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);
727 if (!am_single_threaded()) {
728 ERROR("Cannot start non-daemonized container when threaded");
733 /* We need to write PID file after daeminize, so we always
734 * write the right PID.
737 pid_fp
= fopen(c
->pidfile
, "w");
738 if (pid_fp
== NULL
) {
739 SYSERROR("Failed to create pidfile '%s' for '%s'",
740 c
->pidfile
, c
->name
);
744 if (fprintf(pid_fp
, "%d\n", getpid()) < 0) {
745 SYSERROR("Failed to write '%s'", c
->pidfile
);
758 if (lxc_check_inherited(conf
, daemonize
, -1)) {
759 ERROR("Inherited fds found");
764 ret
= lxc_start(c
->name
, argv
, conf
, c
->config_path
, daemonize
);
768 INFO("container requested reboot");
781 exit (ret
== 0 ? true : false);
783 return (ret
== 0 ? true : false);
786 static bool lxcapi_start(struct lxc_container
*c
, int useinit
, char * const argv
[])
789 current_config
= c
? c
->lxc_conf
: NULL
;
790 ret
= do_lxcapi_start(c
, useinit
, argv
);
791 current_config
= NULL
;
796 * note there MUST be an ending NULL
798 static bool lxcapi_startl(struct lxc_container
*c
, int useinit
, ...)
801 char **inargs
= NULL
;
804 /* container exists */
808 current_config
= c
->lxc_conf
;
810 va_start(ap
, useinit
);
811 inargs
= lxc_va_arg_list_to_argv(ap
, 0, 1);
815 ERROR("Memory allocation error.");
819 /* pass NULL if no arguments were supplied */
820 bret
= do_lxcapi_start(c
, useinit
, *inargs
? inargs
: NULL
);
825 for (arg
= inargs
; *arg
; arg
++)
830 current_config
= NULL
;
834 static bool do_lxcapi_stop(struct lxc_container
*c
)
841 ret
= lxc_cmd_stop(c
->name
, c
->config_path
);
846 WRAP_API(bool, lxcapi_stop
)
848 static int do_create_container_dir(const char *path
, struct lxc_conf
*conf
)
850 int ret
= -1, lasterr
;
851 char *p
= alloca(strlen(path
)+1);
852 mode_t mask
= umask(0002);
853 ret
= mkdir(path
, 0770);
861 SYSERROR("failed to create container path %s", path
);
866 if (!lxc_list_empty(&conf
->id_map
) && chown_mapped_root(p
, conf
) != 0) {
867 ERROR("Failed to chown container dir");
874 * create the standard expected container dir
876 static bool create_container_dir(struct lxc_container
*c
)
881 len
= strlen(c
->config_path
) + strlen(c
->name
) + 2;
885 ret
= snprintf(s
, len
, "%s/%s", c
->config_path
, c
->name
);
886 if (ret
< 0 || ret
>= len
) {
890 ret
= do_create_container_dir(s
, c
->lxc_conf
);
896 * do_bdev_create: thin wrapper around bdev_create(). Like bdev_create(),
897 * it returns a mounted bdev on success, NULL on error.
899 static struct bdev
*do_bdev_create(struct lxc_container
*c
, const char *type
,
900 struct bdev_specs
*specs
)
907 /* rootfs.path or lxcpath/lxcname/rootfs */
908 if (c
->lxc_conf
->rootfs
.path
&& access(c
->lxc_conf
->rootfs
.path
, F_OK
) == 0) {
909 const char *rpath
= c
->lxc_conf
->rootfs
.path
;
910 len
= strlen(rpath
) + 1;
912 ret
= snprintf(dest
, len
, "%s", rpath
);
914 const char *lxcpath
= do_lxcapi_get_config_path(c
);
915 len
= strlen(c
->name
) + strlen(lxcpath
) + 9;
917 ret
= snprintf(dest
, len
, "%s/%s/rootfs", lxcpath
, c
->name
);
919 if (ret
< 0 || ret
>= len
)
922 bdev
= bdev_create(dest
, type
, c
->name
, specs
);
924 ERROR("Failed to create backing store type %s", type
);
928 do_lxcapi_set_config_item(c
, "lxc.rootfs", bdev
->src
);
930 /* if we are not root, chown the rootfs dir to root in the
933 if (geteuid() != 0 || (c
->lxc_conf
&& !lxc_list_empty(&c
->lxc_conf
->id_map
))) {
934 if (chown_mapped_root(bdev
->dest
, c
->lxc_conf
) < 0) {
935 ERROR("Error chowning %s to container root", bdev
->dest
);
936 suggest_default_idmap();
945 static char *lxcbasename(char *path
)
947 char *p
= path
+ strlen(path
) - 1;
948 while (*p
!= '/' && p
> path
)
953 static bool create_run_template(struct lxc_container
*c
, char *tpath
, bool quiet
,
963 SYSERROR("failed to fork task for container creation template");
967 if (pid
== 0) { // child
968 char *patharg
, *namearg
, *rootfsarg
, *src
;
969 struct bdev
*bdev
= NULL
;
971 int ret
, len
, nargs
= 0;
973 struct lxc_conf
*conf
= c
->lxc_conf
;
979 open("/dev/zero", O_RDONLY
);
980 open("/dev/null", O_RDWR
);
981 open("/dev/null", O_RDWR
);
984 src
= c
->lxc_conf
->rootfs
.path
;
986 * for an overlay create, what the user wants is the template to fill
987 * in what will become the readonly lower layer. So don't mount for
990 if (strncmp(src
, "overlayfs:", 10) == 0)
991 src
= overlay_getlower(src
+10);
992 if (strncmp(src
, "aufs:", 5) == 0)
993 src
= overlay_getlower(src
+5);
995 bdev
= bdev_init(c
->lxc_conf
, src
, c
->lxc_conf
->rootfs
.mount
, NULL
);
997 ERROR("Error opening rootfs");
1001 if (geteuid() == 0) {
1002 if (unshare(CLONE_NEWNS
) < 0) {
1003 ERROR("error unsharing mounts");
1006 if (detect_shared_rootfs()) {
1007 if (mount(NULL
, "/", NULL
, MS_SLAVE
|MS_REC
, NULL
)) {
1008 SYSERROR("Failed to make / rslave to run template");
1009 ERROR("Continuing...");
1013 if (strcmp(bdev
->type
, "dir") && strcmp(bdev
->type
, "btrfs")) {
1014 if (geteuid() != 0) {
1015 ERROR("non-root users can only create btrfs and directory-backed containers");
1018 if (bdev
->ops
->mount(bdev
) < 0) {
1019 ERROR("Error mounting rootfs");
1022 } else { // TODO come up with a better way here!
1024 bdev
->dest
= strdup(bdev
->src
);
1028 * create our new array, pre-pend the template name and
1032 for (nargs
= 0; argv
[nargs
]; nargs
++) ;
1033 nargs
+= 4; // template, path, rootfs and name args
1035 newargv
= malloc(nargs
* sizeof(*newargv
));
1038 newargv
[0] = lxcbasename(tpath
);
1040 len
= strlen(c
->config_path
) + strlen(c
->name
) + strlen("--path=") + 2;
1041 patharg
= malloc(len
);
1044 ret
= snprintf(patharg
, len
, "--path=%s/%s", c
->config_path
, c
->name
);
1045 if (ret
< 0 || ret
>= len
)
1047 newargv
[1] = patharg
;
1048 len
= strlen("--name=") + strlen(c
->name
) + 1;
1049 namearg
= malloc(len
);
1052 ret
= snprintf(namearg
, len
, "--name=%s", c
->name
);
1053 if (ret
< 0 || ret
>= len
)
1055 newargv
[2] = namearg
;
1057 len
= strlen("--rootfs=") + 1 + strlen(bdev
->dest
);
1058 rootfsarg
= malloc(len
);
1061 ret
= snprintf(rootfsarg
, len
, "--rootfs=%s", bdev
->dest
);
1062 if (ret
< 0 || ret
>= len
)
1064 newargv
[3] = rootfsarg
;
1066 /* add passed-in args */
1068 for (i
= 4; i
< nargs
; i
++)
1069 newargv
[i
] = argv
[i
-4];
1071 /* add trailing NULL */
1073 newargv
= realloc(newargv
, nargs
* sizeof(*newargv
));
1076 newargv
[nargs
- 1] = NULL
;
1079 * If we're running the template in a mapped userns, then
1080 * we prepend the template command with:
1081 * lxc-usernsexec <-m map1> ... <-m mapn> --
1082 * and we append "--mapped-uid x", where x is the mapped uid
1085 if (!lxc_list_empty(&conf
->id_map
)) {
1089 char **n2
= malloc(n2args
* sizeof(*n2
));
1090 struct lxc_list
*it
;
1094 SYSERROR("out of memory");
1098 tpath
= "lxc-usernsexec";
1099 n2
[0] = "lxc-usernsexec";
1100 lxc_list_for_each(it
, &conf
->id_map
) {
1103 n2
= realloc(n2
, n2args
* sizeof(char *));
1106 n2
[n2args
-2] = "-m";
1107 n2
[n2args
-1] = malloc(200);
1110 ret
= snprintf(n2
[n2args
-1], 200, "%c:%lu:%lu:%lu",
1111 map
->idtype
== ID_TYPE_UID
? 'u' : 'g',
1112 map
->nsid
, map
->hostid
, map
->range
);
1113 if (ret
< 0 || ret
>= 200)
1116 int hostid_mapped
= mapped_hostid(geteuid(), conf
, ID_TYPE_UID
);
1117 int extraargs
= hostid_mapped
>= 0 ? 1 : 3;
1118 n2
= realloc(n2
, (nargs
+ n2args
+ extraargs
) * sizeof(char *));
1121 if (hostid_mapped
< 0) {
1122 hostid_mapped
= find_unmapped_nsuid(conf
, ID_TYPE_UID
);
1123 n2
[n2args
++] = "-m";
1124 if (hostid_mapped
< 0) {
1125 ERROR("Could not find free uid to map");
1128 n2
[n2args
++] = malloc(200);
1129 if (!n2
[n2args
-1]) {
1130 SYSERROR("out of memory");
1133 ret
= snprintf(n2
[n2args
-1], 200, "u:%d:%d:1",
1134 hostid_mapped
, geteuid());
1135 if (ret
< 0 || ret
>= 200) {
1136 ERROR("string too long");
1140 int hostgid_mapped
= mapped_hostid(getegid(), conf
, ID_TYPE_GID
);
1141 extraargs
= hostgid_mapped
>= 0 ? 1 : 3;
1142 n2
= realloc(n2
, (nargs
+ n2args
+ extraargs
) * sizeof(char *));
1145 if (hostgid_mapped
< 0) {
1146 hostgid_mapped
= find_unmapped_nsuid(conf
, ID_TYPE_GID
);
1147 n2
[n2args
++] = "-m";
1148 if (hostgid_mapped
< 0) {
1149 ERROR("Could not find free uid to map");
1152 n2
[n2args
++] = malloc(200);
1153 if (!n2
[n2args
-1]) {
1154 SYSERROR("out of memory");
1157 ret
= snprintf(n2
[n2args
-1], 200, "g:%d:%d:1",
1158 hostgid_mapped
, getegid());
1159 if (ret
< 0 || ret
>= 200) {
1160 ERROR("string too long");
1164 n2
[n2args
++] = "--";
1165 for (i
= 0; i
< nargs
; i
++)
1166 n2
[i
+ n2args
] = newargv
[i
];
1168 // Finally add "--mapped-uid $uid" to tell template what to chown
1171 n2
= realloc(n2
, n2args
* sizeof(char *));
1173 SYSERROR("out of memory");
1176 // note n2[n2args-1] is NULL
1177 n2
[n2args
-5] = "--mapped-uid";
1178 snprintf(txtuid
, 20, "%d", hostid_mapped
);
1179 n2
[n2args
-4] = txtuid
;
1180 n2
[n2args
-3] = "--mapped-gid";
1181 snprintf(txtgid
, 20, "%d", hostgid_mapped
);
1182 n2
[n2args
-2] = txtgid
;
1183 n2
[n2args
-1] = NULL
;
1188 execvp(tpath
, newargv
);
1189 SYSERROR("failed to execute template %s", tpath
);
1193 if (wait_for_pid(pid
) != 0) {
1194 ERROR("container creation template for %s failed", c
->name
);
1201 static bool prepend_lxc_header(char *path
, const char *t
, char *const argv
[])
1209 unsigned char md_value
[SHA_DIGEST_LENGTH
];
1213 f
= fopen(path
, "r");
1217 if (fseek(f
, 0, SEEK_END
) < 0)
1219 if ((flen
= ftell(f
)) < 0)
1221 if (fseek(f
, 0, SEEK_SET
) < 0)
1223 if ((contents
= malloc(flen
+ 1)) == NULL
)
1225 if (fread(contents
, 1, flen
, f
) != flen
)
1226 goto out_free_contents
;
1228 contents
[flen
] = '\0';
1232 goto out_free_contents
;
1235 tpath
= get_template_path(t
);
1237 ERROR("bad template: %s", t
);
1238 goto out_free_contents
;
1241 ret
= sha1sum_file(tpath
, md_value
);
1243 ERROR("Error getting sha1sum of %s", tpath
);
1245 goto out_free_contents
;
1250 f
= fopen(path
, "w");
1252 SYSERROR("reopening config for writing");
1256 fprintf(f
, "# Template used to create this container: %s\n", t
);
1258 fprintf(f
, "# Parameters passed to the template:");
1260 fprintf(f
, " %s", *argv
);
1266 fprintf(f
, "# Template script checksum (SHA-1): ");
1267 for (i
=0; i
<SHA_DIGEST_LENGTH
; i
++)
1268 fprintf(f
, "%02x", md_value
[i
]);
1271 fprintf(f
, "# For additional config options, please look at lxc.container.conf(5)\n");
1272 if (fwrite(contents
, 1, flen
, f
) != flen
) {
1273 SYSERROR("Writing original contents");
1289 SYSERROR("Error prepending header");
1295 static void lxcapi_clear_config(struct lxc_container
*c
)
1299 lxc_conf_free(c
->lxc_conf
);
1305 #define do_lxcapi_clear_config(c) lxcapi_clear_config(c)
1309 * create a container with the given parameters.
1310 * @c: container to be created. It has the lxcpath, name, and a starting
1311 * configuration already set
1312 * @t: the template to execute to instantiate the root filesystem and
1313 * adjust the configuration.
1314 * @bdevtype: backing store type to use. If NULL, dir will be used.
1315 * @specs: additional parameters for the backing store, i.e. LVM vg to
1318 * @argv: the arguments to pass to the template, terminated by NULL. If no
1319 * arguments, you can just pass NULL.
1321 static bool do_lxcapi_create(struct lxc_container
*c
, const char *t
,
1322 const char *bdevtype
, struct bdev_specs
*specs
, int flags
,
1334 tpath
= get_template_path(t
);
1336 ERROR("bad template: %s", t
);
1342 * If a template is passed in, and the rootfs already is defined in
1343 * the container config and exists, then * caller is trying to create
1344 * an existing container. Return an error, but do NOT delete the
1347 if (do_lxcapi_is_defined(c
) && c
->lxc_conf
&& c
->lxc_conf
->rootfs
.path
&&
1348 access(c
->lxc_conf
->rootfs
.path
, F_OK
) == 0 && tpath
) {
1349 ERROR("Container %s:%s already exists", c
->config_path
, c
->name
);
1354 if (!do_lxcapi_load_config(c
, lxc_global_config_value("lxc.default_config"))) {
1355 ERROR("Error loading default configuration file %s", lxc_global_config_value("lxc.default_config"));
1360 if (!create_container_dir(c
))
1364 * either template or rootfs.path should be set.
1365 * if both template and rootfs.path are set, template is setup as rootfs.path.
1366 * container is already created if we have a config and rootfs.path is accessible
1368 if (!c
->lxc_conf
->rootfs
.path
&& !tpath
)
1369 /* no template passed in and rootfs does not exist: error */
1371 if (c
->lxc_conf
->rootfs
.path
&& access(c
->lxc_conf
->rootfs
.path
, F_OK
) != 0)
1372 /* rootfs passed into configuration, but does not exist: error */
1374 if (do_lxcapi_is_defined(c
) && c
->lxc_conf
->rootfs
.path
&& !tpath
) {
1375 /* Rootfs already existed, user just wanted to save the
1376 * loaded configuration */
1381 /* Mark that this container is being created */
1382 if ((partial_fd
= create_partial(c
)) < 0)
1385 /* no need to get disk lock bc we have the partial locked */
1388 * Create the backing store
1389 * Note we can't do this in the same task as we use to execute the
1390 * template because of the way zfs works.
1391 * After you 'zfs create', zfs mounts the fs only in the initial
1396 SYSERROR("failed to fork task for container creation template");
1400 if (pid
== 0) { // child
1401 struct bdev
*bdev
= NULL
;
1403 if (!(bdev
= do_bdev_create(c
, bdevtype
, specs
))) {
1404 ERROR("Error creating backing store type %s for %s",
1405 bdevtype
? bdevtype
: "(none)", c
->name
);
1409 /* save config file again to store the new rootfs location */
1410 if (!do_lxcapi_save_config(c
, NULL
)) {
1411 ERROR("failed to save starting configuration for %s", c
->name
);
1412 // parent task won't see bdev in config so we delete it
1413 bdev
->ops
->umount(bdev
);
1414 bdev
->ops
->destroy(bdev
);
1419 if (wait_for_pid(pid
) != 0)
1422 /* reload config to get the rootfs */
1423 lxc_conf_free(c
->lxc_conf
);
1425 if (!load_config_locked(c
, c
->configfile
))
1428 if (!create_run_template(c
, tpath
, !!(flags
& LXC_CREATE_QUIET
), argv
))
1431 // now clear out the lxc_conf we have, reload from the created
1433 do_lxcapi_clear_config(c
);
1436 if (!prepend_lxc_header(c
->configfile
, tpath
, argv
)) {
1437 ERROR("Error prepending header to configuration file");
1441 ret
= load_config_locked(c
, c
->configfile
);
1444 if (partial_fd
>= 0)
1445 remove_partial(c
, partial_fd
);
1448 container_destroy(c
);
1454 static bool lxcapi_create(struct lxc_container
*c
, const char *t
,
1455 const char *bdevtype
, struct bdev_specs
*specs
, int flags
,
1459 current_config
= c
? c
->lxc_conf
: NULL
;
1460 ret
= do_lxcapi_create(c
, t
, bdevtype
, specs
, flags
, argv
);
1461 current_config
= NULL
;
1465 static bool do_lxcapi_reboot(struct lxc_container
*c
)
1468 int rebootsignal
= SIGINT
;
1472 if (!do_lxcapi_is_running(c
))
1474 pid
= do_lxcapi_init_pid(c
);
1477 if (c
->lxc_conf
&& c
->lxc_conf
->rebootsignal
)
1478 rebootsignal
= c
->lxc_conf
->rebootsignal
;
1479 if (kill(pid
, rebootsignal
) < 0)
1485 WRAP_API(bool, lxcapi_reboot
)
1487 static bool do_lxcapi_shutdown(struct lxc_container
*c
, int timeout
)
1491 int haltsignal
= SIGPWR
;
1496 if (!do_lxcapi_is_running(c
))
1498 pid
= do_lxcapi_init_pid(c
);
1501 if (c
->lxc_conf
&& c
->lxc_conf
->haltsignal
)
1502 haltsignal
= c
->lxc_conf
->haltsignal
;
1503 kill(pid
, haltsignal
);
1504 retv
= do_lxcapi_wait(c
, "STOPPED", timeout
);
1508 WRAP_API_1(bool, lxcapi_shutdown
, int)
1510 static bool lxcapi_createl(struct lxc_container
*c
, const char *t
,
1511 const char *bdevtype
, struct bdev_specs
*specs
, int flags
, ...)
1520 current_config
= c
->lxc_conf
;
1523 * since we're going to wait for create to finish, I don't think we
1524 * need to get a copy of the arguments.
1526 va_start(ap
, flags
);
1527 args
= lxc_va_arg_list_to_argv(ap
, 0, 0);
1530 ERROR("Memory allocation error.");
1534 bret
= do_lxcapi_create(c
, t
, bdevtype
, specs
, flags
, args
);
1538 current_config
= NULL
;
1542 static void do_clear_unexp_config_line(struct lxc_conf
*conf
, const char *key
)
1544 if (strcmp(key
, "lxc.cgroup") == 0)
1545 clear_unexp_config_line(conf
, key
, true);
1546 else if (strcmp(key
, "lxc.network") == 0)
1547 clear_unexp_config_line(conf
, key
, true);
1548 else if (strcmp(key
, "lxc.hook") == 0)
1549 clear_unexp_config_line(conf
, key
, true);
1551 clear_unexp_config_line(conf
, key
, false);
1552 if (!do_append_unexp_config_line(conf
, key
, ""))
1553 WARN("Error clearing configuration for %s", key
);
1556 static bool do_lxcapi_clear_config_item(struct lxc_container
*c
, const char *key
)
1560 if (!c
|| !c
->lxc_conf
)
1562 if (container_mem_lock(c
))
1564 ret
= lxc_clear_config_item(c
->lxc_conf
, key
);
1566 do_clear_unexp_config_line(c
->lxc_conf
, key
);
1567 container_mem_unlock(c
);
1571 WRAP_API_1(bool, lxcapi_clear_config_item
, const char *)
1573 static inline bool enter_net_ns(struct lxc_container
*c
)
1575 pid_t pid
= do_lxcapi_init_pid(c
);
1577 if ((geteuid() != 0 || (c
->lxc_conf
&& !lxc_list_empty(&c
->lxc_conf
->id_map
))) && access("/proc/self/ns/user", F_OK
) == 0) {
1578 if (!switch_to_ns(pid
, "user"))
1581 return switch_to_ns(pid
, "net");
1584 // used by qsort and bsearch functions for comparing names
1585 static inline int string_cmp(char **first
, char **second
)
1587 return strcmp(*first
, *second
);
1590 // used by qsort and bsearch functions for comparing container names
1591 static inline int container_cmp(struct lxc_container
**first
, struct lxc_container
**second
)
1593 return strcmp((*first
)->name
, (*second
)->name
);
1596 static bool add_to_array(char ***names
, char *cname
, int pos
)
1598 char **newnames
= realloc(*names
, (pos
+1) * sizeof(char *));
1600 ERROR("Out of memory");
1605 newnames
[pos
] = strdup(cname
);
1609 // sort the arrray as we will use binary search on it
1610 qsort(newnames
, pos
+ 1, sizeof(char *), (int (*)(const void *,const void *))string_cmp
);
1615 static bool add_to_clist(struct lxc_container
***list
, struct lxc_container
*c
, int pos
, bool sort
)
1617 struct lxc_container
**newlist
= realloc(*list
, (pos
+1) * sizeof(struct lxc_container
*));
1619 ERROR("Out of memory");
1626 // sort the arrray as we will use binary search on it
1628 qsort(newlist
, pos
+ 1, sizeof(struct lxc_container
*), (int (*)(const void *,const void *))container_cmp
);
1633 static char** get_from_array(char ***names
, char *cname
, int size
)
1635 return (char **)bsearch(&cname
, *names
, size
, sizeof(char *), (int (*)(const void *, const void *))string_cmp
);
1639 static bool array_contains(char ***names
, char *cname
, int size
) {
1640 if(get_from_array(names
, cname
, size
) != NULL
)
1645 static bool remove_from_array(char ***names
, char *cname
, int size
)
1647 char **result
= get_from_array(names
, cname
, size
);
1648 if (result
!= NULL
) {
1655 static char ** do_lxcapi_get_interfaces(struct lxc_container
*c
)
1658 int i
, count
= 0, pipefd
[2];
1659 char **interfaces
= NULL
;
1660 char interface
[IFNAMSIZ
];
1662 if(pipe(pipefd
) < 0) {
1663 SYSERROR("pipe failed");
1669 SYSERROR("failed to fork task to get interfaces information");
1675 if (pid
== 0) { // child
1676 int ret
= 1, nbytes
;
1677 struct ifaddrs
*interfaceArray
= NULL
, *tempIfAddr
= NULL
;
1679 /* close the read-end of the pipe */
1682 if (!enter_net_ns(c
)) {
1683 SYSERROR("failed to enter namespace");
1687 /* Grab the list of interfaces */
1688 if (getifaddrs(&interfaceArray
)) {
1689 SYSERROR("failed to get interfaces list");
1693 /* Iterate through the interfaces */
1694 for (tempIfAddr
= interfaceArray
; tempIfAddr
!= NULL
; tempIfAddr
= tempIfAddr
->ifa_next
) {
1695 nbytes
= write(pipefd
[1], tempIfAddr
->ifa_name
, IFNAMSIZ
);
1697 ERROR("write failed");
1706 freeifaddrs(interfaceArray
);
1708 /* close the write-end of the pipe, thus sending EOF to the reader */
1713 /* close the write-end of the pipe */
1716 while (read(pipefd
[0], &interface
, IFNAMSIZ
) == IFNAMSIZ
) {
1717 if (array_contains(&interfaces
, interface
, count
))
1720 if(!add_to_array(&interfaces
, interface
, count
))
1721 ERROR("PARENT: add_to_array failed");
1725 if (wait_for_pid(pid
) != 0) {
1726 for(i
=0;i
<count
;i
++)
1727 free(interfaces
[i
]);
1732 /* close the read-end of the pipe */
1735 /* Append NULL to the array */
1737 interfaces
= (char **)lxc_append_null_to_array((void **)interfaces
, count
);
1742 WRAP_API(char **, lxcapi_get_interfaces
)
1744 static char** do_lxcapi_get_ips(struct lxc_container
*c
, const char* interface
, const char* family
, int scope
)
1747 int i
, count
= 0, pipefd
[2];
1748 char **addresses
= NULL
;
1749 char address
[INET6_ADDRSTRLEN
];
1751 if(pipe(pipefd
) < 0) {
1752 SYSERROR("pipe failed");
1758 SYSERROR("failed to fork task to get container ips");
1764 if (pid
== 0) { // child
1765 int ret
= 1, nbytes
;
1766 struct ifaddrs
*interfaceArray
= NULL
, *tempIfAddr
= NULL
;
1767 char addressOutputBuffer
[INET6_ADDRSTRLEN
];
1768 void *tempAddrPtr
= NULL
;
1769 char *address
= NULL
;
1771 /* close the read-end of the pipe */
1774 if (!enter_net_ns(c
)) {
1775 SYSERROR("failed to enter namespace");
1779 /* Grab the list of interfaces */
1780 if (getifaddrs(&interfaceArray
)) {
1781 SYSERROR("failed to get interfaces list");
1785 /* Iterate through the interfaces */
1786 for (tempIfAddr
= interfaceArray
; tempIfAddr
!= NULL
; tempIfAddr
= tempIfAddr
->ifa_next
) {
1787 if (tempIfAddr
->ifa_addr
== NULL
)
1790 if(tempIfAddr
->ifa_addr
->sa_family
== AF_INET
) {
1791 if (family
&& strcmp(family
, "inet"))
1793 tempAddrPtr
= &((struct sockaddr_in
*)tempIfAddr
->ifa_addr
)->sin_addr
;
1796 if (family
&& strcmp(family
, "inet6"))
1799 if (((struct sockaddr_in6
*)tempIfAddr
->ifa_addr
)->sin6_scope_id
!= scope
)
1802 tempAddrPtr
= &((struct sockaddr_in6
*)tempIfAddr
->ifa_addr
)->sin6_addr
;
1805 if (interface
&& strcmp(interface
, tempIfAddr
->ifa_name
))
1807 else if (!interface
&& strcmp("lo", tempIfAddr
->ifa_name
) == 0)
1810 address
= (char *)inet_ntop(tempIfAddr
->ifa_addr
->sa_family
,
1812 addressOutputBuffer
,
1813 sizeof(addressOutputBuffer
));
1817 nbytes
= write(pipefd
[1], address
, INET6_ADDRSTRLEN
);
1819 ERROR("write failed");
1828 freeifaddrs(interfaceArray
);
1830 /* close the write-end of the pipe, thus sending EOF to the reader */
1835 /* close the write-end of the pipe */
1838 while (read(pipefd
[0], &address
, INET6_ADDRSTRLEN
) == INET6_ADDRSTRLEN
) {
1839 if(!add_to_array(&addresses
, address
, count
))
1840 ERROR("PARENT: add_to_array failed");
1844 if (wait_for_pid(pid
) != 0) {
1845 for(i
=0;i
<count
;i
++)
1851 /* close the read-end of the pipe */
1854 /* Append NULL to the array */
1856 addresses
= (char **)lxc_append_null_to_array((void **)addresses
, count
);
1861 WRAP_API_3(char **, lxcapi_get_ips
, const char *, const char *, int)
1863 static int do_lxcapi_get_config_item(struct lxc_container
*c
, const char *key
, char *retv
, int inlen
)
1867 if (!c
|| !c
->lxc_conf
)
1869 if (container_mem_lock(c
))
1871 ret
= lxc_get_config_item(c
->lxc_conf
, key
, retv
, inlen
);
1872 container_mem_unlock(c
);
1876 WRAP_API_3(int, lxcapi_get_config_item
, const char *, char *, int)
1878 static char* do_lxcapi_get_running_config_item(struct lxc_container
*c
, const char *key
)
1882 if (!c
|| !c
->lxc_conf
)
1884 if (container_mem_lock(c
))
1886 ret
= lxc_cmd_get_config_item(c
->name
, key
, do_lxcapi_get_config_path(c
));
1887 container_mem_unlock(c
);
1891 WRAP_API_1(char *, lxcapi_get_running_config_item
, const char *)
1893 static int do_lxcapi_get_keys(struct lxc_container
*c
, const char *key
, char *retv
, int inlen
)
1896 return lxc_listconfigs(retv
, inlen
);
1898 * Support 'lxc.network.<idx>', i.e. 'lxc.network.0'
1899 * This is an intelligent result to show which keys are valid given
1900 * the type of nic it is
1902 if (!c
|| !c
->lxc_conf
)
1904 if (container_mem_lock(c
))
1907 if (strncmp(key
, "lxc.network.", 12) == 0)
1908 ret
= lxc_list_nicconfigs(c
->lxc_conf
, key
, retv
, inlen
);
1909 container_mem_unlock(c
);
1913 WRAP_API_3(int, lxcapi_get_keys
, const char *, char *, int)
1915 static bool do_lxcapi_save_config(struct lxc_container
*c
, const char *alt_file
)
1918 bool ret
= false, need_disklock
= false;
1922 alt_file
= c
->configfile
;
1924 return false; // should we write to stdout if no file is specified?
1926 // If we haven't yet loaded a config, load the stock config
1928 if (!do_lxcapi_load_config(c
, lxc_global_config_value("lxc.default_config"))) {
1929 ERROR("Error loading default configuration file %s while saving %s", lxc_global_config_value("lxc.default_config"), c
->name
);
1934 if (!create_container_dir(c
))
1938 * If we're writing to the container's config file, take the
1939 * disk lock. Otherwise just take the memlock to protect the
1940 * struct lxc_container while we're traversing it.
1942 if (strcmp(c
->configfile
, alt_file
) == 0)
1943 need_disklock
= true;
1946 lret
= container_disk_lock(c
);
1948 lret
= container_mem_lock(c
);
1953 fout
= fopen(alt_file
, "w");
1956 write_config(fout
, c
->lxc_conf
);
1962 container_disk_unlock(c
);
1964 container_mem_unlock(c
);
1968 WRAP_API_1(bool, lxcapi_save_config
, const char *)
1970 static bool mod_rdep(struct lxc_container
*c
, bool inc
)
1972 char path
[MAXPATHLEN
];
1977 if (container_disk_lock(c
))
1979 ret
= snprintf(path
, MAXPATHLEN
, "%s/%s/lxc_snapshots", c
->config_path
,
1981 if (ret
< 0 || ret
> MAXPATHLEN
)
1983 f
= fopen(path
, "r");
1985 ret
= fscanf(f
, "%d", &v
);
1988 ERROR("Corrupted file %s", path
);
1993 f
= fopen(path
, "w");
1996 if (fprintf(f
, "%d\n", v
) < 0) {
1997 ERROR("Error writing new snapshots value");
2003 SYSERROR("Error writing to or closing snapshots file");
2010 container_disk_unlock(c
);
2014 static void strip_newline(char *p
)
2016 size_t len
= strlen(p
);
2019 if (p
[len
-1] == '\n')
2023 static void mod_all_rdeps(struct lxc_container
*c
, bool inc
)
2025 struct lxc_container
*p
;
2026 char *lxcpath
= NULL
, *lxcname
= NULL
, path
[MAXPATHLEN
];
2027 size_t pathlen
= 0, namelen
= 0;
2031 ret
= snprintf(path
, MAXPATHLEN
, "%s/%s/lxc_rdepends",
2032 c
->config_path
, c
->name
);
2033 if (ret
< 0 || ret
>= MAXPATHLEN
) {
2034 ERROR("Path name too long");
2037 f
= fopen(path
, "r");
2040 while (getline(&lxcpath
, &pathlen
, f
) != -1) {
2041 if (getline(&lxcname
, &namelen
, f
) == -1) {
2042 ERROR("badly formatted file %s", path
);
2045 strip_newline(lxcpath
);
2046 strip_newline(lxcname
);
2047 if ((p
= lxc_container_new(lxcname
, lxcpath
)) == NULL
) {
2048 ERROR("Unable to find dependent container %s:%s",
2052 if (!mod_rdep(p
, inc
))
2053 ERROR("Failed to increase numsnapshots for %s:%s",
2055 lxc_container_put(p
);
2063 static bool has_fs_snapshots(struct lxc_container
*c
)
2065 char path
[MAXPATHLEN
];
2070 ret
= snprintf(path
, MAXPATHLEN
, "%s/%s/lxc_snapshots", c
->config_path
,
2072 if (ret
< 0 || ret
> MAXPATHLEN
)
2074 f
= fopen(path
, "r");
2077 ret
= fscanf(f
, "%d", &v
);
2087 static bool has_snapshots(struct lxc_container
*c
)
2089 char path
[MAXPATHLEN
];
2090 struct dirent dirent
, *direntp
;
2094 if (!get_snappath_dir(c
, path
))
2096 dir
= opendir(path
);
2099 while (!readdir_r(dir
, &dirent
, &direntp
)) {
2103 if (!strcmp(direntp
->d_name
, "."))
2106 if (!strcmp(direntp
->d_name
, ".."))
2115 static int lxc_rmdir_onedev_wrapper(void *data
)
2117 char *arg
= (char *) data
;
2118 return lxc_rmdir_onedev(arg
, "snaps");
2121 static int do_bdev_destroy(struct lxc_conf
*conf
)
2126 r
= bdev_init(conf
, conf
->rootfs
.path
, conf
->rootfs
.mount
, NULL
);
2130 if (r
->ops
->destroy(r
) < 0)
2136 static int bdev_destroy_wrapper(void *data
)
2138 struct lxc_conf
*conf
= data
;
2140 if (setgid(0) < 0) {
2141 ERROR("Failed to setgid to 0");
2144 if (setgroups(0, NULL
) < 0)
2145 WARN("Failed to clear groups");
2146 if (setuid(0) < 0) {
2147 ERROR("Failed to setuid to 0");
2150 return do_bdev_destroy(conf
);
2153 static bool container_destroy(struct lxc_container
*c
)
2158 if (!c
|| !do_lxcapi_is_defined(c
))
2161 if (container_disk_lock(c
))
2164 if (!is_stopped(c
)) {
2165 // we should queue some sort of error - in c->error_string?
2166 ERROR("container %s is not stopped", c
->name
);
2170 if (current_config
&& c
->lxc_conf
== current_config
) {
2171 current_config
= NULL
;
2172 if (c
->lxc_conf
->logfd
!= -1) {
2173 close(c
->lxc_conf
->logfd
);
2174 c
->lxc_conf
->logfd
= -1;
2178 if (c
->lxc_conf
&& c
->lxc_conf
->rootfs
.path
&& c
->lxc_conf
->rootfs
.mount
) {
2180 ret
= userns_exec_1(c
->lxc_conf
, bdev_destroy_wrapper
, c
->lxc_conf
);
2182 ret
= do_bdev_destroy(c
->lxc_conf
);
2184 ERROR("Error destroying rootfs for %s", c
->name
);
2189 mod_all_rdeps(c
, false);
2191 const char *p1
= do_lxcapi_get_config_path(c
);
2192 char *path
= alloca(strlen(p1
) + strlen(c
->name
) + 2);
2193 sprintf(path
, "%s/%s", p1
, c
->name
);
2195 ret
= userns_exec_1(c
->lxc_conf
, lxc_rmdir_onedev_wrapper
, path
);
2197 ret
= lxc_rmdir_onedev(path
, "snaps");
2199 ERROR("Error destroying container directory for %s", c
->name
);
2205 container_disk_unlock(c
);
2209 static bool do_lxcapi_destroy(struct lxc_container
*c
)
2211 if (!c
|| !lxcapi_is_defined(c
))
2213 if (has_snapshots(c
)) {
2214 ERROR("Container %s has snapshots; not removing", c
->name
);
2218 if (has_fs_snapshots(c
)) {
2219 ERROR("container %s has snapshots on its rootfs", c
->name
);
2223 return container_destroy(c
);
2226 WRAP_API(bool, lxcapi_destroy
)
2228 static bool do_lxcapi_destroy_with_snapshots(struct lxc_container
*c
)
2230 if (!c
|| !lxcapi_is_defined(c
))
2232 if (!lxcapi_snapshot_destroy_all(c
)) {
2233 ERROR("Error deleting all snapshots");
2236 return lxcapi_destroy(c
);
2239 WRAP_API(bool, lxcapi_destroy_with_snapshots
)
2241 static bool set_config_item_locked(struct lxc_container
*c
, const char *key
, const char *v
)
2243 struct lxc_config_t
*config
;
2246 c
->lxc_conf
= lxc_conf_init();
2249 config
= lxc_getconfig(key
);
2252 if (config
->cb(key
, v
, c
->lxc_conf
) != 0)
2254 return do_append_unexp_config_line(c
->lxc_conf
, key
, v
);
2257 static bool do_lxcapi_set_config_item(struct lxc_container
*c
, const char *key
, const char *v
)
2264 if (container_mem_lock(c
))
2267 b
= set_config_item_locked(c
, key
, v
);
2269 container_mem_unlock(c
);
2273 WRAP_API_2(bool, lxcapi_set_config_item
, const char *, const char *)
2275 static char *lxcapi_config_file_name(struct lxc_container
*c
)
2277 if (!c
|| !c
->configfile
)
2279 return strdup(c
->configfile
);
2282 static const char *lxcapi_get_config_path(struct lxc_container
*c
)
2284 if (!c
|| !c
->config_path
)
2286 return (const char *)(c
->config_path
);
2291 * Just recalculate the c->configfile based on the
2292 * c->config_path, which must be set.
2293 * The lxc_container must be locked or not yet public.
2295 static bool set_config_filename(struct lxc_container
*c
)
2300 if (!c
->config_path
)
2303 /* $lxc_path + "/" + c->name + "/" + "config" + '\0' */
2304 len
= strlen(c
->config_path
) + strlen(c
->name
) + strlen("config") + 3;
2305 newpath
= malloc(len
);
2309 ret
= snprintf(newpath
, len
, "%s/%s/config", c
->config_path
, c
->name
);
2310 if (ret
< 0 || ret
>= len
) {
2311 fprintf(stderr
, "Error printing out config file name\n");
2316 free(c
->configfile
);
2317 c
->configfile
= newpath
;
2322 static bool do_lxcapi_set_config_path(struct lxc_container
*c
, const char *path
)
2326 char *oldpath
= NULL
;
2331 if (container_mem_lock(c
))
2336 ERROR("Out of memory setting new lxc path");
2342 oldpath
= c
->config_path
;
2345 /* Since we've changed the config path, we have to change the
2346 * config file name too */
2347 if (!set_config_filename(c
)) {
2348 ERROR("Out of memory setting new config filename");
2350 free(c
->config_path
);
2351 c
->config_path
= oldpath
;
2356 container_mem_unlock(c
);
2360 WRAP_API_1(bool, lxcapi_set_config_path
, const char *)
2362 static bool do_lxcapi_set_cgroup_item(struct lxc_container
*c
, const char *subsys
, const char *value
)
2372 if (container_disk_lock(c
))
2375 ret
= lxc_cgroup_set(subsys
, value
, c
->name
, c
->config_path
);
2377 container_disk_unlock(c
);
2381 WRAP_API_2(bool, lxcapi_set_cgroup_item
, const char *, const char *)
2383 static int do_lxcapi_get_cgroup_item(struct lxc_container
*c
, const char *subsys
, char *retv
, int inlen
)
2393 if (container_disk_lock(c
))
2396 ret
= lxc_cgroup_get(subsys
, retv
, inlen
, c
->name
, c
->config_path
);
2398 container_disk_unlock(c
);
2402 WRAP_API_3(int, lxcapi_get_cgroup_item
, const char *, char *, int)
2404 const char *lxc_get_global_config_item(const char *key
)
2406 return lxc_global_config_value(key
);
2409 const char *lxc_get_version(void)
2414 static int copy_file(const char *old
, const char *new)
2421 if (file_exists(new)) {
2422 ERROR("copy destination %s exists", new);
2425 ret
= stat(old
, &sbuf
);
2427 INFO("Error stat'ing %s", old
);
2431 in
= open(old
, O_RDONLY
);
2433 SYSERROR("Error opening original file %s", old
);
2436 out
= open(new, O_CREAT
| O_EXCL
| O_WRONLY
, 0644);
2438 SYSERROR("Error opening new file %s", new);
2444 len
= read(in
, buf
, 8096);
2446 SYSERROR("Error reading old file %s", old
);
2451 ret
= write(out
, buf
, len
);
2452 if (ret
< len
) { // should we retry?
2453 SYSERROR("Error: write to new file %s was interrupted", new);
2460 // we set mode, but not owner/group
2461 ret
= chmod(new, sbuf
.st_mode
);
2463 SYSERROR("Error setting mode on %s", new);
2475 static int copyhooks(struct lxc_container
*oldc
, struct lxc_container
*c
)
2478 struct lxc_list
*it
;
2481 len
= strlen(oldc
->config_path
) + strlen(oldc
->name
) + 3;
2482 cpath
= alloca(len
);
2483 ret
= snprintf(cpath
, len
, "%s/%s/", oldc
->config_path
, oldc
->name
);
2484 if (ret
< 0 || ret
>= len
)
2487 for (i
=0; i
<NUM_LXC_HOOKS
; i
++) {
2488 lxc_list_for_each(it
, &c
->lxc_conf
->hooks
[i
]) {
2489 char *hookname
= it
->elem
;
2490 char *fname
= strrchr(hookname
, '/');
2491 char tmppath
[MAXPATHLEN
];
2492 if (!fname
) // relative path - we don't support, but maybe we should
2494 if (strncmp(hookname
, cpath
, len
- 1) != 0) {
2495 // this hook is public - ignore
2498 // copy the script, and change the entry in confile
2499 ret
= snprintf(tmppath
, MAXPATHLEN
, "%s/%s/%s",
2500 c
->config_path
, c
->name
, fname
+1);
2501 if (ret
< 0 || ret
>= MAXPATHLEN
)
2503 ret
= copy_file(it
->elem
, tmppath
);
2507 it
->elem
= strdup(tmppath
);
2509 ERROR("out of memory copying hook path");
2515 if (!clone_update_unexp_hooks(c
->lxc_conf
, oldc
->config_path
,
2516 c
->config_path
, oldc
->name
, c
->name
)) {
2517 ERROR("Error saving new hooks in clone");
2520 do_lxcapi_save_config(c
, NULL
);
2525 static int copy_fstab(struct lxc_container
*oldc
, struct lxc_container
*c
)
2527 char newpath
[MAXPATHLEN
];
2528 char *oldpath
= oldc
->lxc_conf
->fstab
;
2534 clear_unexp_config_line(c
->lxc_conf
, "lxc.mount", false);
2536 char *p
= strrchr(oldpath
, '/');
2539 ret
= snprintf(newpath
, MAXPATHLEN
, "%s/%s%s",
2540 c
->config_path
, c
->name
, p
);
2541 if (ret
< 0 || ret
>= MAXPATHLEN
) {
2542 ERROR("error printing new path for %s", oldpath
);
2545 if (file_exists(newpath
)) {
2546 ERROR("error: fstab file %s exists", newpath
);
2550 if (copy_file(oldpath
, newpath
) < 0) {
2551 ERROR("error: copying %s to %s", oldpath
, newpath
);
2554 free(c
->lxc_conf
->fstab
);
2555 c
->lxc_conf
->fstab
= strdup(newpath
);
2556 if (!c
->lxc_conf
->fstab
) {
2557 ERROR("error: allocating pathname");
2560 if (!do_append_unexp_config_line(c
->lxc_conf
, "lxc.mount", newpath
)) {
2561 ERROR("error saving new lxctab");
2568 static void copy_rdepends(struct lxc_container
*c
, struct lxc_container
*c0
)
2570 char path0
[MAXPATHLEN
], path1
[MAXPATHLEN
];
2573 ret
= snprintf(path0
, MAXPATHLEN
, "%s/%s/lxc_rdepends", c0
->config_path
,
2575 if (ret
< 0 || ret
>= MAXPATHLEN
) {
2576 WARN("Error copying reverse dependencies");
2579 ret
= snprintf(path1
, MAXPATHLEN
, "%s/%s/lxc_rdepends", c
->config_path
,
2581 if (ret
< 0 || ret
>= MAXPATHLEN
) {
2582 WARN("Error copying reverse dependencies");
2585 if (copy_file(path0
, path1
) < 0) {
2586 INFO("Error copying reverse dependencies");
2591 static bool add_rdepends(struct lxc_container
*c
, struct lxc_container
*c0
)
2594 char path
[MAXPATHLEN
];
2598 ret
= snprintf(path
, MAXPATHLEN
, "%s/%s/lxc_rdepends", c
->config_path
,
2600 if (ret
< 0 || ret
>= MAXPATHLEN
)
2602 f
= fopen(path
, "a");
2606 // if anything goes wrong, just return an error
2607 if (fprintf(f
, "%s\n%s\n", c0
->config_path
, c0
->name
) < 0)
2614 static int copy_storage(struct lxc_container
*c0
, struct lxc_container
*c
,
2615 const char *newtype
, int flags
, const char *bdevdata
, uint64_t newsize
)
2620 bdev
= bdev_copy(c0
, c
->name
, c
->config_path
, newtype
, flags
,
2621 bdevdata
, newsize
, &need_rdep
);
2623 ERROR("Error copying storage");
2626 free(c
->lxc_conf
->rootfs
.path
);
2627 c
->lxc_conf
->rootfs
.path
= strdup(bdev
->src
);
2629 if (!c
->lxc_conf
->rootfs
.path
) {
2630 ERROR("Out of memory while setting storage path");
2633 // We will simply append a new lxc.rootfs entry to the unexpanded config
2634 clear_unexp_config_line(c
->lxc_conf
, "lxc.rootfs", false);
2635 if (!do_append_unexp_config_line(c
->lxc_conf
, "lxc.rootfs", c
->lxc_conf
->rootfs
.path
)) {
2636 ERROR("Error saving new rootfs to cloend config");
2639 if (flags
& LXC_CLONE_SNAPSHOT
)
2640 copy_rdepends(c
, c0
);
2642 if (!add_rdepends(c
, c0
))
2643 WARN("Error adding reverse dependency from %s to %s",
2647 mod_all_rdeps(c
, true);
2652 struct clone_update_data
{
2653 struct lxc_container
*c0
;
2654 struct lxc_container
*c1
;
2659 static int clone_update_rootfs(struct clone_update_data
*data
)
2661 struct lxc_container
*c0
= data
->c0
;
2662 struct lxc_container
*c
= data
->c1
;
2663 int flags
= data
->flags
;
2664 char **hookargs
= data
->hookargs
;
2666 char path
[MAXPATHLEN
];
2669 struct lxc_conf
*conf
= c
->lxc_conf
;
2671 /* update hostname in rootfs */
2672 /* we're going to mount, so run in a clean namespace to simplify cleanup */
2674 if (setgid(0) < 0) {
2675 ERROR("Failed to setgid to 0");
2678 if (setuid(0) < 0) {
2679 ERROR("Failed to setuid to 0");
2682 if (setgroups(0, NULL
) < 0)
2683 WARN("Failed to clear groups");
2685 if (unshare(CLONE_NEWNS
) < 0)
2687 bdev
= bdev_init(c
->lxc_conf
, c
->lxc_conf
->rootfs
.path
, c
->lxc_conf
->rootfs
.mount
, NULL
);
2690 if (strcmp(bdev
->type
, "dir") != 0) {
2691 if (unshare(CLONE_NEWNS
) < 0) {
2692 ERROR("error unsharing mounts");
2696 if (detect_shared_rootfs()) {
2697 if (mount(NULL
, "/", NULL
, MS_SLAVE
|MS_REC
, NULL
)) {
2698 SYSERROR("Failed to make / rslave");
2699 ERROR("Continuing...");
2702 if (bdev
->ops
->mount(bdev
) < 0) {
2706 } else { // TODO come up with a better way
2708 bdev
->dest
= strdup(bdev
->src
);
2711 if (!lxc_list_empty(&conf
->hooks
[LXCHOOK_CLONE
])) {
2712 /* Start of environment variable setup for hooks */
2713 if (setenv("LXC_SRC_NAME", c0
->name
, 1)) {
2714 SYSERROR("failed to set environment variable for source container name");
2716 if (setenv("LXC_NAME", c
->name
, 1)) {
2717 SYSERROR("failed to set environment variable for container name");
2719 if (setenv("LXC_CONFIG_FILE", conf
->rcfile
, 1)) {
2720 SYSERROR("failed to set environment variable for config path");
2722 if (setenv("LXC_ROOTFS_MOUNT", bdev
->dest
, 1)) {
2723 SYSERROR("failed to set environment variable for rootfs mount");
2725 if (setenv("LXC_ROOTFS_PATH", conf
->rootfs
.path
, 1)) {
2726 SYSERROR("failed to set environment variable for rootfs mount");
2729 if (run_lxc_hooks(c
->name
, "clone", conf
, c
->get_config_path(c
), hookargs
)) {
2730 ERROR("Error executing clone hook for %s", c
->name
);
2736 if (!(flags
& LXC_CLONE_KEEPNAME
)) {
2737 ret
= snprintf(path
, MAXPATHLEN
, "%s/etc/hostname", bdev
->dest
);
2740 if (ret
< 0 || ret
>= MAXPATHLEN
)
2742 if (!file_exists(path
))
2744 if (!(fout
= fopen(path
, "w"))) {
2745 SYSERROR("unable to open %s: ignoring", path
);
2748 if (fprintf(fout
, "%s", c
->name
) < 0) {
2752 if (fclose(fout
) < 0)
2761 static int clone_update_rootfs_wrapper(void *data
)
2763 struct clone_update_data
*arg
= (struct clone_update_data
*) data
;
2764 return clone_update_rootfs(arg
);
2768 * We want to support:
2769 sudo lxc-clone -o o1 -n n1 -s -L|-fssize fssize -v|--vgname vgname \
2770 -p|--lvprefix lvprefix -t|--fstype fstype -B backingstore
2772 -s [ implies overlayfs]
2776 only rootfs gets converted (copied/snapshotted) on clone.
2779 static int create_file_dirname(char *path
, struct lxc_conf
*conf
)
2781 char *p
= strrchr(path
, '/');
2787 ret
= do_create_container_dir(path
, conf
);
2792 static struct lxc_container
*do_lxcapi_clone(struct lxc_container
*c
, const char *newname
,
2793 const char *lxcpath
, int flags
,
2794 const char *bdevtype
, const char *bdevdata
, uint64_t newsize
,
2797 struct lxc_container
*c2
= NULL
;
2798 char newpath
[MAXPATHLEN
];
2799 int ret
, storage_copied
= 0;
2800 char *origroot
= NULL
;
2801 struct clone_update_data data
;
2805 if (!c
|| !do_lxcapi_is_defined(c
))
2808 if (container_mem_lock(c
))
2811 if (!is_stopped(c
)) {
2812 ERROR("error: Original container (%s) is running", c
->name
);
2816 // Make sure the container doesn't yet exist.
2820 lxcpath
= do_lxcapi_get_config_path(c
);
2821 ret
= snprintf(newpath
, MAXPATHLEN
, "%s/%s/config", lxcpath
, newname
);
2822 if (ret
< 0 || ret
>= MAXPATHLEN
) {
2823 SYSERROR("clone: failed making config pathname");
2826 if (file_exists(newpath
)) {
2827 ERROR("error: clone: %s exists", newpath
);
2831 ret
= create_file_dirname(newpath
, c
->lxc_conf
);
2832 if (ret
< 0 && errno
!= EEXIST
) {
2833 ERROR("Error creating container dir for %s", newpath
);
2837 // copy the configuration, tweak it as needed,
2838 if (c
->lxc_conf
->rootfs
.path
) {
2839 origroot
= c
->lxc_conf
->rootfs
.path
;
2840 c
->lxc_conf
->rootfs
.path
= NULL
;
2842 fout
= fopen(newpath
, "w");
2844 SYSERROR("open %s", newpath
);
2847 write_config(fout
, c
->lxc_conf
);
2849 c
->lxc_conf
->rootfs
.path
= origroot
;
2851 sprintf(newpath
, "%s/%s/rootfs", lxcpath
, newname
);
2852 if (mkdir(newpath
, 0755) < 0) {
2853 SYSERROR("error creating %s", newpath
);
2858 if (chown_mapped_root(newpath
, c
->lxc_conf
) < 0) {
2859 ERROR("Error chowning %s to container root", newpath
);
2864 c2
= lxc_container_new(newname
, lxcpath
);
2866 ERROR("clone: failed to create new container (%s %s)", newname
,
2871 // copy/snapshot rootfs's
2872 ret
= copy_storage(c
, c2
, bdevtype
, flags
, bdevdata
, newsize
);
2876 clear_unexp_config_line(c2
->lxc_conf
, "lxc.utsname", false);
2879 if (!set_config_item_locked(c2
, "lxc.utsname", newname
)) {
2880 ERROR("Error setting new hostname");
2885 ret
= copyhooks(c
, c2
);
2887 ERROR("error copying hooks");
2891 if (copy_fstab(c
, c2
) < 0) {
2892 ERROR("error copying fstab");
2897 if (!(flags
& LXC_CLONE_KEEPMACADDR
)) {
2898 if (!network_new_hwaddrs(c2
->lxc_conf
)) {
2899 ERROR("Error updating mac addresses");
2904 // We've now successfully created c2's storage, so clear it out if we
2908 if (!c2
->save_config(c2
, NULL
))
2911 if ((pid
= fork()) < 0) {
2916 ret
= wait_for_pid(pid
);
2919 container_mem_unlock(c
);
2925 data
.hookargs
= hookargs
;
2927 ret
= userns_exec_1(c
->lxc_conf
, clone_update_rootfs_wrapper
,
2930 ret
= clone_update_rootfs(&data
);
2934 container_mem_unlock(c
);
2938 container_mem_unlock(c
);
2940 if (!storage_copied
)
2941 c2
->lxc_conf
->rootfs
.path
= NULL
;
2943 lxc_container_put(c2
);
2949 static struct lxc_container
*lxcapi_clone(struct lxc_container
*c
, const char *newname
,
2950 const char *lxcpath
, int flags
,
2951 const char *bdevtype
, const char *bdevdata
, uint64_t newsize
,
2954 struct lxc_container
* ret
;
2955 current_config
= c
? c
->lxc_conf
: NULL
;
2956 ret
= do_lxcapi_clone(c
, newname
, lxcpath
, flags
, bdevtype
, bdevdata
, newsize
, hookargs
);
2957 current_config
= NULL
;
2961 static bool do_lxcapi_rename(struct lxc_container
*c
, const char *newname
)
2964 struct lxc_container
*newc
;
2966 if (!c
|| !c
->name
|| !c
->config_path
|| !c
->lxc_conf
)
2969 if (has_fs_snapshots(c
) || has_snapshots(c
)) {
2970 ERROR("Renaming a container with snapshots is not supported");
2973 bdev
= bdev_init(c
->lxc_conf
, c
->lxc_conf
->rootfs
.path
, c
->lxc_conf
->rootfs
.mount
, NULL
);
2975 ERROR("Failed to find original backing store type");
2979 newc
= lxcapi_clone(c
, newname
, c
->config_path
, LXC_CLONE_KEEPMACADDR
, NULL
, bdev
->type
, 0, NULL
);
2982 lxc_container_put(newc
);
2986 if (newc
&& lxcapi_is_defined(newc
))
2987 lxc_container_put(newc
);
2989 if (!container_destroy(c
)) {
2990 ERROR("Could not destroy existing container %s", c
->name
);
2996 WRAP_API_1(bool, lxcapi_rename
, const char *)
2998 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
)
3005 current_config
= c
->lxc_conf
;
3007 ret
= lxc_attach(c
->name
, c
->config_path
, exec_function
, exec_payload
, options
, attached_process
);
3008 current_config
= NULL
;
3012 static int do_lxcapi_attach_run_wait(struct lxc_container
*c
, lxc_attach_options_t
*options
, const char *program
, const char * const argv
[])
3014 lxc_attach_command_t command
;
3021 command
.program
= (char*)program
;
3022 command
.argv
= (char**)argv
;
3023 r
= lxc_attach(c
->name
, c
->config_path
, lxc_attach_run_command
, &command
, options
, &pid
);
3028 return lxc_wait_for_pid_status(pid
);
3031 static int lxcapi_attach_run_wait(struct lxc_container
*c
, lxc_attach_options_t
*options
, const char *program
, const char * const argv
[])
3034 current_config
= c
? c
->lxc_conf
: NULL
;
3035 ret
= do_lxcapi_attach_run_wait(c
, options
, program
, argv
);
3036 current_config
= NULL
;
3040 static int get_next_index(const char *lxcpath
, char *cname
)
3046 fname
= alloca(strlen(lxcpath
) + 20);
3048 sprintf(fname
, "%s/snap%d", lxcpath
, i
);
3049 ret
= stat(fname
, &sb
);
3056 static bool get_snappath_dir(struct lxc_container
*c
, char *snappath
)
3060 * If the old style snapshot path exists, use it
3061 * /var/lib/lxc -> /var/lib/lxcsnaps
3063 ret
= snprintf(snappath
, MAXPATHLEN
, "%ssnaps", c
->config_path
);
3064 if (ret
< 0 || ret
>= MAXPATHLEN
)
3066 if (dir_exists(snappath
)) {
3067 ret
= snprintf(snappath
, MAXPATHLEN
, "%ssnaps/%s", c
->config_path
, c
->name
);
3068 if (ret
< 0 || ret
>= MAXPATHLEN
)
3074 * Use the new style path
3075 * /var/lib/lxc -> /var/lib/lxc + c->name + /snaps + \0
3077 ret
= snprintf(snappath
, MAXPATHLEN
, "%s/%s/snaps", c
->config_path
, c
->name
);
3078 if (ret
< 0 || ret
>= MAXPATHLEN
)
3083 static int do_lxcapi_snapshot(struct lxc_container
*c
, const char *commentfile
)
3086 struct lxc_container
*c2
;
3087 char snappath
[MAXPATHLEN
], newname
[20];
3089 if (!c
|| !lxcapi_is_defined(c
))
3092 if (!bdev_can_backup(c
->lxc_conf
)) {
3093 ERROR("%s's backing store cannot be backed up.", c
->name
);
3094 ERROR("Your container must use another backing store type.");
3098 if (!get_snappath_dir(c
, snappath
))
3101 i
= get_next_index(snappath
, c
->name
);
3103 if (mkdir_p(snappath
, 0755) < 0) {
3104 ERROR("Failed to create snapshot directory %s", snappath
);
3108 ret
= snprintf(newname
, 20, "snap%d", i
);
3109 if (ret
< 0 || ret
>= 20)
3113 * We pass LXC_CLONE_SNAPSHOT to make sure that a rdepends file entry is
3114 * created in the original container
3116 flags
= LXC_CLONE_SNAPSHOT
| LXC_CLONE_KEEPMACADDR
| LXC_CLONE_KEEPNAME
|
3117 LXC_CLONE_KEEPBDEVTYPE
| LXC_CLONE_MAYBE_SNAPSHOT
;
3118 if (bdev_is_dir(c
->lxc_conf
, c
->lxc_conf
->rootfs
.path
)) {
3119 ERROR("Snapshot of directory-backed container requested.");
3120 ERROR("Making a copy-clone. If you do want snapshots, then");
3121 ERROR("please create an aufs or overlayfs clone first, snapshot that");
3122 ERROR("and keep the original container pristine.");
3123 flags
&= ~LXC_CLONE_SNAPSHOT
| LXC_CLONE_MAYBE_SNAPSHOT
;
3125 c2
= do_lxcapi_clone(c
, newname
, snappath
, flags
, NULL
, NULL
, 0, NULL
);
3127 ERROR("clone of %s:%s failed", c
->config_path
, c
->name
);
3131 lxc_container_put(c2
);
3133 // Now write down the creation time
3140 tm_info
= localtime(&timer
);
3142 strftime(buffer
, 25, "%Y:%m:%d %H:%M:%S", tm_info
);
3144 char *dfnam
= alloca(strlen(snappath
) + strlen(newname
) + 5);
3145 sprintf(dfnam
, "%s/%s/ts", snappath
, newname
);
3146 f
= fopen(dfnam
, "w");
3148 ERROR("Failed to open %s", dfnam
);
3151 if (fprintf(f
, "%s", buffer
) < 0) {
3152 SYSERROR("Writing timestamp");
3158 SYSERROR("Writing timestamp");
3163 // $p / $name / comment \0
3164 int len
= strlen(snappath
) + strlen(newname
) + 10;
3165 char *path
= alloca(len
);
3166 sprintf(path
, "%s/%s/comment", snappath
, newname
);
3167 return copy_file(commentfile
, path
) < 0 ? -1 : i
;
3173 WRAP_API_1(int, lxcapi_snapshot
, const char *)
3175 static void lxcsnap_free(struct lxc_snapshot
*s
)
3178 free(s
->comment_pathname
);
3183 static char *get_snapcomment_path(char* snappath
, char *name
)
3185 // $snappath/$name/comment
3186 int ret
, len
= strlen(snappath
) + strlen(name
) + 10;
3187 char *s
= malloc(len
);
3190 ret
= snprintf(s
, len
, "%s/%s/comment", snappath
, name
);
3191 if (ret
< 0 || ret
>= len
) {
3199 static char *get_timestamp(char* snappath
, char *name
)
3201 char path
[MAXPATHLEN
], *s
= NULL
;
3205 ret
= snprintf(path
, MAXPATHLEN
, "%s/%s/ts", snappath
, name
);
3206 if (ret
< 0 || ret
>= MAXPATHLEN
)
3208 fin
= fopen(path
, "r");
3211 (void) fseek(fin
, 0, SEEK_END
);
3213 (void) fseek(fin
, 0, SEEK_SET
);
3218 if (fread(s
, 1, len
, fin
) != len
) {
3219 SYSERROR("reading timestamp");
3229 static int do_lxcapi_snapshot_list(struct lxc_container
*c
, struct lxc_snapshot
**ret_snaps
)
3231 char snappath
[MAXPATHLEN
], path2
[MAXPATHLEN
];
3233 struct dirent dirent
, *direntp
;
3234 struct lxc_snapshot
*snaps
=NULL
, *nsnaps
;
3237 if (!c
|| !lxcapi_is_defined(c
))
3240 if (!get_snappath_dir(c
, snappath
)) {
3241 ERROR("path name too long");
3244 dir
= opendir(snappath
);
3246 INFO("failed to open %s - assuming no snapshots", snappath
);
3250 while (!readdir_r(dir
, &dirent
, &direntp
)) {
3254 if (!strcmp(direntp
->d_name
, "."))
3257 if (!strcmp(direntp
->d_name
, ".."))
3260 ret
= snprintf(path2
, MAXPATHLEN
, "%s/%s/config", snappath
, direntp
->d_name
);
3261 if (ret
< 0 || ret
>= MAXPATHLEN
) {
3262 ERROR("pathname too long");
3265 if (!file_exists(path2
))
3267 nsnaps
= realloc(snaps
, (count
+ 1)*sizeof(*snaps
));
3269 SYSERROR("Out of memory");
3273 snaps
[count
].free
= lxcsnap_free
;
3274 snaps
[count
].name
= strdup(direntp
->d_name
);
3275 if (!snaps
[count
].name
)
3277 snaps
[count
].lxcpath
= strdup(snappath
);
3278 if (!snaps
[count
].lxcpath
) {
3279 free(snaps
[count
].name
);
3282 snaps
[count
].comment_pathname
= get_snapcomment_path(snappath
, direntp
->d_name
);
3283 snaps
[count
].timestamp
= get_timestamp(snappath
, direntp
->d_name
);
3288 WARN("failed to close directory");
3296 for (i
=0; i
<count
; i
++)
3297 lxcsnap_free(&snaps
[i
]);
3301 WARN("failed to close directory");
3305 WRAP_API_1(int, lxcapi_snapshot_list
, struct lxc_snapshot
**)
3307 static bool do_lxcapi_snapshot_restore(struct lxc_container
*c
, const char *snapname
, const char *newname
)
3309 char clonelxcpath
[MAXPATHLEN
];
3311 struct lxc_container
*snap
, *rest
;
3315 if (!c
|| !c
->name
|| !c
->config_path
)
3318 if (has_fs_snapshots(c
)) {
3319 ERROR("container rootfs has dependent snapshots");
3323 bdev
= bdev_init(c
->lxc_conf
, c
->lxc_conf
->rootfs
.path
, c
->lxc_conf
->rootfs
.mount
, NULL
);
3325 ERROR("Failed to find original backing store type");
3332 if (!get_snappath_dir(c
, clonelxcpath
)) {
3336 // how should we lock this?
3338 snap
= lxc_container_new(snapname
, clonelxcpath
);
3339 if (!snap
|| !lxcapi_is_defined(snap
)) {
3340 ERROR("Could not open snapshot %s", snapname
);
3341 if (snap
) lxc_container_put(snap
);
3346 if (strcmp(c
->name
, newname
) == 0) {
3347 if (!container_destroy(c
)) {
3348 ERROR("Could not destroy existing container %s", newname
);
3349 lxc_container_put(snap
);
3355 if (strcmp(bdev
->type
, "dir") != 0 && strcmp(bdev
->type
, "loop") != 0)
3356 flags
= LXC_CLONE_SNAPSHOT
| LXC_CLONE_MAYBE_SNAPSHOT
;
3357 rest
= lxcapi_clone(snap
, newname
, c
->config_path
, flags
,
3358 bdev
->type
, NULL
, 0, NULL
);
3360 if (rest
&& lxcapi_is_defined(rest
))
3363 lxc_container_put(rest
);
3364 lxc_container_put(snap
);
3368 WRAP_API_2(bool, lxcapi_snapshot_restore
, const char *, const char *)
3370 static bool do_snapshot_destroy(const char *snapname
, const char *clonelxcpath
)
3372 struct lxc_container
*snap
= NULL
;
3375 snap
= lxc_container_new(snapname
, clonelxcpath
);
3377 ERROR("Could not find snapshot %s", snapname
);
3381 if (!do_lxcapi_destroy(snap
)) {
3382 ERROR("Could not destroy snapshot %s", snapname
);
3389 lxc_container_put(snap
);
3393 static bool remove_all_snapshots(const char *path
)
3396 struct dirent dirent
, *direntp
;
3399 dir
= opendir(path
);
3401 SYSERROR("opendir on snapshot path %s", path
);
3404 while (!readdir_r(dir
, &dirent
, &direntp
)) {
3407 if (!strcmp(direntp
->d_name
, "."))
3409 if (!strcmp(direntp
->d_name
, ".."))
3411 if (!do_snapshot_destroy(direntp
->d_name
, path
)) {
3420 SYSERROR("Error removing directory %s", path
);
3425 static bool do_lxcapi_snapshot_destroy(struct lxc_container
*c
, const char *snapname
)
3427 char clonelxcpath
[MAXPATHLEN
];
3429 if (!c
|| !c
->name
|| !c
->config_path
|| !snapname
)
3432 if (!get_snappath_dir(c
, clonelxcpath
))
3435 return do_snapshot_destroy(snapname
, clonelxcpath
);
3438 WRAP_API_1(bool, lxcapi_snapshot_destroy
, const char *)
3440 static bool do_lxcapi_snapshot_destroy_all(struct lxc_container
*c
)
3442 char clonelxcpath
[MAXPATHLEN
];
3444 if (!c
|| !c
->name
|| !c
->config_path
)
3447 if (!get_snappath_dir(c
, clonelxcpath
))
3450 return remove_all_snapshots(clonelxcpath
);
3453 WRAP_API(bool, lxcapi_snapshot_destroy_all
)
3455 static bool do_lxcapi_may_control(struct lxc_container
*c
)
3457 return lxc_try_cmd(c
->name
, c
->config_path
) == 0;
3460 WRAP_API(bool, lxcapi_may_control
)
3462 static bool do_add_remove_node(pid_t init_pid
, const char *path
, bool add
,
3465 char chrootpath
[MAXPATHLEN
];
3466 char *directory_path
= NULL
;
3470 if ((pid
= fork()) < 0) {
3471 SYSERROR("failed to fork a child helper");
3475 if (wait_for_pid(pid
) != 0) {
3476 ERROR("Failed to create note in guest");
3482 /* prepare the path */
3483 ret
= snprintf(chrootpath
, MAXPATHLEN
, "/proc/%d/root", init_pid
);
3484 if (ret
< 0 || ret
>= MAXPATHLEN
)
3487 if (chroot(chrootpath
) < 0)
3491 /* remove path if it exists */
3492 if(faccessat(AT_FDCWD
, path
, F_OK
, AT_SYMLINK_NOFOLLOW
) == 0) {
3493 if (unlink(path
) < 0) {
3494 ERROR("unlink failed");
3501 /* create any missing directories */
3502 directory_path
= dirname(strdup(path
));
3503 if (mkdir_p(directory_path
, 0755) < 0 && errno
!= EEXIST
) {
3504 ERROR("failed to create directory");
3508 /* create the device node */
3509 if (mknod(path
, st
->st_mode
, st
->st_rdev
) < 0) {
3510 ERROR("mknod failed");
3517 static bool add_remove_device_node(struct lxc_container
*c
, const char *src_path
, const char *dest_path
, bool add
)
3521 char value
[MAX_BUFFER
];
3524 /* make sure container is running */
3525 if (!do_lxcapi_is_running(c
)) {
3526 ERROR("container is not running");
3530 /* use src_path if dest_path is NULL otherwise use dest_path */
3531 p
= dest_path
? dest_path
: src_path
;
3533 /* make sure we can access p */
3534 if(access(p
, F_OK
) < 0 || stat(p
, &st
) < 0)
3537 /* continue if path is character device or block device */
3538 if (S_ISCHR(st
.st_mode
))
3539 ret
= snprintf(value
, MAX_BUFFER
, "c %d:%d rwm", major(st
.st_rdev
), minor(st
.st_rdev
));
3540 else if (S_ISBLK(st
.st_mode
))
3541 ret
= snprintf(value
, MAX_BUFFER
, "b %d:%d rwm", major(st
.st_rdev
), minor(st
.st_rdev
));
3545 /* check snprintf return code */
3546 if (ret
< 0 || ret
>= MAX_BUFFER
)
3549 if (!do_add_remove_node(do_lxcapi_init_pid(c
), p
, add
, &st
))
3552 /* add or remove device to/from cgroup access list */
3554 if (!do_lxcapi_set_cgroup_item(c
, "devices.allow", value
)) {
3555 ERROR("set_cgroup_item failed while adding the device node");
3559 if (!do_lxcapi_set_cgroup_item(c
, "devices.deny", value
)) {
3560 ERROR("set_cgroup_item failed while removing the device node");
3568 static bool do_lxcapi_add_device_node(struct lxc_container
*c
, const char *src_path
, const char *dest_path
)
3571 ERROR(NOT_SUPPORTED_ERROR
, __FUNCTION__
);
3574 return add_remove_device_node(c
, src_path
, dest_path
, true);
3577 WRAP_API_2(bool, lxcapi_add_device_node
, const char *, const char *)
3579 static bool do_lxcapi_remove_device_node(struct lxc_container
*c
, const char *src_path
, const char *dest_path
)
3582 ERROR(NOT_SUPPORTED_ERROR
, __FUNCTION__
);
3585 return add_remove_device_node(c
, src_path
, dest_path
, false);
3588 WRAP_API_2(bool, lxcapi_remove_device_node
, const char *, const char *)
3590 static bool do_lxcapi_attach_interface(struct lxc_container
*c
, const char *ifname
,
3591 const char *dst_ifname
)
3595 ERROR(NOT_SUPPORTED_ERROR
, __FUNCTION__
);
3600 ERROR("No source interface name given");
3604 ret
= lxc_netdev_isup(ifname
);
3607 /* netdev of ifname is up. */
3608 ret
= lxc_netdev_down(ifname
);
3613 ret
= lxc_netdev_move_by_name(ifname
, do_lxcapi_init_pid(c
), dst_ifname
);
3623 WRAP_API_2(bool, lxcapi_attach_interface
, const char *, const char *)
3625 static bool do_lxcapi_detach_interface(struct lxc_container
*c
, const char *ifname
,
3626 const char *dst_ifname
)
3628 pid_t pid
, pid_outside
;
3631 ERROR(NOT_SUPPORTED_ERROR
, __FUNCTION__
);
3636 ERROR("No source interface name given");
3640 pid_outside
= getpid();
3643 ERROR("failed to fork task to get interfaces information");
3647 if (pid
== 0) { // child
3649 if (!enter_net_ns(c
)) {
3650 ERROR("failed to enter namespace");
3654 ret
= lxc_netdev_isup(ifname
);
3658 /* netdev of ifname is up. */
3660 ret
= lxc_netdev_down(ifname
);
3665 ret
= lxc_netdev_move_by_name(ifname
, pid_outside
, dst_ifname
);
3667 /* -EINVAL means there is no netdev named as ifanme. */
3668 if (ret
== -EINVAL
) {
3669 ERROR("No network device named as %s.", ifname
);
3674 if (wait_for_pid(pid
) != 0)
3680 WRAP_API_2(bool, lxcapi_detach_interface
, const char *, const char *)
3682 static bool do_lxcapi_checkpoint(struct lxc_container
*c
, char *directory
, bool stop
, bool verbose
)
3690 if (mkdir(directory
, 0700) < 0 && errno
!= EEXIST
)
3693 if (!dump_net_info(c
, directory
))
3701 struct criu_opts os
;
3704 os
.directory
= directory
;
3707 os
.verbose
= verbose
;
3709 /* exec_criu() returning is an error */
3713 pid_t w
= waitpid(pid
, &status
, 0);
3715 SYSERROR("waitpid");
3719 if (WIFEXITED(status
)) {
3720 return !WEXITSTATUS(status
);
3727 WRAP_API_3(bool, lxcapi_checkpoint
, char *, bool, bool)
3729 static bool do_lxcapi_restore(struct lxc_container
*c
, char *directory
, bool verbose
)
3739 ERROR("Must be root to restore\n");
3744 ERROR("failed to create pipe");
3757 // this never returns
3758 do_restore(c
, pipefd
[1], directory
, verbose
);
3763 nread
= read(pipefd
[0], &status
, sizeof(status
));
3765 if (sizeof(status
) != nread
) {
3766 ERROR("reading status from pipe failed");
3770 // If the criu process was killed or exited nonzero, wait() for the
3771 // handler, since the restore process died. Otherwise, we don't need to
3772 // wait, since the child becomes the monitor process.
3773 if (!WIFEXITED(status
) || WEXITSTATUS(status
))
3778 if (wait_for_pid(pid
))
3779 ERROR("restore process died");
3783 WRAP_API_2(bool, lxcapi_restore
, char *, bool)
3785 static int lxcapi_attach_run_waitl(struct lxc_container
*c
, lxc_attach_options_t
*options
, const char *program
, const char *arg
, ...)
3794 current_config
= c
->lxc_conf
;
3797 argv
= lxc_va_arg_list_to_argv_const(ap
, 1);
3801 ERROR("Memory allocation error.");
3807 ret
= do_lxcapi_attach_run_wait(c
, options
, program
, (const char * const *)argv
);
3810 current_config
= NULL
;
3814 struct lxc_container
*lxc_container_new(const char *name
, const char *configpath
)
3816 struct lxc_container
*c
;
3821 c
= malloc(sizeof(*c
));
3823 fprintf(stderr
, "failed to malloc lxc_container\n");
3826 memset(c
, 0, sizeof(*c
));
3829 c
->config_path
= strdup(configpath
);
3831 c
->config_path
= strdup(lxc_global_config_value("lxc.lxcpath"));
3833 if (!c
->config_path
) {
3834 fprintf(stderr
, "Out of memory\n");
3838 remove_trailing_slashes(c
->config_path
);
3839 c
->name
= malloc(strlen(name
)+1);
3841 fprintf(stderr
, "Error allocating lxc_container name\n");
3844 strcpy(c
->name
, name
);
3847 if (!(c
->slock
= lxc_newlock(c
->config_path
, name
))) {
3848 fprintf(stderr
, "failed to create lock\n");
3852 if (!(c
->privlock
= lxc_newlock(NULL
, NULL
))) {
3853 fprintf(stderr
, "failed to alloc privlock\n");
3857 if (!set_config_filename(c
)) {
3858 fprintf(stderr
, "Error allocating config file pathname\n");
3862 if (file_exists(c
->configfile
) && !lxcapi_load_config(c
, NULL
))
3865 if (ongoing_create(c
) == 2) {
3866 ERROR("Error: %s creation was not completed", c
->name
);
3867 container_destroy(c
);
3868 lxcapi_clear_config(c
);
3870 c
->daemonize
= true;
3873 // assign the member functions
3874 c
->is_defined
= lxcapi_is_defined
;
3875 c
->state
= lxcapi_state
;
3876 c
->is_running
= lxcapi_is_running
;
3877 c
->freeze
= lxcapi_freeze
;
3878 c
->unfreeze
= lxcapi_unfreeze
;
3879 c
->console
= lxcapi_console
;
3880 c
->console_getfd
= lxcapi_console_getfd
;
3881 c
->init_pid
= lxcapi_init_pid
;
3882 c
->load_config
= lxcapi_load_config
;
3883 c
->want_daemonize
= lxcapi_want_daemonize
;
3884 c
->want_close_all_fds
= lxcapi_want_close_all_fds
;
3885 c
->start
= lxcapi_start
;
3886 c
->startl
= lxcapi_startl
;
3887 c
->stop
= lxcapi_stop
;
3888 c
->config_file_name
= lxcapi_config_file_name
;
3889 c
->wait
= lxcapi_wait
;
3890 c
->set_config_item
= lxcapi_set_config_item
;
3891 c
->destroy
= lxcapi_destroy
;
3892 c
->destroy_with_snapshots
= lxcapi_destroy_with_snapshots
;
3893 c
->rename
= lxcapi_rename
;
3894 c
->save_config
= lxcapi_save_config
;
3895 c
->get_keys
= lxcapi_get_keys
;
3896 c
->create
= lxcapi_create
;
3897 c
->createl
= lxcapi_createl
;
3898 c
->shutdown
= lxcapi_shutdown
;
3899 c
->reboot
= lxcapi_reboot
;
3900 c
->clear_config
= lxcapi_clear_config
;
3901 c
->clear_config_item
= lxcapi_clear_config_item
;
3902 c
->get_config_item
= lxcapi_get_config_item
;
3903 c
->get_running_config_item
= lxcapi_get_running_config_item
;
3904 c
->get_cgroup_item
= lxcapi_get_cgroup_item
;
3905 c
->set_cgroup_item
= lxcapi_set_cgroup_item
;
3906 c
->get_config_path
= lxcapi_get_config_path
;
3907 c
->set_config_path
= lxcapi_set_config_path
;
3908 c
->clone
= lxcapi_clone
;
3909 c
->get_interfaces
= lxcapi_get_interfaces
;
3910 c
->get_ips
= lxcapi_get_ips
;
3911 c
->attach
= lxcapi_attach
;
3912 c
->attach_run_wait
= lxcapi_attach_run_wait
;
3913 c
->attach_run_waitl
= lxcapi_attach_run_waitl
;
3914 c
->snapshot
= lxcapi_snapshot
;
3915 c
->snapshot_list
= lxcapi_snapshot_list
;
3916 c
->snapshot_restore
= lxcapi_snapshot_restore
;
3917 c
->snapshot_destroy
= lxcapi_snapshot_destroy
;
3918 c
->snapshot_destroy_all
= lxcapi_snapshot_destroy_all
;
3919 c
->may_control
= lxcapi_may_control
;
3920 c
->add_device_node
= lxcapi_add_device_node
;
3921 c
->remove_device_node
= lxcapi_remove_device_node
;
3922 c
->attach_interface
= lxcapi_attach_interface
;
3923 c
->detach_interface
= lxcapi_detach_interface
;
3924 c
->checkpoint
= lxcapi_checkpoint
;
3925 c
->restore
= lxcapi_restore
;
3930 lxc_container_free(c
);
3934 int lxc_get_wait_states(const char **states
)
3939 for (i
=0; i
<MAX_STATE
; i
++)
3940 states
[i
] = lxc_state2str(i
);
3945 * These next two could probably be done smarter with reusing a common function
3946 * with different iterators and tests...
3948 int list_defined_containers(const char *lxcpath
, char ***names
, struct lxc_container
***cret
)
3951 int i
, cfound
= 0, nfound
= 0;
3952 struct dirent dirent
, *direntp
;
3953 struct lxc_container
*c
;
3956 lxcpath
= lxc_global_config_value("lxc.lxcpath");
3958 dir
= opendir(lxcpath
);
3960 SYSERROR("opendir on lxcpath");
3969 while (!readdir_r(dir
, &dirent
, &direntp
)) {
3972 if (!strcmp(direntp
->d_name
, "."))
3974 if (!strcmp(direntp
->d_name
, ".."))
3977 if (!config_file_exists(lxcpath
, direntp
->d_name
))
3981 if (!add_to_array(names
, direntp
->d_name
, cfound
))
3991 c
= lxc_container_new(direntp
->d_name
, lxcpath
);
3993 INFO("Container %s:%s has a config but could not be loaded",
3994 lxcpath
, direntp
->d_name
);
3996 if(!remove_from_array(names
, direntp
->d_name
, cfound
--))
4000 if (!do_lxcapi_is_defined(c
)) {
4001 INFO("Container %s:%s has a config but is not defined",
4002 lxcpath
, direntp
->d_name
);
4004 if(!remove_from_array(names
, direntp
->d_name
, cfound
--))
4006 lxc_container_put(c
);
4010 if (!add_to_clist(cret
, c
, nfound
, true)) {
4011 lxc_container_put(c
);
4021 if (names
&& *names
) {
4022 for (i
=0; i
<cfound
; i
++)
4026 if (cret
&& *cret
) {
4027 for (i
=0; i
<nfound
; i
++)
4028 lxc_container_put((*cret
)[i
]);
4035 int list_active_containers(const char *lxcpath
, char ***nret
,
4036 struct lxc_container
***cret
)
4038 int i
, ret
= -1, cret_cnt
= 0, ct_name_cnt
= 0;
4041 char **ct_name
= NULL
;
4043 struct lxc_container
*c
;
4047 lxcpath
= lxc_global_config_value("lxc.lxcpath");
4048 lxcpath_len
= strlen(lxcpath
);
4055 FILE *f
= fopen("/proc/net/unix", "r");
4059 while (getline(&line
, &len
, f
) != -1) {
4061 char *p
= strrchr(line
, ' '), *p2
;
4070 if (strncmp(p
, lxcpath
, lxcpath_len
) == 0) {
4072 } else if (strncmp(p
, "lxc/", 4) == 0) {
4082 // Now p is the start of lxc_name
4083 p2
= strchr(p
, '/');
4084 if (!p2
|| strncmp(p2
, "/command", 8) != 0)
4089 if (strncmp(lxcpath
, lxc_cmd_get_lxcpath(p
), lxcpath_len
) != 0)
4091 p
= lxc_cmd_get_name(p
);
4094 if (array_contains(&ct_name
, p
, ct_name_cnt
))
4097 if (!add_to_array(&ct_name
, p
, ct_name_cnt
))
4098 goto free_cret_list
;
4105 c
= lxc_container_new(p
, lxcpath
);
4107 INFO("Container %s:%s is running but could not be loaded",
4109 remove_from_array(&ct_name
, p
, ct_name_cnt
--);
4114 * If this is an anonymous container, then is_defined *can*
4115 * return false. So we don't do that check. Count on the
4116 * fact that the command socket exists.
4119 if (!add_to_clist(cret
, c
, cret_cnt
, true)) {
4120 lxc_container_put(c
);
4121 goto free_cret_list
;
4126 assert(!nret
|| !cret
|| cret_cnt
== ct_name_cnt
);
4135 if (cret
&& *cret
) {
4136 for (i
= 0; i
< cret_cnt
; i
++)
4137 lxc_container_put((*cret
)[i
]);
4143 for (i
= 0; i
< ct_name_cnt
; i
++)
4155 int list_all_containers(const char *lxcpath
, char ***nret
,
4156 struct lxc_container
***cret
)
4158 int i
, ret
, active_cnt
, ct_cnt
, ct_list_cnt
;
4161 struct lxc_container
**ct_list
= NULL
;
4163 ct_cnt
= list_defined_containers(lxcpath
, &ct_name
, NULL
);
4167 active_cnt
= list_active_containers(lxcpath
, &active_name
, NULL
);
4168 if (active_cnt
< 0) {
4173 for (i
= 0; i
< active_cnt
; i
++) {
4174 if (!array_contains(&ct_name
, active_name
[i
], ct_cnt
)) {
4175 if (!add_to_array(&ct_name
, active_name
[i
], ct_cnt
)) {
4177 goto free_active_name
;
4181 free(active_name
[i
]);
4182 active_name
[i
] = NULL
;
4188 for (i
= 0, ct_list_cnt
= 0; i
< ct_cnt
&& cret
; i
++) {
4189 struct lxc_container
*c
;
4191 c
= lxc_container_new(ct_name
[i
], lxcpath
);
4193 WARN("Container %s:%s could not be loaded", lxcpath
, ct_name
[i
]);
4194 remove_from_array(&ct_name
, ct_name
[i
], ct_cnt
--);
4198 if (!add_to_clist(&ct_list
, c
, ct_list_cnt
, false)) {
4199 lxc_container_put(c
);
4218 for (i
= 0; i
< ct_list_cnt
; i
++) {
4219 lxc_container_put(ct_list
[i
]);
4224 for (i
= 0; i
< active_cnt
; i
++) {
4225 free(active_name
[i
]);
4230 for (i
= 0; i
< ct_cnt
; i
++) {