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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 |
a0e93eeb | 22 | #include <stdarg.h> |
71454076 | 23 | #include <pthread.h> |
9be53773 SH |
24 | #include <unistd.h> |
25 | #include <sys/types.h> | |
26 | #include <sys/wait.h> | |
4de2791f | 27 | #include <sys/mount.h> |
9be53773 | 28 | #include <errno.h> |
93dc5327 | 29 | #include <fcntl.h> |
9be53773 | 30 | #include <sched.h> |
f5dd1d53 | 31 | #include <dirent.h> |
9be53773 | 32 | #include "config.h" |
72d0e1cb SG |
33 | #include "lxc.h" |
34 | #include "state.h" | |
948955a2 | 35 | #include <lxc/lxccontainer.h> |
72d0e1cb | 36 | #include "conf.h" |
72d0e1cb | 37 | #include "confile.h" |
b5159817 | 38 | #include "console.h" |
72d0e1cb SG |
39 | #include "cgroup.h" |
40 | #include "commands.h" | |
b6b918a1 | 41 | #include "version.h" |
72d0e1cb | 42 | #include "log.h" |
9be53773 | 43 | #include "bdev.h" |
6a44839f | 44 | #include "utils.h" |
a0e93eeb | 45 | #include "attach.h" |
2a59a681 | 46 | #include <lxc/utils.h> |
e51d4895 | 47 | #include <lxc/monitor.h> |
e768f9c0 | 48 | #include <lxc/namespace.h> |
9c83a661 | 49 | #include <sched.h> |
9c83a661 | 50 | #include <arpa/inet.h> |
4ba0d9af SG |
51 | |
52 | #if HAVE_IFADDRS_H | |
9c83a661 | 53 | #include <ifaddrs.h> |
4ba0d9af SG |
54 | #else |
55 | #include <../include/ifaddrs.h> | |
56 | #endif | |
72d0e1cb | 57 | |
dfb31b25 SH |
58 | #ifndef HAVE_GETLINE |
59 | #ifdef HAVE_FGETLN | |
60 | #include <../include/getline.h> | |
61 | #endif | |
62 | #endif | |
63 | ||
72d0e1cb SG |
64 | lxc_log_define(lxc_container, lxc); |
65 | ||
3e625e2d SH |
66 | static bool file_exists(char *f) |
67 | { | |
68 | struct stat statbuf; | |
69 | ||
70 | return stat(f, &statbuf) == 0; | |
71 | } | |
72 | ||
a41f104b SH |
73 | static bool config_file_exists(const char *lxcpath, const char *cname) |
74 | { | |
75 | /* $lxcpath + '/' + $cname + '/config' + \0 */ | |
76 | int ret, len = strlen(lxcpath) + strlen(cname) + 9; | |
77 | char *fname = alloca(len); | |
78 | ||
79 | ret = snprintf(fname, len, "%s/%s/config", lxcpath, cname); | |
80 | if (ret < 0 || ret >= len) | |
81 | return false; | |
82 | ||
83 | return file_exists(fname); | |
84 | } | |
85 | ||
3e625e2d SH |
86 | /* |
87 | * A few functions to help detect when a container creation failed. | |
88 | * If a container creation was killed partway through, then trying | |
89 | * to actually start that container could harm the host. We detect | |
90 | * this by creating a 'partial' file under the container directory, | |
91 | * and keeping an advisory lock. When container creation completes, | |
92 | * we remove that file. When we load or try to start a container, if | |
93 | * we find that file, without a flock, we remove the container. | |
94 | */ | |
95 | int ongoing_create(struct lxc_container *c) | |
96 | { | |
97 | int len = strlen(c->config_path) + strlen(c->name) + 10; | |
98 | char *path = alloca(len); | |
99 | int fd, ret; | |
93dc5327 SH |
100 | struct flock lk; |
101 | ||
3e625e2d SH |
102 | ret = snprintf(path, len, "%s/%s/partial", c->config_path, c->name); |
103 | if (ret < 0 || ret >= len) { | |
104 | ERROR("Error writing partial pathname"); | |
105 | return -1; | |
106 | } | |
107 | ||
108 | if (!file_exists(path)) | |
109 | return 0; | |
025ed0f3 SH |
110 | process_lock(); |
111 | fd = open(path, O_RDWR); | |
112 | process_unlock(); | |
113 | if (fd < 0) { | |
3e625e2d SH |
114 | // give benefit of the doubt |
115 | SYSERROR("Error opening partial file"); | |
3e625e2d SH |
116 | return 0; |
117 | } | |
93dc5327 SH |
118 | lk.l_type = F_WRLCK; |
119 | lk.l_whence = SEEK_SET; | |
120 | lk.l_start = 0; | |
121 | lk.l_len = 0; | |
122 | lk.l_pid = -1; | |
123 | if (fcntl(fd, F_GETLK, &lk) == 0 && lk.l_pid != -1) { | |
3e625e2d | 124 | // create is still ongoing |
025ed0f3 | 125 | process_lock(); |
3e625e2d SH |
126 | close(fd); |
127 | process_unlock(); | |
128 | return 1; | |
129 | } | |
130 | // create completed but partial is still there. | |
025ed0f3 | 131 | process_lock(); |
3e625e2d SH |
132 | close(fd); |
133 | process_unlock(); | |
134 | return 2; | |
135 | } | |
136 | ||
137 | int create_partial(struct lxc_container *c) | |
138 | { | |
139 | // $lxcpath + '/' + $name + '/partial' + \0 | |
140 | int len = strlen(c->config_path) + strlen(c->name) + 10; | |
141 | char *path = alloca(len); | |
142 | int fd, ret; | |
93dc5327 SH |
143 | struct flock lk; |
144 | ||
3e625e2d SH |
145 | ret = snprintf(path, len, "%s/%s/partial", c->config_path, c->name); |
146 | if (ret < 0 || ret >= len) { | |
147 | ERROR("Error writing partial pathname"); | |
148 | return -1; | |
149 | } | |
025ed0f3 | 150 | process_lock(); |
93dc5327 | 151 | if ((fd=open(path, O_RDWR | O_CREAT | O_EXCL, 0755)) < 0) { |
3e625e2d SH |
152 | SYSERROR("Erorr creating partial file"); |
153 | process_unlock(); | |
154 | return -1; | |
155 | } | |
93dc5327 SH |
156 | lk.l_type = F_WRLCK; |
157 | lk.l_whence = SEEK_SET; | |
158 | lk.l_start = 0; | |
159 | lk.l_len = 0; | |
160 | if (fcntl(fd, F_SETLKW, &lk) < 0) { | |
3e625e2d SH |
161 | SYSERROR("Error locking partial file %s", path); |
162 | close(fd); | |
163 | process_unlock(); | |
164 | return -1; | |
165 | } | |
166 | process_unlock(); | |
167 | ||
168 | return fd; | |
169 | } | |
170 | ||
171 | void remove_partial(struct lxc_container *c, int fd) | |
172 | { | |
173 | // $lxcpath + '/' + $name + '/partial' + \0 | |
174 | int len = strlen(c->config_path) + strlen(c->name) + 10; | |
175 | char *path = alloca(len); | |
176 | int ret; | |
177 | ||
025ed0f3 | 178 | process_lock(); |
3e625e2d | 179 | close(fd); |
025ed0f3 | 180 | process_unlock(); |
3e625e2d SH |
181 | ret = snprintf(path, len, "%s/%s/partial", c->config_path, c->name); |
182 | if (ret < 0 || ret >= len) { | |
183 | ERROR("Error writing partial pathname"); | |
184 | return; | |
185 | } | |
3e625e2d SH |
186 | if (unlink(path) < 0) |
187 | SYSERROR("Error unlink partial file %s", path); | |
3e625e2d SH |
188 | } |
189 | ||
72d0e1cb | 190 | /* LOCKING |
3bc449ed SH |
191 | * 1. container_mem_lock(c) protects the struct lxc_container from multiple threads. |
192 | * 2. container_disk_lock(c) protects the on-disk container data - in particular the | |
193 | * container configuration file. | |
194 | * The container_disk_lock also takes the container_mem_lock. | |
195 | * 3. thread_mutex protects process data (ex: fd table) from multiple threads. | |
72d0e1cb SG |
196 | * NOTHING mutexes two independent programs with their own struct |
197 | * lxc_container for the same c->name, between API calls. For instance, | |
198 | * c->config_read(); c->start(); Between those calls, data on disk | |
199 | * could change (which shouldn't bother the caller unless for instance | |
200 | * the rootfs get moved). c->config_read(); update; c->config_write(); | |
201 | * Two such updaters could race. The callers should therefore check their | |
202 | * results. Trying to prevent that would necessarily expose us to deadlocks | |
203 | * due to hung callers. So I prefer to keep the locks only within our own | |
204 | * functions, not across functions. | |
205 | * | |
3bc449ed | 206 | * If you're going to clone while holding a lxccontainer, increment |
72d0e1cb SG |
207 | * c->numthreads (under privlock) before forking. When deleting, |
208 | * decrement numthreads under privlock, then if it hits 0 you can delete. | |
209 | * Do not ever use a lxccontainer whose numthreads you did not bump. | |
210 | */ | |
211 | ||
212 | static void lxc_container_free(struct lxc_container *c) | |
213 | { | |
214 | if (!c) | |
215 | return; | |
216 | ||
217 | if (c->configfile) { | |
218 | free(c->configfile); | |
219 | c->configfile = NULL; | |
220 | } | |
221 | if (c->error_string) { | |
222 | free(c->error_string); | |
223 | c->error_string = NULL; | |
224 | } | |
d95db067 | 225 | if (c->slock) { |
df271a59 | 226 | lxc_putlock(c->slock); |
d95db067 DE |
227 | c->slock = NULL; |
228 | } | |
72d0e1cb | 229 | if (c->privlock) { |
df271a59 | 230 | lxc_putlock(c->privlock); |
72d0e1cb SG |
231 | c->privlock = NULL; |
232 | } | |
233 | if (c->name) { | |
234 | free(c->name); | |
235 | c->name = NULL; | |
236 | } | |
d95db067 DE |
237 | if (c->lxc_conf) { |
238 | lxc_conf_free(c->lxc_conf); | |
239 | c->lxc_conf = NULL; | |
240 | } | |
2a59a681 SH |
241 | if (c->config_path) { |
242 | free(c->config_path); | |
243 | c->config_path = NULL; | |
244 | } | |
72d0e1cb SG |
245 | free(c); |
246 | } | |
247 | ||
43d1aa34 SH |
248 | /* |
249 | * Consider the following case: | |
250 | freer | racing get()er | |
251 | ================================================================== | |
252 | lxc_container_put() | lxc_container_get() | |
253 | \ lxclock(c->privlock) | c->numthreads < 1? (no) | |
254 | \ c->numthreads = 0 | \ lxclock(c->privlock) -> waits | |
255 | \ lxcunlock() | \ | |
256 | \ lxc_container_free() | \ lxclock() returns | |
257 | | \ c->numthreads < 1 -> return 0 | |
258 | \ \ (free stuff) | | |
259 | \ \ sem_destroy(privlock) | | |
260 | ||
261 | * When the get()er checks numthreads the first time, one of the following | |
262 | * is true: | |
263 | * 1. freer has set numthreads = 0. get() returns 0 | |
264 | * 2. freer is between lxclock and setting numthreads to 0. get()er will | |
265 | * sem_wait on privlock, get lxclock after freer() drops it, then see | |
266 | * numthreads is 0 and exit without touching lxclock again.. | |
267 | * 3. freer has not yet locked privlock. If get()er runs first, then put()er | |
268 | * will see --numthreads = 1 and not call lxc_container_free(). | |
269 | */ | |
270 | ||
72d0e1cb SG |
271 | int lxc_container_get(struct lxc_container *c) |
272 | { | |
273 | if (!c) | |
274 | return 0; | |
275 | ||
43d1aa34 SH |
276 | // if someone else has already started freeing the container, don't |
277 | // try to take the lock, which may be invalid | |
278 | if (c->numthreads < 1) | |
279 | return 0; | |
280 | ||
5cee8c50 | 281 | if (container_mem_lock(c)) |
72d0e1cb SG |
282 | return 0; |
283 | if (c->numthreads < 1) { | |
284 | // bail without trying to unlock, bc the privlock is now probably | |
285 | // in freed memory | |
286 | return 0; | |
287 | } | |
288 | c->numthreads++; | |
5cee8c50 | 289 | container_mem_unlock(c); |
72d0e1cb SG |
290 | return 1; |
291 | } | |
292 | ||
293 | int lxc_container_put(struct lxc_container *c) | |
294 | { | |
295 | if (!c) | |
296 | return -1; | |
5cee8c50 | 297 | if (container_mem_lock(c)) |
72d0e1cb SG |
298 | return -1; |
299 | if (--c->numthreads < 1) { | |
5cee8c50 | 300 | container_mem_unlock(c); |
72d0e1cb SG |
301 | lxc_container_free(c); |
302 | return 1; | |
303 | } | |
5cee8c50 | 304 | container_mem_unlock(c); |
72d0e1cb SG |
305 | return 0; |
306 | } | |
307 | ||
72d0e1cb SG |
308 | static bool lxcapi_is_defined(struct lxc_container *c) |
309 | { | |
310 | struct stat statbuf; | |
311 | bool ret = false; | |
312 | int statret; | |
313 | ||
314 | if (!c) | |
315 | return false; | |
316 | ||
5cee8c50 | 317 | if (container_mem_lock(c)) |
72d0e1cb SG |
318 | return false; |
319 | if (!c->configfile) | |
320 | goto out; | |
321 | statret = stat(c->configfile, &statbuf); | |
322 | if (statret != 0) | |
323 | goto out; | |
324 | ret = true; | |
325 | ||
326 | out: | |
5cee8c50 | 327 | container_mem_unlock(c); |
72d0e1cb SG |
328 | return ret; |
329 | } | |
330 | ||
331 | static const char *lxcapi_state(struct lxc_container *c) | |
332 | { | |
72d0e1cb SG |
333 | lxc_state_t s; |
334 | ||
335 | if (!c) | |
336 | return NULL; | |
13f5be62 | 337 | s = lxc_getstate(c->name, c->config_path); |
39dc698c | 338 | return lxc_state2str(s); |
72d0e1cb SG |
339 | } |
340 | ||
39dc698c | 341 | static bool is_stopped(struct lxc_container *c) |
794dd120 SH |
342 | { |
343 | lxc_state_t s; | |
13f5be62 | 344 | s = lxc_getstate(c->name, c->config_path); |
794dd120 SH |
345 | return (s == STOPPED); |
346 | } | |
347 | ||
72d0e1cb SG |
348 | static bool lxcapi_is_running(struct lxc_container *c) |
349 | { | |
350 | const char *s; | |
351 | ||
352 | if (!c) | |
353 | return false; | |
354 | s = lxcapi_state(c); | |
355 | if (!s || strcmp(s, "STOPPED") == 0) | |
356 | return false; | |
357 | return true; | |
358 | } | |
359 | ||
360 | static bool lxcapi_freeze(struct lxc_container *c) | |
361 | { | |
362 | int ret; | |
363 | if (!c) | |
364 | return false; | |
365 | ||
9123e471 | 366 | ret = lxc_freeze(c->name, c->config_path); |
72d0e1cb SG |
367 | if (ret) |
368 | return false; | |
369 | return true; | |
370 | } | |
371 | ||
372 | static bool lxcapi_unfreeze(struct lxc_container *c) | |
373 | { | |
374 | int ret; | |
375 | if (!c) | |
376 | return false; | |
377 | ||
9123e471 | 378 | ret = lxc_unfreeze(c->name, c->config_path); |
72d0e1cb SG |
379 | if (ret) |
380 | return false; | |
381 | return true; | |
382 | } | |
383 | ||
b5159817 | 384 | static int lxcapi_console_getfd(struct lxc_container *c, int *ttynum, int *masterfd) |
0115f8fd DE |
385 | { |
386 | int ttyfd; | |
387 | if (!c) | |
388 | return -1; | |
389 | ||
b5159817 | 390 | ttyfd = lxc_console_getfd(c, ttynum, masterfd); |
0115f8fd DE |
391 | return ttyfd; |
392 | } | |
393 | ||
b5159817 DE |
394 | static int lxcapi_console(struct lxc_container *c, int ttynum, int stdinfd, |
395 | int stdoutfd, int stderrfd, int escape) | |
396 | { | |
397 | return lxc_console(c, ttynum, stdinfd, stdoutfd, stderrfd, escape); | |
398 | } | |
399 | ||
72d0e1cb SG |
400 | static pid_t lxcapi_init_pid(struct lxc_container *c) |
401 | { | |
72d0e1cb SG |
402 | if (!c) |
403 | return -1; | |
404 | ||
5cee8c50 | 405 | return lxc_cmd_get_init_pid(c->name, c->config_path); |
72d0e1cb SG |
406 | } |
407 | ||
12a50cc6 | 408 | static bool load_config_locked(struct lxc_container *c, const char *fname) |
8eb5694b SH |
409 | { |
410 | if (!c->lxc_conf) | |
411 | c->lxc_conf = lxc_conf_init(); | |
412 | if (c->lxc_conf && !lxc_config_read(fname, c->lxc_conf)) | |
413 | return true; | |
414 | return false; | |
415 | } | |
416 | ||
12a50cc6 | 417 | static bool lxcapi_load_config(struct lxc_container *c, const char *alt_file) |
72d0e1cb | 418 | { |
39dc698c SH |
419 | bool ret = false, need_disklock = false; |
420 | int lret; | |
12a50cc6 | 421 | const char *fname; |
72d0e1cb SG |
422 | if (!c) |
423 | return false; | |
424 | ||
425 | fname = c->configfile; | |
426 | if (alt_file) | |
427 | fname = alt_file; | |
428 | if (!fname) | |
429 | return false; | |
39dc698c SH |
430 | /* |
431 | * If we're reading something other than the container's config, | |
432 | * we only need to lock the in-memory container. If loading the | |
433 | * container's config file, take the disk lock. | |
434 | */ | |
435 | if (strcmp(fname, c->configfile) == 0) | |
436 | need_disklock = true; | |
437 | ||
438 | if (need_disklock) | |
439 | lret = container_disk_lock(c); | |
440 | else | |
441 | lret = container_mem_lock(c); | |
442 | if (lret) | |
72d0e1cb | 443 | return false; |
39dc698c | 444 | |
8eb5694b | 445 | ret = load_config_locked(c, fname); |
39dc698c SH |
446 | |
447 | if (need_disklock) | |
448 | container_disk_unlock(c); | |
449 | else | |
450 | container_mem_unlock(c); | |
72d0e1cb SG |
451 | return ret; |
452 | } | |
453 | ||
454 | static void lxcapi_want_daemonize(struct lxc_container *c) | |
455 | { | |
497a2995 | 456 | if (!c || !c->lxc_conf) |
72d0e1cb | 457 | return; |
f02abefe | 458 | if (container_mem_lock(c)) { |
3bc449ed SH |
459 | ERROR("Error getting mem lock"); |
460 | return; | |
461 | } | |
72d0e1cb | 462 | c->daemonize = 1; |
83758ed0 ÇO |
463 | /* daemonize implies close_all_fds so set it */ |
464 | c->lxc_conf->close_all_fds = 1; | |
3bc449ed | 465 | container_mem_unlock(c); |
72d0e1cb SG |
466 | } |
467 | ||
49badbbe | 468 | static bool lxcapi_want_close_all_fds(struct lxc_container *c) |
130a1888 ÇO |
469 | { |
470 | if (!c || !c->lxc_conf) | |
49badbbe | 471 | return false; |
130a1888 ÇO |
472 | if (container_mem_lock(c)) { |
473 | ERROR("Error getting mem lock"); | |
49badbbe | 474 | return false; |
130a1888 ÇO |
475 | } |
476 | c->lxc_conf->close_all_fds = 1; | |
477 | container_mem_unlock(c); | |
49badbbe | 478 | return true; |
130a1888 ÇO |
479 | } |
480 | ||
12a50cc6 | 481 | static bool lxcapi_wait(struct lxc_container *c, const char *state, int timeout) |
7a44c8b4 SG |
482 | { |
483 | int ret; | |
484 | ||
485 | if (!c) | |
486 | return false; | |
487 | ||
67e571de | 488 | ret = lxc_wait(c->name, state, timeout, c->config_path); |
7a44c8b4 SG |
489 | return ret == 0; |
490 | } | |
491 | ||
492 | ||
493 | static bool wait_on_daemonized_start(struct lxc_container *c) | |
494 | { | |
495 | /* we'll probably want to make this timeout configurable? */ | |
697fa639 | 496 | int timeout = 5, ret, status; |
7a44c8b4 | 497 | |
697fa639 SH |
498 | /* |
499 | * our child is going to fork again, then exit. reap the | |
500 | * child | |
501 | */ | |
502 | ret = wait(&status); | |
503 | if (ret == -1 || !WIFEXITED(status) || WEXITSTATUS(status) != 0) | |
504 | DEBUG("failed waiting for first dual-fork child"); | |
7a44c8b4 SG |
505 | return lxcapi_wait(c, "RUNNING", timeout); |
506 | } | |
507 | ||
72d0e1cb SG |
508 | /* |
509 | * I can't decide if it'd be more convenient for callers if we accept '...', | |
510 | * or a null-terminated array (i.e. execl vs execv) | |
511 | */ | |
12a50cc6 | 512 | static bool lxcapi_start(struct lxc_container *c, int useinit, char * const argv[]) |
72d0e1cb SG |
513 | { |
514 | int ret; | |
515 | struct lxc_conf *conf; | |
516 | int daemonize = 0; | |
517 | char *default_args[] = { | |
518 | "/sbin/init", | |
519 | '\0', | |
520 | }; | |
521 | ||
522 | /* container exists */ | |
523 | if (!c) | |
524 | return false; | |
525 | /* container has been setup */ | |
526 | if (!c->lxc_conf) | |
527 | return false; | |
528 | ||
3e625e2d SH |
529 | if ((ret = ongoing_create(c)) < 0) { |
530 | ERROR("Error checking for incomplete creation"); | |
531 | return false; | |
532 | } | |
533 | if (ret == 2) { | |
534 | ERROR("Error: %s creation was not completed", c->name); | |
535 | c->destroy(c); | |
536 | return false; | |
537 | } else if (ret == 1) { | |
538 | ERROR("Error: creation of %s is ongoing", c->name); | |
539 | return false; | |
540 | } | |
541 | ||
72d0e1cb SG |
542 | /* is this app meant to be run through lxcinit, as in lxc-execute? */ |
543 | if (useinit && !argv) | |
544 | return false; | |
545 | ||
5cee8c50 | 546 | if (container_mem_lock(c)) |
72d0e1cb SG |
547 | return false; |
548 | conf = c->lxc_conf; | |
549 | daemonize = c->daemonize; | |
5cee8c50 | 550 | container_mem_unlock(c); |
72d0e1cb SG |
551 | |
552 | if (useinit) { | |
13f5be62 | 553 | ret = lxc_execute(c->name, argv, 1, conf, c->config_path); |
72d0e1cb SG |
554 | return ret == 0 ? true : false; |
555 | } | |
556 | ||
557 | if (!argv) | |
558 | argv = default_args; | |
559 | ||
560 | /* | |
561 | * say, I'm not sure - what locks do we want here? Any? | |
562 | * Is liblxc's locking enough here to protect the on disk | |
563 | * container? We don't want to exclude things like lxc_info | |
564 | * while container is running... | |
565 | */ | |
566 | if (daemonize) { | |
567 | if (!lxc_container_get(c)) | |
568 | return false; | |
e51d4895 | 569 | lxc_monitord_spawn(c->config_path); |
71454076 | 570 | |
72d0e1cb SG |
571 | pid_t pid = fork(); |
572 | if (pid < 0) { | |
573 | lxc_container_put(c); | |
574 | return false; | |
575 | } | |
025ed0f3 SH |
576 | if (pid != 0) |
577 | return wait_on_daemonized_start(c); | |
578 | ||
579 | process_unlock(); // we're no longer sharing | |
697fa639 SH |
580 | /* second fork to be reparented by init */ |
581 | pid = fork(); | |
582 | if (pid < 0) { | |
583 | SYSERROR("Error doing dual-fork"); | |
584 | return false; | |
585 | } | |
586 | if (pid != 0) | |
587 | exit(0); | |
72d0e1cb | 588 | /* like daemon(), chdir to / and redirect 0,1,2 to /dev/null */ |
c278cef2 SH |
589 | if (chdir("/")) { |
590 | SYSERROR("Error chdir()ing to /."); | |
591 | return false; | |
592 | } | |
72d0e1cb SG |
593 | close(0); |
594 | close(1); | |
595 | close(2); | |
eddaaafd | 596 | open("/dev/zero", O_RDONLY); |
72d0e1cb SG |
597 | open("/dev/null", O_RDWR); |
598 | open("/dev/null", O_RDWR); | |
599 | setsid(); | |
600 | } | |
601 | ||
72d0e1cb SG |
602 | reboot: |
603 | conf->reboot = 0; | |
13f5be62 | 604 | ret = lxc_start(c->name, argv, conf, c->config_path); |
72d0e1cb SG |
605 | |
606 | if (conf->reboot) { | |
607 | INFO("container requested reboot"); | |
608 | conf->reboot = 0; | |
72d0e1cb SG |
609 | goto reboot; |
610 | } | |
611 | ||
612 | if (daemonize) { | |
613 | lxc_container_put(c); | |
614 | exit (ret == 0 ? true : false); | |
615 | } else { | |
616 | return (ret == 0 ? true : false); | |
617 | } | |
618 | } | |
619 | ||
620 | /* | |
621 | * note there MUST be an ending NULL | |
622 | */ | |
623 | static bool lxcapi_startl(struct lxc_container *c, int useinit, ...) | |
624 | { | |
625 | va_list ap; | |
a0e93eeb | 626 | char **inargs = NULL; |
72d0e1cb SG |
627 | bool bret = false; |
628 | ||
629 | /* container exists */ | |
630 | if (!c) | |
631 | return false; | |
632 | ||
72d0e1cb | 633 | va_start(ap, useinit); |
a0e93eeb | 634 | inargs = lxc_va_arg_list_to_argv(ap, 0, 1); |
72d0e1cb SG |
635 | va_end(ap); |
636 | ||
a0e93eeb CS |
637 | if (!inargs) { |
638 | ERROR("Memory allocation error."); | |
639 | goto out; | |
72d0e1cb SG |
640 | } |
641 | ||
a0e93eeb CS |
642 | /* pass NULL if no arguments were supplied */ |
643 | bret = lxcapi_start(c, useinit, *inargs ? inargs : NULL); | |
72d0e1cb SG |
644 | |
645 | out: | |
646 | if (inargs) { | |
4e03ae57 DE |
647 | char **arg; |
648 | for (arg = inargs; *arg; arg++) | |
649 | free(*arg); | |
72d0e1cb SG |
650 | free(inargs); |
651 | } | |
652 | ||
653 | return bret; | |
654 | } | |
655 | ||
656 | static bool lxcapi_stop(struct lxc_container *c) | |
657 | { | |
658 | int ret; | |
659 | ||
660 | if (!c) | |
661 | return false; | |
662 | ||
ef6e34ee | 663 | ret = lxc_cmd_stop(c->name, c->config_path); |
72d0e1cb SG |
664 | |
665 | return ret == 0; | |
72d0e1cb SG |
666 | } |
667 | ||
72d0e1cb SG |
668 | /* |
669 | * create the standard expected container dir | |
670 | */ | |
671 | static bool create_container_dir(struct lxc_container *c) | |
672 | { | |
673 | char *s; | |
674 | int len, ret; | |
675 | ||
2a59a681 | 676 | len = strlen(c->config_path) + strlen(c->name) + 2; |
72d0e1cb SG |
677 | s = malloc(len); |
678 | if (!s) | |
679 | return false; | |
2a59a681 | 680 | ret = snprintf(s, len, "%s/%s", c->config_path, c->name); |
72d0e1cb SG |
681 | if (ret < 0 || ret >= len) { |
682 | free(s); | |
683 | return false; | |
684 | } | |
685 | ret = mkdir(s, 0755); | |
686 | if (ret) { | |
687 | if (errno == EEXIST) | |
688 | ret = 0; | |
689 | else | |
690 | SYSERROR("failed to create container path for %s\n", c->name); | |
691 | } | |
692 | free(s); | |
693 | return ret == 0; | |
694 | } | |
695 | ||
1897e3bc SH |
696 | static const char *lxcapi_get_config_path(struct lxc_container *c); |
697 | static bool lxcapi_set_config_item(struct lxc_container *c, const char *key, const char *v); | |
698 | ||
72d0e1cb | 699 | /* |
1897e3bc SH |
700 | * do_bdev_create: thin wrapper around bdev_create(). Like bdev_create(), |
701 | * it returns a mounted bdev on success, NULL on error. | |
72d0e1cb | 702 | */ |
1897e3bc SH |
703 | static struct bdev *do_bdev_create(struct lxc_container *c, const char *type, |
704 | struct bdev_specs *specs) | |
705 | { | |
706 | char *dest; | |
1897e3bc SH |
707 | size_t len; |
708 | struct bdev *bdev; | |
709 | int ret; | |
710 | ||
cd219ae6 SY |
711 | /* rootfs.path or lxcpath/lxcname/rootfs */ |
712 | if (c->lxc_conf->rootfs.path && access(c->lxc_conf->rootfs.path, F_OK) == 0) { | |
cf465fe4 SH |
713 | const char *rpath = c->lxc_conf->rootfs.path; |
714 | len = strlen(rpath) + 1; | |
cd219ae6 | 715 | dest = alloca(len); |
cf465fe4 | 716 | ret = snprintf(dest, len, "%s", rpath); |
cd219ae6 | 717 | } else { |
cf465fe4 | 718 | const char *lxcpath = lxcapi_get_config_path(c); |
cd219ae6 SY |
719 | len = strlen(c->name) + strlen(lxcpath) + 9; |
720 | dest = alloca(len); | |
721 | ret = snprintf(dest, len, "%s/%s/rootfs", lxcpath, c->name); | |
722 | } | |
1897e3bc SH |
723 | if (ret < 0 || ret >= len) |
724 | return NULL; | |
725 | ||
726 | bdev = bdev_create(dest, type, c->name, specs); | |
d44e88c2 SH |
727 | if (!bdev) { |
728 | ERROR("Failed to create backing store type %s\n", type); | |
1897e3bc | 729 | return NULL; |
d44e88c2 SH |
730 | } |
731 | ||
1897e3bc | 732 | lxcapi_set_config_item(c, "lxc.rootfs", bdev->src); |
cf3ef16d SH |
733 | |
734 | /* if we are not root, chown the rootfs dir to root in the | |
735 | * target uidmap */ | |
736 | ||
737 | if (geteuid() != 0) { | |
c4d10a05 SH |
738 | if (chown_mapped_root(bdev->dest, c->lxc_conf) < 0) { |
739 | ERROR("Error chowning %s to container root\n", bdev->dest); | |
cf3ef16d SH |
740 | bdev_put(bdev); |
741 | return NULL; | |
742 | } | |
743 | } | |
744 | ||
1897e3bc SH |
745 | return bdev; |
746 | } | |
747 | ||
cbee8106 SH |
748 | /* |
749 | * Given the '-t' template option to lxc-create, figure out what to | |
750 | * do. If the template is a full executable path, use that. If it | |
85db5535 DE |
751 | * is something like 'sshd', then return $templatepath/lxc-sshd. |
752 | * On success return the template, on error return NULL. | |
cbee8106 | 753 | */ |
85db5535 | 754 | static char *get_template_path(const char *t) |
cbee8106 SH |
755 | { |
756 | int ret, len; | |
757 | char *tpath; | |
758 | ||
cbee8106 SH |
759 | if (t[0] == '/' && access(t, X_OK) == 0) { |
760 | tpath = strdup(t); | |
cbee8106 SH |
761 | return tpath; |
762 | } | |
763 | ||
764 | len = strlen(LXCTEMPLATEDIR) + strlen(t) + strlen("/lxc-") + 1; | |
765 | tpath = malloc(len); | |
766 | if (!tpath) | |
85db5535 | 767 | return NULL; |
cbee8106 SH |
768 | ret = snprintf(tpath, len, "%s/lxc-%s", LXCTEMPLATEDIR, t); |
769 | if (ret < 0 || ret >= len) { | |
770 | free(tpath); | |
85db5535 | 771 | return NULL; |
cbee8106 SH |
772 | } |
773 | if (access(tpath, X_OK) < 0) { | |
774 | SYSERROR("bad template: %s\n", t); | |
775 | free(tpath); | |
85db5535 | 776 | return NULL; |
cbee8106 SH |
777 | } |
778 | ||
779 | return tpath; | |
780 | } | |
781 | ||
96b3cb40 | 782 | static char *lxcbasename(char *path) |
72d0e1cb | 783 | { |
96b3cb40 SH |
784 | char *p = path + strlen(path) - 1; |
785 | while (*p != '/' && p > path) | |
786 | p--; | |
787 | return p; | |
788 | } | |
72d0e1cb | 789 | |
dc23c1c8 | 790 | static bool create_run_template(struct lxc_container *c, char *tpath, bool quiet, |
96b3cb40 SH |
791 | char *const argv[]) |
792 | { | |
793 | pid_t pid; | |
72d0e1cb | 794 | |
72d0e1cb | 795 | if (!tpath) |
96b3cb40 | 796 | return true; |
72d0e1cb SG |
797 | |
798 | pid = fork(); | |
799 | if (pid < 0) { | |
800 | SYSERROR("failed to fork task for container creation template\n"); | |
96b3cb40 | 801 | return false; |
72d0e1cb SG |
802 | } |
803 | ||
804 | if (pid == 0) { // child | |
1897e3bc SH |
805 | char *patharg, *namearg, *rootfsarg, *src; |
806 | struct bdev *bdev = NULL; | |
72d0e1cb | 807 | int i; |
96b3cb40 SH |
808 | int ret, len, nargs = 0; |
809 | char **newargv; | |
cf3ef16d | 810 | struct lxc_conf *conf = c->lxc_conf; |
72d0e1cb | 811 | |
025ed0f3 | 812 | process_unlock(); // we're no longer sharing |
dc23c1c8 SH |
813 | if (quiet) { |
814 | close(0); | |
815 | close(1); | |
816 | close(2); | |
817 | open("/dev/zero", O_RDONLY); | |
818 | open("/dev/null", O_RDWR); | |
819 | open("/dev/null", O_RDWR); | |
820 | } | |
1897e3bc SH |
821 | |
822 | src = c->lxc_conf->rootfs.path; | |
823 | /* | |
824 | * for an overlayfs create, what the user wants is the template to fill | |
825 | * in what will become the readonly lower layer. So don't mount for | |
826 | * the template | |
827 | */ | |
828 | if (strncmp(src, "overlayfs:", 10) == 0) { | |
829 | src = overlayfs_getlower(src+10); | |
830 | } | |
831 | bdev = bdev_init(src, c->lxc_conf->rootfs.mount, NULL); | |
832 | if (!bdev) { | |
833 | ERROR("Error opening rootfs"); | |
834 | exit(1); | |
835 | } | |
836 | ||
4de2791f | 837 | if (geteuid() == 0) { |
cf3ef16d SH |
838 | if (unshare(CLONE_NEWNS) < 0) { |
839 | ERROR("error unsharing mounts"); | |
840 | exit(1); | |
841 | } | |
4de2791f SH |
842 | if (detect_shared_rootfs()) { |
843 | if (mount("", "", NULL, MS_SLAVE|MS_REC, 0)) { | |
844 | SYSERROR("Failed to make / rslave to run template"); | |
845 | ERROR("Continuing..."); | |
846 | } | |
847 | } | |
848 | } | |
849 | if (strcmp(bdev->type, "dir") != 0) { | |
850 | if (geteuid() != 0) { | |
851 | ERROR("non-root users can only create directory-backed containers"); | |
852 | exit(1); | |
853 | } | |
cf3ef16d SH |
854 | if (bdev->ops->mount(bdev) < 0) { |
855 | ERROR("Error mounting rootfs"); | |
856 | exit(1); | |
857 | } | |
858 | } else { // TODO come up with a better way here! | |
859 | if (bdev->dest) | |
860 | free(bdev->dest); | |
861 | bdev->dest = strdup(bdev->src); | |
1897e3bc SH |
862 | } |
863 | ||
72d0e1cb SG |
864 | /* |
865 | * create our new array, pre-pend the template name and | |
866 | * base args | |
867 | */ | |
868 | if (argv) | |
1897e3bc SH |
869 | for (nargs = 0; argv[nargs]; nargs++) ; |
870 | nargs += 4; // template, path, rootfs and name args | |
cf3ef16d | 871 | |
72d0e1cb SG |
872 | newargv = malloc(nargs * sizeof(*newargv)); |
873 | if (!newargv) | |
874 | exit(1); | |
96b3cb40 | 875 | newargv[0] = lxcbasename(tpath); |
72d0e1cb | 876 | |
2a59a681 | 877 | len = strlen(c->config_path) + strlen(c->name) + strlen("--path=") + 2; |
72d0e1cb SG |
878 | patharg = malloc(len); |
879 | if (!patharg) | |
880 | exit(1); | |
2a59a681 | 881 | ret = snprintf(patharg, len, "--path=%s/%s", c->config_path, c->name); |
72d0e1cb SG |
882 | if (ret < 0 || ret >= len) |
883 | exit(1); | |
884 | newargv[1] = patharg; | |
885 | len = strlen("--name=") + strlen(c->name) + 1; | |
886 | namearg = malloc(len); | |
887 | if (!namearg) | |
888 | exit(1); | |
889 | ret = snprintf(namearg, len, "--name=%s", c->name); | |
890 | if (ret < 0 || ret >= len) | |
891 | exit(1); | |
892 | newargv[2] = namearg; | |
893 | ||
1897e3bc SH |
894 | len = strlen("--rootfs=") + 1 + strlen(bdev->dest); |
895 | rootfsarg = malloc(len); | |
896 | if (!rootfsarg) | |
897 | exit(1); | |
898 | ret = snprintf(rootfsarg, len, "--rootfs=%s", bdev->dest); | |
899 | if (ret < 0 || ret >= len) | |
900 | exit(1); | |
901 | newargv[3] = rootfsarg; | |
902 | ||
72d0e1cb SG |
903 | /* add passed-in args */ |
904 | if (argv) | |
1897e3bc SH |
905 | for (i = 4; i < nargs; i++) |
906 | newargv[i] = argv[i-4]; | |
72d0e1cb SG |
907 | |
908 | /* add trailing NULL */ | |
909 | nargs++; | |
910 | newargv = realloc(newargv, nargs * sizeof(*newargv)); | |
911 | if (!newargv) | |
912 | exit(1); | |
913 | newargv[nargs - 1] = NULL; | |
914 | ||
cf3ef16d SH |
915 | /* |
916 | * If we're running the template in a mapped userns, then | |
917 | * we prepend the template command with: | |
918 | * lxc-usernsexec <-m map1> ... <-m mapn> -- | |
919 | */ | |
920 | if (geteuid() != 0 && !lxc_list_empty(&conf->id_map)) { | |
921 | int n2args = 1; | |
922 | char **n2 = malloc(n2args * sizeof(*n2)); | |
923 | struct lxc_list *it; | |
924 | struct id_map *map; | |
925 | ||
926 | newargv[0] = tpath; | |
927 | tpath = "lxc-usernsexec"; | |
928 | n2[0] = "lxc-usernsexec"; | |
929 | lxc_list_for_each(it, &conf->id_map) { | |
930 | map = it->elem; | |
931 | n2args += 2; | |
932 | n2 = realloc(n2, n2args * sizeof(*n2)); | |
933 | if (!n2) | |
934 | exit(1); | |
935 | n2[n2args-2] = "-m"; | |
936 | n2[n2args-1] = malloc(200); | |
937 | if (!n2[n2args-1]) | |
938 | exit(1); | |
939 | ret = snprintf(n2[n2args-1], 200, "%c:%lu:%lu:%lu", | |
940 | map->idtype == ID_TYPE_UID ? 'u' : 'g', | |
941 | map->nsid, map->hostid, map->range); | |
942 | if (ret < 0 || ret >= 200) | |
943 | exit(1); | |
944 | } | |
945 | bool hostid_mapped = hostid_is_mapped(geteuid(), conf); | |
946 | int extraargs = hostid_mapped ? 1 : 3; | |
947 | n2 = realloc(n2, (nargs + n2args + extraargs) * sizeof(*n2)); | |
948 | if (!n2) | |
949 | exit(1); | |
950 | if (!hostid_mapped) { | |
951 | int free_id = find_unmapped_nsuid(conf); | |
952 | n2[n2args++] = "-m"; | |
953 | if (free_id < 0) { | |
954 | ERROR("Could not find free uid to map"); | |
955 | exit(1); | |
956 | } | |
957 | n2[n2args++] = malloc(200); | |
958 | if (!n2[n2args-1]) { | |
959 | SYSERROR("out of memory"); | |
960 | exit(1); | |
961 | } | |
962 | ret = snprintf(n2[n2args-1], 200, "u:%d:%d:1", | |
963 | free_id, geteuid()); | |
964 | if (ret < 0 || ret >= 200) { | |
965 | ERROR("string too long"); | |
966 | exit(1); | |
967 | } | |
968 | } | |
969 | n2[n2args++] = "--"; | |
970 | for (i = 0; i < nargs; i++) | |
971 | n2[i + n2args] = newargv[i]; | |
972 | free(newargv); | |
973 | newargv = n2; | |
974 | } | |
72d0e1cb | 975 | /* execute */ |
cf3ef16d | 976 | execvp(tpath, newargv); |
72d0e1cb SG |
977 | SYSERROR("failed to execute template %s", tpath); |
978 | exit(1); | |
979 | } | |
980 | ||
9be53773 SH |
981 | if (wait_for_pid(pid) != 0) { |
982 | ERROR("container creation template for %s failed\n", c->name); | |
96b3cb40 SH |
983 | return false; |
984 | } | |
985 | ||
986 | return true; | |
987 | } | |
988 | ||
3ce74686 SH |
989 | bool prepend_lxc_header(char *path, const char *t, char *const argv[]) |
990 | { | |
1fd9bd50 | 991 | long flen; |
b4569e93 | 992 | char *contents; |
3ce74686 | 993 | FILE *f; |
025ed0f3 | 994 | int ret = -1; |
52026772 | 995 | #if HAVE_LIBGNUTLS |
025ed0f3 | 996 | int i; |
3ce74686 | 997 | unsigned char md_value[SHA_DIGEST_LENGTH]; |
b4569e93 | 998 | char *tpath; |
52026772 | 999 | #endif |
3ce74686 | 1000 | |
025ed0f3 SH |
1001 | process_lock(); |
1002 | f = fopen(path, "r"); | |
1003 | process_unlock(); | |
1004 | if (f == NULL) | |
3ce74686 | 1005 | return false; |
025ed0f3 SH |
1006 | |
1007 | if (fseek(f, 0, SEEK_END) < 0) | |
1008 | goto out_error; | |
1009 | if ((flen = ftell(f)) < 0) | |
1010 | goto out_error; | |
1011 | if (fseek(f, 0, SEEK_SET) < 0) | |
1012 | goto out_error; | |
1013 | if ((contents = malloc(flen + 1)) == NULL) | |
1014 | goto out_error; | |
1015 | if (fread(contents, 1, flen, f) != flen) | |
1016 | goto out_free_contents; | |
1017 | ||
3ce74686 | 1018 | contents[flen] = '\0'; |
025ed0f3 SH |
1019 | process_lock(); |
1020 | ret = fclose(f); | |
1021 | process_unlock(); | |
1022 | f = NULL; | |
1023 | if (ret < 0) | |
1024 | goto out_free_contents; | |
3ce74686 | 1025 | |
b4569e93 | 1026 | #if HAVE_LIBGNUTLS |
01efd4d3 | 1027 | tpath = get_template_path(t); |
85db5535 | 1028 | if (!tpath) { |
3ce74686 | 1029 | ERROR("bad template: %s\n", t); |
025ed0f3 | 1030 | goto out_free_contents; |
3ce74686 SH |
1031 | } |
1032 | ||
85db5535 DE |
1033 | ret = sha1sum_file(tpath, md_value); |
1034 | if (ret < 0) { | |
1035 | ERROR("Error getting sha1sum of %s", tpath); | |
3ce74686 | 1036 | free(tpath); |
85db5535 | 1037 | goto out_free_contents; |
3ce74686 | 1038 | } |
85db5535 | 1039 | free(tpath); |
3ce74686 SH |
1040 | #endif |
1041 | ||
025ed0f3 SH |
1042 | process_lock(); |
1043 | f = fopen(path, "w"); | |
1044 | process_unlock(); | |
1045 | if (f == NULL) { | |
3ce74686 SH |
1046 | SYSERROR("reopening config for writing"); |
1047 | free(contents); | |
1048 | return false; | |
1049 | } | |
1050 | fprintf(f, "# Template used to create this container: %s\n", t); | |
1051 | if (argv) { | |
1052 | fprintf(f, "# Parameters passed to the template:"); | |
1053 | while (*argv) { | |
1054 | fprintf(f, " %s", *argv); | |
1055 | argv++; | |
1056 | } | |
1057 | fprintf(f, "\n"); | |
1058 | } | |
1059 | #if HAVE_LIBGNUTLS | |
56698177 SH |
1060 | fprintf(f, "# Template script checksum (SHA-1): "); |
1061 | for (i=0; i<SHA_DIGEST_LENGTH; i++) | |
1062 | fprintf(f, "%02x", md_value[i]); | |
1063 | fprintf(f, "\n"); | |
3ce74686 SH |
1064 | #endif |
1065 | if (fwrite(contents, 1, flen, f) != flen) { | |
1066 | SYSERROR("Writing original contents"); | |
1067 | free(contents); | |
025ed0f3 | 1068 | process_lock(); |
3ce74686 | 1069 | fclose(f); |
025ed0f3 | 1070 | process_unlock(); |
3ce74686 SH |
1071 | return false; |
1072 | } | |
025ed0f3 SH |
1073 | ret = 0; |
1074 | out_free_contents: | |
3ce74686 | 1075 | free(contents); |
025ed0f3 SH |
1076 | out_error: |
1077 | if (f) { | |
1078 | int newret; | |
1079 | process_lock(); | |
1080 | newret = fclose(f); | |
1081 | process_unlock(); | |
1082 | if (ret == 0) | |
1083 | ret = newret; | |
1084 | } | |
1085 | if (ret < 0) { | |
1086 | SYSERROR("Error prepending header"); | |
3ce74686 SH |
1087 | return false; |
1088 | } | |
1089 | return true; | |
1090 | } | |
1091 | ||
96b3cb40 SH |
1092 | static bool lxcapi_destroy(struct lxc_container *c); |
1093 | /* | |
1094 | * lxcapi_create: | |
1095 | * create a container with the given parameters. | |
1096 | * @c: container to be created. It has the lxcpath, name, and a starting | |
1097 | * configuration already set | |
1098 | * @t: the template to execute to instantiate the root filesystem and | |
1099 | * adjust the configuration. | |
1100 | * @bdevtype: backing store type to use. If NULL, dir will be used. | |
1101 | * @specs: additional parameters for the backing store, i.e. LVM vg to | |
1102 | * use. | |
1103 | * | |
1104 | * @argv: the arguments to pass to the template, terminated by NULL. If no | |
1105 | * arguments, you can just pass NULL. | |
1106 | */ | |
1107 | static bool lxcapi_create(struct lxc_container *c, const char *t, | |
dc23c1c8 | 1108 | const char *bdevtype, struct bdev_specs *specs, int flags, |
96b3cb40 SH |
1109 | char *const argv[]) |
1110 | { | |
a69aad27 | 1111 | bool ret = false; |
96b3cb40 | 1112 | pid_t pid; |
85db5535 | 1113 | char *tpath = NULL; |
cbee8106 | 1114 | int partial_fd; |
96b3cb40 SH |
1115 | |
1116 | if (!c) | |
1117 | return false; | |
1118 | ||
85db5535 DE |
1119 | if (t) { |
1120 | tpath = get_template_path(t); | |
1121 | if (!tpath) { | |
1122 | ERROR("bad template: %s\n", t); | |
1123 | goto out; | |
1124 | } | |
96b3cb40 SH |
1125 | } |
1126 | ||
cf465fe4 SH |
1127 | /* |
1128 | * If a template is passed in, and the rootfs already is defined in | |
1129 | * the container config and exists, then * caller is trying to create | |
1130 | * an existing container. Return an error, but do NOT delete the | |
1131 | * container. | |
1132 | */ | |
1133 | if (lxcapi_is_defined(c) && c->lxc_conf && c->lxc_conf->rootfs.path && | |
1134 | access(c->lxc_conf->rootfs.path, F_OK) == 0 && tpath) { | |
1135 | ERROR("Container %s:%s already exists", c->config_path, c->name); | |
1136 | free(tpath); | |
1137 | return false; | |
1138 | } | |
1139 | ||
1140 | /* Save the loaded configuration to disk */ | |
96b3cb40 SH |
1141 | if (!c->save_config(c, NULL)) { |
1142 | ERROR("failed to save starting configuration for %s\n", c->name); | |
1143 | goto out; | |
1144 | } | |
1145 | ||
0590e82c SH |
1146 | /* |
1147 | * either template or rootfs.path should be set. | |
1148 | * if both template and rootfs.path are set, template is setup as rootfs.path. | |
1149 | * container is already created if we have a config and rootfs.path is accessible | |
1150 | */ | |
1151 | if (!c->lxc_conf->rootfs.path && !tpath) | |
1152 | /* no template passed in and rootfs does not exist: error */ | |
1153 | goto out; | |
1154 | if (c->lxc_conf->rootfs.path && access(c->lxc_conf->rootfs.path, F_OK) != 0) | |
1155 | /* rootfs passed into configuration, but does not exist: error */ | |
1156 | goto out; | |
1157 | if (lxcapi_is_defined(c) && c->lxc_conf->rootfs.path && !tpath) { | |
1158 | /* Rootfs already existed, user just wanted to save the | |
1159 | * loaded configuration */ | |
1160 | ret = true; | |
1161 | goto out; | |
a69aad27 | 1162 | } |
96b3cb40 SH |
1163 | |
1164 | /* Mark that this container is being created */ | |
1165 | if ((partial_fd = create_partial(c)) < 0) | |
1166 | goto out; | |
1167 | ||
1168 | /* no need to get disk lock bc we have the partial locked */ | |
1169 | ||
1170 | /* | |
1171 | * Create the backing store | |
1172 | * Note we can't do this in the same task as we use to execute the | |
1173 | * template because of the way zfs works. | |
1174 | * After you 'zfs create', zfs mounts the fs only in the initial | |
1175 | * namespace. | |
1176 | */ | |
1177 | pid = fork(); | |
1178 | if (pid < 0) { | |
1179 | SYSERROR("failed to fork task for container creation template\n"); | |
8eb5694b SH |
1180 | goto out_unlock; |
1181 | } | |
1182 | ||
96b3cb40 SH |
1183 | if (pid == 0) { // child |
1184 | struct bdev *bdev = NULL; | |
1185 | ||
025ed0f3 | 1186 | process_unlock(); // we're no longer sharing |
96b3cb40 SH |
1187 | if (!(bdev = do_bdev_create(c, bdevtype, specs))) { |
1188 | ERROR("Error creating backing store type %s for %s", | |
1189 | bdevtype ? bdevtype : "(none)", c->name); | |
1190 | exit(1); | |
1191 | } | |
1192 | ||
1193 | /* save config file again to store the new rootfs location */ | |
1194 | if (!c->save_config(c, NULL)) { | |
1195 | ERROR("failed to save starting configuration for %s\n", c->name); | |
1196 | // parent task won't see bdev in config so we delete it | |
1197 | bdev->ops->umount(bdev); | |
1198 | bdev->ops->destroy(bdev); | |
1199 | exit(1); | |
1200 | } | |
1201 | exit(0); | |
1202 | } | |
1203 | if (wait_for_pid(pid) != 0) | |
a09295f8 | 1204 | goto out_unlock; |
96b3cb40 SH |
1205 | |
1206 | /* reload config to get the rootfs */ | |
1207 | if (c->lxc_conf) | |
1208 | lxc_conf_free(c->lxc_conf); | |
1209 | c->lxc_conf = NULL; | |
1210 | if (!load_config_locked(c, c->configfile)) | |
a09295f8 | 1211 | goto out_unlock; |
96b3cb40 | 1212 | |
dc23c1c8 | 1213 | if (!create_run_template(c, tpath, !!(flags & LXC_CREATE_QUIET), argv)) |
96b3cb40 SH |
1214 | goto out_unlock; |
1215 | ||
8eb5694b SH |
1216 | // now clear out the lxc_conf we have, reload from the created |
1217 | // container | |
1218 | if (c->lxc_conf) | |
1219 | lxc_conf_free(c->lxc_conf); | |
1220 | c->lxc_conf = NULL; | |
3ce74686 | 1221 | |
9d65a487 KY |
1222 | if (t) { |
1223 | if (!prepend_lxc_header(c->configfile, tpath, argv)) { | |
1224 | ERROR("Error prepending header to configuration file"); | |
1225 | goto out_unlock; | |
1226 | } | |
3ce74686 | 1227 | } |
a69aad27 | 1228 | ret = load_config_locked(c, c->configfile); |
72d0e1cb SG |
1229 | |
1230 | out_unlock: | |
3e625e2d SH |
1231 | if (partial_fd >= 0) |
1232 | remove_partial(c, partial_fd); | |
72d0e1cb SG |
1233 | out: |
1234 | if (tpath) | |
1235 | free(tpath); | |
a69aad27 | 1236 | if (!ret && c) |
1897e3bc | 1237 | lxcapi_destroy(c); |
a69aad27 | 1238 | return ret; |
72d0e1cb SG |
1239 | } |
1240 | ||
3e625e2d SH |
1241 | static bool lxcapi_reboot(struct lxc_container *c) |
1242 | { | |
1243 | pid_t pid; | |
1244 | ||
1245 | if (!c) | |
1246 | return false; | |
1247 | if (!c->is_running(c)) | |
1248 | return false; | |
1249 | pid = c->init_pid(c); | |
1250 | if (pid <= 0) | |
1251 | return false; | |
1252 | if (kill(pid, SIGINT) < 0) | |
1253 | return false; | |
1254 | return true; | |
1255 | ||
1256 | } | |
1257 | ||
72d0e1cb SG |
1258 | static bool lxcapi_shutdown(struct lxc_container *c, int timeout) |
1259 | { | |
1260 | bool retv; | |
1261 | pid_t pid; | |
1262 | ||
1263 | if (!c) | |
1264 | return false; | |
1265 | ||
1266 | if (!timeout) | |
1267 | timeout = -1; | |
1268 | if (!c->is_running(c)) | |
1269 | return true; | |
1270 | pid = c->init_pid(c); | |
1271 | if (pid <= 0) | |
1272 | return true; | |
1273 | kill(pid, SIGPWR); | |
1274 | retv = c->wait(c, "STOPPED", timeout); | |
f6144ed4 | 1275 | if (!retv && timeout > 0) { |
72d0e1cb SG |
1276 | c->stop(c); |
1277 | retv = c->wait(c, "STOPPED", 0); // 0 means don't wait | |
1278 | } | |
1279 | return retv; | |
1280 | } | |
1281 | ||
1897e3bc | 1282 | static bool lxcapi_createl(struct lxc_container *c, const char *t, |
dc23c1c8 | 1283 | const char *bdevtype, struct bdev_specs *specs, int flags, ...) |
72d0e1cb SG |
1284 | { |
1285 | bool bret = false; | |
a0e93eeb | 1286 | char **args = NULL; |
72d0e1cb | 1287 | va_list ap; |
72d0e1cb SG |
1288 | |
1289 | if (!c) | |
1290 | return false; | |
1291 | ||
1292 | /* | |
1293 | * since we're going to wait for create to finish, I don't think we | |
1294 | * need to get a copy of the arguments. | |
1295 | */ | |
dc23c1c8 | 1296 | va_start(ap, flags); |
a0e93eeb | 1297 | args = lxc_va_arg_list_to_argv(ap, 0, 0); |
72d0e1cb | 1298 | va_end(ap); |
a0e93eeb CS |
1299 | if (!args) { |
1300 | ERROR("Memory allocation error."); | |
1301 | goto out; | |
1302 | } | |
72d0e1cb | 1303 | |
dc23c1c8 | 1304 | bret = c->create(c, t, bdevtype, specs, flags, args); |
72d0e1cb SG |
1305 | |
1306 | out: | |
a0e93eeb | 1307 | free(args); |
72d0e1cb SG |
1308 | return bret; |
1309 | } | |
1310 | ||
12a50cc6 | 1311 | static bool lxcapi_clear_config_item(struct lxc_container *c, const char *key) |
72d0e1cb SG |
1312 | { |
1313 | int ret; | |
1314 | ||
1315 | if (!c || !c->lxc_conf) | |
1316 | return false; | |
5cee8c50 | 1317 | if (container_mem_lock(c)) |
72d0e1cb | 1318 | return false; |
72d0e1cb | 1319 | ret = lxc_clear_config_item(c->lxc_conf, key); |
5cee8c50 | 1320 | container_mem_unlock(c); |
72d0e1cb SG |
1321 | return ret == 0; |
1322 | } | |
1323 | ||
799f29ab ÇO |
1324 | static inline void exit_from_ns(struct lxc_container *c, int *old_netns, int *new_netns) { |
1325 | /* Switch back to original netns */ | |
1326 | if (*old_netns >= 0 && setns(*old_netns, CLONE_NEWNET)) | |
1327 | SYSERROR("failed to setns"); | |
1328 | process_lock(); | |
1329 | if (*new_netns >= 0) | |
1330 | close(*new_netns); | |
1331 | if (*old_netns >= 0) | |
1332 | close(*old_netns); | |
1333 | process_unlock(); | |
1334 | } | |
1335 | ||
1336 | static inline bool enter_to_ns(struct lxc_container *c, int *old_netns, int *new_netns) { | |
1337 | int ret = 0; | |
9c83a661 | 1338 | char new_netns_path[MAXPATHLEN]; |
9c83a661 SG |
1339 | |
1340 | if (!c->is_running(c)) | |
1341 | goto out; | |
1342 | ||
1343 | /* Save reference to old netns */ | |
025ed0f3 | 1344 | process_lock(); |
799f29ab | 1345 | *old_netns = open("/proc/self/ns/net", O_RDONLY); |
025ed0f3 | 1346 | process_unlock(); |
799f29ab | 1347 | if (*old_netns < 0) { |
9c83a661 SG |
1348 | SYSERROR("failed to open /proc/self/ns/net"); |
1349 | goto out; | |
1350 | } | |
1351 | ||
1352 | /* Switch to new netns */ | |
1353 | ret = snprintf(new_netns_path, MAXPATHLEN, "/proc/%d/ns/net", c->init_pid(c)); | |
1354 | if (ret < 0 || ret >= MAXPATHLEN) | |
1355 | goto out; | |
1356 | ||
025ed0f3 | 1357 | process_lock(); |
799f29ab | 1358 | *new_netns = open(new_netns_path, O_RDONLY); |
025ed0f3 | 1359 | process_unlock(); |
799f29ab | 1360 | if (*new_netns < 0) { |
9c83a661 SG |
1361 | SYSERROR("failed to open %s", new_netns_path); |
1362 | goto out; | |
1363 | } | |
1364 | ||
799f29ab | 1365 | if (setns(*new_netns, CLONE_NEWNET)) { |
9c83a661 SG |
1366 | SYSERROR("failed to setns"); |
1367 | goto out; | |
1368 | } | |
799f29ab ÇO |
1369 | return true; |
1370 | out: | |
1371 | exit_from_ns(c, old_netns, new_netns); | |
1372 | return false; | |
1373 | } | |
1374 | ||
9c88ff1f ÇO |
1375 | // used by qsort and bsearch functions for comparing names |
1376 | static inline int string_cmp(char **first, char **second) | |
1377 | { | |
1378 | return strcmp(*first, *second); | |
1379 | } | |
1380 | ||
1381 | // used by qsort and bsearch functions for comparing container names | |
1382 | static inline int container_cmp(struct lxc_container **first, struct lxc_container **second) | |
1383 | { | |
1384 | return strcmp((*first)->name, (*second)->name); | |
1385 | } | |
1386 | ||
1387 | static bool add_to_array(char ***names, char *cname, int pos) | |
1388 | { | |
1389 | char **newnames = realloc(*names, (pos+1) * sizeof(char *)); | |
1390 | if (!newnames) { | |
1391 | ERROR("Out of memory"); | |
1392 | return false; | |
1393 | } | |
1394 | ||
1395 | *names = newnames; | |
1396 | newnames[pos] = strdup(cname); | |
1397 | if (!newnames[pos]) | |
1398 | return false; | |
1399 | ||
1400 | // sort the arrray as we will use binary search on it | |
1401 | qsort(newnames, pos + 1, sizeof(char *), (int (*)(const void *,const void *))string_cmp); | |
1402 | ||
1403 | return true; | |
1404 | } | |
1405 | ||
2871830a | 1406 | static bool add_to_clist(struct lxc_container ***list, struct lxc_container *c, int pos, bool sort) |
9c88ff1f ÇO |
1407 | { |
1408 | struct lxc_container **newlist = realloc(*list, (pos+1) * sizeof(struct lxc_container *)); | |
1409 | if (!newlist) { | |
1410 | ERROR("Out of memory"); | |
1411 | return false; | |
1412 | } | |
1413 | ||
1414 | *list = newlist; | |
1415 | newlist[pos] = c; | |
1416 | ||
1417 | // sort the arrray as we will use binary search on it | |
2871830a DE |
1418 | if (sort) |
1419 | qsort(newlist, pos + 1, sizeof(struct lxc_container *), (int (*)(const void *,const void *))container_cmp); | |
9c88ff1f ÇO |
1420 | |
1421 | return true; | |
1422 | } | |
1423 | ||
1424 | static char** get_from_array(char ***names, char *cname, int size) | |
1425 | { | |
1426 | return (char **)bsearch(&cname, *names, size, sizeof(char *), (int (*)(const void *, const void *))string_cmp); | |
1427 | } | |
1428 | ||
1429 | ||
1430 | static bool array_contains(char ***names, char *cname, int size) { | |
1431 | if(get_from_array(names, cname, size) != NULL) | |
1432 | return true; | |
1433 | return false; | |
1434 | } | |
1435 | ||
1436 | static bool remove_from_array(char ***names, char *cname, int size) | |
1437 | { | |
1438 | char **result = get_from_array(names, cname, size); | |
1439 | if (result != NULL) { | |
1440 | free(result); | |
1441 | return true; | |
1442 | } | |
1443 | return false; | |
1444 | } | |
1445 | ||
799f29ab ÇO |
1446 | static char** lxcapi_get_interfaces(struct lxc_container *c) |
1447 | { | |
9c88ff1f | 1448 | int i, count = 0; |
799f29ab | 1449 | struct ifaddrs *interfaceArray = NULL, *tempIfAddr = NULL; |
9c88ff1f | 1450 | char **interfaces = NULL; |
799f29ab ÇO |
1451 | int old_netns = -1, new_netns = -1; |
1452 | ||
1453 | if (!enter_to_ns(c, &old_netns, &new_netns)) | |
1454 | goto out; | |
1455 | ||
1456 | /* Grab the list of interfaces */ | |
1457 | if (getifaddrs(&interfaceArray)) { | |
1458 | SYSERROR("failed to get interfaces list"); | |
1459 | goto out; | |
1460 | } | |
1461 | ||
1462 | /* Iterate through the interfaces */ | |
1463 | for (tempIfAddr = interfaceArray; tempIfAddr != NULL; tempIfAddr = tempIfAddr->ifa_next) { | |
9c88ff1f ÇO |
1464 | if (array_contains(&interfaces, tempIfAddr->ifa_name, count)) |
1465 | continue; | |
799f29ab | 1466 | |
9c88ff1f ÇO |
1467 | if(!add_to_array(&interfaces, tempIfAddr->ifa_name, count)) |
1468 | goto err; | |
1469 | count++; | |
1470 | } | |
799f29ab ÇO |
1471 | |
1472 | out: | |
9c88ff1f ÇO |
1473 | if (interfaceArray) |
1474 | freeifaddrs(interfaceArray); | |
1475 | ||
1476 | exit_from_ns(c, &old_netns, &new_netns); | |
799f29ab | 1477 | |
9c88ff1f ÇO |
1478 | /* Append NULL to the array */ |
1479 | if(interfaces) | |
1480 | interfaces = (char **)lxc_append_null_to_array((void **)interfaces, count); | |
799f29ab | 1481 | |
9c88ff1f | 1482 | return interfaces; |
799f29ab | 1483 | |
9c88ff1f ÇO |
1484 | err: |
1485 | for(i=0;i<count;i++) | |
1486 | free(interfaces[i]); | |
1487 | free(interfaces); | |
1488 | interfaces = NULL; | |
1489 | goto out; | |
799f29ab ÇO |
1490 | } |
1491 | ||
1492 | static char** lxcapi_get_ips(struct lxc_container *c, char* interface, char* family, int scope) | |
1493 | { | |
9c88ff1f | 1494 | int i, count = 0; |
799f29ab ÇO |
1495 | struct ifaddrs *interfaceArray = NULL, *tempIfAddr = NULL; |
1496 | char addressOutputBuffer[INET6_ADDRSTRLEN]; | |
1497 | void *tempAddrPtr = NULL; | |
9c88ff1f | 1498 | char **addresses = NULL; |
799f29ab ÇO |
1499 | char *address = NULL; |
1500 | int old_netns = -1, new_netns = -1; | |
1501 | ||
1502 | if (!enter_to_ns(c, &old_netns, &new_netns)) | |
1503 | goto out; | |
9c83a661 SG |
1504 | |
1505 | /* Grab the list of interfaces */ | |
1506 | if (getifaddrs(&interfaceArray)) { | |
1507 | SYSERROR("failed to get interfaces list"); | |
1508 | goto out; | |
1509 | } | |
1510 | ||
1511 | /* Iterate through the interfaces */ | |
1512 | for (tempIfAddr = interfaceArray; tempIfAddr != NULL; tempIfAddr = tempIfAddr->ifa_next) { | |
fe218ca3 SG |
1513 | if (tempIfAddr->ifa_addr == NULL) |
1514 | continue; | |
1515 | ||
9c83a661 SG |
1516 | if(tempIfAddr->ifa_addr->sa_family == AF_INET) { |
1517 | if (family && strcmp(family, "inet")) | |
1518 | continue; | |
1519 | tempAddrPtr = &((struct sockaddr_in *)tempIfAddr->ifa_addr)->sin_addr; | |
1520 | } | |
1521 | else { | |
1522 | if (family && strcmp(family, "inet6")) | |
1523 | continue; | |
1524 | ||
1525 | if (((struct sockaddr_in6 *)tempIfAddr->ifa_addr)->sin6_scope_id != scope) | |
1526 | continue; | |
1527 | ||
1528 | tempAddrPtr = &((struct sockaddr_in6 *)tempIfAddr->ifa_addr)->sin6_addr; | |
1529 | } | |
1530 | ||
1531 | if (interface && strcmp(interface, tempIfAddr->ifa_name)) | |
1532 | continue; | |
1533 | else if (!interface && strcmp("lo", tempIfAddr->ifa_name) == 0) | |
1534 | continue; | |
1535 | ||
1536 | address = (char *)inet_ntop(tempIfAddr->ifa_addr->sa_family, | |
1537 | tempAddrPtr, | |
1538 | addressOutputBuffer, | |
1539 | sizeof(addressOutputBuffer)); | |
1540 | if (!address) | |
1541 | continue; | |
1542 | ||
9c88ff1f ÇO |
1543 | if(!add_to_array(&addresses, address, count)) |
1544 | goto err; | |
1545 | count++; | |
9c83a661 SG |
1546 | } |
1547 | ||
1548 | out: | |
1549 | if(interfaceArray) | |
1550 | freeifaddrs(interfaceArray); | |
1551 | ||
799f29ab | 1552 | exit_from_ns(c, &old_netns, &new_netns); |
9c83a661 SG |
1553 | |
1554 | /* Append NULL to the array */ | |
9c88ff1f ÇO |
1555 | if(addresses) |
1556 | addresses = (char **)lxc_append_null_to_array((void **)addresses, count); | |
9c83a661 SG |
1557 | |
1558 | return addresses; | |
9c88ff1f ÇO |
1559 | |
1560 | err: | |
1561 | for(i=0;i<count;i++) | |
1562 | free(addresses[i]); | |
1563 | free(addresses); | |
1564 | addresses = NULL; | |
1565 | ||
1566 | goto out; | |
9c83a661 SG |
1567 | } |
1568 | ||
12a50cc6 | 1569 | static int lxcapi_get_config_item(struct lxc_container *c, const char *key, char *retv, int inlen) |
72d0e1cb SG |
1570 | { |
1571 | int ret; | |
1572 | ||
1573 | if (!c || !c->lxc_conf) | |
1574 | return -1; | |
5cee8c50 | 1575 | if (container_mem_lock(c)) |
72d0e1cb | 1576 | return -1; |
72d0e1cb | 1577 | ret = lxc_get_config_item(c->lxc_conf, key, retv, inlen); |
5cee8c50 | 1578 | container_mem_unlock(c); |
72d0e1cb SG |
1579 | return ret; |
1580 | } | |
1581 | ||
12a50cc6 | 1582 | static int lxcapi_get_keys(struct lxc_container *c, const char *key, char *retv, int inlen) |
72d0e1cb SG |
1583 | { |
1584 | if (!key) | |
1585 | return lxc_listconfigs(retv, inlen); | |
1586 | /* | |
1587 | * Support 'lxc.network.<idx>', i.e. 'lxc.network.0' | |
1588 | * This is an intelligent result to show which keys are valid given | |
1589 | * the type of nic it is | |
1590 | */ | |
1591 | if (!c || !c->lxc_conf) | |
1592 | return -1; | |
5cee8c50 | 1593 | if (container_mem_lock(c)) |
72d0e1cb SG |
1594 | return -1; |
1595 | int ret = -1; | |
1596 | if (strncmp(key, "lxc.network.", 12) == 0) | |
1597 | ret = lxc_list_nicconfigs(c->lxc_conf, key, retv, inlen); | |
5cee8c50 | 1598 | container_mem_unlock(c); |
72d0e1cb SG |
1599 | return ret; |
1600 | } | |
1601 | ||
12a50cc6 | 1602 | static bool lxcapi_save_config(struct lxc_container *c, const char *alt_file) |
72d0e1cb | 1603 | { |
39dc698c SH |
1604 | FILE *fout; |
1605 | bool ret = false, need_disklock = false; | |
1606 | int lret; | |
1607 | ||
72d0e1cb SG |
1608 | if (!alt_file) |
1609 | alt_file = c->configfile; | |
1610 | if (!alt_file) | |
1611 | return false; // should we write to stdout if no file is specified? | |
39dc698c SH |
1612 | |
1613 | // If we haven't yet loaded a config, load the stock config | |
1614 | if (!c->lxc_conf) { | |
72d0e1cb SG |
1615 | if (!c->load_config(c, LXC_DEFAULT_CONFIG)) { |
1616 | ERROR("Error loading default configuration file %s while saving %s\n", LXC_DEFAULT_CONFIG, c->name); | |
1617 | return false; | |
1618 | } | |
39dc698c | 1619 | } |
72d0e1cb | 1620 | |
5a3d2e1e SG |
1621 | if (!create_container_dir(c)) |
1622 | return false; | |
1623 | ||
39dc698c SH |
1624 | /* |
1625 | * If we're writing to the container's config file, take the | |
1626 | * disk lock. Otherwise just take the memlock to protect the | |
1627 | * struct lxc_container while we're traversing it. | |
1628 | */ | |
1629 | if (strcmp(c->configfile, alt_file) == 0) | |
1630 | need_disklock = true; | |
1631 | ||
1632 | if (need_disklock) | |
1633 | lret = container_disk_lock(c); | |
1634 | else | |
1635 | lret = container_mem_lock(c); | |
1636 | ||
1637 | if (lret) | |
72d0e1cb | 1638 | return false; |
39dc698c SH |
1639 | |
1640 | fout = fopen(alt_file, "w"); | |
1641 | if (!fout) | |
1642 | goto out; | |
72d0e1cb SG |
1643 | write_config(fout, c->lxc_conf); |
1644 | fclose(fout); | |
39dc698c SH |
1645 | ret = true; |
1646 | ||
1647 | out: | |
1648 | if (need_disklock) | |
1649 | container_disk_unlock(c); | |
1650 | else | |
1651 | container_mem_unlock(c); | |
1652 | return ret; | |
72d0e1cb SG |
1653 | } |
1654 | ||
dfb31b25 SH |
1655 | static bool mod_rdep(struct lxc_container *c, bool inc) |
1656 | { | |
1657 | char path[MAXPATHLEN]; | |
1658 | int ret, v = 0; | |
1659 | FILE *f; | |
1660 | bool bret = false; | |
1661 | ||
1662 | if (container_disk_lock(c)) | |
1663 | return false; | |
1664 | ret = snprintf(path, MAXPATHLEN, "%s/%s/lxc_snapshots", c->config_path, | |
1665 | c->name); | |
1666 | if (ret < 0 || ret > MAXPATHLEN) | |
1667 | goto out; | |
025ed0f3 | 1668 | process_lock(); |
dfb31b25 | 1669 | f = fopen(path, "r"); |
025ed0f3 | 1670 | process_unlock(); |
dfb31b25 SH |
1671 | if (f) { |
1672 | ret = fscanf(f, "%d", &v); | |
025ed0f3 | 1673 | process_lock(); |
dfb31b25 | 1674 | fclose(f); |
025ed0f3 | 1675 | process_unlock(); |
dfb31b25 SH |
1676 | if (ret != 1) { |
1677 | ERROR("Corrupted file %s", path); | |
1678 | goto out; | |
1679 | } | |
1680 | } | |
1681 | v += inc ? 1 : -1; | |
025ed0f3 | 1682 | process_lock(); |
dfb31b25 | 1683 | f = fopen(path, "w"); |
025ed0f3 | 1684 | process_unlock(); |
dfb31b25 SH |
1685 | if (!f) |
1686 | goto out; | |
1687 | if (fprintf(f, "%d\n", v) < 0) { | |
1688 | ERROR("Error writing new snapshots value"); | |
025ed0f3 | 1689 | process_lock(); |
dfb31b25 | 1690 | fclose(f); |
025ed0f3 | 1691 | process_unlock(); |
dfb31b25 SH |
1692 | goto out; |
1693 | } | |
025ed0f3 SH |
1694 | process_lock(); |
1695 | ret = fclose(f); | |
1696 | process_unlock(); | |
1697 | if (ret != 0) { | |
dfb31b25 SH |
1698 | SYSERROR("Error writing to or closing snapshots file"); |
1699 | goto out; | |
1700 | } | |
1701 | ||
1702 | bret = true; | |
1703 | ||
1704 | out: | |
1705 | container_disk_unlock(c); | |
1706 | return bret; | |
1707 | } | |
1708 | ||
1709 | static void strip_newline(char *p) | |
1710 | { | |
1711 | size_t len = strlen(p); | |
1712 | if (len < 1) | |
1713 | return; | |
1714 | if (p[len-1] == '\n') | |
1715 | p[len-1] = '\0'; | |
1716 | } | |
1717 | ||
1718 | static void mod_all_rdeps(struct lxc_container *c, bool inc) | |
1719 | { | |
1720 | struct lxc_container *p; | |
1721 | char *lxcpath = NULL, *lxcname = NULL, path[MAXPATHLEN]; | |
1722 | size_t pathlen = 0, namelen = 0; | |
1723 | FILE *f; | |
1724 | int ret; | |
1725 | ||
1726 | ret = snprintf(path, MAXPATHLEN, "%s/%s/lxc_rdepends", | |
1727 | c->config_path, c->name); | |
1728 | if (ret < 0 || ret >= MAXPATHLEN) { | |
1729 | ERROR("Path name too long"); | |
1730 | return; | |
1731 | } | |
025ed0f3 SH |
1732 | process_lock(); |
1733 | f = fopen(path, "r"); | |
1734 | process_unlock(); | |
1735 | if (f == NULL) | |
dfb31b25 SH |
1736 | return; |
1737 | while (getline(&lxcpath, &pathlen, f) != -1) { | |
1738 | if (getline(&lxcname, &namelen, f) == -1) { | |
1739 | ERROR("badly formatted file %s\n", path); | |
1740 | goto out; | |
1741 | } | |
1742 | strip_newline(lxcpath); | |
1743 | strip_newline(lxcname); | |
1744 | if ((p = lxc_container_new(lxcname, lxcpath)) == NULL) { | |
1745 | ERROR("Unable to find dependent container %s:%s", | |
1746 | lxcpath, lxcname); | |
1747 | continue; | |
1748 | } | |
1749 | if (!mod_rdep(p, inc)) | |
1750 | ERROR("Failed to increase numsnapshots for %s:%s", | |
1751 | lxcpath, lxcname); | |
1752 | lxc_container_put(p); | |
1753 | } | |
1754 | out: | |
1755 | if (lxcpath) free(lxcpath); | |
1756 | if (lxcname) free(lxcname); | |
025ed0f3 | 1757 | process_lock(); |
dfb31b25 | 1758 | fclose(f); |
025ed0f3 | 1759 | process_unlock(); |
dfb31b25 SH |
1760 | } |
1761 | ||
1762 | static bool has_snapshots(struct lxc_container *c) | |
1763 | { | |
1764 | char path[MAXPATHLEN]; | |
1765 | int ret, v; | |
1766 | FILE *f; | |
1767 | bool bret = false; | |
1768 | ||
1769 | ret = snprintf(path, MAXPATHLEN, "%s/%s/lxc_snapshots", c->config_path, | |
1770 | c->name); | |
1771 | if (ret < 0 || ret > MAXPATHLEN) | |
1772 | goto out; | |
025ed0f3 | 1773 | process_lock(); |
dfb31b25 | 1774 | f = fopen(path, "r"); |
025ed0f3 | 1775 | process_unlock(); |
dfb31b25 SH |
1776 | if (!f) |
1777 | goto out; | |
1778 | ret = fscanf(f, "%d", &v); | |
025ed0f3 | 1779 | process_lock(); |
dfb31b25 | 1780 | fclose(f); |
025ed0f3 | 1781 | process_unlock(); |
dfb31b25 SH |
1782 | if (ret != 1) |
1783 | goto out; | |
1784 | bret = v != 0; | |
1785 | ||
1786 | out: | |
1787 | return bret; | |
1788 | } | |
1789 | ||
60bf62d4 | 1790 | // do we want the api to support --force, or leave that to the caller? |
72d0e1cb SG |
1791 | static bool lxcapi_destroy(struct lxc_container *c) |
1792 | { | |
1897e3bc | 1793 | struct bdev *r = NULL; |
60bf62d4 | 1794 | bool ret = false; |
72d0e1cb | 1795 | |
1897e3bc | 1796 | if (!c || !lxcapi_is_defined(c)) |
5a3d2e1e SG |
1797 | return false; |
1798 | ||
3bc449ed | 1799 | if (container_disk_lock(c)) |
72d0e1cb | 1800 | return false; |
72d0e1cb | 1801 | |
39dc698c | 1802 | if (!is_stopped(c)) { |
60bf62d4 SH |
1803 | // we should queue some sort of error - in c->error_string? |
1804 | ERROR("container %s is not stopped", c->name); | |
1805 | goto out; | |
72d0e1cb SG |
1806 | } |
1807 | ||
dfb31b25 | 1808 | if (c->lxc_conf && has_snapshots(c)) { |
2a2d36a4 | 1809 | ERROR("container %s has dependent snapshots", c->name); |
dfb31b25 SH |
1810 | goto out; |
1811 | } | |
1812 | ||
3bc449ed | 1813 | if (c->lxc_conf && c->lxc_conf->rootfs.path && c->lxc_conf->rootfs.mount) |
1897e3bc | 1814 | r = bdev_init(c->lxc_conf->rootfs.path, c->lxc_conf->rootfs.mount, NULL); |
60bf62d4 SH |
1815 | if (r) { |
1816 | if (r->ops->destroy(r) < 0) { | |
59d66af2 | 1817 | bdev_put(r); |
60bf62d4 SH |
1818 | ERROR("Error destroying rootfs for %s", c->name); |
1819 | goto out; | |
1820 | } | |
59d66af2 | 1821 | bdev_put(r); |
60bf62d4 SH |
1822 | } |
1823 | ||
dfb31b25 SH |
1824 | mod_all_rdeps(c, false); |
1825 | ||
60bf62d4 SH |
1826 | const char *p1 = lxcapi_get_config_path(c); |
1827 | char *path = alloca(strlen(p1) + strlen(c->name) + 2); | |
1828 | sprintf(path, "%s/%s", p1, c->name); | |
1829 | if (lxc_rmdir_onedev(path) < 0) { | |
1830 | ERROR("Error destroying container directory for %s", c->name); | |
1831 | goto out; | |
1832 | } | |
1833 | ret = true; | |
1834 | ||
1835 | out: | |
3bc449ed | 1836 | container_disk_unlock(c); |
60bf62d4 | 1837 | return ret; |
72d0e1cb SG |
1838 | } |
1839 | ||
96532523 SH |
1840 | static bool set_config_item_locked(struct lxc_container *c, const char *key, const char *v) |
1841 | { | |
1842 | struct lxc_config_t *config; | |
1843 | ||
1844 | if (!c->lxc_conf) | |
1845 | c->lxc_conf = lxc_conf_init(); | |
1846 | if (!c->lxc_conf) | |
1847 | return false; | |
1848 | config = lxc_getconfig(key); | |
1849 | if (!config) | |
1850 | return false; | |
1851 | return (0 == config->cb(key, v, c->lxc_conf)); | |
1852 | } | |
1853 | ||
12a50cc6 | 1854 | static bool lxcapi_set_config_item(struct lxc_container *c, const char *key, const char *v) |
72d0e1cb | 1855 | { |
72d0e1cb | 1856 | bool b = false; |
72d0e1cb SG |
1857 | |
1858 | if (!c) | |
1859 | return false; | |
1860 | ||
5cee8c50 | 1861 | if (container_mem_lock(c)) |
72d0e1cb SG |
1862 | return false; |
1863 | ||
96532523 | 1864 | b = set_config_item_locked(c, key, v); |
72d0e1cb | 1865 | |
5cee8c50 | 1866 | container_mem_unlock(c); |
72d0e1cb SG |
1867 | return b; |
1868 | } | |
1869 | ||
1870 | static char *lxcapi_config_file_name(struct lxc_container *c) | |
1871 | { | |
1872 | if (!c || !c->configfile) | |
1873 | return NULL; | |
1874 | return strdup(c->configfile); | |
1875 | } | |
1876 | ||
2a59a681 SH |
1877 | static const char *lxcapi_get_config_path(struct lxc_container *c) |
1878 | { | |
1879 | if (!c || !c->config_path) | |
1880 | return NULL; | |
1881 | return (const char *)(c->config_path); | |
1882 | } | |
1883 | ||
afeecbba SH |
1884 | /* |
1885 | * not for export | |
1886 | * Just recalculate the c->configfile based on the | |
1887 | * c->config_path, which must be set. | |
1888 | * The lxc_container must be locked or not yet public. | |
1889 | */ | |
1890 | static bool set_config_filename(struct lxc_container *c) | |
1891 | { | |
1892 | char *newpath; | |
1893 | int len, ret; | |
1894 | ||
1895 | if (!c->config_path) | |
1896 | return false; | |
1897 | ||
1898 | /* $lxc_path + "/" + c->name + "/" + "config" + '\0' */ | |
1899 | len = strlen(c->config_path) + strlen(c->name) + strlen("config") + 3; | |
1900 | newpath = malloc(len); | |
1901 | if (!newpath) | |
1902 | return false; | |
1903 | ||
1904 | ret = snprintf(newpath, len, "%s/%s/config", c->config_path, c->name); | |
1905 | if (ret < 0 || ret >= len) { | |
1906 | fprintf(stderr, "Error printing out config file name\n"); | |
1907 | free(newpath); | |
1908 | return false; | |
1909 | } | |
1910 | ||
1911 | if (c->configfile) | |
1912 | free(c->configfile); | |
1913 | c->configfile = newpath; | |
1914 | ||
1915 | return true; | |
1916 | } | |
1917 | ||
2a59a681 SH |
1918 | static bool lxcapi_set_config_path(struct lxc_container *c, const char *path) |
1919 | { | |
1920 | char *p; | |
1921 | bool b = false; | |
afeecbba | 1922 | char *oldpath = NULL; |
2a59a681 SH |
1923 | |
1924 | if (!c) | |
1925 | return b; | |
1926 | ||
5cee8c50 | 1927 | if (container_mem_lock(c)) |
2a59a681 SH |
1928 | return b; |
1929 | ||
1930 | p = strdup(path); | |
afeecbba SH |
1931 | if (!p) { |
1932 | ERROR("Out of memory setting new lxc path"); | |
2a59a681 | 1933 | goto err; |
afeecbba SH |
1934 | } |
1935 | ||
2a59a681 SH |
1936 | b = true; |
1937 | if (c->config_path) | |
afeecbba | 1938 | oldpath = c->config_path; |
2a59a681 | 1939 | c->config_path = p; |
afeecbba SH |
1940 | |
1941 | /* Since we've changed the config path, we have to change the | |
1942 | * config file name too */ | |
1943 | if (!set_config_filename(c)) { | |
1944 | ERROR("Out of memory setting new config filename"); | |
1945 | b = false; | |
1946 | free(c->config_path); | |
1947 | c->config_path = oldpath; | |
1948 | oldpath = NULL; | |
1949 | } | |
2a59a681 | 1950 | err: |
afeecbba SH |
1951 | if (oldpath) |
1952 | free(oldpath); | |
5cee8c50 | 1953 | container_mem_unlock(c); |
2a59a681 SH |
1954 | return b; |
1955 | } | |
1956 | ||
1957 | ||
794dd120 SH |
1958 | static bool lxcapi_set_cgroup_item(struct lxc_container *c, const char *subsys, const char *value) |
1959 | { | |
1960 | int ret; | |
794dd120 SH |
1961 | |
1962 | if (!c) | |
1963 | return false; | |
1964 | ||
3bc449ed | 1965 | if (is_stopped(c)) |
794dd120 SH |
1966 | return false; |
1967 | ||
3bc449ed SH |
1968 | if (container_disk_lock(c)) |
1969 | return false; | |
794dd120 | 1970 | |
33ad9f1a | 1971 | ret = lxc_cgroup_set(subsys, value, c->name, c->config_path); |
3bc449ed SH |
1972 | |
1973 | container_disk_unlock(c); | |
1974 | return ret == 0; | |
794dd120 SH |
1975 | } |
1976 | ||
1977 | static int lxcapi_get_cgroup_item(struct lxc_container *c, const char *subsys, char *retv, int inlen) | |
1978 | { | |
3bc449ed | 1979 | int ret; |
794dd120 | 1980 | |
6502006a | 1981 | if (!c) |
794dd120 SH |
1982 | return -1; |
1983 | ||
3bc449ed | 1984 | if (is_stopped(c)) |
794dd120 SH |
1985 | return -1; |
1986 | ||
3bc449ed SH |
1987 | if (container_disk_lock(c)) |
1988 | return -1; | |
794dd120 | 1989 | |
33ad9f1a | 1990 | ret = lxc_cgroup_get(subsys, retv, inlen, c->name, c->config_path); |
794dd120 | 1991 | |
3bc449ed | 1992 | container_disk_unlock(c); |
794dd120 SH |
1993 | return ret; |
1994 | } | |
1995 | ||
67e571de | 1996 | const char *lxc_get_default_config_path(void) |
83c98d82 DE |
1997 | { |
1998 | return default_lxc_path(); | |
1999 | } | |
794dd120 | 2000 | |
a8428dfa SH |
2001 | const char *lxc_get_default_lvm_vg(void) |
2002 | { | |
2003 | return default_lvm_vg(); | |
2004 | } | |
2005 | ||
f99c386b SS |
2006 | const char *lxc_get_default_lvm_thin_pool(void) |
2007 | { | |
2008 | return default_lvm_thin_pool(); | |
2009 | } | |
2010 | ||
a8428dfa SH |
2011 | const char *lxc_get_default_zfs_root(void) |
2012 | { | |
2013 | return default_zfs_root(); | |
2014 | } | |
2015 | ||
b6b918a1 SG |
2016 | const char *lxc_get_version(void) |
2017 | { | |
2018 | return lxc_version(); | |
2019 | } | |
2020 | ||
9be53773 SH |
2021 | static int copy_file(char *old, char *new) |
2022 | { | |
2023 | int in, out; | |
2024 | ssize_t len, ret; | |
2025 | char buf[8096]; | |
2026 | struct stat sbuf; | |
2027 | ||
2028 | if (file_exists(new)) { | |
2029 | ERROR("copy destination %s exists", new); | |
2030 | return -1; | |
2031 | } | |
2032 | ret = stat(old, &sbuf); | |
2033 | if (ret < 0) { | |
dfb31b25 | 2034 | INFO("Error stat'ing %s", old); |
9be53773 SH |
2035 | return -1; |
2036 | } | |
2037 | ||
025ed0f3 | 2038 | process_lock(); |
9be53773 | 2039 | in = open(old, O_RDONLY); |
025ed0f3 | 2040 | process_unlock(); |
9be53773 | 2041 | if (in < 0) { |
dfb31b25 | 2042 | SYSERROR("Error opening original file %s", old); |
9be53773 SH |
2043 | return -1; |
2044 | } | |
025ed0f3 | 2045 | process_lock(); |
9be53773 | 2046 | out = open(new, O_CREAT | O_EXCL | O_WRONLY, 0644); |
025ed0f3 | 2047 | process_unlock(); |
9be53773 | 2048 | if (out < 0) { |
dfb31b25 | 2049 | SYSERROR("Error opening new file %s", new); |
025ed0f3 | 2050 | process_lock(); |
9be53773 | 2051 | close(in); |
025ed0f3 | 2052 | process_unlock(); |
9be53773 SH |
2053 | return -1; |
2054 | } | |
2055 | ||
2056 | while (1) { | |
2057 | len = read(in, buf, 8096); | |
2058 | if (len < 0) { | |
dfb31b25 | 2059 | SYSERROR("Error reading old file %s", old); |
9be53773 SH |
2060 | goto err; |
2061 | } | |
2062 | if (len == 0) | |
2063 | break; | |
2064 | ret = write(out, buf, len); | |
2065 | if (ret < len) { // should we retry? | |
dfb31b25 | 2066 | SYSERROR("Error: write to new file %s was interrupted", new); |
9be53773 SH |
2067 | goto err; |
2068 | } | |
2069 | } | |
025ed0f3 | 2070 | process_lock(); |
9be53773 SH |
2071 | close(in); |
2072 | close(out); | |
025ed0f3 | 2073 | process_unlock(); |
9be53773 SH |
2074 | |
2075 | // we set mode, but not owner/group | |
2076 | ret = chmod(new, sbuf.st_mode); | |
2077 | if (ret) { | |
dfb31b25 | 2078 | SYSERROR("Error setting mode on %s", new); |
9be53773 SH |
2079 | return -1; |
2080 | } | |
2081 | ||
2082 | return 0; | |
2083 | ||
2084 | err: | |
025ed0f3 | 2085 | process_lock(); |
9be53773 SH |
2086 | close(in); |
2087 | close(out); | |
025ed0f3 | 2088 | process_unlock(); |
9be53773 SH |
2089 | return -1; |
2090 | } | |
2091 | ||
9be53773 SH |
2092 | static int copyhooks(struct lxc_container *oldc, struct lxc_container *c) |
2093 | { | |
2094 | int i; | |
2095 | int ret; | |
2096 | struct lxc_list *it; | |
2097 | ||
2098 | for (i=0; i<NUM_LXC_HOOKS; i++) { | |
2099 | lxc_list_for_each(it, &c->lxc_conf->hooks[i]) { | |
2100 | char *hookname = it->elem; | |
c32981c3 | 2101 | char *fname = strrchr(hookname, '/'); |
9be53773 SH |
2102 | char tmppath[MAXPATHLEN]; |
2103 | if (!fname) // relative path - we don't support, but maybe we should | |
2104 | return 0; | |
2105 | // copy the script, and change the entry in confile | |
2106 | ret = snprintf(tmppath, MAXPATHLEN, "%s/%s/%s", | |
2107 | c->config_path, c->name, fname+1); | |
2108 | if (ret < 0 || ret >= MAXPATHLEN) | |
2109 | return -1; | |
2110 | ret = copy_file(it->elem, tmppath); | |
2111 | if (ret < 0) | |
2112 | return -1; | |
2113 | free(it->elem); | |
2114 | it->elem = strdup(tmppath); | |
2115 | if (!it->elem) { | |
2116 | ERROR("out of memory copying hook path"); | |
2117 | return -1; | |
2118 | } | |
9be53773 SH |
2119 | } |
2120 | } | |
2121 | ||
2122 | c->save_config(c, NULL); | |
2123 | return 0; | |
2124 | } | |
2125 | ||
2126 | static void new_hwaddr(char *hwaddr) | |
2127 | { | |
025ed0f3 SH |
2128 | FILE *f; |
2129 | process_lock(); | |
2130 | f = fopen("/dev/urandom", "r"); | |
2131 | process_unlock(); | |
9be53773 SH |
2132 | if (f) { |
2133 | unsigned int seed; | |
2134 | int ret = fread(&seed, sizeof(seed), 1, f); | |
2135 | if (ret != 1) | |
2136 | seed = time(NULL); | |
025ed0f3 | 2137 | process_lock(); |
9be53773 | 2138 | fclose(f); |
025ed0f3 | 2139 | process_unlock(); |
9be53773 SH |
2140 | srand(seed); |
2141 | } else | |
2142 | srand(time(NULL)); | |
2143 | snprintf(hwaddr, 18, "00:16:3e:%02x:%02x:%02x", | |
2144 | rand() % 255, rand() % 255, rand() % 255); | |
2145 | } | |
2146 | ||
2147 | static void network_new_hwaddrs(struct lxc_container *c) | |
2148 | { | |
2149 | struct lxc_list *it; | |
2150 | ||
2151 | lxc_list_for_each(it, &c->lxc_conf->network) { | |
2152 | struct lxc_netdev *n = it->elem; | |
2153 | if (n->hwaddr) | |
2154 | new_hwaddr(n->hwaddr); | |
2155 | } | |
2156 | } | |
2157 | ||
2158 | static int copy_fstab(struct lxc_container *oldc, struct lxc_container *c) | |
2159 | { | |
2160 | char newpath[MAXPATHLEN]; | |
2161 | char *oldpath = oldc->lxc_conf->fstab; | |
2162 | int ret; | |
2163 | ||
2164 | if (!oldpath) | |
2165 | return 0; | |
2166 | ||
c32981c3 | 2167 | char *p = strrchr(oldpath, '/'); |
9be53773 SH |
2168 | if (!p) |
2169 | return -1; | |
2170 | ret = snprintf(newpath, MAXPATHLEN, "%s/%s%s", | |
2171 | c->config_path, c->name, p); | |
2172 | if (ret < 0 || ret >= MAXPATHLEN) { | |
2173 | ERROR("error printing new path for %s", oldpath); | |
2174 | return -1; | |
2175 | } | |
2176 | if (file_exists(newpath)) { | |
2177 | ERROR("error: fstab file %s exists", newpath); | |
2178 | return -1; | |
2179 | } | |
2180 | ||
2181 | if (copy_file(oldpath, newpath) < 0) { | |
2182 | ERROR("error: copying %s to %s", oldpath, newpath); | |
2183 | return -1; | |
2184 | } | |
2185 | free(c->lxc_conf->fstab); | |
2186 | c->lxc_conf->fstab = strdup(newpath); | |
2187 | if (!c->lxc_conf->fstab) { | |
2188 | ERROR("error: allocating pathname"); | |
2189 | return -1; | |
2190 | } | |
2191 | ||
2192 | return 0; | |
2193 | } | |
2194 | ||
dfb31b25 SH |
2195 | static void copy_rdepends(struct lxc_container *c, struct lxc_container *c0) |
2196 | { | |
2197 | char path0[MAXPATHLEN], path1[MAXPATHLEN]; | |
2198 | int ret; | |
2199 | ||
2200 | ret = snprintf(path0, MAXPATHLEN, "%s/%s/lxc_rdepends", c0->config_path, | |
2201 | c0->name); | |
2202 | if (ret < 0 || ret >= MAXPATHLEN) { | |
2203 | WARN("Error copying reverse dependencies"); | |
2204 | return; | |
2205 | } | |
2206 | ret = snprintf(path1, MAXPATHLEN, "%s/%s/lxc_rdepends", c->config_path, | |
2207 | c->name); | |
2208 | if (ret < 0 || ret >= MAXPATHLEN) { | |
2209 | WARN("Error copying reverse dependencies"); | |
2210 | return; | |
2211 | } | |
2212 | if (copy_file(path0, path1) < 0) { | |
2213 | INFO("Error copying reverse dependencies"); | |
2214 | return; | |
2215 | } | |
2216 | } | |
2217 | ||
2218 | static bool add_rdepends(struct lxc_container *c, struct lxc_container *c0) | |
2219 | { | |
2220 | int ret; | |
2221 | char path[MAXPATHLEN]; | |
2222 | FILE *f; | |
2223 | bool bret; | |
2224 | ||
2225 | ret = snprintf(path, MAXPATHLEN, "%s/%s/lxc_rdepends", c->config_path, | |
2226 | c->name); | |
2227 | if (ret < 0 || ret >= MAXPATHLEN) | |
2228 | return false; | |
025ed0f3 | 2229 | process_lock(); |
dfb31b25 | 2230 | f = fopen(path, "a"); |
025ed0f3 | 2231 | process_unlock(); |
dfb31b25 SH |
2232 | if (!f) |
2233 | return false; | |
2234 | bret = true; | |
2235 | // if anything goes wrong, just return an error | |
2236 | if (fprintf(f, "%s\n%s\n", c0->config_path, c0->name) < 0) | |
2237 | bret = false; | |
025ed0f3 | 2238 | process_lock(); |
dfb31b25 SH |
2239 | if (fclose(f) != 0) |
2240 | bret = false; | |
025ed0f3 | 2241 | process_unlock(); |
dfb31b25 SH |
2242 | return bret; |
2243 | } | |
2244 | ||
9be53773 SH |
2245 | static int copy_storage(struct lxc_container *c0, struct lxc_container *c, |
2246 | const char *newtype, int flags, const char *bdevdata, unsigned long newsize) | |
2247 | { | |
2248 | struct bdev *bdev; | |
dfb31b25 | 2249 | int need_rdep; |
9be53773 SH |
2250 | |
2251 | bdev = bdev_copy(c0->lxc_conf->rootfs.path, c0->name, c->name, | |
2252 | c0->config_path, c->config_path, newtype, !!(flags & LXC_CLONE_SNAPSHOT), | |
dfb31b25 | 2253 | bdevdata, newsize, &need_rdep); |
9be53773 | 2254 | if (!bdev) { |
dfb31b25 | 2255 | ERROR("Error copying storage"); |
9be53773 SH |
2256 | return -1; |
2257 | } | |
2258 | free(c->lxc_conf->rootfs.path); | |
2259 | c->lxc_conf->rootfs.path = strdup(bdev->src); | |
2260 | bdev_put(bdev); | |
dfb31b25 SH |
2261 | if (!c->lxc_conf->rootfs.path) { |
2262 | ERROR("Out of memory while setting storage path"); | |
9be53773 | 2263 | return -1; |
dfb31b25 | 2264 | } |
eee59f94 SH |
2265 | if (flags & LXC_CLONE_SNAPSHOT) |
2266 | copy_rdepends(c, c0); | |
dfb31b25 SH |
2267 | if (need_rdep) { |
2268 | if (!add_rdepends(c, c0)) | |
2269 | WARN("Error adding reverse dependency from %s to %s", | |
2270 | c->name, c0->name); | |
2271 | } | |
2272 | ||
2273 | mod_all_rdeps(c, true); | |
2274 | ||
9be53773 SH |
2275 | return 0; |
2276 | } | |
2277 | ||
1143ed39 DE |
2278 | static int clone_update_rootfs(struct lxc_container *c0, |
2279 | struct lxc_container *c, int flags, | |
2280 | char **hookargs) | |
9be53773 SH |
2281 | { |
2282 | int ret = -1; | |
2283 | char path[MAXPATHLEN]; | |
2284 | struct bdev *bdev; | |
2285 | FILE *fout; | |
2286 | pid_t pid; | |
148e91f5 | 2287 | struct lxc_conf *conf = c->lxc_conf; |
9be53773 SH |
2288 | |
2289 | /* update hostname in rootfs */ | |
2290 | /* we're going to mount, so run in a clean namespace to simplify cleanup */ | |
2291 | ||
2292 | pid = fork(); | |
2293 | if (pid < 0) | |
2294 | return -1; | |
2295 | if (pid > 0) | |
2296 | return wait_for_pid(pid); | |
2297 | ||
025ed0f3 | 2298 | process_unlock(); // we're no longer sharing |
9be53773 SH |
2299 | bdev = bdev_init(c->lxc_conf->rootfs.path, c->lxc_conf->rootfs.mount, NULL); |
2300 | if (!bdev) | |
2301 | exit(1); | |
cf3ef16d SH |
2302 | if (strcmp(bdev->type, "dir") != 0) { |
2303 | if (unshare(CLONE_NEWNS) < 0) { | |
2304 | ERROR("error unsharing mounts"); | |
2305 | exit(1); | |
2306 | } | |
2307 | if (bdev->ops->mount(bdev) < 0) | |
2308 | exit(1); | |
2309 | } else { // TODO come up with a better way | |
2310 | if (bdev->dest) | |
2311 | free(bdev->dest); | |
2312 | bdev->dest = strdup(bdev->src); | |
2313 | } | |
148e91f5 SH |
2314 | |
2315 | if (!lxc_list_empty(&conf->hooks[LXCHOOK_CLONE])) { | |
2316 | /* Start of environment variable setup for hooks */ | |
1143ed39 DE |
2317 | if (setenv("LXC_SRC_NAME", c0->name, 1)) { |
2318 | SYSERROR("failed to set environment variable for source container name"); | |
2319 | } | |
148e91f5 SH |
2320 | if (setenv("LXC_NAME", c->name, 1)) { |
2321 | SYSERROR("failed to set environment variable for container name"); | |
2322 | } | |
2323 | if (setenv("LXC_CONFIG_FILE", conf->rcfile, 1)) { | |
2324 | SYSERROR("failed to set environment variable for config path"); | |
2325 | } | |
2326 | if (setenv("LXC_ROOTFS_MOUNT", conf->rootfs.mount, 1)) { | |
2327 | SYSERROR("failed to set environment variable for rootfs mount"); | |
2328 | } | |
2329 | if (setenv("LXC_ROOTFS_PATH", conf->rootfs.path, 1)) { | |
2330 | SYSERROR("failed to set environment variable for rootfs mount"); | |
2331 | } | |
2332 | ||
283678ed | 2333 | if (run_lxc_hooks(c->name, "clone", conf, c->get_config_path(c), hookargs)) { |
148e91f5 SH |
2334 | ERROR("Error executing clone hook for %s", c->name); |
2335 | exit(1); | |
2336 | } | |
2337 | } | |
2338 | ||
2339 | if (!(flags & LXC_CLONE_KEEPNAME)) { | |
2340 | ret = snprintf(path, MAXPATHLEN, "%s/etc/hostname", bdev->dest); | |
2341 | if (ret < 0 || ret >= MAXPATHLEN) | |
2342 | exit(1); | |
8058be39 DE |
2343 | if (!file_exists(path)) |
2344 | exit(0); | |
148e91f5 SH |
2345 | if (!(fout = fopen(path, "w"))) { |
2346 | SYSERROR("unable to open %s: ignoring\n", path); | |
2347 | exit(0); | |
2348 | } | |
2349 | if (fprintf(fout, "%s", c->name) < 0) | |
2350 | exit(1); | |
2351 | if (fclose(fout) < 0) | |
2352 | exit(1); | |
9be53773 | 2353 | } |
9be53773 SH |
2354 | exit(0); |
2355 | } | |
2356 | ||
2357 | /* | |
2358 | * We want to support: | |
2359 | sudo lxc-clone -o o1 -n n1 -s -L|-fssize fssize -v|--vgname vgname \ | |
2360 | -p|--lvprefix lvprefix -t|--fstype fstype -B backingstore | |
2361 | ||
2362 | -s [ implies overlayfs] | |
2363 | -s -B overlayfs | |
2364 | -s -B aufs | |
2365 | ||
2366 | only rootfs gets converted (copied/snapshotted) on clone. | |
2367 | */ | |
2368 | ||
2369 | static int create_file_dirname(char *path) | |
2370 | { | |
c32981c3 | 2371 | char *p = strrchr(path, '/'); |
9be53773 SH |
2372 | int ret; |
2373 | ||
2374 | if (!p) | |
2375 | return -1; | |
2376 | *p = '\0'; | |
2377 | ret = mkdir(path, 0755); | |
2378 | if (ret && errno != EEXIST) | |
2379 | SYSERROR("creating container path %s\n", path); | |
2380 | *p = '/'; | |
2381 | return ret; | |
2382 | } | |
2383 | ||
2384 | struct lxc_container *lxcapi_clone(struct lxc_container *c, const char *newname, | |
2385 | const char *lxcpath, int flags, | |
148e91f5 SH |
2386 | const char *bdevtype, const char *bdevdata, unsigned long newsize, |
2387 | char **hookargs) | |
9be53773 SH |
2388 | { |
2389 | struct lxc_container *c2 = NULL; | |
2390 | char newpath[MAXPATHLEN]; | |
176d9acb | 2391 | int ret, storage_copied = 0; |
9be53773 SH |
2392 | const char *n, *l; |
2393 | FILE *fout; | |
2394 | ||
2395 | if (!c || !c->is_defined(c)) | |
2396 | return NULL; | |
2397 | ||
5cee8c50 | 2398 | if (container_mem_lock(c)) |
9be53773 SH |
2399 | return NULL; |
2400 | ||
39dc698c | 2401 | if (!is_stopped(c)) { |
9be53773 SH |
2402 | ERROR("error: Original container (%s) is running", c->name); |
2403 | goto out; | |
2404 | } | |
2405 | ||
2406 | // Make sure the container doesn't yet exist. | |
2407 | n = newname ? newname : c->name; | |
2408 | l = lxcpath ? lxcpath : c->get_config_path(c); | |
2409 | ret = snprintf(newpath, MAXPATHLEN, "%s/%s/config", l, n); | |
2410 | if (ret < 0 || ret >= MAXPATHLEN) { | |
2411 | SYSERROR("clone: failed making config pathname"); | |
2412 | goto out; | |
2413 | } | |
2414 | if (file_exists(newpath)) { | |
2415 | ERROR("error: clone: %s exists", newpath); | |
2416 | goto out; | |
2417 | } | |
2418 | ||
96532523 SH |
2419 | ret = create_file_dirname(newpath); |
2420 | if (ret < 0 && errno != EEXIST) { | |
9be53773 SH |
2421 | ERROR("Error creating container dir for %s", newpath); |
2422 | goto out; | |
2423 | } | |
2424 | ||
2425 | // copy the configuration, tweak it as needed, | |
025ed0f3 | 2426 | process_lock(); |
9be53773 | 2427 | fout = fopen(newpath, "w"); |
025ed0f3 | 2428 | process_unlock(); |
9be53773 SH |
2429 | if (!fout) { |
2430 | SYSERROR("open %s", newpath); | |
2431 | goto out; | |
2432 | } | |
2433 | write_config(fout, c->lxc_conf); | |
025ed0f3 | 2434 | process_lock(); |
9be53773 | 2435 | fclose(fout); |
025ed0f3 | 2436 | process_unlock(); |
9be53773 | 2437 | |
9be53773 SH |
2438 | sprintf(newpath, "%s/%s/rootfs", l, n); |
2439 | if (mkdir(newpath, 0755) < 0) { | |
2440 | SYSERROR("error creating %s", newpath); | |
2441 | goto out; | |
2442 | } | |
2443 | ||
2444 | c2 = lxc_container_new(n, l); | |
375c2258 | 2445 | if (!c2) { |
9be53773 SH |
2446 | ERROR("clone: failed to create new container (%s %s)", n, l); |
2447 | goto out; | |
2448 | } | |
2449 | ||
96532523 SH |
2450 | // update utsname |
2451 | if (!set_config_item_locked(c2, "lxc.utsname", newname)) { | |
2452 | ERROR("Error setting new hostname"); | |
2453 | goto out; | |
2454 | } | |
2455 | ||
2456 | ||
9be53773 SH |
2457 | // copy hooks if requested |
2458 | if (flags & LXC_CLONE_COPYHOOKS) { | |
2459 | ret = copyhooks(c, c2); | |
2460 | if (ret < 0) { | |
2461 | ERROR("error copying hooks"); | |
9be53773 SH |
2462 | goto out; |
2463 | } | |
2464 | } | |
2465 | ||
2466 | if (copy_fstab(c, c2) < 0) { | |
2467 | ERROR("error copying fstab"); | |
9be53773 SH |
2468 | goto out; |
2469 | } | |
2470 | ||
2471 | // update macaddrs | |
2472 | if (!(flags & LXC_CLONE_KEEPMACADDR)) | |
2473 | network_new_hwaddrs(c2); | |
2474 | ||
2475 | // copy/snapshot rootfs's | |
2476 | ret = copy_storage(c, c2, bdevtype, flags, bdevdata, newsize); | |
375c2258 | 2477 | if (ret < 0) |
9be53773 | 2478 | goto out; |
9be53773 | 2479 | |
176d9acb SH |
2480 | // We've now successfully created c2's storage, so clear it out if we |
2481 | // fail after this | |
2482 | storage_copied = 1; | |
2483 | ||
375c2258 | 2484 | if (!c2->save_config(c2, NULL)) |
9be53773 | 2485 | goto out; |
9be53773 | 2486 | |
1143ed39 | 2487 | if (clone_update_rootfs(c, c2, flags, hookargs) < 0) |
9be53773 | 2488 | goto out; |
9be53773 SH |
2489 | |
2490 | // TODO: update c's lxc.snapshot = count | |
5cee8c50 | 2491 | container_mem_unlock(c); |
9be53773 SH |
2492 | return c2; |
2493 | ||
2494 | out: | |
5cee8c50 | 2495 | container_mem_unlock(c); |
375c2258 | 2496 | if (c2) { |
176d9acb SH |
2497 | if (!storage_copied) |
2498 | c2->lxc_conf->rootfs.path = NULL; | |
375c2258 | 2499 | c2->destroy(c2); |
9be53773 | 2500 | lxc_container_put(c2); |
375c2258 | 2501 | } |
9be53773 SH |
2502 | |
2503 | return NULL; | |
2504 | } | |
2505 | ||
a0e93eeb CS |
2506 | 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) |
2507 | { | |
2508 | if (!c) | |
2509 | return -1; | |
2510 | ||
2511 | return lxc_attach(c->name, c->config_path, exec_function, exec_payload, options, attached_process); | |
2512 | } | |
2513 | ||
2514 | static int lxcapi_attach_run_wait(struct lxc_container *c, lxc_attach_options_t *options, const char *program, const char * const argv[]) | |
2515 | { | |
2516 | lxc_attach_command_t command; | |
2517 | pid_t pid; | |
2518 | int r; | |
2519 | ||
2520 | if (!c) | |
2521 | return -1; | |
2522 | ||
2523 | command.program = (char*)program; | |
2524 | command.argv = (char**)argv; | |
2525 | r = lxc_attach(c->name, c->config_path, lxc_attach_run_command, &command, options, &pid); | |
2526 | if (r < 0) { | |
2527 | ERROR("ups"); | |
2528 | return r; | |
2529 | } | |
2530 | return lxc_wait_for_pid_status(pid); | |
2531 | } | |
2532 | ||
f5dd1d53 SH |
2533 | int get_next_index(const char *lxcpath, char *cname) |
2534 | { | |
2535 | char *fname; | |
2536 | struct stat sb; | |
2537 | int i = 0, ret; | |
2538 | ||
2539 | fname = alloca(strlen(lxcpath) + 20); | |
2540 | while (1) { | |
2541 | sprintf(fname, "%s/snap%d", lxcpath, i); | |
2542 | ret = stat(fname, &sb); | |
2543 | if (ret != 0) | |
2544 | return i; | |
2545 | i++; | |
2546 | } | |
2547 | } | |
2548 | ||
2549 | static int lxcapi_snapshot(struct lxc_container *c, char *commentfile) | |
2550 | { | |
2551 | int i, flags, ret; | |
2552 | struct lxc_container *c2; | |
2553 | char snappath[MAXPATHLEN], newname[20]; | |
2554 | ||
2555 | // /var/lib/lxc -> /var/lib/lxcsnaps \0 | |
2556 | ret = snprintf(snappath, MAXPATHLEN, "%ssnaps/%s", c->config_path, c->name); | |
2557 | if (ret < 0 || ret >= MAXPATHLEN) | |
2558 | return -1; | |
2559 | i = get_next_index(snappath, c->name); | |
2560 | ||
2561 | if (mkdir_p(snappath, 0755) < 0) { | |
2562 | ERROR("Failed to create snapshot directory %s", snappath); | |
2563 | return -1; | |
2564 | } | |
2565 | ||
2566 | ret = snprintf(newname, 20, "snap%d", i); | |
2567 | if (ret < 0 || ret >= 20) | |
2568 | return -1; | |
2569 | ||
2570 | flags = LXC_CLONE_SNAPSHOT | LXC_CLONE_KEEPMACADDR | LXC_CLONE_KEEPNAME; | |
2571 | c2 = c->clone(c, newname, snappath, flags, NULL, NULL, 0, NULL); | |
2572 | if (!c2) { | |
2573 | ERROR("clone of %s:%s failed\n", c->config_path, c->name); | |
2574 | return -1; | |
2575 | } | |
2576 | ||
2577 | lxc_container_put(c2); | |
2578 | ||
2579 | // Now write down the creation time | |
2580 | time_t timer; | |
2581 | char buffer[25]; | |
2582 | struct tm* tm_info; | |
025ed0f3 | 2583 | FILE *f; |
f5dd1d53 SH |
2584 | |
2585 | time(&timer); | |
2586 | tm_info = localtime(&timer); | |
2587 | ||
2588 | strftime(buffer, 25, "%Y:%m:%d %H:%M:%S", tm_info); | |
2589 | ||
2590 | char *dfnam = alloca(strlen(snappath) + strlen(newname) + 5); | |
2591 | sprintf(dfnam, "%s/%s/ts", snappath, newname); | |
025ed0f3 SH |
2592 | process_lock(); |
2593 | f = fopen(dfnam, "w"); | |
2594 | process_unlock(); | |
f5dd1d53 SH |
2595 | if (!f) { |
2596 | ERROR("Failed to open %s\n", dfnam); | |
2597 | return -1; | |
2598 | } | |
2599 | if (fprintf(f, "%s", buffer) < 0) { | |
2600 | SYSERROR("Writing timestamp"); | |
2601 | fclose(f); | |
2602 | return -1; | |
2603 | } | |
025ed0f3 SH |
2604 | process_lock(); |
2605 | ret = fclose(f); | |
2606 | process_unlock(); | |
2607 | if (ret != 0) { | |
f5dd1d53 SH |
2608 | SYSERROR("Writing timestamp"); |
2609 | return -1; | |
2610 | } | |
2611 | ||
2612 | if (commentfile) { | |
2613 | // $p / $name / comment \0 | |
2614 | int len = strlen(snappath) + strlen(newname) + 10; | |
2615 | char *path = alloca(len); | |
2616 | sprintf(path, "%s/%s/comment", snappath, newname); | |
2617 | return copy_file(commentfile, path) < 0 ? -1 : i; | |
2618 | } | |
2619 | ||
2620 | return i; | |
2621 | } | |
2622 | ||
2623 | static void lxcsnap_free(struct lxc_snapshot *s) | |
2624 | { | |
2625 | if (s->name) | |
2626 | free(s->name); | |
2627 | if (s->comment_pathname) | |
2628 | free(s->comment_pathname); | |
2629 | if (s->timestamp) | |
2630 | free(s->timestamp); | |
2631 | if (s->lxcpath) | |
2632 | free(s->lxcpath); | |
2633 | } | |
2634 | ||
2635 | static char *get_snapcomment_path(char* snappath, char *name) | |
2636 | { | |
2637 | // $snappath/$name/comment | |
2638 | int ret, len = strlen(snappath) + strlen(name) + 10; | |
2639 | char *s = malloc(len); | |
2640 | ||
2641 | if (s) { | |
2642 | ret = snprintf(s, len, "%s/%s/comment", snappath, name); | |
2643 | if (ret < 0 || ret >= len) { | |
2644 | free(s); | |
2645 | s = NULL; | |
2646 | } | |
2647 | } | |
2648 | return s; | |
2649 | } | |
2650 | ||
2651 | static char *get_timestamp(char* snappath, char *name) | |
2652 | { | |
2653 | char path[MAXPATHLEN], *s = NULL; | |
2654 | int ret, len; | |
2655 | FILE *fin; | |
2656 | ||
2657 | ret = snprintf(path, MAXPATHLEN, "%s/%s/ts", snappath, name); | |
2658 | if (ret < 0 || ret >= MAXPATHLEN) | |
2659 | return NULL; | |
025ed0f3 SH |
2660 | process_lock(); |
2661 | fin = fopen(path, "r"); | |
2662 | process_unlock(); | |
2663 | if (!fin) | |
f5dd1d53 SH |
2664 | return NULL; |
2665 | (void) fseek(fin, 0, SEEK_END); | |
2666 | len = ftell(fin); | |
2667 | (void) fseek(fin, 0, SEEK_SET); | |
2668 | if (len > 0) { | |
2669 | s = malloc(len+1); | |
2670 | if (s) { | |
2671 | s[len] = '\0'; | |
2672 | if (fread(s, 1, len, fin) != len) { | |
2673 | SYSERROR("reading timestamp"); | |
2674 | free(s); | |
2675 | s = NULL; | |
2676 | } | |
2677 | } | |
2678 | } | |
025ed0f3 | 2679 | process_lock(); |
f5dd1d53 | 2680 | fclose(fin); |
025ed0f3 | 2681 | process_unlock(); |
f5dd1d53 SH |
2682 | return s; |
2683 | } | |
2684 | ||
2685 | static int lxcapi_snapshot_list(struct lxc_container *c, struct lxc_snapshot **ret_snaps) | |
2686 | { | |
2687 | char snappath[MAXPATHLEN], path2[MAXPATHLEN]; | |
2688 | int dirlen, count = 0, ret; | |
2689 | struct dirent dirent, *direntp; | |
2690 | struct lxc_snapshot *snaps =NULL, *nsnaps; | |
2691 | DIR *dir; | |
2692 | ||
2693 | if (!c || !lxcapi_is_defined(c)) | |
2694 | return -1; | |
2695 | // snappath is ${lxcpath}snaps/${lxcname}/ | |
2696 | dirlen = snprintf(snappath, MAXPATHLEN, "%ssnaps/%s", c->config_path, c->name); | |
2697 | if (dirlen < 0 || dirlen >= MAXPATHLEN) { | |
2698 | ERROR("path name too long"); | |
2699 | return -1; | |
2700 | } | |
025ed0f3 SH |
2701 | process_lock(); |
2702 | dir = opendir(snappath); | |
2703 | process_unlock(); | |
2704 | if (!dir) { | |
f5dd1d53 SH |
2705 | INFO("failed to open %s - assuming no snapshots", snappath); |
2706 | return 0; | |
2707 | } | |
2708 | ||
2709 | while (!readdir_r(dir, &dirent, &direntp)) { | |
2710 | if (!direntp) | |
2711 | break; | |
2712 | ||
2713 | if (!strcmp(direntp->d_name, ".")) | |
2714 | continue; | |
2715 | ||
2716 | if (!strcmp(direntp->d_name, "..")) | |
2717 | continue; | |
2718 | ||
2719 | ret = snprintf(path2, MAXPATHLEN, "%s/%s/config", snappath, direntp->d_name); | |
2720 | if (ret < 0 || ret >= MAXPATHLEN) { | |
2721 | ERROR("pathname too long"); | |
2722 | goto out_free; | |
2723 | } | |
2724 | if (!file_exists(path2)) | |
2725 | continue; | |
2726 | nsnaps = realloc(snaps, (count + 1)*sizeof(*snaps)); | |
2727 | if (!nsnaps) { | |
2728 | SYSERROR("Out of memory"); | |
2729 | goto out_free; | |
2730 | } | |
2731 | snaps = nsnaps; | |
2732 | snaps[count].free = lxcsnap_free; | |
2733 | snaps[count].name = strdup(direntp->d_name); | |
2734 | if (!snaps[count].name) | |
2735 | goto out_free; | |
2736 | snaps[count].lxcpath = strdup(snappath); | |
2737 | if (!snaps[count].lxcpath) { | |
2738 | free(snaps[count].name); | |
2739 | goto out_free; | |
2740 | } | |
2741 | snaps[count].comment_pathname = get_snapcomment_path(snappath, direntp->d_name); | |
2742 | snaps[count].timestamp = get_timestamp(snappath, direntp->d_name); | |
2743 | count++; | |
2744 | } | |
2745 | ||
025ed0f3 | 2746 | process_lock(); |
f5dd1d53 SH |
2747 | if (closedir(dir)) |
2748 | WARN("failed to close directory"); | |
025ed0f3 | 2749 | process_unlock(); |
f5dd1d53 SH |
2750 | |
2751 | *ret_snaps = snaps; | |
2752 | return count; | |
2753 | ||
2754 | out_free: | |
2755 | if (snaps) { | |
2756 | int i; | |
2757 | for (i=0; i<count; i++) | |
2758 | lxcsnap_free(&snaps[i]); | |
2759 | free(snaps); | |
2760 | } | |
9baa57bd SH |
2761 | process_lock(); |
2762 | if (closedir(dir)) | |
2763 | WARN("failed to close directory"); | |
2764 | process_unlock(); | |
f5dd1d53 SH |
2765 | return -1; |
2766 | } | |
2767 | ||
2768 | static bool lxcapi_snapshot_restore(struct lxc_container *c, char *snapname, char *newname) | |
2769 | { | |
2770 | char clonelxcpath[MAXPATHLEN]; | |
2771 | int ret; | |
2772 | struct lxc_container *snap, *rest; | |
2773 | struct bdev *bdev; | |
2774 | bool b = false; | |
2775 | ||
2776 | if (!c || !c->name || !c->config_path) | |
2777 | return false; | |
2778 | ||
2779 | bdev = bdev_init(c->lxc_conf->rootfs.path, c->lxc_conf->rootfs.mount, NULL); | |
2780 | if (!bdev) { | |
2781 | ERROR("Failed to find original backing store type"); | |
2782 | return false; | |
2783 | } | |
2784 | ||
2785 | if (!newname) | |
2786 | newname = c->name; | |
2787 | if (strcmp(c->name, newname) == 0) { | |
2788 | if (!lxcapi_destroy(c)) { | |
2789 | ERROR("Could not destroy existing container %s", newname); | |
2790 | bdev_put(bdev); | |
2791 | return false; | |
2792 | } | |
2793 | } | |
2794 | ret = snprintf(clonelxcpath, MAXPATHLEN, "%ssnaps/%s", c->config_path, c->name); | |
2795 | if (ret < 0 || ret >= MAXPATHLEN) { | |
2796 | bdev_put(bdev); | |
2797 | return false; | |
2798 | } | |
2799 | // how should we lock this? | |
2800 | ||
2801 | snap = lxc_container_new(snapname, clonelxcpath); | |
2802 | if (!snap || !lxcapi_is_defined(snap)) { | |
2803 | ERROR("Could not open snapshot %s", snapname); | |
2804 | if (snap) lxc_container_put(snap); | |
2805 | bdev_put(bdev); | |
2806 | return false; | |
2807 | } | |
2808 | ||
2809 | rest = lxcapi_clone(snap, newname, c->config_path, 0, bdev->type, NULL, 0, NULL); | |
2810 | bdev_put(bdev); | |
2811 | if (rest && lxcapi_is_defined(rest)) | |
2812 | b = true; | |
2813 | if (rest) | |
2814 | lxc_container_put(rest); | |
2815 | lxc_container_put(snap); | |
2816 | return b; | |
2817 | } | |
2818 | ||
771d96b3 ÇO |
2819 | static bool lxcapi_snapshot_destroy(struct lxc_container *c, char *snapname) |
2820 | { | |
2821 | int ret; | |
2822 | char clonelxcpath[MAXPATHLEN]; | |
2823 | struct lxc_container *snap = NULL; | |
2824 | ||
2825 | if (!c || !c->name || !c->config_path) | |
2826 | return false; | |
2827 | ||
2828 | ret = snprintf(clonelxcpath, MAXPATHLEN, "%ssnaps/%s", c->config_path, c->name); | |
2829 | if (ret < 0 || ret >= MAXPATHLEN) | |
2830 | goto err; | |
2831 | ||
2832 | snap = lxc_container_new(snapname, clonelxcpath); | |
2833 | if (!snap || !lxcapi_is_defined(snap)) { | |
2834 | ERROR("Could not find snapshot %s", snapname); | |
2835 | goto err; | |
2836 | } | |
2837 | ||
2838 | if (!lxcapi_destroy(snap)) { | |
2839 | ERROR("Could not destroy snapshot %s", snapname); | |
2840 | goto err; | |
2841 | } | |
2842 | lxc_container_put(snap); | |
2843 | ||
2844 | return true; | |
2845 | err: | |
2846 | if (snap) | |
2847 | lxc_container_put(snap); | |
2848 | return false; | |
2849 | } | |
2850 | ||
b494d2dd SH |
2851 | static bool lxcapi_may_control(struct lxc_container *c) |
2852 | { | |
2853 | return lxc_try_cmd(c->name, c->config_path) == 0; | |
2854 | } | |
2855 | ||
a0e93eeb CS |
2856 | static int lxcapi_attach_run_waitl(struct lxc_container *c, lxc_attach_options_t *options, const char *program, const char *arg, ...) |
2857 | { | |
2858 | va_list ap; | |
2859 | const char **argv; | |
2860 | int ret; | |
2861 | ||
2862 | if (!c) | |
2863 | return -1; | |
2864 | ||
2865 | va_start(ap, arg); | |
2866 | argv = lxc_va_arg_list_to_argv_const(ap, 1); | |
2867 | va_end(ap); | |
2868 | ||
2869 | if (!argv) { | |
2870 | ERROR("Memory allocation error."); | |
2871 | return -1; | |
2872 | } | |
2873 | argv[0] = arg; | |
2874 | ||
2875 | ret = lxcapi_attach_run_wait(c, options, program, (const char * const *)argv); | |
2876 | free((void*)argv); | |
2877 | return ret; | |
2878 | } | |
2879 | ||
afeecbba | 2880 | struct lxc_container *lxc_container_new(const char *name, const char *configpath) |
72d0e1cb SG |
2881 | { |
2882 | struct lxc_container *c; | |
72d0e1cb SG |
2883 | |
2884 | c = malloc(sizeof(*c)); | |
2885 | if (!c) { | |
2886 | fprintf(stderr, "failed to malloc lxc_container\n"); | |
2887 | return NULL; | |
2888 | } | |
2889 | memset(c, 0, sizeof(*c)); | |
2890 | ||
afeecbba SH |
2891 | if (configpath) |
2892 | c->config_path = strdup(configpath); | |
2893 | else | |
67e571de | 2894 | c->config_path = strdup(default_lxc_path()); |
afeecbba | 2895 | |
2a59a681 SH |
2896 | if (!c->config_path) { |
2897 | fprintf(stderr, "Out of memory"); | |
2898 | goto err; | |
2899 | } | |
2900 | ||
f5dd1d53 | 2901 | remove_trailing_slashes(c->config_path); |
72d0e1cb SG |
2902 | c->name = malloc(strlen(name)+1); |
2903 | if (!c->name) { | |
2904 | fprintf(stderr, "Error allocating lxc_container name\n"); | |
2905 | goto err; | |
2906 | } | |
2907 | strcpy(c->name, name); | |
2908 | ||
2909 | c->numthreads = 1; | |
df271a59 | 2910 | if (!(c->slock = lxc_newlock(c->config_path, name))) { |
72d0e1cb SG |
2911 | fprintf(stderr, "failed to create lock\n"); |
2912 | goto err; | |
2913 | } | |
2914 | ||
df271a59 | 2915 | if (!(c->privlock = lxc_newlock(NULL, NULL))) { |
72d0e1cb SG |
2916 | fprintf(stderr, "failed to alloc privlock\n"); |
2917 | goto err; | |
2918 | } | |
2919 | ||
afeecbba | 2920 | if (!set_config_filename(c)) { |
72d0e1cb SG |
2921 | fprintf(stderr, "Error allocating config file pathname\n"); |
2922 | goto err; | |
2923 | } | |
72d0e1cb SG |
2924 | |
2925 | if (file_exists(c->configfile)) | |
2926 | lxcapi_load_config(c, NULL); | |
2927 | ||
3e625e2d SH |
2928 | if (ongoing_create(c) == 2) { |
2929 | ERROR("Error: %s creation was not completed", c->name); | |
1897e3bc SH |
2930 | lxcapi_destroy(c); |
2931 | lxc_conf_free(c->lxc_conf); | |
2932 | c->lxc_conf = NULL; | |
3e625e2d SH |
2933 | } |
2934 | ||
72d0e1cb SG |
2935 | // assign the member functions |
2936 | c->is_defined = lxcapi_is_defined; | |
2937 | c->state = lxcapi_state; | |
2938 | c->is_running = lxcapi_is_running; | |
2939 | c->freeze = lxcapi_freeze; | |
2940 | c->unfreeze = lxcapi_unfreeze; | |
0115f8fd | 2941 | c->console = lxcapi_console; |
b5159817 | 2942 | c->console_getfd = lxcapi_console_getfd; |
72d0e1cb SG |
2943 | c->init_pid = lxcapi_init_pid; |
2944 | c->load_config = lxcapi_load_config; | |
2945 | c->want_daemonize = lxcapi_want_daemonize; | |
130a1888 | 2946 | c->want_close_all_fds = lxcapi_want_close_all_fds; |
72d0e1cb SG |
2947 | c->start = lxcapi_start; |
2948 | c->startl = lxcapi_startl; | |
2949 | c->stop = lxcapi_stop; | |
2950 | c->config_file_name = lxcapi_config_file_name; | |
2951 | c->wait = lxcapi_wait; | |
2952 | c->set_config_item = lxcapi_set_config_item; | |
2953 | c->destroy = lxcapi_destroy; | |
2954 | c->save_config = lxcapi_save_config; | |
2955 | c->get_keys = lxcapi_get_keys; | |
2956 | c->create = lxcapi_create; | |
2957 | c->createl = lxcapi_createl; | |
2958 | c->shutdown = lxcapi_shutdown; | |
3e625e2d | 2959 | c->reboot = lxcapi_reboot; |
72d0e1cb SG |
2960 | c->clear_config_item = lxcapi_clear_config_item; |
2961 | c->get_config_item = lxcapi_get_config_item; | |
794dd120 SH |
2962 | c->get_cgroup_item = lxcapi_get_cgroup_item; |
2963 | c->set_cgroup_item = lxcapi_set_cgroup_item; | |
2a59a681 SH |
2964 | c->get_config_path = lxcapi_get_config_path; |
2965 | c->set_config_path = lxcapi_set_config_path; | |
9be53773 | 2966 | c->clone = lxcapi_clone; |
799f29ab | 2967 | c->get_interfaces = lxcapi_get_interfaces; |
9c83a661 | 2968 | c->get_ips = lxcapi_get_ips; |
a0e93eeb CS |
2969 | c->attach = lxcapi_attach; |
2970 | c->attach_run_wait = lxcapi_attach_run_wait; | |
2971 | c->attach_run_waitl = lxcapi_attach_run_waitl; | |
f5dd1d53 SH |
2972 | c->snapshot = lxcapi_snapshot; |
2973 | c->snapshot_list = lxcapi_snapshot_list; | |
2974 | c->snapshot_restore = lxcapi_snapshot_restore; | |
771d96b3 | 2975 | c->snapshot_destroy = lxcapi_snapshot_destroy; |
b494d2dd | 2976 | c->may_control = lxcapi_may_control; |
72d0e1cb SG |
2977 | |
2978 | /* we'll allow the caller to update these later */ | |
ab1bf971 | 2979 | if (lxc_log_init(NULL, "none", NULL, "lxc_container", 0, c->config_path)) { |
72d0e1cb SG |
2980 | fprintf(stderr, "failed to open log\n"); |
2981 | goto err; | |
2982 | } | |
2983 | ||
72d0e1cb SG |
2984 | return c; |
2985 | ||
2986 | err: | |
2987 | lxc_container_free(c); | |
2988 | return NULL; | |
2989 | } | |
2990 | ||
4a7c7daa | 2991 | int lxc_get_wait_states(const char **states) |
72d0e1cb SG |
2992 | { |
2993 | int i; | |
2994 | ||
2995 | if (states) | |
2996 | for (i=0; i<MAX_STATE; i++) | |
2997 | states[i] = lxc_state2str(i); | |
2998 | return MAX_STATE; | |
2999 | } | |
a41f104b | 3000 | |
a41f104b SH |
3001 | /* |
3002 | * These next two could probably be done smarter with reusing a common function | |
3003 | * with different iterators and tests... | |
3004 | */ | |
3005 | int list_defined_containers(const char *lxcpath, char ***names, struct lxc_container ***cret) | |
3006 | { | |
3007 | DIR *dir; | |
3008 | int i, cfound = 0, nfound = 0; | |
3009 | struct dirent dirent, *direntp; | |
3010 | struct lxc_container *c; | |
3011 | ||
3012 | if (!lxcpath) | |
3013 | lxcpath = default_lxc_path(); | |
3014 | ||
3015 | process_lock(); | |
3016 | dir = opendir(lxcpath); | |
3017 | process_unlock(); | |
3018 | ||
3019 | if (!dir) { | |
3020 | SYSERROR("opendir on lxcpath"); | |
3021 | return -1; | |
3022 | } | |
3023 | ||
3024 | if (cret) | |
3025 | *cret = NULL; | |
3026 | if (names) | |
3027 | *names = NULL; | |
3028 | ||
3029 | while (!readdir_r(dir, &dirent, &direntp)) { | |
3030 | if (!direntp) | |
3031 | break; | |
3032 | if (!strcmp(direntp->d_name, ".")) | |
3033 | continue; | |
3034 | if (!strcmp(direntp->d_name, "..")) | |
3035 | continue; | |
3036 | ||
3037 | if (!config_file_exists(lxcpath, direntp->d_name)) | |
3038 | continue; | |
3039 | ||
3040 | if (names) { | |
9c88ff1f | 3041 | if (!add_to_array(names, direntp->d_name, cfound)) |
a41f104b SH |
3042 | goto free_bad; |
3043 | } | |
3044 | cfound++; | |
3045 | ||
3046 | if (!cret) { | |
3047 | nfound++; | |
3048 | continue; | |
3049 | } | |
3050 | ||
3051 | c = lxc_container_new(direntp->d_name, lxcpath); | |
3052 | if (!c) { | |
3053 | INFO("Container %s:%s has a config but could not be loaded", | |
3054 | lxcpath, direntp->d_name); | |
3055 | if (names) | |
9c88ff1f ÇO |
3056 | if(!remove_from_array(names, direntp->d_name, cfound--)) |
3057 | goto free_bad; | |
a41f104b SH |
3058 | continue; |
3059 | } | |
3060 | if (!lxcapi_is_defined(c)) { | |
3061 | INFO("Container %s:%s has a config but is not defined", | |
3062 | lxcpath, direntp->d_name); | |
3063 | if (names) | |
9c88ff1f ÇO |
3064 | if(!remove_from_array(names, direntp->d_name, cfound--)) |
3065 | goto free_bad; | |
a41f104b SH |
3066 | lxc_container_put(c); |
3067 | continue; | |
3068 | } | |
3069 | ||
2871830a | 3070 | if (!add_to_clist(cret, c, nfound, true)) { |
a41f104b SH |
3071 | lxc_container_put(c); |
3072 | goto free_bad; | |
3073 | } | |
3074 | nfound++; | |
3075 | } | |
3076 | ||
3077 | process_lock(); | |
3078 | closedir(dir); | |
3079 | process_unlock(); | |
3080 | return nfound; | |
3081 | ||
3082 | free_bad: | |
3083 | if (names && *names) { | |
3084 | for (i=0; i<cfound; i++) | |
3085 | free((*names)[i]); | |
3086 | free(*names); | |
3087 | } | |
3088 | if (cret && *cret) { | |
3089 | for (i=0; i<nfound; i++) | |
3090 | lxc_container_put((*cret)[i]); | |
3091 | free(*cret); | |
3092 | } | |
3093 | process_lock(); | |
3094 | closedir(dir); | |
3095 | process_unlock(); | |
3096 | return -1; | |
3097 | } | |
3098 | ||
3099 | int list_active_containers(const char *lxcpath, char ***names, struct lxc_container ***cret) | |
3100 | { | |
3101 | int i, cfound = 0, nfound = 0; | |
3102 | int lxcpath_len; | |
3103 | char *line = NULL; | |
9c88ff1f | 3104 | char **unique_names = NULL; |
a41f104b SH |
3105 | size_t len = 0; |
3106 | struct lxc_container *c; | |
3107 | ||
3108 | if (!lxcpath) | |
3109 | lxcpath = default_lxc_path(); | |
3110 | lxcpath_len = strlen(lxcpath); | |
3111 | ||
3112 | if (cret) | |
3113 | *cret = NULL; | |
3114 | if (names) | |
3115 | *names = NULL; | |
3116 | ||
3117 | process_lock(); | |
3118 | FILE *f = fopen("/proc/net/unix", "r"); | |
3119 | process_unlock(); | |
3120 | if (!f) | |
3121 | return -1; | |
3122 | ||
3123 | while (getline(&line, &len, f) != -1) { | |
0f8f9c8a | 3124 | char *p = strrchr(line, ' '), *p2; |
a41f104b SH |
3125 | if (!p) |
3126 | continue; | |
3127 | p++; | |
3128 | if (*p != 0x40) | |
3129 | continue; | |
3130 | p++; | |
3131 | if (strncmp(p, lxcpath, lxcpath_len) != 0) | |
3132 | continue; | |
3133 | p += lxcpath_len; | |
3134 | while (*p == '/') | |
3135 | p++; | |
3136 | ||
3137 | // Now p is the start of lxc_name | |
3138 | p2 = index(p, '/'); | |
3139 | if (!p2 || strncmp(p2, "/command", 8) != 0) | |
3140 | continue; | |
3141 | *p2 = '\0'; | |
3142 | ||
9c88ff1f ÇO |
3143 | if (array_contains(&unique_names, p, nfound)) |
3144 | continue; | |
3145 | ||
3146 | if (!add_to_array(&unique_names, p, nfound)) | |
3147 | goto free_bad; | |
3148 | ||
a41f104b SH |
3149 | cfound++; |
3150 | ||
3151 | if (!cret) { | |
3152 | nfound++; | |
3153 | continue; | |
3154 | } | |
3155 | ||
3156 | c = lxc_container_new(p, lxcpath); | |
3157 | if (!c) { | |
3158 | INFO("Container %s:%s is running but could not be loaded", | |
3159 | lxcpath, p); | |
9c88ff1f ÇO |
3160 | if (names) { |
3161 | if(!remove_from_array(&unique_names, p, cfound--)) | |
3162 | goto free_bad; | |
3163 | } | |
a41f104b SH |
3164 | continue; |
3165 | } | |
3166 | ||
3167 | /* | |
3168 | * If this is an anonymous container, then is_defined *can* | |
3169 | * return false. So we don't do that check. Count on the | |
3170 | * fact that the command socket exists. | |
3171 | */ | |
3172 | ||
2871830a | 3173 | if (!add_to_clist(cret, c, nfound, true)) { |
a41f104b SH |
3174 | lxc_container_put(c); |
3175 | goto free_bad; | |
3176 | } | |
3177 | nfound++; | |
3178 | } | |
3179 | ||
9c88ff1f ÇO |
3180 | if (names) |
3181 | *names = unique_names; | |
3182 | ||
e853a32d ÇO |
3183 | if (line) |
3184 | free(line); | |
3185 | ||
a41f104b SH |
3186 | process_lock(); |
3187 | fclose(f); | |
3188 | process_unlock(); | |
3189 | return nfound; | |
3190 | ||
3191 | free_bad: | |
3192 | if (names && *names) { | |
3193 | for (i=0; i<cfound; i++) | |
3194 | free((*names)[i]); | |
3195 | free(*names); | |
3196 | } | |
3197 | if (cret && *cret) { | |
3198 | for (i=0; i<nfound; i++) | |
3199 | lxc_container_put((*cret)[i]); | |
3200 | free(*cret); | |
3201 | } | |
e853a32d ÇO |
3202 | if (line) |
3203 | free(line); | |
3204 | ||
a41f104b SH |
3205 | process_lock(); |
3206 | fclose(f); | |
3207 | process_unlock(); | |
3208 | return -1; | |
3209 | } | |
2871830a DE |
3210 | |
3211 | int list_all_containers(const char *lxcpath, char ***nret, | |
3212 | struct lxc_container ***cret) | |
3213 | { | |
3214 | int i, ret, active_cnt, ct_cnt, ct_list_cnt; | |
3215 | char **active_name; | |
3216 | char **ct_name; | |
3217 | struct lxc_container **ct_list = NULL; | |
3218 | ||
3219 | ct_cnt = list_defined_containers(lxcpath, &ct_name, NULL); | |
3220 | if (ct_cnt < 0) | |
3221 | return ct_cnt; | |
3222 | ||
3223 | active_cnt = list_active_containers(lxcpath, &active_name, NULL); | |
3224 | if (active_cnt < 0) { | |
3225 | ret = active_cnt; | |
3226 | goto free_ct_name; | |
3227 | } | |
3228 | ||
3229 | for (i = 0; i < active_cnt; i++) { | |
3230 | if (!array_contains(&ct_name, active_name[i], ct_cnt)) { | |
3231 | if (!add_to_array(&ct_name, active_name[i], ct_cnt)) { | |
3232 | ret = -1; | |
3233 | goto free_active_name; | |
3234 | } | |
3235 | ct_cnt++; | |
3236 | } | |
3237 | free(active_name[i]); | |
3238 | active_name[i] = NULL; | |
3239 | } | |
3240 | free(active_name); | |
3241 | active_name = NULL; | |
3242 | active_cnt = 0; | |
3243 | ||
3244 | for (i = 0, ct_list_cnt = 0; i < ct_cnt && cret; i++) { | |
3245 | struct lxc_container *c; | |
3246 | ||
3247 | c = lxc_container_new(ct_name[i], lxcpath); | |
3248 | if (!c) { | |
3249 | WARN("Container %s:%s could not be loaded", lxcpath, ct_name[i]); | |
3250 | remove_from_array(&ct_name, ct_name[i], ct_cnt--); | |
3251 | continue; | |
3252 | } | |
3253 | ||
3254 | if (!add_to_clist(&ct_list, c, ct_list_cnt, false)) { | |
3255 | lxc_container_put(c); | |
3256 | ret = -1; | |
3257 | goto free_ct_list; | |
3258 | } | |
3259 | ct_list_cnt++; | |
3260 | } | |
3261 | ||
3262 | if (cret) | |
3263 | *cret = ct_list; | |
3264 | ||
3265 | if (nret) | |
3266 | *nret = ct_name; | |
3267 | else { | |
3268 | ret = ct_cnt; | |
3269 | goto free_ct_name; | |
3270 | } | |
3271 | return ct_cnt; | |
3272 | ||
3273 | free_ct_list: | |
3274 | for (i = 0; i < ct_list_cnt; i++) { | |
3275 | lxc_container_put(ct_list[i]); | |
3276 | } | |
3277 | if (ct_list) | |
3278 | free(ct_list); | |
3279 | ||
3280 | free_active_name: | |
3281 | for (i = 0; i < active_cnt; i++) { | |
3282 | if (active_name[i]) | |
3283 | free(active_name[i]); | |
3284 | } | |
3285 | if (active_name) | |
3286 | free(active_name); | |
3287 | ||
3288 | free_ct_name: | |
3289 | for (i = 0; i < ct_cnt; i++) { | |
3290 | free(ct_name[i]); | |
3291 | } | |
3292 | free(ct_name); | |
3293 | return ret; | |
3294 | } |