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Commit | Line | Data |
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53e1b683 | 1 | /* SPDX-License-Identifier: LGPL-2.1+ */ |
cd61c3bf LP |
2 | /*** |
3 | This file is part of systemd. | |
4 | ||
5 | Copyright 2013 Lennart Poettering | |
cd61c3bf LP |
6 | ***/ |
7 | ||
a8fbdf54 TA |
8 | #include <dirent.h> |
9 | #include <errno.h> | |
ebd93cb6 | 10 | #include <fcntl.h> |
a8fbdf54 TA |
11 | #include <stdio.h> |
12 | #include <stdlib.h> | |
13 | #include <string.h> | |
e306723e | 14 | #include <sys/file.h> |
a8fbdf54 TA |
15 | #include <sys/stat.h> |
16 | #include <unistd.h> | |
8e0b6570 | 17 | #include <linux/fs.h> |
546dbec5 | 18 | |
b5efdb8a | 19 | #include "alloc-util.h" |
cd61c3bf | 20 | #include "btrfs-util.h" |
c8b3094d | 21 | #include "chattr-util.h" |
ebd93cb6 | 22 | #include "copy.h" |
a0956174 | 23 | #include "dirent-util.h" |
c7664c07 | 24 | #include "dissect-image.h" |
b6e953f2 | 25 | #include "env-util.h" |
3ffd4af2 | 26 | #include "fd-util.h" |
c7664c07 | 27 | #include "fileio.h" |
f4f15635 | 28 | #include "fs-util.h" |
a8fbdf54 | 29 | #include "hashmap.h" |
c7664c07 LP |
30 | #include "hostname-util.h" |
31 | #include "id128-util.h" | |
a8fbdf54 TA |
32 | #include "lockfile-util.h" |
33 | #include "log.h" | |
c7664c07 | 34 | #include "loop-util.h" |
3ffd4af2 | 35 | #include "machine-image.h" |
546dbec5 | 36 | #include "macro.h" |
30535c16 | 37 | #include "mkdir.h" |
d58ad743 | 38 | #include "os-util.h" |
8e0b6570 | 39 | #include "path-util.h" |
c6878637 | 40 | #include "rm-rf.h" |
8b43440b | 41 | #include "string-table.h" |
07630cea | 42 | #include "string-util.h" |
8e0b6570 | 43 | #include "strv.h" |
a8fbdf54 | 44 | #include "time-util.h" |
8e0b6570 | 45 | #include "utf8.h" |
a8fbdf54 | 46 | #include "util.h" |
89a5a90c | 47 | #include "xattr-util.h" |
cd61c3bf | 48 | |
5ef46e5f | 49 | static const char* const image_search_path[_IMAGE_CLASS_MAX] = { |
ace9ab19 LP |
50 | [IMAGE_MACHINE] = "/etc/machines\0" /* only place symlinks here */ |
51 | "/run/machines\0" /* and here too */ | |
52 | "/var/lib/machines\0" /* the main place for images */ | |
53 | "/var/lib/container\0" /* legacy */ | |
5ef46e5f LP |
54 | "/usr/local/lib/machines\0" |
55 | "/usr/lib/machines\0", | |
56 | ||
ace9ab19 LP |
57 | [IMAGE_PORTABLE] = "/etc/portables\0" /* only place symlinks here */ |
58 | "/run/portables\0" /* and here too */ | |
59 | "/var/lib/portables\0" /* the main place for images */ | |
5ef46e5f LP |
60 | "/usr/local/lib/portables\0" |
61 | "/usr/lib/portables\0", | |
62 | }; | |
c2ce6a3d | 63 | |
cd61c3bf LP |
64 | Image *image_unref(Image *i) { |
65 | if (!i) | |
66 | return NULL; | |
67 | ||
9614bb06 LP |
68 | assert(i->n_ref > 0); |
69 | i->n_ref--; | |
70 | ||
71 | if (i->n_ref > 0) | |
72 | return NULL; | |
73 | ||
cd61c3bf LP |
74 | free(i->name); |
75 | free(i->path); | |
c7664c07 LP |
76 | |
77 | free(i->hostname); | |
78 | strv_free(i->machine_info); | |
79 | strv_free(i->os_release); | |
80 | ||
6b430fdb | 81 | return mfree(i); |
cd61c3bf LP |
82 | } |
83 | ||
9614bb06 LP |
84 | Image *image_ref(Image *i) { |
85 | if (!i) | |
86 | return NULL; | |
87 | ||
88 | assert(i->n_ref > 0); | |
89 | i->n_ref++; | |
90 | ||
91 | return i; | |
92 | } | |
93 | ||
8e0b6570 LP |
94 | static char **image_settings_path(Image *image) { |
95 | _cleanup_strv_free_ char **l = NULL; | |
8e0b6570 LP |
96 | const char *fn, *s; |
97 | unsigned i = 0; | |
98 | ||
99 | assert(image); | |
100 | ||
101 | l = new0(char*, 4); | |
102 | if (!l) | |
103 | return NULL; | |
104 | ||
105 | fn = strjoina(image->name, ".nspawn"); | |
106 | ||
107 | FOREACH_STRING(s, "/etc/systemd/nspawn/", "/run/systemd/nspawn/") { | |
108 | l[i] = strappend(s, fn); | |
109 | if (!l[i]) | |
110 | return NULL; | |
111 | ||
112 | i++; | |
113 | } | |
114 | ||
115 | l[i] = file_in_same_dir(image->path, fn); | |
116 | if (!l[i]) | |
117 | return NULL; | |
118 | ||
ae2a15bc | 119 | return TAKE_PTR(l); |
8e0b6570 LP |
120 | } |
121 | ||
bafbac4e LP |
122 | static char *image_roothash_path(Image *image) { |
123 | const char *fn; | |
124 | ||
125 | assert(image); | |
126 | ||
127 | fn = strjoina(image->name, ".roothash"); | |
128 | ||
129 | return file_in_same_dir(image->path, fn); | |
130 | } | |
131 | ||
c2ce6a3d | 132 | static int image_new( |
cd61c3bf | 133 | ImageType t, |
5fc7f358 | 134 | const char *pretty, |
cd61c3bf | 135 | const char *path, |
5fc7f358 | 136 | const char *filename, |
cd61c3bf | 137 | bool read_only, |
10f9c755 | 138 | usec_t crtime, |
cd61c3bf | 139 | usec_t mtime, |
c2ce6a3d | 140 | Image **ret) { |
cd61c3bf LP |
141 | |
142 | _cleanup_(image_unrefp) Image *i = NULL; | |
cd61c3bf | 143 | |
cd61c3bf LP |
144 | assert(t >= 0); |
145 | assert(t < _IMAGE_TYPE_MAX); | |
5fc7f358 LP |
146 | assert(pretty); |
147 | assert(filename); | |
c2ce6a3d | 148 | assert(ret); |
cd61c3bf | 149 | |
c2ce6a3d | 150 | i = new0(Image, 1); |
cd61c3bf LP |
151 | if (!i) |
152 | return -ENOMEM; | |
153 | ||
9614bb06 | 154 | i->n_ref = 1; |
cd61c3bf LP |
155 | i->type = t; |
156 | i->read_only = read_only; | |
10f9c755 | 157 | i->crtime = crtime; |
cd61c3bf | 158 | i->mtime = mtime; |
c19de711 | 159 | i->usage = i->usage_exclusive = (uint64_t) -1; |
b6b18498 | 160 | i->limit = i->limit_exclusive = (uint64_t) -1; |
cd61c3bf | 161 | |
5fc7f358 | 162 | i->name = strdup(pretty); |
cd61c3bf LP |
163 | if (!i->name) |
164 | return -ENOMEM; | |
165 | ||
5fc7f358 | 166 | if (path) |
605405c6 | 167 | i->path = strjoin(path, "/", filename); |
5fc7f358 LP |
168 | else |
169 | i->path = strdup(filename); | |
5fc7f358 LP |
170 | if (!i->path) |
171 | return -ENOMEM; | |
172 | ||
173 | path_kill_slashes(i->path); | |
cd61c3bf | 174 | |
1cc6c93a | 175 | *ret = TAKE_PTR(i); |
c2ce6a3d | 176 | |
cd61c3bf LP |
177 | return 0; |
178 | } | |
179 | ||
4756c94e LP |
180 | static int extract_pretty(const char *path, const char *suffix, char **ret) { |
181 | _cleanup_free_ char *name = NULL; | |
182 | const char *p; | |
183 | size_t n; | |
184 | ||
185 | assert(path); | |
186 | assert(ret); | |
187 | ||
188 | p = last_path_component(path); | |
189 | n = strcspn(p, "/"); | |
190 | ||
191 | name = strndup(p, n); | |
192 | if (!name) | |
193 | return -ENOMEM; | |
194 | ||
195 | if (suffix) { | |
196 | char *e; | |
197 | ||
198 | e = endswith(name, suffix); | |
199 | if (!e) | |
200 | return -EINVAL; | |
201 | ||
202 | *e = 0; | |
203 | } | |
204 | ||
205 | if (!image_name_is_valid(name)) | |
206 | return -EINVAL; | |
207 | ||
208 | *ret = TAKE_PTR(name); | |
209 | return 0; | |
210 | } | |
211 | ||
5fc7f358 LP |
212 | static int image_make( |
213 | const char *pretty, | |
214 | int dfd, | |
215 | const char *path, | |
216 | const char *filename, | |
3a6ce860 | 217 | const struct stat *st, |
5fc7f358 LP |
218 | Image **ret) { |
219 | ||
4756c94e | 220 | _cleanup_free_ char *pretty_buffer = NULL; |
3a6ce860 | 221 | struct stat stbuf; |
5fc7f358 | 222 | bool read_only; |
cd61c3bf LP |
223 | int r; |
224 | ||
3a6ce860 | 225 | assert(dfd >= 0 || dfd == AT_FDCWD); |
5fc7f358 | 226 | assert(filename); |
cd61c3bf | 227 | |
eb38edce | 228 | /* We explicitly *do* follow symlinks here, since we want to allow symlinking trees, raw files and block |
3a6ce860 LP |
229 | * devices into /var/lib/machines/, and treat them normally. |
230 | * | |
231 | * This function returns -ENOENT if we can't find the image after all, and -EMEDIUMTYPE if it's not a file we | |
232 | * recognize. */ | |
cd61c3bf | 233 | |
3a6ce860 LP |
234 | if (!st) { |
235 | if (fstatat(dfd, filename, &stbuf, 0) < 0) | |
236 | return -errno; | |
237 | ||
238 | st = &stbuf; | |
239 | } | |
cd61c3bf | 240 | |
5fc7f358 LP |
241 | read_only = |
242 | (path && path_startswith(path, "/usr")) || | |
08ff5529 | 243 | (faccessat(dfd, filename, W_OK, AT_EACCESS) < 0 && errno == EROFS); |
86e339c8 | 244 | |
3a6ce860 | 245 | if (S_ISDIR(st->st_mode)) { |
01b72568 LP |
246 | _cleanup_close_ int fd = -1; |
247 | unsigned file_attr = 0; | |
cd61c3bf | 248 | |
c2ce6a3d | 249 | if (!ret) |
3a6ce860 | 250 | return 0; |
cd61c3bf | 251 | |
4756c94e LP |
252 | if (!pretty) { |
253 | r = extract_pretty(filename, NULL, &pretty_buffer); | |
254 | if (r < 0) | |
255 | return r; | |
256 | ||
257 | pretty = pretty_buffer; | |
258 | } | |
5fc7f358 | 259 | |
01b72568 LP |
260 | fd = openat(dfd, filename, O_CLOEXEC|O_NOCTTY|O_DIRECTORY); |
261 | if (fd < 0) | |
262 | return -errno; | |
263 | ||
c2ce6a3d | 264 | /* btrfs subvolumes have inode 256 */ |
3a6ce860 | 265 | if (st->st_ino == 256) { |
cd61c3bf | 266 | |
21222ea5 LP |
267 | r = btrfs_is_filesystem(fd); |
268 | if (r < 0) | |
269 | return r; | |
270 | if (r) { | |
10f9c755 | 271 | BtrfsSubvolInfo info; |
cd61c3bf | 272 | |
c2ce6a3d | 273 | /* It's a btrfs subvolume */ |
cd61c3bf | 274 | |
5bcd08db | 275 | r = btrfs_subvol_get_info_fd(fd, 0, &info); |
10f9c755 LP |
276 | if (r < 0) |
277 | return r; | |
c2ce6a3d LP |
278 | |
279 | r = image_new(IMAGE_SUBVOLUME, | |
5fc7f358 | 280 | pretty, |
c2ce6a3d | 281 | path, |
5fc7f358 LP |
282 | filename, |
283 | info.read_only || read_only, | |
10f9c755 | 284 | info.otime, |
c2ce6a3d | 285 | 0, |
c2ce6a3d LP |
286 | ret); |
287 | if (r < 0) | |
288 | return r; | |
289 | ||
5bcd08db LP |
290 | if (btrfs_quota_scan_ongoing(fd) == 0) { |
291 | BtrfsQuotaInfo quota; | |
b6b18498 | 292 | |
5bcd08db LP |
293 | r = btrfs_subvol_get_subtree_quota_fd(fd, 0, "a); |
294 | if (r >= 0) { | |
295 | (*ret)->usage = quota.referenced; | |
296 | (*ret)->usage_exclusive = quota.exclusive; | |
297 | ||
298 | (*ret)->limit = quota.referenced_max; | |
299 | (*ret)->limit_exclusive = quota.exclusive_max; | |
300 | } | |
b6b18498 LP |
301 | } |
302 | ||
3a6ce860 | 303 | return 0; |
cd61c3bf | 304 | } |
c2ce6a3d | 305 | } |
cd61c3bf | 306 | |
01b72568 LP |
307 | /* If the IMMUTABLE bit is set, we consider the |
308 | * directory read-only. Since the ioctl is not | |
309 | * supported everywhere we ignore failures. */ | |
310 | (void) read_attr_fd(fd, &file_attr); | |
cd61c3bf | 311 | |
01b72568 | 312 | /* It's just a normal directory. */ |
c2ce6a3d | 313 | r = image_new(IMAGE_DIRECTORY, |
5fc7f358 | 314 | pretty, |
c2ce6a3d | 315 | path, |
5fc7f358 | 316 | filename, |
01b72568 | 317 | read_only || (file_attr & FS_IMMUTABLE_FL), |
c2ce6a3d LP |
318 | 0, |
319 | 0, | |
320 | ret); | |
321 | if (r < 0) | |
322 | return r; | |
cd61c3bf | 323 | |
3a6ce860 | 324 | return 0; |
cd61c3bf | 325 | |
3a6ce860 | 326 | } else if (S_ISREG(st->st_mode) && endswith(filename, ".raw")) { |
10f9c755 | 327 | usec_t crtime = 0; |
cd61c3bf | 328 | |
aceac2f0 | 329 | /* It's a RAW disk image */ |
cd61c3bf | 330 | |
c2ce6a3d | 331 | if (!ret) |
3a6ce860 | 332 | return 0; |
cd61c3bf | 333 | |
4756c94e | 334 | (void) fd_getcrtime_at(dfd, filename, &crtime, 0); |
10f9c755 | 335 | |
4756c94e LP |
336 | if (!pretty) { |
337 | r = extract_pretty(filename, ".raw", &pretty_buffer); | |
338 | if (r < 0) | |
339 | return r; | |
340 | ||
341 | pretty = pretty_buffer; | |
342 | } | |
10f9c755 | 343 | |
aceac2f0 | 344 | r = image_new(IMAGE_RAW, |
5fc7f358 | 345 | pretty, |
c2ce6a3d | 346 | path, |
5fc7f358 | 347 | filename, |
3a6ce860 | 348 | !(st->st_mode & 0222) || read_only, |
10f9c755 | 349 | crtime, |
3a6ce860 | 350 | timespec_load(&st->st_mtim), |
c2ce6a3d LP |
351 | ret); |
352 | if (r < 0) | |
353 | return r; | |
cd61c3bf | 354 | |
3a6ce860 LP |
355 | (*ret)->usage = (*ret)->usage_exclusive = st->st_blocks * 512; |
356 | (*ret)->limit = (*ret)->limit_exclusive = st->st_size; | |
b6b18498 | 357 | |
3a6ce860 | 358 | return 0; |
eb38edce | 359 | |
3a6ce860 | 360 | } else if (S_ISBLK(st->st_mode)) { |
eb38edce LP |
361 | _cleanup_close_ int block_fd = -1; |
362 | uint64_t size = UINT64_MAX; | |
363 | ||
364 | /* A block device */ | |
365 | ||
366 | if (!ret) | |
3a6ce860 | 367 | return 0; |
eb38edce | 368 | |
4756c94e LP |
369 | if (!pretty) { |
370 | r = extract_pretty(filename, NULL, &pretty_buffer); | |
371 | if (r < 0) | |
372 | return r; | |
373 | ||
374 | pretty = pretty_buffer; | |
375 | } | |
eb38edce LP |
376 | |
377 | block_fd = openat(dfd, filename, O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_NOCTTY); | |
378 | if (block_fd < 0) | |
379 | log_debug_errno(errno, "Failed to open block device %s/%s, ignoring: %m", path, filename); | |
380 | else { | |
3a6ce860 LP |
381 | /* Refresh stat data after opening the node */ |
382 | if (fstat(block_fd, &stbuf) < 0) | |
eb38edce | 383 | return -errno; |
3a6ce860 LP |
384 | st = &stbuf; |
385 | ||
386 | if (!S_ISBLK(st->st_mode)) /* Verify that what we opened is actually what we think it is */ | |
eb38edce LP |
387 | return -ENOTTY; |
388 | ||
389 | if (!read_only) { | |
390 | int state = 0; | |
391 | ||
392 | if (ioctl(block_fd, BLKROGET, &state) < 0) | |
393 | log_debug_errno(errno, "Failed to issue BLKROGET on device %s/%s, ignoring: %m", path, filename); | |
394 | else if (state) | |
395 | read_only = true; | |
396 | } | |
397 | ||
398 | if (ioctl(block_fd, BLKGETSIZE64, &size) < 0) | |
4c2e654b | 399 | log_debug_errno(errno, "Failed to issue BLKGETSIZE64 on device %s/%s, ignoring: %m", path, filename); |
eb38edce LP |
400 | |
401 | block_fd = safe_close(block_fd); | |
402 | } | |
403 | ||
404 | r = image_new(IMAGE_BLOCK, | |
405 | pretty, | |
406 | path, | |
407 | filename, | |
3a6ce860 | 408 | !(st->st_mode & 0222) || read_only, |
eb38edce LP |
409 | 0, |
410 | 0, | |
411 | ret); | |
412 | if (r < 0) | |
413 | return r; | |
414 | ||
415 | if (size != 0 && size != UINT64_MAX) | |
416 | (*ret)->usage = (*ret)->usage_exclusive = (*ret)->limit = (*ret)->limit_exclusive = size; | |
417 | ||
3a6ce860 | 418 | return 0; |
c2ce6a3d | 419 | } |
cd61c3bf | 420 | |
3a6ce860 | 421 | return -EMEDIUMTYPE; |
c2ce6a3d | 422 | } |
cd61c3bf | 423 | |
5ef46e5f | 424 | int image_find(ImageClass class, const char *name, Image **ret) { |
c2ce6a3d LP |
425 | const char *path; |
426 | int r; | |
cd61c3bf | 427 | |
5ef46e5f LP |
428 | assert(class >= 0); |
429 | assert(class < _IMAGE_CLASS_MAX); | |
c2ce6a3d | 430 | assert(name); |
cd61c3bf | 431 | |
c2ce6a3d LP |
432 | /* There are no images with invalid names */ |
433 | if (!image_name_is_valid(name)) | |
3a6ce860 | 434 | return -ENOENT; |
cd61c3bf | 435 | |
5ef46e5f | 436 | NULSTR_FOREACH(path, image_search_path[class]) { |
c2ce6a3d | 437 | _cleanup_closedir_ DIR *d = NULL; |
3a6ce860 | 438 | struct stat st; |
cd61c3bf | 439 | |
c2ce6a3d LP |
440 | d = opendir(path); |
441 | if (!d) { | |
442 | if (errno == ENOENT) | |
443 | continue; | |
cd61c3bf | 444 | |
c2ce6a3d LP |
445 | return -errno; |
446 | } | |
cd61c3bf | 447 | |
3a6ce860 LP |
448 | /* As mentioned above, we follow symlinks on this fstatat(), because we want to permit people to |
449 | * symlink block devices into the search path */ | |
450 | if (fstatat(dirfd(d), name, &st, 0) < 0) { | |
aceac2f0 | 451 | _cleanup_free_ char *raw = NULL; |
5fc7f358 | 452 | |
3a6ce860 LP |
453 | if (errno != ENOENT) |
454 | return -errno; | |
455 | ||
aceac2f0 LP |
456 | raw = strappend(name, ".raw"); |
457 | if (!raw) | |
5fc7f358 LP |
458 | return -ENOMEM; |
459 | ||
3a6ce860 LP |
460 | if (fstatat(dirfd(d), raw, &st, 0) < 0) { |
461 | ||
462 | if (errno == ENOENT) | |
463 | continue; | |
464 | ||
465 | return -errno; | |
466 | } | |
467 | ||
468 | if (!S_ISREG(st.st_mode)) | |
5fc7f358 | 469 | continue; |
3a6ce860 LP |
470 | |
471 | r = image_make(name, dirfd(d), path, raw, &st, ret); | |
472 | ||
473 | } else { | |
474 | if (!S_ISDIR(st.st_mode) && !S_ISBLK(st.st_mode)) | |
475 | continue; | |
476 | ||
477 | r = image_make(name, dirfd(d), path, name, &st, ret); | |
5fc7f358 | 478 | } |
3a6ce860 LP |
479 | if (IN_SET(r, -ENOENT, -EMEDIUMTYPE)) |
480 | continue; | |
c2ce6a3d LP |
481 | if (r < 0) |
482 | return r; | |
cd61c3bf | 483 | |
cf604fd4 LP |
484 | if (ret) |
485 | (*ret)->discoverable = true; | |
486 | ||
c2ce6a3d LP |
487 | return 1; |
488 | } | |
489 | ||
cf604fd4 LP |
490 | if (class == IMAGE_MACHINE && streq(name, ".host")) { |
491 | r = image_make(".host", AT_FDCWD, NULL, "/", NULL, ret); | |
492 | if (r < 0) | |
493 | return r; | |
494 | ||
495 | if (ret) | |
496 | (*ret)->discoverable = true; | |
497 | ||
498 | return r; | |
499 | } | |
5fc7f358 | 500 | |
3a6ce860 | 501 | return -ENOENT; |
c2ce6a3d LP |
502 | }; |
503 | ||
2ddf182b | 504 | int image_from_path(const char *path, Image **ret) { |
cf604fd4 LP |
505 | |
506 | /* Note that we don't set the 'discoverable' field of the returned object, because we don't check here whether | |
507 | * the image is in the image search path. And if it is we don't know if the path we used is actually not | |
508 | * overriden by another, different image earlier in the search path */ | |
509 | ||
2ddf182b LP |
510 | if (path_equal(path, "/")) |
511 | return image_make(".host", AT_FDCWD, NULL, "/", NULL, ret); | |
512 | ||
513 | return image_make(NULL, AT_FDCWD, NULL, path, NULL, ret); | |
514 | } | |
515 | ||
516 | int image_find_harder(ImageClass class, const char *name_or_path, Image **ret) { | |
517 | if (image_name_is_valid(name_or_path)) | |
518 | return image_find(class, name_or_path, ret); | |
519 | ||
520 | return image_from_path(name_or_path, ret); | |
521 | } | |
522 | ||
5ef46e5f | 523 | int image_discover(ImageClass class, Hashmap *h) { |
c2ce6a3d LP |
524 | const char *path; |
525 | int r; | |
526 | ||
5ef46e5f LP |
527 | assert(class >= 0); |
528 | assert(class < _IMAGE_CLASS_MAX); | |
c2ce6a3d LP |
529 | assert(h); |
530 | ||
5ef46e5f | 531 | NULSTR_FOREACH(path, image_search_path[class]) { |
c2ce6a3d LP |
532 | _cleanup_closedir_ DIR *d = NULL; |
533 | struct dirent *de; | |
534 | ||
535 | d = opendir(path); | |
536 | if (!d) { | |
537 | if (errno == ENOENT) | |
a67a4c8c | 538 | continue; |
c2ce6a3d LP |
539 | |
540 | return -errno; | |
541 | } | |
542 | ||
543 | FOREACH_DIRENT_ALL(de, d, return -errno) { | |
544 | _cleanup_(image_unrefp) Image *image = NULL; | |
1bf36bf9 | 545 | _cleanup_free_ char *truncated = NULL; |
3a6ce860 LP |
546 | const char *pretty; |
547 | struct stat st; | |
c2ce6a3d | 548 | |
1bf36bf9 | 549 | if (dot_or_dot_dot(de->d_name)) |
c2ce6a3d LP |
550 | continue; |
551 | ||
3a6ce860 LP |
552 | /* As mentioned above, we follow symlinks on this fstatat(), because we want to permit people |
553 | * to symlink block devices into the search path */ | |
554 | if (fstatat(dirfd(d), de->d_name, &st, 0) < 0) { | |
555 | if (errno == ENOENT) | |
556 | continue; | |
557 | ||
558 | return -errno; | |
559 | } | |
560 | ||
561 | if (S_ISREG(st.st_mode)) { | |
562 | const char *e; | |
563 | ||
564 | e = endswith(de->d_name, ".raw"); | |
565 | if (!e) | |
566 | continue; | |
567 | ||
1bf36bf9 LP |
568 | truncated = strndup(de->d_name, e - de->d_name); |
569 | if (!truncated) | |
570 | return -ENOMEM; | |
571 | ||
572 | pretty = truncated; | |
3a6ce860 | 573 | } else if (S_ISDIR(st.st_mode) || S_ISBLK(st.st_mode)) |
1bf36bf9 | 574 | pretty = de->d_name; |
3a6ce860 LP |
575 | else |
576 | continue; | |
1bf36bf9 LP |
577 | |
578 | if (!image_name_is_valid(pretty)) | |
579 | continue; | |
580 | ||
581 | if (hashmap_contains(h, pretty)) | |
c2ce6a3d LP |
582 | continue; |
583 | ||
3a6ce860 LP |
584 | r = image_make(pretty, dirfd(d), path, de->d_name, &st, &image); |
585 | if (IN_SET(r, -ENOENT, -EMEDIUMTYPE)) | |
c2ce6a3d LP |
586 | continue; |
587 | if (r < 0) | |
588 | return r; | |
589 | ||
cf604fd4 LP |
590 | image->discoverable = true; |
591 | ||
c2ce6a3d LP |
592 | r = hashmap_put(h, image->name, image); |
593 | if (r < 0) | |
594 | return r; | |
595 | ||
596 | image = NULL; | |
cd61c3bf LP |
597 | } |
598 | } | |
599 | ||
5ef46e5f | 600 | if (class == IMAGE_MACHINE && !hashmap_contains(h, ".host")) { |
5fc7f358 LP |
601 | _cleanup_(image_unrefp) Image *image = NULL; |
602 | ||
3a6ce860 | 603 | r = image_make(".host", AT_FDCWD, NULL, "/", NULL, &image); |
5fc7f358 LP |
604 | if (r < 0) |
605 | return r; | |
606 | ||
cf604fd4 LP |
607 | image->discoverable = true; |
608 | ||
5fc7f358 LP |
609 | r = hashmap_put(h, image->name, image); |
610 | if (r < 0) | |
611 | return r; | |
612 | ||
613 | image = NULL; | |
5fc7f358 LP |
614 | } |
615 | ||
cd61c3bf LP |
616 | return 0; |
617 | } | |
618 | ||
08682124 | 619 | int image_remove(Image *i) { |
8e766630 | 620 | _cleanup_(release_lock_file) LockFile global_lock = LOCK_FILE_INIT, local_lock = LOCK_FILE_INIT; |
8e0b6570 | 621 | _cleanup_strv_free_ char **settings = NULL; |
bafbac4e | 622 | _cleanup_free_ char *roothash = NULL; |
8e0b6570 | 623 | char **j; |
30535c16 LP |
624 | int r; |
625 | ||
08682124 LP |
626 | assert(i); |
627 | ||
d94c2b06 | 628 | if (IMAGE_IS_VENDOR(i) || IMAGE_IS_HOST(i)) |
08682124 LP |
629 | return -EROFS; |
630 | ||
8e0b6570 LP |
631 | settings = image_settings_path(i); |
632 | if (!settings) | |
633 | return -ENOMEM; | |
634 | ||
bafbac4e LP |
635 | roothash = image_roothash_path(i); |
636 | if (!roothash) | |
637 | return -ENOMEM; | |
638 | ||
30535c16 LP |
639 | /* Make sure we don't interfere with a running nspawn */ |
640 | r = image_path_lock(i->path, LOCK_EX|LOCK_NB, &global_lock, &local_lock); | |
641 | if (r < 0) | |
642 | return r; | |
643 | ||
ebd93cb6 LP |
644 | switch (i->type) { |
645 | ||
646 | case IMAGE_SUBVOLUME: | |
9fb0b9c7 LP |
647 | |
648 | /* Let's unlink first, maybe it is a symlink? If that works we are happy. Otherwise, let's get out the | |
649 | * big guns */ | |
650 | if (unlink(i->path) < 0) { | |
651 | r = btrfs_subvol_remove(i->path, BTRFS_REMOVE_RECURSIVE|BTRFS_REMOVE_QUOTA); | |
652 | if (r < 0) | |
653 | return r; | |
654 | } | |
655 | ||
8e0b6570 | 656 | break; |
ebd93cb6 LP |
657 | |
658 | case IMAGE_DIRECTORY: | |
01b72568 | 659 | /* Allow deletion of read-only directories */ |
a67d68b8 | 660 | (void) chattr_path(i->path, 0, FS_IMMUTABLE_FL); |
8e0b6570 LP |
661 | r = rm_rf(i->path, REMOVE_ROOT|REMOVE_PHYSICAL|REMOVE_SUBVOLUME); |
662 | if (r < 0) | |
663 | return r; | |
664 | ||
665 | break; | |
01b72568 | 666 | |
eb38edce LP |
667 | case IMAGE_BLOCK: |
668 | ||
669 | /* If this is inside of /dev, then it's a real block device, hence let's not touch the device node | |
670 | * itself (but let's remove the stuff stored alongside it). If it's anywhere else, let's try to unlink | |
671 | * the thing (it's most likely a symlink after all). */ | |
672 | ||
673 | if (path_startswith(i->path, "/dev")) | |
674 | break; | |
675 | ||
4831981d | 676 | _fallthrough_; |
aceac2f0 | 677 | case IMAGE_RAW: |
41d1ed05 LP |
678 | if (unlink(i->path) < 0) |
679 | return -errno; | |
8e0b6570 | 680 | break; |
ebd93cb6 LP |
681 | |
682 | default: | |
15411c0c | 683 | return -EOPNOTSUPP; |
ebd93cb6 | 684 | } |
8e0b6570 LP |
685 | |
686 | STRV_FOREACH(j, settings) { | |
687 | if (unlink(*j) < 0 && errno != ENOENT) | |
688 | log_debug_errno(errno, "Failed to unlink %s, ignoring: %m", *j); | |
689 | } | |
690 | ||
bafbac4e LP |
691 | if (unlink(roothash) < 0 && errno != ENOENT) |
692 | log_debug_errno(errno, "Failed to unlink %s, ignoring: %m", roothash); | |
693 | ||
8e0b6570 LP |
694 | return 0; |
695 | } | |
696 | ||
bafbac4e | 697 | static int rename_auxiliary_file(const char *path, const char *new_name, const char *suffix) { |
8e0b6570 LP |
698 | _cleanup_free_ char *rs = NULL; |
699 | const char *fn; | |
700 | ||
bafbac4e | 701 | fn = strjoina(new_name, suffix); |
8e0b6570 LP |
702 | |
703 | rs = file_in_same_dir(path, fn); | |
704 | if (!rs) | |
705 | return -ENOMEM; | |
706 | ||
707 | return rename_noreplace(AT_FDCWD, path, AT_FDCWD, rs); | |
ebd93cb6 LP |
708 | } |
709 | ||
710 | int image_rename(Image *i, const char *new_name) { | |
8e766630 | 711 | _cleanup_(release_lock_file) LockFile global_lock = LOCK_FILE_INIT, local_lock = LOCK_FILE_INIT, name_lock = LOCK_FILE_INIT; |
bafbac4e | 712 | _cleanup_free_ char *new_path = NULL, *nn = NULL, *roothash = NULL; |
8e0b6570 | 713 | _cleanup_strv_free_ char **settings = NULL; |
01b72568 | 714 | unsigned file_attr = 0; |
8e0b6570 | 715 | char **j; |
ebd93cb6 LP |
716 | int r; |
717 | ||
718 | assert(i); | |
719 | ||
720 | if (!image_name_is_valid(new_name)) | |
721 | return -EINVAL; | |
722 | ||
d94c2b06 | 723 | if (IMAGE_IS_VENDOR(i) || IMAGE_IS_HOST(i)) |
ebd93cb6 LP |
724 | return -EROFS; |
725 | ||
8e0b6570 LP |
726 | settings = image_settings_path(i); |
727 | if (!settings) | |
728 | return -ENOMEM; | |
729 | ||
bafbac4e LP |
730 | roothash = image_roothash_path(i); |
731 | if (!roothash) | |
732 | return -ENOMEM; | |
733 | ||
30535c16 LP |
734 | /* Make sure we don't interfere with a running nspawn */ |
735 | r = image_path_lock(i->path, LOCK_EX|LOCK_NB, &global_lock, &local_lock); | |
736 | if (r < 0) | |
737 | return r; | |
738 | ||
739 | /* Make sure nobody takes the new name, between the time we | |
740 | * checked it is currently unused in all search paths, and the | |
f8e2f4d6 | 741 | * time we take possession of it */ |
30535c16 LP |
742 | r = image_name_lock(new_name, LOCK_EX|LOCK_NB, &name_lock); |
743 | if (r < 0) | |
744 | return r; | |
745 | ||
5ef46e5f | 746 | r = image_find(IMAGE_MACHINE, new_name, NULL); |
3a6ce860 | 747 | if (r >= 0) |
ebd93cb6 | 748 | return -EEXIST; |
3a6ce860 LP |
749 | if (r != -ENOENT) |
750 | return r; | |
ebd93cb6 LP |
751 | |
752 | switch (i->type) { | |
753 | ||
ebd93cb6 | 754 | case IMAGE_DIRECTORY: |
01b72568 LP |
755 | /* Turn of the immutable bit while we rename the image, so that we can rename it */ |
756 | (void) read_attr_path(i->path, &file_attr); | |
757 | ||
758 | if (file_attr & FS_IMMUTABLE_FL) | |
a67d68b8 | 759 | (void) chattr_path(i->path, 0, FS_IMMUTABLE_FL); |
01b72568 | 760 | |
4831981d | 761 | _fallthrough_; |
01b72568 | 762 | case IMAGE_SUBVOLUME: |
ebd93cb6 LP |
763 | new_path = file_in_same_dir(i->path, new_name); |
764 | break; | |
765 | ||
eb38edce LP |
766 | case IMAGE_BLOCK: |
767 | ||
768 | /* Refuse renaming raw block devices in /dev, the names are picked by udev after all. */ | |
769 | if (path_startswith(i->path, "/dev")) | |
770 | return -EROFS; | |
771 | ||
772 | new_path = file_in_same_dir(i->path, new_name); | |
773 | break; | |
774 | ||
aceac2f0 | 775 | case IMAGE_RAW: { |
ebd93cb6 LP |
776 | const char *fn; |
777 | ||
63c372cb | 778 | fn = strjoina(new_name, ".raw"); |
ebd93cb6 LP |
779 | new_path = file_in_same_dir(i->path, fn); |
780 | break; | |
781 | } | |
782 | ||
783 | default: | |
15411c0c | 784 | return -EOPNOTSUPP; |
ebd93cb6 LP |
785 | } |
786 | ||
787 | if (!new_path) | |
788 | return -ENOMEM; | |
789 | ||
790 | nn = strdup(new_name); | |
791 | if (!nn) | |
792 | return -ENOMEM; | |
793 | ||
f85ef957 AC |
794 | r = rename_noreplace(AT_FDCWD, i->path, AT_FDCWD, new_path); |
795 | if (r < 0) | |
796 | return r; | |
ebd93cb6 | 797 | |
01b72568 LP |
798 | /* Restore the immutable bit, if it was set before */ |
799 | if (file_attr & FS_IMMUTABLE_FL) | |
a67d68b8 | 800 | (void) chattr_path(new_path, FS_IMMUTABLE_FL, FS_IMMUTABLE_FL); |
01b72568 | 801 | |
f9ecfd3b DL |
802 | free_and_replace(i->path, new_path); |
803 | free_and_replace(i->name, nn); | |
ebd93cb6 | 804 | |
8e0b6570 | 805 | STRV_FOREACH(j, settings) { |
bafbac4e | 806 | r = rename_auxiliary_file(*j, new_name, ".nspawn"); |
8e0b6570 LP |
807 | if (r < 0 && r != -ENOENT) |
808 | log_debug_errno(r, "Failed to rename settings file %s, ignoring: %m", *j); | |
809 | } | |
810 | ||
bafbac4e LP |
811 | r = rename_auxiliary_file(roothash, new_name, ".roothash"); |
812 | if (r < 0 && r != -ENOENT) | |
813 | log_debug_errno(r, "Failed to rename roothash file %s, ignoring: %m", roothash); | |
814 | ||
ebd93cb6 LP |
815 | return 0; |
816 | } | |
817 | ||
bafbac4e | 818 | static int clone_auxiliary_file(const char *path, const char *new_name, const char *suffix) { |
8e0b6570 LP |
819 | _cleanup_free_ char *rs = NULL; |
820 | const char *fn; | |
821 | ||
bafbac4e | 822 | fn = strjoina(new_name, suffix); |
8e0b6570 LP |
823 | |
824 | rs = file_in_same_dir(path, fn); | |
825 | if (!rs) | |
826 | return -ENOMEM; | |
827 | ||
1c876927 | 828 | return copy_file_atomic(path, rs, 0664, 0, COPY_REFLINK); |
8e0b6570 LP |
829 | } |
830 | ||
ebd93cb6 | 831 | int image_clone(Image *i, const char *new_name, bool read_only) { |
8e766630 | 832 | _cleanup_(release_lock_file) LockFile name_lock = LOCK_FILE_INIT; |
8e0b6570 | 833 | _cleanup_strv_free_ char **settings = NULL; |
bafbac4e | 834 | _cleanup_free_ char *roothash = NULL; |
ebd93cb6 | 835 | const char *new_path; |
8e0b6570 | 836 | char **j; |
ebd93cb6 LP |
837 | int r; |
838 | ||
839 | assert(i); | |
840 | ||
841 | if (!image_name_is_valid(new_name)) | |
842 | return -EINVAL; | |
843 | ||
8e0b6570 LP |
844 | settings = image_settings_path(i); |
845 | if (!settings) | |
846 | return -ENOMEM; | |
847 | ||
bafbac4e LP |
848 | roothash = image_roothash_path(i); |
849 | if (!roothash) | |
850 | return -ENOMEM; | |
851 | ||
30535c16 LP |
852 | /* Make sure nobody takes the new name, between the time we |
853 | * checked it is currently unused in all search paths, and the | |
f8e2f4d6 | 854 | * time we take possession of it */ |
30535c16 LP |
855 | r = image_name_lock(new_name, LOCK_EX|LOCK_NB, &name_lock); |
856 | if (r < 0) | |
857 | return r; | |
858 | ||
5ef46e5f | 859 | r = image_find(IMAGE_MACHINE, new_name, NULL); |
3a6ce860 | 860 | if (r >= 0) |
ebd93cb6 | 861 | return -EEXIST; |
3a6ce860 LP |
862 | if (r != -ENOENT) |
863 | return r; | |
ebd93cb6 LP |
864 | |
865 | switch (i->type) { | |
866 | ||
867 | case IMAGE_SUBVOLUME: | |
868 | case IMAGE_DIRECTORY: | |
9a50e3ca | 869 | /* If we can we'll always try to create a new btrfs subvolume here, even if the source is a plain |
13e785f7 | 870 | * directory. */ |
9a50e3ca | 871 | |
63c372cb | 872 | new_path = strjoina("/var/lib/machines/", new_name); |
ebd93cb6 | 873 | |
17cbb288 LP |
874 | r = btrfs_subvol_snapshot(i->path, new_path, |
875 | (read_only ? BTRFS_SNAPSHOT_READ_ONLY : 0) | | |
876 | BTRFS_SNAPSHOT_FALLBACK_COPY | | |
877 | BTRFS_SNAPSHOT_FALLBACK_DIRECTORY | | |
878 | BTRFS_SNAPSHOT_FALLBACK_IMMUTABLE | | |
879 | BTRFS_SNAPSHOT_RECURSIVE | | |
880 | BTRFS_SNAPSHOT_QUOTA); | |
881 | if (r >= 0) | |
9a50e3ca | 882 | /* Enable "subtree" quotas for the copy, if we didn't copy any quota from the source. */ |
8120ee28 | 883 | (void) btrfs_subvol_auto_qgroup(new_path, 0, true); |
5bcd08db | 884 | |
ebd93cb6 LP |
885 | break; |
886 | ||
aceac2f0 | 887 | case IMAGE_RAW: |
63c372cb | 888 | new_path = strjoina("/var/lib/machines/", new_name, ".raw"); |
ebd93cb6 | 889 | |
1c876927 | 890 | r = copy_file_atomic(i->path, new_path, read_only ? 0444 : 0644, FS_NOCOW_FL, COPY_REFLINK); |
ebd93cb6 LP |
891 | break; |
892 | ||
eb38edce | 893 | case IMAGE_BLOCK: |
ebd93cb6 | 894 | default: |
15411c0c | 895 | return -EOPNOTSUPP; |
ebd93cb6 LP |
896 | } |
897 | ||
898 | if (r < 0) | |
899 | return r; | |
900 | ||
8e0b6570 | 901 | STRV_FOREACH(j, settings) { |
bafbac4e | 902 | r = clone_auxiliary_file(*j, new_name, ".nspawn"); |
8e0b6570 LP |
903 | if (r < 0 && r != -ENOENT) |
904 | log_debug_errno(r, "Failed to clone settings %s, ignoring: %m", *j); | |
905 | } | |
906 | ||
bafbac4e LP |
907 | r = clone_auxiliary_file(roothash, new_name, ".roothash"); |
908 | if (r < 0 && r != -ENOENT) | |
909 | log_debug_errno(r, "Failed to clone root hash file %s, ignoring: %m", roothash); | |
910 | ||
ebd93cb6 LP |
911 | return 0; |
912 | } | |
913 | ||
914 | int image_read_only(Image *i, bool b) { | |
8e766630 | 915 | _cleanup_(release_lock_file) LockFile global_lock = LOCK_FILE_INIT, local_lock = LOCK_FILE_INIT; |
ebd93cb6 | 916 | int r; |
c7664c07 | 917 | |
ebd93cb6 LP |
918 | assert(i); |
919 | ||
d94c2b06 | 920 | if (IMAGE_IS_VENDOR(i) || IMAGE_IS_HOST(i)) |
ebd93cb6 LP |
921 | return -EROFS; |
922 | ||
30535c16 LP |
923 | /* Make sure we don't interfere with a running nspawn */ |
924 | r = image_path_lock(i->path, LOCK_EX|LOCK_NB, &global_lock, &local_lock); | |
925 | if (r < 0) | |
926 | return r; | |
927 | ||
ebd93cb6 LP |
928 | switch (i->type) { |
929 | ||
930 | case IMAGE_SUBVOLUME: | |
5bcd08db LP |
931 | |
932 | /* Note that we set the flag only on the top-level | |
933 | * subvolume of the image. */ | |
934 | ||
ebd93cb6 LP |
935 | r = btrfs_subvol_set_read_only(i->path, b); |
936 | if (r < 0) | |
937 | return r; | |
01b72568 LP |
938 | |
939 | break; | |
940 | ||
941 | case IMAGE_DIRECTORY: | |
942 | /* For simple directory trees we cannot use the access | |
943 | mode of the top-level directory, since it has an | |
944 | effect on the container itself. However, we can | |
945 | use the "immutable" flag, to at least make the | |
946 | top-level directory read-only. It's not as good as | |
947 | a read-only subvolume, but at least something, and | |
13e785f7 | 948 | we can read the value back. */ |
01b72568 | 949 | |
a67d68b8 | 950 | r = chattr_path(i->path, b ? FS_IMMUTABLE_FL : 0, FS_IMMUTABLE_FL); |
01b72568 LP |
951 | if (r < 0) |
952 | return r; | |
953 | ||
ebd93cb6 LP |
954 | break; |
955 | ||
aceac2f0 | 956 | case IMAGE_RAW: { |
ebd93cb6 LP |
957 | struct stat st; |
958 | ||
959 | if (stat(i->path, &st) < 0) | |
960 | return -errno; | |
961 | ||
962 | if (chmod(i->path, (st.st_mode & 0444) | (b ? 0000 : 0200)) < 0) | |
963 | return -errno; | |
f2068bcc LP |
964 | |
965 | /* If the images is now read-only, it's a good time to | |
966 | * defrag it, given that no write patterns will | |
967 | * fragment it again. */ | |
968 | if (b) | |
969 | (void) btrfs_defrag(i->path); | |
ebd93cb6 LP |
970 | break; |
971 | } | |
972 | ||
eb38edce LP |
973 | case IMAGE_BLOCK: { |
974 | _cleanup_close_ int fd = -1; | |
975 | struct stat st; | |
976 | int state = b; | |
977 | ||
978 | fd = open(i->path, O_CLOEXEC|O_RDONLY|O_NONBLOCK|O_NOCTTY); | |
979 | if (fd < 0) | |
980 | return -errno; | |
981 | ||
982 | if (fstat(fd, &st) < 0) | |
983 | return -errno; | |
984 | if (!S_ISBLK(st.st_mode)) | |
985 | return -ENOTTY; | |
986 | ||
987 | if (ioctl(fd, BLKROSET, &state) < 0) | |
988 | return -errno; | |
989 | ||
990 | break; | |
991 | } | |
992 | ||
ebd93cb6 | 993 | default: |
15411c0c | 994 | return -EOPNOTSUPP; |
ebd93cb6 LP |
995 | } |
996 | ||
997 | return 0; | |
08682124 LP |
998 | } |
999 | ||
30535c16 LP |
1000 | int image_path_lock(const char *path, int operation, LockFile *global, LockFile *local) { |
1001 | _cleanup_free_ char *p = NULL; | |
1002 | LockFile t = LOCK_FILE_INIT; | |
1003 | struct stat st; | |
1004 | int r; | |
1005 | ||
1006 | assert(path); | |
1007 | assert(global); | |
1008 | assert(local); | |
1009 | ||
1010 | /* Locks an image path. This actually creates two locks: one | |
1011 | * "local" one, next to the image path itself, which might be | |
1012 | * shared via NFS. And another "global" one, in /run, that | |
1013 | * uses the device/inode number. This has the benefit that we | |
1014 | * can even lock a tree that is a mount point, correctly. */ | |
1015 | ||
30535c16 LP |
1016 | if (!path_is_absolute(path)) |
1017 | return -EINVAL; | |
1018 | ||
b6e953f2 LP |
1019 | if (getenv_bool("SYSTEMD_NSPAWN_LOCK") == 0) { |
1020 | *local = *global = (LockFile) LOCK_FILE_INIT; | |
1021 | return 0; | |
1022 | } | |
1023 | ||
1024 | if (path_equal(path, "/")) | |
1025 | return -EBUSY; | |
1026 | ||
30535c16 | 1027 | if (stat(path, &st) >= 0) { |
eb38edce LP |
1028 | if (S_ISBLK(st.st_mode)) |
1029 | r = asprintf(&p, "/run/systemd/nspawn/locks/block-%u:%u", major(st.st_rdev), minor(st.st_rdev)); | |
1030 | else if (S_ISDIR(st.st_mode) || S_ISREG(st.st_mode)) | |
1031 | r = asprintf(&p, "/run/systemd/nspawn/locks/inode-%lu:%lu", (unsigned long) st.st_dev, (unsigned long) st.st_ino); | |
1032 | else | |
1033 | return -ENOTTY; | |
1034 | ||
1035 | if (r < 0) | |
30535c16 LP |
1036 | return -ENOMEM; |
1037 | } | |
1038 | ||
eb38edce LP |
1039 | /* For block devices we don't need the "local" lock, as the major/minor lock above should be sufficient, since |
1040 | * block devices are device local anyway. */ | |
1041 | if (!path_startswith(path, "/dev")) { | |
1042 | r = make_lock_file_for(path, operation, &t); | |
8be17c9b LT |
1043 | if (r < 0) { |
1044 | if ((operation & LOCK_SH) && r == -EROFS) | |
771b7ead | 1045 | log_debug_errno(r, "Failed to create shared lock for '%s', ignoring: %m", path); |
8be17c9b LT |
1046 | else |
1047 | return r; | |
1048 | } | |
eb38edce | 1049 | } |
30535c16 LP |
1050 | |
1051 | if (p) { | |
7e7cddb2 | 1052 | mkdir_p("/run/systemd/nspawn/locks", 0700); |
30535c16 LP |
1053 | |
1054 | r = make_lock_file(p, operation, global); | |
1055 | if (r < 0) { | |
1056 | release_lock_file(&t); | |
1057 | return r; | |
1058 | } | |
546dbec5 LP |
1059 | } else |
1060 | *global = (LockFile) LOCK_FILE_INIT; | |
30535c16 LP |
1061 | |
1062 | *local = t; | |
1063 | return 0; | |
1064 | } | |
1065 | ||
cb81cd80 | 1066 | int image_set_limit(Image *i, uint64_t referenced_max) { |
d6ce17c7 LP |
1067 | assert(i); |
1068 | ||
d94c2b06 | 1069 | if (IMAGE_IS_VENDOR(i) || IMAGE_IS_HOST(i)) |
d6ce17c7 LP |
1070 | return -EROFS; |
1071 | ||
1072 | if (i->type != IMAGE_SUBVOLUME) | |
15411c0c | 1073 | return -EOPNOTSUPP; |
d6ce17c7 | 1074 | |
5bcd08db LP |
1075 | /* We set the quota both for the subvolume as well as for the |
1076 | * subtree. The latter is mostly for historical reasons, since | |
1077 | * we didn't use to have a concept of subtree quota, and hence | |
1078 | * only modified the subvolume quota. */ | |
1079 | ||
1080 | (void) btrfs_qgroup_set_limit(i->path, 0, referenced_max); | |
1081 | (void) btrfs_subvol_auto_qgroup(i->path, 0, true); | |
1082 | return btrfs_subvol_set_subtree_quota_limit(i->path, 0, referenced_max); | |
d6ce17c7 LP |
1083 | } |
1084 | ||
c7664c07 | 1085 | int image_read_metadata(Image *i) { |
8e766630 | 1086 | _cleanup_(release_lock_file) LockFile global_lock = LOCK_FILE_INIT, local_lock = LOCK_FILE_INIT; |
c7664c07 LP |
1087 | int r; |
1088 | ||
1089 | assert(i); | |
1090 | ||
1091 | r = image_path_lock(i->path, LOCK_SH|LOCK_NB, &global_lock, &local_lock); | |
1092 | if (r < 0) | |
1093 | return r; | |
1094 | ||
1095 | switch (i->type) { | |
1096 | ||
1097 | case IMAGE_SUBVOLUME: | |
1098 | case IMAGE_DIRECTORY: { | |
1099 | _cleanup_strv_free_ char **machine_info = NULL, **os_release = NULL; | |
1100 | sd_id128_t machine_id = SD_ID128_NULL; | |
1101 | _cleanup_free_ char *hostname = NULL; | |
1102 | _cleanup_free_ char *path = NULL; | |
1103 | ||
62570f6f | 1104 | r = chase_symlinks("/etc/hostname", i->path, CHASE_PREFIX_ROOT|CHASE_TRAIL_SLASH, &path); |
c7664c07 LP |
1105 | if (r < 0 && r != -ENOENT) |
1106 | log_debug_errno(r, "Failed to chase /etc/hostname in image %s: %m", i->name); | |
1107 | else if (r >= 0) { | |
1108 | r = read_etc_hostname(path, &hostname); | |
1109 | if (r < 0) | |
1110 | log_debug_errno(errno, "Failed to read /etc/hostname of image %s: %m", i->name); | |
1111 | } | |
1112 | ||
1113 | path = mfree(path); | |
1114 | ||
62570f6f | 1115 | r = chase_symlinks("/etc/machine-id", i->path, CHASE_PREFIX_ROOT|CHASE_TRAIL_SLASH, &path); |
c7664c07 LP |
1116 | if (r < 0 && r != -ENOENT) |
1117 | log_debug_errno(r, "Failed to chase /etc/machine-id in image %s: %m", i->name); | |
1118 | else if (r >= 0) { | |
1119 | _cleanup_close_ int fd = -1; | |
1120 | ||
1121 | fd = open(path, O_RDONLY|O_CLOEXEC|O_NOCTTY); | |
1122 | if (fd < 0) | |
1123 | log_debug_errno(errno, "Failed to open %s: %m", path); | |
1124 | else { | |
1125 | r = id128_read_fd(fd, ID128_PLAIN, &machine_id); | |
1126 | if (r < 0) | |
1127 | log_debug_errno(r, "Image %s contains invalid machine ID.", i->name); | |
1128 | } | |
1129 | } | |
1130 | ||
1131 | path = mfree(path); | |
1132 | ||
62570f6f | 1133 | r = chase_symlinks("/etc/machine-info", i->path, CHASE_PREFIX_ROOT|CHASE_TRAIL_SLASH, &path); |
c7664c07 LP |
1134 | if (r < 0 && r != -ENOENT) |
1135 | log_debug_errno(r, "Failed to chase /etc/machine-info in image %s: %m", i->name); | |
1136 | else if (r >= 0) { | |
1137 | r = load_env_file_pairs(NULL, path, NULL, &machine_info); | |
1138 | if (r < 0) | |
1139 | log_debug_errno(r, "Failed to parse machine-info data of %s: %m", i->name); | |
1140 | } | |
1141 | ||
d58ad743 LP |
1142 | r = load_os_release_pairs(i->path, &os_release); |
1143 | if (r < 0) | |
1144 | log_debug_errno(r, "Failed to read os-release in image, ignoring: %m"); | |
c7664c07 LP |
1145 | |
1146 | free_and_replace(i->hostname, hostname); | |
1147 | i->machine_id = machine_id; | |
1148 | strv_free_and_replace(i->machine_info, machine_info); | |
1149 | strv_free_and_replace(i->os_release, os_release); | |
1150 | ||
1151 | break; | |
1152 | } | |
1153 | ||
1154 | case IMAGE_RAW: | |
1155 | case IMAGE_BLOCK: { | |
1156 | _cleanup_(loop_device_unrefp) LoopDevice *d = NULL; | |
1157 | _cleanup_(dissected_image_unrefp) DissectedImage *m = NULL; | |
1158 | ||
1159 | r = loop_device_make_by_path(i->path, O_RDONLY, &d); | |
1160 | if (r < 0) | |
1161 | return r; | |
1162 | ||
1163 | r = dissect_image(d->fd, NULL, 0, DISSECT_IMAGE_REQUIRE_ROOT, &m); | |
1164 | if (r < 0) | |
1165 | return r; | |
1166 | ||
1167 | r = dissected_image_acquire_metadata(m); | |
1168 | if (r < 0) | |
1169 | return r; | |
1170 | ||
1171 | free_and_replace(i->hostname, m->hostname); | |
1172 | i->machine_id = m->machine_id; | |
1173 | strv_free_and_replace(i->machine_info, m->machine_info); | |
1174 | strv_free_and_replace(i->os_release, m->os_release); | |
1175 | ||
1176 | break; | |
1177 | } | |
1178 | ||
1179 | default: | |
1180 | return -EOPNOTSUPP; | |
1181 | } | |
1182 | ||
1183 | i->metadata_valid = true; | |
1184 | ||
1185 | return 0; | |
1186 | } | |
1187 | ||
30535c16 LP |
1188 | int image_name_lock(const char *name, int operation, LockFile *ret) { |
1189 | const char *p; | |
1190 | ||
1191 | assert(name); | |
1192 | assert(ret); | |
1193 | ||
1194 | /* Locks an image name, regardless of the precise path used. */ | |
1195 | ||
1196 | if (!image_name_is_valid(name)) | |
1197 | return -EINVAL; | |
1198 | ||
b6e953f2 LP |
1199 | if (getenv_bool("SYSTEMD_NSPAWN_LOCK") == 0) { |
1200 | *ret = (LockFile) LOCK_FILE_INIT; | |
1201 | return 0; | |
1202 | } | |
1203 | ||
30535c16 LP |
1204 | if (streq(name, ".host")) |
1205 | return -EBUSY; | |
1206 | ||
7e7cddb2 | 1207 | mkdir_p("/run/systemd/nspawn/locks", 0700); |
63c372cb | 1208 | p = strjoina("/run/systemd/nspawn/locks/name-", name); |
30535c16 LP |
1209 | |
1210 | return make_lock_file(p, operation, ret); | |
1211 | } | |
1212 | ||
1213 | bool image_name_is_valid(const char *s) { | |
1214 | if (!filename_is_valid(s)) | |
1215 | return false; | |
1216 | ||
1217 | if (string_has_cc(s, NULL)) | |
1218 | return false; | |
1219 | ||
1220 | if (!utf8_is_valid(s)) | |
1221 | return false; | |
1222 | ||
1223 | /* Temporary files for atomically creating new files */ | |
1224 | if (startswith(s, ".#")) | |
1225 | return false; | |
1226 | ||
1227 | return true; | |
1228 | } | |
1229 | ||
ace9ab19 LP |
1230 | bool image_in_search_path(ImageClass class, const char *image) { |
1231 | const char *path; | |
1232 | ||
1233 | assert(image); | |
1234 | ||
1235 | NULSTR_FOREACH(path, image_search_path[class]) { | |
1236 | const char *p; | |
1237 | size_t k; | |
1238 | ||
1239 | p = path_startswith(image, path); | |
1240 | if (!p) | |
1241 | continue; | |
1242 | ||
1243 | /* Make sure there's a filename following */ | |
1244 | k = strcspn(p, "/"); | |
1245 | if (k == 0) | |
1246 | continue; | |
1247 | ||
1248 | p += k; | |
1249 | ||
1250 | /* Accept trailing slashes */ | |
1251 | if (p[strspn(p, "/")] == 0) | |
1252 | return true; | |
1253 | ||
1254 | } | |
1255 | ||
1256 | return false; | |
1257 | } | |
1258 | ||
cd61c3bf LP |
1259 | static const char* const image_type_table[_IMAGE_TYPE_MAX] = { |
1260 | [IMAGE_DIRECTORY] = "directory", | |
1261 | [IMAGE_SUBVOLUME] = "subvolume", | |
aceac2f0 | 1262 | [IMAGE_RAW] = "raw", |
eb38edce | 1263 | [IMAGE_BLOCK] = "block", |
cd61c3bf LP |
1264 | }; |
1265 | ||
1266 | DEFINE_STRING_TABLE_LOOKUP(image_type, ImageType); |