3 * Copyright © 2012 Serge Hallyn <serge.hallyn@ubuntu.com>.
4 * Copyright © 2012 Canonical Ltd.
6 * This library is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
9 * version 2.1 of the License, or (at your option) any later version.
11 * This library is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Lesser General Public License for more details.
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with this library; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
26 #include <sys/types.h>
28 #include <sys/mount.h>
34 #include <arpa/inet.h>
39 #include <lxc/lxccontainer.h>
40 #include <lxc/version.h>
55 #include "namespace.h"
61 #include <../include/ifaddrs.h>
64 #define MAX_BUFFER 4096
66 #define NOT_SUPPORTED_ERROR "the requested function %s is not currently supported with unprivileged containers"
68 lxc_log_define(lxc_container
, lxc
);
70 static bool file_exists(const 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 static 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
))
114 fd
= open(path
, O_RDWR
);
116 // give benefit of the doubt
117 SYSERROR("Error opening partial file");
121 lk
.l_whence
= SEEK_SET
;
125 if (fcntl(fd
, F_GETLK
, &lk
) == 0 && lk
.l_pid
!= -1) {
126 // create is still ongoing
130 // create completed but partial is still there.
135 static int create_partial(struct lxc_container
*c
)
137 // $lxcpath + '/' + $name + '/partial' + \0
138 int len
= strlen(c
->config_path
) + strlen(c
->name
) + 10;
139 char *path
= alloca(len
);
143 ret
= snprintf(path
, len
, "%s/%s/partial", c
->config_path
, c
->name
);
144 if (ret
< 0 || ret
>= len
) {
145 ERROR("Error writing partial pathname");
148 if ((fd
=open(path
, O_RDWR
| O_CREAT
| O_EXCL
, 0755)) < 0) {
149 SYSERROR("Erorr creating partial file");
153 lk
.l_whence
= SEEK_SET
;
156 if (fcntl(fd
, F_SETLKW
, &lk
) < 0) {
157 SYSERROR("Error locking partial file %s", path
);
165 static void remove_partial(struct lxc_container
*c
, int fd
)
167 // $lxcpath + '/' + $name + '/partial' + \0
168 int len
= strlen(c
->config_path
) + strlen(c
->name
) + 10;
169 char *path
= alloca(len
);
173 ret
= snprintf(path
, len
, "%s/%s/partial", c
->config_path
, c
->name
);
174 if (ret
< 0 || ret
>= len
) {
175 ERROR("Error writing partial pathname");
178 if (unlink(path
) < 0)
179 SYSERROR("Error unlink partial file %s", path
);
183 * 1. container_mem_lock(c) protects the struct lxc_container from multiple threads.
184 * 2. container_disk_lock(c) protects the on-disk container data - in particular the
185 * container configuration file.
186 * The container_disk_lock also takes the container_mem_lock.
187 * 3. thread_mutex protects process data (ex: fd table) from multiple threads.
188 * NOTHING mutexes two independent programs with their own struct
189 * lxc_container for the same c->name, between API calls. For instance,
190 * c->config_read(); c->start(); Between those calls, data on disk
191 * could change (which shouldn't bother the caller unless for instance
192 * the rootfs get moved). c->config_read(); update; c->config_write();
193 * Two such updaters could race. The callers should therefore check their
194 * results. Trying to prevent that would necessarily expose us to deadlocks
195 * due to hung callers. So I prefer to keep the locks only within our own
196 * functions, not across functions.
198 * If you're going to clone while holding a lxccontainer, increment
199 * c->numthreads (under privlock) before forking. When deleting,
200 * decrement numthreads under privlock, then if it hits 0 you can delete.
201 * Do not ever use a lxccontainer whose numthreads you did not bump.
204 static void lxc_container_free(struct lxc_container
*c
)
211 c
->configfile
= NULL
;
213 if (c
->error_string
) {
214 free(c
->error_string
);
215 c
->error_string
= NULL
;
218 lxc_putlock(c
->slock
);
222 lxc_putlock(c
->privlock
);
230 lxc_conf_free(c
->lxc_conf
);
233 if (c
->config_path
) {
234 free(c
->config_path
);
235 c
->config_path
= NULL
;
242 * Consider the following case:
243 freer | racing get()er
244 ==================================================================
245 lxc_container_put() | lxc_container_get()
246 \ lxclock(c->privlock) | c->numthreads < 1? (no)
247 \ c->numthreads = 0 | \ lxclock(c->privlock) -> waits
249 \ lxc_container_free() | \ lxclock() returns
250 | \ c->numthreads < 1 -> return 0
252 \ \ sem_destroy(privlock) |
254 * When the get()er checks numthreads the first time, one of the following
256 * 1. freer has set numthreads = 0. get() returns 0
257 * 2. freer is between lxclock and setting numthreads to 0. get()er will
258 * sem_wait on privlock, get lxclock after freer() drops it, then see
259 * numthreads is 0 and exit without touching lxclock again..
260 * 3. freer has not yet locked privlock. If get()er runs first, then put()er
261 * will see --numthreads = 1 and not call lxc_container_free().
264 int lxc_container_get(struct lxc_container
*c
)
269 // if someone else has already started freeing the container, don't
270 // try to take the lock, which may be invalid
271 if (c
->numthreads
< 1)
274 if (container_mem_lock(c
))
276 if (c
->numthreads
< 1) {
277 // bail without trying to unlock, bc the privlock is now probably
282 container_mem_unlock(c
);
286 int lxc_container_put(struct lxc_container
*c
)
290 if (container_mem_lock(c
))
292 if (--c
->numthreads
< 1) {
293 container_mem_unlock(c
);
294 lxc_container_free(c
);
297 container_mem_unlock(c
);
301 static bool lxcapi_is_defined(struct lxc_container
*c
)
310 if (container_mem_lock(c
))
314 statret
= stat(c
->configfile
, &statbuf
);
320 container_mem_unlock(c
);
324 static const char *lxcapi_state(struct lxc_container
*c
)
330 s
= lxc_getstate(c
->name
, c
->config_path
);
331 return lxc_state2str(s
);
334 static bool is_stopped(struct lxc_container
*c
)
337 s
= lxc_getstate(c
->name
, c
->config_path
);
338 return (s
== STOPPED
);
341 static bool lxcapi_is_running(struct lxc_container
*c
)
348 if (!s
|| strcmp(s
, "STOPPED") == 0)
353 static bool lxcapi_freeze(struct lxc_container
*c
)
359 ret
= lxc_freeze(c
->name
, c
->config_path
);
365 static bool lxcapi_unfreeze(struct lxc_container
*c
)
371 ret
= lxc_unfreeze(c
->name
, c
->config_path
);
377 static int lxcapi_console_getfd(struct lxc_container
*c
, int *ttynum
, int *masterfd
)
383 ttyfd
= lxc_console_getfd(c
, ttynum
, masterfd
);
387 static int lxcapi_console(struct lxc_container
*c
, int ttynum
, int stdinfd
,
388 int stdoutfd
, int stderrfd
, int escape
)
390 return lxc_console(c
, ttynum
, stdinfd
, stdoutfd
, stderrfd
, escape
);
393 static pid_t
lxcapi_init_pid(struct lxc_container
*c
)
398 return lxc_cmd_get_init_pid(c
->name
, c
->config_path
);
401 static bool load_config_locked(struct lxc_container
*c
, const char *fname
)
404 c
->lxc_conf
= lxc_conf_init();
405 if (c
->lxc_conf
&& !lxc_config_read(fname
, c
->lxc_conf
))
410 static bool lxcapi_load_config(struct lxc_container
*c
, const char *alt_file
)
412 bool ret
= false, need_disklock
= false;
418 fname
= c
->configfile
;
424 * If we're reading something other than the container's config,
425 * we only need to lock the in-memory container. If loading the
426 * container's config file, take the disk lock.
428 if (strcmp(fname
, c
->configfile
) == 0)
429 need_disklock
= true;
432 lret
= container_disk_lock(c
);
434 lret
= container_mem_lock(c
);
438 ret
= load_config_locked(c
, fname
);
441 container_disk_unlock(c
);
443 container_mem_unlock(c
);
447 static bool lxcapi_want_daemonize(struct lxc_container
*c
, bool state
)
449 if (!c
|| !c
->lxc_conf
)
451 if (container_mem_lock(c
)) {
452 ERROR("Error getting mem lock");
455 c
->daemonize
= state
;
456 /* daemonize implies close_all_fds so set it */
458 c
->lxc_conf
->close_all_fds
= 1;
459 container_mem_unlock(c
);
463 static bool lxcapi_want_close_all_fds(struct lxc_container
*c
, bool state
)
465 if (!c
|| !c
->lxc_conf
)
467 if (container_mem_lock(c
)) {
468 ERROR("Error getting mem lock");
471 c
->lxc_conf
->close_all_fds
= state
;
472 container_mem_unlock(c
);
476 static bool lxcapi_wait(struct lxc_container
*c
, const char *state
, int timeout
)
483 ret
= lxc_wait(c
->name
, state
, timeout
, c
->config_path
);
488 static bool wait_on_daemonized_start(struct lxc_container
*c
, int pid
)
490 /* we'll probably want to make this timeout configurable? */
491 int timeout
= 5, ret
, status
;
494 * our child is going to fork again, then exit. reap the
497 ret
= waitpid(pid
, &status
, 0);
498 if (ret
== -1 || !WIFEXITED(status
) || WEXITSTATUS(status
) != 0)
499 DEBUG("failed waiting for first dual-fork child");
500 return lxcapi_wait(c
, "RUNNING", timeout
);
503 static bool am_single_threaded(void)
505 struct dirent dirent
, *direntp
;
509 dir
= opendir("/proc/self/task");
511 INFO("failed to open /proc/self/task");
515 while (!readdir_r(dir
, &dirent
, &direntp
)) {
519 if (!strcmp(direntp
->d_name
, "."))
522 if (!strcmp(direntp
->d_name
, ".."))
532 * I can't decide if it'd be more convenient for callers if we accept '...',
533 * or a null-terminated array (i.e. execl vs execv)
535 static bool lxcapi_start(struct lxc_container
*c
, int useinit
, char * const argv
[])
538 struct lxc_conf
*conf
;
539 bool daemonize
= false;
541 char *default_args
[] = {
546 /* container exists */
549 /* container has been setup */
553 if ((ret
= ongoing_create(c
)) < 0) {
554 ERROR("Error checking for incomplete creation");
558 ERROR("Error: %s creation was not completed", c
->name
);
561 } else if (ret
== 1) {
562 ERROR("Error: creation of %s is ongoing", c
->name
);
566 /* is this app meant to be run through lxcinit, as in lxc-execute? */
567 if (useinit
&& !argv
)
570 if (container_mem_lock(c
))
573 daemonize
= c
->daemonize
;
574 container_mem_unlock(c
);
577 ret
= lxc_execute(c
->name
, argv
, 1, conf
, c
->config_path
);
578 return ret
== 0 ? true : false;
585 * say, I'm not sure - what locks do we want here? Any?
586 * Is liblxc's locking enough here to protect the on disk
587 * container? We don't want to exclude things like lxc_info
588 * while container is running...
591 lxc_monitord_spawn(c
->config_path
);
598 /* Set to NULL because we don't want father unlink
599 * the PID file, child will do the free and unlink.
602 return wait_on_daemonized_start(c
, pid
);
605 /* second fork to be reparented by init */
608 SYSERROR("Error doing dual-fork");
613 /* like daemon(), chdir to / and redirect 0,1,2 to /dev/null */
615 SYSERROR("Error chdir()ing to /.");
621 open("/dev/zero", O_RDONLY
);
622 open("/dev/null", O_RDWR
);
623 open("/dev/null", O_RDWR
);
626 if (!am_single_threaded()) {
627 ERROR("Cannot start non-daemonized container when threaded");
632 /* We need to write PID file after daeminize, so we always
633 * write the right PID.
636 pid_fp
= fopen(c
->pidfile
, "w");
637 if (pid_fp
== NULL
) {
638 SYSERROR("Failed to create pidfile '%s' for '%s'",
639 c
->pidfile
, c
->name
);
643 if (fprintf(pid_fp
, "%d\n", getpid()) < 0) {
644 SYSERROR("Failed to write '%s'", c
->pidfile
);
656 ret
= lxc_start(c
->name
, argv
, conf
, c
->config_path
);
659 INFO("container requested reboot");
671 exit (ret
== 0 ? true : false);
673 return (ret
== 0 ? true : false);
677 * note there MUST be an ending NULL
679 static bool lxcapi_startl(struct lxc_container
*c
, int useinit
, ...)
682 char **inargs
= NULL
;
685 /* container exists */
689 va_start(ap
, useinit
);
690 inargs
= lxc_va_arg_list_to_argv(ap
, 0, 1);
694 ERROR("Memory allocation error.");
698 /* pass NULL if no arguments were supplied */
699 bret
= lxcapi_start(c
, useinit
, *inargs
? inargs
: NULL
);
704 for (arg
= inargs
; *arg
; arg
++)
712 static bool lxcapi_stop(struct lxc_container
*c
)
719 ret
= lxc_cmd_stop(c
->name
, c
->config_path
);
725 * create the standard expected container dir
727 static bool create_container_dir(struct lxc_container
*c
)
732 len
= strlen(c
->config_path
) + strlen(c
->name
) + 2;
736 ret
= snprintf(s
, len
, "%s/%s", c
->config_path
, c
->name
);
737 if (ret
< 0 || ret
>= len
) {
741 ret
= mkdir(s
, 0755);
746 SYSERROR("failed to create container path for %s", c
->name
);
752 static const char *lxcapi_get_config_path(struct lxc_container
*c
);
753 static bool lxcapi_set_config_item(struct lxc_container
*c
, const char *key
, const char *v
);
756 * do_bdev_create: thin wrapper around bdev_create(). Like bdev_create(),
757 * it returns a mounted bdev on success, NULL on error.
759 static struct bdev
*do_bdev_create(struct lxc_container
*c
, const char *type
,
760 struct bdev_specs
*specs
)
767 /* rootfs.path or lxcpath/lxcname/rootfs */
768 if (c
->lxc_conf
->rootfs
.path
&& access(c
->lxc_conf
->rootfs
.path
, F_OK
) == 0) {
769 const char *rpath
= c
->lxc_conf
->rootfs
.path
;
770 len
= strlen(rpath
) + 1;
772 ret
= snprintf(dest
, len
, "%s", rpath
);
774 const char *lxcpath
= lxcapi_get_config_path(c
);
775 len
= strlen(c
->name
) + strlen(lxcpath
) + 9;
777 ret
= snprintf(dest
, len
, "%s/%s/rootfs", lxcpath
, c
->name
);
779 if (ret
< 0 || ret
>= len
)
782 bdev
= bdev_create(dest
, type
, c
->name
, specs
);
784 ERROR("Failed to create backing store type %s", type
);
788 lxcapi_set_config_item(c
, "lxc.rootfs", bdev
->src
);
790 /* if we are not root, chown the rootfs dir to root in the
793 if (geteuid() != 0) {
794 if (chown_mapped_root(bdev
->dest
, c
->lxc_conf
) < 0) {
795 ERROR("Error chowning %s to container root", bdev
->dest
);
805 * Given the '-t' template option to lxc-create, figure out what to
806 * do. If the template is a full executable path, use that. If it
807 * is something like 'sshd', then return $templatepath/lxc-sshd.
808 * On success return the template, on error return NULL.
810 static char *get_template_path(const char *t
)
815 if (t
[0] == '/' && access(t
, X_OK
) == 0) {
820 len
= strlen(LXCTEMPLATEDIR
) + strlen(t
) + strlen("/lxc-") + 1;
824 ret
= snprintf(tpath
, len
, "%s/lxc-%s", LXCTEMPLATEDIR
, t
);
825 if (ret
< 0 || ret
>= len
) {
829 if (access(tpath
, X_OK
) < 0) {
830 SYSERROR("bad template: %s", t
);
838 static char *lxcbasename(char *path
)
840 char *p
= path
+ strlen(path
) - 1;
841 while (*p
!= '/' && p
> path
)
846 static bool create_run_template(struct lxc_container
*c
, char *tpath
, bool quiet
,
856 SYSERROR("failed to fork task for container creation template");
860 if (pid
== 0) { // child
861 char *patharg
, *namearg
, *rootfsarg
, *src
;
862 struct bdev
*bdev
= NULL
;
864 int ret
, len
, nargs
= 0;
866 struct lxc_conf
*conf
= c
->lxc_conf
;
872 open("/dev/zero", O_RDONLY
);
873 open("/dev/null", O_RDWR
);
874 open("/dev/null", O_RDWR
);
877 src
= c
->lxc_conf
->rootfs
.path
;
879 * for an overlayfs create, what the user wants is the template to fill
880 * in what will become the readonly lower layer. So don't mount for
883 if (strncmp(src
, "overlayfs:", 10) == 0) {
884 src
= overlayfs_getlower(src
+10);
886 bdev
= bdev_init(src
, c
->lxc_conf
->rootfs
.mount
, NULL
);
888 ERROR("Error opening rootfs");
892 if (geteuid() == 0) {
893 if (unshare(CLONE_NEWNS
) < 0) {
894 ERROR("error unsharing mounts");
897 if (detect_shared_rootfs()) {
898 if (mount("", "", NULL
, MS_SLAVE
|MS_REC
, 0)) {
899 SYSERROR("Failed to make / rslave to run template");
900 ERROR("Continuing...");
904 if (strcmp(bdev
->type
, "dir") != 0) {
905 if (geteuid() != 0) {
906 ERROR("non-root users can only create directory-backed containers");
909 if (bdev
->ops
->mount(bdev
) < 0) {
910 ERROR("Error mounting rootfs");
913 } else { // TODO come up with a better way here!
916 bdev
->dest
= strdup(bdev
->src
);
920 * create our new array, pre-pend the template name and
924 for (nargs
= 0; argv
[nargs
]; nargs
++) ;
925 nargs
+= 4; // template, path, rootfs and name args
927 newargv
= malloc(nargs
* sizeof(*newargv
));
930 newargv
[0] = lxcbasename(tpath
);
932 len
= strlen(c
->config_path
) + strlen(c
->name
) + strlen("--path=") + 2;
933 patharg
= malloc(len
);
936 ret
= snprintf(patharg
, len
, "--path=%s/%s", c
->config_path
, c
->name
);
937 if (ret
< 0 || ret
>= len
)
939 newargv
[1] = patharg
;
940 len
= strlen("--name=") + strlen(c
->name
) + 1;
941 namearg
= malloc(len
);
944 ret
= snprintf(namearg
, len
, "--name=%s", c
->name
);
945 if (ret
< 0 || ret
>= len
)
947 newargv
[2] = namearg
;
949 len
= strlen("--rootfs=") + 1 + strlen(bdev
->dest
);
950 rootfsarg
= malloc(len
);
953 ret
= snprintf(rootfsarg
, len
, "--rootfs=%s", bdev
->dest
);
954 if (ret
< 0 || ret
>= len
)
956 newargv
[3] = rootfsarg
;
958 /* add passed-in args */
960 for (i
= 4; i
< nargs
; i
++)
961 newargv
[i
] = argv
[i
-4];
963 /* add trailing NULL */
965 newargv
= realloc(newargv
, nargs
* sizeof(*newargv
));
968 newargv
[nargs
- 1] = NULL
;
971 * If we're running the template in a mapped userns, then
972 * we prepend the template command with:
973 * lxc-usernsexec <-m map1> ... <-m mapn> --
974 * and we append "--mapped-uid x", where x is the mapped uid
977 if (geteuid() != 0 && !lxc_list_empty(&conf
->id_map
)) {
981 char **n2
= malloc(n2args
* sizeof(*n2
));
986 SYSERROR("out of memory");
990 tpath
= "lxc-usernsexec";
991 n2
[0] = "lxc-usernsexec";
992 lxc_list_for_each(it
, &conf
->id_map
) {
995 n2
= realloc(n2
, n2args
* sizeof(char *));
999 n2
[n2args
-1] = malloc(200);
1002 ret
= snprintf(n2
[n2args
-1], 200, "%c:%lu:%lu:%lu",
1003 map
->idtype
== ID_TYPE_UID
? 'u' : 'g',
1004 map
->nsid
, map
->hostid
, map
->range
);
1005 if (ret
< 0 || ret
>= 200)
1008 int hostid_mapped
= mapped_hostid(geteuid(), conf
, ID_TYPE_UID
);
1009 int extraargs
= hostid_mapped
>= 0 ? 1 : 3;
1010 n2
= realloc(n2
, (nargs
+ n2args
+ extraargs
) * sizeof(char *));
1013 if (hostid_mapped
< 0) {
1014 hostid_mapped
= find_unmapped_nsuid(conf
, ID_TYPE_UID
);
1015 n2
[n2args
++] = "-m";
1016 if (hostid_mapped
< 0) {
1017 ERROR("Could not find free uid to map");
1020 n2
[n2args
++] = malloc(200);
1021 if (!n2
[n2args
-1]) {
1022 SYSERROR("out of memory");
1025 ret
= snprintf(n2
[n2args
-1], 200, "u:%d:%d:1",
1026 hostid_mapped
, geteuid());
1027 if (ret
< 0 || ret
>= 200) {
1028 ERROR("string too long");
1032 int hostgid_mapped
= mapped_hostid(getegid(), conf
, ID_TYPE_GID
);
1033 extraargs
= hostgid_mapped
>= 0 ? 1 : 3;
1034 n2
= realloc(n2
, (nargs
+ n2args
+ extraargs
) * sizeof(char *));
1037 if (hostgid_mapped
< 0) {
1038 hostgid_mapped
= find_unmapped_nsuid(conf
, ID_TYPE_GID
);
1039 n2
[n2args
++] = "-m";
1040 if (hostgid_mapped
< 0) {
1041 ERROR("Could not find free uid to map");
1044 n2
[n2args
++] = malloc(200);
1045 if (!n2
[n2args
-1]) {
1046 SYSERROR("out of memory");
1049 ret
= snprintf(n2
[n2args
-1], 200, "g:%d:%d:1",
1050 hostgid_mapped
, getegid());
1051 if (ret
< 0 || ret
>= 200) {
1052 ERROR("string too long");
1056 n2
[n2args
++] = "--";
1057 for (i
= 0; i
< nargs
; i
++)
1058 n2
[i
+ n2args
] = newargv
[i
];
1060 // Finally add "--mapped-uid $uid" to tell template what to chown
1063 n2
= realloc(n2
, n2args
* sizeof(char *));
1065 SYSERROR("out of memory");
1068 // note n2[n2args-1] is NULL
1069 n2
[n2args
-5] = "--mapped-uid";
1070 snprintf(txtuid
, 20, "%d", hostid_mapped
);
1071 n2
[n2args
-4] = txtuid
;
1072 n2
[n2args
-3] = "--mapped-gid";
1073 snprintf(txtgid
, 20, "%d", hostgid_mapped
);
1074 n2
[n2args
-2] = txtgid
;
1075 n2
[n2args
-1] = NULL
;
1080 execvp(tpath
, newargv
);
1081 SYSERROR("failed to execute template %s", tpath
);
1085 if (wait_for_pid(pid
) != 0) {
1086 ERROR("container creation template for %s failed", c
->name
);
1093 static bool prepend_lxc_header(char *path
, const char *t
, char *const argv
[])
1101 unsigned char md_value
[SHA_DIGEST_LENGTH
];
1105 f
= fopen(path
, "r");
1109 if (fseek(f
, 0, SEEK_END
) < 0)
1111 if ((flen
= ftell(f
)) < 0)
1113 if (fseek(f
, 0, SEEK_SET
) < 0)
1115 if ((contents
= malloc(flen
+ 1)) == NULL
)
1117 if (fread(contents
, 1, flen
, f
) != flen
)
1118 goto out_free_contents
;
1120 contents
[flen
] = '\0';
1124 goto out_free_contents
;
1127 tpath
= get_template_path(t
);
1129 ERROR("bad template: %s", t
);
1130 goto out_free_contents
;
1133 ret
= sha1sum_file(tpath
, md_value
);
1135 ERROR("Error getting sha1sum of %s", tpath
);
1137 goto out_free_contents
;
1142 f
= fopen(path
, "w");
1144 SYSERROR("reopening config for writing");
1148 fprintf(f
, "# Template used to create this container: %s\n", t
);
1150 fprintf(f
, "# Parameters passed to the template:");
1152 fprintf(f
, " %s", *argv
);
1158 fprintf(f
, "# Template script checksum (SHA-1): ");
1159 for (i
=0; i
<SHA_DIGEST_LENGTH
; i
++)
1160 fprintf(f
, "%02x", md_value
[i
]);
1163 fprintf(f
, "# For additional config options, please look at lxc.conf(5)\n");
1164 if (fwrite(contents
, 1, flen
, f
) != flen
) {
1165 SYSERROR("Writing original contents");
1181 SYSERROR("Error prepending header");
1187 static void lxcapi_clear_config(struct lxc_container
*c
)
1189 if (c
&& c
->lxc_conf
) {
1190 lxc_conf_free(c
->lxc_conf
);
1195 static bool lxcapi_destroy(struct lxc_container
*c
);
1198 * create a container with the given parameters.
1199 * @c: container to be created. It has the lxcpath, name, and a starting
1200 * configuration already set
1201 * @t: the template to execute to instantiate the root filesystem and
1202 * adjust the configuration.
1203 * @bdevtype: backing store type to use. If NULL, dir will be used.
1204 * @specs: additional parameters for the backing store, i.e. LVM vg to
1207 * @argv: the arguments to pass to the template, terminated by NULL. If no
1208 * arguments, you can just pass NULL.
1210 static bool lxcapi_create(struct lxc_container
*c
, const char *t
,
1211 const char *bdevtype
, struct bdev_specs
*specs
, int flags
,
1223 tpath
= get_template_path(t
);
1225 ERROR("bad template: %s", t
);
1231 * If a template is passed in, and the rootfs already is defined in
1232 * the container config and exists, then * caller is trying to create
1233 * an existing container. Return an error, but do NOT delete the
1236 if (lxcapi_is_defined(c
) && c
->lxc_conf
&& c
->lxc_conf
->rootfs
.path
&&
1237 access(c
->lxc_conf
->rootfs
.path
, F_OK
) == 0 && tpath
) {
1238 ERROR("Container %s:%s already exists", c
->config_path
, c
->name
);
1243 if (!c
->load_config(c
, lxc_global_config_value("lxc.default_config"))) {
1244 ERROR("Error loading default configuration file %s", lxc_global_config_value("lxc.default_config"));
1249 if (!create_container_dir(c
))
1253 * either template or rootfs.path should be set.
1254 * if both template and rootfs.path are set, template is setup as rootfs.path.
1255 * container is already created if we have a config and rootfs.path is accessible
1257 if (!c
->lxc_conf
->rootfs
.path
&& !tpath
)
1258 /* no template passed in and rootfs does not exist: error */
1260 if (c
->lxc_conf
->rootfs
.path
&& access(c
->lxc_conf
->rootfs
.path
, F_OK
) != 0)
1261 /* rootfs passed into configuration, but does not exist: error */
1263 if (lxcapi_is_defined(c
) && c
->lxc_conf
->rootfs
.path
&& !tpath
) {
1264 /* Rootfs already existed, user just wanted to save the
1265 * loaded configuration */
1270 /* Mark that this container is being created */
1271 if ((partial_fd
= create_partial(c
)) < 0)
1274 /* no need to get disk lock bc we have the partial locked */
1277 * Create the backing store
1278 * Note we can't do this in the same task as we use to execute the
1279 * template because of the way zfs works.
1280 * After you 'zfs create', zfs mounts the fs only in the initial
1285 SYSERROR("failed to fork task for container creation template");
1289 if (pid
== 0) { // child
1290 struct bdev
*bdev
= NULL
;
1292 if (!(bdev
= do_bdev_create(c
, bdevtype
, specs
))) {
1293 ERROR("Error creating backing store type %s for %s",
1294 bdevtype
? bdevtype
: "(none)", c
->name
);
1298 /* save config file again to store the new rootfs location */
1299 if (!c
->save_config(c
, NULL
)) {
1300 ERROR("failed to save starting configuration for %s", c
->name
);
1301 // parent task won't see bdev in config so we delete it
1302 bdev
->ops
->umount(bdev
);
1303 bdev
->ops
->destroy(bdev
);
1308 if (wait_for_pid(pid
) != 0)
1311 /* reload config to get the rootfs */
1312 lxc_conf_free(c
->lxc_conf
);
1314 if (!load_config_locked(c
, c
->configfile
))
1317 if (!create_run_template(c
, tpath
, !!(flags
& LXC_CREATE_QUIET
), argv
))
1320 // now clear out the lxc_conf we have, reload from the created
1322 lxcapi_clear_config(c
);
1325 if (!prepend_lxc_header(c
->configfile
, tpath
, argv
)) {
1326 ERROR("Error prepending header to configuration file");
1330 ret
= load_config_locked(c
, c
->configfile
);
1333 if (partial_fd
>= 0)
1334 remove_partial(c
, partial_fd
);
1344 static bool lxcapi_reboot(struct lxc_container
*c
)
1350 if (!c
->is_running(c
))
1352 pid
= c
->init_pid(c
);
1355 if (kill(pid
, SIGINT
) < 0)
1361 static bool lxcapi_shutdown(struct lxc_container
*c
, int timeout
)
1365 int haltsignal
= SIGPWR
;
1370 if (!c
->is_running(c
))
1372 pid
= c
->init_pid(c
);
1375 if (c
->lxc_conf
&& c
->lxc_conf
->haltsignal
)
1376 haltsignal
= c
->lxc_conf
->haltsignal
;
1377 kill(pid
, haltsignal
);
1378 retv
= c
->wait(c
, "STOPPED", timeout
);
1382 static bool lxcapi_createl(struct lxc_container
*c
, const char *t
,
1383 const char *bdevtype
, struct bdev_specs
*specs
, int flags
, ...)
1393 * since we're going to wait for create to finish, I don't think we
1394 * need to get a copy of the arguments.
1396 va_start(ap
, flags
);
1397 args
= lxc_va_arg_list_to_argv(ap
, 0, 0);
1400 ERROR("Memory allocation error.");
1404 bret
= c
->create(c
, t
, bdevtype
, specs
, flags
, args
);
1411 static bool lxcapi_clear_config_item(struct lxc_container
*c
, const char *key
)
1415 if (!c
|| !c
->lxc_conf
)
1417 if (container_mem_lock(c
))
1419 ret
= lxc_clear_config_item(c
->lxc_conf
, key
);
1420 container_mem_unlock(c
);
1424 static inline bool enter_to_ns(struct lxc_container
*c
) {
1425 int netns
, userns
, ret
= 0, init_pid
= 0;;
1426 char new_netns_path
[MAXPATHLEN
];
1427 char new_userns_path
[MAXPATHLEN
];
1429 if (!c
->is_running(c
))
1432 init_pid
= c
->init_pid(c
);
1434 /* Switch to new userns */
1435 if (geteuid() && access("/proc/self/ns/user", F_OK
) == 0) {
1436 ret
= snprintf(new_userns_path
, MAXPATHLEN
, "/proc/%d/ns/user", init_pid
);
1437 if (ret
< 0 || ret
>= MAXPATHLEN
)
1440 userns
= open(new_userns_path
, O_RDONLY
);
1442 SYSERROR("failed to open %s", new_userns_path
);
1446 if (setns(userns
, CLONE_NEWUSER
)) {
1447 SYSERROR("failed to setns for CLONE_NEWUSER");
1454 /* Switch to new netns */
1455 ret
= snprintf(new_netns_path
, MAXPATHLEN
, "/proc/%d/ns/net", init_pid
);
1456 if (ret
< 0 || ret
>= MAXPATHLEN
)
1459 netns
= open(new_netns_path
, O_RDONLY
);
1461 SYSERROR("failed to open %s", new_netns_path
);
1465 if (setns(netns
, CLONE_NEWNET
)) {
1466 SYSERROR("failed to setns for CLONE_NEWNET");
1476 // used by qsort and bsearch functions for comparing names
1477 static inline int string_cmp(char **first
, char **second
)
1479 return strcmp(*first
, *second
);
1482 // used by qsort and bsearch functions for comparing container names
1483 static inline int container_cmp(struct lxc_container
**first
, struct lxc_container
**second
)
1485 return strcmp((*first
)->name
, (*second
)->name
);
1488 static bool add_to_array(char ***names
, char *cname
, int pos
)
1490 char **newnames
= realloc(*names
, (pos
+1) * sizeof(char *));
1492 ERROR("Out of memory");
1497 newnames
[pos
] = strdup(cname
);
1501 // sort the arrray as we will use binary search on it
1502 qsort(newnames
, pos
+ 1, sizeof(char *), (int (*)(const void *,const void *))string_cmp
);
1507 static bool add_to_clist(struct lxc_container
***list
, struct lxc_container
*c
, int pos
, bool sort
)
1509 struct lxc_container
**newlist
= realloc(*list
, (pos
+1) * sizeof(struct lxc_container
*));
1511 ERROR("Out of memory");
1518 // sort the arrray as we will use binary search on it
1520 qsort(newlist
, pos
+ 1, sizeof(struct lxc_container
*), (int (*)(const void *,const void *))container_cmp
);
1525 static char** get_from_array(char ***names
, char *cname
, int size
)
1527 return (char **)bsearch(&cname
, *names
, size
, sizeof(char *), (int (*)(const void *, const void *))string_cmp
);
1531 static bool array_contains(char ***names
, char *cname
, int size
) {
1532 if(get_from_array(names
, cname
, size
) != NULL
)
1537 static bool remove_from_array(char ***names
, char *cname
, int size
)
1539 char **result
= get_from_array(names
, cname
, size
);
1540 if (result
!= NULL
) {
1547 static char** lxcapi_get_interfaces(struct lxc_container
*c
)
1550 int i
, count
= 0, pipefd
[2];
1551 char **interfaces
= NULL
;
1552 char interface
[IFNAMSIZ
];
1554 if(pipe(pipefd
) < 0) {
1555 SYSERROR("pipe failed");
1561 SYSERROR("failed to fork task to get interfaces information");
1567 if (pid
== 0) { // child
1568 int ret
= 1, nbytes
;
1569 struct ifaddrs
*interfaceArray
= NULL
, *tempIfAddr
= NULL
;
1571 /* close the read-end of the pipe */
1574 if (!enter_to_ns(c
)) {
1575 SYSERROR("failed to enter namespace");
1579 /* Grab the list of interfaces */
1580 if (getifaddrs(&interfaceArray
)) {
1581 SYSERROR("failed to get interfaces list");
1585 /* Iterate through the interfaces */
1586 for (tempIfAddr
= interfaceArray
; tempIfAddr
!= NULL
; tempIfAddr
= tempIfAddr
->ifa_next
) {
1587 nbytes
= write(pipefd
[1], tempIfAddr
->ifa_name
, IFNAMSIZ
);
1589 ERROR("write failed");
1598 freeifaddrs(interfaceArray
);
1600 /* close the write-end of the pipe, thus sending EOF to the reader */
1605 /* close the write-end of the pipe */
1608 while (read(pipefd
[0], &interface
, IFNAMSIZ
) == IFNAMSIZ
) {
1609 if (array_contains(&interfaces
, interface
, count
))
1612 if(!add_to_array(&interfaces
, interface
, count
))
1613 ERROR("PARENT: add_to_array failed");
1617 if (wait_for_pid(pid
) != 0) {
1618 for(i
=0;i
<count
;i
++)
1619 free(interfaces
[i
]);
1624 /* close the read-end of the pipe */
1627 /* Append NULL to the array */
1629 interfaces
= (char **)lxc_append_null_to_array((void **)interfaces
, count
);
1634 static char** lxcapi_get_ips(struct lxc_container
*c
, const char* interface
, const char* family
, int scope
)
1637 int i
, count
= 0, pipefd
[2];
1638 char **addresses
= NULL
;
1639 char address
[INET6_ADDRSTRLEN
];
1641 if(pipe(pipefd
) < 0) {
1642 SYSERROR("pipe failed");
1648 SYSERROR("failed to fork task to get container ips");
1654 if (pid
== 0) { // child
1655 int ret
= 1, nbytes
;
1656 struct ifaddrs
*interfaceArray
= NULL
, *tempIfAddr
= NULL
;
1657 char addressOutputBuffer
[INET6_ADDRSTRLEN
];
1658 void *tempAddrPtr
= NULL
;
1659 char *address
= NULL
;
1661 /* close the read-end of the pipe */
1664 if (!enter_to_ns(c
)) {
1665 SYSERROR("failed to enter namespace");
1669 /* Grab the list of interfaces */
1670 if (getifaddrs(&interfaceArray
)) {
1671 SYSERROR("failed to get interfaces list");
1675 /* Iterate through the interfaces */
1676 for (tempIfAddr
= interfaceArray
; tempIfAddr
!= NULL
; tempIfAddr
= tempIfAddr
->ifa_next
) {
1677 if (tempIfAddr
->ifa_addr
== NULL
)
1680 if(tempIfAddr
->ifa_addr
->sa_family
== AF_INET
) {
1681 if (family
&& strcmp(family
, "inet"))
1683 tempAddrPtr
= &((struct sockaddr_in
*)tempIfAddr
->ifa_addr
)->sin_addr
;
1686 if (family
&& strcmp(family
, "inet6"))
1689 if (((struct sockaddr_in6
*)tempIfAddr
->ifa_addr
)->sin6_scope_id
!= scope
)
1692 tempAddrPtr
= &((struct sockaddr_in6
*)tempIfAddr
->ifa_addr
)->sin6_addr
;
1695 if (interface
&& strcmp(interface
, tempIfAddr
->ifa_name
))
1697 else if (!interface
&& strcmp("lo", tempIfAddr
->ifa_name
) == 0)
1700 address
= (char *)inet_ntop(tempIfAddr
->ifa_addr
->sa_family
,
1702 addressOutputBuffer
,
1703 sizeof(addressOutputBuffer
));
1707 nbytes
= write(pipefd
[1], address
, INET6_ADDRSTRLEN
);
1709 ERROR("write failed");
1718 freeifaddrs(interfaceArray
);
1720 /* close the write-end of the pipe, thus sending EOF to the reader */
1725 /* close the write-end of the pipe */
1728 while (read(pipefd
[0], &address
, INET6_ADDRSTRLEN
) == INET6_ADDRSTRLEN
) {
1729 if(!add_to_array(&addresses
, address
, count
))
1730 ERROR("PARENT: add_to_array failed");
1734 if (wait_for_pid(pid
) != 0) {
1735 for(i
=0;i
<count
;i
++)
1741 /* close the read-end of the pipe */
1744 /* Append NULL to the array */
1746 addresses
= (char **)lxc_append_null_to_array((void **)addresses
, count
);
1751 static int lxcapi_get_config_item(struct lxc_container
*c
, const char *key
, char *retv
, int inlen
)
1755 if (!c
|| !c
->lxc_conf
)
1757 if (container_mem_lock(c
))
1759 ret
= lxc_get_config_item(c
->lxc_conf
, key
, retv
, inlen
);
1760 container_mem_unlock(c
);
1764 static char* lxcapi_get_running_config_item(struct lxc_container
*c
, const char *key
)
1768 if (!c
|| !c
->lxc_conf
)
1770 if (container_mem_lock(c
))
1772 ret
= lxc_cmd_get_config_item(c
->name
, key
, c
->get_config_path(c
));
1773 container_mem_unlock(c
);
1777 static int lxcapi_get_keys(struct lxc_container
*c
, const char *key
, char *retv
, int inlen
)
1780 return lxc_listconfigs(retv
, inlen
);
1782 * Support 'lxc.network.<idx>', i.e. 'lxc.network.0'
1783 * This is an intelligent result to show which keys are valid given
1784 * the type of nic it is
1786 if (!c
|| !c
->lxc_conf
)
1788 if (container_mem_lock(c
))
1791 if (strncmp(key
, "lxc.network.", 12) == 0)
1792 ret
= lxc_list_nicconfigs(c
->lxc_conf
, key
, retv
, inlen
);
1793 container_mem_unlock(c
);
1797 static bool lxcapi_save_config(struct lxc_container
*c
, const char *alt_file
)
1800 bool ret
= false, need_disklock
= false;
1804 alt_file
= c
->configfile
;
1806 return false; // should we write to stdout if no file is specified?
1808 // If we haven't yet loaded a config, load the stock config
1810 if (!c
->load_config(c
, lxc_global_config_value("lxc.default_config"))) {
1811 ERROR("Error loading default configuration file %s while saving %s", lxc_global_config_value("lxc.default_config"), c
->name
);
1816 if (!create_container_dir(c
))
1820 * If we're writing to the container's config file, take the
1821 * disk lock. Otherwise just take the memlock to protect the
1822 * struct lxc_container while we're traversing it.
1824 if (strcmp(c
->configfile
, alt_file
) == 0)
1825 need_disklock
= true;
1828 lret
= container_disk_lock(c
);
1830 lret
= container_mem_lock(c
);
1835 fout
= fopen(alt_file
, "w");
1838 write_config(fout
, c
->lxc_conf
);
1844 container_disk_unlock(c
);
1846 container_mem_unlock(c
);
1850 static bool mod_rdep(struct lxc_container
*c
, bool inc
)
1852 char path
[MAXPATHLEN
];
1857 if (container_disk_lock(c
))
1859 ret
= snprintf(path
, MAXPATHLEN
, "%s/%s/lxc_snapshots", c
->config_path
,
1861 if (ret
< 0 || ret
> MAXPATHLEN
)
1863 f
= fopen(path
, "r");
1865 ret
= fscanf(f
, "%d", &v
);
1868 ERROR("Corrupted file %s", path
);
1873 f
= fopen(path
, "w");
1876 if (fprintf(f
, "%d\n", v
) < 0) {
1877 ERROR("Error writing new snapshots value");
1883 SYSERROR("Error writing to or closing snapshots file");
1890 container_disk_unlock(c
);
1894 static void strip_newline(char *p
)
1896 size_t len
= strlen(p
);
1899 if (p
[len
-1] == '\n')
1903 static void mod_all_rdeps(struct lxc_container
*c
, bool inc
)
1905 struct lxc_container
*p
;
1906 char *lxcpath
= NULL
, *lxcname
= NULL
, path
[MAXPATHLEN
];
1907 size_t pathlen
= 0, namelen
= 0;
1911 ret
= snprintf(path
, MAXPATHLEN
, "%s/%s/lxc_rdepends",
1912 c
->config_path
, c
->name
);
1913 if (ret
< 0 || ret
>= MAXPATHLEN
) {
1914 ERROR("Path name too long");
1917 f
= fopen(path
, "r");
1920 while (getline(&lxcpath
, &pathlen
, f
) != -1) {
1921 if (getline(&lxcname
, &namelen
, f
) == -1) {
1922 ERROR("badly formatted file %s", path
);
1925 strip_newline(lxcpath
);
1926 strip_newline(lxcname
);
1927 if ((p
= lxc_container_new(lxcname
, lxcpath
)) == NULL
) {
1928 ERROR("Unable to find dependent container %s:%s",
1932 if (!mod_rdep(p
, inc
))
1933 ERROR("Failed to increase numsnapshots for %s:%s",
1935 lxc_container_put(p
);
1938 if (lxcpath
) free(lxcpath
);
1939 if (lxcname
) free(lxcname
);
1943 static bool has_snapshots(struct lxc_container
*c
)
1945 char path
[MAXPATHLEN
];
1950 ret
= snprintf(path
, MAXPATHLEN
, "%s/%s/lxc_snapshots", c
->config_path
,
1952 if (ret
< 0 || ret
> MAXPATHLEN
)
1954 f
= fopen(path
, "r");
1957 ret
= fscanf(f
, "%d", &v
);
1967 static int lxc_rmdir_onedev_wrapper(void *data
)
1969 char *arg
= (char *) data
;
1970 return lxc_rmdir_onedev(arg
);
1973 // do we want the api to support --force, or leave that to the caller?
1974 static bool lxcapi_destroy(struct lxc_container
*c
)
1976 struct bdev
*r
= NULL
;
1980 if (!c
|| !lxcapi_is_defined(c
))
1983 if (container_disk_lock(c
))
1986 if (!is_stopped(c
)) {
1987 // we should queue some sort of error - in c->error_string?
1988 ERROR("container %s is not stopped", c
->name
);
1992 if (c
->lxc_conf
&& has_snapshots(c
)) {
1993 ERROR("container %s has dependent snapshots", c
->name
);
1997 if (!am_unpriv() && c
->lxc_conf
&& c
->lxc_conf
->rootfs
.path
&& c
->lxc_conf
->rootfs
.mount
) {
1998 r
= bdev_init(c
->lxc_conf
->rootfs
.path
, c
->lxc_conf
->rootfs
.mount
, NULL
);
2000 if (r
->ops
->destroy(r
) < 0) {
2002 ERROR("Error destroying rootfs for %s", c
->name
);
2009 mod_all_rdeps(c
, false);
2011 const char *p1
= lxcapi_get_config_path(c
);
2012 char *path
= alloca(strlen(p1
) + strlen(c
->name
) + 2);
2013 sprintf(path
, "%s/%s", p1
, c
->name
);
2015 ret
= userns_exec_1(c
->lxc_conf
, lxc_rmdir_onedev_wrapper
, path
);
2017 ret
= lxc_rmdir_onedev(path
);
2019 ERROR("Error destroying container directory for %s", c
->name
);
2025 container_disk_unlock(c
);
2029 static bool set_config_item_locked(struct lxc_container
*c
, const char *key
, const char *v
)
2031 struct lxc_config_t
*config
;
2034 c
->lxc_conf
= lxc_conf_init();
2037 config
= lxc_getconfig(key
);
2040 return (0 == config
->cb(key
, v
, c
->lxc_conf
));
2043 static bool lxcapi_set_config_item(struct lxc_container
*c
, const char *key
, const char *v
)
2050 if (container_mem_lock(c
))
2053 b
= set_config_item_locked(c
, key
, v
);
2055 container_mem_unlock(c
);
2059 static char *lxcapi_config_file_name(struct lxc_container
*c
)
2061 if (!c
|| !c
->configfile
)
2063 return strdup(c
->configfile
);
2066 static const char *lxcapi_get_config_path(struct lxc_container
*c
)
2068 if (!c
|| !c
->config_path
)
2070 return (const char *)(c
->config_path
);
2075 * Just recalculate the c->configfile based on the
2076 * c->config_path, which must be set.
2077 * The lxc_container must be locked or not yet public.
2079 static bool set_config_filename(struct lxc_container
*c
)
2084 if (!c
->config_path
)
2087 /* $lxc_path + "/" + c->name + "/" + "config" + '\0' */
2088 len
= strlen(c
->config_path
) + strlen(c
->name
) + strlen("config") + 3;
2089 newpath
= malloc(len
);
2093 ret
= snprintf(newpath
, len
, "%s/%s/config", c
->config_path
, c
->name
);
2094 if (ret
< 0 || ret
>= len
) {
2095 fprintf(stderr
, "Error printing out config file name\n");
2101 free(c
->configfile
);
2102 c
->configfile
= newpath
;
2107 static bool lxcapi_set_config_path(struct lxc_container
*c
, const char *path
)
2111 char *oldpath
= NULL
;
2116 if (container_mem_lock(c
))
2121 ERROR("Out of memory setting new lxc path");
2127 oldpath
= c
->config_path
;
2130 /* Since we've changed the config path, we have to change the
2131 * config file name too */
2132 if (!set_config_filename(c
)) {
2133 ERROR("Out of memory setting new config filename");
2135 free(c
->config_path
);
2136 c
->config_path
= oldpath
;
2142 container_mem_unlock(c
);
2147 static bool lxcapi_set_cgroup_item(struct lxc_container
*c
, const char *subsys
, const char *value
)
2157 if (container_disk_lock(c
))
2160 ret
= lxc_cgroup_set(subsys
, value
, c
->name
, c
->config_path
);
2162 container_disk_unlock(c
);
2166 static int lxcapi_get_cgroup_item(struct lxc_container
*c
, const char *subsys
, char *retv
, int inlen
)
2176 if (container_disk_lock(c
))
2179 ret
= lxc_cgroup_get(subsys
, retv
, inlen
, c
->name
, c
->config_path
);
2181 container_disk_unlock(c
);
2185 const char *lxc_get_global_config_item(const char *key
)
2187 return lxc_global_config_value(key
);
2190 const char *lxc_get_version(void)
2195 static int copy_file(const char *old
, const char *new)
2202 if (file_exists(new)) {
2203 ERROR("copy destination %s exists", new);
2206 ret
= stat(old
, &sbuf
);
2208 INFO("Error stat'ing %s", old
);
2212 in
= open(old
, O_RDONLY
);
2214 SYSERROR("Error opening original file %s", old
);
2217 out
= open(new, O_CREAT
| O_EXCL
| O_WRONLY
, 0644);
2219 SYSERROR("Error opening new file %s", new);
2225 len
= read(in
, buf
, 8096);
2227 SYSERROR("Error reading old file %s", old
);
2232 ret
= write(out
, buf
, len
);
2233 if (ret
< len
) { // should we retry?
2234 SYSERROR("Error: write to new file %s was interrupted", new);
2241 // we set mode, but not owner/group
2242 ret
= chmod(new, sbuf
.st_mode
);
2244 SYSERROR("Error setting mode on %s", new);
2256 static int copyhooks(struct lxc_container
*oldc
, struct lxc_container
*c
)
2259 struct lxc_list
*it
;
2262 len
= strlen(oldc
->config_path
) + strlen(oldc
->name
) + 3;
2263 cpath
= alloca(len
);
2264 ret
= snprintf(cpath
, len
, "%s/%s/", oldc
->config_path
, oldc
->name
);
2265 if (ret
< 0 || ret
>= len
)
2268 for (i
=0; i
<NUM_LXC_HOOKS
; i
++) {
2269 lxc_list_for_each(it
, &c
->lxc_conf
->hooks
[i
]) {
2270 char *hookname
= it
->elem
;
2271 char *fname
= strrchr(hookname
, '/');
2272 char tmppath
[MAXPATHLEN
];
2273 if (!fname
) // relative path - we don't support, but maybe we should
2275 if (strncmp(hookname
, cpath
, len
- 1) != 0) {
2276 // this hook is public - ignore
2279 // copy the script, and change the entry in confile
2280 ret
= snprintf(tmppath
, MAXPATHLEN
, "%s/%s/%s",
2281 c
->config_path
, c
->name
, fname
+1);
2282 if (ret
< 0 || ret
>= MAXPATHLEN
)
2284 ret
= copy_file(it
->elem
, tmppath
);
2288 it
->elem
= strdup(tmppath
);
2290 ERROR("out of memory copying hook path");
2296 c
->save_config(c
, NULL
);
2300 static void new_hwaddr(char *hwaddr
)
2303 f
= fopen("/dev/urandom", "r");
2306 int ret
= fread(&seed
, sizeof(seed
), 1, f
);
2313 snprintf(hwaddr
, 18, "00:16:3e:%02x:%02x:%02x",
2314 rand() % 255, rand() % 255, rand() % 255);
2317 static void network_new_hwaddrs(struct lxc_container
*c
)
2319 struct lxc_list
*it
;
2321 lxc_list_for_each(it
, &c
->lxc_conf
->network
) {
2322 struct lxc_netdev
*n
= it
->elem
;
2324 new_hwaddr(n
->hwaddr
);
2328 static int copy_fstab(struct lxc_container
*oldc
, struct lxc_container
*c
)
2330 char newpath
[MAXPATHLEN
];
2331 char *oldpath
= oldc
->lxc_conf
->fstab
;
2337 char *p
= strrchr(oldpath
, '/');
2340 ret
= snprintf(newpath
, MAXPATHLEN
, "%s/%s%s",
2341 c
->config_path
, c
->name
, p
);
2342 if (ret
< 0 || ret
>= MAXPATHLEN
) {
2343 ERROR("error printing new path for %s", oldpath
);
2346 if (file_exists(newpath
)) {
2347 ERROR("error: fstab file %s exists", newpath
);
2351 if (copy_file(oldpath
, newpath
) < 0) {
2352 ERROR("error: copying %s to %s", oldpath
, newpath
);
2355 free(c
->lxc_conf
->fstab
);
2356 c
->lxc_conf
->fstab
= strdup(newpath
);
2357 if (!c
->lxc_conf
->fstab
) {
2358 ERROR("error: allocating pathname");
2365 static void copy_rdepends(struct lxc_container
*c
, struct lxc_container
*c0
)
2367 char path0
[MAXPATHLEN
], path1
[MAXPATHLEN
];
2370 ret
= snprintf(path0
, MAXPATHLEN
, "%s/%s/lxc_rdepends", c0
->config_path
,
2372 if (ret
< 0 || ret
>= MAXPATHLEN
) {
2373 WARN("Error copying reverse dependencies");
2376 ret
= snprintf(path1
, MAXPATHLEN
, "%s/%s/lxc_rdepends", c
->config_path
,
2378 if (ret
< 0 || ret
>= MAXPATHLEN
) {
2379 WARN("Error copying reverse dependencies");
2382 if (copy_file(path0
, path1
) < 0) {
2383 INFO("Error copying reverse dependencies");
2388 static bool add_rdepends(struct lxc_container
*c
, struct lxc_container
*c0
)
2391 char path
[MAXPATHLEN
];
2395 ret
= snprintf(path
, MAXPATHLEN
, "%s/%s/lxc_rdepends", c
->config_path
,
2397 if (ret
< 0 || ret
>= MAXPATHLEN
)
2399 f
= fopen(path
, "a");
2403 // if anything goes wrong, just return an error
2404 if (fprintf(f
, "%s\n%s\n", c0
->config_path
, c0
->name
) < 0)
2411 static int copy_storage(struct lxc_container
*c0
, struct lxc_container
*c
,
2412 const char *newtype
, int flags
, const char *bdevdata
, uint64_t newsize
)
2417 bdev
= bdev_copy(c0
, c
->name
, c
->config_path
, newtype
, flags
,
2418 bdevdata
, newsize
, &need_rdep
);
2420 ERROR("Error copying storage");
2423 free(c
->lxc_conf
->rootfs
.path
);
2424 c
->lxc_conf
->rootfs
.path
= strdup(bdev
->src
);
2426 if (!c
->lxc_conf
->rootfs
.path
) {
2427 ERROR("Out of memory while setting storage path");
2430 if (flags
& LXC_CLONE_SNAPSHOT
)
2431 copy_rdepends(c
, c0
);
2433 if (!add_rdepends(c
, c0
))
2434 WARN("Error adding reverse dependency from %s to %s",
2438 mod_all_rdeps(c
, true);
2443 struct clone_update_data
{
2444 struct lxc_container
*c0
;
2445 struct lxc_container
*c1
;
2450 static int clone_update_rootfs(struct clone_update_data
*data
)
2452 struct lxc_container
*c0
= data
->c0
;
2453 struct lxc_container
*c
= data
->c1
;
2454 int flags
= data
->flags
;
2455 char **hookargs
= data
->hookargs
;
2457 char path
[MAXPATHLEN
];
2460 struct lxc_conf
*conf
= c
->lxc_conf
;
2462 /* update hostname in rootfs */
2463 /* we're going to mount, so run in a clean namespace to simplify cleanup */
2465 if (setgid(0) < 0) {
2466 ERROR("Failed to setgid to 0");
2469 if (setuid(0) < 0) {
2470 ERROR("Failed to setuid to 0");
2473 if (setgroups(0, NULL
) < 0)
2474 WARN("Failed to clear groups");
2476 if (unshare(CLONE_NEWNS
) < 0)
2478 bdev
= bdev_init(c
->lxc_conf
->rootfs
.path
, c
->lxc_conf
->rootfs
.mount
, NULL
);
2481 if (strcmp(bdev
->type
, "dir") != 0) {
2482 if (unshare(CLONE_NEWNS
) < 0) {
2483 ERROR("error unsharing mounts");
2486 if (bdev
->ops
->mount(bdev
) < 0)
2488 } else { // TODO come up with a better way
2491 bdev
->dest
= strdup(bdev
->src
);
2494 if (!lxc_list_empty(&conf
->hooks
[LXCHOOK_CLONE
])) {
2495 /* Start of environment variable setup for hooks */
2496 if (setenv("LXC_SRC_NAME", c0
->name
, 1)) {
2497 SYSERROR("failed to set environment variable for source container name");
2499 if (setenv("LXC_NAME", c
->name
, 1)) {
2500 SYSERROR("failed to set environment variable for container name");
2502 if (setenv("LXC_CONFIG_FILE", conf
->rcfile
, 1)) {
2503 SYSERROR("failed to set environment variable for config path");
2505 if (setenv("LXC_ROOTFS_MOUNT", bdev
->dest
, 1)) {
2506 SYSERROR("failed to set environment variable for rootfs mount");
2508 if (setenv("LXC_ROOTFS_PATH", conf
->rootfs
.path
, 1)) {
2509 SYSERROR("failed to set environment variable for rootfs mount");
2512 if (run_lxc_hooks(c
->name
, "clone", conf
, c
->get_config_path(c
), hookargs
)) {
2513 ERROR("Error executing clone hook for %s", c
->name
);
2518 if (!(flags
& LXC_CLONE_KEEPNAME
)) {
2519 ret
= snprintf(path
, MAXPATHLEN
, "%s/etc/hostname", bdev
->dest
);
2520 if (ret
< 0 || ret
>= MAXPATHLEN
)
2522 if (!file_exists(path
))
2524 if (!(fout
= fopen(path
, "w"))) {
2525 SYSERROR("unable to open %s: ignoring", path
);
2528 if (fprintf(fout
, "%s", c
->name
) < 0) {
2532 if (fclose(fout
) < 0)
2538 static int clone_update_rootfs_wrapper(void *data
)
2540 struct clone_update_data
*arg
= (struct clone_update_data
*) data
;
2541 return clone_update_rootfs(arg
);
2545 * We want to support:
2546 sudo lxc-clone -o o1 -n n1 -s -L|-fssize fssize -v|--vgname vgname \
2547 -p|--lvprefix lvprefix -t|--fstype fstype -B backingstore
2549 -s [ implies overlayfs]
2553 only rootfs gets converted (copied/snapshotted) on clone.
2556 static int create_file_dirname(char *path
)
2558 char *p
= strrchr(path
, '/');
2564 ret
= mkdir(path
, 0755);
2565 if (ret
&& errno
!= EEXIST
)
2566 SYSERROR("creating container path %s", path
);
2571 static struct lxc_container
*lxcapi_clone(struct lxc_container
*c
, const char *newname
,
2572 const char *lxcpath
, int flags
,
2573 const char *bdevtype
, const char *bdevdata
, uint64_t newsize
,
2576 struct lxc_container
*c2
= NULL
;
2577 char newpath
[MAXPATHLEN
];
2578 int ret
, storage_copied
= 0;
2580 struct clone_update_data data
;
2584 if (!c
|| !c
->is_defined(c
))
2587 if (container_mem_lock(c
))
2590 if (!is_stopped(c
)) {
2591 ERROR("error: Original container (%s) is running", c
->name
);
2595 // Make sure the container doesn't yet exist.
2596 n
= newname
? newname
: c
->name
;
2597 l
= lxcpath
? lxcpath
: c
->get_config_path(c
);
2598 ret
= snprintf(newpath
, MAXPATHLEN
, "%s/%s/config", l
, n
);
2599 if (ret
< 0 || ret
>= MAXPATHLEN
) {
2600 SYSERROR("clone: failed making config pathname");
2603 if (file_exists(newpath
)) {
2604 ERROR("error: clone: %s exists", newpath
);
2608 ret
= create_file_dirname(newpath
);
2609 if (ret
< 0 && errno
!= EEXIST
) {
2610 ERROR("Error creating container dir for %s", newpath
);
2614 // copy the configuration, tweak it as needed,
2615 fout
= fopen(newpath
, "w");
2617 SYSERROR("open %s", newpath
);
2620 write_config(fout
, c
->lxc_conf
);
2623 sprintf(newpath
, "%s/%s/rootfs", l
, n
);
2624 if (mkdir(newpath
, 0755) < 0) {
2625 SYSERROR("error creating %s", newpath
);
2630 if (chown_mapped_root(newpath
, c
->lxc_conf
) < 0) {
2631 ERROR("Error chowning %s to container root", newpath
);
2636 c2
= lxc_container_new(n
, l
);
2638 ERROR("clone: failed to create new container (%s %s)", n
, l
);
2643 if (!set_config_item_locked(c2
, "lxc.utsname", newname
)) {
2644 ERROR("Error setting new hostname");
2649 ret
= copyhooks(c
, c2
);
2651 ERROR("error copying hooks");
2655 if (copy_fstab(c
, c2
) < 0) {
2656 ERROR("error copying fstab");
2661 if (!(flags
& LXC_CLONE_KEEPMACADDR
))
2662 network_new_hwaddrs(c2
);
2664 // copy/snapshot rootfs's
2665 ret
= copy_storage(c
, c2
, bdevtype
, flags
, bdevdata
, newsize
);
2669 // We've now successfully created c2's storage, so clear it out if we
2673 if (!c2
->save_config(c2
, NULL
))
2676 if ((pid
= fork()) < 0) {
2681 ret
= wait_for_pid(pid
);
2684 container_mem_unlock(c
);
2690 data
.hookargs
= hookargs
;
2692 ret
= userns_exec_1(c
->lxc_conf
, clone_update_rootfs_wrapper
,
2695 ret
= clone_update_rootfs(&data
);
2699 container_mem_unlock(c
);
2703 container_mem_unlock(c
);
2705 if (!storage_copied
)
2706 c2
->lxc_conf
->rootfs
.path
= NULL
;
2708 lxc_container_put(c2
);
2714 static bool lxcapi_rename(struct lxc_container
*c
, const char *newname
)
2717 struct lxc_container
*newc
;
2719 if (!c
|| !c
->name
|| !c
->config_path
)
2722 bdev
= bdev_init(c
->lxc_conf
->rootfs
.path
, c
->lxc_conf
->rootfs
.mount
, NULL
);
2724 ERROR("Failed to find original backing store type");
2728 newc
= lxcapi_clone(c
, newname
, c
->config_path
, LXC_CLONE_KEEPMACADDR
, NULL
, bdev
->type
, 0, NULL
);
2731 lxc_container_put(newc
);
2735 if (newc
&& lxcapi_is_defined(newc
))
2736 lxc_container_put(newc
);
2738 if (!lxcapi_destroy(c
)) {
2739 ERROR("Could not destroy existing container %s", c
->name
);
2745 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
)
2750 return lxc_attach(c
->name
, c
->config_path
, exec_function
, exec_payload
, options
, attached_process
);
2753 static int lxcapi_attach_run_wait(struct lxc_container
*c
, lxc_attach_options_t
*options
, const char *program
, const char * const argv
[])
2755 lxc_attach_command_t command
;
2762 command
.program
= (char*)program
;
2763 command
.argv
= (char**)argv
;
2764 r
= lxc_attach(c
->name
, c
->config_path
, lxc_attach_run_command
, &command
, options
, &pid
);
2769 return lxc_wait_for_pid_status(pid
);
2772 static int get_next_index(const char *lxcpath
, char *cname
)
2778 fname
= alloca(strlen(lxcpath
) + 20);
2780 sprintf(fname
, "%s/snap%d", lxcpath
, i
);
2781 ret
= stat(fname
, &sb
);
2788 static int lxcapi_snapshot(struct lxc_container
*c
, const char *commentfile
)
2791 struct lxc_container
*c2
;
2792 char snappath
[MAXPATHLEN
], newname
[20];
2794 // /var/lib/lxc -> /var/lib/lxcsnaps \0
2795 ret
= snprintf(snappath
, MAXPATHLEN
, "%ssnaps/%s", c
->config_path
, c
->name
);
2796 if (ret
< 0 || ret
>= MAXPATHLEN
)
2798 i
= get_next_index(snappath
, c
->name
);
2800 if (mkdir_p(snappath
, 0755) < 0) {
2801 ERROR("Failed to create snapshot directory %s", snappath
);
2805 ret
= snprintf(newname
, 20, "snap%d", i
);
2806 if (ret
< 0 || ret
>= 20)
2810 * We pass LXC_CLONE_SNAPSHOT to make sure that a rdepends file entry is
2811 * created in the original container
2813 flags
= LXC_CLONE_SNAPSHOT
| LXC_CLONE_KEEPMACADDR
| LXC_CLONE_KEEPNAME
|
2814 LXC_CLONE_KEEPBDEVTYPE
| LXC_CLONE_MAYBE_SNAPSHOT
;
2815 c2
= c
->clone(c
, newname
, snappath
, flags
, NULL
, NULL
, 0, NULL
);
2817 ERROR("clone of %s:%s failed", c
->config_path
, c
->name
);
2821 lxc_container_put(c2
);
2823 // Now write down the creation time
2830 tm_info
= localtime(&timer
);
2832 strftime(buffer
, 25, "%Y:%m:%d %H:%M:%S", tm_info
);
2834 char *dfnam
= alloca(strlen(snappath
) + strlen(newname
) + 5);
2835 sprintf(dfnam
, "%s/%s/ts", snappath
, newname
);
2836 f
= fopen(dfnam
, "w");
2838 ERROR("Failed to open %s", dfnam
);
2841 if (fprintf(f
, "%s", buffer
) < 0) {
2842 SYSERROR("Writing timestamp");
2848 SYSERROR("Writing timestamp");
2853 // $p / $name / comment \0
2854 int len
= strlen(snappath
) + strlen(newname
) + 10;
2855 char *path
= alloca(len
);
2856 sprintf(path
, "%s/%s/comment", snappath
, newname
);
2857 return copy_file(commentfile
, path
) < 0 ? -1 : i
;
2863 static void lxcsnap_free(struct lxc_snapshot
*s
)
2867 if (s
->comment_pathname
)
2868 free(s
->comment_pathname
);
2875 static char *get_snapcomment_path(char* snappath
, char *name
)
2877 // $snappath/$name/comment
2878 int ret
, len
= strlen(snappath
) + strlen(name
) + 10;
2879 char *s
= malloc(len
);
2882 ret
= snprintf(s
, len
, "%s/%s/comment", snappath
, name
);
2883 if (ret
< 0 || ret
>= len
) {
2891 static char *get_timestamp(char* snappath
, char *name
)
2893 char path
[MAXPATHLEN
], *s
= NULL
;
2897 ret
= snprintf(path
, MAXPATHLEN
, "%s/%s/ts", snappath
, name
);
2898 if (ret
< 0 || ret
>= MAXPATHLEN
)
2900 fin
= fopen(path
, "r");
2903 (void) fseek(fin
, 0, SEEK_END
);
2905 (void) fseek(fin
, 0, SEEK_SET
);
2910 if (fread(s
, 1, len
, fin
) != len
) {
2911 SYSERROR("reading timestamp");
2921 static int lxcapi_snapshot_list(struct lxc_container
*c
, struct lxc_snapshot
**ret_snaps
)
2923 char snappath
[MAXPATHLEN
], path2
[MAXPATHLEN
];
2924 int dirlen
, count
= 0, ret
;
2925 struct dirent dirent
, *direntp
;
2926 struct lxc_snapshot
*snaps
=NULL
, *nsnaps
;
2929 if (!c
|| !lxcapi_is_defined(c
))
2932 // snappath is ${lxcpath}snaps/${lxcname}/
2933 dirlen
= snprintf(snappath
, MAXPATHLEN
, "%ssnaps/%s", c
->config_path
, c
->name
);
2934 if (dirlen
< 0 || dirlen
>= MAXPATHLEN
) {
2935 ERROR("path name too long");
2938 dir
= opendir(snappath
);
2940 INFO("failed to open %s - assuming no snapshots", snappath
);
2944 while (!readdir_r(dir
, &dirent
, &direntp
)) {
2948 if (!strcmp(direntp
->d_name
, "."))
2951 if (!strcmp(direntp
->d_name
, ".."))
2954 ret
= snprintf(path2
, MAXPATHLEN
, "%s/%s/config", snappath
, direntp
->d_name
);
2955 if (ret
< 0 || ret
>= MAXPATHLEN
) {
2956 ERROR("pathname too long");
2959 if (!file_exists(path2
))
2961 nsnaps
= realloc(snaps
, (count
+ 1)*sizeof(*snaps
));
2963 SYSERROR("Out of memory");
2967 snaps
[count
].free
= lxcsnap_free
;
2968 snaps
[count
].name
= strdup(direntp
->d_name
);
2969 if (!snaps
[count
].name
)
2971 snaps
[count
].lxcpath
= strdup(snappath
);
2972 if (!snaps
[count
].lxcpath
) {
2973 free(snaps
[count
].name
);
2976 snaps
[count
].comment_pathname
= get_snapcomment_path(snappath
, direntp
->d_name
);
2977 snaps
[count
].timestamp
= get_timestamp(snappath
, direntp
->d_name
);
2982 WARN("failed to close directory");
2990 for (i
=0; i
<count
; i
++)
2991 lxcsnap_free(&snaps
[i
]);
2995 WARN("failed to close directory");
2999 static bool lxcapi_snapshot_restore(struct lxc_container
*c
, const char *snapname
, const char *newname
)
3001 char clonelxcpath
[MAXPATHLEN
];
3003 struct lxc_container
*snap
, *rest
;
3007 if (!c
|| !c
->name
|| !c
->config_path
)
3010 bdev
= bdev_init(c
->lxc_conf
->rootfs
.path
, c
->lxc_conf
->rootfs
.mount
, NULL
);
3012 ERROR("Failed to find original backing store type");
3018 if (strcmp(c
->name
, newname
) == 0) {
3019 if (!lxcapi_destroy(c
)) {
3020 ERROR("Could not destroy existing container %s", newname
);
3025 ret
= snprintf(clonelxcpath
, MAXPATHLEN
, "%ssnaps/%s", c
->config_path
, c
->name
);
3026 if (ret
< 0 || ret
>= MAXPATHLEN
) {
3030 // how should we lock this?
3032 snap
= lxc_container_new(snapname
, clonelxcpath
);
3033 if (!snap
|| !lxcapi_is_defined(snap
)) {
3034 ERROR("Could not open snapshot %s", snapname
);
3035 if (snap
) lxc_container_put(snap
);
3040 rest
= lxcapi_clone(snap
, newname
, c
->config_path
, 0, bdev
->type
, NULL
, 0, NULL
);
3042 if (rest
&& lxcapi_is_defined(rest
))
3045 lxc_container_put(rest
);
3046 lxc_container_put(snap
);
3050 static bool lxcapi_snapshot_destroy(struct lxc_container
*c
, const char *snapname
)
3053 char clonelxcpath
[MAXPATHLEN
];
3054 struct lxc_container
*snap
= NULL
;
3056 if (!c
|| !c
->name
|| !c
->config_path
)
3059 ret
= snprintf(clonelxcpath
, MAXPATHLEN
, "%ssnaps/%s", c
->config_path
, c
->name
);
3060 if (ret
< 0 || ret
>= MAXPATHLEN
)
3063 snap
= lxc_container_new(snapname
, clonelxcpath
);
3064 if (!snap
|| !lxcapi_is_defined(snap
)) {
3065 ERROR("Could not find snapshot %s", snapname
);
3069 if (!lxcapi_destroy(snap
)) {
3070 ERROR("Could not destroy snapshot %s", snapname
);
3073 lxc_container_put(snap
);
3078 lxc_container_put(snap
);
3082 static bool lxcapi_may_control(struct lxc_container
*c
)
3084 return lxc_try_cmd(c
->name
, c
->config_path
) == 0;
3087 static bool do_add_remove_node(pid_t init_pid
, const char *path
, bool add
,
3090 char chrootpath
[MAXPATHLEN
];
3091 char *directory_path
= NULL
;
3095 if ((pid
= fork()) < 0) {
3096 SYSERROR("failed to fork a child helper");
3100 if (wait_for_pid(pid
) != 0) {
3101 ERROR("Failed to create note in guest");
3107 /* prepare the path */
3108 ret
= snprintf(chrootpath
, MAXPATHLEN
, "/proc/%d/root", init_pid
);
3109 if (ret
< 0 || ret
>= MAXPATHLEN
)
3112 if (chdir(chrootpath
) < 0)
3114 if (chroot(".") < 0)
3116 /* remove path if it exists */
3117 if(faccessat(AT_FDCWD
, path
, F_OK
, AT_SYMLINK_NOFOLLOW
) == 0) {
3118 if (unlink(path
) < 0) {
3119 ERROR("unlink failed");
3126 /* create any missing directories */
3127 directory_path
= dirname(strdup(path
));
3128 if (mkdir_p(directory_path
, 0755) < 0 && errno
!= EEXIST
) {
3129 ERROR("failed to create directory");
3133 /* create the device node */
3134 if (mknod(path
, st
->st_mode
, st
->st_rdev
) < 0) {
3135 ERROR("mknod failed");
3142 static bool add_remove_device_node(struct lxc_container
*c
, const char *src_path
, const char *dest_path
, bool add
)
3146 char value
[MAX_BUFFER
];
3149 /* make sure container is running */
3150 if (!c
->is_running(c
)) {
3151 ERROR("container is not running");
3155 /* use src_path if dest_path is NULL otherwise use dest_path */
3156 p
= dest_path
? dest_path
: src_path
;
3158 /* make sure we can access p */
3159 if(access(p
, F_OK
) < 0 || stat(p
, &st
) < 0)
3162 /* continue if path is character device or block device */
3163 if (S_ISCHR(st
.st_mode
))
3164 ret
= snprintf(value
, MAX_BUFFER
, "c %d:%d rwm", major(st
.st_rdev
), minor(st
.st_rdev
));
3165 else if (S_ISBLK(st
.st_mode
))
3166 ret
= snprintf(value
, MAX_BUFFER
, "b %d:%d rwm", major(st
.st_rdev
), minor(st
.st_rdev
));
3170 /* check snprintf return code */
3171 if (ret
< 0 || ret
>= MAX_BUFFER
)
3174 if (!do_add_remove_node(c
->init_pid(c
), p
, add
, &st
))
3177 /* add or remove device to/from cgroup access list */
3179 if (!c
->set_cgroup_item(c
, "devices.allow", value
)) {
3180 ERROR("set_cgroup_item failed while adding the device node");
3184 if (!c
->set_cgroup_item(c
, "devices.deny", value
)) {
3185 ERROR("set_cgroup_item failed while removing the device node");
3193 static bool lxcapi_add_device_node(struct lxc_container
*c
, const char *src_path
, const char *dest_path
)
3196 ERROR(NOT_SUPPORTED_ERROR
, __FUNCTION__
);
3199 return add_remove_device_node(c
, src_path
, dest_path
, true);
3202 static bool lxcapi_remove_device_node(struct lxc_container
*c
, const char *src_path
, const char *dest_path
)
3205 ERROR(NOT_SUPPORTED_ERROR
, __FUNCTION__
);
3208 return add_remove_device_node(c
, src_path
, dest_path
, false);
3211 static int lxcapi_attach_run_waitl(struct lxc_container
*c
, lxc_attach_options_t
*options
, const char *program
, const char *arg
, ...)
3221 argv
= lxc_va_arg_list_to_argv_const(ap
, 1);
3225 ERROR("Memory allocation error.");
3230 ret
= lxcapi_attach_run_wait(c
, options
, program
, (const char * const *)argv
);
3235 struct lxc_container
*lxc_container_new(const char *name
, const char *configpath
)
3237 struct lxc_container
*c
;
3239 c
= malloc(sizeof(*c
));
3241 fprintf(stderr
, "failed to malloc lxc_container\n");
3244 memset(c
, 0, sizeof(*c
));
3247 c
->config_path
= strdup(configpath
);
3249 c
->config_path
= strdup(lxc_global_config_value("lxc.lxcpath"));
3251 if (!c
->config_path
) {
3252 fprintf(stderr
, "Out of memory");
3256 remove_trailing_slashes(c
->config_path
);
3257 c
->name
= malloc(strlen(name
)+1);
3259 fprintf(stderr
, "Error allocating lxc_container name\n");
3262 strcpy(c
->name
, name
);
3265 if (!(c
->slock
= lxc_newlock(c
->config_path
, name
))) {
3266 fprintf(stderr
, "failed to create lock\n");
3270 if (!(c
->privlock
= lxc_newlock(NULL
, NULL
))) {
3271 fprintf(stderr
, "failed to alloc privlock\n");
3275 if (!set_config_filename(c
)) {
3276 fprintf(stderr
, "Error allocating config file pathname\n");
3280 if (file_exists(c
->configfile
) && !lxcapi_load_config(c
, NULL
))
3283 if (ongoing_create(c
) == 2) {
3284 ERROR("Error: %s creation was not completed", c
->name
);
3286 lxcapi_clear_config(c
);
3288 c
->daemonize
= true;
3291 // assign the member functions
3292 c
->is_defined
= lxcapi_is_defined
;
3293 c
->state
= lxcapi_state
;
3294 c
->is_running
= lxcapi_is_running
;
3295 c
->freeze
= lxcapi_freeze
;
3296 c
->unfreeze
= lxcapi_unfreeze
;
3297 c
->console
= lxcapi_console
;
3298 c
->console_getfd
= lxcapi_console_getfd
;
3299 c
->init_pid
= lxcapi_init_pid
;
3300 c
->load_config
= lxcapi_load_config
;
3301 c
->want_daemonize
= lxcapi_want_daemonize
;
3302 c
->want_close_all_fds
= lxcapi_want_close_all_fds
;
3303 c
->start
= lxcapi_start
;
3304 c
->startl
= lxcapi_startl
;
3305 c
->stop
= lxcapi_stop
;
3306 c
->config_file_name
= lxcapi_config_file_name
;
3307 c
->wait
= lxcapi_wait
;
3308 c
->set_config_item
= lxcapi_set_config_item
;
3309 c
->destroy
= lxcapi_destroy
;
3310 c
->rename
= lxcapi_rename
;
3311 c
->save_config
= lxcapi_save_config
;
3312 c
->get_keys
= lxcapi_get_keys
;
3313 c
->create
= lxcapi_create
;
3314 c
->createl
= lxcapi_createl
;
3315 c
->shutdown
= lxcapi_shutdown
;
3316 c
->reboot
= lxcapi_reboot
;
3317 c
->clear_config
= lxcapi_clear_config
;
3318 c
->clear_config_item
= lxcapi_clear_config_item
;
3319 c
->get_config_item
= lxcapi_get_config_item
;
3320 c
->get_running_config_item
= lxcapi_get_running_config_item
;
3321 c
->get_cgroup_item
= lxcapi_get_cgroup_item
;
3322 c
->set_cgroup_item
= lxcapi_set_cgroup_item
;
3323 c
->get_config_path
= lxcapi_get_config_path
;
3324 c
->set_config_path
= lxcapi_set_config_path
;
3325 c
->clone
= lxcapi_clone
;
3326 c
->get_interfaces
= lxcapi_get_interfaces
;
3327 c
->get_ips
= lxcapi_get_ips
;
3328 c
->attach
= lxcapi_attach
;
3329 c
->attach_run_wait
= lxcapi_attach_run_wait
;
3330 c
->attach_run_waitl
= lxcapi_attach_run_waitl
;
3331 c
->snapshot
= lxcapi_snapshot
;
3332 c
->snapshot_list
= lxcapi_snapshot_list
;
3333 c
->snapshot_restore
= lxcapi_snapshot_restore
;
3334 c
->snapshot_destroy
= lxcapi_snapshot_destroy
;
3335 c
->may_control
= lxcapi_may_control
;
3336 c
->add_device_node
= lxcapi_add_device_node
;
3337 c
->remove_device_node
= lxcapi_remove_device_node
;
3339 /* we'll allow the caller to update these later */
3340 if (lxc_log_init(NULL
, "none", NULL
, "lxc_container", 0, c
->config_path
)) {
3341 fprintf(stderr
, "failed to open log\n");
3348 lxc_container_free(c
);
3352 int lxc_get_wait_states(const char **states
)
3357 for (i
=0; i
<MAX_STATE
; i
++)
3358 states
[i
] = lxc_state2str(i
);
3363 * These next two could probably be done smarter with reusing a common function
3364 * with different iterators and tests...
3366 int list_defined_containers(const char *lxcpath
, char ***names
, struct lxc_container
***cret
)
3369 int i
, cfound
= 0, nfound
= 0;
3370 struct dirent dirent
, *direntp
;
3371 struct lxc_container
*c
;
3374 lxcpath
= lxc_global_config_value("lxc.lxcpath");
3376 dir
= opendir(lxcpath
);
3378 SYSERROR("opendir on lxcpath");
3387 while (!readdir_r(dir
, &dirent
, &direntp
)) {
3390 if (!strcmp(direntp
->d_name
, "."))
3392 if (!strcmp(direntp
->d_name
, ".."))
3395 if (!config_file_exists(lxcpath
, direntp
->d_name
))
3399 if (!add_to_array(names
, direntp
->d_name
, cfound
))
3409 c
= lxc_container_new(direntp
->d_name
, lxcpath
);
3411 INFO("Container %s:%s has a config but could not be loaded",
3412 lxcpath
, direntp
->d_name
);
3414 if(!remove_from_array(names
, direntp
->d_name
, cfound
--))
3418 if (!lxcapi_is_defined(c
)) {
3419 INFO("Container %s:%s has a config but is not defined",
3420 lxcpath
, direntp
->d_name
);
3422 if(!remove_from_array(names
, direntp
->d_name
, cfound
--))
3424 lxc_container_put(c
);
3428 if (!add_to_clist(cret
, c
, nfound
, true)) {
3429 lxc_container_put(c
);
3439 if (names
&& *names
) {
3440 for (i
=0; i
<cfound
; i
++)
3444 if (cret
&& *cret
) {
3445 for (i
=0; i
<nfound
; i
++)
3446 lxc_container_put((*cret
)[i
]);
3453 int list_active_containers(const char *lxcpath
, char ***nret
,
3454 struct lxc_container
***cret
)
3456 int i
, ret
= -1, cret_cnt
= 0, ct_name_cnt
= 0;
3459 char **ct_name
= NULL
;
3461 struct lxc_container
*c
;
3464 lxcpath
= lxc_global_config_value("lxc.lxcpath");
3465 lxcpath_len
= strlen(lxcpath
);
3472 FILE *f
= fopen("/proc/net/unix", "r");
3476 while (getline(&line
, &len
, f
) != -1) {
3477 char *p
= strrchr(line
, ' '), *p2
;
3484 if (strncmp(p
, lxcpath
, lxcpath_len
) != 0)
3490 // Now p is the start of lxc_name
3492 if (!p2
|| strncmp(p2
, "/command", 8) != 0)
3496 if (array_contains(&ct_name
, p
, ct_name_cnt
))
3499 if (!add_to_array(&ct_name
, p
, ct_name_cnt
))
3500 goto free_cret_list
;
3507 c
= lxc_container_new(p
, lxcpath
);
3509 INFO("Container %s:%s is running but could not be loaded",
3511 remove_from_array(&ct_name
, p
, ct_name_cnt
--);
3516 * If this is an anonymous container, then is_defined *can*
3517 * return false. So we don't do that check. Count on the
3518 * fact that the command socket exists.
3521 if (!add_to_clist(cret
, c
, cret_cnt
, true)) {
3522 lxc_container_put(c
);
3523 goto free_cret_list
;
3528 assert(!nret
|| !cret
|| cret_cnt
== ct_name_cnt
);
3537 if (cret
&& *cret
) {
3538 for (i
= 0; i
< cret_cnt
; i
++)
3539 lxc_container_put((*cret
)[i
]);
3545 for (i
= 0; i
< ct_name_cnt
; i
++)
3558 int list_all_containers(const char *lxcpath
, char ***nret
,
3559 struct lxc_container
***cret
)
3561 int i
, ret
, active_cnt
, ct_cnt
, ct_list_cnt
;
3564 struct lxc_container
**ct_list
= NULL
;
3566 ct_cnt
= list_defined_containers(lxcpath
, &ct_name
, NULL
);
3570 active_cnt
= list_active_containers(lxcpath
, &active_name
, NULL
);
3571 if (active_cnt
< 0) {
3576 for (i
= 0; i
< active_cnt
; i
++) {
3577 if (!array_contains(&ct_name
, active_name
[i
], ct_cnt
)) {
3578 if (!add_to_array(&ct_name
, active_name
[i
], ct_cnt
)) {
3580 goto free_active_name
;
3584 free(active_name
[i
]);
3585 active_name
[i
] = NULL
;
3591 for (i
= 0, ct_list_cnt
= 0; i
< ct_cnt
&& cret
; i
++) {
3592 struct lxc_container
*c
;
3594 c
= lxc_container_new(ct_name
[i
], lxcpath
);
3596 WARN("Container %s:%s could not be loaded", lxcpath
, ct_name
[i
]);
3597 remove_from_array(&ct_name
, ct_name
[i
], ct_cnt
--);
3601 if (!add_to_clist(&ct_list
, c
, ct_list_cnt
, false)) {
3602 lxc_container_put(c
);
3621 for (i
= 0; i
< ct_list_cnt
; i
++) {
3622 lxc_container_put(ct_list
[i
]);
3628 for (i
= 0; i
< active_cnt
; i
++) {
3630 free(active_name
[i
]);
3636 for (i
= 0; i
< ct_cnt
; i
++) {