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Commit | Line | Data |
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43cea62d CB |
1 | /* |
2 | * | |
8130ebe8 | 3 | * Copyright © 2015 Christian Brauner <christian.brauner@mailbox.org>. |
43cea62d CB |
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 | |
9dbcd668 SG |
20 | #include "config.h" |
21 | ||
43cea62d CB |
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" | |
d8e48992 | 40 | #include "bdev.h" |
43cea62d CB |
41 | #include "log.h" |
42 | #include "confile.h" | |
43 | #include "arguments.h" | |
44 | #include "lxc.h" | |
45 | #include "conf.h" | |
46 | #include "state.h" | |
47 | #include "utils.h" | |
43cea62d | 48 | |
9dbcd668 SG |
49 | #ifndef HAVE_GETSUBOPT |
50 | #include <../include/getsubopt.h> | |
51 | #endif | |
52 | ||
43cea62d CB |
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 { | |
8130ebe8 | 62 | enum mnttype mnt_type; |
43cea62d CB |
63 | char *src; |
64 | char *dest; | |
65 | char *options; | |
66 | char *upper; | |
67 | char *workdir; | |
68 | char *lower; | |
69 | }; | |
70 | ||
8130ebe8 CB |
71 | static unsigned int mnt_table_size = 0; |
72 | static struct mnts *mnt_table = NULL; | |
43cea62d CB |
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'}, | |
60a77c18 | 90 | { "tmpfs", no_argument, 0, 't'}, |
43cea62d CB |
91 | LXC_COMMON_OPTIONS |
92 | }; | |
93 | ||
94 | /* mount keys */ | |
95 | static char *const keys[] = { | |
96 | [LXC_MNT_BIND] = "bind", | |
97 | [LXC_MNT_AUFS] = "aufs", | |
98 | [LXC_MNT_OVL] = "overlay", | |
99 | NULL | |
100 | }; | |
101 | ||
102 | static struct lxc_arguments my_args = { | |
103 | .progname = "lxc-copy", | |
2b47bac3 | 104 | .help = "\n\ |
a372480c CB |
105 | --name=NAME [-P lxcpath] -N newname [-p newpath] [-B backingstorage] [-s] [-K] [-M] [-L size [unit]] -- hook options\n\ |
106 | --name=NAME [-P lxcpath] [-N newname] [-p newpath] [-B backingstorage] -e [-d] [-D] [-K] [-M] [-m {bind,aufs,overlay}=/src:/dest] -- hook options\n\ | |
43cea62d CB |
107 | --name=NAME [-P lxcpath] -N newname -R\n\ |
108 | \n\ | |
109 | lxc-copy clone a container\n\ | |
110 | \n\ | |
111 | Options :\n\ | |
112 | -n, --name=NAME NAME of the container\n\ | |
113 | -N, --newname=NEWNAME NEWNAME for the restored container\n\ | |
114 | -p, --newpath=NEWPATH NEWPATH for the container to be stored\n\ | |
115 | -R, --rename rename container\n\ | |
116 | -s, --snapshot create snapshot instead of clone\n\ | |
117 | -F, --foreground start with current tty attached to /dev/console\n\ | |
118 | -d, --daemon daemonize the container (default)\n\ | |
119 | -e, --ephemeral start ephemeral container\n\ | |
120 | -m, --mount directory to mount into container, either \n\ | |
121 | {bind,aufs,overlay}=/src-path or {bind,aufs,overlay}=/src-path:/dst-path\n\ | |
122 | -B, --backingstorage=TYPE backingstorage type for the container\n\ | |
60a77c18 CB |
123 | -t, --tmpfs place ephemeral container on a tmpfs\n\ |
124 | (WARNING: On reboot all changes made to the container will be lost.)\n\ | |
43cea62d CB |
125 | -L, --fssize size of the new block device for block device containers\n\ |
126 | -D, --keedata pass together with -e start a persistent snapshot \n\ | |
127 | -K, --keepname keep the hostname of the original container\n\ | |
a372480c | 128 | -- hook options arguments passed to the hook program\n\ |
50b737a3 WB |
129 | -M, --keepmac keep the MAC address of the original container\n\ |
130 | --rcfile=FILE Load configuration file FILE\n", | |
43cea62d CB |
131 | .options = my_longopts, |
132 | .parser = my_parser, | |
133 | .task = CLONE, | |
134 | .daemonize = 1, | |
c89f1f75 | 135 | .quiet = false, |
60a77c18 | 136 | .tmpfs = false, |
43cea62d CB |
137 | }; |
138 | ||
139 | static struct mnts *add_mnt(struct mnts **mnts, unsigned int *num, | |
140 | enum mnttype type); | |
8130ebe8 CB |
141 | static int mk_rand_ovl_dirs(struct mnts *mnts, unsigned int num, |
142 | struct lxc_arguments *arg); | |
43cea62d CB |
143 | static char *construct_path(char *path, bool as_prefix); |
144 | static char *set_mnt_entry(struct mnts *m); | |
145 | static int do_clone(struct lxc_container *c, char *newname, char *newpath, | |
146 | int flags, char *bdevtype, uint64_t fssize, enum task task, | |
147 | char **args); | |
148 | static int do_clone_ephemeral(struct lxc_container *c, | |
8130ebe8 | 149 | struct lxc_arguments *arg, char **args, |
43cea62d CB |
150 | int flags); |
151 | static int do_clone_rename(struct lxc_container *c, char *newname); | |
152 | static int do_clone_task(struct lxc_container *c, enum task task, int flags, | |
153 | char **args); | |
534dfdeb | 154 | static void free_mnts(void); |
43cea62d | 155 | static uint64_t get_fssize(char *s); |
60a77c18 CB |
156 | |
157 | /* Place an ephemeral container started with -e flag on a tmpfs. Restrictions | |
158 | * are that you cannot request the data to be kept while placing the container | |
159 | * on a tmpfs and that either overlay or aufs backing storage must be used. | |
160 | */ | |
161 | static char *mount_tmpfs(const char *oldname, const char *newname, | |
162 | const char *path, struct lxc_arguments *arg); | |
43cea62d CB |
163 | static int parse_mntsubopts(char *subopts, char *const *keys, |
164 | char *mntparameters); | |
165 | static int parse_aufs_mnt(char *mntstring, enum mnttype type); | |
166 | static int parse_bind_mnt(char *mntstring, enum mnttype type); | |
167 | static int parse_ovl_mnt(char *mntstring, enum mnttype type); | |
168 | ||
169 | int main(int argc, char *argv[]) | |
170 | { | |
171 | struct lxc_container *c; | |
172 | int flags = 0; | |
534dfdeb | 173 | int ret = EXIT_FAILURE; |
43cea62d CB |
174 | |
175 | if (lxc_arguments_parse(&my_args, argc, argv)) | |
534dfdeb | 176 | exit(ret); |
43cea62d CB |
177 | |
178 | if (!my_args.log_file) | |
179 | my_args.log_file = "none"; | |
180 | ||
181 | if (lxc_log_init(my_args.name, my_args.log_file, my_args.log_priority, | |
182 | my_args.progname, my_args.quiet, my_args.lxcpath[0])) | |
534dfdeb | 183 | exit(ret); |
43cea62d CB |
184 | lxc_log_options_no_override(); |
185 | ||
186 | if (geteuid()) { | |
187 | if (access(my_args.lxcpath[0], O_RDWR) < 0) { | |
c89f1f75 CB |
188 | if (!my_args.quiet) |
189 | fprintf(stderr, "You lack access to %s\n", my_args.lxcpath[0]); | |
534dfdeb | 190 | exit(ret); |
43cea62d CB |
191 | } |
192 | } | |
193 | ||
194 | if (!my_args.newname && !(my_args.task == DESTROY)) { | |
c89f1f75 CB |
195 | if (!my_args.quiet) |
196 | printf("Error: You must provide a NEWNAME for the clone.\n"); | |
534dfdeb | 197 | exit(ret); |
43cea62d CB |
198 | } |
199 | ||
200 | if (my_args.task == SNAP || my_args.task == DESTROY) | |
201 | flags |= LXC_CLONE_SNAPSHOT; | |
202 | if (my_args.keepname) | |
203 | flags |= LXC_CLONE_KEEPNAME; | |
204 | if (my_args.keepmac) | |
205 | flags |= LXC_CLONE_KEEPMACADDR; | |
206 | ||
207 | if (!my_args.newpath) | |
208 | my_args.newpath = (char *)my_args.lxcpath[0]; | |
209 | ||
210 | c = lxc_container_new(my_args.name, my_args.lxcpath[0]); | |
211 | if (!c) | |
534dfdeb | 212 | exit(ret); |
43cea62d | 213 | |
50b737a3 WB |
214 | if (my_args.rcfile) { |
215 | c->clear_config(c); | |
216 | if (!c->load_config(c, my_args.rcfile)) { | |
217 | fprintf(stderr, "Failed to load rcfile\n"); | |
218 | goto out; | |
219 | } | |
220 | } | |
221 | ||
43cea62d | 222 | if (!c->may_control(c)) { |
c89f1f75 CB |
223 | if (!my_args.quiet) |
224 | fprintf(stderr, "Insufficent privileges to control %s\n", c->name); | |
534dfdeb | 225 | goto out; |
43cea62d CB |
226 | } |
227 | ||
228 | if (!c->is_defined(c)) { | |
c89f1f75 CB |
229 | if (!my_args.quiet) |
230 | fprintf(stderr, "Error: container %s is not defined\n", c->name); | |
534dfdeb | 231 | goto out; |
43cea62d CB |
232 | } |
233 | ||
234 | ret = do_clone_task(c, my_args.task, flags, &argv[optind]); | |
235 | ||
534dfdeb | 236 | out: |
43cea62d CB |
237 | lxc_container_put(c); |
238 | ||
239 | if (ret == 0) | |
240 | exit(EXIT_SUCCESS); | |
241 | exit(EXIT_FAILURE); | |
242 | } | |
243 | ||
244 | static struct mnts *add_mnt(struct mnts **mnts, unsigned int *num, enum mnttype type) | |
245 | { | |
246 | struct mnts *m, *n; | |
247 | ||
248 | n = realloc(*mnts, (*num + 1) * sizeof(struct mnts)); | |
249 | if (!n) | |
250 | return NULL; | |
251 | ||
252 | *mnts = n; | |
253 | m = *mnts + *num; | |
254 | (*num)++; | |
255 | ||
8130ebe8 | 256 | *m = (struct mnts) {.mnt_type = type}; |
43cea62d CB |
257 | |
258 | return m; | |
259 | } | |
260 | ||
8130ebe8 | 261 | static int mk_rand_ovl_dirs(struct mnts *mnts, unsigned int num, struct lxc_arguments *arg) |
43cea62d CB |
262 | { |
263 | char upperdir[MAXPATHLEN]; | |
264 | char workdir[MAXPATHLEN]; | |
265 | unsigned int i; | |
534dfdeb CB |
266 | int ret; |
267 | struct mnts *m = NULL; | |
43cea62d | 268 | |
534dfdeb | 269 | for (i = 0, m = mnts; i < num; i++, m++) { |
8130ebe8 | 270 | if ((m->mnt_type == LXC_MNT_OVL) || (m->mnt_type == LXC_MNT_AUFS)) { |
43cea62d | 271 | ret = snprintf(upperdir, MAXPATHLEN, "%s/%s/delta#XXXXXX", |
8130ebe8 | 272 | arg->newpath, arg->newname); |
43cea62d | 273 | if (ret < 0 || ret >= MAXPATHLEN) |
534dfdeb | 274 | return -1; |
43cea62d | 275 | if (!mkdtemp(upperdir)) |
534dfdeb | 276 | return -1; |
43cea62d CB |
277 | m->upper = strdup(upperdir); |
278 | if (!m->upper) | |
534dfdeb | 279 | return -1; |
43cea62d CB |
280 | } |
281 | ||
8130ebe8 | 282 | if (m->mnt_type == LXC_MNT_OVL) { |
43cea62d | 283 | ret = snprintf(workdir, MAXPATHLEN, "%s/%s/work#XXXXXX", |
8130ebe8 | 284 | arg->newpath, arg->newname); |
43cea62d | 285 | if (ret < 0 || ret >= MAXPATHLEN) |
534dfdeb | 286 | return -1; |
43cea62d | 287 | if (!mkdtemp(workdir)) |
534dfdeb | 288 | return -1; |
43cea62d CB |
289 | m->workdir = strdup(workdir); |
290 | if (!m->workdir) | |
534dfdeb | 291 | return -1; |
43cea62d CB |
292 | } |
293 | } | |
294 | ||
295 | return 0; | |
43cea62d CB |
296 | } |
297 | ||
298 | static char *construct_path(char *path, bool as_prefix) | |
299 | { | |
300 | char **components = NULL; | |
301 | char *cleanpath = NULL; | |
302 | ||
303 | components = lxc_normalize_path(path); | |
304 | if (!components) | |
305 | return NULL; | |
306 | ||
307 | cleanpath = lxc_string_join("/", (const char **)components, as_prefix); | |
308 | lxc_free_array((void **)components, free); | |
309 | ||
310 | return cleanpath; | |
311 | } | |
312 | ||
313 | static char *set_mnt_entry(struct mnts *m) | |
314 | { | |
315 | char *mntentry = NULL; | |
316 | int ret = 0; | |
317 | size_t len = 0; | |
318 | ||
8130ebe8 | 319 | if (m->mnt_type == LXC_MNT_AUFS) { |
43cea62d CB |
320 | len = strlen(" aufs br==rw:=ro,xino=,create=dir") + |
321 | 2 * strlen(m->src) + strlen(m->dest) + strlen(m->upper) + | |
322 | strlen(m->workdir) + 1; | |
323 | ||
324 | mntentry = malloc(len); | |
325 | if (!mntentry) | |
326 | goto err; | |
327 | ||
328 | ret = snprintf(mntentry, len, "%s %s aufs br=%s=rw:%s=ro,xino=%s,create=dir", | |
329 | m->src, m->dest, m->upper, m->src, m->workdir); | |
330 | if (ret < 0 || (size_t)ret >= len) | |
331 | goto err; | |
8130ebe8 | 332 | } else if (m->mnt_type == LXC_MNT_OVL) { |
43cea62d CB |
333 | len = strlen(" overlay lowerdir=,upperdir=,workdir=,create=dir") + |
334 | 2 * strlen(m->src) + strlen(m->dest) + strlen(m->upper) + | |
335 | strlen(m->workdir) + 1; | |
336 | ||
337 | mntentry = malloc(len); | |
338 | if (!mntentry) | |
339 | goto err; | |
340 | ||
341 | ret = snprintf(mntentry, len, "%s %s overlay lowerdir=%s,upperdir=%s,workdir=%s,create=dir", | |
342 | m->src, m->dest, m->src, m->upper, m->workdir); | |
343 | if (ret < 0 || (size_t)ret >= len) | |
344 | goto err; | |
8130ebe8 | 345 | } else if (m->mnt_type == LXC_MNT_BIND) { |
43cea62d CB |
346 | len = strlen(" none bind,optional,, 0 0") + |
347 | strlen(is_dir(m->src) ? "create=dir" : "create=file") + | |
348 | strlen(m->src) + strlen(m->dest) + strlen(m->options) + 1; | |
349 | ||
350 | mntentry = malloc(len); | |
351 | if (!mntentry) | |
352 | goto err; | |
353 | ||
354 | ret = snprintf(mntentry, len, "%s %s none bind,optional,%s,%s 0 0", | |
355 | m->src, m->dest, m->options, | |
356 | is_dir(m->src) ? "create=dir" : "create=file"); | |
357 | if (ret < 0 || (size_t)ret >= len) | |
358 | goto err; | |
359 | } | |
360 | ||
361 | return mntentry; | |
362 | ||
363 | err: | |
43cea62d CB |
364 | free(mntentry); |
365 | return NULL; | |
366 | } | |
367 | ||
368 | static int do_clone(struct lxc_container *c, char *newname, char *newpath, | |
369 | int flags, char *bdevtype, uint64_t fssize, enum task task, | |
370 | char **args) | |
371 | { | |
372 | struct lxc_container *clone; | |
373 | ||
374 | clone = c->clone(c, newname, newpath, flags, bdevtype, NULL, fssize, | |
375 | args); | |
376 | if (!clone) { | |
c89f1f75 CB |
377 | if (!my_args.quiet) |
378 | fprintf(stderr, "clone failed\n"); | |
43cea62d CB |
379 | return -1; |
380 | } | |
381 | ||
5a8929b1 | 382 | INFO("Created %s as %s of %s\n", newname, task ? "snapshot" : "copy", c->name); |
43cea62d CB |
383 | |
384 | lxc_container_put(clone); | |
385 | ||
386 | return 0; | |
387 | } | |
388 | ||
389 | static int do_clone_ephemeral(struct lxc_container *c, | |
534dfdeb | 390 | struct lxc_arguments *arg, char **args, int flags) |
43cea62d | 391 | { |
60a77c18 CB |
392 | char *bdev; |
393 | char *premount; | |
43cea62d CB |
394 | char randname[MAXPATHLEN]; |
395 | unsigned int i; | |
396 | int ret = 0; | |
534dfdeb | 397 | bool bret = true, started = false; |
43cea62d | 398 | struct lxc_container *clone; |
43cea62d CB |
399 | lxc_attach_options_t attach_options = LXC_ATTACH_OPTIONS_DEFAULT; |
400 | attach_options.env_policy = LXC_ATTACH_CLEAR_ENV; | |
401 | ||
8130ebe8 CB |
402 | if (!arg->newname) { |
403 | ret = snprintf(randname, MAXPATHLEN, "%s/%s_XXXXXX", arg->newpath, arg->name); | |
43cea62d CB |
404 | if (ret < 0 || ret >= MAXPATHLEN) |
405 | return -1; | |
406 | if (!mkdtemp(randname)) | |
407 | return -1; | |
534dfdeb CB |
408 | if (chmod(randname, 0770) < 0) { |
409 | remove(randname); | |
b84e8c4b | 410 | return -1; |
534dfdeb | 411 | } |
8130ebe8 | 412 | arg->newname = randname + strlen(arg->newpath) + 1; |
43cea62d CB |
413 | } |
414 | ||
8130ebe8 CB |
415 | clone = c->clone(c, arg->newname, arg->newpath, flags, |
416 | arg->bdevtype, NULL, arg->fssize, args); | |
43cea62d | 417 | if (!clone) |
dca0532e | 418 | return -1; |
43cea62d | 419 | |
60a77c18 CB |
420 | if (arg->tmpfs) { |
421 | bdev = c->lxc_conf->rootfs.bdev_type; | |
422 | if (bdev && strcmp(bdev, "dir")) { | |
423 | fprintf(stderr, "Cannot currently use tmpfs with %s storage backend.\n", bdev); | |
424 | goto destroy_and_put; | |
425 | } | |
426 | ||
427 | premount = mount_tmpfs(arg->name, arg->newname, arg->newpath, arg); | |
428 | if (!premount) | |
429 | goto destroy_and_put; | |
430 | ||
431 | bret = clone->set_config_item(clone, "lxc.hook.pre-mount", premount); | |
432 | free(premount); | |
433 | if (!bret) | |
434 | goto destroy_and_put; | |
435 | } | |
436 | ||
8130ebe8 | 437 | if (!arg->keepdata) |
43cea62d | 438 | if (!clone->set_config_item(clone, "lxc.ephemeral", "1")) |
534dfdeb | 439 | goto destroy_and_put; |
43cea62d CB |
440 | |
441 | /* allocate and create random upper- and workdirs for overlay mounts */ | |
8130ebe8 | 442 | if (mk_rand_ovl_dirs(mnt_table, mnt_table_size, arg) < 0) |
534dfdeb | 443 | goto destroy_and_put; |
43cea62d CB |
444 | |
445 | /* allocate and set mount entries */ | |
534dfdeb CB |
446 | struct mnts *n = NULL; |
447 | for (i = 0, n = mnt_table; i < mnt_table_size; i++, n++) { | |
43cea62d | 448 | char *mntentry = NULL; |
534dfdeb CB |
449 | mntentry = set_mnt_entry(n); |
450 | if (!mntentry) | |
451 | goto destroy_and_put; | |
452 | bret = clone->set_config_item(clone, "lxc.mount.entry", mntentry); | |
453 | free(mntentry); | |
454 | if (!bret) | |
455 | goto destroy_and_put; | |
43cea62d CB |
456 | } |
457 | ||
458 | if (!clone->save_config(clone, NULL)) | |
534dfdeb | 459 | goto destroy_and_put; |
43cea62d | 460 | |
c89f1f75 | 461 | if (!my_args.quiet) |
5a8929b1 | 462 | printf("Created %s as clone of %s\n", arg->newname, arg->name); |
43cea62d | 463 | |
60a77c18 CB |
464 | if (arg->tmpfs && !my_args.quiet) |
465 | printf("Container is placed on tmpfs.\nRebooting will cause " | |
b44c42e8 | 466 | "all changes made to it to be lost!\n"); |
60a77c18 | 467 | |
8130ebe8 | 468 | if (!arg->daemonize && arg->argc) { |
43cea62d | 469 | clone->want_daemonize(clone, true); |
8130ebe8 CB |
470 | arg->daemonize = 1; |
471 | } else if (!arg->daemonize) { | |
43cea62d CB |
472 | clone->want_daemonize(clone, false); |
473 | } | |
474 | ||
534dfdeb CB |
475 | started = clone->start(clone, 0, NULL); |
476 | if (!started) | |
477 | goto destroy_and_put; | |
43cea62d | 478 | |
8130ebe8 CB |
479 | if (arg->daemonize && arg->argc) { |
480 | ret = clone->attach_run_wait(clone, &attach_options, arg->argv[0], (const char *const *)arg->argv); | |
43cea62d | 481 | if (ret < 0) |
534dfdeb CB |
482 | goto destroy_and_put; |
483 | clone->shutdown(clone, -1); | |
43cea62d CB |
484 | } |
485 | ||
534dfdeb | 486 | free_mnts(); |
43cea62d CB |
487 | lxc_container_put(clone); |
488 | return 0; | |
489 | ||
534dfdeb CB |
490 | destroy_and_put: |
491 | if (started) | |
492 | clone->shutdown(clone, -1); | |
493 | if (!started || clone->lxc_conf->ephemeral != 1) | |
494 | clone->destroy(clone); | |
495 | free_mnts(); | |
43cea62d CB |
496 | lxc_container_put(clone); |
497 | return -1; | |
498 | } | |
499 | ||
500 | static int do_clone_rename(struct lxc_container *c, char *newname) | |
501 | { | |
502 | if (!c->rename(c, newname)) { | |
503 | ERROR("Error: Renaming container %s to %s failed\n", c->name, newname); | |
504 | return -1; | |
505 | } | |
506 | ||
507 | INFO("Renamed container %s to %s\n", c->name, newname); | |
508 | ||
509 | return 0; | |
510 | } | |
511 | ||
512 | static int do_clone_task(struct lxc_container *c, enum task task, int flags, | |
513 | char **args) | |
514 | { | |
515 | int ret = 0; | |
516 | ||
517 | switch (task) { | |
518 | case DESTROY: | |
519 | ret = do_clone_ephemeral(c, &my_args, args, flags); | |
520 | break; | |
521 | case RENAME: | |
522 | ret = do_clone_rename(c, my_args.newname); | |
523 | break; | |
524 | default: | |
525 | ret = do_clone(c, my_args.newname, my_args.newpath, flags, | |
526 | my_args.bdevtype, my_args.fssize, my_args.task, | |
527 | args); | |
528 | break; | |
529 | } | |
530 | ||
531 | return ret; | |
532 | } | |
533 | ||
534dfdeb | 534 | static void free_mnts() |
43cea62d CB |
535 | { |
536 | unsigned int i; | |
534dfdeb | 537 | struct mnts *n = NULL; |
43cea62d | 538 | |
534dfdeb | 539 | for (i = 0, n = mnt_table; i < mnt_table_size; i++, n++) { |
43cea62d CB |
540 | free(n->src); |
541 | free(n->dest); | |
542 | free(n->options); | |
543 | free(n->upper); | |
544 | free(n->workdir); | |
545 | } | |
534dfdeb CB |
546 | free(mnt_table); |
547 | mnt_table = NULL; | |
548 | mnt_table_size = 0; | |
43cea62d CB |
549 | } |
550 | ||
551 | /* we pass fssize in bytes */ | |
552 | static uint64_t get_fssize(char *s) | |
553 | { | |
554 | uint64_t ret; | |
555 | char *end; | |
556 | ||
557 | ret = strtoull(s, &end, 0); | |
558 | if (end == s) { | |
c89f1f75 CB |
559 | if (!my_args.quiet) |
560 | fprintf(stderr, "Invalid blockdev size '%s', using default size\n", s); | |
43cea62d CB |
561 | return 0; |
562 | } | |
563 | while (isblank(*end)) | |
564 | end++; | |
565 | if (*end == '\0') { | |
566 | ret *= 1024ULL * 1024ULL; // MB by default | |
567 | } else if (*end == 'b' || *end == 'B') { | |
568 | ret *= 1ULL; | |
569 | } else if (*end == 'k' || *end == 'K') { | |
570 | ret *= 1024ULL; | |
571 | } else if (*end == 'm' || *end == 'M') { | |
572 | ret *= 1024ULL * 1024ULL; | |
573 | } else if (*end == 'g' || *end == 'G') { | |
574 | ret *= 1024ULL * 1024ULL * 1024ULL; | |
575 | } else if (*end == 't' || *end == 'T') { | |
576 | ret *= 1024ULL * 1024ULL * 1024ULL * 1024ULL; | |
577 | } else { | |
c89f1f75 CB |
578 | if (!my_args.quiet) |
579 | fprintf(stderr, "Invalid blockdev unit size '%c' in '%s', " "using default size\n", *end, s); | |
43cea62d CB |
580 | return 0; |
581 | } | |
582 | ||
583 | return ret; | |
584 | } | |
585 | ||
586 | static int my_parser(struct lxc_arguments *args, int c, char *arg) | |
587 | { | |
588 | char *subopts = NULL; | |
589 | char *mntparameters = NULL; | |
590 | switch (c) { | |
591 | case 'N': | |
592 | args->newname = arg; | |
593 | break; | |
594 | case 'p': | |
595 | args->newpath = arg; | |
596 | break; | |
597 | case 'R': | |
598 | args->task = RENAME; | |
599 | break; | |
600 | case 's': | |
601 | args->task = SNAP; | |
602 | break; | |
603 | case 'F': | |
604 | args->daemonize = 0; | |
605 | break; | |
606 | case 'd': | |
607 | args->daemonize = 1; | |
608 | break; | |
609 | case 'e': | |
610 | args->task = DESTROY; | |
611 | break; | |
612 | case 'm': | |
613 | subopts = optarg; | |
614 | if (parse_mntsubopts(subopts, keys, mntparameters) < 0) | |
615 | return -1; | |
616 | break; | |
617 | case 'B': | |
618 | args->bdevtype = arg; | |
619 | break; | |
60a77c18 CB |
620 | case 't': |
621 | args->tmpfs = true; | |
622 | break; | |
43cea62d CB |
623 | case 'L': |
624 | args->fssize = get_fssize(optarg); | |
625 | break; | |
626 | case 'D': | |
627 | args->keepdata = 1; | |
628 | break; | |
629 | case 'K': | |
630 | args->keepname = 1; | |
631 | break; | |
632 | case 'M': | |
633 | args->keepmac = 1; | |
634 | break; | |
635 | } | |
636 | ||
637 | return 0; | |
638 | } | |
639 | ||
640 | static int parse_aufs_mnt(char *mntstring, enum mnttype type) | |
641 | { | |
642 | int len = 0; | |
643 | const char *xinopath = "/dev/shm/aufs.xino"; | |
644 | char **mntarray = NULL; | |
645 | struct mnts *m = NULL; | |
646 | ||
8130ebe8 | 647 | m = add_mnt(&mnt_table, &mnt_table_size, type); |
43cea62d CB |
648 | if (!m) |
649 | goto err; | |
650 | ||
651 | mntarray = lxc_string_split(mntstring, ':'); | |
652 | if (!mntarray) | |
653 | goto err; | |
654 | ||
655 | m->src = construct_path(mntarray[0], true); | |
656 | if (!m->src) | |
657 | goto err; | |
658 | ||
659 | len = lxc_array_len((void **)mntarray); | |
660 | if (len == 1) /* aufs=src */ | |
661 | m->dest = construct_path(mntarray[0], false); | |
662 | else if (len == 2) /* aufs=src:dest */ | |
663 | m->dest = construct_path(mntarray[1], false); | |
664 | else | |
665 | INFO("Excess elements in mount specification"); | |
666 | ||
667 | if (!m->dest) | |
668 | goto err; | |
669 | ||
670 | m->workdir = strdup(xinopath); | |
671 | if (!m->workdir) | |
672 | goto err; | |
673 | ||
674 | lxc_free_array((void **)mntarray, free); | |
675 | return 0; | |
676 | ||
677 | err: | |
534dfdeb | 678 | free_mnts(); |
43cea62d CB |
679 | lxc_free_array((void **)mntarray, free); |
680 | return -1; | |
681 | } | |
682 | ||
683 | static int parse_bind_mnt(char *mntstring, enum mnttype type) | |
684 | { | |
685 | int len = 0; | |
686 | char **mntarray = NULL; | |
687 | struct mnts *m = NULL; | |
688 | ||
8130ebe8 | 689 | m = add_mnt(&mnt_table, &mnt_table_size, type); |
43cea62d CB |
690 | if (!m) |
691 | goto err; | |
692 | ||
693 | mntarray = lxc_string_split(mntstring, ':'); | |
694 | if (!mntarray) | |
695 | goto err; | |
696 | ||
697 | m->src = construct_path(mntarray[0], true); | |
698 | if (!m->src) | |
699 | goto err; | |
700 | ||
701 | len = lxc_array_len((void **)mntarray); | |
702 | if (len == 1) { /* bind=src */ | |
703 | m->dest = construct_path(mntarray[0], false); | |
704 | } else if (len == 2) { /* bind=src:option or bind=src:dest */ | |
705 | if (strncmp(mntarray[1], "rw", strlen(mntarray[1])) == 0) | |
706 | m->options = strdup("rw"); | |
707 | ||
708 | if (strncmp(mntarray[1], "ro", strlen(mntarray[1])) == 0) | |
709 | m->options = strdup("ro"); | |
710 | ||
711 | if (m->options) | |
712 | m->dest = construct_path(mntarray[0], false); | |
713 | else | |
714 | m->dest = construct_path(mntarray[1], false); | |
715 | } else if (len == 3) { /* bind=src:dest:option */ | |
716 | m->dest = construct_path(mntarray[1], false); | |
717 | m->options = strdup(mntarray[2]); | |
718 | } else { | |
719 | INFO("Excess elements in mount specification"); | |
720 | } | |
721 | ||
722 | if (!m->dest) | |
723 | goto err; | |
724 | ||
725 | if (!m->options) | |
726 | m->options = strdup("rw"); | |
727 | ||
728 | if (!m->options || (strncmp(m->options, "rw", strlen(m->options)) && | |
729 | strncmp(m->options, "ro", strlen(m->options)))) | |
730 | goto err; | |
731 | ||
732 | lxc_free_array((void **)mntarray, free); | |
733 | return 0; | |
734 | ||
735 | err: | |
534dfdeb | 736 | free_mnts(); |
43cea62d CB |
737 | lxc_free_array((void **)mntarray, free); |
738 | return -1; | |
739 | } | |
740 | ||
741 | static int parse_mntsubopts(char *subopts, char *const *keys, char *mntparameters) | |
742 | { | |
743 | while (*subopts != '\0') { | |
744 | switch (getsubopt(&subopts, keys, &mntparameters)) { | |
745 | case LXC_MNT_BIND: | |
746 | if (parse_bind_mnt(mntparameters, LXC_MNT_BIND) < 0) | |
747 | return -1; | |
748 | break; | |
749 | case LXC_MNT_OVL: | |
750 | if (parse_ovl_mnt(mntparameters, LXC_MNT_OVL) < 0) | |
751 | return -1; | |
752 | break; | |
753 | case LXC_MNT_AUFS: | |
754 | if (parse_aufs_mnt(mntparameters, LXC_MNT_AUFS) < 0) | |
755 | return -1; | |
756 | break; | |
757 | default: | |
758 | break; | |
759 | } | |
760 | } | |
761 | return 0; | |
762 | } | |
763 | ||
764 | static int parse_ovl_mnt(char *mntstring, enum mnttype type) | |
765 | { | |
766 | int len = 0; | |
767 | char **mntarray = NULL; | |
768 | struct mnts *m; | |
769 | ||
8130ebe8 | 770 | m = add_mnt(&mnt_table, &mnt_table_size, type); |
43cea62d CB |
771 | if (!m) |
772 | goto err; | |
773 | ||
774 | mntarray = lxc_string_split(mntstring, ':'); | |
775 | if (!mntarray) | |
776 | goto err; | |
777 | ||
778 | m->src = construct_path(mntarray[0], true); | |
779 | if (!m->src) | |
780 | goto err; | |
781 | ||
782 | len = lxc_array_len((void **)mntarray); | |
783 | if (len == 1) /* overlay=src */ | |
784 | m->dest = construct_path(mntarray[0], false); | |
785 | else if (len == 2) /* overlay=src:dest */ | |
786 | m->dest = construct_path(mntarray[1], false); | |
787 | else | |
788 | INFO("Excess elements in mount specification"); | |
789 | ||
790 | if (!m->dest) | |
791 | goto err; | |
792 | ||
793 | lxc_free_array((void **)mntarray, free); | |
794 | return 0; | |
795 | ||
796 | err: | |
534dfdeb | 797 | free_mnts(); |
43cea62d CB |
798 | lxc_free_array((void **)mntarray, free); |
799 | return -1; | |
800 | } | |
60a77c18 CB |
801 | |
802 | /* For ephemeral snapshots backed by overlay or aufs filesystems, this function | |
803 | * mounts a fresh tmpfs over the containers directory if the user requests it. | |
804 | * Because we mount a fresh tmpfs over the directory of the container the | |
805 | * updated /etc/hostname file created during the clone residing in the upperdir | |
806 | * (currently named "delta0" by default) will be hidden. Hence, if the user | |
807 | * requests that the old name is not to be kept for the clone, we recreate this | |
808 | * file on the tmpfs. This should be all that is required to restore the exact | |
809 | * behaviour we would get with a normal clone. | |
810 | */ | |
811 | static char *mount_tmpfs(const char *oldname, const char *newname, | |
812 | const char *path, struct lxc_arguments *arg) | |
813 | { | |
814 | int ret, fd; | |
815 | size_t len; | |
816 | char *premount = NULL; | |
a8e279fd | 817 | FILE *fp; |
60a77c18 CB |
818 | |
819 | if (arg->tmpfs && arg->keepdata) { | |
820 | fprintf(stderr, "%s\n", "A container can only be placed on a " | |
821 | "tmpfs when storage backend is overlay " | |
822 | "or aufs."); | |
823 | goto err_free; | |
824 | } | |
825 | ||
826 | if (arg->tmpfs && !arg->bdevtype) { | |
827 | arg->bdevtype = "overlayfs"; | |
828 | } else if (arg->tmpfs && arg->bdevtype && strcmp(arg->bdevtype, "overlayfs") && strcmp(arg->bdevtype, "aufs")) { | |
829 | fprintf(stderr, "%s\n", "A container can only be placed on a " | |
830 | "tmpfs when storage backend is overlay " | |
831 | "or aufs."); | |
832 | goto err_free; | |
833 | } | |
834 | ||
835 | len = strlen(path) + strlen(newname) + strlen("pre-start-XXXXXX") + /* //\0 */ 3; | |
836 | premount = malloc(len); | |
837 | if (!premount) | |
838 | goto err_free; | |
839 | ||
840 | ret = snprintf(premount, len, "%s/%s/pre-start-XXXXXX", path, newname); | |
841 | if (ret < 0 || (size_t)ret >= len) | |
842 | goto err_free; | |
843 | ||
a8e279fd | 844 | fd = mkstemp(premount); |
60a77c18 CB |
845 | if (fd < 0) |
846 | goto err_free; | |
847 | ||
a8e279fd CB |
848 | if (fcntl(fd, F_SETFD, FD_CLOEXEC)) { |
849 | SYSERROR("Failed to set close-on-exec on file descriptor."); | |
850 | goto err_close; | |
851 | } | |
852 | ||
60a77c18 CB |
853 | if (chmod(premount, 0755) < 0) |
854 | goto err_close; | |
855 | ||
a8e279fd CB |
856 | fp = fdopen(fd, "r+"); |
857 | if (!fp) | |
858 | goto err_close; | |
859 | fd = -1; | |
860 | ||
861 | ret = fprintf(fp, "#! /bin/sh\n" | |
60a77c18 CB |
862 | "mount -n -t tmpfs -o mode=0755 none %s/%s\n", |
863 | path, newname); | |
864 | if (ret < 0) | |
865 | goto err_close; | |
866 | ||
867 | if (!arg->keepname) { | |
a8e279fd | 868 | ret = fprintf(fp, "mkdir -p %s/%s/delta0/etc\n" |
60a77c18 CB |
869 | "echo %s > %s/%s/delta0/etc/hostname\n", |
870 | path, newname, newname, path, newname); | |
871 | if (ret < 0) | |
872 | goto err_close; | |
873 | } | |
874 | ||
b44c42e8 | 875 | fclose(fp); |
60a77c18 CB |
876 | return premount; |
877 | ||
878 | err_close: | |
a8e279fd CB |
879 | if (fd > 0) |
880 | close(fd); | |
881 | else | |
882 | fclose(fp); | |
60a77c18 CB |
883 | err_free: |
884 | free(premount); | |
885 | return NULL; | |
886 | } |