]> git.ipfire.org Git - thirdparty/systemd.git/blob - src/tmpfiles/tmpfiles.c
projects / thirdparty / systemd.git / blob
? search:
summary | shortlog | log | commit | commitdiff | tree
blame | history | raw | HEAD
Merge pull request #13895 from jsynacek/master
[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 "mkdir.h"
45 #include "mountpoint-util.h"
46 #include "pager.h"
47 #include "parse-util.h"
48 #include "path-lookup.h"
49 #include "path-util.h"
50 #include "pretty-print.h"
51 #include "rlimit-util.h"
52 #include "rm-rf.h"
53 #include "selinux-util.h"
54 #include "set.h"
55 #include "sort-util.h"
56 #include "specifier.h"
57 #include "stat-util.h"
58 #include "stdio-util.h"
59 #include "string-table.h"
60 #include "string-util.h"
61 #include "strv.h"
62 #include "umask-util.h"
63 #include "user-util.h"
64
65 /* This reads all files listed in /etc/tmpfiles.d/?*.conf and creates
66 * them in the file system. This is intended to be used to create
67 * properly owned directories beneath /tmp, /var/tmp, /run, which are
68 * volatile and hence need to be recreated on bootup. */
69
70 typedef enum OperationMask {
71 OPERATION_CREATE = 1 << 0,
72 OPERATION_REMOVE = 1 << 1,
73 OPERATION_CLEAN = 1 << 2,
74 } OperationMask;
75
76 typedef enum ItemType {
77 /* These ones take file names */
78 CREATE_FILE = 'f',
79 TRUNCATE_FILE = 'F',
80 CREATE_DIRECTORY = 'd',
81 TRUNCATE_DIRECTORY = 'D',
82 CREATE_SUBVOLUME = 'v',
83 CREATE_SUBVOLUME_INHERIT_QUOTA = 'q',
84 CREATE_SUBVOLUME_NEW_QUOTA = 'Q',
85 CREATE_FIFO = 'p',
86 CREATE_SYMLINK = 'L',
87 CREATE_CHAR_DEVICE = 'c',
88 CREATE_BLOCK_DEVICE = 'b',
89 COPY_FILES = 'C',
90
91 /* These ones take globs */
92 WRITE_FILE = 'w',
93 EMPTY_DIRECTORY = 'e',
94 SET_XATTR = 't',
95 RECURSIVE_SET_XATTR = 'T',
96 SET_ACL = 'a',
97 RECURSIVE_SET_ACL = 'A',
98 SET_ATTRIBUTE = 'h',
99 RECURSIVE_SET_ATTRIBUTE = 'H',
100 IGNORE_PATH = 'x',
101 IGNORE_DIRECTORY_PATH = 'X',
102 REMOVE_PATH = 'r',
103 RECURSIVE_REMOVE_PATH = 'R',
104 RELABEL_PATH = 'z',
105 RECURSIVE_RELABEL_PATH = 'Z',
106 ADJUST_MODE = 'm', /* legacy, 'z' is identical to this */
107 } ItemType;
108
109 typedef struct Item {
110 ItemType type;
111
112 char *path;
113 char *argument;
114 char **xattrs;
115 #if HAVE_ACL
116 acl_t acl_access;
117 acl_t acl_default;
118 #endif
119 uid_t uid;
120 gid_t gid;
121 mode_t mode;
122 usec_t age;
123
124 dev_t major_minor;
125 unsigned attribute_value;
126 unsigned attribute_mask;
127
128 bool uid_set:1;
129 bool gid_set:1;
130 bool mode_set:1;
131 bool age_set:1;
132 bool mask_perms:1;
133 bool attribute_set:1;
134
135 bool keep_first_level:1;
136
137 bool append_or_force:1;
138
139 bool allow_failure:1;
140
141 OperationMask done;
142 } Item;
143
144 typedef struct ItemArray {
145 Item *items;
146 size_t n_items;
147 size_t allocated;
148
149 struct ItemArray *parent;
150 Set *children;
151 } ItemArray;
152
153 typedef enum DirectoryType {
154 DIRECTORY_RUNTIME,
155 DIRECTORY_STATE,
156 DIRECTORY_CACHE,
157 DIRECTORY_LOGS,
158 _DIRECTORY_TYPE_MAX,
159 } DirectoryType;
160
161 static bool arg_cat_config = false;
162 static bool arg_user = false;
163 static OperationMask arg_operation = 0;
164 static bool arg_boot = false;
165 static PagerFlags arg_pager_flags = 0;
166
167 static char **arg_include_prefixes = NULL;
168 static char **arg_exclude_prefixes = NULL;
169 static char *arg_root = NULL;
170 static char *arg_replace = NULL;
171
172 #define MAX_DEPTH 256
173
174 static OrderedHashmap *items = NULL, *globs = NULL;
175 static Set *unix_sockets = NULL;
176
177 STATIC_DESTRUCTOR_REGISTER(items, ordered_hashmap_freep);
178 STATIC_DESTRUCTOR_REGISTER(globs, ordered_hashmap_freep);
179 STATIC_DESTRUCTOR_REGISTER(unix_sockets, set_free_freep);
180 STATIC_DESTRUCTOR_REGISTER(arg_include_prefixes, freep);
181 STATIC_DESTRUCTOR_REGISTER(arg_exclude_prefixes, freep);
182 STATIC_DESTRUCTOR_REGISTER(arg_root, freep);
183
184 static int specifier_machine_id_safe(char specifier, const void *data, const void *userdata, char **ret);
185 static int specifier_directory(char specifier, const void *data, const void *userdata, char **ret);
186
187 static const Specifier specifier_table[] = {
188 { 'm', specifier_machine_id_safe, NULL },
189 { 'b', specifier_boot_id, NULL },
190 { 'H', specifier_host_name, NULL },
191 { 'v', specifier_kernel_release, NULL },
192
193 { 'g', specifier_group_name, NULL },
194 { 'G', specifier_group_id, NULL },
195 { 'U', specifier_user_id, NULL },
196 { 'u', specifier_user_name, NULL },
197 { 'h', specifier_user_home, NULL },
198
199 { 't', specifier_directory, UINT_TO_PTR(DIRECTORY_RUNTIME) },
200 { 'S', specifier_directory, UINT_TO_PTR(DIRECTORY_STATE) },
201 { 'C', specifier_directory, UINT_TO_PTR(DIRECTORY_CACHE) },
202 { 'L', specifier_directory, UINT_TO_PTR(DIRECTORY_LOGS) },
203 { 'T', specifier_tmp_dir, NULL },
204 { 'V', specifier_var_tmp_dir, NULL },
205 {}
206 };
207
208 static int specifier_machine_id_safe(char specifier, const void *data, const void *userdata, char **ret) {
209 int r;
210
211 /* If /etc/machine_id is missing or empty (e.g. in a chroot environment)
212 * return a recognizable error so that the caller can skip the rule
213 * gracefully. */
214
215 r = specifier_machine_id(specifier, data, userdata, ret);
216 if (IN_SET(r, -ENOENT, -ENOMEDIUM))
217 return -ENXIO;
218
219 return r;
220 }
221
222 static int specifier_directory(char specifier, const void *data, const void *userdata, char **ret) {
223 struct table_entry {
224 uint64_t type;
225 const char *suffix;
226 };
227
228 static const struct table_entry paths_system[] = {
229 [DIRECTORY_RUNTIME] = { SD_PATH_SYSTEM_RUNTIME },
230 [DIRECTORY_STATE] = { SD_PATH_SYSTEM_STATE_PRIVATE },
231 [DIRECTORY_CACHE] = { SD_PATH_SYSTEM_STATE_CACHE },
232 [DIRECTORY_LOGS] = { SD_PATH_SYSTEM_STATE_LOGS },
233 };
234
235 static const struct table_entry paths_user[] = {
236 [DIRECTORY_RUNTIME] = { SD_PATH_USER_RUNTIME },
237 [DIRECTORY_STATE] = { SD_PATH_USER_CONFIGURATION },
238 [DIRECTORY_CACHE] = { SD_PATH_USER_STATE_CACHE },
239 [DIRECTORY_LOGS] = { SD_PATH_USER_CONFIGURATION, "log" },
240 };
241
242 unsigned i;
243 const struct table_entry *paths;
244
245 assert_cc(ELEMENTSOF(paths_system) == ELEMENTSOF(paths_user));
246 paths = arg_user ? paths_user : paths_system;
247
248 i = PTR_TO_UINT(data);
249 assert(i < ELEMENTSOF(paths_system));
250
251 return sd_path_home(paths[i].type, paths[i].suffix, ret);
252 }
253
254 static int log_unresolvable_specifier(const char *filename, unsigned line) {
255 static bool notified = false;
256
257 /* In system mode, this is called when /etc is not fully initialized (e.g.
258 * in a chroot environment) where some specifiers are unresolvable. In user
259 * mode, this is called when some variables are not defined. These cases are
260 * not considered as an error so log at LOG_NOTICE only for the first time
261 * and then downgrade this to LOG_DEBUG for the rest. */
262
263 log_full(notified ? LOG_DEBUG : LOG_NOTICE,
264 "[%s:%u] Failed to resolve specifier: %s, skipping",
265 filename, line,
266 arg_user ? "Required $XDG_... variable not defined" : "uninitialized /etc detected");
267
268 if (!notified)
269 log_notice("All rules containing unresolvable specifiers will be skipped.");
270
271 notified = true;
272 return 0;
273 }
274
275 static int user_config_paths(char*** ret) {
276 _cleanup_strv_free_ char **config_dirs = NULL, **data_dirs = NULL;
277 _cleanup_free_ char *persistent_config = NULL, *runtime_config = NULL, *data_home = NULL;
278 _cleanup_strv_free_ char **res = NULL;
279 int r;
280
281 r = xdg_user_dirs(&config_dirs, &data_dirs);
282 if (r < 0)
283 return r;
284
285 r = xdg_user_config_dir(&persistent_config, "/user-tmpfiles.d");
286 if (r < 0 && r != -ENXIO)
287 return r;
288
289 r = xdg_user_runtime_dir(&runtime_config, "/user-tmpfiles.d");
290 if (r < 0 && r != -ENXIO)
291 return r;
292
293 r = xdg_user_data_dir(&data_home, "/user-tmpfiles.d");
294 if (r < 0 && r != -ENXIO)
295 return r;
296
297 r = strv_extend_strv_concat(&res, config_dirs, "/user-tmpfiles.d");
298 if (r < 0)
299 return r;
300
301 r = strv_extend(&res, persistent_config);
302 if (r < 0)
303 return r;
304
305 r = strv_extend(&res, runtime_config);
306 if (r < 0)
307 return r;
308
309 r = strv_extend(&res, data_home);
310 if (r < 0)
311 return r;
312
313 r = strv_extend_strv_concat(&res, data_dirs, "/user-tmpfiles.d");
314 if (r < 0)
315 return r;
316
317 r = path_strv_make_absolute_cwd(res);
318 if (r < 0)
319 return r;
320
321 *ret = TAKE_PTR(res);
322 return 0;
323 }
324
325 static bool needs_glob(ItemType t) {
326 return IN_SET(t,
327 WRITE_FILE,
328 IGNORE_PATH,
329 IGNORE_DIRECTORY_PATH,
330 REMOVE_PATH,
331 RECURSIVE_REMOVE_PATH,
332 EMPTY_DIRECTORY,
333 ADJUST_MODE,
334 RELABEL_PATH,
335 RECURSIVE_RELABEL_PATH,
336 SET_XATTR,
337 RECURSIVE_SET_XATTR,
338 SET_ACL,
339 RECURSIVE_SET_ACL,
340 SET_ATTRIBUTE,
341 RECURSIVE_SET_ATTRIBUTE);
342 }
343
344 static bool takes_ownership(ItemType t) {
345 return IN_SET(t,
346 CREATE_FILE,
347 TRUNCATE_FILE,
348 CREATE_DIRECTORY,
349 EMPTY_DIRECTORY,
350 TRUNCATE_DIRECTORY,
351 CREATE_SUBVOLUME,
352 CREATE_SUBVOLUME_INHERIT_QUOTA,
353 CREATE_SUBVOLUME_NEW_QUOTA,
354 CREATE_FIFO,
355 CREATE_SYMLINK,
356 CREATE_CHAR_DEVICE,
357 CREATE_BLOCK_DEVICE,
358 COPY_FILES,
359 WRITE_FILE,
360 IGNORE_PATH,
361 IGNORE_DIRECTORY_PATH,
362 REMOVE_PATH,
363 RECURSIVE_REMOVE_PATH);
364 }
365
366 static struct Item* find_glob(OrderedHashmap *h, const char *match) {
367 ItemArray *j;
368 Iterator i;
369
370 ORDERED_HASHMAP_FOREACH(j, h, i) {
371 size_t n;
372
373 for (n = 0; n < j->n_items; n++) {
374 Item *item = j->items + n;
375
376 if (fnmatch(item->path, match, FNM_PATHNAME|FNM_PERIOD) == 0)
377 return item;
378 }
379 }
380
381 return NULL;
382 }
383
384 static int load_unix_sockets(void) {
385 _cleanup_set_free_free_ Set *sockets = NULL;
386 _cleanup_fclose_ FILE *f = NULL;
387 int r;
388
389 if (unix_sockets)
390 return 0;
391
392 /* We maintain a cache of the sockets we found in /proc/net/unix to speed things up a little. */
393
394 sockets = set_new(&path_hash_ops);
395 if (!sockets)
396 return log_oom();
397
398 f = fopen("/proc/net/unix", "re");
399 if (!f)
400 return log_full_errno(errno == ENOENT ? LOG_DEBUG : LOG_WARNING, errno,
401 "Failed to open /proc/net/unix, ignoring: %m");
402
403 /* Skip header */
404 r = read_line(f, LONG_LINE_MAX, NULL);
405 if (r < 0)
406 return log_warning_errno(r, "Failed to skip /proc/net/unix header line: %m");
407 if (r == 0)
408 return log_warning_errno(SYNTHETIC_ERRNO(EIO), "Premature end of file reading /proc/net/unix.");
409
410 for (;;) {
411 _cleanup_free_ char *line = NULL, *s = NULL;
412 char *p;
413
414 r = read_line(f, LONG_LINE_MAX, &line);
415 if (r < 0)
416 return log_warning_errno(r, "Failed to read /proc/net/unix line, ignoring: %m");
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 return log_oom();
438
439 path_simplify(s, false);
440
441 r = set_consume(sockets, s);
442 if (r == -EEXIST)
443 continue;
444 if (r < 0)
445 return log_warning_errno(r, "Failed to add AF_UNIX socket to set, ignoring: %m");
446
447 TAKE_PTR(s);
448 }
449
450 unix_sockets = TAKE_PTR(sockets);
451 return 1;
452 }
453
454 static bool unix_socket_alive(const char *fn) {
455 assert(fn);
456
457 if (load_unix_sockets() < 0)
458 return true; /* We don't know, so assume yes */
459
460 return !!set_get(unix_sockets, (char*) fn);
461 }
462
463 static DIR* xopendirat_nomod(int dirfd, const char *path) {
464 DIR *dir;
465
466 dir = xopendirat(dirfd, path, O_NOFOLLOW|O_NOATIME);
467 if (dir)
468 return dir;
469
470 log_debug_errno(errno, "Cannot open %sdirectory \"%s\": %m", dirfd == AT_FDCWD ? "" : "sub", path);
471 if (errno != EPERM)
472 return NULL;
473
474 dir = xopendirat(dirfd, path, O_NOFOLLOW);
475 if (!dir)
476 log_debug_errno(errno, "Cannot open %sdirectory \"%s\": %m", dirfd == AT_FDCWD ? "" : "sub", path);
477
478 return dir;
479 }
480
481 static DIR* opendir_nomod(const char *path) {
482 return xopendirat_nomod(AT_FDCWD, path);
483 }
484
485 static int dir_cleanup(
486 Item *i,
487 const char *p,
488 DIR *d,
489 const struct stat *ds,
490 usec_t cutoff,
491 dev_t rootdev,
492 bool mountpoint,
493 int maxdepth,
494 bool keep_this_level) {
495
496 struct dirent *dent;
497 bool deleted = false;
498 int r = 0;
499
500 FOREACH_DIRENT_ALL(dent, d, break) {
501 struct stat s;
502 usec_t age;
503 _cleanup_free_ char *sub_path = NULL;
504
505 if (dot_or_dot_dot(dent->d_name))
506 continue;
507
508 if (fstatat(dirfd(d), dent->d_name, &s, AT_SYMLINK_NOFOLLOW) < 0) {
509 if (errno == ENOENT)
510 continue;
511
512 /* FUSE, NFS mounts, SELinux might return EACCES */
513 r = log_full_errno(errno == EACCES ? LOG_DEBUG : LOG_ERR, errno,
514 "stat(%s/%s) failed: %m", p, dent->d_name);
515 continue;
516 }
517
518 /* Stay on the same filesystem */
519 if (s.st_dev != rootdev) {
520 log_debug("Ignoring \"%s/%s\": different filesystem.", p, dent->d_name);
521 continue;
522 }
523
524 /* Try to detect bind mounts of the same filesystem instance; they
525 * do not differ in device major/minors. This type of query is not
526 * supported on all kernels or filesystem types though. */
527 if (S_ISDIR(s.st_mode)) {
528 int q;
529
530 q = fd_is_mount_point(dirfd(d), dent->d_name, 0);
531 if (q < 0)
532 log_debug_errno(q, "Failed to determine whether \"%s/%s\" is a mount point, ignoring: %m", p, dent->d_name);
533 else if (q > 0) {
534 log_debug("Ignoring \"%s/%s\": different mount of the same filesystem.", p, dent->d_name);
535 continue;
536 }
537 }
538
539 sub_path = path_join(p, dent->d_name);
540 if (!sub_path) {
541 r = log_oom();
542 goto finish;
543 }
544
545 /* Is there an item configured for this path? */
546 if (ordered_hashmap_get(items, sub_path)) {
547 log_debug("Ignoring \"%s\": a separate entry exists.", sub_path);
548 continue;
549 }
550
551 if (find_glob(globs, sub_path)) {
552 log_debug("Ignoring \"%s\": a separate glob exists.", sub_path);
553 continue;
554 }
555
556 if (S_ISDIR(s.st_mode)) {
557 _cleanup_closedir_ DIR *sub_dir = NULL;
558
559 if (mountpoint &&
560 streq(dent->d_name, "lost+found") &&
561 s.st_uid == 0) {
562 log_debug("Ignoring directory \"%s\".", sub_path);
563 continue;
564 }
565
566 if (maxdepth <= 0)
567 log_warning("Reached max depth on \"%s\".", sub_path);
568 else {
569 int q;
570
571 sub_dir = xopendirat_nomod(dirfd(d), dent->d_name);
572 if (!sub_dir) {
573 if (errno != ENOENT)
574 r = log_warning_errno(errno, "Opening directory \"%s\" failed, ignoring: %m", sub_path);
575
576 continue;
577 }
578
579 if (flock(dirfd(sub_dir), LOCK_EX|LOCK_NB) < 0) {
580 log_debug_errno(errno, "Couldn't acquire shared BSD lock on directory \"%s\", skipping: %m", p);
581 continue;
582 }
583
584 q = dir_cleanup(i, sub_path, sub_dir, &s, cutoff, rootdev, false, maxdepth-1, false);
585 if (q < 0)
586 r = q;
587 }
588
589 /* Note: if you are wondering why we don't support the sticky bit for excluding
590 * directories from cleaning like we do it for other file system objects: well, the
591 * sticky bit already has a meaning for directories, so we don't want to overload
592 * that. */
593
594 if (keep_this_level) {
595 log_debug("Keeping directory \"%s\".", sub_path);
596 continue;
597 }
598
599 /* Ignore ctime, we change it when deleting */
600 age = timespec_load(&s.st_mtim);
601 if (age >= cutoff) {
602 char a[FORMAT_TIMESTAMP_MAX];
603 /* Follows spelling in stat(1). */
604 log_debug("Directory \"%s\": modify time %s is too new.",
605 sub_path,
606 format_timestamp_us(a, sizeof(a), age));
607 continue;
608 }
609
610 age = timespec_load(&s.st_atim);
611 if (age >= cutoff) {
612 char a[FORMAT_TIMESTAMP_MAX];
613 log_debug("Directory \"%s\": access time %s is too new.",
614 sub_path,
615 format_timestamp_us(a, sizeof(a), age));
616 continue;
617 }
618
619 log_debug("Removing directory \"%s\".", sub_path);
620 if (unlinkat(dirfd(d), dent->d_name, AT_REMOVEDIR) < 0)
621 if (!IN_SET(errno, ENOENT, ENOTEMPTY))
622 r = log_warning_errno(errno, "Failed to remove directory \"%s\", ignoring: %m", sub_path);
623
624 } else {
625 /* Skip files for which the sticky bit is set. These are semantics we define, and are
626 * unknown elsewhere. See XDG_RUNTIME_DIR specification for details. */
627 if (s.st_mode & S_ISVTX) {
628 log_debug("Skipping \"%s\": sticky bit set.", sub_path);
629 continue;
630 }
631
632 if (mountpoint &&
633 S_ISREG(s.st_mode) &&
634 s.st_uid == 0 &&
635 STR_IN_SET(dent->d_name,
636 ".journal",
637 "aquota.user",
638 "aquota.group")) {
639 log_debug("Skipping \"%s\".", sub_path);
640 continue;
641 }
642
643 /* Ignore sockets that are listed in /proc/net/unix */
644 if (S_ISSOCK(s.st_mode) && unix_socket_alive(sub_path)) {
645 log_debug("Skipping \"%s\": live socket.", sub_path);
646 continue;
647 }
648
649 /* Ignore device nodes */
650 if (S_ISCHR(s.st_mode) || S_ISBLK(s.st_mode)) {
651 log_debug("Skipping \"%s\": a device.", sub_path);
652 continue;
653 }
654
655 /* Keep files on this level around if this is requested */
656 if (keep_this_level) {
657 log_debug("Keeping \"%s\".", sub_path);
658 continue;
659 }
660
661 age = timespec_load(&s.st_mtim);
662 if (age >= cutoff) {
663 char a[FORMAT_TIMESTAMP_MAX];
664 /* Follows spelling in stat(1). */
665 log_debug("File \"%s\": modify time %s is too new.",
666 sub_path,
667 format_timestamp_us(a, sizeof(a), age));
668 continue;
669 }
670
671 age = timespec_load(&s.st_atim);
672 if (age >= cutoff) {
673 char a[FORMAT_TIMESTAMP_MAX];
674 log_debug("File \"%s\": access time %s is too new.",
675 sub_path,
676 format_timestamp_us(a, sizeof(a), age));
677 continue;
678 }
679
680 age = timespec_load(&s.st_ctim);
681 if (age >= cutoff) {
682 char a[FORMAT_TIMESTAMP_MAX];
683 log_debug("File \"%s\": change time %s is too new.",
684 sub_path,
685 format_timestamp_us(a, sizeof(a), age));
686 continue;
687 }
688
689 log_debug("Removing \"%s\".", sub_path);
690 if (unlinkat(dirfd(d), dent->d_name, 0) < 0)
691 if (errno != ENOENT)
692 r = log_warning_errno(errno, "Failed to remove \"%s\", ignoring: %m", sub_path);
693
694 deleted = true;
695 }
696 }
697
698 finish:
699 if (deleted) {
700 char a[FORMAT_TIMESTAMP_MAX], b[FORMAT_TIMESTAMP_MAX];
701 usec_t age1, age2;
702
703 age1 = timespec_load(&ds->st_atim);
704 age2 = timespec_load(&ds->st_mtim);
705
706 log_debug("Restoring access and modification time on \"%s\": %s, %s",
707 p,
708 format_timestamp_us(a, sizeof(a), age1),
709 format_timestamp_us(b, sizeof(b), age2));
710
711 /* Restore original directory timestamps */
712 if (futimens(dirfd(d), (struct timespec[]) {
713 ds->st_atim,
714 ds->st_mtim }) < 0)
715 log_warning_errno(errno, "Failed to revert timestamps of '%s', ignoring: %m", p);
716 }
717
718 return r;
719 }
720
721 static bool dangerous_hardlinks(void) {
722 _cleanup_free_ char *value = NULL;
723 static int cached = -1;
724 int r;
725
726 /* Check whether the fs.protected_hardlinks sysctl is on. If we can't determine it we assume its off, as that's
727 * what the upstream default is. */
728
729 if (cached >= 0)
730 return cached;
731
732 r = read_one_line_file("/proc/sys/fs/protected_hardlinks", &value);
733 if (r < 0) {
734 log_debug_errno(r, "Failed to read fs.protected_hardlinks sysctl: %m");
735 return true;
736 }
737
738 r = parse_boolean(value);
739 if (r < 0) {
740 log_debug_errno(r, "Failed to parse fs.protected_hardlinks sysctl: %m");
741 return true;
742 }
743
744 cached = r == 0;
745 return cached;
746 }
747
748 static bool hardlink_vulnerable(const struct stat *st) {
749 assert(st);
750
751 return !S_ISDIR(st->st_mode) && st->st_nlink > 1 && dangerous_hardlinks();
752 }
753
754 static mode_t process_mask_perms(mode_t mode, mode_t current) {
755
756 if ((current & 0111) == 0)
757 mode &= ~0111;
758 if ((current & 0222) == 0)
759 mode &= ~0222;
760 if ((current & 0444) == 0)
761 mode &= ~0444;
762 if (!S_ISDIR(current))
763 mode &= ~07000; /* remove sticky/sgid/suid bit, unless directory */
764
765 return mode;
766 }
767
768 static int fd_set_perms(Item *i, int fd, const char *path, const struct stat *st) {
769 struct stat stbuf;
770 mode_t new_mode;
771 bool do_chown;
772
773 assert(i);
774 assert(fd);
775 assert(path);
776
777 if (!i->mode_set && !i->uid_set && !i->gid_set)
778 goto shortcut;
779
780 if (!st) {
781 if (fstat(fd, &stbuf) < 0)
782 return log_error_errno(errno, "fstat(%s) failed: %m", path);
783 st = &stbuf;
784 }
785
786 if (hardlink_vulnerable(st))
787 return log_error_errno(SYNTHETIC_ERRNO(EPERM),
788 "Refusing to set permissions on hardlinked file %s while the fs.protected_hardlinks sysctl is turned off.",
789 path);
790
791 /* Do we need a chown()? */
792 do_chown =
793 (i->uid_set && i->uid != st->st_uid) ||
794 (i->gid_set && i->gid != st->st_gid);
795
796 /* Calculate the mode to apply */
797 new_mode = i->mode_set ? (i->mask_perms ?
798 process_mask_perms(i->mode, st->st_mode) :
799 i->mode) :
800 (st->st_mode & 07777);
801
802 if (i->mode_set && do_chown) {
803 /* Before we issue the chmod() let's reduce the access mode to the common bits of the old and
804 * the new mode. That way there's no time window where the file exists under the old owner
805 * with more than the old access modes — and not under the new owner with more than the new
806 * access modes either. */
807
808 if (S_ISLNK(st->st_mode))
809 log_debug("Skipping temporary mode fix for symlink %s.", path);
810 else {
811 mode_t m = new_mode & st->st_mode; /* Mask new mode by old mode */
812
813 if (((m ^ st->st_mode) & 07777) == 0)
814 log_debug("\"%s\" matches temporary mode %o already.", path, m);
815 else {
816 log_debug("Temporarily changing \"%s\" to mode %o.", path, m);
817 if (fchmod_opath(fd, m) < 0)
818 return log_error_errno(errno, "fchmod() of %s failed: %m", path);
819 }
820 }
821 }
822
823 if (do_chown) {
824 log_debug("Changing \"%s\" to owner "UID_FMT":"GID_FMT,
825 path,
826 i->uid_set ? i->uid : UID_INVALID,
827 i->gid_set ? i->gid : GID_INVALID);
828
829 if (fchownat(fd,
830 "",
831 i->uid_set ? i->uid : UID_INVALID,
832 i->gid_set ? i->gid : GID_INVALID,
833 AT_EMPTY_PATH) < 0)
834 return log_error_errno(errno, "fchownat() of %s failed: %m", path);
835 }
836
837 /* Now, apply the final mode. We do this in two cases: when the user set a mode explicitly, or after a
838 * chown(), since chown()'s mangle the access mode in regards to sgid/suid in some conditions. */
839 if (i->mode_set || do_chown) {
840 if (S_ISLNK(st->st_mode))
841 log_debug("Skipping mode fix for symlink %s.", path);
842 else {
843 /* Check if the chmod() is unnecessary. Note that if we did a chown() before we always
844 * chmod() here again, since it might have mangled the bits. */
845 if (!do_chown && ((new_mode ^ st->st_mode) & 07777) == 0)
846 log_debug("\"%s\" matches mode %o already.", path, new_mode);
847 else {
848 log_debug("Changing \"%s\" to mode %o.", path, new_mode);
849 if (fchmod_opath(fd, new_mode) < 0)
850 return log_error_errno(errno, "fchmod() of %s failed: %m", path);
851 }
852 }
853 }
854
855 shortcut:
856 return label_fix(path, 0);
857 }
858
859 static int path_open_parent_safe(const char *path) {
860 _cleanup_free_ char *dn = NULL;
861 int r, fd;
862
863 if (path_equal(path, "/") || !path_is_normalized(path))
864 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
865 "Failed to open parent of '%s': invalid path.",
866 path);
867
868 dn = dirname_malloc(path);
869 if (!dn)
870 return log_oom();
871
872 r = chase_symlinks(dn, arg_root, CHASE_SAFE|CHASE_WARN, NULL, &fd);
873 if (r < 0 && r != -ENOLINK)
874 return log_error_errno(r, "Failed to validate path %s: %m", path);
875
876 return r < 0 ? r : fd;
877 }
878
879 static int path_open_safe(const char *path) {
880 int r, fd;
881
882 /* path_open_safe() returns a file descriptor opened with O_PATH after
883 * verifying that the path doesn't contain unsafe transitions, except
884 * for its final component as the function does not follow symlink. */
885
886 assert(path);
887
888 if (!path_is_normalized(path))
889 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
890 "Failed to open invalid path '%s'.",
891 path);
892
893 r = chase_symlinks(path, arg_root, CHASE_SAFE|CHASE_WARN|CHASE_NOFOLLOW, NULL, &fd);
894 if (r < 0 && r != -ENOLINK)
895 return log_error_errno(r, "Failed to validate path %s: %m", path);
896
897 return r < 0 ? r : fd;
898 }
899
900 static int path_set_perms(Item *i, const char *path) {
901 _cleanup_close_ int fd = -1;
902
903 assert(i);
904 assert(path);
905
906 fd = path_open_safe(path);
907 if (fd < 0)
908 return fd;
909
910 return fd_set_perms(i, fd, path, NULL);
911 }
912
913 static int parse_xattrs_from_arg(Item *i) {
914 const char *p;
915 int r;
916
917 assert(i);
918 assert(i->argument);
919
920 p = i->argument;
921
922 for (;;) {
923 _cleanup_free_ char *name = NULL, *value = NULL, *xattr = NULL;
924
925 r = extract_first_word(&p, &xattr, NULL, EXTRACT_UNQUOTE|EXTRACT_CUNESCAPE);
926 if (r < 0)
927 log_warning_errno(r, "Failed to parse extended attribute '%s', ignoring: %m", p);
928 if (r <= 0)
929 break;
930
931 r = split_pair(xattr, "=", &name, &value);
932 if (r < 0) {
933 log_warning_errno(r, "Failed to parse extended attribute, ignoring: %s", xattr);
934 continue;
935 }
936
937 if (isempty(name) || isempty(value)) {
938 log_warning("Malformed extended attribute found, ignoring: %s", xattr);
939 continue;
940 }
941
942 if (strv_push_pair(&i->xattrs, name, value) < 0)
943 return log_oom();
944
945 name = value = NULL;
946 }
947
948 return 0;
949 }
950
951 static int fd_set_xattrs(Item *i, int fd, const char *path, const struct stat *st) {
952 char procfs_path[STRLEN("/proc/self/fd/") + DECIMAL_STR_MAX(int)];
953 char **name, **value;
954
955 assert(i);
956 assert(fd);
957 assert(path);
958
959 xsprintf(procfs_path, "/proc/self/fd/%i", fd);
960
961 STRV_FOREACH_PAIR(name, value, i->xattrs) {
962 log_debug("Setting extended attribute '%s=%s' on %s.", *name, *value, path);
963 if (setxattr(procfs_path, *name, *value, strlen(*value), 0) < 0)
964 return log_error_errno(errno, "Setting extended attribute %s=%s on %s failed: %m",
965 *name, *value, path);
966 }
967 return 0;
968 }
969
970 static int path_set_xattrs(Item *i, const char *path) {
971 _cleanup_close_ int fd = -1;
972
973 assert(i);
974 assert(path);
975
976 fd = path_open_safe(path);
977 if (fd < 0)
978 return fd;
979
980 return fd_set_xattrs(i, fd, path, NULL);
981 }
982
983 static int parse_acls_from_arg(Item *item) {
984 #if HAVE_ACL
985 int r;
986
987 assert(item);
988
989 /* If append_or_force (= modify) is set, we will not modify the acl
990 * afterwards, so the mask can be added now if necessary. */
991
992 r = parse_acl(item->argument, &item->acl_access, &item->acl_default, !item->append_or_force);
993 if (r < 0)
994 log_warning_errno(r, "Failed to parse ACL \"%s\": %m. Ignoring", item->argument);
995 #else
996 log_warning_errno(SYNTHETIC_ERRNO(ENOSYS), "ACLs are not supported. Ignoring");
997 #endif
998
999 return 0;
1000 }
1001
1002 #if HAVE_ACL
1003 static int path_set_acl(const char *path, const char *pretty, acl_type_t type, acl_t acl, bool modify) {
1004 _cleanup_(acl_free_charpp) char *t = NULL;
1005 _cleanup_(acl_freep) acl_t dup = NULL;
1006 int r;
1007
1008 /* Returns 0 for success, positive error if already warned,
1009 * negative error otherwise. */
1010
1011 if (modify) {
1012 r = acls_for_file(path, type, acl, &dup);
1013 if (r < 0)
1014 return r;
1015
1016 r = calc_acl_mask_if_needed(&dup);
1017 if (r < 0)
1018 return r;
1019 } else {
1020 dup = acl_dup(acl);
1021 if (!dup)
1022 return -errno;
1023
1024 /* the mask was already added earlier if needed */
1025 }
1026
1027 r = add_base_acls_if_needed(&dup, path);
1028 if (r < 0)
1029 return r;
1030
1031 t = acl_to_any_text(dup, NULL, ',', TEXT_ABBREVIATE);
1032 log_debug("Setting %s ACL %s on %s.",
1033 type == ACL_TYPE_ACCESS ? "access" : "default",
1034 strna(t), pretty);
1035
1036 r = acl_set_file(path, type, dup);
1037 if (r < 0)
1038 /* Return positive to indicate we already warned */
1039 return -log_error_errno(errno,
1040 "Setting %s ACL \"%s\" on %s failed: %m",
1041 type == ACL_TYPE_ACCESS ? "access" : "default",
1042 strna(t), pretty);
1043
1044 return 0;
1045 }
1046 #endif
1047
1048 static int fd_set_acls(Item *item, int fd, const char *path, const struct stat *st) {
1049 int r = 0;
1050 #if HAVE_ACL
1051 char procfs_path[STRLEN("/proc/self/fd/") + DECIMAL_STR_MAX(int)];
1052 struct stat stbuf;
1053
1054 assert(item);
1055 assert(fd);
1056 assert(path);
1057
1058 if (!st) {
1059 if (fstat(fd, &stbuf) < 0)
1060 return log_error_errno(errno, "fstat(%s) failed: %m", path);
1061 st = &stbuf;
1062 }
1063
1064 if (hardlink_vulnerable(st))
1065 return log_error_errno(SYNTHETIC_ERRNO(EPERM),
1066 "Refusing to set ACLs on hardlinked file %s while the fs.protected_hardlinks sysctl is turned off.",
1067 path);
1068
1069 if (S_ISLNK(st->st_mode)) {
1070 log_debug("Skipping ACL fix for symlink %s.", path);
1071 return 0;
1072 }
1073
1074 xsprintf(procfs_path, "/proc/self/fd/%i", fd);
1075
1076 if (item->acl_access)
1077 r = path_set_acl(procfs_path, path, ACL_TYPE_ACCESS, item->acl_access, item->append_or_force);
1078
1079 /* set only default acls to folders */
1080 if (r == 0 && item->acl_default && S_ISDIR(st->st_mode))
1081 r = path_set_acl(procfs_path, path, ACL_TYPE_DEFAULT, item->acl_default, item->append_or_force);
1082
1083 if (r > 0)
1084 return -r; /* already warned */
1085 if (r == -EOPNOTSUPP) {
1086 log_debug_errno(r, "ACLs not supported by file system at %s", path);
1087 return 0;
1088 }
1089 if (r < 0)
1090 return log_error_errno(r, "ACL operation on \"%s\" failed: %m", path);
1091 #endif
1092 return r;
1093 }
1094
1095 static int path_set_acls(Item *item, const char *path) {
1096 int r = 0;
1097 #if HAVE_ACL
1098 _cleanup_close_ int fd = -1;
1099
1100 assert(item);
1101 assert(path);
1102
1103 fd = path_open_safe(path);
1104 if (fd < 0)
1105 return fd;
1106
1107 r = fd_set_acls(item, fd, path, NULL);
1108 #endif
1109 return r;
1110 }
1111
1112 static int parse_attribute_from_arg(Item *item) {
1113
1114 static const struct {
1115 char character;
1116 unsigned value;
1117 } attributes[] = {
1118 { 'A', FS_NOATIME_FL }, /* do not update atime */
1119 { 'S', FS_SYNC_FL }, /* Synchronous updates */
1120 { 'D', FS_DIRSYNC_FL }, /* dirsync behaviour (directories only) */
1121 { 'a', FS_APPEND_FL }, /* writes to file may only append */
1122 { 'c', FS_COMPR_FL }, /* Compress file */
1123 { 'd', FS_NODUMP_FL }, /* do not dump file */
1124 { 'e', FS_EXTENT_FL }, /* Extents */
1125 { 'i', FS_IMMUTABLE_FL }, /* Immutable file */
1126 { 'j', FS_JOURNAL_DATA_FL }, /* Reserved for ext3 */
1127 { 's', FS_SECRM_FL }, /* Secure deletion */
1128 { 'u', FS_UNRM_FL }, /* Undelete */
1129 { 't', FS_NOTAIL_FL }, /* file tail should not be merged */
1130 { 'T', FS_TOPDIR_FL }, /* Top of directory hierarchies */
1131 { 'C', FS_NOCOW_FL }, /* Do not cow file */
1132 { 'P', FS_PROJINHERIT_FL }, /* Inherit the quota project ID */
1133 };
1134
1135 enum {
1136 MODE_ADD,
1137 MODE_DEL,
1138 MODE_SET
1139 } mode = MODE_ADD;
1140
1141 unsigned value = 0, mask = 0;
1142 const char *p;
1143
1144 assert(item);
1145
1146 p = item->argument;
1147 if (p) {
1148 if (*p == '+') {
1149 mode = MODE_ADD;
1150 p++;
1151 } else if (*p == '-') {
1152 mode = MODE_DEL;
1153 p++;
1154 } else if (*p == '=') {
1155 mode = MODE_SET;
1156 p++;
1157 }
1158 }
1159
1160 if (isempty(p) && mode != MODE_SET)
1161 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
1162 "Setting file attribute on '%s' needs an attribute specification.",
1163 item->path);
1164
1165 for (; p && *p ; p++) {
1166 unsigned i, v;
1167
1168 for (i = 0; i < ELEMENTSOF(attributes); i++)
1169 if (*p == attributes[i].character)
1170 break;
1171
1172 if (i >= ELEMENTSOF(attributes))
1173 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
1174 "Unknown file attribute '%c' on '%s'.",
1175 *p, item->path);
1176
1177 v = attributes[i].value;
1178
1179 SET_FLAG(value, v, IN_SET(mode, MODE_ADD, MODE_SET));
1180
1181 mask |= v;
1182 }
1183
1184 if (mode == MODE_SET)
1185 mask |= CHATTR_ALL_FL;
1186
1187 assert(mask != 0);
1188
1189 item->attribute_mask = mask;
1190 item->attribute_value = value;
1191 item->attribute_set = true;
1192
1193 return 0;
1194 }
1195
1196 static int fd_set_attribute(Item *item, int fd, const char *path, const struct stat *st) {
1197 _cleanup_close_ int procfs_fd = -1;
1198 struct stat stbuf;
1199 unsigned f;
1200 int r;
1201
1202 assert(item);
1203 assert(fd);
1204 assert(path);
1205
1206 if (!item->attribute_set || item->attribute_mask == 0)
1207 return 0;
1208
1209 if (!st) {
1210 if (fstat(fd, &stbuf) < 0)
1211 return log_error_errno(errno, "fstat(%s) failed: %m", path);
1212 st = &stbuf;
1213 }
1214
1215 /* Issuing the file attribute ioctls on device nodes is not
1216 * safe, as that will be delivered to the drivers, not the
1217 * file system containing the device node. */
1218 if (!S_ISREG(st->st_mode) && !S_ISDIR(st->st_mode))
1219 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
1220 "Setting file flags is only supported on regular files and directories, cannot set on '%s'.",
1221 path);
1222
1223 f = item->attribute_value & item->attribute_mask;
1224
1225 /* Mask away directory-specific flags */
1226 if (!S_ISDIR(st->st_mode))
1227 f &= ~FS_DIRSYNC_FL;
1228
1229 procfs_fd = fd_reopen(fd, O_RDONLY|O_CLOEXEC|O_NOATIME);
1230 if (procfs_fd < 0)
1231 return log_error_errno(procfs_fd, "Failed to re-open '%s': %m", path);
1232
1233 r = chattr_fd(procfs_fd, f, item->attribute_mask, NULL);
1234 if (r < 0)
1235 log_full_errno(IN_SET(r, -ENOTTY, -EOPNOTSUPP) ? LOG_DEBUG : LOG_WARNING,
1236 r,
1237 "Cannot set file attribute for '%s', value=0x%08x, mask=0x%08x, ignoring: %m",
1238 path, item->attribute_value, item->attribute_mask);
1239
1240 return 0;
1241 }
1242
1243 static int path_set_attribute(Item *item, const char *path) {
1244 _cleanup_close_ int fd = -1;
1245
1246 if (!item->attribute_set || item->attribute_mask == 0)
1247 return 0;
1248
1249 fd = path_open_safe(path);
1250 if (fd < 0)
1251 return fd;
1252
1253 return fd_set_attribute(item, fd, path, NULL);
1254 }
1255
1256 static int write_one_file(Item *i, const char *path) {
1257 _cleanup_close_ int fd = -1, dir_fd = -1;
1258 char *bn;
1259 int flags, r;
1260
1261 assert(i);
1262 assert(path);
1263 assert(i->argument);
1264 assert(i->type == WRITE_FILE);
1265
1266 /* Validate the path and keep the fd on the directory for opening the
1267 * file so we're sure that it can't be changed behind our back. */
1268 dir_fd = path_open_parent_safe(path);
1269 if (dir_fd < 0)
1270 return dir_fd;
1271
1272 bn = basename(path);
1273
1274 flags = O_NONBLOCK|O_CLOEXEC|O_WRONLY|O_NOCTTY;
1275
1276 /* Follows symlinks */
1277 fd = openat(dir_fd, bn, i->append_or_force ? flags|O_APPEND : flags, i->mode);
1278 if (fd < 0) {
1279 if (errno == ENOENT) {
1280 log_debug_errno(errno, "Not writing missing file \"%s\": %m", path);
1281 return 0;
1282 }
1283 return log_error_errno(errno, "Failed to open file \"%s\": %m", path);
1284 }
1285
1286 /* 'w' is allowed to write into any kind of files. */
1287 log_debug("Writing to \"%s\".", path);
1288
1289 r = loop_write(fd, i->argument, strlen(i->argument), false);
1290 if (r < 0)
1291 return log_error_errno(r, "Failed to write file \"%s\": %m", path);
1292
1293 return fd_set_perms(i, fd, path, NULL);
1294 }
1295
1296 static int create_file(Item *i, const char *path) {
1297 _cleanup_close_ int fd = -1, dir_fd = -1;
1298 struct stat stbuf, *st = NULL;
1299 int r = 0;
1300 char *bn;
1301
1302 assert(i);
1303 assert(path);
1304 assert(i->type == CREATE_FILE);
1305
1306 /* 'f' operates on regular files exclusively. */
1307
1308 /* Validate the path and keep the fd on the directory for opening the
1309 * file so we're sure that it can't be changed behind our back. */
1310 dir_fd = path_open_parent_safe(path);
1311 if (dir_fd < 0)
1312 return dir_fd;
1313
1314 bn = basename(path);
1315
1316 RUN_WITH_UMASK(0000) {
1317 mac_selinux_create_file_prepare(path, S_IFREG);
1318 fd = openat(dir_fd, bn, O_CREAT|O_EXCL|O_NOFOLLOW|O_NONBLOCK|O_CLOEXEC|O_WRONLY|O_NOCTTY, i->mode);
1319 mac_selinux_create_file_clear();
1320 }
1321
1322 if (fd < 0) {
1323 /* Even on a read-only filesystem, open(2) returns EEXIST if the
1324 * file already exists. It returns EROFS only if it needs to
1325 * create the file. */
1326 if (errno != EEXIST)
1327 return log_error_errno(errno, "Failed to create file %s: %m", path);
1328
1329 /* Re-open the file. At that point it must exist since open(2)
1330 * failed with EEXIST. We still need to check if the perms/mode
1331 * need to be changed. For read-only filesystems, we let
1332 * fd_set_perms() report the error if the perms need to be
1333 * modified. */
1334 fd = openat(dir_fd, bn, O_NOFOLLOW|O_CLOEXEC|O_PATH, i->mode);
1335 if (fd < 0)
1336 return log_error_errno(errno, "Failed to re-open file %s: %m", path);
1337
1338 if (fstat(fd, &stbuf) < 0)
1339 return log_error_errno(errno, "stat(%s) failed: %m", path);
1340
1341 if (!S_ISREG(stbuf.st_mode)) {
1342 log_error("%s exists and is not a regular file.", path);
1343 return -EEXIST;
1344 }
1345
1346 st = &stbuf;
1347 } else {
1348
1349 log_debug("\"%s\" has been created.", path);
1350
1351 if (i->argument) {
1352 log_debug("Writing to \"%s\".", path);
1353
1354 r = loop_write(fd, i->argument, strlen(i->argument), false);
1355 if (r < 0)
1356 return log_error_errno(r, "Failed to write file \"%s\": %m", path);
1357 }
1358 }
1359
1360 return fd_set_perms(i, fd, path, st);
1361 }
1362
1363 static int truncate_file(Item *i, const char *path) {
1364 _cleanup_close_ int fd = -1, dir_fd = -1;
1365 struct stat stbuf, *st = NULL;
1366 bool erofs = false;
1367 int r = 0;
1368 char *bn;
1369
1370 assert(i);
1371 assert(path);
1372 assert(i->type == TRUNCATE_FILE);
1373
1374 /* We want to operate on regular file exclusively especially since
1375 * O_TRUNC is unspecified if the file is neither a regular file nor a
1376 * fifo nor a terminal device. Therefore we first open the file and make
1377 * sure it's a regular one before truncating it. */
1378
1379 /* Validate the path and keep the fd on the directory for opening the
1380 * file so we're sure that it can't be changed behind our back. */
1381 dir_fd = path_open_parent_safe(path);
1382 if (dir_fd < 0)
1383 return dir_fd;
1384
1385 bn = basename(path);
1386
1387 RUN_WITH_UMASK(0000) {
1388 mac_selinux_create_file_prepare(path, S_IFREG);
1389 fd = openat(dir_fd, bn, O_CREAT|O_NOFOLLOW|O_NONBLOCK|O_CLOEXEC|O_WRONLY|O_NOCTTY, i->mode);
1390 mac_selinux_create_file_clear();
1391 }
1392
1393 if (fd < 0) {
1394 if (errno != EROFS)
1395 return log_error_errno(errno, "Failed to open/create file %s: %m", path);
1396
1397 /* On a read-only filesystem, we don't want to fail if the
1398 * target is already empty and the perms are set. So we still
1399 * proceed with the sanity checks and let the remaining
1400 * operations fail with EROFS if they try to modify the target
1401 * file. */
1402
1403 fd = openat(dir_fd, bn, O_NOFOLLOW|O_CLOEXEC|O_PATH, i->mode);
1404 if (fd < 0) {
1405 if (errno == ENOENT) {
1406 log_error("Cannot create file %s on a read-only file system.", path);
1407 return -EROFS;
1408 }
1409
1410 return log_error_errno(errno, "Failed to re-open file %s: %m", path);
1411 }
1412
1413 erofs = true;
1414 }
1415
1416 if (fstat(fd, &stbuf) < 0)
1417 return log_error_errno(errno, "stat(%s) failed: %m", path);
1418
1419 if (!S_ISREG(stbuf.st_mode)) {
1420 log_error("%s exists and is not a regular file.", path);
1421 return -EEXIST;
1422 }
1423
1424 if (stbuf.st_size > 0) {
1425 if (ftruncate(fd, 0) < 0) {
1426 r = erofs ? -EROFS : -errno;
1427 return log_error_errno(r, "Failed to truncate file %s: %m", path);
1428 }
1429 } else
1430 st = &stbuf;
1431
1432 log_debug("\"%s\" has been created.", path);
1433
1434 if (i->argument) {
1435 log_debug("Writing to \"%s\".", path);
1436
1437 r = loop_write(fd, i->argument, strlen(i->argument), false);
1438 if (r < 0) {
1439 r = erofs ? -EROFS : r;
1440 return log_error_errno(r, "Failed to write file %s: %m", path);
1441 }
1442 }
1443
1444 return fd_set_perms(i, fd, path, st);
1445 }
1446
1447 static int copy_files(Item *i) {
1448 _cleanup_close_ int dfd = -1, fd = -1;
1449 char *bn;
1450 int r;
1451
1452 log_debug("Copying tree \"%s\" to \"%s\".", i->argument, i->path);
1453
1454 bn = basename(i->path);
1455
1456 /* Validate the path and use the returned directory fd for copying the
1457 * target so we're sure that the path can't be changed behind our
1458 * back. */
1459 dfd = path_open_parent_safe(i->path);
1460 if (dfd < 0)
1461 return dfd;
1462
1463 r = copy_tree_at(AT_FDCWD, i->argument,
1464 dfd, bn,
1465 i->uid_set ? i->uid : UID_INVALID,
1466 i->gid_set ? i->gid : GID_INVALID,
1467 COPY_REFLINK | COPY_MERGE_EMPTY);
1468 if (r < 0) {
1469 struct stat a, b;
1470
1471 /* If the target already exists on read-only filesystems, trying
1472 * to create the target will not fail with EEXIST but with
1473 * EROFS. */
1474 if (r == -EROFS && faccessat(dfd, bn, F_OK, AT_SYMLINK_NOFOLLOW) == 0)
1475 r = -EEXIST;
1476
1477 if (r != -EEXIST)
1478 return log_error_errno(r, "Failed to copy files to %s: %m", i->path);
1479
1480 if (stat(i->argument, &a) < 0)
1481 return log_error_errno(errno, "stat(%s) failed: %m", i->argument);
1482
1483 if (fstatat(dfd, bn, &b, AT_SYMLINK_NOFOLLOW) < 0)
1484 return log_error_errno(errno, "stat(%s) failed: %m", i->path);
1485
1486 if ((a.st_mode ^ b.st_mode) & S_IFMT) {
1487 log_debug("Can't copy to %s, file exists already and is of different type", i->path);
1488 return 0;
1489 }
1490 }
1491
1492 fd = openat(dfd, bn, O_NOFOLLOW|O_CLOEXEC|O_PATH);
1493 if (fd < 0)
1494 return log_error_errno(errno, "Failed to openat(%s): %m", i->path);
1495
1496 return fd_set_perms(i, fd, i->path, NULL);
1497 }
1498
1499 typedef enum {
1500 CREATION_NORMAL,
1501 CREATION_EXISTING,
1502 CREATION_FORCE,
1503 _CREATION_MODE_MAX,
1504 _CREATION_MODE_INVALID = -1
1505 } CreationMode;
1506
1507 static const char *const creation_mode_verb_table[_CREATION_MODE_MAX] = {
1508 [CREATION_NORMAL] = "Created",
1509 [CREATION_EXISTING] = "Found existing",
1510 [CREATION_FORCE] = "Created replacement",
1511 };
1512
1513 DEFINE_PRIVATE_STRING_TABLE_LOOKUP_TO_STRING(creation_mode_verb, CreationMode);
1514
1515 static int create_directory_or_subvolume(const char *path, mode_t mode, bool subvol, CreationMode *creation) {
1516 _cleanup_close_ int pfd = -1;
1517 CreationMode c;
1518 int r;
1519
1520 assert(path);
1521
1522 if (!creation)
1523 creation = &c;
1524
1525 pfd = path_open_parent_safe(path);
1526 if (pfd < 0)
1527 return pfd;
1528
1529 if (subvol) {
1530 if (btrfs_is_subvol(empty_to_root(arg_root)) <= 0)
1531
1532 /* Don't create a subvolume unless the root directory is
1533 * one, too. We do this under the assumption that if the
1534 * root directory is just a plain directory (i.e. very
1535 * light-weight), we shouldn't try to split it up into
1536 * subvolumes (i.e. more heavy-weight). Thus, chroot()
1537 * environments and suchlike will get a full brtfs
1538 * subvolume set up below their tree only if they
1539 * specifically set up a btrfs subvolume for the root
1540 * dir too. */
1541
1542 subvol = false;
1543 else {
1544 RUN_WITH_UMASK((~mode) & 0777)
1545 r = btrfs_subvol_make_fd(pfd, basename(path));
1546 }
1547 } else
1548 r = 0;
1549
1550 if (!subvol || r == -ENOTTY)
1551 RUN_WITH_UMASK(0000)
1552 r = mkdirat_label(pfd, basename(path), mode);
1553
1554 if (r < 0) {
1555 int k;
1556
1557 if (!IN_SET(r, -EEXIST, -EROFS))
1558 return log_error_errno(r, "Failed to create directory or subvolume \"%s\": %m", path);
1559
1560 k = is_dir_fd(pfd);
1561 if (k == -ENOENT && r == -EROFS)
1562 return log_error_errno(r, "%s does not exist and cannot be created as the file system is read-only.", path);
1563 if (k < 0)
1564 return log_error_errno(k, "Failed to check if %s exists: %m", path);
1565 if (!k) {
1566 log_warning("\"%s\" already exists and is not a directory.", path);
1567 return -EEXIST;
1568 }
1569
1570 *creation = CREATION_EXISTING;
1571 } else
1572 *creation = CREATION_NORMAL;
1573
1574 log_debug("%s directory \"%s\".", creation_mode_verb_to_string(*creation), path);
1575
1576 r = openat(pfd, basename(path), O_NOCTTY|O_CLOEXEC|O_DIRECTORY);
1577 if (r < 0)
1578 return log_error_errno(errno, "Failed to open directory '%s': %m", basename(path));
1579
1580 return r;
1581 }
1582
1583 static int create_directory(Item *i, const char *path) {
1584 _cleanup_close_ int fd = -1;
1585
1586 assert(i);
1587 assert(IN_SET(i->type, CREATE_DIRECTORY, TRUNCATE_DIRECTORY));
1588
1589 fd = create_directory_or_subvolume(path, i->mode, false, NULL);
1590 if (fd == -EEXIST)
1591 return 0;
1592 if (fd < 0)
1593 return fd;
1594
1595 return fd_set_perms(i, fd, path, NULL);
1596 }
1597
1598 static int create_subvolume(Item *i, const char *path) {
1599 _cleanup_close_ int fd = -1;
1600 CreationMode creation;
1601 int r, q = 0;
1602
1603 assert(i);
1604 assert(IN_SET(i->type, CREATE_SUBVOLUME, CREATE_SUBVOLUME_NEW_QUOTA, CREATE_SUBVOLUME_INHERIT_QUOTA));
1605
1606 fd = create_directory_or_subvolume(path, i->mode, true, &creation);
1607 if (fd == -EEXIST)
1608 return 0;
1609 if (fd < 0)
1610 return fd;
1611
1612 if (creation == CREATION_NORMAL &&
1613 IN_SET(i->type, CREATE_SUBVOLUME_NEW_QUOTA, CREATE_SUBVOLUME_INHERIT_QUOTA)) {
1614 r = btrfs_subvol_auto_qgroup_fd(fd, 0, i->type == CREATE_SUBVOLUME_NEW_QUOTA);
1615 if (r == -ENOTTY)
1616 log_debug_errno(r, "Couldn't adjust quota for subvolume \"%s\" (unsupported fs or dir not a subvolume): %m", i->path);
1617 else if (r == -EROFS)
1618 log_debug_errno(r, "Couldn't adjust quota for subvolume \"%s\" (fs is read-only).", i->path);
1619 else if (r == -ENOPROTOOPT)
1620 log_debug_errno(r, "Couldn't adjust quota for subvolume \"%s\" (quota support is disabled).", i->path);
1621 else if (r < 0)
1622 q = log_error_errno(r, "Failed to adjust quota for subvolume \"%s\": %m", i->path);
1623 else if (r > 0)
1624 log_debug("Adjusted quota for subvolume \"%s\".", i->path);
1625 else if (r == 0)
1626 log_debug("Quota for subvolume \"%s\" already in place, no change made.", i->path);
1627 }
1628
1629 r = fd_set_perms(i, fd, path, NULL);
1630 if (q < 0) /* prefer the quota change error from above */
1631 return q;
1632
1633 return r;
1634 }
1635
1636 static int empty_directory(Item *i, const char *path) {
1637 int r;
1638
1639 assert(i);
1640 assert(i->type == EMPTY_DIRECTORY);
1641
1642 r = is_dir(path, false);
1643 if (r == -ENOENT) {
1644 /* Option "e" operates only on existing objects. Do not
1645 * print errors about non-existent files or directories */
1646 log_debug("Skipping missing directory: %s", path);
1647 return 0;
1648 }
1649 if (r < 0)
1650 return log_error_errno(r, "is_dir() failed on path %s: %m", path);
1651 if (r == 0)
1652 return log_error_errno(SYNTHETIC_ERRNO(EEXIST),
1653 "'%s' already exists and is not a directory.",
1654 path);
1655
1656 return path_set_perms(i, path);
1657 }
1658
1659 static int create_device(Item *i, mode_t file_type) {
1660 _cleanup_close_ int dfd = -1, fd = -1;
1661 CreationMode creation;
1662 char *bn;
1663 int r;
1664
1665 assert(i);
1666 assert(IN_SET(file_type, S_IFBLK, S_IFCHR));
1667
1668 bn = basename(i->path);
1669
1670 /* Validate the path and use the returned directory fd for copying the
1671 * target so we're sure that the path can't be changed behind our
1672 * back. */
1673 dfd = path_open_parent_safe(i->path);
1674 if (dfd < 0)
1675 return dfd;
1676
1677 RUN_WITH_UMASK(0000) {
1678 mac_selinux_create_file_prepare(i->path, file_type);
1679 r = mknodat(dfd, bn, i->mode | file_type, i->major_minor);
1680 mac_selinux_create_file_clear();
1681 }
1682
1683 if (r < 0) {
1684 struct stat st;
1685
1686 if (errno == EPERM) {
1687 log_debug("We lack permissions, possibly because of cgroup configuration; "
1688 "skipping creation of device node %s.", i->path);
1689 return 0;
1690 }
1691
1692 if (errno != EEXIST)
1693 return log_error_errno(errno, "Failed to create device node %s: %m", i->path);
1694
1695 if (fstatat(dfd, bn, &st, 0) < 0)
1696 return log_error_errno(errno, "stat(%s) failed: %m", i->path);
1697
1698 if ((st.st_mode & S_IFMT) != file_type) {
1699
1700 if (i->append_or_force) {
1701
1702 RUN_WITH_UMASK(0000) {
1703 mac_selinux_create_file_prepare(i->path, file_type);
1704 /* FIXME: need to introduce mknodat_atomic() */
1705 r = mknod_atomic(i->path, i->mode | file_type, i->major_minor);
1706 mac_selinux_create_file_clear();
1707 }
1708
1709 if (r < 0)
1710 return log_error_errno(r, "Failed to create device node \"%s\": %m", i->path);
1711 creation = CREATION_FORCE;
1712 } else {
1713 log_debug("%s is not a device node.", i->path);
1714 return 0;
1715 }
1716 } else
1717 creation = CREATION_EXISTING;
1718 } else
1719 creation = CREATION_NORMAL;
1720
1721 log_debug("%s %s device node \"%s\" %u:%u.",
1722 creation_mode_verb_to_string(creation),
1723 i->type == CREATE_BLOCK_DEVICE ? "block" : "char",
1724 i->path, major(i->mode), minor(i->mode));
1725
1726 fd = openat(dfd, bn, O_NOFOLLOW|O_CLOEXEC|O_PATH);
1727 if (fd < 0)
1728 return log_error_errno(errno, "Failed to openat(%s): %m", i->path);
1729
1730 return fd_set_perms(i, fd, i->path, NULL);
1731 }
1732
1733 static int create_fifo(Item *i, const char *path) {
1734 _cleanup_close_ int pfd = -1, fd = -1;
1735 CreationMode creation;
1736 struct stat st;
1737 char *bn;
1738 int r;
1739
1740 pfd = path_open_parent_safe(path);
1741 if (pfd < 0)
1742 return pfd;
1743
1744 bn = basename(path);
1745
1746 RUN_WITH_UMASK(0000) {
1747 mac_selinux_create_file_prepare(path, S_IFIFO);
1748 r = mkfifoat(pfd, bn, i->mode);
1749 mac_selinux_create_file_clear();
1750 }
1751
1752 if (r < 0) {
1753 if (errno != EEXIST)
1754 return log_error_errno(errno, "Failed to create fifo %s: %m", path);
1755
1756 if (fstatat(pfd, bn, &st, AT_SYMLINK_NOFOLLOW) < 0)
1757 return log_error_errno(errno, "stat(%s) failed: %m", path);
1758
1759 if (!S_ISFIFO(st.st_mode)) {
1760
1761 if (i->append_or_force) {
1762 RUN_WITH_UMASK(0000) {
1763 mac_selinux_create_file_prepare(path, S_IFIFO);
1764 r = mkfifoat_atomic(pfd, bn, i->mode);
1765 mac_selinux_create_file_clear();
1766 }
1767
1768 if (r < 0)
1769 return log_error_errno(r, "Failed to create fifo %s: %m", path);
1770 creation = CREATION_FORCE;
1771 } else {
1772 log_warning("\"%s\" already exists and is not a fifo.", path);
1773 return 0;
1774 }
1775 } else
1776 creation = CREATION_EXISTING;
1777 } else
1778 creation = CREATION_NORMAL;
1779
1780 log_debug("%s fifo \"%s\".", creation_mode_verb_to_string(creation), path);
1781
1782 fd = openat(pfd, bn, O_NOFOLLOW|O_CLOEXEC|O_PATH);
1783 if (fd < 0)
1784 return log_error_errno(errno, "Failed to openat(%s): %m", path);
1785
1786 return fd_set_perms(i, fd, i->path, NULL);
1787 }
1788
1789 typedef int (*action_t)(Item *i, const char *path);
1790 typedef int (*fdaction_t)(Item *i, int fd, const char *path, const struct stat *st);
1791
1792 static int item_do(Item *i, int fd, const char *path, fdaction_t action) {
1793 struct stat st;
1794 int r = 0, q;
1795
1796 assert(i);
1797 assert(path);
1798 assert(fd >= 0);
1799
1800 if (fstat(fd, &st) < 0) {
1801 r = log_error_errno(errno, "fstat() on file failed: %m");
1802 goto finish;
1803 }
1804
1805 /* This returns the first error we run into, but nevertheless
1806 * tries to go on */
1807 r = action(i, fd, path, &st);
1808
1809 if (S_ISDIR(st.st_mode)) {
1810 char procfs_path[STRLEN("/proc/self/fd/") + DECIMAL_STR_MAX(int)];
1811 _cleanup_closedir_ DIR *d = NULL;
1812 struct dirent *de;
1813
1814 /* The passed 'fd' was opened with O_PATH. We need to convert
1815 * it into a 'regular' fd before reading the directory content. */
1816 xsprintf(procfs_path, "/proc/self/fd/%i", fd);
1817
1818 d = opendir(procfs_path);
1819 if (!d) {
1820 log_error_errno(errno, "Failed to opendir() '%s': %m", procfs_path);
1821 if (r == 0)
1822 r = -errno;
1823 goto finish;
1824 }
1825
1826 FOREACH_DIRENT_ALL(de, d, q = -errno; goto finish) {
1827 int de_fd;
1828
1829 if (dot_or_dot_dot(de->d_name))
1830 continue;
1831
1832 de_fd = openat(fd, de->d_name, O_NOFOLLOW|O_CLOEXEC|O_PATH);
1833 if (de_fd < 0)
1834 q = log_error_errno(errno, "Failed to open() file '%s': %m", de->d_name);
1835 else {
1836 _cleanup_free_ char *de_path = NULL;
1837
1838 de_path = path_join(path, de->d_name);
1839 if (!de_path)
1840 q = log_oom();
1841 else
1842 /* Pass ownership of dirent fd over */
1843 q = item_do(i, de_fd, de_path, action);
1844 }
1845
1846 if (q < 0 && r == 0)
1847 r = q;
1848 }
1849 }
1850 finish:
1851 safe_close(fd);
1852 return r;
1853 }
1854
1855 static int glob_item(Item *i, action_t action) {
1856 _cleanup_globfree_ glob_t g = {
1857 .gl_opendir = (void *(*)(const char *)) opendir_nomod,
1858 };
1859 int r = 0, k;
1860 char **fn;
1861
1862 k = safe_glob(i->path, GLOB_NOSORT|GLOB_BRACE, &g);
1863 if (k < 0 && k != -ENOENT)
1864 return log_error_errno(k, "glob(%s) failed: %m", i->path);
1865
1866 STRV_FOREACH(fn, g.gl_pathv) {
1867 k = action(i, *fn);
1868 if (k < 0 && r == 0)
1869 r = k;
1870 }
1871
1872 return r;
1873 }
1874
1875 static int glob_item_recursively(Item *i, fdaction_t action) {
1876 _cleanup_globfree_ glob_t g = {
1877 .gl_opendir = (void *(*)(const char *)) opendir_nomod,
1878 };
1879 int r = 0, k;
1880 char **fn;
1881
1882 k = safe_glob(i->path, GLOB_NOSORT|GLOB_BRACE, &g);
1883 if (k < 0 && k != -ENOENT)
1884 return log_error_errno(k, "glob(%s) failed: %m", i->path);
1885
1886 STRV_FOREACH(fn, g.gl_pathv) {
1887 _cleanup_close_ int fd = -1;
1888
1889 /* Make sure we won't trigger/follow file object (such as
1890 * device nodes, automounts, ...) pointed out by 'fn' with
1891 * O_PATH. Note, when O_PATH is used, flags other than
1892 * O_CLOEXEC, O_DIRECTORY, and O_NOFOLLOW are ignored. */
1893
1894 fd = open(*fn, O_CLOEXEC|O_NOFOLLOW|O_PATH);
1895 if (fd < 0) {
1896 log_error_errno(errno, "Opening '%s' failed: %m", *fn);
1897 if (r == 0)
1898 r = -errno;
1899 continue;
1900 }
1901
1902 k = item_do(i, fd, *fn, action);
1903 if (k < 0 && r == 0)
1904 r = k;
1905
1906 /* we passed fd ownership to the previous call */
1907 fd = -1;
1908 }
1909
1910 return r;
1911 }
1912
1913 static int create_item(Item *i) {
1914 CreationMode creation;
1915 int r = 0;
1916
1917 assert(i);
1918
1919 log_debug("Running create action for entry %c %s", (char) i->type, i->path);
1920
1921 switch (i->type) {
1922
1923 case IGNORE_PATH:
1924 case IGNORE_DIRECTORY_PATH:
1925 case REMOVE_PATH:
1926 case RECURSIVE_REMOVE_PATH:
1927 return 0;
1928
1929 case CREATE_FILE:
1930 RUN_WITH_UMASK(0000)
1931 (void) mkdir_parents_label(i->path, 0755);
1932
1933 r = create_file(i, i->path);
1934 if (r < 0)
1935 return r;
1936 break;
1937
1938 case TRUNCATE_FILE:
1939 RUN_WITH_UMASK(0000)
1940 (void) mkdir_parents_label(i->path, 0755);
1941
1942 r = truncate_file(i, i->path);
1943 if (r < 0)
1944 return r;
1945 break;
1946
1947 case COPY_FILES:
1948 RUN_WITH_UMASK(0000)
1949 (void) mkdir_parents_label(i->path, 0755);
1950
1951 r = copy_files(i);
1952 if (r < 0)
1953 return r;
1954 break;
1955
1956 case WRITE_FILE:
1957 r = glob_item(i, write_one_file);
1958 if (r < 0)
1959 return r;
1960
1961 break;
1962
1963 case CREATE_DIRECTORY:
1964 case TRUNCATE_DIRECTORY:
1965 RUN_WITH_UMASK(0000)
1966 (void) mkdir_parents_label(i->path, 0755);
1967
1968 r = create_directory(i, i->path);
1969 if (r < 0)
1970 return r;
1971 break;
1972
1973 case CREATE_SUBVOLUME:
1974 case CREATE_SUBVOLUME_INHERIT_QUOTA:
1975 case CREATE_SUBVOLUME_NEW_QUOTA:
1976 RUN_WITH_UMASK(0000)
1977 (void) mkdir_parents_label(i->path, 0755);
1978
1979 r = create_subvolume(i, i->path);
1980 if (r < 0)
1981 return r;
1982 break;
1983
1984 case EMPTY_DIRECTORY:
1985 r = glob_item(i, empty_directory);
1986 if (r < 0)
1987 return r;
1988 break;
1989
1990 case CREATE_FIFO:
1991 RUN_WITH_UMASK(0000)
1992 (void) mkdir_parents_label(i->path, 0755);
1993
1994 r = create_fifo(i, i->path);
1995 if (r < 0)
1996 return r;
1997 break;
1998
1999 case CREATE_SYMLINK: {
2000 RUN_WITH_UMASK(0000)
2001 (void) mkdir_parents_label(i->path, 0755);
2002
2003 mac_selinux_create_file_prepare(i->path, S_IFLNK);
2004 r = symlink(i->argument, i->path);
2005 mac_selinux_create_file_clear();
2006
2007 if (r < 0) {
2008 _cleanup_free_ char *x = NULL;
2009
2010 if (errno != EEXIST)
2011 return log_error_errno(errno, "symlink(%s, %s) failed: %m", i->argument, i->path);
2012
2013 r = readlink_malloc(i->path, &x);
2014 if (r < 0 || !streq(i->argument, x)) {
2015
2016 if (i->append_or_force) {
2017 mac_selinux_create_file_prepare(i->path, S_IFLNK);
2018 r = symlink_atomic(i->argument, i->path);
2019 mac_selinux_create_file_clear();
2020
2021 if (IN_SET(r, -EISDIR, -EEXIST, -ENOTEMPTY)) {
2022 r = rm_rf(i->path, REMOVE_ROOT|REMOVE_PHYSICAL);
2023 if (r < 0)
2024 return log_error_errno(r, "rm -fr %s failed: %m", i->path);
2025
2026 mac_selinux_create_file_prepare(i->path, S_IFLNK);
2027 r = symlink(i->argument, i->path) < 0 ? -errno : 0;
2028 mac_selinux_create_file_clear();
2029 }
2030 if (r < 0)
2031 return log_error_errno(r, "symlink(%s, %s) failed: %m", i->argument, i->path);
2032
2033 creation = CREATION_FORCE;
2034 } else {
2035 log_debug("\"%s\" is not a symlink or does not point to the correct path.", i->path);
2036 return 0;
2037 }
2038 } else
2039 creation = CREATION_EXISTING;
2040 } else
2041
2042 creation = CREATION_NORMAL;
2043 log_debug("%s symlink \"%s\".", creation_mode_verb_to_string(creation), i->path);
2044 break;
2045 }
2046
2047 case CREATE_BLOCK_DEVICE:
2048 case CREATE_CHAR_DEVICE:
2049 if (have_effective_cap(CAP_MKNOD) == 0) {
2050 /* In a container we lack CAP_MKNOD. We shouldn't attempt to create the device node in that
2051 * case to avoid noise, and we don't support virtualized devices in containers anyway. */
2052
2053 log_debug("We lack CAP_MKNOD, skipping creation of device node %s.", i->path);
2054 return 0;
2055 }
2056
2057 RUN_WITH_UMASK(0000)
2058 (void) mkdir_parents_label(i->path, 0755);
2059
2060 r = create_device(i, i->type == CREATE_BLOCK_DEVICE ? S_IFBLK : S_IFCHR);
2061 if (r < 0)
2062 return r;
2063
2064 break;
2065
2066 case ADJUST_MODE:
2067 case RELABEL_PATH:
2068 r = glob_item(i, path_set_perms);
2069 if (r < 0)
2070 return r;
2071 break;
2072
2073 case RECURSIVE_RELABEL_PATH:
2074 r = glob_item_recursively(i, fd_set_perms);
2075 if (r < 0)
2076 return r;
2077 break;
2078
2079 case SET_XATTR:
2080 r = glob_item(i, path_set_xattrs);
2081 if (r < 0)
2082 return r;
2083 break;
2084
2085 case RECURSIVE_SET_XATTR:
2086 r = glob_item_recursively(i, fd_set_xattrs);
2087 if (r < 0)
2088 return r;
2089 break;
2090
2091 case SET_ACL:
2092 r = glob_item(i, path_set_acls);
2093 if (r < 0)
2094 return r;
2095 break;
2096
2097 case RECURSIVE_SET_ACL:
2098 r = glob_item_recursively(i, fd_set_acls);
2099 if (r < 0)
2100 return r;
2101 break;
2102
2103 case SET_ATTRIBUTE:
2104 r = glob_item(i, path_set_attribute);
2105 if (r < 0)
2106 return r;
2107 break;
2108
2109 case RECURSIVE_SET_ATTRIBUTE:
2110 r = glob_item_recursively(i, fd_set_attribute);
2111 if (r < 0)
2112 return r;
2113 break;
2114 }
2115
2116 return 0;
2117 }
2118
2119 static int remove_item_instance(Item *i, const char *instance) {
2120 int r;
2121
2122 assert(i);
2123
2124 switch (i->type) {
2125
2126 case REMOVE_PATH:
2127 if (remove(instance) < 0 && errno != ENOENT)
2128 return log_error_errno(errno, "rm(%s): %m", instance);
2129
2130 break;
2131
2132 case RECURSIVE_REMOVE_PATH:
2133 /* FIXME: we probably should use dir_cleanup() here instead of rm_rf() so that 'x' is honoured. */
2134 log_debug("rm -rf \"%s\"", instance);
2135 r = rm_rf(instance, REMOVE_ROOT|REMOVE_SUBVOLUME|REMOVE_PHYSICAL);
2136 if (r < 0 && r != -ENOENT)
2137 return log_error_errno(r, "rm_rf(%s): %m", instance);
2138
2139 break;
2140
2141 default:
2142 assert_not_reached("wut?");
2143 }
2144
2145 return 0;
2146 }
2147
2148 static int remove_item(Item *i) {
2149 int r;
2150
2151 assert(i);
2152
2153 log_debug("Running remove action for entry %c %s", (char) i->type, i->path);
2154
2155 switch (i->type) {
2156
2157 case TRUNCATE_DIRECTORY:
2158 /* FIXME: we probably should use dir_cleanup() here instead of rm_rf() so that 'x' is honoured. */
2159 log_debug("rm -rf \"%s\"", i->path);
2160 r = rm_rf(i->path, REMOVE_PHYSICAL);
2161 if (r < 0 && r != -ENOENT)
2162 return log_error_errno(r, "rm_rf(%s): %m", i->path);
2163
2164 return 0;
2165
2166 case REMOVE_PATH:
2167 case RECURSIVE_REMOVE_PATH:
2168 return glob_item(i, remove_item_instance);
2169
2170 default:
2171 return 0;
2172 }
2173 }
2174
2175 static int clean_item_instance(Item *i, const char* instance) {
2176 _cleanup_closedir_ DIR *d = NULL;
2177 struct stat s, ps;
2178 bool mountpoint;
2179 usec_t cutoff, n;
2180 char timestamp[FORMAT_TIMESTAMP_MAX];
2181
2182 assert(i);
2183
2184 if (!i->age_set)
2185 return 0;
2186
2187 n = now(CLOCK_REALTIME);
2188 if (n < i->age)
2189 return 0;
2190
2191 cutoff = n - i->age;
2192
2193 d = opendir_nomod(instance);
2194 if (!d) {
2195 if (IN_SET(errno, ENOENT, ENOTDIR)) {
2196 log_debug_errno(errno, "Directory \"%s\": %m", instance);
2197 return 0;
2198 }
2199
2200 return log_error_errno(errno, "Failed to open directory %s: %m", instance);
2201 }
2202
2203 if (fstat(dirfd(d), &s) < 0)
2204 return log_error_errno(errno, "stat(%s) failed: %m", i->path);
2205
2206 if (!S_ISDIR(s.st_mode))
2207 return log_error_errno(SYNTHETIC_ERRNO(ENOTDIR),
2208 "%s is not a directory.", i->path);
2209
2210 if (fstatat(dirfd(d), "..", &ps, AT_SYMLINK_NOFOLLOW) != 0)
2211 return log_error_errno(errno, "stat(%s/..) failed: %m", i->path);
2212
2213 mountpoint = s.st_dev != ps.st_dev || s.st_ino == ps.st_ino;
2214
2215 log_debug("Cleanup threshold for %s \"%s\" is %s",
2216 mountpoint ? "mount point" : "directory",
2217 instance,
2218 format_timestamp_us(timestamp, sizeof(timestamp), cutoff));
2219
2220 return dir_cleanup(i, instance, d, &s, cutoff, s.st_dev, mountpoint,
2221 MAX_DEPTH, i->keep_first_level);
2222 }
2223
2224 static int clean_item(Item *i) {
2225 assert(i);
2226
2227 log_debug("Running clean action for entry %c %s", (char) i->type, i->path);
2228
2229 switch (i->type) {
2230 case CREATE_DIRECTORY:
2231 case CREATE_SUBVOLUME:
2232 case CREATE_SUBVOLUME_INHERIT_QUOTA:
2233 case CREATE_SUBVOLUME_NEW_QUOTA:
2234 case TRUNCATE_DIRECTORY:
2235 case IGNORE_PATH:
2236 case COPY_FILES:
2237 clean_item_instance(i, i->path);
2238 return 0;
2239 case EMPTY_DIRECTORY:
2240 case IGNORE_DIRECTORY_PATH:
2241 return glob_item(i, clean_item_instance);
2242 default:
2243 return 0;
2244 }
2245 }
2246
2247 static int process_item(Item *i, OperationMask operation) {
2248 OperationMask todo;
2249 int r, q, p;
2250
2251 assert(i);
2252
2253 todo = operation & ~i->done;
2254 if (todo == 0) /* Everything already done? */
2255 return 0;
2256
2257 i->done |= operation;
2258
2259 r = chase_symlinks(i->path, arg_root, CHASE_NO_AUTOFS|CHASE_WARN, NULL, NULL);
2260 if (r == -EREMOTE) {
2261 log_notice_errno(r, "Skipping %s", i->path);
2262 return 0;
2263 }
2264 if (r < 0)
2265 log_debug_errno(r, "Failed to determine whether '%s' is below autofs, ignoring: %m", i->path);
2266
2267 r = FLAGS_SET(operation, OPERATION_CREATE) ? create_item(i) : 0;
2268 /* Failure can only be tolerated for create */
2269 if (i->allow_failure)
2270 r = 0;
2271
2272 q = FLAGS_SET(operation, OPERATION_REMOVE) ? remove_item(i) : 0;
2273 p = FLAGS_SET(operation, OPERATION_CLEAN) ? clean_item(i) : 0;
2274
2275 return r < 0 ? r :
2276 q < 0 ? q :
2277 p;
2278 }
2279
2280 static int process_item_array(ItemArray *array, OperationMask operation) {
2281 int r = 0;
2282 size_t n;
2283
2284 assert(array);
2285
2286 /* Create any parent first. */
2287 if (FLAGS_SET(operation, OPERATION_CREATE) && array->parent)
2288 r = process_item_array(array->parent, operation & OPERATION_CREATE);
2289
2290 /* Clean up all children first */
2291 if ((operation & (OPERATION_REMOVE|OPERATION_CLEAN)) && !set_isempty(array->children)) {
2292 Iterator i;
2293 ItemArray *c;
2294
2295 SET_FOREACH(c, array->children, i) {
2296 int k;
2297
2298 k = process_item_array(c, operation & (OPERATION_REMOVE|OPERATION_CLEAN));
2299 if (k < 0 && r == 0)
2300 r = k;
2301 }
2302 }
2303
2304 for (n = 0; n < array->n_items; n++) {
2305 int k;
2306
2307 k = process_item(array->items + n, operation);
2308 if (k < 0 && r == 0)
2309 r = k;
2310 }
2311
2312 return r;
2313 }
2314
2315 static void item_free_contents(Item *i) {
2316 assert(i);
2317 free(i->path);
2318 free(i->argument);
2319 strv_free(i->xattrs);
2320
2321 #if HAVE_ACL
2322 acl_free(i->acl_access);
2323 acl_free(i->acl_default);
2324 #endif
2325 }
2326
2327 static ItemArray* item_array_free(ItemArray *a) {
2328 size_t n;
2329
2330 if (!a)
2331 return NULL;
2332
2333 for (n = 0; n < a->n_items; n++)
2334 item_free_contents(a->items + n);
2335
2336 set_free(a->children);
2337 free(a->items);
2338 return mfree(a);
2339 }
2340
2341 static int item_compare(const Item *a, const Item *b) {
2342 /* Make sure that the ownership taking item is put first, so
2343 * that we first create the node, and then can adjust it */
2344
2345 if (takes_ownership(a->type) && !takes_ownership(b->type))
2346 return -1;
2347 if (!takes_ownership(a->type) && takes_ownership(b->type))
2348 return 1;
2349
2350 return CMP(a->type, b->type);
2351 }
2352
2353 static bool item_compatible(Item *a, Item *b) {
2354 assert(a);
2355 assert(b);
2356 assert(streq(a->path, b->path));
2357
2358 if (takes_ownership(a->type) && takes_ownership(b->type))
2359 /* check if the items are the same */
2360 return streq_ptr(a->argument, b->argument) &&
2361
2362 a->uid_set == b->uid_set &&
2363 a->uid == b->uid &&
2364
2365 a->gid_set == b->gid_set &&
2366 a->gid == b->gid &&
2367
2368 a->mode_set == b->mode_set &&
2369 a->mode == b->mode &&
2370
2371 a->age_set == b->age_set &&
2372 a->age == b->age &&
2373
2374 a->mask_perms == b->mask_perms &&
2375
2376 a->keep_first_level == b->keep_first_level &&
2377
2378 a->major_minor == b->major_minor;
2379
2380 return true;
2381 }
2382
2383 static bool should_include_path(const char *path) {
2384 char **prefix;
2385
2386 STRV_FOREACH(prefix, arg_exclude_prefixes)
2387 if (path_startswith(path, *prefix)) {
2388 log_debug("Entry \"%s\" matches exclude prefix \"%s\", skipping.",
2389 path, *prefix);
2390 return false;
2391 }
2392
2393 STRV_FOREACH(prefix, arg_include_prefixes)
2394 if (path_startswith(path, *prefix)) {
2395 log_debug("Entry \"%s\" matches include prefix \"%s\".", path, *prefix);
2396 return true;
2397 }
2398
2399 /* no matches, so we should include this path only if we
2400 * have no whitelist at all */
2401 if (strv_isempty(arg_include_prefixes))
2402 return true;
2403
2404 log_debug("Entry \"%s\" does not match any include prefix, skipping.", path);
2405 return false;
2406 }
2407
2408 static int specifier_expansion_from_arg(Item *i) {
2409 _cleanup_free_ char *unescaped = NULL, *resolved = NULL;
2410 char **xattr;
2411 int r;
2412
2413 assert(i);
2414
2415 if (!i->argument)
2416 return 0;
2417
2418 switch (i->type) {
2419 case COPY_FILES:
2420 case CREATE_SYMLINK:
2421 case CREATE_FILE:
2422 case TRUNCATE_FILE:
2423 case WRITE_FILE:
2424 r = cunescape(i->argument, 0, &unescaped);
2425 if (r < 0)
2426 return log_error_errno(r, "Failed to unescape parameter to write: %s", i->argument);
2427
2428 r = specifier_printf(unescaped, specifier_table, NULL, &resolved);
2429 if (r < 0)
2430 return r;
2431
2432 free_and_replace(i->argument, resolved);
2433 break;
2434
2435 case SET_XATTR:
2436 case RECURSIVE_SET_XATTR:
2437 assert(i->xattrs);
2438
2439 STRV_FOREACH (xattr, i->xattrs) {
2440 r = specifier_printf(*xattr, specifier_table, NULL, &resolved);
2441 if (r < 0)
2442 return r;
2443
2444 free_and_replace(*xattr, resolved);
2445 }
2446 break;
2447
2448 default:
2449 break;
2450 }
2451 return 0;
2452 }
2453
2454 static int patch_var_run(const char *fname, unsigned line, char **path) {
2455 const char *k;
2456 char *n;
2457
2458 assert(path);
2459 assert(*path);
2460
2461 /* Optionally rewrites lines referencing /var/run/, to use /run/ instead. Why bother? tmpfiles merges lines in
2462 * some cases and detects conflicts in others. If files/directories are specified through two equivalent lines
2463 * this is problematic as neither case will be detected. Ideally we'd detect these cases by resolving symlinks
2464 * early, but that's precisely not what we can do here as this code very likely is running very early on, at a
2465 * time where the paths in question are not available yet, or even more importantly, our own tmpfiles rules
2466 * might create the paths that are intermediary to the listed paths. We can't really cover the generic case,
2467 * but the least we can do is cover the specific case of /var/run vs. /run, as /var/run is a legacy name for
2468 * /run only, and we explicitly document that and require that on systemd systems the former is a symlink to
2469 * the latter. Moreover files below this path are by far the primary usecase for tmpfiles.d/. */
2470
2471 k = path_startswith(*path, "/var/run/");
2472 if (isempty(k)) /* Don't complain about other paths than /var/run, and not about /var/run itself either. */
2473 return 0;
2474
2475 n = path_join("/run", k);
2476 if (!n)
2477 return log_oom();
2478
2479 /* Also log about this briefly. We do so at LOG_NOTICE level, as we fixed up the situation automatically, hence
2480 * there's no immediate need for action by the user. However, in the interest of making things less confusing
2481 * to the user, let's still inform the user that these snippets should really be updated. */
2482 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);
2483
2484 free_and_replace(*path, n);
2485
2486 return 0;
2487 }
2488
2489 static int parse_line(const char *fname, unsigned line, const char *buffer, bool *invalid_config) {
2490
2491 _cleanup_free_ char *action = NULL, *mode = NULL, *user = NULL, *group = NULL, *age = NULL, *path = NULL;
2492 _cleanup_(item_free_contents) Item i = {};
2493 ItemArray *existing;
2494 OrderedHashmap *h;
2495 int r, pos;
2496 bool append_or_force = false, boot = false, allow_failure = false;
2497
2498 assert(fname);
2499 assert(line >= 1);
2500 assert(buffer);
2501
2502 r = extract_many_words(
2503 &buffer,
2504 NULL,
2505 EXTRACT_UNQUOTE,
2506 &action,
2507 &path,
2508 &mode,
2509 &user,
2510 &group,
2511 &age,
2512 NULL);
2513 if (r < 0) {
2514 if (IN_SET(r, -EINVAL, -EBADSLT))
2515 /* invalid quoting and such or an unknown specifier */
2516 *invalid_config = true;
2517 return log_error_errno(r, "[%s:%u] Failed to parse line: %m", fname, line);
2518 } else if (r < 2) {
2519 *invalid_config = true;
2520 log_error("[%s:%u] Syntax error.", fname, line);
2521 return -EIO;
2522 }
2523
2524 if (!empty_or_dash(buffer)) {
2525 i.argument = strdup(buffer);
2526 if (!i.argument)
2527 return log_oom();
2528 }
2529
2530 if (isempty(action)) {
2531 *invalid_config = true;
2532 log_error("[%s:%u] Command too short '%s'.", fname, line, action);
2533 return -EINVAL;
2534 }
2535
2536 for (pos = 1; action[pos]; pos++) {
2537 if (action[pos] == '!' && !boot)
2538 boot = true;
2539 else if (action[pos] == '+' && !append_or_force)
2540 append_or_force = true;
2541 else if (action[pos] == '-' && !allow_failure)
2542 allow_failure = true;
2543 else {
2544 *invalid_config = true;
2545 log_error("[%s:%u] Unknown modifiers in command '%s'",
2546 fname, line, action);
2547 return -EINVAL;
2548 }
2549 }
2550
2551 if (boot && !arg_boot) {
2552 log_debug("Ignoring entry %s \"%s\" because --boot is not specified.",
2553 action, path);
2554 return 0;
2555 }
2556
2557 i.type = action[0];
2558 i.append_or_force = append_or_force;
2559 i.allow_failure = allow_failure;
2560
2561 r = specifier_printf(path, specifier_table, NULL, &i.path);
2562 if (r == -ENXIO)
2563 return log_unresolvable_specifier(fname, line);
2564 if (r < 0) {
2565 if (IN_SET(r, -EINVAL, -EBADSLT))
2566 *invalid_config = true;
2567 return log_error_errno(r, "[%s:%u] Failed to replace specifiers: %s", fname, line, path);
2568 }
2569
2570 r = patch_var_run(fname, line, &i.path);
2571 if (r < 0)
2572 return r;
2573
2574 switch (i.type) {
2575
2576 case CREATE_DIRECTORY:
2577 case CREATE_SUBVOLUME:
2578 case CREATE_SUBVOLUME_INHERIT_QUOTA:
2579 case CREATE_SUBVOLUME_NEW_QUOTA:
2580 case EMPTY_DIRECTORY:
2581 case TRUNCATE_DIRECTORY:
2582 case CREATE_FIFO:
2583 case IGNORE_PATH:
2584 case IGNORE_DIRECTORY_PATH:
2585 case REMOVE_PATH:
2586 case RECURSIVE_REMOVE_PATH:
2587 case ADJUST_MODE:
2588 case RELABEL_PATH:
2589 case RECURSIVE_RELABEL_PATH:
2590 if (i.argument)
2591 log_warning("[%s:%u] %c lines don't take argument fields, ignoring.", fname, line, i.type);
2592
2593 break;
2594
2595 case CREATE_FILE:
2596 case TRUNCATE_FILE:
2597 break;
2598
2599 case CREATE_SYMLINK:
2600 if (!i.argument) {
2601 i.argument = path_join("/usr/share/factory", i.path);
2602 if (!i.argument)
2603 return log_oom();
2604 }
2605 break;
2606
2607 case WRITE_FILE:
2608 if (!i.argument) {
2609 *invalid_config = true;
2610 log_error("[%s:%u] Write file requires argument.", fname, line);
2611 return -EBADMSG;
2612 }
2613 break;
2614
2615 case COPY_FILES:
2616 if (!i.argument) {
2617 i.argument = path_join(arg_root, "/usr/share/factory", i.path);
2618 if (!i.argument)
2619 return log_oom();
2620
2621 } else if (!path_is_absolute(i.argument)) {
2622 *invalid_config = true;
2623 log_error("[%s:%u] Source path is not absolute.", fname, line);
2624 return -EBADMSG;
2625
2626 } else if (arg_root) {
2627 char *p;
2628
2629 p = path_join(arg_root, i.argument);
2630 if (!p)
2631 return log_oom();
2632 free_and_replace(i.argument, p);
2633 }
2634
2635 path_simplify(i.argument, false);
2636 break;
2637
2638 case CREATE_CHAR_DEVICE:
2639 case CREATE_BLOCK_DEVICE:
2640 if (!i.argument) {
2641 *invalid_config = true;
2642 log_error("[%s:%u] Device file requires argument.", fname, line);
2643 return -EBADMSG;
2644 }
2645
2646 r = parse_dev(i.argument, &i.major_minor);
2647 if (r < 0) {
2648 *invalid_config = true;
2649 log_error_errno(r, "[%s:%u] Can't parse device file major/minor '%s'.", fname, line, i.argument);
2650 return -EBADMSG;
2651 }
2652
2653 break;
2654
2655 case SET_XATTR:
2656 case RECURSIVE_SET_XATTR:
2657 if (!i.argument) {
2658 *invalid_config = true;
2659 log_error("[%s:%u] Set extended attribute requires argument.", fname, line);
2660 return -EBADMSG;
2661 }
2662 r = parse_xattrs_from_arg(&i);
2663 if (r < 0)
2664 return r;
2665 break;
2666
2667 case SET_ACL:
2668 case RECURSIVE_SET_ACL:
2669 if (!i.argument) {
2670 *invalid_config = true;
2671 log_error("[%s:%u] Set ACLs requires argument.", fname, line);
2672 return -EBADMSG;
2673 }
2674 r = parse_acls_from_arg(&i);
2675 if (r < 0)
2676 return r;
2677 break;
2678
2679 case SET_ATTRIBUTE:
2680 case RECURSIVE_SET_ATTRIBUTE:
2681 if (!i.argument) {
2682 *invalid_config = true;
2683 log_error("[%s:%u] Set file attribute requires argument.", fname, line);
2684 return -EBADMSG;
2685 }
2686 r = parse_attribute_from_arg(&i);
2687 if (IN_SET(r, -EINVAL, -EBADSLT))
2688 *invalid_config = true;
2689 if (r < 0)
2690 return r;
2691 break;
2692
2693 default:
2694 log_error("[%s:%u] Unknown command type '%c'.", fname, line, (char) i.type);
2695 *invalid_config = true;
2696 return -EBADMSG;
2697 }
2698
2699 if (!path_is_absolute(i.path)) {
2700 log_error("[%s:%u] Path '%s' not absolute.", fname, line, i.path);
2701 *invalid_config = true;
2702 return -EBADMSG;
2703 }
2704
2705 path_simplify(i.path, false);
2706
2707 if (!should_include_path(i.path))
2708 return 0;
2709
2710 r = specifier_expansion_from_arg(&i);
2711 if (r == -ENXIO)
2712 return log_unresolvable_specifier(fname, line);
2713 if (r < 0) {
2714 if (IN_SET(r, -EINVAL, -EBADSLT))
2715 *invalid_config = true;
2716 return log_error_errno(r, "[%s:%u] Failed to substitute specifiers in argument: %m",
2717 fname, line);
2718 }
2719
2720 if (arg_root) {
2721 char *p;
2722
2723 p = path_join(arg_root, i.path);
2724 if (!p)
2725 return log_oom();
2726 free_and_replace(i.path, p);
2727 }
2728
2729 if (!empty_or_dash(user)) {
2730 const char *u = user;
2731
2732 r = get_user_creds(&u, &i.uid, NULL, NULL, NULL, USER_CREDS_ALLOW_MISSING);
2733 if (r < 0) {
2734 *invalid_config = true;
2735 return log_error_errno(r, "[%s:%u] Unknown user '%s'.", fname, line, user);
2736 }
2737
2738 i.uid_set = true;
2739 }
2740
2741 if (!empty_or_dash(group)) {
2742 const char *g = group;
2743
2744 r = get_group_creds(&g, &i.gid, USER_CREDS_ALLOW_MISSING);
2745 if (r < 0) {
2746 *invalid_config = true;
2747 log_error("[%s:%u] Unknown group '%s'.", fname, line, group);
2748 return r;
2749 }
2750
2751 i.gid_set = true;
2752 }
2753
2754 if (!empty_or_dash(mode)) {
2755 const char *mm = mode;
2756 unsigned m;
2757
2758 if (*mm == '~') {
2759 i.mask_perms = true;
2760 mm++;
2761 }
2762
2763 if (parse_mode(mm, &m) < 0) {
2764 *invalid_config = true;
2765 log_error("[%s:%u] Invalid mode '%s'.", fname, line, mode);
2766 return -EBADMSG;
2767 }
2768
2769 i.mode = m;
2770 i.mode_set = true;
2771 } else
2772 i.mode = IN_SET(i.type, CREATE_DIRECTORY, TRUNCATE_DIRECTORY, CREATE_SUBVOLUME, CREATE_SUBVOLUME_INHERIT_QUOTA, CREATE_SUBVOLUME_NEW_QUOTA) ? 0755 : 0644;
2773
2774 if (!empty_or_dash(age)) {
2775 const char *a = age;
2776
2777 if (*a == '~') {
2778 i.keep_first_level = true;
2779 a++;
2780 }
2781
2782 if (parse_sec(a, &i.age) < 0) {
2783 *invalid_config = true;
2784 log_error("[%s:%u] Invalid age '%s'.", fname, line, age);
2785 return -EBADMSG;
2786 }
2787
2788 i.age_set = true;
2789 }
2790
2791 h = needs_glob(i.type) ? globs : items;
2792
2793 existing = ordered_hashmap_get(h, i.path);
2794 if (existing) {
2795 size_t n;
2796
2797 for (n = 0; n < existing->n_items; n++) {
2798 if (!item_compatible(existing->items + n, &i) && !i.append_or_force) {
2799 log_notice("[%s:%u] Duplicate line for path \"%s\", ignoring.",
2800 fname, line, i.path);
2801 return 0;
2802 }
2803 }
2804 } else {
2805 existing = new0(ItemArray, 1);
2806 if (!existing)
2807 return log_oom();
2808
2809 r = ordered_hashmap_put(h, i.path, existing);
2810 if (r < 0) {
2811 free(existing);
2812 return log_oom();
2813 }
2814 }
2815
2816 if (!GREEDY_REALLOC(existing->items, existing->allocated, existing->n_items + 1))
2817 return log_oom();
2818
2819 existing->items[existing->n_items++] = i;
2820 i = (struct Item) {};
2821
2822 /* Sort item array, to enforce stable ordering of application */
2823 typesafe_qsort(existing->items, existing->n_items, item_compare);
2824
2825 return 0;
2826 }
2827
2828 static int cat_config(char **config_dirs, char **args) {
2829 _cleanup_strv_free_ char **files = NULL;
2830 int r;
2831
2832 r = conf_files_list_with_replacement(arg_root, config_dirs, arg_replace, &files, NULL);
2833 if (r < 0)
2834 return r;
2835
2836 return cat_files(NULL, files, 0);
2837 }
2838
2839 static int help(void) {
2840 _cleanup_free_ char *link = NULL;
2841 int r;
2842
2843 r = terminal_urlify_man("systemd-tmpfiles", "8", &link);
2844 if (r < 0)
2845 return log_oom();
2846
2847 printf("%s [OPTIONS...] [CONFIGURATION FILE...]\n\n"
2848 "Creates, deletes and cleans up volatile and temporary files and directories.\n\n"
2849 " -h --help Show this help\n"
2850 " --user Execute user configuration\n"
2851 " --version Show package version\n"
2852 " --cat-config Show configuration files\n"
2853 " --create Create marked files/directories\n"
2854 " --clean Clean up marked directories\n"
2855 " --remove Remove marked files/directories\n"
2856 " --boot Execute actions only safe at boot\n"
2857 " --prefix=PATH Only apply rules with the specified prefix\n"
2858 " --exclude-prefix=PATH Ignore rules with the specified prefix\n"
2859 " --root=PATH Operate on an alternate filesystem root\n"
2860 " --replace=PATH Treat arguments as replacement for PATH\n"
2861 " --no-pager Do not pipe output into a pager\n"
2862 "\nSee the %s for details.\n"
2863 , program_invocation_short_name
2864 , link
2865 );
2866
2867 return 0;
2868 }
2869
2870 static int parse_argv(int argc, char *argv[]) {
2871
2872 enum {
2873 ARG_VERSION = 0x100,
2874 ARG_CAT_CONFIG,
2875 ARG_USER,
2876 ARG_CREATE,
2877 ARG_CLEAN,
2878 ARG_REMOVE,
2879 ARG_BOOT,
2880 ARG_PREFIX,
2881 ARG_EXCLUDE_PREFIX,
2882 ARG_ROOT,
2883 ARG_REPLACE,
2884 ARG_NO_PAGER,
2885 };
2886
2887 static const struct option options[] = {
2888 { "help", no_argument, NULL, 'h' },
2889 { "user", no_argument, NULL, ARG_USER },
2890 { "version", no_argument, NULL, ARG_VERSION },
2891 { "cat-config", no_argument, NULL, ARG_CAT_CONFIG },
2892 { "create", no_argument, NULL, ARG_CREATE },
2893 { "clean", no_argument, NULL, ARG_CLEAN },
2894 { "remove", no_argument, NULL, ARG_REMOVE },
2895 { "boot", no_argument, NULL, ARG_BOOT },
2896 { "prefix", required_argument, NULL, ARG_PREFIX },
2897 { "exclude-prefix", required_argument, NULL, ARG_EXCLUDE_PREFIX },
2898 { "root", required_argument, NULL, ARG_ROOT },
2899 { "replace", required_argument, NULL, ARG_REPLACE },
2900 { "no-pager", no_argument, NULL, ARG_NO_PAGER },
2901 {}
2902 };
2903
2904 int c, r;
2905
2906 assert(argc >= 0);
2907 assert(argv);
2908
2909 while ((c = getopt_long(argc, argv, "h", options, NULL)) >= 0)
2910
2911 switch (c) {
2912
2913 case 'h':
2914 return help();
2915
2916 case ARG_VERSION:
2917 return version();
2918
2919 case ARG_CAT_CONFIG:
2920 arg_cat_config = true;
2921 break;
2922
2923 case ARG_USER:
2924 arg_user = true;
2925 break;
2926
2927 case ARG_CREATE:
2928 arg_operation |= OPERATION_CREATE;
2929 break;
2930
2931 case ARG_CLEAN:
2932 arg_operation |= OPERATION_CLEAN;
2933 break;
2934
2935 case ARG_REMOVE:
2936 arg_operation |= OPERATION_REMOVE;
2937 break;
2938
2939 case ARG_BOOT:
2940 arg_boot = true;
2941 break;
2942
2943 case ARG_PREFIX:
2944 if (strv_push(&arg_include_prefixes, optarg) < 0)
2945 return log_oom();
2946 break;
2947
2948 case ARG_EXCLUDE_PREFIX:
2949 if (strv_push(&arg_exclude_prefixes, optarg) < 0)
2950 return log_oom();
2951 break;
2952
2953 case ARG_ROOT:
2954 r = parse_path_argument_and_warn(optarg, true, &arg_root);
2955 if (r < 0)
2956 return r;
2957 break;
2958
2959 case ARG_REPLACE:
2960 if (!path_is_absolute(optarg) ||
2961 !endswith(optarg, ".conf"))
2962 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
2963 "The argument to --replace= must an absolute path to a config file");
2964
2965 arg_replace = optarg;
2966 break;
2967
2968 case ARG_NO_PAGER:
2969 arg_pager_flags |= PAGER_DISABLE;
2970 break;
2971
2972 case '?':
2973 return -EINVAL;
2974
2975 default:
2976 assert_not_reached("Unhandled option");
2977 }
2978
2979 if (arg_operation == 0 && !arg_cat_config)
2980 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
2981 "You need to specify at least one of --clean, --create or --remove.");
2982
2983 if (arg_replace && arg_cat_config)
2984 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
2985 "Option --replace= is not supported with --cat-config");
2986
2987 if (arg_replace && optind >= argc)
2988 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
2989 "When --replace= is given, some configuration items must be specified");
2990
2991 return 1;
2992 }
2993
2994 static int read_config_file(char **config_dirs, const char *fn, bool ignore_enoent, bool *invalid_config) {
2995 _cleanup_fclose_ FILE *_f = NULL;
2996 Iterator iterator;
2997 unsigned v = 0;
2998 FILE *f;
2999 Item *i;
3000 int r = 0;
3001
3002 assert(fn);
3003
3004 if (streq(fn, "-")) {
3005 log_debug("Reading config from stdin…");
3006 fn = "<stdin>";
3007 f = stdin;
3008 } else {
3009 r = search_and_fopen(fn, "re", arg_root, (const char**) config_dirs, &_f);
3010 if (r < 0) {
3011 if (ignore_enoent && r == -ENOENT) {
3012 log_debug_errno(r, "Failed to open \"%s\", ignoring: %m", fn);
3013 return 0;
3014 }
3015
3016 return log_error_errno(r, "Failed to open '%s': %m", fn);
3017 }
3018 log_debug("Reading config file \"%s\"…", fn);
3019 f = _f;
3020 }
3021
3022 for (;;) {
3023 _cleanup_free_ char *line = NULL;
3024 bool invalid_line = false;
3025 char *l;
3026 int k;
3027
3028 k = read_line(f, LONG_LINE_MAX, &line);
3029 if (k < 0)
3030 return log_error_errno(k, "Failed to read '%s': %m", fn);
3031 if (k == 0)
3032 break;
3033
3034 v++;
3035
3036 l = strstrip(line);
3037 if (IN_SET(*l, 0, '#'))
3038 continue;
3039
3040 k = parse_line(fn, v, l, &invalid_line);
3041 if (k < 0) {
3042 if (invalid_line)
3043 /* Allow reporting with a special code if the caller requested this */
3044 *invalid_config = true;
3045 else if (r == 0)
3046 /* The first error becomes our return value */
3047 r = k;
3048 }
3049 }
3050
3051 /* we have to determine age parameter for each entry of type X */
3052 ORDERED_HASHMAP_FOREACH(i, globs, iterator) {
3053 Iterator iter;
3054 Item *j, *candidate_item = NULL;
3055
3056 if (i->type != IGNORE_DIRECTORY_PATH)
3057 continue;
3058
3059 ORDERED_HASHMAP_FOREACH(j, items, iter) {
3060 if (!IN_SET(j->type, CREATE_DIRECTORY, TRUNCATE_DIRECTORY, CREATE_SUBVOLUME, CREATE_SUBVOLUME_INHERIT_QUOTA, CREATE_SUBVOLUME_NEW_QUOTA))
3061 continue;
3062
3063 if (path_equal(j->path, i->path)) {
3064 candidate_item = j;
3065 break;
3066 }
3067
3068 if ((!candidate_item && path_startswith(i->path, j->path)) ||
3069 (candidate_item && path_startswith(j->path, candidate_item->path) && (fnmatch(i->path, j->path, FNM_PATHNAME | FNM_PERIOD) == 0)))
3070 candidate_item = j;
3071 }
3072
3073 if (candidate_item && candidate_item->age_set) {
3074 i->age = candidate_item->age;
3075 i->age_set = true;
3076 }
3077 }
3078
3079 if (ferror(f)) {
3080 log_error_errno(errno, "Failed to read from file %s: %m", fn);
3081 if (r == 0)
3082 r = -EIO;
3083 }
3084
3085 return r;
3086 }
3087
3088 static int parse_arguments(char **config_dirs, char **args, bool *invalid_config) {
3089 char **arg;
3090 int r;
3091
3092 STRV_FOREACH(arg, args) {
3093 r = read_config_file(config_dirs, *arg, false, invalid_config);
3094 if (r < 0)
3095 return r;
3096 }
3097
3098 return 0;
3099 }
3100
3101 static int read_config_files(char **config_dirs, char **args, bool *invalid_config) {
3102 _cleanup_strv_free_ char **files = NULL;
3103 _cleanup_free_ char *p = NULL;
3104 char **f;
3105 int r;
3106
3107 r = conf_files_list_with_replacement(arg_root, config_dirs, arg_replace, &files, &p);
3108 if (r < 0)
3109 return r;
3110
3111 STRV_FOREACH(f, files)
3112 if (p && path_equal(*f, p)) {
3113 log_debug("Parsing arguments at position \"%s\"…", *f);
3114
3115 r = parse_arguments(config_dirs, args, invalid_config);
3116 if (r < 0)
3117 return r;
3118 } else
3119 /* Just warn, ignore result otherwise.
3120 * read_config_file() has some debug output, so no need to print anything. */
3121 (void) read_config_file(config_dirs, *f, true, invalid_config);
3122
3123 return 0;
3124 }
3125
3126 static int link_parent(ItemArray *a) {
3127 const char *path;
3128 char *prefix;
3129 int r;
3130
3131 assert(a);
3132
3133 /* Finds the closest "parent" item array for the specified item array. Then registers the specified item array
3134 * as child of it, and fills the parent in, linking them both ways. This allows us to later create parents
3135 * before their children, and clean up/remove children before their parents. */
3136
3137 if (a->n_items <= 0)
3138 return 0;
3139
3140 path = a->items[0].path;
3141 prefix = newa(char, strlen(path) + 1);
3142 PATH_FOREACH_PREFIX(prefix, path) {
3143 ItemArray *j;
3144
3145 j = ordered_hashmap_get(items, prefix);
3146 if (!j)
3147 j = ordered_hashmap_get(globs, prefix);
3148 if (j) {
3149 r = set_ensure_allocated(&j->children, NULL);
3150 if (r < 0)
3151 return log_oom();
3152
3153 r = set_put(j->children, a);
3154 if (r < 0)
3155 return log_oom();
3156
3157 a->parent = j;
3158 return 1;
3159 }
3160 }
3161
3162 return 0;
3163 }
3164
3165 DEFINE_PRIVATE_HASH_OPS_WITH_VALUE_DESTRUCTOR(item_array_hash_ops, char, string_hash_func, string_compare_func,
3166 ItemArray, item_array_free);
3167
3168 static int run(int argc, char *argv[]) {
3169 _cleanup_strv_free_ char **config_dirs = NULL;
3170 bool invalid_config = false;
3171 Iterator iterator;
3172 ItemArray *a;
3173 enum {
3174 PHASE_REMOVE_AND_CLEAN,
3175 PHASE_CREATE,
3176 _PHASE_MAX
3177 } phase;
3178 int r, k;
3179
3180 r = parse_argv(argc, argv);
3181 if (r <= 0)
3182 return r;
3183
3184 log_setup_service();
3185
3186 /* Descending down file system trees might take a lot of fds */
3187 (void) rlimit_nofile_bump(HIGH_RLIMIT_NOFILE);
3188
3189 if (arg_user) {
3190 r = user_config_paths(&config_dirs);
3191 if (r < 0)
3192 return log_error_errno(r, "Failed to initialize configuration directory list: %m");
3193 } else {
3194 config_dirs = strv_split_nulstr(CONF_PATHS_NULSTR("tmpfiles.d"));
3195 if (!config_dirs)
3196 return log_oom();
3197 }
3198
3199 if (DEBUG_LOGGING) {
3200 _cleanup_free_ char *t = NULL;
3201
3202 t = strv_join(config_dirs, "\n\t");
3203 if (t)
3204 log_debug("Looking for configuration files in (higher priority first):\n\t%s", t);
3205 }
3206
3207 if (arg_cat_config) {
3208 (void) pager_open(arg_pager_flags);
3209
3210 return cat_config(config_dirs, argv + optind);
3211 }
3212
3213 umask(0022);
3214
3215 mac_selinux_init();
3216
3217 items = ordered_hashmap_new(&item_array_hash_ops);
3218 globs = ordered_hashmap_new(&item_array_hash_ops);
3219 if (!items || !globs)
3220 return log_oom();
3221
3222 /* If command line arguments are specified along with --replace, read all
3223 * configuration files and insert the positional arguments at the specified
3224 * place. Otherwise, if command line arguments are specified, execute just
3225 * them, and finally, without --replace= or any positional arguments, just
3226 * read configuration and execute it.
3227 */
3228 if (arg_replace || optind >= argc)
3229 r = read_config_files(config_dirs, argv + optind, &invalid_config);
3230 else
3231 r = parse_arguments(config_dirs, argv + optind, &invalid_config);
3232 if (r < 0)
3233 return r;
3234
3235 /* Let's now link up all child/parent relationships */
3236 ORDERED_HASHMAP_FOREACH(a, items, iterator) {
3237 r = link_parent(a);
3238 if (r < 0)
3239 return r;
3240 }
3241 ORDERED_HASHMAP_FOREACH(a, globs, iterator) {
3242 r = link_parent(a);
3243 if (r < 0)
3244 return r;
3245 }
3246
3247 /* If multiple operations are requested, let's first run the remove/clean operations, and only then the create
3248 * operations. i.e. that we first clean out the platform we then build on. */
3249 for (phase = 0; phase < _PHASE_MAX; phase++) {
3250 OperationMask op;
3251
3252 if (phase == PHASE_REMOVE_AND_CLEAN)
3253 op = arg_operation & (OPERATION_REMOVE|OPERATION_CLEAN);
3254 else if (phase == PHASE_CREATE)
3255 op = arg_operation & OPERATION_CREATE;
3256 else
3257 assert_not_reached("unexpected phase");
3258
3259 if (op == 0) /* Nothing requested in this phase */
3260 continue;
3261
3262 /* The non-globbing ones usually create things, hence we apply them first */
3263 ORDERED_HASHMAP_FOREACH(a, items, iterator) {
3264 k = process_item_array(a, op);
3265 if (k < 0 && r >= 0)
3266 r = k;
3267 }
3268
3269 /* The globbing ones usually alter things, hence we apply them second. */
3270 ORDERED_HASHMAP_FOREACH(a, globs, iterator) {
3271 k = process_item_array(a, op);
3272 if (k < 0 && r >= 0)
3273 r = k;
3274 }
3275 }
3276
3277 if (ERRNO_IS_RESOURCE(-r))
3278 return r;
3279 if (invalid_config)
3280 return EX_DATAERR;
3281 if (r < 0)
3282 return EX_CANTCREAT;
3283 return 0;
3284 }
3285
3286 DEFINE_MAIN_FUNCTION_WITH_POSITIVE_FAILURE(run);
Unnamed repository; edit this file 'description' to name the repository.