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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> | |
a8fbdf54 TA |
7 | #include <stdio.h> |
8 | #include <stdlib.h> | |
e306723e | 9 | #include <sys/file.h> |
204f52e3 | 10 | #include <sys/ioctl.h> |
a8fbdf54 TA |
11 | #include <sys/stat.h> |
12 | #include <unistd.h> | |
546dbec5 | 13 | |
b5efdb8a | 14 | #include "alloc-util.h" |
cd61c3bf | 15 | #include "btrfs-util.h" |
c8b3094d | 16 | #include "chattr-util.h" |
ebd93cb6 | 17 | #include "copy.h" |
a0956174 | 18 | #include "dirent-util.h" |
57f1b61b | 19 | #include "discover-image.h" |
c7664c07 | 20 | #include "dissect-image.h" |
686d13b9 | 21 | #include "env-file.h" |
b6e953f2 | 22 | #include "env-util.h" |
3ffd4af2 | 23 | #include "fd-util.h" |
f4f15635 | 24 | #include "fs-util.h" |
a8fbdf54 | 25 | #include "hashmap.h" |
e2054217 | 26 | #include "hostname-setup.h" |
c7664c07 | 27 | #include "id128-util.h" |
a8fbdf54 TA |
28 | #include "lockfile-util.h" |
29 | #include "log.h" | |
c7664c07 | 30 | #include "loop-util.h" |
546dbec5 | 31 | #include "macro.h" |
30535c16 | 32 | #include "mkdir.h" |
d8b4d14d | 33 | #include "nulstr-util.h" |
d58ad743 | 34 | #include "os-util.h" |
8e0b6570 | 35 | #include "path-util.h" |
c6878637 | 36 | #include "rm-rf.h" |
8b43440b | 37 | #include "string-table.h" |
07630cea | 38 | #include "string-util.h" |
8e0b6570 | 39 | #include "strv.h" |
a8fbdf54 | 40 | #include "time-util.h" |
8e0b6570 | 41 | #include "utf8.h" |
89a5a90c | 42 | #include "xattr-util.h" |
cd61c3bf | 43 | |
5ef46e5f | 44 | static const char* const image_search_path[_IMAGE_CLASS_MAX] = { |
9bca4ae4 LP |
45 | [IMAGE_MACHINE] = "/etc/machines\0" /* only place symlinks here */ |
46 | "/run/machines\0" /* and here too */ | |
47 | "/var/lib/machines\0" /* the main place for images */ | |
48 | "/var/lib/container\0" /* legacy */ | |
49 | "/usr/local/lib/machines\0" | |
50 | "/usr/lib/machines\0", | |
5ef46e5f | 51 | |
9bca4ae4 LP |
52 | [IMAGE_PORTABLE] = "/etc/portables\0" /* only place symlinks here */ |
53 | "/run/portables\0" /* and here too */ | |
54 | "/var/lib/portables\0" /* the main place for images */ | |
55 | "/usr/local/lib/portables\0" | |
56 | "/usr/lib/portables\0", | |
57 | ||
58 | [IMAGE_EXTENSION] = "/etc/extensions\0" /* only place symlinks here */ | |
59 | "/run/extensions\0" /* and here too */ | |
60 | "/var/lib/extensions\0" /* the main place for images */ | |
61 | "/usr/local/lib/extensions\0" | |
62 | "/usr/lib/extensions\0", | |
5ef46e5f | 63 | }; |
c2ce6a3d | 64 | |
8301aa0b YW |
65 | static Image *image_free(Image *i) { |
66 | assert(i); | |
9614bb06 | 67 | |
cd61c3bf LP |
68 | free(i->name); |
69 | free(i->path); | |
c7664c07 LP |
70 | |
71 | free(i->hostname); | |
72 | strv_free(i->machine_info); | |
73 | strv_free(i->os_release); | |
bcf94222 | 74 | strv_free(i->extension_release); |
c7664c07 | 75 | |
6b430fdb | 76 | return mfree(i); |
cd61c3bf LP |
77 | } |
78 | ||
8301aa0b | 79 | DEFINE_TRIVIAL_REF_UNREF_FUNC(Image, image, image_free); |
b07ec5a1 YW |
80 | DEFINE_HASH_OPS_WITH_VALUE_DESTRUCTOR(image_hash_ops, char, string_hash_func, string_compare_func, |
81 | Image, image_unref); | |
9614bb06 | 82 | |
8e0b6570 LP |
83 | static char **image_settings_path(Image *image) { |
84 | _cleanup_strv_free_ char **l = NULL; | |
8e0b6570 LP |
85 | const char *fn, *s; |
86 | unsigned i = 0; | |
87 | ||
88 | assert(image); | |
89 | ||
90 | l = new0(char*, 4); | |
91 | if (!l) | |
92 | return NULL; | |
93 | ||
94 | fn = strjoina(image->name, ".nspawn"); | |
95 | ||
b910cc72 LP |
96 | FOREACH_STRING(s, "/etc/systemd/nspawn", "/run/systemd/nspawn") { |
97 | l[i] = path_join(s, fn); | |
8e0b6570 LP |
98 | if (!l[i]) |
99 | return NULL; | |
100 | ||
101 | i++; | |
102 | } | |
103 | ||
104 | l[i] = file_in_same_dir(image->path, fn); | |
105 | if (!l[i]) | |
106 | return NULL; | |
107 | ||
ae2a15bc | 108 | return TAKE_PTR(l); |
8e0b6570 LP |
109 | } |
110 | ||
bafbac4e LP |
111 | static char *image_roothash_path(Image *image) { |
112 | const char *fn; | |
113 | ||
114 | assert(image); | |
115 | ||
116 | fn = strjoina(image->name, ".roothash"); | |
117 | ||
118 | return file_in_same_dir(image->path, fn); | |
119 | } | |
120 | ||
c2ce6a3d | 121 | static int image_new( |
cd61c3bf | 122 | ImageType t, |
5fc7f358 | 123 | const char *pretty, |
cd61c3bf | 124 | const char *path, |
5fc7f358 | 125 | const char *filename, |
cd61c3bf | 126 | bool read_only, |
10f9c755 | 127 | usec_t crtime, |
cd61c3bf | 128 | usec_t mtime, |
c2ce6a3d | 129 | Image **ret) { |
cd61c3bf LP |
130 | |
131 | _cleanup_(image_unrefp) Image *i = NULL; | |
cd61c3bf | 132 | |
cd61c3bf LP |
133 | assert(t >= 0); |
134 | assert(t < _IMAGE_TYPE_MAX); | |
5fc7f358 LP |
135 | assert(pretty); |
136 | assert(filename); | |
c2ce6a3d | 137 | assert(ret); |
cd61c3bf | 138 | |
c2108701 | 139 | i = new(Image, 1); |
cd61c3bf LP |
140 | if (!i) |
141 | return -ENOMEM; | |
142 | ||
c2108701 LP |
143 | *i = (Image) { |
144 | .n_ref = 1, | |
145 | .type = t, | |
146 | .read_only = read_only, | |
147 | .crtime = crtime, | |
148 | .mtime = mtime, | |
149 | .usage = UINT64_MAX, | |
150 | .usage_exclusive = UINT64_MAX, | |
151 | .limit = UINT64_MAX, | |
152 | .limit_exclusive = UINT64_MAX, | |
153 | }; | |
cd61c3bf | 154 | |
5fc7f358 | 155 | i->name = strdup(pretty); |
cd61c3bf LP |
156 | if (!i->name) |
157 | return -ENOMEM; | |
158 | ||
657ee2d8 | 159 | i->path = path_join(path, filename); |
5fc7f358 LP |
160 | if (!i->path) |
161 | return -ENOMEM; | |
162 | ||
858d36c1 | 163 | path_simplify(i->path, false); |
cd61c3bf | 164 | |
1cc6c93a | 165 | *ret = TAKE_PTR(i); |
c2ce6a3d | 166 | |
cd61c3bf LP |
167 | return 0; |
168 | } | |
169 | ||
4756c94e LP |
170 | static int extract_pretty(const char *path, const char *suffix, char **ret) { |
171 | _cleanup_free_ char *name = NULL; | |
172 | const char *p; | |
173 | size_t n; | |
174 | ||
175 | assert(path); | |
176 | assert(ret); | |
177 | ||
178 | p = last_path_component(path); | |
179 | n = strcspn(p, "/"); | |
180 | ||
181 | name = strndup(p, n); | |
182 | if (!name) | |
183 | return -ENOMEM; | |
184 | ||
185 | if (suffix) { | |
186 | char *e; | |
187 | ||
188 | e = endswith(name, suffix); | |
189 | if (!e) | |
190 | return -EINVAL; | |
191 | ||
192 | *e = 0; | |
193 | } | |
194 | ||
195 | if (!image_name_is_valid(name)) | |
196 | return -EINVAL; | |
197 | ||
198 | *ret = TAKE_PTR(name); | |
199 | return 0; | |
200 | } | |
201 | ||
5fc7f358 LP |
202 | static int image_make( |
203 | const char *pretty, | |
204 | int dfd, | |
205 | const char *path, | |
206 | const char *filename, | |
3a6ce860 | 207 | const struct stat *st, |
5fc7f358 LP |
208 | Image **ret) { |
209 | ||
2570578d | 210 | _cleanup_free_ char *pretty_buffer = NULL, *parent = NULL; |
3a6ce860 | 211 | struct stat stbuf; |
5fc7f358 | 212 | bool read_only; |
cd61c3bf LP |
213 | int r; |
214 | ||
3a6ce860 | 215 | assert(dfd >= 0 || dfd == AT_FDCWD); |
bcb846f3 | 216 | assert(path || dfd == AT_FDCWD); |
5fc7f358 | 217 | assert(filename); |
cd61c3bf | 218 | |
eb38edce | 219 | /* We explicitly *do* follow symlinks here, since we want to allow symlinking trees, raw files and block |
3a6ce860 LP |
220 | * devices into /var/lib/machines/, and treat them normally. |
221 | * | |
222 | * This function returns -ENOENT if we can't find the image after all, and -EMEDIUMTYPE if it's not a file we | |
223 | * recognize. */ | |
cd61c3bf | 224 | |
3a6ce860 LP |
225 | if (!st) { |
226 | if (fstatat(dfd, filename, &stbuf, 0) < 0) | |
227 | return -errno; | |
228 | ||
229 | st = &stbuf; | |
230 | } | |
cd61c3bf | 231 | |
2570578d LP |
232 | if (!path) { |
233 | if (dfd == AT_FDCWD) | |
234 | (void) safe_getcwd(&parent); | |
235 | else | |
236 | (void) fd_get_path(dfd, &parent); | |
237 | } | |
bcb846f3 | 238 | |
5fc7f358 LP |
239 | read_only = |
240 | (path && path_startswith(path, "/usr")) || | |
08ff5529 | 241 | (faccessat(dfd, filename, W_OK, AT_EACCESS) < 0 && errno == EROFS); |
86e339c8 | 242 | |
3a6ce860 | 243 | if (S_ISDIR(st->st_mode)) { |
01b72568 LP |
244 | _cleanup_close_ int fd = -1; |
245 | unsigned file_attr = 0; | |
02dcf215 | 246 | usec_t crtime = 0; |
cd61c3bf | 247 | |
c2ce6a3d | 248 | if (!ret) |
3a6ce860 | 249 | return 0; |
cd61c3bf | 250 | |
4756c94e LP |
251 | if (!pretty) { |
252 | r = extract_pretty(filename, NULL, &pretty_buffer); | |
253 | if (r < 0) | |
254 | return r; | |
255 | ||
256 | pretty = pretty_buffer; | |
257 | } | |
5fc7f358 | 258 | |
01b72568 LP |
259 | fd = openat(dfd, filename, O_CLOEXEC|O_NOCTTY|O_DIRECTORY); |
260 | if (fd < 0) | |
261 | return -errno; | |
262 | ||
c2ce6a3d | 263 | /* btrfs subvolumes have inode 256 */ |
3a6ce860 | 264 | if (st->st_ino == 256) { |
cd61c3bf | 265 | |
21222ea5 LP |
266 | r = btrfs_is_filesystem(fd); |
267 | if (r < 0) | |
268 | return r; | |
269 | if (r) { | |
10f9c755 | 270 | BtrfsSubvolInfo info; |
cd61c3bf | 271 | |
c2ce6a3d | 272 | /* It's a btrfs subvolume */ |
cd61c3bf | 273 | |
5bcd08db | 274 | r = btrfs_subvol_get_info_fd(fd, 0, &info); |
10f9c755 LP |
275 | if (r < 0) |
276 | return r; | |
c2ce6a3d LP |
277 | |
278 | r = image_new(IMAGE_SUBVOLUME, | |
5fc7f358 | 279 | pretty, |
c2ce6a3d | 280 | path, |
5fc7f358 LP |
281 | filename, |
282 | info.read_only || read_only, | |
10f9c755 | 283 | info.otime, |
c2ce6a3d | 284 | 0, |
c2ce6a3d LP |
285 | ret); |
286 | if (r < 0) | |
287 | return r; | |
288 | ||
5bcd08db LP |
289 | if (btrfs_quota_scan_ongoing(fd) == 0) { |
290 | BtrfsQuotaInfo quota; | |
b6b18498 | 291 | |
5bcd08db LP |
292 | r = btrfs_subvol_get_subtree_quota_fd(fd, 0, "a); |
293 | if (r >= 0) { | |
294 | (*ret)->usage = quota.referenced; | |
295 | (*ret)->usage_exclusive = quota.exclusive; | |
296 | ||
297 | (*ret)->limit = quota.referenced_max; | |
298 | (*ret)->limit_exclusive = quota.exclusive_max; | |
299 | } | |
b6b18498 LP |
300 | } |
301 | ||
3a6ce860 | 302 | return 0; |
cd61c3bf | 303 | } |
c2ce6a3d | 304 | } |
cd61c3bf | 305 | |
02dcf215 LP |
306 | /* Get directory creation time (not available everywhere, but that's OK */ |
307 | (void) fd_getcrtime(dfd, &crtime); | |
308 | ||
309 | /* If the IMMUTABLE bit is set, we consider the directory read-only. Since the ioctl is not | |
01b72568 LP |
310 | * supported everywhere we ignore failures. */ |
311 | (void) read_attr_fd(fd, &file_attr); | |
cd61c3bf | 312 | |
01b72568 | 313 | /* It's just a normal directory. */ |
c2ce6a3d | 314 | r = image_new(IMAGE_DIRECTORY, |
5fc7f358 | 315 | pretty, |
c2ce6a3d | 316 | path, |
5fc7f358 | 317 | filename, |
01b72568 | 318 | read_only || (file_attr & FS_IMMUTABLE_FL), |
02dcf215 LP |
319 | crtime, |
320 | 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 |
321 | ret); |
322 | if (r < 0) | |
323 | return r; | |
cd61c3bf | 324 | |
3a6ce860 | 325 | return 0; |
cd61c3bf | 326 | |
3a6ce860 | 327 | } else if (S_ISREG(st->st_mode) && endswith(filename, ".raw")) { |
10f9c755 | 328 | usec_t crtime = 0; |
cd61c3bf | 329 | |
aceac2f0 | 330 | /* It's a RAW disk image */ |
cd61c3bf | 331 | |
c2ce6a3d | 332 | if (!ret) |
3a6ce860 | 333 | return 0; |
cd61c3bf | 334 | |
4756c94e | 335 | (void) fd_getcrtime_at(dfd, filename, &crtime, 0); |
10f9c755 | 336 | |
4756c94e LP |
337 | if (!pretty) { |
338 | r = extract_pretty(filename, ".raw", &pretty_buffer); | |
339 | if (r < 0) | |
340 | return r; | |
341 | ||
342 | pretty = pretty_buffer; | |
343 | } | |
10f9c755 | 344 | |
aceac2f0 | 345 | r = image_new(IMAGE_RAW, |
5fc7f358 | 346 | pretty, |
c2ce6a3d | 347 | path, |
5fc7f358 | 348 | filename, |
3a6ce860 | 349 | !(st->st_mode & 0222) || read_only, |
10f9c755 | 350 | crtime, |
3a6ce860 | 351 | timespec_load(&st->st_mtim), |
c2ce6a3d LP |
352 | ret); |
353 | if (r < 0) | |
354 | return r; | |
cd61c3bf | 355 | |
3a6ce860 LP |
356 | (*ret)->usage = (*ret)->usage_exclusive = st->st_blocks * 512; |
357 | (*ret)->limit = (*ret)->limit_exclusive = st->st_size; | |
b6b18498 | 358 | |
3a6ce860 | 359 | return 0; |
eb38edce | 360 | |
3a6ce860 | 361 | } else if (S_ISBLK(st->st_mode)) { |
eb38edce LP |
362 | _cleanup_close_ int block_fd = -1; |
363 | uint64_t size = UINT64_MAX; | |
364 | ||
365 | /* A block device */ | |
366 | ||
367 | if (!ret) | |
3a6ce860 | 368 | return 0; |
eb38edce | 369 | |
4756c94e LP |
370 | if (!pretty) { |
371 | r = extract_pretty(filename, NULL, &pretty_buffer); | |
372 | if (r < 0) | |
373 | return r; | |
374 | ||
375 | pretty = pretty_buffer; | |
376 | } | |
eb38edce LP |
377 | |
378 | block_fd = openat(dfd, filename, O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_NOCTTY); | |
379 | if (block_fd < 0) | |
2570578d | 380 | log_debug_errno(errno, "Failed to open block device %s/%s, ignoring: %m", path ?: strnull(parent), filename); |
eb38edce | 381 | else { |
3a6ce860 LP |
382 | /* Refresh stat data after opening the node */ |
383 | if (fstat(block_fd, &stbuf) < 0) | |
eb38edce | 384 | return -errno; |
3a6ce860 LP |
385 | st = &stbuf; |
386 | ||
387 | if (!S_ISBLK(st->st_mode)) /* Verify that what we opened is actually what we think it is */ | |
eb38edce LP |
388 | return -ENOTTY; |
389 | ||
390 | if (!read_only) { | |
391 | int state = 0; | |
392 | ||
393 | if (ioctl(block_fd, BLKROGET, &state) < 0) | |
2570578d | 394 | log_debug_errno(errno, "Failed to issue BLKROGET on device %s/%s, ignoring: %m", path ?: strnull(parent), filename); |
eb38edce LP |
395 | else if (state) |
396 | read_only = true; | |
397 | } | |
398 | ||
399 | if (ioctl(block_fd, BLKGETSIZE64, &size) < 0) | |
2570578d | 400 | log_debug_errno(errno, "Failed to issue BLKGETSIZE64 on device %s/%s, ignoring: %m", path ?: strnull(parent), filename); |
eb38edce LP |
401 | |
402 | block_fd = safe_close(block_fd); | |
403 | } | |
404 | ||
405 | r = image_new(IMAGE_BLOCK, | |
406 | pretty, | |
407 | path, | |
408 | filename, | |
3a6ce860 | 409 | !(st->st_mode & 0222) || read_only, |
eb38edce LP |
410 | 0, |
411 | 0, | |
412 | ret); | |
413 | if (r < 0) | |
414 | return r; | |
415 | ||
ed0cb346 | 416 | if (!IN_SET(size, 0, UINT64_MAX)) |
eb38edce LP |
417 | (*ret)->usage = (*ret)->usage_exclusive = (*ret)->limit = (*ret)->limit_exclusive = size; |
418 | ||
3a6ce860 | 419 | return 0; |
c2ce6a3d | 420 | } |
cd61c3bf | 421 | |
3a6ce860 | 422 | return -EMEDIUMTYPE; |
c2ce6a3d | 423 | } |
cd61c3bf | 424 | |
d577d4a4 LP |
425 | int image_find(ImageClass class, |
426 | const char *name, | |
427 | const char *root, | |
428 | Image **ret) { | |
429 | ||
c2ce6a3d LP |
430 | const char *path; |
431 | int r; | |
cd61c3bf | 432 | |
5ef46e5f LP |
433 | assert(class >= 0); |
434 | assert(class < _IMAGE_CLASS_MAX); | |
c2ce6a3d | 435 | assert(name); |
cd61c3bf | 436 | |
c2ce6a3d LP |
437 | /* There are no images with invalid names */ |
438 | if (!image_name_is_valid(name)) | |
3a6ce860 | 439 | return -ENOENT; |
cd61c3bf | 440 | |
5ef46e5f | 441 | NULSTR_FOREACH(path, image_search_path[class]) { |
d577d4a4 | 442 | _cleanup_free_ char *resolved = NULL; |
c2ce6a3d | 443 | _cleanup_closedir_ DIR *d = NULL; |
3a6ce860 | 444 | struct stat st; |
d577d4a4 | 445 | int flags; |
cd61c3bf | 446 | |
d577d4a4 LP |
447 | r = chase_symlinks_and_opendir(path, root, CHASE_PREFIX_ROOT, &resolved, &d); |
448 | if (r == -ENOENT) | |
449 | continue; | |
450 | if (r < 0) | |
451 | return r; | |
cd61c3bf | 452 | |
d577d4a4 LP |
453 | /* As mentioned above, we follow symlinks on this fstatat(), because we want to permit people |
454 | * to symlink block devices into the search path. (For now, we disable that when operating | |
455 | * relative to some root directory.) */ | |
456 | flags = root ? AT_SYMLINK_NOFOLLOW : 0; | |
457 | if (fstatat(dirfd(d), name, &st, flags) < 0) { | |
aceac2f0 | 458 | _cleanup_free_ char *raw = NULL; |
5fc7f358 | 459 | |
3a6ce860 LP |
460 | if (errno != ENOENT) |
461 | return -errno; | |
462 | ||
b910cc72 | 463 | raw = strjoin(name, ".raw"); |
aceac2f0 | 464 | if (!raw) |
5fc7f358 LP |
465 | return -ENOMEM; |
466 | ||
d577d4a4 | 467 | if (fstatat(dirfd(d), raw, &st, flags) < 0) { |
3a6ce860 LP |
468 | if (errno == ENOENT) |
469 | continue; | |
470 | ||
471 | return -errno; | |
472 | } | |
473 | ||
474 | if (!S_ISREG(st.st_mode)) | |
5fc7f358 | 475 | continue; |
3a6ce860 | 476 | |
d577d4a4 | 477 | r = image_make(name, dirfd(d), resolved, raw, &st, ret); |
3a6ce860 LP |
478 | |
479 | } else { | |
480 | if (!S_ISDIR(st.st_mode) && !S_ISBLK(st.st_mode)) | |
481 | continue; | |
482 | ||
d577d4a4 | 483 | r = image_make(name, dirfd(d), resolved, name, &st, ret); |
5fc7f358 | 484 | } |
3a6ce860 LP |
485 | if (IN_SET(r, -ENOENT, -EMEDIUMTYPE)) |
486 | continue; | |
c2ce6a3d LP |
487 | if (r < 0) |
488 | return r; | |
cd61c3bf | 489 | |
cf604fd4 LP |
490 | if (ret) |
491 | (*ret)->discoverable = true; | |
492 | ||
c2ce6a3d LP |
493 | return 1; |
494 | } | |
495 | ||
cf604fd4 | 496 | if (class == IMAGE_MACHINE && streq(name, ".host")) { |
d577d4a4 | 497 | r = image_make(".host", AT_FDCWD, NULL, empty_to_root(root), NULL, ret); |
cf604fd4 LP |
498 | if (r < 0) |
499 | return r; | |
500 | ||
501 | if (ret) | |
502 | (*ret)->discoverable = true; | |
503 | ||
504 | return r; | |
505 | } | |
5fc7f358 | 506 | |
3a6ce860 | 507 | return -ENOENT; |
c2ce6a3d LP |
508 | }; |
509 | ||
2ddf182b | 510 | int image_from_path(const char *path, Image **ret) { |
cf604fd4 LP |
511 | |
512 | /* Note that we don't set the 'discoverable' field of the returned object, because we don't check here whether | |
513 | * 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 | 514 | * overridden by another, different image earlier in the search path */ |
cf604fd4 | 515 | |
2ddf182b LP |
516 | if (path_equal(path, "/")) |
517 | return image_make(".host", AT_FDCWD, NULL, "/", NULL, ret); | |
518 | ||
519 | return image_make(NULL, AT_FDCWD, NULL, path, NULL, ret); | |
520 | } | |
521 | ||
d577d4a4 | 522 | int image_find_harder(ImageClass class, const char *name_or_path, const char *root, Image **ret) { |
2ddf182b | 523 | if (image_name_is_valid(name_or_path)) |
d577d4a4 | 524 | return image_find(class, name_or_path, root, ret); |
2ddf182b LP |
525 | |
526 | return image_from_path(name_or_path, ret); | |
527 | } | |
528 | ||
d577d4a4 LP |
529 | int image_discover( |
530 | ImageClass class, | |
531 | const char *root, | |
532 | Hashmap *h) { | |
533 | ||
c2ce6a3d LP |
534 | const char *path; |
535 | int r; | |
536 | ||
5ef46e5f LP |
537 | assert(class >= 0); |
538 | assert(class < _IMAGE_CLASS_MAX); | |
c2ce6a3d LP |
539 | assert(h); |
540 | ||
5ef46e5f | 541 | NULSTR_FOREACH(path, image_search_path[class]) { |
d577d4a4 | 542 | _cleanup_free_ char *resolved = NULL; |
c2ce6a3d LP |
543 | _cleanup_closedir_ DIR *d = NULL; |
544 | struct dirent *de; | |
545 | ||
d577d4a4 LP |
546 | r = chase_symlinks_and_opendir(path, root, CHASE_PREFIX_ROOT, &resolved, &d); |
547 | if (r == -ENOENT) | |
548 | continue; | |
549 | if (r < 0) | |
550 | return r; | |
c2ce6a3d LP |
551 | |
552 | FOREACH_DIRENT_ALL(de, d, return -errno) { | |
553 | _cleanup_(image_unrefp) Image *image = NULL; | |
1bf36bf9 | 554 | _cleanup_free_ char *truncated = NULL; |
3a6ce860 LP |
555 | const char *pretty; |
556 | struct stat st; | |
d577d4a4 | 557 | int flags; |
c2ce6a3d | 558 | |
1bf36bf9 | 559 | if (dot_or_dot_dot(de->d_name)) |
c2ce6a3d LP |
560 | continue; |
561 | ||
d577d4a4 LP |
562 | /* As mentioned above, we follow symlinks on this fstatat(), because we want to |
563 | * permit people to symlink block devices into the search path. */ | |
564 | flags = root ? AT_SYMLINK_NOFOLLOW : 0; | |
565 | if (fstatat(dirfd(d), de->d_name, &st, flags) < 0) { | |
3a6ce860 LP |
566 | if (errno == ENOENT) |
567 | continue; | |
568 | ||
569 | return -errno; | |
570 | } | |
571 | ||
572 | if (S_ISREG(st.st_mode)) { | |
573 | const char *e; | |
574 | ||
575 | e = endswith(de->d_name, ".raw"); | |
576 | if (!e) | |
577 | continue; | |
578 | ||
1bf36bf9 LP |
579 | truncated = strndup(de->d_name, e - de->d_name); |
580 | if (!truncated) | |
581 | return -ENOMEM; | |
582 | ||
583 | pretty = truncated; | |
3a6ce860 | 584 | } else if (S_ISDIR(st.st_mode) || S_ISBLK(st.st_mode)) |
1bf36bf9 | 585 | pretty = de->d_name; |
3a6ce860 LP |
586 | else |
587 | continue; | |
1bf36bf9 LP |
588 | |
589 | if (!image_name_is_valid(pretty)) | |
590 | continue; | |
591 | ||
592 | if (hashmap_contains(h, pretty)) | |
c2ce6a3d LP |
593 | continue; |
594 | ||
d577d4a4 | 595 | r = image_make(pretty, dirfd(d), resolved, de->d_name, &st, &image); |
3a6ce860 | 596 | if (IN_SET(r, -ENOENT, -EMEDIUMTYPE)) |
c2ce6a3d LP |
597 | continue; |
598 | if (r < 0) | |
599 | return r; | |
600 | ||
cf604fd4 LP |
601 | image->discoverable = true; |
602 | ||
c2ce6a3d LP |
603 | r = hashmap_put(h, image->name, image); |
604 | if (r < 0) | |
605 | return r; | |
606 | ||
607 | image = NULL; | |
cd61c3bf LP |
608 | } |
609 | } | |
610 | ||
5ef46e5f | 611 | if (class == IMAGE_MACHINE && !hashmap_contains(h, ".host")) { |
5fc7f358 LP |
612 | _cleanup_(image_unrefp) Image *image = NULL; |
613 | ||
d577d4a4 | 614 | r = image_make(".host", AT_FDCWD, NULL, empty_to_root("/"), NULL, &image); |
5fc7f358 LP |
615 | if (r < 0) |
616 | return r; | |
617 | ||
cf604fd4 LP |
618 | image->discoverable = true; |
619 | ||
5fc7f358 LP |
620 | r = hashmap_put(h, image->name, image); |
621 | if (r < 0) | |
622 | return r; | |
623 | ||
624 | image = NULL; | |
5fc7f358 LP |
625 | } |
626 | ||
cd61c3bf LP |
627 | return 0; |
628 | } | |
629 | ||
08682124 | 630 | int image_remove(Image *i) { |
8e766630 | 631 | _cleanup_(release_lock_file) LockFile global_lock = LOCK_FILE_INIT, local_lock = LOCK_FILE_INIT; |
8e0b6570 | 632 | _cleanup_strv_free_ char **settings = NULL; |
bafbac4e | 633 | _cleanup_free_ char *roothash = NULL; |
8e0b6570 | 634 | char **j; |
30535c16 LP |
635 | int r; |
636 | ||
08682124 LP |
637 | assert(i); |
638 | ||
d94c2b06 | 639 | if (IMAGE_IS_VENDOR(i) || IMAGE_IS_HOST(i)) |
08682124 LP |
640 | return -EROFS; |
641 | ||
8e0b6570 LP |
642 | settings = image_settings_path(i); |
643 | if (!settings) | |
644 | return -ENOMEM; | |
645 | ||
bafbac4e LP |
646 | roothash = image_roothash_path(i); |
647 | if (!roothash) | |
648 | return -ENOMEM; | |
649 | ||
30535c16 LP |
650 | /* Make sure we don't interfere with a running nspawn */ |
651 | r = image_path_lock(i->path, LOCK_EX|LOCK_NB, &global_lock, &local_lock); | |
652 | if (r < 0) | |
653 | return r; | |
654 | ||
ebd93cb6 LP |
655 | switch (i->type) { |
656 | ||
657 | case IMAGE_SUBVOLUME: | |
9fb0b9c7 LP |
658 | |
659 | /* Let's unlink first, maybe it is a symlink? If that works we are happy. Otherwise, let's get out the | |
660 | * big guns */ | |
661 | if (unlink(i->path) < 0) { | |
662 | r = btrfs_subvol_remove(i->path, BTRFS_REMOVE_RECURSIVE|BTRFS_REMOVE_QUOTA); | |
663 | if (r < 0) | |
664 | return r; | |
665 | } | |
666 | ||
8e0b6570 | 667 | break; |
ebd93cb6 LP |
668 | |
669 | case IMAGE_DIRECTORY: | |
01b72568 | 670 | /* Allow deletion of read-only directories */ |
db9a4254 | 671 | (void) chattr_path(i->path, 0, FS_IMMUTABLE_FL, NULL); |
8e0b6570 LP |
672 | r = rm_rf(i->path, REMOVE_ROOT|REMOVE_PHYSICAL|REMOVE_SUBVOLUME); |
673 | if (r < 0) | |
674 | return r; | |
675 | ||
676 | break; | |
01b72568 | 677 | |
eb38edce LP |
678 | case IMAGE_BLOCK: |
679 | ||
680 | /* If this is inside of /dev, then it's a real block device, hence let's not touch the device node | |
681 | * itself (but let's remove the stuff stored alongside it). If it's anywhere else, let's try to unlink | |
682 | * the thing (it's most likely a symlink after all). */ | |
683 | ||
684 | if (path_startswith(i->path, "/dev")) | |
685 | break; | |
686 | ||
4831981d | 687 | _fallthrough_; |
aceac2f0 | 688 | case IMAGE_RAW: |
41d1ed05 LP |
689 | if (unlink(i->path) < 0) |
690 | return -errno; | |
8e0b6570 | 691 | break; |
ebd93cb6 LP |
692 | |
693 | default: | |
15411c0c | 694 | return -EOPNOTSUPP; |
ebd93cb6 | 695 | } |
8e0b6570 LP |
696 | |
697 | STRV_FOREACH(j, settings) { | |
698 | if (unlink(*j) < 0 && errno != ENOENT) | |
699 | log_debug_errno(errno, "Failed to unlink %s, ignoring: %m", *j); | |
700 | } | |
701 | ||
bafbac4e LP |
702 | if (unlink(roothash) < 0 && errno != ENOENT) |
703 | log_debug_errno(errno, "Failed to unlink %s, ignoring: %m", roothash); | |
704 | ||
8e0b6570 LP |
705 | return 0; |
706 | } | |
707 | ||
bafbac4e | 708 | static int rename_auxiliary_file(const char *path, const char *new_name, const char *suffix) { |
8e0b6570 LP |
709 | _cleanup_free_ char *rs = NULL; |
710 | const char *fn; | |
711 | ||
bafbac4e | 712 | fn = strjoina(new_name, suffix); |
8e0b6570 LP |
713 | |
714 | rs = file_in_same_dir(path, fn); | |
715 | if (!rs) | |
716 | return -ENOMEM; | |
717 | ||
718 | return rename_noreplace(AT_FDCWD, path, AT_FDCWD, rs); | |
ebd93cb6 LP |
719 | } |
720 | ||
721 | int image_rename(Image *i, const char *new_name) { | |
8e766630 | 722 | _cleanup_(release_lock_file) LockFile global_lock = LOCK_FILE_INIT, local_lock = LOCK_FILE_INIT, name_lock = LOCK_FILE_INIT; |
bafbac4e | 723 | _cleanup_free_ char *new_path = NULL, *nn = NULL, *roothash = NULL; |
8e0b6570 | 724 | _cleanup_strv_free_ char **settings = NULL; |
01b72568 | 725 | unsigned file_attr = 0; |
8e0b6570 | 726 | char **j; |
ebd93cb6 LP |
727 | int r; |
728 | ||
729 | assert(i); | |
730 | ||
731 | if (!image_name_is_valid(new_name)) | |
732 | return -EINVAL; | |
733 | ||
d94c2b06 | 734 | if (IMAGE_IS_VENDOR(i) || IMAGE_IS_HOST(i)) |
ebd93cb6 LP |
735 | return -EROFS; |
736 | ||
8e0b6570 LP |
737 | settings = image_settings_path(i); |
738 | if (!settings) | |
739 | return -ENOMEM; | |
740 | ||
bafbac4e LP |
741 | roothash = image_roothash_path(i); |
742 | if (!roothash) | |
743 | return -ENOMEM; | |
744 | ||
30535c16 LP |
745 | /* Make sure we don't interfere with a running nspawn */ |
746 | r = image_path_lock(i->path, LOCK_EX|LOCK_NB, &global_lock, &local_lock); | |
747 | if (r < 0) | |
748 | return r; | |
749 | ||
750 | /* Make sure nobody takes the new name, between the time we | |
751 | * checked it is currently unused in all search paths, and the | |
f8e2f4d6 | 752 | * time we take possession of it */ |
30535c16 LP |
753 | r = image_name_lock(new_name, LOCK_EX|LOCK_NB, &name_lock); |
754 | if (r < 0) | |
755 | return r; | |
756 | ||
d577d4a4 | 757 | r = image_find(IMAGE_MACHINE, new_name, NULL, NULL); |
3a6ce860 | 758 | if (r >= 0) |
ebd93cb6 | 759 | return -EEXIST; |
3a6ce860 LP |
760 | if (r != -ENOENT) |
761 | return r; | |
ebd93cb6 LP |
762 | |
763 | switch (i->type) { | |
764 | ||
ebd93cb6 | 765 | case IMAGE_DIRECTORY: |
01b72568 LP |
766 | /* Turn of the immutable bit while we rename the image, so that we can rename it */ |
767 | (void) read_attr_path(i->path, &file_attr); | |
768 | ||
769 | if (file_attr & FS_IMMUTABLE_FL) | |
db9a4254 | 770 | (void) chattr_path(i->path, 0, FS_IMMUTABLE_FL, NULL); |
01b72568 | 771 | |
4831981d | 772 | _fallthrough_; |
01b72568 | 773 | case IMAGE_SUBVOLUME: |
ebd93cb6 LP |
774 | new_path = file_in_same_dir(i->path, new_name); |
775 | break; | |
776 | ||
eb38edce LP |
777 | case IMAGE_BLOCK: |
778 | ||
779 | /* Refuse renaming raw block devices in /dev, the names are picked by udev after all. */ | |
780 | if (path_startswith(i->path, "/dev")) | |
781 | return -EROFS; | |
782 | ||
783 | new_path = file_in_same_dir(i->path, new_name); | |
784 | break; | |
785 | ||
aceac2f0 | 786 | case IMAGE_RAW: { |
ebd93cb6 LP |
787 | const char *fn; |
788 | ||
63c372cb | 789 | fn = strjoina(new_name, ".raw"); |
ebd93cb6 LP |
790 | new_path = file_in_same_dir(i->path, fn); |
791 | break; | |
792 | } | |
793 | ||
794 | default: | |
15411c0c | 795 | return -EOPNOTSUPP; |
ebd93cb6 LP |
796 | } |
797 | ||
798 | if (!new_path) | |
799 | return -ENOMEM; | |
800 | ||
801 | nn = strdup(new_name); | |
802 | if (!nn) | |
803 | return -ENOMEM; | |
804 | ||
f85ef957 AC |
805 | r = rename_noreplace(AT_FDCWD, i->path, AT_FDCWD, new_path); |
806 | if (r < 0) | |
807 | return r; | |
ebd93cb6 | 808 | |
01b72568 LP |
809 | /* Restore the immutable bit, if it was set before */ |
810 | if (file_attr & FS_IMMUTABLE_FL) | |
db9a4254 | 811 | (void) chattr_path(new_path, FS_IMMUTABLE_FL, FS_IMMUTABLE_FL, NULL); |
01b72568 | 812 | |
f9ecfd3b DL |
813 | free_and_replace(i->path, new_path); |
814 | free_and_replace(i->name, nn); | |
ebd93cb6 | 815 | |
8e0b6570 | 816 | STRV_FOREACH(j, settings) { |
bafbac4e | 817 | r = rename_auxiliary_file(*j, new_name, ".nspawn"); |
8e0b6570 LP |
818 | if (r < 0 && r != -ENOENT) |
819 | log_debug_errno(r, "Failed to rename settings file %s, ignoring: %m", *j); | |
820 | } | |
821 | ||
bafbac4e LP |
822 | r = rename_auxiliary_file(roothash, new_name, ".roothash"); |
823 | if (r < 0 && r != -ENOENT) | |
824 | log_debug_errno(r, "Failed to rename roothash file %s, ignoring: %m", roothash); | |
825 | ||
ebd93cb6 LP |
826 | return 0; |
827 | } | |
828 | ||
bafbac4e | 829 | static int clone_auxiliary_file(const char *path, const char *new_name, const char *suffix) { |
8e0b6570 LP |
830 | _cleanup_free_ char *rs = NULL; |
831 | const char *fn; | |
832 | ||
bafbac4e | 833 | fn = strjoina(new_name, suffix); |
8e0b6570 LP |
834 | |
835 | rs = file_in_same_dir(path, fn); | |
836 | if (!rs) | |
837 | return -ENOMEM; | |
838 | ||
8a016c74 | 839 | return copy_file_atomic(path, rs, 0664, 0, 0, COPY_REFLINK); |
8e0b6570 LP |
840 | } |
841 | ||
ebd93cb6 | 842 | int image_clone(Image *i, const char *new_name, bool read_only) { |
8e766630 | 843 | _cleanup_(release_lock_file) LockFile name_lock = LOCK_FILE_INIT; |
8e0b6570 | 844 | _cleanup_strv_free_ char **settings = NULL; |
bafbac4e | 845 | _cleanup_free_ char *roothash = NULL; |
ebd93cb6 | 846 | const char *new_path; |
8e0b6570 | 847 | char **j; |
ebd93cb6 LP |
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 LP |
984 | case IMAGE_BLOCK: { |
985 | _cleanup_close_ int fd = -1; | |
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) { | |
1153 | _cleanup_close_ int fd = -1; | |
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 { | |
1159 | r = id128_read_fd(fd, ID128_PLAIN, &machine_id); | |
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 | |
bcf94222 LB |
1180 | r = load_extension_release_pairs(i->path, i->name, &extension_release); |
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 | ||
e08f94ac | 1198 | r = loop_device_make_by_path(i->path, O_RDONLY, LO_FLAGS_PARTSCAN, &d); |
c7664c07 LP |
1199 | if (r < 0) |
1200 | return r; | |
1201 | ||
89e62e0b | 1202 | r = dissect_image(d->fd, NULL, NULL, DISSECT_IMAGE_REQUIRE_ROOT|DISSECT_IMAGE_RELAX_VAR_CHECK, &m); |
c7664c07 LP |
1203 | if (r < 0) |
1204 | return r; | |
1205 | ||
1206 | r = dissected_image_acquire_metadata(m); | |
1207 | if (r < 0) | |
1208 | return r; | |
1209 | ||
1210 | free_and_replace(i->hostname, m->hostname); | |
1211 | i->machine_id = m->machine_id; | |
1212 | strv_free_and_replace(i->machine_info, m->machine_info); | |
1213 | strv_free_and_replace(i->os_release, m->os_release); | |
bcf94222 | 1214 | strv_free_and_replace(i->extension_release, m->extension_release); |
c7664c07 LP |
1215 | |
1216 | break; | |
1217 | } | |
1218 | ||
1219 | default: | |
1220 | return -EOPNOTSUPP; | |
1221 | } | |
1222 | ||
1223 | i->metadata_valid = true; | |
1224 | ||
1225 | return 0; | |
1226 | } | |
1227 | ||
30535c16 | 1228 | int image_name_lock(const char *name, int operation, LockFile *ret) { |
99d97afc LP |
1229 | const char *p; |
1230 | ||
30535c16 LP |
1231 | assert(name); |
1232 | assert(ret); | |
1233 | ||
1234 | /* Locks an image name, regardless of the precise path used. */ | |
1235 | ||
99d97afc LP |
1236 | if (streq(name, ".host")) |
1237 | return -EBUSY; | |
1238 | ||
30535c16 LP |
1239 | if (!image_name_is_valid(name)) |
1240 | return -EINVAL; | |
1241 | ||
b6e953f2 LP |
1242 | if (getenv_bool("SYSTEMD_NSPAWN_LOCK") == 0) { |
1243 | *ret = (LockFile) LOCK_FILE_INIT; | |
1244 | return 0; | |
1245 | } | |
1246 | ||
6e5dcce4 | 1247 | (void) mkdir_p("/run/systemd/nspawn/locks", 0700); |
99d97afc LP |
1248 | |
1249 | p = strjoina("/run/systemd/nspawn/locks/name-", name); | |
30535c16 LP |
1250 | return make_lock_file(p, operation, ret); |
1251 | } | |
1252 | ||
d577d4a4 LP |
1253 | bool image_in_search_path( |
1254 | ImageClass class, | |
1255 | const char *root, | |
1256 | const char *image) { | |
1257 | ||
ace9ab19 LP |
1258 | const char *path; |
1259 | ||
1260 | assert(image); | |
1261 | ||
1262 | NULSTR_FOREACH(path, image_search_path[class]) { | |
d577d4a4 | 1263 | const char *p, *q; |
ace9ab19 LP |
1264 | size_t k; |
1265 | ||
d577d4a4 LP |
1266 | if (!empty_or_root(root)) { |
1267 | q = path_startswith(path, root); | |
1268 | if (!q) | |
1269 | continue; | |
1270 | } else | |
1271 | q = path; | |
1272 | ||
1273 | p = path_startswith(q, path); | |
ace9ab19 LP |
1274 | if (!p) |
1275 | continue; | |
1276 | ||
1277 | /* Make sure there's a filename following */ | |
1278 | k = strcspn(p, "/"); | |
1279 | if (k == 0) | |
1280 | continue; | |
1281 | ||
1282 | p += k; | |
1283 | ||
1284 | /* Accept trailing slashes */ | |
1285 | if (p[strspn(p, "/")] == 0) | |
1286 | return true; | |
1287 | ||
1288 | } | |
1289 | ||
1290 | return false; | |
1291 | } | |
1292 | ||
cd61c3bf LP |
1293 | static const char* const image_type_table[_IMAGE_TYPE_MAX] = { |
1294 | [IMAGE_DIRECTORY] = "directory", | |
1295 | [IMAGE_SUBVOLUME] = "subvolume", | |
aceac2f0 | 1296 | [IMAGE_RAW] = "raw", |
eb38edce | 1297 | [IMAGE_BLOCK] = "block", |
cd61c3bf LP |
1298 | }; |
1299 | ||
1300 | DEFINE_STRING_TABLE_LOOKUP(image_type, ImageType); |