_unresolvable_specifier(const char *filename, unsigned line) {
246 static bool notified = false;
247
248 /* In system mode, this is called when /etc is not fully initialized (e.g.
249 * in a chroot environment) where some specifiers are unresolvable. In user
250 * mode, this is called when some variables are not defined. These cases are
251 * not considered as an error so log at LOG_NOTICE only for the first time
252 * and then downgrade this to LOG_DEBUG for the rest. */
253
254 log_full(notified ? LOG_DEBUG : LOG_NOTICE,
255 "[%s:%u] Failed to resolve specifier: %s, skipping",
256 filename, line,
257 arg_user ? "Required $XDG_... variable not defined" : "uninitialized /etc detected");
258
259 if (!notified)
260 log_notice("All rules containing unresolvable specifiers will be skipped.");
261
262 notified = true;
263 return 0;
264 }
265
266 static int user_config_paths(char*** ret) {
267 _cleanup_strv_free_ char **config_dirs = NULL, **data_dirs = NULL;
268 _cleanup_free_ char *persistent_config = NULL, *runtime_config = NULL, *data_home = NULL;
269 _cleanup_strv_free_ char **res = NULL;
270 int r;
271
272 r = xdg_user_dirs(&config_dirs, &data_dirs);
273 if (r < 0)
274 return r;
275
276 r = xdg_user_config_dir(&persistent_config, "/user-tmpfiles.d");
277 if (r < 0 && r != -ENXIO)
278 return r;
279
280 r = xdg_user_runtime_dir(&runtime_config, "/user-tmpfiles.d");
281 if (r < 0 && r != -ENXIO)
282 return r;
283
284 r = xdg_user_data_dir(&data_home, "/user-tmpfiles.d");
285 if (r < 0 && r != -ENXIO)
286 return r;
287
288 r = strv_extend_strv_concat(&res, config_dirs, "/user-tmpfiles.d");
289 if (r < 0)
290 return r;
291
292 r = strv_extend(&res, persistent_config);
293 if (r < 0)
294 return r;
295
296 r = strv_extend(&res, runtime_config);
297 if (r < 0)
298 return r;
299
300 r = strv_extend(&res, data_home);
301 if (r < 0)
302 return r;
303
304 r = strv_extend_strv_concat(&res, data_dirs, "/user-tmpfiles.d");
305 if (r < 0)
306 return r;
307
308 r = path_strv_make_absolute_cwd(res);
309 if (r < 0)
310 return r;
311
312 *ret = TAKE_PTR(res);
313 return 0;
314 }
315
316 static bool needs_glob(ItemType t) {
317 return IN_SET(t,
318 WRITE_FILE,
319 IGNORE_PATH,
320 IGNORE_DIRECTORY_PATH,
321 REMOVE_PATH,
322 RECURSIVE_REMOVE_PATH,
323 EMPTY_DIRECTORY,
324 ADJUST_MODE,
325 RELABEL_PATH,
326 RECURSIVE_RELABEL_PATH,
327 SET_XATTR,
328 RECURSIVE_SET_XATTR,
329 SET_ACL,
330 RECURSIVE_SET_ACL,
331 SET_ATTRIBUTE,
332 RECURSIVE_SET_ATTRIBUTE);
333 }
334
335 static bool takes_ownership(ItemType t) {
336 return IN_SET(t,
337 CREATE_FILE,
338 TRUNCATE_FILE,
339 CREATE_DIRECTORY,
340 EMPTY_DIRECTORY,
341 TRUNCATE_DIRECTORY,
342 CREATE_SUBVOLUME,
343 CREATE_SUBVOLUME_INHERIT_QUOTA,
344 CREATE_SUBVOLUME_NEW_QUOTA,
345 CREATE_FIFO,
346 CREATE_SYMLINK,
347 CREATE_CHAR_DEVICE,
348 CREATE_BLOCK_DEVICE,
349 COPY_FILES,
350 WRITE_FILE,
351 IGNORE_PATH,
352 IGNORE_DIRECTORY_PATH,
353 REMOVE_PATH,
354 RECURSIVE_REMOVE_PATH);
355 }
356
357 static struct Item* find_glob(OrderedHashmap *h, const char *match) {
358 ItemArray *j;
359 Iterator i;
360
361 ORDERED_HASHMAP_FOREACH(j, h, i) {
362 size_t n;
363
364 for (n = 0; n < j->n_items; n++) {
365 Item *item = j->items + n;
366
367 if (fnmatch(item->path, match, FNM_PATHNAME|FNM_PERIOD) == 0)
368 return item;
369 }
370 }
371
372 return NULL;
373 }
374
375 static void load_unix_sockets(void) {
376 _cleanup_fclose_ FILE *f = NULL;
377 int r;
378
379 if (unix_sockets)
380 return;
381
382 /* We maintain a cache of the sockets we found in /proc/net/unix to speed things up a little. */
383
384 unix_sockets = set_new(&path_hash_ops);
385 if (!unix_sockets) {
386 log_oom();
387 return;
388 }
389
390 f = fopen("/proc/net/unix", "re");
391 if (!f) {
392 log_full_errno(errno == ENOENT ? LOG_DEBUG : LOG_WARNING, errno,
393 "Failed to open /proc/net/unix, ignoring: %m");
394 goto fail;
395 }
396
397 /* Skip header */
398 r = read_line(f, LONG_LINE_MAX, NULL);
399 if (r < 0) {
400 log_warning_errno(r, "Failed to skip /proc/net/unix header line: %m");
401 goto fail;
402 }
403 if (r == 0) {
404 log_warning("Premature end of file reading /proc/net/unix.");
405 goto fail;
406 }
407
408 for (;;) {
409 _cleanup_free_ char *line = NULL;
410 char *p, *s;
411
412 r = read_line(f, LONG_LINE_MAX, &line);
413 if (r < 0) {
414 log_warning_errno(r, "Failed to read /proc/net/unix line, ignoring: %m");
415 goto fail;
416 }
417 if (r == 0) /* EOF */
418 break;
419
420 p = strchr(line, ':');
421 if (!p)
422 continue;
423
424 if (strlen(p) < 37)
425 continue;
426
427 p += 37;
428 p += strspn(p, WHITESPACE);
429 p += strcspn(p, WHITESPACE); /* skip one more word */
430 p += strspn(p, WHITESPACE);
431
432 if (*p != '/')
433 continue;
434
435 s = strdup(p);
436 if (!s) {
437 log_oom();
438 goto fail;
439 }
440
441 path_simplify(s, false);
442
443 r = set_consume(unix_sockets, s);
444 if (r < 0 && r != -EEXIST) {
445 log_warning_errno(r, "Failed to add AF_UNIX socket to set, ignoring: %m");
446 goto fail;
447 }
448 }
449
450 return;
451
452 fail:
453 unix_sockets = set_free_free(unix_sockets);
454 }
455
456 static bool unix_socket_alive(const char *fn) {
457 assert(fn);
458
459 load_unix_sockets();
460
461 if (unix_sockets)
462 return !!set_get(unix_sockets, (char*) fn);
463
464 /* We don't know, so assume yes */
465 return true;
466 }
467
468 static int dir_is_mount_point(DIR *d, const char *subdir) {
469
470 int mount_id_parent, mount_id;
471 int r_p, r;
472
473 r_p = name_to_handle_at_loop(dirfd(d), ".", NULL, &mount_id_parent, 0);
474 if (r_p < 0)
475 r_p = -errno;
476
477 r = name_to_handle_at_loop(dirfd(d), subdir, NULL, &mount_id, 0);
478 if (r < 0)
479 r = -errno;
480
481 /* got no handle; make no assumptions, return error */
482 if (r_p < 0 && r < 0)
483 return r_p;
484
485 /* got both handles; if they differ, it is a mount point */
486 if (r_p >= 0 && r >= 0)
487 return mount_id_parent != mount_id;
488
489 /* got only one handle; assume different mount points if one
490 * of both queries was not supported by the filesystem */
491 if (IN_SET(r_p, -ENOSYS, -EOPNOTSUPP) || IN_SET(r, -ENOSYS, -EOPNOTSUPP))
492 return true;
493
494 /* return error */
495 if (r_p < 0)
496 return r_p;
497 return r;
498 }
499
500 static DIR* xopendirat_nomod(int dirfd, const char *path) {
501 DIR *dir;
502
503 dir = xopendirat(dirfd, path, O_NOFOLLOW|O_NOATIME);
504 if (dir)
505 return dir;
506
507 log_debug_errno(errno, "Cannot open %sdirectory \"%s\": %m", dirfd == AT_FDCWD ? "" : "sub", path);
508 if (errno != EPERM)
509 return NULL;
510
511 dir = xopendirat(dirfd, path, O_NOFOLLOW);
512 if (!dir)
513 log_debug_errno(errno, "Cannot open %sdirectory \"%s\": %m", dirfd == AT_FDCWD ? "" : "sub", path);
514
515 return dir;
516 }
517
518 static DIR* opendir_nomod(const char *path) {
519 return xopendirat_nomod(AT_FDCWD, path);
520 }
521
522 static int dir_cleanup(
523 Item *i,
524 const char *p,
525 DIR *d,
526 const struct stat *ds,
527 usec_t cutoff,
528 dev_t rootdev,
529 bool mountpoint,
530 int maxdepth,
531 bool keep_this_level) {
532
533 struct dirent *dent;
534 struct timespec times[2];
535 bool deleted = false;
536 int r = 0;
537
538 FOREACH_DIRENT_ALL(dent, d, break) {
539 struct stat s;
540 usec_t age;
541 _cleanup_free_ char *sub_path = NULL;
542
543 if (dot_or_dot_dot(dent->d_name))
544 continue;
545
546 if (fstatat(dirfd(d), dent->d_name, &s, AT_SYMLINK_NOFOLLOW) < 0) {
547 if (errno == ENOENT)
548 continue;
549
550 /* FUSE, NFS mounts, SELinux might return EACCES */
551 r = log_full_errno(errno == EACCES ? LOG_DEBUG : LOG_ERR, errno,
552 "stat(%s/%s) failed: %m", p, dent->d_name);
553 continue;
554 }
555
556 /* Stay on the same filesystem */
557 if (s.st_dev != rootdev) {
558 log_debug("Ignoring \"%s/%s\": different filesystem.", p, dent->d_name);
559 continue;
560 }
561
562 /* Try to detect bind mounts of the same filesystem instance; they
563 * do not differ in device major/minors. This type of query is not
564 * supported on all kernels or filesystem types though. */
565 if (S_ISDIR(s.st_mode) && dir_is_mount_point(d, dent->d_name) > 0) {
566 log_debug("Ignoring \"%s/%s\": different mount of the same filesystem.",
567 p, dent->d_name);
568 continue;
569 }
570
571 sub_path = strjoin(p, "/", dent->d_name);
572 if (!sub_path) {
573 r = log_oom();
574 goto finish;
575 }
576
577 /* Is there an item configured for this path? */
578 if (ordered_hashmap_get(items, sub_path)) {
579 log_debug("Ignoring \"%s\": a separate entry exists.", sub_path);
580 continue;
581 }
582
583 if (find_glob(globs, sub_path)) {
584 log_debug("Ignoring \"%s\": a separate glob exists.", sub_path);
585 continue;
586 }
587
588 if (S_ISDIR(s.st_mode)) {
589
590 if (mountpoint &&
591 streq(dent->d_name, "lost+found") &&
592 s.st_uid == 0) {
593 log_debug("Ignoring \"%s\".", sub_path);
594 continue;
595 }
596
597 if (maxdepth <= 0)
598 log_warning("Reached max depth on \"%s\".", sub_path);
599 else {
600 _cleanup_closedir_ DIR *sub_dir;
601 int q;
602
603 sub_dir = xopendirat_nomod(dirfd(d), dent->d_name);
604 if (!sub_dir) {
605 if (errno != ENOENT)
606 r = log_error_errno(errno, "opendir(%s) failed: %m", sub_path);
607
608 continue;
609 }
610
611 q = dir_cleanup(i, sub_path, sub_dir, &s, cutoff, rootdev, false, maxdepth-1, false);
612 if (q < 0)
613 r = q;
614 }
615
616 /* Note: if you are wondering why we don't
617 * support the sticky bit for excluding
618 * directories from cleaning like we do it for
619 * other file system objects: well, the sticky
620 * bit already has a meaning for directories,
621 * so we don't want to overload that. */
622
623 if (keep_this_level) {
624 log_debug("Keeping \"%s\".", sub_path);
625 continue;
626 }
627
628 /* Ignore ctime, we change it when deleting */
629 age = timespec_load(&s.st_mtim);
630 if (age >= cutoff) {
631 char a[FORMAT_TIMESTAMP_MAX];
632 /* Follows spelling in stat(1). */
633 log_debug("Directory \"%s\": modify time %s is too new.",
634 sub_path,
635 format_timestamp_us(a, sizeof(a), age));
636 continue;
637 }
638
639 age = timespec_load(&s.st_atim);
640 if (age >= cutoff) {
641 char a[FORMAT_TIMESTAMP_MAX];
642 log_debug("Directory \"%s\": access time %s is too new.",
643 sub_path,
644 format_timestamp_us(a, sizeof(a), age));
645 continue;
646 }
647
648 log_debug("Removing directory \"%s\".", sub_path);
649 if (unlinkat(dirfd(d), dent->d_name, AT_REMOVEDIR) < 0)
650 if (!IN_SET(errno, ENOENT, ENOTEMPTY))
651 r = log_error_errno(errno, "rmdir(%s): %m", sub_path);
652
653 } else {
654 /* Skip files for which the sticky bit is
655 * set. These are semantics we define, and are
656 * unknown elsewhere. See XDG_RUNTIME_DIR
657 * specification for details. */
658 if (s.st_mode & S_ISVTX) {
659 log_debug("Skipping \"%s\": sticky bit set.", sub_path);
660 continue;
661 }
662
663 if (mountpoint && S_ISREG(s.st_mode))
664 if (s.st_uid == 0 && STR_IN_SET(dent->d_name,
665 ".journal",
666 "aquota.user",
667 "aquota.group")) {
668 log_debug("Skipping \"%s\".", sub_path);
669 continue;
670 }
671
672 /* Ignore sockets that are listed in /proc/net/unix */
673 if (S_ISSOCK(s.st_mode) && unix_socket_alive(sub_path)) {
674 log_debug("Skipping \"%s\": live socket.", sub_path);
675 continue;
676 }
677
678 /* Ignore device nodes */
679 if (S_ISCHR(s.st_mode) || S_ISBLK(s.st_mode)) {
680 log_debug("Skipping \"%s\": a device.", sub_path);
681 continue;
682 }
683
684 /* Keep files on this level around if this is
685 * requested */
686 if (keep_this_level) {
687 log_debug("Keeping \"%s\".", sub_path);
688 continue;
689 }
690
691 age = timespec_load(&s.st_mtim);
692 if (age >= cutoff) {
693 char a[FORMAT_TIMESTAMP_MAX];
694 /* Follows spelling in stat(1). */
695 log_debug("File \"%s\": modify time %s is too new.",
696 sub_path,
697 format_timestamp_us(a, sizeof(a), age));
698 continue;
699 }
700
701 age = timespec_load(&s.st_atim);
702 if (age >= cutoff) {
703 char a[FORMAT_TIMESTAMP_MAX];
704 log_debug("File \"%s\": access time %s is too new.",
705 sub_path,
706 format_timestamp_us(a, sizeof(a), age));
707 continue;
708 }
709
710 age = timespec_load(&s.st_ctim);
711 if (age >= cutoff) {
712 char a[FORMAT_TIMESTAMP_MAX];
713 log_debug("File \"%s\": change time %s is too new.",
714 sub_path,
715 format_timestamp_us(a, sizeof(a), age));
716 continue;
717 }
718
719 log_debug("unlink \"%s\"", sub_path);
720
721 if (unlinkat(dirfd(d), dent->d_name, 0) < 0)
722 if (errno != ENOENT)
723 r = log_error_errno(errno, "unlink(%s): %m", sub_path);
724
725 deleted = true;
726 }
727 }
728
729 finish:
730 if (deleted) {
731 usec_t age1, age2;
732 char a[FORMAT_TIMESTAMP_MAX], b[FORMAT_TIMESTAMP_MAX];
733
734 /* Restore original directory timestamps */
735 times[0] = ds->st_atim;
736 times[1] = ds->st_mtim;
737
738 age1 = timespec_load(&ds->st_atim);
739 age2 = timespec_load(&ds->st_mtim);
740 log_debug("Restoring access and modification time on \"%s\": %s, %s",
741 p,
742 format_timestamp_us(a, sizeof(a), age1),
743 format_timestamp_us(b, sizeof(b), age2));
744 if (futimens(dirfd(d), times) < 0)
745 log_error_errno(errno, "utimensat(%s): %m", p);
746 }
747
748 return r;
749 }
750
751 static bool dangerous_hardlinks(void) {
752 _cleanup_free_ char *value = NULL;
753 static int cached = -1;
754 int r;
755
756 /* Check whether the fs.protected_hardlinks sysctl is on. If we can't determine it we assume its off, as that's
757 * what the upstream default is. */
758
759 if (cached >= 0)
760 return cached;
761
762 r = read_one_line_file("/proc/sys/fs/protected_hardlinks", &value);
763 if (r < 0) {
764 log_debug_errno(r, "Failed to read fs.protected_hardlinks sysctl: %m");
765 return true;
766 }
767
768 r = parse_boolean(value);
769 if (r < 0) {
770 log_debug_errno(r, "Failed to parse fs.protected_hardlinks sysctl: %m");
771 return true;
772 }
773
774 cached = r == 0;
775 return cached;
776 }
777
778 static bool hardlink_vulnerable(const struct stat *st) {
779 assert(st);
780
781 return !S_ISDIR(st->st_mode) && st->st_nlink > 1 && dangerous_hardlinks();
782 }
783
784 static int fd_set_perms(Item *i, int fd, const char *path, const struct stat *st) {
785 struct stat stbuf;
786
787 assert(i);
788 assert(fd);
789 assert(path);
790
791 if (!i->mode_set && !i->uid_set && !i->gid_set)
792 goto shortcut;
793
794 if (!st) {
795 if (fstat(fd, &stbuf) < 0)
796 return log_error_errno(errno, "fstat(%s) failed: %m", path);
797 st = &stbuf;
798 }
799
800 if (hardlink_vulnerable(st))
801 return log_error_errno(SYNTHETIC_ERRNO(EPERM),
802 "Refusing to set permissions on hardlinked file %s while the fs.protected_hardlinks sysctl is turned off.",
803 path);
804
805 if (i->mode_set) {
806 if (S_ISLNK(st->st_mode))
807 log_debug("Skipping mode fix for symlink %s.", path);
808 else {
809 mode_t m = i->mode;
810
811 if (i->mask_perms) {
812 if (!(st->st_mode & 0111))
813 m &= ~0111;
814 if (!(st->st_mode & 0222))
815 m &= ~0222;
816 if (!(st->st_mode & 0444))
817 m &= ~0444;
818 if (!S_ISDIR(st->st_mode))
819 m &= ~07000; /* remove sticky/sgid/suid bit, unless directory */
820 }
821
822 if (m == (st->st_mode & 07777))
823 log_debug("\"%s\" has correct mode %o already.", path, st->st_mode);
824 else {
825 log_debug("Changing \"%s\" to mode %o.", path, m);
826 if (fchmod_opath(fd, m) < 0)
827 return log_error_errno(errno, "fchmod() of %s failed: %m", path);
828 }
829 }
830 }
831
832 if ((i->uid_set && i->uid != st->st_uid) ||
833 (i->gid_set && i->gid != st->st_gid)) {
834 log_debug("Changing \"%s\" to owner "UID_FMT":"GID_FMT,
835 path,
836 i->uid_set ? i->uid : UID_INVALID,
837 i->gid_set ? i->gid : GID_INVALID);
838
839 if (fchownat(fd,
840 "",
841 i->uid_set ? i->uid : UID_INVALID,
842 i->gid_set ? i->gid : GID_INVALID,
843 AT_EMPTY_PATH) < 0)
844 return log_error_errno(errno, "fchownat() of %s failed: %m", path);
845 }
846
847 shortcut:
848 return label_fix(path, 0);
849 }
850
851 static int path_open_parent_safe(const char *path) {
852 _cleanup_free_ char *dn = NULL;
853 int fd;
854
855 if (path_equal(path, "/") || !path_is_normalized(path))
856 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
857 "Failed to open parent of '%s': invalid path.",
858 path);
859
860 dn = dirname_malloc(path);
861 if (!dn)
862 return log_oom();
863
864 fd = chase_symlinks(dn, NULL, CHASE_OPEN|CHASE_SAFE, NULL);
865 if (fd == -EPERM)
866 return log_error_errno(fd, "Unsafe symlinks encountered in %s, refusing.", path);
867 if (fd < 0)
868 return log_error_errno(fd, "Failed to validate path %s: %m", path);
869
870 return fd;
871 }
872
873 static int path_open_safe(const char *path) {
874 int fd;
875
876 /* path_open_safe() returns a file descriptor opened with O_PATH after
877 * verifying that the path doesn't contain unsafe transitions, except
878 * for its final component as the function does not follow symlink. */
879
880 assert(path);
881
882 if (!path_is_normalized(path))
883 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
884 "Failed to open invalid path '%s'.",
885 path);
886
887 fd = chase_symlinks(path, NULL, CHASE_OPEN|CHASE_SAFE|CHASE_NOFOLLOW, NULL);
888 if (fd == -EPERM)
889 return log_error_errno(fd, "Unsafe symlinks encountered in %s, refusing.", path);
890 if (fd < 0)
891 return log_error_errno(fd, "Failed to validate path %s: %m", path);
892
893 return fd;
894 }
895
896 static int path_set_perms(Item *i, const char *path) {
897 _cleanup_close_ int fd = -1;
898
899 assert(i);
900 assert(path);
901
902 fd = path_open_safe(path);
903 if (fd < 0)
904 return fd;
905
906 return fd_set_perms(i, fd, path, NULL);
907 }
908
909 static int parse_xattrs_from_arg(Item *i) {
910 const char *p;
911 int r;
912
913 assert(i);
914 assert(i->argument);
915
916 p = i->argument;
917
918 for (;;) {
919 _cleanup_free_ char *name = NULL, *value = NULL, *xattr = NULL;
920
921 r = extract_first_word(&p, &xattr, NULL, EXTRACT_QUOTES|EXTRACT_CUNESCAPE);
922 if (r < 0)
923 log_warning_errno(r, "Failed to parse extended attribute '%s', ignoring: %m", p);
924 if (r <= 0)
925 break;
926
927 r = split_pair(xattr, "=", &name, &value);
928 if (r < 0) {
929 log_warning_errno(r, "Failed to parse extended attribute, ignoring: %s", xattr);
930 continue;
931 }
932
933 if (isempty(name) || isempty(value)) {
934 log_warning("Malformed extended attribute found, ignoring: %s", xattr);
935 continue;
936 }
937
938 if (strv_push_pair(&i->xattrs, name, value) < 0)
939 return log_oom();
940
941 name = value = NULL;
942 }
943
944 return 0;
945 }
946
947 static int fd_set_xattrs(Item *i, int fd, const char *path, const struct stat *st) {
948 char procfs_path[STRLEN("/proc/self/fd/") + DECIMAL_STR_MAX(int)];
949 char **name, **value;
950
951 assert(i);
952 assert(fd);
953 assert(path);
954
955 xsprintf(procfs_path, "/proc/self/fd/%i", fd);
956
957 STRV_FOREACH_PAIR(name, value, i->xattrs) {
958 log_debug("Setting extended attribute '%s=%s' on %s.", *name, *value, path);
959 if (setxattr(procfs_path, *name, *value, strlen(*value), 0) < 0)
960 return log_error_errno(errno, "Setting extended attribute %s=%s on %s failed: %m",
961 *name, *value, path);
962 }
963 return 0;
964 }
965
966 static int path_set_xattrs(Item *i, const char *path) {
967 _cleanup_close_ int fd = -1;
968
969 assert(i);
970 assert(path);
971
972 fd = path_open_safe(path);
973 if (fd < 0)
974 return fd;
975
976 return fd_set_xattrs(i, fd, path, NULL);
977 }
978
979 static int parse_acls_from_arg(Item *item) {
980 #if HAVE_ACL
981 int r;
982
983 assert(item);
984
985 /* If force (= modify) is set, we will not modify the acl
986 * afterwards, so the mask can be added now if necessary. */
987
988 r = parse_acl(item->argument, &item->acl_access, &item->acl_default, !item->force);
989 if (r < 0)
990 log_warning_errno(r, "Failed to parse ACL \"%s\": %m. Ignoring", item->argument);
991 #else
992 log_warning_errno(ENOSYS, "ACLs are not supported. Ignoring");
993 #endif
994
995 return 0;
996 }
997
998 #if HAVE_ACL
999 static int path_set_acl(const char *path, const char *pretty, acl_type_t type, acl_t acl, bool modify) {
1000 _cleanup_(acl_free_charpp) char *t = NULL;
1001 _cleanup_(acl_freep) acl_t dup = NULL;
1002 int r;
1003
1004 /* Returns 0 for success, positive error if already warned,
1005 * negative error otherwise. */
1006
1007 if (modify) {
1008 r = acls_for_file(path, type, acl, &dup);
1009 if (r < 0)
1010 return r;
1011
1012 r = calc_acl_mask_if_needed(&dup);
1013 if (r < 0)
1014 return r;
1015 } else {
1016 dup = acl_dup(acl);
1017 if (!dup)
1018 return -errno;
1019
1020 /* the mask was already added earlier if needed */
1021 }
1022
1023 r = add_base_acls_if_needed(&dup, path);
1024 if (r < 0)
1025 return r;
1026
1027 t = acl_to_any_text(dup, NULL, ',', TEXT_ABBREVIATE);
1028 log_debug("Setting %s ACL %s on %s.",
1029 type == ACL_TYPE_ACCESS ? "access" : "default",
1030 strna(t), pretty);
1031
1032 r = acl_set_file(path, type, dup);
1033 if (r < 0)
1034 /* Return positive to indicate we already warned */
1035 return -log_error_errno(errno,
1036 "Setting %s ACL \"%s\" on %s failed: %m",
1037 type == ACL_TYPE_ACCESS ? "access" : "default",
1038 strna(t), pretty);
1039
1040 return 0;
1041 }
1042 #endif
1043
1044 static int fd_set_acls(Item *item, int fd, const char *path, const struct stat *st) {
1045 int r = 0;
1046 #if HAVE_ACL
1047 char procfs_path[STRLEN("/proc/self/fd/") + DECIMAL_STR_MAX(int)];
1048 struct stat stbuf;
1049
1050 assert(item);
1051 assert(fd);
1052 assert(path);
1053
1054 if (!st) {
1055 if (fstat(fd, &stbuf) < 0)
1056 return log_error_errno(errno, "fstat(%s) failed: %m", path);
1057 st = &stbuf;
1058 }
1059
1060 if (hardlink_vulnerable(st))
1061 return log_error_errno(SYNTHETIC_ERRNO(EPERM),
1062 "Refusing to set ACLs on hardlinked file %s while the fs.protected_hardlinks sysctl is turned off.",
1063 path);
1064
1065 if (S_ISLNK(st->st_mode)) {
1066 log_debug("Skipping ACL fix for symlink %s.", path);
1067 return 0;
1068 }
1069
1070 xsprintf(procfs_path, "/proc/self/fd/%i", fd);
1071
1072 if (item->acl_access)
1073 r = path_set_acl(procfs_path, path, ACL_TYPE_ACCESS, item->acl_access, item->force);
1074
1075 /* set only default acls to folders */
1076 if (r == 0 && item->acl_default && S_ISDIR(st->st_mode))
1077 r = path_set_acl(procfs_path, path, ACL_TYPE_DEFAULT, item->acl_default, item->force);
1078
1079 if (r > 0)
1080 return -r; /* already warned */
1081 if (r == -EOPNOTSUPP) {
1082 log_debug_errno(r, "ACLs not supported by file system at %s", path);
1083 return 0;
1084 }
1085 if (r < 0)
1086 return log_error_errno(r, "ACL operation on \"%s\" failed: %m", path);
1087 #endif
1088 return r;
1089 }
1090
1091 static int path_set_acls(Item *item, const char *path) {
1092 int r = 0;
1093 #if HAVE_ACL
1094 _cleanup_close_ int fd = -1;
1095
1096 assert(item);
1097 assert(path);
1098
1099 fd = path_open_safe(path);
1100 if (fd < 0)
1101 return fd;
1102
1103 r = fd_set_acls(item, fd, path, NULL);
1104 #endif
1105 return r;
1106 }
1107
1108 #define ATTRIBUTES_ALL \
1109 (FS_NOATIME_FL | \
1110 FS_SYNC_FL | \
1111 FS_DIRSYNC_FL | \
1112 FS_APPEND_FL | \
1113 FS_COMPR_FL | \
1114 FS_NODUMP_FL | \
1115 FS_EXTENT_FL | \
1116 FS_IMMUTABLE_FL | \
1117 FS_JOURNAL_DATA_FL | \
1118 FS_SECRM_FL | \
1119 FS_UNRM_FL | \
1120 FS_NOTAIL_FL | \
1121 FS_TOPDIR_FL | \
1122 FS_NOCOW_FL)
1123
1124 static int parse_attribute_from_arg(Item *item) {
1125
1126 static const struct {
1127 char character;
1128 unsigned value;
1129 } attributes[] = {
1130 { 'A', FS_NOATIME_FL }, /* do not update atime */
1131 { 'S', FS_SYNC_FL }, /* Synchronous updates */
1132 { 'D', FS_DIRSYNC_FL }, /* dirsync behaviour (directories only) */
1133 { 'a', FS_APPEND_FL }, /* writes to file may only append */
1134 { 'c', FS_COMPR_FL }, /* Compress file */
1135 { 'd', FS_NODUMP_FL }, /* do not dump file */
1136 { 'e', FS_EXTENT_FL }, /* Extents */
1137 { 'i', FS_IMMUTABLE_FL }, /* Immutable file */
1138 { 'j', FS_JOURNAL_DATA_FL }, /* Reserved for ext3 */
1139 { 's', FS_SECRM_FL }, /* Secure deletion */
1140 { 'u', FS_UNRM_FL }, /* Undelete */
1141 { 't', FS_NOTAIL_FL }, /* file tail should not be merged */
1142 { 'T', FS_TOPDIR_FL }, /* Top of directory hierarchies */
1143 { 'C', FS_NOCOW_FL }, /* Do not cow file */
1144 };
1145
1146 enum {
1147 MODE_ADD,
1148 MODE_DEL,
1149 MODE_SET
1150 } mode = MODE_ADD;
1151
1152 unsigned value = 0, mask = 0;
1153 const char *p;
1154
1155 assert(item);
1156
1157 p = item->argument;
1158 if (p) {
1159 if (*p == '+') {
1160 mode = MODE_ADD;
1161 p++;
1162 } else if (*p == '-') {
1163 mode = MODE_DEL;
1164 p++;
1165 } else if (*p == '=') {
1166 mode = MODE_SET;
1167 p++;
1168 }
1169 }
1170
1171 if (isempty(p) && mode != MODE_SET)
1172 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
1173 "Setting file attribute on '%s' needs an attribute specification.",
1174 item->path);
1175
1176 for (; p && *p ; p++) {
1177 unsigned i, v;
1178
1179 for (i = 0; i < ELEMENTSOF(attributes); i++)
1180 if (*p == attributes[i].character)
1181 break;
1182
1183 if (i >= ELEMENTSOF(attributes))
1184 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
1185 "Unknown file attribute '%c' on '%s'.",
1186 *p, item->path);
1187
1188 v = attributes[i].value;
1189
1190 SET_FLAG(value, v, IN_SET(mode, MODE_ADD, MODE_SET));
1191
1192 mask |= v;
1193 }
1194
1195 if (mode == MODE_SET)
1196 mask |= ATTRIBUTES_ALL;
1197
1198 assert(mask != 0);
1199
1200 item->attribute_mask = mask;
1201 item->attribute_value = value;
1202 item->attribute_set = true;
1203
1204 return 0;
1205 }
1206
1207 static int fd_set_attribute(Item *item, int fd, const char *path, const struct stat *st) {
1208 _cleanup_close_ int procfs_fd = -1;
1209 struct stat stbuf;
1210 unsigned f;
1211 int r;
1212
1213 assert(item);
1214 assert(fd);
1215 assert(path);
1216
1217 if (!item->attribute_set || item->attribute_mask == 0)
1218 return 0;
1219
1220 if (!st) {
1221 if (fstat(fd, &stbuf) < 0)
1222 return log_error_errno(errno, "fstat(%s) failed: %m", path);
1223 st = &stbuf;
1224 }
1225
1226 /* Issuing the file attribute ioctls on device nodes is not
1227 * safe, as that will be delivered to the drivers, not the
1228 * file system containing the device node. */
1229 if (!S_ISREG(st->st_mode) && !S_ISDIR(st->st_mode))
1230 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
1231 "Setting file flags is only supported on regular files and directories, cannot set on '%s'.",
1232 path);
1233
1234 f = item->attribute_value & item->attribute_mask;
1235
1236 /* Mask away directory-specific flags */
1237 if (!S_ISDIR(st->st_mode))
1238 f &= ~FS_DIRSYNC_FL;
1239
1240 procfs_fd = fd_reopen(fd, O_RDONLY|O_CLOEXEC|O_NOATIME);
1241 if (procfs_fd < 0)
1242 return log_error_errno(procfs_fd, "Failed to re-open '%s': %m", path);
1243
1244 r = chattr_fd(procfs_fd, f, item->attribute_mask, NULL);
1245 if (r < 0)
1246 log_full_errno(IN_SET(r, -ENOTTY, -EOPNOTSUPP) ? LOG_DEBUG : LOG_WARNING,
1247 r,
1248 "Cannot set file attribute for '%s', value=0x%08x, mask=0x%08x, ignoring: %m",
1249 path, item->attribute_value, item->attribute_mask);
1250
1251 return 0;
1252 }
1253
1254 static int path_set_attribute(Item *item, const char *path) {
1255 _cleanup_close_ int fd = -1;
1256
1257 if (!item->attribute_set || item->attribute_mask == 0)
1258 return 0;
1259
1260 fd = path_open_safe(path);
1261 if (fd < 0)
1262 return fd;
1263
1264 return fd_set_attribute(item, fd, path, NULL);
1265 }
1266
1267 static int write_one_file(Item *i, const char *path) {
1268 _cleanup_close_ int fd = -1, dir_fd = -1;
1269 char *bn;
1270 int r;
1271
1272 assert(i);
1273 assert(path);
1274 assert(i->argument);
1275 assert(i->type == WRITE_FILE);
1276
1277 /* Validate the path and keep the fd on the directory for opening the
1278 * file so we're sure that it can't be changed behind our back. */
1279 dir_fd = path_open_parent_safe(path);
1280 if (dir_fd < 0)
1281 return dir_fd;
1282
1283 bn = basename(path);
1284
1285 /* Follows symlinks */
1286 fd = openat(dir_fd, bn, O_NONBLOCK|O_CLOEXEC|O_WRONLY|O_NOCTTY, i->mode);
1287 if (fd < 0) {
1288 if (errno == ENOENT) {
1289 log_debug_errno(errno, "Not writing missing file \"%s\": %m", path);
1290 return 0;
1291 }
1292 return log_error_errno(errno, "Failed to open file \"%s\": %m", path);
1293 }
1294
1295 /* 'w' is allowed to write into any kind of files. */
1296 log_debug("Writing to \"%s\".", path);
1297
1298 r = loop_write(fd, i->argument, strlen(i->argument), false);
1299 if (r < 0)
1300 return log_error_errno(r, "Failed to write file \"%s\": %m", path);
1301
1302 return fd_set_perms(i, fd, path, NULL);
1303 }
1304
1305 static int create_file(Item *i, const char *path) {
1306 _cleanup_close_ int fd = -1, dir_fd = -1;
1307 struct stat stbuf, *st = NULL;
1308 int r = 0;
1309 char *bn;
1310
1311 assert(i);
1312 assert(path);
1313 assert(i->type == CREATE_FILE);
1314
1315 /* 'f' operates on regular files exclusively. */
1316
1317 /* Validate the path and keep the fd on the directory for opening the
1318 * file so we're sure that it can't be changed behind our back. */
1319 dir_fd = path_open_parent_safe(path);
1320 if (dir_fd < 0)
1321 return dir_fd;
1322
1323 bn = basename(path);
1324
1325 RUN_WITH_UMASK(0000) {
1326 mac_selinux_create_file_prepare(path, S_IFREG);
1327 fd = openat(dir_fd, bn, O_CREAT|O_EXCL|O_NOFOLLOW|O_NONBLOCK|O_CLOEXEC|O_WRONLY|O_NOCTTY, i->mode);
1328 mac_selinux_create_file_clear();
1329 }
1330
1331 if (fd < 0) {
1332 /* Even on a read-only filesystem, open(2) returns EEXIST if the
1333 * file already exists. It returns EROFS only if it needs to
1334 * create the file. */
1335 if (errno != EEXIST)
1336 return log_error_errno(errno, "Failed to create file %s: %m", path);
1337
1338 /* Re-open the file. At that point it must exist since open(2)
1339 * failed with EEXIST. We still need to check if the perms/mode
1340 * need to be changed. For read-only filesystems, we let
1341 * fd_set_perms() report the error if the perms need to be
1342 * modified. */
1343 fd = openat(dir_fd, bn, O_NOFOLLOW|O_CLOEXEC|O_PATH, i->mode);
1344 if (fd < 0)
1345 return log_error_errno(errno, "Failed to re-open file %s: %m", path);
1346
1347 if (fstat(fd, &stbuf) < 0)
1348 return log_error_errno(errno, "stat(%s) failed: %m", path);
1349
1350 if (!S_ISREG(stbuf.st_mode)) {
1351 log_error("%s exists and is not a regular file.", path);
1352 return -EEXIST;
1353 }
1354
1355 st = &stbuf;
1356 } else {
1357
1358 log_debug("\"%s\" has been created.", path);
1359
1360 if (i->argument) {
1361 log_debug("Writing to \"%s\".", path);
1362
1363 r = loop_write(fd, i->argument, strlen(i->argument), false);
1364 if (r < 0)
1365 return log_error_errno(r, "Failed to write file \"%s\": %m", path);
1366 }
1367 }
1368
1369 return fd_set_perms(i, fd, path, st);
1370 }
1371
1372 static int truncate_file(Item *i, const char *path) {
1373 _cleanup_close_ int fd = -1, dir_fd = -1;
1374 struct stat stbuf, *st = NULL;
1375 bool erofs = false;
1376 int r = 0;
1377 char *bn;
1378
1379 assert(i);
1380 assert(path);
1381 assert(i->type == TRUNCATE_FILE);
1382
1383 /* We want to operate on regular file exclusively especially since
1384 * O_TRUNC is unspecified if the file is neither a regular file nor a
1385 * fifo nor a terminal device. Therefore we first open the file and make
1386 * sure it's a regular one before truncating it. */
1387
1388 /* Validate the path and keep the fd on the directory for opening the
1389 * file so we're sure that it can't be changed behind our back. */
1390 dir_fd = path_open_parent_safe(path);
1391 if (dir_fd < 0)
1392 return dir_fd;
1393
1394 bn = basename(path);
1395
1396 RUN_WITH_UMASK(0000) {
1397 mac_selinux_create_file_prepare(path, S_IFREG);
1398 fd = openat(dir_fd, bn, O_CREAT|O_NOFOLLOW|O_NONBLOCK|O_CLOEXEC|O_WRONLY|O_NOCTTY, i->mode);
1399 mac_selinux_create_file_clear();
1400 }
1401
1402 if (fd < 0) {
1403 if (errno != EROFS)
1404 return log_error_errno(errno, "Failed to open/create file %s: %m", path);
1405
1406 /* On a read-only filesystem, we don't want to fail if the
1407 * target is already empty and the perms are set. So we still
1408 * proceed with the sanity checks and let the remaining
1409 * operations fail with EROFS if they try to modify the target
1410 * file. */
1411
1412 fd = openat(dir_fd, bn, O_NOFOLLOW|O_CLOEXEC|O_PATH, i->mode);
1413 if (fd < 0) {
1414 if (errno == ENOENT) {
1415 log_error("Cannot create file %s on a read-only file system.", path);
1416 return -EROFS;
1417 }
1418
1419 return log_error_errno(errno, "Failed to re-open file %s: %m", path);
1420 }
1421
1422 erofs = true;
1423 }
1424
1425 if (fstat(fd, &stbuf) < 0)
1426 return log_error_errno(errno, "stat(%s) failed: %m", path);
1427
1428 if (!S_ISREG(stbuf.st_mode)) {
1429 log_error("%s exists and is not a regular file.", path);
1430 return -EEXIST;
1431 }
1432
1433 if (stbuf.st_size > 0) {
1434 if (ftruncate(fd, 0) < 0) {
1435 r = erofs ? -EROFS : -errno;
1436 return log_error_errno(r, "Failed to truncate file %s: %m", path);
1437 }
1438 } else
1439 st = &stbuf;
1440
1441 log_debug("\"%s\" has been created.", path);
1442
1443 if (i->argument) {
1444 log_debug("Writing to \"%s\".", path);
1445
1446 r = loop_write(fd, i->argument, strlen(i->argument), false);
1447 if (r < 0) {
1448 r = erofs ? -EROFS : r;
1449 return log_error_errno(r, "Failed to write file %s: %m", path);
1450 }
1451 }
1452
1453 return fd_set_perms(i, fd, path, st);
1454 }
1455
1456 static int copy_files(Item *i) {
1457 _cleanup_close_ int dfd = -1, fd = -1;
1458 char *bn;
1459 int r;
1460
1461 log_debug("Copying tree \"%s\" to \"%s\".", i->argument, i->path);
1462
1463 bn = basename(i->path);
1464
1465 /* Validate the path and use the returned directory fd for copying the
1466 * target so we're sure that the path can't be changed behind our
1467 * back. */
1468 dfd = path_open_parent_safe(i->path);
1469 if (dfd < 0)
1470 return dfd;
1471
1472 r = copy_tree_at(AT_FDCWD, i->argument,
1473 dfd, bn,
1474 i->uid_set ? i->uid : UID_INVALID,
1475 i->gid_set ? i->gid : GID_INVALID,
1476 COPY_REFLINK);
1477 if (r < 0) {
1478 struct stat a, b;
1479
1480 /* If the target already exists on read-only filesystems, trying
1481 * to create the target will not fail with EEXIST but with
1482 * EROFS. */
1483 if (r == -EROFS && faccessat(dfd, bn, F_OK, AT_SYMLINK_NOFOLLOW) == 0)
1484 r = -EEXIST;
1485
1486 if (r != -EEXIST)
1487 return log_error_errno(r, "Failed to copy files to %s: %m", i->path);
1488
1489 if (stat(i->argument, &a) < 0)
1490 return log_error_errno(errno, "stat(%s) failed: %m", i->argument);
1491
1492 if (fstatat(dfd, bn, &b, AT_SYMLINK_NOFOLLOW) < 0)
1493 return log_error_errno(errno, "stat(%s) failed: %m", i->path);
1494
1495 if ((a.st_mode ^ b.st_mode) & S_IFMT) {
1496 log_debug("Can't copy to %s, file exists already and is of different type", i->path);
1497 return 0;
1498 }
1499 }
1500
1501 fd = openat(dfd, bn, O_NOFOLLOW|O_CLOEXEC|O_PATH);
1502 if (fd < 0)
1503 return log_error_errno(errno, "Failed to openat(%s): %m", i->path);
1504
1505 return fd_set_perms(i, fd, i->path, NULL);
1506 }
1507
1508 typedef enum {
1509 CREATION_NORMAL,
1510 CREATION_EXISTING,
1511 CREATION_FORCE,
1512 _CREATION_MODE_MAX,
1513 _CREATION_MODE_INVALID = -1
1514 } CreationMode;
1515
1516 static const char *creation_mode_verb_table[_CREATION_MODE_MAX] = {
1517 [CREATION_NORMAL] = "Created",
1518 [CREATION_EXISTING] = "Found existing",
1519 [CREATION_FORCE] = "Created replacement",
1520 };
1521
1522 DEFINE_PRIVATE_STRING_TABLE_LOOKUP_TO_STRING(creation_mode_verb, CreationMode);
1523
1524 static int create_directory_or_subvolume(const char *path, mode_t mode, bool subvol, CreationMode *creation) {
1525 _cleanup_close_ int pfd = -1;
1526 CreationMode c;
1527 int r;
1528
1529 assert(path);
1530
1531 if (!creation)
1532 creation = &c;
1533
1534 pfd = path_open_parent_safe(path);
1535 if (pfd < 0)
1536 return pfd;
1537
1538 if (subvol) {
1539 if (btrfs_is_subvol(empty_to_root(arg_root)) <= 0)
1540
1541 /* Don't create a subvolume unless the root directory is
1542 * one, too. We do this under the assumption that if the
1543 * root directory is just a plain directory (i.e. very
1544 * light-weight), we shouldn't try to split it up into
1545 * subvolumes (i.e. more heavy-weight). Thus, chroot()
1546 * environments and suchlike will get a full brtfs
1547 * subvolume set up below their tree only if they
1548 * specifically set up a btrfs subvolume for the root
1549 * dir too. */
1550
1551 subvol = false;
1552 else {
1553 RUN_WITH_UMASK((~mode) & 0777)
1554 r = btrfs_subvol_make_fd(pfd, basename(path));
1555 }
1556 } else
1557 r = 0;
1558
1559 if (!subvol || r == -ENOTTY)
1560 RUN_WITH_UMASK(0000)
1561 r = mkdirat_label(pfd, basename(path), mode);
1562
1563 if (r < 0) {
1564 int k;
1565
1566 if (!IN_SET(r, -EEXIST, -EROFS))
1567 return log_error_errno(r, "Failed to create directory or subvolume \"%s\": %m", path);
1568
1569 k = is_dir_fd(pfd);
1570 if (k == -ENOENT && r == -EROFS)
1571 return log_error_errno(r, "%s does not exist and cannot be created as the file system is read-only.", path);
1572 if (k < 0)
1573 return log_error_errno(k, "Failed to check if %s exists: %m", path);
1574 if (!k) {
1575 log_warning("\"%s\" already exists and is not a directory.", path);
1576 return -EEXIST;
1577 }
1578
1579 *creation = CREATION_EXISTING;
1580 } else
1581 *creation = CREATION_NORMAL;
1582
1583 log_debug("%s directory \"%s\".", creation_mode_verb_to_string(*creation), path);
1584
1585 r = openat(pfd, basename(path), O_NOCTTY|O_CLOEXEC|O_DIRECTORY);
1586 if (r < 0)
1587 return log_error_errno(errno, "Failed to open directory '%s': %m", basename(path));
1588
1589 return r;
1590 }
1591
1592 static int create_directory(Item *i, const char *path) {
1593 _cleanup_close_ int fd = -1;
1594
1595 assert(i);
1596 assert(IN_SET(i->type, CREATE_DIRECTORY, TRUNCATE_DIRECTORY));
1597
1598 fd = create_directory_or_subvolume(path, i->mode, false, NULL);
1599 if (fd == -EEXIST)
1600 return 0;
1601 if (fd < 0)
1602 return fd;
1603
1604 return fd_set_perms(i, fd, path, NULL);
1605 }
1606
1607 static int create_subvolume(Item *i, const char *path) {
1608 _cleanup_close_ int fd = -1;
1609 CreationMode creation;
1610 int r, q = 0;
1611
1612 assert(i);
1613 assert(IN_SET(i->type, CREATE_SUBVOLUME, CREATE_SUBVOLUME_NEW_QUOTA, CREATE_SUBVOLUME_INHERIT_QUOTA));
1614
1615 fd = create_directory_or_subvolume(path, i->mode, true, &creation);
1616 if (fd == -EEXIST)
1617 return 0;
1618 if (fd < 0)
1619 return fd;
1620
1621 if (creation == CREATION_NORMAL &&
1622 IN_SET(i->type, CREATE_SUBVOLUME_NEW_QUOTA, CREATE_SUBVOLUME_INHERIT_QUOTA)) {
1623 r = btrfs_subvol_auto_qgroup_fd(fd, 0, i->type == CREATE_SUBVOLUME_NEW_QUOTA);
1624 if (r == -ENOTTY)
1625 log_debug_errno(r, "Couldn't adjust quota for subvolume \"%s\" (unsupported fs or dir not a subvolume): %m", i->path);
1626 else if (r == -EROFS)
1627 log_debug_errno(r, "Couldn't adjust quota for subvolume \"%s\" (fs is read-only).", i->path);
1628 else if (r == -ENOPROTOOPT)
1629 log_debug_errno(r, "Couldn't adjust quota for subvolume \"%s\" (quota support is disabled).", i->path);
1630 else if (r < 0)
1631 q = log_error_errno(r, "Failed to adjust quota for subvolume \"%s\": %m", i->path);
1632 else if (r > 0)
1633 log_debug("Adjusted quota for subvolume \"%s\".", i->path);
1634 else if (r == 0)
1635 log_debug("Quota for subvolume \"%s\" already in place, no change made.", i->path);
1636 }
1637
1638 r = fd_set_perms(i, fd, path, NULL);
1639 if (q < 0) /* prefer the quota change error from above */
1640 return q;
1641
1642 return r;
1643 }
1644
1645 static int empty_directory(Item *i, const char *path) {
1646 int r;
1647
1648 assert(i);
1649 assert(i->type == EMPTY_DIRECTORY);
1650
1651 r = is_dir(path, false);
1652 if (r == -ENOENT) {
1653 /* Option "e" operates only on existing objects. Do not
1654 * print errors about non-existent files or directories */
1655 log_debug("Skipping missing directory: %s", path);
1656 return 0;
1657 }
1658 if (r < 0)
1659 return log_error_errno(r, "is_dir() failed on path %s: %m", path);
1660 if (r == 0)
1661 return log_error_errno(SYNTHETIC_ERRNO(EEXIST),
1662 "'%s' already exists and is not a directory.",
1663 path);
1664
1665 return path_set_perms(i, path);
1666 }
1667
1668 static int create_device(Item *i, mode_t file_type) {
1669 _cleanup_close_ int dfd = -1, fd = -1;
1670 CreationMode creation;
1671 char *bn;
1672 int r;
1673
1674 assert(i);
1675 assert(IN_SET(file_type, S_IFBLK, S_IFCHR));
1676
1677 bn = basename(i->path);
1678
1679 /* Validate the path and use the returned directory fd for copying the
1680 * target so we're sure that the path can't be changed behind our
1681 * back. */
1682 dfd = path_open_parent_safe(i->path);
1683 if (dfd < 0)
1684 return dfd;
1685
1686 RUN_WITH_UMASK(0000) {
1687 mac_selinux_create_file_prepare(i->path, file_type);
1688 r = mknodat(dfd, bn, i->mode | file_type, i->major_minor);
1689 mac_selinux_create_file_clear();
1690 }
1691
1692 if (r < 0) {
1693 struct stat st;
1694
1695 if (errno == EPERM) {
1696 log_debug("We lack permissions, possibly because of cgroup configuration; "
1697 "skipping creation of device node %s.", i->path);
1698 return 0;
1699 }
1700
1701 if (errno != EEXIST)
1702 return log_error_errno(errno, "Failed to create device node %s: %m", i->path);
1703
1704 if (fstatat(dfd, bn, &st, 0) < 0)
1705 return log_error_errno(errno, "stat(%s) failed: %m", i->path);
1706
1707 if ((st.st_mode & S_IFMT) != file_type) {
1708
1709 if (i->force) {
1710
1711 RUN_WITH_UMASK(0000) {
1712 mac_selinux_create_file_prepare(i->path, file_type);
1713 /* FIXME: need to introduce mknodat_atomic() */
1714 r = mknod_atomic(i->path, i->mode | file_type, i->major_minor);
1715 mac_selinux_create_file_clear();
1716 }
1717
1718 if (r < 0)
1719 return log_error_errno(r, "Failed to create device node \"%s\": %m", i->path);
1720 creation = CREATION_FORCE;
1721 } else {
1722 log_debug("%s is not a device node.", i->path);
1723 return 0;
1724 }
1725 } else
1726 creation = CREATION_EXISTING;
1727 } else
1728 creation = CREATION_NORMAL;
1729
1730 log_debug("%s %s device node \"%s\" %u:%u.",
1731 creation_mode_verb_to_string(creation),
1732 i->type == CREATE_BLOCK_DEVICE ? "block" : "char",
1733 i->path, major(i->mode), minor(i->mode));
1734
1735 fd = openat(dfd, bn, O_NOFOLLOW|O_CLOEXEC|O_PATH);
1736 if (fd < 0)
1737 return log_error_errno(errno, "Failed to openat(%s): %m", i->path);
1738
1739 return fd_set_perms(i, fd, i->path, NULL);
1740 }
1741
1742 static int create_fifo(Item *i, const char *path) {
1743 _cleanup_close_ int pfd = -1, fd = -1;
1744 CreationMode creation;
1745 struct stat st;
1746 char *bn;
1747 int r;
1748
1749 pfd = path_open_parent_safe(path);
1750 if (pfd < 0)
1751 return pfd;
1752
1753 bn = basename(path);
1754
1755 RUN_WITH_UMASK(0000) {
1756 mac_selinux_create_file_prepare(path, S_IFIFO);
1757 r = mkfifoat(pfd, bn, i->mode);
1758 mac_selinux_create_file_clear();
1759 }
1760
1761 if (r < 0) {
1762 if (errno != EEXIST)
1763 return log_error_errno(errno, "Failed to create fifo %s: %m", path);
1764
1765 if (fstatat(pfd, bn, &st, AT_SYMLINK_NOFOLLOW) < 0)
1766 return log_error_errno(errno, "stat(%s) failed: %m", path);
1767
1768 if (!S_ISFIFO(st.st_mode)) {
1769
1770 if (i->force) {
1771 RUN_WITH_UMASK(0000) {
1772 mac_selinux_create_file_prepare(path, S_IFIFO);
1773 r = mkfifoat_atomic(pfd, bn, i->mode);
1774 mac_selinux_create_file_clear();
1775 }
1776
1777 if (r < 0)
1778 return log_error_errno(r, "Failed to create fifo %s: %m", path);
1779 creation = CREATION_FORCE;
1780 } else {
1781 log_warning("\"%s\" already exists and is not a fifo.", path);
1782 return 0;
1783 }
1784 } else
1785 creation = CREATION_EXISTING;
1786 } else
1787 creation = CREATION_NORMAL;
1788
1789 log_debug("%s fifo \"%s\".", creation_mode_verb_to_string(creation), path);
1790
1791 fd = openat(pfd, bn, O_NOFOLLOW|O_CLOEXEC|O_PATH);
1792 if (fd < 0)
1793 return log_error_errno(errno, "Failed to openat(%s): %m", path);
1794
1795 return fd_set_perms(i, fd, i->path, NULL);
1796 }
1797
1798 typedef int (*action_t)(Item *i, const char *path);
1799 typedef int (*fdaction_t)(Item *i, int fd, const char *path, const struct stat *st);
1800
1801 static int item_do(Item *i, int fd, const char *path, fdaction_t action) {
1802 struct stat st;
1803 int r = 0, q;
1804
1805 assert(i);
1806 assert(path);
1807 assert(fd >= 0);
1808
1809 if (fstat(fd, &st) < 0) {
1810 r = log_error_errno(errno, "fstat() on file failed: %m");
1811 goto finish;
1812 }
1813
1814 /* This returns the first error we run into, but nevertheless
1815 * tries to go on */
1816 r = action(i, fd, path, &st);
1817
1818 if (S_ISDIR(st.st_mode)) {
1819 char procfs_path[STRLEN("/proc/self/fd/") + DECIMAL_STR_MAX(int)];
1820 _cleanup_closedir_ DIR *d = NULL;
1821 struct dirent *de;
1822
1823 /* The passed 'fd' was opened with O_PATH. We need to convert
1824 * it into a 'regular' fd before reading the directory content. */
1825 xsprintf(procfs_path, "/proc/self/fd/%i", fd);
1826
1827 d = opendir(procfs_path);
1828 if (!d) {
1829 log_error_errno(errno, "Failed to opendir() '%s': %m", procfs_path);
1830 if (r == 0)
1831 r = -errno;
1832 goto finish;
1833 }
1834
1835 FOREACH_DIRENT_ALL(de, d, q = -errno; goto finish) {
1836 int de_fd;
1837
1838 if (dot_or_dot_dot(de->d_name))
1839 continue;
1840
1841 de_fd = openat(fd, de->d_name, O_NOFOLLOW|O_CLOEXEC|O_PATH);
1842 if (de_fd < 0)
1843 q = log_error_errno(errno, "Failed to open() file '%s': %m", de->d_name);
1844 else {
1845 _cleanup_free_ char *de_path = NULL;
1846
1847 de_path = path_join(NULL, path, de->d_name);
1848 if (!de_path)
1849 q = log_oom();
1850 else
1851 /* Pass ownership of dirent fd over */
1852 q = item_do(i, de_fd, de_path, action);
1853 }
1854
1855 if (q < 0 && r == 0)
1856 r = q;
1857 }
1858 }
1859 finish:
1860 safe_close(fd);
1861 return r;
1862 }
1863
1864 static int glob_item(Item *i, action_t action) {
1865 _cleanup_globfree_ glob_t g = {
1866 .gl_opendir = (void *(*)(const char *)) opendir_nomod,
1867 };
1868 int r = 0, k;
1869 char **fn;
1870
1871 k = safe_glob(i->path, GLOB_NOSORT|GLOB_BRACE, &g);
1872 if (k < 0 && k != -ENOENT)
1873 return log_error_errno(k, "glob(%s) failed: %m", i->path);
1874
1875 STRV_FOREACH(fn, g.gl_pathv) {
1876 k = action(i, *fn);
1877 if (k < 0 && r == 0)
1878 r = k;
1879 }
1880
1881 return r;
1882 }
1883
1884 static int glob_item_recursively(Item *i, fdaction_t action) {
1885 _cleanup_globfree_ glob_t g = {
1886 .gl_opendir = (void *(*)(const char *)) opendir_nomod,
1887 };
1888 int r = 0, k;
1889 char **fn;
1890
1891 k = safe_glob(i->path, GLOB_NOSORT|GLOB_BRACE, &g);
1892 if (k < 0 && k != -ENOENT)
1893 return log_error_errno(k, "glob(%s) failed: %m", i->path);
1894
1895 STRV_FOREACH(fn, g.gl_pathv) {
1896 _cleanup_close_ int fd = -1;
1897
1898 /* Make sure we won't trigger/follow file object (such as
1899 * device nodes, automounts, ...) pointed out by 'fn' with
1900 * O_PATH. Note, when O_PATH is used, flags other than
1901 * O_CLOEXEC, O_DIRECTORY, and O_NOFOLLOW are ignored. */
1902
1903 fd = open(*fn, O_CLOEXEC|O_NOFOLLOW|O_PATH);
1904 if (fd < 0) {
1905 log_error_errno(errno, "Opening '%s' failed: %m", *fn);
1906 if (r == 0)
1907 r = -errno;
1908 continue;
1909 }
1910
1911 k = item_do(i, fd, *fn, action);
1912 if (k < 0 && r == 0)
1913 r = k;
1914
1915 /* we passed fd ownership to the previous call */
1916 fd = -1;
1917 }
1918
1919 return r;
1920 }
1921
1922 static int create_item(Item *i) {
1923 CreationMode creation;
1924 int r = 0;
1925
1926 assert(i);
1927
1928 log_debug("Running create action for entry %c %s", (char) i->type, i->path);
1929
1930 switch (i->type) {
1931
1932 case IGNORE_PATH:
1933 case IGNORE_DIRECTORY_PATH:
1934 case REMOVE_PATH:
1935 case RECURSIVE_REMOVE_PATH:
1936 return 0;
1937
1938 case CREATE_FILE:
1939 RUN_WITH_UMASK(0000)
1940 (void) mkdir_parents_label(i->path, 0755);
1941
1942 r = create_file(i, i->path);
1943 if (r < 0)
1944 return r;
1945 break;
1946
1947 case TRUNCATE_FILE:
1948 RUN_WITH_UMASK(0000)
1949 (void) mkdir_parents_label(i->path, 0755);
1950
1951 r = truncate_file(i, i->path);
1952 if (r < 0)
1953 return r;
1954 break;
1955
1956 case COPY_FILES:
1957 RUN_WITH_UMASK(0000)
1958 (void) mkdir_parents_label(i->path, 0755);
1959
1960 r = copy_files(i);
1961 if (r < 0)
1962 return r;
1963 break;
1964
1965 case WRITE_FILE:
1966 r = glob_item(i, write_one_file);
1967 if (r < 0)
1968 return r;
1969
1970 break;
1971
1972 case CREATE_DIRECTORY:
1973 case TRUNCATE_DIRECTORY:
1974 RUN_WITH_UMASK(0000)
1975 (void) mkdir_parents_label(i->path, 0755);
1976
1977 r = create_directory(i, i->path);
1978 if (r < 0)
1979 return r;
1980 break;
1981
1982 case CREATE_SUBVOLUME:
1983 case CREATE_SUBVOLUME_INHERIT_QUOTA:
1984 case CREATE_SUBVOLUME_NEW_QUOTA:
1985 RUN_WITH_UMASK(0000)
1986 (void) mkdir_parents_label(i->path, 0755);
1987
1988 r = create_subvolume(i, i->path);
1989 if (r < 0)
1990 return r;
1991 break;
1992
1993 case EMPTY_DIRECTORY:
1994 r = glob_item(i, empty_directory);
1995 if (r < 0)
1996 return r;
1997 break;
1998
1999 case CREATE_FIFO:
2000 RUN_WITH_UMASK(0000)
2001 (void) mkdir_parents_label(i->path, 0755);
2002
2003 r = create_fifo(i, i->path);
2004 if (r < 0)
2005 return r;
2006 break;
2007
2008 case CREATE_SYMLINK: {
2009 RUN_WITH_UMASK(0000)
2010 (void) mkdir_parents_label(i->path, 0755);
2011
2012 mac_selinux_create_file_prepare(i->path, S_IFLNK);
2013 r = symlink(i->argument, i->path);
2014 mac_selinux_create_file_clear();
2015
2016 if (r < 0) {
2017 _cleanup_free_ char *x = NULL;
2018
2019 if (errno != EEXIST)
2020 return log_error_errno(errno, "symlink(%s, %s) failed: %m", i->argument, i->path);
2021
2022 r = readlink_malloc(i->path, &x);
2023 if (r < 0 || !streq(i->argument, x)) {
2024
2025 if (i->force) {
2026 mac_selinux_create_file_prepare(i->path, S_IFLNK);
2027 r = symlink_atomic(i->argument, i->path);
2028 mac_selinux_create_file_clear();
2029
2030 if (IN_SET(r, -EISDIR, -EEXIST, -ENOTEMPTY)) {
2031 r = rm_rf(i->path, REMOVE_ROOT|REMOVE_PHYSICAL);
2032 if (r < 0)
2033 return log_error_errno(r, "rm -fr %s failed: %m", i->path);
2034
2035 mac_selinux_create_file_prepare(i->path, S_IFLNK);
2036 r = symlink(i->argument, i->path) < 0 ? -errno : 0;
2037 mac_selinux_create_file_clear();
2038 }
2039 if (r < 0)
2040 return log_error_errno(r, "symlink(%s, %s) failed: %m", i->argument, i->path);
2041
2042 creation = CREATION_FORCE;
2043 } else {
2044 log_debug("\"%s\" is not a symlink or does not point to the correct path.", i->path);
2045 return 0;
2046 }
2047 } else
2048 creation = CREATION_EXISTING;
2049 } else
2050
2051 creation = CREATION_NORMAL;
2052 log_debug("%s symlink \"%s\".", creation_mode_verb_to_string(creation), i->path);
2053 break;
2054 }
2055
2056 case CREATE_BLOCK_DEVICE:
2057 case CREATE_CHAR_DEVICE:
2058 if (have_effective_cap(CAP_MKNOD) == 0) {
2059 /* In a container we lack CAP_MKNOD. We shouldn't attempt to create the device node in that
2060 * case to avoid noise, and we don't support virtualized devices in containers anyway. */
2061
2062 log_debug("We lack CAP_MKNOD, skipping creation of device node %s.", i->path);
2063 return 0;
2064 }
2065
2066 RUN_WITH_UMASK(0000)
2067 (void) mkdir_parents_label(i->path, 0755);
2068
2069 r = create_device(i, i->type == CREATE_BLOCK_DEVICE ? S_IFBLK : S_IFCHR);
2070 if (r < 0)
2071 return r;
2072
2073 break;
2074
2075 case ADJUST_MODE:
2076 case RELABEL_PATH:
2077 r = glob_item(i, path_set_perms);
2078 if (r < 0)
2079 return r;
2080 break;
2081
2082 case RECURSIVE_RELABEL_PATH:
2083 r = glob_item_recursively(i, fd_set_perms);
2084 if (r < 0)
2085 return r;
2086 break;
2087
2088 case SET_XATTR:
2089 r = glob_item(i, path_set_xattrs);
2090 if (r < 0)
2091 return r;
2092 break;
2093
2094 case RECURSIVE_SET_XATTR:
2095 r = glob_item_recursively(i, fd_set_xattrs);
2096 if (r < 0)
2097 return r;
2098 break;
2099
2100 case SET_ACL:
2101 r = glob_item(i, path_set_acls);
2102 if (r < 0)
2103 return r;
2104 break;
2105
2106 case RECURSIVE_SET_ACL:
2107 r = glob_item_recursively(i, fd_set_acls);
2108 if (r < 0)
2109 return r;
2110 break;
2111
2112 case SET_ATTRIBUTE:
2113 r = glob_item(i, path_set_attribute);
2114 if (r < 0)
2115 return r;
2116 break;
2117
2118 case RECURSIVE_SET_ATTRIBUTE:
2119 r = glob_item_recursively(i, fd_set_attribute);
2120 if (r < 0)
2121 return r;
2122 break;
2123 }
2124
2125 return 0;
2126 }
2127
2128 static int remove_item_instance(Item *i, const char *instance) {
2129 int r;
2130
2131 assert(i);
2132
2133 switch (i->type) {
2134
2135 case REMOVE_PATH:
2136 if (remove(instance) < 0 && errno != ENOENT)
2137 return log_error_errno(errno, "rm(%s): %m", instance);
2138
2139 break;
2140
2141 case RECURSIVE_REMOVE_PATH:
2142 /* FIXME: we probably should use dir_cleanup() here instead of rm_rf() so that 'x' is honoured. */
2143 log_debug("rm -rf \"%s\"", instance);
2144 r = rm_rf(instance, REMOVE_ROOT|REMOVE_SUBVOLUME|REMOVE_PHYSICAL);
2145 if (r < 0 && r != -ENOENT)
2146 return log_error_errno(r, "rm_rf(%s): %m", instance);
2147
2148 break;
2149
2150 default:
2151 assert_not_reached("wut?");
2152 }
2153
2154 return 0;
2155 }
2156
2157 static int remove_item(Item *i) {
2158 int r;
2159
2160 assert(i);
2161
2162 log_debug("Running remove action for entry %c %s", (char) i->type, i->path);
2163
2164 switch (i->type) {
2165
2166 case TRUNCATE_DIRECTORY:
2167 /* FIXME: we probably should use dir_cleanup() here instead of rm_rf() so that 'x' is honoured. */
2168 log_debug("rm -rf \"%s\"", i->path);
2169 r = rm_rf(i->path, REMOVE_PHYSICAL);
2170 if (r < 0 && r != -ENOENT)
2171 return log_error_errno(r, "rm_rf(%s): %m", i->path);
2172
2173 return 0;
2174
2175 case REMOVE_PATH:
2176 case RECURSIVE_REMOVE_PATH:
2177 return glob_item(i, remove_item_instance);
2178
2179 default:
2180 return 0;
2181 }
2182 }
2183
2184 static int clean_item_instance(Item *i, const char* instance) {
2185 _cleanup_closedir_ DIR *d = NULL;
2186 struct stat s, ps;
2187 bool mountpoint;
2188 usec_t cutoff, n;
2189 char timestamp[FORMAT_TIMESTAMP_MAX];
2190
2191 assert(i);
2192
2193 if (!i->age_set)
2194 return 0;
2195
2196 n = now(CLOCK_REALTIME);
2197 if (n < i->age)
2198 return 0;
2199
2200 cutoff = n - i->age;
2201
2202 d = opendir_nomod(instance);
2203 if (!d) {
2204 if (IN_SET(errno, ENOENT, ENOTDIR)) {
2205 log_debug_errno(errno, "Directory \"%s\": %m", instance);
2206 return 0;
2207 }
2208
2209 return log_error_errno(errno, "Failed to open directory %s: %m", instance);
2210 }
2211
2212 if (fstat(dirfd(d), &s) < 0)
2213 return log_error_errno(errno, "stat(%s) failed: %m", i->path);
2214
2215 if (!S_ISDIR(s.st_mode))
2216 return log_error_errno(SYNTHETIC_ERRNO(ENOTDIR),
2217 "%s is not a directory.", i->path);
2218
2219 if (fstatat(dirfd(d), "..", &ps, AT_SYMLINK_NOFOLLOW) != 0)
2220 return log_error_errno(errno, "stat(%s/..) failed: %m", i->path);
2221
2222 mountpoint = s.st_dev != ps.st_dev || s.st_ino == ps.st_ino;
2223
2224 log_debug("Cleanup threshold for %s \"%s\" is %s",
2225 mountpoint ? "mount point" : "directory",
2226 instance,
2227 format_timestamp_us(timestamp, sizeof(timestamp), cutoff));
2228
2229 return dir_cleanup(i, instance, d, &s, cutoff, s.st_dev, mountpoint,
2230 MAX_DEPTH, i->keep_first_level);
2231 }
2232
2233 static int clean_item(Item *i) {
2234 assert(i);
2235
2236 log_debug("Running clean action for entry %c %s", (char) i->type, i->path);
2237
2238 switch (i->type) {
2239 case CREATE_DIRECTORY:
2240 case CREATE_SUBVOLUME:
2241 case CREATE_SUBVOLUME_INHERIT_QUOTA:
2242 case CREATE_SUBVOLUME_NEW_QUOTA:
2243 case TRUNCATE_DIRECTORY:
2244 case IGNORE_PATH:
2245 case COPY_FILES:
2246 clean_item_instance(i, i->path);
2247 return 0;
2248 case EMPTY_DIRECTORY:
2249 case IGNORE_DIRECTORY_PATH:
2250 return glob_item(i, clean_item_instance);
2251 default:
2252 return 0;
2253 }
2254 }
2255
2256 static int process_item(Item *i, OperationMask operation) {
2257 OperationMask todo;
2258 int r, q, p;
2259
2260 assert(i);
2261
2262 todo = operation & ~i->done;
2263 if (todo == 0) /* Everything already done? */
2264 return 0;
2265
2266 i->done |= operation;
2267
2268 r = chase_symlinks(i->path, NULL, CHASE_NO_AUTOFS, NULL);
2269 if (r == -EREMOTE) {
2270 log_debug_errno(r, "Item '%s' is below autofs, skipping.", i->path);
2271 return 0;
2272 } else if (r < 0)
2273 log_debug_errno(r, "Failed to determine whether '%s' is below autofs, ignoring: %m", i->path);
2274
2275 r = FLAGS_SET(operation, OPERATION_CREATE) ? create_item(i) : 0;
2276 /* Failure can only be tolerated for create */
2277 if (i->allow_failure)
2278 r = 0;
2279
2280 q = FLAGS_SET(operation, OPERATION_REMOVE) ? remove_item(i) : 0;
2281 p = FLAGS_SET(operation, OPERATION_CLEAN) ? clean_item(i) : 0;
2282
2283 return r < 0 ? r :
2284 q < 0 ? q :
2285 p;
2286 }
2287
2288 static int process_item_array(ItemArray *array, OperationMask operation) {
2289 int r = 0;
2290 size_t n;
2291
2292 assert(array);
2293
2294 /* Create any parent first. */
2295 if (FLAGS_SET(operation, OPERATION_CREATE) && array->parent)
2296 r = process_item_array(array->parent, operation & OPERATION_CREATE);
2297
2298 /* Clean up all children first */
2299 if ((operation & (OPERATION_REMOVE|OPERATION_CLEAN)) && !set_isempty(array->children)) {
2300 Iterator i;
2301 ItemArray *c;
2302
2303 SET_FOREACH(c, array->children, i) {
2304 int k;
2305
2306 k = process_item_array(c, operation & (OPERATION_REMOVE|OPERATION_CLEAN));
2307 if (k < 0 && r == 0)
2308 r = k;
2309 }
2310 }
2311
2312 for (n = 0; n < array->n_items; n++) {
2313 int k;
2314
2315 k = process_item(array->items + n, operation);
2316 if (k < 0 && r == 0)
2317 r = k;
2318 }
2319
2320 return r;
2321 }
2322
2323 static void item_free_contents(Item *i) {
2324 assert(i);
2325 free(i->path);
2326 free(i->argument);
2327 strv_free(i->xattrs);
2328
2329 #if HAVE_ACL
2330 acl_free(i->acl_access);
2331 acl_free(i->acl_default);
2332 #endif
2333 }
2334
2335 static void item_array_free(ItemArray *a) {
2336 size_t n;
2337
2338 if (!a)
2339 return;
2340
2341 for (n = 0; n < a->n_items; n++)
2342 item_free_contents(a->items + n);
2343
2344 set_free(a->children);
2345 free(a->items);
2346 free(a);
2347 }
2348
2349 static int item_compare(const Item *a, const Item *b) {
2350 /* Make sure that the ownership taking item is put first, so
2351 * that we first create the node, and then can adjust it */
2352
2353 if (takes_ownership(a->type) && !takes_ownership(b->type))
2354 return -1;
2355 if (!takes_ownership(a->type) && takes_ownership(b->type))
2356 return 1;
2357
2358 return CMP(a->type, b->type);
2359 }
2360
2361 static bool item_compatible(Item *a, Item *b) {
2362 assert(a);
2363 assert(b);
2364 assert(streq(a->path, b->path));
2365
2366 if (takes_ownership(a->type) && takes_ownership(b->type))
2367 /* check if the items are the same */
2368 return streq_ptr(a->argument, b->argument) &&
2369
2370 a->uid_set == b->uid_set &&
2371 a->uid == b->uid &&
2372
2373 a->gid_set == b->gid_set &&
2374 a->gid == b->gid &&
2375
2376 a->mode_set == b->mode_set &&
2377 a->mode == b->mode &&
2378
2379 a->age_set == b->age_set &&
2380 a->age == b->age &&
2381
2382 a->mask_perms == b->mask_perms &&
2383
2384 a->keep_first_level == b->keep_first_level &&
2385
2386 a->major_minor == b->major_minor;
2387
2388 return true;
2389 }
2390
2391 static bool should_include_path(const char *path) {
2392 char **prefix;
2393
2394 STRV_FOREACH(prefix, arg_exclude_prefixes)
2395 if (path_startswith(path, *prefix)) {
2396 log_debug("Entry \"%s\" matches exclude prefix \"%s\", skipping.",
2397 path, *prefix);
2398 return false;
2399 }
2400
2401 STRV_FOREACH(prefix, arg_include_prefixes)
2402 if (path_startswith(path, *prefix)) {
2403 log_debug("Entry \"%s\" matches include prefix \"%s\".", path, *prefix);
2404 return true;
2405 }
2406
2407 /* no matches, so we should include this path only if we
2408 * have no whitelist at all */
2409 if (strv_isempty(arg_include_prefixes))
2410 return true;
2411
2412 log_debug("Entry \"%s\" does not match any include prefix, skipping.", path);
2413 return false;
2414 }
2415
2416 static int specifier_expansion_from_arg(Item *i) {
2417 _cleanup_free_ char *unescaped = NULL, *resolved = NULL;
2418 char **xattr;
2419 int r;
2420
2421 assert(i);
2422
2423 if (i->argument == NULL)
2424 return 0;
2425
2426 switch (i->type) {
2427 case COPY_FILES:
2428 case CREATE_SYMLINK:
2429 case CREATE_FILE:
2430 case TRUNCATE_FILE:
2431 case WRITE_FILE:
2432 r = cunescape(i->argument, 0, &unescaped);
2433 if (r < 0)
2434 return log_error_errno(r, "Failed to unescape parameter to write: %s", i->argument);
2435
2436 r = specifier_printf(unescaped, specifier_table, NULL, &resolved);
2437 if (r < 0)
2438 return r;
2439
2440 free_and_replace(i->argument, resolved);
2441 break;
2442
2443 case SET_XATTR:
2444 case RECURSIVE_SET_XATTR:
2445 assert(i->xattrs);
2446
2447 STRV_FOREACH (xattr, i->xattrs) {
2448 r = specifier_printf(*xattr, specifier_table, NULL, &resolved);
2449 if (r < 0)
2450 return r;
2451
2452 free_and_replace(*xattr, resolved);
2453 }
2454 break;
2455
2456 default:
2457 break;
2458 }
2459 return 0;
2460 }
2461
2462 static int patch_var_run(const char *fname, unsigned line, char **path) {
2463 const char *k;
2464 char *n;
2465
2466 assert(path);
2467 assert(*path);
2468
2469 /* Optionally rewrites lines referencing /var/run/, to use /run/ instead. Why bother? tmpfiles merges lines in
2470 * some cases and detects conflicts in others. If files/directories are specified through two equivalent lines
2471 * this is problematic as neither case will be detected. Ideally we'd detect these cases by resolving symlinks
2472 * early, but that's precisely not what we can do here as this code very likely is running very early on, at a
2473 * time where the paths in question are not available yet, or even more importantly, our own tmpfiles rules
2474 * might create the paths that are intermediary to the listed paths. We can't really cover the generic case,
2475 * but the least we can do is cover the specific case of /var/run vs. /run, as /var/run is a legacy name for
2476 * /run only, and we explicitly document that and require that on systemd systems the former is a symlink to
2477 * the latter. Moreover files below this path are by far the primary usecase for tmpfiles.d/. */
2478
2479 k = path_startswith(*path, "/var/run/");
2480 if (isempty(k)) /* Don't complain about other paths than /var/run, and not about /var/run itself either. */
2481 return 0;
2482
2483 n = strjoin("/run/", k);
2484 if (!n)
2485 return log_oom();
2486
2487 /* Also log about this briefly. We do so at LOG_NOTICE level, as we fixed up the situation automatically, hence
2488 * there's no immediate need for action by the user. However, in the interest of making things less confusing
2489 * to the user, let's still inform the user that these snippets should really be updated. */
2490
2491 log_notice("[%s:%u] Line references path below legacy directory /var/run/, updating %s → %s; please update the tmpfiles.d/ drop-in file accordingly.", fname, line, *path, n);
2492
2493 free_and_replace(*path, n);
2494
2495 return 0;
2496 }
2497
2498 static int parse_line(const char *fname, unsigned line, const char *buffer, bool *invalid_config) {
2499
2500 _cleanup_free_ char *action = NULL, *mode = NULL, *user = NULL, *group = NULL, *age = NULL, *path = NULL;
2501 _cleanup_(item_free_contents) Item i = {};
2502 ItemArray *existing;
2503 OrderedHashmap *h;
2504 int r, pos;
2505 bool force = false, boot = false, allow_failure = false;
2506
2507 assert(fname);
2508 assert(line >= 1);
2509 assert(buffer);
2510
2511 r = extract_many_words(
2512 &buffer,
2513 NULL,
2514 EXTRACT_QUOTES,
2515 &action,
2516 &path,
2517 &mode,
2518 &user,
2519 &group,
2520 &age,
2521 NULL);
2522 if (r < 0) {
2523 if (IN_SET(r, -EINVAL, -EBADSLT))
2524 /* invalid quoting and such or an unknown specifier */
2525 *invalid_config = true;
2526 return log_error_errno(r, "[%s:%u] Failed to parse line: %m", fname, line);
2527 } else if (r < 2) {
2528 *invalid_config = true;
2529 log_error("[%s:%u] Syntax error.", fname, line);
2530 return -EIO;
2531 }
2532
2533 if (!isempty(buffer) && !streq(buffer, "-")) {
2534 i.argument = strdup(buffer);
2535 if (!i.argument)
2536 return log_oom();
2537 }
2538
2539 if (isempty(action)) {
2540 *invalid_config = true;
2541 log_error("[%s:%u] Command too short '%s'.", fname, line, action);
2542 return -EINVAL;
2543 }
2544
2545 for (pos = 1; action[pos]; pos++) {
2546 if (action[pos] == '!' && !boot)
2547 boot = true;
2548 else if (action[pos] == '+' && !force)
2549 force = true;
2550 else if (action[pos] == '-' && !allow_failure)
2551 allow_failure = true;
2552 else {
2553 *invalid_config = true;
2554 log_error("[%s:%u] Unknown modifiers in command '%s'",
2555 fname, line, action);
2556 return -EINVAL;
2557 }
2558 }
2559
2560 if (boot && !arg_boot) {
2561 log_debug("Ignoring entry %s \"%s\" because --boot is not specified.",
2562 action, path);
2563 return 0;
2564 }
2565
2566 i.type = action[0];
2567 i.force = force;
2568 i.allow_failure = allow_failure;
2569
2570 r = specifier_printf(path, specifier_table, NULL, &i.path);
2571 if (r == -ENXIO)
2572 return log_unresolvable_specifier(fname, line);
2573 if (r < 0) {
2574 if (IN_SET(r, -EINVAL, -EBADSLT))
2575 *invalid_config = true;
2576 return log_error_errno(r, "[%s:%u] Failed to replace specifiers: %s", fname, line, path);
2577 }
2578
2579 r = patch_var_run(fname, line, &i.path);
2580 if (r < 0)
2581 return r;
2582
2583 switch (i.type) {
2584
2585 case CREATE_DIRECTORY:
2586 case CREATE_SUBVOLUME:
2587 case CREATE_SUBVOLUME_INHERIT_QUOTA:
2588 case CREATE_SUBVOLUME_NEW_QUOTA:
2589 case EMPTY_DIRECTORY:
2590 case TRUNCATE_DIRECTORY:
2591 case CREATE_FIFO:
2592 case IGNORE_PATH:
2593 case IGNORE_DIRECTORY_PATH:
2594 case REMOVE_PATH:
2595 case RECURSIVE_REMOVE_PATH:
2596 case ADJUST_MODE:
2597 case RELABEL_PATH:
2598 case RECURSIVE_RELABEL_PATH:
2599 if (i.argument)
2600 log_warning("[%s:%u] %c lines don't take argument fields, ignoring.", fname, line, i.type);
2601
2602 break;
2603
2604 case CREATE_FILE:
2605 case TRUNCATE_FILE:
2606 break;
2607
2608 case CREATE_SYMLINK:
2609 if (!i.argument) {
2610 i.argument = strappend("/usr/share/factory/", i.path);
2611 if (!i.argument)
2612 return log_oom();
2613 }
2614 break;
2615
2616 case WRITE_FILE:
2617 if (!i.argument) {
2618 *invalid_config = true;
2619 log_error("[%s:%u] Write file requires argument.", fname, line);
2620 return -EBADMSG;
2621 }
2622 break;
2623
2624 case COPY_FILES:
2625 if (!i.argument) {
2626 i.argument = strappend("/usr/share/factory/", i.path);
2627 if (!i.argument)
2628 return log_oom();
2629 } else if (!path_is_absolute(i.argument)) {
2630 *invalid_config = true;
2631 log_error("[%s:%u] Source path is not absolute.", fname, line);
2632 return -EBADMSG;
2633 }
2634
2635 path_simplify(i.argument, false);
2636 break;
2637
2638 case CREATE_CHAR_DEVICE:
2639 case CREATE_BLOCK_DEVICE: {
2640 unsigned major, minor;
2641
2642 if (!i.argument) {
2643 *invalid_config = true;
2644 log_error("[%s:%u] Device file requires argument.", fname, line);
2645 return -EBADMSG;
2646 }
2647
2648 if (sscanf(i.argument, "%u:%u", &major, &minor) != 2) {
2649 *invalid_config = true;
2650 log_error("[%s:%u] Can't parse device file major/minor '%s'.", fname, line, i.argument);
2651 return -EBADMSG;
2652 }
2653
2654 i.major_minor = makedev(major, minor);
2655 break;
2656 }
2657
2658 case SET_XATTR:
2659 case RECURSIVE_SET_XATTR:
2660 if (!i.argument) {
2661 *invalid_config = true;
2662 log_error("[%s:%u] Set extended attribute requires argument.", fname, line);
2663 return -EBADMSG;
2664 }
2665 r = parse_xattrs_from_arg(&i);
2666 if (r < 0)
2667 return r;
2668 break;
2669
2670 case SET_ACL:
2671 case RECURSIVE_SET_ACL:
2672 if (!i.argument) {
2673 *invalid_config = true;
2674 log_error("[%s:%u] Set ACLs requires argument.", fname, line);
2675 return -EBADMSG;
2676 }
2677 r = parse_acls_from_arg(&i);
2678 if (r < 0)
2679 return r;
2680 break;
2681
2682 case SET_ATTRIBUTE:
2683 case RECURSIVE_SET_ATTRIBUTE:
2684 if (!i.argument) {
2685 *invalid_config = true;
2686 log_error("[%s:%u] Set file attribute requires argument.", fname, line);
2687 return -EBADMSG;
2688 }
2689 r = parse_attribute_from_arg(&i);
2690 if (IN_SET(r, -EINVAL, -EBADSLT))
2691 *invalid_config = true;
2692 if (r < 0)
2693 return r;
2694 break;
2695
2696 default:
2697 log_error("[%s:%u] Unknown command type '%c'.", fname, line, (char) i.type);
2698 *invalid_config = true;
2699 return -EBADMSG;
2700 }
2701
2702 if (!path_is_absolute(i.path)) {
2703 log_error("[%s:%u] Path '%s' not absolute.", fname, line, i.path);
2704 *invalid_config = true;
2705 return -EBADMSG;
2706 }
2707
2708 path_simplify(i.path, false);
2709
2710 if (!should_include_path(i.path))
2711 return 0;
2712
2713 r = specifier_expansion_from_arg(&i);
2714 if (r == -ENXIO)
2715 return log_unresolvable_specifier(fname, line);
2716 if (r < 0) {
2717 if (IN_SET(r, -EINVAL, -EBADSLT))
2718 *invalid_config = true;
2719 return log_error_errno(r, "[%s:%u] Failed to substitute specifiers in argument: %m",
2720 fname, line);
2721 }
2722
2723 if (arg_root) {
2724 char *p;
2725
2726 p = prefix_root(arg_root, i.path);
2727 if (!p)
2728 return log_oom();
2729
2730 free_and_replace(i.path, p);
2731 }
2732
2733 if (!isempty(user) && !streq(user, "-")) {
2734 const char *u = user;
2735
2736 r = get_user_creds(&u, &i.uid, NULL, NULL, NULL, USER_CREDS_ALLOW_MISSING);
2737 if (r < 0) {
2738 *invalid_config = true;
2739 return log_error_errno(r, "[%s:%u] Unknown user '%s'.", fname, line, user);
2740 }
2741
2742 i.uid_set = true;
2743 }
2744
2745 if (!isempty(group) && !streq(group, "-")) {
2746 const char *g = group;
2747
2748 r = get_group_creds(&g, &i.gid, USER_CREDS_ALLOW_MISSING);
2749 if (r < 0) {
2750 *invalid_config = true;
2751 log_error("[%s:%u] Unknown group '%s'.", fname, line, group);
2752 return r;
2753 }
2754
2755 i.gid_set = true;
2756 }
2757
2758 if (!isempty(mode) && !streq(mode, "-")) {
2759 const char *mm = mode;
2760 unsigned m;
2761
2762 if (*mm == '~') {
2763 i.mask_perms = true;
2764 mm++;
2765 }
2766
2767 if (parse_mode(mm, &m) < 0) {
2768 *invalid_config = true;
2769 log_error("[%s:%u] Invalid mode '%s'.", fname, line, mode);
2770 return -EBADMSG;
2771 }
2772
2773 i.mode = m;
2774 i.mode_set = true;
2775 } else
2776 i.mode = IN_SET(i.type, CREATE_DIRECTORY, TRUNCATE_DIRECTORY, CREATE_SUBVOLUME, CREATE_SUBVOLUME_INHERIT_QUOTA, CREATE_SUBVOLUME_NEW_QUOTA) ? 0755 : 0644;
2777
2778 if (!isempty(age) && !streq(age, "-")) {
2779 const char *a = age;
2780
2781 if (*a == '~') {
2782 i.keep_first_level = true;
2783 a++;
2784 }
2785
2786 if (parse_sec(a, &i.age) < 0) {
2787 *invalid_config = true;
2788 log_error("[%s:%u] Invalid age '%s'.", fname, line, age);
2789 return -EBADMSG;
2790 }
2791
2792 i.age_set = true;
2793 }
2794
2795 h = needs_glob(i.type) ? globs : items;
2796
2797 existing = ordered_hashmap_get(h, i.path);
2798 if (existing) {
2799 size_t n;
2800
2801 for (n = 0; n < existing->n_items; n++) {
2802 if (!item_compatible(existing->items + n, &i)) {
2803 log_notice("[%s:%u] Duplicate line for path \"%s\", ignoring.",
2804 fname, line, i.path);
2805 return 0;
2806 }
2807 }
2808 } else {
2809 existing = new0(ItemArray, 1);
2810 if (!existing)
2811 return log_oom();
2812
2813 r = ordered_hashmap_put(h, i.path, existing);
2814 if (r < 0) {
2815 free(existing);
2816 return log_oom();
2817 }
2818 }
2819
2820 if (!GREEDY_REALLOC(existing->items, existing->allocated, existing->n_items + 1))
2821 return log_oom();
2822
2823 existing->items[existing->n_items++] = i;
2824 i = (struct Item) {};
2825
2826 /* Sort item array, to enforce stable ordering of application */
2827 typesafe_qsort(existing->items, existing->n_items, item_compare);
2828
2829 return 0;
2830 }
2831
2832 static int cat_config(char **config_dirs, char **args) {
2833 _cleanup_strv_free_ char **files = NULL;
2834 int r;
2835
2836 r = conf_files_list_with_replacement(arg_root, config_dirs, arg_replace, &files, NULL);
2837 if (r < 0)
2838 return r;
2839
2840 return cat_files(NULL, files, 0);
2841 }
2842
2843 static int help(void) {
2844 _cleanup_free_ char *link = NULL;
2845 int r;
2846
2847 r = terminal_urlify_man("systemd-tmpfiles", "8", &link);
2848 if (r < 0)
2849 return log_oom();
2850
2851 printf("%s [OPTIONS...] [CONFIGURATION FILE...]\n\n"
2852 "Creates, deletes and cleans up volatile and temporary files and directories.\n\n"
2853 " -h --help Show this help\n"
2854 " --user Execute user configuration\n"
2855 " --version Show package version\n"
2856 " --cat-config Show configuration files\n"
2857 " --create Create marked files/directories\n"
2858 " --clean Clean up marked directories\n"
2859 " --remove Remove marked files/directories\n"
2860 " --boot Execute actions only safe at boot\n"
2861 " --prefix=PATH Only apply rules with the specified prefix\n"
2862 " --exclude-prefix=PATH Ignore rules with the specified prefix\n"
2863 " --root=PATH Operate on an alternate filesystem root\n"
2864 " --replace=PATH Treat arguments as replacement for PATH\n"
2865 " --no-pager Do not pipe output into a pager\n"
2866 "\nSee the %s for details.\n"
2867 , program_invocation_short_name
2868 , link
2869 );
2870
2871 return 0;
2872 }
2873
2874 static int parse_argv(int argc, char *argv[]) {
2875
2876 enum {
2877 ARG_VERSION = 0x100,
2878 ARG_CAT_CONFIG,
2879 ARG_USER,
2880 ARG_CREATE,
2881 ARG_CLEAN,
2882 ARG_REMOVE,
2883 ARG_BOOT,
2884 ARG_PREFIX,
2885 ARG_EXCLUDE_PREFIX,
2886 ARG_ROOT,
2887 ARG_REPLACE,
2888 ARG_NO_PAGER,
2889 };
2890
2891 static const struct option options[] = {
2892 { "help", no_argument, NULL, 'h' },
2893 { "user", no_argument, NULL, ARG_USER },
2894 { "version", no_argument, NULL, ARG_VERSION },
2895 { "cat-config", no_argument, NULL, ARG_CAT_CONFIG },
2896 { "create", no_argument, NULL, ARG_CREATE },
2897 { "clean", no_argument, NULL, ARG_CLEAN },
2898 { "remove", no_argument, NULL, ARG_REMOVE },
2899 { "boot", no_argument, NULL, ARG_BOOT },
2900 { "prefix", required_argument, NULL, ARG_PREFIX },
2901 { "exclude-prefix", required_argument, NULL, ARG_EXCLUDE_PREFIX },
2902 { "root", required_argument, NULL, ARG_ROOT },
2903 { "replace", required_argument, NULL, ARG_REPLACE },
2904 { "no-pager", no_argument, NULL, ARG_NO_PAGER },
2905 {}
2906 };
2907
2908 int c, r;
2909
2910 assert(argc >= 0);
2911 assert(argv);
2912
2913 while ((c = getopt_long(argc, argv, "h", options, NULL)) >= 0)
2914
2915 switch (c) {
2916
2917 case 'h':
2918 return help();
2919
2920 case ARG_VERSION:
2921 return version();
2922
2923 case ARG_CAT_CONFIG:
2924 arg_cat_config = true;
2925 break;
2926
2927 case ARG_USER:
2928 arg_user = true;
2929 break;
2930
2931 case ARG_CREATE:
2932 arg_operation |= OPERATION_CREATE;
2933 break;
2934
2935 case ARG_CLEAN:
2936 arg_operation |= OPERATION_CLEAN;
2937 break;
2938
2939 case ARG_REMOVE:
2940 arg_operation |= OPERATION_REMOVE;
2941 break;
2942
2943 case ARG_BOOT:
2944 arg_boot = true;
2945 break;
2946
2947 case ARG_PREFIX:
2948 if (strv_push(&arg_include_prefixes, optarg) < 0)
2949 return log_oom();
2950 break;
2951
2952 case ARG_EXCLUDE_PREFIX:
2953 if (strv_push(&arg_exclude_prefixes, optarg) < 0)
2954 return log_oom();
2955 break;
2956
2957 case ARG_ROOT:
2958 r = parse_path_argument_and_warn(optarg, true, &arg_root);
2959 if (r < 0)
2960 return r;
2961 break;
2962
2963 case ARG_REPLACE:
2964 if (!path_is_absolute(optarg) ||
2965 !endswith(optarg, ".conf"))
2966 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
2967 "The argument to --replace= must an absolute path to a config file");
2968
2969 arg_replace = optarg;
2970 break;
2971
2972 case ARG_NO_PAGER:
2973 arg_pager_flags |= PAGER_DISABLE;
2974 break;
2975
2976 case '?':
2977 return -EINVAL;
2978
2979 default:
2980 assert_not_reached("Unhandled option");
2981 }
2982
2983 if (arg_operation == 0 && !arg_cat_config)
2984 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
2985 "You need to specify at least one of --clean, --create or --remove.");
2986
2987 if (arg_replace && arg_cat_config)
2988 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
2989 "Option --replace= is not supported with --cat-config");
2990
2991 if (arg_replace && optind >= argc)
2992 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
2993 "When --replace= is given, some configuration items must be specified");
2994
2995 return 1;
2996 }
2997
2998 static int read_config_file(char **config_dirs, const char *fn, bool ignore_enoent, bool *invalid_config) {
2999 _cleanup_fclose_ FILE *_f = NULL;
3000 Iterator iterator;
3001 unsigned v = 0;
3002 FILE *f;
3003 Item *i;
3004 int r = 0;
3005
3006 assert(fn);
3007
3008 if (streq(fn, "-")) {
3009 log_debug("Reading config from stdin…");
3010 fn = "<stdin>";
3011 f = stdin;
3012 } else {
3013 r = search_and_fopen(fn, "re", arg_root, (const char**) config_dirs, &_f);
3014 if (r < 0) {
3015 if (ignore_enoent && r == -ENOENT) {
3016 log_debug_errno(r, "Failed to open \"%s\", ignoring: %m", fn);
3017 return 0;
3018 }
3019
3020 return log_error_errno(r, "Failed to open '%s': %m", fn);
3021 }
3022 log_debug("Reading config file \"%s\"…", fn);
3023 f = _f;
3024 }
3025
3026 for (;;) {
3027 _cleanup_free_ char *line = NULL;
3028 bool invalid_line = false;
3029 char *l;
3030 int k;
3031
3032 k = read_line(f, LONG_LINE_MAX, &line);
3033 if (k < 0)
3034 return log_error_errno(k, "Failed to read '%s': %m", fn);
3035 if (k == 0)
3036 break;
3037
3038 v++;
3039
3040 l = strstrip(line);
3041 if (IN_SET(*l, 0, '#'))
3042 continue;
3043
3044 k = parse_line(fn, v, l, &invalid_line);
3045 if (k < 0) {
3046 if (invalid_line)
3047 /* Allow reporting with a special code if the caller requested this */
3048 *invalid_config = true;
3049 else if (r == 0)
3050 /* The first error becomes our return value */
3051 r = k;
3052 }
3053 }
3054
3055 /* we have to determine age parameter for each entry of type X */
3056 ORDERED_HASHMAP_FOREACH(i, globs, iterator) {
3057 Iterator iter;
3058 Item *j, *candidate_item = NULL;
3059
3060 if (i->type != IGNORE_DIRECTORY_PATH)
3061 continue;
3062
3063 ORDERED_HASHMAP_FOREACH(j, items, iter) {
3064 if (!IN_SET(j->type, CREATE_DIRECTORY, TRUNCATE_DIRECTORY, CREATE_SUBVOLUME, CREATE_SUBVOLUME_INHERIT_QUOTA, CREATE_SUBVOLUME_NEW_QUOTA))
3065 continue;
3066
3067 if (path_equal(j->path, i->path)) {
3068 candidate_item = j;
3069 break;
3070 }
3071
3072 if ((!candidate_item && path_startswith(i->path, j->path)) ||
3073 (candidate_item && path_startswith(j->path, candidate_item->path) && (fnmatch(i->path, j->path, FNM_PATHNAME | FNM_PERIOD) == 0)))
3074 candidate_item = j;
3075 }
3076
3077 if (candidate_item && candidate_item->age_set) {
3078 i->age = candidate_item->age;
3079 i->age_set = true;
3080 }
3081 }
3082
3083 if (ferror(f)) {
3084 log_error_errno(errno, "Failed to read from file %s: %m", fn);
3085 if (r == 0)
3086 r = -EIO;
3087 }
3088
3089 return r;
3090 }
3091
3092 static int parse_arguments(char **config_dirs, char **args, bool *invalid_config) {
3093 char **arg;
3094 int r;
3095
3096 STRV_FOREACH(arg, args) {
3097 r = read_config_file(config_dirs, *arg, false, invalid_config);
3098 if (r < 0)
3099 return r;
3100 }
3101
3102 return 0;
3103 }
3104
3105 static int read_config_files(char **config_dirs, char **args, bool *invalid_config) {
3106 _cleanup_strv_free_ char **files = NULL;
3107 _cleanup_free_ char *p = NULL;
3108 char **f;
3109 int r;
3110
3111 r = conf_files_list_with_replacement(arg_root, config_dirs, arg_replace, &files, &p);
3112 if (r < 0)
3113 return r;
3114
3115 STRV_FOREACH(f, files)
3116 if (p && path_equal(*f, p)) {
3117 log_debug("Parsing arguments at position \"%s\"…", *f);
3118
3119 r = parse_arguments(config_dirs, args, invalid_config);
3120 if (r < 0)
3121 return r;
3122 } else
3123 /* Just warn, ignore result otherwise.
3124 * read_config_file() has some debug output, so no need to print anything. */
3125 (void) read_config_file(config_dirs, *f, true, invalid_config);
3126
3127 return 0;
3128 }
3129
3130 static int link_parent(ItemArray *a) {
3131 const char *path;
3132 char *prefix;
3133 int r;
3134
3135 assert(a);
3136
3137 /* Finds the closest "parent" item array for the specified item array. Then registers the specified item array
3138 * as child of it, and fills the parent in, linking them both ways. This allows us to later create parents
3139 * before their children, and clean up/remove children before their parents. */
3140
3141 if (a->n_items <= 0)
3142 return 0;
3143
3144 path = a->items[0].path;
3145 prefix = alloca(strlen(path) + 1);
3146 PATH_FOREACH_PREFIX(prefix, path) {
3147 ItemArray *j;
3148
3149 j = ordered_hashmap_get(items, prefix);
3150 if (!j)
3151 j = ordered_hashmap_get(globs, prefix);
3152 if (j) {
3153 r = set_ensure_allocated(&j->children, NULL);
3154 if (r < 0)
3155 return log_oom();
3156
3157 r = set_put(j->children, a);
3158 if (r < 0)
3159 return log_oom();
3160
3161 a->parent = j;
3162 return 1;
3163 }
3164 }
3165
3166 return 0;
3167 }
3168
3169 int main(int argc, char *argv[]) {
3170 _cleanup_strv_free_ char **config_dirs = NULL;
3171 int r, k, r_process = 0;
3172 bool invalid_config = false;
3173 Iterator iterator;
3174 ItemArray *a;
3175 enum {
3176 PHASE_REMOVE_AND_CLEAN,
3177 PHASE_CREATE,
3178 _PHASE_MAX
3179 } phase;
3180
3181 r = parse_argv(argc, argv);
3182 if (r <= 0)
3183 goto finish;
3184
3185 log_setup_service();
3186
3187 if (arg_user) {
3188 r = user_config_paths(&config_dirs);
3189 if (r < 0) {
3190 log_error_errno(r, "Failed to initialize configuration directory list: %m");
3191 goto finish;
3192 }
3193 } else {
3194 config_dirs = strv_split_nulstr(CONF_PATHS_NULSTR("tmpfiles.d"));
3195 if (!config_dirs) {
3196 r = log_oom();
3197 goto finish;
3198 }
3199 }
3200
3201 if (DEBUG_LOGGING) {
3202 _cleanup_free_ char *t = NULL;
3203
3204 t = strv_join(config_dirs, "\n\t");
3205 if (t)
3206 log_debug("Looking for configuration files in (higher priority first):\n\t%s", t);
3207 }
3208
3209 if (arg_cat_config) {
3210 (void) pager_open(arg_pager_flags);
3211
3212 r = cat_config(config_dirs, argv + optind);
3213 goto finish;
3214 }
3215
3216 umask(0022);
3217
3218 mac_selinux_init();
3219
3220 items = ordered_hashmap_new(&string_hash_ops);
3221 globs = ordered_hashmap_new(&string_hash_ops);
3222
3223 if (!items || !globs) {
3224 r = log_oom();
3225 goto finish;
3226 }
3227
3228 /* If command line arguments are specified along with --replace, read all
3229 * configuration files and insert the positional arguments at the specified
3230 * place. Otherwise, if command line arguments are specified, execute just
3231 * them, and finally, without --replace= or any positional arguments, just
3232 * read configuration and execute it.
3233 */
3234 if (arg_replace || optind >= argc)
3235 r = read_config_files(config_dirs, argv + optind, &invalid_config);
3236 else
3237 r = parse_arguments(config_dirs, argv + optind, &invalid_config);
3238 if (r < 0)
3239 goto finish;
3240
3241 /* Let's now link up all child/parent relationships */
3242 ORDERED_HASHMAP_FOREACH(a, items, iterator) {
3243 r = link_parent(a);
3244 if (r < 0)
3245 goto finish;
3246 }
3247 ORDERED_HASHMAP_FOREACH(a, globs, iterator) {
3248 r = link_parent(a);
3249 if (r < 0)
3250 goto finish;
3251 }
3252
3253 /* If multiple operations are requested, let's first run the remove/clean operations, and only then the create
3254 * operations. i.e. that we first clean out the platform we then build on. */
3255 for (phase = 0; phase < _PHASE_MAX; phase++) {
3256 OperationMask op;
3257
3258 if (phase == PHASE_REMOVE_AND_CLEAN)
3259 op = arg_operation & (OPERATION_REMOVE|OPERATION_CLEAN);
3260 else if (phase == PHASE_CREATE)
3261 op = arg_operation & OPERATION_CREATE;
3262 else
3263 assert_not_reached("unexpected phase");
3264
3265 if (op == 0) /* Nothing requested in this phase */
3266 continue;
3267
3268 /* The non-globbing ones usually create things, hence we apply them first */
3269 ORDERED_HASHMAP_FOREACH(a, items, iterator) {
3270 k = process_item_array(a, op);
3271 if (k < 0 && r_process == 0)
3272 r_process = k;
3273 }
3274
3275 /* The globbing ones usually alter things, hence we apply them second. */
3276 ORDERED_HASHMAP_FOREACH(a, globs, iterator) {
3277 k = process_item_array(a, op);
3278 if (k < 0 && r_process == 0)
3279 r_process = k;
3280 }
3281 }
3282
3283 finish:
3284 pager_close();
3285
3286 ordered_hashmap_free_with_destructor(items, item_array_free);
3287 ordered_hashmap_free_with_destructor(globs, item_array_free);
3288
3289 free(arg_include_prefixes);
3290 free(arg_exclude_prefixes);
3291 free(arg_root);
3292
3293 set_free_free(unix_sockets);
3294
3295 mac_selinux_finish();
3296
3297 if (r < 0 || ERRNO_IS_RESOURCE(-r_process))
3298 return EXIT_FAILURE;
3299 else if (invalid_config)
3300 return EX_DATAERR;
3301 else if (r_process < 0)
3302 return EX_CANTCREAT;
3303 else
3304 return EXIT_SUCCESS;
3305 }
Unnamed repository; edit this file 'description' to name the repository.