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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 |
148a9d27 | 22 | #include <assert.h> |
a0e93eeb | 23 | #include <stdarg.h> |
71454076 | 24 | #include <pthread.h> |
9be53773 SH |
25 | #include <unistd.h> |
26 | #include <sys/types.h> | |
27 | #include <sys/wait.h> | |
4de2791f | 28 | #include <sys/mount.h> |
9be53773 | 29 | #include <errno.h> |
93dc5327 | 30 | #include <fcntl.h> |
9be53773 | 31 | #include <sched.h> |
f5dd1d53 | 32 | #include <dirent.h> |
9be53773 | 33 | #include "config.h" |
72d0e1cb SG |
34 | #include "lxc.h" |
35 | #include "state.h" | |
948955a2 | 36 | #include <lxc/lxccontainer.h> |
72d0e1cb | 37 | #include "conf.h" |
72d0e1cb | 38 | #include "confile.h" |
b5159817 | 39 | #include "console.h" |
72d0e1cb SG |
40 | #include "cgroup.h" |
41 | #include "commands.h" | |
b6b918a1 | 42 | #include "version.h" |
72d0e1cb | 43 | #include "log.h" |
9be53773 | 44 | #include "bdev.h" |
6a44839f | 45 | #include "utils.h" |
a0e93eeb | 46 | #include "attach.h" |
2a59a681 | 47 | #include <lxc/utils.h> |
e51d4895 | 48 | #include <lxc/monitor.h> |
e768f9c0 | 49 | #include <lxc/namespace.h> |
9c83a661 | 50 | #include <sched.h> |
9c83a661 | 51 | #include <arpa/inet.h> |
a9a0ed90 | 52 | #include <libgen.h> |
95ee490b | 53 | #include "lxclock.h" |
4ba0d9af SG |
54 | |
55 | #if HAVE_IFADDRS_H | |
9c83a661 | 56 | #include <ifaddrs.h> |
4ba0d9af SG |
57 | #else |
58 | #include <../include/ifaddrs.h> | |
59 | #endif | |
72d0e1cb | 60 | |
dfb31b25 SH |
61 | #ifndef HAVE_GETLINE |
62 | #ifdef HAVE_FGETLN | |
63 | #include <../include/getline.h> | |
64 | #endif | |
65 | #endif | |
66 | ||
a9a0ed90 ÇO |
67 | #define MAX_BUFFER 4096 |
68 | ||
72d0e1cb SG |
69 | lxc_log_define(lxc_container, lxc); |
70 | ||
f0ca2726 | 71 | static bool file_exists(const char *f) |
3e625e2d SH |
72 | { |
73 | struct stat statbuf; | |
74 | ||
75 | return stat(f, &statbuf) == 0; | |
76 | } | |
77 | ||
a41f104b SH |
78 | static bool config_file_exists(const char *lxcpath, const char *cname) |
79 | { | |
80 | /* $lxcpath + '/' + $cname + '/config' + \0 */ | |
81 | int ret, len = strlen(lxcpath) + strlen(cname) + 9; | |
82 | char *fname = alloca(len); | |
83 | ||
84 | ret = snprintf(fname, len, "%s/%s/config", lxcpath, cname); | |
85 | if (ret < 0 || ret >= len) | |
86 | return false; | |
87 | ||
88 | return file_exists(fname); | |
89 | } | |
90 | ||
3e625e2d SH |
91 | /* |
92 | * A few functions to help detect when a container creation failed. | |
93 | * If a container creation was killed partway through, then trying | |
94 | * to actually start that container could harm the host. We detect | |
95 | * this by creating a 'partial' file under the container directory, | |
96 | * and keeping an advisory lock. When container creation completes, | |
97 | * we remove that file. When we load or try to start a container, if | |
98 | * we find that file, without a flock, we remove the container. | |
99 | */ | |
100 | int ongoing_create(struct lxc_container *c) | |
101 | { | |
102 | int len = strlen(c->config_path) + strlen(c->name) + 10; | |
103 | char *path = alloca(len); | |
104 | int fd, ret; | |
93dc5327 SH |
105 | struct flock lk; |
106 | ||
3e625e2d SH |
107 | ret = snprintf(path, len, "%s/%s/partial", c->config_path, c->name); |
108 | if (ret < 0 || ret >= len) { | |
109 | ERROR("Error writing partial pathname"); | |
110 | return -1; | |
111 | } | |
112 | ||
113 | if (!file_exists(path)) | |
114 | return 0; | |
025ed0f3 SH |
115 | process_lock(); |
116 | fd = open(path, O_RDWR); | |
117 | process_unlock(); | |
118 | if (fd < 0) { | |
3e625e2d SH |
119 | // give benefit of the doubt |
120 | SYSERROR("Error opening partial file"); | |
3e625e2d SH |
121 | return 0; |
122 | } | |
93dc5327 SH |
123 | lk.l_type = F_WRLCK; |
124 | lk.l_whence = SEEK_SET; | |
125 | lk.l_start = 0; | |
126 | lk.l_len = 0; | |
127 | lk.l_pid = -1; | |
128 | if (fcntl(fd, F_GETLK, &lk) == 0 && lk.l_pid != -1) { | |
3e625e2d | 129 | // create is still ongoing |
025ed0f3 | 130 | process_lock(); |
3e625e2d SH |
131 | close(fd); |
132 | process_unlock(); | |
133 | return 1; | |
134 | } | |
135 | // create completed but partial is still there. | |
025ed0f3 | 136 | process_lock(); |
3e625e2d SH |
137 | close(fd); |
138 | process_unlock(); | |
139 | return 2; | |
140 | } | |
141 | ||
142 | int create_partial(struct lxc_container *c) | |
143 | { | |
144 | // $lxcpath + '/' + $name + '/partial' + \0 | |
145 | int len = strlen(c->config_path) + strlen(c->name) + 10; | |
146 | char *path = alloca(len); | |
147 | int fd, ret; | |
93dc5327 SH |
148 | struct flock lk; |
149 | ||
3e625e2d SH |
150 | ret = snprintf(path, len, "%s/%s/partial", c->config_path, c->name); |
151 | if (ret < 0 || ret >= len) { | |
152 | ERROR("Error writing partial pathname"); | |
153 | return -1; | |
154 | } | |
025ed0f3 | 155 | process_lock(); |
93dc5327 | 156 | if ((fd=open(path, O_RDWR | O_CREAT | O_EXCL, 0755)) < 0) { |
3e625e2d SH |
157 | SYSERROR("Erorr creating partial file"); |
158 | process_unlock(); | |
159 | return -1; | |
160 | } | |
93dc5327 SH |
161 | lk.l_type = F_WRLCK; |
162 | lk.l_whence = SEEK_SET; | |
163 | lk.l_start = 0; | |
164 | lk.l_len = 0; | |
165 | if (fcntl(fd, F_SETLKW, &lk) < 0) { | |
3e625e2d SH |
166 | SYSERROR("Error locking partial file %s", path); |
167 | close(fd); | |
168 | process_unlock(); | |
169 | return -1; | |
170 | } | |
171 | process_unlock(); | |
172 | ||
173 | return fd; | |
174 | } | |
175 | ||
176 | void remove_partial(struct lxc_container *c, int fd) | |
177 | { | |
178 | // $lxcpath + '/' + $name + '/partial' + \0 | |
179 | int len = strlen(c->config_path) + strlen(c->name) + 10; | |
180 | char *path = alloca(len); | |
181 | int ret; | |
182 | ||
025ed0f3 | 183 | process_lock(); |
3e625e2d | 184 | close(fd); |
025ed0f3 | 185 | process_unlock(); |
3e625e2d SH |
186 | ret = snprintf(path, len, "%s/%s/partial", c->config_path, c->name); |
187 | if (ret < 0 || ret >= len) { | |
188 | ERROR("Error writing partial pathname"); | |
189 | return; | |
190 | } | |
3e625e2d SH |
191 | if (unlink(path) < 0) |
192 | SYSERROR("Error unlink partial file %s", path); | |
3e625e2d SH |
193 | } |
194 | ||
72d0e1cb | 195 | /* LOCKING |
3bc449ed SH |
196 | * 1. container_mem_lock(c) protects the struct lxc_container from multiple threads. |
197 | * 2. container_disk_lock(c) protects the on-disk container data - in particular the | |
198 | * container configuration file. | |
199 | * The container_disk_lock also takes the container_mem_lock. | |
200 | * 3. thread_mutex protects process data (ex: fd table) from multiple threads. | |
72d0e1cb SG |
201 | * NOTHING mutexes two independent programs with their own struct |
202 | * lxc_container for the same c->name, between API calls. For instance, | |
203 | * c->config_read(); c->start(); Between those calls, data on disk | |
204 | * could change (which shouldn't bother the caller unless for instance | |
205 | * the rootfs get moved). c->config_read(); update; c->config_write(); | |
206 | * Two such updaters could race. The callers should therefore check their | |
207 | * results. Trying to prevent that would necessarily expose us to deadlocks | |
208 | * due to hung callers. So I prefer to keep the locks only within our own | |
209 | * functions, not across functions. | |
210 | * | |
3bc449ed | 211 | * If you're going to clone while holding a lxccontainer, increment |
72d0e1cb SG |
212 | * c->numthreads (under privlock) before forking. When deleting, |
213 | * decrement numthreads under privlock, then if it hits 0 you can delete. | |
214 | * Do not ever use a lxccontainer whose numthreads you did not bump. | |
215 | */ | |
216 | ||
217 | static void lxc_container_free(struct lxc_container *c) | |
218 | { | |
219 | if (!c) | |
220 | return; | |
221 | ||
222 | if (c->configfile) { | |
223 | free(c->configfile); | |
224 | c->configfile = NULL; | |
225 | } | |
226 | if (c->error_string) { | |
227 | free(c->error_string); | |
228 | c->error_string = NULL; | |
229 | } | |
d95db067 | 230 | if (c->slock) { |
df271a59 | 231 | lxc_putlock(c->slock); |
d95db067 DE |
232 | c->slock = NULL; |
233 | } | |
72d0e1cb | 234 | if (c->privlock) { |
df271a59 | 235 | lxc_putlock(c->privlock); |
72d0e1cb SG |
236 | c->privlock = NULL; |
237 | } | |
238 | if (c->name) { | |
239 | free(c->name); | |
240 | c->name = NULL; | |
241 | } | |
d95db067 DE |
242 | if (c->lxc_conf) { |
243 | lxc_conf_free(c->lxc_conf); | |
244 | c->lxc_conf = NULL; | |
245 | } | |
2a59a681 SH |
246 | if (c->config_path) { |
247 | free(c->config_path); | |
248 | c->config_path = NULL; | |
249 | } | |
72d0e1cb SG |
250 | free(c); |
251 | } | |
252 | ||
43d1aa34 SH |
253 | /* |
254 | * Consider the following case: | |
255 | freer | racing get()er | |
256 | ================================================================== | |
257 | lxc_container_put() | lxc_container_get() | |
258 | \ lxclock(c->privlock) | c->numthreads < 1? (no) | |
259 | \ c->numthreads = 0 | \ lxclock(c->privlock) -> waits | |
260 | \ lxcunlock() | \ | |
261 | \ lxc_container_free() | \ lxclock() returns | |
262 | | \ c->numthreads < 1 -> return 0 | |
263 | \ \ (free stuff) | | |
264 | \ \ sem_destroy(privlock) | | |
265 | ||
266 | * When the get()er checks numthreads the first time, one of the following | |
267 | * is true: | |
268 | * 1. freer has set numthreads = 0. get() returns 0 | |
269 | * 2. freer is between lxclock and setting numthreads to 0. get()er will | |
270 | * sem_wait on privlock, get lxclock after freer() drops it, then see | |
271 | * numthreads is 0 and exit without touching lxclock again.. | |
272 | * 3. freer has not yet locked privlock. If get()er runs first, then put()er | |
273 | * will see --numthreads = 1 and not call lxc_container_free(). | |
274 | */ | |
275 | ||
72d0e1cb SG |
276 | int lxc_container_get(struct lxc_container *c) |
277 | { | |
278 | if (!c) | |
279 | return 0; | |
280 | ||
43d1aa34 SH |
281 | // if someone else has already started freeing the container, don't |
282 | // try to take the lock, which may be invalid | |
283 | if (c->numthreads < 1) | |
284 | return 0; | |
285 | ||
5cee8c50 | 286 | if (container_mem_lock(c)) |
72d0e1cb SG |
287 | return 0; |
288 | if (c->numthreads < 1) { | |
289 | // bail without trying to unlock, bc the privlock is now probably | |
290 | // in freed memory | |
291 | return 0; | |
292 | } | |
293 | c->numthreads++; | |
5cee8c50 | 294 | container_mem_unlock(c); |
72d0e1cb SG |
295 | return 1; |
296 | } | |
297 | ||
298 | int lxc_container_put(struct lxc_container *c) | |
299 | { | |
300 | if (!c) | |
301 | return -1; | |
5cee8c50 | 302 | if (container_mem_lock(c)) |
72d0e1cb SG |
303 | return -1; |
304 | if (--c->numthreads < 1) { | |
5cee8c50 | 305 | container_mem_unlock(c); |
72d0e1cb SG |
306 | lxc_container_free(c); |
307 | return 1; | |
308 | } | |
5cee8c50 | 309 | container_mem_unlock(c); |
72d0e1cb SG |
310 | return 0; |
311 | } | |
312 | ||
72d0e1cb SG |
313 | static bool lxcapi_is_defined(struct lxc_container *c) |
314 | { | |
315 | struct stat statbuf; | |
316 | bool ret = false; | |
317 | int statret; | |
318 | ||
319 | if (!c) | |
320 | return false; | |
321 | ||
5cee8c50 | 322 | if (container_mem_lock(c)) |
72d0e1cb SG |
323 | return false; |
324 | if (!c->configfile) | |
325 | goto out; | |
326 | statret = stat(c->configfile, &statbuf); | |
327 | if (statret != 0) | |
328 | goto out; | |
329 | ret = true; | |
330 | ||
331 | out: | |
5cee8c50 | 332 | container_mem_unlock(c); |
72d0e1cb SG |
333 | return ret; |
334 | } | |
335 | ||
336 | static const char *lxcapi_state(struct lxc_container *c) | |
337 | { | |
72d0e1cb SG |
338 | lxc_state_t s; |
339 | ||
340 | if (!c) | |
341 | return NULL; | |
13f5be62 | 342 | s = lxc_getstate(c->name, c->config_path); |
39dc698c | 343 | return lxc_state2str(s); |
72d0e1cb SG |
344 | } |
345 | ||
39dc698c | 346 | static bool is_stopped(struct lxc_container *c) |
794dd120 SH |
347 | { |
348 | lxc_state_t s; | |
13f5be62 | 349 | s = lxc_getstate(c->name, c->config_path); |
794dd120 SH |
350 | return (s == STOPPED); |
351 | } | |
352 | ||
72d0e1cb SG |
353 | static bool lxcapi_is_running(struct lxc_container *c) |
354 | { | |
355 | const char *s; | |
356 | ||
357 | if (!c) | |
358 | return false; | |
359 | s = lxcapi_state(c); | |
360 | if (!s || strcmp(s, "STOPPED") == 0) | |
361 | return false; | |
362 | return true; | |
363 | } | |
364 | ||
365 | static bool lxcapi_freeze(struct lxc_container *c) | |
366 | { | |
367 | int ret; | |
368 | if (!c) | |
369 | return false; | |
370 | ||
9123e471 | 371 | ret = lxc_freeze(c->name, c->config_path); |
72d0e1cb SG |
372 | if (ret) |
373 | return false; | |
374 | return true; | |
375 | } | |
376 | ||
377 | static bool lxcapi_unfreeze(struct lxc_container *c) | |
378 | { | |
379 | int ret; | |
380 | if (!c) | |
381 | return false; | |
382 | ||
9123e471 | 383 | ret = lxc_unfreeze(c->name, c->config_path); |
72d0e1cb SG |
384 | if (ret) |
385 | return false; | |
386 | return true; | |
387 | } | |
388 | ||
b5159817 | 389 | static int lxcapi_console_getfd(struct lxc_container *c, int *ttynum, int *masterfd) |
0115f8fd DE |
390 | { |
391 | int ttyfd; | |
392 | if (!c) | |
393 | return -1; | |
394 | ||
b5159817 | 395 | ttyfd = lxc_console_getfd(c, ttynum, masterfd); |
0115f8fd DE |
396 | return ttyfd; |
397 | } | |
398 | ||
b5159817 DE |
399 | static int lxcapi_console(struct lxc_container *c, int ttynum, int stdinfd, |
400 | int stdoutfd, int stderrfd, int escape) | |
401 | { | |
402 | return lxc_console(c, ttynum, stdinfd, stdoutfd, stderrfd, escape); | |
403 | } | |
404 | ||
72d0e1cb SG |
405 | static pid_t lxcapi_init_pid(struct lxc_container *c) |
406 | { | |
72d0e1cb SG |
407 | if (!c) |
408 | return -1; | |
409 | ||
5cee8c50 | 410 | return lxc_cmd_get_init_pid(c->name, c->config_path); |
72d0e1cb SG |
411 | } |
412 | ||
12a50cc6 | 413 | static bool load_config_locked(struct lxc_container *c, const char *fname) |
8eb5694b SH |
414 | { |
415 | if (!c->lxc_conf) | |
416 | c->lxc_conf = lxc_conf_init(); | |
417 | if (c->lxc_conf && !lxc_config_read(fname, c->lxc_conf)) | |
418 | return true; | |
419 | return false; | |
420 | } | |
421 | ||
12a50cc6 | 422 | static bool lxcapi_load_config(struct lxc_container *c, const char *alt_file) |
72d0e1cb | 423 | { |
39dc698c SH |
424 | bool ret = false, need_disklock = false; |
425 | int lret; | |
12a50cc6 | 426 | const char *fname; |
72d0e1cb SG |
427 | if (!c) |
428 | return false; | |
429 | ||
430 | fname = c->configfile; | |
431 | if (alt_file) | |
432 | fname = alt_file; | |
433 | if (!fname) | |
434 | return false; | |
39dc698c SH |
435 | /* |
436 | * If we're reading something other than the container's config, | |
437 | * we only need to lock the in-memory container. If loading the | |
438 | * container's config file, take the disk lock. | |
439 | */ | |
440 | if (strcmp(fname, c->configfile) == 0) | |
441 | need_disklock = true; | |
442 | ||
443 | if (need_disklock) | |
444 | lret = container_disk_lock(c); | |
445 | else | |
446 | lret = container_mem_lock(c); | |
447 | if (lret) | |
72d0e1cb | 448 | return false; |
39dc698c | 449 | |
8eb5694b | 450 | ret = load_config_locked(c, fname); |
39dc698c SH |
451 | |
452 | if (need_disklock) | |
453 | container_disk_unlock(c); | |
454 | else | |
455 | container_mem_unlock(c); | |
72d0e1cb SG |
456 | return ret; |
457 | } | |
458 | ||
540f932a | 459 | static bool lxcapi_want_daemonize(struct lxc_container *c, bool state) |
72d0e1cb | 460 | { |
497a2995 | 461 | if (!c || !c->lxc_conf) |
540f932a | 462 | return false; |
f02abefe | 463 | if (container_mem_lock(c)) { |
3bc449ed | 464 | ERROR("Error getting mem lock"); |
540f932a | 465 | return false; |
3bc449ed | 466 | } |
540f932a | 467 | c->daemonize = state; |
83758ed0 | 468 | /* daemonize implies close_all_fds so set it */ |
540f932a SG |
469 | if (state == 1) |
470 | c->lxc_conf->close_all_fds = 1; | |
3bc449ed | 471 | container_mem_unlock(c); |
540f932a | 472 | return true; |
72d0e1cb SG |
473 | } |
474 | ||
540f932a | 475 | static bool lxcapi_want_close_all_fds(struct lxc_container *c, bool state) |
130a1888 ÇO |
476 | { |
477 | if (!c || !c->lxc_conf) | |
49badbbe | 478 | return false; |
130a1888 ÇO |
479 | if (container_mem_lock(c)) { |
480 | ERROR("Error getting mem lock"); | |
49badbbe | 481 | return false; |
130a1888 | 482 | } |
540f932a | 483 | c->lxc_conf->close_all_fds = state; |
130a1888 | 484 | container_mem_unlock(c); |
49badbbe | 485 | return true; |
130a1888 ÇO |
486 | } |
487 | ||
12a50cc6 | 488 | static bool lxcapi_wait(struct lxc_container *c, const char *state, int timeout) |
7a44c8b4 SG |
489 | { |
490 | int ret; | |
491 | ||
492 | if (!c) | |
493 | return false; | |
494 | ||
67e571de | 495 | ret = lxc_wait(c->name, state, timeout, c->config_path); |
7a44c8b4 SG |
496 | return ret == 0; |
497 | } | |
498 | ||
499 | ||
03f064ff | 500 | static bool wait_on_daemonized_start(struct lxc_container *c, int pid) |
7a44c8b4 SG |
501 | { |
502 | /* we'll probably want to make this timeout configurable? */ | |
697fa639 | 503 | int timeout = 5, ret, status; |
7a44c8b4 | 504 | |
697fa639 SH |
505 | /* |
506 | * our child is going to fork again, then exit. reap the | |
507 | * child | |
508 | */ | |
03f064ff | 509 | ret = waitpid(pid, &status, 0); |
697fa639 SH |
510 | if (ret == -1 || !WIFEXITED(status) || WEXITSTATUS(status) != 0) |
511 | DEBUG("failed waiting for first dual-fork child"); | |
7a44c8b4 SG |
512 | return lxcapi_wait(c, "RUNNING", timeout); |
513 | } | |
514 | ||
2d834aa8 SH |
515 | static bool am_single_threaded(void) |
516 | { | |
517 | struct dirent dirent, *direntp; | |
518 | DIR *dir; | |
519 | int count=0; | |
520 | ||
521 | process_lock(); | |
522 | dir = opendir("/proc/self/task"); | |
523 | process_unlock(); | |
524 | if (!dir) { | |
525 | INFO("failed to open /proc/self/task"); | |
526 | return false; | |
527 | } | |
528 | ||
529 | while (!readdir_r(dir, &dirent, &direntp)) { | |
530 | if (!direntp) | |
531 | break; | |
532 | ||
533 | if (!strcmp(direntp->d_name, ".")) | |
534 | continue; | |
535 | ||
536 | if (!strcmp(direntp->d_name, "..")) | |
537 | continue; | |
538 | if (++count > 1) | |
539 | break; | |
540 | } | |
541 | process_lock(); | |
542 | closedir(dir); | |
543 | process_unlock(); | |
544 | return count == 1; | |
545 | } | |
546 | ||
72d0e1cb SG |
547 | /* |
548 | * I can't decide if it'd be more convenient for callers if we accept '...', | |
549 | * or a null-terminated array (i.e. execl vs execv) | |
550 | */ | |
12a50cc6 | 551 | static bool lxcapi_start(struct lxc_container *c, int useinit, char * const argv[]) |
72d0e1cb SG |
552 | { |
553 | int ret; | |
554 | struct lxc_conf *conf; | |
540f932a | 555 | bool daemonize = false; |
72d0e1cb SG |
556 | char *default_args[] = { |
557 | "/sbin/init", | |
558 | '\0', | |
559 | }; | |
560 | ||
561 | /* container exists */ | |
562 | if (!c) | |
563 | return false; | |
564 | /* container has been setup */ | |
565 | if (!c->lxc_conf) | |
566 | return false; | |
567 | ||
3e625e2d SH |
568 | if ((ret = ongoing_create(c)) < 0) { |
569 | ERROR("Error checking for incomplete creation"); | |
570 | return false; | |
571 | } | |
572 | if (ret == 2) { | |
573 | ERROR("Error: %s creation was not completed", c->name); | |
574 | c->destroy(c); | |
575 | return false; | |
576 | } else if (ret == 1) { | |
577 | ERROR("Error: creation of %s is ongoing", c->name); | |
578 | return false; | |
579 | } | |
580 | ||
72d0e1cb SG |
581 | /* is this app meant to be run through lxcinit, as in lxc-execute? */ |
582 | if (useinit && !argv) | |
583 | return false; | |
584 | ||
5cee8c50 | 585 | if (container_mem_lock(c)) |
72d0e1cb SG |
586 | return false; |
587 | conf = c->lxc_conf; | |
588 | daemonize = c->daemonize; | |
5cee8c50 | 589 | container_mem_unlock(c); |
72d0e1cb SG |
590 | |
591 | if (useinit) { | |
13f5be62 | 592 | ret = lxc_execute(c->name, argv, 1, conf, c->config_path); |
72d0e1cb SG |
593 | return ret == 0 ? true : false; |
594 | } | |
595 | ||
596 | if (!argv) | |
597 | argv = default_args; | |
598 | ||
599 | /* | |
600 | * say, I'm not sure - what locks do we want here? Any? | |
601 | * Is liblxc's locking enough here to protect the on disk | |
602 | * container? We don't want to exclude things like lxc_info | |
603 | * while container is running... | |
604 | */ | |
605 | if (daemonize) { | |
606 | if (!lxc_container_get(c)) | |
607 | return false; | |
e51d4895 | 608 | lxc_monitord_spawn(c->config_path); |
71454076 | 609 | |
72d0e1cb SG |
610 | pid_t pid = fork(); |
611 | if (pid < 0) { | |
612 | lxc_container_put(c); | |
613 | return false; | |
614 | } | |
025ed0f3 | 615 | if (pid != 0) |
03f064ff | 616 | return wait_on_daemonized_start(c, pid); |
025ed0f3 SH |
617 | |
618 | process_unlock(); // we're no longer sharing | |
697fa639 SH |
619 | /* second fork to be reparented by init */ |
620 | pid = fork(); | |
621 | if (pid < 0) { | |
622 | SYSERROR("Error doing dual-fork"); | |
623 | return false; | |
624 | } | |
625 | if (pid != 0) | |
626 | exit(0); | |
72d0e1cb | 627 | /* like daemon(), chdir to / and redirect 0,1,2 to /dev/null */ |
c278cef2 SH |
628 | if (chdir("/")) { |
629 | SYSERROR("Error chdir()ing to /."); | |
630 | return false; | |
631 | } | |
72d0e1cb SG |
632 | close(0); |
633 | close(1); | |
634 | close(2); | |
eddaaafd | 635 | open("/dev/zero", O_RDONLY); |
72d0e1cb SG |
636 | open("/dev/null", O_RDWR); |
637 | open("/dev/null", O_RDWR); | |
638 | setsid(); | |
2d834aa8 SH |
639 | } else { |
640 | if (!am_single_threaded()) { | |
641 | ERROR("Cannot start non-daemonized container when threaded"); | |
642 | return false; | |
643 | } | |
72d0e1cb SG |
644 | } |
645 | ||
72d0e1cb SG |
646 | reboot: |
647 | conf->reboot = 0; | |
13f5be62 | 648 | ret = lxc_start(c->name, argv, conf, c->config_path); |
72d0e1cb SG |
649 | |
650 | if (conf->reboot) { | |
651 | INFO("container requested reboot"); | |
652 | conf->reboot = 0; | |
72d0e1cb SG |
653 | goto reboot; |
654 | } | |
655 | ||
656 | if (daemonize) { | |
657 | lxc_container_put(c); | |
658 | exit (ret == 0 ? true : false); | |
659 | } else { | |
660 | return (ret == 0 ? true : false); | |
661 | } | |
662 | } | |
663 | ||
664 | /* | |
665 | * note there MUST be an ending NULL | |
666 | */ | |
667 | static bool lxcapi_startl(struct lxc_container *c, int useinit, ...) | |
668 | { | |
669 | va_list ap; | |
a0e93eeb | 670 | char **inargs = NULL; |
72d0e1cb SG |
671 | bool bret = false; |
672 | ||
673 | /* container exists */ | |
674 | if (!c) | |
675 | return false; | |
676 | ||
72d0e1cb | 677 | va_start(ap, useinit); |
a0e93eeb | 678 | inargs = lxc_va_arg_list_to_argv(ap, 0, 1); |
72d0e1cb SG |
679 | va_end(ap); |
680 | ||
a0e93eeb CS |
681 | if (!inargs) { |
682 | ERROR("Memory allocation error."); | |
683 | goto out; | |
72d0e1cb SG |
684 | } |
685 | ||
a0e93eeb CS |
686 | /* pass NULL if no arguments were supplied */ |
687 | bret = lxcapi_start(c, useinit, *inargs ? inargs : NULL); | |
72d0e1cb SG |
688 | |
689 | out: | |
690 | if (inargs) { | |
4e03ae57 DE |
691 | char **arg; |
692 | for (arg = inargs; *arg; arg++) | |
693 | free(*arg); | |
72d0e1cb SG |
694 | free(inargs); |
695 | } | |
696 | ||
697 | return bret; | |
698 | } | |
699 | ||
700 | static bool lxcapi_stop(struct lxc_container *c) | |
701 | { | |
702 | int ret; | |
703 | ||
704 | if (!c) | |
705 | return false; | |
706 | ||
ef6e34ee | 707 | ret = lxc_cmd_stop(c->name, c->config_path); |
72d0e1cb SG |
708 | |
709 | return ret == 0; | |
72d0e1cb SG |
710 | } |
711 | ||
72d0e1cb SG |
712 | /* |
713 | * create the standard expected container dir | |
714 | */ | |
715 | static bool create_container_dir(struct lxc_container *c) | |
716 | { | |
717 | char *s; | |
718 | int len, ret; | |
719 | ||
2a59a681 | 720 | len = strlen(c->config_path) + strlen(c->name) + 2; |
72d0e1cb SG |
721 | s = malloc(len); |
722 | if (!s) | |
723 | return false; | |
2a59a681 | 724 | ret = snprintf(s, len, "%s/%s", c->config_path, c->name); |
72d0e1cb SG |
725 | if (ret < 0 || ret >= len) { |
726 | free(s); | |
727 | return false; | |
728 | } | |
729 | ret = mkdir(s, 0755); | |
730 | if (ret) { | |
731 | if (errno == EEXIST) | |
732 | ret = 0; | |
733 | else | |
734 | SYSERROR("failed to create container path for %s\n", c->name); | |
735 | } | |
736 | free(s); | |
737 | return ret == 0; | |
738 | } | |
739 | ||
1897e3bc SH |
740 | static const char *lxcapi_get_config_path(struct lxc_container *c); |
741 | static bool lxcapi_set_config_item(struct lxc_container *c, const char *key, const char *v); | |
742 | ||
72d0e1cb | 743 | /* |
1897e3bc SH |
744 | * do_bdev_create: thin wrapper around bdev_create(). Like bdev_create(), |
745 | * it returns a mounted bdev on success, NULL on error. | |
72d0e1cb | 746 | */ |
1897e3bc SH |
747 | static struct bdev *do_bdev_create(struct lxc_container *c, const char *type, |
748 | struct bdev_specs *specs) | |
749 | { | |
750 | char *dest; | |
1897e3bc SH |
751 | size_t len; |
752 | struct bdev *bdev; | |
753 | int ret; | |
754 | ||
cd219ae6 SY |
755 | /* rootfs.path or lxcpath/lxcname/rootfs */ |
756 | if (c->lxc_conf->rootfs.path && access(c->lxc_conf->rootfs.path, F_OK) == 0) { | |
cf465fe4 SH |
757 | const char *rpath = c->lxc_conf->rootfs.path; |
758 | len = strlen(rpath) + 1; | |
cd219ae6 | 759 | dest = alloca(len); |
cf465fe4 | 760 | ret = snprintf(dest, len, "%s", rpath); |
cd219ae6 | 761 | } else { |
cf465fe4 | 762 | const char *lxcpath = lxcapi_get_config_path(c); |
cd219ae6 SY |
763 | len = strlen(c->name) + strlen(lxcpath) + 9; |
764 | dest = alloca(len); | |
765 | ret = snprintf(dest, len, "%s/%s/rootfs", lxcpath, c->name); | |
766 | } | |
1897e3bc SH |
767 | if (ret < 0 || ret >= len) |
768 | return NULL; | |
769 | ||
770 | bdev = bdev_create(dest, type, c->name, specs); | |
d44e88c2 SH |
771 | if (!bdev) { |
772 | ERROR("Failed to create backing store type %s\n", type); | |
1897e3bc | 773 | return NULL; |
d44e88c2 SH |
774 | } |
775 | ||
1897e3bc | 776 | lxcapi_set_config_item(c, "lxc.rootfs", bdev->src); |
cf3ef16d SH |
777 | |
778 | /* if we are not root, chown the rootfs dir to root in the | |
779 | * target uidmap */ | |
780 | ||
781 | if (geteuid() != 0) { | |
c4d10a05 SH |
782 | if (chown_mapped_root(bdev->dest, c->lxc_conf) < 0) { |
783 | ERROR("Error chowning %s to container root\n", bdev->dest); | |
cf3ef16d SH |
784 | bdev_put(bdev); |
785 | return NULL; | |
786 | } | |
787 | } | |
788 | ||
1897e3bc SH |
789 | return bdev; |
790 | } | |
791 | ||
cbee8106 SH |
792 | /* |
793 | * Given the '-t' template option to lxc-create, figure out what to | |
794 | * do. If the template is a full executable path, use that. If it | |
85db5535 DE |
795 | * is something like 'sshd', then return $templatepath/lxc-sshd. |
796 | * On success return the template, on error return NULL. | |
cbee8106 | 797 | */ |
85db5535 | 798 | static char *get_template_path(const char *t) |
cbee8106 SH |
799 | { |
800 | int ret, len; | |
801 | char *tpath; | |
802 | ||
cbee8106 SH |
803 | if (t[0] == '/' && access(t, X_OK) == 0) { |
804 | tpath = strdup(t); | |
cbee8106 SH |
805 | return tpath; |
806 | } | |
807 | ||
808 | len = strlen(LXCTEMPLATEDIR) + strlen(t) + strlen("/lxc-") + 1; | |
809 | tpath = malloc(len); | |
810 | if (!tpath) | |
85db5535 | 811 | return NULL; |
cbee8106 SH |
812 | ret = snprintf(tpath, len, "%s/lxc-%s", LXCTEMPLATEDIR, t); |
813 | if (ret < 0 || ret >= len) { | |
814 | free(tpath); | |
85db5535 | 815 | return NULL; |
cbee8106 SH |
816 | } |
817 | if (access(tpath, X_OK) < 0) { | |
818 | SYSERROR("bad template: %s\n", t); | |
819 | free(tpath); | |
85db5535 | 820 | return NULL; |
cbee8106 SH |
821 | } |
822 | ||
823 | return tpath; | |
824 | } | |
825 | ||
96b3cb40 | 826 | static char *lxcbasename(char *path) |
72d0e1cb | 827 | { |
96b3cb40 SH |
828 | char *p = path + strlen(path) - 1; |
829 | while (*p != '/' && p > path) | |
830 | p--; | |
831 | return p; | |
832 | } | |
72d0e1cb | 833 | |
dc23c1c8 | 834 | static bool create_run_template(struct lxc_container *c, char *tpath, bool quiet, |
96b3cb40 SH |
835 | char *const argv[]) |
836 | { | |
837 | pid_t pid; | |
72d0e1cb | 838 | |
72d0e1cb | 839 | if (!tpath) |
96b3cb40 | 840 | return true; |
72d0e1cb SG |
841 | |
842 | pid = fork(); | |
843 | if (pid < 0) { | |
844 | SYSERROR("failed to fork task for container creation template\n"); | |
96b3cb40 | 845 | return false; |
72d0e1cb SG |
846 | } |
847 | ||
848 | if (pid == 0) { // child | |
1897e3bc SH |
849 | char *patharg, *namearg, *rootfsarg, *src; |
850 | struct bdev *bdev = NULL; | |
72d0e1cb | 851 | int i; |
96b3cb40 SH |
852 | int ret, len, nargs = 0; |
853 | char **newargv; | |
cf3ef16d | 854 | struct lxc_conf *conf = c->lxc_conf; |
72d0e1cb | 855 | |
025ed0f3 | 856 | process_unlock(); // we're no longer sharing |
dc23c1c8 SH |
857 | if (quiet) { |
858 | close(0); | |
859 | close(1); | |
860 | close(2); | |
861 | open("/dev/zero", O_RDONLY); | |
862 | open("/dev/null", O_RDWR); | |
863 | open("/dev/null", O_RDWR); | |
864 | } | |
1897e3bc SH |
865 | |
866 | src = c->lxc_conf->rootfs.path; | |
867 | /* | |
868 | * for an overlayfs create, what the user wants is the template to fill | |
869 | * in what will become the readonly lower layer. So don't mount for | |
870 | * the template | |
871 | */ | |
872 | if (strncmp(src, "overlayfs:", 10) == 0) { | |
873 | src = overlayfs_getlower(src+10); | |
874 | } | |
875 | bdev = bdev_init(src, c->lxc_conf->rootfs.mount, NULL); | |
876 | if (!bdev) { | |
877 | ERROR("Error opening rootfs"); | |
878 | exit(1); | |
879 | } | |
880 | ||
4de2791f | 881 | if (geteuid() == 0) { |
cf3ef16d SH |
882 | if (unshare(CLONE_NEWNS) < 0) { |
883 | ERROR("error unsharing mounts"); | |
884 | exit(1); | |
885 | } | |
4de2791f SH |
886 | if (detect_shared_rootfs()) { |
887 | if (mount("", "", NULL, MS_SLAVE|MS_REC, 0)) { | |
888 | SYSERROR("Failed to make / rslave to run template"); | |
889 | ERROR("Continuing..."); | |
890 | } | |
891 | } | |
892 | } | |
893 | if (strcmp(bdev->type, "dir") != 0) { | |
894 | if (geteuid() != 0) { | |
895 | ERROR("non-root users can only create directory-backed containers"); | |
896 | exit(1); | |
897 | } | |
cf3ef16d SH |
898 | if (bdev->ops->mount(bdev) < 0) { |
899 | ERROR("Error mounting rootfs"); | |
900 | exit(1); | |
901 | } | |
902 | } else { // TODO come up with a better way here! | |
903 | if (bdev->dest) | |
904 | free(bdev->dest); | |
905 | bdev->dest = strdup(bdev->src); | |
1897e3bc SH |
906 | } |
907 | ||
72d0e1cb SG |
908 | /* |
909 | * create our new array, pre-pend the template name and | |
910 | * base args | |
911 | */ | |
912 | if (argv) | |
1897e3bc SH |
913 | for (nargs = 0; argv[nargs]; nargs++) ; |
914 | nargs += 4; // template, path, rootfs and name args | |
cf3ef16d | 915 | |
72d0e1cb SG |
916 | newargv = malloc(nargs * sizeof(*newargv)); |
917 | if (!newargv) | |
918 | exit(1); | |
96b3cb40 | 919 | newargv[0] = lxcbasename(tpath); |
72d0e1cb | 920 | |
2a59a681 | 921 | len = strlen(c->config_path) + strlen(c->name) + strlen("--path=") + 2; |
72d0e1cb SG |
922 | patharg = malloc(len); |
923 | if (!patharg) | |
924 | exit(1); | |
2a59a681 | 925 | ret = snprintf(patharg, len, "--path=%s/%s", c->config_path, c->name); |
72d0e1cb SG |
926 | if (ret < 0 || ret >= len) |
927 | exit(1); | |
928 | newargv[1] = patharg; | |
929 | len = strlen("--name=") + strlen(c->name) + 1; | |
930 | namearg = malloc(len); | |
931 | if (!namearg) | |
932 | exit(1); | |
933 | ret = snprintf(namearg, len, "--name=%s", c->name); | |
934 | if (ret < 0 || ret >= len) | |
935 | exit(1); | |
936 | newargv[2] = namearg; | |
937 | ||
1897e3bc SH |
938 | len = strlen("--rootfs=") + 1 + strlen(bdev->dest); |
939 | rootfsarg = malloc(len); | |
940 | if (!rootfsarg) | |
941 | exit(1); | |
942 | ret = snprintf(rootfsarg, len, "--rootfs=%s", bdev->dest); | |
943 | if (ret < 0 || ret >= len) | |
944 | exit(1); | |
945 | newargv[3] = rootfsarg; | |
946 | ||
72d0e1cb SG |
947 | /* add passed-in args */ |
948 | if (argv) | |
1897e3bc SH |
949 | for (i = 4; i < nargs; i++) |
950 | newargv[i] = argv[i-4]; | |
72d0e1cb SG |
951 | |
952 | /* add trailing NULL */ | |
953 | nargs++; | |
954 | newargv = realloc(newargv, nargs * sizeof(*newargv)); | |
955 | if (!newargv) | |
956 | exit(1); | |
957 | newargv[nargs - 1] = NULL; | |
958 | ||
cf3ef16d SH |
959 | /* |
960 | * If we're running the template in a mapped userns, then | |
961 | * we prepend the template command with: | |
962 | * lxc-usernsexec <-m map1> ... <-m mapn> -- | |
57d116ab SH |
963 | * and we append "--mapped-uid x", where x is the mapped uid |
964 | * for our geteuid() | |
cf3ef16d SH |
965 | */ |
966 | if (geteuid() != 0 && !lxc_list_empty(&conf->id_map)) { | |
967 | int n2args = 1; | |
57d116ab | 968 | char txtuid[20]; |
cf3ef16d SH |
969 | char **n2 = malloc(n2args * sizeof(*n2)); |
970 | struct lxc_list *it; | |
971 | struct id_map *map; | |
972 | ||
57d116ab SH |
973 | if (!n2) { |
974 | SYSERROR("out of memory"); | |
975 | exit(1); | |
976 | } | |
cf3ef16d SH |
977 | newargv[0] = tpath; |
978 | tpath = "lxc-usernsexec"; | |
979 | n2[0] = "lxc-usernsexec"; | |
980 | lxc_list_for_each(it, &conf->id_map) { | |
981 | map = it->elem; | |
982 | n2args += 2; | |
57d116ab | 983 | n2 = realloc(n2, n2args * sizeof(char *)); |
cf3ef16d SH |
984 | if (!n2) |
985 | exit(1); | |
986 | n2[n2args-2] = "-m"; | |
987 | n2[n2args-1] = malloc(200); | |
988 | if (!n2[n2args-1]) | |
989 | exit(1); | |
990 | ret = snprintf(n2[n2args-1], 200, "%c:%lu:%lu:%lu", | |
991 | map->idtype == ID_TYPE_UID ? 'u' : 'g', | |
992 | map->nsid, map->hostid, map->range); | |
993 | if (ret < 0 || ret >= 200) | |
994 | exit(1); | |
995 | } | |
57d116ab SH |
996 | int hostid_mapped = mapped_hostid(geteuid(), conf); |
997 | int extraargs = hostid_mapped >= 0 ? 1 : 3; | |
998 | n2 = realloc(n2, (nargs + n2args + extraargs) * sizeof(char *)); | |
cf3ef16d SH |
999 | if (!n2) |
1000 | exit(1); | |
57d116ab SH |
1001 | if (hostid_mapped < 0) { |
1002 | hostid_mapped = find_unmapped_nsuid(conf); | |
cf3ef16d | 1003 | n2[n2args++] = "-m"; |
57d116ab | 1004 | if (hostid_mapped < 0) { |
cf3ef16d SH |
1005 | ERROR("Could not find free uid to map"); |
1006 | exit(1); | |
1007 | } | |
1008 | n2[n2args++] = malloc(200); | |
1009 | if (!n2[n2args-1]) { | |
1010 | SYSERROR("out of memory"); | |
1011 | exit(1); | |
1012 | } | |
1013 | ret = snprintf(n2[n2args-1], 200, "u:%d:%d:1", | |
57d116ab | 1014 | hostid_mapped, geteuid()); |
cf3ef16d SH |
1015 | if (ret < 0 || ret >= 200) { |
1016 | ERROR("string too long"); | |
1017 | exit(1); | |
1018 | } | |
1019 | } | |
1020 | n2[n2args++] = "--"; | |
1021 | for (i = 0; i < nargs; i++) | |
1022 | n2[i + n2args] = newargv[i]; | |
57d116ab SH |
1023 | n2args += nargs; |
1024 | // Finally add "--mapped-uid $uid" to tell template what to chown | |
1025 | // cached images to | |
1026 | n2args += 2; | |
1027 | n2 = realloc(n2, n2args * sizeof(char *)); | |
1028 | if (!n2) { | |
1029 | SYSERROR("out of memory"); | |
1030 | exit(1); | |
1031 | } | |
1032 | // note n2[n2args-1] is NULL | |
1033 | n2[n2args-3] = "--mapped-uid"; | |
1034 | snprintf(txtuid, 20, "%d", hostid_mapped); | |
1035 | n2[n2args-2] = txtuid; | |
1036 | n2[n2args-1] = NULL; | |
cf3ef16d SH |
1037 | free(newargv); |
1038 | newargv = n2; | |
1039 | } | |
72d0e1cb | 1040 | /* execute */ |
cf3ef16d | 1041 | execvp(tpath, newargv); |
72d0e1cb SG |
1042 | SYSERROR("failed to execute template %s", tpath); |
1043 | exit(1); | |
1044 | } | |
1045 | ||
9be53773 SH |
1046 | if (wait_for_pid(pid) != 0) { |
1047 | ERROR("container creation template for %s failed\n", c->name); | |
96b3cb40 SH |
1048 | return false; |
1049 | } | |
1050 | ||
1051 | return true; | |
1052 | } | |
1053 | ||
3ce74686 SH |
1054 | bool prepend_lxc_header(char *path, const char *t, char *const argv[]) |
1055 | { | |
1fd9bd50 | 1056 | long flen; |
b4569e93 | 1057 | char *contents; |
3ce74686 | 1058 | FILE *f; |
025ed0f3 | 1059 | int ret = -1; |
52026772 | 1060 | #if HAVE_LIBGNUTLS |
025ed0f3 | 1061 | int i; |
3ce74686 | 1062 | unsigned char md_value[SHA_DIGEST_LENGTH]; |
b4569e93 | 1063 | char *tpath; |
52026772 | 1064 | #endif |
3ce74686 | 1065 | |
025ed0f3 SH |
1066 | process_lock(); |
1067 | f = fopen(path, "r"); | |
1068 | process_unlock(); | |
1069 | if (f == NULL) | |
3ce74686 | 1070 | return false; |
025ed0f3 SH |
1071 | |
1072 | if (fseek(f, 0, SEEK_END) < 0) | |
1073 | goto out_error; | |
1074 | if ((flen = ftell(f)) < 0) | |
1075 | goto out_error; | |
1076 | if (fseek(f, 0, SEEK_SET) < 0) | |
1077 | goto out_error; | |
1078 | if ((contents = malloc(flen + 1)) == NULL) | |
1079 | goto out_error; | |
1080 | if (fread(contents, 1, flen, f) != flen) | |
1081 | goto out_free_contents; | |
1082 | ||
3ce74686 | 1083 | contents[flen] = '\0'; |
025ed0f3 SH |
1084 | process_lock(); |
1085 | ret = fclose(f); | |
1086 | process_unlock(); | |
1087 | f = NULL; | |
1088 | if (ret < 0) | |
1089 | goto out_free_contents; | |
3ce74686 | 1090 | |
b4569e93 | 1091 | #if HAVE_LIBGNUTLS |
01efd4d3 | 1092 | tpath = get_template_path(t); |
85db5535 | 1093 | if (!tpath) { |
3ce74686 | 1094 | ERROR("bad template: %s\n", t); |
025ed0f3 | 1095 | goto out_free_contents; |
3ce74686 SH |
1096 | } |
1097 | ||
85db5535 DE |
1098 | ret = sha1sum_file(tpath, md_value); |
1099 | if (ret < 0) { | |
1100 | ERROR("Error getting sha1sum of %s", tpath); | |
3ce74686 | 1101 | free(tpath); |
85db5535 | 1102 | goto out_free_contents; |
3ce74686 | 1103 | } |
85db5535 | 1104 | free(tpath); |
3ce74686 SH |
1105 | #endif |
1106 | ||
025ed0f3 SH |
1107 | process_lock(); |
1108 | f = fopen(path, "w"); | |
1109 | process_unlock(); | |
1110 | if (f == NULL) { | |
3ce74686 SH |
1111 | SYSERROR("reopening config for writing"); |
1112 | free(contents); | |
1113 | return false; | |
1114 | } | |
1115 | fprintf(f, "# Template used to create this container: %s\n", t); | |
1116 | if (argv) { | |
1117 | fprintf(f, "# Parameters passed to the template:"); | |
1118 | while (*argv) { | |
1119 | fprintf(f, " %s", *argv); | |
1120 | argv++; | |
1121 | } | |
1122 | fprintf(f, "\n"); | |
1123 | } | |
1124 | #if HAVE_LIBGNUTLS | |
56698177 SH |
1125 | fprintf(f, "# Template script checksum (SHA-1): "); |
1126 | for (i=0; i<SHA_DIGEST_LENGTH; i++) | |
1127 | fprintf(f, "%02x", md_value[i]); | |
1128 | fprintf(f, "\n"); | |
3ce74686 | 1129 | #endif |
f2a95ee1 | 1130 | fprintf(f, "# For additional config options, please look at lxc.conf(5)\n"); |
3ce74686 SH |
1131 | if (fwrite(contents, 1, flen, f) != flen) { |
1132 | SYSERROR("Writing original contents"); | |
1133 | free(contents); | |
025ed0f3 | 1134 | process_lock(); |
3ce74686 | 1135 | fclose(f); |
025ed0f3 | 1136 | process_unlock(); |
3ce74686 SH |
1137 | return false; |
1138 | } | |
025ed0f3 SH |
1139 | ret = 0; |
1140 | out_free_contents: | |
3ce74686 | 1141 | free(contents); |
025ed0f3 SH |
1142 | out_error: |
1143 | if (f) { | |
1144 | int newret; | |
1145 | process_lock(); | |
1146 | newret = fclose(f); | |
1147 | process_unlock(); | |
1148 | if (ret == 0) | |
1149 | ret = newret; | |
1150 | } | |
1151 | if (ret < 0) { | |
1152 | SYSERROR("Error prepending header"); | |
3ce74686 SH |
1153 | return false; |
1154 | } | |
1155 | return true; | |
1156 | } | |
1157 | ||
4df7f012 SH |
1158 | static void lxcapi_clear_config(struct lxc_container *c) |
1159 | { | |
1160 | if (c && c->lxc_conf) { | |
1161 | lxc_conf_free(c->lxc_conf); | |
1162 | c->lxc_conf = NULL; | |
1163 | } | |
1164 | } | |
1165 | ||
96b3cb40 SH |
1166 | static bool lxcapi_destroy(struct lxc_container *c); |
1167 | /* | |
1168 | * lxcapi_create: | |
1169 | * create a container with the given parameters. | |
1170 | * @c: container to be created. It has the lxcpath, name, and a starting | |
1171 | * configuration already set | |
1172 | * @t: the template to execute to instantiate the root filesystem and | |
1173 | * adjust the configuration. | |
1174 | * @bdevtype: backing store type to use. If NULL, dir will be used. | |
1175 | * @specs: additional parameters for the backing store, i.e. LVM vg to | |
1176 | * use. | |
1177 | * | |
1178 | * @argv: the arguments to pass to the template, terminated by NULL. If no | |
1179 | * arguments, you can just pass NULL. | |
1180 | */ | |
1181 | static bool lxcapi_create(struct lxc_container *c, const char *t, | |
dc23c1c8 | 1182 | const char *bdevtype, struct bdev_specs *specs, int flags, |
96b3cb40 SH |
1183 | char *const argv[]) |
1184 | { | |
a69aad27 | 1185 | bool ret = false; |
96b3cb40 | 1186 | pid_t pid; |
85db5535 | 1187 | char *tpath = NULL; |
cbee8106 | 1188 | int partial_fd; |
96b3cb40 SH |
1189 | |
1190 | if (!c) | |
1191 | return false; | |
1192 | ||
85db5535 DE |
1193 | if (t) { |
1194 | tpath = get_template_path(t); | |
1195 | if (!tpath) { | |
1196 | ERROR("bad template: %s\n", t); | |
1197 | goto out; | |
1198 | } | |
96b3cb40 SH |
1199 | } |
1200 | ||
cf465fe4 SH |
1201 | /* |
1202 | * If a template is passed in, and the rootfs already is defined in | |
1203 | * the container config and exists, then * caller is trying to create | |
1204 | * an existing container. Return an error, but do NOT delete the | |
1205 | * container. | |
1206 | */ | |
1207 | if (lxcapi_is_defined(c) && c->lxc_conf && c->lxc_conf->rootfs.path && | |
1208 | access(c->lxc_conf->rootfs.path, F_OK) == 0 && tpath) { | |
1209 | ERROR("Container %s:%s already exists", c->config_path, c->name); | |
6c6892b5 | 1210 | goto free_tpath; |
cf465fe4 SH |
1211 | } |
1212 | ||
6c6892b5 DE |
1213 | if (!c->lxc_conf) { |
1214 | if (!c->load_config(c, LXC_DEFAULT_CONFIG)) { | |
1215 | ERROR("Error loading default configuration file %s\n", LXC_DEFAULT_CONFIG); | |
1216 | goto free_tpath; | |
1217 | } | |
96b3cb40 SH |
1218 | } |
1219 | ||
6c6892b5 DE |
1220 | if (!create_container_dir(c)) |
1221 | goto free_tpath; | |
1222 | ||
0590e82c SH |
1223 | /* |
1224 | * either template or rootfs.path should be set. | |
1225 | * if both template and rootfs.path are set, template is setup as rootfs.path. | |
1226 | * container is already created if we have a config and rootfs.path is accessible | |
1227 | */ | |
1228 | if (!c->lxc_conf->rootfs.path && !tpath) | |
1229 | /* no template passed in and rootfs does not exist: error */ | |
1230 | goto out; | |
1231 | if (c->lxc_conf->rootfs.path && access(c->lxc_conf->rootfs.path, F_OK) != 0) | |
1232 | /* rootfs passed into configuration, but does not exist: error */ | |
1233 | goto out; | |
1234 | if (lxcapi_is_defined(c) && c->lxc_conf->rootfs.path && !tpath) { | |
1235 | /* Rootfs already existed, user just wanted to save the | |
1236 | * loaded configuration */ | |
1237 | ret = true; | |
1238 | goto out; | |
a69aad27 | 1239 | } |
96b3cb40 SH |
1240 | |
1241 | /* Mark that this container is being created */ | |
1242 | if ((partial_fd = create_partial(c)) < 0) | |
1243 | goto out; | |
1244 | ||
1245 | /* no need to get disk lock bc we have the partial locked */ | |
1246 | ||
1247 | /* | |
1248 | * Create the backing store | |
1249 | * Note we can't do this in the same task as we use to execute the | |
1250 | * template because of the way zfs works. | |
1251 | * After you 'zfs create', zfs mounts the fs only in the initial | |
1252 | * namespace. | |
1253 | */ | |
1254 | pid = fork(); | |
1255 | if (pid < 0) { | |
1256 | SYSERROR("failed to fork task for container creation template\n"); | |
8eb5694b SH |
1257 | goto out_unlock; |
1258 | } | |
1259 | ||
96b3cb40 SH |
1260 | if (pid == 0) { // child |
1261 | struct bdev *bdev = NULL; | |
1262 | ||
025ed0f3 | 1263 | process_unlock(); // we're no longer sharing |
96b3cb40 SH |
1264 | if (!(bdev = do_bdev_create(c, bdevtype, specs))) { |
1265 | ERROR("Error creating backing store type %s for %s", | |
1266 | bdevtype ? bdevtype : "(none)", c->name); | |
1267 | exit(1); | |
1268 | } | |
1269 | ||
1270 | /* save config file again to store the new rootfs location */ | |
1271 | if (!c->save_config(c, NULL)) { | |
1272 | ERROR("failed to save starting configuration for %s\n", c->name); | |
1273 | // parent task won't see bdev in config so we delete it | |
1274 | bdev->ops->umount(bdev); | |
1275 | bdev->ops->destroy(bdev); | |
1276 | exit(1); | |
1277 | } | |
1278 | exit(0); | |
1279 | } | |
1280 | if (wait_for_pid(pid) != 0) | |
a09295f8 | 1281 | goto out_unlock; |
96b3cb40 SH |
1282 | |
1283 | /* reload config to get the rootfs */ | |
a3b47c09 | 1284 | lxc_conf_free(c->lxc_conf); |
96b3cb40 SH |
1285 | c->lxc_conf = NULL; |
1286 | if (!load_config_locked(c, c->configfile)) | |
a09295f8 | 1287 | goto out_unlock; |
96b3cb40 | 1288 | |
dc23c1c8 | 1289 | if (!create_run_template(c, tpath, !!(flags & LXC_CREATE_QUIET), argv)) |
96b3cb40 SH |
1290 | goto out_unlock; |
1291 | ||
8eb5694b SH |
1292 | // now clear out the lxc_conf we have, reload from the created |
1293 | // container | |
4df7f012 | 1294 | lxcapi_clear_config(c); |
3ce74686 | 1295 | |
9d65a487 KY |
1296 | if (t) { |
1297 | if (!prepend_lxc_header(c->configfile, tpath, argv)) { | |
1298 | ERROR("Error prepending header to configuration file"); | |
1299 | goto out_unlock; | |
1300 | } | |
3ce74686 | 1301 | } |
a69aad27 | 1302 | ret = load_config_locked(c, c->configfile); |
72d0e1cb SG |
1303 | |
1304 | out_unlock: | |
3e625e2d SH |
1305 | if (partial_fd >= 0) |
1306 | remove_partial(c, partial_fd); | |
72d0e1cb | 1307 | out: |
a69aad27 | 1308 | if (!ret && c) |
1897e3bc | 1309 | lxcapi_destroy(c); |
6c6892b5 DE |
1310 | free_tpath: |
1311 | if (tpath) | |
1312 | free(tpath); | |
a69aad27 | 1313 | return ret; |
72d0e1cb SG |
1314 | } |
1315 | ||
3e625e2d SH |
1316 | static bool lxcapi_reboot(struct lxc_container *c) |
1317 | { | |
1318 | pid_t pid; | |
1319 | ||
1320 | if (!c) | |
1321 | return false; | |
1322 | if (!c->is_running(c)) | |
1323 | return false; | |
1324 | pid = c->init_pid(c); | |
1325 | if (pid <= 0) | |
1326 | return false; | |
1327 | if (kill(pid, SIGINT) < 0) | |
1328 | return false; | |
1329 | return true; | |
1330 | ||
1331 | } | |
1332 | ||
72d0e1cb SG |
1333 | static bool lxcapi_shutdown(struct lxc_container *c, int timeout) |
1334 | { | |
1335 | bool retv; | |
1336 | pid_t pid; | |
1337 | ||
1338 | if (!c) | |
1339 | return false; | |
1340 | ||
1341 | if (!timeout) | |
1342 | timeout = -1; | |
1343 | if (!c->is_running(c)) | |
1344 | return true; | |
1345 | pid = c->init_pid(c); | |
1346 | if (pid <= 0) | |
1347 | return true; | |
1348 | kill(pid, SIGPWR); | |
1349 | retv = c->wait(c, "STOPPED", timeout); | |
f6144ed4 | 1350 | if (!retv && timeout > 0) { |
72d0e1cb SG |
1351 | c->stop(c); |
1352 | retv = c->wait(c, "STOPPED", 0); // 0 means don't wait | |
1353 | } | |
1354 | return retv; | |
1355 | } | |
1356 | ||
1897e3bc | 1357 | static bool lxcapi_createl(struct lxc_container *c, const char *t, |
dc23c1c8 | 1358 | const char *bdevtype, struct bdev_specs *specs, int flags, ...) |
72d0e1cb SG |
1359 | { |
1360 | bool bret = false; | |
a0e93eeb | 1361 | char **args = NULL; |
72d0e1cb | 1362 | va_list ap; |
72d0e1cb SG |
1363 | |
1364 | if (!c) | |
1365 | return false; | |
1366 | ||
1367 | /* | |
1368 | * since we're going to wait for create to finish, I don't think we | |
1369 | * need to get a copy of the arguments. | |
1370 | */ | |
dc23c1c8 | 1371 | va_start(ap, flags); |
a0e93eeb | 1372 | args = lxc_va_arg_list_to_argv(ap, 0, 0); |
72d0e1cb | 1373 | va_end(ap); |
a0e93eeb CS |
1374 | if (!args) { |
1375 | ERROR("Memory allocation error."); | |
1376 | goto out; | |
1377 | } | |
72d0e1cb | 1378 | |
dc23c1c8 | 1379 | bret = c->create(c, t, bdevtype, specs, flags, args); |
72d0e1cb SG |
1380 | |
1381 | out: | |
a0e93eeb | 1382 | free(args); |
72d0e1cb SG |
1383 | return bret; |
1384 | } | |
1385 | ||
12a50cc6 | 1386 | static bool lxcapi_clear_config_item(struct lxc_container *c, const char *key) |
72d0e1cb SG |
1387 | { |
1388 | int ret; | |
1389 | ||
1390 | if (!c || !c->lxc_conf) | |
1391 | return false; | |
5cee8c50 | 1392 | if (container_mem_lock(c)) |
72d0e1cb | 1393 | return false; |
72d0e1cb | 1394 | ret = lxc_clear_config_item(c->lxc_conf, key); |
5cee8c50 | 1395 | container_mem_unlock(c); |
72d0e1cb SG |
1396 | return ret == 0; |
1397 | } | |
1398 | ||
799f29ab ÇO |
1399 | static inline void exit_from_ns(struct lxc_container *c, int *old_netns, int *new_netns) { |
1400 | /* Switch back to original netns */ | |
1401 | if (*old_netns >= 0 && setns(*old_netns, CLONE_NEWNET)) | |
1402 | SYSERROR("failed to setns"); | |
1403 | process_lock(); | |
1404 | if (*new_netns >= 0) | |
1405 | close(*new_netns); | |
1406 | if (*old_netns >= 0) | |
1407 | close(*old_netns); | |
1408 | process_unlock(); | |
1409 | } | |
1410 | ||
1411 | static inline bool enter_to_ns(struct lxc_container *c, int *old_netns, int *new_netns) { | |
1412 | int ret = 0; | |
9c83a661 | 1413 | char new_netns_path[MAXPATHLEN]; |
9c83a661 SG |
1414 | |
1415 | if (!c->is_running(c)) | |
1416 | goto out; | |
1417 | ||
1418 | /* Save reference to old netns */ | |
025ed0f3 | 1419 | process_lock(); |
799f29ab | 1420 | *old_netns = open("/proc/self/ns/net", O_RDONLY); |
025ed0f3 | 1421 | process_unlock(); |
799f29ab | 1422 | if (*old_netns < 0) { |
9c83a661 SG |
1423 | SYSERROR("failed to open /proc/self/ns/net"); |
1424 | goto out; | |
1425 | } | |
1426 | ||
1427 | /* Switch to new netns */ | |
1428 | ret = snprintf(new_netns_path, MAXPATHLEN, "/proc/%d/ns/net", c->init_pid(c)); | |
1429 | if (ret < 0 || ret >= MAXPATHLEN) | |
1430 | goto out; | |
1431 | ||
025ed0f3 | 1432 | process_lock(); |
799f29ab | 1433 | *new_netns = open(new_netns_path, O_RDONLY); |
025ed0f3 | 1434 | process_unlock(); |
799f29ab | 1435 | if (*new_netns < 0) { |
9c83a661 SG |
1436 | SYSERROR("failed to open %s", new_netns_path); |
1437 | goto out; | |
1438 | } | |
1439 | ||
799f29ab | 1440 | if (setns(*new_netns, CLONE_NEWNET)) { |
9c83a661 SG |
1441 | SYSERROR("failed to setns"); |
1442 | goto out; | |
1443 | } | |
799f29ab ÇO |
1444 | return true; |
1445 | out: | |
1446 | exit_from_ns(c, old_netns, new_netns); | |
1447 | return false; | |
1448 | } | |
1449 | ||
9c88ff1f ÇO |
1450 | // used by qsort and bsearch functions for comparing names |
1451 | static inline int string_cmp(char **first, char **second) | |
1452 | { | |
1453 | return strcmp(*first, *second); | |
1454 | } | |
1455 | ||
1456 | // used by qsort and bsearch functions for comparing container names | |
1457 | static inline int container_cmp(struct lxc_container **first, struct lxc_container **second) | |
1458 | { | |
1459 | return strcmp((*first)->name, (*second)->name); | |
1460 | } | |
1461 | ||
1462 | static bool add_to_array(char ***names, char *cname, int pos) | |
1463 | { | |
1464 | char **newnames = realloc(*names, (pos+1) * sizeof(char *)); | |
1465 | if (!newnames) { | |
1466 | ERROR("Out of memory"); | |
1467 | return false; | |
1468 | } | |
1469 | ||
1470 | *names = newnames; | |
1471 | newnames[pos] = strdup(cname); | |
1472 | if (!newnames[pos]) | |
1473 | return false; | |
1474 | ||
1475 | // sort the arrray as we will use binary search on it | |
1476 | qsort(newnames, pos + 1, sizeof(char *), (int (*)(const void *,const void *))string_cmp); | |
1477 | ||
1478 | return true; | |
1479 | } | |
1480 | ||
2871830a | 1481 | static bool add_to_clist(struct lxc_container ***list, struct lxc_container *c, int pos, bool sort) |
9c88ff1f ÇO |
1482 | { |
1483 | struct lxc_container **newlist = realloc(*list, (pos+1) * sizeof(struct lxc_container *)); | |
1484 | if (!newlist) { | |
1485 | ERROR("Out of memory"); | |
1486 | return false; | |
1487 | } | |
1488 | ||
1489 | *list = newlist; | |
1490 | newlist[pos] = c; | |
1491 | ||
1492 | // sort the arrray as we will use binary search on it | |
2871830a DE |
1493 | if (sort) |
1494 | qsort(newlist, pos + 1, sizeof(struct lxc_container *), (int (*)(const void *,const void *))container_cmp); | |
9c88ff1f ÇO |
1495 | |
1496 | return true; | |
1497 | } | |
1498 | ||
1499 | static char** get_from_array(char ***names, char *cname, int size) | |
1500 | { | |
1501 | return (char **)bsearch(&cname, *names, size, sizeof(char *), (int (*)(const void *, const void *))string_cmp); | |
1502 | } | |
1503 | ||
1504 | ||
1505 | static bool array_contains(char ***names, char *cname, int size) { | |
1506 | if(get_from_array(names, cname, size) != NULL) | |
1507 | return true; | |
1508 | return false; | |
1509 | } | |
1510 | ||
1511 | static bool remove_from_array(char ***names, char *cname, int size) | |
1512 | { | |
1513 | char **result = get_from_array(names, cname, size); | |
1514 | if (result != NULL) { | |
1515 | free(result); | |
1516 | return true; | |
1517 | } | |
1518 | return false; | |
1519 | } | |
1520 | ||
799f29ab ÇO |
1521 | static char** lxcapi_get_interfaces(struct lxc_container *c) |
1522 | { | |
9c88ff1f | 1523 | int i, count = 0; |
799f29ab | 1524 | struct ifaddrs *interfaceArray = NULL, *tempIfAddr = NULL; |
9c88ff1f | 1525 | char **interfaces = NULL; |
799f29ab ÇO |
1526 | int old_netns = -1, new_netns = -1; |
1527 | ||
1528 | if (!enter_to_ns(c, &old_netns, &new_netns)) | |
1529 | goto out; | |
1530 | ||
1531 | /* Grab the list of interfaces */ | |
1532 | if (getifaddrs(&interfaceArray)) { | |
1533 | SYSERROR("failed to get interfaces list"); | |
1534 | goto out; | |
1535 | } | |
1536 | ||
1537 | /* Iterate through the interfaces */ | |
1538 | for (tempIfAddr = interfaceArray; tempIfAddr != NULL; tempIfAddr = tempIfAddr->ifa_next) { | |
9c88ff1f ÇO |
1539 | if (array_contains(&interfaces, tempIfAddr->ifa_name, count)) |
1540 | continue; | |
799f29ab | 1541 | |
9c88ff1f ÇO |
1542 | if(!add_to_array(&interfaces, tempIfAddr->ifa_name, count)) |
1543 | goto err; | |
1544 | count++; | |
1545 | } | |
799f29ab ÇO |
1546 | |
1547 | out: | |
9c88ff1f ÇO |
1548 | if (interfaceArray) |
1549 | freeifaddrs(interfaceArray); | |
1550 | ||
1551 | exit_from_ns(c, &old_netns, &new_netns); | |
799f29ab | 1552 | |
9c88ff1f ÇO |
1553 | /* Append NULL to the array */ |
1554 | if(interfaces) | |
1555 | interfaces = (char **)lxc_append_null_to_array((void **)interfaces, count); | |
799f29ab | 1556 | |
9c88ff1f | 1557 | return interfaces; |
799f29ab | 1558 | |
9c88ff1f ÇO |
1559 | err: |
1560 | for(i=0;i<count;i++) | |
1561 | free(interfaces[i]); | |
1562 | free(interfaces); | |
1563 | interfaces = NULL; | |
1564 | goto out; | |
799f29ab ÇO |
1565 | } |
1566 | ||
f0ca2726 | 1567 | static char** lxcapi_get_ips(struct lxc_container *c, const char* interface, const char* family, int scope) |
799f29ab | 1568 | { |
9c88ff1f | 1569 | int i, count = 0; |
799f29ab ÇO |
1570 | struct ifaddrs *interfaceArray = NULL, *tempIfAddr = NULL; |
1571 | char addressOutputBuffer[INET6_ADDRSTRLEN]; | |
1572 | void *tempAddrPtr = NULL; | |
9c88ff1f | 1573 | char **addresses = NULL; |
799f29ab ÇO |
1574 | char *address = NULL; |
1575 | int old_netns = -1, new_netns = -1; | |
1576 | ||
1577 | if (!enter_to_ns(c, &old_netns, &new_netns)) | |
1578 | goto out; | |
9c83a661 SG |
1579 | |
1580 | /* Grab the list of interfaces */ | |
1581 | if (getifaddrs(&interfaceArray)) { | |
1582 | SYSERROR("failed to get interfaces list"); | |
1583 | goto out; | |
1584 | } | |
1585 | ||
1586 | /* Iterate through the interfaces */ | |
1587 | for (tempIfAddr = interfaceArray; tempIfAddr != NULL; tempIfAddr = tempIfAddr->ifa_next) { | |
fe218ca3 SG |
1588 | if (tempIfAddr->ifa_addr == NULL) |
1589 | continue; | |
1590 | ||
9c83a661 SG |
1591 | if(tempIfAddr->ifa_addr->sa_family == AF_INET) { |
1592 | if (family && strcmp(family, "inet")) | |
1593 | continue; | |
1594 | tempAddrPtr = &((struct sockaddr_in *)tempIfAddr->ifa_addr)->sin_addr; | |
1595 | } | |
1596 | else { | |
1597 | if (family && strcmp(family, "inet6")) | |
1598 | continue; | |
1599 | ||
1600 | if (((struct sockaddr_in6 *)tempIfAddr->ifa_addr)->sin6_scope_id != scope) | |
1601 | continue; | |
1602 | ||
1603 | tempAddrPtr = &((struct sockaddr_in6 *)tempIfAddr->ifa_addr)->sin6_addr; | |
1604 | } | |
1605 | ||
1606 | if (interface && strcmp(interface, tempIfAddr->ifa_name)) | |
1607 | continue; | |
1608 | else if (!interface && strcmp("lo", tempIfAddr->ifa_name) == 0) | |
1609 | continue; | |
1610 | ||
1611 | address = (char *)inet_ntop(tempIfAddr->ifa_addr->sa_family, | |
1612 | tempAddrPtr, | |
1613 | addressOutputBuffer, | |
1614 | sizeof(addressOutputBuffer)); | |
1615 | if (!address) | |
1616 | continue; | |
1617 | ||
9c88ff1f ÇO |
1618 | if(!add_to_array(&addresses, address, count)) |
1619 | goto err; | |
1620 | count++; | |
9c83a661 SG |
1621 | } |
1622 | ||
1623 | out: | |
1624 | if(interfaceArray) | |
1625 | freeifaddrs(interfaceArray); | |
1626 | ||
799f29ab | 1627 | exit_from_ns(c, &old_netns, &new_netns); |
9c83a661 SG |
1628 | |
1629 | /* Append NULL to the array */ | |
9c88ff1f ÇO |
1630 | if(addresses) |
1631 | addresses = (char **)lxc_append_null_to_array((void **)addresses, count); | |
9c83a661 SG |
1632 | |
1633 | return addresses; | |
9c88ff1f ÇO |
1634 | |
1635 | err: | |
1636 | for(i=0;i<count;i++) | |
1637 | free(addresses[i]); | |
1638 | free(addresses); | |
1639 | addresses = NULL; | |
1640 | ||
1641 | goto out; | |
9c83a661 SG |
1642 | } |
1643 | ||
12a50cc6 | 1644 | static int lxcapi_get_config_item(struct lxc_container *c, const char *key, char *retv, int inlen) |
72d0e1cb SG |
1645 | { |
1646 | int ret; | |
1647 | ||
1648 | if (!c || !c->lxc_conf) | |
1649 | return -1; | |
5cee8c50 | 1650 | if (container_mem_lock(c)) |
72d0e1cb | 1651 | return -1; |
72d0e1cb | 1652 | ret = lxc_get_config_item(c->lxc_conf, key, retv, inlen); |
5cee8c50 | 1653 | container_mem_unlock(c); |
72d0e1cb SG |
1654 | return ret; |
1655 | } | |
1656 | ||
12a50cc6 | 1657 | static int lxcapi_get_keys(struct lxc_container *c, const char *key, char *retv, int inlen) |
72d0e1cb SG |
1658 | { |
1659 | if (!key) | |
1660 | return lxc_listconfigs(retv, inlen); | |
1661 | /* | |
1662 | * Support 'lxc.network.<idx>', i.e. 'lxc.network.0' | |
1663 | * This is an intelligent result to show which keys are valid given | |
1664 | * the type of nic it is | |
1665 | */ | |
1666 | if (!c || !c->lxc_conf) | |
1667 | return -1; | |
5cee8c50 | 1668 | if (container_mem_lock(c)) |
72d0e1cb SG |
1669 | return -1; |
1670 | int ret = -1; | |
1671 | if (strncmp(key, "lxc.network.", 12) == 0) | |
1672 | ret = lxc_list_nicconfigs(c->lxc_conf, key, retv, inlen); | |
5cee8c50 | 1673 | container_mem_unlock(c); |
72d0e1cb SG |
1674 | return ret; |
1675 | } | |
1676 | ||
12a50cc6 | 1677 | static bool lxcapi_save_config(struct lxc_container *c, const char *alt_file) |
72d0e1cb | 1678 | { |
39dc698c SH |
1679 | FILE *fout; |
1680 | bool ret = false, need_disklock = false; | |
1681 | int lret; | |
1682 | ||
72d0e1cb SG |
1683 | if (!alt_file) |
1684 | alt_file = c->configfile; | |
1685 | if (!alt_file) | |
1686 | return false; // should we write to stdout if no file is specified? | |
39dc698c SH |
1687 | |
1688 | // If we haven't yet loaded a config, load the stock config | |
1689 | if (!c->lxc_conf) { | |
72d0e1cb SG |
1690 | if (!c->load_config(c, LXC_DEFAULT_CONFIG)) { |
1691 | ERROR("Error loading default configuration file %s while saving %s\n", LXC_DEFAULT_CONFIG, c->name); | |
1692 | return false; | |
1693 | } | |
39dc698c | 1694 | } |
72d0e1cb | 1695 | |
5a3d2e1e SG |
1696 | if (!create_container_dir(c)) |
1697 | return false; | |
1698 | ||
39dc698c SH |
1699 | /* |
1700 | * If we're writing to the container's config file, take the | |
1701 | * disk lock. Otherwise just take the memlock to protect the | |
1702 | * struct lxc_container while we're traversing it. | |
1703 | */ | |
1704 | if (strcmp(c->configfile, alt_file) == 0) | |
1705 | need_disklock = true; | |
1706 | ||
1707 | if (need_disklock) | |
1708 | lret = container_disk_lock(c); | |
1709 | else | |
1710 | lret = container_mem_lock(c); | |
1711 | ||
1712 | if (lret) | |
72d0e1cb | 1713 | return false; |
39dc698c | 1714 | |
68c9cf36 | 1715 | process_lock(); |
39dc698c | 1716 | fout = fopen(alt_file, "w"); |
68c9cf36 | 1717 | process_unlock(); |
39dc698c SH |
1718 | if (!fout) |
1719 | goto out; | |
72d0e1cb | 1720 | write_config(fout, c->lxc_conf); |
68c9cf36 | 1721 | process_lock(); |
72d0e1cb | 1722 | fclose(fout); |
68c9cf36 | 1723 | process_unlock(); |
39dc698c SH |
1724 | ret = true; |
1725 | ||
1726 | out: | |
1727 | if (need_disklock) | |
1728 | container_disk_unlock(c); | |
1729 | else | |
1730 | container_mem_unlock(c); | |
1731 | return ret; | |
72d0e1cb SG |
1732 | } |
1733 | ||
dfb31b25 SH |
1734 | static bool mod_rdep(struct lxc_container *c, bool inc) |
1735 | { | |
1736 | char path[MAXPATHLEN]; | |
1737 | int ret, v = 0; | |
1738 | FILE *f; | |
1739 | bool bret = false; | |
1740 | ||
1741 | if (container_disk_lock(c)) | |
1742 | return false; | |
1743 | ret = snprintf(path, MAXPATHLEN, "%s/%s/lxc_snapshots", c->config_path, | |
1744 | c->name); | |
1745 | if (ret < 0 || ret > MAXPATHLEN) | |
1746 | goto out; | |
025ed0f3 | 1747 | process_lock(); |
dfb31b25 | 1748 | f = fopen(path, "r"); |
025ed0f3 | 1749 | process_unlock(); |
dfb31b25 SH |
1750 | if (f) { |
1751 | ret = fscanf(f, "%d", &v); | |
025ed0f3 | 1752 | process_lock(); |
dfb31b25 | 1753 | fclose(f); |
025ed0f3 | 1754 | process_unlock(); |
dfb31b25 SH |
1755 | if (ret != 1) { |
1756 | ERROR("Corrupted file %s", path); | |
1757 | goto out; | |
1758 | } | |
1759 | } | |
1760 | v += inc ? 1 : -1; | |
025ed0f3 | 1761 | process_lock(); |
dfb31b25 | 1762 | f = fopen(path, "w"); |
025ed0f3 | 1763 | process_unlock(); |
dfb31b25 SH |
1764 | if (!f) |
1765 | goto out; | |
1766 | if (fprintf(f, "%d\n", v) < 0) { | |
1767 | ERROR("Error writing new snapshots value"); | |
025ed0f3 | 1768 | process_lock(); |
dfb31b25 | 1769 | fclose(f); |
025ed0f3 | 1770 | process_unlock(); |
dfb31b25 SH |
1771 | goto out; |
1772 | } | |
025ed0f3 SH |
1773 | process_lock(); |
1774 | ret = fclose(f); | |
1775 | process_unlock(); | |
1776 | if (ret != 0) { | |
dfb31b25 SH |
1777 | SYSERROR("Error writing to or closing snapshots file"); |
1778 | goto out; | |
1779 | } | |
1780 | ||
1781 | bret = true; | |
1782 | ||
1783 | out: | |
1784 | container_disk_unlock(c); | |
1785 | return bret; | |
1786 | } | |
1787 | ||
1788 | static void strip_newline(char *p) | |
1789 | { | |
1790 | size_t len = strlen(p); | |
1791 | if (len < 1) | |
1792 | return; | |
1793 | if (p[len-1] == '\n') | |
1794 | p[len-1] = '\0'; | |
1795 | } | |
1796 | ||
1797 | static void mod_all_rdeps(struct lxc_container *c, bool inc) | |
1798 | { | |
1799 | struct lxc_container *p; | |
1800 | char *lxcpath = NULL, *lxcname = NULL, path[MAXPATHLEN]; | |
1801 | size_t pathlen = 0, namelen = 0; | |
1802 | FILE *f; | |
1803 | int ret; | |
1804 | ||
1805 | ret = snprintf(path, MAXPATHLEN, "%s/%s/lxc_rdepends", | |
1806 | c->config_path, c->name); | |
1807 | if (ret < 0 || ret >= MAXPATHLEN) { | |
1808 | ERROR("Path name too long"); | |
1809 | return; | |
1810 | } | |
025ed0f3 SH |
1811 | process_lock(); |
1812 | f = fopen(path, "r"); | |
1813 | process_unlock(); | |
1814 | if (f == NULL) | |
dfb31b25 SH |
1815 | return; |
1816 | while (getline(&lxcpath, &pathlen, f) != -1) { | |
1817 | if (getline(&lxcname, &namelen, f) == -1) { | |
1818 | ERROR("badly formatted file %s\n", path); | |
1819 | goto out; | |
1820 | } | |
1821 | strip_newline(lxcpath); | |
1822 | strip_newline(lxcname); | |
1823 | if ((p = lxc_container_new(lxcname, lxcpath)) == NULL) { | |
1824 | ERROR("Unable to find dependent container %s:%s", | |
1825 | lxcpath, lxcname); | |
1826 | continue; | |
1827 | } | |
1828 | if (!mod_rdep(p, inc)) | |
1829 | ERROR("Failed to increase numsnapshots for %s:%s", | |
1830 | lxcpath, lxcname); | |
1831 | lxc_container_put(p); | |
1832 | } | |
1833 | out: | |
1834 | if (lxcpath) free(lxcpath); | |
1835 | if (lxcname) free(lxcname); | |
025ed0f3 | 1836 | process_lock(); |
dfb31b25 | 1837 | fclose(f); |
025ed0f3 | 1838 | process_unlock(); |
dfb31b25 SH |
1839 | } |
1840 | ||
1841 | static bool has_snapshots(struct lxc_container *c) | |
1842 | { | |
1843 | char path[MAXPATHLEN]; | |
1844 | int ret, v; | |
1845 | FILE *f; | |
1846 | bool bret = false; | |
1847 | ||
1848 | ret = snprintf(path, MAXPATHLEN, "%s/%s/lxc_snapshots", c->config_path, | |
1849 | c->name); | |
1850 | if (ret < 0 || ret > MAXPATHLEN) | |
1851 | goto out; | |
025ed0f3 | 1852 | process_lock(); |
dfb31b25 | 1853 | f = fopen(path, "r"); |
025ed0f3 | 1854 | process_unlock(); |
dfb31b25 SH |
1855 | if (!f) |
1856 | goto out; | |
1857 | ret = fscanf(f, "%d", &v); | |
025ed0f3 | 1858 | process_lock(); |
dfb31b25 | 1859 | fclose(f); |
025ed0f3 | 1860 | process_unlock(); |
dfb31b25 SH |
1861 | if (ret != 1) |
1862 | goto out; | |
1863 | bret = v != 0; | |
1864 | ||
1865 | out: | |
1866 | return bret; | |
1867 | } | |
1868 | ||
4355ab5f SH |
1869 | static int lxc_rmdir_onedev_wrapper(void *data) |
1870 | { | |
1871 | char *arg = (char *) data; | |
1872 | return lxc_rmdir_onedev(arg); | |
1873 | } | |
1874 | ||
60bf62d4 | 1875 | // do we want the api to support --force, or leave that to the caller? |
72d0e1cb SG |
1876 | static bool lxcapi_destroy(struct lxc_container *c) |
1877 | { | |
1897e3bc | 1878 | struct bdev *r = NULL; |
fef48dc9 SH |
1879 | bool bret = false, am_unpriv; |
1880 | int ret; | |
72d0e1cb | 1881 | |
1897e3bc | 1882 | if (!c || !lxcapi_is_defined(c)) |
5a3d2e1e SG |
1883 | return false; |
1884 | ||
3bc449ed | 1885 | if (container_disk_lock(c)) |
72d0e1cb | 1886 | return false; |
72d0e1cb | 1887 | |
39dc698c | 1888 | if (!is_stopped(c)) { |
60bf62d4 SH |
1889 | // we should queue some sort of error - in c->error_string? |
1890 | ERROR("container %s is not stopped", c->name); | |
1891 | goto out; | |
72d0e1cb SG |
1892 | } |
1893 | ||
4355ab5f SH |
1894 | am_unpriv = c->lxc_conf && geteuid() != 0 && !lxc_list_empty(&c->lxc_conf->id_map); |
1895 | ||
dfb31b25 | 1896 | if (c->lxc_conf && has_snapshots(c)) { |
2a2d36a4 | 1897 | ERROR("container %s has dependent snapshots", c->name); |
dfb31b25 SH |
1898 | goto out; |
1899 | } | |
1900 | ||
4355ab5f | 1901 | if (!am_unpriv && c->lxc_conf->rootfs.path && c->lxc_conf->rootfs.mount) { |
1897e3bc | 1902 | r = bdev_init(c->lxc_conf->rootfs.path, c->lxc_conf->rootfs.mount, NULL); |
4355ab5f SH |
1903 | if (r) { |
1904 | if (r->ops->destroy(r) < 0) { | |
1905 | bdev_put(r); | |
1906 | ERROR("Error destroying rootfs for %s", c->name); | |
1907 | goto out; | |
1908 | } | |
59d66af2 | 1909 | bdev_put(r); |
60bf62d4 SH |
1910 | } |
1911 | } | |
1912 | ||
dfb31b25 SH |
1913 | mod_all_rdeps(c, false); |
1914 | ||
60bf62d4 SH |
1915 | const char *p1 = lxcapi_get_config_path(c); |
1916 | char *path = alloca(strlen(p1) + strlen(c->name) + 2); | |
1917 | sprintf(path, "%s/%s", p1, c->name); | |
4355ab5f SH |
1918 | if (am_unpriv) |
1919 | ret = userns_exec_1(c->lxc_conf, lxc_rmdir_onedev_wrapper, path); | |
1920 | else | |
1921 | ret = lxc_rmdir_onedev(path); | |
1922 | if (ret < 0) { | |
60bf62d4 SH |
1923 | ERROR("Error destroying container directory for %s", c->name); |
1924 | goto out; | |
1925 | } | |
fef48dc9 | 1926 | bret = true; |
60bf62d4 SH |
1927 | |
1928 | out: | |
3bc449ed | 1929 | container_disk_unlock(c); |
fef48dc9 | 1930 | return bret; |
72d0e1cb SG |
1931 | } |
1932 | ||
96532523 SH |
1933 | static bool set_config_item_locked(struct lxc_container *c, const char *key, const char *v) |
1934 | { | |
1935 | struct lxc_config_t *config; | |
1936 | ||
1937 | if (!c->lxc_conf) | |
1938 | c->lxc_conf = lxc_conf_init(); | |
1939 | if (!c->lxc_conf) | |
1940 | return false; | |
1941 | config = lxc_getconfig(key); | |
1942 | if (!config) | |
1943 | return false; | |
1944 | return (0 == config->cb(key, v, c->lxc_conf)); | |
1945 | } | |
1946 | ||
12a50cc6 | 1947 | static bool lxcapi_set_config_item(struct lxc_container *c, const char *key, const char *v) |
72d0e1cb | 1948 | { |
72d0e1cb | 1949 | bool b = false; |
72d0e1cb SG |
1950 | |
1951 | if (!c) | |
1952 | return false; | |
1953 | ||
5cee8c50 | 1954 | if (container_mem_lock(c)) |
72d0e1cb SG |
1955 | return false; |
1956 | ||
96532523 | 1957 | b = set_config_item_locked(c, key, v); |
72d0e1cb | 1958 | |
5cee8c50 | 1959 | container_mem_unlock(c); |
72d0e1cb SG |
1960 | return b; |
1961 | } | |
1962 | ||
1963 | static char *lxcapi_config_file_name(struct lxc_container *c) | |
1964 | { | |
1965 | if (!c || !c->configfile) | |
1966 | return NULL; | |
1967 | return strdup(c->configfile); | |
1968 | } | |
1969 | ||
2a59a681 SH |
1970 | static const char *lxcapi_get_config_path(struct lxc_container *c) |
1971 | { | |
1972 | if (!c || !c->config_path) | |
1973 | return NULL; | |
1974 | return (const char *)(c->config_path); | |
1975 | } | |
1976 | ||
afeecbba SH |
1977 | /* |
1978 | * not for export | |
1979 | * Just recalculate the c->configfile based on the | |
1980 | * c->config_path, which must be set. | |
1981 | * The lxc_container must be locked or not yet public. | |
1982 | */ | |
1983 | static bool set_config_filename(struct lxc_container *c) | |
1984 | { | |
1985 | char *newpath; | |
1986 | int len, ret; | |
1987 | ||
1988 | if (!c->config_path) | |
1989 | return false; | |
1990 | ||
1991 | /* $lxc_path + "/" + c->name + "/" + "config" + '\0' */ | |
1992 | len = strlen(c->config_path) + strlen(c->name) + strlen("config") + 3; | |
1993 | newpath = malloc(len); | |
1994 | if (!newpath) | |
1995 | return false; | |
1996 | ||
1997 | ret = snprintf(newpath, len, "%s/%s/config", c->config_path, c->name); | |
1998 | if (ret < 0 || ret >= len) { | |
1999 | fprintf(stderr, "Error printing out config file name\n"); | |
2000 | free(newpath); | |
2001 | return false; | |
2002 | } | |
2003 | ||
2004 | if (c->configfile) | |
2005 | free(c->configfile); | |
2006 | c->configfile = newpath; | |
2007 | ||
2008 | return true; | |
2009 | } | |
2010 | ||
2a59a681 SH |
2011 | static bool lxcapi_set_config_path(struct lxc_container *c, const char *path) |
2012 | { | |
2013 | char *p; | |
2014 | bool b = false; | |
afeecbba | 2015 | char *oldpath = NULL; |
2a59a681 SH |
2016 | |
2017 | if (!c) | |
2018 | return b; | |
2019 | ||
5cee8c50 | 2020 | if (container_mem_lock(c)) |
2a59a681 SH |
2021 | return b; |
2022 | ||
2023 | p = strdup(path); | |
afeecbba SH |
2024 | if (!p) { |
2025 | ERROR("Out of memory setting new lxc path"); | |
2a59a681 | 2026 | goto err; |
afeecbba SH |
2027 | } |
2028 | ||
2a59a681 SH |
2029 | b = true; |
2030 | if (c->config_path) | |
afeecbba | 2031 | oldpath = c->config_path; |
2a59a681 | 2032 | c->config_path = p; |
afeecbba SH |
2033 | |
2034 | /* Since we've changed the config path, we have to change the | |
2035 | * config file name too */ | |
2036 | if (!set_config_filename(c)) { | |
2037 | ERROR("Out of memory setting new config filename"); | |
2038 | b = false; | |
2039 | free(c->config_path); | |
2040 | c->config_path = oldpath; | |
2041 | oldpath = NULL; | |
2042 | } | |
2a59a681 | 2043 | err: |
afeecbba SH |
2044 | if (oldpath) |
2045 | free(oldpath); | |
5cee8c50 | 2046 | container_mem_unlock(c); |
2a59a681 SH |
2047 | return b; |
2048 | } | |
2049 | ||
2050 | ||
794dd120 SH |
2051 | static bool lxcapi_set_cgroup_item(struct lxc_container *c, const char *subsys, const char *value) |
2052 | { | |
2053 | int ret; | |
794dd120 SH |
2054 | |
2055 | if (!c) | |
2056 | return false; | |
2057 | ||
3bc449ed | 2058 | if (is_stopped(c)) |
794dd120 SH |
2059 | return false; |
2060 | ||
3bc449ed SH |
2061 | if (container_disk_lock(c)) |
2062 | return false; | |
794dd120 | 2063 | |
33ad9f1a | 2064 | ret = lxc_cgroup_set(subsys, value, c->name, c->config_path); |
3bc449ed SH |
2065 | |
2066 | container_disk_unlock(c); | |
2067 | return ret == 0; | |
794dd120 SH |
2068 | } |
2069 | ||
2070 | static int lxcapi_get_cgroup_item(struct lxc_container *c, const char *subsys, char *retv, int inlen) | |
2071 | { | |
3bc449ed | 2072 | int ret; |
794dd120 | 2073 | |
6502006a | 2074 | if (!c) |
794dd120 SH |
2075 | return -1; |
2076 | ||
3bc449ed | 2077 | if (is_stopped(c)) |
794dd120 SH |
2078 | return -1; |
2079 | ||
3bc449ed SH |
2080 | if (container_disk_lock(c)) |
2081 | return -1; | |
794dd120 | 2082 | |
33ad9f1a | 2083 | ret = lxc_cgroup_get(subsys, retv, inlen, c->name, c->config_path); |
794dd120 | 2084 | |
3bc449ed | 2085 | container_disk_unlock(c); |
794dd120 SH |
2086 | return ret; |
2087 | } | |
2088 | ||
67e571de | 2089 | const char *lxc_get_default_config_path(void) |
83c98d82 DE |
2090 | { |
2091 | return default_lxc_path(); | |
2092 | } | |
794dd120 | 2093 | |
a8428dfa SH |
2094 | const char *lxc_get_default_lvm_vg(void) |
2095 | { | |
2096 | return default_lvm_vg(); | |
2097 | } | |
2098 | ||
f99c386b SS |
2099 | const char *lxc_get_default_lvm_thin_pool(void) |
2100 | { | |
2101 | return default_lvm_thin_pool(); | |
2102 | } | |
2103 | ||
a8428dfa SH |
2104 | const char *lxc_get_default_zfs_root(void) |
2105 | { | |
2106 | return default_zfs_root(); | |
2107 | } | |
2108 | ||
b6b918a1 SG |
2109 | const char *lxc_get_version(void) |
2110 | { | |
95ee490b | 2111 | return LXC_VERSION; |
b6b918a1 SG |
2112 | } |
2113 | ||
f0ca2726 | 2114 | static int copy_file(const char *old, const char *new) |
9be53773 SH |
2115 | { |
2116 | int in, out; | |
2117 | ssize_t len, ret; | |
2118 | char buf[8096]; | |
2119 | struct stat sbuf; | |
2120 | ||
2121 | if (file_exists(new)) { | |
2122 | ERROR("copy destination %s exists", new); | |
2123 | return -1; | |
2124 | } | |
2125 | ret = stat(old, &sbuf); | |
2126 | if (ret < 0) { | |
dfb31b25 | 2127 | INFO("Error stat'ing %s", old); |
9be53773 SH |
2128 | return -1; |
2129 | } | |
2130 | ||
025ed0f3 | 2131 | process_lock(); |
9be53773 | 2132 | in = open(old, O_RDONLY); |
025ed0f3 | 2133 | process_unlock(); |
9be53773 | 2134 | if (in < 0) { |
dfb31b25 | 2135 | SYSERROR("Error opening original file %s", old); |
9be53773 SH |
2136 | return -1; |
2137 | } | |
025ed0f3 | 2138 | process_lock(); |
9be53773 | 2139 | out = open(new, O_CREAT | O_EXCL | O_WRONLY, 0644); |
025ed0f3 | 2140 | process_unlock(); |
9be53773 | 2141 | if (out < 0) { |
dfb31b25 | 2142 | SYSERROR("Error opening new file %s", new); |
025ed0f3 | 2143 | process_lock(); |
9be53773 | 2144 | close(in); |
025ed0f3 | 2145 | process_unlock(); |
9be53773 SH |
2146 | return -1; |
2147 | } | |
2148 | ||
2149 | while (1) { | |
2150 | len = read(in, buf, 8096); | |
2151 | if (len < 0) { | |
dfb31b25 | 2152 | SYSERROR("Error reading old file %s", old); |
9be53773 SH |
2153 | goto err; |
2154 | } | |
2155 | if (len == 0) | |
2156 | break; | |
2157 | ret = write(out, buf, len); | |
2158 | if (ret < len) { // should we retry? | |
dfb31b25 | 2159 | SYSERROR("Error: write to new file %s was interrupted", new); |
9be53773 SH |
2160 | goto err; |
2161 | } | |
2162 | } | |
025ed0f3 | 2163 | process_lock(); |
9be53773 SH |
2164 | close(in); |
2165 | close(out); | |
025ed0f3 | 2166 | process_unlock(); |
9be53773 SH |
2167 | |
2168 | // we set mode, but not owner/group | |
2169 | ret = chmod(new, sbuf.st_mode); | |
2170 | if (ret) { | |
dfb31b25 | 2171 | SYSERROR("Error setting mode on %s", new); |
9be53773 SH |
2172 | return -1; |
2173 | } | |
2174 | ||
2175 | return 0; | |
2176 | ||
2177 | err: | |
025ed0f3 | 2178 | process_lock(); |
9be53773 SH |
2179 | close(in); |
2180 | close(out); | |
025ed0f3 | 2181 | process_unlock(); |
9be53773 SH |
2182 | return -1; |
2183 | } | |
2184 | ||
9be53773 SH |
2185 | static int copyhooks(struct lxc_container *oldc, struct lxc_container *c) |
2186 | { | |
2187 | int i; | |
2188 | int ret; | |
2189 | struct lxc_list *it; | |
2190 | ||
2191 | for (i=0; i<NUM_LXC_HOOKS; i++) { | |
2192 | lxc_list_for_each(it, &c->lxc_conf->hooks[i]) { | |
2193 | char *hookname = it->elem; | |
c32981c3 | 2194 | char *fname = strrchr(hookname, '/'); |
9be53773 SH |
2195 | char tmppath[MAXPATHLEN]; |
2196 | if (!fname) // relative path - we don't support, but maybe we should | |
2197 | return 0; | |
2198 | // copy the script, and change the entry in confile | |
2199 | ret = snprintf(tmppath, MAXPATHLEN, "%s/%s/%s", | |
2200 | c->config_path, c->name, fname+1); | |
2201 | if (ret < 0 || ret >= MAXPATHLEN) | |
2202 | return -1; | |
2203 | ret = copy_file(it->elem, tmppath); | |
2204 | if (ret < 0) | |
2205 | return -1; | |
2206 | free(it->elem); | |
2207 | it->elem = strdup(tmppath); | |
2208 | if (!it->elem) { | |
2209 | ERROR("out of memory copying hook path"); | |
2210 | return -1; | |
2211 | } | |
9be53773 SH |
2212 | } |
2213 | } | |
2214 | ||
2215 | c->save_config(c, NULL); | |
2216 | return 0; | |
2217 | } | |
2218 | ||
2219 | static void new_hwaddr(char *hwaddr) | |
2220 | { | |
025ed0f3 SH |
2221 | FILE *f; |
2222 | process_lock(); | |
2223 | f = fopen("/dev/urandom", "r"); | |
2224 | process_unlock(); | |
9be53773 SH |
2225 | if (f) { |
2226 | unsigned int seed; | |
2227 | int ret = fread(&seed, sizeof(seed), 1, f); | |
2228 | if (ret != 1) | |
2229 | seed = time(NULL); | |
025ed0f3 | 2230 | process_lock(); |
9be53773 | 2231 | fclose(f); |
025ed0f3 | 2232 | process_unlock(); |
9be53773 SH |
2233 | srand(seed); |
2234 | } else | |
2235 | srand(time(NULL)); | |
2236 | snprintf(hwaddr, 18, "00:16:3e:%02x:%02x:%02x", | |
2237 | rand() % 255, rand() % 255, rand() % 255); | |
2238 | } | |
2239 | ||
2240 | static void network_new_hwaddrs(struct lxc_container *c) | |
2241 | { | |
2242 | struct lxc_list *it; | |
2243 | ||
2244 | lxc_list_for_each(it, &c->lxc_conf->network) { | |
2245 | struct lxc_netdev *n = it->elem; | |
2246 | if (n->hwaddr) | |
2247 | new_hwaddr(n->hwaddr); | |
2248 | } | |
2249 | } | |
2250 | ||
2251 | static int copy_fstab(struct lxc_container *oldc, struct lxc_container *c) | |
2252 | { | |
2253 | char newpath[MAXPATHLEN]; | |
2254 | char *oldpath = oldc->lxc_conf->fstab; | |
2255 | int ret; | |
2256 | ||
2257 | if (!oldpath) | |
2258 | return 0; | |
2259 | ||
c32981c3 | 2260 | char *p = strrchr(oldpath, '/'); |
9be53773 SH |
2261 | if (!p) |
2262 | return -1; | |
2263 | ret = snprintf(newpath, MAXPATHLEN, "%s/%s%s", | |
2264 | c->config_path, c->name, p); | |
2265 | if (ret < 0 || ret >= MAXPATHLEN) { | |
2266 | ERROR("error printing new path for %s", oldpath); | |
2267 | return -1; | |
2268 | } | |
2269 | if (file_exists(newpath)) { | |
2270 | ERROR("error: fstab file %s exists", newpath); | |
2271 | return -1; | |
2272 | } | |
2273 | ||
2274 | if (copy_file(oldpath, newpath) < 0) { | |
2275 | ERROR("error: copying %s to %s", oldpath, newpath); | |
2276 | return -1; | |
2277 | } | |
2278 | free(c->lxc_conf->fstab); | |
2279 | c->lxc_conf->fstab = strdup(newpath); | |
2280 | if (!c->lxc_conf->fstab) { | |
2281 | ERROR("error: allocating pathname"); | |
2282 | return -1; | |
2283 | } | |
2284 | ||
2285 | return 0; | |
2286 | } | |
2287 | ||
dfb31b25 SH |
2288 | static void copy_rdepends(struct lxc_container *c, struct lxc_container *c0) |
2289 | { | |
2290 | char path0[MAXPATHLEN], path1[MAXPATHLEN]; | |
2291 | int ret; | |
2292 | ||
2293 | ret = snprintf(path0, MAXPATHLEN, "%s/%s/lxc_rdepends", c0->config_path, | |
2294 | c0->name); | |
2295 | if (ret < 0 || ret >= MAXPATHLEN) { | |
2296 | WARN("Error copying reverse dependencies"); | |
2297 | return; | |
2298 | } | |
2299 | ret = snprintf(path1, MAXPATHLEN, "%s/%s/lxc_rdepends", c->config_path, | |
2300 | c->name); | |
2301 | if (ret < 0 || ret >= MAXPATHLEN) { | |
2302 | WARN("Error copying reverse dependencies"); | |
2303 | return; | |
2304 | } | |
2305 | if (copy_file(path0, path1) < 0) { | |
2306 | INFO("Error copying reverse dependencies"); | |
2307 | return; | |
2308 | } | |
2309 | } | |
2310 | ||
2311 | static bool add_rdepends(struct lxc_container *c, struct lxc_container *c0) | |
2312 | { | |
2313 | int ret; | |
2314 | char path[MAXPATHLEN]; | |
2315 | FILE *f; | |
2316 | bool bret; | |
2317 | ||
2318 | ret = snprintf(path, MAXPATHLEN, "%s/%s/lxc_rdepends", c->config_path, | |
2319 | c->name); | |
2320 | if (ret < 0 || ret >= MAXPATHLEN) | |
2321 | return false; | |
025ed0f3 | 2322 | process_lock(); |
dfb31b25 | 2323 | f = fopen(path, "a"); |
025ed0f3 | 2324 | process_unlock(); |
dfb31b25 SH |
2325 | if (!f) |
2326 | return false; | |
2327 | bret = true; | |
2328 | // if anything goes wrong, just return an error | |
2329 | if (fprintf(f, "%s\n%s\n", c0->config_path, c0->name) < 0) | |
2330 | bret = false; | |
025ed0f3 | 2331 | process_lock(); |
dfb31b25 SH |
2332 | if (fclose(f) != 0) |
2333 | bret = false; | |
025ed0f3 | 2334 | process_unlock(); |
dfb31b25 SH |
2335 | return bret; |
2336 | } | |
2337 | ||
9be53773 SH |
2338 | static int copy_storage(struct lxc_container *c0, struct lxc_container *c, |
2339 | const char *newtype, int flags, const char *bdevdata, unsigned long newsize) | |
2340 | { | |
2341 | struct bdev *bdev; | |
dfb31b25 | 2342 | int need_rdep; |
9be53773 SH |
2343 | |
2344 | bdev = bdev_copy(c0->lxc_conf->rootfs.path, c0->name, c->name, | |
2345 | c0->config_path, c->config_path, newtype, !!(flags & LXC_CLONE_SNAPSHOT), | |
dfb31b25 | 2346 | bdevdata, newsize, &need_rdep); |
9be53773 | 2347 | if (!bdev) { |
dfb31b25 | 2348 | ERROR("Error copying storage"); |
9be53773 SH |
2349 | return -1; |
2350 | } | |
2351 | free(c->lxc_conf->rootfs.path); | |
2352 | c->lxc_conf->rootfs.path = strdup(bdev->src); | |
2353 | bdev_put(bdev); | |
dfb31b25 SH |
2354 | if (!c->lxc_conf->rootfs.path) { |
2355 | ERROR("Out of memory while setting storage path"); | |
9be53773 | 2356 | return -1; |
dfb31b25 | 2357 | } |
eee59f94 SH |
2358 | if (flags & LXC_CLONE_SNAPSHOT) |
2359 | copy_rdepends(c, c0); | |
dfb31b25 SH |
2360 | if (need_rdep) { |
2361 | if (!add_rdepends(c, c0)) | |
2362 | WARN("Error adding reverse dependency from %s to %s", | |
2363 | c->name, c0->name); | |
2364 | } | |
2365 | ||
2366 | mod_all_rdeps(c, true); | |
2367 | ||
9be53773 SH |
2368 | return 0; |
2369 | } | |
2370 | ||
1143ed39 DE |
2371 | static int clone_update_rootfs(struct lxc_container *c0, |
2372 | struct lxc_container *c, int flags, | |
2373 | char **hookargs) | |
9be53773 SH |
2374 | { |
2375 | int ret = -1; | |
2376 | char path[MAXPATHLEN]; | |
2377 | struct bdev *bdev; | |
2378 | FILE *fout; | |
2379 | pid_t pid; | |
148e91f5 | 2380 | struct lxc_conf *conf = c->lxc_conf; |
9be53773 SH |
2381 | |
2382 | /* update hostname in rootfs */ | |
2383 | /* we're going to mount, so run in a clean namespace to simplify cleanup */ | |
2384 | ||
2385 | pid = fork(); | |
2386 | if (pid < 0) | |
2387 | return -1; | |
2388 | if (pid > 0) | |
2389 | return wait_for_pid(pid); | |
2390 | ||
025ed0f3 | 2391 | process_unlock(); // we're no longer sharing |
9be53773 SH |
2392 | bdev = bdev_init(c->lxc_conf->rootfs.path, c->lxc_conf->rootfs.mount, NULL); |
2393 | if (!bdev) | |
2394 | exit(1); | |
cf3ef16d SH |
2395 | if (strcmp(bdev->type, "dir") != 0) { |
2396 | if (unshare(CLONE_NEWNS) < 0) { | |
2397 | ERROR("error unsharing mounts"); | |
2398 | exit(1); | |
2399 | } | |
2400 | if (bdev->ops->mount(bdev) < 0) | |
2401 | exit(1); | |
2402 | } else { // TODO come up with a better way | |
2403 | if (bdev->dest) | |
2404 | free(bdev->dest); | |
2405 | bdev->dest = strdup(bdev->src); | |
2406 | } | |
148e91f5 SH |
2407 | |
2408 | if (!lxc_list_empty(&conf->hooks[LXCHOOK_CLONE])) { | |
2409 | /* Start of environment variable setup for hooks */ | |
1143ed39 DE |
2410 | if (setenv("LXC_SRC_NAME", c0->name, 1)) { |
2411 | SYSERROR("failed to set environment variable for source container name"); | |
2412 | } | |
148e91f5 SH |
2413 | if (setenv("LXC_NAME", c->name, 1)) { |
2414 | SYSERROR("failed to set environment variable for container name"); | |
2415 | } | |
2416 | if (setenv("LXC_CONFIG_FILE", conf->rcfile, 1)) { | |
2417 | SYSERROR("failed to set environment variable for config path"); | |
2418 | } | |
24ef39f4 | 2419 | if (setenv("LXC_ROOTFS_MOUNT", bdev->dest, 1)) { |
148e91f5 SH |
2420 | SYSERROR("failed to set environment variable for rootfs mount"); |
2421 | } | |
2422 | if (setenv("LXC_ROOTFS_PATH", conf->rootfs.path, 1)) { | |
2423 | SYSERROR("failed to set environment variable for rootfs mount"); | |
2424 | } | |
2425 | ||
283678ed | 2426 | if (run_lxc_hooks(c->name, "clone", conf, c->get_config_path(c), hookargs)) { |
148e91f5 SH |
2427 | ERROR("Error executing clone hook for %s", c->name); |
2428 | exit(1); | |
2429 | } | |
2430 | } | |
2431 | ||
2432 | if (!(flags & LXC_CLONE_KEEPNAME)) { | |
2433 | ret = snprintf(path, MAXPATHLEN, "%s/etc/hostname", bdev->dest); | |
2434 | if (ret < 0 || ret >= MAXPATHLEN) | |
2435 | exit(1); | |
8058be39 DE |
2436 | if (!file_exists(path)) |
2437 | exit(0); | |
148e91f5 SH |
2438 | if (!(fout = fopen(path, "w"))) { |
2439 | SYSERROR("unable to open %s: ignoring\n", path); | |
2440 | exit(0); | |
2441 | } | |
2442 | if (fprintf(fout, "%s", c->name) < 0) | |
2443 | exit(1); | |
2444 | if (fclose(fout) < 0) | |
2445 | exit(1); | |
9be53773 | 2446 | } |
9be53773 SH |
2447 | exit(0); |
2448 | } | |
2449 | ||
2450 | /* | |
2451 | * We want to support: | |
2452 | sudo lxc-clone -o o1 -n n1 -s -L|-fssize fssize -v|--vgname vgname \ | |
2453 | -p|--lvprefix lvprefix -t|--fstype fstype -B backingstore | |
2454 | ||
2455 | -s [ implies overlayfs] | |
2456 | -s -B overlayfs | |
2457 | -s -B aufs | |
2458 | ||
2459 | only rootfs gets converted (copied/snapshotted) on clone. | |
2460 | */ | |
2461 | ||
2462 | static int create_file_dirname(char *path) | |
2463 | { | |
c32981c3 | 2464 | char *p = strrchr(path, '/'); |
9be53773 SH |
2465 | int ret; |
2466 | ||
2467 | if (!p) | |
2468 | return -1; | |
2469 | *p = '\0'; | |
2470 | ret = mkdir(path, 0755); | |
2471 | if (ret && errno != EEXIST) | |
2472 | SYSERROR("creating container path %s\n", path); | |
2473 | *p = '/'; | |
2474 | return ret; | |
2475 | } | |
2476 | ||
2477 | struct lxc_container *lxcapi_clone(struct lxc_container *c, const char *newname, | |
2478 | const char *lxcpath, int flags, | |
148e91f5 SH |
2479 | const char *bdevtype, const char *bdevdata, unsigned long newsize, |
2480 | char **hookargs) | |
9be53773 SH |
2481 | { |
2482 | struct lxc_container *c2 = NULL; | |
2483 | char newpath[MAXPATHLEN]; | |
176d9acb | 2484 | int ret, storage_copied = 0; |
9be53773 SH |
2485 | const char *n, *l; |
2486 | FILE *fout; | |
2487 | ||
2488 | if (!c || !c->is_defined(c)) | |
2489 | return NULL; | |
2490 | ||
5cee8c50 | 2491 | if (container_mem_lock(c)) |
9be53773 SH |
2492 | return NULL; |
2493 | ||
39dc698c | 2494 | if (!is_stopped(c)) { |
9be53773 SH |
2495 | ERROR("error: Original container (%s) is running", c->name); |
2496 | goto out; | |
2497 | } | |
2498 | ||
2499 | // Make sure the container doesn't yet exist. | |
2500 | n = newname ? newname : c->name; | |
2501 | l = lxcpath ? lxcpath : c->get_config_path(c); | |
2502 | ret = snprintf(newpath, MAXPATHLEN, "%s/%s/config", l, n); | |
2503 | if (ret < 0 || ret >= MAXPATHLEN) { | |
2504 | SYSERROR("clone: failed making config pathname"); | |
2505 | goto out; | |
2506 | } | |
2507 | if (file_exists(newpath)) { | |
2508 | ERROR("error: clone: %s exists", newpath); | |
2509 | goto out; | |
2510 | } | |
2511 | ||
96532523 SH |
2512 | ret = create_file_dirname(newpath); |
2513 | if (ret < 0 && errno != EEXIST) { | |
9be53773 SH |
2514 | ERROR("Error creating container dir for %s", newpath); |
2515 | goto out; | |
2516 | } | |
2517 | ||
2518 | // copy the configuration, tweak it as needed, | |
025ed0f3 | 2519 | process_lock(); |
9be53773 | 2520 | fout = fopen(newpath, "w"); |
025ed0f3 | 2521 | process_unlock(); |
9be53773 SH |
2522 | if (!fout) { |
2523 | SYSERROR("open %s", newpath); | |
2524 | goto out; | |
2525 | } | |
2526 | write_config(fout, c->lxc_conf); | |
025ed0f3 | 2527 | process_lock(); |
9be53773 | 2528 | fclose(fout); |
025ed0f3 | 2529 | process_unlock(); |
9be53773 | 2530 | |
9be53773 SH |
2531 | sprintf(newpath, "%s/%s/rootfs", l, n); |
2532 | if (mkdir(newpath, 0755) < 0) { | |
2533 | SYSERROR("error creating %s", newpath); | |
2534 | goto out; | |
2535 | } | |
2536 | ||
2537 | c2 = lxc_container_new(n, l); | |
375c2258 | 2538 | if (!c2) { |
9be53773 SH |
2539 | ERROR("clone: failed to create new container (%s %s)", n, l); |
2540 | goto out; | |
2541 | } | |
2542 | ||
96532523 SH |
2543 | // update utsname |
2544 | if (!set_config_item_locked(c2, "lxc.utsname", newname)) { | |
2545 | ERROR("Error setting new hostname"); | |
2546 | goto out; | |
2547 | } | |
2548 | ||
2549 | ||
9be53773 SH |
2550 | // copy hooks if requested |
2551 | if (flags & LXC_CLONE_COPYHOOKS) { | |
2552 | ret = copyhooks(c, c2); | |
2553 | if (ret < 0) { | |
2554 | ERROR("error copying hooks"); | |
9be53773 SH |
2555 | goto out; |
2556 | } | |
2557 | } | |
2558 | ||
2559 | if (copy_fstab(c, c2) < 0) { | |
2560 | ERROR("error copying fstab"); | |
9be53773 SH |
2561 | goto out; |
2562 | } | |
2563 | ||
2564 | // update macaddrs | |
2565 | if (!(flags & LXC_CLONE_KEEPMACADDR)) | |
2566 | network_new_hwaddrs(c2); | |
2567 | ||
2568 | // copy/snapshot rootfs's | |
2569 | ret = copy_storage(c, c2, bdevtype, flags, bdevdata, newsize); | |
375c2258 | 2570 | if (ret < 0) |
9be53773 | 2571 | goto out; |
9be53773 | 2572 | |
176d9acb SH |
2573 | // We've now successfully created c2's storage, so clear it out if we |
2574 | // fail after this | |
2575 | storage_copied = 1; | |
2576 | ||
375c2258 | 2577 | if (!c2->save_config(c2, NULL)) |
9be53773 | 2578 | goto out; |
9be53773 | 2579 | |
1143ed39 | 2580 | if (clone_update_rootfs(c, c2, flags, hookargs) < 0) |
9be53773 | 2581 | goto out; |
9be53773 SH |
2582 | |
2583 | // TODO: update c's lxc.snapshot = count | |
5cee8c50 | 2584 | container_mem_unlock(c); |
9be53773 SH |
2585 | return c2; |
2586 | ||
2587 | out: | |
5cee8c50 | 2588 | container_mem_unlock(c); |
375c2258 | 2589 | if (c2) { |
176d9acb SH |
2590 | if (!storage_copied) |
2591 | c2->lxc_conf->rootfs.path = NULL; | |
375c2258 | 2592 | c2->destroy(c2); |
9be53773 | 2593 | lxc_container_put(c2); |
375c2258 | 2594 | } |
9be53773 SH |
2595 | |
2596 | return NULL; | |
2597 | } | |
2598 | ||
a0e93eeb CS |
2599 | 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) |
2600 | { | |
2601 | if (!c) | |
2602 | return -1; | |
2603 | ||
2604 | return lxc_attach(c->name, c->config_path, exec_function, exec_payload, options, attached_process); | |
2605 | } | |
2606 | ||
2607 | static int lxcapi_attach_run_wait(struct lxc_container *c, lxc_attach_options_t *options, const char *program, const char * const argv[]) | |
2608 | { | |
2609 | lxc_attach_command_t command; | |
2610 | pid_t pid; | |
2611 | int r; | |
2612 | ||
2613 | if (!c) | |
2614 | return -1; | |
2615 | ||
2616 | command.program = (char*)program; | |
2617 | command.argv = (char**)argv; | |
2618 | r = lxc_attach(c->name, c->config_path, lxc_attach_run_command, &command, options, &pid); | |
2619 | if (r < 0) { | |
2620 | ERROR("ups"); | |
2621 | return r; | |
2622 | } | |
2623 | return lxc_wait_for_pid_status(pid); | |
2624 | } | |
2625 | ||
f5dd1d53 SH |
2626 | int get_next_index(const char *lxcpath, char *cname) |
2627 | { | |
2628 | char *fname; | |
2629 | struct stat sb; | |
2630 | int i = 0, ret; | |
2631 | ||
2632 | fname = alloca(strlen(lxcpath) + 20); | |
2633 | while (1) { | |
2634 | sprintf(fname, "%s/snap%d", lxcpath, i); | |
2635 | ret = stat(fname, &sb); | |
2636 | if (ret != 0) | |
2637 | return i; | |
2638 | i++; | |
2639 | } | |
2640 | } | |
2641 | ||
f0ca2726 | 2642 | static int lxcapi_snapshot(struct lxc_container *c, const char *commentfile) |
f5dd1d53 SH |
2643 | { |
2644 | int i, flags, ret; | |
2645 | struct lxc_container *c2; | |
2646 | char snappath[MAXPATHLEN], newname[20]; | |
2647 | ||
2648 | // /var/lib/lxc -> /var/lib/lxcsnaps \0 | |
2649 | ret = snprintf(snappath, MAXPATHLEN, "%ssnaps/%s", c->config_path, c->name); | |
2650 | if (ret < 0 || ret >= MAXPATHLEN) | |
2651 | return -1; | |
2652 | i = get_next_index(snappath, c->name); | |
2653 | ||
2654 | if (mkdir_p(snappath, 0755) < 0) { | |
2655 | ERROR("Failed to create snapshot directory %s", snappath); | |
2656 | return -1; | |
2657 | } | |
2658 | ||
2659 | ret = snprintf(newname, 20, "snap%d", i); | |
2660 | if (ret < 0 || ret >= 20) | |
2661 | return -1; | |
2662 | ||
2663 | flags = LXC_CLONE_SNAPSHOT | LXC_CLONE_KEEPMACADDR | LXC_CLONE_KEEPNAME; | |
2664 | c2 = c->clone(c, newname, snappath, flags, NULL, NULL, 0, NULL); | |
2665 | if (!c2) { | |
2666 | ERROR("clone of %s:%s failed\n", c->config_path, c->name); | |
2667 | return -1; | |
2668 | } | |
2669 | ||
2670 | lxc_container_put(c2); | |
2671 | ||
2672 | // Now write down the creation time | |
2673 | time_t timer; | |
2674 | char buffer[25]; | |
2675 | struct tm* tm_info; | |
025ed0f3 | 2676 | FILE *f; |
f5dd1d53 SH |
2677 | |
2678 | time(&timer); | |
2679 | tm_info = localtime(&timer); | |
2680 | ||
2681 | strftime(buffer, 25, "%Y:%m:%d %H:%M:%S", tm_info); | |
2682 | ||
2683 | char *dfnam = alloca(strlen(snappath) + strlen(newname) + 5); | |
2684 | sprintf(dfnam, "%s/%s/ts", snappath, newname); | |
025ed0f3 SH |
2685 | process_lock(); |
2686 | f = fopen(dfnam, "w"); | |
2687 | process_unlock(); | |
f5dd1d53 SH |
2688 | if (!f) { |
2689 | ERROR("Failed to open %s\n", dfnam); | |
2690 | return -1; | |
2691 | } | |
2692 | if (fprintf(f, "%s", buffer) < 0) { | |
2693 | SYSERROR("Writing timestamp"); | |
2694 | fclose(f); | |
2695 | return -1; | |
2696 | } | |
025ed0f3 SH |
2697 | process_lock(); |
2698 | ret = fclose(f); | |
2699 | process_unlock(); | |
2700 | if (ret != 0) { | |
f5dd1d53 SH |
2701 | SYSERROR("Writing timestamp"); |
2702 | return -1; | |
2703 | } | |
2704 | ||
2705 | if (commentfile) { | |
2706 | // $p / $name / comment \0 | |
2707 | int len = strlen(snappath) + strlen(newname) + 10; | |
2708 | char *path = alloca(len); | |
2709 | sprintf(path, "%s/%s/comment", snappath, newname); | |
2710 | return copy_file(commentfile, path) < 0 ? -1 : i; | |
2711 | } | |
2712 | ||
2713 | return i; | |
2714 | } | |
2715 | ||
2716 | static void lxcsnap_free(struct lxc_snapshot *s) | |
2717 | { | |
2718 | if (s->name) | |
2719 | free(s->name); | |
2720 | if (s->comment_pathname) | |
2721 | free(s->comment_pathname); | |
2722 | if (s->timestamp) | |
2723 | free(s->timestamp); | |
2724 | if (s->lxcpath) | |
2725 | free(s->lxcpath); | |
2726 | } | |
2727 | ||
2728 | static char *get_snapcomment_path(char* snappath, char *name) | |
2729 | { | |
2730 | // $snappath/$name/comment | |
2731 | int ret, len = strlen(snappath) + strlen(name) + 10; | |
2732 | char *s = malloc(len); | |
2733 | ||
2734 | if (s) { | |
2735 | ret = snprintf(s, len, "%s/%s/comment", snappath, name); | |
2736 | if (ret < 0 || ret >= len) { | |
2737 | free(s); | |
2738 | s = NULL; | |
2739 | } | |
2740 | } | |
2741 | return s; | |
2742 | } | |
2743 | ||
2744 | static char *get_timestamp(char* snappath, char *name) | |
2745 | { | |
2746 | char path[MAXPATHLEN], *s = NULL; | |
2747 | int ret, len; | |
2748 | FILE *fin; | |
2749 | ||
2750 | ret = snprintf(path, MAXPATHLEN, "%s/%s/ts", snappath, name); | |
2751 | if (ret < 0 || ret >= MAXPATHLEN) | |
2752 | return NULL; | |
025ed0f3 SH |
2753 | process_lock(); |
2754 | fin = fopen(path, "r"); | |
2755 | process_unlock(); | |
2756 | if (!fin) | |
f5dd1d53 SH |
2757 | return NULL; |
2758 | (void) fseek(fin, 0, SEEK_END); | |
2759 | len = ftell(fin); | |
2760 | (void) fseek(fin, 0, SEEK_SET); | |
2761 | if (len > 0) { | |
2762 | s = malloc(len+1); | |
2763 | if (s) { | |
2764 | s[len] = '\0'; | |
2765 | if (fread(s, 1, len, fin) != len) { | |
2766 | SYSERROR("reading timestamp"); | |
2767 | free(s); | |
2768 | s = NULL; | |
2769 | } | |
2770 | } | |
2771 | } | |
025ed0f3 | 2772 | process_lock(); |
f5dd1d53 | 2773 | fclose(fin); |
025ed0f3 | 2774 | process_unlock(); |
f5dd1d53 SH |
2775 | return s; |
2776 | } | |
2777 | ||
2778 | static int lxcapi_snapshot_list(struct lxc_container *c, struct lxc_snapshot **ret_snaps) | |
2779 | { | |
2780 | char snappath[MAXPATHLEN], path2[MAXPATHLEN]; | |
2781 | int dirlen, count = 0, ret; | |
2782 | struct dirent dirent, *direntp; | |
2783 | struct lxc_snapshot *snaps =NULL, *nsnaps; | |
2784 | DIR *dir; | |
2785 | ||
2786 | if (!c || !lxcapi_is_defined(c)) | |
2787 | return -1; | |
2788 | // snappath is ${lxcpath}snaps/${lxcname}/ | |
2789 | dirlen = snprintf(snappath, MAXPATHLEN, "%ssnaps/%s", c->config_path, c->name); | |
2790 | if (dirlen < 0 || dirlen >= MAXPATHLEN) { | |
2791 | ERROR("path name too long"); | |
2792 | return -1; | |
2793 | } | |
025ed0f3 SH |
2794 | process_lock(); |
2795 | dir = opendir(snappath); | |
2796 | process_unlock(); | |
2797 | if (!dir) { | |
f5dd1d53 SH |
2798 | INFO("failed to open %s - assuming no snapshots", snappath); |
2799 | return 0; | |
2800 | } | |
2801 | ||
2802 | while (!readdir_r(dir, &dirent, &direntp)) { | |
2803 | if (!direntp) | |
2804 | break; | |
2805 | ||
2806 | if (!strcmp(direntp->d_name, ".")) | |
2807 | continue; | |
2808 | ||
2809 | if (!strcmp(direntp->d_name, "..")) | |
2810 | continue; | |
2811 | ||
2812 | ret = snprintf(path2, MAXPATHLEN, "%s/%s/config", snappath, direntp->d_name); | |
2813 | if (ret < 0 || ret >= MAXPATHLEN) { | |
2814 | ERROR("pathname too long"); | |
2815 | goto out_free; | |
2816 | } | |
2817 | if (!file_exists(path2)) | |
2818 | continue; | |
2819 | nsnaps = realloc(snaps, (count + 1)*sizeof(*snaps)); | |
2820 | if (!nsnaps) { | |
2821 | SYSERROR("Out of memory"); | |
2822 | goto out_free; | |
2823 | } | |
2824 | snaps = nsnaps; | |
2825 | snaps[count].free = lxcsnap_free; | |
2826 | snaps[count].name = strdup(direntp->d_name); | |
2827 | if (!snaps[count].name) | |
2828 | goto out_free; | |
2829 | snaps[count].lxcpath = strdup(snappath); | |
2830 | if (!snaps[count].lxcpath) { | |
2831 | free(snaps[count].name); | |
2832 | goto out_free; | |
2833 | } | |
2834 | snaps[count].comment_pathname = get_snapcomment_path(snappath, direntp->d_name); | |
2835 | snaps[count].timestamp = get_timestamp(snappath, direntp->d_name); | |
2836 | count++; | |
2837 | } | |
2838 | ||
025ed0f3 | 2839 | process_lock(); |
f5dd1d53 SH |
2840 | if (closedir(dir)) |
2841 | WARN("failed to close directory"); | |
025ed0f3 | 2842 | process_unlock(); |
f5dd1d53 SH |
2843 | |
2844 | *ret_snaps = snaps; | |
2845 | return count; | |
2846 | ||
2847 | out_free: | |
2848 | if (snaps) { | |
2849 | int i; | |
2850 | for (i=0; i<count; i++) | |
2851 | lxcsnap_free(&snaps[i]); | |
2852 | free(snaps); | |
2853 | } | |
9baa57bd SH |
2854 | process_lock(); |
2855 | if (closedir(dir)) | |
2856 | WARN("failed to close directory"); | |
2857 | process_unlock(); | |
f5dd1d53 SH |
2858 | return -1; |
2859 | } | |
2860 | ||
f0ca2726 | 2861 | static bool lxcapi_snapshot_restore(struct lxc_container *c, const char *snapname, const char *newname) |
f5dd1d53 SH |
2862 | { |
2863 | char clonelxcpath[MAXPATHLEN]; | |
2864 | int ret; | |
2865 | struct lxc_container *snap, *rest; | |
2866 | struct bdev *bdev; | |
2867 | bool b = false; | |
2868 | ||
2869 | if (!c || !c->name || !c->config_path) | |
2870 | return false; | |
2871 | ||
2872 | bdev = bdev_init(c->lxc_conf->rootfs.path, c->lxc_conf->rootfs.mount, NULL); | |
2873 | if (!bdev) { | |
2874 | ERROR("Failed to find original backing store type"); | |
2875 | return false; | |
2876 | } | |
2877 | ||
2878 | if (!newname) | |
2879 | newname = c->name; | |
2880 | if (strcmp(c->name, newname) == 0) { | |
2881 | if (!lxcapi_destroy(c)) { | |
2882 | ERROR("Could not destroy existing container %s", newname); | |
2883 | bdev_put(bdev); | |
2884 | return false; | |
2885 | } | |
2886 | } | |
2887 | ret = snprintf(clonelxcpath, MAXPATHLEN, "%ssnaps/%s", c->config_path, c->name); | |
2888 | if (ret < 0 || ret >= MAXPATHLEN) { | |
2889 | bdev_put(bdev); | |
2890 | return false; | |
2891 | } | |
2892 | // how should we lock this? | |
2893 | ||
2894 | snap = lxc_container_new(snapname, clonelxcpath); | |
2895 | if (!snap || !lxcapi_is_defined(snap)) { | |
2896 | ERROR("Could not open snapshot %s", snapname); | |
2897 | if (snap) lxc_container_put(snap); | |
2898 | bdev_put(bdev); | |
2899 | return false; | |
2900 | } | |
2901 | ||
2902 | rest = lxcapi_clone(snap, newname, c->config_path, 0, bdev->type, NULL, 0, NULL); | |
2903 | bdev_put(bdev); | |
2904 | if (rest && lxcapi_is_defined(rest)) | |
2905 | b = true; | |
2906 | if (rest) | |
2907 | lxc_container_put(rest); | |
2908 | lxc_container_put(snap); | |
2909 | return b; | |
2910 | } | |
2911 | ||
f0ca2726 | 2912 | static bool lxcapi_snapshot_destroy(struct lxc_container *c, const char *snapname) |
771d96b3 ÇO |
2913 | { |
2914 | int ret; | |
2915 | char clonelxcpath[MAXPATHLEN]; | |
2916 | struct lxc_container *snap = NULL; | |
2917 | ||
2918 | if (!c || !c->name || !c->config_path) | |
2919 | return false; | |
2920 | ||
2921 | ret = snprintf(clonelxcpath, MAXPATHLEN, "%ssnaps/%s", c->config_path, c->name); | |
2922 | if (ret < 0 || ret >= MAXPATHLEN) | |
2923 | goto err; | |
2924 | ||
2925 | snap = lxc_container_new(snapname, clonelxcpath); | |
2926 | if (!snap || !lxcapi_is_defined(snap)) { | |
2927 | ERROR("Could not find snapshot %s", snapname); | |
2928 | goto err; | |
2929 | } | |
2930 | ||
2931 | if (!lxcapi_destroy(snap)) { | |
2932 | ERROR("Could not destroy snapshot %s", snapname); | |
2933 | goto err; | |
2934 | } | |
2935 | lxc_container_put(snap); | |
2936 | ||
2937 | return true; | |
2938 | err: | |
2939 | if (snap) | |
2940 | lxc_container_put(snap); | |
2941 | return false; | |
2942 | } | |
2943 | ||
b494d2dd SH |
2944 | static bool lxcapi_may_control(struct lxc_container *c) |
2945 | { | |
2946 | return lxc_try_cmd(c->name, c->config_path) == 0; | |
2947 | } | |
2948 | ||
f0ca2726 | 2949 | static bool add_remove_device_node(struct lxc_container *c, const char *src_path, const char *dest_path, bool add) |
a9a0ed90 ÇO |
2950 | { |
2951 | int ret; | |
2952 | struct stat st; | |
2953 | char path[MAXPATHLEN]; | |
2954 | char value[MAX_BUFFER]; | |
f0ca2726 JH |
2955 | char *directory_path = NULL; |
2956 | const char *p; | |
a9a0ed90 ÇO |
2957 | |
2958 | /* make sure container is running */ | |
2959 | if (!c->is_running(c)) { | |
2960 | ERROR("container is not running"); | |
2961 | goto out; | |
2962 | } | |
2963 | ||
2964 | /* use src_path if dest_path is NULL otherwise use dest_path */ | |
2965 | p = dest_path ? dest_path : src_path; | |
2966 | ||
2967 | /* prepare the path */ | |
2968 | ret = snprintf(path, MAXPATHLEN, "/proc/%d/root/%s", c->init_pid(c), p); | |
2969 | if (ret < 0 || ret >= MAXPATHLEN) | |
2970 | goto out; | |
2971 | remove_trailing_slashes(path); | |
2972 | ||
2973 | p = add ? src_path : path; | |
2974 | /* make sure we can access p */ | |
2975 | if(access(p, F_OK) < 0 || stat(p, &st) < 0) | |
2976 | goto out; | |
2977 | ||
2978 | /* continue if path is character device or block device */ | |
c6a9b0d7 | 2979 | if (S_ISCHR(st.st_mode)) |
a9a0ed90 | 2980 | ret = snprintf(value, MAX_BUFFER, "c %d:%d rwm", major(st.st_rdev), minor(st.st_rdev)); |
c6a9b0d7 | 2981 | else if (S_ISBLK(st.st_mode)) |
a9a0ed90 ÇO |
2982 | ret = snprintf(value, MAX_BUFFER, "b %d:%d rwm", major(st.st_rdev), minor(st.st_rdev)); |
2983 | else | |
2984 | goto out; | |
2985 | ||
2986 | /* check snprintf return code */ | |
2987 | if (ret < 0 || ret >= MAX_BUFFER) | |
2988 | goto out; | |
2989 | ||
2990 | directory_path = dirname(strdup(path)); | |
2991 | /* remove path and directory_path (if empty) */ | |
2992 | if(access(path, F_OK) == 0) { | |
2993 | if (unlink(path) < 0) { | |
2994 | ERROR("unlink failed"); | |
2995 | goto out; | |
2996 | } | |
2997 | if (rmdir(directory_path) < 0 && errno != ENOTEMPTY) { | |
2998 | ERROR("rmdir failed"); | |
2999 | goto out; | |
3000 | } | |
3001 | } | |
3002 | ||
3003 | if (add) { | |
3004 | /* create the missing directories */ | |
3005 | if (mkdir_p(directory_path, 0755) < 0) { | |
3006 | ERROR("failed to create directory"); | |
3007 | goto out; | |
3008 | } | |
3009 | ||
3010 | /* create the device node */ | |
3011 | if (mknod(path, st.st_mode, st.st_rdev) < 0) { | |
3012 | ERROR("mknod failed"); | |
3013 | goto out; | |
3014 | } | |
3015 | ||
3016 | /* add device node to device list */ | |
3017 | if (!c->set_cgroup_item(c, "devices.allow", value)) { | |
3018 | ERROR("set_cgroup_item failed while adding the device node"); | |
3019 | goto out; | |
3020 | } | |
3021 | } else { | |
3022 | /* remove device node from device list */ | |
3023 | if (!c->set_cgroup_item(c, "devices.deny", value)) { | |
3024 | ERROR("set_cgroup_item failed while removing the device node"); | |
3025 | goto out; | |
3026 | } | |
3027 | } | |
3028 | return true; | |
3029 | out: | |
3030 | if (directory_path) | |
3031 | free(directory_path); | |
3032 | return false; | |
3033 | } | |
3034 | ||
f0ca2726 | 3035 | static bool lxcapi_add_device_node(struct lxc_container *c, const char *src_path, const char *dest_path) |
a9a0ed90 ÇO |
3036 | { |
3037 | return add_remove_device_node(c, src_path, dest_path, true); | |
3038 | } | |
3039 | ||
f0ca2726 | 3040 | static bool lxcapi_remove_device_node(struct lxc_container *c, const char *src_path, const char *dest_path) |
a9a0ed90 ÇO |
3041 | { |
3042 | return add_remove_device_node(c, src_path, dest_path, false); | |
3043 | } | |
3044 | ||
a0e93eeb CS |
3045 | static int lxcapi_attach_run_waitl(struct lxc_container *c, lxc_attach_options_t *options, const char *program, const char *arg, ...) |
3046 | { | |
3047 | va_list ap; | |
3048 | const char **argv; | |
3049 | int ret; | |
3050 | ||
3051 | if (!c) | |
3052 | return -1; | |
3053 | ||
3054 | va_start(ap, arg); | |
3055 | argv = lxc_va_arg_list_to_argv_const(ap, 1); | |
3056 | va_end(ap); | |
3057 | ||
3058 | if (!argv) { | |
3059 | ERROR("Memory allocation error."); | |
3060 | return -1; | |
3061 | } | |
3062 | argv[0] = arg; | |
3063 | ||
3064 | ret = lxcapi_attach_run_wait(c, options, program, (const char * const *)argv); | |
3065 | free((void*)argv); | |
3066 | return ret; | |
3067 | } | |
3068 | ||
afeecbba | 3069 | struct lxc_container *lxc_container_new(const char *name, const char *configpath) |
72d0e1cb SG |
3070 | { |
3071 | struct lxc_container *c; | |
72d0e1cb SG |
3072 | |
3073 | c = malloc(sizeof(*c)); | |
3074 | if (!c) { | |
3075 | fprintf(stderr, "failed to malloc lxc_container\n"); | |
3076 | return NULL; | |
3077 | } | |
3078 | memset(c, 0, sizeof(*c)); | |
3079 | ||
afeecbba SH |
3080 | if (configpath) |
3081 | c->config_path = strdup(configpath); | |
3082 | else | |
67e571de | 3083 | c->config_path = strdup(default_lxc_path()); |
afeecbba | 3084 | |
2a59a681 SH |
3085 | if (!c->config_path) { |
3086 | fprintf(stderr, "Out of memory"); | |
3087 | goto err; | |
3088 | } | |
3089 | ||
f5dd1d53 | 3090 | remove_trailing_slashes(c->config_path); |
72d0e1cb SG |
3091 | c->name = malloc(strlen(name)+1); |
3092 | if (!c->name) { | |
3093 | fprintf(stderr, "Error allocating lxc_container name\n"); | |
3094 | goto err; | |
3095 | } | |
3096 | strcpy(c->name, name); | |
3097 | ||
3098 | c->numthreads = 1; | |
df271a59 | 3099 | if (!(c->slock = lxc_newlock(c->config_path, name))) { |
72d0e1cb SG |
3100 | fprintf(stderr, "failed to create lock\n"); |
3101 | goto err; | |
3102 | } | |
3103 | ||
df271a59 | 3104 | if (!(c->privlock = lxc_newlock(NULL, NULL))) { |
72d0e1cb SG |
3105 | fprintf(stderr, "failed to alloc privlock\n"); |
3106 | goto err; | |
3107 | } | |
3108 | ||
afeecbba | 3109 | if (!set_config_filename(c)) { |
72d0e1cb SG |
3110 | fprintf(stderr, "Error allocating config file pathname\n"); |
3111 | goto err; | |
3112 | } | |
72d0e1cb SG |
3113 | |
3114 | if (file_exists(c->configfile)) | |
3115 | lxcapi_load_config(c, NULL); | |
3116 | ||
3e625e2d SH |
3117 | if (ongoing_create(c) == 2) { |
3118 | ERROR("Error: %s creation was not completed", c->name); | |
1897e3bc | 3119 | lxcapi_destroy(c); |
4df7f012 | 3120 | lxcapi_clear_config(c); |
3e625e2d SH |
3121 | } |
3122 | ||
72d0e1cb SG |
3123 | // assign the member functions |
3124 | c->is_defined = lxcapi_is_defined; | |
3125 | c->state = lxcapi_state; | |
3126 | c->is_running = lxcapi_is_running; | |
3127 | c->freeze = lxcapi_freeze; | |
3128 | c->unfreeze = lxcapi_unfreeze; | |
0115f8fd | 3129 | c->console = lxcapi_console; |
b5159817 | 3130 | c->console_getfd = lxcapi_console_getfd; |
72d0e1cb SG |
3131 | c->init_pid = lxcapi_init_pid; |
3132 | c->load_config = lxcapi_load_config; | |
3133 | c->want_daemonize = lxcapi_want_daemonize; | |
130a1888 | 3134 | c->want_close_all_fds = lxcapi_want_close_all_fds; |
72d0e1cb SG |
3135 | c->start = lxcapi_start; |
3136 | c->startl = lxcapi_startl; | |
3137 | c->stop = lxcapi_stop; | |
3138 | c->config_file_name = lxcapi_config_file_name; | |
3139 | c->wait = lxcapi_wait; | |
3140 | c->set_config_item = lxcapi_set_config_item; | |
3141 | c->destroy = lxcapi_destroy; | |
3142 | c->save_config = lxcapi_save_config; | |
3143 | c->get_keys = lxcapi_get_keys; | |
3144 | c->create = lxcapi_create; | |
3145 | c->createl = lxcapi_createl; | |
3146 | c->shutdown = lxcapi_shutdown; | |
3e625e2d | 3147 | c->reboot = lxcapi_reboot; |
4df7f012 | 3148 | c->clear_config = lxcapi_clear_config; |
72d0e1cb SG |
3149 | c->clear_config_item = lxcapi_clear_config_item; |
3150 | c->get_config_item = lxcapi_get_config_item; | |
794dd120 SH |
3151 | c->get_cgroup_item = lxcapi_get_cgroup_item; |
3152 | c->set_cgroup_item = lxcapi_set_cgroup_item; | |
2a59a681 SH |
3153 | c->get_config_path = lxcapi_get_config_path; |
3154 | c->set_config_path = lxcapi_set_config_path; | |
9be53773 | 3155 | c->clone = lxcapi_clone; |
799f29ab | 3156 | c->get_interfaces = lxcapi_get_interfaces; |
9c83a661 | 3157 | c->get_ips = lxcapi_get_ips; |
a0e93eeb CS |
3158 | c->attach = lxcapi_attach; |
3159 | c->attach_run_wait = lxcapi_attach_run_wait; | |
3160 | c->attach_run_waitl = lxcapi_attach_run_waitl; | |
f5dd1d53 SH |
3161 | c->snapshot = lxcapi_snapshot; |
3162 | c->snapshot_list = lxcapi_snapshot_list; | |
3163 | c->snapshot_restore = lxcapi_snapshot_restore; | |
771d96b3 | 3164 | c->snapshot_destroy = lxcapi_snapshot_destroy; |
b494d2dd | 3165 | c->may_control = lxcapi_may_control; |
a9a0ed90 ÇO |
3166 | c->add_device_node = lxcapi_add_device_node; |
3167 | c->remove_device_node = lxcapi_remove_device_node; | |
72d0e1cb SG |
3168 | |
3169 | /* we'll allow the caller to update these later */ | |
ab1bf971 | 3170 | if (lxc_log_init(NULL, "none", NULL, "lxc_container", 0, c->config_path)) { |
72d0e1cb SG |
3171 | fprintf(stderr, "failed to open log\n"); |
3172 | goto err; | |
3173 | } | |
3174 | ||
72d0e1cb SG |
3175 | return c; |
3176 | ||
3177 | err: | |
3178 | lxc_container_free(c); | |
3179 | return NULL; | |
3180 | } | |
3181 | ||
4a7c7daa | 3182 | int lxc_get_wait_states(const char **states) |
72d0e1cb SG |
3183 | { |
3184 | int i; | |
3185 | ||
3186 | if (states) | |
3187 | for (i=0; i<MAX_STATE; i++) | |
3188 | states[i] = lxc_state2str(i); | |
3189 | return MAX_STATE; | |
3190 | } | |
a41f104b | 3191 | |
a41f104b SH |
3192 | /* |
3193 | * These next two could probably be done smarter with reusing a common function | |
3194 | * with different iterators and tests... | |
3195 | */ | |
3196 | int list_defined_containers(const char *lxcpath, char ***names, struct lxc_container ***cret) | |
3197 | { | |
3198 | DIR *dir; | |
3199 | int i, cfound = 0, nfound = 0; | |
3200 | struct dirent dirent, *direntp; | |
3201 | struct lxc_container *c; | |
3202 | ||
3203 | if (!lxcpath) | |
3204 | lxcpath = default_lxc_path(); | |
3205 | ||
3206 | process_lock(); | |
3207 | dir = opendir(lxcpath); | |
3208 | process_unlock(); | |
3209 | ||
3210 | if (!dir) { | |
3211 | SYSERROR("opendir on lxcpath"); | |
3212 | return -1; | |
3213 | } | |
3214 | ||
3215 | if (cret) | |
3216 | *cret = NULL; | |
3217 | if (names) | |
3218 | *names = NULL; | |
3219 | ||
3220 | while (!readdir_r(dir, &dirent, &direntp)) { | |
3221 | if (!direntp) | |
3222 | break; | |
3223 | if (!strcmp(direntp->d_name, ".")) | |
3224 | continue; | |
3225 | if (!strcmp(direntp->d_name, "..")) | |
3226 | continue; | |
3227 | ||
3228 | if (!config_file_exists(lxcpath, direntp->d_name)) | |
3229 | continue; | |
3230 | ||
3231 | if (names) { | |
9c88ff1f | 3232 | if (!add_to_array(names, direntp->d_name, cfound)) |
a41f104b SH |
3233 | goto free_bad; |
3234 | } | |
3235 | cfound++; | |
3236 | ||
3237 | if (!cret) { | |
3238 | nfound++; | |
3239 | continue; | |
3240 | } | |
3241 | ||
3242 | c = lxc_container_new(direntp->d_name, lxcpath); | |
3243 | if (!c) { | |
3244 | INFO("Container %s:%s has a config but could not be loaded", | |
3245 | lxcpath, direntp->d_name); | |
3246 | if (names) | |
9c88ff1f ÇO |
3247 | if(!remove_from_array(names, direntp->d_name, cfound--)) |
3248 | goto free_bad; | |
a41f104b SH |
3249 | continue; |
3250 | } | |
3251 | if (!lxcapi_is_defined(c)) { | |
3252 | INFO("Container %s:%s has a config but is not defined", | |
3253 | lxcpath, direntp->d_name); | |
3254 | if (names) | |
9c88ff1f ÇO |
3255 | if(!remove_from_array(names, direntp->d_name, cfound--)) |
3256 | goto free_bad; | |
a41f104b SH |
3257 | lxc_container_put(c); |
3258 | continue; | |
3259 | } | |
3260 | ||
2871830a | 3261 | if (!add_to_clist(cret, c, nfound, true)) { |
a41f104b SH |
3262 | lxc_container_put(c); |
3263 | goto free_bad; | |
3264 | } | |
3265 | nfound++; | |
3266 | } | |
3267 | ||
3268 | process_lock(); | |
3269 | closedir(dir); | |
3270 | process_unlock(); | |
3271 | return nfound; | |
3272 | ||
3273 | free_bad: | |
3274 | if (names && *names) { | |
3275 | for (i=0; i<cfound; i++) | |
3276 | free((*names)[i]); | |
3277 | free(*names); | |
3278 | } | |
3279 | if (cret && *cret) { | |
3280 | for (i=0; i<nfound; i++) | |
3281 | lxc_container_put((*cret)[i]); | |
3282 | free(*cret); | |
3283 | } | |
3284 | process_lock(); | |
3285 | closedir(dir); | |
3286 | process_unlock(); | |
3287 | return -1; | |
3288 | } | |
3289 | ||
148a9d27 DE |
3290 | int list_active_containers(const char *lxcpath, char ***nret, |
3291 | struct lxc_container ***cret) | |
a41f104b | 3292 | { |
148a9d27 | 3293 | int i, ret = -1, cret_cnt = 0, ct_name_cnt = 0; |
a41f104b SH |
3294 | int lxcpath_len; |
3295 | char *line = NULL; | |
148a9d27 | 3296 | char **ct_name = NULL; |
a41f104b SH |
3297 | size_t len = 0; |
3298 | struct lxc_container *c; | |
3299 | ||
3300 | if (!lxcpath) | |
3301 | lxcpath = default_lxc_path(); | |
3302 | lxcpath_len = strlen(lxcpath); | |
3303 | ||
3304 | if (cret) | |
3305 | *cret = NULL; | |
148a9d27 DE |
3306 | if (nret) |
3307 | *nret = NULL; | |
a41f104b SH |
3308 | |
3309 | process_lock(); | |
3310 | FILE *f = fopen("/proc/net/unix", "r"); | |
3311 | process_unlock(); | |
3312 | if (!f) | |
3313 | return -1; | |
3314 | ||
3315 | while (getline(&line, &len, f) != -1) { | |
0f8f9c8a | 3316 | char *p = strrchr(line, ' '), *p2; |
a41f104b SH |
3317 | if (!p) |
3318 | continue; | |
3319 | p++; | |
3320 | if (*p != 0x40) | |
3321 | continue; | |
3322 | p++; | |
3323 | if (strncmp(p, lxcpath, lxcpath_len) != 0) | |
3324 | continue; | |
3325 | p += lxcpath_len; | |
3326 | while (*p == '/') | |
3327 | p++; | |
3328 | ||
3329 | // Now p is the start of lxc_name | |
3330 | p2 = index(p, '/'); | |
3331 | if (!p2 || strncmp(p2, "/command", 8) != 0) | |
3332 | continue; | |
3333 | *p2 = '\0'; | |
3334 | ||
148a9d27 | 3335 | if (array_contains(&ct_name, p, ct_name_cnt)) |
9c88ff1f ÇO |
3336 | continue; |
3337 | ||
148a9d27 DE |
3338 | if (!add_to_array(&ct_name, p, ct_name_cnt)) |
3339 | goto free_cret_list; | |
9c88ff1f | 3340 | |
148a9d27 | 3341 | ct_name_cnt++; |
a41f104b | 3342 | |
148a9d27 | 3343 | if (!cret) |
a41f104b | 3344 | continue; |
a41f104b SH |
3345 | |
3346 | c = lxc_container_new(p, lxcpath); | |
3347 | if (!c) { | |
3348 | INFO("Container %s:%s is running but could not be loaded", | |
3349 | lxcpath, p); | |
148a9d27 | 3350 | remove_from_array(&ct_name, p, ct_name_cnt--); |
a41f104b SH |
3351 | continue; |
3352 | } | |
3353 | ||
3354 | /* | |
3355 | * If this is an anonymous container, then is_defined *can* | |
3356 | * return false. So we don't do that check. Count on the | |
3357 | * fact that the command socket exists. | |
3358 | */ | |
3359 | ||
148a9d27 | 3360 | if (!add_to_clist(cret, c, cret_cnt, true)) { |
a41f104b | 3361 | lxc_container_put(c); |
148a9d27 | 3362 | goto free_cret_list; |
a41f104b | 3363 | } |
148a9d27 | 3364 | cret_cnt++; |
a41f104b SH |
3365 | } |
3366 | ||
148a9d27 DE |
3367 | assert(!nret || !cret || cret_cnt == ct_name_cnt); |
3368 | ret = ct_name_cnt; | |
3369 | if (nret) | |
3370 | *nret = ct_name; | |
3371 | else | |
3372 | goto free_ct_name; | |
3373 | goto out; | |
a41f104b | 3374 | |
148a9d27 | 3375 | free_cret_list: |
a41f104b | 3376 | if (cret && *cret) { |
148a9d27 | 3377 | for (i = 0; i < cret_cnt; i++) |
a41f104b SH |
3378 | lxc_container_put((*cret)[i]); |
3379 | free(*cret); | |
3380 | } | |
148a9d27 DE |
3381 | |
3382 | free_ct_name: | |
3383 | if (ct_name) { | |
3384 | for (i = 0; i < ct_name_cnt; i++) | |
3385 | free(ct_name[i]); | |
3386 | free(ct_name); | |
3387 | } | |
3388 | ||
3389 | out: | |
e853a32d ÇO |
3390 | if (line) |
3391 | free(line); | |
3392 | ||
a41f104b SH |
3393 | process_lock(); |
3394 | fclose(f); | |
3395 | process_unlock(); | |
148a9d27 | 3396 | return ret; |
a41f104b | 3397 | } |
2871830a DE |
3398 | |
3399 | int list_all_containers(const char *lxcpath, char ***nret, | |
3400 | struct lxc_container ***cret) | |
3401 | { | |
3402 | int i, ret, active_cnt, ct_cnt, ct_list_cnt; | |
3403 | char **active_name; | |
3404 | char **ct_name; | |
3405 | struct lxc_container **ct_list = NULL; | |
3406 | ||
3407 | ct_cnt = list_defined_containers(lxcpath, &ct_name, NULL); | |
3408 | if (ct_cnt < 0) | |
3409 | return ct_cnt; | |
3410 | ||
3411 | active_cnt = list_active_containers(lxcpath, &active_name, NULL); | |
3412 | if (active_cnt < 0) { | |
3413 | ret = active_cnt; | |
3414 | goto free_ct_name; | |
3415 | } | |
3416 | ||
3417 | for (i = 0; i < active_cnt; i++) { | |
3418 | if (!array_contains(&ct_name, active_name[i], ct_cnt)) { | |
3419 | if (!add_to_array(&ct_name, active_name[i], ct_cnt)) { | |
3420 | ret = -1; | |
3421 | goto free_active_name; | |
3422 | } | |
3423 | ct_cnt++; | |
3424 | } | |
3425 | free(active_name[i]); | |
3426 | active_name[i] = NULL; | |
3427 | } | |
3428 | free(active_name); | |
3429 | active_name = NULL; | |
3430 | active_cnt = 0; | |
3431 | ||
3432 | for (i = 0, ct_list_cnt = 0; i < ct_cnt && cret; i++) { | |
3433 | struct lxc_container *c; | |
3434 | ||
3435 | c = lxc_container_new(ct_name[i], lxcpath); | |
3436 | if (!c) { | |
3437 | WARN("Container %s:%s could not be loaded", lxcpath, ct_name[i]); | |
3438 | remove_from_array(&ct_name, ct_name[i], ct_cnt--); | |
3439 | continue; | |
3440 | } | |
3441 | ||
3442 | if (!add_to_clist(&ct_list, c, ct_list_cnt, false)) { | |
3443 | lxc_container_put(c); | |
3444 | ret = -1; | |
3445 | goto free_ct_list; | |
3446 | } | |
3447 | ct_list_cnt++; | |
3448 | } | |
3449 | ||
3450 | if (cret) | |
3451 | *cret = ct_list; | |
3452 | ||
3453 | if (nret) | |
3454 | *nret = ct_name; | |
3455 | else { | |
3456 | ret = ct_cnt; | |
3457 | goto free_ct_name; | |
3458 | } | |
3459 | return ct_cnt; | |
3460 | ||
3461 | free_ct_list: | |
3462 | for (i = 0; i < ct_list_cnt; i++) { | |
3463 | lxc_container_put(ct_list[i]); | |
3464 | } | |
3465 | if (ct_list) | |
3466 | free(ct_list); | |
3467 | ||
3468 | free_active_name: | |
3469 | for (i = 0; i < active_cnt; i++) { | |
3470 | if (active_name[i]) | |
3471 | free(active_name[i]); | |
3472 | } | |
3473 | if (active_name) | |
3474 | free(active_name); | |
3475 | ||
3476 | free_ct_name: | |
3477 | for (i = 0; i < ct_cnt; i++) { | |
3478 | free(ct_name[i]); | |
3479 | } | |
3480 | free(ct_name); | |
3481 | return ret; | |
3482 | } |