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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); |
b07ec5a1 YW |
73 | DEFINE_HASH_OPS_WITH_VALUE_DESTRUCTOR(image_hash_ops, char, string_hash_func, string_compare_func, |
74 | Image, image_unref); | |
9614bb06 | 75 | |
8e0b6570 LP |
76 | static char **image_settings_path(Image *image) { |
77 | _cleanup_strv_free_ char **l = NULL; | |
8e0b6570 LP |
78 | const char *fn, *s; |
79 | unsigned i = 0; | |
80 | ||
81 | assert(image); | |
82 | ||
83 | l = new0(char*, 4); | |
84 | if (!l) | |
85 | return NULL; | |
86 | ||
87 | fn = strjoina(image->name, ".nspawn"); | |
88 | ||
89 | FOREACH_STRING(s, "/etc/systemd/nspawn/", "/run/systemd/nspawn/") { | |
90 | l[i] = strappend(s, fn); | |
91 | if (!l[i]) | |
92 | return NULL; | |
93 | ||
94 | i++; | |
95 | } | |
96 | ||
97 | l[i] = file_in_same_dir(image->path, fn); | |
98 | if (!l[i]) | |
99 | return NULL; | |
100 | ||
ae2a15bc | 101 | return TAKE_PTR(l); |
8e0b6570 LP |
102 | } |
103 | ||
bafbac4e LP |
104 | static char *image_roothash_path(Image *image) { |
105 | const char *fn; | |
106 | ||
107 | assert(image); | |
108 | ||
109 | fn = strjoina(image->name, ".roothash"); | |
110 | ||
111 | return file_in_same_dir(image->path, fn); | |
112 | } | |
113 | ||
c2ce6a3d | 114 | static int image_new( |
cd61c3bf | 115 | ImageType t, |
5fc7f358 | 116 | const char *pretty, |
cd61c3bf | 117 | const char *path, |
5fc7f358 | 118 | const char *filename, |
cd61c3bf | 119 | bool read_only, |
10f9c755 | 120 | usec_t crtime, |
cd61c3bf | 121 | usec_t mtime, |
c2ce6a3d | 122 | Image **ret) { |
cd61c3bf LP |
123 | |
124 | _cleanup_(image_unrefp) Image *i = NULL; | |
cd61c3bf | 125 | |
cd61c3bf LP |
126 | assert(t >= 0); |
127 | assert(t < _IMAGE_TYPE_MAX); | |
5fc7f358 LP |
128 | assert(pretty); |
129 | assert(filename); | |
c2ce6a3d | 130 | assert(ret); |
cd61c3bf | 131 | |
c2ce6a3d | 132 | i = new0(Image, 1); |
cd61c3bf LP |
133 | if (!i) |
134 | return -ENOMEM; | |
135 | ||
9614bb06 | 136 | i->n_ref = 1; |
cd61c3bf LP |
137 | i->type = t; |
138 | i->read_only = read_only; | |
10f9c755 | 139 | i->crtime = crtime; |
cd61c3bf | 140 | i->mtime = mtime; |
c19de711 | 141 | i->usage = i->usage_exclusive = (uint64_t) -1; |
b6b18498 | 142 | i->limit = i->limit_exclusive = (uint64_t) -1; |
cd61c3bf | 143 | |
5fc7f358 | 144 | i->name = strdup(pretty); |
cd61c3bf LP |
145 | if (!i->name) |
146 | return -ENOMEM; | |
147 | ||
5fc7f358 | 148 | if (path) |
605405c6 | 149 | i->path = strjoin(path, "/", filename); |
5fc7f358 LP |
150 | else |
151 | i->path = strdup(filename); | |
5fc7f358 LP |
152 | if (!i->path) |
153 | return -ENOMEM; | |
154 | ||
858d36c1 | 155 | path_simplify(i->path, false); |
cd61c3bf | 156 | |
1cc6c93a | 157 | *ret = TAKE_PTR(i); |
c2ce6a3d | 158 | |
cd61c3bf LP |
159 | return 0; |
160 | } | |
161 | ||
4756c94e LP |
162 | static int extract_pretty(const char *path, const char *suffix, char **ret) { |
163 | _cleanup_free_ char *name = NULL; | |
164 | const char *p; | |
165 | size_t n; | |
166 | ||
167 | assert(path); | |
168 | assert(ret); | |
169 | ||
170 | p = last_path_component(path); | |
171 | n = strcspn(p, "/"); | |
172 | ||
173 | name = strndup(p, n); | |
174 | if (!name) | |
175 | return -ENOMEM; | |
176 | ||
177 | if (suffix) { | |
178 | char *e; | |
179 | ||
180 | e = endswith(name, suffix); | |
181 | if (!e) | |
182 | return -EINVAL; | |
183 | ||
184 | *e = 0; | |
185 | } | |
186 | ||
187 | if (!image_name_is_valid(name)) | |
188 | return -EINVAL; | |
189 | ||
190 | *ret = TAKE_PTR(name); | |
191 | return 0; | |
192 | } | |
193 | ||
5fc7f358 LP |
194 | static int image_make( |
195 | const char *pretty, | |
196 | int dfd, | |
197 | const char *path, | |
198 | const char *filename, | |
3a6ce860 | 199 | const struct stat *st, |
5fc7f358 LP |
200 | Image **ret) { |
201 | ||
4756c94e | 202 | _cleanup_free_ char *pretty_buffer = NULL; |
3a6ce860 | 203 | struct stat stbuf; |
5fc7f358 | 204 | bool read_only; |
cd61c3bf LP |
205 | int r; |
206 | ||
3a6ce860 | 207 | assert(dfd >= 0 || dfd == AT_FDCWD); |
5fc7f358 | 208 | assert(filename); |
cd61c3bf | 209 | |
eb38edce | 210 | /* We explicitly *do* follow symlinks here, since we want to allow symlinking trees, raw files and block |
3a6ce860 LP |
211 | * devices into /var/lib/machines/, and treat them normally. |
212 | * | |
213 | * This function returns -ENOENT if we can't find the image after all, and -EMEDIUMTYPE if it's not a file we | |
214 | * recognize. */ | |
cd61c3bf | 215 | |
3a6ce860 LP |
216 | if (!st) { |
217 | if (fstatat(dfd, filename, &stbuf, 0) < 0) | |
218 | return -errno; | |
219 | ||
220 | st = &stbuf; | |
221 | } | |
cd61c3bf | 222 | |
5fc7f358 LP |
223 | read_only = |
224 | (path && path_startswith(path, "/usr")) || | |
08ff5529 | 225 | (faccessat(dfd, filename, W_OK, AT_EACCESS) < 0 && errno == EROFS); |
86e339c8 | 226 | |
3a6ce860 | 227 | if (S_ISDIR(st->st_mode)) { |
01b72568 LP |
228 | _cleanup_close_ int fd = -1; |
229 | unsigned file_attr = 0; | |
cd61c3bf | 230 | |
c2ce6a3d | 231 | if (!ret) |
3a6ce860 | 232 | return 0; |
cd61c3bf | 233 | |
4756c94e LP |
234 | if (!pretty) { |
235 | r = extract_pretty(filename, NULL, &pretty_buffer); | |
236 | if (r < 0) | |
237 | return r; | |
238 | ||
239 | pretty = pretty_buffer; | |
240 | } | |
5fc7f358 | 241 | |
01b72568 LP |
242 | fd = openat(dfd, filename, O_CLOEXEC|O_NOCTTY|O_DIRECTORY); |
243 | if (fd < 0) | |
244 | return -errno; | |
245 | ||
c2ce6a3d | 246 | /* btrfs subvolumes have inode 256 */ |
3a6ce860 | 247 | if (st->st_ino == 256) { |
cd61c3bf | 248 | |
21222ea5 LP |
249 | r = btrfs_is_filesystem(fd); |
250 | if (r < 0) | |
251 | return r; | |
252 | if (r) { | |
10f9c755 | 253 | BtrfsSubvolInfo info; |
cd61c3bf | 254 | |
c2ce6a3d | 255 | /* It's a btrfs subvolume */ |
cd61c3bf | 256 | |
5bcd08db | 257 | r = btrfs_subvol_get_info_fd(fd, 0, &info); |
10f9c755 LP |
258 | if (r < 0) |
259 | return r; | |
c2ce6a3d LP |
260 | |
261 | r = image_new(IMAGE_SUBVOLUME, | |
5fc7f358 | 262 | pretty, |
c2ce6a3d | 263 | path, |
5fc7f358 LP |
264 | filename, |
265 | info.read_only || read_only, | |
10f9c755 | 266 | info.otime, |
c2ce6a3d | 267 | 0, |
c2ce6a3d LP |
268 | ret); |
269 | if (r < 0) | |
270 | return r; | |
271 | ||
5bcd08db LP |
272 | if (btrfs_quota_scan_ongoing(fd) == 0) { |
273 | BtrfsQuotaInfo quota; | |
b6b18498 | 274 | |
5bcd08db LP |
275 | r = btrfs_subvol_get_subtree_quota_fd(fd, 0, "a); |
276 | if (r >= 0) { | |
277 | (*ret)->usage = quota.referenced; | |
278 | (*ret)->usage_exclusive = quota.exclusive; | |
279 | ||
280 | (*ret)->limit = quota.referenced_max; | |
281 | (*ret)->limit_exclusive = quota.exclusive_max; | |
282 | } | |
b6b18498 LP |
283 | } |
284 | ||
3a6ce860 | 285 | return 0; |
cd61c3bf | 286 | } |
c2ce6a3d | 287 | } |
cd61c3bf | 288 | |
01b72568 LP |
289 | /* If the IMMUTABLE bit is set, we consider the |
290 | * directory read-only. Since the ioctl is not | |
291 | * supported everywhere we ignore failures. */ | |
292 | (void) read_attr_fd(fd, &file_attr); | |
cd61c3bf | 293 | |
01b72568 | 294 | /* It's just a normal directory. */ |
c2ce6a3d | 295 | r = image_new(IMAGE_DIRECTORY, |
5fc7f358 | 296 | pretty, |
c2ce6a3d | 297 | path, |
5fc7f358 | 298 | filename, |
01b72568 | 299 | read_only || (file_attr & FS_IMMUTABLE_FL), |
c2ce6a3d LP |
300 | 0, |
301 | 0, | |
302 | ret); | |
303 | if (r < 0) | |
304 | return r; | |
cd61c3bf | 305 | |
3a6ce860 | 306 | return 0; |
cd61c3bf | 307 | |
3a6ce860 | 308 | } else if (S_ISREG(st->st_mode) && endswith(filename, ".raw")) { |
10f9c755 | 309 | usec_t crtime = 0; |
cd61c3bf | 310 | |
aceac2f0 | 311 | /* It's a RAW disk image */ |
cd61c3bf | 312 | |
c2ce6a3d | 313 | if (!ret) |
3a6ce860 | 314 | return 0; |
cd61c3bf | 315 | |
4756c94e | 316 | (void) fd_getcrtime_at(dfd, filename, &crtime, 0); |
10f9c755 | 317 | |
4756c94e LP |
318 | if (!pretty) { |
319 | r = extract_pretty(filename, ".raw", &pretty_buffer); | |
320 | if (r < 0) | |
321 | return r; | |
322 | ||
323 | pretty = pretty_buffer; | |
324 | } | |
10f9c755 | 325 | |
aceac2f0 | 326 | r = image_new(IMAGE_RAW, |
5fc7f358 | 327 | pretty, |
c2ce6a3d | 328 | path, |
5fc7f358 | 329 | filename, |
3a6ce860 | 330 | !(st->st_mode & 0222) || read_only, |
10f9c755 | 331 | crtime, |
3a6ce860 | 332 | timespec_load(&st->st_mtim), |
c2ce6a3d LP |
333 | ret); |
334 | if (r < 0) | |
335 | return r; | |
cd61c3bf | 336 | |
3a6ce860 LP |
337 | (*ret)->usage = (*ret)->usage_exclusive = st->st_blocks * 512; |
338 | (*ret)->limit = (*ret)->limit_exclusive = st->st_size; | |
b6b18498 | 339 | |
3a6ce860 | 340 | return 0; |
eb38edce | 341 | |
3a6ce860 | 342 | } else if (S_ISBLK(st->st_mode)) { |
eb38edce LP |
343 | _cleanup_close_ int block_fd = -1; |
344 | uint64_t size = UINT64_MAX; | |
345 | ||
346 | /* A block device */ | |
347 | ||
348 | if (!ret) | |
3a6ce860 | 349 | return 0; |
eb38edce | 350 | |
4756c94e LP |
351 | if (!pretty) { |
352 | r = extract_pretty(filename, NULL, &pretty_buffer); | |
353 | if (r < 0) | |
354 | return r; | |
355 | ||
356 | pretty = pretty_buffer; | |
357 | } | |
eb38edce LP |
358 | |
359 | block_fd = openat(dfd, filename, O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_NOCTTY); | |
360 | if (block_fd < 0) | |
361 | log_debug_errno(errno, "Failed to open block device %s/%s, ignoring: %m", path, filename); | |
362 | else { | |
3a6ce860 LP |
363 | /* Refresh stat data after opening the node */ |
364 | if (fstat(block_fd, &stbuf) < 0) | |
eb38edce | 365 | return -errno; |
3a6ce860 LP |
366 | st = &stbuf; |
367 | ||
368 | if (!S_ISBLK(st->st_mode)) /* Verify that what we opened is actually what we think it is */ | |
eb38edce LP |
369 | return -ENOTTY; |
370 | ||
371 | if (!read_only) { | |
372 | int state = 0; | |
373 | ||
374 | if (ioctl(block_fd, BLKROGET, &state) < 0) | |
375 | log_debug_errno(errno, "Failed to issue BLKROGET on device %s/%s, ignoring: %m", path, filename); | |
376 | else if (state) | |
377 | read_only = true; | |
378 | } | |
379 | ||
380 | if (ioctl(block_fd, BLKGETSIZE64, &size) < 0) | |
4c2e654b | 381 | log_debug_errno(errno, "Failed to issue BLKGETSIZE64 on device %s/%s, ignoring: %m", path, filename); |
eb38edce LP |
382 | |
383 | block_fd = safe_close(block_fd); | |
384 | } | |
385 | ||
386 | r = image_new(IMAGE_BLOCK, | |
387 | pretty, | |
388 | path, | |
389 | filename, | |
3a6ce860 | 390 | !(st->st_mode & 0222) || read_only, |
eb38edce LP |
391 | 0, |
392 | 0, | |
393 | ret); | |
394 | if (r < 0) | |
395 | return r; | |
396 | ||
397 | if (size != 0 && size != UINT64_MAX) | |
398 | (*ret)->usage = (*ret)->usage_exclusive = (*ret)->limit = (*ret)->limit_exclusive = size; | |
399 | ||
3a6ce860 | 400 | return 0; |
c2ce6a3d | 401 | } |
cd61c3bf | 402 | |
3a6ce860 | 403 | return -EMEDIUMTYPE; |
c2ce6a3d | 404 | } |
cd61c3bf | 405 | |
5ef46e5f | 406 | int image_find(ImageClass class, const char *name, Image **ret) { |
c2ce6a3d LP |
407 | const char *path; |
408 | int r; | |
cd61c3bf | 409 | |
5ef46e5f LP |
410 | assert(class >= 0); |
411 | assert(class < _IMAGE_CLASS_MAX); | |
c2ce6a3d | 412 | assert(name); |
cd61c3bf | 413 | |
c2ce6a3d LP |
414 | /* There are no images with invalid names */ |
415 | if (!image_name_is_valid(name)) | |
3a6ce860 | 416 | return -ENOENT; |
cd61c3bf | 417 | |
5ef46e5f | 418 | NULSTR_FOREACH(path, image_search_path[class]) { |
c2ce6a3d | 419 | _cleanup_closedir_ DIR *d = NULL; |
3a6ce860 | 420 | struct stat st; |
cd61c3bf | 421 | |
c2ce6a3d LP |
422 | d = opendir(path); |
423 | if (!d) { | |
424 | if (errno == ENOENT) | |
425 | continue; | |
cd61c3bf | 426 | |
c2ce6a3d LP |
427 | return -errno; |
428 | } | |
cd61c3bf | 429 | |
3a6ce860 LP |
430 | /* As mentioned above, we follow symlinks on this fstatat(), because we want to permit people to |
431 | * symlink block devices into the search path */ | |
432 | if (fstatat(dirfd(d), name, &st, 0) < 0) { | |
aceac2f0 | 433 | _cleanup_free_ char *raw = NULL; |
5fc7f358 | 434 | |
3a6ce860 LP |
435 | if (errno != ENOENT) |
436 | return -errno; | |
437 | ||
aceac2f0 LP |
438 | raw = strappend(name, ".raw"); |
439 | if (!raw) | |
5fc7f358 LP |
440 | return -ENOMEM; |
441 | ||
3a6ce860 LP |
442 | if (fstatat(dirfd(d), raw, &st, 0) < 0) { |
443 | ||
444 | if (errno == ENOENT) | |
445 | continue; | |
446 | ||
447 | return -errno; | |
448 | } | |
449 | ||
450 | if (!S_ISREG(st.st_mode)) | |
5fc7f358 | 451 | continue; |
3a6ce860 LP |
452 | |
453 | r = image_make(name, dirfd(d), path, raw, &st, ret); | |
454 | ||
455 | } else { | |
456 | if (!S_ISDIR(st.st_mode) && !S_ISBLK(st.st_mode)) | |
457 | continue; | |
458 | ||
459 | r = image_make(name, dirfd(d), path, name, &st, ret); | |
5fc7f358 | 460 | } |
3a6ce860 LP |
461 | if (IN_SET(r, -ENOENT, -EMEDIUMTYPE)) |
462 | continue; | |
c2ce6a3d LP |
463 | if (r < 0) |
464 | return r; | |
cd61c3bf | 465 | |
cf604fd4 LP |
466 | if (ret) |
467 | (*ret)->discoverable = true; | |
468 | ||
c2ce6a3d LP |
469 | return 1; |
470 | } | |
471 | ||
cf604fd4 LP |
472 | if (class == IMAGE_MACHINE && streq(name, ".host")) { |
473 | r = image_make(".host", AT_FDCWD, NULL, "/", NULL, ret); | |
474 | if (r < 0) | |
475 | return r; | |
476 | ||
477 | if (ret) | |
478 | (*ret)->discoverable = true; | |
479 | ||
480 | return r; | |
481 | } | |
5fc7f358 | 482 | |
3a6ce860 | 483 | return -ENOENT; |
c2ce6a3d LP |
484 | }; |
485 | ||
2ddf182b | 486 | int image_from_path(const char *path, Image **ret) { |
cf604fd4 LP |
487 | |
488 | /* Note that we don't set the 'discoverable' field of the returned object, because we don't check here whether | |
489 | * 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 | 490 | * overridden by another, different image earlier in the search path */ |
cf604fd4 | 491 | |
2ddf182b LP |
492 | if (path_equal(path, "/")) |
493 | return image_make(".host", AT_FDCWD, NULL, "/", NULL, ret); | |
494 | ||
495 | return image_make(NULL, AT_FDCWD, NULL, path, NULL, ret); | |
496 | } | |
497 | ||
498 | int image_find_harder(ImageClass class, const char *name_or_path, Image **ret) { | |
499 | if (image_name_is_valid(name_or_path)) | |
500 | return image_find(class, name_or_path, ret); | |
501 | ||
502 | return image_from_path(name_or_path, ret); | |
503 | } | |
504 | ||
5ef46e5f | 505 | int image_discover(ImageClass class, Hashmap *h) { |
c2ce6a3d LP |
506 | const char *path; |
507 | int r; | |
508 | ||
5ef46e5f LP |
509 | assert(class >= 0); |
510 | assert(class < _IMAGE_CLASS_MAX); | |
c2ce6a3d LP |
511 | assert(h); |
512 | ||
5ef46e5f | 513 | NULSTR_FOREACH(path, image_search_path[class]) { |
c2ce6a3d LP |
514 | _cleanup_closedir_ DIR *d = NULL; |
515 | struct dirent *de; | |
516 | ||
517 | d = opendir(path); | |
518 | if (!d) { | |
519 | if (errno == ENOENT) | |
a67a4c8c | 520 | continue; |
c2ce6a3d LP |
521 | |
522 | return -errno; | |
523 | } | |
524 | ||
525 | FOREACH_DIRENT_ALL(de, d, return -errno) { | |
526 | _cleanup_(image_unrefp) Image *image = NULL; | |
1bf36bf9 | 527 | _cleanup_free_ char *truncated = NULL; |
3a6ce860 LP |
528 | const char *pretty; |
529 | struct stat st; | |
c2ce6a3d | 530 | |
1bf36bf9 | 531 | if (dot_or_dot_dot(de->d_name)) |
c2ce6a3d LP |
532 | continue; |
533 | ||
3a6ce860 LP |
534 | /* As mentioned above, we follow symlinks on this fstatat(), because we want to permit people |
535 | * to symlink block devices into the search path */ | |
536 | if (fstatat(dirfd(d), de->d_name, &st, 0) < 0) { | |
537 | if (errno == ENOENT) | |
538 | continue; | |
539 | ||
540 | return -errno; | |
541 | } | |
542 | ||
543 | if (S_ISREG(st.st_mode)) { | |
544 | const char *e; | |
545 | ||
546 | e = endswith(de->d_name, ".raw"); | |
547 | if (!e) | |
548 | continue; | |
549 | ||
1bf36bf9 LP |
550 | truncated = strndup(de->d_name, e - de->d_name); |
551 | if (!truncated) | |
552 | return -ENOMEM; | |
553 | ||
554 | pretty = truncated; | |
3a6ce860 | 555 | } else if (S_ISDIR(st.st_mode) || S_ISBLK(st.st_mode)) |
1bf36bf9 | 556 | pretty = de->d_name; |
3a6ce860 LP |
557 | else |
558 | continue; | |
1bf36bf9 LP |
559 | |
560 | if (!image_name_is_valid(pretty)) | |
561 | continue; | |
562 | ||
563 | if (hashmap_contains(h, pretty)) | |
c2ce6a3d LP |
564 | continue; |
565 | ||
3a6ce860 LP |
566 | r = image_make(pretty, dirfd(d), path, de->d_name, &st, &image); |
567 | if (IN_SET(r, -ENOENT, -EMEDIUMTYPE)) | |
c2ce6a3d LP |
568 | continue; |
569 | if (r < 0) | |
570 | return r; | |
571 | ||
cf604fd4 LP |
572 | image->discoverable = true; |
573 | ||
c2ce6a3d LP |
574 | r = hashmap_put(h, image->name, image); |
575 | if (r < 0) | |
576 | return r; | |
577 | ||
578 | image = NULL; | |
cd61c3bf LP |
579 | } |
580 | } | |
581 | ||
5ef46e5f | 582 | if (class == IMAGE_MACHINE && !hashmap_contains(h, ".host")) { |
5fc7f358 LP |
583 | _cleanup_(image_unrefp) Image *image = NULL; |
584 | ||
3a6ce860 | 585 | r = image_make(".host", AT_FDCWD, NULL, "/", NULL, &image); |
5fc7f358 LP |
586 | if (r < 0) |
587 | return r; | |
588 | ||
cf604fd4 LP |
589 | image->discoverable = true; |
590 | ||
5fc7f358 LP |
591 | r = hashmap_put(h, image->name, image); |
592 | if (r < 0) | |
593 | return r; | |
594 | ||
595 | image = NULL; | |
5fc7f358 LP |
596 | } |
597 | ||
cd61c3bf LP |
598 | return 0; |
599 | } | |
600 | ||
08682124 | 601 | int image_remove(Image *i) { |
8e766630 | 602 | _cleanup_(release_lock_file) LockFile global_lock = LOCK_FILE_INIT, local_lock = LOCK_FILE_INIT; |
8e0b6570 | 603 | _cleanup_strv_free_ char **settings = NULL; |
bafbac4e | 604 | _cleanup_free_ char *roothash = NULL; |
8e0b6570 | 605 | char **j; |
30535c16 LP |
606 | int r; |
607 | ||
08682124 LP |
608 | assert(i); |
609 | ||
d94c2b06 | 610 | if (IMAGE_IS_VENDOR(i) || IMAGE_IS_HOST(i)) |
08682124 LP |
611 | return -EROFS; |
612 | ||
8e0b6570 LP |
613 | settings = image_settings_path(i); |
614 | if (!settings) | |
615 | return -ENOMEM; | |
616 | ||
bafbac4e LP |
617 | roothash = image_roothash_path(i); |
618 | if (!roothash) | |
619 | return -ENOMEM; | |
620 | ||
30535c16 LP |
621 | /* Make sure we don't interfere with a running nspawn */ |
622 | r = image_path_lock(i->path, LOCK_EX|LOCK_NB, &global_lock, &local_lock); | |
623 | if (r < 0) | |
624 | return r; | |
625 | ||
ebd93cb6 LP |
626 | switch (i->type) { |
627 | ||
628 | case IMAGE_SUBVOLUME: | |
9fb0b9c7 LP |
629 | |
630 | /* Let's unlink first, maybe it is a symlink? If that works we are happy. Otherwise, let's get out the | |
631 | * big guns */ | |
632 | if (unlink(i->path) < 0) { | |
633 | r = btrfs_subvol_remove(i->path, BTRFS_REMOVE_RECURSIVE|BTRFS_REMOVE_QUOTA); | |
634 | if (r < 0) | |
635 | return r; | |
636 | } | |
637 | ||
8e0b6570 | 638 | break; |
ebd93cb6 LP |
639 | |
640 | case IMAGE_DIRECTORY: | |
01b72568 | 641 | /* Allow deletion of read-only directories */ |
db9a4254 | 642 | (void) chattr_path(i->path, 0, FS_IMMUTABLE_FL, NULL); |
8e0b6570 LP |
643 | r = rm_rf(i->path, REMOVE_ROOT|REMOVE_PHYSICAL|REMOVE_SUBVOLUME); |
644 | if (r < 0) | |
645 | return r; | |
646 | ||
647 | break; | |
01b72568 | 648 | |
eb38edce LP |
649 | case IMAGE_BLOCK: |
650 | ||
651 | /* If this is inside of /dev, then it's a real block device, hence let's not touch the device node | |
652 | * itself (but let's remove the stuff stored alongside it). If it's anywhere else, let's try to unlink | |
653 | * the thing (it's most likely a symlink after all). */ | |
654 | ||
655 | if (path_startswith(i->path, "/dev")) | |
656 | break; | |
657 | ||
4831981d | 658 | _fallthrough_; |
aceac2f0 | 659 | case IMAGE_RAW: |
41d1ed05 LP |
660 | if (unlink(i->path) < 0) |
661 | return -errno; | |
8e0b6570 | 662 | break; |
ebd93cb6 LP |
663 | |
664 | default: | |
15411c0c | 665 | return -EOPNOTSUPP; |
ebd93cb6 | 666 | } |
8e0b6570 LP |
667 | |
668 | STRV_FOREACH(j, settings) { | |
669 | if (unlink(*j) < 0 && errno != ENOENT) | |
670 | log_debug_errno(errno, "Failed to unlink %s, ignoring: %m", *j); | |
671 | } | |
672 | ||
bafbac4e LP |
673 | if (unlink(roothash) < 0 && errno != ENOENT) |
674 | log_debug_errno(errno, "Failed to unlink %s, ignoring: %m", roothash); | |
675 | ||
8e0b6570 LP |
676 | return 0; |
677 | } | |
678 | ||
bafbac4e | 679 | static int rename_auxiliary_file(const char *path, const char *new_name, const char *suffix) { |
8e0b6570 LP |
680 | _cleanup_free_ char *rs = NULL; |
681 | const char *fn; | |
682 | ||
bafbac4e | 683 | fn = strjoina(new_name, suffix); |
8e0b6570 LP |
684 | |
685 | rs = file_in_same_dir(path, fn); | |
686 | if (!rs) | |
687 | return -ENOMEM; | |
688 | ||
689 | return rename_noreplace(AT_FDCWD, path, AT_FDCWD, rs); | |
ebd93cb6 LP |
690 | } |
691 | ||
692 | int image_rename(Image *i, const char *new_name) { | |
8e766630 | 693 | _cleanup_(release_lock_file) LockFile global_lock = LOCK_FILE_INIT, local_lock = LOCK_FILE_INIT, name_lock = LOCK_FILE_INIT; |
bafbac4e | 694 | _cleanup_free_ char *new_path = NULL, *nn = NULL, *roothash = NULL; |
8e0b6570 | 695 | _cleanup_strv_free_ char **settings = NULL; |
01b72568 | 696 | unsigned file_attr = 0; |
8e0b6570 | 697 | char **j; |
ebd93cb6 LP |
698 | int r; |
699 | ||
700 | assert(i); | |
701 | ||
702 | if (!image_name_is_valid(new_name)) | |
703 | return -EINVAL; | |
704 | ||
d94c2b06 | 705 | if (IMAGE_IS_VENDOR(i) || IMAGE_IS_HOST(i)) |
ebd93cb6 LP |
706 | return -EROFS; |
707 | ||
8e0b6570 LP |
708 | settings = image_settings_path(i); |
709 | if (!settings) | |
710 | return -ENOMEM; | |
711 | ||
bafbac4e LP |
712 | roothash = image_roothash_path(i); |
713 | if (!roothash) | |
714 | return -ENOMEM; | |
715 | ||
30535c16 LP |
716 | /* Make sure we don't interfere with a running nspawn */ |
717 | r = image_path_lock(i->path, LOCK_EX|LOCK_NB, &global_lock, &local_lock); | |
718 | if (r < 0) | |
719 | return r; | |
720 | ||
721 | /* Make sure nobody takes the new name, between the time we | |
722 | * checked it is currently unused in all search paths, and the | |
f8e2f4d6 | 723 | * time we take possession of it */ |
30535c16 LP |
724 | r = image_name_lock(new_name, LOCK_EX|LOCK_NB, &name_lock); |
725 | if (r < 0) | |
726 | return r; | |
727 | ||
5ef46e5f | 728 | r = image_find(IMAGE_MACHINE, new_name, NULL); |
3a6ce860 | 729 | if (r >= 0) |
ebd93cb6 | 730 | return -EEXIST; |
3a6ce860 LP |
731 | if (r != -ENOENT) |
732 | return r; | |
ebd93cb6 LP |
733 | |
734 | switch (i->type) { | |
735 | ||
ebd93cb6 | 736 | case IMAGE_DIRECTORY: |
01b72568 LP |
737 | /* Turn of the immutable bit while we rename the image, so that we can rename it */ |
738 | (void) read_attr_path(i->path, &file_attr); | |
739 | ||
740 | if (file_attr & FS_IMMUTABLE_FL) | |
db9a4254 | 741 | (void) chattr_path(i->path, 0, FS_IMMUTABLE_FL, NULL); |
01b72568 | 742 | |
4831981d | 743 | _fallthrough_; |
01b72568 | 744 | case IMAGE_SUBVOLUME: |
ebd93cb6 LP |
745 | new_path = file_in_same_dir(i->path, new_name); |
746 | break; | |
747 | ||
eb38edce LP |
748 | case IMAGE_BLOCK: |
749 | ||
750 | /* Refuse renaming raw block devices in /dev, the names are picked by udev after all. */ | |
751 | if (path_startswith(i->path, "/dev")) | |
752 | return -EROFS; | |
753 | ||
754 | new_path = file_in_same_dir(i->path, new_name); | |
755 | break; | |
756 | ||
aceac2f0 | 757 | case IMAGE_RAW: { |
ebd93cb6 LP |
758 | const char *fn; |
759 | ||
63c372cb | 760 | fn = strjoina(new_name, ".raw"); |
ebd93cb6 LP |
761 | new_path = file_in_same_dir(i->path, fn); |
762 | break; | |
763 | } | |
764 | ||
765 | default: | |
15411c0c | 766 | return -EOPNOTSUPP; |
ebd93cb6 LP |
767 | } |
768 | ||
769 | if (!new_path) | |
770 | return -ENOMEM; | |
771 | ||
772 | nn = strdup(new_name); | |
773 | if (!nn) | |
774 | return -ENOMEM; | |
775 | ||
f85ef957 AC |
776 | r = rename_noreplace(AT_FDCWD, i->path, AT_FDCWD, new_path); |
777 | if (r < 0) | |
778 | return r; | |
ebd93cb6 | 779 | |
01b72568 LP |
780 | /* Restore the immutable bit, if it was set before */ |
781 | if (file_attr & FS_IMMUTABLE_FL) | |
db9a4254 | 782 | (void) chattr_path(new_path, FS_IMMUTABLE_FL, FS_IMMUTABLE_FL, NULL); |
01b72568 | 783 | |
f9ecfd3b DL |
784 | free_and_replace(i->path, new_path); |
785 | free_and_replace(i->name, nn); | |
ebd93cb6 | 786 | |
8e0b6570 | 787 | STRV_FOREACH(j, settings) { |
bafbac4e | 788 | r = rename_auxiliary_file(*j, new_name, ".nspawn"); |
8e0b6570 LP |
789 | if (r < 0 && r != -ENOENT) |
790 | log_debug_errno(r, "Failed to rename settings file %s, ignoring: %m", *j); | |
791 | } | |
792 | ||
bafbac4e LP |
793 | r = rename_auxiliary_file(roothash, new_name, ".roothash"); |
794 | if (r < 0 && r != -ENOENT) | |
795 | log_debug_errno(r, "Failed to rename roothash file %s, ignoring: %m", roothash); | |
796 | ||
ebd93cb6 LP |
797 | return 0; |
798 | } | |
799 | ||
bafbac4e | 800 | static int clone_auxiliary_file(const char *path, const char *new_name, const char *suffix) { |
8e0b6570 LP |
801 | _cleanup_free_ char *rs = NULL; |
802 | const char *fn; | |
803 | ||
bafbac4e | 804 | fn = strjoina(new_name, suffix); |
8e0b6570 LP |
805 | |
806 | rs = file_in_same_dir(path, fn); | |
807 | if (!rs) | |
808 | return -ENOMEM; | |
809 | ||
1c876927 | 810 | return copy_file_atomic(path, rs, 0664, 0, COPY_REFLINK); |
8e0b6570 LP |
811 | } |
812 | ||
ebd93cb6 | 813 | int image_clone(Image *i, const char *new_name, bool read_only) { |
8e766630 | 814 | _cleanup_(release_lock_file) LockFile name_lock = LOCK_FILE_INIT; |
8e0b6570 | 815 | _cleanup_strv_free_ char **settings = NULL; |
bafbac4e | 816 | _cleanup_free_ char *roothash = NULL; |
ebd93cb6 | 817 | const char *new_path; |
8e0b6570 | 818 | char **j; |
ebd93cb6 LP |
819 | int r; |
820 | ||
821 | assert(i); | |
822 | ||
823 | if (!image_name_is_valid(new_name)) | |
824 | return -EINVAL; | |
825 | ||
8e0b6570 LP |
826 | settings = image_settings_path(i); |
827 | if (!settings) | |
828 | return -ENOMEM; | |
829 | ||
bafbac4e LP |
830 | roothash = image_roothash_path(i); |
831 | if (!roothash) | |
832 | return -ENOMEM; | |
833 | ||
30535c16 LP |
834 | /* Make sure nobody takes the new name, between the time we |
835 | * checked it is currently unused in all search paths, and the | |
f8e2f4d6 | 836 | * time we take possession of it */ |
30535c16 LP |
837 | r = image_name_lock(new_name, LOCK_EX|LOCK_NB, &name_lock); |
838 | if (r < 0) | |
839 | return r; | |
840 | ||
5ef46e5f | 841 | r = image_find(IMAGE_MACHINE, new_name, NULL); |
3a6ce860 | 842 | if (r >= 0) |
ebd93cb6 | 843 | return -EEXIST; |
3a6ce860 LP |
844 | if (r != -ENOENT) |
845 | return r; | |
ebd93cb6 LP |
846 | |
847 | switch (i->type) { | |
848 | ||
849 | case IMAGE_SUBVOLUME: | |
850 | case IMAGE_DIRECTORY: | |
9a50e3ca | 851 | /* If we can we'll always try to create a new btrfs subvolume here, even if the source is a plain |
13e785f7 | 852 | * directory. */ |
9a50e3ca | 853 | |
63c372cb | 854 | new_path = strjoina("/var/lib/machines/", new_name); |
ebd93cb6 | 855 | |
17cbb288 LP |
856 | r = btrfs_subvol_snapshot(i->path, new_path, |
857 | (read_only ? BTRFS_SNAPSHOT_READ_ONLY : 0) | | |
858 | BTRFS_SNAPSHOT_FALLBACK_COPY | | |
859 | BTRFS_SNAPSHOT_FALLBACK_DIRECTORY | | |
860 | BTRFS_SNAPSHOT_FALLBACK_IMMUTABLE | | |
861 | BTRFS_SNAPSHOT_RECURSIVE | | |
862 | BTRFS_SNAPSHOT_QUOTA); | |
863 | if (r >= 0) | |
9a50e3ca | 864 | /* Enable "subtree" quotas for the copy, if we didn't copy any quota from the source. */ |
8120ee28 | 865 | (void) btrfs_subvol_auto_qgroup(new_path, 0, true); |
5bcd08db | 866 | |
ebd93cb6 LP |
867 | break; |
868 | ||
aceac2f0 | 869 | case IMAGE_RAW: |
63c372cb | 870 | new_path = strjoina("/var/lib/machines/", new_name, ".raw"); |
ebd93cb6 | 871 | |
1c876927 | 872 | r = copy_file_atomic(i->path, new_path, read_only ? 0444 : 0644, FS_NOCOW_FL, COPY_REFLINK); |
ebd93cb6 LP |
873 | break; |
874 | ||
eb38edce | 875 | case IMAGE_BLOCK: |
ebd93cb6 | 876 | default: |
15411c0c | 877 | return -EOPNOTSUPP; |
ebd93cb6 LP |
878 | } |
879 | ||
880 | if (r < 0) | |
881 | return r; | |
882 | ||
8e0b6570 | 883 | STRV_FOREACH(j, settings) { |
bafbac4e | 884 | r = clone_auxiliary_file(*j, new_name, ".nspawn"); |
8e0b6570 LP |
885 | if (r < 0 && r != -ENOENT) |
886 | log_debug_errno(r, "Failed to clone settings %s, ignoring: %m", *j); | |
887 | } | |
888 | ||
bafbac4e LP |
889 | r = clone_auxiliary_file(roothash, new_name, ".roothash"); |
890 | if (r < 0 && r != -ENOENT) | |
891 | log_debug_errno(r, "Failed to clone root hash file %s, ignoring: %m", roothash); | |
892 | ||
ebd93cb6 LP |
893 | return 0; |
894 | } | |
895 | ||
896 | int image_read_only(Image *i, bool b) { | |
8e766630 | 897 | _cleanup_(release_lock_file) LockFile global_lock = LOCK_FILE_INIT, local_lock = LOCK_FILE_INIT; |
ebd93cb6 | 898 | int r; |
c7664c07 | 899 | |
ebd93cb6 LP |
900 | assert(i); |
901 | ||
d94c2b06 | 902 | if (IMAGE_IS_VENDOR(i) || IMAGE_IS_HOST(i)) |
ebd93cb6 LP |
903 | return -EROFS; |
904 | ||
30535c16 LP |
905 | /* Make sure we don't interfere with a running nspawn */ |
906 | r = image_path_lock(i->path, LOCK_EX|LOCK_NB, &global_lock, &local_lock); | |
907 | if (r < 0) | |
908 | return r; | |
909 | ||
ebd93cb6 LP |
910 | switch (i->type) { |
911 | ||
912 | case IMAGE_SUBVOLUME: | |
5bcd08db LP |
913 | |
914 | /* Note that we set the flag only on the top-level | |
915 | * subvolume of the image. */ | |
916 | ||
ebd93cb6 LP |
917 | r = btrfs_subvol_set_read_only(i->path, b); |
918 | if (r < 0) | |
919 | return r; | |
01b72568 LP |
920 | |
921 | break; | |
922 | ||
923 | case IMAGE_DIRECTORY: | |
924 | /* For simple directory trees we cannot use the access | |
925 | mode of the top-level directory, since it has an | |
926 | effect on the container itself. However, we can | |
927 | use the "immutable" flag, to at least make the | |
928 | top-level directory read-only. It's not as good as | |
929 | a read-only subvolume, but at least something, and | |
13e785f7 | 930 | we can read the value back. */ |
01b72568 | 931 | |
db9a4254 | 932 | r = chattr_path(i->path, b ? FS_IMMUTABLE_FL : 0, FS_IMMUTABLE_FL, NULL); |
01b72568 LP |
933 | if (r < 0) |
934 | return r; | |
935 | ||
ebd93cb6 LP |
936 | break; |
937 | ||
aceac2f0 | 938 | case IMAGE_RAW: { |
ebd93cb6 LP |
939 | struct stat st; |
940 | ||
941 | if (stat(i->path, &st) < 0) | |
942 | return -errno; | |
943 | ||
944 | if (chmod(i->path, (st.st_mode & 0444) | (b ? 0000 : 0200)) < 0) | |
945 | return -errno; | |
f2068bcc LP |
946 | |
947 | /* If the images is now read-only, it's a good time to | |
948 | * defrag it, given that no write patterns will | |
949 | * fragment it again. */ | |
950 | if (b) | |
951 | (void) btrfs_defrag(i->path); | |
ebd93cb6 LP |
952 | break; |
953 | } | |
954 | ||
eb38edce LP |
955 | case IMAGE_BLOCK: { |
956 | _cleanup_close_ int fd = -1; | |
957 | struct stat st; | |
958 | int state = b; | |
959 | ||
960 | fd = open(i->path, O_CLOEXEC|O_RDONLY|O_NONBLOCK|O_NOCTTY); | |
961 | if (fd < 0) | |
962 | return -errno; | |
963 | ||
964 | if (fstat(fd, &st) < 0) | |
965 | return -errno; | |
966 | if (!S_ISBLK(st.st_mode)) | |
967 | return -ENOTTY; | |
968 | ||
969 | if (ioctl(fd, BLKROSET, &state) < 0) | |
970 | return -errno; | |
971 | ||
972 | break; | |
973 | } | |
974 | ||
ebd93cb6 | 975 | default: |
15411c0c | 976 | return -EOPNOTSUPP; |
ebd93cb6 LP |
977 | } |
978 | ||
979 | return 0; | |
08682124 LP |
980 | } |
981 | ||
30535c16 LP |
982 | int image_path_lock(const char *path, int operation, LockFile *global, LockFile *local) { |
983 | _cleanup_free_ char *p = NULL; | |
984 | LockFile t = LOCK_FILE_INIT; | |
985 | struct stat st; | |
986 | int r; | |
987 | ||
988 | assert(path); | |
989 | assert(global); | |
990 | assert(local); | |
991 | ||
992 | /* Locks an image path. This actually creates two locks: one | |
993 | * "local" one, next to the image path itself, which might be | |
994 | * shared via NFS. And another "global" one, in /run, that | |
995 | * uses the device/inode number. This has the benefit that we | |
996 | * can even lock a tree that is a mount point, correctly. */ | |
997 | ||
30535c16 LP |
998 | if (!path_is_absolute(path)) |
999 | return -EINVAL; | |
1000 | ||
b6e953f2 LP |
1001 | if (getenv_bool("SYSTEMD_NSPAWN_LOCK") == 0) { |
1002 | *local = *global = (LockFile) LOCK_FILE_INIT; | |
1003 | return 0; | |
1004 | } | |
1005 | ||
1006 | if (path_equal(path, "/")) | |
1007 | return -EBUSY; | |
1008 | ||
30535c16 | 1009 | if (stat(path, &st) >= 0) { |
eb38edce LP |
1010 | if (S_ISBLK(st.st_mode)) |
1011 | r = asprintf(&p, "/run/systemd/nspawn/locks/block-%u:%u", major(st.st_rdev), minor(st.st_rdev)); | |
1012 | else if (S_ISDIR(st.st_mode) || S_ISREG(st.st_mode)) | |
1013 | r = asprintf(&p, "/run/systemd/nspawn/locks/inode-%lu:%lu", (unsigned long) st.st_dev, (unsigned long) st.st_ino); | |
1014 | else | |
1015 | return -ENOTTY; | |
1016 | ||
1017 | if (r < 0) | |
30535c16 LP |
1018 | return -ENOMEM; |
1019 | } | |
1020 | ||
eb38edce LP |
1021 | /* For block devices we don't need the "local" lock, as the major/minor lock above should be sufficient, since |
1022 | * block devices are device local anyway. */ | |
1023 | if (!path_startswith(path, "/dev")) { | |
1024 | r = make_lock_file_for(path, operation, &t); | |
8be17c9b LT |
1025 | if (r < 0) { |
1026 | if ((operation & LOCK_SH) && r == -EROFS) | |
771b7ead | 1027 | log_debug_errno(r, "Failed to create shared lock for '%s', ignoring: %m", path); |
8be17c9b LT |
1028 | else |
1029 | return r; | |
1030 | } | |
eb38edce | 1031 | } |
30535c16 LP |
1032 | |
1033 | if (p) { | |
7e7cddb2 | 1034 | mkdir_p("/run/systemd/nspawn/locks", 0700); |
30535c16 LP |
1035 | |
1036 | r = make_lock_file(p, operation, global); | |
1037 | if (r < 0) { | |
1038 | release_lock_file(&t); | |
1039 | return r; | |
1040 | } | |
546dbec5 LP |
1041 | } else |
1042 | *global = (LockFile) LOCK_FILE_INIT; | |
30535c16 LP |
1043 | |
1044 | *local = t; | |
1045 | return 0; | |
1046 | } | |
1047 | ||
cb81cd80 | 1048 | int image_set_limit(Image *i, uint64_t referenced_max) { |
d6ce17c7 LP |
1049 | assert(i); |
1050 | ||
d94c2b06 | 1051 | if (IMAGE_IS_VENDOR(i) || IMAGE_IS_HOST(i)) |
d6ce17c7 LP |
1052 | return -EROFS; |
1053 | ||
1054 | if (i->type != IMAGE_SUBVOLUME) | |
15411c0c | 1055 | return -EOPNOTSUPP; |
d6ce17c7 | 1056 | |
5bcd08db LP |
1057 | /* We set the quota both for the subvolume as well as for the |
1058 | * subtree. The latter is mostly for historical reasons, since | |
1059 | * we didn't use to have a concept of subtree quota, and hence | |
1060 | * only modified the subvolume quota. */ | |
1061 | ||
1062 | (void) btrfs_qgroup_set_limit(i->path, 0, referenced_max); | |
1063 | (void) btrfs_subvol_auto_qgroup(i->path, 0, true); | |
1064 | return btrfs_subvol_set_subtree_quota_limit(i->path, 0, referenced_max); | |
d6ce17c7 LP |
1065 | } |
1066 | ||
c7664c07 | 1067 | int image_read_metadata(Image *i) { |
8e766630 | 1068 | _cleanup_(release_lock_file) LockFile global_lock = LOCK_FILE_INIT, local_lock = LOCK_FILE_INIT; |
c7664c07 LP |
1069 | int r; |
1070 | ||
1071 | assert(i); | |
1072 | ||
1073 | r = image_path_lock(i->path, LOCK_SH|LOCK_NB, &global_lock, &local_lock); | |
1074 | if (r < 0) | |
1075 | return r; | |
1076 | ||
1077 | switch (i->type) { | |
1078 | ||
1079 | case IMAGE_SUBVOLUME: | |
1080 | case IMAGE_DIRECTORY: { | |
1081 | _cleanup_strv_free_ char **machine_info = NULL, **os_release = NULL; | |
1082 | sd_id128_t machine_id = SD_ID128_NULL; | |
1083 | _cleanup_free_ char *hostname = NULL; | |
1084 | _cleanup_free_ char *path = NULL; | |
1085 | ||
62570f6f | 1086 | r = chase_symlinks("/etc/hostname", i->path, CHASE_PREFIX_ROOT|CHASE_TRAIL_SLASH, &path); |
c7664c07 LP |
1087 | if (r < 0 && r != -ENOENT) |
1088 | log_debug_errno(r, "Failed to chase /etc/hostname in image %s: %m", i->name); | |
1089 | else if (r >= 0) { | |
1090 | r = read_etc_hostname(path, &hostname); | |
1091 | if (r < 0) | |
1092 | log_debug_errno(errno, "Failed to read /etc/hostname of image %s: %m", i->name); | |
1093 | } | |
1094 | ||
1095 | path = mfree(path); | |
1096 | ||
62570f6f | 1097 | r = chase_symlinks("/etc/machine-id", i->path, CHASE_PREFIX_ROOT|CHASE_TRAIL_SLASH, &path); |
c7664c07 LP |
1098 | if (r < 0 && r != -ENOENT) |
1099 | log_debug_errno(r, "Failed to chase /etc/machine-id in image %s: %m", i->name); | |
1100 | else if (r >= 0) { | |
1101 | _cleanup_close_ int fd = -1; | |
1102 | ||
1103 | fd = open(path, O_RDONLY|O_CLOEXEC|O_NOCTTY); | |
1104 | if (fd < 0) | |
1105 | log_debug_errno(errno, "Failed to open %s: %m", path); | |
1106 | else { | |
1107 | r = id128_read_fd(fd, ID128_PLAIN, &machine_id); | |
1108 | if (r < 0) | |
1109 | log_debug_errno(r, "Image %s contains invalid machine ID.", i->name); | |
1110 | } | |
1111 | } | |
1112 | ||
1113 | path = mfree(path); | |
1114 | ||
62570f6f | 1115 | r = chase_symlinks("/etc/machine-info", 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-info in image %s: %m", i->name); | |
1118 | else if (r >= 0) { | |
aa8fbc74 | 1119 | r = load_env_file_pairs(NULL, path, &machine_info); |
c7664c07 LP |
1120 | if (r < 0) |
1121 | log_debug_errno(r, "Failed to parse machine-info data of %s: %m", i->name); | |
1122 | } | |
1123 | ||
d58ad743 LP |
1124 | r = load_os_release_pairs(i->path, &os_release); |
1125 | if (r < 0) | |
1126 | log_debug_errno(r, "Failed to read os-release in image, ignoring: %m"); | |
c7664c07 LP |
1127 | |
1128 | free_and_replace(i->hostname, hostname); | |
1129 | i->machine_id = machine_id; | |
1130 | strv_free_and_replace(i->machine_info, machine_info); | |
1131 | strv_free_and_replace(i->os_release, os_release); | |
1132 | ||
1133 | break; | |
1134 | } | |
1135 | ||
1136 | case IMAGE_RAW: | |
1137 | case IMAGE_BLOCK: { | |
1138 | _cleanup_(loop_device_unrefp) LoopDevice *d = NULL; | |
1139 | _cleanup_(dissected_image_unrefp) DissectedImage *m = NULL; | |
1140 | ||
1141 | r = loop_device_make_by_path(i->path, O_RDONLY, &d); | |
1142 | if (r < 0) | |
1143 | return r; | |
1144 | ||
1145 | r = dissect_image(d->fd, NULL, 0, DISSECT_IMAGE_REQUIRE_ROOT, &m); | |
1146 | if (r < 0) | |
1147 | return r; | |
1148 | ||
1149 | r = dissected_image_acquire_metadata(m); | |
1150 | if (r < 0) | |
1151 | return r; | |
1152 | ||
1153 | free_and_replace(i->hostname, m->hostname); | |
1154 | i->machine_id = m->machine_id; | |
1155 | strv_free_and_replace(i->machine_info, m->machine_info); | |
1156 | strv_free_and_replace(i->os_release, m->os_release); | |
1157 | ||
1158 | break; | |
1159 | } | |
1160 | ||
1161 | default: | |
1162 | return -EOPNOTSUPP; | |
1163 | } | |
1164 | ||
1165 | i->metadata_valid = true; | |
1166 | ||
1167 | return 0; | |
1168 | } | |
1169 | ||
30535c16 LP |
1170 | int image_name_lock(const char *name, int operation, LockFile *ret) { |
1171 | const char *p; | |
1172 | ||
1173 | assert(name); | |
1174 | assert(ret); | |
1175 | ||
1176 | /* Locks an image name, regardless of the precise path used. */ | |
1177 | ||
1178 | if (!image_name_is_valid(name)) | |
1179 | return -EINVAL; | |
1180 | ||
b6e953f2 LP |
1181 | if (getenv_bool("SYSTEMD_NSPAWN_LOCK") == 0) { |
1182 | *ret = (LockFile) LOCK_FILE_INIT; | |
1183 | return 0; | |
1184 | } | |
1185 | ||
30535c16 LP |
1186 | if (streq(name, ".host")) |
1187 | return -EBUSY; | |
1188 | ||
7e7cddb2 | 1189 | mkdir_p("/run/systemd/nspawn/locks", 0700); |
63c372cb | 1190 | p = strjoina("/run/systemd/nspawn/locks/name-", name); |
30535c16 LP |
1191 | |
1192 | return make_lock_file(p, operation, ret); | |
1193 | } | |
1194 | ||
1195 | bool image_name_is_valid(const char *s) { | |
1196 | if (!filename_is_valid(s)) | |
1197 | return false; | |
1198 | ||
1199 | if (string_has_cc(s, NULL)) | |
1200 | return false; | |
1201 | ||
1202 | if (!utf8_is_valid(s)) | |
1203 | return false; | |
1204 | ||
1205 | /* Temporary files for atomically creating new files */ | |
1206 | if (startswith(s, ".#")) | |
1207 | return false; | |
1208 | ||
1209 | return true; | |
1210 | } | |
1211 | ||
ace9ab19 LP |
1212 | bool image_in_search_path(ImageClass class, const char *image) { |
1213 | const char *path; | |
1214 | ||
1215 | assert(image); | |
1216 | ||
1217 | NULSTR_FOREACH(path, image_search_path[class]) { | |
1218 | const char *p; | |
1219 | size_t k; | |
1220 | ||
1221 | p = path_startswith(image, path); | |
1222 | if (!p) | |
1223 | continue; | |
1224 | ||
1225 | /* Make sure there's a filename following */ | |
1226 | k = strcspn(p, "/"); | |
1227 | if (k == 0) | |
1228 | continue; | |
1229 | ||
1230 | p += k; | |
1231 | ||
1232 | /* Accept trailing slashes */ | |
1233 | if (p[strspn(p, "/")] == 0) | |
1234 | return true; | |
1235 | ||
1236 | } | |
1237 | ||
1238 | return false; | |
1239 | } | |
1240 | ||
cd61c3bf LP |
1241 | static const char* const image_type_table[_IMAGE_TYPE_MAX] = { |
1242 | [IMAGE_DIRECTORY] = "directory", | |
1243 | [IMAGE_SUBVOLUME] = "subvolume", | |
aceac2f0 | 1244 | [IMAGE_RAW] = "raw", |
eb38edce | 1245 | [IMAGE_BLOCK] = "block", |
cd61c3bf LP |
1246 | }; |
1247 | ||
1248 | DEFINE_STRING_TABLE_LOOKUP(image_type, ImageType); |