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
24 #include <arpa/inet.h>
38 #include <sys/mount.h>
40 #include <sys/syscall.h>
41 #include <sys/sysmacros.h>
42 #include <sys/types.h>
46 #include "../include/netns_ifaddrs.h"
48 #include "api_extensions.h"
52 #include "commands_utils.h"
56 #include "confile_utils.h"
59 #include "initutils.h"
62 #include "lxccontainer.h"
65 #include "namespace.h"
68 #include "raw_syscalls.h"
72 #include "storage/btrfs.h"
73 #include "storage/overlay.h"
74 #include "storage_utils.h"
76 #include "syscall_wrappers.h"
83 #include <sys/mkdev.h>
87 #include <../include/lxcmntent.h>
93 #include "include/strlcpy.h"
96 /* Define faccessat() if missing from the C library */
97 #ifndef HAVE_FACCESSAT
98 static int faccessat(int __fd
, const char *__file
, int __type
, int __flag
)
100 #ifdef __NR_faccessat
101 return syscall(__NR_faccessat
, __fd
, __file
, __type
, __flag
);
109 lxc_log_define(lxccontainer
, lxc
);
111 static bool do_lxcapi_destroy(struct lxc_container
*c
);
112 static const char *lxcapi_get_config_path(struct lxc_container
*c
);
113 #define do_lxcapi_get_config_path(c) lxcapi_get_config_path(c)
114 static bool do_lxcapi_set_config_item(struct lxc_container
*c
, const char *key
, const char *v
);
115 static bool container_destroy(struct lxc_container
*c
,
116 struct lxc_storage
*storage
);
117 static bool get_snappath_dir(struct lxc_container
*c
, char *snappath
);
118 static bool lxcapi_snapshot_destroy_all(struct lxc_container
*c
);
119 static bool do_lxcapi_save_config(struct lxc_container
*c
, const char *alt_file
);
121 static bool config_file_exists(const char *lxcpath
, const char *cname
)
127 /* $lxcpath + '/' + $cname + '/config' + \0 */
128 len
= strlen(lxcpath
) + strlen(cname
) + 9;
130 ret
= snprintf(fname
, len
, "%s/%s/config", lxcpath
, cname
);
131 if (ret
< 0 || (size_t)ret
>= len
)
134 return file_exists(fname
);
137 /* A few functions to help detect when a container creation failed. If a
138 * container creation was killed partway through, then trying to actually start
139 * that container could harm the host. We detect this by creating a 'partial'
140 * file under the container directory, and keeping an advisory lock. When
141 * container creation completes, we remove that file. When we load or try to
142 * start a container, if we find that file, without a flock, we remove the
145 static int ongoing_create(struct lxc_container
*c
)
150 struct flock lk
= {0};
152 len
= strlen(c
->config_path
) + strlen(c
->name
) + 10;
154 ret
= snprintf(path
, len
, "%s/%s/partial", c
->config_path
, c
->name
);
155 if (ret
< 0 || (size_t)ret
>= len
)
158 fd
= open(path
, O_RDWR
| O_CLOEXEC
);
167 lk
.l_whence
= SEEK_SET
;
168 /* F_OFD_GETLK requires that l_pid be set to 0 otherwise the kernel
173 ret
= fcntl(fd
, F_OFD_GETLK
, &lk
);
174 if (ret
< 0 && errno
== EINVAL
) {
175 ret
= flock(fd
, LOCK_EX
| LOCK_NB
);
176 if (ret
< 0 && errno
== EWOULDBLOCK
)
182 /* F_OFD_GETLK will not send us back a pid so don't check it. */
184 /* Create is still ongoing. */
187 /* Create completed but partial is still there. */
191 static int create_partial(struct lxc_container
*c
)
196 struct flock lk
= {0};
198 /* $lxcpath + '/' + $name + '/partial' + \0 */
199 len
= strlen(c
->config_path
) + strlen(c
->name
) + 10;
201 ret
= snprintf(path
, len
, "%s/%s/partial", c
->config_path
, c
->name
);
202 if (ret
< 0 || (size_t)ret
>= len
)
205 fd
= open(path
, O_RDWR
| O_CREAT
| O_EXCL
| O_CLOEXEC
, 0000);
210 lk
.l_whence
= SEEK_SET
;
212 ret
= fcntl(fd
, F_OFD_SETLKW
, &lk
);
214 if (errno
== EINVAL
) {
215 ret
= flock(fd
, LOCK_EX
);
220 SYSERROR("Failed to lock partial file %s", path
);
228 static void remove_partial(struct lxc_container
*c
, int fd
)
236 /* $lxcpath + '/' + $name + '/partial' + \0 */
237 len
= strlen(c
->config_path
) + strlen(c
->name
) + 10;
239 ret
= snprintf(path
, len
, "%s/%s/partial", c
->config_path
, c
->name
);
240 if (ret
< 0 || (size_t)ret
>= len
)
245 SYSERROR("Failed to remove partial file %s", path
);
249 * 1. container_mem_lock(c) protects the struct lxc_container from multiple threads.
250 * 2. container_disk_lock(c) protects the on-disk container data - in particular the
251 * container configuration file.
252 * The container_disk_lock also takes the container_mem_lock.
253 * 3. thread_mutex protects process data (ex: fd table) from multiple threads.
254 * NOTHING mutexes two independent programs with their own struct
255 * lxc_container for the same c->name, between API calls. For instance,
256 * c->config_read(); c->start(); Between those calls, data on disk
257 * could change (which shouldn't bother the caller unless for instance
258 * the rootfs get moved). c->config_read(); update; c->config_write();
259 * Two such updaters could race. The callers should therefore check their
260 * results. Trying to prevent that would necessarily expose us to deadlocks
261 * due to hung callers. So I prefer to keep the locks only within our own
262 * functions, not across functions.
264 * If you're going to clone while holding a lxccontainer, increment
265 * c->numthreads (under privlock) before forking. When deleting,
266 * decrement numthreads under privlock, then if it hits 0 you can delete.
267 * Do not ever use a lxccontainer whose numthreads you did not bump.
269 static void lxc_container_free(struct lxc_container
*c
)
275 c
->configfile
= NULL
;
277 free(c
->error_string
);
278 c
->error_string
= NULL
;
281 lxc_putlock(c
->slock
);
286 lxc_putlock(c
->privlock
);
294 lxc_conf_free(c
->lxc_conf
);
298 free(c
->config_path
);
299 c
->config_path
= NULL
;
304 /* Consider the following case:
306 * |====================================================================|
307 * | freer | racing get()er |
308 * |====================================================================|
309 * | lxc_container_put() | lxc_container_get() |
310 * | \ lxclock(c->privlock) | c->numthreads < 1? (no) |
311 * | \ c->numthreads = 0 | \ lxclock(c->privlock) -> waits |
312 * | \ lxcunlock() | \ |
313 * | \ lxc_container_free() | \ lxclock() returns |
314 * | | \ c->numthreads < 1 -> return 0 |
315 * | \ \ (free stuff) | |
316 * | \ \ sem_destroy(privlock) | |
317 * |_______________________________|____________________________________|
319 * When the get()er checks numthreads the first time, one of the following
321 * 1. freer has set numthreads = 0. get() returns 0
322 * 2. freer is between lxclock and setting numthreads to 0. get()er will
323 * sem_wait on privlock, get lxclock after freer() drops it, then see
324 * numthreads is 0 and exit without touching lxclock again..
325 * 3. freer has not yet locked privlock. If get()er runs first, then put()er
326 * will see --numthreads = 1 and not call lxc_container_free().
329 int lxc_container_get(struct lxc_container
*c
)
334 /* If someone else has already started freeing the container, don't try
335 * to take the lock, which may be invalid.
337 if (c
->numthreads
< 1)
340 if (container_mem_lock(c
))
343 /* Bail without trying to unlock, bc the privlock is now probably in
346 if (c
->numthreads
< 1)
350 container_mem_unlock(c
);
355 int lxc_container_put(struct lxc_container
*c
)
360 if (container_mem_lock(c
))
365 if (c
->numthreads
< 1) {
366 container_mem_unlock(c
);
367 lxc_container_free(c
);
371 container_mem_unlock(c
);
375 static bool do_lxcapi_is_defined(struct lxc_container
*c
)
384 if (container_mem_lock(c
))
390 statret
= stat(c
->configfile
, &statbuf
);
397 container_mem_unlock(c
);
401 #define WRAP_API(rettype, fnname) \
402 static rettype fnname(struct lxc_container *c) \
405 bool reset_config = false; \
407 if (!current_config && c && c->lxc_conf) { \
408 current_config = c->lxc_conf; \
409 reset_config = true; \
412 ret = do_##fnname(c); \
414 current_config = NULL; \
419 #define WRAP_API_1(rettype, fnname, t1) \
420 static rettype fnname(struct lxc_container *c, t1 a1) \
423 bool reset_config = false; \
425 if (!current_config && c && c->lxc_conf) { \
426 current_config = c->lxc_conf; \
427 reset_config = true; \
430 ret = do_##fnname(c, a1); \
432 current_config = NULL; \
437 #define WRAP_API_2(rettype, fnname, t1, t2) \
438 static rettype fnname(struct lxc_container *c, t1 a1, t2 a2) \
441 bool reset_config = false; \
443 if (!current_config && c && c->lxc_conf) { \
444 current_config = c->lxc_conf; \
445 reset_config = true; \
448 ret = do_##fnname(c, a1, a2); \
450 current_config = NULL; \
455 #define WRAP_API_3(rettype, fnname, t1, t2, t3) \
456 static rettype fnname(struct lxc_container *c, t1 a1, t2 a2, t3 a3) \
459 bool reset_config = false; \
461 if (!current_config && c && c->lxc_conf) { \
462 current_config = c->lxc_conf; \
463 reset_config = true; \
466 ret = do_##fnname(c, a1, a2, a3); \
468 current_config = NULL; \
473 #define WRAP_API_6(rettype, fnname, t1, t2, t3, t4, t5, t6) \
474 static rettype fnname(struct lxc_container *c, t1 a1, t2 a2, t3 a3, \
475 t4 a4, t5 a5, t6 a6) \
478 bool reset_config = false; \
480 if (!current_config && c && c->lxc_conf) { \
481 current_config = c->lxc_conf; \
482 reset_config = true; \
485 ret = do_##fnname(c, a1, a2, a3, a4, a5, a6); \
487 current_config = NULL; \
492 WRAP_API(bool, lxcapi_is_defined
)
494 static const char *do_lxcapi_state(struct lxc_container
*c
)
501 s
= lxc_getstate(c
->name
, c
->config_path
);
502 return lxc_state2str(s
);
505 WRAP_API(const char *, lxcapi_state
)
507 static bool is_stopped(struct lxc_container
*c
)
511 s
= lxc_getstate(c
->name
, c
->config_path
);
512 return (s
== STOPPED
);
515 static bool do_lxcapi_is_running(struct lxc_container
*c
)
520 return !is_stopped(c
);
523 WRAP_API(bool, lxcapi_is_running
)
525 static bool do_lxcapi_freeze(struct lxc_container
*c
)
532 ret
= lxc_freeze(c
->lxc_conf
, c
->name
, c
->config_path
);
539 WRAP_API(bool, lxcapi_freeze
)
541 static bool do_lxcapi_unfreeze(struct lxc_container
*c
)
548 ret
= lxc_unfreeze(c
->lxc_conf
, c
->name
, c
->config_path
);
555 WRAP_API(bool, lxcapi_unfreeze
)
557 static int do_lxcapi_console_getfd(struct lxc_container
*c
, int *ttynum
, int *masterfd
)
562 return lxc_terminal_getfd(c
, ttynum
, masterfd
);
565 WRAP_API_2(int, lxcapi_console_getfd
, int *, int *)
567 static int lxcapi_console(struct lxc_container
*c
, int ttynum
, int stdinfd
,
568 int stdoutfd
, int stderrfd
, int escape
)
575 current_config
= c
->lxc_conf
;
576 ret
= lxc_console(c
, ttynum
, stdinfd
, stdoutfd
, stderrfd
, escape
);
577 current_config
= NULL
;
582 static int do_lxcapi_console_log(struct lxc_container
*c
, struct lxc_console_log
*log
)
589 ret
= lxc_cmd_console_log(c
->name
, do_lxcapi_get_config_path(c
), log
);
592 NOTICE("The console log is empty");
593 else if (ret
== -EFAULT
)
594 NOTICE("The container does not keep a console log");
595 else if (ret
== -ENOENT
)
596 NOTICE("The container does not keep a console log file");
597 else if (ret
== -EIO
)
598 NOTICE("Failed to write console log to log file");
600 ERROR("Failed to retrieve console log");
606 WRAP_API_1(int, lxcapi_console_log
, struct lxc_console_log
*)
608 static pid_t
do_lxcapi_init_pid(struct lxc_container
*c
)
613 return lxc_cmd_get_init_pid(c
->name
, c
->config_path
);
616 WRAP_API(pid_t
, lxcapi_init_pid
)
618 static bool load_config_locked(struct lxc_container
*c
, const char *fname
)
621 c
->lxc_conf
= lxc_conf_init();
626 if (lxc_config_read(fname
, c
->lxc_conf
, false) != 0)
629 c
->lxc_conf
->name
= c
->name
;
633 static bool do_lxcapi_load_config(struct lxc_container
*c
, const char *alt_file
)
637 bool need_disklock
= false, ret
= false;
642 fname
= c
->configfile
;
650 /* If we're reading something other than the container's config, we only
651 * need to lock the in-memory container. If loading the container's
652 * config file, take the disk lock.
654 if (strcmp(fname
, c
->configfile
) == 0)
655 need_disklock
= true;
658 lret
= container_disk_lock(c
);
660 lret
= container_mem_lock(c
);
664 ret
= load_config_locked(c
, fname
);
667 container_disk_unlock(c
);
669 container_mem_unlock(c
);
674 WRAP_API_1(bool, lxcapi_load_config
, const char *)
676 static bool do_lxcapi_want_daemonize(struct lxc_container
*c
, bool state
)
678 if (!c
|| !c
->lxc_conf
)
681 if (container_mem_lock(c
))
684 c
->daemonize
= state
;
686 container_mem_unlock(c
);
691 WRAP_API_1(bool, lxcapi_want_daemonize
, bool)
693 static bool do_lxcapi_want_close_all_fds(struct lxc_container
*c
, bool state
)
695 if (!c
|| !c
->lxc_conf
)
698 if (container_mem_lock(c
))
701 c
->lxc_conf
->close_all_fds
= state
;
703 container_mem_unlock(c
);
708 WRAP_API_1(bool, lxcapi_want_close_all_fds
, bool)
710 static bool do_lxcapi_wait(struct lxc_container
*c
, const char *state
,
718 ret
= lxc_wait(c
->name
, state
, timeout
, c
->config_path
);
722 WRAP_API_2(bool, lxcapi_wait
, const char *, int)
724 static bool am_single_threaded(void)
727 struct dirent
*direntp
;
730 dir
= opendir("/proc/self/task");
734 while ((direntp
= readdir(dir
))) {
735 if (strcmp(direntp
->d_name
, ".") == 0)
738 if (strcmp(direntp
->d_name
, "..") == 0)
750 static void push_arg(char ***argp
, char *arg
, int *nargs
)
755 copy
= must_copy_string(arg
);
758 argv
= realloc(*argp
, (*nargs
+ 2) * sizeof(char *));
767 static char **split_init_cmd(const char *incmd
)
777 len
= strlen(incmd
) + 1;
779 retlen
= strlcpy(copy
, incmd
, len
);
784 argv
= malloc(sizeof(char *));
788 lxc_iterate_parts(p
, copy
, " ")
789 push_arg(&argv
, p
, &nargs
);
799 static void free_init_cmd(char **argv
)
812 static int lxc_rcv_status(int state_socket
)
818 /* Receive container state. */
819 ret
= lxc_abstract_unix_rcv_credential(state_socket
, &state
, sizeof(int));
824 TRACE("Caught EINTR; retrying");
831 static bool wait_on_daemonized_start(struct lxc_handler
*handler
, int pid
)
835 /* Close write end of the socket pair. */
836 close(handler
->state_socket_pair
[1]);
837 handler
->state_socket_pair
[1] = -1;
839 state
= lxc_rcv_status(handler
->state_socket_pair
[0]);
841 /* Close read end of the socket pair. */
842 close(handler
->state_socket_pair
[0]);
843 handler
->state_socket_pair
[0] = -1;
845 /* The first child is going to fork() again and then exits. So we reap
846 * the first child here.
848 ret
= wait_for_pid(pid
);
850 DEBUG("Failed waiting on first child %d", pid
);
852 DEBUG("First child %d exited", pid
);
855 SYSERROR("Failed to receive the container state");
859 /* If we receive anything else then running we know that the container
862 if (state
!= RUNNING
) {
863 ERROR("Received container state \"%s\" instead of \"RUNNING\"",
864 lxc_state2str(state
));
868 TRACE("Container is in \"RUNNING\" state");
872 static bool do_lxcapi_start(struct lxc_container
*c
, int useinit
, char * const argv
[])
875 struct lxc_handler
*handler
;
876 struct lxc_conf
*conf
;
877 char *default_args
[] = {
881 char **init_cmd
= NULL
;
882 int keepfds
[3] = {-1, -1, -1};
884 /* container does exist */
888 /* If anything fails before we set error_num, we want an error in there.
892 /* Container has not been setup. */
896 ret
= ongoing_create(c
);
898 ERROR("Failed checking for incomplete container creation");
900 } else if (ret
== 1) {
901 ERROR("Ongoing container creation detected");
903 } else if (ret
== 2) {
904 ERROR("Failed to create container");
905 do_lxcapi_destroy(c
);
909 if (container_mem_lock(c
))
914 /* initialize handler */
915 handler
= lxc_init_handler(c
->name
, conf
, c
->config_path
, c
->daemonize
);
917 container_mem_unlock(c
);
922 if (useinit
&& conf
->execute_cmd
)
923 argv
= init_cmd
= split_init_cmd(conf
->execute_cmd
);
925 argv
= init_cmd
= split_init_cmd(conf
->init_cmd
);
928 /* ... otherwise use default_args. */
931 ERROR("No valid init detected");
932 lxc_free_handler(handler
);
938 /* I'm not sure what locks we want here.Any? Is liblxc's locking enough
939 * here to protect the on disk container? We don't want to exclude
940 * things like lxc_info while the container is running.
949 free_init_cmd(init_cmd
);
950 lxc_free_handler(handler
);
956 /* Set to NULL because we don't want father unlink
957 * the PID file, child will do the free and unlink.
961 /* Wait for container to tell us whether it started
964 started
= wait_on_daemonized_start(handler
, pid
);
966 free_init_cmd(init_cmd
);
967 lxc_free_handler(handler
);
973 /* We don't really care if this doesn't print all the
974 * characters. All that it means is that the proctitle will be
975 * ugly. Similarly, we also don't care if setproctitle() fails.
977 ret
= snprintf(title
, sizeof(title
), "[lxc monitor] %s %s", c
->config_path
, c
->name
);
979 ret
= setproctitle(title
);
981 INFO("Failed to set process title to %s", title
);
983 INFO("Set process title to %s", title
);
986 /* We fork() a second time to be reparented to init. Like
987 * POSIX's daemon() function we change to "/" and redirect
988 * std{in,out,err} to /dev/null.
992 SYSERROR("Failed to fork first child process");
998 free_init_cmd(init_cmd
);
999 lxc_free_handler(handler
);
1000 _exit(EXIT_SUCCESS
);
1005 /* change to / directory */
1008 SYSERROR("Failed to change to \"/\" directory");
1009 _exit(EXIT_FAILURE
);
1012 keepfds
[0] = handler
->conf
->maincmd_fd
;
1013 keepfds
[1] = handler
->state_socket_pair
[0];
1014 keepfds
[2] = handler
->state_socket_pair
[1];
1015 ret
= lxc_check_inherited(conf
, true, keepfds
,
1016 sizeof(keepfds
) / sizeof(keepfds
[0]));
1018 _exit(EXIT_FAILURE
);
1020 /* redirect std{in,out,err} to /dev/null */
1021 ret
= null_stdfds();
1023 ERROR("Failed to redirect std{in,out,err} to /dev/null");
1024 _exit(EXIT_FAILURE
);
1027 /* become session leader */
1030 TRACE("Process %d is already process group leader", lxc_raw_getpid());
1031 } else if (!am_single_threaded()) {
1032 ERROR("Cannot start non-daemonized container when threaded");
1033 free_init_cmd(init_cmd
);
1034 lxc_free_handler(handler
);
1038 /* We need to write PID file after daemonize, so we always write the
1043 char pidstr
[INTTYPE_TO_STRLEN(pid_t
)];
1045 w
= snprintf(pidstr
, sizeof(pidstr
), "%d", lxc_raw_getpid());
1046 if (w
< 0 || (size_t)w
>= sizeof(pidstr
)) {
1047 free_init_cmd(init_cmd
);
1048 lxc_free_handler(handler
);
1050 SYSERROR("Failed to write monitor pid to \"%s\"", c
->pidfile
);
1053 _exit(EXIT_FAILURE
);
1058 ret
= lxc_write_to_file(c
->pidfile
, pidstr
, w
, false, 0600);
1060 free_init_cmd(init_cmd
);
1061 lxc_free_handler(handler
);
1063 SYSERROR("Failed to write monitor pid to \"%s\"", c
->pidfile
);
1066 _exit(EXIT_FAILURE
);
1072 conf
->reboot
= REBOOT_NONE
;
1074 /* Unshare the mount namespace if requested */
1075 if (conf
->monitor_unshare
) {
1076 ret
= unshare(CLONE_NEWNS
);
1078 SYSERROR("Failed to unshare mount namespace");
1079 lxc_free_handler(handler
);
1084 ret
= mount(NULL
, "/", NULL
, MS_SLAVE
|MS_REC
, NULL
);
1086 SYSERROR("Failed to make / rslave at startup");
1087 lxc_free_handler(handler
);
1094 if (conf
->reboot
== REBOOT_INIT
) {
1095 /* initialize handler */
1096 handler
= lxc_init_handler(c
->name
, conf
, c
->config_path
, c
->daemonize
);
1103 keepfds
[0] = handler
->conf
->maincmd_fd
;
1104 keepfds
[1] = handler
->state_socket_pair
[0];
1105 keepfds
[2] = handler
->state_socket_pair
[1];
1106 ret
= lxc_check_inherited(conf
, c
->daemonize
, keepfds
,
1107 sizeof(keepfds
) / sizeof(keepfds
[0]));
1109 lxc_free_handler(handler
);
1115 ret
= lxc_execute(c
->name
, argv
, 1, handler
, c
->config_path
,
1116 c
->daemonize
, &c
->error_num
);
1118 ret
= lxc_start(c
->name
, argv
, handler
, c
->config_path
,
1119 c
->daemonize
, &c
->error_num
);
1121 if (conf
->reboot
== REBOOT_REQ
) {
1122 INFO("Container requested reboot");
1123 conf
->reboot
= REBOOT_INIT
;
1133 free_init_cmd(init_cmd
);
1135 if (c
->daemonize
&& ret
!= 0)
1136 _exit(EXIT_FAILURE
);
1137 else if (c
->daemonize
)
1138 _exit(EXIT_SUCCESS
);
1146 static bool lxcapi_start(struct lxc_container
*c
, int useinit
,
1151 current_config
= c
? c
->lxc_conf
: NULL
;
1152 ret
= do_lxcapi_start(c
, useinit
, argv
);
1153 current_config
= NULL
;
1158 /* Note, there MUST be an ending NULL. */
1159 static bool lxcapi_startl(struct lxc_container
*c
, int useinit
, ...)
1162 char **inargs
= NULL
;
1165 /* container exists */
1169 current_config
= c
->lxc_conf
;
1171 va_start(ap
, useinit
);
1172 inargs
= lxc_va_arg_list_to_argv(ap
, 0, 1);
1177 /* pass NULL if no arguments were supplied */
1178 bret
= do_lxcapi_start(c
, useinit
, *inargs
? inargs
: NULL
);
1184 for (arg
= inargs
; *arg
; arg
++)
1189 current_config
= NULL
;
1194 static bool do_lxcapi_stop(struct lxc_container
*c
)
1201 ret
= lxc_cmd_stop(c
->name
, c
->config_path
);
1206 WRAP_API(bool, lxcapi_stop
)
1208 static int do_create_container_dir(const char *path
, struct lxc_conf
*conf
)
1215 mode_t mask
= umask(0002);
1216 ret
= mkdir(path
, 0770);
1221 if (errno
!= EEXIST
)
1228 p
= alloca(len
+ 1);
1229 (void)strlcpy(p
, path
, len
+ 1);
1231 if (!lxc_list_empty(&conf
->id_map
)) {
1232 ret
= chown_mapped_root(p
, conf
);
1240 /* Create the standard expected container dir. */
1241 static bool create_container_dir(struct lxc_container
*c
)
1247 len
= strlen(c
->config_path
) + strlen(c
->name
) + 2;
1252 ret
= snprintf(s
, len
, "%s/%s", c
->config_path
, c
->name
);
1253 if (ret
< 0 || (size_t)ret
>= len
) {
1258 ret
= do_create_container_dir(s
, c
->lxc_conf
);
1264 /* do_storage_create: thin wrapper around storage_create(). Like
1265 * storage_create(), it returns a mounted bdev on success, NULL on error.
1267 static struct lxc_storage
*do_storage_create(struct lxc_container
*c
,
1269 struct bdev_specs
*specs
)
1274 struct lxc_storage
*bdev
;
1276 /* rootfs.path or lxcpath/lxcname/rootfs */
1277 if (c
->lxc_conf
->rootfs
.path
&&
1278 (access(c
->lxc_conf
->rootfs
.path
, F_OK
) == 0)) {
1279 const char *rpath
= c
->lxc_conf
->rootfs
.path
;
1280 len
= strlen(rpath
) + 1;
1282 ret
= snprintf(dest
, len
, "%s", rpath
);
1284 const char *lxcpath
= do_lxcapi_get_config_path(c
);
1285 len
= strlen(c
->name
) + strlen(lxcpath
) + 9;
1287 ret
= snprintf(dest
, len
, "%s/%s/rootfs", lxcpath
, c
->name
);
1289 if (ret
< 0 || (size_t)ret
>= len
)
1292 bdev
= storage_create(dest
, type
, c
->name
, specs
);
1294 ERROR("Failed to create \"%s\" storage", type
);
1298 if (!c
->set_config_item(c
, "lxc.rootfs.path", bdev
->src
)) {
1299 ERROR("Failed to set \"lxc.rootfs.path = %s\"", bdev
->src
);
1303 /* If we are not root, chown the rootfs dir to root in the target user
1307 if (ret
!= 0 || (c
->lxc_conf
&& !lxc_list_empty(&c
->lxc_conf
->id_map
))) {
1308 ret
= chown_mapped_root(bdev
->dest
, c
->lxc_conf
);
1310 ERROR("Error chowning \"%s\" to container root", bdev
->dest
);
1311 suggest_default_idmap();
1320 static char *lxcbasename(char *path
)
1324 p
= path
+ strlen(path
) - 1;
1325 while (*p
!= '/' && p
> path
)
1331 static bool create_run_template(struct lxc_container
*c
, char *tpath
,
1332 bool need_null_stdfds
, char *const argv
[])
1342 SYSERROR("Failed to fork task for container creation template");
1346 if (pid
== 0) { /* child */
1348 char *namearg
, *patharg
, *rootfsarg
;
1351 struct lxc_storage
*bdev
= NULL
;
1352 struct lxc_conf
*conf
= c
->lxc_conf
;
1355 if (need_null_stdfds
) {
1356 ret
= null_stdfds();
1358 _exit(EXIT_FAILURE
);
1361 bdev
= storage_init(c
->lxc_conf
);
1363 ERROR("Failed to initialize storage");
1364 _exit(EXIT_FAILURE
);
1369 ret
= unshare(CLONE_NEWNS
);
1371 ERROR("Failed to unshare CLONE_NEWNS");
1372 _exit(EXIT_FAILURE
);
1375 ret
= detect_shared_rootfs();
1377 ret
= mount(NULL
, "/", NULL
, MS_SLAVE
| MS_REC
, NULL
);
1379 SYSERROR("Failed to make \"/\" rslave");
1380 ERROR("Continuing...");
1385 if (strcmp(bdev
->type
, "dir") != 0 && strcmp(bdev
->type
, "btrfs") != 0) {
1387 ERROR("Unprivileged users can only create "
1388 "btrfs and directory-backed containers");
1389 _exit(EXIT_FAILURE
);
1392 if (strcmp(bdev
->type
, "overlay") == 0 ||
1393 strcmp(bdev
->type
, "overlayfs") == 0) {
1394 /* If we create an overlay container we need to
1395 * rsync the contents into
1396 * <container-path>/<container-name>/rootfs.
1397 * However, the overlay mount function will
1399 * <container-path>/<container-name>/delta0
1401 * <container-path>/<container-name>/rootfs
1402 * which means we would rsync the rootfs into
1403 * the delta directory. That doesn't make sense
1404 * since the delta directory only exists to
1405 * record the differences to
1406 * <container-path>/<container-name>/rootfs. So
1407 * let's simply bind-mount here and then rsync
1409 * <container-path>/<container-name>/rootfs.
1413 src
= ovl_get_rootfs(bdev
->src
, &(size_t){0});
1415 ERROR("Failed to get rootfs");
1416 _exit(EXIT_FAILURE
);
1419 ret
= mount(src
, bdev
->dest
, "bind", MS_BIND
| MS_REC
, NULL
);
1421 ERROR("Failed to mount rootfs");
1422 _exit(EXIT_FAILURE
);
1425 ret
= bdev
->ops
->mount(bdev
);
1427 ERROR("Failed to mount rootfs");
1428 _exit(EXIT_FAILURE
);
1431 } else { /* TODO come up with a better way here! */
1434 src
= lxc_storage_get_path(bdev
->src
, bdev
->type
);
1435 bdev
->dest
= strdup(src
);
1438 /* Create our new array, pre-pend the template name and base
1442 for (nargs
= 0; argv
[nargs
]; nargs
++)
1445 /* template, path, rootfs and name args */
1448 newargv
= malloc(nargs
* sizeof(*newargv
));
1450 _exit(EXIT_FAILURE
);
1451 newargv
[0] = lxcbasename(tpath
);
1454 len
= strlen(c
->config_path
) + strlen(c
->name
) + strlen("--path=") + 2;
1455 patharg
= malloc(len
);
1457 _exit(EXIT_FAILURE
);
1459 ret
= snprintf(patharg
, len
, "--path=%s/%s", c
->config_path
, c
->name
);
1460 if (ret
< 0 || ret
>= len
)
1461 _exit(EXIT_FAILURE
);
1462 newargv
[1] = patharg
;
1465 len
= strlen("--name=") + strlen(c
->name
) + 1;
1466 namearg
= malloc(len
);
1468 _exit(EXIT_FAILURE
);
1470 ret
= snprintf(namearg
, len
, "--name=%s", c
->name
);
1471 if (ret
< 0 || ret
>= len
)
1472 _exit(EXIT_FAILURE
);
1473 newargv
[2] = namearg
;
1476 len
= strlen("--rootfs=") + 1 + strlen(bdev
->dest
);
1477 rootfsarg
= malloc(len
);
1479 _exit(EXIT_FAILURE
);
1481 ret
= snprintf(rootfsarg
, len
, "--rootfs=%s", bdev
->dest
);
1482 if (ret
< 0 || ret
>= len
)
1483 _exit(EXIT_FAILURE
);
1484 newargv
[3] = rootfsarg
;
1486 /* add passed-in args */
1488 for (i
= 4; i
< nargs
; i
++)
1489 newargv
[i
] = argv
[i
- 4];
1491 /* add trailing NULL */
1493 newargv
= realloc(newargv
, nargs
* sizeof(*newargv
));
1495 _exit(EXIT_FAILURE
);
1496 newargv
[nargs
- 1] = NULL
;
1498 /* If we're running the template in a mapped userns, then we
1499 * prepend the template command with: lxc-usernsexec <-m map1>
1500 * ... <-m mapn> -- and we append "--mapped-uid x", where x is
1501 * the mapped uid for our geteuid()
1503 if (!lxc_list_empty(&conf
->id_map
)) {
1504 int extraargs
, hostuid_mapped
, hostgid_mapped
;
1506 char txtuid
[20], txtgid
[20];
1507 struct lxc_list
*it
;
1511 n2
= malloc(n2args
* sizeof(*n2
));
1513 _exit(EXIT_FAILURE
);
1516 tpath
= "lxc-usernsexec";
1517 n2
[0] = "lxc-usernsexec";
1519 lxc_list_for_each(it
, &conf
->id_map
) {
1522 n2
= realloc(n2
, n2args
* sizeof(char *));
1524 _exit(EXIT_FAILURE
);
1526 n2
[n2args
- 2] = "-m";
1527 n2
[n2args
- 1] = malloc(200);
1528 if (!n2
[n2args
- 1])
1529 _exit(EXIT_FAILURE
);
1531 ret
= snprintf(n2
[n2args
- 1], 200, "%c:%lu:%lu:%lu",
1532 map
->idtype
== ID_TYPE_UID
? 'u' : 'g',
1533 map
->nsid
, map
->hostid
, map
->range
);
1534 if (ret
< 0 || ret
>= 200)
1535 _exit(EXIT_FAILURE
);
1538 hostuid_mapped
= mapped_hostid(geteuid(), conf
, ID_TYPE_UID
);
1539 extraargs
= hostuid_mapped
>= 0 ? 1 : 3;
1541 n2
= realloc(n2
, (nargs
+ n2args
+ extraargs
) * sizeof(char *));
1543 _exit(EXIT_FAILURE
);
1545 if (hostuid_mapped
< 0) {
1546 hostuid_mapped
= find_unmapped_nsid(conf
, ID_TYPE_UID
);
1547 n2
[n2args
++] = "-m";
1548 if (hostuid_mapped
< 0) {
1549 ERROR("Failed to find free uid to map");
1550 _exit(EXIT_FAILURE
);
1553 n2
[n2args
++] = malloc(200);
1554 if (!n2
[n2args
- 1]) {
1555 SYSERROR("out of memory");
1556 _exit(EXIT_FAILURE
);
1559 ret
= snprintf(n2
[n2args
- 1], 200, "u:%d:%d:1",
1560 hostuid_mapped
, geteuid());
1561 if (ret
< 0 || ret
>= 200)
1562 _exit(EXIT_FAILURE
);
1565 hostgid_mapped
= mapped_hostid(getegid(), conf
, ID_TYPE_GID
);
1566 extraargs
= hostgid_mapped
>= 0 ? 1 : 3;
1568 n2
= realloc(n2
, (nargs
+ n2args
+ extraargs
) * sizeof(char *));
1570 _exit(EXIT_FAILURE
);
1572 if (hostgid_mapped
< 0) {
1573 hostgid_mapped
= find_unmapped_nsid(conf
, ID_TYPE_GID
);
1574 n2
[n2args
++] = "-m";
1575 if (hostgid_mapped
< 0) {
1576 ERROR("Failed to find free gid to map");
1577 _exit(EXIT_FAILURE
);
1580 n2
[n2args
++] = malloc(200);
1581 if (!n2
[n2args
- 1]) {
1582 SYSERROR("out of memory");
1583 _exit(EXIT_FAILURE
);
1586 ret
= snprintf(n2
[n2args
- 1], 200, "g:%d:%d:1",
1587 hostgid_mapped
, getegid());
1588 if (ret
< 0 || ret
>= 200)
1589 _exit(EXIT_FAILURE
);
1592 n2
[n2args
++] = "--";
1594 for (i
= 0; i
< nargs
; i
++)
1595 n2
[i
+ n2args
] = newargv
[i
];
1598 /* Finally add "--mapped-uid $uid" to tell template what
1599 * to chown cached images to.
1602 n2
= realloc(n2
, n2args
* sizeof(char *));
1604 _exit(EXIT_FAILURE
);
1606 /* note n2[n2args-1] is NULL */
1607 n2
[n2args
- 5] = "--mapped-uid";
1609 ret
= snprintf(txtuid
, 20, "%d", hostuid_mapped
);
1610 if (ret
< 0 || ret
>= 20) {
1613 _exit(EXIT_FAILURE
);
1616 n2
[n2args
- 4] = txtuid
;
1617 n2
[n2args
- 3] = "--mapped-gid";
1619 ret
= snprintf(txtgid
, 20, "%d", hostgid_mapped
);
1620 if (ret
< 0 || ret
>= 20) {
1623 _exit(EXIT_FAILURE
);
1626 n2
[n2args
- 2] = txtgid
;
1627 n2
[n2args
- 1] = NULL
;
1632 execvp(tpath
, newargv
);
1633 SYSERROR("Failed to execute template %s", tpath
);
1634 _exit(EXIT_FAILURE
);
1637 ret
= wait_for_pid(pid
);
1639 ERROR("Failed to create container from template");
1646 static bool prepend_lxc_header(char *path
, const char *t
, char *const argv
[])
1655 unsigned char md_value
[SHA_DIGEST_LENGTH
];
1659 f
= fopen(path
, "r");
1663 ret
= fseek(f
, 0, SEEK_END
);
1672 ret
= fseek(f
, 0, SEEK_SET
);
1676 ret
= fseek(f
, 0, SEEK_SET
);
1681 contents
= malloc(flen
+ 1);
1685 len
= fread(contents
, 1, flen
, f
);
1687 goto out_free_contents
;
1689 contents
[flen
] = '\0';
1694 goto out_free_contents
;
1697 tpath
= get_template_path(t
);
1699 ERROR("Invalid template \"%s\" specified", t
);
1700 goto out_free_contents
;
1703 ret
= sha1sum_file(tpath
, md_value
);
1705 ERROR("Failed to get sha1sum of %s", tpath
);
1707 goto out_free_contents
;
1712 f
= fopen(path
, "w");
1714 SYSERROR("Reopening config for writing");
1719 fprintf(f
, "# Template used to create this container: %s\n", t
);
1721 fprintf(f
, "# Parameters passed to the template:");
1723 fprintf(f
, " %s", *argv
);
1730 fprintf(f
, "# Template script checksum (SHA-1): ");
1731 for (i
=0; i
<SHA_DIGEST_LENGTH
; i
++)
1732 fprintf(f
, "%02x", md_value
[i
]);
1735 fprintf(f
, "# For additional config options, please look at lxc.container.conf(5)\n");
1736 fprintf(f
, "\n# Uncomment the following line to support nesting containers:\n");
1737 fprintf(f
, "#lxc.include = " LXCTEMPLATECONFIG
"/nesting.conf\n");
1738 fprintf(f
, "# (Be aware this has security implications)\n\n");
1739 if (fwrite(contents
, 1, flen
, f
) != flen
) {
1740 SYSERROR("Writing original contents");
1760 SYSERROR("Error prepending header");
1767 static void lxcapi_clear_config(struct lxc_container
*c
)
1769 if (!c
|| !c
->lxc_conf
)
1772 lxc_conf_free(c
->lxc_conf
);
1776 #define do_lxcapi_clear_config(c) lxcapi_clear_config(c)
1780 * create a container with the given parameters.
1781 * @c: container to be created. It has the lxcpath, name, and a starting
1782 * configuration already set
1783 * @t: the template to execute to instantiate the root filesystem and
1784 * adjust the configuration.
1785 * @bdevtype: backing store type to use. If NULL, dir will be used.
1786 * @specs: additional parameters for the backing store, i.e. LVM vg to
1789 * @argv: the arguments to pass to the template, terminated by NULL. If no
1790 * arguments, you can just pass NULL.
1792 static bool do_lxcapi_create(struct lxc_container
*c
, const char *t
,
1793 const char *bdevtype
, struct bdev_specs
*specs
,
1794 int flags
, char *const argv
[])
1806 tpath
= get_template_path(t
);
1808 ERROR("Unknown template \"%s\"", t
);
1813 /* If a template is passed in, and the rootfs already is defined in the
1814 * container config and exists, then the caller is trying to create an
1815 * existing container. Return an error, but do NOT delete the container.
1817 if (do_lxcapi_is_defined(c
) && c
->lxc_conf
&& c
->lxc_conf
->rootfs
.path
&&
1818 access(c
->lxc_conf
->rootfs
.path
, F_OK
) == 0 && tpath
) {
1819 ERROR("Container \"%s\" already exists in \"%s\"", c
->name
,
1825 if (!do_lxcapi_load_config(c
, lxc_global_config_value("lxc.default_config"))) {
1826 ERROR("Error loading default configuration file %s",
1827 lxc_global_config_value("lxc.default_config"));
1832 if (!create_container_dir(c
))
1835 /* If both template and rootfs.path are set, template is setup as
1836 * rootfs.path. The container is already created if we have a config and
1837 * rootfs.path is accessible
1839 if (!c
->lxc_conf
->rootfs
.path
&& !tpath
) {
1840 /* No template passed in and rootfs does not exist. */
1841 if (!c
->save_config(c
, NULL
)) {
1842 ERROR("Failed to save initial config for \"%s\"", c
->name
);
1849 /* Rootfs passed into configuration, but does not exist. */
1850 if (c
->lxc_conf
->rootfs
.path
&& access(c
->lxc_conf
->rootfs
.path
, F_OK
) != 0)
1853 if (do_lxcapi_is_defined(c
) && c
->lxc_conf
->rootfs
.path
&& !tpath
) {
1854 /* Rootfs already existed, user just wanted to save the loaded
1857 if (!c
->save_config(c
, NULL
))
1858 ERROR("Failed to save initial config for \"%s\"", c
->name
);
1864 /* Mark that this container is being created */
1865 partial_fd
= create_partial(c
);
1869 /* No need to get disk lock bc we have the partial lock. */
1873 /* Create the storage.
1874 * Note we can't do this in the same task as we use to execute the
1875 * template because of the way zfs works.
1876 * After you 'zfs create', zfs mounts the fs only in the initial
1881 SYSERROR("Failed to fork task for container creation template");
1885 if (pid
== 0) { /* child */
1886 struct lxc_storage
*bdev
= NULL
;
1888 bdev
= do_storage_create(c
, bdevtype
, specs
);
1890 ERROR("Failed to create %s storage for %s",
1891 bdevtype
? bdevtype
: "(none)", c
->name
);
1892 _exit(EXIT_FAILURE
);
1895 /* Save config file again to store the new rootfs location. */
1896 if (!do_lxcapi_save_config(c
, NULL
)) {
1897 ERROR("Failed to save initial config for %s", c
->name
);
1898 /* Parent task won't see the storage driver in the
1899 * config so we delete it.
1901 bdev
->ops
->umount(bdev
);
1902 bdev
->ops
->destroy(bdev
);
1903 _exit(EXIT_FAILURE
);
1906 _exit(EXIT_SUCCESS
);
1909 if (wait_for_pid(pid
) != 0)
1912 /* Reload config to get the rootfs. */
1913 lxc_conf_free(c
->lxc_conf
);
1916 if (!load_config_locked(c
, c
->configfile
))
1919 if (!create_run_template(c
, tpath
, !!(flags
& LXC_CREATE_QUIET
), argv
))
1922 /* Now clear out the lxc_conf we have, reload from the created
1925 do_lxcapi_clear_config(c
);
1928 if (!prepend_lxc_header(c
->configfile
, tpath
, argv
)) {
1929 ERROR("Failed to prepend header to config file");
1934 ret
= load_config_locked(c
, c
->configfile
);
1938 if (partial_fd
>= 0)
1939 remove_partial(c
, partial_fd
);
1943 container_destroy(c
, NULL
);
1950 static bool lxcapi_create(struct lxc_container
*c
, const char *t
,
1951 const char *bdevtype
, struct bdev_specs
*specs
,
1952 int flags
, char *const argv
[])
1956 current_config
= c
? c
->lxc_conf
: NULL
;
1958 ret
= do_lxcapi_create(c
, t
, bdevtype
, specs
, flags
, argv
);
1959 current_config
= NULL
;
1963 static bool do_lxcapi_reboot(struct lxc_container
*c
)
1967 int rebootsignal
= SIGINT
;
1972 if (!do_lxcapi_is_running(c
))
1975 pid
= do_lxcapi_init_pid(c
);
1979 if (c
->lxc_conf
&& c
->lxc_conf
->rebootsignal
)
1980 rebootsignal
= c
->lxc_conf
->rebootsignal
;
1982 ret
= kill(pid
, rebootsignal
);
1984 WARN("Failed to send signal %d to pid %d", rebootsignal
, pid
);
1991 WRAP_API(bool, lxcapi_reboot
)
1993 static bool do_lxcapi_reboot2(struct lxc_container
*c
, int timeout
)
1997 int rebootsignal
= SIGINT
, state_client_fd
= -1;
1998 lxc_state_t states
[MAX_STATE
] = {0};
2003 if (!do_lxcapi_is_running(c
))
2006 pid
= do_lxcapi_init_pid(c
);
2010 if (c
->lxc_conf
&& c
->lxc_conf
->rebootsignal
)
2011 rebootsignal
= c
->lxc_conf
->rebootsignal
;
2013 /* Add a new state client before sending the shutdown signal so that we
2014 * don't miss a state.
2017 states
[RUNNING
] = 2;
2018 ret
= lxc_cmd_add_state_client(c
->name
, c
->config_path
, states
,
2023 if (state_client_fd
< 0)
2029 if (ret
< MAX_STATE
)
2033 /* Send reboot signal to container. */
2034 killret
= kill(pid
, rebootsignal
);
2036 if (state_client_fd
>= 0)
2037 close(state_client_fd
);
2039 WARN("Failed to send signal %d to pid %d", rebootsignal
, pid
);
2042 TRACE("Sent signal %d to pid %d", rebootsignal
, pid
);
2047 ret
= lxc_cmd_sock_rcv_state(state_client_fd
, timeout
);
2048 close(state_client_fd
);
2052 TRACE("Received state \"%s\"", lxc_state2str(ret
));
2059 WRAP_API_1(bool, lxcapi_reboot2
, int)
2061 static bool do_lxcapi_shutdown(struct lxc_container
*c
, int timeout
)
2065 int haltsignal
= SIGPWR
, state_client_fd
= -EBADF
;
2066 lxc_state_t states
[MAX_STATE
] = {0};
2071 if (!do_lxcapi_is_running(c
))
2074 pid
= do_lxcapi_init_pid(c
);
2078 /* Detect whether we should send SIGRTMIN + 3 (e.g. systemd). */
2079 if (c
->lxc_conf
&& c
->lxc_conf
->haltsignal
)
2080 haltsignal
= c
->lxc_conf
->haltsignal
;
2081 else if (task_blocks_signal(pid
, (SIGRTMIN
+ 3)))
2082 haltsignal
= (SIGRTMIN
+ 3);
2084 /* Add a new state client before sending the shutdown signal so that we
2085 * don't miss a state.
2088 states
[STOPPED
] = 1;
2089 ret
= lxc_cmd_add_state_client(c
->name
, c
->config_path
, states
,
2094 if (state_client_fd
< 0)
2100 if (ret
< MAX_STATE
)
2104 /* Send shutdown signal to container. */
2105 killret
= kill(pid
, haltsignal
);
2107 if (state_client_fd
>= 0)
2108 close(state_client_fd
);
2110 WARN("Failed to send signal %d to pid %d", haltsignal
, pid
);
2113 TRACE("Sent signal %d to pid %d", haltsignal
, pid
);
2118 ret
= lxc_cmd_sock_rcv_state(state_client_fd
, timeout
);
2119 close(state_client_fd
);
2123 TRACE("Received state \"%s\"", lxc_state2str(ret
));
2130 WRAP_API_1(bool, lxcapi_shutdown
, int)
2132 static bool lxcapi_createl(struct lxc_container
*c
, const char *t
,
2133 const char *bdevtype
, struct bdev_specs
*specs
, int flags
, ...)
2142 current_config
= c
->lxc_conf
;
2145 * since we're going to wait for create to finish, I don't think we
2146 * need to get a copy of the arguments.
2148 va_start(ap
, flags
);
2149 args
= lxc_va_arg_list_to_argv(ap
, 0, 0);
2152 ERROR("Failed to allocate memory");
2156 bret
= do_lxcapi_create(c
, t
, bdevtype
, specs
, flags
, args
);
2160 current_config
= NULL
;
2164 static void do_clear_unexp_config_line(struct lxc_conf
*conf
, const char *key
)
2166 if (!strcmp(key
, "lxc.cgroup"))
2167 return clear_unexp_config_line(conf
, key
, true);
2169 if (!strcmp(key
, "lxc.network"))
2170 return clear_unexp_config_line(conf
, key
, true);
2172 if (!strcmp(key
, "lxc.net"))
2173 return clear_unexp_config_line(conf
, key
, true);
2175 /* Clear a network with a specific index. */
2176 if (!strncmp(key
, "lxc.net.", 8)) {
2181 ret
= lxc_safe_uint(idx
, &(unsigned int){0});
2183 return clear_unexp_config_line(conf
, key
, true);
2186 if (!strcmp(key
, "lxc.hook"))
2187 return clear_unexp_config_line(conf
, key
, true);
2189 return clear_unexp_config_line(conf
, key
, false);
2192 static bool do_lxcapi_clear_config_item(struct lxc_container
*c
,
2196 struct lxc_config_t
*config
;
2198 if (!c
|| !c
->lxc_conf
)
2201 if (container_mem_lock(c
))
2204 config
= lxc_get_config(key
);
2205 /* Verify that the config key exists and that it has a callback
2208 if (config
&& config
->clr
)
2209 ret
= config
->clr(key
, c
->lxc_conf
, NULL
);
2212 do_clear_unexp_config_line(c
->lxc_conf
, key
);
2214 container_mem_unlock(c
);
2218 WRAP_API_1(bool, lxcapi_clear_config_item
, const char *)
2220 static inline bool enter_net_ns(struct lxc_container
*c
)
2222 pid_t pid
= do_lxcapi_init_pid(c
);
2224 if ((geteuid() != 0 || (c
->lxc_conf
&& !lxc_list_empty(&c
->lxc_conf
->id_map
))) &&
2225 (access("/proc/self/ns/user", F_OK
) == 0))
2226 if (!switch_to_ns(pid
, "user"))
2229 return switch_to_ns(pid
, "net");
2232 /* Used by qsort and bsearch functions for comparing names. */
2233 static inline int string_cmp(char **first
, char **second
)
2235 return strcmp(*first
, *second
);
2238 /* Used by qsort and bsearch functions for comparing container names. */
2239 static inline int container_cmp(struct lxc_container
**first
,
2240 struct lxc_container
**second
)
2242 return strcmp((*first
)->name
, (*second
)->name
);
2245 static bool add_to_array(char ***names
, char *cname
, int pos
)
2247 char **newnames
= realloc(*names
, (pos
+1) * sizeof(char *));
2249 ERROR("Out of memory");
2254 newnames
[pos
] = strdup(cname
);
2258 /* Sort the arrray as we will use binary search on it. */
2259 qsort(newnames
, pos
+ 1, sizeof(char *),
2260 (int (*)(const void *, const void *))string_cmp
);
2265 static bool add_to_clist(struct lxc_container
***list
, struct lxc_container
*c
,
2268 struct lxc_container
**newlist
= realloc(*list
, (pos
+ 1) * sizeof(struct lxc_container
*));
2270 ERROR("Out of memory");
2277 /* Sort the arrray as we will use binary search on it. */
2279 qsort(newlist
, pos
+ 1, sizeof(struct lxc_container
*),
2280 (int (*)(const void *, const void *))container_cmp
);
2285 static char** get_from_array(char ***names
, char *cname
, int size
)
2287 return (char **)bsearch(&cname
, *names
, size
, sizeof(char *), (int (*)(const void *, const void *))string_cmp
);
2290 static bool array_contains(char ***names
, char *cname
, int size
)
2292 if(get_from_array(names
, cname
, size
) != NULL
)
2298 static bool remove_from_array(char ***names
, char *cname
, int size
)
2300 char **result
= get_from_array(names
, cname
, size
);
2301 if (result
!= NULL
) {
2309 static char **do_lxcapi_get_interfaces(struct lxc_container
*c
)
2312 int i
, count
= 0, pipefd
[2];
2313 char **interfaces
= NULL
;
2314 char interface
[IFNAMSIZ
];
2316 if (pipe2(pipefd
, O_CLOEXEC
) < 0)
2321 SYSERROR("Failed to fork task to get interfaces information");
2327 if (pid
== 0) { /* child */
2328 int ret
= 1, nbytes
;
2329 struct netns_ifaddrs
*interfaceArray
= NULL
, *tempIfAddr
= NULL
;
2331 /* close the read-end of the pipe */
2334 if (!enter_net_ns(c
)) {
2335 SYSERROR("Failed to enter network namespace");
2339 /* Grab the list of interfaces */
2340 if (netns_getifaddrs(&interfaceArray
, -1, &(bool){false})) {
2341 SYSERROR("Failed to get interfaces list");
2345 /* Iterate through the interfaces */
2346 for (tempIfAddr
= interfaceArray
; tempIfAddr
!= NULL
;
2347 tempIfAddr
= tempIfAddr
->ifa_next
) {
2348 nbytes
= lxc_write_nointr(pipefd
[1], tempIfAddr
->ifa_name
, IFNAMSIZ
);
2359 netns_freeifaddrs(interfaceArray
);
2361 /* close the write-end of the pipe, thus sending EOF to the reader */
2366 /* close the write-end of the pipe */
2369 while (lxc_read_nointr(pipefd
[0], &interface
, IFNAMSIZ
) == IFNAMSIZ
) {
2370 interface
[IFNAMSIZ
- 1] = '\0';
2372 if (array_contains(&interfaces
, interface
, count
))
2375 if (!add_to_array(&interfaces
, interface
, count
))
2376 ERROR("Failed to add \"%s\" to array", interface
);
2381 if (wait_for_pid(pid
) != 0) {
2382 for (i
= 0; i
< count
; i
++)
2383 free(interfaces
[i
]);
2389 /* close the read-end of the pipe */
2392 /* Append NULL to the array */
2394 interfaces
= (char **)lxc_append_null_to_array((void **)interfaces
, count
);
2399 WRAP_API(char **, lxcapi_get_interfaces
)
2401 static char **do_lxcapi_get_ips(struct lxc_container
*c
, const char *interface
,
2402 const char *family
, int scope
)
2407 char address
[INET6_ADDRSTRLEN
];
2409 char **addresses
= NULL
;
2411 ret
= pipe2(pipefd
, O_CLOEXEC
);
2413 SYSERROR("Failed to create pipe");
2419 SYSERROR("Failed to create new process");
2427 char addressOutputBuffer
[INET6_ADDRSTRLEN
];
2429 char *address
= NULL
;
2430 void *tempAddrPtr
= NULL
;
2431 struct netns_ifaddrs
*interfaceArray
= NULL
, *tempIfAddr
= NULL
;
2433 /* close the read-end of the pipe */
2436 if (!enter_net_ns(c
)) {
2437 SYSERROR("Failed to attach to network namespace");
2441 /* Grab the list of interfaces */
2442 if (netns_getifaddrs(&interfaceArray
, -1, &(bool){false})) {
2443 SYSERROR("Failed to get interfaces list");
2447 /* Iterate through the interfaces */
2448 for (tempIfAddr
= interfaceArray
; tempIfAddr
;
2449 tempIfAddr
= tempIfAddr
->ifa_next
) {
2450 if (tempIfAddr
->ifa_addr
== NULL
)
2453 #pragma GCC diagnostic push
2454 #pragma GCC diagnostic ignored "-Wcast-align"
2456 if (tempIfAddr
->ifa_addr
->sa_family
== AF_INET
) {
2457 if (family
&& strcmp(family
, "inet"))
2460 tempAddrPtr
= &((struct sockaddr_in
*)tempIfAddr
->ifa_addr
)->sin_addr
;
2462 if (family
&& strcmp(family
, "inet6"))
2465 if (((struct sockaddr_in6
*)tempIfAddr
->ifa_addr
)->sin6_scope_id
!= scope
)
2468 tempAddrPtr
= &((struct sockaddr_in6
*)tempIfAddr
->ifa_addr
)->sin6_addr
;
2471 #pragma GCC diagnostic pop
2473 if (interface
&& strcmp(interface
, tempIfAddr
->ifa_name
))
2475 else if (!interface
&& strcmp("lo", tempIfAddr
->ifa_name
) == 0)
2478 address
= (char *)inet_ntop(tempIfAddr
->ifa_addr
->sa_family
,
2479 tempAddrPtr
, addressOutputBuffer
,
2480 sizeof(addressOutputBuffer
));
2484 nbytes
= lxc_write_nointr(pipefd
[1], address
, INET6_ADDRSTRLEN
);
2485 if (nbytes
!= INET6_ADDRSTRLEN
) {
2486 SYSERROR("Failed to send ipv6 address \"%s\"",
2498 netns_freeifaddrs(interfaceArray
);
2500 /* close the write-end of the pipe, thus sending EOF to the reader */
2505 /* close the write-end of the pipe */
2508 while (lxc_read_nointr(pipefd
[0], &address
, INET6_ADDRSTRLEN
) == INET6_ADDRSTRLEN
) {
2509 address
[INET6_ADDRSTRLEN
- 1] = '\0';
2511 if (!add_to_array(&addresses
, address
, count
))
2512 ERROR("PARENT: add_to_array failed");
2517 if (wait_for_pid(pid
) != 0) {
2518 for (i
= 0; i
< count
; i
++)
2525 /* close the read-end of the pipe */
2528 /* Append NULL to the array */
2530 addresses
= (char **)lxc_append_null_to_array((void **)addresses
, count
);
2535 WRAP_API_3(char **, lxcapi_get_ips
, const char *, const char *, int)
2537 static int do_lxcapi_get_config_item(struct lxc_container
*c
, const char *key
, char *retv
, int inlen
)
2540 struct lxc_config_t
*config
;
2542 if (!c
|| !c
->lxc_conf
)
2545 if (container_mem_lock(c
))
2548 config
= lxc_get_config(key
);
2549 /* Verify that the config key exists and that it has a callback
2552 if (config
&& config
->get
)
2553 ret
= config
->get(key
, retv
, inlen
, c
->lxc_conf
, NULL
);
2555 container_mem_unlock(c
);
2559 WRAP_API_3(int, lxcapi_get_config_item
, const char *, char *, int)
2561 static char* do_lxcapi_get_running_config_item(struct lxc_container
*c
, const char *key
)
2565 if (!c
|| !c
->lxc_conf
)
2568 if (container_mem_lock(c
))
2571 ret
= lxc_cmd_get_config_item(c
->name
, key
, do_lxcapi_get_config_path(c
));
2572 container_mem_unlock(c
);
2576 WRAP_API_1(char *, lxcapi_get_running_config_item
, const char *)
2578 static int do_lxcapi_get_keys(struct lxc_container
*c
, const char *key
, char *retv
, int inlen
)
2582 /* List all config items. */
2584 return lxc_list_config_items(retv
, inlen
);
2586 if (!c
|| !c
->lxc_conf
)
2589 if (container_mem_lock(c
))
2592 /* Support 'lxc.net.<idx>', i.e. 'lxc.net.0'
2593 * This is an intelligent result to show which keys are valid given the
2594 * type of nic it is.
2596 if (strncmp(key
, "lxc.net.", 8) == 0)
2597 ret
= lxc_list_net(c
->lxc_conf
, key
, retv
, inlen
);
2599 ret
= lxc_list_subkeys(c
->lxc_conf
, key
, retv
, inlen
);
2601 container_mem_unlock(c
);
2605 WRAP_API_3(int, lxcapi_get_keys
, const char *, char *, int)
2607 static bool do_lxcapi_save_config(struct lxc_container
*c
, const char *alt_file
)
2610 bool ret
= false, need_disklock
= false;
2613 alt_file
= c
->configfile
;
2618 /* If we haven't yet loaded a config, load the stock config. */
2620 if (!do_lxcapi_load_config(c
, lxc_global_config_value("lxc.default_config"))) {
2621 ERROR("Error loading default configuration file %s "
2623 lxc_global_config_value("lxc.default_config"),
2629 if (!create_container_dir(c
))
2632 /* If we're writing to the container's config file, take the disk lock.
2633 * Otherwise just take the memlock to protect the struct lxc_container
2634 * while we're traversing it.
2636 if (strcmp(c
->configfile
, alt_file
) == 0)
2637 need_disklock
= true;
2640 lret
= container_disk_lock(c
);
2642 lret
= container_mem_lock(c
);
2646 fd
= open(alt_file
, O_WRONLY
| O_CREAT
| O_TRUNC
| O_CLOEXEC
,
2647 S_IRUSR
| S_IWUSR
| S_IRGRP
| S_IWGRP
);
2651 lret
= write_config(fd
, c
->lxc_conf
);
2660 container_disk_unlock(c
);
2662 container_mem_unlock(c
);
2667 WRAP_API_1(bool, lxcapi_save_config
, const char *)
2670 static bool mod_rdep(struct lxc_container
*c0
, struct lxc_container
*c
, bool inc
)
2676 char path
[PATH_MAX
];
2677 char newpath
[PATH_MAX
];
2678 int fd
, ret
, n
= 0, v
= 0;
2680 size_t len
= 0, bytes
= 0;
2682 if (container_disk_lock(c0
))
2685 ret
= snprintf(path
, PATH_MAX
, "%s/%s/lxc_snapshots", c0
->config_path
, c0
->name
);
2686 if (ret
< 0 || ret
> PATH_MAX
)
2689 ret
= snprintf(newpath
, PATH_MAX
, "%s\n%s\n", c
->config_path
, c
->name
);
2690 if (ret
< 0 || ret
> PATH_MAX
)
2693 /* If we find an lxc-snapshot file using the old format only listing the
2694 * number of snapshots we will keep using it. */
2695 f1
= fopen(path
, "r");
2697 n
= fscanf(f1
, "%d", &v
);
2699 if (n
== 1 && v
== 0) {
2702 SYSERROR("Failed to remove \"%s\"", path
);
2710 f1
= fopen(path
, "w");
2714 if (fprintf(f1
, "%d\n", v
) < 0) {
2715 ERROR("Error writing new snapshots value");
2722 SYSERROR("Error writing to or closing snapshots file");
2726 /* Here we know that we have or can use an lxc-snapshot file
2727 * using the new format. */
2729 f1
= fopen(path
, "a");
2733 if (fprintf(f1
, "%s", newpath
) < 0) {
2734 ERROR("Error writing new snapshots entry");
2737 SYSERROR("Error writing to or closing snapshots file");
2743 SYSERROR("Error writing to or closing snapshots file");
2747 if ((fd
= open(path
, O_RDWR
| O_CLOEXEC
)) < 0)
2750 if (fstat(fd
, &fbuf
) < 0) {
2755 if (fbuf
.st_size
!= 0) {
2756 buf
= lxc_strmmap(NULL
, fbuf
.st_size
, PROT_READ
| PROT_WRITE
, MAP_SHARED
, fd
, 0);
2757 if (buf
== MAP_FAILED
) {
2758 SYSERROR("Failed to create mapping %s", path
);
2763 len
= strlen(newpath
);
2764 while ((del
= strstr((char *)buf
, newpath
))) {
2765 memmove(del
, del
+ len
, strlen(del
) - len
+ 1);
2769 lxc_strmunmap(buf
, fbuf
.st_size
);
2770 if (ftruncate(fd
, fbuf
.st_size
- bytes
) < 0) {
2771 SYSERROR("Failed to truncate file %s", path
);
2780 /* If the lxc-snapshot file is empty, remove it. */
2781 if (stat(path
, &fbuf
) < 0)
2784 if (!fbuf
.st_size
) {
2787 SYSERROR("Failed to remove \"%s\"", path
);
2794 container_disk_unlock(c0
);
2798 void mod_all_rdeps(struct lxc_container
*c
, bool inc
)
2800 struct lxc_container
*p
;
2801 char *lxcpath
= NULL
, *lxcname
= NULL
, path
[PATH_MAX
];
2802 size_t pathlen
= 0, namelen
= 0;
2806 ret
= snprintf(path
, PATH_MAX
, "%s/%s/lxc_rdepends",
2807 c
->config_path
, c
->name
);
2808 if (ret
< 0 || ret
>= PATH_MAX
) {
2809 ERROR("Path name too long");
2813 f
= fopen(path
, "r");
2817 while (getline(&lxcpath
, &pathlen
, f
) != -1) {
2818 if (getline(&lxcname
, &namelen
, f
) == -1) {
2819 ERROR("badly formatted file %s", path
);
2823 remove_trailing_newlines(lxcpath
);
2824 remove_trailing_newlines(lxcname
);
2826 if ((p
= lxc_container_new(lxcname
, lxcpath
)) == NULL
) {
2827 ERROR("Unable to find dependent container %s:%s",
2832 if (!mod_rdep(p
, c
, inc
))
2833 ERROR("Failed to update snapshots file for %s:%s",
2836 lxc_container_put(p
);
2845 static bool has_fs_snapshots(struct lxc_container
*c
)
2848 char path
[PATH_MAX
];
2853 ret
= snprintf(path
, PATH_MAX
, "%s/%s/lxc_snapshots", c
->config_path
,
2855 if (ret
< 0 || ret
> PATH_MAX
)
2858 /* If the file doesn't exist there are no snapshots. */
2859 if (stat(path
, &fbuf
) < 0)
2864 f
= fopen(path
, "r");
2868 ret
= fscanf(f
, "%d", &v
);
2870 /* TODO: Figure out what to do with the return value of fscanf. */
2872 INFO("Container uses new lxc-snapshots format %s", path
);
2881 static bool has_snapshots(struct lxc_container
*c
)
2883 char path
[PATH_MAX
];
2884 struct dirent
*direntp
;
2888 if (!get_snappath_dir(c
, path
))
2891 dir
= opendir(path
);
2895 while ((direntp
= readdir(dir
))) {
2896 if (!strcmp(direntp
->d_name
, "."))
2899 if (!strcmp(direntp
->d_name
, ".."))
2909 static bool do_destroy_container(struct lxc_conf
*conf
) {
2912 if (am_guest_unpriv()) {
2913 ret
= userns_exec_full(conf
, storage_destroy_wrapper
, conf
,
2914 "storage_destroy_wrapper");
2921 return storage_destroy(conf
);
2924 static int lxc_rmdir_onedev_wrapper(void *data
)
2926 char *arg
= (char *) data
;
2927 return lxc_rmdir_onedev(arg
, "snaps");
2930 static int lxc_unlink_exec_wrapper(void *data
)
2936 static bool container_destroy(struct lxc_container
*c
,
2937 struct lxc_storage
*storage
)
2941 struct lxc_conf
*conf
;
2946 if (!c
|| !do_lxcapi_is_defined(c
))
2950 if (container_disk_lock(c
))
2953 if (!is_stopped(c
)) {
2954 /* We should queue some sort of error - in c->error_string? */
2955 ERROR("container %s is not stopped", c
->name
);
2959 if (conf
&& !lxc_list_empty(&conf
->hooks
[LXCHOOK_DESTROY
])) {
2960 /* Start of environment variable setup for hooks */
2961 if (setenv("LXC_NAME", c
->name
, 1))
2962 SYSERROR("Failed to set environment variable for container name");
2964 if (conf
->rcfile
&& setenv("LXC_CONFIG_FILE", conf
->rcfile
, 1))
2965 SYSERROR("Failed to set environment variable for config path");
2967 if (conf
->rootfs
.mount
&& setenv("LXC_ROOTFS_MOUNT", conf
->rootfs
.mount
, 1))
2968 SYSERROR("Failed to set environment variable for rootfs mount");
2970 if (conf
->rootfs
.path
&& setenv("LXC_ROOTFS_PATH", conf
->rootfs
.path
, 1))
2971 SYSERROR("Failed to set environment variable for rootfs mount");
2973 if (conf
->console
.path
&& setenv("LXC_CONSOLE", conf
->console
.path
, 1))
2974 SYSERROR("Failed to set environment variable for console path");
2976 if (conf
->console
.log_path
&& setenv("LXC_CONSOLE_LOGPATH", conf
->console
.log_path
, 1))
2977 SYSERROR("Failed to set environment variable for console log");
2978 /* End of environment variable setup for hooks */
2980 if (run_lxc_hooks(c
->name
, "destroy", conf
, NULL
)) {
2981 ERROR("Failed to execute clone hook for \"%s\"", c
->name
);
2986 if (current_config
&& conf
== current_config
) {
2987 current_config
= NULL
;
2989 if (conf
->logfd
!= -1) {
2995 /* LXC is not managing the storage of the container. */
2996 if (conf
&& !conf
->rootfs
.managed
)
2999 if (conf
&& conf
->rootfs
.path
&& conf
->rootfs
.mount
) {
3000 if (!do_destroy_container(conf
)) {
3001 ERROR("Error destroying rootfs for %s", c
->name
);
3004 INFO("Destroyed rootfs for %s", c
->name
);
3007 mod_all_rdeps(c
, false);
3009 p1
= do_lxcapi_get_config_path(c
);
3018 * strlen("config") = 6
3022 len
= strlen(p1
) + 1 + strlen(c
->name
) + 1 + 6 + 1;
3025 ERROR("Failed to allocate memory");
3029 /* For an overlay container the rootfs is considered immutable and
3030 * cannot be removed when restoring from a snapshot.
3032 if (storage
&& (!strcmp(storage
->type
, "overlay") ||
3033 !strcmp(storage
->type
, "overlayfs")) &&
3034 (storage
->flags
& LXC_STORAGE_INTERNAL_OVERLAY_RESTORE
)) {
3035 ret
= snprintf(path
, len
, "%s/%s/config", p1
, c
->name
);
3036 if (ret
< 0 || (size_t)ret
>= len
)
3039 if (am_guest_unpriv())
3040 ret
= userns_exec_1(conf
, lxc_unlink_exec_wrapper
, path
,
3041 "lxc_unlink_exec_wrapper");
3045 SYSERROR("Failed to destroy config file \"%s\" for \"%s\"",
3049 INFO("Destroyed config file \"%s\" for \"%s\"", path
, c
->name
);
3055 ret
= snprintf(path
, len
, "%s/%s", p1
, c
->name
);
3056 if (ret
< 0 || (size_t)ret
>= len
)
3059 if (am_guest_unpriv())
3060 ret
= userns_exec_full(conf
, lxc_rmdir_onedev_wrapper
, path
,
3061 "lxc_rmdir_onedev_wrapper");
3063 ret
= lxc_rmdir_onedev(path
, "snaps");
3065 ERROR("Failed to destroy directory \"%s\" for \"%s\"", path
,
3069 INFO("Destroyed directory \"%s\" for \"%s\"", path
, c
->name
);
3078 container_disk_unlock(c
);
3082 static bool do_lxcapi_destroy(struct lxc_container
*c
)
3084 if (!c
|| !lxcapi_is_defined(c
))
3087 if (c
->lxc_conf
&& c
->lxc_conf
->rootfs
.managed
) {
3088 if (has_snapshots(c
)) {
3089 ERROR("Container %s has snapshots; not removing", c
->name
);
3093 if (has_fs_snapshots(c
)) {
3094 ERROR("container %s has snapshots on its rootfs", c
->name
);
3099 return container_destroy(c
, NULL
);
3102 WRAP_API(bool, lxcapi_destroy
)
3104 static bool do_lxcapi_destroy_with_snapshots(struct lxc_container
*c
)
3106 if (!c
|| !lxcapi_is_defined(c
))
3109 if (!lxcapi_snapshot_destroy_all(c
)) {
3110 ERROR("Error deleting all snapshots");
3114 return lxcapi_destroy(c
);
3117 WRAP_API(bool, lxcapi_destroy_with_snapshots
)
3119 int lxc_set_config_item_locked(struct lxc_conf
*conf
, const char *key
,
3123 struct lxc_config_t
*config
;
3126 config
= lxc_get_config(key
);
3130 ret
= config
->set(key
, v
, conf
, NULL
);
3134 if (lxc_config_value_empty(v
))
3135 do_clear_unexp_config_line(conf
, key
);
3137 bret
= do_append_unexp_config_line(conf
, key
, v
);
3144 static bool do_set_config_item_locked(struct lxc_container
*c
, const char *key
,
3150 c
->lxc_conf
= lxc_conf_init();
3155 ret
= lxc_set_config_item_locked(c
->lxc_conf
, key
, v
);
3162 static bool do_lxcapi_set_config_item(struct lxc_container
*c
, const char *key
, const char *v
)
3169 if (container_mem_lock(c
))
3172 b
= do_set_config_item_locked(c
, key
, v
);
3174 container_mem_unlock(c
);
3178 WRAP_API_2(bool, lxcapi_set_config_item
, const char *, const char *)
3180 static char *lxcapi_config_file_name(struct lxc_container
*c
)
3182 if (!c
|| !c
->configfile
)
3185 return strdup(c
->configfile
);
3188 static const char *lxcapi_get_config_path(struct lxc_container
*c
)
3190 if (!c
|| !c
->config_path
)
3193 return (const char *)(c
->config_path
);
3198 * Just recalculate the c->configfile based on the
3199 * c->config_path, which must be set.
3200 * The lxc_container must be locked or not yet public.
3202 static bool set_config_filename(struct lxc_container
*c
)
3207 if (!c
->config_path
)
3210 /* $lxc_path + "/" + c->name + "/" + "config" + '\0' */
3211 len
= strlen(c
->config_path
) + strlen(c
->name
) + strlen("config") + 3;
3212 newpath
= malloc(len
);
3216 ret
= snprintf(newpath
, len
, "%s/%s/config", c
->config_path
, c
->name
);
3217 if (ret
< 0 || ret
>= len
) {
3218 fprintf(stderr
, "Error printing out config file name\n");
3223 free(c
->configfile
);
3224 c
->configfile
= newpath
;
3229 static bool do_lxcapi_set_config_path(struct lxc_container
*c
, const char *path
)
3233 char *oldpath
= NULL
;
3238 if (container_mem_lock(c
))
3243 ERROR("Out of memory setting new lxc path");
3249 oldpath
= c
->config_path
;
3252 /* Since we've changed the config path, we have to change the
3253 * config file name too */
3254 if (!set_config_filename(c
)) {
3255 ERROR("Out of memory setting new config filename");
3257 free(c
->config_path
);
3258 c
->config_path
= oldpath
;
3264 container_mem_unlock(c
);
3268 WRAP_API_1(bool, lxcapi_set_config_path
, const char *)
3270 static bool do_lxcapi_set_cgroup_item(struct lxc_container
*c
, const char *subsys
, const char *value
)
3273 struct cgroup_ops
*cgroup_ops
;
3281 cgroup_ops
= cgroup_init(c
->lxc_conf
);
3285 ret
= cgroup_ops
->set(cgroup_ops
, subsys
, value
, c
->name
, c
->config_path
);
3287 cgroup_exit(cgroup_ops
);
3292 WRAP_API_2(bool, lxcapi_set_cgroup_item
, const char *, const char *)
3294 static int do_lxcapi_get_cgroup_item(struct lxc_container
*c
, const char *subsys
, char *retv
, int inlen
)
3297 struct cgroup_ops
*cgroup_ops
;
3305 cgroup_ops
= cgroup_init(c
->lxc_conf
);
3309 ret
= cgroup_ops
->get(cgroup_ops
, subsys
, retv
, inlen
, c
->name
,
3312 cgroup_exit(cgroup_ops
);
3317 WRAP_API_3(int, lxcapi_get_cgroup_item
, const char *, char *, int)
3319 const char *lxc_get_global_config_item(const char *key
)
3321 return lxc_global_config_value(key
);
3324 const char *lxc_get_version(void)
3329 static int copy_file(const char *old
, const char *new)
3336 if (file_exists(new)) {
3337 ERROR("copy destination %s exists", new);
3341 ret
= stat(old
, &sbuf
);
3343 INFO("Error stat'ing %s", old
);
3347 in
= open(old
, O_RDONLY
);
3349 SYSERROR("Error opening original file %s", old
);
3353 out
= open(new, O_CREAT
| O_EXCL
| O_WRONLY
, 0644);
3355 SYSERROR("Error opening new file %s", new);
3361 len
= lxc_read_nointr(in
, buf
, 8096);
3363 SYSERROR("Error reading old file %s", old
);
3370 ret
= lxc_write_nointr(out
, buf
, len
);
3371 if (ret
< len
) { /* should we retry? */
3372 SYSERROR("Error: write to new file %s was interrupted", new);
3380 /* We set mode, but not owner/group. */
3381 ret
= chmod(new, sbuf
.st_mode
);
3383 SYSERROR("Error setting mode on %s", new);
3395 static int copyhooks(struct lxc_container
*oldc
, struct lxc_container
*c
)
3398 struct lxc_list
*it
;
3401 len
= strlen(oldc
->config_path
) + strlen(oldc
->name
) + 3;
3402 cpath
= alloca(len
);
3403 ret
= snprintf(cpath
, len
, "%s/%s/", oldc
->config_path
, oldc
->name
);
3404 if (ret
< 0 || ret
>= len
)
3407 for (i
=0; i
<NUM_LXC_HOOKS
; i
++) {
3408 lxc_list_for_each(it
, &c
->lxc_conf
->hooks
[i
]) {
3409 char *hookname
= it
->elem
;
3410 char *fname
= strrchr(hookname
, '/');
3411 char tmppath
[PATH_MAX
];
3412 if (!fname
) /* relative path - we don't support, but maybe we should */
3415 if (strncmp(hookname
, cpath
, len
- 1) != 0) {
3416 /* this hook is public - ignore */
3420 /* copy the script, and change the entry in confile */
3421 ret
= snprintf(tmppath
, PATH_MAX
, "%s/%s/%s",
3422 c
->config_path
, c
->name
, fname
+1);
3423 if (ret
< 0 || ret
>= PATH_MAX
)
3426 ret
= copy_file(it
->elem
, tmppath
);
3432 it
->elem
= strdup(tmppath
);
3434 ERROR("out of memory copying hook path");
3440 if (!clone_update_unexp_hooks(c
->lxc_conf
, oldc
->config_path
,
3441 c
->config_path
, oldc
->name
, c
->name
)) {
3442 ERROR("Error saving new hooks in clone");
3446 do_lxcapi_save_config(c
, NULL
);
3451 static int copy_fstab(struct lxc_container
*oldc
, struct lxc_container
*c
)
3453 char newpath
[PATH_MAX
];
3454 char *oldpath
= oldc
->lxc_conf
->fstab
;
3460 clear_unexp_config_line(c
->lxc_conf
, "lxc.mount.fstab", false);
3462 char *p
= strrchr(oldpath
, '/');
3466 ret
= snprintf(newpath
, PATH_MAX
, "%s/%s%s",
3467 c
->config_path
, c
->name
, p
);
3468 if (ret
< 0 || ret
>= PATH_MAX
) {
3469 ERROR("error printing new path for %s", oldpath
);
3473 if (file_exists(newpath
)) {
3474 ERROR("error: fstab file %s exists", newpath
);
3478 if (copy_file(oldpath
, newpath
) < 0) {
3479 ERROR("error: copying %s to %s", oldpath
, newpath
);
3483 free(c
->lxc_conf
->fstab
);
3485 c
->lxc_conf
->fstab
= strdup(newpath
);
3486 if (!c
->lxc_conf
->fstab
) {
3487 ERROR("error: allocating pathname");
3491 if (!do_append_unexp_config_line(c
->lxc_conf
, "lxc.mount.fstab", newpath
)) {
3492 ERROR("error saving new lxctab");
3499 static void copy_rdepends(struct lxc_container
*c
, struct lxc_container
*c0
)
3501 char path0
[PATH_MAX
], path1
[PATH_MAX
];
3504 ret
= snprintf(path0
, PATH_MAX
, "%s/%s/lxc_rdepends", c0
->config_path
,
3506 if (ret
< 0 || ret
>= PATH_MAX
) {
3507 WARN("Error copying reverse dependencies");
3511 ret
= snprintf(path1
, PATH_MAX
, "%s/%s/lxc_rdepends", c
->config_path
,
3513 if (ret
< 0 || ret
>= PATH_MAX
) {
3514 WARN("Error copying reverse dependencies");
3518 if (copy_file(path0
, path1
) < 0) {
3519 INFO("Error copying reverse dependencies");
3524 static bool add_rdepends(struct lxc_container
*c
, struct lxc_container
*c0
)
3527 char path
[PATH_MAX
];
3531 ret
= snprintf(path
, PATH_MAX
, "%s/%s/lxc_rdepends", c
->config_path
,
3533 if (ret
< 0 || ret
>= PATH_MAX
)
3536 f
= fopen(path
, "a");
3542 /* If anything goes wrong, just return an error. */
3543 if (fprintf(f
, "%s\n%s\n", c0
->config_path
, c0
->name
) < 0)
3553 * If the fs natively supports snapshot clones with no penalty,
3554 * then default to those even if not requested.
3555 * Currently we only do this for btrfs.
3557 bool should_default_to_snapshot(struct lxc_container
*c0
,
3558 struct lxc_container
*c1
)
3561 size_t l0
= strlen(c0
->config_path
) + strlen(c0
->name
) + 2;
3562 size_t l1
= strlen(c1
->config_path
) + strlen(c1
->name
) + 2;
3563 char *p0
= alloca(l0
+ 1);
3564 char *p1
= alloca(l1
+ 1);
3565 char *rootfs
= c0
->lxc_conf
->rootfs
.path
;
3567 ret
= snprintf(p0
, l0
, "%s/%s", c0
->config_path
, c0
->name
);
3568 if (ret
< 0 || ret
>= l0
)
3571 ret
= snprintf(p1
, l1
, "%s/%s", c1
->config_path
, c1
->name
);
3572 if (ret
< 0 || ret
>= l1
)
3575 if (!is_btrfs_fs(p0
) || !is_btrfs_fs(p1
))
3578 if (is_btrfs_subvol(rootfs
) <= 0)
3581 return btrfs_same_fs(p0
, p1
) == 0;
3584 static int copy_storage(struct lxc_container
*c0
, struct lxc_container
*c
,
3585 const char *newtype
, int flags
, const char *bdevdata
,
3588 struct lxc_storage
*bdev
;
3591 if (should_default_to_snapshot(c0
, c
))
3592 flags
|= LXC_CLONE_SNAPSHOT
;
3594 bdev
= storage_copy(c0
, c
->name
, c
->config_path
, newtype
, flags
,
3595 bdevdata
, newsize
, &need_rdep
);
3597 ERROR("Error copying storage.");
3601 /* Set new rootfs. */
3602 free(c
->lxc_conf
->rootfs
.path
);
3603 c
->lxc_conf
->rootfs
.path
= strdup(bdev
->src
);
3606 if (!c
->lxc_conf
->rootfs
.path
) {
3607 ERROR("Out of memory while setting storage path.");
3611 /* Append a new lxc.rootfs.path entry to the unexpanded config. */
3612 clear_unexp_config_line(c
->lxc_conf
, "lxc.rootfs.path", false);
3613 if (!do_append_unexp_config_line(c
->lxc_conf
, "lxc.rootfs.path",
3614 c
->lxc_conf
->rootfs
.path
)) {
3615 ERROR("Error saving new rootfs to cloned config.");
3619 if (flags
& LXC_CLONE_SNAPSHOT
)
3620 copy_rdepends(c
, c0
);
3623 if (!add_rdepends(c
, c0
))
3624 WARN("Error adding reverse dependency from %s to %s",
3628 mod_all_rdeps(c
, true);
3633 struct clone_update_data
{
3634 struct lxc_container
*c0
;
3635 struct lxc_container
*c1
;
3640 static int clone_update_rootfs(struct clone_update_data
*data
)
3642 struct lxc_container
*c0
= data
->c0
;
3643 struct lxc_container
*c
= data
->c1
;
3644 int flags
= data
->flags
;
3645 char **hookargs
= data
->hookargs
;
3647 char path
[PATH_MAX
];
3648 struct lxc_storage
*bdev
;
3650 struct lxc_conf
*conf
= c
->lxc_conf
;
3652 /* update hostname in rootfs */
3653 /* we're going to mount, so run in a clean namespace to simplify cleanup */
3655 if (setgid(0) < 0) {
3656 ERROR("Failed to setgid to 0");
3660 if (setuid(0) < 0) {
3661 ERROR("Failed to setuid to 0");
3665 if (setgroups(0, NULL
) < 0)
3666 WARN("Failed to clear groups");
3668 if (unshare(CLONE_NEWNS
) < 0)
3671 bdev
= storage_init(c
->lxc_conf
);
3675 if (strcmp(bdev
->type
, "dir") != 0) {
3676 if (unshare(CLONE_NEWNS
) < 0) {
3677 ERROR("error unsharing mounts");
3682 if (detect_shared_rootfs()) {
3683 if (mount(NULL
, "/", NULL
, MS_SLAVE
|MS_REC
, NULL
)) {
3684 SYSERROR("Failed to make / rslave");
3685 ERROR("Continuing...");
3689 if (bdev
->ops
->mount(bdev
) < 0) {
3693 } else { /* TODO come up with a better way */
3695 bdev
->dest
= strdup(bdev
->src
);
3698 if (!lxc_list_empty(&conf
->hooks
[LXCHOOK_CLONE
])) {
3699 /* Start of environment variable setup for hooks */
3700 if (c0
->name
&& setenv("LXC_SRC_NAME", c0
->name
, 1))
3701 SYSERROR("failed to set environment variable for source container name");
3703 if (setenv("LXC_NAME", c
->name
, 1))
3704 SYSERROR("failed to set environment variable for container name");
3706 if (conf
->rcfile
&& setenv("LXC_CONFIG_FILE", conf
->rcfile
, 1))
3707 SYSERROR("failed to set environment variable for config path");
3709 if (bdev
->dest
&& setenv("LXC_ROOTFS_MOUNT", bdev
->dest
, 1))
3710 SYSERROR("failed to set environment variable for rootfs mount");
3712 if (conf
->rootfs
.path
&& setenv("LXC_ROOTFS_PATH", conf
->rootfs
.path
, 1))
3713 SYSERROR("failed to set environment variable for rootfs mount");
3715 if (run_lxc_hooks(c
->name
, "clone", conf
, hookargs
)) {
3716 ERROR("Error executing clone hook for %s", c
->name
);
3722 if (!(flags
& LXC_CLONE_KEEPNAME
)) {
3723 ret
= snprintf(path
, PATH_MAX
, "%s/etc/hostname", bdev
->dest
);
3726 if (ret
< 0 || ret
>= PATH_MAX
)
3729 if (!file_exists(path
))
3732 if (!(fout
= fopen(path
, "w"))) {
3733 SYSERROR("unable to open %s: ignoring", path
);
3737 if (fprintf(fout
, "%s", c
->name
) < 0) {
3742 if (fclose(fout
) < 0)
3751 static int clone_update_rootfs_wrapper(void *data
)
3753 struct clone_update_data
*arg
= (struct clone_update_data
*) data
;
3754 return clone_update_rootfs(arg
);
3758 * We want to support:
3759 sudo lxc-clone -o o1 -n n1 -s -L|-fssize fssize -v|--vgname vgname \
3760 -p|--lvprefix lvprefix -t|--fstype fstype -B backingstore
3762 -s [ implies overlay]
3765 only rootfs gets converted (copied/snapshotted) on clone.
3768 static int create_file_dirname(char *path
, struct lxc_conf
*conf
)
3770 char *p
= strrchr(path
, '/');
3777 ret
= do_create_container_dir(path
, conf
);
3783 static struct lxc_container
*do_lxcapi_clone(struct lxc_container
*c
, const char *newname
,
3784 const char *lxcpath
, int flags
,
3785 const char *bdevtype
, const char *bdevdata
, uint64_t newsize
,
3788 char newpath
[PATH_MAX
];
3790 struct clone_update_data data
;
3791 size_t saved_unexp_len
;
3793 int storage_copied
= 0;
3794 char *origroot
= NULL
, *saved_unexp_conf
= NULL
;
3795 struct lxc_container
*c2
= NULL
;
3797 if (!c
|| !do_lxcapi_is_defined(c
))
3800 if (container_mem_lock(c
))
3803 if (!is_stopped(c
)) {
3804 ERROR("error: Original container (%s) is running", c
->name
);
3808 /* Make sure the container doesn't yet exist. */
3813 lxcpath
= do_lxcapi_get_config_path(c
);
3815 ret
= snprintf(newpath
, PATH_MAX
, "%s/%s/config", lxcpath
, newname
);
3816 if (ret
< 0 || ret
>= PATH_MAX
) {
3817 SYSERROR("clone: failed making config pathname");
3821 if (file_exists(newpath
)) {
3822 ERROR("error: clone: %s exists", newpath
);
3826 ret
= create_file_dirname(newpath
, c
->lxc_conf
);
3827 if (ret
< 0 && errno
!= EEXIST
) {
3828 ERROR("Error creating container dir for %s", newpath
);
3832 /* Copy the configuration. Tweak it as needed. */
3833 if (c
->lxc_conf
->rootfs
.path
) {
3834 origroot
= c
->lxc_conf
->rootfs
.path
;
3835 c
->lxc_conf
->rootfs
.path
= NULL
;
3838 fd
= open(newpath
, O_WRONLY
| O_CREAT
| O_CLOEXEC
,
3839 S_IRUSR
| S_IWUSR
| S_IRGRP
| S_IWGRP
);
3841 SYSERROR("Failed to open \"%s\"", newpath
);
3845 saved_unexp_conf
= c
->lxc_conf
->unexpanded_config
;
3846 saved_unexp_len
= c
->lxc_conf
->unexpanded_len
;
3847 c
->lxc_conf
->unexpanded_config
= strdup(saved_unexp_conf
);
3848 if (!c
->lxc_conf
->unexpanded_config
) {
3853 clear_unexp_config_line(c
->lxc_conf
, "lxc.rootfs.path", false);
3854 write_config(fd
, c
->lxc_conf
);
3857 c
->lxc_conf
->rootfs
.path
= origroot
;
3859 free(c
->lxc_conf
->unexpanded_config
);
3860 c
->lxc_conf
->unexpanded_config
= saved_unexp_conf
;
3861 saved_unexp_conf
= NULL
;
3862 c
->lxc_conf
->unexpanded_len
= saved_unexp_len
;
3864 ret
= snprintf(newpath
, PATH_MAX
, "%s/%s/rootfs", lxcpath
, newname
);
3865 if (ret
< 0 || ret
>= PATH_MAX
) {
3866 SYSERROR("clone: failed making rootfs pathname");
3870 ret
= mkdir(newpath
, 0755);
3872 /* For an overlay container the rootfs is considered immutable
3873 * and will not have been removed when restoring from a
3876 if (errno
!= ENOENT
&&
3877 !(flags
& LXC_STORAGE_INTERNAL_OVERLAY_RESTORE
)) {
3878 SYSERROR("Failed to create directory \"%s\"", newpath
);
3883 if (am_guest_unpriv()) {
3884 if (chown_mapped_root(newpath
, c
->lxc_conf
) < 0) {
3885 ERROR("Error chowning %s to container root", newpath
);
3890 c2
= lxc_container_new(newname
, lxcpath
);
3892 ERROR("clone: failed to create new container (%s %s)", newname
,
3897 /* copy/snapshot rootfs's */
3898 ret
= copy_storage(c
, c2
, bdevtype
, flags
, bdevdata
, newsize
);
3902 /* update utsname */
3903 if (!(flags
& LXC_CLONE_KEEPNAME
)) {
3904 clear_unexp_config_line(c2
->lxc_conf
, "lxc.utsname", false);
3905 clear_unexp_config_line(c2
->lxc_conf
, "lxc.uts.name", false);
3907 if (!do_set_config_item_locked(c2
, "lxc.uts.name", newname
)) {
3908 ERROR("Error setting new hostname");
3914 ret
= copyhooks(c
, c2
);
3916 ERROR("error copying hooks");
3920 if (copy_fstab(c
, c2
) < 0) {
3921 ERROR("error copying fstab");
3925 /* update macaddrs */
3926 if (!(flags
& LXC_CLONE_KEEPMACADDR
)) {
3927 if (!network_new_hwaddrs(c2
->lxc_conf
)) {
3928 ERROR("Error updating mac addresses");
3933 /* Update absolute paths for overlay mount directories. */
3934 if (ovl_update_abs_paths(c2
->lxc_conf
, c
->config_path
, c
->name
, lxcpath
, newname
) < 0)
3937 /* We've now successfully created c2's storage, so clear it out if we
3942 if (!c2
->save_config(c2
, NULL
))
3945 if ((pid
= fork()) < 0) {
3951 ret
= wait_for_pid(pid
);
3955 container_mem_unlock(c
);
3962 data
.hookargs
= hookargs
;
3964 if (am_guest_unpriv())
3965 ret
= userns_exec_full(c
->lxc_conf
, clone_update_rootfs_wrapper
,
3966 &data
, "clone_update_rootfs_wrapper");
3968 ret
= clone_update_rootfs(&data
);
3970 _exit(EXIT_FAILURE
);
3972 container_mem_unlock(c
);
3973 _exit(EXIT_SUCCESS
);
3976 container_mem_unlock(c
);
3978 if (!storage_copied
)
3979 c2
->lxc_conf
->rootfs
.path
= NULL
;
3982 lxc_container_put(c2
);
3988 static struct lxc_container
*lxcapi_clone(struct lxc_container
*c
, const char *newname
,
3989 const char *lxcpath
, int flags
,
3990 const char *bdevtype
, const char *bdevdata
, uint64_t newsize
,
3993 struct lxc_container
* ret
;
3995 current_config
= c
? c
->lxc_conf
: NULL
;
3996 ret
= do_lxcapi_clone(c
, newname
, lxcpath
, flags
, bdevtype
, bdevdata
, newsize
, hookargs
);
3997 current_config
= NULL
;
4002 static bool do_lxcapi_rename(struct lxc_container
*c
, const char *newname
)
4004 struct lxc_storage
*bdev
;
4005 struct lxc_container
*newc
;
4007 if (!c
|| !c
->name
|| !c
->config_path
|| !c
->lxc_conf
)
4010 if (has_fs_snapshots(c
) || has_snapshots(c
)) {
4011 ERROR("Renaming a container with snapshots is not supported");
4015 bdev
= storage_init(c
->lxc_conf
);
4017 ERROR("Failed to find original backing store type");
4021 newc
= lxcapi_clone(c
, newname
, c
->config_path
, LXC_CLONE_KEEPMACADDR
, NULL
, bdev
->type
, 0, NULL
);
4024 lxc_container_put(newc
);
4028 if (newc
&& lxcapi_is_defined(newc
))
4029 lxc_container_put(newc
);
4031 if (!container_destroy(c
, NULL
)) {
4032 ERROR("Could not destroy existing container %s", c
->name
);
4039 WRAP_API_1(bool, lxcapi_rename
, const char *)
4041 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
)
4048 current_config
= c
->lxc_conf
;
4050 ret
= lxc_attach(c
->name
, c
->config_path
, exec_function
, exec_payload
, options
, attached_process
);
4051 current_config
= NULL
;
4055 static int do_lxcapi_attach_run_wait(struct lxc_container
*c
, lxc_attach_options_t
*options
, const char *program
, const char * const argv
[])
4057 lxc_attach_command_t command
;
4064 command
.program
= (char*)program
;
4065 command
.argv
= (char**)argv
;
4067 r
= lxc_attach(c
->name
, c
->config_path
, lxc_attach_run_command
, &command
, options
, &pid
);
4073 return lxc_wait_for_pid_status(pid
);
4076 static int lxcapi_attach_run_wait(struct lxc_container
*c
, lxc_attach_options_t
*options
, const char *program
, const char * const argv
[])
4080 current_config
= c
? c
->lxc_conf
: NULL
;
4081 ret
= do_lxcapi_attach_run_wait(c
, options
, program
, argv
);
4082 current_config
= NULL
;
4087 static int get_next_index(const char *lxcpath
, char *cname
)
4093 fname
= alloca(strlen(lxcpath
) + 20);
4096 sprintf(fname
, "%s/snap%d", lxcpath
, i
);
4098 ret
= stat(fname
, &sb
);
4106 static bool get_snappath_dir(struct lxc_container
*c
, char *snappath
)
4111 * If the old style snapshot path exists, use it
4112 * /var/lib/lxc -> /var/lib/lxcsnaps
4114 ret
= snprintf(snappath
, PATH_MAX
, "%ssnaps", c
->config_path
);
4115 if (ret
< 0 || ret
>= PATH_MAX
)
4118 if (dir_exists(snappath
)) {
4119 ret
= snprintf(snappath
, PATH_MAX
, "%ssnaps/%s", c
->config_path
, c
->name
);
4120 if (ret
< 0 || ret
>= PATH_MAX
)
4127 * Use the new style path
4128 * /var/lib/lxc -> /var/lib/lxc + c->name + /snaps + \0
4130 ret
= snprintf(snappath
, PATH_MAX
, "%s/%s/snaps", c
->config_path
, c
->name
);
4131 if (ret
< 0 || ret
>= PATH_MAX
)
4137 static int do_lxcapi_snapshot(struct lxc_container
*c
, const char *commentfile
)
4142 struct lxc_container
*c2
;
4143 char snappath
[PATH_MAX
], newname
[20];
4147 if (!c
|| !lxcapi_is_defined(c
))
4150 if (!storage_can_backup(c
->lxc_conf
)) {
4151 ERROR("%s's backing store cannot be backed up", c
->name
);
4152 ERROR("Your container must use another backing store type");
4156 if (!get_snappath_dir(c
, snappath
))
4159 i
= get_next_index(snappath
, c
->name
);
4161 if (mkdir_p(snappath
, 0755) < 0) {
4162 ERROR("Failed to create snapshot directory %s", snappath
);
4166 ret
= snprintf(newname
, 20, "snap%d", i
);
4167 if (ret
< 0 || ret
>= 20)
4171 * We pass LXC_CLONE_SNAPSHOT to make sure that a rdepends file entry is
4172 * created in the original container
4174 flags
= LXC_CLONE_SNAPSHOT
| LXC_CLONE_KEEPMACADDR
| LXC_CLONE_KEEPNAME
|
4175 LXC_CLONE_KEEPBDEVTYPE
| LXC_CLONE_MAYBE_SNAPSHOT
;
4176 if (storage_is_dir(c
->lxc_conf
)) {
4177 ERROR("Snapshot of directory-backed container requested");
4178 ERROR("Making a copy-clone. If you do want snapshots, then");
4179 ERROR("please create overlay clone first, snapshot that");
4180 ERROR("and keep the original container pristine");
4181 flags
&= ~LXC_CLONE_SNAPSHOT
| LXC_CLONE_MAYBE_SNAPSHOT
;
4184 c2
= do_lxcapi_clone(c
, newname
, snappath
, flags
, NULL
, NULL
, 0, NULL
);
4186 ERROR("Failed to clone of %s:%s", c
->config_path
, c
->name
);
4190 lxc_container_put(c2
);
4192 /* Now write down the creation time. */
4195 if (!localtime_r(&timer
, &tm_info
)) {
4196 ERROR("Failed to get localtime");
4200 strftime(buffer
, 25, "%Y:%m:%d %H:%M:%S", &tm_info
);
4202 char *dfnam
= alloca(strlen(snappath
) + strlen(newname
) + 5);
4203 sprintf(dfnam
, "%s/%s/ts", snappath
, newname
);
4204 f
= fopen(dfnam
, "w");
4206 ERROR("Failed to open %s", dfnam
);
4210 if (fprintf(f
, "%s", buffer
) < 0) {
4211 SYSERROR("Writing timestamp");
4218 SYSERROR("Writing timestamp");
4223 /* $p / $name / comment \0 */
4224 int len
= strlen(snappath
) + strlen(newname
) + 10;
4225 char *path
= alloca(len
);
4227 sprintf(path
, "%s/%s/comment", snappath
, newname
);
4228 return copy_file(commentfile
, path
) < 0 ? -1 : i
;
4234 WRAP_API_1(int, lxcapi_snapshot
, const char *)
4236 static void lxcsnap_free(struct lxc_snapshot
*s
)
4239 free(s
->comment_pathname
);
4244 static char *get_snapcomment_path(char* snappath
, char *name
)
4246 /* $snappath/$name/comment */
4247 int ret
, len
= strlen(snappath
) + strlen(name
) + 10;
4248 char *s
= malloc(len
);
4251 ret
= snprintf(s
, len
, "%s/%s/comment", snappath
, name
);
4252 if (ret
< 0 || ret
>= len
) {
4261 static char *get_timestamp(char* snappath
, char *name
)
4263 char path
[PATH_MAX
], *s
= NULL
;
4267 ret
= snprintf(path
, PATH_MAX
, "%s/%s/ts", snappath
, name
);
4268 if (ret
< 0 || ret
>= PATH_MAX
)
4271 fin
= fopen(path
, "r");
4275 (void) fseek(fin
, 0, SEEK_END
);
4277 (void) fseek(fin
, 0, SEEK_SET
);
4282 if (fread(s
, 1, len
, fin
) != len
) {
4283 SYSERROR("reading timestamp");
4294 static int do_lxcapi_snapshot_list(struct lxc_container
*c
, struct lxc_snapshot
**ret_snaps
)
4296 char snappath
[PATH_MAX
], path2
[PATH_MAX
];
4298 struct dirent
*direntp
;
4299 struct lxc_snapshot
*snaps
=NULL
, *nsnaps
;
4302 if (!c
|| !lxcapi_is_defined(c
))
4305 if (!get_snappath_dir(c
, snappath
)) {
4306 ERROR("path name too long");
4310 dir
= opendir(snappath
);
4312 INFO("Failed to open %s - assuming no snapshots", snappath
);
4316 while ((direntp
= readdir(dir
))) {
4317 if (!strcmp(direntp
->d_name
, "."))
4320 if (!strcmp(direntp
->d_name
, ".."))
4323 ret
= snprintf(path2
, PATH_MAX
, "%s/%s/config", snappath
, direntp
->d_name
);
4324 if (ret
< 0 || ret
>= PATH_MAX
) {
4325 ERROR("pathname too long");
4329 if (!file_exists(path2
))
4332 nsnaps
= realloc(snaps
, (count
+ 1)*sizeof(*snaps
));
4334 SYSERROR("Out of memory");
4339 snaps
[count
].free
= lxcsnap_free
;
4340 snaps
[count
].name
= strdup(direntp
->d_name
);
4341 if (!snaps
[count
].name
)
4344 snaps
[count
].lxcpath
= strdup(snappath
);
4345 if (!snaps
[count
].lxcpath
) {
4346 free(snaps
[count
].name
);
4350 snaps
[count
].comment_pathname
= get_snapcomment_path(snappath
, direntp
->d_name
);
4351 snaps
[count
].timestamp
= get_timestamp(snappath
, direntp
->d_name
);
4356 WARN("Failed to close directory");
4365 for (i
=0; i
<count
; i
++)
4366 lxcsnap_free(&snaps
[i
]);
4372 WARN("Failed to close directory");
4377 WRAP_API_1(int, lxcapi_snapshot_list
, struct lxc_snapshot
**)
4379 static bool do_lxcapi_snapshot_restore(struct lxc_container
*c
, const char *snapname
, const char *newname
)
4381 char clonelxcpath
[PATH_MAX
];
4383 struct lxc_container
*snap
, *rest
;
4384 struct lxc_storage
*bdev
;
4387 if (!c
|| !c
->name
|| !c
->config_path
)
4390 if (has_fs_snapshots(c
)) {
4391 ERROR("container rootfs has dependent snapshots");
4395 bdev
= storage_init(c
->lxc_conf
);
4397 ERROR("Failed to find original backing store type");
4401 /* For an overlay container the rootfs is considered immutable
4402 * and cannot be removed when restoring from a snapshot. We pass this
4403 * internal flag along to communicate this to various parts of the
4406 if (!strcmp(bdev
->type
, "overlay") || !strcmp(bdev
->type
, "overlayfs"))
4407 bdev
->flags
|= LXC_STORAGE_INTERNAL_OVERLAY_RESTORE
;
4412 if (!get_snappath_dir(c
, clonelxcpath
)) {
4416 /* how should we lock this? */
4418 snap
= lxc_container_new(snapname
, clonelxcpath
);
4419 if (!snap
|| !lxcapi_is_defined(snap
)) {
4420 ERROR("Could not open snapshot %s", snapname
);
4423 lxc_container_put(snap
);
4429 if (!strcmp(c
->name
, newname
)) {
4430 if (!container_destroy(c
, bdev
)) {
4431 ERROR("Could not destroy existing container %s", newname
);
4432 lxc_container_put(snap
);
4438 if (strcmp(bdev
->type
, "dir") != 0 && strcmp(bdev
->type
, "loop") != 0)
4439 flags
= LXC_CLONE_SNAPSHOT
| LXC_CLONE_MAYBE_SNAPSHOT
;
4441 if (!strcmp(bdev
->type
, "overlay") || !strcmp(bdev
->type
, "overlayfs"))
4442 flags
|= LXC_STORAGE_INTERNAL_OVERLAY_RESTORE
;
4444 rest
= lxcapi_clone(snap
, newname
, c
->config_path
, flags
, bdev
->type
,
4447 if (rest
&& lxcapi_is_defined(rest
))
4451 lxc_container_put(rest
);
4453 lxc_container_put(snap
);
4457 WRAP_API_2(bool, lxcapi_snapshot_restore
, const char *, const char *)
4459 static bool do_snapshot_destroy(const char *snapname
, const char *clonelxcpath
)
4461 struct lxc_container
*snap
= NULL
;
4464 snap
= lxc_container_new(snapname
, clonelxcpath
);
4466 ERROR("Could not find snapshot %s", snapname
);
4470 if (!do_lxcapi_destroy(snap
)) {
4471 ERROR("Could not destroy snapshot %s", snapname
);
4479 lxc_container_put(snap
);
4484 static bool remove_all_snapshots(const char *path
)
4487 struct dirent
*direntp
;
4490 dir
= opendir(path
);
4492 SYSERROR("opendir on snapshot path %s", path
);
4496 while ((direntp
= readdir(dir
))) {
4497 if (!strcmp(direntp
->d_name
, "."))
4500 if (!strcmp(direntp
->d_name
, ".."))
4503 if (!do_snapshot_destroy(direntp
->d_name
, path
)) {
4512 SYSERROR("Error removing directory %s", path
);
4517 static bool do_lxcapi_snapshot_destroy(struct lxc_container
*c
, const char *snapname
)
4519 char clonelxcpath
[PATH_MAX
];
4521 if (!c
|| !c
->name
|| !c
->config_path
|| !snapname
)
4524 if (!get_snappath_dir(c
, clonelxcpath
))
4527 return do_snapshot_destroy(snapname
, clonelxcpath
);
4530 WRAP_API_1(bool, lxcapi_snapshot_destroy
, const char *)
4532 static bool do_lxcapi_snapshot_destroy_all(struct lxc_container
*c
)
4534 char clonelxcpath
[PATH_MAX
];
4536 if (!c
|| !c
->name
|| !c
->config_path
)
4539 if (!get_snappath_dir(c
, clonelxcpath
))
4542 return remove_all_snapshots(clonelxcpath
);
4545 WRAP_API(bool, lxcapi_snapshot_destroy_all
)
4547 static bool do_lxcapi_may_control(struct lxc_container
*c
)
4552 return lxc_try_cmd(c
->name
, c
->config_path
) == 0;
4555 WRAP_API(bool, lxcapi_may_control
)
4557 static bool do_add_remove_node(pid_t init_pid
, const char *path
, bool add
,
4563 char chrootpath
[PATH_MAX
];
4564 char *directory_path
= NULL
;
4568 SYSERROR("Failed to fork()");
4573 ret
= wait_for_pid(pid
);
4575 ERROR("Failed to create device node");
4582 /* prepare the path */
4583 ret
= snprintf(chrootpath
, PATH_MAX
, "/proc/%d/root", init_pid
);
4584 if (ret
< 0 || ret
>= PATH_MAX
)
4587 ret
= chroot(chrootpath
);
4589 _exit(EXIT_FAILURE
);
4593 _exit(EXIT_FAILURE
);
4595 /* remove path if it exists */
4596 ret
= faccessat(AT_FDCWD
, path
, F_OK
, AT_SYMLINK_NOFOLLOW
);
4600 SYSERROR("Failed to remove \"%s\"", path
);
4601 _exit(EXIT_FAILURE
);
4606 _exit(EXIT_SUCCESS
);
4608 /* create any missing directories */
4611 _exit(EXIT_FAILURE
);
4613 directory_path
= dirname(tmp
);
4614 ret
= mkdir_p(directory_path
, 0755);
4615 if (ret
< 0 && errno
!= EEXIST
) {
4616 SYSERROR("Failed to create path \"%s\"", directory_path
);
4618 _exit(EXIT_FAILURE
);
4621 /* create the device node */
4622 ret
= mknod(path
, st
->st_mode
, st
->st_rdev
);
4625 SYSERROR("Failed to create device node at \"%s\"", path
);
4626 _exit(EXIT_FAILURE
);
4629 _exit(EXIT_SUCCESS
);
4632 static bool add_remove_device_node(struct lxc_container
*c
, const char *src_path
, const char *dest_path
, bool add
)
4636 char value
[LXC_MAX_BUFFER
];
4639 /* make sure container is running */
4640 if (!do_lxcapi_is_running(c
)) {
4641 ERROR("container is not running");
4645 /* use src_path if dest_path is NULL otherwise use dest_path */
4646 p
= dest_path
? dest_path
: src_path
;
4648 /* make sure we can access p */
4649 if(access(p
, F_OK
) < 0 || stat(p
, &st
) < 0)
4652 /* continue if path is character device or block device */
4653 if (S_ISCHR(st
.st_mode
))
4654 ret
= snprintf(value
, LXC_MAX_BUFFER
, "c %d:%d rwm", major(st
.st_rdev
), minor(st
.st_rdev
));
4655 else if (S_ISBLK(st
.st_mode
))
4656 ret
= snprintf(value
, LXC_MAX_BUFFER
, "b %d:%d rwm", major(st
.st_rdev
), minor(st
.st_rdev
));
4660 /* check snprintf return code */
4661 if (ret
< 0 || ret
>= LXC_MAX_BUFFER
)
4664 if (!do_add_remove_node(do_lxcapi_init_pid(c
), p
, add
, &st
))
4667 /* add or remove device to/from cgroup access list */
4669 if (!do_lxcapi_set_cgroup_item(c
, "devices.allow", value
)) {
4670 ERROR("set_cgroup_item failed while adding the device node");
4674 if (!do_lxcapi_set_cgroup_item(c
, "devices.deny", value
)) {
4675 ERROR("set_cgroup_item failed while removing the device node");
4683 static bool do_lxcapi_add_device_node(struct lxc_container
*c
, const char *src_path
, const char *dest_path
)
4685 // cannot mknod if we're not privileged wrt init_user_ns
4686 if (am_host_unpriv()) {
4687 ERROR(LXC_UNPRIV_EOPNOTSUPP
, __FUNCTION__
);
4691 return add_remove_device_node(c
, src_path
, dest_path
, true);
4694 WRAP_API_2(bool, lxcapi_add_device_node
, const char *, const char *)
4696 static bool do_lxcapi_remove_device_node(struct lxc_container
*c
, const char *src_path
, const char *dest_path
)
4698 if (am_guest_unpriv()) {
4699 ERROR(LXC_UNPRIV_EOPNOTSUPP
, __FUNCTION__
);
4703 return add_remove_device_node(c
, src_path
, dest_path
, false);
4706 WRAP_API_2(bool, lxcapi_remove_device_node
, const char *, const char *)
4708 static bool do_lxcapi_attach_interface(struct lxc_container
*c
,
4710 const char *dst_ifname
)
4715 if (am_guest_unpriv()) {
4716 ERROR(LXC_UNPRIV_EOPNOTSUPP
, __FUNCTION__
);
4721 ERROR("No source interface name given");
4725 ret
= lxc_netdev_isup(ifname
);
4727 /* netdev of ifname is up. */
4728 ret
= lxc_netdev_down(ifname
);
4733 init_pid
= do_lxcapi_init_pid(c
);
4734 ret
= lxc_netdev_move_by_name(ifname
, init_pid
, dst_ifname
);
4738 INFO("Moved network device \"%s\" to network namespace of %d", ifname
, init_pid
);
4745 WRAP_API_2(bool, lxcapi_attach_interface
, const char *, const char *)
4747 static bool do_lxcapi_detach_interface(struct lxc_container
*c
,
4749 const char *dst_ifname
)
4752 pid_t pid
, pid_outside
;
4755 * TODO - if this is a physical device, then we need am_host_unpriv.
4756 * But for other types guest privilege suffices.
4758 if (am_guest_unpriv()) {
4759 ERROR(LXC_UNPRIV_EOPNOTSUPP
, __FUNCTION__
);
4764 ERROR("No source interface name given");
4768 pid_outside
= lxc_raw_getpid();
4771 ERROR("Failed to fork");
4775 if (pid
== 0) { /* child */
4778 init_pid
= do_lxcapi_init_pid(c
);
4779 if (!switch_to_ns(init_pid
, "net")) {
4780 ERROR("Failed to enter network namespace");
4781 _exit(EXIT_FAILURE
);
4784 ret
= lxc_netdev_isup(ifname
);
4786 ERROR("Failed to determine whether network device \"%s\" is up", ifname
);
4787 _exit(EXIT_FAILURE
);
4790 /* netdev of ifname is up. */
4792 ret
= lxc_netdev_down(ifname
);
4794 ERROR("Failed to set network device \"%s\" down", ifname
);
4795 _exit(EXIT_FAILURE
);
4799 ret
= lxc_netdev_move_by_name(ifname
, pid_outside
, dst_ifname
);
4800 /* -EINVAL means there is no netdev named as ifname. */
4803 ERROR("Network device \"%s\" not found", ifname
);
4805 ERROR("Failed to remove network device \"%s\"", ifname
);
4807 _exit(EXIT_FAILURE
);
4810 _exit(EXIT_SUCCESS
);
4813 ret
= wait_for_pid(pid
);
4817 INFO("Moved network device \"%s\" to network namespace of %d", ifname
, pid_outside
);
4821 WRAP_API_2(bool, lxcapi_detach_interface
, const char *, const char *)
4823 static int do_lxcapi_migrate(struct lxc_container
*c
, unsigned int cmd
,
4824 struct migrate_opts
*opts
, unsigned int size
)
4827 struct migrate_opts
*valid_opts
= opts
;
4828 uint64_t features_to_check
= 0;
4830 /* If the caller has a bigger (newer) struct migrate_opts, let's make
4831 * sure that the stuff on the end is zero, i.e. that they didn't ask us
4832 * to do anything special.
4834 if (size
> sizeof(*opts
)) {
4835 unsigned char *addr
;
4838 addr
= (void *)opts
+ sizeof(*opts
);
4839 end
= (void *)opts
+ size
;
4841 for (; addr
< end
; addr
++)
4846 /* If the caller has a smaller struct, let's zero out the end for them
4847 * so we don't accidentally use bits of it that they didn't know about
4850 if (size
< sizeof(*opts
)) {
4851 valid_opts
= malloc(sizeof(*opts
));
4855 memset(valid_opts
, 0, sizeof(*opts
));
4856 memcpy(valid_opts
, opts
, size
);
4860 case MIGRATE_PRE_DUMP
:
4861 if (!do_lxcapi_is_running(c
)) {
4862 ERROR("container is not running");
4866 ret
= !__criu_pre_dump(c
, valid_opts
);
4869 if (!do_lxcapi_is_running(c
)) {
4870 ERROR("container is not running");
4874 ret
= !__criu_dump(c
, valid_opts
);
4876 case MIGRATE_RESTORE
:
4877 if (do_lxcapi_is_running(c
)) {
4878 ERROR("container is already running");
4882 ret
= !__criu_restore(c
, valid_opts
);
4884 case MIGRATE_FEATURE_CHECK
:
4885 features_to_check
= valid_opts
->features_to_check
;
4886 ret
= !__criu_check_feature(&features_to_check
);
4888 /* Something went wrong. Let's let the caller
4889 * know which feature checks failed. */
4890 valid_opts
->features_to_check
= features_to_check
;
4894 ERROR("invalid migrate command %u", cmd
);
4899 if (size
< sizeof(*opts
))
4905 WRAP_API_3(int, lxcapi_migrate
, unsigned int, struct migrate_opts
*, unsigned int)
4907 static bool do_lxcapi_checkpoint(struct lxc_container
*c
, char *directory
, bool stop
, bool verbose
)
4909 struct migrate_opts opts
;
4911 memset(&opts
, 0, sizeof(opts
));
4913 opts
.directory
= directory
;
4915 opts
.verbose
= verbose
;
4917 return !do_lxcapi_migrate(c
, MIGRATE_DUMP
, &opts
, sizeof(opts
));
4920 WRAP_API_3(bool, lxcapi_checkpoint
, char *, bool, bool)
4922 static bool do_lxcapi_restore(struct lxc_container
*c
, char *directory
, bool verbose
)
4924 struct migrate_opts opts
;
4926 memset(&opts
, 0, sizeof(opts
));
4928 opts
.directory
= directory
;
4929 opts
.verbose
= verbose
;
4931 return !do_lxcapi_migrate(c
, MIGRATE_RESTORE
, &opts
, sizeof(opts
));
4934 WRAP_API_2(bool, lxcapi_restore
, char *, bool)
4936 /* @st_mode is the st_mode field of the stat(source) return struct */
4937 static int create_mount_target(const char *dest
, mode_t st_mode
)
4939 char *dirdup
, *destdirname
;
4942 dirdup
= strdup(dest
);
4944 SYSERROR("Failed to duplicate target name \"%s\"", dest
);
4947 destdirname
= dirname(dirdup
);
4949 ret
= mkdir_p(destdirname
, 0755);
4951 SYSERROR("Failed to create \"%s\"", destdirname
);
4959 if (S_ISDIR(st_mode
))
4960 ret
= mkdir(dest
, 0000);
4962 ret
= mknod(dest
, S_IFREG
| 0000, 0);
4964 SYSERROR("Failed to create mount target \"%s\"", dest
);
4971 static int do_lxcapi_mount(struct lxc_container
*c
, const char *source
,
4972 const char *target
, const char *filesystemtype
,
4973 unsigned long mountflags
, const void *data
,
4974 struct lxc_mount
*mnt
)
4977 char template[PATH_MAX
], path
[PATH_MAX
];
4978 pid_t pid
, init_pid
;
4980 int ret
= -1, fd
= -EBADF
;
4982 if (!c
|| !c
->lxc_conf
) {
4983 ERROR("Container or configuration is NULL");
4987 if (!c
->lxc_conf
->shmount
.path_host
) {
4988 ERROR("Host path to shared mountpoint must be specified in the config\n");
4992 ret
= snprintf(template, sizeof(template), "%s/.lxcmount_XXXXXX", c
->lxc_conf
->shmount
.path_host
);
4993 if (ret
< 0 || (size_t)ret
>= sizeof(template)) {
4994 SYSERROR("Error writing shmounts tempdir name");
4998 /* Create a temporary file / dir under the shared mountpoint */
4999 if (!source
|| strcmp(source
, "") == 0) {
5000 /* If source is not specified, maybe we want to mount a filesystem? */
5001 sb
.st_mode
= S_IFDIR
;
5003 ret
= stat(source
, &sb
);
5005 SYSERROR("Error getting stat info about the source \"%s\"", source
);
5010 if (S_ISDIR(sb
.st_mode
)) {
5011 sret
= mkdtemp(template);
5013 SYSERROR("Could not create shmounts temporary dir");
5017 fd
= lxc_make_tmpfile(template, false);
5019 SYSERROR("Could not create shmounts temporary file");
5027 SYSERROR("Could not fork");
5033 ret
= mount(source
, template, filesystemtype
, mountflags
, data
);
5035 SYSERROR("Failed to mount onto \"%s\"", template);
5036 _exit(EXIT_FAILURE
);
5038 TRACE("Mounted \"%s\" onto \"%s\"", source
, template);
5040 init_pid
= do_lxcapi_init_pid(c
);
5042 ERROR("Failed to obtain container's init pid");
5043 _exit(EXIT_FAILURE
);
5046 /* Enter the container namespaces */
5047 if (!lxc_list_empty(&c
->lxc_conf
->id_map
)) {
5048 if (!switch_to_ns(init_pid
, "user")){
5049 ERROR("Failed to enter user namespace");
5050 _exit(EXIT_FAILURE
);
5054 if (!switch_to_ns(init_pid
, "mnt")) {
5055 ERROR("Failed to enter mount namespace");
5056 _exit(EXIT_FAILURE
);
5059 ret
= create_mount_target(target
, sb
.st_mode
);
5061 _exit(EXIT_FAILURE
);
5062 TRACE("Created mount target \"%s\"", target
);
5064 suff
= strrchr(template, '/');
5066 _exit(EXIT_FAILURE
);
5068 ret
= snprintf(path
, sizeof(path
), "%s%s", c
->lxc_conf
->shmount
.path_cont
, suff
);
5069 if (ret
< 0 || (size_t)ret
>= sizeof(path
)) {
5070 SYSERROR("Error writing container mountpoint name");
5071 _exit(EXIT_FAILURE
);
5074 ret
= mount(path
, target
, NULL
, MS_MOVE
| MS_REC
, NULL
);
5076 SYSERROR("Failed to move the mount from \"%s\" to \"%s\"", path
, target
);
5077 _exit(EXIT_FAILURE
);
5079 TRACE("Moved mount from \"%s\" to \"%s\"", path
, target
);
5081 _exit(EXIT_SUCCESS
);
5084 ret
= wait_for_pid(pid
);
5086 SYSERROR("Wait for the child with pid %ld failed", (long) pid
);
5092 (void)umount2(template, MNT_DETACH
);
5093 (void)unlink(template);
5102 WRAP_API_6(int, lxcapi_mount
, const char *, const char *, const char *,
5103 unsigned long, const void *, struct lxc_mount
*)
5105 static int do_lxcapi_umount(struct lxc_container
*c
, const char *target
,
5106 unsigned long flags
, struct lxc_mount
*mnt
)
5108 pid_t pid
, init_pid
;
5111 if (!c
|| !c
->lxc_conf
) {
5112 ERROR("Container or configuration is NULL");
5119 SYSERROR("Could not fork");
5124 init_pid
= do_lxcapi_init_pid(c
);
5126 ERROR("Failed to obtain container's init pid");
5127 _exit(EXIT_FAILURE
);
5130 /* Enter the container namespaces */
5131 if (!lxc_list_empty(&c
->lxc_conf
->id_map
)) {
5132 if (!switch_to_ns(init_pid
, "user")) {
5133 ERROR("Failed to enter user namespace");
5134 _exit(EXIT_FAILURE
);
5138 if (!switch_to_ns(init_pid
, "mnt")) {
5139 ERROR("Failed to enter mount namespace");
5140 _exit(EXIT_FAILURE
);
5143 /* Do the unmount */
5144 ret
= umount2(target
, flags
);
5146 SYSERROR("Failed to umount \"%s\"", target
);
5147 _exit(EXIT_FAILURE
);
5150 _exit(EXIT_SUCCESS
);
5153 ret
= wait_for_pid(pid
);
5155 SYSERROR("Wait for the child with pid %ld failed", (long)pid
);
5162 WRAP_API_3(int, lxcapi_umount
, const char *, unsigned long, struct lxc_mount
*)
5164 static int lxcapi_attach_run_waitl(struct lxc_container
*c
, lxc_attach_options_t
*options
, const char *program
, const char *arg
, ...)
5173 current_config
= c
->lxc_conf
;
5176 argv
= lxc_va_arg_list_to_argv_const(ap
, 1);
5180 ERROR("Memory allocation error.");
5186 ret
= do_lxcapi_attach_run_wait(c
, options
, program
, (const char * const *)argv
);
5190 current_config
= NULL
;
5194 struct lxc_container
*lxc_container_new(const char *name
, const char *configpath
)
5196 struct lxc_container
*c
;
5202 c
= malloc(sizeof(*c
));
5204 fprintf(stderr
, "Failed to allocate memory for %s\n", name
);
5207 memset(c
, 0, sizeof(*c
));
5210 c
->config_path
= strdup(configpath
);
5212 c
->config_path
= strdup(lxc_global_config_value("lxc.lxcpath"));
5213 if (!c
->config_path
) {
5214 fprintf(stderr
, "Failed to allocate memory for %s\n", name
);
5218 remove_trailing_slashes(c
->config_path
);
5221 c
->name
= malloc(len
+ 1);
5223 fprintf(stderr
, "Failed to allocate memory for %s\n", name
);
5226 (void)strlcpy(c
->name
, name
, len
+ 1);
5229 c
->slock
= lxc_newlock(c
->config_path
, name
);
5231 fprintf(stderr
, "Failed to create lock for %s\n", name
);
5235 c
->privlock
= lxc_newlock(NULL
, NULL
);
5237 fprintf(stderr
, "Failed to create private lock for %s\n", name
);
5241 if (!set_config_filename(c
)) {
5242 fprintf(stderr
, "Failed to create config file name for %s\n", name
);
5246 if (file_exists(c
->configfile
) && !lxcapi_load_config(c
, NULL
)) {
5247 fprintf(stderr
, "Failed to load config for %s\n", name
);
5251 if (ongoing_create(c
) == 2) {
5252 ERROR("Failed to complete container creation for %s", c
->name
);
5253 container_destroy(c
, NULL
);
5254 lxcapi_clear_config(c
);
5257 c
->daemonize
= true;
5260 /* Assign the member functions. */
5261 c
->is_defined
= lxcapi_is_defined
;
5262 c
->state
= lxcapi_state
;
5263 c
->is_running
= lxcapi_is_running
;
5264 c
->freeze
= lxcapi_freeze
;
5265 c
->unfreeze
= lxcapi_unfreeze
;
5266 c
->console
= lxcapi_console
;
5267 c
->console_getfd
= lxcapi_console_getfd
;
5268 c
->init_pid
= lxcapi_init_pid
;
5269 c
->load_config
= lxcapi_load_config
;
5270 c
->want_daemonize
= lxcapi_want_daemonize
;
5271 c
->want_close_all_fds
= lxcapi_want_close_all_fds
;
5272 c
->start
= lxcapi_start
;
5273 c
->startl
= lxcapi_startl
;
5274 c
->stop
= lxcapi_stop
;
5275 c
->config_file_name
= lxcapi_config_file_name
;
5276 c
->wait
= lxcapi_wait
;
5277 c
->set_config_item
= lxcapi_set_config_item
;
5278 c
->destroy
= lxcapi_destroy
;
5279 c
->destroy_with_snapshots
= lxcapi_destroy_with_snapshots
;
5280 c
->rename
= lxcapi_rename
;
5281 c
->save_config
= lxcapi_save_config
;
5282 c
->get_keys
= lxcapi_get_keys
;
5283 c
->create
= lxcapi_create
;
5284 c
->createl
= lxcapi_createl
;
5285 c
->shutdown
= lxcapi_shutdown
;
5286 c
->reboot
= lxcapi_reboot
;
5287 c
->reboot2
= lxcapi_reboot2
;
5288 c
->clear_config
= lxcapi_clear_config
;
5289 c
->clear_config_item
= lxcapi_clear_config_item
;
5290 c
->get_config_item
= lxcapi_get_config_item
;
5291 c
->get_running_config_item
= lxcapi_get_running_config_item
;
5292 c
->get_cgroup_item
= lxcapi_get_cgroup_item
;
5293 c
->set_cgroup_item
= lxcapi_set_cgroup_item
;
5294 c
->get_config_path
= lxcapi_get_config_path
;
5295 c
->set_config_path
= lxcapi_set_config_path
;
5296 c
->clone
= lxcapi_clone
;
5297 c
->get_interfaces
= lxcapi_get_interfaces
;
5298 c
->get_ips
= lxcapi_get_ips
;
5299 c
->attach
= lxcapi_attach
;
5300 c
->attach_run_wait
= lxcapi_attach_run_wait
;
5301 c
->attach_run_waitl
= lxcapi_attach_run_waitl
;
5302 c
->snapshot
= lxcapi_snapshot
;
5303 c
->snapshot_list
= lxcapi_snapshot_list
;
5304 c
->snapshot_restore
= lxcapi_snapshot_restore
;
5305 c
->snapshot_destroy
= lxcapi_snapshot_destroy
;
5306 c
->snapshot_destroy_all
= lxcapi_snapshot_destroy_all
;
5307 c
->may_control
= lxcapi_may_control
;
5308 c
->add_device_node
= lxcapi_add_device_node
;
5309 c
->remove_device_node
= lxcapi_remove_device_node
;
5310 c
->attach_interface
= lxcapi_attach_interface
;
5311 c
->detach_interface
= lxcapi_detach_interface
;
5312 c
->checkpoint
= lxcapi_checkpoint
;
5313 c
->restore
= lxcapi_restore
;
5314 c
->migrate
= lxcapi_migrate
;
5315 c
->console_log
= lxcapi_console_log
;
5316 c
->mount
= lxcapi_mount
;
5317 c
->umount
= lxcapi_umount
;
5322 lxc_container_free(c
);
5326 int lxc_get_wait_states(const char **states
)
5331 for (i
=0; i
<MAX_STATE
; i
++)
5332 states
[i
] = lxc_state2str(i
);
5338 * These next two could probably be done smarter with reusing a common function
5339 * with different iterators and tests...
5341 int list_defined_containers(const char *lxcpath
, char ***names
, struct lxc_container
***cret
)
5344 int i
, cfound
= 0, nfound
= 0;
5345 struct dirent
*direntp
;
5346 struct lxc_container
*c
;
5349 lxcpath
= lxc_global_config_value("lxc.lxcpath");
5351 dir
= opendir(lxcpath
);
5353 SYSERROR("opendir on lxcpath");
5363 while ((direntp
= readdir(dir
))) {
5364 /* Ignore '.', '..' and any hidden directory. */
5365 if (!strncmp(direntp
->d_name
, ".", 1))
5368 if (!config_file_exists(lxcpath
, direntp
->d_name
))
5372 if (!add_to_array(names
, direntp
->d_name
, cfound
))
5382 c
= lxc_container_new(direntp
->d_name
, lxcpath
);
5384 INFO("Container %s:%s has a config but could not be loaded",
5385 lxcpath
, direntp
->d_name
);
5388 if(!remove_from_array(names
, direntp
->d_name
, cfound
--))
5394 if (!do_lxcapi_is_defined(c
)) {
5395 INFO("Container %s:%s has a config but is not defined",
5396 lxcpath
, direntp
->d_name
);
5399 if(!remove_from_array(names
, direntp
->d_name
, cfound
--))
5402 lxc_container_put(c
);
5406 if (!add_to_clist(cret
, c
, nfound
, true)) {
5407 lxc_container_put(c
);
5418 if (names
&& *names
) {
5419 for (i
=0; i
<cfound
; i
++)
5424 if (cret
&& *cret
) {
5425 for (i
=0; i
<nfound
; i
++)
5426 lxc_container_put((*cret
)[i
]);
5434 int list_active_containers(const char *lxcpath
, char ***nret
,
5435 struct lxc_container
***cret
)
5437 int i
, ret
= -1, cret_cnt
= 0, ct_name_cnt
= 0;
5440 char **ct_name
= NULL
;
5442 struct lxc_container
*c
= NULL
;
5446 lxcpath
= lxc_global_config_value("lxc.lxcpath");
5447 lxcpath_len
= strlen(lxcpath
);
5455 FILE *f
= fopen("/proc/net/unix", "r");
5459 while (getline(&line
, &len
, f
) != -1) {
5460 char *p
= strrchr(line
, ' '), *p2
;
5471 if (strncmp(p
, lxcpath
, lxcpath_len
) == 0) {
5473 } else if (strncmp(p
, "lxc/", 4) == 0) {
5483 /* Now p is the start of lxc_name. */
5484 p2
= strchr(p
, '/');
5485 if (!p2
|| strncmp(p2
, "/command", 8) != 0)
5490 char *recvpath
= lxc_cmd_get_lxcpath(p
);
5494 if (strncmp(lxcpath
, recvpath
, lxcpath_len
) != 0) {
5500 p
= lxc_cmd_get_name(p
);
5505 if (array_contains(&ct_name
, p
, ct_name_cnt
)) {
5511 if (!add_to_array(&ct_name
, p
, ct_name_cnt
)) {
5514 goto free_cret_list
;
5525 c
= lxc_container_new(p
, lxcpath
);
5527 INFO("Container %s:%s is running but could not be loaded",
5530 remove_from_array(&ct_name
, p
, ct_name_cnt
--);
5541 * If this is an anonymous container, then is_defined *can*
5542 * return false. So we don't do that check. Count on the
5543 * fact that the command socket exists.
5546 if (!add_to_clist(cret
, c
, cret_cnt
, true)) {
5547 lxc_container_put(c
);
5548 goto free_cret_list
;
5554 if (nret
&& cret
&& cret_cnt
!= ct_name_cnt
) {
5556 lxc_container_put(c
);
5557 goto free_cret_list
;
5569 if (cret
&& *cret
) {
5570 for (i
= 0; i
< cret_cnt
; i
++)
5571 lxc_container_put((*cret
)[i
]);
5577 for (i
= 0; i
< ct_name_cnt
; i
++)
5588 int list_all_containers(const char *lxcpath
, char ***nret
,
5589 struct lxc_container
***cret
)
5591 int i
, ret
, active_cnt
, ct_cnt
, ct_list_cnt
;
5594 struct lxc_container
**ct_list
= NULL
;
5596 ct_cnt
= list_defined_containers(lxcpath
, &ct_name
, NULL
);
5600 active_cnt
= list_active_containers(lxcpath
, &active_name
, NULL
);
5601 if (active_cnt
< 0) {
5606 for (i
= 0; i
< active_cnt
; i
++) {
5607 if (!array_contains(&ct_name
, active_name
[i
], ct_cnt
)) {
5608 if (!add_to_array(&ct_name
, active_name
[i
], ct_cnt
)) {
5610 goto free_active_name
;
5616 free(active_name
[i
]);
5617 active_name
[i
] = NULL
;
5624 for (i
= 0, ct_list_cnt
= 0; i
< ct_cnt
&& cret
; i
++) {
5625 struct lxc_container
*c
;
5627 c
= lxc_container_new(ct_name
[i
], lxcpath
);
5629 WARN("Container %s:%s could not be loaded", lxcpath
, ct_name
[i
]);
5630 remove_from_array(&ct_name
, ct_name
[i
], ct_cnt
--);
5634 if (!add_to_clist(&ct_list
, c
, ct_list_cnt
, false)) {
5635 lxc_container_put(c
);
5656 for (i
= 0; i
< ct_list_cnt
; i
++) {
5657 lxc_container_put(ct_list
[i
]);
5662 for (i
= 0; i
< active_cnt
; i
++) {
5663 free(active_name
[i
]);
5668 for (i
= 0; i
< ct_cnt
; i
++) {
5675 bool lxc_config_item_is_supported(const char *key
)
5677 return !!lxc_get_config(key
);
5680 bool lxc_has_api_extension(const char *extension
)
5682 /* The NULL API extension is always present. :) */
5686 for (size_t i
= 0; i
< nr_api_extensions
; i
++)
5687 if (strcmp(api_extensions
[i
], extension
) == 0)