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Commit | Line | Data |
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e29fe1dd TA |
1 | /* |
2 | * lxc: linux Container library | |
3 | * | |
4 | * Copyright © 2014-2015 Canonical Ltd. | |
5 | * | |
6 | * Authors: | |
7 | * Tycho Andersen <tycho.andersen@canonical.com> | |
8 | * | |
9 | * This library is free software; you can redistribute it and/or | |
10 | * modify it under the terms of the GNU Lesser General Public | |
11 | * License as published by the Free Software Foundation; either | |
12 | * version 2.1 of the License, or (at your option) any later version. | |
13 | * | |
14 | * This library is distributed in the hope that it will be useful, | |
15 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
17 | * Lesser General Public License for more details. | |
18 | * | |
19 | * You should have received a copy of the GNU Lesser General Public | |
20 | * License along with this library; if not, write to the Free Software | |
21 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA | |
22 | */ | |
d38dd64a CB |
23 | |
24 | #ifndef _GNU_SOURCE | |
25 | #define _GNU_SOURCE 1 | |
26 | #endif | |
9b945f13 | 27 | #include <inttypes.h> |
e29fe1dd TA |
28 | #include <linux/limits.h> |
29 | #include <sched.h> | |
30 | #include <stdio.h> | |
31 | #include <stdlib.h> | |
32 | #include <string.h> | |
33 | #include <sys/mount.h> | |
34 | #include <sys/types.h> | |
35 | #include <sys/wait.h> | |
36 | #include <unistd.h> | |
37 | ||
e29fe1dd | 38 | #include "cgroup.h" |
dc259399 | 39 | #include "commands.h" |
d38dd64a CB |
40 | #include "conf.h" |
41 | #include "config.h" | |
e29fe1dd TA |
42 | #include "criu.h" |
43 | #include "log.h" | |
44 | #include "lxc.h" | |
45 | #include "lxclock.h" | |
46 | #include "network.h" | |
28d832c4 | 47 | #include "storage.h" |
e8f764b6 | 48 | #include "syscall_wrappers.h" |
e29fe1dd TA |
49 | #include "utils.h" |
50 | ||
5f4e44a2 TA |
51 | #if IS_BIONIC |
52 | #include <../include/lxcmntent.h> | |
53 | #else | |
54 | #include <mntent.h> | |
55 | #endif | |
56 | ||
9de31d5a CB |
57 | #ifndef HAVE_STRLCPY |
58 | #include "include/strlcpy.h" | |
59 | #endif | |
60 | ||
c33b0338 | 61 | #define CRIU_VERSION "2.0" |
73d46752 TA |
62 | |
63 | #define CRIU_GITID_VERSION "2.0" | |
64 | #define CRIU_GITID_PATCHLEVEL 0 | |
65 | ||
f1954503 | 66 | #define CRIU_IN_FLIGHT_SUPPORT "2.4" |
46c8ffd5 | 67 | #define CRIU_EXTERNAL_NOT_VETH "2.8" |
f1954503 | 68 | |
ac2cecc4 | 69 | lxc_log_define(criu, lxc); |
e29fe1dd | 70 | |
73d46752 | 71 | struct criu_opts { |
5af85cb1 TA |
72 | /* the thing to hook to stdout and stderr for logging */ |
73 | int pipefd; | |
74 | ||
73d46752 TA |
75 | /* The type of criu invocation, one of "dump" or "restore" */ |
76 | char *action; | |
77 | ||
b2c3710f TA |
78 | /* the user-provided migrate options relevant to this action */ |
79 | struct migrate_opts *user; | |
73d46752 TA |
80 | |
81 | /* The container to dump */ | |
82 | struct lxc_container *c; | |
83 | ||
73d46752 | 84 | /* dump: stop the container or not after dumping? */ |
4b54788e | 85 | char tty_id[32]; /* the criu tty id for /dev/console, i.e. "tty[${rdev}:${dev}]" */ |
73d46752 TA |
86 | |
87 | /* restore: the file to write the init process' pid into */ | |
0ab5703f | 88 | struct lxc_handler *handler; |
4b54788e TA |
89 | int console_fd; |
90 | /* The path that is bind mounted from /dev/console, if any. We don't | |
91 | * want to use `--ext-mount-map auto`'s result here because the pts | |
92 | * device may have a different path (e.g. if the pty number is | |
3aed4934 | 93 | * different) on the target host. NULL if lxc.console.path = "none". |
4b54788e TA |
94 | */ |
95 | char *console_name; | |
f1954503 AR |
96 | |
97 | /* The detected version of criu */ | |
98 | char *criu_version; | |
73d46752 TA |
99 | }; |
100 | ||
4b54788e TA |
101 | static int load_tty_major_minor(char *directory, char *output, int len) |
102 | { | |
103 | FILE *f; | |
104 | char path[PATH_MAX]; | |
105 | int ret; | |
106 | ||
107 | ret = snprintf(path, sizeof(path), "%s/tty.info", directory); | |
108 | if (ret < 0 || ret >= sizeof(path)) { | |
f510330c | 109 | ERROR("snprintf'd too many characters: %d", ret); |
4b54788e TA |
110 | return -1; |
111 | } | |
112 | ||
113 | f = fopen(path, "r"); | |
114 | if (!f) { | |
115 | /* This means we're coming from a liblxc which didn't export | |
3aed4934 CB |
116 | * the tty info. In this case they had to have lxc.console.path |
117 | * = * none, so there's no problem restoring. | |
4b54788e TA |
118 | */ |
119 | if (errno == ENOENT) | |
120 | return 0; | |
121 | ||
122 | SYSERROR("couldn't open %s", path); | |
123 | return -1; | |
124 | } | |
125 | ||
126 | if (!fgets(output, len, f)) { | |
127 | fclose(f); | |
128 | SYSERROR("couldn't read %s", path); | |
129 | return -1; | |
130 | } | |
131 | ||
132 | fclose(f); | |
133 | return 0; | |
134 | } | |
135 | ||
74ad3607 FB |
136 | static int cmp_version(const char *v1, const char *v2) |
137 | { | |
138 | int ret; | |
139 | int oct_v1[3], oct_v2[3]; | |
140 | ||
141 | memset(oct_v1, -1, sizeof(oct_v1)); | |
142 | memset(oct_v2, -1, sizeof(oct_v2)); | |
143 | ||
144 | ret = sscanf(v1, "%d.%d.%d", &oct_v1[0], &oct_v1[1], &oct_v1[2]); | |
145 | if (ret < 1) | |
146 | return -1; | |
147 | ||
148 | ret = sscanf(v2, "%d.%d.%d", &oct_v2[0], &oct_v2[1], &oct_v2[2]); | |
149 | if (ret < 1) | |
150 | return -1; | |
151 | ||
152 | /* Major version is greater. */ | |
153 | if (oct_v1[0] > oct_v2[0]) | |
154 | return 1; | |
155 | ||
156 | if (oct_v1[0] < oct_v2[0]) | |
157 | return -1; | |
158 | ||
159 | /* Minor number is greater.*/ | |
160 | if (oct_v1[1] > oct_v2[1]) | |
161 | return 1; | |
162 | ||
163 | if (oct_v1[1] < oct_v2[1]) | |
164 | return -1; | |
165 | ||
166 | /* Patch number is greater. */ | |
167 | if (oct_v1[2] > oct_v2[2]) | |
168 | return 1; | |
169 | ||
170 | /* Patch numbers are equal. */ | |
171 | if (oct_v1[2] == oct_v2[2]) | |
172 | return 0; | |
173 | ||
174 | return -1; | |
175 | } | |
176 | ||
e20f46f8 AR |
177 | static void exec_criu(struct cgroup_ops *cgroup_ops, struct lxc_conf *conf, |
178 | struct criu_opts *opts) | |
e29fe1dd TA |
179 | { |
180 | char **argv, log[PATH_MAX]; | |
19d1509c | 181 | int static_args = 23, argc = 0, i, ret; |
e29fe1dd TA |
182 | int netnr = 0; |
183 | struct lxc_list *it; | |
5f4e44a2 TA |
184 | FILE *mnts; |
185 | struct mntent mntent; | |
e29fe1dd | 186 | |
0e4be3cf | 187 | char buf[4096], ttys[32]; |
a17fa3c0 | 188 | size_t pos; |
5af85cb1 | 189 | |
e9195050 TA |
190 | /* If we are currently in a cgroup /foo/bar, and the container is in a |
191 | * cgroup /lxc/foo, lxcfs will give us an ENOENT if some task in the | |
192 | * container has an open fd that points to one of the cgroup files | |
193 | * (systemd always opens its "root" cgroup). So, let's escape to the | |
194 | * /actual/ root cgroup so that lxcfs thinks criu has enough rights to | |
195 | * see all cgroups. | |
196 | */ | |
e20f46f8 | 197 | if (!cgroup_ops->escape(cgroup_ops, conf)) { |
e9195050 TA |
198 | ERROR("failed to escape cgroups"); |
199 | return; | |
200 | } | |
201 | ||
e29fe1dd | 202 | /* The command line always looks like: |
19d1509c | 203 | * criu $(action) --tcp-established --file-locks --link-remap \ |
5f178bc9 | 204 | * --manage-cgroups=full --action-script foo.sh -D $(directory) \ |
e29fe1dd TA |
205 | * -o $(directory)/$(action).log --ext-mount-map auto |
206 | * --enable-external-sharing --enable-external-masters | |
4b54788e | 207 | * --enable-fs hugetlbfs --enable-fs tracefs --ext-mount-map console:/dev/pts/n |
e29fe1dd TA |
208 | * +1 for final NULL */ |
209 | ||
aef3d51e | 210 | if (strcmp(opts->action, "dump") == 0 || strcmp(opts->action, "pre-dump") == 0) { |
dc259399 TA |
211 | /* -t pid --freeze-cgroup /lxc/ct */ |
212 | static_args += 4; | |
e29fe1dd | 213 | |
aef3d51e | 214 | /* --prev-images-dir <path-to-directory-A-relative-to-B> */ |
b2c3710f | 215 | if (opts->user->predump_dir) |
aef3d51e TA |
216 | static_args += 2; |
217 | ||
74eb576c | 218 | /* --page-server --address <address> --port <port> */ |
b2c3710f | 219 | if (opts->user->pageserver_address && opts->user->pageserver_port) |
74eb576c NE |
220 | static_args += 5; |
221 | ||
aef3d51e | 222 | /* --leave-running (only for final dump) */ |
b2c3710f | 223 | if (strcmp(opts->action, "dump") == 0 && !opts->user->stop) |
e29fe1dd | 224 | static_args++; |
4b54788e TA |
225 | |
226 | /* --external tty[88,4] */ | |
227 | if (opts->tty_id[0]) | |
228 | static_args += 2; | |
19d1509c TA |
229 | |
230 | /* --force-irmap */ | |
231 | if (!opts->user->preserves_inodes) | |
232 | static_args++; | |
b2b7b0d2 TA |
233 | |
234 | /* --ghost-limit 1024 */ | |
235 | if (opts->user->ghost_limit) | |
236 | static_args += 2; | |
e29fe1dd TA |
237 | } else if (strcmp(opts->action, "restore") == 0) { |
238 | /* --root $(lxc_mount_point) --restore-detached | |
0ab5703f | 239 | * --restore-sibling |
13389b29 TA |
240 | * --lsm-profile apparmor:whatever |
241 | */ | |
0ab5703f | 242 | static_args += 6; |
4b54788e | 243 | |
0e4be3cf CB |
244 | ttys[0] = 0; |
245 | if (load_tty_major_minor(opts->user->directory, ttys, sizeof(ttys))) | |
4b54788e TA |
246 | return; |
247 | ||
248 | /* --inherit-fd fd[%d]:tty[%s] */ | |
0e4be3cf | 249 | if (ttys[0]) |
4b54788e | 250 | static_args += 2; |
e29fe1dd TA |
251 | } else { |
252 | return; | |
253 | } | |
254 | ||
2202afc9 CB |
255 | if (cgroup_ops->num_hierarchies(cgroup_ops) > 0) |
256 | static_args += 2 * cgroup_ops->num_hierarchies(cgroup_ops); | |
0ab5703f | 257 | |
b2c3710f | 258 | if (opts->user->verbose) |
e29fe1dd TA |
259 | static_args++; |
260 | ||
b9ee6643 TA |
261 | if (opts->user->action_script) |
262 | static_args += 2; | |
263 | ||
5f4e44a2 TA |
264 | static_args += 2 * lxc_list_len(&opts->c->lxc_conf->mount_list); |
265 | ||
b2c3710f | 266 | ret = snprintf(log, PATH_MAX, "%s/%s.log", opts->user->directory, opts->action); |
e29fe1dd | 267 | if (ret < 0 || ret >= PATH_MAX) { |
9f1f54b0 | 268 | ERROR("logfile name too long"); |
e29fe1dd TA |
269 | return; |
270 | } | |
271 | ||
272 | argv = malloc(static_args * sizeof(*argv)); | |
273 | if (!argv) | |
274 | return; | |
275 | ||
276 | memset(argv, 0, static_args * sizeof(*argv)); | |
277 | ||
278 | #define DECLARE_ARG(arg) \ | |
279 | do { \ | |
280 | if (arg == NULL) { \ | |
281 | ERROR("Got NULL argument for criu"); \ | |
282 | goto err; \ | |
283 | } \ | |
284 | argv[argc++] = strdup(arg); \ | |
285 | if (!argv[argc-1]) \ | |
286 | goto err; \ | |
287 | } while (0) | |
288 | ||
289 | argv[argc++] = on_path("criu", NULL); | |
290 | if (!argv[argc-1]) { | |
9f1f54b0 | 291 | ERROR("Couldn't find criu binary"); |
e29fe1dd TA |
292 | goto err; |
293 | } | |
294 | ||
295 | DECLARE_ARG(opts->action); | |
296 | DECLARE_ARG("--tcp-established"); | |
297 | DECLARE_ARG("--file-locks"); | |
298 | DECLARE_ARG("--link-remap"); | |
0a5fc6df | 299 | DECLARE_ARG("--manage-cgroups=full"); |
e29fe1dd TA |
300 | DECLARE_ARG("--ext-mount-map"); |
301 | DECLARE_ARG("auto"); | |
302 | DECLARE_ARG("--enable-external-sharing"); | |
303 | DECLARE_ARG("--enable-external-masters"); | |
dd62857a TA |
304 | DECLARE_ARG("--enable-fs"); |
305 | DECLARE_ARG("hugetlbfs"); | |
5b454329 TA |
306 | DECLARE_ARG("--enable-fs"); |
307 | DECLARE_ARG("tracefs"); | |
e29fe1dd | 308 | DECLARE_ARG("-D"); |
b2c3710f | 309 | DECLARE_ARG(opts->user->directory); |
e29fe1dd TA |
310 | DECLARE_ARG("-o"); |
311 | DECLARE_ARG(log); | |
312 | ||
2202afc9 | 313 | for (i = 0; i < cgroup_ops->num_hierarchies(cgroup_ops); i++) { |
0ab5703f | 314 | char **controllers = NULL, *fullname; |
31b204e4 | 315 | char *path, *tmp; |
0ab5703f | 316 | |
2202afc9 | 317 | if (!cgroup_ops->get_hierarchies(cgroup_ops, i, &controllers)) { |
0ab5703f TA |
318 | ERROR("failed to get hierarchy %d", i); |
319 | goto err; | |
320 | } | |
321 | ||
322 | /* if we are in a dump, we have to ask the monitor process what | |
323 | * the right cgroup is. if this is a restore, we can just use | |
324 | * the handler the restore task created. | |
325 | */ | |
326 | if (!strcmp(opts->action, "dump") || !strcmp(opts->action, "pre-dump")) { | |
327 | path = lxc_cmd_get_cgroup_path(opts->c->name, opts->c->config_path, controllers[0]); | |
328 | if (!path) { | |
329 | ERROR("failed to get cgroup path for %s", controllers[0]); | |
330 | goto err; | |
331 | } | |
332 | } else { | |
333 | const char *p; | |
334 | ||
2202afc9 | 335 | p = cgroup_ops->get_cgroup(cgroup_ops, controllers[0]); |
0ab5703f TA |
336 | if (!p) { |
337 | ERROR("failed to get cgroup path for %s", controllers[0]); | |
338 | goto err; | |
339 | } | |
340 | ||
341 | path = strdup(p); | |
342 | if (!path) { | |
343 | ERROR("strdup failed"); | |
344 | goto err; | |
345 | } | |
346 | } | |
347 | ||
31b204e4 CB |
348 | tmp = lxc_deslashify(path); |
349 | if (!tmp) { | |
350 | ERROR("Failed to remove extraneous slashes from \"%s\"", | |
351 | path); | |
0ab5703f TA |
352 | free(path); |
353 | goto err; | |
354 | } | |
31b204e4 CB |
355 | free(path); |
356 | path = tmp; | |
0ab5703f TA |
357 | |
358 | fullname = lxc_string_join(",", (const char **) controllers, false); | |
359 | if (!fullname) { | |
360 | ERROR("failed to join controllers"); | |
361 | free(path); | |
362 | goto err; | |
363 | } | |
364 | ||
365 | ret = sprintf(buf, "%s:%s", fullname, path); | |
366 | free(path); | |
367 | free(fullname); | |
368 | if (ret < 0 || ret >= sizeof(buf)) { | |
369 | ERROR("sprintf of cgroup root arg failed"); | |
370 | goto err; | |
371 | } | |
372 | ||
373 | DECLARE_ARG("--cgroup-root"); | |
374 | DECLARE_ARG(buf); | |
375 | } | |
376 | ||
b2c3710f | 377 | if (opts->user->verbose) |
582cb478 | 378 | DECLARE_ARG("-v4"); |
e29fe1dd | 379 | |
b9ee6643 TA |
380 | if (opts->user->action_script) { |
381 | DECLARE_ARG("--action-script"); | |
382 | DECLARE_ARG(opts->user->action_script); | |
383 | } | |
384 | ||
1800f924 WB |
385 | mnts = make_anonymous_mount_file(&opts->c->lxc_conf->mount_list, |
386 | opts->c->lxc_conf->lsm_aa_allow_nesting); | |
5f4e44a2 TA |
387 | if (!mnts) |
388 | goto err; | |
389 | ||
390 | while (getmntent_r(mnts, &mntent, buf, sizeof(buf))) { | |
d07545c7 | 391 | char *mntdata; |
5f4e44a2 | 392 | char arg[2 * PATH_MAX + 2]; |
19d2422b TA |
393 | unsigned long flags; |
394 | ||
395 | if (parse_mntopts(mntent.mnt_opts, &flags, &mntdata) < 0) | |
396 | goto err; | |
397 | ||
398 | free(mntdata); | |
399 | ||
400 | /* only add --ext-mount-map for actual bind mounts */ | |
401 | if (!(flags & MS_BIND)) | |
402 | continue; | |
5f4e44a2 | 403 | |
d07545c7 CB |
404 | if (strcmp(opts->action, "dump") == 0) |
405 | ret = snprintf(arg, sizeof(arg), "/%s:%s", | |
406 | mntent.mnt_dir, mntent.mnt_dir); | |
407 | else | |
408 | ret = snprintf(arg, sizeof(arg), "%s:%s", | |
409 | mntent.mnt_dir, mntent.mnt_fsname); | |
5f4e44a2 TA |
410 | if (ret < 0 || ret >= sizeof(arg)) { |
411 | fclose(mnts); | |
412 | ERROR("snprintf failed"); | |
413 | goto err; | |
414 | } | |
415 | ||
416 | DECLARE_ARG("--ext-mount-map"); | |
417 | DECLARE_ARG(arg); | |
418 | } | |
419 | fclose(mnts); | |
420 | ||
aef3d51e | 421 | if (strcmp(opts->action, "dump") == 0 || strcmp(opts->action, "pre-dump") == 0) { |
dc259399 | 422 | char pid[32], *freezer_relative; |
e29fe1dd TA |
423 | |
424 | if (sprintf(pid, "%d", opts->c->init_pid(opts->c)) < 0) | |
425 | goto err; | |
426 | ||
427 | DECLARE_ARG("-t"); | |
428 | DECLARE_ARG(pid); | |
dc259399 TA |
429 | |
430 | freezer_relative = lxc_cmd_get_cgroup_path(opts->c->name, | |
431 | opts->c->config_path, | |
432 | "freezer"); | |
433 | if (!freezer_relative) { | |
434 | ERROR("failed getting freezer path"); | |
435 | goto err; | |
436 | } | |
437 | ||
438 | ret = snprintf(log, sizeof(log), "/sys/fs/cgroup/freezer/%s", freezer_relative); | |
439 | if (ret < 0 || ret >= sizeof(log)) | |
440 | goto err; | |
441 | ||
f1954503 AR |
442 | if (!opts->user->disable_skip_in_flight && |
443 | strcmp(opts->criu_version, CRIU_IN_FLIGHT_SUPPORT) >= 0) | |
444 | DECLARE_ARG("--skip-in-flight"); | |
445 | ||
dc259399 TA |
446 | DECLARE_ARG("--freeze-cgroup"); |
447 | DECLARE_ARG(log); | |
448 | ||
4b54788e | 449 | if (opts->tty_id[0]) { |
36d2096c TA |
450 | DECLARE_ARG("--ext-mount-map"); |
451 | DECLARE_ARG("/dev/console:console"); | |
452 | ||
4b54788e TA |
453 | DECLARE_ARG("--external"); |
454 | DECLARE_ARG(opts->tty_id); | |
455 | } | |
456 | ||
b2c3710f | 457 | if (opts->user->predump_dir) { |
aef3d51e | 458 | DECLARE_ARG("--prev-images-dir"); |
b2c3710f | 459 | DECLARE_ARG(opts->user->predump_dir); |
9f99a33f | 460 | DECLARE_ARG("--track-mem"); |
74eb576c | 461 | } |
4c0c0319 | 462 | |
b2c3710f | 463 | if (opts->user->pageserver_address && opts->user->pageserver_port) { |
74eb576c NE |
464 | DECLARE_ARG("--page-server"); |
465 | DECLARE_ARG("--address"); | |
b2c3710f | 466 | DECLARE_ARG(opts->user->pageserver_address); |
74eb576c | 467 | DECLARE_ARG("--port"); |
b2c3710f | 468 | DECLARE_ARG(opts->user->pageserver_port); |
74eb576c | 469 | } |
aef3d51e | 470 | |
19d1509c TA |
471 | if (!opts->user->preserves_inodes) |
472 | DECLARE_ARG("--force-irmap"); | |
473 | ||
b2b7b0d2 TA |
474 | if (opts->user->ghost_limit) { |
475 | char ghost_limit[32]; | |
476 | ||
9b945f13 | 477 | ret = sprintf(ghost_limit, "%"PRIu64, opts->user->ghost_limit); |
b2b7b0d2 | 478 | if (ret < 0 || ret >= sizeof(ghost_limit)) { |
9b945f13 | 479 | ERROR("failed to print ghost limit %"PRIu64, opts->user->ghost_limit); |
b2b7b0d2 TA |
480 | goto err; |
481 | } | |
482 | ||
483 | DECLARE_ARG("--ghost-limit"); | |
484 | DECLARE_ARG(ghost_limit); | |
485 | } | |
486 | ||
aef3d51e | 487 | /* only for final dump */ |
b2c3710f | 488 | if (strcmp(opts->action, "dump") == 0 && !opts->user->stop) |
e29fe1dd TA |
489 | DECLARE_ARG("--leave-running"); |
490 | } else if (strcmp(opts->action, "restore") == 0) { | |
491 | void *m; | |
492 | int additional; | |
13389b29 | 493 | struct lxc_conf *lxc_conf = opts->c->lxc_conf; |
e29fe1dd TA |
494 | |
495 | DECLARE_ARG("--root"); | |
496 | DECLARE_ARG(opts->c->lxc_conf->rootfs.mount); | |
497 | DECLARE_ARG("--restore-detached"); | |
498 | DECLARE_ARG("--restore-sibling"); | |
e29fe1dd | 499 | |
0e4be3cf | 500 | if (ttys[0]) { |
97e4f1a9 | 501 | if (opts->console_fd < 0) { |
3aed4934 | 502 | ERROR("lxc.console.path configured on source host but not target"); |
97e4f1a9 TA |
503 | goto err; |
504 | } | |
505 | ||
0e4be3cf | 506 | ret = snprintf(buf, sizeof(buf), "fd[%d]:%s", opts->console_fd, ttys); |
4b54788e TA |
507 | if (ret < 0 || ret >= sizeof(buf)) |
508 | goto err; | |
509 | ||
510 | DECLARE_ARG("--inherit-fd"); | |
511 | DECLARE_ARG(buf); | |
512 | } | |
513 | if (opts->console_name) { | |
514 | if (snprintf(buf, sizeof(buf), "console:%s", opts->console_name) < 0) { | |
515 | SYSERROR("sprintf'd too many bytes"); | |
516 | } | |
517 | DECLARE_ARG("--ext-mount-map"); | |
518 | DECLARE_ARG(buf); | |
519 | } | |
520 | ||
13389b29 TA |
521 | if (lxc_conf->lsm_aa_profile || lxc_conf->lsm_se_context) { |
522 | ||
523 | if (lxc_conf->lsm_aa_profile) | |
524 | ret = snprintf(buf, sizeof(buf), "apparmor:%s", lxc_conf->lsm_aa_profile); | |
525 | else | |
526 | ret = snprintf(buf, sizeof(buf), "selinux:%s", lxc_conf->lsm_se_context); | |
527 | ||
528 | if (ret < 0 || ret >= sizeof(buf)) | |
529 | goto err; | |
530 | ||
531 | DECLARE_ARG("--lsm-profile"); | |
532 | DECLARE_ARG(buf); | |
533 | } | |
534 | ||
e29fe1dd TA |
535 | additional = lxc_list_len(&opts->c->lxc_conf->network) * 2; |
536 | ||
fa071249 TA |
537 | m = realloc(argv, (argc + additional + 1) * sizeof(*argv)); |
538 | if (!m) | |
539 | goto err; | |
e29fe1dd TA |
540 | argv = m; |
541 | ||
542 | lxc_list_for_each(it, &opts->c->lxc_conf->network) { | |
9de31d5a | 543 | size_t retlen; |
e29fe1dd TA |
544 | char eth[128], *veth; |
545 | struct lxc_netdev *n = it->elem; | |
46c8ffd5 AR |
546 | bool external_not_veth; |
547 | ||
74ad3607 | 548 | if (cmp_version(opts->criu_version, CRIU_EXTERNAL_NOT_VETH) >= 0) { |
46c8ffd5 AR |
549 | /* Since criu version 2.8 the usage of --veth-pair |
550 | * has been deprecated: | |
551 | * git tag --contains f2037e6d3445fc400 | |
552 | * v2.8 */ | |
553 | external_not_veth = true; | |
554 | } else { | |
555 | external_not_veth = false; | |
556 | } | |
e29fe1dd | 557 | |
42277b1c | 558 | if (n->name[0] != '\0') { |
9de31d5a CB |
559 | retlen = strlcpy(eth, n->name, sizeof(eth)); |
560 | if (retlen >= sizeof(eth)) | |
e29fe1dd | 561 | goto err; |
796a109d TA |
562 | } else { |
563 | ret = snprintf(eth, sizeof(eth), "eth%d", netnr); | |
564 | if (ret < 0 || ret >= sizeof(eth)) | |
565 | goto err; | |
566 | } | |
e29fe1dd | 567 | |
e2697330 TA |
568 | switch (n->type) { |
569 | case LXC_NET_VETH: | |
570 | veth = n->priv.veth_attr.pair; | |
ea7f6b29 CB |
571 | if (veth[0] == '\0') |
572 | veth = n->priv.veth_attr.veth1; | |
e29fe1dd | 573 | |
de4855a8 | 574 | if (n->link[0] != '\0') { |
46c8ffd5 | 575 | if (external_not_veth) |
d07545c7 CB |
576 | ret = snprintf(buf, sizeof(buf), |
577 | "veth[%s]:%s@%s", | |
578 | eth, veth, | |
579 | n->link); | |
46c8ffd5 | 580 | else |
d07545c7 CB |
581 | ret = snprintf(buf, sizeof(buf), |
582 | "%s=%s@%s", eth, | |
583 | veth, n->link); | |
46c8ffd5 AR |
584 | } else { |
585 | if (external_not_veth) | |
d07545c7 CB |
586 | ret = snprintf(buf, sizeof(buf), |
587 | "veth[%s]:%s", | |
588 | eth, veth); | |
46c8ffd5 | 589 | else |
d07545c7 CB |
590 | ret = snprintf(buf, sizeof(buf), |
591 | "%s=%s", eth, | |
592 | veth); | |
46c8ffd5 | 593 | } |
e2697330 TA |
594 | if (ret < 0 || ret >= sizeof(buf)) |
595 | goto err; | |
596 | break; | |
597 | case LXC_NET_MACVLAN: | |
de4855a8 | 598 | if (n->link[0] == '\0') { |
9f1f54b0 | 599 | ERROR("no host interface for macvlan %s", n->name); |
e2697330 TA |
600 | goto err; |
601 | } | |
602 | ||
603 | ret = snprintf(buf, sizeof(buf), "macvlan[%s]:%s", eth, n->link); | |
604 | if (ret < 0 || ret >= sizeof(buf)) | |
605 | goto err; | |
606 | break; | |
607 | case LXC_NET_NONE: | |
608 | case LXC_NET_EMPTY: | |
609 | break; | |
610 | default: | |
611 | /* we have screened for this earlier... */ | |
9f1f54b0 | 612 | ERROR("unexpected network type %d", n->type); |
e29fe1dd | 613 | goto err; |
e2697330 | 614 | } |
e29fe1dd | 615 | |
46c8ffd5 AR |
616 | if (external_not_veth) |
617 | DECLARE_ARG("--external"); | |
618 | else | |
619 | DECLARE_ARG("--veth-pair"); | |
e29fe1dd | 620 | DECLARE_ARG(buf); |
2f3fbc6b | 621 | netnr++; |
e29fe1dd TA |
622 | } |
623 | ||
624 | } | |
625 | ||
626 | argv[argc] = NULL; | |
627 | ||
cf4b07a5 | 628 | buf[0] = 0; |
a17fa3c0 | 629 | pos = 0; |
72a30576 | 630 | |
cf4b07a5 | 631 | for (i = 0; argv[i]; i++) { |
72a30576 NE |
632 | ret = snprintf(buf + pos, sizeof(buf) - pos, "%s ", argv[i]); |
633 | if (ret < 0 || ret >= sizeof(buf) - pos) | |
634 | goto err; | |
635 | else | |
636 | pos += ret; | |
cf4b07a5 TA |
637 | } |
638 | ||
639 | INFO("execing: %s", buf); | |
640 | ||
5af85cb1 TA |
641 | /* before criu inits its log, it sometimes prints things to stdout/err; |
642 | * let's be sure we capture that. | |
643 | */ | |
644 | if (dup2(opts->pipefd, STDOUT_FILENO) < 0) { | |
645 | SYSERROR("dup2 stdout failed"); | |
646 | goto err; | |
647 | } | |
648 | ||
649 | if (dup2(opts->pipefd, STDERR_FILENO) < 0) { | |
650 | SYSERROR("dup2 stderr failed"); | |
651 | goto err; | |
652 | } | |
653 | ||
654 | close(opts->pipefd); | |
655 | ||
e29fe1dd TA |
656 | #undef DECLARE_ARG |
657 | execv(argv[0], argv); | |
658 | err: | |
e29fe1dd TA |
659 | for (i = 0; argv[i]; i++) |
660 | free(argv[i]); | |
661 | free(argv); | |
662 | } | |
663 | ||
b5b12b9e AR |
664 | /* |
665 | * Function to check if the checks activated in 'features_to_check' are | |
666 | * available with the current architecture/kernel/criu combination. | |
667 | * | |
668 | * Parameter features_to_check is a bit mask of all features that should be | |
669 | * checked (see feature check defines in lxc/lxccontainer.h). | |
670 | * | |
671 | * If the return value is true, all requested features are supported. If | |
672 | * the return value is false the features_to_check parameter is updated | |
673 | * to reflect which features are available. '0' means no feature but | |
674 | * also that something went totally wrong. | |
675 | * | |
676 | * Some of the code flow of criu_version_ok() is duplicated and maybe it | |
677 | * is a good candidate for refactoring. | |
678 | */ | |
679 | bool __criu_check_feature(uint64_t *features_to_check) | |
680 | { | |
681 | pid_t pid; | |
682 | uint64_t current_bit = 0; | |
683 | int ret; | |
fca23691 | 684 | uint64_t features = *features_to_check; |
b5b12b9e AR |
685 | /* Feature checking is currently always like |
686 | * criu check --feature <feature-name> | |
687 | */ | |
688 | char *args[] = { "criu", "check", "--feature", NULL, NULL }; | |
689 | ||
690 | if ((features & ~FEATURE_MEM_TRACK & ~FEATURE_LAZY_PAGES) != 0) { | |
691 | /* There are feature bits activated we do not understand. | |
692 | * Refusing to answer at all */ | |
693 | *features_to_check = 0; | |
694 | return false; | |
695 | } | |
696 | ||
6d61f17d | 697 | while (current_bit < (sizeof(uint64_t) * 8 - 1)) { |
b5b12b9e AR |
698 | /* only test requested features */ |
699 | if (!(features & (1ULL << current_bit))) { | |
700 | /* skip this */ | |
701 | current_bit++; | |
702 | continue; | |
703 | } | |
704 | ||
705 | pid = fork(); | |
706 | if (pid < 0) { | |
707 | SYSERROR("fork() failed"); | |
708 | *features_to_check = 0; | |
709 | return false; | |
710 | } | |
711 | ||
712 | if (pid == 0) { | |
713 | if ((1ULL << current_bit) == FEATURE_MEM_TRACK) | |
714 | /* This is needed for pre-dump support, which | |
715 | * enables pre-copy migration. */ | |
716 | args[3] = "mem_dirty_track"; | |
717 | else if ((1ULL << current_bit) == FEATURE_LAZY_PAGES) | |
718 | /* CRIU has two checks for userfaultfd support. | |
719 | * | |
720 | * The simpler check is only for 'uffd'. If the | |
721 | * kernel supports userfaultfd without noncoop | |
722 | * then only process can be lazily restored | |
723 | * which do not fork. With 'uffd-noncoop' | |
724 | * it is also possible to lazily restore processes | |
725 | * which do fork. For a container runtime like | |
726 | * LXC checking only for 'uffd' makes not much sense. */ | |
727 | args[3] = "uffd-noncoop"; | |
728 | else | |
4f43526d | 729 | _exit(EXIT_FAILURE); |
b5b12b9e AR |
730 | |
731 | null_stdfds(); | |
732 | ||
733 | execvp("criu", args); | |
734 | SYSERROR("Failed to exec \"criu\""); | |
4f43526d | 735 | _exit(EXIT_FAILURE); |
b5b12b9e AR |
736 | } |
737 | ||
738 | ret = wait_for_pid(pid); | |
739 | ||
740 | if (ret == -1) { | |
741 | /* It is not known why CRIU failed. Either | |
742 | * CRIU is not available, the feature check | |
743 | * does not exist or the feature is not | |
744 | * supported. */ | |
745 | INFO("feature not supported"); | |
746 | /* Clear not supported feature bit */ | |
747 | features &= ~(1ULL << current_bit); | |
748 | } | |
749 | ||
750 | current_bit++; | |
751 | /* no more checks requested; exit check loop */ | |
752 | if (!(features & ~((1ULL << current_bit)-1))) | |
753 | break; | |
754 | } | |
755 | if (features != *features_to_check) { | |
756 | *features_to_check = features; | |
757 | return false; | |
758 | } | |
759 | return true; | |
760 | } | |
761 | ||
8ba5ced7 TA |
762 | /* |
763 | * Check to see if the criu version is recent enough for all the features we | |
764 | * use. This version allows either CRIU_VERSION or (CRIU_GITID_VERSION and | |
765 | * CRIU_GITID_PATCHLEVEL) to work, enabling users building from git to c/r | |
766 | * things potentially before a version is released with a particular feature. | |
767 | * | |
768 | * The intent is that when criu development slows down, we can drop this, but | |
769 | * for now we shouldn't attempt to c/r with versions that we know won't work. | |
5407e2ab CB |
770 | * |
771 | * Note: If version != NULL criu_version() stores the detected criu version in | |
772 | * version. Allocates memory for version which must be freed by caller. | |
8ba5ced7 | 773 | */ |
5407e2ab | 774 | static bool criu_version_ok(char **version) |
8ba5ced7 TA |
775 | { |
776 | int pipes[2]; | |
777 | pid_t pid; | |
778 | ||
779 | if (pipe(pipes) < 0) { | |
780 | SYSERROR("pipe() failed"); | |
781 | return false; | |
782 | } | |
783 | ||
784 | pid = fork(); | |
785 | if (pid < 0) { | |
786 | SYSERROR("fork() failed"); | |
787 | return false; | |
788 | } | |
789 | ||
790 | if (pid == 0) { | |
791 | char *args[] = { "criu", "--version", NULL }; | |
755fa453 | 792 | char *path; |
8ba5ced7 TA |
793 | close(pipes[0]); |
794 | ||
795 | close(STDERR_FILENO); | |
796 | if (dup2(pipes[1], STDOUT_FILENO) < 0) | |
665bb114 | 797 | _exit(EXIT_FAILURE); |
8ba5ced7 | 798 | |
755fa453 | 799 | path = on_path("criu", NULL); |
d9b32b09 | 800 | if (!path) |
665bb114 | 801 | _exit(EXIT_FAILURE); |
d9b32b09 | 802 | |
755fa453 | 803 | execv(path, args); |
665bb114 | 804 | _exit(EXIT_FAILURE); |
8ba5ced7 TA |
805 | } else { |
806 | FILE *f; | |
5407e2ab | 807 | char *tmp; |
8ba5ced7 TA |
808 | int patch; |
809 | ||
810 | close(pipes[1]); | |
811 | if (wait_for_pid(pid) < 0) { | |
812 | close(pipes[0]); | |
4eae4051 | 813 | SYSERROR("execing criu failed, is it installed?"); |
8ba5ced7 TA |
814 | return false; |
815 | } | |
816 | ||
817 | f = fdopen(pipes[0], "r"); | |
818 | if (!f) { | |
819 | close(pipes[0]); | |
820 | return false; | |
821 | } | |
822 | ||
5407e2ab CB |
823 | tmp = malloc(1024); |
824 | if (!tmp) { | |
825 | fclose(f); | |
826 | return false; | |
827 | } | |
828 | ||
829 | if (fscanf(f, "Version: %1023[^\n]s", tmp) != 1) | |
8ba5ced7 TA |
830 | goto version_error; |
831 | ||
832 | if (fgetc(f) != '\n') | |
833 | goto version_error; | |
834 | ||
5407e2ab | 835 | if (strcmp(tmp, CRIU_VERSION) >= 0) |
8ba5ced7 TA |
836 | goto version_match; |
837 | ||
5407e2ab | 838 | if (fscanf(f, "GitID: v%1023[^-]s", tmp) != 1) |
8ba5ced7 TA |
839 | goto version_error; |
840 | ||
841 | if (fgetc(f) != '-') | |
842 | goto version_error; | |
843 | ||
844 | if (fscanf(f, "%d", &patch) != 1) | |
845 | goto version_error; | |
846 | ||
5407e2ab | 847 | if (strcmp(tmp, CRIU_GITID_VERSION) < 0) |
8ba5ced7 TA |
848 | goto version_error; |
849 | ||
850 | if (patch < CRIU_GITID_PATCHLEVEL) | |
851 | goto version_error; | |
852 | ||
853 | version_match: | |
3158ab5b | 854 | fclose(f); |
5407e2ab CB |
855 | if (!version) |
856 | free(tmp); | |
857 | else | |
858 | *version = tmp; | |
8ba5ced7 TA |
859 | return true; |
860 | ||
861 | version_error: | |
3158ab5b | 862 | fclose(f); |
5407e2ab | 863 | free(tmp); |
9f1f54b0 | 864 | ERROR("must have criu " CRIU_VERSION " or greater to checkpoint/restore"); |
8ba5ced7 TA |
865 | return false; |
866 | } | |
867 | } | |
868 | ||
e29fe1dd TA |
869 | /* Check and make sure the container has a configuration that we know CRIU can |
870 | * dump. */ | |
f1954503 | 871 | static bool criu_ok(struct lxc_container *c, char **criu_version) |
e29fe1dd TA |
872 | { |
873 | struct lxc_list *it; | |
e29fe1dd TA |
874 | |
875 | if (geteuid()) { | |
9f1f54b0 | 876 | ERROR("Must be root to checkpoint"); |
e29fe1dd TA |
877 | return false; |
878 | } | |
879 | ||
7177e6b1 DJ |
880 | if (!criu_version_ok(criu_version)) |
881 | return false; | |
882 | ||
e29fe1dd TA |
883 | /* We only know how to restore containers with veth networks. */ |
884 | lxc_list_for_each(it, &c->lxc_conf->network) { | |
885 | struct lxc_netdev *n = it->elem; | |
65b20221 TA |
886 | switch(n->type) { |
887 | case LXC_NET_VETH: | |
888 | case LXC_NET_NONE: | |
889 | case LXC_NET_EMPTY: | |
e2697330 | 890 | case LXC_NET_MACVLAN: |
65b20221 TA |
891 | break; |
892 | default: | |
9f1f54b0 | 893 | ERROR("Found un-dumpable network: %s (%s)", lxc_net_type_to_str(n->type), n->name); |
7177e6b1 DJ |
894 | if (criu_version) { |
895 | free(*criu_version); | |
896 | *criu_version = NULL; | |
897 | } | |
e29fe1dd TA |
898 | return false; |
899 | } | |
900 | } | |
901 | ||
e29fe1dd TA |
902 | return true; |
903 | } | |
904 | ||
e29fe1dd TA |
905 | static bool restore_net_info(struct lxc_container *c) |
906 | { | |
7eab8fc6 | 907 | int ret; |
e29fe1dd TA |
908 | struct lxc_list *it; |
909 | bool has_error = true; | |
910 | ||
911 | if (container_mem_lock(c)) | |
912 | return false; | |
913 | ||
914 | lxc_list_for_each(it, &c->lxc_conf->network) { | |
915 | struct lxc_netdev *netdev = it->elem; | |
916 | char template[IFNAMSIZ]; | |
65b20221 TA |
917 | |
918 | if (netdev->type != LXC_NET_VETH) | |
919 | continue; | |
920 | ||
7eab8fc6 CB |
921 | ret = snprintf(template, sizeof(template), "vethXXXXXX"); |
922 | if (ret < 0 || ret >= sizeof(template)) | |
923 | goto out_unlock; | |
e29fe1dd | 924 | |
de4855a8 CB |
925 | if (netdev->priv.veth_attr.pair[0] == '\0' && |
926 | netdev->priv.veth_attr.veth1[0] == '\0') { | |
966e9f1f | 927 | if (!lxc_mkifname(template)) |
de4855a8 CB |
928 | goto out_unlock; |
929 | ||
cbb9c7c7 | 930 | (void)strlcpy(netdev->priv.veth_attr.veth1, template, IFNAMSIZ); |
de4855a8 | 931 | } |
e29fe1dd TA |
932 | } |
933 | ||
934 | has_error = false; | |
935 | ||
936 | out_unlock: | |
937 | container_mem_unlock(c); | |
938 | return !has_error; | |
939 | } | |
940 | ||
1a0e70ac | 941 | /* do_restore never returns, the calling process is used as the monitor process. |
5a24adb8 | 942 | * do_restore calls _exit() if it fails. |
1a0e70ac | 943 | */ |
c33b0338 | 944 | static void do_restore(struct lxc_container *c, int status_pipe, struct migrate_opts *opts, char *criu_version) |
e29fe1dd | 945 | { |
5af9369b | 946 | int fd, ret; |
e29fe1dd | 947 | pid_t pid; |
e29fe1dd | 948 | struct lxc_handler *handler; |
113ebd57 | 949 | int status = 0; |
9b1e2e6e | 950 | int pipes[2] = {-1, -1}; |
2202afc9 | 951 | struct cgroup_ops *cgroup_ops; |
e29fe1dd | 952 | |
a7fb6043 | 953 | /* Try to detach from the current controlling tty if it exists. |
69e3b3be | 954 | * Otherwise, lxc_init (via lxc_console) will attach the container's |
a7fb6043 TA |
955 | * console output to the current tty, which is probably not what any |
956 | * library user wants, and if they do, they can just manually configure | |
957 | * it :) | |
958 | */ | |
959 | fd = open("/dev/tty", O_RDWR); | |
960 | if (fd >= 0) { | |
961 | if (ioctl(fd, TIOCNOTTY, NULL) < 0) | |
962 | SYSERROR("couldn't detach from tty"); | |
963 | close(fd); | |
964 | } | |
965 | ||
5e5576a4 | 966 | handler = lxc_init_handler(c->name, c->lxc_conf, c->config_path, false); |
e29fe1dd TA |
967 | if (!handler) |
968 | goto out; | |
969 | ||
aa460476 CB |
970 | if (lxc_init(c->name, handler) < 0) |
971 | goto out; | |
972 | ||
5a087e05 | 973 | cgroup_ops = cgroup_init(c->lxc_conf); |
2202afc9 | 974 | if (!cgroup_ops) |
e29fe1dd | 975 | goto out_fini_handler; |
2202afc9 | 976 | handler->cgroup_ops = cgroup_ops; |
e29fe1dd | 977 | |
e8b181f5 | 978 | if (!cgroup_ops->payload_create(cgroup_ops, handler)) { |
e29fe1dd TA |
979 | ERROR("failed creating groups"); |
980 | goto out_fini_handler; | |
981 | } | |
982 | ||
983 | if (!restore_net_info(c)) { | |
984 | ERROR("failed restoring network info"); | |
985 | goto out_fini_handler; | |
986 | } | |
987 | ||
5af9369b CB |
988 | ret = resolve_clone_flags(handler); |
989 | if (ret < 0) { | |
6d1400b5 | 990 | SYSERROR("Unsupported clone flag specified"); |
5af9369b CB |
991 | goto out_fini_handler; |
992 | } | |
e29fe1dd | 993 | |
de31cb57 | 994 | if (pipe2(pipes, O_CLOEXEC) < 0) { |
3d9a5c85 TA |
995 | SYSERROR("pipe() failed"); |
996 | goto out_fini_handler; | |
997 | } | |
998 | ||
e29fe1dd TA |
999 | pid = fork(); |
1000 | if (pid < 0) | |
1001 | goto out_fini_handler; | |
1002 | ||
1003 | if (pid == 0) { | |
1004 | struct criu_opts os; | |
1005 | struct lxc_rootfs *rootfs; | |
4b54788e | 1006 | int flags; |
e29fe1dd | 1007 | |
3d9a5c85 TA |
1008 | close(status_pipe); |
1009 | status_pipe = -1; | |
1010 | ||
1011 | close(pipes[0]); | |
1012 | pipes[0] = -1; | |
e29fe1dd TA |
1013 | |
1014 | if (unshare(CLONE_NEWNS)) | |
1015 | goto out_fini_handler; | |
1016 | ||
1017 | /* CRIU needs the lxc root bind mounted so that it is the root of some | |
1018 | * mount. */ | |
1019 | rootfs = &c->lxc_conf->rootfs; | |
1020 | ||
1021 | if (rootfs_is_blockdev(c->lxc_conf)) { | |
8ce1abc2 CB |
1022 | if (lxc_setup_rootfs_prepare_root(c->lxc_conf, c->name, |
1023 | c->config_path) < 0) | |
e29fe1dd TA |
1024 | goto out_fini_handler; |
1025 | } else { | |
1026 | if (mkdir(rootfs->mount, 0755) < 0 && errno != EEXIST) | |
1027 | goto out_fini_handler; | |
1028 | ||
1029 | if (mount(NULL, "/", NULL, MS_SLAVE | MS_REC, NULL) < 0) { | |
1030 | SYSERROR("remount / to private failed"); | |
1031 | goto out_fini_handler; | |
1032 | } | |
1033 | ||
1034 | if (mount(rootfs->path, rootfs->mount, NULL, MS_BIND, NULL) < 0) { | |
1035 | rmdir(rootfs->mount); | |
1036 | goto out_fini_handler; | |
1037 | } | |
1038 | } | |
1039 | ||
5af85cb1 | 1040 | os.pipefd = pipes[1]; |
e29fe1dd | 1041 | os.action = "restore"; |
b2c3710f | 1042 | os.user = opts; |
e29fe1dd | 1043 | os.c = c; |
4b54788e | 1044 | os.console_fd = c->lxc_conf->console.slave; |
f1954503 | 1045 | os.criu_version = criu_version; |
0ab5703f | 1046 | os.handler = handler; |
4b54788e | 1047 | |
97e4f1a9 TA |
1048 | if (os.console_fd >= 0) { |
1049 | /* Twiddle the FD_CLOEXEC bit. We want to pass this FD to criu | |
1050 | * via --inherit-fd, so we don't want it to close. | |
1051 | */ | |
1052 | flags = fcntl(os.console_fd, F_GETFD); | |
1053 | if (flags < 0) { | |
1054 | SYSERROR("F_GETFD failed: %d", os.console_fd); | |
1055 | goto out_fini_handler; | |
1056 | } | |
4b54788e | 1057 | |
97e4f1a9 | 1058 | flags &= ~FD_CLOEXEC; |
4b54788e | 1059 | |
97e4f1a9 TA |
1060 | if (fcntl(os.console_fd, F_SETFD, flags) < 0) { |
1061 | SYSERROR("F_SETFD failed"); | |
1062 | goto out_fini_handler; | |
1063 | } | |
4b54788e TA |
1064 | } |
1065 | os.console_name = c->lxc_conf->console.name; | |
e29fe1dd TA |
1066 | |
1067 | /* exec_criu() returning is an error */ | |
e20f46f8 | 1068 | exec_criu(cgroup_ops, c->lxc_conf, &os); |
e29fe1dd TA |
1069 | umount(rootfs->mount); |
1070 | rmdir(rootfs->mount); | |
1071 | goto out_fini_handler; | |
1072 | } else { | |
e29fe1dd TA |
1073 | char title[2048]; |
1074 | ||
3d9a5c85 TA |
1075 | close(pipes[1]); |
1076 | pipes[1] = -1; | |
1077 | ||
e29fe1dd TA |
1078 | pid_t w = waitpid(pid, &status, 0); |
1079 | if (w == -1) { | |
1080 | SYSERROR("waitpid"); | |
1081 | goto out_fini_handler; | |
1082 | } | |
1083 | ||
e29fe1dd | 1084 | if (WIFEXITED(status)) { |
75d219f0 TA |
1085 | char buf[4096]; |
1086 | ||
e29fe1dd | 1087 | if (WEXITSTATUS(status)) { |
3d9a5c85 TA |
1088 | int n; |
1089 | ||
668ba602 | 1090 | n = lxc_read_nointr(pipes[0], buf, sizeof(buf)); |
3d9a5c85 TA |
1091 | if (n < 0) { |
1092 | SYSERROR("failed reading from criu stderr"); | |
1093 | goto out_fini_handler; | |
1094 | } | |
1095 | ||
2735dfae TA |
1096 | if (n == sizeof(buf)) |
1097 | n--; | |
3d9a5c85 TA |
1098 | buf[n] = 0; |
1099 | ||
9f1f54b0 | 1100 | ERROR("criu process exited %d, output:\n%s", WEXITSTATUS(status), buf); |
e29fe1dd TA |
1101 | goto out_fini_handler; |
1102 | } else { | |
3eba9b49 | 1103 | ret = snprintf(buf, sizeof(buf), "/proc/self/task/%lu/children", (unsigned long)syscall(__NR_gettid)); |
75d219f0 TA |
1104 | if (ret < 0 || ret >= sizeof(buf)) { |
1105 | ERROR("snprintf'd too many characters: %d", ret); | |
1106 | goto out_fini_handler; | |
1107 | } | |
1108 | ||
1109 | FILE *f = fopen(buf, "r"); | |
e29fe1dd | 1110 | if (!f) { |
9f1f54b0 | 1111 | SYSERROR("couldn't read restore's children file %s", buf); |
e29fe1dd TA |
1112 | goto out_fini_handler; |
1113 | } | |
1114 | ||
1115 | ret = fscanf(f, "%d", (int*) &handler->pid); | |
1116 | fclose(f); | |
1117 | if (ret != 1) { | |
1118 | ERROR("reading restore pid failed"); | |
1119 | goto out_fini_handler; | |
1120 | } | |
1121 | ||
f8a41688 TA |
1122 | if (lxc_set_state(c->name, handler, RUNNING)) { |
1123 | ERROR("error setting running state after restore"); | |
e29fe1dd | 1124 | goto out_fini_handler; |
f8a41688 | 1125 | } |
e29fe1dd TA |
1126 | } |
1127 | } else { | |
9f1f54b0 | 1128 | ERROR("CRIU was killed with signal %d", WTERMSIG(status)); |
e29fe1dd TA |
1129 | goto out_fini_handler; |
1130 | } | |
1131 | ||
3d9a5c85 TA |
1132 | close(pipes[0]); |
1133 | ||
614be9bc | 1134 | ret = lxc_write_nointr(status_pipe, &status, sizeof(status)); |
f3886023 TA |
1135 | close(status_pipe); |
1136 | status_pipe = -1; | |
1137 | ||
1138 | if (sizeof(status) != ret) { | |
1139 | SYSERROR("failed to write all of status"); | |
1140 | goto out_fini_handler; | |
1141 | } | |
1142 | ||
e29fe1dd TA |
1143 | /* |
1144 | * See comment in lxcapi_start; we don't care if these | |
1145 | * fail because it's just a beauty thing. We just | |
1146 | * assign the return here to silence potential. | |
1147 | */ | |
1148 | ret = snprintf(title, sizeof(title), "[lxc monitor] %s %s", c->config_path, c->name); | |
223e30c1 CB |
1149 | if (ret < 0 || (size_t)ret >= sizeof(title)) |
1150 | INFO("Setting truncated process name"); | |
1151 | ||
e29fe1dd | 1152 | ret = setproctitle(title); |
223e30c1 CB |
1153 | if (ret < 0) |
1154 | INFO("Failed to set process name"); | |
e29fe1dd TA |
1155 | |
1156 | ret = lxc_poll(c->name, handler); | |
1157 | if (ret) | |
1158 | lxc_abort(c->name, handler); | |
1159 | lxc_fini(c->name, handler); | |
5a24adb8 | 1160 | _exit(ret); |
e29fe1dd TA |
1161 | } |
1162 | ||
1163 | out_fini_handler: | |
3d9a5c85 TA |
1164 | if (pipes[0] >= 0) |
1165 | close(pipes[0]); | |
1166 | if (pipes[1] >= 0) | |
1167 | close(pipes[1]); | |
1168 | ||
e29fe1dd TA |
1169 | lxc_fini(c->name, handler); |
1170 | ||
1171 | out: | |
3d9a5c85 | 1172 | if (status_pipe >= 0) { |
f3886023 TA |
1173 | /* ensure getting here was a failure, e.g. if we failed to |
1174 | * parse the child pid or something, even after a successful | |
1175 | * restore | |
1176 | */ | |
1177 | if (!status) | |
1178 | status = 1; | |
113ebd57 | 1179 | |
614be9bc | 1180 | if (lxc_write_nointr(status_pipe, &status, sizeof(status)) != sizeof(status)) |
e29fe1dd | 1181 | SYSERROR("writing status failed"); |
3d9a5c85 | 1182 | close(status_pipe); |
e29fe1dd TA |
1183 | } |
1184 | ||
5a24adb8 | 1185 | _exit(EXIT_FAILURE); |
e29fe1dd | 1186 | } |
aef3d51e | 1187 | |
4b54788e TA |
1188 | static int save_tty_major_minor(char *directory, struct lxc_container *c, char *tty_id, int len) |
1189 | { | |
1190 | FILE *f; | |
1191 | char path[PATH_MAX]; | |
1192 | int ret; | |
1193 | struct stat sb; | |
1194 | ||
1195 | if (c->lxc_conf->console.path && !strcmp(c->lxc_conf->console.path, "none")) { | |
1196 | tty_id[0] = 0; | |
1197 | return 0; | |
1198 | } | |
1199 | ||
1200 | ret = snprintf(path, sizeof(path), "/proc/%d/root/dev/console", c->init_pid(c)); | |
1201 | if (ret < 0 || ret >= sizeof(path)) { | |
f510330c | 1202 | ERROR("snprintf'd too many characters: %d", ret); |
4b54788e TA |
1203 | return -1; |
1204 | } | |
1205 | ||
1206 | ret = stat(path, &sb); | |
1207 | if (ret < 0) { | |
1208 | SYSERROR("stat of %s failed", path); | |
1209 | return -1; | |
1210 | } | |
1211 | ||
1212 | ret = snprintf(path, sizeof(path), "%s/tty.info", directory); | |
1213 | if (ret < 0 || ret >= sizeof(path)) { | |
1214 | ERROR("snprintf'd too many characters: %d", ret); | |
1215 | return -1; | |
1216 | } | |
1217 | ||
f03280a7 TA |
1218 | ret = snprintf(tty_id, len, "tty[%llx:%llx]", |
1219 | (long long unsigned) sb.st_rdev, | |
1220 | (long long unsigned) sb.st_dev); | |
4b54788e TA |
1221 | if (ret < 0 || ret >= sizeof(path)) { |
1222 | ERROR("snprintf'd too many characters: %d", ret); | |
1223 | return -1; | |
1224 | } | |
1225 | ||
1226 | f = fopen(path, "w"); | |
1227 | if (!f) { | |
1228 | SYSERROR("failed to open %s", path); | |
1229 | return -1; | |
1230 | } | |
1231 | ||
1232 | ret = fprintf(f, "%s", tty_id); | |
1233 | fclose(f); | |
1234 | if (ret < 0) | |
1235 | SYSERROR("failed to write to %s", path); | |
1236 | return ret; | |
1237 | } | |
1238 | ||
aef3d51e | 1239 | /* do one of either predump or a regular dump */ |
b2c3710f | 1240 | static bool do_dump(struct lxc_container *c, char *mode, struct migrate_opts *opts) |
aef3d51e | 1241 | { |
0e4adc1a | 1242 | int ret; |
aef3d51e | 1243 | pid_t pid; |
5af85cb1 | 1244 | int criuout[2]; |
0e4adc1a | 1245 | char *criu_version = NULL; |
aef3d51e | 1246 | |
f1954503 | 1247 | if (!criu_ok(c, &criu_version)) |
aef3d51e TA |
1248 | return false; |
1249 | ||
0e4adc1a CB |
1250 | ret = pipe(criuout); |
1251 | if (ret < 0) { | |
5af85cb1 | 1252 | SYSERROR("pipe() failed"); |
7177e6b1 | 1253 | free(criu_version); |
aef3d51e | 1254 | return false; |
5af85cb1 TA |
1255 | } |
1256 | ||
1257 | if (mkdir_p(opts->directory, 0700) < 0) | |
1258 | goto fail; | |
aef3d51e TA |
1259 | |
1260 | pid = fork(); | |
1261 | if (pid < 0) { | |
1262 | SYSERROR("fork failed"); | |
5af85cb1 | 1263 | goto fail; |
aef3d51e TA |
1264 | } |
1265 | ||
1266 | if (pid == 0) { | |
1267 | struct criu_opts os; | |
2202afc9 | 1268 | struct cgroup_ops *cgroup_ops; |
0ab5703f | 1269 | |
5af85cb1 TA |
1270 | close(criuout[0]); |
1271 | ||
5a087e05 | 1272 | cgroup_ops = cgroup_init(c->lxc_conf); |
2202afc9 | 1273 | if (!cgroup_ops) { |
0ab5703f | 1274 | ERROR("failed to cgroup_init()"); |
7211378b | 1275 | _exit(EXIT_FAILURE); |
0ab5703f | 1276 | } |
aef3d51e | 1277 | |
5af85cb1 | 1278 | os.pipefd = criuout[1]; |
aef3d51e | 1279 | os.action = mode; |
b2c3710f | 1280 | os.user = opts; |
aef3d51e | 1281 | os.c = c; |
4b54788e | 1282 | os.console_name = c->lxc_conf->console.path; |
f1954503 | 1283 | os.criu_version = criu_version; |
e20f46f8 | 1284 | os.handler = NULL; |
74eb576c | 1285 | |
0e4adc1a CB |
1286 | ret = save_tty_major_minor(opts->directory, c, os.tty_id, sizeof(os.tty_id)); |
1287 | if (ret < 0) { | |
1288 | free(criu_version); | |
7211378b | 1289 | _exit(EXIT_FAILURE); |
0e4adc1a | 1290 | } |
aef3d51e TA |
1291 | |
1292 | /* exec_criu() returning is an error */ | |
e20f46f8 | 1293 | exec_criu(cgroup_ops, c->lxc_conf, &os); |
0e4adc1a | 1294 | free(criu_version); |
7211378b | 1295 | _exit(EXIT_FAILURE); |
aef3d51e TA |
1296 | } else { |
1297 | int status; | |
5af85cb1 TA |
1298 | ssize_t n; |
1299 | char buf[4096]; | |
5af85cb1 TA |
1300 | |
1301 | close(criuout[1]); | |
1302 | ||
aef3d51e TA |
1303 | pid_t w = waitpid(pid, &status, 0); |
1304 | if (w == -1) { | |
1305 | SYSERROR("waitpid"); | |
5af85cb1 | 1306 | close(criuout[0]); |
7177e6b1 | 1307 | free(criu_version); |
aef3d51e TA |
1308 | return false; |
1309 | } | |
1310 | ||
668ba602 | 1311 | n = lxc_read_nointr(criuout[0], buf, sizeof(buf)); |
5af85cb1 TA |
1312 | close(criuout[0]); |
1313 | if (n < 0) { | |
1314 | SYSERROR("read"); | |
1315 | n = 0; | |
1316 | } | |
40229e95 | 1317 | |
1318 | if (n == sizeof(buf)) | |
1319 | buf[n-1] = 0; | |
1320 | else | |
1321 | buf[n] = 0; | |
5af85cb1 | 1322 | |
aef3d51e TA |
1323 | if (WIFEXITED(status)) { |
1324 | if (WEXITSTATUS(status)) { | |
9f1f54b0 | 1325 | ERROR("dump failed with %d", WEXITSTATUS(status)); |
5af85cb1 TA |
1326 | ret = false; |
1327 | } else { | |
1328 | ret = true; | |
aef3d51e | 1329 | } |
aef3d51e | 1330 | } else if (WIFSIGNALED(status)) { |
9f1f54b0 | 1331 | ERROR("dump signaled with %d", WTERMSIG(status)); |
5af85cb1 | 1332 | ret = false; |
aef3d51e | 1333 | } else { |
9f1f54b0 | 1334 | ERROR("unknown dump exit %d", status); |
5af85cb1 | 1335 | ret = false; |
aef3d51e | 1336 | } |
5af85cb1 TA |
1337 | |
1338 | if (!ret) | |
1339 | ERROR("criu output: %s", buf); | |
7177e6b1 DJ |
1340 | |
1341 | free(criu_version); | |
5af85cb1 | 1342 | return ret; |
aef3d51e | 1343 | } |
5af85cb1 TA |
1344 | fail: |
1345 | close(criuout[0]); | |
1346 | close(criuout[1]); | |
1347 | rmdir(opts->directory); | |
0e4adc1a | 1348 | free(criu_version); |
5af85cb1 | 1349 | return false; |
aef3d51e TA |
1350 | } |
1351 | ||
b2c3710f | 1352 | bool __criu_pre_dump(struct lxc_container *c, struct migrate_opts *opts) |
aef3d51e | 1353 | { |
b2c3710f | 1354 | return do_dump(c, "pre-dump", opts); |
aef3d51e TA |
1355 | } |
1356 | ||
b2c3710f | 1357 | bool __criu_dump(struct lxc_container *c, struct migrate_opts *opts) |
aef3d51e TA |
1358 | { |
1359 | char path[PATH_MAX]; | |
1360 | int ret; | |
1361 | ||
b2c3710f | 1362 | ret = snprintf(path, sizeof(path), "%s/inventory.img", opts->directory); |
aef3d51e TA |
1363 | if (ret < 0 || ret >= sizeof(path)) |
1364 | return false; | |
1365 | ||
1366 | if (access(path, F_OK) == 0) { | |
9f1f54b0 | 1367 | ERROR("please use a fresh directory for the dump directory"); |
aef3d51e TA |
1368 | return false; |
1369 | } | |
1370 | ||
b2c3710f | 1371 | return do_dump(c, "dump", opts); |
aef3d51e TA |
1372 | } |
1373 | ||
b2c3710f | 1374 | bool __criu_restore(struct lxc_container *c, struct migrate_opts *opts) |
aef3d51e TA |
1375 | { |
1376 | pid_t pid; | |
1377 | int status, nread; | |
1378 | int pipefd[2]; | |
f1954503 | 1379 | char *criu_version = NULL; |
aef3d51e | 1380 | |
aef3d51e | 1381 | if (geteuid()) { |
9f1f54b0 | 1382 | ERROR("Must be root to restore"); |
aef3d51e TA |
1383 | return false; |
1384 | } | |
1385 | ||
1386 | if (pipe(pipefd)) { | |
1387 | ERROR("failed to create pipe"); | |
1388 | return false; | |
1389 | } | |
1390 | ||
7177e6b1 DJ |
1391 | if (!criu_ok(c, &criu_version)) { |
1392 | close(pipefd[0]); | |
1393 | close(pipefd[1]); | |
1394 | return false; | |
1395 | } | |
1396 | ||
aef3d51e TA |
1397 | pid = fork(); |
1398 | if (pid < 0) { | |
1399 | close(pipefd[0]); | |
1400 | close(pipefd[1]); | |
7177e6b1 | 1401 | free(criu_version); |
aef3d51e TA |
1402 | return false; |
1403 | } | |
1404 | ||
1405 | if (pid == 0) { | |
1406 | close(pipefd[0]); | |
1a0e70ac | 1407 | /* this never returns */ |
f1954503 | 1408 | do_restore(c, pipefd[1], opts, criu_version); |
aef3d51e TA |
1409 | } |
1410 | ||
1411 | close(pipefd[1]); | |
7177e6b1 | 1412 | free(criu_version); |
aef3d51e | 1413 | |
668ba602 | 1414 | nread = lxc_read_nointr(pipefd[0], &status, sizeof(status)); |
aef3d51e TA |
1415 | close(pipefd[0]); |
1416 | if (sizeof(status) != nread) { | |
1417 | ERROR("reading status from pipe failed"); | |
1418 | goto err_wait; | |
1419 | } | |
1420 | ||
1a0e70ac CB |
1421 | /* If the criu process was killed or exited nonzero, wait() for the |
1422 | * handler, since the restore process died. Otherwise, we don't need to | |
1423 | * wait, since the child becomes the monitor process. | |
1424 | */ | |
aef3d51e TA |
1425 | if (!WIFEXITED(status) || WEXITSTATUS(status)) |
1426 | goto err_wait; | |
1427 | return true; | |
1428 | ||
1429 | err_wait: | |
1430 | if (wait_for_pid(pid)) | |
1431 | ERROR("restore process died"); | |
1432 | return false; | |
1433 | } |