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>
39 #include <sys/syscall.h>
41 #include <lxc/lxccontainer.h>
42 #include <lxc/version.h>
43 #include <lxc/network.h>
59 #include "namespace.h"
67 #include <../include/ifaddrs.h>
71 #include <../include/lxcmntent.h>
76 #define MAX_BUFFER 4096
78 #define NOT_SUPPORTED_ERROR "the requested function %s is not currently supported with unprivileged containers"
80 /* Define faccessat() if missing from the C library */
81 #ifndef HAVE_FACCESSAT
82 static int faccessat(int __fd
, const char *__file
, int __type
, int __flag
)
85 return syscall(__NR_faccessat
, __fd
, __file
, __type
, __flag
);
93 lxc_log_define(lxc_container
, lxc
);
95 static bool do_lxcapi_destroy(struct lxc_container
*c
);
96 static const char *lxcapi_get_config_path(struct lxc_container
*c
);
97 #define do_lxcapi_get_config_path(c) lxcapi_get_config_path(c)
98 static bool do_lxcapi_set_config_item(struct lxc_container
*c
, const char *key
, const char *v
);
99 static bool container_destroy(struct lxc_container
*c
);
100 static bool get_snappath_dir(struct lxc_container
*c
, char *snappath
);
101 static bool lxcapi_snapshot_destroy_all(struct lxc_container
*c
);
102 static bool do_lxcapi_save_config(struct lxc_container
*c
, const char *alt_file
);
104 static bool config_file_exists(const char *lxcpath
, const char *cname
)
106 /* $lxcpath + '/' + $cname + '/config' + \0 */
107 int ret
, len
= strlen(lxcpath
) + strlen(cname
) + 9;
108 char *fname
= alloca(len
);
110 ret
= snprintf(fname
, len
, "%s/%s/config", lxcpath
, cname
);
111 if (ret
< 0 || ret
>= len
)
114 return file_exists(fname
);
118 * A few functions to help detect when a container creation failed.
119 * If a container creation was killed partway through, then trying
120 * to actually start that container could harm the host. We detect
121 * this by creating a 'partial' file under the container directory,
122 * and keeping an advisory lock. When container creation completes,
123 * we remove that file. When we load or try to start a container, if
124 * we find that file, without a flock, we remove the container.
126 static int ongoing_create(struct lxc_container
*c
)
128 int len
= strlen(c
->config_path
) + strlen(c
->name
) + 10;
129 char *path
= alloca(len
);
133 ret
= snprintf(path
, len
, "%s/%s/partial", c
->config_path
, c
->name
);
134 if (ret
< 0 || ret
>= len
) {
135 ERROR("Error writing partial pathname");
139 if (!file_exists(path
))
141 fd
= open(path
, O_RDWR
);
143 // give benefit of the doubt
144 SYSERROR("Error opening partial file");
148 lk
.l_whence
= SEEK_SET
;
152 if (fcntl(fd
, F_GETLK
, &lk
) == 0 && lk
.l_pid
!= -1) {
153 // create is still ongoing
157 // create completed but partial is still there.
162 static int create_partial(struct lxc_container
*c
)
164 // $lxcpath + '/' + $name + '/partial' + \0
165 int len
= strlen(c
->config_path
) + strlen(c
->name
) + 10;
166 char *path
= alloca(len
);
170 ret
= snprintf(path
, len
, "%s/%s/partial", c
->config_path
, c
->name
);
171 if (ret
< 0 || ret
>= len
) {
172 ERROR("Error writing partial pathname");
175 if ((fd
=open(path
, O_RDWR
| O_CREAT
| O_EXCL
, 0755)) < 0) {
176 SYSERROR("Erorr creating partial file");
180 lk
.l_whence
= SEEK_SET
;
183 if (fcntl(fd
, F_SETLKW
, &lk
) < 0) {
184 SYSERROR("Error locking partial file %s", path
);
192 static void remove_partial(struct lxc_container
*c
, int fd
)
194 // $lxcpath + '/' + $name + '/partial' + \0
195 int len
= strlen(c
->config_path
) + strlen(c
->name
) + 10;
196 char *path
= alloca(len
);
200 ret
= snprintf(path
, len
, "%s/%s/partial", c
->config_path
, c
->name
);
201 if (ret
< 0 || ret
>= len
) {
202 ERROR("Error writing partial pathname");
205 if (unlink(path
) < 0)
206 SYSERROR("Error unlink partial file %s", path
);
210 * 1. container_mem_lock(c) protects the struct lxc_container from multiple threads.
211 * 2. container_disk_lock(c) protects the on-disk container data - in particular the
212 * container configuration file.
213 * The container_disk_lock also takes the container_mem_lock.
214 * 3. thread_mutex protects process data (ex: fd table) from multiple threads.
215 * NOTHING mutexes two independent programs with their own struct
216 * lxc_container for the same c->name, between API calls. For instance,
217 * c->config_read(); c->start(); Between those calls, data on disk
218 * could change (which shouldn't bother the caller unless for instance
219 * the rootfs get moved). c->config_read(); update; c->config_write();
220 * Two such updaters could race. The callers should therefore check their
221 * results. Trying to prevent that would necessarily expose us to deadlocks
222 * due to hung callers. So I prefer to keep the locks only within our own
223 * functions, not across functions.
225 * If you're going to clone while holding a lxccontainer, increment
226 * c->numthreads (under privlock) before forking. When deleting,
227 * decrement numthreads under privlock, then if it hits 0 you can delete.
228 * Do not ever use a lxccontainer whose numthreads you did not bump.
231 static void lxc_container_free(struct lxc_container
*c
)
237 c
->configfile
= NULL
;
238 free(c
->error_string
);
239 c
->error_string
= NULL
;
241 lxc_putlock(c
->slock
);
245 lxc_putlock(c
->privlock
);
251 lxc_conf_free(c
->lxc_conf
);
254 free(c
->config_path
);
255 c
->config_path
= NULL
;
261 * Consider the following case:
262 freer | racing get()er
263 ==================================================================
264 lxc_container_put() | lxc_container_get()
265 \ lxclock(c->privlock) | c->numthreads < 1? (no)
266 \ c->numthreads = 0 | \ lxclock(c->privlock) -> waits
268 \ lxc_container_free() | \ lxclock() returns
269 | \ c->numthreads < 1 -> return 0
271 \ \ sem_destroy(privlock) |
273 * When the get()er checks numthreads the first time, one of the following
275 * 1. freer has set numthreads = 0. get() returns 0
276 * 2. freer is between lxclock and setting numthreads to 0. get()er will
277 * sem_wait on privlock, get lxclock after freer() drops it, then see
278 * numthreads is 0 and exit without touching lxclock again..
279 * 3. freer has not yet locked privlock. If get()er runs first, then put()er
280 * will see --numthreads = 1 and not call lxc_container_free().
283 int lxc_container_get(struct lxc_container
*c
)
288 // if someone else has already started freeing the container, don't
289 // try to take the lock, which may be invalid
290 if (c
->numthreads
< 1)
293 if (container_mem_lock(c
))
295 if (c
->numthreads
< 1) {
296 // bail without trying to unlock, bc the privlock is now probably
301 container_mem_unlock(c
);
305 int lxc_container_put(struct lxc_container
*c
)
309 if (container_mem_lock(c
))
311 if (--c
->numthreads
< 1) {
312 container_mem_unlock(c
);
313 lxc_container_free(c
);
316 container_mem_unlock(c
);
320 static bool do_lxcapi_is_defined(struct lxc_container
*c
)
329 if (container_mem_lock(c
))
333 statret
= stat(c
->configfile
, &statbuf
);
339 container_mem_unlock(c
);
343 #define WRAP_API(rettype, fnname) \
344 static rettype fnname(struct lxc_container *c) \
347 current_config = c ? c->lxc_conf : NULL; \
348 ret = do_##fnname(c); \
349 current_config = NULL; \
353 #define WRAP_API_1(rettype, fnname, t1) \
354 static rettype fnname(struct lxc_container *c, t1 a1) \
357 current_config = c ? c->lxc_conf : NULL; \
358 ret = do_##fnname(c, a1); \
359 current_config = NULL; \
363 #define WRAP_API_2(rettype, fnname, t1, t2) \
364 static rettype fnname(struct lxc_container *c, t1 a1, t2 a2) \
367 current_config = c ? c->lxc_conf : NULL; \
368 ret = do_##fnname(c, a1, a2); \
369 current_config = NULL; \
373 #define WRAP_API_3(rettype, fnname, t1, t2, t3) \
374 static rettype fnname(struct lxc_container *c, t1 a1, t2 a2, t3 a3) \
377 current_config = c ? c->lxc_conf : NULL; \
378 ret = do_##fnname(c, a1, a2, a3); \
379 current_config = NULL; \
383 WRAP_API(bool, lxcapi_is_defined
)
385 static const char *do_lxcapi_state(struct lxc_container
*c
)
391 s
= lxc_getstate(c
->name
, c
->config_path
);
392 return lxc_state2str(s
);
395 WRAP_API(const char *, lxcapi_state
)
397 static bool is_stopped(struct lxc_container
*c
)
400 s
= lxc_getstate(c
->name
, c
->config_path
);
401 return (s
== STOPPED
);
404 static bool do_lxcapi_is_running(struct lxc_container
*c
)
410 s
= do_lxcapi_state(c
);
411 if (!s
|| strcmp(s
, "STOPPED") == 0)
416 WRAP_API(bool, lxcapi_is_running
)
418 static bool do_lxcapi_freeze(struct lxc_container
*c
)
424 ret
= lxc_freeze(c
->name
, c
->config_path
);
430 WRAP_API(bool, lxcapi_freeze
)
432 static bool do_lxcapi_unfreeze(struct lxc_container
*c
)
438 ret
= lxc_unfreeze(c
->name
, c
->config_path
);
444 WRAP_API(bool, lxcapi_unfreeze
)
446 static int do_lxcapi_console_getfd(struct lxc_container
*c
, int *ttynum
, int *masterfd
)
452 ttyfd
= lxc_console_getfd(c
, ttynum
, masterfd
);
456 WRAP_API_2(int, lxcapi_console_getfd
, int *, int *)
458 static int lxcapi_console(struct lxc_container
*c
, int ttynum
, int stdinfd
,
459 int stdoutfd
, int stderrfd
, int escape
)
466 current_config
= c
->lxc_conf
;
467 ret
= lxc_console(c
, ttynum
, stdinfd
, stdoutfd
, stderrfd
, escape
);
468 current_config
= NULL
;
472 static pid_t
do_lxcapi_init_pid(struct lxc_container
*c
)
477 return lxc_cmd_get_init_pid(c
->name
, c
->config_path
);
480 WRAP_API(pid_t
, lxcapi_init_pid
)
482 static bool load_config_locked(struct lxc_container
*c
, const char *fname
)
485 c
->lxc_conf
= lxc_conf_init();
488 if (lxc_config_read(fname
, c
->lxc_conf
, false) != 0)
493 static bool do_lxcapi_load_config(struct lxc_container
*c
, const char *alt_file
)
495 bool ret
= false, need_disklock
= false;
501 fname
= c
->configfile
;
507 * If we're reading something other than the container's config,
508 * we only need to lock the in-memory container. If loading the
509 * container's config file, take the disk lock.
511 if (strcmp(fname
, c
->configfile
) == 0)
512 need_disklock
= true;
515 lret
= container_disk_lock(c
);
517 lret
= container_mem_lock(c
);
521 ret
= load_config_locked(c
, fname
);
524 container_disk_unlock(c
);
526 container_mem_unlock(c
);
530 WRAP_API_1(bool, lxcapi_load_config
, const char *)
532 static bool do_lxcapi_want_daemonize(struct lxc_container
*c
, bool state
)
534 if (!c
|| !c
->lxc_conf
)
536 if (container_mem_lock(c
)) {
537 ERROR("Error getting mem lock");
540 c
->daemonize
= state
;
541 container_mem_unlock(c
);
545 WRAP_API_1(bool, lxcapi_want_daemonize
, bool)
547 static bool do_lxcapi_want_close_all_fds(struct lxc_container
*c
, bool state
)
549 if (!c
|| !c
->lxc_conf
)
551 if (container_mem_lock(c
)) {
552 ERROR("Error getting mem lock");
555 c
->lxc_conf
->close_all_fds
= state
;
556 container_mem_unlock(c
);
560 WRAP_API_1(bool, lxcapi_want_close_all_fds
, bool)
562 static bool do_lxcapi_wait(struct lxc_container
*c
, const char *state
, int timeout
)
569 ret
= lxc_wait(c
->name
, state
, timeout
, c
->config_path
);
573 WRAP_API_2(bool, lxcapi_wait
, const char *, int)
575 static bool do_wait_on_daemonized_start(struct lxc_container
*c
, int pid
)
577 /* we'll probably want to make this timeout configurable? */
578 int timeout
= 5, ret
, status
;
581 * our child is going to fork again, then exit. reap the
584 ret
= waitpid(pid
, &status
, 0);
585 if (ret
== -1 || !WIFEXITED(status
) || WEXITSTATUS(status
) != 0)
586 DEBUG("failed waiting for first dual-fork child");
587 return do_lxcapi_wait(c
, "RUNNING", timeout
);
590 WRAP_API_1(bool, wait_on_daemonized_start
, int)
592 static bool am_single_threaded(void)
594 struct dirent dirent
, *direntp
;
598 dir
= opendir("/proc/self/task");
600 INFO("failed to open /proc/self/task");
604 while (!readdir_r(dir
, &dirent
, &direntp
)) {
608 if (!strcmp(direntp
->d_name
, "."))
611 if (!strcmp(direntp
->d_name
, ".."))
621 * I can't decide if it'd be more convenient for callers if we accept '...',
622 * or a null-terminated array (i.e. execl vs execv)
624 static bool do_lxcapi_start(struct lxc_container
*c
, int useinit
, char * const argv
[])
627 struct lxc_conf
*conf
;
628 bool daemonize
= false;
630 char *default_args
[] = {
636 /* container exists */
639 /* container has been setup */
643 if ((ret
= ongoing_create(c
)) < 0) {
644 ERROR("Error checking for incomplete creation");
648 ERROR("Error: %s creation was not completed", c
->name
);
649 do_lxcapi_destroy(c
);
651 } else if (ret
== 1) {
652 ERROR("Error: creation of %s is ongoing", c
->name
);
656 /* is this app meant to be run through lxcinit, as in lxc-execute? */
657 if (useinit
&& !argv
)
660 if (container_mem_lock(c
))
663 daemonize
= c
->daemonize
;
664 container_mem_unlock(c
);
667 ret
= lxc_execute(c
->name
, argv
, 1, conf
, c
->config_path
, daemonize
);
668 return ret
== 0 ? true : false;
672 if (conf
->init_cmd
) {
673 init_cmd
[0] = conf
->init_cmd
;
682 * say, I'm not sure - what locks do we want here? Any?
683 * Is liblxc's locking enough here to protect the on disk
684 * container? We don't want to exclude things like lxc_info
685 * while container is running...
689 lxc_monitord_spawn(c
->config_path
);
696 /* Set to NULL because we don't want father unlink
697 * the PID file, child will do the free and unlink.
700 return wait_on_daemonized_start(c
, pid
);
703 /* We don't really care if this doesn't print all the
704 * characters; all that it means is that the proctitle will be
705 * ugly. Similarly, we also don't care if setproctitle()
707 snprintf(title
, sizeof(title
), "[lxc monitor] %s %s", c
->config_path
, c
->name
);
708 INFO("Attempting to set proc title to %s", title
);
711 /* second fork to be reparented by init */
714 SYSERROR("Error doing dual-fork");
719 /* like daemon(), chdir to / and redirect 0,1,2 to /dev/null */
721 SYSERROR("Error chdir()ing to /.");
724 lxc_check_inherited(conf
, true, -1);
728 open("/dev/zero", O_RDONLY
);
729 open("/dev/null", O_RDWR
);
730 open("/dev/null", O_RDWR
);
733 if (!am_single_threaded()) {
734 ERROR("Cannot start non-daemonized container when threaded");
739 /* We need to write PID file after daeminize, so we always
740 * write the right PID.
743 pid_fp
= fopen(c
->pidfile
, "w");
744 if (pid_fp
== NULL
) {
745 SYSERROR("Failed to create pidfile '%s' for '%s'",
746 c
->pidfile
, c
->name
);
750 if (fprintf(pid_fp
, "%d\n", getpid()) < 0) {
751 SYSERROR("Failed to write '%s'", c
->pidfile
);
764 if (lxc_check_inherited(conf
, daemonize
, -1)) {
765 ERROR("Inherited fds found");
770 ret
= lxc_start(c
->name
, argv
, conf
, c
->config_path
, daemonize
);
774 INFO("container requested reboot");
787 exit (ret
== 0 ? true : false);
789 return (ret
== 0 ? true : false);
792 static bool lxcapi_start(struct lxc_container
*c
, int useinit
, char * const argv
[])
795 current_config
= c
? c
->lxc_conf
: NULL
;
796 ret
= do_lxcapi_start(c
, useinit
, argv
);
797 current_config
= NULL
;
802 * note there MUST be an ending NULL
804 static bool lxcapi_startl(struct lxc_container
*c
, int useinit
, ...)
807 char **inargs
= NULL
;
810 /* container exists */
814 current_config
= c
->lxc_conf
;
816 va_start(ap
, useinit
);
817 inargs
= lxc_va_arg_list_to_argv(ap
, 0, 1);
821 ERROR("Memory allocation error.");
825 /* pass NULL if no arguments were supplied */
826 bret
= do_lxcapi_start(c
, useinit
, *inargs
? inargs
: NULL
);
831 for (arg
= inargs
; *arg
; arg
++)
836 current_config
= NULL
;
840 static bool do_lxcapi_stop(struct lxc_container
*c
)
847 ret
= lxc_cmd_stop(c
->name
, c
->config_path
);
852 WRAP_API(bool, lxcapi_stop
)
854 static int do_create_container_dir(const char *path
, struct lxc_conf
*conf
)
856 int ret
= -1, lasterr
;
857 char *p
= alloca(strlen(path
)+1);
858 mode_t mask
= umask(0002);
859 ret
= mkdir(path
, 0770);
867 SYSERROR("failed to create container path %s", path
);
872 if (!lxc_list_empty(&conf
->id_map
) && chown_mapped_root(p
, conf
) != 0) {
873 ERROR("Failed to chown container dir");
880 * create the standard expected container dir
882 static bool create_container_dir(struct lxc_container
*c
)
887 len
= strlen(c
->config_path
) + strlen(c
->name
) + 2;
891 ret
= snprintf(s
, len
, "%s/%s", c
->config_path
, c
->name
);
892 if (ret
< 0 || ret
>= len
) {
896 ret
= do_create_container_dir(s
, c
->lxc_conf
);
902 * do_bdev_create: thin wrapper around bdev_create(). Like bdev_create(),
903 * it returns a mounted bdev on success, NULL on error.
905 static struct bdev
*do_bdev_create(struct lxc_container
*c
, const char *type
,
906 struct bdev_specs
*specs
)
913 /* rootfs.path or lxcpath/lxcname/rootfs */
914 if (c
->lxc_conf
->rootfs
.path
&& access(c
->lxc_conf
->rootfs
.path
, F_OK
) == 0) {
915 const char *rpath
= c
->lxc_conf
->rootfs
.path
;
916 len
= strlen(rpath
) + 1;
918 ret
= snprintf(dest
, len
, "%s", rpath
);
920 const char *lxcpath
= do_lxcapi_get_config_path(c
);
921 len
= strlen(c
->name
) + strlen(lxcpath
) + 9;
923 ret
= snprintf(dest
, len
, "%s/%s/rootfs", lxcpath
, c
->name
);
925 if (ret
< 0 || ret
>= len
)
928 bdev
= bdev_create(dest
, type
, c
->name
, specs
);
930 ERROR("Failed to create backing store type %s", type
);
934 do_lxcapi_set_config_item(c
, "lxc.rootfs", bdev
->src
);
936 /* if we are not root, chown the rootfs dir to root in the
939 if (geteuid() != 0 || (c
->lxc_conf
&& !lxc_list_empty(&c
->lxc_conf
->id_map
))) {
940 if (chown_mapped_root(bdev
->dest
, c
->lxc_conf
) < 0) {
941 ERROR("Error chowning %s to container root", bdev
->dest
);
942 suggest_default_idmap();
951 static char *lxcbasename(char *path
)
953 char *p
= path
+ strlen(path
) - 1;
954 while (*p
!= '/' && p
> path
)
959 static bool create_run_template(struct lxc_container
*c
, char *tpath
, bool quiet
,
969 SYSERROR("failed to fork task for container creation template");
973 if (pid
== 0) { // child
974 char *patharg
, *namearg
, *rootfsarg
, *src
;
975 struct bdev
*bdev
= NULL
;
977 int ret
, len
, nargs
= 0;
979 struct lxc_conf
*conf
= c
->lxc_conf
;
985 open("/dev/zero", O_RDONLY
);
986 open("/dev/null", O_RDWR
);
987 open("/dev/null", O_RDWR
);
990 src
= c
->lxc_conf
->rootfs
.path
;
992 * for an overlay create, what the user wants is the template to fill
993 * in what will become the readonly lower layer. So don't mount for
996 if (strncmp(src
, "overlayfs:", 10) == 0)
997 src
= overlay_getlower(src
+10);
998 if (strncmp(src
, "aufs:", 5) == 0)
999 src
= overlay_getlower(src
+5);
1001 bdev
= bdev_init(c
->lxc_conf
, src
, c
->lxc_conf
->rootfs
.mount
, NULL
);
1003 ERROR("Error opening rootfs");
1007 if (geteuid() == 0) {
1008 if (unshare(CLONE_NEWNS
) < 0) {
1009 ERROR("error unsharing mounts");
1012 if (detect_shared_rootfs()) {
1013 if (mount(NULL
, "/", NULL
, MS_SLAVE
|MS_REC
, NULL
)) {
1014 SYSERROR("Failed to make / rslave to run template");
1015 ERROR("Continuing...");
1019 if (strcmp(bdev
->type
, "dir") && strcmp(bdev
->type
, "btrfs")) {
1020 if (geteuid() != 0) {
1021 ERROR("non-root users can only create btrfs and directory-backed containers");
1024 if (bdev
->ops
->mount(bdev
) < 0) {
1025 ERROR("Error mounting rootfs");
1028 } else { // TODO come up with a better way here!
1030 bdev
->dest
= strdup(bdev
->src
);
1034 * create our new array, pre-pend the template name and
1038 for (nargs
= 0; argv
[nargs
]; nargs
++) ;
1039 nargs
+= 4; // template, path, rootfs and name args
1041 newargv
= malloc(nargs
* sizeof(*newargv
));
1044 newargv
[0] = lxcbasename(tpath
);
1046 len
= strlen(c
->config_path
) + strlen(c
->name
) + strlen("--path=") + 2;
1047 patharg
= malloc(len
);
1050 ret
= snprintf(patharg
, len
, "--path=%s/%s", c
->config_path
, c
->name
);
1051 if (ret
< 0 || ret
>= len
)
1053 newargv
[1] = patharg
;
1054 len
= strlen("--name=") + strlen(c
->name
) + 1;
1055 namearg
= malloc(len
);
1058 ret
= snprintf(namearg
, len
, "--name=%s", c
->name
);
1059 if (ret
< 0 || ret
>= len
)
1061 newargv
[2] = namearg
;
1063 len
= strlen("--rootfs=") + 1 + strlen(bdev
->dest
);
1064 rootfsarg
= malloc(len
);
1067 ret
= snprintf(rootfsarg
, len
, "--rootfs=%s", bdev
->dest
);
1068 if (ret
< 0 || ret
>= len
)
1070 newargv
[3] = rootfsarg
;
1072 /* add passed-in args */
1074 for (i
= 4; i
< nargs
; i
++)
1075 newargv
[i
] = argv
[i
-4];
1077 /* add trailing NULL */
1079 newargv
= realloc(newargv
, nargs
* sizeof(*newargv
));
1082 newargv
[nargs
- 1] = NULL
;
1085 * If we're running the template in a mapped userns, then
1086 * we prepend the template command with:
1087 * lxc-usernsexec <-m map1> ... <-m mapn> --
1088 * and we append "--mapped-uid x", where x is the mapped uid
1091 if (!lxc_list_empty(&conf
->id_map
)) {
1095 char **n2
= malloc(n2args
* sizeof(*n2
));
1096 struct lxc_list
*it
;
1100 SYSERROR("out of memory");
1104 tpath
= "lxc-usernsexec";
1105 n2
[0] = "lxc-usernsexec";
1106 lxc_list_for_each(it
, &conf
->id_map
) {
1109 n2
= realloc(n2
, n2args
* sizeof(char *));
1112 n2
[n2args
-2] = "-m";
1113 n2
[n2args
-1] = malloc(200);
1116 ret
= snprintf(n2
[n2args
-1], 200, "%c:%lu:%lu:%lu",
1117 map
->idtype
== ID_TYPE_UID
? 'u' : 'g',
1118 map
->nsid
, map
->hostid
, map
->range
);
1119 if (ret
< 0 || ret
>= 200)
1122 int hostid_mapped
= mapped_hostid(geteuid(), conf
, ID_TYPE_UID
);
1123 int extraargs
= hostid_mapped
>= 0 ? 1 : 3;
1124 n2
= realloc(n2
, (nargs
+ n2args
+ extraargs
) * sizeof(char *));
1127 if (hostid_mapped
< 0) {
1128 hostid_mapped
= find_unmapped_nsuid(conf
, ID_TYPE_UID
);
1129 n2
[n2args
++] = "-m";
1130 if (hostid_mapped
< 0) {
1131 ERROR("Could not find free uid to map");
1134 n2
[n2args
++] = malloc(200);
1135 if (!n2
[n2args
-1]) {
1136 SYSERROR("out of memory");
1139 ret
= snprintf(n2
[n2args
-1], 200, "u:%d:%d:1",
1140 hostid_mapped
, geteuid());
1141 if (ret
< 0 || ret
>= 200) {
1142 ERROR("string too long");
1146 int hostgid_mapped
= mapped_hostid(getegid(), conf
, ID_TYPE_GID
);
1147 extraargs
= hostgid_mapped
>= 0 ? 1 : 3;
1148 n2
= realloc(n2
, (nargs
+ n2args
+ extraargs
) * sizeof(char *));
1151 if (hostgid_mapped
< 0) {
1152 hostgid_mapped
= find_unmapped_nsuid(conf
, ID_TYPE_GID
);
1153 n2
[n2args
++] = "-m";
1154 if (hostgid_mapped
< 0) {
1155 ERROR("Could not find free uid to map");
1158 n2
[n2args
++] = malloc(200);
1159 if (!n2
[n2args
-1]) {
1160 SYSERROR("out of memory");
1163 ret
= snprintf(n2
[n2args
-1], 200, "g:%d:%d:1",
1164 hostgid_mapped
, getegid());
1165 if (ret
< 0 || ret
>= 200) {
1166 ERROR("string too long");
1170 n2
[n2args
++] = "--";
1171 for (i
= 0; i
< nargs
; i
++)
1172 n2
[i
+ n2args
] = newargv
[i
];
1174 // Finally add "--mapped-uid $uid" to tell template what to chown
1177 n2
= realloc(n2
, n2args
* sizeof(char *));
1179 SYSERROR("out of memory");
1182 // note n2[n2args-1] is NULL
1183 n2
[n2args
-5] = "--mapped-uid";
1184 snprintf(txtuid
, 20, "%d", hostid_mapped
);
1185 n2
[n2args
-4] = txtuid
;
1186 n2
[n2args
-3] = "--mapped-gid";
1187 snprintf(txtgid
, 20, "%d", hostgid_mapped
);
1188 n2
[n2args
-2] = txtgid
;
1189 n2
[n2args
-1] = NULL
;
1194 execvp(tpath
, newargv
);
1195 SYSERROR("failed to execute template %s", tpath
);
1199 if (wait_for_pid(pid
) != 0) {
1200 ERROR("container creation template for %s failed", c
->name
);
1207 static bool prepend_lxc_header(char *path
, const char *t
, char *const argv
[])
1215 unsigned char md_value
[SHA_DIGEST_LENGTH
];
1219 f
= fopen(path
, "r");
1223 if (fseek(f
, 0, SEEK_END
) < 0)
1225 if ((flen
= ftell(f
)) < 0)
1227 if (fseek(f
, 0, SEEK_SET
) < 0)
1229 if ((contents
= malloc(flen
+ 1)) == NULL
)
1231 if (fread(contents
, 1, flen
, f
) != flen
)
1232 goto out_free_contents
;
1234 contents
[flen
] = '\0';
1238 goto out_free_contents
;
1241 tpath
= get_template_path(t
);
1243 ERROR("bad template: %s", t
);
1244 goto out_free_contents
;
1247 ret
= sha1sum_file(tpath
, md_value
);
1249 ERROR("Error getting sha1sum of %s", tpath
);
1251 goto out_free_contents
;
1256 f
= fopen(path
, "w");
1258 SYSERROR("reopening config for writing");
1262 fprintf(f
, "# Template used to create this container: %s\n", t
);
1264 fprintf(f
, "# Parameters passed to the template:");
1266 fprintf(f
, " %s", *argv
);
1272 fprintf(f
, "# Template script checksum (SHA-1): ");
1273 for (i
=0; i
<SHA_DIGEST_LENGTH
; i
++)
1274 fprintf(f
, "%02x", md_value
[i
]);
1277 fprintf(f
, "# For additional config options, please look at lxc.container.conf(5)\n");
1278 if (fwrite(contents
, 1, flen
, f
) != flen
) {
1279 SYSERROR("Writing original contents");
1295 SYSERROR("Error prepending header");
1301 static void lxcapi_clear_config(struct lxc_container
*c
)
1305 lxc_conf_free(c
->lxc_conf
);
1311 #define do_lxcapi_clear_config(c) lxcapi_clear_config(c)
1315 * create a container with the given parameters.
1316 * @c: container to be created. It has the lxcpath, name, and a starting
1317 * configuration already set
1318 * @t: the template to execute to instantiate the root filesystem and
1319 * adjust the configuration.
1320 * @bdevtype: backing store type to use. If NULL, dir will be used.
1321 * @specs: additional parameters for the backing store, i.e. LVM vg to
1324 * @argv: the arguments to pass to the template, terminated by NULL. If no
1325 * arguments, you can just pass NULL.
1327 static bool do_lxcapi_create(struct lxc_container
*c
, const char *t
,
1328 const char *bdevtype
, struct bdev_specs
*specs
, int flags
,
1340 tpath
= get_template_path(t
);
1342 ERROR("bad template: %s", t
);
1348 * If a template is passed in, and the rootfs already is defined in
1349 * the container config and exists, then * caller is trying to create
1350 * an existing container. Return an error, but do NOT delete the
1353 if (do_lxcapi_is_defined(c
) && c
->lxc_conf
&& c
->lxc_conf
->rootfs
.path
&&
1354 access(c
->lxc_conf
->rootfs
.path
, F_OK
) == 0 && tpath
) {
1355 ERROR("Container %s:%s already exists", c
->config_path
, c
->name
);
1360 if (!do_lxcapi_load_config(c
, lxc_global_config_value("lxc.default_config"))) {
1361 ERROR("Error loading default configuration file %s", lxc_global_config_value("lxc.default_config"));
1366 if (!create_container_dir(c
))
1370 * either template or rootfs.path should be set.
1371 * if both template and rootfs.path are set, template is setup as rootfs.path.
1372 * container is already created if we have a config and rootfs.path is accessible
1374 if (!c
->lxc_conf
->rootfs
.path
&& !tpath
)
1375 /* no template passed in and rootfs does not exist: error */
1377 if (c
->lxc_conf
->rootfs
.path
&& access(c
->lxc_conf
->rootfs
.path
, F_OK
) != 0)
1378 /* rootfs passed into configuration, but does not exist: error */
1380 if (do_lxcapi_is_defined(c
) && c
->lxc_conf
->rootfs
.path
&& !tpath
) {
1381 /* Rootfs already existed, user just wanted to save the
1382 * loaded configuration */
1387 /* Mark that this container is being created */
1388 if ((partial_fd
= create_partial(c
)) < 0)
1391 /* no need to get disk lock bc we have the partial locked */
1394 * Create the backing store
1395 * Note we can't do this in the same task as we use to execute the
1396 * template because of the way zfs works.
1397 * After you 'zfs create', zfs mounts the fs only in the initial
1402 SYSERROR("failed to fork task for container creation template");
1406 if (pid
== 0) { // child
1407 struct bdev
*bdev
= NULL
;
1409 if (!(bdev
= do_bdev_create(c
, bdevtype
, specs
))) {
1410 ERROR("Error creating backing store type %s for %s",
1411 bdevtype
? bdevtype
: "(none)", c
->name
);
1415 /* save config file again to store the new rootfs location */
1416 if (!do_lxcapi_save_config(c
, NULL
)) {
1417 ERROR("failed to save starting configuration for %s", c
->name
);
1418 // parent task won't see bdev in config so we delete it
1419 bdev
->ops
->umount(bdev
);
1420 bdev
->ops
->destroy(bdev
);
1425 if (wait_for_pid(pid
) != 0)
1428 /* reload config to get the rootfs */
1429 lxc_conf_free(c
->lxc_conf
);
1431 if (!load_config_locked(c
, c
->configfile
))
1434 if (!create_run_template(c
, tpath
, !!(flags
& LXC_CREATE_QUIET
), argv
))
1437 // now clear out the lxc_conf we have, reload from the created
1439 do_lxcapi_clear_config(c
);
1442 if (!prepend_lxc_header(c
->configfile
, tpath
, argv
)) {
1443 ERROR("Error prepending header to configuration file");
1447 ret
= load_config_locked(c
, c
->configfile
);
1450 if (partial_fd
>= 0)
1451 remove_partial(c
, partial_fd
);
1454 container_destroy(c
);
1460 static bool lxcapi_create(struct lxc_container
*c
, const char *t
,
1461 const char *bdevtype
, struct bdev_specs
*specs
, int flags
,
1465 current_config
= c
? c
->lxc_conf
: NULL
;
1466 ret
= do_lxcapi_create(c
, t
, bdevtype
, specs
, flags
, argv
);
1467 current_config
= NULL
;
1471 static bool do_lxcapi_reboot(struct lxc_container
*c
)
1474 int rebootsignal
= SIGINT
;
1478 if (!do_lxcapi_is_running(c
))
1480 pid
= do_lxcapi_init_pid(c
);
1483 if (c
->lxc_conf
&& c
->lxc_conf
->rebootsignal
)
1484 rebootsignal
= c
->lxc_conf
->rebootsignal
;
1485 if (kill(pid
, rebootsignal
) < 0)
1491 WRAP_API(bool, lxcapi_reboot
)
1493 static bool do_lxcapi_shutdown(struct lxc_container
*c
, int timeout
)
1497 int haltsignal
= SIGPWR
;
1502 if (!do_lxcapi_is_running(c
))
1504 pid
= do_lxcapi_init_pid(c
);
1507 if (c
->lxc_conf
&& c
->lxc_conf
->haltsignal
)
1508 haltsignal
= c
->lxc_conf
->haltsignal
;
1509 kill(pid
, haltsignal
);
1510 retv
= do_lxcapi_wait(c
, "STOPPED", timeout
);
1514 WRAP_API_1(bool, lxcapi_shutdown
, int)
1516 static bool lxcapi_createl(struct lxc_container
*c
, const char *t
,
1517 const char *bdevtype
, struct bdev_specs
*specs
, int flags
, ...)
1526 current_config
= c
->lxc_conf
;
1529 * since we're going to wait for create to finish, I don't think we
1530 * need to get a copy of the arguments.
1532 va_start(ap
, flags
);
1533 args
= lxc_va_arg_list_to_argv(ap
, 0, 0);
1536 ERROR("Memory allocation error.");
1540 bret
= do_lxcapi_create(c
, t
, bdevtype
, specs
, flags
, args
);
1544 current_config
= NULL
;
1548 static void do_clear_unexp_config_line(struct lxc_conf
*conf
, const char *key
)
1550 if (strcmp(key
, "lxc.cgroup") == 0)
1551 clear_unexp_config_line(conf
, key
, true);
1552 else if (strcmp(key
, "lxc.network") == 0)
1553 clear_unexp_config_line(conf
, key
, true);
1554 else if (strcmp(key
, "lxc.hook") == 0)
1555 clear_unexp_config_line(conf
, key
, true);
1557 clear_unexp_config_line(conf
, key
, false);
1558 if (!do_append_unexp_config_line(conf
, key
, ""))
1559 WARN("Error clearing configuration for %s", key
);
1562 static bool do_lxcapi_clear_config_item(struct lxc_container
*c
, const char *key
)
1566 if (!c
|| !c
->lxc_conf
)
1568 if (container_mem_lock(c
))
1570 ret
= lxc_clear_config_item(c
->lxc_conf
, key
);
1572 do_clear_unexp_config_line(c
->lxc_conf
, key
);
1573 container_mem_unlock(c
);
1577 WRAP_API_1(bool, lxcapi_clear_config_item
, const char *)
1579 static inline bool enter_net_ns(struct lxc_container
*c
)
1581 pid_t pid
= do_lxcapi_init_pid(c
);
1583 if ((geteuid() != 0 || (c
->lxc_conf
&& !lxc_list_empty(&c
->lxc_conf
->id_map
))) && access("/proc/self/ns/user", F_OK
) == 0) {
1584 if (!switch_to_ns(pid
, "user"))
1587 return switch_to_ns(pid
, "net");
1590 // used by qsort and bsearch functions for comparing names
1591 static inline int string_cmp(char **first
, char **second
)
1593 return strcmp(*first
, *second
);
1596 // used by qsort and bsearch functions for comparing container names
1597 static inline int container_cmp(struct lxc_container
**first
, struct lxc_container
**second
)
1599 return strcmp((*first
)->name
, (*second
)->name
);
1602 static bool add_to_array(char ***names
, char *cname
, int pos
)
1604 char **newnames
= realloc(*names
, (pos
+1) * sizeof(char *));
1606 ERROR("Out of memory");
1611 newnames
[pos
] = strdup(cname
);
1615 // sort the arrray as we will use binary search on it
1616 qsort(newnames
, pos
+ 1, sizeof(char *), (int (*)(const void *,const void *))string_cmp
);
1621 static bool add_to_clist(struct lxc_container
***list
, struct lxc_container
*c
, int pos
, bool sort
)
1623 struct lxc_container
**newlist
= realloc(*list
, (pos
+1) * sizeof(struct lxc_container
*));
1625 ERROR("Out of memory");
1632 // sort the arrray as we will use binary search on it
1634 qsort(newlist
, pos
+ 1, sizeof(struct lxc_container
*), (int (*)(const void *,const void *))container_cmp
);
1639 static char** get_from_array(char ***names
, char *cname
, int size
)
1641 return (char **)bsearch(&cname
, *names
, size
, sizeof(char *), (int (*)(const void *, const void *))string_cmp
);
1645 static bool array_contains(char ***names
, char *cname
, int size
) {
1646 if(get_from_array(names
, cname
, size
) != NULL
)
1651 static bool remove_from_array(char ***names
, char *cname
, int size
)
1653 char **result
= get_from_array(names
, cname
, size
);
1654 if (result
!= NULL
) {
1661 static char ** do_lxcapi_get_interfaces(struct lxc_container
*c
)
1664 int i
, count
= 0, pipefd
[2];
1665 char **interfaces
= NULL
;
1666 char interface
[IFNAMSIZ
];
1668 if(pipe(pipefd
) < 0) {
1669 SYSERROR("pipe failed");
1675 SYSERROR("failed to fork task to get interfaces information");
1681 if (pid
== 0) { // child
1682 int ret
= 1, nbytes
;
1683 struct ifaddrs
*interfaceArray
= NULL
, *tempIfAddr
= NULL
;
1685 /* close the read-end of the pipe */
1688 if (!enter_net_ns(c
)) {
1689 SYSERROR("failed to enter namespace");
1693 /* Grab the list of interfaces */
1694 if (getifaddrs(&interfaceArray
)) {
1695 SYSERROR("failed to get interfaces list");
1699 /* Iterate through the interfaces */
1700 for (tempIfAddr
= interfaceArray
; tempIfAddr
!= NULL
; tempIfAddr
= tempIfAddr
->ifa_next
) {
1701 nbytes
= write(pipefd
[1], tempIfAddr
->ifa_name
, IFNAMSIZ
);
1703 ERROR("write failed");
1712 freeifaddrs(interfaceArray
);
1714 /* close the write-end of the pipe, thus sending EOF to the reader */
1719 /* close the write-end of the pipe */
1722 while (read(pipefd
[0], &interface
, IFNAMSIZ
) == IFNAMSIZ
) {
1723 if (array_contains(&interfaces
, interface
, count
))
1726 if(!add_to_array(&interfaces
, interface
, count
))
1727 ERROR("PARENT: add_to_array failed");
1731 if (wait_for_pid(pid
) != 0) {
1732 for(i
=0;i
<count
;i
++)
1733 free(interfaces
[i
]);
1738 /* close the read-end of the pipe */
1741 /* Append NULL to the array */
1743 interfaces
= (char **)lxc_append_null_to_array((void **)interfaces
, count
);
1748 WRAP_API(char **, lxcapi_get_interfaces
)
1750 static char** do_lxcapi_get_ips(struct lxc_container
*c
, const char* interface
, const char* family
, int scope
)
1753 int i
, count
= 0, pipefd
[2];
1754 char **addresses
= NULL
;
1755 char address
[INET6_ADDRSTRLEN
];
1757 if(pipe(pipefd
) < 0) {
1758 SYSERROR("pipe failed");
1764 SYSERROR("failed to fork task to get container ips");
1770 if (pid
== 0) { // child
1771 int ret
= 1, nbytes
;
1772 struct ifaddrs
*interfaceArray
= NULL
, *tempIfAddr
= NULL
;
1773 char addressOutputBuffer
[INET6_ADDRSTRLEN
];
1774 void *tempAddrPtr
= NULL
;
1775 char *address
= NULL
;
1777 /* close the read-end of the pipe */
1780 if (!enter_net_ns(c
)) {
1781 SYSERROR("failed to enter namespace");
1785 /* Grab the list of interfaces */
1786 if (getifaddrs(&interfaceArray
)) {
1787 SYSERROR("failed to get interfaces list");
1791 /* Iterate through the interfaces */
1792 for (tempIfAddr
= interfaceArray
; tempIfAddr
!= NULL
; tempIfAddr
= tempIfAddr
->ifa_next
) {
1793 if (tempIfAddr
->ifa_addr
== NULL
)
1796 if(tempIfAddr
->ifa_addr
->sa_family
== AF_INET
) {
1797 if (family
&& strcmp(family
, "inet"))
1799 tempAddrPtr
= &((struct sockaddr_in
*)tempIfAddr
->ifa_addr
)->sin_addr
;
1802 if (family
&& strcmp(family
, "inet6"))
1805 if (((struct sockaddr_in6
*)tempIfAddr
->ifa_addr
)->sin6_scope_id
!= scope
)
1808 tempAddrPtr
= &((struct sockaddr_in6
*)tempIfAddr
->ifa_addr
)->sin6_addr
;
1811 if (interface
&& strcmp(interface
, tempIfAddr
->ifa_name
))
1813 else if (!interface
&& strcmp("lo", tempIfAddr
->ifa_name
) == 0)
1816 address
= (char *)inet_ntop(tempIfAddr
->ifa_addr
->sa_family
,
1818 addressOutputBuffer
,
1819 sizeof(addressOutputBuffer
));
1823 nbytes
= write(pipefd
[1], address
, INET6_ADDRSTRLEN
);
1825 ERROR("write failed");
1834 freeifaddrs(interfaceArray
);
1836 /* close the write-end of the pipe, thus sending EOF to the reader */
1841 /* close the write-end of the pipe */
1844 while (read(pipefd
[0], &address
, INET6_ADDRSTRLEN
) == INET6_ADDRSTRLEN
) {
1845 if(!add_to_array(&addresses
, address
, count
))
1846 ERROR("PARENT: add_to_array failed");
1850 if (wait_for_pid(pid
) != 0) {
1851 for(i
=0;i
<count
;i
++)
1857 /* close the read-end of the pipe */
1860 /* Append NULL to the array */
1862 addresses
= (char **)lxc_append_null_to_array((void **)addresses
, count
);
1867 WRAP_API_3(char **, lxcapi_get_ips
, const char *, const char *, int)
1869 static int do_lxcapi_get_config_item(struct lxc_container
*c
, const char *key
, char *retv
, int inlen
)
1873 if (!c
|| !c
->lxc_conf
)
1875 if (container_mem_lock(c
))
1877 ret
= lxc_get_config_item(c
->lxc_conf
, key
, retv
, inlen
);
1878 container_mem_unlock(c
);
1882 WRAP_API_3(int, lxcapi_get_config_item
, const char *, char *, int)
1884 static char* do_lxcapi_get_running_config_item(struct lxc_container
*c
, const char *key
)
1888 if (!c
|| !c
->lxc_conf
)
1890 if (container_mem_lock(c
))
1892 ret
= lxc_cmd_get_config_item(c
->name
, key
, do_lxcapi_get_config_path(c
));
1893 container_mem_unlock(c
);
1897 WRAP_API_1(char *, lxcapi_get_running_config_item
, const char *)
1899 static int do_lxcapi_get_keys(struct lxc_container
*c
, const char *key
, char *retv
, int inlen
)
1902 return lxc_listconfigs(retv
, inlen
);
1904 * Support 'lxc.network.<idx>', i.e. 'lxc.network.0'
1905 * This is an intelligent result to show which keys are valid given
1906 * the type of nic it is
1908 if (!c
|| !c
->lxc_conf
)
1910 if (container_mem_lock(c
))
1913 if (strncmp(key
, "lxc.network.", 12) == 0)
1914 ret
= lxc_list_nicconfigs(c
->lxc_conf
, key
, retv
, inlen
);
1915 container_mem_unlock(c
);
1919 WRAP_API_3(int, lxcapi_get_keys
, const char *, char *, int)
1921 static bool do_lxcapi_save_config(struct lxc_container
*c
, const char *alt_file
)
1924 bool ret
= false, need_disklock
= false;
1928 alt_file
= c
->configfile
;
1930 return false; // should we write to stdout if no file is specified?
1932 // If we haven't yet loaded a config, load the stock config
1934 if (!do_lxcapi_load_config(c
, lxc_global_config_value("lxc.default_config"))) {
1935 ERROR("Error loading default configuration file %s while saving %s", lxc_global_config_value("lxc.default_config"), c
->name
);
1940 if (!create_container_dir(c
))
1944 * If we're writing to the container's config file, take the
1945 * disk lock. Otherwise just take the memlock to protect the
1946 * struct lxc_container while we're traversing it.
1948 if (strcmp(c
->configfile
, alt_file
) == 0)
1949 need_disklock
= true;
1952 lret
= container_disk_lock(c
);
1954 lret
= container_mem_lock(c
);
1959 fout
= fopen(alt_file
, "w");
1962 write_config(fout
, c
->lxc_conf
);
1968 container_disk_unlock(c
);
1970 container_mem_unlock(c
);
1974 WRAP_API_1(bool, lxcapi_save_config
, const char *)
1976 static bool mod_rdep(struct lxc_container
*c
, bool inc
)
1978 char path
[MAXPATHLEN
];
1983 if (container_disk_lock(c
))
1985 ret
= snprintf(path
, MAXPATHLEN
, "%s/%s/lxc_snapshots", c
->config_path
,
1987 if (ret
< 0 || ret
> MAXPATHLEN
)
1989 f
= fopen(path
, "r");
1991 ret
= fscanf(f
, "%d", &v
);
1994 ERROR("Corrupted file %s", path
);
1999 f
= fopen(path
, "w");
2002 if (fprintf(f
, "%d\n", v
) < 0) {
2003 ERROR("Error writing new snapshots value");
2009 SYSERROR("Error writing to or closing snapshots file");
2016 container_disk_unlock(c
);
2020 static void strip_newline(char *p
)
2022 size_t len
= strlen(p
);
2025 if (p
[len
-1] == '\n')
2029 static void mod_all_rdeps(struct lxc_container
*c
, bool inc
)
2031 struct lxc_container
*p
;
2032 char *lxcpath
= NULL
, *lxcname
= NULL
, path
[MAXPATHLEN
];
2033 size_t pathlen
= 0, namelen
= 0;
2037 ret
= snprintf(path
, MAXPATHLEN
, "%s/%s/lxc_rdepends",
2038 c
->config_path
, c
->name
);
2039 if (ret
< 0 || ret
>= MAXPATHLEN
) {
2040 ERROR("Path name too long");
2043 f
= fopen(path
, "r");
2046 while (getline(&lxcpath
, &pathlen
, f
) != -1) {
2047 if (getline(&lxcname
, &namelen
, f
) == -1) {
2048 ERROR("badly formatted file %s", path
);
2051 strip_newline(lxcpath
);
2052 strip_newline(lxcname
);
2053 if ((p
= lxc_container_new(lxcname
, lxcpath
)) == NULL
) {
2054 ERROR("Unable to find dependent container %s:%s",
2058 if (!mod_rdep(p
, inc
))
2059 ERROR("Failed to increase numsnapshots for %s:%s",
2061 lxc_container_put(p
);
2069 static bool has_fs_snapshots(struct lxc_container
*c
)
2071 char path
[MAXPATHLEN
];
2076 ret
= snprintf(path
, MAXPATHLEN
, "%s/%s/lxc_snapshots", c
->config_path
,
2078 if (ret
< 0 || ret
> MAXPATHLEN
)
2080 f
= fopen(path
, "r");
2083 ret
= fscanf(f
, "%d", &v
);
2093 static bool has_snapshots(struct lxc_container
*c
)
2095 char path
[MAXPATHLEN
];
2096 struct dirent dirent
, *direntp
;
2100 if (!get_snappath_dir(c
, path
))
2102 dir
= opendir(path
);
2105 while (!readdir_r(dir
, &dirent
, &direntp
)) {
2109 if (!strcmp(direntp
->d_name
, "."))
2112 if (!strcmp(direntp
->d_name
, ".."))
2121 static int lxc_rmdir_onedev_wrapper(void *data
)
2123 char *arg
= (char *) data
;
2124 return lxc_rmdir_onedev(arg
, "snaps");
2127 static int do_bdev_destroy(struct lxc_conf
*conf
)
2132 r
= bdev_init(conf
, conf
->rootfs
.path
, conf
->rootfs
.mount
, NULL
);
2136 if (r
->ops
->destroy(r
) < 0)
2142 static int bdev_destroy_wrapper(void *data
)
2144 struct lxc_conf
*conf
= data
;
2146 if (setgid(0) < 0) {
2147 ERROR("Failed to setgid to 0");
2150 if (setgroups(0, NULL
) < 0)
2151 WARN("Failed to clear groups");
2152 if (setuid(0) < 0) {
2153 ERROR("Failed to setuid to 0");
2156 return do_bdev_destroy(conf
);
2159 static bool container_destroy(struct lxc_container
*c
)
2163 struct lxc_conf
*conf
= c
->lxc_conf
;
2165 if (!c
|| !do_lxcapi_is_defined(c
))
2168 if (container_disk_lock(c
))
2171 if (!is_stopped(c
)) {
2172 // we should queue some sort of error - in c->error_string?
2173 ERROR("container %s is not stopped", c
->name
);
2177 if (!lxc_list_empty(&conf
->hooks
[LXCHOOK_DESTROY
])) {
2178 /* Start of environment variable setup for hooks */
2179 if (setenv("LXC_NAME", c
->name
, 1)) {
2180 SYSERROR("failed to set environment variable for container name");
2182 if (setenv("LXC_CONFIG_FILE", conf
->rcfile
, 1)) {
2183 SYSERROR("failed to set environment variable for config path");
2185 if (setenv("LXC_ROOTFS_MOUNT", conf
->rootfs
.mount
, 1)) {
2186 SYSERROR("failed to set environment variable for rootfs mount");
2188 if (setenv("LXC_ROOTFS_PATH", conf
->rootfs
.path
, 1)) {
2189 SYSERROR("failed to set environment variable for rootfs mount");
2191 if (conf
->console
.path
&& setenv("LXC_CONSOLE", conf
->console
.path
, 1)) {
2192 SYSERROR("failed to set environment variable for console path");
2194 if (conf
->console
.log_path
&& setenv("LXC_CONSOLE_LOGPATH", conf
->console
.log_path
, 1)) {
2195 SYSERROR("failed to set environment variable for console log");
2197 /* End of environment variable setup for hooks */
2199 if (run_lxc_hooks(c
->name
, "destroy", conf
, c
->get_config_path(c
), NULL
)) {
2200 ERROR("Error executing clone hook for %s", c
->name
);
2205 if (current_config
&& conf
== current_config
) {
2206 current_config
= NULL
;
2207 if (conf
->logfd
!= -1) {
2213 if (conf
&& conf
->rootfs
.path
&& conf
->rootfs
.mount
) {
2215 ret
= userns_exec_1(conf
, bdev_destroy_wrapper
, conf
);
2217 ret
= do_bdev_destroy(conf
);
2219 ERROR("Error destroying rootfs for %s", c
->name
);
2224 mod_all_rdeps(c
, false);
2226 const char *p1
= do_lxcapi_get_config_path(c
);
2227 char *path
= alloca(strlen(p1
) + strlen(c
->name
) + 2);
2228 sprintf(path
, "%s/%s", p1
, c
->name
);
2230 ret
= userns_exec_1(conf
, lxc_rmdir_onedev_wrapper
, path
);
2232 ret
= lxc_rmdir_onedev(path
, "snaps");
2234 ERROR("Error destroying container directory for %s", c
->name
);
2240 container_disk_unlock(c
);
2244 static bool do_lxcapi_destroy(struct lxc_container
*c
)
2246 if (!c
|| !lxcapi_is_defined(c
))
2248 if (has_snapshots(c
)) {
2249 ERROR("Container %s has snapshots; not removing", c
->name
);
2253 if (has_fs_snapshots(c
)) {
2254 ERROR("container %s has snapshots on its rootfs", c
->name
);
2258 return container_destroy(c
);
2261 WRAP_API(bool, lxcapi_destroy
)
2263 static bool do_lxcapi_destroy_with_snapshots(struct lxc_container
*c
)
2265 if (!c
|| !lxcapi_is_defined(c
))
2267 if (!lxcapi_snapshot_destroy_all(c
)) {
2268 ERROR("Error deleting all snapshots");
2271 return lxcapi_destroy(c
);
2274 WRAP_API(bool, lxcapi_destroy_with_snapshots
)
2276 static bool set_config_item_locked(struct lxc_container
*c
, const char *key
, const char *v
)
2278 struct lxc_config_t
*config
;
2281 c
->lxc_conf
= lxc_conf_init();
2284 config
= lxc_getconfig(key
);
2287 if (config
->cb(key
, v
, c
->lxc_conf
) != 0)
2289 return do_append_unexp_config_line(c
->lxc_conf
, key
, v
);
2292 static bool do_lxcapi_set_config_item(struct lxc_container
*c
, const char *key
, const char *v
)
2299 if (container_mem_lock(c
))
2302 b
= set_config_item_locked(c
, key
, v
);
2304 container_mem_unlock(c
);
2308 WRAP_API_2(bool, lxcapi_set_config_item
, const char *, const char *)
2310 static char *lxcapi_config_file_name(struct lxc_container
*c
)
2312 if (!c
|| !c
->configfile
)
2314 return strdup(c
->configfile
);
2317 static const char *lxcapi_get_config_path(struct lxc_container
*c
)
2319 if (!c
|| !c
->config_path
)
2321 return (const char *)(c
->config_path
);
2326 * Just recalculate the c->configfile based on the
2327 * c->config_path, which must be set.
2328 * The lxc_container must be locked or not yet public.
2330 static bool set_config_filename(struct lxc_container
*c
)
2335 if (!c
->config_path
)
2338 /* $lxc_path + "/" + c->name + "/" + "config" + '\0' */
2339 len
= strlen(c
->config_path
) + strlen(c
->name
) + strlen("config") + 3;
2340 newpath
= malloc(len
);
2344 ret
= snprintf(newpath
, len
, "%s/%s/config", c
->config_path
, c
->name
);
2345 if (ret
< 0 || ret
>= len
) {
2346 fprintf(stderr
, "Error printing out config file name\n");
2351 free(c
->configfile
);
2352 c
->configfile
= newpath
;
2357 static bool do_lxcapi_set_config_path(struct lxc_container
*c
, const char *path
)
2361 char *oldpath
= NULL
;
2366 if (container_mem_lock(c
))
2371 ERROR("Out of memory setting new lxc path");
2377 oldpath
= c
->config_path
;
2380 /* Since we've changed the config path, we have to change the
2381 * config file name too */
2382 if (!set_config_filename(c
)) {
2383 ERROR("Out of memory setting new config filename");
2385 free(c
->config_path
);
2386 c
->config_path
= oldpath
;
2391 container_mem_unlock(c
);
2395 WRAP_API_1(bool, lxcapi_set_config_path
, const char *)
2397 static bool do_lxcapi_set_cgroup_item(struct lxc_container
*c
, const char *subsys
, const char *value
)
2407 if (container_disk_lock(c
))
2410 ret
= lxc_cgroup_set(subsys
, value
, c
->name
, c
->config_path
);
2412 container_disk_unlock(c
);
2416 WRAP_API_2(bool, lxcapi_set_cgroup_item
, const char *, const char *)
2418 static int do_lxcapi_get_cgroup_item(struct lxc_container
*c
, const char *subsys
, char *retv
, int inlen
)
2428 if (container_disk_lock(c
))
2431 ret
= lxc_cgroup_get(subsys
, retv
, inlen
, c
->name
, c
->config_path
);
2433 container_disk_unlock(c
);
2437 WRAP_API_3(int, lxcapi_get_cgroup_item
, const char *, char *, int)
2439 const char *lxc_get_global_config_item(const char *key
)
2441 return lxc_global_config_value(key
);
2444 const char *lxc_get_version(void)
2449 static int copy_file(const char *old
, const char *new)
2456 if (file_exists(new)) {
2457 ERROR("copy destination %s exists", new);
2460 ret
= stat(old
, &sbuf
);
2462 INFO("Error stat'ing %s", old
);
2466 in
= open(old
, O_RDONLY
);
2468 SYSERROR("Error opening original file %s", old
);
2471 out
= open(new, O_CREAT
| O_EXCL
| O_WRONLY
, 0644);
2473 SYSERROR("Error opening new file %s", new);
2479 len
= read(in
, buf
, 8096);
2481 SYSERROR("Error reading old file %s", old
);
2486 ret
= write(out
, buf
, len
);
2487 if (ret
< len
) { // should we retry?
2488 SYSERROR("Error: write to new file %s was interrupted", new);
2495 // we set mode, but not owner/group
2496 ret
= chmod(new, sbuf
.st_mode
);
2498 SYSERROR("Error setting mode on %s", new);
2510 static int copyhooks(struct lxc_container
*oldc
, struct lxc_container
*c
)
2513 struct lxc_list
*it
;
2516 len
= strlen(oldc
->config_path
) + strlen(oldc
->name
) + 3;
2517 cpath
= alloca(len
);
2518 ret
= snprintf(cpath
, len
, "%s/%s/", oldc
->config_path
, oldc
->name
);
2519 if (ret
< 0 || ret
>= len
)
2522 for (i
=0; i
<NUM_LXC_HOOKS
; i
++) {
2523 lxc_list_for_each(it
, &c
->lxc_conf
->hooks
[i
]) {
2524 char *hookname
= it
->elem
;
2525 char *fname
= strrchr(hookname
, '/');
2526 char tmppath
[MAXPATHLEN
];
2527 if (!fname
) // relative path - we don't support, but maybe we should
2529 if (strncmp(hookname
, cpath
, len
- 1) != 0) {
2530 // this hook is public - ignore
2533 // copy the script, and change the entry in confile
2534 ret
= snprintf(tmppath
, MAXPATHLEN
, "%s/%s/%s",
2535 c
->config_path
, c
->name
, fname
+1);
2536 if (ret
< 0 || ret
>= MAXPATHLEN
)
2538 ret
= copy_file(it
->elem
, tmppath
);
2542 it
->elem
= strdup(tmppath
);
2544 ERROR("out of memory copying hook path");
2550 if (!clone_update_unexp_hooks(c
->lxc_conf
, oldc
->config_path
,
2551 c
->config_path
, oldc
->name
, c
->name
)) {
2552 ERROR("Error saving new hooks in clone");
2555 do_lxcapi_save_config(c
, NULL
);
2560 static int copy_fstab(struct lxc_container
*oldc
, struct lxc_container
*c
)
2562 char newpath
[MAXPATHLEN
];
2563 char *oldpath
= oldc
->lxc_conf
->fstab
;
2569 clear_unexp_config_line(c
->lxc_conf
, "lxc.mount", false);
2571 char *p
= strrchr(oldpath
, '/');
2574 ret
= snprintf(newpath
, MAXPATHLEN
, "%s/%s%s",
2575 c
->config_path
, c
->name
, p
);
2576 if (ret
< 0 || ret
>= MAXPATHLEN
) {
2577 ERROR("error printing new path for %s", oldpath
);
2580 if (file_exists(newpath
)) {
2581 ERROR("error: fstab file %s exists", newpath
);
2585 if (copy_file(oldpath
, newpath
) < 0) {
2586 ERROR("error: copying %s to %s", oldpath
, newpath
);
2589 free(c
->lxc_conf
->fstab
);
2590 c
->lxc_conf
->fstab
= strdup(newpath
);
2591 if (!c
->lxc_conf
->fstab
) {
2592 ERROR("error: allocating pathname");
2595 if (!do_append_unexp_config_line(c
->lxc_conf
, "lxc.mount", newpath
)) {
2596 ERROR("error saving new lxctab");
2603 static void copy_rdepends(struct lxc_container
*c
, struct lxc_container
*c0
)
2605 char path0
[MAXPATHLEN
], path1
[MAXPATHLEN
];
2608 ret
= snprintf(path0
, MAXPATHLEN
, "%s/%s/lxc_rdepends", c0
->config_path
,
2610 if (ret
< 0 || ret
>= MAXPATHLEN
) {
2611 WARN("Error copying reverse dependencies");
2614 ret
= snprintf(path1
, MAXPATHLEN
, "%s/%s/lxc_rdepends", c
->config_path
,
2616 if (ret
< 0 || ret
>= MAXPATHLEN
) {
2617 WARN("Error copying reverse dependencies");
2620 if (copy_file(path0
, path1
) < 0) {
2621 INFO("Error copying reverse dependencies");
2626 static bool add_rdepends(struct lxc_container
*c
, struct lxc_container
*c0
)
2629 char path
[MAXPATHLEN
];
2633 ret
= snprintf(path
, MAXPATHLEN
, "%s/%s/lxc_rdepends", c
->config_path
,
2635 if (ret
< 0 || ret
>= MAXPATHLEN
)
2637 f
= fopen(path
, "a");
2641 // if anything goes wrong, just return an error
2642 if (fprintf(f
, "%s\n%s\n", c0
->config_path
, c0
->name
) < 0)
2649 static int copy_storage(struct lxc_container
*c0
, struct lxc_container
*c
,
2650 const char *newtype
, int flags
, const char *bdevdata
, uint64_t newsize
)
2655 bdev
= bdev_copy(c0
, c
->name
, c
->config_path
, newtype
, flags
,
2656 bdevdata
, newsize
, &need_rdep
);
2658 ERROR("Error copying storage");
2661 free(c
->lxc_conf
->rootfs
.path
);
2662 c
->lxc_conf
->rootfs
.path
= strdup(bdev
->src
);
2664 if (!c
->lxc_conf
->rootfs
.path
) {
2665 ERROR("Out of memory while setting storage path");
2668 // We will simply append a new lxc.rootfs entry to the unexpanded config
2669 clear_unexp_config_line(c
->lxc_conf
, "lxc.rootfs", false);
2670 if (!do_append_unexp_config_line(c
->lxc_conf
, "lxc.rootfs", c
->lxc_conf
->rootfs
.path
)) {
2671 ERROR("Error saving new rootfs to cloend config");
2674 if (flags
& LXC_CLONE_SNAPSHOT
)
2675 copy_rdepends(c
, c0
);
2677 if (!add_rdepends(c
, c0
))
2678 WARN("Error adding reverse dependency from %s to %s",
2682 mod_all_rdeps(c
, true);
2687 struct clone_update_data
{
2688 struct lxc_container
*c0
;
2689 struct lxc_container
*c1
;
2694 static int clone_update_rootfs(struct clone_update_data
*data
)
2696 struct lxc_container
*c0
= data
->c0
;
2697 struct lxc_container
*c
= data
->c1
;
2698 int flags
= data
->flags
;
2699 char **hookargs
= data
->hookargs
;
2701 char path
[MAXPATHLEN
];
2704 struct lxc_conf
*conf
= c
->lxc_conf
;
2706 /* update hostname in rootfs */
2707 /* we're going to mount, so run in a clean namespace to simplify cleanup */
2709 if (setgid(0) < 0) {
2710 ERROR("Failed to setgid to 0");
2713 if (setuid(0) < 0) {
2714 ERROR("Failed to setuid to 0");
2717 if (setgroups(0, NULL
) < 0)
2718 WARN("Failed to clear groups");
2720 if (unshare(CLONE_NEWNS
) < 0)
2722 bdev
= bdev_init(c
->lxc_conf
, c
->lxc_conf
->rootfs
.path
, c
->lxc_conf
->rootfs
.mount
, NULL
);
2725 if (strcmp(bdev
->type
, "dir") != 0) {
2726 if (unshare(CLONE_NEWNS
) < 0) {
2727 ERROR("error unsharing mounts");
2731 if (detect_shared_rootfs()) {
2732 if (mount(NULL
, "/", NULL
, MS_SLAVE
|MS_REC
, NULL
)) {
2733 SYSERROR("Failed to make / rslave");
2734 ERROR("Continuing...");
2737 if (bdev
->ops
->mount(bdev
) < 0) {
2741 } else { // TODO come up with a better way
2743 bdev
->dest
= strdup(bdev
->src
);
2746 if (!lxc_list_empty(&conf
->hooks
[LXCHOOK_CLONE
])) {
2747 /* Start of environment variable setup for hooks */
2748 if (setenv("LXC_SRC_NAME", c0
->name
, 1)) {
2749 SYSERROR("failed to set environment variable for source container name");
2751 if (setenv("LXC_NAME", c
->name
, 1)) {
2752 SYSERROR("failed to set environment variable for container name");
2754 if (setenv("LXC_CONFIG_FILE", conf
->rcfile
, 1)) {
2755 SYSERROR("failed to set environment variable for config path");
2757 if (setenv("LXC_ROOTFS_MOUNT", bdev
->dest
, 1)) {
2758 SYSERROR("failed to set environment variable for rootfs mount");
2760 if (setenv("LXC_ROOTFS_PATH", conf
->rootfs
.path
, 1)) {
2761 SYSERROR("failed to set environment variable for rootfs mount");
2764 if (run_lxc_hooks(c
->name
, "clone", conf
, c
->get_config_path(c
), hookargs
)) {
2765 ERROR("Error executing clone hook for %s", c
->name
);
2771 if (!(flags
& LXC_CLONE_KEEPNAME
)) {
2772 ret
= snprintf(path
, MAXPATHLEN
, "%s/etc/hostname", bdev
->dest
);
2775 if (ret
< 0 || ret
>= MAXPATHLEN
)
2777 if (!file_exists(path
))
2779 if (!(fout
= fopen(path
, "w"))) {
2780 SYSERROR("unable to open %s: ignoring", path
);
2783 if (fprintf(fout
, "%s", c
->name
) < 0) {
2787 if (fclose(fout
) < 0)
2796 static int clone_update_rootfs_wrapper(void *data
)
2798 struct clone_update_data
*arg
= (struct clone_update_data
*) data
;
2799 return clone_update_rootfs(arg
);
2803 * We want to support:
2804 sudo lxc-clone -o o1 -n n1 -s -L|-fssize fssize -v|--vgname vgname \
2805 -p|--lvprefix lvprefix -t|--fstype fstype -B backingstore
2807 -s [ implies overlayfs]
2811 only rootfs gets converted (copied/snapshotted) on clone.
2814 static int create_file_dirname(char *path
, struct lxc_conf
*conf
)
2816 char *p
= strrchr(path
, '/');
2822 ret
= do_create_container_dir(path
, conf
);
2827 static struct lxc_container
*do_lxcapi_clone(struct lxc_container
*c
, const char *newname
,
2828 const char *lxcpath
, int flags
,
2829 const char *bdevtype
, const char *bdevdata
, uint64_t newsize
,
2832 struct lxc_container
*c2
= NULL
;
2833 char newpath
[MAXPATHLEN
];
2834 int ret
, storage_copied
= 0;
2835 char *origroot
= NULL
;
2836 struct clone_update_data data
;
2840 if (!c
|| !do_lxcapi_is_defined(c
))
2843 if (container_mem_lock(c
))
2846 if (!is_stopped(c
)) {
2847 ERROR("error: Original container (%s) is running", c
->name
);
2851 // Make sure the container doesn't yet exist.
2855 lxcpath
= do_lxcapi_get_config_path(c
);
2856 ret
= snprintf(newpath
, MAXPATHLEN
, "%s/%s/config", lxcpath
, newname
);
2857 if (ret
< 0 || ret
>= MAXPATHLEN
) {
2858 SYSERROR("clone: failed making config pathname");
2861 if (file_exists(newpath
)) {
2862 ERROR("error: clone: %s exists", newpath
);
2866 ret
= create_file_dirname(newpath
, c
->lxc_conf
);
2867 if (ret
< 0 && errno
!= EEXIST
) {
2868 ERROR("Error creating container dir for %s", newpath
);
2872 // copy the configuration, tweak it as needed,
2873 if (c
->lxc_conf
->rootfs
.path
) {
2874 origroot
= c
->lxc_conf
->rootfs
.path
;
2875 c
->lxc_conf
->rootfs
.path
= NULL
;
2877 fout
= fopen(newpath
, "w");
2879 SYSERROR("open %s", newpath
);
2882 write_config(fout
, c
->lxc_conf
);
2884 c
->lxc_conf
->rootfs
.path
= origroot
;
2886 sprintf(newpath
, "%s/%s/rootfs", lxcpath
, newname
);
2887 if (mkdir(newpath
, 0755) < 0) {
2888 SYSERROR("error creating %s", newpath
);
2893 if (chown_mapped_root(newpath
, c
->lxc_conf
) < 0) {
2894 ERROR("Error chowning %s to container root", newpath
);
2899 c2
= lxc_container_new(newname
, lxcpath
);
2901 ERROR("clone: failed to create new container (%s %s)", newname
,
2906 // copy/snapshot rootfs's
2907 ret
= copy_storage(c
, c2
, bdevtype
, flags
, bdevdata
, newsize
);
2911 clear_unexp_config_line(c2
->lxc_conf
, "lxc.utsname", false);
2914 if (!set_config_item_locked(c2
, "lxc.utsname", newname
)) {
2915 ERROR("Error setting new hostname");
2920 ret
= copyhooks(c
, c2
);
2922 ERROR("error copying hooks");
2926 if (copy_fstab(c
, c2
) < 0) {
2927 ERROR("error copying fstab");
2932 if (!(flags
& LXC_CLONE_KEEPMACADDR
)) {
2933 if (!network_new_hwaddrs(c2
->lxc_conf
)) {
2934 ERROR("Error updating mac addresses");
2939 // We've now successfully created c2's storage, so clear it out if we
2943 if (!c2
->save_config(c2
, NULL
))
2946 if ((pid
= fork()) < 0) {
2951 ret
= wait_for_pid(pid
);
2954 container_mem_unlock(c
);
2960 data
.hookargs
= hookargs
;
2962 ret
= userns_exec_1(c
->lxc_conf
, clone_update_rootfs_wrapper
,
2965 ret
= clone_update_rootfs(&data
);
2969 container_mem_unlock(c
);
2973 container_mem_unlock(c
);
2975 if (!storage_copied
)
2976 c2
->lxc_conf
->rootfs
.path
= NULL
;
2978 lxc_container_put(c2
);
2984 static struct lxc_container
*lxcapi_clone(struct lxc_container
*c
, const char *newname
,
2985 const char *lxcpath
, int flags
,
2986 const char *bdevtype
, const char *bdevdata
, uint64_t newsize
,
2989 struct lxc_container
* ret
;
2990 current_config
= c
? c
->lxc_conf
: NULL
;
2991 ret
= do_lxcapi_clone(c
, newname
, lxcpath
, flags
, bdevtype
, bdevdata
, newsize
, hookargs
);
2992 current_config
= NULL
;
2996 static bool do_lxcapi_rename(struct lxc_container
*c
, const char *newname
)
2999 struct lxc_container
*newc
;
3001 if (!c
|| !c
->name
|| !c
->config_path
|| !c
->lxc_conf
)
3004 if (has_fs_snapshots(c
) || has_snapshots(c
)) {
3005 ERROR("Renaming a container with snapshots is not supported");
3008 bdev
= bdev_init(c
->lxc_conf
, c
->lxc_conf
->rootfs
.path
, c
->lxc_conf
->rootfs
.mount
, NULL
);
3010 ERROR("Failed to find original backing store type");
3014 newc
= lxcapi_clone(c
, newname
, c
->config_path
, LXC_CLONE_KEEPMACADDR
, NULL
, bdev
->type
, 0, NULL
);
3017 lxc_container_put(newc
);
3021 if (newc
&& lxcapi_is_defined(newc
))
3022 lxc_container_put(newc
);
3024 if (!container_destroy(c
)) {
3025 ERROR("Could not destroy existing container %s", c
->name
);
3031 WRAP_API_1(bool, lxcapi_rename
, const char *)
3033 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
)
3040 current_config
= c
->lxc_conf
;
3042 ret
= lxc_attach(c
->name
, c
->config_path
, exec_function
, exec_payload
, options
, attached_process
);
3043 current_config
= NULL
;
3047 static int do_lxcapi_attach_run_wait(struct lxc_container
*c
, lxc_attach_options_t
*options
, const char *program
, const char * const argv
[])
3049 lxc_attach_command_t command
;
3056 command
.program
= (char*)program
;
3057 command
.argv
= (char**)argv
;
3058 r
= lxc_attach(c
->name
, c
->config_path
, lxc_attach_run_command
, &command
, options
, &pid
);
3063 return lxc_wait_for_pid_status(pid
);
3066 static int lxcapi_attach_run_wait(struct lxc_container
*c
, lxc_attach_options_t
*options
, const char *program
, const char * const argv
[])
3069 current_config
= c
? c
->lxc_conf
: NULL
;
3070 ret
= do_lxcapi_attach_run_wait(c
, options
, program
, argv
);
3071 current_config
= NULL
;
3075 static int get_next_index(const char *lxcpath
, char *cname
)
3081 fname
= alloca(strlen(lxcpath
) + 20);
3083 sprintf(fname
, "%s/snap%d", lxcpath
, i
);
3084 ret
= stat(fname
, &sb
);
3091 static bool get_snappath_dir(struct lxc_container
*c
, char *snappath
)
3095 * If the old style snapshot path exists, use it
3096 * /var/lib/lxc -> /var/lib/lxcsnaps
3098 ret
= snprintf(snappath
, MAXPATHLEN
, "%ssnaps", c
->config_path
);
3099 if (ret
< 0 || ret
>= MAXPATHLEN
)
3101 if (dir_exists(snappath
)) {
3102 ret
= snprintf(snappath
, MAXPATHLEN
, "%ssnaps/%s", c
->config_path
, c
->name
);
3103 if (ret
< 0 || ret
>= MAXPATHLEN
)
3109 * Use the new style path
3110 * /var/lib/lxc -> /var/lib/lxc + c->name + /snaps + \0
3112 ret
= snprintf(snappath
, MAXPATHLEN
, "%s/%s/snaps", c
->config_path
, c
->name
);
3113 if (ret
< 0 || ret
>= MAXPATHLEN
)
3118 static int do_lxcapi_snapshot(struct lxc_container
*c
, const char *commentfile
)
3121 struct lxc_container
*c2
;
3122 char snappath
[MAXPATHLEN
], newname
[20];
3124 if (!c
|| !lxcapi_is_defined(c
))
3127 if (!bdev_can_backup(c
->lxc_conf
)) {
3128 ERROR("%s's backing store cannot be backed up.", c
->name
);
3129 ERROR("Your container must use another backing store type.");
3133 if (!get_snappath_dir(c
, snappath
))
3136 i
= get_next_index(snappath
, c
->name
);
3138 if (mkdir_p(snappath
, 0755) < 0) {
3139 ERROR("Failed to create snapshot directory %s", snappath
);
3143 ret
= snprintf(newname
, 20, "snap%d", i
);
3144 if (ret
< 0 || ret
>= 20)
3148 * We pass LXC_CLONE_SNAPSHOT to make sure that a rdepends file entry is
3149 * created in the original container
3151 flags
= LXC_CLONE_SNAPSHOT
| LXC_CLONE_KEEPMACADDR
| LXC_CLONE_KEEPNAME
|
3152 LXC_CLONE_KEEPBDEVTYPE
| LXC_CLONE_MAYBE_SNAPSHOT
;
3153 if (bdev_is_dir(c
->lxc_conf
, c
->lxc_conf
->rootfs
.path
)) {
3154 ERROR("Snapshot of directory-backed container requested.");
3155 ERROR("Making a copy-clone. If you do want snapshots, then");
3156 ERROR("please create an aufs or overlayfs clone first, snapshot that");
3157 ERROR("and keep the original container pristine.");
3158 flags
&= ~LXC_CLONE_SNAPSHOT
| LXC_CLONE_MAYBE_SNAPSHOT
;
3160 c2
= do_lxcapi_clone(c
, newname
, snappath
, flags
, NULL
, NULL
, 0, NULL
);
3162 ERROR("clone of %s:%s failed", c
->config_path
, c
->name
);
3166 lxc_container_put(c2
);
3168 // Now write down the creation time
3175 tm_info
= localtime(&timer
);
3177 strftime(buffer
, 25, "%Y:%m:%d %H:%M:%S", tm_info
);
3179 char *dfnam
= alloca(strlen(snappath
) + strlen(newname
) + 5);
3180 sprintf(dfnam
, "%s/%s/ts", snappath
, newname
);
3181 f
= fopen(dfnam
, "w");
3183 ERROR("Failed to open %s", dfnam
);
3186 if (fprintf(f
, "%s", buffer
) < 0) {
3187 SYSERROR("Writing timestamp");
3193 SYSERROR("Writing timestamp");
3198 // $p / $name / comment \0
3199 int len
= strlen(snappath
) + strlen(newname
) + 10;
3200 char *path
= alloca(len
);
3201 sprintf(path
, "%s/%s/comment", snappath
, newname
);
3202 return copy_file(commentfile
, path
) < 0 ? -1 : i
;
3208 WRAP_API_1(int, lxcapi_snapshot
, const char *)
3210 static void lxcsnap_free(struct lxc_snapshot
*s
)
3213 free(s
->comment_pathname
);
3218 static char *get_snapcomment_path(char* snappath
, char *name
)
3220 // $snappath/$name/comment
3221 int ret
, len
= strlen(snappath
) + strlen(name
) + 10;
3222 char *s
= malloc(len
);
3225 ret
= snprintf(s
, len
, "%s/%s/comment", snappath
, name
);
3226 if (ret
< 0 || ret
>= len
) {
3234 static char *get_timestamp(char* snappath
, char *name
)
3236 char path
[MAXPATHLEN
], *s
= NULL
;
3240 ret
= snprintf(path
, MAXPATHLEN
, "%s/%s/ts", snappath
, name
);
3241 if (ret
< 0 || ret
>= MAXPATHLEN
)
3243 fin
= fopen(path
, "r");
3246 (void) fseek(fin
, 0, SEEK_END
);
3248 (void) fseek(fin
, 0, SEEK_SET
);
3253 if (fread(s
, 1, len
, fin
) != len
) {
3254 SYSERROR("reading timestamp");
3264 static int do_lxcapi_snapshot_list(struct lxc_container
*c
, struct lxc_snapshot
**ret_snaps
)
3266 char snappath
[MAXPATHLEN
], path2
[MAXPATHLEN
];
3268 struct dirent dirent
, *direntp
;
3269 struct lxc_snapshot
*snaps
=NULL
, *nsnaps
;
3272 if (!c
|| !lxcapi_is_defined(c
))
3275 if (!get_snappath_dir(c
, snappath
)) {
3276 ERROR("path name too long");
3279 dir
= opendir(snappath
);
3281 INFO("failed to open %s - assuming no snapshots", snappath
);
3285 while (!readdir_r(dir
, &dirent
, &direntp
)) {
3289 if (!strcmp(direntp
->d_name
, "."))
3292 if (!strcmp(direntp
->d_name
, ".."))
3295 ret
= snprintf(path2
, MAXPATHLEN
, "%s/%s/config", snappath
, direntp
->d_name
);
3296 if (ret
< 0 || ret
>= MAXPATHLEN
) {
3297 ERROR("pathname too long");
3300 if (!file_exists(path2
))
3302 nsnaps
= realloc(snaps
, (count
+ 1)*sizeof(*snaps
));
3304 SYSERROR("Out of memory");
3308 snaps
[count
].free
= lxcsnap_free
;
3309 snaps
[count
].name
= strdup(direntp
->d_name
);
3310 if (!snaps
[count
].name
)
3312 snaps
[count
].lxcpath
= strdup(snappath
);
3313 if (!snaps
[count
].lxcpath
) {
3314 free(snaps
[count
].name
);
3317 snaps
[count
].comment_pathname
= get_snapcomment_path(snappath
, direntp
->d_name
);
3318 snaps
[count
].timestamp
= get_timestamp(snappath
, direntp
->d_name
);
3323 WARN("failed to close directory");
3331 for (i
=0; i
<count
; i
++)
3332 lxcsnap_free(&snaps
[i
]);
3336 WARN("failed to close directory");
3340 WRAP_API_1(int, lxcapi_snapshot_list
, struct lxc_snapshot
**)
3342 static bool do_lxcapi_snapshot_restore(struct lxc_container
*c
, const char *snapname
, const char *newname
)
3344 char clonelxcpath
[MAXPATHLEN
];
3346 struct lxc_container
*snap
, *rest
;
3350 if (!c
|| !c
->name
|| !c
->config_path
)
3353 if (has_fs_snapshots(c
)) {
3354 ERROR("container rootfs has dependent snapshots");
3358 bdev
= bdev_init(c
->lxc_conf
, c
->lxc_conf
->rootfs
.path
, c
->lxc_conf
->rootfs
.mount
, NULL
);
3360 ERROR("Failed to find original backing store type");
3367 if (!get_snappath_dir(c
, clonelxcpath
)) {
3371 // how should we lock this?
3373 snap
= lxc_container_new(snapname
, clonelxcpath
);
3374 if (!snap
|| !lxcapi_is_defined(snap
)) {
3375 ERROR("Could not open snapshot %s", snapname
);
3376 if (snap
) lxc_container_put(snap
);
3381 if (strcmp(c
->name
, newname
) == 0) {
3382 if (!container_destroy(c
)) {
3383 ERROR("Could not destroy existing container %s", newname
);
3384 lxc_container_put(snap
);
3390 if (strcmp(bdev
->type
, "dir") != 0 && strcmp(bdev
->type
, "loop") != 0)
3391 flags
= LXC_CLONE_SNAPSHOT
| LXC_CLONE_MAYBE_SNAPSHOT
;
3392 rest
= lxcapi_clone(snap
, newname
, c
->config_path
, flags
,
3393 bdev
->type
, NULL
, 0, NULL
);
3395 if (rest
&& lxcapi_is_defined(rest
))
3398 lxc_container_put(rest
);
3399 lxc_container_put(snap
);
3403 WRAP_API_2(bool, lxcapi_snapshot_restore
, const char *, const char *)
3405 static bool do_snapshot_destroy(const char *snapname
, const char *clonelxcpath
)
3407 struct lxc_container
*snap
= NULL
;
3410 snap
= lxc_container_new(snapname
, clonelxcpath
);
3412 ERROR("Could not find snapshot %s", snapname
);
3416 if (!do_lxcapi_destroy(snap
)) {
3417 ERROR("Could not destroy snapshot %s", snapname
);
3424 lxc_container_put(snap
);
3428 static bool remove_all_snapshots(const char *path
)
3431 struct dirent dirent
, *direntp
;
3434 dir
= opendir(path
);
3436 SYSERROR("opendir on snapshot path %s", path
);
3439 while (!readdir_r(dir
, &dirent
, &direntp
)) {
3442 if (!strcmp(direntp
->d_name
, "."))
3444 if (!strcmp(direntp
->d_name
, ".."))
3446 if (!do_snapshot_destroy(direntp
->d_name
, path
)) {
3455 SYSERROR("Error removing directory %s", path
);
3460 static bool do_lxcapi_snapshot_destroy(struct lxc_container
*c
, const char *snapname
)
3462 char clonelxcpath
[MAXPATHLEN
];
3464 if (!c
|| !c
->name
|| !c
->config_path
|| !snapname
)
3467 if (!get_snappath_dir(c
, clonelxcpath
))
3470 return do_snapshot_destroy(snapname
, clonelxcpath
);
3473 WRAP_API_1(bool, lxcapi_snapshot_destroy
, const char *)
3475 static bool do_lxcapi_snapshot_destroy_all(struct lxc_container
*c
)
3477 char clonelxcpath
[MAXPATHLEN
];
3479 if (!c
|| !c
->name
|| !c
->config_path
)
3482 if (!get_snappath_dir(c
, clonelxcpath
))
3485 return remove_all_snapshots(clonelxcpath
);
3488 WRAP_API(bool, lxcapi_snapshot_destroy_all
)
3490 static bool do_lxcapi_may_control(struct lxc_container
*c
)
3492 return lxc_try_cmd(c
->name
, c
->config_path
) == 0;
3495 WRAP_API(bool, lxcapi_may_control
)
3497 static bool do_add_remove_node(pid_t init_pid
, const char *path
, bool add
,
3500 char chrootpath
[MAXPATHLEN
];
3501 char *directory_path
= NULL
;
3505 if ((pid
= fork()) < 0) {
3506 SYSERROR("failed to fork a child helper");
3510 if (wait_for_pid(pid
) != 0) {
3511 ERROR("Failed to create note in guest");
3517 /* prepare the path */
3518 ret
= snprintf(chrootpath
, MAXPATHLEN
, "/proc/%d/root", init_pid
);
3519 if (ret
< 0 || ret
>= MAXPATHLEN
)
3522 if (chroot(chrootpath
) < 0)
3526 /* remove path if it exists */
3527 if(faccessat(AT_FDCWD
, path
, F_OK
, AT_SYMLINK_NOFOLLOW
) == 0) {
3528 if (unlink(path
) < 0) {
3529 ERROR("unlink failed");
3536 /* create any missing directories */
3537 directory_path
= dirname(strdup(path
));
3538 if (mkdir_p(directory_path
, 0755) < 0 && errno
!= EEXIST
) {
3539 ERROR("failed to create directory");
3543 /* create the device node */
3544 if (mknod(path
, st
->st_mode
, st
->st_rdev
) < 0) {
3545 ERROR("mknod failed");
3552 static bool add_remove_device_node(struct lxc_container
*c
, const char *src_path
, const char *dest_path
, bool add
)
3556 char value
[MAX_BUFFER
];
3559 /* make sure container is running */
3560 if (!do_lxcapi_is_running(c
)) {
3561 ERROR("container is not running");
3565 /* use src_path if dest_path is NULL otherwise use dest_path */
3566 p
= dest_path
? dest_path
: src_path
;
3568 /* make sure we can access p */
3569 if(access(p
, F_OK
) < 0 || stat(p
, &st
) < 0)
3572 /* continue if path is character device or block device */
3573 if (S_ISCHR(st
.st_mode
))
3574 ret
= snprintf(value
, MAX_BUFFER
, "c %d:%d rwm", major(st
.st_rdev
), minor(st
.st_rdev
));
3575 else if (S_ISBLK(st
.st_mode
))
3576 ret
= snprintf(value
, MAX_BUFFER
, "b %d:%d rwm", major(st
.st_rdev
), minor(st
.st_rdev
));
3580 /* check snprintf return code */
3581 if (ret
< 0 || ret
>= MAX_BUFFER
)
3584 if (!do_add_remove_node(do_lxcapi_init_pid(c
), p
, add
, &st
))
3587 /* add or remove device to/from cgroup access list */
3589 if (!do_lxcapi_set_cgroup_item(c
, "devices.allow", value
)) {
3590 ERROR("set_cgroup_item failed while adding the device node");
3594 if (!do_lxcapi_set_cgroup_item(c
, "devices.deny", value
)) {
3595 ERROR("set_cgroup_item failed while removing the device node");
3603 static bool do_lxcapi_add_device_node(struct lxc_container
*c
, const char *src_path
, const char *dest_path
)
3606 ERROR(NOT_SUPPORTED_ERROR
, __FUNCTION__
);
3609 return add_remove_device_node(c
, src_path
, dest_path
, true);
3612 WRAP_API_2(bool, lxcapi_add_device_node
, const char *, const char *)
3614 static bool do_lxcapi_remove_device_node(struct lxc_container
*c
, const char *src_path
, const char *dest_path
)
3617 ERROR(NOT_SUPPORTED_ERROR
, __FUNCTION__
);
3620 return add_remove_device_node(c
, src_path
, dest_path
, false);
3623 WRAP_API_2(bool, lxcapi_remove_device_node
, const char *, const char *)
3625 static bool do_lxcapi_attach_interface(struct lxc_container
*c
, const char *ifname
,
3626 const char *dst_ifname
)
3630 ERROR(NOT_SUPPORTED_ERROR
, __FUNCTION__
);
3635 ERROR("No source interface name given");
3639 ret
= lxc_netdev_isup(ifname
);
3642 /* netdev of ifname is up. */
3643 ret
= lxc_netdev_down(ifname
);
3648 ret
= lxc_netdev_move_by_name(ifname
, do_lxcapi_init_pid(c
), dst_ifname
);
3658 WRAP_API_2(bool, lxcapi_attach_interface
, const char *, const char *)
3660 static bool do_lxcapi_detach_interface(struct lxc_container
*c
, const char *ifname
,
3661 const char *dst_ifname
)
3663 pid_t pid
, pid_outside
;
3666 ERROR(NOT_SUPPORTED_ERROR
, __FUNCTION__
);
3671 ERROR("No source interface name given");
3675 pid_outside
= getpid();
3678 ERROR("failed to fork task to get interfaces information");
3682 if (pid
== 0) { // child
3684 if (!enter_net_ns(c
)) {
3685 ERROR("failed to enter namespace");
3689 ret
= lxc_netdev_isup(ifname
);
3693 /* netdev of ifname is up. */
3695 ret
= lxc_netdev_down(ifname
);
3700 ret
= lxc_netdev_move_by_name(ifname
, pid_outside
, dst_ifname
);
3702 /* -EINVAL means there is no netdev named as ifanme. */
3703 if (ret
== -EINVAL
) {
3704 ERROR("No network device named as %s.", ifname
);
3709 if (wait_for_pid(pid
) != 0)
3715 WRAP_API_2(bool, lxcapi_detach_interface
, const char *, const char *)
3717 static bool do_lxcapi_checkpoint(struct lxc_container
*c
, char *directory
, bool stop
, bool verbose
)
3721 char path
[PATH_MAX
];
3726 if (mkdir(directory
, 0700) < 0 && errno
!= EEXIST
)
3729 status
= snprintf(path
, sizeof(path
), "%s/inventory.img", directory
);
3730 if (status
< 0 || status
>= sizeof(path
))
3733 if (access(path
, F_OK
) == 0) {
3734 ERROR("please use a fresh directory for the dump directory\n");
3738 if (!dump_net_info(c
, directory
))
3746 struct criu_opts os
;
3749 os
.directory
= directory
;
3752 os
.verbose
= verbose
;
3754 /* exec_criu() returning is an error */
3758 pid_t w
= waitpid(pid
, &status
, 0);
3760 SYSERROR("waitpid");
3764 if (WIFEXITED(status
)) {
3765 return !WEXITSTATUS(status
);
3772 WRAP_API_3(bool, lxcapi_checkpoint
, char *, bool, bool)
3774 static bool do_lxcapi_restore(struct lxc_container
*c
, char *directory
, bool verbose
)
3784 ERROR("Must be root to restore\n");
3789 ERROR("failed to create pipe");
3802 // this never returns
3803 do_restore(c
, pipefd
[1], directory
, verbose
);
3808 nread
= read(pipefd
[0], &status
, sizeof(status
));
3810 if (sizeof(status
) != nread
) {
3811 ERROR("reading status from pipe failed");
3815 // If the criu process was killed or exited nonzero, wait() for the
3816 // handler, since the restore process died. Otherwise, we don't need to
3817 // wait, since the child becomes the monitor process.
3818 if (!WIFEXITED(status
) || WEXITSTATUS(status
))
3823 if (wait_for_pid(pid
))
3824 ERROR("restore process died");
3828 WRAP_API_2(bool, lxcapi_restore
, char *, bool)
3830 static int lxcapi_attach_run_waitl(struct lxc_container
*c
, lxc_attach_options_t
*options
, const char *program
, const char *arg
, ...)
3839 current_config
= c
->lxc_conf
;
3842 argv
= lxc_va_arg_list_to_argv_const(ap
, 1);
3846 ERROR("Memory allocation error.");
3852 ret
= do_lxcapi_attach_run_wait(c
, options
, program
, (const char * const *)argv
);
3855 current_config
= NULL
;
3859 struct lxc_container
*lxc_container_new(const char *name
, const char *configpath
)
3861 struct lxc_container
*c
;
3866 c
= malloc(sizeof(*c
));
3868 fprintf(stderr
, "failed to malloc lxc_container\n");
3871 memset(c
, 0, sizeof(*c
));
3874 c
->config_path
= strdup(configpath
);
3876 c
->config_path
= strdup(lxc_global_config_value("lxc.lxcpath"));
3878 if (!c
->config_path
) {
3879 fprintf(stderr
, "Out of memory\n");
3883 remove_trailing_slashes(c
->config_path
);
3884 c
->name
= malloc(strlen(name
)+1);
3886 fprintf(stderr
, "Error allocating lxc_container name\n");
3889 strcpy(c
->name
, name
);
3892 if (!(c
->slock
= lxc_newlock(c
->config_path
, name
))) {
3893 fprintf(stderr
, "failed to create lock\n");
3897 if (!(c
->privlock
= lxc_newlock(NULL
, NULL
))) {
3898 fprintf(stderr
, "failed to alloc privlock\n");
3902 if (!set_config_filename(c
)) {
3903 fprintf(stderr
, "Error allocating config file pathname\n");
3907 if (file_exists(c
->configfile
) && !lxcapi_load_config(c
, NULL
))
3910 if (ongoing_create(c
) == 2) {
3911 ERROR("Error: %s creation was not completed", c
->name
);
3912 container_destroy(c
);
3913 lxcapi_clear_config(c
);
3915 c
->daemonize
= true;
3918 // assign the member functions
3919 c
->is_defined
= lxcapi_is_defined
;
3920 c
->state
= lxcapi_state
;
3921 c
->is_running
= lxcapi_is_running
;
3922 c
->freeze
= lxcapi_freeze
;
3923 c
->unfreeze
= lxcapi_unfreeze
;
3924 c
->console
= lxcapi_console
;
3925 c
->console_getfd
= lxcapi_console_getfd
;
3926 c
->init_pid
= lxcapi_init_pid
;
3927 c
->load_config
= lxcapi_load_config
;
3928 c
->want_daemonize
= lxcapi_want_daemonize
;
3929 c
->want_close_all_fds
= lxcapi_want_close_all_fds
;
3930 c
->start
= lxcapi_start
;
3931 c
->startl
= lxcapi_startl
;
3932 c
->stop
= lxcapi_stop
;
3933 c
->config_file_name
= lxcapi_config_file_name
;
3934 c
->wait
= lxcapi_wait
;
3935 c
->set_config_item
= lxcapi_set_config_item
;
3936 c
->destroy
= lxcapi_destroy
;
3937 c
->destroy_with_snapshots
= lxcapi_destroy_with_snapshots
;
3938 c
->rename
= lxcapi_rename
;
3939 c
->save_config
= lxcapi_save_config
;
3940 c
->get_keys
= lxcapi_get_keys
;
3941 c
->create
= lxcapi_create
;
3942 c
->createl
= lxcapi_createl
;
3943 c
->shutdown
= lxcapi_shutdown
;
3944 c
->reboot
= lxcapi_reboot
;
3945 c
->clear_config
= lxcapi_clear_config
;
3946 c
->clear_config_item
= lxcapi_clear_config_item
;
3947 c
->get_config_item
= lxcapi_get_config_item
;
3948 c
->get_running_config_item
= lxcapi_get_running_config_item
;
3949 c
->get_cgroup_item
= lxcapi_get_cgroup_item
;
3950 c
->set_cgroup_item
= lxcapi_set_cgroup_item
;
3951 c
->get_config_path
= lxcapi_get_config_path
;
3952 c
->set_config_path
= lxcapi_set_config_path
;
3953 c
->clone
= lxcapi_clone
;
3954 c
->get_interfaces
= lxcapi_get_interfaces
;
3955 c
->get_ips
= lxcapi_get_ips
;
3956 c
->attach
= lxcapi_attach
;
3957 c
->attach_run_wait
= lxcapi_attach_run_wait
;
3958 c
->attach_run_waitl
= lxcapi_attach_run_waitl
;
3959 c
->snapshot
= lxcapi_snapshot
;
3960 c
->snapshot_list
= lxcapi_snapshot_list
;
3961 c
->snapshot_restore
= lxcapi_snapshot_restore
;
3962 c
->snapshot_destroy
= lxcapi_snapshot_destroy
;
3963 c
->snapshot_destroy_all
= lxcapi_snapshot_destroy_all
;
3964 c
->may_control
= lxcapi_may_control
;
3965 c
->add_device_node
= lxcapi_add_device_node
;
3966 c
->remove_device_node
= lxcapi_remove_device_node
;
3967 c
->attach_interface
= lxcapi_attach_interface
;
3968 c
->detach_interface
= lxcapi_detach_interface
;
3969 c
->checkpoint
= lxcapi_checkpoint
;
3970 c
->restore
= lxcapi_restore
;
3975 lxc_container_free(c
);
3979 int lxc_get_wait_states(const char **states
)
3984 for (i
=0; i
<MAX_STATE
; i
++)
3985 states
[i
] = lxc_state2str(i
);
3990 * These next two could probably be done smarter with reusing a common function
3991 * with different iterators and tests...
3993 int list_defined_containers(const char *lxcpath
, char ***names
, struct lxc_container
***cret
)
3996 int i
, cfound
= 0, nfound
= 0;
3997 struct dirent dirent
, *direntp
;
3998 struct lxc_container
*c
;
4001 lxcpath
= lxc_global_config_value("lxc.lxcpath");
4003 dir
= opendir(lxcpath
);
4005 SYSERROR("opendir on lxcpath");
4014 while (!readdir_r(dir
, &dirent
, &direntp
)) {
4017 if (!strcmp(direntp
->d_name
, "."))
4019 if (!strcmp(direntp
->d_name
, ".."))
4022 if (!config_file_exists(lxcpath
, direntp
->d_name
))
4026 if (!add_to_array(names
, direntp
->d_name
, cfound
))
4036 c
= lxc_container_new(direntp
->d_name
, lxcpath
);
4038 INFO("Container %s:%s has a config but could not be loaded",
4039 lxcpath
, direntp
->d_name
);
4041 if(!remove_from_array(names
, direntp
->d_name
, cfound
--))
4045 if (!do_lxcapi_is_defined(c
)) {
4046 INFO("Container %s:%s has a config but is not defined",
4047 lxcpath
, direntp
->d_name
);
4049 if(!remove_from_array(names
, direntp
->d_name
, cfound
--))
4051 lxc_container_put(c
);
4055 if (!add_to_clist(cret
, c
, nfound
, true)) {
4056 lxc_container_put(c
);
4066 if (names
&& *names
) {
4067 for (i
=0; i
<cfound
; i
++)
4071 if (cret
&& *cret
) {
4072 for (i
=0; i
<nfound
; i
++)
4073 lxc_container_put((*cret
)[i
]);
4080 int list_active_containers(const char *lxcpath
, char ***nret
,
4081 struct lxc_container
***cret
)
4083 int i
, ret
= -1, cret_cnt
= 0, ct_name_cnt
= 0;
4086 char **ct_name
= NULL
;
4088 struct lxc_container
*c
;
4092 lxcpath
= lxc_global_config_value("lxc.lxcpath");
4093 lxcpath_len
= strlen(lxcpath
);
4100 FILE *f
= fopen("/proc/net/unix", "r");
4104 while (getline(&line
, &len
, f
) != -1) {
4106 char *p
= strrchr(line
, ' '), *p2
;
4115 if (strncmp(p
, lxcpath
, lxcpath_len
) == 0) {
4117 } else if (strncmp(p
, "lxc/", 4) == 0) {
4127 // Now p is the start of lxc_name
4128 p2
= strchr(p
, '/');
4129 if (!p2
|| strncmp(p2
, "/command", 8) != 0)
4134 if (strncmp(lxcpath
, lxc_cmd_get_lxcpath(p
), lxcpath_len
) != 0)
4136 p
= lxc_cmd_get_name(p
);
4139 if (array_contains(&ct_name
, p
, ct_name_cnt
))
4142 if (!add_to_array(&ct_name
, p
, ct_name_cnt
))
4143 goto free_cret_list
;
4150 c
= lxc_container_new(p
, lxcpath
);
4152 INFO("Container %s:%s is running but could not be loaded",
4154 remove_from_array(&ct_name
, p
, ct_name_cnt
--);
4159 * If this is an anonymous container, then is_defined *can*
4160 * return false. So we don't do that check. Count on the
4161 * fact that the command socket exists.
4164 if (!add_to_clist(cret
, c
, cret_cnt
, true)) {
4165 lxc_container_put(c
);
4166 goto free_cret_list
;
4171 assert(!nret
|| !cret
|| cret_cnt
== ct_name_cnt
);
4180 if (cret
&& *cret
) {
4181 for (i
= 0; i
< cret_cnt
; i
++)
4182 lxc_container_put((*cret
)[i
]);
4188 for (i
= 0; i
< ct_name_cnt
; i
++)
4200 int list_all_containers(const char *lxcpath
, char ***nret
,
4201 struct lxc_container
***cret
)
4203 int i
, ret
, active_cnt
, ct_cnt
, ct_list_cnt
;
4206 struct lxc_container
**ct_list
= NULL
;
4208 ct_cnt
= list_defined_containers(lxcpath
, &ct_name
, NULL
);
4212 active_cnt
= list_active_containers(lxcpath
, &active_name
, NULL
);
4213 if (active_cnt
< 0) {
4218 for (i
= 0; i
< active_cnt
; i
++) {
4219 if (!array_contains(&ct_name
, active_name
[i
], ct_cnt
)) {
4220 if (!add_to_array(&ct_name
, active_name
[i
], ct_cnt
)) {
4222 goto free_active_name
;
4226 free(active_name
[i
]);
4227 active_name
[i
] = NULL
;
4233 for (i
= 0, ct_list_cnt
= 0; i
< ct_cnt
&& cret
; i
++) {
4234 struct lxc_container
*c
;
4236 c
= lxc_container_new(ct_name
[i
], lxcpath
);
4238 WARN("Container %s:%s could not be loaded", lxcpath
, ct_name
[i
]);
4239 remove_from_array(&ct_name
, ct_name
[i
], ct_cnt
--);
4243 if (!add_to_clist(&ct_list
, c
, ct_list_cnt
, false)) {
4244 lxc_container_put(c
);
4263 for (i
= 0; i
< ct_list_cnt
; i
++) {
4264 lxc_container_put(ct_list
[i
]);
4269 for (i
= 0; i
< active_cnt
; i
++) {
4270 free(active_name
[i
]);
4275 for (i
= 0; i
< ct_cnt
; i
++) {