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Commit | Line | Data |
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72d0e1cb SG |
1 | /* liblxcapi |
2 | * | |
3 | * Copyright © 2012 Serge Hallyn <serge.hallyn@ubuntu.com>. | |
4 | * Copyright © 2012 Canonical Ltd. | |
5 | * | |
d75462e4 SH |
6 | * This library is free software; you can redistribute it and/or |
7 | * modify it under the terms of the GNU Lesser General Public | |
8 | * License as published by the Free Software Foundation; either | |
9 | * version 2.1 of the License, or (at your option) any later version. | |
10 | ||
11 | * This library is distributed in the hope that it will be useful, | |
12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
14 | * Lesser General Public License for more details. | |
15 | ||
16 | * You should have received a copy of the GNU Lesser General Public | |
17 | * License along with this library; if not, write to the Free Software | |
18 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA | |
72d0e1cb SG |
19 | */ |
20 | ||
9be53773 | 21 | #define _GNU_SOURCE |
38683db4 | 22 | #include <dirent.h> |
9be53773 | 23 | #include <errno.h> |
93dc5327 | 24 | #include <fcntl.h> |
38683db4 | 25 | #include <grp.h> |
f2363e38 | 26 | #include <libgen.h> |
38683db4 CB |
27 | #include <pthread.h> |
28 | #include <sched.h> | |
29 | #include <stdarg.h> | |
d659597e | 30 | #include <stdint.h> |
9fc7f8c0 | 31 | #include <stdio.h> |
38683db4 CB |
32 | #include <unistd.h> |
33 | #include <arpa/inet.h> | |
66c1f8c2 | 34 | #include <sys/sysmacros.h> |
38683db4 CB |
35 | #include <sys/mman.h> |
36 | #include <sys/mount.h> | |
5f7eba0b | 37 | #include <sys/syscall.h> |
38683db4 CB |
38 | #include <sys/types.h> |
39 | #include <sys/wait.h> | |
f2363e38 | 40 | |
5e5576a4 | 41 | #include "af_unix.h" |
38683db4 | 42 | #include "attach.h" |
38683db4 | 43 | #include "cgroup.h" |
72d0e1cb | 44 | #include "conf.h" |
38683db4 CB |
45 | #include "config.h" |
46 | #include "commands.h" | |
92e35018 | 47 | #include "commands_utils.h" |
72d0e1cb | 48 | #include "confile.h" |
4222a9f4 | 49 | #include "confile_utils.h" |
b5159817 | 50 | #include "console.h" |
e29fe1dd | 51 | #include "criu.h" |
238b3e5e | 52 | #include "error.h" |
a6f151a7 | 53 | #include "initutils.h" |
72d0e1cb | 54 | #include "log.h" |
38683db4 CB |
55 | #include "lxc.h" |
56 | #include "lxccontainer.h" | |
57 | #include "lxclock.h" | |
f2363e38 ÇO |
58 | #include "monitor.h" |
59 | #include "namespace.h" | |
fed29fad | 60 | #include "network.h" |
9994d140 | 61 | #include "parse.h" |
aa460476 | 62 | #include "start.h" |
38683db4 | 63 | #include "state.h" |
28d832c4 | 64 | #include "storage.h" |
ec5d663c | 65 | #include "storage_utils.h" |
28d832c4 CB |
66 | #include "storage/btrfs.h" |
67 | #include "storage/overlay.h" | |
68 | #include "sync.h" | |
38683db4 CB |
69 | #include "utils.h" |
70 | #include "version.h" | |
4ba0d9af | 71 | |
af6824fc ST |
72 | /* major()/minor() */ |
73 | #ifdef MAJOR_IN_MKDEV | |
238b3e5e | 74 | #include <sys/mkdev.h> |
af6824fc | 75 | #endif |
af6824fc | 76 | |
4ba0d9af | 77 | #if HAVE_IFADDRS_H |
9c83a661 | 78 | #include <ifaddrs.h> |
4ba0d9af SG |
79 | #else |
80 | #include <../include/ifaddrs.h> | |
81 | #endif | |
72d0e1cb | 82 | |
684f79a5 SG |
83 | #if IS_BIONIC |
84 | #include <../include/lxcmntent.h> | |
85 | #else | |
86 | #include <mntent.h> | |
87 | #endif | |
88 | ||
5f7eba0b SG |
89 | /* Define faccessat() if missing from the C library */ |
90 | #ifndef HAVE_FACCESSAT | |
91 | static int faccessat(int __fd, const char *__file, int __type, int __flag) | |
92 | { | |
93 | #ifdef __NR_faccessat | |
238b3e5e | 94 | return syscall(__NR_faccessat, __fd, __file, __type, __flag); |
5f7eba0b | 95 | #else |
238b3e5e CB |
96 | errno = ENOSYS; |
97 | return -1; | |
5f7eba0b SG |
98 | #endif |
99 | } | |
100 | #endif | |
101 | ||
72d0e1cb SG |
102 | lxc_log_define(lxc_container, lxc); |
103 | ||
858377e4 SH |
104 | static bool do_lxcapi_destroy(struct lxc_container *c); |
105 | static const char *lxcapi_get_config_path(struct lxc_container *c); | |
106 | #define do_lxcapi_get_config_path(c) lxcapi_get_config_path(c) | |
107 | static bool do_lxcapi_set_config_item(struct lxc_container *c, const char *key, const char *v); | |
17a367d8 CB |
108 | static bool container_destroy(struct lxc_container *c, |
109 | struct lxc_storage *storage); | |
858377e4 SH |
110 | static bool get_snappath_dir(struct lxc_container *c, char *snappath); |
111 | static bool lxcapi_snapshot_destroy_all(struct lxc_container *c); | |
112 | static bool do_lxcapi_save_config(struct lxc_container *c, const char *alt_file); | |
113 | ||
a41f104b SH |
114 | static bool config_file_exists(const char *lxcpath, const char *cname) |
115 | { | |
ef1ab8f1 CB |
116 | int ret; |
117 | size_t len; | |
118 | char *fname; | |
a41f104b | 119 | |
ef1ab8f1 CB |
120 | /* $lxcpath + '/' + $cname + '/config' + \0 */ |
121 | len = strlen(lxcpath) + strlen(cname) + 9; | |
122 | fname = alloca(len); | |
123 | ret = snprintf(fname, len, "%s/%s/config", lxcpath, cname); | |
124 | if (ret < 0 || (size_t)ret >= len) | |
a41f104b SH |
125 | return false; |
126 | ||
127 | return file_exists(fname); | |
128 | } | |
129 | ||
444249ea CB |
130 | /* A few functions to help detect when a container creation failed. If a |
131 | * container creation was killed partway through, then trying to actually start | |
132 | * that container could harm the host. We detect this by creating a 'partial' | |
133 | * file under the container directory, and keeping an advisory lock. When | |
134 | * container creation completes, we remove that file. When we load or try to | |
135 | * start a container, if we find that file, without a flock, we remove the | |
136 | * container. | |
3e625e2d | 137 | */ |
74a3920a | 138 | static int ongoing_create(struct lxc_container *c) |
3e625e2d | 139 | { |
3e625e2d | 140 | int fd, ret; |
444249ea CB |
141 | size_t len; |
142 | char *path; | |
93dc5327 SH |
143 | struct flock lk; |
144 | ||
444249ea CB |
145 | len = strlen(c->config_path) + strlen(c->name) + 10; |
146 | path = alloca(len); | |
3e625e2d | 147 | ret = snprintf(path, len, "%s/%s/partial", c->config_path, c->name); |
444249ea | 148 | if (ret < 0 || (size_t)ret >= len) |
3e625e2d | 149 | return -1; |
3e625e2d SH |
150 | |
151 | if (!file_exists(path)) | |
152 | return 0; | |
444249ea | 153 | |
025ed0f3 | 154 | fd = open(path, O_RDWR); |
444249ea | 155 | if (fd < 0) |
3e625e2d | 156 | return 0; |
444249ea | 157 | |
93dc5327 SH |
158 | lk.l_type = F_WRLCK; |
159 | lk.l_whence = SEEK_SET; | |
160 | lk.l_start = 0; | |
161 | lk.l_len = 0; | |
162 | lk.l_pid = -1; | |
444249ea CB |
163 | |
164 | ret = fcntl(fd, F_GETLK, &lk); | |
165 | close(fd); | |
166 | if (ret == 0 && lk.l_pid != -1) { | |
1a0e70ac | 167 | /* create is still ongoing */ |
3e625e2d SH |
168 | return 1; |
169 | } | |
444249ea CB |
170 | |
171 | /* Create completed but partial is still there. */ | |
3e625e2d SH |
172 | return 2; |
173 | } | |
174 | ||
74a3920a | 175 | static int create_partial(struct lxc_container *c) |
3e625e2d | 176 | { |
3e625e2d | 177 | int fd, ret; |
f5cd0252 CB |
178 | size_t len; |
179 | char *path; | |
93dc5327 SH |
180 | struct flock lk; |
181 | ||
f5cd0252 CB |
182 | /* $lxcpath + '/' + $name + '/partial' + \0 */ |
183 | len = strlen(c->config_path) + strlen(c->name) + 10; | |
184 | path = alloca(len); | |
3e625e2d | 185 | ret = snprintf(path, len, "%s/%s/partial", c->config_path, c->name); |
f5cd0252 | 186 | if (ret < 0 || (size_t)ret >= len) |
3e625e2d | 187 | return -1; |
f5cd0252 CB |
188 | |
189 | fd = open(path, O_RDWR | O_CREAT | O_EXCL, 0755); | |
190 | if (fd < 0) | |
3e625e2d | 191 | return -1; |
f5cd0252 | 192 | |
93dc5327 SH |
193 | lk.l_type = F_WRLCK; |
194 | lk.l_whence = SEEK_SET; | |
195 | lk.l_start = 0; | |
196 | lk.l_len = 0; | |
f5cd0252 CB |
197 | |
198 | ret = fcntl(fd, F_SETLKW, &lk); | |
199 | if (ret < 0) { | |
200 | SYSERROR("Failed to lock partial file %s", path); | |
3e625e2d | 201 | close(fd); |
3e625e2d SH |
202 | return -1; |
203 | } | |
3e625e2d SH |
204 | |
205 | return fd; | |
206 | } | |
207 | ||
74a3920a | 208 | static void remove_partial(struct lxc_container *c, int fd) |
3e625e2d | 209 | { |
1a0e70ac | 210 | /* $lxcpath + '/' + $name + '/partial' + \0 */ |
3e625e2d SH |
211 | int len = strlen(c->config_path) + strlen(c->name) + 10; |
212 | char *path = alloca(len); | |
213 | int ret; | |
214 | ||
215 | close(fd); | |
216 | ret = snprintf(path, len, "%s/%s/partial", c->config_path, c->name); | |
217 | if (ret < 0 || ret >= len) { | |
218 | ERROR("Error writing partial pathname"); | |
219 | return; | |
220 | } | |
3e625e2d SH |
221 | if (unlink(path) < 0) |
222 | SYSERROR("Error unlink partial file %s", path); | |
3e625e2d SH |
223 | } |
224 | ||
72d0e1cb | 225 | /* LOCKING |
3bc449ed SH |
226 | * 1. container_mem_lock(c) protects the struct lxc_container from multiple threads. |
227 | * 2. container_disk_lock(c) protects the on-disk container data - in particular the | |
228 | * container configuration file. | |
229 | * The container_disk_lock also takes the container_mem_lock. | |
230 | * 3. thread_mutex protects process data (ex: fd table) from multiple threads. | |
72d0e1cb SG |
231 | * NOTHING mutexes two independent programs with their own struct |
232 | * lxc_container for the same c->name, between API calls. For instance, | |
233 | * c->config_read(); c->start(); Between those calls, data on disk | |
234 | * could change (which shouldn't bother the caller unless for instance | |
235 | * the rootfs get moved). c->config_read(); update; c->config_write(); | |
236 | * Two such updaters could race. The callers should therefore check their | |
237 | * results. Trying to prevent that would necessarily expose us to deadlocks | |
238 | * due to hung callers. So I prefer to keep the locks only within our own | |
239 | * functions, not across functions. | |
240 | * | |
3bc449ed | 241 | * If you're going to clone while holding a lxccontainer, increment |
72d0e1cb SG |
242 | * c->numthreads (under privlock) before forking. When deleting, |
243 | * decrement numthreads under privlock, then if it hits 0 you can delete. | |
244 | * Do not ever use a lxccontainer whose numthreads you did not bump. | |
245 | */ | |
246 | ||
247 | static void lxc_container_free(struct lxc_container *c) | |
248 | { | |
249 | if (!c) | |
250 | return; | |
251 | ||
f10fad2f ME |
252 | free(c->configfile); |
253 | c->configfile = NULL; | |
254 | free(c->error_string); | |
255 | c->error_string = NULL; | |
d95db067 | 256 | if (c->slock) { |
df271a59 | 257 | lxc_putlock(c->slock); |
d95db067 DE |
258 | c->slock = NULL; |
259 | } | |
72d0e1cb | 260 | if (c->privlock) { |
df271a59 | 261 | lxc_putlock(c->privlock); |
72d0e1cb SG |
262 | c->privlock = NULL; |
263 | } | |
f10fad2f ME |
264 | free(c->name); |
265 | c->name = NULL; | |
d95db067 DE |
266 | if (c->lxc_conf) { |
267 | lxc_conf_free(c->lxc_conf); | |
268 | c->lxc_conf = NULL; | |
269 | } | |
f10fad2f ME |
270 | free(c->config_path); |
271 | c->config_path = NULL; | |
72cf75fa | 272 | |
72d0e1cb SG |
273 | free(c); |
274 | } | |
275 | ||
43d1aa34 SH |
276 | /* |
277 | * Consider the following case: | |
278 | freer | racing get()er | |
279 | ================================================================== | |
280 | lxc_container_put() | lxc_container_get() | |
281 | \ lxclock(c->privlock) | c->numthreads < 1? (no) | |
282 | \ c->numthreads = 0 | \ lxclock(c->privlock) -> waits | |
283 | \ lxcunlock() | \ | |
284 | \ lxc_container_free() | \ lxclock() returns | |
285 | | \ c->numthreads < 1 -> return 0 | |
286 | \ \ (free stuff) | | |
287 | \ \ sem_destroy(privlock) | | |
288 | ||
289 | * When the get()er checks numthreads the first time, one of the following | |
290 | * is true: | |
291 | * 1. freer has set numthreads = 0. get() returns 0 | |
292 | * 2. freer is between lxclock and setting numthreads to 0. get()er will | |
293 | * sem_wait on privlock, get lxclock after freer() drops it, then see | |
294 | * numthreads is 0 and exit without touching lxclock again.. | |
295 | * 3. freer has not yet locked privlock. If get()er runs first, then put()er | |
296 | * will see --numthreads = 1 and not call lxc_container_free(). | |
297 | */ | |
298 | ||
72d0e1cb SG |
299 | int lxc_container_get(struct lxc_container *c) |
300 | { | |
301 | if (!c) | |
302 | return 0; | |
303 | ||
1a0e70ac CB |
304 | /* If someone else has already started freeing the container, don't try |
305 | * to take the lock, which may be invalid. | |
306 | */ | |
43d1aa34 SH |
307 | if (c->numthreads < 1) |
308 | return 0; | |
309 | ||
5cee8c50 | 310 | if (container_mem_lock(c)) |
72d0e1cb | 311 | return 0; |
1a0e70ac CB |
312 | |
313 | /* Bail without trying to unlock, bc the privlock is now probably in | |
314 | * freed memory. | |
315 | */ | |
316 | if (c->numthreads < 1) | |
72d0e1cb | 317 | return 0; |
1a0e70ac | 318 | |
72d0e1cb | 319 | c->numthreads++; |
5cee8c50 | 320 | container_mem_unlock(c); |
72d0e1cb SG |
321 | return 1; |
322 | } | |
323 | ||
324 | int lxc_container_put(struct lxc_container *c) | |
325 | { | |
326 | if (!c) | |
327 | return -1; | |
5cee8c50 | 328 | if (container_mem_lock(c)) |
72d0e1cb SG |
329 | return -1; |
330 | if (--c->numthreads < 1) { | |
5cee8c50 | 331 | container_mem_unlock(c); |
72d0e1cb SG |
332 | lxc_container_free(c); |
333 | return 1; | |
334 | } | |
5cee8c50 | 335 | container_mem_unlock(c); |
72d0e1cb SG |
336 | return 0; |
337 | } | |
338 | ||
858377e4 | 339 | static bool do_lxcapi_is_defined(struct lxc_container *c) |
72d0e1cb SG |
340 | { |
341 | struct stat statbuf; | |
342 | bool ret = false; | |
343 | int statret; | |
344 | ||
345 | if (!c) | |
346 | return false; | |
347 | ||
5cee8c50 | 348 | if (container_mem_lock(c)) |
72d0e1cb SG |
349 | return false; |
350 | if (!c->configfile) | |
351 | goto out; | |
352 | statret = stat(c->configfile, &statbuf); | |
353 | if (statret != 0) | |
354 | goto out; | |
355 | ret = true; | |
356 | ||
357 | out: | |
5cee8c50 | 358 | container_mem_unlock(c); |
72d0e1cb SG |
359 | return ret; |
360 | } | |
361 | ||
858377e4 SH |
362 | #define WRAP_API(rettype, fnname) \ |
363 | static rettype fnname(struct lxc_container *c) \ | |
364 | { \ | |
365 | rettype ret; \ | |
8164f0e2 TA |
366 | bool reset_config = false; \ |
367 | \ | |
368 | if (!current_config && c && c->lxc_conf) { \ | |
369 | current_config = c->lxc_conf; \ | |
370 | reset_config = true; \ | |
371 | } \ | |
372 | \ | |
858377e4 | 373 | ret = do_##fnname(c); \ |
8164f0e2 TA |
374 | if (reset_config) \ |
375 | current_config = NULL; \ | |
376 | \ | |
858377e4 SH |
377 | return ret; \ |
378 | } | |
379 | ||
380 | #define WRAP_API_1(rettype, fnname, t1) \ | |
381 | static rettype fnname(struct lxc_container *c, t1 a1) \ | |
382 | { \ | |
383 | rettype ret; \ | |
8164f0e2 TA |
384 | bool reset_config = false; \ |
385 | \ | |
386 | if (!current_config && c && c->lxc_conf) { \ | |
387 | current_config = c->lxc_conf; \ | |
388 | reset_config = true; \ | |
389 | } \ | |
390 | \ | |
858377e4 | 391 | ret = do_##fnname(c, a1); \ |
8164f0e2 TA |
392 | if (reset_config) \ |
393 | current_config = NULL; \ | |
394 | \ | |
858377e4 SH |
395 | return ret; \ |
396 | } | |
397 | ||
398 | #define WRAP_API_2(rettype, fnname, t1, t2) \ | |
399 | static rettype fnname(struct lxc_container *c, t1 a1, t2 a2) \ | |
400 | { \ | |
401 | rettype ret; \ | |
8164f0e2 TA |
402 | bool reset_config = false; \ |
403 | \ | |
404 | if (!current_config && c && c->lxc_conf) { \ | |
405 | current_config = c->lxc_conf; \ | |
406 | reset_config = true; \ | |
407 | } \ | |
408 | \ | |
858377e4 | 409 | ret = do_##fnname(c, a1, a2); \ |
8164f0e2 TA |
410 | if (reset_config) \ |
411 | current_config = NULL; \ | |
412 | \ | |
858377e4 SH |
413 | return ret; \ |
414 | } | |
415 | ||
416 | #define WRAP_API_3(rettype, fnname, t1, t2, t3) \ | |
417 | static rettype fnname(struct lxc_container *c, t1 a1, t2 a2, t3 a3) \ | |
418 | { \ | |
419 | rettype ret; \ | |
8164f0e2 TA |
420 | bool reset_config = false; \ |
421 | \ | |
422 | if (!current_config && c && c->lxc_conf) { \ | |
423 | current_config = c->lxc_conf; \ | |
424 | reset_config = true; \ | |
425 | } \ | |
426 | \ | |
858377e4 | 427 | ret = do_##fnname(c, a1, a2, a3); \ |
8164f0e2 TA |
428 | if (reset_config) \ |
429 | current_config = NULL; \ | |
430 | \ | |
858377e4 SH |
431 | return ret; \ |
432 | } | |
433 | ||
434 | WRAP_API(bool, lxcapi_is_defined) | |
435 | ||
436 | static const char *do_lxcapi_state(struct lxc_container *c) | |
72d0e1cb | 437 | { |
72d0e1cb SG |
438 | lxc_state_t s; |
439 | ||
440 | if (!c) | |
441 | return NULL; | |
13f5be62 | 442 | s = lxc_getstate(c->name, c->config_path); |
39dc698c | 443 | return lxc_state2str(s); |
72d0e1cb SG |
444 | } |
445 | ||
858377e4 SH |
446 | WRAP_API(const char *, lxcapi_state) |
447 | ||
39dc698c | 448 | static bool is_stopped(struct lxc_container *c) |
794dd120 SH |
449 | { |
450 | lxc_state_t s; | |
13f5be62 | 451 | s = lxc_getstate(c->name, c->config_path); |
794dd120 SH |
452 | return (s == STOPPED); |
453 | } | |
454 | ||
858377e4 | 455 | static bool do_lxcapi_is_running(struct lxc_container *c) |
72d0e1cb SG |
456 | { |
457 | const char *s; | |
458 | ||
459 | if (!c) | |
460 | return false; | |
858377e4 | 461 | s = do_lxcapi_state(c); |
72d0e1cb SG |
462 | if (!s || strcmp(s, "STOPPED") == 0) |
463 | return false; | |
464 | return true; | |
465 | } | |
466 | ||
858377e4 SH |
467 | WRAP_API(bool, lxcapi_is_running) |
468 | ||
469 | static bool do_lxcapi_freeze(struct lxc_container *c) | |
72d0e1cb SG |
470 | { |
471 | int ret; | |
472 | if (!c) | |
473 | return false; | |
474 | ||
9123e471 | 475 | ret = lxc_freeze(c->name, c->config_path); |
72d0e1cb SG |
476 | if (ret) |
477 | return false; | |
478 | return true; | |
479 | } | |
480 | ||
858377e4 SH |
481 | WRAP_API(bool, lxcapi_freeze) |
482 | ||
483 | static bool do_lxcapi_unfreeze(struct lxc_container *c) | |
72d0e1cb SG |
484 | { |
485 | int ret; | |
486 | if (!c) | |
487 | return false; | |
488 | ||
9123e471 | 489 | ret = lxc_unfreeze(c->name, c->config_path); |
72d0e1cb SG |
490 | if (ret) |
491 | return false; | |
492 | return true; | |
493 | } | |
494 | ||
858377e4 SH |
495 | WRAP_API(bool, lxcapi_unfreeze) |
496 | ||
497 | static int do_lxcapi_console_getfd(struct lxc_container *c, int *ttynum, int *masterfd) | |
0115f8fd DE |
498 | { |
499 | int ttyfd; | |
500 | if (!c) | |
501 | return -1; | |
502 | ||
b5159817 | 503 | ttyfd = lxc_console_getfd(c, ttynum, masterfd); |
0115f8fd DE |
504 | return ttyfd; |
505 | } | |
506 | ||
858377e4 SH |
507 | WRAP_API_2(int, lxcapi_console_getfd, int *, int *) |
508 | ||
b5159817 DE |
509 | static int lxcapi_console(struct lxc_container *c, int ttynum, int stdinfd, |
510 | int stdoutfd, int stderrfd, int escape) | |
511 | { | |
858377e4 SH |
512 | int ret; |
513 | ||
514 | if (!c) | |
515 | return -1; | |
516 | ||
517 | current_config = c->lxc_conf; | |
518 | ret = lxc_console(c, ttynum, stdinfd, stdoutfd, stderrfd, escape); | |
519 | current_config = NULL; | |
520 | return ret; | |
b5159817 DE |
521 | } |
522 | ||
191d43cc CB |
523 | static int do_lxcapi_console_log(struct lxc_container *c, struct lxc_console_log *log) |
524 | { | |
525 | int ret; | |
526 | ||
527 | ret = lxc_cmd_console_log(c->name, do_lxcapi_get_config_path(c), log); | |
528 | if (ret < 0) { | |
529 | if (ret == -ENODATA) | |
63b74cda | 530 | NOTICE("The console log is empty"); |
191d43cc | 531 | else if (ret == -EFAULT) |
63b74cda CB |
532 | NOTICE("The container does not keep a console log"); |
533 | else if (ret == -ENOENT) | |
534 | NOTICE("The container does not keep a console log file"); | |
535 | else if (ret == -EIO) | |
536 | NOTICE("Failed to write console log to log file"); | |
191d43cc | 537 | else |
63b74cda | 538 | ERROR("Failed to retrieve console log"); |
191d43cc CB |
539 | } |
540 | ||
541 | return ret; | |
542 | } | |
543 | ||
544 | WRAP_API_1(int, lxcapi_console_log, struct lxc_console_log *) | |
545 | ||
858377e4 | 546 | static pid_t do_lxcapi_init_pid(struct lxc_container *c) |
72d0e1cb | 547 | { |
72d0e1cb SG |
548 | if (!c) |
549 | return -1; | |
550 | ||
5cee8c50 | 551 | return lxc_cmd_get_init_pid(c->name, c->config_path); |
72d0e1cb SG |
552 | } |
553 | ||
858377e4 SH |
554 | WRAP_API(pid_t, lxcapi_init_pid) |
555 | ||
12a50cc6 | 556 | static bool load_config_locked(struct lxc_container *c, const char *fname) |
8eb5694b SH |
557 | { |
558 | if (!c->lxc_conf) | |
559 | c->lxc_conf = lxc_conf_init(); | |
6b0d5538 SH |
560 | if (!c->lxc_conf) |
561 | return false; | |
d08779d4 SH |
562 | if (lxc_config_read(fname, c->lxc_conf, false) != 0) |
563 | return false; | |
d08779d4 | 564 | return true; |
8eb5694b SH |
565 | } |
566 | ||
858377e4 | 567 | static bool do_lxcapi_load_config(struct lxc_container *c, const char *alt_file) |
72d0e1cb | 568 | { |
39dc698c SH |
569 | bool ret = false, need_disklock = false; |
570 | int lret; | |
12a50cc6 | 571 | const char *fname; |
72d0e1cb SG |
572 | if (!c) |
573 | return false; | |
574 | ||
575 | fname = c->configfile; | |
576 | if (alt_file) | |
577 | fname = alt_file; | |
578 | if (!fname) | |
579 | return false; | |
39dc698c SH |
580 | /* |
581 | * If we're reading something other than the container's config, | |
582 | * we only need to lock the in-memory container. If loading the | |
583 | * container's config file, take the disk lock. | |
584 | */ | |
585 | if (strcmp(fname, c->configfile) == 0) | |
586 | need_disklock = true; | |
587 | ||
588 | if (need_disklock) | |
589 | lret = container_disk_lock(c); | |
590 | else | |
591 | lret = container_mem_lock(c); | |
592 | if (lret) | |
72d0e1cb | 593 | return false; |
39dc698c | 594 | |
8eb5694b | 595 | ret = load_config_locked(c, fname); |
39dc698c SH |
596 | |
597 | if (need_disklock) | |
598 | container_disk_unlock(c); | |
599 | else | |
600 | container_mem_unlock(c); | |
72d0e1cb SG |
601 | return ret; |
602 | } | |
603 | ||
858377e4 SH |
604 | WRAP_API_1(bool, lxcapi_load_config, const char *) |
605 | ||
606 | static bool do_lxcapi_want_daemonize(struct lxc_container *c, bool state) | |
72d0e1cb | 607 | { |
497a2995 | 608 | if (!c || !c->lxc_conf) |
540f932a | 609 | return false; |
f02abefe | 610 | if (container_mem_lock(c)) { |
3bc449ed | 611 | ERROR("Error getting mem lock"); |
540f932a | 612 | return false; |
3bc449ed | 613 | } |
a2739df5 | 614 | c->daemonize = state; |
3bc449ed | 615 | container_mem_unlock(c); |
540f932a | 616 | return true; |
72d0e1cb SG |
617 | } |
618 | ||
858377e4 SH |
619 | WRAP_API_1(bool, lxcapi_want_daemonize, bool) |
620 | ||
621 | static bool do_lxcapi_want_close_all_fds(struct lxc_container *c, bool state) | |
130a1888 ÇO |
622 | { |
623 | if (!c || !c->lxc_conf) | |
49badbbe | 624 | return false; |
130a1888 ÇO |
625 | if (container_mem_lock(c)) { |
626 | ERROR("Error getting mem lock"); | |
49badbbe | 627 | return false; |
130a1888 | 628 | } |
540f932a | 629 | c->lxc_conf->close_all_fds = state; |
130a1888 | 630 | container_mem_unlock(c); |
49badbbe | 631 | return true; |
130a1888 ÇO |
632 | } |
633 | ||
858377e4 SH |
634 | WRAP_API_1(bool, lxcapi_want_close_all_fds, bool) |
635 | ||
636 | static bool do_lxcapi_wait(struct lxc_container *c, const char *state, int timeout) | |
7a44c8b4 SG |
637 | { |
638 | int ret; | |
639 | ||
640 | if (!c) | |
641 | return false; | |
642 | ||
67e571de | 643 | ret = lxc_wait(c->name, state, timeout, c->config_path); |
7a44c8b4 SG |
644 | return ret == 0; |
645 | } | |
646 | ||
858377e4 | 647 | WRAP_API_2(bool, lxcapi_wait, const char *, int) |
7a44c8b4 | 648 | |
2d834aa8 SH |
649 | static bool am_single_threaded(void) |
650 | { | |
74f96976 | 651 | struct dirent *direntp; |
2d834aa8 SH |
652 | DIR *dir; |
653 | int count=0; | |
654 | ||
2d834aa8 | 655 | dir = opendir("/proc/self/task"); |
2d834aa8 SH |
656 | if (!dir) { |
657 | INFO("failed to open /proc/self/task"); | |
658 | return false; | |
659 | } | |
660 | ||
74f96976 | 661 | while ((direntp = readdir(dir))) { |
2d834aa8 SH |
662 | if (!strcmp(direntp->d_name, ".")) |
663 | continue; | |
664 | ||
665 | if (!strcmp(direntp->d_name, "..")) | |
666 | continue; | |
667 | if (++count > 1) | |
668 | break; | |
669 | } | |
2d834aa8 | 670 | closedir(dir); |
2d834aa8 SH |
671 | return count == 1; |
672 | } | |
673 | ||
fd51a89b SH |
674 | static void push_arg(char ***argp, char *arg, int *nargs) |
675 | { | |
676 | char **argv; | |
677 | char *copy; | |
678 | ||
679 | do { | |
680 | copy = strdup(arg); | |
681 | } while (!copy); | |
682 | do { | |
683 | argv = realloc(*argp, (*nargs + 2) * sizeof(char *)); | |
684 | } while (!argv); | |
685 | *argp = argv; | |
686 | argv[*nargs] = copy; | |
687 | (*nargs)++; | |
688 | argv[*nargs] = NULL; | |
689 | } | |
690 | ||
691 | static char **split_init_cmd(const char *incmd) | |
692 | { | |
693 | size_t len; | |
694 | int nargs = 0; | |
5590a671 | 695 | char *copy, *p, *saveptr = NULL; |
fd51a89b SH |
696 | char **argv; |
697 | ||
698 | if (!incmd) | |
699 | return NULL; | |
700 | ||
701 | len = strlen(incmd) + 1; | |
702 | copy = alloca(len); | |
703 | strncpy(copy, incmd, len); | |
704 | copy[len-1] = '\0'; | |
705 | ||
706 | do { | |
707 | argv = malloc(sizeof(char *)); | |
708 | } while (!argv); | |
709 | argv[0] = NULL; | |
710 | for (p = strtok_r(copy, " ", &saveptr); p != NULL; | |
711 | p = strtok_r(NULL, " ", &saveptr)) | |
712 | push_arg(&argv, p, &nargs); | |
713 | ||
714 | if (nargs == 0) { | |
715 | free(argv); | |
716 | return NULL; | |
717 | } | |
718 | return argv; | |
719 | } | |
720 | ||
721 | static void free_init_cmd(char **argv) | |
722 | { | |
723 | int i = 0; | |
724 | ||
725 | if (!argv) | |
726 | return; | |
727 | while (argv[i]) | |
728 | free(argv[i++]); | |
729 | free(argv); | |
730 | } | |
731 | ||
5e5576a4 CB |
732 | static int lxc_rcv_status(int state_socket) |
733 | { | |
734 | int ret; | |
ee8377bd | 735 | int state = -1; |
5e5576a4 | 736 | |
ee8377bd | 737 | again: |
5e5576a4 CB |
738 | /* Receive container state. */ |
739 | ret = lxc_abstract_unix_rcv_credential(state_socket, &state, | |
ee8377bd CB |
740 | sizeof(int)); |
741 | if (ret <= 0) { | |
742 | if (errno != EINTR) | |
743 | return -1; | |
744 | TRACE("Caught EINTR; retrying"); | |
745 | goto again; | |
746 | } | |
5e5576a4 CB |
747 | |
748 | return state; | |
749 | } | |
750 | ||
751 | static bool wait_on_daemonized_start(struct lxc_handler *handler, int pid) | |
752 | { | |
01c1b11e | 753 | int ret, state; |
5e5576a4 CB |
754 | |
755 | /* Close write end of the socket pair. */ | |
756 | close(handler->state_socket_pair[1]); | |
757 | handler->state_socket_pair[1] = -1; | |
758 | ||
759 | state = lxc_rcv_status(handler->state_socket_pair[0]); | |
760 | ||
761 | /* Close read end of the socket pair. */ | |
762 | close(handler->state_socket_pair[0]); | |
763 | handler->state_socket_pair[0] = -1; | |
764 | ||
765 | /* The first child is going to fork() again and then exits. So we reap | |
766 | * the first child here. | |
767 | */ | |
01c1b11e CB |
768 | ret = wait_for_pid(pid); |
769 | if (ret < 0) | |
770 | DEBUG("Failed waiting on first child %d", pid); | |
771 | else | |
772 | DEBUG("First child %d exited", pid); | |
5e5576a4 CB |
773 | |
774 | if (state < 0) { | |
775 | SYSERROR("Failed to receive the container state"); | |
776 | return false; | |
777 | } | |
778 | ||
779 | /* If we receive anything else then running we know that the container | |
780 | * failed to start. | |
781 | */ | |
782 | if (state != RUNNING) { | |
783 | ERROR("Received container state \"%s\" instead of \"RUNNING\"", | |
784 | lxc_state2str(state)); | |
785 | return false; | |
786 | } | |
787 | ||
788 | TRACE("Container is in \"RUNNING\" state"); | |
789 | return true; | |
790 | } | |
791 | ||
858377e4 | 792 | static bool do_lxcapi_start(struct lxc_container *c, int useinit, char * const argv[]) |
72d0e1cb SG |
793 | { |
794 | int ret; | |
aa460476 | 795 | struct lxc_handler *handler; |
72d0e1cb | 796 | struct lxc_conf *conf; |
540f932a | 797 | bool daemonize = false; |
6eaac303 | 798 | FILE *pid_fp = NULL; |
72d0e1cb SG |
799 | char *default_args[] = { |
800 | "/sbin/init", | |
13aad0ae | 801 | NULL, |
72d0e1cb | 802 | }; |
fd51a89b | 803 | char **init_cmd = NULL; |
c1a3e547 | 804 | int keepfds[3] = {-1, -1, -1}; |
72d0e1cb | 805 | |
7cb19d44 | 806 | /* container does exist */ |
72d0e1cb SG |
807 | if (!c) |
808 | return false; | |
120146b9 | 809 | |
7cb19d44 CB |
810 | /* If anything fails before we set error_num, we want an error in there. |
811 | */ | |
120146b9 SG |
812 | c->error_num = 1; |
813 | ||
7cb19d44 | 814 | /* Container has not been setup. */ |
72d0e1cb SG |
815 | if (!c->lxc_conf) |
816 | return false; | |
817 | ||
c47eafec CB |
818 | ret = ongoing_create(c); |
819 | if (ret < 0) { | |
7cb19d44 | 820 | ERROR("Failed checking for incomplete container creation"); |
3e625e2d | 821 | return false; |
3e625e2d | 822 | } else if (ret == 1) { |
7cb19d44 | 823 | ERROR("Ongoing container creation detected"); |
3e625e2d | 824 | return false; |
c47eafec | 825 | } else if (ret == 2) { |
7cb19d44 | 826 | ERROR("Failed to create container"); |
c47eafec CB |
827 | do_lxcapi_destroy(c); |
828 | return false; | |
3e625e2d SH |
829 | } |
830 | ||
5cee8c50 | 831 | if (container_mem_lock(c)) |
72d0e1cb SG |
832 | return false; |
833 | conf = c->lxc_conf; | |
834 | daemonize = c->daemonize; | |
72d0e1cb | 835 | |
aa460476 | 836 | /* initialize handler */ |
5e5576a4 | 837 | handler = lxc_init_handler(c->name, conf, c->config_path, daemonize); |
dbc9832d | 838 | container_mem_unlock(c); |
aa460476 CB |
839 | if (!handler) |
840 | return false; | |
841 | ||
fa30091b CB |
842 | if (!argv) { |
843 | if (useinit && conf->execute_cmd) | |
844 | argv = init_cmd = split_init_cmd(conf->execute_cmd); | |
845 | else | |
846 | argv = init_cmd = split_init_cmd(conf->init_cmd); | |
847 | } | |
fd51a89b | 848 | |
7cb19d44 | 849 | /* ... otherwise use default_args. */ |
fa30091b | 850 | if (!argv) { |
e1e76423 CB |
851 | if (useinit) { |
852 | ERROR("No valid init detected"); | |
853 | lxc_free_handler(handler); | |
fa30091b | 854 | return false; |
e1e76423 CB |
855 | } |
856 | argv = default_args; | |
fa30091b | 857 | } |
72d0e1cb | 858 | |
7cb19d44 CB |
859 | /* I'm not sure what locks we want here.Any? Is liblxc's locking enough |
860 | * here to protect the on disk container? We don't want to exclude | |
861 | * things like lxc_info while the container is running. | |
862 | */ | |
72d0e1cb | 863 | if (daemonize) { |
a6b6ad7b | 864 | bool started; |
0a4be28d | 865 | char title[2048]; |
c47eafec | 866 | pid_t pid; |
71454076 | 867 | |
c47eafec | 868 | pid = fork(); |
f2e07cb6 | 869 | if (pid < 0) { |
c47eafec | 870 | free_init_cmd(init_cmd); |
f2e07cb6 | 871 | lxc_free_handler(handler); |
72d0e1cb | 872 | return false; |
f2e07cb6 | 873 | } |
6eaac303 | 874 | |
7cb19d44 | 875 | /* first parent */ |
6eaac303 QH |
876 | if (pid != 0) { |
877 | /* Set to NULL because we don't want father unlink | |
878 | * the PID file, child will do the free and unlink. | |
879 | */ | |
880 | c->pidfile = NULL; | |
5e5576a4 | 881 | |
7cb19d44 CB |
882 | /* Wait for container to tell us whether it started |
883 | * successfully. | |
884 | */ | |
a6b6ad7b CB |
885 | started = wait_on_daemonized_start(handler, pid); |
886 | ||
887 | free_init_cmd(init_cmd); | |
888 | lxc_free_handler(handler); | |
889 | return started; | |
6eaac303 | 890 | } |
025ed0f3 | 891 | |
7cb19d44 CB |
892 | /* first child */ |
893 | ||
0a4be28d | 894 | /* We don't really care if this doesn't print all the |
7cb19d44 CB |
895 | * characters. All that it means is that the proctitle will be |
896 | * ugly. Similarly, we also don't care if setproctitle() fails. | |
897 | * */ | |
0a4be28d TA |
898 | snprintf(title, sizeof(title), "[lxc monitor] %s %s", c->config_path, c->name); |
899 | INFO("Attempting to set proc title to %s", title); | |
900 | setproctitle(title); | |
901 | ||
7cb19d44 CB |
902 | /* We fork() a second time to be reparented to init. Like |
903 | * POSIX's daemon() function we change to "/" and redirect | |
904 | * std{in,out,err} to /dev/null. | |
905 | */ | |
697fa639 SH |
906 | pid = fork(); |
907 | if (pid < 0) { | |
7cb19d44 | 908 | SYSERROR("Failed to fork first child process"); |
d608fbda | 909 | _exit(EXIT_FAILURE); |
697fa639 | 910 | } |
a6b6ad7b | 911 | |
7cb19d44 | 912 | /* second parent */ |
a6b6ad7b CB |
913 | if (pid != 0) { |
914 | free_init_cmd(init_cmd); | |
915 | lxc_free_handler(handler); | |
d608fbda | 916 | _exit(EXIT_SUCCESS); |
a6b6ad7b CB |
917 | } |
918 | ||
7cb19d44 CB |
919 | /* second child */ |
920 | ||
921 | /* change to / directory */ | |
922 | ret = chdir("/"); | |
923 | if (ret < 0) { | |
924 | SYSERROR("Failed to change to \"/\" directory"); | |
d608fbda | 925 | _exit(EXIT_FAILURE); |
c278cef2 | 926 | } |
7cb19d44 | 927 | |
c1a3e547 CB |
928 | keepfds[0] = handler->conf->maincmd_fd; |
929 | keepfds[1] = handler->state_socket_pair[0]; | |
930 | keepfds[2] = handler->state_socket_pair[1]; | |
931 | ret = lxc_check_inherited(conf, true, keepfds, | |
932 | sizeof(keepfds) / sizeof(keepfds[0])); | |
7cb19d44 | 933 | if (ret < 0) |
d608fbda | 934 | _exit(EXIT_FAILURE); |
7cb19d44 CB |
935 | |
936 | /* redirect std{in,out,err} to /dev/null */ | |
937 | ret = null_stdfds(); | |
938 | if (ret < 0) { | |
939 | ERROR("Failed to redirect std{in,out,err} to /dev/null"); | |
d608fbda | 940 | _exit(EXIT_FAILURE); |
69aeabac | 941 | } |
7cb19d44 CB |
942 | |
943 | /* become session leader */ | |
944 | ret = setsid(); | |
945 | if (ret < 0) | |
0059379f | 946 | TRACE("Process %d is already process group leader", lxc_raw_getpid()); |
2d834aa8 SH |
947 | } else { |
948 | if (!am_single_threaded()) { | |
949 | ERROR("Cannot start non-daemonized container when threaded"); | |
a6b6ad7b | 950 | free_init_cmd(init_cmd); |
f2e07cb6 | 951 | lxc_free_handler(handler); |
2d834aa8 SH |
952 | return false; |
953 | } | |
72d0e1cb SG |
954 | } |
955 | ||
aa460476 | 956 | /* We need to write PID file after daemonize, so we always |
6eaac303 QH |
957 | * write the right PID. |
958 | */ | |
959 | if (c->pidfile) { | |
960 | pid_fp = fopen(c->pidfile, "w"); | |
961 | if (pid_fp == NULL) { | |
962 | SYSERROR("Failed to create pidfile '%s' for '%s'", | |
963 | c->pidfile, c->name); | |
c47eafec | 964 | free_init_cmd(init_cmd); |
f2e07cb6 | 965 | lxc_free_handler(handler); |
13353dc4 | 966 | if (daemonize) |
d608fbda | 967 | _exit(EXIT_FAILURE); |
6eaac303 QH |
968 | return false; |
969 | } | |
970 | ||
0059379f | 971 | if (fprintf(pid_fp, "%d\n", lxc_raw_getpid()) < 0) { |
6eaac303 QH |
972 | SYSERROR("Failed to write '%s'", c->pidfile); |
973 | fclose(pid_fp); | |
974 | pid_fp = NULL; | |
c47eafec | 975 | free_init_cmd(init_cmd); |
f2e07cb6 | 976 | lxc_free_handler(handler); |
13353dc4 | 977 | if (daemonize) |
d608fbda | 978 | _exit(EXIT_FAILURE); |
6eaac303 QH |
979 | return false; |
980 | } | |
981 | ||
982 | fclose(pid_fp); | |
983 | pid_fp = NULL; | |
984 | } | |
985 | ||
72d0e1cb | 986 | conf->reboot = 0; |
d2cf4c37 | 987 | |
a8dfe4e0 WB |
988 | /* Unshare the mount namespace if requested */ |
989 | if (conf->monitor_unshare) { | |
7cb19d44 CB |
990 | ret = unshare(CLONE_NEWNS); |
991 | if (ret < 0) { | |
a8dfe4e0 | 992 | SYSERROR("failed to unshare mount namespace"); |
f2e07cb6 | 993 | lxc_free_handler(handler); |
a6b6ad7b | 994 | ret = 1; |
7cb19d44 | 995 | goto on_error; |
a8dfe4e0 | 996 | } |
7cb19d44 CB |
997 | |
998 | ret = mount(NULL, "/", NULL, MS_SLAVE|MS_REC, NULL); | |
999 | if (ret < 0) { | |
a8dfe4e0 | 1000 | SYSERROR("Failed to make / rslave at startup"); |
f2e07cb6 | 1001 | lxc_free_handler(handler); |
a6b6ad7b | 1002 | ret = 1; |
7cb19d44 | 1003 | goto on_error; |
a8dfe4e0 WB |
1004 | } |
1005 | } | |
1006 | ||
8bee8851 | 1007 | reboot: |
aa460476 CB |
1008 | if (conf->reboot == 2) { |
1009 | /* initialize handler */ | |
5e5576a4 | 1010 | handler = lxc_init_handler(c->name, conf, c->config_path, daemonize); |
a6b6ad7b CB |
1011 | if (!handler) { |
1012 | ret = 1; | |
7cb19d44 | 1013 | goto on_error; |
a6b6ad7b | 1014 | } |
aa460476 CB |
1015 | } |
1016 | ||
c1a3e547 CB |
1017 | keepfds[0] = handler->conf->maincmd_fd; |
1018 | keepfds[1] = handler->state_socket_pair[0]; | |
1019 | keepfds[2] = handler->state_socket_pair[1]; | |
1020 | ret = lxc_check_inherited(conf, daemonize, keepfds, | |
1021 | sizeof(keepfds) / sizeof(keepfds[0])); | |
7cb19d44 | 1022 | if (ret < 0) { |
f2e07cb6 | 1023 | lxc_free_handler(handler); |
d2cf4c37 | 1024 | ret = 1; |
7cb19d44 | 1025 | goto on_error; |
d2cf4c37 SH |
1026 | } |
1027 | ||
9605460f CB |
1028 | if (useinit) |
1029 | ret = lxc_execute(c->name, argv, 1, handler, c->config_path, daemonize); | |
1030 | else | |
1031 | ret = lxc_start(c->name, argv, handler, c->config_path, daemonize); | |
cd5177e9 | 1032 | c->error_num = handler->exit_status; |
72d0e1cb | 1033 | |
8bee8851 | 1034 | if (conf->reboot == 1) { |
7cb19d44 | 1035 | INFO("Container requested reboot"); |
8bee8851 | 1036 | conf->reboot = 2; |
72d0e1cb SG |
1037 | goto reboot; |
1038 | } | |
1039 | ||
7cb19d44 | 1040 | on_error: |
487d8008 QH |
1041 | if (c->pidfile) { |
1042 | unlink(c->pidfile); | |
1043 | free(c->pidfile); | |
1044 | c->pidfile = NULL; | |
1045 | } | |
fd51a89b SH |
1046 | free_init_cmd(init_cmd); |
1047 | ||
7cb19d44 | 1048 | if (daemonize && ret != 0) |
d608fbda | 1049 | _exit(EXIT_FAILURE); |
7cb19d44 | 1050 | else if (daemonize) |
d608fbda | 1051 | _exit(EXIT_SUCCESS); |
7cb19d44 CB |
1052 | |
1053 | if (ret != 0) | |
1054 | return false; | |
1055 | ||
1056 | return true; | |
72d0e1cb SG |
1057 | } |
1058 | ||
858377e4 SH |
1059 | static bool lxcapi_start(struct lxc_container *c, int useinit, char * const argv[]) |
1060 | { | |
1061 | bool ret; | |
1062 | current_config = c ? c->lxc_conf : NULL; | |
1063 | ret = do_lxcapi_start(c, useinit, argv); | |
1064 | current_config = NULL; | |
1065 | return ret; | |
1066 | } | |
1067 | ||
72d0e1cb SG |
1068 | /* |
1069 | * note there MUST be an ending NULL | |
1070 | */ | |
1071 | static bool lxcapi_startl(struct lxc_container *c, int useinit, ...) | |
1072 | { | |
1073 | va_list ap; | |
a0e93eeb | 1074 | char **inargs = NULL; |
72d0e1cb SG |
1075 | bool bret = false; |
1076 | ||
1077 | /* container exists */ | |
1078 | if (!c) | |
1079 | return false; | |
1080 | ||
858377e4 SH |
1081 | current_config = c->lxc_conf; |
1082 | ||
72d0e1cb | 1083 | va_start(ap, useinit); |
a0e93eeb | 1084 | inargs = lxc_va_arg_list_to_argv(ap, 0, 1); |
72d0e1cb SG |
1085 | va_end(ap); |
1086 | ||
a0e93eeb CS |
1087 | if (!inargs) { |
1088 | ERROR("Memory allocation error."); | |
1089 | goto out; | |
72d0e1cb SG |
1090 | } |
1091 | ||
a0e93eeb | 1092 | /* pass NULL if no arguments were supplied */ |
858377e4 | 1093 | bret = do_lxcapi_start(c, useinit, *inargs ? inargs : NULL); |
72d0e1cb SG |
1094 | |
1095 | out: | |
1096 | if (inargs) { | |
4e03ae57 DE |
1097 | char **arg; |
1098 | for (arg = inargs; *arg; arg++) | |
1099 | free(*arg); | |
72d0e1cb SG |
1100 | free(inargs); |
1101 | } | |
1102 | ||
858377e4 | 1103 | current_config = NULL; |
72d0e1cb SG |
1104 | return bret; |
1105 | } | |
1106 | ||
858377e4 | 1107 | static bool do_lxcapi_stop(struct lxc_container *c) |
72d0e1cb SG |
1108 | { |
1109 | int ret; | |
1110 | ||
1111 | if (!c) | |
1112 | return false; | |
1113 | ||
ef6e34ee | 1114 | ret = lxc_cmd_stop(c->name, c->config_path); |
72d0e1cb | 1115 | |
d775f21b | 1116 | return ret == 0; |
72d0e1cb SG |
1117 | } |
1118 | ||
858377e4 SH |
1119 | WRAP_API(bool, lxcapi_stop) |
1120 | ||
d5752559 SH |
1121 | static int do_create_container_dir(const char *path, struct lxc_conf *conf) |
1122 | { | |
1123 | int ret = -1, lasterr; | |
1124 | char *p = alloca(strlen(path)+1); | |
1125 | mode_t mask = umask(0002); | |
1126 | ret = mkdir(path, 0770); | |
1127 | lasterr = errno; | |
1128 | umask(mask); | |
1129 | errno = lasterr; | |
1130 | if (ret) { | |
1131 | if (errno == EEXIST) | |
1132 | ret = 0; | |
1133 | else { | |
1134 | SYSERROR("failed to create container path %s", path); | |
1135 | return -1; | |
1136 | } | |
1137 | } | |
1138 | strcpy(p, path); | |
1139 | if (!lxc_list_empty(&conf->id_map) && chown_mapped_root(p, conf) != 0) { | |
1140 | ERROR("Failed to chown container dir"); | |
1141 | ret = -1; | |
1142 | } | |
1143 | return ret; | |
1144 | } | |
1145 | ||
72d0e1cb SG |
1146 | /* |
1147 | * create the standard expected container dir | |
1148 | */ | |
1149 | static bool create_container_dir(struct lxc_container *c) | |
1150 | { | |
1151 | char *s; | |
1152 | int len, ret; | |
1153 | ||
2a59a681 | 1154 | len = strlen(c->config_path) + strlen(c->name) + 2; |
72d0e1cb SG |
1155 | s = malloc(len); |
1156 | if (!s) | |
1157 | return false; | |
2a59a681 | 1158 | ret = snprintf(s, len, "%s/%s", c->config_path, c->name); |
72d0e1cb SG |
1159 | if (ret < 0 || ret >= len) { |
1160 | free(s); | |
1161 | return false; | |
1162 | } | |
d5752559 | 1163 | ret = do_create_container_dir(s, c->lxc_conf); |
72d0e1cb SG |
1164 | free(s); |
1165 | return ret == 0; | |
1166 | } | |
1167 | ||
10bc1861 CB |
1168 | /* do_storage_create: thin wrapper around storage_create(). Like |
1169 | * storage_create(), it returns a mounted bdev on success, NULL on error. | |
72d0e1cb | 1170 | */ |
10bc1861 CB |
1171 | static struct lxc_storage *do_storage_create(struct lxc_container *c, |
1172 | const char *type, | |
1173 | struct bdev_specs *specs) | |
1897e3bc | 1174 | { |
e9e29a33 | 1175 | int ret; |
1897e3bc | 1176 | size_t len; |
e9e29a33 | 1177 | char *dest; |
10bc1861 | 1178 | struct lxc_storage *bdev; |
1897e3bc | 1179 | |
cd219ae6 | 1180 | /* rootfs.path or lxcpath/lxcname/rootfs */ |
e9e29a33 CB |
1181 | if (c->lxc_conf->rootfs.path && |
1182 | (access(c->lxc_conf->rootfs.path, F_OK) == 0)) { | |
cf465fe4 SH |
1183 | const char *rpath = c->lxc_conf->rootfs.path; |
1184 | len = strlen(rpath) + 1; | |
cd219ae6 | 1185 | dest = alloca(len); |
cf465fe4 | 1186 | ret = snprintf(dest, len, "%s", rpath); |
cd219ae6 | 1187 | } else { |
858377e4 | 1188 | const char *lxcpath = do_lxcapi_get_config_path(c); |
cd219ae6 SY |
1189 | len = strlen(c->name) + strlen(lxcpath) + 9; |
1190 | dest = alloca(len); | |
1191 | ret = snprintf(dest, len, "%s/%s/rootfs", lxcpath, c->name); | |
1192 | } | |
e9e29a33 | 1193 | if (ret < 0 || (size_t)ret >= len) |
1897e3bc SH |
1194 | return NULL; |
1195 | ||
10bc1861 | 1196 | bdev = storage_create(dest, type, c->name, specs); |
d44e88c2 | 1197 | if (!bdev) { |
e9e29a33 | 1198 | ERROR("Failed to create \"%s\" storage", type); |
1897e3bc | 1199 | return NULL; |
d44e88c2 SH |
1200 | } |
1201 | ||
7a96a068 | 1202 | if (!c->set_config_item(c, "lxc.rootfs.path", bdev->src)) { |
e9e29a33 | 1203 | ERROR("Failed to set \"lxc.rootfs.path = %s\"", bdev->src); |
f7ac4459 CB |
1204 | return NULL; |
1205 | } | |
cf3ef16d | 1206 | |
e9e29a33 CB |
1207 | /* If we are not root, chown the rootfs dir to root in the target user |
1208 | * namespace. | |
f7ac4459 | 1209 | */ |
e9e29a33 CB |
1210 | ret = geteuid(); |
1211 | if (ret != 0 || (c->lxc_conf && !lxc_list_empty(&c->lxc_conf->id_map))) { | |
1212 | ret = chown_mapped_root(bdev->dest, c->lxc_conf); | |
1213 | if (ret < 0) { | |
1214 | ERROR("Error chowning \"%s\" to container root", bdev->dest); | |
97e9cfa0 | 1215 | suggest_default_idmap(); |
10bc1861 | 1216 | storage_put(bdev); |
cf3ef16d SH |
1217 | return NULL; |
1218 | } | |
1219 | } | |
1220 | ||
1897e3bc SH |
1221 | return bdev; |
1222 | } | |
1223 | ||
96b3cb40 | 1224 | static char *lxcbasename(char *path) |
72d0e1cb | 1225 | { |
47e55887 CB |
1226 | char *p; |
1227 | ||
1228 | p = path + strlen(path) - 1; | |
96b3cb40 SH |
1229 | while (*p != '/' && p > path) |
1230 | p--; | |
47e55887 | 1231 | |
96b3cb40 SH |
1232 | return p; |
1233 | } | |
72d0e1cb | 1234 | |
47e55887 CB |
1235 | static bool create_run_template(struct lxc_container *c, char *tpath, |
1236 | bool need_null_stdfds, char *const argv[]) | |
96b3cb40 | 1237 | { |
47e55887 | 1238 | int ret; |
96b3cb40 | 1239 | pid_t pid; |
72d0e1cb | 1240 | |
72d0e1cb | 1241 | if (!tpath) |
96b3cb40 | 1242 | return true; |
72d0e1cb SG |
1243 | |
1244 | pid = fork(); | |
1245 | if (pid < 0) { | |
7e34710e | 1246 | SYSERROR("Failed to fork task for container creation template"); |
96b3cb40 | 1247 | return false; |
72d0e1cb SG |
1248 | } |
1249 | ||
1a0e70ac | 1250 | if (pid == 0) { /* child */ |
47e55887 CB |
1251 | int i, len; |
1252 | char *namearg, *patharg, *rootfsarg; | |
96b3cb40 | 1253 | char **newargv; |
47e55887 CB |
1254 | int nargs = 0; |
1255 | struct lxc_storage *bdev = NULL; | |
cf3ef16d | 1256 | struct lxc_conf *conf = c->lxc_conf; |
47e55887 | 1257 | uid_t euid; |
72d0e1cb | 1258 | |
47e55887 CB |
1259 | if (need_null_stdfds) { |
1260 | ret = null_stdfds(); | |
1261 | if (ret < 0) | |
1262 | _exit(EXIT_FAILURE); | |
dc23c1c8 | 1263 | } |
1897e3bc | 1264 | |
8a388ed4 | 1265 | bdev = storage_init(c->lxc_conf); |
1897e3bc | 1266 | if (!bdev) { |
47e55887 | 1267 | ERROR("Failed to initialize storage"); |
7e34710e | 1268 | _exit(EXIT_FAILURE); |
1897e3bc SH |
1269 | } |
1270 | ||
47e55887 CB |
1271 | euid = geteuid(); |
1272 | if (euid == 0) { | |
1273 | ret = unshare(CLONE_NEWNS); | |
1274 | if (ret < 0) { | |
1275 | ERROR("Failed to unshare CLONE_NEWNS"); | |
7e34710e | 1276 | _exit(EXIT_FAILURE); |
cf3ef16d | 1277 | } |
47e55887 CB |
1278 | |
1279 | ret = detect_shared_rootfs(); | |
1280 | if (ret == 1) { | |
1281 | ret = mount(NULL, "/", NULL, MS_SLAVE | MS_REC, NULL); | |
1282 | if (ret < 0) { | |
1283 | SYSERROR("Failed to make \"/\" rslave"); | |
4de2791f SH |
1284 | ERROR("Continuing..."); |
1285 | } | |
1286 | } | |
1287 | } | |
47e55887 CB |
1288 | |
1289 | if (strcmp(bdev->type, "dir") != 0 && strcmp(bdev->type, "btrfs") != 0) { | |
1290 | if (euid != 0) { | |
1291 | ERROR("Unprivileged users can only create " | |
1292 | "btrfs and directory-backed containers"); | |
eb70aaf0 | 1293 | _exit(EXIT_FAILURE); |
4de2791f | 1294 | } |
241978fa | 1295 | |
47e55887 CB |
1296 | if (strcmp(bdev->type, "overlay") == 0 || |
1297 | strcmp(bdev->type, "overlayfs") == 0) { | |
241978fa CB |
1298 | /* If we create an overlay container we need to |
1299 | * rsync the contents into | |
1300 | * <container-path>/<container-name>/rootfs. | |
1301 | * However, the overlay mount function will | |
1302 | * mount will mount | |
1303 | * <container-path>/<container-name>/delta0 | |
1304 | * over | |
1305 | * <container-path>/<container-name>/rootfs | |
1306 | * which means we would rsync the rootfs into | |
1307 | * the delta directory. That doesn't make sense | |
1308 | * since the delta directory only exists to | |
1309 | * record the differences to | |
1310 | * <container-path>/<container-name>/rootfs. So | |
1311 | * let's simply bind-mount here and then rsync | |
1312 | * directly into | |
1313 | * <container-path>/<container-name>/rootfs. | |
1314 | */ | |
1315 | char *src; | |
1316 | ||
1317 | src = ovl_get_rootfs(bdev->src, &(size_t){0}); | |
1318 | if (!src) { | |
1319 | ERROR("Failed to get rootfs"); | |
eb70aaf0 | 1320 | _exit(EXIT_FAILURE); |
241978fa CB |
1321 | } |
1322 | ||
1323 | ret = mount(src, bdev->dest, "bind", MS_BIND | MS_REC, NULL); | |
1324 | if (ret < 0) { | |
1325 | ERROR("Failed to mount rootfs"); | |
1326 | return -1; | |
1327 | } | |
1328 | } else { | |
47e55887 CB |
1329 | ret = bdev->ops->mount(bdev); |
1330 | if (ret < 0) { | |
241978fa | 1331 | ERROR("Failed to mount rootfs"); |
eb70aaf0 | 1332 | _exit(EXIT_FAILURE); |
241978fa | 1333 | } |
cf3ef16d | 1334 | } |
1a0e70ac | 1335 | } else { /* TODO come up with a better way here! */ |
41dc7155 | 1336 | const char *src; |
f10fad2f | 1337 | free(bdev->dest); |
e9705550 CB |
1338 | src = lxc_storage_get_path(bdev->src, bdev->type); |
1339 | bdev->dest = strdup(src); | |
1897e3bc SH |
1340 | } |
1341 | ||
47e55887 CB |
1342 | /* Create our new array, pre-pend the template name and base |
1343 | * args. | |
72d0e1cb SG |
1344 | */ |
1345 | if (argv) | |
47e55887 CB |
1346 | for (nargs = 0; argv[nargs]; nargs++) { |
1347 | ; | |
1348 | } | |
1349 | /* template, path, rootfs and name args */ | |
1350 | nargs += 4; | |
cf3ef16d | 1351 | |
72d0e1cb SG |
1352 | newargv = malloc(nargs * sizeof(*newargv)); |
1353 | if (!newargv) | |
7e34710e | 1354 | _exit(EXIT_FAILURE); |
96b3cb40 | 1355 | newargv[0] = lxcbasename(tpath); |
72d0e1cb | 1356 | |
47e55887 | 1357 | /* --path */ |
2a59a681 | 1358 | len = strlen(c->config_path) + strlen(c->name) + strlen("--path=") + 2; |
72d0e1cb SG |
1359 | patharg = malloc(len); |
1360 | if (!patharg) | |
7e34710e | 1361 | _exit(EXIT_FAILURE); |
2a59a681 | 1362 | ret = snprintf(patharg, len, "--path=%s/%s", c->config_path, c->name); |
72d0e1cb | 1363 | if (ret < 0 || ret >= len) |
7e34710e | 1364 | _exit(EXIT_FAILURE); |
72d0e1cb | 1365 | newargv[1] = patharg; |
47e55887 CB |
1366 | |
1367 | /* --name */ | |
72d0e1cb SG |
1368 | len = strlen("--name=") + strlen(c->name) + 1; |
1369 | namearg = malloc(len); | |
1370 | if (!namearg) | |
7e34710e | 1371 | _exit(EXIT_FAILURE); |
72d0e1cb SG |
1372 | ret = snprintf(namearg, len, "--name=%s", c->name); |
1373 | if (ret < 0 || ret >= len) | |
7e34710e | 1374 | _exit(EXIT_FAILURE); |
72d0e1cb SG |
1375 | newargv[2] = namearg; |
1376 | ||
47e55887 | 1377 | /* --rootfs */ |
1897e3bc SH |
1378 | len = strlen("--rootfs=") + 1 + strlen(bdev->dest); |
1379 | rootfsarg = malloc(len); | |
1380 | if (!rootfsarg) | |
7e34710e | 1381 | _exit(EXIT_FAILURE); |
1897e3bc SH |
1382 | ret = snprintf(rootfsarg, len, "--rootfs=%s", bdev->dest); |
1383 | if (ret < 0 || ret >= len) | |
7e34710e | 1384 | _exit(EXIT_FAILURE); |
1897e3bc SH |
1385 | newargv[3] = rootfsarg; |
1386 | ||
72d0e1cb SG |
1387 | /* add passed-in args */ |
1388 | if (argv) | |
1897e3bc | 1389 | for (i = 4; i < nargs; i++) |
47e55887 | 1390 | newargv[i] = argv[i - 4]; |
72d0e1cb SG |
1391 | |
1392 | /* add trailing NULL */ | |
1393 | nargs++; | |
1394 | newargv = realloc(newargv, nargs * sizeof(*newargv)); | |
1395 | if (!newargv) | |
7e34710e | 1396 | _exit(EXIT_FAILURE); |
72d0e1cb SG |
1397 | newargv[nargs - 1] = NULL; |
1398 | ||
47e55887 CB |
1399 | /* If we're running the template in a mapped userns, then we |
1400 | * prepend the template command with: lxc-usernsexec <-m map1> | |
1401 | * ... <-m mapn> -- and we append "--mapped-uid x", where x is | |
1402 | * the mapped uid for our geteuid() | |
cf3ef16d | 1403 | */ |
0e6e3a41 | 1404 | if (!lxc_list_empty(&conf->id_map)) { |
47e55887 CB |
1405 | int extraargs, hostuid_mapped, hostgid_mapped; |
1406 | char **n2; | |
1407 | char txtuid[20], txtgid[20]; | |
cf3ef16d SH |
1408 | struct lxc_list *it; |
1409 | struct id_map *map; | |
47e55887 | 1410 | int n2args = 1; |
cf3ef16d | 1411 | |
47e55887 CB |
1412 | n2 = malloc(n2args * sizeof(*n2)); |
1413 | if (!n2) | |
7e34710e | 1414 | _exit(EXIT_FAILURE); |
47e55887 | 1415 | |
cf3ef16d SH |
1416 | newargv[0] = tpath; |
1417 | tpath = "lxc-usernsexec"; | |
1418 | n2[0] = "lxc-usernsexec"; | |
1419 | lxc_list_for_each(it, &conf->id_map) { | |
1420 | map = it->elem; | |
1421 | n2args += 2; | |
57d116ab | 1422 | n2 = realloc(n2, n2args * sizeof(char *)); |
cf3ef16d | 1423 | if (!n2) |
7e34710e | 1424 | _exit(EXIT_FAILURE); |
47e55887 CB |
1425 | |
1426 | n2[n2args - 2] = "-m"; | |
1427 | n2[n2args - 1] = malloc(200); | |
1428 | if (!n2[n2args - 1]) | |
7e34710e | 1429 | _exit(EXIT_FAILURE); |
47e55887 CB |
1430 | |
1431 | ret = snprintf(n2[n2args - 1], 200, "%c:%lu:%lu:%lu", | |
1432 | map->idtype == ID_TYPE_UID ? 'u' : 'g', | |
1433 | map->nsid, map->hostid, map->range); | |
cf3ef16d | 1434 | if (ret < 0 || ret >= 200) |
7e34710e | 1435 | _exit(EXIT_FAILURE); |
cf3ef16d | 1436 | } |
47e55887 CB |
1437 | |
1438 | hostuid_mapped = mapped_hostid(geteuid(), conf, ID_TYPE_UID); | |
1439 | extraargs = hostuid_mapped >= 0 ? 1 : 3; | |
57d116ab | 1440 | n2 = realloc(n2, (nargs + n2args + extraargs) * sizeof(char *)); |
cf3ef16d | 1441 | if (!n2) |
7e34710e | 1442 | _exit(EXIT_FAILURE); |
47e55887 CB |
1443 | |
1444 | if (hostuid_mapped < 0) { | |
1445 | hostuid_mapped = find_unmapped_nsid(conf, ID_TYPE_UID); | |
cf3ef16d | 1446 | n2[n2args++] = "-m"; |
47e55887 CB |
1447 | if (hostuid_mapped < 0) { |
1448 | ERROR("Failed to find free uid to map"); | |
7e34710e | 1449 | _exit(EXIT_FAILURE); |
cf3ef16d | 1450 | } |
47e55887 | 1451 | |
cf3ef16d | 1452 | n2[n2args++] = malloc(200); |
47e55887 | 1453 | if (!n2[n2args - 1]) { |
cf3ef16d | 1454 | SYSERROR("out of memory"); |
7e34710e | 1455 | _exit(EXIT_FAILURE); |
cf3ef16d | 1456 | } |
47e55887 CB |
1457 | ret = snprintf(n2[n2args - 1], 200, "u:%d:%d:1", |
1458 | hostuid_mapped, geteuid()); | |
1459 | if (ret < 0 || ret >= 200) | |
7e34710e | 1460 | _exit(EXIT_FAILURE); |
cf3ef16d | 1461 | } |
47e55887 CB |
1462 | |
1463 | hostgid_mapped = mapped_hostid(getegid(), conf, ID_TYPE_GID); | |
2133f58c SH |
1464 | extraargs = hostgid_mapped >= 0 ? 1 : 3; |
1465 | n2 = realloc(n2, (nargs + n2args + extraargs) * sizeof(char *)); | |
1466 | if (!n2) | |
7e34710e | 1467 | _exit(EXIT_FAILURE); |
47e55887 | 1468 | |
2133f58c | 1469 | if (hostgid_mapped < 0) { |
339efad9 | 1470 | hostgid_mapped = find_unmapped_nsid(conf, ID_TYPE_GID); |
2133f58c SH |
1471 | n2[n2args++] = "-m"; |
1472 | if (hostgid_mapped < 0) { | |
47e55887 | 1473 | ERROR("Failed to find free gid to map"); |
7e34710e | 1474 | _exit(EXIT_FAILURE); |
2133f58c | 1475 | } |
47e55887 | 1476 | |
2133f58c | 1477 | n2[n2args++] = malloc(200); |
47e55887 | 1478 | if (!n2[n2args - 1]) { |
2133f58c | 1479 | SYSERROR("out of memory"); |
7e34710e | 1480 | _exit(EXIT_FAILURE); |
2133f58c | 1481 | } |
47e55887 CB |
1482 | |
1483 | ret = snprintf(n2[n2args - 1], 200, "g:%d:%d:1", | |
1484 | hostgid_mapped, getegid()); | |
1485 | if (ret < 0 || ret >= 200) | |
7e34710e | 1486 | _exit(EXIT_FAILURE); |
2133f58c | 1487 | } |
cf3ef16d SH |
1488 | n2[n2args++] = "--"; |
1489 | for (i = 0; i < nargs; i++) | |
1490 | n2[i + n2args] = newargv[i]; | |
57d116ab | 1491 | n2args += nargs; |
47e55887 CB |
1492 | |
1493 | /* Finally add "--mapped-uid $uid" to tell template what | |
1494 | * to chown cached images to. | |
1a0e70ac | 1495 | */ |
2133f58c | 1496 | n2args += 4; |
57d116ab | 1497 | n2 = realloc(n2, n2args * sizeof(char *)); |
47e55887 | 1498 | if (!n2) |
7e34710e | 1499 | _exit(EXIT_FAILURE); |
47e55887 | 1500 | |
1a0e70ac | 1501 | /* note n2[n2args-1] is NULL */ |
47e55887 CB |
1502 | n2[n2args - 5] = "--mapped-uid"; |
1503 | snprintf(txtuid, 20, "%d", hostuid_mapped); | |
1504 | n2[n2args - 4] = txtuid; | |
1505 | n2[n2args - 3] = "--mapped-gid"; | |
2133f58c | 1506 | snprintf(txtgid, 20, "%d", hostgid_mapped); |
47e55887 CB |
1507 | n2[n2args - 2] = txtgid; |
1508 | n2[n2args - 1] = NULL; | |
cf3ef16d SH |
1509 | free(newargv); |
1510 | newargv = n2; | |
1511 | } | |
47e55887 | 1512 | |
cf3ef16d | 1513 | execvp(tpath, newargv); |
e9705550 | 1514 | SYSERROR("Failed to execute template %s", tpath); |
7e34710e | 1515 | _exit(EXIT_FAILURE); |
72d0e1cb SG |
1516 | } |
1517 | ||
47e55887 CB |
1518 | ret = wait_for_pid(pid); |
1519 | if (ret != 0) { | |
1520 | ERROR("Failed to create container from template"); | |
96b3cb40 SH |
1521 | return false; |
1522 | } | |
1523 | ||
1524 | return true; | |
1525 | } | |
1526 | ||
74a3920a | 1527 | static bool prepend_lxc_header(char *path, const char *t, char *const argv[]) |
3ce74686 | 1528 | { |
1fd9bd50 | 1529 | long flen; |
b4569e93 | 1530 | char *contents; |
3ce74686 | 1531 | FILE *f; |
025ed0f3 | 1532 | int ret = -1; |
52026772 | 1533 | #if HAVE_LIBGNUTLS |
025ed0f3 | 1534 | int i; |
3ce74686 | 1535 | unsigned char md_value[SHA_DIGEST_LENGTH]; |
b4569e93 | 1536 | char *tpath; |
52026772 | 1537 | #endif |
3ce74686 | 1538 | |
025ed0f3 | 1539 | f = fopen(path, "r"); |
025ed0f3 | 1540 | if (f == NULL) |
3ce74686 | 1541 | return false; |
025ed0f3 SH |
1542 | |
1543 | if (fseek(f, 0, SEEK_END) < 0) | |
1544 | goto out_error; | |
1545 | if ((flen = ftell(f)) < 0) | |
1546 | goto out_error; | |
1547 | if (fseek(f, 0, SEEK_SET) < 0) | |
1548 | goto out_error; | |
1549 | if ((contents = malloc(flen + 1)) == NULL) | |
1550 | goto out_error; | |
1551 | if (fread(contents, 1, flen, f) != flen) | |
1552 | goto out_free_contents; | |
1553 | ||
3ce74686 | 1554 | contents[flen] = '\0'; |
025ed0f3 | 1555 | ret = fclose(f); |
025ed0f3 SH |
1556 | f = NULL; |
1557 | if (ret < 0) | |
1558 | goto out_free_contents; | |
3ce74686 | 1559 | |
b4569e93 | 1560 | #if HAVE_LIBGNUTLS |
01efd4d3 | 1561 | tpath = get_template_path(t); |
85db5535 | 1562 | if (!tpath) { |
959aee9c | 1563 | ERROR("bad template: %s", t); |
025ed0f3 | 1564 | goto out_free_contents; |
3ce74686 SH |
1565 | } |
1566 | ||
85db5535 DE |
1567 | ret = sha1sum_file(tpath, md_value); |
1568 | if (ret < 0) { | |
1569 | ERROR("Error getting sha1sum of %s", tpath); | |
3ce74686 | 1570 | free(tpath); |
85db5535 | 1571 | goto out_free_contents; |
3ce74686 | 1572 | } |
85db5535 | 1573 | free(tpath); |
3ce74686 SH |
1574 | #endif |
1575 | ||
025ed0f3 | 1576 | f = fopen(path, "w"); |
025ed0f3 | 1577 | if (f == NULL) { |
3ce74686 SH |
1578 | SYSERROR("reopening config for writing"); |
1579 | free(contents); | |
1580 | return false; | |
1581 | } | |
1582 | fprintf(f, "# Template used to create this container: %s\n", t); | |
1583 | if (argv) { | |
1584 | fprintf(f, "# Parameters passed to the template:"); | |
1585 | while (*argv) { | |
1586 | fprintf(f, " %s", *argv); | |
1587 | argv++; | |
1588 | } | |
1589 | fprintf(f, "\n"); | |
1590 | } | |
1591 | #if HAVE_LIBGNUTLS | |
56698177 SH |
1592 | fprintf(f, "# Template script checksum (SHA-1): "); |
1593 | for (i=0; i<SHA_DIGEST_LENGTH; i++) | |
1594 | fprintf(f, "%02x", md_value[i]); | |
1595 | fprintf(f, "\n"); | |
3ce74686 | 1596 | #endif |
0520c252 | 1597 | fprintf(f, "# For additional config options, please look at lxc.container.conf(5)\n"); |
49a2ed80 SH |
1598 | fprintf(f, "\n# Uncomment the following line to support nesting containers:\n"); |
1599 | fprintf(f, "#lxc.include = " LXCTEMPLATECONFIG "/nesting.conf\n"); | |
1600 | fprintf(f, "# (Be aware this has security implications)\n\n"); | |
3ce74686 SH |
1601 | if (fwrite(contents, 1, flen, f) != flen) { |
1602 | SYSERROR("Writing original contents"); | |
1603 | free(contents); | |
1604 | fclose(f); | |
1605 | return false; | |
1606 | } | |
025ed0f3 SH |
1607 | ret = 0; |
1608 | out_free_contents: | |
3ce74686 | 1609 | free(contents); |
025ed0f3 SH |
1610 | out_error: |
1611 | if (f) { | |
1612 | int newret; | |
025ed0f3 | 1613 | newret = fclose(f); |
025ed0f3 SH |
1614 | if (ret == 0) |
1615 | ret = newret; | |
1616 | } | |
1617 | if (ret < 0) { | |
1618 | SYSERROR("Error prepending header"); | |
3ce74686 SH |
1619 | return false; |
1620 | } | |
1621 | return true; | |
1622 | } | |
1623 | ||
4df7f012 SH |
1624 | static void lxcapi_clear_config(struct lxc_container *c) |
1625 | { | |
f979ac15 SH |
1626 | if (c) { |
1627 | if (c->lxc_conf) { | |
1628 | lxc_conf_free(c->lxc_conf); | |
1629 | c->lxc_conf = NULL; | |
1630 | } | |
4df7f012 SH |
1631 | } |
1632 | } | |
1633 | ||
858377e4 SH |
1634 | #define do_lxcapi_clear_config(c) lxcapi_clear_config(c) |
1635 | ||
96b3cb40 SH |
1636 | /* |
1637 | * lxcapi_create: | |
1638 | * create a container with the given parameters. | |
1639 | * @c: container to be created. It has the lxcpath, name, and a starting | |
1640 | * configuration already set | |
1641 | * @t: the template to execute to instantiate the root filesystem and | |
1642 | * adjust the configuration. | |
1643 | * @bdevtype: backing store type to use. If NULL, dir will be used. | |
1644 | * @specs: additional parameters for the backing store, i.e. LVM vg to | |
1645 | * use. | |
1646 | * | |
1647 | * @argv: the arguments to pass to the template, terminated by NULL. If no | |
1648 | * arguments, you can just pass NULL. | |
1649 | */ | |
858377e4 | 1650 | static bool do_lxcapi_create(struct lxc_container *c, const char *t, |
85aec4ac CB |
1651 | const char *bdevtype, struct bdev_specs *specs, |
1652 | int flags, char *const argv[]) | |
96b3cb40 | 1653 | { |
e9e29a33 | 1654 | int partial_fd; |
96b3cb40 | 1655 | pid_t pid; |
e9e29a33 | 1656 | bool ret = false; |
85db5535 | 1657 | char *tpath = NULL; |
96b3cb40 SH |
1658 | |
1659 | if (!c) | |
1660 | return false; | |
1661 | ||
85db5535 DE |
1662 | if (t) { |
1663 | tpath = get_template_path(t); | |
1664 | if (!tpath) { | |
e9e29a33 | 1665 | ERROR("Unknown template \"%s\"", t); |
85db5535 DE |
1666 | goto out; |
1667 | } | |
96b3cb40 SH |
1668 | } |
1669 | ||
e9e29a33 CB |
1670 | /* If a template is passed in, and the rootfs already is defined in the |
1671 | * container config and exists, then the caller is trying to create an | |
1672 | * existing container. Return an error, but do NOT delete the container. | |
cf465fe4 | 1673 | */ |
858377e4 | 1674 | if (do_lxcapi_is_defined(c) && c->lxc_conf && c->lxc_conf->rootfs.path && |
cf465fe4 | 1675 | access(c->lxc_conf->rootfs.path, F_OK) == 0 && tpath) { |
e9e29a33 CB |
1676 | ERROR("Container \"%s\" already exists in \"%s\"", c->name, |
1677 | c->config_path); | |
6c6892b5 | 1678 | goto free_tpath; |
cf465fe4 SH |
1679 | } |
1680 | ||
6c6892b5 | 1681 | if (!c->lxc_conf) { |
858377e4 | 1682 | if (!do_lxcapi_load_config(c, lxc_global_config_value("lxc.default_config"))) { |
e9e29a33 CB |
1683 | ERROR("Error loading default configuration file %s", |
1684 | lxc_global_config_value("lxc.default_config")); | |
6c6892b5 DE |
1685 | goto free_tpath; |
1686 | } | |
96b3cb40 SH |
1687 | } |
1688 | ||
6c6892b5 DE |
1689 | if (!create_container_dir(c)) |
1690 | goto free_tpath; | |
1691 | ||
e9e29a33 CB |
1692 | /* If both template and rootfs.path are set, template is setup as |
1693 | * rootfs.path. The container is already created if we have a config and | |
1694 | * rootfs.path is accessible | |
0590e82c | 1695 | */ |
00370edd | 1696 | if (!c->lxc_conf->rootfs.path && !tpath) { |
e9e29a33 | 1697 | /* No template passed in and rootfs does not exist. */ |
00370edd | 1698 | if (!c->save_config(c, NULL)) { |
e9e29a33 | 1699 | ERROR("Failed to save initial config for \"%s\"", c->name); |
00370edd DW |
1700 | goto out; |
1701 | } | |
1702 | ret = true; | |
0590e82c | 1703 | goto out; |
00370edd | 1704 | } |
e9e29a33 CB |
1705 | |
1706 | /* Rootfs passed into configuration, but does not exist. */ | |
0590e82c | 1707 | if (c->lxc_conf->rootfs.path && access(c->lxc_conf->rootfs.path, F_OK) != 0) |
0590e82c | 1708 | goto out; |
e9e29a33 | 1709 | |
858377e4 | 1710 | if (do_lxcapi_is_defined(c) && c->lxc_conf->rootfs.path && !tpath) { |
e9e29a33 CB |
1711 | /* Rootfs already existed, user just wanted to save the loaded |
1712 | * configuration. | |
1713 | */ | |
0f4cdd77 | 1714 | if (!c->save_config(c, NULL)) |
e9e29a33 | 1715 | ERROR("Failed to save initial config for \"%s\"", c->name); |
0590e82c SH |
1716 | ret = true; |
1717 | goto out; | |
a69aad27 | 1718 | } |
96b3cb40 SH |
1719 | |
1720 | /* Mark that this container is being created */ | |
e9e29a33 CB |
1721 | partial_fd = create_partial(c); |
1722 | if (partial_fd < 0) | |
96b3cb40 SH |
1723 | goto out; |
1724 | ||
e9e29a33 | 1725 | /* No need to get disk lock bc we have the partial lock. */ |
96b3cb40 | 1726 | |
e9e29a33 | 1727 | /* Create the storage. |
96b3cb40 SH |
1728 | * Note we can't do this in the same task as we use to execute the |
1729 | * template because of the way zfs works. | |
1730 | * After you 'zfs create', zfs mounts the fs only in the initial | |
1731 | * namespace. | |
1732 | */ | |
1733 | pid = fork(); | |
1734 | if (pid < 0) { | |
e9e29a33 | 1735 | SYSERROR("Failed to fork task for container creation template"); |
8eb5694b SH |
1736 | goto out_unlock; |
1737 | } | |
1738 | ||
1a0e70ac | 1739 | if (pid == 0) { /* child */ |
10bc1861 | 1740 | struct lxc_storage *bdev = NULL; |
96b3cb40 | 1741 | |
10bc1861 CB |
1742 | bdev = do_storage_create(c, bdevtype, specs); |
1743 | if (!bdev) { | |
e9e29a33 CB |
1744 | ERROR("Failed to create %s storage for %s", |
1745 | bdevtype ? bdevtype : "(none)", c->name); | |
85aec4ac | 1746 | _exit(EXIT_FAILURE); |
96b3cb40 SH |
1747 | } |
1748 | ||
e9e29a33 | 1749 | /* Save config file again to store the new rootfs location. */ |
858377e4 | 1750 | if (!do_lxcapi_save_config(c, NULL)) { |
e9e29a33 CB |
1751 | ERROR("Failed to save initial config for %s", c->name); |
1752 | /* Parent task won't see the storage driver in the | |
1753 | * config so we delete it. | |
1754 | */ | |
96b3cb40 SH |
1755 | bdev->ops->umount(bdev); |
1756 | bdev->ops->destroy(bdev); | |
85aec4ac | 1757 | _exit(EXIT_FAILURE); |
96b3cb40 | 1758 | } |
85aec4ac | 1759 | _exit(EXIT_SUCCESS); |
96b3cb40 SH |
1760 | } |
1761 | if (wait_for_pid(pid) != 0) | |
a09295f8 | 1762 | goto out_unlock; |
96b3cb40 | 1763 | |
e9e29a33 | 1764 | /* Reload config to get the rootfs. */ |
a3b47c09 | 1765 | lxc_conf_free(c->lxc_conf); |
96b3cb40 SH |
1766 | c->lxc_conf = NULL; |
1767 | if (!load_config_locked(c, c->configfile)) | |
a09295f8 | 1768 | goto out_unlock; |
96b3cb40 | 1769 | |
dc23c1c8 | 1770 | if (!create_run_template(c, tpath, !!(flags & LXC_CREATE_QUIET), argv)) |
96b3cb40 SH |
1771 | goto out_unlock; |
1772 | ||
1a0e70ac CB |
1773 | /* Now clear out the lxc_conf we have, reload from the created |
1774 | * container. | |
1775 | */ | |
858377e4 | 1776 | do_lxcapi_clear_config(c); |
3ce74686 | 1777 | |
9d65a487 KY |
1778 | if (t) { |
1779 | if (!prepend_lxc_header(c->configfile, tpath, argv)) { | |
e9e29a33 | 1780 | ERROR("Failed to prepend header to config file"); |
9d65a487 KY |
1781 | goto out_unlock; |
1782 | } | |
3ce74686 | 1783 | } |
a69aad27 | 1784 | ret = load_config_locked(c, c->configfile); |
72d0e1cb SG |
1785 | |
1786 | out_unlock: | |
3e625e2d SH |
1787 | if (partial_fd >= 0) |
1788 | remove_partial(c, partial_fd); | |
72d0e1cb | 1789 | out: |
c55d4505 | 1790 | if (!ret) |
17a367d8 | 1791 | container_destroy(c, NULL); |
6c6892b5 | 1792 | free_tpath: |
f10fad2f | 1793 | free(tpath); |
a69aad27 | 1794 | return ret; |
72d0e1cb SG |
1795 | } |
1796 | ||
858377e4 | 1797 | static bool lxcapi_create(struct lxc_container *c, const char *t, |
e9e29a33 CB |
1798 | const char *bdevtype, struct bdev_specs *specs, |
1799 | int flags, char *const argv[]) | |
858377e4 SH |
1800 | { |
1801 | bool ret; | |
1802 | current_config = c ? c->lxc_conf : NULL; | |
1803 | ret = do_lxcapi_create(c, t, bdevtype, specs, flags, argv); | |
1804 | current_config = NULL; | |
1805 | return ret; | |
1806 | } | |
1807 | ||
1808 | static bool do_lxcapi_reboot(struct lxc_container *c) | |
3e625e2d SH |
1809 | { |
1810 | pid_t pid; | |
dd267776 | 1811 | int rebootsignal = SIGINT; |
3e625e2d SH |
1812 | |
1813 | if (!c) | |
1814 | return false; | |
858377e4 | 1815 | if (!do_lxcapi_is_running(c)) |
3e625e2d | 1816 | return false; |
858377e4 | 1817 | pid = do_lxcapi_init_pid(c); |
3e625e2d SH |
1818 | if (pid <= 0) |
1819 | return false; | |
dd267776 BP |
1820 | if (c->lxc_conf && c->lxc_conf->rebootsignal) |
1821 | rebootsignal = c->lxc_conf->rebootsignal; | |
591614a7 CB |
1822 | if (kill(pid, rebootsignal) < 0) { |
1823 | WARN("Could not send signal %d to pid %d.", rebootsignal, pid); | |
3e625e2d | 1824 | return false; |
591614a7 | 1825 | } |
3e625e2d SH |
1826 | return true; |
1827 | ||
1828 | } | |
1829 | ||
858377e4 SH |
1830 | WRAP_API(bool, lxcapi_reboot) |
1831 | ||
d39b10eb CB |
1832 | static bool do_lxcapi_reboot2(struct lxc_container *c, int timeout) |
1833 | { | |
1834 | int killret, ret; | |
1835 | pid_t pid; | |
1836 | int rebootsignal = SIGINT, state_client_fd = -1; | |
1837 | lxc_state_t states[MAX_STATE] = {0}; | |
1838 | ||
1839 | if (!c) | |
1840 | return false; | |
1841 | ||
1842 | if (!do_lxcapi_is_running(c)) | |
1843 | return true; | |
1844 | ||
1845 | pid = do_lxcapi_init_pid(c); | |
1846 | if (pid <= 0) | |
1847 | return true; | |
1848 | ||
1849 | if (c->lxc_conf && c->lxc_conf->rebootsignal) | |
1850 | rebootsignal = c->lxc_conf->rebootsignal; | |
1851 | ||
1852 | /* Add a new state client before sending the shutdown signal so that we | |
1853 | * don't miss a state. | |
1854 | */ | |
1855 | if (timeout != 0) { | |
1856 | states[RUNNING] = 2; | |
1857 | ret = lxc_cmd_add_state_client(c->name, c->config_path, states, | |
1858 | &state_client_fd); | |
1859 | if (ret < 0) | |
1860 | return false; | |
1861 | ||
1862 | if (state_client_fd < 0) | |
1863 | return false; | |
1864 | ||
1865 | if (ret == RUNNING) | |
1866 | return true; | |
1867 | ||
1868 | if (ret < MAX_STATE) | |
1869 | return false; | |
1870 | } | |
1871 | ||
1872 | /* Send reboot signal to container. */ | |
1873 | killret = kill(pid, rebootsignal); | |
1874 | if (killret < 0) { | |
1875 | WARN("Could not send signal %d to pid %d", rebootsignal, pid); | |
1876 | if (state_client_fd >= 0) | |
1877 | close(state_client_fd); | |
1878 | return false; | |
1879 | } | |
1880 | TRACE("Sent signal %d to pid %d", rebootsignal, pid); | |
1881 | ||
1882 | if (timeout == 0) | |
1883 | return true; | |
1884 | ||
1885 | ret = lxc_cmd_sock_rcv_state(state_client_fd, timeout); | |
1886 | close(state_client_fd); | |
1887 | if (ret < 0) | |
1888 | return false; | |
1889 | ||
1890 | TRACE("Received state \"%s\"", lxc_state2str(ret)); | |
1891 | if (ret != RUNNING) | |
1892 | return false; | |
1893 | ||
1894 | return true; | |
1895 | } | |
1896 | ||
1897 | WRAP_API_1(bool, lxcapi_reboot2, int) | |
1898 | ||
858377e4 | 1899 | static bool do_lxcapi_shutdown(struct lxc_container *c, int timeout) |
72d0e1cb | 1900 | { |
f8bdb6dc | 1901 | int killret, ret; |
72d0e1cb | 1902 | pid_t pid; |
f8bdb6dc | 1903 | int haltsignal = SIGPWR, state_client_fd = -1; |
92e35018 | 1904 | lxc_state_t states[MAX_STATE] = {0}; |
72d0e1cb SG |
1905 | |
1906 | if (!c) | |
1907 | return false; | |
1908 | ||
858377e4 | 1909 | if (!do_lxcapi_is_running(c)) |
72d0e1cb | 1910 | return true; |
f8bdb6dc | 1911 | |
858377e4 | 1912 | pid = do_lxcapi_init_pid(c); |
72d0e1cb SG |
1913 | if (pid <= 0) |
1914 | return true; | |
330ae3d3 CB |
1915 | |
1916 | /* Detect whether we should send SIGRTMIN + 3 (e.g. systemd). */ | |
1917 | if (task_blocking_signal(pid, (SIGRTMIN + 3))) | |
1918 | haltsignal = (SIGRTMIN + 3); | |
1919 | ||
b0227444 | 1920 | if (c->lxc_conf && c->lxc_conf->haltsignal) |
f0f1d8c0 | 1921 | haltsignal = c->lxc_conf->haltsignal; |
330ae3d3 | 1922 | |
92e35018 CB |
1923 | /* Add a new state client before sending the shutdown signal so that we |
1924 | * don't miss a state. | |
1925 | */ | |
f8bdb6dc CB |
1926 | if (timeout != 0) { |
1927 | states[STOPPED] = 1; | |
1928 | ret = lxc_cmd_add_state_client(c->name, c->config_path, states, | |
1929 | &state_client_fd); | |
1930 | if (ret < 0) | |
1931 | return false; | |
92e35018 | 1932 | |
f8bdb6dc CB |
1933 | if (state_client_fd < 0) |
1934 | return false; | |
1935 | ||
1936 | if (ret == STOPPED) | |
1937 | return true; | |
591614a7 | 1938 | |
f8bdb6dc | 1939 | if (ret < MAX_STATE) |
92e35018 | 1940 | return false; |
92e35018 CB |
1941 | } |
1942 | ||
f8bdb6dc CB |
1943 | /* Send shutdown signal to container. */ |
1944 | killret = kill(pid, haltsignal); | |
1945 | if (killret < 0) { | |
1946 | WARN("Could not send signal %d to pid %d", haltsignal, pid); | |
1947 | if (state_client_fd >= 0) | |
1948 | close(state_client_fd); | |
1949 | return false; | |
1950 | } | |
1951 | TRACE("Sent signal %d to pid %d", haltsignal, pid); | |
1952 | ||
1953 | if (timeout == 0) | |
1954 | return true; | |
1955 | ||
1956 | ret = lxc_cmd_sock_rcv_state(state_client_fd, timeout); | |
1957 | close(state_client_fd); | |
1958 | if (ret < 0) | |
1959 | return false; | |
1960 | ||
1961 | TRACE("Received state \"%s\"", lxc_state2str(ret)); | |
1962 | if (ret != STOPPED) | |
1963 | return false; | |
1964 | ||
1965 | return true; | |
72d0e1cb SG |
1966 | } |
1967 | ||
858377e4 SH |
1968 | WRAP_API_1(bool, lxcapi_shutdown, int) |
1969 | ||
1897e3bc | 1970 | static bool lxcapi_createl(struct lxc_container *c, const char *t, |
dc23c1c8 | 1971 | const char *bdevtype, struct bdev_specs *specs, int flags, ...) |
72d0e1cb SG |
1972 | { |
1973 | bool bret = false; | |
a0e93eeb | 1974 | char **args = NULL; |
72d0e1cb | 1975 | va_list ap; |
72d0e1cb SG |
1976 | |
1977 | if (!c) | |
1978 | return false; | |
1979 | ||
858377e4 SH |
1980 | current_config = c->lxc_conf; |
1981 | ||
72d0e1cb SG |
1982 | /* |
1983 | * since we're going to wait for create to finish, I don't think we | |
1984 | * need to get a copy of the arguments. | |
1985 | */ | |
dc23c1c8 | 1986 | va_start(ap, flags); |
a0e93eeb | 1987 | args = lxc_va_arg_list_to_argv(ap, 0, 0); |
72d0e1cb | 1988 | va_end(ap); |
a0e93eeb | 1989 | if (!args) { |
e9e29a33 | 1990 | ERROR("Failed to allocate memory"); |
a0e93eeb CS |
1991 | goto out; |
1992 | } | |
72d0e1cb | 1993 | |
858377e4 | 1994 | bret = do_lxcapi_create(c, t, bdevtype, specs, flags, args); |
72d0e1cb SG |
1995 | |
1996 | out: | |
a0e93eeb | 1997 | free(args); |
858377e4 | 1998 | current_config = NULL; |
72d0e1cb SG |
1999 | return bret; |
2000 | } | |
2001 | ||
6b0d5538 SH |
2002 | static void do_clear_unexp_config_line(struct lxc_conf *conf, const char *key) |
2003 | { | |
4222a9f4 CB |
2004 | if (!strcmp(key, "lxc.cgroup")) |
2005 | return clear_unexp_config_line(conf, key, true); | |
2006 | ||
2007 | if (!strcmp(key, "lxc.network")) | |
2008 | return clear_unexp_config_line(conf, key, true); | |
2009 | ||
2010 | if (!strcmp(key, "lxc.net")) | |
2011 | return clear_unexp_config_line(conf, key, true); | |
2012 | ||
2013 | /* Clear a network with a specific index. */ | |
2014 | if (!strncmp(key, "lxc.net.", 8)) { | |
2015 | int ret; | |
2016 | const char *idx; | |
2017 | ||
2018 | idx = key + 8; | |
2019 | ret = lxc_safe_uint(idx, &(unsigned int){0}); | |
2020 | if (!ret) | |
2021 | return clear_unexp_config_line(conf, key, true); | |
2022 | } | |
2023 | ||
2024 | if (!strcmp(key, "lxc.hook")) | |
2025 | return clear_unexp_config_line(conf, key, true); | |
2026 | ||
2027 | return clear_unexp_config_line(conf, key, false); | |
6b0d5538 SH |
2028 | } |
2029 | ||
6afd673f CB |
2030 | static bool do_lxcapi_clear_config_item(struct lxc_container *c, |
2031 | const char *key) | |
72d0e1cb | 2032 | { |
6afd673f CB |
2033 | int ret = 1; |
2034 | struct lxc_config_t *config; | |
72d0e1cb SG |
2035 | |
2036 | if (!c || !c->lxc_conf) | |
2037 | return false; | |
6afd673f | 2038 | |
5cee8c50 | 2039 | if (container_mem_lock(c)) |
72d0e1cb | 2040 | return false; |
6afd673f | 2041 | |
300df83e | 2042 | config = lxc_get_config(key); |
6afd673f CB |
2043 | /* Verify that the config key exists and that it has a callback |
2044 | * implemented. | |
2045 | */ | |
2046 | if (config && config->clr) | |
26471403 | 2047 | ret = config->clr(key, c->lxc_conf, NULL); |
6b0d5538 SH |
2048 | if (!ret) |
2049 | do_clear_unexp_config_line(c->lxc_conf, key); | |
6afd673f | 2050 | |
5cee8c50 | 2051 | container_mem_unlock(c); |
72d0e1cb SG |
2052 | return ret == 0; |
2053 | } | |
2054 | ||
858377e4 SH |
2055 | WRAP_API_1(bool, lxcapi_clear_config_item, const char *) |
2056 | ||
e0f59189 | 2057 | static inline bool enter_net_ns(struct lxc_container *c) |
51d0854c | 2058 | { |
858377e4 | 2059 | pid_t pid = do_lxcapi_init_pid(c); |
ae22a220 | 2060 | |
0e6e3a41 | 2061 | if ((geteuid() != 0 || (c->lxc_conf && !lxc_list_empty(&c->lxc_conf->id_map))) && access("/proc/self/ns/user", F_OK) == 0) { |
51d0854c DY |
2062 | if (!switch_to_ns(pid, "user")) |
2063 | return false; | |
9c83a661 | 2064 | } |
51d0854c | 2065 | return switch_to_ns(pid, "net"); |
799f29ab ÇO |
2066 | } |
2067 | ||
1a0e70ac | 2068 | /* Used by qsort and bsearch functions for comparing names. */ |
9c88ff1f ÇO |
2069 | static inline int string_cmp(char **first, char **second) |
2070 | { | |
2071 | return strcmp(*first, *second); | |
2072 | } | |
2073 | ||
1a0e70ac CB |
2074 | /* Used by qsort and bsearch functions for comparing container names. */ |
2075 | static inline int container_cmp(struct lxc_container **first, | |
2076 | struct lxc_container **second) | |
9c88ff1f ÇO |
2077 | { |
2078 | return strcmp((*first)->name, (*second)->name); | |
2079 | } | |
2080 | ||
2081 | static bool add_to_array(char ***names, char *cname, int pos) | |
2082 | { | |
2083 | char **newnames = realloc(*names, (pos+1) * sizeof(char *)); | |
2084 | if (!newnames) { | |
2085 | ERROR("Out of memory"); | |
2086 | return false; | |
2087 | } | |
2088 | ||
2089 | *names = newnames; | |
2090 | newnames[pos] = strdup(cname); | |
2091 | if (!newnames[pos]) | |
2092 | return false; | |
2093 | ||
1a0e70ac CB |
2094 | /* Sort the arrray as we will use binary search on it. */ |
2095 | qsort(newnames, pos + 1, sizeof(char *), | |
2096 | (int (*)(const void *, const void *))string_cmp); | |
9c88ff1f ÇO |
2097 | |
2098 | return true; | |
2099 | } | |
2100 | ||
1a0e70ac CB |
2101 | static bool add_to_clist(struct lxc_container ***list, struct lxc_container *c, |
2102 | int pos, bool sort) | |
9c88ff1f | 2103 | { |
1a0e70ac | 2104 | struct lxc_container **newlist = realloc(*list, (pos + 1) * sizeof(struct lxc_container *)); |
9c88ff1f ÇO |
2105 | if (!newlist) { |
2106 | ERROR("Out of memory"); | |
2107 | return false; | |
2108 | } | |
2109 | ||
2110 | *list = newlist; | |
2111 | newlist[pos] = c; | |
2112 | ||
1a0e70ac | 2113 | /* Sort the arrray as we will use binary search on it. */ |
2871830a | 2114 | if (sort) |
1a0e70ac CB |
2115 | qsort(newlist, pos + 1, sizeof(struct lxc_container *), |
2116 | (int (*)(const void *, const void *))container_cmp); | |
9c88ff1f ÇO |
2117 | |
2118 | return true; | |
2119 | } | |
2120 | ||
2121 | static char** get_from_array(char ***names, char *cname, int size) | |
2122 | { | |
2123 | return (char **)bsearch(&cname, *names, size, sizeof(char *), (int (*)(const void *, const void *))string_cmp); | |
2124 | } | |
2125 | ||
2126 | ||
2127 | static bool array_contains(char ***names, char *cname, int size) { | |
2128 | if(get_from_array(names, cname, size) != NULL) | |
2129 | return true; | |
2130 | return false; | |
2131 | } | |
2132 | ||
2133 | static bool remove_from_array(char ***names, char *cname, int size) | |
2134 | { | |
2135 | char **result = get_from_array(names, cname, size); | |
2136 | if (result != NULL) { | |
2137 | free(result); | |
2138 | return true; | |
2139 | } | |
2140 | return false; | |
2141 | } | |
2142 | ||
858377e4 | 2143 | static char ** do_lxcapi_get_interfaces(struct lxc_container *c) |
799f29ab | 2144 | { |
ae22a220 ÇO |
2145 | pid_t pid; |
2146 | int i, count = 0, pipefd[2]; | |
9c88ff1f | 2147 | char **interfaces = NULL; |
ae22a220 | 2148 | char interface[IFNAMSIZ]; |
799f29ab | 2149 | |
ae22a220 ÇO |
2150 | if(pipe(pipefd) < 0) { |
2151 | SYSERROR("pipe failed"); | |
2152 | return NULL; | |
c868b261 ÇO |
2153 | } |
2154 | ||
ae22a220 ÇO |
2155 | pid = fork(); |
2156 | if (pid < 0) { | |
959aee9c | 2157 | SYSERROR("failed to fork task to get interfaces information"); |
ae22a220 ÇO |
2158 | close(pipefd[0]); |
2159 | close(pipefd[1]); | |
2160 | return NULL; | |
2161 | } | |
799f29ab | 2162 | |
1a0e70ac | 2163 | if (pid == 0) { /* child */ |
ae22a220 ÇO |
2164 | int ret = 1, nbytes; |
2165 | struct ifaddrs *interfaceArray = NULL, *tempIfAddr = NULL; | |
2166 | ||
2167 | /* close the read-end of the pipe */ | |
2168 | close(pipefd[0]); | |
2169 | ||
e0f59189 | 2170 | if (!enter_net_ns(c)) { |
ae22a220 ÇO |
2171 | SYSERROR("failed to enter namespace"); |
2172 | goto out; | |
2173 | } | |
2174 | ||
2175 | /* Grab the list of interfaces */ | |
2176 | if (getifaddrs(&interfaceArray)) { | |
2177 | SYSERROR("failed to get interfaces list"); | |
2178 | goto out; | |
2179 | } | |
2180 | ||
2181 | /* Iterate through the interfaces */ | |
2182 | for (tempIfAddr = interfaceArray; tempIfAddr != NULL; tempIfAddr = tempIfAddr->ifa_next) { | |
2183 | nbytes = write(pipefd[1], tempIfAddr->ifa_name, IFNAMSIZ); | |
2184 | if (nbytes < 0) { | |
2185 | ERROR("write failed"); | |
2186 | goto out; | |
2187 | } | |
2188 | count++; | |
2189 | } | |
2190 | ret = 0; | |
2191 | ||
2192 | out: | |
2193 | if (interfaceArray) | |
2194 | freeifaddrs(interfaceArray); | |
2195 | ||
2196 | /* close the write-end of the pipe, thus sending EOF to the reader */ | |
2197 | close(pipefd[1]); | |
02c611b0 | 2198 | _exit(ret); |
799f29ab ÇO |
2199 | } |
2200 | ||
ae22a220 ÇO |
2201 | /* close the write-end of the pipe */ |
2202 | close(pipefd[1]); | |
2203 | ||
358afd84 | 2204 | while (read(pipefd[0], &interface, IFNAMSIZ) == IFNAMSIZ) { |
3151d4e2 CB |
2205 | interface[IFNAMSIZ - 1] = '\0'; |
2206 | ||
ae22a220 ÇO |
2207 | if (array_contains(&interfaces, interface, count)) |
2208 | continue; | |
799f29ab | 2209 | |
ae22a220 | 2210 | if(!add_to_array(&interfaces, interface, count)) |
3151d4e2 CB |
2211 | ERROR("Failed to add \"%s\" to array", interface); |
2212 | ||
9c88ff1f ÇO |
2213 | count++; |
2214 | } | |
799f29ab | 2215 | |
ae22a220 ÇO |
2216 | if (wait_for_pid(pid) != 0) { |
2217 | for(i=0;i<count;i++) | |
2218 | free(interfaces[i]); | |
2219 | free(interfaces); | |
2220 | interfaces = NULL; | |
2221 | } | |
9c88ff1f | 2222 | |
ae22a220 ÇO |
2223 | /* close the read-end of the pipe */ |
2224 | close(pipefd[0]); | |
799f29ab | 2225 | |
9c88ff1f ÇO |
2226 | /* Append NULL to the array */ |
2227 | if(interfaces) | |
2228 | interfaces = (char **)lxc_append_null_to_array((void **)interfaces, count); | |
799f29ab | 2229 | |
9c88ff1f | 2230 | return interfaces; |
799f29ab ÇO |
2231 | } |
2232 | ||
858377e4 SH |
2233 | WRAP_API(char **, lxcapi_get_interfaces) |
2234 | ||
2235 | static char** do_lxcapi_get_ips(struct lxc_container *c, const char* interface, const char* family, int scope) | |
799f29ab | 2236 | { |
ae22a220 ÇO |
2237 | pid_t pid; |
2238 | int i, count = 0, pipefd[2]; | |
9c88ff1f | 2239 | char **addresses = NULL; |
ae22a220 | 2240 | char address[INET6_ADDRSTRLEN]; |
799f29ab | 2241 | |
ae22a220 ÇO |
2242 | if(pipe(pipefd) < 0) { |
2243 | SYSERROR("pipe failed"); | |
2244 | return NULL; | |
c868b261 ÇO |
2245 | } |
2246 | ||
ae22a220 ÇO |
2247 | pid = fork(); |
2248 | if (pid < 0) { | |
959aee9c | 2249 | SYSERROR("failed to fork task to get container ips"); |
ae22a220 ÇO |
2250 | close(pipefd[0]); |
2251 | close(pipefd[1]); | |
2252 | return NULL; | |
9c83a661 SG |
2253 | } |
2254 | ||
1a0e70ac | 2255 | if (pid == 0) { /* child */ |
ae22a220 ÇO |
2256 | int ret = 1, nbytes; |
2257 | struct ifaddrs *interfaceArray = NULL, *tempIfAddr = NULL; | |
2258 | char addressOutputBuffer[INET6_ADDRSTRLEN]; | |
2259 | void *tempAddrPtr = NULL; | |
2260 | char *address = NULL; | |
fe218ca3 | 2261 | |
ae22a220 ÇO |
2262 | /* close the read-end of the pipe */ |
2263 | close(pipefd[0]); | |
2264 | ||
e0f59189 | 2265 | if (!enter_net_ns(c)) { |
ae22a220 ÇO |
2266 | SYSERROR("failed to enter namespace"); |
2267 | goto out; | |
9c83a661 | 2268 | } |
ae22a220 ÇO |
2269 | |
2270 | /* Grab the list of interfaces */ | |
2271 | if (getifaddrs(&interfaceArray)) { | |
2272 | SYSERROR("failed to get interfaces list"); | |
2273 | goto out; | |
2274 | } | |
2275 | ||
2276 | /* Iterate through the interfaces */ | |
2277 | for (tempIfAddr = interfaceArray; tempIfAddr != NULL; tempIfAddr = tempIfAddr->ifa_next) { | |
2278 | if (tempIfAddr->ifa_addr == NULL) | |
9c83a661 SG |
2279 | continue; |
2280 | ||
ae22a220 ÇO |
2281 | if(tempIfAddr->ifa_addr->sa_family == AF_INET) { |
2282 | if (family && strcmp(family, "inet")) | |
2283 | continue; | |
2284 | tempAddrPtr = &((struct sockaddr_in *)tempIfAddr->ifa_addr)->sin_addr; | |
2285 | } | |
2286 | else { | |
2287 | if (family && strcmp(family, "inet6")) | |
2288 | continue; | |
2289 | ||
2290 | if (((struct sockaddr_in6 *)tempIfAddr->ifa_addr)->sin6_scope_id != scope) | |
2291 | continue; | |
2292 | ||
2293 | tempAddrPtr = &((struct sockaddr_in6 *)tempIfAddr->ifa_addr)->sin6_addr; | |
2294 | } | |
2295 | ||
2296 | if (interface && strcmp(interface, tempIfAddr->ifa_name)) | |
2297 | continue; | |
2298 | else if (!interface && strcmp("lo", tempIfAddr->ifa_name) == 0) | |
9c83a661 SG |
2299 | continue; |
2300 | ||
ae22a220 ÇO |
2301 | address = (char *)inet_ntop(tempIfAddr->ifa_addr->sa_family, |
2302 | tempAddrPtr, | |
2303 | addressOutputBuffer, | |
2304 | sizeof(addressOutputBuffer)); | |
2305 | if (!address) | |
2306 | continue; | |
2307 | ||
2308 | nbytes = write(pipefd[1], address, INET6_ADDRSTRLEN); | |
2309 | if (nbytes < 0) { | |
2310 | ERROR("write failed"); | |
2311 | goto out; | |
2312 | } | |
2313 | count++; | |
9c83a661 | 2314 | } |
ae22a220 | 2315 | ret = 0; |
9c83a661 | 2316 | |
ae22a220 ÇO |
2317 | out: |
2318 | if(interfaceArray) | |
2319 | freeifaddrs(interfaceArray); | |
9c83a661 | 2320 | |
ae22a220 ÇO |
2321 | /* close the write-end of the pipe, thus sending EOF to the reader */ |
2322 | close(pipefd[1]); | |
fe1ce58c | 2323 | _exit(ret); |
6849cb5b | 2324 | } |
9c83a661 | 2325 | |
ae22a220 ÇO |
2326 | /* close the write-end of the pipe */ |
2327 | close(pipefd[1]); | |
2328 | ||
358afd84 | 2329 | while (read(pipefd[0], &address, INET6_ADDRSTRLEN) == INET6_ADDRSTRLEN) { |
9c88ff1f | 2330 | if(!add_to_array(&addresses, address, count)) |
ae22a220 | 2331 | ERROR("PARENT: add_to_array failed"); |
9c88ff1f | 2332 | count++; |
9c83a661 SG |
2333 | } |
2334 | ||
ae22a220 ÇO |
2335 | if (wait_for_pid(pid) != 0) { |
2336 | for(i=0;i<count;i++) | |
2337 | free(addresses[i]); | |
2338 | free(addresses); | |
2339 | addresses = NULL; | |
2340 | } | |
9c83a661 | 2341 | |
ae22a220 ÇO |
2342 | /* close the read-end of the pipe */ |
2343 | close(pipefd[0]); | |
9c83a661 SG |
2344 | |
2345 | /* Append NULL to the array */ | |
9c88ff1f ÇO |
2346 | if(addresses) |
2347 | addresses = (char **)lxc_append_null_to_array((void **)addresses, count); | |
9c83a661 SG |
2348 | |
2349 | return addresses; | |
2350 | } | |
2351 | ||
858377e4 SH |
2352 | WRAP_API_3(char **, lxcapi_get_ips, const char *, const char *, int) |
2353 | ||
2354 | static int do_lxcapi_get_config_item(struct lxc_container *c, const char *key, char *retv, int inlen) | |
72d0e1cb | 2355 | { |
fce687aa CB |
2356 | int ret = -1; |
2357 | struct lxc_config_t *config; | |
72d0e1cb SG |
2358 | |
2359 | if (!c || !c->lxc_conf) | |
2360 | return -1; | |
fce687aa | 2361 | |
5cee8c50 | 2362 | if (container_mem_lock(c)) |
72d0e1cb | 2363 | return -1; |
fce687aa | 2364 | |
300df83e | 2365 | config = lxc_get_config(key); |
fce687aa CB |
2366 | /* Verify that the config key exists and that it has a callback |
2367 | * implemented. | |
2368 | */ | |
2369 | if (config && config->get) | |
cccd2219 | 2370 | ret = config->get(key, retv, inlen, c->lxc_conf, NULL); |
fce687aa | 2371 | |
5cee8c50 | 2372 | container_mem_unlock(c); |
72d0e1cb SG |
2373 | return ret; |
2374 | } | |
2375 | ||
858377e4 SH |
2376 | WRAP_API_3(int, lxcapi_get_config_item, const char *, char *, int) |
2377 | ||
2378 | static char* do_lxcapi_get_running_config_item(struct lxc_container *c, const char *key) | |
8ac18377 ÇO |
2379 | { |
2380 | char *ret; | |
2381 | ||
2382 | if (!c || !c->lxc_conf) | |
2383 | return NULL; | |
2384 | if (container_mem_lock(c)) | |
2385 | return NULL; | |
858377e4 | 2386 | ret = lxc_cmd_get_config_item(c->name, key, do_lxcapi_get_config_path(c)); |
8ac18377 ÇO |
2387 | container_mem_unlock(c); |
2388 | return ret; | |
2389 | } | |
2390 | ||
858377e4 SH |
2391 | WRAP_API_1(char *, lxcapi_get_running_config_item, const char *) |
2392 | ||
2393 | static int do_lxcapi_get_keys(struct lxc_container *c, const char *key, char *retv, int inlen) | |
72d0e1cb | 2394 | { |
300df83e CB |
2395 | int ret = -1; |
2396 | ||
2397 | /* List all config items. */ | |
72d0e1cb | 2398 | if (!key) |
cfc67626 | 2399 | return lxc_list_config_items(retv, inlen); |
300df83e | 2400 | |
72d0e1cb SG |
2401 | if (!c || !c->lxc_conf) |
2402 | return -1; | |
300df83e | 2403 | |
5cee8c50 | 2404 | if (container_mem_lock(c)) |
72d0e1cb | 2405 | return -1; |
300df83e CB |
2406 | |
2407 | /* Support 'lxc.net.<idx>', i.e. 'lxc.net.0' | |
2408 | * This is an intelligent result to show which keys are valid given the | |
2409 | * type of nic it is. | |
2410 | */ | |
6fba98b5 | 2411 | if (strncmp(key, "lxc.net.", 8) == 0) |
01f55c40 | 2412 | ret = lxc_list_net(c->lxc_conf, key, retv, inlen); |
fe9b7349 CB |
2413 | else |
2414 | ret = lxc_list_subkeys(c->lxc_conf, key, retv, inlen); | |
300df83e | 2415 | |
5cee8c50 | 2416 | container_mem_unlock(c); |
72d0e1cb SG |
2417 | return ret; |
2418 | } | |
2419 | ||
858377e4 SH |
2420 | WRAP_API_3(int, lxcapi_get_keys, const char *, char *, int) |
2421 | ||
2422 | static bool do_lxcapi_save_config(struct lxc_container *c, const char *alt_file) | |
72d0e1cb | 2423 | { |
0e1a60b0 | 2424 | int fd, lret; |
39dc698c | 2425 | bool ret = false, need_disklock = false; |
39dc698c | 2426 | |
72d0e1cb SG |
2427 | if (!alt_file) |
2428 | alt_file = c->configfile; | |
2429 | if (!alt_file) | |
1a0e70ac | 2430 | return false; |
39dc698c | 2431 | |
1a0e70ac | 2432 | /* If we haven't yet loaded a config, load the stock config. */ |
39dc698c | 2433 | if (!c->lxc_conf) { |
858377e4 | 2434 | if (!do_lxcapi_load_config(c, lxc_global_config_value("lxc.default_config"))) { |
0e1a60b0 CB |
2435 | ERROR("Error loading default configuration file %s " |
2436 | "while saving %s", | |
2437 | lxc_global_config_value("lxc.default_config"), | |
2438 | c->name); | |
72d0e1cb SG |
2439 | return false; |
2440 | } | |
39dc698c | 2441 | } |
72d0e1cb | 2442 | |
5a3d2e1e SG |
2443 | if (!create_container_dir(c)) |
2444 | return false; | |
2445 | ||
1a0e70ac CB |
2446 | /* If we're writing to the container's config file, take the disk lock. |
2447 | * Otherwise just take the memlock to protect the struct lxc_container | |
2448 | * while we're traversing it. | |
39dc698c SH |
2449 | */ |
2450 | if (strcmp(c->configfile, alt_file) == 0) | |
2451 | need_disklock = true; | |
2452 | ||
2453 | if (need_disklock) | |
2454 | lret = container_disk_lock(c); | |
2455 | else | |
2456 | lret = container_mem_lock(c); | |
2457 | ||
2458 | if (lret) | |
72d0e1cb | 2459 | return false; |
39dc698c | 2460 | |
0e1a60b0 CB |
2461 | fd = open(alt_file, O_WRONLY | O_CREAT | O_CLOEXEC, |
2462 | S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH); | |
2463 | if (fd < 0) | |
2464 | goto on_error; | |
2465 | ||
2466 | lret = write_config(fd, c->lxc_conf); | |
2467 | close(fd); | |
2468 | if (lret < 0) | |
2469 | goto on_error; | |
2470 | ||
39dc698c SH |
2471 | ret = true; |
2472 | ||
0e1a60b0 | 2473 | on_error: |
39dc698c SH |
2474 | if (need_disklock) |
2475 | container_disk_unlock(c); | |
2476 | else | |
2477 | container_mem_unlock(c); | |
0e1a60b0 | 2478 | |
39dc698c | 2479 | return ret; |
72d0e1cb SG |
2480 | } |
2481 | ||
858377e4 SH |
2482 | WRAP_API_1(bool, lxcapi_save_config, const char *) |
2483 | ||
0ea055b3 CB |
2484 | |
2485 | static bool mod_rdep(struct lxc_container *c0, struct lxc_container *c, bool inc) | |
dfb31b25 | 2486 | { |
0ea055b3 CB |
2487 | FILE *f1; |
2488 | struct stat fbuf; | |
42342bed CB |
2489 | void *buf = NULL; |
2490 | char *del = NULL; | |
dfb31b25 | 2491 | char path[MAXPATHLEN]; |
0ea055b3 CB |
2492 | char newpath[MAXPATHLEN]; |
2493 | int fd, ret, n = 0, v = 0; | |
dfb31b25 | 2494 | bool bret = false; |
42342bed | 2495 | size_t len = 0, bytes = 0; |
dfb31b25 | 2496 | |
0ea055b3 | 2497 | if (container_disk_lock(c0)) |
dfb31b25 | 2498 | return false; |
0ea055b3 CB |
2499 | |
2500 | ret = snprintf(path, MAXPATHLEN, "%s/%s/lxc_snapshots", c0->config_path, c0->name); | |
dfb31b25 SH |
2501 | if (ret < 0 || ret > MAXPATHLEN) |
2502 | goto out; | |
0ea055b3 CB |
2503 | ret = snprintf(newpath, MAXPATHLEN, "%s\n%s\n", c->config_path, c->name); |
2504 | if (ret < 0 || ret > MAXPATHLEN) | |
dfb31b25 | 2505 | goto out; |
0ea055b3 CB |
2506 | |
2507 | /* If we find an lxc-snapshot file using the old format only listing the | |
2508 | * number of snapshots we will keep using it. */ | |
2509 | f1 = fopen(path, "r"); | |
2510 | if (f1) { | |
2511 | n = fscanf(f1, "%d", &v); | |
2512 | fclose(f1); | |
2513 | if (n == 1 && v == 0) { | |
2514 | remove(path); | |
2515 | n = 0; | |
2516 | } | |
dfb31b25 | 2517 | } |
0ea055b3 CB |
2518 | if (n == 1) { |
2519 | v += inc ? 1 : -1; | |
2520 | f1 = fopen(path, "w"); | |
2521 | if (!f1) | |
2522 | goto out; | |
2523 | if (fprintf(f1, "%d\n", v) < 0) { | |
2524 | ERROR("Error writing new snapshots value"); | |
2525 | fclose(f1); | |
2526 | goto out; | |
2527 | } | |
2528 | ret = fclose(f1); | |
2529 | if (ret != 0) { | |
2530 | SYSERROR("Error writing to or closing snapshots file"); | |
2531 | goto out; | |
2532 | } | |
2533 | } else { | |
2534 | /* Here we know that we have or can use an lxc-snapshot file | |
2535 | * using the new format. */ | |
2536 | if (inc) { | |
2537 | f1 = fopen(path, "a"); | |
2538 | if (!f1) | |
2539 | goto out; | |
2540 | ||
2541 | if (fprintf(f1, "%s", newpath) < 0) { | |
2542 | ERROR("Error writing new snapshots entry"); | |
2543 | ret = fclose(f1); | |
2544 | if (ret != 0) | |
2545 | SYSERROR("Error writing to or closing snapshots file"); | |
2546 | goto out; | |
2547 | } | |
2548 | ||
2549 | ret = fclose(f1); | |
2550 | if (ret != 0) { | |
2551 | SYSERROR("Error writing to or closing snapshots file"); | |
2552 | goto out; | |
2553 | } | |
2554 | } else if (!inc) { | |
d028235d SG |
2555 | if ((fd = open(path, O_RDWR | O_CLOEXEC)) < 0) |
2556 | goto out; | |
2557 | ||
2558 | if (fstat(fd, &fbuf) < 0) { | |
2559 | close(fd); | |
2560 | goto out; | |
2561 | } | |
2562 | ||
2563 | if (fbuf.st_size != 0) { | |
d028235d | 2564 | |
25086a5f | 2565 | buf = lxc_strmmap(NULL, fbuf.st_size, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0); |
d028235d SG |
2566 | if (buf == MAP_FAILED) { |
2567 | SYSERROR("Failed to create mapping %s", path); | |
2568 | close(fd); | |
2569 | goto out; | |
2570 | } | |
2571 | ||
2572 | len = strlen(newpath); | |
2573 | while ((del = strstr((char *)buf, newpath))) { | |
2574 | memmove(del, del + len, strlen(del) - len + 1); | |
2575 | bytes += len; | |
2576 | } | |
2577 | ||
25086a5f | 2578 | lxc_strmunmap(buf, fbuf.st_size); |
d028235d SG |
2579 | if (ftruncate(fd, fbuf.st_size - bytes) < 0) { |
2580 | SYSERROR("Failed to truncate file %s", path); | |
2581 | close(fd); | |
2582 | goto out; | |
2583 | } | |
2584 | } | |
2585 | close(fd); | |
2586 | } | |
0ea055b3 CB |
2587 | |
2588 | /* If the lxc-snapshot file is empty, remove it. */ | |
2589 | if (stat(path, &fbuf) < 0) | |
2590 | goto out; | |
d028235d SG |
2591 | if (!fbuf.st_size) { |
2592 | remove(path); | |
0ea055b3 | 2593 | } |
dfb31b25 SH |
2594 | } |
2595 | ||
2596 | bret = true; | |
2597 | ||
2598 | out: | |
0ea055b3 | 2599 | container_disk_unlock(c0); |
dfb31b25 SH |
2600 | return bret; |
2601 | } | |
2602 | ||
2603 | static void strip_newline(char *p) | |
2604 | { | |
2605 | size_t len = strlen(p); | |
2606 | if (len < 1) | |
2607 | return; | |
2608 | if (p[len-1] == '\n') | |
2609 | p[len-1] = '\0'; | |
2610 | } | |
2611 | ||
d825fff3 | 2612 | void mod_all_rdeps(struct lxc_container *c, bool inc) |
dfb31b25 SH |
2613 | { |
2614 | struct lxc_container *p; | |
2615 | char *lxcpath = NULL, *lxcname = NULL, path[MAXPATHLEN]; | |
2616 | size_t pathlen = 0, namelen = 0; | |
2617 | FILE *f; | |
2618 | int ret; | |
2619 | ||
2620 | ret = snprintf(path, MAXPATHLEN, "%s/%s/lxc_rdepends", | |
2621 | c->config_path, c->name); | |
2622 | if (ret < 0 || ret >= MAXPATHLEN) { | |
2623 | ERROR("Path name too long"); | |
2624 | return; | |
2625 | } | |
025ed0f3 | 2626 | f = fopen(path, "r"); |
025ed0f3 | 2627 | if (f == NULL) |
dfb31b25 SH |
2628 | return; |
2629 | while (getline(&lxcpath, &pathlen, f) != -1) { | |
2630 | if (getline(&lxcname, &namelen, f) == -1) { | |
959aee9c | 2631 | ERROR("badly formatted file %s", path); |
dfb31b25 SH |
2632 | goto out; |
2633 | } | |
2634 | strip_newline(lxcpath); | |
2635 | strip_newline(lxcname); | |
2636 | if ((p = lxc_container_new(lxcname, lxcpath)) == NULL) { | |
2637 | ERROR("Unable to find dependent container %s:%s", | |
2638 | lxcpath, lxcname); | |
2639 | continue; | |
2640 | } | |
0ea055b3 CB |
2641 | if (!mod_rdep(p, c, inc)) |
2642 | ERROR("Failed to update snapshots file for %s:%s", | |
dfb31b25 SH |
2643 | lxcpath, lxcname); |
2644 | lxc_container_put(p); | |
2645 | } | |
2646 | out: | |
f10fad2f ME |
2647 | free(lxcpath); |
2648 | free(lxcname); | |
dfb31b25 SH |
2649 | fclose(f); |
2650 | } | |
2651 | ||
18aa217b | 2652 | static bool has_fs_snapshots(struct lxc_container *c) |
dfb31b25 | 2653 | { |
0ea055b3 | 2654 | FILE *f; |
dfb31b25 SH |
2655 | char path[MAXPATHLEN]; |
2656 | int ret, v; | |
0ea055b3 | 2657 | struct stat fbuf; |
dfb31b25 SH |
2658 | bool bret = false; |
2659 | ||
2660 | ret = snprintf(path, MAXPATHLEN, "%s/%s/lxc_snapshots", c->config_path, | |
2661 | c->name); | |
2662 | if (ret < 0 || ret > MAXPATHLEN) | |
2663 | goto out; | |
0ea055b3 CB |
2664 | /* If the file doesn't exist there are no snapshots. */ |
2665 | if (stat(path, &fbuf) < 0) | |
dfb31b25 | 2666 | goto out; |
0ea055b3 CB |
2667 | v = fbuf.st_size; |
2668 | if (v != 0) { | |
2669 | f = fopen(path, "r"); | |
2670 | if (!f) | |
2671 | goto out; | |
2672 | ret = fscanf(f, "%d", &v); | |
2673 | fclose(f); | |
1a0e70ac | 2674 | /* TODO: Figure out what to do with the return value of fscanf. */ |
0ea055b3 CB |
2675 | if (ret != 1) |
2676 | INFO("Container uses new lxc-snapshots format %s", path); | |
2677 | } | |
dfb31b25 SH |
2678 | bret = v != 0; |
2679 | ||
2680 | out: | |
2681 | return bret; | |
2682 | } | |
2683 | ||
18aa217b SH |
2684 | static bool has_snapshots(struct lxc_container *c) |
2685 | { | |
2686 | char path[MAXPATHLEN]; | |
74f96976 | 2687 | struct dirent *direntp; |
18aa217b SH |
2688 | int count=0; |
2689 | DIR *dir; | |
2690 | ||
2691 | if (!get_snappath_dir(c, path)) | |
2692 | return false; | |
2693 | dir = opendir(path); | |
2694 | if (!dir) | |
2695 | return false; | |
74f96976 | 2696 | while ((direntp = readdir(dir))) { |
18aa217b SH |
2697 | if (!direntp) |
2698 | break; | |
2699 | ||
2700 | if (!strcmp(direntp->d_name, ".")) | |
2701 | continue; | |
2702 | ||
2703 | if (!strcmp(direntp->d_name, "..")) | |
2704 | continue; | |
2705 | count++; | |
2706 | break; | |
2707 | } | |
2708 | closedir(dir); | |
2709 | return count > 0; | |
2710 | } | |
2711 | ||
297c2d58 | 2712 | static bool do_destroy_container(struct lxc_conf *conf) { |
ee484f7f CB |
2713 | int ret; |
2714 | ||
e0010464 | 2715 | if (am_guest_unpriv()) { |
ee484f7f CB |
2716 | ret = userns_exec_full(conf, storage_destroy_wrapper, conf, |
2717 | "storage_destroy_wrapper"); | |
2718 | if (ret < 0) | |
d028235d | 2719 | return false; |
ee484f7f | 2720 | |
d028235d SG |
2721 | return true; |
2722 | } | |
ee484f7f | 2723 | |
10bc1861 | 2724 | return storage_destroy(conf); |
297c2d58 CB |
2725 | } |
2726 | ||
4355ab5f SH |
2727 | static int lxc_rmdir_onedev_wrapper(void *data) |
2728 | { | |
2729 | char *arg = (char *) data; | |
18aa217b | 2730 | return lxc_rmdir_onedev(arg, "snaps"); |
4355ab5f SH |
2731 | } |
2732 | ||
17a367d8 | 2733 | static int lxc_unlink_exec_wrapper(void *data) |
72d0e1cb | 2734 | { |
17a367d8 CB |
2735 | char *arg = data; |
2736 | return unlink(arg); | |
2737 | } | |
2738 | ||
2739 | static bool container_destroy(struct lxc_container *c, | |
2740 | struct lxc_storage *storage) | |
2741 | { | |
2742 | const char *p1; | |
2743 | size_t len; | |
2744 | struct lxc_conf *conf; | |
2745 | char *path = NULL; | |
c868b261 | 2746 | bool bret = false; |
297c2d58 | 2747 | int ret = 0; |
72d0e1cb | 2748 | |
858377e4 | 2749 | if (!c || !do_lxcapi_is_defined(c)) |
5a3d2e1e SG |
2750 | return false; |
2751 | ||
a70a69e8 | 2752 | conf = c->lxc_conf; |
3bc449ed | 2753 | if (container_disk_lock(c)) |
72d0e1cb | 2754 | return false; |
72d0e1cb | 2755 | |
39dc698c | 2756 | if (!is_stopped(c)) { |
1a0e70ac | 2757 | /* We should queue some sort of error - in c->error_string? */ |
60bf62d4 SH |
2758 | ERROR("container %s is not stopped", c->name); |
2759 | goto out; | |
72d0e1cb SG |
2760 | } |
2761 | ||
a70a69e8 | 2762 | if (conf && !lxc_list_empty(&conf->hooks[LXCHOOK_DESTROY])) { |
37cf711b | 2763 | /* Start of environment variable setup for hooks */ |
cb8ff4d0 | 2764 | if (setenv("LXC_NAME", c->name, 1)) |
17a367d8 CB |
2765 | SYSERROR("Failed to set environment variable for container name"); |
2766 | ||
2767 | if (conf->rcfile && setenv("LXC_CONFIG_FILE", conf->rcfile, 1)) | |
2768 | SYSERROR("Failed to set environment variable for config path"); | |
2769 | ||
2770 | if (conf->rootfs.mount && setenv("LXC_ROOTFS_MOUNT", conf->rootfs.mount, 1)) | |
2771 | SYSERROR("Failed to set environment variable for rootfs mount"); | |
2772 | ||
2773 | if (conf->rootfs.path && setenv("LXC_ROOTFS_PATH", conf->rootfs.path, 1)) | |
2774 | SYSERROR("Failed to set environment variable for rootfs mount"); | |
2775 | ||
2776 | if (conf->console.path && setenv("LXC_CONSOLE", conf->console.path, 1)) | |
2777 | SYSERROR("Failed to set environment variable for console path"); | |
2778 | ||
2779 | if (conf->console.log_path && setenv("LXC_CONSOLE_LOGPATH", conf->console.log_path, 1)) | |
2780 | SYSERROR("Failed to set environment variable for console log"); | |
37cf711b SY |
2781 | /* End of environment variable setup for hooks */ |
2782 | ||
14a7b0f9 | 2783 | if (run_lxc_hooks(c->name, "destroy", conf, NULL)) { |
17a367d8 | 2784 | ERROR("Failed to execute clone hook for \"%s\"", c->name); |
37cf711b SY |
2785 | goto out; |
2786 | } | |
2787 | } | |
2788 | ||
2789 | if (current_config && conf == current_config) { | |
858377e4 | 2790 | current_config = NULL; |
37cf711b SY |
2791 | if (conf->logfd != -1) { |
2792 | close(conf->logfd); | |
2793 | conf->logfd = -1; | |
858377e4 SH |
2794 | } |
2795 | } | |
2796 | ||
d028235d SG |
2797 | if (conf && conf->rootfs.path && conf->rootfs.mount) { |
2798 | if (!do_destroy_container(conf)) { | |
2799 | ERROR("Error destroying rootfs for %s", c->name); | |
2800 | goto out; | |
2801 | } | |
2802 | INFO("Destroyed rootfs for %s", c->name); | |
2803 | } | |
60bf62d4 | 2804 | |
dfb31b25 SH |
2805 | mod_all_rdeps(c, false); |
2806 | ||
17a367d8 CB |
2807 | p1 = do_lxcapi_get_config_path(c); |
2808 | /* strlen(p1) | |
2809 | * + | |
2810 | * / | |
2811 | * + | |
2812 | * strlen(c->name) | |
2813 | * + | |
2814 | * / | |
2815 | * + | |
2816 | * strlen("config") = 6 | |
2817 | * + | |
2818 | * \0 | |
2819 | */ | |
2820 | len = strlen(p1) + 1 + strlen(c->name) + 1 + 6 + 1; | |
2821 | path = malloc(len); | |
2822 | if (!path) { | |
2823 | ERROR("Failed to allocate memory"); | |
2824 | goto out; | |
2825 | } | |
2826 | ||
2827 | /* For an overlay container the rootfs is considered immutable and | |
2828 | * cannot be removed when restoring from a snapshot. | |
2829 | */ | |
2830 | if (storage && (!strcmp(storage->type, "overlay") || | |
2831 | !strcmp(storage->type, "overlayfs")) && | |
2832 | (storage->flags & LXC_STORAGE_INTERNAL_OVERLAY_RESTORE)) { | |
2833 | ret = snprintf(path, len, "%s/%s/config", p1, c->name); | |
2834 | if (ret < 0 || (size_t)ret >= len) | |
2835 | goto out; | |
2836 | ||
e0010464 | 2837 | if (am_guest_unpriv()) |
17a367d8 CB |
2838 | ret = userns_exec_1(conf, lxc_unlink_exec_wrapper, path, |
2839 | "lxc_unlink_exec_wrapper"); | |
2840 | else | |
2841 | ret = unlink(path); | |
2842 | if (ret < 0) { | |
2843 | SYSERROR("Failed to destroy config file \"%s\" for \"%s\"", | |
2844 | path, c->name); | |
2845 | goto out; | |
2846 | } | |
2847 | INFO("Destroyed config file \"%s\" for \"%s\"", path, c->name); | |
2848 | ||
2849 | bret = true; | |
2850 | goto out; | |
2851 | } | |
2852 | ||
2853 | ret = snprintf(path, len, "%s/%s", p1, c->name); | |
2854 | if (ret < 0 || (size_t)ret >= len) | |
2855 | goto out; | |
e0010464 | 2856 | if (am_guest_unpriv()) |
ee484f7f CB |
2857 | ret = userns_exec_full(conf, lxc_rmdir_onedev_wrapper, path, |
2858 | "lxc_rmdir_onedev_wrapper"); | |
4355ab5f | 2859 | else |
18aa217b | 2860 | ret = lxc_rmdir_onedev(path, "snaps"); |
4355ab5f | 2861 | if (ret < 0) { |
17a367d8 CB |
2862 | ERROR("Failed to destroy directory \"%s\" for \"%s\"", path, |
2863 | c->name); | |
60bf62d4 SH |
2864 | goto out; |
2865 | } | |
17a367d8 | 2866 | INFO("Destroyed directory \"%s\" for \"%s\"", path, c->name); |
297c2d58 | 2867 | |
fef48dc9 | 2868 | bret = true; |
60bf62d4 SH |
2869 | |
2870 | out: | |
17a367d8 CB |
2871 | if (path) |
2872 | free(path); | |
3bc449ed | 2873 | container_disk_unlock(c); |
fef48dc9 | 2874 | return bret; |
72d0e1cb SG |
2875 | } |
2876 | ||
858377e4 | 2877 | static bool do_lxcapi_destroy(struct lxc_container *c) |
18aa217b SH |
2878 | { |
2879 | if (!c || !lxcapi_is_defined(c)) | |
2880 | return false; | |
2881 | if (has_snapshots(c)) { | |
2882 | ERROR("Container %s has snapshots; not removing", c->name); | |
2883 | return false; | |
2884 | } | |
2885 | ||
2886 | if (has_fs_snapshots(c)) { | |
2887 | ERROR("container %s has snapshots on its rootfs", c->name); | |
2888 | return false; | |
2889 | } | |
2890 | ||
17a367d8 | 2891 | return container_destroy(c, NULL); |
18aa217b SH |
2892 | } |
2893 | ||
858377e4 | 2894 | WRAP_API(bool, lxcapi_destroy) |
18aa217b | 2895 | |
858377e4 | 2896 | static bool do_lxcapi_destroy_with_snapshots(struct lxc_container *c) |
18aa217b SH |
2897 | { |
2898 | if (!c || !lxcapi_is_defined(c)) | |
2899 | return false; | |
2900 | if (!lxcapi_snapshot_destroy_all(c)) { | |
2901 | ERROR("Error deleting all snapshots"); | |
2902 | return false; | |
2903 | } | |
2904 | return lxcapi_destroy(c); | |
2905 | } | |
2906 | ||
858377e4 SH |
2907 | WRAP_API(bool, lxcapi_destroy_with_snapshots) |
2908 | ||
0d9cd9c3 CB |
2909 | int lxc_set_config_item_locked(struct lxc_conf *conf, const char *key, |
2910 | const char *v) | |
96532523 | 2911 | { |
0d9cd9c3 | 2912 | int ret; |
96532523 | 2913 | struct lxc_config_t *config; |
0d9cd9c3 CB |
2914 | bool bret = true; |
2915 | ||
2916 | config = lxc_get_config(key); | |
2917 | if (!config) | |
2918 | return -EINVAL; | |
2919 | ||
2920 | ret = config->set(key, v, conf, NULL); | |
2921 | if (ret < 0) | |
2922 | return -EINVAL; | |
2923 | ||
2924 | if (lxc_config_value_empty(v)) | |
2925 | do_clear_unexp_config_line(conf, key); | |
2926 | else | |
2927 | bret = do_append_unexp_config_line(conf, key, v); | |
2928 | if (!bret) | |
2929 | return -ENOMEM; | |
2930 | ||
2931 | return 0; | |
2932 | } | |
2933 | ||
2934 | static bool do_set_config_item_locked(struct lxc_container *c, const char *key, | |
2935 | const char *v) | |
2936 | { | |
2937 | int ret; | |
96532523 SH |
2938 | |
2939 | if (!c->lxc_conf) | |
2940 | c->lxc_conf = lxc_conf_init(); | |
4222a9f4 | 2941 | |
6b0d5538 | 2942 | if (!c->lxc_conf) |
96532523 | 2943 | return false; |
4222a9f4 | 2944 | |
0d9cd9c3 CB |
2945 | ret = lxc_set_config_item_locked(c->lxc_conf, key, v); |
2946 | if (ret < 0) | |
f979ac15 | 2947 | return false; |
4222a9f4 | 2948 | |
0d9cd9c3 | 2949 | return true; |
96532523 SH |
2950 | } |
2951 | ||
858377e4 | 2952 | static bool do_lxcapi_set_config_item(struct lxc_container *c, const char *key, const char *v) |
72d0e1cb | 2953 | { |
72d0e1cb | 2954 | bool b = false; |
72d0e1cb SG |
2955 | |
2956 | if (!c) | |
2957 | return false; | |
2958 | ||
5cee8c50 | 2959 | if (container_mem_lock(c)) |
72d0e1cb SG |
2960 | return false; |
2961 | ||
0d9cd9c3 | 2962 | b = do_set_config_item_locked(c, key, v); |
72d0e1cb | 2963 | |
5cee8c50 | 2964 | container_mem_unlock(c); |
72d0e1cb SG |
2965 | return b; |
2966 | } | |
2967 | ||
858377e4 SH |
2968 | WRAP_API_2(bool, lxcapi_set_config_item, const char *, const char *) |
2969 | ||
72d0e1cb SG |
2970 | static char *lxcapi_config_file_name(struct lxc_container *c) |
2971 | { | |
2972 | if (!c || !c->configfile) | |
2973 | return NULL; | |
2974 | return strdup(c->configfile); | |
2975 | } | |
2976 | ||
2a59a681 SH |
2977 | static const char *lxcapi_get_config_path(struct lxc_container *c) |
2978 | { | |
2979 | if (!c || !c->config_path) | |
2980 | return NULL; | |
2981 | return (const char *)(c->config_path); | |
2982 | } | |
2983 | ||
afeecbba SH |
2984 | /* |
2985 | * not for export | |
2986 | * Just recalculate the c->configfile based on the | |
2987 | * c->config_path, which must be set. | |
2988 | * The lxc_container must be locked or not yet public. | |
2989 | */ | |
2990 | static bool set_config_filename(struct lxc_container *c) | |
2991 | { | |
2992 | char *newpath; | |
2993 | int len, ret; | |
2994 | ||
2995 | if (!c->config_path) | |
2996 | return false; | |
2997 | ||
2998 | /* $lxc_path + "/" + c->name + "/" + "config" + '\0' */ | |
2999 | len = strlen(c->config_path) + strlen(c->name) + strlen("config") + 3; | |
3000 | newpath = malloc(len); | |
3001 | if (!newpath) | |
3002 | return false; | |
3003 | ||
3004 | ret = snprintf(newpath, len, "%s/%s/config", c->config_path, c->name); | |
3005 | if (ret < 0 || ret >= len) { | |
3006 | fprintf(stderr, "Error printing out config file name\n"); | |
3007 | free(newpath); | |
3008 | return false; | |
3009 | } | |
3010 | ||
f10fad2f | 3011 | free(c->configfile); |
afeecbba SH |
3012 | c->configfile = newpath; |
3013 | ||
3014 | return true; | |
3015 | } | |
3016 | ||
858377e4 | 3017 | static bool do_lxcapi_set_config_path(struct lxc_container *c, const char *path) |
2a59a681 SH |
3018 | { |
3019 | char *p; | |
3020 | bool b = false; | |
afeecbba | 3021 | char *oldpath = NULL; |
2a59a681 SH |
3022 | |
3023 | if (!c) | |
3024 | return b; | |
3025 | ||
5cee8c50 | 3026 | if (container_mem_lock(c)) |
2a59a681 SH |
3027 | return b; |
3028 | ||
3029 | p = strdup(path); | |
afeecbba SH |
3030 | if (!p) { |
3031 | ERROR("Out of memory setting new lxc path"); | |
2a59a681 | 3032 | goto err; |
afeecbba SH |
3033 | } |
3034 | ||
2a59a681 SH |
3035 | b = true; |
3036 | if (c->config_path) | |
afeecbba | 3037 | oldpath = c->config_path; |
2a59a681 | 3038 | c->config_path = p; |
afeecbba SH |
3039 | |
3040 | /* Since we've changed the config path, we have to change the | |
3041 | * config file name too */ | |
3042 | if (!set_config_filename(c)) { | |
3043 | ERROR("Out of memory setting new config filename"); | |
3044 | b = false; | |
3045 | free(c->config_path); | |
3046 | c->config_path = oldpath; | |
3047 | oldpath = NULL; | |
3048 | } | |
2a59a681 | 3049 | err: |
f10fad2f | 3050 | free(oldpath); |
5cee8c50 | 3051 | container_mem_unlock(c); |
2a59a681 SH |
3052 | return b; |
3053 | } | |
3054 | ||
858377e4 | 3055 | WRAP_API_1(bool, lxcapi_set_config_path, const char *) |
2a59a681 | 3056 | |
858377e4 | 3057 | static bool do_lxcapi_set_cgroup_item(struct lxc_container *c, const char *subsys, const char *value) |
794dd120 SH |
3058 | { |
3059 | int ret; | |
794dd120 SH |
3060 | |
3061 | if (!c) | |
3062 | return false; | |
3063 | ||
3bc449ed | 3064 | if (is_stopped(c)) |
794dd120 SH |
3065 | return false; |
3066 | ||
3bc449ed SH |
3067 | if (container_disk_lock(c)) |
3068 | return false; | |
794dd120 | 3069 | |
33ad9f1a | 3070 | ret = lxc_cgroup_set(subsys, value, c->name, c->config_path); |
3bc449ed SH |
3071 | |
3072 | container_disk_unlock(c); | |
3073 | return ret == 0; | |
794dd120 SH |
3074 | } |
3075 | ||
858377e4 SH |
3076 | WRAP_API_2(bool, lxcapi_set_cgroup_item, const char *, const char *) |
3077 | ||
3078 | static int do_lxcapi_get_cgroup_item(struct lxc_container *c, const char *subsys, char *retv, int inlen) | |
794dd120 | 3079 | { |
3bc449ed | 3080 | int ret; |
794dd120 | 3081 | |
6502006a | 3082 | if (!c) |
794dd120 SH |
3083 | return -1; |
3084 | ||
3bc449ed | 3085 | if (is_stopped(c)) |
794dd120 SH |
3086 | return -1; |
3087 | ||
3bc449ed SH |
3088 | if (container_disk_lock(c)) |
3089 | return -1; | |
794dd120 | 3090 | |
33ad9f1a | 3091 | ret = lxc_cgroup_get(subsys, retv, inlen, c->name, c->config_path); |
794dd120 | 3092 | |
3bc449ed | 3093 | container_disk_unlock(c); |
794dd120 SH |
3094 | return ret; |
3095 | } | |
3096 | ||
858377e4 SH |
3097 | WRAP_API_3(int, lxcapi_get_cgroup_item, const char *, char *, int) |
3098 | ||
593e8478 | 3099 | const char *lxc_get_global_config_item(const char *key) |
83c98d82 | 3100 | { |
593e8478 | 3101 | return lxc_global_config_value(key); |
a8428dfa SH |
3102 | } |
3103 | ||
b6b918a1 SG |
3104 | const char *lxc_get_version(void) |
3105 | { | |
95ee490b | 3106 | return LXC_VERSION; |
b6b918a1 SG |
3107 | } |
3108 | ||
f0ca2726 | 3109 | static int copy_file(const char *old, const char *new) |
9be53773 SH |
3110 | { |
3111 | int in, out; | |
3112 | ssize_t len, ret; | |
3113 | char buf[8096]; | |
3114 | struct stat sbuf; | |
3115 | ||
3116 | if (file_exists(new)) { | |
3117 | ERROR("copy destination %s exists", new); | |
3118 | return -1; | |
3119 | } | |
3120 | ret = stat(old, &sbuf); | |
3121 | if (ret < 0) { | |
dfb31b25 | 3122 | INFO("Error stat'ing %s", old); |
9be53773 SH |
3123 | return -1; |
3124 | } | |
3125 | ||
3126 | in = open(old, O_RDONLY); | |
3127 | if (in < 0) { | |
dfb31b25 | 3128 | SYSERROR("Error opening original file %s", old); |
9be53773 SH |
3129 | return -1; |
3130 | } | |
3131 | out = open(new, O_CREAT | O_EXCL | O_WRONLY, 0644); | |
3132 | if (out < 0) { | |
dfb31b25 | 3133 | SYSERROR("Error opening new file %s", new); |
9be53773 SH |
3134 | close(in); |
3135 | return -1; | |
3136 | } | |
3137 | ||
3138 | while (1) { | |
3139 | len = read(in, buf, 8096); | |
3140 | if (len < 0) { | |
dfb31b25 | 3141 | SYSERROR("Error reading old file %s", old); |
9be53773 SH |
3142 | goto err; |
3143 | } | |
3144 | if (len == 0) | |
3145 | break; | |
3146 | ret = write(out, buf, len); | |
1a0e70ac | 3147 | if (ret < len) { /* should we retry? */ |
dfb31b25 | 3148 | SYSERROR("Error: write to new file %s was interrupted", new); |
9be53773 SH |
3149 | goto err; |
3150 | } | |
3151 | } | |
3152 | close(in); | |
3153 | close(out); | |
3154 | ||
1a0e70ac | 3155 | /* We set mode, but not owner/group. */ |
9be53773 SH |
3156 | ret = chmod(new, sbuf.st_mode); |
3157 | if (ret) { | |
dfb31b25 | 3158 | SYSERROR("Error setting mode on %s", new); |
9be53773 SH |
3159 | return -1; |
3160 | } | |
3161 | ||
3162 | return 0; | |
3163 | ||
3164 | err: | |
3165 | close(in); | |
3166 | close(out); | |
3167 | return -1; | |
3168 | } | |
3169 | ||
9be53773 SH |
3170 | static int copyhooks(struct lxc_container *oldc, struct lxc_container *c) |
3171 | { | |
619256b5 | 3172 | int i, len, ret; |
9be53773 | 3173 | struct lxc_list *it; |
619256b5 ÇO |
3174 | char *cpath; |
3175 | ||
3176 | len = strlen(oldc->config_path) + strlen(oldc->name) + 3; | |
3177 | cpath = alloca(len); | |
3178 | ret = snprintf(cpath, len, "%s/%s/", oldc->config_path, oldc->name); | |
3179 | if (ret < 0 || ret >= len) | |
3180 | return -1; | |
9be53773 SH |
3181 | |
3182 | for (i=0; i<NUM_LXC_HOOKS; i++) { | |
3183 | lxc_list_for_each(it, &c->lxc_conf->hooks[i]) { | |
3184 | char *hookname = it->elem; | |
c32981c3 | 3185 | char *fname = strrchr(hookname, '/'); |
9be53773 | 3186 | char tmppath[MAXPATHLEN]; |
1a0e70ac | 3187 | if (!fname) /* relative path - we don't support, but maybe we should */ |
9be53773 | 3188 | return 0; |
619256b5 | 3189 | if (strncmp(hookname, cpath, len - 1) != 0) { |
1a0e70ac | 3190 | /* this hook is public - ignore */ |
619256b5 ÇO |
3191 | continue; |
3192 | } | |
1a0e70ac | 3193 | /* copy the script, and change the entry in confile */ |
9be53773 SH |
3194 | ret = snprintf(tmppath, MAXPATHLEN, "%s/%s/%s", |
3195 | c->config_path, c->name, fname+1); | |
3196 | if (ret < 0 || ret >= MAXPATHLEN) | |
3197 | return -1; | |
3198 | ret = copy_file(it->elem, tmppath); | |
3199 | if (ret < 0) | |
3200 | return -1; | |
3201 | free(it->elem); | |
3202 | it->elem = strdup(tmppath); | |
3203 | if (!it->elem) { | |
3204 | ERROR("out of memory copying hook path"); | |
3205 | return -1; | |
3206 | } | |
9be53773 SH |
3207 | } |
3208 | } | |
3209 | ||
67702c21 SH |
3210 | if (!clone_update_unexp_hooks(c->lxc_conf, oldc->config_path, |
3211 | c->config_path, oldc->name, c->name)) { | |
6b0d5538 SH |
3212 | ERROR("Error saving new hooks in clone"); |
3213 | return -1; | |
3214 | } | |
858377e4 | 3215 | do_lxcapi_save_config(c, NULL); |
9be53773 SH |
3216 | return 0; |
3217 | } | |
3218 | ||
9be53773 SH |
3219 | |
3220 | static int copy_fstab(struct lxc_container *oldc, struct lxc_container *c) | |
3221 | { | |
3222 | char newpath[MAXPATHLEN]; | |
3223 | char *oldpath = oldc->lxc_conf->fstab; | |
3224 | int ret; | |
3225 | ||
3226 | if (!oldpath) | |
3227 | return 0; | |
3228 | ||
47148e96 CB |
3229 | clear_unexp_config_line(c->lxc_conf, "lxc.mount.fstab", false); |
3230 | ||
c32981c3 | 3231 | char *p = strrchr(oldpath, '/'); |
9be53773 SH |
3232 | if (!p) |
3233 | return -1; | |
3234 | ret = snprintf(newpath, MAXPATHLEN, "%s/%s%s", | |
3235 | c->config_path, c->name, p); | |
3236 | if (ret < 0 || ret >= MAXPATHLEN) { | |
3237 | ERROR("error printing new path for %s", oldpath); | |
3238 | return -1; | |
3239 | } | |
3240 | if (file_exists(newpath)) { | |
3241 | ERROR("error: fstab file %s exists", newpath); | |
3242 | return -1; | |
3243 | } | |
3244 | ||
3245 | if (copy_file(oldpath, newpath) < 0) { | |
3246 | ERROR("error: copying %s to %s", oldpath, newpath); | |
3247 | return -1; | |
3248 | } | |
3249 | free(c->lxc_conf->fstab); | |
3250 | c->lxc_conf->fstab = strdup(newpath); | |
3251 | if (!c->lxc_conf->fstab) { | |
3252 | ERROR("error: allocating pathname"); | |
3253 | return -1; | |
3254 | } | |
47148e96 | 3255 | if (!do_append_unexp_config_line(c->lxc_conf, "lxc.mount.fstab", newpath)) { |
6b0d5538 SH |
3256 | ERROR("error saving new lxctab"); |
3257 | return -1; | |
3258 | } | |
9be53773 SH |
3259 | |
3260 | return 0; | |
3261 | } | |
3262 | ||
dfb31b25 SH |
3263 | static void copy_rdepends(struct lxc_container *c, struct lxc_container *c0) |
3264 | { | |
3265 | char path0[MAXPATHLEN], path1[MAXPATHLEN]; | |
3266 | int ret; | |
3267 | ||
3268 | ret = snprintf(path0, MAXPATHLEN, "%s/%s/lxc_rdepends", c0->config_path, | |
3269 | c0->name); | |
3270 | if (ret < 0 || ret >= MAXPATHLEN) { | |
3271 | WARN("Error copying reverse dependencies"); | |
3272 | return; | |
3273 | } | |
3274 | ret = snprintf(path1, MAXPATHLEN, "%s/%s/lxc_rdepends", c->config_path, | |
3275 | c->name); | |
3276 | if (ret < 0 || ret >= MAXPATHLEN) { | |
3277 | WARN("Error copying reverse dependencies"); | |
3278 | return; | |
3279 | } | |
3280 | if (copy_file(path0, path1) < 0) { | |
3281 | INFO("Error copying reverse dependencies"); | |
3282 | return; | |
3283 | } | |
3284 | } | |
3285 | ||
3286 | static bool add_rdepends(struct lxc_container *c, struct lxc_container *c0) | |
3287 | { | |
3288 | int ret; | |
3289 | char path[MAXPATHLEN]; | |
3290 | FILE *f; | |
3291 | bool bret; | |
3292 | ||
3293 | ret = snprintf(path, MAXPATHLEN, "%s/%s/lxc_rdepends", c->config_path, | |
3294 | c->name); | |
3295 | if (ret < 0 || ret >= MAXPATHLEN) | |
3296 | return false; | |
3297 | f = fopen(path, "a"); | |
3298 | if (!f) | |
3299 | return false; | |
3300 | bret = true; | |
1a0e70ac | 3301 | /* If anything goes wrong, just return an error. */ |
dfb31b25 SH |
3302 | if (fprintf(f, "%s\n%s\n", c0->config_path, c0->name) < 0) |
3303 | bret = false; | |
3304 | if (fclose(f) != 0) | |
3305 | bret = false; | |
3306 | return bret; | |
3307 | } | |
3308 | ||
15a90a10 SH |
3309 | /* |
3310 | * If the fs natively supports snapshot clones with no penalty, | |
3311 | * then default to those even if not requested. | |
3312 | * Currently we only do this for btrfs. | |
3313 | */ | |
3314 | bool should_default_to_snapshot(struct lxc_container *c0, | |
3315 | struct lxc_container *c1) | |
3316 | { | |
3317 | size_t l0 = strlen(c0->config_path) + strlen(c0->name) + 2; | |
3318 | size_t l1 = strlen(c1->config_path) + strlen(c1->name) + 2; | |
3319 | char *p0 = alloca(l0 + 1); | |
3320 | char *p1 = alloca(l1 + 1); | |
6e0fa6a0 | 3321 | char *rootfs = c0->lxc_conf->rootfs.path; |
15a90a10 SH |
3322 | |
3323 | snprintf(p0, l0, "%s/%s", c0->config_path, c0->name); | |
3324 | snprintf(p1, l1, "%s/%s", c1->config_path, c1->name); | |
9a09badc CB |
3325 | |
3326 | if (!is_btrfs_fs(p0) || !is_btrfs_fs(p1)) | |
3327 | return false; | |
3328 | ||
6e0fa6a0 CB |
3329 | if (is_btrfs_subvol(rootfs) <= 0) |
3330 | return false; | |
3331 | ||
15a90a10 SH |
3332 | return btrfs_same_fs(p0, p1) == 0; |
3333 | } | |
3334 | ||
9be53773 | 3335 | static int copy_storage(struct lxc_container *c0, struct lxc_container *c, |
763429b6 CB |
3336 | const char *newtype, int flags, const char *bdevdata, |
3337 | uint64_t newsize) | |
9be53773 | 3338 | { |
10bc1861 | 3339 | struct lxc_storage *bdev; |
07db51a2 | 3340 | bool need_rdep; |
9be53773 | 3341 | |
15a90a10 SH |
3342 | if (should_default_to_snapshot(c0, c)) |
3343 | flags |= LXC_CLONE_SNAPSHOT; | |
3344 | ||
10bc1861 CB |
3345 | bdev = storage_copy(c0, c->name, c->config_path, newtype, flags, |
3346 | bdevdata, newsize, &need_rdep); | |
9be53773 | 3347 | if (!bdev) { |
763429b6 | 3348 | ERROR("Error copying storage."); |
9be53773 SH |
3349 | return -1; |
3350 | } | |
763429b6 CB |
3351 | |
3352 | /* Set new rootfs. */ | |
9be53773 SH |
3353 | free(c->lxc_conf->rootfs.path); |
3354 | c->lxc_conf->rootfs.path = strdup(bdev->src); | |
10bc1861 | 3355 | storage_put(bdev); |
763429b6 | 3356 | |
dfb31b25 | 3357 | if (!c->lxc_conf->rootfs.path) { |
763429b6 CB |
3358 | ERROR("Out of memory while setting storage path."); |
3359 | return -1; | |
3360 | } | |
763429b6 | 3361 | |
7a96a068 CB |
3362 | /* Append a new lxc.rootfs.path entry to the unexpanded config. */ |
3363 | clear_unexp_config_line(c->lxc_conf, "lxc.rootfs.path", false); | |
3364 | if (!do_append_unexp_config_line(c->lxc_conf, "lxc.rootfs.path", | |
763429b6 CB |
3365 | c->lxc_conf->rootfs.path)) { |
3366 | ERROR("Error saving new rootfs to cloned config."); | |
d0218321 SH |
3367 | return -1; |
3368 | } | |
763429b6 | 3369 | |
eee59f94 SH |
3370 | if (flags & LXC_CLONE_SNAPSHOT) |
3371 | copy_rdepends(c, c0); | |
dfb31b25 SH |
3372 | if (need_rdep) { |
3373 | if (!add_rdepends(c, c0)) | |
3374 | WARN("Error adding reverse dependency from %s to %s", | |
763429b6 | 3375 | c->name, c0->name); |
dfb31b25 SH |
3376 | } |
3377 | ||
3378 | mod_all_rdeps(c, true); | |
3379 | ||
9be53773 SH |
3380 | return 0; |
3381 | } | |
3382 | ||
1354955b SH |
3383 | struct clone_update_data { |
3384 | struct lxc_container *c0; | |
3385 | struct lxc_container *c1; | |
3386 | int flags; | |
3387 | char **hookargs; | |
3388 | }; | |
3389 | ||
3390 | static int clone_update_rootfs(struct clone_update_data *data) | |
9be53773 | 3391 | { |
1354955b SH |
3392 | struct lxc_container *c0 = data->c0; |
3393 | struct lxc_container *c = data->c1; | |
3394 | int flags = data->flags; | |
3395 | char **hookargs = data->hookargs; | |
9be53773 SH |
3396 | int ret = -1; |
3397 | char path[MAXPATHLEN]; | |
10bc1861 | 3398 | struct lxc_storage *bdev; |
9be53773 | 3399 | FILE *fout; |
148e91f5 | 3400 | struct lxc_conf *conf = c->lxc_conf; |
9be53773 SH |
3401 | |
3402 | /* update hostname in rootfs */ | |
3403 | /* we're going to mount, so run in a clean namespace to simplify cleanup */ | |
3404 | ||
1354955b SH |
3405 | if (setgid(0) < 0) { |
3406 | ERROR("Failed to setgid to 0"); | |
3407 | return -1; | |
3408 | } | |
3409 | if (setuid(0) < 0) { | |
3410 | ERROR("Failed to setuid to 0"); | |
9be53773 | 3411 | return -1; |
1354955b | 3412 | } |
c476bdce SH |
3413 | if (setgroups(0, NULL) < 0) |
3414 | WARN("Failed to clear groups"); | |
9be53773 | 3415 | |
1354955b SH |
3416 | if (unshare(CLONE_NEWNS) < 0) |
3417 | return -1; | |
8a388ed4 | 3418 | bdev = storage_init(c->lxc_conf); |
9be53773 | 3419 | if (!bdev) |
1354955b | 3420 | return -1; |
cf3ef16d SH |
3421 | if (strcmp(bdev->type, "dir") != 0) { |
3422 | if (unshare(CLONE_NEWNS) < 0) { | |
3423 | ERROR("error unsharing mounts"); | |
10bc1861 | 3424 | storage_put(bdev); |
1354955b | 3425 | return -1; |
cf3ef16d | 3426 | } |
2c6f3fc9 SH |
3427 | if (detect_shared_rootfs()) { |
3428 | if (mount(NULL, "/", NULL, MS_SLAVE|MS_REC, NULL)) { | |
3429 | SYSERROR("Failed to make / rslave"); | |
3430 | ERROR("Continuing..."); | |
3431 | } | |
3432 | } | |
e7de366c | 3433 | if (bdev->ops->mount(bdev) < 0) { |
10bc1861 | 3434 | storage_put(bdev); |
1354955b | 3435 | return -1; |
e7de366c | 3436 | } |
1a0e70ac | 3437 | } else { /* TODO come up with a better way */ |
f10fad2f | 3438 | free(bdev->dest); |
cf3ef16d SH |
3439 | bdev->dest = strdup(bdev->src); |
3440 | } | |
148e91f5 SH |
3441 | |
3442 | if (!lxc_list_empty(&conf->hooks[LXCHOOK_CLONE])) { | |
3443 | /* Start of environment variable setup for hooks */ | |
ab7efcf5 | 3444 | if (c0->name && setenv("LXC_SRC_NAME", c0->name, 1)) { |
1143ed39 DE |
3445 | SYSERROR("failed to set environment variable for source container name"); |
3446 | } | |
cb8ff4d0 | 3447 | if (setenv("LXC_NAME", c->name, 1)) { |
148e91f5 SH |
3448 | SYSERROR("failed to set environment variable for container name"); |
3449 | } | |
ab7efcf5 | 3450 | if (conf->rcfile && setenv("LXC_CONFIG_FILE", conf->rcfile, 1)) { |
148e91f5 SH |
3451 | SYSERROR("failed to set environment variable for config path"); |
3452 | } | |
ab7efcf5 | 3453 | if (bdev->dest && setenv("LXC_ROOTFS_MOUNT", bdev->dest, 1)) { |
148e91f5 SH |
3454 | SYSERROR("failed to set environment variable for rootfs mount"); |
3455 | } | |
ab7efcf5 | 3456 | if (conf->rootfs.path && setenv("LXC_ROOTFS_PATH", conf->rootfs.path, 1)) { |
148e91f5 SH |
3457 | SYSERROR("failed to set environment variable for rootfs mount"); |
3458 | } | |
3459 | ||
14a7b0f9 | 3460 | if (run_lxc_hooks(c->name, "clone", conf, hookargs)) { |
148e91f5 | 3461 | ERROR("Error executing clone hook for %s", c->name); |
10bc1861 | 3462 | storage_put(bdev); |
1354955b | 3463 | return -1; |
148e91f5 SH |
3464 | } |
3465 | } | |
3466 | ||
3467 | if (!(flags & LXC_CLONE_KEEPNAME)) { | |
3468 | ret = snprintf(path, MAXPATHLEN, "%s/etc/hostname", bdev->dest); | |
10bc1861 | 3469 | storage_put(bdev); |
e7de366c | 3470 | |
148e91f5 | 3471 | if (ret < 0 || ret >= MAXPATHLEN) |
1354955b | 3472 | return -1; |
8058be39 | 3473 | if (!file_exists(path)) |
1354955b | 3474 | return 0; |
148e91f5 | 3475 | if (!(fout = fopen(path, "w"))) { |
959aee9c | 3476 | SYSERROR("unable to open %s: ignoring", path); |
1354955b | 3477 | return 0; |
148e91f5 | 3478 | } |
a684f0b7 ÇO |
3479 | if (fprintf(fout, "%s", c->name) < 0) { |
3480 | fclose(fout); | |
1354955b | 3481 | return -1; |
6849cb5b | 3482 | } |
148e91f5 | 3483 | if (fclose(fout) < 0) |
1354955b | 3484 | return -1; |
10bc1861 CB |
3485 | } else { |
3486 | storage_put(bdev); | |
9be53773 | 3487 | } |
e7de366c | 3488 | |
1354955b SH |
3489 | return 0; |
3490 | } | |
3491 | ||
3492 | static int clone_update_rootfs_wrapper(void *data) | |
3493 | { | |
3494 | struct clone_update_data *arg = (struct clone_update_data *) data; | |
3495 | return clone_update_rootfs(arg); | |
9be53773 SH |
3496 | } |
3497 | ||
3498 | /* | |
3499 | * We want to support: | |
3500 | sudo lxc-clone -o o1 -n n1 -s -L|-fssize fssize -v|--vgname vgname \ | |
3501 | -p|--lvprefix lvprefix -t|--fstype fstype -B backingstore | |
3502 | ||
ba115175 CB |
3503 | -s [ implies overlay] |
3504 | -s -B overlay | |
9be53773 SH |
3505 | -s -B aufs |
3506 | ||
3507 | only rootfs gets converted (copied/snapshotted) on clone. | |
3508 | */ | |
3509 | ||
d5752559 | 3510 | static int create_file_dirname(char *path, struct lxc_conf *conf) |
9be53773 | 3511 | { |
c32981c3 | 3512 | char *p = strrchr(path, '/'); |
d5752559 | 3513 | int ret = -1; |
9be53773 SH |
3514 | |
3515 | if (!p) | |
3516 | return -1; | |
3517 | *p = '\0'; | |
d028235d | 3518 | ret = do_create_container_dir(path, conf); |
9be53773 SH |
3519 | *p = '/'; |
3520 | return ret; | |
3521 | } | |
3522 | ||
858377e4 | 3523 | static struct lxc_container *do_lxcapi_clone(struct lxc_container *c, const char *newname, |
9be53773 | 3524 | const char *lxcpath, int flags, |
d659597e | 3525 | const char *bdevtype, const char *bdevdata, uint64_t newsize, |
148e91f5 | 3526 | char **hookargs) |
9be53773 | 3527 | { |
9be53773 | 3528 | char newpath[MAXPATHLEN]; |
0e1a60b0 | 3529 | int fd, ret; |
1354955b | 3530 | struct clone_update_data data; |
3b392519 | 3531 | size_t saved_unexp_len; |
1354955b | 3532 | pid_t pid; |
17a367d8 CB |
3533 | int storage_copied = 0; |
3534 | char *origroot = NULL, *saved_unexp_conf = NULL; | |
3535 | struct lxc_container *c2 = NULL; | |
9be53773 | 3536 | |
858377e4 | 3537 | if (!c || !do_lxcapi_is_defined(c)) |
9be53773 SH |
3538 | return NULL; |
3539 | ||
5cee8c50 | 3540 | if (container_mem_lock(c)) |
9be53773 SH |
3541 | return NULL; |
3542 | ||
39dc698c | 3543 | if (!is_stopped(c)) { |
9be53773 SH |
3544 | ERROR("error: Original container (%s) is running", c->name); |
3545 | goto out; | |
3546 | } | |
3547 | ||
1a0e70ac | 3548 | /* Make sure the container doesn't yet exist. */ |
05d53f4c SH |
3549 | if (!newname) |
3550 | newname = c->name; | |
3551 | if (!lxcpath) | |
858377e4 | 3552 | lxcpath = do_lxcapi_get_config_path(c); |
05d53f4c | 3553 | ret = snprintf(newpath, MAXPATHLEN, "%s/%s/config", lxcpath, newname); |
6849cb5b | 3554 | if (ret < 0 || ret >= MAXPATHLEN) { |
9be53773 SH |
3555 | SYSERROR("clone: failed making config pathname"); |
3556 | goto out; | |
3557 | } | |
17a367d8 | 3558 | |
9be53773 SH |
3559 | if (file_exists(newpath)) { |
3560 | ERROR("error: clone: %s exists", newpath); | |
3561 | goto out; | |
3562 | } | |
3563 | ||
d5752559 | 3564 | ret = create_file_dirname(newpath, c->lxc_conf); |
96532523 | 3565 | if (ret < 0 && errno != EEXIST) { |
9be53773 SH |
3566 | ERROR("Error creating container dir for %s", newpath); |
3567 | goto out; | |
3568 | } | |
3569 | ||
1a0e70ac | 3570 | /* Copy the configuration. Tweak it as needed. */ |
8d2efe40 SH |
3571 | if (c->lxc_conf->rootfs.path) { |
3572 | origroot = c->lxc_conf->rootfs.path; | |
3573 | c->lxc_conf->rootfs.path = NULL; | |
3574 | } | |
0e1a60b0 CB |
3575 | |
3576 | fd = open(newpath, O_WRONLY | O_CREAT | O_CLOEXEC, | |
3577 | S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH); | |
3578 | if (fd < 0) { | |
3579 | SYSERROR("Failed to open \"%s\"", newpath); | |
9be53773 SH |
3580 | goto out; |
3581 | } | |
5eea90e8 SH |
3582 | |
3583 | saved_unexp_conf = c->lxc_conf->unexpanded_config; | |
3b392519 | 3584 | saved_unexp_len = c->lxc_conf->unexpanded_len; |
5eea90e8 SH |
3585 | c->lxc_conf->unexpanded_config = strdup(saved_unexp_conf); |
3586 | if (!c->lxc_conf->unexpanded_config) { | |
0e1a60b0 | 3587 | close(fd); |
5eea90e8 SH |
3588 | goto out; |
3589 | } | |
7a96a068 | 3590 | |
7a96a068 | 3591 | clear_unexp_config_line(c->lxc_conf, "lxc.rootfs.path", false); |
0e1a60b0 CB |
3592 | write_config(fd, c->lxc_conf); |
3593 | close(fd); | |
8d2efe40 | 3594 | c->lxc_conf->rootfs.path = origroot; |
5eea90e8 SH |
3595 | free(c->lxc_conf->unexpanded_config); |
3596 | c->lxc_conf->unexpanded_config = saved_unexp_conf; | |
3597 | saved_unexp_conf = NULL; | |
3b392519 | 3598 | c->lxc_conf->unexpanded_len = saved_unexp_len; |
9be53773 | 3599 | |
90b366fc CB |
3600 | ret = snprintf(newpath, MAXPATHLEN, "%s/%s/rootfs", lxcpath, newname); |
3601 | if (ret < 0 || ret >= MAXPATHLEN) { | |
3602 | SYSERROR("clone: failed making rootfs pathname"); | |
3603 | goto out; | |
3604 | } | |
17a367d8 CB |
3605 | |
3606 | ret = mkdir(newpath, 0755); | |
3607 | if (ret < 0) { | |
3608 | /* For an overlay container the rootfs is considered immutable | |
3609 | * and will not have been removed when restoring from a | |
3610 | * snapshot. | |
3611 | */ | |
3612 | if (errno != ENOENT && | |
3613 | !(flags & LXC_STORAGE_INTERNAL_OVERLAY_RESTORE)) { | |
3614 | SYSERROR("Failed to create directory \"%s\"", newpath); | |
3615 | goto out; | |
3616 | } | |
9be53773 SH |
3617 | } |
3618 | ||
e0010464 | 3619 | if (am_guest_unpriv()) { |
1354955b | 3620 | if (chown_mapped_root(newpath, c->lxc_conf) < 0) { |
959aee9c | 3621 | ERROR("Error chowning %s to container root", newpath); |
1354955b SH |
3622 | goto out; |
3623 | } | |
3624 | } | |
3625 | ||
05d53f4c | 3626 | c2 = lxc_container_new(newname, lxcpath); |
375c2258 | 3627 | if (!c2) { |
05d53f4c SH |
3628 | ERROR("clone: failed to create new container (%s %s)", newname, |
3629 | lxcpath); | |
9be53773 SH |
3630 | goto out; |
3631 | } | |
8d2efe40 | 3632 | |
1a0e70ac | 3633 | /* copy/snapshot rootfs's */ |
8d2efe40 SH |
3634 | ret = copy_storage(c, c2, bdevtype, flags, bdevdata, newsize); |
3635 | if (ret < 0) | |
3636 | goto out; | |
9be53773 | 3637 | |
6b0d5538 | 3638 | |
1a0e70ac | 3639 | /* update utsname */ |
3d7ad474 CB |
3640 | if (!(flags & LXC_CLONE_KEEPNAME)) { |
3641 | clear_unexp_config_line(c2->lxc_conf, "lxc.utsname", false); | |
b67771bc | 3642 | clear_unexp_config_line(c2->lxc_conf, "lxc.uts.name", false); |
3d7ad474 | 3643 | |
0d9cd9c3 | 3644 | if (!do_set_config_item_locked(c2, "lxc.uts.name", newname)) { |
3d7ad474 CB |
3645 | ERROR("Error setting new hostname"); |
3646 | goto out; | |
3647 | } | |
96532523 SH |
3648 | } |
3649 | ||
1a0e70ac | 3650 | /* copy hooks */ |
619256b5 ÇO |
3651 | ret = copyhooks(c, c2); |
3652 | if (ret < 0) { | |
3653 | ERROR("error copying hooks"); | |
3654 | goto out; | |
9be53773 SH |
3655 | } |
3656 | ||
3657 | if (copy_fstab(c, c2) < 0) { | |
3658 | ERROR("error copying fstab"); | |
9be53773 SH |
3659 | goto out; |
3660 | } | |
3661 | ||
1a0e70ac | 3662 | /* update macaddrs */ |
6b0d5538 | 3663 | if (!(flags & LXC_CLONE_KEEPMACADDR)) { |
67702c21 SH |
3664 | if (!network_new_hwaddrs(c2->lxc_conf)) { |
3665 | ERROR("Error updating mac addresses"); | |
6b0d5538 SH |
3666 | goto out; |
3667 | } | |
3668 | } | |
9be53773 | 3669 | |
1a0e70ac | 3670 | /* Update absolute paths for overlay mount directories. */ |
83e79752 | 3671 | if (ovl_update_abs_paths(c2->lxc_conf, c->config_path, c->name, lxcpath, newname) < 0) |
030ce9a9 CB |
3672 | goto out; |
3673 | ||
1a0e70ac CB |
3674 | /* We've now successfully created c2's storage, so clear it out if we |
3675 | * fail after this. | |
3676 | */ | |
176d9acb SH |
3677 | storage_copied = 1; |
3678 | ||
375c2258 | 3679 | if (!c2->save_config(c2, NULL)) |
9be53773 | 3680 | goto out; |
9be53773 | 3681 | |
1354955b SH |
3682 | if ((pid = fork()) < 0) { |
3683 | SYSERROR("fork"); | |
9be53773 | 3684 | goto out; |
1354955b SH |
3685 | } |
3686 | if (pid > 0) { | |
3687 | ret = wait_for_pid(pid); | |
3688 | if (ret) | |
3689 | goto out; | |
3690 | container_mem_unlock(c); | |
3691 | return c2; | |
3692 | } | |
3693 | data.c0 = c; | |
3694 | data.c1 = c2; | |
3695 | data.flags = flags; | |
3696 | data.hookargs = hookargs; | |
e0010464 | 3697 | if (am_guest_unpriv()) |
ee484f7f CB |
3698 | ret = userns_exec_full(c->lxc_conf, clone_update_rootfs_wrapper, |
3699 | &data, "clone_update_rootfs_wrapper"); | |
1354955b SH |
3700 | else |
3701 | ret = clone_update_rootfs(&data); | |
3702 | if (ret < 0) | |
d8480a31 | 3703 | _exit(EXIT_FAILURE); |
9be53773 | 3704 | |
5cee8c50 | 3705 | container_mem_unlock(c); |
d8480a31 | 3706 | _exit(EXIT_SUCCESS); |
9be53773 SH |
3707 | |
3708 | out: | |
5cee8c50 | 3709 | container_mem_unlock(c); |
375c2258 | 3710 | if (c2) { |
176d9acb SH |
3711 | if (!storage_copied) |
3712 | c2->lxc_conf->rootfs.path = NULL; | |
375c2258 | 3713 | c2->destroy(c2); |
9be53773 | 3714 | lxc_container_put(c2); |
375c2258 | 3715 | } |
9be53773 SH |
3716 | |
3717 | return NULL; | |
3718 | } | |
3719 | ||
858377e4 SH |
3720 | static struct lxc_container *lxcapi_clone(struct lxc_container *c, const char *newname, |
3721 | const char *lxcpath, int flags, | |
3722 | const char *bdevtype, const char *bdevdata, uint64_t newsize, | |
3723 | char **hookargs) | |
3724 | { | |
3725 | struct lxc_container * ret; | |
3726 | current_config = c ? c->lxc_conf : NULL; | |
3727 | ret = do_lxcapi_clone(c, newname, lxcpath, flags, bdevtype, bdevdata, newsize, hookargs); | |
3728 | current_config = NULL; | |
3729 | return ret; | |
3730 | } | |
3731 | ||
3732 | static bool do_lxcapi_rename(struct lxc_container *c, const char *newname) | |
06e5650e | 3733 | { |
10bc1861 | 3734 | struct lxc_storage *bdev; |
06e5650e | 3735 | struct lxc_container *newc; |
06e5650e | 3736 | |
d693cf93 | 3737 | if (!c || !c->name || !c->config_path || !c->lxc_conf) |
06e5650e ÇO |
3738 | return false; |
3739 | ||
18aa217b SH |
3740 | if (has_fs_snapshots(c) || has_snapshots(c)) { |
3741 | ERROR("Renaming a container with snapshots is not supported"); | |
3742 | return false; | |
3743 | } | |
8a388ed4 | 3744 | bdev = storage_init(c->lxc_conf); |
06e5650e ÇO |
3745 | if (!bdev) { |
3746 | ERROR("Failed to find original backing store type"); | |
3747 | return false; | |
3748 | } | |
3749 | ||
619256b5 | 3750 | newc = lxcapi_clone(c, newname, c->config_path, LXC_CLONE_KEEPMACADDR, NULL, bdev->type, 0, NULL); |
10bc1861 | 3751 | storage_put(bdev); |
06e5650e ÇO |
3752 | if (!newc) { |
3753 | lxc_container_put(newc); | |
3754 | return false; | |
3755 | } | |
3756 | ||
3757 | if (newc && lxcapi_is_defined(newc)) | |
3758 | lxc_container_put(newc); | |
3759 | ||
17a367d8 | 3760 | if (!container_destroy(c, NULL)) { |
06e5650e ÇO |
3761 | ERROR("Could not destroy existing container %s", c->name); |
3762 | return false; | |
3763 | } | |
3764 | return true; | |
3765 | } | |
3766 | ||
858377e4 SH |
3767 | WRAP_API_1(bool, lxcapi_rename, const char *) |
3768 | ||
a0e93eeb CS |
3769 | static int lxcapi_attach(struct lxc_container *c, lxc_attach_exec_t exec_function, void *exec_payload, lxc_attach_options_t *options, pid_t *attached_process) |
3770 | { | |
858377e4 SH |
3771 | int ret; |
3772 | ||
a0e93eeb CS |
3773 | if (!c) |
3774 | return -1; | |
3775 | ||
858377e4 SH |
3776 | current_config = c->lxc_conf; |
3777 | ||
3778 | ret = lxc_attach(c->name, c->config_path, exec_function, exec_payload, options, attached_process); | |
3779 | current_config = NULL; | |
3780 | return ret; | |
a0e93eeb CS |
3781 | } |
3782 | ||
858377e4 | 3783 | static int do_lxcapi_attach_run_wait(struct lxc_container *c, lxc_attach_options_t *options, const char *program, const char * const argv[]) |
a0e93eeb CS |
3784 | { |
3785 | lxc_attach_command_t command; | |
3786 | pid_t pid; | |
3787 | int r; | |
3788 | ||
3789 | if (!c) | |
3790 | return -1; | |
3791 | ||
3792 | command.program = (char*)program; | |
3793 | command.argv = (char**)argv; | |
3794 | r = lxc_attach(c->name, c->config_path, lxc_attach_run_command, &command, options, &pid); | |
3795 | if (r < 0) { | |
3796 | ERROR("ups"); | |
3797 | return r; | |
3798 | } | |
3799 | return lxc_wait_for_pid_status(pid); | |
3800 | } | |
3801 | ||
858377e4 SH |
3802 | static int lxcapi_attach_run_wait(struct lxc_container *c, lxc_attach_options_t *options, const char *program, const char * const argv[]) |
3803 | { | |
3804 | int ret; | |
3805 | current_config = c ? c->lxc_conf : NULL; | |
3806 | ret = do_lxcapi_attach_run_wait(c, options, program, argv); | |
3807 | current_config = NULL; | |
3808 | return ret; | |
3809 | } | |
3810 | ||
74a3920a | 3811 | static int get_next_index(const char *lxcpath, char *cname) |
f5dd1d53 SH |
3812 | { |
3813 | char *fname; | |
3814 | struct stat sb; | |
3815 | int i = 0, ret; | |
3816 | ||
3817 | fname = alloca(strlen(lxcpath) + 20); | |
3818 | while (1) { | |
3819 | sprintf(fname, "%s/snap%d", lxcpath, i); | |
3820 | ret = stat(fname, &sb); | |
3821 | if (ret != 0) | |
3822 | return i; | |
3823 | i++; | |
3824 | } | |
3825 | } | |
3826 | ||
18aa217b SH |
3827 | static bool get_snappath_dir(struct lxc_container *c, char *snappath) |
3828 | { | |
3829 | int ret; | |
3830 | /* | |
3831 | * If the old style snapshot path exists, use it | |
3832 | * /var/lib/lxc -> /var/lib/lxcsnaps | |
3833 | */ | |
3834 | ret = snprintf(snappath, MAXPATHLEN, "%ssnaps", c->config_path); | |
3835 | if (ret < 0 || ret >= MAXPATHLEN) | |
3836 | return false; | |
3837 | if (dir_exists(snappath)) { | |
3838 | ret = snprintf(snappath, MAXPATHLEN, "%ssnaps/%s", c->config_path, c->name); | |
3839 | if (ret < 0 || ret >= MAXPATHLEN) | |
3840 | return false; | |
3841 | return true; | |
3842 | } | |
3843 | ||
3844 | /* | |
3845 | * Use the new style path | |
3846 | * /var/lib/lxc -> /var/lib/lxc + c->name + /snaps + \0 | |
3847 | */ | |
3848 | ret = snprintf(snappath, MAXPATHLEN, "%s/%s/snaps", c->config_path, c->name); | |
3849 | if (ret < 0 || ret >= MAXPATHLEN) | |
3850 | return false; | |
3851 | return true; | |
3852 | } | |
3853 | ||
858377e4 | 3854 | static int do_lxcapi_snapshot(struct lxc_container *c, const char *commentfile) |
f5dd1d53 SH |
3855 | { |
3856 | int i, flags, ret; | |
3857 | struct lxc_container *c2; | |
3858 | char snappath[MAXPATHLEN], newname[20]; | |
3859 | ||
840f05df SH |
3860 | if (!c || !lxcapi_is_defined(c)) |
3861 | return -1; | |
3862 | ||
10bc1861 | 3863 | if (!storage_can_backup(c->lxc_conf)) { |
cdd01be2 SH |
3864 | ERROR("%s's backing store cannot be backed up.", c->name); |
3865 | ERROR("Your container must use another backing store type."); | |
3866 | return -1; | |
3867 | } | |
3868 | ||
18aa217b | 3869 | if (!get_snappath_dir(c, snappath)) |
f5dd1d53 | 3870 | return -1; |
18aa217b | 3871 | |
f5dd1d53 SH |
3872 | i = get_next_index(snappath, c->name); |
3873 | ||
3874 | if (mkdir_p(snappath, 0755) < 0) { | |
3875 | ERROR("Failed to create snapshot directory %s", snappath); | |
3876 | return -1; | |
3877 | } | |
3878 | ||
3879 | ret = snprintf(newname, 20, "snap%d", i); | |
3880 | if (ret < 0 || ret >= 20) | |
3881 | return -1; | |
3882 | ||
0a83cbbb SH |
3883 | /* |
3884 | * We pass LXC_CLONE_SNAPSHOT to make sure that a rdepends file entry is | |
3885 | * created in the original container | |
3886 | */ | |
3887 | flags = LXC_CLONE_SNAPSHOT | LXC_CLONE_KEEPMACADDR | LXC_CLONE_KEEPNAME | | |
3888 | LXC_CLONE_KEEPBDEVTYPE | LXC_CLONE_MAYBE_SNAPSHOT; | |
068aa488 | 3889 | if (storage_is_dir(c->lxc_conf)) { |
8c39f7a4 SH |
3890 | ERROR("Snapshot of directory-backed container requested."); |
3891 | ERROR("Making a copy-clone. If you do want snapshots, then"); | |
ba115175 | 3892 | ERROR("please create an aufs or overlay clone first, snapshot that"); |
8c39f7a4 SH |
3893 | ERROR("and keep the original container pristine."); |
3894 | flags &= ~LXC_CLONE_SNAPSHOT | LXC_CLONE_MAYBE_SNAPSHOT; | |
3895 | } | |
858377e4 | 3896 | c2 = do_lxcapi_clone(c, newname, snappath, flags, NULL, NULL, 0, NULL); |
f5dd1d53 | 3897 | if (!c2) { |
959aee9c | 3898 | ERROR("clone of %s:%s failed", c->config_path, c->name); |
f5dd1d53 SH |
3899 | return -1; |
3900 | } | |
3901 | ||
3902 | lxc_container_put(c2); | |
3903 | ||
1a0e70ac | 3904 | /* Now write down the creation time. */ |
f5dd1d53 SH |
3905 | time_t timer; |
3906 | char buffer[25]; | |
3907 | struct tm* tm_info; | |
025ed0f3 | 3908 | FILE *f; |
f5dd1d53 SH |
3909 | |
3910 | time(&timer); | |
3911 | tm_info = localtime(&timer); | |
3912 | ||
3913 | strftime(buffer, 25, "%Y:%m:%d %H:%M:%S", tm_info); | |
3914 | ||
3915 | char *dfnam = alloca(strlen(snappath) + strlen(newname) + 5); | |
3916 | sprintf(dfnam, "%s/%s/ts", snappath, newname); | |
025ed0f3 | 3917 | f = fopen(dfnam, "w"); |
f5dd1d53 | 3918 | if (!f) { |
959aee9c | 3919 | ERROR("Failed to open %s", dfnam); |
f5dd1d53 SH |
3920 | return -1; |
3921 | } | |
3922 | if (fprintf(f, "%s", buffer) < 0) { | |
3923 | SYSERROR("Writing timestamp"); | |
3924 | fclose(f); | |
3925 | return -1; | |
3926 | } | |
025ed0f3 | 3927 | ret = fclose(f); |
025ed0f3 | 3928 | if (ret != 0) { |
f5dd1d53 SH |
3929 | SYSERROR("Writing timestamp"); |
3930 | return -1; | |
3931 | } | |
3932 | ||
3933 | if (commentfile) { | |
1a0e70ac | 3934 | /* $p / $name / comment \0 */ |
f5dd1d53 SH |
3935 | int len = strlen(snappath) + strlen(newname) + 10; |
3936 | char *path = alloca(len); | |
3937 | sprintf(path, "%s/%s/comment", snappath, newname); | |
3938 | return copy_file(commentfile, path) < 0 ? -1 : i; | |
3939 | } | |
3940 | ||
3941 | return i; | |
3942 | } | |
3943 | ||
858377e4 SH |
3944 | WRAP_API_1(int, lxcapi_snapshot, const char *) |
3945 | ||
f5dd1d53 SH |
3946 | static void lxcsnap_free(struct lxc_snapshot *s) |
3947 | { | |
f10fad2f ME |
3948 | free(s->name); |
3949 | free(s->comment_pathname); | |
3950 | free(s->timestamp); | |
3951 | free(s->lxcpath); | |
f5dd1d53 SH |
3952 | } |
3953 | ||
3954 | static char *get_snapcomment_path(char* snappath, char *name) | |
3955 | { | |
1a0e70ac | 3956 | /* $snappath/$name/comment */ |
f5dd1d53 SH |
3957 | int ret, len = strlen(snappath) + strlen(name) + 10; |
3958 | char *s = malloc(len); | |
3959 | ||
3960 | if (s) { | |
3961 | ret = snprintf(s, len, "%s/%s/comment", snappath, name); | |
3962 | if (ret < 0 || ret >= len) { | |
3963 | free(s); | |
3964 | s = NULL; | |
3965 | } | |
3966 | } | |
3967 | return s; | |
3968 | } | |
3969 | ||
3970 | static char *get_timestamp(char* snappath, char *name) | |
3971 | { | |
3972 | char path[MAXPATHLEN], *s = NULL; | |
3973 | int ret, len; | |
3974 | FILE *fin; | |
3975 | ||
3976 | ret = snprintf(path, MAXPATHLEN, "%s/%s/ts", snappath, name); | |
3977 | if (ret < 0 || ret >= MAXPATHLEN) | |
3978 | return NULL; | |
025ed0f3 | 3979 | fin = fopen(path, "r"); |
025ed0f3 | 3980 | if (!fin) |
f5dd1d53 SH |
3981 | return NULL; |
3982 | (void) fseek(fin, 0, SEEK_END); | |
3983 | len = ftell(fin); | |
3984 | (void) fseek(fin, 0, SEEK_SET); | |
3985 | if (len > 0) { | |
3986 | s = malloc(len+1); | |
3987 | if (s) { | |
3988 | s[len] = '\0'; | |
3989 | if (fread(s, 1, len, fin) != len) { | |
3990 | SYSERROR("reading timestamp"); | |
3991 | free(s); | |
3992 | s = NULL; | |
3993 | } | |
3994 | } | |
3995 | } | |
3996 | fclose(fin); | |
3997 | return s; | |
3998 | } | |
3999 | ||
858377e4 | 4000 | static int do_lxcapi_snapshot_list(struct lxc_container *c, struct lxc_snapshot **ret_snaps) |
f5dd1d53 SH |
4001 | { |
4002 | char snappath[MAXPATHLEN], path2[MAXPATHLEN]; | |
18aa217b | 4003 | int count = 0, ret; |
74f96976 | 4004 | struct dirent *direntp; |
f5dd1d53 SH |
4005 | struct lxc_snapshot *snaps =NULL, *nsnaps; |
4006 | DIR *dir; | |
4007 | ||
4008 | if (!c || !lxcapi_is_defined(c)) | |
4009 | return -1; | |
c868b261 | 4010 | |
18aa217b | 4011 | if (!get_snappath_dir(c, snappath)) { |
f5dd1d53 SH |
4012 | ERROR("path name too long"); |
4013 | return -1; | |
4014 | } | |
025ed0f3 | 4015 | dir = opendir(snappath); |
025ed0f3 | 4016 | if (!dir) { |
f5dd1d53 SH |
4017 | INFO("failed to open %s - assuming no snapshots", snappath); |
4018 | return 0; | |
4019 | } | |
4020 | ||
74f96976 | 4021 | while ((direntp = readdir(dir))) { |
f5dd1d53 SH |
4022 | if (!direntp) |
4023 | break; | |
4024 | ||
4025 | if (!strcmp(direntp->d_name, ".")) | |
4026 | continue; | |
4027 | ||
4028 | if (!strcmp(direntp->d_name, "..")) | |
4029 | continue; | |
4030 | ||
4031 | ret = snprintf(path2, MAXPATHLEN, "%s/%s/config", snappath, direntp->d_name); | |
4032 | if (ret < 0 || ret >= MAXPATHLEN) { | |
4033 | ERROR("pathname too long"); | |
4034 | goto out_free; | |
4035 | } | |
4036 | if (!file_exists(path2)) | |
4037 | continue; | |
4038 | nsnaps = realloc(snaps, (count + 1)*sizeof(*snaps)); | |
4039 | if (!nsnaps) { | |
4040 | SYSERROR("Out of memory"); | |
4041 | goto out_free; | |
4042 | } | |
4043 | snaps = nsnaps; | |
4044 | snaps[count].free = lxcsnap_free; | |
4045 | snaps[count].name = strdup(direntp->d_name); | |
4046 | if (!snaps[count].name) | |
4047 | goto out_free; | |
4048 | snaps[count].lxcpath = strdup(snappath); | |
4049 | if (!snaps[count].lxcpath) { | |
4050 | free(snaps[count].name); | |
4051 | goto out_free; | |
4052 | } | |
4053 | snaps[count].comment_pathname = get_snapcomment_path(snappath, direntp->d_name); | |
4054 | snaps[count].timestamp = get_timestamp(snappath, direntp->d_name); | |
4055 | count++; | |
4056 | } | |
4057 | ||
4058 | if (closedir(dir)) | |
4059 | WARN("failed to close directory"); | |
4060 | ||
4061 | *ret_snaps = snaps; | |
4062 | return count; | |
4063 | ||
4064 | out_free: | |
4065 | if (snaps) { | |
4066 | int i; | |
4067 | for (i=0; i<count; i++) | |
4068 | lxcsnap_free(&snaps[i]); | |
4069 | free(snaps); | |
4070 | } | |
9baa57bd SH |
4071 | if (closedir(dir)) |
4072 | WARN("failed to close directory"); | |
f5dd1d53 SH |
4073 | return -1; |
4074 | } | |
4075 | ||
858377e4 SH |
4076 | WRAP_API_1(int, lxcapi_snapshot_list, struct lxc_snapshot **) |
4077 | ||
4078 | static bool do_lxcapi_snapshot_restore(struct lxc_container *c, const char *snapname, const char *newname) | |
f5dd1d53 SH |
4079 | { |
4080 | char clonelxcpath[MAXPATHLEN]; | |
18aa217b | 4081 | int flags = 0; |
f5dd1d53 | 4082 | struct lxc_container *snap, *rest; |
10bc1861 | 4083 | struct lxc_storage *bdev; |
f5dd1d53 SH |
4084 | bool b = false; |
4085 | ||
4086 | if (!c || !c->name || !c->config_path) | |
4087 | return false; | |
4088 | ||
18aa217b SH |
4089 | if (has_fs_snapshots(c)) { |
4090 | ERROR("container rootfs has dependent snapshots"); | |
4091 | return false; | |
4092 | } | |
4093 | ||
8a388ed4 | 4094 | bdev = storage_init(c->lxc_conf); |
f5dd1d53 SH |
4095 | if (!bdev) { |
4096 | ERROR("Failed to find original backing store type"); | |
4097 | return false; | |
4098 | } | |
4099 | ||
17a367d8 CB |
4100 | /* For an overlay container the rootfs is considered immutable |
4101 | * and cannot be removed when restoring from a snapshot. We pass this | |
4102 | * internal flag along to communicate this to various parts of the | |
4103 | * codebase. | |
4104 | */ | |
4105 | if (!strcmp(bdev->type, "overlay") || !strcmp(bdev->type, "overlayfs")) | |
4106 | bdev->flags |= LXC_STORAGE_INTERNAL_OVERLAY_RESTORE; | |
4107 | ||
f5dd1d53 SH |
4108 | if (!newname) |
4109 | newname = c->name; | |
7e36f87e | 4110 | |
18aa217b | 4111 | if (!get_snappath_dir(c, clonelxcpath)) { |
10bc1861 | 4112 | storage_put(bdev); |
f5dd1d53 SH |
4113 | return false; |
4114 | } | |
1a0e70ac | 4115 | /* how should we lock this? */ |
f5dd1d53 SH |
4116 | |
4117 | snap = lxc_container_new(snapname, clonelxcpath); | |
4118 | if (!snap || !lxcapi_is_defined(snap)) { | |
4119 | ERROR("Could not open snapshot %s", snapname); | |
17a367d8 CB |
4120 | if (snap) |
4121 | lxc_container_put(snap); | |
10bc1861 | 4122 | storage_put(bdev); |
f5dd1d53 SH |
4123 | return false; |
4124 | } | |
4125 | ||
17a367d8 CB |
4126 | if (!strcmp(c->name, newname)) { |
4127 | if (!container_destroy(c, bdev)) { | |
7e36f87e ÇO |
4128 | ERROR("Could not destroy existing container %s", newname); |
4129 | lxc_container_put(snap); | |
10bc1861 | 4130 | storage_put(bdev); |
7e36f87e ÇO |
4131 | return false; |
4132 | } | |
4133 | } | |
4134 | ||
de269ee8 SH |
4135 | if (strcmp(bdev->type, "dir") != 0 && strcmp(bdev->type, "loop") != 0) |
4136 | flags = LXC_CLONE_SNAPSHOT | LXC_CLONE_MAYBE_SNAPSHOT; | |
17a367d8 CB |
4137 | |
4138 | if (!strcmp(bdev->type, "overlay") || !strcmp(bdev->type, "overlayfs")) | |
4139 | flags |= LXC_STORAGE_INTERNAL_OVERLAY_RESTORE; | |
09f6f8c4 CB |
4140 | rest = lxcapi_clone(snap, newname, c->config_path, flags, bdev->type, |
4141 | NULL, 0, NULL); | |
10bc1861 | 4142 | storage_put(bdev); |
f5dd1d53 SH |
4143 | if (rest && lxcapi_is_defined(rest)) |
4144 | b = true; | |
4145 | if (rest) | |
4146 | lxc_container_put(rest); | |
17a367d8 | 4147 | |
f5dd1d53 SH |
4148 | lxc_container_put(snap); |
4149 | return b; | |
4150 | } | |
4151 | ||
858377e4 SH |
4152 | WRAP_API_2(bool, lxcapi_snapshot_restore, const char *, const char *) |
4153 | ||
18aa217b | 4154 | static bool do_snapshot_destroy(const char *snapname, const char *clonelxcpath) |
771d96b3 | 4155 | { |
771d96b3 | 4156 | struct lxc_container *snap = NULL; |
18aa217b | 4157 | bool bret = false; |
771d96b3 ÇO |
4158 | |
4159 | snap = lxc_container_new(snapname, clonelxcpath); | |
18aa217b | 4160 | if (!snap) { |
771d96b3 ÇO |
4161 | ERROR("Could not find snapshot %s", snapname); |
4162 | goto err; | |
4163 | } | |
4164 | ||
858377e4 | 4165 | if (!do_lxcapi_destroy(snap)) { |
771d96b3 ÇO |
4166 | ERROR("Could not destroy snapshot %s", snapname); |
4167 | goto err; | |
4168 | } | |
18aa217b | 4169 | bret = true; |
771d96b3 | 4170 | |
771d96b3 ÇO |
4171 | err: |
4172 | if (snap) | |
4173 | lxc_container_put(snap); | |
18aa217b SH |
4174 | return bret; |
4175 | } | |
4176 | ||
4177 | static bool remove_all_snapshots(const char *path) | |
4178 | { | |
4179 | DIR *dir; | |
74f96976 | 4180 | struct dirent *direntp; |
18aa217b SH |
4181 | bool bret = true; |
4182 | ||
4183 | dir = opendir(path); | |
4184 | if (!dir) { | |
4185 | SYSERROR("opendir on snapshot path %s", path); | |
4186 | return false; | |
4187 | } | |
74f96976 | 4188 | while ((direntp = readdir(dir))) { |
18aa217b SH |
4189 | if (!strcmp(direntp->d_name, ".")) |
4190 | continue; | |
4191 | if (!strcmp(direntp->d_name, "..")) | |
4192 | continue; | |
4193 | if (!do_snapshot_destroy(direntp->d_name, path)) { | |
4194 | bret = false; | |
4195 | continue; | |
4196 | } | |
4197 | } | |
4198 | ||
4199 | closedir(dir); | |
4200 | ||
4201 | if (rmdir(path)) | |
4202 | SYSERROR("Error removing directory %s", path); | |
4203 | ||
4204 | return bret; | |
4205 | } | |
4206 | ||
858377e4 | 4207 | static bool do_lxcapi_snapshot_destroy(struct lxc_container *c, const char *snapname) |
18aa217b SH |
4208 | { |
4209 | char clonelxcpath[MAXPATHLEN]; | |
4210 | ||
4211 | if (!c || !c->name || !c->config_path || !snapname) | |
4212 | return false; | |
4213 | ||
4214 | if (!get_snappath_dir(c, clonelxcpath)) | |
4215 | return false; | |
4216 | ||
4217 | return do_snapshot_destroy(snapname, clonelxcpath); | |
4218 | } | |
4219 | ||
858377e4 SH |
4220 | WRAP_API_1(bool, lxcapi_snapshot_destroy, const char *) |
4221 | ||
4222 | static bool do_lxcapi_snapshot_destroy_all(struct lxc_container *c) | |
18aa217b SH |
4223 | { |
4224 | char clonelxcpath[MAXPATHLEN]; | |
4225 | ||
4226 | if (!c || !c->name || !c->config_path) | |
4227 | return false; | |
4228 | ||
4229 | if (!get_snappath_dir(c, clonelxcpath)) | |
4230 | return false; | |
4231 | ||
4232 | return remove_all_snapshots(clonelxcpath); | |
771d96b3 ÇO |
4233 | } |
4234 | ||
858377e4 SH |
4235 | WRAP_API(bool, lxcapi_snapshot_destroy_all) |
4236 | ||
4237 | static bool do_lxcapi_may_control(struct lxc_container *c) | |
b494d2dd SH |
4238 | { |
4239 | return lxc_try_cmd(c->name, c->config_path) == 0; | |
4240 | } | |
4241 | ||
858377e4 SH |
4242 | WRAP_API(bool, lxcapi_may_control) |
4243 | ||
d5aa23e6 | 4244 | static bool do_add_remove_node(pid_t init_pid, const char *path, bool add, |
b69dfc9f | 4245 | struct stat *st) |
d5aa23e6 | 4246 | { |
b69dfc9f CB |
4247 | int ret; |
4248 | char *tmp; | |
4249 | pid_t pid; | |
d5aa23e6 SH |
4250 | char chrootpath[MAXPATHLEN]; |
4251 | char *directory_path = NULL; | |
d5aa23e6 | 4252 | |
b69dfc9f CB |
4253 | pid = fork(); |
4254 | if (pid < 0) { | |
4255 | SYSERROR("Failed to fork()"); | |
d5aa23e6 SH |
4256 | return false; |
4257 | } | |
b69dfc9f | 4258 | |
d5aa23e6 | 4259 | if (pid) { |
b69dfc9f CB |
4260 | ret = wait_for_pid(pid); |
4261 | if (ret != 0) { | |
4262 | ERROR("Failed to create device node"); | |
d5aa23e6 SH |
4263 | return false; |
4264 | } | |
b69dfc9f | 4265 | |
d5aa23e6 SH |
4266 | return true; |
4267 | } | |
4268 | ||
4269 | /* prepare the path */ | |
4270 | ret = snprintf(chrootpath, MAXPATHLEN, "/proc/%d/root", init_pid); | |
4271 | if (ret < 0 || ret >= MAXPATHLEN) | |
4272 | return false; | |
4273 | ||
b69dfc9f CB |
4274 | ret = chroot(chrootpath); |
4275 | if (ret < 0) | |
a7764ce7 | 4276 | _exit(EXIT_FAILURE); |
b69dfc9f CB |
4277 | |
4278 | ret = chdir("/"); | |
4279 | if (ret < 0) | |
a7764ce7 | 4280 | _exit(EXIT_FAILURE); |
b69dfc9f | 4281 | |
d5aa23e6 | 4282 | /* remove path if it exists */ |
b69dfc9f CB |
4283 | ret = faccessat(AT_FDCWD, path, F_OK, AT_SYMLINK_NOFOLLOW); |
4284 | if(ret == 0) { | |
4285 | ret = unlink(path); | |
c7d76c09 CB |
4286 | if (ret < 0) { |
4287 | ERROR("%s - Failed to remove \"%s\"", strerror(errno), path); | |
a7764ce7 | 4288 | _exit(EXIT_FAILURE); |
c7d76c09 | 4289 | } |
d5aa23e6 | 4290 | } |
b69dfc9f | 4291 | |
d5aa23e6 | 4292 | if (!add) |
a7764ce7 | 4293 | _exit(EXIT_SUCCESS); |
d5aa23e6 SH |
4294 | |
4295 | /* create any missing directories */ | |
b69dfc9f CB |
4296 | tmp = strdup(path); |
4297 | if (!tmp) | |
a7764ce7 | 4298 | _exit(EXIT_FAILURE); |
b69dfc9f CB |
4299 | |
4300 | directory_path = dirname(tmp); | |
4301 | ret = mkdir_p(directory_path, 0755); | |
4302 | if (ret < 0 && errno != EEXIST) { | |
c7d76c09 | 4303 | ERROR("%s - Failed to create path \"%s\"", strerror(errno), directory_path); |
b69dfc9f | 4304 | free(tmp); |
a7764ce7 | 4305 | _exit(EXIT_FAILURE); |
d5aa23e6 SH |
4306 | } |
4307 | ||
4308 | /* create the device node */ | |
b69dfc9f CB |
4309 | ret = mknod(path, st->st_mode, st->st_rdev); |
4310 | free(tmp); | |
c7d76c09 CB |
4311 | if (ret < 0) { |
4312 | ERROR("%s - Failed to create device node at \"%s\"", strerror(errno), path); | |
a7764ce7 | 4313 | _exit(EXIT_FAILURE); |
c7d76c09 | 4314 | } |
d5aa23e6 | 4315 | |
a7764ce7 | 4316 | _exit(EXIT_SUCCESS); |
d5aa23e6 SH |
4317 | } |
4318 | ||
f0ca2726 | 4319 | static bool add_remove_device_node(struct lxc_container *c, const char *src_path, const char *dest_path, bool add) |
a9a0ed90 ÇO |
4320 | { |
4321 | int ret; | |
4322 | struct stat st; | |
238b3e5e | 4323 | char value[LXC_MAX_BUFFER]; |
f0ca2726 | 4324 | const char *p; |
a9a0ed90 ÇO |
4325 | |
4326 | /* make sure container is running */ | |
858377e4 | 4327 | if (!do_lxcapi_is_running(c)) { |
a9a0ed90 | 4328 | ERROR("container is not running"); |
d5aa23e6 | 4329 | return false; |
a9a0ed90 ÇO |
4330 | } |
4331 | ||
4332 | /* use src_path if dest_path is NULL otherwise use dest_path */ | |
4333 | p = dest_path ? dest_path : src_path; | |
4334 | ||
a9a0ed90 ÇO |
4335 | /* make sure we can access p */ |
4336 | if(access(p, F_OK) < 0 || stat(p, &st) < 0) | |
d5aa23e6 | 4337 | return false; |
a9a0ed90 ÇO |
4338 | |
4339 | /* continue if path is character device or block device */ | |
c6a9b0d7 | 4340 | if (S_ISCHR(st.st_mode)) |
238b3e5e | 4341 | ret = snprintf(value, LXC_MAX_BUFFER, "c %d:%d rwm", major(st.st_rdev), minor(st.st_rdev)); |
c6a9b0d7 | 4342 | else if (S_ISBLK(st.st_mode)) |
238b3e5e | 4343 | ret = snprintf(value, LXC_MAX_BUFFER, "b %d:%d rwm", major(st.st_rdev), minor(st.st_rdev)); |
a9a0ed90 | 4344 | else |
d5aa23e6 | 4345 | return false; |
a9a0ed90 ÇO |
4346 | |
4347 | /* check snprintf return code */ | |
238b3e5e | 4348 | if (ret < 0 || ret >= LXC_MAX_BUFFER) |
d5aa23e6 | 4349 | return false; |
a9a0ed90 | 4350 | |
858377e4 | 4351 | if (!do_add_remove_node(do_lxcapi_init_pid(c), p, add, &st)) |
d5aa23e6 | 4352 | return false; |
a9a0ed90 | 4353 | |
d5aa23e6 | 4354 | /* add or remove device to/from cgroup access list */ |
a9a0ed90 | 4355 | if (add) { |
858377e4 | 4356 | if (!do_lxcapi_set_cgroup_item(c, "devices.allow", value)) { |
a9a0ed90 | 4357 | ERROR("set_cgroup_item failed while adding the device node"); |
d5aa23e6 | 4358 | return false; |
a9a0ed90 ÇO |
4359 | } |
4360 | } else { | |
858377e4 | 4361 | if (!do_lxcapi_set_cgroup_item(c, "devices.deny", value)) { |
a9a0ed90 | 4362 | ERROR("set_cgroup_item failed while removing the device node"); |
d5aa23e6 | 4363 | return false; |
a9a0ed90 ÇO |
4364 | } |
4365 | } | |
d5aa23e6 | 4366 | |
a9a0ed90 | 4367 | return true; |
a9a0ed90 ÇO |
4368 | } |
4369 | ||
858377e4 | 4370 | static bool do_lxcapi_add_device_node(struct lxc_container *c, const char *src_path, const char *dest_path) |
a9a0ed90 | 4371 | { |
e0010464 | 4372 | // cannot mknod if we're not privileged wrt init_user_ns |
5384e99d | 4373 | if (am_host_unpriv()) { |
238b3e5e | 4374 | ERROR(LXC_UNPRIV_EOPNOTSUPP, __FUNCTION__); |
c868b261 ÇO |
4375 | return false; |
4376 | } | |
a9a0ed90 ÇO |
4377 | return add_remove_device_node(c, src_path, dest_path, true); |
4378 | } | |
4379 | ||
858377e4 SH |
4380 | WRAP_API_2(bool, lxcapi_add_device_node, const char *, const char *) |
4381 | ||
4382 | static bool do_lxcapi_remove_device_node(struct lxc_container *c, const char *src_path, const char *dest_path) | |
a9a0ed90 | 4383 | { |
e0010464 | 4384 | if (am_guest_unpriv()) { |
238b3e5e | 4385 | ERROR(LXC_UNPRIV_EOPNOTSUPP, __FUNCTION__); |
c868b261 ÇO |
4386 | return false; |
4387 | } | |
a9a0ed90 ÇO |
4388 | return add_remove_device_node(c, src_path, dest_path, false); |
4389 | } | |
4390 | ||
858377e4 SH |
4391 | WRAP_API_2(bool, lxcapi_remove_device_node, const char *, const char *) |
4392 | ||
c7d76c09 CB |
4393 | static bool do_lxcapi_attach_interface(struct lxc_container *c, |
4394 | const char *ifname, | |
4395 | const char *dst_ifname) | |
e58fae8f | 4396 | { |
c7d76c09 | 4397 | pid_t init_pid; |
e58fae8f | 4398 | int ret = 0; |
c7d76c09 | 4399 | |
e0010464 | 4400 | if (am_guest_unpriv()) { |
238b3e5e | 4401 | ERROR(LXC_UNPRIV_EOPNOTSUPP, __FUNCTION__); |
e58fae8f DY |
4402 | return false; |
4403 | } | |
4404 | ||
4405 | if (!ifname) { | |
4406 | ERROR("No source interface name given"); | |
4407 | return false; | |
4408 | } | |
4409 | ||
4410 | ret = lxc_netdev_isup(ifname); | |
e5848d39 SH |
4411 | if (ret > 0) { |
4412 | /* netdev of ifname is up. */ | |
e58fae8f DY |
4413 | ret = lxc_netdev_down(ifname); |
4414 | if (ret) | |
4415 | goto err; | |
4416 | } | |
4417 | ||
c7d76c09 CB |
4418 | init_pid = do_lxcapi_init_pid(c); |
4419 | ret = lxc_netdev_move_by_name(ifname, init_pid, dst_ifname); | |
e58fae8f DY |
4420 | if (ret) |
4421 | goto err; | |
4422 | ||
c7d76c09 | 4423 | INFO("Moved network device \"%s\" to network namespace of %d", ifname, init_pid); |
e58fae8f | 4424 | return true; |
e5848d39 | 4425 | |
e58fae8f | 4426 | err: |
e58fae8f DY |
4427 | return false; |
4428 | } | |
4429 | ||
858377e4 SH |
4430 | WRAP_API_2(bool, lxcapi_attach_interface, const char *, const char *) |
4431 | ||
c7d76c09 CB |
4432 | static bool do_lxcapi_detach_interface(struct lxc_container *c, |
4433 | const char *ifname, | |
4434 | const char *dst_ifname) | |
e58fae8f | 4435 | { |
c7d76c09 | 4436 | int ret; |
e58fae8f DY |
4437 | pid_t pid, pid_outside; |
4438 | ||
e0010464 SH |
4439 | /* |
4440 | * TODO - if this is a physical device, then we need am_host_unpriv. | |
4441 | * But for other types guest privilege suffices. | |
4442 | */ | |
4443 | if (am_guest_unpriv()) { | |
238b3e5e | 4444 | ERROR(LXC_UNPRIV_EOPNOTSUPP, __FUNCTION__); |
e58fae8f DY |
4445 | return false; |
4446 | } | |
4447 | ||
4448 | if (!ifname) { | |
4449 | ERROR("No source interface name given"); | |
4450 | return false; | |
4451 | } | |
4452 | ||
0059379f | 4453 | pid_outside = lxc_raw_getpid(); |
e58fae8f DY |
4454 | pid = fork(); |
4455 | if (pid < 0) { | |
c7d76c09 | 4456 | ERROR("Failed to fork"); |
e58fae8f DY |
4457 | return false; |
4458 | } | |
4459 | ||
1a0e70ac | 4460 | if (pid == 0) { /* child */ |
acbfeda8 CB |
4461 | pid_t init_pid; |
4462 | ||
4463 | init_pid = do_lxcapi_init_pid(c); | |
4464 | if (!switch_to_ns(init_pid, "net")) { | |
4465 | ERROR("Failed to enter network namespace"); | |
8d7b6c25 | 4466 | _exit(EXIT_FAILURE); |
e58fae8f DY |
4467 | } |
4468 | ||
4469 | ret = lxc_netdev_isup(ifname); | |
c7d76c09 CB |
4470 | if (ret < 0) { |
4471 | ERROR("Failed to determine whether network device \"%s\" is up", ifname); | |
8d7b6c25 | 4472 | _exit(EXIT_FAILURE); |
c7d76c09 | 4473 | } |
e58fae8f DY |
4474 | |
4475 | /* netdev of ifname is up. */ | |
4476 | if (ret) { | |
4477 | ret = lxc_netdev_down(ifname); | |
c7d76c09 CB |
4478 | if (ret) { |
4479 | ERROR("Failed to set network device \"%s\" down", ifname); | |
8d7b6c25 | 4480 | _exit(EXIT_FAILURE); |
c7d76c09 | 4481 | } |
e58fae8f DY |
4482 | } |
4483 | ||
4484 | ret = lxc_netdev_move_by_name(ifname, pid_outside, dst_ifname); | |
c7d76c09 CB |
4485 | /* -EINVAL means there is no netdev named as ifname. */ |
4486 | if (ret < 0) { | |
4487 | if (ret == -EINVAL) | |
4488 | ERROR("Network device \"%s\" not found", ifname); | |
4489 | else | |
4490 | ERROR("Failed to remove network device \"%s\"", ifname); | |
8d7b6c25 | 4491 | _exit(EXIT_FAILURE); |
e58fae8f | 4492 | } |
c7d76c09 | 4493 | |
8d7b6c25 | 4494 | _exit(EXIT_SUCCESS); |
e58fae8f DY |
4495 | } |
4496 | ||
c7d76c09 CB |
4497 | ret = wait_for_pid(pid); |
4498 | if (ret != 0) | |
e58fae8f DY |
4499 | return false; |
4500 | ||
c7d76c09 | 4501 | INFO("Moved network device \"%s\" to network namespace of %d", ifname, pid_outside); |
e58fae8f DY |
4502 | return true; |
4503 | } | |
4504 | ||
858377e4 SH |
4505 | WRAP_API_2(bool, lxcapi_detach_interface, const char *, const char *) |
4506 | ||
aef3d51e TA |
4507 | static int do_lxcapi_migrate(struct lxc_container *c, unsigned int cmd, |
4508 | struct migrate_opts *opts, unsigned int size) | |
bbd4e13e | 4509 | { |
6b9be523 | 4510 | int ret = -1; |
2cb80427 | 4511 | struct migrate_opts *valid_opts = opts; |
b5b12b9e | 4512 | uint64_t features_to_check = 0; |
85c50991 | 4513 | |
aef3d51e TA |
4514 | /* If the caller has a bigger (newer) struct migrate_opts, let's make |
4515 | * sure that the stuff on the end is zero, i.e. that they didn't ask us | |
4516 | * to do anything special. | |
4517 | */ | |
4518 | if (size > sizeof(*opts)) { | |
4519 | unsigned char *addr; | |
4520 | unsigned char *end; | |
4521 | ||
4522 | addr = (void *)opts + sizeof(*opts); | |
4523 | end = (void *)opts + size; | |
4524 | for (; addr < end; addr++) { | |
4525 | if (*addr) { | |
4526 | return -E2BIG; | |
4527 | } | |
4528 | } | |
85c50991 TA |
4529 | } |
4530 | ||
2cb80427 TA |
4531 | /* If the caller has a smaller struct, let's zero out the end for them |
4532 | * so we don't accidentally use bits of it that they didn't know about | |
4533 | * to initialize. | |
4534 | */ | |
4535 | if (size < sizeof(*opts)) { | |
4536 | valid_opts = malloc(sizeof(*opts)); | |
4537 | if (!valid_opts) | |
4538 | return -ENOMEM; | |
4539 | ||
4540 | memset(valid_opts, 0, sizeof(*opts)); | |
4541 | memcpy(valid_opts, opts, size); | |
4542 | } | |
4543 | ||
aef3d51e TA |
4544 | switch (cmd) { |
4545 | case MIGRATE_PRE_DUMP: | |
7ad13c91 TA |
4546 | if (!do_lxcapi_is_running(c)) { |
4547 | ERROR("container is not running"); | |
6b9be523 | 4548 | goto on_error; |
7ad13c91 | 4549 | } |
2cb80427 | 4550 | ret = !__criu_pre_dump(c, valid_opts); |
aef3d51e TA |
4551 | break; |
4552 | case MIGRATE_DUMP: | |
7ad13c91 TA |
4553 | if (!do_lxcapi_is_running(c)) { |
4554 | ERROR("container is not running"); | |
6b9be523 | 4555 | goto on_error; |
7ad13c91 | 4556 | } |
2cb80427 | 4557 | ret = !__criu_dump(c, valid_opts); |
aef3d51e TA |
4558 | break; |
4559 | case MIGRATE_RESTORE: | |
7ad13c91 TA |
4560 | if (do_lxcapi_is_running(c)) { |
4561 | ERROR("container is already running"); | |
6b9be523 | 4562 | goto on_error; |
7ad13c91 | 4563 | } |
2cb80427 | 4564 | ret = !__criu_restore(c, valid_opts); |
aef3d51e | 4565 | break; |
b5b12b9e AR |
4566 | case MIGRATE_FEATURE_CHECK: |
4567 | features_to_check = valid_opts->features_to_check; | |
4568 | ret = !__criu_check_feature(&features_to_check); | |
4569 | if (ret) { | |
4570 | /* Something went wrong. Let's let the caller | |
4571 | * know which feature checks failed. */ | |
4572 | valid_opts->features_to_check = features_to_check; | |
4573 | } | |
4574 | break; | |
aef3d51e TA |
4575 | default: |
4576 | ERROR("invalid migrate command %u", cmd); | |
4577 | ret = -EINVAL; | |
4578 | } | |
735f2c6e | 4579 | |
6b9be523 | 4580 | on_error: |
f686506d TA |
4581 | if (size < sizeof(*opts)) |
4582 | free(valid_opts); | |
4583 | ||
aef3d51e TA |
4584 | return ret; |
4585 | } | |
735f2c6e | 4586 | |
aef3d51e | 4587 | WRAP_API_3(int, lxcapi_migrate, unsigned int, struct migrate_opts *, unsigned int) |
735f2c6e | 4588 | |
aef3d51e TA |
4589 | static bool do_lxcapi_checkpoint(struct lxc_container *c, char *directory, bool stop, bool verbose) |
4590 | { | |
ebb088e1 AR |
4591 | struct migrate_opts opts; |
4592 | ||
4593 | memset(&opts, 0, sizeof(opts)); | |
4594 | ||
4595 | opts.directory = directory; | |
4596 | opts.stop = stop; | |
4597 | opts.verbose = verbose; | |
735f2c6e | 4598 | |
aef3d51e | 4599 | return !do_lxcapi_migrate(c, MIGRATE_DUMP, &opts, sizeof(opts)); |
735f2c6e TA |
4600 | } |
4601 | ||
858377e4 SH |
4602 | WRAP_API_3(bool, lxcapi_checkpoint, char *, bool, bool) |
4603 | ||
4604 | static bool do_lxcapi_restore(struct lxc_container *c, char *directory, bool verbose) | |
c9d8f2ee | 4605 | { |
ebb088e1 AR |
4606 | struct migrate_opts opts; |
4607 | ||
4608 | memset(&opts, 0, sizeof(opts)); | |
4609 | ||
4610 | opts.directory = directory; | |
4611 | opts.verbose = verbose; | |
c9d8f2ee | 4612 | |
aef3d51e | 4613 | return !do_lxcapi_migrate(c, MIGRATE_RESTORE, &opts, sizeof(opts)); |
735f2c6e TA |
4614 | } |
4615 | ||
858377e4 SH |
4616 | WRAP_API_2(bool, lxcapi_restore, char *, bool) |
4617 | ||
a0e93eeb CS |
4618 | static int lxcapi_attach_run_waitl(struct lxc_container *c, lxc_attach_options_t *options, const char *program, const char *arg, ...) |
4619 | { | |
4620 | va_list ap; | |
4621 | const char **argv; | |
4622 | int ret; | |
4623 | ||
4624 | if (!c) | |
4625 | return -1; | |
4626 | ||
858377e4 SH |
4627 | current_config = c->lxc_conf; |
4628 | ||
a0e93eeb CS |
4629 | va_start(ap, arg); |
4630 | argv = lxc_va_arg_list_to_argv_const(ap, 1); | |
4631 | va_end(ap); | |
4632 | ||
4633 | if (!argv) { | |
4634 | ERROR("Memory allocation error."); | |
858377e4 SH |
4635 | ret = -1; |
4636 | goto out; | |
a0e93eeb CS |
4637 | } |
4638 | argv[0] = arg; | |
4639 | ||
858377e4 | 4640 | ret = do_lxcapi_attach_run_wait(c, options, program, (const char * const *)argv); |
a0e93eeb | 4641 | free((void*)argv); |
858377e4 SH |
4642 | out: |
4643 | current_config = NULL; | |
a0e93eeb CS |
4644 | return ret; |
4645 | } | |
4646 | ||
afeecbba | 4647 | struct lxc_container *lxc_container_new(const char *name, const char *configpath) |
72d0e1cb SG |
4648 | { |
4649 | struct lxc_container *c; | |
72d0e1cb | 4650 | |
18aa217b SH |
4651 | if (!name) |
4652 | return NULL; | |
4653 | ||
72d0e1cb SG |
4654 | c = malloc(sizeof(*c)); |
4655 | if (!c) { | |
e9e29a33 | 4656 | fprintf(stderr, "Failed to allocate memory for %s\n", name); |
72d0e1cb SG |
4657 | return NULL; |
4658 | } | |
4659 | memset(c, 0, sizeof(*c)); | |
4660 | ||
afeecbba SH |
4661 | if (configpath) |
4662 | c->config_path = strdup(configpath); | |
4663 | else | |
593e8478 | 4664 | c->config_path = strdup(lxc_global_config_value("lxc.lxcpath")); |
afeecbba | 4665 | |
2a59a681 | 4666 | if (!c->config_path) { |
e9e29a33 | 4667 | fprintf(stderr, "Failed to allocate memory for %s\n", name); |
2a59a681 SH |
4668 | goto err; |
4669 | } | |
4670 | ||
f5dd1d53 | 4671 | remove_trailing_slashes(c->config_path); |
72d0e1cb SG |
4672 | c->name = malloc(strlen(name)+1); |
4673 | if (!c->name) { | |
e9e29a33 | 4674 | fprintf(stderr, "Failed to allocate memory for %s\n", name); |
72d0e1cb SG |
4675 | goto err; |
4676 | } | |
4677 | strcpy(c->name, name); | |
4678 | ||
4679 | c->numthreads = 1; | |
e9e29a33 CB |
4680 | c->slock = lxc_newlock(c->config_path, name); |
4681 | if (!c->slock) { | |
4682 | fprintf(stderr, "Failed to create lock for %s\n", name); | |
72d0e1cb SG |
4683 | goto err; |
4684 | } | |
4685 | ||
e9e29a33 CB |
4686 | c->privlock = lxc_newlock(NULL, NULL); |
4687 | if (!c->privlock) { | |
4688 | fprintf(stderr, "Failed to create private lock for %s\n", name); | |
72d0e1cb SG |
4689 | goto err; |
4690 | } | |
4691 | ||
afeecbba | 4692 | if (!set_config_filename(c)) { |
e9e29a33 | 4693 | fprintf(stderr, "Failed to create config file name for %s\n", name); |
72d0e1cb SG |
4694 | goto err; |
4695 | } | |
72d0e1cb | 4696 | |
e9e29a33 CB |
4697 | if (file_exists(c->configfile) && !lxcapi_load_config(c, NULL)) { |
4698 | fprintf(stderr, "Failed to load config for %s\n", name); | |
bac806d1 | 4699 | goto err; |
e9e29a33 | 4700 | } |
72d0e1cb | 4701 | |
3e625e2d | 4702 | if (ongoing_create(c) == 2) { |
e9e29a33 | 4703 | ERROR("Failed to complete container creation for %s", c->name); |
17a367d8 | 4704 | container_destroy(c, NULL); |
4df7f012 | 4705 | lxcapi_clear_config(c); |
3e625e2d | 4706 | } |
a2739df5 | 4707 | c->daemonize = true; |
72cf75fa | 4708 | c->pidfile = NULL; |
3e625e2d | 4709 | |
1a0e70ac | 4710 | /* Assign the member functions. */ |
72d0e1cb SG |
4711 | c->is_defined = lxcapi_is_defined; |
4712 | c->state = lxcapi_state; | |
4713 | c->is_running = lxcapi_is_running; | |
4714 | c->freeze = lxcapi_freeze; | |
4715 | c->unfreeze = lxcapi_unfreeze; | |
0115f8fd | 4716 | c->console = lxcapi_console; |
b5159817 | 4717 | c->console_getfd = lxcapi_console_getfd; |
72d0e1cb SG |
4718 | c->init_pid = lxcapi_init_pid; |
4719 | c->load_config = lxcapi_load_config; | |
4720 | c->want_daemonize = lxcapi_want_daemonize; | |
130a1888 | 4721 | c->want_close_all_fds = lxcapi_want_close_all_fds; |
72d0e1cb SG |
4722 | c->start = lxcapi_start; |
4723 | c->startl = lxcapi_startl; | |
4724 | c->stop = lxcapi_stop; | |
4725 | c->config_file_name = lxcapi_config_file_name; | |
4726 | c->wait = lxcapi_wait; | |
4727 | c->set_config_item = lxcapi_set_config_item; | |
4728 | c->destroy = lxcapi_destroy; | |
18aa217b | 4729 | c->destroy_with_snapshots = lxcapi_destroy_with_snapshots; |
06e5650e | 4730 | c->rename = lxcapi_rename; |
72d0e1cb SG |
4731 | c->save_config = lxcapi_save_config; |
4732 | c->get_keys = lxcapi_get_keys; | |
4733 | c->create = lxcapi_create; | |
4734 | c->createl = lxcapi_createl; | |
4735 | c->shutdown = lxcapi_shutdown; | |
3e625e2d | 4736 | c->reboot = lxcapi_reboot; |
d39b10eb | 4737 | c->reboot2 = lxcapi_reboot2; |
4df7f012 | 4738 | c->clear_config = lxcapi_clear_config; |
72d0e1cb SG |
4739 | c->clear_config_item = lxcapi_clear_config_item; |
4740 | c->get_config_item = lxcapi_get_config_item; | |
8ac18377 | 4741 | c->get_running_config_item = lxcapi_get_running_config_item; |
794dd120 SH |
4742 | c->get_cgroup_item = lxcapi_get_cgroup_item; |
4743 | c->set_cgroup_item = lxcapi_set_cgroup_item; | |
2a59a681 SH |
4744 | c->get_config_path = lxcapi_get_config_path; |
4745 | c->set_config_path = lxcapi_set_config_path; | |
9be53773 | 4746 | c->clone = lxcapi_clone; |
799f29ab | 4747 | c->get_interfaces = lxcapi_get_interfaces; |
9c83a661 | 4748 | c->get_ips = lxcapi_get_ips; |
a0e93eeb CS |
4749 | c->attach = lxcapi_attach; |
4750 | c->attach_run_wait = lxcapi_attach_run_wait; | |
4751 | c->attach_run_waitl = lxcapi_attach_run_waitl; | |
f5dd1d53 SH |
4752 | c->snapshot = lxcapi_snapshot; |
4753 | c->snapshot_list = lxcapi_snapshot_list; | |
4754 | c->snapshot_restore = lxcapi_snapshot_restore; | |
771d96b3 | 4755 | c->snapshot_destroy = lxcapi_snapshot_destroy; |
18aa217b | 4756 | c->snapshot_destroy_all = lxcapi_snapshot_destroy_all; |
b494d2dd | 4757 | c->may_control = lxcapi_may_control; |
a9a0ed90 ÇO |
4758 | c->add_device_node = lxcapi_add_device_node; |
4759 | c->remove_device_node = lxcapi_remove_device_node; | |
e58fae8f DY |
4760 | c->attach_interface = lxcapi_attach_interface; |
4761 | c->detach_interface = lxcapi_detach_interface; | |
735f2c6e TA |
4762 | c->checkpoint = lxcapi_checkpoint; |
4763 | c->restore = lxcapi_restore; | |
aef3d51e | 4764 | c->migrate = lxcapi_migrate; |
191d43cc | 4765 | c->console_log = lxcapi_console_log; |
72d0e1cb | 4766 | |
72d0e1cb SG |
4767 | return c; |
4768 | ||
4769 | err: | |
4770 | lxc_container_free(c); | |
4771 | return NULL; | |
4772 | } | |
4773 | ||
4a7c7daa | 4774 | int lxc_get_wait_states(const char **states) |
72d0e1cb SG |
4775 | { |
4776 | int i; | |
4777 | ||
4778 | if (states) | |
4779 | for (i=0; i<MAX_STATE; i++) | |
4780 | states[i] = lxc_state2str(i); | |
4781 | return MAX_STATE; | |
4782 | } | |
a41f104b | 4783 | |
a41f104b SH |
4784 | /* |
4785 | * These next two could probably be done smarter with reusing a common function | |
4786 | * with different iterators and tests... | |
4787 | */ | |
4788 | int list_defined_containers(const char *lxcpath, char ***names, struct lxc_container ***cret) | |
4789 | { | |
4790 | DIR *dir; | |
4791 | int i, cfound = 0, nfound = 0; | |
74f96976 | 4792 | struct dirent *direntp; |
a41f104b SH |
4793 | struct lxc_container *c; |
4794 | ||
4795 | if (!lxcpath) | |
593e8478 | 4796 | lxcpath = lxc_global_config_value("lxc.lxcpath"); |
a41f104b | 4797 | |
a41f104b | 4798 | dir = opendir(lxcpath); |
a41f104b SH |
4799 | if (!dir) { |
4800 | SYSERROR("opendir on lxcpath"); | |
4801 | return -1; | |
4802 | } | |
4803 | ||
4804 | if (cret) | |
4805 | *cret = NULL; | |
4806 | if (names) | |
4807 | *names = NULL; | |
4808 | ||
74f96976 | 4809 | while ((direntp = readdir(dir))) { |
a41f104b SH |
4810 | if (!direntp) |
4811 | break; | |
e4ebeab1 | 4812 | |
1a0e70ac | 4813 | /* Ignore '.', '..' and any hidden directory. */ |
e4ebeab1 | 4814 | if (!strncmp(direntp->d_name, ".", 1)) |
a41f104b SH |
4815 | continue; |
4816 | ||
4817 | if (!config_file_exists(lxcpath, direntp->d_name)) | |
4818 | continue; | |
4819 | ||
4820 | if (names) { | |
9c88ff1f | 4821 | if (!add_to_array(names, direntp->d_name, cfound)) |
a41f104b SH |
4822 | goto free_bad; |
4823 | } | |
4824 | cfound++; | |
4825 | ||
4826 | if (!cret) { | |
4827 | nfound++; | |
4828 | continue; | |
4829 | } | |
4830 | ||
4831 | c = lxc_container_new(direntp->d_name, lxcpath); | |
4832 | if (!c) { | |
4833 | INFO("Container %s:%s has a config but could not be loaded", | |
4834 | lxcpath, direntp->d_name); | |
4835 | if (names) | |
9c88ff1f ÇO |
4836 | if(!remove_from_array(names, direntp->d_name, cfound--)) |
4837 | goto free_bad; | |
a41f104b SH |
4838 | continue; |
4839 | } | |
858377e4 | 4840 | if (!do_lxcapi_is_defined(c)) { |
a41f104b SH |
4841 | INFO("Container %s:%s has a config but is not defined", |
4842 | lxcpath, direntp->d_name); | |
4843 | if (names) | |
9c88ff1f ÇO |
4844 | if(!remove_from_array(names, direntp->d_name, cfound--)) |
4845 | goto free_bad; | |
a41f104b SH |
4846 | lxc_container_put(c); |
4847 | continue; | |
4848 | } | |
4849 | ||
2871830a | 4850 | if (!add_to_clist(cret, c, nfound, true)) { |
a41f104b SH |
4851 | lxc_container_put(c); |
4852 | goto free_bad; | |
4853 | } | |
4854 | nfound++; | |
4855 | } | |
4856 | ||
a41f104b | 4857 | closedir(dir); |
a41f104b SH |
4858 | return nfound; |
4859 | ||
4860 | free_bad: | |
4861 | if (names && *names) { | |
4862 | for (i=0; i<cfound; i++) | |
4863 | free((*names)[i]); | |
4864 | free(*names); | |
4865 | } | |
4866 | if (cret && *cret) { | |
4867 | for (i=0; i<nfound; i++) | |
4868 | lxc_container_put((*cret)[i]); | |
4869 | free(*cret); | |
4870 | } | |
a41f104b | 4871 | closedir(dir); |
a41f104b SH |
4872 | return -1; |
4873 | } | |
4874 | ||
148a9d27 DE |
4875 | int list_active_containers(const char *lxcpath, char ***nret, |
4876 | struct lxc_container ***cret) | |
a41f104b | 4877 | { |
148a9d27 | 4878 | int i, ret = -1, cret_cnt = 0, ct_name_cnt = 0; |
a41f104b SH |
4879 | int lxcpath_len; |
4880 | char *line = NULL; | |
148a9d27 | 4881 | char **ct_name = NULL; |
a41f104b | 4882 | size_t len = 0; |
97bc2422 | 4883 | struct lxc_container *c = NULL; |
88556fd7 | 4884 | bool is_hashed; |
a41f104b SH |
4885 | |
4886 | if (!lxcpath) | |
593e8478 | 4887 | lxcpath = lxc_global_config_value("lxc.lxcpath"); |
a41f104b SH |
4888 | lxcpath_len = strlen(lxcpath); |
4889 | ||
4890 | if (cret) | |
4891 | *cret = NULL; | |
148a9d27 DE |
4892 | if (nret) |
4893 | *nret = NULL; | |
a41f104b | 4894 | |
a41f104b | 4895 | FILE *f = fopen("/proc/net/unix", "r"); |
a41f104b SH |
4896 | if (!f) |
4897 | return -1; | |
4898 | ||
4899 | while (getline(&line, &len, f) != -1) { | |
88556fd7 | 4900 | |
0f8f9c8a | 4901 | char *p = strrchr(line, ' '), *p2; |
a41f104b SH |
4902 | if (!p) |
4903 | continue; | |
4904 | p++; | |
4905 | if (*p != 0x40) | |
4906 | continue; | |
4907 | p++; | |
88556fd7 ÇO |
4908 | |
4909 | is_hashed = false; | |
4910 | if (strncmp(p, lxcpath, lxcpath_len) == 0) { | |
4911 | p += lxcpath_len; | |
4912 | } else if (strncmp(p, "lxc/", 4) == 0) { | |
4913 | p += 4; | |
4914 | is_hashed = true; | |
4915 | } else { | |
a41f104b | 4916 | continue; |
88556fd7 ÇO |
4917 | } |
4918 | ||
a41f104b SH |
4919 | while (*p == '/') |
4920 | p++; | |
4921 | ||
1a0e70ac | 4922 | /* Now p is the start of lxc_name. */ |
46cd2845 | 4923 | p2 = strchr(p, '/'); |
a41f104b SH |
4924 | if (!p2 || strncmp(p2, "/command", 8) != 0) |
4925 | continue; | |
4926 | *p2 = '\0'; | |
4927 | ||
88556fd7 | 4928 | if (is_hashed) { |
899a9f55 CB |
4929 | char *recvpath = lxc_cmd_get_lxcpath(p); |
4930 | if (!recvpath) | |
4931 | continue; | |
4932 | if (strncmp(lxcpath, recvpath, lxcpath_len) != 0) | |
88556fd7 ÇO |
4933 | continue; |
4934 | p = lxc_cmd_get_name(p); | |
ee2d7093 L |
4935 | if (!p) |
4936 | continue; | |
88556fd7 ÇO |
4937 | } |
4938 | ||
148a9d27 | 4939 | if (array_contains(&ct_name, p, ct_name_cnt)) |
9c88ff1f ÇO |
4940 | continue; |
4941 | ||
148a9d27 DE |
4942 | if (!add_to_array(&ct_name, p, ct_name_cnt)) |
4943 | goto free_cret_list; | |
9c88ff1f | 4944 | |
148a9d27 | 4945 | ct_name_cnt++; |
a41f104b | 4946 | |
148a9d27 | 4947 | if (!cret) |
a41f104b | 4948 | continue; |
a41f104b SH |
4949 | |
4950 | c = lxc_container_new(p, lxcpath); | |
4951 | if (!c) { | |
4952 | INFO("Container %s:%s is running but could not be loaded", | |
4953 | lxcpath, p); | |
148a9d27 | 4954 | remove_from_array(&ct_name, p, ct_name_cnt--); |
a41f104b SH |
4955 | continue; |
4956 | } | |
4957 | ||
4958 | /* | |
4959 | * If this is an anonymous container, then is_defined *can* | |
4960 | * return false. So we don't do that check. Count on the | |
4961 | * fact that the command socket exists. | |
4962 | */ | |
4963 | ||
148a9d27 | 4964 | if (!add_to_clist(cret, c, cret_cnt, true)) { |
a41f104b | 4965 | lxc_container_put(c); |
148a9d27 | 4966 | goto free_cret_list; |
a41f104b | 4967 | } |
148a9d27 | 4968 | cret_cnt++; |
a41f104b SH |
4969 | } |
4970 | ||
97bc2422 CB |
4971 | if (nret && cret && cret_cnt != ct_name_cnt) { |
4972 | if (c) | |
4973 | lxc_container_put(c); | |
4974 | goto free_cret_list; | |
4975 | } | |
4976 | ||
148a9d27 DE |
4977 | ret = ct_name_cnt; |
4978 | if (nret) | |
4979 | *nret = ct_name; | |
4980 | else | |
4981 | goto free_ct_name; | |
4982 | goto out; | |
a41f104b | 4983 | |
148a9d27 | 4984 | free_cret_list: |
a41f104b | 4985 | if (cret && *cret) { |
148a9d27 | 4986 | for (i = 0; i < cret_cnt; i++) |
a41f104b SH |
4987 | lxc_container_put((*cret)[i]); |
4988 | free(*cret); | |
4989 | } | |
148a9d27 DE |
4990 | |
4991 | free_ct_name: | |
4992 | if (ct_name) { | |
4993 | for (i = 0; i < ct_name_cnt; i++) | |
4994 | free(ct_name[i]); | |
4995 | free(ct_name); | |
4996 | } | |
4997 | ||
4998 | out: | |
f10fad2f | 4999 | free(line); |
e853a32d | 5000 | |
a41f104b | 5001 | fclose(f); |
148a9d27 | 5002 | return ret; |
a41f104b | 5003 | } |
2871830a DE |
5004 | |
5005 | int list_all_containers(const char *lxcpath, char ***nret, | |
5006 | struct lxc_container ***cret) | |
5007 | { | |
5008 | int i, ret, active_cnt, ct_cnt, ct_list_cnt; | |
5009 | char **active_name; | |
5010 | char **ct_name; | |
5011 | struct lxc_container **ct_list = NULL; | |
5012 | ||
5013 | ct_cnt = list_defined_containers(lxcpath, &ct_name, NULL); | |
5014 | if (ct_cnt < 0) | |
5015 | return ct_cnt; | |
5016 | ||
5017 | active_cnt = list_active_containers(lxcpath, &active_name, NULL); | |
5018 | if (active_cnt < 0) { | |
5019 | ret = active_cnt; | |
5020 | goto free_ct_name; | |
5021 | } | |
5022 | ||
5023 | for (i = 0; i < active_cnt; i++) { | |
5024 | if (!array_contains(&ct_name, active_name[i], ct_cnt)) { | |
5025 | if (!add_to_array(&ct_name, active_name[i], ct_cnt)) { | |
5026 | ret = -1; | |
5027 | goto free_active_name; | |
5028 | } | |
5029 | ct_cnt++; | |
5030 | } | |
5031 | free(active_name[i]); | |
5032 | active_name[i] = NULL; | |
5033 | } | |
5034 | free(active_name); | |
5035 | active_name = NULL; | |
5036 | active_cnt = 0; | |
5037 | ||
5038 | for (i = 0, ct_list_cnt = 0; i < ct_cnt && cret; i++) { | |
5039 | struct lxc_container *c; | |
5040 | ||
5041 | c = lxc_container_new(ct_name[i], lxcpath); | |
5042 | if (!c) { | |
5043 | WARN("Container %s:%s could not be loaded", lxcpath, ct_name[i]); | |
5044 | remove_from_array(&ct_name, ct_name[i], ct_cnt--); | |
5045 | continue; | |
5046 | } | |
5047 | ||
5048 | if (!add_to_clist(&ct_list, c, ct_list_cnt, false)) { | |
5049 | lxc_container_put(c); | |
5050 | ret = -1; | |
5051 | goto free_ct_list; | |
5052 | } | |
5053 | ct_list_cnt++; | |
5054 | } | |
5055 | ||
5056 | if (cret) | |
5057 | *cret = ct_list; | |
5058 | ||
5059 | if (nret) | |
5060 | *nret = ct_name; | |
5061 | else { | |
5062 | ret = ct_cnt; | |
5063 | goto free_ct_name; | |
5064 | } | |
5065 | return ct_cnt; | |
5066 | ||
5067 | free_ct_list: | |
5068 | for (i = 0; i < ct_list_cnt; i++) { | |
5069 | lxc_container_put(ct_list[i]); | |
5070 | } | |
f10fad2f | 5071 | free(ct_list); |
2871830a DE |
5072 | |
5073 | free_active_name: | |
5074 | for (i = 0; i < active_cnt; i++) { | |
f10fad2f | 5075 | free(active_name[i]); |
2871830a | 5076 | } |
f10fad2f | 5077 | free(active_name); |
2871830a DE |
5078 | |
5079 | free_ct_name: | |
5080 | for (i = 0; i < ct_cnt; i++) { | |
5081 | free(ct_name[i]); | |
5082 | } | |
5083 | free(ct_name); | |
5084 | return ret; | |
5085 | } | |
12461428 CB |
5086 | |
5087 | bool lxc_config_item_is_supported(const char *key) | |
5088 | { | |
300df83e | 5089 | return !!lxc_get_config(key); |
12461428 | 5090 | } |