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Commit | Line | Data |
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db9ecf05 | 1 | /* SPDX-License-Identifier: LGPL-2.1-or-later */ |
cd61c3bf | 2 | |
a8fbdf54 | 3 | #include <errno.h> |
ebd93cb6 | 4 | #include <fcntl.h> |
e08f94ac LP |
5 | #include <linux/fs.h> |
6 | #include <linux/loop.h> | |
65ddc2c5 | 7 | #include <linux/magic.h> |
a8fbdf54 TA |
8 | #include <stdio.h> |
9 | #include <stdlib.h> | |
e306723e | 10 | #include <sys/file.h> |
204f52e3 | 11 | #include <sys/ioctl.h> |
a8fbdf54 TA |
12 | #include <sys/stat.h> |
13 | #include <unistd.h> | |
546dbec5 | 14 | |
b5efdb8a | 15 | #include "alloc-util.h" |
01db9c85 | 16 | #include "blockdev-util.h" |
cd61c3bf | 17 | #include "btrfs-util.h" |
f461a28d | 18 | #include "chase.h" |
c8b3094d | 19 | #include "chattr-util.h" |
ebd93cb6 | 20 | #include "copy.h" |
a0956174 | 21 | #include "dirent-util.h" |
57f1b61b | 22 | #include "discover-image.h" |
c7664c07 | 23 | #include "dissect-image.h" |
686d13b9 | 24 | #include "env-file.h" |
b6e953f2 | 25 | #include "env-util.h" |
6afa5d86 | 26 | #include "extension-util.h" |
3ffd4af2 | 27 | #include "fd-util.h" |
f4f15635 | 28 | #include "fs-util.h" |
a8fbdf54 | 29 | #include "hashmap.h" |
e2054217 | 30 | #include "hostname-setup.h" |
c7664c07 | 31 | #include "id128-util.h" |
73740c9f | 32 | #include "initrd-util.h" |
64e89f56 | 33 | #include "lock-util.h" |
a8fbdf54 | 34 | #include "log.h" |
c7664c07 | 35 | #include "loop-util.h" |
546dbec5 | 36 | #include "macro.h" |
30535c16 | 37 | #include "mkdir.h" |
d8b4d14d | 38 | #include "nulstr-util.h" |
d58ad743 | 39 | #include "os-util.h" |
8e0b6570 | 40 | #include "path-util.h" |
c6878637 | 41 | #include "rm-rf.h" |
65ddc2c5 | 42 | #include "stat-util.h" |
8b43440b | 43 | #include "string-table.h" |
07630cea | 44 | #include "string-util.h" |
8e0b6570 | 45 | #include "strv.h" |
a8fbdf54 | 46 | #include "time-util.h" |
8e0b6570 | 47 | #include "utf8.h" |
89a5a90c | 48 | #include "xattr-util.h" |
cd61c3bf | 49 | |
5ef46e5f | 50 | static const char* const image_search_path[_IMAGE_CLASS_MAX] = { |
9bca4ae4 LP |
51 | [IMAGE_MACHINE] = "/etc/machines\0" /* only place symlinks here */ |
52 | "/run/machines\0" /* and here too */ | |
53 | "/var/lib/machines\0" /* the main place for images */ | |
54 | "/var/lib/container\0" /* legacy */ | |
55 | "/usr/local/lib/machines\0" | |
56 | "/usr/lib/machines\0", | |
5ef46e5f | 57 | |
9bca4ae4 LP |
58 | [IMAGE_PORTABLE] = "/etc/portables\0" /* only place symlinks here */ |
59 | "/run/portables\0" /* and here too */ | |
60 | "/var/lib/portables\0" /* the main place for images */ | |
61 | "/usr/local/lib/portables\0" | |
62 | "/usr/lib/portables\0", | |
63 | ||
de862276 LB |
64 | /* Note that we don't allow storing extensions under /usr/, unlike with other image types. That's |
65 | * because extension images are supposed to extend /usr/, so you get into recursive races, especially | |
66 | * with directory-based extensions, as the kernel's OverlayFS explicitly checks for this and errors | |
67 | * out with -ELOOP if it finds that a lowerdir= is a child of another lowerdir=. */ | |
b60e0f57 | 68 | [IMAGE_SYSEXT] = "/etc/extensions\0" /* only place symlinks here */ |
69 | "/run/extensions\0" /* and here too */ | |
70 | "/var/lib/extensions\0", /* the main place for images */ | |
71 | ||
72 | [IMAGE_CONFEXT] = "/run/confexts\0" /* only place symlinks here */ | |
73 | "/var/lib/confexts\0" /* the main place for images */ | |
74 | "/usr/local/lib/confexts\0" | |
75 | "/usr/lib/confexts\0", | |
5ef46e5f | 76 | }; |
c2ce6a3d | 77 | |
d4fee894 LP |
78 | /* Inside the initrd, use a slightly different set of search path (i.e. include .extra/sysext/ and |
79 | * .extra/confext/ in extension search dir) */ | |
73740c9f LP |
80 | static const char* const image_search_path_initrd[_IMAGE_CLASS_MAX] = { |
81 | /* (entries that aren't listed here will get the same search path as for the non initrd-case) */ | |
82 | ||
b151e696 LP |
83 | [IMAGE_SYSEXT] = "/etc/extensions\0" /* only place symlinks here */ |
84 | "/run/extensions\0" /* and here too */ | |
85 | "/var/lib/extensions\0" /* the main place for images */ | |
d4fee894 LP |
86 | "/.extra/sysext\0", /* put sysext picked up by systemd-stub last, since not trusted */ |
87 | ||
88 | [IMAGE_CONFEXT] = "/run/confexts\0" /* only place symlinks here */ | |
89 | "/var/lib/confexts\0" /* the main place for images */ | |
90 | "/usr/local/lib/confexts\0" | |
91 | "/.extra/confext\0", /* put confext picked up by systemd-stub last, since not trusted */ | |
73740c9f LP |
92 | }; |
93 | ||
a747994b LP |
94 | static const char* image_class_suffix_table[_IMAGE_CLASS_MAX] = { |
95 | [IMAGE_SYSEXT] = ".sysext", | |
96 | [IMAGE_CONFEXT] = ".confext", | |
97 | }; | |
98 | ||
99 | DEFINE_PRIVATE_STRING_TABLE_LOOKUP_TO_STRING(image_class_suffix, ImageClass); | |
100 | ||
8301aa0b YW |
101 | static Image *image_free(Image *i) { |
102 | assert(i); | |
9614bb06 | 103 | |
cd61c3bf LP |
104 | free(i->name); |
105 | free(i->path); | |
c7664c07 LP |
106 | |
107 | free(i->hostname); | |
108 | strv_free(i->machine_info); | |
109 | strv_free(i->os_release); | |
a81fe93e LP |
110 | strv_free(i->sysext_release); |
111 | strv_free(i->confext_release); | |
c7664c07 | 112 | |
6b430fdb | 113 | return mfree(i); |
cd61c3bf LP |
114 | } |
115 | ||
8301aa0b | 116 | DEFINE_TRIVIAL_REF_UNREF_FUNC(Image, image, image_free); |
b07ec5a1 YW |
117 | DEFINE_HASH_OPS_WITH_VALUE_DESTRUCTOR(image_hash_ops, char, string_hash_func, string_compare_func, |
118 | Image, image_unref); | |
9614bb06 | 119 | |
8e0b6570 LP |
120 | static char **image_settings_path(Image *image) { |
121 | _cleanup_strv_free_ char **l = NULL; | |
162f6477 LP |
122 | _cleanup_free_ char *fn = NULL; |
123 | size_t i = 0; | |
124 | int r; | |
8e0b6570 LP |
125 | |
126 | assert(image); | |
127 | ||
128 | l = new0(char*, 4); | |
129 | if (!l) | |
130 | return NULL; | |
131 | ||
162f6477 LP |
132 | fn = strjoin(image->name, ".nspawn"); |
133 | if (!fn) | |
134 | return NULL; | |
8e0b6570 | 135 | |
b910cc72 LP |
136 | FOREACH_STRING(s, "/etc/systemd/nspawn", "/run/systemd/nspawn") { |
137 | l[i] = path_join(s, fn); | |
8e0b6570 LP |
138 | if (!l[i]) |
139 | return NULL; | |
140 | ||
141 | i++; | |
142 | } | |
143 | ||
162f6477 LP |
144 | r = file_in_same_dir(image->path, fn, l + i); |
145 | if (r == -ENOMEM) | |
8e0b6570 | 146 | return NULL; |
162f6477 LP |
147 | if (r < 0) |
148 | log_debug_errno(r, "Failed to generate .nspawn settings path from image path, ignoring: %m"); | |
149 | ||
150 | strv_uniq(l); | |
8e0b6570 | 151 | |
ae2a15bc | 152 | return TAKE_PTR(l); |
8e0b6570 LP |
153 | } |
154 | ||
162f6477 LP |
155 | static int image_roothash_path(Image *image, char **ret) { |
156 | _cleanup_free_ char *fn = NULL; | |
bafbac4e LP |
157 | |
158 | assert(image); | |
159 | ||
162f6477 LP |
160 | fn = strjoin(image->name, ".roothash"); |
161 | if (!fn) | |
162 | return -ENOMEM; | |
bafbac4e | 163 | |
162f6477 | 164 | return file_in_same_dir(image->path, fn, ret); |
bafbac4e LP |
165 | } |
166 | ||
c2ce6a3d | 167 | static int image_new( |
cd61c3bf | 168 | ImageType t, |
3775e141 | 169 | ImageClass c, |
5fc7f358 | 170 | const char *pretty, |
cd61c3bf | 171 | const char *path, |
5fc7f358 | 172 | const char *filename, |
cd61c3bf | 173 | bool read_only, |
10f9c755 | 174 | usec_t crtime, |
cd61c3bf | 175 | usec_t mtime, |
c2ce6a3d | 176 | Image **ret) { |
cd61c3bf LP |
177 | |
178 | _cleanup_(image_unrefp) Image *i = NULL; | |
cd61c3bf | 179 | |
cd61c3bf LP |
180 | assert(t >= 0); |
181 | assert(t < _IMAGE_TYPE_MAX); | |
5fc7f358 LP |
182 | assert(pretty); |
183 | assert(filename); | |
c2ce6a3d | 184 | assert(ret); |
cd61c3bf | 185 | |
c2108701 | 186 | i = new(Image, 1); |
cd61c3bf LP |
187 | if (!i) |
188 | return -ENOMEM; | |
189 | ||
c2108701 LP |
190 | *i = (Image) { |
191 | .n_ref = 1, | |
192 | .type = t, | |
3775e141 | 193 | .class = c, |
c2108701 LP |
194 | .read_only = read_only, |
195 | .crtime = crtime, | |
196 | .mtime = mtime, | |
197 | .usage = UINT64_MAX, | |
198 | .usage_exclusive = UINT64_MAX, | |
199 | .limit = UINT64_MAX, | |
200 | .limit_exclusive = UINT64_MAX, | |
201 | }; | |
cd61c3bf | 202 | |
5fc7f358 | 203 | i->name = strdup(pretty); |
cd61c3bf LP |
204 | if (!i->name) |
205 | return -ENOMEM; | |
206 | ||
657ee2d8 | 207 | i->path = path_join(path, filename); |
5fc7f358 LP |
208 | if (!i->path) |
209 | return -ENOMEM; | |
210 | ||
4ff361cc | 211 | path_simplify(i->path); |
cd61c3bf | 212 | |
1cc6c93a | 213 | *ret = TAKE_PTR(i); |
c2ce6a3d | 214 | |
cd61c3bf LP |
215 | return 0; |
216 | } | |
217 | ||
a747994b LP |
218 | static int extract_pretty( |
219 | const char *path, | |
220 | const char *class_suffix, | |
221 | const char *format_suffix, | |
222 | char **ret) { | |
223 | ||
4756c94e | 224 | _cleanup_free_ char *name = NULL; |
a747994b | 225 | int r; |
4756c94e LP |
226 | |
227 | assert(path); | |
228 | assert(ret); | |
229 | ||
a747994b LP |
230 | r = path_extract_filename(path, &name); |
231 | if (r < 0) | |
232 | return r; | |
4756c94e | 233 | |
a747994b LP |
234 | if (format_suffix) { |
235 | char *e = endswith(name, format_suffix); | |
236 | if (!e) /* Format suffix is required */ | |
4756c94e LP |
237 | return -EINVAL; |
238 | ||
239 | *e = 0; | |
240 | } | |
241 | ||
a747994b LP |
242 | if (class_suffix) { |
243 | char *e = endswith(name, class_suffix); | |
244 | if (e) /* Class suffix is optional */ | |
245 | *e = 0; | |
246 | } | |
247 | ||
4756c94e LP |
248 | if (!image_name_is_valid(name)) |
249 | return -EINVAL; | |
250 | ||
251 | *ret = TAKE_PTR(name); | |
252 | return 0; | |
253 | } | |
254 | ||
5fc7f358 | 255 | static int image_make( |
3775e141 | 256 | ImageClass c, |
5fc7f358 LP |
257 | const char *pretty, |
258 | int dfd, | |
259 | const char *path, | |
260 | const char *filename, | |
3a6ce860 | 261 | const struct stat *st, |
5fc7f358 LP |
262 | Image **ret) { |
263 | ||
2570578d | 264 | _cleanup_free_ char *pretty_buffer = NULL, *parent = NULL; |
3a6ce860 | 265 | struct stat stbuf; |
5fc7f358 | 266 | bool read_only; |
cd61c3bf LP |
267 | int r; |
268 | ||
3a6ce860 | 269 | assert(dfd >= 0 || dfd == AT_FDCWD); |
bcb846f3 | 270 | assert(path || dfd == AT_FDCWD); |
5fc7f358 | 271 | assert(filename); |
cd61c3bf | 272 | |
eb38edce | 273 | /* We explicitly *do* follow symlinks here, since we want to allow symlinking trees, raw files and block |
3a6ce860 LP |
274 | * devices into /var/lib/machines/, and treat them normally. |
275 | * | |
276 | * This function returns -ENOENT if we can't find the image after all, and -EMEDIUMTYPE if it's not a file we | |
277 | * recognize. */ | |
cd61c3bf | 278 | |
3a6ce860 LP |
279 | if (!st) { |
280 | if (fstatat(dfd, filename, &stbuf, 0) < 0) | |
281 | return -errno; | |
282 | ||
283 | st = &stbuf; | |
284 | } | |
cd61c3bf | 285 | |
2570578d LP |
286 | if (!path) { |
287 | if (dfd == AT_FDCWD) | |
288 | (void) safe_getcwd(&parent); | |
289 | else | |
290 | (void) fd_get_path(dfd, &parent); | |
291 | } | |
bcb846f3 | 292 | |
5fc7f358 LP |
293 | read_only = |
294 | (path && path_startswith(path, "/usr")) || | |
08ff5529 | 295 | (faccessat(dfd, filename, W_OK, AT_EACCESS) < 0 && errno == EROFS); |
86e339c8 | 296 | |
3a6ce860 | 297 | if (S_ISDIR(st->st_mode)) { |
254d1313 | 298 | _cleanup_close_ int fd = -EBADF; |
01b72568 | 299 | unsigned file_attr = 0; |
02dcf215 | 300 | usec_t crtime = 0; |
cd61c3bf | 301 | |
c2ce6a3d | 302 | if (!ret) |
3a6ce860 | 303 | return 0; |
cd61c3bf | 304 | |
4756c94e | 305 | if (!pretty) { |
a747994b | 306 | r = extract_pretty(filename, image_class_suffix_to_string(c), NULL, &pretty_buffer); |
4756c94e LP |
307 | if (r < 0) |
308 | return r; | |
309 | ||
310 | pretty = pretty_buffer; | |
311 | } | |
5fc7f358 | 312 | |
01b72568 LP |
313 | fd = openat(dfd, filename, O_CLOEXEC|O_NOCTTY|O_DIRECTORY); |
314 | if (fd < 0) | |
315 | return -errno; | |
316 | ||
674b04ff | 317 | if (btrfs_might_be_subvol(st)) { |
cd61c3bf | 318 | |
65ddc2c5 | 319 | r = fd_is_fs_type(fd, BTRFS_SUPER_MAGIC); |
21222ea5 LP |
320 | if (r < 0) |
321 | return r; | |
79de6eb1 | 322 | if (r > 0) { |
10f9c755 | 323 | BtrfsSubvolInfo info; |
cd61c3bf | 324 | |
c2ce6a3d | 325 | /* It's a btrfs subvolume */ |
cd61c3bf | 326 | |
5bcd08db | 327 | r = btrfs_subvol_get_info_fd(fd, 0, &info); |
10f9c755 LP |
328 | if (r < 0) |
329 | return r; | |
c2ce6a3d LP |
330 | |
331 | r = image_new(IMAGE_SUBVOLUME, | |
3775e141 | 332 | c, |
5fc7f358 | 333 | pretty, |
c2ce6a3d | 334 | path, |
5fc7f358 LP |
335 | filename, |
336 | info.read_only || read_only, | |
10f9c755 | 337 | info.otime, |
c2ce6a3d | 338 | 0, |
c2ce6a3d LP |
339 | ret); |
340 | if (r < 0) | |
341 | return r; | |
342 | ||
5bcd08db LP |
343 | if (btrfs_quota_scan_ongoing(fd) == 0) { |
344 | BtrfsQuotaInfo quota; | |
b6b18498 | 345 | |
5bcd08db LP |
346 | r = btrfs_subvol_get_subtree_quota_fd(fd, 0, "a); |
347 | if (r >= 0) { | |
348 | (*ret)->usage = quota.referenced; | |
349 | (*ret)->usage_exclusive = quota.exclusive; | |
350 | ||
351 | (*ret)->limit = quota.referenced_max; | |
352 | (*ret)->limit_exclusive = quota.exclusive_max; | |
353 | } | |
b6b18498 LP |
354 | } |
355 | ||
3a6ce860 | 356 | return 0; |
cd61c3bf | 357 | } |
c2ce6a3d | 358 | } |
cd61c3bf | 359 | |
02dcf215 | 360 | /* Get directory creation time (not available everywhere, but that's OK */ |
12a7f04a | 361 | (void) fd_getcrtime(fd, &crtime); |
02dcf215 LP |
362 | |
363 | /* If the IMMUTABLE bit is set, we consider the directory read-only. Since the ioctl is not | |
01b72568 LP |
364 | * supported everywhere we ignore failures. */ |
365 | (void) read_attr_fd(fd, &file_attr); | |
cd61c3bf | 366 | |
01b72568 | 367 | /* It's just a normal directory. */ |
c2ce6a3d | 368 | r = image_new(IMAGE_DIRECTORY, |
3775e141 | 369 | c, |
5fc7f358 | 370 | pretty, |
c2ce6a3d | 371 | path, |
5fc7f358 | 372 | filename, |
01b72568 | 373 | read_only || (file_attr & FS_IMMUTABLE_FL), |
02dcf215 LP |
374 | crtime, |
375 | 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 |
376 | ret); |
377 | if (r < 0) | |
378 | return r; | |
cd61c3bf | 379 | |
3a6ce860 | 380 | return 0; |
cd61c3bf | 381 | |
3a6ce860 | 382 | } else if (S_ISREG(st->st_mode) && endswith(filename, ".raw")) { |
10f9c755 | 383 | usec_t crtime = 0; |
cd61c3bf | 384 | |
aceac2f0 | 385 | /* It's a RAW disk image */ |
cd61c3bf | 386 | |
c2ce6a3d | 387 | if (!ret) |
3a6ce860 | 388 | return 0; |
cd61c3bf | 389 | |
c53e07e2 | 390 | (void) fd_getcrtime_at(dfd, filename, AT_SYMLINK_FOLLOW, &crtime); |
10f9c755 | 391 | |
4756c94e | 392 | if (!pretty) { |
a747994b | 393 | r = extract_pretty(filename, image_class_suffix_to_string(c), ".raw", &pretty_buffer); |
4756c94e LP |
394 | if (r < 0) |
395 | return r; | |
396 | ||
397 | pretty = pretty_buffer; | |
398 | } | |
10f9c755 | 399 | |
aceac2f0 | 400 | r = image_new(IMAGE_RAW, |
3775e141 | 401 | c, |
5fc7f358 | 402 | pretty, |
c2ce6a3d | 403 | path, |
5fc7f358 | 404 | filename, |
3a6ce860 | 405 | !(st->st_mode & 0222) || read_only, |
10f9c755 | 406 | crtime, |
3a6ce860 | 407 | timespec_load(&st->st_mtim), |
c2ce6a3d LP |
408 | ret); |
409 | if (r < 0) | |
410 | return r; | |
cd61c3bf | 411 | |
3a6ce860 LP |
412 | (*ret)->usage = (*ret)->usage_exclusive = st->st_blocks * 512; |
413 | (*ret)->limit = (*ret)->limit_exclusive = st->st_size; | |
b6b18498 | 414 | |
3a6ce860 | 415 | return 0; |
eb38edce | 416 | |
3a6ce860 | 417 | } else if (S_ISBLK(st->st_mode)) { |
254d1313 | 418 | _cleanup_close_ int block_fd = -EBADF; |
eb38edce LP |
419 | uint64_t size = UINT64_MAX; |
420 | ||
421 | /* A block device */ | |
422 | ||
423 | if (!ret) | |
3a6ce860 | 424 | return 0; |
eb38edce | 425 | |
4756c94e | 426 | if (!pretty) { |
a747994b | 427 | r = extract_pretty(filename, NULL, NULL, &pretty_buffer); |
4756c94e LP |
428 | if (r < 0) |
429 | return r; | |
430 | ||
431 | pretty = pretty_buffer; | |
432 | } | |
eb38edce LP |
433 | |
434 | block_fd = openat(dfd, filename, O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_NOCTTY); | |
435 | if (block_fd < 0) | |
2570578d | 436 | log_debug_errno(errno, "Failed to open block device %s/%s, ignoring: %m", path ?: strnull(parent), filename); |
eb38edce | 437 | else { |
3a6ce860 LP |
438 | /* Refresh stat data after opening the node */ |
439 | if (fstat(block_fd, &stbuf) < 0) | |
eb38edce | 440 | return -errno; |
3a6ce860 LP |
441 | st = &stbuf; |
442 | ||
443 | if (!S_ISBLK(st->st_mode)) /* Verify that what we opened is actually what we think it is */ | |
eb38edce LP |
444 | return -ENOTTY; |
445 | ||
446 | if (!read_only) { | |
447 | int state = 0; | |
448 | ||
449 | if (ioctl(block_fd, BLKROGET, &state) < 0) | |
2570578d | 450 | log_debug_errno(errno, "Failed to issue BLKROGET on device %s/%s, ignoring: %m", path ?: strnull(parent), filename); |
eb38edce LP |
451 | else if (state) |
452 | read_only = true; | |
453 | } | |
454 | ||
01db9c85 LP |
455 | r = blockdev_get_device_size(block_fd, &size); |
456 | if (r < 0) | |
457 | log_debug_errno(r, "Failed to issue BLKGETSIZE64 on device %s/%s, ignoring: %m", path ?: strnull(parent), filename); | |
eb38edce LP |
458 | |
459 | block_fd = safe_close(block_fd); | |
460 | } | |
461 | ||
462 | r = image_new(IMAGE_BLOCK, | |
3775e141 | 463 | c, |
eb38edce LP |
464 | pretty, |
465 | path, | |
466 | filename, | |
3a6ce860 | 467 | !(st->st_mode & 0222) || read_only, |
eb38edce LP |
468 | 0, |
469 | 0, | |
470 | ret); | |
471 | if (r < 0) | |
472 | return r; | |
473 | ||
ed0cb346 | 474 | if (!IN_SET(size, 0, UINT64_MAX)) |
eb38edce LP |
475 | (*ret)->usage = (*ret)->usage_exclusive = (*ret)->limit = (*ret)->limit_exclusive = size; |
476 | ||
3a6ce860 | 477 | return 0; |
c2ce6a3d | 478 | } |
cd61c3bf | 479 | |
3a6ce860 | 480 | return -EMEDIUMTYPE; |
c2ce6a3d | 481 | } |
cd61c3bf | 482 | |
73740c9f LP |
483 | static const char *pick_image_search_path(ImageClass class) { |
484 | if (class < 0 || class >= _IMAGE_CLASS_MAX) | |
485 | return NULL; | |
486 | ||
487 | /* Use the initrd search path if there is one, otherwise use the common one */ | |
488 | return in_initrd() && image_search_path_initrd[class] ? image_search_path_initrd[class] : image_search_path[class]; | |
489 | } | |
490 | ||
d577d4a4 LP |
491 | int image_find(ImageClass class, |
492 | const char *name, | |
493 | const char *root, | |
494 | Image **ret) { | |
495 | ||
c2ce6a3d | 496 | int r; |
cd61c3bf | 497 | |
5ef46e5f LP |
498 | assert(class >= 0); |
499 | assert(class < _IMAGE_CLASS_MAX); | |
c2ce6a3d | 500 | assert(name); |
cd61c3bf | 501 | |
c2ce6a3d LP |
502 | /* There are no images with invalid names */ |
503 | if (!image_name_is_valid(name)) | |
3a6ce860 | 504 | return -ENOENT; |
cd61c3bf | 505 | |
73740c9f | 506 | NULSTR_FOREACH(path, pick_image_search_path(class)) { |
d577d4a4 | 507 | _cleanup_free_ char *resolved = NULL; |
c2ce6a3d | 508 | _cleanup_closedir_ DIR *d = NULL; |
3a6ce860 | 509 | struct stat st; |
d577d4a4 | 510 | int flags; |
cd61c3bf | 511 | |
f461a28d | 512 | r = chase_and_opendir(path, root, CHASE_PREFIX_ROOT, &resolved, &d); |
d577d4a4 LP |
513 | if (r == -ENOENT) |
514 | continue; | |
515 | if (r < 0) | |
516 | return r; | |
cd61c3bf | 517 | |
d577d4a4 LP |
518 | /* As mentioned above, we follow symlinks on this fstatat(), because we want to permit people |
519 | * to symlink block devices into the search path. (For now, we disable that when operating | |
520 | * relative to some root directory.) */ | |
521 | flags = root ? AT_SYMLINK_NOFOLLOW : 0; | |
522 | if (fstatat(dirfd(d), name, &st, flags) < 0) { | |
aceac2f0 | 523 | _cleanup_free_ char *raw = NULL; |
5fc7f358 | 524 | |
3a6ce860 LP |
525 | if (errno != ENOENT) |
526 | return -errno; | |
527 | ||
b910cc72 | 528 | raw = strjoin(name, ".raw"); |
aceac2f0 | 529 | if (!raw) |
5fc7f358 LP |
530 | return -ENOMEM; |
531 | ||
d577d4a4 | 532 | if (fstatat(dirfd(d), raw, &st, flags) < 0) { |
3a6ce860 LP |
533 | if (errno == ENOENT) |
534 | continue; | |
535 | ||
536 | return -errno; | |
537 | } | |
538 | ||
539 | if (!S_ISREG(st.st_mode)) | |
5fc7f358 | 540 | continue; |
3a6ce860 | 541 | |
3775e141 | 542 | r = image_make(class, name, dirfd(d), resolved, raw, &st, ret); |
3a6ce860 LP |
543 | |
544 | } else { | |
545 | if (!S_ISDIR(st.st_mode) && !S_ISBLK(st.st_mode)) | |
546 | continue; | |
547 | ||
3775e141 | 548 | r = image_make(class, name, dirfd(d), resolved, name, &st, ret); |
5fc7f358 | 549 | } |
3a6ce860 LP |
550 | if (IN_SET(r, -ENOENT, -EMEDIUMTYPE)) |
551 | continue; | |
c2ce6a3d LP |
552 | if (r < 0) |
553 | return r; | |
cd61c3bf | 554 | |
cf604fd4 LP |
555 | if (ret) |
556 | (*ret)->discoverable = true; | |
557 | ||
c2ce6a3d LP |
558 | return 1; |
559 | } | |
560 | ||
cf604fd4 | 561 | if (class == IMAGE_MACHINE && streq(name, ".host")) { |
3775e141 | 562 | r = image_make(class, ".host", AT_FDCWD, NULL, empty_to_root(root), NULL, ret); |
cf604fd4 LP |
563 | if (r < 0) |
564 | return r; | |
565 | ||
566 | if (ret) | |
567 | (*ret)->discoverable = true; | |
568 | ||
569 | return r; | |
570 | } | |
5fc7f358 | 571 | |
3a6ce860 | 572 | return -ENOENT; |
c2ce6a3d LP |
573 | }; |
574 | ||
2ddf182b | 575 | int image_from_path(const char *path, Image **ret) { |
cf604fd4 LP |
576 | |
577 | /* Note that we don't set the 'discoverable' field of the returned object, because we don't check here whether | |
578 | * 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 | 579 | * overridden by another, different image earlier in the search path */ |
cf604fd4 | 580 | |
2ddf182b | 581 | if (path_equal(path, "/")) |
3775e141 | 582 | return image_make(IMAGE_MACHINE, ".host", AT_FDCWD, NULL, "/", NULL, ret); |
2ddf182b | 583 | |
3775e141 | 584 | return image_make(_IMAGE_CLASS_INVALID, NULL, AT_FDCWD, NULL, path, NULL, ret); |
2ddf182b LP |
585 | } |
586 | ||
d577d4a4 | 587 | int image_find_harder(ImageClass class, const char *name_or_path, const char *root, Image **ret) { |
2ddf182b | 588 | if (image_name_is_valid(name_or_path)) |
d577d4a4 | 589 | return image_find(class, name_or_path, root, ret); |
2ddf182b LP |
590 | |
591 | return image_from_path(name_or_path, ret); | |
592 | } | |
593 | ||
d577d4a4 LP |
594 | int image_discover( |
595 | ImageClass class, | |
596 | const char *root, | |
597 | Hashmap *h) { | |
598 | ||
c2ce6a3d LP |
599 | int r; |
600 | ||
5ef46e5f LP |
601 | assert(class >= 0); |
602 | assert(class < _IMAGE_CLASS_MAX); | |
c2ce6a3d LP |
603 | assert(h); |
604 | ||
73740c9f | 605 | NULSTR_FOREACH(path, pick_image_search_path(class)) { |
d577d4a4 | 606 | _cleanup_free_ char *resolved = NULL; |
c2ce6a3d | 607 | _cleanup_closedir_ DIR *d = NULL; |
c2ce6a3d | 608 | |
f461a28d | 609 | r = chase_and_opendir(path, root, CHASE_PREFIX_ROOT, &resolved, &d); |
d577d4a4 LP |
610 | if (r == -ENOENT) |
611 | continue; | |
612 | if (r < 0) | |
613 | return r; | |
c2ce6a3d LP |
614 | |
615 | FOREACH_DIRENT_ALL(de, d, return -errno) { | |
616 | _cleanup_(image_unrefp) Image *image = NULL; | |
a747994b | 617 | _cleanup_free_ char *pretty = NULL; |
3a6ce860 | 618 | struct stat st; |
d577d4a4 | 619 | int flags; |
c2ce6a3d | 620 | |
1bf36bf9 | 621 | if (dot_or_dot_dot(de->d_name)) |
c2ce6a3d LP |
622 | continue; |
623 | ||
d577d4a4 LP |
624 | /* As mentioned above, we follow symlinks on this fstatat(), because we want to |
625 | * permit people to symlink block devices into the search path. */ | |
626 | flags = root ? AT_SYMLINK_NOFOLLOW : 0; | |
627 | if (fstatat(dirfd(d), de->d_name, &st, flags) < 0) { | |
3a6ce860 LP |
628 | if (errno == ENOENT) |
629 | continue; | |
630 | ||
631 | return -errno; | |
632 | } | |
633 | ||
a747994b LP |
634 | if (S_ISREG(st.st_mode)) |
635 | r = extract_pretty(de->d_name, image_class_suffix_to_string(class), ".raw", &pretty); | |
636 | else if (S_ISDIR(st.st_mode)) | |
637 | r = extract_pretty(de->d_name, image_class_suffix_to_string(class), NULL, &pretty); | |
638 | else if (S_ISBLK(st.st_mode)) | |
639 | r = extract_pretty(de->d_name, NULL, NULL, &pretty); | |
e7df707b LP |
640 | else { |
641 | log_debug("Skipping directory entry '%s', which is neither regular file, directory nor block device.", de->d_name); | |
3a6ce860 | 642 | continue; |
e7df707b LP |
643 | } |
644 | if (r < 0) { | |
645 | log_debug_errno(r, "Skipping directory entry '%s', which doesn't look like an image.", de->d_name); | |
1bf36bf9 | 646 | continue; |
e7df707b | 647 | } |
1bf36bf9 LP |
648 | |
649 | if (hashmap_contains(h, pretty)) | |
c2ce6a3d LP |
650 | continue; |
651 | ||
3775e141 | 652 | r = image_make(class, pretty, dirfd(d), resolved, de->d_name, &st, &image); |
3a6ce860 | 653 | if (IN_SET(r, -ENOENT, -EMEDIUMTYPE)) |
c2ce6a3d LP |
654 | continue; |
655 | if (r < 0) | |
656 | return r; | |
657 | ||
cf604fd4 LP |
658 | image->discoverable = true; |
659 | ||
c2ce6a3d LP |
660 | r = hashmap_put(h, image->name, image); |
661 | if (r < 0) | |
662 | return r; | |
663 | ||
5df1a553 | 664 | TAKE_PTR(image); |
cd61c3bf LP |
665 | } |
666 | } | |
667 | ||
5ef46e5f | 668 | if (class == IMAGE_MACHINE && !hashmap_contains(h, ".host")) { |
5fc7f358 LP |
669 | _cleanup_(image_unrefp) Image *image = NULL; |
670 | ||
3775e141 | 671 | r = image_make(IMAGE_MACHINE, ".host", AT_FDCWD, NULL, empty_to_root("/"), NULL, &image); |
5fc7f358 LP |
672 | if (r < 0) |
673 | return r; | |
674 | ||
cf604fd4 LP |
675 | image->discoverable = true; |
676 | ||
5fc7f358 LP |
677 | r = hashmap_put(h, image->name, image); |
678 | if (r < 0) | |
679 | return r; | |
680 | ||
681 | image = NULL; | |
5fc7f358 LP |
682 | } |
683 | ||
cd61c3bf LP |
684 | return 0; |
685 | } | |
686 | ||
08682124 | 687 | int image_remove(Image *i) { |
8e766630 | 688 | _cleanup_(release_lock_file) LockFile global_lock = LOCK_FILE_INIT, local_lock = LOCK_FILE_INIT; |
8e0b6570 | 689 | _cleanup_strv_free_ char **settings = NULL; |
bafbac4e | 690 | _cleanup_free_ char *roothash = NULL; |
30535c16 LP |
691 | int r; |
692 | ||
08682124 LP |
693 | assert(i); |
694 | ||
d94c2b06 | 695 | if (IMAGE_IS_VENDOR(i) || IMAGE_IS_HOST(i)) |
08682124 LP |
696 | return -EROFS; |
697 | ||
8e0b6570 LP |
698 | settings = image_settings_path(i); |
699 | if (!settings) | |
700 | return -ENOMEM; | |
701 | ||
162f6477 LP |
702 | r = image_roothash_path(i, &roothash); |
703 | if (r < 0) | |
704 | return r; | |
bafbac4e | 705 | |
30535c16 LP |
706 | /* Make sure we don't interfere with a running nspawn */ |
707 | r = image_path_lock(i->path, LOCK_EX|LOCK_NB, &global_lock, &local_lock); | |
708 | if (r < 0) | |
709 | return r; | |
710 | ||
ebd93cb6 LP |
711 | switch (i->type) { |
712 | ||
713 | case IMAGE_SUBVOLUME: | |
9fb0b9c7 LP |
714 | |
715 | /* Let's unlink first, maybe it is a symlink? If that works we are happy. Otherwise, let's get out the | |
716 | * big guns */ | |
717 | if (unlink(i->path) < 0) { | |
718 | r = btrfs_subvol_remove(i->path, BTRFS_REMOVE_RECURSIVE|BTRFS_REMOVE_QUOTA); | |
719 | if (r < 0) | |
720 | return r; | |
721 | } | |
722 | ||
8e0b6570 | 723 | break; |
ebd93cb6 LP |
724 | |
725 | case IMAGE_DIRECTORY: | |
01b72568 | 726 | /* Allow deletion of read-only directories */ |
db9a4254 | 727 | (void) chattr_path(i->path, 0, FS_IMMUTABLE_FL, NULL); |
8e0b6570 LP |
728 | r = rm_rf(i->path, REMOVE_ROOT|REMOVE_PHYSICAL|REMOVE_SUBVOLUME); |
729 | if (r < 0) | |
730 | return r; | |
731 | ||
732 | break; | |
01b72568 | 733 | |
eb38edce LP |
734 | case IMAGE_BLOCK: |
735 | ||
736 | /* If this is inside of /dev, then it's a real block device, hence let's not touch the device node | |
737 | * itself (but let's remove the stuff stored alongside it). If it's anywhere else, let's try to unlink | |
738 | * the thing (it's most likely a symlink after all). */ | |
739 | ||
740 | if (path_startswith(i->path, "/dev")) | |
741 | break; | |
742 | ||
4831981d | 743 | _fallthrough_; |
aceac2f0 | 744 | case IMAGE_RAW: |
41d1ed05 LP |
745 | if (unlink(i->path) < 0) |
746 | return -errno; | |
8e0b6570 | 747 | break; |
ebd93cb6 LP |
748 | |
749 | default: | |
15411c0c | 750 | return -EOPNOTSUPP; |
ebd93cb6 | 751 | } |
8e0b6570 | 752 | |
de010b0b | 753 | STRV_FOREACH(j, settings) |
8e0b6570 LP |
754 | if (unlink(*j) < 0 && errno != ENOENT) |
755 | log_debug_errno(errno, "Failed to unlink %s, ignoring: %m", *j); | |
8e0b6570 | 756 | |
bafbac4e LP |
757 | if (unlink(roothash) < 0 && errno != ENOENT) |
758 | log_debug_errno(errno, "Failed to unlink %s, ignoring: %m", roothash); | |
759 | ||
8e0b6570 LP |
760 | return 0; |
761 | } | |
762 | ||
bafbac4e | 763 | static int rename_auxiliary_file(const char *path, const char *new_name, const char *suffix) { |
162f6477 LP |
764 | _cleanup_free_ char *fn = NULL, *rs = NULL; |
765 | int r; | |
8e0b6570 | 766 | |
162f6477 LP |
767 | fn = strjoin(new_name, suffix); |
768 | if (!fn) | |
8e0b6570 LP |
769 | return -ENOMEM; |
770 | ||
162f6477 LP |
771 | r = file_in_same_dir(path, fn, &rs); |
772 | if (r < 0) | |
773 | return r; | |
774 | ||
8e0b6570 | 775 | return rename_noreplace(AT_FDCWD, path, AT_FDCWD, rs); |
ebd93cb6 LP |
776 | } |
777 | ||
778 | int image_rename(Image *i, const char *new_name) { | |
8e766630 | 779 | _cleanup_(release_lock_file) LockFile global_lock = LOCK_FILE_INIT, local_lock = LOCK_FILE_INIT, name_lock = LOCK_FILE_INIT; |
bafbac4e | 780 | _cleanup_free_ char *new_path = NULL, *nn = NULL, *roothash = NULL; |
8e0b6570 | 781 | _cleanup_strv_free_ char **settings = NULL; |
01b72568 | 782 | unsigned file_attr = 0; |
ebd93cb6 LP |
783 | int r; |
784 | ||
785 | assert(i); | |
786 | ||
787 | if (!image_name_is_valid(new_name)) | |
788 | return -EINVAL; | |
789 | ||
d94c2b06 | 790 | if (IMAGE_IS_VENDOR(i) || IMAGE_IS_HOST(i)) |
ebd93cb6 LP |
791 | return -EROFS; |
792 | ||
8e0b6570 LP |
793 | settings = image_settings_path(i); |
794 | if (!settings) | |
795 | return -ENOMEM; | |
796 | ||
162f6477 LP |
797 | r = image_roothash_path(i, &roothash); |
798 | if (r < 0) | |
799 | return r; | |
bafbac4e | 800 | |
30535c16 LP |
801 | /* Make sure we don't interfere with a running nspawn */ |
802 | r = image_path_lock(i->path, LOCK_EX|LOCK_NB, &global_lock, &local_lock); | |
803 | if (r < 0) | |
804 | return r; | |
805 | ||
806 | /* Make sure nobody takes the new name, between the time we | |
807 | * checked it is currently unused in all search paths, and the | |
f8e2f4d6 | 808 | * time we take possession of it */ |
30535c16 LP |
809 | r = image_name_lock(new_name, LOCK_EX|LOCK_NB, &name_lock); |
810 | if (r < 0) | |
811 | return r; | |
812 | ||
d577d4a4 | 813 | r = image_find(IMAGE_MACHINE, new_name, NULL, NULL); |
3a6ce860 | 814 | if (r >= 0) |
ebd93cb6 | 815 | return -EEXIST; |
3a6ce860 LP |
816 | if (r != -ENOENT) |
817 | return r; | |
ebd93cb6 LP |
818 | |
819 | switch (i->type) { | |
820 | ||
ebd93cb6 | 821 | case IMAGE_DIRECTORY: |
01b72568 LP |
822 | /* Turn of the immutable bit while we rename the image, so that we can rename it */ |
823 | (void) read_attr_path(i->path, &file_attr); | |
824 | ||
825 | if (file_attr & FS_IMMUTABLE_FL) | |
db9a4254 | 826 | (void) chattr_path(i->path, 0, FS_IMMUTABLE_FL, NULL); |
01b72568 | 827 | |
4831981d | 828 | _fallthrough_; |
01b72568 | 829 | case IMAGE_SUBVOLUME: |
162f6477 | 830 | r = file_in_same_dir(i->path, new_name, &new_path); |
ebd93cb6 LP |
831 | break; |
832 | ||
eb38edce LP |
833 | case IMAGE_BLOCK: |
834 | ||
835 | /* Refuse renaming raw block devices in /dev, the names are picked by udev after all. */ | |
836 | if (path_startswith(i->path, "/dev")) | |
837 | return -EROFS; | |
838 | ||
162f6477 | 839 | r = file_in_same_dir(i->path, new_name, &new_path); |
eb38edce LP |
840 | break; |
841 | ||
aceac2f0 | 842 | case IMAGE_RAW: { |
ebd93cb6 LP |
843 | const char *fn; |
844 | ||
63c372cb | 845 | fn = strjoina(new_name, ".raw"); |
162f6477 LP |
846 | |
847 | r = file_in_same_dir(i->path, fn, &new_path); | |
ebd93cb6 LP |
848 | break; |
849 | } | |
850 | ||
851 | default: | |
15411c0c | 852 | return -EOPNOTSUPP; |
ebd93cb6 | 853 | } |
162f6477 LP |
854 | if (r < 0) |
855 | return r; | |
ebd93cb6 LP |
856 | |
857 | nn = strdup(new_name); | |
858 | if (!nn) | |
859 | return -ENOMEM; | |
860 | ||
f85ef957 AC |
861 | r = rename_noreplace(AT_FDCWD, i->path, AT_FDCWD, new_path); |
862 | if (r < 0) | |
863 | return r; | |
ebd93cb6 | 864 | |
01b72568 LP |
865 | /* Restore the immutable bit, if it was set before */ |
866 | if (file_attr & FS_IMMUTABLE_FL) | |
db9a4254 | 867 | (void) chattr_path(new_path, FS_IMMUTABLE_FL, FS_IMMUTABLE_FL, NULL); |
01b72568 | 868 | |
f9ecfd3b DL |
869 | free_and_replace(i->path, new_path); |
870 | free_and_replace(i->name, nn); | |
ebd93cb6 | 871 | |
8e0b6570 | 872 | STRV_FOREACH(j, settings) { |
bafbac4e | 873 | r = rename_auxiliary_file(*j, new_name, ".nspawn"); |
8e0b6570 LP |
874 | if (r < 0 && r != -ENOENT) |
875 | log_debug_errno(r, "Failed to rename settings file %s, ignoring: %m", *j); | |
876 | } | |
877 | ||
bafbac4e LP |
878 | r = rename_auxiliary_file(roothash, new_name, ".roothash"); |
879 | if (r < 0 && r != -ENOENT) | |
880 | log_debug_errno(r, "Failed to rename roothash file %s, ignoring: %m", roothash); | |
881 | ||
ebd93cb6 LP |
882 | return 0; |
883 | } | |
884 | ||
bafbac4e | 885 | static int clone_auxiliary_file(const char *path, const char *new_name, const char *suffix) { |
162f6477 LP |
886 | _cleanup_free_ char *fn = NULL, *rs = NULL; |
887 | int r; | |
8e0b6570 | 888 | |
162f6477 LP |
889 | fn = strjoin(new_name, suffix); |
890 | if (!fn) | |
8e0b6570 LP |
891 | return -ENOMEM; |
892 | ||
162f6477 LP |
893 | r = file_in_same_dir(path, fn, &rs); |
894 | if (r < 0) | |
895 | return r; | |
896 | ||
7c2f5495 | 897 | return copy_file_atomic(path, rs, 0664, COPY_REFLINK); |
8e0b6570 LP |
898 | } |
899 | ||
ebd93cb6 | 900 | int image_clone(Image *i, const char *new_name, bool read_only) { |
8e766630 | 901 | _cleanup_(release_lock_file) LockFile name_lock = LOCK_FILE_INIT; |
8e0b6570 | 902 | _cleanup_strv_free_ char **settings = NULL; |
bafbac4e | 903 | _cleanup_free_ char *roothash = NULL; |
ebd93cb6 LP |
904 | const char *new_path; |
905 | int r; | |
906 | ||
907 | assert(i); | |
908 | ||
909 | if (!image_name_is_valid(new_name)) | |
910 | return -EINVAL; | |
911 | ||
8e0b6570 LP |
912 | settings = image_settings_path(i); |
913 | if (!settings) | |
914 | return -ENOMEM; | |
915 | ||
162f6477 LP |
916 | r = image_roothash_path(i, &roothash); |
917 | if (r < 0) | |
918 | return r; | |
bafbac4e | 919 | |
30535c16 LP |
920 | /* Make sure nobody takes the new name, between the time we |
921 | * checked it is currently unused in all search paths, and the | |
f8e2f4d6 | 922 | * time we take possession of it */ |
30535c16 LP |
923 | r = image_name_lock(new_name, LOCK_EX|LOCK_NB, &name_lock); |
924 | if (r < 0) | |
925 | return r; | |
926 | ||
d577d4a4 | 927 | r = image_find(IMAGE_MACHINE, new_name, NULL, NULL); |
3a6ce860 | 928 | if (r >= 0) |
ebd93cb6 | 929 | return -EEXIST; |
3a6ce860 LP |
930 | if (r != -ENOENT) |
931 | return r; | |
ebd93cb6 LP |
932 | |
933 | switch (i->type) { | |
934 | ||
935 | case IMAGE_SUBVOLUME: | |
936 | case IMAGE_DIRECTORY: | |
9a50e3ca | 937 | /* If we can we'll always try to create a new btrfs subvolume here, even if the source is a plain |
13e785f7 | 938 | * directory. */ |
9a50e3ca | 939 | |
63c372cb | 940 | new_path = strjoina("/var/lib/machines/", new_name); |
ebd93cb6 | 941 | |
fab4ef72 DDM |
942 | r = btrfs_subvol_snapshot_at(AT_FDCWD, i->path, AT_FDCWD, new_path, |
943 | (read_only ? BTRFS_SNAPSHOT_READ_ONLY : 0) | | |
944 | BTRFS_SNAPSHOT_FALLBACK_COPY | | |
945 | BTRFS_SNAPSHOT_FALLBACK_DIRECTORY | | |
946 | BTRFS_SNAPSHOT_FALLBACK_IMMUTABLE | | |
947 | BTRFS_SNAPSHOT_RECURSIVE | | |
948 | BTRFS_SNAPSHOT_QUOTA); | |
17cbb288 | 949 | if (r >= 0) |
9a50e3ca | 950 | /* Enable "subtree" quotas for the copy, if we didn't copy any quota from the source. */ |
8120ee28 | 951 | (void) btrfs_subvol_auto_qgroup(new_path, 0, true); |
5bcd08db | 952 | |
ebd93cb6 LP |
953 | break; |
954 | ||
aceac2f0 | 955 | case IMAGE_RAW: |
63c372cb | 956 | new_path = strjoina("/var/lib/machines/", new_name, ".raw"); |
ebd93cb6 | 957 | |
7c2f5495 DDM |
958 | r = copy_file_atomic_full(i->path, new_path, read_only ? 0444 : 0644, FS_NOCOW_FL, FS_NOCOW_FL, |
959 | COPY_REFLINK|COPY_CRTIME, NULL, NULL); | |
ebd93cb6 LP |
960 | break; |
961 | ||
eb38edce | 962 | case IMAGE_BLOCK: |
ebd93cb6 | 963 | default: |
15411c0c | 964 | return -EOPNOTSUPP; |
ebd93cb6 LP |
965 | } |
966 | ||
967 | if (r < 0) | |
968 | return r; | |
969 | ||
8e0b6570 | 970 | STRV_FOREACH(j, settings) { |
bafbac4e | 971 | r = clone_auxiliary_file(*j, new_name, ".nspawn"); |
8e0b6570 LP |
972 | if (r < 0 && r != -ENOENT) |
973 | log_debug_errno(r, "Failed to clone settings %s, ignoring: %m", *j); | |
974 | } | |
975 | ||
bafbac4e LP |
976 | r = clone_auxiliary_file(roothash, new_name, ".roothash"); |
977 | if (r < 0 && r != -ENOENT) | |
978 | log_debug_errno(r, "Failed to clone root hash file %s, ignoring: %m", roothash); | |
979 | ||
ebd93cb6 LP |
980 | return 0; |
981 | } | |
982 | ||
983 | int image_read_only(Image *i, bool b) { | |
8e766630 | 984 | _cleanup_(release_lock_file) LockFile global_lock = LOCK_FILE_INIT, local_lock = LOCK_FILE_INIT; |
ebd93cb6 | 985 | int r; |
c7664c07 | 986 | |
ebd93cb6 LP |
987 | assert(i); |
988 | ||
d94c2b06 | 989 | if (IMAGE_IS_VENDOR(i) || IMAGE_IS_HOST(i)) |
ebd93cb6 LP |
990 | return -EROFS; |
991 | ||
30535c16 LP |
992 | /* Make sure we don't interfere with a running nspawn */ |
993 | r = image_path_lock(i->path, LOCK_EX|LOCK_NB, &global_lock, &local_lock); | |
994 | if (r < 0) | |
995 | return r; | |
996 | ||
ebd93cb6 LP |
997 | switch (i->type) { |
998 | ||
999 | case IMAGE_SUBVOLUME: | |
5bcd08db LP |
1000 | |
1001 | /* Note that we set the flag only on the top-level | |
1002 | * subvolume of the image. */ | |
1003 | ||
ebd93cb6 LP |
1004 | r = btrfs_subvol_set_read_only(i->path, b); |
1005 | if (r < 0) | |
1006 | return r; | |
01b72568 LP |
1007 | |
1008 | break; | |
1009 | ||
1010 | case IMAGE_DIRECTORY: | |
1011 | /* For simple directory trees we cannot use the access | |
1012 | mode of the top-level directory, since it has an | |
1013 | effect on the container itself. However, we can | |
1014 | use the "immutable" flag, to at least make the | |
1015 | top-level directory read-only. It's not as good as | |
1016 | a read-only subvolume, but at least something, and | |
13e785f7 | 1017 | we can read the value back. */ |
01b72568 | 1018 | |
db9a4254 | 1019 | r = chattr_path(i->path, b ? FS_IMMUTABLE_FL : 0, FS_IMMUTABLE_FL, NULL); |
01b72568 LP |
1020 | if (r < 0) |
1021 | return r; | |
1022 | ||
ebd93cb6 LP |
1023 | break; |
1024 | ||
aceac2f0 | 1025 | case IMAGE_RAW: { |
ebd93cb6 LP |
1026 | struct stat st; |
1027 | ||
1028 | if (stat(i->path, &st) < 0) | |
1029 | return -errno; | |
1030 | ||
1031 | if (chmod(i->path, (st.st_mode & 0444) | (b ? 0000 : 0200)) < 0) | |
1032 | return -errno; | |
f2068bcc LP |
1033 | |
1034 | /* If the images is now read-only, it's a good time to | |
1035 | * defrag it, given that no write patterns will | |
1036 | * fragment it again. */ | |
1037 | if (b) | |
1038 | (void) btrfs_defrag(i->path); | |
ebd93cb6 LP |
1039 | break; |
1040 | } | |
1041 | ||
eb38edce | 1042 | case IMAGE_BLOCK: { |
254d1313 | 1043 | _cleanup_close_ int fd = -EBADF; |
eb38edce LP |
1044 | struct stat st; |
1045 | int state = b; | |
1046 | ||
1047 | fd = open(i->path, O_CLOEXEC|O_RDONLY|O_NONBLOCK|O_NOCTTY); | |
1048 | if (fd < 0) | |
1049 | return -errno; | |
1050 | ||
1051 | if (fstat(fd, &st) < 0) | |
1052 | return -errno; | |
1053 | if (!S_ISBLK(st.st_mode)) | |
1054 | return -ENOTTY; | |
1055 | ||
1056 | if (ioctl(fd, BLKROSET, &state) < 0) | |
1057 | return -errno; | |
1058 | ||
1059 | break; | |
1060 | } | |
1061 | ||
ebd93cb6 | 1062 | default: |
15411c0c | 1063 | return -EOPNOTSUPP; |
ebd93cb6 LP |
1064 | } |
1065 | ||
1066 | return 0; | |
08682124 LP |
1067 | } |
1068 | ||
30535c16 LP |
1069 | int image_path_lock(const char *path, int operation, LockFile *global, LockFile *local) { |
1070 | _cleanup_free_ char *p = NULL; | |
1071 | LockFile t = LOCK_FILE_INIT; | |
1072 | struct stat st; | |
f25bed67 | 1073 | bool exclusive; |
30535c16 LP |
1074 | int r; |
1075 | ||
1076 | assert(path); | |
1077 | assert(global); | |
1078 | assert(local); | |
1079 | ||
f25bed67 LP |
1080 | /* Locks an image path. This actually creates two locks: one "local" one, next to the image path |
1081 | * itself, which might be shared via NFS. And another "global" one, in /run, that uses the | |
1082 | * device/inode number. This has the benefit that we can even lock a tree that is a mount point, | |
1083 | * correctly. */ | |
30535c16 | 1084 | |
30535c16 LP |
1085 | if (!path_is_absolute(path)) |
1086 | return -EINVAL; | |
1087 | ||
f25bed67 LP |
1088 | switch (operation & (LOCK_SH|LOCK_EX)) { |
1089 | case LOCK_SH: | |
1090 | exclusive = false; | |
1091 | break; | |
1092 | case LOCK_EX: | |
1093 | exclusive = true; | |
1094 | break; | |
1095 | default: | |
1096 | return -EINVAL; | |
1097 | } | |
1098 | ||
b6e953f2 LP |
1099 | if (getenv_bool("SYSTEMD_NSPAWN_LOCK") == 0) { |
1100 | *local = *global = (LockFile) LOCK_FILE_INIT; | |
1101 | return 0; | |
1102 | } | |
1103 | ||
f25bed67 LP |
1104 | /* Prohibit taking exclusive locks on the host image. We can't allow this, since we ourselves are |
1105 | * running off it after all, and we don't want any images to manipulate the host image. We make an | |
1106 | * exception for shared locks however: we allow those (and make them NOPs since there's no point in | |
1107 | * taking them if there can't be exclusive locks). Strictly speaking these are questionable as well, | |
1108 | * since it means changes made to the host might propagate to the container as they happen (and a | |
1109 | * shared lock kinda suggests that no changes happen at all while it is in place), but it's too | |
1110 | * useful not to allow read-only containers off the host root, hence let's support this, and trust | |
1111 | * the user to do the right thing with this. */ | |
1112 | if (path_equal(path, "/")) { | |
1113 | if (exclusive) | |
1114 | return -EBUSY; | |
1115 | ||
1116 | *local = *global = (LockFile) LOCK_FILE_INIT; | |
1117 | return 0; | |
1118 | } | |
b6e953f2 | 1119 | |
30535c16 | 1120 | if (stat(path, &st) >= 0) { |
eb38edce LP |
1121 | if (S_ISBLK(st.st_mode)) |
1122 | r = asprintf(&p, "/run/systemd/nspawn/locks/block-%u:%u", major(st.st_rdev), minor(st.st_rdev)); | |
1123 | else if (S_ISDIR(st.st_mode) || S_ISREG(st.st_mode)) | |
1124 | r = asprintf(&p, "/run/systemd/nspawn/locks/inode-%lu:%lu", (unsigned long) st.st_dev, (unsigned long) st.st_ino); | |
1125 | else | |
1126 | return -ENOTTY; | |
eb38edce | 1127 | if (r < 0) |
30535c16 LP |
1128 | return -ENOMEM; |
1129 | } | |
1130 | ||
f25bed67 LP |
1131 | /* For block devices we don't need the "local" lock, as the major/minor lock above should be |
1132 | * sufficient, since block devices are host local anyway. */ | |
1133 | if (!path_startswith(path, "/dev/")) { | |
eb38edce | 1134 | r = make_lock_file_for(path, operation, &t); |
8be17c9b | 1135 | if (r < 0) { |
f25bed67 | 1136 | if (!exclusive && r == -EROFS) |
771b7ead | 1137 | log_debug_errno(r, "Failed to create shared lock for '%s', ignoring: %m", path); |
8be17c9b LT |
1138 | else |
1139 | return r; | |
1140 | } | |
eb38edce | 1141 | } |
30535c16 LP |
1142 | |
1143 | if (p) { | |
6e5dcce4 | 1144 | (void) mkdir_p("/run/systemd/nspawn/locks", 0700); |
30535c16 LP |
1145 | |
1146 | r = make_lock_file(p, operation, global); | |
1147 | if (r < 0) { | |
1148 | release_lock_file(&t); | |
1149 | return r; | |
1150 | } | |
546dbec5 LP |
1151 | } else |
1152 | *global = (LockFile) LOCK_FILE_INIT; | |
30535c16 LP |
1153 | |
1154 | *local = t; | |
1155 | return 0; | |
1156 | } | |
1157 | ||
cb81cd80 | 1158 | int image_set_limit(Image *i, uint64_t referenced_max) { |
d6ce17c7 LP |
1159 | assert(i); |
1160 | ||
d94c2b06 | 1161 | if (IMAGE_IS_VENDOR(i) || IMAGE_IS_HOST(i)) |
d6ce17c7 LP |
1162 | return -EROFS; |
1163 | ||
1164 | if (i->type != IMAGE_SUBVOLUME) | |
15411c0c | 1165 | return -EOPNOTSUPP; |
d6ce17c7 | 1166 | |
5bcd08db LP |
1167 | /* We set the quota both for the subvolume as well as for the |
1168 | * subtree. The latter is mostly for historical reasons, since | |
1169 | * we didn't use to have a concept of subtree quota, and hence | |
1170 | * only modified the subvolume quota. */ | |
1171 | ||
1172 | (void) btrfs_qgroup_set_limit(i->path, 0, referenced_max); | |
1173 | (void) btrfs_subvol_auto_qgroup(i->path, 0, true); | |
1174 | return btrfs_subvol_set_subtree_quota_limit(i->path, 0, referenced_max); | |
d6ce17c7 LP |
1175 | } |
1176 | ||
84be0c71 | 1177 | int image_read_metadata(Image *i, const ImagePolicy *image_policy) { |
8e766630 | 1178 | _cleanup_(release_lock_file) LockFile global_lock = LOCK_FILE_INIT, local_lock = LOCK_FILE_INIT; |
c7664c07 LP |
1179 | int r; |
1180 | ||
1181 | assert(i); | |
1182 | ||
1183 | r = image_path_lock(i->path, LOCK_SH|LOCK_NB, &global_lock, &local_lock); | |
1184 | if (r < 0) | |
1185 | return r; | |
1186 | ||
1187 | switch (i->type) { | |
1188 | ||
1189 | case IMAGE_SUBVOLUME: | |
1190 | case IMAGE_DIRECTORY: { | |
a81fe93e LP |
1191 | _cleanup_strv_free_ char **machine_info = NULL, **os_release = NULL, **sysext_release = NULL, **confext_release = NULL; |
1192 | _cleanup_free_ char *hostname = NULL, *path = NULL; | |
c7664c07 | 1193 | sd_id128_t machine_id = SD_ID128_NULL; |
c7664c07 | 1194 | |
b60e0f57 | 1195 | if (i->class == IMAGE_SYSEXT) { |
6afa5d86 LB |
1196 | r = extension_has_forbidden_content(i->path); |
1197 | if (r < 0) | |
1198 | return r; | |
1199 | if (r > 0) | |
1200 | return log_debug_errno(SYNTHETIC_ERRNO(ENOMEDIUM), | |
1201 | "Conflicting content found in image %s, refusing.", | |
1202 | i->name); | |
1203 | } | |
1204 | ||
f461a28d | 1205 | r = chase("/etc/hostname", i->path, CHASE_PREFIX_ROOT|CHASE_TRAIL_SLASH, &path, NULL); |
c7664c07 LP |
1206 | if (r < 0 && r != -ENOENT) |
1207 | log_debug_errno(r, "Failed to chase /etc/hostname in image %s: %m", i->name); | |
1208 | else if (r >= 0) { | |
1209 | r = read_etc_hostname(path, &hostname); | |
1210 | if (r < 0) | |
1211 | log_debug_errno(errno, "Failed to read /etc/hostname of image %s: %m", i->name); | |
1212 | } | |
1213 | ||
1214 | path = mfree(path); | |
1215 | ||
f7b5f399 YW |
1216 | r = id128_get_machine(i->path, &machine_id); |
1217 | if (r < 0) | |
1218 | log_debug_errno(r, "Failed to read machine ID in image %s, ignoring: %m", i->name); | |
c7664c07 | 1219 | |
f461a28d | 1220 | r = chase("/etc/machine-info", i->path, CHASE_PREFIX_ROOT|CHASE_TRAIL_SLASH, &path, NULL); |
c7664c07 LP |
1221 | if (r < 0 && r != -ENOENT) |
1222 | log_debug_errno(r, "Failed to chase /etc/machine-info in image %s: %m", i->name); | |
1223 | else if (r >= 0) { | |
aa8fbc74 | 1224 | r = load_env_file_pairs(NULL, path, &machine_info); |
c7664c07 LP |
1225 | if (r < 0) |
1226 | log_debug_errno(r, "Failed to parse machine-info data of %s: %m", i->name); | |
1227 | } | |
1228 | ||
d58ad743 LP |
1229 | r = load_os_release_pairs(i->path, &os_release); |
1230 | if (r < 0) | |
1231 | log_debug_errno(r, "Failed to read os-release in image, ignoring: %m"); | |
c7664c07 | 1232 | |
a81fe93e | 1233 | r = load_extension_release_pairs(i->path, IMAGE_SYSEXT, i->name, /* relax_extension_release_check= */ false, &sysext_release); |
bcf94222 | 1234 | if (r < 0) |
a81fe93e LP |
1235 | log_debug_errno(r, "Failed to read sysext-release in image, ignoring: %m"); |
1236 | ||
1237 | r = load_extension_release_pairs(i->path, IMAGE_CONFEXT, i->name, /* relax_extension_release_check= */ false, &confext_release); | |
1238 | if (r < 0) | |
1239 | log_debug_errno(r, "Failed to read confext-release in image, ignoring: %m"); | |
bcf94222 | 1240 | |
c7664c07 LP |
1241 | free_and_replace(i->hostname, hostname); |
1242 | i->machine_id = machine_id; | |
1243 | strv_free_and_replace(i->machine_info, machine_info); | |
1244 | strv_free_and_replace(i->os_release, os_release); | |
a81fe93e LP |
1245 | strv_free_and_replace(i->sysext_release, sysext_release); |
1246 | strv_free_and_replace(i->confext_release, confext_release); | |
c7664c07 LP |
1247 | break; |
1248 | } | |
1249 | ||
1250 | case IMAGE_RAW: | |
1251 | case IMAGE_BLOCK: { | |
1252 | _cleanup_(loop_device_unrefp) LoopDevice *d = NULL; | |
1253 | _cleanup_(dissected_image_unrefp) DissectedImage *m = NULL; | |
1254 | ||
22ee78a8 | 1255 | r = loop_device_make_by_path(i->path, O_RDONLY, /* sector_size= */ UINT32_MAX, LO_FLAGS_PARTSCAN, LOCK_SH, &d); |
41bc4849 LP |
1256 | if (r < 0) |
1257 | return r; | |
1258 | ||
bad31660 YW |
1259 | r = dissect_loop_device( |
1260 | d, | |
84be0c71 LP |
1261 | /* verity= */ NULL, |
1262 | /* mount_options= */ NULL, | |
1263 | image_policy, | |
4b5de5dd LP |
1264 | DISSECT_IMAGE_GENERIC_ROOT | |
1265 | DISSECT_IMAGE_REQUIRE_ROOT | | |
1266 | DISSECT_IMAGE_RELAX_VAR_CHECK | | |
f6f4ec79 | 1267 | DISSECT_IMAGE_READ_ONLY | |
73d88b80 LP |
1268 | DISSECT_IMAGE_USR_NO_ROOT | |
1269 | DISSECT_IMAGE_ADD_PARTITION_DEVICES | | |
1270 | DISSECT_IMAGE_PIN_PARTITION_DEVICES, | |
75dc190d | 1271 | &m); |
c7664c07 LP |
1272 | if (r < 0) |
1273 | return r; | |
1274 | ||
22847508 ZJS |
1275 | r = dissected_image_acquire_metadata(m, |
1276 | DISSECT_IMAGE_VALIDATE_OS | | |
1277 | DISSECT_IMAGE_VALIDATE_OS_EXT); | |
c7664c07 LP |
1278 | if (r < 0) |
1279 | return r; | |
1280 | ||
1281 | free_and_replace(i->hostname, m->hostname); | |
1282 | i->machine_id = m->machine_id; | |
1283 | strv_free_and_replace(i->machine_info, m->machine_info); | |
1284 | strv_free_and_replace(i->os_release, m->os_release); | |
a81fe93e LP |
1285 | strv_free_and_replace(i->sysext_release, m->sysext_release); |
1286 | strv_free_and_replace(i->confext_release, m->confext_release); | |
c7664c07 LP |
1287 | |
1288 | break; | |
1289 | } | |
1290 | ||
1291 | default: | |
1292 | return -EOPNOTSUPP; | |
1293 | } | |
1294 | ||
1295 | i->metadata_valid = true; | |
1296 | ||
1297 | return 0; | |
1298 | } | |
1299 | ||
30535c16 | 1300 | int image_name_lock(const char *name, int operation, LockFile *ret) { |
99d97afc LP |
1301 | const char *p; |
1302 | ||
30535c16 LP |
1303 | assert(name); |
1304 | assert(ret); | |
1305 | ||
1306 | /* Locks an image name, regardless of the precise path used. */ | |
1307 | ||
99d97afc LP |
1308 | if (streq(name, ".host")) |
1309 | return -EBUSY; | |
1310 | ||
30535c16 LP |
1311 | if (!image_name_is_valid(name)) |
1312 | return -EINVAL; | |
1313 | ||
b6e953f2 LP |
1314 | if (getenv_bool("SYSTEMD_NSPAWN_LOCK") == 0) { |
1315 | *ret = (LockFile) LOCK_FILE_INIT; | |
1316 | return 0; | |
1317 | } | |
1318 | ||
6e5dcce4 | 1319 | (void) mkdir_p("/run/systemd/nspawn/locks", 0700); |
99d97afc LP |
1320 | |
1321 | p = strjoina("/run/systemd/nspawn/locks/name-", name); | |
30535c16 LP |
1322 | return make_lock_file(p, operation, ret); |
1323 | } | |
1324 | ||
d577d4a4 LP |
1325 | bool image_in_search_path( |
1326 | ImageClass class, | |
1327 | const char *root, | |
1328 | const char *image) { | |
1329 | ||
ace9ab19 LP |
1330 | assert(image); |
1331 | ||
73740c9f | 1332 | NULSTR_FOREACH(path, pick_image_search_path(class)) { |
d577d4a4 | 1333 | const char *p, *q; |
ace9ab19 LP |
1334 | size_t k; |
1335 | ||
d577d4a4 LP |
1336 | if (!empty_or_root(root)) { |
1337 | q = path_startswith(path, root); | |
1338 | if (!q) | |
1339 | continue; | |
1340 | } else | |
1341 | q = path; | |
1342 | ||
1343 | p = path_startswith(q, path); | |
ace9ab19 LP |
1344 | if (!p) |
1345 | continue; | |
1346 | ||
1347 | /* Make sure there's a filename following */ | |
1348 | k = strcspn(p, "/"); | |
1349 | if (k == 0) | |
1350 | continue; | |
1351 | ||
1352 | p += k; | |
1353 | ||
1354 | /* Accept trailing slashes */ | |
1355 | if (p[strspn(p, "/")] == 0) | |
1356 | return true; | |
1357 | ||
1358 | } | |
1359 | ||
1360 | return false; | |
1361 | } | |
1362 | ||
f5151fb4 LP |
1363 | int image_to_json(const struct Image *img, JsonVariant **ret) { |
1364 | assert(img); | |
1365 | ||
1366 | return json_build(ret, | |
1367 | JSON_BUILD_OBJECT( | |
1368 | JSON_BUILD_PAIR_STRING("Type", image_type_to_string(img->type)), | |
1369 | JSON_BUILD_PAIR_STRING("Class", image_class_to_string(img->class)), | |
1370 | JSON_BUILD_PAIR_STRING("Name", img->name), | |
1371 | JSON_BUILD_PAIR_CONDITION(img->path, "Path", JSON_BUILD_STRING(img->path)), | |
1372 | JSON_BUILD_PAIR_BOOLEAN("ReadOnly", img->read_only), | |
1373 | JSON_BUILD_PAIR_CONDITION(img->crtime != 0, "CreationTimestamp", JSON_BUILD_UNSIGNED(img->crtime)), | |
1374 | JSON_BUILD_PAIR_CONDITION(img->mtime != 0, "ModificationTimestamp", JSON_BUILD_UNSIGNED(img->mtime)), | |
1375 | JSON_BUILD_PAIR_CONDITION(img->usage != UINT64_MAX, "Usage", JSON_BUILD_UNSIGNED(img->usage)), | |
1376 | JSON_BUILD_PAIR_CONDITION(img->usage_exclusive != UINT64_MAX, "UsageExclusive", JSON_BUILD_UNSIGNED(img->usage_exclusive)), | |
1377 | JSON_BUILD_PAIR_CONDITION(img->limit != UINT64_MAX, "Limit", JSON_BUILD_UNSIGNED(img->limit)), | |
1378 | JSON_BUILD_PAIR_CONDITION(img->limit_exclusive != UINT64_MAX, "LimitExclusive", JSON_BUILD_UNSIGNED(img->limit_exclusive)))); | |
1379 | } | |
1380 | ||
cd61c3bf LP |
1381 | static const char* const image_type_table[_IMAGE_TYPE_MAX] = { |
1382 | [IMAGE_DIRECTORY] = "directory", | |
1383 | [IMAGE_SUBVOLUME] = "subvolume", | |
25cdbd04 LP |
1384 | [IMAGE_RAW] = "raw", |
1385 | [IMAGE_BLOCK] = "block", | |
cd61c3bf LP |
1386 | }; |
1387 | ||
1388 | DEFINE_STRING_TABLE_LOOKUP(image_type, ImageType); |