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>
36 #include <lxc/lxccontainer.h>
47 #include <lxc/utils.h>
48 #include <lxc/monitor.h>
49 #include <lxc/namespace.h>
51 #include <arpa/inet.h>
57 #include <../include/ifaddrs.h>
62 #include <../include/getline.h>
66 #define MAX_BUFFER 4096
68 lxc_log_define(lxc_container
, lxc
);
70 static bool file_exists(char *f
)
74 return stat(f
, &statbuf
) == 0;
77 static bool config_file_exists(const char *lxcpath
, const char *cname
)
79 /* $lxcpath + '/' + $cname + '/config' + \0 */
80 int ret
, len
= strlen(lxcpath
) + strlen(cname
) + 9;
81 char *fname
= alloca(len
);
83 ret
= snprintf(fname
, len
, "%s/%s/config", lxcpath
, cname
);
84 if (ret
< 0 || ret
>= len
)
87 return file_exists(fname
);
91 * A few functions to help detect when a container creation failed.
92 * If a container creation was killed partway through, then trying
93 * to actually start that container could harm the host. We detect
94 * this by creating a 'partial' file under the container directory,
95 * and keeping an advisory lock. When container creation completes,
96 * we remove that file. When we load or try to start a container, if
97 * we find that file, without a flock, we remove the container.
99 int ongoing_create(struct lxc_container
*c
)
101 int len
= strlen(c
->config_path
) + strlen(c
->name
) + 10;
102 char *path
= alloca(len
);
106 ret
= snprintf(path
, len
, "%s/%s/partial", c
->config_path
, c
->name
);
107 if (ret
< 0 || ret
>= len
) {
108 ERROR("Error writing partial pathname");
112 if (!file_exists(path
))
115 fd
= open(path
, O_RDWR
);
118 // give benefit of the doubt
119 SYSERROR("Error opening partial file");
123 lk
.l_whence
= SEEK_SET
;
127 if (fcntl(fd
, F_GETLK
, &lk
) == 0 && lk
.l_pid
!= -1) {
128 // create is still ongoing
134 // create completed but partial is still there.
141 int create_partial(struct lxc_container
*c
)
143 // $lxcpath + '/' + $name + '/partial' + \0
144 int len
= strlen(c
->config_path
) + strlen(c
->name
) + 10;
145 char *path
= alloca(len
);
149 ret
= snprintf(path
, len
, "%s/%s/partial", c
->config_path
, c
->name
);
150 if (ret
< 0 || ret
>= len
) {
151 ERROR("Error writing partial pathname");
155 if ((fd
=open(path
, O_RDWR
| O_CREAT
| O_EXCL
, 0755)) < 0) {
156 SYSERROR("Erorr creating partial file");
161 lk
.l_whence
= SEEK_SET
;
164 if (fcntl(fd
, F_SETLKW
, &lk
) < 0) {
165 SYSERROR("Error locking partial file %s", path
);
175 void remove_partial(struct lxc_container
*c
, int fd
)
177 // $lxcpath + '/' + $name + '/partial' + \0
178 int len
= strlen(c
->config_path
) + strlen(c
->name
) + 10;
179 char *path
= alloca(len
);
185 ret
= snprintf(path
, len
, "%s/%s/partial", c
->config_path
, c
->name
);
186 if (ret
< 0 || ret
>= len
) {
187 ERROR("Error writing partial pathname");
190 if (unlink(path
) < 0)
191 SYSERROR("Error unlink partial file %s", path
);
195 * 1. container_mem_lock(c) protects the struct lxc_container from multiple threads.
196 * 2. container_disk_lock(c) protects the on-disk container data - in particular the
197 * container configuration file.
198 * The container_disk_lock also takes the container_mem_lock.
199 * 3. thread_mutex protects process data (ex: fd table) from multiple threads.
200 * NOTHING mutexes two independent programs with their own struct
201 * lxc_container for the same c->name, between API calls. For instance,
202 * c->config_read(); c->start(); Between those calls, data on disk
203 * could change (which shouldn't bother the caller unless for instance
204 * the rootfs get moved). c->config_read(); update; c->config_write();
205 * Two such updaters could race. The callers should therefore check their
206 * results. Trying to prevent that would necessarily expose us to deadlocks
207 * due to hung callers. So I prefer to keep the locks only within our own
208 * functions, not across functions.
210 * If you're going to clone while holding a lxccontainer, increment
211 * c->numthreads (under privlock) before forking. When deleting,
212 * decrement numthreads under privlock, then if it hits 0 you can delete.
213 * Do not ever use a lxccontainer whose numthreads you did not bump.
216 static void lxc_container_free(struct lxc_container
*c
)
223 c
->configfile
= NULL
;
225 if (c
->error_string
) {
226 free(c
->error_string
);
227 c
->error_string
= NULL
;
230 lxc_putlock(c
->slock
);
234 lxc_putlock(c
->privlock
);
242 lxc_conf_free(c
->lxc_conf
);
245 if (c
->config_path
) {
246 free(c
->config_path
);
247 c
->config_path
= NULL
;
253 * Consider the following case:
254 freer | racing get()er
255 ==================================================================
256 lxc_container_put() | lxc_container_get()
257 \ lxclock(c->privlock) | c->numthreads < 1? (no)
258 \ c->numthreads = 0 | \ lxclock(c->privlock) -> waits
260 \ lxc_container_free() | \ lxclock() returns
261 | \ c->numthreads < 1 -> return 0
263 \ \ sem_destroy(privlock) |
265 * When the get()er checks numthreads the first time, one of the following
267 * 1. freer has set numthreads = 0. get() returns 0
268 * 2. freer is between lxclock and setting numthreads to 0. get()er will
269 * sem_wait on privlock, get lxclock after freer() drops it, then see
270 * numthreads is 0 and exit without touching lxclock again..
271 * 3. freer has not yet locked privlock. If get()er runs first, then put()er
272 * will see --numthreads = 1 and not call lxc_container_free().
275 int lxc_container_get(struct lxc_container
*c
)
280 // if someone else has already started freeing the container, don't
281 // try to take the lock, which may be invalid
282 if (c
->numthreads
< 1)
285 if (container_mem_lock(c
))
287 if (c
->numthreads
< 1) {
288 // bail without trying to unlock, bc the privlock is now probably
293 container_mem_unlock(c
);
297 int lxc_container_put(struct lxc_container
*c
)
301 if (container_mem_lock(c
))
303 if (--c
->numthreads
< 1) {
304 container_mem_unlock(c
);
305 lxc_container_free(c
);
308 container_mem_unlock(c
);
312 static bool lxcapi_is_defined(struct lxc_container
*c
)
321 if (container_mem_lock(c
))
325 statret
= stat(c
->configfile
, &statbuf
);
331 container_mem_unlock(c
);
335 static const char *lxcapi_state(struct lxc_container
*c
)
341 s
= lxc_getstate(c
->name
, c
->config_path
);
342 return lxc_state2str(s
);
345 static bool is_stopped(struct lxc_container
*c
)
348 s
= lxc_getstate(c
->name
, c
->config_path
);
349 return (s
== STOPPED
);
352 static bool lxcapi_is_running(struct lxc_container
*c
)
359 if (!s
|| strcmp(s
, "STOPPED") == 0)
364 static bool lxcapi_freeze(struct lxc_container
*c
)
370 ret
= lxc_freeze(c
->name
, c
->config_path
);
376 static bool lxcapi_unfreeze(struct lxc_container
*c
)
382 ret
= lxc_unfreeze(c
->name
, c
->config_path
);
388 static int lxcapi_console_getfd(struct lxc_container
*c
, int *ttynum
, int *masterfd
)
394 ttyfd
= lxc_console_getfd(c
, ttynum
, masterfd
);
398 static int lxcapi_console(struct lxc_container
*c
, int ttynum
, int stdinfd
,
399 int stdoutfd
, int stderrfd
, int escape
)
401 return lxc_console(c
, ttynum
, stdinfd
, stdoutfd
, stderrfd
, escape
);
404 static pid_t
lxcapi_init_pid(struct lxc_container
*c
)
409 return lxc_cmd_get_init_pid(c
->name
, c
->config_path
);
412 static bool load_config_locked(struct lxc_container
*c
, const char *fname
)
415 c
->lxc_conf
= lxc_conf_init();
416 if (c
->lxc_conf
&& !lxc_config_read(fname
, c
->lxc_conf
))
421 static bool lxcapi_load_config(struct lxc_container
*c
, const char *alt_file
)
423 bool ret
= false, need_disklock
= false;
429 fname
= c
->configfile
;
435 * If we're reading something other than the container's config,
436 * we only need to lock the in-memory container. If loading the
437 * container's config file, take the disk lock.
439 if (strcmp(fname
, c
->configfile
) == 0)
440 need_disklock
= true;
443 lret
= container_disk_lock(c
);
445 lret
= container_mem_lock(c
);
449 ret
= load_config_locked(c
, fname
);
452 container_disk_unlock(c
);
454 container_mem_unlock(c
);
458 static void lxcapi_want_daemonize(struct lxc_container
*c
)
460 if (!c
|| !c
->lxc_conf
)
462 if (container_mem_lock(c
)) {
463 ERROR("Error getting mem lock");
467 /* daemonize implies close_all_fds so set it */
468 c
->lxc_conf
->close_all_fds
= 1;
469 container_mem_unlock(c
);
472 static bool lxcapi_want_close_all_fds(struct lxc_container
*c
)
474 if (!c
|| !c
->lxc_conf
)
476 if (container_mem_lock(c
)) {
477 ERROR("Error getting mem lock");
480 c
->lxc_conf
->close_all_fds
= 1;
481 container_mem_unlock(c
);
485 static bool lxcapi_wait(struct lxc_container
*c
, const char *state
, int timeout
)
492 ret
= lxc_wait(c
->name
, state
, timeout
, c
->config_path
);
497 static bool wait_on_daemonized_start(struct lxc_container
*c
, int pid
)
499 /* we'll probably want to make this timeout configurable? */
500 int timeout
= 5, ret
, status
;
503 * our child is going to fork again, then exit. reap the
506 ret
= waitpid(pid
, &status
, 0);
507 if (ret
== -1 || !WIFEXITED(status
) || WEXITSTATUS(status
) != 0)
508 DEBUG("failed waiting for first dual-fork child");
509 return lxcapi_wait(c
, "RUNNING", timeout
);
512 static bool am_single_threaded(void)
514 struct dirent dirent
, *direntp
;
519 dir
= opendir("/proc/self/task");
522 INFO("failed to open /proc/self/task");
526 while (!readdir_r(dir
, &dirent
, &direntp
)) {
530 if (!strcmp(direntp
->d_name
, "."))
533 if (!strcmp(direntp
->d_name
, ".."))
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
;
553 char *default_args
[] = {
558 /* container exists */
561 /* container has been setup */
565 if ((ret
= ongoing_create(c
)) < 0) {
566 ERROR("Error checking for incomplete creation");
570 ERROR("Error: %s creation was not completed", c
->name
);
573 } else if (ret
== 1) {
574 ERROR("Error: creation of %s is ongoing", c
->name
);
578 /* is this app meant to be run through lxcinit, as in lxc-execute? */
579 if (useinit
&& !argv
)
582 if (container_mem_lock(c
))
585 daemonize
= c
->daemonize
;
586 container_mem_unlock(c
);
589 ret
= lxc_execute(c
->name
, argv
, 1, conf
, c
->config_path
);
590 return ret
== 0 ? true : false;
597 * say, I'm not sure - what locks do we want here? Any?
598 * Is liblxc's locking enough here to protect the on disk
599 * container? We don't want to exclude things like lxc_info
600 * while container is running...
603 if (!lxc_container_get(c
))
605 lxc_monitord_spawn(c
->config_path
);
609 lxc_container_put(c
);
613 return wait_on_daemonized_start(c
, pid
);
615 process_unlock(); // we're no longer sharing
616 /* second fork to be reparented by init */
619 SYSERROR("Error doing dual-fork");
624 /* like daemon(), chdir to / and redirect 0,1,2 to /dev/null */
626 SYSERROR("Error chdir()ing to /.");
632 open("/dev/zero", O_RDONLY
);
633 open("/dev/null", O_RDWR
);
634 open("/dev/null", O_RDWR
);
637 if (!am_single_threaded()) {
638 ERROR("Cannot start non-daemonized container when threaded");
645 ret
= lxc_start(c
->name
, argv
, conf
, c
->config_path
);
648 INFO("container requested reboot");
654 lxc_container_put(c
);
655 exit (ret
== 0 ? true : false);
657 return (ret
== 0 ? true : false);
662 * note there MUST be an ending NULL
664 static bool lxcapi_startl(struct lxc_container
*c
, int useinit
, ...)
667 char **inargs
= NULL
;
670 /* container exists */
674 va_start(ap
, useinit
);
675 inargs
= lxc_va_arg_list_to_argv(ap
, 0, 1);
679 ERROR("Memory allocation error.");
683 /* pass NULL if no arguments were supplied */
684 bret
= lxcapi_start(c
, useinit
, *inargs
? inargs
: NULL
);
689 for (arg
= inargs
; *arg
; arg
++)
697 static bool lxcapi_stop(struct lxc_container
*c
)
704 ret
= lxc_cmd_stop(c
->name
, c
->config_path
);
710 * create the standard expected container dir
712 static bool create_container_dir(struct lxc_container
*c
)
717 len
= strlen(c
->config_path
) + strlen(c
->name
) + 2;
721 ret
= snprintf(s
, len
, "%s/%s", c
->config_path
, c
->name
);
722 if (ret
< 0 || ret
>= len
) {
726 ret
= mkdir(s
, 0755);
731 SYSERROR("failed to create container path for %s\n", c
->name
);
737 static const char *lxcapi_get_config_path(struct lxc_container
*c
);
738 static bool lxcapi_set_config_item(struct lxc_container
*c
, const char *key
, const char *v
);
741 * do_bdev_create: thin wrapper around bdev_create(). Like bdev_create(),
742 * it returns a mounted bdev on success, NULL on error.
744 static struct bdev
*do_bdev_create(struct lxc_container
*c
, const char *type
,
745 struct bdev_specs
*specs
)
752 /* rootfs.path or lxcpath/lxcname/rootfs */
753 if (c
->lxc_conf
->rootfs
.path
&& access(c
->lxc_conf
->rootfs
.path
, F_OK
) == 0) {
754 const char *rpath
= c
->lxc_conf
->rootfs
.path
;
755 len
= strlen(rpath
) + 1;
757 ret
= snprintf(dest
, len
, "%s", rpath
);
759 const char *lxcpath
= lxcapi_get_config_path(c
);
760 len
= strlen(c
->name
) + strlen(lxcpath
) + 9;
762 ret
= snprintf(dest
, len
, "%s/%s/rootfs", lxcpath
, c
->name
);
764 if (ret
< 0 || ret
>= len
)
767 bdev
= bdev_create(dest
, type
, c
->name
, specs
);
769 ERROR("Failed to create backing store type %s\n", type
);
773 lxcapi_set_config_item(c
, "lxc.rootfs", bdev
->src
);
775 /* if we are not root, chown the rootfs dir to root in the
778 if (geteuid() != 0) {
779 if (chown_mapped_root(bdev
->dest
, c
->lxc_conf
) < 0) {
780 ERROR("Error chowning %s to container root\n", bdev
->dest
);
790 * Given the '-t' template option to lxc-create, figure out what to
791 * do. If the template is a full executable path, use that. If it
792 * is something like 'sshd', then return $templatepath/lxc-sshd.
793 * On success return the template, on error return NULL.
795 static char *get_template_path(const char *t
)
800 if (t
[0] == '/' && access(t
, X_OK
) == 0) {
805 len
= strlen(LXCTEMPLATEDIR
) + strlen(t
) + strlen("/lxc-") + 1;
809 ret
= snprintf(tpath
, len
, "%s/lxc-%s", LXCTEMPLATEDIR
, t
);
810 if (ret
< 0 || ret
>= len
) {
814 if (access(tpath
, X_OK
) < 0) {
815 SYSERROR("bad template: %s\n", t
);
823 static char *lxcbasename(char *path
)
825 char *p
= path
+ strlen(path
) - 1;
826 while (*p
!= '/' && p
> path
)
831 static bool create_run_template(struct lxc_container
*c
, char *tpath
, bool quiet
,
841 SYSERROR("failed to fork task for container creation template\n");
845 if (pid
== 0) { // child
846 char *patharg
, *namearg
, *rootfsarg
, *src
;
847 struct bdev
*bdev
= NULL
;
849 int ret
, len
, nargs
= 0;
851 struct lxc_conf
*conf
= c
->lxc_conf
;
853 process_unlock(); // we're no longer sharing
858 open("/dev/zero", O_RDONLY
);
859 open("/dev/null", O_RDWR
);
860 open("/dev/null", O_RDWR
);
863 src
= c
->lxc_conf
->rootfs
.path
;
865 * for an overlayfs create, what the user wants is the template to fill
866 * in what will become the readonly lower layer. So don't mount for
869 if (strncmp(src
, "overlayfs:", 10) == 0) {
870 src
= overlayfs_getlower(src
+10);
872 bdev
= bdev_init(src
, c
->lxc_conf
->rootfs
.mount
, NULL
);
874 ERROR("Error opening rootfs");
878 if (geteuid() == 0) {
879 if (unshare(CLONE_NEWNS
) < 0) {
880 ERROR("error unsharing mounts");
883 if (detect_shared_rootfs()) {
884 if (mount("", "", NULL
, MS_SLAVE
|MS_REC
, 0)) {
885 SYSERROR("Failed to make / rslave to run template");
886 ERROR("Continuing...");
890 if (strcmp(bdev
->type
, "dir") != 0) {
891 if (geteuid() != 0) {
892 ERROR("non-root users can only create directory-backed containers");
895 if (bdev
->ops
->mount(bdev
) < 0) {
896 ERROR("Error mounting rootfs");
899 } else { // TODO come up with a better way here!
902 bdev
->dest
= strdup(bdev
->src
);
906 * create our new array, pre-pend the template name and
910 for (nargs
= 0; argv
[nargs
]; nargs
++) ;
911 nargs
+= 4; // template, path, rootfs and name args
913 newargv
= malloc(nargs
* sizeof(*newargv
));
916 newargv
[0] = lxcbasename(tpath
);
918 len
= strlen(c
->config_path
) + strlen(c
->name
) + strlen("--path=") + 2;
919 patharg
= malloc(len
);
922 ret
= snprintf(patharg
, len
, "--path=%s/%s", c
->config_path
, c
->name
);
923 if (ret
< 0 || ret
>= len
)
925 newargv
[1] = patharg
;
926 len
= strlen("--name=") + strlen(c
->name
) + 1;
927 namearg
= malloc(len
);
930 ret
= snprintf(namearg
, len
, "--name=%s", c
->name
);
931 if (ret
< 0 || ret
>= len
)
933 newargv
[2] = namearg
;
935 len
= strlen("--rootfs=") + 1 + strlen(bdev
->dest
);
936 rootfsarg
= malloc(len
);
939 ret
= snprintf(rootfsarg
, len
, "--rootfs=%s", bdev
->dest
);
940 if (ret
< 0 || ret
>= len
)
942 newargv
[3] = rootfsarg
;
944 /* add passed-in args */
946 for (i
= 4; i
< nargs
; i
++)
947 newargv
[i
] = argv
[i
-4];
949 /* add trailing NULL */
951 newargv
= realloc(newargv
, nargs
* sizeof(*newargv
));
954 newargv
[nargs
- 1] = NULL
;
957 * If we're running the template in a mapped userns, then
958 * we prepend the template command with:
959 * lxc-usernsexec <-m map1> ... <-m mapn> --
960 * and we append "--mapped-uid x", where x is the mapped uid
963 if (geteuid() != 0 && !lxc_list_empty(&conf
->id_map
)) {
966 char **n2
= malloc(n2args
* sizeof(*n2
));
971 SYSERROR("out of memory");
975 tpath
= "lxc-usernsexec";
976 n2
[0] = "lxc-usernsexec";
977 lxc_list_for_each(it
, &conf
->id_map
) {
980 n2
= realloc(n2
, n2args
* sizeof(char *));
984 n2
[n2args
-1] = malloc(200);
987 ret
= snprintf(n2
[n2args
-1], 200, "%c:%lu:%lu:%lu",
988 map
->idtype
== ID_TYPE_UID
? 'u' : 'g',
989 map
->nsid
, map
->hostid
, map
->range
);
990 if (ret
< 0 || ret
>= 200)
993 int hostid_mapped
= mapped_hostid(geteuid(), conf
);
994 int extraargs
= hostid_mapped
>= 0 ? 1 : 3;
995 n2
= realloc(n2
, (nargs
+ n2args
+ extraargs
) * sizeof(char *));
998 if (hostid_mapped
< 0) {
999 hostid_mapped
= find_unmapped_nsuid(conf
);
1000 n2
[n2args
++] = "-m";
1001 if (hostid_mapped
< 0) {
1002 ERROR("Could not find free uid to map");
1005 n2
[n2args
++] = malloc(200);
1006 if (!n2
[n2args
-1]) {
1007 SYSERROR("out of memory");
1010 ret
= snprintf(n2
[n2args
-1], 200, "u:%d:%d:1",
1011 hostid_mapped
, geteuid());
1012 if (ret
< 0 || ret
>= 200) {
1013 ERROR("string too long");
1017 n2
[n2args
++] = "--";
1018 for (i
= 0; i
< nargs
; i
++)
1019 n2
[i
+ n2args
] = newargv
[i
];
1021 // Finally add "--mapped-uid $uid" to tell template what to chown
1024 n2
= realloc(n2
, n2args
* sizeof(char *));
1026 SYSERROR("out of memory");
1029 // note n2[n2args-1] is NULL
1030 n2
[n2args
-3] = "--mapped-uid";
1031 snprintf(txtuid
, 20, "%d", hostid_mapped
);
1032 n2
[n2args
-2] = txtuid
;
1033 n2
[n2args
-1] = NULL
;
1038 execvp(tpath
, newargv
);
1039 SYSERROR("failed to execute template %s", tpath
);
1043 if (wait_for_pid(pid
) != 0) {
1044 ERROR("container creation template for %s failed\n", c
->name
);
1051 bool prepend_lxc_header(char *path
, const char *t
, char *const argv
[])
1059 unsigned char md_value
[SHA_DIGEST_LENGTH
];
1064 f
= fopen(path
, "r");
1069 if (fseek(f
, 0, SEEK_END
) < 0)
1071 if ((flen
= ftell(f
)) < 0)
1073 if (fseek(f
, 0, SEEK_SET
) < 0)
1075 if ((contents
= malloc(flen
+ 1)) == NULL
)
1077 if (fread(contents
, 1, flen
, f
) != flen
)
1078 goto out_free_contents
;
1080 contents
[flen
] = '\0';
1086 goto out_free_contents
;
1089 tpath
= get_template_path(t
);
1091 ERROR("bad template: %s\n", t
);
1092 goto out_free_contents
;
1095 ret
= sha1sum_file(tpath
, md_value
);
1097 ERROR("Error getting sha1sum of %s", tpath
);
1099 goto out_free_contents
;
1105 f
= fopen(path
, "w");
1108 SYSERROR("reopening config for writing");
1112 fprintf(f
, "# Template used to create this container: %s\n", t
);
1114 fprintf(f
, "# Parameters passed to the template:");
1116 fprintf(f
, " %s", *argv
);
1122 fprintf(f
, "# Template script checksum (SHA-1): ");
1123 for (i
=0; i
<SHA_DIGEST_LENGTH
; i
++)
1124 fprintf(f
, "%02x", md_value
[i
]);
1127 if (fwrite(contents
, 1, flen
, f
) != flen
) {
1128 SYSERROR("Writing original contents");
1148 SYSERROR("Error prepending header");
1154 static bool lxcapi_destroy(struct lxc_container
*c
);
1157 * create a container with the given parameters.
1158 * @c: container to be created. It has the lxcpath, name, and a starting
1159 * configuration already set
1160 * @t: the template to execute to instantiate the root filesystem and
1161 * adjust the configuration.
1162 * @bdevtype: backing store type to use. If NULL, dir will be used.
1163 * @specs: additional parameters for the backing store, i.e. LVM vg to
1166 * @argv: the arguments to pass to the template, terminated by NULL. If no
1167 * arguments, you can just pass NULL.
1169 static bool lxcapi_create(struct lxc_container
*c
, const char *t
,
1170 const char *bdevtype
, struct bdev_specs
*specs
, int flags
,
1182 tpath
= get_template_path(t
);
1184 ERROR("bad template: %s\n", t
);
1190 * If a template is passed in, and the rootfs already is defined in
1191 * the container config and exists, then * caller is trying to create
1192 * an existing container. Return an error, but do NOT delete the
1195 if (lxcapi_is_defined(c
) && c
->lxc_conf
&& c
->lxc_conf
->rootfs
.path
&&
1196 access(c
->lxc_conf
->rootfs
.path
, F_OK
) == 0 && tpath
) {
1197 ERROR("Container %s:%s already exists", c
->config_path
, c
->name
);
1202 if (!c
->load_config(c
, LXC_DEFAULT_CONFIG
)) {
1203 ERROR("Error loading default configuration file %s\n", LXC_DEFAULT_CONFIG
);
1208 if (!create_container_dir(c
))
1212 * either template or rootfs.path should be set.
1213 * if both template and rootfs.path are set, template is setup as rootfs.path.
1214 * container is already created if we have a config and rootfs.path is accessible
1216 if (!c
->lxc_conf
->rootfs
.path
&& !tpath
)
1217 /* no template passed in and rootfs does not exist: error */
1219 if (c
->lxc_conf
->rootfs
.path
&& access(c
->lxc_conf
->rootfs
.path
, F_OK
) != 0)
1220 /* rootfs passed into configuration, but does not exist: error */
1222 if (lxcapi_is_defined(c
) && c
->lxc_conf
->rootfs
.path
&& !tpath
) {
1223 /* Rootfs already existed, user just wanted to save the
1224 * loaded configuration */
1229 /* Mark that this container is being created */
1230 if ((partial_fd
= create_partial(c
)) < 0)
1233 /* no need to get disk lock bc we have the partial locked */
1236 * Create the backing store
1237 * Note we can't do this in the same task as we use to execute the
1238 * template because of the way zfs works.
1239 * After you 'zfs create', zfs mounts the fs only in the initial
1244 SYSERROR("failed to fork task for container creation template\n");
1248 if (pid
== 0) { // child
1249 struct bdev
*bdev
= NULL
;
1251 process_unlock(); // we're no longer sharing
1252 if (!(bdev
= do_bdev_create(c
, bdevtype
, specs
))) {
1253 ERROR("Error creating backing store type %s for %s",
1254 bdevtype
? bdevtype
: "(none)", c
->name
);
1258 /* save config file again to store the new rootfs location */
1259 if (!c
->save_config(c
, NULL
)) {
1260 ERROR("failed to save starting configuration for %s\n", c
->name
);
1261 // parent task won't see bdev in config so we delete it
1262 bdev
->ops
->umount(bdev
);
1263 bdev
->ops
->destroy(bdev
);
1268 if (wait_for_pid(pid
) != 0)
1271 /* reload config to get the rootfs */
1273 lxc_conf_free(c
->lxc_conf
);
1275 if (!load_config_locked(c
, c
->configfile
))
1278 if (!create_run_template(c
, tpath
, !!(flags
& LXC_CREATE_QUIET
), argv
))
1281 // now clear out the lxc_conf we have, reload from the created
1284 lxc_conf_free(c
->lxc_conf
);
1288 if (!prepend_lxc_header(c
->configfile
, tpath
, argv
)) {
1289 ERROR("Error prepending header to configuration file");
1293 ret
= load_config_locked(c
, c
->configfile
);
1296 if (partial_fd
>= 0)
1297 remove_partial(c
, partial_fd
);
1307 static bool lxcapi_reboot(struct lxc_container
*c
)
1313 if (!c
->is_running(c
))
1315 pid
= c
->init_pid(c
);
1318 if (kill(pid
, SIGINT
) < 0)
1324 static bool lxcapi_shutdown(struct lxc_container
*c
, int timeout
)
1334 if (!c
->is_running(c
))
1336 pid
= c
->init_pid(c
);
1340 retv
= c
->wait(c
, "STOPPED", timeout
);
1341 if (!retv
&& timeout
> 0) {
1343 retv
= c
->wait(c
, "STOPPED", 0); // 0 means don't wait
1348 static bool lxcapi_createl(struct lxc_container
*c
, const char *t
,
1349 const char *bdevtype
, struct bdev_specs
*specs
, int flags
, ...)
1359 * since we're going to wait for create to finish, I don't think we
1360 * need to get a copy of the arguments.
1362 va_start(ap
, flags
);
1363 args
= lxc_va_arg_list_to_argv(ap
, 0, 0);
1366 ERROR("Memory allocation error.");
1370 bret
= c
->create(c
, t
, bdevtype
, specs
, flags
, args
);
1377 static bool lxcapi_clear_config_item(struct lxc_container
*c
, const char *key
)
1381 if (!c
|| !c
->lxc_conf
)
1383 if (container_mem_lock(c
))
1385 ret
= lxc_clear_config_item(c
->lxc_conf
, key
);
1386 container_mem_unlock(c
);
1390 static inline void exit_from_ns(struct lxc_container
*c
, int *old_netns
, int *new_netns
) {
1391 /* Switch back to original netns */
1392 if (*old_netns
>= 0 && setns(*old_netns
, CLONE_NEWNET
))
1393 SYSERROR("failed to setns");
1395 if (*new_netns
>= 0)
1397 if (*old_netns
>= 0)
1402 static inline bool enter_to_ns(struct lxc_container
*c
, int *old_netns
, int *new_netns
) {
1404 char new_netns_path
[MAXPATHLEN
];
1406 if (!c
->is_running(c
))
1409 /* Save reference to old netns */
1411 *old_netns
= open("/proc/self/ns/net", O_RDONLY
);
1413 if (*old_netns
< 0) {
1414 SYSERROR("failed to open /proc/self/ns/net");
1418 /* Switch to new netns */
1419 ret
= snprintf(new_netns_path
, MAXPATHLEN
, "/proc/%d/ns/net", c
->init_pid(c
));
1420 if (ret
< 0 || ret
>= MAXPATHLEN
)
1424 *new_netns
= open(new_netns_path
, O_RDONLY
);
1426 if (*new_netns
< 0) {
1427 SYSERROR("failed to open %s", new_netns_path
);
1431 if (setns(*new_netns
, CLONE_NEWNET
)) {
1432 SYSERROR("failed to setns");
1437 exit_from_ns(c
, old_netns
, new_netns
);
1441 // used by qsort and bsearch functions for comparing names
1442 static inline int string_cmp(char **first
, char **second
)
1444 return strcmp(*first
, *second
);
1447 // used by qsort and bsearch functions for comparing container names
1448 static inline int container_cmp(struct lxc_container
**first
, struct lxc_container
**second
)
1450 return strcmp((*first
)->name
, (*second
)->name
);
1453 static bool add_to_array(char ***names
, char *cname
, int pos
)
1455 char **newnames
= realloc(*names
, (pos
+1) * sizeof(char *));
1457 ERROR("Out of memory");
1462 newnames
[pos
] = strdup(cname
);
1466 // sort the arrray as we will use binary search on it
1467 qsort(newnames
, pos
+ 1, sizeof(char *), (int (*)(const void *,const void *))string_cmp
);
1472 static bool add_to_clist(struct lxc_container
***list
, struct lxc_container
*c
, int pos
, bool sort
)
1474 struct lxc_container
**newlist
= realloc(*list
, (pos
+1) * sizeof(struct lxc_container
*));
1476 ERROR("Out of memory");
1483 // sort the arrray as we will use binary search on it
1485 qsort(newlist
, pos
+ 1, sizeof(struct lxc_container
*), (int (*)(const void *,const void *))container_cmp
);
1490 static char** get_from_array(char ***names
, char *cname
, int size
)
1492 return (char **)bsearch(&cname
, *names
, size
, sizeof(char *), (int (*)(const void *, const void *))string_cmp
);
1496 static bool array_contains(char ***names
, char *cname
, int size
) {
1497 if(get_from_array(names
, cname
, size
) != NULL
)
1502 static bool remove_from_array(char ***names
, char *cname
, int size
)
1504 char **result
= get_from_array(names
, cname
, size
);
1505 if (result
!= NULL
) {
1512 static char** lxcapi_get_interfaces(struct lxc_container
*c
)
1515 struct ifaddrs
*interfaceArray
= NULL
, *tempIfAddr
= NULL
;
1516 char **interfaces
= NULL
;
1517 int old_netns
= -1, new_netns
= -1;
1519 if (!enter_to_ns(c
, &old_netns
, &new_netns
))
1522 /* Grab the list of interfaces */
1523 if (getifaddrs(&interfaceArray
)) {
1524 SYSERROR("failed to get interfaces list");
1528 /* Iterate through the interfaces */
1529 for (tempIfAddr
= interfaceArray
; tempIfAddr
!= NULL
; tempIfAddr
= tempIfAddr
->ifa_next
) {
1530 if (array_contains(&interfaces
, tempIfAddr
->ifa_name
, count
))
1533 if(!add_to_array(&interfaces
, tempIfAddr
->ifa_name
, count
))
1540 freeifaddrs(interfaceArray
);
1542 exit_from_ns(c
, &old_netns
, &new_netns
);
1544 /* Append NULL to the array */
1546 interfaces
= (char **)lxc_append_null_to_array((void **)interfaces
, count
);
1551 for(i
=0;i
<count
;i
++)
1552 free(interfaces
[i
]);
1558 static char** lxcapi_get_ips(struct lxc_container
*c
, char* interface
, char* family
, int scope
)
1561 struct ifaddrs
*interfaceArray
= NULL
, *tempIfAddr
= NULL
;
1562 char addressOutputBuffer
[INET6_ADDRSTRLEN
];
1563 void *tempAddrPtr
= NULL
;
1564 char **addresses
= NULL
;
1565 char *address
= NULL
;
1566 int old_netns
= -1, new_netns
= -1;
1568 if (!enter_to_ns(c
, &old_netns
, &new_netns
))
1571 /* Grab the list of interfaces */
1572 if (getifaddrs(&interfaceArray
)) {
1573 SYSERROR("failed to get interfaces list");
1577 /* Iterate through the interfaces */
1578 for (tempIfAddr
= interfaceArray
; tempIfAddr
!= NULL
; tempIfAddr
= tempIfAddr
->ifa_next
) {
1579 if (tempIfAddr
->ifa_addr
== NULL
)
1582 if(tempIfAddr
->ifa_addr
->sa_family
== AF_INET
) {
1583 if (family
&& strcmp(family
, "inet"))
1585 tempAddrPtr
= &((struct sockaddr_in
*)tempIfAddr
->ifa_addr
)->sin_addr
;
1588 if (family
&& strcmp(family
, "inet6"))
1591 if (((struct sockaddr_in6
*)tempIfAddr
->ifa_addr
)->sin6_scope_id
!= scope
)
1594 tempAddrPtr
= &((struct sockaddr_in6
*)tempIfAddr
->ifa_addr
)->sin6_addr
;
1597 if (interface
&& strcmp(interface
, tempIfAddr
->ifa_name
))
1599 else if (!interface
&& strcmp("lo", tempIfAddr
->ifa_name
) == 0)
1602 address
= (char *)inet_ntop(tempIfAddr
->ifa_addr
->sa_family
,
1604 addressOutputBuffer
,
1605 sizeof(addressOutputBuffer
));
1609 if(!add_to_array(&addresses
, address
, count
))
1616 freeifaddrs(interfaceArray
);
1618 exit_from_ns(c
, &old_netns
, &new_netns
);
1620 /* Append NULL to the array */
1622 addresses
= (char **)lxc_append_null_to_array((void **)addresses
, count
);
1627 for(i
=0;i
<count
;i
++)
1635 static int lxcapi_get_config_item(struct lxc_container
*c
, const char *key
, char *retv
, int inlen
)
1639 if (!c
|| !c
->lxc_conf
)
1641 if (container_mem_lock(c
))
1643 ret
= lxc_get_config_item(c
->lxc_conf
, key
, retv
, inlen
);
1644 container_mem_unlock(c
);
1648 static int lxcapi_get_keys(struct lxc_container
*c
, const char *key
, char *retv
, int inlen
)
1651 return lxc_listconfigs(retv
, inlen
);
1653 * Support 'lxc.network.<idx>', i.e. 'lxc.network.0'
1654 * This is an intelligent result to show which keys are valid given
1655 * the type of nic it is
1657 if (!c
|| !c
->lxc_conf
)
1659 if (container_mem_lock(c
))
1662 if (strncmp(key
, "lxc.network.", 12) == 0)
1663 ret
= lxc_list_nicconfigs(c
->lxc_conf
, key
, retv
, inlen
);
1664 container_mem_unlock(c
);
1668 static bool lxcapi_save_config(struct lxc_container
*c
, const char *alt_file
)
1671 bool ret
= false, need_disklock
= false;
1675 alt_file
= c
->configfile
;
1677 return false; // should we write to stdout if no file is specified?
1679 // If we haven't yet loaded a config, load the stock config
1681 if (!c
->load_config(c
, LXC_DEFAULT_CONFIG
)) {
1682 ERROR("Error loading default configuration file %s while saving %s\n", LXC_DEFAULT_CONFIG
, c
->name
);
1687 if (!create_container_dir(c
))
1691 * If we're writing to the container's config file, take the
1692 * disk lock. Otherwise just take the memlock to protect the
1693 * struct lxc_container while we're traversing it.
1695 if (strcmp(c
->configfile
, alt_file
) == 0)
1696 need_disklock
= true;
1699 lret
= container_disk_lock(c
);
1701 lret
= container_mem_lock(c
);
1707 fout
= fopen(alt_file
, "w");
1711 write_config(fout
, c
->lxc_conf
);
1719 container_disk_unlock(c
);
1721 container_mem_unlock(c
);
1725 static bool mod_rdep(struct lxc_container
*c
, bool inc
)
1727 char path
[MAXPATHLEN
];
1732 if (container_disk_lock(c
))
1734 ret
= snprintf(path
, MAXPATHLEN
, "%s/%s/lxc_snapshots", c
->config_path
,
1736 if (ret
< 0 || ret
> MAXPATHLEN
)
1739 f
= fopen(path
, "r");
1742 ret
= fscanf(f
, "%d", &v
);
1747 ERROR("Corrupted file %s", path
);
1753 f
= fopen(path
, "w");
1757 if (fprintf(f
, "%d\n", v
) < 0) {
1758 ERROR("Error writing new snapshots value");
1768 SYSERROR("Error writing to or closing snapshots file");
1775 container_disk_unlock(c
);
1779 static void strip_newline(char *p
)
1781 size_t len
= strlen(p
);
1784 if (p
[len
-1] == '\n')
1788 static void mod_all_rdeps(struct lxc_container
*c
, bool inc
)
1790 struct lxc_container
*p
;
1791 char *lxcpath
= NULL
, *lxcname
= NULL
, path
[MAXPATHLEN
];
1792 size_t pathlen
= 0, namelen
= 0;
1796 ret
= snprintf(path
, MAXPATHLEN
, "%s/%s/lxc_rdepends",
1797 c
->config_path
, c
->name
);
1798 if (ret
< 0 || ret
>= MAXPATHLEN
) {
1799 ERROR("Path name too long");
1803 f
= fopen(path
, "r");
1807 while (getline(&lxcpath
, &pathlen
, f
) != -1) {
1808 if (getline(&lxcname
, &namelen
, f
) == -1) {
1809 ERROR("badly formatted file %s\n", path
);
1812 strip_newline(lxcpath
);
1813 strip_newline(lxcname
);
1814 if ((p
= lxc_container_new(lxcname
, lxcpath
)) == NULL
) {
1815 ERROR("Unable to find dependent container %s:%s",
1819 if (!mod_rdep(p
, inc
))
1820 ERROR("Failed to increase numsnapshots for %s:%s",
1822 lxc_container_put(p
);
1825 if (lxcpath
) free(lxcpath
);
1826 if (lxcname
) free(lxcname
);
1832 static bool has_snapshots(struct lxc_container
*c
)
1834 char path
[MAXPATHLEN
];
1839 ret
= snprintf(path
, MAXPATHLEN
, "%s/%s/lxc_snapshots", c
->config_path
,
1841 if (ret
< 0 || ret
> MAXPATHLEN
)
1844 f
= fopen(path
, "r");
1848 ret
= fscanf(f
, "%d", &v
);
1860 // do we want the api to support --force, or leave that to the caller?
1861 static bool lxcapi_destroy(struct lxc_container
*c
)
1863 struct bdev
*r
= NULL
;
1866 if (!c
|| !lxcapi_is_defined(c
))
1869 if (container_disk_lock(c
))
1872 if (!is_stopped(c
)) {
1873 // we should queue some sort of error - in c->error_string?
1874 ERROR("container %s is not stopped", c
->name
);
1878 if (c
->lxc_conf
&& has_snapshots(c
)) {
1879 ERROR("container %s has dependent snapshots", c
->name
);
1883 if (c
->lxc_conf
&& c
->lxc_conf
->rootfs
.path
&& c
->lxc_conf
->rootfs
.mount
)
1884 r
= bdev_init(c
->lxc_conf
->rootfs
.path
, c
->lxc_conf
->rootfs
.mount
, NULL
);
1886 if (r
->ops
->destroy(r
) < 0) {
1888 ERROR("Error destroying rootfs for %s", c
->name
);
1894 mod_all_rdeps(c
, false);
1896 const char *p1
= lxcapi_get_config_path(c
);
1897 char *path
= alloca(strlen(p1
) + strlen(c
->name
) + 2);
1898 sprintf(path
, "%s/%s", p1
, c
->name
);
1899 if (lxc_rmdir_onedev(path
) < 0) {
1900 ERROR("Error destroying container directory for %s", c
->name
);
1906 container_disk_unlock(c
);
1910 static bool set_config_item_locked(struct lxc_container
*c
, const char *key
, const char *v
)
1912 struct lxc_config_t
*config
;
1915 c
->lxc_conf
= lxc_conf_init();
1918 config
= lxc_getconfig(key
);
1921 return (0 == config
->cb(key
, v
, c
->lxc_conf
));
1924 static bool lxcapi_set_config_item(struct lxc_container
*c
, const char *key
, const char *v
)
1931 if (container_mem_lock(c
))
1934 b
= set_config_item_locked(c
, key
, v
);
1936 container_mem_unlock(c
);
1940 static char *lxcapi_config_file_name(struct lxc_container
*c
)
1942 if (!c
|| !c
->configfile
)
1944 return strdup(c
->configfile
);
1947 static const char *lxcapi_get_config_path(struct lxc_container
*c
)
1949 if (!c
|| !c
->config_path
)
1951 return (const char *)(c
->config_path
);
1956 * Just recalculate the c->configfile based on the
1957 * c->config_path, which must be set.
1958 * The lxc_container must be locked or not yet public.
1960 static bool set_config_filename(struct lxc_container
*c
)
1965 if (!c
->config_path
)
1968 /* $lxc_path + "/" + c->name + "/" + "config" + '\0' */
1969 len
= strlen(c
->config_path
) + strlen(c
->name
) + strlen("config") + 3;
1970 newpath
= malloc(len
);
1974 ret
= snprintf(newpath
, len
, "%s/%s/config", c
->config_path
, c
->name
);
1975 if (ret
< 0 || ret
>= len
) {
1976 fprintf(stderr
, "Error printing out config file name\n");
1982 free(c
->configfile
);
1983 c
->configfile
= newpath
;
1988 static bool lxcapi_set_config_path(struct lxc_container
*c
, const char *path
)
1992 char *oldpath
= NULL
;
1997 if (container_mem_lock(c
))
2002 ERROR("Out of memory setting new lxc path");
2008 oldpath
= c
->config_path
;
2011 /* Since we've changed the config path, we have to change the
2012 * config file name too */
2013 if (!set_config_filename(c
)) {
2014 ERROR("Out of memory setting new config filename");
2016 free(c
->config_path
);
2017 c
->config_path
= oldpath
;
2023 container_mem_unlock(c
);
2028 static bool lxcapi_set_cgroup_item(struct lxc_container
*c
, const char *subsys
, const char *value
)
2038 if (container_disk_lock(c
))
2041 ret
= lxc_cgroup_set(subsys
, value
, c
->name
, c
->config_path
);
2043 container_disk_unlock(c
);
2047 static int lxcapi_get_cgroup_item(struct lxc_container
*c
, const char *subsys
, char *retv
, int inlen
)
2057 if (container_disk_lock(c
))
2060 ret
= lxc_cgroup_get(subsys
, retv
, inlen
, c
->name
, c
->config_path
);
2062 container_disk_unlock(c
);
2066 const char *lxc_get_default_config_path(void)
2068 return default_lxc_path();
2071 const char *lxc_get_default_lvm_vg(void)
2073 return default_lvm_vg();
2076 const char *lxc_get_default_lvm_thin_pool(void)
2078 return default_lvm_thin_pool();
2081 const char *lxc_get_default_zfs_root(void)
2083 return default_zfs_root();
2086 const char *lxc_get_version(void)
2088 return lxc_version();
2091 static int copy_file(char *old
, char *new)
2098 if (file_exists(new)) {
2099 ERROR("copy destination %s exists", new);
2102 ret
= stat(old
, &sbuf
);
2104 INFO("Error stat'ing %s", old
);
2109 in
= open(old
, O_RDONLY
);
2112 SYSERROR("Error opening original file %s", old
);
2116 out
= open(new, O_CREAT
| O_EXCL
| O_WRONLY
, 0644);
2119 SYSERROR("Error opening new file %s", new);
2127 len
= read(in
, buf
, 8096);
2129 SYSERROR("Error reading old file %s", old
);
2134 ret
= write(out
, buf
, len
);
2135 if (ret
< len
) { // should we retry?
2136 SYSERROR("Error: write to new file %s was interrupted", new);
2145 // we set mode, but not owner/group
2146 ret
= chmod(new, sbuf
.st_mode
);
2148 SYSERROR("Error setting mode on %s", new);
2162 static int copyhooks(struct lxc_container
*oldc
, struct lxc_container
*c
)
2166 struct lxc_list
*it
;
2168 for (i
=0; i
<NUM_LXC_HOOKS
; i
++) {
2169 lxc_list_for_each(it
, &c
->lxc_conf
->hooks
[i
]) {
2170 char *hookname
= it
->elem
;
2171 char *fname
= strrchr(hookname
, '/');
2172 char tmppath
[MAXPATHLEN
];
2173 if (!fname
) // relative path - we don't support, but maybe we should
2175 // copy the script, and change the entry in confile
2176 ret
= snprintf(tmppath
, MAXPATHLEN
, "%s/%s/%s",
2177 c
->config_path
, c
->name
, fname
+1);
2178 if (ret
< 0 || ret
>= MAXPATHLEN
)
2180 ret
= copy_file(it
->elem
, tmppath
);
2184 it
->elem
= strdup(tmppath
);
2186 ERROR("out of memory copying hook path");
2192 c
->save_config(c
, NULL
);
2196 static void new_hwaddr(char *hwaddr
)
2200 f
= fopen("/dev/urandom", "r");
2204 int ret
= fread(&seed
, sizeof(seed
), 1, f
);
2213 snprintf(hwaddr
, 18, "00:16:3e:%02x:%02x:%02x",
2214 rand() % 255, rand() % 255, rand() % 255);
2217 static void network_new_hwaddrs(struct lxc_container
*c
)
2219 struct lxc_list
*it
;
2221 lxc_list_for_each(it
, &c
->lxc_conf
->network
) {
2222 struct lxc_netdev
*n
= it
->elem
;
2224 new_hwaddr(n
->hwaddr
);
2228 static int copy_fstab(struct lxc_container
*oldc
, struct lxc_container
*c
)
2230 char newpath
[MAXPATHLEN
];
2231 char *oldpath
= oldc
->lxc_conf
->fstab
;
2237 char *p
= strrchr(oldpath
, '/');
2240 ret
= snprintf(newpath
, MAXPATHLEN
, "%s/%s%s",
2241 c
->config_path
, c
->name
, p
);
2242 if (ret
< 0 || ret
>= MAXPATHLEN
) {
2243 ERROR("error printing new path for %s", oldpath
);
2246 if (file_exists(newpath
)) {
2247 ERROR("error: fstab file %s exists", newpath
);
2251 if (copy_file(oldpath
, newpath
) < 0) {
2252 ERROR("error: copying %s to %s", oldpath
, newpath
);
2255 free(c
->lxc_conf
->fstab
);
2256 c
->lxc_conf
->fstab
= strdup(newpath
);
2257 if (!c
->lxc_conf
->fstab
) {
2258 ERROR("error: allocating pathname");
2265 static void copy_rdepends(struct lxc_container
*c
, struct lxc_container
*c0
)
2267 char path0
[MAXPATHLEN
], path1
[MAXPATHLEN
];
2270 ret
= snprintf(path0
, MAXPATHLEN
, "%s/%s/lxc_rdepends", c0
->config_path
,
2272 if (ret
< 0 || ret
>= MAXPATHLEN
) {
2273 WARN("Error copying reverse dependencies");
2276 ret
= snprintf(path1
, MAXPATHLEN
, "%s/%s/lxc_rdepends", c
->config_path
,
2278 if (ret
< 0 || ret
>= MAXPATHLEN
) {
2279 WARN("Error copying reverse dependencies");
2282 if (copy_file(path0
, path1
) < 0) {
2283 INFO("Error copying reverse dependencies");
2288 static bool add_rdepends(struct lxc_container
*c
, struct lxc_container
*c0
)
2291 char path
[MAXPATHLEN
];
2295 ret
= snprintf(path
, MAXPATHLEN
, "%s/%s/lxc_rdepends", c
->config_path
,
2297 if (ret
< 0 || ret
>= MAXPATHLEN
)
2300 f
= fopen(path
, "a");
2305 // if anything goes wrong, just return an error
2306 if (fprintf(f
, "%s\n%s\n", c0
->config_path
, c0
->name
) < 0)
2315 static int copy_storage(struct lxc_container
*c0
, struct lxc_container
*c
,
2316 const char *newtype
, int flags
, const char *bdevdata
, unsigned long newsize
)
2321 bdev
= bdev_copy(c0
->lxc_conf
->rootfs
.path
, c0
->name
, c
->name
,
2322 c0
->config_path
, c
->config_path
, newtype
, !!(flags
& LXC_CLONE_SNAPSHOT
),
2323 bdevdata
, newsize
, &need_rdep
);
2325 ERROR("Error copying storage");
2328 free(c
->lxc_conf
->rootfs
.path
);
2329 c
->lxc_conf
->rootfs
.path
= strdup(bdev
->src
);
2331 if (!c
->lxc_conf
->rootfs
.path
) {
2332 ERROR("Out of memory while setting storage path");
2335 if (flags
& LXC_CLONE_SNAPSHOT
)
2336 copy_rdepends(c
, c0
);
2338 if (!add_rdepends(c
, c0
))
2339 WARN("Error adding reverse dependency from %s to %s",
2343 mod_all_rdeps(c
, true);
2348 static int clone_update_rootfs(struct lxc_container
*c0
,
2349 struct lxc_container
*c
, int flags
,
2353 char path
[MAXPATHLEN
];
2357 struct lxc_conf
*conf
= c
->lxc_conf
;
2359 /* update hostname in rootfs */
2360 /* we're going to mount, so run in a clean namespace to simplify cleanup */
2366 return wait_for_pid(pid
);
2368 process_unlock(); // we're no longer sharing
2369 bdev
= bdev_init(c
->lxc_conf
->rootfs
.path
, c
->lxc_conf
->rootfs
.mount
, NULL
);
2372 if (strcmp(bdev
->type
, "dir") != 0) {
2373 if (unshare(CLONE_NEWNS
) < 0) {
2374 ERROR("error unsharing mounts");
2377 if (bdev
->ops
->mount(bdev
) < 0)
2379 } else { // TODO come up with a better way
2382 bdev
->dest
= strdup(bdev
->src
);
2385 if (!lxc_list_empty(&conf
->hooks
[LXCHOOK_CLONE
])) {
2386 /* Start of environment variable setup for hooks */
2387 if (setenv("LXC_SRC_NAME", c0
->name
, 1)) {
2388 SYSERROR("failed to set environment variable for source container name");
2390 if (setenv("LXC_NAME", c
->name
, 1)) {
2391 SYSERROR("failed to set environment variable for container name");
2393 if (setenv("LXC_CONFIG_FILE", conf
->rcfile
, 1)) {
2394 SYSERROR("failed to set environment variable for config path");
2396 if (setenv("LXC_ROOTFS_MOUNT", conf
->rootfs
.mount
, 1)) {
2397 SYSERROR("failed to set environment variable for rootfs mount");
2399 if (setenv("LXC_ROOTFS_PATH", conf
->rootfs
.path
, 1)) {
2400 SYSERROR("failed to set environment variable for rootfs mount");
2403 if (run_lxc_hooks(c
->name
, "clone", conf
, c
->get_config_path(c
), hookargs
)) {
2404 ERROR("Error executing clone hook for %s", c
->name
);
2409 if (!(flags
& LXC_CLONE_KEEPNAME
)) {
2410 ret
= snprintf(path
, MAXPATHLEN
, "%s/etc/hostname", bdev
->dest
);
2411 if (ret
< 0 || ret
>= MAXPATHLEN
)
2413 if (!file_exists(path
))
2415 if (!(fout
= fopen(path
, "w"))) {
2416 SYSERROR("unable to open %s: ignoring\n", path
);
2419 if (fprintf(fout
, "%s", c
->name
) < 0)
2421 if (fclose(fout
) < 0)
2428 * We want to support:
2429 sudo lxc-clone -o o1 -n n1 -s -L|-fssize fssize -v|--vgname vgname \
2430 -p|--lvprefix lvprefix -t|--fstype fstype -B backingstore
2432 -s [ implies overlayfs]
2436 only rootfs gets converted (copied/snapshotted) on clone.
2439 static int create_file_dirname(char *path
)
2441 char *p
= strrchr(path
, '/');
2447 ret
= mkdir(path
, 0755);
2448 if (ret
&& errno
!= EEXIST
)
2449 SYSERROR("creating container path %s\n", path
);
2454 struct lxc_container
*lxcapi_clone(struct lxc_container
*c
, const char *newname
,
2455 const char *lxcpath
, int flags
,
2456 const char *bdevtype
, const char *bdevdata
, unsigned long newsize
,
2459 struct lxc_container
*c2
= NULL
;
2460 char newpath
[MAXPATHLEN
];
2461 int ret
, storage_copied
= 0;
2465 if (!c
|| !c
->is_defined(c
))
2468 if (container_mem_lock(c
))
2471 if (!is_stopped(c
)) {
2472 ERROR("error: Original container (%s) is running", c
->name
);
2476 // Make sure the container doesn't yet exist.
2477 n
= newname
? newname
: c
->name
;
2478 l
= lxcpath
? lxcpath
: c
->get_config_path(c
);
2479 ret
= snprintf(newpath
, MAXPATHLEN
, "%s/%s/config", l
, n
);
2480 if (ret
< 0 || ret
>= MAXPATHLEN
) {
2481 SYSERROR("clone: failed making config pathname");
2484 if (file_exists(newpath
)) {
2485 ERROR("error: clone: %s exists", newpath
);
2489 ret
= create_file_dirname(newpath
);
2490 if (ret
< 0 && errno
!= EEXIST
) {
2491 ERROR("Error creating container dir for %s", newpath
);
2495 // copy the configuration, tweak it as needed,
2497 fout
= fopen(newpath
, "w");
2500 SYSERROR("open %s", newpath
);
2503 write_config(fout
, c
->lxc_conf
);
2508 sprintf(newpath
, "%s/%s/rootfs", l
, n
);
2509 if (mkdir(newpath
, 0755) < 0) {
2510 SYSERROR("error creating %s", newpath
);
2514 c2
= lxc_container_new(n
, l
);
2516 ERROR("clone: failed to create new container (%s %s)", n
, l
);
2521 if (!set_config_item_locked(c2
, "lxc.utsname", newname
)) {
2522 ERROR("Error setting new hostname");
2527 // copy hooks if requested
2528 if (flags
& LXC_CLONE_COPYHOOKS
) {
2529 ret
= copyhooks(c
, c2
);
2531 ERROR("error copying hooks");
2536 if (copy_fstab(c
, c2
) < 0) {
2537 ERROR("error copying fstab");
2542 if (!(flags
& LXC_CLONE_KEEPMACADDR
))
2543 network_new_hwaddrs(c2
);
2545 // copy/snapshot rootfs's
2546 ret
= copy_storage(c
, c2
, bdevtype
, flags
, bdevdata
, newsize
);
2550 // We've now successfully created c2's storage, so clear it out if we
2554 if (!c2
->save_config(c2
, NULL
))
2557 if (clone_update_rootfs(c
, c2
, flags
, hookargs
) < 0)
2560 // TODO: update c's lxc.snapshot = count
2561 container_mem_unlock(c
);
2565 container_mem_unlock(c
);
2567 if (!storage_copied
)
2568 c2
->lxc_conf
->rootfs
.path
= NULL
;
2570 lxc_container_put(c2
);
2576 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
)
2581 return lxc_attach(c
->name
, c
->config_path
, exec_function
, exec_payload
, options
, attached_process
);
2584 static int lxcapi_attach_run_wait(struct lxc_container
*c
, lxc_attach_options_t
*options
, const char *program
, const char * const argv
[])
2586 lxc_attach_command_t command
;
2593 command
.program
= (char*)program
;
2594 command
.argv
= (char**)argv
;
2595 r
= lxc_attach(c
->name
, c
->config_path
, lxc_attach_run_command
, &command
, options
, &pid
);
2600 return lxc_wait_for_pid_status(pid
);
2603 int get_next_index(const char *lxcpath
, char *cname
)
2609 fname
= alloca(strlen(lxcpath
) + 20);
2611 sprintf(fname
, "%s/snap%d", lxcpath
, i
);
2612 ret
= stat(fname
, &sb
);
2619 static int lxcapi_snapshot(struct lxc_container
*c
, char *commentfile
)
2622 struct lxc_container
*c2
;
2623 char snappath
[MAXPATHLEN
], newname
[20];
2625 // /var/lib/lxc -> /var/lib/lxcsnaps \0
2626 ret
= snprintf(snappath
, MAXPATHLEN
, "%ssnaps/%s", c
->config_path
, c
->name
);
2627 if (ret
< 0 || ret
>= MAXPATHLEN
)
2629 i
= get_next_index(snappath
, c
->name
);
2631 if (mkdir_p(snappath
, 0755) < 0) {
2632 ERROR("Failed to create snapshot directory %s", snappath
);
2636 ret
= snprintf(newname
, 20, "snap%d", i
);
2637 if (ret
< 0 || ret
>= 20)
2640 flags
= LXC_CLONE_SNAPSHOT
| LXC_CLONE_KEEPMACADDR
| LXC_CLONE_KEEPNAME
;
2641 c2
= c
->clone(c
, newname
, snappath
, flags
, NULL
, NULL
, 0, NULL
);
2643 ERROR("clone of %s:%s failed\n", c
->config_path
, c
->name
);
2647 lxc_container_put(c2
);
2649 // Now write down the creation time
2656 tm_info
= localtime(&timer
);
2658 strftime(buffer
, 25, "%Y:%m:%d %H:%M:%S", tm_info
);
2660 char *dfnam
= alloca(strlen(snappath
) + strlen(newname
) + 5);
2661 sprintf(dfnam
, "%s/%s/ts", snappath
, newname
);
2663 f
= fopen(dfnam
, "w");
2666 ERROR("Failed to open %s\n", dfnam
);
2669 if (fprintf(f
, "%s", buffer
) < 0) {
2670 SYSERROR("Writing timestamp");
2678 SYSERROR("Writing timestamp");
2683 // $p / $name / comment \0
2684 int len
= strlen(snappath
) + strlen(newname
) + 10;
2685 char *path
= alloca(len
);
2686 sprintf(path
, "%s/%s/comment", snappath
, newname
);
2687 return copy_file(commentfile
, path
) < 0 ? -1 : i
;
2693 static void lxcsnap_free(struct lxc_snapshot
*s
)
2697 if (s
->comment_pathname
)
2698 free(s
->comment_pathname
);
2705 static char *get_snapcomment_path(char* snappath
, char *name
)
2707 // $snappath/$name/comment
2708 int ret
, len
= strlen(snappath
) + strlen(name
) + 10;
2709 char *s
= malloc(len
);
2712 ret
= snprintf(s
, len
, "%s/%s/comment", snappath
, name
);
2713 if (ret
< 0 || ret
>= len
) {
2721 static char *get_timestamp(char* snappath
, char *name
)
2723 char path
[MAXPATHLEN
], *s
= NULL
;
2727 ret
= snprintf(path
, MAXPATHLEN
, "%s/%s/ts", snappath
, name
);
2728 if (ret
< 0 || ret
>= MAXPATHLEN
)
2731 fin
= fopen(path
, "r");
2735 (void) fseek(fin
, 0, SEEK_END
);
2737 (void) fseek(fin
, 0, SEEK_SET
);
2742 if (fread(s
, 1, len
, fin
) != len
) {
2743 SYSERROR("reading timestamp");
2755 static int lxcapi_snapshot_list(struct lxc_container
*c
, struct lxc_snapshot
**ret_snaps
)
2757 char snappath
[MAXPATHLEN
], path2
[MAXPATHLEN
];
2758 int dirlen
, count
= 0, ret
;
2759 struct dirent dirent
, *direntp
;
2760 struct lxc_snapshot
*snaps
=NULL
, *nsnaps
;
2763 if (!c
|| !lxcapi_is_defined(c
))
2765 // snappath is ${lxcpath}snaps/${lxcname}/
2766 dirlen
= snprintf(snappath
, MAXPATHLEN
, "%ssnaps/%s", c
->config_path
, c
->name
);
2767 if (dirlen
< 0 || dirlen
>= MAXPATHLEN
) {
2768 ERROR("path name too long");
2772 dir
= opendir(snappath
);
2775 INFO("failed to open %s - assuming no snapshots", snappath
);
2779 while (!readdir_r(dir
, &dirent
, &direntp
)) {
2783 if (!strcmp(direntp
->d_name
, "."))
2786 if (!strcmp(direntp
->d_name
, ".."))
2789 ret
= snprintf(path2
, MAXPATHLEN
, "%s/%s/config", snappath
, direntp
->d_name
);
2790 if (ret
< 0 || ret
>= MAXPATHLEN
) {
2791 ERROR("pathname too long");
2794 if (!file_exists(path2
))
2796 nsnaps
= realloc(snaps
, (count
+ 1)*sizeof(*snaps
));
2798 SYSERROR("Out of memory");
2802 snaps
[count
].free
= lxcsnap_free
;
2803 snaps
[count
].name
= strdup(direntp
->d_name
);
2804 if (!snaps
[count
].name
)
2806 snaps
[count
].lxcpath
= strdup(snappath
);
2807 if (!snaps
[count
].lxcpath
) {
2808 free(snaps
[count
].name
);
2811 snaps
[count
].comment_pathname
= get_snapcomment_path(snappath
, direntp
->d_name
);
2812 snaps
[count
].timestamp
= get_timestamp(snappath
, direntp
->d_name
);
2818 WARN("failed to close directory");
2827 for (i
=0; i
<count
; i
++)
2828 lxcsnap_free(&snaps
[i
]);
2833 WARN("failed to close directory");
2838 static bool lxcapi_snapshot_restore(struct lxc_container
*c
, char *snapname
, char *newname
)
2840 char clonelxcpath
[MAXPATHLEN
];
2842 struct lxc_container
*snap
, *rest
;
2846 if (!c
|| !c
->name
|| !c
->config_path
)
2849 bdev
= bdev_init(c
->lxc_conf
->rootfs
.path
, c
->lxc_conf
->rootfs
.mount
, NULL
);
2851 ERROR("Failed to find original backing store type");
2857 if (strcmp(c
->name
, newname
) == 0) {
2858 if (!lxcapi_destroy(c
)) {
2859 ERROR("Could not destroy existing container %s", newname
);
2864 ret
= snprintf(clonelxcpath
, MAXPATHLEN
, "%ssnaps/%s", c
->config_path
, c
->name
);
2865 if (ret
< 0 || ret
>= MAXPATHLEN
) {
2869 // how should we lock this?
2871 snap
= lxc_container_new(snapname
, clonelxcpath
);
2872 if (!snap
|| !lxcapi_is_defined(snap
)) {
2873 ERROR("Could not open snapshot %s", snapname
);
2874 if (snap
) lxc_container_put(snap
);
2879 rest
= lxcapi_clone(snap
, newname
, c
->config_path
, 0, bdev
->type
, NULL
, 0, NULL
);
2881 if (rest
&& lxcapi_is_defined(rest
))
2884 lxc_container_put(rest
);
2885 lxc_container_put(snap
);
2889 static bool lxcapi_snapshot_destroy(struct lxc_container
*c
, char *snapname
)
2892 char clonelxcpath
[MAXPATHLEN
];
2893 struct lxc_container
*snap
= NULL
;
2895 if (!c
|| !c
->name
|| !c
->config_path
)
2898 ret
= snprintf(clonelxcpath
, MAXPATHLEN
, "%ssnaps/%s", c
->config_path
, c
->name
);
2899 if (ret
< 0 || ret
>= MAXPATHLEN
)
2902 snap
= lxc_container_new(snapname
, clonelxcpath
);
2903 if (!snap
|| !lxcapi_is_defined(snap
)) {
2904 ERROR("Could not find snapshot %s", snapname
);
2908 if (!lxcapi_destroy(snap
)) {
2909 ERROR("Could not destroy snapshot %s", snapname
);
2912 lxc_container_put(snap
);
2917 lxc_container_put(snap
);
2921 static bool lxcapi_may_control(struct lxc_container
*c
)
2923 return lxc_try_cmd(c
->name
, c
->config_path
) == 0;
2926 static bool add_remove_device_node(struct lxc_container
*c
, char *src_path
, char *dest_path
, bool add
)
2930 char path
[MAXPATHLEN
];
2931 char value
[MAX_BUFFER
];
2932 char *directory_path
= NULL
, *p
;
2934 /* make sure container is running */
2935 if (!c
->is_running(c
)) {
2936 ERROR("container is not running");
2940 /* use src_path if dest_path is NULL otherwise use dest_path */
2941 p
= dest_path
? dest_path
: src_path
;
2943 /* prepare the path */
2944 ret
= snprintf(path
, MAXPATHLEN
, "/proc/%d/root/%s", c
->init_pid(c
), p
);
2945 if (ret
< 0 || ret
>= MAXPATHLEN
)
2947 remove_trailing_slashes(path
);
2949 p
= add
? src_path
: path
;
2950 /* make sure we can access p */
2951 if(access(p
, F_OK
) < 0 || stat(p
, &st
) < 0)
2954 /* continue if path is character device or block device */
2955 if S_ISCHR(st
.st_mode
)
2956 ret
= snprintf(value
, MAX_BUFFER
, "c %d:%d rwm", major(st
.st_rdev
), minor(st
.st_rdev
));
2957 else if S_ISBLK(st
.st_mode
)
2958 ret
= snprintf(value
, MAX_BUFFER
, "b %d:%d rwm", major(st
.st_rdev
), minor(st
.st_rdev
));
2962 /* check snprintf return code */
2963 if (ret
< 0 || ret
>= MAX_BUFFER
)
2966 directory_path
= dirname(strdup(path
));
2967 /* remove path and directory_path (if empty) */
2968 if(access(path
, F_OK
) == 0) {
2969 if (unlink(path
) < 0) {
2970 ERROR("unlink failed");
2973 if (rmdir(directory_path
) < 0 && errno
!= ENOTEMPTY
) {
2974 ERROR("rmdir failed");
2980 /* create the missing directories */
2981 if (mkdir_p(directory_path
, 0755) < 0) {
2982 ERROR("failed to create directory");
2986 /* create the device node */
2987 if (mknod(path
, st
.st_mode
, st
.st_rdev
) < 0) {
2988 ERROR("mknod failed");
2992 /* add device node to device list */
2993 if (!c
->set_cgroup_item(c
, "devices.allow", value
)) {
2994 ERROR("set_cgroup_item failed while adding the device node");
2998 /* remove device node from device list */
2999 if (!c
->set_cgroup_item(c
, "devices.deny", value
)) {
3000 ERROR("set_cgroup_item failed while removing the device node");
3007 free(directory_path
);
3011 static bool lxcapi_add_device_node(struct lxc_container
*c
, char *src_path
, char *dest_path
)
3013 return add_remove_device_node(c
, src_path
, dest_path
, true);
3016 static bool lxcapi_remove_device_node(struct lxc_container
*c
, char *src_path
, char *dest_path
)
3018 return add_remove_device_node(c
, src_path
, dest_path
, false);
3021 static int lxcapi_attach_run_waitl(struct lxc_container
*c
, lxc_attach_options_t
*options
, const char *program
, const char *arg
, ...)
3031 argv
= lxc_va_arg_list_to_argv_const(ap
, 1);
3035 ERROR("Memory allocation error.");
3040 ret
= lxcapi_attach_run_wait(c
, options
, program
, (const char * const *)argv
);
3045 struct lxc_container
*lxc_container_new(const char *name
, const char *configpath
)
3047 struct lxc_container
*c
;
3049 c
= malloc(sizeof(*c
));
3051 fprintf(stderr
, "failed to malloc lxc_container\n");
3054 memset(c
, 0, sizeof(*c
));
3057 c
->config_path
= strdup(configpath
);
3059 c
->config_path
= strdup(default_lxc_path());
3061 if (!c
->config_path
) {
3062 fprintf(stderr
, "Out of memory");
3066 remove_trailing_slashes(c
->config_path
);
3067 c
->name
= malloc(strlen(name
)+1);
3069 fprintf(stderr
, "Error allocating lxc_container name\n");
3072 strcpy(c
->name
, name
);
3075 if (!(c
->slock
= lxc_newlock(c
->config_path
, name
))) {
3076 fprintf(stderr
, "failed to create lock\n");
3080 if (!(c
->privlock
= lxc_newlock(NULL
, NULL
))) {
3081 fprintf(stderr
, "failed to alloc privlock\n");
3085 if (!set_config_filename(c
)) {
3086 fprintf(stderr
, "Error allocating config file pathname\n");
3090 if (file_exists(c
->configfile
))
3091 lxcapi_load_config(c
, NULL
);
3093 if (ongoing_create(c
) == 2) {
3094 ERROR("Error: %s creation was not completed", c
->name
);
3096 lxc_conf_free(c
->lxc_conf
);
3100 // assign the member functions
3101 c
->is_defined
= lxcapi_is_defined
;
3102 c
->state
= lxcapi_state
;
3103 c
->is_running
= lxcapi_is_running
;
3104 c
->freeze
= lxcapi_freeze
;
3105 c
->unfreeze
= lxcapi_unfreeze
;
3106 c
->console
= lxcapi_console
;
3107 c
->console_getfd
= lxcapi_console_getfd
;
3108 c
->init_pid
= lxcapi_init_pid
;
3109 c
->load_config
= lxcapi_load_config
;
3110 c
->want_daemonize
= lxcapi_want_daemonize
;
3111 c
->want_close_all_fds
= lxcapi_want_close_all_fds
;
3112 c
->start
= lxcapi_start
;
3113 c
->startl
= lxcapi_startl
;
3114 c
->stop
= lxcapi_stop
;
3115 c
->config_file_name
= lxcapi_config_file_name
;
3116 c
->wait
= lxcapi_wait
;
3117 c
->set_config_item
= lxcapi_set_config_item
;
3118 c
->destroy
= lxcapi_destroy
;
3119 c
->save_config
= lxcapi_save_config
;
3120 c
->get_keys
= lxcapi_get_keys
;
3121 c
->create
= lxcapi_create
;
3122 c
->createl
= lxcapi_createl
;
3123 c
->shutdown
= lxcapi_shutdown
;
3124 c
->reboot
= lxcapi_reboot
;
3125 c
->clear_config_item
= lxcapi_clear_config_item
;
3126 c
->get_config_item
= lxcapi_get_config_item
;
3127 c
->get_cgroup_item
= lxcapi_get_cgroup_item
;
3128 c
->set_cgroup_item
= lxcapi_set_cgroup_item
;
3129 c
->get_config_path
= lxcapi_get_config_path
;
3130 c
->set_config_path
= lxcapi_set_config_path
;
3131 c
->clone
= lxcapi_clone
;
3132 c
->get_interfaces
= lxcapi_get_interfaces
;
3133 c
->get_ips
= lxcapi_get_ips
;
3134 c
->attach
= lxcapi_attach
;
3135 c
->attach_run_wait
= lxcapi_attach_run_wait
;
3136 c
->attach_run_waitl
= lxcapi_attach_run_waitl
;
3137 c
->snapshot
= lxcapi_snapshot
;
3138 c
->snapshot_list
= lxcapi_snapshot_list
;
3139 c
->snapshot_restore
= lxcapi_snapshot_restore
;
3140 c
->snapshot_destroy
= lxcapi_snapshot_destroy
;
3141 c
->may_control
= lxcapi_may_control
;
3142 c
->add_device_node
= lxcapi_add_device_node
;
3143 c
->remove_device_node
= lxcapi_remove_device_node
;
3145 /* we'll allow the caller to update these later */
3146 if (lxc_log_init(NULL
, "none", NULL
, "lxc_container", 0, c
->config_path
)) {
3147 fprintf(stderr
, "failed to open log\n");
3154 lxc_container_free(c
);
3158 int lxc_get_wait_states(const char **states
)
3163 for (i
=0; i
<MAX_STATE
; i
++)
3164 states
[i
] = lxc_state2str(i
);
3169 * These next two could probably be done smarter with reusing a common function
3170 * with different iterators and tests...
3172 int list_defined_containers(const char *lxcpath
, char ***names
, struct lxc_container
***cret
)
3175 int i
, cfound
= 0, nfound
= 0;
3176 struct dirent dirent
, *direntp
;
3177 struct lxc_container
*c
;
3180 lxcpath
= default_lxc_path();
3183 dir
= opendir(lxcpath
);
3187 SYSERROR("opendir on lxcpath");
3196 while (!readdir_r(dir
, &dirent
, &direntp
)) {
3199 if (!strcmp(direntp
->d_name
, "."))
3201 if (!strcmp(direntp
->d_name
, ".."))
3204 if (!config_file_exists(lxcpath
, direntp
->d_name
))
3208 if (!add_to_array(names
, direntp
->d_name
, cfound
))
3218 c
= lxc_container_new(direntp
->d_name
, lxcpath
);
3220 INFO("Container %s:%s has a config but could not be loaded",
3221 lxcpath
, direntp
->d_name
);
3223 if(!remove_from_array(names
, direntp
->d_name
, cfound
--))
3227 if (!lxcapi_is_defined(c
)) {
3228 INFO("Container %s:%s has a config but is not defined",
3229 lxcpath
, direntp
->d_name
);
3231 if(!remove_from_array(names
, direntp
->d_name
, cfound
--))
3233 lxc_container_put(c
);
3237 if (!add_to_clist(cret
, c
, nfound
, true)) {
3238 lxc_container_put(c
);
3250 if (names
&& *names
) {
3251 for (i
=0; i
<cfound
; i
++)
3255 if (cret
&& *cret
) {
3256 for (i
=0; i
<nfound
; i
++)
3257 lxc_container_put((*cret
)[i
]);
3266 int list_active_containers(const char *lxcpath
, char ***nret
,
3267 struct lxc_container
***cret
)
3269 int i
, ret
= -1, cret_cnt
= 0, ct_name_cnt
= 0;
3272 char **ct_name
= NULL
;
3274 struct lxc_container
*c
;
3277 lxcpath
= default_lxc_path();
3278 lxcpath_len
= strlen(lxcpath
);
3286 FILE *f
= fopen("/proc/net/unix", "r");
3291 while (getline(&line
, &len
, f
) != -1) {
3292 char *p
= strrchr(line
, ' '), *p2
;
3299 if (strncmp(p
, lxcpath
, lxcpath_len
) != 0)
3305 // Now p is the start of lxc_name
3307 if (!p2
|| strncmp(p2
, "/command", 8) != 0)
3311 if (array_contains(&ct_name
, p
, ct_name_cnt
))
3314 if (!add_to_array(&ct_name
, p
, ct_name_cnt
))
3315 goto free_cret_list
;
3322 c
= lxc_container_new(p
, lxcpath
);
3324 INFO("Container %s:%s is running but could not be loaded",
3326 remove_from_array(&ct_name
, p
, ct_name_cnt
--);
3331 * If this is an anonymous container, then is_defined *can*
3332 * return false. So we don't do that check. Count on the
3333 * fact that the command socket exists.
3336 if (!add_to_clist(cret
, c
, cret_cnt
, true)) {
3337 lxc_container_put(c
);
3338 goto free_cret_list
;
3343 assert(!nret
|| !cret
|| cret_cnt
== ct_name_cnt
);
3352 if (cret
&& *cret
) {
3353 for (i
= 0; i
< cret_cnt
; i
++)
3354 lxc_container_put((*cret
)[i
]);
3360 for (i
= 0; i
< ct_name_cnt
; i
++)
3375 int list_all_containers(const char *lxcpath
, char ***nret
,
3376 struct lxc_container
***cret
)
3378 int i
, ret
, active_cnt
, ct_cnt
, ct_list_cnt
;
3381 struct lxc_container
**ct_list
= NULL
;
3383 ct_cnt
= list_defined_containers(lxcpath
, &ct_name
, NULL
);
3387 active_cnt
= list_active_containers(lxcpath
, &active_name
, NULL
);
3388 if (active_cnt
< 0) {
3393 for (i
= 0; i
< active_cnt
; i
++) {
3394 if (!array_contains(&ct_name
, active_name
[i
], ct_cnt
)) {
3395 if (!add_to_array(&ct_name
, active_name
[i
], ct_cnt
)) {
3397 goto free_active_name
;
3401 free(active_name
[i
]);
3402 active_name
[i
] = NULL
;
3408 for (i
= 0, ct_list_cnt
= 0; i
< ct_cnt
&& cret
; i
++) {
3409 struct lxc_container
*c
;
3411 c
= lxc_container_new(ct_name
[i
], lxcpath
);
3413 WARN("Container %s:%s could not be loaded", lxcpath
, ct_name
[i
]);
3414 remove_from_array(&ct_name
, ct_name
[i
], ct_cnt
--);
3418 if (!add_to_clist(&ct_list
, c
, ct_list_cnt
, false)) {
3419 lxc_container_put(c
);
3438 for (i
= 0; i
< ct_list_cnt
; i
++) {
3439 lxc_container_put(ct_list
[i
]);
3445 for (i
= 0; i
< active_cnt
; i
++) {
3447 free(active_name
[i
]);
3453 for (i
= 0; i
< ct_cnt
; i
++) {