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Commit | Line | Data |
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cd61c3bf LP |
1 | /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/ |
2 | ||
3 | /*** | |
4 | This file is part of systemd. | |
5 | ||
6 | Copyright 2013 Lennart Poettering | |
7 | ||
8 | systemd is free software; you can redistribute it and/or modify it | |
9 | under the terms of the GNU Lesser General Public License as published by | |
10 | the Free Software Foundation; either version 2.1 of the License, or | |
11 | (at your option) any later version. | |
12 | ||
13 | systemd is distributed in the hope that it will be useful, but | |
14 | WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
16 | Lesser General Public License for more details. | |
17 | ||
18 | You should have received a copy of the GNU Lesser General Public License | |
19 | along with systemd; If not, see <http://www.gnu.org/licenses/>. | |
20 | ***/ | |
21 | ||
ebd93cb6 | 22 | #include <fcntl.h> |
8e0b6570 LP |
23 | #include <linux/fs.h> |
24 | #include <sys/statfs.h> | |
cd61c3bf | 25 | |
cd61c3bf | 26 | #include "btrfs-util.h" |
ebd93cb6 | 27 | #include "copy.h" |
30535c16 | 28 | #include "mkdir.h" |
8e0b6570 | 29 | #include "path-util.h" |
c6878637 | 30 | #include "rm-rf.h" |
07630cea | 31 | #include "string-util.h" |
8e0b6570 LP |
32 | #include "strv.h" |
33 | #include "utf8.h" | |
003dffde | 34 | #include "machine-image.h" |
cd61c3bf | 35 | |
c2ce6a3d | 36 | static const char image_search_path[] = |
42c6f2c9 | 37 | "/var/lib/machines\0" |
7d105503 | 38 | "/var/lib/container\0" /* legacy */ |
42c6f2c9 LP |
39 | "/usr/local/lib/machines\0" |
40 | "/usr/lib/machines\0"; | |
c2ce6a3d | 41 | |
cd61c3bf LP |
42 | Image *image_unref(Image *i) { |
43 | if (!i) | |
44 | return NULL; | |
45 | ||
46 | free(i->name); | |
47 | free(i->path); | |
48 | free(i); | |
49 | return NULL; | |
50 | } | |
51 | ||
8e0b6570 LP |
52 | static char **image_settings_path(Image *image) { |
53 | _cleanup_strv_free_ char **l = NULL; | |
54 | char **ret; | |
55 | const char *fn, *s; | |
56 | unsigned i = 0; | |
57 | ||
58 | assert(image); | |
59 | ||
60 | l = new0(char*, 4); | |
61 | if (!l) | |
62 | return NULL; | |
63 | ||
64 | fn = strjoina(image->name, ".nspawn"); | |
65 | ||
66 | FOREACH_STRING(s, "/etc/systemd/nspawn/", "/run/systemd/nspawn/") { | |
67 | l[i] = strappend(s, fn); | |
68 | if (!l[i]) | |
69 | return NULL; | |
70 | ||
71 | i++; | |
72 | } | |
73 | ||
74 | l[i] = file_in_same_dir(image->path, fn); | |
75 | if (!l[i]) | |
76 | return NULL; | |
77 | ||
78 | ret = l; | |
79 | l = NULL; | |
80 | ||
81 | return ret; | |
82 | } | |
83 | ||
c2ce6a3d | 84 | static int image_new( |
cd61c3bf | 85 | ImageType t, |
5fc7f358 | 86 | const char *pretty, |
cd61c3bf | 87 | const char *path, |
5fc7f358 | 88 | const char *filename, |
cd61c3bf | 89 | bool read_only, |
10f9c755 | 90 | usec_t crtime, |
cd61c3bf | 91 | usec_t mtime, |
c2ce6a3d | 92 | Image **ret) { |
cd61c3bf LP |
93 | |
94 | _cleanup_(image_unrefp) Image *i = NULL; | |
cd61c3bf | 95 | |
cd61c3bf LP |
96 | assert(t >= 0); |
97 | assert(t < _IMAGE_TYPE_MAX); | |
5fc7f358 LP |
98 | assert(pretty); |
99 | assert(filename); | |
c2ce6a3d | 100 | assert(ret); |
cd61c3bf | 101 | |
c2ce6a3d | 102 | i = new0(Image, 1); |
cd61c3bf LP |
103 | if (!i) |
104 | return -ENOMEM; | |
105 | ||
106 | i->type = t; | |
107 | i->read_only = read_only; | |
10f9c755 | 108 | i->crtime = crtime; |
cd61c3bf | 109 | i->mtime = mtime; |
c19de711 | 110 | i->usage = i->usage_exclusive = (uint64_t) -1; |
b6b18498 | 111 | i->limit = i->limit_exclusive = (uint64_t) -1; |
cd61c3bf | 112 | |
5fc7f358 | 113 | i->name = strdup(pretty); |
cd61c3bf LP |
114 | if (!i->name) |
115 | return -ENOMEM; | |
116 | ||
5fc7f358 LP |
117 | if (path) |
118 | i->path = strjoin(path, "/", filename, NULL); | |
119 | else | |
120 | i->path = strdup(filename); | |
ebeccf9e | 121 | |
5fc7f358 LP |
122 | if (!i->path) |
123 | return -ENOMEM; | |
124 | ||
125 | path_kill_slashes(i->path); | |
cd61c3bf | 126 | |
c2ce6a3d | 127 | *ret = i; |
cd61c3bf | 128 | i = NULL; |
c2ce6a3d | 129 | |
cd61c3bf LP |
130 | return 0; |
131 | } | |
132 | ||
5fc7f358 LP |
133 | static int image_make( |
134 | const char *pretty, | |
135 | int dfd, | |
136 | const char *path, | |
137 | const char *filename, | |
138 | Image **ret) { | |
139 | ||
c2ce6a3d | 140 | struct stat st; |
5fc7f358 | 141 | bool read_only; |
cd61c3bf LP |
142 | int r; |
143 | ||
5fc7f358 | 144 | assert(filename); |
cd61c3bf | 145 | |
c2ce6a3d | 146 | /* We explicitly *do* follow symlinks here, since we want to |
5f129649 | 147 | * allow symlinking trees into /var/lib/machines/, and treat |
c2ce6a3d | 148 | * them normally. */ |
cd61c3bf | 149 | |
5fc7f358 | 150 | if (fstatat(dfd, filename, &st, 0) < 0) |
c2ce6a3d | 151 | return -errno; |
cd61c3bf | 152 | |
5fc7f358 LP |
153 | read_only = |
154 | (path && path_startswith(path, "/usr")) || | |
08ff5529 | 155 | (faccessat(dfd, filename, W_OK, AT_EACCESS) < 0 && errno == EROFS); |
86e339c8 | 156 | |
c2ce6a3d | 157 | if (S_ISDIR(st.st_mode)) { |
01b72568 LP |
158 | _cleanup_close_ int fd = -1; |
159 | unsigned file_attr = 0; | |
cd61c3bf | 160 | |
c2ce6a3d LP |
161 | if (!ret) |
162 | return 1; | |
cd61c3bf | 163 | |
5fc7f358 LP |
164 | if (!pretty) |
165 | pretty = filename; | |
166 | ||
01b72568 LP |
167 | fd = openat(dfd, filename, O_CLOEXEC|O_NOCTTY|O_DIRECTORY); |
168 | if (fd < 0) | |
169 | return -errno; | |
170 | ||
c2ce6a3d LP |
171 | /* btrfs subvolumes have inode 256 */ |
172 | if (st.st_ino == 256) { | |
cd61c3bf | 173 | |
21222ea5 LP |
174 | r = btrfs_is_filesystem(fd); |
175 | if (r < 0) | |
176 | return r; | |
177 | if (r) { | |
10f9c755 | 178 | BtrfsSubvolInfo info; |
cd61c3bf | 179 | |
c2ce6a3d | 180 | /* It's a btrfs subvolume */ |
cd61c3bf | 181 | |
5bcd08db | 182 | r = btrfs_subvol_get_info_fd(fd, 0, &info); |
10f9c755 LP |
183 | if (r < 0) |
184 | return r; | |
c2ce6a3d LP |
185 | |
186 | r = image_new(IMAGE_SUBVOLUME, | |
5fc7f358 | 187 | pretty, |
c2ce6a3d | 188 | path, |
5fc7f358 LP |
189 | filename, |
190 | info.read_only || read_only, | |
10f9c755 | 191 | info.otime, |
c2ce6a3d | 192 | 0, |
c2ce6a3d LP |
193 | ret); |
194 | if (r < 0) | |
195 | return r; | |
196 | ||
5bcd08db LP |
197 | if (btrfs_quota_scan_ongoing(fd) == 0) { |
198 | BtrfsQuotaInfo quota; | |
b6b18498 | 199 | |
5bcd08db LP |
200 | r = btrfs_subvol_get_subtree_quota_fd(fd, 0, "a); |
201 | if (r >= 0) { | |
202 | (*ret)->usage = quota.referenced; | |
203 | (*ret)->usage_exclusive = quota.exclusive; | |
204 | ||
205 | (*ret)->limit = quota.referenced_max; | |
206 | (*ret)->limit_exclusive = quota.exclusive_max; | |
207 | } | |
b6b18498 LP |
208 | } |
209 | ||
c2ce6a3d | 210 | return 1; |
cd61c3bf | 211 | } |
c2ce6a3d | 212 | } |
cd61c3bf | 213 | |
01b72568 LP |
214 | /* If the IMMUTABLE bit is set, we consider the |
215 | * directory read-only. Since the ioctl is not | |
216 | * supported everywhere we ignore failures. */ | |
217 | (void) read_attr_fd(fd, &file_attr); | |
cd61c3bf | 218 | |
01b72568 | 219 | /* It's just a normal directory. */ |
c2ce6a3d | 220 | r = image_new(IMAGE_DIRECTORY, |
5fc7f358 | 221 | pretty, |
c2ce6a3d | 222 | path, |
5fc7f358 | 223 | filename, |
01b72568 | 224 | read_only || (file_attr & FS_IMMUTABLE_FL), |
c2ce6a3d LP |
225 | 0, |
226 | 0, | |
227 | ret); | |
228 | if (r < 0) | |
229 | return r; | |
cd61c3bf | 230 | |
c2ce6a3d | 231 | return 1; |
cd61c3bf | 232 | |
aceac2f0 | 233 | } else if (S_ISREG(st.st_mode) && endswith(filename, ".raw")) { |
10f9c755 | 234 | usec_t crtime = 0; |
cd61c3bf | 235 | |
aceac2f0 | 236 | /* It's a RAW disk image */ |
cd61c3bf | 237 | |
c2ce6a3d LP |
238 | if (!ret) |
239 | return 1; | |
cd61c3bf | 240 | |
5fc7f358 | 241 | fd_getcrtime_at(dfd, filename, &crtime, 0); |
10f9c755 | 242 | |
5fc7f358 LP |
243 | if (!pretty) |
244 | pretty = strndupa(filename, strlen(filename) - 4); | |
10f9c755 | 245 | |
aceac2f0 | 246 | r = image_new(IMAGE_RAW, |
5fc7f358 | 247 | pretty, |
c2ce6a3d | 248 | path, |
5fc7f358 LP |
249 | filename, |
250 | !(st.st_mode & 0222) || read_only, | |
10f9c755 | 251 | crtime, |
c2ce6a3d | 252 | timespec_load(&st.st_mtim), |
c2ce6a3d LP |
253 | ret); |
254 | if (r < 0) | |
255 | return r; | |
cd61c3bf | 256 | |
c19de711 | 257 | (*ret)->usage = (*ret)->usage_exclusive = st.st_blocks * 512; |
b6b18498 LP |
258 | (*ret)->limit = (*ret)->limit_exclusive = st.st_size; |
259 | ||
c2ce6a3d LP |
260 | return 1; |
261 | } | |
cd61c3bf | 262 | |
c2ce6a3d LP |
263 | return 0; |
264 | } | |
cd61c3bf | 265 | |
c2ce6a3d LP |
266 | int image_find(const char *name, Image **ret) { |
267 | const char *path; | |
268 | int r; | |
cd61c3bf | 269 | |
c2ce6a3d | 270 | assert(name); |
cd61c3bf | 271 | |
c2ce6a3d LP |
272 | /* There are no images with invalid names */ |
273 | if (!image_name_is_valid(name)) | |
274 | return 0; | |
cd61c3bf | 275 | |
c2ce6a3d LP |
276 | NULSTR_FOREACH(path, image_search_path) { |
277 | _cleanup_closedir_ DIR *d = NULL; | |
cd61c3bf | 278 | |
c2ce6a3d LP |
279 | d = opendir(path); |
280 | if (!d) { | |
281 | if (errno == ENOENT) | |
282 | continue; | |
cd61c3bf | 283 | |
c2ce6a3d LP |
284 | return -errno; |
285 | } | |
cd61c3bf | 286 | |
5fc7f358 LP |
287 | r = image_make(NULL, dirfd(d), path, name, ret); |
288 | if (r == 0 || r == -ENOENT) { | |
aceac2f0 | 289 | _cleanup_free_ char *raw = NULL; |
5fc7f358 | 290 | |
aceac2f0 LP |
291 | raw = strappend(name, ".raw"); |
292 | if (!raw) | |
5fc7f358 LP |
293 | return -ENOMEM; |
294 | ||
aceac2f0 | 295 | r = image_make(NULL, dirfd(d), path, raw, ret); |
5fc7f358 LP |
296 | if (r == 0 || r == -ENOENT) |
297 | continue; | |
298 | } | |
c2ce6a3d LP |
299 | if (r < 0) |
300 | return r; | |
cd61c3bf | 301 | |
c2ce6a3d LP |
302 | return 1; |
303 | } | |
304 | ||
5fc7f358 | 305 | if (streq(name, ".host")) |
27c88c4e | 306 | return image_make(".host", AT_FDCWD, NULL, "/", ret); |
5fc7f358 | 307 | |
c2ce6a3d LP |
308 | return 0; |
309 | }; | |
310 | ||
311 | int image_discover(Hashmap *h) { | |
312 | const char *path; | |
313 | int r; | |
314 | ||
315 | assert(h); | |
316 | ||
317 | NULSTR_FOREACH(path, image_search_path) { | |
318 | _cleanup_closedir_ DIR *d = NULL; | |
319 | struct dirent *de; | |
320 | ||
321 | d = opendir(path); | |
322 | if (!d) { | |
323 | if (errno == ENOENT) | |
a67a4c8c | 324 | continue; |
c2ce6a3d LP |
325 | |
326 | return -errno; | |
327 | } | |
328 | ||
329 | FOREACH_DIRENT_ALL(de, d, return -errno) { | |
330 | _cleanup_(image_unrefp) Image *image = NULL; | |
331 | ||
332 | if (!image_name_is_valid(de->d_name)) | |
333 | continue; | |
334 | ||
335 | if (hashmap_contains(h, de->d_name)) | |
336 | continue; | |
337 | ||
5fc7f358 | 338 | r = image_make(NULL, dirfd(d), path, de->d_name, &image); |
c2ce6a3d LP |
339 | if (r == 0 || r == -ENOENT) |
340 | continue; | |
341 | if (r < 0) | |
342 | return r; | |
343 | ||
344 | r = hashmap_put(h, image->name, image); | |
345 | if (r < 0) | |
346 | return r; | |
347 | ||
348 | image = NULL; | |
cd61c3bf LP |
349 | } |
350 | } | |
351 | ||
5fc7f358 LP |
352 | if (!hashmap_contains(h, ".host")) { |
353 | _cleanup_(image_unrefp) Image *image = NULL; | |
354 | ||
355 | r = image_make(".host", AT_FDCWD, NULL, "/", &image); | |
356 | if (r < 0) | |
357 | return r; | |
358 | ||
359 | r = hashmap_put(h, image->name, image); | |
360 | if (r < 0) | |
361 | return r; | |
362 | ||
363 | image = NULL; | |
364 | ||
365 | } | |
366 | ||
cd61c3bf LP |
367 | return 0; |
368 | } | |
369 | ||
370 | void image_hashmap_free(Hashmap *map) { | |
371 | Image *i; | |
372 | ||
373 | while ((i = hashmap_steal_first(map))) | |
374 | image_unref(i); | |
375 | ||
376 | hashmap_free(map); | |
377 | } | |
378 | ||
08682124 | 379 | int image_remove(Image *i) { |
30535c16 | 380 | _cleanup_release_lock_file_ LockFile global_lock = LOCK_FILE_INIT, local_lock = LOCK_FILE_INIT; |
8e0b6570 LP |
381 | _cleanup_strv_free_ char **settings = NULL; |
382 | char **j; | |
30535c16 LP |
383 | int r; |
384 | ||
08682124 LP |
385 | assert(i); |
386 | ||
387 | if (path_equal(i->path, "/") || | |
388 | path_startswith(i->path, "/usr")) | |
389 | return -EROFS; | |
390 | ||
8e0b6570 LP |
391 | settings = image_settings_path(i); |
392 | if (!settings) | |
393 | return -ENOMEM; | |
394 | ||
30535c16 LP |
395 | /* Make sure we don't interfere with a running nspawn */ |
396 | r = image_path_lock(i->path, LOCK_EX|LOCK_NB, &global_lock, &local_lock); | |
397 | if (r < 0) | |
398 | return r; | |
399 | ||
ebd93cb6 LP |
400 | switch (i->type) { |
401 | ||
402 | case IMAGE_SUBVOLUME: | |
5bcd08db | 403 | r = btrfs_subvol_remove(i->path, BTRFS_REMOVE_RECURSIVE|BTRFS_REMOVE_QUOTA); |
8e0b6570 LP |
404 | if (r < 0) |
405 | return r; | |
406 | break; | |
ebd93cb6 LP |
407 | |
408 | case IMAGE_DIRECTORY: | |
01b72568 LP |
409 | /* Allow deletion of read-only directories */ |
410 | (void) chattr_path(i->path, false, FS_IMMUTABLE_FL); | |
8e0b6570 LP |
411 | r = rm_rf(i->path, REMOVE_ROOT|REMOVE_PHYSICAL|REMOVE_SUBVOLUME); |
412 | if (r < 0) | |
413 | return r; | |
414 | ||
415 | break; | |
01b72568 | 416 | |
aceac2f0 | 417 | case IMAGE_RAW: |
41d1ed05 LP |
418 | if (unlink(i->path) < 0) |
419 | return -errno; | |
8e0b6570 | 420 | break; |
ebd93cb6 LP |
421 | |
422 | default: | |
15411c0c | 423 | return -EOPNOTSUPP; |
ebd93cb6 | 424 | } |
8e0b6570 LP |
425 | |
426 | STRV_FOREACH(j, settings) { | |
427 | if (unlink(*j) < 0 && errno != ENOENT) | |
428 | log_debug_errno(errno, "Failed to unlink %s, ignoring: %m", *j); | |
429 | } | |
430 | ||
431 | return 0; | |
432 | } | |
433 | ||
434 | static int rename_settings_file(const char *path, const char *new_name) { | |
435 | _cleanup_free_ char *rs = NULL; | |
436 | const char *fn; | |
437 | ||
438 | fn = strjoina(new_name, ".nspawn"); | |
439 | ||
440 | rs = file_in_same_dir(path, fn); | |
441 | if (!rs) | |
442 | return -ENOMEM; | |
443 | ||
444 | return rename_noreplace(AT_FDCWD, path, AT_FDCWD, rs); | |
ebd93cb6 LP |
445 | } |
446 | ||
447 | int image_rename(Image *i, const char *new_name) { | |
30535c16 | 448 | _cleanup_release_lock_file_ LockFile global_lock = LOCK_FILE_INIT, local_lock = LOCK_FILE_INIT, name_lock = LOCK_FILE_INIT; |
ebd93cb6 | 449 | _cleanup_free_ char *new_path = NULL, *nn = NULL; |
8e0b6570 | 450 | _cleanup_strv_free_ char **settings = NULL; |
01b72568 | 451 | unsigned file_attr = 0; |
8e0b6570 | 452 | char **j; |
ebd93cb6 LP |
453 | int r; |
454 | ||
455 | assert(i); | |
456 | ||
457 | if (!image_name_is_valid(new_name)) | |
458 | return -EINVAL; | |
459 | ||
460 | if (path_equal(i->path, "/") || | |
461 | path_startswith(i->path, "/usr")) | |
462 | return -EROFS; | |
463 | ||
8e0b6570 LP |
464 | settings = image_settings_path(i); |
465 | if (!settings) | |
466 | return -ENOMEM; | |
467 | ||
30535c16 LP |
468 | /* Make sure we don't interfere with a running nspawn */ |
469 | r = image_path_lock(i->path, LOCK_EX|LOCK_NB, &global_lock, &local_lock); | |
470 | if (r < 0) | |
471 | return r; | |
472 | ||
473 | /* Make sure nobody takes the new name, between the time we | |
474 | * checked it is currently unused in all search paths, and the | |
475 | * time we take possesion of it */ | |
476 | r = image_name_lock(new_name, LOCK_EX|LOCK_NB, &name_lock); | |
477 | if (r < 0) | |
478 | return r; | |
479 | ||
ebd93cb6 LP |
480 | r = image_find(new_name, NULL); |
481 | if (r < 0) | |
482 | return r; | |
483 | if (r > 0) | |
484 | return -EEXIST; | |
485 | ||
486 | switch (i->type) { | |
487 | ||
ebd93cb6 | 488 | case IMAGE_DIRECTORY: |
01b72568 LP |
489 | /* Turn of the immutable bit while we rename the image, so that we can rename it */ |
490 | (void) read_attr_path(i->path, &file_attr); | |
491 | ||
492 | if (file_attr & FS_IMMUTABLE_FL) | |
493 | (void) chattr_path(i->path, false, FS_IMMUTABLE_FL); | |
494 | ||
495 | /* fall through */ | |
496 | ||
497 | case IMAGE_SUBVOLUME: | |
ebd93cb6 LP |
498 | new_path = file_in_same_dir(i->path, new_name); |
499 | break; | |
500 | ||
aceac2f0 | 501 | case IMAGE_RAW: { |
ebd93cb6 LP |
502 | const char *fn; |
503 | ||
63c372cb | 504 | fn = strjoina(new_name, ".raw"); |
ebd93cb6 LP |
505 | new_path = file_in_same_dir(i->path, fn); |
506 | break; | |
507 | } | |
508 | ||
509 | default: | |
15411c0c | 510 | return -EOPNOTSUPP; |
ebd93cb6 LP |
511 | } |
512 | ||
513 | if (!new_path) | |
514 | return -ENOMEM; | |
515 | ||
516 | nn = strdup(new_name); | |
517 | if (!nn) | |
518 | return -ENOMEM; | |
519 | ||
f85ef957 AC |
520 | r = rename_noreplace(AT_FDCWD, i->path, AT_FDCWD, new_path); |
521 | if (r < 0) | |
522 | return r; | |
ebd93cb6 | 523 | |
01b72568 LP |
524 | /* Restore the immutable bit, if it was set before */ |
525 | if (file_attr & FS_IMMUTABLE_FL) | |
526 | (void) chattr_path(new_path, true, FS_IMMUTABLE_FL); | |
527 | ||
ebd93cb6 LP |
528 | free(i->path); |
529 | i->path = new_path; | |
530 | new_path = NULL; | |
531 | ||
532 | free(i->name); | |
533 | i->name = nn; | |
534 | nn = NULL; | |
535 | ||
8e0b6570 LP |
536 | STRV_FOREACH(j, settings) { |
537 | r = rename_settings_file(*j, new_name); | |
538 | if (r < 0 && r != -ENOENT) | |
539 | log_debug_errno(r, "Failed to rename settings file %s, ignoring: %m", *j); | |
540 | } | |
541 | ||
ebd93cb6 LP |
542 | return 0; |
543 | } | |
544 | ||
8e0b6570 LP |
545 | static int clone_settings_file(const char *path, const char *new_name) { |
546 | _cleanup_free_ char *rs = NULL; | |
547 | const char *fn; | |
548 | ||
549 | fn = strjoina(new_name, ".nspawn"); | |
550 | ||
551 | rs = file_in_same_dir(path, fn); | |
552 | if (!rs) | |
553 | return -ENOMEM; | |
554 | ||
555 | return copy_file_atomic(path, rs, 0664, false, 0); | |
556 | } | |
557 | ||
ebd93cb6 | 558 | int image_clone(Image *i, const char *new_name, bool read_only) { |
30535c16 | 559 | _cleanup_release_lock_file_ LockFile name_lock = LOCK_FILE_INIT; |
8e0b6570 | 560 | _cleanup_strv_free_ char **settings = NULL; |
ebd93cb6 | 561 | const char *new_path; |
8e0b6570 | 562 | char **j; |
ebd93cb6 LP |
563 | int r; |
564 | ||
565 | assert(i); | |
566 | ||
567 | if (!image_name_is_valid(new_name)) | |
568 | return -EINVAL; | |
569 | ||
8e0b6570 LP |
570 | settings = image_settings_path(i); |
571 | if (!settings) | |
572 | return -ENOMEM; | |
573 | ||
30535c16 LP |
574 | /* Make sure nobody takes the new name, between the time we |
575 | * checked it is currently unused in all search paths, and the | |
576 | * time we take possesion of it */ | |
577 | r = image_name_lock(new_name, LOCK_EX|LOCK_NB, &name_lock); | |
578 | if (r < 0) | |
579 | return r; | |
580 | ||
ebd93cb6 LP |
581 | r = image_find(new_name, NULL); |
582 | if (r < 0) | |
583 | return r; | |
584 | if (r > 0) | |
585 | return -EEXIST; | |
586 | ||
587 | switch (i->type) { | |
588 | ||
589 | case IMAGE_SUBVOLUME: | |
590 | case IMAGE_DIRECTORY: | |
63c372cb | 591 | new_path = strjoina("/var/lib/machines/", new_name); |
ebd93cb6 | 592 | |
5bcd08db LP |
593 | r = btrfs_subvol_snapshot(i->path, new_path, (read_only ? BTRFS_SNAPSHOT_READ_ONLY : 0) | BTRFS_SNAPSHOT_FALLBACK_COPY | BTRFS_SNAPSHOT_RECURSIVE | BTRFS_SNAPSHOT_QUOTA); |
594 | ||
595 | /* Enable "subtree" quotas for the copy, if we didn't | |
596 | * copy any quota from the source. */ | |
597 | (void) btrfs_subvol_auto_qgroup(i->path, 0, true); | |
598 | ||
ebd93cb6 LP |
599 | break; |
600 | ||
aceac2f0 | 601 | case IMAGE_RAW: |
63c372cb | 602 | new_path = strjoina("/var/lib/machines/", new_name, ".raw"); |
ebd93cb6 | 603 | |
f2068bcc | 604 | r = copy_file_atomic(i->path, new_path, read_only ? 0444 : 0644, false, FS_NOCOW_FL); |
ebd93cb6 LP |
605 | break; |
606 | ||
607 | default: | |
15411c0c | 608 | return -EOPNOTSUPP; |
ebd93cb6 LP |
609 | } |
610 | ||
611 | if (r < 0) | |
612 | return r; | |
613 | ||
8e0b6570 LP |
614 | STRV_FOREACH(j, settings) { |
615 | r = clone_settings_file(*j, new_name); | |
616 | if (r < 0 && r != -ENOENT) | |
617 | log_debug_errno(r, "Failed to clone settings %s, ignoring: %m", *j); | |
618 | } | |
619 | ||
ebd93cb6 LP |
620 | return 0; |
621 | } | |
622 | ||
623 | int image_read_only(Image *i, bool b) { | |
30535c16 | 624 | _cleanup_release_lock_file_ LockFile global_lock = LOCK_FILE_INIT, local_lock = LOCK_FILE_INIT; |
ebd93cb6 LP |
625 | int r; |
626 | assert(i); | |
627 | ||
628 | if (path_equal(i->path, "/") || | |
629 | path_startswith(i->path, "/usr")) | |
630 | return -EROFS; | |
631 | ||
30535c16 LP |
632 | /* Make sure we don't interfere with a running nspawn */ |
633 | r = image_path_lock(i->path, LOCK_EX|LOCK_NB, &global_lock, &local_lock); | |
634 | if (r < 0) | |
635 | return r; | |
636 | ||
ebd93cb6 LP |
637 | switch (i->type) { |
638 | ||
639 | case IMAGE_SUBVOLUME: | |
5bcd08db LP |
640 | |
641 | /* Note that we set the flag only on the top-level | |
642 | * subvolume of the image. */ | |
643 | ||
ebd93cb6 LP |
644 | r = btrfs_subvol_set_read_only(i->path, b); |
645 | if (r < 0) | |
646 | return r; | |
01b72568 LP |
647 | |
648 | break; | |
649 | ||
650 | case IMAGE_DIRECTORY: | |
651 | /* For simple directory trees we cannot use the access | |
652 | mode of the top-level directory, since it has an | |
653 | effect on the container itself. However, we can | |
654 | use the "immutable" flag, to at least make the | |
655 | top-level directory read-only. It's not as good as | |
656 | a read-only subvolume, but at least something, and | |
657 | we can read the value back.*/ | |
658 | ||
659 | r = chattr_path(i->path, b, FS_IMMUTABLE_FL); | |
660 | if (r < 0) | |
661 | return r; | |
662 | ||
ebd93cb6 LP |
663 | break; |
664 | ||
aceac2f0 | 665 | case IMAGE_RAW: { |
ebd93cb6 LP |
666 | struct stat st; |
667 | ||
668 | if (stat(i->path, &st) < 0) | |
669 | return -errno; | |
670 | ||
671 | if (chmod(i->path, (st.st_mode & 0444) | (b ? 0000 : 0200)) < 0) | |
672 | return -errno; | |
f2068bcc LP |
673 | |
674 | /* If the images is now read-only, it's a good time to | |
675 | * defrag it, given that no write patterns will | |
676 | * fragment it again. */ | |
677 | if (b) | |
678 | (void) btrfs_defrag(i->path); | |
ebd93cb6 LP |
679 | break; |
680 | } | |
681 | ||
ebd93cb6 | 682 | default: |
15411c0c | 683 | return -EOPNOTSUPP; |
ebd93cb6 LP |
684 | } |
685 | ||
686 | return 0; | |
08682124 LP |
687 | } |
688 | ||
30535c16 LP |
689 | int image_path_lock(const char *path, int operation, LockFile *global, LockFile *local) { |
690 | _cleanup_free_ char *p = NULL; | |
691 | LockFile t = LOCK_FILE_INIT; | |
692 | struct stat st; | |
693 | int r; | |
694 | ||
695 | assert(path); | |
696 | assert(global); | |
697 | assert(local); | |
698 | ||
699 | /* Locks an image path. This actually creates two locks: one | |
700 | * "local" one, next to the image path itself, which might be | |
701 | * shared via NFS. And another "global" one, in /run, that | |
702 | * uses the device/inode number. This has the benefit that we | |
703 | * can even lock a tree that is a mount point, correctly. */ | |
704 | ||
705 | if (path_equal(path, "/")) | |
706 | return -EBUSY; | |
707 | ||
708 | if (!path_is_absolute(path)) | |
709 | return -EINVAL; | |
710 | ||
711 | if (stat(path, &st) >= 0) { | |
712 | if (asprintf(&p, "/run/systemd/nspawn/locks/inode-%lu:%lu", (unsigned long) st.st_dev, (unsigned long) st.st_ino) < 0) | |
713 | return -ENOMEM; | |
714 | } | |
715 | ||
716 | r = make_lock_file_for(path, operation, &t); | |
717 | if (r < 0) | |
718 | return r; | |
719 | ||
720 | if (p) { | |
7e7cddb2 | 721 | mkdir_p("/run/systemd/nspawn/locks", 0700); |
30535c16 LP |
722 | |
723 | r = make_lock_file(p, operation, global); | |
724 | if (r < 0) { | |
725 | release_lock_file(&t); | |
726 | return r; | |
727 | } | |
728 | } | |
729 | ||
730 | *local = t; | |
731 | return 0; | |
732 | } | |
733 | ||
cb81cd80 | 734 | int image_set_limit(Image *i, uint64_t referenced_max) { |
d6ce17c7 LP |
735 | assert(i); |
736 | ||
737 | if (path_equal(i->path, "/") || | |
738 | path_startswith(i->path, "/usr")) | |
739 | return -EROFS; | |
740 | ||
741 | if (i->type != IMAGE_SUBVOLUME) | |
15411c0c | 742 | return -EOPNOTSUPP; |
d6ce17c7 | 743 | |
5bcd08db LP |
744 | /* We set the quota both for the subvolume as well as for the |
745 | * subtree. The latter is mostly for historical reasons, since | |
746 | * we didn't use to have a concept of subtree quota, and hence | |
747 | * only modified the subvolume quota. */ | |
748 | ||
749 | (void) btrfs_qgroup_set_limit(i->path, 0, referenced_max); | |
750 | (void) btrfs_subvol_auto_qgroup(i->path, 0, true); | |
751 | return btrfs_subvol_set_subtree_quota_limit(i->path, 0, referenced_max); | |
d6ce17c7 LP |
752 | } |
753 | ||
30535c16 LP |
754 | int image_name_lock(const char *name, int operation, LockFile *ret) { |
755 | const char *p; | |
756 | ||
757 | assert(name); | |
758 | assert(ret); | |
759 | ||
760 | /* Locks an image name, regardless of the precise path used. */ | |
761 | ||
762 | if (!image_name_is_valid(name)) | |
763 | return -EINVAL; | |
764 | ||
765 | if (streq(name, ".host")) | |
766 | return -EBUSY; | |
767 | ||
7e7cddb2 | 768 | mkdir_p("/run/systemd/nspawn/locks", 0700); |
63c372cb | 769 | p = strjoina("/run/systemd/nspawn/locks/name-", name); |
30535c16 LP |
770 | |
771 | return make_lock_file(p, operation, ret); | |
772 | } | |
773 | ||
774 | bool image_name_is_valid(const char *s) { | |
775 | if (!filename_is_valid(s)) | |
776 | return false; | |
777 | ||
778 | if (string_has_cc(s, NULL)) | |
779 | return false; | |
780 | ||
781 | if (!utf8_is_valid(s)) | |
782 | return false; | |
783 | ||
784 | /* Temporary files for atomically creating new files */ | |
785 | if (startswith(s, ".#")) | |
786 | return false; | |
787 | ||
788 | return true; | |
789 | } | |
790 | ||
cd61c3bf LP |
791 | static const char* const image_type_table[_IMAGE_TYPE_MAX] = { |
792 | [IMAGE_DIRECTORY] = "directory", | |
793 | [IMAGE_SUBVOLUME] = "subvolume", | |
aceac2f0 | 794 | [IMAGE_RAW] = "raw", |
cd61c3bf LP |
795 | }; |
796 | ||
797 | DEFINE_STRING_TABLE_LOOKUP(image_type, ImageType); |