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Commit | Line | Data |
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db9ecf05 | 1 | /* SPDX-License-Identifier: LGPL-2.1-or-later */ |
cd61c3bf | 2 | |
a8fbdf54 | 3 | #include <errno.h> |
ebd93cb6 | 4 | #include <fcntl.h> |
e08f94ac LP |
5 | #include <linux/fs.h> |
6 | #include <linux/loop.h> | |
65ddc2c5 | 7 | #include <linux/magic.h> |
a8fbdf54 TA |
8 | #include <stdio.h> |
9 | #include <stdlib.h> | |
e306723e | 10 | #include <sys/file.h> |
204f52e3 | 11 | #include <sys/ioctl.h> |
a8fbdf54 TA |
12 | #include <sys/stat.h> |
13 | #include <unistd.h> | |
546dbec5 | 14 | |
b5efdb8a | 15 | #include "alloc-util.h" |
cd61c3bf | 16 | #include "btrfs-util.h" |
f461a28d | 17 | #include "chase.h" |
c8b3094d | 18 | #include "chattr-util.h" |
ebd93cb6 | 19 | #include "copy.h" |
a0956174 | 20 | #include "dirent-util.h" |
57f1b61b | 21 | #include "discover-image.h" |
c7664c07 | 22 | #include "dissect-image.h" |
686d13b9 | 23 | #include "env-file.h" |
b6e953f2 | 24 | #include "env-util.h" |
3ffd4af2 | 25 | #include "fd-util.h" |
f4f15635 | 26 | #include "fs-util.h" |
a8fbdf54 | 27 | #include "hashmap.h" |
e2054217 | 28 | #include "hostname-setup.h" |
c7664c07 | 29 | #include "id128-util.h" |
64e89f56 | 30 | #include "lock-util.h" |
a8fbdf54 | 31 | #include "log.h" |
c7664c07 | 32 | #include "loop-util.h" |
546dbec5 | 33 | #include "macro.h" |
30535c16 | 34 | #include "mkdir.h" |
d8b4d14d | 35 | #include "nulstr-util.h" |
d58ad743 | 36 | #include "os-util.h" |
8e0b6570 | 37 | #include "path-util.h" |
c6878637 | 38 | #include "rm-rf.h" |
65ddc2c5 | 39 | #include "stat-util.h" |
8b43440b | 40 | #include "string-table.h" |
07630cea | 41 | #include "string-util.h" |
8e0b6570 | 42 | #include "strv.h" |
a8fbdf54 | 43 | #include "time-util.h" |
8e0b6570 | 44 | #include "utf8.h" |
89a5a90c | 45 | #include "xattr-util.h" |
cd61c3bf | 46 | |
5ef46e5f | 47 | static const char* const image_search_path[_IMAGE_CLASS_MAX] = { |
9bca4ae4 LP |
48 | [IMAGE_MACHINE] = "/etc/machines\0" /* only place symlinks here */ |
49 | "/run/machines\0" /* and here too */ | |
50 | "/var/lib/machines\0" /* the main place for images */ | |
51 | "/var/lib/container\0" /* legacy */ | |
52 | "/usr/local/lib/machines\0" | |
53 | "/usr/lib/machines\0", | |
5ef46e5f | 54 | |
9bca4ae4 LP |
55 | [IMAGE_PORTABLE] = "/etc/portables\0" /* only place symlinks here */ |
56 | "/run/portables\0" /* and here too */ | |
57 | "/var/lib/portables\0" /* the main place for images */ | |
58 | "/usr/local/lib/portables\0" | |
59 | "/usr/lib/portables\0", | |
60 | ||
de862276 LB |
61 | /* Note that we don't allow storing extensions under /usr/, unlike with other image types. That's |
62 | * because extension images are supposed to extend /usr/, so you get into recursive races, especially | |
63 | * with directory-based extensions, as the kernel's OverlayFS explicitly checks for this and errors | |
64 | * out with -ELOOP if it finds that a lowerdir= is a child of another lowerdir=. */ | |
9bca4ae4 LP |
65 | [IMAGE_EXTENSION] = "/etc/extensions\0" /* only place symlinks here */ |
66 | "/run/extensions\0" /* and here too */ | |
de862276 | 67 | "/var/lib/extensions\0", /* the main place for images */ |
5ef46e5f | 68 | }; |
c2ce6a3d | 69 | |
8301aa0b YW |
70 | static Image *image_free(Image *i) { |
71 | assert(i); | |
9614bb06 | 72 | |
cd61c3bf LP |
73 | free(i->name); |
74 | free(i->path); | |
c7664c07 LP |
75 | |
76 | free(i->hostname); | |
77 | strv_free(i->machine_info); | |
78 | strv_free(i->os_release); | |
bcf94222 | 79 | strv_free(i->extension_release); |
c7664c07 | 80 | |
6b430fdb | 81 | return mfree(i); |
cd61c3bf LP |
82 | } |
83 | ||
8301aa0b | 84 | DEFINE_TRIVIAL_REF_UNREF_FUNC(Image, image, image_free); |
b07ec5a1 YW |
85 | DEFINE_HASH_OPS_WITH_VALUE_DESTRUCTOR(image_hash_ops, char, string_hash_func, string_compare_func, |
86 | Image, image_unref); | |
9614bb06 | 87 | |
8e0b6570 LP |
88 | static char **image_settings_path(Image *image) { |
89 | _cleanup_strv_free_ char **l = NULL; | |
162f6477 LP |
90 | _cleanup_free_ char *fn = NULL; |
91 | size_t i = 0; | |
92 | int r; | |
8e0b6570 LP |
93 | |
94 | assert(image); | |
95 | ||
96 | l = new0(char*, 4); | |
97 | if (!l) | |
98 | return NULL; | |
99 | ||
162f6477 LP |
100 | fn = strjoin(image->name, ".nspawn"); |
101 | if (!fn) | |
102 | return NULL; | |
8e0b6570 | 103 | |
b910cc72 LP |
104 | FOREACH_STRING(s, "/etc/systemd/nspawn", "/run/systemd/nspawn") { |
105 | l[i] = path_join(s, fn); | |
8e0b6570 LP |
106 | if (!l[i]) |
107 | return NULL; | |
108 | ||
109 | i++; | |
110 | } | |
111 | ||
162f6477 LP |
112 | r = file_in_same_dir(image->path, fn, l + i); |
113 | if (r == -ENOMEM) | |
8e0b6570 | 114 | return NULL; |
162f6477 LP |
115 | if (r < 0) |
116 | log_debug_errno(r, "Failed to generate .nspawn settings path from image path, ignoring: %m"); | |
117 | ||
118 | strv_uniq(l); | |
8e0b6570 | 119 | |
ae2a15bc | 120 | return TAKE_PTR(l); |
8e0b6570 LP |
121 | } |
122 | ||
162f6477 LP |
123 | static int image_roothash_path(Image *image, char **ret) { |
124 | _cleanup_free_ char *fn = NULL; | |
bafbac4e LP |
125 | |
126 | assert(image); | |
127 | ||
162f6477 LP |
128 | fn = strjoin(image->name, ".roothash"); |
129 | if (!fn) | |
130 | return -ENOMEM; | |
bafbac4e | 131 | |
162f6477 | 132 | return file_in_same_dir(image->path, fn, ret); |
bafbac4e LP |
133 | } |
134 | ||
c2ce6a3d | 135 | static int image_new( |
cd61c3bf | 136 | ImageType t, |
3775e141 | 137 | ImageClass c, |
5fc7f358 | 138 | const char *pretty, |
cd61c3bf | 139 | const char *path, |
5fc7f358 | 140 | const char *filename, |
cd61c3bf | 141 | bool read_only, |
10f9c755 | 142 | usec_t crtime, |
cd61c3bf | 143 | usec_t mtime, |
c2ce6a3d | 144 | Image **ret) { |
cd61c3bf LP |
145 | |
146 | _cleanup_(image_unrefp) Image *i = NULL; | |
cd61c3bf | 147 | |
cd61c3bf LP |
148 | assert(t >= 0); |
149 | assert(t < _IMAGE_TYPE_MAX); | |
5fc7f358 LP |
150 | assert(pretty); |
151 | assert(filename); | |
c2ce6a3d | 152 | assert(ret); |
cd61c3bf | 153 | |
c2108701 | 154 | i = new(Image, 1); |
cd61c3bf LP |
155 | if (!i) |
156 | return -ENOMEM; | |
157 | ||
c2108701 LP |
158 | *i = (Image) { |
159 | .n_ref = 1, | |
160 | .type = t, | |
3775e141 | 161 | .class = c, |
c2108701 LP |
162 | .read_only = read_only, |
163 | .crtime = crtime, | |
164 | .mtime = mtime, | |
165 | .usage = UINT64_MAX, | |
166 | .usage_exclusive = UINT64_MAX, | |
167 | .limit = UINT64_MAX, | |
168 | .limit_exclusive = UINT64_MAX, | |
169 | }; | |
cd61c3bf | 170 | |
5fc7f358 | 171 | i->name = strdup(pretty); |
cd61c3bf LP |
172 | if (!i->name) |
173 | return -ENOMEM; | |
174 | ||
657ee2d8 | 175 | i->path = path_join(path, filename); |
5fc7f358 LP |
176 | if (!i->path) |
177 | return -ENOMEM; | |
178 | ||
4ff361cc | 179 | path_simplify(i->path); |
cd61c3bf | 180 | |
1cc6c93a | 181 | *ret = TAKE_PTR(i); |
c2ce6a3d | 182 | |
cd61c3bf LP |
183 | return 0; |
184 | } | |
185 | ||
4756c94e LP |
186 | static int extract_pretty(const char *path, const char *suffix, char **ret) { |
187 | _cleanup_free_ char *name = NULL; | |
188 | const char *p; | |
4756c94e LP |
189 | |
190 | assert(path); | |
191 | assert(ret); | |
192 | ||
193 | p = last_path_component(path); | |
4756c94e | 194 | |
e8bec624 | 195 | name = strdupcspn(p, "/"); |
4756c94e LP |
196 | if (!name) |
197 | return -ENOMEM; | |
198 | ||
199 | if (suffix) { | |
200 | char *e; | |
201 | ||
202 | e = endswith(name, suffix); | |
203 | if (!e) | |
204 | return -EINVAL; | |
205 | ||
206 | *e = 0; | |
207 | } | |
208 | ||
209 | if (!image_name_is_valid(name)) | |
210 | return -EINVAL; | |
211 | ||
212 | *ret = TAKE_PTR(name); | |
213 | return 0; | |
214 | } | |
215 | ||
5fc7f358 | 216 | static int image_make( |
3775e141 | 217 | ImageClass c, |
5fc7f358 LP |
218 | const char *pretty, |
219 | int dfd, | |
220 | const char *path, | |
221 | const char *filename, | |
3a6ce860 | 222 | const struct stat *st, |
5fc7f358 LP |
223 | Image **ret) { |
224 | ||
2570578d | 225 | _cleanup_free_ char *pretty_buffer = NULL, *parent = NULL; |
3a6ce860 | 226 | struct stat stbuf; |
5fc7f358 | 227 | bool read_only; |
cd61c3bf LP |
228 | int r; |
229 | ||
3a6ce860 | 230 | assert(dfd >= 0 || dfd == AT_FDCWD); |
bcb846f3 | 231 | assert(path || dfd == AT_FDCWD); |
5fc7f358 | 232 | assert(filename); |
cd61c3bf | 233 | |
eb38edce | 234 | /* We explicitly *do* follow symlinks here, since we want to allow symlinking trees, raw files and block |
3a6ce860 LP |
235 | * devices into /var/lib/machines/, and treat them normally. |
236 | * | |
237 | * This function returns -ENOENT if we can't find the image after all, and -EMEDIUMTYPE if it's not a file we | |
238 | * recognize. */ | |
cd61c3bf | 239 | |
3a6ce860 LP |
240 | if (!st) { |
241 | if (fstatat(dfd, filename, &stbuf, 0) < 0) | |
242 | return -errno; | |
243 | ||
244 | st = &stbuf; | |
245 | } | |
cd61c3bf | 246 | |
2570578d LP |
247 | if (!path) { |
248 | if (dfd == AT_FDCWD) | |
249 | (void) safe_getcwd(&parent); | |
250 | else | |
251 | (void) fd_get_path(dfd, &parent); | |
252 | } | |
bcb846f3 | 253 | |
5fc7f358 LP |
254 | read_only = |
255 | (path && path_startswith(path, "/usr")) || | |
08ff5529 | 256 | (faccessat(dfd, filename, W_OK, AT_EACCESS) < 0 && errno == EROFS); |
86e339c8 | 257 | |
3a6ce860 | 258 | if (S_ISDIR(st->st_mode)) { |
254d1313 | 259 | _cleanup_close_ int fd = -EBADF; |
01b72568 | 260 | unsigned file_attr = 0; |
02dcf215 | 261 | usec_t crtime = 0; |
cd61c3bf | 262 | |
c2ce6a3d | 263 | if (!ret) |
3a6ce860 | 264 | return 0; |
cd61c3bf | 265 | |
4756c94e LP |
266 | if (!pretty) { |
267 | r = extract_pretty(filename, NULL, &pretty_buffer); | |
268 | if (r < 0) | |
269 | return r; | |
270 | ||
271 | pretty = pretty_buffer; | |
272 | } | |
5fc7f358 | 273 | |
01b72568 LP |
274 | fd = openat(dfd, filename, O_CLOEXEC|O_NOCTTY|O_DIRECTORY); |
275 | if (fd < 0) | |
276 | return -errno; | |
277 | ||
674b04ff | 278 | if (btrfs_might_be_subvol(st)) { |
cd61c3bf | 279 | |
65ddc2c5 | 280 | r = fd_is_fs_type(fd, BTRFS_SUPER_MAGIC); |
21222ea5 LP |
281 | if (r < 0) |
282 | return r; | |
283 | if (r) { | |
10f9c755 | 284 | BtrfsSubvolInfo info; |
cd61c3bf | 285 | |
c2ce6a3d | 286 | /* It's a btrfs subvolume */ |
cd61c3bf | 287 | |
5bcd08db | 288 | r = btrfs_subvol_get_info_fd(fd, 0, &info); |
10f9c755 LP |
289 | if (r < 0) |
290 | return r; | |
c2ce6a3d LP |
291 | |
292 | r = image_new(IMAGE_SUBVOLUME, | |
3775e141 | 293 | c, |
5fc7f358 | 294 | pretty, |
c2ce6a3d | 295 | path, |
5fc7f358 LP |
296 | filename, |
297 | info.read_only || read_only, | |
10f9c755 | 298 | info.otime, |
c2ce6a3d | 299 | 0, |
c2ce6a3d LP |
300 | ret); |
301 | if (r < 0) | |
302 | return r; | |
303 | ||
5bcd08db LP |
304 | if (btrfs_quota_scan_ongoing(fd) == 0) { |
305 | BtrfsQuotaInfo quota; | |
b6b18498 | 306 | |
5bcd08db LP |
307 | r = btrfs_subvol_get_subtree_quota_fd(fd, 0, "a); |
308 | if (r >= 0) { | |
309 | (*ret)->usage = quota.referenced; | |
310 | (*ret)->usage_exclusive = quota.exclusive; | |
311 | ||
312 | (*ret)->limit = quota.referenced_max; | |
313 | (*ret)->limit_exclusive = quota.exclusive_max; | |
314 | } | |
b6b18498 LP |
315 | } |
316 | ||
3a6ce860 | 317 | return 0; |
cd61c3bf | 318 | } |
c2ce6a3d | 319 | } |
cd61c3bf | 320 | |
02dcf215 | 321 | /* Get directory creation time (not available everywhere, but that's OK */ |
12a7f04a | 322 | (void) fd_getcrtime(fd, &crtime); |
02dcf215 LP |
323 | |
324 | /* If the IMMUTABLE bit is set, we consider the directory read-only. Since the ioctl is not | |
01b72568 LP |
325 | * supported everywhere we ignore failures. */ |
326 | (void) read_attr_fd(fd, &file_attr); | |
cd61c3bf | 327 | |
01b72568 | 328 | /* It's just a normal directory. */ |
c2ce6a3d | 329 | r = image_new(IMAGE_DIRECTORY, |
3775e141 | 330 | c, |
5fc7f358 | 331 | pretty, |
c2ce6a3d | 332 | path, |
5fc7f358 | 333 | filename, |
01b72568 | 334 | read_only || (file_attr & FS_IMMUTABLE_FL), |
02dcf215 LP |
335 | crtime, |
336 | 0, /* we don't use mtime of stat() here, since it's not the time of last change of the tree, but only of the top-level dir */ | |
c2ce6a3d LP |
337 | ret); |
338 | if (r < 0) | |
339 | return r; | |
cd61c3bf | 340 | |
3a6ce860 | 341 | return 0; |
cd61c3bf | 342 | |
3a6ce860 | 343 | } else if (S_ISREG(st->st_mode) && endswith(filename, ".raw")) { |
10f9c755 | 344 | usec_t crtime = 0; |
cd61c3bf | 345 | |
aceac2f0 | 346 | /* It's a RAW disk image */ |
cd61c3bf | 347 | |
c2ce6a3d | 348 | if (!ret) |
3a6ce860 | 349 | return 0; |
cd61c3bf | 350 | |
c53e07e2 | 351 | (void) fd_getcrtime_at(dfd, filename, AT_SYMLINK_FOLLOW, &crtime); |
10f9c755 | 352 | |
4756c94e LP |
353 | if (!pretty) { |
354 | r = extract_pretty(filename, ".raw", &pretty_buffer); | |
355 | if (r < 0) | |
356 | return r; | |
357 | ||
358 | pretty = pretty_buffer; | |
359 | } | |
10f9c755 | 360 | |
aceac2f0 | 361 | r = image_new(IMAGE_RAW, |
3775e141 | 362 | c, |
5fc7f358 | 363 | pretty, |
c2ce6a3d | 364 | path, |
5fc7f358 | 365 | filename, |
3a6ce860 | 366 | !(st->st_mode & 0222) || read_only, |
10f9c755 | 367 | crtime, |
3a6ce860 | 368 | timespec_load(&st->st_mtim), |
c2ce6a3d LP |
369 | ret); |
370 | if (r < 0) | |
371 | return r; | |
cd61c3bf | 372 | |
3a6ce860 LP |
373 | (*ret)->usage = (*ret)->usage_exclusive = st->st_blocks * 512; |
374 | (*ret)->limit = (*ret)->limit_exclusive = st->st_size; | |
b6b18498 | 375 | |
3a6ce860 | 376 | return 0; |
eb38edce | 377 | |
3a6ce860 | 378 | } else if (S_ISBLK(st->st_mode)) { |
254d1313 | 379 | _cleanup_close_ int block_fd = -EBADF; |
eb38edce LP |
380 | uint64_t size = UINT64_MAX; |
381 | ||
382 | /* A block device */ | |
383 | ||
384 | if (!ret) | |
3a6ce860 | 385 | return 0; |
eb38edce | 386 | |
4756c94e LP |
387 | if (!pretty) { |
388 | r = extract_pretty(filename, NULL, &pretty_buffer); | |
389 | if (r < 0) | |
390 | return r; | |
391 | ||
392 | pretty = pretty_buffer; | |
393 | } | |
eb38edce LP |
394 | |
395 | block_fd = openat(dfd, filename, O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_NOCTTY); | |
396 | if (block_fd < 0) | |
2570578d | 397 | log_debug_errno(errno, "Failed to open block device %s/%s, ignoring: %m", path ?: strnull(parent), filename); |
eb38edce | 398 | else { |
3a6ce860 LP |
399 | /* Refresh stat data after opening the node */ |
400 | if (fstat(block_fd, &stbuf) < 0) | |
eb38edce | 401 | return -errno; |
3a6ce860 LP |
402 | st = &stbuf; |
403 | ||
404 | if (!S_ISBLK(st->st_mode)) /* Verify that what we opened is actually what we think it is */ | |
eb38edce LP |
405 | return -ENOTTY; |
406 | ||
407 | if (!read_only) { | |
408 | int state = 0; | |
409 | ||
410 | if (ioctl(block_fd, BLKROGET, &state) < 0) | |
2570578d | 411 | log_debug_errno(errno, "Failed to issue BLKROGET on device %s/%s, ignoring: %m", path ?: strnull(parent), filename); |
eb38edce LP |
412 | else if (state) |
413 | read_only = true; | |
414 | } | |
415 | ||
416 | if (ioctl(block_fd, BLKGETSIZE64, &size) < 0) | |
2570578d | 417 | log_debug_errno(errno, "Failed to issue BLKGETSIZE64 on device %s/%s, ignoring: %m", path ?: strnull(parent), filename); |
eb38edce LP |
418 | |
419 | block_fd = safe_close(block_fd); | |
420 | } | |
421 | ||
422 | r = image_new(IMAGE_BLOCK, | |
3775e141 | 423 | c, |
eb38edce LP |
424 | pretty, |
425 | path, | |
426 | filename, | |
3a6ce860 | 427 | !(st->st_mode & 0222) || read_only, |
eb38edce LP |
428 | 0, |
429 | 0, | |
430 | ret); | |
431 | if (r < 0) | |
432 | return r; | |
433 | ||
ed0cb346 | 434 | if (!IN_SET(size, 0, UINT64_MAX)) |
eb38edce LP |
435 | (*ret)->usage = (*ret)->usage_exclusive = (*ret)->limit = (*ret)->limit_exclusive = size; |
436 | ||
3a6ce860 | 437 | return 0; |
c2ce6a3d | 438 | } |
cd61c3bf | 439 | |
3a6ce860 | 440 | return -EMEDIUMTYPE; |
c2ce6a3d | 441 | } |
cd61c3bf | 442 | |
d577d4a4 LP |
443 | int image_find(ImageClass class, |
444 | const char *name, | |
445 | const char *root, | |
446 | Image **ret) { | |
447 | ||
c2ce6a3d | 448 | int r; |
cd61c3bf | 449 | |
5ef46e5f LP |
450 | assert(class >= 0); |
451 | assert(class < _IMAGE_CLASS_MAX); | |
c2ce6a3d | 452 | assert(name); |
cd61c3bf | 453 | |
c2ce6a3d LP |
454 | /* There are no images with invalid names */ |
455 | if (!image_name_is_valid(name)) | |
3a6ce860 | 456 | return -ENOENT; |
cd61c3bf | 457 | |
5ef46e5f | 458 | NULSTR_FOREACH(path, image_search_path[class]) { |
d577d4a4 | 459 | _cleanup_free_ char *resolved = NULL; |
c2ce6a3d | 460 | _cleanup_closedir_ DIR *d = NULL; |
3a6ce860 | 461 | struct stat st; |
d577d4a4 | 462 | int flags; |
cd61c3bf | 463 | |
f461a28d | 464 | r = chase_and_opendir(path, root, CHASE_PREFIX_ROOT, &resolved, &d); |
d577d4a4 LP |
465 | if (r == -ENOENT) |
466 | continue; | |
467 | if (r < 0) | |
468 | return r; | |
cd61c3bf | 469 | |
d577d4a4 LP |
470 | /* As mentioned above, we follow symlinks on this fstatat(), because we want to permit people |
471 | * to symlink block devices into the search path. (For now, we disable that when operating | |
472 | * relative to some root directory.) */ | |
473 | flags = root ? AT_SYMLINK_NOFOLLOW : 0; | |
474 | if (fstatat(dirfd(d), name, &st, flags) < 0) { | |
aceac2f0 | 475 | _cleanup_free_ char *raw = NULL; |
5fc7f358 | 476 | |
3a6ce860 LP |
477 | if (errno != ENOENT) |
478 | return -errno; | |
479 | ||
b910cc72 | 480 | raw = strjoin(name, ".raw"); |
aceac2f0 | 481 | if (!raw) |
5fc7f358 LP |
482 | return -ENOMEM; |
483 | ||
d577d4a4 | 484 | if (fstatat(dirfd(d), raw, &st, flags) < 0) { |
3a6ce860 LP |
485 | if (errno == ENOENT) |
486 | continue; | |
487 | ||
488 | return -errno; | |
489 | } | |
490 | ||
491 | if (!S_ISREG(st.st_mode)) | |
5fc7f358 | 492 | continue; |
3a6ce860 | 493 | |
3775e141 | 494 | r = image_make(class, name, dirfd(d), resolved, raw, &st, ret); |
3a6ce860 LP |
495 | |
496 | } else { | |
497 | if (!S_ISDIR(st.st_mode) && !S_ISBLK(st.st_mode)) | |
498 | continue; | |
499 | ||
3775e141 | 500 | r = image_make(class, name, dirfd(d), resolved, name, &st, ret); |
5fc7f358 | 501 | } |
3a6ce860 LP |
502 | if (IN_SET(r, -ENOENT, -EMEDIUMTYPE)) |
503 | continue; | |
c2ce6a3d LP |
504 | if (r < 0) |
505 | return r; | |
cd61c3bf | 506 | |
cf604fd4 LP |
507 | if (ret) |
508 | (*ret)->discoverable = true; | |
509 | ||
c2ce6a3d LP |
510 | return 1; |
511 | } | |
512 | ||
cf604fd4 | 513 | if (class == IMAGE_MACHINE && streq(name, ".host")) { |
3775e141 | 514 | r = image_make(class, ".host", AT_FDCWD, NULL, empty_to_root(root), NULL, ret); |
cf604fd4 LP |
515 | if (r < 0) |
516 | return r; | |
517 | ||
518 | if (ret) | |
519 | (*ret)->discoverable = true; | |
520 | ||
521 | return r; | |
522 | } | |
5fc7f358 | 523 | |
3a6ce860 | 524 | return -ENOENT; |
c2ce6a3d LP |
525 | }; |
526 | ||
2ddf182b | 527 | int image_from_path(const char *path, Image **ret) { |
cf604fd4 LP |
528 | |
529 | /* Note that we don't set the 'discoverable' field of the returned object, because we don't check here whether | |
530 | * 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 | 531 | * overridden by another, different image earlier in the search path */ |
cf604fd4 | 532 | |
2ddf182b | 533 | if (path_equal(path, "/")) |
3775e141 | 534 | return image_make(IMAGE_MACHINE, ".host", AT_FDCWD, NULL, "/", NULL, ret); |
2ddf182b | 535 | |
3775e141 | 536 | return image_make(_IMAGE_CLASS_INVALID, NULL, AT_FDCWD, NULL, path, NULL, ret); |
2ddf182b LP |
537 | } |
538 | ||
d577d4a4 | 539 | int image_find_harder(ImageClass class, const char *name_or_path, const char *root, Image **ret) { |
2ddf182b | 540 | if (image_name_is_valid(name_or_path)) |
d577d4a4 | 541 | return image_find(class, name_or_path, root, ret); |
2ddf182b LP |
542 | |
543 | return image_from_path(name_or_path, ret); | |
544 | } | |
545 | ||
d577d4a4 LP |
546 | int image_discover( |
547 | ImageClass class, | |
548 | const char *root, | |
549 | Hashmap *h) { | |
550 | ||
c2ce6a3d LP |
551 | int r; |
552 | ||
5ef46e5f LP |
553 | assert(class >= 0); |
554 | assert(class < _IMAGE_CLASS_MAX); | |
c2ce6a3d LP |
555 | assert(h); |
556 | ||
5ef46e5f | 557 | NULSTR_FOREACH(path, image_search_path[class]) { |
d577d4a4 | 558 | _cleanup_free_ char *resolved = NULL; |
c2ce6a3d | 559 | _cleanup_closedir_ DIR *d = NULL; |
c2ce6a3d | 560 | |
f461a28d | 561 | r = chase_and_opendir(path, root, CHASE_PREFIX_ROOT, &resolved, &d); |
d577d4a4 LP |
562 | if (r == -ENOENT) |
563 | continue; | |
564 | if (r < 0) | |
565 | return r; | |
c2ce6a3d LP |
566 | |
567 | FOREACH_DIRENT_ALL(de, d, return -errno) { | |
568 | _cleanup_(image_unrefp) Image *image = NULL; | |
1bf36bf9 | 569 | _cleanup_free_ char *truncated = NULL; |
3a6ce860 LP |
570 | const char *pretty; |
571 | struct stat st; | |
d577d4a4 | 572 | int flags; |
c2ce6a3d | 573 | |
1bf36bf9 | 574 | if (dot_or_dot_dot(de->d_name)) |
c2ce6a3d LP |
575 | continue; |
576 | ||
d577d4a4 LP |
577 | /* As mentioned above, we follow symlinks on this fstatat(), because we want to |
578 | * permit people to symlink block devices into the search path. */ | |
579 | flags = root ? AT_SYMLINK_NOFOLLOW : 0; | |
580 | if (fstatat(dirfd(d), de->d_name, &st, flags) < 0) { | |
3a6ce860 LP |
581 | if (errno == ENOENT) |
582 | continue; | |
583 | ||
584 | return -errno; | |
585 | } | |
586 | ||
587 | if (S_ISREG(st.st_mode)) { | |
588 | const char *e; | |
589 | ||
590 | e = endswith(de->d_name, ".raw"); | |
591 | if (!e) | |
592 | continue; | |
593 | ||
1bf36bf9 LP |
594 | truncated = strndup(de->d_name, e - de->d_name); |
595 | if (!truncated) | |
596 | return -ENOMEM; | |
597 | ||
598 | pretty = truncated; | |
3a6ce860 | 599 | } else if (S_ISDIR(st.st_mode) || S_ISBLK(st.st_mode)) |
1bf36bf9 | 600 | pretty = de->d_name; |
3a6ce860 LP |
601 | else |
602 | continue; | |
1bf36bf9 LP |
603 | |
604 | if (!image_name_is_valid(pretty)) | |
605 | continue; | |
606 | ||
607 | if (hashmap_contains(h, pretty)) | |
c2ce6a3d LP |
608 | continue; |
609 | ||
3775e141 | 610 | r = image_make(class, pretty, dirfd(d), resolved, de->d_name, &st, &image); |
3a6ce860 | 611 | if (IN_SET(r, -ENOENT, -EMEDIUMTYPE)) |
c2ce6a3d LP |
612 | continue; |
613 | if (r < 0) | |
614 | return r; | |
615 | ||
cf604fd4 LP |
616 | image->discoverable = true; |
617 | ||
c2ce6a3d LP |
618 | r = hashmap_put(h, image->name, image); |
619 | if (r < 0) | |
620 | return r; | |
621 | ||
622 | image = NULL; | |
cd61c3bf LP |
623 | } |
624 | } | |
625 | ||
5ef46e5f | 626 | if (class == IMAGE_MACHINE && !hashmap_contains(h, ".host")) { |
5fc7f358 LP |
627 | _cleanup_(image_unrefp) Image *image = NULL; |
628 | ||
3775e141 | 629 | r = image_make(IMAGE_MACHINE, ".host", AT_FDCWD, NULL, empty_to_root("/"), NULL, &image); |
5fc7f358 LP |
630 | if (r < 0) |
631 | return r; | |
632 | ||
cf604fd4 LP |
633 | image->discoverable = true; |
634 | ||
5fc7f358 LP |
635 | r = hashmap_put(h, image->name, image); |
636 | if (r < 0) | |
637 | return r; | |
638 | ||
639 | image = NULL; | |
5fc7f358 LP |
640 | } |
641 | ||
cd61c3bf LP |
642 | return 0; |
643 | } | |
644 | ||
08682124 | 645 | int image_remove(Image *i) { |
8e766630 | 646 | _cleanup_(release_lock_file) LockFile global_lock = LOCK_FILE_INIT, local_lock = LOCK_FILE_INIT; |
8e0b6570 | 647 | _cleanup_strv_free_ char **settings = NULL; |
bafbac4e | 648 | _cleanup_free_ char *roothash = NULL; |
30535c16 LP |
649 | int r; |
650 | ||
08682124 LP |
651 | assert(i); |
652 | ||
d94c2b06 | 653 | if (IMAGE_IS_VENDOR(i) || IMAGE_IS_HOST(i)) |
08682124 LP |
654 | return -EROFS; |
655 | ||
8e0b6570 LP |
656 | settings = image_settings_path(i); |
657 | if (!settings) | |
658 | return -ENOMEM; | |
659 | ||
162f6477 LP |
660 | r = image_roothash_path(i, &roothash); |
661 | if (r < 0) | |
662 | return r; | |
bafbac4e | 663 | |
30535c16 LP |
664 | /* Make sure we don't interfere with a running nspawn */ |
665 | r = image_path_lock(i->path, LOCK_EX|LOCK_NB, &global_lock, &local_lock); | |
666 | if (r < 0) | |
667 | return r; | |
668 | ||
ebd93cb6 LP |
669 | switch (i->type) { |
670 | ||
671 | case IMAGE_SUBVOLUME: | |
9fb0b9c7 LP |
672 | |
673 | /* Let's unlink first, maybe it is a symlink? If that works we are happy. Otherwise, let's get out the | |
674 | * big guns */ | |
675 | if (unlink(i->path) < 0) { | |
676 | r = btrfs_subvol_remove(i->path, BTRFS_REMOVE_RECURSIVE|BTRFS_REMOVE_QUOTA); | |
677 | if (r < 0) | |
678 | return r; | |
679 | } | |
680 | ||
8e0b6570 | 681 | break; |
ebd93cb6 LP |
682 | |
683 | case IMAGE_DIRECTORY: | |
01b72568 | 684 | /* Allow deletion of read-only directories */ |
db9a4254 | 685 | (void) chattr_path(i->path, 0, FS_IMMUTABLE_FL, NULL); |
8e0b6570 LP |
686 | r = rm_rf(i->path, REMOVE_ROOT|REMOVE_PHYSICAL|REMOVE_SUBVOLUME); |
687 | if (r < 0) | |
688 | return r; | |
689 | ||
690 | break; | |
01b72568 | 691 | |
eb38edce LP |
692 | case IMAGE_BLOCK: |
693 | ||
694 | /* If this is inside of /dev, then it's a real block device, hence let's not touch the device node | |
695 | * itself (but let's remove the stuff stored alongside it). If it's anywhere else, let's try to unlink | |
696 | * the thing (it's most likely a symlink after all). */ | |
697 | ||
698 | if (path_startswith(i->path, "/dev")) | |
699 | break; | |
700 | ||
4831981d | 701 | _fallthrough_; |
aceac2f0 | 702 | case IMAGE_RAW: |
41d1ed05 LP |
703 | if (unlink(i->path) < 0) |
704 | return -errno; | |
8e0b6570 | 705 | break; |
ebd93cb6 LP |
706 | |
707 | default: | |
15411c0c | 708 | return -EOPNOTSUPP; |
ebd93cb6 | 709 | } |
8e0b6570 | 710 | |
de010b0b | 711 | STRV_FOREACH(j, settings) |
8e0b6570 LP |
712 | if (unlink(*j) < 0 && errno != ENOENT) |
713 | log_debug_errno(errno, "Failed to unlink %s, ignoring: %m", *j); | |
8e0b6570 | 714 | |
bafbac4e LP |
715 | if (unlink(roothash) < 0 && errno != ENOENT) |
716 | log_debug_errno(errno, "Failed to unlink %s, ignoring: %m", roothash); | |
717 | ||
8e0b6570 LP |
718 | return 0; |
719 | } | |
720 | ||
bafbac4e | 721 | static int rename_auxiliary_file(const char *path, const char *new_name, const char *suffix) { |
162f6477 LP |
722 | _cleanup_free_ char *fn = NULL, *rs = NULL; |
723 | int r; | |
8e0b6570 | 724 | |
162f6477 LP |
725 | fn = strjoin(new_name, suffix); |
726 | if (!fn) | |
8e0b6570 LP |
727 | return -ENOMEM; |
728 | ||
162f6477 LP |
729 | r = file_in_same_dir(path, fn, &rs); |
730 | if (r < 0) | |
731 | return r; | |
732 | ||
8e0b6570 | 733 | return rename_noreplace(AT_FDCWD, path, AT_FDCWD, rs); |
ebd93cb6 LP |
734 | } |
735 | ||
736 | int image_rename(Image *i, const char *new_name) { | |
8e766630 | 737 | _cleanup_(release_lock_file) LockFile global_lock = LOCK_FILE_INIT, local_lock = LOCK_FILE_INIT, name_lock = LOCK_FILE_INIT; |
bafbac4e | 738 | _cleanup_free_ char *new_path = NULL, *nn = NULL, *roothash = NULL; |
8e0b6570 | 739 | _cleanup_strv_free_ char **settings = NULL; |
01b72568 | 740 | unsigned file_attr = 0; |
ebd93cb6 LP |
741 | int r; |
742 | ||
743 | assert(i); | |
744 | ||
745 | if (!image_name_is_valid(new_name)) | |
746 | return -EINVAL; | |
747 | ||
d94c2b06 | 748 | if (IMAGE_IS_VENDOR(i) || IMAGE_IS_HOST(i)) |
ebd93cb6 LP |
749 | return -EROFS; |
750 | ||
8e0b6570 LP |
751 | settings = image_settings_path(i); |
752 | if (!settings) | |
753 | return -ENOMEM; | |
754 | ||
162f6477 LP |
755 | r = image_roothash_path(i, &roothash); |
756 | if (r < 0) | |
757 | return r; | |
bafbac4e | 758 | |
30535c16 LP |
759 | /* Make sure we don't interfere with a running nspawn */ |
760 | r = image_path_lock(i->path, LOCK_EX|LOCK_NB, &global_lock, &local_lock); | |
761 | if (r < 0) | |
762 | return r; | |
763 | ||
764 | /* Make sure nobody takes the new name, between the time we | |
765 | * checked it is currently unused in all search paths, and the | |
f8e2f4d6 | 766 | * time we take possession of it */ |
30535c16 LP |
767 | r = image_name_lock(new_name, LOCK_EX|LOCK_NB, &name_lock); |
768 | if (r < 0) | |
769 | return r; | |
770 | ||
d577d4a4 | 771 | r = image_find(IMAGE_MACHINE, new_name, NULL, NULL); |
3a6ce860 | 772 | if (r >= 0) |
ebd93cb6 | 773 | return -EEXIST; |
3a6ce860 LP |
774 | if (r != -ENOENT) |
775 | return r; | |
ebd93cb6 LP |
776 | |
777 | switch (i->type) { | |
778 | ||
ebd93cb6 | 779 | case IMAGE_DIRECTORY: |
01b72568 LP |
780 | /* Turn of the immutable bit while we rename the image, so that we can rename it */ |
781 | (void) read_attr_path(i->path, &file_attr); | |
782 | ||
783 | if (file_attr & FS_IMMUTABLE_FL) | |
db9a4254 | 784 | (void) chattr_path(i->path, 0, FS_IMMUTABLE_FL, NULL); |
01b72568 | 785 | |
4831981d | 786 | _fallthrough_; |
01b72568 | 787 | case IMAGE_SUBVOLUME: |
162f6477 | 788 | r = file_in_same_dir(i->path, new_name, &new_path); |
ebd93cb6 LP |
789 | break; |
790 | ||
eb38edce LP |
791 | case IMAGE_BLOCK: |
792 | ||
793 | /* Refuse renaming raw block devices in /dev, the names are picked by udev after all. */ | |
794 | if (path_startswith(i->path, "/dev")) | |
795 | return -EROFS; | |
796 | ||
162f6477 | 797 | r = file_in_same_dir(i->path, new_name, &new_path); |
eb38edce LP |
798 | break; |
799 | ||
aceac2f0 | 800 | case IMAGE_RAW: { |
ebd93cb6 LP |
801 | const char *fn; |
802 | ||
63c372cb | 803 | fn = strjoina(new_name, ".raw"); |
162f6477 LP |
804 | |
805 | r = file_in_same_dir(i->path, fn, &new_path); | |
ebd93cb6 LP |
806 | break; |
807 | } | |
808 | ||
809 | default: | |
15411c0c | 810 | return -EOPNOTSUPP; |
ebd93cb6 | 811 | } |
162f6477 LP |
812 | if (r < 0) |
813 | return r; | |
ebd93cb6 LP |
814 | |
815 | nn = strdup(new_name); | |
816 | if (!nn) | |
817 | return -ENOMEM; | |
818 | ||
f85ef957 AC |
819 | r = rename_noreplace(AT_FDCWD, i->path, AT_FDCWD, new_path); |
820 | if (r < 0) | |
821 | return r; | |
ebd93cb6 | 822 | |
01b72568 LP |
823 | /* Restore the immutable bit, if it was set before */ |
824 | if (file_attr & FS_IMMUTABLE_FL) | |
db9a4254 | 825 | (void) chattr_path(new_path, FS_IMMUTABLE_FL, FS_IMMUTABLE_FL, NULL); |
01b72568 | 826 | |
f9ecfd3b DL |
827 | free_and_replace(i->path, new_path); |
828 | free_and_replace(i->name, nn); | |
ebd93cb6 | 829 | |
8e0b6570 | 830 | STRV_FOREACH(j, settings) { |
bafbac4e | 831 | r = rename_auxiliary_file(*j, new_name, ".nspawn"); |
8e0b6570 LP |
832 | if (r < 0 && r != -ENOENT) |
833 | log_debug_errno(r, "Failed to rename settings file %s, ignoring: %m", *j); | |
834 | } | |
835 | ||
bafbac4e LP |
836 | r = rename_auxiliary_file(roothash, new_name, ".roothash"); |
837 | if (r < 0 && r != -ENOENT) | |
838 | log_debug_errno(r, "Failed to rename roothash file %s, ignoring: %m", roothash); | |
839 | ||
ebd93cb6 LP |
840 | return 0; |
841 | } | |
842 | ||
bafbac4e | 843 | static int clone_auxiliary_file(const char *path, const char *new_name, const char *suffix) { |
162f6477 LP |
844 | _cleanup_free_ char *fn = NULL, *rs = NULL; |
845 | int r; | |
8e0b6570 | 846 | |
162f6477 LP |
847 | fn = strjoin(new_name, suffix); |
848 | if (!fn) | |
8e0b6570 LP |
849 | return -ENOMEM; |
850 | ||
162f6477 LP |
851 | r = file_in_same_dir(path, fn, &rs); |
852 | if (r < 0) | |
853 | return r; | |
854 | ||
7c2f5495 | 855 | return copy_file_atomic(path, rs, 0664, COPY_REFLINK); |
8e0b6570 LP |
856 | } |
857 | ||
ebd93cb6 | 858 | int image_clone(Image *i, const char *new_name, bool read_only) { |
8e766630 | 859 | _cleanup_(release_lock_file) LockFile name_lock = LOCK_FILE_INIT; |
8e0b6570 | 860 | _cleanup_strv_free_ char **settings = NULL; |
bafbac4e | 861 | _cleanup_free_ char *roothash = NULL; |
ebd93cb6 LP |
862 | const char *new_path; |
863 | int r; | |
864 | ||
865 | assert(i); | |
866 | ||
867 | if (!image_name_is_valid(new_name)) | |
868 | return -EINVAL; | |
869 | ||
8e0b6570 LP |
870 | settings = image_settings_path(i); |
871 | if (!settings) | |
872 | return -ENOMEM; | |
873 | ||
162f6477 LP |
874 | r = image_roothash_path(i, &roothash); |
875 | if (r < 0) | |
876 | return r; | |
bafbac4e | 877 | |
30535c16 LP |
878 | /* Make sure nobody takes the new name, between the time we |
879 | * checked it is currently unused in all search paths, and the | |
f8e2f4d6 | 880 | * time we take possession of it */ |
30535c16 LP |
881 | r = image_name_lock(new_name, LOCK_EX|LOCK_NB, &name_lock); |
882 | if (r < 0) | |
883 | return r; | |
884 | ||
d577d4a4 | 885 | r = image_find(IMAGE_MACHINE, new_name, NULL, NULL); |
3a6ce860 | 886 | if (r >= 0) |
ebd93cb6 | 887 | return -EEXIST; |
3a6ce860 LP |
888 | if (r != -ENOENT) |
889 | return r; | |
ebd93cb6 LP |
890 | |
891 | switch (i->type) { | |
892 | ||
893 | case IMAGE_SUBVOLUME: | |
894 | case IMAGE_DIRECTORY: | |
9a50e3ca | 895 | /* If we can we'll always try to create a new btrfs subvolume here, even if the source is a plain |
13e785f7 | 896 | * directory. */ |
9a50e3ca | 897 | |
63c372cb | 898 | new_path = strjoina("/var/lib/machines/", new_name); |
ebd93cb6 | 899 | |
17cbb288 LP |
900 | r = btrfs_subvol_snapshot(i->path, new_path, |
901 | (read_only ? BTRFS_SNAPSHOT_READ_ONLY : 0) | | |
902 | BTRFS_SNAPSHOT_FALLBACK_COPY | | |
903 | BTRFS_SNAPSHOT_FALLBACK_DIRECTORY | | |
904 | BTRFS_SNAPSHOT_FALLBACK_IMMUTABLE | | |
905 | BTRFS_SNAPSHOT_RECURSIVE | | |
906 | BTRFS_SNAPSHOT_QUOTA); | |
907 | if (r >= 0) | |
9a50e3ca | 908 | /* Enable "subtree" quotas for the copy, if we didn't copy any quota from the source. */ |
8120ee28 | 909 | (void) btrfs_subvol_auto_qgroup(new_path, 0, true); |
5bcd08db | 910 | |
ebd93cb6 LP |
911 | break; |
912 | ||
aceac2f0 | 913 | case IMAGE_RAW: |
63c372cb | 914 | new_path = strjoina("/var/lib/machines/", new_name, ".raw"); |
ebd93cb6 | 915 | |
7c2f5495 DDM |
916 | r = copy_file_atomic_full(i->path, new_path, read_only ? 0444 : 0644, FS_NOCOW_FL, FS_NOCOW_FL, |
917 | COPY_REFLINK|COPY_CRTIME, NULL, NULL); | |
ebd93cb6 LP |
918 | break; |
919 | ||
eb38edce | 920 | case IMAGE_BLOCK: |
ebd93cb6 | 921 | default: |
15411c0c | 922 | return -EOPNOTSUPP; |
ebd93cb6 LP |
923 | } |
924 | ||
925 | if (r < 0) | |
926 | return r; | |
927 | ||
8e0b6570 | 928 | STRV_FOREACH(j, settings) { |
bafbac4e | 929 | r = clone_auxiliary_file(*j, new_name, ".nspawn"); |
8e0b6570 LP |
930 | if (r < 0 && r != -ENOENT) |
931 | log_debug_errno(r, "Failed to clone settings %s, ignoring: %m", *j); | |
932 | } | |
933 | ||
bafbac4e LP |
934 | r = clone_auxiliary_file(roothash, new_name, ".roothash"); |
935 | if (r < 0 && r != -ENOENT) | |
936 | log_debug_errno(r, "Failed to clone root hash file %s, ignoring: %m", roothash); | |
937 | ||
ebd93cb6 LP |
938 | return 0; |
939 | } | |
940 | ||
941 | int image_read_only(Image *i, bool b) { | |
8e766630 | 942 | _cleanup_(release_lock_file) LockFile global_lock = LOCK_FILE_INIT, local_lock = LOCK_FILE_INIT; |
ebd93cb6 | 943 | int r; |
c7664c07 | 944 | |
ebd93cb6 LP |
945 | assert(i); |
946 | ||
d94c2b06 | 947 | if (IMAGE_IS_VENDOR(i) || IMAGE_IS_HOST(i)) |
ebd93cb6 LP |
948 | return -EROFS; |
949 | ||
30535c16 LP |
950 | /* Make sure we don't interfere with a running nspawn */ |
951 | r = image_path_lock(i->path, LOCK_EX|LOCK_NB, &global_lock, &local_lock); | |
952 | if (r < 0) | |
953 | return r; | |
954 | ||
ebd93cb6 LP |
955 | switch (i->type) { |
956 | ||
957 | case IMAGE_SUBVOLUME: | |
5bcd08db LP |
958 | |
959 | /* Note that we set the flag only on the top-level | |
960 | * subvolume of the image. */ | |
961 | ||
ebd93cb6 LP |
962 | r = btrfs_subvol_set_read_only(i->path, b); |
963 | if (r < 0) | |
964 | return r; | |
01b72568 LP |
965 | |
966 | break; | |
967 | ||
968 | case IMAGE_DIRECTORY: | |
969 | /* For simple directory trees we cannot use the access | |
970 | mode of the top-level directory, since it has an | |
971 | effect on the container itself. However, we can | |
972 | use the "immutable" flag, to at least make the | |
973 | top-level directory read-only. It's not as good as | |
974 | a read-only subvolume, but at least something, and | |
13e785f7 | 975 | we can read the value back. */ |
01b72568 | 976 | |
db9a4254 | 977 | r = chattr_path(i->path, b ? FS_IMMUTABLE_FL : 0, FS_IMMUTABLE_FL, NULL); |
01b72568 LP |
978 | if (r < 0) |
979 | return r; | |
980 | ||
ebd93cb6 LP |
981 | break; |
982 | ||
aceac2f0 | 983 | case IMAGE_RAW: { |
ebd93cb6 LP |
984 | struct stat st; |
985 | ||
986 | if (stat(i->path, &st) < 0) | |
987 | return -errno; | |
988 | ||
989 | if (chmod(i->path, (st.st_mode & 0444) | (b ? 0000 : 0200)) < 0) | |
990 | return -errno; | |
f2068bcc LP |
991 | |
992 | /* If the images is now read-only, it's a good time to | |
993 | * defrag it, given that no write patterns will | |
994 | * fragment it again. */ | |
995 | if (b) | |
996 | (void) btrfs_defrag(i->path); | |
ebd93cb6 LP |
997 | break; |
998 | } | |
999 | ||
eb38edce | 1000 | case IMAGE_BLOCK: { |
254d1313 | 1001 | _cleanup_close_ int fd = -EBADF; |
eb38edce LP |
1002 | struct stat st; |
1003 | int state = b; | |
1004 | ||
1005 | fd = open(i->path, O_CLOEXEC|O_RDONLY|O_NONBLOCK|O_NOCTTY); | |
1006 | if (fd < 0) | |
1007 | return -errno; | |
1008 | ||
1009 | if (fstat(fd, &st) < 0) | |
1010 | return -errno; | |
1011 | if (!S_ISBLK(st.st_mode)) | |
1012 | return -ENOTTY; | |
1013 | ||
1014 | if (ioctl(fd, BLKROSET, &state) < 0) | |
1015 | return -errno; | |
1016 | ||
1017 | break; | |
1018 | } | |
1019 | ||
ebd93cb6 | 1020 | default: |
15411c0c | 1021 | return -EOPNOTSUPP; |
ebd93cb6 LP |
1022 | } |
1023 | ||
1024 | return 0; | |
08682124 LP |
1025 | } |
1026 | ||
30535c16 LP |
1027 | int image_path_lock(const char *path, int operation, LockFile *global, LockFile *local) { |
1028 | _cleanup_free_ char *p = NULL; | |
1029 | LockFile t = LOCK_FILE_INIT; | |
1030 | struct stat st; | |
f25bed67 | 1031 | bool exclusive; |
30535c16 LP |
1032 | int r; |
1033 | ||
1034 | assert(path); | |
1035 | assert(global); | |
1036 | assert(local); | |
1037 | ||
f25bed67 LP |
1038 | /* Locks an image path. This actually creates two locks: one "local" one, next to the image path |
1039 | * itself, which might be shared via NFS. And another "global" one, in /run, that uses the | |
1040 | * device/inode number. This has the benefit that we can even lock a tree that is a mount point, | |
1041 | * correctly. */ | |
30535c16 | 1042 | |
30535c16 LP |
1043 | if (!path_is_absolute(path)) |
1044 | return -EINVAL; | |
1045 | ||
f25bed67 LP |
1046 | switch (operation & (LOCK_SH|LOCK_EX)) { |
1047 | case LOCK_SH: | |
1048 | exclusive = false; | |
1049 | break; | |
1050 | case LOCK_EX: | |
1051 | exclusive = true; | |
1052 | break; | |
1053 | default: | |
1054 | return -EINVAL; | |
1055 | } | |
1056 | ||
b6e953f2 LP |
1057 | if (getenv_bool("SYSTEMD_NSPAWN_LOCK") == 0) { |
1058 | *local = *global = (LockFile) LOCK_FILE_INIT; | |
1059 | return 0; | |
1060 | } | |
1061 | ||
f25bed67 LP |
1062 | /* Prohibit taking exclusive locks on the host image. We can't allow this, since we ourselves are |
1063 | * running off it after all, and we don't want any images to manipulate the host image. We make an | |
1064 | * exception for shared locks however: we allow those (and make them NOPs since there's no point in | |
1065 | * taking them if there can't be exclusive locks). Strictly speaking these are questionable as well, | |
1066 | * since it means changes made to the host might propagate to the container as they happen (and a | |
1067 | * shared lock kinda suggests that no changes happen at all while it is in place), but it's too | |
1068 | * useful not to allow read-only containers off the host root, hence let's support this, and trust | |
1069 | * the user to do the right thing with this. */ | |
1070 | if (path_equal(path, "/")) { | |
1071 | if (exclusive) | |
1072 | return -EBUSY; | |
1073 | ||
1074 | *local = *global = (LockFile) LOCK_FILE_INIT; | |
1075 | return 0; | |
1076 | } | |
b6e953f2 | 1077 | |
30535c16 | 1078 | if (stat(path, &st) >= 0) { |
eb38edce LP |
1079 | if (S_ISBLK(st.st_mode)) |
1080 | r = asprintf(&p, "/run/systemd/nspawn/locks/block-%u:%u", major(st.st_rdev), minor(st.st_rdev)); | |
1081 | else if (S_ISDIR(st.st_mode) || S_ISREG(st.st_mode)) | |
1082 | r = asprintf(&p, "/run/systemd/nspawn/locks/inode-%lu:%lu", (unsigned long) st.st_dev, (unsigned long) st.st_ino); | |
1083 | else | |
1084 | return -ENOTTY; | |
eb38edce | 1085 | if (r < 0) |
30535c16 LP |
1086 | return -ENOMEM; |
1087 | } | |
1088 | ||
f25bed67 LP |
1089 | /* For block devices we don't need the "local" lock, as the major/minor lock above should be |
1090 | * sufficient, since block devices are host local anyway. */ | |
1091 | if (!path_startswith(path, "/dev/")) { | |
eb38edce | 1092 | r = make_lock_file_for(path, operation, &t); |
8be17c9b | 1093 | if (r < 0) { |
f25bed67 | 1094 | if (!exclusive && r == -EROFS) |
771b7ead | 1095 | log_debug_errno(r, "Failed to create shared lock for '%s', ignoring: %m", path); |
8be17c9b LT |
1096 | else |
1097 | return r; | |
1098 | } | |
eb38edce | 1099 | } |
30535c16 LP |
1100 | |
1101 | if (p) { | |
6e5dcce4 | 1102 | (void) mkdir_p("/run/systemd/nspawn/locks", 0700); |
30535c16 LP |
1103 | |
1104 | r = make_lock_file(p, operation, global); | |
1105 | if (r < 0) { | |
1106 | release_lock_file(&t); | |
1107 | return r; | |
1108 | } | |
546dbec5 LP |
1109 | } else |
1110 | *global = (LockFile) LOCK_FILE_INIT; | |
30535c16 LP |
1111 | |
1112 | *local = t; | |
1113 | return 0; | |
1114 | } | |
1115 | ||
cb81cd80 | 1116 | int image_set_limit(Image *i, uint64_t referenced_max) { |
d6ce17c7 LP |
1117 | assert(i); |
1118 | ||
d94c2b06 | 1119 | if (IMAGE_IS_VENDOR(i) || IMAGE_IS_HOST(i)) |
d6ce17c7 LP |
1120 | return -EROFS; |
1121 | ||
1122 | if (i->type != IMAGE_SUBVOLUME) | |
15411c0c | 1123 | return -EOPNOTSUPP; |
d6ce17c7 | 1124 | |
5bcd08db LP |
1125 | /* We set the quota both for the subvolume as well as for the |
1126 | * subtree. The latter is mostly for historical reasons, since | |
1127 | * we didn't use to have a concept of subtree quota, and hence | |
1128 | * only modified the subvolume quota. */ | |
1129 | ||
1130 | (void) btrfs_qgroup_set_limit(i->path, 0, referenced_max); | |
1131 | (void) btrfs_subvol_auto_qgroup(i->path, 0, true); | |
1132 | return btrfs_subvol_set_subtree_quota_limit(i->path, 0, referenced_max); | |
d6ce17c7 LP |
1133 | } |
1134 | ||
c7664c07 | 1135 | int image_read_metadata(Image *i) { |
8e766630 | 1136 | _cleanup_(release_lock_file) LockFile global_lock = LOCK_FILE_INIT, local_lock = LOCK_FILE_INIT; |
c7664c07 LP |
1137 | int r; |
1138 | ||
1139 | assert(i); | |
1140 | ||
1141 | r = image_path_lock(i->path, LOCK_SH|LOCK_NB, &global_lock, &local_lock); | |
1142 | if (r < 0) | |
1143 | return r; | |
1144 | ||
1145 | switch (i->type) { | |
1146 | ||
1147 | case IMAGE_SUBVOLUME: | |
1148 | case IMAGE_DIRECTORY: { | |
bcf94222 | 1149 | _cleanup_strv_free_ char **machine_info = NULL, **os_release = NULL, **extension_release = NULL; |
c7664c07 LP |
1150 | sd_id128_t machine_id = SD_ID128_NULL; |
1151 | _cleanup_free_ char *hostname = NULL; | |
1152 | _cleanup_free_ char *path = NULL; | |
1153 | ||
f461a28d | 1154 | r = chase("/etc/hostname", i->path, CHASE_PREFIX_ROOT|CHASE_TRAIL_SLASH, &path, NULL); |
c7664c07 LP |
1155 | if (r < 0 && r != -ENOENT) |
1156 | log_debug_errno(r, "Failed to chase /etc/hostname in image %s: %m", i->name); | |
1157 | else if (r >= 0) { | |
1158 | r = read_etc_hostname(path, &hostname); | |
1159 | if (r < 0) | |
1160 | log_debug_errno(errno, "Failed to read /etc/hostname of image %s: %m", i->name); | |
1161 | } | |
1162 | ||
1163 | path = mfree(path); | |
1164 | ||
f461a28d | 1165 | r = chase("/etc/machine-id", i->path, CHASE_PREFIX_ROOT|CHASE_TRAIL_SLASH, &path, NULL); |
c7664c07 LP |
1166 | if (r < 0 && r != -ENOENT) |
1167 | log_debug_errno(r, "Failed to chase /etc/machine-id in image %s: %m", i->name); | |
1168 | else if (r >= 0) { | |
254d1313 | 1169 | _cleanup_close_ int fd = -EBADF; |
c7664c07 LP |
1170 | |
1171 | fd = open(path, O_RDONLY|O_CLOEXEC|O_NOCTTY); | |
1172 | if (fd < 0) | |
1173 | log_debug_errno(errno, "Failed to open %s: %m", path); | |
1174 | else { | |
057bf780 | 1175 | r = id128_read_fd(fd, ID128_FORMAT_PLAIN, &machine_id); |
c7664c07 LP |
1176 | if (r < 0) |
1177 | log_debug_errno(r, "Image %s contains invalid machine ID.", i->name); | |
1178 | } | |
1179 | } | |
1180 | ||
1181 | path = mfree(path); | |
1182 | ||
f461a28d | 1183 | r = chase("/etc/machine-info", i->path, CHASE_PREFIX_ROOT|CHASE_TRAIL_SLASH, &path, NULL); |
c7664c07 LP |
1184 | if (r < 0 && r != -ENOENT) |
1185 | log_debug_errno(r, "Failed to chase /etc/machine-info in image %s: %m", i->name); | |
1186 | else if (r >= 0) { | |
aa8fbc74 | 1187 | r = load_env_file_pairs(NULL, path, &machine_info); |
c7664c07 LP |
1188 | if (r < 0) |
1189 | log_debug_errno(r, "Failed to parse machine-info data of %s: %m", i->name); | |
1190 | } | |
1191 | ||
d58ad743 LP |
1192 | r = load_os_release_pairs(i->path, &os_release); |
1193 | if (r < 0) | |
1194 | log_debug_errno(r, "Failed to read os-release in image, ignoring: %m"); | |
c7664c07 | 1195 | |
06768b90 | 1196 | r = load_extension_release_pairs(i->path, i->name, /* relax_extension_release_check= */ false, &extension_release); |
bcf94222 LB |
1197 | if (r < 0) |
1198 | log_debug_errno(r, "Failed to read extension-release in image, ignoring: %m"); | |
1199 | ||
c7664c07 LP |
1200 | free_and_replace(i->hostname, hostname); |
1201 | i->machine_id = machine_id; | |
1202 | strv_free_and_replace(i->machine_info, machine_info); | |
1203 | strv_free_and_replace(i->os_release, os_release); | |
bcf94222 | 1204 | strv_free_and_replace(i->extension_release, extension_release); |
c7664c07 LP |
1205 | |
1206 | break; | |
1207 | } | |
1208 | ||
1209 | case IMAGE_RAW: | |
1210 | case IMAGE_BLOCK: { | |
1211 | _cleanup_(loop_device_unrefp) LoopDevice *d = NULL; | |
1212 | _cleanup_(dissected_image_unrefp) DissectedImage *m = NULL; | |
1213 | ||
22ee78a8 | 1214 | r = loop_device_make_by_path(i->path, O_RDONLY, /* sector_size= */ UINT32_MAX, LO_FLAGS_PARTSCAN, LOCK_SH, &d); |
41bc4849 LP |
1215 | if (r < 0) |
1216 | return r; | |
1217 | ||
bad31660 YW |
1218 | r = dissect_loop_device( |
1219 | d, | |
d04faa4e | 1220 | NULL, NULL, |
4b5de5dd LP |
1221 | DISSECT_IMAGE_GENERIC_ROOT | |
1222 | DISSECT_IMAGE_REQUIRE_ROOT | | |
1223 | DISSECT_IMAGE_RELAX_VAR_CHECK | | |
f6f4ec79 | 1224 | DISSECT_IMAGE_READ_ONLY | |
73d88b80 LP |
1225 | DISSECT_IMAGE_USR_NO_ROOT | |
1226 | DISSECT_IMAGE_ADD_PARTITION_DEVICES | | |
1227 | DISSECT_IMAGE_PIN_PARTITION_DEVICES, | |
75dc190d | 1228 | &m); |
c7664c07 LP |
1229 | if (r < 0) |
1230 | return r; | |
1231 | ||
22847508 ZJS |
1232 | r = dissected_image_acquire_metadata(m, |
1233 | DISSECT_IMAGE_VALIDATE_OS | | |
1234 | DISSECT_IMAGE_VALIDATE_OS_EXT); | |
c7664c07 LP |
1235 | if (r < 0) |
1236 | return r; | |
1237 | ||
1238 | free_and_replace(i->hostname, m->hostname); | |
1239 | i->machine_id = m->machine_id; | |
1240 | strv_free_and_replace(i->machine_info, m->machine_info); | |
1241 | strv_free_and_replace(i->os_release, m->os_release); | |
bcf94222 | 1242 | strv_free_and_replace(i->extension_release, m->extension_release); |
c7664c07 LP |
1243 | |
1244 | break; | |
1245 | } | |
1246 | ||
1247 | default: | |
1248 | return -EOPNOTSUPP; | |
1249 | } | |
1250 | ||
1251 | i->metadata_valid = true; | |
1252 | ||
1253 | return 0; | |
1254 | } | |
1255 | ||
30535c16 | 1256 | int image_name_lock(const char *name, int operation, LockFile *ret) { |
99d97afc LP |
1257 | const char *p; |
1258 | ||
30535c16 LP |
1259 | assert(name); |
1260 | assert(ret); | |
1261 | ||
1262 | /* Locks an image name, regardless of the precise path used. */ | |
1263 | ||
99d97afc LP |
1264 | if (streq(name, ".host")) |
1265 | return -EBUSY; | |
1266 | ||
30535c16 LP |
1267 | if (!image_name_is_valid(name)) |
1268 | return -EINVAL; | |
1269 | ||
b6e953f2 LP |
1270 | if (getenv_bool("SYSTEMD_NSPAWN_LOCK") == 0) { |
1271 | *ret = (LockFile) LOCK_FILE_INIT; | |
1272 | return 0; | |
1273 | } | |
1274 | ||
6e5dcce4 | 1275 | (void) mkdir_p("/run/systemd/nspawn/locks", 0700); |
99d97afc LP |
1276 | |
1277 | p = strjoina("/run/systemd/nspawn/locks/name-", name); | |
30535c16 LP |
1278 | return make_lock_file(p, operation, ret); |
1279 | } | |
1280 | ||
d577d4a4 LP |
1281 | bool image_in_search_path( |
1282 | ImageClass class, | |
1283 | const char *root, | |
1284 | const char *image) { | |
1285 | ||
ace9ab19 LP |
1286 | assert(image); |
1287 | ||
1288 | NULSTR_FOREACH(path, image_search_path[class]) { | |
d577d4a4 | 1289 | const char *p, *q; |
ace9ab19 LP |
1290 | size_t k; |
1291 | ||
d577d4a4 LP |
1292 | if (!empty_or_root(root)) { |
1293 | q = path_startswith(path, root); | |
1294 | if (!q) | |
1295 | continue; | |
1296 | } else | |
1297 | q = path; | |
1298 | ||
1299 | p = path_startswith(q, path); | |
ace9ab19 LP |
1300 | if (!p) |
1301 | continue; | |
1302 | ||
1303 | /* Make sure there's a filename following */ | |
1304 | k = strcspn(p, "/"); | |
1305 | if (k == 0) | |
1306 | continue; | |
1307 | ||
1308 | p += k; | |
1309 | ||
1310 | /* Accept trailing slashes */ | |
1311 | if (p[strspn(p, "/")] == 0) | |
1312 | return true; | |
1313 | ||
1314 | } | |
1315 | ||
1316 | return false; | |
1317 | } | |
1318 | ||
cd61c3bf LP |
1319 | static const char* const image_type_table[_IMAGE_TYPE_MAX] = { |
1320 | [IMAGE_DIRECTORY] = "directory", | |
1321 | [IMAGE_SUBVOLUME] = "subvolume", | |
aceac2f0 | 1322 | [IMAGE_RAW] = "raw", |
eb38edce | 1323 | [IMAGE_BLOCK] = "block", |
cd61c3bf LP |
1324 | }; |
1325 | ||
1326 | DEFINE_STRING_TABLE_LOOKUP(image_type, ImageType); | |
e0cd1900 LP |
1327 | |
1328 | static const char* const image_class_table[_IMAGE_CLASS_MAX] = { | |
1329 | [IMAGE_MACHINE] = "machine", | |
1330 | [IMAGE_PORTABLE] = "portable", | |
1331 | [IMAGE_EXTENSION] = "extension", | |
1332 | }; | |
1333 | ||
1334 | DEFINE_STRING_TABLE_LOOKUP(image_class, ImageClass); |