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Commit | Line | Data |
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72d0e1cb SG |
1 | /* liblxcapi |
2 | * | |
3 | * Copyright © 2012 Serge Hallyn <serge.hallyn@ubuntu.com>. | |
4 | * Copyright © 2012 Canonical Ltd. | |
5 | * | |
d75462e4 SH |
6 | * This library is free software; you can redistribute it and/or |
7 | * modify it under the terms of the GNU Lesser General Public | |
8 | * License as published by the Free Software Foundation; either | |
9 | * version 2.1 of the License, or (at your option) any later version. | |
10 | ||
11 | * This library is distributed in the hope that it will be useful, | |
12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
14 | * Lesser General Public License for more details. | |
15 | ||
16 | * You should have received a copy of the GNU Lesser General Public | |
17 | * License along with this library; if not, write to the Free Software | |
18 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA | |
72d0e1cb SG |
19 | */ |
20 | ||
9be53773 | 21 | #define _GNU_SOURCE |
38683db4 | 22 | #include <dirent.h> |
9be53773 | 23 | #include <errno.h> |
93dc5327 | 24 | #include <fcntl.h> |
38683db4 | 25 | #include <grp.h> |
f2363e38 | 26 | #include <libgen.h> |
38683db4 CB |
27 | #include <pthread.h> |
28 | #include <sched.h> | |
29 | #include <stdarg.h> | |
d659597e | 30 | #include <stdint.h> |
9fc7f8c0 | 31 | #include <stdio.h> |
38683db4 CB |
32 | #include <unistd.h> |
33 | #include <arpa/inet.h> | |
66c1f8c2 | 34 | #include <sys/sysmacros.h> |
38683db4 CB |
35 | #include <sys/mman.h> |
36 | #include <sys/mount.h> | |
5f7eba0b | 37 | #include <sys/syscall.h> |
38683db4 CB |
38 | #include <sys/types.h> |
39 | #include <sys/wait.h> | |
f2363e38 | 40 | |
5e5576a4 | 41 | #include "af_unix.h" |
38683db4 | 42 | #include "attach.h" |
38683db4 | 43 | #include "cgroup.h" |
72d0e1cb | 44 | #include "conf.h" |
38683db4 CB |
45 | #include "config.h" |
46 | #include "commands.h" | |
92e35018 | 47 | #include "commands_utils.h" |
72d0e1cb | 48 | #include "confile.h" |
4222a9f4 | 49 | #include "confile_utils.h" |
b5159817 | 50 | #include "console.h" |
e29fe1dd | 51 | #include "criu.h" |
a6f151a7 | 52 | #include "initutils.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" |
9994d140 | 60 | #include "parse.h" |
aa460476 | 61 | #include "start.h" |
38683db4 | 62 | #include "state.h" |
28d832c4 | 63 | #include "storage.h" |
ec5d663c | 64 | #include "storage_utils.h" |
28d832c4 CB |
65 | #include "storage/btrfs.h" |
66 | #include "storage/overlay.h" | |
67 | #include "sync.h" | |
38683db4 CB |
68 | #include "utils.h" |
69 | #include "version.h" | |
4ba0d9af | 70 | |
af6824fc ST |
71 | /* major()/minor() */ |
72 | #ifdef MAJOR_IN_MKDEV | |
73 | # include <sys/mkdev.h> | |
74 | #endif | |
af6824fc | 75 | |
4ba0d9af | 76 | #if HAVE_IFADDRS_H |
9c83a661 | 77 | #include <ifaddrs.h> |
4ba0d9af SG |
78 | #else |
79 | #include <../include/ifaddrs.h> | |
80 | #endif | |
72d0e1cb | 81 | |
684f79a5 SG |
82 | #if IS_BIONIC |
83 | #include <../include/lxcmntent.h> | |
84 | #else | |
85 | #include <mntent.h> | |
86 | #endif | |
87 | ||
a9a0ed90 ÇO |
88 | #define MAX_BUFFER 4096 |
89 | ||
c868b261 ÇO |
90 | #define NOT_SUPPORTED_ERROR "the requested function %s is not currently supported with unprivileged containers" |
91 | ||
5f7eba0b SG |
92 | /* Define faccessat() if missing from the C library */ |
93 | #ifndef HAVE_FACCESSAT | |
94 | static int faccessat(int __fd, const char *__file, int __type, int __flag) | |
95 | { | |
96 | #ifdef __NR_faccessat | |
97 | return syscall(__NR_faccessat, __fd, __file, __type, __flag); | |
98 | #else | |
99 | errno = ENOSYS; | |
100 | return -1; | |
101 | #endif | |
102 | } | |
103 | #endif | |
104 | ||
72d0e1cb SG |
105 | lxc_log_define(lxc_container, lxc); |
106 | ||
858377e4 SH |
107 | static bool do_lxcapi_destroy(struct lxc_container *c); |
108 | static const char *lxcapi_get_config_path(struct lxc_container *c); | |
109 | #define do_lxcapi_get_config_path(c) lxcapi_get_config_path(c) | |
110 | static bool do_lxcapi_set_config_item(struct lxc_container *c, const char *key, const char *v); | |
17a367d8 CB |
111 | static bool container_destroy(struct lxc_container *c, |
112 | struct lxc_storage *storage); | |
858377e4 SH |
113 | static bool get_snappath_dir(struct lxc_container *c, char *snappath); |
114 | static bool lxcapi_snapshot_destroy_all(struct lxc_container *c); | |
115 | static bool do_lxcapi_save_config(struct lxc_container *c, const char *alt_file); | |
116 | ||
a41f104b SH |
117 | static bool config_file_exists(const char *lxcpath, const char *cname) |
118 | { | |
119 | /* $lxcpath + '/' + $cname + '/config' + \0 */ | |
120 | int ret, len = strlen(lxcpath) + strlen(cname) + 9; | |
121 | char *fname = alloca(len); | |
122 | ||
123 | ret = snprintf(fname, len, "%s/%s/config", lxcpath, cname); | |
124 | if (ret < 0 || ret >= len) | |
125 | return false; | |
126 | ||
127 | return file_exists(fname); | |
128 | } | |
129 | ||
3e625e2d SH |
130 | /* |
131 | * A few functions to help detect when a container creation failed. | |
132 | * If a container creation was killed partway through, then trying | |
133 | * to actually start that container could harm the host. We detect | |
134 | * this by creating a 'partial' file under the container directory, | |
135 | * and keeping an advisory lock. When container creation completes, | |
136 | * we remove that file. When we load or try to start a container, if | |
137 | * we find that file, without a flock, we remove the container. | |
138 | */ | |
74a3920a | 139 | static int ongoing_create(struct lxc_container *c) |
3e625e2d SH |
140 | { |
141 | int len = strlen(c->config_path) + strlen(c->name) + 10; | |
142 | char *path = alloca(len); | |
143 | int fd, ret; | |
93dc5327 SH |
144 | struct flock lk; |
145 | ||
3e625e2d SH |
146 | ret = snprintf(path, len, "%s/%s/partial", c->config_path, c->name); |
147 | if (ret < 0 || ret >= len) { | |
148 | ERROR("Error writing partial pathname"); | |
149 | return -1; | |
150 | } | |
151 | ||
152 | if (!file_exists(path)) | |
153 | return 0; | |
025ed0f3 | 154 | fd = open(path, O_RDWR); |
025ed0f3 | 155 | if (fd < 0) { |
1a0e70ac | 156 | /* give benefit of the doubt */ |
3e625e2d | 157 | SYSERROR("Error opening partial file"); |
3e625e2d SH |
158 | return 0; |
159 | } | |
93dc5327 SH |
160 | lk.l_type = F_WRLCK; |
161 | lk.l_whence = SEEK_SET; | |
162 | lk.l_start = 0; | |
163 | lk.l_len = 0; | |
164 | lk.l_pid = -1; | |
165 | if (fcntl(fd, F_GETLK, &lk) == 0 && lk.l_pid != -1) { | |
1a0e70ac | 166 | /* create is still ongoing */ |
3e625e2d | 167 | close(fd); |
3e625e2d SH |
168 | return 1; |
169 | } | |
1a0e70ac | 170 | /* create completed but partial is still there. */ |
3e625e2d | 171 | close(fd); |
3e625e2d SH |
172 | return 2; |
173 | } | |
174 | ||
74a3920a | 175 | static int create_partial(struct lxc_container *c) |
3e625e2d | 176 | { |
1a0e70ac | 177 | /* $lxcpath + '/' + $name + '/partial' + \0 */ |
3e625e2d SH |
178 | int len = strlen(c->config_path) + strlen(c->name) + 10; |
179 | char *path = alloca(len); | |
180 | int fd, ret; | |
93dc5327 SH |
181 | struct flock lk; |
182 | ||
3e625e2d SH |
183 | ret = snprintf(path, len, "%s/%s/partial", c->config_path, c->name); |
184 | if (ret < 0 || ret >= len) { | |
185 | ERROR("Error writing partial pathname"); | |
186 | return -1; | |
187 | } | |
93dc5327 | 188 | if ((fd=open(path, O_RDWR | O_CREAT | O_EXCL, 0755)) < 0) { |
740fe426 | 189 | SYSERROR("Error creating partial file"); |
3e625e2d SH |
190 | return -1; |
191 | } | |
93dc5327 SH |
192 | lk.l_type = F_WRLCK; |
193 | lk.l_whence = SEEK_SET; | |
194 | lk.l_start = 0; | |
195 | lk.l_len = 0; | |
196 | if (fcntl(fd, F_SETLKW, &lk) < 0) { | |
3e625e2d SH |
197 | SYSERROR("Error locking partial file %s", path); |
198 | close(fd); | |
3e625e2d SH |
199 | return -1; |
200 | } | |
3e625e2d SH |
201 | |
202 | return fd; | |
203 | } | |
204 | ||
74a3920a | 205 | static void remove_partial(struct lxc_container *c, int fd) |
3e625e2d | 206 | { |
1a0e70ac | 207 | /* $lxcpath + '/' + $name + '/partial' + \0 */ |
3e625e2d SH |
208 | int len = strlen(c->config_path) + strlen(c->name) + 10; |
209 | char *path = alloca(len); | |
210 | int ret; | |
211 | ||
212 | close(fd); | |
213 | ret = snprintf(path, len, "%s/%s/partial", c->config_path, c->name); | |
214 | if (ret < 0 || ret >= len) { | |
215 | ERROR("Error writing partial pathname"); | |
216 | return; | |
217 | } | |
3e625e2d SH |
218 | if (unlink(path) < 0) |
219 | SYSERROR("Error unlink partial file %s", path); | |
3e625e2d SH |
220 | } |
221 | ||
72d0e1cb | 222 | /* LOCKING |
3bc449ed SH |
223 | * 1. container_mem_lock(c) protects the struct lxc_container from multiple threads. |
224 | * 2. container_disk_lock(c) protects the on-disk container data - in particular the | |
225 | * container configuration file. | |
226 | * The container_disk_lock also takes the container_mem_lock. | |
227 | * 3. thread_mutex protects process data (ex: fd table) from multiple threads. | |
72d0e1cb SG |
228 | * NOTHING mutexes two independent programs with their own struct |
229 | * lxc_container for the same c->name, between API calls. For instance, | |
230 | * c->config_read(); c->start(); Between those calls, data on disk | |
231 | * could change (which shouldn't bother the caller unless for instance | |
232 | * the rootfs get moved). c->config_read(); update; c->config_write(); | |
233 | * Two such updaters could race. The callers should therefore check their | |
234 | * results. Trying to prevent that would necessarily expose us to deadlocks | |
235 | * due to hung callers. So I prefer to keep the locks only within our own | |
236 | * functions, not across functions. | |
237 | * | |
3bc449ed | 238 | * If you're going to clone while holding a lxccontainer, increment |
72d0e1cb SG |
239 | * c->numthreads (under privlock) before forking. When deleting, |
240 | * decrement numthreads under privlock, then if it hits 0 you can delete. | |
241 | * Do not ever use a lxccontainer whose numthreads you did not bump. | |
242 | */ | |
243 | ||
244 | static void lxc_container_free(struct lxc_container *c) | |
245 | { | |
246 | if (!c) | |
247 | return; | |
248 | ||
f10fad2f ME |
249 | free(c->configfile); |
250 | c->configfile = NULL; | |
251 | free(c->error_string); | |
252 | c->error_string = NULL; | |
d95db067 | 253 | if (c->slock) { |
df271a59 | 254 | lxc_putlock(c->slock); |
d95db067 DE |
255 | c->slock = NULL; |
256 | } | |
72d0e1cb | 257 | if (c->privlock) { |
df271a59 | 258 | lxc_putlock(c->privlock); |
72d0e1cb SG |
259 | c->privlock = NULL; |
260 | } | |
f10fad2f ME |
261 | free(c->name); |
262 | c->name = NULL; | |
d95db067 DE |
263 | if (c->lxc_conf) { |
264 | lxc_conf_free(c->lxc_conf); | |
265 | c->lxc_conf = NULL; | |
266 | } | |
f10fad2f ME |
267 | free(c->config_path); |
268 | c->config_path = NULL; | |
72cf75fa | 269 | |
72d0e1cb SG |
270 | free(c); |
271 | } | |
272 | ||
43d1aa34 SH |
273 | /* |
274 | * Consider the following case: | |
275 | freer | racing get()er | |
276 | ================================================================== | |
277 | lxc_container_put() | lxc_container_get() | |
278 | \ lxclock(c->privlock) | c->numthreads < 1? (no) | |
279 | \ c->numthreads = 0 | \ lxclock(c->privlock) -> waits | |
280 | \ lxcunlock() | \ | |
281 | \ lxc_container_free() | \ lxclock() returns | |
282 | | \ c->numthreads < 1 -> return 0 | |
283 | \ \ (free stuff) | | |
284 | \ \ sem_destroy(privlock) | | |
285 | ||
286 | * When the get()er checks numthreads the first time, one of the following | |
287 | * is true: | |
288 | * 1. freer has set numthreads = 0. get() returns 0 | |
289 | * 2. freer is between lxclock and setting numthreads to 0. get()er will | |
290 | * sem_wait on privlock, get lxclock after freer() drops it, then see | |
291 | * numthreads is 0 and exit without touching lxclock again.. | |
292 | * 3. freer has not yet locked privlock. If get()er runs first, then put()er | |
293 | * will see --numthreads = 1 and not call lxc_container_free(). | |
294 | */ | |
295 | ||
72d0e1cb SG |
296 | int lxc_container_get(struct lxc_container *c) |
297 | { | |
298 | if (!c) | |
299 | return 0; | |
300 | ||
1a0e70ac CB |
301 | /* If someone else has already started freeing the container, don't try |
302 | * to take the lock, which may be invalid. | |
303 | */ | |
43d1aa34 SH |
304 | if (c->numthreads < 1) |
305 | return 0; | |
306 | ||
5cee8c50 | 307 | if (container_mem_lock(c)) |
72d0e1cb | 308 | return 0; |
1a0e70ac CB |
309 | |
310 | /* Bail without trying to unlock, bc the privlock is now probably in | |
311 | * freed memory. | |
312 | */ | |
313 | if (c->numthreads < 1) | |
72d0e1cb | 314 | return 0; |
1a0e70ac | 315 | |
72d0e1cb | 316 | c->numthreads++; |
5cee8c50 | 317 | container_mem_unlock(c); |
72d0e1cb SG |
318 | return 1; |
319 | } | |
320 | ||
321 | int lxc_container_put(struct lxc_container *c) | |
322 | { | |
323 | if (!c) | |
324 | return -1; | |
5cee8c50 | 325 | if (container_mem_lock(c)) |
72d0e1cb SG |
326 | return -1; |
327 | if (--c->numthreads < 1) { | |
5cee8c50 | 328 | container_mem_unlock(c); |
72d0e1cb SG |
329 | lxc_container_free(c); |
330 | return 1; | |
331 | } | |
5cee8c50 | 332 | container_mem_unlock(c); |
72d0e1cb SG |
333 | return 0; |
334 | } | |
335 | ||
858377e4 | 336 | static bool do_lxcapi_is_defined(struct lxc_container *c) |
72d0e1cb SG |
337 | { |
338 | struct stat statbuf; | |
339 | bool ret = false; | |
340 | int statret; | |
341 | ||
342 | if (!c) | |
343 | return false; | |
344 | ||
5cee8c50 | 345 | if (container_mem_lock(c)) |
72d0e1cb SG |
346 | return false; |
347 | if (!c->configfile) | |
348 | goto out; | |
349 | statret = stat(c->configfile, &statbuf); | |
350 | if (statret != 0) | |
351 | goto out; | |
352 | ret = true; | |
353 | ||
354 | out: | |
5cee8c50 | 355 | container_mem_unlock(c); |
72d0e1cb SG |
356 | return ret; |
357 | } | |
358 | ||
858377e4 SH |
359 | #define WRAP_API(rettype, fnname) \ |
360 | static rettype fnname(struct lxc_container *c) \ | |
361 | { \ | |
362 | rettype ret; \ | |
8164f0e2 TA |
363 | bool reset_config = false; \ |
364 | \ | |
365 | if (!current_config && c && c->lxc_conf) { \ | |
366 | current_config = c->lxc_conf; \ | |
367 | reset_config = true; \ | |
368 | } \ | |
369 | \ | |
858377e4 | 370 | ret = do_##fnname(c); \ |
8164f0e2 TA |
371 | if (reset_config) \ |
372 | current_config = NULL; \ | |
373 | \ | |
858377e4 SH |
374 | return ret; \ |
375 | } | |
376 | ||
377 | #define WRAP_API_1(rettype, fnname, t1) \ | |
378 | static rettype fnname(struct lxc_container *c, t1 a1) \ | |
379 | { \ | |
380 | rettype ret; \ | |
8164f0e2 TA |
381 | bool reset_config = false; \ |
382 | \ | |
383 | if (!current_config && c && c->lxc_conf) { \ | |
384 | current_config = c->lxc_conf; \ | |
385 | reset_config = true; \ | |
386 | } \ | |
387 | \ | |
858377e4 | 388 | ret = do_##fnname(c, a1); \ |
8164f0e2 TA |
389 | if (reset_config) \ |
390 | current_config = NULL; \ | |
391 | \ | |
858377e4 SH |
392 | return ret; \ |
393 | } | |
394 | ||
395 | #define WRAP_API_2(rettype, fnname, t1, t2) \ | |
396 | static rettype fnname(struct lxc_container *c, t1 a1, t2 a2) \ | |
397 | { \ | |
398 | rettype ret; \ | |
8164f0e2 TA |
399 | bool reset_config = false; \ |
400 | \ | |
401 | if (!current_config && c && c->lxc_conf) { \ | |
402 | current_config = c->lxc_conf; \ | |
403 | reset_config = true; \ | |
404 | } \ | |
405 | \ | |
858377e4 | 406 | ret = do_##fnname(c, a1, a2); \ |
8164f0e2 TA |
407 | if (reset_config) \ |
408 | current_config = NULL; \ | |
409 | \ | |
858377e4 SH |
410 | return ret; \ |
411 | } | |
412 | ||
413 | #define WRAP_API_3(rettype, fnname, t1, t2, t3) \ | |
414 | static rettype fnname(struct lxc_container *c, t1 a1, t2 a2, t3 a3) \ | |
415 | { \ | |
416 | rettype ret; \ | |
8164f0e2 TA |
417 | bool reset_config = false; \ |
418 | \ | |
419 | if (!current_config && c && c->lxc_conf) { \ | |
420 | current_config = c->lxc_conf; \ | |
421 | reset_config = true; \ | |
422 | } \ | |
423 | \ | |
858377e4 | 424 | ret = do_##fnname(c, a1, a2, a3); \ |
8164f0e2 TA |
425 | if (reset_config) \ |
426 | current_config = NULL; \ | |
427 | \ | |
858377e4 SH |
428 | return ret; \ |
429 | } | |
430 | ||
431 | WRAP_API(bool, lxcapi_is_defined) | |
432 | ||
433 | static const char *do_lxcapi_state(struct lxc_container *c) | |
72d0e1cb | 434 | { |
72d0e1cb SG |
435 | lxc_state_t s; |
436 | ||
437 | if (!c) | |
438 | return NULL; | |
13f5be62 | 439 | s = lxc_getstate(c->name, c->config_path); |
39dc698c | 440 | return lxc_state2str(s); |
72d0e1cb SG |
441 | } |
442 | ||
858377e4 SH |
443 | WRAP_API(const char *, lxcapi_state) |
444 | ||
39dc698c | 445 | static bool is_stopped(struct lxc_container *c) |
794dd120 SH |
446 | { |
447 | lxc_state_t s; | |
13f5be62 | 448 | s = lxc_getstate(c->name, c->config_path); |
794dd120 SH |
449 | return (s == STOPPED); |
450 | } | |
451 | ||
858377e4 | 452 | static bool do_lxcapi_is_running(struct lxc_container *c) |
72d0e1cb SG |
453 | { |
454 | const char *s; | |
455 | ||
456 | if (!c) | |
457 | return false; | |
858377e4 | 458 | s = do_lxcapi_state(c); |
72d0e1cb SG |
459 | if (!s || strcmp(s, "STOPPED") == 0) |
460 | return false; | |
461 | return true; | |
462 | } | |
463 | ||
858377e4 SH |
464 | WRAP_API(bool, lxcapi_is_running) |
465 | ||
466 | static bool do_lxcapi_freeze(struct lxc_container *c) | |
72d0e1cb SG |
467 | { |
468 | int ret; | |
469 | if (!c) | |
470 | return false; | |
471 | ||
9123e471 | 472 | ret = lxc_freeze(c->name, c->config_path); |
72d0e1cb SG |
473 | if (ret) |
474 | return false; | |
475 | return true; | |
476 | } | |
477 | ||
858377e4 SH |
478 | WRAP_API(bool, lxcapi_freeze) |
479 | ||
480 | static bool do_lxcapi_unfreeze(struct lxc_container *c) | |
72d0e1cb SG |
481 | { |
482 | int ret; | |
483 | if (!c) | |
484 | return false; | |
485 | ||
9123e471 | 486 | ret = lxc_unfreeze(c->name, c->config_path); |
72d0e1cb SG |
487 | if (ret) |
488 | return false; | |
489 | return true; | |
490 | } | |
491 | ||
858377e4 SH |
492 | WRAP_API(bool, lxcapi_unfreeze) |
493 | ||
494 | static int do_lxcapi_console_getfd(struct lxc_container *c, int *ttynum, int *masterfd) | |
0115f8fd DE |
495 | { |
496 | int ttyfd; | |
497 | if (!c) | |
498 | return -1; | |
499 | ||
b5159817 | 500 | ttyfd = lxc_console_getfd(c, ttynum, masterfd); |
0115f8fd DE |
501 | return ttyfd; |
502 | } | |
503 | ||
858377e4 SH |
504 | WRAP_API_2(int, lxcapi_console_getfd, int *, int *) |
505 | ||
b5159817 DE |
506 | static int lxcapi_console(struct lxc_container *c, int ttynum, int stdinfd, |
507 | int stdoutfd, int stderrfd, int escape) | |
508 | { | |
858377e4 SH |
509 | int ret; |
510 | ||
511 | if (!c) | |
512 | return -1; | |
513 | ||
514 | current_config = c->lxc_conf; | |
515 | ret = lxc_console(c, ttynum, stdinfd, stdoutfd, stderrfd, escape); | |
516 | current_config = NULL; | |
517 | return ret; | |
b5159817 DE |
518 | } |
519 | ||
191d43cc CB |
520 | static int do_lxcapi_console_log(struct lxc_container *c, struct lxc_console_log *log) |
521 | { | |
522 | int ret; | |
523 | ||
524 | ret = lxc_cmd_console_log(c->name, do_lxcapi_get_config_path(c), log); | |
525 | if (ret < 0) { | |
526 | if (ret == -ENODATA) | |
63b74cda | 527 | NOTICE("The console log is empty"); |
191d43cc | 528 | else if (ret == -EFAULT) |
63b74cda CB |
529 | NOTICE("The container does not keep a console log"); |
530 | else if (ret == -ENOENT) | |
531 | NOTICE("The container does not keep a console log file"); | |
532 | else if (ret == -EIO) | |
533 | NOTICE("Failed to write console log to log file"); | |
191d43cc | 534 | else |
63b74cda | 535 | ERROR("Failed to retrieve console log"); |
191d43cc CB |
536 | } |
537 | ||
538 | return ret; | |
539 | } | |
540 | ||
541 | WRAP_API_1(int, lxcapi_console_log, struct lxc_console_log *) | |
542 | ||
858377e4 | 543 | static pid_t do_lxcapi_init_pid(struct lxc_container *c) |
72d0e1cb | 544 | { |
72d0e1cb SG |
545 | if (!c) |
546 | return -1; | |
547 | ||
5cee8c50 | 548 | return lxc_cmd_get_init_pid(c->name, c->config_path); |
72d0e1cb SG |
549 | } |
550 | ||
858377e4 SH |
551 | WRAP_API(pid_t, lxcapi_init_pid) |
552 | ||
12a50cc6 | 553 | static bool load_config_locked(struct lxc_container *c, const char *fname) |
8eb5694b SH |
554 | { |
555 | if (!c->lxc_conf) | |
556 | c->lxc_conf = lxc_conf_init(); | |
6b0d5538 SH |
557 | if (!c->lxc_conf) |
558 | return false; | |
d08779d4 SH |
559 | if (lxc_config_read(fname, c->lxc_conf, false) != 0) |
560 | return false; | |
d08779d4 | 561 | return true; |
8eb5694b SH |
562 | } |
563 | ||
858377e4 | 564 | static bool do_lxcapi_load_config(struct lxc_container *c, const char *alt_file) |
72d0e1cb | 565 | { |
39dc698c SH |
566 | bool ret = false, need_disklock = false; |
567 | int lret; | |
12a50cc6 | 568 | const char *fname; |
72d0e1cb SG |
569 | if (!c) |
570 | return false; | |
571 | ||
572 | fname = c->configfile; | |
573 | if (alt_file) | |
574 | fname = alt_file; | |
575 | if (!fname) | |
576 | return false; | |
39dc698c SH |
577 | /* |
578 | * If we're reading something other than the container's config, | |
579 | * we only need to lock the in-memory container. If loading the | |
580 | * container's config file, take the disk lock. | |
581 | */ | |
582 | if (strcmp(fname, c->configfile) == 0) | |
583 | need_disklock = true; | |
584 | ||
585 | if (need_disklock) | |
586 | lret = container_disk_lock(c); | |
587 | else | |
588 | lret = container_mem_lock(c); | |
589 | if (lret) | |
72d0e1cb | 590 | return false; |
39dc698c | 591 | |
8eb5694b | 592 | ret = load_config_locked(c, fname); |
39dc698c SH |
593 | |
594 | if (need_disklock) | |
595 | container_disk_unlock(c); | |
596 | else | |
597 | container_mem_unlock(c); | |
72d0e1cb SG |
598 | return ret; |
599 | } | |
600 | ||
858377e4 SH |
601 | WRAP_API_1(bool, lxcapi_load_config, const char *) |
602 | ||
603 | static bool do_lxcapi_want_daemonize(struct lxc_container *c, bool state) | |
72d0e1cb | 604 | { |
497a2995 | 605 | if (!c || !c->lxc_conf) |
540f932a | 606 | return false; |
f02abefe | 607 | if (container_mem_lock(c)) { |
3bc449ed | 608 | ERROR("Error getting mem lock"); |
540f932a | 609 | return false; |
3bc449ed | 610 | } |
a2739df5 | 611 | c->daemonize = state; |
3bc449ed | 612 | container_mem_unlock(c); |
540f932a | 613 | return true; |
72d0e1cb SG |
614 | } |
615 | ||
858377e4 SH |
616 | WRAP_API_1(bool, lxcapi_want_daemonize, bool) |
617 | ||
618 | static bool do_lxcapi_want_close_all_fds(struct lxc_container *c, bool state) | |
130a1888 ÇO |
619 | { |
620 | if (!c || !c->lxc_conf) | |
49badbbe | 621 | return false; |
130a1888 ÇO |
622 | if (container_mem_lock(c)) { |
623 | ERROR("Error getting mem lock"); | |
49badbbe | 624 | return false; |
130a1888 | 625 | } |
540f932a | 626 | c->lxc_conf->close_all_fds = state; |
130a1888 | 627 | container_mem_unlock(c); |
49badbbe | 628 | return true; |
130a1888 ÇO |
629 | } |
630 | ||
858377e4 SH |
631 | WRAP_API_1(bool, lxcapi_want_close_all_fds, bool) |
632 | ||
633 | static bool do_lxcapi_wait(struct lxc_container *c, const char *state, int timeout) | |
7a44c8b4 SG |
634 | { |
635 | int ret; | |
636 | ||
637 | if (!c) | |
638 | return false; | |
639 | ||
67e571de | 640 | ret = lxc_wait(c->name, state, timeout, c->config_path); |
7a44c8b4 SG |
641 | return ret == 0; |
642 | } | |
643 | ||
858377e4 | 644 | WRAP_API_2(bool, lxcapi_wait, const char *, int) |
7a44c8b4 | 645 | |
2d834aa8 SH |
646 | static bool am_single_threaded(void) |
647 | { | |
74f96976 | 648 | struct dirent *direntp; |
2d834aa8 SH |
649 | DIR *dir; |
650 | int count=0; | |
651 | ||
2d834aa8 | 652 | dir = opendir("/proc/self/task"); |
2d834aa8 SH |
653 | if (!dir) { |
654 | INFO("failed to open /proc/self/task"); | |
655 | return false; | |
656 | } | |
657 | ||
74f96976 | 658 | while ((direntp = readdir(dir))) { |
2d834aa8 SH |
659 | if (!strcmp(direntp->d_name, ".")) |
660 | continue; | |
661 | ||
662 | if (!strcmp(direntp->d_name, "..")) | |
663 | continue; | |
664 | if (++count > 1) | |
665 | break; | |
666 | } | |
2d834aa8 | 667 | closedir(dir); |
2d834aa8 SH |
668 | return count == 1; |
669 | } | |
670 | ||
fd51a89b SH |
671 | static void push_arg(char ***argp, char *arg, int *nargs) |
672 | { | |
673 | char **argv; | |
674 | char *copy; | |
675 | ||
676 | do { | |
677 | copy = strdup(arg); | |
678 | } while (!copy); | |
679 | do { | |
680 | argv = realloc(*argp, (*nargs + 2) * sizeof(char *)); | |
681 | } while (!argv); | |
682 | *argp = argv; | |
683 | argv[*nargs] = copy; | |
684 | (*nargs)++; | |
685 | argv[*nargs] = NULL; | |
686 | } | |
687 | ||
688 | static char **split_init_cmd(const char *incmd) | |
689 | { | |
690 | size_t len; | |
691 | int nargs = 0; | |
5590a671 | 692 | char *copy, *p, *saveptr = NULL; |
fd51a89b SH |
693 | char **argv; |
694 | ||
695 | if (!incmd) | |
696 | return NULL; | |
697 | ||
698 | len = strlen(incmd) + 1; | |
699 | copy = alloca(len); | |
700 | strncpy(copy, incmd, len); | |
701 | copy[len-1] = '\0'; | |
702 | ||
703 | do { | |
704 | argv = malloc(sizeof(char *)); | |
705 | } while (!argv); | |
706 | argv[0] = NULL; | |
707 | for (p = strtok_r(copy, " ", &saveptr); p != NULL; | |
708 | p = strtok_r(NULL, " ", &saveptr)) | |
709 | push_arg(&argv, p, &nargs); | |
710 | ||
711 | if (nargs == 0) { | |
712 | free(argv); | |
713 | return NULL; | |
714 | } | |
715 | return argv; | |
716 | } | |
717 | ||
718 | static void free_init_cmd(char **argv) | |
719 | { | |
720 | int i = 0; | |
721 | ||
722 | if (!argv) | |
723 | return; | |
724 | while (argv[i]) | |
725 | free(argv[i++]); | |
726 | free(argv); | |
727 | } | |
728 | ||
5e5576a4 CB |
729 | static int lxc_rcv_status(int state_socket) |
730 | { | |
731 | int ret; | |
ee8377bd | 732 | int state = -1; |
5e5576a4 | 733 | |
ee8377bd | 734 | again: |
5e5576a4 CB |
735 | /* Receive container state. */ |
736 | ret = lxc_abstract_unix_rcv_credential(state_socket, &state, | |
ee8377bd CB |
737 | sizeof(int)); |
738 | if (ret <= 0) { | |
739 | if (errno != EINTR) | |
740 | return -1; | |
741 | TRACE("Caught EINTR; retrying"); | |
742 | goto again; | |
743 | } | |
5e5576a4 CB |
744 | |
745 | return state; | |
746 | } | |
747 | ||
748 | static bool wait_on_daemonized_start(struct lxc_handler *handler, int pid) | |
749 | { | |
01c1b11e | 750 | int ret, state; |
5e5576a4 CB |
751 | |
752 | /* Close write end of the socket pair. */ | |
753 | close(handler->state_socket_pair[1]); | |
754 | handler->state_socket_pair[1] = -1; | |
755 | ||
756 | state = lxc_rcv_status(handler->state_socket_pair[0]); | |
757 | ||
758 | /* Close read end of the socket pair. */ | |
759 | close(handler->state_socket_pair[0]); | |
760 | handler->state_socket_pair[0] = -1; | |
761 | ||
762 | /* The first child is going to fork() again and then exits. So we reap | |
763 | * the first child here. | |
764 | */ | |
01c1b11e CB |
765 | ret = wait_for_pid(pid); |
766 | if (ret < 0) | |
767 | DEBUG("Failed waiting on first child %d", pid); | |
768 | else | |
769 | DEBUG("First child %d exited", pid); | |
5e5576a4 CB |
770 | |
771 | if (state < 0) { | |
772 | SYSERROR("Failed to receive the container state"); | |
773 | return false; | |
774 | } | |
775 | ||
776 | /* If we receive anything else then running we know that the container | |
777 | * failed to start. | |
778 | */ | |
779 | if (state != RUNNING) { | |
780 | ERROR("Received container state \"%s\" instead of \"RUNNING\"", | |
781 | lxc_state2str(state)); | |
782 | return false; | |
783 | } | |
784 | ||
785 | TRACE("Container is in \"RUNNING\" state"); | |
786 | return true; | |
787 | } | |
788 | ||
858377e4 | 789 | static bool do_lxcapi_start(struct lxc_container *c, int useinit, char * const argv[]) |
72d0e1cb SG |
790 | { |
791 | int ret; | |
aa460476 | 792 | struct lxc_handler *handler; |
72d0e1cb | 793 | struct lxc_conf *conf; |
540f932a | 794 | bool daemonize = false; |
6eaac303 | 795 | FILE *pid_fp = NULL; |
72d0e1cb SG |
796 | char *default_args[] = { |
797 | "/sbin/init", | |
13aad0ae | 798 | NULL, |
72d0e1cb | 799 | }; |
fd51a89b | 800 | char **init_cmd = NULL; |
c1a3e547 | 801 | int keepfds[3] = {-1, -1, -1}; |
72d0e1cb | 802 | |
7cb19d44 | 803 | /* container does exist */ |
72d0e1cb SG |
804 | if (!c) |
805 | return false; | |
120146b9 | 806 | |
7cb19d44 CB |
807 | /* If anything fails before we set error_num, we want an error in there. |
808 | */ | |
120146b9 SG |
809 | c->error_num = 1; |
810 | ||
7cb19d44 | 811 | /* Container has not been setup. */ |
72d0e1cb SG |
812 | if (!c->lxc_conf) |
813 | return false; | |
814 | ||
c47eafec CB |
815 | ret = ongoing_create(c); |
816 | if (ret < 0) { | |
7cb19d44 | 817 | ERROR("Failed checking for incomplete container creation"); |
3e625e2d | 818 | return false; |
3e625e2d | 819 | } else if (ret == 1) { |
7cb19d44 | 820 | ERROR("Ongoing container creation detected"); |
3e625e2d | 821 | return false; |
c47eafec | 822 | } else if (ret == 2) { |
7cb19d44 | 823 | ERROR("Failed to create container"); |
c47eafec CB |
824 | do_lxcapi_destroy(c); |
825 | return false; | |
3e625e2d SH |
826 | } |
827 | ||
5cee8c50 | 828 | if (container_mem_lock(c)) |
72d0e1cb SG |
829 | return false; |
830 | conf = c->lxc_conf; | |
831 | daemonize = c->daemonize; | |
72d0e1cb | 832 | |
aa460476 | 833 | /* initialize handler */ |
5e5576a4 | 834 | handler = lxc_init_handler(c->name, conf, c->config_path, daemonize); |
dbc9832d | 835 | container_mem_unlock(c); |
aa460476 CB |
836 | if (!handler) |
837 | return false; | |
838 | ||
fa30091b CB |
839 | if (!argv) { |
840 | if (useinit && conf->execute_cmd) | |
841 | argv = init_cmd = split_init_cmd(conf->execute_cmd); | |
842 | else | |
843 | argv = init_cmd = split_init_cmd(conf->init_cmd); | |
844 | } | |
fd51a89b | 845 | |
7cb19d44 | 846 | /* ... otherwise use default_args. */ |
fa30091b | 847 | if (!argv) { |
e1e76423 CB |
848 | if (useinit) { |
849 | ERROR("No valid init detected"); | |
850 | lxc_free_handler(handler); | |
fa30091b | 851 | return false; |
e1e76423 CB |
852 | } |
853 | argv = default_args; | |
fa30091b | 854 | } |
72d0e1cb | 855 | |
7cb19d44 CB |
856 | /* I'm not sure what locks we want here.Any? Is liblxc's locking enough |
857 | * here to protect the on disk container? We don't want to exclude | |
858 | * things like lxc_info while the container is running. | |
859 | */ | |
72d0e1cb | 860 | if (daemonize) { |
a6b6ad7b | 861 | bool started; |
0a4be28d | 862 | char title[2048]; |
c47eafec | 863 | pid_t pid; |
71454076 | 864 | |
c47eafec | 865 | pid = fork(); |
f2e07cb6 | 866 | if (pid < 0) { |
c47eafec | 867 | free_init_cmd(init_cmd); |
f2e07cb6 | 868 | lxc_free_handler(handler); |
72d0e1cb | 869 | return false; |
f2e07cb6 | 870 | } |
6eaac303 | 871 | |
7cb19d44 | 872 | /* first parent */ |
6eaac303 QH |
873 | if (pid != 0) { |
874 | /* Set to NULL because we don't want father unlink | |
875 | * the PID file, child will do the free and unlink. | |
876 | */ | |
877 | c->pidfile = NULL; | |
5e5576a4 | 878 | |
7cb19d44 CB |
879 | /* Wait for container to tell us whether it started |
880 | * successfully. | |
881 | */ | |
a6b6ad7b CB |
882 | started = wait_on_daemonized_start(handler, pid); |
883 | ||
884 | free_init_cmd(init_cmd); | |
885 | lxc_free_handler(handler); | |
886 | return started; | |
6eaac303 | 887 | } |
025ed0f3 | 888 | |
7cb19d44 CB |
889 | /* first child */ |
890 | ||
0a4be28d | 891 | /* We don't really care if this doesn't print all the |
7cb19d44 CB |
892 | * characters. All that it means is that the proctitle will be |
893 | * ugly. Similarly, we also don't care if setproctitle() fails. | |
894 | * */ | |
0a4be28d TA |
895 | snprintf(title, sizeof(title), "[lxc monitor] %s %s", c->config_path, c->name); |
896 | INFO("Attempting to set proc title to %s", title); | |
897 | setproctitle(title); | |
898 | ||
7cb19d44 CB |
899 | /* We fork() a second time to be reparented to init. Like |
900 | * POSIX's daemon() function we change to "/" and redirect | |
901 | * std{in,out,err} to /dev/null. | |
902 | */ | |
697fa639 SH |
903 | pid = fork(); |
904 | if (pid < 0) { | |
7cb19d44 | 905 | SYSERROR("Failed to fork first child process"); |
d608fbda | 906 | _exit(EXIT_FAILURE); |
697fa639 | 907 | } |
a6b6ad7b | 908 | |
7cb19d44 | 909 | /* second parent */ |
a6b6ad7b CB |
910 | if (pid != 0) { |
911 | free_init_cmd(init_cmd); | |
912 | lxc_free_handler(handler); | |
d608fbda | 913 | _exit(EXIT_SUCCESS); |
a6b6ad7b CB |
914 | } |
915 | ||
7cb19d44 CB |
916 | /* second child */ |
917 | ||
918 | /* change to / directory */ | |
919 | ret = chdir("/"); | |
920 | if (ret < 0) { | |
921 | SYSERROR("Failed to change to \"/\" directory"); | |
d608fbda | 922 | _exit(EXIT_FAILURE); |
c278cef2 | 923 | } |
7cb19d44 | 924 | |
c1a3e547 CB |
925 | keepfds[0] = handler->conf->maincmd_fd; |
926 | keepfds[1] = handler->state_socket_pair[0]; | |
927 | keepfds[2] = handler->state_socket_pair[1]; | |
928 | ret = lxc_check_inherited(conf, true, keepfds, | |
929 | sizeof(keepfds) / sizeof(keepfds[0])); | |
7cb19d44 | 930 | if (ret < 0) |
d608fbda | 931 | _exit(EXIT_FAILURE); |
7cb19d44 CB |
932 | |
933 | /* redirect std{in,out,err} to /dev/null */ | |
934 | ret = null_stdfds(); | |
935 | if (ret < 0) { | |
936 | ERROR("Failed to redirect std{in,out,err} to /dev/null"); | |
d608fbda | 937 | _exit(EXIT_FAILURE); |
69aeabac | 938 | } |
7cb19d44 CB |
939 | |
940 | /* become session leader */ | |
941 | ret = setsid(); | |
942 | if (ret < 0) | |
0059379f | 943 | TRACE("Process %d is already process group leader", lxc_raw_getpid()); |
2d834aa8 SH |
944 | } else { |
945 | if (!am_single_threaded()) { | |
946 | ERROR("Cannot start non-daemonized container when threaded"); | |
a6b6ad7b | 947 | free_init_cmd(init_cmd); |
f2e07cb6 | 948 | lxc_free_handler(handler); |
2d834aa8 SH |
949 | return false; |
950 | } | |
72d0e1cb SG |
951 | } |
952 | ||
aa460476 | 953 | /* We need to write PID file after daemonize, so we always |
6eaac303 QH |
954 | * write the right PID. |
955 | */ | |
956 | if (c->pidfile) { | |
957 | pid_fp = fopen(c->pidfile, "w"); | |
958 | if (pid_fp == NULL) { | |
959 | SYSERROR("Failed to create pidfile '%s' for '%s'", | |
960 | c->pidfile, c->name); | |
c47eafec | 961 | free_init_cmd(init_cmd); |
f2e07cb6 | 962 | lxc_free_handler(handler); |
13353dc4 | 963 | if (daemonize) |
d608fbda | 964 | _exit(EXIT_FAILURE); |
6eaac303 QH |
965 | return false; |
966 | } | |
967 | ||
0059379f | 968 | if (fprintf(pid_fp, "%d\n", lxc_raw_getpid()) < 0) { |
6eaac303 QH |
969 | SYSERROR("Failed to write '%s'", c->pidfile); |
970 | fclose(pid_fp); | |
971 | pid_fp = NULL; | |
c47eafec | 972 | free_init_cmd(init_cmd); |
f2e07cb6 | 973 | lxc_free_handler(handler); |
13353dc4 | 974 | if (daemonize) |
d608fbda | 975 | _exit(EXIT_FAILURE); |
6eaac303 QH |
976 | return false; |
977 | } | |
978 | ||
979 | fclose(pid_fp); | |
980 | pid_fp = NULL; | |
981 | } | |
982 | ||
72d0e1cb | 983 | conf->reboot = 0; |
d2cf4c37 | 984 | |
a8dfe4e0 WB |
985 | /* Unshare the mount namespace if requested */ |
986 | if (conf->monitor_unshare) { | |
7cb19d44 CB |
987 | ret = unshare(CLONE_NEWNS); |
988 | if (ret < 0) { | |
a8dfe4e0 | 989 | SYSERROR("failed to unshare mount namespace"); |
f2e07cb6 | 990 | lxc_free_handler(handler); |
a6b6ad7b | 991 | ret = 1; |
7cb19d44 | 992 | goto on_error; |
a8dfe4e0 | 993 | } |
7cb19d44 CB |
994 | |
995 | ret = mount(NULL, "/", NULL, MS_SLAVE|MS_REC, NULL); | |
996 | if (ret < 0) { | |
a8dfe4e0 | 997 | SYSERROR("Failed to make / rslave at startup"); |
f2e07cb6 | 998 | lxc_free_handler(handler); |
a6b6ad7b | 999 | ret = 1; |
7cb19d44 | 1000 | goto on_error; |
a8dfe4e0 WB |
1001 | } |
1002 | } | |
1003 | ||
8bee8851 | 1004 | reboot: |
aa460476 CB |
1005 | if (conf->reboot == 2) { |
1006 | /* initialize handler */ | |
5e5576a4 | 1007 | handler = lxc_init_handler(c->name, conf, c->config_path, daemonize); |
a6b6ad7b CB |
1008 | if (!handler) { |
1009 | ret = 1; | |
7cb19d44 | 1010 | goto on_error; |
a6b6ad7b | 1011 | } |
aa460476 CB |
1012 | } |
1013 | ||
c1a3e547 CB |
1014 | keepfds[0] = handler->conf->maincmd_fd; |
1015 | keepfds[1] = handler->state_socket_pair[0]; | |
1016 | keepfds[2] = handler->state_socket_pair[1]; | |
1017 | ret = lxc_check_inherited(conf, daemonize, keepfds, | |
1018 | sizeof(keepfds) / sizeof(keepfds[0])); | |
7cb19d44 | 1019 | if (ret < 0) { |
f2e07cb6 | 1020 | lxc_free_handler(handler); |
d2cf4c37 | 1021 | ret = 1; |
7cb19d44 | 1022 | goto on_error; |
d2cf4c37 SH |
1023 | } |
1024 | ||
9605460f CB |
1025 | if (useinit) |
1026 | ret = lxc_execute(c->name, argv, 1, handler, c->config_path, daemonize); | |
1027 | else | |
1028 | ret = lxc_start(c->name, argv, handler, c->config_path, daemonize); | |
cd5177e9 | 1029 | c->error_num = handler->exit_status; |
72d0e1cb | 1030 | |
8bee8851 | 1031 | if (conf->reboot == 1) { |
7cb19d44 | 1032 | INFO("Container requested reboot"); |
8bee8851 | 1033 | conf->reboot = 2; |
72d0e1cb SG |
1034 | goto reboot; |
1035 | } | |
1036 | ||
7cb19d44 | 1037 | on_error: |
487d8008 QH |
1038 | if (c->pidfile) { |
1039 | unlink(c->pidfile); | |
1040 | free(c->pidfile); | |
1041 | c->pidfile = NULL; | |
1042 | } | |
fd51a89b SH |
1043 | free_init_cmd(init_cmd); |
1044 | ||
7cb19d44 | 1045 | if (daemonize && ret != 0) |
d608fbda | 1046 | _exit(EXIT_FAILURE); |
7cb19d44 | 1047 | else if (daemonize) |
d608fbda | 1048 | _exit(EXIT_SUCCESS); |
7cb19d44 CB |
1049 | |
1050 | if (ret != 0) | |
1051 | return false; | |
1052 | ||
1053 | return true; | |
72d0e1cb SG |
1054 | } |
1055 | ||
858377e4 SH |
1056 | static bool lxcapi_start(struct lxc_container *c, int useinit, char * const argv[]) |
1057 | { | |
1058 | bool ret; | |
1059 | current_config = c ? c->lxc_conf : NULL; | |
1060 | ret = do_lxcapi_start(c, useinit, argv); | |
1061 | current_config = NULL; | |
1062 | return ret; | |
1063 | } | |
1064 | ||
72d0e1cb SG |
1065 | /* |
1066 | * note there MUST be an ending NULL | |
1067 | */ | |
1068 | static bool lxcapi_startl(struct lxc_container *c, int useinit, ...) | |
1069 | { | |
1070 | va_list ap; | |
a0e93eeb | 1071 | char **inargs = NULL; |
72d0e1cb SG |
1072 | bool bret = false; |
1073 | ||
1074 | /* container exists */ | |
1075 | if (!c) | |
1076 | return false; | |
1077 | ||
858377e4 SH |
1078 | current_config = c->lxc_conf; |
1079 | ||
72d0e1cb | 1080 | va_start(ap, useinit); |
a0e93eeb | 1081 | inargs = lxc_va_arg_list_to_argv(ap, 0, 1); |
72d0e1cb SG |
1082 | va_end(ap); |
1083 | ||
a0e93eeb CS |
1084 | if (!inargs) { |
1085 | ERROR("Memory allocation error."); | |
1086 | goto out; | |
72d0e1cb SG |
1087 | } |
1088 | ||
a0e93eeb | 1089 | /* pass NULL if no arguments were supplied */ |
858377e4 | 1090 | bret = do_lxcapi_start(c, useinit, *inargs ? inargs : NULL); |
72d0e1cb SG |
1091 | |
1092 | out: | |
1093 | if (inargs) { | |
4e03ae57 DE |
1094 | char **arg; |
1095 | for (arg = inargs; *arg; arg++) | |
1096 | free(*arg); | |
72d0e1cb SG |
1097 | free(inargs); |
1098 | } | |
1099 | ||
858377e4 | 1100 | current_config = NULL; |
72d0e1cb SG |
1101 | return bret; |
1102 | } | |
1103 | ||
858377e4 | 1104 | static bool do_lxcapi_stop(struct lxc_container *c) |
72d0e1cb SG |
1105 | { |
1106 | int ret; | |
1107 | ||
1108 | if (!c) | |
1109 | return false; | |
1110 | ||
ef6e34ee | 1111 | ret = lxc_cmd_stop(c->name, c->config_path); |
72d0e1cb | 1112 | |
d775f21b | 1113 | return ret == 0; |
72d0e1cb SG |
1114 | } |
1115 | ||
858377e4 SH |
1116 | WRAP_API(bool, lxcapi_stop) |
1117 | ||
d5752559 SH |
1118 | static int do_create_container_dir(const char *path, struct lxc_conf *conf) |
1119 | { | |
1120 | int ret = -1, lasterr; | |
1121 | char *p = alloca(strlen(path)+1); | |
1122 | mode_t mask = umask(0002); | |
1123 | ret = mkdir(path, 0770); | |
1124 | lasterr = errno; | |
1125 | umask(mask); | |
1126 | errno = lasterr; | |
1127 | if (ret) { | |
1128 | if (errno == EEXIST) | |
1129 | ret = 0; | |
1130 | else { | |
1131 | SYSERROR("failed to create container path %s", path); | |
1132 | return -1; | |
1133 | } | |
1134 | } | |
1135 | strcpy(p, path); | |
1136 | if (!lxc_list_empty(&conf->id_map) && chown_mapped_root(p, conf) != 0) { | |
1137 | ERROR("Failed to chown container dir"); | |
1138 | ret = -1; | |
1139 | } | |
1140 | return ret; | |
1141 | } | |
1142 | ||
72d0e1cb SG |
1143 | /* |
1144 | * create the standard expected container dir | |
1145 | */ | |
1146 | static bool create_container_dir(struct lxc_container *c) | |
1147 | { | |
1148 | char *s; | |
1149 | int len, ret; | |
1150 | ||
2a59a681 | 1151 | len = strlen(c->config_path) + strlen(c->name) + 2; |
72d0e1cb SG |
1152 | s = malloc(len); |
1153 | if (!s) | |
1154 | return false; | |
2a59a681 | 1155 | ret = snprintf(s, len, "%s/%s", c->config_path, c->name); |
72d0e1cb SG |
1156 | if (ret < 0 || ret >= len) { |
1157 | free(s); | |
1158 | return false; | |
1159 | } | |
d5752559 | 1160 | ret = do_create_container_dir(s, c->lxc_conf); |
72d0e1cb SG |
1161 | free(s); |
1162 | return ret == 0; | |
1163 | } | |
1164 | ||
10bc1861 CB |
1165 | /* do_storage_create: thin wrapper around storage_create(). Like |
1166 | * storage_create(), it returns a mounted bdev on success, NULL on error. | |
72d0e1cb | 1167 | */ |
10bc1861 CB |
1168 | static struct lxc_storage *do_storage_create(struct lxc_container *c, |
1169 | const char *type, | |
1170 | struct bdev_specs *specs) | |
1897e3bc | 1171 | { |
e9e29a33 | 1172 | int ret; |
1897e3bc | 1173 | size_t len; |
e9e29a33 | 1174 | char *dest; |
10bc1861 | 1175 | struct lxc_storage *bdev; |
1897e3bc | 1176 | |
cd219ae6 | 1177 | /* rootfs.path or lxcpath/lxcname/rootfs */ |
e9e29a33 CB |
1178 | if (c->lxc_conf->rootfs.path && |
1179 | (access(c->lxc_conf->rootfs.path, F_OK) == 0)) { | |
cf465fe4 SH |
1180 | const char *rpath = c->lxc_conf->rootfs.path; |
1181 | len = strlen(rpath) + 1; | |
cd219ae6 | 1182 | dest = alloca(len); |
cf465fe4 | 1183 | ret = snprintf(dest, len, "%s", rpath); |
cd219ae6 | 1184 | } else { |
858377e4 | 1185 | const char *lxcpath = do_lxcapi_get_config_path(c); |
cd219ae6 SY |
1186 | len = strlen(c->name) + strlen(lxcpath) + 9; |
1187 | dest = alloca(len); | |
1188 | ret = snprintf(dest, len, "%s/%s/rootfs", lxcpath, c->name); | |
1189 | } | |
e9e29a33 | 1190 | if (ret < 0 || (size_t)ret >= len) |
1897e3bc SH |
1191 | return NULL; |
1192 | ||
10bc1861 | 1193 | bdev = storage_create(dest, type, c->name, specs); |
d44e88c2 | 1194 | if (!bdev) { |
e9e29a33 | 1195 | ERROR("Failed to create \"%s\" storage", type); |
1897e3bc | 1196 | return NULL; |
d44e88c2 SH |
1197 | } |
1198 | ||
7a96a068 | 1199 | if (!c->set_config_item(c, "lxc.rootfs.path", bdev->src)) { |
e9e29a33 | 1200 | ERROR("Failed to set \"lxc.rootfs.path = %s\"", bdev->src); |
f7ac4459 CB |
1201 | return NULL; |
1202 | } | |
cf3ef16d | 1203 | |
e9e29a33 CB |
1204 | /* If we are not root, chown the rootfs dir to root in the target user |
1205 | * namespace. | |
f7ac4459 | 1206 | */ |
e9e29a33 CB |
1207 | ret = geteuid(); |
1208 | if (ret != 0 || (c->lxc_conf && !lxc_list_empty(&c->lxc_conf->id_map))) { | |
1209 | ret = chown_mapped_root(bdev->dest, c->lxc_conf); | |
1210 | if (ret < 0) { | |
1211 | ERROR("Error chowning \"%s\" to container root", bdev->dest); | |
97e9cfa0 | 1212 | suggest_default_idmap(); |
10bc1861 | 1213 | storage_put(bdev); |
cf3ef16d SH |
1214 | return NULL; |
1215 | } | |
1216 | } | |
1217 | ||
1897e3bc SH |
1218 | return bdev; |
1219 | } | |
1220 | ||
96b3cb40 | 1221 | static char *lxcbasename(char *path) |
72d0e1cb | 1222 | { |
96b3cb40 SH |
1223 | char *p = path + strlen(path) - 1; |
1224 | while (*p != '/' && p > path) | |
1225 | p--; | |
1226 | return p; | |
1227 | } | |
72d0e1cb | 1228 | |
69aeabac | 1229 | static bool create_run_template(struct lxc_container *c, char *tpath, bool need_null_stdfds, |
96b3cb40 SH |
1230 | char *const argv[]) |
1231 | { | |
1232 | pid_t pid; | |
72d0e1cb | 1233 | |
72d0e1cb | 1234 | if (!tpath) |
96b3cb40 | 1235 | return true; |
72d0e1cb SG |
1236 | |
1237 | pid = fork(); | |
1238 | if (pid < 0) { | |
7e34710e | 1239 | SYSERROR("Failed to fork task for container creation template"); |
96b3cb40 | 1240 | return false; |
72d0e1cb SG |
1241 | } |
1242 | ||
1a0e70ac | 1243 | if (pid == 0) { /* child */ |
39460be8 | 1244 | char *patharg, *namearg, *rootfsarg; |
10bc1861 | 1245 | struct lxc_storage *bdev = NULL; |
72d0e1cb | 1246 | int i; |
96b3cb40 SH |
1247 | int ret, len, nargs = 0; |
1248 | char **newargv; | |
cf3ef16d | 1249 | struct lxc_conf *conf = c->lxc_conf; |
72d0e1cb | 1250 | |
69aeabac | 1251 | if (need_null_stdfds && null_stdfds() < 0) { |
7e34710e | 1252 | _exit(EXIT_FAILURE); |
dc23c1c8 | 1253 | } |
1897e3bc | 1254 | |
8a388ed4 | 1255 | bdev = storage_init(c->lxc_conf); |
1897e3bc SH |
1256 | if (!bdev) { |
1257 | ERROR("Error opening rootfs"); | |
7e34710e | 1258 | _exit(EXIT_FAILURE); |
1897e3bc SH |
1259 | } |
1260 | ||
4de2791f | 1261 | if (geteuid() == 0) { |
cf3ef16d SH |
1262 | if (unshare(CLONE_NEWNS) < 0) { |
1263 | ERROR("error unsharing mounts"); | |
7e34710e | 1264 | _exit(EXIT_FAILURE); |
cf3ef16d | 1265 | } |
4de2791f | 1266 | if (detect_shared_rootfs()) { |
c597baa8 | 1267 | if (mount(NULL, "/", NULL, MS_SLAVE|MS_REC, NULL)) { |
4de2791f SH |
1268 | SYSERROR("Failed to make / rslave to run template"); |
1269 | ERROR("Continuing..."); | |
1270 | } | |
1271 | } | |
1272 | } | |
2659c7cb | 1273 | if (strcmp(bdev->type, "dir") && strcmp(bdev->type, "btrfs")) { |
4de2791f | 1274 | if (geteuid() != 0) { |
2659c7cb | 1275 | ERROR("non-root users can only create btrfs and directory-backed containers"); |
eb70aaf0 | 1276 | _exit(EXIT_FAILURE); |
4de2791f | 1277 | } |
241978fa CB |
1278 | |
1279 | if (!strcmp(bdev->type, "overlay") || !strcmp(bdev->type, "overlayfs")) { | |
1280 | /* If we create an overlay container we need to | |
1281 | * rsync the contents into | |
1282 | * <container-path>/<container-name>/rootfs. | |
1283 | * However, the overlay mount function will | |
1284 | * mount will mount | |
1285 | * <container-path>/<container-name>/delta0 | |
1286 | * over | |
1287 | * <container-path>/<container-name>/rootfs | |
1288 | * which means we would rsync the rootfs into | |
1289 | * the delta directory. That doesn't make sense | |
1290 | * since the delta directory only exists to | |
1291 | * record the differences to | |
1292 | * <container-path>/<container-name>/rootfs. So | |
1293 | * let's simply bind-mount here and then rsync | |
1294 | * directly into | |
1295 | * <container-path>/<container-name>/rootfs. | |
1296 | */ | |
1297 | char *src; | |
1298 | ||
1299 | src = ovl_get_rootfs(bdev->src, &(size_t){0}); | |
1300 | if (!src) { | |
1301 | ERROR("Failed to get rootfs"); | |
eb70aaf0 | 1302 | _exit(EXIT_FAILURE); |
241978fa CB |
1303 | } |
1304 | ||
1305 | ret = mount(src, bdev->dest, "bind", MS_BIND | MS_REC, NULL); | |
1306 | if (ret < 0) { | |
1307 | ERROR("Failed to mount rootfs"); | |
1308 | return -1; | |
1309 | } | |
1310 | } else { | |
1311 | if (bdev->ops->mount(bdev) < 0) { | |
1312 | ERROR("Failed to mount rootfs"); | |
eb70aaf0 | 1313 | _exit(EXIT_FAILURE); |
241978fa | 1314 | } |
cf3ef16d | 1315 | } |
1a0e70ac | 1316 | } else { /* TODO come up with a better way here! */ |
41dc7155 | 1317 | const char *src; |
f10fad2f | 1318 | free(bdev->dest); |
e9705550 CB |
1319 | src = lxc_storage_get_path(bdev->src, bdev->type); |
1320 | bdev->dest = strdup(src); | |
1897e3bc SH |
1321 | } |
1322 | ||
72d0e1cb SG |
1323 | /* |
1324 | * create our new array, pre-pend the template name and | |
1325 | * base args | |
1326 | */ | |
1327 | if (argv) | |
1897e3bc | 1328 | for (nargs = 0; argv[nargs]; nargs++) ; |
1a0e70ac | 1329 | nargs += 4; /* template, path, rootfs and name args */ |
cf3ef16d | 1330 | |
72d0e1cb SG |
1331 | newargv = malloc(nargs * sizeof(*newargv)); |
1332 | if (!newargv) | |
7e34710e | 1333 | _exit(EXIT_FAILURE); |
96b3cb40 | 1334 | newargv[0] = lxcbasename(tpath); |
72d0e1cb | 1335 | |
2a59a681 | 1336 | len = strlen(c->config_path) + strlen(c->name) + strlen("--path=") + 2; |
72d0e1cb SG |
1337 | patharg = malloc(len); |
1338 | if (!patharg) | |
7e34710e | 1339 | _exit(EXIT_FAILURE); |
2a59a681 | 1340 | ret = snprintf(patharg, len, "--path=%s/%s", c->config_path, c->name); |
72d0e1cb | 1341 | if (ret < 0 || ret >= len) |
7e34710e | 1342 | _exit(EXIT_FAILURE); |
72d0e1cb SG |
1343 | newargv[1] = patharg; |
1344 | len = strlen("--name=") + strlen(c->name) + 1; | |
1345 | namearg = malloc(len); | |
1346 | if (!namearg) | |
7e34710e | 1347 | _exit(EXIT_FAILURE); |
72d0e1cb SG |
1348 | ret = snprintf(namearg, len, "--name=%s", c->name); |
1349 | if (ret < 0 || ret >= len) | |
7e34710e | 1350 | _exit(EXIT_FAILURE); |
72d0e1cb SG |
1351 | newargv[2] = namearg; |
1352 | ||
1897e3bc SH |
1353 | len = strlen("--rootfs=") + 1 + strlen(bdev->dest); |
1354 | rootfsarg = malloc(len); | |
1355 | if (!rootfsarg) | |
7e34710e | 1356 | _exit(EXIT_FAILURE); |
1897e3bc SH |
1357 | ret = snprintf(rootfsarg, len, "--rootfs=%s", bdev->dest); |
1358 | if (ret < 0 || ret >= len) | |
7e34710e | 1359 | _exit(EXIT_FAILURE); |
1897e3bc SH |
1360 | newargv[3] = rootfsarg; |
1361 | ||
72d0e1cb SG |
1362 | /* add passed-in args */ |
1363 | if (argv) | |
1897e3bc SH |
1364 | for (i = 4; i < nargs; i++) |
1365 | newargv[i] = argv[i-4]; | |
72d0e1cb SG |
1366 | |
1367 | /* add trailing NULL */ | |
1368 | nargs++; | |
1369 | newargv = realloc(newargv, nargs * sizeof(*newargv)); | |
1370 | if (!newargv) | |
7e34710e | 1371 | _exit(EXIT_FAILURE); |
72d0e1cb SG |
1372 | newargv[nargs - 1] = NULL; |
1373 | ||
cf3ef16d SH |
1374 | /* |
1375 | * If we're running the template in a mapped userns, then | |
1376 | * we prepend the template command with: | |
1377 | * lxc-usernsexec <-m map1> ... <-m mapn> -- | |
57d116ab SH |
1378 | * and we append "--mapped-uid x", where x is the mapped uid |
1379 | * for our geteuid() | |
cf3ef16d | 1380 | */ |
0e6e3a41 | 1381 | if (!lxc_list_empty(&conf->id_map)) { |
cf3ef16d | 1382 | int n2args = 1; |
57d116ab | 1383 | char txtuid[20]; |
2133f58c | 1384 | char txtgid[20]; |
cf3ef16d SH |
1385 | char **n2 = malloc(n2args * sizeof(*n2)); |
1386 | struct lxc_list *it; | |
1387 | struct id_map *map; | |
1388 | ||
57d116ab SH |
1389 | if (!n2) { |
1390 | SYSERROR("out of memory"); | |
7e34710e | 1391 | _exit(EXIT_FAILURE); |
57d116ab | 1392 | } |
cf3ef16d SH |
1393 | newargv[0] = tpath; |
1394 | tpath = "lxc-usernsexec"; | |
1395 | n2[0] = "lxc-usernsexec"; | |
1396 | lxc_list_for_each(it, &conf->id_map) { | |
1397 | map = it->elem; | |
1398 | n2args += 2; | |
57d116ab | 1399 | n2 = realloc(n2, n2args * sizeof(char *)); |
cf3ef16d | 1400 | if (!n2) |
7e34710e | 1401 | _exit(EXIT_FAILURE); |
cf3ef16d SH |
1402 | n2[n2args-2] = "-m"; |
1403 | n2[n2args-1] = malloc(200); | |
1404 | if (!n2[n2args-1]) | |
7e34710e | 1405 | _exit(EXIT_FAILURE); |
cf3ef16d SH |
1406 | ret = snprintf(n2[n2args-1], 200, "%c:%lu:%lu:%lu", |
1407 | map->idtype == ID_TYPE_UID ? 'u' : 'g', | |
1408 | map->nsid, map->hostid, map->range); | |
1409 | if (ret < 0 || ret >= 200) | |
7e34710e | 1410 | _exit(EXIT_FAILURE); |
cf3ef16d | 1411 | } |
2133f58c | 1412 | int hostid_mapped = mapped_hostid(geteuid(), conf, ID_TYPE_UID); |
6849cb5b | 1413 | int extraargs = hostid_mapped >= 0 ? 1 : 3; |
57d116ab | 1414 | n2 = realloc(n2, (nargs + n2args + extraargs) * sizeof(char *)); |
cf3ef16d | 1415 | if (!n2) |
7e34710e | 1416 | _exit(EXIT_FAILURE); |
57d116ab | 1417 | if (hostid_mapped < 0) { |
339efad9 | 1418 | hostid_mapped = find_unmapped_nsid(conf, ID_TYPE_UID); |
cf3ef16d | 1419 | n2[n2args++] = "-m"; |
57d116ab | 1420 | if (hostid_mapped < 0) { |
cf3ef16d | 1421 | ERROR("Could not find free uid to map"); |
7e34710e | 1422 | _exit(EXIT_FAILURE); |
cf3ef16d SH |
1423 | } |
1424 | n2[n2args++] = malloc(200); | |
1425 | if (!n2[n2args-1]) { | |
1426 | SYSERROR("out of memory"); | |
7e34710e | 1427 | _exit(EXIT_FAILURE); |
cf3ef16d SH |
1428 | } |
1429 | ret = snprintf(n2[n2args-1], 200, "u:%d:%d:1", | |
57d116ab | 1430 | hostid_mapped, geteuid()); |
cf3ef16d SH |
1431 | if (ret < 0 || ret >= 200) { |
1432 | ERROR("string too long"); | |
7e34710e | 1433 | _exit(EXIT_FAILURE); |
cf3ef16d SH |
1434 | } |
1435 | } | |
2133f58c SH |
1436 | int hostgid_mapped = mapped_hostid(getegid(), conf, ID_TYPE_GID); |
1437 | extraargs = hostgid_mapped >= 0 ? 1 : 3; | |
1438 | n2 = realloc(n2, (nargs + n2args + extraargs) * sizeof(char *)); | |
1439 | if (!n2) | |
7e34710e | 1440 | _exit(EXIT_FAILURE); |
2133f58c | 1441 | if (hostgid_mapped < 0) { |
339efad9 | 1442 | hostgid_mapped = find_unmapped_nsid(conf, ID_TYPE_GID); |
2133f58c SH |
1443 | n2[n2args++] = "-m"; |
1444 | if (hostgid_mapped < 0) { | |
1445 | ERROR("Could not find free uid to map"); | |
7e34710e | 1446 | _exit(EXIT_FAILURE); |
2133f58c SH |
1447 | } |
1448 | n2[n2args++] = malloc(200); | |
1449 | if (!n2[n2args-1]) { | |
1450 | SYSERROR("out of memory"); | |
7e34710e | 1451 | _exit(EXIT_FAILURE); |
2133f58c SH |
1452 | } |
1453 | ret = snprintf(n2[n2args-1], 200, "g:%d:%d:1", | |
1454 | hostgid_mapped, getegid()); | |
1455 | if (ret < 0 || ret >= 200) { | |
1456 | ERROR("string too long"); | |
7e34710e | 1457 | _exit(EXIT_FAILURE); |
2133f58c SH |
1458 | } |
1459 | } | |
cf3ef16d SH |
1460 | n2[n2args++] = "--"; |
1461 | for (i = 0; i < nargs; i++) | |
1462 | n2[i + n2args] = newargv[i]; | |
57d116ab | 1463 | n2args += nargs; |
1a0e70ac CB |
1464 | /* Finally add "--mapped-uid $uid" to tell template |
1465 | * what to chown cached images to. | |
1466 | */ | |
2133f58c | 1467 | n2args += 4; |
57d116ab SH |
1468 | n2 = realloc(n2, n2args * sizeof(char *)); |
1469 | if (!n2) { | |
1470 | SYSERROR("out of memory"); | |
7e34710e | 1471 | _exit(EXIT_FAILURE); |
57d116ab | 1472 | } |
1a0e70ac | 1473 | /* note n2[n2args-1] is NULL */ |
2133f58c | 1474 | n2[n2args-5] = "--mapped-uid"; |
57d116ab | 1475 | snprintf(txtuid, 20, "%d", hostid_mapped); |
2133f58c SH |
1476 | n2[n2args-4] = txtuid; |
1477 | n2[n2args-3] = "--mapped-gid"; | |
1478 | snprintf(txtgid, 20, "%d", hostgid_mapped); | |
1479 | n2[n2args-2] = txtgid; | |
57d116ab | 1480 | n2[n2args-1] = NULL; |
cf3ef16d SH |
1481 | free(newargv); |
1482 | newargv = n2; | |
1483 | } | |
72d0e1cb | 1484 | /* execute */ |
cf3ef16d | 1485 | execvp(tpath, newargv); |
e9705550 | 1486 | SYSERROR("Failed to execute template %s", tpath); |
7e34710e | 1487 | _exit(EXIT_FAILURE); |
72d0e1cb SG |
1488 | } |
1489 | ||
9be53773 | 1490 | if (wait_for_pid(pid) != 0) { |
959aee9c | 1491 | ERROR("container creation template for %s failed", c->name); |
96b3cb40 SH |
1492 | return false; |
1493 | } | |
1494 | ||
1495 | return true; | |
1496 | } | |
1497 | ||
74a3920a | 1498 | static bool prepend_lxc_header(char *path, const char *t, char *const argv[]) |
3ce74686 | 1499 | { |
1fd9bd50 | 1500 | long flen; |
b4569e93 | 1501 | char *contents; |
3ce74686 | 1502 | FILE *f; |
025ed0f3 | 1503 | int ret = -1; |
52026772 | 1504 | #if HAVE_LIBGNUTLS |
025ed0f3 | 1505 | int i; |
3ce74686 | 1506 | unsigned char md_value[SHA_DIGEST_LENGTH]; |
b4569e93 | 1507 | char *tpath; |
52026772 | 1508 | #endif |
3ce74686 | 1509 | |
025ed0f3 | 1510 | f = fopen(path, "r"); |
025ed0f3 | 1511 | if (f == NULL) |
3ce74686 | 1512 | return false; |
025ed0f3 SH |
1513 | |
1514 | if (fseek(f, 0, SEEK_END) < 0) | |
1515 | goto out_error; | |
1516 | if ((flen = ftell(f)) < 0) | |
1517 | goto out_error; | |
1518 | if (fseek(f, 0, SEEK_SET) < 0) | |
1519 | goto out_error; | |
1520 | if ((contents = malloc(flen + 1)) == NULL) | |
1521 | goto out_error; | |
1522 | if (fread(contents, 1, flen, f) != flen) | |
1523 | goto out_free_contents; | |
1524 | ||
3ce74686 | 1525 | contents[flen] = '\0'; |
025ed0f3 | 1526 | ret = fclose(f); |
025ed0f3 SH |
1527 | f = NULL; |
1528 | if (ret < 0) | |
1529 | goto out_free_contents; | |
3ce74686 | 1530 | |
b4569e93 | 1531 | #if HAVE_LIBGNUTLS |
01efd4d3 | 1532 | tpath = get_template_path(t); |
85db5535 | 1533 | if (!tpath) { |
959aee9c | 1534 | ERROR("bad template: %s", t); |
025ed0f3 | 1535 | goto out_free_contents; |
3ce74686 SH |
1536 | } |
1537 | ||
85db5535 DE |
1538 | ret = sha1sum_file(tpath, md_value); |
1539 | if (ret < 0) { | |
1540 | ERROR("Error getting sha1sum of %s", tpath); | |
3ce74686 | 1541 | free(tpath); |
85db5535 | 1542 | goto out_free_contents; |
3ce74686 | 1543 | } |
85db5535 | 1544 | free(tpath); |
3ce74686 SH |
1545 | #endif |
1546 | ||
025ed0f3 | 1547 | f = fopen(path, "w"); |
025ed0f3 | 1548 | if (f == NULL) { |
3ce74686 SH |
1549 | SYSERROR("reopening config for writing"); |
1550 | free(contents); | |
1551 | return false; | |
1552 | } | |
1553 | fprintf(f, "# Template used to create this container: %s\n", t); | |
1554 | if (argv) { | |
1555 | fprintf(f, "# Parameters passed to the template:"); | |
1556 | while (*argv) { | |
1557 | fprintf(f, " %s", *argv); | |
1558 | argv++; | |
1559 | } | |
1560 | fprintf(f, "\n"); | |
1561 | } | |
1562 | #if HAVE_LIBGNUTLS | |
56698177 SH |
1563 | fprintf(f, "# Template script checksum (SHA-1): "); |
1564 | for (i=0; i<SHA_DIGEST_LENGTH; i++) | |
1565 | fprintf(f, "%02x", md_value[i]); | |
1566 | fprintf(f, "\n"); | |
3ce74686 | 1567 | #endif |
0520c252 | 1568 | fprintf(f, "# For additional config options, please look at lxc.container.conf(5)\n"); |
49a2ed80 SH |
1569 | fprintf(f, "\n# Uncomment the following line to support nesting containers:\n"); |
1570 | fprintf(f, "#lxc.include = " LXCTEMPLATECONFIG "/nesting.conf\n"); | |
1571 | fprintf(f, "# (Be aware this has security implications)\n\n"); | |
3ce74686 SH |
1572 | if (fwrite(contents, 1, flen, f) != flen) { |
1573 | SYSERROR("Writing original contents"); | |
1574 | free(contents); | |
1575 | fclose(f); | |
1576 | return false; | |
1577 | } | |
025ed0f3 SH |
1578 | ret = 0; |
1579 | out_free_contents: | |
3ce74686 | 1580 | free(contents); |
025ed0f3 SH |
1581 | out_error: |
1582 | if (f) { | |
1583 | int newret; | |
025ed0f3 | 1584 | newret = fclose(f); |
025ed0f3 SH |
1585 | if (ret == 0) |
1586 | ret = newret; | |
1587 | } | |
1588 | if (ret < 0) { | |
1589 | SYSERROR("Error prepending header"); | |
3ce74686 SH |
1590 | return false; |
1591 | } | |
1592 | return true; | |
1593 | } | |
1594 | ||
4df7f012 SH |
1595 | static void lxcapi_clear_config(struct lxc_container *c) |
1596 | { | |
f979ac15 SH |
1597 | if (c) { |
1598 | if (c->lxc_conf) { | |
1599 | lxc_conf_free(c->lxc_conf); | |
1600 | c->lxc_conf = NULL; | |
1601 | } | |
4df7f012 SH |
1602 | } |
1603 | } | |
1604 | ||
858377e4 SH |
1605 | #define do_lxcapi_clear_config(c) lxcapi_clear_config(c) |
1606 | ||
96b3cb40 SH |
1607 | /* |
1608 | * lxcapi_create: | |
1609 | * create a container with the given parameters. | |
1610 | * @c: container to be created. It has the lxcpath, name, and a starting | |
1611 | * configuration already set | |
1612 | * @t: the template to execute to instantiate the root filesystem and | |
1613 | * adjust the configuration. | |
1614 | * @bdevtype: backing store type to use. If NULL, dir will be used. | |
1615 | * @specs: additional parameters for the backing store, i.e. LVM vg to | |
1616 | * use. | |
1617 | * | |
1618 | * @argv: the arguments to pass to the template, terminated by NULL. If no | |
1619 | * arguments, you can just pass NULL. | |
1620 | */ | |
858377e4 | 1621 | static bool do_lxcapi_create(struct lxc_container *c, const char *t, |
dc23c1c8 | 1622 | const char *bdevtype, struct bdev_specs *specs, int flags, |
96b3cb40 SH |
1623 | char *const argv[]) |
1624 | { | |
e9e29a33 | 1625 | int partial_fd; |
96b3cb40 | 1626 | pid_t pid; |
e9e29a33 | 1627 | bool ret = false; |
85db5535 | 1628 | char *tpath = NULL; |
96b3cb40 SH |
1629 | |
1630 | if (!c) | |
1631 | return false; | |
1632 | ||
85db5535 DE |
1633 | if (t) { |
1634 | tpath = get_template_path(t); | |
1635 | if (!tpath) { | |
e9e29a33 | 1636 | ERROR("Unknown template \"%s\"", t); |
85db5535 DE |
1637 | goto out; |
1638 | } | |
96b3cb40 SH |
1639 | } |
1640 | ||
e9e29a33 CB |
1641 | /* If a template is passed in, and the rootfs already is defined in the |
1642 | * container config and exists, then the caller is trying to create an | |
1643 | * existing container. Return an error, but do NOT delete the container. | |
cf465fe4 | 1644 | */ |
858377e4 | 1645 | if (do_lxcapi_is_defined(c) && c->lxc_conf && c->lxc_conf->rootfs.path && |
cf465fe4 | 1646 | access(c->lxc_conf->rootfs.path, F_OK) == 0 && tpath) { |
e9e29a33 CB |
1647 | ERROR("Container \"%s\" already exists in \"%s\"", c->name, |
1648 | c->config_path); | |
6c6892b5 | 1649 | goto free_tpath; |
cf465fe4 SH |
1650 | } |
1651 | ||
6c6892b5 | 1652 | if (!c->lxc_conf) { |
858377e4 | 1653 | if (!do_lxcapi_load_config(c, lxc_global_config_value("lxc.default_config"))) { |
e9e29a33 CB |
1654 | ERROR("Error loading default configuration file %s", |
1655 | lxc_global_config_value("lxc.default_config")); | |
6c6892b5 DE |
1656 | goto free_tpath; |
1657 | } | |
96b3cb40 SH |
1658 | } |
1659 | ||
6c6892b5 DE |
1660 | if (!create_container_dir(c)) |
1661 | goto free_tpath; | |
1662 | ||
e9e29a33 CB |
1663 | /* If both template and rootfs.path are set, template is setup as |
1664 | * rootfs.path. The container is already created if we have a config and | |
1665 | * rootfs.path is accessible | |
0590e82c | 1666 | */ |
00370edd | 1667 | if (!c->lxc_conf->rootfs.path && !tpath) { |
e9e29a33 | 1668 | /* No template passed in and rootfs does not exist. */ |
00370edd | 1669 | if (!c->save_config(c, NULL)) { |
e9e29a33 | 1670 | ERROR("Failed to save initial config for \"%s\"", c->name); |
00370edd DW |
1671 | goto out; |
1672 | } | |
1673 | ret = true; | |
0590e82c | 1674 | goto out; |
00370edd | 1675 | } |
e9e29a33 CB |
1676 | |
1677 | /* Rootfs passed into configuration, but does not exist. */ | |
0590e82c | 1678 | if (c->lxc_conf->rootfs.path && access(c->lxc_conf->rootfs.path, F_OK) != 0) |
0590e82c | 1679 | goto out; |
e9e29a33 | 1680 | |
858377e4 | 1681 | if (do_lxcapi_is_defined(c) && c->lxc_conf->rootfs.path && !tpath) { |
e9e29a33 CB |
1682 | /* Rootfs already existed, user just wanted to save the loaded |
1683 | * configuration. | |
1684 | */ | |
0f4cdd77 | 1685 | if (!c->save_config(c, NULL)) |
e9e29a33 | 1686 | ERROR("Failed to save initial config for \"%s\"", c->name); |
0590e82c SH |
1687 | ret = true; |
1688 | goto out; | |
a69aad27 | 1689 | } |
96b3cb40 SH |
1690 | |
1691 | /* Mark that this container is being created */ | |
e9e29a33 CB |
1692 | partial_fd = create_partial(c); |
1693 | if (partial_fd < 0) | |
96b3cb40 SH |
1694 | goto out; |
1695 | ||
e9e29a33 | 1696 | /* No need to get disk lock bc we have the partial lock. */ |
96b3cb40 | 1697 | |
e9e29a33 | 1698 | /* Create the storage. |
96b3cb40 SH |
1699 | * Note we can't do this in the same task as we use to execute the |
1700 | * template because of the way zfs works. | |
1701 | * After you 'zfs create', zfs mounts the fs only in the initial | |
1702 | * namespace. | |
1703 | */ | |
1704 | pid = fork(); | |
1705 | if (pid < 0) { | |
e9e29a33 | 1706 | SYSERROR("Failed to fork task for container creation template"); |
8eb5694b SH |
1707 | goto out_unlock; |
1708 | } | |
1709 | ||
1a0e70ac | 1710 | if (pid == 0) { /* child */ |
10bc1861 | 1711 | struct lxc_storage *bdev = NULL; |
96b3cb40 | 1712 | |
10bc1861 CB |
1713 | bdev = do_storage_create(c, bdevtype, specs); |
1714 | if (!bdev) { | |
e9e29a33 CB |
1715 | ERROR("Failed to create %s storage for %s", |
1716 | bdevtype ? bdevtype : "(none)", c->name); | |
10bc1861 | 1717 | exit(EXIT_FAILURE); |
96b3cb40 SH |
1718 | } |
1719 | ||
e9e29a33 | 1720 | /* Save config file again to store the new rootfs location. */ |
858377e4 | 1721 | if (!do_lxcapi_save_config(c, NULL)) { |
e9e29a33 CB |
1722 | ERROR("Failed to save initial config for %s", c->name); |
1723 | /* Parent task won't see the storage driver in the | |
1724 | * config so we delete it. | |
1725 | */ | |
96b3cb40 SH |
1726 | bdev->ops->umount(bdev); |
1727 | bdev->ops->destroy(bdev); | |
10bc1861 | 1728 | exit(EXIT_FAILURE); |
96b3cb40 | 1729 | } |
10bc1861 | 1730 | exit(EXIT_SUCCESS); |
96b3cb40 SH |
1731 | } |
1732 | if (wait_for_pid(pid) != 0) | |
a09295f8 | 1733 | goto out_unlock; |
96b3cb40 | 1734 | |
e9e29a33 | 1735 | /* Reload config to get the rootfs. */ |
a3b47c09 | 1736 | lxc_conf_free(c->lxc_conf); |
96b3cb40 SH |
1737 | c->lxc_conf = NULL; |
1738 | if (!load_config_locked(c, c->configfile)) | |
a09295f8 | 1739 | goto out_unlock; |
96b3cb40 | 1740 | |
dc23c1c8 | 1741 | if (!create_run_template(c, tpath, !!(flags & LXC_CREATE_QUIET), argv)) |
96b3cb40 SH |
1742 | goto out_unlock; |
1743 | ||
1a0e70ac CB |
1744 | /* Now clear out the lxc_conf we have, reload from the created |
1745 | * container. | |
1746 | */ | |
858377e4 | 1747 | do_lxcapi_clear_config(c); |
3ce74686 | 1748 | |
9d65a487 KY |
1749 | if (t) { |
1750 | if (!prepend_lxc_header(c->configfile, tpath, argv)) { | |
e9e29a33 | 1751 | ERROR("Failed to prepend header to config file"); |
9d65a487 KY |
1752 | goto out_unlock; |
1753 | } | |
3ce74686 | 1754 | } |
a69aad27 | 1755 | ret = load_config_locked(c, c->configfile); |
72d0e1cb SG |
1756 | |
1757 | out_unlock: | |
3e625e2d SH |
1758 | if (partial_fd >= 0) |
1759 | remove_partial(c, partial_fd); | |
72d0e1cb | 1760 | out: |
c55d4505 | 1761 | if (!ret) |
17a367d8 | 1762 | container_destroy(c, NULL); |
6c6892b5 | 1763 | free_tpath: |
f10fad2f | 1764 | free(tpath); |
a69aad27 | 1765 | return ret; |
72d0e1cb SG |
1766 | } |
1767 | ||
858377e4 | 1768 | static bool lxcapi_create(struct lxc_container *c, const char *t, |
e9e29a33 CB |
1769 | const char *bdevtype, struct bdev_specs *specs, |
1770 | int flags, char *const argv[]) | |
858377e4 SH |
1771 | { |
1772 | bool ret; | |
1773 | current_config = c ? c->lxc_conf : NULL; | |
1774 | ret = do_lxcapi_create(c, t, bdevtype, specs, flags, argv); | |
1775 | current_config = NULL; | |
1776 | return ret; | |
1777 | } | |
1778 | ||
1779 | static bool do_lxcapi_reboot(struct lxc_container *c) | |
3e625e2d SH |
1780 | { |
1781 | pid_t pid; | |
dd267776 | 1782 | int rebootsignal = SIGINT; |
3e625e2d SH |
1783 | |
1784 | if (!c) | |
1785 | return false; | |
858377e4 | 1786 | if (!do_lxcapi_is_running(c)) |
3e625e2d | 1787 | return false; |
858377e4 | 1788 | pid = do_lxcapi_init_pid(c); |
3e625e2d SH |
1789 | if (pid <= 0) |
1790 | return false; | |
dd267776 BP |
1791 | if (c->lxc_conf && c->lxc_conf->rebootsignal) |
1792 | rebootsignal = c->lxc_conf->rebootsignal; | |
591614a7 CB |
1793 | if (kill(pid, rebootsignal) < 0) { |
1794 | WARN("Could not send signal %d to pid %d.", rebootsignal, pid); | |
3e625e2d | 1795 | return false; |
591614a7 | 1796 | } |
3e625e2d SH |
1797 | return true; |
1798 | ||
1799 | } | |
1800 | ||
858377e4 SH |
1801 | WRAP_API(bool, lxcapi_reboot) |
1802 | ||
d39b10eb CB |
1803 | static bool do_lxcapi_reboot2(struct lxc_container *c, int timeout) |
1804 | { | |
1805 | int killret, ret; | |
1806 | pid_t pid; | |
1807 | int rebootsignal = SIGINT, state_client_fd = -1; | |
1808 | lxc_state_t states[MAX_STATE] = {0}; | |
1809 | ||
1810 | if (!c) | |
1811 | return false; | |
1812 | ||
1813 | if (!do_lxcapi_is_running(c)) | |
1814 | return true; | |
1815 | ||
1816 | pid = do_lxcapi_init_pid(c); | |
1817 | if (pid <= 0) | |
1818 | return true; | |
1819 | ||
1820 | if (c->lxc_conf && c->lxc_conf->rebootsignal) | |
1821 | rebootsignal = c->lxc_conf->rebootsignal; | |
1822 | ||
1823 | /* Add a new state client before sending the shutdown signal so that we | |
1824 | * don't miss a state. | |
1825 | */ | |
1826 | if (timeout != 0) { | |
1827 | states[RUNNING] = 2; | |
1828 | ret = lxc_cmd_add_state_client(c->name, c->config_path, states, | |
1829 | &state_client_fd); | |
1830 | if (ret < 0) | |
1831 | return false; | |
1832 | ||
1833 | if (state_client_fd < 0) | |
1834 | return false; | |
1835 | ||
1836 | if (ret == RUNNING) | |
1837 | return true; | |
1838 | ||
1839 | if (ret < MAX_STATE) | |
1840 | return false; | |
1841 | } | |
1842 | ||
1843 | /* Send reboot signal to container. */ | |
1844 | killret = kill(pid, rebootsignal); | |
1845 | if (killret < 0) { | |
1846 | WARN("Could not send signal %d to pid %d", rebootsignal, pid); | |
1847 | if (state_client_fd >= 0) | |
1848 | close(state_client_fd); | |
1849 | return false; | |
1850 | } | |
1851 | TRACE("Sent signal %d to pid %d", rebootsignal, pid); | |
1852 | ||
1853 | if (timeout == 0) | |
1854 | return true; | |
1855 | ||
1856 | ret = lxc_cmd_sock_rcv_state(state_client_fd, timeout); | |
1857 | close(state_client_fd); | |
1858 | if (ret < 0) | |
1859 | return false; | |
1860 | ||
1861 | TRACE("Received state \"%s\"", lxc_state2str(ret)); | |
1862 | if (ret != RUNNING) | |
1863 | return false; | |
1864 | ||
1865 | return true; | |
1866 | } | |
1867 | ||
1868 | WRAP_API_1(bool, lxcapi_reboot2, int) | |
1869 | ||
858377e4 | 1870 | static bool do_lxcapi_shutdown(struct lxc_container *c, int timeout) |
72d0e1cb | 1871 | { |
f8bdb6dc | 1872 | int killret, ret; |
72d0e1cb | 1873 | pid_t pid; |
f8bdb6dc | 1874 | int haltsignal = SIGPWR, state_client_fd = -1; |
92e35018 | 1875 | lxc_state_t states[MAX_STATE] = {0}; |
72d0e1cb SG |
1876 | |
1877 | if (!c) | |
1878 | return false; | |
1879 | ||
858377e4 | 1880 | if (!do_lxcapi_is_running(c)) |
72d0e1cb | 1881 | return true; |
f8bdb6dc | 1882 | |
858377e4 | 1883 | pid = do_lxcapi_init_pid(c); |
72d0e1cb SG |
1884 | if (pid <= 0) |
1885 | return true; | |
330ae3d3 CB |
1886 | |
1887 | /* Detect whether we should send SIGRTMIN + 3 (e.g. systemd). */ | |
1888 | if (task_blocking_signal(pid, (SIGRTMIN + 3))) | |
1889 | haltsignal = (SIGRTMIN + 3); | |
1890 | ||
b0227444 | 1891 | if (c->lxc_conf && c->lxc_conf->haltsignal) |
f0f1d8c0 | 1892 | haltsignal = c->lxc_conf->haltsignal; |
330ae3d3 | 1893 | |
92e35018 CB |
1894 | /* Add a new state client before sending the shutdown signal so that we |
1895 | * don't miss a state. | |
1896 | */ | |
f8bdb6dc CB |
1897 | if (timeout != 0) { |
1898 | states[STOPPED] = 1; | |
1899 | ret = lxc_cmd_add_state_client(c->name, c->config_path, states, | |
1900 | &state_client_fd); | |
1901 | if (ret < 0) | |
1902 | return false; | |
92e35018 | 1903 | |
f8bdb6dc CB |
1904 | if (state_client_fd < 0) |
1905 | return false; | |
1906 | ||
1907 | if (ret == STOPPED) | |
1908 | return true; | |
591614a7 | 1909 | |
f8bdb6dc | 1910 | if (ret < MAX_STATE) |
92e35018 | 1911 | return false; |
92e35018 CB |
1912 | } |
1913 | ||
f8bdb6dc CB |
1914 | /* Send shutdown signal to container. */ |
1915 | killret = kill(pid, haltsignal); | |
1916 | if (killret < 0) { | |
1917 | WARN("Could not send signal %d to pid %d", haltsignal, pid); | |
1918 | if (state_client_fd >= 0) | |
1919 | close(state_client_fd); | |
1920 | return false; | |
1921 | } | |
1922 | TRACE("Sent signal %d to pid %d", haltsignal, pid); | |
1923 | ||
1924 | if (timeout == 0) | |
1925 | return true; | |
1926 | ||
1927 | ret = lxc_cmd_sock_rcv_state(state_client_fd, timeout); | |
1928 | close(state_client_fd); | |
1929 | if (ret < 0) | |
1930 | return false; | |
1931 | ||
1932 | TRACE("Received state \"%s\"", lxc_state2str(ret)); | |
1933 | if (ret != STOPPED) | |
1934 | return false; | |
1935 | ||
1936 | return true; | |
72d0e1cb SG |
1937 | } |
1938 | ||
858377e4 SH |
1939 | WRAP_API_1(bool, lxcapi_shutdown, int) |
1940 | ||
1897e3bc | 1941 | static bool lxcapi_createl(struct lxc_container *c, const char *t, |
dc23c1c8 | 1942 | const char *bdevtype, struct bdev_specs *specs, int flags, ...) |
72d0e1cb SG |
1943 | { |
1944 | bool bret = false; | |
a0e93eeb | 1945 | char **args = NULL; |
72d0e1cb | 1946 | va_list ap; |
72d0e1cb SG |
1947 | |
1948 | if (!c) | |
1949 | return false; | |
1950 | ||
858377e4 SH |
1951 | current_config = c->lxc_conf; |
1952 | ||
72d0e1cb SG |
1953 | /* |
1954 | * since we're going to wait for create to finish, I don't think we | |
1955 | * need to get a copy of the arguments. | |
1956 | */ | |
dc23c1c8 | 1957 | va_start(ap, flags); |
a0e93eeb | 1958 | args = lxc_va_arg_list_to_argv(ap, 0, 0); |
72d0e1cb | 1959 | va_end(ap); |
a0e93eeb | 1960 | if (!args) { |
e9e29a33 | 1961 | ERROR("Failed to allocate memory"); |
a0e93eeb CS |
1962 | goto out; |
1963 | } | |
72d0e1cb | 1964 | |
858377e4 | 1965 | bret = do_lxcapi_create(c, t, bdevtype, specs, flags, args); |
72d0e1cb SG |
1966 | |
1967 | out: | |
a0e93eeb | 1968 | free(args); |
858377e4 | 1969 | current_config = NULL; |
72d0e1cb SG |
1970 | return bret; |
1971 | } | |
1972 | ||
6b0d5538 SH |
1973 | static void do_clear_unexp_config_line(struct lxc_conf *conf, const char *key) |
1974 | { | |
4222a9f4 CB |
1975 | if (!strcmp(key, "lxc.cgroup")) |
1976 | return clear_unexp_config_line(conf, key, true); | |
1977 | ||
1978 | if (!strcmp(key, "lxc.network")) | |
1979 | return clear_unexp_config_line(conf, key, true); | |
1980 | ||
1981 | if (!strcmp(key, "lxc.net")) | |
1982 | return clear_unexp_config_line(conf, key, true); | |
1983 | ||
1984 | /* Clear a network with a specific index. */ | |
1985 | if (!strncmp(key, "lxc.net.", 8)) { | |
1986 | int ret; | |
1987 | const char *idx; | |
1988 | ||
1989 | idx = key + 8; | |
1990 | ret = lxc_safe_uint(idx, &(unsigned int){0}); | |
1991 | if (!ret) | |
1992 | return clear_unexp_config_line(conf, key, true); | |
1993 | } | |
1994 | ||
1995 | if (!strcmp(key, "lxc.hook")) | |
1996 | return clear_unexp_config_line(conf, key, true); | |
1997 | ||
1998 | return clear_unexp_config_line(conf, key, false); | |
6b0d5538 SH |
1999 | } |
2000 | ||
6afd673f CB |
2001 | static bool do_lxcapi_clear_config_item(struct lxc_container *c, |
2002 | const char *key) | |
72d0e1cb | 2003 | { |
6afd673f CB |
2004 | int ret = 1; |
2005 | struct lxc_config_t *config; | |
72d0e1cb SG |
2006 | |
2007 | if (!c || !c->lxc_conf) | |
2008 | return false; | |
6afd673f | 2009 | |
5cee8c50 | 2010 | if (container_mem_lock(c)) |
72d0e1cb | 2011 | return false; |
6afd673f | 2012 | |
300df83e | 2013 | config = lxc_get_config(key); |
6afd673f CB |
2014 | /* Verify that the config key exists and that it has a callback |
2015 | * implemented. | |
2016 | */ | |
2017 | if (config && config->clr) | |
26471403 | 2018 | ret = config->clr(key, c->lxc_conf, NULL); |
6b0d5538 SH |
2019 | if (!ret) |
2020 | do_clear_unexp_config_line(c->lxc_conf, key); | |
6afd673f | 2021 | |
5cee8c50 | 2022 | container_mem_unlock(c); |
72d0e1cb SG |
2023 | return ret == 0; |
2024 | } | |
2025 | ||
858377e4 SH |
2026 | WRAP_API_1(bool, lxcapi_clear_config_item, const char *) |
2027 | ||
e0f59189 | 2028 | static inline bool enter_net_ns(struct lxc_container *c) |
51d0854c | 2029 | { |
858377e4 | 2030 | pid_t pid = do_lxcapi_init_pid(c); |
ae22a220 | 2031 | |
0e6e3a41 | 2032 | if ((geteuid() != 0 || (c->lxc_conf && !lxc_list_empty(&c->lxc_conf->id_map))) && access("/proc/self/ns/user", F_OK) == 0) { |
51d0854c DY |
2033 | if (!switch_to_ns(pid, "user")) |
2034 | return false; | |
9c83a661 | 2035 | } |
51d0854c | 2036 | return switch_to_ns(pid, "net"); |
799f29ab ÇO |
2037 | } |
2038 | ||
1a0e70ac | 2039 | /* Used by qsort and bsearch functions for comparing names. */ |
9c88ff1f ÇO |
2040 | static inline int string_cmp(char **first, char **second) |
2041 | { | |
2042 | return strcmp(*first, *second); | |
2043 | } | |
2044 | ||
1a0e70ac CB |
2045 | /* Used by qsort and bsearch functions for comparing container names. */ |
2046 | static inline int container_cmp(struct lxc_container **first, | |
2047 | struct lxc_container **second) | |
9c88ff1f ÇO |
2048 | { |
2049 | return strcmp((*first)->name, (*second)->name); | |
2050 | } | |
2051 | ||
2052 | static bool add_to_array(char ***names, char *cname, int pos) | |
2053 | { | |
2054 | char **newnames = realloc(*names, (pos+1) * sizeof(char *)); | |
2055 | if (!newnames) { | |
2056 | ERROR("Out of memory"); | |
2057 | return false; | |
2058 | } | |
2059 | ||
2060 | *names = newnames; | |
2061 | newnames[pos] = strdup(cname); | |
2062 | if (!newnames[pos]) | |
2063 | return false; | |
2064 | ||
1a0e70ac CB |
2065 | /* Sort the arrray as we will use binary search on it. */ |
2066 | qsort(newnames, pos + 1, sizeof(char *), | |
2067 | (int (*)(const void *, const void *))string_cmp); | |
9c88ff1f ÇO |
2068 | |
2069 | return true; | |
2070 | } | |
2071 | ||
1a0e70ac CB |
2072 | static bool add_to_clist(struct lxc_container ***list, struct lxc_container *c, |
2073 | int pos, bool sort) | |
9c88ff1f | 2074 | { |
1a0e70ac | 2075 | struct lxc_container **newlist = realloc(*list, (pos + 1) * sizeof(struct lxc_container *)); |
9c88ff1f ÇO |
2076 | if (!newlist) { |
2077 | ERROR("Out of memory"); | |
2078 | return false; | |
2079 | } | |
2080 | ||
2081 | *list = newlist; | |
2082 | newlist[pos] = c; | |
2083 | ||
1a0e70ac | 2084 | /* Sort the arrray as we will use binary search on it. */ |
2871830a | 2085 | if (sort) |
1a0e70ac CB |
2086 | qsort(newlist, pos + 1, sizeof(struct lxc_container *), |
2087 | (int (*)(const void *, const void *))container_cmp); | |
9c88ff1f ÇO |
2088 | |
2089 | return true; | |
2090 | } | |
2091 | ||
2092 | static char** get_from_array(char ***names, char *cname, int size) | |
2093 | { | |
2094 | return (char **)bsearch(&cname, *names, size, sizeof(char *), (int (*)(const void *, const void *))string_cmp); | |
2095 | } | |
2096 | ||
2097 | ||
2098 | static bool array_contains(char ***names, char *cname, int size) { | |
2099 | if(get_from_array(names, cname, size) != NULL) | |
2100 | return true; | |
2101 | return false; | |
2102 | } | |
2103 | ||
2104 | static bool remove_from_array(char ***names, char *cname, int size) | |
2105 | { | |
2106 | char **result = get_from_array(names, cname, size); | |
2107 | if (result != NULL) { | |
2108 | free(result); | |
2109 | return true; | |
2110 | } | |
2111 | return false; | |
2112 | } | |
2113 | ||
858377e4 | 2114 | static char ** do_lxcapi_get_interfaces(struct lxc_container *c) |
799f29ab | 2115 | { |
ae22a220 ÇO |
2116 | pid_t pid; |
2117 | int i, count = 0, pipefd[2]; | |
9c88ff1f | 2118 | char **interfaces = NULL; |
ae22a220 | 2119 | char interface[IFNAMSIZ]; |
799f29ab | 2120 | |
ae22a220 ÇO |
2121 | if(pipe(pipefd) < 0) { |
2122 | SYSERROR("pipe failed"); | |
2123 | return NULL; | |
c868b261 ÇO |
2124 | } |
2125 | ||
ae22a220 ÇO |
2126 | pid = fork(); |
2127 | if (pid < 0) { | |
959aee9c | 2128 | SYSERROR("failed to fork task to get interfaces information"); |
ae22a220 ÇO |
2129 | close(pipefd[0]); |
2130 | close(pipefd[1]); | |
2131 | return NULL; | |
2132 | } | |
799f29ab | 2133 | |
1a0e70ac | 2134 | if (pid == 0) { /* child */ |
ae22a220 ÇO |
2135 | int ret = 1, nbytes; |
2136 | struct ifaddrs *interfaceArray = NULL, *tempIfAddr = NULL; | |
2137 | ||
2138 | /* close the read-end of the pipe */ | |
2139 | close(pipefd[0]); | |
2140 | ||
e0f59189 | 2141 | if (!enter_net_ns(c)) { |
ae22a220 ÇO |
2142 | SYSERROR("failed to enter namespace"); |
2143 | goto out; | |
2144 | } | |
2145 | ||
2146 | /* Grab the list of interfaces */ | |
2147 | if (getifaddrs(&interfaceArray)) { | |
2148 | SYSERROR("failed to get interfaces list"); | |
2149 | goto out; | |
2150 | } | |
2151 | ||
2152 | /* Iterate through the interfaces */ | |
2153 | for (tempIfAddr = interfaceArray; tempIfAddr != NULL; tempIfAddr = tempIfAddr->ifa_next) { | |
2154 | nbytes = write(pipefd[1], tempIfAddr->ifa_name, IFNAMSIZ); | |
2155 | if (nbytes < 0) { | |
2156 | ERROR("write failed"); | |
2157 | goto out; | |
2158 | } | |
2159 | count++; | |
2160 | } | |
2161 | ret = 0; | |
2162 | ||
2163 | out: | |
2164 | if (interfaceArray) | |
2165 | freeifaddrs(interfaceArray); | |
2166 | ||
2167 | /* close the write-end of the pipe, thus sending EOF to the reader */ | |
2168 | close(pipefd[1]); | |
2169 | exit(ret); | |
799f29ab ÇO |
2170 | } |
2171 | ||
ae22a220 ÇO |
2172 | /* close the write-end of the pipe */ |
2173 | close(pipefd[1]); | |
2174 | ||
358afd84 | 2175 | while (read(pipefd[0], &interface, IFNAMSIZ) == IFNAMSIZ) { |
3151d4e2 CB |
2176 | interface[IFNAMSIZ - 1] = '\0'; |
2177 | ||
ae22a220 ÇO |
2178 | if (array_contains(&interfaces, interface, count)) |
2179 | continue; | |
799f29ab | 2180 | |
ae22a220 | 2181 | if(!add_to_array(&interfaces, interface, count)) |
3151d4e2 CB |
2182 | ERROR("Failed to add \"%s\" to array", interface); |
2183 | ||
9c88ff1f ÇO |
2184 | count++; |
2185 | } | |
799f29ab | 2186 | |
ae22a220 ÇO |
2187 | if (wait_for_pid(pid) != 0) { |
2188 | for(i=0;i<count;i++) | |
2189 | free(interfaces[i]); | |
2190 | free(interfaces); | |
2191 | interfaces = NULL; | |
2192 | } | |
9c88ff1f | 2193 | |
ae22a220 ÇO |
2194 | /* close the read-end of the pipe */ |
2195 | close(pipefd[0]); | |
799f29ab | 2196 | |
9c88ff1f ÇO |
2197 | /* Append NULL to the array */ |
2198 | if(interfaces) | |
2199 | interfaces = (char **)lxc_append_null_to_array((void **)interfaces, count); | |
799f29ab | 2200 | |
9c88ff1f | 2201 | return interfaces; |
799f29ab ÇO |
2202 | } |
2203 | ||
858377e4 SH |
2204 | WRAP_API(char **, lxcapi_get_interfaces) |
2205 | ||
2206 | static char** do_lxcapi_get_ips(struct lxc_container *c, const char* interface, const char* family, int scope) | |
799f29ab | 2207 | { |
ae22a220 ÇO |
2208 | pid_t pid; |
2209 | int i, count = 0, pipefd[2]; | |
9c88ff1f | 2210 | char **addresses = NULL; |
ae22a220 | 2211 | char address[INET6_ADDRSTRLEN]; |
799f29ab | 2212 | |
ae22a220 ÇO |
2213 | if(pipe(pipefd) < 0) { |
2214 | SYSERROR("pipe failed"); | |
2215 | return NULL; | |
c868b261 ÇO |
2216 | } |
2217 | ||
ae22a220 ÇO |
2218 | pid = fork(); |
2219 | if (pid < 0) { | |
959aee9c | 2220 | SYSERROR("failed to fork task to get container ips"); |
ae22a220 ÇO |
2221 | close(pipefd[0]); |
2222 | close(pipefd[1]); | |
2223 | return NULL; | |
9c83a661 SG |
2224 | } |
2225 | ||
1a0e70ac | 2226 | if (pid == 0) { /* child */ |
ae22a220 ÇO |
2227 | int ret = 1, nbytes; |
2228 | struct ifaddrs *interfaceArray = NULL, *tempIfAddr = NULL; | |
2229 | char addressOutputBuffer[INET6_ADDRSTRLEN]; | |
2230 | void *tempAddrPtr = NULL; | |
2231 | char *address = NULL; | |
fe218ca3 | 2232 | |
ae22a220 ÇO |
2233 | /* close the read-end of the pipe */ |
2234 | close(pipefd[0]); | |
2235 | ||
e0f59189 | 2236 | if (!enter_net_ns(c)) { |
ae22a220 ÇO |
2237 | SYSERROR("failed to enter namespace"); |
2238 | goto out; | |
9c83a661 | 2239 | } |
ae22a220 ÇO |
2240 | |
2241 | /* Grab the list of interfaces */ | |
2242 | if (getifaddrs(&interfaceArray)) { | |
2243 | SYSERROR("failed to get interfaces list"); | |
2244 | goto out; | |
2245 | } | |
2246 | ||
2247 | /* Iterate through the interfaces */ | |
2248 | for (tempIfAddr = interfaceArray; tempIfAddr != NULL; tempIfAddr = tempIfAddr->ifa_next) { | |
2249 | if (tempIfAddr->ifa_addr == NULL) | |
9c83a661 SG |
2250 | continue; |
2251 | ||
ae22a220 ÇO |
2252 | if(tempIfAddr->ifa_addr->sa_family == AF_INET) { |
2253 | if (family && strcmp(family, "inet")) | |
2254 | continue; | |
2255 | tempAddrPtr = &((struct sockaddr_in *)tempIfAddr->ifa_addr)->sin_addr; | |
2256 | } | |
2257 | else { | |
2258 | if (family && strcmp(family, "inet6")) | |
2259 | continue; | |
2260 | ||
2261 | if (((struct sockaddr_in6 *)tempIfAddr->ifa_addr)->sin6_scope_id != scope) | |
2262 | continue; | |
2263 | ||
2264 | tempAddrPtr = &((struct sockaddr_in6 *)tempIfAddr->ifa_addr)->sin6_addr; | |
2265 | } | |
2266 | ||
2267 | if (interface && strcmp(interface, tempIfAddr->ifa_name)) | |
2268 | continue; | |
2269 | else if (!interface && strcmp("lo", tempIfAddr->ifa_name) == 0) | |
9c83a661 SG |
2270 | continue; |
2271 | ||
ae22a220 ÇO |
2272 | address = (char *)inet_ntop(tempIfAddr->ifa_addr->sa_family, |
2273 | tempAddrPtr, | |
2274 | addressOutputBuffer, | |
2275 | sizeof(addressOutputBuffer)); | |
2276 | if (!address) | |
2277 | continue; | |
2278 | ||
2279 | nbytes = write(pipefd[1], address, INET6_ADDRSTRLEN); | |
2280 | if (nbytes < 0) { | |
2281 | ERROR("write failed"); | |
2282 | goto out; | |
2283 | } | |
2284 | count++; | |
9c83a661 | 2285 | } |
ae22a220 | 2286 | ret = 0; |
9c83a661 | 2287 | |
ae22a220 ÇO |
2288 | out: |
2289 | if(interfaceArray) | |
2290 | freeifaddrs(interfaceArray); | |
9c83a661 | 2291 | |
ae22a220 ÇO |
2292 | /* close the write-end of the pipe, thus sending EOF to the reader */ |
2293 | close(pipefd[1]); | |
2294 | exit(ret); | |
6849cb5b | 2295 | } |
9c83a661 | 2296 | |
ae22a220 ÇO |
2297 | /* close the write-end of the pipe */ |
2298 | close(pipefd[1]); | |
2299 | ||
358afd84 | 2300 | while (read(pipefd[0], &address, INET6_ADDRSTRLEN) == INET6_ADDRSTRLEN) { |
9c88ff1f | 2301 | if(!add_to_array(&addresses, address, count)) |
ae22a220 | 2302 | ERROR("PARENT: add_to_array failed"); |
9c88ff1f | 2303 | count++; |
9c83a661 SG |
2304 | } |
2305 | ||
ae22a220 ÇO |
2306 | if (wait_for_pid(pid) != 0) { |
2307 | for(i=0;i<count;i++) | |
2308 | free(addresses[i]); | |
2309 | free(addresses); | |
2310 | addresses = NULL; | |
2311 | } | |
9c83a661 | 2312 | |
ae22a220 ÇO |
2313 | /* close the read-end of the pipe */ |
2314 | close(pipefd[0]); | |
9c83a661 SG |
2315 | |
2316 | /* Append NULL to the array */ | |
9c88ff1f ÇO |
2317 | if(addresses) |
2318 | addresses = (char **)lxc_append_null_to_array((void **)addresses, count); | |
9c83a661 SG |
2319 | |
2320 | return addresses; | |
2321 | } | |
2322 | ||
858377e4 SH |
2323 | WRAP_API_3(char **, lxcapi_get_ips, const char *, const char *, int) |
2324 | ||
2325 | static int do_lxcapi_get_config_item(struct lxc_container *c, const char *key, char *retv, int inlen) | |
72d0e1cb | 2326 | { |
fce687aa CB |
2327 | int ret = -1; |
2328 | struct lxc_config_t *config; | |
72d0e1cb SG |
2329 | |
2330 | if (!c || !c->lxc_conf) | |
2331 | return -1; | |
fce687aa | 2332 | |
5cee8c50 | 2333 | if (container_mem_lock(c)) |
72d0e1cb | 2334 | return -1; |
fce687aa | 2335 | |
300df83e | 2336 | config = lxc_get_config(key); |
fce687aa CB |
2337 | /* Verify that the config key exists and that it has a callback |
2338 | * implemented. | |
2339 | */ | |
2340 | if (config && config->get) | |
cccd2219 | 2341 | ret = config->get(key, retv, inlen, c->lxc_conf, NULL); |
fce687aa | 2342 | |
5cee8c50 | 2343 | container_mem_unlock(c); |
72d0e1cb SG |
2344 | return ret; |
2345 | } | |
2346 | ||
858377e4 SH |
2347 | WRAP_API_3(int, lxcapi_get_config_item, const char *, char *, int) |
2348 | ||
2349 | static char* do_lxcapi_get_running_config_item(struct lxc_container *c, const char *key) | |
8ac18377 ÇO |
2350 | { |
2351 | char *ret; | |
2352 | ||
2353 | if (!c || !c->lxc_conf) | |
2354 | return NULL; | |
2355 | if (container_mem_lock(c)) | |
2356 | return NULL; | |
858377e4 | 2357 | ret = lxc_cmd_get_config_item(c->name, key, do_lxcapi_get_config_path(c)); |
8ac18377 ÇO |
2358 | container_mem_unlock(c); |
2359 | return ret; | |
2360 | } | |
2361 | ||
858377e4 SH |
2362 | WRAP_API_1(char *, lxcapi_get_running_config_item, const char *) |
2363 | ||
2364 | static int do_lxcapi_get_keys(struct lxc_container *c, const char *key, char *retv, int inlen) | |
72d0e1cb | 2365 | { |
300df83e CB |
2366 | int ret = -1; |
2367 | ||
2368 | /* List all config items. */ | |
72d0e1cb | 2369 | if (!key) |
cfc67626 | 2370 | return lxc_list_config_items(retv, inlen); |
300df83e | 2371 | |
72d0e1cb SG |
2372 | if (!c || !c->lxc_conf) |
2373 | return -1; | |
300df83e | 2374 | |
5cee8c50 | 2375 | if (container_mem_lock(c)) |
72d0e1cb | 2376 | return -1; |
300df83e CB |
2377 | |
2378 | /* Support 'lxc.net.<idx>', i.e. 'lxc.net.0' | |
2379 | * This is an intelligent result to show which keys are valid given the | |
2380 | * type of nic it is. | |
2381 | */ | |
6fba98b5 | 2382 | if (strncmp(key, "lxc.net.", 8) == 0) |
01f55c40 | 2383 | ret = lxc_list_net(c->lxc_conf, key, retv, inlen); |
fe9b7349 CB |
2384 | else |
2385 | ret = lxc_list_subkeys(c->lxc_conf, key, retv, inlen); | |
300df83e | 2386 | |
5cee8c50 | 2387 | container_mem_unlock(c); |
72d0e1cb SG |
2388 | return ret; |
2389 | } | |
2390 | ||
858377e4 SH |
2391 | WRAP_API_3(int, lxcapi_get_keys, const char *, char *, int) |
2392 | ||
2393 | static bool do_lxcapi_save_config(struct lxc_container *c, const char *alt_file) | |
72d0e1cb | 2394 | { |
39dc698c SH |
2395 | FILE *fout; |
2396 | bool ret = false, need_disklock = false; | |
2397 | int lret; | |
2398 | ||
72d0e1cb SG |
2399 | if (!alt_file) |
2400 | alt_file = c->configfile; | |
2401 | if (!alt_file) | |
1a0e70ac | 2402 | return false; |
39dc698c | 2403 | |
1a0e70ac | 2404 | /* If we haven't yet loaded a config, load the stock config. */ |
39dc698c | 2405 | if (!c->lxc_conf) { |
858377e4 | 2406 | if (!do_lxcapi_load_config(c, lxc_global_config_value("lxc.default_config"))) { |
959aee9c | 2407 | ERROR("Error loading default configuration file %s while saving %s", lxc_global_config_value("lxc.default_config"), c->name); |
72d0e1cb SG |
2408 | return false; |
2409 | } | |
39dc698c | 2410 | } |
72d0e1cb | 2411 | |
5a3d2e1e SG |
2412 | if (!create_container_dir(c)) |
2413 | return false; | |
2414 | ||
1a0e70ac CB |
2415 | /* If we're writing to the container's config file, take the disk lock. |
2416 | * Otherwise just take the memlock to protect the struct lxc_container | |
2417 | * while we're traversing it. | |
39dc698c SH |
2418 | */ |
2419 | if (strcmp(c->configfile, alt_file) == 0) | |
2420 | need_disklock = true; | |
2421 | ||
2422 | if (need_disklock) | |
2423 | lret = container_disk_lock(c); | |
2424 | else | |
2425 | lret = container_mem_lock(c); | |
2426 | ||
2427 | if (lret) | |
72d0e1cb | 2428 | return false; |
39dc698c SH |
2429 | |
2430 | fout = fopen(alt_file, "w"); | |
2431 | if (!fout) | |
2432 | goto out; | |
6b0d5538 | 2433 | write_config(fout, c->lxc_conf); |
72d0e1cb | 2434 | fclose(fout); |
39dc698c SH |
2435 | ret = true; |
2436 | ||
2437 | out: | |
2438 | if (need_disklock) | |
2439 | container_disk_unlock(c); | |
2440 | else | |
2441 | container_mem_unlock(c); | |
2442 | return ret; | |
72d0e1cb SG |
2443 | } |
2444 | ||
858377e4 SH |
2445 | WRAP_API_1(bool, lxcapi_save_config, const char *) |
2446 | ||
0ea055b3 CB |
2447 | |
2448 | static bool mod_rdep(struct lxc_container *c0, struct lxc_container *c, bool inc) | |
dfb31b25 | 2449 | { |
0ea055b3 CB |
2450 | FILE *f1; |
2451 | struct stat fbuf; | |
42342bed CB |
2452 | void *buf = NULL; |
2453 | char *del = NULL; | |
dfb31b25 | 2454 | char path[MAXPATHLEN]; |
0ea055b3 CB |
2455 | char newpath[MAXPATHLEN]; |
2456 | int fd, ret, n = 0, v = 0; | |
dfb31b25 | 2457 | bool bret = false; |
42342bed | 2458 | size_t len = 0, bytes = 0; |
dfb31b25 | 2459 | |
0ea055b3 | 2460 | if (container_disk_lock(c0)) |
dfb31b25 | 2461 | return false; |
0ea055b3 CB |
2462 | |
2463 | ret = snprintf(path, MAXPATHLEN, "%s/%s/lxc_snapshots", c0->config_path, c0->name); | |
dfb31b25 SH |
2464 | if (ret < 0 || ret > MAXPATHLEN) |
2465 | goto out; | |
0ea055b3 CB |
2466 | ret = snprintf(newpath, MAXPATHLEN, "%s\n%s\n", c->config_path, c->name); |
2467 | if (ret < 0 || ret > MAXPATHLEN) | |
dfb31b25 | 2468 | goto out; |
0ea055b3 CB |
2469 | |
2470 | /* If we find an lxc-snapshot file using the old format only listing the | |
2471 | * number of snapshots we will keep using it. */ | |
2472 | f1 = fopen(path, "r"); | |
2473 | if (f1) { | |
2474 | n = fscanf(f1, "%d", &v); | |
2475 | fclose(f1); | |
2476 | if (n == 1 && v == 0) { | |
2477 | remove(path); | |
2478 | n = 0; | |
2479 | } | |
dfb31b25 | 2480 | } |
0ea055b3 CB |
2481 | if (n == 1) { |
2482 | v += inc ? 1 : -1; | |
2483 | f1 = fopen(path, "w"); | |
2484 | if (!f1) | |
2485 | goto out; | |
2486 | if (fprintf(f1, "%d\n", v) < 0) { | |
2487 | ERROR("Error writing new snapshots value"); | |
2488 | fclose(f1); | |
2489 | goto out; | |
2490 | } | |
2491 | ret = fclose(f1); | |
2492 | if (ret != 0) { | |
2493 | SYSERROR("Error writing to or closing snapshots file"); | |
2494 | goto out; | |
2495 | } | |
2496 | } else { | |
2497 | /* Here we know that we have or can use an lxc-snapshot file | |
2498 | * using the new format. */ | |
2499 | if (inc) { | |
2500 | f1 = fopen(path, "a"); | |
2501 | if (!f1) | |
2502 | goto out; | |
2503 | ||
2504 | if (fprintf(f1, "%s", newpath) < 0) { | |
2505 | ERROR("Error writing new snapshots entry"); | |
2506 | ret = fclose(f1); | |
2507 | if (ret != 0) | |
2508 | SYSERROR("Error writing to or closing snapshots file"); | |
2509 | goto out; | |
2510 | } | |
2511 | ||
2512 | ret = fclose(f1); | |
2513 | if (ret != 0) { | |
2514 | SYSERROR("Error writing to or closing snapshots file"); | |
2515 | goto out; | |
2516 | } | |
2517 | } else if (!inc) { | |
d028235d SG |
2518 | if ((fd = open(path, O_RDWR | O_CLOEXEC)) < 0) |
2519 | goto out; | |
2520 | ||
2521 | if (fstat(fd, &fbuf) < 0) { | |
2522 | close(fd); | |
2523 | goto out; | |
2524 | } | |
2525 | ||
2526 | if (fbuf.st_size != 0) { | |
d028235d | 2527 | |
25086a5f | 2528 | buf = lxc_strmmap(NULL, fbuf.st_size, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0); |
d028235d SG |
2529 | if (buf == MAP_FAILED) { |
2530 | SYSERROR("Failed to create mapping %s", path); | |
2531 | close(fd); | |
2532 | goto out; | |
2533 | } | |
2534 | ||
2535 | len = strlen(newpath); | |
2536 | while ((del = strstr((char *)buf, newpath))) { | |
2537 | memmove(del, del + len, strlen(del) - len + 1); | |
2538 | bytes += len; | |
2539 | } | |
2540 | ||
25086a5f | 2541 | lxc_strmunmap(buf, fbuf.st_size); |
d028235d SG |
2542 | if (ftruncate(fd, fbuf.st_size - bytes) < 0) { |
2543 | SYSERROR("Failed to truncate file %s", path); | |
2544 | close(fd); | |
2545 | goto out; | |
2546 | } | |
2547 | } | |
2548 | close(fd); | |
2549 | } | |
0ea055b3 CB |
2550 | |
2551 | /* If the lxc-snapshot file is empty, remove it. */ | |
2552 | if (stat(path, &fbuf) < 0) | |
2553 | goto out; | |
d028235d SG |
2554 | if (!fbuf.st_size) { |
2555 | remove(path); | |
0ea055b3 | 2556 | } |
dfb31b25 SH |
2557 | } |
2558 | ||
2559 | bret = true; | |
2560 | ||
2561 | out: | |
0ea055b3 | 2562 | container_disk_unlock(c0); |
dfb31b25 SH |
2563 | return bret; |
2564 | } | |
2565 | ||
2566 | static void strip_newline(char *p) | |
2567 | { | |
2568 | size_t len = strlen(p); | |
2569 | if (len < 1) | |
2570 | return; | |
2571 | if (p[len-1] == '\n') | |
2572 | p[len-1] = '\0'; | |
2573 | } | |
2574 | ||
d825fff3 | 2575 | void mod_all_rdeps(struct lxc_container *c, bool inc) |
dfb31b25 SH |
2576 | { |
2577 | struct lxc_container *p; | |
2578 | char *lxcpath = NULL, *lxcname = NULL, path[MAXPATHLEN]; | |
2579 | size_t pathlen = 0, namelen = 0; | |
2580 | FILE *f; | |
2581 | int ret; | |
2582 | ||
2583 | ret = snprintf(path, MAXPATHLEN, "%s/%s/lxc_rdepends", | |
2584 | c->config_path, c->name); | |
2585 | if (ret < 0 || ret >= MAXPATHLEN) { | |
2586 | ERROR("Path name too long"); | |
2587 | return; | |
2588 | } | |
025ed0f3 | 2589 | f = fopen(path, "r"); |
025ed0f3 | 2590 | if (f == NULL) |
dfb31b25 SH |
2591 | return; |
2592 | while (getline(&lxcpath, &pathlen, f) != -1) { | |
2593 | if (getline(&lxcname, &namelen, f) == -1) { | |
959aee9c | 2594 | ERROR("badly formatted file %s", path); |
dfb31b25 SH |
2595 | goto out; |
2596 | } | |
2597 | strip_newline(lxcpath); | |
2598 | strip_newline(lxcname); | |
2599 | if ((p = lxc_container_new(lxcname, lxcpath)) == NULL) { | |
2600 | ERROR("Unable to find dependent container %s:%s", | |
2601 | lxcpath, lxcname); | |
2602 | continue; | |
2603 | } | |
0ea055b3 CB |
2604 | if (!mod_rdep(p, c, inc)) |
2605 | ERROR("Failed to update snapshots file for %s:%s", | |
dfb31b25 SH |
2606 | lxcpath, lxcname); |
2607 | lxc_container_put(p); | |
2608 | } | |
2609 | out: | |
f10fad2f ME |
2610 | free(lxcpath); |
2611 | free(lxcname); | |
dfb31b25 SH |
2612 | fclose(f); |
2613 | } | |
2614 | ||
18aa217b | 2615 | static bool has_fs_snapshots(struct lxc_container *c) |
dfb31b25 | 2616 | { |
0ea055b3 | 2617 | FILE *f; |
dfb31b25 SH |
2618 | char path[MAXPATHLEN]; |
2619 | int ret, v; | |
0ea055b3 | 2620 | struct stat fbuf; |
dfb31b25 SH |
2621 | bool bret = false; |
2622 | ||
2623 | ret = snprintf(path, MAXPATHLEN, "%s/%s/lxc_snapshots", c->config_path, | |
2624 | c->name); | |
2625 | if (ret < 0 || ret > MAXPATHLEN) | |
2626 | goto out; | |
0ea055b3 CB |
2627 | /* If the file doesn't exist there are no snapshots. */ |
2628 | if (stat(path, &fbuf) < 0) | |
dfb31b25 | 2629 | goto out; |
0ea055b3 CB |
2630 | v = fbuf.st_size; |
2631 | if (v != 0) { | |
2632 | f = fopen(path, "r"); | |
2633 | if (!f) | |
2634 | goto out; | |
2635 | ret = fscanf(f, "%d", &v); | |
2636 | fclose(f); | |
1a0e70ac | 2637 | /* TODO: Figure out what to do with the return value of fscanf. */ |
0ea055b3 CB |
2638 | if (ret != 1) |
2639 | INFO("Container uses new lxc-snapshots format %s", path); | |
2640 | } | |
dfb31b25 SH |
2641 | bret = v != 0; |
2642 | ||
2643 | out: | |
2644 | return bret; | |
2645 | } | |
2646 | ||
18aa217b SH |
2647 | static bool has_snapshots(struct lxc_container *c) |
2648 | { | |
2649 | char path[MAXPATHLEN]; | |
74f96976 | 2650 | struct dirent *direntp; |
18aa217b SH |
2651 | int count=0; |
2652 | DIR *dir; | |
2653 | ||
2654 | if (!get_snappath_dir(c, path)) | |
2655 | return false; | |
2656 | dir = opendir(path); | |
2657 | if (!dir) | |
2658 | return false; | |
74f96976 | 2659 | while ((direntp = readdir(dir))) { |
18aa217b SH |
2660 | if (!direntp) |
2661 | break; | |
2662 | ||
2663 | if (!strcmp(direntp->d_name, ".")) | |
2664 | continue; | |
2665 | ||
2666 | if (!strcmp(direntp->d_name, "..")) | |
2667 | continue; | |
2668 | count++; | |
2669 | break; | |
2670 | } | |
2671 | closedir(dir); | |
2672 | return count > 0; | |
2673 | } | |
2674 | ||
297c2d58 | 2675 | static bool do_destroy_container(struct lxc_conf *conf) { |
ee484f7f CB |
2676 | int ret; |
2677 | ||
e0010464 | 2678 | if (am_guest_unpriv()) { |
ee484f7f CB |
2679 | ret = userns_exec_full(conf, storage_destroy_wrapper, conf, |
2680 | "storage_destroy_wrapper"); | |
2681 | if (ret < 0) | |
d028235d | 2682 | return false; |
ee484f7f | 2683 | |
d028235d SG |
2684 | return true; |
2685 | } | |
ee484f7f | 2686 | |
10bc1861 | 2687 | return storage_destroy(conf); |
297c2d58 CB |
2688 | } |
2689 | ||
4355ab5f SH |
2690 | static int lxc_rmdir_onedev_wrapper(void *data) |
2691 | { | |
2692 | char *arg = (char *) data; | |
18aa217b | 2693 | return lxc_rmdir_onedev(arg, "snaps"); |
4355ab5f SH |
2694 | } |
2695 | ||
17a367d8 | 2696 | static int lxc_unlink_exec_wrapper(void *data) |
72d0e1cb | 2697 | { |
17a367d8 CB |
2698 | char *arg = data; |
2699 | return unlink(arg); | |
2700 | } | |
2701 | ||
2702 | static bool container_destroy(struct lxc_container *c, | |
2703 | struct lxc_storage *storage) | |
2704 | { | |
2705 | const char *p1; | |
2706 | size_t len; | |
2707 | struct lxc_conf *conf; | |
2708 | char *path = NULL; | |
c868b261 | 2709 | bool bret = false; |
297c2d58 | 2710 | int ret = 0; |
72d0e1cb | 2711 | |
858377e4 | 2712 | if (!c || !do_lxcapi_is_defined(c)) |
5a3d2e1e SG |
2713 | return false; |
2714 | ||
a70a69e8 | 2715 | conf = c->lxc_conf; |
3bc449ed | 2716 | if (container_disk_lock(c)) |
72d0e1cb | 2717 | return false; |
72d0e1cb | 2718 | |
39dc698c | 2719 | if (!is_stopped(c)) { |
1a0e70ac | 2720 | /* We should queue some sort of error - in c->error_string? */ |
60bf62d4 SH |
2721 | ERROR("container %s is not stopped", c->name); |
2722 | goto out; | |
72d0e1cb SG |
2723 | } |
2724 | ||
a70a69e8 | 2725 | if (conf && !lxc_list_empty(&conf->hooks[LXCHOOK_DESTROY])) { |
37cf711b | 2726 | /* Start of environment variable setup for hooks */ |
cb8ff4d0 | 2727 | if (setenv("LXC_NAME", c->name, 1)) |
17a367d8 CB |
2728 | SYSERROR("Failed to set environment variable for container name"); |
2729 | ||
2730 | if (conf->rcfile && setenv("LXC_CONFIG_FILE", conf->rcfile, 1)) | |
2731 | SYSERROR("Failed to set environment variable for config path"); | |
2732 | ||
2733 | if (conf->rootfs.mount && setenv("LXC_ROOTFS_MOUNT", conf->rootfs.mount, 1)) | |
2734 | SYSERROR("Failed to set environment variable for rootfs mount"); | |
2735 | ||
2736 | if (conf->rootfs.path && setenv("LXC_ROOTFS_PATH", conf->rootfs.path, 1)) | |
2737 | SYSERROR("Failed to set environment variable for rootfs mount"); | |
2738 | ||
2739 | if (conf->console.path && setenv("LXC_CONSOLE", conf->console.path, 1)) | |
2740 | SYSERROR("Failed to set environment variable for console path"); | |
2741 | ||
2742 | if (conf->console.log_path && setenv("LXC_CONSOLE_LOGPATH", conf->console.log_path, 1)) | |
2743 | SYSERROR("Failed to set environment variable for console log"); | |
37cf711b SY |
2744 | /* End of environment variable setup for hooks */ |
2745 | ||
14a7b0f9 | 2746 | if (run_lxc_hooks(c->name, "destroy", conf, NULL)) { |
17a367d8 | 2747 | ERROR("Failed to execute clone hook for \"%s\"", c->name); |
37cf711b SY |
2748 | goto out; |
2749 | } | |
2750 | } | |
2751 | ||
2752 | if (current_config && conf == current_config) { | |
858377e4 | 2753 | current_config = NULL; |
37cf711b SY |
2754 | if (conf->logfd != -1) { |
2755 | close(conf->logfd); | |
2756 | conf->logfd = -1; | |
858377e4 SH |
2757 | } |
2758 | } | |
2759 | ||
d028235d SG |
2760 | if (conf && conf->rootfs.path && conf->rootfs.mount) { |
2761 | if (!do_destroy_container(conf)) { | |
2762 | ERROR("Error destroying rootfs for %s", c->name); | |
2763 | goto out; | |
2764 | } | |
2765 | INFO("Destroyed rootfs for %s", c->name); | |
2766 | } | |
60bf62d4 | 2767 | |
dfb31b25 SH |
2768 | mod_all_rdeps(c, false); |
2769 | ||
17a367d8 CB |
2770 | p1 = do_lxcapi_get_config_path(c); |
2771 | /* strlen(p1) | |
2772 | * + | |
2773 | * / | |
2774 | * + | |
2775 | * strlen(c->name) | |
2776 | * + | |
2777 | * / | |
2778 | * + | |
2779 | * strlen("config") = 6 | |
2780 | * + | |
2781 | * \0 | |
2782 | */ | |
2783 | len = strlen(p1) + 1 + strlen(c->name) + 1 + 6 + 1; | |
2784 | path = malloc(len); | |
2785 | if (!path) { | |
2786 | ERROR("Failed to allocate memory"); | |
2787 | goto out; | |
2788 | } | |
2789 | ||
2790 | /* For an overlay container the rootfs is considered immutable and | |
2791 | * cannot be removed when restoring from a snapshot. | |
2792 | */ | |
2793 | if (storage && (!strcmp(storage->type, "overlay") || | |
2794 | !strcmp(storage->type, "overlayfs")) && | |
2795 | (storage->flags & LXC_STORAGE_INTERNAL_OVERLAY_RESTORE)) { | |
2796 | ret = snprintf(path, len, "%s/%s/config", p1, c->name); | |
2797 | if (ret < 0 || (size_t)ret >= len) | |
2798 | goto out; | |
2799 | ||
e0010464 | 2800 | if (am_guest_unpriv()) |
17a367d8 CB |
2801 | ret = userns_exec_1(conf, lxc_unlink_exec_wrapper, path, |
2802 | "lxc_unlink_exec_wrapper"); | |
2803 | else | |
2804 | ret = unlink(path); | |
2805 | if (ret < 0) { | |
2806 | SYSERROR("Failed to destroy config file \"%s\" for \"%s\"", | |
2807 | path, c->name); | |
2808 | goto out; | |
2809 | } | |
2810 | INFO("Destroyed config file \"%s\" for \"%s\"", path, c->name); | |
2811 | ||
2812 | bret = true; | |
2813 | goto out; | |
2814 | } | |
2815 | ||
2816 | ret = snprintf(path, len, "%s/%s", p1, c->name); | |
2817 | if (ret < 0 || (size_t)ret >= len) | |
2818 | goto out; | |
e0010464 | 2819 | if (am_guest_unpriv()) |
ee484f7f CB |
2820 | ret = userns_exec_full(conf, lxc_rmdir_onedev_wrapper, path, |
2821 | "lxc_rmdir_onedev_wrapper"); | |
4355ab5f | 2822 | else |
18aa217b | 2823 | ret = lxc_rmdir_onedev(path, "snaps"); |
4355ab5f | 2824 | if (ret < 0) { |
17a367d8 CB |
2825 | ERROR("Failed to destroy directory \"%s\" for \"%s\"", path, |
2826 | c->name); | |
60bf62d4 SH |
2827 | goto out; |
2828 | } | |
17a367d8 | 2829 | INFO("Destroyed directory \"%s\" for \"%s\"", path, c->name); |
297c2d58 | 2830 | |
fef48dc9 | 2831 | bret = true; |
60bf62d4 SH |
2832 | |
2833 | out: | |
17a367d8 CB |
2834 | if (path) |
2835 | free(path); | |
3bc449ed | 2836 | container_disk_unlock(c); |
fef48dc9 | 2837 | return bret; |
72d0e1cb SG |
2838 | } |
2839 | ||
858377e4 | 2840 | static bool do_lxcapi_destroy(struct lxc_container *c) |
18aa217b SH |
2841 | { |
2842 | if (!c || !lxcapi_is_defined(c)) | |
2843 | return false; | |
2844 | if (has_snapshots(c)) { | |
2845 | ERROR("Container %s has snapshots; not removing", c->name); | |
2846 | return false; | |
2847 | } | |
2848 | ||
2849 | if (has_fs_snapshots(c)) { | |
2850 | ERROR("container %s has snapshots on its rootfs", c->name); | |
2851 | return false; | |
2852 | } | |
2853 | ||
17a367d8 | 2854 | return container_destroy(c, NULL); |
18aa217b SH |
2855 | } |
2856 | ||
858377e4 | 2857 | WRAP_API(bool, lxcapi_destroy) |
18aa217b | 2858 | |
858377e4 | 2859 | static bool do_lxcapi_destroy_with_snapshots(struct lxc_container *c) |
18aa217b SH |
2860 | { |
2861 | if (!c || !lxcapi_is_defined(c)) | |
2862 | return false; | |
2863 | if (!lxcapi_snapshot_destroy_all(c)) { | |
2864 | ERROR("Error deleting all snapshots"); | |
2865 | return false; | |
2866 | } | |
2867 | return lxcapi_destroy(c); | |
2868 | } | |
2869 | ||
858377e4 SH |
2870 | WRAP_API(bool, lxcapi_destroy_with_snapshots) |
2871 | ||
0d9cd9c3 CB |
2872 | int lxc_set_config_item_locked(struct lxc_conf *conf, const char *key, |
2873 | const char *v) | |
96532523 | 2874 | { |
0d9cd9c3 | 2875 | int ret; |
96532523 | 2876 | struct lxc_config_t *config; |
0d9cd9c3 CB |
2877 | bool bret = true; |
2878 | ||
2879 | config = lxc_get_config(key); | |
2880 | if (!config) | |
2881 | return -EINVAL; | |
2882 | ||
2883 | ret = config->set(key, v, conf, NULL); | |
2884 | if (ret < 0) | |
2885 | return -EINVAL; | |
2886 | ||
2887 | if (lxc_config_value_empty(v)) | |
2888 | do_clear_unexp_config_line(conf, key); | |
2889 | else | |
2890 | bret = do_append_unexp_config_line(conf, key, v); | |
2891 | if (!bret) | |
2892 | return -ENOMEM; | |
2893 | ||
2894 | return 0; | |
2895 | } | |
2896 | ||
2897 | static bool do_set_config_item_locked(struct lxc_container *c, const char *key, | |
2898 | const char *v) | |
2899 | { | |
2900 | int ret; | |
96532523 SH |
2901 | |
2902 | if (!c->lxc_conf) | |
2903 | c->lxc_conf = lxc_conf_init(); | |
4222a9f4 | 2904 | |
6b0d5538 | 2905 | if (!c->lxc_conf) |
96532523 | 2906 | return false; |
4222a9f4 | 2907 | |
0d9cd9c3 CB |
2908 | ret = lxc_set_config_item_locked(c->lxc_conf, key, v); |
2909 | if (ret < 0) | |
f979ac15 | 2910 | return false; |
4222a9f4 | 2911 | |
0d9cd9c3 | 2912 | return true; |
96532523 SH |
2913 | } |
2914 | ||
858377e4 | 2915 | static bool do_lxcapi_set_config_item(struct lxc_container *c, const char *key, const char *v) |
72d0e1cb | 2916 | { |
72d0e1cb | 2917 | bool b = false; |
72d0e1cb SG |
2918 | |
2919 | if (!c) | |
2920 | return false; | |
2921 | ||
5cee8c50 | 2922 | if (container_mem_lock(c)) |
72d0e1cb SG |
2923 | return false; |
2924 | ||
0d9cd9c3 | 2925 | b = do_set_config_item_locked(c, key, v); |
72d0e1cb | 2926 | |
5cee8c50 | 2927 | container_mem_unlock(c); |
72d0e1cb SG |
2928 | return b; |
2929 | } | |
2930 | ||
858377e4 SH |
2931 | WRAP_API_2(bool, lxcapi_set_config_item, const char *, const char *) |
2932 | ||
72d0e1cb SG |
2933 | static char *lxcapi_config_file_name(struct lxc_container *c) |
2934 | { | |
2935 | if (!c || !c->configfile) | |
2936 | return NULL; | |
2937 | return strdup(c->configfile); | |
2938 | } | |
2939 | ||
2a59a681 SH |
2940 | static const char *lxcapi_get_config_path(struct lxc_container *c) |
2941 | { | |
2942 | if (!c || !c->config_path) | |
2943 | return NULL; | |
2944 | return (const char *)(c->config_path); | |
2945 | } | |
2946 | ||
afeecbba SH |
2947 | /* |
2948 | * not for export | |
2949 | * Just recalculate the c->configfile based on the | |
2950 | * c->config_path, which must be set. | |
2951 | * The lxc_container must be locked or not yet public. | |
2952 | */ | |
2953 | static bool set_config_filename(struct lxc_container *c) | |
2954 | { | |
2955 | char *newpath; | |
2956 | int len, ret; | |
2957 | ||
2958 | if (!c->config_path) | |
2959 | return false; | |
2960 | ||
2961 | /* $lxc_path + "/" + c->name + "/" + "config" + '\0' */ | |
2962 | len = strlen(c->config_path) + strlen(c->name) + strlen("config") + 3; | |
2963 | newpath = malloc(len); | |
2964 | if (!newpath) | |
2965 | return false; | |
2966 | ||
2967 | ret = snprintf(newpath, len, "%s/%s/config", c->config_path, c->name); | |
2968 | if (ret < 0 || ret >= len) { | |
2969 | fprintf(stderr, "Error printing out config file name\n"); | |
2970 | free(newpath); | |
2971 | return false; | |
2972 | } | |
2973 | ||
f10fad2f | 2974 | free(c->configfile); |
afeecbba SH |
2975 | c->configfile = newpath; |
2976 | ||
2977 | return true; | |
2978 | } | |
2979 | ||
858377e4 | 2980 | static bool do_lxcapi_set_config_path(struct lxc_container *c, const char *path) |
2a59a681 SH |
2981 | { |
2982 | char *p; | |
2983 | bool b = false; | |
afeecbba | 2984 | char *oldpath = NULL; |
2a59a681 SH |
2985 | |
2986 | if (!c) | |
2987 | return b; | |
2988 | ||
5cee8c50 | 2989 | if (container_mem_lock(c)) |
2a59a681 SH |
2990 | return b; |
2991 | ||
2992 | p = strdup(path); | |
afeecbba SH |
2993 | if (!p) { |
2994 | ERROR("Out of memory setting new lxc path"); | |
2a59a681 | 2995 | goto err; |
afeecbba SH |
2996 | } |
2997 | ||
2a59a681 SH |
2998 | b = true; |
2999 | if (c->config_path) | |
afeecbba | 3000 | oldpath = c->config_path; |
2a59a681 | 3001 | c->config_path = p; |
afeecbba SH |
3002 | |
3003 | /* Since we've changed the config path, we have to change the | |
3004 | * config file name too */ | |
3005 | if (!set_config_filename(c)) { | |
3006 | ERROR("Out of memory setting new config filename"); | |
3007 | b = false; | |
3008 | free(c->config_path); | |
3009 | c->config_path = oldpath; | |
3010 | oldpath = NULL; | |
3011 | } | |
2a59a681 | 3012 | err: |
f10fad2f | 3013 | free(oldpath); |
5cee8c50 | 3014 | container_mem_unlock(c); |
2a59a681 SH |
3015 | return b; |
3016 | } | |
3017 | ||
858377e4 | 3018 | WRAP_API_1(bool, lxcapi_set_config_path, const char *) |
2a59a681 | 3019 | |
858377e4 | 3020 | static bool do_lxcapi_set_cgroup_item(struct lxc_container *c, const char *subsys, const char *value) |
794dd120 SH |
3021 | { |
3022 | int ret; | |
794dd120 SH |
3023 | |
3024 | if (!c) | |
3025 | return false; | |
3026 | ||
3bc449ed | 3027 | if (is_stopped(c)) |
794dd120 SH |
3028 | return false; |
3029 | ||
3bc449ed SH |
3030 | if (container_disk_lock(c)) |
3031 | return false; | |
794dd120 | 3032 | |
33ad9f1a | 3033 | ret = lxc_cgroup_set(subsys, value, c->name, c->config_path); |
3bc449ed SH |
3034 | |
3035 | container_disk_unlock(c); | |
3036 | return ret == 0; | |
794dd120 SH |
3037 | } |
3038 | ||
858377e4 SH |
3039 | WRAP_API_2(bool, lxcapi_set_cgroup_item, const char *, const char *) |
3040 | ||
3041 | static int do_lxcapi_get_cgroup_item(struct lxc_container *c, const char *subsys, char *retv, int inlen) | |
794dd120 | 3042 | { |
3bc449ed | 3043 | int ret; |
794dd120 | 3044 | |
6502006a | 3045 | if (!c) |
794dd120 SH |
3046 | return -1; |
3047 | ||
3bc449ed | 3048 | if (is_stopped(c)) |
794dd120 SH |
3049 | return -1; |
3050 | ||
3bc449ed SH |
3051 | if (container_disk_lock(c)) |
3052 | return -1; | |
794dd120 | 3053 | |
33ad9f1a | 3054 | ret = lxc_cgroup_get(subsys, retv, inlen, c->name, c->config_path); |
794dd120 | 3055 | |
3bc449ed | 3056 | container_disk_unlock(c); |
794dd120 SH |
3057 | return ret; |
3058 | } | |
3059 | ||
858377e4 SH |
3060 | WRAP_API_3(int, lxcapi_get_cgroup_item, const char *, char *, int) |
3061 | ||
593e8478 | 3062 | const char *lxc_get_global_config_item(const char *key) |
83c98d82 | 3063 | { |
593e8478 | 3064 | return lxc_global_config_value(key); |
a8428dfa SH |
3065 | } |
3066 | ||
b6b918a1 SG |
3067 | const char *lxc_get_version(void) |
3068 | { | |
95ee490b | 3069 | return LXC_VERSION; |
b6b918a1 SG |
3070 | } |
3071 | ||
f0ca2726 | 3072 | static int copy_file(const char *old, const char *new) |
9be53773 SH |
3073 | { |
3074 | int in, out; | |
3075 | ssize_t len, ret; | |
3076 | char buf[8096]; | |
3077 | struct stat sbuf; | |
3078 | ||
3079 | if (file_exists(new)) { | |
3080 | ERROR("copy destination %s exists", new); | |
3081 | return -1; | |
3082 | } | |
3083 | ret = stat(old, &sbuf); | |
3084 | if (ret < 0) { | |
dfb31b25 | 3085 | INFO("Error stat'ing %s", old); |
9be53773 SH |
3086 | return -1; |
3087 | } | |
3088 | ||
3089 | in = open(old, O_RDONLY); | |
3090 | if (in < 0) { | |
dfb31b25 | 3091 | SYSERROR("Error opening original file %s", old); |
9be53773 SH |
3092 | return -1; |
3093 | } | |
3094 | out = open(new, O_CREAT | O_EXCL | O_WRONLY, 0644); | |
3095 | if (out < 0) { | |
dfb31b25 | 3096 | SYSERROR("Error opening new file %s", new); |
9be53773 SH |
3097 | close(in); |
3098 | return -1; | |
3099 | } | |
3100 | ||
3101 | while (1) { | |
3102 | len = read(in, buf, 8096); | |
3103 | if (len < 0) { | |
dfb31b25 | 3104 | SYSERROR("Error reading old file %s", old); |
9be53773 SH |
3105 | goto err; |
3106 | } | |
3107 | if (len == 0) | |
3108 | break; | |
3109 | ret = write(out, buf, len); | |
1a0e70ac | 3110 | if (ret < len) { /* should we retry? */ |
dfb31b25 | 3111 | SYSERROR("Error: write to new file %s was interrupted", new); |
9be53773 SH |
3112 | goto err; |
3113 | } | |
3114 | } | |
3115 | close(in); | |
3116 | close(out); | |
3117 | ||
1a0e70ac | 3118 | /* We set mode, but not owner/group. */ |
9be53773 SH |
3119 | ret = chmod(new, sbuf.st_mode); |
3120 | if (ret) { | |
dfb31b25 | 3121 | SYSERROR("Error setting mode on %s", new); |
9be53773 SH |
3122 | return -1; |
3123 | } | |
3124 | ||
3125 | return 0; | |
3126 | ||
3127 | err: | |
3128 | close(in); | |
3129 | close(out); | |
3130 | return -1; | |
3131 | } | |
3132 | ||
9be53773 SH |
3133 | static int copyhooks(struct lxc_container *oldc, struct lxc_container *c) |
3134 | { | |
619256b5 | 3135 | int i, len, ret; |
9be53773 | 3136 | struct lxc_list *it; |
619256b5 ÇO |
3137 | char *cpath; |
3138 | ||
3139 | len = strlen(oldc->config_path) + strlen(oldc->name) + 3; | |
3140 | cpath = alloca(len); | |
3141 | ret = snprintf(cpath, len, "%s/%s/", oldc->config_path, oldc->name); | |
3142 | if (ret < 0 || ret >= len) | |
3143 | return -1; | |
9be53773 SH |
3144 | |
3145 | for (i=0; i<NUM_LXC_HOOKS; i++) { | |
3146 | lxc_list_for_each(it, &c->lxc_conf->hooks[i]) { | |
3147 | char *hookname = it->elem; | |
c32981c3 | 3148 | char *fname = strrchr(hookname, '/'); |
9be53773 | 3149 | char tmppath[MAXPATHLEN]; |
1a0e70ac | 3150 | if (!fname) /* relative path - we don't support, but maybe we should */ |
9be53773 | 3151 | return 0; |
619256b5 | 3152 | if (strncmp(hookname, cpath, len - 1) != 0) { |
1a0e70ac | 3153 | /* this hook is public - ignore */ |
619256b5 ÇO |
3154 | continue; |
3155 | } | |
1a0e70ac | 3156 | /* copy the script, and change the entry in confile */ |
9be53773 SH |
3157 | ret = snprintf(tmppath, MAXPATHLEN, "%s/%s/%s", |
3158 | c->config_path, c->name, fname+1); | |
3159 | if (ret < 0 || ret >= MAXPATHLEN) | |
3160 | return -1; | |
3161 | ret = copy_file(it->elem, tmppath); | |
3162 | if (ret < 0) | |
3163 | return -1; | |
3164 | free(it->elem); | |
3165 | it->elem = strdup(tmppath); | |
3166 | if (!it->elem) { | |
3167 | ERROR("out of memory copying hook path"); | |
3168 | return -1; | |
3169 | } | |
9be53773 SH |
3170 | } |
3171 | } | |
3172 | ||
67702c21 SH |
3173 | if (!clone_update_unexp_hooks(c->lxc_conf, oldc->config_path, |
3174 | c->config_path, oldc->name, c->name)) { | |
6b0d5538 SH |
3175 | ERROR("Error saving new hooks in clone"); |
3176 | return -1; | |
3177 | } | |
858377e4 | 3178 | do_lxcapi_save_config(c, NULL); |
9be53773 SH |
3179 | return 0; |
3180 | } | |
3181 | ||
9be53773 SH |
3182 | |
3183 | static int copy_fstab(struct lxc_container *oldc, struct lxc_container *c) | |
3184 | { | |
3185 | char newpath[MAXPATHLEN]; | |
3186 | char *oldpath = oldc->lxc_conf->fstab; | |
3187 | int ret; | |
3188 | ||
3189 | if (!oldpath) | |
3190 | return 0; | |
3191 | ||
47148e96 CB |
3192 | clear_unexp_config_line(c->lxc_conf, "lxc.mount.fstab", false); |
3193 | ||
c32981c3 | 3194 | char *p = strrchr(oldpath, '/'); |
9be53773 SH |
3195 | if (!p) |
3196 | return -1; | |
3197 | ret = snprintf(newpath, MAXPATHLEN, "%s/%s%s", | |
3198 | c->config_path, c->name, p); | |
3199 | if (ret < 0 || ret >= MAXPATHLEN) { | |
3200 | ERROR("error printing new path for %s", oldpath); | |
3201 | return -1; | |
3202 | } | |
3203 | if (file_exists(newpath)) { | |
3204 | ERROR("error: fstab file %s exists", newpath); | |
3205 | return -1; | |
3206 | } | |
3207 | ||
3208 | if (copy_file(oldpath, newpath) < 0) { | |
3209 | ERROR("error: copying %s to %s", oldpath, newpath); | |
3210 | return -1; | |
3211 | } | |
3212 | free(c->lxc_conf->fstab); | |
3213 | c->lxc_conf->fstab = strdup(newpath); | |
3214 | if (!c->lxc_conf->fstab) { | |
3215 | ERROR("error: allocating pathname"); | |
3216 | return -1; | |
3217 | } | |
47148e96 | 3218 | if (!do_append_unexp_config_line(c->lxc_conf, "lxc.mount.fstab", newpath)) { |
6b0d5538 SH |
3219 | ERROR("error saving new lxctab"); |
3220 | return -1; | |
3221 | } | |
9be53773 SH |
3222 | |
3223 | return 0; | |
3224 | } | |
3225 | ||
dfb31b25 SH |
3226 | static void copy_rdepends(struct lxc_container *c, struct lxc_container *c0) |
3227 | { | |
3228 | char path0[MAXPATHLEN], path1[MAXPATHLEN]; | |
3229 | int ret; | |
3230 | ||
3231 | ret = snprintf(path0, MAXPATHLEN, "%s/%s/lxc_rdepends", c0->config_path, | |
3232 | c0->name); | |
3233 | if (ret < 0 || ret >= MAXPATHLEN) { | |
3234 | WARN("Error copying reverse dependencies"); | |
3235 | return; | |
3236 | } | |
3237 | ret = snprintf(path1, MAXPATHLEN, "%s/%s/lxc_rdepends", c->config_path, | |
3238 | c->name); | |
3239 | if (ret < 0 || ret >= MAXPATHLEN) { | |
3240 | WARN("Error copying reverse dependencies"); | |
3241 | return; | |
3242 | } | |
3243 | if (copy_file(path0, path1) < 0) { | |
3244 | INFO("Error copying reverse dependencies"); | |
3245 | return; | |
3246 | } | |
3247 | } | |
3248 | ||
3249 | static bool add_rdepends(struct lxc_container *c, struct lxc_container *c0) | |
3250 | { | |
3251 | int ret; | |
3252 | char path[MAXPATHLEN]; | |
3253 | FILE *f; | |
3254 | bool bret; | |
3255 | ||
3256 | ret = snprintf(path, MAXPATHLEN, "%s/%s/lxc_rdepends", c->config_path, | |
3257 | c->name); | |
3258 | if (ret < 0 || ret >= MAXPATHLEN) | |
3259 | return false; | |
3260 | f = fopen(path, "a"); | |
3261 | if (!f) | |
3262 | return false; | |
3263 | bret = true; | |
1a0e70ac | 3264 | /* If anything goes wrong, just return an error. */ |
dfb31b25 SH |
3265 | if (fprintf(f, "%s\n%s\n", c0->config_path, c0->name) < 0) |
3266 | bret = false; | |
3267 | if (fclose(f) != 0) | |
3268 | bret = false; | |
3269 | return bret; | |
3270 | } | |
3271 | ||
15a90a10 SH |
3272 | /* |
3273 | * If the fs natively supports snapshot clones with no penalty, | |
3274 | * then default to those even if not requested. | |
3275 | * Currently we only do this for btrfs. | |
3276 | */ | |
3277 | bool should_default_to_snapshot(struct lxc_container *c0, | |
3278 | struct lxc_container *c1) | |
3279 | { | |
3280 | size_t l0 = strlen(c0->config_path) + strlen(c0->name) + 2; | |
3281 | size_t l1 = strlen(c1->config_path) + strlen(c1->name) + 2; | |
3282 | char *p0 = alloca(l0 + 1); | |
3283 | char *p1 = alloca(l1 + 1); | |
6e0fa6a0 | 3284 | char *rootfs = c0->lxc_conf->rootfs.path; |
15a90a10 SH |
3285 | |
3286 | snprintf(p0, l0, "%s/%s", c0->config_path, c0->name); | |
3287 | snprintf(p1, l1, "%s/%s", c1->config_path, c1->name); | |
9a09badc CB |
3288 | |
3289 | if (!is_btrfs_fs(p0) || !is_btrfs_fs(p1)) | |
3290 | return false; | |
3291 | ||
6e0fa6a0 CB |
3292 | if (is_btrfs_subvol(rootfs) <= 0) |
3293 | return false; | |
3294 | ||
15a90a10 SH |
3295 | return btrfs_same_fs(p0, p1) == 0; |
3296 | } | |
3297 | ||
9be53773 | 3298 | static int copy_storage(struct lxc_container *c0, struct lxc_container *c, |
763429b6 CB |
3299 | const char *newtype, int flags, const char *bdevdata, |
3300 | uint64_t newsize) | |
9be53773 | 3301 | { |
10bc1861 | 3302 | struct lxc_storage *bdev; |
07db51a2 | 3303 | bool need_rdep; |
9be53773 | 3304 | |
15a90a10 SH |
3305 | if (should_default_to_snapshot(c0, c)) |
3306 | flags |= LXC_CLONE_SNAPSHOT; | |
3307 | ||
10bc1861 CB |
3308 | bdev = storage_copy(c0, c->name, c->config_path, newtype, flags, |
3309 | bdevdata, newsize, &need_rdep); | |
9be53773 | 3310 | if (!bdev) { |
763429b6 | 3311 | ERROR("Error copying storage."); |
9be53773 SH |
3312 | return -1; |
3313 | } | |
763429b6 CB |
3314 | |
3315 | /* Set new rootfs. */ | |
9be53773 SH |
3316 | free(c->lxc_conf->rootfs.path); |
3317 | c->lxc_conf->rootfs.path = strdup(bdev->src); | |
10bc1861 | 3318 | storage_put(bdev); |
763429b6 | 3319 | |
dfb31b25 | 3320 | if (!c->lxc_conf->rootfs.path) { |
763429b6 CB |
3321 | ERROR("Out of memory while setting storage path."); |
3322 | return -1; | |
3323 | } | |
763429b6 | 3324 | |
7a96a068 CB |
3325 | /* Append a new lxc.rootfs.path entry to the unexpanded config. */ |
3326 | clear_unexp_config_line(c->lxc_conf, "lxc.rootfs.path", false); | |
3327 | if (!do_append_unexp_config_line(c->lxc_conf, "lxc.rootfs.path", | |
763429b6 CB |
3328 | c->lxc_conf->rootfs.path)) { |
3329 | ERROR("Error saving new rootfs to cloned config."); | |
d0218321 SH |
3330 | return -1; |
3331 | } | |
763429b6 | 3332 | |
eee59f94 SH |
3333 | if (flags & LXC_CLONE_SNAPSHOT) |
3334 | copy_rdepends(c, c0); | |
dfb31b25 SH |
3335 | if (need_rdep) { |
3336 | if (!add_rdepends(c, c0)) | |
3337 | WARN("Error adding reverse dependency from %s to %s", | |
763429b6 | 3338 | c->name, c0->name); |
dfb31b25 SH |
3339 | } |
3340 | ||
3341 | mod_all_rdeps(c, true); | |
3342 | ||
9be53773 SH |
3343 | return 0; |
3344 | } | |
3345 | ||
1354955b SH |
3346 | struct clone_update_data { |
3347 | struct lxc_container *c0; | |
3348 | struct lxc_container *c1; | |
3349 | int flags; | |
3350 | char **hookargs; | |
3351 | }; | |
3352 | ||
3353 | static int clone_update_rootfs(struct clone_update_data *data) | |
9be53773 | 3354 | { |
1354955b SH |
3355 | struct lxc_container *c0 = data->c0; |
3356 | struct lxc_container *c = data->c1; | |
3357 | int flags = data->flags; | |
3358 | char **hookargs = data->hookargs; | |
9be53773 SH |
3359 | int ret = -1; |
3360 | char path[MAXPATHLEN]; | |
10bc1861 | 3361 | struct lxc_storage *bdev; |
9be53773 | 3362 | FILE *fout; |
148e91f5 | 3363 | struct lxc_conf *conf = c->lxc_conf; |
9be53773 SH |
3364 | |
3365 | /* update hostname in rootfs */ | |
3366 | /* we're going to mount, so run in a clean namespace to simplify cleanup */ | |
3367 | ||
1354955b SH |
3368 | if (setgid(0) < 0) { |
3369 | ERROR("Failed to setgid to 0"); | |
3370 | return -1; | |
3371 | } | |
3372 | if (setuid(0) < 0) { | |
3373 | ERROR("Failed to setuid to 0"); | |
9be53773 | 3374 | return -1; |
1354955b | 3375 | } |
c476bdce SH |
3376 | if (setgroups(0, NULL) < 0) |
3377 | WARN("Failed to clear groups"); | |
9be53773 | 3378 | |
1354955b SH |
3379 | if (unshare(CLONE_NEWNS) < 0) |
3380 | return -1; | |
8a388ed4 | 3381 | bdev = storage_init(c->lxc_conf); |
9be53773 | 3382 | if (!bdev) |
1354955b | 3383 | return -1; |
cf3ef16d SH |
3384 | if (strcmp(bdev->type, "dir") != 0) { |
3385 | if (unshare(CLONE_NEWNS) < 0) { | |
3386 | ERROR("error unsharing mounts"); | |
10bc1861 | 3387 | storage_put(bdev); |
1354955b | 3388 | return -1; |
cf3ef16d | 3389 | } |
2c6f3fc9 SH |
3390 | if (detect_shared_rootfs()) { |
3391 | if (mount(NULL, "/", NULL, MS_SLAVE|MS_REC, NULL)) { | |
3392 | SYSERROR("Failed to make / rslave"); | |
3393 | ERROR("Continuing..."); | |
3394 | } | |
3395 | } | |
e7de366c | 3396 | if (bdev->ops->mount(bdev) < 0) { |
10bc1861 | 3397 | storage_put(bdev); |
1354955b | 3398 | return -1; |
e7de366c | 3399 | } |
1a0e70ac | 3400 | } else { /* TODO come up with a better way */ |
f10fad2f | 3401 | free(bdev->dest); |
cf3ef16d SH |
3402 | bdev->dest = strdup(bdev->src); |
3403 | } | |
148e91f5 SH |
3404 | |
3405 | if (!lxc_list_empty(&conf->hooks[LXCHOOK_CLONE])) { | |
3406 | /* Start of environment variable setup for hooks */ | |
ab7efcf5 | 3407 | if (c0->name && setenv("LXC_SRC_NAME", c0->name, 1)) { |
1143ed39 DE |
3408 | SYSERROR("failed to set environment variable for source container name"); |
3409 | } | |
cb8ff4d0 | 3410 | if (setenv("LXC_NAME", c->name, 1)) { |
148e91f5 SH |
3411 | SYSERROR("failed to set environment variable for container name"); |
3412 | } | |
ab7efcf5 | 3413 | if (conf->rcfile && setenv("LXC_CONFIG_FILE", conf->rcfile, 1)) { |
148e91f5 SH |
3414 | SYSERROR("failed to set environment variable for config path"); |
3415 | } | |
ab7efcf5 | 3416 | if (bdev->dest && setenv("LXC_ROOTFS_MOUNT", bdev->dest, 1)) { |
148e91f5 SH |
3417 | SYSERROR("failed to set environment variable for rootfs mount"); |
3418 | } | |
ab7efcf5 | 3419 | if (conf->rootfs.path && setenv("LXC_ROOTFS_PATH", conf->rootfs.path, 1)) { |
148e91f5 SH |
3420 | SYSERROR("failed to set environment variable for rootfs mount"); |
3421 | } | |
3422 | ||
14a7b0f9 | 3423 | if (run_lxc_hooks(c->name, "clone", conf, hookargs)) { |
148e91f5 | 3424 | ERROR("Error executing clone hook for %s", c->name); |
10bc1861 | 3425 | storage_put(bdev); |
1354955b | 3426 | return -1; |
148e91f5 SH |
3427 | } |
3428 | } | |
3429 | ||
3430 | if (!(flags & LXC_CLONE_KEEPNAME)) { | |
3431 | ret = snprintf(path, MAXPATHLEN, "%s/etc/hostname", bdev->dest); | |
10bc1861 | 3432 | storage_put(bdev); |
e7de366c | 3433 | |
148e91f5 | 3434 | if (ret < 0 || ret >= MAXPATHLEN) |
1354955b | 3435 | return -1; |
8058be39 | 3436 | if (!file_exists(path)) |
1354955b | 3437 | return 0; |
148e91f5 | 3438 | if (!(fout = fopen(path, "w"))) { |
959aee9c | 3439 | SYSERROR("unable to open %s: ignoring", path); |
1354955b | 3440 | return 0; |
148e91f5 | 3441 | } |
a684f0b7 ÇO |
3442 | if (fprintf(fout, "%s", c->name) < 0) { |
3443 | fclose(fout); | |
1354955b | 3444 | return -1; |
6849cb5b | 3445 | } |
148e91f5 | 3446 | if (fclose(fout) < 0) |
1354955b | 3447 | return -1; |
10bc1861 CB |
3448 | } else { |
3449 | storage_put(bdev); | |
9be53773 | 3450 | } |
e7de366c | 3451 | |
1354955b SH |
3452 | return 0; |
3453 | } | |
3454 | ||
3455 | static int clone_update_rootfs_wrapper(void *data) | |
3456 | { | |
3457 | struct clone_update_data *arg = (struct clone_update_data *) data; | |
3458 | return clone_update_rootfs(arg); | |
9be53773 SH |
3459 | } |
3460 | ||
3461 | /* | |
3462 | * We want to support: | |
3463 | sudo lxc-clone -o o1 -n n1 -s -L|-fssize fssize -v|--vgname vgname \ | |
3464 | -p|--lvprefix lvprefix -t|--fstype fstype -B backingstore | |
3465 | ||
ba115175 CB |
3466 | -s [ implies overlay] |
3467 | -s -B overlay | |
9be53773 SH |
3468 | -s -B aufs |
3469 | ||
3470 | only rootfs gets converted (copied/snapshotted) on clone. | |
3471 | */ | |
3472 | ||
d5752559 | 3473 | static int create_file_dirname(char *path, struct lxc_conf *conf) |
9be53773 | 3474 | { |
c32981c3 | 3475 | char *p = strrchr(path, '/'); |
d5752559 | 3476 | int ret = -1; |
9be53773 SH |
3477 | |
3478 | if (!p) | |
3479 | return -1; | |
3480 | *p = '\0'; | |
d028235d | 3481 | ret = do_create_container_dir(path, conf); |
9be53773 SH |
3482 | *p = '/'; |
3483 | return ret; | |
3484 | } | |
3485 | ||
858377e4 | 3486 | static struct lxc_container *do_lxcapi_clone(struct lxc_container *c, const char *newname, |
9be53773 | 3487 | const char *lxcpath, int flags, |
d659597e | 3488 | const char *bdevtype, const char *bdevdata, uint64_t newsize, |
148e91f5 | 3489 | char **hookargs) |
9be53773 | 3490 | { |
9be53773 | 3491 | char newpath[MAXPATHLEN]; |
17a367d8 | 3492 | int ret; |
1354955b | 3493 | struct clone_update_data data; |
3b392519 | 3494 | size_t saved_unexp_len; |
9be53773 | 3495 | FILE *fout; |
1354955b | 3496 | pid_t pid; |
17a367d8 CB |
3497 | int storage_copied = 0; |
3498 | char *origroot = NULL, *saved_unexp_conf = NULL; | |
3499 | struct lxc_container *c2 = NULL; | |
9be53773 | 3500 | |
858377e4 | 3501 | if (!c || !do_lxcapi_is_defined(c)) |
9be53773 SH |
3502 | return NULL; |
3503 | ||
5cee8c50 | 3504 | if (container_mem_lock(c)) |
9be53773 SH |
3505 | return NULL; |
3506 | ||
39dc698c | 3507 | if (!is_stopped(c)) { |
9be53773 SH |
3508 | ERROR("error: Original container (%s) is running", c->name); |
3509 | goto out; | |
3510 | } | |
3511 | ||
1a0e70ac | 3512 | /* Make sure the container doesn't yet exist. */ |
05d53f4c SH |
3513 | if (!newname) |
3514 | newname = c->name; | |
3515 | if (!lxcpath) | |
858377e4 | 3516 | lxcpath = do_lxcapi_get_config_path(c); |
05d53f4c | 3517 | ret = snprintf(newpath, MAXPATHLEN, "%s/%s/config", lxcpath, newname); |
6849cb5b | 3518 | if (ret < 0 || ret >= MAXPATHLEN) { |
9be53773 SH |
3519 | SYSERROR("clone: failed making config pathname"); |
3520 | goto out; | |
3521 | } | |
17a367d8 | 3522 | |
9be53773 SH |
3523 | if (file_exists(newpath)) { |
3524 | ERROR("error: clone: %s exists", newpath); | |
3525 | goto out; | |
3526 | } | |
3527 | ||
d5752559 | 3528 | ret = create_file_dirname(newpath, c->lxc_conf); |
96532523 | 3529 | if (ret < 0 && errno != EEXIST) { |
9be53773 SH |
3530 | ERROR("Error creating container dir for %s", newpath); |
3531 | goto out; | |
3532 | } | |
3533 | ||
1a0e70ac | 3534 | /* Copy the configuration. Tweak it as needed. */ |
8d2efe40 SH |
3535 | if (c->lxc_conf->rootfs.path) { |
3536 | origroot = c->lxc_conf->rootfs.path; | |
3537 | c->lxc_conf->rootfs.path = NULL; | |
3538 | } | |
9be53773 SH |
3539 | fout = fopen(newpath, "w"); |
3540 | if (!fout) { | |
3541 | SYSERROR("open %s", newpath); | |
3542 | goto out; | |
3543 | } | |
5eea90e8 SH |
3544 | |
3545 | saved_unexp_conf = c->lxc_conf->unexpanded_config; | |
3b392519 | 3546 | saved_unexp_len = c->lxc_conf->unexpanded_len; |
5eea90e8 SH |
3547 | c->lxc_conf->unexpanded_config = strdup(saved_unexp_conf); |
3548 | if (!c->lxc_conf->unexpanded_config) { | |
3549 | ERROR("Out of memory"); | |
7d72b959 | 3550 | fclose(fout); |
5eea90e8 SH |
3551 | goto out; |
3552 | } | |
7a96a068 | 3553 | |
7a96a068 | 3554 | clear_unexp_config_line(c->lxc_conf, "lxc.rootfs.path", false); |
6b0d5538 | 3555 | write_config(fout, c->lxc_conf); |
9be53773 | 3556 | fclose(fout); |
8d2efe40 | 3557 | c->lxc_conf->rootfs.path = origroot; |
5eea90e8 SH |
3558 | free(c->lxc_conf->unexpanded_config); |
3559 | c->lxc_conf->unexpanded_config = saved_unexp_conf; | |
3560 | saved_unexp_conf = NULL; | |
3b392519 | 3561 | c->lxc_conf->unexpanded_len = saved_unexp_len; |
9be53773 | 3562 | |
90b366fc CB |
3563 | ret = snprintf(newpath, MAXPATHLEN, "%s/%s/rootfs", lxcpath, newname); |
3564 | if (ret < 0 || ret >= MAXPATHLEN) { | |
3565 | SYSERROR("clone: failed making rootfs pathname"); | |
3566 | goto out; | |
3567 | } | |
17a367d8 CB |
3568 | |
3569 | ret = mkdir(newpath, 0755); | |
3570 | if (ret < 0) { | |
3571 | /* For an overlay container the rootfs is considered immutable | |
3572 | * and will not have been removed when restoring from a | |
3573 | * snapshot. | |
3574 | */ | |
3575 | if (errno != ENOENT && | |
3576 | !(flags & LXC_STORAGE_INTERNAL_OVERLAY_RESTORE)) { | |
3577 | SYSERROR("Failed to create directory \"%s\"", newpath); | |
3578 | goto out; | |
3579 | } | |
9be53773 SH |
3580 | } |
3581 | ||
e0010464 | 3582 | if (am_guest_unpriv()) { |
1354955b | 3583 | if (chown_mapped_root(newpath, c->lxc_conf) < 0) { |
959aee9c | 3584 | ERROR("Error chowning %s to container root", newpath); |
1354955b SH |
3585 | goto out; |
3586 | } | |
3587 | } | |
3588 | ||
05d53f4c | 3589 | c2 = lxc_container_new(newname, lxcpath); |
375c2258 | 3590 | if (!c2) { |
05d53f4c SH |
3591 | ERROR("clone: failed to create new container (%s %s)", newname, |
3592 | lxcpath); | |
9be53773 SH |
3593 | goto out; |
3594 | } | |
8d2efe40 | 3595 | |
1a0e70ac | 3596 | /* copy/snapshot rootfs's */ |
8d2efe40 SH |
3597 | ret = copy_storage(c, c2, bdevtype, flags, bdevdata, newsize); |
3598 | if (ret < 0) | |
3599 | goto out; | |
9be53773 | 3600 | |
6b0d5538 | 3601 | |
1a0e70ac | 3602 | /* update utsname */ |
3d7ad474 CB |
3603 | if (!(flags & LXC_CLONE_KEEPNAME)) { |
3604 | clear_unexp_config_line(c2->lxc_conf, "lxc.utsname", false); | |
b67771bc | 3605 | clear_unexp_config_line(c2->lxc_conf, "lxc.uts.name", false); |
3d7ad474 | 3606 | |
0d9cd9c3 | 3607 | if (!do_set_config_item_locked(c2, "lxc.uts.name", newname)) { |
3d7ad474 CB |
3608 | ERROR("Error setting new hostname"); |
3609 | goto out; | |
3610 | } | |
96532523 SH |
3611 | } |
3612 | ||
1a0e70ac | 3613 | /* copy hooks */ |
619256b5 ÇO |
3614 | ret = copyhooks(c, c2); |
3615 | if (ret < 0) { | |
3616 | ERROR("error copying hooks"); | |
3617 | goto out; | |
9be53773 SH |
3618 | } |
3619 | ||
3620 | if (copy_fstab(c, c2) < 0) { | |
3621 | ERROR("error copying fstab"); | |
9be53773 SH |
3622 | goto out; |
3623 | } | |
3624 | ||
1a0e70ac | 3625 | /* update macaddrs */ |
6b0d5538 | 3626 | if (!(flags & LXC_CLONE_KEEPMACADDR)) { |
67702c21 SH |
3627 | if (!network_new_hwaddrs(c2->lxc_conf)) { |
3628 | ERROR("Error updating mac addresses"); | |
6b0d5538 SH |
3629 | goto out; |
3630 | } | |
3631 | } | |
9be53773 | 3632 | |
1a0e70ac | 3633 | /* Update absolute paths for overlay mount directories. */ |
83e79752 | 3634 | if (ovl_update_abs_paths(c2->lxc_conf, c->config_path, c->name, lxcpath, newname) < 0) |
030ce9a9 CB |
3635 | goto out; |
3636 | ||
1a0e70ac CB |
3637 | /* We've now successfully created c2's storage, so clear it out if we |
3638 | * fail after this. | |
3639 | */ | |
176d9acb SH |
3640 | storage_copied = 1; |
3641 | ||
375c2258 | 3642 | if (!c2->save_config(c2, NULL)) |
9be53773 | 3643 | goto out; |
9be53773 | 3644 | |
1354955b SH |
3645 | if ((pid = fork()) < 0) { |
3646 | SYSERROR("fork"); | |
9be53773 | 3647 | goto out; |
1354955b SH |
3648 | } |
3649 | if (pid > 0) { | |
3650 | ret = wait_for_pid(pid); | |
3651 | if (ret) | |
3652 | goto out; | |
3653 | container_mem_unlock(c); | |
3654 | return c2; | |
3655 | } | |
3656 | data.c0 = c; | |
3657 | data.c1 = c2; | |
3658 | data.flags = flags; | |
3659 | data.hookargs = hookargs; | |
e0010464 | 3660 | if (am_guest_unpriv()) |
ee484f7f CB |
3661 | ret = userns_exec_full(c->lxc_conf, clone_update_rootfs_wrapper, |
3662 | &data, "clone_update_rootfs_wrapper"); | |
1354955b SH |
3663 | else |
3664 | ret = clone_update_rootfs(&data); | |
3665 | if (ret < 0) | |
3666 | exit(1); | |
9be53773 | 3667 | |
5cee8c50 | 3668 | container_mem_unlock(c); |
1354955b | 3669 | exit(0); |
9be53773 SH |
3670 | |
3671 | out: | |
5cee8c50 | 3672 | container_mem_unlock(c); |
375c2258 | 3673 | if (c2) { |
176d9acb SH |
3674 | if (!storage_copied) |
3675 | c2->lxc_conf->rootfs.path = NULL; | |
375c2258 | 3676 | c2->destroy(c2); |
9be53773 | 3677 | lxc_container_put(c2); |
375c2258 | 3678 | } |
9be53773 SH |
3679 | |
3680 | return NULL; | |
3681 | } | |
3682 | ||
858377e4 SH |
3683 | static struct lxc_container *lxcapi_clone(struct lxc_container *c, const char *newname, |
3684 | const char *lxcpath, int flags, | |
3685 | const char *bdevtype, const char *bdevdata, uint64_t newsize, | |
3686 | char **hookargs) | |
3687 | { | |
3688 | struct lxc_container * ret; | |
3689 | current_config = c ? c->lxc_conf : NULL; | |
3690 | ret = do_lxcapi_clone(c, newname, lxcpath, flags, bdevtype, bdevdata, newsize, hookargs); | |
3691 | current_config = NULL; | |
3692 | return ret; | |
3693 | } | |
3694 | ||
3695 | static bool do_lxcapi_rename(struct lxc_container *c, const char *newname) | |
06e5650e | 3696 | { |
10bc1861 | 3697 | struct lxc_storage *bdev; |
06e5650e | 3698 | struct lxc_container *newc; |
06e5650e | 3699 | |
d693cf93 | 3700 | if (!c || !c->name || !c->config_path || !c->lxc_conf) |
06e5650e ÇO |
3701 | return false; |
3702 | ||
18aa217b SH |
3703 | if (has_fs_snapshots(c) || has_snapshots(c)) { |
3704 | ERROR("Renaming a container with snapshots is not supported"); | |
3705 | return false; | |
3706 | } | |
8a388ed4 | 3707 | bdev = storage_init(c->lxc_conf); |
06e5650e ÇO |
3708 | if (!bdev) { |
3709 | ERROR("Failed to find original backing store type"); | |
3710 | return false; | |
3711 | } | |
3712 | ||
619256b5 | 3713 | newc = lxcapi_clone(c, newname, c->config_path, LXC_CLONE_KEEPMACADDR, NULL, bdev->type, 0, NULL); |
10bc1861 | 3714 | storage_put(bdev); |
06e5650e ÇO |
3715 | if (!newc) { |
3716 | lxc_container_put(newc); | |
3717 | return false; | |
3718 | } | |
3719 | ||
3720 | if (newc && lxcapi_is_defined(newc)) | |
3721 | lxc_container_put(newc); | |
3722 | ||
17a367d8 | 3723 | if (!container_destroy(c, NULL)) { |
06e5650e ÇO |
3724 | ERROR("Could not destroy existing container %s", c->name); |
3725 | return false; | |
3726 | } | |
3727 | return true; | |
3728 | } | |
3729 | ||
858377e4 SH |
3730 | WRAP_API_1(bool, lxcapi_rename, const char *) |
3731 | ||
a0e93eeb CS |
3732 | 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) |
3733 | { | |
858377e4 SH |
3734 | int ret; |
3735 | ||
a0e93eeb CS |
3736 | if (!c) |
3737 | return -1; | |
3738 | ||
858377e4 SH |
3739 | current_config = c->lxc_conf; |
3740 | ||
3741 | ret = lxc_attach(c->name, c->config_path, exec_function, exec_payload, options, attached_process); | |
3742 | current_config = NULL; | |
3743 | return ret; | |
a0e93eeb CS |
3744 | } |
3745 | ||
858377e4 | 3746 | 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 |
3747 | { |
3748 | lxc_attach_command_t command; | |
3749 | pid_t pid; | |
3750 | int r; | |
3751 | ||
3752 | if (!c) | |
3753 | return -1; | |
3754 | ||
3755 | command.program = (char*)program; | |
3756 | command.argv = (char**)argv; | |
3757 | r = lxc_attach(c->name, c->config_path, lxc_attach_run_command, &command, options, &pid); | |
3758 | if (r < 0) { | |
3759 | ERROR("ups"); | |
3760 | return r; | |
3761 | } | |
3762 | return lxc_wait_for_pid_status(pid); | |
3763 | } | |
3764 | ||
858377e4 SH |
3765 | static int lxcapi_attach_run_wait(struct lxc_container *c, lxc_attach_options_t *options, const char *program, const char * const argv[]) |
3766 | { | |
3767 | int ret; | |
3768 | current_config = c ? c->lxc_conf : NULL; | |
3769 | ret = do_lxcapi_attach_run_wait(c, options, program, argv); | |
3770 | current_config = NULL; | |
3771 | return ret; | |
3772 | } | |
3773 | ||
74a3920a | 3774 | static int get_next_index(const char *lxcpath, char *cname) |
f5dd1d53 SH |
3775 | { |
3776 | char *fname; | |
3777 | struct stat sb; | |
3778 | int i = 0, ret; | |
3779 | ||
3780 | fname = alloca(strlen(lxcpath) + 20); | |
3781 | while (1) { | |
3782 | sprintf(fname, "%s/snap%d", lxcpath, i); | |
3783 | ret = stat(fname, &sb); | |
3784 | if (ret != 0) | |
3785 | return i; | |
3786 | i++; | |
3787 | } | |
3788 | } | |
3789 | ||
18aa217b SH |
3790 | static bool get_snappath_dir(struct lxc_container *c, char *snappath) |
3791 | { | |
3792 | int ret; | |
3793 | /* | |
3794 | * If the old style snapshot path exists, use it | |
3795 | * /var/lib/lxc -> /var/lib/lxcsnaps | |
3796 | */ | |
3797 | ret = snprintf(snappath, MAXPATHLEN, "%ssnaps", c->config_path); | |
3798 | if (ret < 0 || ret >= MAXPATHLEN) | |
3799 | return false; | |
3800 | if (dir_exists(snappath)) { | |
3801 | ret = snprintf(snappath, MAXPATHLEN, "%ssnaps/%s", c->config_path, c->name); | |
3802 | if (ret < 0 || ret >= MAXPATHLEN) | |
3803 | return false; | |
3804 | return true; | |
3805 | } | |
3806 | ||
3807 | /* | |
3808 | * Use the new style path | |
3809 | * /var/lib/lxc -> /var/lib/lxc + c->name + /snaps + \0 | |
3810 | */ | |
3811 | ret = snprintf(snappath, MAXPATHLEN, "%s/%s/snaps", c->config_path, c->name); | |
3812 | if (ret < 0 || ret >= MAXPATHLEN) | |
3813 | return false; | |
3814 | return true; | |
3815 | } | |
3816 | ||
858377e4 | 3817 | static int do_lxcapi_snapshot(struct lxc_container *c, const char *commentfile) |
f5dd1d53 SH |
3818 | { |
3819 | int i, flags, ret; | |
3820 | struct lxc_container *c2; | |
3821 | char snappath[MAXPATHLEN], newname[20]; | |
3822 | ||
840f05df SH |
3823 | if (!c || !lxcapi_is_defined(c)) |
3824 | return -1; | |
3825 | ||
10bc1861 | 3826 | if (!storage_can_backup(c->lxc_conf)) { |
cdd01be2 SH |
3827 | ERROR("%s's backing store cannot be backed up.", c->name); |
3828 | ERROR("Your container must use another backing store type."); | |
3829 | return -1; | |
3830 | } | |
3831 | ||
18aa217b | 3832 | if (!get_snappath_dir(c, snappath)) |
f5dd1d53 | 3833 | return -1; |
18aa217b | 3834 | |
f5dd1d53 SH |
3835 | i = get_next_index(snappath, c->name); |
3836 | ||
3837 | if (mkdir_p(snappath, 0755) < 0) { | |
3838 | ERROR("Failed to create snapshot directory %s", snappath); | |
3839 | return -1; | |
3840 | } | |
3841 | ||
3842 | ret = snprintf(newname, 20, "snap%d", i); | |
3843 | if (ret < 0 || ret >= 20) | |
3844 | return -1; | |
3845 | ||
0a83cbbb SH |
3846 | /* |
3847 | * We pass LXC_CLONE_SNAPSHOT to make sure that a rdepends file entry is | |
3848 | * created in the original container | |
3849 | */ | |
3850 | flags = LXC_CLONE_SNAPSHOT | LXC_CLONE_KEEPMACADDR | LXC_CLONE_KEEPNAME | | |
3851 | LXC_CLONE_KEEPBDEVTYPE | LXC_CLONE_MAYBE_SNAPSHOT; | |
068aa488 | 3852 | if (storage_is_dir(c->lxc_conf)) { |
8c39f7a4 SH |
3853 | ERROR("Snapshot of directory-backed container requested."); |
3854 | ERROR("Making a copy-clone. If you do want snapshots, then"); | |
ba115175 | 3855 | ERROR("please create an aufs or overlay clone first, snapshot that"); |
8c39f7a4 SH |
3856 | ERROR("and keep the original container pristine."); |
3857 | flags &= ~LXC_CLONE_SNAPSHOT | LXC_CLONE_MAYBE_SNAPSHOT; | |
3858 | } | |
858377e4 | 3859 | c2 = do_lxcapi_clone(c, newname, snappath, flags, NULL, NULL, 0, NULL); |
f5dd1d53 | 3860 | if (!c2) { |
959aee9c | 3861 | ERROR("clone of %s:%s failed", c->config_path, c->name); |
f5dd1d53 SH |
3862 | return -1; |
3863 | } | |
3864 | ||
3865 | lxc_container_put(c2); | |
3866 | ||
1a0e70ac | 3867 | /* Now write down the creation time. */ |
f5dd1d53 SH |
3868 | time_t timer; |
3869 | char buffer[25]; | |
3870 | struct tm* tm_info; | |
025ed0f3 | 3871 | FILE *f; |
f5dd1d53 SH |
3872 | |
3873 | time(&timer); | |
3874 | tm_info = localtime(&timer); | |
3875 | ||
3876 | strftime(buffer, 25, "%Y:%m:%d %H:%M:%S", tm_info); | |
3877 | ||
3878 | char *dfnam = alloca(strlen(snappath) + strlen(newname) + 5); | |
3879 | sprintf(dfnam, "%s/%s/ts", snappath, newname); | |
025ed0f3 | 3880 | f = fopen(dfnam, "w"); |
f5dd1d53 | 3881 | if (!f) { |
959aee9c | 3882 | ERROR("Failed to open %s", dfnam); |
f5dd1d53 SH |
3883 | return -1; |
3884 | } | |
3885 | if (fprintf(f, "%s", buffer) < 0) { | |
3886 | SYSERROR("Writing timestamp"); | |
3887 | fclose(f); | |
3888 | return -1; | |
3889 | } | |
025ed0f3 | 3890 | ret = fclose(f); |
025ed0f3 | 3891 | if (ret != 0) { |
f5dd1d53 SH |
3892 | SYSERROR("Writing timestamp"); |
3893 | return -1; | |
3894 | } | |
3895 | ||
3896 | if (commentfile) { | |
1a0e70ac | 3897 | /* $p / $name / comment \0 */ |
f5dd1d53 SH |
3898 | int len = strlen(snappath) + strlen(newname) + 10; |
3899 | char *path = alloca(len); | |
3900 | sprintf(path, "%s/%s/comment", snappath, newname); | |
3901 | return copy_file(commentfile, path) < 0 ? -1 : i; | |
3902 | } | |
3903 | ||
3904 | return i; | |
3905 | } | |
3906 | ||
858377e4 SH |
3907 | WRAP_API_1(int, lxcapi_snapshot, const char *) |
3908 | ||
f5dd1d53 SH |
3909 | static void lxcsnap_free(struct lxc_snapshot *s) |
3910 | { | |
f10fad2f ME |
3911 | free(s->name); |
3912 | free(s->comment_pathname); | |
3913 | free(s->timestamp); | |
3914 | free(s->lxcpath); | |
f5dd1d53 SH |
3915 | } |
3916 | ||
3917 | static char *get_snapcomment_path(char* snappath, char *name) | |
3918 | { | |
1a0e70ac | 3919 | /* $snappath/$name/comment */ |
f5dd1d53 SH |
3920 | int ret, len = strlen(snappath) + strlen(name) + 10; |
3921 | char *s = malloc(len); | |
3922 | ||
3923 | if (s) { | |
3924 | ret = snprintf(s, len, "%s/%s/comment", snappath, name); | |
3925 | if (ret < 0 || ret >= len) { | |
3926 | free(s); | |
3927 | s = NULL; | |
3928 | } | |
3929 | } | |
3930 | return s; | |
3931 | } | |
3932 | ||
3933 | static char *get_timestamp(char* snappath, char *name) | |
3934 | { | |
3935 | char path[MAXPATHLEN], *s = NULL; | |
3936 | int ret, len; | |
3937 | FILE *fin; | |
3938 | ||
3939 | ret = snprintf(path, MAXPATHLEN, "%s/%s/ts", snappath, name); | |
3940 | if (ret < 0 || ret >= MAXPATHLEN) | |
3941 | return NULL; | |
025ed0f3 | 3942 | fin = fopen(path, "r"); |
025ed0f3 | 3943 | if (!fin) |
f5dd1d53 SH |
3944 | return NULL; |
3945 | (void) fseek(fin, 0, SEEK_END); | |
3946 | len = ftell(fin); | |
3947 | (void) fseek(fin, 0, SEEK_SET); | |
3948 | if (len > 0) { | |
3949 | s = malloc(len+1); | |
3950 | if (s) { | |
3951 | s[len] = '\0'; | |
3952 | if (fread(s, 1, len, fin) != len) { | |
3953 | SYSERROR("reading timestamp"); | |
3954 | free(s); | |
3955 | s = NULL; | |
3956 | } | |
3957 | } | |
3958 | } | |
3959 | fclose(fin); | |
3960 | return s; | |
3961 | } | |
3962 | ||
858377e4 | 3963 | static int do_lxcapi_snapshot_list(struct lxc_container *c, struct lxc_snapshot **ret_snaps) |
f5dd1d53 SH |
3964 | { |
3965 | char snappath[MAXPATHLEN], path2[MAXPATHLEN]; | |
18aa217b | 3966 | int count = 0, ret; |
74f96976 | 3967 | struct dirent *direntp; |
f5dd1d53 SH |
3968 | struct lxc_snapshot *snaps =NULL, *nsnaps; |
3969 | DIR *dir; | |
3970 | ||
3971 | if (!c || !lxcapi_is_defined(c)) | |
3972 | return -1; | |
c868b261 | 3973 | |
18aa217b | 3974 | if (!get_snappath_dir(c, snappath)) { |
f5dd1d53 SH |
3975 | ERROR("path name too long"); |
3976 | return -1; | |
3977 | } | |
025ed0f3 | 3978 | dir = opendir(snappath); |
025ed0f3 | 3979 | if (!dir) { |
f5dd1d53 SH |
3980 | INFO("failed to open %s - assuming no snapshots", snappath); |
3981 | return 0; | |
3982 | } | |
3983 | ||
74f96976 | 3984 | while ((direntp = readdir(dir))) { |
f5dd1d53 SH |
3985 | if (!direntp) |
3986 | break; | |
3987 | ||
3988 | if (!strcmp(direntp->d_name, ".")) | |
3989 | continue; | |
3990 | ||
3991 | if (!strcmp(direntp->d_name, "..")) | |
3992 | continue; | |
3993 | ||
3994 | ret = snprintf(path2, MAXPATHLEN, "%s/%s/config", snappath, direntp->d_name); | |
3995 | if (ret < 0 || ret >= MAXPATHLEN) { | |
3996 | ERROR("pathname too long"); | |
3997 | goto out_free; | |
3998 | } | |
3999 | if (!file_exists(path2)) | |
4000 | continue; | |
4001 | nsnaps = realloc(snaps, (count + 1)*sizeof(*snaps)); | |
4002 | if (!nsnaps) { | |
4003 | SYSERROR("Out of memory"); | |
4004 | goto out_free; | |
4005 | } | |
4006 | snaps = nsnaps; | |
4007 | snaps[count].free = lxcsnap_free; | |
4008 | snaps[count].name = strdup(direntp->d_name); | |
4009 | if (!snaps[count].name) | |
4010 | goto out_free; | |
4011 | snaps[count].lxcpath = strdup(snappath); | |
4012 | if (!snaps[count].lxcpath) { | |
4013 | free(snaps[count].name); | |
4014 | goto out_free; | |
4015 | } | |
4016 | snaps[count].comment_pathname = get_snapcomment_path(snappath, direntp->d_name); | |
4017 | snaps[count].timestamp = get_timestamp(snappath, direntp->d_name); | |
4018 | count++; | |
4019 | } | |
4020 | ||
4021 | if (closedir(dir)) | |
4022 | WARN("failed to close directory"); | |
4023 | ||
4024 | *ret_snaps = snaps; | |
4025 | return count; | |
4026 | ||
4027 | out_free: | |
4028 | if (snaps) { | |
4029 | int i; | |
4030 | for (i=0; i<count; i++) | |
4031 | lxcsnap_free(&snaps[i]); | |
4032 | free(snaps); | |
4033 | } | |
9baa57bd SH |
4034 | if (closedir(dir)) |
4035 | WARN("failed to close directory"); | |
f5dd1d53 SH |
4036 | return -1; |
4037 | } | |
4038 | ||
858377e4 SH |
4039 | WRAP_API_1(int, lxcapi_snapshot_list, struct lxc_snapshot **) |
4040 | ||
4041 | static bool do_lxcapi_snapshot_restore(struct lxc_container *c, const char *snapname, const char *newname) | |
f5dd1d53 SH |
4042 | { |
4043 | char clonelxcpath[MAXPATHLEN]; | |
18aa217b | 4044 | int flags = 0; |
f5dd1d53 | 4045 | struct lxc_container *snap, *rest; |
10bc1861 | 4046 | struct lxc_storage *bdev; |
f5dd1d53 SH |
4047 | bool b = false; |
4048 | ||
4049 | if (!c || !c->name || !c->config_path) | |
4050 | return false; | |
4051 | ||
18aa217b SH |
4052 | if (has_fs_snapshots(c)) { |
4053 | ERROR("container rootfs has dependent snapshots"); | |
4054 | return false; | |
4055 | } | |
4056 | ||
8a388ed4 | 4057 | bdev = storage_init(c->lxc_conf); |
f5dd1d53 SH |
4058 | if (!bdev) { |
4059 | ERROR("Failed to find original backing store type"); | |
4060 | return false; | |
4061 | } | |
4062 | ||
17a367d8 CB |
4063 | /* For an overlay container the rootfs is considered immutable |
4064 | * and cannot be removed when restoring from a snapshot. We pass this | |
4065 | * internal flag along to communicate this to various parts of the | |
4066 | * codebase. | |
4067 | */ | |
4068 | if (!strcmp(bdev->type, "overlay") || !strcmp(bdev->type, "overlayfs")) | |
4069 | bdev->flags |= LXC_STORAGE_INTERNAL_OVERLAY_RESTORE; | |
4070 | ||
f5dd1d53 SH |
4071 | if (!newname) |
4072 | newname = c->name; | |
7e36f87e | 4073 | |
18aa217b | 4074 | if (!get_snappath_dir(c, clonelxcpath)) { |
10bc1861 | 4075 | storage_put(bdev); |
f5dd1d53 SH |
4076 | return false; |
4077 | } | |
1a0e70ac | 4078 | /* how should we lock this? */ |
f5dd1d53 SH |
4079 | |
4080 | snap = lxc_container_new(snapname, clonelxcpath); | |
4081 | if (!snap || !lxcapi_is_defined(snap)) { | |
4082 | ERROR("Could not open snapshot %s", snapname); | |
17a367d8 CB |
4083 | if (snap) |
4084 | lxc_container_put(snap); | |
10bc1861 | 4085 | storage_put(bdev); |
f5dd1d53 SH |
4086 | return false; |
4087 | } | |
4088 | ||
17a367d8 CB |
4089 | if (!strcmp(c->name, newname)) { |
4090 | if (!container_destroy(c, bdev)) { | |
7e36f87e ÇO |
4091 | ERROR("Could not destroy existing container %s", newname); |
4092 | lxc_container_put(snap); | |
10bc1861 | 4093 | storage_put(bdev); |
7e36f87e ÇO |
4094 | return false; |
4095 | } | |
4096 | } | |
4097 | ||
de269ee8 SH |
4098 | if (strcmp(bdev->type, "dir") != 0 && strcmp(bdev->type, "loop") != 0) |
4099 | flags = LXC_CLONE_SNAPSHOT | LXC_CLONE_MAYBE_SNAPSHOT; | |
17a367d8 CB |
4100 | |
4101 | if (!strcmp(bdev->type, "overlay") || !strcmp(bdev->type, "overlayfs")) | |
4102 | flags |= LXC_STORAGE_INTERNAL_OVERLAY_RESTORE; | |
09f6f8c4 CB |
4103 | rest = lxcapi_clone(snap, newname, c->config_path, flags, bdev->type, |
4104 | NULL, 0, NULL); | |
10bc1861 | 4105 | storage_put(bdev); |
f5dd1d53 SH |
4106 | if (rest && lxcapi_is_defined(rest)) |
4107 | b = true; | |
4108 | if (rest) | |
4109 | lxc_container_put(rest); | |
17a367d8 | 4110 | |
f5dd1d53 SH |
4111 | lxc_container_put(snap); |
4112 | return b; | |
4113 | } | |
4114 | ||
858377e4 SH |
4115 | WRAP_API_2(bool, lxcapi_snapshot_restore, const char *, const char *) |
4116 | ||
18aa217b | 4117 | static bool do_snapshot_destroy(const char *snapname, const char *clonelxcpath) |
771d96b3 | 4118 | { |
771d96b3 | 4119 | struct lxc_container *snap = NULL; |
18aa217b | 4120 | bool bret = false; |
771d96b3 ÇO |
4121 | |
4122 | snap = lxc_container_new(snapname, clonelxcpath); | |
18aa217b | 4123 | if (!snap) { |
771d96b3 ÇO |
4124 | ERROR("Could not find snapshot %s", snapname); |
4125 | goto err; | |
4126 | } | |
4127 | ||
858377e4 | 4128 | if (!do_lxcapi_destroy(snap)) { |
771d96b3 ÇO |
4129 | ERROR("Could not destroy snapshot %s", snapname); |
4130 | goto err; | |
4131 | } | |
18aa217b | 4132 | bret = true; |
771d96b3 | 4133 | |
771d96b3 ÇO |
4134 | err: |
4135 | if (snap) | |
4136 | lxc_container_put(snap); | |
18aa217b SH |
4137 | return bret; |
4138 | } | |
4139 | ||
4140 | static bool remove_all_snapshots(const char *path) | |
4141 | { | |
4142 | DIR *dir; | |
74f96976 | 4143 | struct dirent *direntp; |
18aa217b SH |
4144 | bool bret = true; |
4145 | ||
4146 | dir = opendir(path); | |
4147 | if (!dir) { | |
4148 | SYSERROR("opendir on snapshot path %s", path); | |
4149 | return false; | |
4150 | } | |
74f96976 | 4151 | while ((direntp = readdir(dir))) { |
18aa217b SH |
4152 | if (!strcmp(direntp->d_name, ".")) |
4153 | continue; | |
4154 | if (!strcmp(direntp->d_name, "..")) | |
4155 | continue; | |
4156 | if (!do_snapshot_destroy(direntp->d_name, path)) { | |
4157 | bret = false; | |
4158 | continue; | |
4159 | } | |
4160 | } | |
4161 | ||
4162 | closedir(dir); | |
4163 | ||
4164 | if (rmdir(path)) | |
4165 | SYSERROR("Error removing directory %s", path); | |
4166 | ||
4167 | return bret; | |
4168 | } | |
4169 | ||
858377e4 | 4170 | static bool do_lxcapi_snapshot_destroy(struct lxc_container *c, const char *snapname) |
18aa217b SH |
4171 | { |
4172 | char clonelxcpath[MAXPATHLEN]; | |
4173 | ||
4174 | if (!c || !c->name || !c->config_path || !snapname) | |
4175 | return false; | |
4176 | ||
4177 | if (!get_snappath_dir(c, clonelxcpath)) | |
4178 | return false; | |
4179 | ||
4180 | return do_snapshot_destroy(snapname, clonelxcpath); | |
4181 | } | |
4182 | ||
858377e4 SH |
4183 | WRAP_API_1(bool, lxcapi_snapshot_destroy, const char *) |
4184 | ||
4185 | static bool do_lxcapi_snapshot_destroy_all(struct lxc_container *c) | |
18aa217b SH |
4186 | { |
4187 | char clonelxcpath[MAXPATHLEN]; | |
4188 | ||
4189 | if (!c || !c->name || !c->config_path) | |
4190 | return false; | |
4191 | ||
4192 | if (!get_snappath_dir(c, clonelxcpath)) | |
4193 | return false; | |
4194 | ||
4195 | return remove_all_snapshots(clonelxcpath); | |
771d96b3 ÇO |
4196 | } |
4197 | ||
858377e4 SH |
4198 | WRAP_API(bool, lxcapi_snapshot_destroy_all) |
4199 | ||
4200 | static bool do_lxcapi_may_control(struct lxc_container *c) | |
b494d2dd SH |
4201 | { |
4202 | return lxc_try_cmd(c->name, c->config_path) == 0; | |
4203 | } | |
4204 | ||
858377e4 SH |
4205 | WRAP_API(bool, lxcapi_may_control) |
4206 | ||
d5aa23e6 | 4207 | static bool do_add_remove_node(pid_t init_pid, const char *path, bool add, |
b69dfc9f | 4208 | struct stat *st) |
d5aa23e6 | 4209 | { |
b69dfc9f CB |
4210 | int ret; |
4211 | char *tmp; | |
4212 | pid_t pid; | |
d5aa23e6 SH |
4213 | char chrootpath[MAXPATHLEN]; |
4214 | char *directory_path = NULL; | |
d5aa23e6 | 4215 | |
b69dfc9f CB |
4216 | pid = fork(); |
4217 | if (pid < 0) { | |
4218 | SYSERROR("Failed to fork()"); | |
d5aa23e6 SH |
4219 | return false; |
4220 | } | |
b69dfc9f | 4221 | |
d5aa23e6 | 4222 | if (pid) { |
b69dfc9f CB |
4223 | ret = wait_for_pid(pid); |
4224 | if (ret != 0) { | |
4225 | ERROR("Failed to create device node"); | |
d5aa23e6 SH |
4226 | return false; |
4227 | } | |
b69dfc9f | 4228 | |
d5aa23e6 SH |
4229 | return true; |
4230 | } | |
4231 | ||
4232 | /* prepare the path */ | |
4233 | ret = snprintf(chrootpath, MAXPATHLEN, "/proc/%d/root", init_pid); | |
4234 | if (ret < 0 || ret >= MAXPATHLEN) | |
4235 | return false; | |
4236 | ||
b69dfc9f CB |
4237 | ret = chroot(chrootpath); |
4238 | if (ret < 0) | |
4239 | exit(EXIT_FAILURE); | |
4240 | ||
4241 | ret = chdir("/"); | |
4242 | if (ret < 0) | |
4243 | exit(EXIT_FAILURE); | |
4244 | ||
d5aa23e6 | 4245 | /* remove path if it exists */ |
b69dfc9f CB |
4246 | ret = faccessat(AT_FDCWD, path, F_OK, AT_SYMLINK_NOFOLLOW); |
4247 | if(ret == 0) { | |
4248 | ret = unlink(path); | |
c7d76c09 CB |
4249 | if (ret < 0) { |
4250 | ERROR("%s - Failed to remove \"%s\"", strerror(errno), path); | |
b69dfc9f | 4251 | exit(EXIT_FAILURE); |
c7d76c09 | 4252 | } |
d5aa23e6 | 4253 | } |
b69dfc9f | 4254 | |
d5aa23e6 | 4255 | if (!add) |
b69dfc9f | 4256 | exit(EXIT_SUCCESS); |
d5aa23e6 SH |
4257 | |
4258 | /* create any missing directories */ | |
b69dfc9f CB |
4259 | tmp = strdup(path); |
4260 | if (!tmp) | |
4261 | exit(EXIT_FAILURE); | |
4262 | ||
4263 | directory_path = dirname(tmp); | |
4264 | ret = mkdir_p(directory_path, 0755); | |
4265 | if (ret < 0 && errno != EEXIST) { | |
c7d76c09 | 4266 | ERROR("%s - Failed to create path \"%s\"", strerror(errno), directory_path); |
b69dfc9f CB |
4267 | free(tmp); |
4268 | exit(EXIT_FAILURE); | |
d5aa23e6 SH |
4269 | } |
4270 | ||
4271 | /* create the device node */ | |
b69dfc9f CB |
4272 | ret = mknod(path, st->st_mode, st->st_rdev); |
4273 | free(tmp); | |
c7d76c09 CB |
4274 | if (ret < 0) { |
4275 | ERROR("%s - Failed to create device node at \"%s\"", strerror(errno), path); | |
b69dfc9f | 4276 | exit(EXIT_FAILURE); |
c7d76c09 | 4277 | } |
d5aa23e6 | 4278 | |
b69dfc9f | 4279 | exit(EXIT_SUCCESS); |
d5aa23e6 SH |
4280 | } |
4281 | ||
f0ca2726 | 4282 | static bool add_remove_device_node(struct lxc_container *c, const char *src_path, const char *dest_path, bool add) |
a9a0ed90 ÇO |
4283 | { |
4284 | int ret; | |
4285 | struct stat st; | |
a9a0ed90 | 4286 | char value[MAX_BUFFER]; |
f0ca2726 | 4287 | const char *p; |
a9a0ed90 ÇO |
4288 | |
4289 | /* make sure container is running */ | |
858377e4 | 4290 | if (!do_lxcapi_is_running(c)) { |
a9a0ed90 | 4291 | ERROR("container is not running"); |
d5aa23e6 | 4292 | return false; |
a9a0ed90 ÇO |
4293 | } |
4294 | ||
4295 | /* use src_path if dest_path is NULL otherwise use dest_path */ | |
4296 | p = dest_path ? dest_path : src_path; | |
4297 | ||
a9a0ed90 ÇO |
4298 | /* make sure we can access p */ |
4299 | if(access(p, F_OK) < 0 || stat(p, &st) < 0) | |
d5aa23e6 | 4300 | return false; |
a9a0ed90 ÇO |
4301 | |
4302 | /* continue if path is character device or block device */ | |
c6a9b0d7 | 4303 | if (S_ISCHR(st.st_mode)) |
a9a0ed90 | 4304 | ret = snprintf(value, MAX_BUFFER, "c %d:%d rwm", major(st.st_rdev), minor(st.st_rdev)); |
c6a9b0d7 | 4305 | else if (S_ISBLK(st.st_mode)) |
a9a0ed90 ÇO |
4306 | ret = snprintf(value, MAX_BUFFER, "b %d:%d rwm", major(st.st_rdev), minor(st.st_rdev)); |
4307 | else | |
d5aa23e6 | 4308 | return false; |
a9a0ed90 ÇO |
4309 | |
4310 | /* check snprintf return code */ | |
4311 | if (ret < 0 || ret >= MAX_BUFFER) | |
d5aa23e6 | 4312 | return false; |
a9a0ed90 | 4313 | |
858377e4 | 4314 | if (!do_add_remove_node(do_lxcapi_init_pid(c), p, add, &st)) |
d5aa23e6 | 4315 | return false; |
a9a0ed90 | 4316 | |
d5aa23e6 | 4317 | /* add or remove device to/from cgroup access list */ |
a9a0ed90 | 4318 | if (add) { |
858377e4 | 4319 | if (!do_lxcapi_set_cgroup_item(c, "devices.allow", value)) { |
a9a0ed90 | 4320 | ERROR("set_cgroup_item failed while adding the device node"); |
d5aa23e6 | 4321 | return false; |
a9a0ed90 ÇO |
4322 | } |
4323 | } else { | |
858377e4 | 4324 | if (!do_lxcapi_set_cgroup_item(c, "devices.deny", value)) { |
a9a0ed90 | 4325 | ERROR("set_cgroup_item failed while removing the device node"); |
d5aa23e6 | 4326 | return false; |
a9a0ed90 ÇO |
4327 | } |
4328 | } | |
d5aa23e6 | 4329 | |
a9a0ed90 | 4330 | return true; |
a9a0ed90 ÇO |
4331 | } |
4332 | ||
858377e4 | 4333 | static bool do_lxcapi_add_device_node(struct lxc_container *c, const char *src_path, const char *dest_path) |
a9a0ed90 | 4334 | { |
e0010464 | 4335 | // cannot mknod if we're not privileged wrt init_user_ns |
5384e99d | 4336 | if (am_host_unpriv()) { |
c868b261 ÇO |
4337 | ERROR(NOT_SUPPORTED_ERROR, __FUNCTION__); |
4338 | return false; | |
4339 | } | |
a9a0ed90 ÇO |
4340 | return add_remove_device_node(c, src_path, dest_path, true); |
4341 | } | |
4342 | ||
858377e4 SH |
4343 | WRAP_API_2(bool, lxcapi_add_device_node, const char *, const char *) |
4344 | ||
4345 | static bool do_lxcapi_remove_device_node(struct lxc_container *c, const char *src_path, const char *dest_path) | |
a9a0ed90 | 4346 | { |
e0010464 | 4347 | if (am_guest_unpriv()) { |
c868b261 ÇO |
4348 | ERROR(NOT_SUPPORTED_ERROR, __FUNCTION__); |
4349 | return false; | |
4350 | } | |
a9a0ed90 ÇO |
4351 | return add_remove_device_node(c, src_path, dest_path, false); |
4352 | } | |
4353 | ||
858377e4 SH |
4354 | WRAP_API_2(bool, lxcapi_remove_device_node, const char *, const char *) |
4355 | ||
c7d76c09 CB |
4356 | static bool do_lxcapi_attach_interface(struct lxc_container *c, |
4357 | const char *ifname, | |
4358 | const char *dst_ifname) | |
e58fae8f | 4359 | { |
c7d76c09 | 4360 | pid_t init_pid; |
e58fae8f | 4361 | int ret = 0; |
c7d76c09 | 4362 | |
e0010464 | 4363 | if (am_guest_unpriv()) { |
e58fae8f DY |
4364 | ERROR(NOT_SUPPORTED_ERROR, __FUNCTION__); |
4365 | return false; | |
4366 | } | |
4367 | ||
4368 | if (!ifname) { | |
4369 | ERROR("No source interface name given"); | |
4370 | return false; | |
4371 | } | |
4372 | ||
4373 | ret = lxc_netdev_isup(ifname); | |
e5848d39 SH |
4374 | if (ret > 0) { |
4375 | /* netdev of ifname is up. */ | |
e58fae8f DY |
4376 | ret = lxc_netdev_down(ifname); |
4377 | if (ret) | |
4378 | goto err; | |
4379 | } | |
4380 | ||
c7d76c09 CB |
4381 | init_pid = do_lxcapi_init_pid(c); |
4382 | ret = lxc_netdev_move_by_name(ifname, init_pid, dst_ifname); | |
e58fae8f DY |
4383 | if (ret) |
4384 | goto err; | |
4385 | ||
c7d76c09 | 4386 | INFO("Moved network device \"%s\" to network namespace of %d", ifname, init_pid); |
e58fae8f | 4387 | return true; |
e5848d39 | 4388 | |
e58fae8f | 4389 | err: |
e58fae8f DY |
4390 | return false; |
4391 | } | |
4392 | ||
858377e4 SH |
4393 | WRAP_API_2(bool, lxcapi_attach_interface, const char *, const char *) |
4394 | ||
c7d76c09 CB |
4395 | static bool do_lxcapi_detach_interface(struct lxc_container *c, |
4396 | const char *ifname, | |
4397 | const char *dst_ifname) | |
e58fae8f | 4398 | { |
c7d76c09 | 4399 | int ret; |
e58fae8f DY |
4400 | pid_t pid, pid_outside; |
4401 | ||
e0010464 SH |
4402 | /* |
4403 | * TODO - if this is a physical device, then we need am_host_unpriv. | |
4404 | * But for other types guest privilege suffices. | |
4405 | */ | |
4406 | if (am_guest_unpriv()) { | |
e58fae8f DY |
4407 | ERROR(NOT_SUPPORTED_ERROR, __FUNCTION__); |
4408 | return false; | |
4409 | } | |
4410 | ||
4411 | if (!ifname) { | |
4412 | ERROR("No source interface name given"); | |
4413 | return false; | |
4414 | } | |
4415 | ||
0059379f | 4416 | pid_outside = lxc_raw_getpid(); |
e58fae8f DY |
4417 | pid = fork(); |
4418 | if (pid < 0) { | |
c7d76c09 | 4419 | ERROR("Failed to fork"); |
e58fae8f DY |
4420 | return false; |
4421 | } | |
4422 | ||
1a0e70ac | 4423 | if (pid == 0) { /* child */ |
acbfeda8 CB |
4424 | pid_t init_pid; |
4425 | ||
4426 | init_pid = do_lxcapi_init_pid(c); | |
4427 | if (!switch_to_ns(init_pid, "net")) { | |
4428 | ERROR("Failed to enter network namespace"); | |
4429 | exit(EXIT_FAILURE); | |
e58fae8f DY |
4430 | } |
4431 | ||
4432 | ret = lxc_netdev_isup(ifname); | |
c7d76c09 CB |
4433 | if (ret < 0) { |
4434 | ERROR("Failed to determine whether network device \"%s\" is up", ifname); | |
4435 | exit(EXIT_FAILURE); | |
4436 | } | |
e58fae8f DY |
4437 | |
4438 | /* netdev of ifname is up. */ | |
4439 | if (ret) { | |
4440 | ret = lxc_netdev_down(ifname); | |
c7d76c09 CB |
4441 | if (ret) { |
4442 | ERROR("Failed to set network device \"%s\" down", ifname); | |
4443 | exit(EXIT_FAILURE); | |
4444 | } | |
e58fae8f DY |
4445 | } |
4446 | ||
4447 | ret = lxc_netdev_move_by_name(ifname, pid_outside, dst_ifname); | |
c7d76c09 CB |
4448 | /* -EINVAL means there is no netdev named as ifname. */ |
4449 | if (ret < 0) { | |
4450 | if (ret == -EINVAL) | |
4451 | ERROR("Network device \"%s\" not found", ifname); | |
4452 | else | |
4453 | ERROR("Failed to remove network device \"%s\"", ifname); | |
4454 | exit(EXIT_FAILURE); | |
e58fae8f | 4455 | } |
c7d76c09 CB |
4456 | |
4457 | exit(EXIT_SUCCESS); | |
e58fae8f DY |
4458 | } |
4459 | ||
c7d76c09 CB |
4460 | ret = wait_for_pid(pid); |
4461 | if (ret != 0) | |
e58fae8f DY |
4462 | return false; |
4463 | ||
c7d76c09 | 4464 | INFO("Moved network device \"%s\" to network namespace of %d", ifname, pid_outside); |
e58fae8f DY |
4465 | return true; |
4466 | } | |
4467 | ||
858377e4 SH |
4468 | WRAP_API_2(bool, lxcapi_detach_interface, const char *, const char *) |
4469 | ||
aef3d51e TA |
4470 | static int do_lxcapi_migrate(struct lxc_container *c, unsigned int cmd, |
4471 | struct migrate_opts *opts, unsigned int size) | |
bbd4e13e | 4472 | { |
6b9be523 | 4473 | int ret = -1; |
2cb80427 | 4474 | struct migrate_opts *valid_opts = opts; |
b5b12b9e | 4475 | uint64_t features_to_check = 0; |
85c50991 | 4476 | |
aef3d51e TA |
4477 | /* If the caller has a bigger (newer) struct migrate_opts, let's make |
4478 | * sure that the stuff on the end is zero, i.e. that they didn't ask us | |
4479 | * to do anything special. | |
4480 | */ | |
4481 | if (size > sizeof(*opts)) { | |
4482 | unsigned char *addr; | |
4483 | unsigned char *end; | |
4484 | ||
4485 | addr = (void *)opts + sizeof(*opts); | |
4486 | end = (void *)opts + size; | |
4487 | for (; addr < end; addr++) { | |
4488 | if (*addr) { | |
4489 | return -E2BIG; | |
4490 | } | |
4491 | } | |
85c50991 TA |
4492 | } |
4493 | ||
2cb80427 TA |
4494 | /* If the caller has a smaller struct, let's zero out the end for them |
4495 | * so we don't accidentally use bits of it that they didn't know about | |
4496 | * to initialize. | |
4497 | */ | |
4498 | if (size < sizeof(*opts)) { | |
4499 | valid_opts = malloc(sizeof(*opts)); | |
4500 | if (!valid_opts) | |
4501 | return -ENOMEM; | |
4502 | ||
4503 | memset(valid_opts, 0, sizeof(*opts)); | |
4504 | memcpy(valid_opts, opts, size); | |
4505 | } | |
4506 | ||
aef3d51e TA |
4507 | switch (cmd) { |
4508 | case MIGRATE_PRE_DUMP: | |
7ad13c91 TA |
4509 | if (!do_lxcapi_is_running(c)) { |
4510 | ERROR("container is not running"); | |
6b9be523 | 4511 | goto on_error; |
7ad13c91 | 4512 | } |
2cb80427 | 4513 | ret = !__criu_pre_dump(c, valid_opts); |
aef3d51e TA |
4514 | break; |
4515 | case MIGRATE_DUMP: | |
7ad13c91 TA |
4516 | if (!do_lxcapi_is_running(c)) { |
4517 | ERROR("container is not running"); | |
6b9be523 | 4518 | goto on_error; |
7ad13c91 | 4519 | } |
2cb80427 | 4520 | ret = !__criu_dump(c, valid_opts); |
aef3d51e TA |
4521 | break; |
4522 | case MIGRATE_RESTORE: | |
7ad13c91 TA |
4523 | if (do_lxcapi_is_running(c)) { |
4524 | ERROR("container is already running"); | |
6b9be523 | 4525 | goto on_error; |
7ad13c91 | 4526 | } |
2cb80427 | 4527 | ret = !__criu_restore(c, valid_opts); |
aef3d51e | 4528 | break; |
b5b12b9e AR |
4529 | case MIGRATE_FEATURE_CHECK: |
4530 | features_to_check = valid_opts->features_to_check; | |
4531 | ret = !__criu_check_feature(&features_to_check); | |
4532 | if (ret) { | |
4533 | /* Something went wrong. Let's let the caller | |
4534 | * know which feature checks failed. */ | |
4535 | valid_opts->features_to_check = features_to_check; | |
4536 | } | |
4537 | break; | |
aef3d51e TA |
4538 | default: |
4539 | ERROR("invalid migrate command %u", cmd); | |
4540 | ret = -EINVAL; | |
4541 | } | |
735f2c6e | 4542 | |
6b9be523 | 4543 | on_error: |
f686506d TA |
4544 | if (size < sizeof(*opts)) |
4545 | free(valid_opts); | |
4546 | ||
aef3d51e TA |
4547 | return ret; |
4548 | } | |
735f2c6e | 4549 | |
aef3d51e | 4550 | WRAP_API_3(int, lxcapi_migrate, unsigned int, struct migrate_opts *, unsigned int) |
735f2c6e | 4551 | |
aef3d51e TA |
4552 | static bool do_lxcapi_checkpoint(struct lxc_container *c, char *directory, bool stop, bool verbose) |
4553 | { | |
ebb088e1 AR |
4554 | struct migrate_opts opts; |
4555 | ||
4556 | memset(&opts, 0, sizeof(opts)); | |
4557 | ||
4558 | opts.directory = directory; | |
4559 | opts.stop = stop; | |
4560 | opts.verbose = verbose; | |
735f2c6e | 4561 | |
aef3d51e | 4562 | return !do_lxcapi_migrate(c, MIGRATE_DUMP, &opts, sizeof(opts)); |
735f2c6e TA |
4563 | } |
4564 | ||
858377e4 SH |
4565 | WRAP_API_3(bool, lxcapi_checkpoint, char *, bool, bool) |
4566 | ||
4567 | static bool do_lxcapi_restore(struct lxc_container *c, char *directory, bool verbose) | |
c9d8f2ee | 4568 | { |
ebb088e1 AR |
4569 | struct migrate_opts opts; |
4570 | ||
4571 | memset(&opts, 0, sizeof(opts)); | |
4572 | ||
4573 | opts.directory = directory; | |
4574 | opts.verbose = verbose; | |
c9d8f2ee | 4575 | |
aef3d51e | 4576 | return !do_lxcapi_migrate(c, MIGRATE_RESTORE, &opts, sizeof(opts)); |
735f2c6e TA |
4577 | } |
4578 | ||
858377e4 SH |
4579 | WRAP_API_2(bool, lxcapi_restore, char *, bool) |
4580 | ||
a0e93eeb CS |
4581 | static int lxcapi_attach_run_waitl(struct lxc_container *c, lxc_attach_options_t *options, const char *program, const char *arg, ...) |
4582 | { | |
4583 | va_list ap; | |
4584 | const char **argv; | |
4585 | int ret; | |
4586 | ||
4587 | if (!c) | |
4588 | return -1; | |
4589 | ||
858377e4 SH |
4590 | current_config = c->lxc_conf; |
4591 | ||
a0e93eeb CS |
4592 | va_start(ap, arg); |
4593 | argv = lxc_va_arg_list_to_argv_const(ap, 1); | |
4594 | va_end(ap); | |
4595 | ||
4596 | if (!argv) { | |
4597 | ERROR("Memory allocation error."); | |
858377e4 SH |
4598 | ret = -1; |
4599 | goto out; | |
a0e93eeb CS |
4600 | } |
4601 | argv[0] = arg; | |
4602 | ||
858377e4 | 4603 | ret = do_lxcapi_attach_run_wait(c, options, program, (const char * const *)argv); |
a0e93eeb | 4604 | free((void*)argv); |
858377e4 SH |
4605 | out: |
4606 | current_config = NULL; | |
a0e93eeb CS |
4607 | return ret; |
4608 | } | |
4609 | ||
afeecbba | 4610 | struct lxc_container *lxc_container_new(const char *name, const char *configpath) |
72d0e1cb SG |
4611 | { |
4612 | struct lxc_container *c; | |
72d0e1cb | 4613 | |
18aa217b SH |
4614 | if (!name) |
4615 | return NULL; | |
4616 | ||
72d0e1cb SG |
4617 | c = malloc(sizeof(*c)); |
4618 | if (!c) { | |
e9e29a33 | 4619 | fprintf(stderr, "Failed to allocate memory for %s\n", name); |
72d0e1cb SG |
4620 | return NULL; |
4621 | } | |
4622 | memset(c, 0, sizeof(*c)); | |
4623 | ||
afeecbba SH |
4624 | if (configpath) |
4625 | c->config_path = strdup(configpath); | |
4626 | else | |
593e8478 | 4627 | c->config_path = strdup(lxc_global_config_value("lxc.lxcpath")); |
afeecbba | 4628 | |
2a59a681 | 4629 | if (!c->config_path) { |
e9e29a33 | 4630 | fprintf(stderr, "Failed to allocate memory for %s\n", name); |
2a59a681 SH |
4631 | goto err; |
4632 | } | |
4633 | ||
f5dd1d53 | 4634 | remove_trailing_slashes(c->config_path); |
72d0e1cb SG |
4635 | c->name = malloc(strlen(name)+1); |
4636 | if (!c->name) { | |
e9e29a33 | 4637 | fprintf(stderr, "Failed to allocate memory for %s\n", name); |
72d0e1cb SG |
4638 | goto err; |
4639 | } | |
4640 | strcpy(c->name, name); | |
4641 | ||
4642 | c->numthreads = 1; | |
e9e29a33 CB |
4643 | c->slock = lxc_newlock(c->config_path, name); |
4644 | if (!c->slock) { | |
4645 | fprintf(stderr, "Failed to create lock for %s\n", name); | |
72d0e1cb SG |
4646 | goto err; |
4647 | } | |
4648 | ||
e9e29a33 CB |
4649 | c->privlock = lxc_newlock(NULL, NULL); |
4650 | if (!c->privlock) { | |
4651 | fprintf(stderr, "Failed to create private lock for %s\n", name); | |
72d0e1cb SG |
4652 | goto err; |
4653 | } | |
4654 | ||
afeecbba | 4655 | if (!set_config_filename(c)) { |
e9e29a33 | 4656 | fprintf(stderr, "Failed to create config file name for %s\n", name); |
72d0e1cb SG |
4657 | goto err; |
4658 | } | |
72d0e1cb | 4659 | |
e9e29a33 CB |
4660 | if (file_exists(c->configfile) && !lxcapi_load_config(c, NULL)) { |
4661 | fprintf(stderr, "Failed to load config for %s\n", name); | |
bac806d1 | 4662 | goto err; |
e9e29a33 | 4663 | } |
72d0e1cb | 4664 | |
3e625e2d | 4665 | if (ongoing_create(c) == 2) { |
e9e29a33 | 4666 | ERROR("Failed to complete container creation for %s", c->name); |
17a367d8 | 4667 | container_destroy(c, NULL); |
4df7f012 | 4668 | lxcapi_clear_config(c); |
3e625e2d | 4669 | } |
a2739df5 | 4670 | c->daemonize = true; |
72cf75fa | 4671 | c->pidfile = NULL; |
3e625e2d | 4672 | |
1a0e70ac | 4673 | /* Assign the member functions. */ |
72d0e1cb SG |
4674 | c->is_defined = lxcapi_is_defined; |
4675 | c->state = lxcapi_state; | |
4676 | c->is_running = lxcapi_is_running; | |
4677 | c->freeze = lxcapi_freeze; | |
4678 | c->unfreeze = lxcapi_unfreeze; | |
0115f8fd | 4679 | c->console = lxcapi_console; |
b5159817 | 4680 | c->console_getfd = lxcapi_console_getfd; |
72d0e1cb SG |
4681 | c->init_pid = lxcapi_init_pid; |
4682 | c->load_config = lxcapi_load_config; | |
4683 | c->want_daemonize = lxcapi_want_daemonize; | |
130a1888 | 4684 | c->want_close_all_fds = lxcapi_want_close_all_fds; |
72d0e1cb SG |
4685 | c->start = lxcapi_start; |
4686 | c->startl = lxcapi_startl; | |
4687 | c->stop = lxcapi_stop; | |
4688 | c->config_file_name = lxcapi_config_file_name; | |
4689 | c->wait = lxcapi_wait; | |
4690 | c->set_config_item = lxcapi_set_config_item; | |
4691 | c->destroy = lxcapi_destroy; | |
18aa217b | 4692 | c->destroy_with_snapshots = lxcapi_destroy_with_snapshots; |
06e5650e | 4693 | c->rename = lxcapi_rename; |
72d0e1cb SG |
4694 | c->save_config = lxcapi_save_config; |
4695 | c->get_keys = lxcapi_get_keys; | |
4696 | c->create = lxcapi_create; | |
4697 | c->createl = lxcapi_createl; | |
4698 | c->shutdown = lxcapi_shutdown; | |
3e625e2d | 4699 | c->reboot = lxcapi_reboot; |
d39b10eb | 4700 | c->reboot2 = lxcapi_reboot2; |
4df7f012 | 4701 | c->clear_config = lxcapi_clear_config; |
72d0e1cb SG |
4702 | c->clear_config_item = lxcapi_clear_config_item; |
4703 | c->get_config_item = lxcapi_get_config_item; | |
8ac18377 | 4704 | c->get_running_config_item = lxcapi_get_running_config_item; |
794dd120 SH |
4705 | c->get_cgroup_item = lxcapi_get_cgroup_item; |
4706 | c->set_cgroup_item = lxcapi_set_cgroup_item; | |
2a59a681 SH |
4707 | c->get_config_path = lxcapi_get_config_path; |
4708 | c->set_config_path = lxcapi_set_config_path; | |
9be53773 | 4709 | c->clone = lxcapi_clone; |
799f29ab | 4710 | c->get_interfaces = lxcapi_get_interfaces; |
9c83a661 | 4711 | c->get_ips = lxcapi_get_ips; |
a0e93eeb CS |
4712 | c->attach = lxcapi_attach; |
4713 | c->attach_run_wait = lxcapi_attach_run_wait; | |
4714 | c->attach_run_waitl = lxcapi_attach_run_waitl; | |
f5dd1d53 SH |
4715 | c->snapshot = lxcapi_snapshot; |
4716 | c->snapshot_list = lxcapi_snapshot_list; | |
4717 | c->snapshot_restore = lxcapi_snapshot_restore; | |
771d96b3 | 4718 | c->snapshot_destroy = lxcapi_snapshot_destroy; |
18aa217b | 4719 | c->snapshot_destroy_all = lxcapi_snapshot_destroy_all; |
b494d2dd | 4720 | c->may_control = lxcapi_may_control; |
a9a0ed90 ÇO |
4721 | c->add_device_node = lxcapi_add_device_node; |
4722 | c->remove_device_node = lxcapi_remove_device_node; | |
e58fae8f DY |
4723 | c->attach_interface = lxcapi_attach_interface; |
4724 | c->detach_interface = lxcapi_detach_interface; | |
735f2c6e TA |
4725 | c->checkpoint = lxcapi_checkpoint; |
4726 | c->restore = lxcapi_restore; | |
aef3d51e | 4727 | c->migrate = lxcapi_migrate; |
191d43cc | 4728 | c->console_log = lxcapi_console_log; |
72d0e1cb | 4729 | |
72d0e1cb SG |
4730 | return c; |
4731 | ||
4732 | err: | |
4733 | lxc_container_free(c); | |
4734 | return NULL; | |
4735 | } | |
4736 | ||
4a7c7daa | 4737 | int lxc_get_wait_states(const char **states) |
72d0e1cb SG |
4738 | { |
4739 | int i; | |
4740 | ||
4741 | if (states) | |
4742 | for (i=0; i<MAX_STATE; i++) | |
4743 | states[i] = lxc_state2str(i); | |
4744 | return MAX_STATE; | |
4745 | } | |
a41f104b | 4746 | |
a41f104b SH |
4747 | /* |
4748 | * These next two could probably be done smarter with reusing a common function | |
4749 | * with different iterators and tests... | |
4750 | */ | |
4751 | int list_defined_containers(const char *lxcpath, char ***names, struct lxc_container ***cret) | |
4752 | { | |
4753 | DIR *dir; | |
4754 | int i, cfound = 0, nfound = 0; | |
74f96976 | 4755 | struct dirent *direntp; |
a41f104b SH |
4756 | struct lxc_container *c; |
4757 | ||
4758 | if (!lxcpath) | |
593e8478 | 4759 | lxcpath = lxc_global_config_value("lxc.lxcpath"); |
a41f104b | 4760 | |
a41f104b | 4761 | dir = opendir(lxcpath); |
a41f104b SH |
4762 | if (!dir) { |
4763 | SYSERROR("opendir on lxcpath"); | |
4764 | return -1; | |
4765 | } | |
4766 | ||
4767 | if (cret) | |
4768 | *cret = NULL; | |
4769 | if (names) | |
4770 | *names = NULL; | |
4771 | ||
74f96976 | 4772 | while ((direntp = readdir(dir))) { |
a41f104b SH |
4773 | if (!direntp) |
4774 | break; | |
e4ebeab1 | 4775 | |
1a0e70ac | 4776 | /* Ignore '.', '..' and any hidden directory. */ |
e4ebeab1 | 4777 | if (!strncmp(direntp->d_name, ".", 1)) |
a41f104b SH |
4778 | continue; |
4779 | ||
4780 | if (!config_file_exists(lxcpath, direntp->d_name)) | |
4781 | continue; | |
4782 | ||
4783 | if (names) { | |
9c88ff1f | 4784 | if (!add_to_array(names, direntp->d_name, cfound)) |
a41f104b SH |
4785 | goto free_bad; |
4786 | } | |
4787 | cfound++; | |
4788 | ||
4789 | if (!cret) { | |
4790 | nfound++; | |
4791 | continue; | |
4792 | } | |
4793 | ||
4794 | c = lxc_container_new(direntp->d_name, lxcpath); | |
4795 | if (!c) { | |
4796 | INFO("Container %s:%s has a config but could not be loaded", | |
4797 | lxcpath, direntp->d_name); | |
4798 | if (names) | |
9c88ff1f ÇO |
4799 | if(!remove_from_array(names, direntp->d_name, cfound--)) |
4800 | goto free_bad; | |
a41f104b SH |
4801 | continue; |
4802 | } | |
858377e4 | 4803 | if (!do_lxcapi_is_defined(c)) { |
a41f104b SH |
4804 | INFO("Container %s:%s has a config but is not defined", |
4805 | lxcpath, direntp->d_name); | |
4806 | if (names) | |
9c88ff1f ÇO |
4807 | if(!remove_from_array(names, direntp->d_name, cfound--)) |
4808 | goto free_bad; | |
a41f104b SH |
4809 | lxc_container_put(c); |
4810 | continue; | |
4811 | } | |
4812 | ||
2871830a | 4813 | if (!add_to_clist(cret, c, nfound, true)) { |
a41f104b SH |
4814 | lxc_container_put(c); |
4815 | goto free_bad; | |
4816 | } | |
4817 | nfound++; | |
4818 | } | |
4819 | ||
a41f104b | 4820 | closedir(dir); |
a41f104b SH |
4821 | return nfound; |
4822 | ||
4823 | free_bad: | |
4824 | if (names && *names) { | |
4825 | for (i=0; i<cfound; i++) | |
4826 | free((*names)[i]); | |
4827 | free(*names); | |
4828 | } | |
4829 | if (cret && *cret) { | |
4830 | for (i=0; i<nfound; i++) | |
4831 | lxc_container_put((*cret)[i]); | |
4832 | free(*cret); | |
4833 | } | |
a41f104b | 4834 | closedir(dir); |
a41f104b SH |
4835 | return -1; |
4836 | } | |
4837 | ||
148a9d27 DE |
4838 | int list_active_containers(const char *lxcpath, char ***nret, |
4839 | struct lxc_container ***cret) | |
a41f104b | 4840 | { |
148a9d27 | 4841 | int i, ret = -1, cret_cnt = 0, ct_name_cnt = 0; |
a41f104b SH |
4842 | int lxcpath_len; |
4843 | char *line = NULL; | |
148a9d27 | 4844 | char **ct_name = NULL; |
a41f104b | 4845 | size_t len = 0; |
97bc2422 | 4846 | struct lxc_container *c = NULL; |
88556fd7 | 4847 | bool is_hashed; |
a41f104b SH |
4848 | |
4849 | if (!lxcpath) | |
593e8478 | 4850 | lxcpath = lxc_global_config_value("lxc.lxcpath"); |
a41f104b SH |
4851 | lxcpath_len = strlen(lxcpath); |
4852 | ||
4853 | if (cret) | |
4854 | *cret = NULL; | |
148a9d27 DE |
4855 | if (nret) |
4856 | *nret = NULL; | |
a41f104b | 4857 | |
a41f104b | 4858 | FILE *f = fopen("/proc/net/unix", "r"); |
a41f104b SH |
4859 | if (!f) |
4860 | return -1; | |
4861 | ||
4862 | while (getline(&line, &len, f) != -1) { | |
88556fd7 | 4863 | |
0f8f9c8a | 4864 | char *p = strrchr(line, ' '), *p2; |
a41f104b SH |
4865 | if (!p) |
4866 | continue; | |
4867 | p++; | |
4868 | if (*p != 0x40) | |
4869 | continue; | |
4870 | p++; | |
88556fd7 ÇO |
4871 | |
4872 | is_hashed = false; | |
4873 | if (strncmp(p, lxcpath, lxcpath_len) == 0) { | |
4874 | p += lxcpath_len; | |
4875 | } else if (strncmp(p, "lxc/", 4) == 0) { | |
4876 | p += 4; | |
4877 | is_hashed = true; | |
4878 | } else { | |
a41f104b | 4879 | continue; |
88556fd7 ÇO |
4880 | } |
4881 | ||
a41f104b SH |
4882 | while (*p == '/') |
4883 | p++; | |
4884 | ||
1a0e70ac | 4885 | /* Now p is the start of lxc_name. */ |
46cd2845 | 4886 | p2 = strchr(p, '/'); |
a41f104b SH |
4887 | if (!p2 || strncmp(p2, "/command", 8) != 0) |
4888 | continue; | |
4889 | *p2 = '\0'; | |
4890 | ||
88556fd7 | 4891 | if (is_hashed) { |
899a9f55 CB |
4892 | char *recvpath = lxc_cmd_get_lxcpath(p); |
4893 | if (!recvpath) | |
4894 | continue; | |
4895 | if (strncmp(lxcpath, recvpath, lxcpath_len) != 0) | |
88556fd7 ÇO |
4896 | continue; |
4897 | p = lxc_cmd_get_name(p); | |
ee2d7093 L |
4898 | if (!p) |
4899 | continue; | |
88556fd7 ÇO |
4900 | } |
4901 | ||
148a9d27 | 4902 | if (array_contains(&ct_name, p, ct_name_cnt)) |
9c88ff1f ÇO |
4903 | continue; |
4904 | ||
148a9d27 DE |
4905 | if (!add_to_array(&ct_name, p, ct_name_cnt)) |
4906 | goto free_cret_list; | |
9c88ff1f | 4907 | |
148a9d27 | 4908 | ct_name_cnt++; |
a41f104b | 4909 | |
148a9d27 | 4910 | if (!cret) |
a41f104b | 4911 | continue; |
a41f104b SH |
4912 | |
4913 | c = lxc_container_new(p, lxcpath); | |
4914 | if (!c) { | |
4915 | INFO("Container %s:%s is running but could not be loaded", | |
4916 | lxcpath, p); | |
148a9d27 | 4917 | remove_from_array(&ct_name, p, ct_name_cnt--); |
a41f104b SH |
4918 | continue; |
4919 | } | |
4920 | ||
4921 | /* | |
4922 | * If this is an anonymous container, then is_defined *can* | |
4923 | * return false. So we don't do that check. Count on the | |
4924 | * fact that the command socket exists. | |
4925 | */ | |
4926 | ||
148a9d27 | 4927 | if (!add_to_clist(cret, c, cret_cnt, true)) { |
a41f104b | 4928 | lxc_container_put(c); |
148a9d27 | 4929 | goto free_cret_list; |
a41f104b | 4930 | } |
148a9d27 | 4931 | cret_cnt++; |
a41f104b SH |
4932 | } |
4933 | ||
97bc2422 CB |
4934 | if (nret && cret && cret_cnt != ct_name_cnt) { |
4935 | if (c) | |
4936 | lxc_container_put(c); | |
4937 | goto free_cret_list; | |
4938 | } | |
4939 | ||
148a9d27 DE |
4940 | ret = ct_name_cnt; |
4941 | if (nret) | |
4942 | *nret = ct_name; | |
4943 | else | |
4944 | goto free_ct_name; | |
4945 | goto out; | |
a41f104b | 4946 | |
148a9d27 | 4947 | free_cret_list: |
a41f104b | 4948 | if (cret && *cret) { |
148a9d27 | 4949 | for (i = 0; i < cret_cnt; i++) |
a41f104b SH |
4950 | lxc_container_put((*cret)[i]); |
4951 | free(*cret); | |
4952 | } | |
148a9d27 DE |
4953 | |
4954 | free_ct_name: | |
4955 | if (ct_name) { | |
4956 | for (i = 0; i < ct_name_cnt; i++) | |
4957 | free(ct_name[i]); | |
4958 | free(ct_name); | |
4959 | } | |
4960 | ||
4961 | out: | |
f10fad2f | 4962 | free(line); |
e853a32d | 4963 | |
a41f104b | 4964 | fclose(f); |
148a9d27 | 4965 | return ret; |
a41f104b | 4966 | } |
2871830a DE |
4967 | |
4968 | int list_all_containers(const char *lxcpath, char ***nret, | |
4969 | struct lxc_container ***cret) | |
4970 | { | |
4971 | int i, ret, active_cnt, ct_cnt, ct_list_cnt; | |
4972 | char **active_name; | |
4973 | char **ct_name; | |
4974 | struct lxc_container **ct_list = NULL; | |
4975 | ||
4976 | ct_cnt = list_defined_containers(lxcpath, &ct_name, NULL); | |
4977 | if (ct_cnt < 0) | |
4978 | return ct_cnt; | |
4979 | ||
4980 | active_cnt = list_active_containers(lxcpath, &active_name, NULL); | |
4981 | if (active_cnt < 0) { | |
4982 | ret = active_cnt; | |
4983 | goto free_ct_name; | |
4984 | } | |
4985 | ||
4986 | for (i = 0; i < active_cnt; i++) { | |
4987 | if (!array_contains(&ct_name, active_name[i], ct_cnt)) { | |
4988 | if (!add_to_array(&ct_name, active_name[i], ct_cnt)) { | |
4989 | ret = -1; | |
4990 | goto free_active_name; | |
4991 | } | |
4992 | ct_cnt++; | |
4993 | } | |
4994 | free(active_name[i]); | |
4995 | active_name[i] = NULL; | |
4996 | } | |
4997 | free(active_name); | |
4998 | active_name = NULL; | |
4999 | active_cnt = 0; | |
5000 | ||
5001 | for (i = 0, ct_list_cnt = 0; i < ct_cnt && cret; i++) { | |
5002 | struct lxc_container *c; | |
5003 | ||
5004 | c = lxc_container_new(ct_name[i], lxcpath); | |
5005 | if (!c) { | |
5006 | WARN("Container %s:%s could not be loaded", lxcpath, ct_name[i]); | |
5007 | remove_from_array(&ct_name, ct_name[i], ct_cnt--); | |
5008 | continue; | |
5009 | } | |
5010 | ||
5011 | if (!add_to_clist(&ct_list, c, ct_list_cnt, false)) { | |
5012 | lxc_container_put(c); | |
5013 | ret = -1; | |
5014 | goto free_ct_list; | |
5015 | } | |
5016 | ct_list_cnt++; | |
5017 | } | |
5018 | ||
5019 | if (cret) | |
5020 | *cret = ct_list; | |
5021 | ||
5022 | if (nret) | |
5023 | *nret = ct_name; | |
5024 | else { | |
5025 | ret = ct_cnt; | |
5026 | goto free_ct_name; | |
5027 | } | |
5028 | return ct_cnt; | |
5029 | ||
5030 | free_ct_list: | |
5031 | for (i = 0; i < ct_list_cnt; i++) { | |
5032 | lxc_container_put(ct_list[i]); | |
5033 | } | |
f10fad2f | 5034 | free(ct_list); |
2871830a DE |
5035 | |
5036 | free_active_name: | |
5037 | for (i = 0; i < active_cnt; i++) { | |
f10fad2f | 5038 | free(active_name[i]); |
2871830a | 5039 | } |
f10fad2f | 5040 | free(active_name); |
2871830a DE |
5041 | |
5042 | free_ct_name: | |
5043 | for (i = 0; i < ct_cnt; i++) { | |
5044 | free(ct_name[i]); | |
5045 | } | |
5046 | free(ct_name); | |
5047 | return ret; | |
5048 | } | |
12461428 CB |
5049 | |
5050 | bool lxc_config_item_is_supported(const char *key) | |
5051 | { | |
300df83e | 5052 | return !!lxc_get_config(key); |
12461428 | 5053 | } |