]>
Commit | Line | Data |
---|---|---|
cc73685d | 1 | /* SPDX-License-Identifier: GPL-2.0-only */ |
43cea62d | 2 | |
1160ce89 CB |
3 | #include "config.h" |
4 | ||
0cb3e3a6 CB |
5 | #include <errno.h> |
6 | #include <fcntl.h> | |
43cea62d CB |
7 | #include <getopt.h> |
8 | #include <signal.h> | |
0cb3e3a6 | 9 | #include <stdbool.h> |
43cea62d | 10 | #include <stdint.h> |
0cb3e3a6 | 11 | #include <stdio.h> |
43cea62d | 12 | #include <stdlib.h> |
0cb3e3a6 | 13 | #include <string.h> |
0cb3e3a6 CB |
14 | #include <sys/stat.h> |
15 | #include <sys/types.h> | |
16 | #include <sys/wait.h> | |
d38dd64a CB |
17 | #include <time.h> |
18 | #include <unistd.h> | |
43cea62d | 19 | |
12ae2a33 | 20 | #include "lxc.h" |
43cea62d | 21 | |
43cea62d | 22 | #include "arguments.h" |
e9b0c679 | 23 | #include "log.h" |
2b670dfe | 24 | #include "storage_utils.h" |
e9b0c679 | 25 | #include "utils.h" |
43cea62d | 26 | |
9dbcd668 | 27 | #ifndef HAVE_GETSUBOPT |
402f6adb | 28 | #include "include/getsubopt.h" |
9dbcd668 SG |
29 | #endif |
30 | ||
e9b0c679 | 31 | lxc_log_define(lxc_copy, lxc); |
32 | ||
43cea62d CB |
33 | enum mnttype { |
34 | LXC_MNT_BIND, | |
43cea62d CB |
35 | LXC_MNT_OVL, |
36 | }; | |
37 | ||
38 | struct mnts { | |
8130ebe8 | 39 | enum mnttype mnt_type; |
43cea62d CB |
40 | char *src; |
41 | char *dest; | |
42 | char *options; | |
43 | char *upper; | |
44 | char *workdir; | |
45 | char *lower; | |
46 | }; | |
47 | ||
8130ebe8 CB |
48 | static unsigned int mnt_table_size = 0; |
49 | static struct mnts *mnt_table = NULL; | |
43cea62d CB |
50 | |
51 | static int my_parser(struct lxc_arguments *args, int c, char *arg); | |
52 | ||
53 | static const struct option my_longopts[] = { | |
54 | { "newname", required_argument, 0, 'N'}, | |
55 | { "newpath", required_argument, 0, 'p'}, | |
56 | { "rename", no_argument, 0, 'R'}, | |
57 | { "snapshot", no_argument, 0, 's'}, | |
754076f5 | 58 | { "allowrunning", no_argument, 0, 'a'}, |
43cea62d CB |
59 | { "foreground", no_argument, 0, 'F'}, |
60 | { "daemon", no_argument, 0, 'd'}, | |
61 | { "ephemeral", no_argument, 0, 'e'}, | |
62 | { "mount", required_argument, 0, 'm'}, | |
3b0dcf2c | 63 | { "backingstorage", required_argument, 0, 'B'}, |
43cea62d CB |
64 | { "fssize", required_argument, 0, 'L'}, |
65 | { "keepdata", no_argument, 0, 'D'}, | |
66 | { "keepname", no_argument, 0, 'K'}, | |
67 | { "keepmac", no_argument, 0, 'M'}, | |
60a77c18 | 68 | { "tmpfs", no_argument, 0, 't'}, |
43cea62d CB |
69 | LXC_COMMON_OPTIONS |
70 | }; | |
71 | ||
72 | /* mount keys */ | |
f3c34858 | 73 | static char *const mount_keys[] = { |
43cea62d | 74 | [LXC_MNT_BIND] = "bind", |
43cea62d CB |
75 | [LXC_MNT_OVL] = "overlay", |
76 | NULL | |
77 | }; | |
78 | ||
79 | static struct lxc_arguments my_args = { | |
80 | .progname = "lxc-copy", | |
2b47bac3 | 81 | .help = "\n\ |
a372480c | 82 | --name=NAME [-P lxcpath] -N newname [-p newpath] [-B backingstorage] [-s] [-K] [-M] [-L size [unit]] -- hook options\n\ |
12e6ab5d | 83 | --name=NAME [-P lxcpath] [-N newname] [-p newpath] [-B backingstorage] -e [-d] [-D] [-K] [-M] [-m {bind,overlay}=/src:/dest] -- hook options\n\ |
43cea62d CB |
84 | --name=NAME [-P lxcpath] -N newname -R\n\ |
85 | \n\ | |
86 | lxc-copy clone a container\n\ | |
87 | \n\ | |
88 | Options :\n\ | |
89 | -n, --name=NAME NAME of the container\n\ | |
90 | -N, --newname=NEWNAME NEWNAME for the restored container\n\ | |
91 | -p, --newpath=NEWPATH NEWPATH for the container to be stored\n\ | |
6f94152d WB |
92 | -R, --rename rename container\n\ |
93 | -s, --snapshot create snapshot instead of clone\n\ | |
754076f5 | 94 | -a, --allowrunning allow snapshot creation even if source container is running\n\ |
6f94152d WB |
95 | -F, --foreground start with current tty attached to /dev/console\n\ |
96 | -d, --daemon daemonize the container (default)\n\ | |
97 | -e, --ephemeral start ephemeral container\n\ | |
98 | -m, --mount directory to mount into container, either \n\ | |
12e6ab5d | 99 | {bind,overlay}=/src-path or {bind,overlay}=/src-path:/dst-path\n\ |
43cea62d | 100 | -B, --backingstorage=TYPE backingstorage type for the container\n\ |
6f94152d WB |
101 | -t, --tmpfs place ephemeral container on a tmpfs\n\ |
102 | (WARNING: On reboot all changes made to the container will be lost.)\n\ | |
103 | -L, --fssize size of the new block device for block device containers\n\ | |
fa18aaac | 104 | -D, --keepdata pass together with -e start a persistent snapshot \n\ |
6f94152d WB |
105 | -K, --keepname keep the hostname of the original container\n\ |
106 | -- hook options arguments passed to the hook program\n\ | |
107 | -M, --keepmac keep the MAC address of the original container\n\ | |
108 | --rcfile=FILE Load configuration file FILE\n", | |
43cea62d CB |
109 | .options = my_longopts, |
110 | .parser = my_parser, | |
111 | .task = CLONE, | |
112 | .daemonize = 1, | |
c89f1f75 | 113 | .quiet = false, |
60a77c18 | 114 | .tmpfs = false, |
43cea62d CB |
115 | }; |
116 | ||
117 | static struct mnts *add_mnt(struct mnts **mnts, unsigned int *num, | |
118 | enum mnttype type); | |
8130ebe8 CB |
119 | static int mk_rand_ovl_dirs(struct mnts *mnts, unsigned int num, |
120 | struct lxc_arguments *arg); | |
43cea62d CB |
121 | static char *construct_path(char *path, bool as_prefix); |
122 | static char *set_mnt_entry(struct mnts *m); | |
123 | static int do_clone(struct lxc_container *c, char *newname, char *newpath, | |
124 | int flags, char *bdevtype, uint64_t fssize, enum task task, | |
125 | char **args); | |
126 | static int do_clone_ephemeral(struct lxc_container *c, | |
8130ebe8 | 127 | struct lxc_arguments *arg, char **args, |
43cea62d CB |
128 | int flags); |
129 | static int do_clone_rename(struct lxc_container *c, char *newname); | |
130 | static int do_clone_task(struct lxc_container *c, enum task task, int flags, | |
131 | char **args); | |
534dfdeb | 132 | static void free_mnts(void); |
60a77c18 CB |
133 | |
134 | /* Place an ephemeral container started with -e flag on a tmpfs. Restrictions | |
135 | * are that you cannot request the data to be kept while placing the container | |
12e6ab5d | 136 | * on a tmpfs and that either overlay storage driver must be used. |
60a77c18 CB |
137 | */ |
138 | static char *mount_tmpfs(const char *oldname, const char *newname, | |
139 | const char *path, struct lxc_arguments *arg); | |
43cea62d CB |
140 | static int parse_mntsubopts(char *subopts, char *const *keys, |
141 | char *mntparameters); | |
43cea62d CB |
142 | static int parse_bind_mnt(char *mntstring, enum mnttype type); |
143 | static int parse_ovl_mnt(char *mntstring, enum mnttype type); | |
144 | ||
145 | int main(int argc, char *argv[]) | |
146 | { | |
147 | struct lxc_container *c; | |
73b910a3 | 148 | struct lxc_log log; |
43cea62d | 149 | int flags = 0; |
534dfdeb | 150 | int ret = EXIT_FAILURE; |
43cea62d CB |
151 | |
152 | if (lxc_arguments_parse(&my_args, argc, argv)) | |
534dfdeb | 153 | exit(ret); |
43cea62d | 154 | |
f6d79ec1 CB |
155 | /* Only create log if explicitly instructed */ |
156 | if (my_args.log_file || my_args.log_priority) { | |
157 | log.name = my_args.name; | |
158 | log.file = my_args.log_file; | |
159 | log.level = my_args.log_priority; | |
160 | log.prefix = my_args.progname; | |
161 | log.quiet = my_args.quiet; | |
162 | log.lxcpath = my_args.lxcpath[0]; | |
163 | ||
164 | if (lxc_log_init(&log)) | |
165 | exit(ret); | |
166 | } | |
43cea62d CB |
167 | |
168 | if (geteuid()) { | |
37180208 | 169 | if (access(my_args.lxcpath[0], O_RDONLY) < 0) { |
e9b0c679 | 170 | ERROR("You lack access to %s", my_args.lxcpath[0]); |
534dfdeb | 171 | exit(ret); |
43cea62d CB |
172 | } |
173 | } | |
174 | ||
175 | if (!my_args.newname && !(my_args.task == DESTROY)) { | |
5dec9c3e | 176 | ERROR("You must provide a NEWNAME for the clone"); |
534dfdeb | 177 | exit(ret); |
43cea62d CB |
178 | } |
179 | ||
180 | if (my_args.task == SNAP || my_args.task == DESTROY) | |
181 | flags |= LXC_CLONE_SNAPSHOT; | |
754076f5 BH |
182 | if (my_args.allowrunning) |
183 | flags |= LXC_CLONE_ALLOW_RUNNING; | |
43cea62d CB |
184 | if (my_args.keepname) |
185 | flags |= LXC_CLONE_KEEPNAME; | |
e9b0c679 | 186 | |
43cea62d CB |
187 | if (my_args.keepmac) |
188 | flags |= LXC_CLONE_KEEPMACADDR; | |
189 | ||
190 | if (!my_args.newpath) | |
191 | my_args.newpath = (char *)my_args.lxcpath[0]; | |
192 | ||
193 | c = lxc_container_new(my_args.name, my_args.lxcpath[0]); | |
194 | if (!c) | |
534dfdeb | 195 | exit(ret); |
43cea62d | 196 | |
50b737a3 WB |
197 | if (my_args.rcfile) { |
198 | c->clear_config(c); | |
e9b0c679 | 199 | |
50b737a3 | 200 | if (!c->load_config(c, my_args.rcfile)) { |
e9b0c679 | 201 | ERROR("Failed to load rcfile"); |
50b737a3 WB |
202 | goto out; |
203 | } | |
e9b0c679 | 204 | |
6118210e WB |
205 | c->configfile = strdup(my_args.rcfile); |
206 | if (!c->configfile) { | |
e9b0c679 | 207 | ERROR("Out of memory setting new config filename"); |
6118210e WB |
208 | goto out; |
209 | } | |
50b737a3 WB |
210 | } |
211 | ||
43cea62d | 212 | if (!c->may_control(c)) { |
e9b0c679 | 213 | ERROR("Insufficent privileges to control %s", c->name); |
534dfdeb | 214 | goto out; |
43cea62d CB |
215 | } |
216 | ||
217 | if (!c->is_defined(c)) { | |
e9b0c679 | 218 | ERROR("Container %s is not defined", c->name); |
534dfdeb | 219 | goto out; |
43cea62d CB |
220 | } |
221 | ||
222 | ret = do_clone_task(c, my_args.task, flags, &argv[optind]); | |
223 | ||
534dfdeb | 224 | out: |
43cea62d CB |
225 | lxc_container_put(c); |
226 | ||
227 | if (ret == 0) | |
228 | exit(EXIT_SUCCESS); | |
229 | exit(EXIT_FAILURE); | |
230 | } | |
231 | ||
232 | static struct mnts *add_mnt(struct mnts **mnts, unsigned int *num, enum mnttype type) | |
233 | { | |
234 | struct mnts *m, *n; | |
235 | ||
236 | n = realloc(*mnts, (*num + 1) * sizeof(struct mnts)); | |
237 | if (!n) | |
238 | return NULL; | |
239 | ||
240 | *mnts = n; | |
241 | m = *mnts + *num; | |
242 | (*num)++; | |
243 | ||
8130ebe8 | 244 | *m = (struct mnts) {.mnt_type = type}; |
43cea62d CB |
245 | |
246 | return m; | |
247 | } | |
248 | ||
8130ebe8 | 249 | static int mk_rand_ovl_dirs(struct mnts *mnts, unsigned int num, struct lxc_arguments *arg) |
43cea62d | 250 | { |
3a5996ff CB |
251 | char upperdir[PATH_MAX]; |
252 | char workdir[PATH_MAX]; | |
43cea62d | 253 | unsigned int i; |
534dfdeb CB |
254 | int ret; |
255 | struct mnts *m = NULL; | |
43cea62d | 256 | |
534dfdeb | 257 | for (i = 0, m = mnts; i < num; i++, m++) { |
12e6ab5d | 258 | if (m->mnt_type == LXC_MNT_OVL) { |
3a5996ff | 259 | ret = snprintf(upperdir, PATH_MAX, "%s/%s/delta#XXXXXX", |
8130ebe8 | 260 | arg->newpath, arg->newname); |
3a5996ff | 261 | if (ret < 0 || ret >= PATH_MAX) |
534dfdeb | 262 | return -1; |
e9b0c679 | 263 | |
43cea62d | 264 | if (!mkdtemp(upperdir)) |
534dfdeb | 265 | return -1; |
e9b0c679 | 266 | |
43cea62d CB |
267 | m->upper = strdup(upperdir); |
268 | if (!m->upper) | |
534dfdeb | 269 | return -1; |
43cea62d CB |
270 | } |
271 | ||
8130ebe8 | 272 | if (m->mnt_type == LXC_MNT_OVL) { |
3a5996ff | 273 | ret = snprintf(workdir, PATH_MAX, "%s/%s/work#XXXXXX", |
8130ebe8 | 274 | arg->newpath, arg->newname); |
3a5996ff | 275 | if (ret < 0 || ret >= PATH_MAX) |
534dfdeb | 276 | return -1; |
e9b0c679 | 277 | |
43cea62d | 278 | if (!mkdtemp(workdir)) |
534dfdeb | 279 | return -1; |
e9b0c679 | 280 | |
43cea62d CB |
281 | m->workdir = strdup(workdir); |
282 | if (!m->workdir) | |
534dfdeb | 283 | return -1; |
43cea62d CB |
284 | } |
285 | } | |
286 | ||
287 | return 0; | |
43cea62d CB |
288 | } |
289 | ||
5fba37a1 CB |
290 | static char **lxc_normalize_path(const char *path) |
291 | { | |
292 | char **components; | |
293 | size_t components_len = 0; | |
294 | size_t pos = 0; | |
295 | ||
296 | components = lxc_string_split(path, '/'); | |
297 | if (!components) | |
298 | return NULL; | |
299 | ||
300 | /* resolve '.' and '..' */ | |
301 | for (pos = 0; pos < components_len;) { | |
302 | if (strequal(components[pos], ".") || | |
303 | (strequal(components[pos], "..") && pos == 0)) { | |
304 | /* eat this element */ | |
305 | free(components[pos]); | |
306 | memmove(&components[pos], &components[pos + 1], | |
307 | sizeof(char *) * (components_len - pos)); | |
308 | components_len--; | |
309 | } else if (strequal(components[pos], "..")) { | |
310 | /* eat this and the previous element */ | |
311 | free(components[pos - 1]); | |
312 | free(components[pos]); | |
313 | memmove(&components[pos - 1], &components[pos + 1], | |
314 | sizeof(char *) * (components_len - pos)); | |
315 | components_len -= 2; | |
316 | pos--; | |
317 | } else { | |
318 | pos++; | |
319 | } | |
320 | } | |
321 | ||
322 | return components; | |
323 | } | |
324 | ||
43cea62d CB |
325 | static char *construct_path(char *path, bool as_prefix) |
326 | { | |
327 | char **components = NULL; | |
328 | char *cleanpath = NULL; | |
329 | ||
330 | components = lxc_normalize_path(path); | |
331 | if (!components) | |
332 | return NULL; | |
333 | ||
334 | cleanpath = lxc_string_join("/", (const char **)components, as_prefix); | |
335 | lxc_free_array((void **)components, free); | |
336 | ||
337 | return cleanpath; | |
338 | } | |
339 | ||
340 | static char *set_mnt_entry(struct mnts *m) | |
341 | { | |
342 | char *mntentry = NULL; | |
343 | int ret = 0; | |
344 | size_t len = 0; | |
345 | ||
12e6ab5d | 346 | if (m->mnt_type == LXC_MNT_OVL) { |
43cea62d CB |
347 | len = strlen(" overlay lowerdir=,upperdir=,workdir=,create=dir") + |
348 | 2 * strlen(m->src) + strlen(m->dest) + strlen(m->upper) + | |
349 | strlen(m->workdir) + 1; | |
350 | ||
351 | mntentry = malloc(len); | |
352 | if (!mntentry) | |
353 | goto err; | |
354 | ||
355 | ret = snprintf(mntentry, len, "%s %s overlay lowerdir=%s,upperdir=%s,workdir=%s,create=dir", | |
356 | m->src, m->dest, m->src, m->upper, m->workdir); | |
357 | if (ret < 0 || (size_t)ret >= len) | |
358 | goto err; | |
8130ebe8 | 359 | } else if (m->mnt_type == LXC_MNT_BIND) { |
43cea62d CB |
360 | len = strlen(" none bind,optional,, 0 0") + |
361 | strlen(is_dir(m->src) ? "create=dir" : "create=file") + | |
362 | strlen(m->src) + strlen(m->dest) + strlen(m->options) + 1; | |
363 | ||
364 | mntentry = malloc(len); | |
365 | if (!mntentry) | |
366 | goto err; | |
367 | ||
368 | ret = snprintf(mntentry, len, "%s %s none bind,optional,%s,%s 0 0", | |
369 | m->src, m->dest, m->options, | |
370 | is_dir(m->src) ? "create=dir" : "create=file"); | |
371 | if (ret < 0 || (size_t)ret >= len) | |
372 | goto err; | |
373 | } | |
374 | ||
375 | return mntentry; | |
376 | ||
377 | err: | |
43cea62d CB |
378 | free(mntentry); |
379 | return NULL; | |
380 | } | |
381 | ||
382 | static int do_clone(struct lxc_container *c, char *newname, char *newpath, | |
383 | int flags, char *bdevtype, uint64_t fssize, enum task task, | |
384 | char **args) | |
385 | { | |
386 | struct lxc_container *clone; | |
387 | ||
388 | clone = c->clone(c, newname, newpath, flags, bdevtype, NULL, fssize, | |
389 | args); | |
390 | if (!clone) { | |
e9b0c679 | 391 | ERROR("Failed to clone"); |
43cea62d CB |
392 | return -1; |
393 | } | |
394 | ||
43cea62d CB |
395 | lxc_container_put(clone); |
396 | ||
397 | return 0; | |
398 | } | |
399 | ||
400 | static int do_clone_ephemeral(struct lxc_container *c, | |
534dfdeb | 401 | struct lxc_arguments *arg, char **args, int flags) |
43cea62d | 402 | { |
60a77c18 | 403 | char *premount; |
3a5996ff | 404 | char randname[PATH_MAX]; |
43cea62d CB |
405 | unsigned int i; |
406 | int ret = 0; | |
534dfdeb | 407 | bool bret = true, started = false; |
0cb3e3a6 | 408 | char *tmp_buf = randname; |
43cea62d | 409 | struct lxc_container *clone; |
43cea62d CB |
410 | lxc_attach_options_t attach_options = LXC_ATTACH_OPTIONS_DEFAULT; |
411 | attach_options.env_policy = LXC_ATTACH_CLEAR_ENV; | |
412 | ||
8130ebe8 | 413 | if (!arg->newname) { |
3a5996ff CB |
414 | ret = snprintf(randname, PATH_MAX, "%s/%s_XXXXXX", arg->newpath, arg->name); |
415 | if (ret < 0 || ret >= PATH_MAX) | |
43cea62d | 416 | return -1; |
e9b0c679 | 417 | |
43cea62d CB |
418 | if (!mkdtemp(randname)) |
419 | return -1; | |
e9b0c679 | 420 | |
534dfdeb | 421 | if (chmod(randname, 0770) < 0) { |
fd41e9b7 | 422 | (void)remove(randname); |
b84e8c4b | 423 | return -1; |
534dfdeb | 424 | } |
e9b0c679 | 425 | |
8130ebe8 | 426 | arg->newname = randname + strlen(arg->newpath) + 1; |
43cea62d CB |
427 | } |
428 | ||
8130ebe8 CB |
429 | clone = c->clone(c, arg->newname, arg->newpath, flags, |
430 | arg->bdevtype, NULL, arg->fssize, args); | |
43cea62d | 431 | if (!clone) |
dca0532e | 432 | return -1; |
43cea62d | 433 | |
60a77c18 | 434 | if (arg->tmpfs) { |
60a77c18 CB |
435 | premount = mount_tmpfs(arg->name, arg->newname, arg->newpath, arg); |
436 | if (!premount) | |
437 | goto destroy_and_put; | |
438 | ||
439 | bret = clone->set_config_item(clone, "lxc.hook.pre-mount", premount); | |
440 | free(premount); | |
441 | if (!bret) | |
442 | goto destroy_and_put; | |
443 | } | |
444 | ||
8130ebe8 | 445 | if (!arg->keepdata) |
43cea62d | 446 | if (!clone->set_config_item(clone, "lxc.ephemeral", "1")) |
534dfdeb | 447 | goto destroy_and_put; |
43cea62d CB |
448 | |
449 | /* allocate and create random upper- and workdirs for overlay mounts */ | |
8130ebe8 | 450 | if (mk_rand_ovl_dirs(mnt_table, mnt_table_size, arg) < 0) |
534dfdeb | 451 | goto destroy_and_put; |
43cea62d CB |
452 | |
453 | /* allocate and set mount entries */ | |
534dfdeb CB |
454 | struct mnts *n = NULL; |
455 | for (i = 0, n = mnt_table; i < mnt_table_size; i++, n++) { | |
43cea62d | 456 | char *mntentry = NULL; |
e9b0c679 | 457 | |
534dfdeb CB |
458 | mntentry = set_mnt_entry(n); |
459 | if (!mntentry) | |
460 | goto destroy_and_put; | |
e9b0c679 | 461 | |
534dfdeb CB |
462 | bret = clone->set_config_item(clone, "lxc.mount.entry", mntentry); |
463 | free(mntentry); | |
464 | if (!bret) | |
465 | goto destroy_and_put; | |
43cea62d CB |
466 | } |
467 | ||
468 | if (!clone->save_config(clone, NULL)) | |
534dfdeb | 469 | goto destroy_and_put; |
43cea62d | 470 | |
c89f1f75 | 471 | if (!my_args.quiet) |
5a8929b1 | 472 | printf("Created %s as clone of %s\n", arg->newname, arg->name); |
43cea62d | 473 | |
60a77c18 CB |
474 | if (arg->tmpfs && !my_args.quiet) |
475 | printf("Container is placed on tmpfs.\nRebooting will cause " | |
b44c42e8 | 476 | "all changes made to it to be lost!\n"); |
60a77c18 | 477 | |
8130ebe8 | 478 | if (!arg->daemonize && arg->argc) { |
43cea62d | 479 | clone->want_daemonize(clone, true); |
8130ebe8 CB |
480 | arg->daemonize = 1; |
481 | } else if (!arg->daemonize) { | |
43cea62d CB |
482 | clone->want_daemonize(clone, false); |
483 | } | |
484 | ||
534dfdeb CB |
485 | started = clone->start(clone, 0, NULL); |
486 | if (!started) | |
487 | goto destroy_and_put; | |
43cea62d | 488 | |
8130ebe8 CB |
489 | if (arg->daemonize && arg->argc) { |
490 | ret = clone->attach_run_wait(clone, &attach_options, arg->argv[0], (const char *const *)arg->argv); | |
43cea62d | 491 | if (ret < 0) |
534dfdeb CB |
492 | goto destroy_and_put; |
493 | clone->shutdown(clone, -1); | |
43cea62d CB |
494 | } |
495 | ||
534dfdeb | 496 | free_mnts(); |
43cea62d CB |
497 | lxc_container_put(clone); |
498 | return 0; | |
499 | ||
534dfdeb CB |
500 | destroy_and_put: |
501 | if (started) | |
502 | clone->shutdown(clone, -1); | |
e9b0c679 | 503 | |
3a5996ff | 504 | ret = clone->get_config_item(clone, "lxc.ephemeral", tmp_buf, PATH_MAX); |
0cb3e3a6 | 505 | if (ret > 0 && strcmp(tmp_buf, "0")) |
534dfdeb | 506 | clone->destroy(clone); |
e9b0c679 | 507 | |
534dfdeb | 508 | free_mnts(); |
43cea62d CB |
509 | lxc_container_put(clone); |
510 | return -1; | |
511 | } | |
512 | ||
513 | static int do_clone_rename(struct lxc_container *c, char *newname) | |
514 | { | |
515 | if (!c->rename(c, newname)) { | |
e9b0c679 | 516 | ERROR("Renaming container %s to %s failed", c->name, newname); |
43cea62d CB |
517 | return -1; |
518 | } | |
519 | ||
43cea62d CB |
520 | return 0; |
521 | } | |
522 | ||
523 | static int do_clone_task(struct lxc_container *c, enum task task, int flags, | |
524 | char **args) | |
525 | { | |
526 | int ret = 0; | |
527 | ||
528 | switch (task) { | |
529 | case DESTROY: | |
530 | ret = do_clone_ephemeral(c, &my_args, args, flags); | |
531 | break; | |
532 | case RENAME: | |
533 | ret = do_clone_rename(c, my_args.newname); | |
534 | break; | |
535 | default: | |
536 | ret = do_clone(c, my_args.newname, my_args.newpath, flags, | |
537 | my_args.bdevtype, my_args.fssize, my_args.task, | |
538 | args); | |
539 | break; | |
540 | } | |
541 | ||
542 | return ret; | |
543 | } | |
544 | ||
39b72573 | 545 | static void free_mnts(void) |
43cea62d CB |
546 | { |
547 | unsigned int i; | |
534dfdeb | 548 | struct mnts *n = NULL; |
43cea62d | 549 | |
534dfdeb | 550 | for (i = 0, n = mnt_table; i < mnt_table_size; i++, n++) { |
43cea62d CB |
551 | free(n->src); |
552 | free(n->dest); | |
553 | free(n->options); | |
554 | free(n->upper); | |
555 | free(n->workdir); | |
556 | } | |
e9b0c679 | 557 | |
534dfdeb CB |
558 | free(mnt_table); |
559 | mnt_table = NULL; | |
560 | mnt_table_size = 0; | |
43cea62d CB |
561 | } |
562 | ||
43cea62d CB |
563 | static int my_parser(struct lxc_arguments *args, int c, char *arg) |
564 | { | |
565 | char *subopts = NULL; | |
566 | char *mntparameters = NULL; | |
567 | switch (c) { | |
568 | case 'N': | |
569 | args->newname = arg; | |
570 | break; | |
571 | case 'p': | |
572 | args->newpath = arg; | |
573 | break; | |
574 | case 'R': | |
575 | args->task = RENAME; | |
576 | break; | |
577 | case 's': | |
578 | args->task = SNAP; | |
579 | break; | |
754076f5 BH |
580 | case 'a': |
581 | args->allowrunning = 1; | |
582 | break; | |
43cea62d CB |
583 | case 'F': |
584 | args->daemonize = 0; | |
585 | break; | |
586 | case 'd': | |
587 | args->daemonize = 1; | |
588 | break; | |
589 | case 'e': | |
590 | args->task = DESTROY; | |
591 | break; | |
592 | case 'm': | |
593 | subopts = optarg; | |
f3c34858 | 594 | if (parse_mntsubopts(subopts, mount_keys, mntparameters) < 0) |
43cea62d CB |
595 | return -1; |
596 | break; | |
597 | case 'B': | |
5dec9c3e | 598 | if (strncmp(arg, "overlay", strlen(arg)) == 0) |
adc9b249 | 599 | arg = "overlayfs"; |
43cea62d CB |
600 | args->bdevtype = arg; |
601 | break; | |
60a77c18 CB |
602 | case 't': |
603 | args->tmpfs = true; | |
604 | break; | |
43cea62d CB |
605 | case 'L': |
606 | args->fssize = get_fssize(optarg); | |
607 | break; | |
608 | case 'D': | |
609 | args->keepdata = 1; | |
610 | break; | |
611 | case 'K': | |
612 | args->keepname = 1; | |
613 | break; | |
614 | case 'M': | |
615 | args->keepmac = 1; | |
616 | break; | |
617 | } | |
618 | ||
619 | return 0; | |
620 | } | |
621 | ||
43cea62d CB |
622 | static int parse_bind_mnt(char *mntstring, enum mnttype type) |
623 | { | |
624 | int len = 0; | |
625 | char **mntarray = NULL; | |
626 | struct mnts *m = NULL; | |
627 | ||
8130ebe8 | 628 | m = add_mnt(&mnt_table, &mnt_table_size, type); |
43cea62d CB |
629 | if (!m) |
630 | goto err; | |
631 | ||
632 | mntarray = lxc_string_split(mntstring, ':'); | |
633 | if (!mntarray) | |
634 | goto err; | |
635 | ||
636 | m->src = construct_path(mntarray[0], true); | |
637 | if (!m->src) | |
638 | goto err; | |
639 | ||
640 | len = lxc_array_len((void **)mntarray); | |
641 | if (len == 1) { /* bind=src */ | |
642 | m->dest = construct_path(mntarray[0], false); | |
643 | } else if (len == 2) { /* bind=src:option or bind=src:dest */ | |
5dec9c3e | 644 | if (strncmp(mntarray[1], "rw", strlen(mntarray[1])) == 0) |
43cea62d CB |
645 | m->options = strdup("rw"); |
646 | ||
5dec9c3e | 647 | if (strncmp(mntarray[1], "ro", strlen(mntarray[1])) == 0) |
43cea62d CB |
648 | m->options = strdup("ro"); |
649 | ||
650 | if (m->options) | |
651 | m->dest = construct_path(mntarray[0], false); | |
652 | else | |
653 | m->dest = construct_path(mntarray[1], false); | |
654 | } else if (len == 3) { /* bind=src:dest:option */ | |
655 | m->dest = construct_path(mntarray[1], false); | |
656 | m->options = strdup(mntarray[2]); | |
657 | } else { | |
4a296c63 | 658 | printf("Excess elements in mount specification\n"); |
43cea62d CB |
659 | } |
660 | ||
661 | if (!m->dest) | |
662 | goto err; | |
663 | ||
664 | if (!m->options) | |
665 | m->options = strdup("rw"); | |
666 | ||
5dec9c3e | 667 | if (!m->options || (strncmp(m->options, "rw", strlen(m->options)) != 0 && |
668 | strncmp(m->options, "ro", strlen(m->options)) != 0)) | |
43cea62d CB |
669 | goto err; |
670 | ||
671 | lxc_free_array((void **)mntarray, free); | |
672 | return 0; | |
673 | ||
674 | err: | |
534dfdeb | 675 | free_mnts(); |
43cea62d CB |
676 | lxc_free_array((void **)mntarray, free); |
677 | return -1; | |
678 | } | |
679 | ||
680 | static int parse_mntsubopts(char *subopts, char *const *keys, char *mntparameters) | |
681 | { | |
682 | while (*subopts != '\0') { | |
683 | switch (getsubopt(&subopts, keys, &mntparameters)) { | |
684 | case LXC_MNT_BIND: | |
685 | if (parse_bind_mnt(mntparameters, LXC_MNT_BIND) < 0) | |
686 | return -1; | |
687 | break; | |
688 | case LXC_MNT_OVL: | |
689 | if (parse_ovl_mnt(mntparameters, LXC_MNT_OVL) < 0) | |
690 | return -1; | |
691 | break; | |
43cea62d CB |
692 | default: |
693 | break; | |
694 | } | |
695 | } | |
e9b0c679 | 696 | |
43cea62d CB |
697 | return 0; |
698 | } | |
699 | ||
700 | static int parse_ovl_mnt(char *mntstring, enum mnttype type) | |
701 | { | |
702 | int len = 0; | |
703 | char **mntarray = NULL; | |
704 | struct mnts *m; | |
705 | ||
8130ebe8 | 706 | m = add_mnt(&mnt_table, &mnt_table_size, type); |
43cea62d CB |
707 | if (!m) |
708 | goto err; | |
709 | ||
710 | mntarray = lxc_string_split(mntstring, ':'); | |
711 | if (!mntarray) | |
712 | goto err; | |
713 | ||
714 | m->src = construct_path(mntarray[0], true); | |
715 | if (!m->src) | |
716 | goto err; | |
717 | ||
718 | len = lxc_array_len((void **)mntarray); | |
719 | if (len == 1) /* overlay=src */ | |
720 | m->dest = construct_path(mntarray[0], false); | |
721 | else if (len == 2) /* overlay=src:dest */ | |
722 | m->dest = construct_path(mntarray[1], false); | |
723 | else | |
4a296c63 | 724 | printf("Excess elements in mount specification\n"); |
43cea62d CB |
725 | |
726 | if (!m->dest) | |
727 | goto err; | |
728 | ||
729 | lxc_free_array((void **)mntarray, free); | |
730 | return 0; | |
731 | ||
732 | err: | |
534dfdeb | 733 | free_mnts(); |
43cea62d CB |
734 | lxc_free_array((void **)mntarray, free); |
735 | return -1; | |
736 | } | |
60a77c18 | 737 | |
12e6ab5d | 738 | /* For ephemeral snapshots backed by the overlay filesystem, this function |
60a77c18 CB |
739 | * mounts a fresh tmpfs over the containers directory if the user requests it. |
740 | * Because we mount a fresh tmpfs over the directory of the container the | |
741 | * updated /etc/hostname file created during the clone residing in the upperdir | |
742 | * (currently named "delta0" by default) will be hidden. Hence, if the user | |
743 | * requests that the old name is not to be kept for the clone, we recreate this | |
744 | * file on the tmpfs. This should be all that is required to restore the exact | |
745 | * behaviour we would get with a normal clone. | |
746 | */ | |
747 | static char *mount_tmpfs(const char *oldname, const char *newname, | |
748 | const char *path, struct lxc_arguments *arg) | |
749 | { | |
750 | int ret, fd; | |
751 | size_t len; | |
ea753960 | 752 | mode_t msk; |
60a77c18 | 753 | char *premount = NULL; |
9104c79a | 754 | FILE *fp = NULL; |
60a77c18 CB |
755 | |
756 | if (arg->tmpfs && arg->keepdata) { | |
e9b0c679 | 757 | ERROR("%s", |
758 | "A container can only be placed on a tmpfs when the " | |
759 | "overlay storage driver is used"); | |
60a77c18 CB |
760 | goto err_free; |
761 | } | |
762 | ||
763 | if (arg->tmpfs && !arg->bdevtype) { | |
764 | arg->bdevtype = "overlayfs"; | |
12e6ab5d | 765 | } else if (arg->tmpfs && arg->bdevtype && |
5dec9c3e | 766 | strncmp(arg->bdevtype, "overlayfs", strlen(arg->bdevtype)) != 0) { |
e9b0c679 | 767 | ERROR("%s", |
768 | "A container can only be placed on a tmpfs when the " | |
769 | "overlay storage driver is used"); | |
60a77c18 CB |
770 | goto err_free; |
771 | } | |
772 | ||
773 | len = strlen(path) + strlen(newname) + strlen("pre-start-XXXXXX") + /* //\0 */ 3; | |
774 | premount = malloc(len); | |
775 | if (!premount) | |
776 | goto err_free; | |
777 | ||
778 | ret = snprintf(premount, len, "%s/%s/pre-start-XXXXXX", path, newname); | |
779 | if (ret < 0 || (size_t)ret >= len) | |
780 | goto err_free; | |
781 | ||
ea753960 | 782 | msk = umask(0022); |
a8e279fd | 783 | fd = mkstemp(premount); |
ea753960 | 784 | umask(msk); |
60a77c18 CB |
785 | if (fd < 0) |
786 | goto err_free; | |
787 | ||
a8e279fd | 788 | if (fcntl(fd, F_SETFD, FD_CLOEXEC)) { |
5dec9c3e | 789 | ERROR("Failed to set close-on-exec on file descriptor"); |
a8e279fd CB |
790 | goto err_close; |
791 | } | |
792 | ||
60a77c18 CB |
793 | if (chmod(premount, 0755) < 0) |
794 | goto err_close; | |
795 | ||
a8e279fd CB |
796 | fp = fdopen(fd, "r+"); |
797 | if (!fp) | |
798 | goto err_close; | |
799 | fd = -1; | |
800 | ||
801 | ret = fprintf(fp, "#! /bin/sh\n" | |
27d79d0a | 802 | "mount -n -t tmpfs -o mode=0755 none %s/%s/overlay\n", |
60a77c18 CB |
803 | path, newname); |
804 | if (ret < 0) | |
805 | goto err_close; | |
806 | ||
807 | if (!arg->keepname) { | |
facdf925 CB |
808 | ret = fprintf(fp, |
809 | "mkdir -p %s/%s/%s/etc\n" | |
810 | "echo %s > %s/%s/%s/etc/hostname\n", | |
811 | path, newname, LXC_OVERLAY_DELTA_PATH, newname, | |
812 | path, newname, LXC_OVERLAY_DELTA_PATH); | |
60a77c18 CB |
813 | if (ret < 0) |
814 | goto err_close; | |
815 | } | |
816 | ||
b44c42e8 | 817 | fclose(fp); |
60a77c18 CB |
818 | return premount; |
819 | ||
820 | err_close: | |
a8e279fd CB |
821 | if (fd > 0) |
822 | close(fd); | |
9104c79a | 823 | else if (fp) |
a8e279fd | 824 | fclose(fp); |
e9b0c679 | 825 | |
60a77c18 CB |
826 | err_free: |
827 | free(premount); | |
828 | return NULL; | |
829 | } |