3 * Copyright © 2012 Serge Hallyn <serge.hallyn@ubuntu.com>.
4 * Copyright © 2012 Canonical Ltd.
6 * This library is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
9 * version 2.1 of the License, or (at your option) any later version.
11 * This library is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Lesser General Public License for more details.
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with this library; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
26 #include <sys/types.h>
28 #include <sys/mount.h>
34 #include <arpa/inet.h>
38 #include <sys/syscall.h>
40 #include <lxc/lxccontainer.h>
41 #include <lxc/version.h>
56 #include "namespace.h"
63 #include <../include/ifaddrs.h>
66 #define MAX_BUFFER 4096
68 #define NOT_SUPPORTED_ERROR "the requested function %s is not currently supported with unprivileged containers"
70 /* Define faccessat() if missing from the C library */
71 #ifndef HAVE_FACCESSAT
72 static int faccessat(int __fd
, const char *__file
, int __type
, int __flag
)
75 return syscall(__NR_faccessat
, __fd
, __file
, __type
, __flag
);
84 lxc_log_define(lxc_container
, lxc
);
86 static bool config_file_exists(const char *lxcpath
, const char *cname
)
88 /* $lxcpath + '/' + $cname + '/config' + \0 */
89 int ret
, len
= strlen(lxcpath
) + strlen(cname
) + 9;
90 char *fname
= alloca(len
);
92 ret
= snprintf(fname
, len
, "%s/%s/config", lxcpath
, cname
);
93 if (ret
< 0 || ret
>= len
)
96 return file_exists(fname
);
100 * A few functions to help detect when a container creation failed.
101 * If a container creation was killed partway through, then trying
102 * to actually start that container could harm the host. We detect
103 * this by creating a 'partial' file under the container directory,
104 * and keeping an advisory lock. When container creation completes,
105 * we remove that file. When we load or try to start a container, if
106 * we find that file, without a flock, we remove the container.
108 static int ongoing_create(struct lxc_container
*c
)
110 int len
= strlen(c
->config_path
) + strlen(c
->name
) + 10;
111 char *path
= alloca(len
);
115 ret
= snprintf(path
, len
, "%s/%s/partial", c
->config_path
, c
->name
);
116 if (ret
< 0 || ret
>= len
) {
117 ERROR("Error writing partial pathname");
121 if (!file_exists(path
))
123 fd
= open(path
, O_RDWR
);
125 // give benefit of the doubt
126 SYSERROR("Error opening partial file");
130 lk
.l_whence
= SEEK_SET
;
134 if (fcntl(fd
, F_GETLK
, &lk
) == 0 && lk
.l_pid
!= -1) {
135 // create is still ongoing
139 // create completed but partial is still there.
144 static int create_partial(struct lxc_container
*c
)
146 // $lxcpath + '/' + $name + '/partial' + \0
147 int len
= strlen(c
->config_path
) + strlen(c
->name
) + 10;
148 char *path
= alloca(len
);
152 ret
= snprintf(path
, len
, "%s/%s/partial", c
->config_path
, c
->name
);
153 if (ret
< 0 || ret
>= len
) {
154 ERROR("Error writing partial pathname");
157 if ((fd
=open(path
, O_RDWR
| O_CREAT
| O_EXCL
, 0755)) < 0) {
158 SYSERROR("Erorr creating partial file");
162 lk
.l_whence
= SEEK_SET
;
165 if (fcntl(fd
, F_SETLKW
, &lk
) < 0) {
166 SYSERROR("Error locking partial file %s", path
);
174 static void remove_partial(struct lxc_container
*c
, int fd
)
176 // $lxcpath + '/' + $name + '/partial' + \0
177 int len
= strlen(c
->config_path
) + strlen(c
->name
) + 10;
178 char *path
= alloca(len
);
182 ret
= snprintf(path
, len
, "%s/%s/partial", c
->config_path
, c
->name
);
183 if (ret
< 0 || ret
>= len
) {
184 ERROR("Error writing partial pathname");
187 if (unlink(path
) < 0)
188 SYSERROR("Error unlink partial file %s", path
);
192 * 1. container_mem_lock(c) protects the struct lxc_container from multiple threads.
193 * 2. container_disk_lock(c) protects the on-disk container data - in particular the
194 * container configuration file.
195 * The container_disk_lock also takes the container_mem_lock.
196 * 3. thread_mutex protects process data (ex: fd table) from multiple threads.
197 * NOTHING mutexes two independent programs with their own struct
198 * lxc_container for the same c->name, between API calls. For instance,
199 * c->config_read(); c->start(); Between those calls, data on disk
200 * could change (which shouldn't bother the caller unless for instance
201 * the rootfs get moved). c->config_read(); update; c->config_write();
202 * Two such updaters could race. The callers should therefore check their
203 * results. Trying to prevent that would necessarily expose us to deadlocks
204 * due to hung callers. So I prefer to keep the locks only within our own
205 * functions, not across functions.
207 * If you're going to clone while holding a lxccontainer, increment
208 * c->numthreads (under privlock) before forking. When deleting,
209 * decrement numthreads under privlock, then if it hits 0 you can delete.
210 * Do not ever use a lxccontainer whose numthreads you did not bump.
213 static void lxc_container_free(struct lxc_container
*c
)
220 c
->configfile
= NULL
;
222 if (c
->error_string
) {
223 free(c
->error_string
);
224 c
->error_string
= NULL
;
227 lxc_putlock(c
->slock
);
231 lxc_putlock(c
->privlock
);
239 lxc_conf_free(c
->lxc_conf
);
242 if (c
->config_path
) {
243 free(c
->config_path
);
244 c
->config_path
= NULL
;
251 * Consider the following case:
252 freer | racing get()er
253 ==================================================================
254 lxc_container_put() | lxc_container_get()
255 \ lxclock(c->privlock) | c->numthreads < 1? (no)
256 \ c->numthreads = 0 | \ lxclock(c->privlock) -> waits
258 \ lxc_container_free() | \ lxclock() returns
259 | \ c->numthreads < 1 -> return 0
261 \ \ sem_destroy(privlock) |
263 * When the get()er checks numthreads the first time, one of the following
265 * 1. freer has set numthreads = 0. get() returns 0
266 * 2. freer is between lxclock and setting numthreads to 0. get()er will
267 * sem_wait on privlock, get lxclock after freer() drops it, then see
268 * numthreads is 0 and exit without touching lxclock again..
269 * 3. freer has not yet locked privlock. If get()er runs first, then put()er
270 * will see --numthreads = 1 and not call lxc_container_free().
273 int lxc_container_get(struct lxc_container
*c
)
278 // if someone else has already started freeing the container, don't
279 // try to take the lock, which may be invalid
280 if (c
->numthreads
< 1)
283 if (container_mem_lock(c
))
285 if (c
->numthreads
< 1) {
286 // bail without trying to unlock, bc the privlock is now probably
291 container_mem_unlock(c
);
295 int lxc_container_put(struct lxc_container
*c
)
299 if (container_mem_lock(c
))
301 if (--c
->numthreads
< 1) {
302 container_mem_unlock(c
);
303 lxc_container_free(c
);
306 container_mem_unlock(c
);
310 static bool lxcapi_is_defined(struct lxc_container
*c
)
319 if (container_mem_lock(c
))
323 statret
= stat(c
->configfile
, &statbuf
);
329 container_mem_unlock(c
);
333 static const char *lxcapi_state(struct lxc_container
*c
)
339 s
= lxc_getstate(c
->name
, c
->config_path
);
340 return lxc_state2str(s
);
343 static bool is_stopped(struct lxc_container
*c
)
346 s
= lxc_getstate(c
->name
, c
->config_path
);
347 return (s
== STOPPED
);
350 static bool lxcapi_is_running(struct lxc_container
*c
)
357 if (!s
|| strcmp(s
, "STOPPED") == 0)
362 static bool lxcapi_freeze(struct lxc_container
*c
)
368 ret
= lxc_freeze(c
->name
, c
->config_path
);
374 static bool lxcapi_unfreeze(struct lxc_container
*c
)
380 ret
= lxc_unfreeze(c
->name
, c
->config_path
);
386 static int lxcapi_console_getfd(struct lxc_container
*c
, int *ttynum
, int *masterfd
)
392 ttyfd
= lxc_console_getfd(c
, ttynum
, masterfd
);
396 static int lxcapi_console(struct lxc_container
*c
, int ttynum
, int stdinfd
,
397 int stdoutfd
, int stderrfd
, int escape
)
399 return lxc_console(c
, ttynum
, stdinfd
, stdoutfd
, stderrfd
, escape
);
402 static pid_t
lxcapi_init_pid(struct lxc_container
*c
)
407 return lxc_cmd_get_init_pid(c
->name
, c
->config_path
);
410 static bool load_config_locked(struct lxc_container
*c
, const char *fname
)
413 c
->lxc_conf
= lxc_conf_init();
416 if (lxc_config_read(fname
, c
->lxc_conf
, false) != 0)
421 static bool lxcapi_load_config(struct lxc_container
*c
, const char *alt_file
)
423 bool ret
= false, need_disklock
= false;
429 fname
= c
->configfile
;
435 * If we're reading something other than the container's config,
436 * we only need to lock the in-memory container. If loading the
437 * container's config file, take the disk lock.
439 if (strcmp(fname
, c
->configfile
) == 0)
440 need_disklock
= true;
443 lret
= container_disk_lock(c
);
445 lret
= container_mem_lock(c
);
449 ret
= load_config_locked(c
, fname
);
452 container_disk_unlock(c
);
454 container_mem_unlock(c
);
458 static bool lxcapi_want_daemonize(struct lxc_container
*c
, bool state
)
460 if (!c
|| !c
->lxc_conf
)
462 if (container_mem_lock(c
)) {
463 ERROR("Error getting mem lock");
466 c
->daemonize
= state
;
467 /* daemonize implies close_all_fds so set it */
469 c
->lxc_conf
->close_all_fds
= 1;
470 container_mem_unlock(c
);
474 static bool lxcapi_want_close_all_fds(struct lxc_container
*c
, bool state
)
476 if (!c
|| !c
->lxc_conf
)
478 if (container_mem_lock(c
)) {
479 ERROR("Error getting mem lock");
482 c
->lxc_conf
->close_all_fds
= state
;
483 container_mem_unlock(c
);
487 static bool lxcapi_wait(struct lxc_container
*c
, const char *state
, int timeout
)
494 ret
= lxc_wait(c
->name
, state
, timeout
, c
->config_path
);
499 static bool wait_on_daemonized_start(struct lxc_container
*c
, int pid
)
501 /* we'll probably want to make this timeout configurable? */
502 int timeout
= 5, ret
, status
;
505 * our child is going to fork again, then exit. reap the
508 ret
= waitpid(pid
, &status
, 0);
509 if (ret
== -1 || !WIFEXITED(status
) || WEXITSTATUS(status
) != 0)
510 DEBUG("failed waiting for first dual-fork child");
511 return lxcapi_wait(c
, "RUNNING", timeout
);
514 static bool am_single_threaded(void)
516 struct dirent dirent
, *direntp
;
520 dir
= opendir("/proc/self/task");
522 INFO("failed to open /proc/self/task");
526 while (!readdir_r(dir
, &dirent
, &direntp
)) {
530 if (!strcmp(direntp
->d_name
, "."))
533 if (!strcmp(direntp
->d_name
, ".."))
543 * I can't decide if it'd be more convenient for callers if we accept '...',
544 * or a null-terminated array (i.e. execl vs execv)
546 static bool lxcapi_start(struct lxc_container
*c
, int useinit
, char * const argv
[])
549 struct lxc_conf
*conf
;
550 bool daemonize
= false;
552 char *default_args
[] = {
557 /* container exists */
560 /* container has been setup */
564 if ((ret
= ongoing_create(c
)) < 0) {
565 ERROR("Error checking for incomplete creation");
569 ERROR("Error: %s creation was not completed", c
->name
);
572 } else if (ret
== 1) {
573 ERROR("Error: creation of %s is ongoing", c
->name
);
577 /* is this app meant to be run through lxcinit, as in lxc-execute? */
578 if (useinit
&& !argv
)
581 if (container_mem_lock(c
))
584 daemonize
= c
->daemonize
;
585 container_mem_unlock(c
);
588 ret
= lxc_execute(c
->name
, argv
, 1, conf
, c
->config_path
);
589 return ret
== 0 ? true : false;
596 * say, I'm not sure - what locks do we want here? Any?
597 * Is liblxc's locking enough here to protect the on disk
598 * container? We don't want to exclude things like lxc_info
599 * while container is running...
602 lxc_monitord_spawn(c
->config_path
);
609 /* Set to NULL because we don't want father unlink
610 * the PID file, child will do the free and unlink.
613 return wait_on_daemonized_start(c
, pid
);
616 /* second fork to be reparented by init */
619 SYSERROR("Error doing dual-fork");
624 /* like daemon(), chdir to / and redirect 0,1,2 to /dev/null */
626 SYSERROR("Error chdir()ing to /.");
629 lxc_check_inherited(conf
, -1);
633 open("/dev/zero", O_RDONLY
);
634 open("/dev/null", O_RDWR
);
635 open("/dev/null", O_RDWR
);
638 if (!am_single_threaded()) {
639 ERROR("Cannot start non-daemonized container when threaded");
644 /* We need to write PID file after daeminize, so we always
645 * write the right PID.
648 pid_fp
= fopen(c
->pidfile
, "w");
649 if (pid_fp
== NULL
) {
650 SYSERROR("Failed to create pidfile '%s' for '%s'",
651 c
->pidfile
, c
->name
);
655 if (fprintf(pid_fp
, "%d\n", getpid()) < 0) {
656 SYSERROR("Failed to write '%s'", c
->pidfile
);
668 ret
= lxc_start(c
->name
, argv
, conf
, c
->config_path
);
672 INFO("container requested reboot");
684 exit (ret
== 0 ? true : false);
686 return (ret
== 0 ? true : false);
690 * note there MUST be an ending NULL
692 static bool lxcapi_startl(struct lxc_container
*c
, int useinit
, ...)
695 char **inargs
= NULL
;
698 /* container exists */
702 va_start(ap
, useinit
);
703 inargs
= lxc_va_arg_list_to_argv(ap
, 0, 1);
707 ERROR("Memory allocation error.");
711 /* pass NULL if no arguments were supplied */
712 bret
= lxcapi_start(c
, useinit
, *inargs
? inargs
: NULL
);
717 for (arg
= inargs
; *arg
; arg
++)
725 static bool lxcapi_stop(struct lxc_container
*c
)
732 ret
= lxc_cmd_stop(c
->name
, c
->config_path
);
737 static int do_create_container_dir(const char *path
, struct lxc_conf
*conf
)
739 int ret
= -1, lasterr
;
740 char *p
= alloca(strlen(path
)+1);
741 mode_t mask
= umask(0002);
742 ret
= mkdir(path
, 0770);
750 SYSERROR("failed to create container path %s", path
);
755 if (!lxc_list_empty(&conf
->id_map
) && chown_mapped_root(p
, conf
) != 0) {
756 ERROR("Failed to chown container dir");
763 * create the standard expected container dir
765 static bool create_container_dir(struct lxc_container
*c
)
770 len
= strlen(c
->config_path
) + strlen(c
->name
) + 2;
774 ret
= snprintf(s
, len
, "%s/%s", c
->config_path
, c
->name
);
775 if (ret
< 0 || ret
>= len
) {
779 ret
= do_create_container_dir(s
, c
->lxc_conf
);
784 static const char *lxcapi_get_config_path(struct lxc_container
*c
);
785 static bool lxcapi_set_config_item(struct lxc_container
*c
, const char *key
, const char *v
);
788 * do_bdev_create: thin wrapper around bdev_create(). Like bdev_create(),
789 * it returns a mounted bdev on success, NULL on error.
791 static struct bdev
*do_bdev_create(struct lxc_container
*c
, const char *type
,
792 struct bdev_specs
*specs
)
799 /* rootfs.path or lxcpath/lxcname/rootfs */
800 if (c
->lxc_conf
->rootfs
.path
&& access(c
->lxc_conf
->rootfs
.path
, F_OK
) == 0) {
801 const char *rpath
= c
->lxc_conf
->rootfs
.path
;
802 len
= strlen(rpath
) + 1;
804 ret
= snprintf(dest
, len
, "%s", rpath
);
806 const char *lxcpath
= lxcapi_get_config_path(c
);
807 len
= strlen(c
->name
) + strlen(lxcpath
) + 9;
809 ret
= snprintf(dest
, len
, "%s/%s/rootfs", lxcpath
, c
->name
);
811 if (ret
< 0 || ret
>= len
)
814 bdev
= bdev_create(dest
, type
, c
->name
, specs
);
816 ERROR("Failed to create backing store type %s", type
);
820 lxcapi_set_config_item(c
, "lxc.rootfs", bdev
->src
);
822 /* if we are not root, chown the rootfs dir to root in the
825 if (geteuid() != 0 || (c
->lxc_conf
&& !lxc_list_empty(&c
->lxc_conf
->id_map
))) {
826 if (chown_mapped_root(bdev
->dest
, c
->lxc_conf
) < 0) {
827 ERROR("Error chowning %s to container root", bdev
->dest
);
828 suggest_default_idmap();
838 * Given the '-t' template option to lxc-create, figure out what to
839 * do. If the template is a full executable path, use that. If it
840 * is something like 'sshd', then return $templatepath/lxc-sshd.
841 * On success return the template, on error return NULL.
843 static char *get_template_path(const char *t
)
848 if (t
[0] == '/' && access(t
, X_OK
) == 0) {
853 len
= strlen(LXCTEMPLATEDIR
) + strlen(t
) + strlen("/lxc-") + 1;
857 ret
= snprintf(tpath
, len
, "%s/lxc-%s", LXCTEMPLATEDIR
, t
);
858 if (ret
< 0 || ret
>= len
) {
862 if (access(tpath
, X_OK
) < 0) {
863 SYSERROR("bad template: %s", t
);
871 static char *lxcbasename(char *path
)
873 char *p
= path
+ strlen(path
) - 1;
874 while (*p
!= '/' && p
> path
)
879 static bool create_run_template(struct lxc_container
*c
, char *tpath
, bool quiet
,
889 SYSERROR("failed to fork task for container creation template");
893 if (pid
== 0) { // child
894 char *patharg
, *namearg
, *rootfsarg
, *src
;
895 struct bdev
*bdev
= NULL
;
897 int ret
, len
, nargs
= 0;
899 struct lxc_conf
*conf
= c
->lxc_conf
;
905 open("/dev/zero", O_RDONLY
);
906 open("/dev/null", O_RDWR
);
907 open("/dev/null", O_RDWR
);
910 src
= c
->lxc_conf
->rootfs
.path
;
912 * for an overlay create, what the user wants is the template to fill
913 * in what will become the readonly lower layer. So don't mount for
916 if (strncmp(src
, "overlayfs:", 10) == 0)
917 src
= overlay_getlower(src
+10);
918 if (strncmp(src
, "aufs:", 5) == 0)
919 src
= overlay_getlower(src
+5);
921 bdev
= bdev_init(c
->lxc_conf
, src
, c
->lxc_conf
->rootfs
.mount
, NULL
);
923 ERROR("Error opening rootfs");
927 if (geteuid() == 0) {
928 if (unshare(CLONE_NEWNS
) < 0) {
929 ERROR("error unsharing mounts");
932 if (detect_shared_rootfs()) {
933 if (mount(NULL
, "/", NULL
, MS_SLAVE
|MS_REC
, NULL
)) {
934 SYSERROR("Failed to make / rslave to run template");
935 ERROR("Continuing...");
939 if (strcmp(bdev
->type
, "dir") && strcmp(bdev
->type
, "btrfs")) {
940 if (geteuid() != 0) {
941 ERROR("non-root users can only create btrfs and directory-backed containers");
944 if (bdev
->ops
->mount(bdev
) < 0) {
945 ERROR("Error mounting rootfs");
948 } else { // TODO come up with a better way here!
951 bdev
->dest
= strdup(bdev
->src
);
955 * create our new array, pre-pend the template name and
959 for (nargs
= 0; argv
[nargs
]; nargs
++) ;
960 nargs
+= 4; // template, path, rootfs and name args
962 newargv
= malloc(nargs
* sizeof(*newargv
));
965 newargv
[0] = lxcbasename(tpath
);
967 len
= strlen(c
->config_path
) + strlen(c
->name
) + strlen("--path=") + 2;
968 patharg
= malloc(len
);
971 ret
= snprintf(patharg
, len
, "--path=%s/%s", c
->config_path
, c
->name
);
972 if (ret
< 0 || ret
>= len
)
974 newargv
[1] = patharg
;
975 len
= strlen("--name=") + strlen(c
->name
) + 1;
976 namearg
= malloc(len
);
979 ret
= snprintf(namearg
, len
, "--name=%s", c
->name
);
980 if (ret
< 0 || ret
>= len
)
982 newargv
[2] = namearg
;
984 len
= strlen("--rootfs=") + 1 + strlen(bdev
->dest
);
985 rootfsarg
= malloc(len
);
988 ret
= snprintf(rootfsarg
, len
, "--rootfs=%s", bdev
->dest
);
989 if (ret
< 0 || ret
>= len
)
991 newargv
[3] = rootfsarg
;
993 /* add passed-in args */
995 for (i
= 4; i
< nargs
; i
++)
996 newargv
[i
] = argv
[i
-4];
998 /* add trailing NULL */
1000 newargv
= realloc(newargv
, nargs
* sizeof(*newargv
));
1003 newargv
[nargs
- 1] = NULL
;
1006 * If we're running the template in a mapped userns, then
1007 * we prepend the template command with:
1008 * lxc-usernsexec <-m map1> ... <-m mapn> --
1009 * and we append "--mapped-uid x", where x is the mapped uid
1012 if (!lxc_list_empty(&conf
->id_map
)) {
1016 char **n2
= malloc(n2args
* sizeof(*n2
));
1017 struct lxc_list
*it
;
1021 SYSERROR("out of memory");
1025 tpath
= "lxc-usernsexec";
1026 n2
[0] = "lxc-usernsexec";
1027 lxc_list_for_each(it
, &conf
->id_map
) {
1030 n2
= realloc(n2
, n2args
* sizeof(char *));
1033 n2
[n2args
-2] = "-m";
1034 n2
[n2args
-1] = malloc(200);
1037 ret
= snprintf(n2
[n2args
-1], 200, "%c:%lu:%lu:%lu",
1038 map
->idtype
== ID_TYPE_UID
? 'u' : 'g',
1039 map
->nsid
, map
->hostid
, map
->range
);
1040 if (ret
< 0 || ret
>= 200)
1043 int hostid_mapped
= mapped_hostid(geteuid(), conf
, ID_TYPE_UID
);
1044 int extraargs
= hostid_mapped
>= 0 ? 1 : 3;
1045 n2
= realloc(n2
, (nargs
+ n2args
+ extraargs
) * sizeof(char *));
1048 if (hostid_mapped
< 0) {
1049 hostid_mapped
= find_unmapped_nsuid(conf
, ID_TYPE_UID
);
1050 n2
[n2args
++] = "-m";
1051 if (hostid_mapped
< 0) {
1052 ERROR("Could not find free uid to map");
1055 n2
[n2args
++] = malloc(200);
1056 if (!n2
[n2args
-1]) {
1057 SYSERROR("out of memory");
1060 ret
= snprintf(n2
[n2args
-1], 200, "u:%d:%d:1",
1061 hostid_mapped
, geteuid());
1062 if (ret
< 0 || ret
>= 200) {
1063 ERROR("string too long");
1067 int hostgid_mapped
= mapped_hostid(getegid(), conf
, ID_TYPE_GID
);
1068 extraargs
= hostgid_mapped
>= 0 ? 1 : 3;
1069 n2
= realloc(n2
, (nargs
+ n2args
+ extraargs
) * sizeof(char *));
1072 if (hostgid_mapped
< 0) {
1073 hostgid_mapped
= find_unmapped_nsuid(conf
, ID_TYPE_GID
);
1074 n2
[n2args
++] = "-m";
1075 if (hostgid_mapped
< 0) {
1076 ERROR("Could not find free uid to map");
1079 n2
[n2args
++] = malloc(200);
1080 if (!n2
[n2args
-1]) {
1081 SYSERROR("out of memory");
1084 ret
= snprintf(n2
[n2args
-1], 200, "g:%d:%d:1",
1085 hostgid_mapped
, getegid());
1086 if (ret
< 0 || ret
>= 200) {
1087 ERROR("string too long");
1091 n2
[n2args
++] = "--";
1092 for (i
= 0; i
< nargs
; i
++)
1093 n2
[i
+ n2args
] = newargv
[i
];
1095 // Finally add "--mapped-uid $uid" to tell template what to chown
1098 n2
= realloc(n2
, n2args
* sizeof(char *));
1100 SYSERROR("out of memory");
1103 // note n2[n2args-1] is NULL
1104 n2
[n2args
-5] = "--mapped-uid";
1105 snprintf(txtuid
, 20, "%d", hostid_mapped
);
1106 n2
[n2args
-4] = txtuid
;
1107 n2
[n2args
-3] = "--mapped-gid";
1108 snprintf(txtgid
, 20, "%d", hostgid_mapped
);
1109 n2
[n2args
-2] = txtgid
;
1110 n2
[n2args
-1] = NULL
;
1115 execvp(tpath
, newargv
);
1116 SYSERROR("failed to execute template %s", tpath
);
1120 if (wait_for_pid(pid
) != 0) {
1121 ERROR("container creation template for %s failed", c
->name
);
1128 static bool prepend_lxc_header(char *path
, const char *t
, char *const argv
[])
1136 unsigned char md_value
[SHA_DIGEST_LENGTH
];
1140 f
= fopen(path
, "r");
1144 if (fseek(f
, 0, SEEK_END
) < 0)
1146 if ((flen
= ftell(f
)) < 0)
1148 if (fseek(f
, 0, SEEK_SET
) < 0)
1150 if ((contents
= malloc(flen
+ 1)) == NULL
)
1152 if (fread(contents
, 1, flen
, f
) != flen
)
1153 goto out_free_contents
;
1155 contents
[flen
] = '\0';
1159 goto out_free_contents
;
1162 tpath
= get_template_path(t
);
1164 ERROR("bad template: %s", t
);
1165 goto out_free_contents
;
1168 ret
= sha1sum_file(tpath
, md_value
);
1170 ERROR("Error getting sha1sum of %s", tpath
);
1172 goto out_free_contents
;
1177 f
= fopen(path
, "w");
1179 SYSERROR("reopening config for writing");
1183 fprintf(f
, "# Template used to create this container: %s\n", t
);
1185 fprintf(f
, "# Parameters passed to the template:");
1187 fprintf(f
, " %s", *argv
);
1193 fprintf(f
, "# Template script checksum (SHA-1): ");
1194 for (i
=0; i
<SHA_DIGEST_LENGTH
; i
++)
1195 fprintf(f
, "%02x", md_value
[i
]);
1198 fprintf(f
, "# For additional config options, please look at lxc.container.conf(5)\n");
1199 if (fwrite(contents
, 1, flen
, f
) != flen
) {
1200 SYSERROR("Writing original contents");
1216 SYSERROR("Error prepending header");
1222 static void lxcapi_clear_config(struct lxc_container
*c
)
1226 lxc_conf_free(c
->lxc_conf
);
1232 static bool lxcapi_destroy(struct lxc_container
*c
);
1233 static bool container_destroy(struct lxc_container
*c
);
1234 static bool get_snappath_dir(struct lxc_container
*c
, char *snappath
);
1237 * create a container with the given parameters.
1238 * @c: container to be created. It has the lxcpath, name, and a starting
1239 * configuration already set
1240 * @t: the template to execute to instantiate the root filesystem and
1241 * adjust the configuration.
1242 * @bdevtype: backing store type to use. If NULL, dir will be used.
1243 * @specs: additional parameters for the backing store, i.e. LVM vg to
1246 * @argv: the arguments to pass to the template, terminated by NULL. If no
1247 * arguments, you can just pass NULL.
1249 static bool lxcapi_create(struct lxc_container
*c
, const char *t
,
1250 const char *bdevtype
, struct bdev_specs
*specs
, int flags
,
1262 tpath
= get_template_path(t
);
1264 ERROR("bad template: %s", t
);
1270 * If a template is passed in, and the rootfs already is defined in
1271 * the container config and exists, then * caller is trying to create
1272 * an existing container. Return an error, but do NOT delete the
1275 if (lxcapi_is_defined(c
) && c
->lxc_conf
&& c
->lxc_conf
->rootfs
.path
&&
1276 access(c
->lxc_conf
->rootfs
.path
, F_OK
) == 0 && tpath
) {
1277 ERROR("Container %s:%s already exists", c
->config_path
, c
->name
);
1282 if (!c
->load_config(c
, lxc_global_config_value("lxc.default_config"))) {
1283 ERROR("Error loading default configuration file %s", lxc_global_config_value("lxc.default_config"));
1288 if (!create_container_dir(c
))
1292 * either template or rootfs.path should be set.
1293 * if both template and rootfs.path are set, template is setup as rootfs.path.
1294 * container is already created if we have a config and rootfs.path is accessible
1296 if (!c
->lxc_conf
->rootfs
.path
&& !tpath
)
1297 /* no template passed in and rootfs does not exist: error */
1299 if (c
->lxc_conf
->rootfs
.path
&& access(c
->lxc_conf
->rootfs
.path
, F_OK
) != 0)
1300 /* rootfs passed into configuration, but does not exist: error */
1302 if (lxcapi_is_defined(c
) && c
->lxc_conf
->rootfs
.path
&& !tpath
) {
1303 /* Rootfs already existed, user just wanted to save the
1304 * loaded configuration */
1309 /* Mark that this container is being created */
1310 if ((partial_fd
= create_partial(c
)) < 0)
1313 /* no need to get disk lock bc we have the partial locked */
1316 * Create the backing store
1317 * Note we can't do this in the same task as we use to execute the
1318 * template because of the way zfs works.
1319 * After you 'zfs create', zfs mounts the fs only in the initial
1324 SYSERROR("failed to fork task for container creation template");
1328 if (pid
== 0) { // child
1329 struct bdev
*bdev
= NULL
;
1331 if (!(bdev
= do_bdev_create(c
, bdevtype
, specs
))) {
1332 ERROR("Error creating backing store type %s for %s",
1333 bdevtype
? bdevtype
: "(none)", c
->name
);
1337 /* save config file again to store the new rootfs location */
1338 if (!c
->save_config(c
, NULL
)) {
1339 ERROR("failed to save starting configuration for %s", c
->name
);
1340 // parent task won't see bdev in config so we delete it
1341 bdev
->ops
->umount(bdev
);
1342 bdev
->ops
->destroy(bdev
);
1347 if (wait_for_pid(pid
) != 0)
1350 /* reload config to get the rootfs */
1351 lxc_conf_free(c
->lxc_conf
);
1353 if (!load_config_locked(c
, c
->configfile
))
1356 if (!create_run_template(c
, tpath
, !!(flags
& LXC_CREATE_QUIET
), argv
))
1359 // now clear out the lxc_conf we have, reload from the created
1361 lxcapi_clear_config(c
);
1364 if (!prepend_lxc_header(c
->configfile
, tpath
, argv
)) {
1365 ERROR("Error prepending header to configuration file");
1369 ret
= load_config_locked(c
, c
->configfile
);
1372 if (partial_fd
>= 0)
1373 remove_partial(c
, partial_fd
);
1376 container_destroy(c
);
1383 static bool lxcapi_reboot(struct lxc_container
*c
)
1389 if (!c
->is_running(c
))
1391 pid
= c
->init_pid(c
);
1394 if (kill(pid
, SIGINT
) < 0)
1400 static bool lxcapi_shutdown(struct lxc_container
*c
, int timeout
)
1404 int haltsignal
= SIGPWR
;
1409 if (!c
->is_running(c
))
1411 pid
= c
->init_pid(c
);
1414 if (c
->lxc_conf
&& c
->lxc_conf
->haltsignal
)
1415 haltsignal
= c
->lxc_conf
->haltsignal
;
1416 kill(pid
, haltsignal
);
1417 retv
= c
->wait(c
, "STOPPED", timeout
);
1421 static bool lxcapi_createl(struct lxc_container
*c
, const char *t
,
1422 const char *bdevtype
, struct bdev_specs
*specs
, int flags
, ...)
1432 * since we're going to wait for create to finish, I don't think we
1433 * need to get a copy of the arguments.
1435 va_start(ap
, flags
);
1436 args
= lxc_va_arg_list_to_argv(ap
, 0, 0);
1439 ERROR("Memory allocation error.");
1443 bret
= c
->create(c
, t
, bdevtype
, specs
, flags
, args
);
1450 static void do_clear_unexp_config_line(struct lxc_conf
*conf
, const char *key
)
1452 if (strcmp(key
, "lxc.cgroup") == 0)
1453 clear_unexp_config_line(conf
, key
, true);
1454 else if (strcmp(key
, "lxc.network") == 0)
1455 clear_unexp_config_line(conf
, key
, true);
1456 else if (strcmp(key
, "lxc.hook") == 0)
1457 clear_unexp_config_line(conf
, key
, true);
1459 clear_unexp_config_line(conf
, key
, false);
1460 if (!do_append_unexp_config_line(conf
, key
, ""))
1461 WARN("Error clearing configuration for %s", key
);
1464 static bool lxcapi_clear_config_item(struct lxc_container
*c
, const char *key
)
1468 if (!c
|| !c
->lxc_conf
)
1470 if (container_mem_lock(c
))
1472 ret
= lxc_clear_config_item(c
->lxc_conf
, key
);
1474 do_clear_unexp_config_line(c
->lxc_conf
, key
);
1475 container_mem_unlock(c
);
1479 static inline bool enter_to_ns(struct lxc_container
*c
) {
1480 int netns
, userns
, ret
= 0, init_pid
= 0;;
1481 char new_netns_path
[MAXPATHLEN
];
1482 char new_userns_path
[MAXPATHLEN
];
1484 if (!c
->is_running(c
))
1487 init_pid
= c
->init_pid(c
);
1489 /* Switch to new userns */
1490 if ((geteuid() != 0 || (c
->lxc_conf
&& !lxc_list_empty(&c
->lxc_conf
->id_map
))) && access("/proc/self/ns/user", F_OK
) == 0) {
1491 ret
= snprintf(new_userns_path
, MAXPATHLEN
, "/proc/%d/ns/user", init_pid
);
1492 if (ret
< 0 || ret
>= MAXPATHLEN
)
1495 userns
= open(new_userns_path
, O_RDONLY
);
1497 SYSERROR("failed to open %s", new_userns_path
);
1501 if (setns(userns
, CLONE_NEWUSER
)) {
1502 SYSERROR("failed to setns for CLONE_NEWUSER");
1509 /* Switch to new netns */
1510 ret
= snprintf(new_netns_path
, MAXPATHLEN
, "/proc/%d/ns/net", init_pid
);
1511 if (ret
< 0 || ret
>= MAXPATHLEN
)
1514 netns
= open(new_netns_path
, O_RDONLY
);
1516 SYSERROR("failed to open %s", new_netns_path
);
1520 if (setns(netns
, CLONE_NEWNET
)) {
1521 SYSERROR("failed to setns for CLONE_NEWNET");
1531 // used by qsort and bsearch functions for comparing names
1532 static inline int string_cmp(char **first
, char **second
)
1534 return strcmp(*first
, *second
);
1537 // used by qsort and bsearch functions for comparing container names
1538 static inline int container_cmp(struct lxc_container
**first
, struct lxc_container
**second
)
1540 return strcmp((*first
)->name
, (*second
)->name
);
1543 static bool add_to_array(char ***names
, char *cname
, int pos
)
1545 char **newnames
= realloc(*names
, (pos
+1) * sizeof(char *));
1547 ERROR("Out of memory");
1552 newnames
[pos
] = strdup(cname
);
1556 // sort the arrray as we will use binary search on it
1557 qsort(newnames
, pos
+ 1, sizeof(char *), (int (*)(const void *,const void *))string_cmp
);
1562 static bool add_to_clist(struct lxc_container
***list
, struct lxc_container
*c
, int pos
, bool sort
)
1564 struct lxc_container
**newlist
= realloc(*list
, (pos
+1) * sizeof(struct lxc_container
*));
1566 ERROR("Out of memory");
1573 // sort the arrray as we will use binary search on it
1575 qsort(newlist
, pos
+ 1, sizeof(struct lxc_container
*), (int (*)(const void *,const void *))container_cmp
);
1580 static char** get_from_array(char ***names
, char *cname
, int size
)
1582 return (char **)bsearch(&cname
, *names
, size
, sizeof(char *), (int (*)(const void *, const void *))string_cmp
);
1586 static bool array_contains(char ***names
, char *cname
, int size
) {
1587 if(get_from_array(names
, cname
, size
) != NULL
)
1592 static bool remove_from_array(char ***names
, char *cname
, int size
)
1594 char **result
= get_from_array(names
, cname
, size
);
1595 if (result
!= NULL
) {
1602 static char** lxcapi_get_interfaces(struct lxc_container
*c
)
1605 int i
, count
= 0, pipefd
[2];
1606 char **interfaces
= NULL
;
1607 char interface
[IFNAMSIZ
];
1609 if(pipe(pipefd
) < 0) {
1610 SYSERROR("pipe failed");
1616 SYSERROR("failed to fork task to get interfaces information");
1622 if (pid
== 0) { // child
1623 int ret
= 1, nbytes
;
1624 struct ifaddrs
*interfaceArray
= NULL
, *tempIfAddr
= NULL
;
1626 /* close the read-end of the pipe */
1629 if (!enter_to_ns(c
)) {
1630 SYSERROR("failed to enter namespace");
1634 /* Grab the list of interfaces */
1635 if (getifaddrs(&interfaceArray
)) {
1636 SYSERROR("failed to get interfaces list");
1640 /* Iterate through the interfaces */
1641 for (tempIfAddr
= interfaceArray
; tempIfAddr
!= NULL
; tempIfAddr
= tempIfAddr
->ifa_next
) {
1642 nbytes
= write(pipefd
[1], tempIfAddr
->ifa_name
, IFNAMSIZ
);
1644 ERROR("write failed");
1653 freeifaddrs(interfaceArray
);
1655 /* close the write-end of the pipe, thus sending EOF to the reader */
1660 /* close the write-end of the pipe */
1663 while (read(pipefd
[0], &interface
, IFNAMSIZ
) == IFNAMSIZ
) {
1664 if (array_contains(&interfaces
, interface
, count
))
1667 if(!add_to_array(&interfaces
, interface
, count
))
1668 ERROR("PARENT: add_to_array failed");
1672 if (wait_for_pid(pid
) != 0) {
1673 for(i
=0;i
<count
;i
++)
1674 free(interfaces
[i
]);
1679 /* close the read-end of the pipe */
1682 /* Append NULL to the array */
1684 interfaces
= (char **)lxc_append_null_to_array((void **)interfaces
, count
);
1689 static char** lxcapi_get_ips(struct lxc_container
*c
, const char* interface
, const char* family
, int scope
)
1692 int i
, count
= 0, pipefd
[2];
1693 char **addresses
= NULL
;
1694 char address
[INET6_ADDRSTRLEN
];
1696 if(pipe(pipefd
) < 0) {
1697 SYSERROR("pipe failed");
1703 SYSERROR("failed to fork task to get container ips");
1709 if (pid
== 0) { // child
1710 int ret
= 1, nbytes
;
1711 struct ifaddrs
*interfaceArray
= NULL
, *tempIfAddr
= NULL
;
1712 char addressOutputBuffer
[INET6_ADDRSTRLEN
];
1713 void *tempAddrPtr
= NULL
;
1714 char *address
= NULL
;
1716 /* close the read-end of the pipe */
1719 if (!enter_to_ns(c
)) {
1720 SYSERROR("failed to enter namespace");
1724 /* Grab the list of interfaces */
1725 if (getifaddrs(&interfaceArray
)) {
1726 SYSERROR("failed to get interfaces list");
1730 /* Iterate through the interfaces */
1731 for (tempIfAddr
= interfaceArray
; tempIfAddr
!= NULL
; tempIfAddr
= tempIfAddr
->ifa_next
) {
1732 if (tempIfAddr
->ifa_addr
== NULL
)
1735 if(tempIfAddr
->ifa_addr
->sa_family
== AF_INET
) {
1736 if (family
&& strcmp(family
, "inet"))
1738 tempAddrPtr
= &((struct sockaddr_in
*)tempIfAddr
->ifa_addr
)->sin_addr
;
1741 if (family
&& strcmp(family
, "inet6"))
1744 if (((struct sockaddr_in6
*)tempIfAddr
->ifa_addr
)->sin6_scope_id
!= scope
)
1747 tempAddrPtr
= &((struct sockaddr_in6
*)tempIfAddr
->ifa_addr
)->sin6_addr
;
1750 if (interface
&& strcmp(interface
, tempIfAddr
->ifa_name
))
1752 else if (!interface
&& strcmp("lo", tempIfAddr
->ifa_name
) == 0)
1755 address
= (char *)inet_ntop(tempIfAddr
->ifa_addr
->sa_family
,
1757 addressOutputBuffer
,
1758 sizeof(addressOutputBuffer
));
1762 nbytes
= write(pipefd
[1], address
, INET6_ADDRSTRLEN
);
1764 ERROR("write failed");
1773 freeifaddrs(interfaceArray
);
1775 /* close the write-end of the pipe, thus sending EOF to the reader */
1780 /* close the write-end of the pipe */
1783 while (read(pipefd
[0], &address
, INET6_ADDRSTRLEN
) == INET6_ADDRSTRLEN
) {
1784 if(!add_to_array(&addresses
, address
, count
))
1785 ERROR("PARENT: add_to_array failed");
1789 if (wait_for_pid(pid
) != 0) {
1790 for(i
=0;i
<count
;i
++)
1796 /* close the read-end of the pipe */
1799 /* Append NULL to the array */
1801 addresses
= (char **)lxc_append_null_to_array((void **)addresses
, count
);
1806 static int lxcapi_get_config_item(struct lxc_container
*c
, const char *key
, char *retv
, int inlen
)
1810 if (!c
|| !c
->lxc_conf
)
1812 if (container_mem_lock(c
))
1814 ret
= lxc_get_config_item(c
->lxc_conf
, key
, retv
, inlen
);
1815 container_mem_unlock(c
);
1819 static char* lxcapi_get_running_config_item(struct lxc_container
*c
, const char *key
)
1823 if (!c
|| !c
->lxc_conf
)
1825 if (container_mem_lock(c
))
1827 ret
= lxc_cmd_get_config_item(c
->name
, key
, c
->get_config_path(c
));
1828 container_mem_unlock(c
);
1832 static int lxcapi_get_keys(struct lxc_container
*c
, const char *key
, char *retv
, int inlen
)
1835 return lxc_listconfigs(retv
, inlen
);
1837 * Support 'lxc.network.<idx>', i.e. 'lxc.network.0'
1838 * This is an intelligent result to show which keys are valid given
1839 * the type of nic it is
1841 if (!c
|| !c
->lxc_conf
)
1843 if (container_mem_lock(c
))
1846 if (strncmp(key
, "lxc.network.", 12) == 0)
1847 ret
= lxc_list_nicconfigs(c
->lxc_conf
, key
, retv
, inlen
);
1848 container_mem_unlock(c
);
1852 static bool lxcapi_save_config(struct lxc_container
*c
, const char *alt_file
)
1855 bool ret
= false, need_disklock
= false;
1859 alt_file
= c
->configfile
;
1861 return false; // should we write to stdout if no file is specified?
1863 // If we haven't yet loaded a config, load the stock config
1865 if (!c
->load_config(c
, lxc_global_config_value("lxc.default_config"))) {
1866 ERROR("Error loading default configuration file %s while saving %s", lxc_global_config_value("lxc.default_config"), c
->name
);
1871 if (!create_container_dir(c
))
1875 * If we're writing to the container's config file, take the
1876 * disk lock. Otherwise just take the memlock to protect the
1877 * struct lxc_container while we're traversing it.
1879 if (strcmp(c
->configfile
, alt_file
) == 0)
1880 need_disklock
= true;
1883 lret
= container_disk_lock(c
);
1885 lret
= container_mem_lock(c
);
1890 fout
= fopen(alt_file
, "w");
1893 write_config(fout
, c
->lxc_conf
);
1899 container_disk_unlock(c
);
1901 container_mem_unlock(c
);
1905 static bool mod_rdep(struct lxc_container
*c
, bool inc
)
1907 char path
[MAXPATHLEN
];
1912 if (container_disk_lock(c
))
1914 ret
= snprintf(path
, MAXPATHLEN
, "%s/%s/lxc_snapshots", c
->config_path
,
1916 if (ret
< 0 || ret
> MAXPATHLEN
)
1918 f
= fopen(path
, "r");
1920 ret
= fscanf(f
, "%d", &v
);
1923 ERROR("Corrupted file %s", path
);
1928 f
= fopen(path
, "w");
1931 if (fprintf(f
, "%d\n", v
) < 0) {
1932 ERROR("Error writing new snapshots value");
1938 SYSERROR("Error writing to or closing snapshots file");
1945 container_disk_unlock(c
);
1949 static void strip_newline(char *p
)
1951 size_t len
= strlen(p
);
1954 if (p
[len
-1] == '\n')
1958 static void mod_all_rdeps(struct lxc_container
*c
, bool inc
)
1960 struct lxc_container
*p
;
1961 char *lxcpath
= NULL
, *lxcname
= NULL
, path
[MAXPATHLEN
];
1962 size_t pathlen
= 0, namelen
= 0;
1966 ret
= snprintf(path
, MAXPATHLEN
, "%s/%s/lxc_rdepends",
1967 c
->config_path
, c
->name
);
1968 if (ret
< 0 || ret
>= MAXPATHLEN
) {
1969 ERROR("Path name too long");
1972 f
= fopen(path
, "r");
1975 while (getline(&lxcpath
, &pathlen
, f
) != -1) {
1976 if (getline(&lxcname
, &namelen
, f
) == -1) {
1977 ERROR("badly formatted file %s", path
);
1980 strip_newline(lxcpath
);
1981 strip_newline(lxcname
);
1982 if ((p
= lxc_container_new(lxcname
, lxcpath
)) == NULL
) {
1983 ERROR("Unable to find dependent container %s:%s",
1987 if (!mod_rdep(p
, inc
))
1988 ERROR("Failed to increase numsnapshots for %s:%s",
1990 lxc_container_put(p
);
1993 if (lxcpath
) free(lxcpath
);
1994 if (lxcname
) free(lxcname
);
1998 static bool has_fs_snapshots(struct lxc_container
*c
)
2000 char path
[MAXPATHLEN
];
2005 ret
= snprintf(path
, MAXPATHLEN
, "%s/%s/lxc_snapshots", c
->config_path
,
2007 if (ret
< 0 || ret
> MAXPATHLEN
)
2009 f
= fopen(path
, "r");
2012 ret
= fscanf(f
, "%d", &v
);
2022 static bool has_snapshots(struct lxc_container
*c
)
2024 char path
[MAXPATHLEN
];
2025 struct dirent dirent
, *direntp
;
2029 if (!get_snappath_dir(c
, path
))
2031 dir
= opendir(path
);
2034 while (!readdir_r(dir
, &dirent
, &direntp
)) {
2038 if (!strcmp(direntp
->d_name
, "."))
2041 if (!strcmp(direntp
->d_name
, ".."))
2050 static int lxc_rmdir_onedev_wrapper(void *data
)
2052 char *arg
= (char *) data
;
2053 return lxc_rmdir_onedev(arg
, "snaps");
2056 static int do_bdev_destroy(struct lxc_conf
*conf
)
2061 r
= bdev_init(conf
, conf
->rootfs
.path
, conf
->rootfs
.mount
, NULL
);
2065 if (r
->ops
->destroy(r
) < 0)
2071 static int bdev_destroy_wrapper(void *data
)
2073 struct lxc_conf
*conf
= data
;
2075 if (setgid(0) < 0) {
2076 ERROR("Failed to setgid to 0");
2079 if (setgroups(0, NULL
) < 0)
2080 WARN("Failed to clear groups");
2081 if (setuid(0) < 0) {
2082 ERROR("Failed to setuid to 0");
2085 return do_bdev_destroy(conf
);
2088 static bool container_destroy(struct lxc_container
*c
)
2093 if (!c
|| !lxcapi_is_defined(c
))
2096 if (container_disk_lock(c
))
2099 if (!is_stopped(c
)) {
2100 // we should queue some sort of error - in c->error_string?
2101 ERROR("container %s is not stopped", c
->name
);
2105 if (c
->lxc_conf
&& c
->lxc_conf
->rootfs
.path
&& c
->lxc_conf
->rootfs
.mount
) {
2107 ret
= userns_exec_1(c
->lxc_conf
, bdev_destroy_wrapper
, c
->lxc_conf
);
2109 ret
= do_bdev_destroy(c
->lxc_conf
);
2111 ERROR("Error destroying rootfs for %s", c
->name
);
2116 mod_all_rdeps(c
, false);
2118 const char *p1
= lxcapi_get_config_path(c
);
2119 char *path
= alloca(strlen(p1
) + strlen(c
->name
) + 2);
2120 sprintf(path
, "%s/%s", p1
, c
->name
);
2122 ret
= userns_exec_1(c
->lxc_conf
, lxc_rmdir_onedev_wrapper
, path
);
2124 ret
= lxc_rmdir_onedev(path
, "snaps");
2126 ERROR("Error destroying container directory for %s", c
->name
);
2132 container_disk_unlock(c
);
2136 static bool lxcapi_destroy(struct lxc_container
*c
)
2138 if (!c
|| !lxcapi_is_defined(c
))
2140 if (has_snapshots(c
)) {
2141 ERROR("Container %s has snapshots; not removing", c
->name
);
2145 if (has_fs_snapshots(c
)) {
2146 ERROR("container %s has snapshots on its rootfs", c
->name
);
2150 return container_destroy(c
);
2153 static bool lxcapi_snapshot_destroy_all(struct lxc_container
*c
);
2155 static bool lxcapi_destroy_with_snapshots(struct lxc_container
*c
)
2157 if (!c
|| !lxcapi_is_defined(c
))
2159 if (!lxcapi_snapshot_destroy_all(c
)) {
2160 ERROR("Error deleting all snapshots");
2163 return lxcapi_destroy(c
);
2166 static bool set_config_item_locked(struct lxc_container
*c
, const char *key
, const char *v
)
2168 struct lxc_config_t
*config
;
2171 c
->lxc_conf
= lxc_conf_init();
2174 config
= lxc_getconfig(key
);
2177 if (config
->cb(key
, v
, c
->lxc_conf
) != 0)
2179 return do_append_unexp_config_line(c
->lxc_conf
, key
, v
);
2182 static bool lxcapi_set_config_item(struct lxc_container
*c
, const char *key
, const char *v
)
2189 if (container_mem_lock(c
))
2192 b
= set_config_item_locked(c
, key
, v
);
2194 container_mem_unlock(c
);
2198 static char *lxcapi_config_file_name(struct lxc_container
*c
)
2200 if (!c
|| !c
->configfile
)
2202 return strdup(c
->configfile
);
2205 static const char *lxcapi_get_config_path(struct lxc_container
*c
)
2207 if (!c
|| !c
->config_path
)
2209 return (const char *)(c
->config_path
);
2214 * Just recalculate the c->configfile based on the
2215 * c->config_path, which must be set.
2216 * The lxc_container must be locked or not yet public.
2218 static bool set_config_filename(struct lxc_container
*c
)
2223 if (!c
->config_path
)
2226 /* $lxc_path + "/" + c->name + "/" + "config" + '\0' */
2227 len
= strlen(c
->config_path
) + strlen(c
->name
) + strlen("config") + 3;
2228 newpath
= malloc(len
);
2232 ret
= snprintf(newpath
, len
, "%s/%s/config", c
->config_path
, c
->name
);
2233 if (ret
< 0 || ret
>= len
) {
2234 fprintf(stderr
, "Error printing out config file name\n");
2240 free(c
->configfile
);
2241 c
->configfile
= newpath
;
2246 static bool lxcapi_set_config_path(struct lxc_container
*c
, const char *path
)
2250 char *oldpath
= NULL
;
2255 if (container_mem_lock(c
))
2260 ERROR("Out of memory setting new lxc path");
2266 oldpath
= c
->config_path
;
2269 /* Since we've changed the config path, we have to change the
2270 * config file name too */
2271 if (!set_config_filename(c
)) {
2272 ERROR("Out of memory setting new config filename");
2274 free(c
->config_path
);
2275 c
->config_path
= oldpath
;
2281 container_mem_unlock(c
);
2286 static bool lxcapi_set_cgroup_item(struct lxc_container
*c
, const char *subsys
, const char *value
)
2296 if (container_disk_lock(c
))
2299 ret
= lxc_cgroup_set(subsys
, value
, c
->name
, c
->config_path
);
2301 container_disk_unlock(c
);
2305 static int lxcapi_get_cgroup_item(struct lxc_container
*c
, const char *subsys
, char *retv
, int inlen
)
2315 if (container_disk_lock(c
))
2318 ret
= lxc_cgroup_get(subsys
, retv
, inlen
, c
->name
, c
->config_path
);
2320 container_disk_unlock(c
);
2324 const char *lxc_get_global_config_item(const char *key
)
2326 return lxc_global_config_value(key
);
2329 const char *lxc_get_version(void)
2334 static int copy_file(const char *old
, const char *new)
2341 if (file_exists(new)) {
2342 ERROR("copy destination %s exists", new);
2345 ret
= stat(old
, &sbuf
);
2347 INFO("Error stat'ing %s", old
);
2351 in
= open(old
, O_RDONLY
);
2353 SYSERROR("Error opening original file %s", old
);
2356 out
= open(new, O_CREAT
| O_EXCL
| O_WRONLY
, 0644);
2358 SYSERROR("Error opening new file %s", new);
2364 len
= read(in
, buf
, 8096);
2366 SYSERROR("Error reading old file %s", old
);
2371 ret
= write(out
, buf
, len
);
2372 if (ret
< len
) { // should we retry?
2373 SYSERROR("Error: write to new file %s was interrupted", new);
2380 // we set mode, but not owner/group
2381 ret
= chmod(new, sbuf
.st_mode
);
2383 SYSERROR("Error setting mode on %s", new);
2395 static int copyhooks(struct lxc_container
*oldc
, struct lxc_container
*c
)
2398 struct lxc_list
*it
;
2401 len
= strlen(oldc
->config_path
) + strlen(oldc
->name
) + 3;
2402 cpath
= alloca(len
);
2403 ret
= snprintf(cpath
, len
, "%s/%s/", oldc
->config_path
, oldc
->name
);
2404 if (ret
< 0 || ret
>= len
)
2407 for (i
=0; i
<NUM_LXC_HOOKS
; i
++) {
2408 lxc_list_for_each(it
, &c
->lxc_conf
->hooks
[i
]) {
2409 char *hookname
= it
->elem
;
2410 char *fname
= strrchr(hookname
, '/');
2411 char tmppath
[MAXPATHLEN
];
2412 if (!fname
) // relative path - we don't support, but maybe we should
2414 if (strncmp(hookname
, cpath
, len
- 1) != 0) {
2415 // this hook is public - ignore
2418 // copy the script, and change the entry in confile
2419 ret
= snprintf(tmppath
, MAXPATHLEN
, "%s/%s/%s",
2420 c
->config_path
, c
->name
, fname
+1);
2421 if (ret
< 0 || ret
>= MAXPATHLEN
)
2423 ret
= copy_file(it
->elem
, tmppath
);
2427 it
->elem
= strdup(tmppath
);
2429 ERROR("out of memory copying hook path");
2435 if (!clone_update_unexp_hooks(c
->lxc_conf
, oldc
->config_path
,
2436 c
->config_path
, oldc
->name
, c
->name
)) {
2437 ERROR("Error saving new hooks in clone");
2440 c
->save_config(c
, NULL
);
2445 static int copy_fstab(struct lxc_container
*oldc
, struct lxc_container
*c
)
2447 char newpath
[MAXPATHLEN
];
2448 char *oldpath
= oldc
->lxc_conf
->fstab
;
2454 clear_unexp_config_line(c
->lxc_conf
, "lxc.mount", false);
2456 char *p
= strrchr(oldpath
, '/');
2459 ret
= snprintf(newpath
, MAXPATHLEN
, "%s/%s%s",
2460 c
->config_path
, c
->name
, p
);
2461 if (ret
< 0 || ret
>= MAXPATHLEN
) {
2462 ERROR("error printing new path for %s", oldpath
);
2465 if (file_exists(newpath
)) {
2466 ERROR("error: fstab file %s exists", newpath
);
2470 if (copy_file(oldpath
, newpath
) < 0) {
2471 ERROR("error: copying %s to %s", oldpath
, newpath
);
2474 free(c
->lxc_conf
->fstab
);
2475 c
->lxc_conf
->fstab
= strdup(newpath
);
2476 if (!c
->lxc_conf
->fstab
) {
2477 ERROR("error: allocating pathname");
2480 if (!do_append_unexp_config_line(c
->lxc_conf
, "lxc.mount", newpath
)) {
2481 ERROR("error saving new lxctab");
2488 static void copy_rdepends(struct lxc_container
*c
, struct lxc_container
*c0
)
2490 char path0
[MAXPATHLEN
], path1
[MAXPATHLEN
];
2493 ret
= snprintf(path0
, MAXPATHLEN
, "%s/%s/lxc_rdepends", c0
->config_path
,
2495 if (ret
< 0 || ret
>= MAXPATHLEN
) {
2496 WARN("Error copying reverse dependencies");
2499 ret
= snprintf(path1
, MAXPATHLEN
, "%s/%s/lxc_rdepends", c
->config_path
,
2501 if (ret
< 0 || ret
>= MAXPATHLEN
) {
2502 WARN("Error copying reverse dependencies");
2505 if (copy_file(path0
, path1
) < 0) {
2506 INFO("Error copying reverse dependencies");
2511 static bool add_rdepends(struct lxc_container
*c
, struct lxc_container
*c0
)
2514 char path
[MAXPATHLEN
];
2518 ret
= snprintf(path
, MAXPATHLEN
, "%s/%s/lxc_rdepends", c
->config_path
,
2520 if (ret
< 0 || ret
>= MAXPATHLEN
)
2522 f
= fopen(path
, "a");
2526 // if anything goes wrong, just return an error
2527 if (fprintf(f
, "%s\n%s\n", c0
->config_path
, c0
->name
) < 0)
2534 static int copy_storage(struct lxc_container
*c0
, struct lxc_container
*c
,
2535 const char *newtype
, int flags
, const char *bdevdata
, uint64_t newsize
)
2540 bdev
= bdev_copy(c0
, c
->name
, c
->config_path
, newtype
, flags
,
2541 bdevdata
, newsize
, &need_rdep
);
2543 ERROR("Error copying storage");
2546 free(c
->lxc_conf
->rootfs
.path
);
2547 c
->lxc_conf
->rootfs
.path
= strdup(bdev
->src
);
2549 if (!c
->lxc_conf
->rootfs
.path
) {
2550 ERROR("Out of memory while setting storage path");
2553 // We will simply append a new lxc.rootfs entry to the unexpanded config
2554 clear_unexp_config_line(c
->lxc_conf
, "lxc.rootfs", false);
2555 if (!do_append_unexp_config_line(c
->lxc_conf
, "lxc.rootfs", c
->lxc_conf
->rootfs
.path
)) {
2556 ERROR("Error saving new rootfs to cloend config");
2559 if (flags
& LXC_CLONE_SNAPSHOT
)
2560 copy_rdepends(c
, c0
);
2562 if (!add_rdepends(c
, c0
))
2563 WARN("Error adding reverse dependency from %s to %s",
2567 mod_all_rdeps(c
, true);
2572 struct clone_update_data
{
2573 struct lxc_container
*c0
;
2574 struct lxc_container
*c1
;
2579 static int clone_update_rootfs(struct clone_update_data
*data
)
2581 struct lxc_container
*c0
= data
->c0
;
2582 struct lxc_container
*c
= data
->c1
;
2583 int flags
= data
->flags
;
2584 char **hookargs
= data
->hookargs
;
2586 char path
[MAXPATHLEN
];
2589 struct lxc_conf
*conf
= c
->lxc_conf
;
2591 /* update hostname in rootfs */
2592 /* we're going to mount, so run in a clean namespace to simplify cleanup */
2594 if (setgid(0) < 0) {
2595 ERROR("Failed to setgid to 0");
2598 if (setuid(0) < 0) {
2599 ERROR("Failed to setuid to 0");
2602 if (setgroups(0, NULL
) < 0)
2603 WARN("Failed to clear groups");
2605 if (unshare(CLONE_NEWNS
) < 0)
2607 bdev
= bdev_init(c
->lxc_conf
, c
->lxc_conf
->rootfs
.path
, c
->lxc_conf
->rootfs
.mount
, NULL
);
2610 if (strcmp(bdev
->type
, "dir") != 0) {
2611 if (unshare(CLONE_NEWNS
) < 0) {
2612 ERROR("error unsharing mounts");
2616 if (detect_shared_rootfs()) {
2617 if (mount(NULL
, "/", NULL
, MS_SLAVE
|MS_REC
, NULL
)) {
2618 SYSERROR("Failed to make / rslave");
2619 ERROR("Continuing...");
2622 if (bdev
->ops
->mount(bdev
) < 0) {
2626 } else { // TODO come up with a better way
2629 bdev
->dest
= strdup(bdev
->src
);
2632 if (!lxc_list_empty(&conf
->hooks
[LXCHOOK_CLONE
])) {
2633 /* Start of environment variable setup for hooks */
2634 if (setenv("LXC_SRC_NAME", c0
->name
, 1)) {
2635 SYSERROR("failed to set environment variable for source container name");
2637 if (setenv("LXC_NAME", c
->name
, 1)) {
2638 SYSERROR("failed to set environment variable for container name");
2640 if (setenv("LXC_CONFIG_FILE", conf
->rcfile
, 1)) {
2641 SYSERROR("failed to set environment variable for config path");
2643 if (setenv("LXC_ROOTFS_MOUNT", bdev
->dest
, 1)) {
2644 SYSERROR("failed to set environment variable for rootfs mount");
2646 if (setenv("LXC_ROOTFS_PATH", conf
->rootfs
.path
, 1)) {
2647 SYSERROR("failed to set environment variable for rootfs mount");
2650 if (run_lxc_hooks(c
->name
, "clone", conf
, c
->get_config_path(c
), hookargs
)) {
2651 ERROR("Error executing clone hook for %s", c
->name
);
2657 if (!(flags
& LXC_CLONE_KEEPNAME
)) {
2658 ret
= snprintf(path
, MAXPATHLEN
, "%s/etc/hostname", bdev
->dest
);
2661 if (ret
< 0 || ret
>= MAXPATHLEN
)
2663 if (!file_exists(path
))
2665 if (!(fout
= fopen(path
, "w"))) {
2666 SYSERROR("unable to open %s: ignoring", path
);
2669 if (fprintf(fout
, "%s", c
->name
) < 0) {
2673 if (fclose(fout
) < 0)
2682 static int clone_update_rootfs_wrapper(void *data
)
2684 struct clone_update_data
*arg
= (struct clone_update_data
*) data
;
2685 return clone_update_rootfs(arg
);
2689 * We want to support:
2690 sudo lxc-clone -o o1 -n n1 -s -L|-fssize fssize -v|--vgname vgname \
2691 -p|--lvprefix lvprefix -t|--fstype fstype -B backingstore
2693 -s [ implies overlayfs]
2697 only rootfs gets converted (copied/snapshotted) on clone.
2700 static int create_file_dirname(char *path
, struct lxc_conf
*conf
)
2702 char *p
= strrchr(path
, '/');
2708 ret
= do_create_container_dir(path
, conf
);
2713 static struct lxc_container
*lxcapi_clone(struct lxc_container
*c
, const char *newname
,
2714 const char *lxcpath
, int flags
,
2715 const char *bdevtype
, const char *bdevdata
, uint64_t newsize
,
2718 struct lxc_container
*c2
= NULL
;
2719 char newpath
[MAXPATHLEN
];
2720 int ret
, storage_copied
= 0;
2721 char *origroot
= NULL
;
2722 struct clone_update_data data
;
2726 if (!c
|| !c
->is_defined(c
))
2729 if (container_mem_lock(c
))
2732 if (!is_stopped(c
)) {
2733 ERROR("error: Original container (%s) is running", c
->name
);
2737 // Make sure the container doesn't yet exist.
2741 lxcpath
= c
->get_config_path(c
);
2742 ret
= snprintf(newpath
, MAXPATHLEN
, "%s/%s/config", lxcpath
, newname
);
2743 if (ret
< 0 || ret
>= MAXPATHLEN
) {
2744 SYSERROR("clone: failed making config pathname");
2747 if (file_exists(newpath
)) {
2748 ERROR("error: clone: %s exists", newpath
);
2752 ret
= create_file_dirname(newpath
, c
->lxc_conf
);
2753 if (ret
< 0 && errno
!= EEXIST
) {
2754 ERROR("Error creating container dir for %s", newpath
);
2758 // copy the configuration, tweak it as needed,
2759 if (c
->lxc_conf
->rootfs
.path
) {
2760 origroot
= c
->lxc_conf
->rootfs
.path
;
2761 c
->lxc_conf
->rootfs
.path
= NULL
;
2763 fout
= fopen(newpath
, "w");
2765 SYSERROR("open %s", newpath
);
2768 write_config(fout
, c
->lxc_conf
);
2770 c
->lxc_conf
->rootfs
.path
= origroot
;
2772 sprintf(newpath
, "%s/%s/rootfs", lxcpath
, newname
);
2773 if (mkdir(newpath
, 0755) < 0) {
2774 SYSERROR("error creating %s", newpath
);
2779 if (chown_mapped_root(newpath
, c
->lxc_conf
) < 0) {
2780 ERROR("Error chowning %s to container root", newpath
);
2785 c2
= lxc_container_new(newname
, lxcpath
);
2787 ERROR("clone: failed to create new container (%s %s)", newname
,
2792 // copy/snapshot rootfs's
2793 ret
= copy_storage(c
, c2
, bdevtype
, flags
, bdevdata
, newsize
);
2797 clear_unexp_config_line(c2
->lxc_conf
, "lxc.utsname", false);
2800 if (!set_config_item_locked(c2
, "lxc.utsname", newname
)) {
2801 ERROR("Error setting new hostname");
2806 ret
= copyhooks(c
, c2
);
2808 ERROR("error copying hooks");
2812 if (copy_fstab(c
, c2
) < 0) {
2813 ERROR("error copying fstab");
2818 if (!(flags
& LXC_CLONE_KEEPMACADDR
)) {
2819 if (!network_new_hwaddrs(c2
->lxc_conf
)) {
2820 ERROR("Error updating mac addresses");
2825 // We've now successfully created c2's storage, so clear it out if we
2829 if (!c2
->save_config(c2
, NULL
))
2832 if ((pid
= fork()) < 0) {
2837 ret
= wait_for_pid(pid
);
2840 container_mem_unlock(c
);
2846 data
.hookargs
= hookargs
;
2848 ret
= userns_exec_1(c
->lxc_conf
, clone_update_rootfs_wrapper
,
2851 ret
= clone_update_rootfs(&data
);
2855 container_mem_unlock(c
);
2859 container_mem_unlock(c
);
2861 if (!storage_copied
)
2862 c2
->lxc_conf
->rootfs
.path
= NULL
;
2864 lxc_container_put(c2
);
2870 static bool lxcapi_rename(struct lxc_container
*c
, const char *newname
)
2873 struct lxc_container
*newc
;
2875 if (!c
|| !c
->name
|| !c
->config_path
|| !c
->lxc_conf
)
2878 if (has_fs_snapshots(c
) || has_snapshots(c
)) {
2879 ERROR("Renaming a container with snapshots is not supported");
2882 bdev
= bdev_init(c
->lxc_conf
, c
->lxc_conf
->rootfs
.path
, c
->lxc_conf
->rootfs
.mount
, NULL
);
2884 ERROR("Failed to find original backing store type");
2888 newc
= lxcapi_clone(c
, newname
, c
->config_path
, LXC_CLONE_KEEPMACADDR
, NULL
, bdev
->type
, 0, NULL
);
2891 lxc_container_put(newc
);
2895 if (newc
&& lxcapi_is_defined(newc
))
2896 lxc_container_put(newc
);
2898 if (!container_destroy(c
)) {
2899 ERROR("Could not destroy existing container %s", c
->name
);
2905 static int lxcapi_attach(struct lxc_container
*c
, lxc_attach_exec_t exec_function
, void *exec_payload
, lxc_attach_options_t
*options
, pid_t
*attached_process
)
2910 return lxc_attach(c
->name
, c
->config_path
, exec_function
, exec_payload
, options
, attached_process
);
2913 static int lxcapi_attach_run_wait(struct lxc_container
*c
, lxc_attach_options_t
*options
, const char *program
, const char * const argv
[])
2915 lxc_attach_command_t command
;
2922 command
.program
= (char*)program
;
2923 command
.argv
= (char**)argv
;
2924 r
= lxc_attach(c
->name
, c
->config_path
, lxc_attach_run_command
, &command
, options
, &pid
);
2929 return lxc_wait_for_pid_status(pid
);
2932 static int get_next_index(const char *lxcpath
, char *cname
)
2938 fname
= alloca(strlen(lxcpath
) + 20);
2940 sprintf(fname
, "%s/snap%d", lxcpath
, i
);
2941 ret
= stat(fname
, &sb
);
2948 static bool get_snappath_dir(struct lxc_container
*c
, char *snappath
)
2952 * If the old style snapshot path exists, use it
2953 * /var/lib/lxc -> /var/lib/lxcsnaps
2955 ret
= snprintf(snappath
, MAXPATHLEN
, "%ssnaps", c
->config_path
);
2956 if (ret
< 0 || ret
>= MAXPATHLEN
)
2958 if (dir_exists(snappath
)) {
2959 ret
= snprintf(snappath
, MAXPATHLEN
, "%ssnaps/%s", c
->config_path
, c
->name
);
2960 if (ret
< 0 || ret
>= MAXPATHLEN
)
2966 * Use the new style path
2967 * /var/lib/lxc -> /var/lib/lxc + c->name + /snaps + \0
2969 ret
= snprintf(snappath
, MAXPATHLEN
, "%s/%s/snaps", c
->config_path
, c
->name
);
2970 if (ret
< 0 || ret
>= MAXPATHLEN
)
2975 static int lxcapi_snapshot(struct lxc_container
*c
, const char *commentfile
)
2978 struct lxc_container
*c2
;
2979 char snappath
[MAXPATHLEN
], newname
[20];
2981 if (!c
|| !lxcapi_is_defined(c
))
2984 if (!bdev_can_backup(c
->lxc_conf
)) {
2985 ERROR("%s's backing store cannot be backed up.", c
->name
);
2986 ERROR("Your container must use another backing store type.");
2990 if (!get_snappath_dir(c
, snappath
))
2993 i
= get_next_index(snappath
, c
->name
);
2995 if (mkdir_p(snappath
, 0755) < 0) {
2996 ERROR("Failed to create snapshot directory %s", snappath
);
3000 ret
= snprintf(newname
, 20, "snap%d", i
);
3001 if (ret
< 0 || ret
>= 20)
3005 * We pass LXC_CLONE_SNAPSHOT to make sure that a rdepends file entry is
3006 * created in the original container
3008 flags
= LXC_CLONE_SNAPSHOT
| LXC_CLONE_KEEPMACADDR
| LXC_CLONE_KEEPNAME
|
3009 LXC_CLONE_KEEPBDEVTYPE
| LXC_CLONE_MAYBE_SNAPSHOT
;
3010 if (bdev_is_dir(c
->lxc_conf
, c
->lxc_conf
->rootfs
.path
)) {
3011 ERROR("Snapshot of directory-backed container requested.");
3012 ERROR("Making a copy-clone. If you do want snapshots, then");
3013 ERROR("please create an aufs or overlayfs clone first, snapshot that");
3014 ERROR("and keep the original container pristine.");
3015 flags
&= ~LXC_CLONE_SNAPSHOT
| LXC_CLONE_MAYBE_SNAPSHOT
;
3017 c2
= c
->clone(c
, newname
, snappath
, flags
, NULL
, NULL
, 0, NULL
);
3019 ERROR("clone of %s:%s failed", c
->config_path
, c
->name
);
3023 lxc_container_put(c2
);
3025 // Now write down the creation time
3032 tm_info
= localtime(&timer
);
3034 strftime(buffer
, 25, "%Y:%m:%d %H:%M:%S", tm_info
);
3036 char *dfnam
= alloca(strlen(snappath
) + strlen(newname
) + 5);
3037 sprintf(dfnam
, "%s/%s/ts", snappath
, newname
);
3038 f
= fopen(dfnam
, "w");
3040 ERROR("Failed to open %s", dfnam
);
3043 if (fprintf(f
, "%s", buffer
) < 0) {
3044 SYSERROR("Writing timestamp");
3050 SYSERROR("Writing timestamp");
3055 // $p / $name / comment \0
3056 int len
= strlen(snappath
) + strlen(newname
) + 10;
3057 char *path
= alloca(len
);
3058 sprintf(path
, "%s/%s/comment", snappath
, newname
);
3059 return copy_file(commentfile
, path
) < 0 ? -1 : i
;
3065 static void lxcsnap_free(struct lxc_snapshot
*s
)
3069 if (s
->comment_pathname
)
3070 free(s
->comment_pathname
);
3077 static char *get_snapcomment_path(char* snappath
, char *name
)
3079 // $snappath/$name/comment
3080 int ret
, len
= strlen(snappath
) + strlen(name
) + 10;
3081 char *s
= malloc(len
);
3084 ret
= snprintf(s
, len
, "%s/%s/comment", snappath
, name
);
3085 if (ret
< 0 || ret
>= len
) {
3093 static char *get_timestamp(char* snappath
, char *name
)
3095 char path
[MAXPATHLEN
], *s
= NULL
;
3099 ret
= snprintf(path
, MAXPATHLEN
, "%s/%s/ts", snappath
, name
);
3100 if (ret
< 0 || ret
>= MAXPATHLEN
)
3102 fin
= fopen(path
, "r");
3105 (void) fseek(fin
, 0, SEEK_END
);
3107 (void) fseek(fin
, 0, SEEK_SET
);
3112 if (fread(s
, 1, len
, fin
) != len
) {
3113 SYSERROR("reading timestamp");
3123 static int lxcapi_snapshot_list(struct lxc_container
*c
, struct lxc_snapshot
**ret_snaps
)
3125 char snappath
[MAXPATHLEN
], path2
[MAXPATHLEN
];
3127 struct dirent dirent
, *direntp
;
3128 struct lxc_snapshot
*snaps
=NULL
, *nsnaps
;
3131 if (!c
|| !lxcapi_is_defined(c
))
3134 if (!get_snappath_dir(c
, snappath
)) {
3135 ERROR("path name too long");
3138 dir
= opendir(snappath
);
3140 INFO("failed to open %s - assuming no snapshots", snappath
);
3144 while (!readdir_r(dir
, &dirent
, &direntp
)) {
3148 if (!strcmp(direntp
->d_name
, "."))
3151 if (!strcmp(direntp
->d_name
, ".."))
3154 ret
= snprintf(path2
, MAXPATHLEN
, "%s/%s/config", snappath
, direntp
->d_name
);
3155 if (ret
< 0 || ret
>= MAXPATHLEN
) {
3156 ERROR("pathname too long");
3159 if (!file_exists(path2
))
3161 nsnaps
= realloc(snaps
, (count
+ 1)*sizeof(*snaps
));
3163 SYSERROR("Out of memory");
3167 snaps
[count
].free
= lxcsnap_free
;
3168 snaps
[count
].name
= strdup(direntp
->d_name
);
3169 if (!snaps
[count
].name
)
3171 snaps
[count
].lxcpath
= strdup(snappath
);
3172 if (!snaps
[count
].lxcpath
) {
3173 free(snaps
[count
].name
);
3176 snaps
[count
].comment_pathname
= get_snapcomment_path(snappath
, direntp
->d_name
);
3177 snaps
[count
].timestamp
= get_timestamp(snappath
, direntp
->d_name
);
3182 WARN("failed to close directory");
3190 for (i
=0; i
<count
; i
++)
3191 lxcsnap_free(&snaps
[i
]);
3195 WARN("failed to close directory");
3199 static bool lxcapi_snapshot_restore(struct lxc_container
*c
, const char *snapname
, const char *newname
)
3201 char clonelxcpath
[MAXPATHLEN
];
3203 struct lxc_container
*snap
, *rest
;
3207 if (!c
|| !c
->name
|| !c
->config_path
)
3210 if (has_fs_snapshots(c
)) {
3211 ERROR("container rootfs has dependent snapshots");
3215 bdev
= bdev_init(c
->lxc_conf
, c
->lxc_conf
->rootfs
.path
, c
->lxc_conf
->rootfs
.mount
, NULL
);
3217 ERROR("Failed to find original backing store type");
3224 if (!get_snappath_dir(c
, clonelxcpath
)) {
3228 // how should we lock this?
3230 snap
= lxc_container_new(snapname
, clonelxcpath
);
3231 if (!snap
|| !lxcapi_is_defined(snap
)) {
3232 ERROR("Could not open snapshot %s", snapname
);
3233 if (snap
) lxc_container_put(snap
);
3238 if (strcmp(c
->name
, newname
) == 0) {
3239 if (!container_destroy(c
)) {
3240 ERROR("Could not destroy existing container %s", newname
);
3241 lxc_container_put(snap
);
3247 if (strcmp(bdev
->type
, "dir") != 0 && strcmp(bdev
->type
, "loop") != 0)
3248 flags
= LXC_CLONE_SNAPSHOT
| LXC_CLONE_MAYBE_SNAPSHOT
;
3249 rest
= lxcapi_clone(snap
, newname
, c
->config_path
, flags
,
3250 bdev
->type
, NULL
, 0, NULL
);
3252 if (rest
&& lxcapi_is_defined(rest
))
3255 lxc_container_put(rest
);
3256 lxc_container_put(snap
);
3260 static bool do_snapshot_destroy(const char *snapname
, const char *clonelxcpath
)
3262 struct lxc_container
*snap
= NULL
;
3265 snap
= lxc_container_new(snapname
, clonelxcpath
);
3267 ERROR("Could not find snapshot %s", snapname
);
3271 if (!lxcapi_destroy(snap
)) {
3272 ERROR("Could not destroy snapshot %s", snapname
);
3279 lxc_container_put(snap
);
3283 static bool remove_all_snapshots(const char *path
)
3286 struct dirent dirent
, *direntp
;
3289 dir
= opendir(path
);
3291 SYSERROR("opendir on snapshot path %s", path
);
3294 while (!readdir_r(dir
, &dirent
, &direntp
)) {
3297 if (!strcmp(direntp
->d_name
, "."))
3299 if (!strcmp(direntp
->d_name
, ".."))
3301 if (!do_snapshot_destroy(direntp
->d_name
, path
)) {
3310 SYSERROR("Error removing directory %s", path
);
3315 static bool lxcapi_snapshot_destroy(struct lxc_container
*c
, const char *snapname
)
3317 char clonelxcpath
[MAXPATHLEN
];
3319 if (!c
|| !c
->name
|| !c
->config_path
|| !snapname
)
3322 if (!get_snappath_dir(c
, clonelxcpath
))
3325 return do_snapshot_destroy(snapname
, clonelxcpath
);
3328 static bool lxcapi_snapshot_destroy_all(struct lxc_container
*c
)
3330 char clonelxcpath
[MAXPATHLEN
];
3332 if (!c
|| !c
->name
|| !c
->config_path
)
3335 if (!get_snappath_dir(c
, clonelxcpath
))
3338 return remove_all_snapshots(clonelxcpath
);
3341 static bool lxcapi_may_control(struct lxc_container
*c
)
3343 return lxc_try_cmd(c
->name
, c
->config_path
) == 0;
3346 static bool do_add_remove_node(pid_t init_pid
, const char *path
, bool add
,
3349 char chrootpath
[MAXPATHLEN
];
3350 char *directory_path
= NULL
;
3354 if ((pid
= fork()) < 0) {
3355 SYSERROR("failed to fork a child helper");
3359 if (wait_for_pid(pid
) != 0) {
3360 ERROR("Failed to create note in guest");
3366 /* prepare the path */
3367 ret
= snprintf(chrootpath
, MAXPATHLEN
, "/proc/%d/root", init_pid
);
3368 if (ret
< 0 || ret
>= MAXPATHLEN
)
3371 if (chroot(chrootpath
) < 0)
3375 /* remove path if it exists */
3376 if(faccessat(AT_FDCWD
, path
, F_OK
, AT_SYMLINK_NOFOLLOW
) == 0) {
3377 if (unlink(path
) < 0) {
3378 ERROR("unlink failed");
3385 /* create any missing directories */
3386 directory_path
= dirname(strdup(path
));
3387 if (mkdir_p(directory_path
, 0755) < 0 && errno
!= EEXIST
) {
3388 ERROR("failed to create directory");
3392 /* create the device node */
3393 if (mknod(path
, st
->st_mode
, st
->st_rdev
) < 0) {
3394 ERROR("mknod failed");
3401 static bool add_remove_device_node(struct lxc_container
*c
, const char *src_path
, const char *dest_path
, bool add
)
3405 char value
[MAX_BUFFER
];
3408 /* make sure container is running */
3409 if (!c
->is_running(c
)) {
3410 ERROR("container is not running");
3414 /* use src_path if dest_path is NULL otherwise use dest_path */
3415 p
= dest_path
? dest_path
: src_path
;
3417 /* make sure we can access p */
3418 if(access(p
, F_OK
) < 0 || stat(p
, &st
) < 0)
3421 /* continue if path is character device or block device */
3422 if (S_ISCHR(st
.st_mode
))
3423 ret
= snprintf(value
, MAX_BUFFER
, "c %d:%d rwm", major(st
.st_rdev
), minor(st
.st_rdev
));
3424 else if (S_ISBLK(st
.st_mode
))
3425 ret
= snprintf(value
, MAX_BUFFER
, "b %d:%d rwm", major(st
.st_rdev
), minor(st
.st_rdev
));
3429 /* check snprintf return code */
3430 if (ret
< 0 || ret
>= MAX_BUFFER
)
3433 if (!do_add_remove_node(c
->init_pid(c
), p
, add
, &st
))
3436 /* add or remove device to/from cgroup access list */
3438 if (!c
->set_cgroup_item(c
, "devices.allow", value
)) {
3439 ERROR("set_cgroup_item failed while adding the device node");
3443 if (!c
->set_cgroup_item(c
, "devices.deny", value
)) {
3444 ERROR("set_cgroup_item failed while removing the device node");
3452 static bool lxcapi_add_device_node(struct lxc_container
*c
, const char *src_path
, const char *dest_path
)
3455 ERROR(NOT_SUPPORTED_ERROR
, __FUNCTION__
);
3458 return add_remove_device_node(c
, src_path
, dest_path
, true);
3461 static bool lxcapi_remove_device_node(struct lxc_container
*c
, const char *src_path
, const char *dest_path
)
3464 ERROR(NOT_SUPPORTED_ERROR
, __FUNCTION__
);
3467 return add_remove_device_node(c
, src_path
, dest_path
, false);
3471 /* The type of criu invocation, one of "dump" or "restore" */
3474 /* The directory to pass to criu */
3477 /* The container to dump */
3478 struct lxc_container
*c
;
3480 /* Enable criu verbose mode? */
3483 /* dump: stop the container or not after dumping? */
3486 /* restore: the file to write the init process' pid into */
3491 * @out must be 128 bytes long
3493 static int read_criu_file(const char *directory
, const char *file
, int netnr
, char *out
)
3495 char path
[PATH_MAX
];
3499 ret
= snprintf(path
, PATH_MAX
, "%s/%s%d", directory
, file
, netnr
);
3500 if (ret
< 0 || ret
>= PATH_MAX
) {
3501 ERROR("%s: path too long", __func__
);
3505 f
= fopen(path
, "r");
3509 ret
= fscanf(f
, "%127s", out
);
3517 static void exec_criu(struct criu_opts
*opts
)
3519 char **argv
, log
[PATH_MAX
];
3520 int static_args
= 14, argc
= 0, i
, ret
;
3522 /* The command line always looks like:
3523 * criu $(action) --tcp-established --file-locks --link-remap --force-irmap \
3524 * --manage-cgroups action-script foo.sh -D $(directory) \
3525 * -o $(directory)/$(action).log
3526 * +1 for final NULL */
3528 if (strcmp(opts
->action
, "dump") == 0) {
3532 /* --leave-running */
3535 } else if (strcmp(opts
->action
, "restore") == 0) {
3536 /* --root $(lxc_mount_point) --restore-detached --pidfile $foo */
3545 ret
= snprintf(log
, PATH_MAX
, "%s/%s.log", opts
->directory
, opts
->action
);
3546 if (ret
< 0 || ret
>= PATH_MAX
) {
3547 ERROR("logfile name too long\n");
3551 argv
= malloc(static_args
* sizeof(*argv
));
3555 memset(argv
, 0, static_args
* sizeof(*argv
));
3557 #define DECLARE_ARG(arg) \
3559 argv[argc++] = strdup(arg); \
3560 if (!argv[argc-1]) \
3564 argv
[argc
++] = on_path("criu", NULL
);
3565 if (!argv
[argc
-1]) {
3566 ERROR("Couldn't find criu binary\n");
3570 DECLARE_ARG(opts
->action
);
3571 DECLARE_ARG("--tcp-established");
3572 DECLARE_ARG("--file-locks");
3573 DECLARE_ARG("--link-remap");
3574 DECLARE_ARG("--force-irmap");
3575 DECLARE_ARG("--manage-cgroups");
3576 DECLARE_ARG("--action-script");
3577 DECLARE_ARG(LIBEXECDIR
"/lxc/lxc-restore-net");
3579 DECLARE_ARG(opts
->directory
);
3584 DECLARE_ARG("-vvvvvv");
3586 if (strcmp(opts
->action
, "dump") == 0) {
3589 if (sprintf(pid
, "%d", lxcapi_init_pid(opts
->c
)) < 0)
3595 DECLARE_ARG("--leave-running");
3596 } else if (strcmp(opts
->action
, "restore") == 0) {
3598 struct lxc_list
*it
;
3600 DECLARE_ARG("--root");
3601 DECLARE_ARG(opts
->c
->lxc_conf
->rootfs
.mount
);
3602 DECLARE_ARG("--restore-detached");
3603 DECLARE_ARG("--pidfile");
3604 DECLARE_ARG(opts
->pidfile
);
3606 lxc_list_for_each(it
, &opts
->c
->lxc_conf
->network
) {
3607 char eth
[128], veth
[128], buf
[257];
3610 if (read_criu_file(opts
->directory
, "veth", netnr
, veth
))
3612 if (read_criu_file(opts
->directory
, "eth", netnr
, eth
))
3614 ret
= snprintf(buf
, 257, "%s=%s", eth
, veth
);
3615 if (ret
< 0 || ret
>= 257)
3618 /* final NULL and --veth-pair eth0:vethASDF */
3619 m
= realloc(argv
, (argc
+ 1 + 2) * sizeof(*argv
));
3624 DECLARE_ARG("--veth-pair");
3634 execv(argv
[0], argv
);
3636 for (i
= 0; argv
[i
]; i
++)
3641 /* Check and make sure the container has a configuration that we know CRIU can
3643 static bool criu_ok(struct lxc_container
*c
)
3645 struct lxc_list
*it
;
3646 bool found_deny_rule
= false;
3649 ERROR("Must be root to checkpoint\n");
3653 /* We only know how to restore containers with veth networks. */
3654 lxc_list_for_each(it
, &c
->lxc_conf
->network
) {
3655 struct lxc_netdev
*n
= it
->elem
;
3656 if (n
->type
!= LXC_NET_VETH
&& n
->type
!= LXC_NET_NONE
) {
3657 ERROR("Found network that is not VETH or NONE\n");
3662 // These requirements come from http://criu.org/LXC
3663 if (c
->lxc_conf
->console
.path
&&
3664 strcmp(c
->lxc_conf
->console
.path
, "none") != 0) {
3665 ERROR("lxc.console must be none\n");
3669 if (c
->lxc_conf
->tty
!= 0) {
3670 ERROR("lxc.tty must be 0\n");
3674 lxc_list_for_each(it
, &c
->lxc_conf
->cgroup
) {
3675 struct lxc_cgroup
*cg
= it
->elem
;
3676 if (strcmp(cg
->subsystem
, "devices.deny") == 0 &&
3677 strcmp(cg
->value
, "c 5:1 rwm") == 0) {
3679 found_deny_rule
= true;
3684 if (!found_deny_rule
) {
3685 ERROR("couldn't find devices.deny = c 5:1 rwm");
3692 static bool lxcapi_checkpoint(struct lxc_container
*c
, char *directory
, bool stop
, bool verbose
)
3695 struct lxc_list
*it
;
3702 if (mkdir(directory
, 0700) < 0 && errno
!= EEXIST
)
3706 lxc_list_for_each(it
, &c
->lxc_conf
->network
) {
3707 char *veth
= NULL
, *bridge
= NULL
, veth_path
[PATH_MAX
], eth
[128];
3708 struct lxc_netdev
*n
= it
->elem
;
3711 pret
= snprintf(veth_path
, PATH_MAX
, "lxc.network.%d.veth.pair", netnr
);
3712 if (pret
< 0 || pret
>= PATH_MAX
) {
3717 veth
= lxcapi_get_running_config_item(c
, veth_path
);
3719 /* criu_ok() checks that all interfaces are
3720 * LXC_NET{VETH,NONE}, and VETHs should have this
3722 assert(n
->type
== LXC_NET_NONE
);
3726 pret
= snprintf(veth_path
, PATH_MAX
, "lxc.network.%d.link", netnr
);
3727 if (pret
< 0 || pret
>= PATH_MAX
) {
3732 bridge
= lxcapi_get_running_config_item(c
, veth_path
);
3738 pret
= snprintf(veth_path
, PATH_MAX
, "%s/veth%d", directory
, netnr
);
3739 if (pret
< 0 || pret
>= PATH_MAX
|| print_to_file(veth_path
, veth
) < 0) {
3744 pret
= snprintf(veth_path
, PATH_MAX
, "%s/bridge%d", directory
, netnr
);
3745 if (pret
< 0 || pret
>= PATH_MAX
|| print_to_file(veth_path
, bridge
) < 0) {
3751 if (strlen(n
->name
) >= 128) {
3755 strncpy(eth
, n
->name
, 128);
3757 sprintf(eth
, "eth%d", netnr
);
3759 pret
= snprintf(veth_path
, PATH_MAX
, "%s/eth%d", directory
, netnr
);
3760 if (pret
< 0 || pret
>= PATH_MAX
|| print_to_file(veth_path
, eth
) < 0)
3775 struct criu_opts os
;
3778 os
.directory
= directory
;
3781 os
.verbose
= verbose
;
3783 /* exec_criu() returning is an error */
3787 pid_t w
= waitpid(pid
, &status
, 0);
3793 if (WIFEXITED(status
)) {
3794 return !WEXITSTATUS(status
);
3801 static bool lxcapi_restore(struct lxc_container
*c
, char *directory
, bool verbose
)
3804 struct lxc_list
*it
;
3805 struct lxc_rootfs
*rootfs
;
3806 char pidfile
[L_tmpnam
];
3812 ERROR("Must be root to restore\n");
3816 if (!tmpnam(pidfile
))
3819 struct lxc_handler
*handler
;
3821 handler
= lxc_init(c
->name
, c
->lxc_conf
, c
->config_path
);
3830 struct criu_opts os
;
3832 if (unshare(CLONE_NEWNS
))
3835 /* CRIU needs the lxc root bind mounted so that it is the root of some
3837 rootfs
= &c
->lxc_conf
->rootfs
;
3839 if (rootfs_is_blockdev(c
->lxc_conf
)) {
3840 if (do_rootfs_setup(c
->lxc_conf
, c
->name
, c
->config_path
) < 0)
3844 if (mkdir(rootfs
->mount
, 0755) < 0 && errno
!= EEXIST
)
3847 if (mount(rootfs
->path
, rootfs
->mount
, NULL
, MS_BIND
, NULL
) < 0) {
3848 rmdir(rootfs
->mount
);
3853 os
.action
= "restore";
3854 os
.directory
= directory
;
3856 os
.pidfile
= pidfile
;
3857 os
.verbose
= verbose
;
3859 /* exec_criu() returning is an error */
3861 umount(rootfs
->mount
);
3862 rmdir(rootfs
->mount
);
3866 pid_t w
= waitpid(pid
, &status
, 0);
3873 if (WIFEXITED(status
)) {
3874 if (WEXITSTATUS(status
)) {
3880 FILE *f
= fopen(pidfile
, "r");
3882 perror("reading pidfile");
3883 ERROR("couldn't read restore's init pidfile %s\n", pidfile
);
3887 ret
= fscanf(f
, "%d", (int*) &handler
->pid
);
3890 ERROR("reading restore pid failed");
3894 if (container_mem_lock(c
))
3897 lxc_list_for_each(it
, &c
->lxc_conf
->network
) {
3898 char eth
[128], veth
[128];
3899 struct lxc_netdev
*netdev
= it
->elem
;
3901 if (read_criu_file(directory
, "veth", netnr
, veth
)) {
3905 if (read_criu_file(directory
, "eth", netnr
, eth
)) {
3909 netdev
->priv
.veth_attr
.pair
= strdup(veth
);
3910 if (!netdev
->priv
.veth_attr
.pair
) {
3917 container_mem_unlock(c
);
3921 if (lxc_set_state(c
->name
, handler
, RUNNING
))
3926 if (lxc_poll(c
->name
, handler
)) {
3927 lxc_abort(c
->name
, handler
);
3935 static int lxcapi_attach_run_waitl(struct lxc_container
*c
, lxc_attach_options_t
*options
, const char *program
, const char *arg
, ...)
3945 argv
= lxc_va_arg_list_to_argv_const(ap
, 1);
3949 ERROR("Memory allocation error.");
3954 ret
= lxcapi_attach_run_wait(c
, options
, program
, (const char * const *)argv
);
3959 struct lxc_container
*lxc_container_new(const char *name
, const char *configpath
)
3961 struct lxc_container
*c
;
3966 c
= malloc(sizeof(*c
));
3968 fprintf(stderr
, "failed to malloc lxc_container\n");
3971 memset(c
, 0, sizeof(*c
));
3974 c
->config_path
= strdup(configpath
);
3976 c
->config_path
= strdup(lxc_global_config_value("lxc.lxcpath"));
3978 if (!c
->config_path
) {
3979 fprintf(stderr
, "Out of memory\n");
3983 remove_trailing_slashes(c
->config_path
);
3984 c
->name
= malloc(strlen(name
)+1);
3986 fprintf(stderr
, "Error allocating lxc_container name\n");
3989 strcpy(c
->name
, name
);
3992 if (!(c
->slock
= lxc_newlock(c
->config_path
, name
))) {
3993 fprintf(stderr
, "failed to create lock\n");
3997 if (!(c
->privlock
= lxc_newlock(NULL
, NULL
))) {
3998 fprintf(stderr
, "failed to alloc privlock\n");
4002 if (!set_config_filename(c
)) {
4003 fprintf(stderr
, "Error allocating config file pathname\n");
4007 if (file_exists(c
->configfile
) && !lxcapi_load_config(c
, NULL
))
4010 if (ongoing_create(c
) == 2) {
4011 ERROR("Error: %s creation was not completed", c
->name
);
4012 container_destroy(c
);
4013 lxcapi_clear_config(c
);
4015 c
->daemonize
= true;
4018 // assign the member functions
4019 c
->is_defined
= lxcapi_is_defined
;
4020 c
->state
= lxcapi_state
;
4021 c
->is_running
= lxcapi_is_running
;
4022 c
->freeze
= lxcapi_freeze
;
4023 c
->unfreeze
= lxcapi_unfreeze
;
4024 c
->console
= lxcapi_console
;
4025 c
->console_getfd
= lxcapi_console_getfd
;
4026 c
->init_pid
= lxcapi_init_pid
;
4027 c
->load_config
= lxcapi_load_config
;
4028 c
->want_daemonize
= lxcapi_want_daemonize
;
4029 c
->want_close_all_fds
= lxcapi_want_close_all_fds
;
4030 c
->start
= lxcapi_start
;
4031 c
->startl
= lxcapi_startl
;
4032 c
->stop
= lxcapi_stop
;
4033 c
->config_file_name
= lxcapi_config_file_name
;
4034 c
->wait
= lxcapi_wait
;
4035 c
->set_config_item
= lxcapi_set_config_item
;
4036 c
->destroy
= lxcapi_destroy
;
4037 c
->destroy_with_snapshots
= lxcapi_destroy_with_snapshots
;
4038 c
->rename
= lxcapi_rename
;
4039 c
->save_config
= lxcapi_save_config
;
4040 c
->get_keys
= lxcapi_get_keys
;
4041 c
->create
= lxcapi_create
;
4042 c
->createl
= lxcapi_createl
;
4043 c
->shutdown
= lxcapi_shutdown
;
4044 c
->reboot
= lxcapi_reboot
;
4045 c
->clear_config
= lxcapi_clear_config
;
4046 c
->clear_config_item
= lxcapi_clear_config_item
;
4047 c
->get_config_item
= lxcapi_get_config_item
;
4048 c
->get_running_config_item
= lxcapi_get_running_config_item
;
4049 c
->get_cgroup_item
= lxcapi_get_cgroup_item
;
4050 c
->set_cgroup_item
= lxcapi_set_cgroup_item
;
4051 c
->get_config_path
= lxcapi_get_config_path
;
4052 c
->set_config_path
= lxcapi_set_config_path
;
4053 c
->clone
= lxcapi_clone
;
4054 c
->get_interfaces
= lxcapi_get_interfaces
;
4055 c
->get_ips
= lxcapi_get_ips
;
4056 c
->attach
= lxcapi_attach
;
4057 c
->attach_run_wait
= lxcapi_attach_run_wait
;
4058 c
->attach_run_waitl
= lxcapi_attach_run_waitl
;
4059 c
->snapshot
= lxcapi_snapshot
;
4060 c
->snapshot_list
= lxcapi_snapshot_list
;
4061 c
->snapshot_restore
= lxcapi_snapshot_restore
;
4062 c
->snapshot_destroy
= lxcapi_snapshot_destroy
;
4063 c
->snapshot_destroy_all
= lxcapi_snapshot_destroy_all
;
4064 c
->may_control
= lxcapi_may_control
;
4065 c
->add_device_node
= lxcapi_add_device_node
;
4066 c
->remove_device_node
= lxcapi_remove_device_node
;
4067 c
->checkpoint
= lxcapi_checkpoint
;
4068 c
->restore
= lxcapi_restore
;
4070 /* we'll allow the caller to update these later */
4071 if (lxc_log_init(NULL
, "none", NULL
, "lxc_container", 0, c
->config_path
)) {
4072 fprintf(stderr
, "failed to open log\n");
4079 lxc_container_free(c
);
4083 int lxc_get_wait_states(const char **states
)
4088 for (i
=0; i
<MAX_STATE
; i
++)
4089 states
[i
] = lxc_state2str(i
);
4094 * These next two could probably be done smarter with reusing a common function
4095 * with different iterators and tests...
4097 int list_defined_containers(const char *lxcpath
, char ***names
, struct lxc_container
***cret
)
4100 int i
, cfound
= 0, nfound
= 0;
4101 struct dirent dirent
, *direntp
;
4102 struct lxc_container
*c
;
4105 lxcpath
= lxc_global_config_value("lxc.lxcpath");
4107 dir
= opendir(lxcpath
);
4109 SYSERROR("opendir on lxcpath");
4118 while (!readdir_r(dir
, &dirent
, &direntp
)) {
4121 if (!strcmp(direntp
->d_name
, "."))
4123 if (!strcmp(direntp
->d_name
, ".."))
4126 if (!config_file_exists(lxcpath
, direntp
->d_name
))
4130 if (!add_to_array(names
, direntp
->d_name
, cfound
))
4140 c
= lxc_container_new(direntp
->d_name
, lxcpath
);
4142 INFO("Container %s:%s has a config but could not be loaded",
4143 lxcpath
, direntp
->d_name
);
4145 if(!remove_from_array(names
, direntp
->d_name
, cfound
--))
4149 if (!lxcapi_is_defined(c
)) {
4150 INFO("Container %s:%s has a config but is not defined",
4151 lxcpath
, direntp
->d_name
);
4153 if(!remove_from_array(names
, direntp
->d_name
, cfound
--))
4155 lxc_container_put(c
);
4159 if (!add_to_clist(cret
, c
, nfound
, true)) {
4160 lxc_container_put(c
);
4170 if (names
&& *names
) {
4171 for (i
=0; i
<cfound
; i
++)
4175 if (cret
&& *cret
) {
4176 for (i
=0; i
<nfound
; i
++)
4177 lxc_container_put((*cret
)[i
]);
4184 int list_active_containers(const char *lxcpath
, char ***nret
,
4185 struct lxc_container
***cret
)
4187 int i
, ret
= -1, cret_cnt
= 0, ct_name_cnt
= 0;
4190 char **ct_name
= NULL
;
4192 struct lxc_container
*c
;
4196 lxcpath
= lxc_global_config_value("lxc.lxcpath");
4197 lxcpath_len
= strlen(lxcpath
);
4204 FILE *f
= fopen("/proc/net/unix", "r");
4208 while (getline(&line
, &len
, f
) != -1) {
4210 char *p
= strrchr(line
, ' '), *p2
;
4219 if (strncmp(p
, lxcpath
, lxcpath_len
) == 0) {
4221 } else if (strncmp(p
, "lxc/", 4) == 0) {
4231 // Now p is the start of lxc_name
4233 if (!p2
|| strncmp(p2
, "/command", 8) != 0)
4238 if (strncmp(lxcpath
, lxc_cmd_get_lxcpath(p
), lxcpath_len
) != 0)
4240 p
= lxc_cmd_get_name(p
);
4243 if (array_contains(&ct_name
, p
, ct_name_cnt
))
4246 if (!add_to_array(&ct_name
, p
, ct_name_cnt
))
4247 goto free_cret_list
;
4254 c
= lxc_container_new(p
, lxcpath
);
4256 INFO("Container %s:%s is running but could not be loaded",
4258 remove_from_array(&ct_name
, p
, ct_name_cnt
--);
4263 * If this is an anonymous container, then is_defined *can*
4264 * return false. So we don't do that check. Count on the
4265 * fact that the command socket exists.
4268 if (!add_to_clist(cret
, c
, cret_cnt
, true)) {
4269 lxc_container_put(c
);
4270 goto free_cret_list
;
4275 assert(!nret
|| !cret
|| cret_cnt
== ct_name_cnt
);
4284 if (cret
&& *cret
) {
4285 for (i
= 0; i
< cret_cnt
; i
++)
4286 lxc_container_put((*cret
)[i
]);
4292 for (i
= 0; i
< ct_name_cnt
; i
++)
4305 int list_all_containers(const char *lxcpath
, char ***nret
,
4306 struct lxc_container
***cret
)
4308 int i
, ret
, active_cnt
, ct_cnt
, ct_list_cnt
;
4311 struct lxc_container
**ct_list
= NULL
;
4313 ct_cnt
= list_defined_containers(lxcpath
, &ct_name
, NULL
);
4317 active_cnt
= list_active_containers(lxcpath
, &active_name
, NULL
);
4318 if (active_cnt
< 0) {
4323 for (i
= 0; i
< active_cnt
; i
++) {
4324 if (!array_contains(&ct_name
, active_name
[i
], ct_cnt
)) {
4325 if (!add_to_array(&ct_name
, active_name
[i
], ct_cnt
)) {
4327 goto free_active_name
;
4331 free(active_name
[i
]);
4332 active_name
[i
] = NULL
;
4338 for (i
= 0, ct_list_cnt
= 0; i
< ct_cnt
&& cret
; i
++) {
4339 struct lxc_container
*c
;
4341 c
= lxc_container_new(ct_name
[i
], lxcpath
);
4343 WARN("Container %s:%s could not be loaded", lxcpath
, ct_name
[i
]);
4344 remove_from_array(&ct_name
, ct_name
[i
], ct_cnt
--);
4348 if (!add_to_clist(&ct_list
, c
, ct_list_cnt
, false)) {
4349 lxc_container_put(c
);
4368 for (i
= 0; i
< ct_list_cnt
; i
++) {
4369 lxc_container_put(ct_list
[i
]);
4375 for (i
= 0; i
< active_cnt
; i
++) {
4377 free(active_name
[i
]);
4383 for (i
= 0; i
< ct_cnt
; i
++) {