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"
64 #include "memory_utils.h"
66 #include "namespace.h"
69 #include "raw_syscalls.h"
73 #include "storage/btrfs.h"
74 #include "storage/overlay.h"
75 #include "storage_utils.h"
77 #include "syscall_wrappers.h"
84 #include <sys/mkdev.h>
88 #include <../include/lxcmntent.h>
94 #include "include/strlcpy.h"
97 /* Define faccessat() if missing from the C library */
98 #ifndef HAVE_FACCESSAT
99 static int faccessat(int __fd
, const char *__file
, int __type
, int __flag
)
101 #ifdef __NR_faccessat
102 return syscall(__NR_faccessat
, __fd
, __file
, __type
, __flag
);
110 lxc_log_define(lxccontainer
, lxc
);
112 static bool do_lxcapi_destroy(struct lxc_container
*c
);
113 static const char *lxcapi_get_config_path(struct lxc_container
*c
);
114 #define do_lxcapi_get_config_path(c) lxcapi_get_config_path(c)
115 static bool do_lxcapi_set_config_item(struct lxc_container
*c
, const char *key
, const char *v
);
116 static bool container_destroy(struct lxc_container
*c
,
117 struct lxc_storage
*storage
);
118 static bool get_snappath_dir(struct lxc_container
*c
, char *snappath
);
119 static bool lxcapi_snapshot_destroy_all(struct lxc_container
*c
);
120 static bool do_lxcapi_save_config(struct lxc_container
*c
, const char *alt_file
);
122 static bool config_file_exists(const char *lxcpath
, const char *cname
)
124 __do_free
char *fname
;
128 /* $lxcpath + '/' + $cname + '/config' + \0 */
129 len
= strlen(lxcpath
) + strlen(cname
) + 9;
130 fname
= must_realloc(NULL
, len
);
131 ret
= snprintf(fname
, len
, "%s/%s/config", lxcpath
, cname
);
132 if (ret
< 0 || (size_t)ret
>= len
)
135 return file_exists(fname
);
138 /* A few functions to help detect when a container creation failed. If a
139 * container creation was killed partway through, then trying to actually start
140 * that container could harm the host. We detect this by creating a 'partial'
141 * file under the container directory, and keeping an advisory lock. When
142 * container creation completes, we remove that file. When we load or try to
143 * start a container, if we find that file, without a flock, we remove the
146 static int ongoing_create(struct lxc_container
*c
)
148 __do_free
char *path
;
151 struct flock lk
= {0};
153 len
= strlen(c
->config_path
) + strlen(c
->name
) + 10;
154 path
= must_realloc(NULL
, len
);
155 ret
= snprintf(path
, len
, "%s/%s/partial", c
->config_path
, c
->name
);
156 if (ret
< 0 || (size_t)ret
>= len
)
159 fd
= open(path
, O_RDWR
| O_CLOEXEC
);
168 lk
.l_whence
= SEEK_SET
;
169 /* F_OFD_GETLK requires that l_pid be set to 0 otherwise the kernel
174 ret
= fcntl(fd
, F_OFD_GETLK
, &lk
);
175 if (ret
< 0 && errno
== EINVAL
) {
176 ret
= flock(fd
, LOCK_EX
| LOCK_NB
);
177 if (ret
< 0 && errno
== EWOULDBLOCK
)
183 /* F_OFD_GETLK will not send us back a pid so don't check it. */
185 /* Create is still ongoing. */
188 /* Create completed but partial is still there. */
192 static int create_partial(struct lxc_container
*c
)
194 __do_free
char *path
;
197 struct flock lk
= {0};
199 /* $lxcpath + '/' + $name + '/partial' + \0 */
200 len
= strlen(c
->config_path
) + strlen(c
->name
) + 10;
201 path
= must_realloc(NULL
, len
);
202 ret
= snprintf(path
, len
, "%s/%s/partial", c
->config_path
, c
->name
);
203 if (ret
< 0 || (size_t)ret
>= len
)
206 fd
= open(path
, O_RDWR
| O_CREAT
| O_EXCL
| O_CLOEXEC
, 0000);
211 lk
.l_whence
= SEEK_SET
;
213 ret
= fcntl(fd
, F_OFD_SETLKW
, &lk
);
215 if (errno
== EINVAL
) {
216 ret
= flock(fd
, LOCK_EX
);
221 SYSERROR("Failed to lock partial file %s", path
);
229 static void remove_partial(struct lxc_container
*c
, int fd
)
231 __do_free
char *path
;
237 /* $lxcpath + '/' + $name + '/partial' + \0 */
238 len
= strlen(c
->config_path
) + strlen(c
->name
) + 10;
239 path
= must_realloc(NULL
, len
);
240 ret
= snprintf(path
, len
, "%s/%s/partial", c
->config_path
, c
->name
);
241 if (ret
< 0 || (size_t)ret
>= len
)
246 SYSERROR("Failed to remove partial file %s", path
);
250 * 1. container_mem_lock(c) protects the struct lxc_container from multiple threads.
251 * 2. container_disk_lock(c) protects the on-disk container data - in particular the
252 * container configuration file.
253 * The container_disk_lock also takes the container_mem_lock.
254 * 3. thread_mutex protects process data (ex: fd table) from multiple threads.
255 * NOTHING mutexes two independent programs with their own struct
256 * lxc_container for the same c->name, between API calls. For instance,
257 * c->config_read(); c->start(); Between those calls, data on disk
258 * could change (which shouldn't bother the caller unless for instance
259 * the rootfs get moved). c->config_read(); update; c->config_write();
260 * Two such updaters could race. The callers should therefore check their
261 * results. Trying to prevent that would necessarily expose us to deadlocks
262 * due to hung callers. So I prefer to keep the locks only within our own
263 * functions, not across functions.
265 * If you're going to clone while holding a lxccontainer, increment
266 * c->numthreads (under privlock) before forking. When deleting,
267 * decrement numthreads under privlock, then if it hits 0 you can delete.
268 * Do not ever use a lxccontainer whose numthreads you did not bump.
270 static void lxc_container_free(struct lxc_container
*c
)
276 c
->configfile
= NULL
;
278 free(c
->error_string
);
279 c
->error_string
= NULL
;
282 lxc_putlock(c
->slock
);
287 lxc_putlock(c
->privlock
);
295 lxc_conf_free(c
->lxc_conf
);
299 free(c
->config_path
);
300 c
->config_path
= NULL
;
305 /* Consider the following case:
307 * |====================================================================|
308 * | freer | racing get()er |
309 * |====================================================================|
310 * | lxc_container_put() | lxc_container_get() |
311 * | \ lxclock(c->privlock) | c->numthreads < 1? (no) |
312 * | \ c->numthreads = 0 | \ lxclock(c->privlock) -> waits |
313 * | \ lxcunlock() | \ |
314 * | \ lxc_container_free() | \ lxclock() returns |
315 * | | \ c->numthreads < 1 -> return 0 |
316 * | \ \ (free stuff) | |
317 * | \ \ sem_destroy(privlock) | |
318 * |_______________________________|____________________________________|
320 * When the get()er checks numthreads the first time, one of the following
322 * 1. freer has set numthreads = 0. get() returns 0
323 * 2. freer is between lxclock and setting numthreads to 0. get()er will
324 * sem_wait on privlock, get lxclock after freer() drops it, then see
325 * numthreads is 0 and exit without touching lxclock again..
326 * 3. freer has not yet locked privlock. If get()er runs first, then put()er
327 * will see --numthreads = 1 and not call lxc_container_free().
330 int lxc_container_get(struct lxc_container
*c
)
335 /* If someone else has already started freeing the container, don't try
336 * to take the lock, which may be invalid.
338 if (c
->numthreads
< 1)
341 if (container_mem_lock(c
))
344 /* Bail without trying to unlock, bc the privlock is now probably in
347 if (c
->numthreads
< 1)
351 container_mem_unlock(c
);
356 int lxc_container_put(struct lxc_container
*c
)
361 if (container_mem_lock(c
))
366 if (c
->numthreads
< 1) {
367 container_mem_unlock(c
);
368 lxc_container_free(c
);
372 container_mem_unlock(c
);
376 static bool do_lxcapi_is_defined(struct lxc_container
*c
)
385 if (container_mem_lock(c
))
391 statret
= stat(c
->configfile
, &statbuf
);
398 container_mem_unlock(c
);
402 #define WRAP_API(rettype, fnname) \
403 static rettype fnname(struct lxc_container *c) \
406 bool reset_config = false; \
408 if (!current_config && c && c->lxc_conf) { \
409 current_config = c->lxc_conf; \
410 reset_config = true; \
413 ret = do_##fnname(c); \
415 current_config = NULL; \
420 #define WRAP_API_1(rettype, fnname, t1) \
421 static rettype fnname(struct lxc_container *c, t1 a1) \
424 bool reset_config = false; \
426 if (!current_config && c && c->lxc_conf) { \
427 current_config = c->lxc_conf; \
428 reset_config = true; \
431 ret = do_##fnname(c, a1); \
433 current_config = NULL; \
438 #define WRAP_API_2(rettype, fnname, t1, t2) \
439 static rettype fnname(struct lxc_container *c, t1 a1, t2 a2) \
442 bool reset_config = false; \
444 if (!current_config && c && c->lxc_conf) { \
445 current_config = c->lxc_conf; \
446 reset_config = true; \
449 ret = do_##fnname(c, a1, a2); \
451 current_config = NULL; \
456 #define WRAP_API_3(rettype, fnname, t1, t2, t3) \
457 static rettype fnname(struct lxc_container *c, t1 a1, t2 a2, t3 a3) \
460 bool reset_config = false; \
462 if (!current_config && c && c->lxc_conf) { \
463 current_config = c->lxc_conf; \
464 reset_config = true; \
467 ret = do_##fnname(c, a1, a2, a3); \
469 current_config = NULL; \
474 #define WRAP_API_6(rettype, fnname, t1, t2, t3, t4, t5, t6) \
475 static rettype fnname(struct lxc_container *c, t1 a1, t2 a2, t3 a3, \
476 t4 a4, t5 a5, t6 a6) \
479 bool reset_config = false; \
481 if (!current_config && c && c->lxc_conf) { \
482 current_config = c->lxc_conf; \
483 reset_config = true; \
486 ret = do_##fnname(c, a1, a2, a3, a4, a5, a6); \
488 current_config = NULL; \
493 WRAP_API(bool, lxcapi_is_defined
)
495 static const char *do_lxcapi_state(struct lxc_container
*c
)
502 s
= lxc_getstate(c
->name
, c
->config_path
);
503 return lxc_state2str(s
);
506 WRAP_API(const char *, lxcapi_state
)
508 static bool is_stopped(struct lxc_container
*c
)
512 s
= lxc_getstate(c
->name
, c
->config_path
);
513 return (s
== STOPPED
);
516 static bool do_lxcapi_is_running(struct lxc_container
*c
)
521 return !is_stopped(c
);
524 WRAP_API(bool, lxcapi_is_running
)
526 static bool do_lxcapi_freeze(struct lxc_container
*c
)
531 if (!c
|| !c
->lxc_conf
)
534 s
= lxc_getstate(c
->name
, c
->config_path
);
536 return lxc_freeze(c
->lxc_conf
, c
->name
, c
->config_path
) == 0;
541 WRAP_API(bool, lxcapi_freeze
)
543 static bool do_lxcapi_unfreeze(struct lxc_container
*c
)
548 if (!c
|| !c
->lxc_conf
)
551 s
= lxc_getstate(c
->name
, c
->config_path
);
553 return lxc_unfreeze(c
->lxc_conf
, c
->name
, c
->config_path
) == 0;
558 WRAP_API(bool, lxcapi_unfreeze
)
560 static int do_lxcapi_console_getfd(struct lxc_container
*c
, int *ttynum
, int *masterfd
)
565 return lxc_terminal_getfd(c
, ttynum
, masterfd
);
568 WRAP_API_2(int, lxcapi_console_getfd
, int *, int *)
570 static int lxcapi_console(struct lxc_container
*c
, int ttynum
, int stdinfd
,
571 int stdoutfd
, int stderrfd
, int escape
)
578 current_config
= c
->lxc_conf
;
579 ret
= lxc_console(c
, ttynum
, stdinfd
, stdoutfd
, stderrfd
, escape
);
580 current_config
= NULL
;
585 static int do_lxcapi_console_log(struct lxc_container
*c
, struct lxc_console_log
*log
)
592 ret
= lxc_cmd_console_log(c
->name
, do_lxcapi_get_config_path(c
), log
);
595 NOTICE("The console log is empty");
596 else if (ret
== -EFAULT
)
597 NOTICE("The container does not keep a console log");
598 else if (ret
== -ENOENT
)
599 NOTICE("The container does not keep a console log file");
600 else if (ret
== -EIO
)
601 NOTICE("Failed to write console log to log file");
603 ERROR("Failed to retrieve console log");
609 WRAP_API_1(int, lxcapi_console_log
, struct lxc_console_log
*)
611 static pid_t
do_lxcapi_init_pid(struct lxc_container
*c
)
616 return lxc_cmd_get_init_pid(c
->name
, c
->config_path
);
619 WRAP_API(pid_t
, lxcapi_init_pid
)
621 static bool load_config_locked(struct lxc_container
*c
, const char *fname
)
624 c
->lxc_conf
= lxc_conf_init();
629 if (lxc_config_read(fname
, c
->lxc_conf
, false) != 0)
632 c
->lxc_conf
->name
= c
->name
;
636 static bool do_lxcapi_load_config(struct lxc_container
*c
, const char *alt_file
)
640 bool need_disklock
= false, ret
= false;
645 fname
= c
->configfile
;
653 /* If we're reading something other than the container's config, we only
654 * need to lock the in-memory container. If loading the container's
655 * config file, take the disk lock.
657 if (strcmp(fname
, c
->configfile
) == 0)
658 need_disklock
= true;
661 lret
= container_disk_lock(c
);
663 lret
= container_mem_lock(c
);
667 ret
= load_config_locked(c
, fname
);
670 container_disk_unlock(c
);
672 container_mem_unlock(c
);
677 WRAP_API_1(bool, lxcapi_load_config
, const char *)
679 static bool do_lxcapi_want_daemonize(struct lxc_container
*c
, bool state
)
681 if (!c
|| !c
->lxc_conf
)
684 if (container_mem_lock(c
))
687 c
->daemonize
= state
;
689 container_mem_unlock(c
);
694 WRAP_API_1(bool, lxcapi_want_daemonize
, bool)
696 static bool do_lxcapi_want_close_all_fds(struct lxc_container
*c
, bool state
)
698 if (!c
|| !c
->lxc_conf
)
701 if (container_mem_lock(c
))
704 c
->lxc_conf
->close_all_fds
= state
;
706 container_mem_unlock(c
);
711 WRAP_API_1(bool, lxcapi_want_close_all_fds
, bool)
713 static bool do_lxcapi_wait(struct lxc_container
*c
, const char *state
,
721 ret
= lxc_wait(c
->name
, state
, timeout
, c
->config_path
);
725 WRAP_API_2(bool, lxcapi_wait
, const char *, int)
727 static bool am_single_threaded(void)
730 struct dirent
*direntp
;
733 dir
= opendir("/proc/self/task");
737 while ((direntp
= readdir(dir
))) {
738 if (strcmp(direntp
->d_name
, ".") == 0)
741 if (strcmp(direntp
->d_name
, "..") == 0)
753 static void push_arg(char ***argp
, char *arg
, int *nargs
)
758 copy
= must_copy_string(arg
);
761 argv
= realloc(*argp
, (*nargs
+ 2) * sizeof(char *));
770 static char **split_init_cmd(const char *incmd
)
772 __do_free
char *copy
= NULL
;
780 copy
= must_copy_string(incmd
);
783 argv
= malloc(sizeof(char *));
787 lxc_iterate_parts (p
, copy
, " ")
788 push_arg(&argv
, p
, &nargs
);
798 static void free_init_cmd(char **argv
)
811 static int lxc_rcv_status(int state_socket
)
817 /* Receive container state. */
818 ret
= lxc_abstract_unix_rcv_credential(state_socket
, &state
, sizeof(int));
823 TRACE("Caught EINTR; retrying");
830 static bool wait_on_daemonized_start(struct lxc_handler
*handler
, int pid
)
834 /* Close write end of the socket pair. */
835 close(handler
->state_socket_pair
[1]);
836 handler
->state_socket_pair
[1] = -1;
838 state
= lxc_rcv_status(handler
->state_socket_pair
[0]);
840 /* Close read end of the socket pair. */
841 close(handler
->state_socket_pair
[0]);
842 handler
->state_socket_pair
[0] = -1;
844 /* The first child is going to fork() again and then exits. So we reap
845 * the first child here.
847 ret
= wait_for_pid(pid
);
849 DEBUG("Failed waiting on first child %d", pid
);
851 DEBUG("First child %d exited", pid
);
854 SYSERROR("Failed to receive the container state");
858 /* If we receive anything else then running we know that the container
861 if (state
!= RUNNING
) {
862 ERROR("Received container state \"%s\" instead of \"RUNNING\"",
863 lxc_state2str(state
));
867 TRACE("Container is in \"RUNNING\" state");
871 static bool do_lxcapi_start(struct lxc_container
*c
, int useinit
, char * const argv
[])
874 struct lxc_handler
*handler
;
875 struct lxc_conf
*conf
;
876 char *default_args
[] = {
880 char **init_cmd
= NULL
;
881 int keepfds
[3] = {-1, -1, -1};
883 /* container does exist */
887 /* If anything fails before we set error_num, we want an error in there.
891 /* Container has not been setup. */
895 ret
= ongoing_create(c
);
897 ERROR("Failed checking for incomplete container creation");
899 } else if (ret
== 1) {
900 ERROR("Ongoing container creation detected");
902 } else if (ret
== 2) {
903 ERROR("Failed to create container");
904 do_lxcapi_destroy(c
);
908 if (container_mem_lock(c
))
913 /* initialize handler */
914 handler
= lxc_init_handler(c
->name
, conf
, c
->config_path
, c
->daemonize
);
916 container_mem_unlock(c
);
921 if (useinit
&& conf
->execute_cmd
)
922 argv
= init_cmd
= split_init_cmd(conf
->execute_cmd
);
924 argv
= init_cmd
= split_init_cmd(conf
->init_cmd
);
927 /* ... otherwise use default_args. */
930 ERROR("No valid init detected");
931 lxc_free_handler(handler
);
937 /* I'm not sure what locks we want here.Any? Is liblxc's locking enough
938 * here to protect the on disk container? We don't want to exclude
939 * things like lxc_info while the container is running.
948 free_init_cmd(init_cmd
);
949 lxc_free_handler(handler
);
955 /* Set to NULL because we don't want father unlink
956 * the PID file, child will do the free and unlink.
960 /* Wait for container to tell us whether it started
963 started
= wait_on_daemonized_start(handler
, pid
);
965 free_init_cmd(init_cmd
);
966 lxc_free_handler(handler
);
972 /* We don't really care if this doesn't print all the
973 * characters. All that it means is that the proctitle will be
974 * ugly. Similarly, we also don't care if setproctitle() fails.
976 ret
= snprintf(title
, sizeof(title
), "[lxc monitor] %s %s", c
->config_path
, c
->name
);
978 ret
= setproctitle(title
);
980 INFO("Failed to set process title to %s", title
);
982 INFO("Set process title to %s", title
);
985 /* We fork() a second time to be reparented to init. Like
986 * POSIX's daemon() function we change to "/" and redirect
987 * std{in,out,err} to /dev/null.
991 SYSERROR("Failed to fork first child process");
997 free_init_cmd(init_cmd
);
998 lxc_free_handler(handler
);
1004 /* change to / directory */
1007 SYSERROR("Failed to change to \"/\" directory");
1008 _exit(EXIT_FAILURE
);
1011 keepfds
[0] = handler
->conf
->maincmd_fd
;
1012 keepfds
[1] = handler
->state_socket_pair
[0];
1013 keepfds
[2] = handler
->state_socket_pair
[1];
1014 ret
= lxc_check_inherited(conf
, true, keepfds
,
1015 sizeof(keepfds
) / sizeof(keepfds
[0]));
1017 _exit(EXIT_FAILURE
);
1019 /* redirect std{in,out,err} to /dev/null */
1020 ret
= null_stdfds();
1022 ERROR("Failed to redirect std{in,out,err} to /dev/null");
1023 _exit(EXIT_FAILURE
);
1026 /* become session leader */
1029 TRACE("Process %d is already process group leader", lxc_raw_getpid());
1030 } else if (!am_single_threaded()) {
1031 ERROR("Cannot start non-daemonized container when threaded");
1032 free_init_cmd(init_cmd
);
1033 lxc_free_handler(handler
);
1037 /* We need to write PID file after daemonize, so we always write the
1042 char pidstr
[INTTYPE_TO_STRLEN(pid_t
)];
1044 w
= snprintf(pidstr
, sizeof(pidstr
), "%d", lxc_raw_getpid());
1045 if (w
< 0 || (size_t)w
>= sizeof(pidstr
)) {
1046 free_init_cmd(init_cmd
);
1047 lxc_free_handler(handler
);
1049 SYSERROR("Failed to write monitor pid to \"%s\"", c
->pidfile
);
1052 _exit(EXIT_FAILURE
);
1057 ret
= lxc_write_to_file(c
->pidfile
, pidstr
, w
, false, 0600);
1059 free_init_cmd(init_cmd
);
1060 lxc_free_handler(handler
);
1062 SYSERROR("Failed to write monitor pid to \"%s\"", c
->pidfile
);
1065 _exit(EXIT_FAILURE
);
1071 conf
->reboot
= REBOOT_NONE
;
1073 /* Unshare the mount namespace if requested */
1074 if (conf
->monitor_unshare
) {
1075 ret
= unshare(CLONE_NEWNS
);
1077 SYSERROR("Failed to unshare mount namespace");
1078 lxc_free_handler(handler
);
1083 ret
= mount(NULL
, "/", NULL
, MS_SLAVE
|MS_REC
, NULL
);
1085 SYSERROR("Failed to make / rslave at startup");
1086 lxc_free_handler(handler
);
1093 if (conf
->reboot
== REBOOT_INIT
) {
1094 /* initialize handler */
1095 handler
= lxc_init_handler(c
->name
, conf
, c
->config_path
, c
->daemonize
);
1102 keepfds
[0] = handler
->conf
->maincmd_fd
;
1103 keepfds
[1] = handler
->state_socket_pair
[0];
1104 keepfds
[2] = handler
->state_socket_pair
[1];
1105 ret
= lxc_check_inherited(conf
, c
->daemonize
, keepfds
,
1106 sizeof(keepfds
) / sizeof(keepfds
[0]));
1108 lxc_free_handler(handler
);
1114 ret
= lxc_execute(c
->name
, argv
, 1, handler
, c
->config_path
,
1115 c
->daemonize
, &c
->error_num
);
1117 ret
= lxc_start(c
->name
, argv
, handler
, c
->config_path
,
1118 c
->daemonize
, &c
->error_num
);
1120 if (conf
->reboot
== REBOOT_REQ
) {
1121 INFO("Container requested reboot");
1122 conf
->reboot
= REBOOT_INIT
;
1132 free_init_cmd(init_cmd
);
1134 if (c
->daemonize
&& ret
!= 0)
1135 _exit(EXIT_FAILURE
);
1136 else if (c
->daemonize
)
1137 _exit(EXIT_SUCCESS
);
1145 static bool lxcapi_start(struct lxc_container
*c
, int useinit
,
1150 current_config
= c
? c
->lxc_conf
: NULL
;
1151 ret
= do_lxcapi_start(c
, useinit
, argv
);
1152 current_config
= NULL
;
1157 /* Note, there MUST be an ending NULL. */
1158 static bool lxcapi_startl(struct lxc_container
*c
, int useinit
, ...)
1161 char **inargs
= NULL
;
1164 /* container exists */
1168 current_config
= c
->lxc_conf
;
1170 va_start(ap
, useinit
);
1171 inargs
= lxc_va_arg_list_to_argv(ap
, 0, 1);
1176 /* pass NULL if no arguments were supplied */
1177 bret
= do_lxcapi_start(c
, useinit
, *inargs
? inargs
: NULL
);
1183 for (arg
= inargs
; *arg
; arg
++)
1188 current_config
= NULL
;
1193 static bool do_lxcapi_stop(struct lxc_container
*c
)
1200 ret
= lxc_cmd_stop(c
->name
, c
->config_path
);
1205 WRAP_API(bool, lxcapi_stop
)
1207 static int do_create_container_dir(const char *path
, struct lxc_conf
*conf
)
1209 __do_free
char *p
= NULL
;
1214 mode_t mask
= umask(0002);
1215 ret
= mkdir(path
, 0770);
1220 if (errno
!= EEXIST
)
1226 p
= must_copy_string(path
);
1228 if (!lxc_list_empty(&conf
->id_map
)) {
1229 ret
= chown_mapped_root(p
, conf
);
1237 /* Create the standard expected container dir. */
1238 static bool create_container_dir(struct lxc_container
*c
)
1244 len
= strlen(c
->config_path
) + strlen(c
->name
) + 2;
1249 ret
= snprintf(s
, len
, "%s/%s", c
->config_path
, c
->name
);
1250 if (ret
< 0 || (size_t)ret
>= len
) {
1255 ret
= do_create_container_dir(s
, c
->lxc_conf
);
1261 /* do_storage_create: thin wrapper around storage_create(). Like
1262 * storage_create(), it returns a mounted bdev on success, NULL on error.
1264 static struct lxc_storage
*do_storage_create(struct lxc_container
*c
,
1266 struct bdev_specs
*specs
)
1268 __do_free
char *dest
;
1271 struct lxc_storage
*bdev
;
1273 /* rootfs.path or lxcpath/lxcname/rootfs */
1274 if (c
->lxc_conf
->rootfs
.path
&&
1275 (access(c
->lxc_conf
->rootfs
.path
, F_OK
) == 0)) {
1276 const char *rpath
= c
->lxc_conf
->rootfs
.path
;
1277 len
= strlen(rpath
) + 1;
1278 dest
= must_realloc(NULL
, len
);
1279 ret
= snprintf(dest
, len
, "%s", rpath
);
1281 const char *lxcpath
= do_lxcapi_get_config_path(c
);
1282 len
= strlen(c
->name
) + strlen(lxcpath
) + 9;
1283 dest
= must_realloc(NULL
, len
);
1284 ret
= snprintf(dest
, len
, "%s/%s/rootfs", lxcpath
, c
->name
);
1286 if (ret
< 0 || (size_t)ret
>= len
)
1289 bdev
= storage_create(dest
, type
, c
->name
, specs
);
1291 ERROR("Failed to create \"%s\" storage", type
);
1295 if (!c
->set_config_item(c
, "lxc.rootfs.path", bdev
->src
)) {
1296 ERROR("Failed to set \"lxc.rootfs.path = %s\"", bdev
->src
);
1300 /* If we are not root, chown the rootfs dir to root in the target user
1304 if (ret
!= 0 || (c
->lxc_conf
&& !lxc_list_empty(&c
->lxc_conf
->id_map
))) {
1305 ret
= chown_mapped_root(bdev
->dest
, c
->lxc_conf
);
1307 ERROR("Error chowning \"%s\" to container root", bdev
->dest
);
1308 suggest_default_idmap();
1317 static char *lxcbasename(char *path
)
1321 p
= path
+ strlen(path
) - 1;
1322 while (*p
!= '/' && p
> path
)
1328 static bool create_run_template(struct lxc_container
*c
, char *tpath
,
1329 bool need_null_stdfds
, char *const argv
[])
1339 SYSERROR("Failed to fork task for container creation template");
1343 if (pid
== 0) { /* child */
1345 char *namearg
, *patharg
, *rootfsarg
;
1348 struct lxc_storage
*bdev
= NULL
;
1349 struct lxc_conf
*conf
= c
->lxc_conf
;
1352 if (need_null_stdfds
) {
1353 ret
= null_stdfds();
1355 _exit(EXIT_FAILURE
);
1358 bdev
= storage_init(c
->lxc_conf
);
1360 ERROR("Failed to initialize storage");
1361 _exit(EXIT_FAILURE
);
1366 ret
= unshare(CLONE_NEWNS
);
1368 ERROR("Failed to unshare CLONE_NEWNS");
1369 _exit(EXIT_FAILURE
);
1372 ret
= detect_shared_rootfs();
1374 ret
= mount(NULL
, "/", NULL
, MS_SLAVE
| MS_REC
, NULL
);
1376 SYSERROR("Failed to make \"/\" rslave");
1377 ERROR("Continuing...");
1382 if (strcmp(bdev
->type
, "dir") != 0 && strcmp(bdev
->type
, "btrfs") != 0) {
1384 ERROR("Unprivileged users can only create "
1385 "btrfs and directory-backed containers");
1386 _exit(EXIT_FAILURE
);
1389 if (strcmp(bdev
->type
, "overlay") == 0 ||
1390 strcmp(bdev
->type
, "overlayfs") == 0) {
1391 /* If we create an overlay container we need to
1392 * rsync the contents into
1393 * <container-path>/<container-name>/rootfs.
1394 * However, the overlay mount function will
1396 * <container-path>/<container-name>/delta0
1398 * <container-path>/<container-name>/rootfs
1399 * which means we would rsync the rootfs into
1400 * the delta directory. That doesn't make sense
1401 * since the delta directory only exists to
1402 * record the differences to
1403 * <container-path>/<container-name>/rootfs. So
1404 * let's simply bind-mount here and then rsync
1406 * <container-path>/<container-name>/rootfs.
1410 src
= ovl_get_rootfs(bdev
->src
, &(size_t){0});
1412 ERROR("Failed to get rootfs");
1413 _exit(EXIT_FAILURE
);
1416 ret
= mount(src
, bdev
->dest
, "bind", MS_BIND
| MS_REC
, NULL
);
1418 ERROR("Failed to mount rootfs");
1419 _exit(EXIT_FAILURE
);
1422 ret
= bdev
->ops
->mount(bdev
);
1424 ERROR("Failed to mount rootfs");
1425 _exit(EXIT_FAILURE
);
1428 } else { /* TODO come up with a better way here! */
1431 src
= lxc_storage_get_path(bdev
->src
, bdev
->type
);
1432 bdev
->dest
= strdup(src
);
1435 /* Create our new array, pre-pend the template name and base
1439 for (nargs
= 0; argv
[nargs
]; nargs
++)
1442 /* template, path, rootfs and name args */
1445 newargv
= malloc(nargs
* sizeof(*newargv
));
1447 _exit(EXIT_FAILURE
);
1448 newargv
[0] = lxcbasename(tpath
);
1451 len
= strlen(c
->config_path
) + strlen(c
->name
) + strlen("--path=") + 2;
1452 patharg
= malloc(len
);
1454 _exit(EXIT_FAILURE
);
1456 ret
= snprintf(patharg
, len
, "--path=%s/%s", c
->config_path
, c
->name
);
1457 if (ret
< 0 || ret
>= len
)
1458 _exit(EXIT_FAILURE
);
1459 newargv
[1] = patharg
;
1462 len
= strlen("--name=") + strlen(c
->name
) + 1;
1463 namearg
= malloc(len
);
1465 _exit(EXIT_FAILURE
);
1467 ret
= snprintf(namearg
, len
, "--name=%s", c
->name
);
1468 if (ret
< 0 || ret
>= len
)
1469 _exit(EXIT_FAILURE
);
1470 newargv
[2] = namearg
;
1473 len
= strlen("--rootfs=") + 1 + strlen(bdev
->dest
);
1474 rootfsarg
= malloc(len
);
1476 _exit(EXIT_FAILURE
);
1478 ret
= snprintf(rootfsarg
, len
, "--rootfs=%s", bdev
->dest
);
1479 if (ret
< 0 || ret
>= len
)
1480 _exit(EXIT_FAILURE
);
1481 newargv
[3] = rootfsarg
;
1483 /* add passed-in args */
1485 for (i
= 4; i
< nargs
; i
++)
1486 newargv
[i
] = argv
[i
- 4];
1488 /* add trailing NULL */
1490 newargv
= realloc(newargv
, nargs
* sizeof(*newargv
));
1492 _exit(EXIT_FAILURE
);
1493 newargv
[nargs
- 1] = NULL
;
1495 /* If we're running the template in a mapped userns, then we
1496 * prepend the template command with: lxc-usernsexec <-m map1>
1497 * ... <-m mapn> -- and we append "--mapped-uid x", where x is
1498 * the mapped uid for our geteuid()
1500 if (!lxc_list_empty(&conf
->id_map
)) {
1501 int extraargs
, hostuid_mapped
, hostgid_mapped
;
1503 char txtuid
[20], txtgid
[20];
1504 struct lxc_list
*it
;
1508 n2
= malloc(n2args
* sizeof(*n2
));
1510 _exit(EXIT_FAILURE
);
1513 tpath
= "lxc-usernsexec";
1514 n2
[0] = "lxc-usernsexec";
1516 lxc_list_for_each(it
, &conf
->id_map
) {
1519 n2
= realloc(n2
, n2args
* sizeof(char *));
1521 _exit(EXIT_FAILURE
);
1523 n2
[n2args
- 2] = "-m";
1524 n2
[n2args
- 1] = malloc(200);
1525 if (!n2
[n2args
- 1])
1526 _exit(EXIT_FAILURE
);
1528 ret
= snprintf(n2
[n2args
- 1], 200, "%c:%lu:%lu:%lu",
1529 map
->idtype
== ID_TYPE_UID
? 'u' : 'g',
1530 map
->nsid
, map
->hostid
, map
->range
);
1531 if (ret
< 0 || ret
>= 200)
1532 _exit(EXIT_FAILURE
);
1535 hostuid_mapped
= mapped_hostid(geteuid(), conf
, ID_TYPE_UID
);
1536 extraargs
= hostuid_mapped
>= 0 ? 1 : 3;
1538 n2
= realloc(n2
, (nargs
+ n2args
+ extraargs
) * sizeof(char *));
1540 _exit(EXIT_FAILURE
);
1542 if (hostuid_mapped
< 0) {
1543 hostuid_mapped
= find_unmapped_nsid(conf
, ID_TYPE_UID
);
1544 n2
[n2args
++] = "-m";
1545 if (hostuid_mapped
< 0) {
1546 ERROR("Failed to find free uid to map");
1547 _exit(EXIT_FAILURE
);
1550 n2
[n2args
++] = malloc(200);
1551 if (!n2
[n2args
- 1]) {
1552 SYSERROR("out of memory");
1553 _exit(EXIT_FAILURE
);
1556 ret
= snprintf(n2
[n2args
- 1], 200, "u:%d:%d:1",
1557 hostuid_mapped
, geteuid());
1558 if (ret
< 0 || ret
>= 200)
1559 _exit(EXIT_FAILURE
);
1562 hostgid_mapped
= mapped_hostid(getegid(), conf
, ID_TYPE_GID
);
1563 extraargs
= hostgid_mapped
>= 0 ? 1 : 3;
1565 n2
= realloc(n2
, (nargs
+ n2args
+ extraargs
) * sizeof(char *));
1567 _exit(EXIT_FAILURE
);
1569 if (hostgid_mapped
< 0) {
1570 hostgid_mapped
= find_unmapped_nsid(conf
, ID_TYPE_GID
);
1571 n2
[n2args
++] = "-m";
1572 if (hostgid_mapped
< 0) {
1573 ERROR("Failed to find free gid to map");
1574 _exit(EXIT_FAILURE
);
1577 n2
[n2args
++] = malloc(200);
1578 if (!n2
[n2args
- 1]) {
1579 SYSERROR("out of memory");
1580 _exit(EXIT_FAILURE
);
1583 ret
= snprintf(n2
[n2args
- 1], 200, "g:%d:%d:1",
1584 hostgid_mapped
, getegid());
1585 if (ret
< 0 || ret
>= 200)
1586 _exit(EXIT_FAILURE
);
1589 n2
[n2args
++] = "--";
1591 for (i
= 0; i
< nargs
; i
++)
1592 n2
[i
+ n2args
] = newargv
[i
];
1595 /* Finally add "--mapped-uid $uid" to tell template what
1596 * to chown cached images to.
1599 n2
= realloc(n2
, n2args
* sizeof(char *));
1601 _exit(EXIT_FAILURE
);
1603 /* note n2[n2args-1] is NULL */
1604 n2
[n2args
- 5] = "--mapped-uid";
1606 ret
= snprintf(txtuid
, 20, "%d", hostuid_mapped
);
1607 if (ret
< 0 || ret
>= 20) {
1610 _exit(EXIT_FAILURE
);
1613 n2
[n2args
- 4] = txtuid
;
1614 n2
[n2args
- 3] = "--mapped-gid";
1616 ret
= snprintf(txtgid
, 20, "%d", hostgid_mapped
);
1617 if (ret
< 0 || ret
>= 20) {
1620 _exit(EXIT_FAILURE
);
1623 n2
[n2args
- 2] = txtgid
;
1624 n2
[n2args
- 1] = NULL
;
1629 execvp(tpath
, newargv
);
1630 SYSERROR("Failed to execute template %s", tpath
);
1631 _exit(EXIT_FAILURE
);
1634 ret
= wait_for_pid(pid
);
1636 ERROR("Failed to create container from template");
1643 static bool prepend_lxc_header(char *path
, const char *t
, char *const argv
[])
1652 unsigned char md_value
[SHA_DIGEST_LENGTH
];
1656 f
= fopen(path
, "r");
1660 ret
= fseek(f
, 0, SEEK_END
);
1669 ret
= fseek(f
, 0, SEEK_SET
);
1673 ret
= fseek(f
, 0, SEEK_SET
);
1678 contents
= malloc(flen
+ 1);
1682 len
= fread(contents
, 1, flen
, f
);
1684 goto out_free_contents
;
1686 contents
[flen
] = '\0';
1691 goto out_free_contents
;
1694 tpath
= get_template_path(t
);
1696 ERROR("Invalid template \"%s\" specified", t
);
1697 goto out_free_contents
;
1700 ret
= sha1sum_file(tpath
, md_value
);
1702 ERROR("Failed to get sha1sum of %s", tpath
);
1704 goto out_free_contents
;
1709 f
= fopen(path
, "w");
1711 SYSERROR("Reopening config for writing");
1716 fprintf(f
, "# Template used to create this container: %s\n", t
);
1718 fprintf(f
, "# Parameters passed to the template:");
1720 fprintf(f
, " %s", *argv
);
1727 fprintf(f
, "# Template script checksum (SHA-1): ");
1728 for (i
=0; i
<SHA_DIGEST_LENGTH
; i
++)
1729 fprintf(f
, "%02x", md_value
[i
]);
1732 fprintf(f
, "# For additional config options, please look at lxc.container.conf(5)\n");
1733 fprintf(f
, "\n# Uncomment the following line to support nesting containers:\n");
1734 fprintf(f
, "#lxc.include = " LXCTEMPLATECONFIG
"/nesting.conf\n");
1735 fprintf(f
, "# (Be aware this has security implications)\n\n");
1736 if (fwrite(contents
, 1, flen
, f
) != flen
) {
1737 SYSERROR("Writing original contents");
1757 SYSERROR("Error prepending header");
1764 static void lxcapi_clear_config(struct lxc_container
*c
)
1766 if (!c
|| !c
->lxc_conf
)
1769 lxc_conf_free(c
->lxc_conf
);
1773 #define do_lxcapi_clear_config(c) lxcapi_clear_config(c)
1777 * create a container with the given parameters.
1778 * @c: container to be created. It has the lxcpath, name, and a starting
1779 * configuration already set
1780 * @t: the template to execute to instantiate the root filesystem and
1781 * adjust the configuration.
1782 * @bdevtype: backing store type to use. If NULL, dir will be used.
1783 * @specs: additional parameters for the backing store, i.e. LVM vg to
1786 * @argv: the arguments to pass to the template, terminated by NULL. If no
1787 * arguments, you can just pass NULL.
1789 static bool do_lxcapi_create(struct lxc_container
*c
, const char *t
,
1790 const char *bdevtype
, struct bdev_specs
*specs
,
1791 int flags
, char *const argv
[])
1796 bool ret
= false, rootfs_managed
= true;
1803 tpath
= get_template_path(t
);
1805 ERROR("Unknown template \"%s\"", t
);
1810 /* If a template is passed in, and the rootfs already is defined in the
1811 * container config and exists, then the caller is trying to create an
1812 * existing container. Return an error, but do NOT delete the container.
1814 if (do_lxcapi_is_defined(c
) && c
->lxc_conf
&& c
->lxc_conf
->rootfs
.path
&&
1815 access(c
->lxc_conf
->rootfs
.path
, F_OK
) == 0 && tpath
) {
1816 ERROR("Container \"%s\" already exists in \"%s\"", c
->name
,
1822 if (!do_lxcapi_load_config(c
, lxc_global_config_value("lxc.default_config"))) {
1823 ERROR("Error loading default configuration file %s",
1824 lxc_global_config_value("lxc.default_config"));
1829 if (!create_container_dir(c
))
1832 if (c
->lxc_conf
->rootfs
.path
)
1833 rootfs_managed
= false;
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 remove_partial(c
, partial_fd
);
1942 bool reset_managed
= c
->lxc_conf
->rootfs
.managed
;
1945 * Ensure that we don't destroy storage we didn't create
1948 if (!rootfs_managed
)
1949 c
->lxc_conf
->rootfs
.managed
= false;
1950 container_destroy(c
, NULL
);
1951 c
->lxc_conf
->rootfs
.managed
= reset_managed
;
1959 static bool lxcapi_create(struct lxc_container
*c
, const char *t
,
1960 const char *bdevtype
, struct bdev_specs
*specs
,
1961 int flags
, char *const argv
[])
1965 current_config
= c
? c
->lxc_conf
: NULL
;
1967 ret
= do_lxcapi_create(c
, t
, bdevtype
, specs
, flags
, argv
);
1968 current_config
= NULL
;
1972 static bool do_lxcapi_reboot(struct lxc_container
*c
)
1976 int rebootsignal
= SIGINT
;
1981 if (!do_lxcapi_is_running(c
))
1984 pid
= do_lxcapi_init_pid(c
);
1988 if (c
->lxc_conf
&& c
->lxc_conf
->rebootsignal
)
1989 rebootsignal
= c
->lxc_conf
->rebootsignal
;
1991 ret
= kill(pid
, rebootsignal
);
1993 WARN("Failed to send signal %d to pid %d", rebootsignal
, pid
);
2000 WRAP_API(bool, lxcapi_reboot
)
2002 static bool do_lxcapi_reboot2(struct lxc_container
*c
, int timeout
)
2006 int rebootsignal
= SIGINT
, state_client_fd
= -1;
2007 lxc_state_t states
[MAX_STATE
] = {0};
2012 if (!do_lxcapi_is_running(c
))
2015 pid
= do_lxcapi_init_pid(c
);
2019 if (c
->lxc_conf
&& c
->lxc_conf
->rebootsignal
)
2020 rebootsignal
= c
->lxc_conf
->rebootsignal
;
2022 /* Add a new state client before sending the shutdown signal so that we
2023 * don't miss a state.
2026 states
[RUNNING
] = 2;
2027 ret
= lxc_cmd_add_state_client(c
->name
, c
->config_path
, states
,
2032 if (state_client_fd
< 0)
2038 if (ret
< MAX_STATE
)
2042 /* Send reboot signal to container. */
2043 killret
= kill(pid
, rebootsignal
);
2045 if (state_client_fd
>= 0)
2046 close(state_client_fd
);
2048 WARN("Failed to send signal %d to pid %d", rebootsignal
, pid
);
2051 TRACE("Sent signal %d to pid %d", rebootsignal
, pid
);
2056 ret
= lxc_cmd_sock_rcv_state(state_client_fd
, timeout
);
2057 close(state_client_fd
);
2061 TRACE("Received state \"%s\"", lxc_state2str(ret
));
2068 WRAP_API_1(bool, lxcapi_reboot2
, int)
2070 static bool do_lxcapi_shutdown(struct lxc_container
*c
, int timeout
)
2074 int haltsignal
= SIGPWR
, state_client_fd
= -EBADF
;
2075 lxc_state_t states
[MAX_STATE
] = {0};
2080 if (!do_lxcapi_is_running(c
))
2083 pid
= do_lxcapi_init_pid(c
);
2087 /* Detect whether we should send SIGRTMIN + 3 (e.g. systemd). */
2088 if (c
->lxc_conf
&& c
->lxc_conf
->haltsignal
)
2089 haltsignal
= c
->lxc_conf
->haltsignal
;
2090 else if (task_blocks_signal(pid
, (SIGRTMIN
+ 3)))
2091 haltsignal
= (SIGRTMIN
+ 3);
2093 /* Add a new state client before sending the shutdown signal so that we
2094 * don't miss a state.
2097 states
[STOPPED
] = 1;
2098 ret
= lxc_cmd_add_state_client(c
->name
, c
->config_path
, states
,
2103 if (state_client_fd
< 0)
2109 if (ret
< MAX_STATE
)
2113 /* Send shutdown signal to container. */
2114 killret
= kill(pid
, haltsignal
);
2116 if (state_client_fd
>= 0)
2117 close(state_client_fd
);
2119 WARN("Failed to send signal %d to pid %d", haltsignal
, pid
);
2122 TRACE("Sent signal %d to pid %d", haltsignal
, pid
);
2127 ret
= lxc_cmd_sock_rcv_state(state_client_fd
, timeout
);
2128 close(state_client_fd
);
2132 TRACE("Received state \"%s\"", lxc_state2str(ret
));
2139 WRAP_API_1(bool, lxcapi_shutdown
, int)
2141 static bool lxcapi_createl(struct lxc_container
*c
, const char *t
,
2142 const char *bdevtype
, struct bdev_specs
*specs
, int flags
, ...)
2151 current_config
= c
->lxc_conf
;
2154 * since we're going to wait for create to finish, I don't think we
2155 * need to get a copy of the arguments.
2157 va_start(ap
, flags
);
2158 args
= lxc_va_arg_list_to_argv(ap
, 0, 0);
2161 ERROR("Failed to allocate memory");
2165 bret
= do_lxcapi_create(c
, t
, bdevtype
, specs
, flags
, args
);
2169 current_config
= NULL
;
2173 static void do_clear_unexp_config_line(struct lxc_conf
*conf
, const char *key
)
2175 if (!strcmp(key
, "lxc.cgroup"))
2176 return clear_unexp_config_line(conf
, key
, true);
2178 if (!strcmp(key
, "lxc.network"))
2179 return clear_unexp_config_line(conf
, key
, true);
2181 if (!strcmp(key
, "lxc.net"))
2182 return clear_unexp_config_line(conf
, key
, true);
2184 /* Clear a network with a specific index. */
2185 if (!strncmp(key
, "lxc.net.", 8)) {
2190 ret
= lxc_safe_uint(idx
, &(unsigned int){0});
2192 return clear_unexp_config_line(conf
, key
, true);
2195 if (!strcmp(key
, "lxc.hook"))
2196 return clear_unexp_config_line(conf
, key
, true);
2198 return clear_unexp_config_line(conf
, key
, false);
2201 static bool do_lxcapi_clear_config_item(struct lxc_container
*c
,
2205 struct lxc_config_t
*config
;
2207 if (!c
|| !c
->lxc_conf
)
2210 if (container_mem_lock(c
))
2213 config
= lxc_get_config(key
);
2214 /* Verify that the config key exists and that it has a callback
2217 if (config
&& config
->clr
)
2218 ret
= config
->clr(key
, c
->lxc_conf
, NULL
);
2221 do_clear_unexp_config_line(c
->lxc_conf
, key
);
2223 container_mem_unlock(c
);
2227 WRAP_API_1(bool, lxcapi_clear_config_item
, const char *)
2229 static inline bool enter_net_ns(struct lxc_container
*c
)
2231 pid_t pid
= do_lxcapi_init_pid(c
);
2233 if ((geteuid() != 0 || (c
->lxc_conf
&& !lxc_list_empty(&c
->lxc_conf
->id_map
))) &&
2234 (access("/proc/self/ns/user", F_OK
) == 0))
2235 if (!switch_to_ns(pid
, "user"))
2238 return switch_to_ns(pid
, "net");
2241 /* Used by qsort and bsearch functions for comparing names. */
2242 static inline int string_cmp(char **first
, char **second
)
2244 return strcmp(*first
, *second
);
2247 /* Used by qsort and bsearch functions for comparing container names. */
2248 static inline int container_cmp(struct lxc_container
**first
,
2249 struct lxc_container
**second
)
2251 return strcmp((*first
)->name
, (*second
)->name
);
2254 static bool add_to_array(char ***names
, char *cname
, int pos
)
2256 char **newnames
= realloc(*names
, (pos
+1) * sizeof(char *));
2258 ERROR("Out of memory");
2263 newnames
[pos
] = strdup(cname
);
2267 /* Sort the array as we will use binary search on it. */
2268 qsort(newnames
, pos
+ 1, sizeof(char *),
2269 (int (*)(const void *, const void *))string_cmp
);
2274 static bool add_to_clist(struct lxc_container
***list
, struct lxc_container
*c
,
2277 struct lxc_container
**newlist
= realloc(*list
, (pos
+ 1) * sizeof(struct lxc_container
*));
2279 ERROR("Out of memory");
2286 /* Sort the array as we will use binary search on it. */
2288 qsort(newlist
, pos
+ 1, sizeof(struct lxc_container
*),
2289 (int (*)(const void *, const void *))container_cmp
);
2294 static char** get_from_array(char ***names
, char *cname
, int size
)
2296 return (char **)bsearch(&cname
, *names
, size
, sizeof(char *), (int (*)(const void *, const void *))string_cmp
);
2299 static bool array_contains(char ***names
, char *cname
, int size
)
2301 if(get_from_array(names
, cname
, size
) != NULL
)
2307 static bool remove_from_array(char ***names
, char *cname
, int size
)
2309 char **result
= get_from_array(names
, cname
, size
);
2310 if (result
!= NULL
) {
2318 static char **do_lxcapi_get_interfaces(struct lxc_container
*c
)
2321 int i
, count
= 0, pipefd
[2];
2322 char **interfaces
= NULL
;
2323 char interface
[IFNAMSIZ
];
2325 if (pipe2(pipefd
, O_CLOEXEC
) < 0)
2330 SYSERROR("Failed to fork task to get interfaces information");
2336 if (pid
== 0) { /* child */
2337 int ret
= 1, nbytes
;
2338 struct netns_ifaddrs
*interfaceArray
= NULL
, *tempIfAddr
= NULL
;
2340 /* close the read-end of the pipe */
2343 if (!enter_net_ns(c
)) {
2344 SYSERROR("Failed to enter network namespace");
2348 /* Grab the list of interfaces */
2349 if (netns_getifaddrs(&interfaceArray
, -1, &(bool){false})) {
2350 SYSERROR("Failed to get interfaces list");
2354 /* Iterate through the interfaces */
2355 for (tempIfAddr
= interfaceArray
; tempIfAddr
!= NULL
;
2356 tempIfAddr
= tempIfAddr
->ifa_next
) {
2357 nbytes
= lxc_write_nointr(pipefd
[1], tempIfAddr
->ifa_name
, IFNAMSIZ
);
2368 netns_freeifaddrs(interfaceArray
);
2370 /* close the write-end of the pipe, thus sending EOF to the reader */
2375 /* close the write-end of the pipe */
2378 while (lxc_read_nointr(pipefd
[0], &interface
, IFNAMSIZ
) == IFNAMSIZ
) {
2379 interface
[IFNAMSIZ
- 1] = '\0';
2381 if (array_contains(&interfaces
, interface
, count
))
2384 if (!add_to_array(&interfaces
, interface
, count
))
2385 ERROR("Failed to add \"%s\" to array", interface
);
2390 if (wait_for_pid(pid
) != 0) {
2391 for (i
= 0; i
< count
; i
++)
2392 free(interfaces
[i
]);
2398 /* close the read-end of the pipe */
2401 /* Append NULL to the array */
2403 interfaces
= (char **)lxc_append_null_to_array((void **)interfaces
, count
);
2408 WRAP_API(char **, lxcapi_get_interfaces
)
2410 static char **do_lxcapi_get_ips(struct lxc_container
*c
, const char *interface
,
2411 const char *family
, int scope
)
2416 char address
[INET6_ADDRSTRLEN
];
2418 char **addresses
= NULL
;
2420 ret
= pipe2(pipefd
, O_CLOEXEC
);
2422 SYSERROR("Failed to create pipe");
2428 SYSERROR("Failed to create new process");
2436 char addressOutputBuffer
[INET6_ADDRSTRLEN
];
2437 char *address_ptr
= NULL
;
2438 void *tempAddrPtr
= NULL
;
2439 struct netns_ifaddrs
*interfaceArray
= NULL
, *tempIfAddr
= NULL
;
2441 /* close the read-end of the pipe */
2444 if (!enter_net_ns(c
)) {
2445 SYSERROR("Failed to attach to network namespace");
2449 /* Grab the list of interfaces */
2450 if (netns_getifaddrs(&interfaceArray
, -1, &(bool){false})) {
2451 SYSERROR("Failed to get interfaces list");
2455 /* Iterate through the interfaces */
2456 for (tempIfAddr
= interfaceArray
; tempIfAddr
;
2457 tempIfAddr
= tempIfAddr
->ifa_next
) {
2458 if (tempIfAddr
->ifa_addr
== NULL
)
2461 #pragma GCC diagnostic push
2462 #pragma GCC diagnostic ignored "-Wcast-align"
2464 if (tempIfAddr
->ifa_addr
->sa_family
== AF_INET
) {
2465 if (family
&& strcmp(family
, "inet"))
2468 tempAddrPtr
= &((struct sockaddr_in
*)tempIfAddr
->ifa_addr
)->sin_addr
;
2470 if (family
&& strcmp(family
, "inet6"))
2473 if (((struct sockaddr_in6
*)tempIfAddr
->ifa_addr
)->sin6_scope_id
!= scope
)
2476 tempAddrPtr
= &((struct sockaddr_in6
*)tempIfAddr
->ifa_addr
)->sin6_addr
;
2479 #pragma GCC diagnostic pop
2481 if (interface
&& strcmp(interface
, tempIfAddr
->ifa_name
))
2483 else if (!interface
&& strcmp("lo", tempIfAddr
->ifa_name
) == 0)
2486 address_ptr
= (char *)inet_ntop(tempIfAddr
->ifa_addr
->sa_family
,
2487 tempAddrPtr
, addressOutputBuffer
,
2488 sizeof(addressOutputBuffer
));
2492 nbytes
= lxc_write_nointr(pipefd
[1], address_ptr
, INET6_ADDRSTRLEN
);
2493 if (nbytes
!= INET6_ADDRSTRLEN
) {
2494 SYSERROR("Failed to send ipv6 address \"%s\"",
2506 netns_freeifaddrs(interfaceArray
);
2508 /* close the write-end of the pipe, thus sending EOF to the reader */
2513 /* close the write-end of the pipe */
2516 while (lxc_read_nointr(pipefd
[0], &address
, INET6_ADDRSTRLEN
) == INET6_ADDRSTRLEN
) {
2517 address
[INET6_ADDRSTRLEN
- 1] = '\0';
2519 if (!add_to_array(&addresses
, address
, count
))
2520 ERROR("PARENT: add_to_array failed");
2525 if (wait_for_pid(pid
) != 0) {
2526 for (i
= 0; i
< count
; i
++)
2533 /* close the read-end of the pipe */
2536 /* Append NULL to the array */
2538 addresses
= (char **)lxc_append_null_to_array((void **)addresses
, count
);
2543 WRAP_API_3(char **, lxcapi_get_ips
, const char *, const char *, int)
2545 static int do_lxcapi_get_config_item(struct lxc_container
*c
, const char *key
, char *retv
, int inlen
)
2548 struct lxc_config_t
*config
;
2550 if (!c
|| !c
->lxc_conf
)
2553 if (container_mem_lock(c
))
2556 config
= lxc_get_config(key
);
2557 /* Verify that the config key exists and that it has a callback
2560 if (config
&& config
->get
)
2561 ret
= config
->get(key
, retv
, inlen
, c
->lxc_conf
, NULL
);
2563 container_mem_unlock(c
);
2567 WRAP_API_3(int, lxcapi_get_config_item
, const char *, char *, int)
2569 static char* do_lxcapi_get_running_config_item(struct lxc_container
*c
, const char *key
)
2573 if (!c
|| !c
->lxc_conf
)
2576 if (container_mem_lock(c
))
2579 ret
= lxc_cmd_get_config_item(c
->name
, key
, do_lxcapi_get_config_path(c
));
2580 container_mem_unlock(c
);
2584 WRAP_API_1(char *, lxcapi_get_running_config_item
, const char *)
2586 static int do_lxcapi_get_keys(struct lxc_container
*c
, const char *key
, char *retv
, int inlen
)
2590 /* List all config items. */
2592 return lxc_list_config_items(retv
, inlen
);
2594 if (!c
|| !c
->lxc_conf
)
2597 if (container_mem_lock(c
))
2600 /* Support 'lxc.net.<idx>', i.e. 'lxc.net.0'
2601 * This is an intelligent result to show which keys are valid given the
2602 * type of nic it is.
2604 if (strncmp(key
, "lxc.net.", 8) == 0)
2605 ret
= lxc_list_net(c
->lxc_conf
, key
, retv
, inlen
);
2607 ret
= lxc_list_subkeys(c
->lxc_conf
, key
, retv
, inlen
);
2609 container_mem_unlock(c
);
2613 WRAP_API_3(int, lxcapi_get_keys
, const char *, char *, int)
2615 static bool do_lxcapi_save_config(struct lxc_container
*c
, const char *alt_file
)
2618 bool ret
= false, need_disklock
= false;
2621 alt_file
= c
->configfile
;
2626 /* If we haven't yet loaded a config, load the stock config. */
2628 if (!do_lxcapi_load_config(c
, lxc_global_config_value("lxc.default_config"))) {
2629 ERROR("Error loading default configuration file %s "
2631 lxc_global_config_value("lxc.default_config"),
2637 if (!create_container_dir(c
))
2640 /* If we're writing to the container's config file, take the disk lock.
2641 * Otherwise just take the memlock to protect the struct lxc_container
2642 * while we're traversing it.
2644 if (strcmp(c
->configfile
, alt_file
) == 0)
2645 need_disklock
= true;
2648 lret
= container_disk_lock(c
);
2650 lret
= container_mem_lock(c
);
2654 fd
= open(alt_file
, O_WRONLY
| O_CREAT
| O_TRUNC
| O_CLOEXEC
,
2655 S_IRUSR
| S_IWUSR
| S_IRGRP
| S_IWGRP
);
2659 lret
= write_config(fd
, c
->lxc_conf
);
2668 container_disk_unlock(c
);
2670 container_mem_unlock(c
);
2675 WRAP_API_1(bool, lxcapi_save_config
, const char *)
2678 static bool mod_rdep(struct lxc_container
*c0
, struct lxc_container
*c
, bool inc
)
2684 char path
[PATH_MAX
];
2685 char newpath
[PATH_MAX
];
2686 int fd
, ret
, n
= 0, v
= 0;
2688 size_t len
= 0, bytes
= 0;
2690 if (container_disk_lock(c0
))
2693 ret
= snprintf(path
, PATH_MAX
, "%s/%s/lxc_snapshots", c0
->config_path
, c0
->name
);
2694 if (ret
< 0 || ret
> PATH_MAX
)
2697 ret
= snprintf(newpath
, PATH_MAX
, "%s\n%s\n", c
->config_path
, c
->name
);
2698 if (ret
< 0 || ret
> PATH_MAX
)
2701 /* If we find an lxc-snapshot file using the old format only listing the
2702 * number of snapshots we will keep using it. */
2703 f1
= fopen(path
, "r");
2705 n
= fscanf(f1
, "%d", &v
);
2707 if (n
== 1 && v
== 0) {
2710 SYSERROR("Failed to remove \"%s\"", path
);
2718 f1
= fopen(path
, "w");
2722 if (fprintf(f1
, "%d\n", v
) < 0) {
2723 ERROR("Error writing new snapshots value");
2730 SYSERROR("Error writing to or closing snapshots file");
2734 /* Here we know that we have or can use an lxc-snapshot file
2735 * using the new format. */
2737 f1
= fopen(path
, "a");
2741 if (fprintf(f1
, "%s", newpath
) < 0) {
2742 ERROR("Error writing new snapshots entry");
2745 SYSERROR("Error writing to or closing snapshots file");
2751 SYSERROR("Error writing to or closing snapshots file");
2755 if ((fd
= open(path
, O_RDWR
| O_CLOEXEC
)) < 0)
2758 if (fstat(fd
, &fbuf
) < 0) {
2763 if (fbuf
.st_size
!= 0) {
2764 buf
= lxc_strmmap(NULL
, fbuf
.st_size
, PROT_READ
| PROT_WRITE
, MAP_SHARED
, fd
, 0);
2765 if (buf
== MAP_FAILED
) {
2766 SYSERROR("Failed to create mapping %s", path
);
2771 len
= strlen(newpath
);
2772 while ((del
= strstr((char *)buf
, newpath
))) {
2773 memmove(del
, del
+ len
, strlen(del
) - len
+ 1);
2777 lxc_strmunmap(buf
, fbuf
.st_size
);
2778 if (ftruncate(fd
, fbuf
.st_size
- bytes
) < 0) {
2779 SYSERROR("Failed to truncate file %s", path
);
2788 /* If the lxc-snapshot file is empty, remove it. */
2789 if (stat(path
, &fbuf
) < 0)
2792 if (!fbuf
.st_size
) {
2795 SYSERROR("Failed to remove \"%s\"", path
);
2802 container_disk_unlock(c0
);
2806 void mod_all_rdeps(struct lxc_container
*c
, bool inc
)
2808 struct lxc_container
*p
;
2809 char *lxcpath
= NULL
, *lxcname
= NULL
, path
[PATH_MAX
];
2810 size_t pathlen
= 0, namelen
= 0;
2814 ret
= snprintf(path
, PATH_MAX
, "%s/%s/lxc_rdepends",
2815 c
->config_path
, c
->name
);
2816 if (ret
< 0 || ret
>= PATH_MAX
) {
2817 ERROR("Path name too long");
2821 f
= fopen(path
, "r");
2825 while (getline(&lxcpath
, &pathlen
, f
) != -1) {
2826 if (getline(&lxcname
, &namelen
, f
) == -1) {
2827 ERROR("badly formatted file %s", path
);
2831 remove_trailing_newlines(lxcpath
);
2832 remove_trailing_newlines(lxcname
);
2834 if ((p
= lxc_container_new(lxcname
, lxcpath
)) == NULL
) {
2835 ERROR("Unable to find dependent container %s:%s",
2840 if (!mod_rdep(p
, c
, inc
))
2841 ERROR("Failed to update snapshots file for %s:%s",
2844 lxc_container_put(p
);
2853 static bool has_fs_snapshots(struct lxc_container
*c
)
2856 char path
[PATH_MAX
];
2861 ret
= snprintf(path
, PATH_MAX
, "%s/%s/lxc_snapshots", c
->config_path
,
2863 if (ret
< 0 || ret
> PATH_MAX
)
2866 /* If the file doesn't exist there are no snapshots. */
2867 if (stat(path
, &fbuf
) < 0)
2872 f
= fopen(path
, "r");
2876 ret
= fscanf(f
, "%d", &v
);
2878 /* TODO: Figure out what to do with the return value of fscanf. */
2880 INFO("Container uses new lxc-snapshots format %s", path
);
2889 static bool has_snapshots(struct lxc_container
*c
)
2891 char path
[PATH_MAX
];
2892 struct dirent
*direntp
;
2896 if (!get_snappath_dir(c
, path
))
2899 dir
= opendir(path
);
2903 while ((direntp
= readdir(dir
))) {
2904 if (!strcmp(direntp
->d_name
, "."))
2907 if (!strcmp(direntp
->d_name
, ".."))
2917 static bool do_destroy_container(struct lxc_conf
*conf
) {
2920 if (am_guest_unpriv()) {
2921 ret
= userns_exec_full(conf
, storage_destroy_wrapper
, conf
,
2922 "storage_destroy_wrapper");
2929 return storage_destroy(conf
);
2932 static int lxc_rmdir_onedev_wrapper(void *data
)
2934 char *arg
= (char *) data
;
2935 return lxc_rmdir_onedev(arg
, "snaps");
2938 static int lxc_unlink_exec_wrapper(void *data
)
2944 static bool container_destroy(struct lxc_container
*c
,
2945 struct lxc_storage
*storage
)
2949 struct lxc_conf
*conf
;
2954 if (!c
|| !do_lxcapi_is_defined(c
))
2958 if (container_disk_lock(c
))
2961 if (!is_stopped(c
)) {
2962 /* We should queue some sort of error - in c->error_string? */
2963 ERROR("container %s is not stopped", c
->name
);
2967 if (conf
&& !lxc_list_empty(&conf
->hooks
[LXCHOOK_DESTROY
])) {
2968 /* Start of environment variable setup for hooks */
2969 if (setenv("LXC_NAME", c
->name
, 1))
2970 SYSERROR("Failed to set environment variable for container name");
2972 if (conf
->rcfile
&& setenv("LXC_CONFIG_FILE", conf
->rcfile
, 1))
2973 SYSERROR("Failed to set environment variable for config path");
2975 if (conf
->rootfs
.mount
&& setenv("LXC_ROOTFS_MOUNT", conf
->rootfs
.mount
, 1))
2976 SYSERROR("Failed to set environment variable for rootfs mount");
2978 if (conf
->rootfs
.path
&& setenv("LXC_ROOTFS_PATH", conf
->rootfs
.path
, 1))
2979 SYSERROR("Failed to set environment variable for rootfs mount");
2981 if (conf
->console
.path
&& setenv("LXC_CONSOLE", conf
->console
.path
, 1))
2982 SYSERROR("Failed to set environment variable for console path");
2984 if (conf
->console
.log_path
&& setenv("LXC_CONSOLE_LOGPATH", conf
->console
.log_path
, 1))
2985 SYSERROR("Failed to set environment variable for console log");
2986 /* End of environment variable setup for hooks */
2988 if (run_lxc_hooks(c
->name
, "destroy", conf
, NULL
)) {
2989 ERROR("Failed to execute clone hook for \"%s\"", c
->name
);
2994 if (current_config
&& conf
== current_config
) {
2995 current_config
= NULL
;
2997 if (conf
->logfd
!= -1) {
3003 /* LXC is not managing the storage of the container. */
3004 if (conf
&& !conf
->rootfs
.managed
)
3007 if (conf
&& conf
->rootfs
.path
&& conf
->rootfs
.mount
) {
3008 if (!do_destroy_container(conf
)) {
3009 ERROR("Error destroying rootfs for %s", c
->name
);
3012 INFO("Destroyed rootfs for %s", c
->name
);
3015 mod_all_rdeps(c
, false);
3017 p1
= do_lxcapi_get_config_path(c
);
3026 * strlen("config") = 6
3030 len
= strlen(p1
) + 1 + strlen(c
->name
) + 1 + 6 + 1;
3033 ERROR("Failed to allocate memory");
3037 /* For an overlay container the rootfs is considered immutable and
3038 * cannot be removed when restoring from a snapshot.
3040 if (storage
&& (!strcmp(storage
->type
, "overlay") ||
3041 !strcmp(storage
->type
, "overlayfs")) &&
3042 (storage
->flags
& LXC_STORAGE_INTERNAL_OVERLAY_RESTORE
)) {
3043 ret
= snprintf(path
, len
, "%s/%s/config", p1
, c
->name
);
3044 if (ret
< 0 || (size_t)ret
>= len
)
3047 if (am_guest_unpriv())
3048 ret
= userns_exec_1(conf
, lxc_unlink_exec_wrapper
, path
,
3049 "lxc_unlink_exec_wrapper");
3053 SYSERROR("Failed to destroy config file \"%s\" for \"%s\"",
3057 INFO("Destroyed config file \"%s\" for \"%s\"", path
, c
->name
);
3063 ret
= snprintf(path
, len
, "%s/%s", p1
, c
->name
);
3064 if (ret
< 0 || (size_t)ret
>= len
)
3067 if (am_guest_unpriv())
3068 ret
= userns_exec_full(conf
, lxc_rmdir_onedev_wrapper
, path
,
3069 "lxc_rmdir_onedev_wrapper");
3071 ret
= lxc_rmdir_onedev(path
, "snaps");
3073 ERROR("Failed to destroy directory \"%s\" for \"%s\"", path
,
3077 INFO("Destroyed directory \"%s\" for \"%s\"", path
, c
->name
);
3086 container_disk_unlock(c
);
3090 static bool do_lxcapi_destroy(struct lxc_container
*c
)
3092 if (!c
|| !lxcapi_is_defined(c
))
3095 if (c
->lxc_conf
&& c
->lxc_conf
->rootfs
.managed
) {
3096 if (has_snapshots(c
)) {
3097 ERROR("Container %s has snapshots; not removing", c
->name
);
3101 if (has_fs_snapshots(c
)) {
3102 ERROR("container %s has snapshots on its rootfs", c
->name
);
3107 return container_destroy(c
, NULL
);
3110 WRAP_API(bool, lxcapi_destroy
)
3112 static bool do_lxcapi_destroy_with_snapshots(struct lxc_container
*c
)
3114 if (!c
|| !lxcapi_is_defined(c
))
3117 if (!lxcapi_snapshot_destroy_all(c
)) {
3118 ERROR("Error deleting all snapshots");
3122 return lxcapi_destroy(c
);
3125 WRAP_API(bool, lxcapi_destroy_with_snapshots
)
3127 int lxc_set_config_item_locked(struct lxc_conf
*conf
, const char *key
,
3131 struct lxc_config_t
*config
;
3134 config
= lxc_get_config(key
);
3138 ret
= config
->set(key
, v
, conf
, NULL
);
3142 if (lxc_config_value_empty(v
))
3143 do_clear_unexp_config_line(conf
, key
);
3145 bret
= do_append_unexp_config_line(conf
, key
, v
);
3152 static bool do_set_config_item_locked(struct lxc_container
*c
, const char *key
,
3158 c
->lxc_conf
= lxc_conf_init();
3163 ret
= lxc_set_config_item_locked(c
->lxc_conf
, key
, v
);
3170 static bool do_lxcapi_set_config_item(struct lxc_container
*c
, const char *key
, const char *v
)
3177 if (container_mem_lock(c
))
3180 b
= do_set_config_item_locked(c
, key
, v
);
3182 container_mem_unlock(c
);
3186 WRAP_API_2(bool, lxcapi_set_config_item
, const char *, const char *)
3188 static char *lxcapi_config_file_name(struct lxc_container
*c
)
3190 if (!c
|| !c
->configfile
)
3193 return strdup(c
->configfile
);
3196 static const char *lxcapi_get_config_path(struct lxc_container
*c
)
3198 if (!c
|| !c
->config_path
)
3201 return (const char *)(c
->config_path
);
3206 * Just recalculate the c->configfile based on the
3207 * c->config_path, which must be set.
3208 * The lxc_container must be locked or not yet public.
3210 static bool set_config_filename(struct lxc_container
*c
)
3215 if (!c
->config_path
)
3218 /* $lxc_path + "/" + c->name + "/" + "config" + '\0' */
3219 len
= strlen(c
->config_path
) + strlen(c
->name
) + strlen("config") + 3;
3220 newpath
= malloc(len
);
3224 ret
= snprintf(newpath
, len
, "%s/%s/config", c
->config_path
, c
->name
);
3225 if (ret
< 0 || ret
>= len
) {
3226 fprintf(stderr
, "Error printing out config file name\n");
3231 free(c
->configfile
);
3232 c
->configfile
= newpath
;
3237 static bool do_lxcapi_set_config_path(struct lxc_container
*c
, const char *path
)
3241 char *oldpath
= NULL
;
3246 if (container_mem_lock(c
))
3251 ERROR("Out of memory setting new lxc path");
3257 oldpath
= c
->config_path
;
3260 /* Since we've changed the config path, we have to change the
3261 * config file name too */
3262 if (!set_config_filename(c
)) {
3263 ERROR("Out of memory setting new config filename");
3265 free(c
->config_path
);
3266 c
->config_path
= oldpath
;
3272 container_mem_unlock(c
);
3276 WRAP_API_1(bool, lxcapi_set_config_path
, const char *)
3278 static bool do_lxcapi_set_cgroup_item(struct lxc_container
*c
, const char *subsys
, const char *value
)
3281 struct cgroup_ops
*cgroup_ops
;
3289 cgroup_ops
= cgroup_init(c
->lxc_conf
);
3293 ret
= cgroup_ops
->set(cgroup_ops
, subsys
, value
, c
->name
, c
->config_path
);
3295 cgroup_exit(cgroup_ops
);
3300 WRAP_API_2(bool, lxcapi_set_cgroup_item
, const char *, const char *)
3302 static int do_lxcapi_get_cgroup_item(struct lxc_container
*c
, const char *subsys
, char *retv
, int inlen
)
3305 struct cgroup_ops
*cgroup_ops
;
3313 cgroup_ops
= cgroup_init(c
->lxc_conf
);
3317 ret
= cgroup_ops
->get(cgroup_ops
, subsys
, retv
, inlen
, c
->name
,
3320 cgroup_exit(cgroup_ops
);
3325 WRAP_API_3(int, lxcapi_get_cgroup_item
, const char *, char *, int)
3327 const char *lxc_get_global_config_item(const char *key
)
3329 return lxc_global_config_value(key
);
3332 const char *lxc_get_version(void)
3337 static int copy_file(const char *old
, const char *new)
3344 if (file_exists(new)) {
3345 ERROR("copy destination %s exists", new);
3349 ret
= stat(old
, &sbuf
);
3351 INFO("Error stat'ing %s", old
);
3355 in
= open(old
, O_RDONLY
);
3357 SYSERROR("Error opening original file %s", old
);
3361 out
= open(new, O_CREAT
| O_EXCL
| O_WRONLY
, 0644);
3363 SYSERROR("Error opening new file %s", new);
3369 len
= lxc_read_nointr(in
, buf
, 8096);
3371 SYSERROR("Error reading old file %s", old
);
3378 ret
= lxc_write_nointr(out
, buf
, len
);
3379 if (ret
< len
) { /* should we retry? */
3380 SYSERROR("Error: write to new file %s was interrupted", new);
3388 /* We set mode, but not owner/group. */
3389 ret
= chmod(new, sbuf
.st_mode
);
3391 SYSERROR("Error setting mode on %s", new);
3403 static int copyhooks(struct lxc_container
*oldc
, struct lxc_container
*c
)
3405 __do_free
char *cpath
;
3407 struct lxc_list
*it
;
3409 len
= strlen(oldc
->config_path
) + strlen(oldc
->name
) + 3;
3410 cpath
= must_realloc(NULL
, len
);
3411 ret
= snprintf(cpath
, len
, "%s/%s/", oldc
->config_path
, oldc
->name
);
3412 if (ret
< 0 || ret
>= len
)
3415 for (i
=0; i
<NUM_LXC_HOOKS
; i
++) {
3416 lxc_list_for_each(it
, &c
->lxc_conf
->hooks
[i
]) {
3417 char *hookname
= it
->elem
;
3418 char *fname
= strrchr(hookname
, '/');
3419 char tmppath
[PATH_MAX
];
3420 if (!fname
) /* relative path - we don't support, but maybe we should */
3423 if (strncmp(hookname
, cpath
, len
- 1) != 0) {
3424 /* this hook is public - ignore */
3428 /* copy the script, and change the entry in confile */
3429 ret
= snprintf(tmppath
, PATH_MAX
, "%s/%s/%s",
3430 c
->config_path
, c
->name
, fname
+1);
3431 if (ret
< 0 || ret
>= PATH_MAX
)
3434 ret
= copy_file(it
->elem
, tmppath
);
3440 it
->elem
= strdup(tmppath
);
3442 ERROR("out of memory copying hook path");
3448 if (!clone_update_unexp_hooks(c
->lxc_conf
, oldc
->config_path
,
3449 c
->config_path
, oldc
->name
, c
->name
)) {
3450 ERROR("Error saving new hooks in clone");
3454 do_lxcapi_save_config(c
, NULL
);
3459 static int copy_fstab(struct lxc_container
*oldc
, struct lxc_container
*c
)
3461 char newpath
[PATH_MAX
];
3462 char *oldpath
= oldc
->lxc_conf
->fstab
;
3468 clear_unexp_config_line(c
->lxc_conf
, "lxc.mount.fstab", false);
3470 char *p
= strrchr(oldpath
, '/');
3474 ret
= snprintf(newpath
, PATH_MAX
, "%s/%s%s",
3475 c
->config_path
, c
->name
, p
);
3476 if (ret
< 0 || ret
>= PATH_MAX
) {
3477 ERROR("error printing new path for %s", oldpath
);
3481 if (file_exists(newpath
)) {
3482 ERROR("error: fstab file %s exists", newpath
);
3486 if (copy_file(oldpath
, newpath
) < 0) {
3487 ERROR("error: copying %s to %s", oldpath
, newpath
);
3491 free(c
->lxc_conf
->fstab
);
3493 c
->lxc_conf
->fstab
= strdup(newpath
);
3494 if (!c
->lxc_conf
->fstab
) {
3495 ERROR("error: allocating pathname");
3499 if (!do_append_unexp_config_line(c
->lxc_conf
, "lxc.mount.fstab", newpath
)) {
3500 ERROR("error saving new lxctab");
3507 static void copy_rdepends(struct lxc_container
*c
, struct lxc_container
*c0
)
3509 char path0
[PATH_MAX
], path1
[PATH_MAX
];
3512 ret
= snprintf(path0
, PATH_MAX
, "%s/%s/lxc_rdepends", c0
->config_path
,
3514 if (ret
< 0 || ret
>= PATH_MAX
) {
3515 WARN("Error copying reverse dependencies");
3519 ret
= snprintf(path1
, PATH_MAX
, "%s/%s/lxc_rdepends", c
->config_path
,
3521 if (ret
< 0 || ret
>= PATH_MAX
) {
3522 WARN("Error copying reverse dependencies");
3526 if (copy_file(path0
, path1
) < 0) {
3527 INFO("Error copying reverse dependencies");
3532 static bool add_rdepends(struct lxc_container
*c
, struct lxc_container
*c0
)
3535 char path
[PATH_MAX
];
3539 ret
= snprintf(path
, PATH_MAX
, "%s/%s/lxc_rdepends", c
->config_path
,
3541 if (ret
< 0 || ret
>= PATH_MAX
)
3544 f
= fopen(path
, "a");
3550 /* If anything goes wrong, just return an error. */
3551 if (fprintf(f
, "%s\n%s\n", c0
->config_path
, c0
->name
) < 0)
3561 * If the fs natively supports snapshot clones with no penalty,
3562 * then default to those even if not requested.
3563 * Currently we only do this for btrfs.
3565 bool should_default_to_snapshot(struct lxc_container
*c0
,
3566 struct lxc_container
*c1
)
3568 __do_free
char *p0
, *p1
;
3570 size_t l0
= strlen(c0
->config_path
) + strlen(c0
->name
) + 2;
3571 size_t l1
= strlen(c1
->config_path
) + strlen(c1
->name
) + 2;
3572 char *rootfs
= c0
->lxc_conf
->rootfs
.path
;
3574 p0
= must_realloc(NULL
, l0
+ 1);
3575 p1
= must_realloc(NULL
, l1
+ 1);
3576 ret
= snprintf(p0
, l0
, "%s/%s", c0
->config_path
, c0
->name
);
3577 if (ret
< 0 || ret
>= l0
)
3580 ret
= snprintf(p1
, l1
, "%s/%s", c1
->config_path
, c1
->name
);
3581 if (ret
< 0 || ret
>= l1
)
3584 if (!is_btrfs_fs(p0
) || !is_btrfs_fs(p1
))
3587 if (is_btrfs_subvol(rootfs
) <= 0)
3590 return btrfs_same_fs(p0
, p1
) == 0;
3593 static int copy_storage(struct lxc_container
*c0
, struct lxc_container
*c
,
3594 const char *newtype
, int flags
, const char *bdevdata
,
3597 struct lxc_storage
*bdev
;
3600 if (should_default_to_snapshot(c0
, c
))
3601 flags
|= LXC_CLONE_SNAPSHOT
;
3603 bdev
= storage_copy(c0
, c
->name
, c
->config_path
, newtype
, flags
,
3604 bdevdata
, newsize
, &need_rdep
);
3606 ERROR("Error copying storage.");
3610 /* Set new rootfs. */
3611 free(c
->lxc_conf
->rootfs
.path
);
3612 c
->lxc_conf
->rootfs
.path
= strdup(bdev
->src
);
3615 if (!c
->lxc_conf
->rootfs
.path
) {
3616 ERROR("Out of memory while setting storage path.");
3620 /* Append a new lxc.rootfs.path entry to the unexpanded config. */
3621 clear_unexp_config_line(c
->lxc_conf
, "lxc.rootfs.path", false);
3622 if (!do_append_unexp_config_line(c
->lxc_conf
, "lxc.rootfs.path",
3623 c
->lxc_conf
->rootfs
.path
)) {
3624 ERROR("Error saving new rootfs to cloned config.");
3628 if (flags
& LXC_CLONE_SNAPSHOT
)
3629 copy_rdepends(c
, c0
);
3632 if (!add_rdepends(c
, c0
))
3633 WARN("Error adding reverse dependency from %s to %s",
3637 mod_all_rdeps(c
, true);
3642 struct clone_update_data
{
3643 struct lxc_container
*c0
;
3644 struct lxc_container
*c1
;
3649 static int clone_update_rootfs(struct clone_update_data
*data
)
3651 struct lxc_container
*c0
= data
->c0
;
3652 struct lxc_container
*c
= data
->c1
;
3653 int flags
= data
->flags
;
3654 char **hookargs
= data
->hookargs
;
3656 char path
[PATH_MAX
];
3657 struct lxc_storage
*bdev
;
3659 struct lxc_conf
*conf
= c
->lxc_conf
;
3661 /* update hostname in rootfs */
3662 /* we're going to mount, so run in a clean namespace to simplify cleanup */
3664 if (setgid(0) < 0) {
3665 ERROR("Failed to setgid to 0");
3669 if (setuid(0) < 0) {
3670 ERROR("Failed to setuid to 0");
3674 if (setgroups(0, NULL
) < 0)
3675 WARN("Failed to clear groups");
3677 if (unshare(CLONE_NEWNS
) < 0)
3680 bdev
= storage_init(c
->lxc_conf
);
3684 if (strcmp(bdev
->type
, "dir") != 0) {
3685 if (unshare(CLONE_NEWNS
) < 0) {
3686 ERROR("error unsharing mounts");
3691 if (detect_shared_rootfs()) {
3692 if (mount(NULL
, "/", NULL
, MS_SLAVE
|MS_REC
, NULL
)) {
3693 SYSERROR("Failed to make / rslave");
3694 ERROR("Continuing...");
3698 if (bdev
->ops
->mount(bdev
) < 0) {
3702 } else { /* TODO come up with a better way */
3704 bdev
->dest
= strdup(lxc_storage_get_path(bdev
->src
, bdev
->type
));
3707 if (!lxc_list_empty(&conf
->hooks
[LXCHOOK_CLONE
])) {
3708 /* Start of environment variable setup for hooks */
3709 if (c0
->name
&& setenv("LXC_SRC_NAME", c0
->name
, 1))
3710 SYSERROR("failed to set environment variable for source container name");
3712 if (setenv("LXC_NAME", c
->name
, 1))
3713 SYSERROR("failed to set environment variable for container name");
3715 if (conf
->rcfile
&& setenv("LXC_CONFIG_FILE", conf
->rcfile
, 1))
3716 SYSERROR("failed to set environment variable for config path");
3718 if (bdev
->dest
&& setenv("LXC_ROOTFS_MOUNT", bdev
->dest
, 1))
3719 SYSERROR("failed to set environment variable for rootfs mount");
3721 if (conf
->rootfs
.path
&& setenv("LXC_ROOTFS_PATH", conf
->rootfs
.path
, 1))
3722 SYSERROR("failed to set environment variable for rootfs mount");
3724 if (run_lxc_hooks(c
->name
, "clone", conf
, hookargs
)) {
3725 ERROR("Error executing clone hook for %s", c
->name
);
3731 if (!(flags
& LXC_CLONE_KEEPNAME
)) {
3732 ret
= snprintf(path
, PATH_MAX
, "%s/etc/hostname", bdev
->dest
);
3735 if (ret
< 0 || ret
>= PATH_MAX
)
3738 if (!file_exists(path
))
3741 if (!(fout
= fopen(path
, "w"))) {
3742 SYSERROR("unable to open %s: ignoring", path
);
3746 if (fprintf(fout
, "%s", c
->name
) < 0) {
3751 if (fclose(fout
) < 0)
3760 static int clone_update_rootfs_wrapper(void *data
)
3762 struct clone_update_data
*arg
= (struct clone_update_data
*) data
;
3763 return clone_update_rootfs(arg
);
3767 * We want to support:
3768 sudo lxc-clone -o o1 -n n1 -s -L|-fssize fssize -v|--vgname vgname \
3769 -p|--lvprefix lvprefix -t|--fstype fstype -B backingstore
3771 -s [ implies overlay]
3774 only rootfs gets converted (copied/snapshotted) on clone.
3777 static int create_file_dirname(char *path
, struct lxc_conf
*conf
)
3779 char *p
= strrchr(path
, '/');
3786 ret
= do_create_container_dir(path
, conf
);
3792 static struct lxc_container
*do_lxcapi_clone(struct lxc_container
*c
, const char *newname
,
3793 const char *lxcpath
, int flags
,
3794 const char *bdevtype
, const char *bdevdata
, uint64_t newsize
,
3797 char newpath
[PATH_MAX
];
3799 struct clone_update_data data
;
3800 size_t saved_unexp_len
;
3802 int storage_copied
= 0;
3803 char *origroot
= NULL
, *saved_unexp_conf
= NULL
;
3804 struct lxc_container
*c2
= NULL
;
3806 if (!c
|| !do_lxcapi_is_defined(c
))
3809 if (container_mem_lock(c
))
3811 if (!is_stopped(c
) && !(flags
& LXC_CLONE_ALLOW_RUNNING
)) {
3812 ERROR("error: Original container (%s) is running. Use --allowrunning if you want to force a snapshot of the running container.", c
->name
);
3816 /* Make sure the container doesn't yet exist. */
3821 lxcpath
= do_lxcapi_get_config_path(c
);
3823 ret
= snprintf(newpath
, PATH_MAX
, "%s/%s/config", lxcpath
, newname
);
3824 if (ret
< 0 || ret
>= PATH_MAX
) {
3825 SYSERROR("clone: failed making config pathname");
3829 if (file_exists(newpath
)) {
3830 ERROR("error: clone: %s exists", newpath
);
3834 ret
= create_file_dirname(newpath
, c
->lxc_conf
);
3835 if (ret
< 0 && errno
!= EEXIST
) {
3836 ERROR("Error creating container dir for %s", newpath
);
3840 /* Copy the configuration. Tweak it as needed. */
3841 if (c
->lxc_conf
->rootfs
.path
) {
3842 origroot
= c
->lxc_conf
->rootfs
.path
;
3843 c
->lxc_conf
->rootfs
.path
= NULL
;
3846 fd
= open(newpath
, O_WRONLY
| O_CREAT
| O_CLOEXEC
,
3847 S_IRUSR
| S_IWUSR
| S_IRGRP
| S_IWGRP
);
3849 SYSERROR("Failed to open \"%s\"", newpath
);
3853 saved_unexp_conf
= c
->lxc_conf
->unexpanded_config
;
3854 saved_unexp_len
= c
->lxc_conf
->unexpanded_len
;
3855 c
->lxc_conf
->unexpanded_config
= strdup(saved_unexp_conf
);
3856 if (!c
->lxc_conf
->unexpanded_config
) {
3861 clear_unexp_config_line(c
->lxc_conf
, "lxc.rootfs.path", false);
3862 write_config(fd
, c
->lxc_conf
);
3865 c
->lxc_conf
->rootfs
.path
= origroot
;
3867 free(c
->lxc_conf
->unexpanded_config
);
3868 c
->lxc_conf
->unexpanded_config
= saved_unexp_conf
;
3869 saved_unexp_conf
= NULL
;
3870 c
->lxc_conf
->unexpanded_len
= saved_unexp_len
;
3872 ret
= snprintf(newpath
, PATH_MAX
, "%s/%s/rootfs", lxcpath
, newname
);
3873 if (ret
< 0 || ret
>= PATH_MAX
) {
3874 SYSERROR("clone: failed making rootfs pathname");
3878 ret
= mkdir(newpath
, 0755);
3880 /* For an overlay container the rootfs is considered immutable
3881 * and will not have been removed when restoring from a
3884 if (errno
!= ENOENT
&&
3885 !(flags
& LXC_STORAGE_INTERNAL_OVERLAY_RESTORE
)) {
3886 SYSERROR("Failed to create directory \"%s\"", newpath
);
3891 if (am_guest_unpriv()) {
3892 if (chown_mapped_root(newpath
, c
->lxc_conf
) < 0) {
3893 ERROR("Error chowning %s to container root", newpath
);
3898 c2
= lxc_container_new(newname
, lxcpath
);
3900 ERROR("clone: failed to create new container (%s %s)", newname
,
3905 /* copy/snapshot rootfs's */
3906 ret
= copy_storage(c
, c2
, bdevtype
, flags
, bdevdata
, newsize
);
3910 /* update utsname */
3911 if (!(flags
& LXC_CLONE_KEEPNAME
)) {
3912 clear_unexp_config_line(c2
->lxc_conf
, "lxc.utsname", false);
3913 clear_unexp_config_line(c2
->lxc_conf
, "lxc.uts.name", false);
3915 if (!do_set_config_item_locked(c2
, "lxc.uts.name", newname
)) {
3916 ERROR("Error setting new hostname");
3922 ret
= copyhooks(c
, c2
);
3924 ERROR("error copying hooks");
3928 if (copy_fstab(c
, c2
) < 0) {
3929 ERROR("error copying fstab");
3933 /* update macaddrs */
3934 if (!(flags
& LXC_CLONE_KEEPMACADDR
)) {
3935 if (!network_new_hwaddrs(c2
->lxc_conf
)) {
3936 ERROR("Error updating mac addresses");
3941 /* Update absolute paths for overlay mount directories. */
3942 if (ovl_update_abs_paths(c2
->lxc_conf
, c
->config_path
, c
->name
, lxcpath
, newname
) < 0)
3945 /* We've now successfully created c2's storage, so clear it out if we
3950 if (!c2
->save_config(c2
, NULL
))
3953 if ((pid
= fork()) < 0) {
3959 ret
= wait_for_pid(pid
);
3963 container_mem_unlock(c
);
3970 data
.hookargs
= hookargs
;
3972 if (am_guest_unpriv())
3973 ret
= userns_exec_full(c
->lxc_conf
, clone_update_rootfs_wrapper
,
3974 &data
, "clone_update_rootfs_wrapper");
3976 ret
= clone_update_rootfs(&data
);
3978 _exit(EXIT_FAILURE
);
3980 container_mem_unlock(c
);
3981 _exit(EXIT_SUCCESS
);
3984 container_mem_unlock(c
);
3986 if (!storage_copied
)
3987 c2
->lxc_conf
->rootfs
.path
= NULL
;
3990 lxc_container_put(c2
);
3996 static struct lxc_container
*lxcapi_clone(struct lxc_container
*c
, const char *newname
,
3997 const char *lxcpath
, int flags
,
3998 const char *bdevtype
, const char *bdevdata
, uint64_t newsize
,
4001 struct lxc_container
* ret
;
4003 current_config
= c
? c
->lxc_conf
: NULL
;
4004 ret
= do_lxcapi_clone(c
, newname
, lxcpath
, flags
, bdevtype
, bdevdata
, newsize
, hookargs
);
4005 current_config
= NULL
;
4010 static bool do_lxcapi_rename(struct lxc_container
*c
, const char *newname
)
4012 struct lxc_storage
*bdev
;
4013 struct lxc_container
*newc
;
4015 if (!c
|| !c
->name
|| !c
->config_path
|| !c
->lxc_conf
)
4018 if (has_fs_snapshots(c
) || has_snapshots(c
)) {
4019 ERROR("Renaming a container with snapshots is not supported");
4023 bdev
= storage_init(c
->lxc_conf
);
4025 ERROR("Failed to find original backing store type");
4029 newc
= lxcapi_clone(c
, newname
, c
->config_path
, LXC_CLONE_KEEPMACADDR
, NULL
, bdev
->type
, 0, NULL
);
4032 lxc_container_put(newc
);
4036 if (newc
&& lxcapi_is_defined(newc
))
4037 lxc_container_put(newc
);
4039 if (!container_destroy(c
, NULL
)) {
4040 ERROR("Could not destroy existing container %s", c
->name
);
4047 WRAP_API_1(bool, lxcapi_rename
, const char *)
4049 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
)
4056 current_config
= c
->lxc_conf
;
4058 ret
= lxc_attach(c
->name
, c
->config_path
, exec_function
, exec_payload
, options
, attached_process
);
4059 current_config
= NULL
;
4063 static int do_lxcapi_attach_run_wait(struct lxc_container
*c
, lxc_attach_options_t
*options
, const char *program
, const char * const argv
[])
4065 lxc_attach_command_t command
;
4072 command
.program
= (char*)program
;
4073 command
.argv
= (char**)argv
;
4075 r
= lxc_attach(c
->name
, c
->config_path
, lxc_attach_run_command
, &command
, options
, &pid
);
4081 return lxc_wait_for_pid_status(pid
);
4084 static int lxcapi_attach_run_wait(struct lxc_container
*c
, lxc_attach_options_t
*options
, const char *program
, const char * const argv
[])
4088 current_config
= c
? c
->lxc_conf
: NULL
;
4089 ret
= do_lxcapi_attach_run_wait(c
, options
, program
, argv
);
4090 current_config
= NULL
;
4095 static int get_next_index(const char *lxcpath
, char *cname
)
4097 __do_free
char *fname
;
4101 fname
= must_realloc(NULL
, strlen(lxcpath
) + 20);
4104 sprintf(fname
, "%s/snap%d", lxcpath
, i
);
4106 ret
= stat(fname
, &sb
);
4114 static bool get_snappath_dir(struct lxc_container
*c
, char *snappath
)
4119 * If the old style snapshot path exists, use it
4120 * /var/lib/lxc -> /var/lib/lxcsnaps
4122 ret
= snprintf(snappath
, PATH_MAX
, "%ssnaps", c
->config_path
);
4123 if (ret
< 0 || ret
>= PATH_MAX
)
4126 if (dir_exists(snappath
)) {
4127 ret
= snprintf(snappath
, PATH_MAX
, "%ssnaps/%s", c
->config_path
, c
->name
);
4128 if (ret
< 0 || ret
>= PATH_MAX
)
4135 * Use the new style path
4136 * /var/lib/lxc -> /var/lib/lxc + c->name + /snaps + \0
4138 ret
= snprintf(snappath
, PATH_MAX
, "%s/%s/snaps", c
->config_path
, c
->name
);
4139 if (ret
< 0 || ret
>= PATH_MAX
)
4145 static int do_lxcapi_snapshot(struct lxc_container
*c
, const char *commentfile
)
4147 __do_free
char *dfnam
= NULL
;
4151 struct lxc_container
*c2
;
4152 char snappath
[PATH_MAX
], newname
[20];
4156 if (!c
|| !lxcapi_is_defined(c
))
4159 if (!storage_can_backup(c
->lxc_conf
)) {
4160 ERROR("%s's backing store cannot be backed up", c
->name
);
4161 ERROR("Your container must use another backing store type");
4165 if (!get_snappath_dir(c
, snappath
))
4168 i
= get_next_index(snappath
, c
->name
);
4170 if (mkdir_p(snappath
, 0755) < 0) {
4171 ERROR("Failed to create snapshot directory %s", snappath
);
4175 ret
= snprintf(newname
, 20, "snap%d", i
);
4176 if (ret
< 0 || ret
>= 20)
4180 * We pass LXC_CLONE_SNAPSHOT to make sure that a rdepends file entry is
4181 * created in the original container
4183 flags
= LXC_CLONE_SNAPSHOT
| LXC_CLONE_KEEPMACADDR
| LXC_CLONE_KEEPNAME
|
4184 LXC_CLONE_KEEPBDEVTYPE
| LXC_CLONE_MAYBE_SNAPSHOT
;
4185 if (storage_is_dir(c
->lxc_conf
)) {
4186 ERROR("Snapshot of directory-backed container requested");
4187 ERROR("Making a copy-clone. If you do want snapshots, then");
4188 ERROR("please create overlay clone first, snapshot that");
4189 ERROR("and keep the original container pristine");
4190 flags
&= ~LXC_CLONE_SNAPSHOT
| LXC_CLONE_MAYBE_SNAPSHOT
;
4193 c2
= do_lxcapi_clone(c
, newname
, snappath
, flags
, NULL
, NULL
, 0, NULL
);
4195 ERROR("Failed to clone of %s:%s", c
->config_path
, c
->name
);
4199 lxc_container_put(c2
);
4201 /* Now write down the creation time. */
4204 if (!localtime_r(&timer
, &tm_info
)) {
4205 ERROR("Failed to get localtime");
4209 strftime(buffer
, 25, "%Y:%m:%d %H:%M:%S", &tm_info
);
4211 dfnam
= must_realloc(NULL
, strlen(snappath
) + strlen(newname
) + 5);
4212 sprintf(dfnam
, "%s/%s/ts", snappath
, newname
);
4213 f
= fopen(dfnam
, "w");
4215 ERROR("Failed to open %s", dfnam
);
4219 if (fprintf(f
, "%s", buffer
) < 0) {
4220 SYSERROR("Writing timestamp");
4227 SYSERROR("Writing timestamp");
4232 __do_free
char *path
;
4233 /* $p / $name / comment \0 */
4234 int len
= strlen(snappath
) + strlen(newname
) + 10;
4236 path
= must_realloc(NULL
, len
);
4237 sprintf(path
, "%s/%s/comment", snappath
, newname
);
4238 return copy_file(commentfile
, path
) < 0 ? -1 : i
;
4244 WRAP_API_1(int, lxcapi_snapshot
, const char *)
4246 static void lxcsnap_free(struct lxc_snapshot
*s
)
4249 free(s
->comment_pathname
);
4254 static char *get_snapcomment_path(char* snappath
, char *name
)
4256 /* $snappath/$name/comment */
4257 int ret
, len
= strlen(snappath
) + strlen(name
) + 10;
4258 char *s
= malloc(len
);
4261 ret
= snprintf(s
, len
, "%s/%s/comment", snappath
, name
);
4262 if (ret
< 0 || ret
>= len
) {
4271 static char *get_timestamp(char* snappath
, char *name
)
4273 char path
[PATH_MAX
], *s
= NULL
;
4277 ret
= snprintf(path
, PATH_MAX
, "%s/%s/ts", snappath
, name
);
4278 if (ret
< 0 || ret
>= PATH_MAX
)
4281 fin
= fopen(path
, "r");
4285 (void) fseek(fin
, 0, SEEK_END
);
4287 (void) fseek(fin
, 0, SEEK_SET
);
4292 if (fread(s
, 1, len
, fin
) != len
) {
4293 SYSERROR("reading timestamp");
4304 static int do_lxcapi_snapshot_list(struct lxc_container
*c
, struct lxc_snapshot
**ret_snaps
)
4306 char snappath
[PATH_MAX
], path2
[PATH_MAX
];
4308 struct dirent
*direntp
;
4309 struct lxc_snapshot
*snaps
=NULL
, *nsnaps
;
4312 if (!c
|| !lxcapi_is_defined(c
))
4315 if (!get_snappath_dir(c
, snappath
)) {
4316 ERROR("path name too long");
4320 dir
= opendir(snappath
);
4322 INFO("Failed to open %s - assuming no snapshots", snappath
);
4326 while ((direntp
= readdir(dir
))) {
4327 if (!strcmp(direntp
->d_name
, "."))
4330 if (!strcmp(direntp
->d_name
, ".."))
4333 ret
= snprintf(path2
, PATH_MAX
, "%s/%s/config", snappath
, direntp
->d_name
);
4334 if (ret
< 0 || ret
>= PATH_MAX
) {
4335 ERROR("pathname too long");
4339 if (!file_exists(path2
))
4342 nsnaps
= realloc(snaps
, (count
+ 1)*sizeof(*snaps
));
4344 SYSERROR("Out of memory");
4349 snaps
[count
].free
= lxcsnap_free
;
4350 snaps
[count
].name
= strdup(direntp
->d_name
);
4351 if (!snaps
[count
].name
)
4354 snaps
[count
].lxcpath
= strdup(snappath
);
4355 if (!snaps
[count
].lxcpath
) {
4356 free(snaps
[count
].name
);
4360 snaps
[count
].comment_pathname
= get_snapcomment_path(snappath
, direntp
->d_name
);
4361 snaps
[count
].timestamp
= get_timestamp(snappath
, direntp
->d_name
);
4366 WARN("Failed to close directory");
4375 for (i
=0; i
<count
; i
++)
4376 lxcsnap_free(&snaps
[i
]);
4382 WARN("Failed to close directory");
4387 WRAP_API_1(int, lxcapi_snapshot_list
, struct lxc_snapshot
**)
4389 static bool do_lxcapi_snapshot_restore(struct lxc_container
*c
, const char *snapname
, const char *newname
)
4391 char clonelxcpath
[PATH_MAX
];
4393 struct lxc_container
*snap
, *rest
;
4394 struct lxc_storage
*bdev
;
4397 if (!c
|| !c
->name
|| !c
->config_path
)
4400 if (has_fs_snapshots(c
)) {
4401 ERROR("container rootfs has dependent snapshots");
4405 bdev
= storage_init(c
->lxc_conf
);
4407 ERROR("Failed to find original backing store type");
4411 /* For an overlay container the rootfs is considered immutable
4412 * and cannot be removed when restoring from a snapshot. We pass this
4413 * internal flag along to communicate this to various parts of the
4416 if (!strcmp(bdev
->type
, "overlay") || !strcmp(bdev
->type
, "overlayfs"))
4417 bdev
->flags
|= LXC_STORAGE_INTERNAL_OVERLAY_RESTORE
;
4422 if (!get_snappath_dir(c
, clonelxcpath
)) {
4426 /* how should we lock this? */
4428 snap
= lxc_container_new(snapname
, clonelxcpath
);
4429 if (!snap
|| !lxcapi_is_defined(snap
)) {
4430 ERROR("Could not open snapshot %s", snapname
);
4433 lxc_container_put(snap
);
4439 if (!strcmp(c
->name
, newname
)) {
4440 if (!container_destroy(c
, bdev
)) {
4441 ERROR("Could not destroy existing container %s", newname
);
4442 lxc_container_put(snap
);
4448 if (strcmp(bdev
->type
, "dir") != 0 && strcmp(bdev
->type
, "loop") != 0)
4449 flags
= LXC_CLONE_SNAPSHOT
| LXC_CLONE_MAYBE_SNAPSHOT
;
4451 if (!strcmp(bdev
->type
, "overlay") || !strcmp(bdev
->type
, "overlayfs"))
4452 flags
|= LXC_STORAGE_INTERNAL_OVERLAY_RESTORE
;
4454 rest
= lxcapi_clone(snap
, newname
, c
->config_path
, flags
, bdev
->type
,
4457 if (rest
&& lxcapi_is_defined(rest
))
4461 lxc_container_put(rest
);
4463 lxc_container_put(snap
);
4467 WRAP_API_2(bool, lxcapi_snapshot_restore
, const char *, const char *)
4469 static bool do_snapshot_destroy(const char *snapname
, const char *clonelxcpath
)
4471 struct lxc_container
*snap
= NULL
;
4474 snap
= lxc_container_new(snapname
, clonelxcpath
);
4476 ERROR("Could not find snapshot %s", snapname
);
4480 if (!do_lxcapi_destroy(snap
)) {
4481 ERROR("Could not destroy snapshot %s", snapname
);
4489 lxc_container_put(snap
);
4494 static bool remove_all_snapshots(const char *path
)
4497 struct dirent
*direntp
;
4500 dir
= opendir(path
);
4502 SYSERROR("opendir on snapshot path %s", path
);
4506 while ((direntp
= readdir(dir
))) {
4507 if (!strcmp(direntp
->d_name
, "."))
4510 if (!strcmp(direntp
->d_name
, ".."))
4513 if (!do_snapshot_destroy(direntp
->d_name
, path
)) {
4522 SYSERROR("Error removing directory %s", path
);
4527 static bool do_lxcapi_snapshot_destroy(struct lxc_container
*c
, const char *snapname
)
4529 char clonelxcpath
[PATH_MAX
];
4531 if (!c
|| !c
->name
|| !c
->config_path
|| !snapname
)
4534 if (!get_snappath_dir(c
, clonelxcpath
))
4537 return do_snapshot_destroy(snapname
, clonelxcpath
);
4540 WRAP_API_1(bool, lxcapi_snapshot_destroy
, const char *)
4542 static bool do_lxcapi_snapshot_destroy_all(struct lxc_container
*c
)
4544 char clonelxcpath
[PATH_MAX
];
4546 if (!c
|| !c
->name
|| !c
->config_path
)
4549 if (!get_snappath_dir(c
, clonelxcpath
))
4552 return remove_all_snapshots(clonelxcpath
);
4555 WRAP_API(bool, lxcapi_snapshot_destroy_all
)
4557 static bool do_lxcapi_may_control(struct lxc_container
*c
)
4562 return lxc_try_cmd(c
->name
, c
->config_path
) == 0;
4565 WRAP_API(bool, lxcapi_may_control
)
4567 static bool do_add_remove_node(pid_t init_pid
, const char *path
, bool add
,
4573 char chrootpath
[PATH_MAX
];
4574 char *directory_path
= NULL
;
4578 SYSERROR("Failed to fork()");
4583 ret
= wait_for_pid(pid
);
4585 ERROR("Failed to create device node");
4592 /* prepare the path */
4593 ret
= snprintf(chrootpath
, PATH_MAX
, "/proc/%d/root", init_pid
);
4594 if (ret
< 0 || ret
>= PATH_MAX
)
4597 ret
= chroot(chrootpath
);
4599 _exit(EXIT_FAILURE
);
4603 _exit(EXIT_FAILURE
);
4605 /* remove path if it exists */
4606 ret
= faccessat(AT_FDCWD
, path
, F_OK
, AT_SYMLINK_NOFOLLOW
);
4610 SYSERROR("Failed to remove \"%s\"", path
);
4611 _exit(EXIT_FAILURE
);
4616 _exit(EXIT_SUCCESS
);
4618 /* create any missing directories */
4621 _exit(EXIT_FAILURE
);
4623 directory_path
= dirname(tmp
);
4624 ret
= mkdir_p(directory_path
, 0755);
4625 if (ret
< 0 && errno
!= EEXIST
) {
4626 SYSERROR("Failed to create path \"%s\"", directory_path
);
4628 _exit(EXIT_FAILURE
);
4631 /* create the device node */
4632 ret
= mknod(path
, st
->st_mode
, st
->st_rdev
);
4635 SYSERROR("Failed to create device node at \"%s\"", path
);
4636 _exit(EXIT_FAILURE
);
4639 _exit(EXIT_SUCCESS
);
4642 static bool add_remove_device_node(struct lxc_container
*c
, const char *src_path
, const char *dest_path
, bool add
)
4646 char value
[LXC_MAX_BUFFER
];
4649 /* make sure container is running */
4650 if (!do_lxcapi_is_running(c
)) {
4651 ERROR("container is not running");
4655 /* use src_path if dest_path is NULL otherwise use dest_path */
4656 p
= dest_path
? dest_path
: src_path
;
4658 /* make sure we can access p */
4659 if(access(p
, F_OK
) < 0 || stat(p
, &st
) < 0)
4662 /* continue if path is character device or block device */
4663 if (S_ISCHR(st
.st_mode
))
4664 ret
= snprintf(value
, LXC_MAX_BUFFER
, "c %d:%d rwm", major(st
.st_rdev
), minor(st
.st_rdev
));
4665 else if (S_ISBLK(st
.st_mode
))
4666 ret
= snprintf(value
, LXC_MAX_BUFFER
, "b %d:%d rwm", major(st
.st_rdev
), minor(st
.st_rdev
));
4670 /* check snprintf return code */
4671 if (ret
< 0 || ret
>= LXC_MAX_BUFFER
)
4674 if (!do_add_remove_node(do_lxcapi_init_pid(c
), p
, add
, &st
))
4677 /* add or remove device to/from cgroup access list */
4679 if (!do_lxcapi_set_cgroup_item(c
, "devices.allow", value
)) {
4680 ERROR("set_cgroup_item failed while adding the device node");
4684 if (!do_lxcapi_set_cgroup_item(c
, "devices.deny", value
)) {
4685 ERROR("set_cgroup_item failed while removing the device node");
4693 static bool do_lxcapi_add_device_node(struct lxc_container
*c
, const char *src_path
, const char *dest_path
)
4695 // cannot mknod if we're not privileged wrt init_user_ns
4696 if (am_host_unpriv()) {
4697 ERROR(LXC_UNPRIV_EOPNOTSUPP
, __FUNCTION__
);
4701 return add_remove_device_node(c
, src_path
, dest_path
, true);
4704 WRAP_API_2(bool, lxcapi_add_device_node
, const char *, const char *)
4706 static bool do_lxcapi_remove_device_node(struct lxc_container
*c
, const char *src_path
, const char *dest_path
)
4708 if (am_guest_unpriv()) {
4709 ERROR(LXC_UNPRIV_EOPNOTSUPP
, __FUNCTION__
);
4713 return add_remove_device_node(c
, src_path
, dest_path
, false);
4716 WRAP_API_2(bool, lxcapi_remove_device_node
, const char *, const char *)
4718 static bool do_lxcapi_attach_interface(struct lxc_container
*c
,
4720 const char *dst_ifname
)
4725 if (am_guest_unpriv()) {
4726 ERROR(LXC_UNPRIV_EOPNOTSUPP
, __FUNCTION__
);
4731 ERROR("No source interface name given");
4735 ret
= lxc_netdev_isup(ifname
);
4737 /* netdev of ifname is up. */
4738 ret
= lxc_netdev_down(ifname
);
4743 init_pid
= do_lxcapi_init_pid(c
);
4744 ret
= lxc_netdev_move_by_name(ifname
, init_pid
, dst_ifname
);
4748 INFO("Moved network device \"%s\" to network namespace of %d", ifname
, init_pid
);
4755 WRAP_API_2(bool, lxcapi_attach_interface
, const char *, const char *)
4757 static bool do_lxcapi_detach_interface(struct lxc_container
*c
,
4759 const char *dst_ifname
)
4762 pid_t pid
, pid_outside
;
4765 * TODO - if this is a physical device, then we need am_host_unpriv.
4766 * But for other types guest privilege suffices.
4768 if (am_guest_unpriv()) {
4769 ERROR(LXC_UNPRIV_EOPNOTSUPP
, __FUNCTION__
);
4774 ERROR("No source interface name given");
4778 pid_outside
= lxc_raw_getpid();
4781 ERROR("Failed to fork");
4785 if (pid
== 0) { /* child */
4788 init_pid
= do_lxcapi_init_pid(c
);
4789 if (!switch_to_ns(init_pid
, "net")) {
4790 ERROR("Failed to enter network namespace");
4791 _exit(EXIT_FAILURE
);
4794 ret
= lxc_netdev_isup(ifname
);
4796 ERROR("Failed to determine whether network device \"%s\" is up", ifname
);
4797 _exit(EXIT_FAILURE
);
4800 /* netdev of ifname is up. */
4802 ret
= lxc_netdev_down(ifname
);
4804 ERROR("Failed to set network device \"%s\" down", ifname
);
4805 _exit(EXIT_FAILURE
);
4809 ret
= lxc_netdev_move_by_name(ifname
, pid_outside
, dst_ifname
);
4810 /* -EINVAL means there is no netdev named as ifname. */
4813 ERROR("Network device \"%s\" not found", ifname
);
4815 ERROR("Failed to remove network device \"%s\"", ifname
);
4817 _exit(EXIT_FAILURE
);
4820 _exit(EXIT_SUCCESS
);
4823 ret
= wait_for_pid(pid
);
4827 INFO("Moved network device \"%s\" to network namespace of %d", ifname
, pid_outside
);
4831 WRAP_API_2(bool, lxcapi_detach_interface
, const char *, const char *)
4833 static int do_lxcapi_migrate(struct lxc_container
*c
, unsigned int cmd
,
4834 struct migrate_opts
*opts
, unsigned int size
)
4837 struct migrate_opts
*valid_opts
= opts
;
4838 uint64_t features_to_check
= 0;
4840 /* If the caller has a bigger (newer) struct migrate_opts, let's make
4841 * sure that the stuff on the end is zero, i.e. that they didn't ask us
4842 * to do anything special.
4844 if (size
> sizeof(*opts
)) {
4845 unsigned char *addr
;
4848 addr
= (void *)opts
+ sizeof(*opts
);
4849 end
= (void *)opts
+ size
;
4851 for (; addr
< end
; addr
++)
4856 /* If the caller has a smaller struct, let's zero out the end for them
4857 * so we don't accidentally use bits of it that they didn't know about
4860 if (size
< sizeof(*opts
)) {
4861 valid_opts
= malloc(sizeof(*opts
));
4865 memset(valid_opts
, 0, sizeof(*opts
));
4866 memcpy(valid_opts
, opts
, size
);
4870 case MIGRATE_PRE_DUMP
:
4871 if (!do_lxcapi_is_running(c
)) {
4872 ERROR("container is not running");
4876 ret
= !__criu_pre_dump(c
, valid_opts
);
4879 if (!do_lxcapi_is_running(c
)) {
4880 ERROR("container is not running");
4884 ret
= !__criu_dump(c
, valid_opts
);
4886 case MIGRATE_RESTORE
:
4887 if (do_lxcapi_is_running(c
)) {
4888 ERROR("container is already running");
4892 ret
= !__criu_restore(c
, valid_opts
);
4894 case MIGRATE_FEATURE_CHECK
:
4895 features_to_check
= valid_opts
->features_to_check
;
4896 ret
= !__criu_check_feature(&features_to_check
);
4898 /* Something went wrong. Let's let the caller
4899 * know which feature checks failed. */
4900 valid_opts
->features_to_check
= features_to_check
;
4904 ERROR("invalid migrate command %u", cmd
);
4909 if (size
< sizeof(*opts
))
4915 WRAP_API_3(int, lxcapi_migrate
, unsigned int, struct migrate_opts
*, unsigned int)
4917 static bool do_lxcapi_checkpoint(struct lxc_container
*c
, char *directory
, bool stop
, bool verbose
)
4919 struct migrate_opts opts
;
4921 memset(&opts
, 0, sizeof(opts
));
4923 opts
.directory
= directory
;
4925 opts
.verbose
= verbose
;
4927 return !do_lxcapi_migrate(c
, MIGRATE_DUMP
, &opts
, sizeof(opts
));
4930 WRAP_API_3(bool, lxcapi_checkpoint
, char *, bool, bool)
4932 static bool do_lxcapi_restore(struct lxc_container
*c
, char *directory
, bool verbose
)
4934 struct migrate_opts opts
;
4936 memset(&opts
, 0, sizeof(opts
));
4938 opts
.directory
= directory
;
4939 opts
.verbose
= verbose
;
4941 return !do_lxcapi_migrate(c
, MIGRATE_RESTORE
, &opts
, sizeof(opts
));
4944 WRAP_API_2(bool, lxcapi_restore
, char *, bool)
4946 /* @st_mode is the st_mode field of the stat(source) return struct */
4947 static int create_mount_target(const char *dest
, mode_t st_mode
)
4949 char *dirdup
, *destdirname
;
4952 dirdup
= strdup(dest
);
4954 SYSERROR("Failed to duplicate target name \"%s\"", dest
);
4957 destdirname
= dirname(dirdup
);
4959 ret
= mkdir_p(destdirname
, 0755);
4961 SYSERROR("Failed to create \"%s\"", destdirname
);
4969 if (S_ISDIR(st_mode
))
4970 ret
= mkdir(dest
, 0000);
4972 ret
= mknod(dest
, S_IFREG
| 0000, 0);
4974 SYSERROR("Failed to create mount target \"%s\"", dest
);
4981 static int do_lxcapi_mount(struct lxc_container
*c
, const char *source
,
4982 const char *target
, const char *filesystemtype
,
4983 unsigned long mountflags
, const void *data
,
4984 struct lxc_mount
*mnt
)
4987 char template[PATH_MAX
], path
[PATH_MAX
];
4988 pid_t pid
, init_pid
;
4991 int ret
= -1, fd
= -EBADF
;
4993 if (!c
|| !c
->lxc_conf
) {
4994 ERROR("Container or configuration is NULL");
4998 if (!c
->lxc_conf
->shmount
.path_host
) {
4999 ERROR("Host path to shared mountpoint must be specified in the config\n");
5003 ret
= snprintf(template, sizeof(template), "%s/.lxcmount_XXXXXX", c
->lxc_conf
->shmount
.path_host
);
5004 if (ret
< 0 || (size_t)ret
>= sizeof(template)) {
5005 SYSERROR("Error writing shmounts tempdir name");
5009 /* Create a temporary file / dir under the shared mountpoint */
5010 if (!source
|| strcmp(source
, "") == 0) {
5011 /* If source is not specified, maybe we want to mount a filesystem? */
5012 sb
.st_mode
= S_IFDIR
;
5014 ret
= stat(source
, &sb
);
5016 SYSERROR("Error getting stat info about the source \"%s\"", source
);
5021 is_dir
= (S_ISDIR(sb
.st_mode
) != 0);
5023 sret
= mkdtemp(template);
5025 SYSERROR("Could not create shmounts temporary dir");
5029 fd
= lxc_make_tmpfile(template, false);
5031 SYSERROR("Could not create shmounts temporary file");
5039 SYSERROR("Could not fork");
5045 ret
= mount(source
, template, filesystemtype
, mountflags
, data
);
5047 SYSERROR("Failed to mount onto \"%s\"", template);
5048 _exit(EXIT_FAILURE
);
5050 TRACE("Mounted \"%s\" onto \"%s\"", source
, template);
5052 init_pid
= do_lxcapi_init_pid(c
);
5054 ERROR("Failed to obtain container's init pid");
5055 _exit(EXIT_FAILURE
);
5058 /* Enter the container namespaces */
5059 if (!lxc_list_empty(&c
->lxc_conf
->id_map
)) {
5060 if (!switch_to_ns(init_pid
, "user")) {
5061 ERROR("Failed to enter user namespace");
5062 _exit(EXIT_FAILURE
);
5065 if (!lxc_switch_uid_gid(0, 0))
5066 _exit(EXIT_FAILURE
);
5069 if (!switch_to_ns(init_pid
, "mnt")) {
5070 ERROR("Failed to enter mount namespace");
5071 _exit(EXIT_FAILURE
);
5074 ret
= create_mount_target(target
, sb
.st_mode
);
5076 _exit(EXIT_FAILURE
);
5077 TRACE("Created mount target \"%s\"", target
);
5079 suff
= strrchr(template, '/');
5081 _exit(EXIT_FAILURE
);
5083 ret
= snprintf(path
, sizeof(path
), "%s%s", c
->lxc_conf
->shmount
.path_cont
, suff
);
5084 if (ret
< 0 || (size_t)ret
>= sizeof(path
)) {
5085 SYSERROR("Error writing container mountpoint name");
5086 _exit(EXIT_FAILURE
);
5089 ret
= mount(path
, target
, NULL
, MS_MOVE
| MS_REC
, NULL
);
5091 SYSERROR("Failed to move the mount from \"%s\" to \"%s\"", path
, target
);
5092 _exit(EXIT_FAILURE
);
5094 TRACE("Moved mount from \"%s\" to \"%s\"", path
, target
);
5096 _exit(EXIT_SUCCESS
);
5099 ret
= wait_for_pid(pid
);
5101 SYSERROR("Wait for the child with pid %ld failed", (long) pid
);
5107 (void)umount2(template, MNT_DETACH
);
5109 (void)rmdir(template);
5111 (void)unlink(template);
5120 WRAP_API_6(int, lxcapi_mount
, const char *, const char *, const char *,
5121 unsigned long, const void *, struct lxc_mount
*)
5123 static int do_lxcapi_umount(struct lxc_container
*c
, const char *target
,
5124 unsigned long flags
, struct lxc_mount
*mnt
)
5126 pid_t pid
, init_pid
;
5129 if (!c
|| !c
->lxc_conf
) {
5130 ERROR("Container or configuration is NULL");
5137 SYSERROR("Could not fork");
5142 init_pid
= do_lxcapi_init_pid(c
);
5144 ERROR("Failed to obtain container's init pid");
5145 _exit(EXIT_FAILURE
);
5148 /* Enter the container namespaces */
5149 if (!lxc_list_empty(&c
->lxc_conf
->id_map
)) {
5150 if (!switch_to_ns(init_pid
, "user")) {
5151 ERROR("Failed to enter user namespace");
5152 _exit(EXIT_FAILURE
);
5156 if (!switch_to_ns(init_pid
, "mnt")) {
5157 ERROR("Failed to enter mount namespace");
5158 _exit(EXIT_FAILURE
);
5161 /* Do the unmount */
5162 ret
= umount2(target
, flags
);
5164 SYSERROR("Failed to umount \"%s\"", target
);
5165 _exit(EXIT_FAILURE
);
5168 _exit(EXIT_SUCCESS
);
5171 ret
= wait_for_pid(pid
);
5173 SYSERROR("Wait for the child with pid %ld failed", (long)pid
);
5180 WRAP_API_3(int, lxcapi_umount
, const char *, unsigned long, struct lxc_mount
*)
5182 static int lxcapi_attach_run_waitl(struct lxc_container
*c
, lxc_attach_options_t
*options
, const char *program
, const char *arg
, ...)
5191 current_config
= c
->lxc_conf
;
5194 argv
= lxc_va_arg_list_to_argv_const(ap
, 1);
5198 ERROR("Memory allocation error.");
5204 ret
= do_lxcapi_attach_run_wait(c
, options
, program
, (const char * const *)argv
);
5208 current_config
= NULL
;
5212 struct lxc_container
*lxc_container_new(const char *name
, const char *configpath
)
5214 struct lxc_container
*c
;
5220 c
= malloc(sizeof(*c
));
5222 fprintf(stderr
, "Failed to allocate memory for %s\n", name
);
5225 memset(c
, 0, sizeof(*c
));
5228 c
->config_path
= strdup(configpath
);
5230 c
->config_path
= strdup(lxc_global_config_value("lxc.lxcpath"));
5231 if (!c
->config_path
) {
5232 fprintf(stderr
, "Failed to allocate memory for %s\n", name
);
5236 remove_trailing_slashes(c
->config_path
);
5239 c
->name
= malloc(len
+ 1);
5241 fprintf(stderr
, "Failed to allocate memory for %s\n", name
);
5244 (void)strlcpy(c
->name
, name
, len
+ 1);
5247 c
->slock
= lxc_newlock(c
->config_path
, name
);
5249 fprintf(stderr
, "Failed to create lock for %s\n", name
);
5253 c
->privlock
= lxc_newlock(NULL
, NULL
);
5255 fprintf(stderr
, "Failed to create private lock for %s\n", name
);
5259 if (!set_config_filename(c
)) {
5260 fprintf(stderr
, "Failed to create config file name for %s\n", name
);
5264 if (file_exists(c
->configfile
) && !lxcapi_load_config(c
, NULL
)) {
5265 fprintf(stderr
, "Failed to load config for %s\n", name
);
5269 if (ongoing_create(c
) == 2) {
5270 ERROR("Failed to complete container creation for %s", c
->name
);
5271 container_destroy(c
, NULL
);
5272 lxcapi_clear_config(c
);
5275 c
->daemonize
= true;
5278 /* Assign the member functions. */
5279 c
->is_defined
= lxcapi_is_defined
;
5280 c
->state
= lxcapi_state
;
5281 c
->is_running
= lxcapi_is_running
;
5282 c
->freeze
= lxcapi_freeze
;
5283 c
->unfreeze
= lxcapi_unfreeze
;
5284 c
->console
= lxcapi_console
;
5285 c
->console_getfd
= lxcapi_console_getfd
;
5286 c
->init_pid
= lxcapi_init_pid
;
5287 c
->load_config
= lxcapi_load_config
;
5288 c
->want_daemonize
= lxcapi_want_daemonize
;
5289 c
->want_close_all_fds
= lxcapi_want_close_all_fds
;
5290 c
->start
= lxcapi_start
;
5291 c
->startl
= lxcapi_startl
;
5292 c
->stop
= lxcapi_stop
;
5293 c
->config_file_name
= lxcapi_config_file_name
;
5294 c
->wait
= lxcapi_wait
;
5295 c
->set_config_item
= lxcapi_set_config_item
;
5296 c
->destroy
= lxcapi_destroy
;
5297 c
->destroy_with_snapshots
= lxcapi_destroy_with_snapshots
;
5298 c
->rename
= lxcapi_rename
;
5299 c
->save_config
= lxcapi_save_config
;
5300 c
->get_keys
= lxcapi_get_keys
;
5301 c
->create
= lxcapi_create
;
5302 c
->createl
= lxcapi_createl
;
5303 c
->shutdown
= lxcapi_shutdown
;
5304 c
->reboot
= lxcapi_reboot
;
5305 c
->reboot2
= lxcapi_reboot2
;
5306 c
->clear_config
= lxcapi_clear_config
;
5307 c
->clear_config_item
= lxcapi_clear_config_item
;
5308 c
->get_config_item
= lxcapi_get_config_item
;
5309 c
->get_running_config_item
= lxcapi_get_running_config_item
;
5310 c
->get_cgroup_item
= lxcapi_get_cgroup_item
;
5311 c
->set_cgroup_item
= lxcapi_set_cgroup_item
;
5312 c
->get_config_path
= lxcapi_get_config_path
;
5313 c
->set_config_path
= lxcapi_set_config_path
;
5314 c
->clone
= lxcapi_clone
;
5315 c
->get_interfaces
= lxcapi_get_interfaces
;
5316 c
->get_ips
= lxcapi_get_ips
;
5317 c
->attach
= lxcapi_attach
;
5318 c
->attach_run_wait
= lxcapi_attach_run_wait
;
5319 c
->attach_run_waitl
= lxcapi_attach_run_waitl
;
5320 c
->snapshot
= lxcapi_snapshot
;
5321 c
->snapshot_list
= lxcapi_snapshot_list
;
5322 c
->snapshot_restore
= lxcapi_snapshot_restore
;
5323 c
->snapshot_destroy
= lxcapi_snapshot_destroy
;
5324 c
->snapshot_destroy_all
= lxcapi_snapshot_destroy_all
;
5325 c
->may_control
= lxcapi_may_control
;
5326 c
->add_device_node
= lxcapi_add_device_node
;
5327 c
->remove_device_node
= lxcapi_remove_device_node
;
5328 c
->attach_interface
= lxcapi_attach_interface
;
5329 c
->detach_interface
= lxcapi_detach_interface
;
5330 c
->checkpoint
= lxcapi_checkpoint
;
5331 c
->restore
= lxcapi_restore
;
5332 c
->migrate
= lxcapi_migrate
;
5333 c
->console_log
= lxcapi_console_log
;
5334 c
->mount
= lxcapi_mount
;
5335 c
->umount
= lxcapi_umount
;
5340 lxc_container_free(c
);
5344 int lxc_get_wait_states(const char **states
)
5349 for (i
=0; i
<MAX_STATE
; i
++)
5350 states
[i
] = lxc_state2str(i
);
5356 * These next two could probably be done smarter with reusing a common function
5357 * with different iterators and tests...
5359 int list_defined_containers(const char *lxcpath
, char ***names
, struct lxc_container
***cret
)
5362 int i
, cfound
= 0, nfound
= 0;
5363 struct dirent
*direntp
;
5364 struct lxc_container
*c
;
5367 lxcpath
= lxc_global_config_value("lxc.lxcpath");
5369 dir
= opendir(lxcpath
);
5371 SYSERROR("opendir on lxcpath");
5381 while ((direntp
= readdir(dir
))) {
5382 /* Ignore '.', '..' and any hidden directory. */
5383 if (!strncmp(direntp
->d_name
, ".", 1))
5386 if (!config_file_exists(lxcpath
, direntp
->d_name
))
5390 if (!add_to_array(names
, direntp
->d_name
, cfound
))
5400 c
= lxc_container_new(direntp
->d_name
, lxcpath
);
5402 INFO("Container %s:%s has a config but could not be loaded",
5403 lxcpath
, direntp
->d_name
);
5406 if(!remove_from_array(names
, direntp
->d_name
, cfound
--))
5412 if (!do_lxcapi_is_defined(c
)) {
5413 INFO("Container %s:%s has a config but is not defined",
5414 lxcpath
, direntp
->d_name
);
5417 if(!remove_from_array(names
, direntp
->d_name
, cfound
--))
5420 lxc_container_put(c
);
5424 if (!add_to_clist(cret
, c
, nfound
, true)) {
5425 lxc_container_put(c
);
5436 if (names
&& *names
) {
5437 for (i
=0; i
<cfound
; i
++)
5442 if (cret
&& *cret
) {
5443 for (i
=0; i
<nfound
; i
++)
5444 lxc_container_put((*cret
)[i
]);
5452 int list_active_containers(const char *lxcpath
, char ***nret
,
5453 struct lxc_container
***cret
)
5455 int i
, ret
= -1, cret_cnt
= 0, ct_name_cnt
= 0;
5458 char **ct_name
= NULL
;
5460 struct lxc_container
*c
= NULL
;
5464 lxcpath
= lxc_global_config_value("lxc.lxcpath");
5465 lxcpath_len
= strlen(lxcpath
);
5473 FILE *f
= fopen("/proc/net/unix", "r");
5477 while (getline(&line
, &len
, f
) != -1) {
5478 char *p
= strrchr(line
, ' '), *p2
;
5489 if (strncmp(p
, lxcpath
, lxcpath_len
) == 0) {
5491 } else if (strncmp(p
, "lxc/", 4) == 0) {
5501 /* Now p is the start of lxc_name. */
5502 p2
= strchr(p
, '/');
5503 if (!p2
|| strncmp(p2
, "/command", 8) != 0)
5508 char *recvpath
= lxc_cmd_get_lxcpath(p
);
5512 if (strncmp(lxcpath
, recvpath
, lxcpath_len
) != 0) {
5518 p
= lxc_cmd_get_name(p
);
5523 if (array_contains(&ct_name
, p
, ct_name_cnt
)) {
5529 if (!add_to_array(&ct_name
, p
, ct_name_cnt
)) {
5532 goto free_cret_list
;
5543 c
= lxc_container_new(p
, lxcpath
);
5545 INFO("Container %s:%s is running but could not be loaded",
5548 remove_from_array(&ct_name
, p
, ct_name_cnt
--);
5559 * If this is an anonymous container, then is_defined *can*
5560 * return false. So we don't do that check. Count on the
5561 * fact that the command socket exists.
5564 if (!add_to_clist(cret
, c
, cret_cnt
, true)) {
5565 lxc_container_put(c
);
5566 goto free_cret_list
;
5572 if (nret
&& cret
&& cret_cnt
!= ct_name_cnt
) {
5574 lxc_container_put(c
);
5575 goto free_cret_list
;
5587 if (cret
&& *cret
) {
5588 for (i
= 0; i
< cret_cnt
; i
++)
5589 lxc_container_put((*cret
)[i
]);
5595 for (i
= 0; i
< ct_name_cnt
; i
++)
5606 int list_all_containers(const char *lxcpath
, char ***nret
,
5607 struct lxc_container
***cret
)
5609 int i
, ret
, active_cnt
, ct_cnt
, ct_list_cnt
;
5612 struct lxc_container
**ct_list
= NULL
;
5614 ct_cnt
= list_defined_containers(lxcpath
, &ct_name
, NULL
);
5618 active_cnt
= list_active_containers(lxcpath
, &active_name
, NULL
);
5619 if (active_cnt
< 0) {
5624 for (i
= 0; i
< active_cnt
; i
++) {
5625 if (!array_contains(&ct_name
, active_name
[i
], ct_cnt
)) {
5626 if (!add_to_array(&ct_name
, active_name
[i
], ct_cnt
)) {
5628 goto free_active_name
;
5634 free(active_name
[i
]);
5635 active_name
[i
] = NULL
;
5642 for (i
= 0, ct_list_cnt
= 0; i
< ct_cnt
&& cret
; i
++) {
5643 struct lxc_container
*c
;
5645 c
= lxc_container_new(ct_name
[i
], lxcpath
);
5647 WARN("Container %s:%s could not be loaded", lxcpath
, ct_name
[i
]);
5648 remove_from_array(&ct_name
, ct_name
[i
], ct_cnt
--);
5652 if (!add_to_clist(&ct_list
, c
, ct_list_cnt
, false)) {
5653 lxc_container_put(c
);
5674 for (i
= 0; i
< ct_list_cnt
; i
++) {
5675 lxc_container_put(ct_list
[i
]);
5680 for (i
= 0; i
< active_cnt
; i
++) {
5681 free(active_name
[i
]);
5686 for (i
= 0; i
< ct_cnt
; i
++) {
5693 bool lxc_config_item_is_supported(const char *key
)
5695 return !!lxc_get_config(key
);
5698 bool lxc_has_api_extension(const char *extension
)
5700 /* The NULL API extension is always present. :) */
5704 for (size_t i
= 0; i
< nr_api_extensions
; i
++)
5705 if (strcmp(api_extensions
[i
], extension
) == 0)