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Commit | Line | Data |
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72d0e1cb SG |
1 | /* liblxcapi |
2 | * | |
3 | * Copyright © 2012 Serge Hallyn <serge.hallyn@ubuntu.com>. | |
4 | * Copyright © 2012 Canonical Ltd. | |
5 | * | |
d75462e4 SH |
6 | * This library is free software; you can redistribute it and/or |
7 | * modify it under the terms of the GNU Lesser General Public | |
8 | * License as published by the Free Software Foundation; either | |
9 | * version 2.1 of the License, or (at your option) any later version. | |
10 | ||
11 | * This library is distributed in the hope that it will be useful, | |
12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
14 | * Lesser General Public License for more details. | |
15 | ||
16 | * You should have received a copy of the GNU Lesser General Public | |
17 | * License along with this library; if not, write to the Free Software | |
18 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA | |
72d0e1cb SG |
19 | */ |
20 | ||
9be53773 | 21 | #define _GNU_SOURCE |
38683db4 | 22 | #include <dirent.h> |
9be53773 | 23 | #include <errno.h> |
93dc5327 | 24 | #include <fcntl.h> |
38683db4 | 25 | #include <grp.h> |
f2363e38 | 26 | #include <libgen.h> |
38683db4 CB |
27 | #include <pthread.h> |
28 | #include <sched.h> | |
29 | #include <stdarg.h> | |
d659597e | 30 | #include <stdint.h> |
9fc7f8c0 | 31 | #include <stdio.h> |
38683db4 CB |
32 | #include <unistd.h> |
33 | #include <arpa/inet.h> | |
66c1f8c2 | 34 | #include <sys/sysmacros.h> |
38683db4 CB |
35 | #include <sys/mman.h> |
36 | #include <sys/mount.h> | |
5f7eba0b | 37 | #include <sys/syscall.h> |
38683db4 CB |
38 | #include <sys/types.h> |
39 | #include <sys/wait.h> | |
f2363e38 | 40 | |
5e5576a4 | 41 | #include "af_unix.h" |
38683db4 | 42 | #include "attach.h" |
38683db4 | 43 | #include "cgroup.h" |
72d0e1cb | 44 | #include "conf.h" |
38683db4 CB |
45 | #include "config.h" |
46 | #include "commands.h" | |
92e35018 | 47 | #include "commands_utils.h" |
72d0e1cb | 48 | #include "confile.h" |
953fe44f | 49 | #include "confile_legacy.h" |
4222a9f4 | 50 | #include "confile_utils.h" |
b5159817 | 51 | #include "console.h" |
e29fe1dd | 52 | #include "criu.h" |
72d0e1cb | 53 | #include "log.h" |
38683db4 CB |
54 | #include "lxc.h" |
55 | #include "lxccontainer.h" | |
56 | #include "lxclock.h" | |
f2363e38 ÇO |
57 | #include "monitor.h" |
58 | #include "namespace.h" | |
fed29fad | 59 | #include "network.h" |
aa460476 | 60 | #include "start.h" |
38683db4 | 61 | #include "state.h" |
28d832c4 CB |
62 | #include "storage.h" |
63 | #include "storage/btrfs.h" | |
64 | #include "storage/overlay.h" | |
65 | #include "sync.h" | |
38683db4 CB |
66 | #include "utils.h" |
67 | #include "version.h" | |
4ba0d9af | 68 | |
af6824fc ST |
69 | /* major()/minor() */ |
70 | #ifdef MAJOR_IN_MKDEV | |
71 | # include <sys/mkdev.h> | |
72 | #endif | |
af6824fc | 73 | |
4ba0d9af | 74 | #if HAVE_IFADDRS_H |
9c83a661 | 75 | #include <ifaddrs.h> |
4ba0d9af SG |
76 | #else |
77 | #include <../include/ifaddrs.h> | |
78 | #endif | |
72d0e1cb | 79 | |
684f79a5 SG |
80 | #if IS_BIONIC |
81 | #include <../include/lxcmntent.h> | |
82 | #else | |
83 | #include <mntent.h> | |
84 | #endif | |
85 | ||
a9a0ed90 ÇO |
86 | #define MAX_BUFFER 4096 |
87 | ||
c868b261 ÇO |
88 | #define NOT_SUPPORTED_ERROR "the requested function %s is not currently supported with unprivileged containers" |
89 | ||
5f7eba0b SG |
90 | /* Define faccessat() if missing from the C library */ |
91 | #ifndef HAVE_FACCESSAT | |
92 | static int faccessat(int __fd, const char *__file, int __type, int __flag) | |
93 | { | |
94 | #ifdef __NR_faccessat | |
95 | return syscall(__NR_faccessat, __fd, __file, __type, __flag); | |
96 | #else | |
97 | errno = ENOSYS; | |
98 | return -1; | |
99 | #endif | |
100 | } | |
101 | #endif | |
102 | ||
72d0e1cb SG |
103 | lxc_log_define(lxc_container, lxc); |
104 | ||
858377e4 SH |
105 | static bool do_lxcapi_destroy(struct lxc_container *c); |
106 | static const char *lxcapi_get_config_path(struct lxc_container *c); | |
107 | #define do_lxcapi_get_config_path(c) lxcapi_get_config_path(c) | |
108 | static bool do_lxcapi_set_config_item(struct lxc_container *c, const char *key, const char *v); | |
17a367d8 CB |
109 | static bool container_destroy(struct lxc_container *c, |
110 | struct lxc_storage *storage); | |
858377e4 SH |
111 | static bool get_snappath_dir(struct lxc_container *c, char *snappath); |
112 | static bool lxcapi_snapshot_destroy_all(struct lxc_container *c); | |
113 | static bool do_lxcapi_save_config(struct lxc_container *c, const char *alt_file); | |
114 | ||
a41f104b SH |
115 | static bool config_file_exists(const char *lxcpath, const char *cname) |
116 | { | |
117 | /* $lxcpath + '/' + $cname + '/config' + \0 */ | |
118 | int ret, len = strlen(lxcpath) + strlen(cname) + 9; | |
119 | char *fname = alloca(len); | |
120 | ||
121 | ret = snprintf(fname, len, "%s/%s/config", lxcpath, cname); | |
122 | if (ret < 0 || ret >= len) | |
123 | return false; | |
124 | ||
125 | return file_exists(fname); | |
126 | } | |
127 | ||
3e625e2d SH |
128 | /* |
129 | * A few functions to help detect when a container creation failed. | |
130 | * If a container creation was killed partway through, then trying | |
131 | * to actually start that container could harm the host. We detect | |
132 | * this by creating a 'partial' file under the container directory, | |
133 | * and keeping an advisory lock. When container creation completes, | |
134 | * we remove that file. When we load or try to start a container, if | |
135 | * we find that file, without a flock, we remove the container. | |
136 | */ | |
74a3920a | 137 | static int ongoing_create(struct lxc_container *c) |
3e625e2d SH |
138 | { |
139 | int len = strlen(c->config_path) + strlen(c->name) + 10; | |
140 | char *path = alloca(len); | |
141 | int fd, ret; | |
93dc5327 SH |
142 | struct flock lk; |
143 | ||
3e625e2d SH |
144 | ret = snprintf(path, len, "%s/%s/partial", c->config_path, c->name); |
145 | if (ret < 0 || ret >= len) { | |
146 | ERROR("Error writing partial pathname"); | |
147 | return -1; | |
148 | } | |
149 | ||
150 | if (!file_exists(path)) | |
151 | return 0; | |
025ed0f3 | 152 | fd = open(path, O_RDWR); |
025ed0f3 | 153 | if (fd < 0) { |
3e625e2d SH |
154 | // give benefit of the doubt |
155 | SYSERROR("Error opening partial file"); | |
3e625e2d SH |
156 | return 0; |
157 | } | |
93dc5327 SH |
158 | lk.l_type = F_WRLCK; |
159 | lk.l_whence = SEEK_SET; | |
160 | lk.l_start = 0; | |
161 | lk.l_len = 0; | |
162 | lk.l_pid = -1; | |
163 | if (fcntl(fd, F_GETLK, &lk) == 0 && lk.l_pid != -1) { | |
3e625e2d SH |
164 | // create is still ongoing |
165 | close(fd); | |
3e625e2d SH |
166 | return 1; |
167 | } | |
168 | // create completed but partial is still there. | |
169 | close(fd); | |
3e625e2d SH |
170 | return 2; |
171 | } | |
172 | ||
74a3920a | 173 | static int create_partial(struct lxc_container *c) |
3e625e2d SH |
174 | { |
175 | // $lxcpath + '/' + $name + '/partial' + \0 | |
176 | int len = strlen(c->config_path) + strlen(c->name) + 10; | |
177 | char *path = alloca(len); | |
178 | int fd, ret; | |
93dc5327 SH |
179 | struct flock lk; |
180 | ||
3e625e2d SH |
181 | ret = snprintf(path, len, "%s/%s/partial", c->config_path, c->name); |
182 | if (ret < 0 || ret >= len) { | |
183 | ERROR("Error writing partial pathname"); | |
184 | return -1; | |
185 | } | |
93dc5327 | 186 | if ((fd=open(path, O_RDWR | O_CREAT | O_EXCL, 0755)) < 0) { |
740fe426 | 187 | SYSERROR("Error creating partial file"); |
3e625e2d SH |
188 | return -1; |
189 | } | |
93dc5327 SH |
190 | lk.l_type = F_WRLCK; |
191 | lk.l_whence = SEEK_SET; | |
192 | lk.l_start = 0; | |
193 | lk.l_len = 0; | |
194 | if (fcntl(fd, F_SETLKW, &lk) < 0) { | |
3e625e2d SH |
195 | SYSERROR("Error locking partial file %s", path); |
196 | close(fd); | |
3e625e2d SH |
197 | return -1; |
198 | } | |
3e625e2d SH |
199 | |
200 | return fd; | |
201 | } | |
202 | ||
74a3920a | 203 | static void remove_partial(struct lxc_container *c, int fd) |
3e625e2d SH |
204 | { |
205 | // $lxcpath + '/' + $name + '/partial' + \0 | |
206 | int len = strlen(c->config_path) + strlen(c->name) + 10; | |
207 | char *path = alloca(len); | |
208 | int ret; | |
209 | ||
210 | close(fd); | |
211 | ret = snprintf(path, len, "%s/%s/partial", c->config_path, c->name); | |
212 | if (ret < 0 || ret >= len) { | |
213 | ERROR("Error writing partial pathname"); | |
214 | return; | |
215 | } | |
3e625e2d SH |
216 | if (unlink(path) < 0) |
217 | SYSERROR("Error unlink partial file %s", path); | |
3e625e2d SH |
218 | } |
219 | ||
72d0e1cb | 220 | /* LOCKING |
3bc449ed SH |
221 | * 1. container_mem_lock(c) protects the struct lxc_container from multiple threads. |
222 | * 2. container_disk_lock(c) protects the on-disk container data - in particular the | |
223 | * container configuration file. | |
224 | * The container_disk_lock also takes the container_mem_lock. | |
225 | * 3. thread_mutex protects process data (ex: fd table) from multiple threads. | |
72d0e1cb SG |
226 | * NOTHING mutexes two independent programs with their own struct |
227 | * lxc_container for the same c->name, between API calls. For instance, | |
228 | * c->config_read(); c->start(); Between those calls, data on disk | |
229 | * could change (which shouldn't bother the caller unless for instance | |
230 | * the rootfs get moved). c->config_read(); update; c->config_write(); | |
231 | * Two such updaters could race. The callers should therefore check their | |
232 | * results. Trying to prevent that would necessarily expose us to deadlocks | |
233 | * due to hung callers. So I prefer to keep the locks only within our own | |
234 | * functions, not across functions. | |
235 | * | |
3bc449ed | 236 | * If you're going to clone while holding a lxccontainer, increment |
72d0e1cb SG |
237 | * c->numthreads (under privlock) before forking. When deleting, |
238 | * decrement numthreads under privlock, then if it hits 0 you can delete. | |
239 | * Do not ever use a lxccontainer whose numthreads you did not bump. | |
240 | */ | |
241 | ||
242 | static void lxc_container_free(struct lxc_container *c) | |
243 | { | |
244 | if (!c) | |
245 | return; | |
246 | ||
f10fad2f ME |
247 | free(c->configfile); |
248 | c->configfile = NULL; | |
249 | free(c->error_string); | |
250 | c->error_string = NULL; | |
d95db067 | 251 | if (c->slock) { |
df271a59 | 252 | lxc_putlock(c->slock); |
d95db067 DE |
253 | c->slock = NULL; |
254 | } | |
72d0e1cb | 255 | if (c->privlock) { |
df271a59 | 256 | lxc_putlock(c->privlock); |
72d0e1cb SG |
257 | c->privlock = NULL; |
258 | } | |
f10fad2f ME |
259 | free(c->name); |
260 | c->name = NULL; | |
d95db067 DE |
261 | if (c->lxc_conf) { |
262 | lxc_conf_free(c->lxc_conf); | |
263 | c->lxc_conf = NULL; | |
264 | } | |
f10fad2f ME |
265 | free(c->config_path); |
266 | c->config_path = NULL; | |
72cf75fa | 267 | |
72d0e1cb SG |
268 | free(c); |
269 | } | |
270 | ||
43d1aa34 SH |
271 | /* |
272 | * Consider the following case: | |
273 | freer | racing get()er | |
274 | ================================================================== | |
275 | lxc_container_put() | lxc_container_get() | |
276 | \ lxclock(c->privlock) | c->numthreads < 1? (no) | |
277 | \ c->numthreads = 0 | \ lxclock(c->privlock) -> waits | |
278 | \ lxcunlock() | \ | |
279 | \ lxc_container_free() | \ lxclock() returns | |
280 | | \ c->numthreads < 1 -> return 0 | |
281 | \ \ (free stuff) | | |
282 | \ \ sem_destroy(privlock) | | |
283 | ||
284 | * When the get()er checks numthreads the first time, one of the following | |
285 | * is true: | |
286 | * 1. freer has set numthreads = 0. get() returns 0 | |
287 | * 2. freer is between lxclock and setting numthreads to 0. get()er will | |
288 | * sem_wait on privlock, get lxclock after freer() drops it, then see | |
289 | * numthreads is 0 and exit without touching lxclock again.. | |
290 | * 3. freer has not yet locked privlock. If get()er runs first, then put()er | |
291 | * will see --numthreads = 1 and not call lxc_container_free(). | |
292 | */ | |
293 | ||
72d0e1cb SG |
294 | int lxc_container_get(struct lxc_container *c) |
295 | { | |
296 | if (!c) | |
297 | return 0; | |
298 | ||
43d1aa34 SH |
299 | // if someone else has already started freeing the container, don't |
300 | // try to take the lock, which may be invalid | |
301 | if (c->numthreads < 1) | |
302 | return 0; | |
303 | ||
5cee8c50 | 304 | if (container_mem_lock(c)) |
72d0e1cb SG |
305 | return 0; |
306 | if (c->numthreads < 1) { | |
307 | // bail without trying to unlock, bc the privlock is now probably | |
308 | // in freed memory | |
309 | return 0; | |
310 | } | |
311 | c->numthreads++; | |
5cee8c50 | 312 | container_mem_unlock(c); |
72d0e1cb SG |
313 | return 1; |
314 | } | |
315 | ||
316 | int lxc_container_put(struct lxc_container *c) | |
317 | { | |
318 | if (!c) | |
319 | return -1; | |
5cee8c50 | 320 | if (container_mem_lock(c)) |
72d0e1cb SG |
321 | return -1; |
322 | if (--c->numthreads < 1) { | |
5cee8c50 | 323 | container_mem_unlock(c); |
72d0e1cb SG |
324 | lxc_container_free(c); |
325 | return 1; | |
326 | } | |
5cee8c50 | 327 | container_mem_unlock(c); |
72d0e1cb SG |
328 | return 0; |
329 | } | |
330 | ||
858377e4 | 331 | static bool do_lxcapi_is_defined(struct lxc_container *c) |
72d0e1cb SG |
332 | { |
333 | struct stat statbuf; | |
334 | bool ret = false; | |
335 | int statret; | |
336 | ||
337 | if (!c) | |
338 | return false; | |
339 | ||
5cee8c50 | 340 | if (container_mem_lock(c)) |
72d0e1cb SG |
341 | return false; |
342 | if (!c->configfile) | |
343 | goto out; | |
344 | statret = stat(c->configfile, &statbuf); | |
345 | if (statret != 0) | |
346 | goto out; | |
347 | ret = true; | |
348 | ||
349 | out: | |
5cee8c50 | 350 | container_mem_unlock(c); |
72d0e1cb SG |
351 | return ret; |
352 | } | |
353 | ||
858377e4 SH |
354 | #define WRAP_API(rettype, fnname) \ |
355 | static rettype fnname(struct lxc_container *c) \ | |
356 | { \ | |
357 | rettype ret; \ | |
8164f0e2 TA |
358 | bool reset_config = false; \ |
359 | \ | |
360 | if (!current_config && c && c->lxc_conf) { \ | |
361 | current_config = c->lxc_conf; \ | |
362 | reset_config = true; \ | |
363 | } \ | |
364 | \ | |
858377e4 | 365 | ret = do_##fnname(c); \ |
8164f0e2 TA |
366 | if (reset_config) \ |
367 | current_config = NULL; \ | |
368 | \ | |
858377e4 SH |
369 | return ret; \ |
370 | } | |
371 | ||
372 | #define WRAP_API_1(rettype, fnname, t1) \ | |
373 | static rettype fnname(struct lxc_container *c, t1 a1) \ | |
374 | { \ | |
375 | rettype ret; \ | |
8164f0e2 TA |
376 | bool reset_config = false; \ |
377 | \ | |
378 | if (!current_config && c && c->lxc_conf) { \ | |
379 | current_config = c->lxc_conf; \ | |
380 | reset_config = true; \ | |
381 | } \ | |
382 | \ | |
858377e4 | 383 | ret = do_##fnname(c, a1); \ |
8164f0e2 TA |
384 | if (reset_config) \ |
385 | current_config = NULL; \ | |
386 | \ | |
858377e4 SH |
387 | return ret; \ |
388 | } | |
389 | ||
390 | #define WRAP_API_2(rettype, fnname, t1, t2) \ | |
391 | static rettype fnname(struct lxc_container *c, t1 a1, t2 a2) \ | |
392 | { \ | |
393 | rettype ret; \ | |
8164f0e2 TA |
394 | bool reset_config = false; \ |
395 | \ | |
396 | if (!current_config && c && c->lxc_conf) { \ | |
397 | current_config = c->lxc_conf; \ | |
398 | reset_config = true; \ | |
399 | } \ | |
400 | \ | |
858377e4 | 401 | ret = do_##fnname(c, a1, a2); \ |
8164f0e2 TA |
402 | if (reset_config) \ |
403 | current_config = NULL; \ | |
404 | \ | |
858377e4 SH |
405 | return ret; \ |
406 | } | |
407 | ||
408 | #define WRAP_API_3(rettype, fnname, t1, t2, t3) \ | |
409 | static rettype fnname(struct lxc_container *c, t1 a1, t2 a2, t3 a3) \ | |
410 | { \ | |
411 | rettype ret; \ | |
8164f0e2 TA |
412 | bool reset_config = false; \ |
413 | \ | |
414 | if (!current_config && c && c->lxc_conf) { \ | |
415 | current_config = c->lxc_conf; \ | |
416 | reset_config = true; \ | |
417 | } \ | |
418 | \ | |
858377e4 | 419 | ret = do_##fnname(c, a1, a2, a3); \ |
8164f0e2 TA |
420 | if (reset_config) \ |
421 | current_config = NULL; \ | |
422 | \ | |
858377e4 SH |
423 | return ret; \ |
424 | } | |
425 | ||
426 | WRAP_API(bool, lxcapi_is_defined) | |
427 | ||
428 | static const char *do_lxcapi_state(struct lxc_container *c) | |
72d0e1cb | 429 | { |
72d0e1cb SG |
430 | lxc_state_t s; |
431 | ||
432 | if (!c) | |
433 | return NULL; | |
13f5be62 | 434 | s = lxc_getstate(c->name, c->config_path); |
39dc698c | 435 | return lxc_state2str(s); |
72d0e1cb SG |
436 | } |
437 | ||
858377e4 SH |
438 | WRAP_API(const char *, lxcapi_state) |
439 | ||
39dc698c | 440 | static bool is_stopped(struct lxc_container *c) |
794dd120 SH |
441 | { |
442 | lxc_state_t s; | |
13f5be62 | 443 | s = lxc_getstate(c->name, c->config_path); |
794dd120 SH |
444 | return (s == STOPPED); |
445 | } | |
446 | ||
858377e4 | 447 | static bool do_lxcapi_is_running(struct lxc_container *c) |
72d0e1cb SG |
448 | { |
449 | const char *s; | |
450 | ||
451 | if (!c) | |
452 | return false; | |
858377e4 | 453 | s = do_lxcapi_state(c); |
72d0e1cb SG |
454 | if (!s || strcmp(s, "STOPPED") == 0) |
455 | return false; | |
456 | return true; | |
457 | } | |
458 | ||
858377e4 SH |
459 | WRAP_API(bool, lxcapi_is_running) |
460 | ||
461 | static bool do_lxcapi_freeze(struct lxc_container *c) | |
72d0e1cb SG |
462 | { |
463 | int ret; | |
464 | if (!c) | |
465 | return false; | |
466 | ||
9123e471 | 467 | ret = lxc_freeze(c->name, c->config_path); |
72d0e1cb SG |
468 | if (ret) |
469 | return false; | |
470 | return true; | |
471 | } | |
472 | ||
858377e4 SH |
473 | WRAP_API(bool, lxcapi_freeze) |
474 | ||
475 | static bool do_lxcapi_unfreeze(struct lxc_container *c) | |
72d0e1cb SG |
476 | { |
477 | int ret; | |
478 | if (!c) | |
479 | return false; | |
480 | ||
9123e471 | 481 | ret = lxc_unfreeze(c->name, c->config_path); |
72d0e1cb SG |
482 | if (ret) |
483 | return false; | |
484 | return true; | |
485 | } | |
486 | ||
858377e4 SH |
487 | WRAP_API(bool, lxcapi_unfreeze) |
488 | ||
489 | static int do_lxcapi_console_getfd(struct lxc_container *c, int *ttynum, int *masterfd) | |
0115f8fd DE |
490 | { |
491 | int ttyfd; | |
492 | if (!c) | |
493 | return -1; | |
494 | ||
b5159817 | 495 | ttyfd = lxc_console_getfd(c, ttynum, masterfd); |
0115f8fd DE |
496 | return ttyfd; |
497 | } | |
498 | ||
858377e4 SH |
499 | WRAP_API_2(int, lxcapi_console_getfd, int *, int *) |
500 | ||
b5159817 DE |
501 | static int lxcapi_console(struct lxc_container *c, int ttynum, int stdinfd, |
502 | int stdoutfd, int stderrfd, int escape) | |
503 | { | |
858377e4 SH |
504 | int ret; |
505 | ||
506 | if (!c) | |
507 | return -1; | |
508 | ||
509 | current_config = c->lxc_conf; | |
510 | ret = lxc_console(c, ttynum, stdinfd, stdoutfd, stderrfd, escape); | |
511 | current_config = NULL; | |
512 | return ret; | |
b5159817 DE |
513 | } |
514 | ||
858377e4 | 515 | static pid_t do_lxcapi_init_pid(struct lxc_container *c) |
72d0e1cb | 516 | { |
72d0e1cb SG |
517 | if (!c) |
518 | return -1; | |
519 | ||
5cee8c50 | 520 | return lxc_cmd_get_init_pid(c->name, c->config_path); |
72d0e1cb SG |
521 | } |
522 | ||
858377e4 SH |
523 | WRAP_API(pid_t, lxcapi_init_pid) |
524 | ||
12a50cc6 | 525 | static bool load_config_locked(struct lxc_container *c, const char *fname) |
8eb5694b SH |
526 | { |
527 | if (!c->lxc_conf) | |
528 | c->lxc_conf = lxc_conf_init(); | |
6b0d5538 SH |
529 | if (!c->lxc_conf) |
530 | return false; | |
d08779d4 SH |
531 | if (lxc_config_read(fname, c->lxc_conf, false) != 0) |
532 | return false; | |
d08779d4 | 533 | return true; |
8eb5694b SH |
534 | } |
535 | ||
858377e4 | 536 | static bool do_lxcapi_load_config(struct lxc_container *c, const char *alt_file) |
72d0e1cb | 537 | { |
39dc698c SH |
538 | bool ret = false, need_disklock = false; |
539 | int lret; | |
12a50cc6 | 540 | const char *fname; |
72d0e1cb SG |
541 | if (!c) |
542 | return false; | |
543 | ||
544 | fname = c->configfile; | |
545 | if (alt_file) | |
546 | fname = alt_file; | |
547 | if (!fname) | |
548 | return false; | |
39dc698c SH |
549 | /* |
550 | * If we're reading something other than the container's config, | |
551 | * we only need to lock the in-memory container. If loading the | |
552 | * container's config file, take the disk lock. | |
553 | */ | |
554 | if (strcmp(fname, c->configfile) == 0) | |
555 | need_disklock = true; | |
556 | ||
557 | if (need_disklock) | |
558 | lret = container_disk_lock(c); | |
559 | else | |
560 | lret = container_mem_lock(c); | |
561 | if (lret) | |
72d0e1cb | 562 | return false; |
39dc698c | 563 | |
8eb5694b | 564 | ret = load_config_locked(c, fname); |
39dc698c SH |
565 | |
566 | if (need_disklock) | |
567 | container_disk_unlock(c); | |
568 | else | |
569 | container_mem_unlock(c); | |
72d0e1cb SG |
570 | return ret; |
571 | } | |
572 | ||
858377e4 SH |
573 | WRAP_API_1(bool, lxcapi_load_config, const char *) |
574 | ||
575 | static bool do_lxcapi_want_daemonize(struct lxc_container *c, bool state) | |
72d0e1cb | 576 | { |
497a2995 | 577 | if (!c || !c->lxc_conf) |
540f932a | 578 | return false; |
f02abefe | 579 | if (container_mem_lock(c)) { |
3bc449ed | 580 | ERROR("Error getting mem lock"); |
540f932a | 581 | return false; |
3bc449ed | 582 | } |
a2739df5 | 583 | c->daemonize = state; |
3bc449ed | 584 | container_mem_unlock(c); |
540f932a | 585 | return true; |
72d0e1cb SG |
586 | } |
587 | ||
858377e4 SH |
588 | WRAP_API_1(bool, lxcapi_want_daemonize, bool) |
589 | ||
590 | static bool do_lxcapi_want_close_all_fds(struct lxc_container *c, bool state) | |
130a1888 ÇO |
591 | { |
592 | if (!c || !c->lxc_conf) | |
49badbbe | 593 | return false; |
130a1888 ÇO |
594 | if (container_mem_lock(c)) { |
595 | ERROR("Error getting mem lock"); | |
49badbbe | 596 | return false; |
130a1888 | 597 | } |
540f932a | 598 | c->lxc_conf->close_all_fds = state; |
130a1888 | 599 | container_mem_unlock(c); |
49badbbe | 600 | return true; |
130a1888 ÇO |
601 | } |
602 | ||
858377e4 SH |
603 | WRAP_API_1(bool, lxcapi_want_close_all_fds, bool) |
604 | ||
605 | static bool do_lxcapi_wait(struct lxc_container *c, const char *state, int timeout) | |
7a44c8b4 SG |
606 | { |
607 | int ret; | |
608 | ||
609 | if (!c) | |
610 | return false; | |
611 | ||
67e571de | 612 | ret = lxc_wait(c->name, state, timeout, c->config_path); |
7a44c8b4 SG |
613 | return ret == 0; |
614 | } | |
615 | ||
858377e4 | 616 | WRAP_API_2(bool, lxcapi_wait, const char *, int) |
7a44c8b4 | 617 | |
2d834aa8 SH |
618 | static bool am_single_threaded(void) |
619 | { | |
74f96976 | 620 | struct dirent *direntp; |
2d834aa8 SH |
621 | DIR *dir; |
622 | int count=0; | |
623 | ||
2d834aa8 | 624 | dir = opendir("/proc/self/task"); |
2d834aa8 SH |
625 | if (!dir) { |
626 | INFO("failed to open /proc/self/task"); | |
627 | return false; | |
628 | } | |
629 | ||
74f96976 | 630 | while ((direntp = readdir(dir))) { |
2d834aa8 SH |
631 | if (!direntp) |
632 | break; | |
633 | ||
634 | if (!strcmp(direntp->d_name, ".")) | |
635 | continue; | |
636 | ||
637 | if (!strcmp(direntp->d_name, "..")) | |
638 | continue; | |
639 | if (++count > 1) | |
640 | break; | |
641 | } | |
2d834aa8 | 642 | closedir(dir); |
2d834aa8 SH |
643 | return count == 1; |
644 | } | |
645 | ||
fd51a89b SH |
646 | static void push_arg(char ***argp, char *arg, int *nargs) |
647 | { | |
648 | char **argv; | |
649 | char *copy; | |
650 | ||
651 | do { | |
652 | copy = strdup(arg); | |
653 | } while (!copy); | |
654 | do { | |
655 | argv = realloc(*argp, (*nargs + 2) * sizeof(char *)); | |
656 | } while (!argv); | |
657 | *argp = argv; | |
658 | argv[*nargs] = copy; | |
659 | (*nargs)++; | |
660 | argv[*nargs] = NULL; | |
661 | } | |
662 | ||
663 | static char **split_init_cmd(const char *incmd) | |
664 | { | |
665 | size_t len; | |
666 | int nargs = 0; | |
5590a671 | 667 | char *copy, *p, *saveptr = NULL; |
fd51a89b SH |
668 | char **argv; |
669 | ||
670 | if (!incmd) | |
671 | return NULL; | |
672 | ||
673 | len = strlen(incmd) + 1; | |
674 | copy = alloca(len); | |
675 | strncpy(copy, incmd, len); | |
676 | copy[len-1] = '\0'; | |
677 | ||
678 | do { | |
679 | argv = malloc(sizeof(char *)); | |
680 | } while (!argv); | |
681 | argv[0] = NULL; | |
682 | for (p = strtok_r(copy, " ", &saveptr); p != NULL; | |
683 | p = strtok_r(NULL, " ", &saveptr)) | |
684 | push_arg(&argv, p, &nargs); | |
685 | ||
686 | if (nargs == 0) { | |
687 | free(argv); | |
688 | return NULL; | |
689 | } | |
690 | return argv; | |
691 | } | |
692 | ||
693 | static void free_init_cmd(char **argv) | |
694 | { | |
695 | int i = 0; | |
696 | ||
697 | if (!argv) | |
698 | return; | |
699 | while (argv[i]) | |
700 | free(argv[i++]); | |
701 | free(argv); | |
702 | } | |
703 | ||
5e5576a4 CB |
704 | static int lxc_rcv_status(int state_socket) |
705 | { | |
706 | int ret; | |
ee8377bd | 707 | int state = -1; |
5e5576a4 | 708 | |
ee8377bd | 709 | again: |
5e5576a4 CB |
710 | /* Receive container state. */ |
711 | ret = lxc_abstract_unix_rcv_credential(state_socket, &state, | |
ee8377bd CB |
712 | sizeof(int)); |
713 | if (ret <= 0) { | |
714 | if (errno != EINTR) | |
715 | return -1; | |
716 | TRACE("Caught EINTR; retrying"); | |
717 | goto again; | |
718 | } | |
5e5576a4 CB |
719 | |
720 | return state; | |
721 | } | |
722 | ||
723 | static bool wait_on_daemonized_start(struct lxc_handler *handler, int pid) | |
724 | { | |
725 | int state, status; | |
726 | ||
727 | /* Close write end of the socket pair. */ | |
728 | close(handler->state_socket_pair[1]); | |
729 | handler->state_socket_pair[1] = -1; | |
730 | ||
731 | state = lxc_rcv_status(handler->state_socket_pair[0]); | |
732 | ||
733 | /* Close read end of the socket pair. */ | |
734 | close(handler->state_socket_pair[0]); | |
735 | handler->state_socket_pair[0] = -1; | |
736 | ||
737 | /* The first child is going to fork() again and then exits. So we reap | |
738 | * the first child here. | |
739 | */ | |
740 | if (waitpid(pid, &status, 0) < 0) | |
741 | DEBUG("Failed waiting on first child"); | |
742 | else if (!WIFEXITED(status)) | |
743 | DEBUG("Failed to retrieve exit status of first child"); | |
744 | else if (WEXITSTATUS(status) != 0) | |
745 | DEBUG("First child exited with: %d", WEXITSTATUS(status)); | |
746 | ||
747 | if (state < 0) { | |
748 | SYSERROR("Failed to receive the container state"); | |
749 | return false; | |
750 | } | |
751 | ||
752 | /* If we receive anything else then running we know that the container | |
753 | * failed to start. | |
754 | */ | |
755 | if (state != RUNNING) { | |
756 | ERROR("Received container state \"%s\" instead of \"RUNNING\"", | |
757 | lxc_state2str(state)); | |
758 | return false; | |
759 | } | |
760 | ||
761 | TRACE("Container is in \"RUNNING\" state"); | |
762 | return true; | |
763 | } | |
764 | ||
858377e4 | 765 | static bool do_lxcapi_start(struct lxc_container *c, int useinit, char * const argv[]) |
72d0e1cb SG |
766 | { |
767 | int ret; | |
aa460476 | 768 | struct lxc_handler *handler; |
72d0e1cb | 769 | struct lxc_conf *conf; |
540f932a | 770 | bool daemonize = false; |
6eaac303 | 771 | FILE *pid_fp = NULL; |
72d0e1cb SG |
772 | char *default_args[] = { |
773 | "/sbin/init", | |
13aad0ae | 774 | NULL, |
72d0e1cb | 775 | }; |
fd51a89b | 776 | char **init_cmd = NULL; |
72d0e1cb | 777 | |
7cb19d44 | 778 | /* container does exist */ |
72d0e1cb SG |
779 | if (!c) |
780 | return false; | |
120146b9 | 781 | |
7cb19d44 CB |
782 | /* If anything fails before we set error_num, we want an error in there. |
783 | */ | |
120146b9 SG |
784 | c->error_num = 1; |
785 | ||
7cb19d44 | 786 | /* Container has not been setup. */ |
72d0e1cb SG |
787 | if (!c->lxc_conf) |
788 | return false; | |
789 | ||
c47eafec CB |
790 | ret = ongoing_create(c); |
791 | if (ret < 0) { | |
7cb19d44 | 792 | ERROR("Failed checking for incomplete container creation"); |
3e625e2d | 793 | return false; |
3e625e2d | 794 | } else if (ret == 1) { |
7cb19d44 | 795 | ERROR("Ongoing container creation detected"); |
3e625e2d | 796 | return false; |
c47eafec | 797 | } else if (ret == 2) { |
7cb19d44 | 798 | ERROR("Failed to create container"); |
c47eafec CB |
799 | do_lxcapi_destroy(c); |
800 | return false; | |
3e625e2d SH |
801 | } |
802 | ||
7cb19d44 | 803 | /* Is this app meant to be run through lxcinit, as in lxc-execute? */ |
72d0e1cb SG |
804 | if (useinit && !argv) |
805 | return false; | |
806 | ||
5cee8c50 | 807 | if (container_mem_lock(c)) |
72d0e1cb SG |
808 | return false; |
809 | conf = c->lxc_conf; | |
810 | daemonize = c->daemonize; | |
72d0e1cb | 811 | |
aa460476 | 812 | /* initialize handler */ |
5e5576a4 | 813 | handler = lxc_init_handler(c->name, conf, c->config_path, daemonize); |
dbc9832d | 814 | container_mem_unlock(c); |
aa460476 CB |
815 | if (!handler) |
816 | return false; | |
817 | ||
72d0e1cb | 818 | if (useinit) { |
aa460476 CB |
819 | TRACE("calling \"lxc_execute\""); |
820 | ret = lxc_execute(c->name, argv, 1, handler, c->config_path, | |
821 | daemonize); | |
822 | c->error_num = ret; | |
7cb19d44 CB |
823 | |
824 | if (ret != 0) | |
825 | return false; | |
826 | ||
827 | return true; | |
72d0e1cb SG |
828 | } |
829 | ||
7cb19d44 CB |
830 | /* If no argv was passed in, use lxc.init_cmd if provided in the |
831 | * configuration | |
832 | */ | |
fd51a89b SH |
833 | if (!argv) |
834 | argv = init_cmd = split_init_cmd(conf->init_cmd); | |
835 | ||
7cb19d44 | 836 | /* ... otherwise use default_args. */ |
fd51a89b SH |
837 | if (!argv) |
838 | argv = default_args; | |
72d0e1cb | 839 | |
7cb19d44 CB |
840 | /* I'm not sure what locks we want here.Any? Is liblxc's locking enough |
841 | * here to protect the on disk container? We don't want to exclude | |
842 | * things like lxc_info while the container is running. | |
843 | */ | |
72d0e1cb | 844 | if (daemonize) { |
a6b6ad7b | 845 | bool started; |
0a4be28d | 846 | char title[2048]; |
c47eafec | 847 | pid_t pid; |
71454076 | 848 | |
c47eafec | 849 | pid = fork(); |
f2e07cb6 | 850 | if (pid < 0) { |
c47eafec | 851 | free_init_cmd(init_cmd); |
f2e07cb6 | 852 | lxc_free_handler(handler); |
72d0e1cb | 853 | return false; |
f2e07cb6 | 854 | } |
6eaac303 | 855 | |
7cb19d44 | 856 | /* first parent */ |
6eaac303 QH |
857 | if (pid != 0) { |
858 | /* Set to NULL because we don't want father unlink | |
859 | * the PID file, child will do the free and unlink. | |
860 | */ | |
861 | c->pidfile = NULL; | |
5e5576a4 | 862 | |
7cb19d44 CB |
863 | /* Wait for container to tell us whether it started |
864 | * successfully. | |
865 | */ | |
a6b6ad7b CB |
866 | started = wait_on_daemonized_start(handler, pid); |
867 | ||
868 | free_init_cmd(init_cmd); | |
869 | lxc_free_handler(handler); | |
870 | return started; | |
6eaac303 | 871 | } |
025ed0f3 | 872 | |
7cb19d44 CB |
873 | /* first child */ |
874 | ||
0a4be28d | 875 | /* We don't really care if this doesn't print all the |
7cb19d44 CB |
876 | * characters. All that it means is that the proctitle will be |
877 | * ugly. Similarly, we also don't care if setproctitle() fails. | |
878 | * */ | |
0a4be28d TA |
879 | snprintf(title, sizeof(title), "[lxc monitor] %s %s", c->config_path, c->name); |
880 | INFO("Attempting to set proc title to %s", title); | |
881 | setproctitle(title); | |
882 | ||
7cb19d44 CB |
883 | /* We fork() a second time to be reparented to init. Like |
884 | * POSIX's daemon() function we change to "/" and redirect | |
885 | * std{in,out,err} to /dev/null. | |
886 | */ | |
697fa639 SH |
887 | pid = fork(); |
888 | if (pid < 0) { | |
7cb19d44 CB |
889 | SYSERROR("Failed to fork first child process"); |
890 | exit(EXIT_FAILURE); | |
697fa639 | 891 | } |
a6b6ad7b | 892 | |
7cb19d44 | 893 | /* second parent */ |
a6b6ad7b CB |
894 | if (pid != 0) { |
895 | free_init_cmd(init_cmd); | |
896 | lxc_free_handler(handler); | |
7cb19d44 | 897 | exit(EXIT_SUCCESS); |
a6b6ad7b CB |
898 | } |
899 | ||
7cb19d44 CB |
900 | /* second child */ |
901 | ||
902 | /* change to / directory */ | |
903 | ret = chdir("/"); | |
904 | if (ret < 0) { | |
905 | SYSERROR("Failed to change to \"/\" directory"); | |
906 | exit(EXIT_FAILURE); | |
c278cef2 | 907 | } |
7cb19d44 CB |
908 | |
909 | ret = lxc_check_inherited(conf, true, | |
910 | (int[]){handler->conf->maincmd_fd, | |
911 | handler->state_socket_pair[0], | |
912 | handler->state_socket_pair[1]}, | |
5e5576a4 | 913 | 3); |
7cb19d44 CB |
914 | if (ret < 0) |
915 | exit(EXIT_FAILURE); | |
916 | ||
917 | /* redirect std{in,out,err} to /dev/null */ | |
918 | ret = null_stdfds(); | |
919 | if (ret < 0) { | |
920 | ERROR("Failed to redirect std{in,out,err} to /dev/null"); | |
921 | exit(EXIT_FAILURE); | |
69aeabac | 922 | } |
7cb19d44 CB |
923 | |
924 | /* become session leader */ | |
925 | ret = setsid(); | |
926 | if (ret < 0) | |
927 | TRACE("Process %d is already process group leader", getpid()); | |
2d834aa8 SH |
928 | } else { |
929 | if (!am_single_threaded()) { | |
930 | ERROR("Cannot start non-daemonized container when threaded"); | |
a6b6ad7b | 931 | free_init_cmd(init_cmd); |
f2e07cb6 | 932 | lxc_free_handler(handler); |
2d834aa8 SH |
933 | return false; |
934 | } | |
72d0e1cb SG |
935 | } |
936 | ||
aa460476 | 937 | /* We need to write PID file after daemonize, so we always |
6eaac303 QH |
938 | * write the right PID. |
939 | */ | |
940 | if (c->pidfile) { | |
941 | pid_fp = fopen(c->pidfile, "w"); | |
942 | if (pid_fp == NULL) { | |
943 | SYSERROR("Failed to create pidfile '%s' for '%s'", | |
944 | c->pidfile, c->name); | |
c47eafec | 945 | free_init_cmd(init_cmd); |
f2e07cb6 | 946 | lxc_free_handler(handler); |
13353dc4 | 947 | if (daemonize) |
7cb19d44 | 948 | exit(EXIT_FAILURE); |
6eaac303 QH |
949 | return false; |
950 | } | |
951 | ||
952 | if (fprintf(pid_fp, "%d\n", getpid()) < 0) { | |
953 | SYSERROR("Failed to write '%s'", c->pidfile); | |
954 | fclose(pid_fp); | |
955 | pid_fp = NULL; | |
c47eafec | 956 | free_init_cmd(init_cmd); |
f2e07cb6 | 957 | lxc_free_handler(handler); |
13353dc4 | 958 | if (daemonize) |
7cb19d44 | 959 | exit(EXIT_FAILURE); |
6eaac303 QH |
960 | return false; |
961 | } | |
962 | ||
963 | fclose(pid_fp); | |
964 | pid_fp = NULL; | |
965 | } | |
966 | ||
72d0e1cb | 967 | conf->reboot = 0; |
d2cf4c37 | 968 | |
a8dfe4e0 WB |
969 | /* Unshare the mount namespace if requested */ |
970 | if (conf->monitor_unshare) { | |
7cb19d44 CB |
971 | ret = unshare(CLONE_NEWNS); |
972 | if (ret < 0) { | |
a8dfe4e0 | 973 | SYSERROR("failed to unshare mount namespace"); |
f2e07cb6 | 974 | lxc_free_handler(handler); |
a6b6ad7b | 975 | ret = 1; |
7cb19d44 | 976 | goto on_error; |
a8dfe4e0 | 977 | } |
7cb19d44 CB |
978 | |
979 | ret = mount(NULL, "/", NULL, MS_SLAVE|MS_REC, NULL); | |
980 | if (ret < 0) { | |
a8dfe4e0 | 981 | SYSERROR("Failed to make / rslave at startup"); |
f2e07cb6 | 982 | lxc_free_handler(handler); |
a6b6ad7b | 983 | ret = 1; |
7cb19d44 | 984 | goto on_error; |
a8dfe4e0 WB |
985 | } |
986 | } | |
987 | ||
8bee8851 | 988 | reboot: |
aa460476 CB |
989 | if (conf->reboot == 2) { |
990 | /* initialize handler */ | |
5e5576a4 | 991 | handler = lxc_init_handler(c->name, conf, c->config_path, daemonize); |
a6b6ad7b CB |
992 | if (!handler) { |
993 | ret = 1; | |
7cb19d44 | 994 | goto on_error; |
a6b6ad7b | 995 | } |
aa460476 CB |
996 | } |
997 | ||
7cb19d44 CB |
998 | ret = lxc_check_inherited(conf, daemonize, |
999 | (int[]){handler->conf->maincmd_fd, | |
1000 | handler->state_socket_pair[0], | |
1001 | handler->state_socket_pair[1]}, | |
1002 | 3); | |
1003 | if (ret < 0) { | |
f2e07cb6 | 1004 | lxc_free_handler(handler); |
d2cf4c37 | 1005 | ret = 1; |
7cb19d44 | 1006 | goto on_error; |
d2cf4c37 SH |
1007 | } |
1008 | ||
aa460476 | 1009 | ret = lxc_start(c->name, argv, handler, c->config_path, daemonize); |
d4ef230c | 1010 | c->error_num = ret; |
72d0e1cb | 1011 | |
8bee8851 | 1012 | if (conf->reboot == 1) { |
7cb19d44 | 1013 | INFO("Container requested reboot"); |
8bee8851 | 1014 | conf->reboot = 2; |
72d0e1cb SG |
1015 | goto reboot; |
1016 | } | |
1017 | ||
7cb19d44 | 1018 | on_error: |
487d8008 QH |
1019 | if (c->pidfile) { |
1020 | unlink(c->pidfile); | |
1021 | free(c->pidfile); | |
1022 | c->pidfile = NULL; | |
1023 | } | |
fd51a89b SH |
1024 | free_init_cmd(init_cmd); |
1025 | ||
7cb19d44 CB |
1026 | if (daemonize && ret != 0) |
1027 | exit(EXIT_FAILURE); | |
1028 | else if (daemonize) | |
1029 | exit(EXIT_SUCCESS); | |
1030 | ||
1031 | if (ret != 0) | |
1032 | return false; | |
1033 | ||
1034 | return true; | |
72d0e1cb SG |
1035 | } |
1036 | ||
858377e4 SH |
1037 | static bool lxcapi_start(struct lxc_container *c, int useinit, char * const argv[]) |
1038 | { | |
1039 | bool ret; | |
1040 | current_config = c ? c->lxc_conf : NULL; | |
1041 | ret = do_lxcapi_start(c, useinit, argv); | |
1042 | current_config = NULL; | |
1043 | return ret; | |
1044 | } | |
1045 | ||
72d0e1cb SG |
1046 | /* |
1047 | * note there MUST be an ending NULL | |
1048 | */ | |
1049 | static bool lxcapi_startl(struct lxc_container *c, int useinit, ...) | |
1050 | { | |
1051 | va_list ap; | |
a0e93eeb | 1052 | char **inargs = NULL; |
72d0e1cb SG |
1053 | bool bret = false; |
1054 | ||
1055 | /* container exists */ | |
1056 | if (!c) | |
1057 | return false; | |
1058 | ||
858377e4 SH |
1059 | current_config = c->lxc_conf; |
1060 | ||
72d0e1cb | 1061 | va_start(ap, useinit); |
a0e93eeb | 1062 | inargs = lxc_va_arg_list_to_argv(ap, 0, 1); |
72d0e1cb SG |
1063 | va_end(ap); |
1064 | ||
a0e93eeb CS |
1065 | if (!inargs) { |
1066 | ERROR("Memory allocation error."); | |
1067 | goto out; | |
72d0e1cb SG |
1068 | } |
1069 | ||
a0e93eeb | 1070 | /* pass NULL if no arguments were supplied */ |
858377e4 | 1071 | bret = do_lxcapi_start(c, useinit, *inargs ? inargs : NULL); |
72d0e1cb SG |
1072 | |
1073 | out: | |
1074 | if (inargs) { | |
4e03ae57 DE |
1075 | char **arg; |
1076 | for (arg = inargs; *arg; arg++) | |
1077 | free(*arg); | |
72d0e1cb SG |
1078 | free(inargs); |
1079 | } | |
1080 | ||
858377e4 | 1081 | current_config = NULL; |
72d0e1cb SG |
1082 | return bret; |
1083 | } | |
1084 | ||
858377e4 | 1085 | static bool do_lxcapi_stop(struct lxc_container *c) |
72d0e1cb SG |
1086 | { |
1087 | int ret; | |
1088 | ||
1089 | if (!c) | |
1090 | return false; | |
1091 | ||
ef6e34ee | 1092 | ret = lxc_cmd_stop(c->name, c->config_path); |
72d0e1cb | 1093 | |
d775f21b | 1094 | return ret == 0; |
72d0e1cb SG |
1095 | } |
1096 | ||
858377e4 SH |
1097 | WRAP_API(bool, lxcapi_stop) |
1098 | ||
d5752559 SH |
1099 | static int do_create_container_dir(const char *path, struct lxc_conf *conf) |
1100 | { | |
1101 | int ret = -1, lasterr; | |
1102 | char *p = alloca(strlen(path)+1); | |
1103 | mode_t mask = umask(0002); | |
1104 | ret = mkdir(path, 0770); | |
1105 | lasterr = errno; | |
1106 | umask(mask); | |
1107 | errno = lasterr; | |
1108 | if (ret) { | |
1109 | if (errno == EEXIST) | |
1110 | ret = 0; | |
1111 | else { | |
1112 | SYSERROR("failed to create container path %s", path); | |
1113 | return -1; | |
1114 | } | |
1115 | } | |
1116 | strcpy(p, path); | |
1117 | if (!lxc_list_empty(&conf->id_map) && chown_mapped_root(p, conf) != 0) { | |
1118 | ERROR("Failed to chown container dir"); | |
1119 | ret = -1; | |
1120 | } | |
1121 | return ret; | |
1122 | } | |
1123 | ||
72d0e1cb SG |
1124 | /* |
1125 | * create the standard expected container dir | |
1126 | */ | |
1127 | static bool create_container_dir(struct lxc_container *c) | |
1128 | { | |
1129 | char *s; | |
1130 | int len, ret; | |
1131 | ||
2a59a681 | 1132 | len = strlen(c->config_path) + strlen(c->name) + 2; |
72d0e1cb SG |
1133 | s = malloc(len); |
1134 | if (!s) | |
1135 | return false; | |
2a59a681 | 1136 | ret = snprintf(s, len, "%s/%s", c->config_path, c->name); |
72d0e1cb SG |
1137 | if (ret < 0 || ret >= len) { |
1138 | free(s); | |
1139 | return false; | |
1140 | } | |
d5752559 | 1141 | ret = do_create_container_dir(s, c->lxc_conf); |
72d0e1cb SG |
1142 | free(s); |
1143 | return ret == 0; | |
1144 | } | |
1145 | ||
10bc1861 CB |
1146 | /* do_storage_create: thin wrapper around storage_create(). Like |
1147 | * storage_create(), it returns a mounted bdev on success, NULL on error. | |
72d0e1cb | 1148 | */ |
10bc1861 CB |
1149 | static struct lxc_storage *do_storage_create(struct lxc_container *c, |
1150 | const char *type, | |
1151 | struct bdev_specs *specs) | |
1897e3bc SH |
1152 | { |
1153 | char *dest; | |
1897e3bc | 1154 | size_t len; |
10bc1861 | 1155 | struct lxc_storage *bdev; |
1897e3bc SH |
1156 | int ret; |
1157 | ||
cd219ae6 | 1158 | /* rootfs.path or lxcpath/lxcname/rootfs */ |
f7ac4459 | 1159 | if (c->lxc_conf->rootfs.path && !access(c->lxc_conf->rootfs.path, F_OK)) { |
cf465fe4 SH |
1160 | const char *rpath = c->lxc_conf->rootfs.path; |
1161 | len = strlen(rpath) + 1; | |
cd219ae6 | 1162 | dest = alloca(len); |
cf465fe4 | 1163 | ret = snprintf(dest, len, "%s", rpath); |
cd219ae6 | 1164 | } else { |
858377e4 | 1165 | const char *lxcpath = do_lxcapi_get_config_path(c); |
cd219ae6 SY |
1166 | len = strlen(c->name) + strlen(lxcpath) + 9; |
1167 | dest = alloca(len); | |
1168 | ret = snprintf(dest, len, "%s/%s/rootfs", lxcpath, c->name); | |
1169 | } | |
1897e3bc SH |
1170 | if (ret < 0 || ret >= len) |
1171 | return NULL; | |
1172 | ||
10bc1861 | 1173 | bdev = storage_create(dest, type, c->name, specs); |
d44e88c2 | 1174 | if (!bdev) { |
959aee9c | 1175 | ERROR("Failed to create backing store type %s", type); |
1897e3bc | 1176 | return NULL; |
d44e88c2 SH |
1177 | } |
1178 | ||
7a96a068 CB |
1179 | if (!c->set_config_item(c, "lxc.rootfs.path", bdev->src)) { |
1180 | ERROR("Failed to set config item \"lxc.rootfs.path\" to \"%s\"", | |
f7ac4459 CB |
1181 | bdev->src); |
1182 | return NULL; | |
1183 | } | |
cf3ef16d | 1184 | |
f7ac4459 CB |
1185 | /* If we are not root, chown the rootfs dir to root in the |
1186 | * target uidmap. | |
1187 | */ | |
0e6e3a41 | 1188 | if (geteuid() != 0 || (c->lxc_conf && !lxc_list_empty(&c->lxc_conf->id_map))) { |
c4d10a05 | 1189 | if (chown_mapped_root(bdev->dest, c->lxc_conf) < 0) { |
959aee9c | 1190 | ERROR("Error chowning %s to container root", bdev->dest); |
97e9cfa0 | 1191 | suggest_default_idmap(); |
10bc1861 | 1192 | storage_put(bdev); |
cf3ef16d SH |
1193 | return NULL; |
1194 | } | |
1195 | } | |
1196 | ||
1897e3bc SH |
1197 | return bdev; |
1198 | } | |
1199 | ||
96b3cb40 | 1200 | static char *lxcbasename(char *path) |
72d0e1cb | 1201 | { |
96b3cb40 SH |
1202 | char *p = path + strlen(path) - 1; |
1203 | while (*p != '/' && p > path) | |
1204 | p--; | |
1205 | return p; | |
1206 | } | |
72d0e1cb | 1207 | |
69aeabac | 1208 | static bool create_run_template(struct lxc_container *c, char *tpath, bool need_null_stdfds, |
96b3cb40 SH |
1209 | char *const argv[]) |
1210 | { | |
1211 | pid_t pid; | |
72d0e1cb | 1212 | |
72d0e1cb | 1213 | if (!tpath) |
96b3cb40 | 1214 | return true; |
72d0e1cb SG |
1215 | |
1216 | pid = fork(); | |
1217 | if (pid < 0) { | |
959aee9c | 1218 | SYSERROR("failed to fork task for container creation template"); |
96b3cb40 | 1219 | return false; |
72d0e1cb SG |
1220 | } |
1221 | ||
1222 | if (pid == 0) { // child | |
39460be8 | 1223 | char *patharg, *namearg, *rootfsarg; |
10bc1861 | 1224 | struct lxc_storage *bdev = NULL; |
72d0e1cb | 1225 | int i; |
96b3cb40 SH |
1226 | int ret, len, nargs = 0; |
1227 | char **newargv; | |
cf3ef16d | 1228 | struct lxc_conf *conf = c->lxc_conf; |
72d0e1cb | 1229 | |
69aeabac TA |
1230 | if (need_null_stdfds && null_stdfds() < 0) { |
1231 | exit(1); | |
dc23c1c8 | 1232 | } |
1897e3bc | 1233 | |
10bc1861 | 1234 | bdev = storage_init(c->lxc_conf, c->lxc_conf->rootfs.path, c->lxc_conf->rootfs.mount, NULL); |
1897e3bc SH |
1235 | if (!bdev) { |
1236 | ERROR("Error opening rootfs"); | |
1237 | exit(1); | |
1238 | } | |
1239 | ||
4de2791f | 1240 | if (geteuid() == 0) { |
cf3ef16d SH |
1241 | if (unshare(CLONE_NEWNS) < 0) { |
1242 | ERROR("error unsharing mounts"); | |
1243 | exit(1); | |
1244 | } | |
4de2791f | 1245 | if (detect_shared_rootfs()) { |
c597baa8 | 1246 | if (mount(NULL, "/", NULL, MS_SLAVE|MS_REC, NULL)) { |
4de2791f SH |
1247 | SYSERROR("Failed to make / rslave to run template"); |
1248 | ERROR("Continuing..."); | |
1249 | } | |
1250 | } | |
1251 | } | |
2659c7cb | 1252 | if (strcmp(bdev->type, "dir") && strcmp(bdev->type, "btrfs")) { |
4de2791f | 1253 | if (geteuid() != 0) { |
2659c7cb | 1254 | ERROR("non-root users can only create btrfs and directory-backed containers"); |
241978fa | 1255 | exit(EXIT_FAILURE); |
4de2791f | 1256 | } |
241978fa CB |
1257 | |
1258 | if (!strcmp(bdev->type, "overlay") || !strcmp(bdev->type, "overlayfs")) { | |
1259 | /* If we create an overlay container we need to | |
1260 | * rsync the contents into | |
1261 | * <container-path>/<container-name>/rootfs. | |
1262 | * However, the overlay mount function will | |
1263 | * mount will mount | |
1264 | * <container-path>/<container-name>/delta0 | |
1265 | * over | |
1266 | * <container-path>/<container-name>/rootfs | |
1267 | * which means we would rsync the rootfs into | |
1268 | * the delta directory. That doesn't make sense | |
1269 | * since the delta directory only exists to | |
1270 | * record the differences to | |
1271 | * <container-path>/<container-name>/rootfs. So | |
1272 | * let's simply bind-mount here and then rsync | |
1273 | * directly into | |
1274 | * <container-path>/<container-name>/rootfs. | |
1275 | */ | |
1276 | char *src; | |
1277 | ||
1278 | src = ovl_get_rootfs(bdev->src, &(size_t){0}); | |
1279 | if (!src) { | |
1280 | ERROR("Failed to get rootfs"); | |
1281 | exit(EXIT_FAILURE); | |
1282 | } | |
1283 | ||
1284 | ret = mount(src, bdev->dest, "bind", MS_BIND | MS_REC, NULL); | |
1285 | if (ret < 0) { | |
1286 | ERROR("Failed to mount rootfs"); | |
1287 | return -1; | |
1288 | } | |
1289 | } else { | |
1290 | if (bdev->ops->mount(bdev) < 0) { | |
1291 | ERROR("Failed to mount rootfs"); | |
1292 | exit(EXIT_FAILURE); | |
1293 | } | |
cf3ef16d SH |
1294 | } |
1295 | } else { // TODO come up with a better way here! | |
e9705550 | 1296 | char *src; |
f10fad2f | 1297 | free(bdev->dest); |
e9705550 CB |
1298 | src = lxc_storage_get_path(bdev->src, bdev->type); |
1299 | bdev->dest = strdup(src); | |
1897e3bc SH |
1300 | } |
1301 | ||
72d0e1cb SG |
1302 | /* |
1303 | * create our new array, pre-pend the template name and | |
1304 | * base args | |
1305 | */ | |
1306 | if (argv) | |
1897e3bc | 1307 | for (nargs = 0; argv[nargs]; nargs++) ; |
6849cb5b | 1308 | nargs += 4; // template, path, rootfs and name args |
cf3ef16d | 1309 | |
72d0e1cb SG |
1310 | newargv = malloc(nargs * sizeof(*newargv)); |
1311 | if (!newargv) | |
1312 | exit(1); | |
96b3cb40 | 1313 | newargv[0] = lxcbasename(tpath); |
72d0e1cb | 1314 | |
2a59a681 | 1315 | len = strlen(c->config_path) + strlen(c->name) + strlen("--path=") + 2; |
72d0e1cb SG |
1316 | patharg = malloc(len); |
1317 | if (!patharg) | |
1318 | exit(1); | |
2a59a681 | 1319 | ret = snprintf(patharg, len, "--path=%s/%s", c->config_path, c->name); |
72d0e1cb SG |
1320 | if (ret < 0 || ret >= len) |
1321 | exit(1); | |
1322 | newargv[1] = patharg; | |
1323 | len = strlen("--name=") + strlen(c->name) + 1; | |
1324 | namearg = malloc(len); | |
1325 | if (!namearg) | |
1326 | exit(1); | |
1327 | ret = snprintf(namearg, len, "--name=%s", c->name); | |
1328 | if (ret < 0 || ret >= len) | |
1329 | exit(1); | |
1330 | newargv[2] = namearg; | |
1331 | ||
1897e3bc SH |
1332 | len = strlen("--rootfs=") + 1 + strlen(bdev->dest); |
1333 | rootfsarg = malloc(len); | |
1334 | if (!rootfsarg) | |
1335 | exit(1); | |
1336 | ret = snprintf(rootfsarg, len, "--rootfs=%s", bdev->dest); | |
1337 | if (ret < 0 || ret >= len) | |
1338 | exit(1); | |
1339 | newargv[3] = rootfsarg; | |
1340 | ||
72d0e1cb SG |
1341 | /* add passed-in args */ |
1342 | if (argv) | |
1897e3bc SH |
1343 | for (i = 4; i < nargs; i++) |
1344 | newargv[i] = argv[i-4]; | |
72d0e1cb SG |
1345 | |
1346 | /* add trailing NULL */ | |
1347 | nargs++; | |
1348 | newargv = realloc(newargv, nargs * sizeof(*newargv)); | |
1349 | if (!newargv) | |
1350 | exit(1); | |
1351 | newargv[nargs - 1] = NULL; | |
1352 | ||
cf3ef16d SH |
1353 | /* |
1354 | * If we're running the template in a mapped userns, then | |
1355 | * we prepend the template command with: | |
1356 | * lxc-usernsexec <-m map1> ... <-m mapn> -- | |
57d116ab SH |
1357 | * and we append "--mapped-uid x", where x is the mapped uid |
1358 | * for our geteuid() | |
cf3ef16d | 1359 | */ |
0e6e3a41 | 1360 | if (!lxc_list_empty(&conf->id_map)) { |
cf3ef16d | 1361 | int n2args = 1; |
57d116ab | 1362 | char txtuid[20]; |
2133f58c | 1363 | char txtgid[20]; |
cf3ef16d SH |
1364 | char **n2 = malloc(n2args * sizeof(*n2)); |
1365 | struct lxc_list *it; | |
1366 | struct id_map *map; | |
1367 | ||
57d116ab SH |
1368 | if (!n2) { |
1369 | SYSERROR("out of memory"); | |
1370 | exit(1); | |
1371 | } | |
cf3ef16d SH |
1372 | newargv[0] = tpath; |
1373 | tpath = "lxc-usernsexec"; | |
1374 | n2[0] = "lxc-usernsexec"; | |
1375 | lxc_list_for_each(it, &conf->id_map) { | |
1376 | map = it->elem; | |
1377 | n2args += 2; | |
57d116ab | 1378 | n2 = realloc(n2, n2args * sizeof(char *)); |
cf3ef16d SH |
1379 | if (!n2) |
1380 | exit(1); | |
1381 | n2[n2args-2] = "-m"; | |
1382 | n2[n2args-1] = malloc(200); | |
1383 | if (!n2[n2args-1]) | |
1384 | exit(1); | |
1385 | ret = snprintf(n2[n2args-1], 200, "%c:%lu:%lu:%lu", | |
1386 | map->idtype == ID_TYPE_UID ? 'u' : 'g', | |
1387 | map->nsid, map->hostid, map->range); | |
1388 | if (ret < 0 || ret >= 200) | |
1389 | exit(1); | |
1390 | } | |
2133f58c | 1391 | int hostid_mapped = mapped_hostid(geteuid(), conf, ID_TYPE_UID); |
6849cb5b | 1392 | int extraargs = hostid_mapped >= 0 ? 1 : 3; |
57d116ab | 1393 | n2 = realloc(n2, (nargs + n2args + extraargs) * sizeof(char *)); |
cf3ef16d SH |
1394 | if (!n2) |
1395 | exit(1); | |
57d116ab | 1396 | if (hostid_mapped < 0) { |
339efad9 | 1397 | hostid_mapped = find_unmapped_nsid(conf, ID_TYPE_UID); |
cf3ef16d | 1398 | n2[n2args++] = "-m"; |
57d116ab | 1399 | if (hostid_mapped < 0) { |
cf3ef16d SH |
1400 | ERROR("Could not find free uid to map"); |
1401 | exit(1); | |
1402 | } | |
1403 | n2[n2args++] = malloc(200); | |
1404 | if (!n2[n2args-1]) { | |
1405 | SYSERROR("out of memory"); | |
1406 | exit(1); | |
1407 | } | |
1408 | ret = snprintf(n2[n2args-1], 200, "u:%d:%d:1", | |
57d116ab | 1409 | hostid_mapped, geteuid()); |
cf3ef16d SH |
1410 | if (ret < 0 || ret >= 200) { |
1411 | ERROR("string too long"); | |
1412 | exit(1); | |
1413 | } | |
1414 | } | |
2133f58c SH |
1415 | int hostgid_mapped = mapped_hostid(getegid(), conf, ID_TYPE_GID); |
1416 | extraargs = hostgid_mapped >= 0 ? 1 : 3; | |
1417 | n2 = realloc(n2, (nargs + n2args + extraargs) * sizeof(char *)); | |
1418 | if (!n2) | |
1419 | exit(1); | |
1420 | if (hostgid_mapped < 0) { | |
339efad9 | 1421 | hostgid_mapped = find_unmapped_nsid(conf, ID_TYPE_GID); |
2133f58c SH |
1422 | n2[n2args++] = "-m"; |
1423 | if (hostgid_mapped < 0) { | |
1424 | ERROR("Could not find free uid to map"); | |
1425 | exit(1); | |
1426 | } | |
1427 | n2[n2args++] = malloc(200); | |
1428 | if (!n2[n2args-1]) { | |
1429 | SYSERROR("out of memory"); | |
1430 | exit(1); | |
1431 | } | |
1432 | ret = snprintf(n2[n2args-1], 200, "g:%d:%d:1", | |
1433 | hostgid_mapped, getegid()); | |
1434 | if (ret < 0 || ret >= 200) { | |
1435 | ERROR("string too long"); | |
1436 | exit(1); | |
1437 | } | |
1438 | } | |
cf3ef16d SH |
1439 | n2[n2args++] = "--"; |
1440 | for (i = 0; i < nargs; i++) | |
1441 | n2[i + n2args] = newargv[i]; | |
57d116ab SH |
1442 | n2args += nargs; |
1443 | // Finally add "--mapped-uid $uid" to tell template what to chown | |
1444 | // cached images to | |
2133f58c | 1445 | n2args += 4; |
57d116ab SH |
1446 | n2 = realloc(n2, n2args * sizeof(char *)); |
1447 | if (!n2) { | |
1448 | SYSERROR("out of memory"); | |
1449 | exit(1); | |
1450 | } | |
1451 | // note n2[n2args-1] is NULL | |
2133f58c | 1452 | n2[n2args-5] = "--mapped-uid"; |
57d116ab | 1453 | snprintf(txtuid, 20, "%d", hostid_mapped); |
2133f58c SH |
1454 | n2[n2args-4] = txtuid; |
1455 | n2[n2args-3] = "--mapped-gid"; | |
1456 | snprintf(txtgid, 20, "%d", hostgid_mapped); | |
1457 | n2[n2args-2] = txtgid; | |
57d116ab | 1458 | n2[n2args-1] = NULL; |
cf3ef16d SH |
1459 | free(newargv); |
1460 | newargv = n2; | |
1461 | } | |
72d0e1cb | 1462 | /* execute */ |
cf3ef16d | 1463 | execvp(tpath, newargv); |
e9705550 | 1464 | SYSERROR("Failed to execute template %s", tpath); |
72d0e1cb SG |
1465 | exit(1); |
1466 | } | |
1467 | ||
9be53773 | 1468 | if (wait_for_pid(pid) != 0) { |
959aee9c | 1469 | ERROR("container creation template for %s failed", c->name); |
96b3cb40 SH |
1470 | return false; |
1471 | } | |
1472 | ||
1473 | return true; | |
1474 | } | |
1475 | ||
74a3920a | 1476 | static bool prepend_lxc_header(char *path, const char *t, char *const argv[]) |
3ce74686 | 1477 | { |
1fd9bd50 | 1478 | long flen; |
b4569e93 | 1479 | char *contents; |
3ce74686 | 1480 | FILE *f; |
025ed0f3 | 1481 | int ret = -1; |
52026772 | 1482 | #if HAVE_LIBGNUTLS |
025ed0f3 | 1483 | int i; |
3ce74686 | 1484 | unsigned char md_value[SHA_DIGEST_LENGTH]; |
b4569e93 | 1485 | char *tpath; |
52026772 | 1486 | #endif |
3ce74686 | 1487 | |
025ed0f3 | 1488 | f = fopen(path, "r"); |
025ed0f3 | 1489 | if (f == NULL) |
3ce74686 | 1490 | return false; |
025ed0f3 SH |
1491 | |
1492 | if (fseek(f, 0, SEEK_END) < 0) | |
1493 | goto out_error; | |
1494 | if ((flen = ftell(f)) < 0) | |
1495 | goto out_error; | |
1496 | if (fseek(f, 0, SEEK_SET) < 0) | |
1497 | goto out_error; | |
1498 | if ((contents = malloc(flen + 1)) == NULL) | |
1499 | goto out_error; | |
1500 | if (fread(contents, 1, flen, f) != flen) | |
1501 | goto out_free_contents; | |
1502 | ||
3ce74686 | 1503 | contents[flen] = '\0'; |
025ed0f3 | 1504 | ret = fclose(f); |
025ed0f3 SH |
1505 | f = NULL; |
1506 | if (ret < 0) | |
1507 | goto out_free_contents; | |
3ce74686 | 1508 | |
b4569e93 | 1509 | #if HAVE_LIBGNUTLS |
01efd4d3 | 1510 | tpath = get_template_path(t); |
85db5535 | 1511 | if (!tpath) { |
959aee9c | 1512 | ERROR("bad template: %s", t); |
025ed0f3 | 1513 | goto out_free_contents; |
3ce74686 SH |
1514 | } |
1515 | ||
85db5535 DE |
1516 | ret = sha1sum_file(tpath, md_value); |
1517 | if (ret < 0) { | |
1518 | ERROR("Error getting sha1sum of %s", tpath); | |
3ce74686 | 1519 | free(tpath); |
85db5535 | 1520 | goto out_free_contents; |
3ce74686 | 1521 | } |
85db5535 | 1522 | free(tpath); |
3ce74686 SH |
1523 | #endif |
1524 | ||
025ed0f3 | 1525 | f = fopen(path, "w"); |
025ed0f3 | 1526 | if (f == NULL) { |
3ce74686 SH |
1527 | SYSERROR("reopening config for writing"); |
1528 | free(contents); | |
1529 | return false; | |
1530 | } | |
1531 | fprintf(f, "# Template used to create this container: %s\n", t); | |
1532 | if (argv) { | |
1533 | fprintf(f, "# Parameters passed to the template:"); | |
1534 | while (*argv) { | |
1535 | fprintf(f, " %s", *argv); | |
1536 | argv++; | |
1537 | } | |
1538 | fprintf(f, "\n"); | |
1539 | } | |
1540 | #if HAVE_LIBGNUTLS | |
56698177 SH |
1541 | fprintf(f, "# Template script checksum (SHA-1): "); |
1542 | for (i=0; i<SHA_DIGEST_LENGTH; i++) | |
1543 | fprintf(f, "%02x", md_value[i]); | |
1544 | fprintf(f, "\n"); | |
3ce74686 | 1545 | #endif |
0520c252 | 1546 | fprintf(f, "# For additional config options, please look at lxc.container.conf(5)\n"); |
49a2ed80 SH |
1547 | fprintf(f, "\n# Uncomment the following line to support nesting containers:\n"); |
1548 | fprintf(f, "#lxc.include = " LXCTEMPLATECONFIG "/nesting.conf\n"); | |
1549 | fprintf(f, "# (Be aware this has security implications)\n\n"); | |
3ce74686 SH |
1550 | if (fwrite(contents, 1, flen, f) != flen) { |
1551 | SYSERROR("Writing original contents"); | |
1552 | free(contents); | |
1553 | fclose(f); | |
1554 | return false; | |
1555 | } | |
025ed0f3 SH |
1556 | ret = 0; |
1557 | out_free_contents: | |
3ce74686 | 1558 | free(contents); |
025ed0f3 SH |
1559 | out_error: |
1560 | if (f) { | |
1561 | int newret; | |
025ed0f3 | 1562 | newret = fclose(f); |
025ed0f3 SH |
1563 | if (ret == 0) |
1564 | ret = newret; | |
1565 | } | |
1566 | if (ret < 0) { | |
1567 | SYSERROR("Error prepending header"); | |
3ce74686 SH |
1568 | return false; |
1569 | } | |
1570 | return true; | |
1571 | } | |
1572 | ||
4df7f012 SH |
1573 | static void lxcapi_clear_config(struct lxc_container *c) |
1574 | { | |
f979ac15 SH |
1575 | if (c) { |
1576 | if (c->lxc_conf) { | |
1577 | lxc_conf_free(c->lxc_conf); | |
1578 | c->lxc_conf = NULL; | |
1579 | } | |
4df7f012 SH |
1580 | } |
1581 | } | |
1582 | ||
858377e4 SH |
1583 | #define do_lxcapi_clear_config(c) lxcapi_clear_config(c) |
1584 | ||
96b3cb40 SH |
1585 | /* |
1586 | * lxcapi_create: | |
1587 | * create a container with the given parameters. | |
1588 | * @c: container to be created. It has the lxcpath, name, and a starting | |
1589 | * configuration already set | |
1590 | * @t: the template to execute to instantiate the root filesystem and | |
1591 | * adjust the configuration. | |
1592 | * @bdevtype: backing store type to use. If NULL, dir will be used. | |
1593 | * @specs: additional parameters for the backing store, i.e. LVM vg to | |
1594 | * use. | |
1595 | * | |
1596 | * @argv: the arguments to pass to the template, terminated by NULL. If no | |
1597 | * arguments, you can just pass NULL. | |
1598 | */ | |
858377e4 | 1599 | static bool do_lxcapi_create(struct lxc_container *c, const char *t, |
dc23c1c8 | 1600 | const char *bdevtype, struct bdev_specs *specs, int flags, |
96b3cb40 SH |
1601 | char *const argv[]) |
1602 | { | |
a69aad27 | 1603 | bool ret = false; |
96b3cb40 | 1604 | pid_t pid; |
85db5535 | 1605 | char *tpath = NULL; |
cbee8106 | 1606 | int partial_fd; |
96b3cb40 SH |
1607 | |
1608 | if (!c) | |
1609 | return false; | |
1610 | ||
85db5535 DE |
1611 | if (t) { |
1612 | tpath = get_template_path(t); | |
1613 | if (!tpath) { | |
959aee9c | 1614 | ERROR("bad template: %s", t); |
85db5535 DE |
1615 | goto out; |
1616 | } | |
96b3cb40 SH |
1617 | } |
1618 | ||
cf465fe4 SH |
1619 | /* |
1620 | * If a template is passed in, and the rootfs already is defined in | |
1621 | * the container config and exists, then * caller is trying to create | |
1622 | * an existing container. Return an error, but do NOT delete the | |
1623 | * container. | |
1624 | */ | |
858377e4 | 1625 | if (do_lxcapi_is_defined(c) && c->lxc_conf && c->lxc_conf->rootfs.path && |
cf465fe4 SH |
1626 | access(c->lxc_conf->rootfs.path, F_OK) == 0 && tpath) { |
1627 | ERROR("Container %s:%s already exists", c->config_path, c->name); | |
6c6892b5 | 1628 | goto free_tpath; |
cf465fe4 SH |
1629 | } |
1630 | ||
6c6892b5 | 1631 | if (!c->lxc_conf) { |
858377e4 | 1632 | if (!do_lxcapi_load_config(c, lxc_global_config_value("lxc.default_config"))) { |
959aee9c | 1633 | ERROR("Error loading default configuration file %s", lxc_global_config_value("lxc.default_config")); |
6c6892b5 DE |
1634 | goto free_tpath; |
1635 | } | |
96b3cb40 SH |
1636 | } |
1637 | ||
6c6892b5 DE |
1638 | if (!create_container_dir(c)) |
1639 | goto free_tpath; | |
1640 | ||
0590e82c | 1641 | /* |
0590e82c SH |
1642 | * if both template and rootfs.path are set, template is setup as rootfs.path. |
1643 | * container is already created if we have a config and rootfs.path is accessible | |
1644 | */ | |
00370edd DW |
1645 | if (!c->lxc_conf->rootfs.path && !tpath) { |
1646 | /* no template passed in and rootfs does not exist */ | |
1647 | if (!c->save_config(c, NULL)) { | |
1648 | ERROR("failed to save starting configuration for %s\n", c->name); | |
1649 | goto out; | |
1650 | } | |
1651 | ret = true; | |
0590e82c | 1652 | goto out; |
00370edd | 1653 | } |
0590e82c SH |
1654 | if (c->lxc_conf->rootfs.path && access(c->lxc_conf->rootfs.path, F_OK) != 0) |
1655 | /* rootfs passed into configuration, but does not exist: error */ | |
1656 | goto out; | |
858377e4 | 1657 | if (do_lxcapi_is_defined(c) && c->lxc_conf->rootfs.path && !tpath) { |
0590e82c SH |
1658 | /* Rootfs already existed, user just wanted to save the |
1659 | * loaded configuration */ | |
0f4cdd77 DW |
1660 | if (!c->save_config(c, NULL)) |
1661 | ERROR("failed to save starting configuration for %s\n", c->name); | |
0590e82c SH |
1662 | ret = true; |
1663 | goto out; | |
a69aad27 | 1664 | } |
96b3cb40 SH |
1665 | |
1666 | /* Mark that this container is being created */ | |
1667 | if ((partial_fd = create_partial(c)) < 0) | |
1668 | goto out; | |
1669 | ||
1670 | /* no need to get disk lock bc we have the partial locked */ | |
1671 | ||
1672 | /* | |
1673 | * Create the backing store | |
1674 | * Note we can't do this in the same task as we use to execute the | |
1675 | * template because of the way zfs works. | |
1676 | * After you 'zfs create', zfs mounts the fs only in the initial | |
1677 | * namespace. | |
1678 | */ | |
1679 | pid = fork(); | |
1680 | if (pid < 0) { | |
959aee9c | 1681 | SYSERROR("failed to fork task for container creation template"); |
8eb5694b SH |
1682 | goto out_unlock; |
1683 | } | |
1684 | ||
96b3cb40 | 1685 | if (pid == 0) { // child |
10bc1861 | 1686 | struct lxc_storage *bdev = NULL; |
96b3cb40 | 1687 | |
10bc1861 CB |
1688 | bdev = do_storage_create(c, bdevtype, specs); |
1689 | if (!bdev) { | |
96b3cb40 SH |
1690 | ERROR("Error creating backing store type %s for %s", |
1691 | bdevtype ? bdevtype : "(none)", c->name); | |
10bc1861 | 1692 | exit(EXIT_FAILURE); |
96b3cb40 SH |
1693 | } |
1694 | ||
1695 | /* save config file again to store the new rootfs location */ | |
858377e4 | 1696 | if (!do_lxcapi_save_config(c, NULL)) { |
959aee9c | 1697 | ERROR("failed to save starting configuration for %s", c->name); |
96b3cb40 SH |
1698 | // parent task won't see bdev in config so we delete it |
1699 | bdev->ops->umount(bdev); | |
1700 | bdev->ops->destroy(bdev); | |
10bc1861 | 1701 | exit(EXIT_FAILURE); |
96b3cb40 | 1702 | } |
10bc1861 | 1703 | exit(EXIT_SUCCESS); |
96b3cb40 SH |
1704 | } |
1705 | if (wait_for_pid(pid) != 0) | |
a09295f8 | 1706 | goto out_unlock; |
96b3cb40 SH |
1707 | |
1708 | /* reload config to get the rootfs */ | |
a3b47c09 | 1709 | lxc_conf_free(c->lxc_conf); |
96b3cb40 SH |
1710 | c->lxc_conf = NULL; |
1711 | if (!load_config_locked(c, c->configfile)) | |
a09295f8 | 1712 | goto out_unlock; |
96b3cb40 | 1713 | |
dc23c1c8 | 1714 | if (!create_run_template(c, tpath, !!(flags & LXC_CREATE_QUIET), argv)) |
96b3cb40 SH |
1715 | goto out_unlock; |
1716 | ||
8eb5694b SH |
1717 | // now clear out the lxc_conf we have, reload from the created |
1718 | // container | |
858377e4 | 1719 | do_lxcapi_clear_config(c); |
3ce74686 | 1720 | |
9d65a487 KY |
1721 | if (t) { |
1722 | if (!prepend_lxc_header(c->configfile, tpath, argv)) { | |
1723 | ERROR("Error prepending header to configuration file"); | |
1724 | goto out_unlock; | |
1725 | } | |
3ce74686 | 1726 | } |
a69aad27 | 1727 | ret = load_config_locked(c, c->configfile); |
72d0e1cb SG |
1728 | |
1729 | out_unlock: | |
3e625e2d SH |
1730 | if (partial_fd >= 0) |
1731 | remove_partial(c, partial_fd); | |
72d0e1cb | 1732 | out: |
c55d4505 | 1733 | if (!ret) |
17a367d8 | 1734 | container_destroy(c, NULL); |
6c6892b5 | 1735 | free_tpath: |
f10fad2f | 1736 | free(tpath); |
a69aad27 | 1737 | return ret; |
72d0e1cb SG |
1738 | } |
1739 | ||
858377e4 SH |
1740 | static bool lxcapi_create(struct lxc_container *c, const char *t, |
1741 | const char *bdevtype, struct bdev_specs *specs, int flags, | |
1742 | char *const argv[]) | |
1743 | { | |
1744 | bool ret; | |
1745 | current_config = c ? c->lxc_conf : NULL; | |
1746 | ret = do_lxcapi_create(c, t, bdevtype, specs, flags, argv); | |
1747 | current_config = NULL; | |
1748 | return ret; | |
1749 | } | |
1750 | ||
1751 | static bool do_lxcapi_reboot(struct lxc_container *c) | |
3e625e2d SH |
1752 | { |
1753 | pid_t pid; | |
dd267776 | 1754 | int rebootsignal = SIGINT; |
3e625e2d SH |
1755 | |
1756 | if (!c) | |
1757 | return false; | |
858377e4 | 1758 | if (!do_lxcapi_is_running(c)) |
3e625e2d | 1759 | return false; |
858377e4 | 1760 | pid = do_lxcapi_init_pid(c); |
3e625e2d SH |
1761 | if (pid <= 0) |
1762 | return false; | |
dd267776 BP |
1763 | if (c->lxc_conf && c->lxc_conf->rebootsignal) |
1764 | rebootsignal = c->lxc_conf->rebootsignal; | |
591614a7 CB |
1765 | if (kill(pid, rebootsignal) < 0) { |
1766 | WARN("Could not send signal %d to pid %d.", rebootsignal, pid); | |
3e625e2d | 1767 | return false; |
591614a7 | 1768 | } |
3e625e2d SH |
1769 | return true; |
1770 | ||
1771 | } | |
1772 | ||
858377e4 SH |
1773 | WRAP_API(bool, lxcapi_reboot) |
1774 | ||
1775 | static bool do_lxcapi_shutdown(struct lxc_container *c, int timeout) | |
72d0e1cb | 1776 | { |
92e35018 CB |
1777 | int ret, state_client_fd = -1; |
1778 | bool retv = false; | |
72d0e1cb | 1779 | pid_t pid; |
f0f1d8c0 | 1780 | int haltsignal = SIGPWR; |
92e35018 | 1781 | lxc_state_t states[MAX_STATE] = {0}; |
72d0e1cb SG |
1782 | |
1783 | if (!c) | |
1784 | return false; | |
1785 | ||
858377e4 | 1786 | if (!do_lxcapi_is_running(c)) |
72d0e1cb | 1787 | return true; |
858377e4 | 1788 | pid = do_lxcapi_init_pid(c); |
72d0e1cb SG |
1789 | if (pid <= 0) |
1790 | return true; | |
330ae3d3 CB |
1791 | |
1792 | /* Detect whether we should send SIGRTMIN + 3 (e.g. systemd). */ | |
1793 | if (task_blocking_signal(pid, (SIGRTMIN + 3))) | |
1794 | haltsignal = (SIGRTMIN + 3); | |
1795 | ||
b0227444 | 1796 | if (c->lxc_conf && c->lxc_conf->haltsignal) |
f0f1d8c0 | 1797 | haltsignal = c->lxc_conf->haltsignal; |
330ae3d3 CB |
1798 | |
1799 | INFO("Using signal number '%d' as halt signal.", haltsignal); | |
1800 | ||
92e35018 CB |
1801 | /* Add a new state client before sending the shutdown signal so that we |
1802 | * don't miss a state. | |
1803 | */ | |
1804 | states[STOPPED] = 1; | |
1805 | ret = lxc_cmd_add_state_client(c->name, c->config_path, states, | |
1806 | &state_client_fd); | |
1807 | ||
1808 | /* Send shutdown signal to container. */ | |
591614a7 CB |
1809 | if (kill(pid, haltsignal) < 0) |
1810 | WARN("Could not send signal %d to pid %d.", haltsignal, pid); | |
1811 | ||
92e35018 CB |
1812 | /* Retrieve the state. */ |
1813 | if (state_client_fd >= 0) { | |
1814 | int state; | |
1815 | state = lxc_cmd_sock_rcv_state(state_client_fd, timeout); | |
1816 | close(state_client_fd); | |
1817 | if (state != STOPPED) | |
1818 | return false; | |
1819 | retv = true; | |
1820 | } else if (ret == STOPPED) { | |
1821 | TRACE("Container is already stopped"); | |
1822 | retv = true; | |
1823 | } else { | |
1824 | TRACE("Received state \"%s\" instead of expected \"STOPPED\"", | |
1825 | lxc_state2str(ret)); | |
1826 | } | |
1827 | ||
72d0e1cb SG |
1828 | return retv; |
1829 | } | |
1830 | ||
858377e4 SH |
1831 | WRAP_API_1(bool, lxcapi_shutdown, int) |
1832 | ||
1897e3bc | 1833 | static bool lxcapi_createl(struct lxc_container *c, const char *t, |
dc23c1c8 | 1834 | const char *bdevtype, struct bdev_specs *specs, int flags, ...) |
72d0e1cb SG |
1835 | { |
1836 | bool bret = false; | |
a0e93eeb | 1837 | char **args = NULL; |
72d0e1cb | 1838 | va_list ap; |
72d0e1cb SG |
1839 | |
1840 | if (!c) | |
1841 | return false; | |
1842 | ||
858377e4 SH |
1843 | current_config = c->lxc_conf; |
1844 | ||
72d0e1cb SG |
1845 | /* |
1846 | * since we're going to wait for create to finish, I don't think we | |
1847 | * need to get a copy of the arguments. | |
1848 | */ | |
dc23c1c8 | 1849 | va_start(ap, flags); |
a0e93eeb | 1850 | args = lxc_va_arg_list_to_argv(ap, 0, 0); |
72d0e1cb | 1851 | va_end(ap); |
a0e93eeb CS |
1852 | if (!args) { |
1853 | ERROR("Memory allocation error."); | |
1854 | goto out; | |
1855 | } | |
72d0e1cb | 1856 | |
858377e4 | 1857 | bret = do_lxcapi_create(c, t, bdevtype, specs, flags, args); |
72d0e1cb SG |
1858 | |
1859 | out: | |
a0e93eeb | 1860 | free(args); |
858377e4 | 1861 | current_config = NULL; |
72d0e1cb SG |
1862 | return bret; |
1863 | } | |
1864 | ||
6b0d5538 SH |
1865 | static void do_clear_unexp_config_line(struct lxc_conf *conf, const char *key) |
1866 | { | |
4222a9f4 CB |
1867 | if (!strcmp(key, "lxc.cgroup")) |
1868 | return clear_unexp_config_line(conf, key, true); | |
1869 | ||
1870 | if (!strcmp(key, "lxc.network")) | |
1871 | return clear_unexp_config_line(conf, key, true); | |
1872 | ||
1873 | if (!strcmp(key, "lxc.net")) | |
1874 | return clear_unexp_config_line(conf, key, true); | |
1875 | ||
1876 | /* Clear a network with a specific index. */ | |
1877 | if (!strncmp(key, "lxc.net.", 8)) { | |
1878 | int ret; | |
1879 | const char *idx; | |
1880 | ||
1881 | idx = key + 8; | |
1882 | ret = lxc_safe_uint(idx, &(unsigned int){0}); | |
1883 | if (!ret) | |
1884 | return clear_unexp_config_line(conf, key, true); | |
1885 | } | |
1886 | ||
1887 | if (!strcmp(key, "lxc.hook")) | |
1888 | return clear_unexp_config_line(conf, key, true); | |
1889 | ||
1890 | return clear_unexp_config_line(conf, key, false); | |
6b0d5538 SH |
1891 | } |
1892 | ||
6afd673f CB |
1893 | static bool do_lxcapi_clear_config_item(struct lxc_container *c, |
1894 | const char *key) | |
72d0e1cb | 1895 | { |
6afd673f CB |
1896 | int ret = 1; |
1897 | struct lxc_config_t *config; | |
72d0e1cb SG |
1898 | |
1899 | if (!c || !c->lxc_conf) | |
1900 | return false; | |
6afd673f | 1901 | |
5cee8c50 | 1902 | if (container_mem_lock(c)) |
72d0e1cb | 1903 | return false; |
6afd673f CB |
1904 | |
1905 | config = lxc_getconfig(key); | |
1906 | /* Verify that the config key exists and that it has a callback | |
1907 | * implemented. | |
1908 | */ | |
1909 | if (config && config->clr) | |
26471403 | 1910 | ret = config->clr(key, c->lxc_conf, NULL); |
6b0d5538 SH |
1911 | if (!ret) |
1912 | do_clear_unexp_config_line(c->lxc_conf, key); | |
6afd673f | 1913 | |
5cee8c50 | 1914 | container_mem_unlock(c); |
72d0e1cb SG |
1915 | return ret == 0; |
1916 | } | |
1917 | ||
858377e4 SH |
1918 | WRAP_API_1(bool, lxcapi_clear_config_item, const char *) |
1919 | ||
e0f59189 | 1920 | static inline bool enter_net_ns(struct lxc_container *c) |
51d0854c | 1921 | { |
858377e4 | 1922 | pid_t pid = do_lxcapi_init_pid(c); |
ae22a220 | 1923 | |
0e6e3a41 | 1924 | if ((geteuid() != 0 || (c->lxc_conf && !lxc_list_empty(&c->lxc_conf->id_map))) && access("/proc/self/ns/user", F_OK) == 0) { |
51d0854c DY |
1925 | if (!switch_to_ns(pid, "user")) |
1926 | return false; | |
9c83a661 | 1927 | } |
51d0854c | 1928 | return switch_to_ns(pid, "net"); |
799f29ab ÇO |
1929 | } |
1930 | ||
9c88ff1f ÇO |
1931 | // used by qsort and bsearch functions for comparing names |
1932 | static inline int string_cmp(char **first, char **second) | |
1933 | { | |
1934 | return strcmp(*first, *second); | |
1935 | } | |
1936 | ||
1937 | // used by qsort and bsearch functions for comparing container names | |
1938 | static inline int container_cmp(struct lxc_container **first, struct lxc_container **second) | |
1939 | { | |
1940 | return strcmp((*first)->name, (*second)->name); | |
1941 | } | |
1942 | ||
1943 | static bool add_to_array(char ***names, char *cname, int pos) | |
1944 | { | |
1945 | char **newnames = realloc(*names, (pos+1) * sizeof(char *)); | |
1946 | if (!newnames) { | |
1947 | ERROR("Out of memory"); | |
1948 | return false; | |
1949 | } | |
1950 | ||
1951 | *names = newnames; | |
1952 | newnames[pos] = strdup(cname); | |
1953 | if (!newnames[pos]) | |
1954 | return false; | |
1955 | ||
1956 | // sort the arrray as we will use binary search on it | |
1957 | qsort(newnames, pos + 1, sizeof(char *), (int (*)(const void *,const void *))string_cmp); | |
1958 | ||
1959 | return true; | |
1960 | } | |
1961 | ||
2871830a | 1962 | static bool add_to_clist(struct lxc_container ***list, struct lxc_container *c, int pos, bool sort) |
9c88ff1f ÇO |
1963 | { |
1964 | struct lxc_container **newlist = realloc(*list, (pos+1) * sizeof(struct lxc_container *)); | |
1965 | if (!newlist) { | |
1966 | ERROR("Out of memory"); | |
1967 | return false; | |
1968 | } | |
1969 | ||
1970 | *list = newlist; | |
1971 | newlist[pos] = c; | |
1972 | ||
1973 | // sort the arrray as we will use binary search on it | |
2871830a DE |
1974 | if (sort) |
1975 | qsort(newlist, pos + 1, sizeof(struct lxc_container *), (int (*)(const void *,const void *))container_cmp); | |
9c88ff1f ÇO |
1976 | |
1977 | return true; | |
1978 | } | |
1979 | ||
1980 | static char** get_from_array(char ***names, char *cname, int size) | |
1981 | { | |
1982 | return (char **)bsearch(&cname, *names, size, sizeof(char *), (int (*)(const void *, const void *))string_cmp); | |
1983 | } | |
1984 | ||
1985 | ||
1986 | static bool array_contains(char ***names, char *cname, int size) { | |
1987 | if(get_from_array(names, cname, size) != NULL) | |
1988 | return true; | |
1989 | return false; | |
1990 | } | |
1991 | ||
1992 | static bool remove_from_array(char ***names, char *cname, int size) | |
1993 | { | |
1994 | char **result = get_from_array(names, cname, size); | |
1995 | if (result != NULL) { | |
1996 | free(result); | |
1997 | return true; | |
1998 | } | |
1999 | return false; | |
2000 | } | |
2001 | ||
858377e4 | 2002 | static char ** do_lxcapi_get_interfaces(struct lxc_container *c) |
799f29ab | 2003 | { |
ae22a220 ÇO |
2004 | pid_t pid; |
2005 | int i, count = 0, pipefd[2]; | |
9c88ff1f | 2006 | char **interfaces = NULL; |
ae22a220 | 2007 | char interface[IFNAMSIZ]; |
799f29ab | 2008 | |
ae22a220 ÇO |
2009 | if(pipe(pipefd) < 0) { |
2010 | SYSERROR("pipe failed"); | |
2011 | return NULL; | |
c868b261 ÇO |
2012 | } |
2013 | ||
ae22a220 ÇO |
2014 | pid = fork(); |
2015 | if (pid < 0) { | |
959aee9c | 2016 | SYSERROR("failed to fork task to get interfaces information"); |
ae22a220 ÇO |
2017 | close(pipefd[0]); |
2018 | close(pipefd[1]); | |
2019 | return NULL; | |
2020 | } | |
799f29ab | 2021 | |
ae22a220 ÇO |
2022 | if (pid == 0) { // child |
2023 | int ret = 1, nbytes; | |
2024 | struct ifaddrs *interfaceArray = NULL, *tempIfAddr = NULL; | |
2025 | ||
2026 | /* close the read-end of the pipe */ | |
2027 | close(pipefd[0]); | |
2028 | ||
e0f59189 | 2029 | if (!enter_net_ns(c)) { |
ae22a220 ÇO |
2030 | SYSERROR("failed to enter namespace"); |
2031 | goto out; | |
2032 | } | |
2033 | ||
2034 | /* Grab the list of interfaces */ | |
2035 | if (getifaddrs(&interfaceArray)) { | |
2036 | SYSERROR("failed to get interfaces list"); | |
2037 | goto out; | |
2038 | } | |
2039 | ||
2040 | /* Iterate through the interfaces */ | |
2041 | for (tempIfAddr = interfaceArray; tempIfAddr != NULL; tempIfAddr = tempIfAddr->ifa_next) { | |
2042 | nbytes = write(pipefd[1], tempIfAddr->ifa_name, IFNAMSIZ); | |
2043 | if (nbytes < 0) { | |
2044 | ERROR("write failed"); | |
2045 | goto out; | |
2046 | } | |
2047 | count++; | |
2048 | } | |
2049 | ret = 0; | |
2050 | ||
2051 | out: | |
2052 | if (interfaceArray) | |
2053 | freeifaddrs(interfaceArray); | |
2054 | ||
2055 | /* close the write-end of the pipe, thus sending EOF to the reader */ | |
2056 | close(pipefd[1]); | |
2057 | exit(ret); | |
799f29ab ÇO |
2058 | } |
2059 | ||
ae22a220 ÇO |
2060 | /* close the write-end of the pipe */ |
2061 | close(pipefd[1]); | |
2062 | ||
358afd84 | 2063 | while (read(pipefd[0], &interface, IFNAMSIZ) == IFNAMSIZ) { |
ae22a220 ÇO |
2064 | if (array_contains(&interfaces, interface, count)) |
2065 | continue; | |
799f29ab | 2066 | |
ae22a220 ÇO |
2067 | if(!add_to_array(&interfaces, interface, count)) |
2068 | ERROR("PARENT: add_to_array failed"); | |
9c88ff1f ÇO |
2069 | count++; |
2070 | } | |
799f29ab | 2071 | |
ae22a220 ÇO |
2072 | if (wait_for_pid(pid) != 0) { |
2073 | for(i=0;i<count;i++) | |
2074 | free(interfaces[i]); | |
2075 | free(interfaces); | |
2076 | interfaces = NULL; | |
2077 | } | |
9c88ff1f | 2078 | |
ae22a220 ÇO |
2079 | /* close the read-end of the pipe */ |
2080 | close(pipefd[0]); | |
799f29ab | 2081 | |
9c88ff1f ÇO |
2082 | /* Append NULL to the array */ |
2083 | if(interfaces) | |
2084 | interfaces = (char **)lxc_append_null_to_array((void **)interfaces, count); | |
799f29ab | 2085 | |
9c88ff1f | 2086 | return interfaces; |
799f29ab ÇO |
2087 | } |
2088 | ||
858377e4 SH |
2089 | WRAP_API(char **, lxcapi_get_interfaces) |
2090 | ||
2091 | static char** do_lxcapi_get_ips(struct lxc_container *c, const char* interface, const char* family, int scope) | |
799f29ab | 2092 | { |
ae22a220 ÇO |
2093 | pid_t pid; |
2094 | int i, count = 0, pipefd[2]; | |
9c88ff1f | 2095 | char **addresses = NULL; |
ae22a220 | 2096 | char address[INET6_ADDRSTRLEN]; |
799f29ab | 2097 | |
ae22a220 ÇO |
2098 | if(pipe(pipefd) < 0) { |
2099 | SYSERROR("pipe failed"); | |
2100 | return NULL; | |
c868b261 ÇO |
2101 | } |
2102 | ||
ae22a220 ÇO |
2103 | pid = fork(); |
2104 | if (pid < 0) { | |
959aee9c | 2105 | SYSERROR("failed to fork task to get container ips"); |
ae22a220 ÇO |
2106 | close(pipefd[0]); |
2107 | close(pipefd[1]); | |
2108 | return NULL; | |
9c83a661 SG |
2109 | } |
2110 | ||
ae22a220 ÇO |
2111 | if (pid == 0) { // child |
2112 | int ret = 1, nbytes; | |
2113 | struct ifaddrs *interfaceArray = NULL, *tempIfAddr = NULL; | |
2114 | char addressOutputBuffer[INET6_ADDRSTRLEN]; | |
2115 | void *tempAddrPtr = NULL; | |
2116 | char *address = NULL; | |
fe218ca3 | 2117 | |
ae22a220 ÇO |
2118 | /* close the read-end of the pipe */ |
2119 | close(pipefd[0]); | |
2120 | ||
e0f59189 | 2121 | if (!enter_net_ns(c)) { |
ae22a220 ÇO |
2122 | SYSERROR("failed to enter namespace"); |
2123 | goto out; | |
9c83a661 | 2124 | } |
ae22a220 ÇO |
2125 | |
2126 | /* Grab the list of interfaces */ | |
2127 | if (getifaddrs(&interfaceArray)) { | |
2128 | SYSERROR("failed to get interfaces list"); | |
2129 | goto out; | |
2130 | } | |
2131 | ||
2132 | /* Iterate through the interfaces */ | |
2133 | for (tempIfAddr = interfaceArray; tempIfAddr != NULL; tempIfAddr = tempIfAddr->ifa_next) { | |
2134 | if (tempIfAddr->ifa_addr == NULL) | |
9c83a661 SG |
2135 | continue; |
2136 | ||
ae22a220 ÇO |
2137 | if(tempIfAddr->ifa_addr->sa_family == AF_INET) { |
2138 | if (family && strcmp(family, "inet")) | |
2139 | continue; | |
2140 | tempAddrPtr = &((struct sockaddr_in *)tempIfAddr->ifa_addr)->sin_addr; | |
2141 | } | |
2142 | else { | |
2143 | if (family && strcmp(family, "inet6")) | |
2144 | continue; | |
2145 | ||
2146 | if (((struct sockaddr_in6 *)tempIfAddr->ifa_addr)->sin6_scope_id != scope) | |
2147 | continue; | |
2148 | ||
2149 | tempAddrPtr = &((struct sockaddr_in6 *)tempIfAddr->ifa_addr)->sin6_addr; | |
2150 | } | |
2151 | ||
2152 | if (interface && strcmp(interface, tempIfAddr->ifa_name)) | |
2153 | continue; | |
2154 | else if (!interface && strcmp("lo", tempIfAddr->ifa_name) == 0) | |
9c83a661 SG |
2155 | continue; |
2156 | ||
ae22a220 ÇO |
2157 | address = (char *)inet_ntop(tempIfAddr->ifa_addr->sa_family, |
2158 | tempAddrPtr, | |
2159 | addressOutputBuffer, | |
2160 | sizeof(addressOutputBuffer)); | |
2161 | if (!address) | |
2162 | continue; | |
2163 | ||
2164 | nbytes = write(pipefd[1], address, INET6_ADDRSTRLEN); | |
2165 | if (nbytes < 0) { | |
2166 | ERROR("write failed"); | |
2167 | goto out; | |
2168 | } | |
2169 | count++; | |
9c83a661 | 2170 | } |
ae22a220 | 2171 | ret = 0; |
9c83a661 | 2172 | |
ae22a220 ÇO |
2173 | out: |
2174 | if(interfaceArray) | |
2175 | freeifaddrs(interfaceArray); | |
9c83a661 | 2176 | |
ae22a220 ÇO |
2177 | /* close the write-end of the pipe, thus sending EOF to the reader */ |
2178 | close(pipefd[1]); | |
2179 | exit(ret); | |
6849cb5b | 2180 | } |
9c83a661 | 2181 | |
ae22a220 ÇO |
2182 | /* close the write-end of the pipe */ |
2183 | close(pipefd[1]); | |
2184 | ||
358afd84 | 2185 | while (read(pipefd[0], &address, INET6_ADDRSTRLEN) == INET6_ADDRSTRLEN) { |
9c88ff1f | 2186 | if(!add_to_array(&addresses, address, count)) |
ae22a220 | 2187 | ERROR("PARENT: add_to_array failed"); |
9c88ff1f | 2188 | count++; |
9c83a661 SG |
2189 | } |
2190 | ||
ae22a220 ÇO |
2191 | if (wait_for_pid(pid) != 0) { |
2192 | for(i=0;i<count;i++) | |
2193 | free(addresses[i]); | |
2194 | free(addresses); | |
2195 | addresses = NULL; | |
2196 | } | |
9c83a661 | 2197 | |
ae22a220 ÇO |
2198 | /* close the read-end of the pipe */ |
2199 | close(pipefd[0]); | |
9c83a661 SG |
2200 | |
2201 | /* Append NULL to the array */ | |
9c88ff1f ÇO |
2202 | if(addresses) |
2203 | addresses = (char **)lxc_append_null_to_array((void **)addresses, count); | |
9c83a661 SG |
2204 | |
2205 | return addresses; | |
2206 | } | |
2207 | ||
858377e4 SH |
2208 | WRAP_API_3(char **, lxcapi_get_ips, const char *, const char *, int) |
2209 | ||
2210 | static int do_lxcapi_get_config_item(struct lxc_container *c, const char *key, char *retv, int inlen) | |
72d0e1cb | 2211 | { |
fce687aa CB |
2212 | int ret = -1; |
2213 | struct lxc_config_t *config; | |
72d0e1cb SG |
2214 | |
2215 | if (!c || !c->lxc_conf) | |
2216 | return -1; | |
fce687aa | 2217 | |
5cee8c50 | 2218 | if (container_mem_lock(c)) |
72d0e1cb | 2219 | return -1; |
fce687aa CB |
2220 | |
2221 | config = lxc_getconfig(key); | |
2222 | /* Verify that the config key exists and that it has a callback | |
2223 | * implemented. | |
2224 | */ | |
2225 | if (config && config->get) | |
cccd2219 | 2226 | ret = config->get(key, retv, inlen, c->lxc_conf, NULL); |
fce687aa | 2227 | |
5cee8c50 | 2228 | container_mem_unlock(c); |
72d0e1cb SG |
2229 | return ret; |
2230 | } | |
2231 | ||
858377e4 SH |
2232 | WRAP_API_3(int, lxcapi_get_config_item, const char *, char *, int) |
2233 | ||
2234 | static char* do_lxcapi_get_running_config_item(struct lxc_container *c, const char *key) | |
8ac18377 ÇO |
2235 | { |
2236 | char *ret; | |
2237 | ||
2238 | if (!c || !c->lxc_conf) | |
2239 | return NULL; | |
2240 | if (container_mem_lock(c)) | |
2241 | return NULL; | |
858377e4 | 2242 | ret = lxc_cmd_get_config_item(c->name, key, do_lxcapi_get_config_path(c)); |
8ac18377 ÇO |
2243 | container_mem_unlock(c); |
2244 | return ret; | |
2245 | } | |
2246 | ||
858377e4 SH |
2247 | WRAP_API_1(char *, lxcapi_get_running_config_item, const char *) |
2248 | ||
2249 | static int do_lxcapi_get_keys(struct lxc_container *c, const char *key, char *retv, int inlen) | |
72d0e1cb SG |
2250 | { |
2251 | if (!key) | |
2252 | return lxc_listconfigs(retv, inlen); | |
2253 | /* | |
7fa3f2e9 | 2254 | * Support 'lxc.net.<idx>', i.e. 'lxc.net.0' |
72d0e1cb SG |
2255 | * This is an intelligent result to show which keys are valid given |
2256 | * the type of nic it is | |
2257 | */ | |
2258 | if (!c || !c->lxc_conf) | |
2259 | return -1; | |
5cee8c50 | 2260 | if (container_mem_lock(c)) |
72d0e1cb SG |
2261 | return -1; |
2262 | int ret = -1; | |
f9373e40 | 2263 | if (strncmp(key, "lxc.net.", 8) == 0) |
01f55c40 | 2264 | ret = lxc_list_net(c->lxc_conf, key, retv, inlen); |
f9373e40 CB |
2265 | else if (strncmp(key, "lxc.network.", 12) == 0) |
2266 | ret = lxc_list_nicconfigs_legacy(c->lxc_conf, key, retv, inlen); | |
5cee8c50 | 2267 | container_mem_unlock(c); |
72d0e1cb SG |
2268 | return ret; |
2269 | } | |
2270 | ||
858377e4 SH |
2271 | WRAP_API_3(int, lxcapi_get_keys, const char *, char *, int) |
2272 | ||
2273 | static bool do_lxcapi_save_config(struct lxc_container *c, const char *alt_file) | |
72d0e1cb | 2274 | { |
39dc698c SH |
2275 | FILE *fout; |
2276 | bool ret = false, need_disklock = false; | |
2277 | int lret; | |
2278 | ||
72d0e1cb SG |
2279 | if (!alt_file) |
2280 | alt_file = c->configfile; | |
2281 | if (!alt_file) | |
6849cb5b | 2282 | return false; // should we write to stdout if no file is specified? |
39dc698c SH |
2283 | |
2284 | // If we haven't yet loaded a config, load the stock config | |
2285 | if (!c->lxc_conf) { | |
858377e4 | 2286 | if (!do_lxcapi_load_config(c, lxc_global_config_value("lxc.default_config"))) { |
959aee9c | 2287 | ERROR("Error loading default configuration file %s while saving %s", lxc_global_config_value("lxc.default_config"), c->name); |
72d0e1cb SG |
2288 | return false; |
2289 | } | |
39dc698c | 2290 | } |
72d0e1cb | 2291 | |
5a3d2e1e SG |
2292 | if (!create_container_dir(c)) |
2293 | return false; | |
2294 | ||
39dc698c SH |
2295 | /* |
2296 | * If we're writing to the container's config file, take the | |
2297 | * disk lock. Otherwise just take the memlock to protect the | |
2298 | * struct lxc_container while we're traversing it. | |
2299 | */ | |
2300 | if (strcmp(c->configfile, alt_file) == 0) | |
2301 | need_disklock = true; | |
2302 | ||
2303 | if (need_disklock) | |
2304 | lret = container_disk_lock(c); | |
2305 | else | |
2306 | lret = container_mem_lock(c); | |
2307 | ||
2308 | if (lret) | |
72d0e1cb | 2309 | return false; |
39dc698c SH |
2310 | |
2311 | fout = fopen(alt_file, "w"); | |
2312 | if (!fout) | |
2313 | goto out; | |
6b0d5538 | 2314 | write_config(fout, c->lxc_conf); |
72d0e1cb | 2315 | fclose(fout); |
39dc698c SH |
2316 | ret = true; |
2317 | ||
2318 | out: | |
2319 | if (need_disklock) | |
2320 | container_disk_unlock(c); | |
2321 | else | |
2322 | container_mem_unlock(c); | |
2323 | return ret; | |
72d0e1cb SG |
2324 | } |
2325 | ||
858377e4 SH |
2326 | WRAP_API_1(bool, lxcapi_save_config, const char *) |
2327 | ||
0ea055b3 CB |
2328 | |
2329 | static bool mod_rdep(struct lxc_container *c0, struct lxc_container *c, bool inc) | |
dfb31b25 | 2330 | { |
0ea055b3 CB |
2331 | FILE *f1; |
2332 | struct stat fbuf; | |
42342bed CB |
2333 | void *buf = NULL; |
2334 | char *del = NULL; | |
dfb31b25 | 2335 | char path[MAXPATHLEN]; |
0ea055b3 CB |
2336 | char newpath[MAXPATHLEN]; |
2337 | int fd, ret, n = 0, v = 0; | |
dfb31b25 | 2338 | bool bret = false; |
42342bed | 2339 | size_t len = 0, bytes = 0; |
dfb31b25 | 2340 | |
0ea055b3 | 2341 | if (container_disk_lock(c0)) |
dfb31b25 | 2342 | return false; |
0ea055b3 CB |
2343 | |
2344 | ret = snprintf(path, MAXPATHLEN, "%s/%s/lxc_snapshots", c0->config_path, c0->name); | |
dfb31b25 SH |
2345 | if (ret < 0 || ret > MAXPATHLEN) |
2346 | goto out; | |
0ea055b3 CB |
2347 | ret = snprintf(newpath, MAXPATHLEN, "%s\n%s\n", c->config_path, c->name); |
2348 | if (ret < 0 || ret > MAXPATHLEN) | |
dfb31b25 | 2349 | goto out; |
0ea055b3 CB |
2350 | |
2351 | /* If we find an lxc-snapshot file using the old format only listing the | |
2352 | * number of snapshots we will keep using it. */ | |
2353 | f1 = fopen(path, "r"); | |
2354 | if (f1) { | |
2355 | n = fscanf(f1, "%d", &v); | |
2356 | fclose(f1); | |
2357 | if (n == 1 && v == 0) { | |
2358 | remove(path); | |
2359 | n = 0; | |
2360 | } | |
dfb31b25 | 2361 | } |
0ea055b3 CB |
2362 | if (n == 1) { |
2363 | v += inc ? 1 : -1; | |
2364 | f1 = fopen(path, "w"); | |
2365 | if (!f1) | |
2366 | goto out; | |
2367 | if (fprintf(f1, "%d\n", v) < 0) { | |
2368 | ERROR("Error writing new snapshots value"); | |
2369 | fclose(f1); | |
2370 | goto out; | |
2371 | } | |
2372 | ret = fclose(f1); | |
2373 | if (ret != 0) { | |
2374 | SYSERROR("Error writing to or closing snapshots file"); | |
2375 | goto out; | |
2376 | } | |
2377 | } else { | |
2378 | /* Here we know that we have or can use an lxc-snapshot file | |
2379 | * using the new format. */ | |
2380 | if (inc) { | |
2381 | f1 = fopen(path, "a"); | |
2382 | if (!f1) | |
2383 | goto out; | |
2384 | ||
2385 | if (fprintf(f1, "%s", newpath) < 0) { | |
2386 | ERROR("Error writing new snapshots entry"); | |
2387 | ret = fclose(f1); | |
2388 | if (ret != 0) | |
2389 | SYSERROR("Error writing to or closing snapshots file"); | |
2390 | goto out; | |
2391 | } | |
2392 | ||
2393 | ret = fclose(f1); | |
2394 | if (ret != 0) { | |
2395 | SYSERROR("Error writing to or closing snapshots file"); | |
2396 | goto out; | |
2397 | } | |
2398 | } else if (!inc) { | |
d028235d SG |
2399 | if ((fd = open(path, O_RDWR | O_CLOEXEC)) < 0) |
2400 | goto out; | |
2401 | ||
2402 | if (fstat(fd, &fbuf) < 0) { | |
2403 | close(fd); | |
2404 | goto out; | |
2405 | } | |
2406 | ||
2407 | if (fbuf.st_size != 0) { | |
d028235d | 2408 | |
25086a5f | 2409 | buf = lxc_strmmap(NULL, fbuf.st_size, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0); |
d028235d SG |
2410 | if (buf == MAP_FAILED) { |
2411 | SYSERROR("Failed to create mapping %s", path); | |
2412 | close(fd); | |
2413 | goto out; | |
2414 | } | |
2415 | ||
2416 | len = strlen(newpath); | |
2417 | while ((del = strstr((char *)buf, newpath))) { | |
2418 | memmove(del, del + len, strlen(del) - len + 1); | |
2419 | bytes += len; | |
2420 | } | |
2421 | ||
25086a5f | 2422 | lxc_strmunmap(buf, fbuf.st_size); |
d028235d SG |
2423 | if (ftruncate(fd, fbuf.st_size - bytes) < 0) { |
2424 | SYSERROR("Failed to truncate file %s", path); | |
2425 | close(fd); | |
2426 | goto out; | |
2427 | } | |
2428 | } | |
2429 | close(fd); | |
2430 | } | |
0ea055b3 CB |
2431 | |
2432 | /* If the lxc-snapshot file is empty, remove it. */ | |
2433 | if (stat(path, &fbuf) < 0) | |
2434 | goto out; | |
d028235d SG |
2435 | if (!fbuf.st_size) { |
2436 | remove(path); | |
0ea055b3 | 2437 | } |
dfb31b25 SH |
2438 | } |
2439 | ||
2440 | bret = true; | |
2441 | ||
2442 | out: | |
0ea055b3 | 2443 | container_disk_unlock(c0); |
dfb31b25 SH |
2444 | return bret; |
2445 | } | |
2446 | ||
2447 | static void strip_newline(char *p) | |
2448 | { | |
2449 | size_t len = strlen(p); | |
2450 | if (len < 1) | |
2451 | return; | |
2452 | if (p[len-1] == '\n') | |
2453 | p[len-1] = '\0'; | |
2454 | } | |
2455 | ||
d825fff3 | 2456 | void mod_all_rdeps(struct lxc_container *c, bool inc) |
dfb31b25 SH |
2457 | { |
2458 | struct lxc_container *p; | |
2459 | char *lxcpath = NULL, *lxcname = NULL, path[MAXPATHLEN]; | |
2460 | size_t pathlen = 0, namelen = 0; | |
2461 | FILE *f; | |
2462 | int ret; | |
2463 | ||
2464 | ret = snprintf(path, MAXPATHLEN, "%s/%s/lxc_rdepends", | |
2465 | c->config_path, c->name); | |
2466 | if (ret < 0 || ret >= MAXPATHLEN) { | |
2467 | ERROR("Path name too long"); | |
2468 | return; | |
2469 | } | |
025ed0f3 | 2470 | f = fopen(path, "r"); |
025ed0f3 | 2471 | if (f == NULL) |
dfb31b25 SH |
2472 | return; |
2473 | while (getline(&lxcpath, &pathlen, f) != -1) { | |
2474 | if (getline(&lxcname, &namelen, f) == -1) { | |
959aee9c | 2475 | ERROR("badly formatted file %s", path); |
dfb31b25 SH |
2476 | goto out; |
2477 | } | |
2478 | strip_newline(lxcpath); | |
2479 | strip_newline(lxcname); | |
2480 | if ((p = lxc_container_new(lxcname, lxcpath)) == NULL) { | |
2481 | ERROR("Unable to find dependent container %s:%s", | |
2482 | lxcpath, lxcname); | |
2483 | continue; | |
2484 | } | |
0ea055b3 CB |
2485 | if (!mod_rdep(p, c, inc)) |
2486 | ERROR("Failed to update snapshots file for %s:%s", | |
dfb31b25 SH |
2487 | lxcpath, lxcname); |
2488 | lxc_container_put(p); | |
2489 | } | |
2490 | out: | |
f10fad2f ME |
2491 | free(lxcpath); |
2492 | free(lxcname); | |
dfb31b25 SH |
2493 | fclose(f); |
2494 | } | |
2495 | ||
18aa217b | 2496 | static bool has_fs_snapshots(struct lxc_container *c) |
dfb31b25 | 2497 | { |
0ea055b3 | 2498 | FILE *f; |
dfb31b25 SH |
2499 | char path[MAXPATHLEN]; |
2500 | int ret, v; | |
0ea055b3 | 2501 | struct stat fbuf; |
dfb31b25 SH |
2502 | bool bret = false; |
2503 | ||
2504 | ret = snprintf(path, MAXPATHLEN, "%s/%s/lxc_snapshots", c->config_path, | |
2505 | c->name); | |
2506 | if (ret < 0 || ret > MAXPATHLEN) | |
2507 | goto out; | |
0ea055b3 CB |
2508 | /* If the file doesn't exist there are no snapshots. */ |
2509 | if (stat(path, &fbuf) < 0) | |
dfb31b25 | 2510 | goto out; |
0ea055b3 CB |
2511 | v = fbuf.st_size; |
2512 | if (v != 0) { | |
2513 | f = fopen(path, "r"); | |
2514 | if (!f) | |
2515 | goto out; | |
2516 | ret = fscanf(f, "%d", &v); | |
2517 | fclose(f); | |
2518 | // TODO: Figure out what to do with the return value of fscanf. | |
2519 | if (ret != 1) | |
2520 | INFO("Container uses new lxc-snapshots format %s", path); | |
2521 | } | |
dfb31b25 SH |
2522 | bret = v != 0; |
2523 | ||
2524 | out: | |
2525 | return bret; | |
2526 | } | |
2527 | ||
18aa217b SH |
2528 | static bool has_snapshots(struct lxc_container *c) |
2529 | { | |
2530 | char path[MAXPATHLEN]; | |
74f96976 | 2531 | struct dirent *direntp; |
18aa217b SH |
2532 | int count=0; |
2533 | DIR *dir; | |
2534 | ||
2535 | if (!get_snappath_dir(c, path)) | |
2536 | return false; | |
2537 | dir = opendir(path); | |
2538 | if (!dir) | |
2539 | return false; | |
74f96976 | 2540 | while ((direntp = readdir(dir))) { |
18aa217b SH |
2541 | if (!direntp) |
2542 | break; | |
2543 | ||
2544 | if (!strcmp(direntp->d_name, ".")) | |
2545 | continue; | |
2546 | ||
2547 | if (!strcmp(direntp->d_name, "..")) | |
2548 | continue; | |
2549 | count++; | |
2550 | break; | |
2551 | } | |
2552 | closedir(dir); | |
2553 | return count > 0; | |
2554 | } | |
2555 | ||
297c2d58 | 2556 | static bool do_destroy_container(struct lxc_conf *conf) { |
d028235d | 2557 | if (am_unpriv()) { |
10bc1861 CB |
2558 | if (userns_exec_1(conf, storage_destroy_wrapper, conf, |
2559 | "storage_destroy_wrapper") < 0) | |
d028235d SG |
2560 | return false; |
2561 | return true; | |
2562 | } | |
10bc1861 | 2563 | return storage_destroy(conf); |
297c2d58 CB |
2564 | } |
2565 | ||
4355ab5f SH |
2566 | static int lxc_rmdir_onedev_wrapper(void *data) |
2567 | { | |
2568 | char *arg = (char *) data; | |
18aa217b | 2569 | return lxc_rmdir_onedev(arg, "snaps"); |
4355ab5f SH |
2570 | } |
2571 | ||
17a367d8 | 2572 | static int lxc_unlink_exec_wrapper(void *data) |
72d0e1cb | 2573 | { |
17a367d8 CB |
2574 | char *arg = data; |
2575 | return unlink(arg); | |
2576 | } | |
2577 | ||
2578 | static bool container_destroy(struct lxc_container *c, | |
2579 | struct lxc_storage *storage) | |
2580 | { | |
2581 | const char *p1; | |
2582 | size_t len; | |
2583 | struct lxc_conf *conf; | |
2584 | char *path = NULL; | |
c868b261 | 2585 | bool bret = false; |
297c2d58 | 2586 | int ret = 0; |
72d0e1cb | 2587 | |
858377e4 | 2588 | if (!c || !do_lxcapi_is_defined(c)) |
5a3d2e1e SG |
2589 | return false; |
2590 | ||
a70a69e8 | 2591 | conf = c->lxc_conf; |
3bc449ed | 2592 | if (container_disk_lock(c)) |
72d0e1cb | 2593 | return false; |
72d0e1cb | 2594 | |
39dc698c | 2595 | if (!is_stopped(c)) { |
60bf62d4 SH |
2596 | // we should queue some sort of error - in c->error_string? |
2597 | ERROR("container %s is not stopped", c->name); | |
2598 | goto out; | |
72d0e1cb SG |
2599 | } |
2600 | ||
a70a69e8 | 2601 | if (conf && !lxc_list_empty(&conf->hooks[LXCHOOK_DESTROY])) { |
37cf711b | 2602 | /* Start of environment variable setup for hooks */ |
17a367d8 CB |
2603 | if (c->name && setenv("LXC_NAME", c->name, 1)) |
2604 | SYSERROR("Failed to set environment variable for container name"); | |
2605 | ||
2606 | if (conf->rcfile && setenv("LXC_CONFIG_FILE", conf->rcfile, 1)) | |
2607 | SYSERROR("Failed to set environment variable for config path"); | |
2608 | ||
2609 | if (conf->rootfs.mount && setenv("LXC_ROOTFS_MOUNT", conf->rootfs.mount, 1)) | |
2610 | SYSERROR("Failed to set environment variable for rootfs mount"); | |
2611 | ||
2612 | if (conf->rootfs.path && setenv("LXC_ROOTFS_PATH", conf->rootfs.path, 1)) | |
2613 | SYSERROR("Failed to set environment variable for rootfs mount"); | |
2614 | ||
2615 | if (conf->console.path && setenv("LXC_CONSOLE", conf->console.path, 1)) | |
2616 | SYSERROR("Failed to set environment variable for console path"); | |
2617 | ||
2618 | if (conf->console.log_path && setenv("LXC_CONSOLE_LOGPATH", conf->console.log_path, 1)) | |
2619 | SYSERROR("Failed to set environment variable for console log"); | |
37cf711b SY |
2620 | /* End of environment variable setup for hooks */ |
2621 | ||
2622 | if (run_lxc_hooks(c->name, "destroy", conf, c->get_config_path(c), NULL)) { | |
17a367d8 | 2623 | ERROR("Failed to execute clone hook for \"%s\"", c->name); |
37cf711b SY |
2624 | goto out; |
2625 | } | |
2626 | } | |
2627 | ||
2628 | if (current_config && conf == current_config) { | |
858377e4 | 2629 | current_config = NULL; |
37cf711b SY |
2630 | if (conf->logfd != -1) { |
2631 | close(conf->logfd); | |
2632 | conf->logfd = -1; | |
858377e4 SH |
2633 | } |
2634 | } | |
2635 | ||
d028235d SG |
2636 | if (conf && conf->rootfs.path && conf->rootfs.mount) { |
2637 | if (!do_destroy_container(conf)) { | |
2638 | ERROR("Error destroying rootfs for %s", c->name); | |
2639 | goto out; | |
2640 | } | |
2641 | INFO("Destroyed rootfs for %s", c->name); | |
2642 | } | |
60bf62d4 | 2643 | |
dfb31b25 SH |
2644 | mod_all_rdeps(c, false); |
2645 | ||
17a367d8 CB |
2646 | p1 = do_lxcapi_get_config_path(c); |
2647 | /* strlen(p1) | |
2648 | * + | |
2649 | * / | |
2650 | * + | |
2651 | * strlen(c->name) | |
2652 | * + | |
2653 | * / | |
2654 | * + | |
2655 | * strlen("config") = 6 | |
2656 | * + | |
2657 | * \0 | |
2658 | */ | |
2659 | len = strlen(p1) + 1 + strlen(c->name) + 1 + 6 + 1; | |
2660 | path = malloc(len); | |
2661 | if (!path) { | |
2662 | ERROR("Failed to allocate memory"); | |
2663 | goto out; | |
2664 | } | |
2665 | ||
2666 | /* For an overlay container the rootfs is considered immutable and | |
2667 | * cannot be removed when restoring from a snapshot. | |
2668 | */ | |
2669 | if (storage && (!strcmp(storage->type, "overlay") || | |
2670 | !strcmp(storage->type, "overlayfs")) && | |
2671 | (storage->flags & LXC_STORAGE_INTERNAL_OVERLAY_RESTORE)) { | |
2672 | ret = snprintf(path, len, "%s/%s/config", p1, c->name); | |
2673 | if (ret < 0 || (size_t)ret >= len) | |
2674 | goto out; | |
2675 | ||
2676 | if (am_unpriv()) | |
2677 | ret = userns_exec_1(conf, lxc_unlink_exec_wrapper, path, | |
2678 | "lxc_unlink_exec_wrapper"); | |
2679 | else | |
2680 | ret = unlink(path); | |
2681 | if (ret < 0) { | |
2682 | SYSERROR("Failed to destroy config file \"%s\" for \"%s\"", | |
2683 | path, c->name); | |
2684 | goto out; | |
2685 | } | |
2686 | INFO("Destroyed config file \"%s\" for \"%s\"", path, c->name); | |
2687 | ||
2688 | bret = true; | |
2689 | goto out; | |
2690 | } | |
2691 | ||
2692 | ret = snprintf(path, len, "%s/%s", p1, c->name); | |
2693 | if (ret < 0 || (size_t)ret >= len) | |
2694 | goto out; | |
c868b261 | 2695 | if (am_unpriv()) |
c9b7c33e CB |
2696 | ret = userns_exec_1(conf, lxc_rmdir_onedev_wrapper, path, |
2697 | "lxc_rmdir_onedev_wrapper"); | |
4355ab5f | 2698 | else |
18aa217b | 2699 | ret = lxc_rmdir_onedev(path, "snaps"); |
4355ab5f | 2700 | if (ret < 0) { |
17a367d8 CB |
2701 | ERROR("Failed to destroy directory \"%s\" for \"%s\"", path, |
2702 | c->name); | |
60bf62d4 SH |
2703 | goto out; |
2704 | } | |
17a367d8 | 2705 | INFO("Destroyed directory \"%s\" for \"%s\"", path, c->name); |
297c2d58 | 2706 | |
fef48dc9 | 2707 | bret = true; |
60bf62d4 SH |
2708 | |
2709 | out: | |
17a367d8 CB |
2710 | if (path) |
2711 | free(path); | |
3bc449ed | 2712 | container_disk_unlock(c); |
fef48dc9 | 2713 | return bret; |
72d0e1cb SG |
2714 | } |
2715 | ||
858377e4 | 2716 | static bool do_lxcapi_destroy(struct lxc_container *c) |
18aa217b SH |
2717 | { |
2718 | if (!c || !lxcapi_is_defined(c)) | |
2719 | return false; | |
2720 | if (has_snapshots(c)) { | |
2721 | ERROR("Container %s has snapshots; not removing", c->name); | |
2722 | return false; | |
2723 | } | |
2724 | ||
2725 | if (has_fs_snapshots(c)) { | |
2726 | ERROR("container %s has snapshots on its rootfs", c->name); | |
2727 | return false; | |
2728 | } | |
2729 | ||
17a367d8 | 2730 | return container_destroy(c, NULL); |
18aa217b SH |
2731 | } |
2732 | ||
858377e4 | 2733 | WRAP_API(bool, lxcapi_destroy) |
18aa217b | 2734 | |
858377e4 | 2735 | static bool do_lxcapi_destroy_with_snapshots(struct lxc_container *c) |
18aa217b SH |
2736 | { |
2737 | if (!c || !lxcapi_is_defined(c)) | |
2738 | return false; | |
2739 | if (!lxcapi_snapshot_destroy_all(c)) { | |
2740 | ERROR("Error deleting all snapshots"); | |
2741 | return false; | |
2742 | } | |
2743 | return lxcapi_destroy(c); | |
2744 | } | |
2745 | ||
858377e4 SH |
2746 | WRAP_API(bool, lxcapi_destroy_with_snapshots) |
2747 | ||
96532523 SH |
2748 | static bool set_config_item_locked(struct lxc_container *c, const char *key, const char *v) |
2749 | { | |
2750 | struct lxc_config_t *config; | |
2751 | ||
2752 | if (!c->lxc_conf) | |
2753 | c->lxc_conf = lxc_conf_init(); | |
4222a9f4 | 2754 | |
6b0d5538 | 2755 | if (!c->lxc_conf) |
96532523 | 2756 | return false; |
4222a9f4 | 2757 | |
96532523 SH |
2758 | config = lxc_getconfig(key); |
2759 | if (!config) | |
2760 | return false; | |
4222a9f4 | 2761 | |
c7e27aaf | 2762 | if (config->set(key, v, c->lxc_conf, NULL) != 0) |
f979ac15 | 2763 | return false; |
4222a9f4 CB |
2764 | |
2765 | if (lxc_config_value_empty(v)) { | |
2766 | do_clear_unexp_config_line(c->lxc_conf, key); | |
2767 | return true; | |
2768 | } | |
2769 | ||
6b0d5538 | 2770 | return do_append_unexp_config_line(c->lxc_conf, key, v); |
96532523 SH |
2771 | } |
2772 | ||
858377e4 | 2773 | static bool do_lxcapi_set_config_item(struct lxc_container *c, const char *key, const char *v) |
72d0e1cb | 2774 | { |
72d0e1cb | 2775 | bool b = false; |
72d0e1cb SG |
2776 | |
2777 | if (!c) | |
2778 | return false; | |
2779 | ||
5cee8c50 | 2780 | if (container_mem_lock(c)) |
72d0e1cb SG |
2781 | return false; |
2782 | ||
96532523 | 2783 | b = set_config_item_locked(c, key, v); |
72d0e1cb | 2784 | |
5cee8c50 | 2785 | container_mem_unlock(c); |
72d0e1cb SG |
2786 | return b; |
2787 | } | |
2788 | ||
858377e4 SH |
2789 | WRAP_API_2(bool, lxcapi_set_config_item, const char *, const char *) |
2790 | ||
72d0e1cb SG |
2791 | static char *lxcapi_config_file_name(struct lxc_container *c) |
2792 | { | |
2793 | if (!c || !c->configfile) | |
2794 | return NULL; | |
2795 | return strdup(c->configfile); | |
2796 | } | |
2797 | ||
2a59a681 SH |
2798 | static const char *lxcapi_get_config_path(struct lxc_container *c) |
2799 | { | |
2800 | if (!c || !c->config_path) | |
2801 | return NULL; | |
2802 | return (const char *)(c->config_path); | |
2803 | } | |
2804 | ||
afeecbba SH |
2805 | /* |
2806 | * not for export | |
2807 | * Just recalculate the c->configfile based on the | |
2808 | * c->config_path, which must be set. | |
2809 | * The lxc_container must be locked or not yet public. | |
2810 | */ | |
2811 | static bool set_config_filename(struct lxc_container *c) | |
2812 | { | |
2813 | char *newpath; | |
2814 | int len, ret; | |
2815 | ||
2816 | if (!c->config_path) | |
2817 | return false; | |
2818 | ||
2819 | /* $lxc_path + "/" + c->name + "/" + "config" + '\0' */ | |
2820 | len = strlen(c->config_path) + strlen(c->name) + strlen("config") + 3; | |
2821 | newpath = malloc(len); | |
2822 | if (!newpath) | |
2823 | return false; | |
2824 | ||
2825 | ret = snprintf(newpath, len, "%s/%s/config", c->config_path, c->name); | |
2826 | if (ret < 0 || ret >= len) { | |
2827 | fprintf(stderr, "Error printing out config file name\n"); | |
2828 | free(newpath); | |
2829 | return false; | |
2830 | } | |
2831 | ||
f10fad2f | 2832 | free(c->configfile); |
afeecbba SH |
2833 | c->configfile = newpath; |
2834 | ||
2835 | return true; | |
2836 | } | |
2837 | ||
858377e4 | 2838 | static bool do_lxcapi_set_config_path(struct lxc_container *c, const char *path) |
2a59a681 SH |
2839 | { |
2840 | char *p; | |
2841 | bool b = false; | |
afeecbba | 2842 | char *oldpath = NULL; |
2a59a681 SH |
2843 | |
2844 | if (!c) | |
2845 | return b; | |
2846 | ||
5cee8c50 | 2847 | if (container_mem_lock(c)) |
2a59a681 SH |
2848 | return b; |
2849 | ||
2850 | p = strdup(path); | |
afeecbba SH |
2851 | if (!p) { |
2852 | ERROR("Out of memory setting new lxc path"); | |
2a59a681 | 2853 | goto err; |
afeecbba SH |
2854 | } |
2855 | ||
2a59a681 SH |
2856 | b = true; |
2857 | if (c->config_path) | |
afeecbba | 2858 | oldpath = c->config_path; |
2a59a681 | 2859 | c->config_path = p; |
afeecbba SH |
2860 | |
2861 | /* Since we've changed the config path, we have to change the | |
2862 | * config file name too */ | |
2863 | if (!set_config_filename(c)) { | |
2864 | ERROR("Out of memory setting new config filename"); | |
2865 | b = false; | |
2866 | free(c->config_path); | |
2867 | c->config_path = oldpath; | |
2868 | oldpath = NULL; | |
2869 | } | |
2a59a681 | 2870 | err: |
f10fad2f | 2871 | free(oldpath); |
5cee8c50 | 2872 | container_mem_unlock(c); |
2a59a681 SH |
2873 | return b; |
2874 | } | |
2875 | ||
858377e4 | 2876 | WRAP_API_1(bool, lxcapi_set_config_path, const char *) |
2a59a681 | 2877 | |
858377e4 | 2878 | static bool do_lxcapi_set_cgroup_item(struct lxc_container *c, const char *subsys, const char *value) |
794dd120 SH |
2879 | { |
2880 | int ret; | |
794dd120 SH |
2881 | |
2882 | if (!c) | |
2883 | return false; | |
2884 | ||
3bc449ed | 2885 | if (is_stopped(c)) |
794dd120 SH |
2886 | return false; |
2887 | ||
3bc449ed SH |
2888 | if (container_disk_lock(c)) |
2889 | return false; | |
794dd120 | 2890 | |
33ad9f1a | 2891 | ret = lxc_cgroup_set(subsys, value, c->name, c->config_path); |
3bc449ed SH |
2892 | |
2893 | container_disk_unlock(c); | |
2894 | return ret == 0; | |
794dd120 SH |
2895 | } |
2896 | ||
858377e4 SH |
2897 | WRAP_API_2(bool, lxcapi_set_cgroup_item, const char *, const char *) |
2898 | ||
2899 | static int do_lxcapi_get_cgroup_item(struct lxc_container *c, const char *subsys, char *retv, int inlen) | |
794dd120 | 2900 | { |
3bc449ed | 2901 | int ret; |
794dd120 | 2902 | |
6502006a | 2903 | if (!c) |
794dd120 SH |
2904 | return -1; |
2905 | ||
3bc449ed | 2906 | if (is_stopped(c)) |
794dd120 SH |
2907 | return -1; |
2908 | ||
3bc449ed SH |
2909 | if (container_disk_lock(c)) |
2910 | return -1; | |
794dd120 | 2911 | |
33ad9f1a | 2912 | ret = lxc_cgroup_get(subsys, retv, inlen, c->name, c->config_path); |
794dd120 | 2913 | |
3bc449ed | 2914 | container_disk_unlock(c); |
794dd120 SH |
2915 | return ret; |
2916 | } | |
2917 | ||
858377e4 SH |
2918 | WRAP_API_3(int, lxcapi_get_cgroup_item, const char *, char *, int) |
2919 | ||
593e8478 | 2920 | const char *lxc_get_global_config_item(const char *key) |
83c98d82 | 2921 | { |
593e8478 | 2922 | return lxc_global_config_value(key); |
a8428dfa SH |
2923 | } |
2924 | ||
b6b918a1 SG |
2925 | const char *lxc_get_version(void) |
2926 | { | |
95ee490b | 2927 | return LXC_VERSION; |
b6b918a1 SG |
2928 | } |
2929 | ||
f0ca2726 | 2930 | static int copy_file(const char *old, const char *new) |
9be53773 SH |
2931 | { |
2932 | int in, out; | |
2933 | ssize_t len, ret; | |
2934 | char buf[8096]; | |
2935 | struct stat sbuf; | |
2936 | ||
2937 | if (file_exists(new)) { | |
2938 | ERROR("copy destination %s exists", new); | |
2939 | return -1; | |
2940 | } | |
2941 | ret = stat(old, &sbuf); | |
2942 | if (ret < 0) { | |
dfb31b25 | 2943 | INFO("Error stat'ing %s", old); |
9be53773 SH |
2944 | return -1; |
2945 | } | |
2946 | ||
2947 | in = open(old, O_RDONLY); | |
2948 | if (in < 0) { | |
dfb31b25 | 2949 | SYSERROR("Error opening original file %s", old); |
9be53773 SH |
2950 | return -1; |
2951 | } | |
2952 | out = open(new, O_CREAT | O_EXCL | O_WRONLY, 0644); | |
2953 | if (out < 0) { | |
dfb31b25 | 2954 | SYSERROR("Error opening new file %s", new); |
9be53773 SH |
2955 | close(in); |
2956 | return -1; | |
2957 | } | |
2958 | ||
2959 | while (1) { | |
2960 | len = read(in, buf, 8096); | |
2961 | if (len < 0) { | |
dfb31b25 | 2962 | SYSERROR("Error reading old file %s", old); |
9be53773 SH |
2963 | goto err; |
2964 | } | |
2965 | if (len == 0) | |
2966 | break; | |
2967 | ret = write(out, buf, len); | |
6849cb5b | 2968 | if (ret < len) { // should we retry? |
dfb31b25 | 2969 | SYSERROR("Error: write to new file %s was interrupted", new); |
9be53773 SH |
2970 | goto err; |
2971 | } | |
2972 | } | |
2973 | close(in); | |
2974 | close(out); | |
2975 | ||
2976 | // we set mode, but not owner/group | |
2977 | ret = chmod(new, sbuf.st_mode); | |
2978 | if (ret) { | |
dfb31b25 | 2979 | SYSERROR("Error setting mode on %s", new); |
9be53773 SH |
2980 | return -1; |
2981 | } | |
2982 | ||
2983 | return 0; | |
2984 | ||
2985 | err: | |
2986 | close(in); | |
2987 | close(out); | |
2988 | return -1; | |
2989 | } | |
2990 | ||
9be53773 SH |
2991 | static int copyhooks(struct lxc_container *oldc, struct lxc_container *c) |
2992 | { | |
619256b5 | 2993 | int i, len, ret; |
9be53773 | 2994 | struct lxc_list *it; |
619256b5 ÇO |
2995 | char *cpath; |
2996 | ||
2997 | len = strlen(oldc->config_path) + strlen(oldc->name) + 3; | |
2998 | cpath = alloca(len); | |
2999 | ret = snprintf(cpath, len, "%s/%s/", oldc->config_path, oldc->name); | |
3000 | if (ret < 0 || ret >= len) | |
3001 | return -1; | |
9be53773 SH |
3002 | |
3003 | for (i=0; i<NUM_LXC_HOOKS; i++) { | |
3004 | lxc_list_for_each(it, &c->lxc_conf->hooks[i]) { | |
3005 | char *hookname = it->elem; | |
c32981c3 | 3006 | char *fname = strrchr(hookname, '/'); |
9be53773 SH |
3007 | char tmppath[MAXPATHLEN]; |
3008 | if (!fname) // relative path - we don't support, but maybe we should | |
3009 | return 0; | |
619256b5 ÇO |
3010 | if (strncmp(hookname, cpath, len - 1) != 0) { |
3011 | // this hook is public - ignore | |
3012 | continue; | |
3013 | } | |
9be53773 SH |
3014 | // copy the script, and change the entry in confile |
3015 | ret = snprintf(tmppath, MAXPATHLEN, "%s/%s/%s", | |
3016 | c->config_path, c->name, fname+1); | |
3017 | if (ret < 0 || ret >= MAXPATHLEN) | |
3018 | return -1; | |
3019 | ret = copy_file(it->elem, tmppath); | |
3020 | if (ret < 0) | |
3021 | return -1; | |
3022 | free(it->elem); | |
3023 | it->elem = strdup(tmppath); | |
3024 | if (!it->elem) { | |
3025 | ERROR("out of memory copying hook path"); | |
3026 | return -1; | |
3027 | } | |
9be53773 SH |
3028 | } |
3029 | } | |
3030 | ||
67702c21 SH |
3031 | if (!clone_update_unexp_hooks(c->lxc_conf, oldc->config_path, |
3032 | c->config_path, oldc->name, c->name)) { | |
6b0d5538 SH |
3033 | ERROR("Error saving new hooks in clone"); |
3034 | return -1; | |
3035 | } | |
858377e4 | 3036 | do_lxcapi_save_config(c, NULL); |
9be53773 SH |
3037 | return 0; |
3038 | } | |
3039 | ||
9be53773 SH |
3040 | |
3041 | static int copy_fstab(struct lxc_container *oldc, struct lxc_container *c) | |
3042 | { | |
3043 | char newpath[MAXPATHLEN]; | |
3044 | char *oldpath = oldc->lxc_conf->fstab; | |
3045 | int ret; | |
3046 | ||
3047 | if (!oldpath) | |
3048 | return 0; | |
3049 | ||
47148e96 CB |
3050 | /* REMOVE IN LXC 3.0 |
3051 | legacy mount key | |
3052 | */ | |
6b0d5538 SH |
3053 | clear_unexp_config_line(c->lxc_conf, "lxc.mount", false); |
3054 | ||
47148e96 CB |
3055 | clear_unexp_config_line(c->lxc_conf, "lxc.mount.fstab", false); |
3056 | ||
c32981c3 | 3057 | char *p = strrchr(oldpath, '/'); |
9be53773 SH |
3058 | if (!p) |
3059 | return -1; | |
3060 | ret = snprintf(newpath, MAXPATHLEN, "%s/%s%s", | |
3061 | c->config_path, c->name, p); | |
3062 | if (ret < 0 || ret >= MAXPATHLEN) { | |
3063 | ERROR("error printing new path for %s", oldpath); | |
3064 | return -1; | |
3065 | } | |
3066 | if (file_exists(newpath)) { | |
3067 | ERROR("error: fstab file %s exists", newpath); | |
3068 | return -1; | |
3069 | } | |
3070 | ||
3071 | if (copy_file(oldpath, newpath) < 0) { | |
3072 | ERROR("error: copying %s to %s", oldpath, newpath); | |
3073 | return -1; | |
3074 | } | |
3075 | free(c->lxc_conf->fstab); | |
3076 | c->lxc_conf->fstab = strdup(newpath); | |
3077 | if (!c->lxc_conf->fstab) { | |
3078 | ERROR("error: allocating pathname"); | |
3079 | return -1; | |
3080 | } | |
47148e96 | 3081 | if (!do_append_unexp_config_line(c->lxc_conf, "lxc.mount.fstab", newpath)) { |
6b0d5538 SH |
3082 | ERROR("error saving new lxctab"); |
3083 | return -1; | |
3084 | } | |
9be53773 SH |
3085 | |
3086 | return 0; | |
3087 | } | |
3088 | ||
dfb31b25 SH |
3089 | static void copy_rdepends(struct lxc_container *c, struct lxc_container *c0) |
3090 | { | |
3091 | char path0[MAXPATHLEN], path1[MAXPATHLEN]; | |
3092 | int ret; | |
3093 | ||
3094 | ret = snprintf(path0, MAXPATHLEN, "%s/%s/lxc_rdepends", c0->config_path, | |
3095 | c0->name); | |
3096 | if (ret < 0 || ret >= MAXPATHLEN) { | |
3097 | WARN("Error copying reverse dependencies"); | |
3098 | return; | |
3099 | } | |
3100 | ret = snprintf(path1, MAXPATHLEN, "%s/%s/lxc_rdepends", c->config_path, | |
3101 | c->name); | |
3102 | if (ret < 0 || ret >= MAXPATHLEN) { | |
3103 | WARN("Error copying reverse dependencies"); | |
3104 | return; | |
3105 | } | |
3106 | if (copy_file(path0, path1) < 0) { | |
3107 | INFO("Error copying reverse dependencies"); | |
3108 | return; | |
3109 | } | |
3110 | } | |
3111 | ||
3112 | static bool add_rdepends(struct lxc_container *c, struct lxc_container *c0) | |
3113 | { | |
3114 | int ret; | |
3115 | char path[MAXPATHLEN]; | |
3116 | FILE *f; | |
3117 | bool bret; | |
3118 | ||
3119 | ret = snprintf(path, MAXPATHLEN, "%s/%s/lxc_rdepends", c->config_path, | |
3120 | c->name); | |
3121 | if (ret < 0 || ret >= MAXPATHLEN) | |
3122 | return false; | |
3123 | f = fopen(path, "a"); | |
3124 | if (!f) | |
3125 | return false; | |
3126 | bret = true; | |
3127 | // if anything goes wrong, just return an error | |
3128 | if (fprintf(f, "%s\n%s\n", c0->config_path, c0->name) < 0) | |
3129 | bret = false; | |
3130 | if (fclose(f) != 0) | |
3131 | bret = false; | |
3132 | return bret; | |
3133 | } | |
3134 | ||
15a90a10 SH |
3135 | /* |
3136 | * If the fs natively supports snapshot clones with no penalty, | |
3137 | * then default to those even if not requested. | |
3138 | * Currently we only do this for btrfs. | |
3139 | */ | |
3140 | bool should_default_to_snapshot(struct lxc_container *c0, | |
3141 | struct lxc_container *c1) | |
3142 | { | |
3143 | size_t l0 = strlen(c0->config_path) + strlen(c0->name) + 2; | |
3144 | size_t l1 = strlen(c1->config_path) + strlen(c1->name) + 2; | |
3145 | char *p0 = alloca(l0 + 1); | |
3146 | char *p1 = alloca(l1 + 1); | |
6e0fa6a0 | 3147 | char *rootfs = c0->lxc_conf->rootfs.path; |
15a90a10 SH |
3148 | |
3149 | snprintf(p0, l0, "%s/%s", c0->config_path, c0->name); | |
3150 | snprintf(p1, l1, "%s/%s", c1->config_path, c1->name); | |
9a09badc CB |
3151 | |
3152 | if (!is_btrfs_fs(p0) || !is_btrfs_fs(p1)) | |
3153 | return false; | |
3154 | ||
6e0fa6a0 CB |
3155 | if (is_btrfs_subvol(rootfs) <= 0) |
3156 | return false; | |
3157 | ||
15a90a10 SH |
3158 | return btrfs_same_fs(p0, p1) == 0; |
3159 | } | |
3160 | ||
9be53773 | 3161 | static int copy_storage(struct lxc_container *c0, struct lxc_container *c, |
763429b6 CB |
3162 | const char *newtype, int flags, const char *bdevdata, |
3163 | uint64_t newsize) | |
9be53773 | 3164 | { |
10bc1861 | 3165 | struct lxc_storage *bdev; |
07db51a2 | 3166 | bool need_rdep; |
9be53773 | 3167 | |
15a90a10 SH |
3168 | if (should_default_to_snapshot(c0, c)) |
3169 | flags |= LXC_CLONE_SNAPSHOT; | |
3170 | ||
10bc1861 CB |
3171 | bdev = storage_copy(c0, c->name, c->config_path, newtype, flags, |
3172 | bdevdata, newsize, &need_rdep); | |
9be53773 | 3173 | if (!bdev) { |
763429b6 | 3174 | ERROR("Error copying storage."); |
9be53773 SH |
3175 | return -1; |
3176 | } | |
763429b6 CB |
3177 | |
3178 | /* Set new rootfs. */ | |
9be53773 SH |
3179 | free(c->lxc_conf->rootfs.path); |
3180 | c->lxc_conf->rootfs.path = strdup(bdev->src); | |
10bc1861 | 3181 | storage_put(bdev); |
763429b6 | 3182 | |
dfb31b25 | 3183 | if (!c->lxc_conf->rootfs.path) { |
763429b6 CB |
3184 | ERROR("Out of memory while setting storage path."); |
3185 | return -1; | |
3186 | } | |
763429b6 | 3187 | |
7a96a068 CB |
3188 | /* REMOVE IN LXC 3.0 |
3189 | * legacy rootfs key | |
3190 | */ | |
6b0d5538 | 3191 | clear_unexp_config_line(c->lxc_conf, "lxc.rootfs", false); |
7a96a068 CB |
3192 | |
3193 | /* Append a new lxc.rootfs.path entry to the unexpanded config. */ | |
3194 | clear_unexp_config_line(c->lxc_conf, "lxc.rootfs.path", false); | |
3195 | if (!do_append_unexp_config_line(c->lxc_conf, "lxc.rootfs.path", | |
763429b6 CB |
3196 | c->lxc_conf->rootfs.path)) { |
3197 | ERROR("Error saving new rootfs to cloned config."); | |
d0218321 SH |
3198 | return -1; |
3199 | } | |
763429b6 | 3200 | |
7a96a068 CB |
3201 | /* REMOVE IN LXC 3.0 |
3202 | * legacy rootfs.backend key | |
3203 | */ | |
8869eb5f | 3204 | clear_unexp_config_line(c->lxc_conf, "lxc.rootfs.backend", false); |
763429b6 | 3205 | |
eee59f94 SH |
3206 | if (flags & LXC_CLONE_SNAPSHOT) |
3207 | copy_rdepends(c, c0); | |
dfb31b25 SH |
3208 | if (need_rdep) { |
3209 | if (!add_rdepends(c, c0)) | |
3210 | WARN("Error adding reverse dependency from %s to %s", | |
763429b6 | 3211 | c->name, c0->name); |
dfb31b25 SH |
3212 | } |
3213 | ||
3214 | mod_all_rdeps(c, true); | |
3215 | ||
9be53773 SH |
3216 | return 0; |
3217 | } | |
3218 | ||
1354955b SH |
3219 | struct clone_update_data { |
3220 | struct lxc_container *c0; | |
3221 | struct lxc_container *c1; | |
3222 | int flags; | |
3223 | char **hookargs; | |
3224 | }; | |
3225 | ||
3226 | static int clone_update_rootfs(struct clone_update_data *data) | |
9be53773 | 3227 | { |
1354955b SH |
3228 | struct lxc_container *c0 = data->c0; |
3229 | struct lxc_container *c = data->c1; | |
3230 | int flags = data->flags; | |
3231 | char **hookargs = data->hookargs; | |
9be53773 SH |
3232 | int ret = -1; |
3233 | char path[MAXPATHLEN]; | |
10bc1861 | 3234 | struct lxc_storage *bdev; |
9be53773 | 3235 | FILE *fout; |
148e91f5 | 3236 | struct lxc_conf *conf = c->lxc_conf; |
9be53773 SH |
3237 | |
3238 | /* update hostname in rootfs */ | |
3239 | /* we're going to mount, so run in a clean namespace to simplify cleanup */ | |
3240 | ||
1354955b SH |
3241 | if (setgid(0) < 0) { |
3242 | ERROR("Failed to setgid to 0"); | |
3243 | return -1; | |
3244 | } | |
3245 | if (setuid(0) < 0) { | |
3246 | ERROR("Failed to setuid to 0"); | |
9be53773 | 3247 | return -1; |
1354955b | 3248 | } |
c476bdce SH |
3249 | if (setgroups(0, NULL) < 0) |
3250 | WARN("Failed to clear groups"); | |
9be53773 | 3251 | |
1354955b SH |
3252 | if (unshare(CLONE_NEWNS) < 0) |
3253 | return -1; | |
10bc1861 | 3254 | bdev = storage_init(c->lxc_conf, c->lxc_conf->rootfs.path, c->lxc_conf->rootfs.mount, NULL); |
9be53773 | 3255 | if (!bdev) |
1354955b | 3256 | return -1; |
cf3ef16d SH |
3257 | if (strcmp(bdev->type, "dir") != 0) { |
3258 | if (unshare(CLONE_NEWNS) < 0) { | |
3259 | ERROR("error unsharing mounts"); | |
10bc1861 | 3260 | storage_put(bdev); |
1354955b | 3261 | return -1; |
cf3ef16d | 3262 | } |
2c6f3fc9 SH |
3263 | if (detect_shared_rootfs()) { |
3264 | if (mount(NULL, "/", NULL, MS_SLAVE|MS_REC, NULL)) { | |
3265 | SYSERROR("Failed to make / rslave"); | |
3266 | ERROR("Continuing..."); | |
3267 | } | |
3268 | } | |
e7de366c | 3269 | if (bdev->ops->mount(bdev) < 0) { |
10bc1861 | 3270 | storage_put(bdev); |
1354955b | 3271 | return -1; |
e7de366c | 3272 | } |
cf3ef16d | 3273 | } else { // TODO come up with a better way |
f10fad2f | 3274 | free(bdev->dest); |
cf3ef16d SH |
3275 | bdev->dest = strdup(bdev->src); |
3276 | } | |
148e91f5 SH |
3277 | |
3278 | if (!lxc_list_empty(&conf->hooks[LXCHOOK_CLONE])) { | |
3279 | /* Start of environment variable setup for hooks */ | |
ab7efcf5 | 3280 | if (c0->name && setenv("LXC_SRC_NAME", c0->name, 1)) { |
1143ed39 DE |
3281 | SYSERROR("failed to set environment variable for source container name"); |
3282 | } | |
ab7efcf5 | 3283 | if (c->name && setenv("LXC_NAME", c->name, 1)) { |
148e91f5 SH |
3284 | SYSERROR("failed to set environment variable for container name"); |
3285 | } | |
ab7efcf5 | 3286 | if (conf->rcfile && setenv("LXC_CONFIG_FILE", conf->rcfile, 1)) { |
148e91f5 SH |
3287 | SYSERROR("failed to set environment variable for config path"); |
3288 | } | |
ab7efcf5 | 3289 | if (bdev->dest && setenv("LXC_ROOTFS_MOUNT", bdev->dest, 1)) { |
148e91f5 SH |
3290 | SYSERROR("failed to set environment variable for rootfs mount"); |
3291 | } | |
ab7efcf5 | 3292 | if (conf->rootfs.path && setenv("LXC_ROOTFS_PATH", conf->rootfs.path, 1)) { |
148e91f5 SH |
3293 | SYSERROR("failed to set environment variable for rootfs mount"); |
3294 | } | |
3295 | ||
283678ed | 3296 | if (run_lxc_hooks(c->name, "clone", conf, c->get_config_path(c), hookargs)) { |
148e91f5 | 3297 | ERROR("Error executing clone hook for %s", c->name); |
10bc1861 | 3298 | storage_put(bdev); |
1354955b | 3299 | return -1; |
148e91f5 SH |
3300 | } |
3301 | } | |
3302 | ||
3303 | if (!(flags & LXC_CLONE_KEEPNAME)) { | |
3304 | ret = snprintf(path, MAXPATHLEN, "%s/etc/hostname", bdev->dest); | |
10bc1861 | 3305 | storage_put(bdev); |
e7de366c | 3306 | |
148e91f5 | 3307 | if (ret < 0 || ret >= MAXPATHLEN) |
1354955b | 3308 | return -1; |
8058be39 | 3309 | if (!file_exists(path)) |
1354955b | 3310 | return 0; |
148e91f5 | 3311 | if (!(fout = fopen(path, "w"))) { |
959aee9c | 3312 | SYSERROR("unable to open %s: ignoring", path); |
1354955b | 3313 | return 0; |
148e91f5 | 3314 | } |
a684f0b7 ÇO |
3315 | if (fprintf(fout, "%s", c->name) < 0) { |
3316 | fclose(fout); | |
1354955b | 3317 | return -1; |
6849cb5b | 3318 | } |
148e91f5 | 3319 | if (fclose(fout) < 0) |
1354955b | 3320 | return -1; |
10bc1861 CB |
3321 | } else { |
3322 | storage_put(bdev); | |
9be53773 | 3323 | } |
e7de366c | 3324 | |
1354955b SH |
3325 | return 0; |
3326 | } | |
3327 | ||
3328 | static int clone_update_rootfs_wrapper(void *data) | |
3329 | { | |
3330 | struct clone_update_data *arg = (struct clone_update_data *) data; | |
3331 | return clone_update_rootfs(arg); | |
9be53773 SH |
3332 | } |
3333 | ||
3334 | /* | |
3335 | * We want to support: | |
3336 | sudo lxc-clone -o o1 -n n1 -s -L|-fssize fssize -v|--vgname vgname \ | |
3337 | -p|--lvprefix lvprefix -t|--fstype fstype -B backingstore | |
3338 | ||
ba115175 CB |
3339 | -s [ implies overlay] |
3340 | -s -B overlay | |
9be53773 SH |
3341 | -s -B aufs |
3342 | ||
3343 | only rootfs gets converted (copied/snapshotted) on clone. | |
3344 | */ | |
3345 | ||
d5752559 | 3346 | static int create_file_dirname(char *path, struct lxc_conf *conf) |
9be53773 | 3347 | { |
c32981c3 | 3348 | char *p = strrchr(path, '/'); |
d5752559 | 3349 | int ret = -1; |
9be53773 SH |
3350 | |
3351 | if (!p) | |
3352 | return -1; | |
3353 | *p = '\0'; | |
d028235d | 3354 | ret = do_create_container_dir(path, conf); |
9be53773 SH |
3355 | *p = '/'; |
3356 | return ret; | |
3357 | } | |
3358 | ||
858377e4 | 3359 | static struct lxc_container *do_lxcapi_clone(struct lxc_container *c, const char *newname, |
9be53773 | 3360 | const char *lxcpath, int flags, |
d659597e | 3361 | const char *bdevtype, const char *bdevdata, uint64_t newsize, |
148e91f5 | 3362 | char **hookargs) |
9be53773 | 3363 | { |
9be53773 | 3364 | char newpath[MAXPATHLEN]; |
17a367d8 | 3365 | int ret; |
1354955b | 3366 | struct clone_update_data data; |
3b392519 | 3367 | size_t saved_unexp_len; |
9be53773 | 3368 | FILE *fout; |
1354955b | 3369 | pid_t pid; |
17a367d8 CB |
3370 | int storage_copied = 0; |
3371 | char *origroot = NULL, *saved_unexp_conf = NULL; | |
3372 | struct lxc_container *c2 = NULL; | |
9be53773 | 3373 | |
858377e4 | 3374 | if (!c || !do_lxcapi_is_defined(c)) |
9be53773 SH |
3375 | return NULL; |
3376 | ||
5cee8c50 | 3377 | if (container_mem_lock(c)) |
9be53773 SH |
3378 | return NULL; |
3379 | ||
39dc698c | 3380 | if (!is_stopped(c)) { |
9be53773 SH |
3381 | ERROR("error: Original container (%s) is running", c->name); |
3382 | goto out; | |
3383 | } | |
3384 | ||
3385 | // Make sure the container doesn't yet exist. | |
05d53f4c SH |
3386 | if (!newname) |
3387 | newname = c->name; | |
3388 | if (!lxcpath) | |
858377e4 | 3389 | lxcpath = do_lxcapi_get_config_path(c); |
05d53f4c | 3390 | ret = snprintf(newpath, MAXPATHLEN, "%s/%s/config", lxcpath, newname); |
6849cb5b | 3391 | if (ret < 0 || ret >= MAXPATHLEN) { |
9be53773 SH |
3392 | SYSERROR("clone: failed making config pathname"); |
3393 | goto out; | |
3394 | } | |
17a367d8 | 3395 | |
9be53773 SH |
3396 | if (file_exists(newpath)) { |
3397 | ERROR("error: clone: %s exists", newpath); | |
3398 | goto out; | |
3399 | } | |
3400 | ||
d5752559 | 3401 | ret = create_file_dirname(newpath, c->lxc_conf); |
96532523 | 3402 | if (ret < 0 && errno != EEXIST) { |
9be53773 SH |
3403 | ERROR("Error creating container dir for %s", newpath); |
3404 | goto out; | |
3405 | } | |
3406 | ||
3407 | // copy the configuration, tweak it as needed, | |
8d2efe40 SH |
3408 | if (c->lxc_conf->rootfs.path) { |
3409 | origroot = c->lxc_conf->rootfs.path; | |
3410 | c->lxc_conf->rootfs.path = NULL; | |
3411 | } | |
9be53773 SH |
3412 | fout = fopen(newpath, "w"); |
3413 | if (!fout) { | |
3414 | SYSERROR("open %s", newpath); | |
3415 | goto out; | |
3416 | } | |
5eea90e8 SH |
3417 | |
3418 | saved_unexp_conf = c->lxc_conf->unexpanded_config; | |
3b392519 | 3419 | saved_unexp_len = c->lxc_conf->unexpanded_len; |
5eea90e8 SH |
3420 | c->lxc_conf->unexpanded_config = strdup(saved_unexp_conf); |
3421 | if (!c->lxc_conf->unexpanded_config) { | |
3422 | ERROR("Out of memory"); | |
7d72b959 | 3423 | fclose(fout); |
5eea90e8 SH |
3424 | goto out; |
3425 | } | |
7a96a068 CB |
3426 | |
3427 | /* REMOVE IN LXC 3.0 | |
3428 | * legacy rootfs key | |
3429 | */ | |
5eea90e8 | 3430 | clear_unexp_config_line(c->lxc_conf, "lxc.rootfs", false); |
7a96a068 CB |
3431 | |
3432 | clear_unexp_config_line(c->lxc_conf, "lxc.rootfs.path", false); | |
6b0d5538 | 3433 | write_config(fout, c->lxc_conf); |
9be53773 | 3434 | fclose(fout); |
8d2efe40 | 3435 | c->lxc_conf->rootfs.path = origroot; |
5eea90e8 SH |
3436 | free(c->lxc_conf->unexpanded_config); |
3437 | c->lxc_conf->unexpanded_config = saved_unexp_conf; | |
3438 | saved_unexp_conf = NULL; | |
3b392519 | 3439 | c->lxc_conf->unexpanded_len = saved_unexp_len; |
9be53773 | 3440 | |
90b366fc CB |
3441 | ret = snprintf(newpath, MAXPATHLEN, "%s/%s/rootfs", lxcpath, newname); |
3442 | if (ret < 0 || ret >= MAXPATHLEN) { | |
3443 | SYSERROR("clone: failed making rootfs pathname"); | |
3444 | goto out; | |
3445 | } | |
17a367d8 CB |
3446 | |
3447 | ret = mkdir(newpath, 0755); | |
3448 | if (ret < 0) { | |
3449 | /* For an overlay container the rootfs is considered immutable | |
3450 | * and will not have been removed when restoring from a | |
3451 | * snapshot. | |
3452 | */ | |
3453 | if (errno != ENOENT && | |
3454 | !(flags & LXC_STORAGE_INTERNAL_OVERLAY_RESTORE)) { | |
3455 | SYSERROR("Failed to create directory \"%s\"", newpath); | |
3456 | goto out; | |
3457 | } | |
9be53773 SH |
3458 | } |
3459 | ||
1354955b SH |
3460 | if (am_unpriv()) { |
3461 | if (chown_mapped_root(newpath, c->lxc_conf) < 0) { | |
959aee9c | 3462 | ERROR("Error chowning %s to container root", newpath); |
1354955b SH |
3463 | goto out; |
3464 | } | |
3465 | } | |
3466 | ||
05d53f4c | 3467 | c2 = lxc_container_new(newname, lxcpath); |
375c2258 | 3468 | if (!c2) { |
05d53f4c SH |
3469 | ERROR("clone: failed to create new container (%s %s)", newname, |
3470 | lxcpath); | |
9be53773 SH |
3471 | goto out; |
3472 | } | |
8d2efe40 SH |
3473 | |
3474 | // copy/snapshot rootfs's | |
3475 | ret = copy_storage(c, c2, bdevtype, flags, bdevdata, newsize); | |
3476 | if (ret < 0) | |
3477 | goto out; | |
9be53773 | 3478 | |
6b0d5538 | 3479 | |
96532523 | 3480 | // update utsname |
3d7ad474 CB |
3481 | if (!(flags & LXC_CLONE_KEEPNAME)) { |
3482 | clear_unexp_config_line(c2->lxc_conf, "lxc.utsname", false); | |
b67771bc | 3483 | clear_unexp_config_line(c2->lxc_conf, "lxc.uts.name", false); |
3d7ad474 | 3484 | |
b67771bc | 3485 | if (!set_config_item_locked(c2, "lxc.uts.name", newname)) { |
3d7ad474 CB |
3486 | ERROR("Error setting new hostname"); |
3487 | goto out; | |
3488 | } | |
96532523 SH |
3489 | } |
3490 | ||
619256b5 ÇO |
3491 | // copy hooks |
3492 | ret = copyhooks(c, c2); | |
3493 | if (ret < 0) { | |
3494 | ERROR("error copying hooks"); | |
3495 | goto out; | |
9be53773 SH |
3496 | } |
3497 | ||
3498 | if (copy_fstab(c, c2) < 0) { | |
3499 | ERROR("error copying fstab"); | |
9be53773 SH |
3500 | goto out; |
3501 | } | |
3502 | ||
3503 | // update macaddrs | |
6b0d5538 | 3504 | if (!(flags & LXC_CLONE_KEEPMACADDR)) { |
67702c21 SH |
3505 | if (!network_new_hwaddrs(c2->lxc_conf)) { |
3506 | ERROR("Error updating mac addresses"); | |
6b0d5538 SH |
3507 | goto out; |
3508 | } | |
3509 | } | |
9be53773 | 3510 | |
030ce9a9 | 3511 | // update absolute paths for overlay mount directories |
83e79752 | 3512 | if (ovl_update_abs_paths(c2->lxc_conf, c->config_path, c->name, lxcpath, newname) < 0) |
030ce9a9 CB |
3513 | goto out; |
3514 | ||
176d9acb SH |
3515 | // We've now successfully created c2's storage, so clear it out if we |
3516 | // fail after this | |
3517 | storage_copied = 1; | |
3518 | ||
375c2258 | 3519 | if (!c2->save_config(c2, NULL)) |
9be53773 | 3520 | goto out; |
9be53773 | 3521 | |
1354955b SH |
3522 | if ((pid = fork()) < 0) { |
3523 | SYSERROR("fork"); | |
9be53773 | 3524 | goto out; |
1354955b SH |
3525 | } |
3526 | if (pid > 0) { | |
3527 | ret = wait_for_pid(pid); | |
3528 | if (ret) | |
3529 | goto out; | |
3530 | container_mem_unlock(c); | |
3531 | return c2; | |
3532 | } | |
3533 | data.c0 = c; | |
3534 | data.c1 = c2; | |
3535 | data.flags = flags; | |
3536 | data.hookargs = hookargs; | |
3537 | if (am_unpriv()) | |
3538 | ret = userns_exec_1(c->lxc_conf, clone_update_rootfs_wrapper, | |
c9b7c33e | 3539 | &data, "clone_update_rootfs_wrapper"); |
1354955b SH |
3540 | else |
3541 | ret = clone_update_rootfs(&data); | |
3542 | if (ret < 0) | |
3543 | exit(1); | |
9be53773 | 3544 | |
5cee8c50 | 3545 | container_mem_unlock(c); |
1354955b | 3546 | exit(0); |
9be53773 SH |
3547 | |
3548 | out: | |
5cee8c50 | 3549 | container_mem_unlock(c); |
375c2258 | 3550 | if (c2) { |
176d9acb SH |
3551 | if (!storage_copied) |
3552 | c2->lxc_conf->rootfs.path = NULL; | |
375c2258 | 3553 | c2->destroy(c2); |
9be53773 | 3554 | lxc_container_put(c2); |
375c2258 | 3555 | } |
9be53773 SH |
3556 | |
3557 | return NULL; | |
3558 | } | |
3559 | ||
858377e4 SH |
3560 | static struct lxc_container *lxcapi_clone(struct lxc_container *c, const char *newname, |
3561 | const char *lxcpath, int flags, | |
3562 | const char *bdevtype, const char *bdevdata, uint64_t newsize, | |
3563 | char **hookargs) | |
3564 | { | |
3565 | struct lxc_container * ret; | |
3566 | current_config = c ? c->lxc_conf : NULL; | |
3567 | ret = do_lxcapi_clone(c, newname, lxcpath, flags, bdevtype, bdevdata, newsize, hookargs); | |
3568 | current_config = NULL; | |
3569 | return ret; | |
3570 | } | |
3571 | ||
3572 | static bool do_lxcapi_rename(struct lxc_container *c, const char *newname) | |
06e5650e | 3573 | { |
10bc1861 | 3574 | struct lxc_storage *bdev; |
06e5650e | 3575 | struct lxc_container *newc; |
06e5650e | 3576 | |
d693cf93 | 3577 | if (!c || !c->name || !c->config_path || !c->lxc_conf) |
06e5650e ÇO |
3578 | return false; |
3579 | ||
18aa217b SH |
3580 | if (has_fs_snapshots(c) || has_snapshots(c)) { |
3581 | ERROR("Renaming a container with snapshots is not supported"); | |
3582 | return false; | |
3583 | } | |
10bc1861 | 3584 | bdev = storage_init(c->lxc_conf, c->lxc_conf->rootfs.path, c->lxc_conf->rootfs.mount, NULL); |
06e5650e ÇO |
3585 | if (!bdev) { |
3586 | ERROR("Failed to find original backing store type"); | |
3587 | return false; | |
3588 | } | |
3589 | ||
619256b5 | 3590 | newc = lxcapi_clone(c, newname, c->config_path, LXC_CLONE_KEEPMACADDR, NULL, bdev->type, 0, NULL); |
10bc1861 | 3591 | storage_put(bdev); |
06e5650e ÇO |
3592 | if (!newc) { |
3593 | lxc_container_put(newc); | |
3594 | return false; | |
3595 | } | |
3596 | ||
3597 | if (newc && lxcapi_is_defined(newc)) | |
3598 | lxc_container_put(newc); | |
3599 | ||
17a367d8 | 3600 | if (!container_destroy(c, NULL)) { |
06e5650e ÇO |
3601 | ERROR("Could not destroy existing container %s", c->name); |
3602 | return false; | |
3603 | } | |
3604 | return true; | |
3605 | } | |
3606 | ||
858377e4 SH |
3607 | WRAP_API_1(bool, lxcapi_rename, const char *) |
3608 | ||
a0e93eeb CS |
3609 | 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) |
3610 | { | |
858377e4 SH |
3611 | int ret; |
3612 | ||
a0e93eeb CS |
3613 | if (!c) |
3614 | return -1; | |
3615 | ||
858377e4 SH |
3616 | current_config = c->lxc_conf; |
3617 | ||
3618 | ret = lxc_attach(c->name, c->config_path, exec_function, exec_payload, options, attached_process); | |
3619 | current_config = NULL; | |
3620 | return ret; | |
a0e93eeb CS |
3621 | } |
3622 | ||
858377e4 | 3623 | static int do_lxcapi_attach_run_wait(struct lxc_container *c, lxc_attach_options_t *options, const char *program, const char * const argv[]) |
a0e93eeb CS |
3624 | { |
3625 | lxc_attach_command_t command; | |
3626 | pid_t pid; | |
3627 | int r; | |
3628 | ||
3629 | if (!c) | |
3630 | return -1; | |
3631 | ||
3632 | command.program = (char*)program; | |
3633 | command.argv = (char**)argv; | |
3634 | r = lxc_attach(c->name, c->config_path, lxc_attach_run_command, &command, options, &pid); | |
3635 | if (r < 0) { | |
3636 | ERROR("ups"); | |
3637 | return r; | |
3638 | } | |
3639 | return lxc_wait_for_pid_status(pid); | |
3640 | } | |
3641 | ||
858377e4 SH |
3642 | static int lxcapi_attach_run_wait(struct lxc_container *c, lxc_attach_options_t *options, const char *program, const char * const argv[]) |
3643 | { | |
3644 | int ret; | |
3645 | current_config = c ? c->lxc_conf : NULL; | |
3646 | ret = do_lxcapi_attach_run_wait(c, options, program, argv); | |
3647 | current_config = NULL; | |
3648 | return ret; | |
3649 | } | |
3650 | ||
74a3920a | 3651 | static int get_next_index(const char *lxcpath, char *cname) |
f5dd1d53 SH |
3652 | { |
3653 | char *fname; | |
3654 | struct stat sb; | |
3655 | int i = 0, ret; | |
3656 | ||
3657 | fname = alloca(strlen(lxcpath) + 20); | |
3658 | while (1) { | |
3659 | sprintf(fname, "%s/snap%d", lxcpath, i); | |
3660 | ret = stat(fname, &sb); | |
3661 | if (ret != 0) | |
3662 | return i; | |
3663 | i++; | |
3664 | } | |
3665 | } | |
3666 | ||
18aa217b SH |
3667 | static bool get_snappath_dir(struct lxc_container *c, char *snappath) |
3668 | { | |
3669 | int ret; | |
3670 | /* | |
3671 | * If the old style snapshot path exists, use it | |
3672 | * /var/lib/lxc -> /var/lib/lxcsnaps | |
3673 | */ | |
3674 | ret = snprintf(snappath, MAXPATHLEN, "%ssnaps", c->config_path); | |
3675 | if (ret < 0 || ret >= MAXPATHLEN) | |
3676 | return false; | |
3677 | if (dir_exists(snappath)) { | |
3678 | ret = snprintf(snappath, MAXPATHLEN, "%ssnaps/%s", c->config_path, c->name); | |
3679 | if (ret < 0 || ret >= MAXPATHLEN) | |
3680 | return false; | |
3681 | return true; | |
3682 | } | |
3683 | ||
3684 | /* | |
3685 | * Use the new style path | |
3686 | * /var/lib/lxc -> /var/lib/lxc + c->name + /snaps + \0 | |
3687 | */ | |
3688 | ret = snprintf(snappath, MAXPATHLEN, "%s/%s/snaps", c->config_path, c->name); | |
3689 | if (ret < 0 || ret >= MAXPATHLEN) | |
3690 | return false; | |
3691 | return true; | |
3692 | } | |
3693 | ||
858377e4 | 3694 | static int do_lxcapi_snapshot(struct lxc_container *c, const char *commentfile) |
f5dd1d53 SH |
3695 | { |
3696 | int i, flags, ret; | |
3697 | struct lxc_container *c2; | |
3698 | char snappath[MAXPATHLEN], newname[20]; | |
3699 | ||
840f05df SH |
3700 | if (!c || !lxcapi_is_defined(c)) |
3701 | return -1; | |
3702 | ||
10bc1861 | 3703 | if (!storage_can_backup(c->lxc_conf)) { |
cdd01be2 SH |
3704 | ERROR("%s's backing store cannot be backed up.", c->name); |
3705 | ERROR("Your container must use another backing store type."); | |
3706 | return -1; | |
3707 | } | |
3708 | ||
18aa217b | 3709 | if (!get_snappath_dir(c, snappath)) |
f5dd1d53 | 3710 | return -1; |
18aa217b | 3711 | |
f5dd1d53 SH |
3712 | i = get_next_index(snappath, c->name); |
3713 | ||
3714 | if (mkdir_p(snappath, 0755) < 0) { | |
3715 | ERROR("Failed to create snapshot directory %s", snappath); | |
3716 | return -1; | |
3717 | } | |
3718 | ||
3719 | ret = snprintf(newname, 20, "snap%d", i); | |
3720 | if (ret < 0 || ret >= 20) | |
3721 | return -1; | |
3722 | ||
0a83cbbb SH |
3723 | /* |
3724 | * We pass LXC_CLONE_SNAPSHOT to make sure that a rdepends file entry is | |
3725 | * created in the original container | |
3726 | */ | |
3727 | flags = LXC_CLONE_SNAPSHOT | LXC_CLONE_KEEPMACADDR | LXC_CLONE_KEEPNAME | | |
3728 | LXC_CLONE_KEEPBDEVTYPE | LXC_CLONE_MAYBE_SNAPSHOT; | |
10bc1861 | 3729 | if (storage_is_dir(c->lxc_conf, c->lxc_conf->rootfs.path)) { |
8c39f7a4 SH |
3730 | ERROR("Snapshot of directory-backed container requested."); |
3731 | ERROR("Making a copy-clone. If you do want snapshots, then"); | |
ba115175 | 3732 | ERROR("please create an aufs or overlay clone first, snapshot that"); |
8c39f7a4 SH |
3733 | ERROR("and keep the original container pristine."); |
3734 | flags &= ~LXC_CLONE_SNAPSHOT | LXC_CLONE_MAYBE_SNAPSHOT; | |
3735 | } | |
858377e4 | 3736 | c2 = do_lxcapi_clone(c, newname, snappath, flags, NULL, NULL, 0, NULL); |
f5dd1d53 | 3737 | if (!c2) { |
959aee9c | 3738 | ERROR("clone of %s:%s failed", c->config_path, c->name); |
f5dd1d53 SH |
3739 | return -1; |
3740 | } | |
3741 | ||
3742 | lxc_container_put(c2); | |
3743 | ||
3744 | // Now write down the creation time | |
3745 | time_t timer; | |
3746 | char buffer[25]; | |
3747 | struct tm* tm_info; | |
025ed0f3 | 3748 | FILE *f; |
f5dd1d53 SH |
3749 | |
3750 | time(&timer); | |
3751 | tm_info = localtime(&timer); | |
3752 | ||
3753 | strftime(buffer, 25, "%Y:%m:%d %H:%M:%S", tm_info); | |
3754 | ||
3755 | char *dfnam = alloca(strlen(snappath) + strlen(newname) + 5); | |
3756 | sprintf(dfnam, "%s/%s/ts", snappath, newname); | |
025ed0f3 | 3757 | f = fopen(dfnam, "w"); |
f5dd1d53 | 3758 | if (!f) { |
959aee9c | 3759 | ERROR("Failed to open %s", dfnam); |
f5dd1d53 SH |
3760 | return -1; |
3761 | } | |
3762 | if (fprintf(f, "%s", buffer) < 0) { | |
3763 | SYSERROR("Writing timestamp"); | |
3764 | fclose(f); | |
3765 | return -1; | |
3766 | } | |
025ed0f3 | 3767 | ret = fclose(f); |
025ed0f3 | 3768 | if (ret != 0) { |
f5dd1d53 SH |
3769 | SYSERROR("Writing timestamp"); |
3770 | return -1; | |
3771 | } | |
3772 | ||
3773 | if (commentfile) { | |
3774 | // $p / $name / comment \0 | |
3775 | int len = strlen(snappath) + strlen(newname) + 10; | |
3776 | char *path = alloca(len); | |
3777 | sprintf(path, "%s/%s/comment", snappath, newname); | |
3778 | return copy_file(commentfile, path) < 0 ? -1 : i; | |
3779 | } | |
3780 | ||
3781 | return i; | |
3782 | } | |
3783 | ||
858377e4 SH |
3784 | WRAP_API_1(int, lxcapi_snapshot, const char *) |
3785 | ||
f5dd1d53 SH |
3786 | static void lxcsnap_free(struct lxc_snapshot *s) |
3787 | { | |
f10fad2f ME |
3788 | free(s->name); |
3789 | free(s->comment_pathname); | |
3790 | free(s->timestamp); | |
3791 | free(s->lxcpath); | |
f5dd1d53 SH |
3792 | } |
3793 | ||
3794 | static char *get_snapcomment_path(char* snappath, char *name) | |
3795 | { | |
3796 | // $snappath/$name/comment | |
3797 | int ret, len = strlen(snappath) + strlen(name) + 10; | |
3798 | char *s = malloc(len); | |
3799 | ||
3800 | if (s) { | |
3801 | ret = snprintf(s, len, "%s/%s/comment", snappath, name); | |
3802 | if (ret < 0 || ret >= len) { | |
3803 | free(s); | |
3804 | s = NULL; | |
3805 | } | |
3806 | } | |
3807 | return s; | |
3808 | } | |
3809 | ||
3810 | static char *get_timestamp(char* snappath, char *name) | |
3811 | { | |
3812 | char path[MAXPATHLEN], *s = NULL; | |
3813 | int ret, len; | |
3814 | FILE *fin; | |
3815 | ||
3816 | ret = snprintf(path, MAXPATHLEN, "%s/%s/ts", snappath, name); | |
3817 | if (ret < 0 || ret >= MAXPATHLEN) | |
3818 | return NULL; | |
025ed0f3 | 3819 | fin = fopen(path, "r"); |
025ed0f3 | 3820 | if (!fin) |
f5dd1d53 SH |
3821 | return NULL; |
3822 | (void) fseek(fin, 0, SEEK_END); | |
3823 | len = ftell(fin); | |
3824 | (void) fseek(fin, 0, SEEK_SET); | |
3825 | if (len > 0) { | |
3826 | s = malloc(len+1); | |
3827 | if (s) { | |
3828 | s[len] = '\0'; | |
3829 | if (fread(s, 1, len, fin) != len) { | |
3830 | SYSERROR("reading timestamp"); | |
3831 | free(s); | |
3832 | s = NULL; | |
3833 | } | |
3834 | } | |
3835 | } | |
3836 | fclose(fin); | |
3837 | return s; | |
3838 | } | |
3839 | ||
858377e4 | 3840 | static int do_lxcapi_snapshot_list(struct lxc_container *c, struct lxc_snapshot **ret_snaps) |
f5dd1d53 SH |
3841 | { |
3842 | char snappath[MAXPATHLEN], path2[MAXPATHLEN]; | |
18aa217b | 3843 | int count = 0, ret; |
74f96976 | 3844 | struct dirent *direntp; |
f5dd1d53 SH |
3845 | struct lxc_snapshot *snaps =NULL, *nsnaps; |
3846 | DIR *dir; | |
3847 | ||
3848 | if (!c || !lxcapi_is_defined(c)) | |
3849 | return -1; | |
c868b261 | 3850 | |
18aa217b | 3851 | if (!get_snappath_dir(c, snappath)) { |
f5dd1d53 SH |
3852 | ERROR("path name too long"); |
3853 | return -1; | |
3854 | } | |
025ed0f3 | 3855 | dir = opendir(snappath); |
025ed0f3 | 3856 | if (!dir) { |
f5dd1d53 SH |
3857 | INFO("failed to open %s - assuming no snapshots", snappath); |
3858 | return 0; | |
3859 | } | |
3860 | ||
74f96976 | 3861 | while ((direntp = readdir(dir))) { |
f5dd1d53 SH |
3862 | if (!direntp) |
3863 | break; | |
3864 | ||
3865 | if (!strcmp(direntp->d_name, ".")) | |
3866 | continue; | |
3867 | ||
3868 | if (!strcmp(direntp->d_name, "..")) | |
3869 | continue; | |
3870 | ||
3871 | ret = snprintf(path2, MAXPATHLEN, "%s/%s/config", snappath, direntp->d_name); | |
3872 | if (ret < 0 || ret >= MAXPATHLEN) { | |
3873 | ERROR("pathname too long"); | |
3874 | goto out_free; | |
3875 | } | |
3876 | if (!file_exists(path2)) | |
3877 | continue; | |
3878 | nsnaps = realloc(snaps, (count + 1)*sizeof(*snaps)); | |
3879 | if (!nsnaps) { | |
3880 | SYSERROR("Out of memory"); | |
3881 | goto out_free; | |
3882 | } | |
3883 | snaps = nsnaps; | |
3884 | snaps[count].free = lxcsnap_free; | |
3885 | snaps[count].name = strdup(direntp->d_name); | |
3886 | if (!snaps[count].name) | |
3887 | goto out_free; | |
3888 | snaps[count].lxcpath = strdup(snappath); | |
3889 | if (!snaps[count].lxcpath) { | |
3890 | free(snaps[count].name); | |
3891 | goto out_free; | |
3892 | } | |
3893 | snaps[count].comment_pathname = get_snapcomment_path(snappath, direntp->d_name); | |
3894 | snaps[count].timestamp = get_timestamp(snappath, direntp->d_name); | |
3895 | count++; | |
3896 | } | |
3897 | ||
3898 | if (closedir(dir)) | |
3899 | WARN("failed to close directory"); | |
3900 | ||
3901 | *ret_snaps = snaps; | |
3902 | return count; | |
3903 | ||
3904 | out_free: | |
3905 | if (snaps) { | |
3906 | int i; | |
3907 | for (i=0; i<count; i++) | |
3908 | lxcsnap_free(&snaps[i]); | |
3909 | free(snaps); | |
3910 | } | |
9baa57bd SH |
3911 | if (closedir(dir)) |
3912 | WARN("failed to close directory"); | |
f5dd1d53 SH |
3913 | return -1; |
3914 | } | |
3915 | ||
858377e4 SH |
3916 | WRAP_API_1(int, lxcapi_snapshot_list, struct lxc_snapshot **) |
3917 | ||
3918 | static bool do_lxcapi_snapshot_restore(struct lxc_container *c, const char *snapname, const char *newname) | |
f5dd1d53 SH |
3919 | { |
3920 | char clonelxcpath[MAXPATHLEN]; | |
18aa217b | 3921 | int flags = 0; |
f5dd1d53 | 3922 | struct lxc_container *snap, *rest; |
10bc1861 | 3923 | struct lxc_storage *bdev; |
f5dd1d53 SH |
3924 | bool b = false; |
3925 | ||
3926 | if (!c || !c->name || !c->config_path) | |
3927 | return false; | |
3928 | ||
18aa217b SH |
3929 | if (has_fs_snapshots(c)) { |
3930 | ERROR("container rootfs has dependent snapshots"); | |
3931 | return false; | |
3932 | } | |
3933 | ||
17a367d8 CB |
3934 | bdev = storage_init(c->lxc_conf, c->lxc_conf->rootfs.path, |
3935 | c->lxc_conf->rootfs.mount, NULL); | |
f5dd1d53 SH |
3936 | if (!bdev) { |
3937 | ERROR("Failed to find original backing store type"); | |
3938 | return false; | |
3939 | } | |
3940 | ||
17a367d8 CB |
3941 | /* For an overlay container the rootfs is considered immutable |
3942 | * and cannot be removed when restoring from a snapshot. We pass this | |
3943 | * internal flag along to communicate this to various parts of the | |
3944 | * codebase. | |
3945 | */ | |
3946 | if (!strcmp(bdev->type, "overlay") || !strcmp(bdev->type, "overlayfs")) | |
3947 | bdev->flags |= LXC_STORAGE_INTERNAL_OVERLAY_RESTORE; | |
3948 | ||
f5dd1d53 SH |
3949 | if (!newname) |
3950 | newname = c->name; | |
7e36f87e | 3951 | |
18aa217b | 3952 | if (!get_snappath_dir(c, clonelxcpath)) { |
10bc1861 | 3953 | storage_put(bdev); |
f5dd1d53 SH |
3954 | return false; |
3955 | } | |
3956 | // how should we lock this? | |
3957 | ||
3958 | snap = lxc_container_new(snapname, clonelxcpath); | |
3959 | if (!snap || !lxcapi_is_defined(snap)) { | |
3960 | ERROR("Could not open snapshot %s", snapname); | |
17a367d8 CB |
3961 | if (snap) |
3962 | lxc_container_put(snap); | |
10bc1861 | 3963 | storage_put(bdev); |
f5dd1d53 SH |
3964 | return false; |
3965 | } | |
3966 | ||
17a367d8 CB |
3967 | if (!strcmp(c->name, newname)) { |
3968 | if (!container_destroy(c, bdev)) { | |
7e36f87e ÇO |
3969 | ERROR("Could not destroy existing container %s", newname); |
3970 | lxc_container_put(snap); | |
10bc1861 | 3971 | storage_put(bdev); |
7e36f87e ÇO |
3972 | return false; |
3973 | } | |
3974 | } | |
3975 | ||
de269ee8 SH |
3976 | if (strcmp(bdev->type, "dir") != 0 && strcmp(bdev->type, "loop") != 0) |
3977 | flags = LXC_CLONE_SNAPSHOT | LXC_CLONE_MAYBE_SNAPSHOT; | |
17a367d8 CB |
3978 | |
3979 | if (!strcmp(bdev->type, "overlay") || !strcmp(bdev->type, "overlayfs")) | |
3980 | flags |= LXC_STORAGE_INTERNAL_OVERLAY_RESTORE; | |
de269ee8 SH |
3981 | rest = lxcapi_clone(snap, newname, c->config_path, flags, |
3982 | bdev->type, NULL, 0, NULL); | |
10bc1861 | 3983 | storage_put(bdev); |
f5dd1d53 SH |
3984 | if (rest && lxcapi_is_defined(rest)) |
3985 | b = true; | |
3986 | if (rest) | |
3987 | lxc_container_put(rest); | |
17a367d8 | 3988 | |
f5dd1d53 SH |
3989 | lxc_container_put(snap); |
3990 | return b; | |
3991 | } | |
3992 | ||
858377e4 SH |
3993 | WRAP_API_2(bool, lxcapi_snapshot_restore, const char *, const char *) |
3994 | ||
18aa217b | 3995 | static bool do_snapshot_destroy(const char *snapname, const char *clonelxcpath) |
771d96b3 | 3996 | { |
771d96b3 | 3997 | struct lxc_container *snap = NULL; |
18aa217b | 3998 | bool bret = false; |
771d96b3 ÇO |
3999 | |
4000 | snap = lxc_container_new(snapname, clonelxcpath); | |
18aa217b | 4001 | if (!snap) { |
771d96b3 ÇO |
4002 | ERROR("Could not find snapshot %s", snapname); |
4003 | goto err; | |
4004 | } | |
4005 | ||
858377e4 | 4006 | if (!do_lxcapi_destroy(snap)) { |
771d96b3 ÇO |
4007 | ERROR("Could not destroy snapshot %s", snapname); |
4008 | goto err; | |
4009 | } | |
18aa217b | 4010 | bret = true; |
771d96b3 | 4011 | |
771d96b3 ÇO |
4012 | err: |
4013 | if (snap) | |
4014 | lxc_container_put(snap); | |
18aa217b SH |
4015 | return bret; |
4016 | } | |
4017 | ||
4018 | static bool remove_all_snapshots(const char *path) | |
4019 | { | |
4020 | DIR *dir; | |
74f96976 | 4021 | struct dirent *direntp; |
18aa217b SH |
4022 | bool bret = true; |
4023 | ||
4024 | dir = opendir(path); | |
4025 | if (!dir) { | |
4026 | SYSERROR("opendir on snapshot path %s", path); | |
4027 | return false; | |
4028 | } | |
74f96976 | 4029 | while ((direntp = readdir(dir))) { |
18aa217b SH |
4030 | if (!direntp) |
4031 | break; | |
4032 | if (!strcmp(direntp->d_name, ".")) | |
4033 | continue; | |
4034 | if (!strcmp(direntp->d_name, "..")) | |
4035 | continue; | |
4036 | if (!do_snapshot_destroy(direntp->d_name, path)) { | |
4037 | bret = false; | |
4038 | continue; | |
4039 | } | |
4040 | } | |
4041 | ||
4042 | closedir(dir); | |
4043 | ||
4044 | if (rmdir(path)) | |
4045 | SYSERROR("Error removing directory %s", path); | |
4046 | ||
4047 | return bret; | |
4048 | } | |
4049 | ||
858377e4 | 4050 | static bool do_lxcapi_snapshot_destroy(struct lxc_container *c, const char *snapname) |
18aa217b SH |
4051 | { |
4052 | char clonelxcpath[MAXPATHLEN]; | |
4053 | ||
4054 | if (!c || !c->name || !c->config_path || !snapname) | |
4055 | return false; | |
4056 | ||
4057 | if (!get_snappath_dir(c, clonelxcpath)) | |
4058 | return false; | |
4059 | ||
4060 | return do_snapshot_destroy(snapname, clonelxcpath); | |
4061 | } | |
4062 | ||
858377e4 SH |
4063 | WRAP_API_1(bool, lxcapi_snapshot_destroy, const char *) |
4064 | ||
4065 | static bool do_lxcapi_snapshot_destroy_all(struct lxc_container *c) | |
18aa217b SH |
4066 | { |
4067 | char clonelxcpath[MAXPATHLEN]; | |
4068 | ||
4069 | if (!c || !c->name || !c->config_path) | |
4070 | return false; | |
4071 | ||
4072 | if (!get_snappath_dir(c, clonelxcpath)) | |
4073 | return false; | |
4074 | ||
4075 | return remove_all_snapshots(clonelxcpath); | |
771d96b3 ÇO |
4076 | } |
4077 | ||
858377e4 SH |
4078 | WRAP_API(bool, lxcapi_snapshot_destroy_all) |
4079 | ||
4080 | static bool do_lxcapi_may_control(struct lxc_container *c) | |
b494d2dd SH |
4081 | { |
4082 | return lxc_try_cmd(c->name, c->config_path) == 0; | |
4083 | } | |
4084 | ||
858377e4 SH |
4085 | WRAP_API(bool, lxcapi_may_control) |
4086 | ||
d5aa23e6 SH |
4087 | static bool do_add_remove_node(pid_t init_pid, const char *path, bool add, |
4088 | struct stat *st) | |
4089 | { | |
4090 | char chrootpath[MAXPATHLEN]; | |
4091 | char *directory_path = NULL; | |
4092 | pid_t pid; | |
4093 | int ret; | |
4094 | ||
4095 | if ((pid = fork()) < 0) { | |
4096 | SYSERROR("failed to fork a child helper"); | |
4097 | return false; | |
4098 | } | |
4099 | if (pid) { | |
4100 | if (wait_for_pid(pid) != 0) { | |
4101 | ERROR("Failed to create note in guest"); | |
4102 | return false; | |
4103 | } | |
4104 | return true; | |
4105 | } | |
4106 | ||
4107 | /* prepare the path */ | |
4108 | ret = snprintf(chrootpath, MAXPATHLEN, "/proc/%d/root", init_pid); | |
4109 | if (ret < 0 || ret >= MAXPATHLEN) | |
4110 | return false; | |
4111 | ||
6b9324bd | 4112 | if (chroot(chrootpath) < 0) |
d5aa23e6 | 4113 | exit(1); |
6b9324bd | 4114 | if (chdir("/") < 0) |
d5aa23e6 SH |
4115 | exit(1); |
4116 | /* remove path if it exists */ | |
4117 | if(faccessat(AT_FDCWD, path, F_OK, AT_SYMLINK_NOFOLLOW) == 0) { | |
4118 | if (unlink(path) < 0) { | |
4119 | ERROR("unlink failed"); | |
4120 | exit(1); | |
4121 | } | |
4122 | } | |
4123 | if (!add) | |
4124 | exit(0); | |
4125 | ||
4126 | /* create any missing directories */ | |
4127 | directory_path = dirname(strdup(path)); | |
4128 | if (mkdir_p(directory_path, 0755) < 0 && errno != EEXIST) { | |
4129 | ERROR("failed to create directory"); | |
4130 | exit(1); | |
4131 | } | |
4132 | ||
4133 | /* create the device node */ | |
4134 | if (mknod(path, st->st_mode, st->st_rdev) < 0) { | |
4135 | ERROR("mknod failed"); | |
4136 | exit(1); | |
4137 | } | |
4138 | ||
4139 | exit(0); | |
4140 | } | |
4141 | ||
f0ca2726 | 4142 | static bool add_remove_device_node(struct lxc_container *c, const char *src_path, const char *dest_path, bool add) |
a9a0ed90 ÇO |
4143 | { |
4144 | int ret; | |
4145 | struct stat st; | |
a9a0ed90 | 4146 | char value[MAX_BUFFER]; |
f0ca2726 | 4147 | const char *p; |
a9a0ed90 ÇO |
4148 | |
4149 | /* make sure container is running */ | |
858377e4 | 4150 | if (!do_lxcapi_is_running(c)) { |
a9a0ed90 | 4151 | ERROR("container is not running"); |
d5aa23e6 | 4152 | return false; |
a9a0ed90 ÇO |
4153 | } |
4154 | ||
4155 | /* use src_path if dest_path is NULL otherwise use dest_path */ | |
4156 | p = dest_path ? dest_path : src_path; | |
4157 | ||
a9a0ed90 ÇO |
4158 | /* make sure we can access p */ |
4159 | if(access(p, F_OK) < 0 || stat(p, &st) < 0) | |
d5aa23e6 | 4160 | return false; |
a9a0ed90 ÇO |
4161 | |
4162 | /* continue if path is character device or block device */ | |
c6a9b0d7 | 4163 | if (S_ISCHR(st.st_mode)) |
a9a0ed90 | 4164 | ret = snprintf(value, MAX_BUFFER, "c %d:%d rwm", major(st.st_rdev), minor(st.st_rdev)); |
c6a9b0d7 | 4165 | else if (S_ISBLK(st.st_mode)) |
a9a0ed90 ÇO |
4166 | ret = snprintf(value, MAX_BUFFER, "b %d:%d rwm", major(st.st_rdev), minor(st.st_rdev)); |
4167 | else | |
d5aa23e6 | 4168 | return false; |
a9a0ed90 ÇO |
4169 | |
4170 | /* check snprintf return code */ | |
4171 | if (ret < 0 || ret >= MAX_BUFFER) | |
d5aa23e6 | 4172 | return false; |
a9a0ed90 | 4173 | |
858377e4 | 4174 | if (!do_add_remove_node(do_lxcapi_init_pid(c), p, add, &st)) |
d5aa23e6 | 4175 | return false; |
a9a0ed90 | 4176 | |
d5aa23e6 | 4177 | /* add or remove device to/from cgroup access list */ |
a9a0ed90 | 4178 | if (add) { |
858377e4 | 4179 | if (!do_lxcapi_set_cgroup_item(c, "devices.allow", value)) { |
a9a0ed90 | 4180 | ERROR("set_cgroup_item failed while adding the device node"); |
d5aa23e6 | 4181 | return false; |
a9a0ed90 ÇO |
4182 | } |
4183 | } else { | |
858377e4 | 4184 | if (!do_lxcapi_set_cgroup_item(c, "devices.deny", value)) { |
a9a0ed90 | 4185 | ERROR("set_cgroup_item failed while removing the device node"); |
d5aa23e6 | 4186 | return false; |
a9a0ed90 ÇO |
4187 | } |
4188 | } | |
d5aa23e6 | 4189 | |
a9a0ed90 | 4190 | return true; |
a9a0ed90 ÇO |
4191 | } |
4192 | ||
858377e4 | 4193 | static bool do_lxcapi_add_device_node(struct lxc_container *c, const char *src_path, const char *dest_path) |
a9a0ed90 | 4194 | { |
c868b261 ÇO |
4195 | if (am_unpriv()) { |
4196 | ERROR(NOT_SUPPORTED_ERROR, __FUNCTION__); | |
4197 | return false; | |
4198 | } | |
a9a0ed90 ÇO |
4199 | return add_remove_device_node(c, src_path, dest_path, true); |
4200 | } | |
4201 | ||
858377e4 SH |
4202 | WRAP_API_2(bool, lxcapi_add_device_node, const char *, const char *) |
4203 | ||
4204 | static bool do_lxcapi_remove_device_node(struct lxc_container *c, const char *src_path, const char *dest_path) | |
a9a0ed90 | 4205 | { |
c868b261 ÇO |
4206 | if (am_unpriv()) { |
4207 | ERROR(NOT_SUPPORTED_ERROR, __FUNCTION__); | |
4208 | return false; | |
4209 | } | |
a9a0ed90 ÇO |
4210 | return add_remove_device_node(c, src_path, dest_path, false); |
4211 | } | |
4212 | ||
858377e4 SH |
4213 | WRAP_API_2(bool, lxcapi_remove_device_node, const char *, const char *) |
4214 | ||
4215 | static bool do_lxcapi_attach_interface(struct lxc_container *c, const char *ifname, | |
e58fae8f DY |
4216 | const char *dst_ifname) |
4217 | { | |
4218 | int ret = 0; | |
4219 | if (am_unpriv()) { | |
4220 | ERROR(NOT_SUPPORTED_ERROR, __FUNCTION__); | |
4221 | return false; | |
4222 | } | |
4223 | ||
4224 | if (!ifname) { | |
4225 | ERROR("No source interface name given"); | |
4226 | return false; | |
4227 | } | |
4228 | ||
4229 | ret = lxc_netdev_isup(ifname); | |
e58fae8f | 4230 | |
e5848d39 SH |
4231 | if (ret > 0) { |
4232 | /* netdev of ifname is up. */ | |
e58fae8f DY |
4233 | ret = lxc_netdev_down(ifname); |
4234 | if (ret) | |
4235 | goto err; | |
4236 | } | |
4237 | ||
858377e4 | 4238 | ret = lxc_netdev_move_by_name(ifname, do_lxcapi_init_pid(c), dst_ifname); |
e58fae8f DY |
4239 | if (ret) |
4240 | goto err; | |
4241 | ||
4242 | return true; | |
e5848d39 | 4243 | |
e58fae8f | 4244 | err: |
e58fae8f DY |
4245 | return false; |
4246 | } | |
4247 | ||
858377e4 SH |
4248 | WRAP_API_2(bool, lxcapi_attach_interface, const char *, const char *) |
4249 | ||
4250 | static bool do_lxcapi_detach_interface(struct lxc_container *c, const char *ifname, | |
e58fae8f DY |
4251 | const char *dst_ifname) |
4252 | { | |
4253 | pid_t pid, pid_outside; | |
4254 | ||
4255 | if (am_unpriv()) { | |
4256 | ERROR(NOT_SUPPORTED_ERROR, __FUNCTION__); | |
4257 | return false; | |
4258 | } | |
4259 | ||
4260 | if (!ifname) { | |
4261 | ERROR("No source interface name given"); | |
4262 | return false; | |
4263 | } | |
4264 | ||
4265 | pid_outside = getpid(); | |
4266 | pid = fork(); | |
4267 | if (pid < 0) { | |
4268 | ERROR("failed to fork task to get interfaces information"); | |
4269 | return false; | |
4270 | } | |
4271 | ||
4272 | if (pid == 0) { // child | |
4273 | int ret = 0; | |
e0f59189 | 4274 | if (!enter_net_ns(c)) { |
e58fae8f DY |
4275 | ERROR("failed to enter namespace"); |
4276 | exit(-1); | |
4277 | } | |
4278 | ||
4279 | ret = lxc_netdev_isup(ifname); | |
4280 | if (ret < 0) | |
4281 | exit(ret); | |
4282 | ||
4283 | /* netdev of ifname is up. */ | |
4284 | if (ret) { | |
4285 | ret = lxc_netdev_down(ifname); | |
4286 | if (ret) | |
4287 | exit(ret); | |
4288 | } | |
4289 | ||
4290 | ret = lxc_netdev_move_by_name(ifname, pid_outside, dst_ifname); | |
4291 | ||
4292 | /* -EINVAL means there is no netdev named as ifanme. */ | |
4293 | if (ret == -EINVAL) { | |
4294 | ERROR("No network device named as %s.", ifname); | |
4295 | } | |
4296 | exit(ret); | |
4297 | } | |
4298 | ||
4299 | if (wait_for_pid(pid) != 0) | |
4300 | return false; | |
4301 | ||
4302 | return true; | |
4303 | } | |
4304 | ||
858377e4 SH |
4305 | WRAP_API_2(bool, lxcapi_detach_interface, const char *, const char *) |
4306 | ||
aef3d51e TA |
4307 | static int do_lxcapi_migrate(struct lxc_container *c, unsigned int cmd, |
4308 | struct migrate_opts *opts, unsigned int size) | |
bbd4e13e | 4309 | { |
aef3d51e | 4310 | int ret; |
2cb80427 | 4311 | struct migrate_opts *valid_opts = opts; |
85c50991 | 4312 | |
aef3d51e TA |
4313 | /* If the caller has a bigger (newer) struct migrate_opts, let's make |
4314 | * sure that the stuff on the end is zero, i.e. that they didn't ask us | |
4315 | * to do anything special. | |
4316 | */ | |
4317 | if (size > sizeof(*opts)) { | |
4318 | unsigned char *addr; | |
4319 | unsigned char *end; | |
4320 | ||
4321 | addr = (void *)opts + sizeof(*opts); | |
4322 | end = (void *)opts + size; | |
4323 | for (; addr < end; addr++) { | |
4324 | if (*addr) { | |
4325 | return -E2BIG; | |
4326 | } | |
4327 | } | |
85c50991 TA |
4328 | } |
4329 | ||
2cb80427 TA |
4330 | /* If the caller has a smaller struct, let's zero out the end for them |
4331 | * so we don't accidentally use bits of it that they didn't know about | |
4332 | * to initialize. | |
4333 | */ | |
4334 | if (size < sizeof(*opts)) { | |
4335 | valid_opts = malloc(sizeof(*opts)); | |
4336 | if (!valid_opts) | |
4337 | return -ENOMEM; | |
4338 | ||
4339 | memset(valid_opts, 0, sizeof(*opts)); | |
4340 | memcpy(valid_opts, opts, size); | |
4341 | } | |
4342 | ||
aef3d51e TA |
4343 | switch (cmd) { |
4344 | case MIGRATE_PRE_DUMP: | |
7ad13c91 TA |
4345 | if (!do_lxcapi_is_running(c)) { |
4346 | ERROR("container is not running"); | |
4347 | return false; | |
4348 | } | |
2cb80427 | 4349 | ret = !__criu_pre_dump(c, valid_opts); |
aef3d51e TA |
4350 | break; |
4351 | case MIGRATE_DUMP: | |
7ad13c91 TA |
4352 | if (!do_lxcapi_is_running(c)) { |
4353 | ERROR("container is not running"); | |
4354 | return false; | |
4355 | } | |
2cb80427 | 4356 | ret = !__criu_dump(c, valid_opts); |
aef3d51e TA |
4357 | break; |
4358 | case MIGRATE_RESTORE: | |
7ad13c91 TA |
4359 | if (do_lxcapi_is_running(c)) { |
4360 | ERROR("container is already running"); | |
4361 | return false; | |
4362 | } | |
2cb80427 | 4363 | ret = !__criu_restore(c, valid_opts); |
aef3d51e TA |
4364 | break; |
4365 | default: | |
4366 | ERROR("invalid migrate command %u", cmd); | |
4367 | ret = -EINVAL; | |
4368 | } | |
735f2c6e | 4369 | |
f686506d TA |
4370 | if (size < sizeof(*opts)) |
4371 | free(valid_opts); | |
4372 | ||
aef3d51e TA |
4373 | return ret; |
4374 | } | |
735f2c6e | 4375 | |
aef3d51e | 4376 | WRAP_API_3(int, lxcapi_migrate, unsigned int, struct migrate_opts *, unsigned int) |
735f2c6e | 4377 | |
aef3d51e TA |
4378 | static bool do_lxcapi_checkpoint(struct lxc_container *c, char *directory, bool stop, bool verbose) |
4379 | { | |
ebb088e1 AR |
4380 | struct migrate_opts opts; |
4381 | ||
4382 | memset(&opts, 0, sizeof(opts)); | |
4383 | ||
4384 | opts.directory = directory; | |
4385 | opts.stop = stop; | |
4386 | opts.verbose = verbose; | |
735f2c6e | 4387 | |
aef3d51e | 4388 | return !do_lxcapi_migrate(c, MIGRATE_DUMP, &opts, sizeof(opts)); |
735f2c6e TA |
4389 | } |
4390 | ||
858377e4 SH |
4391 | WRAP_API_3(bool, lxcapi_checkpoint, char *, bool, bool) |
4392 | ||
4393 | static bool do_lxcapi_restore(struct lxc_container *c, char *directory, bool verbose) | |
c9d8f2ee | 4394 | { |
ebb088e1 AR |
4395 | struct migrate_opts opts; |
4396 | ||
4397 | memset(&opts, 0, sizeof(opts)); | |
4398 | ||
4399 | opts.directory = directory; | |
4400 | opts.verbose = verbose; | |
c9d8f2ee | 4401 | |
aef3d51e | 4402 | return !do_lxcapi_migrate(c, MIGRATE_RESTORE, &opts, sizeof(opts)); |
735f2c6e TA |
4403 | } |
4404 | ||
858377e4 SH |
4405 | WRAP_API_2(bool, lxcapi_restore, char *, bool) |
4406 | ||
a0e93eeb CS |
4407 | static int lxcapi_attach_run_waitl(struct lxc_container *c, lxc_attach_options_t *options, const char *program, const char *arg, ...) |
4408 | { | |
4409 | va_list ap; | |
4410 | const char **argv; | |
4411 | int ret; | |
4412 | ||
4413 | if (!c) | |
4414 | return -1; | |
4415 | ||
858377e4 SH |
4416 | current_config = c->lxc_conf; |
4417 | ||
a0e93eeb CS |
4418 | va_start(ap, arg); |
4419 | argv = lxc_va_arg_list_to_argv_const(ap, 1); | |
4420 | va_end(ap); | |
4421 | ||
4422 | if (!argv) { | |
4423 | ERROR("Memory allocation error."); | |
858377e4 SH |
4424 | ret = -1; |
4425 | goto out; | |
a0e93eeb CS |
4426 | } |
4427 | argv[0] = arg; | |
4428 | ||
858377e4 | 4429 | ret = do_lxcapi_attach_run_wait(c, options, program, (const char * const *)argv); |
a0e93eeb | 4430 | free((void*)argv); |
858377e4 SH |
4431 | out: |
4432 | current_config = NULL; | |
a0e93eeb CS |
4433 | return ret; |
4434 | } | |
4435 | ||
afeecbba | 4436 | struct lxc_container *lxc_container_new(const char *name, const char *configpath) |
72d0e1cb SG |
4437 | { |
4438 | struct lxc_container *c; | |
72d0e1cb | 4439 | |
18aa217b SH |
4440 | if (!name) |
4441 | return NULL; | |
4442 | ||
72d0e1cb SG |
4443 | c = malloc(sizeof(*c)); |
4444 | if (!c) { | |
4445 | fprintf(stderr, "failed to malloc lxc_container\n"); | |
4446 | return NULL; | |
4447 | } | |
4448 | memset(c, 0, sizeof(*c)); | |
4449 | ||
afeecbba SH |
4450 | if (configpath) |
4451 | c->config_path = strdup(configpath); | |
4452 | else | |
593e8478 | 4453 | c->config_path = strdup(lxc_global_config_value("lxc.lxcpath")); |
afeecbba | 4454 | |
2a59a681 | 4455 | if (!c->config_path) { |
03fadd16 | 4456 | fprintf(stderr, "Out of memory\n"); |
2a59a681 SH |
4457 | goto err; |
4458 | } | |
4459 | ||
f5dd1d53 | 4460 | remove_trailing_slashes(c->config_path); |
72d0e1cb SG |
4461 | c->name = malloc(strlen(name)+1); |
4462 | if (!c->name) { | |
4463 | fprintf(stderr, "Error allocating lxc_container name\n"); | |
4464 | goto err; | |
4465 | } | |
4466 | strcpy(c->name, name); | |
4467 | ||
4468 | c->numthreads = 1; | |
df271a59 | 4469 | if (!(c->slock = lxc_newlock(c->config_path, name))) { |
72d0e1cb SG |
4470 | fprintf(stderr, "failed to create lock\n"); |
4471 | goto err; | |
4472 | } | |
4473 | ||
df271a59 | 4474 | if (!(c->privlock = lxc_newlock(NULL, NULL))) { |
72d0e1cb SG |
4475 | fprintf(stderr, "failed to alloc privlock\n"); |
4476 | goto err; | |
4477 | } | |
4478 | ||
afeecbba | 4479 | if (!set_config_filename(c)) { |
72d0e1cb SG |
4480 | fprintf(stderr, "Error allocating config file pathname\n"); |
4481 | goto err; | |
4482 | } | |
72d0e1cb | 4483 | |
bac806d1 SH |
4484 | if (file_exists(c->configfile) && !lxcapi_load_config(c, NULL)) |
4485 | goto err; | |
72d0e1cb | 4486 | |
3e625e2d SH |
4487 | if (ongoing_create(c) == 2) { |
4488 | ERROR("Error: %s creation was not completed", c->name); | |
17a367d8 | 4489 | container_destroy(c, NULL); |
4df7f012 | 4490 | lxcapi_clear_config(c); |
3e625e2d | 4491 | } |
a2739df5 | 4492 | c->daemonize = true; |
72cf75fa | 4493 | c->pidfile = NULL; |
3e625e2d | 4494 | |
72d0e1cb SG |
4495 | // assign the member functions |
4496 | c->is_defined = lxcapi_is_defined; | |
4497 | c->state = lxcapi_state; | |
4498 | c->is_running = lxcapi_is_running; | |
4499 | c->freeze = lxcapi_freeze; | |
4500 | c->unfreeze = lxcapi_unfreeze; | |
0115f8fd | 4501 | c->console = lxcapi_console; |
b5159817 | 4502 | c->console_getfd = lxcapi_console_getfd; |
72d0e1cb SG |
4503 | c->init_pid = lxcapi_init_pid; |
4504 | c->load_config = lxcapi_load_config; | |
4505 | c->want_daemonize = lxcapi_want_daemonize; | |
130a1888 | 4506 | c->want_close_all_fds = lxcapi_want_close_all_fds; |
72d0e1cb SG |
4507 | c->start = lxcapi_start; |
4508 | c->startl = lxcapi_startl; | |
4509 | c->stop = lxcapi_stop; | |
4510 | c->config_file_name = lxcapi_config_file_name; | |
4511 | c->wait = lxcapi_wait; | |
4512 | c->set_config_item = lxcapi_set_config_item; | |
4513 | c->destroy = lxcapi_destroy; | |
18aa217b | 4514 | c->destroy_with_snapshots = lxcapi_destroy_with_snapshots; |
06e5650e | 4515 | c->rename = lxcapi_rename; |
72d0e1cb SG |
4516 | c->save_config = lxcapi_save_config; |
4517 | c->get_keys = lxcapi_get_keys; | |
4518 | c->create = lxcapi_create; | |
4519 | c->createl = lxcapi_createl; | |
4520 | c->shutdown = lxcapi_shutdown; | |
3e625e2d | 4521 | c->reboot = lxcapi_reboot; |
4df7f012 | 4522 | c->clear_config = lxcapi_clear_config; |
72d0e1cb SG |
4523 | c->clear_config_item = lxcapi_clear_config_item; |
4524 | c->get_config_item = lxcapi_get_config_item; | |
8ac18377 | 4525 | c->get_running_config_item = lxcapi_get_running_config_item; |
794dd120 SH |
4526 | c->get_cgroup_item = lxcapi_get_cgroup_item; |
4527 | c->set_cgroup_item = lxcapi_set_cgroup_item; | |
2a59a681 SH |
4528 | c->get_config_path = lxcapi_get_config_path; |
4529 | c->set_config_path = lxcapi_set_config_path; | |
9be53773 | 4530 | c->clone = lxcapi_clone; |
799f29ab | 4531 | c->get_interfaces = lxcapi_get_interfaces; |
9c83a661 | 4532 | c->get_ips = lxcapi_get_ips; |
a0e93eeb CS |
4533 | c->attach = lxcapi_attach; |
4534 | c->attach_run_wait = lxcapi_attach_run_wait; | |
4535 | c->attach_run_waitl = lxcapi_attach_run_waitl; | |
f5dd1d53 SH |
4536 | c->snapshot = lxcapi_snapshot; |
4537 | c->snapshot_list = lxcapi_snapshot_list; | |
4538 | c->snapshot_restore = lxcapi_snapshot_restore; | |
771d96b3 | 4539 | c->snapshot_destroy = lxcapi_snapshot_destroy; |
18aa217b | 4540 | c->snapshot_destroy_all = lxcapi_snapshot_destroy_all; |
b494d2dd | 4541 | c->may_control = lxcapi_may_control; |
a9a0ed90 ÇO |
4542 | c->add_device_node = lxcapi_add_device_node; |
4543 | c->remove_device_node = lxcapi_remove_device_node; | |
e58fae8f DY |
4544 | c->attach_interface = lxcapi_attach_interface; |
4545 | c->detach_interface = lxcapi_detach_interface; | |
735f2c6e TA |
4546 | c->checkpoint = lxcapi_checkpoint; |
4547 | c->restore = lxcapi_restore; | |
aef3d51e | 4548 | c->migrate = lxcapi_migrate; |
72d0e1cb | 4549 | |
72d0e1cb SG |
4550 | return c; |
4551 | ||
4552 | err: | |
4553 | lxc_container_free(c); | |
4554 | return NULL; | |
4555 | } | |
4556 | ||
4a7c7daa | 4557 | int lxc_get_wait_states(const char **states) |
72d0e1cb SG |
4558 | { |
4559 | int i; | |
4560 | ||
4561 | if (states) | |
4562 | for (i=0; i<MAX_STATE; i++) | |
4563 | states[i] = lxc_state2str(i); | |
4564 | return MAX_STATE; | |
4565 | } | |
a41f104b | 4566 | |
a41f104b SH |
4567 | /* |
4568 | * These next two could probably be done smarter with reusing a common function | |
4569 | * with different iterators and tests... | |
4570 | */ | |
4571 | int list_defined_containers(const char *lxcpath, char ***names, struct lxc_container ***cret) | |
4572 | { | |
4573 | DIR *dir; | |
4574 | int i, cfound = 0, nfound = 0; | |
74f96976 | 4575 | struct dirent *direntp; |
a41f104b SH |
4576 | struct lxc_container *c; |
4577 | ||
4578 | if (!lxcpath) | |
593e8478 | 4579 | lxcpath = lxc_global_config_value("lxc.lxcpath"); |
a41f104b | 4580 | |
a41f104b | 4581 | dir = opendir(lxcpath); |
a41f104b SH |
4582 | if (!dir) { |
4583 | SYSERROR("opendir on lxcpath"); | |
4584 | return -1; | |
4585 | } | |
4586 | ||
4587 | if (cret) | |
4588 | *cret = NULL; | |
4589 | if (names) | |
4590 | *names = NULL; | |
4591 | ||
74f96976 | 4592 | while ((direntp = readdir(dir))) { |
a41f104b SH |
4593 | if (!direntp) |
4594 | break; | |
e4ebeab1 CALP |
4595 | |
4596 | // Ignore '.', '..' and any hidden directory | |
4597 | if (!strncmp(direntp->d_name, ".", 1)) | |
a41f104b SH |
4598 | continue; |
4599 | ||
4600 | if (!config_file_exists(lxcpath, direntp->d_name)) | |
4601 | continue; | |
4602 | ||
4603 | if (names) { | |
9c88ff1f | 4604 | if (!add_to_array(names, direntp->d_name, cfound)) |
a41f104b SH |
4605 | goto free_bad; |
4606 | } | |
4607 | cfound++; | |
4608 | ||
4609 | if (!cret) { | |
4610 | nfound++; | |
4611 | continue; | |
4612 | } | |
4613 | ||
4614 | c = lxc_container_new(direntp->d_name, lxcpath); | |
4615 | if (!c) { | |
4616 | INFO("Container %s:%s has a config but could not be loaded", | |
4617 | lxcpath, direntp->d_name); | |
4618 | if (names) | |
9c88ff1f ÇO |
4619 | if(!remove_from_array(names, direntp->d_name, cfound--)) |
4620 | goto free_bad; | |
a41f104b SH |
4621 | continue; |
4622 | } | |
858377e4 | 4623 | if (!do_lxcapi_is_defined(c)) { |
a41f104b SH |
4624 | INFO("Container %s:%s has a config but is not defined", |
4625 | lxcpath, direntp->d_name); | |
4626 | if (names) | |
9c88ff1f ÇO |
4627 | if(!remove_from_array(names, direntp->d_name, cfound--)) |
4628 | goto free_bad; | |
a41f104b SH |
4629 | lxc_container_put(c); |
4630 | continue; | |
4631 | } | |
4632 | ||
2871830a | 4633 | if (!add_to_clist(cret, c, nfound, true)) { |
a41f104b SH |
4634 | lxc_container_put(c); |
4635 | goto free_bad; | |
4636 | } | |
4637 | nfound++; | |
4638 | } | |
4639 | ||
a41f104b | 4640 | closedir(dir); |
a41f104b SH |
4641 | return nfound; |
4642 | ||
4643 | free_bad: | |
4644 | if (names && *names) { | |
4645 | for (i=0; i<cfound; i++) | |
4646 | free((*names)[i]); | |
4647 | free(*names); | |
4648 | } | |
4649 | if (cret && *cret) { | |
4650 | for (i=0; i<nfound; i++) | |
4651 | lxc_container_put((*cret)[i]); | |
4652 | free(*cret); | |
4653 | } | |
a41f104b | 4654 | closedir(dir); |
a41f104b SH |
4655 | return -1; |
4656 | } | |
4657 | ||
148a9d27 DE |
4658 | int list_active_containers(const char *lxcpath, char ***nret, |
4659 | struct lxc_container ***cret) | |
a41f104b | 4660 | { |
148a9d27 | 4661 | int i, ret = -1, cret_cnt = 0, ct_name_cnt = 0; |
a41f104b SH |
4662 | int lxcpath_len; |
4663 | char *line = NULL; | |
148a9d27 | 4664 | char **ct_name = NULL; |
a41f104b | 4665 | size_t len = 0; |
97bc2422 | 4666 | struct lxc_container *c = NULL; |
88556fd7 | 4667 | bool is_hashed; |
a41f104b SH |
4668 | |
4669 | if (!lxcpath) | |
593e8478 | 4670 | lxcpath = lxc_global_config_value("lxc.lxcpath"); |
a41f104b SH |
4671 | lxcpath_len = strlen(lxcpath); |
4672 | ||
4673 | if (cret) | |
4674 | *cret = NULL; | |
148a9d27 DE |
4675 | if (nret) |
4676 | *nret = NULL; | |
a41f104b | 4677 | |
a41f104b | 4678 | FILE *f = fopen("/proc/net/unix", "r"); |
a41f104b SH |
4679 | if (!f) |
4680 | return -1; | |
4681 | ||
4682 | while (getline(&line, &len, f) != -1) { | |
88556fd7 | 4683 | |
0f8f9c8a | 4684 | char *p = strrchr(line, ' '), *p2; |
a41f104b SH |
4685 | if (!p) |
4686 | continue; | |
4687 | p++; | |
4688 | if (*p != 0x40) | |
4689 | continue; | |
4690 | p++; | |
88556fd7 ÇO |
4691 | |
4692 | is_hashed = false; | |
4693 | if (strncmp(p, lxcpath, lxcpath_len) == 0) { | |
4694 | p += lxcpath_len; | |
4695 | } else if (strncmp(p, "lxc/", 4) == 0) { | |
4696 | p += 4; | |
4697 | is_hashed = true; | |
4698 | } else { | |
a41f104b | 4699 | continue; |
88556fd7 ÇO |
4700 | } |
4701 | ||
a41f104b SH |
4702 | while (*p == '/') |
4703 | p++; | |
4704 | ||
4705 | // Now p is the start of lxc_name | |
46cd2845 | 4706 | p2 = strchr(p, '/'); |
a41f104b SH |
4707 | if (!p2 || strncmp(p2, "/command", 8) != 0) |
4708 | continue; | |
4709 | *p2 = '\0'; | |
4710 | ||
88556fd7 | 4711 | if (is_hashed) { |
899a9f55 CB |
4712 | char *recvpath = lxc_cmd_get_lxcpath(p); |
4713 | if (!recvpath) | |
4714 | continue; | |
4715 | if (strncmp(lxcpath, recvpath, lxcpath_len) != 0) | |
88556fd7 ÇO |
4716 | continue; |
4717 | p = lxc_cmd_get_name(p); | |
4718 | } | |
4719 | ||
148a9d27 | 4720 | if (array_contains(&ct_name, p, ct_name_cnt)) |
9c88ff1f ÇO |
4721 | continue; |
4722 | ||
148a9d27 DE |
4723 | if (!add_to_array(&ct_name, p, ct_name_cnt)) |
4724 | goto free_cret_list; | |
9c88ff1f | 4725 | |
148a9d27 | 4726 | ct_name_cnt++; |
a41f104b | 4727 | |
148a9d27 | 4728 | if (!cret) |
a41f104b | 4729 | continue; |
a41f104b SH |
4730 | |
4731 | c = lxc_container_new(p, lxcpath); | |
4732 | if (!c) { | |
4733 | INFO("Container %s:%s is running but could not be loaded", | |
4734 | lxcpath, p); | |
148a9d27 | 4735 | remove_from_array(&ct_name, p, ct_name_cnt--); |
a41f104b SH |
4736 | continue; |
4737 | } | |
4738 | ||
4739 | /* | |
4740 | * If this is an anonymous container, then is_defined *can* | |
4741 | * return false. So we don't do that check. Count on the | |
4742 | * fact that the command socket exists. | |
4743 | */ | |
4744 | ||
148a9d27 | 4745 | if (!add_to_clist(cret, c, cret_cnt, true)) { |
a41f104b | 4746 | lxc_container_put(c); |
148a9d27 | 4747 | goto free_cret_list; |
a41f104b | 4748 | } |
148a9d27 | 4749 | cret_cnt++; |
a41f104b SH |
4750 | } |
4751 | ||
97bc2422 CB |
4752 | if (nret && cret && cret_cnt != ct_name_cnt) { |
4753 | if (c) | |
4754 | lxc_container_put(c); | |
4755 | goto free_cret_list; | |
4756 | } | |
4757 | ||
148a9d27 DE |
4758 | ret = ct_name_cnt; |
4759 | if (nret) | |
4760 | *nret = ct_name; | |
4761 | else | |
4762 | goto free_ct_name; | |
4763 | goto out; | |
a41f104b | 4764 | |
148a9d27 | 4765 | free_cret_list: |
a41f104b | 4766 | if (cret && *cret) { |
148a9d27 | 4767 | for (i = 0; i < cret_cnt; i++) |
a41f104b SH |
4768 | lxc_container_put((*cret)[i]); |
4769 | free(*cret); | |
4770 | } | |
148a9d27 DE |
4771 | |
4772 | free_ct_name: | |
4773 | if (ct_name) { | |
4774 | for (i = 0; i < ct_name_cnt; i++) | |
4775 | free(ct_name[i]); | |
4776 | free(ct_name); | |
4777 | } | |
4778 | ||
4779 | out: | |
f10fad2f | 4780 | free(line); |
e853a32d | 4781 | |
a41f104b | 4782 | fclose(f); |
148a9d27 | 4783 | return ret; |
a41f104b | 4784 | } |
2871830a DE |
4785 | |
4786 | int list_all_containers(const char *lxcpath, char ***nret, | |
4787 | struct lxc_container ***cret) | |
4788 | { | |
4789 | int i, ret, active_cnt, ct_cnt, ct_list_cnt; | |
4790 | char **active_name; | |
4791 | char **ct_name; | |
4792 | struct lxc_container **ct_list = NULL; | |
4793 | ||
4794 | ct_cnt = list_defined_containers(lxcpath, &ct_name, NULL); | |
4795 | if (ct_cnt < 0) | |
4796 | return ct_cnt; | |
4797 | ||
4798 | active_cnt = list_active_containers(lxcpath, &active_name, NULL); | |
4799 | if (active_cnt < 0) { | |
4800 | ret = active_cnt; | |
4801 | goto free_ct_name; | |
4802 | } | |
4803 | ||
4804 | for (i = 0; i < active_cnt; i++) { | |
4805 | if (!array_contains(&ct_name, active_name[i], ct_cnt)) { | |
4806 | if (!add_to_array(&ct_name, active_name[i], ct_cnt)) { | |
4807 | ret = -1; | |
4808 | goto free_active_name; | |
4809 | } | |
4810 | ct_cnt++; | |
4811 | } | |
4812 | free(active_name[i]); | |
4813 | active_name[i] = NULL; | |
4814 | } | |
4815 | free(active_name); | |
4816 | active_name = NULL; | |
4817 | active_cnt = 0; | |
4818 | ||
4819 | for (i = 0, ct_list_cnt = 0; i < ct_cnt && cret; i++) { | |
4820 | struct lxc_container *c; | |
4821 | ||
4822 | c = lxc_container_new(ct_name[i], lxcpath); | |
4823 | if (!c) { | |
4824 | WARN("Container %s:%s could not be loaded", lxcpath, ct_name[i]); | |
4825 | remove_from_array(&ct_name, ct_name[i], ct_cnt--); | |
4826 | continue; | |
4827 | } | |
4828 | ||
4829 | if (!add_to_clist(&ct_list, c, ct_list_cnt, false)) { | |
4830 | lxc_container_put(c); | |
4831 | ret = -1; | |
4832 | goto free_ct_list; | |
4833 | } | |
4834 | ct_list_cnt++; | |
4835 | } | |
4836 | ||
4837 | if (cret) | |
4838 | *cret = ct_list; | |
4839 | ||
4840 | if (nret) | |
4841 | *nret = ct_name; | |
4842 | else { | |
4843 | ret = ct_cnt; | |
4844 | goto free_ct_name; | |
4845 | } | |
4846 | return ct_cnt; | |
4847 | ||
4848 | free_ct_list: | |
4849 | for (i = 0; i < ct_list_cnt; i++) { | |
4850 | lxc_container_put(ct_list[i]); | |
4851 | } | |
f10fad2f | 4852 | free(ct_list); |
2871830a DE |
4853 | |
4854 | free_active_name: | |
4855 | for (i = 0; i < active_cnt; i++) { | |
f10fad2f | 4856 | free(active_name[i]); |
2871830a | 4857 | } |
f10fad2f | 4858 | free(active_name); |
2871830a DE |
4859 | |
4860 | free_ct_name: | |
4861 | for (i = 0; i < ct_cnt; i++) { | |
4862 | free(ct_name[i]); | |
4863 | } | |
4864 | free(ct_name); | |
4865 | return ret; | |
4866 | } | |
12461428 CB |
4867 | |
4868 | bool lxc_config_item_is_supported(const char *key) | |
4869 | { | |
4870 | return !!lxc_getconfig(key); | |
4871 | } |