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Commit | Line | Data |
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53e1b683 | 1 | /* SPDX-License-Identifier: LGPL-2.1+ */ |
cd61c3bf | 2 | |
a8fbdf54 TA |
3 | #include <dirent.h> |
4 | #include <errno.h> | |
ebd93cb6 | 5 | #include <fcntl.h> |
a8fbdf54 TA |
6 | #include <stdio.h> |
7 | #include <stdlib.h> | |
8 | #include <string.h> | |
e306723e | 9 | #include <sys/file.h> |
a8fbdf54 TA |
10 | #include <sys/stat.h> |
11 | #include <unistd.h> | |
8e0b6570 | 12 | #include <linux/fs.h> |
546dbec5 | 13 | |
b5efdb8a | 14 | #include "alloc-util.h" |
cd61c3bf | 15 | #include "btrfs-util.h" |
c8b3094d | 16 | #include "chattr-util.h" |
ebd93cb6 | 17 | #include "copy.h" |
a0956174 | 18 | #include "dirent-util.h" |
c7664c07 | 19 | #include "dissect-image.h" |
b6e953f2 | 20 | #include "env-util.h" |
3ffd4af2 | 21 | #include "fd-util.h" |
c7664c07 | 22 | #include "fileio.h" |
f4f15635 | 23 | #include "fs-util.h" |
a8fbdf54 | 24 | #include "hashmap.h" |
c7664c07 LP |
25 | #include "hostname-util.h" |
26 | #include "id128-util.h" | |
a8fbdf54 TA |
27 | #include "lockfile-util.h" |
28 | #include "log.h" | |
c7664c07 | 29 | #include "loop-util.h" |
3ffd4af2 | 30 | #include "machine-image.h" |
546dbec5 | 31 | #include "macro.h" |
30535c16 | 32 | #include "mkdir.h" |
d58ad743 | 33 | #include "os-util.h" |
8e0b6570 | 34 | #include "path-util.h" |
c6878637 | 35 | #include "rm-rf.h" |
8b43440b | 36 | #include "string-table.h" |
07630cea | 37 | #include "string-util.h" |
8e0b6570 | 38 | #include "strv.h" |
a8fbdf54 | 39 | #include "time-util.h" |
8e0b6570 | 40 | #include "utf8.h" |
a8fbdf54 | 41 | #include "util.h" |
89a5a90c | 42 | #include "xattr-util.h" |
cd61c3bf | 43 | |
5ef46e5f | 44 | static const char* const image_search_path[_IMAGE_CLASS_MAX] = { |
ace9ab19 LP |
45 | [IMAGE_MACHINE] = "/etc/machines\0" /* only place symlinks here */ |
46 | "/run/machines\0" /* and here too */ | |
47 | "/var/lib/machines\0" /* the main place for images */ | |
48 | "/var/lib/container\0" /* legacy */ | |
5ef46e5f LP |
49 | "/usr/local/lib/machines\0" |
50 | "/usr/lib/machines\0", | |
51 | ||
ace9ab19 LP |
52 | [IMAGE_PORTABLE] = "/etc/portables\0" /* only place symlinks here */ |
53 | "/run/portables\0" /* and here too */ | |
54 | "/var/lib/portables\0" /* the main place for images */ | |
5ef46e5f LP |
55 | "/usr/local/lib/portables\0" |
56 | "/usr/lib/portables\0", | |
57 | }; | |
c2ce6a3d | 58 | |
8301aa0b YW |
59 | static Image *image_free(Image *i) { |
60 | assert(i); | |
9614bb06 | 61 | |
cd61c3bf LP |
62 | free(i->name); |
63 | free(i->path); | |
c7664c07 LP |
64 | |
65 | free(i->hostname); | |
66 | strv_free(i->machine_info); | |
67 | strv_free(i->os_release); | |
68 | ||
6b430fdb | 69 | return mfree(i); |
cd61c3bf LP |
70 | } |
71 | ||
8301aa0b | 72 | DEFINE_TRIVIAL_REF_UNREF_FUNC(Image, image, image_free); |
9614bb06 | 73 | |
8e0b6570 LP |
74 | static char **image_settings_path(Image *image) { |
75 | _cleanup_strv_free_ char **l = NULL; | |
8e0b6570 LP |
76 | const char *fn, *s; |
77 | unsigned i = 0; | |
78 | ||
79 | assert(image); | |
80 | ||
81 | l = new0(char*, 4); | |
82 | if (!l) | |
83 | return NULL; | |
84 | ||
85 | fn = strjoina(image->name, ".nspawn"); | |
86 | ||
87 | FOREACH_STRING(s, "/etc/systemd/nspawn/", "/run/systemd/nspawn/") { | |
88 | l[i] = strappend(s, fn); | |
89 | if (!l[i]) | |
90 | return NULL; | |
91 | ||
92 | i++; | |
93 | } | |
94 | ||
95 | l[i] = file_in_same_dir(image->path, fn); | |
96 | if (!l[i]) | |
97 | return NULL; | |
98 | ||
ae2a15bc | 99 | return TAKE_PTR(l); |
8e0b6570 LP |
100 | } |
101 | ||
bafbac4e LP |
102 | static char *image_roothash_path(Image *image) { |
103 | const char *fn; | |
104 | ||
105 | assert(image); | |
106 | ||
107 | fn = strjoina(image->name, ".roothash"); | |
108 | ||
109 | return file_in_same_dir(image->path, fn); | |
110 | } | |
111 | ||
c2ce6a3d | 112 | static int image_new( |
cd61c3bf | 113 | ImageType t, |
5fc7f358 | 114 | const char *pretty, |
cd61c3bf | 115 | const char *path, |
5fc7f358 | 116 | const char *filename, |
cd61c3bf | 117 | bool read_only, |
10f9c755 | 118 | usec_t crtime, |
cd61c3bf | 119 | usec_t mtime, |
c2ce6a3d | 120 | Image **ret) { |
cd61c3bf LP |
121 | |
122 | _cleanup_(image_unrefp) Image *i = NULL; | |
cd61c3bf | 123 | |
cd61c3bf LP |
124 | assert(t >= 0); |
125 | assert(t < _IMAGE_TYPE_MAX); | |
5fc7f358 LP |
126 | assert(pretty); |
127 | assert(filename); | |
c2ce6a3d | 128 | assert(ret); |
cd61c3bf | 129 | |
c2ce6a3d | 130 | i = new0(Image, 1); |
cd61c3bf LP |
131 | if (!i) |
132 | return -ENOMEM; | |
133 | ||
9614bb06 | 134 | i->n_ref = 1; |
cd61c3bf LP |
135 | i->type = t; |
136 | i->read_only = read_only; | |
10f9c755 | 137 | i->crtime = crtime; |
cd61c3bf | 138 | i->mtime = mtime; |
c19de711 | 139 | i->usage = i->usage_exclusive = (uint64_t) -1; |
b6b18498 | 140 | i->limit = i->limit_exclusive = (uint64_t) -1; |
cd61c3bf | 141 | |
5fc7f358 | 142 | i->name = strdup(pretty); |
cd61c3bf LP |
143 | if (!i->name) |
144 | return -ENOMEM; | |
145 | ||
5fc7f358 | 146 | if (path) |
605405c6 | 147 | i->path = strjoin(path, "/", filename); |
5fc7f358 LP |
148 | else |
149 | i->path = strdup(filename); | |
5fc7f358 LP |
150 | if (!i->path) |
151 | return -ENOMEM; | |
152 | ||
858d36c1 | 153 | path_simplify(i->path, false); |
cd61c3bf | 154 | |
1cc6c93a | 155 | *ret = TAKE_PTR(i); |
c2ce6a3d | 156 | |
cd61c3bf LP |
157 | return 0; |
158 | } | |
159 | ||
4756c94e LP |
160 | static int extract_pretty(const char *path, const char *suffix, char **ret) { |
161 | _cleanup_free_ char *name = NULL; | |
162 | const char *p; | |
163 | size_t n; | |
164 | ||
165 | assert(path); | |
166 | assert(ret); | |
167 | ||
168 | p = last_path_component(path); | |
169 | n = strcspn(p, "/"); | |
170 | ||
171 | name = strndup(p, n); | |
172 | if (!name) | |
173 | return -ENOMEM; | |
174 | ||
175 | if (suffix) { | |
176 | char *e; | |
177 | ||
178 | e = endswith(name, suffix); | |
179 | if (!e) | |
180 | return -EINVAL; | |
181 | ||
182 | *e = 0; | |
183 | } | |
184 | ||
185 | if (!image_name_is_valid(name)) | |
186 | return -EINVAL; | |
187 | ||
188 | *ret = TAKE_PTR(name); | |
189 | return 0; | |
190 | } | |
191 | ||
5fc7f358 LP |
192 | static int image_make( |
193 | const char *pretty, | |
194 | int dfd, | |
195 | const char *path, | |
196 | const char *filename, | |
3a6ce860 | 197 | const struct stat *st, |
5fc7f358 LP |
198 | Image **ret) { |
199 | ||
4756c94e | 200 | _cleanup_free_ char *pretty_buffer = NULL; |
3a6ce860 | 201 | struct stat stbuf; |
5fc7f358 | 202 | bool read_only; |
cd61c3bf LP |
203 | int r; |
204 | ||
3a6ce860 | 205 | assert(dfd >= 0 || dfd == AT_FDCWD); |
5fc7f358 | 206 | assert(filename); |
cd61c3bf | 207 | |
eb38edce | 208 | /* We explicitly *do* follow symlinks here, since we want to allow symlinking trees, raw files and block |
3a6ce860 LP |
209 | * devices into /var/lib/machines/, and treat them normally. |
210 | * | |
211 | * This function returns -ENOENT if we can't find the image after all, and -EMEDIUMTYPE if it's not a file we | |
212 | * recognize. */ | |
cd61c3bf | 213 | |
3a6ce860 LP |
214 | if (!st) { |
215 | if (fstatat(dfd, filename, &stbuf, 0) < 0) | |
216 | return -errno; | |
217 | ||
218 | st = &stbuf; | |
219 | } | |
cd61c3bf | 220 | |
5fc7f358 LP |
221 | read_only = |
222 | (path && path_startswith(path, "/usr")) || | |
08ff5529 | 223 | (faccessat(dfd, filename, W_OK, AT_EACCESS) < 0 && errno == EROFS); |
86e339c8 | 224 | |
3a6ce860 | 225 | if (S_ISDIR(st->st_mode)) { |
01b72568 LP |
226 | _cleanup_close_ int fd = -1; |
227 | unsigned file_attr = 0; | |
cd61c3bf | 228 | |
c2ce6a3d | 229 | if (!ret) |
3a6ce860 | 230 | return 0; |
cd61c3bf | 231 | |
4756c94e LP |
232 | if (!pretty) { |
233 | r = extract_pretty(filename, NULL, &pretty_buffer); | |
234 | if (r < 0) | |
235 | return r; | |
236 | ||
237 | pretty = pretty_buffer; | |
238 | } | |
5fc7f358 | 239 | |
01b72568 LP |
240 | fd = openat(dfd, filename, O_CLOEXEC|O_NOCTTY|O_DIRECTORY); |
241 | if (fd < 0) | |
242 | return -errno; | |
243 | ||
c2ce6a3d | 244 | /* btrfs subvolumes have inode 256 */ |
3a6ce860 | 245 | if (st->st_ino == 256) { |
cd61c3bf | 246 | |
21222ea5 LP |
247 | r = btrfs_is_filesystem(fd); |
248 | if (r < 0) | |
249 | return r; | |
250 | if (r) { | |
10f9c755 | 251 | BtrfsSubvolInfo info; |
cd61c3bf | 252 | |
c2ce6a3d | 253 | /* It's a btrfs subvolume */ |
cd61c3bf | 254 | |
5bcd08db | 255 | r = btrfs_subvol_get_info_fd(fd, 0, &info); |
10f9c755 LP |
256 | if (r < 0) |
257 | return r; | |
c2ce6a3d LP |
258 | |
259 | r = image_new(IMAGE_SUBVOLUME, | |
5fc7f358 | 260 | pretty, |
c2ce6a3d | 261 | path, |
5fc7f358 LP |
262 | filename, |
263 | info.read_only || read_only, | |
10f9c755 | 264 | info.otime, |
c2ce6a3d | 265 | 0, |
c2ce6a3d LP |
266 | ret); |
267 | if (r < 0) | |
268 | return r; | |
269 | ||
5bcd08db LP |
270 | if (btrfs_quota_scan_ongoing(fd) == 0) { |
271 | BtrfsQuotaInfo quota; | |
b6b18498 | 272 | |
5bcd08db LP |
273 | r = btrfs_subvol_get_subtree_quota_fd(fd, 0, "a); |
274 | if (r >= 0) { | |
275 | (*ret)->usage = quota.referenced; | |
276 | (*ret)->usage_exclusive = quota.exclusive; | |
277 | ||
278 | (*ret)->limit = quota.referenced_max; | |
279 | (*ret)->limit_exclusive = quota.exclusive_max; | |
280 | } | |
b6b18498 LP |
281 | } |
282 | ||
3a6ce860 | 283 | return 0; |
cd61c3bf | 284 | } |
c2ce6a3d | 285 | } |
cd61c3bf | 286 | |
01b72568 LP |
287 | /* If the IMMUTABLE bit is set, we consider the |
288 | * directory read-only. Since the ioctl is not | |
289 | * supported everywhere we ignore failures. */ | |
290 | (void) read_attr_fd(fd, &file_attr); | |
cd61c3bf | 291 | |
01b72568 | 292 | /* It's just a normal directory. */ |
c2ce6a3d | 293 | r = image_new(IMAGE_DIRECTORY, |
5fc7f358 | 294 | pretty, |
c2ce6a3d | 295 | path, |
5fc7f358 | 296 | filename, |
01b72568 | 297 | read_only || (file_attr & FS_IMMUTABLE_FL), |
c2ce6a3d LP |
298 | 0, |
299 | 0, | |
300 | ret); | |
301 | if (r < 0) | |
302 | return r; | |
cd61c3bf | 303 | |
3a6ce860 | 304 | return 0; |
cd61c3bf | 305 | |
3a6ce860 | 306 | } else if (S_ISREG(st->st_mode) && endswith(filename, ".raw")) { |
10f9c755 | 307 | usec_t crtime = 0; |
cd61c3bf | 308 | |
aceac2f0 | 309 | /* It's a RAW disk image */ |
cd61c3bf | 310 | |
c2ce6a3d | 311 | if (!ret) |
3a6ce860 | 312 | return 0; |
cd61c3bf | 313 | |
4756c94e | 314 | (void) fd_getcrtime_at(dfd, filename, &crtime, 0); |
10f9c755 | 315 | |
4756c94e LP |
316 | if (!pretty) { |
317 | r = extract_pretty(filename, ".raw", &pretty_buffer); | |
318 | if (r < 0) | |
319 | return r; | |
320 | ||
321 | pretty = pretty_buffer; | |
322 | } | |
10f9c755 | 323 | |
aceac2f0 | 324 | r = image_new(IMAGE_RAW, |
5fc7f358 | 325 | pretty, |
c2ce6a3d | 326 | path, |
5fc7f358 | 327 | filename, |
3a6ce860 | 328 | !(st->st_mode & 0222) || read_only, |
10f9c755 | 329 | crtime, |
3a6ce860 | 330 | timespec_load(&st->st_mtim), |
c2ce6a3d LP |
331 | ret); |
332 | if (r < 0) | |
333 | return r; | |
cd61c3bf | 334 | |
3a6ce860 LP |
335 | (*ret)->usage = (*ret)->usage_exclusive = st->st_blocks * 512; |
336 | (*ret)->limit = (*ret)->limit_exclusive = st->st_size; | |
b6b18498 | 337 | |
3a6ce860 | 338 | return 0; |
eb38edce | 339 | |
3a6ce860 | 340 | } else if (S_ISBLK(st->st_mode)) { |
eb38edce LP |
341 | _cleanup_close_ int block_fd = -1; |
342 | uint64_t size = UINT64_MAX; | |
343 | ||
344 | /* A block device */ | |
345 | ||
346 | if (!ret) | |
3a6ce860 | 347 | return 0; |
eb38edce | 348 | |
4756c94e LP |
349 | if (!pretty) { |
350 | r = extract_pretty(filename, NULL, &pretty_buffer); | |
351 | if (r < 0) | |
352 | return r; | |
353 | ||
354 | pretty = pretty_buffer; | |
355 | } | |
eb38edce LP |
356 | |
357 | block_fd = openat(dfd, filename, O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_NOCTTY); | |
358 | if (block_fd < 0) | |
359 | log_debug_errno(errno, "Failed to open block device %s/%s, ignoring: %m", path, filename); | |
360 | else { | |
3a6ce860 LP |
361 | /* Refresh stat data after opening the node */ |
362 | if (fstat(block_fd, &stbuf) < 0) | |
eb38edce | 363 | return -errno; |
3a6ce860 LP |
364 | st = &stbuf; |
365 | ||
366 | if (!S_ISBLK(st->st_mode)) /* Verify that what we opened is actually what we think it is */ | |
eb38edce LP |
367 | return -ENOTTY; |
368 | ||
369 | if (!read_only) { | |
370 | int state = 0; | |
371 | ||
372 | if (ioctl(block_fd, BLKROGET, &state) < 0) | |
373 | log_debug_errno(errno, "Failed to issue BLKROGET on device %s/%s, ignoring: %m", path, filename); | |
374 | else if (state) | |
375 | read_only = true; | |
376 | } | |
377 | ||
378 | if (ioctl(block_fd, BLKGETSIZE64, &size) < 0) | |
4c2e654b | 379 | log_debug_errno(errno, "Failed to issue BLKGETSIZE64 on device %s/%s, ignoring: %m", path, filename); |
eb38edce LP |
380 | |
381 | block_fd = safe_close(block_fd); | |
382 | } | |
383 | ||
384 | r = image_new(IMAGE_BLOCK, | |
385 | pretty, | |
386 | path, | |
387 | filename, | |
3a6ce860 | 388 | !(st->st_mode & 0222) || read_only, |
eb38edce LP |
389 | 0, |
390 | 0, | |
391 | ret); | |
392 | if (r < 0) | |
393 | return r; | |
394 | ||
395 | if (size != 0 && size != UINT64_MAX) | |
396 | (*ret)->usage = (*ret)->usage_exclusive = (*ret)->limit = (*ret)->limit_exclusive = size; | |
397 | ||
3a6ce860 | 398 | return 0; |
c2ce6a3d | 399 | } |
cd61c3bf | 400 | |
3a6ce860 | 401 | return -EMEDIUMTYPE; |
c2ce6a3d | 402 | } |
cd61c3bf | 403 | |
5ef46e5f | 404 | int image_find(ImageClass class, const char *name, Image **ret) { |
c2ce6a3d LP |
405 | const char *path; |
406 | int r; | |
cd61c3bf | 407 | |
5ef46e5f LP |
408 | assert(class >= 0); |
409 | assert(class < _IMAGE_CLASS_MAX); | |
c2ce6a3d | 410 | assert(name); |
cd61c3bf | 411 | |
c2ce6a3d LP |
412 | /* There are no images with invalid names */ |
413 | if (!image_name_is_valid(name)) | |
3a6ce860 | 414 | return -ENOENT; |
cd61c3bf | 415 | |
5ef46e5f | 416 | NULSTR_FOREACH(path, image_search_path[class]) { |
c2ce6a3d | 417 | _cleanup_closedir_ DIR *d = NULL; |
3a6ce860 | 418 | struct stat st; |
cd61c3bf | 419 | |
c2ce6a3d LP |
420 | d = opendir(path); |
421 | if (!d) { | |
422 | if (errno == ENOENT) | |
423 | continue; | |
cd61c3bf | 424 | |
c2ce6a3d LP |
425 | return -errno; |
426 | } | |
cd61c3bf | 427 | |
3a6ce860 LP |
428 | /* As mentioned above, we follow symlinks on this fstatat(), because we want to permit people to |
429 | * symlink block devices into the search path */ | |
430 | if (fstatat(dirfd(d), name, &st, 0) < 0) { | |
aceac2f0 | 431 | _cleanup_free_ char *raw = NULL; |
5fc7f358 | 432 | |
3a6ce860 LP |
433 | if (errno != ENOENT) |
434 | return -errno; | |
435 | ||
aceac2f0 LP |
436 | raw = strappend(name, ".raw"); |
437 | if (!raw) | |
5fc7f358 LP |
438 | return -ENOMEM; |
439 | ||
3a6ce860 LP |
440 | if (fstatat(dirfd(d), raw, &st, 0) < 0) { |
441 | ||
442 | if (errno == ENOENT) | |
443 | continue; | |
444 | ||
445 | return -errno; | |
446 | } | |
447 | ||
448 | if (!S_ISREG(st.st_mode)) | |
5fc7f358 | 449 | continue; |
3a6ce860 LP |
450 | |
451 | r = image_make(name, dirfd(d), path, raw, &st, ret); | |
452 | ||
453 | } else { | |
454 | if (!S_ISDIR(st.st_mode) && !S_ISBLK(st.st_mode)) | |
455 | continue; | |
456 | ||
457 | r = image_make(name, dirfd(d), path, name, &st, ret); | |
5fc7f358 | 458 | } |
3a6ce860 LP |
459 | if (IN_SET(r, -ENOENT, -EMEDIUMTYPE)) |
460 | continue; | |
c2ce6a3d LP |
461 | if (r < 0) |
462 | return r; | |
cd61c3bf | 463 | |
cf604fd4 LP |
464 | if (ret) |
465 | (*ret)->discoverable = true; | |
466 | ||
c2ce6a3d LP |
467 | return 1; |
468 | } | |
469 | ||
cf604fd4 LP |
470 | if (class == IMAGE_MACHINE && streq(name, ".host")) { |
471 | r = image_make(".host", AT_FDCWD, NULL, "/", NULL, ret); | |
472 | if (r < 0) | |
473 | return r; | |
474 | ||
475 | if (ret) | |
476 | (*ret)->discoverable = true; | |
477 | ||
478 | return r; | |
479 | } | |
5fc7f358 | 480 | |
3a6ce860 | 481 | return -ENOENT; |
c2ce6a3d LP |
482 | }; |
483 | ||
2ddf182b | 484 | int image_from_path(const char *path, Image **ret) { |
cf604fd4 LP |
485 | |
486 | /* Note that we don't set the 'discoverable' field of the returned object, because we don't check here whether | |
487 | * the image is in the image search path. And if it is we don't know if the path we used is actually not | |
3fe91079 | 488 | * overridden by another, different image earlier in the search path */ |
cf604fd4 | 489 | |
2ddf182b LP |
490 | if (path_equal(path, "/")) |
491 | return image_make(".host", AT_FDCWD, NULL, "/", NULL, ret); | |
492 | ||
493 | return image_make(NULL, AT_FDCWD, NULL, path, NULL, ret); | |
494 | } | |
495 | ||
496 | int image_find_harder(ImageClass class, const char *name_or_path, Image **ret) { | |
497 | if (image_name_is_valid(name_or_path)) | |
498 | return image_find(class, name_or_path, ret); | |
499 | ||
500 | return image_from_path(name_or_path, ret); | |
501 | } | |
502 | ||
5ef46e5f | 503 | int image_discover(ImageClass class, Hashmap *h) { |
c2ce6a3d LP |
504 | const char *path; |
505 | int r; | |
506 | ||
5ef46e5f LP |
507 | assert(class >= 0); |
508 | assert(class < _IMAGE_CLASS_MAX); | |
c2ce6a3d LP |
509 | assert(h); |
510 | ||
5ef46e5f | 511 | NULSTR_FOREACH(path, image_search_path[class]) { |
c2ce6a3d LP |
512 | _cleanup_closedir_ DIR *d = NULL; |
513 | struct dirent *de; | |
514 | ||
515 | d = opendir(path); | |
516 | if (!d) { | |
517 | if (errno == ENOENT) | |
a67a4c8c | 518 | continue; |
c2ce6a3d LP |
519 | |
520 | return -errno; | |
521 | } | |
522 | ||
523 | FOREACH_DIRENT_ALL(de, d, return -errno) { | |
524 | _cleanup_(image_unrefp) Image *image = NULL; | |
1bf36bf9 | 525 | _cleanup_free_ char *truncated = NULL; |
3a6ce860 LP |
526 | const char *pretty; |
527 | struct stat st; | |
c2ce6a3d | 528 | |
1bf36bf9 | 529 | if (dot_or_dot_dot(de->d_name)) |
c2ce6a3d LP |
530 | continue; |
531 | ||
3a6ce860 LP |
532 | /* As mentioned above, we follow symlinks on this fstatat(), because we want to permit people |
533 | * to symlink block devices into the search path */ | |
534 | if (fstatat(dirfd(d), de->d_name, &st, 0) < 0) { | |
535 | if (errno == ENOENT) | |
536 | continue; | |
537 | ||
538 | return -errno; | |
539 | } | |
540 | ||
541 | if (S_ISREG(st.st_mode)) { | |
542 | const char *e; | |
543 | ||
544 | e = endswith(de->d_name, ".raw"); | |
545 | if (!e) | |
546 | continue; | |
547 | ||
1bf36bf9 LP |
548 | truncated = strndup(de->d_name, e - de->d_name); |
549 | if (!truncated) | |
550 | return -ENOMEM; | |
551 | ||
552 | pretty = truncated; | |
3a6ce860 | 553 | } else if (S_ISDIR(st.st_mode) || S_ISBLK(st.st_mode)) |
1bf36bf9 | 554 | pretty = de->d_name; |
3a6ce860 LP |
555 | else |
556 | continue; | |
1bf36bf9 LP |
557 | |
558 | if (!image_name_is_valid(pretty)) | |
559 | continue; | |
560 | ||
561 | if (hashmap_contains(h, pretty)) | |
c2ce6a3d LP |
562 | continue; |
563 | ||
3a6ce860 LP |
564 | r = image_make(pretty, dirfd(d), path, de->d_name, &st, &image); |
565 | if (IN_SET(r, -ENOENT, -EMEDIUMTYPE)) | |
c2ce6a3d LP |
566 | continue; |
567 | if (r < 0) | |
568 | return r; | |
569 | ||
cf604fd4 LP |
570 | image->discoverable = true; |
571 | ||
c2ce6a3d LP |
572 | r = hashmap_put(h, image->name, image); |
573 | if (r < 0) | |
574 | return r; | |
575 | ||
576 | image = NULL; | |
cd61c3bf LP |
577 | } |
578 | } | |
579 | ||
5ef46e5f | 580 | if (class == IMAGE_MACHINE && !hashmap_contains(h, ".host")) { |
5fc7f358 LP |
581 | _cleanup_(image_unrefp) Image *image = NULL; |
582 | ||
3a6ce860 | 583 | r = image_make(".host", AT_FDCWD, NULL, "/", NULL, &image); |
5fc7f358 LP |
584 | if (r < 0) |
585 | return r; | |
586 | ||
cf604fd4 LP |
587 | image->discoverable = true; |
588 | ||
5fc7f358 LP |
589 | r = hashmap_put(h, image->name, image); |
590 | if (r < 0) | |
591 | return r; | |
592 | ||
593 | image = NULL; | |
5fc7f358 LP |
594 | } |
595 | ||
cd61c3bf LP |
596 | return 0; |
597 | } | |
598 | ||
08682124 | 599 | int image_remove(Image *i) { |
8e766630 | 600 | _cleanup_(release_lock_file) LockFile global_lock = LOCK_FILE_INIT, local_lock = LOCK_FILE_INIT; |
8e0b6570 | 601 | _cleanup_strv_free_ char **settings = NULL; |
bafbac4e | 602 | _cleanup_free_ char *roothash = NULL; |
8e0b6570 | 603 | char **j; |
30535c16 LP |
604 | int r; |
605 | ||
08682124 LP |
606 | assert(i); |
607 | ||
d94c2b06 | 608 | if (IMAGE_IS_VENDOR(i) || IMAGE_IS_HOST(i)) |
08682124 LP |
609 | return -EROFS; |
610 | ||
8e0b6570 LP |
611 | settings = image_settings_path(i); |
612 | if (!settings) | |
613 | return -ENOMEM; | |
614 | ||
bafbac4e LP |
615 | roothash = image_roothash_path(i); |
616 | if (!roothash) | |
617 | return -ENOMEM; | |
618 | ||
30535c16 LP |
619 | /* Make sure we don't interfere with a running nspawn */ |
620 | r = image_path_lock(i->path, LOCK_EX|LOCK_NB, &global_lock, &local_lock); | |
621 | if (r < 0) | |
622 | return r; | |
623 | ||
ebd93cb6 LP |
624 | switch (i->type) { |
625 | ||
626 | case IMAGE_SUBVOLUME: | |
9fb0b9c7 LP |
627 | |
628 | /* Let's unlink first, maybe it is a symlink? If that works we are happy. Otherwise, let's get out the | |
629 | * big guns */ | |
630 | if (unlink(i->path) < 0) { | |
631 | r = btrfs_subvol_remove(i->path, BTRFS_REMOVE_RECURSIVE|BTRFS_REMOVE_QUOTA); | |
632 | if (r < 0) | |
633 | return r; | |
634 | } | |
635 | ||
8e0b6570 | 636 | break; |
ebd93cb6 LP |
637 | |
638 | case IMAGE_DIRECTORY: | |
01b72568 | 639 | /* Allow deletion of read-only directories */ |
a67d68b8 | 640 | (void) chattr_path(i->path, 0, FS_IMMUTABLE_FL); |
8e0b6570 LP |
641 | r = rm_rf(i->path, REMOVE_ROOT|REMOVE_PHYSICAL|REMOVE_SUBVOLUME); |
642 | if (r < 0) | |
643 | return r; | |
644 | ||
645 | break; | |
01b72568 | 646 | |
eb38edce LP |
647 | case IMAGE_BLOCK: |
648 | ||
649 | /* If this is inside of /dev, then it's a real block device, hence let's not touch the device node | |
650 | * itself (but let's remove the stuff stored alongside it). If it's anywhere else, let's try to unlink | |
651 | * the thing (it's most likely a symlink after all). */ | |
652 | ||
653 | if (path_startswith(i->path, "/dev")) | |
654 | break; | |
655 | ||
4831981d | 656 | _fallthrough_; |
aceac2f0 | 657 | case IMAGE_RAW: |
41d1ed05 LP |
658 | if (unlink(i->path) < 0) |
659 | return -errno; | |
8e0b6570 | 660 | break; |
ebd93cb6 LP |
661 | |
662 | default: | |
15411c0c | 663 | return -EOPNOTSUPP; |
ebd93cb6 | 664 | } |
8e0b6570 LP |
665 | |
666 | STRV_FOREACH(j, settings) { | |
667 | if (unlink(*j) < 0 && errno != ENOENT) | |
668 | log_debug_errno(errno, "Failed to unlink %s, ignoring: %m", *j); | |
669 | } | |
670 | ||
bafbac4e LP |
671 | if (unlink(roothash) < 0 && errno != ENOENT) |
672 | log_debug_errno(errno, "Failed to unlink %s, ignoring: %m", roothash); | |
673 | ||
8e0b6570 LP |
674 | return 0; |
675 | } | |
676 | ||
bafbac4e | 677 | static int rename_auxiliary_file(const char *path, const char *new_name, const char *suffix) { |
8e0b6570 LP |
678 | _cleanup_free_ char *rs = NULL; |
679 | const char *fn; | |
680 | ||
bafbac4e | 681 | fn = strjoina(new_name, suffix); |
8e0b6570 LP |
682 | |
683 | rs = file_in_same_dir(path, fn); | |
684 | if (!rs) | |
685 | return -ENOMEM; | |
686 | ||
687 | return rename_noreplace(AT_FDCWD, path, AT_FDCWD, rs); | |
ebd93cb6 LP |
688 | } |
689 | ||
690 | int image_rename(Image *i, const char *new_name) { | |
8e766630 | 691 | _cleanup_(release_lock_file) LockFile global_lock = LOCK_FILE_INIT, local_lock = LOCK_FILE_INIT, name_lock = LOCK_FILE_INIT; |
bafbac4e | 692 | _cleanup_free_ char *new_path = NULL, *nn = NULL, *roothash = NULL; |
8e0b6570 | 693 | _cleanup_strv_free_ char **settings = NULL; |
01b72568 | 694 | unsigned file_attr = 0; |
8e0b6570 | 695 | char **j; |
ebd93cb6 LP |
696 | int r; |
697 | ||
698 | assert(i); | |
699 | ||
700 | if (!image_name_is_valid(new_name)) | |
701 | return -EINVAL; | |
702 | ||
d94c2b06 | 703 | if (IMAGE_IS_VENDOR(i) || IMAGE_IS_HOST(i)) |
ebd93cb6 LP |
704 | return -EROFS; |
705 | ||
8e0b6570 LP |
706 | settings = image_settings_path(i); |
707 | if (!settings) | |
708 | return -ENOMEM; | |
709 | ||
bafbac4e LP |
710 | roothash = image_roothash_path(i); |
711 | if (!roothash) | |
712 | return -ENOMEM; | |
713 | ||
30535c16 LP |
714 | /* Make sure we don't interfere with a running nspawn */ |
715 | r = image_path_lock(i->path, LOCK_EX|LOCK_NB, &global_lock, &local_lock); | |
716 | if (r < 0) | |
717 | return r; | |
718 | ||
719 | /* Make sure nobody takes the new name, between the time we | |
720 | * checked it is currently unused in all search paths, and the | |
f8e2f4d6 | 721 | * time we take possession of it */ |
30535c16 LP |
722 | r = image_name_lock(new_name, LOCK_EX|LOCK_NB, &name_lock); |
723 | if (r < 0) | |
724 | return r; | |
725 | ||
5ef46e5f | 726 | r = image_find(IMAGE_MACHINE, new_name, NULL); |
3a6ce860 | 727 | if (r >= 0) |
ebd93cb6 | 728 | return -EEXIST; |
3a6ce860 LP |
729 | if (r != -ENOENT) |
730 | return r; | |
ebd93cb6 LP |
731 | |
732 | switch (i->type) { | |
733 | ||
ebd93cb6 | 734 | case IMAGE_DIRECTORY: |
01b72568 LP |
735 | /* Turn of the immutable bit while we rename the image, so that we can rename it */ |
736 | (void) read_attr_path(i->path, &file_attr); | |
737 | ||
738 | if (file_attr & FS_IMMUTABLE_FL) | |
a67d68b8 | 739 | (void) chattr_path(i->path, 0, FS_IMMUTABLE_FL); |
01b72568 | 740 | |
4831981d | 741 | _fallthrough_; |
01b72568 | 742 | case IMAGE_SUBVOLUME: |
ebd93cb6 LP |
743 | new_path = file_in_same_dir(i->path, new_name); |
744 | break; | |
745 | ||
eb38edce LP |
746 | case IMAGE_BLOCK: |
747 | ||
748 | /* Refuse renaming raw block devices in /dev, the names are picked by udev after all. */ | |
749 | if (path_startswith(i->path, "/dev")) | |
750 | return -EROFS; | |
751 | ||
752 | new_path = file_in_same_dir(i->path, new_name); | |
753 | break; | |
754 | ||
aceac2f0 | 755 | case IMAGE_RAW: { |
ebd93cb6 LP |
756 | const char *fn; |
757 | ||
63c372cb | 758 | fn = strjoina(new_name, ".raw"); |
ebd93cb6 LP |
759 | new_path = file_in_same_dir(i->path, fn); |
760 | break; | |
761 | } | |
762 | ||
763 | default: | |
15411c0c | 764 | return -EOPNOTSUPP; |
ebd93cb6 LP |
765 | } |
766 | ||
767 | if (!new_path) | |
768 | return -ENOMEM; | |
769 | ||
770 | nn = strdup(new_name); | |
771 | if (!nn) | |
772 | return -ENOMEM; | |
773 | ||
f85ef957 AC |
774 | r = rename_noreplace(AT_FDCWD, i->path, AT_FDCWD, new_path); |
775 | if (r < 0) | |
776 | return r; | |
ebd93cb6 | 777 | |
01b72568 LP |
778 | /* Restore the immutable bit, if it was set before */ |
779 | if (file_attr & FS_IMMUTABLE_FL) | |
a67d68b8 | 780 | (void) chattr_path(new_path, FS_IMMUTABLE_FL, FS_IMMUTABLE_FL); |
01b72568 | 781 | |
f9ecfd3b DL |
782 | free_and_replace(i->path, new_path); |
783 | free_and_replace(i->name, nn); | |
ebd93cb6 | 784 | |
8e0b6570 | 785 | STRV_FOREACH(j, settings) { |
bafbac4e | 786 | r = rename_auxiliary_file(*j, new_name, ".nspawn"); |
8e0b6570 LP |
787 | if (r < 0 && r != -ENOENT) |
788 | log_debug_errno(r, "Failed to rename settings file %s, ignoring: %m", *j); | |
789 | } | |
790 | ||
bafbac4e LP |
791 | r = rename_auxiliary_file(roothash, new_name, ".roothash"); |
792 | if (r < 0 && r != -ENOENT) | |
793 | log_debug_errno(r, "Failed to rename roothash file %s, ignoring: %m", roothash); | |
794 | ||
ebd93cb6 LP |
795 | return 0; |
796 | } | |
797 | ||
bafbac4e | 798 | static int clone_auxiliary_file(const char *path, const char *new_name, const char *suffix) { |
8e0b6570 LP |
799 | _cleanup_free_ char *rs = NULL; |
800 | const char *fn; | |
801 | ||
bafbac4e | 802 | fn = strjoina(new_name, suffix); |
8e0b6570 LP |
803 | |
804 | rs = file_in_same_dir(path, fn); | |
805 | if (!rs) | |
806 | return -ENOMEM; | |
807 | ||
1c876927 | 808 | return copy_file_atomic(path, rs, 0664, 0, COPY_REFLINK); |
8e0b6570 LP |
809 | } |
810 | ||
ebd93cb6 | 811 | int image_clone(Image *i, const char *new_name, bool read_only) { |
8e766630 | 812 | _cleanup_(release_lock_file) LockFile name_lock = LOCK_FILE_INIT; |
8e0b6570 | 813 | _cleanup_strv_free_ char **settings = NULL; |
bafbac4e | 814 | _cleanup_free_ char *roothash = NULL; |
ebd93cb6 | 815 | const char *new_path; |
8e0b6570 | 816 | char **j; |
ebd93cb6 LP |
817 | int r; |
818 | ||
819 | assert(i); | |
820 | ||
821 | if (!image_name_is_valid(new_name)) | |
822 | return -EINVAL; | |
823 | ||
8e0b6570 LP |
824 | settings = image_settings_path(i); |
825 | if (!settings) | |
826 | return -ENOMEM; | |
827 | ||
bafbac4e LP |
828 | roothash = image_roothash_path(i); |
829 | if (!roothash) | |
830 | return -ENOMEM; | |
831 | ||
30535c16 LP |
832 | /* Make sure nobody takes the new name, between the time we |
833 | * checked it is currently unused in all search paths, and the | |
f8e2f4d6 | 834 | * time we take possession of it */ |
30535c16 LP |
835 | r = image_name_lock(new_name, LOCK_EX|LOCK_NB, &name_lock); |
836 | if (r < 0) | |
837 | return r; | |
838 | ||
5ef46e5f | 839 | r = image_find(IMAGE_MACHINE, new_name, NULL); |
3a6ce860 | 840 | if (r >= 0) |
ebd93cb6 | 841 | return -EEXIST; |
3a6ce860 LP |
842 | if (r != -ENOENT) |
843 | return r; | |
ebd93cb6 LP |
844 | |
845 | switch (i->type) { | |
846 | ||
847 | case IMAGE_SUBVOLUME: | |
848 | case IMAGE_DIRECTORY: | |
9a50e3ca | 849 | /* If we can we'll always try to create a new btrfs subvolume here, even if the source is a plain |
13e785f7 | 850 | * directory. */ |
9a50e3ca | 851 | |
63c372cb | 852 | new_path = strjoina("/var/lib/machines/", new_name); |
ebd93cb6 | 853 | |
17cbb288 LP |
854 | r = btrfs_subvol_snapshot(i->path, new_path, |
855 | (read_only ? BTRFS_SNAPSHOT_READ_ONLY : 0) | | |
856 | BTRFS_SNAPSHOT_FALLBACK_COPY | | |
857 | BTRFS_SNAPSHOT_FALLBACK_DIRECTORY | | |
858 | BTRFS_SNAPSHOT_FALLBACK_IMMUTABLE | | |
859 | BTRFS_SNAPSHOT_RECURSIVE | | |
860 | BTRFS_SNAPSHOT_QUOTA); | |
861 | if (r >= 0) | |
9a50e3ca | 862 | /* Enable "subtree" quotas for the copy, if we didn't copy any quota from the source. */ |
8120ee28 | 863 | (void) btrfs_subvol_auto_qgroup(new_path, 0, true); |
5bcd08db | 864 | |
ebd93cb6 LP |
865 | break; |
866 | ||
aceac2f0 | 867 | case IMAGE_RAW: |
63c372cb | 868 | new_path = strjoina("/var/lib/machines/", new_name, ".raw"); |
ebd93cb6 | 869 | |
1c876927 | 870 | r = copy_file_atomic(i->path, new_path, read_only ? 0444 : 0644, FS_NOCOW_FL, COPY_REFLINK); |
ebd93cb6 LP |
871 | break; |
872 | ||
eb38edce | 873 | case IMAGE_BLOCK: |
ebd93cb6 | 874 | default: |
15411c0c | 875 | return -EOPNOTSUPP; |
ebd93cb6 LP |
876 | } |
877 | ||
878 | if (r < 0) | |
879 | return r; | |
880 | ||
8e0b6570 | 881 | STRV_FOREACH(j, settings) { |
bafbac4e | 882 | r = clone_auxiliary_file(*j, new_name, ".nspawn"); |
8e0b6570 LP |
883 | if (r < 0 && r != -ENOENT) |
884 | log_debug_errno(r, "Failed to clone settings %s, ignoring: %m", *j); | |
885 | } | |
886 | ||
bafbac4e LP |
887 | r = clone_auxiliary_file(roothash, new_name, ".roothash"); |
888 | if (r < 0 && r != -ENOENT) | |
889 | log_debug_errno(r, "Failed to clone root hash file %s, ignoring: %m", roothash); | |
890 | ||
ebd93cb6 LP |
891 | return 0; |
892 | } | |
893 | ||
894 | int image_read_only(Image *i, bool b) { | |
8e766630 | 895 | _cleanup_(release_lock_file) LockFile global_lock = LOCK_FILE_INIT, local_lock = LOCK_FILE_INIT; |
ebd93cb6 | 896 | int r; |
c7664c07 | 897 | |
ebd93cb6 LP |
898 | assert(i); |
899 | ||
d94c2b06 | 900 | if (IMAGE_IS_VENDOR(i) || IMAGE_IS_HOST(i)) |
ebd93cb6 LP |
901 | return -EROFS; |
902 | ||
30535c16 LP |
903 | /* Make sure we don't interfere with a running nspawn */ |
904 | r = image_path_lock(i->path, LOCK_EX|LOCK_NB, &global_lock, &local_lock); | |
905 | if (r < 0) | |
906 | return r; | |
907 | ||
ebd93cb6 LP |
908 | switch (i->type) { |
909 | ||
910 | case IMAGE_SUBVOLUME: | |
5bcd08db LP |
911 | |
912 | /* Note that we set the flag only on the top-level | |
913 | * subvolume of the image. */ | |
914 | ||
ebd93cb6 LP |
915 | r = btrfs_subvol_set_read_only(i->path, b); |
916 | if (r < 0) | |
917 | return r; | |
01b72568 LP |
918 | |
919 | break; | |
920 | ||
921 | case IMAGE_DIRECTORY: | |
922 | /* For simple directory trees we cannot use the access | |
923 | mode of the top-level directory, since it has an | |
924 | effect on the container itself. However, we can | |
925 | use the "immutable" flag, to at least make the | |
926 | top-level directory read-only. It's not as good as | |
927 | a read-only subvolume, but at least something, and | |
13e785f7 | 928 | we can read the value back. */ |
01b72568 | 929 | |
a67d68b8 | 930 | r = chattr_path(i->path, b ? FS_IMMUTABLE_FL : 0, FS_IMMUTABLE_FL); |
01b72568 LP |
931 | if (r < 0) |
932 | return r; | |
933 | ||
ebd93cb6 LP |
934 | break; |
935 | ||
aceac2f0 | 936 | case IMAGE_RAW: { |
ebd93cb6 LP |
937 | struct stat st; |
938 | ||
939 | if (stat(i->path, &st) < 0) | |
940 | return -errno; | |
941 | ||
942 | if (chmod(i->path, (st.st_mode & 0444) | (b ? 0000 : 0200)) < 0) | |
943 | return -errno; | |
f2068bcc LP |
944 | |
945 | /* If the images is now read-only, it's a good time to | |
946 | * defrag it, given that no write patterns will | |
947 | * fragment it again. */ | |
948 | if (b) | |
949 | (void) btrfs_defrag(i->path); | |
ebd93cb6 LP |
950 | break; |
951 | } | |
952 | ||
eb38edce LP |
953 | case IMAGE_BLOCK: { |
954 | _cleanup_close_ int fd = -1; | |
955 | struct stat st; | |
956 | int state = b; | |
957 | ||
958 | fd = open(i->path, O_CLOEXEC|O_RDONLY|O_NONBLOCK|O_NOCTTY); | |
959 | if (fd < 0) | |
960 | return -errno; | |
961 | ||
962 | if (fstat(fd, &st) < 0) | |
963 | return -errno; | |
964 | if (!S_ISBLK(st.st_mode)) | |
965 | return -ENOTTY; | |
966 | ||
967 | if (ioctl(fd, BLKROSET, &state) < 0) | |
968 | return -errno; | |
969 | ||
970 | break; | |
971 | } | |
972 | ||
ebd93cb6 | 973 | default: |
15411c0c | 974 | return -EOPNOTSUPP; |
ebd93cb6 LP |
975 | } |
976 | ||
977 | return 0; | |
08682124 LP |
978 | } |
979 | ||
30535c16 LP |
980 | int image_path_lock(const char *path, int operation, LockFile *global, LockFile *local) { |
981 | _cleanup_free_ char *p = NULL; | |
982 | LockFile t = LOCK_FILE_INIT; | |
983 | struct stat st; | |
984 | int r; | |
985 | ||
986 | assert(path); | |
987 | assert(global); | |
988 | assert(local); | |
989 | ||
990 | /* Locks an image path. This actually creates two locks: one | |
991 | * "local" one, next to the image path itself, which might be | |
992 | * shared via NFS. And another "global" one, in /run, that | |
993 | * uses the device/inode number. This has the benefit that we | |
994 | * can even lock a tree that is a mount point, correctly. */ | |
995 | ||
30535c16 LP |
996 | if (!path_is_absolute(path)) |
997 | return -EINVAL; | |
998 | ||
b6e953f2 LP |
999 | if (getenv_bool("SYSTEMD_NSPAWN_LOCK") == 0) { |
1000 | *local = *global = (LockFile) LOCK_FILE_INIT; | |
1001 | return 0; | |
1002 | } | |
1003 | ||
1004 | if (path_equal(path, "/")) | |
1005 | return -EBUSY; | |
1006 | ||
30535c16 | 1007 | if (stat(path, &st) >= 0) { |
eb38edce LP |
1008 | if (S_ISBLK(st.st_mode)) |
1009 | r = asprintf(&p, "/run/systemd/nspawn/locks/block-%u:%u", major(st.st_rdev), minor(st.st_rdev)); | |
1010 | else if (S_ISDIR(st.st_mode) || S_ISREG(st.st_mode)) | |
1011 | r = asprintf(&p, "/run/systemd/nspawn/locks/inode-%lu:%lu", (unsigned long) st.st_dev, (unsigned long) st.st_ino); | |
1012 | else | |
1013 | return -ENOTTY; | |
1014 | ||
1015 | if (r < 0) | |
30535c16 LP |
1016 | return -ENOMEM; |
1017 | } | |
1018 | ||
eb38edce LP |
1019 | /* For block devices we don't need the "local" lock, as the major/minor lock above should be sufficient, since |
1020 | * block devices are device local anyway. */ | |
1021 | if (!path_startswith(path, "/dev")) { | |
1022 | r = make_lock_file_for(path, operation, &t); | |
8be17c9b LT |
1023 | if (r < 0) { |
1024 | if ((operation & LOCK_SH) && r == -EROFS) | |
771b7ead | 1025 | log_debug_errno(r, "Failed to create shared lock for '%s', ignoring: %m", path); |
8be17c9b LT |
1026 | else |
1027 | return r; | |
1028 | } | |
eb38edce | 1029 | } |
30535c16 LP |
1030 | |
1031 | if (p) { | |
7e7cddb2 | 1032 | mkdir_p("/run/systemd/nspawn/locks", 0700); |
30535c16 LP |
1033 | |
1034 | r = make_lock_file(p, operation, global); | |
1035 | if (r < 0) { | |
1036 | release_lock_file(&t); | |
1037 | return r; | |
1038 | } | |
546dbec5 LP |
1039 | } else |
1040 | *global = (LockFile) LOCK_FILE_INIT; | |
30535c16 LP |
1041 | |
1042 | *local = t; | |
1043 | return 0; | |
1044 | } | |
1045 | ||
cb81cd80 | 1046 | int image_set_limit(Image *i, uint64_t referenced_max) { |
d6ce17c7 LP |
1047 | assert(i); |
1048 | ||
d94c2b06 | 1049 | if (IMAGE_IS_VENDOR(i) || IMAGE_IS_HOST(i)) |
d6ce17c7 LP |
1050 | return -EROFS; |
1051 | ||
1052 | if (i->type != IMAGE_SUBVOLUME) | |
15411c0c | 1053 | return -EOPNOTSUPP; |
d6ce17c7 | 1054 | |
5bcd08db LP |
1055 | /* We set the quota both for the subvolume as well as for the |
1056 | * subtree. The latter is mostly for historical reasons, since | |
1057 | * we didn't use to have a concept of subtree quota, and hence | |
1058 | * only modified the subvolume quota. */ | |
1059 | ||
1060 | (void) btrfs_qgroup_set_limit(i->path, 0, referenced_max); | |
1061 | (void) btrfs_subvol_auto_qgroup(i->path, 0, true); | |
1062 | return btrfs_subvol_set_subtree_quota_limit(i->path, 0, referenced_max); | |
d6ce17c7 LP |
1063 | } |
1064 | ||
c7664c07 | 1065 | int image_read_metadata(Image *i) { |
8e766630 | 1066 | _cleanup_(release_lock_file) LockFile global_lock = LOCK_FILE_INIT, local_lock = LOCK_FILE_INIT; |
c7664c07 LP |
1067 | int r; |
1068 | ||
1069 | assert(i); | |
1070 | ||
1071 | r = image_path_lock(i->path, LOCK_SH|LOCK_NB, &global_lock, &local_lock); | |
1072 | if (r < 0) | |
1073 | return r; | |
1074 | ||
1075 | switch (i->type) { | |
1076 | ||
1077 | case IMAGE_SUBVOLUME: | |
1078 | case IMAGE_DIRECTORY: { | |
1079 | _cleanup_strv_free_ char **machine_info = NULL, **os_release = NULL; | |
1080 | sd_id128_t machine_id = SD_ID128_NULL; | |
1081 | _cleanup_free_ char *hostname = NULL; | |
1082 | _cleanup_free_ char *path = NULL; | |
1083 | ||
62570f6f | 1084 | r = chase_symlinks("/etc/hostname", i->path, CHASE_PREFIX_ROOT|CHASE_TRAIL_SLASH, &path); |
c7664c07 LP |
1085 | if (r < 0 && r != -ENOENT) |
1086 | log_debug_errno(r, "Failed to chase /etc/hostname in image %s: %m", i->name); | |
1087 | else if (r >= 0) { | |
1088 | r = read_etc_hostname(path, &hostname); | |
1089 | if (r < 0) | |
1090 | log_debug_errno(errno, "Failed to read /etc/hostname of image %s: %m", i->name); | |
1091 | } | |
1092 | ||
1093 | path = mfree(path); | |
1094 | ||
62570f6f | 1095 | r = chase_symlinks("/etc/machine-id", i->path, CHASE_PREFIX_ROOT|CHASE_TRAIL_SLASH, &path); |
c7664c07 LP |
1096 | if (r < 0 && r != -ENOENT) |
1097 | log_debug_errno(r, "Failed to chase /etc/machine-id in image %s: %m", i->name); | |
1098 | else if (r >= 0) { | |
1099 | _cleanup_close_ int fd = -1; | |
1100 | ||
1101 | fd = open(path, O_RDONLY|O_CLOEXEC|O_NOCTTY); | |
1102 | if (fd < 0) | |
1103 | log_debug_errno(errno, "Failed to open %s: %m", path); | |
1104 | else { | |
1105 | r = id128_read_fd(fd, ID128_PLAIN, &machine_id); | |
1106 | if (r < 0) | |
1107 | log_debug_errno(r, "Image %s contains invalid machine ID.", i->name); | |
1108 | } | |
1109 | } | |
1110 | ||
1111 | path = mfree(path); | |
1112 | ||
62570f6f | 1113 | r = chase_symlinks("/etc/machine-info", i->path, CHASE_PREFIX_ROOT|CHASE_TRAIL_SLASH, &path); |
c7664c07 LP |
1114 | if (r < 0 && r != -ENOENT) |
1115 | log_debug_errno(r, "Failed to chase /etc/machine-info in image %s: %m", i->name); | |
1116 | else if (r >= 0) { | |
1117 | r = load_env_file_pairs(NULL, path, NULL, &machine_info); | |
1118 | if (r < 0) | |
1119 | log_debug_errno(r, "Failed to parse machine-info data of %s: %m", i->name); | |
1120 | } | |
1121 | ||
d58ad743 LP |
1122 | r = load_os_release_pairs(i->path, &os_release); |
1123 | if (r < 0) | |
1124 | log_debug_errno(r, "Failed to read os-release in image, ignoring: %m"); | |
c7664c07 LP |
1125 | |
1126 | free_and_replace(i->hostname, hostname); | |
1127 | i->machine_id = machine_id; | |
1128 | strv_free_and_replace(i->machine_info, machine_info); | |
1129 | strv_free_and_replace(i->os_release, os_release); | |
1130 | ||
1131 | break; | |
1132 | } | |
1133 | ||
1134 | case IMAGE_RAW: | |
1135 | case IMAGE_BLOCK: { | |
1136 | _cleanup_(loop_device_unrefp) LoopDevice *d = NULL; | |
1137 | _cleanup_(dissected_image_unrefp) DissectedImage *m = NULL; | |
1138 | ||
1139 | r = loop_device_make_by_path(i->path, O_RDONLY, &d); | |
1140 | if (r < 0) | |
1141 | return r; | |
1142 | ||
1143 | r = dissect_image(d->fd, NULL, 0, DISSECT_IMAGE_REQUIRE_ROOT, &m); | |
1144 | if (r < 0) | |
1145 | return r; | |
1146 | ||
1147 | r = dissected_image_acquire_metadata(m); | |
1148 | if (r < 0) | |
1149 | return r; | |
1150 | ||
1151 | free_and_replace(i->hostname, m->hostname); | |
1152 | i->machine_id = m->machine_id; | |
1153 | strv_free_and_replace(i->machine_info, m->machine_info); | |
1154 | strv_free_and_replace(i->os_release, m->os_release); | |
1155 | ||
1156 | break; | |
1157 | } | |
1158 | ||
1159 | default: | |
1160 | return -EOPNOTSUPP; | |
1161 | } | |
1162 | ||
1163 | i->metadata_valid = true; | |
1164 | ||
1165 | return 0; | |
1166 | } | |
1167 | ||
30535c16 LP |
1168 | int image_name_lock(const char *name, int operation, LockFile *ret) { |
1169 | const char *p; | |
1170 | ||
1171 | assert(name); | |
1172 | assert(ret); | |
1173 | ||
1174 | /* Locks an image name, regardless of the precise path used. */ | |
1175 | ||
1176 | if (!image_name_is_valid(name)) | |
1177 | return -EINVAL; | |
1178 | ||
b6e953f2 LP |
1179 | if (getenv_bool("SYSTEMD_NSPAWN_LOCK") == 0) { |
1180 | *ret = (LockFile) LOCK_FILE_INIT; | |
1181 | return 0; | |
1182 | } | |
1183 | ||
30535c16 LP |
1184 | if (streq(name, ".host")) |
1185 | return -EBUSY; | |
1186 | ||
7e7cddb2 | 1187 | mkdir_p("/run/systemd/nspawn/locks", 0700); |
63c372cb | 1188 | p = strjoina("/run/systemd/nspawn/locks/name-", name); |
30535c16 LP |
1189 | |
1190 | return make_lock_file(p, operation, ret); | |
1191 | } | |
1192 | ||
1193 | bool image_name_is_valid(const char *s) { | |
1194 | if (!filename_is_valid(s)) | |
1195 | return false; | |
1196 | ||
1197 | if (string_has_cc(s, NULL)) | |
1198 | return false; | |
1199 | ||
1200 | if (!utf8_is_valid(s)) | |
1201 | return false; | |
1202 | ||
1203 | /* Temporary files for atomically creating new files */ | |
1204 | if (startswith(s, ".#")) | |
1205 | return false; | |
1206 | ||
1207 | return true; | |
1208 | } | |
1209 | ||
ace9ab19 LP |
1210 | bool image_in_search_path(ImageClass class, const char *image) { |
1211 | const char *path; | |
1212 | ||
1213 | assert(image); | |
1214 | ||
1215 | NULSTR_FOREACH(path, image_search_path[class]) { | |
1216 | const char *p; | |
1217 | size_t k; | |
1218 | ||
1219 | p = path_startswith(image, path); | |
1220 | if (!p) | |
1221 | continue; | |
1222 | ||
1223 | /* Make sure there's a filename following */ | |
1224 | k = strcspn(p, "/"); | |
1225 | if (k == 0) | |
1226 | continue; | |
1227 | ||
1228 | p += k; | |
1229 | ||
1230 | /* Accept trailing slashes */ | |
1231 | if (p[strspn(p, "/")] == 0) | |
1232 | return true; | |
1233 | ||
1234 | } | |
1235 | ||
1236 | return false; | |
1237 | } | |
1238 | ||
cd61c3bf LP |
1239 | static const char* const image_type_table[_IMAGE_TYPE_MAX] = { |
1240 | [IMAGE_DIRECTORY] = "directory", | |
1241 | [IMAGE_SUBVOLUME] = "subvolume", | |
aceac2f0 | 1242 | [IMAGE_RAW] = "raw", |
eb38edce | 1243 | [IMAGE_BLOCK] = "block", |
cd61c3bf LP |
1244 | }; |
1245 | ||
1246 | DEFINE_STRING_TABLE_LOOKUP(image_type, ImageType); |