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1 | /* | |
2 | * | |
3 | * Copyright © 2015 Christian Brauner <christian.brauner@mailbox.org>. | |
4 | * | |
5 | * This program is free software; you can redistribute it and/or modify | |
6 | * it under the terms of the GNU General Public License version 2, as | |
7 | * published by the Free Software Foundation. | |
8 | * | |
9 | * This program is distributed in the hope that it will be useful, | |
10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
12 | * GNU General Public License for more details. | |
13 | * | |
14 | * You should have received a copy of the GNU General Public License along | |
15 | * with this program; if not, write to the Free Software Foundation, Inc., | |
16 | * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. | |
17 | */ | |
18 | ||
19 | #define _GNU_SOURCE | |
20 | #include "config.h" | |
21 | ||
22 | #include <unistd.h> | |
23 | #include <getopt.h> | |
24 | #include <signal.h> | |
25 | #include <stdio.h> | |
26 | #include <sys/types.h> | |
27 | #include <stdint.h> | |
28 | #include <sys/wait.h> | |
29 | #include <stdlib.h> | |
30 | #include <errno.h> | |
31 | #include <ctype.h> | |
32 | #include <sys/stat.h> | |
33 | #include <fcntl.h> | |
34 | #include <time.h> | |
35 | #include <stdbool.h> | |
36 | ||
37 | #include <lxc/lxccontainer.h> | |
38 | ||
39 | #include "attach.h" | |
40 | #include "log.h" | |
41 | #include "confile.h" | |
42 | #include "arguments.h" | |
43 | #include "lxc.h" | |
44 | #include "conf.h" | |
45 | #include "state.h" | |
46 | #include "utils.h" | |
47 | #include "bdev/bdev.h" | |
48 | ||
49 | #ifndef HAVE_GETSUBOPT | |
50 | #include <../include/getsubopt.h> | |
51 | #endif | |
52 | ||
53 | lxc_log_define(lxc_copy_ui, lxc); | |
54 | ||
55 | enum mnttype { | |
56 | LXC_MNT_BIND, | |
57 | LXC_MNT_AUFS, | |
58 | LXC_MNT_OVL, | |
59 | }; | |
60 | ||
61 | struct mnts { | |
62 | enum mnttype mnt_type; | |
63 | char *src; | |
64 | char *dest; | |
65 | char *options; | |
66 | char *upper; | |
67 | char *workdir; | |
68 | char *lower; | |
69 | }; | |
70 | ||
71 | static unsigned int mnt_table_size = 0; | |
72 | static struct mnts *mnt_table = NULL; | |
73 | ||
74 | static int my_parser(struct lxc_arguments *args, int c, char *arg); | |
75 | ||
76 | static const struct option my_longopts[] = { | |
77 | { "newname", required_argument, 0, 'N'}, | |
78 | { "newpath", required_argument, 0, 'p'}, | |
79 | { "rename", no_argument, 0, 'R'}, | |
80 | { "snapshot", no_argument, 0, 's'}, | |
81 | { "foreground", no_argument, 0, 'F'}, | |
82 | { "daemon", no_argument, 0, 'd'}, | |
83 | { "ephemeral", no_argument, 0, 'e'}, | |
84 | { "mount", required_argument, 0, 'm'}, | |
85 | { "backingstore", required_argument, 0, 'B'}, | |
86 | { "fssize", required_argument, 0, 'L'}, | |
87 | { "keepdata", no_argument, 0, 'D'}, | |
88 | { "keepname", no_argument, 0, 'K'}, | |
89 | { "keepmac", no_argument, 0, 'M'}, | |
90 | LXC_COMMON_OPTIONS | |
91 | }; | |
92 | ||
93 | /* mount keys */ | |
94 | static char *const keys[] = { | |
95 | [LXC_MNT_BIND] = "bind", | |
96 | [LXC_MNT_AUFS] = "aufs", | |
97 | [LXC_MNT_OVL] = "overlay", | |
98 | NULL | |
99 | }; | |
100 | ||
101 | static struct lxc_arguments my_args = { | |
102 | .progname = "lxc-copy", | |
103 | .help = "\n\ | |
104 | --name=NAME [-P lxcpath] -N newname [-p newpath] [-B backingstorage] [-s] [-K] [-M] [-L size [unit]]\n\ | |
105 | --name=NAME [-P lxcpath] [-N newname] [-p newpath] [-B backingstorage] -e [-d] [-D] [-K] [-M] [-m {bind,aufs,overlay}=/src:/dest]\n\ | |
106 | --name=NAME [-P lxcpath] -N newname -R\n\ | |
107 | \n\ | |
108 | lxc-copy clone a container\n\ | |
109 | \n\ | |
110 | Options :\n\ | |
111 | -n, --name=NAME NAME of the container\n\ | |
112 | -N, --newname=NEWNAME NEWNAME for the restored container\n\ | |
113 | -p, --newpath=NEWPATH NEWPATH for the container to be stored\n\ | |
114 | -R, --rename rename container\n\ | |
115 | -s, --snapshot create snapshot instead of clone\n\ | |
116 | -F, --foreground start with current tty attached to /dev/console\n\ | |
117 | -d, --daemon daemonize the container (default)\n\ | |
118 | -e, --ephemeral start ephemeral container\n\ | |
119 | -m, --mount directory to mount into container, either \n\ | |
120 | {bind,aufs,overlay}=/src-path or {bind,aufs,overlay}=/src-path:/dst-path\n\ | |
121 | -B, --backingstorage=TYPE backingstorage type for the container\n\ | |
122 | -L, --fssize size of the new block device for block device containers\n\ | |
123 | -D, --keedata pass together with -e start a persistent snapshot \n\ | |
124 | -K, --keepname keep the hostname of the original container\n\ | |
125 | -M, --keepmac keep the MAC address of the original container\n", | |
126 | .options = my_longopts, | |
127 | .parser = my_parser, | |
128 | .task = CLONE, | |
129 | .daemonize = 1, | |
130 | .quiet = false, | |
131 | }; | |
132 | ||
133 | static struct mnts *add_mnt(struct mnts **mnts, unsigned int *num, | |
134 | enum mnttype type); | |
135 | static int mk_rand_ovl_dirs(struct mnts *mnts, unsigned int num, | |
136 | struct lxc_arguments *arg); | |
137 | static char *construct_path(char *path, bool as_prefix); | |
138 | static char *set_mnt_entry(struct mnts *m); | |
139 | static int do_clone(struct lxc_container *c, char *newname, char *newpath, | |
140 | int flags, char *bdevtype, uint64_t fssize, enum task task, | |
141 | char **args); | |
142 | static int do_clone_ephemeral(struct lxc_container *c, | |
143 | struct lxc_arguments *arg, char **args, | |
144 | int flags); | |
145 | static int do_clone_rename(struct lxc_container *c, char *newname); | |
146 | static int do_clone_task(struct lxc_container *c, enum task task, int flags, | |
147 | char **args); | |
148 | static void free_mnts(void); | |
149 | static uint64_t get_fssize(char *s); | |
150 | static int parse_mntsubopts(char *subopts, char *const *keys, | |
151 | char *mntparameters); | |
152 | static int parse_aufs_mnt(char *mntstring, enum mnttype type); | |
153 | static int parse_bind_mnt(char *mntstring, enum mnttype type); | |
154 | static int parse_ovl_mnt(char *mntstring, enum mnttype type); | |
155 | ||
156 | int main(int argc, char *argv[]) | |
157 | { | |
158 | struct lxc_container *c; | |
159 | int flags = 0; | |
160 | int ret = EXIT_FAILURE; | |
161 | ||
162 | if (lxc_arguments_parse(&my_args, argc, argv)) | |
163 | exit(ret); | |
164 | ||
165 | if (!my_args.log_file) | |
166 | my_args.log_file = "none"; | |
167 | ||
168 | if (lxc_log_init(my_args.name, my_args.log_file, my_args.log_priority, | |
169 | my_args.progname, my_args.quiet, my_args.lxcpath[0])) | |
170 | exit(ret); | |
171 | lxc_log_options_no_override(); | |
172 | ||
173 | if (geteuid()) { | |
174 | if (access(my_args.lxcpath[0], O_RDWR) < 0) { | |
175 | if (!my_args.quiet) | |
176 | fprintf(stderr, "You lack access to %s\n", my_args.lxcpath[0]); | |
177 | exit(ret); | |
178 | } | |
179 | } | |
180 | ||
181 | if (!my_args.newname && !(my_args.task == DESTROY)) { | |
182 | if (!my_args.quiet) | |
183 | printf("Error: You must provide a NEWNAME for the clone.\n"); | |
184 | exit(ret); | |
185 | } | |
186 | ||
187 | if (my_args.task == SNAP || my_args.task == DESTROY) | |
188 | flags |= LXC_CLONE_SNAPSHOT; | |
189 | if (my_args.keepname) | |
190 | flags |= LXC_CLONE_KEEPNAME; | |
191 | if (my_args.keepmac) | |
192 | flags |= LXC_CLONE_KEEPMACADDR; | |
193 | ||
194 | if (!my_args.newpath) | |
195 | my_args.newpath = (char *)my_args.lxcpath[0]; | |
196 | ||
197 | c = lxc_container_new(my_args.name, my_args.lxcpath[0]); | |
198 | if (!c) | |
199 | exit(ret); | |
200 | ||
201 | if (!c->may_control(c)) { | |
202 | if (!my_args.quiet) | |
203 | fprintf(stderr, "Insufficent privileges to control %s\n", c->name); | |
204 | goto out; | |
205 | } | |
206 | ||
207 | if (!c->is_defined(c)) { | |
208 | if (!my_args.quiet) | |
209 | fprintf(stderr, "Error: container %s is not defined\n", c->name); | |
210 | goto out; | |
211 | } | |
212 | ||
213 | ret = do_clone_task(c, my_args.task, flags, &argv[optind]); | |
214 | ||
215 | out: | |
216 | lxc_container_put(c); | |
217 | ||
218 | if (ret == 0) | |
219 | exit(EXIT_SUCCESS); | |
220 | exit(EXIT_FAILURE); | |
221 | } | |
222 | ||
223 | static struct mnts *add_mnt(struct mnts **mnts, unsigned int *num, enum mnttype type) | |
224 | { | |
225 | struct mnts *m, *n; | |
226 | ||
227 | n = realloc(*mnts, (*num + 1) * sizeof(struct mnts)); | |
228 | if (!n) | |
229 | return NULL; | |
230 | ||
231 | *mnts = n; | |
232 | m = *mnts + *num; | |
233 | (*num)++; | |
234 | ||
235 | *m = (struct mnts) {.mnt_type = type}; | |
236 | ||
237 | return m; | |
238 | } | |
239 | ||
240 | static int mk_rand_ovl_dirs(struct mnts *mnts, unsigned int num, struct lxc_arguments *arg) | |
241 | { | |
242 | char upperdir[MAXPATHLEN]; | |
243 | char workdir[MAXPATHLEN]; | |
244 | unsigned int i; | |
245 | int ret; | |
246 | struct mnts *m = NULL; | |
247 | ||
248 | for (i = 0, m = mnts; i < num; i++, m++) { | |
249 | if ((m->mnt_type == LXC_MNT_OVL) || (m->mnt_type == LXC_MNT_AUFS)) { | |
250 | ret = snprintf(upperdir, MAXPATHLEN, "%s/%s/delta#XXXXXX", | |
251 | arg->newpath, arg->newname); | |
252 | if (ret < 0 || ret >= MAXPATHLEN) | |
253 | return -1; | |
254 | if (!mkdtemp(upperdir)) | |
255 | return -1; | |
256 | m->upper = strdup(upperdir); | |
257 | if (!m->upper) | |
258 | return -1; | |
259 | } | |
260 | ||
261 | if (m->mnt_type == LXC_MNT_OVL) { | |
262 | ret = snprintf(workdir, MAXPATHLEN, "%s/%s/work#XXXXXX", | |
263 | arg->newpath, arg->newname); | |
264 | if (ret < 0 || ret >= MAXPATHLEN) | |
265 | return -1; | |
266 | if (!mkdtemp(workdir)) | |
267 | return -1; | |
268 | m->workdir = strdup(workdir); | |
269 | if (!m->workdir) | |
270 | return -1; | |
271 | } | |
272 | } | |
273 | ||
274 | return 0; | |
275 | } | |
276 | ||
277 | static char *construct_path(char *path, bool as_prefix) | |
278 | { | |
279 | char **components = NULL; | |
280 | char *cleanpath = NULL; | |
281 | ||
282 | components = lxc_normalize_path(path); | |
283 | if (!components) | |
284 | return NULL; | |
285 | ||
286 | cleanpath = lxc_string_join("/", (const char **)components, as_prefix); | |
287 | lxc_free_array((void **)components, free); | |
288 | ||
289 | return cleanpath; | |
290 | } | |
291 | ||
292 | static char *set_mnt_entry(struct mnts *m) | |
293 | { | |
294 | char *mntentry = NULL; | |
295 | int ret = 0; | |
296 | size_t len = 0; | |
297 | ||
298 | if (m->mnt_type == LXC_MNT_AUFS) { | |
299 | len = strlen(" aufs br==rw:=ro,xino=,create=dir") + | |
300 | 2 * strlen(m->src) + strlen(m->dest) + strlen(m->upper) + | |
301 | strlen(m->workdir) + 1; | |
302 | ||
303 | mntentry = malloc(len); | |
304 | if (!mntentry) | |
305 | goto err; | |
306 | ||
307 | ret = snprintf(mntentry, len, "%s %s aufs br=%s=rw:%s=ro,xino=%s,create=dir", | |
308 | m->src, m->dest, m->upper, m->src, m->workdir); | |
309 | if (ret < 0 || (size_t)ret >= len) | |
310 | goto err; | |
311 | } else if (m->mnt_type == LXC_MNT_OVL) { | |
312 | len = strlen(" overlay lowerdir=,upperdir=,workdir=,create=dir") + | |
313 | 2 * strlen(m->src) + strlen(m->dest) + strlen(m->upper) + | |
314 | strlen(m->workdir) + 1; | |
315 | ||
316 | mntentry = malloc(len); | |
317 | if (!mntentry) | |
318 | goto err; | |
319 | ||
320 | ret = snprintf(mntentry, len, "%s %s overlay lowerdir=%s,upperdir=%s,workdir=%s,create=dir", | |
321 | m->src, m->dest, m->src, m->upper, m->workdir); | |
322 | if (ret < 0 || (size_t)ret >= len) | |
323 | goto err; | |
324 | } else if (m->mnt_type == LXC_MNT_BIND) { | |
325 | len = strlen(" none bind,optional,, 0 0") + | |
326 | strlen(is_dir(m->src) ? "create=dir" : "create=file") + | |
327 | strlen(m->src) + strlen(m->dest) + strlen(m->options) + 1; | |
328 | ||
329 | mntentry = malloc(len); | |
330 | if (!mntentry) | |
331 | goto err; | |
332 | ||
333 | ret = snprintf(mntentry, len, "%s %s none bind,optional,%s,%s 0 0", | |
334 | m->src, m->dest, m->options, | |
335 | is_dir(m->src) ? "create=dir" : "create=file"); | |
336 | if (ret < 0 || (size_t)ret >= len) | |
337 | goto err; | |
338 | } | |
339 | ||
340 | return mntentry; | |
341 | ||
342 | err: | |
343 | free(mntentry); | |
344 | return NULL; | |
345 | } | |
346 | ||
347 | static int do_clone(struct lxc_container *c, char *newname, char *newpath, | |
348 | int flags, char *bdevtype, uint64_t fssize, enum task task, | |
349 | char **args) | |
350 | { | |
351 | struct lxc_container *clone; | |
352 | ||
353 | clone = c->clone(c, newname, newpath, flags, bdevtype, NULL, fssize, | |
354 | args); | |
355 | if (!clone) { | |
356 | if (!my_args.quiet) | |
357 | fprintf(stderr, "clone failed\n"); | |
358 | return -1; | |
359 | } | |
360 | ||
361 | INFO("Created container %s as %s of %s\n", newname, | |
362 | task ? "snapshot" : "copy", c->name); | |
363 | ||
364 | lxc_container_put(clone); | |
365 | ||
366 | return 0; | |
367 | } | |
368 | ||
369 | static int do_clone_ephemeral(struct lxc_container *c, | |
370 | struct lxc_arguments *arg, char **args, int flags) | |
371 | { | |
372 | char randname[MAXPATHLEN]; | |
373 | unsigned int i; | |
374 | int ret = 0; | |
375 | bool bret = true, started = false; | |
376 | struct lxc_container *clone; | |
377 | ||
378 | lxc_attach_options_t attach_options = LXC_ATTACH_OPTIONS_DEFAULT; | |
379 | attach_options.env_policy = LXC_ATTACH_CLEAR_ENV; | |
380 | ||
381 | if (!arg->newname) { | |
382 | ret = snprintf(randname, MAXPATHLEN, "%s/%s_XXXXXX", arg->newpath, arg->name); | |
383 | if (ret < 0 || ret >= MAXPATHLEN) | |
384 | return -1; | |
385 | if (!mkdtemp(randname)) | |
386 | return -1; | |
387 | if (chmod(randname, 0770) < 0) { | |
388 | remove(randname); | |
389 | return -1; | |
390 | } | |
391 | arg->newname = randname + strlen(arg->newpath) + 1; | |
392 | } | |
393 | ||
394 | clone = c->clone(c, arg->newname, arg->newpath, flags, | |
395 | arg->bdevtype, NULL, arg->fssize, args); | |
396 | if (!clone) | |
397 | return -1; | |
398 | ||
399 | if (!arg->keepdata) | |
400 | if (!clone->set_config_item(clone, "lxc.ephemeral", "1")) | |
401 | goto destroy_and_put; | |
402 | ||
403 | /* allocate and create random upper- and workdirs for overlay mounts */ | |
404 | if (mk_rand_ovl_dirs(mnt_table, mnt_table_size, arg) < 0) | |
405 | goto destroy_and_put; | |
406 | ||
407 | /* allocate and set mount entries */ | |
408 | struct mnts *n = NULL; | |
409 | for (i = 0, n = mnt_table; i < mnt_table_size; i++, n++) { | |
410 | char *mntentry = NULL; | |
411 | mntentry = set_mnt_entry(n); | |
412 | if (!mntentry) | |
413 | goto destroy_and_put; | |
414 | bret = clone->set_config_item(clone, "lxc.mount.entry", mntentry); | |
415 | free(mntentry); | |
416 | if (!bret) | |
417 | goto destroy_and_put; | |
418 | } | |
419 | ||
420 | if (!clone->save_config(clone, NULL)) | |
421 | goto destroy_and_put; | |
422 | ||
423 | if (!my_args.quiet) | |
424 | printf("Created %s as %s of %s\n", arg->name, "clone", arg->newname); | |
425 | ||
426 | if (!arg->daemonize && arg->argc) { | |
427 | clone->want_daemonize(clone, true); | |
428 | arg->daemonize = 1; | |
429 | } else if (!arg->daemonize) { | |
430 | clone->want_daemonize(clone, false); | |
431 | } | |
432 | ||
433 | started = clone->start(clone, 0, NULL); | |
434 | if (!started) | |
435 | goto destroy_and_put; | |
436 | ||
437 | if (arg->daemonize && arg->argc) { | |
438 | ret = clone->attach_run_wait(clone, &attach_options, arg->argv[0], (const char *const *)arg->argv); | |
439 | if (ret < 0) | |
440 | goto destroy_and_put; | |
441 | clone->shutdown(clone, -1); | |
442 | } | |
443 | ||
444 | free_mnts(); | |
445 | lxc_container_put(clone); | |
446 | return 0; | |
447 | ||
448 | destroy_and_put: | |
449 | if (started) | |
450 | clone->shutdown(clone, -1); | |
451 | if (!started || clone->lxc_conf->ephemeral != 1) | |
452 | clone->destroy(clone); | |
453 | free_mnts(); | |
454 | lxc_container_put(clone); | |
455 | return -1; | |
456 | } | |
457 | ||
458 | static int do_clone_rename(struct lxc_container *c, char *newname) | |
459 | { | |
460 | if (!c->rename(c, newname)) { | |
461 | ERROR("Error: Renaming container %s to %s failed\n", c->name, newname); | |
462 | return -1; | |
463 | } | |
464 | ||
465 | INFO("Renamed container %s to %s\n", c->name, newname); | |
466 | ||
467 | return 0; | |
468 | } | |
469 | ||
470 | static int do_clone_task(struct lxc_container *c, enum task task, int flags, | |
471 | char **args) | |
472 | { | |
473 | int ret = 0; | |
474 | ||
475 | switch (task) { | |
476 | case DESTROY: | |
477 | ret = do_clone_ephemeral(c, &my_args, args, flags); | |
478 | break; | |
479 | case RENAME: | |
480 | ret = do_clone_rename(c, my_args.newname); | |
481 | break; | |
482 | default: | |
483 | ret = do_clone(c, my_args.newname, my_args.newpath, flags, | |
484 | my_args.bdevtype, my_args.fssize, my_args.task, | |
485 | args); | |
486 | break; | |
487 | } | |
488 | ||
489 | return ret; | |
490 | } | |
491 | ||
492 | static void free_mnts() | |
493 | { | |
494 | unsigned int i; | |
495 | struct mnts *n = NULL; | |
496 | ||
497 | for (i = 0, n = mnt_table; i < mnt_table_size; i++, n++) { | |
498 | free(n->src); | |
499 | free(n->dest); | |
500 | free(n->options); | |
501 | free(n->upper); | |
502 | free(n->workdir); | |
503 | } | |
504 | free(mnt_table); | |
505 | mnt_table = NULL; | |
506 | mnt_table_size = 0; | |
507 | } | |
508 | ||
509 | /* we pass fssize in bytes */ | |
510 | static uint64_t get_fssize(char *s) | |
511 | { | |
512 | uint64_t ret; | |
513 | char *end; | |
514 | ||
515 | ret = strtoull(s, &end, 0); | |
516 | if (end == s) { | |
517 | if (!my_args.quiet) | |
518 | fprintf(stderr, "Invalid blockdev size '%s', using default size\n", s); | |
519 | return 0; | |
520 | } | |
521 | while (isblank(*end)) | |
522 | end++; | |
523 | if (*end == '\0') { | |
524 | ret *= 1024ULL * 1024ULL; // MB by default | |
525 | } else if (*end == 'b' || *end == 'B') { | |
526 | ret *= 1ULL; | |
527 | } else if (*end == 'k' || *end == 'K') { | |
528 | ret *= 1024ULL; | |
529 | } else if (*end == 'm' || *end == 'M') { | |
530 | ret *= 1024ULL * 1024ULL; | |
531 | } else if (*end == 'g' || *end == 'G') { | |
532 | ret *= 1024ULL * 1024ULL * 1024ULL; | |
533 | } else if (*end == 't' || *end == 'T') { | |
534 | ret *= 1024ULL * 1024ULL * 1024ULL * 1024ULL; | |
535 | } else { | |
536 | if (!my_args.quiet) | |
537 | fprintf(stderr, "Invalid blockdev unit size '%c' in '%s', " "using default size\n", *end, s); | |
538 | return 0; | |
539 | } | |
540 | ||
541 | return ret; | |
542 | } | |
543 | ||
544 | static int my_parser(struct lxc_arguments *args, int c, char *arg) | |
545 | { | |
546 | char *subopts = NULL; | |
547 | char *mntparameters = NULL; | |
548 | switch (c) { | |
549 | case 'N': | |
550 | args->newname = arg; | |
551 | break; | |
552 | case 'p': | |
553 | args->newpath = arg; | |
554 | break; | |
555 | case 'R': | |
556 | args->task = RENAME; | |
557 | break; | |
558 | case 's': | |
559 | args->task = SNAP; | |
560 | break; | |
561 | case 'F': | |
562 | args->daemonize = 0; | |
563 | break; | |
564 | case 'd': | |
565 | args->daemonize = 1; | |
566 | break; | |
567 | case 'e': | |
568 | args->task = DESTROY; | |
569 | break; | |
570 | case 'm': | |
571 | subopts = optarg; | |
572 | if (parse_mntsubopts(subopts, keys, mntparameters) < 0) | |
573 | return -1; | |
574 | break; | |
575 | case 'B': | |
576 | args->bdevtype = arg; | |
577 | break; | |
578 | case 'L': | |
579 | args->fssize = get_fssize(optarg); | |
580 | break; | |
581 | case 'D': | |
582 | args->keepdata = 1; | |
583 | break; | |
584 | case 'K': | |
585 | args->keepname = 1; | |
586 | break; | |
587 | case 'M': | |
588 | args->keepmac = 1; | |
589 | break; | |
590 | } | |
591 | ||
592 | return 0; | |
593 | } | |
594 | ||
595 | static int parse_aufs_mnt(char *mntstring, enum mnttype type) | |
596 | { | |
597 | int len = 0; | |
598 | const char *xinopath = "/dev/shm/aufs.xino"; | |
599 | char **mntarray = NULL; | |
600 | struct mnts *m = NULL; | |
601 | ||
602 | m = add_mnt(&mnt_table, &mnt_table_size, type); | |
603 | if (!m) | |
604 | goto err; | |
605 | ||
606 | mntarray = lxc_string_split(mntstring, ':'); | |
607 | if (!mntarray) | |
608 | goto err; | |
609 | ||
610 | m->src = construct_path(mntarray[0], true); | |
611 | if (!m->src) | |
612 | goto err; | |
613 | ||
614 | len = lxc_array_len((void **)mntarray); | |
615 | if (len == 1) /* aufs=src */ | |
616 | m->dest = construct_path(mntarray[0], false); | |
617 | else if (len == 2) /* aufs=src:dest */ | |
618 | m->dest = construct_path(mntarray[1], false); | |
619 | else | |
620 | INFO("Excess elements in mount specification"); | |
621 | ||
622 | if (!m->dest) | |
623 | goto err; | |
624 | ||
625 | m->workdir = strdup(xinopath); | |
626 | if (!m->workdir) | |
627 | goto err; | |
628 | ||
629 | lxc_free_array((void **)mntarray, free); | |
630 | return 0; | |
631 | ||
632 | err: | |
633 | free_mnts(); | |
634 | lxc_free_array((void **)mntarray, free); | |
635 | return -1; | |
636 | } | |
637 | ||
638 | static int parse_bind_mnt(char *mntstring, enum mnttype type) | |
639 | { | |
640 | int len = 0; | |
641 | char **mntarray = NULL; | |
642 | struct mnts *m = NULL; | |
643 | ||
644 | m = add_mnt(&mnt_table, &mnt_table_size, type); | |
645 | if (!m) | |
646 | goto err; | |
647 | ||
648 | mntarray = lxc_string_split(mntstring, ':'); | |
649 | if (!mntarray) | |
650 | goto err; | |
651 | ||
652 | m->src = construct_path(mntarray[0], true); | |
653 | if (!m->src) | |
654 | goto err; | |
655 | ||
656 | len = lxc_array_len((void **)mntarray); | |
657 | if (len == 1) { /* bind=src */ | |
658 | m->dest = construct_path(mntarray[0], false); | |
659 | } else if (len == 2) { /* bind=src:option or bind=src:dest */ | |
660 | if (strncmp(mntarray[1], "rw", strlen(mntarray[1])) == 0) | |
661 | m->options = strdup("rw"); | |
662 | ||
663 | if (strncmp(mntarray[1], "ro", strlen(mntarray[1])) == 0) | |
664 | m->options = strdup("ro"); | |
665 | ||
666 | if (m->options) | |
667 | m->dest = construct_path(mntarray[0], false); | |
668 | else | |
669 | m->dest = construct_path(mntarray[1], false); | |
670 | } else if (len == 3) { /* bind=src:dest:option */ | |
671 | m->dest = construct_path(mntarray[1], false); | |
672 | m->options = strdup(mntarray[2]); | |
673 | } else { | |
674 | INFO("Excess elements in mount specification"); | |
675 | } | |
676 | ||
677 | if (!m->dest) | |
678 | goto err; | |
679 | ||
680 | if (!m->options) | |
681 | m->options = strdup("rw"); | |
682 | ||
683 | if (!m->options || (strncmp(m->options, "rw", strlen(m->options)) && | |
684 | strncmp(m->options, "ro", strlen(m->options)))) | |
685 | goto err; | |
686 | ||
687 | lxc_free_array((void **)mntarray, free); | |
688 | return 0; | |
689 | ||
690 | err: | |
691 | free_mnts(); | |
692 | lxc_free_array((void **)mntarray, free); | |
693 | return -1; | |
694 | } | |
695 | ||
696 | static int parse_mntsubopts(char *subopts, char *const *keys, char *mntparameters) | |
697 | { | |
698 | while (*subopts != '\0') { | |
699 | switch (getsubopt(&subopts, keys, &mntparameters)) { | |
700 | case LXC_MNT_BIND: | |
701 | if (parse_bind_mnt(mntparameters, LXC_MNT_BIND) < 0) | |
702 | return -1; | |
703 | break; | |
704 | case LXC_MNT_OVL: | |
705 | if (parse_ovl_mnt(mntparameters, LXC_MNT_OVL) < 0) | |
706 | return -1; | |
707 | break; | |
708 | case LXC_MNT_AUFS: | |
709 | if (parse_aufs_mnt(mntparameters, LXC_MNT_AUFS) < 0) | |
710 | return -1; | |
711 | break; | |
712 | default: | |
713 | break; | |
714 | } | |
715 | } | |
716 | return 0; | |
717 | } | |
718 | ||
719 | static int parse_ovl_mnt(char *mntstring, enum mnttype type) | |
720 | { | |
721 | int len = 0; | |
722 | char **mntarray = NULL; | |
723 | struct mnts *m; | |
724 | ||
725 | m = add_mnt(&mnt_table, &mnt_table_size, type); | |
726 | if (!m) | |
727 | goto err; | |
728 | ||
729 | mntarray = lxc_string_split(mntstring, ':'); | |
730 | if (!mntarray) | |
731 | goto err; | |
732 | ||
733 | m->src = construct_path(mntarray[0], true); | |
734 | if (!m->src) | |
735 | goto err; | |
736 | ||
737 | len = lxc_array_len((void **)mntarray); | |
738 | if (len == 1) /* overlay=src */ | |
739 | m->dest = construct_path(mntarray[0], false); | |
740 | else if (len == 2) /* overlay=src:dest */ | |
741 | m->dest = construct_path(mntarray[1], false); | |
742 | else | |
743 | INFO("Excess elements in mount specification"); | |
744 | ||
745 | if (!m->dest) | |
746 | goto err; | |
747 | ||
748 | lxc_free_array((void **)mntarray, free); | |
749 | return 0; | |
750 | ||
751 | err: | |
752 | free_mnts(); | |
753 | lxc_free_array((void **)mntarray, free); | |
754 | return -1; | |
755 | } |