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\n", 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\n", 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\n", 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\n", 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\n");
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
)) {
980 char **n2
= malloc(n2args
* sizeof(*n2
));
985 SYSERROR("out of memory");
989 tpath
= "lxc-usernsexec";
990 n2
[0] = "lxc-usernsexec";
991 lxc_list_for_each(it
, &conf
->id_map
) {
994 n2
= realloc(n2
, n2args
* sizeof(char *));
998 n2
[n2args
-1] = malloc(200);
1001 ret
= snprintf(n2
[n2args
-1], 200, "%c:%lu:%lu:%lu",
1002 map
->idtype
== ID_TYPE_UID
? 'u' : 'g',
1003 map
->nsid
, map
->hostid
, map
->range
);
1004 if (ret
< 0 || ret
>= 200)
1007 int hostid_mapped
= mapped_hostid(geteuid(), conf
);
1008 int extraargs
= hostid_mapped
>= 0 ? 1 : 3;
1009 n2
= realloc(n2
, (nargs
+ n2args
+ extraargs
) * sizeof(char *));
1012 if (hostid_mapped
< 0) {
1013 hostid_mapped
= find_unmapped_nsuid(conf
);
1014 n2
[n2args
++] = "-m";
1015 if (hostid_mapped
< 0) {
1016 ERROR("Could not find free uid to map");
1019 n2
[n2args
++] = malloc(200);
1020 if (!n2
[n2args
-1]) {
1021 SYSERROR("out of memory");
1024 ret
= snprintf(n2
[n2args
-1], 200, "u:%d:%d:1",
1025 hostid_mapped
, geteuid());
1026 if (ret
< 0 || ret
>= 200) {
1027 ERROR("string too long");
1031 n2
[n2args
++] = "--";
1032 for (i
= 0; i
< nargs
; i
++)
1033 n2
[i
+ n2args
] = newargv
[i
];
1035 // Finally add "--mapped-uid $uid" to tell template what to chown
1038 n2
= realloc(n2
, n2args
* sizeof(char *));
1040 SYSERROR("out of memory");
1043 // note n2[n2args-1] is NULL
1044 n2
[n2args
-3] = "--mapped-uid";
1045 snprintf(txtuid
, 20, "%d", hostid_mapped
);
1046 n2
[n2args
-2] = txtuid
;
1047 n2
[n2args
-1] = NULL
;
1052 execvp(tpath
, newargv
);
1053 SYSERROR("failed to execute template %s", tpath
);
1057 if (wait_for_pid(pid
) != 0) {
1058 ERROR("container creation template for %s failed\n", c
->name
);
1065 static bool prepend_lxc_header(char *path
, const char *t
, char *const argv
[])
1073 unsigned char md_value
[SHA_DIGEST_LENGTH
];
1077 f
= fopen(path
, "r");
1081 if (fseek(f
, 0, SEEK_END
) < 0)
1083 if ((flen
= ftell(f
)) < 0)
1085 if (fseek(f
, 0, SEEK_SET
) < 0)
1087 if ((contents
= malloc(flen
+ 1)) == NULL
)
1089 if (fread(contents
, 1, flen
, f
) != flen
)
1090 goto out_free_contents
;
1092 contents
[flen
] = '\0';
1096 goto out_free_contents
;
1099 tpath
= get_template_path(t
);
1101 ERROR("bad template: %s\n", t
);
1102 goto out_free_contents
;
1105 ret
= sha1sum_file(tpath
, md_value
);
1107 ERROR("Error getting sha1sum of %s", tpath
);
1109 goto out_free_contents
;
1114 f
= fopen(path
, "w");
1116 SYSERROR("reopening config for writing");
1120 fprintf(f
, "# Template used to create this container: %s\n", t
);
1122 fprintf(f
, "# Parameters passed to the template:");
1124 fprintf(f
, " %s", *argv
);
1130 fprintf(f
, "# Template script checksum (SHA-1): ");
1131 for (i
=0; i
<SHA_DIGEST_LENGTH
; i
++)
1132 fprintf(f
, "%02x", md_value
[i
]);
1135 fprintf(f
, "# For additional config options, please look at lxc.conf(5)\n");
1136 if (fwrite(contents
, 1, flen
, f
) != flen
) {
1137 SYSERROR("Writing original contents");
1153 SYSERROR("Error prepending header");
1159 static void lxcapi_clear_config(struct lxc_container
*c
)
1161 if (c
&& c
->lxc_conf
) {
1162 lxc_conf_free(c
->lxc_conf
);
1167 static bool lxcapi_destroy(struct lxc_container
*c
);
1170 * create a container with the given parameters.
1171 * @c: container to be created. It has the lxcpath, name, and a starting
1172 * configuration already set
1173 * @t: the template to execute to instantiate the root filesystem and
1174 * adjust the configuration.
1175 * @bdevtype: backing store type to use. If NULL, dir will be used.
1176 * @specs: additional parameters for the backing store, i.e. LVM vg to
1179 * @argv: the arguments to pass to the template, terminated by NULL. If no
1180 * arguments, you can just pass NULL.
1182 static bool lxcapi_create(struct lxc_container
*c
, const char *t
,
1183 const char *bdevtype
, struct bdev_specs
*specs
, int flags
,
1195 tpath
= get_template_path(t
);
1197 ERROR("bad template: %s\n", t
);
1203 * If a template is passed in, and the rootfs already is defined in
1204 * the container config and exists, then * caller is trying to create
1205 * an existing container. Return an error, but do NOT delete the
1208 if (lxcapi_is_defined(c
) && c
->lxc_conf
&& c
->lxc_conf
->rootfs
.path
&&
1209 access(c
->lxc_conf
->rootfs
.path
, F_OK
) == 0 && tpath
) {
1210 ERROR("Container %s:%s already exists", c
->config_path
, c
->name
);
1215 if (!c
->load_config(c
, lxc_global_config_value("lxc.default_config"))) {
1216 ERROR("Error loading default configuration file %s\n", lxc_global_config_value("lxc.default_config"));
1221 if (!create_container_dir(c
))
1225 * either template or rootfs.path should be set.
1226 * if both template and rootfs.path are set, template is setup as rootfs.path.
1227 * container is already created if we have a config and rootfs.path is accessible
1229 if (!c
->lxc_conf
->rootfs
.path
&& !tpath
)
1230 /* no template passed in and rootfs does not exist: error */
1232 if (c
->lxc_conf
->rootfs
.path
&& access(c
->lxc_conf
->rootfs
.path
, F_OK
) != 0)
1233 /* rootfs passed into configuration, but does not exist: error */
1235 if (lxcapi_is_defined(c
) && c
->lxc_conf
->rootfs
.path
&& !tpath
) {
1236 /* Rootfs already existed, user just wanted to save the
1237 * loaded configuration */
1242 /* Mark that this container is being created */
1243 if ((partial_fd
= create_partial(c
)) < 0)
1246 /* no need to get disk lock bc we have the partial locked */
1249 * Create the backing store
1250 * Note we can't do this in the same task as we use to execute the
1251 * template because of the way zfs works.
1252 * After you 'zfs create', zfs mounts the fs only in the initial
1257 SYSERROR("failed to fork task for container creation template\n");
1261 if (pid
== 0) { // child
1262 struct bdev
*bdev
= NULL
;
1264 if (!(bdev
= do_bdev_create(c
, bdevtype
, specs
))) {
1265 ERROR("Error creating backing store type %s for %s",
1266 bdevtype
? bdevtype
: "(none)", c
->name
);
1270 /* save config file again to store the new rootfs location */
1271 if (!c
->save_config(c
, NULL
)) {
1272 ERROR("failed to save starting configuration for %s\n", c
->name
);
1273 // parent task won't see bdev in config so we delete it
1274 bdev
->ops
->umount(bdev
);
1275 bdev
->ops
->destroy(bdev
);
1280 if (wait_for_pid(pid
) != 0)
1283 /* reload config to get the rootfs */
1284 lxc_conf_free(c
->lxc_conf
);
1286 if (!load_config_locked(c
, c
->configfile
))
1289 if (!create_run_template(c
, tpath
, !!(flags
& LXC_CREATE_QUIET
), argv
))
1292 // now clear out the lxc_conf we have, reload from the created
1294 lxcapi_clear_config(c
);
1297 if (!prepend_lxc_header(c
->configfile
, tpath
, argv
)) {
1298 ERROR("Error prepending header to configuration file");
1302 ret
= load_config_locked(c
, c
->configfile
);
1305 if (partial_fd
>= 0)
1306 remove_partial(c
, partial_fd
);
1316 static bool lxcapi_reboot(struct lxc_container
*c
)
1322 if (!c
->is_running(c
))
1324 pid
= c
->init_pid(c
);
1327 if (kill(pid
, SIGINT
) < 0)
1333 static bool lxcapi_shutdown(struct lxc_container
*c
, int timeout
)
1337 int haltsignal
= SIGPWR
;
1342 if (!c
->is_running(c
))
1344 pid
= c
->init_pid(c
);
1347 if (c
->lxc_conf
&& c
->lxc_conf
->haltsignal
)
1348 haltsignal
= c
->lxc_conf
->haltsignal
;
1349 kill(pid
, haltsignal
);
1350 retv
= c
->wait(c
, "STOPPED", timeout
);
1354 static bool lxcapi_createl(struct lxc_container
*c
, const char *t
,
1355 const char *bdevtype
, struct bdev_specs
*specs
, int flags
, ...)
1365 * since we're going to wait for create to finish, I don't think we
1366 * need to get a copy of the arguments.
1368 va_start(ap
, flags
);
1369 args
= lxc_va_arg_list_to_argv(ap
, 0, 0);
1372 ERROR("Memory allocation error.");
1376 bret
= c
->create(c
, t
, bdevtype
, specs
, flags
, args
);
1383 static bool lxcapi_clear_config_item(struct lxc_container
*c
, const char *key
)
1387 if (!c
|| !c
->lxc_conf
)
1389 if (container_mem_lock(c
))
1391 ret
= lxc_clear_config_item(c
->lxc_conf
, key
);
1392 container_mem_unlock(c
);
1396 static inline bool enter_to_ns(struct lxc_container
*c
) {
1397 int netns
, userns
, ret
= 0, init_pid
= 0;;
1398 char new_netns_path
[MAXPATHLEN
];
1399 char new_userns_path
[MAXPATHLEN
];
1401 if (!c
->is_running(c
))
1404 init_pid
= c
->init_pid(c
);
1406 /* Switch to new userns */
1407 if (geteuid() && access("/proc/self/ns/user", F_OK
) == 0) {
1408 ret
= snprintf(new_userns_path
, MAXPATHLEN
, "/proc/%d/ns/user", init_pid
);
1409 if (ret
< 0 || ret
>= MAXPATHLEN
)
1412 userns
= open(new_userns_path
, O_RDONLY
);
1414 SYSERROR("failed to open %s", new_userns_path
);
1418 if (setns(userns
, CLONE_NEWUSER
)) {
1419 SYSERROR("failed to setns for CLONE_NEWUSER");
1426 /* Switch to new netns */
1427 ret
= snprintf(new_netns_path
, MAXPATHLEN
, "/proc/%d/ns/net", init_pid
);
1428 if (ret
< 0 || ret
>= MAXPATHLEN
)
1431 netns
= open(new_netns_path
, O_RDONLY
);
1433 SYSERROR("failed to open %s", new_netns_path
);
1437 if (setns(netns
, CLONE_NEWNET
)) {
1438 SYSERROR("failed to setns for CLONE_NEWNET");
1448 // used by qsort and bsearch functions for comparing names
1449 static inline int string_cmp(char **first
, char **second
)
1451 return strcmp(*first
, *second
);
1454 // used by qsort and bsearch functions for comparing container names
1455 static inline int container_cmp(struct lxc_container
**first
, struct lxc_container
**second
)
1457 return strcmp((*first
)->name
, (*second
)->name
);
1460 static bool add_to_array(char ***names
, char *cname
, int pos
)
1462 char **newnames
= realloc(*names
, (pos
+1) * sizeof(char *));
1464 ERROR("Out of memory");
1469 newnames
[pos
] = strdup(cname
);
1473 // sort the arrray as we will use binary search on it
1474 qsort(newnames
, pos
+ 1, sizeof(char *), (int (*)(const void *,const void *))string_cmp
);
1479 static bool add_to_clist(struct lxc_container
***list
, struct lxc_container
*c
, int pos
, bool sort
)
1481 struct lxc_container
**newlist
= realloc(*list
, (pos
+1) * sizeof(struct lxc_container
*));
1483 ERROR("Out of memory");
1490 // sort the arrray as we will use binary search on it
1492 qsort(newlist
, pos
+ 1, sizeof(struct lxc_container
*), (int (*)(const void *,const void *))container_cmp
);
1497 static char** get_from_array(char ***names
, char *cname
, int size
)
1499 return (char **)bsearch(&cname
, *names
, size
, sizeof(char *), (int (*)(const void *, const void *))string_cmp
);
1503 static bool array_contains(char ***names
, char *cname
, int size
) {
1504 if(get_from_array(names
, cname
, size
) != NULL
)
1509 static bool remove_from_array(char ***names
, char *cname
, int size
)
1511 char **result
= get_from_array(names
, cname
, size
);
1512 if (result
!= NULL
) {
1519 static char** lxcapi_get_interfaces(struct lxc_container
*c
)
1522 int i
, count
= 0, pipefd
[2];
1523 char **interfaces
= NULL
;
1524 char interface
[IFNAMSIZ
];
1526 if(pipe(pipefd
) < 0) {
1527 SYSERROR("pipe failed");
1533 SYSERROR("failed to fork task to get interfaces information\n");
1539 if (pid
== 0) { // child
1540 int ret
= 1, nbytes
;
1541 struct ifaddrs
*interfaceArray
= NULL
, *tempIfAddr
= NULL
;
1543 /* close the read-end of the pipe */
1546 if (!enter_to_ns(c
)) {
1547 SYSERROR("failed to enter namespace");
1551 /* Grab the list of interfaces */
1552 if (getifaddrs(&interfaceArray
)) {
1553 SYSERROR("failed to get interfaces list");
1557 /* Iterate through the interfaces */
1558 for (tempIfAddr
= interfaceArray
; tempIfAddr
!= NULL
; tempIfAddr
= tempIfAddr
->ifa_next
) {
1559 nbytes
= write(pipefd
[1], tempIfAddr
->ifa_name
, IFNAMSIZ
);
1561 ERROR("write failed");
1570 freeifaddrs(interfaceArray
);
1572 /* close the write-end of the pipe, thus sending EOF to the reader */
1577 /* close the write-end of the pipe */
1580 while (read(pipefd
[0], &interface
, IFNAMSIZ
) == IFNAMSIZ
) {
1581 if (array_contains(&interfaces
, interface
, count
))
1584 if(!add_to_array(&interfaces
, interface
, count
))
1585 ERROR("PARENT: add_to_array failed");
1589 if (wait_for_pid(pid
) != 0) {
1590 for(i
=0;i
<count
;i
++)
1591 free(interfaces
[i
]);
1596 /* close the read-end of the pipe */
1599 /* Append NULL to the array */
1601 interfaces
= (char **)lxc_append_null_to_array((void **)interfaces
, count
);
1606 static char** lxcapi_get_ips(struct lxc_container
*c
, const char* interface
, const char* family
, int scope
)
1609 int i
, count
= 0, pipefd
[2];
1610 char **addresses
= NULL
;
1611 char address
[INET6_ADDRSTRLEN
];
1613 if(pipe(pipefd
) < 0) {
1614 SYSERROR("pipe failed");
1620 SYSERROR("failed to fork task to get container ips\n");
1626 if (pid
== 0) { // child
1627 int ret
= 1, nbytes
;
1628 struct ifaddrs
*interfaceArray
= NULL
, *tempIfAddr
= NULL
;
1629 char addressOutputBuffer
[INET6_ADDRSTRLEN
];
1630 void *tempAddrPtr
= NULL
;
1631 char *address
= NULL
;
1633 /* close the read-end of the pipe */
1636 if (!enter_to_ns(c
)) {
1637 SYSERROR("failed to enter namespace");
1641 /* Grab the list of interfaces */
1642 if (getifaddrs(&interfaceArray
)) {
1643 SYSERROR("failed to get interfaces list");
1647 /* Iterate through the interfaces */
1648 for (tempIfAddr
= interfaceArray
; tempIfAddr
!= NULL
; tempIfAddr
= tempIfAddr
->ifa_next
) {
1649 if (tempIfAddr
->ifa_addr
== NULL
)
1652 if(tempIfAddr
->ifa_addr
->sa_family
== AF_INET
) {
1653 if (family
&& strcmp(family
, "inet"))
1655 tempAddrPtr
= &((struct sockaddr_in
*)tempIfAddr
->ifa_addr
)->sin_addr
;
1658 if (family
&& strcmp(family
, "inet6"))
1661 if (((struct sockaddr_in6
*)tempIfAddr
->ifa_addr
)->sin6_scope_id
!= scope
)
1664 tempAddrPtr
= &((struct sockaddr_in6
*)tempIfAddr
->ifa_addr
)->sin6_addr
;
1667 if (interface
&& strcmp(interface
, tempIfAddr
->ifa_name
))
1669 else if (!interface
&& strcmp("lo", tempIfAddr
->ifa_name
) == 0)
1672 address
= (char *)inet_ntop(tempIfAddr
->ifa_addr
->sa_family
,
1674 addressOutputBuffer
,
1675 sizeof(addressOutputBuffer
));
1679 nbytes
= write(pipefd
[1], address
, INET6_ADDRSTRLEN
);
1681 ERROR("write failed");
1690 freeifaddrs(interfaceArray
);
1692 /* close the write-end of the pipe, thus sending EOF to the reader */
1697 /* close the write-end of the pipe */
1700 while (read(pipefd
[0], &address
, INET6_ADDRSTRLEN
) == INET6_ADDRSTRLEN
) {
1701 if(!add_to_array(&addresses
, address
, count
))
1702 ERROR("PARENT: add_to_array failed");
1706 if (wait_for_pid(pid
) != 0) {
1707 for(i
=0;i
<count
;i
++)
1713 /* close the read-end of the pipe */
1716 /* Append NULL to the array */
1718 addresses
= (char **)lxc_append_null_to_array((void **)addresses
, count
);
1723 static int lxcapi_get_config_item(struct lxc_container
*c
, const char *key
, char *retv
, int inlen
)
1727 if (!c
|| !c
->lxc_conf
)
1729 if (container_mem_lock(c
))
1731 ret
= lxc_get_config_item(c
->lxc_conf
, key
, retv
, inlen
);
1732 container_mem_unlock(c
);
1736 static char* lxcapi_get_running_config_item(struct lxc_container
*c
, const char *key
)
1740 if (!c
|| !c
->lxc_conf
)
1742 if (container_mem_lock(c
))
1744 ret
= lxc_cmd_get_config_item(c
->name
, key
, c
->get_config_path(c
));
1745 container_mem_unlock(c
);
1749 static int lxcapi_get_keys(struct lxc_container
*c
, const char *key
, char *retv
, int inlen
)
1752 return lxc_listconfigs(retv
, inlen
);
1754 * Support 'lxc.network.<idx>', i.e. 'lxc.network.0'
1755 * This is an intelligent result to show which keys are valid given
1756 * the type of nic it is
1758 if (!c
|| !c
->lxc_conf
)
1760 if (container_mem_lock(c
))
1763 if (strncmp(key
, "lxc.network.", 12) == 0)
1764 ret
= lxc_list_nicconfigs(c
->lxc_conf
, key
, retv
, inlen
);
1765 container_mem_unlock(c
);
1769 static bool lxcapi_save_config(struct lxc_container
*c
, const char *alt_file
)
1772 bool ret
= false, need_disklock
= false;
1776 alt_file
= c
->configfile
;
1778 return false; // should we write to stdout if no file is specified?
1780 // If we haven't yet loaded a config, load the stock config
1782 if (!c
->load_config(c
, lxc_global_config_value("lxc.default_config"))) {
1783 ERROR("Error loading default configuration file %s while saving %s\n", lxc_global_config_value("lxc.default_config"), c
->name
);
1788 if (!create_container_dir(c
))
1792 * If we're writing to the container's config file, take the
1793 * disk lock. Otherwise just take the memlock to protect the
1794 * struct lxc_container while we're traversing it.
1796 if (strcmp(c
->configfile
, alt_file
) == 0)
1797 need_disklock
= true;
1800 lret
= container_disk_lock(c
);
1802 lret
= container_mem_lock(c
);
1807 fout
= fopen(alt_file
, "w");
1810 write_config(fout
, c
->lxc_conf
);
1816 container_disk_unlock(c
);
1818 container_mem_unlock(c
);
1822 static bool mod_rdep(struct lxc_container
*c
, bool inc
)
1824 char path
[MAXPATHLEN
];
1829 if (container_disk_lock(c
))
1831 ret
= snprintf(path
, MAXPATHLEN
, "%s/%s/lxc_snapshots", c
->config_path
,
1833 if (ret
< 0 || ret
> MAXPATHLEN
)
1835 f
= fopen(path
, "r");
1837 ret
= fscanf(f
, "%d", &v
);
1840 ERROR("Corrupted file %s", path
);
1845 f
= fopen(path
, "w");
1848 if (fprintf(f
, "%d\n", v
) < 0) {
1849 ERROR("Error writing new snapshots value");
1855 SYSERROR("Error writing to or closing snapshots file");
1862 container_disk_unlock(c
);
1866 static void strip_newline(char *p
)
1868 size_t len
= strlen(p
);
1871 if (p
[len
-1] == '\n')
1875 static void mod_all_rdeps(struct lxc_container
*c
, bool inc
)
1877 struct lxc_container
*p
;
1878 char *lxcpath
= NULL
, *lxcname
= NULL
, path
[MAXPATHLEN
];
1879 size_t pathlen
= 0, namelen
= 0;
1883 ret
= snprintf(path
, MAXPATHLEN
, "%s/%s/lxc_rdepends",
1884 c
->config_path
, c
->name
);
1885 if (ret
< 0 || ret
>= MAXPATHLEN
) {
1886 ERROR("Path name too long");
1889 f
= fopen(path
, "r");
1892 while (getline(&lxcpath
, &pathlen
, f
) != -1) {
1893 if (getline(&lxcname
, &namelen
, f
) == -1) {
1894 ERROR("badly formatted file %s\n", path
);
1897 strip_newline(lxcpath
);
1898 strip_newline(lxcname
);
1899 if ((p
= lxc_container_new(lxcname
, lxcpath
)) == NULL
) {
1900 ERROR("Unable to find dependent container %s:%s",
1904 if (!mod_rdep(p
, inc
))
1905 ERROR("Failed to increase numsnapshots for %s:%s",
1907 lxc_container_put(p
);
1910 if (lxcpath
) free(lxcpath
);
1911 if (lxcname
) free(lxcname
);
1915 static bool has_snapshots(struct lxc_container
*c
)
1917 char path
[MAXPATHLEN
];
1922 ret
= snprintf(path
, MAXPATHLEN
, "%s/%s/lxc_snapshots", c
->config_path
,
1924 if (ret
< 0 || ret
> MAXPATHLEN
)
1926 f
= fopen(path
, "r");
1929 ret
= fscanf(f
, "%d", &v
);
1939 static int lxc_rmdir_onedev_wrapper(void *data
)
1941 char *arg
= (char *) data
;
1942 return lxc_rmdir_onedev(arg
);
1945 // do we want the api to support --force, or leave that to the caller?
1946 static bool lxcapi_destroy(struct lxc_container
*c
)
1948 struct bdev
*r
= NULL
;
1952 if (!c
|| !lxcapi_is_defined(c
))
1955 if (container_disk_lock(c
))
1958 if (!is_stopped(c
)) {
1959 // we should queue some sort of error - in c->error_string?
1960 ERROR("container %s is not stopped", c
->name
);
1964 if (c
->lxc_conf
&& has_snapshots(c
)) {
1965 ERROR("container %s has dependent snapshots", c
->name
);
1969 if (!am_unpriv() && c
->lxc_conf
&& c
->lxc_conf
->rootfs
.path
&& c
->lxc_conf
->rootfs
.mount
) {
1970 r
= bdev_init(c
->lxc_conf
->rootfs
.path
, c
->lxc_conf
->rootfs
.mount
, NULL
);
1972 if (r
->ops
->destroy(r
) < 0) {
1974 ERROR("Error destroying rootfs for %s", c
->name
);
1981 mod_all_rdeps(c
, false);
1983 const char *p1
= lxcapi_get_config_path(c
);
1984 char *path
= alloca(strlen(p1
) + strlen(c
->name
) + 2);
1985 sprintf(path
, "%s/%s", p1
, c
->name
);
1987 ret
= userns_exec_1(c
->lxc_conf
, lxc_rmdir_onedev_wrapper
, path
);
1989 ret
= lxc_rmdir_onedev(path
);
1991 ERROR("Error destroying container directory for %s", c
->name
);
1997 container_disk_unlock(c
);
2001 static bool set_config_item_locked(struct lxc_container
*c
, const char *key
, const char *v
)
2003 struct lxc_config_t
*config
;
2006 c
->lxc_conf
= lxc_conf_init();
2009 config
= lxc_getconfig(key
);
2012 return (0 == config
->cb(key
, v
, c
->lxc_conf
));
2015 static bool lxcapi_set_config_item(struct lxc_container
*c
, const char *key
, const char *v
)
2022 if (container_mem_lock(c
))
2025 b
= set_config_item_locked(c
, key
, v
);
2027 container_mem_unlock(c
);
2031 static char *lxcapi_config_file_name(struct lxc_container
*c
)
2033 if (!c
|| !c
->configfile
)
2035 return strdup(c
->configfile
);
2038 static const char *lxcapi_get_config_path(struct lxc_container
*c
)
2040 if (!c
|| !c
->config_path
)
2042 return (const char *)(c
->config_path
);
2047 * Just recalculate the c->configfile based on the
2048 * c->config_path, which must be set.
2049 * The lxc_container must be locked or not yet public.
2051 static bool set_config_filename(struct lxc_container
*c
)
2056 if (!c
->config_path
)
2059 /* $lxc_path + "/" + c->name + "/" + "config" + '\0' */
2060 len
= strlen(c
->config_path
) + strlen(c
->name
) + strlen("config") + 3;
2061 newpath
= malloc(len
);
2065 ret
= snprintf(newpath
, len
, "%s/%s/config", c
->config_path
, c
->name
);
2066 if (ret
< 0 || ret
>= len
) {
2067 fprintf(stderr
, "Error printing out config file name\n");
2073 free(c
->configfile
);
2074 c
->configfile
= newpath
;
2079 static bool lxcapi_set_config_path(struct lxc_container
*c
, const char *path
)
2083 char *oldpath
= NULL
;
2088 if (container_mem_lock(c
))
2093 ERROR("Out of memory setting new lxc path");
2099 oldpath
= c
->config_path
;
2102 /* Since we've changed the config path, we have to change the
2103 * config file name too */
2104 if (!set_config_filename(c
)) {
2105 ERROR("Out of memory setting new config filename");
2107 free(c
->config_path
);
2108 c
->config_path
= oldpath
;
2114 container_mem_unlock(c
);
2119 static bool lxcapi_set_cgroup_item(struct lxc_container
*c
, const char *subsys
, const char *value
)
2129 if (container_disk_lock(c
))
2132 ret
= lxc_cgroup_set(subsys
, value
, c
->name
, c
->config_path
);
2134 container_disk_unlock(c
);
2138 static int lxcapi_get_cgroup_item(struct lxc_container
*c
, const char *subsys
, char *retv
, int inlen
)
2148 if (container_disk_lock(c
))
2151 ret
= lxc_cgroup_get(subsys
, retv
, inlen
, c
->name
, c
->config_path
);
2153 container_disk_unlock(c
);
2157 const char *lxc_get_global_config_item(const char *key
)
2159 return lxc_global_config_value(key
);
2162 const char *lxc_get_version(void)
2167 static int copy_file(const char *old
, const char *new)
2174 if (file_exists(new)) {
2175 ERROR("copy destination %s exists", new);
2178 ret
= stat(old
, &sbuf
);
2180 INFO("Error stat'ing %s", old
);
2184 in
= open(old
, O_RDONLY
);
2186 SYSERROR("Error opening original file %s", old
);
2189 out
= open(new, O_CREAT
| O_EXCL
| O_WRONLY
, 0644);
2191 SYSERROR("Error opening new file %s", new);
2197 len
= read(in
, buf
, 8096);
2199 SYSERROR("Error reading old file %s", old
);
2204 ret
= write(out
, buf
, len
);
2205 if (ret
< len
) { // should we retry?
2206 SYSERROR("Error: write to new file %s was interrupted", new);
2213 // we set mode, but not owner/group
2214 ret
= chmod(new, sbuf
.st_mode
);
2216 SYSERROR("Error setting mode on %s", new);
2228 static int copyhooks(struct lxc_container
*oldc
, struct lxc_container
*c
)
2231 struct lxc_list
*it
;
2234 len
= strlen(oldc
->config_path
) + strlen(oldc
->name
) + 3;
2235 cpath
= alloca(len
);
2236 ret
= snprintf(cpath
, len
, "%s/%s/", oldc
->config_path
, oldc
->name
);
2237 if (ret
< 0 || ret
>= len
)
2240 for (i
=0; i
<NUM_LXC_HOOKS
; i
++) {
2241 lxc_list_for_each(it
, &c
->lxc_conf
->hooks
[i
]) {
2242 char *hookname
= it
->elem
;
2243 char *fname
= strrchr(hookname
, '/');
2244 char tmppath
[MAXPATHLEN
];
2245 if (!fname
) // relative path - we don't support, but maybe we should
2247 if (strncmp(hookname
, cpath
, len
- 1) != 0) {
2248 // this hook is public - ignore
2251 // copy the script, and change the entry in confile
2252 ret
= snprintf(tmppath
, MAXPATHLEN
, "%s/%s/%s",
2253 c
->config_path
, c
->name
, fname
+1);
2254 if (ret
< 0 || ret
>= MAXPATHLEN
)
2256 ret
= copy_file(it
->elem
, tmppath
);
2260 it
->elem
= strdup(tmppath
);
2262 ERROR("out of memory copying hook path");
2268 c
->save_config(c
, NULL
);
2272 static void new_hwaddr(char *hwaddr
)
2275 f
= fopen("/dev/urandom", "r");
2278 int ret
= fread(&seed
, sizeof(seed
), 1, f
);
2285 snprintf(hwaddr
, 18, "00:16:3e:%02x:%02x:%02x",
2286 rand() % 255, rand() % 255, rand() % 255);
2289 static void network_new_hwaddrs(struct lxc_container
*c
)
2291 struct lxc_list
*it
;
2293 lxc_list_for_each(it
, &c
->lxc_conf
->network
) {
2294 struct lxc_netdev
*n
= it
->elem
;
2296 new_hwaddr(n
->hwaddr
);
2300 static int copy_fstab(struct lxc_container
*oldc
, struct lxc_container
*c
)
2302 char newpath
[MAXPATHLEN
];
2303 char *oldpath
= oldc
->lxc_conf
->fstab
;
2309 char *p
= strrchr(oldpath
, '/');
2312 ret
= snprintf(newpath
, MAXPATHLEN
, "%s/%s%s",
2313 c
->config_path
, c
->name
, p
);
2314 if (ret
< 0 || ret
>= MAXPATHLEN
) {
2315 ERROR("error printing new path for %s", oldpath
);
2318 if (file_exists(newpath
)) {
2319 ERROR("error: fstab file %s exists", newpath
);
2323 if (copy_file(oldpath
, newpath
) < 0) {
2324 ERROR("error: copying %s to %s", oldpath
, newpath
);
2327 free(c
->lxc_conf
->fstab
);
2328 c
->lxc_conf
->fstab
= strdup(newpath
);
2329 if (!c
->lxc_conf
->fstab
) {
2330 ERROR("error: allocating pathname");
2337 static void copy_rdepends(struct lxc_container
*c
, struct lxc_container
*c0
)
2339 char path0
[MAXPATHLEN
], path1
[MAXPATHLEN
];
2342 ret
= snprintf(path0
, MAXPATHLEN
, "%s/%s/lxc_rdepends", c0
->config_path
,
2344 if (ret
< 0 || ret
>= MAXPATHLEN
) {
2345 WARN("Error copying reverse dependencies");
2348 ret
= snprintf(path1
, MAXPATHLEN
, "%s/%s/lxc_rdepends", c
->config_path
,
2350 if (ret
< 0 || ret
>= MAXPATHLEN
) {
2351 WARN("Error copying reverse dependencies");
2354 if (copy_file(path0
, path1
) < 0) {
2355 INFO("Error copying reverse dependencies");
2360 static bool add_rdepends(struct lxc_container
*c
, struct lxc_container
*c0
)
2363 char path
[MAXPATHLEN
];
2367 ret
= snprintf(path
, MAXPATHLEN
, "%s/%s/lxc_rdepends", c
->config_path
,
2369 if (ret
< 0 || ret
>= MAXPATHLEN
)
2371 f
= fopen(path
, "a");
2375 // if anything goes wrong, just return an error
2376 if (fprintf(f
, "%s\n%s\n", c0
->config_path
, c0
->name
) < 0)
2383 static int copy_storage(struct lxc_container
*c0
, struct lxc_container
*c
,
2384 const char *newtype
, int flags
, const char *bdevdata
, uint64_t newsize
)
2389 bdev
= bdev_copy(c0
, c
->name
, c
->config_path
, newtype
, flags
,
2390 bdevdata
, newsize
, &need_rdep
);
2392 ERROR("Error copying storage");
2395 free(c
->lxc_conf
->rootfs
.path
);
2396 c
->lxc_conf
->rootfs
.path
= strdup(bdev
->src
);
2398 if (!c
->lxc_conf
->rootfs
.path
) {
2399 ERROR("Out of memory while setting storage path");
2402 if (flags
& LXC_CLONE_SNAPSHOT
)
2403 copy_rdepends(c
, c0
);
2405 if (!add_rdepends(c
, c0
))
2406 WARN("Error adding reverse dependency from %s to %s",
2410 mod_all_rdeps(c
, true);
2415 struct clone_update_data
{
2416 struct lxc_container
*c0
;
2417 struct lxc_container
*c1
;
2422 static int clone_update_rootfs(struct clone_update_data
*data
)
2424 struct lxc_container
*c0
= data
->c0
;
2425 struct lxc_container
*c
= data
->c1
;
2426 int flags
= data
->flags
;
2427 char **hookargs
= data
->hookargs
;
2429 char path
[MAXPATHLEN
];
2432 struct lxc_conf
*conf
= c
->lxc_conf
;
2434 /* update hostname in rootfs */
2435 /* we're going to mount, so run in a clean namespace to simplify cleanup */
2437 if (setgid(0) < 0) {
2438 ERROR("Failed to setgid to 0");
2441 if (setuid(0) < 0) {
2442 ERROR("Failed to setuid to 0");
2445 if (setgroups(0, NULL
) < 0)
2446 WARN("Failed to clear groups");
2448 if (unshare(CLONE_NEWNS
) < 0)
2450 bdev
= bdev_init(c
->lxc_conf
->rootfs
.path
, c
->lxc_conf
->rootfs
.mount
, NULL
);
2453 if (strcmp(bdev
->type
, "dir") != 0) {
2454 if (unshare(CLONE_NEWNS
) < 0) {
2455 ERROR("error unsharing mounts");
2458 if (bdev
->ops
->mount(bdev
) < 0)
2460 } else { // TODO come up with a better way
2463 bdev
->dest
= strdup(bdev
->src
);
2466 if (!lxc_list_empty(&conf
->hooks
[LXCHOOK_CLONE
])) {
2467 /* Start of environment variable setup for hooks */
2468 if (setenv("LXC_SRC_NAME", c0
->name
, 1)) {
2469 SYSERROR("failed to set environment variable for source container name");
2471 if (setenv("LXC_NAME", c
->name
, 1)) {
2472 SYSERROR("failed to set environment variable for container name");
2474 if (setenv("LXC_CONFIG_FILE", conf
->rcfile
, 1)) {
2475 SYSERROR("failed to set environment variable for config path");
2477 if (setenv("LXC_ROOTFS_MOUNT", bdev
->dest
, 1)) {
2478 SYSERROR("failed to set environment variable for rootfs mount");
2480 if (setenv("LXC_ROOTFS_PATH", conf
->rootfs
.path
, 1)) {
2481 SYSERROR("failed to set environment variable for rootfs mount");
2484 if (run_lxc_hooks(c
->name
, "clone", conf
, c
->get_config_path(c
), hookargs
)) {
2485 ERROR("Error executing clone hook for %s", c
->name
);
2490 if (!(flags
& LXC_CLONE_KEEPNAME
)) {
2491 ret
= snprintf(path
, MAXPATHLEN
, "%s/etc/hostname", bdev
->dest
);
2492 if (ret
< 0 || ret
>= MAXPATHLEN
)
2494 if (!file_exists(path
))
2496 if (!(fout
= fopen(path
, "w"))) {
2497 SYSERROR("unable to open %s: ignoring\n", path
);
2500 if (fprintf(fout
, "%s", c
->name
) < 0) {
2504 if (fclose(fout
) < 0)
2510 static int clone_update_rootfs_wrapper(void *data
)
2512 struct clone_update_data
*arg
= (struct clone_update_data
*) data
;
2513 return clone_update_rootfs(arg
);
2517 * We want to support:
2518 sudo lxc-clone -o o1 -n n1 -s -L|-fssize fssize -v|--vgname vgname \
2519 -p|--lvprefix lvprefix -t|--fstype fstype -B backingstore
2521 -s [ implies overlayfs]
2525 only rootfs gets converted (copied/snapshotted) on clone.
2528 static int create_file_dirname(char *path
)
2530 char *p
= strrchr(path
, '/');
2536 ret
= mkdir(path
, 0755);
2537 if (ret
&& errno
!= EEXIST
)
2538 SYSERROR("creating container path %s\n", path
);
2543 static struct lxc_container
*lxcapi_clone(struct lxc_container
*c
, const char *newname
,
2544 const char *lxcpath
, int flags
,
2545 const char *bdevtype
, const char *bdevdata
, uint64_t newsize
,
2548 struct lxc_container
*c2
= NULL
;
2549 char newpath
[MAXPATHLEN
];
2550 int ret
, storage_copied
= 0;
2552 struct clone_update_data data
;
2556 if (!c
|| !c
->is_defined(c
))
2559 if (container_mem_lock(c
))
2562 if (!is_stopped(c
)) {
2563 ERROR("error: Original container (%s) is running", c
->name
);
2567 // Make sure the container doesn't yet exist.
2568 n
= newname
? newname
: c
->name
;
2569 l
= lxcpath
? lxcpath
: c
->get_config_path(c
);
2570 ret
= snprintf(newpath
, MAXPATHLEN
, "%s/%s/config", l
, n
);
2571 if (ret
< 0 || ret
>= MAXPATHLEN
) {
2572 SYSERROR("clone: failed making config pathname");
2575 if (file_exists(newpath
)) {
2576 ERROR("error: clone: %s exists", newpath
);
2580 ret
= create_file_dirname(newpath
);
2581 if (ret
< 0 && errno
!= EEXIST
) {
2582 ERROR("Error creating container dir for %s", newpath
);
2586 // copy the configuration, tweak it as needed,
2587 fout
= fopen(newpath
, "w");
2589 SYSERROR("open %s", newpath
);
2592 write_config(fout
, c
->lxc_conf
);
2595 sprintf(newpath
, "%s/%s/rootfs", l
, n
);
2596 if (mkdir(newpath
, 0755) < 0) {
2597 SYSERROR("error creating %s", newpath
);
2602 if (chown_mapped_root(newpath
, c
->lxc_conf
) < 0) {
2603 ERROR("Error chowning %s to container root\n", newpath
);
2608 c2
= lxc_container_new(n
, l
);
2610 ERROR("clone: failed to create new container (%s %s)", n
, l
);
2615 if (!set_config_item_locked(c2
, "lxc.utsname", newname
)) {
2616 ERROR("Error setting new hostname");
2621 ret
= copyhooks(c
, c2
);
2623 ERROR("error copying hooks");
2627 if (copy_fstab(c
, c2
) < 0) {
2628 ERROR("error copying fstab");
2633 if (!(flags
& LXC_CLONE_KEEPMACADDR
))
2634 network_new_hwaddrs(c2
);
2636 // copy/snapshot rootfs's
2637 ret
= copy_storage(c
, c2
, bdevtype
, flags
, bdevdata
, newsize
);
2641 // We've now successfully created c2's storage, so clear it out if we
2645 if (!c2
->save_config(c2
, NULL
))
2648 if ((pid
= fork()) < 0) {
2653 ret
= wait_for_pid(pid
);
2656 container_mem_unlock(c
);
2662 data
.hookargs
= hookargs
;
2664 ret
= userns_exec_1(c
->lxc_conf
, clone_update_rootfs_wrapper
,
2667 ret
= clone_update_rootfs(&data
);
2671 container_mem_unlock(c
);
2675 container_mem_unlock(c
);
2677 if (!storage_copied
)
2678 c2
->lxc_conf
->rootfs
.path
= NULL
;
2680 lxc_container_put(c2
);
2686 static bool lxcapi_rename(struct lxc_container
*c
, const char *newname
)
2689 struct lxc_container
*newc
;
2691 if (!c
|| !c
->name
|| !c
->config_path
)
2694 bdev
= bdev_init(c
->lxc_conf
->rootfs
.path
, c
->lxc_conf
->rootfs
.mount
, NULL
);
2696 ERROR("Failed to find original backing store type");
2700 newc
= lxcapi_clone(c
, newname
, c
->config_path
, LXC_CLONE_KEEPMACADDR
, NULL
, bdev
->type
, 0, NULL
);
2703 lxc_container_put(newc
);
2707 if (newc
&& lxcapi_is_defined(newc
))
2708 lxc_container_put(newc
);
2710 if (!lxcapi_destroy(c
)) {
2711 ERROR("Could not destroy existing container %s", c
->name
);
2717 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
)
2722 return lxc_attach(c
->name
, c
->config_path
, exec_function
, exec_payload
, options
, attached_process
);
2725 static int lxcapi_attach_run_wait(struct lxc_container
*c
, lxc_attach_options_t
*options
, const char *program
, const char * const argv
[])
2727 lxc_attach_command_t command
;
2734 command
.program
= (char*)program
;
2735 command
.argv
= (char**)argv
;
2736 r
= lxc_attach(c
->name
, c
->config_path
, lxc_attach_run_command
, &command
, options
, &pid
);
2741 return lxc_wait_for_pid_status(pid
);
2744 static int get_next_index(const char *lxcpath
, char *cname
)
2750 fname
= alloca(strlen(lxcpath
) + 20);
2752 sprintf(fname
, "%s/snap%d", lxcpath
, i
);
2753 ret
= stat(fname
, &sb
);
2760 static int lxcapi_snapshot(struct lxc_container
*c
, const char *commentfile
)
2763 struct lxc_container
*c2
;
2764 char snappath
[MAXPATHLEN
], newname
[20];
2766 // /var/lib/lxc -> /var/lib/lxcsnaps \0
2767 ret
= snprintf(snappath
, MAXPATHLEN
, "%ssnaps/%s", c
->config_path
, c
->name
);
2768 if (ret
< 0 || ret
>= MAXPATHLEN
)
2770 i
= get_next_index(snappath
, c
->name
);
2772 if (mkdir_p(snappath
, 0755) < 0) {
2773 ERROR("Failed to create snapshot directory %s", snappath
);
2777 ret
= snprintf(newname
, 20, "snap%d", i
);
2778 if (ret
< 0 || ret
>= 20)
2782 * We pass LXC_CLONE_SNAPSHOT to make sure that a rdepends file entry is
2783 * created in the original container
2785 flags
= LXC_CLONE_SNAPSHOT
| LXC_CLONE_KEEPMACADDR
| LXC_CLONE_KEEPNAME
|
2786 LXC_CLONE_KEEPBDEVTYPE
| LXC_CLONE_MAYBE_SNAPSHOT
;
2787 c2
= c
->clone(c
, newname
, snappath
, flags
, NULL
, NULL
, 0, NULL
);
2789 ERROR("clone of %s:%s failed\n", c
->config_path
, c
->name
);
2793 lxc_container_put(c2
);
2795 // Now write down the creation time
2802 tm_info
= localtime(&timer
);
2804 strftime(buffer
, 25, "%Y:%m:%d %H:%M:%S", tm_info
);
2806 char *dfnam
= alloca(strlen(snappath
) + strlen(newname
) + 5);
2807 sprintf(dfnam
, "%s/%s/ts", snappath
, newname
);
2808 f
= fopen(dfnam
, "w");
2810 ERROR("Failed to open %s\n", dfnam
);
2813 if (fprintf(f
, "%s", buffer
) < 0) {
2814 SYSERROR("Writing timestamp");
2820 SYSERROR("Writing timestamp");
2825 // $p / $name / comment \0
2826 int len
= strlen(snappath
) + strlen(newname
) + 10;
2827 char *path
= alloca(len
);
2828 sprintf(path
, "%s/%s/comment", snappath
, newname
);
2829 return copy_file(commentfile
, path
) < 0 ? -1 : i
;
2835 static void lxcsnap_free(struct lxc_snapshot
*s
)
2839 if (s
->comment_pathname
)
2840 free(s
->comment_pathname
);
2847 static char *get_snapcomment_path(char* snappath
, char *name
)
2849 // $snappath/$name/comment
2850 int ret
, len
= strlen(snappath
) + strlen(name
) + 10;
2851 char *s
= malloc(len
);
2854 ret
= snprintf(s
, len
, "%s/%s/comment", snappath
, name
);
2855 if (ret
< 0 || ret
>= len
) {
2863 static char *get_timestamp(char* snappath
, char *name
)
2865 char path
[MAXPATHLEN
], *s
= NULL
;
2869 ret
= snprintf(path
, MAXPATHLEN
, "%s/%s/ts", snappath
, name
);
2870 if (ret
< 0 || ret
>= MAXPATHLEN
)
2872 fin
= fopen(path
, "r");
2875 (void) fseek(fin
, 0, SEEK_END
);
2877 (void) fseek(fin
, 0, SEEK_SET
);
2882 if (fread(s
, 1, len
, fin
) != len
) {
2883 SYSERROR("reading timestamp");
2893 static int lxcapi_snapshot_list(struct lxc_container
*c
, struct lxc_snapshot
**ret_snaps
)
2895 char snappath
[MAXPATHLEN
], path2
[MAXPATHLEN
];
2896 int dirlen
, count
= 0, ret
;
2897 struct dirent dirent
, *direntp
;
2898 struct lxc_snapshot
*snaps
=NULL
, *nsnaps
;
2901 if (!c
|| !lxcapi_is_defined(c
))
2904 // snappath is ${lxcpath}snaps/${lxcname}/
2905 dirlen
= snprintf(snappath
, MAXPATHLEN
, "%ssnaps/%s", c
->config_path
, c
->name
);
2906 if (dirlen
< 0 || dirlen
>= MAXPATHLEN
) {
2907 ERROR("path name too long");
2910 dir
= opendir(snappath
);
2912 INFO("failed to open %s - assuming no snapshots", snappath
);
2916 while (!readdir_r(dir
, &dirent
, &direntp
)) {
2920 if (!strcmp(direntp
->d_name
, "."))
2923 if (!strcmp(direntp
->d_name
, ".."))
2926 ret
= snprintf(path2
, MAXPATHLEN
, "%s/%s/config", snappath
, direntp
->d_name
);
2927 if (ret
< 0 || ret
>= MAXPATHLEN
) {
2928 ERROR("pathname too long");
2931 if (!file_exists(path2
))
2933 nsnaps
= realloc(snaps
, (count
+ 1)*sizeof(*snaps
));
2935 SYSERROR("Out of memory");
2939 snaps
[count
].free
= lxcsnap_free
;
2940 snaps
[count
].name
= strdup(direntp
->d_name
);
2941 if (!snaps
[count
].name
)
2943 snaps
[count
].lxcpath
= strdup(snappath
);
2944 if (!snaps
[count
].lxcpath
) {
2945 free(snaps
[count
].name
);
2948 snaps
[count
].comment_pathname
= get_snapcomment_path(snappath
, direntp
->d_name
);
2949 snaps
[count
].timestamp
= get_timestamp(snappath
, direntp
->d_name
);
2954 WARN("failed to close directory");
2962 for (i
=0; i
<count
; i
++)
2963 lxcsnap_free(&snaps
[i
]);
2967 WARN("failed to close directory");
2971 static bool lxcapi_snapshot_restore(struct lxc_container
*c
, const char *snapname
, const char *newname
)
2973 char clonelxcpath
[MAXPATHLEN
];
2975 struct lxc_container
*snap
, *rest
;
2979 if (!c
|| !c
->name
|| !c
->config_path
)
2982 bdev
= bdev_init(c
->lxc_conf
->rootfs
.path
, c
->lxc_conf
->rootfs
.mount
, NULL
);
2984 ERROR("Failed to find original backing store type");
2990 if (strcmp(c
->name
, newname
) == 0) {
2991 if (!lxcapi_destroy(c
)) {
2992 ERROR("Could not destroy existing container %s", newname
);
2997 ret
= snprintf(clonelxcpath
, MAXPATHLEN
, "%ssnaps/%s", c
->config_path
, c
->name
);
2998 if (ret
< 0 || ret
>= MAXPATHLEN
) {
3002 // how should we lock this?
3004 snap
= lxc_container_new(snapname
, clonelxcpath
);
3005 if (!snap
|| !lxcapi_is_defined(snap
)) {
3006 ERROR("Could not open snapshot %s", snapname
);
3007 if (snap
) lxc_container_put(snap
);
3012 rest
= lxcapi_clone(snap
, newname
, c
->config_path
, 0, bdev
->type
, NULL
, 0, NULL
);
3014 if (rest
&& lxcapi_is_defined(rest
))
3017 lxc_container_put(rest
);
3018 lxc_container_put(snap
);
3022 static bool lxcapi_snapshot_destroy(struct lxc_container
*c
, const char *snapname
)
3025 char clonelxcpath
[MAXPATHLEN
];
3026 struct lxc_container
*snap
= NULL
;
3028 if (!c
|| !c
->name
|| !c
->config_path
)
3031 ret
= snprintf(clonelxcpath
, MAXPATHLEN
, "%ssnaps/%s", c
->config_path
, c
->name
);
3032 if (ret
< 0 || ret
>= MAXPATHLEN
)
3035 snap
= lxc_container_new(snapname
, clonelxcpath
);
3036 if (!snap
|| !lxcapi_is_defined(snap
)) {
3037 ERROR("Could not find snapshot %s", snapname
);
3041 if (!lxcapi_destroy(snap
)) {
3042 ERROR("Could not destroy snapshot %s", snapname
);
3045 lxc_container_put(snap
);
3050 lxc_container_put(snap
);
3054 static bool lxcapi_may_control(struct lxc_container
*c
)
3056 return lxc_try_cmd(c
->name
, c
->config_path
) == 0;
3059 static bool add_remove_device_node(struct lxc_container
*c
, const char *src_path
, const char *dest_path
, bool add
)
3063 char path
[MAXPATHLEN
];
3064 char value
[MAX_BUFFER
];
3065 char *directory_path
= NULL
;
3068 /* make sure container is running */
3069 if (!c
->is_running(c
)) {
3070 ERROR("container is not running");
3074 /* use src_path if dest_path is NULL otherwise use dest_path */
3075 p
= dest_path
? dest_path
: src_path
;
3077 /* prepare the path */
3078 ret
= snprintf(path
, MAXPATHLEN
, "/proc/%d/root/%s", c
->init_pid(c
), p
);
3079 if (ret
< 0 || ret
>= MAXPATHLEN
)
3081 remove_trailing_slashes(path
);
3083 p
= add
? src_path
: path
;
3084 /* make sure we can access p */
3085 if(access(p
, F_OK
) < 0 || stat(p
, &st
) < 0)
3088 /* continue if path is character device or block device */
3089 if (S_ISCHR(st
.st_mode
))
3090 ret
= snprintf(value
, MAX_BUFFER
, "c %d:%d rwm", major(st
.st_rdev
), minor(st
.st_rdev
));
3091 else if (S_ISBLK(st
.st_mode
))
3092 ret
= snprintf(value
, MAX_BUFFER
, "b %d:%d rwm", major(st
.st_rdev
), minor(st
.st_rdev
));
3096 /* check snprintf return code */
3097 if (ret
< 0 || ret
>= MAX_BUFFER
)
3100 directory_path
= dirname(strdup(path
));
3101 /* remove path and directory_path (if empty) */
3102 if(access(path
, F_OK
) == 0) {
3103 if (unlink(path
) < 0) {
3104 ERROR("unlink failed");
3107 if (rmdir(directory_path
) < 0 && errno
!= ENOTEMPTY
) {
3108 ERROR("rmdir failed");
3114 /* create the missing directories */
3115 if (mkdir_p(directory_path
, 0755) < 0) {
3116 ERROR("failed to create directory");
3120 /* create the device node */
3121 if (mknod(path
, st
.st_mode
, st
.st_rdev
) < 0) {
3122 ERROR("mknod failed");
3126 /* add device node to device list */
3127 if (!c
->set_cgroup_item(c
, "devices.allow", value
)) {
3128 ERROR("set_cgroup_item failed while adding the device node");
3132 /* remove device node from device list */
3133 if (!c
->set_cgroup_item(c
, "devices.deny", value
)) {
3134 ERROR("set_cgroup_item failed while removing the device node");
3141 free(directory_path
);
3145 static bool lxcapi_add_device_node(struct lxc_container
*c
, const char *src_path
, const char *dest_path
)
3148 ERROR(NOT_SUPPORTED_ERROR
, __FUNCTION__
);
3151 return add_remove_device_node(c
, src_path
, dest_path
, true);
3154 static bool lxcapi_remove_device_node(struct lxc_container
*c
, const char *src_path
, const char *dest_path
)
3157 ERROR(NOT_SUPPORTED_ERROR
, __FUNCTION__
);
3160 return add_remove_device_node(c
, src_path
, dest_path
, false);
3163 static int lxcapi_attach_run_waitl(struct lxc_container
*c
, lxc_attach_options_t
*options
, const char *program
, const char *arg
, ...)
3173 argv
= lxc_va_arg_list_to_argv_const(ap
, 1);
3177 ERROR("Memory allocation error.");
3182 ret
= lxcapi_attach_run_wait(c
, options
, program
, (const char * const *)argv
);
3187 struct lxc_container
*lxc_container_new(const char *name
, const char *configpath
)
3189 struct lxc_container
*c
;
3191 c
= malloc(sizeof(*c
));
3193 fprintf(stderr
, "failed to malloc lxc_container\n");
3196 memset(c
, 0, sizeof(*c
));
3199 c
->config_path
= strdup(configpath
);
3201 c
->config_path
= strdup(lxc_global_config_value("lxc.lxcpath"));
3203 if (!c
->config_path
) {
3204 fprintf(stderr
, "Out of memory");
3208 remove_trailing_slashes(c
->config_path
);
3209 c
->name
= malloc(strlen(name
)+1);
3211 fprintf(stderr
, "Error allocating lxc_container name\n");
3214 strcpy(c
->name
, name
);
3217 if (!(c
->slock
= lxc_newlock(c
->config_path
, name
))) {
3218 fprintf(stderr
, "failed to create lock\n");
3222 if (!(c
->privlock
= lxc_newlock(NULL
, NULL
))) {
3223 fprintf(stderr
, "failed to alloc privlock\n");
3227 if (!set_config_filename(c
)) {
3228 fprintf(stderr
, "Error allocating config file pathname\n");
3232 if (file_exists(c
->configfile
) && !lxcapi_load_config(c
, NULL
))
3235 if (ongoing_create(c
) == 2) {
3236 ERROR("Error: %s creation was not completed", c
->name
);
3238 lxcapi_clear_config(c
);
3240 c
->daemonize
= true;
3243 // assign the member functions
3244 c
->is_defined
= lxcapi_is_defined
;
3245 c
->state
= lxcapi_state
;
3246 c
->is_running
= lxcapi_is_running
;
3247 c
->freeze
= lxcapi_freeze
;
3248 c
->unfreeze
= lxcapi_unfreeze
;
3249 c
->console
= lxcapi_console
;
3250 c
->console_getfd
= lxcapi_console_getfd
;
3251 c
->init_pid
= lxcapi_init_pid
;
3252 c
->load_config
= lxcapi_load_config
;
3253 c
->want_daemonize
= lxcapi_want_daemonize
;
3254 c
->want_close_all_fds
= lxcapi_want_close_all_fds
;
3255 c
->start
= lxcapi_start
;
3256 c
->startl
= lxcapi_startl
;
3257 c
->stop
= lxcapi_stop
;
3258 c
->config_file_name
= lxcapi_config_file_name
;
3259 c
->wait
= lxcapi_wait
;
3260 c
->set_config_item
= lxcapi_set_config_item
;
3261 c
->destroy
= lxcapi_destroy
;
3262 c
->rename
= lxcapi_rename
;
3263 c
->save_config
= lxcapi_save_config
;
3264 c
->get_keys
= lxcapi_get_keys
;
3265 c
->create
= lxcapi_create
;
3266 c
->createl
= lxcapi_createl
;
3267 c
->shutdown
= lxcapi_shutdown
;
3268 c
->reboot
= lxcapi_reboot
;
3269 c
->clear_config
= lxcapi_clear_config
;
3270 c
->clear_config_item
= lxcapi_clear_config_item
;
3271 c
->get_config_item
= lxcapi_get_config_item
;
3272 c
->get_running_config_item
= lxcapi_get_running_config_item
;
3273 c
->get_cgroup_item
= lxcapi_get_cgroup_item
;
3274 c
->set_cgroup_item
= lxcapi_set_cgroup_item
;
3275 c
->get_config_path
= lxcapi_get_config_path
;
3276 c
->set_config_path
= lxcapi_set_config_path
;
3277 c
->clone
= lxcapi_clone
;
3278 c
->get_interfaces
= lxcapi_get_interfaces
;
3279 c
->get_ips
= lxcapi_get_ips
;
3280 c
->attach
= lxcapi_attach
;
3281 c
->attach_run_wait
= lxcapi_attach_run_wait
;
3282 c
->attach_run_waitl
= lxcapi_attach_run_waitl
;
3283 c
->snapshot
= lxcapi_snapshot
;
3284 c
->snapshot_list
= lxcapi_snapshot_list
;
3285 c
->snapshot_restore
= lxcapi_snapshot_restore
;
3286 c
->snapshot_destroy
= lxcapi_snapshot_destroy
;
3287 c
->may_control
= lxcapi_may_control
;
3288 c
->add_device_node
= lxcapi_add_device_node
;
3289 c
->remove_device_node
= lxcapi_remove_device_node
;
3291 /* we'll allow the caller to update these later */
3292 if (lxc_log_init(NULL
, "none", NULL
, "lxc_container", 0, c
->config_path
)) {
3293 fprintf(stderr
, "failed to open log\n");
3300 lxc_container_free(c
);
3304 int lxc_get_wait_states(const char **states
)
3309 for (i
=0; i
<MAX_STATE
; i
++)
3310 states
[i
] = lxc_state2str(i
);
3315 * These next two could probably be done smarter with reusing a common function
3316 * with different iterators and tests...
3318 int list_defined_containers(const char *lxcpath
, char ***names
, struct lxc_container
***cret
)
3321 int i
, cfound
= 0, nfound
= 0;
3322 struct dirent dirent
, *direntp
;
3323 struct lxc_container
*c
;
3326 lxcpath
= lxc_global_config_value("lxc.lxcpath");
3328 dir
= opendir(lxcpath
);
3330 SYSERROR("opendir on lxcpath");
3339 while (!readdir_r(dir
, &dirent
, &direntp
)) {
3342 if (!strcmp(direntp
->d_name
, "."))
3344 if (!strcmp(direntp
->d_name
, ".."))
3347 if (!config_file_exists(lxcpath
, direntp
->d_name
))
3351 if (!add_to_array(names
, direntp
->d_name
, cfound
))
3361 c
= lxc_container_new(direntp
->d_name
, lxcpath
);
3363 INFO("Container %s:%s has a config but could not be loaded",
3364 lxcpath
, direntp
->d_name
);
3366 if(!remove_from_array(names
, direntp
->d_name
, cfound
--))
3370 if (!lxcapi_is_defined(c
)) {
3371 INFO("Container %s:%s has a config but is not defined",
3372 lxcpath
, direntp
->d_name
);
3374 if(!remove_from_array(names
, direntp
->d_name
, cfound
--))
3376 lxc_container_put(c
);
3380 if (!add_to_clist(cret
, c
, nfound
, true)) {
3381 lxc_container_put(c
);
3391 if (names
&& *names
) {
3392 for (i
=0; i
<cfound
; i
++)
3396 if (cret
&& *cret
) {
3397 for (i
=0; i
<nfound
; i
++)
3398 lxc_container_put((*cret
)[i
]);
3405 int list_active_containers(const char *lxcpath
, char ***nret
,
3406 struct lxc_container
***cret
)
3408 int i
, ret
= -1, cret_cnt
= 0, ct_name_cnt
= 0;
3411 char **ct_name
= NULL
;
3413 struct lxc_container
*c
;
3416 lxcpath
= lxc_global_config_value("lxc.lxcpath");
3417 lxcpath_len
= strlen(lxcpath
);
3424 FILE *f
= fopen("/proc/net/unix", "r");
3428 while (getline(&line
, &len
, f
) != -1) {
3429 char *p
= strrchr(line
, ' '), *p2
;
3436 if (strncmp(p
, lxcpath
, lxcpath_len
) != 0)
3442 // Now p is the start of lxc_name
3444 if (!p2
|| strncmp(p2
, "/command", 8) != 0)
3448 if (array_contains(&ct_name
, p
, ct_name_cnt
))
3451 if (!add_to_array(&ct_name
, p
, ct_name_cnt
))
3452 goto free_cret_list
;
3459 c
= lxc_container_new(p
, lxcpath
);
3461 INFO("Container %s:%s is running but could not be loaded",
3463 remove_from_array(&ct_name
, p
, ct_name_cnt
--);
3468 * If this is an anonymous container, then is_defined *can*
3469 * return false. So we don't do that check. Count on the
3470 * fact that the command socket exists.
3473 if (!add_to_clist(cret
, c
, cret_cnt
, true)) {
3474 lxc_container_put(c
);
3475 goto free_cret_list
;
3480 assert(!nret
|| !cret
|| cret_cnt
== ct_name_cnt
);
3489 if (cret
&& *cret
) {
3490 for (i
= 0; i
< cret_cnt
; i
++)
3491 lxc_container_put((*cret
)[i
]);
3497 for (i
= 0; i
< ct_name_cnt
; i
++)
3510 int list_all_containers(const char *lxcpath
, char ***nret
,
3511 struct lxc_container
***cret
)
3513 int i
, ret
, active_cnt
, ct_cnt
, ct_list_cnt
;
3516 struct lxc_container
**ct_list
= NULL
;
3518 ct_cnt
= list_defined_containers(lxcpath
, &ct_name
, NULL
);
3522 active_cnt
= list_active_containers(lxcpath
, &active_name
, NULL
);
3523 if (active_cnt
< 0) {
3528 for (i
= 0; i
< active_cnt
; i
++) {
3529 if (!array_contains(&ct_name
, active_name
[i
], ct_cnt
)) {
3530 if (!add_to_array(&ct_name
, active_name
[i
], ct_cnt
)) {
3532 goto free_active_name
;
3536 free(active_name
[i
]);
3537 active_name
[i
] = NULL
;
3543 for (i
= 0, ct_list_cnt
= 0; i
< ct_cnt
&& cret
; i
++) {
3544 struct lxc_container
*c
;
3546 c
= lxc_container_new(ct_name
[i
], lxcpath
);
3548 WARN("Container %s:%s could not be loaded", lxcpath
, ct_name
[i
]);
3549 remove_from_array(&ct_name
, ct_name
[i
], ct_cnt
--);
3553 if (!add_to_clist(&ct_list
, c
, ct_list_cnt
, false)) {
3554 lxc_container_put(c
);
3573 for (i
= 0; i
< ct_list_cnt
; i
++) {
3574 lxc_container_put(ct_list
[i
]);
3580 for (i
= 0; i
< active_cnt
; i
++) {
3582 free(active_name
[i
]);
3588 for (i
= 0; i
< ct_cnt
; i
++) {