3 * Copyright © 2012 Serge Hallyn <serge.hallyn@ubuntu.com>.
4 * Copyright © 2012 Canonical Ltd.
6 * This library is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
9 * version 2.1 of the License, or (at your option) any later version.
11 * This library is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Lesser General Public License for more details.
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with this library; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
26 #include <sys/types.h>
28 #include <sys/mount.h>
34 #include <arpa/inet.h>
38 #include <lxc/lxccontainer.h>
39 #include <lxc/version.h>
54 #include "namespace.h"
60 #include <../include/ifaddrs.h>
63 #define MAX_BUFFER 4096
65 #define NOT_SUPPORTED_ERROR "the requested function %s is not currently supported with unprivileged containers"
67 lxc_log_define(lxc_container
, lxc
);
69 static bool file_exists(const char *f
)
73 return stat(f
, &statbuf
) == 0;
76 static bool config_file_exists(const char *lxcpath
, const char *cname
)
78 /* $lxcpath + '/' + $cname + '/config' + \0 */
79 int ret
, len
= strlen(lxcpath
) + strlen(cname
) + 9;
80 char *fname
= alloca(len
);
82 ret
= snprintf(fname
, len
, "%s/%s/config", lxcpath
, cname
);
83 if (ret
< 0 || ret
>= len
)
86 return file_exists(fname
);
90 * A few functions to help detect when a container creation failed.
91 * If a container creation was killed partway through, then trying
92 * to actually start that container could harm the host. We detect
93 * this by creating a 'partial' file under the container directory,
94 * and keeping an advisory lock. When container creation completes,
95 * we remove that file. When we load or try to start a container, if
96 * we find that file, without a flock, we remove the container.
98 static int ongoing_create(struct lxc_container
*c
)
100 int len
= strlen(c
->config_path
) + strlen(c
->name
) + 10;
101 char *path
= alloca(len
);
105 ret
= snprintf(path
, len
, "%s/%s/partial", c
->config_path
, c
->name
);
106 if (ret
< 0 || ret
>= len
) {
107 ERROR("Error writing partial pathname");
111 if (!file_exists(path
))
113 fd
= open(path
, O_RDWR
);
115 // give benefit of the doubt
116 SYSERROR("Error opening partial file");
120 lk
.l_whence
= SEEK_SET
;
124 if (fcntl(fd
, F_GETLK
, &lk
) == 0 && lk
.l_pid
!= -1) {
125 // create is still ongoing
129 // create completed but partial is still there.
134 static int create_partial(struct lxc_container
*c
)
136 // $lxcpath + '/' + $name + '/partial' + \0
137 int len
= strlen(c
->config_path
) + strlen(c
->name
) + 10;
138 char *path
= alloca(len
);
142 ret
= snprintf(path
, len
, "%s/%s/partial", c
->config_path
, c
->name
);
143 if (ret
< 0 || ret
>= len
) {
144 ERROR("Error writing partial pathname");
147 if ((fd
=open(path
, O_RDWR
| O_CREAT
| O_EXCL
, 0755)) < 0) {
148 SYSERROR("Erorr creating partial file");
152 lk
.l_whence
= SEEK_SET
;
155 if (fcntl(fd
, F_SETLKW
, &lk
) < 0) {
156 SYSERROR("Error locking partial file %s", path
);
164 static void remove_partial(struct lxc_container
*c
, int fd
)
166 // $lxcpath + '/' + $name + '/partial' + \0
167 int len
= strlen(c
->config_path
) + strlen(c
->name
) + 10;
168 char *path
= alloca(len
);
172 ret
= snprintf(path
, len
, "%s/%s/partial", c
->config_path
, c
->name
);
173 if (ret
< 0 || ret
>= len
) {
174 ERROR("Error writing partial pathname");
177 if (unlink(path
) < 0)
178 SYSERROR("Error unlink partial file %s", path
);
182 * 1. container_mem_lock(c) protects the struct lxc_container from multiple threads.
183 * 2. container_disk_lock(c) protects the on-disk container data - in particular the
184 * container configuration file.
185 * The container_disk_lock also takes the container_mem_lock.
186 * 3. thread_mutex protects process data (ex: fd table) from multiple threads.
187 * NOTHING mutexes two independent programs with their own struct
188 * lxc_container for the same c->name, between API calls. For instance,
189 * c->config_read(); c->start(); Between those calls, data on disk
190 * could change (which shouldn't bother the caller unless for instance
191 * the rootfs get moved). c->config_read(); update; c->config_write();
192 * Two such updaters could race. The callers should therefore check their
193 * results. Trying to prevent that would necessarily expose us to deadlocks
194 * due to hung callers. So I prefer to keep the locks only within our own
195 * functions, not across functions.
197 * If you're going to clone while holding a lxccontainer, increment
198 * c->numthreads (under privlock) before forking. When deleting,
199 * decrement numthreads under privlock, then if it hits 0 you can delete.
200 * Do not ever use a lxccontainer whose numthreads you did not bump.
203 static void lxc_container_free(struct lxc_container
*c
)
210 c
->configfile
= NULL
;
212 if (c
->error_string
) {
213 free(c
->error_string
);
214 c
->error_string
= NULL
;
217 lxc_putlock(c
->slock
);
221 lxc_putlock(c
->privlock
);
229 lxc_conf_free(c
->lxc_conf
);
232 if (c
->config_path
) {
233 free(c
->config_path
);
234 c
->config_path
= NULL
;
241 * Consider the following case:
242 freer | racing get()er
243 ==================================================================
244 lxc_container_put() | lxc_container_get()
245 \ lxclock(c->privlock) | c->numthreads < 1? (no)
246 \ c->numthreads = 0 | \ lxclock(c->privlock) -> waits
248 \ lxc_container_free() | \ lxclock() returns
249 | \ c->numthreads < 1 -> return 0
251 \ \ sem_destroy(privlock) |
253 * When the get()er checks numthreads the first time, one of the following
255 * 1. freer has set numthreads = 0. get() returns 0
256 * 2. freer is between lxclock and setting numthreads to 0. get()er will
257 * sem_wait on privlock, get lxclock after freer() drops it, then see
258 * numthreads is 0 and exit without touching lxclock again..
259 * 3. freer has not yet locked privlock. If get()er runs first, then put()er
260 * will see --numthreads = 1 and not call lxc_container_free().
263 int lxc_container_get(struct lxc_container
*c
)
268 // if someone else has already started freeing the container, don't
269 // try to take the lock, which may be invalid
270 if (c
->numthreads
< 1)
273 if (container_mem_lock(c
))
275 if (c
->numthreads
< 1) {
276 // bail without trying to unlock, bc the privlock is now probably
281 container_mem_unlock(c
);
285 int lxc_container_put(struct lxc_container
*c
)
289 if (container_mem_lock(c
))
291 if (--c
->numthreads
< 1) {
292 container_mem_unlock(c
);
293 lxc_container_free(c
);
296 container_mem_unlock(c
);
300 static bool lxcapi_is_defined(struct lxc_container
*c
)
309 if (container_mem_lock(c
))
313 statret
= stat(c
->configfile
, &statbuf
);
319 container_mem_unlock(c
);
323 static const char *lxcapi_state(struct lxc_container
*c
)
329 s
= lxc_getstate(c
->name
, c
->config_path
);
330 return lxc_state2str(s
);
333 static bool is_stopped(struct lxc_container
*c
)
336 s
= lxc_getstate(c
->name
, c
->config_path
);
337 return (s
== STOPPED
);
340 static bool lxcapi_is_running(struct lxc_container
*c
)
347 if (!s
|| strcmp(s
, "STOPPED") == 0)
352 static bool lxcapi_freeze(struct lxc_container
*c
)
358 ret
= lxc_freeze(c
->name
, c
->config_path
);
364 static bool lxcapi_unfreeze(struct lxc_container
*c
)
370 ret
= lxc_unfreeze(c
->name
, c
->config_path
);
376 static int lxcapi_console_getfd(struct lxc_container
*c
, int *ttynum
, int *masterfd
)
382 ttyfd
= lxc_console_getfd(c
, ttynum
, masterfd
);
386 static int lxcapi_console(struct lxc_container
*c
, int ttynum
, int stdinfd
,
387 int stdoutfd
, int stderrfd
, int escape
)
389 return lxc_console(c
, ttynum
, stdinfd
, stdoutfd
, stderrfd
, escape
);
392 static pid_t
lxcapi_init_pid(struct lxc_container
*c
)
397 return lxc_cmd_get_init_pid(c
->name
, c
->config_path
);
400 static bool load_config_locked(struct lxc_container
*c
, const char *fname
)
403 c
->lxc_conf
= lxc_conf_init();
404 if (c
->lxc_conf
&& !lxc_config_read(fname
, c
->lxc_conf
))
409 static bool lxcapi_load_config(struct lxc_container
*c
, const char *alt_file
)
411 bool ret
= false, need_disklock
= false;
417 fname
= c
->configfile
;
423 * If we're reading something other than the container's config,
424 * we only need to lock the in-memory container. If loading the
425 * container's config file, take the disk lock.
427 if (strcmp(fname
, c
->configfile
) == 0)
428 need_disklock
= true;
431 lret
= container_disk_lock(c
);
433 lret
= container_mem_lock(c
);
437 ret
= load_config_locked(c
, fname
);
440 container_disk_unlock(c
);
442 container_mem_unlock(c
);
446 static bool lxcapi_want_daemonize(struct lxc_container
*c
, bool state
)
448 if (!c
|| !c
->lxc_conf
)
450 if (container_mem_lock(c
)) {
451 ERROR("Error getting mem lock");
454 c
->daemonize
= state
;
455 /* daemonize implies close_all_fds so set it */
457 c
->lxc_conf
->close_all_fds
= 1;
458 container_mem_unlock(c
);
462 static bool lxcapi_want_close_all_fds(struct lxc_container
*c
, bool state
)
464 if (!c
|| !c
->lxc_conf
)
466 if (container_mem_lock(c
)) {
467 ERROR("Error getting mem lock");
470 c
->lxc_conf
->close_all_fds
= state
;
471 container_mem_unlock(c
);
475 static bool lxcapi_wait(struct lxc_container
*c
, const char *state
, int timeout
)
482 ret
= lxc_wait(c
->name
, state
, timeout
, c
->config_path
);
487 static bool wait_on_daemonized_start(struct lxc_container
*c
, int pid
)
489 /* we'll probably want to make this timeout configurable? */
490 int timeout
= 5, ret
, status
;
493 * our child is going to fork again, then exit. reap the
496 ret
= waitpid(pid
, &status
, 0);
497 if (ret
== -1 || !WIFEXITED(status
) || WEXITSTATUS(status
) != 0)
498 DEBUG("failed waiting for first dual-fork child");
499 return lxcapi_wait(c
, "RUNNING", timeout
);
502 static bool am_single_threaded(void)
504 struct dirent dirent
, *direntp
;
508 dir
= opendir("/proc/self/task");
510 INFO("failed to open /proc/self/task");
514 while (!readdir_r(dir
, &dirent
, &direntp
)) {
518 if (!strcmp(direntp
->d_name
, "."))
521 if (!strcmp(direntp
->d_name
, ".."))
531 * I can't decide if it'd be more convenient for callers if we accept '...',
532 * or a null-terminated array (i.e. execl vs execv)
534 static bool lxcapi_start(struct lxc_container
*c
, int useinit
, char * const argv
[])
537 struct lxc_conf
*conf
;
538 bool daemonize
= false;
540 char *default_args
[] = {
545 /* container exists */
548 /* container has been setup */
552 if ((ret
= ongoing_create(c
)) < 0) {
553 ERROR("Error checking for incomplete creation");
557 ERROR("Error: %s creation was not completed", c
->name
);
560 } else if (ret
== 1) {
561 ERROR("Error: creation of %s is ongoing", c
->name
);
565 /* is this app meant to be run through lxcinit, as in lxc-execute? */
566 if (useinit
&& !argv
)
569 if (container_mem_lock(c
))
572 daemonize
= c
->daemonize
;
573 container_mem_unlock(c
);
576 ret
= lxc_execute(c
->name
, argv
, 1, conf
, c
->config_path
);
577 return ret
== 0 ? true : false;
584 * say, I'm not sure - what locks do we want here? Any?
585 * Is liblxc's locking enough here to protect the on disk
586 * container? We don't want to exclude things like lxc_info
587 * while container is running...
590 lxc_monitord_spawn(c
->config_path
);
597 /* Set to NULL because we don't want father unlink
598 * the PID file, child will do the free and unlink.
601 return wait_on_daemonized_start(c
, pid
);
604 /* second fork to be reparented by init */
607 SYSERROR("Error doing dual-fork");
612 /* like daemon(), chdir to / and redirect 0,1,2 to /dev/null */
614 SYSERROR("Error chdir()ing to /.");
620 open("/dev/zero", O_RDONLY
);
621 open("/dev/null", O_RDWR
);
622 open("/dev/null", O_RDWR
);
625 if (!am_single_threaded()) {
626 ERROR("Cannot start non-daemonized container when threaded");
631 /* We need to write PID file after daeminize, so we always
632 * write the right PID.
635 pid_fp
= fopen(c
->pidfile
, "w");
636 if (pid_fp
== NULL
) {
637 SYSERROR("Failed to create pidfile '%s' for '%s'",
638 c
->pidfile
, c
->name
);
642 if (fprintf(pid_fp
, "%d\n", getpid()) < 0) {
643 SYSERROR("Failed to write '%s'", c
->pidfile
);
655 ret
= lxc_start(c
->name
, argv
, conf
, c
->config_path
);
658 INFO("container requested reboot");
670 exit (ret
== 0 ? true : false);
672 return (ret
== 0 ? true : false);
676 * note there MUST be an ending NULL
678 static bool lxcapi_startl(struct lxc_container
*c
, int useinit
, ...)
681 char **inargs
= NULL
;
684 /* container exists */
688 va_start(ap
, useinit
);
689 inargs
= lxc_va_arg_list_to_argv(ap
, 0, 1);
693 ERROR("Memory allocation error.");
697 /* pass NULL if no arguments were supplied */
698 bret
= lxcapi_start(c
, useinit
, *inargs
? inargs
: NULL
);
703 for (arg
= inargs
; *arg
; arg
++)
711 static bool lxcapi_stop(struct lxc_container
*c
)
718 ret
= lxc_cmd_stop(c
->name
, c
->config_path
);
724 * create the standard expected container dir
726 static bool create_container_dir(struct lxc_container
*c
)
731 len
= strlen(c
->config_path
) + strlen(c
->name
) + 2;
735 ret
= snprintf(s
, len
, "%s/%s", c
->config_path
, c
->name
);
736 if (ret
< 0 || ret
>= len
) {
740 ret
= mkdir(s
, 0755);
745 SYSERROR("failed to create container path for %s\n", c
->name
);
751 static const char *lxcapi_get_config_path(struct lxc_container
*c
);
752 static bool lxcapi_set_config_item(struct lxc_container
*c
, const char *key
, const char *v
);
755 * do_bdev_create: thin wrapper around bdev_create(). Like bdev_create(),
756 * it returns a mounted bdev on success, NULL on error.
758 static struct bdev
*do_bdev_create(struct lxc_container
*c
, const char *type
,
759 struct bdev_specs
*specs
)
766 /* rootfs.path or lxcpath/lxcname/rootfs */
767 if (c
->lxc_conf
->rootfs
.path
&& access(c
->lxc_conf
->rootfs
.path
, F_OK
) == 0) {
768 const char *rpath
= c
->lxc_conf
->rootfs
.path
;
769 len
= strlen(rpath
) + 1;
771 ret
= snprintf(dest
, len
, "%s", rpath
);
773 const char *lxcpath
= lxcapi_get_config_path(c
);
774 len
= strlen(c
->name
) + strlen(lxcpath
) + 9;
776 ret
= snprintf(dest
, len
, "%s/%s/rootfs", lxcpath
, c
->name
);
778 if (ret
< 0 || ret
>= len
)
781 bdev
= bdev_create(dest
, type
, c
->name
, specs
);
783 ERROR("Failed to create backing store type %s\n", type
);
787 lxcapi_set_config_item(c
, "lxc.rootfs", bdev
->src
);
789 /* if we are not root, chown the rootfs dir to root in the
792 if (geteuid() != 0) {
793 if (chown_mapped_root(bdev
->dest
, c
->lxc_conf
) < 0) {
794 ERROR("Error chowning %s to container root\n", bdev
->dest
);
804 * Given the '-t' template option to lxc-create, figure out what to
805 * do. If the template is a full executable path, use that. If it
806 * is something like 'sshd', then return $templatepath/lxc-sshd.
807 * On success return the template, on error return NULL.
809 static char *get_template_path(const char *t
)
814 if (t
[0] == '/' && access(t
, X_OK
) == 0) {
819 len
= strlen(LXCTEMPLATEDIR
) + strlen(t
) + strlen("/lxc-") + 1;
823 ret
= snprintf(tpath
, len
, "%s/lxc-%s", LXCTEMPLATEDIR
, t
);
824 if (ret
< 0 || ret
>= len
) {
828 if (access(tpath
, X_OK
) < 0) {
829 SYSERROR("bad template: %s\n", t
);
837 static char *lxcbasename(char *path
)
839 char *p
= path
+ strlen(path
) - 1;
840 while (*p
!= '/' && p
> path
)
845 static bool create_run_template(struct lxc_container
*c
, char *tpath
, bool quiet
,
855 SYSERROR("failed to fork task for container creation template\n");
859 if (pid
== 0) { // child
860 char *patharg
, *namearg
, *rootfsarg
, *src
;
861 struct bdev
*bdev
= NULL
;
863 int ret
, len
, nargs
= 0;
865 struct lxc_conf
*conf
= c
->lxc_conf
;
871 open("/dev/zero", O_RDONLY
);
872 open("/dev/null", O_RDWR
);
873 open("/dev/null", O_RDWR
);
876 src
= c
->lxc_conf
->rootfs
.path
;
878 * for an overlayfs create, what the user wants is the template to fill
879 * in what will become the readonly lower layer. So don't mount for
882 if (strncmp(src
, "overlayfs:", 10) == 0) {
883 src
= overlayfs_getlower(src
+10);
885 bdev
= bdev_init(src
, c
->lxc_conf
->rootfs
.mount
, NULL
);
887 ERROR("Error opening rootfs");
891 if (geteuid() == 0) {
892 if (unshare(CLONE_NEWNS
) < 0) {
893 ERROR("error unsharing mounts");
896 if (detect_shared_rootfs()) {
897 if (mount("", "", NULL
, MS_SLAVE
|MS_REC
, 0)) {
898 SYSERROR("Failed to make / rslave to run template");
899 ERROR("Continuing...");
903 if (strcmp(bdev
->type
, "dir") != 0) {
904 if (geteuid() != 0) {
905 ERROR("non-root users can only create directory-backed containers");
908 if (bdev
->ops
->mount(bdev
) < 0) {
909 ERROR("Error mounting rootfs");
912 } else { // TODO come up with a better way here!
915 bdev
->dest
= strdup(bdev
->src
);
919 * create our new array, pre-pend the template name and
923 for (nargs
= 0; argv
[nargs
]; nargs
++) ;
924 nargs
+= 4; // template, path, rootfs and name args
926 newargv
= malloc(nargs
* sizeof(*newargv
));
929 newargv
[0] = lxcbasename(tpath
);
931 len
= strlen(c
->config_path
) + strlen(c
->name
) + strlen("--path=") + 2;
932 patharg
= malloc(len
);
935 ret
= snprintf(patharg
, len
, "--path=%s/%s", c
->config_path
, c
->name
);
936 if (ret
< 0 || ret
>= len
)
938 newargv
[1] = patharg
;
939 len
= strlen("--name=") + strlen(c
->name
) + 1;
940 namearg
= malloc(len
);
943 ret
= snprintf(namearg
, len
, "--name=%s", c
->name
);
944 if (ret
< 0 || ret
>= len
)
946 newargv
[2] = namearg
;
948 len
= strlen("--rootfs=") + 1 + strlen(bdev
->dest
);
949 rootfsarg
= malloc(len
);
952 ret
= snprintf(rootfsarg
, len
, "--rootfs=%s", bdev
->dest
);
953 if (ret
< 0 || ret
>= len
)
955 newargv
[3] = rootfsarg
;
957 /* add passed-in args */
959 for (i
= 4; i
< nargs
; i
++)
960 newargv
[i
] = argv
[i
-4];
962 /* add trailing NULL */
964 newargv
= realloc(newargv
, nargs
* sizeof(*newargv
));
967 newargv
[nargs
- 1] = NULL
;
970 * If we're running the template in a mapped userns, then
971 * we prepend the template command with:
972 * lxc-usernsexec <-m map1> ... <-m mapn> --
973 * and we append "--mapped-uid x", where x is the mapped uid
976 if (geteuid() != 0 && !lxc_list_empty(&conf
->id_map
)) {
979 char **n2
= malloc(n2args
* sizeof(*n2
));
984 SYSERROR("out of memory");
988 tpath
= "lxc-usernsexec";
989 n2
[0] = "lxc-usernsexec";
990 lxc_list_for_each(it
, &conf
->id_map
) {
993 n2
= realloc(n2
, n2args
* sizeof(char *));
997 n2
[n2args
-1] = malloc(200);
1000 ret
= snprintf(n2
[n2args
-1], 200, "%c:%lu:%lu:%lu",
1001 map
->idtype
== ID_TYPE_UID
? 'u' : 'g',
1002 map
->nsid
, map
->hostid
, map
->range
);
1003 if (ret
< 0 || ret
>= 200)
1006 int hostid_mapped
= mapped_hostid(geteuid(), conf
);
1007 int extraargs
= hostid_mapped
>= 0 ? 1 : 3;
1008 n2
= realloc(n2
, (nargs
+ n2args
+ extraargs
) * sizeof(char *));
1011 if (hostid_mapped
< 0) {
1012 hostid_mapped
= find_unmapped_nsuid(conf
);
1013 n2
[n2args
++] = "-m";
1014 if (hostid_mapped
< 0) {
1015 ERROR("Could not find free uid to map");
1018 n2
[n2args
++] = malloc(200);
1019 if (!n2
[n2args
-1]) {
1020 SYSERROR("out of memory");
1023 ret
= snprintf(n2
[n2args
-1], 200, "u:%d:%d:1",
1024 hostid_mapped
, geteuid());
1025 if (ret
< 0 || ret
>= 200) {
1026 ERROR("string too long");
1030 n2
[n2args
++] = "--";
1031 for (i
= 0; i
< nargs
; i
++)
1032 n2
[i
+ n2args
] = newargv
[i
];
1034 // Finally add "--mapped-uid $uid" to tell template what to chown
1037 n2
= realloc(n2
, n2args
* sizeof(char *));
1039 SYSERROR("out of memory");
1042 // note n2[n2args-1] is NULL
1043 n2
[n2args
-3] = "--mapped-uid";
1044 snprintf(txtuid
, 20, "%d", hostid_mapped
);
1045 n2
[n2args
-2] = txtuid
;
1046 n2
[n2args
-1] = NULL
;
1051 execvp(tpath
, newargv
);
1052 SYSERROR("failed to execute template %s", tpath
);
1056 if (wait_for_pid(pid
) != 0) {
1057 ERROR("container creation template for %s failed\n", c
->name
);
1064 static bool prepend_lxc_header(char *path
, const char *t
, char *const argv
[])
1072 unsigned char md_value
[SHA_DIGEST_LENGTH
];
1076 f
= fopen(path
, "r");
1080 if (fseek(f
, 0, SEEK_END
) < 0)
1082 if ((flen
= ftell(f
)) < 0)
1084 if (fseek(f
, 0, SEEK_SET
) < 0)
1086 if ((contents
= malloc(flen
+ 1)) == NULL
)
1088 if (fread(contents
, 1, flen
, f
) != flen
)
1089 goto out_free_contents
;
1091 contents
[flen
] = '\0';
1095 goto out_free_contents
;
1098 tpath
= get_template_path(t
);
1100 ERROR("bad template: %s\n", t
);
1101 goto out_free_contents
;
1104 ret
= sha1sum_file(tpath
, md_value
);
1106 ERROR("Error getting sha1sum of %s", tpath
);
1108 goto out_free_contents
;
1113 f
= fopen(path
, "w");
1115 SYSERROR("reopening config for writing");
1119 fprintf(f
, "# Template used to create this container: %s\n", t
);
1121 fprintf(f
, "# Parameters passed to the template:");
1123 fprintf(f
, " %s", *argv
);
1129 fprintf(f
, "# Template script checksum (SHA-1): ");
1130 for (i
=0; i
<SHA_DIGEST_LENGTH
; i
++)
1131 fprintf(f
, "%02x", md_value
[i
]);
1134 fprintf(f
, "# For additional config options, please look at lxc.conf(5)\n");
1135 if (fwrite(contents
, 1, flen
, f
) != flen
) {
1136 SYSERROR("Writing original contents");
1152 SYSERROR("Error prepending header");
1158 static void lxcapi_clear_config(struct lxc_container
*c
)
1160 if (c
&& c
->lxc_conf
) {
1161 lxc_conf_free(c
->lxc_conf
);
1166 static bool lxcapi_destroy(struct lxc_container
*c
);
1169 * create a container with the given parameters.
1170 * @c: container to be created. It has the lxcpath, name, and a starting
1171 * configuration already set
1172 * @t: the template to execute to instantiate the root filesystem and
1173 * adjust the configuration.
1174 * @bdevtype: backing store type to use. If NULL, dir will be used.
1175 * @specs: additional parameters for the backing store, i.e. LVM vg to
1178 * @argv: the arguments to pass to the template, terminated by NULL. If no
1179 * arguments, you can just pass NULL.
1181 static bool lxcapi_create(struct lxc_container
*c
, const char *t
,
1182 const char *bdevtype
, struct bdev_specs
*specs
, int flags
,
1194 tpath
= get_template_path(t
);
1196 ERROR("bad template: %s\n", t
);
1202 * If a template is passed in, and the rootfs already is defined in
1203 * the container config and exists, then * caller is trying to create
1204 * an existing container. Return an error, but do NOT delete the
1207 if (lxcapi_is_defined(c
) && c
->lxc_conf
&& c
->lxc_conf
->rootfs
.path
&&
1208 access(c
->lxc_conf
->rootfs
.path
, F_OK
) == 0 && tpath
) {
1209 ERROR("Container %s:%s already exists", c
->config_path
, c
->name
);
1214 if (!c
->load_config(c
, lxc_global_config_value("lxc.default_config"))) {
1215 ERROR("Error loading default configuration file %s\n", lxc_global_config_value("lxc.default_config"));
1220 if (!create_container_dir(c
))
1224 * either template or rootfs.path should be set.
1225 * if both template and rootfs.path are set, template is setup as rootfs.path.
1226 * container is already created if we have a config and rootfs.path is accessible
1228 if (!c
->lxc_conf
->rootfs
.path
&& !tpath
)
1229 /* no template passed in and rootfs does not exist: error */
1231 if (c
->lxc_conf
->rootfs
.path
&& access(c
->lxc_conf
->rootfs
.path
, F_OK
) != 0)
1232 /* rootfs passed into configuration, but does not exist: error */
1234 if (lxcapi_is_defined(c
) && c
->lxc_conf
->rootfs
.path
&& !tpath
) {
1235 /* Rootfs already existed, user just wanted to save the
1236 * loaded configuration */
1241 /* Mark that this container is being created */
1242 if ((partial_fd
= create_partial(c
)) < 0)
1245 /* no need to get disk lock bc we have the partial locked */
1248 * Create the backing store
1249 * Note we can't do this in the same task as we use to execute the
1250 * template because of the way zfs works.
1251 * After you 'zfs create', zfs mounts the fs only in the initial
1256 SYSERROR("failed to fork task for container creation template\n");
1260 if (pid
== 0) { // child
1261 struct bdev
*bdev
= NULL
;
1263 if (!(bdev
= do_bdev_create(c
, bdevtype
, specs
))) {
1264 ERROR("Error creating backing store type %s for %s",
1265 bdevtype
? bdevtype
: "(none)", c
->name
);
1269 /* save config file again to store the new rootfs location */
1270 if (!c
->save_config(c
, NULL
)) {
1271 ERROR("failed to save starting configuration for %s\n", c
->name
);
1272 // parent task won't see bdev in config so we delete it
1273 bdev
->ops
->umount(bdev
);
1274 bdev
->ops
->destroy(bdev
);
1279 if (wait_for_pid(pid
) != 0)
1282 /* reload config to get the rootfs */
1283 lxc_conf_free(c
->lxc_conf
);
1285 if (!load_config_locked(c
, c
->configfile
))
1288 if (!create_run_template(c
, tpath
, !!(flags
& LXC_CREATE_QUIET
), argv
))
1291 // now clear out the lxc_conf we have, reload from the created
1293 lxcapi_clear_config(c
);
1296 if (!prepend_lxc_header(c
->configfile
, tpath
, argv
)) {
1297 ERROR("Error prepending header to configuration file");
1301 ret
= load_config_locked(c
, c
->configfile
);
1304 if (partial_fd
>= 0)
1305 remove_partial(c
, partial_fd
);
1315 static bool lxcapi_reboot(struct lxc_container
*c
)
1321 if (!c
->is_running(c
))
1323 pid
= c
->init_pid(c
);
1326 if (kill(pid
, SIGINT
) < 0)
1332 static bool lxcapi_shutdown(struct lxc_container
*c
, int timeout
)
1336 int haltsignal
= SIGPWR
;
1343 if (!c
->is_running(c
))
1345 pid
= c
->init_pid(c
);
1348 if (c
->lxc_conf
&& c
->lxc_conf
->haltsignal
)
1349 haltsignal
= c
->lxc_conf
->haltsignal
;
1350 kill(pid
, haltsignal
);
1351 retv
= c
->wait(c
, "STOPPED", timeout
);
1352 if (!retv
&& timeout
> 0) {
1354 retv
= c
->wait(c
, "STOPPED", 0); // 0 means don't wait
1359 static bool lxcapi_createl(struct lxc_container
*c
, const char *t
,
1360 const char *bdevtype
, struct bdev_specs
*specs
, int flags
, ...)
1370 * since we're going to wait for create to finish, I don't think we
1371 * need to get a copy of the arguments.
1373 va_start(ap
, flags
);
1374 args
= lxc_va_arg_list_to_argv(ap
, 0, 0);
1377 ERROR("Memory allocation error.");
1381 bret
= c
->create(c
, t
, bdevtype
, specs
, flags
, args
);
1388 static bool lxcapi_clear_config_item(struct lxc_container
*c
, const char *key
)
1392 if (!c
|| !c
->lxc_conf
)
1394 if (container_mem_lock(c
))
1396 ret
= lxc_clear_config_item(c
->lxc_conf
, key
);
1397 container_mem_unlock(c
);
1401 static inline bool enter_to_ns(struct lxc_container
*c
) {
1402 int netns
, userns
, ret
= 0, init_pid
= 0;;
1403 char new_netns_path
[MAXPATHLEN
];
1404 char new_userns_path
[MAXPATHLEN
];
1406 if (!c
->is_running(c
))
1409 init_pid
= c
->init_pid(c
);
1411 /* Switch to new userns */
1412 if (geteuid() && access("/proc/self/ns/user", F_OK
) == 0) {
1413 ret
= snprintf(new_userns_path
, MAXPATHLEN
, "/proc/%d/ns/user", init_pid
);
1414 if (ret
< 0 || ret
>= MAXPATHLEN
)
1417 userns
= open(new_userns_path
, O_RDONLY
);
1419 SYSERROR("failed to open %s", new_userns_path
);
1423 if (setns(userns
, CLONE_NEWUSER
)) {
1424 SYSERROR("failed to setns for CLONE_NEWUSER");
1431 /* Switch to new netns */
1432 ret
= snprintf(new_netns_path
, MAXPATHLEN
, "/proc/%d/ns/net", init_pid
);
1433 if (ret
< 0 || ret
>= MAXPATHLEN
)
1436 netns
= open(new_netns_path
, O_RDONLY
);
1438 SYSERROR("failed to open %s", new_netns_path
);
1442 if (setns(netns
, CLONE_NEWNET
)) {
1443 SYSERROR("failed to setns for CLONE_NEWNET");
1453 // used by qsort and bsearch functions for comparing names
1454 static inline int string_cmp(char **first
, char **second
)
1456 return strcmp(*first
, *second
);
1459 // used by qsort and bsearch functions for comparing container names
1460 static inline int container_cmp(struct lxc_container
**first
, struct lxc_container
**second
)
1462 return strcmp((*first
)->name
, (*second
)->name
);
1465 static bool add_to_array(char ***names
, char *cname
, int pos
)
1467 char **newnames
= realloc(*names
, (pos
+1) * sizeof(char *));
1469 ERROR("Out of memory");
1474 newnames
[pos
] = strdup(cname
);
1478 // sort the arrray as we will use binary search on it
1479 qsort(newnames
, pos
+ 1, sizeof(char *), (int (*)(const void *,const void *))string_cmp
);
1484 static bool add_to_clist(struct lxc_container
***list
, struct lxc_container
*c
, int pos
, bool sort
)
1486 struct lxc_container
**newlist
= realloc(*list
, (pos
+1) * sizeof(struct lxc_container
*));
1488 ERROR("Out of memory");
1495 // sort the arrray as we will use binary search on it
1497 qsort(newlist
, pos
+ 1, sizeof(struct lxc_container
*), (int (*)(const void *,const void *))container_cmp
);
1502 static char** get_from_array(char ***names
, char *cname
, int size
)
1504 return (char **)bsearch(&cname
, *names
, size
, sizeof(char *), (int (*)(const void *, const void *))string_cmp
);
1508 static bool array_contains(char ***names
, char *cname
, int size
) {
1509 if(get_from_array(names
, cname
, size
) != NULL
)
1514 static bool remove_from_array(char ***names
, char *cname
, int size
)
1516 char **result
= get_from_array(names
, cname
, size
);
1517 if (result
!= NULL
) {
1524 static char** lxcapi_get_interfaces(struct lxc_container
*c
)
1527 int i
, count
= 0, pipefd
[2];
1528 char **interfaces
= NULL
;
1529 char interface
[IFNAMSIZ
];
1531 if(pipe(pipefd
) < 0) {
1532 SYSERROR("pipe failed");
1538 SYSERROR("failed to fork task to get interfaces information\n");
1544 if (pid
== 0) { // child
1545 int ret
= 1, nbytes
;
1546 struct ifaddrs
*interfaceArray
= NULL
, *tempIfAddr
= NULL
;
1548 /* close the read-end of the pipe */
1551 if (!enter_to_ns(c
)) {
1552 SYSERROR("failed to enter namespace");
1556 /* Grab the list of interfaces */
1557 if (getifaddrs(&interfaceArray
)) {
1558 SYSERROR("failed to get interfaces list");
1562 /* Iterate through the interfaces */
1563 for (tempIfAddr
= interfaceArray
; tempIfAddr
!= NULL
; tempIfAddr
= tempIfAddr
->ifa_next
) {
1564 nbytes
= write(pipefd
[1], tempIfAddr
->ifa_name
, IFNAMSIZ
);
1566 ERROR("write failed");
1575 freeifaddrs(interfaceArray
);
1577 /* close the write-end of the pipe, thus sending EOF to the reader */
1582 /* close the write-end of the pipe */
1585 while (read(pipefd
[0], &interface
, IFNAMSIZ
) == IFNAMSIZ
) {
1586 if (array_contains(&interfaces
, interface
, count
))
1589 if(!add_to_array(&interfaces
, interface
, count
))
1590 ERROR("PARENT: add_to_array failed");
1594 if (wait_for_pid(pid
) != 0) {
1595 for(i
=0;i
<count
;i
++)
1596 free(interfaces
[i
]);
1601 /* close the read-end of the pipe */
1604 /* Append NULL to the array */
1606 interfaces
= (char **)lxc_append_null_to_array((void **)interfaces
, count
);
1611 static char** lxcapi_get_ips(struct lxc_container
*c
, const char* interface
, const char* family
, int scope
)
1614 int i
, count
= 0, pipefd
[2];
1615 char **addresses
= NULL
;
1616 char address
[INET6_ADDRSTRLEN
];
1618 if(pipe(pipefd
) < 0) {
1619 SYSERROR("pipe failed");
1625 SYSERROR("failed to fork task to get container ips\n");
1631 if (pid
== 0) { // child
1632 int ret
= 1, nbytes
;
1633 struct ifaddrs
*interfaceArray
= NULL
, *tempIfAddr
= NULL
;
1634 char addressOutputBuffer
[INET6_ADDRSTRLEN
];
1635 void *tempAddrPtr
= NULL
;
1636 char *address
= NULL
;
1638 /* close the read-end of the pipe */
1641 if (!enter_to_ns(c
)) {
1642 SYSERROR("failed to enter namespace");
1646 /* Grab the list of interfaces */
1647 if (getifaddrs(&interfaceArray
)) {
1648 SYSERROR("failed to get interfaces list");
1652 /* Iterate through the interfaces */
1653 for (tempIfAddr
= interfaceArray
; tempIfAddr
!= NULL
; tempIfAddr
= tempIfAddr
->ifa_next
) {
1654 if (tempIfAddr
->ifa_addr
== NULL
)
1657 if(tempIfAddr
->ifa_addr
->sa_family
== AF_INET
) {
1658 if (family
&& strcmp(family
, "inet"))
1660 tempAddrPtr
= &((struct sockaddr_in
*)tempIfAddr
->ifa_addr
)->sin_addr
;
1663 if (family
&& strcmp(family
, "inet6"))
1666 if (((struct sockaddr_in6
*)tempIfAddr
->ifa_addr
)->sin6_scope_id
!= scope
)
1669 tempAddrPtr
= &((struct sockaddr_in6
*)tempIfAddr
->ifa_addr
)->sin6_addr
;
1672 if (interface
&& strcmp(interface
, tempIfAddr
->ifa_name
))
1674 else if (!interface
&& strcmp("lo", tempIfAddr
->ifa_name
) == 0)
1677 address
= (char *)inet_ntop(tempIfAddr
->ifa_addr
->sa_family
,
1679 addressOutputBuffer
,
1680 sizeof(addressOutputBuffer
));
1684 nbytes
= write(pipefd
[1], address
, INET6_ADDRSTRLEN
);
1686 ERROR("write failed");
1695 freeifaddrs(interfaceArray
);
1697 /* close the write-end of the pipe, thus sending EOF to the reader */
1702 /* close the write-end of the pipe */
1705 while (read(pipefd
[0], &address
, INET6_ADDRSTRLEN
) == INET6_ADDRSTRLEN
) {
1706 if(!add_to_array(&addresses
, address
, count
))
1707 ERROR("PARENT: add_to_array failed");
1711 if (wait_for_pid(pid
) != 0) {
1712 for(i
=0;i
<count
;i
++)
1718 /* close the read-end of the pipe */
1721 /* Append NULL to the array */
1723 addresses
= (char **)lxc_append_null_to_array((void **)addresses
, count
);
1728 static int lxcapi_get_config_item(struct lxc_container
*c
, const char *key
, char *retv
, int inlen
)
1732 if (!c
|| !c
->lxc_conf
)
1734 if (container_mem_lock(c
))
1736 ret
= lxc_get_config_item(c
->lxc_conf
, key
, retv
, inlen
);
1737 container_mem_unlock(c
);
1741 static char* lxcapi_get_running_config_item(struct lxc_container
*c
, const char *key
)
1745 if (!c
|| !c
->lxc_conf
)
1747 if (container_mem_lock(c
))
1749 ret
= lxc_cmd_get_config_item(c
->name
, key
, c
->get_config_path(c
));
1750 container_mem_unlock(c
);
1754 static int lxcapi_get_keys(struct lxc_container
*c
, const char *key
, char *retv
, int inlen
)
1757 return lxc_listconfigs(retv
, inlen
);
1759 * Support 'lxc.network.<idx>', i.e. 'lxc.network.0'
1760 * This is an intelligent result to show which keys are valid given
1761 * the type of nic it is
1763 if (!c
|| !c
->lxc_conf
)
1765 if (container_mem_lock(c
))
1768 if (strncmp(key
, "lxc.network.", 12) == 0)
1769 ret
= lxc_list_nicconfigs(c
->lxc_conf
, key
, retv
, inlen
);
1770 container_mem_unlock(c
);
1774 static bool lxcapi_save_config(struct lxc_container
*c
, const char *alt_file
)
1777 bool ret
= false, need_disklock
= false;
1781 alt_file
= c
->configfile
;
1783 return false; // should we write to stdout if no file is specified?
1785 // If we haven't yet loaded a config, load the stock config
1787 if (!c
->load_config(c
, lxc_global_config_value("lxc.default_config"))) {
1788 ERROR("Error loading default configuration file %s while saving %s\n", lxc_global_config_value("lxc.default_config"), c
->name
);
1793 if (!create_container_dir(c
))
1797 * If we're writing to the container's config file, take the
1798 * disk lock. Otherwise just take the memlock to protect the
1799 * struct lxc_container while we're traversing it.
1801 if (strcmp(c
->configfile
, alt_file
) == 0)
1802 need_disklock
= true;
1805 lret
= container_disk_lock(c
);
1807 lret
= container_mem_lock(c
);
1812 fout
= fopen(alt_file
, "w");
1815 write_config(fout
, c
->lxc_conf
);
1821 container_disk_unlock(c
);
1823 container_mem_unlock(c
);
1827 static bool mod_rdep(struct lxc_container
*c
, bool inc
)
1829 char path
[MAXPATHLEN
];
1834 if (container_disk_lock(c
))
1836 ret
= snprintf(path
, MAXPATHLEN
, "%s/%s/lxc_snapshots", c
->config_path
,
1838 if (ret
< 0 || ret
> MAXPATHLEN
)
1840 f
= fopen(path
, "r");
1842 ret
= fscanf(f
, "%d", &v
);
1845 ERROR("Corrupted file %s", path
);
1850 f
= fopen(path
, "w");
1853 if (fprintf(f
, "%d\n", v
) < 0) {
1854 ERROR("Error writing new snapshots value");
1860 SYSERROR("Error writing to or closing snapshots file");
1867 container_disk_unlock(c
);
1871 static void strip_newline(char *p
)
1873 size_t len
= strlen(p
);
1876 if (p
[len
-1] == '\n')
1880 static void mod_all_rdeps(struct lxc_container
*c
, bool inc
)
1882 struct lxc_container
*p
;
1883 char *lxcpath
= NULL
, *lxcname
= NULL
, path
[MAXPATHLEN
];
1884 size_t pathlen
= 0, namelen
= 0;
1888 ret
= snprintf(path
, MAXPATHLEN
, "%s/%s/lxc_rdepends",
1889 c
->config_path
, c
->name
);
1890 if (ret
< 0 || ret
>= MAXPATHLEN
) {
1891 ERROR("Path name too long");
1894 f
= fopen(path
, "r");
1897 while (getline(&lxcpath
, &pathlen
, f
) != -1) {
1898 if (getline(&lxcname
, &namelen
, f
) == -1) {
1899 ERROR("badly formatted file %s\n", path
);
1902 strip_newline(lxcpath
);
1903 strip_newline(lxcname
);
1904 if ((p
= lxc_container_new(lxcname
, lxcpath
)) == NULL
) {
1905 ERROR("Unable to find dependent container %s:%s",
1909 if (!mod_rdep(p
, inc
))
1910 ERROR("Failed to increase numsnapshots for %s:%s",
1912 lxc_container_put(p
);
1915 if (lxcpath
) free(lxcpath
);
1916 if (lxcname
) free(lxcname
);
1920 static bool has_snapshots(struct lxc_container
*c
)
1922 char path
[MAXPATHLEN
];
1927 ret
= snprintf(path
, MAXPATHLEN
, "%s/%s/lxc_snapshots", c
->config_path
,
1929 if (ret
< 0 || ret
> MAXPATHLEN
)
1931 f
= fopen(path
, "r");
1934 ret
= fscanf(f
, "%d", &v
);
1944 static int lxc_rmdir_onedev_wrapper(void *data
)
1946 char *arg
= (char *) data
;
1947 return lxc_rmdir_onedev(arg
);
1950 // do we want the api to support --force, or leave that to the caller?
1951 static bool lxcapi_destroy(struct lxc_container
*c
)
1953 struct bdev
*r
= NULL
;
1957 if (!c
|| !lxcapi_is_defined(c
))
1960 if (container_disk_lock(c
))
1963 if (!is_stopped(c
)) {
1964 // we should queue some sort of error - in c->error_string?
1965 ERROR("container %s is not stopped", c
->name
);
1969 if (c
->lxc_conf
&& has_snapshots(c
)) {
1970 ERROR("container %s has dependent snapshots", c
->name
);
1974 if (!am_unpriv() && c
->lxc_conf
&& c
->lxc_conf
->rootfs
.path
&& c
->lxc_conf
->rootfs
.mount
) {
1975 r
= bdev_init(c
->lxc_conf
->rootfs
.path
, c
->lxc_conf
->rootfs
.mount
, NULL
);
1977 if (r
->ops
->destroy(r
) < 0) {
1979 ERROR("Error destroying rootfs for %s", c
->name
);
1986 mod_all_rdeps(c
, false);
1988 const char *p1
= lxcapi_get_config_path(c
);
1989 char *path
= alloca(strlen(p1
) + strlen(c
->name
) + 2);
1990 sprintf(path
, "%s/%s", p1
, c
->name
);
1992 ret
= userns_exec_1(c
->lxc_conf
, lxc_rmdir_onedev_wrapper
, path
);
1994 ret
= lxc_rmdir_onedev(path
);
1996 ERROR("Error destroying container directory for %s", c
->name
);
2002 container_disk_unlock(c
);
2006 static bool set_config_item_locked(struct lxc_container
*c
, const char *key
, const char *v
)
2008 struct lxc_config_t
*config
;
2011 c
->lxc_conf
= lxc_conf_init();
2014 config
= lxc_getconfig(key
);
2017 return (0 == config
->cb(key
, v
, c
->lxc_conf
));
2020 static bool lxcapi_set_config_item(struct lxc_container
*c
, const char *key
, const char *v
)
2027 if (container_mem_lock(c
))
2030 b
= set_config_item_locked(c
, key
, v
);
2032 container_mem_unlock(c
);
2036 static char *lxcapi_config_file_name(struct lxc_container
*c
)
2038 if (!c
|| !c
->configfile
)
2040 return strdup(c
->configfile
);
2043 static const char *lxcapi_get_config_path(struct lxc_container
*c
)
2045 if (!c
|| !c
->config_path
)
2047 return (const char *)(c
->config_path
);
2052 * Just recalculate the c->configfile based on the
2053 * c->config_path, which must be set.
2054 * The lxc_container must be locked or not yet public.
2056 static bool set_config_filename(struct lxc_container
*c
)
2061 if (!c
->config_path
)
2064 /* $lxc_path + "/" + c->name + "/" + "config" + '\0' */
2065 len
= strlen(c
->config_path
) + strlen(c
->name
) + strlen("config") + 3;
2066 newpath
= malloc(len
);
2070 ret
= snprintf(newpath
, len
, "%s/%s/config", c
->config_path
, c
->name
);
2071 if (ret
< 0 || ret
>= len
) {
2072 fprintf(stderr
, "Error printing out config file name\n");
2078 free(c
->configfile
);
2079 c
->configfile
= newpath
;
2084 static bool lxcapi_set_config_path(struct lxc_container
*c
, const char *path
)
2088 char *oldpath
= NULL
;
2093 if (container_mem_lock(c
))
2098 ERROR("Out of memory setting new lxc path");
2104 oldpath
= c
->config_path
;
2107 /* Since we've changed the config path, we have to change the
2108 * config file name too */
2109 if (!set_config_filename(c
)) {
2110 ERROR("Out of memory setting new config filename");
2112 free(c
->config_path
);
2113 c
->config_path
= oldpath
;
2119 container_mem_unlock(c
);
2124 static bool lxcapi_set_cgroup_item(struct lxc_container
*c
, const char *subsys
, const char *value
)
2134 if (container_disk_lock(c
))
2137 ret
= lxc_cgroup_set(subsys
, value
, c
->name
, c
->config_path
);
2139 container_disk_unlock(c
);
2143 static int lxcapi_get_cgroup_item(struct lxc_container
*c
, const char *subsys
, char *retv
, int inlen
)
2153 if (container_disk_lock(c
))
2156 ret
= lxc_cgroup_get(subsys
, retv
, inlen
, c
->name
, c
->config_path
);
2158 container_disk_unlock(c
);
2162 const char *lxc_get_global_config_item(const char *key
)
2164 return lxc_global_config_value(key
);
2167 const char *lxc_get_version(void)
2172 static int copy_file(const char *old
, const char *new)
2179 if (file_exists(new)) {
2180 ERROR("copy destination %s exists", new);
2183 ret
= stat(old
, &sbuf
);
2185 INFO("Error stat'ing %s", old
);
2189 in
= open(old
, O_RDONLY
);
2191 SYSERROR("Error opening original file %s", old
);
2194 out
= open(new, O_CREAT
| O_EXCL
| O_WRONLY
, 0644);
2196 SYSERROR("Error opening new file %s", new);
2202 len
= read(in
, buf
, 8096);
2204 SYSERROR("Error reading old file %s", old
);
2209 ret
= write(out
, buf
, len
);
2210 if (ret
< len
) { // should we retry?
2211 SYSERROR("Error: write to new file %s was interrupted", new);
2218 // we set mode, but not owner/group
2219 ret
= chmod(new, sbuf
.st_mode
);
2221 SYSERROR("Error setting mode on %s", new);
2233 static int copyhooks(struct lxc_container
*oldc
, struct lxc_container
*c
)
2236 struct lxc_list
*it
;
2239 len
= strlen(oldc
->config_path
) + strlen(oldc
->name
) + 3;
2240 cpath
= alloca(len
);
2241 ret
= snprintf(cpath
, len
, "%s/%s/", oldc
->config_path
, oldc
->name
);
2242 if (ret
< 0 || ret
>= len
)
2245 for (i
=0; i
<NUM_LXC_HOOKS
; i
++) {
2246 lxc_list_for_each(it
, &c
->lxc_conf
->hooks
[i
]) {
2247 char *hookname
= it
->elem
;
2248 char *fname
= strrchr(hookname
, '/');
2249 char tmppath
[MAXPATHLEN
];
2250 if (!fname
) // relative path - we don't support, but maybe we should
2252 if (strncmp(hookname
, cpath
, len
- 1) != 0) {
2253 // this hook is public - ignore
2256 // copy the script, and change the entry in confile
2257 ret
= snprintf(tmppath
, MAXPATHLEN
, "%s/%s/%s",
2258 c
->config_path
, c
->name
, fname
+1);
2259 if (ret
< 0 || ret
>= MAXPATHLEN
)
2261 ret
= copy_file(it
->elem
, tmppath
);
2265 it
->elem
= strdup(tmppath
);
2267 ERROR("out of memory copying hook path");
2273 c
->save_config(c
, NULL
);
2277 static void new_hwaddr(char *hwaddr
)
2280 f
= fopen("/dev/urandom", "r");
2283 int ret
= fread(&seed
, sizeof(seed
), 1, f
);
2290 snprintf(hwaddr
, 18, "00:16:3e:%02x:%02x:%02x",
2291 rand() % 255, rand() % 255, rand() % 255);
2294 static void network_new_hwaddrs(struct lxc_container
*c
)
2296 struct lxc_list
*it
;
2298 lxc_list_for_each(it
, &c
->lxc_conf
->network
) {
2299 struct lxc_netdev
*n
= it
->elem
;
2301 new_hwaddr(n
->hwaddr
);
2305 static int copy_fstab(struct lxc_container
*oldc
, struct lxc_container
*c
)
2307 char newpath
[MAXPATHLEN
];
2308 char *oldpath
= oldc
->lxc_conf
->fstab
;
2314 char *p
= strrchr(oldpath
, '/');
2317 ret
= snprintf(newpath
, MAXPATHLEN
, "%s/%s%s",
2318 c
->config_path
, c
->name
, p
);
2319 if (ret
< 0 || ret
>= MAXPATHLEN
) {
2320 ERROR("error printing new path for %s", oldpath
);
2323 if (file_exists(newpath
)) {
2324 ERROR("error: fstab file %s exists", newpath
);
2328 if (copy_file(oldpath
, newpath
) < 0) {
2329 ERROR("error: copying %s to %s", oldpath
, newpath
);
2332 free(c
->lxc_conf
->fstab
);
2333 c
->lxc_conf
->fstab
= strdup(newpath
);
2334 if (!c
->lxc_conf
->fstab
) {
2335 ERROR("error: allocating pathname");
2342 static void copy_rdepends(struct lxc_container
*c
, struct lxc_container
*c0
)
2344 char path0
[MAXPATHLEN
], path1
[MAXPATHLEN
];
2347 ret
= snprintf(path0
, MAXPATHLEN
, "%s/%s/lxc_rdepends", c0
->config_path
,
2349 if (ret
< 0 || ret
>= MAXPATHLEN
) {
2350 WARN("Error copying reverse dependencies");
2353 ret
= snprintf(path1
, MAXPATHLEN
, "%s/%s/lxc_rdepends", c
->config_path
,
2355 if (ret
< 0 || ret
>= MAXPATHLEN
) {
2356 WARN("Error copying reverse dependencies");
2359 if (copy_file(path0
, path1
) < 0) {
2360 INFO("Error copying reverse dependencies");
2365 static bool add_rdepends(struct lxc_container
*c
, struct lxc_container
*c0
)
2368 char path
[MAXPATHLEN
];
2372 ret
= snprintf(path
, MAXPATHLEN
, "%s/%s/lxc_rdepends", c
->config_path
,
2374 if (ret
< 0 || ret
>= MAXPATHLEN
)
2376 f
= fopen(path
, "a");
2380 // if anything goes wrong, just return an error
2381 if (fprintf(f
, "%s\n%s\n", c0
->config_path
, c0
->name
) < 0)
2388 static int copy_storage(struct lxc_container
*c0
, struct lxc_container
*c
,
2389 const char *newtype
, int flags
, const char *bdevdata
, uint64_t newsize
)
2394 bdev
= bdev_copy(c0
, c
->name
, c
->config_path
, newtype
, flags
,
2395 bdevdata
, newsize
, &need_rdep
);
2397 ERROR("Error copying storage");
2400 free(c
->lxc_conf
->rootfs
.path
);
2401 c
->lxc_conf
->rootfs
.path
= strdup(bdev
->src
);
2403 if (!c
->lxc_conf
->rootfs
.path
) {
2404 ERROR("Out of memory while setting storage path");
2407 if (flags
& LXC_CLONE_SNAPSHOT
)
2408 copy_rdepends(c
, c0
);
2410 if (!add_rdepends(c
, c0
))
2411 WARN("Error adding reverse dependency from %s to %s",
2415 mod_all_rdeps(c
, true);
2420 struct clone_update_data
{
2421 struct lxc_container
*c0
;
2422 struct lxc_container
*c1
;
2427 static int clone_update_rootfs(struct clone_update_data
*data
)
2429 struct lxc_container
*c0
= data
->c0
;
2430 struct lxc_container
*c
= data
->c1
;
2431 int flags
= data
->flags
;
2432 char **hookargs
= data
->hookargs
;
2434 char path
[MAXPATHLEN
];
2437 struct lxc_conf
*conf
= c
->lxc_conf
;
2439 /* update hostname in rootfs */
2440 /* we're going to mount, so run in a clean namespace to simplify cleanup */
2442 if (setgid(0) < 0) {
2443 ERROR("Failed to setgid to 0");
2446 if (setuid(0) < 0) {
2447 ERROR("Failed to setuid to 0");
2451 if (unshare(CLONE_NEWNS
) < 0)
2453 bdev
= bdev_init(c
->lxc_conf
->rootfs
.path
, c
->lxc_conf
->rootfs
.mount
, NULL
);
2456 if (strcmp(bdev
->type
, "dir") != 0) {
2457 if (unshare(CLONE_NEWNS
) < 0) {
2458 ERROR("error unsharing mounts");
2461 if (bdev
->ops
->mount(bdev
) < 0)
2463 } else { // TODO come up with a better way
2466 bdev
->dest
= strdup(bdev
->src
);
2469 if (!lxc_list_empty(&conf
->hooks
[LXCHOOK_CLONE
])) {
2470 /* Start of environment variable setup for hooks */
2471 if (setenv("LXC_SRC_NAME", c0
->name
, 1)) {
2472 SYSERROR("failed to set environment variable for source container name");
2474 if (setenv("LXC_NAME", c
->name
, 1)) {
2475 SYSERROR("failed to set environment variable for container name");
2477 if (setenv("LXC_CONFIG_FILE", conf
->rcfile
, 1)) {
2478 SYSERROR("failed to set environment variable for config path");
2480 if (setenv("LXC_ROOTFS_MOUNT", bdev
->dest
, 1)) {
2481 SYSERROR("failed to set environment variable for rootfs mount");
2483 if (setenv("LXC_ROOTFS_PATH", conf
->rootfs
.path
, 1)) {
2484 SYSERROR("failed to set environment variable for rootfs mount");
2487 if (run_lxc_hooks(c
->name
, "clone", conf
, c
->get_config_path(c
), hookargs
)) {
2488 ERROR("Error executing clone hook for %s", c
->name
);
2493 if (!(flags
& LXC_CLONE_KEEPNAME
)) {
2494 ret
= snprintf(path
, MAXPATHLEN
, "%s/etc/hostname", bdev
->dest
);
2495 if (ret
< 0 || ret
>= MAXPATHLEN
)
2497 if (!file_exists(path
))
2499 if (!(fout
= fopen(path
, "w"))) {
2500 SYSERROR("unable to open %s: ignoring\n", path
);
2503 if (fprintf(fout
, "%s", c
->name
) < 0) {
2507 if (fclose(fout
) < 0)
2513 static int clone_update_rootfs_wrapper(void *data
)
2515 struct clone_update_data
*arg
= (struct clone_update_data
*) data
;
2516 return clone_update_rootfs(arg
);
2520 * We want to support:
2521 sudo lxc-clone -o o1 -n n1 -s -L|-fssize fssize -v|--vgname vgname \
2522 -p|--lvprefix lvprefix -t|--fstype fstype -B backingstore
2524 -s [ implies overlayfs]
2528 only rootfs gets converted (copied/snapshotted) on clone.
2531 static int create_file_dirname(char *path
)
2533 char *p
= strrchr(path
, '/');
2539 ret
= mkdir(path
, 0755);
2540 if (ret
&& errno
!= EEXIST
)
2541 SYSERROR("creating container path %s\n", path
);
2546 static struct lxc_container
*lxcapi_clone(struct lxc_container
*c
, const char *newname
,
2547 const char *lxcpath
, int flags
,
2548 const char *bdevtype
, const char *bdevdata
, uint64_t newsize
,
2551 struct lxc_container
*c2
= NULL
;
2552 char newpath
[MAXPATHLEN
];
2553 int ret
, storage_copied
= 0;
2555 struct clone_update_data data
;
2559 if (!c
|| !c
->is_defined(c
))
2562 if (container_mem_lock(c
))
2565 if (!is_stopped(c
)) {
2566 ERROR("error: Original container (%s) is running", c
->name
);
2570 // Make sure the container doesn't yet exist.
2571 n
= newname
? newname
: c
->name
;
2572 l
= lxcpath
? lxcpath
: c
->get_config_path(c
);
2573 ret
= snprintf(newpath
, MAXPATHLEN
, "%s/%s/config", l
, n
);
2574 if (ret
< 0 || ret
>= MAXPATHLEN
) {
2575 SYSERROR("clone: failed making config pathname");
2578 if (file_exists(newpath
)) {
2579 ERROR("error: clone: %s exists", newpath
);
2583 ret
= create_file_dirname(newpath
);
2584 if (ret
< 0 && errno
!= EEXIST
) {
2585 ERROR("Error creating container dir for %s", newpath
);
2589 // copy the configuration, tweak it as needed,
2590 fout
= fopen(newpath
, "w");
2592 SYSERROR("open %s", newpath
);
2595 write_config(fout
, c
->lxc_conf
);
2598 sprintf(newpath
, "%s/%s/rootfs", l
, n
);
2599 if (mkdir(newpath
, 0755) < 0) {
2600 SYSERROR("error creating %s", newpath
);
2605 if (chown_mapped_root(newpath
, c
->lxc_conf
) < 0) {
2606 ERROR("Error chowning %s to container root\n", newpath
);
2611 c2
= lxc_container_new(n
, l
);
2613 ERROR("clone: failed to create new container (%s %s)", n
, l
);
2618 if (!set_config_item_locked(c2
, "lxc.utsname", newname
)) {
2619 ERROR("Error setting new hostname");
2624 ret
= copyhooks(c
, c2
);
2626 ERROR("error copying hooks");
2630 if (copy_fstab(c
, c2
) < 0) {
2631 ERROR("error copying fstab");
2636 if (!(flags
& LXC_CLONE_KEEPMACADDR
))
2637 network_new_hwaddrs(c2
);
2639 // copy/snapshot rootfs's
2640 ret
= copy_storage(c
, c2
, bdevtype
, flags
, bdevdata
, newsize
);
2644 // We've now successfully created c2's storage, so clear it out if we
2648 if (!c2
->save_config(c2
, NULL
))
2651 if ((pid
= fork()) < 0) {
2656 ret
= wait_for_pid(pid
);
2659 container_mem_unlock(c
);
2665 data
.hookargs
= hookargs
;
2667 ret
= userns_exec_1(c
->lxc_conf
, clone_update_rootfs_wrapper
,
2670 ret
= clone_update_rootfs(&data
);
2674 container_mem_unlock(c
);
2678 container_mem_unlock(c
);
2680 if (!storage_copied
)
2681 c2
->lxc_conf
->rootfs
.path
= NULL
;
2683 lxc_container_put(c2
);
2689 static bool lxcapi_rename(struct lxc_container
*c
, const char *newname
)
2692 struct lxc_container
*newc
;
2694 if (!c
|| !c
->name
|| !c
->config_path
)
2697 bdev
= bdev_init(c
->lxc_conf
->rootfs
.path
, c
->lxc_conf
->rootfs
.mount
, NULL
);
2699 ERROR("Failed to find original backing store type");
2703 newc
= lxcapi_clone(c
, newname
, c
->config_path
, LXC_CLONE_KEEPMACADDR
, NULL
, bdev
->type
, 0, NULL
);
2706 lxc_container_put(newc
);
2710 if (newc
&& lxcapi_is_defined(newc
))
2711 lxc_container_put(newc
);
2713 if (!lxcapi_destroy(c
)) {
2714 ERROR("Could not destroy existing container %s", c
->name
);
2720 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
)
2725 return lxc_attach(c
->name
, c
->config_path
, exec_function
, exec_payload
, options
, attached_process
);
2728 static int lxcapi_attach_run_wait(struct lxc_container
*c
, lxc_attach_options_t
*options
, const char *program
, const char * const argv
[])
2730 lxc_attach_command_t command
;
2737 command
.program
= (char*)program
;
2738 command
.argv
= (char**)argv
;
2739 r
= lxc_attach(c
->name
, c
->config_path
, lxc_attach_run_command
, &command
, options
, &pid
);
2744 return lxc_wait_for_pid_status(pid
);
2747 static int get_next_index(const char *lxcpath
, char *cname
)
2753 fname
= alloca(strlen(lxcpath
) + 20);
2755 sprintf(fname
, "%s/snap%d", lxcpath
, i
);
2756 ret
= stat(fname
, &sb
);
2763 static int lxcapi_snapshot(struct lxc_container
*c
, const char *commentfile
)
2766 struct lxc_container
*c2
;
2767 char snappath
[MAXPATHLEN
], newname
[20];
2769 // /var/lib/lxc -> /var/lib/lxcsnaps \0
2770 ret
= snprintf(snappath
, MAXPATHLEN
, "%ssnaps/%s", c
->config_path
, c
->name
);
2771 if (ret
< 0 || ret
>= MAXPATHLEN
)
2773 i
= get_next_index(snappath
, c
->name
);
2775 if (mkdir_p(snappath
, 0755) < 0) {
2776 ERROR("Failed to create snapshot directory %s", snappath
);
2780 ret
= snprintf(newname
, 20, "snap%d", i
);
2781 if (ret
< 0 || ret
>= 20)
2785 * We pass LXC_CLONE_SNAPSHOT to make sure that a rdepends file entry is
2786 * created in the original container
2788 flags
= LXC_CLONE_SNAPSHOT
| LXC_CLONE_KEEPMACADDR
| LXC_CLONE_KEEPNAME
|
2789 LXC_CLONE_KEEPBDEVTYPE
| LXC_CLONE_MAYBE_SNAPSHOT
;
2790 c2
= c
->clone(c
, newname
, snappath
, flags
, NULL
, NULL
, 0, NULL
);
2792 ERROR("clone of %s:%s failed\n", c
->config_path
, c
->name
);
2796 lxc_container_put(c2
);
2798 // Now write down the creation time
2805 tm_info
= localtime(&timer
);
2807 strftime(buffer
, 25, "%Y:%m:%d %H:%M:%S", tm_info
);
2809 char *dfnam
= alloca(strlen(snappath
) + strlen(newname
) + 5);
2810 sprintf(dfnam
, "%s/%s/ts", snappath
, newname
);
2811 f
= fopen(dfnam
, "w");
2813 ERROR("Failed to open %s\n", dfnam
);
2816 if (fprintf(f
, "%s", buffer
) < 0) {
2817 SYSERROR("Writing timestamp");
2823 SYSERROR("Writing timestamp");
2828 // $p / $name / comment \0
2829 int len
= strlen(snappath
) + strlen(newname
) + 10;
2830 char *path
= alloca(len
);
2831 sprintf(path
, "%s/%s/comment", snappath
, newname
);
2832 return copy_file(commentfile
, path
) < 0 ? -1 : i
;
2838 static void lxcsnap_free(struct lxc_snapshot
*s
)
2842 if (s
->comment_pathname
)
2843 free(s
->comment_pathname
);
2850 static char *get_snapcomment_path(char* snappath
, char *name
)
2852 // $snappath/$name/comment
2853 int ret
, len
= strlen(snappath
) + strlen(name
) + 10;
2854 char *s
= malloc(len
);
2857 ret
= snprintf(s
, len
, "%s/%s/comment", snappath
, name
);
2858 if (ret
< 0 || ret
>= len
) {
2866 static char *get_timestamp(char* snappath
, char *name
)
2868 char path
[MAXPATHLEN
], *s
= NULL
;
2872 ret
= snprintf(path
, MAXPATHLEN
, "%s/%s/ts", snappath
, name
);
2873 if (ret
< 0 || ret
>= MAXPATHLEN
)
2875 fin
= fopen(path
, "r");
2878 (void) fseek(fin
, 0, SEEK_END
);
2880 (void) fseek(fin
, 0, SEEK_SET
);
2885 if (fread(s
, 1, len
, fin
) != len
) {
2886 SYSERROR("reading timestamp");
2896 static int lxcapi_snapshot_list(struct lxc_container
*c
, struct lxc_snapshot
**ret_snaps
)
2898 char snappath
[MAXPATHLEN
], path2
[MAXPATHLEN
];
2899 int dirlen
, count
= 0, ret
;
2900 struct dirent dirent
, *direntp
;
2901 struct lxc_snapshot
*snaps
=NULL
, *nsnaps
;
2904 if (!c
|| !lxcapi_is_defined(c
))
2907 // snappath is ${lxcpath}snaps/${lxcname}/
2908 dirlen
= snprintf(snappath
, MAXPATHLEN
, "%ssnaps/%s", c
->config_path
, c
->name
);
2909 if (dirlen
< 0 || dirlen
>= MAXPATHLEN
) {
2910 ERROR("path name too long");
2913 dir
= opendir(snappath
);
2915 INFO("failed to open %s - assuming no snapshots", snappath
);
2919 while (!readdir_r(dir
, &dirent
, &direntp
)) {
2923 if (!strcmp(direntp
->d_name
, "."))
2926 if (!strcmp(direntp
->d_name
, ".."))
2929 ret
= snprintf(path2
, MAXPATHLEN
, "%s/%s/config", snappath
, direntp
->d_name
);
2930 if (ret
< 0 || ret
>= MAXPATHLEN
) {
2931 ERROR("pathname too long");
2934 if (!file_exists(path2
))
2936 nsnaps
= realloc(snaps
, (count
+ 1)*sizeof(*snaps
));
2938 SYSERROR("Out of memory");
2942 snaps
[count
].free
= lxcsnap_free
;
2943 snaps
[count
].name
= strdup(direntp
->d_name
);
2944 if (!snaps
[count
].name
)
2946 snaps
[count
].lxcpath
= strdup(snappath
);
2947 if (!snaps
[count
].lxcpath
) {
2948 free(snaps
[count
].name
);
2951 snaps
[count
].comment_pathname
= get_snapcomment_path(snappath
, direntp
->d_name
);
2952 snaps
[count
].timestamp
= get_timestamp(snappath
, direntp
->d_name
);
2957 WARN("failed to close directory");
2965 for (i
=0; i
<count
; i
++)
2966 lxcsnap_free(&snaps
[i
]);
2970 WARN("failed to close directory");
2974 static bool lxcapi_snapshot_restore(struct lxc_container
*c
, const char *snapname
, const char *newname
)
2976 char clonelxcpath
[MAXPATHLEN
];
2978 struct lxc_container
*snap
, *rest
;
2982 if (!c
|| !c
->name
|| !c
->config_path
)
2985 bdev
= bdev_init(c
->lxc_conf
->rootfs
.path
, c
->lxc_conf
->rootfs
.mount
, NULL
);
2987 ERROR("Failed to find original backing store type");
2993 if (strcmp(c
->name
, newname
) == 0) {
2994 if (!lxcapi_destroy(c
)) {
2995 ERROR("Could not destroy existing container %s", newname
);
3000 ret
= snprintf(clonelxcpath
, MAXPATHLEN
, "%ssnaps/%s", c
->config_path
, c
->name
);
3001 if (ret
< 0 || ret
>= MAXPATHLEN
) {
3005 // how should we lock this?
3007 snap
= lxc_container_new(snapname
, clonelxcpath
);
3008 if (!snap
|| !lxcapi_is_defined(snap
)) {
3009 ERROR("Could not open snapshot %s", snapname
);
3010 if (snap
) lxc_container_put(snap
);
3015 rest
= lxcapi_clone(snap
, newname
, c
->config_path
, 0, bdev
->type
, NULL
, 0, NULL
);
3017 if (rest
&& lxcapi_is_defined(rest
))
3020 lxc_container_put(rest
);
3021 lxc_container_put(snap
);
3025 static bool lxcapi_snapshot_destroy(struct lxc_container
*c
, const char *snapname
)
3028 char clonelxcpath
[MAXPATHLEN
];
3029 struct lxc_container
*snap
= NULL
;
3031 if (!c
|| !c
->name
|| !c
->config_path
)
3034 ret
= snprintf(clonelxcpath
, MAXPATHLEN
, "%ssnaps/%s", c
->config_path
, c
->name
);
3035 if (ret
< 0 || ret
>= MAXPATHLEN
)
3038 snap
= lxc_container_new(snapname
, clonelxcpath
);
3039 if (!snap
|| !lxcapi_is_defined(snap
)) {
3040 ERROR("Could not find snapshot %s", snapname
);
3044 if (!lxcapi_destroy(snap
)) {
3045 ERROR("Could not destroy snapshot %s", snapname
);
3048 lxc_container_put(snap
);
3053 lxc_container_put(snap
);
3057 static bool lxcapi_may_control(struct lxc_container
*c
)
3059 return lxc_try_cmd(c
->name
, c
->config_path
) == 0;
3062 static bool add_remove_device_node(struct lxc_container
*c
, const char *src_path
, const char *dest_path
, bool add
)
3066 char path
[MAXPATHLEN
];
3067 char value
[MAX_BUFFER
];
3068 char *directory_path
= NULL
;
3071 /* make sure container is running */
3072 if (!c
->is_running(c
)) {
3073 ERROR("container is not running");
3077 /* use src_path if dest_path is NULL otherwise use dest_path */
3078 p
= dest_path
? dest_path
: src_path
;
3080 /* prepare the path */
3081 ret
= snprintf(path
, MAXPATHLEN
, "/proc/%d/root/%s", c
->init_pid(c
), p
);
3082 if (ret
< 0 || ret
>= MAXPATHLEN
)
3084 remove_trailing_slashes(path
);
3086 p
= add
? src_path
: path
;
3087 /* make sure we can access p */
3088 if(access(p
, F_OK
) < 0 || stat(p
, &st
) < 0)
3091 /* continue if path is character device or block device */
3092 if (S_ISCHR(st
.st_mode
))
3093 ret
= snprintf(value
, MAX_BUFFER
, "c %d:%d rwm", major(st
.st_rdev
), minor(st
.st_rdev
));
3094 else if (S_ISBLK(st
.st_mode
))
3095 ret
= snprintf(value
, MAX_BUFFER
, "b %d:%d rwm", major(st
.st_rdev
), minor(st
.st_rdev
));
3099 /* check snprintf return code */
3100 if (ret
< 0 || ret
>= MAX_BUFFER
)
3103 directory_path
= dirname(strdup(path
));
3104 /* remove path and directory_path (if empty) */
3105 if(access(path
, F_OK
) == 0) {
3106 if (unlink(path
) < 0) {
3107 ERROR("unlink failed");
3110 if (rmdir(directory_path
) < 0 && errno
!= ENOTEMPTY
) {
3111 ERROR("rmdir failed");
3117 /* create the missing directories */
3118 if (mkdir_p(directory_path
, 0755) < 0) {
3119 ERROR("failed to create directory");
3123 /* create the device node */
3124 if (mknod(path
, st
.st_mode
, st
.st_rdev
) < 0) {
3125 ERROR("mknod failed");
3129 /* add device node to device list */
3130 if (!c
->set_cgroup_item(c
, "devices.allow", value
)) {
3131 ERROR("set_cgroup_item failed while adding the device node");
3135 /* remove device node from device list */
3136 if (!c
->set_cgroup_item(c
, "devices.deny", value
)) {
3137 ERROR("set_cgroup_item failed while removing the device node");
3144 free(directory_path
);
3148 static bool lxcapi_add_device_node(struct lxc_container
*c
, const char *src_path
, const char *dest_path
)
3151 ERROR(NOT_SUPPORTED_ERROR
, __FUNCTION__
);
3154 return add_remove_device_node(c
, src_path
, dest_path
, true);
3157 static bool lxcapi_remove_device_node(struct lxc_container
*c
, const char *src_path
, const char *dest_path
)
3160 ERROR(NOT_SUPPORTED_ERROR
, __FUNCTION__
);
3163 return add_remove_device_node(c
, src_path
, dest_path
, false);
3166 static int lxcapi_attach_run_waitl(struct lxc_container
*c
, lxc_attach_options_t
*options
, const char *program
, const char *arg
, ...)
3176 argv
= lxc_va_arg_list_to_argv_const(ap
, 1);
3180 ERROR("Memory allocation error.");
3185 ret
= lxcapi_attach_run_wait(c
, options
, program
, (const char * const *)argv
);
3190 struct lxc_container
*lxc_container_new(const char *name
, const char *configpath
)
3192 struct lxc_container
*c
;
3194 c
= malloc(sizeof(*c
));
3196 fprintf(stderr
, "failed to malloc lxc_container\n");
3199 memset(c
, 0, sizeof(*c
));
3202 c
->config_path
= strdup(configpath
);
3204 c
->config_path
= strdup(lxc_global_config_value("lxc.lxcpath"));
3206 if (!c
->config_path
) {
3207 fprintf(stderr
, "Out of memory");
3211 remove_trailing_slashes(c
->config_path
);
3212 c
->name
= malloc(strlen(name
)+1);
3214 fprintf(stderr
, "Error allocating lxc_container name\n");
3217 strcpy(c
->name
, name
);
3220 if (!(c
->slock
= lxc_newlock(c
->config_path
, name
))) {
3221 fprintf(stderr
, "failed to create lock\n");
3225 if (!(c
->privlock
= lxc_newlock(NULL
, NULL
))) {
3226 fprintf(stderr
, "failed to alloc privlock\n");
3230 if (!set_config_filename(c
)) {
3231 fprintf(stderr
, "Error allocating config file pathname\n");
3235 if (file_exists(c
->configfile
))
3236 lxcapi_load_config(c
, NULL
);
3238 if (ongoing_create(c
) == 2) {
3239 ERROR("Error: %s creation was not completed", c
->name
);
3241 lxcapi_clear_config(c
);
3243 c
->daemonize
= true;
3246 // assign the member functions
3247 c
->is_defined
= lxcapi_is_defined
;
3248 c
->state
= lxcapi_state
;
3249 c
->is_running
= lxcapi_is_running
;
3250 c
->freeze
= lxcapi_freeze
;
3251 c
->unfreeze
= lxcapi_unfreeze
;
3252 c
->console
= lxcapi_console
;
3253 c
->console_getfd
= lxcapi_console_getfd
;
3254 c
->init_pid
= lxcapi_init_pid
;
3255 c
->load_config
= lxcapi_load_config
;
3256 c
->want_daemonize
= lxcapi_want_daemonize
;
3257 c
->want_close_all_fds
= lxcapi_want_close_all_fds
;
3258 c
->start
= lxcapi_start
;
3259 c
->startl
= lxcapi_startl
;
3260 c
->stop
= lxcapi_stop
;
3261 c
->config_file_name
= lxcapi_config_file_name
;
3262 c
->wait
= lxcapi_wait
;
3263 c
->set_config_item
= lxcapi_set_config_item
;
3264 c
->destroy
= lxcapi_destroy
;
3265 c
->rename
= lxcapi_rename
;
3266 c
->save_config
= lxcapi_save_config
;
3267 c
->get_keys
= lxcapi_get_keys
;
3268 c
->create
= lxcapi_create
;
3269 c
->createl
= lxcapi_createl
;
3270 c
->shutdown
= lxcapi_shutdown
;
3271 c
->reboot
= lxcapi_reboot
;
3272 c
->clear_config
= lxcapi_clear_config
;
3273 c
->clear_config_item
= lxcapi_clear_config_item
;
3274 c
->get_config_item
= lxcapi_get_config_item
;
3275 c
->get_running_config_item
= lxcapi_get_running_config_item
;
3276 c
->get_cgroup_item
= lxcapi_get_cgroup_item
;
3277 c
->set_cgroup_item
= lxcapi_set_cgroup_item
;
3278 c
->get_config_path
= lxcapi_get_config_path
;
3279 c
->set_config_path
= lxcapi_set_config_path
;
3280 c
->clone
= lxcapi_clone
;
3281 c
->get_interfaces
= lxcapi_get_interfaces
;
3282 c
->get_ips
= lxcapi_get_ips
;
3283 c
->attach
= lxcapi_attach
;
3284 c
->attach_run_wait
= lxcapi_attach_run_wait
;
3285 c
->attach_run_waitl
= lxcapi_attach_run_waitl
;
3286 c
->snapshot
= lxcapi_snapshot
;
3287 c
->snapshot_list
= lxcapi_snapshot_list
;
3288 c
->snapshot_restore
= lxcapi_snapshot_restore
;
3289 c
->snapshot_destroy
= lxcapi_snapshot_destroy
;
3290 c
->may_control
= lxcapi_may_control
;
3291 c
->add_device_node
= lxcapi_add_device_node
;
3292 c
->remove_device_node
= lxcapi_remove_device_node
;
3294 /* we'll allow the caller to update these later */
3295 if (lxc_log_init(NULL
, "none", NULL
, "lxc_container", 0, c
->config_path
)) {
3296 fprintf(stderr
, "failed to open log\n");
3303 lxc_container_free(c
);
3307 int lxc_get_wait_states(const char **states
)
3312 for (i
=0; i
<MAX_STATE
; i
++)
3313 states
[i
] = lxc_state2str(i
);
3318 * These next two could probably be done smarter with reusing a common function
3319 * with different iterators and tests...
3321 int list_defined_containers(const char *lxcpath
, char ***names
, struct lxc_container
***cret
)
3324 int i
, cfound
= 0, nfound
= 0;
3325 struct dirent dirent
, *direntp
;
3326 struct lxc_container
*c
;
3329 lxcpath
= lxc_global_config_value("lxc.lxcpath");
3331 dir
= opendir(lxcpath
);
3333 SYSERROR("opendir on lxcpath");
3342 while (!readdir_r(dir
, &dirent
, &direntp
)) {
3345 if (!strcmp(direntp
->d_name
, "."))
3347 if (!strcmp(direntp
->d_name
, ".."))
3350 if (!config_file_exists(lxcpath
, direntp
->d_name
))
3354 if (!add_to_array(names
, direntp
->d_name
, cfound
))
3364 c
= lxc_container_new(direntp
->d_name
, lxcpath
);
3366 INFO("Container %s:%s has a config but could not be loaded",
3367 lxcpath
, direntp
->d_name
);
3369 if(!remove_from_array(names
, direntp
->d_name
, cfound
--))
3373 if (!lxcapi_is_defined(c
)) {
3374 INFO("Container %s:%s has a config but is not defined",
3375 lxcpath
, direntp
->d_name
);
3377 if(!remove_from_array(names
, direntp
->d_name
, cfound
--))
3379 lxc_container_put(c
);
3383 if (!add_to_clist(cret
, c
, nfound
, true)) {
3384 lxc_container_put(c
);
3394 if (names
&& *names
) {
3395 for (i
=0; i
<cfound
; i
++)
3399 if (cret
&& *cret
) {
3400 for (i
=0; i
<nfound
; i
++)
3401 lxc_container_put((*cret
)[i
]);
3408 int list_active_containers(const char *lxcpath
, char ***nret
,
3409 struct lxc_container
***cret
)
3411 int i
, ret
= -1, cret_cnt
= 0, ct_name_cnt
= 0;
3414 char **ct_name
= NULL
;
3416 struct lxc_container
*c
;
3419 lxcpath
= lxc_global_config_value("lxc.lxcpath");
3420 lxcpath_len
= strlen(lxcpath
);
3427 FILE *f
= fopen("/proc/net/unix", "r");
3431 while (getline(&line
, &len
, f
) != -1) {
3432 char *p
= strrchr(line
, ' '), *p2
;
3439 if (strncmp(p
, lxcpath
, lxcpath_len
) != 0)
3445 // Now p is the start of lxc_name
3447 if (!p2
|| strncmp(p2
, "/command", 8) != 0)
3451 if (array_contains(&ct_name
, p
, ct_name_cnt
))
3454 if (!add_to_array(&ct_name
, p
, ct_name_cnt
))
3455 goto free_cret_list
;
3462 c
= lxc_container_new(p
, lxcpath
);
3464 INFO("Container %s:%s is running but could not be loaded",
3466 remove_from_array(&ct_name
, p
, ct_name_cnt
--);
3471 * If this is an anonymous container, then is_defined *can*
3472 * return false. So we don't do that check. Count on the
3473 * fact that the command socket exists.
3476 if (!add_to_clist(cret
, c
, cret_cnt
, true)) {
3477 lxc_container_put(c
);
3478 goto free_cret_list
;
3483 assert(!nret
|| !cret
|| cret_cnt
== ct_name_cnt
);
3492 if (cret
&& *cret
) {
3493 for (i
= 0; i
< cret_cnt
; i
++)
3494 lxc_container_put((*cret
)[i
]);
3500 for (i
= 0; i
< ct_name_cnt
; i
++)
3513 int list_all_containers(const char *lxcpath
, char ***nret
,
3514 struct lxc_container
***cret
)
3516 int i
, ret
, active_cnt
, ct_cnt
, ct_list_cnt
;
3519 struct lxc_container
**ct_list
= NULL
;
3521 ct_cnt
= list_defined_containers(lxcpath
, &ct_name
, NULL
);
3525 active_cnt
= list_active_containers(lxcpath
, &active_name
, NULL
);
3526 if (active_cnt
< 0) {
3531 for (i
= 0; i
< active_cnt
; i
++) {
3532 if (!array_contains(&ct_name
, active_name
[i
], ct_cnt
)) {
3533 if (!add_to_array(&ct_name
, active_name
[i
], ct_cnt
)) {
3535 goto free_active_name
;
3539 free(active_name
[i
]);
3540 active_name
[i
] = NULL
;
3546 for (i
= 0, ct_list_cnt
= 0; i
< ct_cnt
&& cret
; i
++) {
3547 struct lxc_container
*c
;
3549 c
= lxc_container_new(ct_name
[i
], lxcpath
);
3551 WARN("Container %s:%s could not be loaded", lxcpath
, ct_name
[i
]);
3552 remove_from_array(&ct_name
, ct_name
[i
], ct_cnt
--);
3556 if (!add_to_clist(&ct_list
, c
, ct_list_cnt
, false)) {
3557 lxc_container_put(c
);
3576 for (i
= 0; i
< ct_list_cnt
; i
++) {
3577 lxc_container_put(ct_list
[i
]);
3583 for (i
= 0; i
< active_cnt
; i
++) {
3585 free(active_name
[i
]);
3591 for (i
= 0; i
< ct_cnt
; i
++) {