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1 | /* SPDX-License-Identifier: LGPL-2.1-or-later */ | |
2 | ||
3 | #include <errno.h> | |
4 | #include <fcntl.h> | |
5 | #include <linux/fs.h> | |
6 | #include <linux/loop.h> | |
7 | #include <linux/magic.h> | |
8 | #include <stdio.h> | |
9 | #include <stdlib.h> | |
10 | #include <sys/file.h> | |
11 | #include <sys/ioctl.h> | |
12 | #include <sys/stat.h> | |
13 | #include <unistd.h> | |
14 | ||
15 | #include "alloc-util.h" | |
16 | #include "btrfs-util.h" | |
17 | #include "chase.h" | |
18 | #include "chattr-util.h" | |
19 | #include "copy.h" | |
20 | #include "dirent-util.h" | |
21 | #include "discover-image.h" | |
22 | #include "dissect-image.h" | |
23 | #include "env-file.h" | |
24 | #include "env-util.h" | |
25 | #include "extension-util.h" | |
26 | #include "fd-util.h" | |
27 | #include "fs-util.h" | |
28 | #include "hashmap.h" | |
29 | #include "hostname-setup.h" | |
30 | #include "id128-util.h" | |
31 | #include "lock-util.h" | |
32 | #include "log.h" | |
33 | #include "loop-util.h" | |
34 | #include "macro.h" | |
35 | #include "mkdir.h" | |
36 | #include "nulstr-util.h" | |
37 | #include "os-util.h" | |
38 | #include "path-util.h" | |
39 | #include "rm-rf.h" | |
40 | #include "stat-util.h" | |
41 | #include "string-table.h" | |
42 | #include "string-util.h" | |
43 | #include "strv.h" | |
44 | #include "time-util.h" | |
45 | #include "utf8.h" | |
46 | #include "xattr-util.h" | |
47 | ||
48 | static const char* const image_search_path[_IMAGE_CLASS_MAX] = { | |
49 | [IMAGE_MACHINE] = "/etc/machines\0" /* only place symlinks here */ | |
50 | "/run/machines\0" /* and here too */ | |
51 | "/var/lib/machines\0" /* the main place for images */ | |
52 | "/var/lib/container\0" /* legacy */ | |
53 | "/usr/local/lib/machines\0" | |
54 | "/usr/lib/machines\0", | |
55 | ||
56 | [IMAGE_PORTABLE] = "/etc/portables\0" /* only place symlinks here */ | |
57 | "/run/portables\0" /* and here too */ | |
58 | "/var/lib/portables\0" /* the main place for images */ | |
59 | "/usr/local/lib/portables\0" | |
60 | "/usr/lib/portables\0", | |
61 | ||
62 | /* Note that we don't allow storing extensions under /usr/, unlike with other image types. That's | |
63 | * because extension images are supposed to extend /usr/, so you get into recursive races, especially | |
64 | * with directory-based extensions, as the kernel's OverlayFS explicitly checks for this and errors | |
65 | * out with -ELOOP if it finds that a lowerdir= is a child of another lowerdir=. */ | |
66 | [IMAGE_EXTENSION] = "/etc/extensions\0" /* only place symlinks here */ | |
67 | "/run/extensions\0" /* and here too */ | |
68 | "/var/lib/extensions\0", /* the main place for images */ | |
69 | }; | |
70 | ||
71 | static Image *image_free(Image *i) { | |
72 | assert(i); | |
73 | ||
74 | free(i->name); | |
75 | free(i->path); | |
76 | ||
77 | free(i->hostname); | |
78 | strv_free(i->machine_info); | |
79 | strv_free(i->os_release); | |
80 | strv_free(i->extension_release); | |
81 | ||
82 | return mfree(i); | |
83 | } | |
84 | ||
85 | DEFINE_TRIVIAL_REF_UNREF_FUNC(Image, image, image_free); | |
86 | DEFINE_HASH_OPS_WITH_VALUE_DESTRUCTOR(image_hash_ops, char, string_hash_func, string_compare_func, | |
87 | Image, image_unref); | |
88 | ||
89 | static char **image_settings_path(Image *image) { | |
90 | _cleanup_strv_free_ char **l = NULL; | |
91 | _cleanup_free_ char *fn = NULL; | |
92 | size_t i = 0; | |
93 | int r; | |
94 | ||
95 | assert(image); | |
96 | ||
97 | l = new0(char*, 4); | |
98 | if (!l) | |
99 | return NULL; | |
100 | ||
101 | fn = strjoin(image->name, ".nspawn"); | |
102 | if (!fn) | |
103 | return NULL; | |
104 | ||
105 | FOREACH_STRING(s, "/etc/systemd/nspawn", "/run/systemd/nspawn") { | |
106 | l[i] = path_join(s, fn); | |
107 | if (!l[i]) | |
108 | return NULL; | |
109 | ||
110 | i++; | |
111 | } | |
112 | ||
113 | r = file_in_same_dir(image->path, fn, l + i); | |
114 | if (r == -ENOMEM) | |
115 | return NULL; | |
116 | if (r < 0) | |
117 | log_debug_errno(r, "Failed to generate .nspawn settings path from image path, ignoring: %m"); | |
118 | ||
119 | strv_uniq(l); | |
120 | ||
121 | return TAKE_PTR(l); | |
122 | } | |
123 | ||
124 | static int image_roothash_path(Image *image, char **ret) { | |
125 | _cleanup_free_ char *fn = NULL; | |
126 | ||
127 | assert(image); | |
128 | ||
129 | fn = strjoin(image->name, ".roothash"); | |
130 | if (!fn) | |
131 | return -ENOMEM; | |
132 | ||
133 | return file_in_same_dir(image->path, fn, ret); | |
134 | } | |
135 | ||
136 | static int image_new( | |
137 | ImageType t, | |
138 | ImageClass c, | |
139 | const char *pretty, | |
140 | const char *path, | |
141 | const char *filename, | |
142 | bool read_only, | |
143 | usec_t crtime, | |
144 | usec_t mtime, | |
145 | Image **ret) { | |
146 | ||
147 | _cleanup_(image_unrefp) Image *i = NULL; | |
148 | ||
149 | assert(t >= 0); | |
150 | assert(t < _IMAGE_TYPE_MAX); | |
151 | assert(pretty); | |
152 | assert(filename); | |
153 | assert(ret); | |
154 | ||
155 | i = new(Image, 1); | |
156 | if (!i) | |
157 | return -ENOMEM; | |
158 | ||
159 | *i = (Image) { | |
160 | .n_ref = 1, | |
161 | .type = t, | |
162 | .class = c, | |
163 | .read_only = read_only, | |
164 | .crtime = crtime, | |
165 | .mtime = mtime, | |
166 | .usage = UINT64_MAX, | |
167 | .usage_exclusive = UINT64_MAX, | |
168 | .limit = UINT64_MAX, | |
169 | .limit_exclusive = UINT64_MAX, | |
170 | }; | |
171 | ||
172 | i->name = strdup(pretty); | |
173 | if (!i->name) | |
174 | return -ENOMEM; | |
175 | ||
176 | i->path = path_join(path, filename); | |
177 | if (!i->path) | |
178 | return -ENOMEM; | |
179 | ||
180 | path_simplify(i->path); | |
181 | ||
182 | *ret = TAKE_PTR(i); | |
183 | ||
184 | return 0; | |
185 | } | |
186 | ||
187 | static int extract_pretty(const char *path, const char *suffix, char **ret) { | |
188 | _cleanup_free_ char *name = NULL; | |
189 | const char *p; | |
190 | ||
191 | assert(path); | |
192 | assert(ret); | |
193 | ||
194 | p = last_path_component(path); | |
195 | ||
196 | name = strdupcspn(p, "/"); | |
197 | if (!name) | |
198 | return -ENOMEM; | |
199 | ||
200 | if (suffix) { | |
201 | char *e; | |
202 | ||
203 | e = endswith(name, suffix); | |
204 | if (!e) | |
205 | return -EINVAL; | |
206 | ||
207 | *e = 0; | |
208 | } | |
209 | ||
210 | if (!image_name_is_valid(name)) | |
211 | return -EINVAL; | |
212 | ||
213 | *ret = TAKE_PTR(name); | |
214 | return 0; | |
215 | } | |
216 | ||
217 | static int image_make( | |
218 | ImageClass c, | |
219 | const char *pretty, | |
220 | int dfd, | |
221 | const char *path, | |
222 | const char *filename, | |
223 | const struct stat *st, | |
224 | Image **ret) { | |
225 | ||
226 | _cleanup_free_ char *pretty_buffer = NULL, *parent = NULL; | |
227 | struct stat stbuf; | |
228 | bool read_only; | |
229 | int r; | |
230 | ||
231 | assert(dfd >= 0 || dfd == AT_FDCWD); | |
232 | assert(path || dfd == AT_FDCWD); | |
233 | assert(filename); | |
234 | ||
235 | /* We explicitly *do* follow symlinks here, since we want to allow symlinking trees, raw files and block | |
236 | * devices into /var/lib/machines/, and treat them normally. | |
237 | * | |
238 | * This function returns -ENOENT if we can't find the image after all, and -EMEDIUMTYPE if it's not a file we | |
239 | * recognize. */ | |
240 | ||
241 | if (!st) { | |
242 | if (fstatat(dfd, filename, &stbuf, 0) < 0) | |
243 | return -errno; | |
244 | ||
245 | st = &stbuf; | |
246 | } | |
247 | ||
248 | if (!path) { | |
249 | if (dfd == AT_FDCWD) | |
250 | (void) safe_getcwd(&parent); | |
251 | else | |
252 | (void) fd_get_path(dfd, &parent); | |
253 | } | |
254 | ||
255 | read_only = | |
256 | (path && path_startswith(path, "/usr")) || | |
257 | (faccessat(dfd, filename, W_OK, AT_EACCESS) < 0 && errno == EROFS); | |
258 | ||
259 | if (S_ISDIR(st->st_mode)) { | |
260 | _cleanup_close_ int fd = -EBADF; | |
261 | unsigned file_attr = 0; | |
262 | usec_t crtime = 0; | |
263 | ||
264 | if (!ret) | |
265 | return 0; | |
266 | ||
267 | if (!pretty) { | |
268 | r = extract_pretty(filename, NULL, &pretty_buffer); | |
269 | if (r < 0) | |
270 | return r; | |
271 | ||
272 | pretty = pretty_buffer; | |
273 | } | |
274 | ||
275 | fd = openat(dfd, filename, O_CLOEXEC|O_NOCTTY|O_DIRECTORY); | |
276 | if (fd < 0) | |
277 | return -errno; | |
278 | ||
279 | if (btrfs_might_be_subvol(st)) { | |
280 | ||
281 | r = fd_is_fs_type(fd, BTRFS_SUPER_MAGIC); | |
282 | if (r < 0) | |
283 | return r; | |
284 | if (r) { | |
285 | BtrfsSubvolInfo info; | |
286 | ||
287 | /* It's a btrfs subvolume */ | |
288 | ||
289 | r = btrfs_subvol_get_info_fd(fd, 0, &info); | |
290 | if (r < 0) | |
291 | return r; | |
292 | ||
293 | r = image_new(IMAGE_SUBVOLUME, | |
294 | c, | |
295 | pretty, | |
296 | path, | |
297 | filename, | |
298 | info.read_only || read_only, | |
299 | info.otime, | |
300 | 0, | |
301 | ret); | |
302 | if (r < 0) | |
303 | return r; | |
304 | ||
305 | if (btrfs_quota_scan_ongoing(fd) == 0) { | |
306 | BtrfsQuotaInfo quota; | |
307 | ||
308 | r = btrfs_subvol_get_subtree_quota_fd(fd, 0, "a); | |
309 | if (r >= 0) { | |
310 | (*ret)->usage = quota.referenced; | |
311 | (*ret)->usage_exclusive = quota.exclusive; | |
312 | ||
313 | (*ret)->limit = quota.referenced_max; | |
314 | (*ret)->limit_exclusive = quota.exclusive_max; | |
315 | } | |
316 | } | |
317 | ||
318 | return 0; | |
319 | } | |
320 | } | |
321 | ||
322 | /* Get directory creation time (not available everywhere, but that's OK */ | |
323 | (void) fd_getcrtime(fd, &crtime); | |
324 | ||
325 | /* If the IMMUTABLE bit is set, we consider the directory read-only. Since the ioctl is not | |
326 | * supported everywhere we ignore failures. */ | |
327 | (void) read_attr_fd(fd, &file_attr); | |
328 | ||
329 | /* It's just a normal directory. */ | |
330 | r = image_new(IMAGE_DIRECTORY, | |
331 | c, | |
332 | pretty, | |
333 | path, | |
334 | filename, | |
335 | read_only || (file_attr & FS_IMMUTABLE_FL), | |
336 | crtime, | |
337 | 0, /* we don't use mtime of stat() here, since it's not the time of last change of the tree, but only of the top-level dir */ | |
338 | ret); | |
339 | if (r < 0) | |
340 | return r; | |
341 | ||
342 | return 0; | |
343 | ||
344 | } else if (S_ISREG(st->st_mode) && endswith(filename, ".raw")) { | |
345 | usec_t crtime = 0; | |
346 | ||
347 | /* It's a RAW disk image */ | |
348 | ||
349 | if (!ret) | |
350 | return 0; | |
351 | ||
352 | (void) fd_getcrtime_at(dfd, filename, AT_SYMLINK_FOLLOW, &crtime); | |
353 | ||
354 | if (!pretty) { | |
355 | r = extract_pretty(filename, ".raw", &pretty_buffer); | |
356 | if (r < 0) | |
357 | return r; | |
358 | ||
359 | pretty = pretty_buffer; | |
360 | } | |
361 | ||
362 | r = image_new(IMAGE_RAW, | |
363 | c, | |
364 | pretty, | |
365 | path, | |
366 | filename, | |
367 | !(st->st_mode & 0222) || read_only, | |
368 | crtime, | |
369 | timespec_load(&st->st_mtim), | |
370 | ret); | |
371 | if (r < 0) | |
372 | return r; | |
373 | ||
374 | (*ret)->usage = (*ret)->usage_exclusive = st->st_blocks * 512; | |
375 | (*ret)->limit = (*ret)->limit_exclusive = st->st_size; | |
376 | ||
377 | return 0; | |
378 | ||
379 | } else if (S_ISBLK(st->st_mode)) { | |
380 | _cleanup_close_ int block_fd = -EBADF; | |
381 | uint64_t size = UINT64_MAX; | |
382 | ||
383 | /* A block device */ | |
384 | ||
385 | if (!ret) | |
386 | return 0; | |
387 | ||
388 | if (!pretty) { | |
389 | r = extract_pretty(filename, NULL, &pretty_buffer); | |
390 | if (r < 0) | |
391 | return r; | |
392 | ||
393 | pretty = pretty_buffer; | |
394 | } | |
395 | ||
396 | block_fd = openat(dfd, filename, O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_NOCTTY); | |
397 | if (block_fd < 0) | |
398 | log_debug_errno(errno, "Failed to open block device %s/%s, ignoring: %m", path ?: strnull(parent), filename); | |
399 | else { | |
400 | /* Refresh stat data after opening the node */ | |
401 | if (fstat(block_fd, &stbuf) < 0) | |
402 | return -errno; | |
403 | st = &stbuf; | |
404 | ||
405 | if (!S_ISBLK(st->st_mode)) /* Verify that what we opened is actually what we think it is */ | |
406 | return -ENOTTY; | |
407 | ||
408 | if (!read_only) { | |
409 | int state = 0; | |
410 | ||
411 | if (ioctl(block_fd, BLKROGET, &state) < 0) | |
412 | log_debug_errno(errno, "Failed to issue BLKROGET on device %s/%s, ignoring: %m", path ?: strnull(parent), filename); | |
413 | else if (state) | |
414 | read_only = true; | |
415 | } | |
416 | ||
417 | if (ioctl(block_fd, BLKGETSIZE64, &size) < 0) | |
418 | log_debug_errno(errno, "Failed to issue BLKGETSIZE64 on device %s/%s, ignoring: %m", path ?: strnull(parent), filename); | |
419 | ||
420 | block_fd = safe_close(block_fd); | |
421 | } | |
422 | ||
423 | r = image_new(IMAGE_BLOCK, | |
424 | c, | |
425 | pretty, | |
426 | path, | |
427 | filename, | |
428 | !(st->st_mode & 0222) || read_only, | |
429 | 0, | |
430 | 0, | |
431 | ret); | |
432 | if (r < 0) | |
433 | return r; | |
434 | ||
435 | if (!IN_SET(size, 0, UINT64_MAX)) | |
436 | (*ret)->usage = (*ret)->usage_exclusive = (*ret)->limit = (*ret)->limit_exclusive = size; | |
437 | ||
438 | return 0; | |
439 | } | |
440 | ||
441 | return -EMEDIUMTYPE; | |
442 | } | |
443 | ||
444 | int image_find(ImageClass class, | |
445 | const char *name, | |
446 | const char *root, | |
447 | Image **ret) { | |
448 | ||
449 | int r; | |
450 | ||
451 | assert(class >= 0); | |
452 | assert(class < _IMAGE_CLASS_MAX); | |
453 | assert(name); | |
454 | ||
455 | /* There are no images with invalid names */ | |
456 | if (!image_name_is_valid(name)) | |
457 | return -ENOENT; | |
458 | ||
459 | NULSTR_FOREACH(path, image_search_path[class]) { | |
460 | _cleanup_free_ char *resolved = NULL; | |
461 | _cleanup_closedir_ DIR *d = NULL; | |
462 | struct stat st; | |
463 | int flags; | |
464 | ||
465 | r = chase_and_opendir(path, root, CHASE_PREFIX_ROOT, &resolved, &d); | |
466 | if (r == -ENOENT) | |
467 | continue; | |
468 | if (r < 0) | |
469 | return r; | |
470 | ||
471 | /* As mentioned above, we follow symlinks on this fstatat(), because we want to permit people | |
472 | * to symlink block devices into the search path. (For now, we disable that when operating | |
473 | * relative to some root directory.) */ | |
474 | flags = root ? AT_SYMLINK_NOFOLLOW : 0; | |
475 | if (fstatat(dirfd(d), name, &st, flags) < 0) { | |
476 | _cleanup_free_ char *raw = NULL; | |
477 | ||
478 | if (errno != ENOENT) | |
479 | return -errno; | |
480 | ||
481 | raw = strjoin(name, ".raw"); | |
482 | if (!raw) | |
483 | return -ENOMEM; | |
484 | ||
485 | if (fstatat(dirfd(d), raw, &st, flags) < 0) { | |
486 | if (errno == ENOENT) | |
487 | continue; | |
488 | ||
489 | return -errno; | |
490 | } | |
491 | ||
492 | if (!S_ISREG(st.st_mode)) | |
493 | continue; | |
494 | ||
495 | r = image_make(class, name, dirfd(d), resolved, raw, &st, ret); | |
496 | ||
497 | } else { | |
498 | if (!S_ISDIR(st.st_mode) && !S_ISBLK(st.st_mode)) | |
499 | continue; | |
500 | ||
501 | r = image_make(class, name, dirfd(d), resolved, name, &st, ret); | |
502 | } | |
503 | if (IN_SET(r, -ENOENT, -EMEDIUMTYPE)) | |
504 | continue; | |
505 | if (r < 0) | |
506 | return r; | |
507 | ||
508 | if (ret) | |
509 | (*ret)->discoverable = true; | |
510 | ||
511 | return 1; | |
512 | } | |
513 | ||
514 | if (class == IMAGE_MACHINE && streq(name, ".host")) { | |
515 | r = image_make(class, ".host", AT_FDCWD, NULL, empty_to_root(root), NULL, ret); | |
516 | if (r < 0) | |
517 | return r; | |
518 | ||
519 | if (ret) | |
520 | (*ret)->discoverable = true; | |
521 | ||
522 | return r; | |
523 | } | |
524 | ||
525 | return -ENOENT; | |
526 | }; | |
527 | ||
528 | int image_from_path(const char *path, Image **ret) { | |
529 | ||
530 | /* Note that we don't set the 'discoverable' field of the returned object, because we don't check here whether | |
531 | * the image is in the image search path. And if it is we don't know if the path we used is actually not | |
532 | * overridden by another, different image earlier in the search path */ | |
533 | ||
534 | if (path_equal(path, "/")) | |
535 | return image_make(IMAGE_MACHINE, ".host", AT_FDCWD, NULL, "/", NULL, ret); | |
536 | ||
537 | return image_make(_IMAGE_CLASS_INVALID, NULL, AT_FDCWD, NULL, path, NULL, ret); | |
538 | } | |
539 | ||
540 | int image_find_harder(ImageClass class, const char *name_or_path, const char *root, Image **ret) { | |
541 | if (image_name_is_valid(name_or_path)) | |
542 | return image_find(class, name_or_path, root, ret); | |
543 | ||
544 | return image_from_path(name_or_path, ret); | |
545 | } | |
546 | ||
547 | int image_discover( | |
548 | ImageClass class, | |
549 | const char *root, | |
550 | Hashmap *h) { | |
551 | ||
552 | int r; | |
553 | ||
554 | assert(class >= 0); | |
555 | assert(class < _IMAGE_CLASS_MAX); | |
556 | assert(h); | |
557 | ||
558 | NULSTR_FOREACH(path, image_search_path[class]) { | |
559 | _cleanup_free_ char *resolved = NULL; | |
560 | _cleanup_closedir_ DIR *d = NULL; | |
561 | ||
562 | r = chase_and_opendir(path, root, CHASE_PREFIX_ROOT, &resolved, &d); | |
563 | if (r == -ENOENT) | |
564 | continue; | |
565 | if (r < 0) | |
566 | return r; | |
567 | ||
568 | FOREACH_DIRENT_ALL(de, d, return -errno) { | |
569 | _cleanup_(image_unrefp) Image *image = NULL; | |
570 | _cleanup_free_ char *truncated = NULL; | |
571 | const char *pretty; | |
572 | struct stat st; | |
573 | int flags; | |
574 | ||
575 | if (dot_or_dot_dot(de->d_name)) | |
576 | continue; | |
577 | ||
578 | /* As mentioned above, we follow symlinks on this fstatat(), because we want to | |
579 | * permit people to symlink block devices into the search path. */ | |
580 | flags = root ? AT_SYMLINK_NOFOLLOW : 0; | |
581 | if (fstatat(dirfd(d), de->d_name, &st, flags) < 0) { | |
582 | if (errno == ENOENT) | |
583 | continue; | |
584 | ||
585 | return -errno; | |
586 | } | |
587 | ||
588 | if (S_ISREG(st.st_mode)) { | |
589 | const char *e; | |
590 | ||
591 | e = endswith(de->d_name, ".raw"); | |
592 | if (!e) | |
593 | continue; | |
594 | ||
595 | truncated = strndup(de->d_name, e - de->d_name); | |
596 | if (!truncated) | |
597 | return -ENOMEM; | |
598 | ||
599 | pretty = truncated; | |
600 | } else if (S_ISDIR(st.st_mode) || S_ISBLK(st.st_mode)) | |
601 | pretty = de->d_name; | |
602 | else | |
603 | continue; | |
604 | ||
605 | if (!image_name_is_valid(pretty)) | |
606 | continue; | |
607 | ||
608 | if (hashmap_contains(h, pretty)) | |
609 | continue; | |
610 | ||
611 | r = image_make(class, pretty, dirfd(d), resolved, de->d_name, &st, &image); | |
612 | if (IN_SET(r, -ENOENT, -EMEDIUMTYPE)) | |
613 | continue; | |
614 | if (r < 0) | |
615 | return r; | |
616 | ||
617 | image->discoverable = true; | |
618 | ||
619 | r = hashmap_put(h, image->name, image); | |
620 | if (r < 0) | |
621 | return r; | |
622 | ||
623 | image = NULL; | |
624 | } | |
625 | } | |
626 | ||
627 | if (class == IMAGE_MACHINE && !hashmap_contains(h, ".host")) { | |
628 | _cleanup_(image_unrefp) Image *image = NULL; | |
629 | ||
630 | r = image_make(IMAGE_MACHINE, ".host", AT_FDCWD, NULL, empty_to_root("/"), NULL, &image); | |
631 | if (r < 0) | |
632 | return r; | |
633 | ||
634 | image->discoverable = true; | |
635 | ||
636 | r = hashmap_put(h, image->name, image); | |
637 | if (r < 0) | |
638 | return r; | |
639 | ||
640 | image = NULL; | |
641 | } | |
642 | ||
643 | return 0; | |
644 | } | |
645 | ||
646 | int image_remove(Image *i) { | |
647 | _cleanup_(release_lock_file) LockFile global_lock = LOCK_FILE_INIT, local_lock = LOCK_FILE_INIT; | |
648 | _cleanup_strv_free_ char **settings = NULL; | |
649 | _cleanup_free_ char *roothash = NULL; | |
650 | int r; | |
651 | ||
652 | assert(i); | |
653 | ||
654 | if (IMAGE_IS_VENDOR(i) || IMAGE_IS_HOST(i)) | |
655 | return -EROFS; | |
656 | ||
657 | settings = image_settings_path(i); | |
658 | if (!settings) | |
659 | return -ENOMEM; | |
660 | ||
661 | r = image_roothash_path(i, &roothash); | |
662 | if (r < 0) | |
663 | return r; | |
664 | ||
665 | /* Make sure we don't interfere with a running nspawn */ | |
666 | r = image_path_lock(i->path, LOCK_EX|LOCK_NB, &global_lock, &local_lock); | |
667 | if (r < 0) | |
668 | return r; | |
669 | ||
670 | switch (i->type) { | |
671 | ||
672 | case IMAGE_SUBVOLUME: | |
673 | ||
674 | /* Let's unlink first, maybe it is a symlink? If that works we are happy. Otherwise, let's get out the | |
675 | * big guns */ | |
676 | if (unlink(i->path) < 0) { | |
677 | r = btrfs_subvol_remove(i->path, BTRFS_REMOVE_RECURSIVE|BTRFS_REMOVE_QUOTA); | |
678 | if (r < 0) | |
679 | return r; | |
680 | } | |
681 | ||
682 | break; | |
683 | ||
684 | case IMAGE_DIRECTORY: | |
685 | /* Allow deletion of read-only directories */ | |
686 | (void) chattr_path(i->path, 0, FS_IMMUTABLE_FL, NULL); | |
687 | r = rm_rf(i->path, REMOVE_ROOT|REMOVE_PHYSICAL|REMOVE_SUBVOLUME); | |
688 | if (r < 0) | |
689 | return r; | |
690 | ||
691 | break; | |
692 | ||
693 | case IMAGE_BLOCK: | |
694 | ||
695 | /* If this is inside of /dev, then it's a real block device, hence let's not touch the device node | |
696 | * itself (but let's remove the stuff stored alongside it). If it's anywhere else, let's try to unlink | |
697 | * the thing (it's most likely a symlink after all). */ | |
698 | ||
699 | if (path_startswith(i->path, "/dev")) | |
700 | break; | |
701 | ||
702 | _fallthrough_; | |
703 | case IMAGE_RAW: | |
704 | if (unlink(i->path) < 0) | |
705 | return -errno; | |
706 | break; | |
707 | ||
708 | default: | |
709 | return -EOPNOTSUPP; | |
710 | } | |
711 | ||
712 | STRV_FOREACH(j, settings) | |
713 | if (unlink(*j) < 0 && errno != ENOENT) | |
714 | log_debug_errno(errno, "Failed to unlink %s, ignoring: %m", *j); | |
715 | ||
716 | if (unlink(roothash) < 0 && errno != ENOENT) | |
717 | log_debug_errno(errno, "Failed to unlink %s, ignoring: %m", roothash); | |
718 | ||
719 | return 0; | |
720 | } | |
721 | ||
722 | static int rename_auxiliary_file(const char *path, const char *new_name, const char *suffix) { | |
723 | _cleanup_free_ char *fn = NULL, *rs = NULL; | |
724 | int r; | |
725 | ||
726 | fn = strjoin(new_name, suffix); | |
727 | if (!fn) | |
728 | return -ENOMEM; | |
729 | ||
730 | r = file_in_same_dir(path, fn, &rs); | |
731 | if (r < 0) | |
732 | return r; | |
733 | ||
734 | return rename_noreplace(AT_FDCWD, path, AT_FDCWD, rs); | |
735 | } | |
736 | ||
737 | int image_rename(Image *i, const char *new_name) { | |
738 | _cleanup_(release_lock_file) LockFile global_lock = LOCK_FILE_INIT, local_lock = LOCK_FILE_INIT, name_lock = LOCK_FILE_INIT; | |
739 | _cleanup_free_ char *new_path = NULL, *nn = NULL, *roothash = NULL; | |
740 | _cleanup_strv_free_ char **settings = NULL; | |
741 | unsigned file_attr = 0; | |
742 | int r; | |
743 | ||
744 | assert(i); | |
745 | ||
746 | if (!image_name_is_valid(new_name)) | |
747 | return -EINVAL; | |
748 | ||
749 | if (IMAGE_IS_VENDOR(i) || IMAGE_IS_HOST(i)) | |
750 | return -EROFS; | |
751 | ||
752 | settings = image_settings_path(i); | |
753 | if (!settings) | |
754 | return -ENOMEM; | |
755 | ||
756 | r = image_roothash_path(i, &roothash); | |
757 | if (r < 0) | |
758 | return r; | |
759 | ||
760 | /* Make sure we don't interfere with a running nspawn */ | |
761 | r = image_path_lock(i->path, LOCK_EX|LOCK_NB, &global_lock, &local_lock); | |
762 | if (r < 0) | |
763 | return r; | |
764 | ||
765 | /* Make sure nobody takes the new name, between the time we | |
766 | * checked it is currently unused in all search paths, and the | |
767 | * time we take possession of it */ | |
768 | r = image_name_lock(new_name, LOCK_EX|LOCK_NB, &name_lock); | |
769 | if (r < 0) | |
770 | return r; | |
771 | ||
772 | r = image_find(IMAGE_MACHINE, new_name, NULL, NULL); | |
773 | if (r >= 0) | |
774 | return -EEXIST; | |
775 | if (r != -ENOENT) | |
776 | return r; | |
777 | ||
778 | switch (i->type) { | |
779 | ||
780 | case IMAGE_DIRECTORY: | |
781 | /* Turn of the immutable bit while we rename the image, so that we can rename it */ | |
782 | (void) read_attr_path(i->path, &file_attr); | |
783 | ||
784 | if (file_attr & FS_IMMUTABLE_FL) | |
785 | (void) chattr_path(i->path, 0, FS_IMMUTABLE_FL, NULL); | |
786 | ||
787 | _fallthrough_; | |
788 | case IMAGE_SUBVOLUME: | |
789 | r = file_in_same_dir(i->path, new_name, &new_path); | |
790 | break; | |
791 | ||
792 | case IMAGE_BLOCK: | |
793 | ||
794 | /* Refuse renaming raw block devices in /dev, the names are picked by udev after all. */ | |
795 | if (path_startswith(i->path, "/dev")) | |
796 | return -EROFS; | |
797 | ||
798 | r = file_in_same_dir(i->path, new_name, &new_path); | |
799 | break; | |
800 | ||
801 | case IMAGE_RAW: { | |
802 | const char *fn; | |
803 | ||
804 | fn = strjoina(new_name, ".raw"); | |
805 | ||
806 | r = file_in_same_dir(i->path, fn, &new_path); | |
807 | break; | |
808 | } | |
809 | ||
810 | default: | |
811 | return -EOPNOTSUPP; | |
812 | } | |
813 | if (r < 0) | |
814 | return r; | |
815 | ||
816 | nn = strdup(new_name); | |
817 | if (!nn) | |
818 | return -ENOMEM; | |
819 | ||
820 | r = rename_noreplace(AT_FDCWD, i->path, AT_FDCWD, new_path); | |
821 | if (r < 0) | |
822 | return r; | |
823 | ||
824 | /* Restore the immutable bit, if it was set before */ | |
825 | if (file_attr & FS_IMMUTABLE_FL) | |
826 | (void) chattr_path(new_path, FS_IMMUTABLE_FL, FS_IMMUTABLE_FL, NULL); | |
827 | ||
828 | free_and_replace(i->path, new_path); | |
829 | free_and_replace(i->name, nn); | |
830 | ||
831 | STRV_FOREACH(j, settings) { | |
832 | r = rename_auxiliary_file(*j, new_name, ".nspawn"); | |
833 | if (r < 0 && r != -ENOENT) | |
834 | log_debug_errno(r, "Failed to rename settings file %s, ignoring: %m", *j); | |
835 | } | |
836 | ||
837 | r = rename_auxiliary_file(roothash, new_name, ".roothash"); | |
838 | if (r < 0 && r != -ENOENT) | |
839 | log_debug_errno(r, "Failed to rename roothash file %s, ignoring: %m", roothash); | |
840 | ||
841 | return 0; | |
842 | } | |
843 | ||
844 | static int clone_auxiliary_file(const char *path, const char *new_name, const char *suffix) { | |
845 | _cleanup_free_ char *fn = NULL, *rs = NULL; | |
846 | int r; | |
847 | ||
848 | fn = strjoin(new_name, suffix); | |
849 | if (!fn) | |
850 | return -ENOMEM; | |
851 | ||
852 | r = file_in_same_dir(path, fn, &rs); | |
853 | if (r < 0) | |
854 | return r; | |
855 | ||
856 | return copy_file_atomic(path, rs, 0664, COPY_REFLINK); | |
857 | } | |
858 | ||
859 | int image_clone(Image *i, const char *new_name, bool read_only) { | |
860 | _cleanup_(release_lock_file) LockFile name_lock = LOCK_FILE_INIT; | |
861 | _cleanup_strv_free_ char **settings = NULL; | |
862 | _cleanup_free_ char *roothash = NULL; | |
863 | const char *new_path; | |
864 | int r; | |
865 | ||
866 | assert(i); | |
867 | ||
868 | if (!image_name_is_valid(new_name)) | |
869 | return -EINVAL; | |
870 | ||
871 | settings = image_settings_path(i); | |
872 | if (!settings) | |
873 | return -ENOMEM; | |
874 | ||
875 | r = image_roothash_path(i, &roothash); | |
876 | if (r < 0) | |
877 | return r; | |
878 | ||
879 | /* Make sure nobody takes the new name, between the time we | |
880 | * checked it is currently unused in all search paths, and the | |
881 | * time we take possession of it */ | |
882 | r = image_name_lock(new_name, LOCK_EX|LOCK_NB, &name_lock); | |
883 | if (r < 0) | |
884 | return r; | |
885 | ||
886 | r = image_find(IMAGE_MACHINE, new_name, NULL, NULL); | |
887 | if (r >= 0) | |
888 | return -EEXIST; | |
889 | if (r != -ENOENT) | |
890 | return r; | |
891 | ||
892 | switch (i->type) { | |
893 | ||
894 | case IMAGE_SUBVOLUME: | |
895 | case IMAGE_DIRECTORY: | |
896 | /* If we can we'll always try to create a new btrfs subvolume here, even if the source is a plain | |
897 | * directory. */ | |
898 | ||
899 | new_path = strjoina("/var/lib/machines/", new_name); | |
900 | ||
901 | r = btrfs_subvol_snapshot(i->path, new_path, | |
902 | (read_only ? BTRFS_SNAPSHOT_READ_ONLY : 0) | | |
903 | BTRFS_SNAPSHOT_FALLBACK_COPY | | |
904 | BTRFS_SNAPSHOT_FALLBACK_DIRECTORY | | |
905 | BTRFS_SNAPSHOT_FALLBACK_IMMUTABLE | | |
906 | BTRFS_SNAPSHOT_RECURSIVE | | |
907 | BTRFS_SNAPSHOT_QUOTA); | |
908 | if (r >= 0) | |
909 | /* Enable "subtree" quotas for the copy, if we didn't copy any quota from the source. */ | |
910 | (void) btrfs_subvol_auto_qgroup(new_path, 0, true); | |
911 | ||
912 | break; | |
913 | ||
914 | case IMAGE_RAW: | |
915 | new_path = strjoina("/var/lib/machines/", new_name, ".raw"); | |
916 | ||
917 | r = copy_file_atomic_full(i->path, new_path, read_only ? 0444 : 0644, FS_NOCOW_FL, FS_NOCOW_FL, | |
918 | COPY_REFLINK|COPY_CRTIME, NULL, NULL); | |
919 | break; | |
920 | ||
921 | case IMAGE_BLOCK: | |
922 | default: | |
923 | return -EOPNOTSUPP; | |
924 | } | |
925 | ||
926 | if (r < 0) | |
927 | return r; | |
928 | ||
929 | STRV_FOREACH(j, settings) { | |
930 | r = clone_auxiliary_file(*j, new_name, ".nspawn"); | |
931 | if (r < 0 && r != -ENOENT) | |
932 | log_debug_errno(r, "Failed to clone settings %s, ignoring: %m", *j); | |
933 | } | |
934 | ||
935 | r = clone_auxiliary_file(roothash, new_name, ".roothash"); | |
936 | if (r < 0 && r != -ENOENT) | |
937 | log_debug_errno(r, "Failed to clone root hash file %s, ignoring: %m", roothash); | |
938 | ||
939 | return 0; | |
940 | } | |
941 | ||
942 | int image_read_only(Image *i, bool b) { | |
943 | _cleanup_(release_lock_file) LockFile global_lock = LOCK_FILE_INIT, local_lock = LOCK_FILE_INIT; | |
944 | int r; | |
945 | ||
946 | assert(i); | |
947 | ||
948 | if (IMAGE_IS_VENDOR(i) || IMAGE_IS_HOST(i)) | |
949 | return -EROFS; | |
950 | ||
951 | /* Make sure we don't interfere with a running nspawn */ | |
952 | r = image_path_lock(i->path, LOCK_EX|LOCK_NB, &global_lock, &local_lock); | |
953 | if (r < 0) | |
954 | return r; | |
955 | ||
956 | switch (i->type) { | |
957 | ||
958 | case IMAGE_SUBVOLUME: | |
959 | ||
960 | /* Note that we set the flag only on the top-level | |
961 | * subvolume of the image. */ | |
962 | ||
963 | r = btrfs_subvol_set_read_only(i->path, b); | |
964 | if (r < 0) | |
965 | return r; | |
966 | ||
967 | break; | |
968 | ||
969 | case IMAGE_DIRECTORY: | |
970 | /* For simple directory trees we cannot use the access | |
971 | mode of the top-level directory, since it has an | |
972 | effect on the container itself. However, we can | |
973 | use the "immutable" flag, to at least make the | |
974 | top-level directory read-only. It's not as good as | |
975 | a read-only subvolume, but at least something, and | |
976 | we can read the value back. */ | |
977 | ||
978 | r = chattr_path(i->path, b ? FS_IMMUTABLE_FL : 0, FS_IMMUTABLE_FL, NULL); | |
979 | if (r < 0) | |
980 | return r; | |
981 | ||
982 | break; | |
983 | ||
984 | case IMAGE_RAW: { | |
985 | struct stat st; | |
986 | ||
987 | if (stat(i->path, &st) < 0) | |
988 | return -errno; | |
989 | ||
990 | if (chmod(i->path, (st.st_mode & 0444) | (b ? 0000 : 0200)) < 0) | |
991 | return -errno; | |
992 | ||
993 | /* If the images is now read-only, it's a good time to | |
994 | * defrag it, given that no write patterns will | |
995 | * fragment it again. */ | |
996 | if (b) | |
997 | (void) btrfs_defrag(i->path); | |
998 | break; | |
999 | } | |
1000 | ||
1001 | case IMAGE_BLOCK: { | |
1002 | _cleanup_close_ int fd = -EBADF; | |
1003 | struct stat st; | |
1004 | int state = b; | |
1005 | ||
1006 | fd = open(i->path, O_CLOEXEC|O_RDONLY|O_NONBLOCK|O_NOCTTY); | |
1007 | if (fd < 0) | |
1008 | return -errno; | |
1009 | ||
1010 | if (fstat(fd, &st) < 0) | |
1011 | return -errno; | |
1012 | if (!S_ISBLK(st.st_mode)) | |
1013 | return -ENOTTY; | |
1014 | ||
1015 | if (ioctl(fd, BLKROSET, &state) < 0) | |
1016 | return -errno; | |
1017 | ||
1018 | break; | |
1019 | } | |
1020 | ||
1021 | default: | |
1022 | return -EOPNOTSUPP; | |
1023 | } | |
1024 | ||
1025 | return 0; | |
1026 | } | |
1027 | ||
1028 | int image_path_lock(const char *path, int operation, LockFile *global, LockFile *local) { | |
1029 | _cleanup_free_ char *p = NULL; | |
1030 | LockFile t = LOCK_FILE_INIT; | |
1031 | struct stat st; | |
1032 | bool exclusive; | |
1033 | int r; | |
1034 | ||
1035 | assert(path); | |
1036 | assert(global); | |
1037 | assert(local); | |
1038 | ||
1039 | /* Locks an image path. This actually creates two locks: one "local" one, next to the image path | |
1040 | * itself, which might be shared via NFS. And another "global" one, in /run, that uses the | |
1041 | * device/inode number. This has the benefit that we can even lock a tree that is a mount point, | |
1042 | * correctly. */ | |
1043 | ||
1044 | if (!path_is_absolute(path)) | |
1045 | return -EINVAL; | |
1046 | ||
1047 | switch (operation & (LOCK_SH|LOCK_EX)) { | |
1048 | case LOCK_SH: | |
1049 | exclusive = false; | |
1050 | break; | |
1051 | case LOCK_EX: | |
1052 | exclusive = true; | |
1053 | break; | |
1054 | default: | |
1055 | return -EINVAL; | |
1056 | } | |
1057 | ||
1058 | if (getenv_bool("SYSTEMD_NSPAWN_LOCK") == 0) { | |
1059 | *local = *global = (LockFile) LOCK_FILE_INIT; | |
1060 | return 0; | |
1061 | } | |
1062 | ||
1063 | /* Prohibit taking exclusive locks on the host image. We can't allow this, since we ourselves are | |
1064 | * running off it after all, and we don't want any images to manipulate the host image. We make an | |
1065 | * exception for shared locks however: we allow those (and make them NOPs since there's no point in | |
1066 | * taking them if there can't be exclusive locks). Strictly speaking these are questionable as well, | |
1067 | * since it means changes made to the host might propagate to the container as they happen (and a | |
1068 | * shared lock kinda suggests that no changes happen at all while it is in place), but it's too | |
1069 | * useful not to allow read-only containers off the host root, hence let's support this, and trust | |
1070 | * the user to do the right thing with this. */ | |
1071 | if (path_equal(path, "/")) { | |
1072 | if (exclusive) | |
1073 | return -EBUSY; | |
1074 | ||
1075 | *local = *global = (LockFile) LOCK_FILE_INIT; | |
1076 | return 0; | |
1077 | } | |
1078 | ||
1079 | if (stat(path, &st) >= 0) { | |
1080 | if (S_ISBLK(st.st_mode)) | |
1081 | r = asprintf(&p, "/run/systemd/nspawn/locks/block-%u:%u", major(st.st_rdev), minor(st.st_rdev)); | |
1082 | else if (S_ISDIR(st.st_mode) || S_ISREG(st.st_mode)) | |
1083 | r = asprintf(&p, "/run/systemd/nspawn/locks/inode-%lu:%lu", (unsigned long) st.st_dev, (unsigned long) st.st_ino); | |
1084 | else | |
1085 | return -ENOTTY; | |
1086 | if (r < 0) | |
1087 | return -ENOMEM; | |
1088 | } | |
1089 | ||
1090 | /* For block devices we don't need the "local" lock, as the major/minor lock above should be | |
1091 | * sufficient, since block devices are host local anyway. */ | |
1092 | if (!path_startswith(path, "/dev/")) { | |
1093 | r = make_lock_file_for(path, operation, &t); | |
1094 | if (r < 0) { | |
1095 | if (!exclusive && r == -EROFS) | |
1096 | log_debug_errno(r, "Failed to create shared lock for '%s', ignoring: %m", path); | |
1097 | else | |
1098 | return r; | |
1099 | } | |
1100 | } | |
1101 | ||
1102 | if (p) { | |
1103 | (void) mkdir_p("/run/systemd/nspawn/locks", 0700); | |
1104 | ||
1105 | r = make_lock_file(p, operation, global); | |
1106 | if (r < 0) { | |
1107 | release_lock_file(&t); | |
1108 | return r; | |
1109 | } | |
1110 | } else | |
1111 | *global = (LockFile) LOCK_FILE_INIT; | |
1112 | ||
1113 | *local = t; | |
1114 | return 0; | |
1115 | } | |
1116 | ||
1117 | int image_set_limit(Image *i, uint64_t referenced_max) { | |
1118 | assert(i); | |
1119 | ||
1120 | if (IMAGE_IS_VENDOR(i) || IMAGE_IS_HOST(i)) | |
1121 | return -EROFS; | |
1122 | ||
1123 | if (i->type != IMAGE_SUBVOLUME) | |
1124 | return -EOPNOTSUPP; | |
1125 | ||
1126 | /* We set the quota both for the subvolume as well as for the | |
1127 | * subtree. The latter is mostly for historical reasons, since | |
1128 | * we didn't use to have a concept of subtree quota, and hence | |
1129 | * only modified the subvolume quota. */ | |
1130 | ||
1131 | (void) btrfs_qgroup_set_limit(i->path, 0, referenced_max); | |
1132 | (void) btrfs_subvol_auto_qgroup(i->path, 0, true); | |
1133 | return btrfs_subvol_set_subtree_quota_limit(i->path, 0, referenced_max); | |
1134 | } | |
1135 | ||
1136 | int image_read_metadata(Image *i, const ImagePolicy *image_policy) { | |
1137 | _cleanup_(release_lock_file) LockFile global_lock = LOCK_FILE_INIT, local_lock = LOCK_FILE_INIT; | |
1138 | int r; | |
1139 | ||
1140 | assert(i); | |
1141 | ||
1142 | r = image_path_lock(i->path, LOCK_SH|LOCK_NB, &global_lock, &local_lock); | |
1143 | if (r < 0) | |
1144 | return r; | |
1145 | ||
1146 | switch (i->type) { | |
1147 | ||
1148 | case IMAGE_SUBVOLUME: | |
1149 | case IMAGE_DIRECTORY: { | |
1150 | _cleanup_strv_free_ char **machine_info = NULL, **os_release = NULL, **extension_release = NULL; | |
1151 | sd_id128_t machine_id = SD_ID128_NULL; | |
1152 | _cleanup_free_ char *hostname = NULL; | |
1153 | _cleanup_free_ char *path = NULL; | |
1154 | ||
1155 | if (i->class == IMAGE_EXTENSION) { | |
1156 | r = extension_has_forbidden_content(i->path); | |
1157 | if (r < 0) | |
1158 | return r; | |
1159 | if (r > 0) | |
1160 | return log_debug_errno(SYNTHETIC_ERRNO(ENOMEDIUM), | |
1161 | "Conflicting content found in image %s, refusing.", | |
1162 | i->name); | |
1163 | } | |
1164 | ||
1165 | r = chase("/etc/hostname", i->path, CHASE_PREFIX_ROOT|CHASE_TRAIL_SLASH, &path, NULL); | |
1166 | if (r < 0 && r != -ENOENT) | |
1167 | log_debug_errno(r, "Failed to chase /etc/hostname in image %s: %m", i->name); | |
1168 | else if (r >= 0) { | |
1169 | r = read_etc_hostname(path, &hostname); | |
1170 | if (r < 0) | |
1171 | log_debug_errno(errno, "Failed to read /etc/hostname of image %s: %m", i->name); | |
1172 | } | |
1173 | ||
1174 | path = mfree(path); | |
1175 | ||
1176 | r = id128_get_machine(i->path, &machine_id); | |
1177 | if (r < 0) | |
1178 | log_debug_errno(r, "Failed to read machine ID in image %s, ignoring: %m", i->name); | |
1179 | ||
1180 | r = chase("/etc/machine-info", i->path, CHASE_PREFIX_ROOT|CHASE_TRAIL_SLASH, &path, NULL); | |
1181 | if (r < 0 && r != -ENOENT) | |
1182 | log_debug_errno(r, "Failed to chase /etc/machine-info in image %s: %m", i->name); | |
1183 | else if (r >= 0) { | |
1184 | r = load_env_file_pairs(NULL, path, &machine_info); | |
1185 | if (r < 0) | |
1186 | log_debug_errno(r, "Failed to parse machine-info data of %s: %m", i->name); | |
1187 | } | |
1188 | ||
1189 | r = load_os_release_pairs(i->path, &os_release); | |
1190 | if (r < 0) | |
1191 | log_debug_errno(r, "Failed to read os-release in image, ignoring: %m"); | |
1192 | ||
1193 | r = load_extension_release_pairs(i->path, i->name, /* relax_extension_release_check= */ false, &extension_release); | |
1194 | if (r < 0) | |
1195 | log_debug_errno(r, "Failed to read extension-release in image, ignoring: %m"); | |
1196 | ||
1197 | free_and_replace(i->hostname, hostname); | |
1198 | i->machine_id = machine_id; | |
1199 | strv_free_and_replace(i->machine_info, machine_info); | |
1200 | strv_free_and_replace(i->os_release, os_release); | |
1201 | strv_free_and_replace(i->extension_release, extension_release); | |
1202 | ||
1203 | break; | |
1204 | } | |
1205 | ||
1206 | case IMAGE_RAW: | |
1207 | case IMAGE_BLOCK: { | |
1208 | _cleanup_(loop_device_unrefp) LoopDevice *d = NULL; | |
1209 | _cleanup_(dissected_image_unrefp) DissectedImage *m = NULL; | |
1210 | ||
1211 | r = loop_device_make_by_path(i->path, O_RDONLY, /* sector_size= */ UINT32_MAX, LO_FLAGS_PARTSCAN, LOCK_SH, &d); | |
1212 | if (r < 0) | |
1213 | return r; | |
1214 | ||
1215 | r = dissect_loop_device( | |
1216 | d, | |
1217 | /* verity= */ NULL, | |
1218 | /* mount_options= */ NULL, | |
1219 | image_policy, | |
1220 | DISSECT_IMAGE_GENERIC_ROOT | | |
1221 | DISSECT_IMAGE_REQUIRE_ROOT | | |
1222 | DISSECT_IMAGE_RELAX_VAR_CHECK | | |
1223 | DISSECT_IMAGE_READ_ONLY | | |
1224 | DISSECT_IMAGE_USR_NO_ROOT | | |
1225 | DISSECT_IMAGE_ADD_PARTITION_DEVICES | | |
1226 | DISSECT_IMAGE_PIN_PARTITION_DEVICES, | |
1227 | &m); | |
1228 | if (r < 0) | |
1229 | return r; | |
1230 | ||
1231 | r = dissected_image_acquire_metadata(m, | |
1232 | DISSECT_IMAGE_VALIDATE_OS | | |
1233 | DISSECT_IMAGE_VALIDATE_OS_EXT); | |
1234 | if (r < 0) | |
1235 | return r; | |
1236 | ||
1237 | free_and_replace(i->hostname, m->hostname); | |
1238 | i->machine_id = m->machine_id; | |
1239 | strv_free_and_replace(i->machine_info, m->machine_info); | |
1240 | strv_free_and_replace(i->os_release, m->os_release); | |
1241 | strv_free_and_replace(i->extension_release, m->extension_release); | |
1242 | ||
1243 | break; | |
1244 | } | |
1245 | ||
1246 | default: | |
1247 | return -EOPNOTSUPP; | |
1248 | } | |
1249 | ||
1250 | i->metadata_valid = true; | |
1251 | ||
1252 | return 0; | |
1253 | } | |
1254 | ||
1255 | int image_name_lock(const char *name, int operation, LockFile *ret) { | |
1256 | const char *p; | |
1257 | ||
1258 | assert(name); | |
1259 | assert(ret); | |
1260 | ||
1261 | /* Locks an image name, regardless of the precise path used. */ | |
1262 | ||
1263 | if (streq(name, ".host")) | |
1264 | return -EBUSY; | |
1265 | ||
1266 | if (!image_name_is_valid(name)) | |
1267 | return -EINVAL; | |
1268 | ||
1269 | if (getenv_bool("SYSTEMD_NSPAWN_LOCK") == 0) { | |
1270 | *ret = (LockFile) LOCK_FILE_INIT; | |
1271 | return 0; | |
1272 | } | |
1273 | ||
1274 | (void) mkdir_p("/run/systemd/nspawn/locks", 0700); | |
1275 | ||
1276 | p = strjoina("/run/systemd/nspawn/locks/name-", name); | |
1277 | return make_lock_file(p, operation, ret); | |
1278 | } | |
1279 | ||
1280 | bool image_in_search_path( | |
1281 | ImageClass class, | |
1282 | const char *root, | |
1283 | const char *image) { | |
1284 | ||
1285 | assert(image); | |
1286 | ||
1287 | NULSTR_FOREACH(path, image_search_path[class]) { | |
1288 | const char *p, *q; | |
1289 | size_t k; | |
1290 | ||
1291 | if (!empty_or_root(root)) { | |
1292 | q = path_startswith(path, root); | |
1293 | if (!q) | |
1294 | continue; | |
1295 | } else | |
1296 | q = path; | |
1297 | ||
1298 | p = path_startswith(q, path); | |
1299 | if (!p) | |
1300 | continue; | |
1301 | ||
1302 | /* Make sure there's a filename following */ | |
1303 | k = strcspn(p, "/"); | |
1304 | if (k == 0) | |
1305 | continue; | |
1306 | ||
1307 | p += k; | |
1308 | ||
1309 | /* Accept trailing slashes */ | |
1310 | if (p[strspn(p, "/")] == 0) | |
1311 | return true; | |
1312 | ||
1313 | } | |
1314 | ||
1315 | return false; | |
1316 | } | |
1317 | ||
1318 | static const char* const image_type_table[_IMAGE_TYPE_MAX] = { | |
1319 | [IMAGE_DIRECTORY] = "directory", | |
1320 | [IMAGE_SUBVOLUME] = "subvolume", | |
1321 | [IMAGE_RAW] = "raw", | |
1322 | [IMAGE_BLOCK] = "block", | |
1323 | }; | |
1324 | ||
1325 | DEFINE_STRING_TABLE_LOOKUP(image_type, ImageType); | |
1326 | ||
1327 | static const char* const image_class_table[_IMAGE_CLASS_MAX] = { | |
1328 | [IMAGE_MACHINE] = "machine", | |
1329 | [IMAGE_PORTABLE] = "portable", | |
1330 | [IMAGE_EXTENSION] = "extension", | |
1331 | }; | |
1332 | ||
1333 | DEFINE_STRING_TABLE_LOOKUP(image_class, ImageClass); |