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);
725 if (null_stdfds() < 0) {
726 ERROR("failed to close fds");
731 if (!am_single_threaded()) {
732 ERROR("Cannot start non-daemonized container when threaded");
737 /* We need to write PID file after daeminize, so we always
738 * write the right PID.
741 pid_fp
= fopen(c
->pidfile
, "w");
742 if (pid_fp
== NULL
) {
743 SYSERROR("Failed to create pidfile '%s' for '%s'",
744 c
->pidfile
, c
->name
);
750 if (fprintf(pid_fp
, "%d\n", getpid()) < 0) {
751 SYSERROR("Failed to write '%s'", c
->pidfile
);
766 if (lxc_check_inherited(conf
, daemonize
, -1)) {
767 ERROR("Inherited fds found");
772 ret
= lxc_start(c
->name
, argv
, conf
, c
->config_path
, daemonize
);
776 INFO("container requested reboot");
789 exit (ret
== 0 ? true : false);
791 return (ret
== 0 ? true : false);
794 static bool lxcapi_start(struct lxc_container
*c
, int useinit
, char * const argv
[])
797 current_config
= c
? c
->lxc_conf
: NULL
;
798 ret
= do_lxcapi_start(c
, useinit
, argv
);
799 current_config
= NULL
;
804 * note there MUST be an ending NULL
806 static bool lxcapi_startl(struct lxc_container
*c
, int useinit
, ...)
809 char **inargs
= NULL
;
812 /* container exists */
816 current_config
= c
->lxc_conf
;
818 va_start(ap
, useinit
);
819 inargs
= lxc_va_arg_list_to_argv(ap
, 0, 1);
823 ERROR("Memory allocation error.");
827 /* pass NULL if no arguments were supplied */
828 bret
= do_lxcapi_start(c
, useinit
, *inargs
? inargs
: NULL
);
833 for (arg
= inargs
; *arg
; arg
++)
838 current_config
= NULL
;
842 static bool do_lxcapi_stop(struct lxc_container
*c
)
849 ret
= lxc_cmd_stop(c
->name
, c
->config_path
);
854 WRAP_API(bool, lxcapi_stop
)
856 static int do_create_container_dir(const char *path
, struct lxc_conf
*conf
)
858 int ret
= -1, lasterr
;
859 char *p
= alloca(strlen(path
)+1);
860 mode_t mask
= umask(0002);
861 ret
= mkdir(path
, 0770);
869 SYSERROR("failed to create container path %s", path
);
874 if (!lxc_list_empty(&conf
->id_map
) && chown_mapped_root(p
, conf
) != 0) {
875 ERROR("Failed to chown container dir");
882 * create the standard expected container dir
884 static bool create_container_dir(struct lxc_container
*c
)
889 len
= strlen(c
->config_path
) + strlen(c
->name
) + 2;
893 ret
= snprintf(s
, len
, "%s/%s", c
->config_path
, c
->name
);
894 if (ret
< 0 || ret
>= len
) {
898 ret
= do_create_container_dir(s
, c
->lxc_conf
);
904 * do_bdev_create: thin wrapper around bdev_create(). Like bdev_create(),
905 * it returns a mounted bdev on success, NULL on error.
907 static struct bdev
*do_bdev_create(struct lxc_container
*c
, const char *type
,
908 struct bdev_specs
*specs
)
915 /* rootfs.path or lxcpath/lxcname/rootfs */
916 if (c
->lxc_conf
->rootfs
.path
&& access(c
->lxc_conf
->rootfs
.path
, F_OK
) == 0) {
917 const char *rpath
= c
->lxc_conf
->rootfs
.path
;
918 len
= strlen(rpath
) + 1;
920 ret
= snprintf(dest
, len
, "%s", rpath
);
922 const char *lxcpath
= do_lxcapi_get_config_path(c
);
923 len
= strlen(c
->name
) + strlen(lxcpath
) + 9;
925 ret
= snprintf(dest
, len
, "%s/%s/rootfs", lxcpath
, c
->name
);
927 if (ret
< 0 || ret
>= len
)
930 bdev
= bdev_create(dest
, type
, c
->name
, specs
);
932 ERROR("Failed to create backing store type %s", type
);
936 do_lxcapi_set_config_item(c
, "lxc.rootfs", bdev
->src
);
938 /* if we are not root, chown the rootfs dir to root in the
941 if (geteuid() != 0 || (c
->lxc_conf
&& !lxc_list_empty(&c
->lxc_conf
->id_map
))) {
942 if (chown_mapped_root(bdev
->dest
, c
->lxc_conf
) < 0) {
943 ERROR("Error chowning %s to container root", bdev
->dest
);
944 suggest_default_idmap();
953 static char *lxcbasename(char *path
)
955 char *p
= path
+ strlen(path
) - 1;
956 while (*p
!= '/' && p
> path
)
961 static bool create_run_template(struct lxc_container
*c
, char *tpath
, bool need_null_stdfds
,
971 SYSERROR("failed to fork task for container creation template");
975 if (pid
== 0) { // child
976 char *patharg
, *namearg
, *rootfsarg
, *src
;
977 struct bdev
*bdev
= NULL
;
979 int ret
, len
, nargs
= 0;
981 struct lxc_conf
*conf
= c
->lxc_conf
;
983 if (need_null_stdfds
&& null_stdfds() < 0) {
987 src
= c
->lxc_conf
->rootfs
.path
;
989 * for an overlay create, what the user wants is the template to fill
990 * in what will become the readonly lower layer. So don't mount for
993 if (strncmp(src
, "overlayfs:", 10) == 0)
994 src
= overlay_getlower(src
+10);
995 if (strncmp(src
, "aufs:", 5) == 0)
996 src
= overlay_getlower(src
+5);
998 bdev
= bdev_init(c
->lxc_conf
, src
, c
->lxc_conf
->rootfs
.mount
, NULL
);
1000 ERROR("Error opening rootfs");
1004 if (geteuid() == 0) {
1005 if (unshare(CLONE_NEWNS
) < 0) {
1006 ERROR("error unsharing mounts");
1009 if (detect_shared_rootfs()) {
1010 if (mount(NULL
, "/", NULL
, MS_SLAVE
|MS_REC
, NULL
)) {
1011 SYSERROR("Failed to make / rslave to run template");
1012 ERROR("Continuing...");
1016 if (strcmp(bdev
->type
, "dir") && strcmp(bdev
->type
, "btrfs")) {
1017 if (geteuid() != 0) {
1018 ERROR("non-root users can only create btrfs and directory-backed containers");
1021 if (bdev
->ops
->mount(bdev
) < 0) {
1022 ERROR("Error mounting rootfs");
1025 } else { // TODO come up with a better way here!
1027 bdev
->dest
= strdup(bdev
->src
);
1031 * create our new array, pre-pend the template name and
1035 for (nargs
= 0; argv
[nargs
]; nargs
++) ;
1036 nargs
+= 4; // template, path, rootfs and name args
1038 newargv
= malloc(nargs
* sizeof(*newargv
));
1041 newargv
[0] = lxcbasename(tpath
);
1043 len
= strlen(c
->config_path
) + strlen(c
->name
) + strlen("--path=") + 2;
1044 patharg
= malloc(len
);
1047 ret
= snprintf(patharg
, len
, "--path=%s/%s", c
->config_path
, c
->name
);
1048 if (ret
< 0 || ret
>= len
)
1050 newargv
[1] = patharg
;
1051 len
= strlen("--name=") + strlen(c
->name
) + 1;
1052 namearg
= malloc(len
);
1055 ret
= snprintf(namearg
, len
, "--name=%s", c
->name
);
1056 if (ret
< 0 || ret
>= len
)
1058 newargv
[2] = namearg
;
1060 len
= strlen("--rootfs=") + 1 + strlen(bdev
->dest
);
1061 rootfsarg
= malloc(len
);
1064 ret
= snprintf(rootfsarg
, len
, "--rootfs=%s", bdev
->dest
);
1065 if (ret
< 0 || ret
>= len
)
1067 newargv
[3] = rootfsarg
;
1069 /* add passed-in args */
1071 for (i
= 4; i
< nargs
; i
++)
1072 newargv
[i
] = argv
[i
-4];
1074 /* add trailing NULL */
1076 newargv
= realloc(newargv
, nargs
* sizeof(*newargv
));
1079 newargv
[nargs
- 1] = NULL
;
1082 * If we're running the template in a mapped userns, then
1083 * we prepend the template command with:
1084 * lxc-usernsexec <-m map1> ... <-m mapn> --
1085 * and we append "--mapped-uid x", where x is the mapped uid
1088 if (!lxc_list_empty(&conf
->id_map
)) {
1092 char **n2
= malloc(n2args
* sizeof(*n2
));
1093 struct lxc_list
*it
;
1097 SYSERROR("out of memory");
1101 tpath
= "lxc-usernsexec";
1102 n2
[0] = "lxc-usernsexec";
1103 lxc_list_for_each(it
, &conf
->id_map
) {
1106 n2
= realloc(n2
, n2args
* sizeof(char *));
1109 n2
[n2args
-2] = "-m";
1110 n2
[n2args
-1] = malloc(200);
1113 ret
= snprintf(n2
[n2args
-1], 200, "%c:%lu:%lu:%lu",
1114 map
->idtype
== ID_TYPE_UID
? 'u' : 'g',
1115 map
->nsid
, map
->hostid
, map
->range
);
1116 if (ret
< 0 || ret
>= 200)
1119 int hostid_mapped
= mapped_hostid(geteuid(), conf
, ID_TYPE_UID
);
1120 int extraargs
= hostid_mapped
>= 0 ? 1 : 3;
1121 n2
= realloc(n2
, (nargs
+ n2args
+ extraargs
) * sizeof(char *));
1124 if (hostid_mapped
< 0) {
1125 hostid_mapped
= find_unmapped_nsuid(conf
, ID_TYPE_UID
);
1126 n2
[n2args
++] = "-m";
1127 if (hostid_mapped
< 0) {
1128 ERROR("Could not find free uid to map");
1131 n2
[n2args
++] = malloc(200);
1132 if (!n2
[n2args
-1]) {
1133 SYSERROR("out of memory");
1136 ret
= snprintf(n2
[n2args
-1], 200, "u:%d:%d:1",
1137 hostid_mapped
, geteuid());
1138 if (ret
< 0 || ret
>= 200) {
1139 ERROR("string too long");
1143 int hostgid_mapped
= mapped_hostid(getegid(), conf
, ID_TYPE_GID
);
1144 extraargs
= hostgid_mapped
>= 0 ? 1 : 3;
1145 n2
= realloc(n2
, (nargs
+ n2args
+ extraargs
) * sizeof(char *));
1148 if (hostgid_mapped
< 0) {
1149 hostgid_mapped
= find_unmapped_nsuid(conf
, ID_TYPE_GID
);
1150 n2
[n2args
++] = "-m";
1151 if (hostgid_mapped
< 0) {
1152 ERROR("Could not find free uid to map");
1155 n2
[n2args
++] = malloc(200);
1156 if (!n2
[n2args
-1]) {
1157 SYSERROR("out of memory");
1160 ret
= snprintf(n2
[n2args
-1], 200, "g:%d:%d:1",
1161 hostgid_mapped
, getegid());
1162 if (ret
< 0 || ret
>= 200) {
1163 ERROR("string too long");
1167 n2
[n2args
++] = "--";
1168 for (i
= 0; i
< nargs
; i
++)
1169 n2
[i
+ n2args
] = newargv
[i
];
1171 // Finally add "--mapped-uid $uid" to tell template what to chown
1174 n2
= realloc(n2
, n2args
* sizeof(char *));
1176 SYSERROR("out of memory");
1179 // note n2[n2args-1] is NULL
1180 n2
[n2args
-5] = "--mapped-uid";
1181 snprintf(txtuid
, 20, "%d", hostid_mapped
);
1182 n2
[n2args
-4] = txtuid
;
1183 n2
[n2args
-3] = "--mapped-gid";
1184 snprintf(txtgid
, 20, "%d", hostgid_mapped
);
1185 n2
[n2args
-2] = txtgid
;
1186 n2
[n2args
-1] = NULL
;
1191 execvp(tpath
, newargv
);
1192 SYSERROR("failed to execute template %s", tpath
);
1196 if (wait_for_pid(pid
) != 0) {
1197 ERROR("container creation template for %s failed", c
->name
);
1204 static bool prepend_lxc_header(char *path
, const char *t
, char *const argv
[])
1212 unsigned char md_value
[SHA_DIGEST_LENGTH
];
1216 f
= fopen(path
, "r");
1220 if (fseek(f
, 0, SEEK_END
) < 0)
1222 if ((flen
= ftell(f
)) < 0)
1224 if (fseek(f
, 0, SEEK_SET
) < 0)
1226 if ((contents
= malloc(flen
+ 1)) == NULL
)
1228 if (fread(contents
, 1, flen
, f
) != flen
)
1229 goto out_free_contents
;
1231 contents
[flen
] = '\0';
1235 goto out_free_contents
;
1238 tpath
= get_template_path(t
);
1240 ERROR("bad template: %s", t
);
1241 goto out_free_contents
;
1244 ret
= sha1sum_file(tpath
, md_value
);
1246 ERROR("Error getting sha1sum of %s", tpath
);
1248 goto out_free_contents
;
1253 f
= fopen(path
, "w");
1255 SYSERROR("reopening config for writing");
1259 fprintf(f
, "# Template used to create this container: %s\n", t
);
1261 fprintf(f
, "# Parameters passed to the template:");
1263 fprintf(f
, " %s", *argv
);
1269 fprintf(f
, "# Template script checksum (SHA-1): ");
1270 for (i
=0; i
<SHA_DIGEST_LENGTH
; i
++)
1271 fprintf(f
, "%02x", md_value
[i
]);
1274 fprintf(f
, "# For additional config options, please look at lxc.container.conf(5)\n");
1275 if (fwrite(contents
, 1, flen
, f
) != flen
) {
1276 SYSERROR("Writing original contents");
1292 SYSERROR("Error prepending header");
1298 static void lxcapi_clear_config(struct lxc_container
*c
)
1302 lxc_conf_free(c
->lxc_conf
);
1308 #define do_lxcapi_clear_config(c) lxcapi_clear_config(c)
1312 * create a container with the given parameters.
1313 * @c: container to be created. It has the lxcpath, name, and a starting
1314 * configuration already set
1315 * @t: the template to execute to instantiate the root filesystem and
1316 * adjust the configuration.
1317 * @bdevtype: backing store type to use. If NULL, dir will be used.
1318 * @specs: additional parameters for the backing store, i.e. LVM vg to
1321 * @argv: the arguments to pass to the template, terminated by NULL. If no
1322 * arguments, you can just pass NULL.
1324 static bool do_lxcapi_create(struct lxc_container
*c
, const char *t
,
1325 const char *bdevtype
, struct bdev_specs
*specs
, int flags
,
1337 tpath
= get_template_path(t
);
1339 ERROR("bad template: %s", t
);
1345 * If a template is passed in, and the rootfs already is defined in
1346 * the container config and exists, then * caller is trying to create
1347 * an existing container. Return an error, but do NOT delete the
1350 if (do_lxcapi_is_defined(c
) && c
->lxc_conf
&& c
->lxc_conf
->rootfs
.path
&&
1351 access(c
->lxc_conf
->rootfs
.path
, F_OK
) == 0 && tpath
) {
1352 ERROR("Container %s:%s already exists", c
->config_path
, c
->name
);
1357 if (!do_lxcapi_load_config(c
, lxc_global_config_value("lxc.default_config"))) {
1358 ERROR("Error loading default configuration file %s", lxc_global_config_value("lxc.default_config"));
1363 if (!create_container_dir(c
))
1367 * either template or rootfs.path should be set.
1368 * if both template and rootfs.path are set, template is setup as rootfs.path.
1369 * container is already created if we have a config and rootfs.path is accessible
1371 if (!c
->lxc_conf
->rootfs
.path
&& !tpath
)
1372 /* no template passed in and rootfs does not exist: error */
1374 if (c
->lxc_conf
->rootfs
.path
&& access(c
->lxc_conf
->rootfs
.path
, F_OK
) != 0)
1375 /* rootfs passed into configuration, but does not exist: error */
1377 if (do_lxcapi_is_defined(c
) && c
->lxc_conf
->rootfs
.path
&& !tpath
) {
1378 /* Rootfs already existed, user just wanted to save the
1379 * loaded configuration */
1384 /* Mark that this container is being created */
1385 if ((partial_fd
= create_partial(c
)) < 0)
1388 /* no need to get disk lock bc we have the partial locked */
1391 * Create the backing store
1392 * Note we can't do this in the same task as we use to execute the
1393 * template because of the way zfs works.
1394 * After you 'zfs create', zfs mounts the fs only in the initial
1399 SYSERROR("failed to fork task for container creation template");
1403 if (pid
== 0) { // child
1404 struct bdev
*bdev
= NULL
;
1406 if (!(bdev
= do_bdev_create(c
, bdevtype
, specs
))) {
1407 ERROR("Error creating backing store type %s for %s",
1408 bdevtype
? bdevtype
: "(none)", c
->name
);
1412 /* save config file again to store the new rootfs location */
1413 if (!do_lxcapi_save_config(c
, NULL
)) {
1414 ERROR("failed to save starting configuration for %s", c
->name
);
1415 // parent task won't see bdev in config so we delete it
1416 bdev
->ops
->umount(bdev
);
1417 bdev
->ops
->destroy(bdev
);
1422 if (wait_for_pid(pid
) != 0)
1425 /* reload config to get the rootfs */
1426 lxc_conf_free(c
->lxc_conf
);
1428 if (!load_config_locked(c
, c
->configfile
))
1431 if (!create_run_template(c
, tpath
, !!(flags
& LXC_CREATE_QUIET
), argv
))
1434 // now clear out the lxc_conf we have, reload from the created
1436 do_lxcapi_clear_config(c
);
1439 if (!prepend_lxc_header(c
->configfile
, tpath
, argv
)) {
1440 ERROR("Error prepending header to configuration file");
1444 ret
= load_config_locked(c
, c
->configfile
);
1447 if (partial_fd
>= 0)
1448 remove_partial(c
, partial_fd
);
1451 container_destroy(c
);
1457 static bool lxcapi_create(struct lxc_container
*c
, const char *t
,
1458 const char *bdevtype
, struct bdev_specs
*specs
, int flags
,
1462 current_config
= c
? c
->lxc_conf
: NULL
;
1463 ret
= do_lxcapi_create(c
, t
, bdevtype
, specs
, flags
, argv
);
1464 current_config
= NULL
;
1468 static bool do_lxcapi_reboot(struct lxc_container
*c
)
1471 int rebootsignal
= SIGINT
;
1475 if (!do_lxcapi_is_running(c
))
1477 pid
= do_lxcapi_init_pid(c
);
1480 if (c
->lxc_conf
&& c
->lxc_conf
->rebootsignal
)
1481 rebootsignal
= c
->lxc_conf
->rebootsignal
;
1482 if (kill(pid
, rebootsignal
) < 0)
1488 WRAP_API(bool, lxcapi_reboot
)
1490 static bool do_lxcapi_shutdown(struct lxc_container
*c
, int timeout
)
1494 int haltsignal
= SIGPWR
;
1499 if (!do_lxcapi_is_running(c
))
1501 pid
= do_lxcapi_init_pid(c
);
1504 if (c
->lxc_conf
&& c
->lxc_conf
->haltsignal
)
1505 haltsignal
= c
->lxc_conf
->haltsignal
;
1506 kill(pid
, haltsignal
);
1507 retv
= do_lxcapi_wait(c
, "STOPPED", timeout
);
1511 WRAP_API_1(bool, lxcapi_shutdown
, int)
1513 static bool lxcapi_createl(struct lxc_container
*c
, const char *t
,
1514 const char *bdevtype
, struct bdev_specs
*specs
, int flags
, ...)
1523 current_config
= c
->lxc_conf
;
1526 * since we're going to wait for create to finish, I don't think we
1527 * need to get a copy of the arguments.
1529 va_start(ap
, flags
);
1530 args
= lxc_va_arg_list_to_argv(ap
, 0, 0);
1533 ERROR("Memory allocation error.");
1537 bret
= do_lxcapi_create(c
, t
, bdevtype
, specs
, flags
, args
);
1541 current_config
= NULL
;
1545 static void do_clear_unexp_config_line(struct lxc_conf
*conf
, const char *key
)
1547 if (strcmp(key
, "lxc.cgroup") == 0)
1548 clear_unexp_config_line(conf
, key
, true);
1549 else if (strcmp(key
, "lxc.network") == 0)
1550 clear_unexp_config_line(conf
, key
, true);
1551 else if (strcmp(key
, "lxc.hook") == 0)
1552 clear_unexp_config_line(conf
, key
, true);
1554 clear_unexp_config_line(conf
, key
, false);
1555 if (!do_append_unexp_config_line(conf
, key
, ""))
1556 WARN("Error clearing configuration for %s", key
);
1559 static bool do_lxcapi_clear_config_item(struct lxc_container
*c
, const char *key
)
1563 if (!c
|| !c
->lxc_conf
)
1565 if (container_mem_lock(c
))
1567 ret
= lxc_clear_config_item(c
->lxc_conf
, key
);
1569 do_clear_unexp_config_line(c
->lxc_conf
, key
);
1570 container_mem_unlock(c
);
1574 WRAP_API_1(bool, lxcapi_clear_config_item
, const char *)
1576 static inline bool enter_net_ns(struct lxc_container
*c
)
1578 pid_t pid
= do_lxcapi_init_pid(c
);
1580 if ((geteuid() != 0 || (c
->lxc_conf
&& !lxc_list_empty(&c
->lxc_conf
->id_map
))) && access("/proc/self/ns/user", F_OK
) == 0) {
1581 if (!switch_to_ns(pid
, "user"))
1584 return switch_to_ns(pid
, "net");
1587 // used by qsort and bsearch functions for comparing names
1588 static inline int string_cmp(char **first
, char **second
)
1590 return strcmp(*first
, *second
);
1593 // used by qsort and bsearch functions for comparing container names
1594 static inline int container_cmp(struct lxc_container
**first
, struct lxc_container
**second
)
1596 return strcmp((*first
)->name
, (*second
)->name
);
1599 static bool add_to_array(char ***names
, char *cname
, int pos
)
1601 char **newnames
= realloc(*names
, (pos
+1) * sizeof(char *));
1603 ERROR("Out of memory");
1608 newnames
[pos
] = strdup(cname
);
1612 // sort the arrray as we will use binary search on it
1613 qsort(newnames
, pos
+ 1, sizeof(char *), (int (*)(const void *,const void *))string_cmp
);
1618 static bool add_to_clist(struct lxc_container
***list
, struct lxc_container
*c
, int pos
, bool sort
)
1620 struct lxc_container
**newlist
= realloc(*list
, (pos
+1) * sizeof(struct lxc_container
*));
1622 ERROR("Out of memory");
1629 // sort the arrray as we will use binary search on it
1631 qsort(newlist
, pos
+ 1, sizeof(struct lxc_container
*), (int (*)(const void *,const void *))container_cmp
);
1636 static char** get_from_array(char ***names
, char *cname
, int size
)
1638 return (char **)bsearch(&cname
, *names
, size
, sizeof(char *), (int (*)(const void *, const void *))string_cmp
);
1642 static bool array_contains(char ***names
, char *cname
, int size
) {
1643 if(get_from_array(names
, cname
, size
) != NULL
)
1648 static bool remove_from_array(char ***names
, char *cname
, int size
)
1650 char **result
= get_from_array(names
, cname
, size
);
1651 if (result
!= NULL
) {
1658 static char ** do_lxcapi_get_interfaces(struct lxc_container
*c
)
1661 int i
, count
= 0, pipefd
[2];
1662 char **interfaces
= NULL
;
1663 char interface
[IFNAMSIZ
];
1665 if(pipe(pipefd
) < 0) {
1666 SYSERROR("pipe failed");
1672 SYSERROR("failed to fork task to get interfaces information");
1678 if (pid
== 0) { // child
1679 int ret
= 1, nbytes
;
1680 struct ifaddrs
*interfaceArray
= NULL
, *tempIfAddr
= NULL
;
1682 /* close the read-end of the pipe */
1685 if (!enter_net_ns(c
)) {
1686 SYSERROR("failed to enter namespace");
1690 /* Grab the list of interfaces */
1691 if (getifaddrs(&interfaceArray
)) {
1692 SYSERROR("failed to get interfaces list");
1696 /* Iterate through the interfaces */
1697 for (tempIfAddr
= interfaceArray
; tempIfAddr
!= NULL
; tempIfAddr
= tempIfAddr
->ifa_next
) {
1698 nbytes
= write(pipefd
[1], tempIfAddr
->ifa_name
, IFNAMSIZ
);
1700 ERROR("write failed");
1709 freeifaddrs(interfaceArray
);
1711 /* close the write-end of the pipe, thus sending EOF to the reader */
1716 /* close the write-end of the pipe */
1719 while (read(pipefd
[0], &interface
, IFNAMSIZ
) == IFNAMSIZ
) {
1720 if (array_contains(&interfaces
, interface
, count
))
1723 if(!add_to_array(&interfaces
, interface
, count
))
1724 ERROR("PARENT: add_to_array failed");
1728 if (wait_for_pid(pid
) != 0) {
1729 for(i
=0;i
<count
;i
++)
1730 free(interfaces
[i
]);
1735 /* close the read-end of the pipe */
1738 /* Append NULL to the array */
1740 interfaces
= (char **)lxc_append_null_to_array((void **)interfaces
, count
);
1745 WRAP_API(char **, lxcapi_get_interfaces
)
1747 static char** do_lxcapi_get_ips(struct lxc_container
*c
, const char* interface
, const char* family
, int scope
)
1750 int i
, count
= 0, pipefd
[2];
1751 char **addresses
= NULL
;
1752 char address
[INET6_ADDRSTRLEN
];
1754 if(pipe(pipefd
) < 0) {
1755 SYSERROR("pipe failed");
1761 SYSERROR("failed to fork task to get container ips");
1767 if (pid
== 0) { // child
1768 int ret
= 1, nbytes
;
1769 struct ifaddrs
*interfaceArray
= NULL
, *tempIfAddr
= NULL
;
1770 char addressOutputBuffer
[INET6_ADDRSTRLEN
];
1771 void *tempAddrPtr
= NULL
;
1772 char *address
= NULL
;
1774 /* close the read-end of the pipe */
1777 if (!enter_net_ns(c
)) {
1778 SYSERROR("failed to enter namespace");
1782 /* Grab the list of interfaces */
1783 if (getifaddrs(&interfaceArray
)) {
1784 SYSERROR("failed to get interfaces list");
1788 /* Iterate through the interfaces */
1789 for (tempIfAddr
= interfaceArray
; tempIfAddr
!= NULL
; tempIfAddr
= tempIfAddr
->ifa_next
) {
1790 if (tempIfAddr
->ifa_addr
== NULL
)
1793 if(tempIfAddr
->ifa_addr
->sa_family
== AF_INET
) {
1794 if (family
&& strcmp(family
, "inet"))
1796 tempAddrPtr
= &((struct sockaddr_in
*)tempIfAddr
->ifa_addr
)->sin_addr
;
1799 if (family
&& strcmp(family
, "inet6"))
1802 if (((struct sockaddr_in6
*)tempIfAddr
->ifa_addr
)->sin6_scope_id
!= scope
)
1805 tempAddrPtr
= &((struct sockaddr_in6
*)tempIfAddr
->ifa_addr
)->sin6_addr
;
1808 if (interface
&& strcmp(interface
, tempIfAddr
->ifa_name
))
1810 else if (!interface
&& strcmp("lo", tempIfAddr
->ifa_name
) == 0)
1813 address
= (char *)inet_ntop(tempIfAddr
->ifa_addr
->sa_family
,
1815 addressOutputBuffer
,
1816 sizeof(addressOutputBuffer
));
1820 nbytes
= write(pipefd
[1], address
, INET6_ADDRSTRLEN
);
1822 ERROR("write failed");
1831 freeifaddrs(interfaceArray
);
1833 /* close the write-end of the pipe, thus sending EOF to the reader */
1838 /* close the write-end of the pipe */
1841 while (read(pipefd
[0], &address
, INET6_ADDRSTRLEN
) == INET6_ADDRSTRLEN
) {
1842 if(!add_to_array(&addresses
, address
, count
))
1843 ERROR("PARENT: add_to_array failed");
1847 if (wait_for_pid(pid
) != 0) {
1848 for(i
=0;i
<count
;i
++)
1854 /* close the read-end of the pipe */
1857 /* Append NULL to the array */
1859 addresses
= (char **)lxc_append_null_to_array((void **)addresses
, count
);
1864 WRAP_API_3(char **, lxcapi_get_ips
, const char *, const char *, int)
1866 static int do_lxcapi_get_config_item(struct lxc_container
*c
, const char *key
, char *retv
, int inlen
)
1870 if (!c
|| !c
->lxc_conf
)
1872 if (container_mem_lock(c
))
1874 ret
= lxc_get_config_item(c
->lxc_conf
, key
, retv
, inlen
);
1875 container_mem_unlock(c
);
1879 WRAP_API_3(int, lxcapi_get_config_item
, const char *, char *, int)
1881 static char* do_lxcapi_get_running_config_item(struct lxc_container
*c
, const char *key
)
1885 if (!c
|| !c
->lxc_conf
)
1887 if (container_mem_lock(c
))
1889 ret
= lxc_cmd_get_config_item(c
->name
, key
, do_lxcapi_get_config_path(c
));
1890 container_mem_unlock(c
);
1894 WRAP_API_1(char *, lxcapi_get_running_config_item
, const char *)
1896 static int do_lxcapi_get_keys(struct lxc_container
*c
, const char *key
, char *retv
, int inlen
)
1899 return lxc_listconfigs(retv
, inlen
);
1901 * Support 'lxc.network.<idx>', i.e. 'lxc.network.0'
1902 * This is an intelligent result to show which keys are valid given
1903 * the type of nic it is
1905 if (!c
|| !c
->lxc_conf
)
1907 if (container_mem_lock(c
))
1910 if (strncmp(key
, "lxc.network.", 12) == 0)
1911 ret
= lxc_list_nicconfigs(c
->lxc_conf
, key
, retv
, inlen
);
1912 container_mem_unlock(c
);
1916 WRAP_API_3(int, lxcapi_get_keys
, const char *, char *, int)
1918 static bool do_lxcapi_save_config(struct lxc_container
*c
, const char *alt_file
)
1921 bool ret
= false, need_disklock
= false;
1925 alt_file
= c
->configfile
;
1927 return false; // should we write to stdout if no file is specified?
1929 // If we haven't yet loaded a config, load the stock config
1931 if (!do_lxcapi_load_config(c
, lxc_global_config_value("lxc.default_config"))) {
1932 ERROR("Error loading default configuration file %s while saving %s", lxc_global_config_value("lxc.default_config"), c
->name
);
1937 if (!create_container_dir(c
))
1941 * If we're writing to the container's config file, take the
1942 * disk lock. Otherwise just take the memlock to protect the
1943 * struct lxc_container while we're traversing it.
1945 if (strcmp(c
->configfile
, alt_file
) == 0)
1946 need_disklock
= true;
1949 lret
= container_disk_lock(c
);
1951 lret
= container_mem_lock(c
);
1956 fout
= fopen(alt_file
, "w");
1959 write_config(fout
, c
->lxc_conf
);
1965 container_disk_unlock(c
);
1967 container_mem_unlock(c
);
1971 WRAP_API_1(bool, lxcapi_save_config
, const char *)
1973 static bool mod_rdep(struct lxc_container
*c
, bool inc
)
1975 char path
[MAXPATHLEN
];
1980 if (container_disk_lock(c
))
1982 ret
= snprintf(path
, MAXPATHLEN
, "%s/%s/lxc_snapshots", c
->config_path
,
1984 if (ret
< 0 || ret
> MAXPATHLEN
)
1986 f
= fopen(path
, "r");
1988 ret
= fscanf(f
, "%d", &v
);
1991 ERROR("Corrupted file %s", path
);
1996 f
= fopen(path
, "w");
1999 if (fprintf(f
, "%d\n", v
) < 0) {
2000 ERROR("Error writing new snapshots value");
2006 SYSERROR("Error writing to or closing snapshots file");
2013 container_disk_unlock(c
);
2017 static void strip_newline(char *p
)
2019 size_t len
= strlen(p
);
2022 if (p
[len
-1] == '\n')
2026 static void mod_all_rdeps(struct lxc_container
*c
, bool inc
)
2028 struct lxc_container
*p
;
2029 char *lxcpath
= NULL
, *lxcname
= NULL
, path
[MAXPATHLEN
];
2030 size_t pathlen
= 0, namelen
= 0;
2034 ret
= snprintf(path
, MAXPATHLEN
, "%s/%s/lxc_rdepends",
2035 c
->config_path
, c
->name
);
2036 if (ret
< 0 || ret
>= MAXPATHLEN
) {
2037 ERROR("Path name too long");
2040 f
= fopen(path
, "r");
2043 while (getline(&lxcpath
, &pathlen
, f
) != -1) {
2044 if (getline(&lxcname
, &namelen
, f
) == -1) {
2045 ERROR("badly formatted file %s", path
);
2048 strip_newline(lxcpath
);
2049 strip_newline(lxcname
);
2050 if ((p
= lxc_container_new(lxcname
, lxcpath
)) == NULL
) {
2051 ERROR("Unable to find dependent container %s:%s",
2055 if (!mod_rdep(p
, inc
))
2056 ERROR("Failed to increase numsnapshots for %s:%s",
2058 lxc_container_put(p
);
2066 static bool has_fs_snapshots(struct lxc_container
*c
)
2068 char path
[MAXPATHLEN
];
2073 ret
= snprintf(path
, MAXPATHLEN
, "%s/%s/lxc_snapshots", c
->config_path
,
2075 if (ret
< 0 || ret
> MAXPATHLEN
)
2077 f
= fopen(path
, "r");
2080 ret
= fscanf(f
, "%d", &v
);
2090 static bool has_snapshots(struct lxc_container
*c
)
2092 char path
[MAXPATHLEN
];
2093 struct dirent dirent
, *direntp
;
2097 if (!get_snappath_dir(c
, path
))
2099 dir
= opendir(path
);
2102 while (!readdir_r(dir
, &dirent
, &direntp
)) {
2106 if (!strcmp(direntp
->d_name
, "."))
2109 if (!strcmp(direntp
->d_name
, ".."))
2118 static int lxc_rmdir_onedev_wrapper(void *data
)
2120 char *arg
= (char *) data
;
2121 return lxc_rmdir_onedev(arg
, "snaps");
2124 static int do_bdev_destroy(struct lxc_conf
*conf
)
2129 r
= bdev_init(conf
, conf
->rootfs
.path
, conf
->rootfs
.mount
, NULL
);
2133 if (r
->ops
->destroy(r
) < 0)
2139 static int bdev_destroy_wrapper(void *data
)
2141 struct lxc_conf
*conf
= data
;
2143 if (setgid(0) < 0) {
2144 ERROR("Failed to setgid to 0");
2147 if (setgroups(0, NULL
) < 0)
2148 WARN("Failed to clear groups");
2149 if (setuid(0) < 0) {
2150 ERROR("Failed to setuid to 0");
2153 return do_bdev_destroy(conf
);
2156 static bool container_destroy(struct lxc_container
*c
)
2160 struct lxc_conf
*conf
;
2162 if (!c
|| !do_lxcapi_is_defined(c
))
2166 if (container_disk_lock(c
))
2169 if (!is_stopped(c
)) {
2170 // we should queue some sort of error - in c->error_string?
2171 ERROR("container %s is not stopped", c
->name
);
2175 if (conf
&& !lxc_list_empty(&conf
->hooks
[LXCHOOK_DESTROY
])) {
2176 /* Start of environment variable setup for hooks */
2177 if (setenv("LXC_NAME", c
->name
, 1)) {
2178 SYSERROR("failed to set environment variable for container name");
2180 if (setenv("LXC_CONFIG_FILE", conf
->rcfile
, 1)) {
2181 SYSERROR("failed to set environment variable for config path");
2183 if (setenv("LXC_ROOTFS_MOUNT", conf
->rootfs
.mount
, 1)) {
2184 SYSERROR("failed to set environment variable for rootfs mount");
2186 if (setenv("LXC_ROOTFS_PATH", conf
->rootfs
.path
, 1)) {
2187 SYSERROR("failed to set environment variable for rootfs mount");
2189 if (conf
->console
.path
&& setenv("LXC_CONSOLE", conf
->console
.path
, 1)) {
2190 SYSERROR("failed to set environment variable for console path");
2192 if (conf
->console
.log_path
&& setenv("LXC_CONSOLE_LOGPATH", conf
->console
.log_path
, 1)) {
2193 SYSERROR("failed to set environment variable for console log");
2195 /* End of environment variable setup for hooks */
2197 if (run_lxc_hooks(c
->name
, "destroy", conf
, c
->get_config_path(c
), NULL
)) {
2198 ERROR("Error executing clone hook for %s", c
->name
);
2203 if (current_config
&& conf
== current_config
) {
2204 current_config
= NULL
;
2205 if (conf
->logfd
!= -1) {
2211 if (conf
&& conf
->rootfs
.path
&& conf
->rootfs
.mount
) {
2213 ret
= userns_exec_1(conf
, bdev_destroy_wrapper
, conf
);
2215 ret
= do_bdev_destroy(conf
);
2217 ERROR("Error destroying rootfs for %s", c
->name
);
2222 mod_all_rdeps(c
, false);
2224 const char *p1
= do_lxcapi_get_config_path(c
);
2225 char *path
= alloca(strlen(p1
) + strlen(c
->name
) + 2);
2226 sprintf(path
, "%s/%s", p1
, c
->name
);
2228 ret
= userns_exec_1(conf
, lxc_rmdir_onedev_wrapper
, path
);
2230 ret
= lxc_rmdir_onedev(path
, "snaps");
2232 ERROR("Error destroying container directory for %s", c
->name
);
2238 container_disk_unlock(c
);
2242 static bool do_lxcapi_destroy(struct lxc_container
*c
)
2244 if (!c
|| !lxcapi_is_defined(c
))
2246 if (has_snapshots(c
)) {
2247 ERROR("Container %s has snapshots; not removing", c
->name
);
2251 if (has_fs_snapshots(c
)) {
2252 ERROR("container %s has snapshots on its rootfs", c
->name
);
2256 return container_destroy(c
);
2259 WRAP_API(bool, lxcapi_destroy
)
2261 static bool do_lxcapi_destroy_with_snapshots(struct lxc_container
*c
)
2263 if (!c
|| !lxcapi_is_defined(c
))
2265 if (!lxcapi_snapshot_destroy_all(c
)) {
2266 ERROR("Error deleting all snapshots");
2269 return lxcapi_destroy(c
);
2272 WRAP_API(bool, lxcapi_destroy_with_snapshots
)
2274 static bool set_config_item_locked(struct lxc_container
*c
, const char *key
, const char *v
)
2276 struct lxc_config_t
*config
;
2279 c
->lxc_conf
= lxc_conf_init();
2282 config
= lxc_getconfig(key
);
2285 if (config
->cb(key
, v
, c
->lxc_conf
) != 0)
2287 return do_append_unexp_config_line(c
->lxc_conf
, key
, v
);
2290 static bool do_lxcapi_set_config_item(struct lxc_container
*c
, const char *key
, const char *v
)
2297 if (container_mem_lock(c
))
2300 b
= set_config_item_locked(c
, key
, v
);
2302 container_mem_unlock(c
);
2306 WRAP_API_2(bool, lxcapi_set_config_item
, const char *, const char *)
2308 static char *lxcapi_config_file_name(struct lxc_container
*c
)
2310 if (!c
|| !c
->configfile
)
2312 return strdup(c
->configfile
);
2315 static const char *lxcapi_get_config_path(struct lxc_container
*c
)
2317 if (!c
|| !c
->config_path
)
2319 return (const char *)(c
->config_path
);
2324 * Just recalculate the c->configfile based on the
2325 * c->config_path, which must be set.
2326 * The lxc_container must be locked or not yet public.
2328 static bool set_config_filename(struct lxc_container
*c
)
2333 if (!c
->config_path
)
2336 /* $lxc_path + "/" + c->name + "/" + "config" + '\0' */
2337 len
= strlen(c
->config_path
) + strlen(c
->name
) + strlen("config") + 3;
2338 newpath
= malloc(len
);
2342 ret
= snprintf(newpath
, len
, "%s/%s/config", c
->config_path
, c
->name
);
2343 if (ret
< 0 || ret
>= len
) {
2344 fprintf(stderr
, "Error printing out config file name\n");
2349 free(c
->configfile
);
2350 c
->configfile
= newpath
;
2355 static bool do_lxcapi_set_config_path(struct lxc_container
*c
, const char *path
)
2359 char *oldpath
= NULL
;
2364 if (container_mem_lock(c
))
2369 ERROR("Out of memory setting new lxc path");
2375 oldpath
= c
->config_path
;
2378 /* Since we've changed the config path, we have to change the
2379 * config file name too */
2380 if (!set_config_filename(c
)) {
2381 ERROR("Out of memory setting new config filename");
2383 free(c
->config_path
);
2384 c
->config_path
= oldpath
;
2389 container_mem_unlock(c
);
2393 WRAP_API_1(bool, lxcapi_set_config_path
, const char *)
2395 static bool do_lxcapi_set_cgroup_item(struct lxc_container
*c
, const char *subsys
, const char *value
)
2405 if (container_disk_lock(c
))
2408 ret
= lxc_cgroup_set(subsys
, value
, c
->name
, c
->config_path
);
2410 container_disk_unlock(c
);
2414 WRAP_API_2(bool, lxcapi_set_cgroup_item
, const char *, const char *)
2416 static int do_lxcapi_get_cgroup_item(struct lxc_container
*c
, const char *subsys
, char *retv
, int inlen
)
2426 if (container_disk_lock(c
))
2429 ret
= lxc_cgroup_get(subsys
, retv
, inlen
, c
->name
, c
->config_path
);
2431 container_disk_unlock(c
);
2435 WRAP_API_3(int, lxcapi_get_cgroup_item
, const char *, char *, int)
2437 const char *lxc_get_global_config_item(const char *key
)
2439 return lxc_global_config_value(key
);
2442 const char *lxc_get_version(void)
2447 static int copy_file(const char *old
, const char *new)
2454 if (file_exists(new)) {
2455 ERROR("copy destination %s exists", new);
2458 ret
= stat(old
, &sbuf
);
2460 INFO("Error stat'ing %s", old
);
2464 in
= open(old
, O_RDONLY
);
2466 SYSERROR("Error opening original file %s", old
);
2469 out
= open(new, O_CREAT
| O_EXCL
| O_WRONLY
, 0644);
2471 SYSERROR("Error opening new file %s", new);
2477 len
= read(in
, buf
, 8096);
2479 SYSERROR("Error reading old file %s", old
);
2484 ret
= write(out
, buf
, len
);
2485 if (ret
< len
) { // should we retry?
2486 SYSERROR("Error: write to new file %s was interrupted", new);
2493 // we set mode, but not owner/group
2494 ret
= chmod(new, sbuf
.st_mode
);
2496 SYSERROR("Error setting mode on %s", new);
2508 static int copyhooks(struct lxc_container
*oldc
, struct lxc_container
*c
)
2511 struct lxc_list
*it
;
2514 len
= strlen(oldc
->config_path
) + strlen(oldc
->name
) + 3;
2515 cpath
= alloca(len
);
2516 ret
= snprintf(cpath
, len
, "%s/%s/", oldc
->config_path
, oldc
->name
);
2517 if (ret
< 0 || ret
>= len
)
2520 for (i
=0; i
<NUM_LXC_HOOKS
; i
++) {
2521 lxc_list_for_each(it
, &c
->lxc_conf
->hooks
[i
]) {
2522 char *hookname
= it
->elem
;
2523 char *fname
= strrchr(hookname
, '/');
2524 char tmppath
[MAXPATHLEN
];
2525 if (!fname
) // relative path - we don't support, but maybe we should
2527 if (strncmp(hookname
, cpath
, len
- 1) != 0) {
2528 // this hook is public - ignore
2531 // copy the script, and change the entry in confile
2532 ret
= snprintf(tmppath
, MAXPATHLEN
, "%s/%s/%s",
2533 c
->config_path
, c
->name
, fname
+1);
2534 if (ret
< 0 || ret
>= MAXPATHLEN
)
2536 ret
= copy_file(it
->elem
, tmppath
);
2540 it
->elem
= strdup(tmppath
);
2542 ERROR("out of memory copying hook path");
2548 if (!clone_update_unexp_hooks(c
->lxc_conf
, oldc
->config_path
,
2549 c
->config_path
, oldc
->name
, c
->name
)) {
2550 ERROR("Error saving new hooks in clone");
2553 do_lxcapi_save_config(c
, NULL
);
2558 static int copy_fstab(struct lxc_container
*oldc
, struct lxc_container
*c
)
2560 char newpath
[MAXPATHLEN
];
2561 char *oldpath
= oldc
->lxc_conf
->fstab
;
2567 clear_unexp_config_line(c
->lxc_conf
, "lxc.mount", false);
2569 char *p
= strrchr(oldpath
, '/');
2572 ret
= snprintf(newpath
, MAXPATHLEN
, "%s/%s%s",
2573 c
->config_path
, c
->name
, p
);
2574 if (ret
< 0 || ret
>= MAXPATHLEN
) {
2575 ERROR("error printing new path for %s", oldpath
);
2578 if (file_exists(newpath
)) {
2579 ERROR("error: fstab file %s exists", newpath
);
2583 if (copy_file(oldpath
, newpath
) < 0) {
2584 ERROR("error: copying %s to %s", oldpath
, newpath
);
2587 free(c
->lxc_conf
->fstab
);
2588 c
->lxc_conf
->fstab
= strdup(newpath
);
2589 if (!c
->lxc_conf
->fstab
) {
2590 ERROR("error: allocating pathname");
2593 if (!do_append_unexp_config_line(c
->lxc_conf
, "lxc.mount", newpath
)) {
2594 ERROR("error saving new lxctab");
2601 static void copy_rdepends(struct lxc_container
*c
, struct lxc_container
*c0
)
2603 char path0
[MAXPATHLEN
], path1
[MAXPATHLEN
];
2606 ret
= snprintf(path0
, MAXPATHLEN
, "%s/%s/lxc_rdepends", c0
->config_path
,
2608 if (ret
< 0 || ret
>= MAXPATHLEN
) {
2609 WARN("Error copying reverse dependencies");
2612 ret
= snprintf(path1
, MAXPATHLEN
, "%s/%s/lxc_rdepends", c
->config_path
,
2614 if (ret
< 0 || ret
>= MAXPATHLEN
) {
2615 WARN("Error copying reverse dependencies");
2618 if (copy_file(path0
, path1
) < 0) {
2619 INFO("Error copying reverse dependencies");
2624 static bool add_rdepends(struct lxc_container
*c
, struct lxc_container
*c0
)
2627 char path
[MAXPATHLEN
];
2631 ret
= snprintf(path
, MAXPATHLEN
, "%s/%s/lxc_rdepends", c
->config_path
,
2633 if (ret
< 0 || ret
>= MAXPATHLEN
)
2635 f
= fopen(path
, "a");
2639 // if anything goes wrong, just return an error
2640 if (fprintf(f
, "%s\n%s\n", c0
->config_path
, c0
->name
) < 0)
2647 static int copy_storage(struct lxc_container
*c0
, struct lxc_container
*c
,
2648 const char *newtype
, int flags
, const char *bdevdata
, uint64_t newsize
)
2653 bdev
= bdev_copy(c0
, c
->name
, c
->config_path
, newtype
, flags
,
2654 bdevdata
, newsize
, &need_rdep
);
2656 ERROR("Error copying storage");
2659 free(c
->lxc_conf
->rootfs
.path
);
2660 c
->lxc_conf
->rootfs
.path
= strdup(bdev
->src
);
2662 if (!c
->lxc_conf
->rootfs
.path
) {
2663 ERROR("Out of memory while setting storage path");
2666 // We will simply append a new lxc.rootfs entry to the unexpanded config
2667 clear_unexp_config_line(c
->lxc_conf
, "lxc.rootfs", false);
2668 if (!do_append_unexp_config_line(c
->lxc_conf
, "lxc.rootfs", c
->lxc_conf
->rootfs
.path
)) {
2669 ERROR("Error saving new rootfs to cloend config");
2672 if (flags
& LXC_CLONE_SNAPSHOT
)
2673 copy_rdepends(c
, c0
);
2675 if (!add_rdepends(c
, c0
))
2676 WARN("Error adding reverse dependency from %s to %s",
2680 mod_all_rdeps(c
, true);
2685 struct clone_update_data
{
2686 struct lxc_container
*c0
;
2687 struct lxc_container
*c1
;
2692 static int clone_update_rootfs(struct clone_update_data
*data
)
2694 struct lxc_container
*c0
= data
->c0
;
2695 struct lxc_container
*c
= data
->c1
;
2696 int flags
= data
->flags
;
2697 char **hookargs
= data
->hookargs
;
2699 char path
[MAXPATHLEN
];
2702 struct lxc_conf
*conf
= c
->lxc_conf
;
2704 /* update hostname in rootfs */
2705 /* we're going to mount, so run in a clean namespace to simplify cleanup */
2707 if (setgid(0) < 0) {
2708 ERROR("Failed to setgid to 0");
2711 if (setuid(0) < 0) {
2712 ERROR("Failed to setuid to 0");
2715 if (setgroups(0, NULL
) < 0)
2716 WARN("Failed to clear groups");
2718 if (unshare(CLONE_NEWNS
) < 0)
2720 bdev
= bdev_init(c
->lxc_conf
, c
->lxc_conf
->rootfs
.path
, c
->lxc_conf
->rootfs
.mount
, NULL
);
2723 if (strcmp(bdev
->type
, "dir") != 0) {
2724 if (unshare(CLONE_NEWNS
) < 0) {
2725 ERROR("error unsharing mounts");
2729 if (detect_shared_rootfs()) {
2730 if (mount(NULL
, "/", NULL
, MS_SLAVE
|MS_REC
, NULL
)) {
2731 SYSERROR("Failed to make / rslave");
2732 ERROR("Continuing...");
2735 if (bdev
->ops
->mount(bdev
) < 0) {
2739 } else { // TODO come up with a better way
2741 bdev
->dest
= strdup(bdev
->src
);
2744 if (!lxc_list_empty(&conf
->hooks
[LXCHOOK_CLONE
])) {
2745 /* Start of environment variable setup for hooks */
2746 if (setenv("LXC_SRC_NAME", c0
->name
, 1)) {
2747 SYSERROR("failed to set environment variable for source container name");
2749 if (setenv("LXC_NAME", c
->name
, 1)) {
2750 SYSERROR("failed to set environment variable for container name");
2752 if (setenv("LXC_CONFIG_FILE", conf
->rcfile
, 1)) {
2753 SYSERROR("failed to set environment variable for config path");
2755 if (setenv("LXC_ROOTFS_MOUNT", bdev
->dest
, 1)) {
2756 SYSERROR("failed to set environment variable for rootfs mount");
2758 if (setenv("LXC_ROOTFS_PATH", conf
->rootfs
.path
, 1)) {
2759 SYSERROR("failed to set environment variable for rootfs mount");
2762 if (run_lxc_hooks(c
->name
, "clone", conf
, c
->get_config_path(c
), hookargs
)) {
2763 ERROR("Error executing clone hook for %s", c
->name
);
2769 if (!(flags
& LXC_CLONE_KEEPNAME
)) {
2770 ret
= snprintf(path
, MAXPATHLEN
, "%s/etc/hostname", bdev
->dest
);
2773 if (ret
< 0 || ret
>= MAXPATHLEN
)
2775 if (!file_exists(path
))
2777 if (!(fout
= fopen(path
, "w"))) {
2778 SYSERROR("unable to open %s: ignoring", path
);
2781 if (fprintf(fout
, "%s", c
->name
) < 0) {
2785 if (fclose(fout
) < 0)
2794 static int clone_update_rootfs_wrapper(void *data
)
2796 struct clone_update_data
*arg
= (struct clone_update_data
*) data
;
2797 return clone_update_rootfs(arg
);
2801 * We want to support:
2802 sudo lxc-clone -o o1 -n n1 -s -L|-fssize fssize -v|--vgname vgname \
2803 -p|--lvprefix lvprefix -t|--fstype fstype -B backingstore
2805 -s [ implies overlayfs]
2809 only rootfs gets converted (copied/snapshotted) on clone.
2812 static int create_file_dirname(char *path
, struct lxc_conf
*conf
)
2814 char *p
= strrchr(path
, '/');
2820 ret
= do_create_container_dir(path
, conf
);
2825 static struct lxc_container
*do_lxcapi_clone(struct lxc_container
*c
, const char *newname
,
2826 const char *lxcpath
, int flags
,
2827 const char *bdevtype
, const char *bdevdata
, uint64_t newsize
,
2830 struct lxc_container
*c2
= NULL
;
2831 char newpath
[MAXPATHLEN
];
2832 int ret
, storage_copied
= 0;
2833 char *origroot
= NULL
;
2834 struct clone_update_data data
;
2838 if (!c
|| !do_lxcapi_is_defined(c
))
2841 if (container_mem_lock(c
))
2844 if (!is_stopped(c
)) {
2845 ERROR("error: Original container (%s) is running", c
->name
);
2849 // Make sure the container doesn't yet exist.
2853 lxcpath
= do_lxcapi_get_config_path(c
);
2854 ret
= snprintf(newpath
, MAXPATHLEN
, "%s/%s/config", lxcpath
, newname
);
2855 if (ret
< 0 || ret
>= MAXPATHLEN
) {
2856 SYSERROR("clone: failed making config pathname");
2859 if (file_exists(newpath
)) {
2860 ERROR("error: clone: %s exists", newpath
);
2864 ret
= create_file_dirname(newpath
, c
->lxc_conf
);
2865 if (ret
< 0 && errno
!= EEXIST
) {
2866 ERROR("Error creating container dir for %s", newpath
);
2870 // copy the configuration, tweak it as needed,
2871 if (c
->lxc_conf
->rootfs
.path
) {
2872 origroot
= c
->lxc_conf
->rootfs
.path
;
2873 c
->lxc_conf
->rootfs
.path
= NULL
;
2875 fout
= fopen(newpath
, "w");
2877 SYSERROR("open %s", newpath
);
2880 write_config(fout
, c
->lxc_conf
);
2882 c
->lxc_conf
->rootfs
.path
= origroot
;
2884 sprintf(newpath
, "%s/%s/rootfs", lxcpath
, newname
);
2885 if (mkdir(newpath
, 0755) < 0) {
2886 SYSERROR("error creating %s", newpath
);
2891 if (chown_mapped_root(newpath
, c
->lxc_conf
) < 0) {
2892 ERROR("Error chowning %s to container root", newpath
);
2897 c2
= lxc_container_new(newname
, lxcpath
);
2899 ERROR("clone: failed to create new container (%s %s)", newname
,
2904 // copy/snapshot rootfs's
2905 ret
= copy_storage(c
, c2
, bdevtype
, flags
, bdevdata
, newsize
);
2909 clear_unexp_config_line(c2
->lxc_conf
, "lxc.utsname", false);
2912 if (!set_config_item_locked(c2
, "lxc.utsname", newname
)) {
2913 ERROR("Error setting new hostname");
2918 ret
= copyhooks(c
, c2
);
2920 ERROR("error copying hooks");
2924 if (copy_fstab(c
, c2
) < 0) {
2925 ERROR("error copying fstab");
2930 if (!(flags
& LXC_CLONE_KEEPMACADDR
)) {
2931 if (!network_new_hwaddrs(c2
->lxc_conf
)) {
2932 ERROR("Error updating mac addresses");
2937 // We've now successfully created c2's storage, so clear it out if we
2941 if (!c2
->save_config(c2
, NULL
))
2944 if ((pid
= fork()) < 0) {
2949 ret
= wait_for_pid(pid
);
2952 container_mem_unlock(c
);
2958 data
.hookargs
= hookargs
;
2960 ret
= userns_exec_1(c
->lxc_conf
, clone_update_rootfs_wrapper
,
2963 ret
= clone_update_rootfs(&data
);
2967 container_mem_unlock(c
);
2971 container_mem_unlock(c
);
2973 if (!storage_copied
)
2974 c2
->lxc_conf
->rootfs
.path
= NULL
;
2976 lxc_container_put(c2
);
2982 static struct lxc_container
*lxcapi_clone(struct lxc_container
*c
, const char *newname
,
2983 const char *lxcpath
, int flags
,
2984 const char *bdevtype
, const char *bdevdata
, uint64_t newsize
,
2987 struct lxc_container
* ret
;
2988 current_config
= c
? c
->lxc_conf
: NULL
;
2989 ret
= do_lxcapi_clone(c
, newname
, lxcpath
, flags
, bdevtype
, bdevdata
, newsize
, hookargs
);
2990 current_config
= NULL
;
2994 static bool do_lxcapi_rename(struct lxc_container
*c
, const char *newname
)
2997 struct lxc_container
*newc
;
2999 if (!c
|| !c
->name
|| !c
->config_path
|| !c
->lxc_conf
)
3002 if (has_fs_snapshots(c
) || has_snapshots(c
)) {
3003 ERROR("Renaming a container with snapshots is not supported");
3006 bdev
= bdev_init(c
->lxc_conf
, c
->lxc_conf
->rootfs
.path
, c
->lxc_conf
->rootfs
.mount
, NULL
);
3008 ERROR("Failed to find original backing store type");
3012 newc
= lxcapi_clone(c
, newname
, c
->config_path
, LXC_CLONE_KEEPMACADDR
, NULL
, bdev
->type
, 0, NULL
);
3015 lxc_container_put(newc
);
3019 if (newc
&& lxcapi_is_defined(newc
))
3020 lxc_container_put(newc
);
3022 if (!container_destroy(c
)) {
3023 ERROR("Could not destroy existing container %s", c
->name
);
3029 WRAP_API_1(bool, lxcapi_rename
, const char *)
3031 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
)
3038 current_config
= c
->lxc_conf
;
3040 ret
= lxc_attach(c
->name
, c
->config_path
, exec_function
, exec_payload
, options
, attached_process
);
3041 current_config
= NULL
;
3045 static int do_lxcapi_attach_run_wait(struct lxc_container
*c
, lxc_attach_options_t
*options
, const char *program
, const char * const argv
[])
3047 lxc_attach_command_t command
;
3054 command
.program
= (char*)program
;
3055 command
.argv
= (char**)argv
;
3056 r
= lxc_attach(c
->name
, c
->config_path
, lxc_attach_run_command
, &command
, options
, &pid
);
3061 return lxc_wait_for_pid_status(pid
);
3064 static int lxcapi_attach_run_wait(struct lxc_container
*c
, lxc_attach_options_t
*options
, const char *program
, const char * const argv
[])
3067 current_config
= c
? c
->lxc_conf
: NULL
;
3068 ret
= do_lxcapi_attach_run_wait(c
, options
, program
, argv
);
3069 current_config
= NULL
;
3073 static int get_next_index(const char *lxcpath
, char *cname
)
3079 fname
= alloca(strlen(lxcpath
) + 20);
3081 sprintf(fname
, "%s/snap%d", lxcpath
, i
);
3082 ret
= stat(fname
, &sb
);
3089 static bool get_snappath_dir(struct lxc_container
*c
, char *snappath
)
3093 * If the old style snapshot path exists, use it
3094 * /var/lib/lxc -> /var/lib/lxcsnaps
3096 ret
= snprintf(snappath
, MAXPATHLEN
, "%ssnaps", c
->config_path
);
3097 if (ret
< 0 || ret
>= MAXPATHLEN
)
3099 if (dir_exists(snappath
)) {
3100 ret
= snprintf(snappath
, MAXPATHLEN
, "%ssnaps/%s", c
->config_path
, c
->name
);
3101 if (ret
< 0 || ret
>= MAXPATHLEN
)
3107 * Use the new style path
3108 * /var/lib/lxc -> /var/lib/lxc + c->name + /snaps + \0
3110 ret
= snprintf(snappath
, MAXPATHLEN
, "%s/%s/snaps", c
->config_path
, c
->name
);
3111 if (ret
< 0 || ret
>= MAXPATHLEN
)
3116 static int do_lxcapi_snapshot(struct lxc_container
*c
, const char *commentfile
)
3119 struct lxc_container
*c2
;
3120 char snappath
[MAXPATHLEN
], newname
[20];
3122 if (!c
|| !lxcapi_is_defined(c
))
3125 if (!bdev_can_backup(c
->lxc_conf
)) {
3126 ERROR("%s's backing store cannot be backed up.", c
->name
);
3127 ERROR("Your container must use another backing store type.");
3131 if (!get_snappath_dir(c
, snappath
))
3134 i
= get_next_index(snappath
, c
->name
);
3136 if (mkdir_p(snappath
, 0755) < 0) {
3137 ERROR("Failed to create snapshot directory %s", snappath
);
3141 ret
= snprintf(newname
, 20, "snap%d", i
);
3142 if (ret
< 0 || ret
>= 20)
3146 * We pass LXC_CLONE_SNAPSHOT to make sure that a rdepends file entry is
3147 * created in the original container
3149 flags
= LXC_CLONE_SNAPSHOT
| LXC_CLONE_KEEPMACADDR
| LXC_CLONE_KEEPNAME
|
3150 LXC_CLONE_KEEPBDEVTYPE
| LXC_CLONE_MAYBE_SNAPSHOT
;
3151 if (bdev_is_dir(c
->lxc_conf
, c
->lxc_conf
->rootfs
.path
)) {
3152 ERROR("Snapshot of directory-backed container requested.");
3153 ERROR("Making a copy-clone. If you do want snapshots, then");
3154 ERROR("please create an aufs or overlayfs clone first, snapshot that");
3155 ERROR("and keep the original container pristine.");
3156 flags
&= ~LXC_CLONE_SNAPSHOT
| LXC_CLONE_MAYBE_SNAPSHOT
;
3158 c2
= do_lxcapi_clone(c
, newname
, snappath
, flags
, NULL
, NULL
, 0, NULL
);
3160 ERROR("clone of %s:%s failed", c
->config_path
, c
->name
);
3164 lxc_container_put(c2
);
3166 // Now write down the creation time
3173 tm_info
= localtime(&timer
);
3175 strftime(buffer
, 25, "%Y:%m:%d %H:%M:%S", tm_info
);
3177 char *dfnam
= alloca(strlen(snappath
) + strlen(newname
) + 5);
3178 sprintf(dfnam
, "%s/%s/ts", snappath
, newname
);
3179 f
= fopen(dfnam
, "w");
3181 ERROR("Failed to open %s", dfnam
);
3184 if (fprintf(f
, "%s", buffer
) < 0) {
3185 SYSERROR("Writing timestamp");
3191 SYSERROR("Writing timestamp");
3196 // $p / $name / comment \0
3197 int len
= strlen(snappath
) + strlen(newname
) + 10;
3198 char *path
= alloca(len
);
3199 sprintf(path
, "%s/%s/comment", snappath
, newname
);
3200 return copy_file(commentfile
, path
) < 0 ? -1 : i
;
3206 WRAP_API_1(int, lxcapi_snapshot
, const char *)
3208 static void lxcsnap_free(struct lxc_snapshot
*s
)
3211 free(s
->comment_pathname
);
3216 static char *get_snapcomment_path(char* snappath
, char *name
)
3218 // $snappath/$name/comment
3219 int ret
, len
= strlen(snappath
) + strlen(name
) + 10;
3220 char *s
= malloc(len
);
3223 ret
= snprintf(s
, len
, "%s/%s/comment", snappath
, name
);
3224 if (ret
< 0 || ret
>= len
) {
3232 static char *get_timestamp(char* snappath
, char *name
)
3234 char path
[MAXPATHLEN
], *s
= NULL
;
3238 ret
= snprintf(path
, MAXPATHLEN
, "%s/%s/ts", snappath
, name
);
3239 if (ret
< 0 || ret
>= MAXPATHLEN
)
3241 fin
= fopen(path
, "r");
3244 (void) fseek(fin
, 0, SEEK_END
);
3246 (void) fseek(fin
, 0, SEEK_SET
);
3251 if (fread(s
, 1, len
, fin
) != len
) {
3252 SYSERROR("reading timestamp");
3262 static int do_lxcapi_snapshot_list(struct lxc_container
*c
, struct lxc_snapshot
**ret_snaps
)
3264 char snappath
[MAXPATHLEN
], path2
[MAXPATHLEN
];
3266 struct dirent dirent
, *direntp
;
3267 struct lxc_snapshot
*snaps
=NULL
, *nsnaps
;
3270 if (!c
|| !lxcapi_is_defined(c
))
3273 if (!get_snappath_dir(c
, snappath
)) {
3274 ERROR("path name too long");
3277 dir
= opendir(snappath
);
3279 INFO("failed to open %s - assuming no snapshots", snappath
);
3283 while (!readdir_r(dir
, &dirent
, &direntp
)) {
3287 if (!strcmp(direntp
->d_name
, "."))
3290 if (!strcmp(direntp
->d_name
, ".."))
3293 ret
= snprintf(path2
, MAXPATHLEN
, "%s/%s/config", snappath
, direntp
->d_name
);
3294 if (ret
< 0 || ret
>= MAXPATHLEN
) {
3295 ERROR("pathname too long");
3298 if (!file_exists(path2
))
3300 nsnaps
= realloc(snaps
, (count
+ 1)*sizeof(*snaps
));
3302 SYSERROR("Out of memory");
3306 snaps
[count
].free
= lxcsnap_free
;
3307 snaps
[count
].name
= strdup(direntp
->d_name
);
3308 if (!snaps
[count
].name
)
3310 snaps
[count
].lxcpath
= strdup(snappath
);
3311 if (!snaps
[count
].lxcpath
) {
3312 free(snaps
[count
].name
);
3315 snaps
[count
].comment_pathname
= get_snapcomment_path(snappath
, direntp
->d_name
);
3316 snaps
[count
].timestamp
= get_timestamp(snappath
, direntp
->d_name
);
3321 WARN("failed to close directory");
3329 for (i
=0; i
<count
; i
++)
3330 lxcsnap_free(&snaps
[i
]);
3334 WARN("failed to close directory");
3338 WRAP_API_1(int, lxcapi_snapshot_list
, struct lxc_snapshot
**)
3340 static bool do_lxcapi_snapshot_restore(struct lxc_container
*c
, const char *snapname
, const char *newname
)
3342 char clonelxcpath
[MAXPATHLEN
];
3344 struct lxc_container
*snap
, *rest
;
3348 if (!c
|| !c
->name
|| !c
->config_path
)
3351 if (has_fs_snapshots(c
)) {
3352 ERROR("container rootfs has dependent snapshots");
3356 bdev
= bdev_init(c
->lxc_conf
, c
->lxc_conf
->rootfs
.path
, c
->lxc_conf
->rootfs
.mount
, NULL
);
3358 ERROR("Failed to find original backing store type");
3365 if (!get_snappath_dir(c
, clonelxcpath
)) {
3369 // how should we lock this?
3371 snap
= lxc_container_new(snapname
, clonelxcpath
);
3372 if (!snap
|| !lxcapi_is_defined(snap
)) {
3373 ERROR("Could not open snapshot %s", snapname
);
3374 if (snap
) lxc_container_put(snap
);
3379 if (strcmp(c
->name
, newname
) == 0) {
3380 if (!container_destroy(c
)) {
3381 ERROR("Could not destroy existing container %s", newname
);
3382 lxc_container_put(snap
);
3388 if (strcmp(bdev
->type
, "dir") != 0 && strcmp(bdev
->type
, "loop") != 0)
3389 flags
= LXC_CLONE_SNAPSHOT
| LXC_CLONE_MAYBE_SNAPSHOT
;
3390 rest
= lxcapi_clone(snap
, newname
, c
->config_path
, flags
,
3391 bdev
->type
, NULL
, 0, NULL
);
3393 if (rest
&& lxcapi_is_defined(rest
))
3396 lxc_container_put(rest
);
3397 lxc_container_put(snap
);
3401 WRAP_API_2(bool, lxcapi_snapshot_restore
, const char *, const char *)
3403 static bool do_snapshot_destroy(const char *snapname
, const char *clonelxcpath
)
3405 struct lxc_container
*snap
= NULL
;
3408 snap
= lxc_container_new(snapname
, clonelxcpath
);
3410 ERROR("Could not find snapshot %s", snapname
);
3414 if (!do_lxcapi_destroy(snap
)) {
3415 ERROR("Could not destroy snapshot %s", snapname
);
3422 lxc_container_put(snap
);
3426 static bool remove_all_snapshots(const char *path
)
3429 struct dirent dirent
, *direntp
;
3432 dir
= opendir(path
);
3434 SYSERROR("opendir on snapshot path %s", path
);
3437 while (!readdir_r(dir
, &dirent
, &direntp
)) {
3440 if (!strcmp(direntp
->d_name
, "."))
3442 if (!strcmp(direntp
->d_name
, ".."))
3444 if (!do_snapshot_destroy(direntp
->d_name
, path
)) {
3453 SYSERROR("Error removing directory %s", path
);
3458 static bool do_lxcapi_snapshot_destroy(struct lxc_container
*c
, const char *snapname
)
3460 char clonelxcpath
[MAXPATHLEN
];
3462 if (!c
|| !c
->name
|| !c
->config_path
|| !snapname
)
3465 if (!get_snappath_dir(c
, clonelxcpath
))
3468 return do_snapshot_destroy(snapname
, clonelxcpath
);
3471 WRAP_API_1(bool, lxcapi_snapshot_destroy
, const char *)
3473 static bool do_lxcapi_snapshot_destroy_all(struct lxc_container
*c
)
3475 char clonelxcpath
[MAXPATHLEN
];
3477 if (!c
|| !c
->name
|| !c
->config_path
)
3480 if (!get_snappath_dir(c
, clonelxcpath
))
3483 return remove_all_snapshots(clonelxcpath
);
3486 WRAP_API(bool, lxcapi_snapshot_destroy_all
)
3488 static bool do_lxcapi_may_control(struct lxc_container
*c
)
3490 return lxc_try_cmd(c
->name
, c
->config_path
) == 0;
3493 WRAP_API(bool, lxcapi_may_control
)
3495 static bool do_add_remove_node(pid_t init_pid
, const char *path
, bool add
,
3498 char chrootpath
[MAXPATHLEN
];
3499 char *directory_path
= NULL
;
3503 if ((pid
= fork()) < 0) {
3504 SYSERROR("failed to fork a child helper");
3508 if (wait_for_pid(pid
) != 0) {
3509 ERROR("Failed to create note in guest");
3515 /* prepare the path */
3516 ret
= snprintf(chrootpath
, MAXPATHLEN
, "/proc/%d/root", init_pid
);
3517 if (ret
< 0 || ret
>= MAXPATHLEN
)
3520 if (chroot(chrootpath
) < 0)
3524 /* remove path if it exists */
3525 if(faccessat(AT_FDCWD
, path
, F_OK
, AT_SYMLINK_NOFOLLOW
) == 0) {
3526 if (unlink(path
) < 0) {
3527 ERROR("unlink failed");
3534 /* create any missing directories */
3535 directory_path
= dirname(strdup(path
));
3536 if (mkdir_p(directory_path
, 0755) < 0 && errno
!= EEXIST
) {
3537 ERROR("failed to create directory");
3541 /* create the device node */
3542 if (mknod(path
, st
->st_mode
, st
->st_rdev
) < 0) {
3543 ERROR("mknod failed");
3550 static bool add_remove_device_node(struct lxc_container
*c
, const char *src_path
, const char *dest_path
, bool add
)
3554 char value
[MAX_BUFFER
];
3557 /* make sure container is running */
3558 if (!do_lxcapi_is_running(c
)) {
3559 ERROR("container is not running");
3563 /* use src_path if dest_path is NULL otherwise use dest_path */
3564 p
= dest_path
? dest_path
: src_path
;
3566 /* make sure we can access p */
3567 if(access(p
, F_OK
) < 0 || stat(p
, &st
) < 0)
3570 /* continue if path is character device or block device */
3571 if (S_ISCHR(st
.st_mode
))
3572 ret
= snprintf(value
, MAX_BUFFER
, "c %d:%d rwm", major(st
.st_rdev
), minor(st
.st_rdev
));
3573 else if (S_ISBLK(st
.st_mode
))
3574 ret
= snprintf(value
, MAX_BUFFER
, "b %d:%d rwm", major(st
.st_rdev
), minor(st
.st_rdev
));
3578 /* check snprintf return code */
3579 if (ret
< 0 || ret
>= MAX_BUFFER
)
3582 if (!do_add_remove_node(do_lxcapi_init_pid(c
), p
, add
, &st
))
3585 /* add or remove device to/from cgroup access list */
3587 if (!do_lxcapi_set_cgroup_item(c
, "devices.allow", value
)) {
3588 ERROR("set_cgroup_item failed while adding the device node");
3592 if (!do_lxcapi_set_cgroup_item(c
, "devices.deny", value
)) {
3593 ERROR("set_cgroup_item failed while removing the device node");
3601 static bool do_lxcapi_add_device_node(struct lxc_container
*c
, const char *src_path
, const char *dest_path
)
3604 ERROR(NOT_SUPPORTED_ERROR
, __FUNCTION__
);
3607 return add_remove_device_node(c
, src_path
, dest_path
, true);
3610 WRAP_API_2(bool, lxcapi_add_device_node
, const char *, const char *)
3612 static bool do_lxcapi_remove_device_node(struct lxc_container
*c
, const char *src_path
, const char *dest_path
)
3615 ERROR(NOT_SUPPORTED_ERROR
, __FUNCTION__
);
3618 return add_remove_device_node(c
, src_path
, dest_path
, false);
3621 WRAP_API_2(bool, lxcapi_remove_device_node
, const char *, const char *)
3623 static bool do_lxcapi_attach_interface(struct lxc_container
*c
, const char *ifname
,
3624 const char *dst_ifname
)
3628 ERROR(NOT_SUPPORTED_ERROR
, __FUNCTION__
);
3633 ERROR("No source interface name given");
3637 ret
= lxc_netdev_isup(ifname
);
3640 /* netdev of ifname is up. */
3641 ret
= lxc_netdev_down(ifname
);
3646 ret
= lxc_netdev_move_by_name(ifname
, do_lxcapi_init_pid(c
), dst_ifname
);
3656 WRAP_API_2(bool, lxcapi_attach_interface
, const char *, const char *)
3658 static bool do_lxcapi_detach_interface(struct lxc_container
*c
, const char *ifname
,
3659 const char *dst_ifname
)
3661 pid_t pid
, pid_outside
;
3664 ERROR(NOT_SUPPORTED_ERROR
, __FUNCTION__
);
3669 ERROR("No source interface name given");
3673 pid_outside
= getpid();
3676 ERROR("failed to fork task to get interfaces information");
3680 if (pid
== 0) { // child
3682 if (!enter_net_ns(c
)) {
3683 ERROR("failed to enter namespace");
3687 ret
= lxc_netdev_isup(ifname
);
3691 /* netdev of ifname is up. */
3693 ret
= lxc_netdev_down(ifname
);
3698 ret
= lxc_netdev_move_by_name(ifname
, pid_outside
, dst_ifname
);
3700 /* -EINVAL means there is no netdev named as ifanme. */
3701 if (ret
== -EINVAL
) {
3702 ERROR("No network device named as %s.", ifname
);
3707 if (wait_for_pid(pid
) != 0)
3713 WRAP_API_2(bool, lxcapi_detach_interface
, const char *, const char *)
3715 static bool do_lxcapi_checkpoint(struct lxc_container
*c
, char *directory
, bool stop
, bool verbose
)
3719 char path
[PATH_MAX
];
3724 if (mkdir(directory
, 0700) < 0 && errno
!= EEXIST
)
3727 status
= snprintf(path
, sizeof(path
), "%s/inventory.img", directory
);
3728 if (status
< 0 || status
>= sizeof(path
))
3731 if (access(path
, F_OK
) == 0) {
3732 ERROR("please use a fresh directory for the dump directory\n");
3736 if (!dump_net_info(c
, directory
))
3744 struct criu_opts os
;
3747 os
.directory
= directory
;
3750 os
.verbose
= verbose
;
3752 /* exec_criu() returning is an error */
3756 pid_t w
= waitpid(pid
, &status
, 0);
3758 SYSERROR("waitpid");
3762 if (WIFEXITED(status
)) {
3763 return !WEXITSTATUS(status
);
3770 WRAP_API_3(bool, lxcapi_checkpoint
, char *, bool, bool)
3772 static bool do_lxcapi_restore(struct lxc_container
*c
, char *directory
, bool verbose
)
3782 ERROR("Must be root to restore\n");
3787 ERROR("failed to create pipe");
3800 // this never returns
3801 do_restore(c
, pipefd
[1], directory
, verbose
);
3806 nread
= read(pipefd
[0], &status
, sizeof(status
));
3808 if (sizeof(status
) != nread
) {
3809 ERROR("reading status from pipe failed");
3813 // If the criu process was killed or exited nonzero, wait() for the
3814 // handler, since the restore process died. Otherwise, we don't need to
3815 // wait, since the child becomes the monitor process.
3816 if (!WIFEXITED(status
) || WEXITSTATUS(status
))
3821 if (wait_for_pid(pid
))
3822 ERROR("restore process died");
3826 WRAP_API_2(bool, lxcapi_restore
, char *, bool)
3828 static int lxcapi_attach_run_waitl(struct lxc_container
*c
, lxc_attach_options_t
*options
, const char *program
, const char *arg
, ...)
3837 current_config
= c
->lxc_conf
;
3840 argv
= lxc_va_arg_list_to_argv_const(ap
, 1);
3844 ERROR("Memory allocation error.");
3850 ret
= do_lxcapi_attach_run_wait(c
, options
, program
, (const char * const *)argv
);
3853 current_config
= NULL
;
3857 struct lxc_container
*lxc_container_new(const char *name
, const char *configpath
)
3859 struct lxc_container
*c
;
3864 c
= malloc(sizeof(*c
));
3866 fprintf(stderr
, "failed to malloc lxc_container\n");
3869 memset(c
, 0, sizeof(*c
));
3872 c
->config_path
= strdup(configpath
);
3874 c
->config_path
= strdup(lxc_global_config_value("lxc.lxcpath"));
3876 if (!c
->config_path
) {
3877 fprintf(stderr
, "Out of memory\n");
3881 remove_trailing_slashes(c
->config_path
);
3882 c
->name
= malloc(strlen(name
)+1);
3884 fprintf(stderr
, "Error allocating lxc_container name\n");
3887 strcpy(c
->name
, name
);
3890 if (!(c
->slock
= lxc_newlock(c
->config_path
, name
))) {
3891 fprintf(stderr
, "failed to create lock\n");
3895 if (!(c
->privlock
= lxc_newlock(NULL
, NULL
))) {
3896 fprintf(stderr
, "failed to alloc privlock\n");
3900 if (!set_config_filename(c
)) {
3901 fprintf(stderr
, "Error allocating config file pathname\n");
3905 if (file_exists(c
->configfile
) && !lxcapi_load_config(c
, NULL
))
3908 if (ongoing_create(c
) == 2) {
3909 ERROR("Error: %s creation was not completed", c
->name
);
3910 container_destroy(c
);
3911 lxcapi_clear_config(c
);
3913 c
->daemonize
= true;
3916 // assign the member functions
3917 c
->is_defined
= lxcapi_is_defined
;
3918 c
->state
= lxcapi_state
;
3919 c
->is_running
= lxcapi_is_running
;
3920 c
->freeze
= lxcapi_freeze
;
3921 c
->unfreeze
= lxcapi_unfreeze
;
3922 c
->console
= lxcapi_console
;
3923 c
->console_getfd
= lxcapi_console_getfd
;
3924 c
->init_pid
= lxcapi_init_pid
;
3925 c
->load_config
= lxcapi_load_config
;
3926 c
->want_daemonize
= lxcapi_want_daemonize
;
3927 c
->want_close_all_fds
= lxcapi_want_close_all_fds
;
3928 c
->start
= lxcapi_start
;
3929 c
->startl
= lxcapi_startl
;
3930 c
->stop
= lxcapi_stop
;
3931 c
->config_file_name
= lxcapi_config_file_name
;
3932 c
->wait
= lxcapi_wait
;
3933 c
->set_config_item
= lxcapi_set_config_item
;
3934 c
->destroy
= lxcapi_destroy
;
3935 c
->destroy_with_snapshots
= lxcapi_destroy_with_snapshots
;
3936 c
->rename
= lxcapi_rename
;
3937 c
->save_config
= lxcapi_save_config
;
3938 c
->get_keys
= lxcapi_get_keys
;
3939 c
->create
= lxcapi_create
;
3940 c
->createl
= lxcapi_createl
;
3941 c
->shutdown
= lxcapi_shutdown
;
3942 c
->reboot
= lxcapi_reboot
;
3943 c
->clear_config
= lxcapi_clear_config
;
3944 c
->clear_config_item
= lxcapi_clear_config_item
;
3945 c
->get_config_item
= lxcapi_get_config_item
;
3946 c
->get_running_config_item
= lxcapi_get_running_config_item
;
3947 c
->get_cgroup_item
= lxcapi_get_cgroup_item
;
3948 c
->set_cgroup_item
= lxcapi_set_cgroup_item
;
3949 c
->get_config_path
= lxcapi_get_config_path
;
3950 c
->set_config_path
= lxcapi_set_config_path
;
3951 c
->clone
= lxcapi_clone
;
3952 c
->get_interfaces
= lxcapi_get_interfaces
;
3953 c
->get_ips
= lxcapi_get_ips
;
3954 c
->attach
= lxcapi_attach
;
3955 c
->attach_run_wait
= lxcapi_attach_run_wait
;
3956 c
->attach_run_waitl
= lxcapi_attach_run_waitl
;
3957 c
->snapshot
= lxcapi_snapshot
;
3958 c
->snapshot_list
= lxcapi_snapshot_list
;
3959 c
->snapshot_restore
= lxcapi_snapshot_restore
;
3960 c
->snapshot_destroy
= lxcapi_snapshot_destroy
;
3961 c
->snapshot_destroy_all
= lxcapi_snapshot_destroy_all
;
3962 c
->may_control
= lxcapi_may_control
;
3963 c
->add_device_node
= lxcapi_add_device_node
;
3964 c
->remove_device_node
= lxcapi_remove_device_node
;
3965 c
->attach_interface
= lxcapi_attach_interface
;
3966 c
->detach_interface
= lxcapi_detach_interface
;
3967 c
->checkpoint
= lxcapi_checkpoint
;
3968 c
->restore
= lxcapi_restore
;
3973 lxc_container_free(c
);
3977 int lxc_get_wait_states(const char **states
)
3982 for (i
=0; i
<MAX_STATE
; i
++)
3983 states
[i
] = lxc_state2str(i
);
3988 * These next two could probably be done smarter with reusing a common function
3989 * with different iterators and tests...
3991 int list_defined_containers(const char *lxcpath
, char ***names
, struct lxc_container
***cret
)
3994 int i
, cfound
= 0, nfound
= 0;
3995 struct dirent dirent
, *direntp
;
3996 struct lxc_container
*c
;
3999 lxcpath
= lxc_global_config_value("lxc.lxcpath");
4001 dir
= opendir(lxcpath
);
4003 SYSERROR("opendir on lxcpath");
4012 while (!readdir_r(dir
, &dirent
, &direntp
)) {
4015 if (!strcmp(direntp
->d_name
, "."))
4017 if (!strcmp(direntp
->d_name
, ".."))
4020 if (!config_file_exists(lxcpath
, direntp
->d_name
))
4024 if (!add_to_array(names
, direntp
->d_name
, cfound
))
4034 c
= lxc_container_new(direntp
->d_name
, lxcpath
);
4036 INFO("Container %s:%s has a config but could not be loaded",
4037 lxcpath
, direntp
->d_name
);
4039 if(!remove_from_array(names
, direntp
->d_name
, cfound
--))
4043 if (!do_lxcapi_is_defined(c
)) {
4044 INFO("Container %s:%s has a config but is not defined",
4045 lxcpath
, direntp
->d_name
);
4047 if(!remove_from_array(names
, direntp
->d_name
, cfound
--))
4049 lxc_container_put(c
);
4053 if (!add_to_clist(cret
, c
, nfound
, true)) {
4054 lxc_container_put(c
);
4064 if (names
&& *names
) {
4065 for (i
=0; i
<cfound
; i
++)
4069 if (cret
&& *cret
) {
4070 for (i
=0; i
<nfound
; i
++)
4071 lxc_container_put((*cret
)[i
]);
4078 int list_active_containers(const char *lxcpath
, char ***nret
,
4079 struct lxc_container
***cret
)
4081 int i
, ret
= -1, cret_cnt
= 0, ct_name_cnt
= 0;
4084 char **ct_name
= NULL
;
4086 struct lxc_container
*c
;
4090 lxcpath
= lxc_global_config_value("lxc.lxcpath");
4091 lxcpath_len
= strlen(lxcpath
);
4098 FILE *f
= fopen("/proc/net/unix", "r");
4102 while (getline(&line
, &len
, f
) != -1) {
4104 char *p
= strrchr(line
, ' '), *p2
;
4113 if (strncmp(p
, lxcpath
, lxcpath_len
) == 0) {
4115 } else if (strncmp(p
, "lxc/", 4) == 0) {
4125 // Now p is the start of lxc_name
4126 p2
= strchr(p
, '/');
4127 if (!p2
|| strncmp(p2
, "/command", 8) != 0)
4132 if (strncmp(lxcpath
, lxc_cmd_get_lxcpath(p
), lxcpath_len
) != 0)
4134 p
= lxc_cmd_get_name(p
);
4137 if (array_contains(&ct_name
, p
, ct_name_cnt
))
4140 if (!add_to_array(&ct_name
, p
, ct_name_cnt
))
4141 goto free_cret_list
;
4148 c
= lxc_container_new(p
, lxcpath
);
4150 INFO("Container %s:%s is running but could not be loaded",
4152 remove_from_array(&ct_name
, p
, ct_name_cnt
--);
4157 * If this is an anonymous container, then is_defined *can*
4158 * return false. So we don't do that check. Count on the
4159 * fact that the command socket exists.
4162 if (!add_to_clist(cret
, c
, cret_cnt
, true)) {
4163 lxc_container_put(c
);
4164 goto free_cret_list
;
4169 assert(!nret
|| !cret
|| cret_cnt
== ct_name_cnt
);
4178 if (cret
&& *cret
) {
4179 for (i
= 0; i
< cret_cnt
; i
++)
4180 lxc_container_put((*cret
)[i
]);
4186 for (i
= 0; i
< ct_name_cnt
; i
++)
4198 int list_all_containers(const char *lxcpath
, char ***nret
,
4199 struct lxc_container
***cret
)
4201 int i
, ret
, active_cnt
, ct_cnt
, ct_list_cnt
;
4204 struct lxc_container
**ct_list
= NULL
;
4206 ct_cnt
= list_defined_containers(lxcpath
, &ct_name
, NULL
);
4210 active_cnt
= list_active_containers(lxcpath
, &active_name
, NULL
);
4211 if (active_cnt
< 0) {
4216 for (i
= 0; i
< active_cnt
; i
++) {
4217 if (!array_contains(&ct_name
, active_name
[i
], ct_cnt
)) {
4218 if (!add_to_array(&ct_name
, active_name
[i
], ct_cnt
)) {
4220 goto free_active_name
;
4224 free(active_name
[i
]);
4225 active_name
[i
] = NULL
;
4231 for (i
= 0, ct_list_cnt
= 0; i
< ct_cnt
&& cret
; i
++) {
4232 struct lxc_container
*c
;
4234 c
= lxc_container_new(ct_name
[i
], lxcpath
);
4236 WARN("Container %s:%s could not be loaded", lxcpath
, ct_name
[i
]);
4237 remove_from_array(&ct_name
, ct_name
[i
], ct_cnt
--);
4241 if (!add_to_clist(&ct_list
, c
, ct_list_cnt
, false)) {
4242 lxc_container_put(c
);
4261 for (i
= 0; i
< ct_list_cnt
; i
++) {
4262 lxc_container_put(ct_list
[i
]);
4267 for (i
= 0; i
< active_cnt
; i
++) {
4268 free(active_name
[i
]);
4273 for (i
= 0; i
< ct_cnt
; i
++) {