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Commit | Line | Data |
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53e1b683 | 1 | /* SPDX-License-Identifier: LGPL-2.1+ */ |
cd61c3bf | 2 | |
a8fbdf54 TA |
3 | #include <dirent.h> |
4 | #include <errno.h> | |
ebd93cb6 | 5 | #include <fcntl.h> |
a8fbdf54 TA |
6 | #include <stdio.h> |
7 | #include <stdlib.h> | |
8 | #include <string.h> | |
e306723e | 9 | #include <sys/file.h> |
204f52e3 | 10 | #include <sys/ioctl.h> |
a8fbdf54 TA |
11 | #include <sys/stat.h> |
12 | #include <unistd.h> | |
8e0b6570 | 13 | #include <linux/fs.h> |
546dbec5 | 14 | |
b5efdb8a | 15 | #include "alloc-util.h" |
cd61c3bf | 16 | #include "btrfs-util.h" |
c8b3094d | 17 | #include "chattr-util.h" |
ebd93cb6 | 18 | #include "copy.h" |
a0956174 | 19 | #include "dirent-util.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" |
c7664c07 LP |
26 | #include "hostname-util.h" |
27 | #include "id128-util.h" | |
a8fbdf54 TA |
28 | #include "lockfile-util.h" |
29 | #include "log.h" | |
c7664c07 | 30 | #include "loop-util.h" |
3ffd4af2 | 31 | #include "machine-image.h" |
546dbec5 | 32 | #include "macro.h" |
30535c16 | 33 | #include "mkdir.h" |
d8b4d14d | 34 | #include "nulstr-util.h" |
d58ad743 | 35 | #include "os-util.h" |
8e0b6570 | 36 | #include "path-util.h" |
c6878637 | 37 | #include "rm-rf.h" |
8b43440b | 38 | #include "string-table.h" |
07630cea | 39 | #include "string-util.h" |
8e0b6570 | 40 | #include "strv.h" |
a8fbdf54 | 41 | #include "time-util.h" |
8e0b6570 | 42 | #include "utf8.h" |
89a5a90c | 43 | #include "xattr-util.h" |
cd61c3bf | 44 | |
5ef46e5f | 45 | static const char* const image_search_path[_IMAGE_CLASS_MAX] = { |
ace9ab19 LP |
46 | [IMAGE_MACHINE] = "/etc/machines\0" /* only place symlinks here */ |
47 | "/run/machines\0" /* and here too */ | |
48 | "/var/lib/machines\0" /* the main place for images */ | |
49 | "/var/lib/container\0" /* legacy */ | |
5ef46e5f LP |
50 | "/usr/local/lib/machines\0" |
51 | "/usr/lib/machines\0", | |
52 | ||
ace9ab19 LP |
53 | [IMAGE_PORTABLE] = "/etc/portables\0" /* only place symlinks here */ |
54 | "/run/portables\0" /* and here too */ | |
55 | "/var/lib/portables\0" /* the main place for images */ | |
5ef46e5f LP |
56 | "/usr/local/lib/portables\0" |
57 | "/usr/lib/portables\0", | |
58 | }; | |
c2ce6a3d | 59 | |
8301aa0b YW |
60 | static Image *image_free(Image *i) { |
61 | assert(i); | |
9614bb06 | 62 | |
cd61c3bf LP |
63 | free(i->name); |
64 | free(i->path); | |
c7664c07 LP |
65 | |
66 | free(i->hostname); | |
67 | strv_free(i->machine_info); | |
68 | strv_free(i->os_release); | |
69 | ||
6b430fdb | 70 | return mfree(i); |
cd61c3bf LP |
71 | } |
72 | ||
8301aa0b | 73 | DEFINE_TRIVIAL_REF_UNREF_FUNC(Image, image, image_free); |
b07ec5a1 YW |
74 | DEFINE_HASH_OPS_WITH_VALUE_DESTRUCTOR(image_hash_ops, char, string_hash_func, string_compare_func, |
75 | Image, image_unref); | |
9614bb06 | 76 | |
8e0b6570 LP |
77 | static char **image_settings_path(Image *image) { |
78 | _cleanup_strv_free_ char **l = NULL; | |
8e0b6570 LP |
79 | const char *fn, *s; |
80 | unsigned i = 0; | |
81 | ||
82 | assert(image); | |
83 | ||
84 | l = new0(char*, 4); | |
85 | if (!l) | |
86 | return NULL; | |
87 | ||
88 | fn = strjoina(image->name, ".nspawn"); | |
89 | ||
90 | FOREACH_STRING(s, "/etc/systemd/nspawn/", "/run/systemd/nspawn/") { | |
91 | l[i] = strappend(s, fn); | |
92 | if (!l[i]) | |
93 | return NULL; | |
94 | ||
95 | i++; | |
96 | } | |
97 | ||
98 | l[i] = file_in_same_dir(image->path, fn); | |
99 | if (!l[i]) | |
100 | return NULL; | |
101 | ||
ae2a15bc | 102 | return TAKE_PTR(l); |
8e0b6570 LP |
103 | } |
104 | ||
bafbac4e LP |
105 | static char *image_roothash_path(Image *image) { |
106 | const char *fn; | |
107 | ||
108 | assert(image); | |
109 | ||
110 | fn = strjoina(image->name, ".roothash"); | |
111 | ||
112 | return file_in_same_dir(image->path, fn); | |
113 | } | |
114 | ||
c2ce6a3d | 115 | static int image_new( |
cd61c3bf | 116 | ImageType t, |
5fc7f358 | 117 | const char *pretty, |
cd61c3bf | 118 | const char *path, |
5fc7f358 | 119 | const char *filename, |
cd61c3bf | 120 | bool read_only, |
10f9c755 | 121 | usec_t crtime, |
cd61c3bf | 122 | usec_t mtime, |
c2ce6a3d | 123 | Image **ret) { |
cd61c3bf LP |
124 | |
125 | _cleanup_(image_unrefp) Image *i = NULL; | |
cd61c3bf | 126 | |
cd61c3bf LP |
127 | assert(t >= 0); |
128 | assert(t < _IMAGE_TYPE_MAX); | |
5fc7f358 LP |
129 | assert(pretty); |
130 | assert(filename); | |
c2ce6a3d | 131 | assert(ret); |
cd61c3bf | 132 | |
c2ce6a3d | 133 | i = new0(Image, 1); |
cd61c3bf LP |
134 | if (!i) |
135 | return -ENOMEM; | |
136 | ||
9614bb06 | 137 | i->n_ref = 1; |
cd61c3bf LP |
138 | i->type = t; |
139 | i->read_only = read_only; | |
10f9c755 | 140 | i->crtime = crtime; |
cd61c3bf | 141 | i->mtime = mtime; |
c19de711 | 142 | i->usage = i->usage_exclusive = (uint64_t) -1; |
b6b18498 | 143 | i->limit = i->limit_exclusive = (uint64_t) -1; |
cd61c3bf | 144 | |
5fc7f358 | 145 | i->name = strdup(pretty); |
cd61c3bf LP |
146 | if (!i->name) |
147 | return -ENOMEM; | |
148 | ||
5fc7f358 | 149 | if (path) |
605405c6 | 150 | i->path = strjoin(path, "/", filename); |
5fc7f358 LP |
151 | else |
152 | i->path = strdup(filename); | |
5fc7f358 LP |
153 | if (!i->path) |
154 | return -ENOMEM; | |
155 | ||
858d36c1 | 156 | path_simplify(i->path, false); |
cd61c3bf | 157 | |
1cc6c93a | 158 | *ret = TAKE_PTR(i); |
c2ce6a3d | 159 | |
cd61c3bf LP |
160 | return 0; |
161 | } | |
162 | ||
4756c94e LP |
163 | static int extract_pretty(const char *path, const char *suffix, char **ret) { |
164 | _cleanup_free_ char *name = NULL; | |
165 | const char *p; | |
166 | size_t n; | |
167 | ||
168 | assert(path); | |
169 | assert(ret); | |
170 | ||
171 | p = last_path_component(path); | |
172 | n = strcspn(p, "/"); | |
173 | ||
174 | name = strndup(p, n); | |
175 | if (!name) | |
176 | return -ENOMEM; | |
177 | ||
178 | if (suffix) { | |
179 | char *e; | |
180 | ||
181 | e = endswith(name, suffix); | |
182 | if (!e) | |
183 | return -EINVAL; | |
184 | ||
185 | *e = 0; | |
186 | } | |
187 | ||
188 | if (!image_name_is_valid(name)) | |
189 | return -EINVAL; | |
190 | ||
191 | *ret = TAKE_PTR(name); | |
192 | return 0; | |
193 | } | |
194 | ||
5fc7f358 LP |
195 | static int image_make( |
196 | const char *pretty, | |
197 | int dfd, | |
198 | const char *path, | |
199 | const char *filename, | |
3a6ce860 | 200 | const struct stat *st, |
5fc7f358 LP |
201 | Image **ret) { |
202 | ||
4756c94e | 203 | _cleanup_free_ char *pretty_buffer = NULL; |
3a6ce860 | 204 | struct stat stbuf; |
5fc7f358 | 205 | bool read_only; |
cd61c3bf LP |
206 | int r; |
207 | ||
3a6ce860 | 208 | assert(dfd >= 0 || dfd == AT_FDCWD); |
5fc7f358 | 209 | assert(filename); |
cd61c3bf | 210 | |
eb38edce | 211 | /* We explicitly *do* follow symlinks here, since we want to allow symlinking trees, raw files and block |
3a6ce860 LP |
212 | * devices into /var/lib/machines/, and treat them normally. |
213 | * | |
214 | * This function returns -ENOENT if we can't find the image after all, and -EMEDIUMTYPE if it's not a file we | |
215 | * recognize. */ | |
cd61c3bf | 216 | |
3a6ce860 LP |
217 | if (!st) { |
218 | if (fstatat(dfd, filename, &stbuf, 0) < 0) | |
219 | return -errno; | |
220 | ||
221 | st = &stbuf; | |
222 | } | |
cd61c3bf | 223 | |
5fc7f358 LP |
224 | read_only = |
225 | (path && path_startswith(path, "/usr")) || | |
08ff5529 | 226 | (faccessat(dfd, filename, W_OK, AT_EACCESS) < 0 && errno == EROFS); |
86e339c8 | 227 | |
3a6ce860 | 228 | if (S_ISDIR(st->st_mode)) { |
01b72568 LP |
229 | _cleanup_close_ int fd = -1; |
230 | unsigned file_attr = 0; | |
cd61c3bf | 231 | |
c2ce6a3d | 232 | if (!ret) |
3a6ce860 | 233 | return 0; |
cd61c3bf | 234 | |
4756c94e LP |
235 | if (!pretty) { |
236 | r = extract_pretty(filename, NULL, &pretty_buffer); | |
237 | if (r < 0) | |
238 | return r; | |
239 | ||
240 | pretty = pretty_buffer; | |
241 | } | |
5fc7f358 | 242 | |
01b72568 LP |
243 | fd = openat(dfd, filename, O_CLOEXEC|O_NOCTTY|O_DIRECTORY); |
244 | if (fd < 0) | |
245 | return -errno; | |
246 | ||
c2ce6a3d | 247 | /* btrfs subvolumes have inode 256 */ |
3a6ce860 | 248 | if (st->st_ino == 256) { |
cd61c3bf | 249 | |
21222ea5 LP |
250 | r = btrfs_is_filesystem(fd); |
251 | if (r < 0) | |
252 | return r; | |
253 | if (r) { | |
10f9c755 | 254 | BtrfsSubvolInfo info; |
cd61c3bf | 255 | |
c2ce6a3d | 256 | /* It's a btrfs subvolume */ |
cd61c3bf | 257 | |
5bcd08db | 258 | r = btrfs_subvol_get_info_fd(fd, 0, &info); |
10f9c755 LP |
259 | if (r < 0) |
260 | return r; | |
c2ce6a3d LP |
261 | |
262 | r = image_new(IMAGE_SUBVOLUME, | |
5fc7f358 | 263 | pretty, |
c2ce6a3d | 264 | path, |
5fc7f358 LP |
265 | filename, |
266 | info.read_only || read_only, | |
10f9c755 | 267 | info.otime, |
c2ce6a3d | 268 | 0, |
c2ce6a3d LP |
269 | ret); |
270 | if (r < 0) | |
271 | return r; | |
272 | ||
5bcd08db LP |
273 | if (btrfs_quota_scan_ongoing(fd) == 0) { |
274 | BtrfsQuotaInfo quota; | |
b6b18498 | 275 | |
5bcd08db LP |
276 | r = btrfs_subvol_get_subtree_quota_fd(fd, 0, "a); |
277 | if (r >= 0) { | |
278 | (*ret)->usage = quota.referenced; | |
279 | (*ret)->usage_exclusive = quota.exclusive; | |
280 | ||
281 | (*ret)->limit = quota.referenced_max; | |
282 | (*ret)->limit_exclusive = quota.exclusive_max; | |
283 | } | |
b6b18498 LP |
284 | } |
285 | ||
3a6ce860 | 286 | return 0; |
cd61c3bf | 287 | } |
c2ce6a3d | 288 | } |
cd61c3bf | 289 | |
01b72568 LP |
290 | /* If the IMMUTABLE bit is set, we consider the |
291 | * directory read-only. Since the ioctl is not | |
292 | * supported everywhere we ignore failures. */ | |
293 | (void) read_attr_fd(fd, &file_attr); | |
cd61c3bf | 294 | |
01b72568 | 295 | /* It's just a normal directory. */ |
c2ce6a3d | 296 | r = image_new(IMAGE_DIRECTORY, |
5fc7f358 | 297 | pretty, |
c2ce6a3d | 298 | path, |
5fc7f358 | 299 | filename, |
01b72568 | 300 | read_only || (file_attr & FS_IMMUTABLE_FL), |
c2ce6a3d LP |
301 | 0, |
302 | 0, | |
303 | ret); | |
304 | if (r < 0) | |
305 | return r; | |
cd61c3bf | 306 | |
3a6ce860 | 307 | return 0; |
cd61c3bf | 308 | |
3a6ce860 | 309 | } else if (S_ISREG(st->st_mode) && endswith(filename, ".raw")) { |
10f9c755 | 310 | usec_t crtime = 0; |
cd61c3bf | 311 | |
aceac2f0 | 312 | /* It's a RAW disk image */ |
cd61c3bf | 313 | |
c2ce6a3d | 314 | if (!ret) |
3a6ce860 | 315 | return 0; |
cd61c3bf | 316 | |
4756c94e | 317 | (void) fd_getcrtime_at(dfd, filename, &crtime, 0); |
10f9c755 | 318 | |
4756c94e LP |
319 | if (!pretty) { |
320 | r = extract_pretty(filename, ".raw", &pretty_buffer); | |
321 | if (r < 0) | |
322 | return r; | |
323 | ||
324 | pretty = pretty_buffer; | |
325 | } | |
10f9c755 | 326 | |
aceac2f0 | 327 | r = image_new(IMAGE_RAW, |
5fc7f358 | 328 | pretty, |
c2ce6a3d | 329 | path, |
5fc7f358 | 330 | filename, |
3a6ce860 | 331 | !(st->st_mode & 0222) || read_only, |
10f9c755 | 332 | crtime, |
3a6ce860 | 333 | timespec_load(&st->st_mtim), |
c2ce6a3d LP |
334 | ret); |
335 | if (r < 0) | |
336 | return r; | |
cd61c3bf | 337 | |
3a6ce860 LP |
338 | (*ret)->usage = (*ret)->usage_exclusive = st->st_blocks * 512; |
339 | (*ret)->limit = (*ret)->limit_exclusive = st->st_size; | |
b6b18498 | 340 | |
3a6ce860 | 341 | return 0; |
eb38edce | 342 | |
3a6ce860 | 343 | } else if (S_ISBLK(st->st_mode)) { |
eb38edce LP |
344 | _cleanup_close_ int block_fd = -1; |
345 | uint64_t size = UINT64_MAX; | |
346 | ||
347 | /* A block device */ | |
348 | ||
349 | if (!ret) | |
3a6ce860 | 350 | return 0; |
eb38edce | 351 | |
4756c94e LP |
352 | if (!pretty) { |
353 | r = extract_pretty(filename, NULL, &pretty_buffer); | |
354 | if (r < 0) | |
355 | return r; | |
356 | ||
357 | pretty = pretty_buffer; | |
358 | } | |
eb38edce LP |
359 | |
360 | block_fd = openat(dfd, filename, O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_NOCTTY); | |
361 | if (block_fd < 0) | |
362 | log_debug_errno(errno, "Failed to open block device %s/%s, ignoring: %m", path, filename); | |
363 | else { | |
3a6ce860 LP |
364 | /* Refresh stat data after opening the node */ |
365 | if (fstat(block_fd, &stbuf) < 0) | |
eb38edce | 366 | return -errno; |
3a6ce860 LP |
367 | st = &stbuf; |
368 | ||
369 | if (!S_ISBLK(st->st_mode)) /* Verify that what we opened is actually what we think it is */ | |
eb38edce LP |
370 | return -ENOTTY; |
371 | ||
372 | if (!read_only) { | |
373 | int state = 0; | |
374 | ||
375 | if (ioctl(block_fd, BLKROGET, &state) < 0) | |
376 | log_debug_errno(errno, "Failed to issue BLKROGET on device %s/%s, ignoring: %m", path, filename); | |
377 | else if (state) | |
378 | read_only = true; | |
379 | } | |
380 | ||
381 | if (ioctl(block_fd, BLKGETSIZE64, &size) < 0) | |
4c2e654b | 382 | log_debug_errno(errno, "Failed to issue BLKGETSIZE64 on device %s/%s, ignoring: %m", path, filename); |
eb38edce LP |
383 | |
384 | block_fd = safe_close(block_fd); | |
385 | } | |
386 | ||
387 | r = image_new(IMAGE_BLOCK, | |
388 | pretty, | |
389 | path, | |
390 | filename, | |
3a6ce860 | 391 | !(st->st_mode & 0222) || read_only, |
eb38edce LP |
392 | 0, |
393 | 0, | |
394 | ret); | |
395 | if (r < 0) | |
396 | return r; | |
397 | ||
ed0cb346 | 398 | if (!IN_SET(size, 0, UINT64_MAX)) |
eb38edce LP |
399 | (*ret)->usage = (*ret)->usage_exclusive = (*ret)->limit = (*ret)->limit_exclusive = size; |
400 | ||
3a6ce860 | 401 | return 0; |
c2ce6a3d | 402 | } |
cd61c3bf | 403 | |
3a6ce860 | 404 | return -EMEDIUMTYPE; |
c2ce6a3d | 405 | } |
cd61c3bf | 406 | |
5ef46e5f | 407 | int image_find(ImageClass class, const char *name, Image **ret) { |
c2ce6a3d LP |
408 | const char *path; |
409 | int r; | |
cd61c3bf | 410 | |
5ef46e5f LP |
411 | assert(class >= 0); |
412 | assert(class < _IMAGE_CLASS_MAX); | |
c2ce6a3d | 413 | assert(name); |
cd61c3bf | 414 | |
c2ce6a3d LP |
415 | /* There are no images with invalid names */ |
416 | if (!image_name_is_valid(name)) | |
3a6ce860 | 417 | return -ENOENT; |
cd61c3bf | 418 | |
5ef46e5f | 419 | NULSTR_FOREACH(path, image_search_path[class]) { |
c2ce6a3d | 420 | _cleanup_closedir_ DIR *d = NULL; |
3a6ce860 | 421 | struct stat st; |
cd61c3bf | 422 | |
c2ce6a3d LP |
423 | d = opendir(path); |
424 | if (!d) { | |
425 | if (errno == ENOENT) | |
426 | continue; | |
cd61c3bf | 427 | |
c2ce6a3d LP |
428 | return -errno; |
429 | } | |
cd61c3bf | 430 | |
3a6ce860 LP |
431 | /* As mentioned above, we follow symlinks on this fstatat(), because we want to permit people to |
432 | * symlink block devices into the search path */ | |
433 | if (fstatat(dirfd(d), name, &st, 0) < 0) { | |
aceac2f0 | 434 | _cleanup_free_ char *raw = NULL; |
5fc7f358 | 435 | |
3a6ce860 LP |
436 | if (errno != ENOENT) |
437 | return -errno; | |
438 | ||
aceac2f0 LP |
439 | raw = strappend(name, ".raw"); |
440 | if (!raw) | |
5fc7f358 LP |
441 | return -ENOMEM; |
442 | ||
3a6ce860 LP |
443 | if (fstatat(dirfd(d), raw, &st, 0) < 0) { |
444 | ||
445 | if (errno == ENOENT) | |
446 | continue; | |
447 | ||
448 | return -errno; | |
449 | } | |
450 | ||
451 | if (!S_ISREG(st.st_mode)) | |
5fc7f358 | 452 | continue; |
3a6ce860 LP |
453 | |
454 | r = image_make(name, dirfd(d), path, raw, &st, ret); | |
455 | ||
456 | } else { | |
457 | if (!S_ISDIR(st.st_mode) && !S_ISBLK(st.st_mode)) | |
458 | continue; | |
459 | ||
460 | r = image_make(name, dirfd(d), path, name, &st, ret); | |
5fc7f358 | 461 | } |
3a6ce860 LP |
462 | if (IN_SET(r, -ENOENT, -EMEDIUMTYPE)) |
463 | continue; | |
c2ce6a3d LP |
464 | if (r < 0) |
465 | return r; | |
cd61c3bf | 466 | |
cf604fd4 LP |
467 | if (ret) |
468 | (*ret)->discoverable = true; | |
469 | ||
c2ce6a3d LP |
470 | return 1; |
471 | } | |
472 | ||
cf604fd4 LP |
473 | if (class == IMAGE_MACHINE && streq(name, ".host")) { |
474 | r = image_make(".host", AT_FDCWD, NULL, "/", NULL, ret); | |
475 | if (r < 0) | |
476 | return r; | |
477 | ||
478 | if (ret) | |
479 | (*ret)->discoverable = true; | |
480 | ||
481 | return r; | |
482 | } | |
5fc7f358 | 483 | |
3a6ce860 | 484 | return -ENOENT; |
c2ce6a3d LP |
485 | }; |
486 | ||
2ddf182b | 487 | int image_from_path(const char *path, Image **ret) { |
cf604fd4 LP |
488 | |
489 | /* Note that we don't set the 'discoverable' field of the returned object, because we don't check here whether | |
490 | * 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 | 491 | * overridden by another, different image earlier in the search path */ |
cf604fd4 | 492 | |
2ddf182b LP |
493 | if (path_equal(path, "/")) |
494 | return image_make(".host", AT_FDCWD, NULL, "/", NULL, ret); | |
495 | ||
496 | return image_make(NULL, AT_FDCWD, NULL, path, NULL, ret); | |
497 | } | |
498 | ||
499 | int image_find_harder(ImageClass class, const char *name_or_path, Image **ret) { | |
500 | if (image_name_is_valid(name_or_path)) | |
501 | return image_find(class, name_or_path, ret); | |
502 | ||
503 | return image_from_path(name_or_path, ret); | |
504 | } | |
505 | ||
5ef46e5f | 506 | int image_discover(ImageClass class, Hashmap *h) { |
c2ce6a3d LP |
507 | const char *path; |
508 | int r; | |
509 | ||
5ef46e5f LP |
510 | assert(class >= 0); |
511 | assert(class < _IMAGE_CLASS_MAX); | |
c2ce6a3d LP |
512 | assert(h); |
513 | ||
5ef46e5f | 514 | NULSTR_FOREACH(path, image_search_path[class]) { |
c2ce6a3d LP |
515 | _cleanup_closedir_ DIR *d = NULL; |
516 | struct dirent *de; | |
517 | ||
518 | d = opendir(path); | |
519 | if (!d) { | |
520 | if (errno == ENOENT) | |
a67a4c8c | 521 | continue; |
c2ce6a3d LP |
522 | |
523 | return -errno; | |
524 | } | |
525 | ||
526 | FOREACH_DIRENT_ALL(de, d, return -errno) { | |
527 | _cleanup_(image_unrefp) Image *image = NULL; | |
1bf36bf9 | 528 | _cleanup_free_ char *truncated = NULL; |
3a6ce860 LP |
529 | const char *pretty; |
530 | struct stat st; | |
c2ce6a3d | 531 | |
1bf36bf9 | 532 | if (dot_or_dot_dot(de->d_name)) |
c2ce6a3d LP |
533 | continue; |
534 | ||
3a6ce860 LP |
535 | /* As mentioned above, we follow symlinks on this fstatat(), because we want to permit people |
536 | * to symlink block devices into the search path */ | |
537 | if (fstatat(dirfd(d), de->d_name, &st, 0) < 0) { | |
538 | if (errno == ENOENT) | |
539 | continue; | |
540 | ||
541 | return -errno; | |
542 | } | |
543 | ||
544 | if (S_ISREG(st.st_mode)) { | |
545 | const char *e; | |
546 | ||
547 | e = endswith(de->d_name, ".raw"); | |
548 | if (!e) | |
549 | continue; | |
550 | ||
1bf36bf9 LP |
551 | truncated = strndup(de->d_name, e - de->d_name); |
552 | if (!truncated) | |
553 | return -ENOMEM; | |
554 | ||
555 | pretty = truncated; | |
3a6ce860 | 556 | } else if (S_ISDIR(st.st_mode) || S_ISBLK(st.st_mode)) |
1bf36bf9 | 557 | pretty = de->d_name; |
3a6ce860 LP |
558 | else |
559 | continue; | |
1bf36bf9 LP |
560 | |
561 | if (!image_name_is_valid(pretty)) | |
562 | continue; | |
563 | ||
564 | if (hashmap_contains(h, pretty)) | |
c2ce6a3d LP |
565 | continue; |
566 | ||
3a6ce860 LP |
567 | r = image_make(pretty, dirfd(d), path, de->d_name, &st, &image); |
568 | if (IN_SET(r, -ENOENT, -EMEDIUMTYPE)) | |
c2ce6a3d LP |
569 | continue; |
570 | if (r < 0) | |
571 | return r; | |
572 | ||
cf604fd4 LP |
573 | image->discoverable = true; |
574 | ||
c2ce6a3d LP |
575 | r = hashmap_put(h, image->name, image); |
576 | if (r < 0) | |
577 | return r; | |
578 | ||
579 | image = NULL; | |
cd61c3bf LP |
580 | } |
581 | } | |
582 | ||
5ef46e5f | 583 | if (class == IMAGE_MACHINE && !hashmap_contains(h, ".host")) { |
5fc7f358 LP |
584 | _cleanup_(image_unrefp) Image *image = NULL; |
585 | ||
3a6ce860 | 586 | r = image_make(".host", AT_FDCWD, NULL, "/", NULL, &image); |
5fc7f358 LP |
587 | if (r < 0) |
588 | return r; | |
589 | ||
cf604fd4 LP |
590 | image->discoverable = true; |
591 | ||
5fc7f358 LP |
592 | r = hashmap_put(h, image->name, image); |
593 | if (r < 0) | |
594 | return r; | |
595 | ||
596 | image = NULL; | |
5fc7f358 LP |
597 | } |
598 | ||
cd61c3bf LP |
599 | return 0; |
600 | } | |
601 | ||
08682124 | 602 | int image_remove(Image *i) { |
8e766630 | 603 | _cleanup_(release_lock_file) LockFile global_lock = LOCK_FILE_INIT, local_lock = LOCK_FILE_INIT; |
8e0b6570 | 604 | _cleanup_strv_free_ char **settings = NULL; |
bafbac4e | 605 | _cleanup_free_ char *roothash = NULL; |
8e0b6570 | 606 | char **j; |
30535c16 LP |
607 | int r; |
608 | ||
08682124 LP |
609 | assert(i); |
610 | ||
d94c2b06 | 611 | if (IMAGE_IS_VENDOR(i) || IMAGE_IS_HOST(i)) |
08682124 LP |
612 | return -EROFS; |
613 | ||
8e0b6570 LP |
614 | settings = image_settings_path(i); |
615 | if (!settings) | |
616 | return -ENOMEM; | |
617 | ||
bafbac4e LP |
618 | roothash = image_roothash_path(i); |
619 | if (!roothash) | |
620 | return -ENOMEM; | |
621 | ||
30535c16 LP |
622 | /* Make sure we don't interfere with a running nspawn */ |
623 | r = image_path_lock(i->path, LOCK_EX|LOCK_NB, &global_lock, &local_lock); | |
624 | if (r < 0) | |
625 | return r; | |
626 | ||
ebd93cb6 LP |
627 | switch (i->type) { |
628 | ||
629 | case IMAGE_SUBVOLUME: | |
9fb0b9c7 LP |
630 | |
631 | /* Let's unlink first, maybe it is a symlink? If that works we are happy. Otherwise, let's get out the | |
632 | * big guns */ | |
633 | if (unlink(i->path) < 0) { | |
634 | r = btrfs_subvol_remove(i->path, BTRFS_REMOVE_RECURSIVE|BTRFS_REMOVE_QUOTA); | |
635 | if (r < 0) | |
636 | return r; | |
637 | } | |
638 | ||
8e0b6570 | 639 | break; |
ebd93cb6 LP |
640 | |
641 | case IMAGE_DIRECTORY: | |
01b72568 | 642 | /* Allow deletion of read-only directories */ |
db9a4254 | 643 | (void) chattr_path(i->path, 0, FS_IMMUTABLE_FL, NULL); |
8e0b6570 LP |
644 | r = rm_rf(i->path, REMOVE_ROOT|REMOVE_PHYSICAL|REMOVE_SUBVOLUME); |
645 | if (r < 0) | |
646 | return r; | |
647 | ||
648 | break; | |
01b72568 | 649 | |
eb38edce LP |
650 | case IMAGE_BLOCK: |
651 | ||
652 | /* If this is inside of /dev, then it's a real block device, hence let's not touch the device node | |
653 | * itself (but let's remove the stuff stored alongside it). If it's anywhere else, let's try to unlink | |
654 | * the thing (it's most likely a symlink after all). */ | |
655 | ||
656 | if (path_startswith(i->path, "/dev")) | |
657 | break; | |
658 | ||
4831981d | 659 | _fallthrough_; |
aceac2f0 | 660 | case IMAGE_RAW: |
41d1ed05 LP |
661 | if (unlink(i->path) < 0) |
662 | return -errno; | |
8e0b6570 | 663 | break; |
ebd93cb6 LP |
664 | |
665 | default: | |
15411c0c | 666 | return -EOPNOTSUPP; |
ebd93cb6 | 667 | } |
8e0b6570 LP |
668 | |
669 | STRV_FOREACH(j, settings) { | |
670 | if (unlink(*j) < 0 && errno != ENOENT) | |
671 | log_debug_errno(errno, "Failed to unlink %s, ignoring: %m", *j); | |
672 | } | |
673 | ||
bafbac4e LP |
674 | if (unlink(roothash) < 0 && errno != ENOENT) |
675 | log_debug_errno(errno, "Failed to unlink %s, ignoring: %m", roothash); | |
676 | ||
8e0b6570 LP |
677 | return 0; |
678 | } | |
679 | ||
bafbac4e | 680 | static int rename_auxiliary_file(const char *path, const char *new_name, const char *suffix) { |
8e0b6570 LP |
681 | _cleanup_free_ char *rs = NULL; |
682 | const char *fn; | |
683 | ||
bafbac4e | 684 | fn = strjoina(new_name, suffix); |
8e0b6570 LP |
685 | |
686 | rs = file_in_same_dir(path, fn); | |
687 | if (!rs) | |
688 | return -ENOMEM; | |
689 | ||
690 | return rename_noreplace(AT_FDCWD, path, AT_FDCWD, rs); | |
ebd93cb6 LP |
691 | } |
692 | ||
693 | int image_rename(Image *i, const char *new_name) { | |
8e766630 | 694 | _cleanup_(release_lock_file) LockFile global_lock = LOCK_FILE_INIT, local_lock = LOCK_FILE_INIT, name_lock = LOCK_FILE_INIT; |
bafbac4e | 695 | _cleanup_free_ char *new_path = NULL, *nn = NULL, *roothash = NULL; |
8e0b6570 | 696 | _cleanup_strv_free_ char **settings = NULL; |
01b72568 | 697 | unsigned file_attr = 0; |
8e0b6570 | 698 | char **j; |
ebd93cb6 LP |
699 | int r; |
700 | ||
701 | assert(i); | |
702 | ||
703 | if (!image_name_is_valid(new_name)) | |
704 | return -EINVAL; | |
705 | ||
d94c2b06 | 706 | if (IMAGE_IS_VENDOR(i) || IMAGE_IS_HOST(i)) |
ebd93cb6 LP |
707 | return -EROFS; |
708 | ||
8e0b6570 LP |
709 | settings = image_settings_path(i); |
710 | if (!settings) | |
711 | return -ENOMEM; | |
712 | ||
bafbac4e LP |
713 | roothash = image_roothash_path(i); |
714 | if (!roothash) | |
715 | return -ENOMEM; | |
716 | ||
30535c16 LP |
717 | /* Make sure we don't interfere with a running nspawn */ |
718 | r = image_path_lock(i->path, LOCK_EX|LOCK_NB, &global_lock, &local_lock); | |
719 | if (r < 0) | |
720 | return r; | |
721 | ||
722 | /* Make sure nobody takes the new name, between the time we | |
723 | * checked it is currently unused in all search paths, and the | |
f8e2f4d6 | 724 | * time we take possession of it */ |
30535c16 LP |
725 | r = image_name_lock(new_name, LOCK_EX|LOCK_NB, &name_lock); |
726 | if (r < 0) | |
727 | return r; | |
728 | ||
5ef46e5f | 729 | r = image_find(IMAGE_MACHINE, new_name, NULL); |
3a6ce860 | 730 | if (r >= 0) |
ebd93cb6 | 731 | return -EEXIST; |
3a6ce860 LP |
732 | if (r != -ENOENT) |
733 | return r; | |
ebd93cb6 LP |
734 | |
735 | switch (i->type) { | |
736 | ||
ebd93cb6 | 737 | case IMAGE_DIRECTORY: |
01b72568 LP |
738 | /* Turn of the immutable bit while we rename the image, so that we can rename it */ |
739 | (void) read_attr_path(i->path, &file_attr); | |
740 | ||
741 | if (file_attr & FS_IMMUTABLE_FL) | |
db9a4254 | 742 | (void) chattr_path(i->path, 0, FS_IMMUTABLE_FL, NULL); |
01b72568 | 743 | |
4831981d | 744 | _fallthrough_; |
01b72568 | 745 | case IMAGE_SUBVOLUME: |
ebd93cb6 LP |
746 | new_path = file_in_same_dir(i->path, new_name); |
747 | break; | |
748 | ||
eb38edce LP |
749 | case IMAGE_BLOCK: |
750 | ||
751 | /* Refuse renaming raw block devices in /dev, the names are picked by udev after all. */ | |
752 | if (path_startswith(i->path, "/dev")) | |
753 | return -EROFS; | |
754 | ||
755 | new_path = file_in_same_dir(i->path, new_name); | |
756 | break; | |
757 | ||
aceac2f0 | 758 | case IMAGE_RAW: { |
ebd93cb6 LP |
759 | const char *fn; |
760 | ||
63c372cb | 761 | fn = strjoina(new_name, ".raw"); |
ebd93cb6 LP |
762 | new_path = file_in_same_dir(i->path, fn); |
763 | break; | |
764 | } | |
765 | ||
766 | default: | |
15411c0c | 767 | return -EOPNOTSUPP; |
ebd93cb6 LP |
768 | } |
769 | ||
770 | if (!new_path) | |
771 | return -ENOMEM; | |
772 | ||
773 | nn = strdup(new_name); | |
774 | if (!nn) | |
775 | return -ENOMEM; | |
776 | ||
f85ef957 AC |
777 | r = rename_noreplace(AT_FDCWD, i->path, AT_FDCWD, new_path); |
778 | if (r < 0) | |
779 | return r; | |
ebd93cb6 | 780 | |
01b72568 LP |
781 | /* Restore the immutable bit, if it was set before */ |
782 | if (file_attr & FS_IMMUTABLE_FL) | |
db9a4254 | 783 | (void) chattr_path(new_path, FS_IMMUTABLE_FL, FS_IMMUTABLE_FL, NULL); |
01b72568 | 784 | |
f9ecfd3b DL |
785 | free_and_replace(i->path, new_path); |
786 | free_and_replace(i->name, nn); | |
ebd93cb6 | 787 | |
8e0b6570 | 788 | STRV_FOREACH(j, settings) { |
bafbac4e | 789 | r = rename_auxiliary_file(*j, new_name, ".nspawn"); |
8e0b6570 LP |
790 | if (r < 0 && r != -ENOENT) |
791 | log_debug_errno(r, "Failed to rename settings file %s, ignoring: %m", *j); | |
792 | } | |
793 | ||
bafbac4e LP |
794 | r = rename_auxiliary_file(roothash, new_name, ".roothash"); |
795 | if (r < 0 && r != -ENOENT) | |
796 | log_debug_errno(r, "Failed to rename roothash file %s, ignoring: %m", roothash); | |
797 | ||
ebd93cb6 LP |
798 | return 0; |
799 | } | |
800 | ||
bafbac4e | 801 | static int clone_auxiliary_file(const char *path, const char *new_name, const char *suffix) { |
8e0b6570 LP |
802 | _cleanup_free_ char *rs = NULL; |
803 | const char *fn; | |
804 | ||
bafbac4e | 805 | fn = strjoina(new_name, suffix); |
8e0b6570 LP |
806 | |
807 | rs = file_in_same_dir(path, fn); | |
808 | if (!rs) | |
809 | return -ENOMEM; | |
810 | ||
8a016c74 | 811 | return copy_file_atomic(path, rs, 0664, 0, 0, COPY_REFLINK); |
8e0b6570 LP |
812 | } |
813 | ||
ebd93cb6 | 814 | int image_clone(Image *i, const char *new_name, bool read_only) { |
8e766630 | 815 | _cleanup_(release_lock_file) LockFile name_lock = LOCK_FILE_INIT; |
8e0b6570 | 816 | _cleanup_strv_free_ char **settings = NULL; |
bafbac4e | 817 | _cleanup_free_ char *roothash = NULL; |
ebd93cb6 | 818 | const char *new_path; |
8e0b6570 | 819 | char **j; |
ebd93cb6 LP |
820 | int r; |
821 | ||
822 | assert(i); | |
823 | ||
824 | if (!image_name_is_valid(new_name)) | |
825 | return -EINVAL; | |
826 | ||
8e0b6570 LP |
827 | settings = image_settings_path(i); |
828 | if (!settings) | |
829 | return -ENOMEM; | |
830 | ||
bafbac4e LP |
831 | roothash = image_roothash_path(i); |
832 | if (!roothash) | |
833 | return -ENOMEM; | |
834 | ||
30535c16 LP |
835 | /* Make sure nobody takes the new name, between the time we |
836 | * checked it is currently unused in all search paths, and the | |
f8e2f4d6 | 837 | * time we take possession of it */ |
30535c16 LP |
838 | r = image_name_lock(new_name, LOCK_EX|LOCK_NB, &name_lock); |
839 | if (r < 0) | |
840 | return r; | |
841 | ||
5ef46e5f | 842 | r = image_find(IMAGE_MACHINE, new_name, NULL); |
3a6ce860 | 843 | if (r >= 0) |
ebd93cb6 | 844 | return -EEXIST; |
3a6ce860 LP |
845 | if (r != -ENOENT) |
846 | return r; | |
ebd93cb6 LP |
847 | |
848 | switch (i->type) { | |
849 | ||
850 | case IMAGE_SUBVOLUME: | |
851 | case IMAGE_DIRECTORY: | |
9a50e3ca | 852 | /* If we can we'll always try to create a new btrfs subvolume here, even if the source is a plain |
13e785f7 | 853 | * directory. */ |
9a50e3ca | 854 | |
63c372cb | 855 | new_path = strjoina("/var/lib/machines/", new_name); |
ebd93cb6 | 856 | |
17cbb288 LP |
857 | r = btrfs_subvol_snapshot(i->path, new_path, |
858 | (read_only ? BTRFS_SNAPSHOT_READ_ONLY : 0) | | |
859 | BTRFS_SNAPSHOT_FALLBACK_COPY | | |
860 | BTRFS_SNAPSHOT_FALLBACK_DIRECTORY | | |
861 | BTRFS_SNAPSHOT_FALLBACK_IMMUTABLE | | |
862 | BTRFS_SNAPSHOT_RECURSIVE | | |
863 | BTRFS_SNAPSHOT_QUOTA); | |
864 | if (r >= 0) | |
9a50e3ca | 865 | /* Enable "subtree" quotas for the copy, if we didn't copy any quota from the source. */ |
8120ee28 | 866 | (void) btrfs_subvol_auto_qgroup(new_path, 0, true); |
5bcd08db | 867 | |
ebd93cb6 LP |
868 | break; |
869 | ||
aceac2f0 | 870 | case IMAGE_RAW: |
63c372cb | 871 | new_path = strjoina("/var/lib/machines/", new_name, ".raw"); |
ebd93cb6 | 872 | |
8a016c74 | 873 | r = copy_file_atomic(i->path, new_path, read_only ? 0444 : 0644, FS_NOCOW_FL, FS_NOCOW_FL, COPY_REFLINK|COPY_CRTIME); |
ebd93cb6 LP |
874 | break; |
875 | ||
eb38edce | 876 | case IMAGE_BLOCK: |
ebd93cb6 | 877 | default: |
15411c0c | 878 | return -EOPNOTSUPP; |
ebd93cb6 LP |
879 | } |
880 | ||
881 | if (r < 0) | |
882 | return r; | |
883 | ||
8e0b6570 | 884 | STRV_FOREACH(j, settings) { |
bafbac4e | 885 | r = clone_auxiliary_file(*j, new_name, ".nspawn"); |
8e0b6570 LP |
886 | if (r < 0 && r != -ENOENT) |
887 | log_debug_errno(r, "Failed to clone settings %s, ignoring: %m", *j); | |
888 | } | |
889 | ||
bafbac4e LP |
890 | r = clone_auxiliary_file(roothash, new_name, ".roothash"); |
891 | if (r < 0 && r != -ENOENT) | |
892 | log_debug_errno(r, "Failed to clone root hash file %s, ignoring: %m", roothash); | |
893 | ||
ebd93cb6 LP |
894 | return 0; |
895 | } | |
896 | ||
897 | int image_read_only(Image *i, bool b) { | |
8e766630 | 898 | _cleanup_(release_lock_file) LockFile global_lock = LOCK_FILE_INIT, local_lock = LOCK_FILE_INIT; |
ebd93cb6 | 899 | int r; |
c7664c07 | 900 | |
ebd93cb6 LP |
901 | assert(i); |
902 | ||
d94c2b06 | 903 | if (IMAGE_IS_VENDOR(i) || IMAGE_IS_HOST(i)) |
ebd93cb6 LP |
904 | return -EROFS; |
905 | ||
30535c16 LP |
906 | /* Make sure we don't interfere with a running nspawn */ |
907 | r = image_path_lock(i->path, LOCK_EX|LOCK_NB, &global_lock, &local_lock); | |
908 | if (r < 0) | |
909 | return r; | |
910 | ||
ebd93cb6 LP |
911 | switch (i->type) { |
912 | ||
913 | case IMAGE_SUBVOLUME: | |
5bcd08db LP |
914 | |
915 | /* Note that we set the flag only on the top-level | |
916 | * subvolume of the image. */ | |
917 | ||
ebd93cb6 LP |
918 | r = btrfs_subvol_set_read_only(i->path, b); |
919 | if (r < 0) | |
920 | return r; | |
01b72568 LP |
921 | |
922 | break; | |
923 | ||
924 | case IMAGE_DIRECTORY: | |
925 | /* For simple directory trees we cannot use the access | |
926 | mode of the top-level directory, since it has an | |
927 | effect on the container itself. However, we can | |
928 | use the "immutable" flag, to at least make the | |
929 | top-level directory read-only. It's not as good as | |
930 | a read-only subvolume, but at least something, and | |
13e785f7 | 931 | we can read the value back. */ |
01b72568 | 932 | |
db9a4254 | 933 | r = chattr_path(i->path, b ? FS_IMMUTABLE_FL : 0, FS_IMMUTABLE_FL, NULL); |
01b72568 LP |
934 | if (r < 0) |
935 | return r; | |
936 | ||
ebd93cb6 LP |
937 | break; |
938 | ||
aceac2f0 | 939 | case IMAGE_RAW: { |
ebd93cb6 LP |
940 | struct stat st; |
941 | ||
942 | if (stat(i->path, &st) < 0) | |
943 | return -errno; | |
944 | ||
945 | if (chmod(i->path, (st.st_mode & 0444) | (b ? 0000 : 0200)) < 0) | |
946 | return -errno; | |
f2068bcc LP |
947 | |
948 | /* If the images is now read-only, it's a good time to | |
949 | * defrag it, given that no write patterns will | |
950 | * fragment it again. */ | |
951 | if (b) | |
952 | (void) btrfs_defrag(i->path); | |
ebd93cb6 LP |
953 | break; |
954 | } | |
955 | ||
eb38edce LP |
956 | case IMAGE_BLOCK: { |
957 | _cleanup_close_ int fd = -1; | |
958 | struct stat st; | |
959 | int state = b; | |
960 | ||
961 | fd = open(i->path, O_CLOEXEC|O_RDONLY|O_NONBLOCK|O_NOCTTY); | |
962 | if (fd < 0) | |
963 | return -errno; | |
964 | ||
965 | if (fstat(fd, &st) < 0) | |
966 | return -errno; | |
967 | if (!S_ISBLK(st.st_mode)) | |
968 | return -ENOTTY; | |
969 | ||
970 | if (ioctl(fd, BLKROSET, &state) < 0) | |
971 | return -errno; | |
972 | ||
973 | break; | |
974 | } | |
975 | ||
ebd93cb6 | 976 | default: |
15411c0c | 977 | return -EOPNOTSUPP; |
ebd93cb6 LP |
978 | } |
979 | ||
980 | return 0; | |
08682124 LP |
981 | } |
982 | ||
30535c16 LP |
983 | int image_path_lock(const char *path, int operation, LockFile *global, LockFile *local) { |
984 | _cleanup_free_ char *p = NULL; | |
985 | LockFile t = LOCK_FILE_INIT; | |
986 | struct stat st; | |
987 | int r; | |
988 | ||
989 | assert(path); | |
990 | assert(global); | |
991 | assert(local); | |
992 | ||
993 | /* Locks an image path. This actually creates two locks: one | |
994 | * "local" one, next to the image path itself, which might be | |
995 | * shared via NFS. And another "global" one, in /run, that | |
996 | * uses the device/inode number. This has the benefit that we | |
997 | * can even lock a tree that is a mount point, correctly. */ | |
998 | ||
30535c16 LP |
999 | if (!path_is_absolute(path)) |
1000 | return -EINVAL; | |
1001 | ||
b6e953f2 LP |
1002 | if (getenv_bool("SYSTEMD_NSPAWN_LOCK") == 0) { |
1003 | *local = *global = (LockFile) LOCK_FILE_INIT; | |
1004 | return 0; | |
1005 | } | |
1006 | ||
1007 | if (path_equal(path, "/")) | |
1008 | return -EBUSY; | |
1009 | ||
30535c16 | 1010 | if (stat(path, &st) >= 0) { |
eb38edce LP |
1011 | if (S_ISBLK(st.st_mode)) |
1012 | r = asprintf(&p, "/run/systemd/nspawn/locks/block-%u:%u", major(st.st_rdev), minor(st.st_rdev)); | |
1013 | else if (S_ISDIR(st.st_mode) || S_ISREG(st.st_mode)) | |
1014 | r = asprintf(&p, "/run/systemd/nspawn/locks/inode-%lu:%lu", (unsigned long) st.st_dev, (unsigned long) st.st_ino); | |
1015 | else | |
1016 | return -ENOTTY; | |
1017 | ||
1018 | if (r < 0) | |
30535c16 LP |
1019 | return -ENOMEM; |
1020 | } | |
1021 | ||
eb38edce LP |
1022 | /* For block devices we don't need the "local" lock, as the major/minor lock above should be sufficient, since |
1023 | * block devices are device local anyway. */ | |
1024 | if (!path_startswith(path, "/dev")) { | |
1025 | r = make_lock_file_for(path, operation, &t); | |
8be17c9b LT |
1026 | if (r < 0) { |
1027 | if ((operation & LOCK_SH) && r == -EROFS) | |
771b7ead | 1028 | log_debug_errno(r, "Failed to create shared lock for '%s', ignoring: %m", path); |
8be17c9b LT |
1029 | else |
1030 | return r; | |
1031 | } | |
eb38edce | 1032 | } |
30535c16 LP |
1033 | |
1034 | if (p) { | |
6e5dcce4 | 1035 | (void) mkdir_p("/run/systemd/nspawn/locks", 0700); |
30535c16 LP |
1036 | |
1037 | r = make_lock_file(p, operation, global); | |
1038 | if (r < 0) { | |
1039 | release_lock_file(&t); | |
1040 | return r; | |
1041 | } | |
546dbec5 LP |
1042 | } else |
1043 | *global = (LockFile) LOCK_FILE_INIT; | |
30535c16 LP |
1044 | |
1045 | *local = t; | |
1046 | return 0; | |
1047 | } | |
1048 | ||
cb81cd80 | 1049 | int image_set_limit(Image *i, uint64_t referenced_max) { |
d6ce17c7 LP |
1050 | assert(i); |
1051 | ||
d94c2b06 | 1052 | if (IMAGE_IS_VENDOR(i) || IMAGE_IS_HOST(i)) |
d6ce17c7 LP |
1053 | return -EROFS; |
1054 | ||
1055 | if (i->type != IMAGE_SUBVOLUME) | |
15411c0c | 1056 | return -EOPNOTSUPP; |
d6ce17c7 | 1057 | |
5bcd08db LP |
1058 | /* We set the quota both for the subvolume as well as for the |
1059 | * subtree. The latter is mostly for historical reasons, since | |
1060 | * we didn't use to have a concept of subtree quota, and hence | |
1061 | * only modified the subvolume quota. */ | |
1062 | ||
1063 | (void) btrfs_qgroup_set_limit(i->path, 0, referenced_max); | |
1064 | (void) btrfs_subvol_auto_qgroup(i->path, 0, true); | |
1065 | return btrfs_subvol_set_subtree_quota_limit(i->path, 0, referenced_max); | |
d6ce17c7 LP |
1066 | } |
1067 | ||
c7664c07 | 1068 | int image_read_metadata(Image *i) { |
8e766630 | 1069 | _cleanup_(release_lock_file) LockFile global_lock = LOCK_FILE_INIT, local_lock = LOCK_FILE_INIT; |
c7664c07 LP |
1070 | int r; |
1071 | ||
1072 | assert(i); | |
1073 | ||
1074 | r = image_path_lock(i->path, LOCK_SH|LOCK_NB, &global_lock, &local_lock); | |
1075 | if (r < 0) | |
1076 | return r; | |
1077 | ||
1078 | switch (i->type) { | |
1079 | ||
1080 | case IMAGE_SUBVOLUME: | |
1081 | case IMAGE_DIRECTORY: { | |
1082 | _cleanup_strv_free_ char **machine_info = NULL, **os_release = NULL; | |
1083 | sd_id128_t machine_id = SD_ID128_NULL; | |
1084 | _cleanup_free_ char *hostname = NULL; | |
1085 | _cleanup_free_ char *path = NULL; | |
1086 | ||
62570f6f | 1087 | r = chase_symlinks("/etc/hostname", i->path, CHASE_PREFIX_ROOT|CHASE_TRAIL_SLASH, &path); |
c7664c07 LP |
1088 | if (r < 0 && r != -ENOENT) |
1089 | log_debug_errno(r, "Failed to chase /etc/hostname in image %s: %m", i->name); | |
1090 | else if (r >= 0) { | |
1091 | r = read_etc_hostname(path, &hostname); | |
1092 | if (r < 0) | |
1093 | log_debug_errno(errno, "Failed to read /etc/hostname of image %s: %m", i->name); | |
1094 | } | |
1095 | ||
1096 | path = mfree(path); | |
1097 | ||
62570f6f | 1098 | r = chase_symlinks("/etc/machine-id", i->path, CHASE_PREFIX_ROOT|CHASE_TRAIL_SLASH, &path); |
c7664c07 LP |
1099 | if (r < 0 && r != -ENOENT) |
1100 | log_debug_errno(r, "Failed to chase /etc/machine-id in image %s: %m", i->name); | |
1101 | else if (r >= 0) { | |
1102 | _cleanup_close_ int fd = -1; | |
1103 | ||
1104 | fd = open(path, O_RDONLY|O_CLOEXEC|O_NOCTTY); | |
1105 | if (fd < 0) | |
1106 | log_debug_errno(errno, "Failed to open %s: %m", path); | |
1107 | else { | |
1108 | r = id128_read_fd(fd, ID128_PLAIN, &machine_id); | |
1109 | if (r < 0) | |
1110 | log_debug_errno(r, "Image %s contains invalid machine ID.", i->name); | |
1111 | } | |
1112 | } | |
1113 | ||
1114 | path = mfree(path); | |
1115 | ||
62570f6f | 1116 | r = chase_symlinks("/etc/machine-info", i->path, CHASE_PREFIX_ROOT|CHASE_TRAIL_SLASH, &path); |
c7664c07 LP |
1117 | if (r < 0 && r != -ENOENT) |
1118 | log_debug_errno(r, "Failed to chase /etc/machine-info in image %s: %m", i->name); | |
1119 | else if (r >= 0) { | |
aa8fbc74 | 1120 | r = load_env_file_pairs(NULL, path, &machine_info); |
c7664c07 LP |
1121 | if (r < 0) |
1122 | log_debug_errno(r, "Failed to parse machine-info data of %s: %m", i->name); | |
1123 | } | |
1124 | ||
d58ad743 LP |
1125 | r = load_os_release_pairs(i->path, &os_release); |
1126 | if (r < 0) | |
1127 | log_debug_errno(r, "Failed to read os-release in image, ignoring: %m"); | |
c7664c07 LP |
1128 | |
1129 | free_and_replace(i->hostname, hostname); | |
1130 | i->machine_id = machine_id; | |
1131 | strv_free_and_replace(i->machine_info, machine_info); | |
1132 | strv_free_and_replace(i->os_release, os_release); | |
1133 | ||
1134 | break; | |
1135 | } | |
1136 | ||
1137 | case IMAGE_RAW: | |
1138 | case IMAGE_BLOCK: { | |
1139 | _cleanup_(loop_device_unrefp) LoopDevice *d = NULL; | |
1140 | _cleanup_(dissected_image_unrefp) DissectedImage *m = NULL; | |
1141 | ||
1142 | r = loop_device_make_by_path(i->path, O_RDONLY, &d); | |
1143 | if (r < 0) | |
1144 | return r; | |
1145 | ||
1146 | r = dissect_image(d->fd, NULL, 0, DISSECT_IMAGE_REQUIRE_ROOT, &m); | |
1147 | if (r < 0) | |
1148 | return r; | |
1149 | ||
1150 | r = dissected_image_acquire_metadata(m); | |
1151 | if (r < 0) | |
1152 | return r; | |
1153 | ||
1154 | free_and_replace(i->hostname, m->hostname); | |
1155 | i->machine_id = m->machine_id; | |
1156 | strv_free_and_replace(i->machine_info, m->machine_info); | |
1157 | strv_free_and_replace(i->os_release, m->os_release); | |
1158 | ||
1159 | break; | |
1160 | } | |
1161 | ||
1162 | default: | |
1163 | return -EOPNOTSUPP; | |
1164 | } | |
1165 | ||
1166 | i->metadata_valid = true; | |
1167 | ||
1168 | return 0; | |
1169 | } | |
1170 | ||
30535c16 | 1171 | int image_name_lock(const char *name, int operation, LockFile *ret) { |
30535c16 LP |
1172 | assert(name); |
1173 | assert(ret); | |
1174 | ||
1175 | /* Locks an image name, regardless of the precise path used. */ | |
1176 | ||
1177 | if (!image_name_is_valid(name)) | |
1178 | return -EINVAL; | |
1179 | ||
b6e953f2 LP |
1180 | if (getenv_bool("SYSTEMD_NSPAWN_LOCK") == 0) { |
1181 | *ret = (LockFile) LOCK_FILE_INIT; | |
1182 | return 0; | |
1183 | } | |
1184 | ||
30535c16 LP |
1185 | if (streq(name, ".host")) |
1186 | return -EBUSY; | |
1187 | ||
6e5dcce4 ZJS |
1188 | const char *p = strjoina("/run/systemd/nspawn/locks/name-", name); |
1189 | (void) mkdir_p("/run/systemd/nspawn/locks", 0700); | |
30535c16 LP |
1190 | return make_lock_file(p, operation, ret); |
1191 | } | |
1192 | ||
1193 | bool image_name_is_valid(const char *s) { | |
1194 | if (!filename_is_valid(s)) | |
1195 | return false; | |
1196 | ||
1197 | if (string_has_cc(s, NULL)) | |
1198 | return false; | |
1199 | ||
1200 | if (!utf8_is_valid(s)) | |
1201 | return false; | |
1202 | ||
1203 | /* Temporary files for atomically creating new files */ | |
1204 | if (startswith(s, ".#")) | |
1205 | return false; | |
1206 | ||
1207 | return true; | |
1208 | } | |
1209 | ||
ace9ab19 LP |
1210 | bool image_in_search_path(ImageClass class, const char *image) { |
1211 | const char *path; | |
1212 | ||
1213 | assert(image); | |
1214 | ||
1215 | NULSTR_FOREACH(path, image_search_path[class]) { | |
1216 | const char *p; | |
1217 | size_t k; | |
1218 | ||
1219 | p = path_startswith(image, path); | |
1220 | if (!p) | |
1221 | continue; | |
1222 | ||
1223 | /* Make sure there's a filename following */ | |
1224 | k = strcspn(p, "/"); | |
1225 | if (k == 0) | |
1226 | continue; | |
1227 | ||
1228 | p += k; | |
1229 | ||
1230 | /* Accept trailing slashes */ | |
1231 | if (p[strspn(p, "/")] == 0) | |
1232 | return true; | |
1233 | ||
1234 | } | |
1235 | ||
1236 | return false; | |
1237 | } | |
1238 | ||
cd61c3bf LP |
1239 | static const char* const image_type_table[_IMAGE_TYPE_MAX] = { |
1240 | [IMAGE_DIRECTORY] = "directory", | |
1241 | [IMAGE_SUBVOLUME] = "subvolume", | |
aceac2f0 | 1242 | [IMAGE_RAW] = "raw", |
eb38edce | 1243 | [IMAGE_BLOCK] = "block", |
cd61c3bf LP |
1244 | }; |
1245 | ||
1246 | DEFINE_STRING_TABLE_LOOKUP(image_type, ImageType); |