3 * Copyright © 2012 Serge Hallyn <serge.hallyn@ubuntu.com>.
4 * Copyright © 2012 Canonical Ltd.
6 * This library is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
9 * version 2.1 of the License, or (at your option) any later version.
11 * This library is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Lesser General Public License for more details.
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with this library; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
26 #include <sys/types.h>
28 #include <sys/mount.h>
34 #include <arpa/inet.h>
38 #include <sys/syscall.h>
40 #include <lxc/lxccontainer.h>
41 #include <lxc/version.h>
56 #include "namespace.h"
63 #include <../include/ifaddrs.h>
66 #define MAX_BUFFER 4096
68 #define NOT_SUPPORTED_ERROR "the requested function %s is not currently supported with unprivileged containers"
70 /* Define faccessat() if missing from the C library */
71 #ifndef HAVE_FACCESSAT
72 static int faccessat(int __fd
, const char *__file
, int __type
, int __flag
)
75 return syscall(__NR_faccessat
, __fd
, __file
, __type
, __flag
);
84 lxc_log_define(lxc_container
, lxc
);
86 static bool config_file_exists(const char *lxcpath
, const char *cname
)
88 /* $lxcpath + '/' + $cname + '/config' + \0 */
89 int ret
, len
= strlen(lxcpath
) + strlen(cname
) + 9;
90 char *fname
= alloca(len
);
92 ret
= snprintf(fname
, len
, "%s/%s/config", lxcpath
, cname
);
93 if (ret
< 0 || ret
>= len
)
96 return file_exists(fname
);
100 * A few functions to help detect when a container creation failed.
101 * If a container creation was killed partway through, then trying
102 * to actually start that container could harm the host. We detect
103 * this by creating a 'partial' file under the container directory,
104 * and keeping an advisory lock. When container creation completes,
105 * we remove that file. When we load or try to start a container, if
106 * we find that file, without a flock, we remove the container.
108 static int ongoing_create(struct lxc_container
*c
)
110 int len
= strlen(c
->config_path
) + strlen(c
->name
) + 10;
111 char *path
= alloca(len
);
115 ret
= snprintf(path
, len
, "%s/%s/partial", c
->config_path
, c
->name
);
116 if (ret
< 0 || ret
>= len
) {
117 ERROR("Error writing partial pathname");
121 if (!file_exists(path
))
123 fd
= open(path
, O_RDWR
);
125 // give benefit of the doubt
126 SYSERROR("Error opening partial file");
130 lk
.l_whence
= SEEK_SET
;
134 if (fcntl(fd
, F_GETLK
, &lk
) == 0 && lk
.l_pid
!= -1) {
135 // create is still ongoing
139 // create completed but partial is still there.
144 static int create_partial(struct lxc_container
*c
)
146 // $lxcpath + '/' + $name + '/partial' + \0
147 int len
= strlen(c
->config_path
) + strlen(c
->name
) + 10;
148 char *path
= alloca(len
);
152 ret
= snprintf(path
, len
, "%s/%s/partial", c
->config_path
, c
->name
);
153 if (ret
< 0 || ret
>= len
) {
154 ERROR("Error writing partial pathname");
157 if ((fd
=open(path
, O_RDWR
| O_CREAT
| O_EXCL
, 0755)) < 0) {
158 SYSERROR("Erorr creating partial file");
162 lk
.l_whence
= SEEK_SET
;
165 if (fcntl(fd
, F_SETLKW
, &lk
) < 0) {
166 SYSERROR("Error locking partial file %s", path
);
174 static void remove_partial(struct lxc_container
*c
, int fd
)
176 // $lxcpath + '/' + $name + '/partial' + \0
177 int len
= strlen(c
->config_path
) + strlen(c
->name
) + 10;
178 char *path
= alloca(len
);
182 ret
= snprintf(path
, len
, "%s/%s/partial", c
->config_path
, c
->name
);
183 if (ret
< 0 || ret
>= len
) {
184 ERROR("Error writing partial pathname");
187 if (unlink(path
) < 0)
188 SYSERROR("Error unlink partial file %s", path
);
192 * 1. container_mem_lock(c) protects the struct lxc_container from multiple threads.
193 * 2. container_disk_lock(c) protects the on-disk container data - in particular the
194 * container configuration file.
195 * The container_disk_lock also takes the container_mem_lock.
196 * 3. thread_mutex protects process data (ex: fd table) from multiple threads.
197 * NOTHING mutexes two independent programs with their own struct
198 * lxc_container for the same c->name, between API calls. For instance,
199 * c->config_read(); c->start(); Between those calls, data on disk
200 * could change (which shouldn't bother the caller unless for instance
201 * the rootfs get moved). c->config_read(); update; c->config_write();
202 * Two such updaters could race. The callers should therefore check their
203 * results. Trying to prevent that would necessarily expose us to deadlocks
204 * due to hung callers. So I prefer to keep the locks only within our own
205 * functions, not across functions.
207 * If you're going to clone while holding a lxccontainer, increment
208 * c->numthreads (under privlock) before forking. When deleting,
209 * decrement numthreads under privlock, then if it hits 0 you can delete.
210 * Do not ever use a lxccontainer whose numthreads you did not bump.
213 static void lxc_container_free(struct lxc_container
*c
)
220 c
->configfile
= NULL
;
222 if (c
->error_string
) {
223 free(c
->error_string
);
224 c
->error_string
= NULL
;
227 lxc_putlock(c
->slock
);
231 lxc_putlock(c
->privlock
);
239 lxc_conf_free(c
->lxc_conf
);
242 if (c
->config_path
) {
243 free(c
->config_path
);
244 c
->config_path
= NULL
;
251 * Consider the following case:
252 freer | racing get()er
253 ==================================================================
254 lxc_container_put() | lxc_container_get()
255 \ lxclock(c->privlock) | c->numthreads < 1? (no)
256 \ c->numthreads = 0 | \ lxclock(c->privlock) -> waits
258 \ lxc_container_free() | \ lxclock() returns
259 | \ c->numthreads < 1 -> return 0
261 \ \ sem_destroy(privlock) |
263 * When the get()er checks numthreads the first time, one of the following
265 * 1. freer has set numthreads = 0. get() returns 0
266 * 2. freer is between lxclock and setting numthreads to 0. get()er will
267 * sem_wait on privlock, get lxclock after freer() drops it, then see
268 * numthreads is 0 and exit without touching lxclock again..
269 * 3. freer has not yet locked privlock. If get()er runs first, then put()er
270 * will see --numthreads = 1 and not call lxc_container_free().
273 int lxc_container_get(struct lxc_container
*c
)
278 // if someone else has already started freeing the container, don't
279 // try to take the lock, which may be invalid
280 if (c
->numthreads
< 1)
283 if (container_mem_lock(c
))
285 if (c
->numthreads
< 1) {
286 // bail without trying to unlock, bc the privlock is now probably
291 container_mem_unlock(c
);
295 int lxc_container_put(struct lxc_container
*c
)
299 if (container_mem_lock(c
))
301 if (--c
->numthreads
< 1) {
302 container_mem_unlock(c
);
303 lxc_container_free(c
);
306 container_mem_unlock(c
);
310 static bool lxcapi_is_defined(struct lxc_container
*c
)
319 if (container_mem_lock(c
))
323 statret
= stat(c
->configfile
, &statbuf
);
329 container_mem_unlock(c
);
333 static const char *lxcapi_state(struct lxc_container
*c
)
339 s
= lxc_getstate(c
->name
, c
->config_path
);
340 return lxc_state2str(s
);
343 static bool is_stopped(struct lxc_container
*c
)
346 s
= lxc_getstate(c
->name
, c
->config_path
);
347 return (s
== STOPPED
);
350 static bool lxcapi_is_running(struct lxc_container
*c
)
357 if (!s
|| strcmp(s
, "STOPPED") == 0)
362 static bool lxcapi_freeze(struct lxc_container
*c
)
368 ret
= lxc_freeze(c
->name
, c
->config_path
);
374 static bool lxcapi_unfreeze(struct lxc_container
*c
)
380 ret
= lxc_unfreeze(c
->name
, c
->config_path
);
386 static int lxcapi_console_getfd(struct lxc_container
*c
, int *ttynum
, int *masterfd
)
392 ttyfd
= lxc_console_getfd(c
, ttynum
, masterfd
);
396 static int lxcapi_console(struct lxc_container
*c
, int ttynum
, int stdinfd
,
397 int stdoutfd
, int stderrfd
, int escape
)
399 return lxc_console(c
, ttynum
, stdinfd
, stdoutfd
, stderrfd
, escape
);
402 static pid_t
lxcapi_init_pid(struct lxc_container
*c
)
407 return lxc_cmd_get_init_pid(c
->name
, c
->config_path
);
410 static bool load_config_locked(struct lxc_container
*c
, const char *fname
)
413 c
->lxc_conf
= lxc_conf_init();
416 if (lxc_config_read(fname
, c
->lxc_conf
, false) != 0)
418 if (!clone_update_unexp_network(c
->lxc_conf
))
423 static bool lxcapi_load_config(struct lxc_container
*c
, const char *alt_file
)
425 bool ret
= false, need_disklock
= false;
431 fname
= c
->configfile
;
437 * If we're reading something other than the container's config,
438 * we only need to lock the in-memory container. If loading the
439 * container's config file, take the disk lock.
441 if (strcmp(fname
, c
->configfile
) == 0)
442 need_disklock
= true;
445 lret
= container_disk_lock(c
);
447 lret
= container_mem_lock(c
);
451 ret
= load_config_locked(c
, fname
);
454 container_disk_unlock(c
);
456 container_mem_unlock(c
);
460 static bool lxcapi_want_daemonize(struct lxc_container
*c
, bool state
)
462 if (!c
|| !c
->lxc_conf
)
464 if (container_mem_lock(c
)) {
465 ERROR("Error getting mem lock");
468 c
->daemonize
= state
;
469 /* daemonize implies close_all_fds so set it */
471 c
->lxc_conf
->close_all_fds
= 1;
472 container_mem_unlock(c
);
476 static bool lxcapi_want_close_all_fds(struct lxc_container
*c
, bool state
)
478 if (!c
|| !c
->lxc_conf
)
480 if (container_mem_lock(c
)) {
481 ERROR("Error getting mem lock");
484 c
->lxc_conf
->close_all_fds
= state
;
485 container_mem_unlock(c
);
489 static bool lxcapi_wait(struct lxc_container
*c
, const char *state
, int timeout
)
496 ret
= lxc_wait(c
->name
, state
, timeout
, c
->config_path
);
501 static bool wait_on_daemonized_start(struct lxc_container
*c
, int pid
)
503 /* we'll probably want to make this timeout configurable? */
504 int timeout
= 5, ret
, status
;
507 * our child is going to fork again, then exit. reap the
510 ret
= waitpid(pid
, &status
, 0);
511 if (ret
== -1 || !WIFEXITED(status
) || WEXITSTATUS(status
) != 0)
512 DEBUG("failed waiting for first dual-fork child");
513 return lxcapi_wait(c
, "RUNNING", timeout
);
516 static bool am_single_threaded(void)
518 struct dirent dirent
, *direntp
;
522 dir
= opendir("/proc/self/task");
524 INFO("failed to open /proc/self/task");
528 while (!readdir_r(dir
, &dirent
, &direntp
)) {
532 if (!strcmp(direntp
->d_name
, "."))
535 if (!strcmp(direntp
->d_name
, ".."))
545 * I can't decide if it'd be more convenient for callers if we accept '...',
546 * or a null-terminated array (i.e. execl vs execv)
548 static bool lxcapi_start(struct lxc_container
*c
, int useinit
, char * const argv
[])
551 struct lxc_conf
*conf
;
552 bool daemonize
= false;
554 char *default_args
[] = {
559 /* container exists */
562 /* container has been setup */
566 if ((ret
= ongoing_create(c
)) < 0) {
567 ERROR("Error checking for incomplete creation");
571 ERROR("Error: %s creation was not completed", c
->name
);
574 } else if (ret
== 1) {
575 ERROR("Error: creation of %s is ongoing", c
->name
);
579 /* is this app meant to be run through lxcinit, as in lxc-execute? */
580 if (useinit
&& !argv
)
583 if (container_mem_lock(c
))
586 daemonize
= c
->daemonize
;
587 container_mem_unlock(c
);
590 ret
= lxc_execute(c
->name
, argv
, 1, conf
, c
->config_path
);
591 return ret
== 0 ? true : false;
598 * say, I'm not sure - what locks do we want here? Any?
599 * Is liblxc's locking enough here to protect the on disk
600 * container? We don't want to exclude things like lxc_info
601 * while container is running...
604 lxc_monitord_spawn(c
->config_path
);
611 /* Set to NULL because we don't want father unlink
612 * the PID file, child will do the free and unlink.
615 return wait_on_daemonized_start(c
, pid
);
618 /* second fork to be reparented by init */
621 SYSERROR("Error doing dual-fork");
626 /* like daemon(), chdir to / and redirect 0,1,2 to /dev/null */
628 SYSERROR("Error chdir()ing to /.");
631 lxc_check_inherited(conf
, -1);
635 open("/dev/zero", O_RDONLY
);
636 open("/dev/null", O_RDWR
);
637 open("/dev/null", O_RDWR
);
640 if (!am_single_threaded()) {
641 ERROR("Cannot start non-daemonized container when threaded");
646 /* We need to write PID file after daeminize, so we always
647 * write the right PID.
650 pid_fp
= fopen(c
->pidfile
, "w");
651 if (pid_fp
== NULL
) {
652 SYSERROR("Failed to create pidfile '%s' for '%s'",
653 c
->pidfile
, c
->name
);
657 if (fprintf(pid_fp
, "%d\n", getpid()) < 0) {
658 SYSERROR("Failed to write '%s'", c
->pidfile
);
670 ret
= lxc_start(c
->name
, argv
, conf
, c
->config_path
);
674 INFO("container requested reboot");
686 exit (ret
== 0 ? true : false);
688 return (ret
== 0 ? true : false);
692 * note there MUST be an ending NULL
694 static bool lxcapi_startl(struct lxc_container
*c
, int useinit
, ...)
697 char **inargs
= NULL
;
700 /* container exists */
704 va_start(ap
, useinit
);
705 inargs
= lxc_va_arg_list_to_argv(ap
, 0, 1);
709 ERROR("Memory allocation error.");
713 /* pass NULL if no arguments were supplied */
714 bret
= lxcapi_start(c
, useinit
, *inargs
? inargs
: NULL
);
719 for (arg
= inargs
; *arg
; arg
++)
727 static bool lxcapi_stop(struct lxc_container
*c
)
734 ret
= lxc_cmd_stop(c
->name
, c
->config_path
);
739 static int do_create_container_dir(const char *path
, struct lxc_conf
*conf
)
741 int ret
= -1, lasterr
;
742 char *p
= alloca(strlen(path
)+1);
743 mode_t mask
= umask(0002);
744 ret
= mkdir(path
, 0770);
752 SYSERROR("failed to create container path %s", path
);
757 if (!lxc_list_empty(&conf
->id_map
) && chown_mapped_root(p
, conf
) != 0) {
758 ERROR("Failed to chown container dir");
765 * create the standard expected container dir
767 static bool create_container_dir(struct lxc_container
*c
)
772 len
= strlen(c
->config_path
) + strlen(c
->name
) + 2;
776 ret
= snprintf(s
, len
, "%s/%s", c
->config_path
, c
->name
);
777 if (ret
< 0 || ret
>= len
) {
781 ret
= do_create_container_dir(s
, c
->lxc_conf
);
786 static const char *lxcapi_get_config_path(struct lxc_container
*c
);
787 static bool lxcapi_set_config_item(struct lxc_container
*c
, const char *key
, const char *v
);
790 * do_bdev_create: thin wrapper around bdev_create(). Like bdev_create(),
791 * it returns a mounted bdev on success, NULL on error.
793 static struct bdev
*do_bdev_create(struct lxc_container
*c
, const char *type
,
794 struct bdev_specs
*specs
)
801 /* rootfs.path or lxcpath/lxcname/rootfs */
802 if (c
->lxc_conf
->rootfs
.path
&& access(c
->lxc_conf
->rootfs
.path
, F_OK
) == 0) {
803 const char *rpath
= c
->lxc_conf
->rootfs
.path
;
804 len
= strlen(rpath
) + 1;
806 ret
= snprintf(dest
, len
, "%s", rpath
);
808 const char *lxcpath
= lxcapi_get_config_path(c
);
809 len
= strlen(c
->name
) + strlen(lxcpath
) + 9;
811 ret
= snprintf(dest
, len
, "%s/%s/rootfs", lxcpath
, c
->name
);
813 if (ret
< 0 || ret
>= len
)
816 bdev
= bdev_create(dest
, type
, c
->name
, specs
);
818 ERROR("Failed to create backing store type %s", type
);
822 lxcapi_set_config_item(c
, "lxc.rootfs", bdev
->src
);
824 /* if we are not root, chown the rootfs dir to root in the
827 if (geteuid() != 0 || (c
->lxc_conf
&& !lxc_list_empty(&c
->lxc_conf
->id_map
))) {
828 if (chown_mapped_root(bdev
->dest
, c
->lxc_conf
) < 0) {
829 ERROR("Error chowning %s to container root", bdev
->dest
);
830 suggest_default_idmap();
840 * Given the '-t' template option to lxc-create, figure out what to
841 * do. If the template is a full executable path, use that. If it
842 * is something like 'sshd', then return $templatepath/lxc-sshd.
843 * On success return the template, on error return NULL.
845 static char *get_template_path(const char *t
)
850 if (t
[0] == '/' && access(t
, X_OK
) == 0) {
855 len
= strlen(LXCTEMPLATEDIR
) + strlen(t
) + strlen("/lxc-") + 1;
859 ret
= snprintf(tpath
, len
, "%s/lxc-%s", LXCTEMPLATEDIR
, t
);
860 if (ret
< 0 || ret
>= len
) {
864 if (access(tpath
, X_OK
) < 0) {
865 SYSERROR("bad template: %s", t
);
873 static char *lxcbasename(char *path
)
875 char *p
= path
+ strlen(path
) - 1;
876 while (*p
!= '/' && p
> path
)
881 static bool create_run_template(struct lxc_container
*c
, char *tpath
, bool quiet
,
891 SYSERROR("failed to fork task for container creation template");
895 if (pid
== 0) { // child
896 char *patharg
, *namearg
, *rootfsarg
, *src
;
897 struct bdev
*bdev
= NULL
;
899 int ret
, len
, nargs
= 0;
901 struct lxc_conf
*conf
= c
->lxc_conf
;
907 open("/dev/zero", O_RDONLY
);
908 open("/dev/null", O_RDWR
);
909 open("/dev/null", O_RDWR
);
912 src
= c
->lxc_conf
->rootfs
.path
;
914 * for an overlay create, what the user wants is the template to fill
915 * in what will become the readonly lower layer. So don't mount for
918 if (strncmp(src
, "overlayfs:", 10) == 0)
919 src
= overlay_getlower(src
+10);
920 if (strncmp(src
, "aufs:", 5) == 0)
921 src
= overlay_getlower(src
+5);
923 bdev
= bdev_init(c
->lxc_conf
, src
, c
->lxc_conf
->rootfs
.mount
, NULL
);
925 ERROR("Error opening rootfs");
929 if (geteuid() == 0) {
930 if (unshare(CLONE_NEWNS
) < 0) {
931 ERROR("error unsharing mounts");
934 if (detect_shared_rootfs()) {
935 if (mount(NULL
, "/", NULL
, MS_SLAVE
|MS_REC
, NULL
)) {
936 SYSERROR("Failed to make / rslave to run template");
937 ERROR("Continuing...");
941 if (strcmp(bdev
->type
, "dir") && strcmp(bdev
->type
, "btrfs")) {
942 if (geteuid() != 0) {
943 ERROR("non-root users can only create btrfs and directory-backed containers");
946 if (bdev
->ops
->mount(bdev
) < 0) {
947 ERROR("Error mounting rootfs");
950 } else { // TODO come up with a better way here!
953 bdev
->dest
= strdup(bdev
->src
);
957 * create our new array, pre-pend the template name and
961 for (nargs
= 0; argv
[nargs
]; nargs
++) ;
962 nargs
+= 4; // template, path, rootfs and name args
964 newargv
= malloc(nargs
* sizeof(*newargv
));
967 newargv
[0] = lxcbasename(tpath
);
969 len
= strlen(c
->config_path
) + strlen(c
->name
) + strlen("--path=") + 2;
970 patharg
= malloc(len
);
973 ret
= snprintf(patharg
, len
, "--path=%s/%s", c
->config_path
, c
->name
);
974 if (ret
< 0 || ret
>= len
)
976 newargv
[1] = patharg
;
977 len
= strlen("--name=") + strlen(c
->name
) + 1;
978 namearg
= malloc(len
);
981 ret
= snprintf(namearg
, len
, "--name=%s", c
->name
);
982 if (ret
< 0 || ret
>= len
)
984 newargv
[2] = namearg
;
986 len
= strlen("--rootfs=") + 1 + strlen(bdev
->dest
);
987 rootfsarg
= malloc(len
);
990 ret
= snprintf(rootfsarg
, len
, "--rootfs=%s", bdev
->dest
);
991 if (ret
< 0 || ret
>= len
)
993 newargv
[3] = rootfsarg
;
995 /* add passed-in args */
997 for (i
= 4; i
< nargs
; i
++)
998 newargv
[i
] = argv
[i
-4];
1000 /* add trailing NULL */
1002 newargv
= realloc(newargv
, nargs
* sizeof(*newargv
));
1005 newargv
[nargs
- 1] = NULL
;
1008 * If we're running the template in a mapped userns, then
1009 * we prepend the template command with:
1010 * lxc-usernsexec <-m map1> ... <-m mapn> --
1011 * and we append "--mapped-uid x", where x is the mapped uid
1014 if (!lxc_list_empty(&conf
->id_map
)) {
1018 char **n2
= malloc(n2args
* sizeof(*n2
));
1019 struct lxc_list
*it
;
1023 SYSERROR("out of memory");
1027 tpath
= "lxc-usernsexec";
1028 n2
[0] = "lxc-usernsexec";
1029 lxc_list_for_each(it
, &conf
->id_map
) {
1032 n2
= realloc(n2
, n2args
* sizeof(char *));
1035 n2
[n2args
-2] = "-m";
1036 n2
[n2args
-1] = malloc(200);
1039 ret
= snprintf(n2
[n2args
-1], 200, "%c:%lu:%lu:%lu",
1040 map
->idtype
== ID_TYPE_UID
? 'u' : 'g',
1041 map
->nsid
, map
->hostid
, map
->range
);
1042 if (ret
< 0 || ret
>= 200)
1045 int hostid_mapped
= mapped_hostid(geteuid(), conf
, ID_TYPE_UID
);
1046 int extraargs
= hostid_mapped
>= 0 ? 1 : 3;
1047 n2
= realloc(n2
, (nargs
+ n2args
+ extraargs
) * sizeof(char *));
1050 if (hostid_mapped
< 0) {
1051 hostid_mapped
= find_unmapped_nsuid(conf
, ID_TYPE_UID
);
1052 n2
[n2args
++] = "-m";
1053 if (hostid_mapped
< 0) {
1054 ERROR("Could not find free uid to map");
1057 n2
[n2args
++] = malloc(200);
1058 if (!n2
[n2args
-1]) {
1059 SYSERROR("out of memory");
1062 ret
= snprintf(n2
[n2args
-1], 200, "u:%d:%d:1",
1063 hostid_mapped
, geteuid());
1064 if (ret
< 0 || ret
>= 200) {
1065 ERROR("string too long");
1069 int hostgid_mapped
= mapped_hostid(getegid(), conf
, ID_TYPE_GID
);
1070 extraargs
= hostgid_mapped
>= 0 ? 1 : 3;
1071 n2
= realloc(n2
, (nargs
+ n2args
+ extraargs
) * sizeof(char *));
1074 if (hostgid_mapped
< 0) {
1075 hostgid_mapped
= find_unmapped_nsuid(conf
, ID_TYPE_GID
);
1076 n2
[n2args
++] = "-m";
1077 if (hostgid_mapped
< 0) {
1078 ERROR("Could not find free uid to map");
1081 n2
[n2args
++] = malloc(200);
1082 if (!n2
[n2args
-1]) {
1083 SYSERROR("out of memory");
1086 ret
= snprintf(n2
[n2args
-1], 200, "g:%d:%d:1",
1087 hostgid_mapped
, getegid());
1088 if (ret
< 0 || ret
>= 200) {
1089 ERROR("string too long");
1093 n2
[n2args
++] = "--";
1094 for (i
= 0; i
< nargs
; i
++)
1095 n2
[i
+ n2args
] = newargv
[i
];
1097 // Finally add "--mapped-uid $uid" to tell template what to chown
1100 n2
= realloc(n2
, n2args
* sizeof(char *));
1102 SYSERROR("out of memory");
1105 // note n2[n2args-1] is NULL
1106 n2
[n2args
-5] = "--mapped-uid";
1107 snprintf(txtuid
, 20, "%d", hostid_mapped
);
1108 n2
[n2args
-4] = txtuid
;
1109 n2
[n2args
-3] = "--mapped-gid";
1110 snprintf(txtgid
, 20, "%d", hostgid_mapped
);
1111 n2
[n2args
-2] = txtgid
;
1112 n2
[n2args
-1] = NULL
;
1117 execvp(tpath
, newargv
);
1118 SYSERROR("failed to execute template %s", tpath
);
1122 if (wait_for_pid(pid
) != 0) {
1123 ERROR("container creation template for %s failed", c
->name
);
1130 static bool prepend_lxc_header(char *path
, const char *t
, char *const argv
[])
1138 unsigned char md_value
[SHA_DIGEST_LENGTH
];
1142 f
= fopen(path
, "r");
1146 if (fseek(f
, 0, SEEK_END
) < 0)
1148 if ((flen
= ftell(f
)) < 0)
1150 if (fseek(f
, 0, SEEK_SET
) < 0)
1152 if ((contents
= malloc(flen
+ 1)) == NULL
)
1154 if (fread(contents
, 1, flen
, f
) != flen
)
1155 goto out_free_contents
;
1157 contents
[flen
] = '\0';
1161 goto out_free_contents
;
1164 tpath
= get_template_path(t
);
1166 ERROR("bad template: %s", t
);
1167 goto out_free_contents
;
1170 ret
= sha1sum_file(tpath
, md_value
);
1172 ERROR("Error getting sha1sum of %s", tpath
);
1174 goto out_free_contents
;
1179 f
= fopen(path
, "w");
1181 SYSERROR("reopening config for writing");
1185 fprintf(f
, "# Template used to create this container: %s\n", t
);
1187 fprintf(f
, "# Parameters passed to the template:");
1189 fprintf(f
, " %s", *argv
);
1195 fprintf(f
, "# Template script checksum (SHA-1): ");
1196 for (i
=0; i
<SHA_DIGEST_LENGTH
; i
++)
1197 fprintf(f
, "%02x", md_value
[i
]);
1200 fprintf(f
, "# For additional config options, please look at lxc.container.conf(5)\n");
1201 if (fwrite(contents
, 1, flen
, f
) != flen
) {
1202 SYSERROR("Writing original contents");
1218 SYSERROR("Error prepending header");
1224 static void lxcapi_clear_config(struct lxc_container
*c
)
1228 lxc_conf_free(c
->lxc_conf
);
1234 static bool lxcapi_destroy(struct lxc_container
*c
);
1235 static bool container_destroy(struct lxc_container
*c
);
1236 static bool get_snappath_dir(struct lxc_container
*c
, char *snappath
);
1239 * create a container with the given parameters.
1240 * @c: container to be created. It has the lxcpath, name, and a starting
1241 * configuration already set
1242 * @t: the template to execute to instantiate the root filesystem and
1243 * adjust the configuration.
1244 * @bdevtype: backing store type to use. If NULL, dir will be used.
1245 * @specs: additional parameters for the backing store, i.e. LVM vg to
1248 * @argv: the arguments to pass to the template, terminated by NULL. If no
1249 * arguments, you can just pass NULL.
1251 static bool lxcapi_create(struct lxc_container
*c
, const char *t
,
1252 const char *bdevtype
, struct bdev_specs
*specs
, int flags
,
1264 tpath
= get_template_path(t
);
1266 ERROR("bad template: %s", t
);
1272 * If a template is passed in, and the rootfs already is defined in
1273 * the container config and exists, then * caller is trying to create
1274 * an existing container. Return an error, but do NOT delete the
1277 if (lxcapi_is_defined(c
) && c
->lxc_conf
&& c
->lxc_conf
->rootfs
.path
&&
1278 access(c
->lxc_conf
->rootfs
.path
, F_OK
) == 0 && tpath
) {
1279 ERROR("Container %s:%s already exists", c
->config_path
, c
->name
);
1284 if (!c
->load_config(c
, lxc_global_config_value("lxc.default_config"))) {
1285 ERROR("Error loading default configuration file %s", lxc_global_config_value("lxc.default_config"));
1290 if (!create_container_dir(c
))
1294 * either template or rootfs.path should be set.
1295 * if both template and rootfs.path are set, template is setup as rootfs.path.
1296 * container is already created if we have a config and rootfs.path is accessible
1298 if (!c
->lxc_conf
->rootfs
.path
&& !tpath
)
1299 /* no template passed in and rootfs does not exist: error */
1301 if (c
->lxc_conf
->rootfs
.path
&& access(c
->lxc_conf
->rootfs
.path
, F_OK
) != 0)
1302 /* rootfs passed into configuration, but does not exist: error */
1304 if (lxcapi_is_defined(c
) && c
->lxc_conf
->rootfs
.path
&& !tpath
) {
1305 /* Rootfs already existed, user just wanted to save the
1306 * loaded configuration */
1311 /* Mark that this container is being created */
1312 if ((partial_fd
= create_partial(c
)) < 0)
1315 /* no need to get disk lock bc we have the partial locked */
1318 * Create the backing store
1319 * Note we can't do this in the same task as we use to execute the
1320 * template because of the way zfs works.
1321 * After you 'zfs create', zfs mounts the fs only in the initial
1326 SYSERROR("failed to fork task for container creation template");
1330 if (pid
== 0) { // child
1331 struct bdev
*bdev
= NULL
;
1333 if (!(bdev
= do_bdev_create(c
, bdevtype
, specs
))) {
1334 ERROR("Error creating backing store type %s for %s",
1335 bdevtype
? bdevtype
: "(none)", c
->name
);
1339 /* save config file again to store the new rootfs location */
1340 if (!c
->save_config(c
, NULL
)) {
1341 ERROR("failed to save starting configuration for %s", c
->name
);
1342 // parent task won't see bdev in config so we delete it
1343 bdev
->ops
->umount(bdev
);
1344 bdev
->ops
->destroy(bdev
);
1349 if (wait_for_pid(pid
) != 0)
1352 /* reload config to get the rootfs */
1353 lxc_conf_free(c
->lxc_conf
);
1355 if (!load_config_locked(c
, c
->configfile
))
1358 if (!create_run_template(c
, tpath
, !!(flags
& LXC_CREATE_QUIET
), argv
))
1361 // now clear out the lxc_conf we have, reload from the created
1363 lxcapi_clear_config(c
);
1366 if (!prepend_lxc_header(c
->configfile
, tpath
, argv
)) {
1367 ERROR("Error prepending header to configuration file");
1371 ret
= load_config_locked(c
, c
->configfile
);
1374 if (partial_fd
>= 0)
1375 remove_partial(c
, partial_fd
);
1378 container_destroy(c
);
1385 static bool lxcapi_reboot(struct lxc_container
*c
)
1391 if (!c
->is_running(c
))
1393 pid
= c
->init_pid(c
);
1396 if (kill(pid
, SIGINT
) < 0)
1402 static bool lxcapi_shutdown(struct lxc_container
*c
, int timeout
)
1406 int haltsignal
= SIGPWR
;
1411 if (!c
->is_running(c
))
1413 pid
= c
->init_pid(c
);
1416 if (c
->lxc_conf
&& c
->lxc_conf
->haltsignal
)
1417 haltsignal
= c
->lxc_conf
->haltsignal
;
1418 kill(pid
, haltsignal
);
1419 retv
= c
->wait(c
, "STOPPED", timeout
);
1423 static bool lxcapi_createl(struct lxc_container
*c
, const char *t
,
1424 const char *bdevtype
, struct bdev_specs
*specs
, int flags
, ...)
1434 * since we're going to wait for create to finish, I don't think we
1435 * need to get a copy of the arguments.
1437 va_start(ap
, flags
);
1438 args
= lxc_va_arg_list_to_argv(ap
, 0, 0);
1441 ERROR("Memory allocation error.");
1445 bret
= c
->create(c
, t
, bdevtype
, specs
, flags
, args
);
1452 static void do_clear_unexp_config_line(struct lxc_conf
*conf
, const char *key
)
1454 if (strcmp(key
, "lxc.cgroup") == 0)
1455 clear_unexp_config_line(conf
, key
, true);
1456 else if (strcmp(key
, "lxc.network") == 0)
1457 clear_unexp_config_line(conf
, key
, true);
1458 else if (strcmp(key
, "lxc.hook") == 0)
1459 clear_unexp_config_line(conf
, key
, true);
1461 clear_unexp_config_line(conf
, key
, false);
1462 if (!do_append_unexp_config_line(conf
, key
, ""))
1463 WARN("Error clearing configuration for %s", key
);
1466 static bool lxcapi_clear_config_item(struct lxc_container
*c
, const char *key
)
1470 if (!c
|| !c
->lxc_conf
)
1472 if (container_mem_lock(c
))
1474 ret
= lxc_clear_config_item(c
->lxc_conf
, key
);
1476 do_clear_unexp_config_line(c
->lxc_conf
, key
);
1477 container_mem_unlock(c
);
1481 static inline bool enter_to_ns(struct lxc_container
*c
) {
1482 int netns
, userns
, ret
= 0, init_pid
= 0;;
1483 char new_netns_path
[MAXPATHLEN
];
1484 char new_userns_path
[MAXPATHLEN
];
1486 if (!c
->is_running(c
))
1489 init_pid
= c
->init_pid(c
);
1491 /* Switch to new userns */
1492 if ((geteuid() != 0 || (c
->lxc_conf
&& !lxc_list_empty(&c
->lxc_conf
->id_map
))) && access("/proc/self/ns/user", F_OK
) == 0) {
1493 ret
= snprintf(new_userns_path
, MAXPATHLEN
, "/proc/%d/ns/user", init_pid
);
1494 if (ret
< 0 || ret
>= MAXPATHLEN
)
1497 userns
= open(new_userns_path
, O_RDONLY
);
1499 SYSERROR("failed to open %s", new_userns_path
);
1503 if (setns(userns
, CLONE_NEWUSER
)) {
1504 SYSERROR("failed to setns for CLONE_NEWUSER");
1511 /* Switch to new netns */
1512 ret
= snprintf(new_netns_path
, MAXPATHLEN
, "/proc/%d/ns/net", init_pid
);
1513 if (ret
< 0 || ret
>= MAXPATHLEN
)
1516 netns
= open(new_netns_path
, O_RDONLY
);
1518 SYSERROR("failed to open %s", new_netns_path
);
1522 if (setns(netns
, CLONE_NEWNET
)) {
1523 SYSERROR("failed to setns for CLONE_NEWNET");
1533 // used by qsort and bsearch functions for comparing names
1534 static inline int string_cmp(char **first
, char **second
)
1536 return strcmp(*first
, *second
);
1539 // used by qsort and bsearch functions for comparing container names
1540 static inline int container_cmp(struct lxc_container
**first
, struct lxc_container
**second
)
1542 return strcmp((*first
)->name
, (*second
)->name
);
1545 static bool add_to_array(char ***names
, char *cname
, int pos
)
1547 char **newnames
= realloc(*names
, (pos
+1) * sizeof(char *));
1549 ERROR("Out of memory");
1554 newnames
[pos
] = strdup(cname
);
1558 // sort the arrray as we will use binary search on it
1559 qsort(newnames
, pos
+ 1, sizeof(char *), (int (*)(const void *,const void *))string_cmp
);
1564 static bool add_to_clist(struct lxc_container
***list
, struct lxc_container
*c
, int pos
, bool sort
)
1566 struct lxc_container
**newlist
= realloc(*list
, (pos
+1) * sizeof(struct lxc_container
*));
1568 ERROR("Out of memory");
1575 // sort the arrray as we will use binary search on it
1577 qsort(newlist
, pos
+ 1, sizeof(struct lxc_container
*), (int (*)(const void *,const void *))container_cmp
);
1582 static char** get_from_array(char ***names
, char *cname
, int size
)
1584 return (char **)bsearch(&cname
, *names
, size
, sizeof(char *), (int (*)(const void *, const void *))string_cmp
);
1588 static bool array_contains(char ***names
, char *cname
, int size
) {
1589 if(get_from_array(names
, cname
, size
) != NULL
)
1594 static bool remove_from_array(char ***names
, char *cname
, int size
)
1596 char **result
= get_from_array(names
, cname
, size
);
1597 if (result
!= NULL
) {
1604 static char** lxcapi_get_interfaces(struct lxc_container
*c
)
1607 int i
, count
= 0, pipefd
[2];
1608 char **interfaces
= NULL
;
1609 char interface
[IFNAMSIZ
];
1611 if(pipe(pipefd
) < 0) {
1612 SYSERROR("pipe failed");
1618 SYSERROR("failed to fork task to get interfaces information");
1624 if (pid
== 0) { // child
1625 int ret
= 1, nbytes
;
1626 struct ifaddrs
*interfaceArray
= NULL
, *tempIfAddr
= NULL
;
1628 /* close the read-end of the pipe */
1631 if (!enter_to_ns(c
)) {
1632 SYSERROR("failed to enter namespace");
1636 /* Grab the list of interfaces */
1637 if (getifaddrs(&interfaceArray
)) {
1638 SYSERROR("failed to get interfaces list");
1642 /* Iterate through the interfaces */
1643 for (tempIfAddr
= interfaceArray
; tempIfAddr
!= NULL
; tempIfAddr
= tempIfAddr
->ifa_next
) {
1644 nbytes
= write(pipefd
[1], tempIfAddr
->ifa_name
, IFNAMSIZ
);
1646 ERROR("write failed");
1655 freeifaddrs(interfaceArray
);
1657 /* close the write-end of the pipe, thus sending EOF to the reader */
1662 /* close the write-end of the pipe */
1665 while (read(pipefd
[0], &interface
, IFNAMSIZ
) == IFNAMSIZ
) {
1666 if (array_contains(&interfaces
, interface
, count
))
1669 if(!add_to_array(&interfaces
, interface
, count
))
1670 ERROR("PARENT: add_to_array failed");
1674 if (wait_for_pid(pid
) != 0) {
1675 for(i
=0;i
<count
;i
++)
1676 free(interfaces
[i
]);
1681 /* close the read-end of the pipe */
1684 /* Append NULL to the array */
1686 interfaces
= (char **)lxc_append_null_to_array((void **)interfaces
, count
);
1691 static char** lxcapi_get_ips(struct lxc_container
*c
, const char* interface
, const char* family
, int scope
)
1694 int i
, count
= 0, pipefd
[2];
1695 char **addresses
= NULL
;
1696 char address
[INET6_ADDRSTRLEN
];
1698 if(pipe(pipefd
) < 0) {
1699 SYSERROR("pipe failed");
1705 SYSERROR("failed to fork task to get container ips");
1711 if (pid
== 0) { // child
1712 int ret
= 1, nbytes
;
1713 struct ifaddrs
*interfaceArray
= NULL
, *tempIfAddr
= NULL
;
1714 char addressOutputBuffer
[INET6_ADDRSTRLEN
];
1715 void *tempAddrPtr
= NULL
;
1716 char *address
= NULL
;
1718 /* close the read-end of the pipe */
1721 if (!enter_to_ns(c
)) {
1722 SYSERROR("failed to enter namespace");
1726 /* Grab the list of interfaces */
1727 if (getifaddrs(&interfaceArray
)) {
1728 SYSERROR("failed to get interfaces list");
1732 /* Iterate through the interfaces */
1733 for (tempIfAddr
= interfaceArray
; tempIfAddr
!= NULL
; tempIfAddr
= tempIfAddr
->ifa_next
) {
1734 if (tempIfAddr
->ifa_addr
== NULL
)
1737 if(tempIfAddr
->ifa_addr
->sa_family
== AF_INET
) {
1738 if (family
&& strcmp(family
, "inet"))
1740 tempAddrPtr
= &((struct sockaddr_in
*)tempIfAddr
->ifa_addr
)->sin_addr
;
1743 if (family
&& strcmp(family
, "inet6"))
1746 if (((struct sockaddr_in6
*)tempIfAddr
->ifa_addr
)->sin6_scope_id
!= scope
)
1749 tempAddrPtr
= &((struct sockaddr_in6
*)tempIfAddr
->ifa_addr
)->sin6_addr
;
1752 if (interface
&& strcmp(interface
, tempIfAddr
->ifa_name
))
1754 else if (!interface
&& strcmp("lo", tempIfAddr
->ifa_name
) == 0)
1757 address
= (char *)inet_ntop(tempIfAddr
->ifa_addr
->sa_family
,
1759 addressOutputBuffer
,
1760 sizeof(addressOutputBuffer
));
1764 nbytes
= write(pipefd
[1], address
, INET6_ADDRSTRLEN
);
1766 ERROR("write failed");
1775 freeifaddrs(interfaceArray
);
1777 /* close the write-end of the pipe, thus sending EOF to the reader */
1782 /* close the write-end of the pipe */
1785 while (read(pipefd
[0], &address
, INET6_ADDRSTRLEN
) == INET6_ADDRSTRLEN
) {
1786 if(!add_to_array(&addresses
, address
, count
))
1787 ERROR("PARENT: add_to_array failed");
1791 if (wait_for_pid(pid
) != 0) {
1792 for(i
=0;i
<count
;i
++)
1798 /* close the read-end of the pipe */
1801 /* Append NULL to the array */
1803 addresses
= (char **)lxc_append_null_to_array((void **)addresses
, count
);
1808 static int lxcapi_get_config_item(struct lxc_container
*c
, const char *key
, char *retv
, int inlen
)
1812 if (!c
|| !c
->lxc_conf
)
1814 if (container_mem_lock(c
))
1816 ret
= lxc_get_config_item(c
->lxc_conf
, key
, retv
, inlen
);
1817 container_mem_unlock(c
);
1821 static char* lxcapi_get_running_config_item(struct lxc_container
*c
, const char *key
)
1825 if (!c
|| !c
->lxc_conf
)
1827 if (container_mem_lock(c
))
1829 ret
= lxc_cmd_get_config_item(c
->name
, key
, c
->get_config_path(c
));
1830 container_mem_unlock(c
);
1834 static int lxcapi_get_keys(struct lxc_container
*c
, const char *key
, char *retv
, int inlen
)
1837 return lxc_listconfigs(retv
, inlen
);
1839 * Support 'lxc.network.<idx>', i.e. 'lxc.network.0'
1840 * This is an intelligent result to show which keys are valid given
1841 * the type of nic it is
1843 if (!c
|| !c
->lxc_conf
)
1845 if (container_mem_lock(c
))
1848 if (strncmp(key
, "lxc.network.", 12) == 0)
1849 ret
= lxc_list_nicconfigs(c
->lxc_conf
, key
, retv
, inlen
);
1850 container_mem_unlock(c
);
1854 static bool lxcapi_save_config(struct lxc_container
*c
, const char *alt_file
)
1857 bool ret
= false, need_disklock
= false;
1861 alt_file
= c
->configfile
;
1863 return false; // should we write to stdout if no file is specified?
1865 // If we haven't yet loaded a config, load the stock config
1867 if (!c
->load_config(c
, lxc_global_config_value("lxc.default_config"))) {
1868 ERROR("Error loading default configuration file %s while saving %s", lxc_global_config_value("lxc.default_config"), c
->name
);
1873 if (!create_container_dir(c
))
1877 * If we're writing to the container's config file, take the
1878 * disk lock. Otherwise just take the memlock to protect the
1879 * struct lxc_container while we're traversing it.
1881 if (strcmp(c
->configfile
, alt_file
) == 0)
1882 need_disklock
= true;
1885 lret
= container_disk_lock(c
);
1887 lret
= container_mem_lock(c
);
1892 fout
= fopen(alt_file
, "w");
1895 write_config(fout
, c
->lxc_conf
);
1901 container_disk_unlock(c
);
1903 container_mem_unlock(c
);
1907 static bool mod_rdep(struct lxc_container
*c
, bool inc
)
1909 char path
[MAXPATHLEN
];
1914 if (container_disk_lock(c
))
1916 ret
= snprintf(path
, MAXPATHLEN
, "%s/%s/lxc_snapshots", c
->config_path
,
1918 if (ret
< 0 || ret
> MAXPATHLEN
)
1920 f
= fopen(path
, "r");
1922 ret
= fscanf(f
, "%d", &v
);
1925 ERROR("Corrupted file %s", path
);
1930 f
= fopen(path
, "w");
1933 if (fprintf(f
, "%d\n", v
) < 0) {
1934 ERROR("Error writing new snapshots value");
1940 SYSERROR("Error writing to or closing snapshots file");
1947 container_disk_unlock(c
);
1951 static void strip_newline(char *p
)
1953 size_t len
= strlen(p
);
1956 if (p
[len
-1] == '\n')
1960 static void mod_all_rdeps(struct lxc_container
*c
, bool inc
)
1962 struct lxc_container
*p
;
1963 char *lxcpath
= NULL
, *lxcname
= NULL
, path
[MAXPATHLEN
];
1964 size_t pathlen
= 0, namelen
= 0;
1968 ret
= snprintf(path
, MAXPATHLEN
, "%s/%s/lxc_rdepends",
1969 c
->config_path
, c
->name
);
1970 if (ret
< 0 || ret
>= MAXPATHLEN
) {
1971 ERROR("Path name too long");
1974 f
= fopen(path
, "r");
1977 while (getline(&lxcpath
, &pathlen
, f
) != -1) {
1978 if (getline(&lxcname
, &namelen
, f
) == -1) {
1979 ERROR("badly formatted file %s", path
);
1982 strip_newline(lxcpath
);
1983 strip_newline(lxcname
);
1984 if ((p
= lxc_container_new(lxcname
, lxcpath
)) == NULL
) {
1985 ERROR("Unable to find dependent container %s:%s",
1989 if (!mod_rdep(p
, inc
))
1990 ERROR("Failed to increase numsnapshots for %s:%s",
1992 lxc_container_put(p
);
1995 if (lxcpath
) free(lxcpath
);
1996 if (lxcname
) free(lxcname
);
2000 static bool has_fs_snapshots(struct lxc_container
*c
)
2002 char path
[MAXPATHLEN
];
2007 ret
= snprintf(path
, MAXPATHLEN
, "%s/%s/lxc_snapshots", c
->config_path
,
2009 if (ret
< 0 || ret
> MAXPATHLEN
)
2011 f
= fopen(path
, "r");
2014 ret
= fscanf(f
, "%d", &v
);
2024 static bool has_snapshots(struct lxc_container
*c
)
2026 char path
[MAXPATHLEN
];
2027 struct dirent dirent
, *direntp
;
2031 if (!get_snappath_dir(c
, path
))
2033 dir
= opendir(path
);
2036 while (!readdir_r(dir
, &dirent
, &direntp
)) {
2040 if (!strcmp(direntp
->d_name
, "."))
2043 if (!strcmp(direntp
->d_name
, ".."))
2052 static int lxc_rmdir_onedev_wrapper(void *data
)
2054 char *arg
= (char *) data
;
2055 return lxc_rmdir_onedev(arg
, "snaps");
2058 static int do_bdev_destroy(struct lxc_conf
*conf
)
2063 r
= bdev_init(conf
, conf
->rootfs
.path
, conf
->rootfs
.mount
, NULL
);
2067 if (r
->ops
->destroy(r
) < 0)
2073 static int bdev_destroy_wrapper(void *data
)
2075 struct lxc_conf
*conf
= data
;
2077 if (setgid(0) < 0) {
2078 ERROR("Failed to setgid to 0");
2081 if (setgroups(0, NULL
) < 0)
2082 WARN("Failed to clear groups");
2083 if (setuid(0) < 0) {
2084 ERROR("Failed to setuid to 0");
2087 return do_bdev_destroy(conf
);
2090 static bool container_destroy(struct lxc_container
*c
)
2095 if (!c
|| !lxcapi_is_defined(c
))
2098 if (container_disk_lock(c
))
2101 if (!is_stopped(c
)) {
2102 // we should queue some sort of error - in c->error_string?
2103 ERROR("container %s is not stopped", c
->name
);
2107 if (c
->lxc_conf
&& c
->lxc_conf
->rootfs
.path
&& c
->lxc_conf
->rootfs
.mount
) {
2109 ret
= userns_exec_1(c
->lxc_conf
, bdev_destroy_wrapper
, c
->lxc_conf
);
2111 ret
= do_bdev_destroy(c
->lxc_conf
);
2113 ERROR("Error destroying rootfs for %s", c
->name
);
2118 mod_all_rdeps(c
, false);
2120 const char *p1
= lxcapi_get_config_path(c
);
2121 char *path
= alloca(strlen(p1
) + strlen(c
->name
) + 2);
2122 sprintf(path
, "%s/%s", p1
, c
->name
);
2124 ret
= userns_exec_1(c
->lxc_conf
, lxc_rmdir_onedev_wrapper
, path
);
2126 ret
= lxc_rmdir_onedev(path
, "snaps");
2128 ERROR("Error destroying container directory for %s", c
->name
);
2134 container_disk_unlock(c
);
2138 static bool lxcapi_destroy(struct lxc_container
*c
)
2140 if (!c
|| !lxcapi_is_defined(c
))
2142 if (has_snapshots(c
)) {
2143 ERROR("Container %s has snapshots; not removing", c
->name
);
2147 if (has_fs_snapshots(c
)) {
2148 ERROR("container %s has snapshots on its rootfs", c
->name
);
2152 return container_destroy(c
);
2155 static bool lxcapi_snapshot_destroy_all(struct lxc_container
*c
);
2157 static bool lxcapi_destroy_with_snapshots(struct lxc_container
*c
)
2159 if (!c
|| !lxcapi_is_defined(c
))
2161 if (!lxcapi_snapshot_destroy_all(c
)) {
2162 ERROR("Error deleting all snapshots");
2165 return lxcapi_destroy(c
);
2168 static bool set_config_item_locked(struct lxc_container
*c
, const char *key
, const char *v
)
2170 struct lxc_config_t
*config
;
2173 c
->lxc_conf
= lxc_conf_init();
2176 config
= lxc_getconfig(key
);
2179 if (config
->cb(key
, v
, c
->lxc_conf
) != 0)
2181 return do_append_unexp_config_line(c
->lxc_conf
, key
, v
);
2184 static bool lxcapi_set_config_item(struct lxc_container
*c
, const char *key
, const char *v
)
2191 if (container_mem_lock(c
))
2194 b
= set_config_item_locked(c
, key
, v
);
2196 container_mem_unlock(c
);
2200 static char *lxcapi_config_file_name(struct lxc_container
*c
)
2202 if (!c
|| !c
->configfile
)
2204 return strdup(c
->configfile
);
2207 static const char *lxcapi_get_config_path(struct lxc_container
*c
)
2209 if (!c
|| !c
->config_path
)
2211 return (const char *)(c
->config_path
);
2216 * Just recalculate the c->configfile based on the
2217 * c->config_path, which must be set.
2218 * The lxc_container must be locked or not yet public.
2220 static bool set_config_filename(struct lxc_container
*c
)
2225 if (!c
->config_path
)
2228 /* $lxc_path + "/" + c->name + "/" + "config" + '\0' */
2229 len
= strlen(c
->config_path
) + strlen(c
->name
) + strlen("config") + 3;
2230 newpath
= malloc(len
);
2234 ret
= snprintf(newpath
, len
, "%s/%s/config", c
->config_path
, c
->name
);
2235 if (ret
< 0 || ret
>= len
) {
2236 fprintf(stderr
, "Error printing out config file name\n");
2242 free(c
->configfile
);
2243 c
->configfile
= newpath
;
2248 static bool lxcapi_set_config_path(struct lxc_container
*c
, const char *path
)
2252 char *oldpath
= NULL
;
2257 if (container_mem_lock(c
))
2262 ERROR("Out of memory setting new lxc path");
2268 oldpath
= c
->config_path
;
2271 /* Since we've changed the config path, we have to change the
2272 * config file name too */
2273 if (!set_config_filename(c
)) {
2274 ERROR("Out of memory setting new config filename");
2276 free(c
->config_path
);
2277 c
->config_path
= oldpath
;
2283 container_mem_unlock(c
);
2288 static bool lxcapi_set_cgroup_item(struct lxc_container
*c
, const char *subsys
, const char *value
)
2298 if (container_disk_lock(c
))
2301 ret
= lxc_cgroup_set(subsys
, value
, c
->name
, c
->config_path
);
2303 container_disk_unlock(c
);
2307 static int lxcapi_get_cgroup_item(struct lxc_container
*c
, const char *subsys
, char *retv
, int inlen
)
2317 if (container_disk_lock(c
))
2320 ret
= lxc_cgroup_get(subsys
, retv
, inlen
, c
->name
, c
->config_path
);
2322 container_disk_unlock(c
);
2326 const char *lxc_get_global_config_item(const char *key
)
2328 return lxc_global_config_value(key
);
2331 const char *lxc_get_version(void)
2336 static int copy_file(const char *old
, const char *new)
2343 if (file_exists(new)) {
2344 ERROR("copy destination %s exists", new);
2347 ret
= stat(old
, &sbuf
);
2349 INFO("Error stat'ing %s", old
);
2353 in
= open(old
, O_RDONLY
);
2355 SYSERROR("Error opening original file %s", old
);
2358 out
= open(new, O_CREAT
| O_EXCL
| O_WRONLY
, 0644);
2360 SYSERROR("Error opening new file %s", new);
2366 len
= read(in
, buf
, 8096);
2368 SYSERROR("Error reading old file %s", old
);
2373 ret
= write(out
, buf
, len
);
2374 if (ret
< len
) { // should we retry?
2375 SYSERROR("Error: write to new file %s was interrupted", new);
2382 // we set mode, but not owner/group
2383 ret
= chmod(new, sbuf
.st_mode
);
2385 SYSERROR("Error setting mode on %s", new);
2397 static int copyhooks(struct lxc_container
*oldc
, struct lxc_container
*c
)
2400 struct lxc_list
*it
;
2403 len
= strlen(oldc
->config_path
) + strlen(oldc
->name
) + 3;
2404 cpath
= alloca(len
);
2405 ret
= snprintf(cpath
, len
, "%s/%s/", oldc
->config_path
, oldc
->name
);
2406 if (ret
< 0 || ret
>= len
)
2409 for (i
=0; i
<NUM_LXC_HOOKS
; i
++) {
2410 lxc_list_for_each(it
, &c
->lxc_conf
->hooks
[i
]) {
2411 char *hookname
= it
->elem
;
2412 char *fname
= strrchr(hookname
, '/');
2413 char tmppath
[MAXPATHLEN
];
2414 if (!fname
) // relative path - we don't support, but maybe we should
2416 if (strncmp(hookname
, cpath
, len
- 1) != 0) {
2417 // this hook is public - ignore
2420 // copy the script, and change the entry in confile
2421 ret
= snprintf(tmppath
, MAXPATHLEN
, "%s/%s/%s",
2422 c
->config_path
, c
->name
, fname
+1);
2423 if (ret
< 0 || ret
>= MAXPATHLEN
)
2425 ret
= copy_file(it
->elem
, tmppath
);
2429 it
->elem
= strdup(tmppath
);
2431 ERROR("out of memory copying hook path");
2437 if (!clone_update_unexp_hooks(c
->lxc_conf
)) {
2438 ERROR("Error saving new hooks in clone");
2441 c
->save_config(c
, NULL
);
2445 static void new_hwaddr(char *hwaddr
)
2448 f
= fopen("/dev/urandom", "r");
2451 int ret
= fread(&seed
, sizeof(seed
), 1, f
);
2458 snprintf(hwaddr
, 18, "00:16:3e:%02x:%02x:%02x",
2459 rand() % 255, rand() % 255, rand() % 255);
2462 static void network_new_hwaddrs(struct lxc_container
*c
)
2464 struct lxc_list
*it
;
2466 lxc_list_for_each(it
, &c
->lxc_conf
->network
) {
2467 struct lxc_netdev
*n
= it
->elem
;
2469 new_hwaddr(n
->hwaddr
);
2473 static int copy_fstab(struct lxc_container
*oldc
, struct lxc_container
*c
)
2475 char newpath
[MAXPATHLEN
];
2476 char *oldpath
= oldc
->lxc_conf
->fstab
;
2482 clear_unexp_config_line(c
->lxc_conf
, "lxc.mount", false);
2484 char *p
= strrchr(oldpath
, '/');
2487 ret
= snprintf(newpath
, MAXPATHLEN
, "%s/%s%s",
2488 c
->config_path
, c
->name
, p
);
2489 if (ret
< 0 || ret
>= MAXPATHLEN
) {
2490 ERROR("error printing new path for %s", oldpath
);
2493 if (file_exists(newpath
)) {
2494 ERROR("error: fstab file %s exists", newpath
);
2498 if (copy_file(oldpath
, newpath
) < 0) {
2499 ERROR("error: copying %s to %s", oldpath
, newpath
);
2502 free(c
->lxc_conf
->fstab
);
2503 c
->lxc_conf
->fstab
= strdup(newpath
);
2504 if (!c
->lxc_conf
->fstab
) {
2505 ERROR("error: allocating pathname");
2508 if (!do_append_unexp_config_line(c
->lxc_conf
, "lxc.mount", newpath
)) {
2509 ERROR("error saving new lxctab");
2516 static void copy_rdepends(struct lxc_container
*c
, struct lxc_container
*c0
)
2518 char path0
[MAXPATHLEN
], path1
[MAXPATHLEN
];
2521 ret
= snprintf(path0
, MAXPATHLEN
, "%s/%s/lxc_rdepends", c0
->config_path
,
2523 if (ret
< 0 || ret
>= MAXPATHLEN
) {
2524 WARN("Error copying reverse dependencies");
2527 ret
= snprintf(path1
, MAXPATHLEN
, "%s/%s/lxc_rdepends", c
->config_path
,
2529 if (ret
< 0 || ret
>= MAXPATHLEN
) {
2530 WARN("Error copying reverse dependencies");
2533 if (copy_file(path0
, path1
) < 0) {
2534 INFO("Error copying reverse dependencies");
2539 static bool add_rdepends(struct lxc_container
*c
, struct lxc_container
*c0
)
2542 char path
[MAXPATHLEN
];
2546 ret
= snprintf(path
, MAXPATHLEN
, "%s/%s/lxc_rdepends", c
->config_path
,
2548 if (ret
< 0 || ret
>= MAXPATHLEN
)
2550 f
= fopen(path
, "a");
2554 // if anything goes wrong, just return an error
2555 if (fprintf(f
, "%s\n%s\n", c0
->config_path
, c0
->name
) < 0)
2562 static int copy_storage(struct lxc_container
*c0
, struct lxc_container
*c
,
2563 const char *newtype
, int flags
, const char *bdevdata
, uint64_t newsize
)
2568 bdev
= bdev_copy(c0
, c
->name
, c
->config_path
, newtype
, flags
,
2569 bdevdata
, newsize
, &need_rdep
);
2571 ERROR("Error copying storage");
2574 free(c
->lxc_conf
->rootfs
.path
);
2575 c
->lxc_conf
->rootfs
.path
= strdup(bdev
->src
);
2577 if (!c
->lxc_conf
->rootfs
.path
) {
2578 ERROR("Out of memory while setting storage path");
2581 // We will simply append a new lxc.rootfs entry to the unexpanded config
2582 clear_unexp_config_line(c
->lxc_conf
, "lxc.rootfs", false);
2583 if (!do_append_unexp_config_line(c
->lxc_conf
, "lxc.rootfs", c
->lxc_conf
->rootfs
.path
)) {
2584 ERROR("Error saving new rootfs to cloend config");
2587 if (flags
& LXC_CLONE_SNAPSHOT
)
2588 copy_rdepends(c
, c0
);
2590 if (!add_rdepends(c
, c0
))
2591 WARN("Error adding reverse dependency from %s to %s",
2595 mod_all_rdeps(c
, true);
2600 struct clone_update_data
{
2601 struct lxc_container
*c0
;
2602 struct lxc_container
*c1
;
2607 static int clone_update_rootfs(struct clone_update_data
*data
)
2609 struct lxc_container
*c0
= data
->c0
;
2610 struct lxc_container
*c
= data
->c1
;
2611 int flags
= data
->flags
;
2612 char **hookargs
= data
->hookargs
;
2614 char path
[MAXPATHLEN
];
2617 struct lxc_conf
*conf
= c
->lxc_conf
;
2619 /* update hostname in rootfs */
2620 /* we're going to mount, so run in a clean namespace to simplify cleanup */
2622 if (setgid(0) < 0) {
2623 ERROR("Failed to setgid to 0");
2626 if (setuid(0) < 0) {
2627 ERROR("Failed to setuid to 0");
2630 if (setgroups(0, NULL
) < 0)
2631 WARN("Failed to clear groups");
2633 if (unshare(CLONE_NEWNS
) < 0)
2635 bdev
= bdev_init(c
->lxc_conf
, c
->lxc_conf
->rootfs
.path
, c
->lxc_conf
->rootfs
.mount
, NULL
);
2638 if (strcmp(bdev
->type
, "dir") != 0) {
2639 if (unshare(CLONE_NEWNS
) < 0) {
2640 ERROR("error unsharing mounts");
2644 if (detect_shared_rootfs()) {
2645 if (mount(NULL
, "/", NULL
, MS_SLAVE
|MS_REC
, NULL
)) {
2646 SYSERROR("Failed to make / rslave");
2647 ERROR("Continuing...");
2650 if (bdev
->ops
->mount(bdev
) < 0) {
2654 } else { // TODO come up with a better way
2657 bdev
->dest
= strdup(bdev
->src
);
2660 if (!lxc_list_empty(&conf
->hooks
[LXCHOOK_CLONE
])) {
2661 /* Start of environment variable setup for hooks */
2662 if (setenv("LXC_SRC_NAME", c0
->name
, 1)) {
2663 SYSERROR("failed to set environment variable for source container name");
2665 if (setenv("LXC_NAME", c
->name
, 1)) {
2666 SYSERROR("failed to set environment variable for container name");
2668 if (setenv("LXC_CONFIG_FILE", conf
->rcfile
, 1)) {
2669 SYSERROR("failed to set environment variable for config path");
2671 if (setenv("LXC_ROOTFS_MOUNT", bdev
->dest
, 1)) {
2672 SYSERROR("failed to set environment variable for rootfs mount");
2674 if (setenv("LXC_ROOTFS_PATH", conf
->rootfs
.path
, 1)) {
2675 SYSERROR("failed to set environment variable for rootfs mount");
2678 if (run_lxc_hooks(c
->name
, "clone", conf
, c
->get_config_path(c
), hookargs
)) {
2679 ERROR("Error executing clone hook for %s", c
->name
);
2685 if (!(flags
& LXC_CLONE_KEEPNAME
)) {
2686 ret
= snprintf(path
, MAXPATHLEN
, "%s/etc/hostname", bdev
->dest
);
2689 if (ret
< 0 || ret
>= MAXPATHLEN
)
2691 if (!file_exists(path
))
2693 if (!(fout
= fopen(path
, "w"))) {
2694 SYSERROR("unable to open %s: ignoring", path
);
2697 if (fprintf(fout
, "%s", c
->name
) < 0) {
2701 if (fclose(fout
) < 0)
2710 static int clone_update_rootfs_wrapper(void *data
)
2712 struct clone_update_data
*arg
= (struct clone_update_data
*) data
;
2713 return clone_update_rootfs(arg
);
2717 * We want to support:
2718 sudo lxc-clone -o o1 -n n1 -s -L|-fssize fssize -v|--vgname vgname \
2719 -p|--lvprefix lvprefix -t|--fstype fstype -B backingstore
2721 -s [ implies overlayfs]
2725 only rootfs gets converted (copied/snapshotted) on clone.
2728 static int create_file_dirname(char *path
, struct lxc_conf
*conf
)
2730 char *p
= strrchr(path
, '/');
2736 ret
= do_create_container_dir(path
, conf
);
2741 static struct lxc_container
*lxcapi_clone(struct lxc_container
*c
, const char *newname
,
2742 const char *lxcpath
, int flags
,
2743 const char *bdevtype
, const char *bdevdata
, uint64_t newsize
,
2746 struct lxc_container
*c2
= NULL
;
2747 char newpath
[MAXPATHLEN
];
2748 int ret
, storage_copied
= 0;
2749 char *origroot
= NULL
;
2750 struct clone_update_data data
;
2754 if (!c
|| !c
->is_defined(c
))
2757 if (container_mem_lock(c
))
2760 if (!is_stopped(c
)) {
2761 ERROR("error: Original container (%s) is running", c
->name
);
2765 // Make sure the container doesn't yet exist.
2769 lxcpath
= c
->get_config_path(c
);
2770 ret
= snprintf(newpath
, MAXPATHLEN
, "%s/%s/config", lxcpath
, newname
);
2771 if (ret
< 0 || ret
>= MAXPATHLEN
) {
2772 SYSERROR("clone: failed making config pathname");
2775 if (file_exists(newpath
)) {
2776 ERROR("error: clone: %s exists", newpath
);
2780 ret
= create_file_dirname(newpath
, c
->lxc_conf
);
2781 if (ret
< 0 && errno
!= EEXIST
) {
2782 ERROR("Error creating container dir for %s", newpath
);
2786 // copy the configuration, tweak it as needed,
2787 if (c
->lxc_conf
->rootfs
.path
) {
2788 origroot
= c
->lxc_conf
->rootfs
.path
;
2789 c
->lxc_conf
->rootfs
.path
= NULL
;
2791 fout
= fopen(newpath
, "w");
2793 SYSERROR("open %s", newpath
);
2796 write_config(fout
, c
->lxc_conf
);
2798 c
->lxc_conf
->rootfs
.path
= origroot
;
2800 sprintf(newpath
, "%s/%s/rootfs", lxcpath
, newname
);
2801 if (mkdir(newpath
, 0755) < 0) {
2802 SYSERROR("error creating %s", newpath
);
2807 if (chown_mapped_root(newpath
, c
->lxc_conf
) < 0) {
2808 ERROR("Error chowning %s to container root", newpath
);
2813 c2
= lxc_container_new(newname
, lxcpath
);
2815 ERROR("clone: failed to create new container (%s %s)", newname
,
2820 // copy/snapshot rootfs's
2821 ret
= copy_storage(c
, c2
, bdevtype
, flags
, bdevdata
, newsize
);
2825 clear_unexp_config_line(c2
->lxc_conf
, "lxc.utsname", false);
2828 if (!set_config_item_locked(c2
, "lxc.utsname", newname
)) {
2829 ERROR("Error setting new hostname");
2834 ret
= copyhooks(c
, c2
);
2836 ERROR("error copying hooks");
2840 if (copy_fstab(c
, c2
) < 0) {
2841 ERROR("error copying fstab");
2846 if (!(flags
& LXC_CLONE_KEEPMACADDR
)) {
2847 network_new_hwaddrs(c2
);
2848 if (!clone_update_unexp_network(c2
->lxc_conf
)) {
2849 ERROR("Error updating network for clone");
2854 // We've now successfully created c2's storage, so clear it out if we
2858 if (!c2
->save_config(c2
, NULL
))
2861 if ((pid
= fork()) < 0) {
2866 ret
= wait_for_pid(pid
);
2869 container_mem_unlock(c
);
2875 data
.hookargs
= hookargs
;
2877 ret
= userns_exec_1(c
->lxc_conf
, clone_update_rootfs_wrapper
,
2880 ret
= clone_update_rootfs(&data
);
2884 container_mem_unlock(c
);
2888 container_mem_unlock(c
);
2890 if (!storage_copied
)
2891 c2
->lxc_conf
->rootfs
.path
= NULL
;
2893 lxc_container_put(c2
);
2899 static bool lxcapi_rename(struct lxc_container
*c
, const char *newname
)
2902 struct lxc_container
*newc
;
2904 if (!c
|| !c
->name
|| !c
->config_path
|| !c
->lxc_conf
)
2907 if (has_fs_snapshots(c
) || has_snapshots(c
)) {
2908 ERROR("Renaming a container with snapshots is not supported");
2911 bdev
= bdev_init(c
->lxc_conf
, c
->lxc_conf
->rootfs
.path
, c
->lxc_conf
->rootfs
.mount
, NULL
);
2913 ERROR("Failed to find original backing store type");
2917 newc
= lxcapi_clone(c
, newname
, c
->config_path
, LXC_CLONE_KEEPMACADDR
, NULL
, bdev
->type
, 0, NULL
);
2920 lxc_container_put(newc
);
2924 if (newc
&& lxcapi_is_defined(newc
))
2925 lxc_container_put(newc
);
2927 if (!container_destroy(c
)) {
2928 ERROR("Could not destroy existing container %s", c
->name
);
2934 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
)
2939 return lxc_attach(c
->name
, c
->config_path
, exec_function
, exec_payload
, options
, attached_process
);
2942 static int lxcapi_attach_run_wait(struct lxc_container
*c
, lxc_attach_options_t
*options
, const char *program
, const char * const argv
[])
2944 lxc_attach_command_t command
;
2951 command
.program
= (char*)program
;
2952 command
.argv
= (char**)argv
;
2953 r
= lxc_attach(c
->name
, c
->config_path
, lxc_attach_run_command
, &command
, options
, &pid
);
2958 return lxc_wait_for_pid_status(pid
);
2961 static int get_next_index(const char *lxcpath
, char *cname
)
2967 fname
= alloca(strlen(lxcpath
) + 20);
2969 sprintf(fname
, "%s/snap%d", lxcpath
, i
);
2970 ret
= stat(fname
, &sb
);
2977 static bool get_snappath_dir(struct lxc_container
*c
, char *snappath
)
2981 * If the old style snapshot path exists, use it
2982 * /var/lib/lxc -> /var/lib/lxcsnaps
2984 ret
= snprintf(snappath
, MAXPATHLEN
, "%ssnaps", c
->config_path
);
2985 if (ret
< 0 || ret
>= MAXPATHLEN
)
2987 if (dir_exists(snappath
)) {
2988 ret
= snprintf(snappath
, MAXPATHLEN
, "%ssnaps/%s", c
->config_path
, c
->name
);
2989 if (ret
< 0 || ret
>= MAXPATHLEN
)
2995 * Use the new style path
2996 * /var/lib/lxc -> /var/lib/lxc + c->name + /snaps + \0
2998 ret
= snprintf(snappath
, MAXPATHLEN
, "%s/%s/snaps", c
->config_path
, c
->name
);
2999 if (ret
< 0 || ret
>= MAXPATHLEN
)
3004 static int lxcapi_snapshot(struct lxc_container
*c
, const char *commentfile
)
3007 struct lxc_container
*c2
;
3008 char snappath
[MAXPATHLEN
], newname
[20];
3010 if (!c
|| !lxcapi_is_defined(c
))
3013 if (!bdev_can_backup(c
->lxc_conf
)) {
3014 ERROR("%s's backing store cannot be backed up.", c
->name
);
3015 ERROR("Your container must use another backing store type.");
3019 if (!get_snappath_dir(c
, snappath
))
3022 i
= get_next_index(snappath
, c
->name
);
3024 if (mkdir_p(snappath
, 0755) < 0) {
3025 ERROR("Failed to create snapshot directory %s", snappath
);
3029 ret
= snprintf(newname
, 20, "snap%d", i
);
3030 if (ret
< 0 || ret
>= 20)
3034 * We pass LXC_CLONE_SNAPSHOT to make sure that a rdepends file entry is
3035 * created in the original container
3037 flags
= LXC_CLONE_SNAPSHOT
| LXC_CLONE_KEEPMACADDR
| LXC_CLONE_KEEPNAME
|
3038 LXC_CLONE_KEEPBDEVTYPE
| LXC_CLONE_MAYBE_SNAPSHOT
;
3039 if (bdev_is_dir(c
->lxc_conf
, c
->lxc_conf
->rootfs
.path
)) {
3040 ERROR("Snapshot of directory-backed container requested.");
3041 ERROR("Making a copy-clone. If you do want snapshots, then");
3042 ERROR("please create an aufs or overlayfs clone first, snapshot that");
3043 ERROR("and keep the original container pristine.");
3044 flags
&= ~LXC_CLONE_SNAPSHOT
| LXC_CLONE_MAYBE_SNAPSHOT
;
3046 c2
= c
->clone(c
, newname
, snappath
, flags
, NULL
, NULL
, 0, NULL
);
3048 ERROR("clone of %s:%s failed", c
->config_path
, c
->name
);
3052 lxc_container_put(c2
);
3054 // Now write down the creation time
3061 tm_info
= localtime(&timer
);
3063 strftime(buffer
, 25, "%Y:%m:%d %H:%M:%S", tm_info
);
3065 char *dfnam
= alloca(strlen(snappath
) + strlen(newname
) + 5);
3066 sprintf(dfnam
, "%s/%s/ts", snappath
, newname
);
3067 f
= fopen(dfnam
, "w");
3069 ERROR("Failed to open %s", dfnam
);
3072 if (fprintf(f
, "%s", buffer
) < 0) {
3073 SYSERROR("Writing timestamp");
3079 SYSERROR("Writing timestamp");
3084 // $p / $name / comment \0
3085 int len
= strlen(snappath
) + strlen(newname
) + 10;
3086 char *path
= alloca(len
);
3087 sprintf(path
, "%s/%s/comment", snappath
, newname
);
3088 return copy_file(commentfile
, path
) < 0 ? -1 : i
;
3094 static void lxcsnap_free(struct lxc_snapshot
*s
)
3098 if (s
->comment_pathname
)
3099 free(s
->comment_pathname
);
3106 static char *get_snapcomment_path(char* snappath
, char *name
)
3108 // $snappath/$name/comment
3109 int ret
, len
= strlen(snappath
) + strlen(name
) + 10;
3110 char *s
= malloc(len
);
3113 ret
= snprintf(s
, len
, "%s/%s/comment", snappath
, name
);
3114 if (ret
< 0 || ret
>= len
) {
3122 static char *get_timestamp(char* snappath
, char *name
)
3124 char path
[MAXPATHLEN
], *s
= NULL
;
3128 ret
= snprintf(path
, MAXPATHLEN
, "%s/%s/ts", snappath
, name
);
3129 if (ret
< 0 || ret
>= MAXPATHLEN
)
3131 fin
= fopen(path
, "r");
3134 (void) fseek(fin
, 0, SEEK_END
);
3136 (void) fseek(fin
, 0, SEEK_SET
);
3141 if (fread(s
, 1, len
, fin
) != len
) {
3142 SYSERROR("reading timestamp");
3152 static int lxcapi_snapshot_list(struct lxc_container
*c
, struct lxc_snapshot
**ret_snaps
)
3154 char snappath
[MAXPATHLEN
], path2
[MAXPATHLEN
];
3156 struct dirent dirent
, *direntp
;
3157 struct lxc_snapshot
*snaps
=NULL
, *nsnaps
;
3160 if (!c
|| !lxcapi_is_defined(c
))
3163 if (!get_snappath_dir(c
, snappath
)) {
3164 ERROR("path name too long");
3167 dir
= opendir(snappath
);
3169 INFO("failed to open %s - assuming no snapshots", snappath
);
3173 while (!readdir_r(dir
, &dirent
, &direntp
)) {
3177 if (!strcmp(direntp
->d_name
, "."))
3180 if (!strcmp(direntp
->d_name
, ".."))
3183 ret
= snprintf(path2
, MAXPATHLEN
, "%s/%s/config", snappath
, direntp
->d_name
);
3184 if (ret
< 0 || ret
>= MAXPATHLEN
) {
3185 ERROR("pathname too long");
3188 if (!file_exists(path2
))
3190 nsnaps
= realloc(snaps
, (count
+ 1)*sizeof(*snaps
));
3192 SYSERROR("Out of memory");
3196 snaps
[count
].free
= lxcsnap_free
;
3197 snaps
[count
].name
= strdup(direntp
->d_name
);
3198 if (!snaps
[count
].name
)
3200 snaps
[count
].lxcpath
= strdup(snappath
);
3201 if (!snaps
[count
].lxcpath
) {
3202 free(snaps
[count
].name
);
3205 snaps
[count
].comment_pathname
= get_snapcomment_path(snappath
, direntp
->d_name
);
3206 snaps
[count
].timestamp
= get_timestamp(snappath
, direntp
->d_name
);
3211 WARN("failed to close directory");
3219 for (i
=0; i
<count
; i
++)
3220 lxcsnap_free(&snaps
[i
]);
3224 WARN("failed to close directory");
3228 static bool lxcapi_snapshot_restore(struct lxc_container
*c
, const char *snapname
, const char *newname
)
3230 char clonelxcpath
[MAXPATHLEN
];
3232 struct lxc_container
*snap
, *rest
;
3236 if (!c
|| !c
->name
|| !c
->config_path
)
3239 if (has_fs_snapshots(c
)) {
3240 ERROR("container rootfs has dependent snapshots");
3244 bdev
= bdev_init(c
->lxc_conf
, c
->lxc_conf
->rootfs
.path
, c
->lxc_conf
->rootfs
.mount
, NULL
);
3246 ERROR("Failed to find original backing store type");
3253 if (!get_snappath_dir(c
, clonelxcpath
)) {
3257 // how should we lock this?
3259 snap
= lxc_container_new(snapname
, clonelxcpath
);
3260 if (!snap
|| !lxcapi_is_defined(snap
)) {
3261 ERROR("Could not open snapshot %s", snapname
);
3262 if (snap
) lxc_container_put(snap
);
3267 if (strcmp(c
->name
, newname
) == 0) {
3268 if (!container_destroy(c
)) {
3269 ERROR("Could not destroy existing container %s", newname
);
3270 lxc_container_put(snap
);
3276 if (strcmp(bdev
->type
, "dir") != 0 && strcmp(bdev
->type
, "loop") != 0)
3277 flags
= LXC_CLONE_SNAPSHOT
| LXC_CLONE_MAYBE_SNAPSHOT
;
3278 rest
= lxcapi_clone(snap
, newname
, c
->config_path
, flags
,
3279 bdev
->type
, NULL
, 0, NULL
);
3281 if (rest
&& lxcapi_is_defined(rest
))
3284 lxc_container_put(rest
);
3285 lxc_container_put(snap
);
3289 static bool do_snapshot_destroy(const char *snapname
, const char *clonelxcpath
)
3291 struct lxc_container
*snap
= NULL
;
3294 snap
= lxc_container_new(snapname
, clonelxcpath
);
3296 ERROR("Could not find snapshot %s", snapname
);
3300 if (!lxcapi_destroy(snap
)) {
3301 ERROR("Could not destroy snapshot %s", snapname
);
3308 lxc_container_put(snap
);
3312 static bool remove_all_snapshots(const char *path
)
3315 struct dirent dirent
, *direntp
;
3318 dir
= opendir(path
);
3320 SYSERROR("opendir on snapshot path %s", path
);
3323 while (!readdir_r(dir
, &dirent
, &direntp
)) {
3326 if (!strcmp(direntp
->d_name
, "."))
3328 if (!strcmp(direntp
->d_name
, ".."))
3330 if (!do_snapshot_destroy(direntp
->d_name
, path
)) {
3339 SYSERROR("Error removing directory %s", path
);
3344 static bool lxcapi_snapshot_destroy(struct lxc_container
*c
, const char *snapname
)
3346 char clonelxcpath
[MAXPATHLEN
];
3348 if (!c
|| !c
->name
|| !c
->config_path
|| !snapname
)
3351 if (!get_snappath_dir(c
, clonelxcpath
))
3354 return do_snapshot_destroy(snapname
, clonelxcpath
);
3357 static bool lxcapi_snapshot_destroy_all(struct lxc_container
*c
)
3359 char clonelxcpath
[MAXPATHLEN
];
3361 if (!c
|| !c
->name
|| !c
->config_path
)
3364 if (!get_snappath_dir(c
, clonelxcpath
))
3367 return remove_all_snapshots(clonelxcpath
);
3370 static bool lxcapi_may_control(struct lxc_container
*c
)
3372 return lxc_try_cmd(c
->name
, c
->config_path
) == 0;
3375 static bool do_add_remove_node(pid_t init_pid
, const char *path
, bool add
,
3378 char chrootpath
[MAXPATHLEN
];
3379 char *directory_path
= NULL
;
3383 if ((pid
= fork()) < 0) {
3384 SYSERROR("failed to fork a child helper");
3388 if (wait_for_pid(pid
) != 0) {
3389 ERROR("Failed to create note in guest");
3395 /* prepare the path */
3396 ret
= snprintf(chrootpath
, MAXPATHLEN
, "/proc/%d/root", init_pid
);
3397 if (ret
< 0 || ret
>= MAXPATHLEN
)
3400 if (chroot(chrootpath
) < 0)
3404 /* remove path if it exists */
3405 if(faccessat(AT_FDCWD
, path
, F_OK
, AT_SYMLINK_NOFOLLOW
) == 0) {
3406 if (unlink(path
) < 0) {
3407 ERROR("unlink failed");
3414 /* create any missing directories */
3415 directory_path
= dirname(strdup(path
));
3416 if (mkdir_p(directory_path
, 0755) < 0 && errno
!= EEXIST
) {
3417 ERROR("failed to create directory");
3421 /* create the device node */
3422 if (mknod(path
, st
->st_mode
, st
->st_rdev
) < 0) {
3423 ERROR("mknod failed");
3430 static bool add_remove_device_node(struct lxc_container
*c
, const char *src_path
, const char *dest_path
, bool add
)
3434 char value
[MAX_BUFFER
];
3437 /* make sure container is running */
3438 if (!c
->is_running(c
)) {
3439 ERROR("container is not running");
3443 /* use src_path if dest_path is NULL otherwise use dest_path */
3444 p
= dest_path
? dest_path
: src_path
;
3446 /* make sure we can access p */
3447 if(access(p
, F_OK
) < 0 || stat(p
, &st
) < 0)
3450 /* continue if path is character device or block device */
3451 if (S_ISCHR(st
.st_mode
))
3452 ret
= snprintf(value
, MAX_BUFFER
, "c %d:%d rwm", major(st
.st_rdev
), minor(st
.st_rdev
));
3453 else if (S_ISBLK(st
.st_mode
))
3454 ret
= snprintf(value
, MAX_BUFFER
, "b %d:%d rwm", major(st
.st_rdev
), minor(st
.st_rdev
));
3458 /* check snprintf return code */
3459 if (ret
< 0 || ret
>= MAX_BUFFER
)
3462 if (!do_add_remove_node(c
->init_pid(c
), p
, add
, &st
))
3465 /* add or remove device to/from cgroup access list */
3467 if (!c
->set_cgroup_item(c
, "devices.allow", value
)) {
3468 ERROR("set_cgroup_item failed while adding the device node");
3472 if (!c
->set_cgroup_item(c
, "devices.deny", value
)) {
3473 ERROR("set_cgroup_item failed while removing the device node");
3481 static bool lxcapi_add_device_node(struct lxc_container
*c
, const char *src_path
, const char *dest_path
)
3484 ERROR(NOT_SUPPORTED_ERROR
, __FUNCTION__
);
3487 return add_remove_device_node(c
, src_path
, dest_path
, true);
3490 static bool lxcapi_remove_device_node(struct lxc_container
*c
, const char *src_path
, const char *dest_path
)
3493 ERROR(NOT_SUPPORTED_ERROR
, __FUNCTION__
);
3496 return add_remove_device_node(c
, src_path
, dest_path
, false);
3500 /* The type of criu invocation, one of "dump" or "restore" */
3503 /* The directory to pass to criu */
3506 /* The container to dump */
3507 struct lxc_container
*c
;
3509 /* Enable criu verbose mode? */
3512 /* dump: stop the container or not after dumping? */
3515 /* restore: the file to write the init process' pid into */
3520 * @out must be 128 bytes long
3522 static int read_criu_file(const char *directory
, const char *file
, int netnr
, char *out
)
3524 char path
[PATH_MAX
];
3528 ret
= snprintf(path
, PATH_MAX
, "%s/%s%d", directory
, file
, netnr
);
3529 if (ret
< 0 || ret
>= PATH_MAX
) {
3530 ERROR("%s: path too long", __func__
);
3534 f
= fopen(path
, "r");
3538 ret
= fscanf(f
, "%127s", out
);
3546 static void exec_criu(struct criu_opts
*opts
)
3548 char **argv
, log
[PATH_MAX
];
3549 int static_args
= 13, argc
= 0, i
, ret
;
3551 /* The command line always looks like:
3552 * criu $(action) --tcp-established --file-locks --link-remap --manage-cgroups \
3553 * --action-script foo.sh -D $(directory) -o $(directory)/$(action).log
3554 * +1 for final NULL */
3556 if (strcmp(opts
->action
, "dump") == 0) {
3560 /* --leave-running */
3563 } else if (strcmp(opts
->action
, "restore") == 0) {
3564 /* --root $(lxc_mount_point) --restore-detached --pidfile $foo */
3573 ret
= snprintf(log
, PATH_MAX
, "%s/%s.log", opts
->directory
, opts
->action
);
3574 if (ret
< 0 || ret
>= PATH_MAX
) {
3575 ERROR("logfile name too long\n");
3579 argv
= malloc(static_args
* sizeof(*argv
));
3583 memset(argv
, 0, static_args
* sizeof(*argv
));
3585 #define DECLARE_ARG(arg) \
3587 argv[argc++] = strdup(arg); \
3588 if (!argv[argc-1]) \
3592 argv
[argc
++] = on_path("criu", NULL
);
3593 if (!argv
[argc
-1]) {
3594 ERROR("Couldn't find criu binary\n");
3598 DECLARE_ARG(opts
->action
);
3599 DECLARE_ARG("--tcp-established");
3600 DECLARE_ARG("--file-locks");
3601 DECLARE_ARG("--link-remap");
3602 DECLARE_ARG("--manage-cgroups");
3603 DECLARE_ARG("--action-script");
3604 DECLARE_ARG(LIBEXECDIR
"/lxc/lxc-restore-net");
3606 DECLARE_ARG(opts
->directory
);
3611 DECLARE_ARG("-vvvvvv");
3613 if (strcmp(opts
->action
, "dump") == 0) {
3616 if (sprintf(pid
, "%d", lxcapi_init_pid(opts
->c
)) < 0)
3622 DECLARE_ARG("--leave-running");
3623 } else if (strcmp(opts
->action
, "restore") == 0) {
3625 struct lxc_list
*it
;
3627 DECLARE_ARG("--root");
3628 DECLARE_ARG(opts
->c
->lxc_conf
->rootfs
.mount
);
3629 DECLARE_ARG("--restore-detached");
3630 DECLARE_ARG("--pidfile");
3631 DECLARE_ARG(opts
->pidfile
);
3633 lxc_list_for_each(it
, &opts
->c
->lxc_conf
->network
) {
3634 char eth
[128], veth
[128], buf
[257];
3637 if (read_criu_file(opts
->directory
, "veth", netnr
, veth
))
3639 if (read_criu_file(opts
->directory
, "eth", netnr
, eth
))
3641 ret
= snprintf(buf
, 257, "%s=%s", eth
, veth
);
3642 if (ret
< 0 || ret
>= 257)
3645 /* final NULL and --veth-pair eth0:vethASDF */
3646 m
= realloc(argv
, (argc
+ 1 + 2) * sizeof(*argv
));
3651 DECLARE_ARG("--veth-pair");
3661 execv(argv
[0], argv
);
3663 for (i
= 0; argv
[i
]; i
++)
3668 /* Check and make sure the container has a configuration that we know CRIU can
3670 static bool criu_ok(struct lxc_container
*c
)
3672 struct lxc_list
*it
;
3673 bool found_deny_rule
= false;
3676 ERROR("Must be root to checkpoint\n");
3680 /* We only know how to restore containers with veth networks. */
3681 lxc_list_for_each(it
, &c
->lxc_conf
->network
) {
3682 struct lxc_netdev
*n
= it
->elem
;
3683 if (n
->type
!= LXC_NET_VETH
&& n
->type
!= LXC_NET_NONE
) {
3684 ERROR("Found network that is not VETH or NONE\n");
3689 // These requirements come from http://criu.org/LXC
3690 if (c
->lxc_conf
->console
.path
&&
3691 strcmp(c
->lxc_conf
->console
.path
, "none") != 0) {
3692 ERROR("lxc.console must be none\n");
3696 if (c
->lxc_conf
->tty
!= 0) {
3697 ERROR("lxc.tty must be 0\n");
3701 lxc_list_for_each(it
, &c
->lxc_conf
->cgroup
) {
3702 struct lxc_cgroup
*cg
= it
->elem
;
3703 if (strcmp(cg
->subsystem
, "devices.deny") == 0 &&
3704 strcmp(cg
->value
, "c 5:1 rwm") == 0) {
3706 found_deny_rule
= true;
3711 if (!found_deny_rule
) {
3712 ERROR("couldn't find devices.deny = c 5:1 rwm");
3719 static bool lxcapi_checkpoint(struct lxc_container
*c
, char *directory
, bool stop
, bool verbose
)
3722 struct lxc_list
*it
;
3729 if (mkdir(directory
, 0700) < 0 && errno
!= EEXIST
)
3733 lxc_list_for_each(it
, &c
->lxc_conf
->network
) {
3734 char *veth
= NULL
, *bridge
= NULL
, veth_path
[PATH_MAX
], eth
[128];
3735 struct lxc_netdev
*n
= it
->elem
;
3738 pret
= snprintf(veth_path
, PATH_MAX
, "lxc.network.%d.veth.pair", netnr
);
3739 if (pret
< 0 || pret
>= PATH_MAX
) {
3744 veth
= lxcapi_get_running_config_item(c
, veth_path
);
3746 /* criu_ok() checks that all interfaces are
3747 * LXC_NET{VETH,NONE}, and VETHs should have this
3749 assert(n
->type
== LXC_NET_NONE
);
3753 pret
= snprintf(veth_path
, PATH_MAX
, "lxc.network.%d.link", netnr
);
3754 if (pret
< 0 || pret
>= PATH_MAX
) {
3759 bridge
= lxcapi_get_running_config_item(c
, veth_path
);
3765 pret
= snprintf(veth_path
, PATH_MAX
, "%s/veth%d", directory
, netnr
);
3766 if (pret
< 0 || pret
>= PATH_MAX
|| print_to_file(veth_path
, veth
) < 0) {
3771 pret
= snprintf(veth_path
, PATH_MAX
, "%s/bridge%d", directory
, netnr
);
3772 if (pret
< 0 || pret
>= PATH_MAX
|| print_to_file(veth_path
, bridge
) < 0) {
3778 if (strlen(n
->name
) >= 128) {
3782 strncpy(eth
, n
->name
, 128);
3784 sprintf(eth
, "eth%d", netnr
);
3786 pret
= snprintf(veth_path
, PATH_MAX
, "%s/eth%d", directory
, netnr
);
3787 if (pret
< 0 || pret
>= PATH_MAX
|| print_to_file(veth_path
, eth
) < 0)
3802 struct criu_opts os
;
3805 os
.directory
= directory
;
3808 os
.verbose
= verbose
;
3810 /* exec_criu() returning is an error */
3814 pid_t w
= waitpid(pid
, &status
, 0);
3820 if (WIFEXITED(status
)) {
3821 return !WEXITSTATUS(status
);
3828 static bool lxcapi_restore(struct lxc_container
*c
, char *directory
, bool verbose
)
3831 struct lxc_list
*it
;
3832 struct lxc_rootfs
*rootfs
;
3833 char pidfile
[L_tmpnam
];
3839 ERROR("Must be root to restore\n");
3843 if (!tmpnam(pidfile
))
3846 struct lxc_handler
*handler
;
3848 handler
= lxc_init(c
->name
, c
->lxc_conf
, c
->config_path
);
3857 struct criu_opts os
;
3859 if (unshare(CLONE_NEWNS
))
3862 /* CRIU needs the lxc root bind mounted so that it is the root of some
3864 rootfs
= &c
->lxc_conf
->rootfs
;
3866 if (rootfs_is_blockdev(c
->lxc_conf
)) {
3867 if (do_rootfs_setup(c
->lxc_conf
, c
->name
, c
->config_path
) < 0)
3871 if (mkdir(rootfs
->mount
, 0755) < 0 && errno
!= EEXIST
)
3874 if (mount(rootfs
->path
, rootfs
->mount
, NULL
, MS_BIND
, NULL
) < 0) {
3875 rmdir(rootfs
->mount
);
3880 os
.action
= "restore";
3881 os
.directory
= directory
;
3883 os
.pidfile
= pidfile
;
3884 os
.verbose
= verbose
;
3886 /* exec_criu() returning is an error */
3888 umount(rootfs
->mount
);
3889 rmdir(rootfs
->mount
);
3893 pid_t w
= waitpid(pid
, &status
, 0);
3900 if (WIFEXITED(status
)) {
3901 if (WEXITSTATUS(status
)) {
3907 FILE *f
= fopen(pidfile
, "r");
3909 perror("reading pidfile");
3910 ERROR("couldn't read restore's init pidfile %s\n", pidfile
);
3914 ret
= fscanf(f
, "%d", (int*) &handler
->pid
);
3917 ERROR("reading restore pid failed");
3921 if (container_mem_lock(c
))
3924 lxc_list_for_each(it
, &c
->lxc_conf
->network
) {
3925 char eth
[128], veth
[128];
3926 struct lxc_netdev
*netdev
= it
->elem
;
3928 if (read_criu_file(directory
, "veth", netnr
, veth
)) {
3932 if (read_criu_file(directory
, "eth", netnr
, eth
)) {
3936 netdev
->priv
.veth_attr
.pair
= strdup(veth
);
3937 if (!netdev
->priv
.veth_attr
.pair
) {
3944 container_mem_unlock(c
);
3948 if (lxc_set_state(c
->name
, handler
, RUNNING
))
3953 if (lxc_poll(c
->name
, handler
)) {
3954 lxc_abort(c
->name
, handler
);
3962 static int lxcapi_attach_run_waitl(struct lxc_container
*c
, lxc_attach_options_t
*options
, const char *program
, const char *arg
, ...)
3972 argv
= lxc_va_arg_list_to_argv_const(ap
, 1);
3976 ERROR("Memory allocation error.");
3981 ret
= lxcapi_attach_run_wait(c
, options
, program
, (const char * const *)argv
);
3986 struct lxc_container
*lxc_container_new(const char *name
, const char *configpath
)
3988 struct lxc_container
*c
;
3993 c
= malloc(sizeof(*c
));
3995 fprintf(stderr
, "failed to malloc lxc_container\n");
3998 memset(c
, 0, sizeof(*c
));
4001 c
->config_path
= strdup(configpath
);
4003 c
->config_path
= strdup(lxc_global_config_value("lxc.lxcpath"));
4005 if (!c
->config_path
) {
4006 fprintf(stderr
, "Out of memory\n");
4010 remove_trailing_slashes(c
->config_path
);
4011 c
->name
= malloc(strlen(name
)+1);
4013 fprintf(stderr
, "Error allocating lxc_container name\n");
4016 strcpy(c
->name
, name
);
4019 if (!(c
->slock
= lxc_newlock(c
->config_path
, name
))) {
4020 fprintf(stderr
, "failed to create lock\n");
4024 if (!(c
->privlock
= lxc_newlock(NULL
, NULL
))) {
4025 fprintf(stderr
, "failed to alloc privlock\n");
4029 if (!set_config_filename(c
)) {
4030 fprintf(stderr
, "Error allocating config file pathname\n");
4034 if (file_exists(c
->configfile
) && !lxcapi_load_config(c
, NULL
))
4037 if (ongoing_create(c
) == 2) {
4038 ERROR("Error: %s creation was not completed", c
->name
);
4039 container_destroy(c
);
4040 lxcapi_clear_config(c
);
4042 c
->daemonize
= true;
4045 // assign the member functions
4046 c
->is_defined
= lxcapi_is_defined
;
4047 c
->state
= lxcapi_state
;
4048 c
->is_running
= lxcapi_is_running
;
4049 c
->freeze
= lxcapi_freeze
;
4050 c
->unfreeze
= lxcapi_unfreeze
;
4051 c
->console
= lxcapi_console
;
4052 c
->console_getfd
= lxcapi_console_getfd
;
4053 c
->init_pid
= lxcapi_init_pid
;
4054 c
->load_config
= lxcapi_load_config
;
4055 c
->want_daemonize
= lxcapi_want_daemonize
;
4056 c
->want_close_all_fds
= lxcapi_want_close_all_fds
;
4057 c
->start
= lxcapi_start
;
4058 c
->startl
= lxcapi_startl
;
4059 c
->stop
= lxcapi_stop
;
4060 c
->config_file_name
= lxcapi_config_file_name
;
4061 c
->wait
= lxcapi_wait
;
4062 c
->set_config_item
= lxcapi_set_config_item
;
4063 c
->destroy
= lxcapi_destroy
;
4064 c
->destroy_with_snapshots
= lxcapi_destroy_with_snapshots
;
4065 c
->rename
= lxcapi_rename
;
4066 c
->save_config
= lxcapi_save_config
;
4067 c
->get_keys
= lxcapi_get_keys
;
4068 c
->create
= lxcapi_create
;
4069 c
->createl
= lxcapi_createl
;
4070 c
->shutdown
= lxcapi_shutdown
;
4071 c
->reboot
= lxcapi_reboot
;
4072 c
->clear_config
= lxcapi_clear_config
;
4073 c
->clear_config_item
= lxcapi_clear_config_item
;
4074 c
->get_config_item
= lxcapi_get_config_item
;
4075 c
->get_running_config_item
= lxcapi_get_running_config_item
;
4076 c
->get_cgroup_item
= lxcapi_get_cgroup_item
;
4077 c
->set_cgroup_item
= lxcapi_set_cgroup_item
;
4078 c
->get_config_path
= lxcapi_get_config_path
;
4079 c
->set_config_path
= lxcapi_set_config_path
;
4080 c
->clone
= lxcapi_clone
;
4081 c
->get_interfaces
= lxcapi_get_interfaces
;
4082 c
->get_ips
= lxcapi_get_ips
;
4083 c
->attach
= lxcapi_attach
;
4084 c
->attach_run_wait
= lxcapi_attach_run_wait
;
4085 c
->attach_run_waitl
= lxcapi_attach_run_waitl
;
4086 c
->snapshot
= lxcapi_snapshot
;
4087 c
->snapshot_list
= lxcapi_snapshot_list
;
4088 c
->snapshot_restore
= lxcapi_snapshot_restore
;
4089 c
->snapshot_destroy
= lxcapi_snapshot_destroy
;
4090 c
->snapshot_destroy_all
= lxcapi_snapshot_destroy_all
;
4091 c
->may_control
= lxcapi_may_control
;
4092 c
->add_device_node
= lxcapi_add_device_node
;
4093 c
->remove_device_node
= lxcapi_remove_device_node
;
4094 c
->checkpoint
= lxcapi_checkpoint
;
4095 c
->restore
= lxcapi_restore
;
4097 /* we'll allow the caller to update these later */
4098 if (lxc_log_init(NULL
, "none", NULL
, "lxc_container", 0, c
->config_path
)) {
4099 fprintf(stderr
, "failed to open log\n");
4106 lxc_container_free(c
);
4110 int lxc_get_wait_states(const char **states
)
4115 for (i
=0; i
<MAX_STATE
; i
++)
4116 states
[i
] = lxc_state2str(i
);
4121 * These next two could probably be done smarter with reusing a common function
4122 * with different iterators and tests...
4124 int list_defined_containers(const char *lxcpath
, char ***names
, struct lxc_container
***cret
)
4127 int i
, cfound
= 0, nfound
= 0;
4128 struct dirent dirent
, *direntp
;
4129 struct lxc_container
*c
;
4132 lxcpath
= lxc_global_config_value("lxc.lxcpath");
4134 dir
= opendir(lxcpath
);
4136 SYSERROR("opendir on lxcpath");
4145 while (!readdir_r(dir
, &dirent
, &direntp
)) {
4148 if (!strcmp(direntp
->d_name
, "."))
4150 if (!strcmp(direntp
->d_name
, ".."))
4153 if (!config_file_exists(lxcpath
, direntp
->d_name
))
4157 if (!add_to_array(names
, direntp
->d_name
, cfound
))
4167 c
= lxc_container_new(direntp
->d_name
, lxcpath
);
4169 INFO("Container %s:%s has a config but could not be loaded",
4170 lxcpath
, direntp
->d_name
);
4172 if(!remove_from_array(names
, direntp
->d_name
, cfound
--))
4176 if (!lxcapi_is_defined(c
)) {
4177 INFO("Container %s:%s has a config but is not defined",
4178 lxcpath
, direntp
->d_name
);
4180 if(!remove_from_array(names
, direntp
->d_name
, cfound
--))
4182 lxc_container_put(c
);
4186 if (!add_to_clist(cret
, c
, nfound
, true)) {
4187 lxc_container_put(c
);
4197 if (names
&& *names
) {
4198 for (i
=0; i
<cfound
; i
++)
4202 if (cret
&& *cret
) {
4203 for (i
=0; i
<nfound
; i
++)
4204 lxc_container_put((*cret
)[i
]);
4211 int list_active_containers(const char *lxcpath
, char ***nret
,
4212 struct lxc_container
***cret
)
4214 int i
, ret
= -1, cret_cnt
= 0, ct_name_cnt
= 0;
4217 char **ct_name
= NULL
;
4219 struct lxc_container
*c
;
4223 lxcpath
= lxc_global_config_value("lxc.lxcpath");
4224 lxcpath_len
= strlen(lxcpath
);
4231 FILE *f
= fopen("/proc/net/unix", "r");
4235 while (getline(&line
, &len
, f
) != -1) {
4237 char *p
= strrchr(line
, ' '), *p2
;
4246 if (strncmp(p
, lxcpath
, lxcpath_len
) == 0) {
4248 } else if (strncmp(p
, "lxc/", 4) == 0) {
4258 // Now p is the start of lxc_name
4260 if (!p2
|| strncmp(p2
, "/command", 8) != 0)
4265 if (strncmp(lxcpath
, lxc_cmd_get_lxcpath(p
), lxcpath_len
) != 0)
4267 p
= lxc_cmd_get_name(p
);
4270 if (array_contains(&ct_name
, p
, ct_name_cnt
))
4273 if (!add_to_array(&ct_name
, p
, ct_name_cnt
))
4274 goto free_cret_list
;
4281 c
= lxc_container_new(p
, lxcpath
);
4283 INFO("Container %s:%s is running but could not be loaded",
4285 remove_from_array(&ct_name
, p
, ct_name_cnt
--);
4290 * If this is an anonymous container, then is_defined *can*
4291 * return false. So we don't do that check. Count on the
4292 * fact that the command socket exists.
4295 if (!add_to_clist(cret
, c
, cret_cnt
, true)) {
4296 lxc_container_put(c
);
4297 goto free_cret_list
;
4302 assert(!nret
|| !cret
|| cret_cnt
== ct_name_cnt
);
4311 if (cret
&& *cret
) {
4312 for (i
= 0; i
< cret_cnt
; i
++)
4313 lxc_container_put((*cret
)[i
]);
4319 for (i
= 0; i
< ct_name_cnt
; i
++)
4332 int list_all_containers(const char *lxcpath
, char ***nret
,
4333 struct lxc_container
***cret
)
4335 int i
, ret
, active_cnt
, ct_cnt
, ct_list_cnt
;
4338 struct lxc_container
**ct_list
= NULL
;
4340 ct_cnt
= list_defined_containers(lxcpath
, &ct_name
, NULL
);
4344 active_cnt
= list_active_containers(lxcpath
, &active_name
, NULL
);
4345 if (active_cnt
< 0) {
4350 for (i
= 0; i
< active_cnt
; i
++) {
4351 if (!array_contains(&ct_name
, active_name
[i
], ct_cnt
)) {
4352 if (!add_to_array(&ct_name
, active_name
[i
], ct_cnt
)) {
4354 goto free_active_name
;
4358 free(active_name
[i
]);
4359 active_name
[i
] = NULL
;
4365 for (i
= 0, ct_list_cnt
= 0; i
< ct_cnt
&& cret
; i
++) {
4366 struct lxc_container
*c
;
4368 c
= lxc_container_new(ct_name
[i
], lxcpath
);
4370 WARN("Container %s:%s could not be loaded", lxcpath
, ct_name
[i
]);
4371 remove_from_array(&ct_name
, ct_name
[i
], ct_cnt
--);
4375 if (!add_to_clist(&ct_list
, c
, ct_list_cnt
, false)) {
4376 lxc_container_put(c
);
4395 for (i
= 0; i
< ct_list_cnt
; i
++) {
4396 lxc_container_put(ct_list
[i
]);
4402 for (i
= 0; i
< active_cnt
; i
++) {
4404 free(active_name
[i
]);
4410 for (i
= 0; i
< ct_cnt
; i
++) {