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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" |
f4351959 | 17 | #include "chase-symlinks.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" |
a8fbdf54 TA |
30 | #include "lockfile-util.h" |
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 | ||
61 | [IMAGE_EXTENSION] = "/etc/extensions\0" /* only place symlinks here */ | |
62 | "/run/extensions\0" /* and here too */ | |
63 | "/var/lib/extensions\0" /* the main place for images */ | |
64 | "/usr/local/lib/extensions\0" | |
65 | "/usr/lib/extensions\0", | |
5ef46e5f | 66 | }; |
c2ce6a3d | 67 | |
8301aa0b YW |
68 | static Image *image_free(Image *i) { |
69 | assert(i); | |
9614bb06 | 70 | |
cd61c3bf LP |
71 | free(i->name); |
72 | free(i->path); | |
c7664c07 LP |
73 | |
74 | free(i->hostname); | |
75 | strv_free(i->machine_info); | |
76 | strv_free(i->os_release); | |
bcf94222 | 77 | strv_free(i->extension_release); |
c7664c07 | 78 | |
6b430fdb | 79 | return mfree(i); |
cd61c3bf LP |
80 | } |
81 | ||
8301aa0b | 82 | DEFINE_TRIVIAL_REF_UNREF_FUNC(Image, image, image_free); |
b07ec5a1 YW |
83 | DEFINE_HASH_OPS_WITH_VALUE_DESTRUCTOR(image_hash_ops, char, string_hash_func, string_compare_func, |
84 | Image, image_unref); | |
9614bb06 | 85 | |
8e0b6570 LP |
86 | static char **image_settings_path(Image *image) { |
87 | _cleanup_strv_free_ char **l = NULL; | |
5980d463 | 88 | const char *fn; |
8e0b6570 LP |
89 | unsigned i = 0; |
90 | ||
91 | assert(image); | |
92 | ||
93 | l = new0(char*, 4); | |
94 | if (!l) | |
95 | return NULL; | |
96 | ||
97 | fn = strjoina(image->name, ".nspawn"); | |
98 | ||
b910cc72 LP |
99 | FOREACH_STRING(s, "/etc/systemd/nspawn", "/run/systemd/nspawn") { |
100 | l[i] = path_join(s, fn); | |
8e0b6570 LP |
101 | if (!l[i]) |
102 | return NULL; | |
103 | ||
104 | i++; | |
105 | } | |
106 | ||
107 | l[i] = file_in_same_dir(image->path, fn); | |
108 | if (!l[i]) | |
109 | return NULL; | |
110 | ||
ae2a15bc | 111 | return TAKE_PTR(l); |
8e0b6570 LP |
112 | } |
113 | ||
bafbac4e LP |
114 | static char *image_roothash_path(Image *image) { |
115 | const char *fn; | |
116 | ||
117 | assert(image); | |
118 | ||
119 | fn = strjoina(image->name, ".roothash"); | |
120 | ||
121 | return file_in_same_dir(image->path, fn); | |
122 | } | |
123 | ||
c2ce6a3d | 124 | static int image_new( |
cd61c3bf | 125 | ImageType t, |
3775e141 | 126 | ImageClass c, |
5fc7f358 | 127 | const char *pretty, |
cd61c3bf | 128 | const char *path, |
5fc7f358 | 129 | const char *filename, |
cd61c3bf | 130 | bool read_only, |
10f9c755 | 131 | usec_t crtime, |
cd61c3bf | 132 | usec_t mtime, |
c2ce6a3d | 133 | Image **ret) { |
cd61c3bf LP |
134 | |
135 | _cleanup_(image_unrefp) Image *i = NULL; | |
cd61c3bf | 136 | |
cd61c3bf LP |
137 | assert(t >= 0); |
138 | assert(t < _IMAGE_TYPE_MAX); | |
5fc7f358 LP |
139 | assert(pretty); |
140 | assert(filename); | |
c2ce6a3d | 141 | assert(ret); |
cd61c3bf | 142 | |
c2108701 | 143 | i = new(Image, 1); |
cd61c3bf LP |
144 | if (!i) |
145 | return -ENOMEM; | |
146 | ||
c2108701 LP |
147 | *i = (Image) { |
148 | .n_ref = 1, | |
149 | .type = t, | |
3775e141 | 150 | .class = c, |
c2108701 LP |
151 | .read_only = read_only, |
152 | .crtime = crtime, | |
153 | .mtime = mtime, | |
154 | .usage = UINT64_MAX, | |
155 | .usage_exclusive = UINT64_MAX, | |
156 | .limit = UINT64_MAX, | |
157 | .limit_exclusive = UINT64_MAX, | |
158 | }; | |
cd61c3bf | 159 | |
5fc7f358 | 160 | i->name = strdup(pretty); |
cd61c3bf LP |
161 | if (!i->name) |
162 | return -ENOMEM; | |
163 | ||
657ee2d8 | 164 | i->path = path_join(path, filename); |
5fc7f358 LP |
165 | if (!i->path) |
166 | return -ENOMEM; | |
167 | ||
4ff361cc | 168 | path_simplify(i->path); |
cd61c3bf | 169 | |
1cc6c93a | 170 | *ret = TAKE_PTR(i); |
c2ce6a3d | 171 | |
cd61c3bf LP |
172 | return 0; |
173 | } | |
174 | ||
4756c94e LP |
175 | static int extract_pretty(const char *path, const char *suffix, char **ret) { |
176 | _cleanup_free_ char *name = NULL; | |
177 | const char *p; | |
4756c94e LP |
178 | |
179 | assert(path); | |
180 | assert(ret); | |
181 | ||
182 | p = last_path_component(path); | |
4756c94e | 183 | |
e8bec624 | 184 | name = strdupcspn(p, "/"); |
4756c94e LP |
185 | if (!name) |
186 | return -ENOMEM; | |
187 | ||
188 | if (suffix) { | |
189 | char *e; | |
190 | ||
191 | e = endswith(name, suffix); | |
192 | if (!e) | |
193 | return -EINVAL; | |
194 | ||
195 | *e = 0; | |
196 | } | |
197 | ||
198 | if (!image_name_is_valid(name)) | |
199 | return -EINVAL; | |
200 | ||
201 | *ret = TAKE_PTR(name); | |
202 | return 0; | |
203 | } | |
204 | ||
5fc7f358 | 205 | static int image_make( |
3775e141 | 206 | ImageClass c, |
5fc7f358 LP |
207 | const char *pretty, |
208 | int dfd, | |
209 | const char *path, | |
210 | const char *filename, | |
3a6ce860 | 211 | const struct stat *st, |
5fc7f358 LP |
212 | Image **ret) { |
213 | ||
2570578d | 214 | _cleanup_free_ char *pretty_buffer = NULL, *parent = NULL; |
3a6ce860 | 215 | struct stat stbuf; |
5fc7f358 | 216 | bool read_only; |
cd61c3bf LP |
217 | int r; |
218 | ||
3a6ce860 | 219 | assert(dfd >= 0 || dfd == AT_FDCWD); |
bcb846f3 | 220 | assert(path || dfd == AT_FDCWD); |
5fc7f358 | 221 | assert(filename); |
cd61c3bf | 222 | |
eb38edce | 223 | /* We explicitly *do* follow symlinks here, since we want to allow symlinking trees, raw files and block |
3a6ce860 LP |
224 | * devices into /var/lib/machines/, and treat them normally. |
225 | * | |
226 | * This function returns -ENOENT if we can't find the image after all, and -EMEDIUMTYPE if it's not a file we | |
227 | * recognize. */ | |
cd61c3bf | 228 | |
3a6ce860 LP |
229 | if (!st) { |
230 | if (fstatat(dfd, filename, &stbuf, 0) < 0) | |
231 | return -errno; | |
232 | ||
233 | st = &stbuf; | |
234 | } | |
cd61c3bf | 235 | |
2570578d LP |
236 | if (!path) { |
237 | if (dfd == AT_FDCWD) | |
238 | (void) safe_getcwd(&parent); | |
239 | else | |
240 | (void) fd_get_path(dfd, &parent); | |
241 | } | |
bcb846f3 | 242 | |
5fc7f358 LP |
243 | read_only = |
244 | (path && path_startswith(path, "/usr")) || | |
08ff5529 | 245 | (faccessat(dfd, filename, W_OK, AT_EACCESS) < 0 && errno == EROFS); |
86e339c8 | 246 | |
3a6ce860 | 247 | if (S_ISDIR(st->st_mode)) { |
254d1313 | 248 | _cleanup_close_ int fd = -EBADF; |
01b72568 | 249 | unsigned file_attr = 0; |
02dcf215 | 250 | usec_t crtime = 0; |
cd61c3bf | 251 | |
c2ce6a3d | 252 | if (!ret) |
3a6ce860 | 253 | return 0; |
cd61c3bf | 254 | |
4756c94e LP |
255 | if (!pretty) { |
256 | r = extract_pretty(filename, NULL, &pretty_buffer); | |
257 | if (r < 0) | |
258 | return r; | |
259 | ||
260 | pretty = pretty_buffer; | |
261 | } | |
5fc7f358 | 262 | |
01b72568 LP |
263 | fd = openat(dfd, filename, O_CLOEXEC|O_NOCTTY|O_DIRECTORY); |
264 | if (fd < 0) | |
265 | return -errno; | |
266 | ||
674b04ff | 267 | if (btrfs_might_be_subvol(st)) { |
cd61c3bf | 268 | |
65ddc2c5 | 269 | r = fd_is_fs_type(fd, BTRFS_SUPER_MAGIC); |
21222ea5 LP |
270 | if (r < 0) |
271 | return r; | |
272 | if (r) { | |
10f9c755 | 273 | BtrfsSubvolInfo info; |
cd61c3bf | 274 | |
c2ce6a3d | 275 | /* It's a btrfs subvolume */ |
cd61c3bf | 276 | |
5bcd08db | 277 | r = btrfs_subvol_get_info_fd(fd, 0, &info); |
10f9c755 LP |
278 | if (r < 0) |
279 | return r; | |
c2ce6a3d LP |
280 | |
281 | r = image_new(IMAGE_SUBVOLUME, | |
3775e141 | 282 | c, |
5fc7f358 | 283 | pretty, |
c2ce6a3d | 284 | path, |
5fc7f358 LP |
285 | filename, |
286 | info.read_only || read_only, | |
10f9c755 | 287 | info.otime, |
c2ce6a3d | 288 | 0, |
c2ce6a3d LP |
289 | ret); |
290 | if (r < 0) | |
291 | return r; | |
292 | ||
5bcd08db LP |
293 | if (btrfs_quota_scan_ongoing(fd) == 0) { |
294 | BtrfsQuotaInfo quota; | |
b6b18498 | 295 | |
5bcd08db LP |
296 | r = btrfs_subvol_get_subtree_quota_fd(fd, 0, "a); |
297 | if (r >= 0) { | |
298 | (*ret)->usage = quota.referenced; | |
299 | (*ret)->usage_exclusive = quota.exclusive; | |
300 | ||
301 | (*ret)->limit = quota.referenced_max; | |
302 | (*ret)->limit_exclusive = quota.exclusive_max; | |
303 | } | |
b6b18498 LP |
304 | } |
305 | ||
3a6ce860 | 306 | return 0; |
cd61c3bf | 307 | } |
c2ce6a3d | 308 | } |
cd61c3bf | 309 | |
02dcf215 | 310 | /* Get directory creation time (not available everywhere, but that's OK */ |
12a7f04a | 311 | (void) fd_getcrtime(fd, &crtime); |
02dcf215 LP |
312 | |
313 | /* If the IMMUTABLE bit is set, we consider the directory read-only. Since the ioctl is not | |
01b72568 LP |
314 | * supported everywhere we ignore failures. */ |
315 | (void) read_attr_fd(fd, &file_attr); | |
cd61c3bf | 316 | |
01b72568 | 317 | /* It's just a normal directory. */ |
c2ce6a3d | 318 | r = image_new(IMAGE_DIRECTORY, |
3775e141 | 319 | c, |
5fc7f358 | 320 | pretty, |
c2ce6a3d | 321 | path, |
5fc7f358 | 322 | filename, |
01b72568 | 323 | read_only || (file_attr & FS_IMMUTABLE_FL), |
02dcf215 LP |
324 | crtime, |
325 | 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 |
326 | ret); |
327 | if (r < 0) | |
328 | return r; | |
cd61c3bf | 329 | |
3a6ce860 | 330 | return 0; |
cd61c3bf | 331 | |
3a6ce860 | 332 | } else if (S_ISREG(st->st_mode) && endswith(filename, ".raw")) { |
10f9c755 | 333 | usec_t crtime = 0; |
cd61c3bf | 334 | |
aceac2f0 | 335 | /* It's a RAW disk image */ |
cd61c3bf | 336 | |
c2ce6a3d | 337 | if (!ret) |
3a6ce860 | 338 | return 0; |
cd61c3bf | 339 | |
c53e07e2 | 340 | (void) fd_getcrtime_at(dfd, filename, AT_SYMLINK_FOLLOW, &crtime); |
10f9c755 | 341 | |
4756c94e LP |
342 | if (!pretty) { |
343 | r = extract_pretty(filename, ".raw", &pretty_buffer); | |
344 | if (r < 0) | |
345 | return r; | |
346 | ||
347 | pretty = pretty_buffer; | |
348 | } | |
10f9c755 | 349 | |
aceac2f0 | 350 | r = image_new(IMAGE_RAW, |
3775e141 | 351 | c, |
5fc7f358 | 352 | pretty, |
c2ce6a3d | 353 | path, |
5fc7f358 | 354 | filename, |
3a6ce860 | 355 | !(st->st_mode & 0222) || read_only, |
10f9c755 | 356 | crtime, |
3a6ce860 | 357 | timespec_load(&st->st_mtim), |
c2ce6a3d LP |
358 | ret); |
359 | if (r < 0) | |
360 | return r; | |
cd61c3bf | 361 | |
3a6ce860 LP |
362 | (*ret)->usage = (*ret)->usage_exclusive = st->st_blocks * 512; |
363 | (*ret)->limit = (*ret)->limit_exclusive = st->st_size; | |
b6b18498 | 364 | |
3a6ce860 | 365 | return 0; |
eb38edce | 366 | |
3a6ce860 | 367 | } else if (S_ISBLK(st->st_mode)) { |
254d1313 | 368 | _cleanup_close_ int block_fd = -EBADF; |
eb38edce LP |
369 | uint64_t size = UINT64_MAX; |
370 | ||
371 | /* A block device */ | |
372 | ||
373 | if (!ret) | |
3a6ce860 | 374 | return 0; |
eb38edce | 375 | |
4756c94e LP |
376 | if (!pretty) { |
377 | r = extract_pretty(filename, NULL, &pretty_buffer); | |
378 | if (r < 0) | |
379 | return r; | |
380 | ||
381 | pretty = pretty_buffer; | |
382 | } | |
eb38edce LP |
383 | |
384 | block_fd = openat(dfd, filename, O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_NOCTTY); | |
385 | if (block_fd < 0) | |
2570578d | 386 | log_debug_errno(errno, "Failed to open block device %s/%s, ignoring: %m", path ?: strnull(parent), filename); |
eb38edce | 387 | else { |
3a6ce860 LP |
388 | /* Refresh stat data after opening the node */ |
389 | if (fstat(block_fd, &stbuf) < 0) | |
eb38edce | 390 | return -errno; |
3a6ce860 LP |
391 | st = &stbuf; |
392 | ||
393 | if (!S_ISBLK(st->st_mode)) /* Verify that what we opened is actually what we think it is */ | |
eb38edce LP |
394 | return -ENOTTY; |
395 | ||
396 | if (!read_only) { | |
397 | int state = 0; | |
398 | ||
399 | if (ioctl(block_fd, BLKROGET, &state) < 0) | |
2570578d | 400 | log_debug_errno(errno, "Failed to issue BLKROGET on device %s/%s, ignoring: %m", path ?: strnull(parent), filename); |
eb38edce LP |
401 | else if (state) |
402 | read_only = true; | |
403 | } | |
404 | ||
405 | if (ioctl(block_fd, BLKGETSIZE64, &size) < 0) | |
2570578d | 406 | log_debug_errno(errno, "Failed to issue BLKGETSIZE64 on device %s/%s, ignoring: %m", path ?: strnull(parent), filename); |
eb38edce LP |
407 | |
408 | block_fd = safe_close(block_fd); | |
409 | } | |
410 | ||
411 | r = image_new(IMAGE_BLOCK, | |
3775e141 | 412 | c, |
eb38edce LP |
413 | pretty, |
414 | path, | |
415 | filename, | |
3a6ce860 | 416 | !(st->st_mode & 0222) || read_only, |
eb38edce LP |
417 | 0, |
418 | 0, | |
419 | ret); | |
420 | if (r < 0) | |
421 | return r; | |
422 | ||
ed0cb346 | 423 | if (!IN_SET(size, 0, UINT64_MAX)) |
eb38edce LP |
424 | (*ret)->usage = (*ret)->usage_exclusive = (*ret)->limit = (*ret)->limit_exclusive = size; |
425 | ||
3a6ce860 | 426 | return 0; |
c2ce6a3d | 427 | } |
cd61c3bf | 428 | |
3a6ce860 | 429 | return -EMEDIUMTYPE; |
c2ce6a3d | 430 | } |
cd61c3bf | 431 | |
d577d4a4 LP |
432 | int image_find(ImageClass class, |
433 | const char *name, | |
434 | const char *root, | |
435 | Image **ret) { | |
436 | ||
c2ce6a3d | 437 | int r; |
cd61c3bf | 438 | |
5ef46e5f LP |
439 | assert(class >= 0); |
440 | assert(class < _IMAGE_CLASS_MAX); | |
c2ce6a3d | 441 | assert(name); |
cd61c3bf | 442 | |
c2ce6a3d LP |
443 | /* There are no images with invalid names */ |
444 | if (!image_name_is_valid(name)) | |
3a6ce860 | 445 | return -ENOENT; |
cd61c3bf | 446 | |
5ef46e5f | 447 | NULSTR_FOREACH(path, image_search_path[class]) { |
d577d4a4 | 448 | _cleanup_free_ char *resolved = NULL; |
c2ce6a3d | 449 | _cleanup_closedir_ DIR *d = NULL; |
3a6ce860 | 450 | struct stat st; |
d577d4a4 | 451 | int flags; |
cd61c3bf | 452 | |
d577d4a4 LP |
453 | r = chase_symlinks_and_opendir(path, root, CHASE_PREFIX_ROOT, &resolved, &d); |
454 | if (r == -ENOENT) | |
455 | continue; | |
456 | if (r < 0) | |
457 | return r; | |
cd61c3bf | 458 | |
d577d4a4 LP |
459 | /* As mentioned above, we follow symlinks on this fstatat(), because we want to permit people |
460 | * to symlink block devices into the search path. (For now, we disable that when operating | |
461 | * relative to some root directory.) */ | |
462 | flags = root ? AT_SYMLINK_NOFOLLOW : 0; | |
463 | if (fstatat(dirfd(d), name, &st, flags) < 0) { | |
aceac2f0 | 464 | _cleanup_free_ char *raw = NULL; |
5fc7f358 | 465 | |
3a6ce860 LP |
466 | if (errno != ENOENT) |
467 | return -errno; | |
468 | ||
b910cc72 | 469 | raw = strjoin(name, ".raw"); |
aceac2f0 | 470 | if (!raw) |
5fc7f358 LP |
471 | return -ENOMEM; |
472 | ||
d577d4a4 | 473 | if (fstatat(dirfd(d), raw, &st, flags) < 0) { |
3a6ce860 LP |
474 | if (errno == ENOENT) |
475 | continue; | |
476 | ||
477 | return -errno; | |
478 | } | |
479 | ||
480 | if (!S_ISREG(st.st_mode)) | |
5fc7f358 | 481 | continue; |
3a6ce860 | 482 | |
3775e141 | 483 | r = image_make(class, name, dirfd(d), resolved, raw, &st, ret); |
3a6ce860 LP |
484 | |
485 | } else { | |
486 | if (!S_ISDIR(st.st_mode) && !S_ISBLK(st.st_mode)) | |
487 | continue; | |
488 | ||
3775e141 | 489 | r = image_make(class, name, dirfd(d), resolved, name, &st, ret); |
5fc7f358 | 490 | } |
3a6ce860 LP |
491 | if (IN_SET(r, -ENOENT, -EMEDIUMTYPE)) |
492 | continue; | |
c2ce6a3d LP |
493 | if (r < 0) |
494 | return r; | |
cd61c3bf | 495 | |
cf604fd4 LP |
496 | if (ret) |
497 | (*ret)->discoverable = true; | |
498 | ||
c2ce6a3d LP |
499 | return 1; |
500 | } | |
501 | ||
cf604fd4 | 502 | if (class == IMAGE_MACHINE && streq(name, ".host")) { |
3775e141 | 503 | r = image_make(class, ".host", AT_FDCWD, NULL, empty_to_root(root), NULL, ret); |
cf604fd4 LP |
504 | if (r < 0) |
505 | return r; | |
506 | ||
507 | if (ret) | |
508 | (*ret)->discoverable = true; | |
509 | ||
510 | return r; | |
511 | } | |
5fc7f358 | 512 | |
3a6ce860 | 513 | return -ENOENT; |
c2ce6a3d LP |
514 | }; |
515 | ||
2ddf182b | 516 | int image_from_path(const char *path, Image **ret) { |
cf604fd4 LP |
517 | |
518 | /* Note that we don't set the 'discoverable' field of the returned object, because we don't check here whether | |
519 | * 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 | 520 | * overridden by another, different image earlier in the search path */ |
cf604fd4 | 521 | |
2ddf182b | 522 | if (path_equal(path, "/")) |
3775e141 | 523 | return image_make(IMAGE_MACHINE, ".host", AT_FDCWD, NULL, "/", NULL, ret); |
2ddf182b | 524 | |
3775e141 | 525 | return image_make(_IMAGE_CLASS_INVALID, NULL, AT_FDCWD, NULL, path, NULL, ret); |
2ddf182b LP |
526 | } |
527 | ||
d577d4a4 | 528 | int image_find_harder(ImageClass class, const char *name_or_path, const char *root, Image **ret) { |
2ddf182b | 529 | if (image_name_is_valid(name_or_path)) |
d577d4a4 | 530 | return image_find(class, name_or_path, root, ret); |
2ddf182b LP |
531 | |
532 | return image_from_path(name_or_path, ret); | |
533 | } | |
534 | ||
d577d4a4 LP |
535 | int image_discover( |
536 | ImageClass class, | |
537 | const char *root, | |
538 | Hashmap *h) { | |
539 | ||
c2ce6a3d LP |
540 | int r; |
541 | ||
5ef46e5f LP |
542 | assert(class >= 0); |
543 | assert(class < _IMAGE_CLASS_MAX); | |
c2ce6a3d LP |
544 | assert(h); |
545 | ||
5ef46e5f | 546 | NULSTR_FOREACH(path, image_search_path[class]) { |
d577d4a4 | 547 | _cleanup_free_ char *resolved = NULL; |
c2ce6a3d | 548 | _cleanup_closedir_ DIR *d = NULL; |
c2ce6a3d | 549 | |
d577d4a4 LP |
550 | r = chase_symlinks_and_opendir(path, root, CHASE_PREFIX_ROOT, &resolved, &d); |
551 | if (r == -ENOENT) | |
552 | continue; | |
553 | if (r < 0) | |
554 | return r; | |
c2ce6a3d LP |
555 | |
556 | FOREACH_DIRENT_ALL(de, d, return -errno) { | |
557 | _cleanup_(image_unrefp) Image *image = NULL; | |
1bf36bf9 | 558 | _cleanup_free_ char *truncated = NULL; |
3a6ce860 LP |
559 | const char *pretty; |
560 | struct stat st; | |
d577d4a4 | 561 | int flags; |
c2ce6a3d | 562 | |
1bf36bf9 | 563 | if (dot_or_dot_dot(de->d_name)) |
c2ce6a3d LP |
564 | continue; |
565 | ||
d577d4a4 LP |
566 | /* As mentioned above, we follow symlinks on this fstatat(), because we want to |
567 | * permit people to symlink block devices into the search path. */ | |
568 | flags = root ? AT_SYMLINK_NOFOLLOW : 0; | |
569 | if (fstatat(dirfd(d), de->d_name, &st, flags) < 0) { | |
3a6ce860 LP |
570 | if (errno == ENOENT) |
571 | continue; | |
572 | ||
573 | return -errno; | |
574 | } | |
575 | ||
576 | if (S_ISREG(st.st_mode)) { | |
577 | const char *e; | |
578 | ||
579 | e = endswith(de->d_name, ".raw"); | |
580 | if (!e) | |
581 | continue; | |
582 | ||
1bf36bf9 LP |
583 | truncated = strndup(de->d_name, e - de->d_name); |
584 | if (!truncated) | |
585 | return -ENOMEM; | |
586 | ||
587 | pretty = truncated; | |
3a6ce860 | 588 | } else if (S_ISDIR(st.st_mode) || S_ISBLK(st.st_mode)) |
1bf36bf9 | 589 | pretty = de->d_name; |
3a6ce860 LP |
590 | else |
591 | continue; | |
1bf36bf9 LP |
592 | |
593 | if (!image_name_is_valid(pretty)) | |
594 | continue; | |
595 | ||
596 | if (hashmap_contains(h, pretty)) | |
c2ce6a3d LP |
597 | continue; |
598 | ||
3775e141 | 599 | r = image_make(class, pretty, dirfd(d), resolved, de->d_name, &st, &image); |
3a6ce860 | 600 | if (IN_SET(r, -ENOENT, -EMEDIUMTYPE)) |
c2ce6a3d LP |
601 | continue; |
602 | if (r < 0) | |
603 | return r; | |
604 | ||
cf604fd4 LP |
605 | image->discoverable = true; |
606 | ||
c2ce6a3d LP |
607 | r = hashmap_put(h, image->name, image); |
608 | if (r < 0) | |
609 | return r; | |
610 | ||
611 | image = NULL; | |
cd61c3bf LP |
612 | } |
613 | } | |
614 | ||
5ef46e5f | 615 | if (class == IMAGE_MACHINE && !hashmap_contains(h, ".host")) { |
5fc7f358 LP |
616 | _cleanup_(image_unrefp) Image *image = NULL; |
617 | ||
3775e141 | 618 | r = image_make(IMAGE_MACHINE, ".host", AT_FDCWD, NULL, empty_to_root("/"), NULL, &image); |
5fc7f358 LP |
619 | if (r < 0) |
620 | return r; | |
621 | ||
cf604fd4 LP |
622 | image->discoverable = true; |
623 | ||
5fc7f358 LP |
624 | r = hashmap_put(h, image->name, image); |
625 | if (r < 0) | |
626 | return r; | |
627 | ||
628 | image = NULL; | |
5fc7f358 LP |
629 | } |
630 | ||
cd61c3bf LP |
631 | return 0; |
632 | } | |
633 | ||
08682124 | 634 | int image_remove(Image *i) { |
8e766630 | 635 | _cleanup_(release_lock_file) LockFile global_lock = LOCK_FILE_INIT, local_lock = LOCK_FILE_INIT; |
8e0b6570 | 636 | _cleanup_strv_free_ char **settings = NULL; |
bafbac4e | 637 | _cleanup_free_ char *roothash = NULL; |
30535c16 LP |
638 | int r; |
639 | ||
08682124 LP |
640 | assert(i); |
641 | ||
d94c2b06 | 642 | if (IMAGE_IS_VENDOR(i) || IMAGE_IS_HOST(i)) |
08682124 LP |
643 | return -EROFS; |
644 | ||
8e0b6570 LP |
645 | settings = image_settings_path(i); |
646 | if (!settings) | |
647 | return -ENOMEM; | |
648 | ||
bafbac4e LP |
649 | roothash = image_roothash_path(i); |
650 | if (!roothash) | |
651 | return -ENOMEM; | |
652 | ||
30535c16 LP |
653 | /* Make sure we don't interfere with a running nspawn */ |
654 | r = image_path_lock(i->path, LOCK_EX|LOCK_NB, &global_lock, &local_lock); | |
655 | if (r < 0) | |
656 | return r; | |
657 | ||
ebd93cb6 LP |
658 | switch (i->type) { |
659 | ||
660 | case IMAGE_SUBVOLUME: | |
9fb0b9c7 LP |
661 | |
662 | /* Let's unlink first, maybe it is a symlink? If that works we are happy. Otherwise, let's get out the | |
663 | * big guns */ | |
664 | if (unlink(i->path) < 0) { | |
665 | r = btrfs_subvol_remove(i->path, BTRFS_REMOVE_RECURSIVE|BTRFS_REMOVE_QUOTA); | |
666 | if (r < 0) | |
667 | return r; | |
668 | } | |
669 | ||
8e0b6570 | 670 | break; |
ebd93cb6 LP |
671 | |
672 | case IMAGE_DIRECTORY: | |
01b72568 | 673 | /* Allow deletion of read-only directories */ |
db9a4254 | 674 | (void) chattr_path(i->path, 0, FS_IMMUTABLE_FL, NULL); |
8e0b6570 LP |
675 | r = rm_rf(i->path, REMOVE_ROOT|REMOVE_PHYSICAL|REMOVE_SUBVOLUME); |
676 | if (r < 0) | |
677 | return r; | |
678 | ||
679 | break; | |
01b72568 | 680 | |
eb38edce LP |
681 | case IMAGE_BLOCK: |
682 | ||
683 | /* If this is inside of /dev, then it's a real block device, hence let's not touch the device node | |
684 | * itself (but let's remove the stuff stored alongside it). If it's anywhere else, let's try to unlink | |
685 | * the thing (it's most likely a symlink after all). */ | |
686 | ||
687 | if (path_startswith(i->path, "/dev")) | |
688 | break; | |
689 | ||
4831981d | 690 | _fallthrough_; |
aceac2f0 | 691 | case IMAGE_RAW: |
41d1ed05 LP |
692 | if (unlink(i->path) < 0) |
693 | return -errno; | |
8e0b6570 | 694 | break; |
ebd93cb6 LP |
695 | |
696 | default: | |
15411c0c | 697 | return -EOPNOTSUPP; |
ebd93cb6 | 698 | } |
8e0b6570 | 699 | |
de010b0b | 700 | STRV_FOREACH(j, settings) |
8e0b6570 LP |
701 | if (unlink(*j) < 0 && errno != ENOENT) |
702 | log_debug_errno(errno, "Failed to unlink %s, ignoring: %m", *j); | |
8e0b6570 | 703 | |
bafbac4e LP |
704 | if (unlink(roothash) < 0 && errno != ENOENT) |
705 | log_debug_errno(errno, "Failed to unlink %s, ignoring: %m", roothash); | |
706 | ||
8e0b6570 LP |
707 | return 0; |
708 | } | |
709 | ||
bafbac4e | 710 | static int rename_auxiliary_file(const char *path, const char *new_name, const char *suffix) { |
8e0b6570 LP |
711 | _cleanup_free_ char *rs = NULL; |
712 | const char *fn; | |
713 | ||
bafbac4e | 714 | fn = strjoina(new_name, suffix); |
8e0b6570 LP |
715 | |
716 | rs = file_in_same_dir(path, fn); | |
717 | if (!rs) | |
718 | return -ENOMEM; | |
719 | ||
720 | return rename_noreplace(AT_FDCWD, path, AT_FDCWD, rs); | |
ebd93cb6 LP |
721 | } |
722 | ||
723 | int image_rename(Image *i, const char *new_name) { | |
8e766630 | 724 | _cleanup_(release_lock_file) LockFile global_lock = LOCK_FILE_INIT, local_lock = LOCK_FILE_INIT, name_lock = LOCK_FILE_INIT; |
bafbac4e | 725 | _cleanup_free_ char *new_path = NULL, *nn = NULL, *roothash = NULL; |
8e0b6570 | 726 | _cleanup_strv_free_ char **settings = NULL; |
01b72568 | 727 | unsigned file_attr = 0; |
ebd93cb6 LP |
728 | int r; |
729 | ||
730 | assert(i); | |
731 | ||
732 | if (!image_name_is_valid(new_name)) | |
733 | return -EINVAL; | |
734 | ||
d94c2b06 | 735 | if (IMAGE_IS_VENDOR(i) || IMAGE_IS_HOST(i)) |
ebd93cb6 LP |
736 | return -EROFS; |
737 | ||
8e0b6570 LP |
738 | settings = image_settings_path(i); |
739 | if (!settings) | |
740 | return -ENOMEM; | |
741 | ||
bafbac4e LP |
742 | roothash = image_roothash_path(i); |
743 | if (!roothash) | |
744 | return -ENOMEM; | |
745 | ||
30535c16 LP |
746 | /* Make sure we don't interfere with a running nspawn */ |
747 | r = image_path_lock(i->path, LOCK_EX|LOCK_NB, &global_lock, &local_lock); | |
748 | if (r < 0) | |
749 | return r; | |
750 | ||
751 | /* Make sure nobody takes the new name, between the time we | |
752 | * checked it is currently unused in all search paths, and the | |
f8e2f4d6 | 753 | * time we take possession of it */ |
30535c16 LP |
754 | r = image_name_lock(new_name, LOCK_EX|LOCK_NB, &name_lock); |
755 | if (r < 0) | |
756 | return r; | |
757 | ||
d577d4a4 | 758 | r = image_find(IMAGE_MACHINE, new_name, NULL, NULL); |
3a6ce860 | 759 | if (r >= 0) |
ebd93cb6 | 760 | return -EEXIST; |
3a6ce860 LP |
761 | if (r != -ENOENT) |
762 | return r; | |
ebd93cb6 LP |
763 | |
764 | switch (i->type) { | |
765 | ||
ebd93cb6 | 766 | case IMAGE_DIRECTORY: |
01b72568 LP |
767 | /* Turn of the immutable bit while we rename the image, so that we can rename it */ |
768 | (void) read_attr_path(i->path, &file_attr); | |
769 | ||
770 | if (file_attr & FS_IMMUTABLE_FL) | |
db9a4254 | 771 | (void) chattr_path(i->path, 0, FS_IMMUTABLE_FL, NULL); |
01b72568 | 772 | |
4831981d | 773 | _fallthrough_; |
01b72568 | 774 | case IMAGE_SUBVOLUME: |
ebd93cb6 LP |
775 | new_path = file_in_same_dir(i->path, new_name); |
776 | break; | |
777 | ||
eb38edce LP |
778 | case IMAGE_BLOCK: |
779 | ||
780 | /* Refuse renaming raw block devices in /dev, the names are picked by udev after all. */ | |
781 | if (path_startswith(i->path, "/dev")) | |
782 | return -EROFS; | |
783 | ||
784 | new_path = file_in_same_dir(i->path, new_name); | |
785 | break; | |
786 | ||
aceac2f0 | 787 | case IMAGE_RAW: { |
ebd93cb6 LP |
788 | const char *fn; |
789 | ||
63c372cb | 790 | fn = strjoina(new_name, ".raw"); |
ebd93cb6 LP |
791 | new_path = file_in_same_dir(i->path, fn); |
792 | break; | |
793 | } | |
794 | ||
795 | default: | |
15411c0c | 796 | return -EOPNOTSUPP; |
ebd93cb6 LP |
797 | } |
798 | ||
799 | if (!new_path) | |
800 | return -ENOMEM; | |
801 | ||
802 | nn = strdup(new_name); | |
803 | if (!nn) | |
804 | return -ENOMEM; | |
805 | ||
f85ef957 AC |
806 | r = rename_noreplace(AT_FDCWD, i->path, AT_FDCWD, new_path); |
807 | if (r < 0) | |
808 | return r; | |
ebd93cb6 | 809 | |
01b72568 LP |
810 | /* Restore the immutable bit, if it was set before */ |
811 | if (file_attr & FS_IMMUTABLE_FL) | |
db9a4254 | 812 | (void) chattr_path(new_path, FS_IMMUTABLE_FL, FS_IMMUTABLE_FL, NULL); |
01b72568 | 813 | |
f9ecfd3b DL |
814 | free_and_replace(i->path, new_path); |
815 | free_and_replace(i->name, nn); | |
ebd93cb6 | 816 | |
8e0b6570 | 817 | STRV_FOREACH(j, settings) { |
bafbac4e | 818 | r = rename_auxiliary_file(*j, new_name, ".nspawn"); |
8e0b6570 LP |
819 | if (r < 0 && r != -ENOENT) |
820 | log_debug_errno(r, "Failed to rename settings file %s, ignoring: %m", *j); | |
821 | } | |
822 | ||
bafbac4e LP |
823 | r = rename_auxiliary_file(roothash, new_name, ".roothash"); |
824 | if (r < 0 && r != -ENOENT) | |
825 | log_debug_errno(r, "Failed to rename roothash file %s, ignoring: %m", roothash); | |
826 | ||
ebd93cb6 LP |
827 | return 0; |
828 | } | |
829 | ||
bafbac4e | 830 | static int clone_auxiliary_file(const char *path, const char *new_name, const char *suffix) { |
8e0b6570 LP |
831 | _cleanup_free_ char *rs = NULL; |
832 | const char *fn; | |
833 | ||
bafbac4e | 834 | fn = strjoina(new_name, suffix); |
8e0b6570 LP |
835 | |
836 | rs = file_in_same_dir(path, fn); | |
837 | if (!rs) | |
838 | return -ENOMEM; | |
839 | ||
8a016c74 | 840 | return copy_file_atomic(path, rs, 0664, 0, 0, COPY_REFLINK); |
8e0b6570 LP |
841 | } |
842 | ||
ebd93cb6 | 843 | int image_clone(Image *i, const char *new_name, bool read_only) { |
8e766630 | 844 | _cleanup_(release_lock_file) LockFile name_lock = LOCK_FILE_INIT; |
8e0b6570 | 845 | _cleanup_strv_free_ char **settings = NULL; |
bafbac4e | 846 | _cleanup_free_ char *roothash = NULL; |
ebd93cb6 LP |
847 | const char *new_path; |
848 | int r; | |
849 | ||
850 | assert(i); | |
851 | ||
852 | if (!image_name_is_valid(new_name)) | |
853 | return -EINVAL; | |
854 | ||
8e0b6570 LP |
855 | settings = image_settings_path(i); |
856 | if (!settings) | |
857 | return -ENOMEM; | |
858 | ||
bafbac4e LP |
859 | roothash = image_roothash_path(i); |
860 | if (!roothash) | |
861 | return -ENOMEM; | |
862 | ||
30535c16 LP |
863 | /* Make sure nobody takes the new name, between the time we |
864 | * checked it is currently unused in all search paths, and the | |
f8e2f4d6 | 865 | * time we take possession of it */ |
30535c16 LP |
866 | r = image_name_lock(new_name, LOCK_EX|LOCK_NB, &name_lock); |
867 | if (r < 0) | |
868 | return r; | |
869 | ||
d577d4a4 | 870 | r = image_find(IMAGE_MACHINE, new_name, NULL, NULL); |
3a6ce860 | 871 | if (r >= 0) |
ebd93cb6 | 872 | return -EEXIST; |
3a6ce860 LP |
873 | if (r != -ENOENT) |
874 | return r; | |
ebd93cb6 LP |
875 | |
876 | switch (i->type) { | |
877 | ||
878 | case IMAGE_SUBVOLUME: | |
879 | case IMAGE_DIRECTORY: | |
9a50e3ca | 880 | /* If we can we'll always try to create a new btrfs subvolume here, even if the source is a plain |
13e785f7 | 881 | * directory. */ |
9a50e3ca | 882 | |
63c372cb | 883 | new_path = strjoina("/var/lib/machines/", new_name); |
ebd93cb6 | 884 | |
17cbb288 LP |
885 | r = btrfs_subvol_snapshot(i->path, new_path, |
886 | (read_only ? BTRFS_SNAPSHOT_READ_ONLY : 0) | | |
887 | BTRFS_SNAPSHOT_FALLBACK_COPY | | |
888 | BTRFS_SNAPSHOT_FALLBACK_DIRECTORY | | |
889 | BTRFS_SNAPSHOT_FALLBACK_IMMUTABLE | | |
890 | BTRFS_SNAPSHOT_RECURSIVE | | |
891 | BTRFS_SNAPSHOT_QUOTA); | |
892 | if (r >= 0) | |
9a50e3ca | 893 | /* Enable "subtree" quotas for the copy, if we didn't copy any quota from the source. */ |
8120ee28 | 894 | (void) btrfs_subvol_auto_qgroup(new_path, 0, true); |
5bcd08db | 895 | |
ebd93cb6 LP |
896 | break; |
897 | ||
aceac2f0 | 898 | case IMAGE_RAW: |
63c372cb | 899 | new_path = strjoina("/var/lib/machines/", new_name, ".raw"); |
ebd93cb6 | 900 | |
8a016c74 | 901 | r = copy_file_atomic(i->path, new_path, read_only ? 0444 : 0644, FS_NOCOW_FL, FS_NOCOW_FL, COPY_REFLINK|COPY_CRTIME); |
ebd93cb6 LP |
902 | break; |
903 | ||
eb38edce | 904 | case IMAGE_BLOCK: |
ebd93cb6 | 905 | default: |
15411c0c | 906 | return -EOPNOTSUPP; |
ebd93cb6 LP |
907 | } |
908 | ||
909 | if (r < 0) | |
910 | return r; | |
911 | ||
8e0b6570 | 912 | STRV_FOREACH(j, settings) { |
bafbac4e | 913 | r = clone_auxiliary_file(*j, new_name, ".nspawn"); |
8e0b6570 LP |
914 | if (r < 0 && r != -ENOENT) |
915 | log_debug_errno(r, "Failed to clone settings %s, ignoring: %m", *j); | |
916 | } | |
917 | ||
bafbac4e LP |
918 | r = clone_auxiliary_file(roothash, new_name, ".roothash"); |
919 | if (r < 0 && r != -ENOENT) | |
920 | log_debug_errno(r, "Failed to clone root hash file %s, ignoring: %m", roothash); | |
921 | ||
ebd93cb6 LP |
922 | return 0; |
923 | } | |
924 | ||
925 | int image_read_only(Image *i, bool b) { | |
8e766630 | 926 | _cleanup_(release_lock_file) LockFile global_lock = LOCK_FILE_INIT, local_lock = LOCK_FILE_INIT; |
ebd93cb6 | 927 | int r; |
c7664c07 | 928 | |
ebd93cb6 LP |
929 | assert(i); |
930 | ||
d94c2b06 | 931 | if (IMAGE_IS_VENDOR(i) || IMAGE_IS_HOST(i)) |
ebd93cb6 LP |
932 | return -EROFS; |
933 | ||
30535c16 LP |
934 | /* Make sure we don't interfere with a running nspawn */ |
935 | r = image_path_lock(i->path, LOCK_EX|LOCK_NB, &global_lock, &local_lock); | |
936 | if (r < 0) | |
937 | return r; | |
938 | ||
ebd93cb6 LP |
939 | switch (i->type) { |
940 | ||
941 | case IMAGE_SUBVOLUME: | |
5bcd08db LP |
942 | |
943 | /* Note that we set the flag only on the top-level | |
944 | * subvolume of the image. */ | |
945 | ||
ebd93cb6 LP |
946 | r = btrfs_subvol_set_read_only(i->path, b); |
947 | if (r < 0) | |
948 | return r; | |
01b72568 LP |
949 | |
950 | break; | |
951 | ||
952 | case IMAGE_DIRECTORY: | |
953 | /* For simple directory trees we cannot use the access | |
954 | mode of the top-level directory, since it has an | |
955 | effect on the container itself. However, we can | |
956 | use the "immutable" flag, to at least make the | |
957 | top-level directory read-only. It's not as good as | |
958 | a read-only subvolume, but at least something, and | |
13e785f7 | 959 | we can read the value back. */ |
01b72568 | 960 | |
db9a4254 | 961 | r = chattr_path(i->path, b ? FS_IMMUTABLE_FL : 0, FS_IMMUTABLE_FL, NULL); |
01b72568 LP |
962 | if (r < 0) |
963 | return r; | |
964 | ||
ebd93cb6 LP |
965 | break; |
966 | ||
aceac2f0 | 967 | case IMAGE_RAW: { |
ebd93cb6 LP |
968 | struct stat st; |
969 | ||
970 | if (stat(i->path, &st) < 0) | |
971 | return -errno; | |
972 | ||
973 | if (chmod(i->path, (st.st_mode & 0444) | (b ? 0000 : 0200)) < 0) | |
974 | return -errno; | |
f2068bcc LP |
975 | |
976 | /* If the images is now read-only, it's a good time to | |
977 | * defrag it, given that no write patterns will | |
978 | * fragment it again. */ | |
979 | if (b) | |
980 | (void) btrfs_defrag(i->path); | |
ebd93cb6 LP |
981 | break; |
982 | } | |
983 | ||
eb38edce | 984 | case IMAGE_BLOCK: { |
254d1313 | 985 | _cleanup_close_ int fd = -EBADF; |
eb38edce LP |
986 | struct stat st; |
987 | int state = b; | |
988 | ||
989 | fd = open(i->path, O_CLOEXEC|O_RDONLY|O_NONBLOCK|O_NOCTTY); | |
990 | if (fd < 0) | |
991 | return -errno; | |
992 | ||
993 | if (fstat(fd, &st) < 0) | |
994 | return -errno; | |
995 | if (!S_ISBLK(st.st_mode)) | |
996 | return -ENOTTY; | |
997 | ||
998 | if (ioctl(fd, BLKROSET, &state) < 0) | |
999 | return -errno; | |
1000 | ||
1001 | break; | |
1002 | } | |
1003 | ||
ebd93cb6 | 1004 | default: |
15411c0c | 1005 | return -EOPNOTSUPP; |
ebd93cb6 LP |
1006 | } |
1007 | ||
1008 | return 0; | |
08682124 LP |
1009 | } |
1010 | ||
30535c16 LP |
1011 | int image_path_lock(const char *path, int operation, LockFile *global, LockFile *local) { |
1012 | _cleanup_free_ char *p = NULL; | |
1013 | LockFile t = LOCK_FILE_INIT; | |
1014 | struct stat st; | |
f25bed67 | 1015 | bool exclusive; |
30535c16 LP |
1016 | int r; |
1017 | ||
1018 | assert(path); | |
1019 | assert(global); | |
1020 | assert(local); | |
1021 | ||
f25bed67 LP |
1022 | /* Locks an image path. This actually creates two locks: one "local" one, next to the image path |
1023 | * itself, which might be shared via NFS. And another "global" one, in /run, that uses the | |
1024 | * device/inode number. This has the benefit that we can even lock a tree that is a mount point, | |
1025 | * correctly. */ | |
30535c16 | 1026 | |
30535c16 LP |
1027 | if (!path_is_absolute(path)) |
1028 | return -EINVAL; | |
1029 | ||
f25bed67 LP |
1030 | switch (operation & (LOCK_SH|LOCK_EX)) { |
1031 | case LOCK_SH: | |
1032 | exclusive = false; | |
1033 | break; | |
1034 | case LOCK_EX: | |
1035 | exclusive = true; | |
1036 | break; | |
1037 | default: | |
1038 | return -EINVAL; | |
1039 | } | |
1040 | ||
b6e953f2 LP |
1041 | if (getenv_bool("SYSTEMD_NSPAWN_LOCK") == 0) { |
1042 | *local = *global = (LockFile) LOCK_FILE_INIT; | |
1043 | return 0; | |
1044 | } | |
1045 | ||
f25bed67 LP |
1046 | /* Prohibit taking exclusive locks on the host image. We can't allow this, since we ourselves are |
1047 | * running off it after all, and we don't want any images to manipulate the host image. We make an | |
1048 | * exception for shared locks however: we allow those (and make them NOPs since there's no point in | |
1049 | * taking them if there can't be exclusive locks). Strictly speaking these are questionable as well, | |
1050 | * since it means changes made to the host might propagate to the container as they happen (and a | |
1051 | * shared lock kinda suggests that no changes happen at all while it is in place), but it's too | |
1052 | * useful not to allow read-only containers off the host root, hence let's support this, and trust | |
1053 | * the user to do the right thing with this. */ | |
1054 | if (path_equal(path, "/")) { | |
1055 | if (exclusive) | |
1056 | return -EBUSY; | |
1057 | ||
1058 | *local = *global = (LockFile) LOCK_FILE_INIT; | |
1059 | return 0; | |
1060 | } | |
b6e953f2 | 1061 | |
30535c16 | 1062 | if (stat(path, &st) >= 0) { |
eb38edce LP |
1063 | if (S_ISBLK(st.st_mode)) |
1064 | r = asprintf(&p, "/run/systemd/nspawn/locks/block-%u:%u", major(st.st_rdev), minor(st.st_rdev)); | |
1065 | else if (S_ISDIR(st.st_mode) || S_ISREG(st.st_mode)) | |
1066 | r = asprintf(&p, "/run/systemd/nspawn/locks/inode-%lu:%lu", (unsigned long) st.st_dev, (unsigned long) st.st_ino); | |
1067 | else | |
1068 | return -ENOTTY; | |
eb38edce | 1069 | if (r < 0) |
30535c16 LP |
1070 | return -ENOMEM; |
1071 | } | |
1072 | ||
f25bed67 LP |
1073 | /* For block devices we don't need the "local" lock, as the major/minor lock above should be |
1074 | * sufficient, since block devices are host local anyway. */ | |
1075 | if (!path_startswith(path, "/dev/")) { | |
eb38edce | 1076 | r = make_lock_file_for(path, operation, &t); |
8be17c9b | 1077 | if (r < 0) { |
f25bed67 | 1078 | if (!exclusive && r == -EROFS) |
771b7ead | 1079 | log_debug_errno(r, "Failed to create shared lock for '%s', ignoring: %m", path); |
8be17c9b LT |
1080 | else |
1081 | return r; | |
1082 | } | |
eb38edce | 1083 | } |
30535c16 LP |
1084 | |
1085 | if (p) { | |
6e5dcce4 | 1086 | (void) mkdir_p("/run/systemd/nspawn/locks", 0700); |
30535c16 LP |
1087 | |
1088 | r = make_lock_file(p, operation, global); | |
1089 | if (r < 0) { | |
1090 | release_lock_file(&t); | |
1091 | return r; | |
1092 | } | |
546dbec5 LP |
1093 | } else |
1094 | *global = (LockFile) LOCK_FILE_INIT; | |
30535c16 LP |
1095 | |
1096 | *local = t; | |
1097 | return 0; | |
1098 | } | |
1099 | ||
cb81cd80 | 1100 | int image_set_limit(Image *i, uint64_t referenced_max) { |
d6ce17c7 LP |
1101 | assert(i); |
1102 | ||
d94c2b06 | 1103 | if (IMAGE_IS_VENDOR(i) || IMAGE_IS_HOST(i)) |
d6ce17c7 LP |
1104 | return -EROFS; |
1105 | ||
1106 | if (i->type != IMAGE_SUBVOLUME) | |
15411c0c | 1107 | return -EOPNOTSUPP; |
d6ce17c7 | 1108 | |
5bcd08db LP |
1109 | /* We set the quota both for the subvolume as well as for the |
1110 | * subtree. The latter is mostly for historical reasons, since | |
1111 | * we didn't use to have a concept of subtree quota, and hence | |
1112 | * only modified the subvolume quota. */ | |
1113 | ||
1114 | (void) btrfs_qgroup_set_limit(i->path, 0, referenced_max); | |
1115 | (void) btrfs_subvol_auto_qgroup(i->path, 0, true); | |
1116 | return btrfs_subvol_set_subtree_quota_limit(i->path, 0, referenced_max); | |
d6ce17c7 LP |
1117 | } |
1118 | ||
c7664c07 | 1119 | int image_read_metadata(Image *i) { |
8e766630 | 1120 | _cleanup_(release_lock_file) LockFile global_lock = LOCK_FILE_INIT, local_lock = LOCK_FILE_INIT; |
c7664c07 LP |
1121 | int r; |
1122 | ||
1123 | assert(i); | |
1124 | ||
1125 | r = image_path_lock(i->path, LOCK_SH|LOCK_NB, &global_lock, &local_lock); | |
1126 | if (r < 0) | |
1127 | return r; | |
1128 | ||
1129 | switch (i->type) { | |
1130 | ||
1131 | case IMAGE_SUBVOLUME: | |
1132 | case IMAGE_DIRECTORY: { | |
bcf94222 | 1133 | _cleanup_strv_free_ char **machine_info = NULL, **os_release = NULL, **extension_release = NULL; |
c7664c07 LP |
1134 | sd_id128_t machine_id = SD_ID128_NULL; |
1135 | _cleanup_free_ char *hostname = NULL; | |
1136 | _cleanup_free_ char *path = NULL; | |
1137 | ||
a5648b80 | 1138 | r = chase_symlinks("/etc/hostname", i->path, CHASE_PREFIX_ROOT|CHASE_TRAIL_SLASH, &path, NULL); |
c7664c07 LP |
1139 | if (r < 0 && r != -ENOENT) |
1140 | log_debug_errno(r, "Failed to chase /etc/hostname in image %s: %m", i->name); | |
1141 | else if (r >= 0) { | |
1142 | r = read_etc_hostname(path, &hostname); | |
1143 | if (r < 0) | |
1144 | log_debug_errno(errno, "Failed to read /etc/hostname of image %s: %m", i->name); | |
1145 | } | |
1146 | ||
1147 | path = mfree(path); | |
1148 | ||
a5648b80 | 1149 | r = chase_symlinks("/etc/machine-id", i->path, CHASE_PREFIX_ROOT|CHASE_TRAIL_SLASH, &path, NULL); |
c7664c07 LP |
1150 | if (r < 0 && r != -ENOENT) |
1151 | log_debug_errno(r, "Failed to chase /etc/machine-id in image %s: %m", i->name); | |
1152 | else if (r >= 0) { | |
254d1313 | 1153 | _cleanup_close_ int fd = -EBADF; |
c7664c07 LP |
1154 | |
1155 | fd = open(path, O_RDONLY|O_CLOEXEC|O_NOCTTY); | |
1156 | if (fd < 0) | |
1157 | log_debug_errno(errno, "Failed to open %s: %m", path); | |
1158 | else { | |
057bf780 | 1159 | r = id128_read_fd(fd, ID128_FORMAT_PLAIN, &machine_id); |
c7664c07 LP |
1160 | if (r < 0) |
1161 | log_debug_errno(r, "Image %s contains invalid machine ID.", i->name); | |
1162 | } | |
1163 | } | |
1164 | ||
1165 | path = mfree(path); | |
1166 | ||
a5648b80 | 1167 | r = chase_symlinks("/etc/machine-info", i->path, CHASE_PREFIX_ROOT|CHASE_TRAIL_SLASH, &path, NULL); |
c7664c07 LP |
1168 | if (r < 0 && r != -ENOENT) |
1169 | log_debug_errno(r, "Failed to chase /etc/machine-info in image %s: %m", i->name); | |
1170 | else if (r >= 0) { | |
aa8fbc74 | 1171 | r = load_env_file_pairs(NULL, path, &machine_info); |
c7664c07 LP |
1172 | if (r < 0) |
1173 | log_debug_errno(r, "Failed to parse machine-info data of %s: %m", i->name); | |
1174 | } | |
1175 | ||
d58ad743 LP |
1176 | r = load_os_release_pairs(i->path, &os_release); |
1177 | if (r < 0) | |
1178 | log_debug_errno(r, "Failed to read os-release in image, ignoring: %m"); | |
c7664c07 | 1179 | |
06768b90 | 1180 | r = load_extension_release_pairs(i->path, i->name, /* relax_extension_release_check= */ false, &extension_release); |
bcf94222 LB |
1181 | if (r < 0) |
1182 | log_debug_errno(r, "Failed to read extension-release in image, ignoring: %m"); | |
1183 | ||
c7664c07 LP |
1184 | free_and_replace(i->hostname, hostname); |
1185 | i->machine_id = machine_id; | |
1186 | strv_free_and_replace(i->machine_info, machine_info); | |
1187 | strv_free_and_replace(i->os_release, os_release); | |
bcf94222 | 1188 | strv_free_and_replace(i->extension_release, extension_release); |
c7664c07 LP |
1189 | |
1190 | break; | |
1191 | } | |
1192 | ||
1193 | case IMAGE_RAW: | |
1194 | case IMAGE_BLOCK: { | |
1195 | _cleanup_(loop_device_unrefp) LoopDevice *d = NULL; | |
1196 | _cleanup_(dissected_image_unrefp) DissectedImage *m = NULL; | |
1197 | ||
22ee78a8 | 1198 | r = loop_device_make_by_path(i->path, O_RDONLY, /* sector_size= */ UINT32_MAX, LO_FLAGS_PARTSCAN, LOCK_SH, &d); |
41bc4849 LP |
1199 | if (r < 0) |
1200 | return r; | |
1201 | ||
bad31660 YW |
1202 | r = dissect_loop_device( |
1203 | d, | |
d04faa4e | 1204 | NULL, NULL, |
4b5de5dd LP |
1205 | DISSECT_IMAGE_GENERIC_ROOT | |
1206 | DISSECT_IMAGE_REQUIRE_ROOT | | |
1207 | DISSECT_IMAGE_RELAX_VAR_CHECK | | |
f6f4ec79 | 1208 | DISSECT_IMAGE_READ_ONLY | |
73d88b80 LP |
1209 | DISSECT_IMAGE_USR_NO_ROOT | |
1210 | DISSECT_IMAGE_ADD_PARTITION_DEVICES | | |
1211 | DISSECT_IMAGE_PIN_PARTITION_DEVICES, | |
75dc190d | 1212 | &m); |
c7664c07 LP |
1213 | if (r < 0) |
1214 | return r; | |
1215 | ||
22847508 ZJS |
1216 | r = dissected_image_acquire_metadata(m, |
1217 | DISSECT_IMAGE_VALIDATE_OS | | |
1218 | DISSECT_IMAGE_VALIDATE_OS_EXT); | |
c7664c07 LP |
1219 | if (r < 0) |
1220 | return r; | |
1221 | ||
1222 | free_and_replace(i->hostname, m->hostname); | |
1223 | i->machine_id = m->machine_id; | |
1224 | strv_free_and_replace(i->machine_info, m->machine_info); | |
1225 | strv_free_and_replace(i->os_release, m->os_release); | |
bcf94222 | 1226 | strv_free_and_replace(i->extension_release, m->extension_release); |
c7664c07 LP |
1227 | |
1228 | break; | |
1229 | } | |
1230 | ||
1231 | default: | |
1232 | return -EOPNOTSUPP; | |
1233 | } | |
1234 | ||
1235 | i->metadata_valid = true; | |
1236 | ||
1237 | return 0; | |
1238 | } | |
1239 | ||
30535c16 | 1240 | int image_name_lock(const char *name, int operation, LockFile *ret) { |
99d97afc LP |
1241 | const char *p; |
1242 | ||
30535c16 LP |
1243 | assert(name); |
1244 | assert(ret); | |
1245 | ||
1246 | /* Locks an image name, regardless of the precise path used. */ | |
1247 | ||
99d97afc LP |
1248 | if (streq(name, ".host")) |
1249 | return -EBUSY; | |
1250 | ||
30535c16 LP |
1251 | if (!image_name_is_valid(name)) |
1252 | return -EINVAL; | |
1253 | ||
b6e953f2 LP |
1254 | if (getenv_bool("SYSTEMD_NSPAWN_LOCK") == 0) { |
1255 | *ret = (LockFile) LOCK_FILE_INIT; | |
1256 | return 0; | |
1257 | } | |
1258 | ||
6e5dcce4 | 1259 | (void) mkdir_p("/run/systemd/nspawn/locks", 0700); |
99d97afc LP |
1260 | |
1261 | p = strjoina("/run/systemd/nspawn/locks/name-", name); | |
30535c16 LP |
1262 | return make_lock_file(p, operation, ret); |
1263 | } | |
1264 | ||
d577d4a4 LP |
1265 | bool image_in_search_path( |
1266 | ImageClass class, | |
1267 | const char *root, | |
1268 | const char *image) { | |
1269 | ||
ace9ab19 LP |
1270 | assert(image); |
1271 | ||
1272 | NULSTR_FOREACH(path, image_search_path[class]) { | |
d577d4a4 | 1273 | const char *p, *q; |
ace9ab19 LP |
1274 | size_t k; |
1275 | ||
d577d4a4 LP |
1276 | if (!empty_or_root(root)) { |
1277 | q = path_startswith(path, root); | |
1278 | if (!q) | |
1279 | continue; | |
1280 | } else | |
1281 | q = path; | |
1282 | ||
1283 | p = path_startswith(q, path); | |
ace9ab19 LP |
1284 | if (!p) |
1285 | continue; | |
1286 | ||
1287 | /* Make sure there's a filename following */ | |
1288 | k = strcspn(p, "/"); | |
1289 | if (k == 0) | |
1290 | continue; | |
1291 | ||
1292 | p += k; | |
1293 | ||
1294 | /* Accept trailing slashes */ | |
1295 | if (p[strspn(p, "/")] == 0) | |
1296 | return true; | |
1297 | ||
1298 | } | |
1299 | ||
1300 | return false; | |
1301 | } | |
1302 | ||
cd61c3bf LP |
1303 | static const char* const image_type_table[_IMAGE_TYPE_MAX] = { |
1304 | [IMAGE_DIRECTORY] = "directory", | |
1305 | [IMAGE_SUBVOLUME] = "subvolume", | |
aceac2f0 | 1306 | [IMAGE_RAW] = "raw", |
eb38edce | 1307 | [IMAGE_BLOCK] = "block", |
cd61c3bf LP |
1308 | }; |
1309 | ||
1310 | DEFINE_STRING_TABLE_LOOKUP(image_type, ImageType); | |
e0cd1900 LP |
1311 | |
1312 | static const char* const image_class_table[_IMAGE_CLASS_MAX] = { | |
1313 | [IMAGE_MACHINE] = "machine", | |
1314 | [IMAGE_PORTABLE] = "portable", | |
1315 | [IMAGE_EXTENSION] = "extension", | |
1316 | }; | |
1317 | ||
1318 | DEFINE_STRING_TABLE_LOOKUP(image_class, ImageClass); |