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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 | ||
657ee2d8 | 149 | i->path = path_join(path, filename); |
5fc7f358 LP |
150 | if (!i->path) |
151 | return -ENOMEM; | |
152 | ||
858d36c1 | 153 | path_simplify(i->path, false); |
cd61c3bf | 154 | |
1cc6c93a | 155 | *ret = TAKE_PTR(i); |
c2ce6a3d | 156 | |
cd61c3bf LP |
157 | return 0; |
158 | } | |
159 | ||
4756c94e LP |
160 | static int extract_pretty(const char *path, const char *suffix, char **ret) { |
161 | _cleanup_free_ char *name = NULL; | |
162 | const char *p; | |
163 | size_t n; | |
164 | ||
165 | assert(path); | |
166 | assert(ret); | |
167 | ||
168 | p = last_path_component(path); | |
169 | n = strcspn(p, "/"); | |
170 | ||
171 | name = strndup(p, n); | |
172 | if (!name) | |
173 | return -ENOMEM; | |
174 | ||
175 | if (suffix) { | |
176 | char *e; | |
177 | ||
178 | e = endswith(name, suffix); | |
179 | if (!e) | |
180 | return -EINVAL; | |
181 | ||
182 | *e = 0; | |
183 | } | |
184 | ||
185 | if (!image_name_is_valid(name)) | |
186 | return -EINVAL; | |
187 | ||
188 | *ret = TAKE_PTR(name); | |
189 | return 0; | |
190 | } | |
191 | ||
5fc7f358 LP |
192 | static int image_make( |
193 | const char *pretty, | |
194 | int dfd, | |
195 | const char *path, | |
196 | const char *filename, | |
3a6ce860 | 197 | const struct stat *st, |
5fc7f358 LP |
198 | Image **ret) { |
199 | ||
2570578d | 200 | _cleanup_free_ char *pretty_buffer = NULL, *parent = NULL; |
3a6ce860 | 201 | struct stat stbuf; |
5fc7f358 | 202 | bool read_only; |
cd61c3bf LP |
203 | int r; |
204 | ||
3a6ce860 | 205 | assert(dfd >= 0 || dfd == AT_FDCWD); |
bcb846f3 | 206 | assert(path || dfd == AT_FDCWD); |
5fc7f358 | 207 | assert(filename); |
cd61c3bf | 208 | |
eb38edce | 209 | /* We explicitly *do* follow symlinks here, since we want to allow symlinking trees, raw files and block |
3a6ce860 LP |
210 | * devices into /var/lib/machines/, and treat them normally. |
211 | * | |
212 | * This function returns -ENOENT if we can't find the image after all, and -EMEDIUMTYPE if it's not a file we | |
213 | * recognize. */ | |
cd61c3bf | 214 | |
3a6ce860 LP |
215 | if (!st) { |
216 | if (fstatat(dfd, filename, &stbuf, 0) < 0) | |
217 | return -errno; | |
218 | ||
219 | st = &stbuf; | |
220 | } | |
cd61c3bf | 221 | |
2570578d LP |
222 | if (!path) { |
223 | if (dfd == AT_FDCWD) | |
224 | (void) safe_getcwd(&parent); | |
225 | else | |
226 | (void) fd_get_path(dfd, &parent); | |
227 | } | |
bcb846f3 | 228 | |
5fc7f358 LP |
229 | read_only = |
230 | (path && path_startswith(path, "/usr")) || | |
08ff5529 | 231 | (faccessat(dfd, filename, W_OK, AT_EACCESS) < 0 && errno == EROFS); |
86e339c8 | 232 | |
3a6ce860 | 233 | if (S_ISDIR(st->st_mode)) { |
01b72568 LP |
234 | _cleanup_close_ int fd = -1; |
235 | unsigned file_attr = 0; | |
cd61c3bf | 236 | |
c2ce6a3d | 237 | if (!ret) |
3a6ce860 | 238 | return 0; |
cd61c3bf | 239 | |
4756c94e LP |
240 | if (!pretty) { |
241 | r = extract_pretty(filename, NULL, &pretty_buffer); | |
242 | if (r < 0) | |
243 | return r; | |
244 | ||
245 | pretty = pretty_buffer; | |
246 | } | |
5fc7f358 | 247 | |
01b72568 LP |
248 | fd = openat(dfd, filename, O_CLOEXEC|O_NOCTTY|O_DIRECTORY); |
249 | if (fd < 0) | |
250 | return -errno; | |
251 | ||
c2ce6a3d | 252 | /* btrfs subvolumes have inode 256 */ |
3a6ce860 | 253 | if (st->st_ino == 256) { |
cd61c3bf | 254 | |
21222ea5 LP |
255 | r = btrfs_is_filesystem(fd); |
256 | if (r < 0) | |
257 | return r; | |
258 | if (r) { | |
10f9c755 | 259 | BtrfsSubvolInfo info; |
cd61c3bf | 260 | |
c2ce6a3d | 261 | /* It's a btrfs subvolume */ |
cd61c3bf | 262 | |
5bcd08db | 263 | r = btrfs_subvol_get_info_fd(fd, 0, &info); |
10f9c755 LP |
264 | if (r < 0) |
265 | return r; | |
c2ce6a3d LP |
266 | |
267 | r = image_new(IMAGE_SUBVOLUME, | |
5fc7f358 | 268 | pretty, |
c2ce6a3d | 269 | path, |
5fc7f358 LP |
270 | filename, |
271 | info.read_only || read_only, | |
10f9c755 | 272 | info.otime, |
c2ce6a3d | 273 | 0, |
c2ce6a3d LP |
274 | ret); |
275 | if (r < 0) | |
276 | return r; | |
277 | ||
5bcd08db LP |
278 | if (btrfs_quota_scan_ongoing(fd) == 0) { |
279 | BtrfsQuotaInfo quota; | |
b6b18498 | 280 | |
5bcd08db LP |
281 | r = btrfs_subvol_get_subtree_quota_fd(fd, 0, "a); |
282 | if (r >= 0) { | |
283 | (*ret)->usage = quota.referenced; | |
284 | (*ret)->usage_exclusive = quota.exclusive; | |
285 | ||
286 | (*ret)->limit = quota.referenced_max; | |
287 | (*ret)->limit_exclusive = quota.exclusive_max; | |
288 | } | |
b6b18498 LP |
289 | } |
290 | ||
3a6ce860 | 291 | return 0; |
cd61c3bf | 292 | } |
c2ce6a3d | 293 | } |
cd61c3bf | 294 | |
01b72568 LP |
295 | /* If the IMMUTABLE bit is set, we consider the |
296 | * directory read-only. Since the ioctl is not | |
297 | * supported everywhere we ignore failures. */ | |
298 | (void) read_attr_fd(fd, &file_attr); | |
cd61c3bf | 299 | |
01b72568 | 300 | /* It's just a normal directory. */ |
c2ce6a3d | 301 | r = image_new(IMAGE_DIRECTORY, |
5fc7f358 | 302 | pretty, |
c2ce6a3d | 303 | path, |
5fc7f358 | 304 | filename, |
01b72568 | 305 | read_only || (file_attr & FS_IMMUTABLE_FL), |
c2ce6a3d LP |
306 | 0, |
307 | 0, | |
308 | ret); | |
309 | if (r < 0) | |
310 | return r; | |
cd61c3bf | 311 | |
3a6ce860 | 312 | return 0; |
cd61c3bf | 313 | |
3a6ce860 | 314 | } else if (S_ISREG(st->st_mode) && endswith(filename, ".raw")) { |
10f9c755 | 315 | usec_t crtime = 0; |
cd61c3bf | 316 | |
aceac2f0 | 317 | /* It's a RAW disk image */ |
cd61c3bf | 318 | |
c2ce6a3d | 319 | if (!ret) |
3a6ce860 | 320 | return 0; |
cd61c3bf | 321 | |
4756c94e | 322 | (void) fd_getcrtime_at(dfd, filename, &crtime, 0); |
10f9c755 | 323 | |
4756c94e LP |
324 | if (!pretty) { |
325 | r = extract_pretty(filename, ".raw", &pretty_buffer); | |
326 | if (r < 0) | |
327 | return r; | |
328 | ||
329 | pretty = pretty_buffer; | |
330 | } | |
10f9c755 | 331 | |
aceac2f0 | 332 | r = image_new(IMAGE_RAW, |
5fc7f358 | 333 | pretty, |
c2ce6a3d | 334 | path, |
5fc7f358 | 335 | filename, |
3a6ce860 | 336 | !(st->st_mode & 0222) || read_only, |
10f9c755 | 337 | crtime, |
3a6ce860 | 338 | timespec_load(&st->st_mtim), |
c2ce6a3d LP |
339 | ret); |
340 | if (r < 0) | |
341 | return r; | |
cd61c3bf | 342 | |
3a6ce860 LP |
343 | (*ret)->usage = (*ret)->usage_exclusive = st->st_blocks * 512; |
344 | (*ret)->limit = (*ret)->limit_exclusive = st->st_size; | |
b6b18498 | 345 | |
3a6ce860 | 346 | return 0; |
eb38edce | 347 | |
3a6ce860 | 348 | } else if (S_ISBLK(st->st_mode)) { |
eb38edce LP |
349 | _cleanup_close_ int block_fd = -1; |
350 | uint64_t size = UINT64_MAX; | |
351 | ||
352 | /* A block device */ | |
353 | ||
354 | if (!ret) | |
3a6ce860 | 355 | return 0; |
eb38edce | 356 | |
4756c94e LP |
357 | if (!pretty) { |
358 | r = extract_pretty(filename, NULL, &pretty_buffer); | |
359 | if (r < 0) | |
360 | return r; | |
361 | ||
362 | pretty = pretty_buffer; | |
363 | } | |
eb38edce LP |
364 | |
365 | block_fd = openat(dfd, filename, O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_NOCTTY); | |
366 | if (block_fd < 0) | |
2570578d | 367 | log_debug_errno(errno, "Failed to open block device %s/%s, ignoring: %m", path ?: strnull(parent), filename); |
eb38edce | 368 | else { |
3a6ce860 LP |
369 | /* Refresh stat data after opening the node */ |
370 | if (fstat(block_fd, &stbuf) < 0) | |
eb38edce | 371 | return -errno; |
3a6ce860 LP |
372 | st = &stbuf; |
373 | ||
374 | if (!S_ISBLK(st->st_mode)) /* Verify that what we opened is actually what we think it is */ | |
eb38edce LP |
375 | return -ENOTTY; |
376 | ||
377 | if (!read_only) { | |
378 | int state = 0; | |
379 | ||
380 | if (ioctl(block_fd, BLKROGET, &state) < 0) | |
2570578d | 381 | log_debug_errno(errno, "Failed to issue BLKROGET on device %s/%s, ignoring: %m", path ?: strnull(parent), filename); |
eb38edce LP |
382 | else if (state) |
383 | read_only = true; | |
384 | } | |
385 | ||
386 | if (ioctl(block_fd, BLKGETSIZE64, &size) < 0) | |
2570578d | 387 | log_debug_errno(errno, "Failed to issue BLKGETSIZE64 on device %s/%s, ignoring: %m", path ?: strnull(parent), filename); |
eb38edce LP |
388 | |
389 | block_fd = safe_close(block_fd); | |
390 | } | |
391 | ||
392 | r = image_new(IMAGE_BLOCK, | |
393 | pretty, | |
394 | path, | |
395 | filename, | |
3a6ce860 | 396 | !(st->st_mode & 0222) || read_only, |
eb38edce LP |
397 | 0, |
398 | 0, | |
399 | ret); | |
400 | if (r < 0) | |
401 | return r; | |
402 | ||
ed0cb346 | 403 | if (!IN_SET(size, 0, UINT64_MAX)) |
eb38edce LP |
404 | (*ret)->usage = (*ret)->usage_exclusive = (*ret)->limit = (*ret)->limit_exclusive = size; |
405 | ||
3a6ce860 | 406 | return 0; |
c2ce6a3d | 407 | } |
cd61c3bf | 408 | |
3a6ce860 | 409 | return -EMEDIUMTYPE; |
c2ce6a3d | 410 | } |
cd61c3bf | 411 | |
5ef46e5f | 412 | int image_find(ImageClass class, const char *name, Image **ret) { |
c2ce6a3d LP |
413 | const char *path; |
414 | int r; | |
cd61c3bf | 415 | |
5ef46e5f LP |
416 | assert(class >= 0); |
417 | assert(class < _IMAGE_CLASS_MAX); | |
c2ce6a3d | 418 | assert(name); |
cd61c3bf | 419 | |
c2ce6a3d LP |
420 | /* There are no images with invalid names */ |
421 | if (!image_name_is_valid(name)) | |
3a6ce860 | 422 | return -ENOENT; |
cd61c3bf | 423 | |
5ef46e5f | 424 | NULSTR_FOREACH(path, image_search_path[class]) { |
c2ce6a3d | 425 | _cleanup_closedir_ DIR *d = NULL; |
3a6ce860 | 426 | struct stat st; |
cd61c3bf | 427 | |
c2ce6a3d LP |
428 | d = opendir(path); |
429 | if (!d) { | |
430 | if (errno == ENOENT) | |
431 | continue; | |
cd61c3bf | 432 | |
c2ce6a3d LP |
433 | return -errno; |
434 | } | |
cd61c3bf | 435 | |
3a6ce860 LP |
436 | /* As mentioned above, we follow symlinks on this fstatat(), because we want to permit people to |
437 | * symlink block devices into the search path */ | |
438 | if (fstatat(dirfd(d), name, &st, 0) < 0) { | |
aceac2f0 | 439 | _cleanup_free_ char *raw = NULL; |
5fc7f358 | 440 | |
3a6ce860 LP |
441 | if (errno != ENOENT) |
442 | return -errno; | |
443 | ||
aceac2f0 LP |
444 | raw = strappend(name, ".raw"); |
445 | if (!raw) | |
5fc7f358 LP |
446 | return -ENOMEM; |
447 | ||
3a6ce860 LP |
448 | if (fstatat(dirfd(d), raw, &st, 0) < 0) { |
449 | ||
450 | if (errno == ENOENT) | |
451 | continue; | |
452 | ||
453 | return -errno; | |
454 | } | |
455 | ||
456 | if (!S_ISREG(st.st_mode)) | |
5fc7f358 | 457 | continue; |
3a6ce860 LP |
458 | |
459 | r = image_make(name, dirfd(d), path, raw, &st, ret); | |
460 | ||
461 | } else { | |
462 | if (!S_ISDIR(st.st_mode) && !S_ISBLK(st.st_mode)) | |
463 | continue; | |
464 | ||
465 | r = image_make(name, dirfd(d), path, name, &st, ret); | |
5fc7f358 | 466 | } |
3a6ce860 LP |
467 | if (IN_SET(r, -ENOENT, -EMEDIUMTYPE)) |
468 | continue; | |
c2ce6a3d LP |
469 | if (r < 0) |
470 | return r; | |
cd61c3bf | 471 | |
cf604fd4 LP |
472 | if (ret) |
473 | (*ret)->discoverable = true; | |
474 | ||
c2ce6a3d LP |
475 | return 1; |
476 | } | |
477 | ||
cf604fd4 LP |
478 | if (class == IMAGE_MACHINE && streq(name, ".host")) { |
479 | r = image_make(".host", AT_FDCWD, NULL, "/", NULL, ret); | |
480 | if (r < 0) | |
481 | return r; | |
482 | ||
483 | if (ret) | |
484 | (*ret)->discoverable = true; | |
485 | ||
486 | return r; | |
487 | } | |
5fc7f358 | 488 | |
3a6ce860 | 489 | return -ENOENT; |
c2ce6a3d LP |
490 | }; |
491 | ||
2ddf182b | 492 | int image_from_path(const char *path, Image **ret) { |
cf604fd4 LP |
493 | |
494 | /* Note that we don't set the 'discoverable' field of the returned object, because we don't check here whether | |
495 | * 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 | 496 | * overridden by another, different image earlier in the search path */ |
cf604fd4 | 497 | |
2ddf182b LP |
498 | if (path_equal(path, "/")) |
499 | return image_make(".host", AT_FDCWD, NULL, "/", NULL, ret); | |
500 | ||
501 | return image_make(NULL, AT_FDCWD, NULL, path, NULL, ret); | |
502 | } | |
503 | ||
504 | int image_find_harder(ImageClass class, const char *name_or_path, Image **ret) { | |
505 | if (image_name_is_valid(name_or_path)) | |
506 | return image_find(class, name_or_path, ret); | |
507 | ||
508 | return image_from_path(name_or_path, ret); | |
509 | } | |
510 | ||
5ef46e5f | 511 | int image_discover(ImageClass class, Hashmap *h) { |
c2ce6a3d LP |
512 | const char *path; |
513 | int r; | |
514 | ||
5ef46e5f LP |
515 | assert(class >= 0); |
516 | assert(class < _IMAGE_CLASS_MAX); | |
c2ce6a3d LP |
517 | assert(h); |
518 | ||
5ef46e5f | 519 | NULSTR_FOREACH(path, image_search_path[class]) { |
c2ce6a3d LP |
520 | _cleanup_closedir_ DIR *d = NULL; |
521 | struct dirent *de; | |
522 | ||
523 | d = opendir(path); | |
524 | if (!d) { | |
525 | if (errno == ENOENT) | |
a67a4c8c | 526 | continue; |
c2ce6a3d LP |
527 | |
528 | return -errno; | |
529 | } | |
530 | ||
531 | FOREACH_DIRENT_ALL(de, d, return -errno) { | |
532 | _cleanup_(image_unrefp) Image *image = NULL; | |
1bf36bf9 | 533 | _cleanup_free_ char *truncated = NULL; |
3a6ce860 LP |
534 | const char *pretty; |
535 | struct stat st; | |
c2ce6a3d | 536 | |
1bf36bf9 | 537 | if (dot_or_dot_dot(de->d_name)) |
c2ce6a3d LP |
538 | continue; |
539 | ||
3a6ce860 LP |
540 | /* As mentioned above, we follow symlinks on this fstatat(), because we want to permit people |
541 | * to symlink block devices into the search path */ | |
542 | if (fstatat(dirfd(d), de->d_name, &st, 0) < 0) { | |
543 | if (errno == ENOENT) | |
544 | continue; | |
545 | ||
546 | return -errno; | |
547 | } | |
548 | ||
549 | if (S_ISREG(st.st_mode)) { | |
550 | const char *e; | |
551 | ||
552 | e = endswith(de->d_name, ".raw"); | |
553 | if (!e) | |
554 | continue; | |
555 | ||
1bf36bf9 LP |
556 | truncated = strndup(de->d_name, e - de->d_name); |
557 | if (!truncated) | |
558 | return -ENOMEM; | |
559 | ||
560 | pretty = truncated; | |
3a6ce860 | 561 | } else if (S_ISDIR(st.st_mode) || S_ISBLK(st.st_mode)) |
1bf36bf9 | 562 | pretty = de->d_name; |
3a6ce860 LP |
563 | else |
564 | continue; | |
1bf36bf9 LP |
565 | |
566 | if (!image_name_is_valid(pretty)) | |
567 | continue; | |
568 | ||
569 | if (hashmap_contains(h, pretty)) | |
c2ce6a3d LP |
570 | continue; |
571 | ||
3a6ce860 LP |
572 | r = image_make(pretty, dirfd(d), path, de->d_name, &st, &image); |
573 | if (IN_SET(r, -ENOENT, -EMEDIUMTYPE)) | |
c2ce6a3d LP |
574 | continue; |
575 | if (r < 0) | |
576 | return r; | |
577 | ||
cf604fd4 LP |
578 | image->discoverable = true; |
579 | ||
c2ce6a3d LP |
580 | r = hashmap_put(h, image->name, image); |
581 | if (r < 0) | |
582 | return r; | |
583 | ||
584 | image = NULL; | |
cd61c3bf LP |
585 | } |
586 | } | |
587 | ||
5ef46e5f | 588 | if (class == IMAGE_MACHINE && !hashmap_contains(h, ".host")) { |
5fc7f358 LP |
589 | _cleanup_(image_unrefp) Image *image = NULL; |
590 | ||
3a6ce860 | 591 | r = image_make(".host", AT_FDCWD, NULL, "/", NULL, &image); |
5fc7f358 LP |
592 | if (r < 0) |
593 | return r; | |
594 | ||
cf604fd4 LP |
595 | image->discoverable = true; |
596 | ||
5fc7f358 LP |
597 | r = hashmap_put(h, image->name, image); |
598 | if (r < 0) | |
599 | return r; | |
600 | ||
601 | image = NULL; | |
5fc7f358 LP |
602 | } |
603 | ||
cd61c3bf LP |
604 | return 0; |
605 | } | |
606 | ||
08682124 | 607 | int image_remove(Image *i) { |
8e766630 | 608 | _cleanup_(release_lock_file) LockFile global_lock = LOCK_FILE_INIT, local_lock = LOCK_FILE_INIT; |
8e0b6570 | 609 | _cleanup_strv_free_ char **settings = NULL; |
bafbac4e | 610 | _cleanup_free_ char *roothash = NULL; |
8e0b6570 | 611 | char **j; |
30535c16 LP |
612 | int r; |
613 | ||
08682124 LP |
614 | assert(i); |
615 | ||
d94c2b06 | 616 | if (IMAGE_IS_VENDOR(i) || IMAGE_IS_HOST(i)) |
08682124 LP |
617 | return -EROFS; |
618 | ||
8e0b6570 LP |
619 | settings = image_settings_path(i); |
620 | if (!settings) | |
621 | return -ENOMEM; | |
622 | ||
bafbac4e LP |
623 | roothash = image_roothash_path(i); |
624 | if (!roothash) | |
625 | return -ENOMEM; | |
626 | ||
30535c16 LP |
627 | /* Make sure we don't interfere with a running nspawn */ |
628 | r = image_path_lock(i->path, LOCK_EX|LOCK_NB, &global_lock, &local_lock); | |
629 | if (r < 0) | |
630 | return r; | |
631 | ||
ebd93cb6 LP |
632 | switch (i->type) { |
633 | ||
634 | case IMAGE_SUBVOLUME: | |
9fb0b9c7 LP |
635 | |
636 | /* Let's unlink first, maybe it is a symlink? If that works we are happy. Otherwise, let's get out the | |
637 | * big guns */ | |
638 | if (unlink(i->path) < 0) { | |
639 | r = btrfs_subvol_remove(i->path, BTRFS_REMOVE_RECURSIVE|BTRFS_REMOVE_QUOTA); | |
640 | if (r < 0) | |
641 | return r; | |
642 | } | |
643 | ||
8e0b6570 | 644 | break; |
ebd93cb6 LP |
645 | |
646 | case IMAGE_DIRECTORY: | |
01b72568 | 647 | /* Allow deletion of read-only directories */ |
db9a4254 | 648 | (void) chattr_path(i->path, 0, FS_IMMUTABLE_FL, NULL); |
8e0b6570 LP |
649 | r = rm_rf(i->path, REMOVE_ROOT|REMOVE_PHYSICAL|REMOVE_SUBVOLUME); |
650 | if (r < 0) | |
651 | return r; | |
652 | ||
653 | break; | |
01b72568 | 654 | |
eb38edce LP |
655 | case IMAGE_BLOCK: |
656 | ||
657 | /* If this is inside of /dev, then it's a real block device, hence let's not touch the device node | |
658 | * itself (but let's remove the stuff stored alongside it). If it's anywhere else, let's try to unlink | |
659 | * the thing (it's most likely a symlink after all). */ | |
660 | ||
661 | if (path_startswith(i->path, "/dev")) | |
662 | break; | |
663 | ||
4831981d | 664 | _fallthrough_; |
aceac2f0 | 665 | case IMAGE_RAW: |
41d1ed05 LP |
666 | if (unlink(i->path) < 0) |
667 | return -errno; | |
8e0b6570 | 668 | break; |
ebd93cb6 LP |
669 | |
670 | default: | |
15411c0c | 671 | return -EOPNOTSUPP; |
ebd93cb6 | 672 | } |
8e0b6570 LP |
673 | |
674 | STRV_FOREACH(j, settings) { | |
675 | if (unlink(*j) < 0 && errno != ENOENT) | |
676 | log_debug_errno(errno, "Failed to unlink %s, ignoring: %m", *j); | |
677 | } | |
678 | ||
bafbac4e LP |
679 | if (unlink(roothash) < 0 && errno != ENOENT) |
680 | log_debug_errno(errno, "Failed to unlink %s, ignoring: %m", roothash); | |
681 | ||
8e0b6570 LP |
682 | return 0; |
683 | } | |
684 | ||
bafbac4e | 685 | static int rename_auxiliary_file(const char *path, const char *new_name, const char *suffix) { |
8e0b6570 LP |
686 | _cleanup_free_ char *rs = NULL; |
687 | const char *fn; | |
688 | ||
bafbac4e | 689 | fn = strjoina(new_name, suffix); |
8e0b6570 LP |
690 | |
691 | rs = file_in_same_dir(path, fn); | |
692 | if (!rs) | |
693 | return -ENOMEM; | |
694 | ||
695 | return rename_noreplace(AT_FDCWD, path, AT_FDCWD, rs); | |
ebd93cb6 LP |
696 | } |
697 | ||
698 | int image_rename(Image *i, const char *new_name) { | |
8e766630 | 699 | _cleanup_(release_lock_file) LockFile global_lock = LOCK_FILE_INIT, local_lock = LOCK_FILE_INIT, name_lock = LOCK_FILE_INIT; |
bafbac4e | 700 | _cleanup_free_ char *new_path = NULL, *nn = NULL, *roothash = NULL; |
8e0b6570 | 701 | _cleanup_strv_free_ char **settings = NULL; |
01b72568 | 702 | unsigned file_attr = 0; |
8e0b6570 | 703 | char **j; |
ebd93cb6 LP |
704 | int r; |
705 | ||
706 | assert(i); | |
707 | ||
708 | if (!image_name_is_valid(new_name)) | |
709 | return -EINVAL; | |
710 | ||
d94c2b06 | 711 | if (IMAGE_IS_VENDOR(i) || IMAGE_IS_HOST(i)) |
ebd93cb6 LP |
712 | return -EROFS; |
713 | ||
8e0b6570 LP |
714 | settings = image_settings_path(i); |
715 | if (!settings) | |
716 | return -ENOMEM; | |
717 | ||
bafbac4e LP |
718 | roothash = image_roothash_path(i); |
719 | if (!roothash) | |
720 | return -ENOMEM; | |
721 | ||
30535c16 LP |
722 | /* Make sure we don't interfere with a running nspawn */ |
723 | r = image_path_lock(i->path, LOCK_EX|LOCK_NB, &global_lock, &local_lock); | |
724 | if (r < 0) | |
725 | return r; | |
726 | ||
727 | /* Make sure nobody takes the new name, between the time we | |
728 | * checked it is currently unused in all search paths, and the | |
f8e2f4d6 | 729 | * time we take possession of it */ |
30535c16 LP |
730 | r = image_name_lock(new_name, LOCK_EX|LOCK_NB, &name_lock); |
731 | if (r < 0) | |
732 | return r; | |
733 | ||
5ef46e5f | 734 | r = image_find(IMAGE_MACHINE, new_name, NULL); |
3a6ce860 | 735 | if (r >= 0) |
ebd93cb6 | 736 | return -EEXIST; |
3a6ce860 LP |
737 | if (r != -ENOENT) |
738 | return r; | |
ebd93cb6 LP |
739 | |
740 | switch (i->type) { | |
741 | ||
ebd93cb6 | 742 | case IMAGE_DIRECTORY: |
01b72568 LP |
743 | /* Turn of the immutable bit while we rename the image, so that we can rename it */ |
744 | (void) read_attr_path(i->path, &file_attr); | |
745 | ||
746 | if (file_attr & FS_IMMUTABLE_FL) | |
db9a4254 | 747 | (void) chattr_path(i->path, 0, FS_IMMUTABLE_FL, NULL); |
01b72568 | 748 | |
4831981d | 749 | _fallthrough_; |
01b72568 | 750 | case IMAGE_SUBVOLUME: |
ebd93cb6 LP |
751 | new_path = file_in_same_dir(i->path, new_name); |
752 | break; | |
753 | ||
eb38edce LP |
754 | case IMAGE_BLOCK: |
755 | ||
756 | /* Refuse renaming raw block devices in /dev, the names are picked by udev after all. */ | |
757 | if (path_startswith(i->path, "/dev")) | |
758 | return -EROFS; | |
759 | ||
760 | new_path = file_in_same_dir(i->path, new_name); | |
761 | break; | |
762 | ||
aceac2f0 | 763 | case IMAGE_RAW: { |
ebd93cb6 LP |
764 | const char *fn; |
765 | ||
63c372cb | 766 | fn = strjoina(new_name, ".raw"); |
ebd93cb6 LP |
767 | new_path = file_in_same_dir(i->path, fn); |
768 | break; | |
769 | } | |
770 | ||
771 | default: | |
15411c0c | 772 | return -EOPNOTSUPP; |
ebd93cb6 LP |
773 | } |
774 | ||
775 | if (!new_path) | |
776 | return -ENOMEM; | |
777 | ||
778 | nn = strdup(new_name); | |
779 | if (!nn) | |
780 | return -ENOMEM; | |
781 | ||
f85ef957 AC |
782 | r = rename_noreplace(AT_FDCWD, i->path, AT_FDCWD, new_path); |
783 | if (r < 0) | |
784 | return r; | |
ebd93cb6 | 785 | |
01b72568 LP |
786 | /* Restore the immutable bit, if it was set before */ |
787 | if (file_attr & FS_IMMUTABLE_FL) | |
db9a4254 | 788 | (void) chattr_path(new_path, FS_IMMUTABLE_FL, FS_IMMUTABLE_FL, NULL); |
01b72568 | 789 | |
f9ecfd3b DL |
790 | free_and_replace(i->path, new_path); |
791 | free_and_replace(i->name, nn); | |
ebd93cb6 | 792 | |
8e0b6570 | 793 | STRV_FOREACH(j, settings) { |
bafbac4e | 794 | r = rename_auxiliary_file(*j, new_name, ".nspawn"); |
8e0b6570 LP |
795 | if (r < 0 && r != -ENOENT) |
796 | log_debug_errno(r, "Failed to rename settings file %s, ignoring: %m", *j); | |
797 | } | |
798 | ||
bafbac4e LP |
799 | r = rename_auxiliary_file(roothash, new_name, ".roothash"); |
800 | if (r < 0 && r != -ENOENT) | |
801 | log_debug_errno(r, "Failed to rename roothash file %s, ignoring: %m", roothash); | |
802 | ||
ebd93cb6 LP |
803 | return 0; |
804 | } | |
805 | ||
bafbac4e | 806 | static int clone_auxiliary_file(const char *path, const char *new_name, const char *suffix) { |
8e0b6570 LP |
807 | _cleanup_free_ char *rs = NULL; |
808 | const char *fn; | |
809 | ||
bafbac4e | 810 | fn = strjoina(new_name, suffix); |
8e0b6570 LP |
811 | |
812 | rs = file_in_same_dir(path, fn); | |
813 | if (!rs) | |
814 | return -ENOMEM; | |
815 | ||
8a016c74 | 816 | return copy_file_atomic(path, rs, 0664, 0, 0, COPY_REFLINK); |
8e0b6570 LP |
817 | } |
818 | ||
ebd93cb6 | 819 | int image_clone(Image *i, const char *new_name, bool read_only) { |
8e766630 | 820 | _cleanup_(release_lock_file) LockFile name_lock = LOCK_FILE_INIT; |
8e0b6570 | 821 | _cleanup_strv_free_ char **settings = NULL; |
bafbac4e | 822 | _cleanup_free_ char *roothash = NULL; |
ebd93cb6 | 823 | const char *new_path; |
8e0b6570 | 824 | char **j; |
ebd93cb6 LP |
825 | int r; |
826 | ||
827 | assert(i); | |
828 | ||
829 | if (!image_name_is_valid(new_name)) | |
830 | return -EINVAL; | |
831 | ||
8e0b6570 LP |
832 | settings = image_settings_path(i); |
833 | if (!settings) | |
834 | return -ENOMEM; | |
835 | ||
bafbac4e LP |
836 | roothash = image_roothash_path(i); |
837 | if (!roothash) | |
838 | return -ENOMEM; | |
839 | ||
30535c16 LP |
840 | /* Make sure nobody takes the new name, between the time we |
841 | * checked it is currently unused in all search paths, and the | |
f8e2f4d6 | 842 | * time we take possession of it */ |
30535c16 LP |
843 | r = image_name_lock(new_name, LOCK_EX|LOCK_NB, &name_lock); |
844 | if (r < 0) | |
845 | return r; | |
846 | ||
5ef46e5f | 847 | r = image_find(IMAGE_MACHINE, new_name, NULL); |
3a6ce860 | 848 | if (r >= 0) |
ebd93cb6 | 849 | return -EEXIST; |
3a6ce860 LP |
850 | if (r != -ENOENT) |
851 | return r; | |
ebd93cb6 LP |
852 | |
853 | switch (i->type) { | |
854 | ||
855 | case IMAGE_SUBVOLUME: | |
856 | case IMAGE_DIRECTORY: | |
9a50e3ca | 857 | /* If we can we'll always try to create a new btrfs subvolume here, even if the source is a plain |
13e785f7 | 858 | * directory. */ |
9a50e3ca | 859 | |
63c372cb | 860 | new_path = strjoina("/var/lib/machines/", new_name); |
ebd93cb6 | 861 | |
17cbb288 LP |
862 | r = btrfs_subvol_snapshot(i->path, new_path, |
863 | (read_only ? BTRFS_SNAPSHOT_READ_ONLY : 0) | | |
864 | BTRFS_SNAPSHOT_FALLBACK_COPY | | |
865 | BTRFS_SNAPSHOT_FALLBACK_DIRECTORY | | |
866 | BTRFS_SNAPSHOT_FALLBACK_IMMUTABLE | | |
867 | BTRFS_SNAPSHOT_RECURSIVE | | |
868 | BTRFS_SNAPSHOT_QUOTA); | |
869 | if (r >= 0) | |
9a50e3ca | 870 | /* Enable "subtree" quotas for the copy, if we didn't copy any quota from the source. */ |
8120ee28 | 871 | (void) btrfs_subvol_auto_qgroup(new_path, 0, true); |
5bcd08db | 872 | |
ebd93cb6 LP |
873 | break; |
874 | ||
aceac2f0 | 875 | case IMAGE_RAW: |
63c372cb | 876 | new_path = strjoina("/var/lib/machines/", new_name, ".raw"); |
ebd93cb6 | 877 | |
8a016c74 | 878 | r = copy_file_atomic(i->path, new_path, read_only ? 0444 : 0644, FS_NOCOW_FL, FS_NOCOW_FL, COPY_REFLINK|COPY_CRTIME); |
ebd93cb6 LP |
879 | break; |
880 | ||
eb38edce | 881 | case IMAGE_BLOCK: |
ebd93cb6 | 882 | default: |
15411c0c | 883 | return -EOPNOTSUPP; |
ebd93cb6 LP |
884 | } |
885 | ||
886 | if (r < 0) | |
887 | return r; | |
888 | ||
8e0b6570 | 889 | STRV_FOREACH(j, settings) { |
bafbac4e | 890 | r = clone_auxiliary_file(*j, new_name, ".nspawn"); |
8e0b6570 LP |
891 | if (r < 0 && r != -ENOENT) |
892 | log_debug_errno(r, "Failed to clone settings %s, ignoring: %m", *j); | |
893 | } | |
894 | ||
bafbac4e LP |
895 | r = clone_auxiliary_file(roothash, new_name, ".roothash"); |
896 | if (r < 0 && r != -ENOENT) | |
897 | log_debug_errno(r, "Failed to clone root hash file %s, ignoring: %m", roothash); | |
898 | ||
ebd93cb6 LP |
899 | return 0; |
900 | } | |
901 | ||
902 | int image_read_only(Image *i, bool b) { | |
8e766630 | 903 | _cleanup_(release_lock_file) LockFile global_lock = LOCK_FILE_INIT, local_lock = LOCK_FILE_INIT; |
ebd93cb6 | 904 | int r; |
c7664c07 | 905 | |
ebd93cb6 LP |
906 | assert(i); |
907 | ||
d94c2b06 | 908 | if (IMAGE_IS_VENDOR(i) || IMAGE_IS_HOST(i)) |
ebd93cb6 LP |
909 | return -EROFS; |
910 | ||
30535c16 LP |
911 | /* Make sure we don't interfere with a running nspawn */ |
912 | r = image_path_lock(i->path, LOCK_EX|LOCK_NB, &global_lock, &local_lock); | |
913 | if (r < 0) | |
914 | return r; | |
915 | ||
ebd93cb6 LP |
916 | switch (i->type) { |
917 | ||
918 | case IMAGE_SUBVOLUME: | |
5bcd08db LP |
919 | |
920 | /* Note that we set the flag only on the top-level | |
921 | * subvolume of the image. */ | |
922 | ||
ebd93cb6 LP |
923 | r = btrfs_subvol_set_read_only(i->path, b); |
924 | if (r < 0) | |
925 | return r; | |
01b72568 LP |
926 | |
927 | break; | |
928 | ||
929 | case IMAGE_DIRECTORY: | |
930 | /* For simple directory trees we cannot use the access | |
931 | mode of the top-level directory, since it has an | |
932 | effect on the container itself. However, we can | |
933 | use the "immutable" flag, to at least make the | |
934 | top-level directory read-only. It's not as good as | |
935 | a read-only subvolume, but at least something, and | |
13e785f7 | 936 | we can read the value back. */ |
01b72568 | 937 | |
db9a4254 | 938 | r = chattr_path(i->path, b ? FS_IMMUTABLE_FL : 0, FS_IMMUTABLE_FL, NULL); |
01b72568 LP |
939 | if (r < 0) |
940 | return r; | |
941 | ||
ebd93cb6 LP |
942 | break; |
943 | ||
aceac2f0 | 944 | case IMAGE_RAW: { |
ebd93cb6 LP |
945 | struct stat st; |
946 | ||
947 | if (stat(i->path, &st) < 0) | |
948 | return -errno; | |
949 | ||
950 | if (chmod(i->path, (st.st_mode & 0444) | (b ? 0000 : 0200)) < 0) | |
951 | return -errno; | |
f2068bcc LP |
952 | |
953 | /* If the images is now read-only, it's a good time to | |
954 | * defrag it, given that no write patterns will | |
955 | * fragment it again. */ | |
956 | if (b) | |
957 | (void) btrfs_defrag(i->path); | |
ebd93cb6 LP |
958 | break; |
959 | } | |
960 | ||
eb38edce LP |
961 | case IMAGE_BLOCK: { |
962 | _cleanup_close_ int fd = -1; | |
963 | struct stat st; | |
964 | int state = b; | |
965 | ||
966 | fd = open(i->path, O_CLOEXEC|O_RDONLY|O_NONBLOCK|O_NOCTTY); | |
967 | if (fd < 0) | |
968 | return -errno; | |
969 | ||
970 | if (fstat(fd, &st) < 0) | |
971 | return -errno; | |
972 | if (!S_ISBLK(st.st_mode)) | |
973 | return -ENOTTY; | |
974 | ||
975 | if (ioctl(fd, BLKROSET, &state) < 0) | |
976 | return -errno; | |
977 | ||
978 | break; | |
979 | } | |
980 | ||
ebd93cb6 | 981 | default: |
15411c0c | 982 | return -EOPNOTSUPP; |
ebd93cb6 LP |
983 | } |
984 | ||
985 | return 0; | |
08682124 LP |
986 | } |
987 | ||
30535c16 LP |
988 | int image_path_lock(const char *path, int operation, LockFile *global, LockFile *local) { |
989 | _cleanup_free_ char *p = NULL; | |
990 | LockFile t = LOCK_FILE_INIT; | |
991 | struct stat st; | |
992 | int r; | |
993 | ||
994 | assert(path); | |
995 | assert(global); | |
996 | assert(local); | |
997 | ||
998 | /* Locks an image path. This actually creates two locks: one | |
999 | * "local" one, next to the image path itself, which might be | |
1000 | * shared via NFS. And another "global" one, in /run, that | |
1001 | * uses the device/inode number. This has the benefit that we | |
1002 | * can even lock a tree that is a mount point, correctly. */ | |
1003 | ||
30535c16 LP |
1004 | if (!path_is_absolute(path)) |
1005 | return -EINVAL; | |
1006 | ||
b6e953f2 LP |
1007 | if (getenv_bool("SYSTEMD_NSPAWN_LOCK") == 0) { |
1008 | *local = *global = (LockFile) LOCK_FILE_INIT; | |
1009 | return 0; | |
1010 | } | |
1011 | ||
1012 | if (path_equal(path, "/")) | |
1013 | return -EBUSY; | |
1014 | ||
30535c16 | 1015 | if (stat(path, &st) >= 0) { |
eb38edce LP |
1016 | if (S_ISBLK(st.st_mode)) |
1017 | r = asprintf(&p, "/run/systemd/nspawn/locks/block-%u:%u", major(st.st_rdev), minor(st.st_rdev)); | |
1018 | else if (S_ISDIR(st.st_mode) || S_ISREG(st.st_mode)) | |
1019 | r = asprintf(&p, "/run/systemd/nspawn/locks/inode-%lu:%lu", (unsigned long) st.st_dev, (unsigned long) st.st_ino); | |
1020 | else | |
1021 | return -ENOTTY; | |
1022 | ||
1023 | if (r < 0) | |
30535c16 LP |
1024 | return -ENOMEM; |
1025 | } | |
1026 | ||
eb38edce LP |
1027 | /* For block devices we don't need the "local" lock, as the major/minor lock above should be sufficient, since |
1028 | * block devices are device local anyway. */ | |
1029 | if (!path_startswith(path, "/dev")) { | |
1030 | r = make_lock_file_for(path, operation, &t); | |
8be17c9b LT |
1031 | if (r < 0) { |
1032 | if ((operation & LOCK_SH) && r == -EROFS) | |
771b7ead | 1033 | log_debug_errno(r, "Failed to create shared lock for '%s', ignoring: %m", path); |
8be17c9b LT |
1034 | else |
1035 | return r; | |
1036 | } | |
eb38edce | 1037 | } |
30535c16 LP |
1038 | |
1039 | if (p) { | |
6e5dcce4 | 1040 | (void) mkdir_p("/run/systemd/nspawn/locks", 0700); |
30535c16 LP |
1041 | |
1042 | r = make_lock_file(p, operation, global); | |
1043 | if (r < 0) { | |
1044 | release_lock_file(&t); | |
1045 | return r; | |
1046 | } | |
546dbec5 LP |
1047 | } else |
1048 | *global = (LockFile) LOCK_FILE_INIT; | |
30535c16 LP |
1049 | |
1050 | *local = t; | |
1051 | return 0; | |
1052 | } | |
1053 | ||
cb81cd80 | 1054 | int image_set_limit(Image *i, uint64_t referenced_max) { |
d6ce17c7 LP |
1055 | assert(i); |
1056 | ||
d94c2b06 | 1057 | if (IMAGE_IS_VENDOR(i) || IMAGE_IS_HOST(i)) |
d6ce17c7 LP |
1058 | return -EROFS; |
1059 | ||
1060 | if (i->type != IMAGE_SUBVOLUME) | |
15411c0c | 1061 | return -EOPNOTSUPP; |
d6ce17c7 | 1062 | |
5bcd08db LP |
1063 | /* We set the quota both for the subvolume as well as for the |
1064 | * subtree. The latter is mostly for historical reasons, since | |
1065 | * we didn't use to have a concept of subtree quota, and hence | |
1066 | * only modified the subvolume quota. */ | |
1067 | ||
1068 | (void) btrfs_qgroup_set_limit(i->path, 0, referenced_max); | |
1069 | (void) btrfs_subvol_auto_qgroup(i->path, 0, true); | |
1070 | return btrfs_subvol_set_subtree_quota_limit(i->path, 0, referenced_max); | |
d6ce17c7 LP |
1071 | } |
1072 | ||
c7664c07 | 1073 | int image_read_metadata(Image *i) { |
8e766630 | 1074 | _cleanup_(release_lock_file) LockFile global_lock = LOCK_FILE_INIT, local_lock = LOCK_FILE_INIT; |
c7664c07 LP |
1075 | int r; |
1076 | ||
1077 | assert(i); | |
1078 | ||
1079 | r = image_path_lock(i->path, LOCK_SH|LOCK_NB, &global_lock, &local_lock); | |
1080 | if (r < 0) | |
1081 | return r; | |
1082 | ||
1083 | switch (i->type) { | |
1084 | ||
1085 | case IMAGE_SUBVOLUME: | |
1086 | case IMAGE_DIRECTORY: { | |
1087 | _cleanup_strv_free_ char **machine_info = NULL, **os_release = NULL; | |
1088 | sd_id128_t machine_id = SD_ID128_NULL; | |
1089 | _cleanup_free_ char *hostname = NULL; | |
1090 | _cleanup_free_ char *path = NULL; | |
1091 | ||
62570f6f | 1092 | r = chase_symlinks("/etc/hostname", i->path, CHASE_PREFIX_ROOT|CHASE_TRAIL_SLASH, &path); |
c7664c07 LP |
1093 | if (r < 0 && r != -ENOENT) |
1094 | log_debug_errno(r, "Failed to chase /etc/hostname in image %s: %m", i->name); | |
1095 | else if (r >= 0) { | |
1096 | r = read_etc_hostname(path, &hostname); | |
1097 | if (r < 0) | |
1098 | log_debug_errno(errno, "Failed to read /etc/hostname of image %s: %m", i->name); | |
1099 | } | |
1100 | ||
1101 | path = mfree(path); | |
1102 | ||
62570f6f | 1103 | r = chase_symlinks("/etc/machine-id", i->path, CHASE_PREFIX_ROOT|CHASE_TRAIL_SLASH, &path); |
c7664c07 LP |
1104 | if (r < 0 && r != -ENOENT) |
1105 | log_debug_errno(r, "Failed to chase /etc/machine-id in image %s: %m", i->name); | |
1106 | else if (r >= 0) { | |
1107 | _cleanup_close_ int fd = -1; | |
1108 | ||
1109 | fd = open(path, O_RDONLY|O_CLOEXEC|O_NOCTTY); | |
1110 | if (fd < 0) | |
1111 | log_debug_errno(errno, "Failed to open %s: %m", path); | |
1112 | else { | |
1113 | r = id128_read_fd(fd, ID128_PLAIN, &machine_id); | |
1114 | if (r < 0) | |
1115 | log_debug_errno(r, "Image %s contains invalid machine ID.", i->name); | |
1116 | } | |
1117 | } | |
1118 | ||
1119 | path = mfree(path); | |
1120 | ||
62570f6f | 1121 | r = chase_symlinks("/etc/machine-info", i->path, CHASE_PREFIX_ROOT|CHASE_TRAIL_SLASH, &path); |
c7664c07 LP |
1122 | if (r < 0 && r != -ENOENT) |
1123 | log_debug_errno(r, "Failed to chase /etc/machine-info in image %s: %m", i->name); | |
1124 | else if (r >= 0) { | |
aa8fbc74 | 1125 | r = load_env_file_pairs(NULL, path, &machine_info); |
c7664c07 LP |
1126 | if (r < 0) |
1127 | log_debug_errno(r, "Failed to parse machine-info data of %s: %m", i->name); | |
1128 | } | |
1129 | ||
d58ad743 LP |
1130 | r = load_os_release_pairs(i->path, &os_release); |
1131 | if (r < 0) | |
1132 | log_debug_errno(r, "Failed to read os-release in image, ignoring: %m"); | |
c7664c07 LP |
1133 | |
1134 | free_and_replace(i->hostname, hostname); | |
1135 | i->machine_id = machine_id; | |
1136 | strv_free_and_replace(i->machine_info, machine_info); | |
1137 | strv_free_and_replace(i->os_release, os_release); | |
1138 | ||
1139 | break; | |
1140 | } | |
1141 | ||
1142 | case IMAGE_RAW: | |
1143 | case IMAGE_BLOCK: { | |
1144 | _cleanup_(loop_device_unrefp) LoopDevice *d = NULL; | |
1145 | _cleanup_(dissected_image_unrefp) DissectedImage *m = NULL; | |
1146 | ||
1147 | r = loop_device_make_by_path(i->path, O_RDONLY, &d); | |
1148 | if (r < 0) | |
1149 | return r; | |
1150 | ||
1151 | r = dissect_image(d->fd, NULL, 0, DISSECT_IMAGE_REQUIRE_ROOT, &m); | |
1152 | if (r < 0) | |
1153 | return r; | |
1154 | ||
1155 | r = dissected_image_acquire_metadata(m); | |
1156 | if (r < 0) | |
1157 | return r; | |
1158 | ||
1159 | free_and_replace(i->hostname, m->hostname); | |
1160 | i->machine_id = m->machine_id; | |
1161 | strv_free_and_replace(i->machine_info, m->machine_info); | |
1162 | strv_free_and_replace(i->os_release, m->os_release); | |
1163 | ||
1164 | break; | |
1165 | } | |
1166 | ||
1167 | default: | |
1168 | return -EOPNOTSUPP; | |
1169 | } | |
1170 | ||
1171 | i->metadata_valid = true; | |
1172 | ||
1173 | return 0; | |
1174 | } | |
1175 | ||
30535c16 | 1176 | int image_name_lock(const char *name, int operation, LockFile *ret) { |
30535c16 LP |
1177 | assert(name); |
1178 | assert(ret); | |
1179 | ||
1180 | /* Locks an image name, regardless of the precise path used. */ | |
1181 | ||
1182 | if (!image_name_is_valid(name)) | |
1183 | return -EINVAL; | |
1184 | ||
b6e953f2 LP |
1185 | if (getenv_bool("SYSTEMD_NSPAWN_LOCK") == 0) { |
1186 | *ret = (LockFile) LOCK_FILE_INIT; | |
1187 | return 0; | |
1188 | } | |
1189 | ||
30535c16 LP |
1190 | if (streq(name, ".host")) |
1191 | return -EBUSY; | |
1192 | ||
6e5dcce4 ZJS |
1193 | const char *p = strjoina("/run/systemd/nspawn/locks/name-", name); |
1194 | (void) mkdir_p("/run/systemd/nspawn/locks", 0700); | |
30535c16 LP |
1195 | return make_lock_file(p, operation, ret); |
1196 | } | |
1197 | ||
1198 | bool image_name_is_valid(const char *s) { | |
1199 | if (!filename_is_valid(s)) | |
1200 | return false; | |
1201 | ||
1202 | if (string_has_cc(s, NULL)) | |
1203 | return false; | |
1204 | ||
1205 | if (!utf8_is_valid(s)) | |
1206 | return false; | |
1207 | ||
1208 | /* Temporary files for atomically creating new files */ | |
1209 | if (startswith(s, ".#")) | |
1210 | return false; | |
1211 | ||
1212 | return true; | |
1213 | } | |
1214 | ||
ace9ab19 LP |
1215 | bool image_in_search_path(ImageClass class, const char *image) { |
1216 | const char *path; | |
1217 | ||
1218 | assert(image); | |
1219 | ||
1220 | NULSTR_FOREACH(path, image_search_path[class]) { | |
1221 | const char *p; | |
1222 | size_t k; | |
1223 | ||
1224 | p = path_startswith(image, path); | |
1225 | if (!p) | |
1226 | continue; | |
1227 | ||
1228 | /* Make sure there's a filename following */ | |
1229 | k = strcspn(p, "/"); | |
1230 | if (k == 0) | |
1231 | continue; | |
1232 | ||
1233 | p += k; | |
1234 | ||
1235 | /* Accept trailing slashes */ | |
1236 | if (p[strspn(p, "/")] == 0) | |
1237 | return true; | |
1238 | ||
1239 | } | |
1240 | ||
1241 | return false; | |
1242 | } | |
1243 | ||
cd61c3bf LP |
1244 | static const char* const image_type_table[_IMAGE_TYPE_MAX] = { |
1245 | [IMAGE_DIRECTORY] = "directory", | |
1246 | [IMAGE_SUBVOLUME] = "subvolume", | |
aceac2f0 | 1247 | [IMAGE_RAW] = "raw", |
eb38edce | 1248 | [IMAGE_BLOCK] = "block", |
cd61c3bf LP |
1249 | }; |
1250 | ||
1251 | DEFINE_STRING_TABLE_LOOKUP(image_type, ImageType); |