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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 | * | |
6 | * This program is free software; you can redistribute it and/or modify | |
7 | * it under the terms of the GNU General Public License version 2, as | |
8 | * published by the Free Software Foundation. | |
9 | * | |
10 | * This program is distributed in the hope that it will be useful, | |
11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
13 | * GNU General Public License for more details. | |
14 | * | |
15 | * You should have received a copy of the GNU General Public License along | |
16 | * with this program; if not, write to the Free Software Foundation, Inc., | |
17 | * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. | |
18 | */ | |
19 | ||
9be53773 | 20 | #define _GNU_SOURCE |
71454076 | 21 | #include <pthread.h> |
9be53773 SH |
22 | #include <unistd.h> |
23 | #include <sys/types.h> | |
24 | #include <sys/wait.h> | |
25 | #include <errno.h> | |
26 | #include <sched.h> | |
27 | #include "config.h" | |
72d0e1cb SG |
28 | #include "lxc.h" |
29 | #include "state.h" | |
30 | #include "lxccontainer.h" | |
31 | #include "conf.h" | |
72d0e1cb SG |
32 | #include "confile.h" |
33 | #include "cgroup.h" | |
34 | #include "commands.h" | |
b6b918a1 | 35 | #include "version.h" |
72d0e1cb | 36 | #include "log.h" |
9be53773 | 37 | #include "bdev.h" |
6a44839f | 38 | #include "utils.h" |
2a59a681 | 39 | #include <lxc/utils.h> |
e51d4895 | 40 | #include <lxc/monitor.h> |
9c83a661 SG |
41 | #include <sched.h> |
42 | #include <fcntl.h> | |
43 | #include <arpa/inet.h> | |
44 | #include <ifaddrs.h> | |
72d0e1cb SG |
45 | |
46 | lxc_log_define(lxc_container, lxc); | |
47 | ||
3e625e2d SH |
48 | static bool file_exists(char *f) |
49 | { | |
50 | struct stat statbuf; | |
51 | ||
52 | return stat(f, &statbuf) == 0; | |
53 | } | |
54 | ||
55 | /* | |
56 | * A few functions to help detect when a container creation failed. | |
57 | * If a container creation was killed partway through, then trying | |
58 | * to actually start that container could harm the host. We detect | |
59 | * this by creating a 'partial' file under the container directory, | |
60 | * and keeping an advisory lock. When container creation completes, | |
61 | * we remove that file. When we load or try to start a container, if | |
62 | * we find that file, without a flock, we remove the container. | |
63 | */ | |
64 | int ongoing_create(struct lxc_container *c) | |
65 | { | |
66 | int len = strlen(c->config_path) + strlen(c->name) + 10; | |
67 | char *path = alloca(len); | |
68 | int fd, ret; | |
69 | ret = snprintf(path, len, "%s/%s/partial", c->config_path, c->name); | |
70 | if (ret < 0 || ret >= len) { | |
71 | ERROR("Error writing partial pathname"); | |
72 | return -1; | |
73 | } | |
74 | ||
75 | if (!file_exists(path)) | |
76 | return 0; | |
77 | if (process_lock()) | |
78 | return -1; | |
79 | if ((fd = open(path, O_RDWR)) < 0) { | |
80 | // give benefit of the doubt | |
81 | SYSERROR("Error opening partial file"); | |
82 | process_unlock(); | |
83 | return 0; | |
84 | } | |
85 | if ((ret = flock(fd, LOCK_EX | LOCK_NB)) == -1 && | |
86 | errno == EWOULDBLOCK) { | |
87 | // create is still ongoing | |
88 | close(fd); | |
89 | process_unlock(); | |
90 | return 1; | |
91 | } | |
92 | // create completed but partial is still there. | |
93 | close(fd); | |
94 | process_unlock(); | |
95 | return 2; | |
96 | } | |
97 | ||
98 | int create_partial(struct lxc_container *c) | |
99 | { | |
100 | // $lxcpath + '/' + $name + '/partial' + \0 | |
101 | int len = strlen(c->config_path) + strlen(c->name) + 10; | |
102 | char *path = alloca(len); | |
103 | int fd, ret; | |
104 | ret = snprintf(path, len, "%s/%s/partial", c->config_path, c->name); | |
105 | if (ret < 0 || ret >= len) { | |
106 | ERROR("Error writing partial pathname"); | |
107 | return -1; | |
108 | } | |
1897e3bc | 109 | if (process_lock()) |
3e625e2d SH |
110 | return -1; |
111 | if ((fd=open(path, O_CREAT | O_EXCL, 0755)) < 0) { | |
112 | SYSERROR("Erorr creating partial file"); | |
113 | process_unlock(); | |
114 | return -1; | |
115 | } | |
116 | if (flock(fd, LOCK_EX) < 0) { | |
117 | SYSERROR("Error locking partial file %s", path); | |
118 | close(fd); | |
119 | process_unlock(); | |
120 | return -1; | |
121 | } | |
122 | process_unlock(); | |
123 | ||
124 | return fd; | |
125 | } | |
126 | ||
127 | void remove_partial(struct lxc_container *c, int fd) | |
128 | { | |
129 | // $lxcpath + '/' + $name + '/partial' + \0 | |
130 | int len = strlen(c->config_path) + strlen(c->name) + 10; | |
131 | char *path = alloca(len); | |
132 | int ret; | |
133 | ||
134 | close(fd); | |
135 | ret = snprintf(path, len, "%s/%s/partial", c->config_path, c->name); | |
136 | if (ret < 0 || ret >= len) { | |
137 | ERROR("Error writing partial pathname"); | |
138 | return; | |
139 | } | |
140 | if (process_lock()) | |
141 | return; | |
142 | if (unlink(path) < 0) | |
143 | SYSERROR("Error unlink partial file %s", path); | |
144 | process_unlock(); | |
145 | } | |
146 | ||
72d0e1cb | 147 | /* LOCKING |
3bc449ed SH |
148 | * 1. container_mem_lock(c) protects the struct lxc_container from multiple threads. |
149 | * 2. container_disk_lock(c) protects the on-disk container data - in particular the | |
150 | * container configuration file. | |
151 | * The container_disk_lock also takes the container_mem_lock. | |
152 | * 3. thread_mutex protects process data (ex: fd table) from multiple threads. | |
72d0e1cb SG |
153 | * NOTHING mutexes two independent programs with their own struct |
154 | * lxc_container for the same c->name, between API calls. For instance, | |
155 | * c->config_read(); c->start(); Between those calls, data on disk | |
156 | * could change (which shouldn't bother the caller unless for instance | |
157 | * the rootfs get moved). c->config_read(); update; c->config_write(); | |
158 | * Two such updaters could race. The callers should therefore check their | |
159 | * results. Trying to prevent that would necessarily expose us to deadlocks | |
160 | * due to hung callers. So I prefer to keep the locks only within our own | |
161 | * functions, not across functions. | |
162 | * | |
3bc449ed | 163 | * If you're going to clone while holding a lxccontainer, increment |
72d0e1cb SG |
164 | * c->numthreads (under privlock) before forking. When deleting, |
165 | * decrement numthreads under privlock, then if it hits 0 you can delete. | |
166 | * Do not ever use a lxccontainer whose numthreads you did not bump. | |
167 | */ | |
168 | ||
169 | static void lxc_container_free(struct lxc_container *c) | |
170 | { | |
171 | if (!c) | |
172 | return; | |
173 | ||
174 | if (c->configfile) { | |
175 | free(c->configfile); | |
176 | c->configfile = NULL; | |
177 | } | |
178 | if (c->error_string) { | |
179 | free(c->error_string); | |
180 | c->error_string = NULL; | |
181 | } | |
d95db067 | 182 | if (c->slock) { |
df271a59 | 183 | lxc_putlock(c->slock); |
d95db067 DE |
184 | c->slock = NULL; |
185 | } | |
72d0e1cb | 186 | if (c->privlock) { |
df271a59 | 187 | lxc_putlock(c->privlock); |
72d0e1cb SG |
188 | c->privlock = NULL; |
189 | } | |
190 | if (c->name) { | |
191 | free(c->name); | |
192 | c->name = NULL; | |
193 | } | |
d95db067 DE |
194 | if (c->lxc_conf) { |
195 | lxc_conf_free(c->lxc_conf); | |
196 | c->lxc_conf = NULL; | |
197 | } | |
2a59a681 SH |
198 | if (c->config_path) { |
199 | free(c->config_path); | |
200 | c->config_path = NULL; | |
201 | } | |
72d0e1cb SG |
202 | free(c); |
203 | } | |
204 | ||
43d1aa34 SH |
205 | /* |
206 | * Consider the following case: | |
207 | freer | racing get()er | |
208 | ================================================================== | |
209 | lxc_container_put() | lxc_container_get() | |
210 | \ lxclock(c->privlock) | c->numthreads < 1? (no) | |
211 | \ c->numthreads = 0 | \ lxclock(c->privlock) -> waits | |
212 | \ lxcunlock() | \ | |
213 | \ lxc_container_free() | \ lxclock() returns | |
214 | | \ c->numthreads < 1 -> return 0 | |
215 | \ \ (free stuff) | | |
216 | \ \ sem_destroy(privlock) | | |
217 | ||
218 | * When the get()er checks numthreads the first time, one of the following | |
219 | * is true: | |
220 | * 1. freer has set numthreads = 0. get() returns 0 | |
221 | * 2. freer is between lxclock and setting numthreads to 0. get()er will | |
222 | * sem_wait on privlock, get lxclock after freer() drops it, then see | |
223 | * numthreads is 0 and exit without touching lxclock again.. | |
224 | * 3. freer has not yet locked privlock. If get()er runs first, then put()er | |
225 | * will see --numthreads = 1 and not call lxc_container_free(). | |
226 | */ | |
227 | ||
72d0e1cb SG |
228 | int lxc_container_get(struct lxc_container *c) |
229 | { | |
230 | if (!c) | |
231 | return 0; | |
232 | ||
43d1aa34 SH |
233 | // if someone else has already started freeing the container, don't |
234 | // try to take the lock, which may be invalid | |
235 | if (c->numthreads < 1) | |
236 | return 0; | |
237 | ||
5cee8c50 | 238 | if (container_mem_lock(c)) |
72d0e1cb SG |
239 | return 0; |
240 | if (c->numthreads < 1) { | |
241 | // bail without trying to unlock, bc the privlock is now probably | |
242 | // in freed memory | |
243 | return 0; | |
244 | } | |
245 | c->numthreads++; | |
5cee8c50 | 246 | container_mem_unlock(c); |
72d0e1cb SG |
247 | return 1; |
248 | } | |
249 | ||
250 | int lxc_container_put(struct lxc_container *c) | |
251 | { | |
252 | if (!c) | |
253 | return -1; | |
5cee8c50 | 254 | if (container_mem_lock(c)) |
72d0e1cb SG |
255 | return -1; |
256 | if (--c->numthreads < 1) { | |
5cee8c50 | 257 | container_mem_unlock(c); |
72d0e1cb SG |
258 | lxc_container_free(c); |
259 | return 1; | |
260 | } | |
5cee8c50 | 261 | container_mem_unlock(c); |
72d0e1cb SG |
262 | return 0; |
263 | } | |
264 | ||
72d0e1cb SG |
265 | static bool lxcapi_is_defined(struct lxc_container *c) |
266 | { | |
267 | struct stat statbuf; | |
268 | bool ret = false; | |
269 | int statret; | |
270 | ||
271 | if (!c) | |
272 | return false; | |
273 | ||
5cee8c50 | 274 | if (container_mem_lock(c)) |
72d0e1cb SG |
275 | return false; |
276 | if (!c->configfile) | |
277 | goto out; | |
278 | statret = stat(c->configfile, &statbuf); | |
279 | if (statret != 0) | |
280 | goto out; | |
281 | ret = true; | |
282 | ||
283 | out: | |
5cee8c50 | 284 | container_mem_unlock(c); |
72d0e1cb SG |
285 | return ret; |
286 | } | |
287 | ||
288 | static const char *lxcapi_state(struct lxc_container *c) | |
289 | { | |
72d0e1cb SG |
290 | lxc_state_t s; |
291 | ||
292 | if (!c) | |
293 | return NULL; | |
13f5be62 | 294 | s = lxc_getstate(c->name, c->config_path); |
39dc698c | 295 | return lxc_state2str(s); |
72d0e1cb SG |
296 | } |
297 | ||
39dc698c | 298 | static bool is_stopped(struct lxc_container *c) |
794dd120 SH |
299 | { |
300 | lxc_state_t s; | |
13f5be62 | 301 | s = lxc_getstate(c->name, c->config_path); |
794dd120 SH |
302 | return (s == STOPPED); |
303 | } | |
304 | ||
72d0e1cb SG |
305 | static bool lxcapi_is_running(struct lxc_container *c) |
306 | { | |
307 | const char *s; | |
308 | ||
309 | if (!c) | |
310 | return false; | |
311 | s = lxcapi_state(c); | |
312 | if (!s || strcmp(s, "STOPPED") == 0) | |
313 | return false; | |
314 | return true; | |
315 | } | |
316 | ||
317 | static bool lxcapi_freeze(struct lxc_container *c) | |
318 | { | |
319 | int ret; | |
320 | if (!c) | |
321 | return false; | |
322 | ||
9123e471 | 323 | ret = lxc_freeze(c->name, c->config_path); |
72d0e1cb SG |
324 | if (ret) |
325 | return false; | |
326 | return true; | |
327 | } | |
328 | ||
329 | static bool lxcapi_unfreeze(struct lxc_container *c) | |
330 | { | |
331 | int ret; | |
332 | if (!c) | |
333 | return false; | |
334 | ||
9123e471 | 335 | ret = lxc_unfreeze(c->name, c->config_path); |
72d0e1cb SG |
336 | if (ret) |
337 | return false; | |
338 | return true; | |
339 | } | |
340 | ||
0115f8fd DE |
341 | static int lxcapi_console(struct lxc_container *c, int *ttynum, int *masterfd) |
342 | { | |
343 | int ttyfd; | |
344 | if (!c) | |
345 | return -1; | |
346 | ||
347 | ttyfd = lxc_cmd_console(c->name, ttynum, masterfd, c->config_path); | |
348 | return ttyfd; | |
349 | } | |
350 | ||
72d0e1cb SG |
351 | static pid_t lxcapi_init_pid(struct lxc_container *c) |
352 | { | |
72d0e1cb SG |
353 | if (!c) |
354 | return -1; | |
355 | ||
5cee8c50 | 356 | return lxc_cmd_get_init_pid(c->name, c->config_path); |
72d0e1cb SG |
357 | } |
358 | ||
12a50cc6 | 359 | static bool load_config_locked(struct lxc_container *c, const char *fname) |
8eb5694b SH |
360 | { |
361 | if (!c->lxc_conf) | |
362 | c->lxc_conf = lxc_conf_init(); | |
363 | if (c->lxc_conf && !lxc_config_read(fname, c->lxc_conf)) | |
364 | return true; | |
365 | return false; | |
366 | } | |
367 | ||
12a50cc6 | 368 | static bool lxcapi_load_config(struct lxc_container *c, const char *alt_file) |
72d0e1cb | 369 | { |
39dc698c SH |
370 | bool ret = false, need_disklock = false; |
371 | int lret; | |
12a50cc6 | 372 | const char *fname; |
72d0e1cb SG |
373 | if (!c) |
374 | return false; | |
375 | ||
376 | fname = c->configfile; | |
377 | if (alt_file) | |
378 | fname = alt_file; | |
379 | if (!fname) | |
380 | return false; | |
39dc698c SH |
381 | /* |
382 | * If we're reading something other than the container's config, | |
383 | * we only need to lock the in-memory container. If loading the | |
384 | * container's config file, take the disk lock. | |
385 | */ | |
386 | if (strcmp(fname, c->configfile) == 0) | |
387 | need_disklock = true; | |
388 | ||
389 | if (need_disklock) | |
390 | lret = container_disk_lock(c); | |
391 | else | |
392 | lret = container_mem_lock(c); | |
393 | if (lret) | |
72d0e1cb | 394 | return false; |
39dc698c | 395 | |
8eb5694b | 396 | ret = load_config_locked(c, fname); |
39dc698c SH |
397 | |
398 | if (need_disklock) | |
399 | container_disk_unlock(c); | |
400 | else | |
401 | container_mem_unlock(c); | |
72d0e1cb SG |
402 | return ret; |
403 | } | |
404 | ||
405 | static void lxcapi_want_daemonize(struct lxc_container *c) | |
406 | { | |
407 | if (!c) | |
408 | return; | |
3bc449ed SH |
409 | if (!container_mem_lock(c)) { |
410 | ERROR("Error getting mem lock"); | |
411 | return; | |
412 | } | |
72d0e1cb | 413 | c->daemonize = 1; |
3bc449ed | 414 | container_mem_unlock(c); |
72d0e1cb SG |
415 | } |
416 | ||
12a50cc6 | 417 | static bool lxcapi_wait(struct lxc_container *c, const char *state, int timeout) |
7a44c8b4 SG |
418 | { |
419 | int ret; | |
420 | ||
421 | if (!c) | |
422 | return false; | |
423 | ||
67e571de | 424 | ret = lxc_wait(c->name, state, timeout, c->config_path); |
7a44c8b4 SG |
425 | return ret == 0; |
426 | } | |
427 | ||
428 | ||
429 | static bool wait_on_daemonized_start(struct lxc_container *c) | |
430 | { | |
431 | /* we'll probably want to make this timeout configurable? */ | |
697fa639 | 432 | int timeout = 5, ret, status; |
7a44c8b4 | 433 | |
697fa639 SH |
434 | /* |
435 | * our child is going to fork again, then exit. reap the | |
436 | * child | |
437 | */ | |
438 | ret = wait(&status); | |
439 | if (ret == -1 || !WIFEXITED(status) || WEXITSTATUS(status) != 0) | |
440 | DEBUG("failed waiting for first dual-fork child"); | |
7a44c8b4 SG |
441 | return lxcapi_wait(c, "RUNNING", timeout); |
442 | } | |
443 | ||
72d0e1cb SG |
444 | /* |
445 | * I can't decide if it'd be more convenient for callers if we accept '...', | |
446 | * or a null-terminated array (i.e. execl vs execv) | |
447 | */ | |
12a50cc6 | 448 | static bool lxcapi_start(struct lxc_container *c, int useinit, char * const argv[]) |
72d0e1cb SG |
449 | { |
450 | int ret; | |
451 | struct lxc_conf *conf; | |
452 | int daemonize = 0; | |
453 | char *default_args[] = { | |
454 | "/sbin/init", | |
455 | '\0', | |
456 | }; | |
457 | ||
458 | /* container exists */ | |
459 | if (!c) | |
460 | return false; | |
461 | /* container has been setup */ | |
462 | if (!c->lxc_conf) | |
463 | return false; | |
464 | ||
3e625e2d SH |
465 | if ((ret = ongoing_create(c)) < 0) { |
466 | ERROR("Error checking for incomplete creation"); | |
467 | return false; | |
468 | } | |
469 | if (ret == 2) { | |
470 | ERROR("Error: %s creation was not completed", c->name); | |
471 | c->destroy(c); | |
472 | return false; | |
473 | } else if (ret == 1) { | |
474 | ERROR("Error: creation of %s is ongoing", c->name); | |
475 | return false; | |
476 | } | |
477 | ||
72d0e1cb SG |
478 | /* is this app meant to be run through lxcinit, as in lxc-execute? */ |
479 | if (useinit && !argv) | |
480 | return false; | |
481 | ||
5cee8c50 | 482 | if (container_mem_lock(c)) |
72d0e1cb SG |
483 | return false; |
484 | conf = c->lxc_conf; | |
485 | daemonize = c->daemonize; | |
5cee8c50 | 486 | container_mem_unlock(c); |
72d0e1cb SG |
487 | |
488 | if (useinit) { | |
13f5be62 | 489 | ret = lxc_execute(c->name, argv, 1, conf, c->config_path); |
72d0e1cb SG |
490 | return ret == 0 ? true : false; |
491 | } | |
492 | ||
493 | if (!argv) | |
494 | argv = default_args; | |
495 | ||
496 | /* | |
497 | * say, I'm not sure - what locks do we want here? Any? | |
498 | * Is liblxc's locking enough here to protect the on disk | |
499 | * container? We don't want to exclude things like lxc_info | |
500 | * while container is running... | |
501 | */ | |
502 | if (daemonize) { | |
503 | if (!lxc_container_get(c)) | |
504 | return false; | |
e51d4895 | 505 | lxc_monitord_spawn(c->config_path); |
71454076 | 506 | |
5cee8c50 | 507 | if (process_lock()) |
71454076 | 508 | return false; |
72d0e1cb SG |
509 | pid_t pid = fork(); |
510 | if (pid < 0) { | |
511 | lxc_container_put(c); | |
5cee8c50 | 512 | process_unlock(); |
72d0e1cb SG |
513 | return false; |
514 | } | |
71454076 DE |
515 | if (pid != 0) { |
516 | ret = wait_on_daemonized_start(c); | |
5cee8c50 | 517 | process_unlock(); |
71454076 DE |
518 | return ret; |
519 | } | |
5cee8c50 | 520 | process_unlock(); |
697fa639 SH |
521 | /* second fork to be reparented by init */ |
522 | pid = fork(); | |
523 | if (pid < 0) { | |
524 | SYSERROR("Error doing dual-fork"); | |
525 | return false; | |
526 | } | |
527 | if (pid != 0) | |
528 | exit(0); | |
72d0e1cb | 529 | /* like daemon(), chdir to / and redirect 0,1,2 to /dev/null */ |
c278cef2 SH |
530 | if (chdir("/")) { |
531 | SYSERROR("Error chdir()ing to /."); | |
532 | return false; | |
533 | } | |
72d0e1cb SG |
534 | close(0); |
535 | close(1); | |
536 | close(2); | |
537 | open("/dev/null", O_RDONLY); | |
538 | open("/dev/null", O_RDWR); | |
539 | open("/dev/null", O_RDWR); | |
540 | setsid(); | |
541 | } | |
542 | ||
72d0e1cb SG |
543 | reboot: |
544 | conf->reboot = 0; | |
13f5be62 | 545 | ret = lxc_start(c->name, argv, conf, c->config_path); |
72d0e1cb SG |
546 | |
547 | if (conf->reboot) { | |
548 | INFO("container requested reboot"); | |
549 | conf->reboot = 0; | |
72d0e1cb SG |
550 | goto reboot; |
551 | } | |
552 | ||
553 | if (daemonize) { | |
554 | lxc_container_put(c); | |
555 | exit (ret == 0 ? true : false); | |
556 | } else { | |
557 | return (ret == 0 ? true : false); | |
558 | } | |
559 | } | |
560 | ||
561 | /* | |
562 | * note there MUST be an ending NULL | |
563 | */ | |
564 | static bool lxcapi_startl(struct lxc_container *c, int useinit, ...) | |
565 | { | |
566 | va_list ap; | |
567 | char **inargs = NULL, **temp; | |
568 | int n_inargs = 0; | |
569 | bool bret = false; | |
570 | ||
571 | /* container exists */ | |
572 | if (!c) | |
573 | return false; | |
574 | ||
575 | /* build array of arguments if any */ | |
576 | va_start(ap, useinit); | |
577 | while (1) { | |
578 | char *arg; | |
579 | arg = va_arg(ap, char *); | |
580 | if (!arg) | |
581 | break; | |
582 | n_inargs++; | |
583 | temp = realloc(inargs, n_inargs * sizeof(*inargs)); | |
586d4e9b SH |
584 | if (!temp) { |
585 | va_end(ap); | |
72d0e1cb | 586 | goto out; |
586d4e9b | 587 | } |
72d0e1cb SG |
588 | inargs = temp; |
589 | inargs[n_inargs - 1] = strdup(arg); // not sure if it's safe not to copy | |
590 | } | |
591 | va_end(ap); | |
592 | ||
593 | /* add trailing NULL */ | |
594 | if (n_inargs) { | |
595 | n_inargs++; | |
596 | temp = realloc(inargs, n_inargs * sizeof(*inargs)); | |
597 | if (!temp) | |
598 | goto out; | |
599 | inargs = temp; | |
600 | inargs[n_inargs - 1] = NULL; | |
601 | } | |
602 | ||
603 | bret = lxcapi_start(c, useinit, inargs); | |
604 | ||
605 | out: | |
606 | if (inargs) { | |
607 | int i; | |
608 | for (i = 0; i < n_inargs; i++) { | |
609 | if (inargs[i]) | |
610 | free(inargs[i]); | |
611 | } | |
612 | free(inargs); | |
613 | } | |
614 | ||
615 | return bret; | |
616 | } | |
617 | ||
618 | static bool lxcapi_stop(struct lxc_container *c) | |
619 | { | |
620 | int ret; | |
621 | ||
622 | if (!c) | |
623 | return false; | |
624 | ||
ef6e34ee | 625 | ret = lxc_cmd_stop(c->name, c->config_path); |
72d0e1cb SG |
626 | |
627 | return ret == 0; | |
72d0e1cb SG |
628 | } |
629 | ||
630 | static bool valid_template(char *t) | |
631 | { | |
632 | struct stat statbuf; | |
633 | int statret; | |
634 | ||
635 | statret = stat(t, &statbuf); | |
636 | if (statret == 0) | |
637 | return true; | |
638 | return false; | |
639 | } | |
640 | ||
641 | /* | |
642 | * create the standard expected container dir | |
643 | */ | |
644 | static bool create_container_dir(struct lxc_container *c) | |
645 | { | |
646 | char *s; | |
647 | int len, ret; | |
648 | ||
2a59a681 | 649 | len = strlen(c->config_path) + strlen(c->name) + 2; |
72d0e1cb SG |
650 | s = malloc(len); |
651 | if (!s) | |
652 | return false; | |
2a59a681 | 653 | ret = snprintf(s, len, "%s/%s", c->config_path, c->name); |
72d0e1cb SG |
654 | if (ret < 0 || ret >= len) { |
655 | free(s); | |
656 | return false; | |
657 | } | |
658 | ret = mkdir(s, 0755); | |
659 | if (ret) { | |
660 | if (errno == EEXIST) | |
661 | ret = 0; | |
662 | else | |
663 | SYSERROR("failed to create container path for %s\n", c->name); | |
664 | } | |
665 | free(s); | |
666 | return ret == 0; | |
667 | } | |
668 | ||
1897e3bc SH |
669 | static const char *lxcapi_get_config_path(struct lxc_container *c); |
670 | static bool lxcapi_set_config_item(struct lxc_container *c, const char *key, const char *v); | |
671 | ||
72d0e1cb | 672 | /* |
1897e3bc SH |
673 | * do_bdev_create: thin wrapper around bdev_create(). Like bdev_create(), |
674 | * it returns a mounted bdev on success, NULL on error. | |
72d0e1cb | 675 | */ |
1897e3bc SH |
676 | static struct bdev *do_bdev_create(struct lxc_container *c, const char *type, |
677 | struct bdev_specs *specs) | |
678 | { | |
679 | char *dest; | |
680 | const char *lxcpath = lxcapi_get_config_path(c); | |
681 | size_t len; | |
682 | struct bdev *bdev; | |
683 | int ret; | |
684 | ||
685 | /* lxcpath/lxcname/rootfs */ | |
686 | len = strlen(c->name) + strlen(lxcpath) + 9; | |
687 | dest = alloca(len); | |
688 | ret = snprintf(dest, len, "%s/%s/rootfs", lxcpath, c->name); | |
689 | if (ret < 0 || ret >= len) | |
690 | return NULL; | |
691 | ||
692 | bdev = bdev_create(dest, type, c->name, specs); | |
693 | if (!bdev) | |
694 | return NULL; | |
695 | lxcapi_set_config_item(c, "lxc.rootfs", bdev->src); | |
696 | return bdev; | |
697 | } | |
698 | ||
699 | static bool lxcapi_destroy(struct lxc_container *c); | |
700 | /* | |
701 | * lxcapi_create: | |
702 | * create a container with the given parameters. | |
703 | * @c: container to be created. It has the lxcpath, name, and a starting | |
704 | * configuration already set | |
705 | * @t: the template to execute to instantiate the root filesystem and | |
706 | * adjust the configuration. | |
707 | * @bdevtype: backing store type to use. If NULL, dir will be used. | |
708 | * @specs: additional parameters for the backing store, i.e. LVM vg to | |
709 | * use. | |
710 | * | |
711 | * @argv: the arguments to pass to the template, terminated by NULL. If no | |
712 | * arguments, you can just pass NULL. | |
713 | */ | |
714 | static bool lxcapi_create(struct lxc_container *c, const char *t, | |
715 | const char *bdevtype, struct bdev_specs *specs, | |
716 | char *const argv[]) | |
72d0e1cb SG |
717 | { |
718 | bool bret = false; | |
719 | pid_t pid; | |
9be53773 | 720 | char *tpath = NULL, **newargv; |
3e625e2d | 721 | int partial_fd, ret, len, nargs = 0; |
72d0e1cb SG |
722 | |
723 | if (!c) | |
724 | return false; | |
725 | ||
726 | len = strlen(LXCTEMPLATEDIR) + strlen(t) + strlen("/lxc-") + 1; | |
727 | tpath = malloc(len); | |
728 | if (!tpath) | |
729 | return false; | |
730 | ret = snprintf(tpath, len, "%s/lxc-%s", LXCTEMPLATEDIR, t); | |
731 | if (ret < 0 || ret >= len) | |
732 | goto out; | |
733 | if (!valid_template(tpath)) { | |
734 | ERROR("bad template: %s\n", t); | |
735 | goto out; | |
736 | } | |
737 | ||
72d0e1cb SG |
738 | if (!c->save_config(c, NULL)) { |
739 | ERROR("failed to save starting configuration for %s\n", c->name); | |
740 | goto out; | |
741 | } | |
742 | ||
5a3d2e1e | 743 | /* container is already created if we have a config and rootfs.path is accessible */ |
e51d4895 | 744 | if (lxcapi_is_defined(c) && c->lxc_conf && c->lxc_conf->rootfs.path && access(c->lxc_conf->rootfs.path, F_OK) == 0) |
a741a85d | 745 | goto out; |
5a3d2e1e | 746 | |
3e625e2d SH |
747 | /* Mark that this container is being created */ |
748 | if ((partial_fd = create_partial(c)) < 0) | |
749 | goto out; | |
750 | ||
1897e3bc | 751 | /* no need to get disk lock bc we have the partial locked */ |
72d0e1cb | 752 | |
1897e3bc SH |
753 | /* |
754 | * Create the backing store | |
755 | * Note we can't do this in the same task as we use to execute the | |
756 | * template because of the way zfs works. | |
757 | * After you 'zfs create', zfs mounts the fs only in the initial | |
758 | * namespace. | |
759 | */ | |
760 | pid = fork(); | |
761 | if (pid < 0) { | |
762 | SYSERROR("failed to fork task for container creation template\n"); | |
763 | goto out_unlock; | |
764 | } | |
765 | ||
766 | if (pid == 0) { // child | |
767 | struct bdev *bdev = NULL; | |
768 | ||
769 | if (!(bdev = do_bdev_create(c, bdevtype, specs))) { | |
770 | ERROR("Error creating backing store type %s for %s", | |
771 | bdevtype ? bdevtype : "(none)", c->name); | |
772 | exit(1); | |
773 | } | |
774 | ||
775 | /* save config file again to store the new rootfs location */ | |
776 | if (!c->save_config(c, NULL)) { | |
777 | ERROR("failed to save starting configuration for %s\n", c->name); | |
778 | // parent task won't see bdev in config so we delete it | |
779 | bdev->ops->umount(bdev); | |
780 | bdev->ops->destroy(bdev); | |
781 | exit(1); | |
782 | } | |
783 | exit(0); | |
784 | } | |
785 | if (wait_for_pid(pid) != 0) | |
786 | goto out; | |
787 | ||
788 | /* reload config to get the rootfs */ | |
789 | if (c->lxc_conf) | |
790 | lxc_conf_free(c->lxc_conf); | |
791 | c->lxc_conf = NULL; | |
792 | if (!load_config_locked(c, c->configfile)) | |
df271a59 | 793 | goto out; |
72d0e1cb | 794 | |
1897e3bc SH |
795 | /* |
796 | * now execute the template | |
797 | */ | |
72d0e1cb SG |
798 | pid = fork(); |
799 | if (pid < 0) { | |
800 | SYSERROR("failed to fork task for container creation template\n"); | |
801 | goto out_unlock; | |
802 | } | |
803 | ||
804 | if (pid == 0) { // child | |
1897e3bc SH |
805 | char *patharg, *namearg, *rootfsarg, *src; |
806 | struct bdev *bdev = NULL; | |
72d0e1cb SG |
807 | int i; |
808 | ||
1897e3bc SH |
809 | if (unshare(CLONE_NEWNS) < 0) { |
810 | ERROR("error unsharing mounts"); | |
811 | exit(1); | |
812 | } | |
813 | ||
814 | src = c->lxc_conf->rootfs.path; | |
815 | /* | |
816 | * for an overlayfs create, what the user wants is the template to fill | |
817 | * in what will become the readonly lower layer. So don't mount for | |
818 | * the template | |
819 | */ | |
820 | if (strncmp(src, "overlayfs:", 10) == 0) { | |
821 | src = overlayfs_getlower(src+10); | |
822 | } | |
823 | bdev = bdev_init(src, c->lxc_conf->rootfs.mount, NULL); | |
824 | if (!bdev) { | |
825 | ERROR("Error opening rootfs"); | |
826 | exit(1); | |
827 | } | |
828 | ||
829 | if (bdev->ops->mount(bdev) < 0) { | |
830 | ERROR("Error mounting rootfs"); | |
831 | exit(1); | |
832 | } | |
833 | ||
72d0e1cb SG |
834 | /* |
835 | * create our new array, pre-pend the template name and | |
836 | * base args | |
837 | */ | |
838 | if (argv) | |
1897e3bc SH |
839 | for (nargs = 0; argv[nargs]; nargs++) ; |
840 | nargs += 4; // template, path, rootfs and name args | |
72d0e1cb SG |
841 | newargv = malloc(nargs * sizeof(*newargv)); |
842 | if (!newargv) | |
843 | exit(1); | |
2acf7795 | 844 | newargv[0] = (char *)t; |
72d0e1cb | 845 | |
2a59a681 | 846 | len = strlen(c->config_path) + strlen(c->name) + strlen("--path=") + 2; |
72d0e1cb SG |
847 | patharg = malloc(len); |
848 | if (!patharg) | |
849 | exit(1); | |
2a59a681 | 850 | ret = snprintf(patharg, len, "--path=%s/%s", c->config_path, c->name); |
72d0e1cb SG |
851 | if (ret < 0 || ret >= len) |
852 | exit(1); | |
853 | newargv[1] = patharg; | |
854 | len = strlen("--name=") + strlen(c->name) + 1; | |
855 | namearg = malloc(len); | |
856 | if (!namearg) | |
857 | exit(1); | |
858 | ret = snprintf(namearg, len, "--name=%s", c->name); | |
859 | if (ret < 0 || ret >= len) | |
860 | exit(1); | |
861 | newargv[2] = namearg; | |
862 | ||
1897e3bc SH |
863 | len = strlen("--rootfs=") + 1 + strlen(bdev->dest); |
864 | rootfsarg = malloc(len); | |
865 | if (!rootfsarg) | |
866 | exit(1); | |
867 | ret = snprintf(rootfsarg, len, "--rootfs=%s", bdev->dest); | |
868 | if (ret < 0 || ret >= len) | |
869 | exit(1); | |
870 | newargv[3] = rootfsarg; | |
871 | ||
72d0e1cb SG |
872 | /* add passed-in args */ |
873 | if (argv) | |
1897e3bc SH |
874 | for (i = 4; i < nargs; i++) |
875 | newargv[i] = argv[i-4]; | |
72d0e1cb SG |
876 | |
877 | /* add trailing NULL */ | |
878 | nargs++; | |
879 | newargv = realloc(newargv, nargs * sizeof(*newargv)); | |
880 | if (!newargv) | |
881 | exit(1); | |
882 | newargv[nargs - 1] = NULL; | |
883 | ||
884 | /* execute */ | |
e6a19d26 | 885 | execv(tpath, newargv); |
72d0e1cb SG |
886 | SYSERROR("failed to execute template %s", tpath); |
887 | exit(1); | |
888 | } | |
889 | ||
9be53773 SH |
890 | if (wait_for_pid(pid) != 0) { |
891 | ERROR("container creation template for %s failed\n", c->name); | |
8eb5694b SH |
892 | goto out_unlock; |
893 | } | |
894 | ||
895 | // now clear out the lxc_conf we have, reload from the created | |
896 | // container | |
897 | if (c->lxc_conf) | |
898 | lxc_conf_free(c->lxc_conf); | |
899 | c->lxc_conf = NULL; | |
900 | bret = load_config_locked(c, c->configfile); | |
72d0e1cb SG |
901 | |
902 | out_unlock: | |
3e625e2d SH |
903 | if (partial_fd >= 0) |
904 | remove_partial(c, partial_fd); | |
72d0e1cb SG |
905 | out: |
906 | if (tpath) | |
907 | free(tpath); | |
1897e3bc SH |
908 | if (!bret && c) |
909 | lxcapi_destroy(c); | |
72d0e1cb SG |
910 | return bret; |
911 | } | |
912 | ||
3e625e2d SH |
913 | static bool lxcapi_reboot(struct lxc_container *c) |
914 | { | |
915 | pid_t pid; | |
916 | ||
917 | if (!c) | |
918 | return false; | |
919 | if (!c->is_running(c)) | |
920 | return false; | |
921 | pid = c->init_pid(c); | |
922 | if (pid <= 0) | |
923 | return false; | |
924 | if (kill(pid, SIGINT) < 0) | |
925 | return false; | |
926 | return true; | |
927 | ||
928 | } | |
929 | ||
72d0e1cb SG |
930 | static bool lxcapi_shutdown(struct lxc_container *c, int timeout) |
931 | { | |
932 | bool retv; | |
933 | pid_t pid; | |
934 | ||
935 | if (!c) | |
936 | return false; | |
937 | ||
938 | if (!timeout) | |
939 | timeout = -1; | |
940 | if (!c->is_running(c)) | |
941 | return true; | |
942 | pid = c->init_pid(c); | |
943 | if (pid <= 0) | |
944 | return true; | |
945 | kill(pid, SIGPWR); | |
946 | retv = c->wait(c, "STOPPED", timeout); | |
f6144ed4 | 947 | if (!retv && timeout > 0) { |
72d0e1cb SG |
948 | c->stop(c); |
949 | retv = c->wait(c, "STOPPED", 0); // 0 means don't wait | |
950 | } | |
951 | return retv; | |
952 | } | |
953 | ||
1897e3bc SH |
954 | static bool lxcapi_createl(struct lxc_container *c, const char *t, |
955 | const char *bdevtype, struct bdev_specs *specs, ...) | |
72d0e1cb SG |
956 | { |
957 | bool bret = false; | |
958 | char **args = NULL, **temp; | |
959 | va_list ap; | |
960 | int nargs = 0; | |
961 | ||
962 | if (!c) | |
963 | return false; | |
964 | ||
965 | /* | |
966 | * since we're going to wait for create to finish, I don't think we | |
967 | * need to get a copy of the arguments. | |
968 | */ | |
1897e3bc | 969 | va_start(ap, specs); |
72d0e1cb SG |
970 | while (1) { |
971 | char *arg; | |
972 | arg = va_arg(ap, char *); | |
973 | if (!arg) | |
974 | break; | |
975 | nargs++; | |
83cab6e0 | 976 | temp = realloc(args, (nargs+1) * sizeof(*args)); |
41670788 SH |
977 | if (!temp) { |
978 | va_end(ap); | |
72d0e1cb | 979 | goto out; |
41670788 | 980 | } |
72d0e1cb SG |
981 | args = temp; |
982 | args[nargs - 1] = arg; | |
983 | } | |
984 | va_end(ap); | |
63e414f8 SH |
985 | if (args) |
986 | args[nargs] = NULL; | |
72d0e1cb | 987 | |
1897e3bc | 988 | bret = c->create(c, t, bdevtype, specs, args); |
72d0e1cb SG |
989 | |
990 | out: | |
991 | if (args) | |
992 | free(args); | |
993 | return bret; | |
994 | } | |
995 | ||
12a50cc6 | 996 | static bool lxcapi_clear_config_item(struct lxc_container *c, const char *key) |
72d0e1cb SG |
997 | { |
998 | int ret; | |
999 | ||
1000 | if (!c || !c->lxc_conf) | |
1001 | return false; | |
5cee8c50 | 1002 | if (container_mem_lock(c)) |
72d0e1cb | 1003 | return false; |
72d0e1cb | 1004 | ret = lxc_clear_config_item(c->lxc_conf, key); |
5cee8c50 | 1005 | container_mem_unlock(c); |
72d0e1cb SG |
1006 | return ret == 0; |
1007 | } | |
1008 | ||
9c83a661 SG |
1009 | char** lxcapi_get_ips(struct lxc_container *c, char* interface, char* family, int scope) |
1010 | { | |
1011 | int count = 0; | |
1012 | struct ifaddrs *interfaceArray = NULL, *tempIfAddr = NULL; | |
1013 | char addressOutputBuffer[INET6_ADDRSTRLEN]; | |
1014 | void *tempAddrPtr = NULL; | |
1015 | char **addresses = NULL, **temp; | |
1016 | char *address = NULL; | |
1017 | char new_netns_path[MAXPATHLEN]; | |
1018 | int old_netns = -1, new_netns = -1, ret = 0; | |
1019 | ||
1020 | if (!c->is_running(c)) | |
1021 | goto out; | |
1022 | ||
1023 | /* Save reference to old netns */ | |
1024 | old_netns = open("/proc/self/ns/net", O_RDONLY); | |
1025 | if (old_netns < 0) { | |
1026 | SYSERROR("failed to open /proc/self/ns/net"); | |
1027 | goto out; | |
1028 | } | |
1029 | ||
1030 | /* Switch to new netns */ | |
1031 | ret = snprintf(new_netns_path, MAXPATHLEN, "/proc/%d/ns/net", c->init_pid(c)); | |
1032 | if (ret < 0 || ret >= MAXPATHLEN) | |
1033 | goto out; | |
1034 | ||
1035 | new_netns = open(new_netns_path, O_RDONLY); | |
1036 | if (new_netns < 0) { | |
1037 | SYSERROR("failed to open %s", new_netns_path); | |
1038 | goto out; | |
1039 | } | |
1040 | ||
1041 | if (setns(new_netns, CLONE_NEWNET)) { | |
1042 | SYSERROR("failed to setns"); | |
1043 | goto out; | |
1044 | } | |
1045 | ||
1046 | /* Grab the list of interfaces */ | |
1047 | if (getifaddrs(&interfaceArray)) { | |
1048 | SYSERROR("failed to get interfaces list"); | |
1049 | goto out; | |
1050 | } | |
1051 | ||
1052 | /* Iterate through the interfaces */ | |
1053 | for (tempIfAddr = interfaceArray; tempIfAddr != NULL; tempIfAddr = tempIfAddr->ifa_next) { | |
1054 | if(tempIfAddr->ifa_addr->sa_family == AF_INET) { | |
1055 | if (family && strcmp(family, "inet")) | |
1056 | continue; | |
1057 | tempAddrPtr = &((struct sockaddr_in *)tempIfAddr->ifa_addr)->sin_addr; | |
1058 | } | |
1059 | else { | |
1060 | if (family && strcmp(family, "inet6")) | |
1061 | continue; | |
1062 | ||
1063 | if (((struct sockaddr_in6 *)tempIfAddr->ifa_addr)->sin6_scope_id != scope) | |
1064 | continue; | |
1065 | ||
1066 | tempAddrPtr = &((struct sockaddr_in6 *)tempIfAddr->ifa_addr)->sin6_addr; | |
1067 | } | |
1068 | ||
1069 | if (interface && strcmp(interface, tempIfAddr->ifa_name)) | |
1070 | continue; | |
1071 | else if (!interface && strcmp("lo", tempIfAddr->ifa_name) == 0) | |
1072 | continue; | |
1073 | ||
1074 | address = (char *)inet_ntop(tempIfAddr->ifa_addr->sa_family, | |
1075 | tempAddrPtr, | |
1076 | addressOutputBuffer, | |
1077 | sizeof(addressOutputBuffer)); | |
1078 | if (!address) | |
1079 | continue; | |
1080 | ||
1081 | count += 1; | |
1082 | temp = realloc(addresses, count * sizeof(*addresses)); | |
1083 | if (!temp) { | |
1084 | count--; | |
1085 | goto out; | |
1086 | } | |
1087 | addresses = temp; | |
1088 | addresses[count - 1] = strdup(address); | |
1089 | } | |
1090 | ||
1091 | out: | |
1092 | if(interfaceArray) | |
1093 | freeifaddrs(interfaceArray); | |
1094 | ||
1095 | /* Switch back to original netns */ | |
1096 | if (old_netns >= 0 && setns(old_netns, CLONE_NEWNET)) | |
1097 | SYSERROR("failed to setns"); | |
1098 | if (new_netns >= 0) | |
1099 | close(new_netns); | |
1100 | if (old_netns >= 0) | |
1101 | close(old_netns); | |
1102 | ||
1103 | /* Append NULL to the array */ | |
1104 | if (count) { | |
1105 | count++; | |
1106 | temp = realloc(addresses, count * sizeof(*addresses)); | |
1107 | if (!temp) { | |
fca3080f DE |
1108 | int i; |
1109 | for (i = 0; i < count-1; i++) | |
9c83a661 SG |
1110 | free(addresses[i]); |
1111 | free(addresses); | |
1112 | return NULL; | |
1113 | } | |
1114 | addresses = temp; | |
1115 | addresses[count - 1] = NULL; | |
1116 | } | |
1117 | ||
1118 | return addresses; | |
1119 | } | |
1120 | ||
12a50cc6 | 1121 | static int lxcapi_get_config_item(struct lxc_container *c, const char *key, char *retv, int inlen) |
72d0e1cb SG |
1122 | { |
1123 | int ret; | |
1124 | ||
1125 | if (!c || !c->lxc_conf) | |
1126 | return -1; | |
5cee8c50 | 1127 | if (container_mem_lock(c)) |
72d0e1cb | 1128 | return -1; |
72d0e1cb | 1129 | ret = lxc_get_config_item(c->lxc_conf, key, retv, inlen); |
5cee8c50 | 1130 | container_mem_unlock(c); |
72d0e1cb SG |
1131 | return ret; |
1132 | } | |
1133 | ||
12a50cc6 | 1134 | static int lxcapi_get_keys(struct lxc_container *c, const char *key, char *retv, int inlen) |
72d0e1cb SG |
1135 | { |
1136 | if (!key) | |
1137 | return lxc_listconfigs(retv, inlen); | |
1138 | /* | |
1139 | * Support 'lxc.network.<idx>', i.e. 'lxc.network.0' | |
1140 | * This is an intelligent result to show which keys are valid given | |
1141 | * the type of nic it is | |
1142 | */ | |
1143 | if (!c || !c->lxc_conf) | |
1144 | return -1; | |
5cee8c50 | 1145 | if (container_mem_lock(c)) |
72d0e1cb SG |
1146 | return -1; |
1147 | int ret = -1; | |
1148 | if (strncmp(key, "lxc.network.", 12) == 0) | |
1149 | ret = lxc_list_nicconfigs(c->lxc_conf, key, retv, inlen); | |
5cee8c50 | 1150 | container_mem_unlock(c); |
72d0e1cb SG |
1151 | return ret; |
1152 | } | |
1153 | ||
12a50cc6 | 1154 | static bool lxcapi_save_config(struct lxc_container *c, const char *alt_file) |
72d0e1cb | 1155 | { |
39dc698c SH |
1156 | FILE *fout; |
1157 | bool ret = false, need_disklock = false; | |
1158 | int lret; | |
1159 | ||
72d0e1cb SG |
1160 | if (!alt_file) |
1161 | alt_file = c->configfile; | |
1162 | if (!alt_file) | |
1163 | return false; // should we write to stdout if no file is specified? | |
39dc698c SH |
1164 | |
1165 | // If we haven't yet loaded a config, load the stock config | |
1166 | if (!c->lxc_conf) { | |
72d0e1cb SG |
1167 | if (!c->load_config(c, LXC_DEFAULT_CONFIG)) { |
1168 | ERROR("Error loading default configuration file %s while saving %s\n", LXC_DEFAULT_CONFIG, c->name); | |
1169 | return false; | |
1170 | } | |
39dc698c | 1171 | } |
72d0e1cb | 1172 | |
5a3d2e1e SG |
1173 | if (!create_container_dir(c)) |
1174 | return false; | |
1175 | ||
39dc698c SH |
1176 | /* |
1177 | * If we're writing to the container's config file, take the | |
1178 | * disk lock. Otherwise just take the memlock to protect the | |
1179 | * struct lxc_container while we're traversing it. | |
1180 | */ | |
1181 | if (strcmp(c->configfile, alt_file) == 0) | |
1182 | need_disklock = true; | |
1183 | ||
1184 | if (need_disklock) | |
1185 | lret = container_disk_lock(c); | |
1186 | else | |
1187 | lret = container_mem_lock(c); | |
1188 | ||
1189 | if (lret) | |
72d0e1cb | 1190 | return false; |
39dc698c SH |
1191 | |
1192 | fout = fopen(alt_file, "w"); | |
1193 | if (!fout) | |
1194 | goto out; | |
72d0e1cb SG |
1195 | write_config(fout, c->lxc_conf); |
1196 | fclose(fout); | |
39dc698c SH |
1197 | ret = true; |
1198 | ||
1199 | out: | |
1200 | if (need_disklock) | |
1201 | container_disk_unlock(c); | |
1202 | else | |
1203 | container_mem_unlock(c); | |
1204 | return ret; | |
72d0e1cb SG |
1205 | } |
1206 | ||
60bf62d4 | 1207 | // do we want the api to support --force, or leave that to the caller? |
72d0e1cb SG |
1208 | static bool lxcapi_destroy(struct lxc_container *c) |
1209 | { | |
1897e3bc | 1210 | struct bdev *r = NULL; |
60bf62d4 | 1211 | bool ret = false; |
72d0e1cb | 1212 | |
1897e3bc | 1213 | if (!c || !lxcapi_is_defined(c)) |
5a3d2e1e SG |
1214 | return false; |
1215 | ||
3bc449ed | 1216 | if (container_disk_lock(c)) |
72d0e1cb | 1217 | return false; |
72d0e1cb | 1218 | |
39dc698c | 1219 | if (!is_stopped(c)) { |
60bf62d4 SH |
1220 | // we should queue some sort of error - in c->error_string? |
1221 | ERROR("container %s is not stopped", c->name); | |
1222 | goto out; | |
72d0e1cb SG |
1223 | } |
1224 | ||
3bc449ed | 1225 | if (c->lxc_conf && c->lxc_conf->rootfs.path && c->lxc_conf->rootfs.mount) |
1897e3bc | 1226 | r = bdev_init(c->lxc_conf->rootfs.path, c->lxc_conf->rootfs.mount, NULL); |
60bf62d4 SH |
1227 | if (r) { |
1228 | if (r->ops->destroy(r) < 0) { | |
1229 | ERROR("Error destroying rootfs for %s", c->name); | |
1230 | goto out; | |
1231 | } | |
1232 | } | |
1233 | ||
1234 | const char *p1 = lxcapi_get_config_path(c); | |
1235 | char *path = alloca(strlen(p1) + strlen(c->name) + 2); | |
1236 | sprintf(path, "%s/%s", p1, c->name); | |
1237 | if (lxc_rmdir_onedev(path) < 0) { | |
1238 | ERROR("Error destroying container directory for %s", c->name); | |
1239 | goto out; | |
1240 | } | |
1241 | ret = true; | |
1242 | ||
1243 | out: | |
3bc449ed | 1244 | container_disk_unlock(c); |
60bf62d4 | 1245 | return ret; |
72d0e1cb SG |
1246 | } |
1247 | ||
12a50cc6 | 1248 | static bool lxcapi_set_config_item(struct lxc_container *c, const char *key, const char *v) |
72d0e1cb SG |
1249 | { |
1250 | int ret; | |
1251 | bool b = false; | |
1252 | struct lxc_config_t *config; | |
1253 | ||
1254 | if (!c) | |
1255 | return false; | |
1256 | ||
5cee8c50 | 1257 | if (container_mem_lock(c)) |
72d0e1cb SG |
1258 | return false; |
1259 | ||
1260 | if (!c->lxc_conf) | |
1261 | c->lxc_conf = lxc_conf_init(); | |
1262 | if (!c->lxc_conf) | |
1263 | goto err; | |
1264 | config = lxc_getconfig(key); | |
1265 | if (!config) | |
1266 | goto err; | |
1267 | ret = config->cb(key, v, c->lxc_conf); | |
1268 | if (!ret) | |
1269 | b = true; | |
1270 | ||
1271 | err: | |
5cee8c50 | 1272 | container_mem_unlock(c); |
72d0e1cb SG |
1273 | return b; |
1274 | } | |
1275 | ||
1276 | static char *lxcapi_config_file_name(struct lxc_container *c) | |
1277 | { | |
1278 | if (!c || !c->configfile) | |
1279 | return NULL; | |
1280 | return strdup(c->configfile); | |
1281 | } | |
1282 | ||
2a59a681 SH |
1283 | static const char *lxcapi_get_config_path(struct lxc_container *c) |
1284 | { | |
1285 | if (!c || !c->config_path) | |
1286 | return NULL; | |
1287 | return (const char *)(c->config_path); | |
1288 | } | |
1289 | ||
afeecbba SH |
1290 | /* |
1291 | * not for export | |
1292 | * Just recalculate the c->configfile based on the | |
1293 | * c->config_path, which must be set. | |
1294 | * The lxc_container must be locked or not yet public. | |
1295 | */ | |
1296 | static bool set_config_filename(struct lxc_container *c) | |
1297 | { | |
1298 | char *newpath; | |
1299 | int len, ret; | |
1300 | ||
1301 | if (!c->config_path) | |
1302 | return false; | |
1303 | ||
1304 | /* $lxc_path + "/" + c->name + "/" + "config" + '\0' */ | |
1305 | len = strlen(c->config_path) + strlen(c->name) + strlen("config") + 3; | |
1306 | newpath = malloc(len); | |
1307 | if (!newpath) | |
1308 | return false; | |
1309 | ||
1310 | ret = snprintf(newpath, len, "%s/%s/config", c->config_path, c->name); | |
1311 | if (ret < 0 || ret >= len) { | |
1312 | fprintf(stderr, "Error printing out config file name\n"); | |
1313 | free(newpath); | |
1314 | return false; | |
1315 | } | |
1316 | ||
1317 | if (c->configfile) | |
1318 | free(c->configfile); | |
1319 | c->configfile = newpath; | |
1320 | ||
1321 | return true; | |
1322 | } | |
1323 | ||
2a59a681 SH |
1324 | static bool lxcapi_set_config_path(struct lxc_container *c, const char *path) |
1325 | { | |
1326 | char *p; | |
1327 | bool b = false; | |
afeecbba | 1328 | char *oldpath = NULL; |
2a59a681 SH |
1329 | |
1330 | if (!c) | |
1331 | return b; | |
1332 | ||
5cee8c50 | 1333 | if (container_mem_lock(c)) |
2a59a681 SH |
1334 | return b; |
1335 | ||
1336 | p = strdup(path); | |
afeecbba SH |
1337 | if (!p) { |
1338 | ERROR("Out of memory setting new lxc path"); | |
2a59a681 | 1339 | goto err; |
afeecbba SH |
1340 | } |
1341 | ||
2a59a681 SH |
1342 | b = true; |
1343 | if (c->config_path) | |
afeecbba | 1344 | oldpath = c->config_path; |
2a59a681 | 1345 | c->config_path = p; |
afeecbba SH |
1346 | |
1347 | /* Since we've changed the config path, we have to change the | |
1348 | * config file name too */ | |
1349 | if (!set_config_filename(c)) { | |
1350 | ERROR("Out of memory setting new config filename"); | |
1351 | b = false; | |
1352 | free(c->config_path); | |
1353 | c->config_path = oldpath; | |
1354 | oldpath = NULL; | |
1355 | } | |
2a59a681 | 1356 | err: |
afeecbba SH |
1357 | if (oldpath) |
1358 | free(oldpath); | |
5cee8c50 | 1359 | container_mem_unlock(c); |
2a59a681 SH |
1360 | return b; |
1361 | } | |
1362 | ||
1363 | ||
794dd120 SH |
1364 | static bool lxcapi_set_cgroup_item(struct lxc_container *c, const char *subsys, const char *value) |
1365 | { | |
1366 | int ret; | |
794dd120 SH |
1367 | |
1368 | if (!c) | |
1369 | return false; | |
1370 | ||
3bc449ed | 1371 | if (is_stopped(c)) |
794dd120 SH |
1372 | return false; |
1373 | ||
3bc449ed SH |
1374 | if (container_disk_lock(c)) |
1375 | return false; | |
794dd120 | 1376 | |
3bc449ed SH |
1377 | ret = lxc_cgroup_set(c->name, subsys, value, c->config_path) == 0; |
1378 | ||
1379 | container_disk_unlock(c); | |
1380 | return ret == 0; | |
794dd120 SH |
1381 | } |
1382 | ||
1383 | static int lxcapi_get_cgroup_item(struct lxc_container *c, const char *subsys, char *retv, int inlen) | |
1384 | { | |
3bc449ed | 1385 | int ret; |
794dd120 SH |
1386 | |
1387 | if (!c || !c->lxc_conf) | |
1388 | return -1; | |
1389 | ||
3bc449ed | 1390 | if (is_stopped(c)) |
794dd120 SH |
1391 | return -1; |
1392 | ||
3bc449ed SH |
1393 | if (container_disk_lock(c)) |
1394 | return -1; | |
794dd120 | 1395 | |
ae5c8b8e | 1396 | ret = lxc_cgroup_get(c->name, subsys, retv, inlen, c->config_path); |
794dd120 | 1397 | |
3bc449ed | 1398 | container_disk_unlock(c); |
794dd120 SH |
1399 | return ret; |
1400 | } | |
1401 | ||
67e571de | 1402 | const char *lxc_get_default_config_path(void) |
83c98d82 DE |
1403 | { |
1404 | return default_lxc_path(); | |
1405 | } | |
794dd120 | 1406 | |
a8428dfa SH |
1407 | const char *lxc_get_default_lvm_vg(void) |
1408 | { | |
1409 | return default_lvm_vg(); | |
1410 | } | |
1411 | ||
1412 | const char *lxc_get_default_zfs_root(void) | |
1413 | { | |
1414 | return default_zfs_root(); | |
1415 | } | |
1416 | ||
b6b918a1 SG |
1417 | const char *lxc_get_version(void) |
1418 | { | |
1419 | return lxc_version(); | |
1420 | } | |
1421 | ||
9be53773 SH |
1422 | static int copy_file(char *old, char *new) |
1423 | { | |
1424 | int in, out; | |
1425 | ssize_t len, ret; | |
1426 | char buf[8096]; | |
1427 | struct stat sbuf; | |
1428 | ||
1429 | if (file_exists(new)) { | |
1430 | ERROR("copy destination %s exists", new); | |
1431 | return -1; | |
1432 | } | |
1433 | ret = stat(old, &sbuf); | |
1434 | if (ret < 0) { | |
1435 | SYSERROR("stat'ing %s", old); | |
1436 | return -1; | |
1437 | } | |
1438 | ||
1439 | in = open(old, O_RDONLY); | |
1440 | if (in < 0) { | |
1441 | SYSERROR("opening original file %s", old); | |
1442 | return -1; | |
1443 | } | |
1444 | out = open(new, O_CREAT | O_EXCL | O_WRONLY, 0644); | |
1445 | if (out < 0) { | |
1446 | SYSERROR("opening new file %s", new); | |
1447 | close(in); | |
1448 | return -1; | |
1449 | } | |
1450 | ||
1451 | while (1) { | |
1452 | len = read(in, buf, 8096); | |
1453 | if (len < 0) { | |
1454 | SYSERROR("reading old file %s", old); | |
1455 | goto err; | |
1456 | } | |
1457 | if (len == 0) | |
1458 | break; | |
1459 | ret = write(out, buf, len); | |
1460 | if (ret < len) { // should we retry? | |
1461 | SYSERROR("write to new file %s was interrupted", new); | |
1462 | goto err; | |
1463 | } | |
1464 | } | |
1465 | close(in); | |
1466 | close(out); | |
1467 | ||
1468 | // we set mode, but not owner/group | |
1469 | ret = chmod(new, sbuf.st_mode); | |
1470 | if (ret) { | |
1471 | SYSERROR("setting mode on %s", new); | |
1472 | return -1; | |
1473 | } | |
1474 | ||
1475 | return 0; | |
1476 | ||
1477 | err: | |
1478 | close(in); | |
1479 | close(out); | |
1480 | return -1; | |
1481 | } | |
1482 | ||
1483 | /* | |
1484 | * we're being passed result of two strstrs(x, y). We want to write | |
1485 | * all data up to the first found string, or to end of the string if | |
1486 | * neither string was found. | |
1487 | * This function will return the earliest found string if any, or else | |
1488 | * NULL | |
1489 | */ | |
1490 | static const char *lowest_nonnull(const char *p1, const char *p2) | |
1491 | { | |
1492 | if (!p1) | |
1493 | return p2; | |
1494 | if (!p2) | |
1495 | return p1; | |
1496 | return p1 < p2 ? p1 : p2; | |
1497 | } | |
1498 | ||
1499 | static int is_word_sep(char c) | |
1500 | { | |
1501 | switch(c) { | |
1502 | case '\0': | |
1503 | case '\n': | |
1504 | case '\r': | |
1505 | case '\t': | |
1506 | case ' ': | |
1507 | case '=': | |
1508 | case '/': | |
1509 | return 1; | |
1510 | default: return 0; | |
1511 | } | |
1512 | } | |
1513 | ||
1514 | static const char *find_first_wholeword(const char *p, const char *word) | |
1515 | { | |
1516 | if (!p) | |
1517 | return NULL; | |
1518 | ||
1519 | while ((p = strstr(p, word)) != NULL) { | |
1520 | if (is_word_sep(*(p-1)) && is_word_sep(p[strlen(word)])) | |
1521 | return p; | |
1522 | p++; | |
1523 | } | |
1524 | return NULL; | |
1525 | } | |
1526 | ||
1527 | static int update_name_and_paths(const char *path, struct lxc_container *oldc, | |
1528 | const char *newname, const char *newpath) | |
1529 | { | |
1530 | FILE *f; | |
a7478944 | 1531 | long flen; |
9be53773 SH |
1532 | char *contents; |
1533 | const char *p0, *p1, *p2, *end; | |
1534 | const char *oldpath = oldc->get_config_path(oldc); | |
1535 | const char *oldname = oldc->name; | |
1536 | ||
1537 | f = fopen(path, "r"); | |
1538 | if (!f) { | |
1539 | SYSERROR("opening old config"); | |
1540 | return -1; | |
1541 | } | |
1542 | if (fseek(f, 0, SEEK_END) < 0) { | |
1543 | SYSERROR("seeking to end of old config"); | |
1544 | fclose(f); | |
1545 | return -1; | |
1546 | } | |
1547 | flen = ftell(f); | |
1548 | if (flen < 0) { | |
1549 | fclose(f); | |
1550 | SYSERROR("telling size of old config"); | |
1551 | return -1; | |
1552 | } | |
1553 | if (fseek(f, 0, SEEK_SET) < 0) { | |
1554 | fclose(f); | |
1555 | SYSERROR("rewinding old config"); | |
1556 | return -1; | |
1557 | } | |
a2eea3c1 | 1558 | contents = malloc(flen+1); |
9be53773 SH |
1559 | if (!contents) { |
1560 | SYSERROR("out of memory"); | |
1561 | fclose(f); | |
a2eea3c1 | 1562 | return -1; |
9be53773 SH |
1563 | } |
1564 | if (fread(contents, 1, flen, f) != flen) { | |
1565 | free(contents); | |
1566 | fclose(f); | |
1567 | SYSERROR("reading old config"); | |
1568 | return -1; | |
1569 | } | |
a2eea3c1 | 1570 | contents[flen] = '\0'; |
9be53773 SH |
1571 | if (fclose(f) < 0) { |
1572 | free(contents); | |
1573 | SYSERROR("closing old config"); | |
1574 | return -1; | |
1575 | } | |
1576 | ||
1577 | f = fopen(path, "w"); | |
1578 | if (!f) { | |
1579 | SYSERROR("reopening config"); | |
1580 | free(contents); | |
1581 | return -1; | |
1582 | } | |
1583 | ||
1584 | p0 = contents; | |
1585 | end = contents + flen; | |
1586 | while (1) { | |
1587 | p1 = find_first_wholeword(p0, oldpath); | |
1588 | p2 = find_first_wholeword(p0, oldname); | |
1589 | if (!p1 && !p2) { | |
1590 | // write the rest and be done | |
1591 | if (fwrite(p0, 1, (end-p0), f) != (end-p0)) { | |
1592 | SYSERROR("writing new config"); | |
1593 | free(contents); | |
1594 | fclose(f); | |
1595 | return -1; | |
1596 | } | |
1597 | free(contents); | |
1598 | fclose(f); | |
1599 | // success | |
1600 | return 0; | |
1601 | } else { | |
1602 | const char *p = lowest_nonnull(p1, p2); | |
1603 | const char *new = (p == p2) ? newname : newpath; | |
1604 | if (fwrite(p0, 1, (p-p0), f) != (p-p0)) { | |
1605 | SYSERROR("writing new config"); | |
1606 | free(contents); | |
1607 | fclose(f); | |
1608 | return -1; | |
1609 | } | |
1610 | p0 = p; | |
1611 | // now write the newpath or newname | |
1612 | if (fwrite(new, 1, strlen(new), f) != strlen(new)) { | |
1613 | SYSERROR("writing new name or path in new config"); | |
1614 | free(contents); | |
1615 | fclose(f); | |
1616 | return -1; | |
1617 | } | |
1618 | p0 += (p == p2) ? strlen(oldname) : strlen(oldpath); | |
1619 | } | |
1620 | } | |
1621 | } | |
1622 | ||
1623 | static int copyhooks(struct lxc_container *oldc, struct lxc_container *c) | |
1624 | { | |
1625 | int i; | |
1626 | int ret; | |
1627 | struct lxc_list *it; | |
1628 | ||
1629 | for (i=0; i<NUM_LXC_HOOKS; i++) { | |
1630 | lxc_list_for_each(it, &c->lxc_conf->hooks[i]) { | |
1631 | char *hookname = it->elem; | |
1632 | char *fname = rindex(hookname, '/'); | |
1633 | char tmppath[MAXPATHLEN]; | |
1634 | if (!fname) // relative path - we don't support, but maybe we should | |
1635 | return 0; | |
1636 | // copy the script, and change the entry in confile | |
1637 | ret = snprintf(tmppath, MAXPATHLEN, "%s/%s/%s", | |
1638 | c->config_path, c->name, fname+1); | |
1639 | if (ret < 0 || ret >= MAXPATHLEN) | |
1640 | return -1; | |
1641 | ret = copy_file(it->elem, tmppath); | |
1642 | if (ret < 0) | |
1643 | return -1; | |
1644 | free(it->elem); | |
1645 | it->elem = strdup(tmppath); | |
1646 | if (!it->elem) { | |
1647 | ERROR("out of memory copying hook path"); | |
1648 | return -1; | |
1649 | } | |
1650 | update_name_and_paths(it->elem, oldc, c->name, c->get_config_path(c)); | |
1651 | } | |
1652 | } | |
1653 | ||
1654 | c->save_config(c, NULL); | |
1655 | return 0; | |
1656 | } | |
1657 | ||
1658 | static void new_hwaddr(char *hwaddr) | |
1659 | { | |
1660 | FILE *f = fopen("/dev/urandom", "r"); | |
1661 | if (f) { | |
1662 | unsigned int seed; | |
1663 | int ret = fread(&seed, sizeof(seed), 1, f); | |
1664 | if (ret != 1) | |
1665 | seed = time(NULL); | |
1666 | fclose(f); | |
1667 | srand(seed); | |
1668 | } else | |
1669 | srand(time(NULL)); | |
1670 | snprintf(hwaddr, 18, "00:16:3e:%02x:%02x:%02x", | |
1671 | rand() % 255, rand() % 255, rand() % 255); | |
1672 | } | |
1673 | ||
1674 | static void network_new_hwaddrs(struct lxc_container *c) | |
1675 | { | |
1676 | struct lxc_list *it; | |
1677 | ||
1678 | lxc_list_for_each(it, &c->lxc_conf->network) { | |
1679 | struct lxc_netdev *n = it->elem; | |
1680 | if (n->hwaddr) | |
1681 | new_hwaddr(n->hwaddr); | |
1682 | } | |
1683 | } | |
1684 | ||
1685 | static int copy_fstab(struct lxc_container *oldc, struct lxc_container *c) | |
1686 | { | |
1687 | char newpath[MAXPATHLEN]; | |
1688 | char *oldpath = oldc->lxc_conf->fstab; | |
1689 | int ret; | |
1690 | ||
1691 | if (!oldpath) | |
1692 | return 0; | |
1693 | ||
1694 | char *p = rindex(oldpath, '/'); | |
1695 | if (!p) | |
1696 | return -1; | |
1697 | ret = snprintf(newpath, MAXPATHLEN, "%s/%s%s", | |
1698 | c->config_path, c->name, p); | |
1699 | if (ret < 0 || ret >= MAXPATHLEN) { | |
1700 | ERROR("error printing new path for %s", oldpath); | |
1701 | return -1; | |
1702 | } | |
1703 | if (file_exists(newpath)) { | |
1704 | ERROR("error: fstab file %s exists", newpath); | |
1705 | return -1; | |
1706 | } | |
1707 | ||
1708 | if (copy_file(oldpath, newpath) < 0) { | |
1709 | ERROR("error: copying %s to %s", oldpath, newpath); | |
1710 | return -1; | |
1711 | } | |
1712 | free(c->lxc_conf->fstab); | |
1713 | c->lxc_conf->fstab = strdup(newpath); | |
1714 | if (!c->lxc_conf->fstab) { | |
1715 | ERROR("error: allocating pathname"); | |
1716 | return -1; | |
1717 | } | |
1718 | ||
1719 | return 0; | |
1720 | } | |
1721 | ||
1722 | static int copy_storage(struct lxc_container *c0, struct lxc_container *c, | |
1723 | const char *newtype, int flags, const char *bdevdata, unsigned long newsize) | |
1724 | { | |
1725 | struct bdev *bdev; | |
1726 | ||
1727 | bdev = bdev_copy(c0->lxc_conf->rootfs.path, c0->name, c->name, | |
1728 | c0->config_path, c->config_path, newtype, !!(flags & LXC_CLONE_SNAPSHOT), | |
1729 | bdevdata, newsize); | |
1730 | if (!bdev) { | |
1731 | ERROR("error copying storage"); | |
1732 | return -1; | |
1733 | } | |
1734 | free(c->lxc_conf->rootfs.path); | |
1735 | c->lxc_conf->rootfs.path = strdup(bdev->src); | |
1736 | bdev_put(bdev); | |
1737 | if (!c->lxc_conf->rootfs.path) | |
1738 | return -1; | |
1739 | // here we could also update all lxc.mount.entries or even | |
1740 | // items in the lxc.mount fstab list. As discussed on m-l, | |
1741 | // we could do either any source paths starting with the | |
1742 | // lxcpath/oldname, or simply anythign which is not a virtual | |
1743 | // fs or a bind mount. | |
1744 | return 0; | |
1745 | } | |
1746 | ||
148e91f5 | 1747 | static int clone_update_rootfs(struct lxc_container *c, int flags, char **hookargs) |
9be53773 SH |
1748 | { |
1749 | int ret = -1; | |
1750 | char path[MAXPATHLEN]; | |
1751 | struct bdev *bdev; | |
1752 | FILE *fout; | |
1753 | pid_t pid; | |
148e91f5 | 1754 | struct lxc_conf *conf = c->lxc_conf; |
9be53773 SH |
1755 | |
1756 | /* update hostname in rootfs */ | |
1757 | /* we're going to mount, so run in a clean namespace to simplify cleanup */ | |
1758 | ||
1759 | pid = fork(); | |
1760 | if (pid < 0) | |
1761 | return -1; | |
1762 | if (pid > 0) | |
1763 | return wait_for_pid(pid); | |
1764 | ||
1765 | if (unshare(CLONE_NEWNS) < 0) { | |
1766 | ERROR("error unsharing mounts"); | |
1767 | exit(1); | |
1768 | } | |
1769 | bdev = bdev_init(c->lxc_conf->rootfs.path, c->lxc_conf->rootfs.mount, NULL); | |
1770 | if (!bdev) | |
1771 | exit(1); | |
1772 | if (bdev->ops->mount(bdev) < 0) | |
1773 | exit(1); | |
148e91f5 SH |
1774 | |
1775 | if (!lxc_list_empty(&conf->hooks[LXCHOOK_CLONE])) { | |
1776 | /* Start of environment variable setup for hooks */ | |
1777 | if (setenv("LXC_NAME", c->name, 1)) { | |
1778 | SYSERROR("failed to set environment variable for container name"); | |
1779 | } | |
1780 | if (setenv("LXC_CONFIG_FILE", conf->rcfile, 1)) { | |
1781 | SYSERROR("failed to set environment variable for config path"); | |
1782 | } | |
1783 | if (setenv("LXC_ROOTFS_MOUNT", conf->rootfs.mount, 1)) { | |
1784 | SYSERROR("failed to set environment variable for rootfs mount"); | |
1785 | } | |
1786 | if (setenv("LXC_ROOTFS_PATH", conf->rootfs.path, 1)) { | |
1787 | SYSERROR("failed to set environment variable for rootfs mount"); | |
1788 | } | |
1789 | ||
1790 | if (run_lxc_hooks(c->name, "clone", conf, hookargs)) { | |
1791 | ERROR("Error executing clone hook for %s", c->name); | |
1792 | exit(1); | |
1793 | } | |
1794 | } | |
1795 | ||
1796 | if (!(flags & LXC_CLONE_KEEPNAME)) { | |
1797 | ret = snprintf(path, MAXPATHLEN, "%s/etc/hostname", bdev->dest); | |
1798 | if (ret < 0 || ret >= MAXPATHLEN) | |
1799 | exit(1); | |
1800 | if (!(fout = fopen(path, "w"))) { | |
1801 | SYSERROR("unable to open %s: ignoring\n", path); | |
1802 | exit(0); | |
1803 | } | |
1804 | if (fprintf(fout, "%s", c->name) < 0) | |
1805 | exit(1); | |
1806 | if (fclose(fout) < 0) | |
1807 | exit(1); | |
9be53773 | 1808 | } |
9be53773 SH |
1809 | exit(0); |
1810 | } | |
1811 | ||
1812 | /* | |
1813 | * We want to support: | |
1814 | sudo lxc-clone -o o1 -n n1 -s -L|-fssize fssize -v|--vgname vgname \ | |
1815 | -p|--lvprefix lvprefix -t|--fstype fstype -B backingstore | |
1816 | ||
1817 | -s [ implies overlayfs] | |
1818 | -s -B overlayfs | |
1819 | -s -B aufs | |
1820 | ||
1821 | only rootfs gets converted (copied/snapshotted) on clone. | |
1822 | */ | |
1823 | ||
1824 | static int create_file_dirname(char *path) | |
1825 | { | |
1826 | char *p = rindex(path, '/'); | |
1827 | int ret; | |
1828 | ||
1829 | if (!p) | |
1830 | return -1; | |
1831 | *p = '\0'; | |
1832 | ret = mkdir(path, 0755); | |
1833 | if (ret && errno != EEXIST) | |
1834 | SYSERROR("creating container path %s\n", path); | |
1835 | *p = '/'; | |
1836 | return ret; | |
1837 | } | |
1838 | ||
1839 | struct lxc_container *lxcapi_clone(struct lxc_container *c, const char *newname, | |
1840 | const char *lxcpath, int flags, | |
148e91f5 SH |
1841 | const char *bdevtype, const char *bdevdata, unsigned long newsize, |
1842 | char **hookargs) | |
9be53773 SH |
1843 | { |
1844 | struct lxc_container *c2 = NULL; | |
1845 | char newpath[MAXPATHLEN]; | |
1846 | int ret; | |
1847 | const char *n, *l; | |
1848 | FILE *fout; | |
1849 | ||
1850 | if (!c || !c->is_defined(c)) | |
1851 | return NULL; | |
1852 | ||
5cee8c50 | 1853 | if (container_mem_lock(c)) |
9be53773 SH |
1854 | return NULL; |
1855 | ||
39dc698c | 1856 | if (!is_stopped(c)) { |
9be53773 SH |
1857 | ERROR("error: Original container (%s) is running", c->name); |
1858 | goto out; | |
1859 | } | |
1860 | ||
1861 | // Make sure the container doesn't yet exist. | |
1862 | n = newname ? newname : c->name; | |
1863 | l = lxcpath ? lxcpath : c->get_config_path(c); | |
1864 | ret = snprintf(newpath, MAXPATHLEN, "%s/%s/config", l, n); | |
1865 | if (ret < 0 || ret >= MAXPATHLEN) { | |
1866 | SYSERROR("clone: failed making config pathname"); | |
1867 | goto out; | |
1868 | } | |
1869 | if (file_exists(newpath)) { | |
1870 | ERROR("error: clone: %s exists", newpath); | |
1871 | goto out; | |
1872 | } | |
1873 | ||
1874 | if (create_file_dirname(newpath) < 0) { | |
1875 | ERROR("Error creating container dir for %s", newpath); | |
1876 | goto out; | |
1877 | } | |
1878 | ||
1879 | // copy the configuration, tweak it as needed, | |
1880 | fout = fopen(newpath, "w"); | |
1881 | if (!fout) { | |
1882 | SYSERROR("open %s", newpath); | |
1883 | goto out; | |
1884 | } | |
1885 | write_config(fout, c->lxc_conf); | |
1886 | fclose(fout); | |
1887 | ||
1888 | if (update_name_and_paths(newpath, c, n, l) < 0) { | |
1889 | ERROR("Error updating name in cloned config"); | |
1890 | goto out; | |
1891 | } | |
1892 | ||
1893 | sprintf(newpath, "%s/%s/rootfs", l, n); | |
1894 | if (mkdir(newpath, 0755) < 0) { | |
1895 | SYSERROR("error creating %s", newpath); | |
1896 | goto out; | |
1897 | } | |
1898 | ||
1899 | c2 = lxc_container_new(n, l); | |
375c2258 | 1900 | if (!c2) { |
9be53773 SH |
1901 | ERROR("clone: failed to create new container (%s %s)", n, l); |
1902 | goto out; | |
1903 | } | |
1904 | ||
1905 | // copy hooks if requested | |
1906 | if (flags & LXC_CLONE_COPYHOOKS) { | |
1907 | ret = copyhooks(c, c2); | |
1908 | if (ret < 0) { | |
1909 | ERROR("error copying hooks"); | |
9be53773 SH |
1910 | goto out; |
1911 | } | |
1912 | } | |
1913 | ||
1914 | if (copy_fstab(c, c2) < 0) { | |
1915 | ERROR("error copying fstab"); | |
9be53773 SH |
1916 | goto out; |
1917 | } | |
1918 | ||
1919 | // update macaddrs | |
1920 | if (!(flags & LXC_CLONE_KEEPMACADDR)) | |
1921 | network_new_hwaddrs(c2); | |
1922 | ||
1923 | // copy/snapshot rootfs's | |
1924 | ret = copy_storage(c, c2, bdevtype, flags, bdevdata, newsize); | |
375c2258 | 1925 | if (ret < 0) |
9be53773 | 1926 | goto out; |
9be53773 | 1927 | |
375c2258 | 1928 | if (!c2->save_config(c2, NULL)) |
9be53773 | 1929 | goto out; |
9be53773 | 1930 | |
148e91f5 | 1931 | if (clone_update_rootfs(c2, flags, hookargs) < 0) |
9be53773 | 1932 | goto out; |
9be53773 SH |
1933 | |
1934 | // TODO: update c's lxc.snapshot = count | |
5cee8c50 | 1935 | container_mem_unlock(c); |
9be53773 SH |
1936 | return c2; |
1937 | ||
1938 | out: | |
5cee8c50 | 1939 | container_mem_unlock(c); |
375c2258 SH |
1940 | if (c2) { |
1941 | c2->destroy(c2); | |
9be53773 | 1942 | lxc_container_put(c2); |
375c2258 | 1943 | } |
9be53773 SH |
1944 | |
1945 | return NULL; | |
1946 | } | |
1947 | ||
afeecbba | 1948 | struct lxc_container *lxc_container_new(const char *name, const char *configpath) |
72d0e1cb SG |
1949 | { |
1950 | struct lxc_container *c; | |
72d0e1cb SG |
1951 | |
1952 | c = malloc(sizeof(*c)); | |
1953 | if (!c) { | |
1954 | fprintf(stderr, "failed to malloc lxc_container\n"); | |
1955 | return NULL; | |
1956 | } | |
1957 | memset(c, 0, sizeof(*c)); | |
1958 | ||
afeecbba SH |
1959 | if (configpath) |
1960 | c->config_path = strdup(configpath); | |
1961 | else | |
67e571de | 1962 | c->config_path = strdup(default_lxc_path()); |
afeecbba | 1963 | |
2a59a681 SH |
1964 | if (!c->config_path) { |
1965 | fprintf(stderr, "Out of memory"); | |
1966 | goto err; | |
1967 | } | |
1968 | ||
72d0e1cb SG |
1969 | c->name = malloc(strlen(name)+1); |
1970 | if (!c->name) { | |
1971 | fprintf(stderr, "Error allocating lxc_container name\n"); | |
1972 | goto err; | |
1973 | } | |
1974 | strcpy(c->name, name); | |
1975 | ||
1976 | c->numthreads = 1; | |
df271a59 | 1977 | if (!(c->slock = lxc_newlock(c->config_path, name))) { |
72d0e1cb SG |
1978 | fprintf(stderr, "failed to create lock\n"); |
1979 | goto err; | |
1980 | } | |
1981 | ||
df271a59 | 1982 | if (!(c->privlock = lxc_newlock(NULL, NULL))) { |
72d0e1cb SG |
1983 | fprintf(stderr, "failed to alloc privlock\n"); |
1984 | goto err; | |
1985 | } | |
1986 | ||
afeecbba | 1987 | if (!set_config_filename(c)) { |
72d0e1cb SG |
1988 | fprintf(stderr, "Error allocating config file pathname\n"); |
1989 | goto err; | |
1990 | } | |
72d0e1cb SG |
1991 | |
1992 | if (file_exists(c->configfile)) | |
1993 | lxcapi_load_config(c, NULL); | |
1994 | ||
3e625e2d SH |
1995 | if (ongoing_create(c) == 2) { |
1996 | ERROR("Error: %s creation was not completed", c->name); | |
1897e3bc SH |
1997 | lxcapi_destroy(c); |
1998 | lxc_conf_free(c->lxc_conf); | |
1999 | c->lxc_conf = NULL; | |
3e625e2d SH |
2000 | } |
2001 | ||
72d0e1cb SG |
2002 | // assign the member functions |
2003 | c->is_defined = lxcapi_is_defined; | |
2004 | c->state = lxcapi_state; | |
2005 | c->is_running = lxcapi_is_running; | |
2006 | c->freeze = lxcapi_freeze; | |
2007 | c->unfreeze = lxcapi_unfreeze; | |
0115f8fd | 2008 | c->console = lxcapi_console; |
72d0e1cb SG |
2009 | c->init_pid = lxcapi_init_pid; |
2010 | c->load_config = lxcapi_load_config; | |
2011 | c->want_daemonize = lxcapi_want_daemonize; | |
2012 | c->start = lxcapi_start; | |
2013 | c->startl = lxcapi_startl; | |
2014 | c->stop = lxcapi_stop; | |
2015 | c->config_file_name = lxcapi_config_file_name; | |
2016 | c->wait = lxcapi_wait; | |
2017 | c->set_config_item = lxcapi_set_config_item; | |
2018 | c->destroy = lxcapi_destroy; | |
2019 | c->save_config = lxcapi_save_config; | |
2020 | c->get_keys = lxcapi_get_keys; | |
2021 | c->create = lxcapi_create; | |
2022 | c->createl = lxcapi_createl; | |
2023 | c->shutdown = lxcapi_shutdown; | |
3e625e2d | 2024 | c->reboot = lxcapi_reboot; |
72d0e1cb SG |
2025 | c->clear_config_item = lxcapi_clear_config_item; |
2026 | c->get_config_item = lxcapi_get_config_item; | |
794dd120 SH |
2027 | c->get_cgroup_item = lxcapi_get_cgroup_item; |
2028 | c->set_cgroup_item = lxcapi_set_cgroup_item; | |
2a59a681 SH |
2029 | c->get_config_path = lxcapi_get_config_path; |
2030 | c->set_config_path = lxcapi_set_config_path; | |
9be53773 | 2031 | c->clone = lxcapi_clone; |
9c83a661 | 2032 | c->get_ips = lxcapi_get_ips; |
72d0e1cb SG |
2033 | |
2034 | /* we'll allow the caller to update these later */ | |
ab1bf971 | 2035 | if (lxc_log_init(NULL, "none", NULL, "lxc_container", 0, c->config_path)) { |
72d0e1cb SG |
2036 | fprintf(stderr, "failed to open log\n"); |
2037 | goto err; | |
2038 | } | |
2039 | ||
72d0e1cb SG |
2040 | return c; |
2041 | ||
2042 | err: | |
2043 | lxc_container_free(c); | |
2044 | return NULL; | |
2045 | } | |
2046 | ||
4a7c7daa | 2047 | int lxc_get_wait_states(const char **states) |
72d0e1cb SG |
2048 | { |
2049 | int i; | |
2050 | ||
2051 | if (states) | |
2052 | for (i=0; i<MAX_STATE; i++) | |
2053 | states[i] = lxc_state2str(i); | |
2054 | return MAX_STATE; | |
2055 | } |