2 This file is part of systemd.
4 Copyright 2010 Lennart Poettering
6 systemd is free software; you can redistribute it and/or modify it
7 under the terms of the GNU Lesser General Public License as published by
8 the Free Software Foundation; either version 2.1 of the License, or
9 (at your option) any later version.
11 systemd is distributed in the hope that it will be useful, but
12 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 License
17 along with systemd; If not, see <http://www.gnu.org/licenses/>.
26 #include <linux/loop.h>
30 #include <selinux/selinux.h>
37 #include <sys/mount.h>
38 #include <sys/personality.h>
39 #include <sys/prctl.h>
40 #include <sys/types.h>
45 #include "sd-daemon.h"
48 #include "alloc-util.h"
50 #include "base-filesystem.h"
51 #include "blkid-util.h"
52 #include "btrfs-util.h"
55 #include "capability-util.h"
56 #include "cgroup-util.h"
58 #include "dev-setup.h"
59 #include "dissect-image.h"
64 #include "format-util.h"
67 #include "hexdecoct.h"
68 #include "hostname-util.h"
69 #include "id128-util.h"
71 #include "loop-util.h"
72 #include "loopback-setup.h"
73 #include "machine-image.h"
77 #include "mount-util.h"
78 #include "netlink-util.h"
79 #include "nspawn-cgroup.h"
80 #include "nspawn-expose-ports.h"
81 #include "nspawn-mount.h"
82 #include "nspawn-network.h"
83 #include "nspawn-patch-uid.h"
84 #include "nspawn-register.h"
85 #include "nspawn-seccomp.h"
86 #include "nspawn-settings.h"
87 #include "nspawn-setuid.h"
88 #include "nspawn-stub-pid1.h"
89 #include "parse-util.h"
90 #include "path-util.h"
91 #include "process-util.h"
93 #include "random-util.h"
94 #include "raw-clone.h"
96 #include "selinux-util.h"
97 #include "signal-util.h"
98 #include "socket-util.h"
99 #include "stat-util.h"
100 #include "stdio-util.h"
101 #include "string-util.h"
103 #include "terminal-util.h"
104 #include "udev-util.h"
105 #include "umask-util.h"
106 #include "user-util.h"
109 /* Note that devpts's gid= parameter parses GIDs as signed values, hence we stay away from the upper half of the 32bit
110 * UID range here. We leave a bit of room at the lower end and a lot of room at the upper end, so that other subsystems
111 * may have their own allocation ranges too. */
112 #define UID_SHIFT_PICK_MIN ((uid_t) UINT32_C(0x00080000))
113 #define UID_SHIFT_PICK_MAX ((uid_t) UINT32_C(0x6FFF0000))
115 /* nspawn is listening on the socket at the path in the constant nspawn_notify_socket_path
116 * nspawn_notify_socket_path is relative to the container
117 * the init process in the container pid can send messages to nspawn following the sd_notify(3) protocol */
118 #define NSPAWN_NOTIFY_SOCKET_PATH "/run/systemd/nspawn/notify"
120 #define EXIT_FORCE_RESTART 133
122 typedef enum ContainerStatus
{
123 CONTAINER_TERMINATED
,
127 typedef enum LinkJournal
{
134 static char *arg_directory
= NULL
;
135 static char *arg_template
= NULL
;
136 static char *arg_chdir
= NULL
;
137 static char *arg_pivot_root_new
= NULL
;
138 static char *arg_pivot_root_old
= NULL
;
139 static char *arg_user
= NULL
;
140 static sd_id128_t arg_uuid
= {};
141 static char *arg_machine
= NULL
;
142 static const char *arg_selinux_context
= NULL
;
143 static const char *arg_selinux_apifs_context
= NULL
;
144 static const char *arg_slice
= NULL
;
145 static bool arg_private_network
= false;
146 static bool arg_read_only
= false;
147 static StartMode arg_start_mode
= START_PID1
;
148 static bool arg_ephemeral
= false;
149 static LinkJournal arg_link_journal
= LINK_AUTO
;
150 static bool arg_link_journal_try
= false;
151 static uint64_t arg_caps_retain
=
152 (1ULL << CAP_AUDIT_CONTROL
) |
153 (1ULL << CAP_AUDIT_WRITE
) |
154 (1ULL << CAP_CHOWN
) |
155 (1ULL << CAP_DAC_OVERRIDE
) |
156 (1ULL << CAP_DAC_READ_SEARCH
) |
157 (1ULL << CAP_FOWNER
) |
158 (1ULL << CAP_FSETID
) |
159 (1ULL << CAP_IPC_OWNER
) |
161 (1ULL << CAP_LEASE
) |
162 (1ULL << CAP_LINUX_IMMUTABLE
) |
163 (1ULL << CAP_MKNOD
) |
164 (1ULL << CAP_NET_BIND_SERVICE
) |
165 (1ULL << CAP_NET_BROADCAST
) |
166 (1ULL << CAP_NET_RAW
) |
167 (1ULL << CAP_SETFCAP
) |
168 (1ULL << CAP_SETGID
) |
169 (1ULL << CAP_SETPCAP
) |
170 (1ULL << CAP_SETUID
) |
171 (1ULL << CAP_SYS_ADMIN
) |
172 (1ULL << CAP_SYS_BOOT
) |
173 (1ULL << CAP_SYS_CHROOT
) |
174 (1ULL << CAP_SYS_NICE
) |
175 (1ULL << CAP_SYS_PTRACE
) |
176 (1ULL << CAP_SYS_RESOURCE
) |
177 (1ULL << CAP_SYS_TTY_CONFIG
);
178 static CustomMount
*arg_custom_mounts
= NULL
;
179 static unsigned arg_n_custom_mounts
= 0;
180 static char **arg_setenv
= NULL
;
181 static bool arg_quiet
= false;
182 static bool arg_register
= true;
183 static bool arg_keep_unit
= false;
184 static char **arg_network_interfaces
= NULL
;
185 static char **arg_network_macvlan
= NULL
;
186 static char **arg_network_ipvlan
= NULL
;
187 static bool arg_network_veth
= false;
188 static char **arg_network_veth_extra
= NULL
;
189 static char *arg_network_bridge
= NULL
;
190 static char *arg_network_zone
= NULL
;
191 static unsigned long arg_personality
= PERSONALITY_INVALID
;
192 static char *arg_image
= NULL
;
193 static VolatileMode arg_volatile_mode
= VOLATILE_NO
;
194 static ExposePort
*arg_expose_ports
= NULL
;
195 static char **arg_property
= NULL
;
196 static UserNamespaceMode arg_userns_mode
= USER_NAMESPACE_NO
;
197 static uid_t arg_uid_shift
= UID_INVALID
, arg_uid_range
= 0x10000U
;
198 static bool arg_userns_chown
= false;
199 static int arg_kill_signal
= 0;
200 static CGroupUnified arg_unified_cgroup_hierarchy
= CGROUP_UNIFIED_UNKNOWN
;
201 static SettingsMask arg_settings_mask
= 0;
202 static int arg_settings_trusted
= -1;
203 static char **arg_parameters
= NULL
;
204 static const char *arg_container_service_name
= "systemd-nspawn";
205 static bool arg_notify_ready
= false;
206 static bool arg_use_cgns
= true;
207 static unsigned long arg_clone_ns_flags
= CLONE_NEWIPC
|CLONE_NEWPID
|CLONE_NEWUTS
;
208 static MountSettingsMask arg_mount_settings
= MOUNT_APPLY_APIVFS_RO
;
209 static void *arg_root_hash
= NULL
;
210 static size_t arg_root_hash_size
= 0;
211 static char **arg_syscall_whitelist
= NULL
;
212 static char **arg_syscall_blacklist
= NULL
;
214 static void help(void) {
215 printf("%s [OPTIONS...] [PATH] [ARGUMENTS...]\n\n"
216 "Spawn a minimal namespace container for debugging, testing and building.\n\n"
217 " -h --help Show this help\n"
218 " --version Print version string\n"
219 " -q --quiet Do not show status information\n"
220 " -D --directory=PATH Root directory for the container\n"
221 " --template=PATH Initialize root directory from template directory,\n"
223 " -x --ephemeral Run container with snapshot of root directory, and\n"
224 " remove it after exit\n"
225 " -i --image=PATH File system device or disk image for the container\n"
226 " --root-hash=HASH Specify verity root hash\n"
227 " -a --as-pid2 Maintain a stub init as PID1, invoke binary as PID2\n"
228 " -b --boot Boot up full system (i.e. invoke init)\n"
229 " --chdir=PATH Set working directory in the container\n"
230 " --pivot-root=PATH[:PATH]\n"
231 " Pivot root to given directory in the container\n"
232 " -u --user=USER Run the command under specified user or uid\n"
233 " -M --machine=NAME Set the machine name for the container\n"
234 " --uuid=UUID Set a specific machine UUID for the container\n"
235 " -S --slice=SLICE Place the container in the specified slice\n"
236 " --property=NAME=VALUE Set scope unit property\n"
237 " -U --private-users=pick Run within user namespace, autoselect UID/GID range\n"
238 " --private-users[=UIDBASE[:NUIDS]]\n"
239 " Similar, but with user configured UID/GID range\n"
240 " --private-users-chown Adjust OS tree ownership to private UID/GID range\n"
241 " --private-network Disable network in container\n"
242 " --network-interface=INTERFACE\n"
243 " Assign an existing network interface to the\n"
245 " --network-macvlan=INTERFACE\n"
246 " Create a macvlan network interface based on an\n"
247 " existing network interface to the container\n"
248 " --network-ipvlan=INTERFACE\n"
249 " Create a ipvlan network interface based on an\n"
250 " existing network interface to the container\n"
251 " -n --network-veth Add a virtual Ethernet connection between host\n"
253 " --network-veth-extra=HOSTIF[:CONTAINERIF]\n"
254 " Add an additional virtual Ethernet link between\n"
255 " host and container\n"
256 " --network-bridge=INTERFACE\n"
257 " Add a virtual Ethernet connection to the container\n"
258 " and attach it to an existing bridge on the host\n"
259 " --network-zone=NAME Similar, but attach the new interface to an\n"
260 " an automatically managed bridge interface\n"
261 " -p --port=[PROTOCOL:]HOSTPORT[:CONTAINERPORT]\n"
262 " Expose a container IP port on the host\n"
263 " -Z --selinux-context=SECLABEL\n"
264 " Set the SELinux security context to be used by\n"
265 " processes in the container\n"
266 " -L --selinux-apifs-context=SECLABEL\n"
267 " Set the SELinux security context to be used by\n"
268 " API/tmpfs file systems in the container\n"
269 " --capability=CAP In addition to the default, retain specified\n"
271 " --drop-capability=CAP Drop the specified capability from the default set\n"
272 " --system-call-filter=LIST|~LIST\n"
273 " Permit/prohibit specific system calls\n"
274 " --kill-signal=SIGNAL Select signal to use for shutting down PID 1\n"
275 " --link-journal=MODE Link up guest journal, one of no, auto, guest, \n"
276 " host, try-guest, try-host\n"
277 " -j Equivalent to --link-journal=try-guest\n"
278 " --read-only Mount the root directory read-only\n"
279 " --bind=PATH[:PATH[:OPTIONS]]\n"
280 " Bind mount a file or directory from the host into\n"
282 " --bind-ro=PATH[:PATH[:OPTIONS]\n"
283 " Similar, but creates a read-only bind mount\n"
284 " --tmpfs=PATH:[OPTIONS] Mount an empty tmpfs to the specified directory\n"
285 " --overlay=PATH[:PATH...]:PATH\n"
286 " Create an overlay mount from the host to \n"
288 " --overlay-ro=PATH[:PATH...]:PATH\n"
289 " Similar, but creates a read-only overlay mount\n"
290 " -E --setenv=NAME=VALUE Pass an environment variable to PID 1\n"
291 " --register=BOOLEAN Register container as machine\n"
292 " --keep-unit Do not register a scope for the machine, reuse\n"
293 " the service unit nspawn is running in\n"
294 " --volatile[=MODE] Run the system in volatile mode\n"
295 " --settings=BOOLEAN Load additional settings from .nspawn file\n"
296 " --notify-ready=BOOLEAN Receive notifications from the child init process\n"
297 , program_invocation_short_name
);
300 static int custom_mount_check_all(void) {
303 for (i
= 0; i
< arg_n_custom_mounts
; i
++) {
304 CustomMount
*m
= &arg_custom_mounts
[i
];
306 if (path_equal(m
->destination
, "/") && arg_userns_mode
!= USER_NAMESPACE_NO
) {
308 if (arg_userns_chown
) {
309 log_error("--private-users-chown may not be combined with custom root mounts.");
311 } else if (arg_uid_shift
== UID_INVALID
) {
312 log_error("--private-users with automatic UID shift may not be combined with custom root mounts.");
321 static int detect_unified_cgroup_hierarchy(const char *directory
) {
325 /* Allow the user to control whether the unified hierarchy is used */
326 e
= getenv("UNIFIED_CGROUP_HIERARCHY");
328 r
= parse_boolean(e
);
330 return log_error_errno(r
, "Failed to parse $UNIFIED_CGROUP_HIERARCHY.");
332 arg_unified_cgroup_hierarchy
= CGROUP_UNIFIED_ALL
;
334 arg_unified_cgroup_hierarchy
= CGROUP_UNIFIED_NONE
;
339 /* Otherwise inherit the default from the host system */
340 r
= cg_all_unified();
342 return log_error_errno(r
, "Failed to determine whether we are in all unified mode.");
344 /* Unified cgroup hierarchy support was added in 230. Unfortunately the detection
345 * routine only detects 231, so we'll have a false negative here for 230. */
346 r
= systemd_installation_has_version(directory
, 230);
348 return log_error_errno(r
, "Failed to determine systemd version in container: %m");
350 arg_unified_cgroup_hierarchy
= CGROUP_UNIFIED_ALL
;
352 arg_unified_cgroup_hierarchy
= CGROUP_UNIFIED_NONE
;
353 } else if (cg_unified_controller(SYSTEMD_CGROUP_CONTROLLER
) > 0) {
354 /* Mixed cgroup hierarchy support was added in 233 */
355 r
= systemd_installation_has_version(directory
, 233);
357 return log_error_errno(r
, "Failed to determine systemd version in container: %m");
359 arg_unified_cgroup_hierarchy
= CGROUP_UNIFIED_SYSTEMD
;
361 arg_unified_cgroup_hierarchy
= CGROUP_UNIFIED_NONE
;
363 arg_unified_cgroup_hierarchy
= CGROUP_UNIFIED_NONE
;
368 static void parse_share_ns_env(const char *name
, unsigned long ns_flag
) {
371 r
= getenv_bool(name
);
375 log_warning_errno(r
, "Failed to parse %s from environment, defaulting to false.", name
);
376 arg_clone_ns_flags
= (arg_clone_ns_flags
& ~ns_flag
) | (r
> 0 ? 0 : ns_flag
);
379 static void parse_mount_settings_env(void) {
383 e
= getenv("SYSTEMD_NSPAWN_API_VFS_WRITABLE");
387 if (streq(e
, "network")) {
388 arg_mount_settings
|= MOUNT_APPLY_APIVFS_RO
|MOUNT_APPLY_APIVFS_NETNS
;
392 r
= parse_boolean(e
);
394 log_warning_errno(r
, "Failed to parse SYSTEMD_NSPAWN_API_VFS_WRITABLE from environment, ignoring.");
398 SET_FLAG(arg_mount_settings
, MOUNT_APPLY_APIVFS_RO
, r
== 0);
399 SET_FLAG(arg_mount_settings
, MOUNT_APPLY_APIVFS_NETNS
, false);
402 static int parse_argv(int argc
, char *argv
[]) {
420 ARG_NETWORK_INTERFACE
,
425 ARG_NETWORK_VETH_EXTRA
,
435 ARG_PRIVATE_USERS_CHOWN
,
438 ARG_SYSTEM_CALL_FILTER
,
441 static const struct option options
[] = {
442 { "help", no_argument
, NULL
, 'h' },
443 { "version", no_argument
, NULL
, ARG_VERSION
},
444 { "directory", required_argument
, NULL
, 'D' },
445 { "template", required_argument
, NULL
, ARG_TEMPLATE
},
446 { "ephemeral", no_argument
, NULL
, 'x' },
447 { "user", required_argument
, NULL
, 'u' },
448 { "private-network", no_argument
, NULL
, ARG_PRIVATE_NETWORK
},
449 { "as-pid2", no_argument
, NULL
, 'a' },
450 { "boot", no_argument
, NULL
, 'b' },
451 { "uuid", required_argument
, NULL
, ARG_UUID
},
452 { "read-only", no_argument
, NULL
, ARG_READ_ONLY
},
453 { "capability", required_argument
, NULL
, ARG_CAPABILITY
},
454 { "drop-capability", required_argument
, NULL
, ARG_DROP_CAPABILITY
},
455 { "link-journal", required_argument
, NULL
, ARG_LINK_JOURNAL
},
456 { "bind", required_argument
, NULL
, ARG_BIND
},
457 { "bind-ro", required_argument
, NULL
, ARG_BIND_RO
},
458 { "tmpfs", required_argument
, NULL
, ARG_TMPFS
},
459 { "overlay", required_argument
, NULL
, ARG_OVERLAY
},
460 { "overlay-ro", required_argument
, NULL
, ARG_OVERLAY_RO
},
461 { "machine", required_argument
, NULL
, 'M' },
462 { "slice", required_argument
, NULL
, 'S' },
463 { "setenv", required_argument
, NULL
, 'E' },
464 { "selinux-context", required_argument
, NULL
, 'Z' },
465 { "selinux-apifs-context", required_argument
, NULL
, 'L' },
466 { "quiet", no_argument
, NULL
, 'q' },
467 { "share-system", no_argument
, NULL
, ARG_SHARE_SYSTEM
}, /* not documented */
468 { "register", required_argument
, NULL
, ARG_REGISTER
},
469 { "keep-unit", no_argument
, NULL
, ARG_KEEP_UNIT
},
470 { "network-interface", required_argument
, NULL
, ARG_NETWORK_INTERFACE
},
471 { "network-macvlan", required_argument
, NULL
, ARG_NETWORK_MACVLAN
},
472 { "network-ipvlan", required_argument
, NULL
, ARG_NETWORK_IPVLAN
},
473 { "network-veth", no_argument
, NULL
, 'n' },
474 { "network-veth-extra", required_argument
, NULL
, ARG_NETWORK_VETH_EXTRA
},
475 { "network-bridge", required_argument
, NULL
, ARG_NETWORK_BRIDGE
},
476 { "network-zone", required_argument
, NULL
, ARG_NETWORK_ZONE
},
477 { "personality", required_argument
, NULL
, ARG_PERSONALITY
},
478 { "image", required_argument
, NULL
, 'i' },
479 { "volatile", optional_argument
, NULL
, ARG_VOLATILE
},
480 { "port", required_argument
, NULL
, 'p' },
481 { "property", required_argument
, NULL
, ARG_PROPERTY
},
482 { "private-users", optional_argument
, NULL
, ARG_PRIVATE_USERS
},
483 { "private-users-chown", optional_argument
, NULL
, ARG_PRIVATE_USERS_CHOWN
},
484 { "kill-signal", required_argument
, NULL
, ARG_KILL_SIGNAL
},
485 { "settings", required_argument
, NULL
, ARG_SETTINGS
},
486 { "chdir", required_argument
, NULL
, ARG_CHDIR
},
487 { "pivot-root", required_argument
, NULL
, ARG_PIVOT_ROOT
},
488 { "notify-ready", required_argument
, NULL
, ARG_NOTIFY_READY
},
489 { "root-hash", required_argument
, NULL
, ARG_ROOT_HASH
},
490 { "system-call-filter", required_argument
, NULL
, ARG_SYSTEM_CALL_FILTER
},
496 uint64_t plus
= 0, minus
= 0;
497 bool mask_all_settings
= false, mask_no_settings
= false;
502 while ((c
= getopt_long(argc
, argv
, "+hD:u:abL:M:jS:Z:qi:xp:nUE:", options
, NULL
)) >= 0)
514 r
= parse_path_argument_and_warn(optarg
, false, &arg_directory
);
520 r
= parse_path_argument_and_warn(optarg
, false, &arg_template
);
526 r
= parse_path_argument_and_warn(optarg
, false, &arg_image
);
532 arg_ephemeral
= true;
536 r
= free_and_strdup(&arg_user
, optarg
);
540 arg_settings_mask
|= SETTING_USER
;
543 case ARG_NETWORK_ZONE
: {
546 j
= strappend("vz-", optarg
);
550 if (!ifname_valid(j
)) {
551 log_error("Network zone name not valid: %s", j
);
556 free(arg_network_zone
);
557 arg_network_zone
= j
;
559 arg_network_veth
= true;
560 arg_private_network
= true;
561 arg_settings_mask
|= SETTING_NETWORK
;
565 case ARG_NETWORK_BRIDGE
:
567 if (!ifname_valid(optarg
)) {
568 log_error("Bridge interface name not valid: %s", optarg
);
572 r
= free_and_strdup(&arg_network_bridge
, optarg
);
579 arg_network_veth
= true;
580 arg_private_network
= true;
581 arg_settings_mask
|= SETTING_NETWORK
;
584 case ARG_NETWORK_VETH_EXTRA
:
585 r
= veth_extra_parse(&arg_network_veth_extra
, optarg
);
587 return log_error_errno(r
, "Failed to parse --network-veth-extra= parameter: %s", optarg
);
589 arg_private_network
= true;
590 arg_settings_mask
|= SETTING_NETWORK
;
593 case ARG_NETWORK_INTERFACE
:
595 if (!ifname_valid(optarg
)) {
596 log_error("Network interface name not valid: %s", optarg
);
600 if (strv_extend(&arg_network_interfaces
, optarg
) < 0)
603 arg_private_network
= true;
604 arg_settings_mask
|= SETTING_NETWORK
;
607 case ARG_NETWORK_MACVLAN
:
609 if (!ifname_valid(optarg
)) {
610 log_error("MACVLAN network interface name not valid: %s", optarg
);
614 if (strv_extend(&arg_network_macvlan
, optarg
) < 0)
617 arg_private_network
= true;
618 arg_settings_mask
|= SETTING_NETWORK
;
621 case ARG_NETWORK_IPVLAN
:
623 if (!ifname_valid(optarg
)) {
624 log_error("IPVLAN network interface name not valid: %s", optarg
);
628 if (strv_extend(&arg_network_ipvlan
, optarg
) < 0)
633 case ARG_PRIVATE_NETWORK
:
634 arg_private_network
= true;
635 arg_settings_mask
|= SETTING_NETWORK
;
639 if (arg_start_mode
== START_PID2
) {
640 log_error("--boot and --as-pid2 may not be combined.");
644 arg_start_mode
= START_BOOT
;
645 arg_settings_mask
|= SETTING_START_MODE
;
649 if (arg_start_mode
== START_BOOT
) {
650 log_error("--boot and --as-pid2 may not be combined.");
654 arg_start_mode
= START_PID2
;
655 arg_settings_mask
|= SETTING_START_MODE
;
659 r
= sd_id128_from_string(optarg
, &arg_uuid
);
661 return log_error_errno(r
, "Invalid UUID: %s", optarg
);
663 if (sd_id128_is_null(arg_uuid
)) {
664 log_error("Machine UUID may not be all zeroes.");
668 arg_settings_mask
|= SETTING_MACHINE_ID
;
677 arg_machine
= mfree(arg_machine
);
679 if (!machine_name_is_valid(optarg
)) {
680 log_error("Invalid machine name: %s", optarg
);
684 r
= free_and_strdup(&arg_machine
, optarg
);
691 arg_selinux_context
= optarg
;
695 arg_selinux_apifs_context
= optarg
;
699 arg_read_only
= true;
700 arg_settings_mask
|= SETTING_READ_ONLY
;
704 case ARG_DROP_CAPABILITY
: {
707 _cleanup_free_
char *t
= NULL
;
709 r
= extract_first_word(&p
, &t
, ",", 0);
711 return log_error_errno(r
, "Failed to parse capability %s.", t
);
716 if (streq(t
, "all")) {
717 if (c
== ARG_CAPABILITY
)
718 plus
= (uint64_t) -1;
720 minus
= (uint64_t) -1;
724 cap
= capability_from_name(t
);
726 log_error("Failed to parse capability %s.", t
);
730 if (c
== ARG_CAPABILITY
)
731 plus
|= 1ULL << (uint64_t) cap
;
733 minus
|= 1ULL << (uint64_t) cap
;
737 arg_settings_mask
|= SETTING_CAPABILITY
;
742 arg_link_journal
= LINK_GUEST
;
743 arg_link_journal_try
= true;
746 case ARG_LINK_JOURNAL
:
747 if (streq(optarg
, "auto")) {
748 arg_link_journal
= LINK_AUTO
;
749 arg_link_journal_try
= false;
750 } else if (streq(optarg
, "no")) {
751 arg_link_journal
= LINK_NO
;
752 arg_link_journal_try
= false;
753 } else if (streq(optarg
, "guest")) {
754 arg_link_journal
= LINK_GUEST
;
755 arg_link_journal_try
= false;
756 } else if (streq(optarg
, "host")) {
757 arg_link_journal
= LINK_HOST
;
758 arg_link_journal_try
= false;
759 } else if (streq(optarg
, "try-guest")) {
760 arg_link_journal
= LINK_GUEST
;
761 arg_link_journal_try
= true;
762 } else if (streq(optarg
, "try-host")) {
763 arg_link_journal
= LINK_HOST
;
764 arg_link_journal_try
= true;
766 log_error("Failed to parse link journal mode %s", optarg
);
774 r
= bind_mount_parse(&arg_custom_mounts
, &arg_n_custom_mounts
, optarg
, c
== ARG_BIND_RO
);
776 return log_error_errno(r
, "Failed to parse --bind(-ro)= argument %s: %m", optarg
);
778 arg_settings_mask
|= SETTING_CUSTOM_MOUNTS
;
782 r
= tmpfs_mount_parse(&arg_custom_mounts
, &arg_n_custom_mounts
, optarg
);
784 return log_error_errno(r
, "Failed to parse --tmpfs= argument %s: %m", optarg
);
786 arg_settings_mask
|= SETTING_CUSTOM_MOUNTS
;
791 r
= overlay_mount_parse(&arg_custom_mounts
, &arg_n_custom_mounts
, optarg
, c
== ARG_OVERLAY_RO
);
792 if (r
== -EADDRNOTAVAIL
)
793 return log_error_errno(r
, "--overlay(-ro)= needs at least two colon-separated directories specified.");
795 return log_error_errno(r
, "Failed to parse --overlay(-ro)= argument %s: %m", optarg
);
797 arg_settings_mask
|= SETTING_CUSTOM_MOUNTS
;
803 if (!env_assignment_is_valid(optarg
)) {
804 log_error("Environment variable assignment '%s' is not valid.", optarg
);
808 n
= strv_env_set(arg_setenv
, optarg
);
812 strv_free(arg_setenv
);
815 arg_settings_mask
|= SETTING_ENVIRONMENT
;
823 case ARG_SHARE_SYSTEM
:
824 /* We don't officially support this anymore, except for compat reasons. People should use the
825 * $SYSTEMD_NSPAWN_SHARE_* environment variables instead. */
826 arg_clone_ns_flags
= 0;
830 r
= parse_boolean(optarg
);
832 log_error("Failed to parse --register= argument: %s", optarg
);
840 arg_keep_unit
= true;
843 case ARG_PERSONALITY
:
845 arg_personality
= personality_from_string(optarg
);
846 if (arg_personality
== PERSONALITY_INVALID
) {
847 log_error("Unknown or unsupported personality '%s'.", optarg
);
851 arg_settings_mask
|= SETTING_PERSONALITY
;
857 arg_volatile_mode
= VOLATILE_YES
;
861 m
= volatile_mode_from_string(optarg
);
863 log_error("Failed to parse --volatile= argument: %s", optarg
);
866 arg_volatile_mode
= m
;
869 arg_settings_mask
|= SETTING_VOLATILE_MODE
;
873 r
= expose_port_parse(&arg_expose_ports
, optarg
);
875 return log_error_errno(r
, "Duplicate port specification: %s", optarg
);
877 return log_error_errno(r
, "Failed to parse host port %s: %m", optarg
);
879 arg_settings_mask
|= SETTING_EXPOSE_PORTS
;
883 if (strv_extend(&arg_property
, optarg
) < 0)
888 case ARG_PRIVATE_USERS
: {
893 else if (!in_charset(optarg
, DIGITS
))
894 /* do *not* parse numbers as booleans */
895 boolean
= parse_boolean(optarg
);
897 if (boolean
== false) {
898 /* no: User namespacing off */
899 arg_userns_mode
= USER_NAMESPACE_NO
;
900 arg_uid_shift
= UID_INVALID
;
901 arg_uid_range
= UINT32_C(0x10000);
902 } else if (boolean
== true) {
903 /* yes: User namespacing on, UID range is read from root dir */
904 arg_userns_mode
= USER_NAMESPACE_FIXED
;
905 arg_uid_shift
= UID_INVALID
;
906 arg_uid_range
= UINT32_C(0x10000);
907 } else if (streq(optarg
, "pick")) {
908 /* pick: User namespacing on, UID range is picked randomly */
909 arg_userns_mode
= USER_NAMESPACE_PICK
;
910 arg_uid_shift
= UID_INVALID
;
911 arg_uid_range
= UINT32_C(0x10000);
913 _cleanup_free_
char *buffer
= NULL
;
914 const char *range
, *shift
;
916 /* anything else: User namespacing on, UID range is explicitly configured */
918 range
= strchr(optarg
, ':');
920 buffer
= strndup(optarg
, range
- optarg
);
926 r
= safe_atou32(range
, &arg_uid_range
);
928 return log_error_errno(r
, "Failed to parse UID range \"%s\": %m", range
);
932 r
= parse_uid(shift
, &arg_uid_shift
);
934 return log_error_errno(r
, "Failed to parse UID \"%s\": %m", optarg
);
936 arg_userns_mode
= USER_NAMESPACE_FIXED
;
939 if (arg_uid_range
<= 0) {
940 log_error("UID range cannot be 0.");
944 arg_settings_mask
|= SETTING_USERNS
;
949 if (userns_supported()) {
950 arg_userns_mode
= USER_NAMESPACE_PICK
;
951 arg_uid_shift
= UID_INVALID
;
952 arg_uid_range
= UINT32_C(0x10000);
954 arg_settings_mask
|= SETTING_USERNS
;
959 case ARG_PRIVATE_USERS_CHOWN
:
960 arg_userns_chown
= true;
962 arg_settings_mask
|= SETTING_USERNS
;
965 case ARG_KILL_SIGNAL
:
966 arg_kill_signal
= signal_from_string_try_harder(optarg
);
967 if (arg_kill_signal
< 0) {
968 log_error("Cannot parse signal: %s", optarg
);
972 arg_settings_mask
|= SETTING_KILL_SIGNAL
;
977 /* no → do not read files
978 * yes → read files, do not override cmdline, trust only subset
979 * override → read files, override cmdline, trust only subset
980 * trusted → read files, do not override cmdline, trust all
983 r
= parse_boolean(optarg
);
985 if (streq(optarg
, "trusted")) {
986 mask_all_settings
= false;
987 mask_no_settings
= false;
988 arg_settings_trusted
= true;
990 } else if (streq(optarg
, "override")) {
991 mask_all_settings
= false;
992 mask_no_settings
= true;
993 arg_settings_trusted
= -1;
995 return log_error_errno(r
, "Failed to parse --settings= argument: %s", optarg
);
998 mask_all_settings
= false;
999 mask_no_settings
= false;
1000 arg_settings_trusted
= -1;
1003 mask_all_settings
= true;
1004 mask_no_settings
= false;
1005 arg_settings_trusted
= false;
1011 if (!path_is_absolute(optarg
)) {
1012 log_error("Working directory %s is not an absolute path.", optarg
);
1016 r
= free_and_strdup(&arg_chdir
, optarg
);
1020 arg_settings_mask
|= SETTING_WORKING_DIRECTORY
;
1023 case ARG_PIVOT_ROOT
:
1024 r
= pivot_root_parse(&arg_pivot_root_new
, &arg_pivot_root_old
, optarg
);
1026 return log_error_errno(r
, "Failed to parse --pivot-root= argument %s: %m", optarg
);
1028 arg_settings_mask
|= SETTING_PIVOT_ROOT
;
1031 case ARG_NOTIFY_READY
:
1032 r
= parse_boolean(optarg
);
1034 log_error("%s is not a valid notify mode. Valid modes are: yes, no, and ready.", optarg
);
1037 arg_notify_ready
= r
;
1038 arg_settings_mask
|= SETTING_NOTIFY_READY
;
1041 case ARG_ROOT_HASH
: {
1045 r
= unhexmem(optarg
, strlen(optarg
), &k
, &l
);
1047 return log_error_errno(r
, "Failed to parse root hash: %s", optarg
);
1048 if (l
< sizeof(sd_id128_t
)) {
1049 log_error("Root hash must be at least 128bit long: %s", optarg
);
1054 free(arg_root_hash
);
1056 arg_root_hash_size
= l
;
1060 case ARG_SYSTEM_CALL_FILTER
: {
1064 negative
= optarg
[0] == '~';
1065 items
= negative
? optarg
+ 1 : optarg
;
1068 _cleanup_free_
char *word
= NULL
;
1070 r
= extract_first_word(&items
, &word
, NULL
, 0);
1076 return log_error_errno(r
, "Failed to parse system call filter: %m");
1079 r
= strv_extend(&arg_syscall_blacklist
, word
);
1081 r
= strv_extend(&arg_syscall_whitelist
, word
);
1086 arg_settings_mask
|= SETTING_SYSCALL_FILTER
;
1094 assert_not_reached("Unhandled option");
1097 parse_share_ns_env("SYSTEMD_NSPAWN_SHARE_NS_IPC", CLONE_NEWIPC
);
1098 parse_share_ns_env("SYSTEMD_NSPAWN_SHARE_NS_PID", CLONE_NEWPID
);
1099 parse_share_ns_env("SYSTEMD_NSPAWN_SHARE_NS_UTS", CLONE_NEWUTS
);
1100 parse_share_ns_env("SYSTEMD_NSPAWN_SHARE_SYSTEM", CLONE_NEWIPC
|CLONE_NEWPID
|CLONE_NEWUTS
);
1102 if (arg_userns_mode
!= USER_NAMESPACE_NO
)
1103 arg_mount_settings
|= MOUNT_USE_USERNS
;
1105 if (arg_private_network
)
1106 arg_mount_settings
|= MOUNT_APPLY_APIVFS_NETNS
;
1108 parse_mount_settings_env();
1110 if (!(arg_clone_ns_flags
& CLONE_NEWPID
) ||
1111 !(arg_clone_ns_flags
& CLONE_NEWUTS
)) {
1112 arg_register
= false;
1113 if (arg_start_mode
!= START_PID1
) {
1114 log_error("--boot cannot be used without namespacing.");
1119 if (arg_userns_mode
== USER_NAMESPACE_PICK
)
1120 arg_userns_chown
= true;
1122 if (arg_keep_unit
&& arg_register
&& cg_pid_get_owner_uid(0, NULL
) >= 0) {
1123 log_error("--keep-unit --register=yes may not be used when invoked from a user session.");
1127 if (arg_directory
&& arg_image
) {
1128 log_error("--directory= and --image= may not be combined.");
1132 if (arg_template
&& arg_image
) {
1133 log_error("--template= and --image= may not be combined.");
1137 if (arg_ephemeral
&& arg_template
&& !arg_directory
) {
1138 /* User asked for ephemeral execution but specified --template= instead of --directory=. Semantically
1139 * such an invocation makes some sense, see https://github.com/systemd/systemd/issues/3667. Let's
1140 * accept this here, and silently make "--ephemeral --template=" equivalent to "--ephemeral
1143 arg_directory
= arg_template
;
1144 arg_template
= NULL
;
1147 if (arg_template
&& !(arg_directory
|| arg_machine
)) {
1148 log_error("--template= needs --directory= or --machine=.");
1152 if (arg_ephemeral
&& arg_template
) {
1153 log_error("--ephemeral and --template= may not be combined.");
1157 if (arg_ephemeral
&& !IN_SET(arg_link_journal
, LINK_NO
, LINK_AUTO
)) {
1158 log_error("--ephemeral and --link-journal= may not be combined.");
1162 if (arg_userns_mode
!= USER_NAMESPACE_NO
&& !userns_supported()) {
1163 log_error("--private-users= is not supported, kernel compiled without user namespace support.");
1167 if (arg_userns_chown
&& arg_read_only
) {
1168 log_error("--read-only and --private-users-chown may not be combined.");
1172 if (arg_network_bridge
&& arg_network_zone
) {
1173 log_error("--network-bridge= and --network-zone= may not be combined.");
1177 if (argc
> optind
) {
1178 arg_parameters
= strv_copy(argv
+ optind
);
1179 if (!arg_parameters
)
1182 arg_settings_mask
|= SETTING_START_MODE
;
1185 /* Load all settings from .nspawn files */
1186 if (mask_no_settings
)
1187 arg_settings_mask
= 0;
1189 /* Don't load any settings from .nspawn files */
1190 if (mask_all_settings
)
1191 arg_settings_mask
= _SETTINGS_MASK_ALL
;
1193 arg_caps_retain
= (arg_caps_retain
| plus
| (arg_private_network
? 1ULL << CAP_NET_ADMIN
: 0)) & ~minus
;
1195 r
= cg_unified_flush();
1197 return log_error_errno(r
, "Failed to determine whether the unified cgroups hierarchy is used: %m");
1199 e
= getenv("SYSTEMD_NSPAWN_CONTAINER_SERVICE");
1201 arg_container_service_name
= e
;
1203 r
= getenv_bool("SYSTEMD_NSPAWN_USE_CGNS");
1205 arg_use_cgns
= cg_ns_supported();
1209 r
= custom_mount_check_all();
1216 static int verify_arguments(void) {
1217 if (arg_userns_mode
!= USER_NAMESPACE_NO
&& (arg_mount_settings
& MOUNT_APPLY_APIVFS_NETNS
) && !arg_private_network
) {
1218 log_error("Invalid namespacing settings. Mounting sysfs with --private-users requires --private-network.");
1222 if (arg_userns_mode
!= USER_NAMESPACE_NO
&& !(arg_mount_settings
& MOUNT_APPLY_APIVFS_RO
)) {
1223 log_error("Cannot combine --private-users with read-write mounts.");
1227 if (arg_volatile_mode
!= VOLATILE_NO
&& arg_read_only
) {
1228 log_error("Cannot combine --read-only with --volatile. Note that --volatile already implies a read-only base hierarchy.");
1232 if (arg_expose_ports
&& !arg_private_network
) {
1233 log_error("Cannot use --port= without private networking.");
1237 #ifndef HAVE_LIBIPTC
1238 if (arg_expose_ports
) {
1239 log_error("--port= is not supported, compiled without libiptc support.");
1244 if (arg_start_mode
== START_BOOT
&& arg_kill_signal
<= 0)
1245 arg_kill_signal
= SIGRTMIN
+3;
1250 static int userns_lchown(const char *p
, uid_t uid
, gid_t gid
) {
1253 if (arg_userns_mode
== USER_NAMESPACE_NO
)
1256 if (uid
== UID_INVALID
&& gid
== GID_INVALID
)
1259 if (uid
!= UID_INVALID
) {
1260 uid
+= arg_uid_shift
;
1262 if (uid
< arg_uid_shift
|| uid
>= arg_uid_shift
+ arg_uid_range
)
1266 if (gid
!= GID_INVALID
) {
1267 gid
+= (gid_t
) arg_uid_shift
;
1269 if (gid
< (gid_t
) arg_uid_shift
|| gid
>= (gid_t
) (arg_uid_shift
+ arg_uid_range
))
1273 if (lchown(p
, uid
, gid
) < 0)
1279 static int userns_mkdir(const char *root
, const char *path
, mode_t mode
, uid_t uid
, gid_t gid
) {
1282 q
= prefix_roota(root
, path
);
1283 if (mkdir(q
, mode
) < 0) {
1284 if (errno
== EEXIST
)
1289 return userns_lchown(q
, uid
, gid
);
1292 static int setup_timezone(const char *dest
) {
1293 _cleanup_free_
char *p
= NULL
, *q
= NULL
;
1294 const char *where
, *check
, *what
;
1300 /* Fix the timezone, if possible */
1301 r
= readlink_malloc("/etc/localtime", &p
);
1303 log_warning("host's /etc/localtime is not a symlink, not updating container timezone.");
1304 /* to handle warning, delete /etc/localtime and replace it
1305 * with a symbolic link to a time zone data file.
1308 * ln -s /usr/share/zoneinfo/UTC /etc/localtime
1313 z
= path_startswith(p
, "../usr/share/zoneinfo/");
1315 z
= path_startswith(p
, "/usr/share/zoneinfo/");
1317 log_warning("/etc/localtime does not point into /usr/share/zoneinfo/, not updating container timezone.");
1321 where
= prefix_roota(dest
, "/etc/localtime");
1322 r
= readlink_malloc(where
, &q
);
1324 y
= path_startswith(q
, "../usr/share/zoneinfo/");
1326 y
= path_startswith(q
, "/usr/share/zoneinfo/");
1328 /* Already pointing to the right place? Then do nothing .. */
1329 if (y
&& streq(y
, z
))
1333 check
= strjoina("/usr/share/zoneinfo/", z
);
1334 check
= prefix_roota(dest
, check
);
1335 if (laccess(check
, F_OK
) < 0) {
1336 log_warning("Timezone %s does not exist in container, not updating container timezone.", z
);
1340 if (unlink(where
) < 0 && errno
!= ENOENT
) {
1341 log_full_errno(IN_SET(errno
, EROFS
, EACCES
, EPERM
) ? LOG_DEBUG
: LOG_WARNING
, /* Don't complain on read-only images */
1343 "Failed to remove existing timezone info %s in container, ignoring: %m", where
);
1347 what
= strjoina("../usr/share/zoneinfo/", z
);
1348 if (symlink(what
, where
) < 0) {
1349 log_full_errno(IN_SET(errno
, EROFS
, EACCES
, EPERM
) ? LOG_DEBUG
: LOG_WARNING
,
1351 "Failed to correct timezone of container, ignoring: %m");
1355 r
= userns_lchown(where
, 0, 0);
1357 return log_warning_errno(r
, "Failed to chown /etc/localtime: %m");
1362 static int resolved_listening(void) {
1363 _cleanup_(sd_bus_flush_close_unrefp
) sd_bus
*bus
= NULL
;
1364 _cleanup_free_
char *dns_stub_listener_mode
= NULL
;
1367 /* Check if resolved is listening */
1369 r
= sd_bus_open_system(&bus
);
1373 r
= bus_name_has_owner(bus
, "org.freedesktop.resolve1", NULL
);
1377 r
= sd_bus_get_property_string(bus
,
1378 "org.freedesktop.resolve1",
1379 "/org/freedesktop/resolve1",
1380 "org.freedesktop.resolve1.Manager",
1383 &dns_stub_listener_mode
);
1387 return STR_IN_SET(dns_stub_listener_mode
, "udp", "yes");
1390 static int setup_resolv_conf(const char *dest
) {
1391 _cleanup_free_
char *resolved
= NULL
, *etc
= NULL
;
1397 if (arg_private_network
)
1400 r
= chase_symlinks("/etc", dest
, CHASE_PREFIX_ROOT
, &etc
);
1402 log_warning_errno(r
, "Failed to resolve /etc path in container, ignoring: %m");
1406 where
= strjoina(etc
, "/resolv.conf");
1407 found
= chase_symlinks(where
, dest
, CHASE_NONEXISTENT
, &resolved
);
1409 log_warning_errno(found
, "Failed to resolve /etc/resolv.conf path in container, ignoring: %m");
1413 if (access("/usr/lib/systemd/resolv.conf", F_OK
) >= 0 &&
1414 resolved_listening() > 0) {
1416 /* resolved is enabled on the host. In this, case bind mount its static resolv.conf file into the
1417 * container, so that the container can use the host's resolver. Given that network namespacing is
1418 * disabled it's only natural of the container also uses the host's resolver. It also has the big
1419 * advantage that the container will be able to follow the host's DNS server configuration changes
1422 if (found
== 0) /* missing? */
1423 (void) touch(resolved
);
1425 r
= mount_verbose(LOG_DEBUG
, "/usr/lib/systemd/resolv.conf", resolved
, NULL
, MS_BIND
, NULL
);
1427 return mount_verbose(LOG_ERR
, NULL
, resolved
, NULL
, MS_BIND
|MS_REMOUNT
|MS_RDONLY
|MS_NOSUID
|MS_NODEV
, NULL
);
1430 /* If that didn't work, let's copy the file */
1431 r
= copy_file("/etc/resolv.conf", where
, O_TRUNC
|O_NOFOLLOW
, 0644, 0, COPY_REFLINK
);
1433 /* If the file already exists as symlink, let's suppress the warning, under the assumption that
1434 * resolved or something similar runs inside and the symlink points there.
1436 * If the disk image is read-only, there's also no point in complaining.
1438 log_full_errno(IN_SET(r
, -ELOOP
, -EROFS
, -EACCES
, -EPERM
) ? LOG_DEBUG
: LOG_WARNING
, r
,
1439 "Failed to copy /etc/resolv.conf to %s, ignoring: %m", where
);
1443 r
= userns_lchown(where
, 0, 0);
1445 log_warning_errno(r
, "Failed to chown /etc/resolv.conf, ignoring: %m");
1450 static int setup_boot_id(const char *dest
) {
1451 sd_id128_t rnd
= SD_ID128_NULL
;
1452 const char *from
, *to
;
1455 /* Generate a new randomized boot ID, so that each boot-up of
1456 * the container gets a new one */
1458 from
= prefix_roota(dest
, "/run/proc-sys-kernel-random-boot-id");
1459 to
= prefix_roota(dest
, "/proc/sys/kernel/random/boot_id");
1461 r
= sd_id128_randomize(&rnd
);
1463 return log_error_errno(r
, "Failed to generate random boot id: %m");
1465 r
= id128_write(from
, ID128_UUID
, rnd
, false);
1467 return log_error_errno(r
, "Failed to write boot id: %m");
1469 r
= mount_verbose(LOG_ERR
, from
, to
, NULL
, MS_BIND
, NULL
);
1471 r
= mount_verbose(LOG_ERR
, NULL
, to
, NULL
,
1472 MS_BIND
|MS_REMOUNT
|MS_RDONLY
|MS_NOSUID
|MS_NODEV
, NULL
);
1474 (void) unlink(from
);
1478 static int copy_devnodes(const char *dest
) {
1480 static const char devnodes
[] =
1491 _cleanup_umask_ mode_t u
;
1497 /* Create /dev/net, so that we can create /dev/net/tun in it */
1498 if (userns_mkdir(dest
, "/dev/net", 0755, 0, 0) < 0)
1499 return log_error_errno(r
, "Failed to create /dev/net directory: %m");
1501 NULSTR_FOREACH(d
, devnodes
) {
1502 _cleanup_free_
char *from
= NULL
, *to
= NULL
;
1505 from
= strappend("/dev/", d
);
1506 to
= prefix_root(dest
, from
);
1508 if (stat(from
, &st
) < 0) {
1510 if (errno
!= ENOENT
)
1511 return log_error_errno(errno
, "Failed to stat %s: %m", from
);
1513 } else if (!S_ISCHR(st
.st_mode
) && !S_ISBLK(st
.st_mode
)) {
1515 log_error("%s is not a char or block device, cannot copy.", from
);
1519 if (mknod(to
, st
.st_mode
, st
.st_rdev
) < 0) {
1520 /* Explicitly warn the user when /dev is already populated. */
1521 if (errno
== EEXIST
)
1522 log_notice("%s/dev is pre-mounted and pre-populated. If a pre-mounted /dev is provided it needs to be an unpopulated file system.", dest
);
1524 return log_error_errno(errno
, "mknod(%s) failed: %m", to
);
1526 /* Some systems abusively restrict mknod but
1527 * allow bind mounts. */
1530 return log_error_errno(r
, "touch (%s) failed: %m", to
);
1531 r
= mount_verbose(LOG_DEBUG
, from
, to
, NULL
, MS_BIND
, NULL
);
1533 return log_error_errno(r
, "Both mknod and bind mount (%s) failed: %m", to
);
1536 r
= userns_lchown(to
, 0, 0);
1538 return log_error_errno(r
, "chown() of device node %s failed: %m", to
);
1545 static int setup_pts(const char *dest
) {
1546 _cleanup_free_
char *options
= NULL
;
1551 if (arg_selinux_apifs_context
)
1552 (void) asprintf(&options
,
1553 "newinstance,ptmxmode=0666,mode=620,gid=" GID_FMT
",context=\"%s\"",
1554 arg_uid_shift
+ TTY_GID
,
1555 arg_selinux_apifs_context
);
1558 (void) asprintf(&options
,
1559 "newinstance,ptmxmode=0666,mode=620,gid=" GID_FMT
,
1560 arg_uid_shift
+ TTY_GID
);
1565 /* Mount /dev/pts itself */
1566 p
= prefix_roota(dest
, "/dev/pts");
1567 if (mkdir(p
, 0755) < 0)
1568 return log_error_errno(errno
, "Failed to create /dev/pts: %m");
1569 r
= mount_verbose(LOG_ERR
, "devpts", p
, "devpts", MS_NOSUID
|MS_NOEXEC
, options
);
1572 r
= userns_lchown(p
, 0, 0);
1574 return log_error_errno(r
, "Failed to chown /dev/pts: %m");
1576 /* Create /dev/ptmx symlink */
1577 p
= prefix_roota(dest
, "/dev/ptmx");
1578 if (symlink("pts/ptmx", p
) < 0)
1579 return log_error_errno(errno
, "Failed to create /dev/ptmx symlink: %m");
1580 r
= userns_lchown(p
, 0, 0);
1582 return log_error_errno(r
, "Failed to chown /dev/ptmx: %m");
1584 /* And fix /dev/pts/ptmx ownership */
1585 p
= prefix_roota(dest
, "/dev/pts/ptmx");
1586 r
= userns_lchown(p
, 0, 0);
1588 return log_error_errno(r
, "Failed to chown /dev/pts/ptmx: %m");
1593 static int setup_dev_console(const char *dest
, const char *console
) {
1594 _cleanup_umask_ mode_t u
;
1603 r
= chmod_and_chown(console
, 0600, arg_uid_shift
, arg_uid_shift
);
1605 return log_error_errno(r
, "Failed to correct access mode for TTY: %m");
1607 /* We need to bind mount the right tty to /dev/console since
1608 * ptys can only exist on pts file systems. To have something
1609 * to bind mount things on we create a empty regular file. */
1611 to
= prefix_roota(dest
, "/dev/console");
1614 return log_error_errno(r
, "touch() for /dev/console failed: %m");
1616 return mount_verbose(LOG_ERR
, console
, to
, NULL
, MS_BIND
, NULL
);
1619 static int setup_kmsg(const char *dest
, int kmsg_socket
) {
1620 const char *from
, *to
;
1621 _cleanup_umask_ mode_t u
;
1624 assert(kmsg_socket
>= 0);
1628 /* We create the kmsg FIFO as /run/kmsg, but immediately
1629 * delete it after bind mounting it to /proc/kmsg. While FIFOs
1630 * on the reading side behave very similar to /proc/kmsg,
1631 * their writing side behaves differently from /dev/kmsg in
1632 * that writing blocks when nothing is reading. In order to
1633 * avoid any problems with containers deadlocking due to this
1634 * we simply make /dev/kmsg unavailable to the container. */
1635 from
= prefix_roota(dest
, "/run/kmsg");
1636 to
= prefix_roota(dest
, "/proc/kmsg");
1638 if (mkfifo(from
, 0600) < 0)
1639 return log_error_errno(errno
, "mkfifo() for /run/kmsg failed: %m");
1640 r
= mount_verbose(LOG_ERR
, from
, to
, NULL
, MS_BIND
, NULL
);
1644 fd
= open(from
, O_RDWR
|O_NDELAY
|O_CLOEXEC
);
1646 return log_error_errno(errno
, "Failed to open fifo: %m");
1648 /* Store away the fd in the socket, so that it stays open as
1649 * long as we run the child */
1650 r
= send_one_fd(kmsg_socket
, fd
, 0);
1654 return log_error_errno(r
, "Failed to send FIFO fd: %m");
1656 /* And now make the FIFO unavailable as /run/kmsg... */
1657 (void) unlink(from
);
1662 static int on_address_change(sd_netlink
*rtnl
, sd_netlink_message
*m
, void *userdata
) {
1663 union in_addr_union
*exposed
= userdata
;
1669 expose_port_execute(rtnl
, arg_expose_ports
, exposed
);
1673 static int setup_hostname(void) {
1675 if ((arg_clone_ns_flags
& CLONE_NEWUTS
) == 0)
1678 if (sethostname_idempotent(arg_machine
) < 0)
1684 static int setup_journal(const char *directory
) {
1686 _cleanup_free_
char *d
= NULL
;
1692 /* Don't link journals in ephemeral mode */
1696 if (arg_link_journal
== LINK_NO
)
1699 try = arg_link_journal_try
|| arg_link_journal
== LINK_AUTO
;
1701 r
= sd_id128_get_machine(&this_id
);
1703 return log_error_errno(r
, "Failed to retrieve machine ID: %m");
1705 if (sd_id128_equal(arg_uuid
, this_id
)) {
1706 log_full(try ? LOG_WARNING
: LOG_ERR
,
1707 "Host and machine ids are equal (%s): refusing to link journals", sd_id128_to_string(arg_uuid
, id
));
1713 r
= userns_mkdir(directory
, "/var", 0755, 0, 0);
1715 return log_error_errno(r
, "Failed to create /var: %m");
1717 r
= userns_mkdir(directory
, "/var/log", 0755, 0, 0);
1719 return log_error_errno(r
, "Failed to create /var/log: %m");
1721 r
= userns_mkdir(directory
, "/var/log/journal", 0755, 0, 0);
1723 return log_error_errno(r
, "Failed to create /var/log/journal: %m");
1725 (void) sd_id128_to_string(arg_uuid
, id
);
1727 p
= strjoina("/var/log/journal/", id
);
1728 q
= prefix_roota(directory
, p
);
1730 if (path_is_mount_point(p
, NULL
, 0) > 0) {
1734 log_error("%s: already a mount point, refusing to use for journal", p
);
1738 if (path_is_mount_point(q
, NULL
, 0) > 0) {
1742 log_error("%s: already a mount point, refusing to use for journal", q
);
1746 r
= readlink_and_make_absolute(p
, &d
);
1748 if ((arg_link_journal
== LINK_GUEST
||
1749 arg_link_journal
== LINK_AUTO
) &&
1752 r
= userns_mkdir(directory
, p
, 0755, 0, 0);
1754 log_warning_errno(r
, "Failed to create directory %s: %m", q
);
1759 return log_error_errno(errno
, "Failed to remove symlink %s: %m", p
);
1760 } else if (r
== -EINVAL
) {
1762 if (arg_link_journal
== LINK_GUEST
&&
1765 if (errno
== ENOTDIR
) {
1766 log_error("%s already exists and is neither a symlink nor a directory", p
);
1769 return log_error_errno(errno
, "Failed to remove %s: %m", p
);
1771 } else if (r
!= -ENOENT
)
1772 return log_error_errno(r
, "readlink(%s) failed: %m", p
);
1774 if (arg_link_journal
== LINK_GUEST
) {
1776 if (symlink(q
, p
) < 0) {
1778 log_debug_errno(errno
, "Failed to symlink %s to %s, skipping journal setup: %m", q
, p
);
1781 return log_error_errno(errno
, "Failed to symlink %s to %s: %m", q
, p
);
1784 r
= userns_mkdir(directory
, p
, 0755, 0, 0);
1786 log_warning_errno(r
, "Failed to create directory %s: %m", q
);
1790 if (arg_link_journal
== LINK_HOST
) {
1791 /* don't create parents here — if the host doesn't have
1792 * permanent journal set up, don't force it here */
1794 if (mkdir(p
, 0755) < 0 && errno
!= EEXIST
) {
1796 log_debug_errno(errno
, "Failed to create %s, skipping journal setup: %m", p
);
1799 return log_error_errno(errno
, "Failed to create %s: %m", p
);
1802 } else if (access(p
, F_OK
) < 0)
1805 if (dir_is_empty(q
) == 0)
1806 log_warning("%s is not empty, proceeding anyway.", q
);
1808 r
= userns_mkdir(directory
, p
, 0755, 0, 0);
1810 return log_error_errno(r
, "Failed to create %s: %m", q
);
1812 r
= mount_verbose(LOG_DEBUG
, p
, q
, NULL
, MS_BIND
, NULL
);
1814 return log_error_errno(errno
, "Failed to bind mount journal from host into guest: %m");
1819 static int drop_capabilities(void) {
1820 return capability_bounding_set_drop(arg_caps_retain
, false);
1823 static int reset_audit_loginuid(void) {
1824 _cleanup_free_
char *p
= NULL
;
1827 if ((arg_clone_ns_flags
& CLONE_NEWPID
) == 0)
1830 r
= read_one_line_file("/proc/self/loginuid", &p
);
1834 return log_error_errno(r
, "Failed to read /proc/self/loginuid: %m");
1836 /* Already reset? */
1837 if (streq(p
, "4294967295"))
1840 r
= write_string_file("/proc/self/loginuid", "4294967295", 0);
1843 "Failed to reset audit login UID. This probably means that your kernel is too\n"
1844 "old and you have audit enabled. Note that the auditing subsystem is known to\n"
1845 "be incompatible with containers on old kernels. Please make sure to upgrade\n"
1846 "your kernel or to off auditing with 'audit=0' on the kernel command line before\n"
1847 "using systemd-nspawn. Sleeping for 5s... (%m)");
1856 static int setup_propagate(const char *root
) {
1860 (void) mkdir_p("/run/systemd/nspawn/", 0755);
1861 (void) mkdir_p("/run/systemd/nspawn/propagate", 0600);
1862 p
= strjoina("/run/systemd/nspawn/propagate/", arg_machine
);
1863 (void) mkdir_p(p
, 0600);
1865 r
= userns_mkdir(root
, "/run/systemd", 0755, 0, 0);
1867 return log_error_errno(r
, "Failed to create /run/systemd: %m");
1869 r
= userns_mkdir(root
, "/run/systemd/nspawn", 0755, 0, 0);
1871 return log_error_errno(r
, "Failed to create /run/systemd/nspawn: %m");
1873 r
= userns_mkdir(root
, "/run/systemd/nspawn/incoming", 0600, 0, 0);
1875 return log_error_errno(r
, "Failed to create /run/systemd/nspawn/incoming: %m");
1877 q
= prefix_roota(root
, "/run/systemd/nspawn/incoming");
1878 r
= mount_verbose(LOG_ERR
, p
, q
, NULL
, MS_BIND
, NULL
);
1882 r
= mount_verbose(LOG_ERR
, NULL
, q
, NULL
, MS_BIND
|MS_REMOUNT
|MS_RDONLY
, NULL
);
1886 /* machined will MS_MOVE into that directory, and that's only
1887 * supported for non-shared mounts. */
1888 return mount_verbose(LOG_ERR
, NULL
, q
, NULL
, MS_SLAVE
, NULL
);
1891 static int setup_machine_id(const char *directory
) {
1892 const char *etc_machine_id
;
1896 /* If the UUID in the container is already set, then that's what counts, and we use. If it isn't set, and the
1897 * caller passed --uuid=, then we'll pass it in the $container_uuid env var to PID 1 of the container. The
1898 * assumption is that PID 1 will then write it to /etc/machine-id to make it persistent. If --uuid= is not
1899 * passed we generate a random UUID, and pass it via $container_uuid. In effect this means that /etc/machine-id
1900 * in the container and our idea of the container UUID will always be in sync (at least if PID 1 in the
1901 * container behaves nicely). */
1903 etc_machine_id
= prefix_roota(directory
, "/etc/machine-id");
1905 r
= id128_read(etc_machine_id
, ID128_PLAIN
, &id
);
1907 if (!IN_SET(r
, -ENOENT
, -ENOMEDIUM
)) /* If the file is missing or empty, we don't mind */
1908 return log_error_errno(r
, "Failed to read machine ID from container image: %m");
1910 if (sd_id128_is_null(arg_uuid
)) {
1911 r
= sd_id128_randomize(&arg_uuid
);
1913 return log_error_errno(r
, "Failed to acquire randomized machine UUID: %m");
1916 if (sd_id128_is_null(id
)) {
1917 log_error("Machine ID in container image is zero, refusing.");
1927 static int recursive_chown(const char *directory
, uid_t shift
, uid_t range
) {
1932 if (arg_userns_mode
== USER_NAMESPACE_NO
|| !arg_userns_chown
)
1935 r
= path_patch_uid(directory
, arg_uid_shift
, arg_uid_range
);
1936 if (r
== -EOPNOTSUPP
)
1937 return log_error_errno(r
, "Automatic UID/GID adjusting is only supported for UID/GID ranges starting at multiples of 2^16 with a range of 2^16.");
1939 return log_error_errno(r
, "Upper 16 bits of root directory UID and GID do not match.");
1941 return log_error_errno(r
, "Failed to adjust UID/GID shift of OS tree: %m");
1943 log_debug("Root directory of image is already owned by the right UID/GID range, skipping recursive chown operation.");
1945 log_debug("Patched directory tree to match UID/GID range.");
1952 * < 0 : wait_for_terminate() failed to get the state of the
1953 * container, the container was terminated by a signal, or
1954 * failed for an unknown reason. No change is made to the
1955 * container argument.
1956 * > 0 : The program executed in the container terminated with an
1957 * error. The exit code of the program executed in the
1958 * container is returned. The container argument has been set
1959 * to CONTAINER_TERMINATED.
1960 * 0 : The container is being rebooted, has been shut down or exited
1961 * successfully. The container argument has been set to either
1962 * CONTAINER_TERMINATED or CONTAINER_REBOOTED.
1964 * That is, success is indicated by a return value of zero, and an
1965 * error is indicated by a non-zero value.
1967 static int wait_for_container(pid_t pid
, ContainerStatus
*container
) {
1971 r
= wait_for_terminate(pid
, &status
);
1973 return log_warning_errno(r
, "Failed to wait for container: %m");
1975 switch (status
.si_code
) {
1978 if (status
.si_status
== 0)
1979 log_full(arg_quiet
? LOG_DEBUG
: LOG_INFO
, "Container %s exited successfully.", arg_machine
);
1981 log_full(arg_quiet
? LOG_DEBUG
: LOG_INFO
, "Container %s failed with error code %i.", arg_machine
, status
.si_status
);
1983 *container
= CONTAINER_TERMINATED
;
1984 return status
.si_status
;
1987 if (status
.si_status
== SIGINT
) {
1988 log_full(arg_quiet
? LOG_DEBUG
: LOG_INFO
, "Container %s has been shut down.", arg_machine
);
1989 *container
= CONTAINER_TERMINATED
;
1992 } else if (status
.si_status
== SIGHUP
) {
1993 log_full(arg_quiet
? LOG_DEBUG
: LOG_INFO
, "Container %s is being rebooted.", arg_machine
);
1994 *container
= CONTAINER_REBOOTED
;
2001 log_error("Container %s terminated by signal %s.", arg_machine
, signal_to_string(status
.si_status
));
2005 log_error("Container %s failed due to unknown reason.", arg_machine
);
2010 static int on_orderly_shutdown(sd_event_source
*s
, const struct signalfd_siginfo
*si
, void *userdata
) {
2013 pid
= PTR_TO_PID(userdata
);
2015 if (kill(pid
, arg_kill_signal
) >= 0) {
2016 log_info("Trying to halt container. Send SIGTERM again to trigger immediate termination.");
2017 sd_event_source_set_userdata(s
, NULL
);
2022 sd_event_exit(sd_event_source_get_event(s
), 0);
2026 static int on_sigchld(sd_event_source
*s
, const struct signalfd_siginfo
*ssi
, void *userdata
) {
2029 if (waitid(P_ALL
, 0, &si
, WNOHANG
|WNOWAIT
|WEXITED
) < 0)
2030 return log_error_errno(errno
, "Failed to waitid(): %m");
2031 if (si
.si_pid
== 0) /* No pending children. */
2033 if (si
.si_pid
== PTR_TO_PID(userdata
)) {
2034 /* The main process we care for has exited. Return from
2035 * signal handler but leave the zombie. */
2036 sd_event_exit(sd_event_source_get_event(s
), 0);
2039 /* Reap all other children. */
2040 (void) waitid(P_PID
, si
.si_pid
, &si
, WNOHANG
|WEXITED
);
2046 static int determine_names(void) {
2049 if (arg_template
&& !arg_directory
&& arg_machine
) {
2051 /* If --template= was specified then we should not
2052 * search for a machine, but instead create a new one
2053 * in /var/lib/machine. */
2055 arg_directory
= strjoin("/var/lib/machines/", arg_machine
);
2060 if (!arg_image
&& !arg_directory
) {
2062 _cleanup_(image_unrefp
) Image
*i
= NULL
;
2064 r
= image_find(arg_machine
, &i
);
2066 return log_error_errno(r
, "Failed to find image for machine '%s': %m", arg_machine
);
2068 log_error("No image for machine '%s'.", arg_machine
);
2072 if (i
->type
== IMAGE_RAW
)
2073 r
= free_and_strdup(&arg_image
, i
->path
);
2075 r
= free_and_strdup(&arg_directory
, i
->path
);
2080 arg_read_only
= arg_read_only
|| i
->read_only
;
2082 arg_directory
= get_current_dir_name();
2084 if (!arg_directory
&& !arg_image
) {
2085 log_error("Failed to determine path, please use -D or -i.");
2092 if (arg_directory
&& path_equal(arg_directory
, "/"))
2093 arg_machine
= gethostname_malloc();
2098 arg_machine
= strdup(basename(arg_image
));
2100 /* Truncate suffix if there is one */
2101 e
= endswith(arg_machine
, ".raw");
2105 arg_machine
= strdup(basename(arg_directory
));
2110 hostname_cleanup(arg_machine
);
2111 if (!machine_name_is_valid(arg_machine
)) {
2112 log_error("Failed to determine machine name automatically, please use -M.");
2116 if (arg_ephemeral
) {
2119 /* Add a random suffix when this is an
2120 * ephemeral machine, so that we can run many
2121 * instances at once without manually having
2122 * to specify -M each time. */
2124 if (asprintf(&b
, "%s-%016" PRIx64
, arg_machine
, random_u64()) < 0)
2135 static int chase_symlinks_and_update(char **p
, unsigned flags
) {
2144 r
= chase_symlinks(*p
, NULL
, flags
, &chased
);
2146 return log_error_errno(r
, "Failed to resolve path %s: %m", *p
);
2154 static int determine_uid_shift(const char *directory
) {
2157 if (arg_userns_mode
== USER_NAMESPACE_NO
) {
2162 if (arg_uid_shift
== UID_INVALID
) {
2165 r
= stat(directory
, &st
);
2167 return log_error_errno(errno
, "Failed to determine UID base of %s: %m", directory
);
2169 arg_uid_shift
= st
.st_uid
& UINT32_C(0xffff0000);
2171 if (arg_uid_shift
!= (st
.st_gid
& UINT32_C(0xffff0000))) {
2172 log_error("UID and GID base of %s don't match.", directory
);
2176 arg_uid_range
= UINT32_C(0x10000);
2179 if (arg_uid_shift
> (uid_t
) -1 - arg_uid_range
) {
2180 log_error("UID base too high for UID range.");
2187 static int inner_child(
2189 const char *directory
,
2195 _cleanup_free_
char *home
= NULL
;
2198 const char *envp
[] = {
2199 "PATH=" DEFAULT_PATH_SPLIT_USR
,
2200 NULL
, /* container */
2205 NULL
, /* container_uuid */
2206 NULL
, /* LISTEN_FDS */
2207 NULL
, /* LISTEN_PID */
2208 NULL
, /* NOTIFY_SOCKET */
2211 const char *exec_target
;
2213 _cleanup_strv_free_
char **env_use
= NULL
;
2218 assert(kmsg_socket
>= 0);
2220 if (arg_userns_mode
!= USER_NAMESPACE_NO
) {
2221 /* Tell the parent, that it now can write the UID map. */
2222 (void) barrier_place(barrier
); /* #1 */
2224 /* Wait until the parent wrote the UID map */
2225 if (!barrier_place_and_sync(barrier
)) { /* #2 */
2226 log_error("Parent died too early");
2231 r
= reset_uid_gid();
2233 return log_error_errno(r
, "Couldn't become new root: %m");
2236 arg_mount_settings
| MOUNT_IN_USERNS
,
2239 arg_selinux_apifs_context
);
2244 r
= mount_sysfs(NULL
, arg_mount_settings
);
2248 /* Wait until we are cgroup-ified, so that we
2249 * can mount the right cgroup path writable */
2250 if (!barrier_place_and_sync(barrier
)) { /* #3 */
2251 log_error("Parent died too early");
2255 if (arg_use_cgns
&& cg_ns_supported()) {
2256 r
= unshare(CLONE_NEWCGROUP
);
2258 return log_error_errno(errno
, "Failed to unshare cgroup namespace");
2261 arg_unified_cgroup_hierarchy
,
2262 arg_userns_mode
!= USER_NAMESPACE_NO
,
2265 arg_selinux_apifs_context
,
2270 r
= mount_systemd_cgroup_writable("", arg_unified_cgroup_hierarchy
);
2275 r
= setup_boot_id(NULL
);
2279 r
= setup_kmsg(NULL
, kmsg_socket
);
2282 kmsg_socket
= safe_close(kmsg_socket
);
2287 return log_error_errno(errno
, "setsid() failed: %m");
2289 if (arg_private_network
)
2292 if (arg_expose_ports
) {
2293 r
= expose_port_send_rtnl(rtnl_socket
);
2296 rtnl_socket
= safe_close(rtnl_socket
);
2299 r
= drop_capabilities();
2301 return log_error_errno(r
, "drop_capabilities() failed: %m");
2305 if (arg_personality
!= PERSONALITY_INVALID
) {
2306 r
= safe_personality(arg_personality
);
2308 return log_error_errno(r
, "personality() failed: %m");
2309 } else if (secondary
) {
2310 r
= safe_personality(PER_LINUX32
);
2312 return log_error_errno(r
, "personality() failed: %m");
2316 if (arg_selinux_context
)
2317 if (setexeccon(arg_selinux_context
) < 0)
2318 return log_error_errno(errno
, "setexeccon(\"%s\") failed: %m", arg_selinux_context
);
2321 r
= change_uid_gid(arg_user
, &home
);
2325 /* LXC sets container=lxc, so follow the scheme here */
2326 envp
[n_env
++] = strjoina("container=", arg_container_service_name
);
2328 envp
[n_env
] = strv_find_prefix(environ
, "TERM=");
2332 if ((asprintf((char**)(envp
+ n_env
++), "HOME=%s", home
? home
: "/root") < 0) ||
2333 (asprintf((char**)(envp
+ n_env
++), "USER=%s", arg_user
? arg_user
: "root") < 0) ||
2334 (asprintf((char**)(envp
+ n_env
++), "LOGNAME=%s", arg_user
? arg_user
: "root") < 0))
2337 assert(!sd_id128_is_null(arg_uuid
));
2339 if (asprintf((char**)(envp
+ n_env
++), "container_uuid=%s", id128_to_uuid_string(arg_uuid
, as_uuid
)) < 0)
2342 if (fdset_size(fds
) > 0) {
2343 r
= fdset_cloexec(fds
, false);
2345 return log_error_errno(r
, "Failed to unset O_CLOEXEC for file descriptors.");
2347 if ((asprintf((char **)(envp
+ n_env
++), "LISTEN_FDS=%u", fdset_size(fds
)) < 0) ||
2348 (asprintf((char **)(envp
+ n_env
++), "LISTEN_PID=1") < 0))
2351 if (asprintf((char **)(envp
+ n_env
++), "NOTIFY_SOCKET=%s", NSPAWN_NOTIFY_SOCKET_PATH
) < 0)
2354 env_use
= strv_env_merge(2, envp
, arg_setenv
);
2358 /* Let the parent know that we are ready and
2359 * wait until the parent is ready with the
2361 if (!barrier_place_and_sync(barrier
)) { /* #4 */
2362 log_error("Parent died too early");
2367 if (chdir(arg_chdir
) < 0)
2368 return log_error_errno(errno
, "Failed to change to specified working directory %s: %m", arg_chdir
);
2370 if (arg_start_mode
== START_PID2
) {
2371 r
= stub_pid1(arg_uuid
);
2376 /* Now, explicitly close the log, so that we
2377 * then can close all remaining fds. Closing
2378 * the log explicitly first has the benefit
2379 * that the logging subsystem knows about it,
2380 * and is thus ready to be reopened should we
2381 * need it again. Note that the other fds
2382 * closed here are at least the locking and
2385 (void) fdset_close_others(fds
);
2387 if (arg_start_mode
== START_BOOT
) {
2391 /* Automatically search for the init system */
2393 m
= strv_length(arg_parameters
);
2394 a
= newa(char*, m
+ 2);
2395 memcpy_safe(a
+ 1, arg_parameters
, m
* sizeof(char*));
2398 a
[0] = (char*) "/usr/lib/systemd/systemd";
2399 execve(a
[0], a
, env_use
);
2401 a
[0] = (char*) "/lib/systemd/systemd";
2402 execve(a
[0], a
, env_use
);
2404 a
[0] = (char*) "/sbin/init";
2405 execve(a
[0], a
, env_use
);
2407 exec_target
= "/usr/lib/systemd/systemd, /lib/systemd/systemd, /sbin/init";
2408 } else if (!strv_isempty(arg_parameters
)) {
2409 exec_target
= arg_parameters
[0];
2410 execvpe(arg_parameters
[0], arg_parameters
, env_use
);
2413 /* If we cannot change the directory, we'll end up in /, that is expected. */
2414 (void) chdir(home
?: "/root");
2416 execle("/bin/bash", "-bash", NULL
, env_use
);
2417 execle("/bin/sh", "-sh", NULL
, env_use
);
2419 exec_target
= "/bin/bash, /bin/sh";
2424 return log_error_errno(r
, "execv(%s) failed: %m", exec_target
);
2427 static int setup_sd_notify_child(void) {
2428 static const int one
= 1;
2430 union sockaddr_union sa
= {
2431 .sa
.sa_family
= AF_UNIX
,
2435 fd
= socket(AF_UNIX
, SOCK_DGRAM
|SOCK_CLOEXEC
|SOCK_NONBLOCK
, 0);
2437 return log_error_errno(errno
, "Failed to allocate notification socket: %m");
2439 (void) mkdir_parents(NSPAWN_NOTIFY_SOCKET_PATH
, 0755);
2440 (void) unlink(NSPAWN_NOTIFY_SOCKET_PATH
);
2442 strncpy(sa
.un
.sun_path
, NSPAWN_NOTIFY_SOCKET_PATH
, sizeof(sa
.un
.sun_path
)-1);
2443 r
= bind(fd
, &sa
.sa
, SOCKADDR_UN_LEN(sa
.un
));
2446 return log_error_errno(errno
, "bind(%s) failed: %m", sa
.un
.sun_path
);
2449 r
= userns_lchown(NSPAWN_NOTIFY_SOCKET_PATH
, 0, 0);
2452 return log_error_errno(r
, "Failed to chown " NSPAWN_NOTIFY_SOCKET_PATH
": %m");
2455 r
= setsockopt(fd
, SOL_SOCKET
, SO_PASSCRED
, &one
, sizeof(one
));
2458 return log_error_errno(errno
, "SO_PASSCRED failed: %m");
2464 static int outer_child(
2466 const char *directory
,
2467 const char *console
,
2468 DissectedImage
*dissected_image
,
2476 int uid_shift_socket
,
2482 _cleanup_close_
int fd
= -1;
2487 assert(pid_socket
>= 0);
2488 assert(uuid_socket
>= 0);
2489 assert(notify_socket
>= 0);
2490 assert(kmsg_socket
>= 0);
2492 if (prctl(PR_SET_PDEATHSIG
, SIGKILL
) < 0)
2493 return log_error_errno(errno
, "PR_SET_PDEATHSIG failed: %m");
2496 close_nointr(STDIN_FILENO
);
2497 close_nointr(STDOUT_FILENO
);
2498 close_nointr(STDERR_FILENO
);
2500 r
= open_terminal(console
, O_RDWR
);
2501 if (r
!= STDIN_FILENO
) {
2507 return log_error_errno(r
, "Failed to open console: %m");
2510 if (dup2(STDIN_FILENO
, STDOUT_FILENO
) != STDOUT_FILENO
||
2511 dup2(STDIN_FILENO
, STDERR_FILENO
) != STDERR_FILENO
)
2512 return log_error_errno(errno
, "Failed to duplicate console: %m");
2515 r
= reset_audit_loginuid();
2519 /* Mark everything as slave, so that we still
2520 * receive mounts from the real root, but don't
2521 * propagate mounts to the real root. */
2522 r
= mount_verbose(LOG_ERR
, NULL
, "/", NULL
, MS_SLAVE
|MS_REC
, NULL
);
2526 if (dissected_image
) {
2527 r
= dissected_image_mount(dissected_image
, directory
, DISSECT_IMAGE_DISCARD_ON_LOOP
|(arg_read_only
? DISSECT_IMAGE_READ_ONLY
: 0));
2532 r
= determine_uid_shift(directory
);
2536 if (arg_userns_mode
!= USER_NAMESPACE_NO
) {
2537 /* Let the parent know which UID shift we read from the image */
2538 l
= send(uid_shift_socket
, &arg_uid_shift
, sizeof(arg_uid_shift
), MSG_NOSIGNAL
);
2540 return log_error_errno(errno
, "Failed to send UID shift: %m");
2541 if (l
!= sizeof(arg_uid_shift
)) {
2542 log_error("Short write while sending UID shift.");
2546 if (arg_userns_mode
== USER_NAMESPACE_PICK
) {
2547 /* When we are supposed to pick the UID shift, the parent will check now whether the UID shift
2548 * we just read from the image is available. If yes, it will send the UID shift back to us, if
2549 * not it will pick a different one, and send it back to us. */
2551 l
= recv(uid_shift_socket
, &arg_uid_shift
, sizeof(arg_uid_shift
), 0);
2553 return log_error_errno(errno
, "Failed to recv UID shift: %m");
2554 if (l
!= sizeof(arg_uid_shift
)) {
2555 log_error("Short read while receiving UID shift.");
2560 log_info("Selected user namespace base " UID_FMT
" and range " UID_FMT
".", arg_uid_shift
, arg_uid_range
);
2563 /* Turn directory into bind mount */
2564 r
= mount_verbose(LOG_ERR
, directory
, directory
, NULL
, MS_BIND
|MS_REC
, NULL
);
2568 r
= setup_pivot_root(
2571 arg_pivot_root_old
);
2578 arg_userns_mode
!= USER_NAMESPACE_NO
,
2581 arg_selinux_context
);
2585 r
= setup_volatile_state(
2588 arg_userns_mode
!= USER_NAMESPACE_NO
,
2591 arg_selinux_context
);
2595 /* Mark everything as shared so our mounts get propagated down. This is
2596 * required to make new bind mounts available in systemd services
2597 * inside the containter that create a new mount namespace.
2598 * See https://github.com/systemd/systemd/issues/3860
2599 * Further submounts (such as /dev) done after this will inherit the
2600 * shared propagation mode. */
2601 r
= mount_verbose(LOG_ERR
, NULL
, directory
, NULL
, MS_SHARED
|MS_REC
, NULL
);
2605 r
= recursive_chown(directory
, arg_uid_shift
, arg_uid_range
);
2609 r
= base_filesystem_create(directory
, arg_uid_shift
, (gid_t
) arg_uid_shift
);
2613 if (arg_read_only
) {
2614 r
= bind_remount_recursive(directory
, true, NULL
);
2616 return log_error_errno(r
, "Failed to make tree read-only: %m");
2619 r
= mount_all(directory
,
2623 arg_selinux_apifs_context
);
2627 r
= copy_devnodes(directory
);
2631 dev_setup(directory
, arg_uid_shift
, arg_uid_shift
);
2633 r
= setup_pts(directory
);
2637 r
= setup_propagate(directory
);
2641 r
= setup_dev_console(directory
, console
);
2645 r
= setup_seccomp(arg_caps_retain
, arg_syscall_whitelist
, arg_syscall_blacklist
);
2649 r
= setup_timezone(directory
);
2653 r
= setup_resolv_conf(directory
);
2657 r
= setup_machine_id(directory
);
2661 r
= setup_journal(directory
);
2668 arg_n_custom_mounts
,
2669 arg_userns_mode
!= USER_NAMESPACE_NO
,
2672 arg_selinux_apifs_context
);
2676 if (!arg_use_cgns
|| !cg_ns_supported()) {
2679 arg_unified_cgroup_hierarchy
,
2680 arg_userns_mode
!= USER_NAMESPACE_NO
,
2683 arg_selinux_apifs_context
,
2689 r
= mount_move_root(directory
);
2691 return log_error_errno(r
, "Failed to move root directory: %m");
2693 fd
= setup_sd_notify_child();
2697 pid
= raw_clone(SIGCHLD
|CLONE_NEWNS
|
2698 arg_clone_ns_flags
|
2699 (arg_private_network
? CLONE_NEWNET
: 0) |
2700 (arg_userns_mode
!= USER_NAMESPACE_NO
? CLONE_NEWUSER
: 0));
2702 return log_error_errno(errno
, "Failed to fork inner child: %m");
2704 pid_socket
= safe_close(pid_socket
);
2705 uuid_socket
= safe_close(uuid_socket
);
2706 notify_socket
= safe_close(notify_socket
);
2707 uid_shift_socket
= safe_close(uid_shift_socket
);
2709 /* The inner child has all namespaces that are
2710 * requested, so that we all are owned by the user if
2711 * user namespaces are turned on. */
2713 r
= inner_child(barrier
, directory
, secondary
, kmsg_socket
, rtnl_socket
, fds
);
2715 _exit(EXIT_FAILURE
);
2717 _exit(EXIT_SUCCESS
);
2720 l
= send(pid_socket
, &pid
, sizeof(pid
), MSG_NOSIGNAL
);
2722 return log_error_errno(errno
, "Failed to send PID: %m");
2723 if (l
!= sizeof(pid
)) {
2724 log_error("Short write while sending PID.");
2728 l
= send(uuid_socket
, &arg_uuid
, sizeof(arg_uuid
), MSG_NOSIGNAL
);
2730 return log_error_errno(errno
, "Failed to send machine ID: %m");
2731 if (l
!= sizeof(arg_uuid
)) {
2732 log_error("Short write while sending machine ID.");
2736 l
= send_one_fd(notify_socket
, fd
, 0);
2738 return log_error_errno(errno
, "Failed to send notify fd: %m");
2740 pid_socket
= safe_close(pid_socket
);
2741 uuid_socket
= safe_close(uuid_socket
);
2742 notify_socket
= safe_close(notify_socket
);
2743 kmsg_socket
= safe_close(kmsg_socket
);
2744 rtnl_socket
= safe_close(rtnl_socket
);
2749 static int uid_shift_pick(uid_t
*shift
, LockFile
*ret_lock_file
) {
2750 unsigned n_tries
= 100;
2755 assert(ret_lock_file
);
2756 assert(arg_userns_mode
== USER_NAMESPACE_PICK
);
2757 assert(arg_uid_range
== 0x10000U
);
2761 (void) mkdir("/run/systemd/nspawn-uid", 0755);
2764 char lock_path
[strlen("/run/systemd/nspawn-uid/") + DECIMAL_STR_MAX(uid_t
) + 1];
2765 _cleanup_release_lock_file_ LockFile lf
= LOCK_FILE_INIT
;
2770 if (candidate
< UID_SHIFT_PICK_MIN
|| candidate
> UID_SHIFT_PICK_MAX
)
2772 if ((candidate
& UINT32_C(0xFFFF)) != 0)
2775 xsprintf(lock_path
, "/run/systemd/nspawn-uid/" UID_FMT
, candidate
);
2776 r
= make_lock_file(lock_path
, LOCK_EX
|LOCK_NB
, &lf
);
2777 if (r
== -EBUSY
) /* Range already taken by another nspawn instance */
2782 /* Make some superficial checks whether the range is currently known in the user database */
2783 if (getpwuid(candidate
))
2785 if (getpwuid(candidate
+ UINT32_C(0xFFFE)))
2787 if (getgrgid(candidate
))
2789 if (getgrgid(candidate
+ UINT32_C(0xFFFE)))
2792 *ret_lock_file
= lf
;
2793 lf
= (struct LockFile
) LOCK_FILE_INIT
;
2798 random_bytes(&candidate
, sizeof(candidate
));
2799 candidate
= (candidate
% (UID_SHIFT_PICK_MAX
- UID_SHIFT_PICK_MIN
)) + UID_SHIFT_PICK_MIN
;
2800 candidate
&= (uid_t
) UINT32_C(0xFFFF0000);
2804 static int setup_uid_map(pid_t pid
) {
2805 char uid_map
[strlen("/proc//uid_map") + DECIMAL_STR_MAX(uid_t
) + 1], line
[DECIMAL_STR_MAX(uid_t
)*3+3+1];
2810 xsprintf(uid_map
, "/proc/" PID_FMT
"/uid_map", pid
);
2811 xsprintf(line
, UID_FMT
" " UID_FMT
" " UID_FMT
"\n", 0, arg_uid_shift
, arg_uid_range
);
2812 r
= write_string_file(uid_map
, line
, 0);
2814 return log_error_errno(r
, "Failed to write UID map: %m");
2816 /* We always assign the same UID and GID ranges */
2817 xsprintf(uid_map
, "/proc/" PID_FMT
"/gid_map", pid
);
2818 r
= write_string_file(uid_map
, line
, 0);
2820 return log_error_errno(r
, "Failed to write GID map: %m");
2825 static int nspawn_dispatch_notify_fd(sd_event_source
*source
, int fd
, uint32_t revents
, void *userdata
) {
2826 char buf
[NOTIFY_BUFFER_MAX
+1];
2828 struct iovec iovec
= {
2830 .iov_len
= sizeof(buf
)-1,
2833 struct cmsghdr cmsghdr
;
2834 uint8_t buf
[CMSG_SPACE(sizeof(struct ucred
)) +
2835 CMSG_SPACE(sizeof(int) * NOTIFY_FD_MAX
)];
2837 struct msghdr msghdr
= {
2840 .msg_control
= &control
,
2841 .msg_controllen
= sizeof(control
),
2843 struct cmsghdr
*cmsg
;
2844 struct ucred
*ucred
= NULL
;
2846 pid_t inner_child_pid
;
2847 _cleanup_strv_free_
char **tags
= NULL
;
2851 inner_child_pid
= PTR_TO_PID(userdata
);
2853 if (revents
!= EPOLLIN
) {
2854 log_warning("Got unexpected poll event for notify fd.");
2858 n
= recvmsg(fd
, &msghdr
, MSG_DONTWAIT
|MSG_CMSG_CLOEXEC
);
2860 if (errno
== EAGAIN
|| errno
== EINTR
)
2863 return log_warning_errno(errno
, "Couldn't read notification socket: %m");
2865 cmsg_close_all(&msghdr
);
2867 CMSG_FOREACH(cmsg
, &msghdr
) {
2868 if (cmsg
->cmsg_level
== SOL_SOCKET
&&
2869 cmsg
->cmsg_type
== SCM_CREDENTIALS
&&
2870 cmsg
->cmsg_len
== CMSG_LEN(sizeof(struct ucred
))) {
2872 ucred
= (struct ucred
*) CMSG_DATA(cmsg
);
2876 if (!ucred
|| ucred
->pid
!= inner_child_pid
) {
2877 log_debug("Received notify message without valid credentials. Ignoring.");
2881 if ((size_t) n
>= sizeof(buf
)) {
2882 log_warning("Received notify message exceeded maximum size. Ignoring.");
2887 tags
= strv_split(buf
, "\n\r");
2891 if (strv_find(tags
, "READY=1"))
2892 sd_notifyf(false, "READY=1\n");
2894 p
= strv_find_startswith(tags
, "STATUS=");
2896 sd_notifyf(false, "STATUS=Container running: %s", p
);
2901 static int setup_sd_notify_parent(sd_event
*event
, int fd
, pid_t
*inner_child_pid
, sd_event_source
**notify_event_source
) {
2904 r
= sd_event_add_io(event
, notify_event_source
, fd
, EPOLLIN
, nspawn_dispatch_notify_fd
, inner_child_pid
);
2906 return log_error_errno(r
, "Failed to allocate notify event source: %m");
2908 (void) sd_event_source_set_description(*notify_event_source
, "nspawn-notify");
2913 static int load_settings(void) {
2914 _cleanup_(settings_freep
) Settings
*settings
= NULL
;
2915 _cleanup_fclose_
FILE *f
= NULL
;
2916 _cleanup_free_
char *p
= NULL
;
2920 /* If all settings are masked, there's no point in looking for
2921 * the settings file */
2922 if ((arg_settings_mask
& _SETTINGS_MASK_ALL
) == _SETTINGS_MASK_ALL
)
2925 fn
= strjoina(arg_machine
, ".nspawn");
2927 /* We first look in the admin's directories in /etc and /run */
2928 FOREACH_STRING(i
, "/etc/systemd/nspawn", "/run/systemd/nspawn") {
2929 _cleanup_free_
char *j
= NULL
;
2931 j
= strjoin(i
, "/", fn
);
2940 /* By default, we trust configuration from /etc and /run */
2941 if (arg_settings_trusted
< 0)
2942 arg_settings_trusted
= true;
2947 if (errno
!= ENOENT
)
2948 return log_error_errno(errno
, "Failed to open %s: %m", j
);
2952 /* After that, let's look for a file next to the
2953 * actual image we shall boot. */
2956 p
= file_in_same_dir(arg_image
, fn
);
2959 } else if (arg_directory
) {
2960 p
= file_in_same_dir(arg_directory
, fn
);
2967 if (!f
&& errno
!= ENOENT
)
2968 return log_error_errno(errno
, "Failed to open %s: %m", p
);
2970 /* By default, we do not trust configuration from /var/lib/machines */
2971 if (arg_settings_trusted
< 0)
2972 arg_settings_trusted
= false;
2979 log_debug("Settings are trusted: %s", yes_no(arg_settings_trusted
));
2981 r
= settings_load(f
, p
, &settings
);
2985 /* Copy over bits from the settings, unless they have been
2986 * explicitly masked by command line switches. */
2988 if ((arg_settings_mask
& SETTING_START_MODE
) == 0 &&
2989 settings
->start_mode
>= 0) {
2990 arg_start_mode
= settings
->start_mode
;
2992 strv_free(arg_parameters
);
2993 arg_parameters
= settings
->parameters
;
2994 settings
->parameters
= NULL
;
2997 if ((arg_settings_mask
& SETTING_PIVOT_ROOT
) == 0 &&
2998 settings
->pivot_root_new
) {
2999 free_and_replace(arg_pivot_root_new
, settings
->pivot_root_new
);
3000 free_and_replace(arg_pivot_root_old
, settings
->pivot_root_old
);
3003 if ((arg_settings_mask
& SETTING_WORKING_DIRECTORY
) == 0 &&
3004 settings
->working_directory
) {
3006 arg_chdir
= settings
->working_directory
;
3007 settings
->working_directory
= NULL
;
3010 if ((arg_settings_mask
& SETTING_ENVIRONMENT
) == 0 &&
3011 settings
->environment
) {
3012 strv_free(arg_setenv
);
3013 arg_setenv
= settings
->environment
;
3014 settings
->environment
= NULL
;
3017 if ((arg_settings_mask
& SETTING_USER
) == 0 &&
3020 arg_user
= settings
->user
;
3021 settings
->user
= NULL
;
3024 if ((arg_settings_mask
& SETTING_CAPABILITY
) == 0) {
3027 plus
= settings
->capability
;
3028 if (settings_private_network(settings
))
3029 plus
|= (1ULL << CAP_NET_ADMIN
);
3031 if (!arg_settings_trusted
&& plus
!= 0) {
3032 if (settings
->capability
!= 0)
3033 log_warning("Ignoring Capability= setting, file %s is not trusted.", p
);
3035 arg_caps_retain
|= plus
;
3037 arg_caps_retain
&= ~settings
->drop_capability
;
3040 if ((arg_settings_mask
& SETTING_KILL_SIGNAL
) == 0 &&
3041 settings
->kill_signal
> 0)
3042 arg_kill_signal
= settings
->kill_signal
;
3044 if ((arg_settings_mask
& SETTING_PERSONALITY
) == 0 &&
3045 settings
->personality
!= PERSONALITY_INVALID
)
3046 arg_personality
= settings
->personality
;
3048 if ((arg_settings_mask
& SETTING_MACHINE_ID
) == 0 &&
3049 !sd_id128_is_null(settings
->machine_id
)) {
3051 if (!arg_settings_trusted
)
3052 log_warning("Ignoring MachineID= setting, file %s is not trusted.", p
);
3054 arg_uuid
= settings
->machine_id
;
3057 if ((arg_settings_mask
& SETTING_READ_ONLY
) == 0 &&
3058 settings
->read_only
>= 0)
3059 arg_read_only
= settings
->read_only
;
3061 if ((arg_settings_mask
& SETTING_VOLATILE_MODE
) == 0 &&
3062 settings
->volatile_mode
!= _VOLATILE_MODE_INVALID
)
3063 arg_volatile_mode
= settings
->volatile_mode
;
3065 if ((arg_settings_mask
& SETTING_CUSTOM_MOUNTS
) == 0 &&
3066 settings
->n_custom_mounts
> 0) {
3068 if (!arg_settings_trusted
)
3069 log_warning("Ignoring TemporaryFileSystem=, Bind= and BindReadOnly= settings, file %s is not trusted.", p
);
3071 custom_mount_free_all(arg_custom_mounts
, arg_n_custom_mounts
);
3072 arg_custom_mounts
= settings
->custom_mounts
;
3073 arg_n_custom_mounts
= settings
->n_custom_mounts
;
3075 settings
->custom_mounts
= NULL
;
3076 settings
->n_custom_mounts
= 0;
3080 if ((arg_settings_mask
& SETTING_NETWORK
) == 0 &&
3081 (settings
->private_network
>= 0 ||
3082 settings
->network_veth
>= 0 ||
3083 settings
->network_bridge
||
3084 settings
->network_zone
||
3085 settings
->network_interfaces
||
3086 settings
->network_macvlan
||
3087 settings
->network_ipvlan
||
3088 settings
->network_veth_extra
)) {
3090 if (!arg_settings_trusted
)
3091 log_warning("Ignoring network settings, file %s is not trusted.", p
);
3093 arg_network_veth
= settings_network_veth(settings
);
3094 arg_private_network
= settings_private_network(settings
);
3096 strv_free(arg_network_interfaces
);
3097 arg_network_interfaces
= settings
->network_interfaces
;
3098 settings
->network_interfaces
= NULL
;
3100 strv_free(arg_network_macvlan
);
3101 arg_network_macvlan
= settings
->network_macvlan
;
3102 settings
->network_macvlan
= NULL
;
3104 strv_free(arg_network_ipvlan
);
3105 arg_network_ipvlan
= settings
->network_ipvlan
;
3106 settings
->network_ipvlan
= NULL
;
3108 strv_free(arg_network_veth_extra
);
3109 arg_network_veth_extra
= settings
->network_veth_extra
;
3110 settings
->network_veth_extra
= NULL
;
3112 free(arg_network_bridge
);
3113 arg_network_bridge
= settings
->network_bridge
;
3114 settings
->network_bridge
= NULL
;
3116 free(arg_network_zone
);
3117 arg_network_zone
= settings
->network_zone
;
3118 settings
->network_zone
= NULL
;
3122 if ((arg_settings_mask
& SETTING_EXPOSE_PORTS
) == 0 &&
3123 settings
->expose_ports
) {
3125 if (!arg_settings_trusted
)
3126 log_warning("Ignoring Port= setting, file %s is not trusted.", p
);
3128 expose_port_free_all(arg_expose_ports
);
3129 arg_expose_ports
= settings
->expose_ports
;
3130 settings
->expose_ports
= NULL
;
3134 if ((arg_settings_mask
& SETTING_USERNS
) == 0 &&
3135 settings
->userns_mode
!= _USER_NAMESPACE_MODE_INVALID
) {
3137 if (!arg_settings_trusted
)
3138 log_warning("Ignoring PrivateUsers= and PrivateUsersChown= settings, file %s is not trusted.", p
);
3140 arg_userns_mode
= settings
->userns_mode
;
3141 arg_uid_shift
= settings
->uid_shift
;
3142 arg_uid_range
= settings
->uid_range
;
3143 arg_userns_chown
= settings
->userns_chown
;
3147 if ((arg_settings_mask
& SETTING_NOTIFY_READY
) == 0)
3148 arg_notify_ready
= settings
->notify_ready
;
3150 if ((arg_settings_mask
& SETTING_SYSCALL_FILTER
) == 0) {
3152 if (!arg_settings_trusted
&& !strv_isempty(arg_syscall_whitelist
))
3153 log_warning("Ignoring SystemCallFilter= settings, file %s is not trusted.", p
);
3155 strv_free(arg_syscall_whitelist
);
3156 strv_free(arg_syscall_blacklist
);
3158 arg_syscall_whitelist
= settings
->syscall_whitelist
;
3159 arg_syscall_blacklist
= settings
->syscall_blacklist
;
3161 settings
->syscall_whitelist
= settings
->syscall_blacklist
= NULL
;
3168 static int run(int master
,
3169 const char* console
,
3170 DissectedImage
*dissected_image
,
3174 char veth_name
[IFNAMSIZ
], bool *veth_created
,
3175 union in_addr_union
*exposed
,
3176 pid_t
*pid
, int *ret
) {
3178 static const struct sigaction sa
= {
3179 .sa_handler
= nop_signal_handler
,
3180 .sa_flags
= SA_NOCLDSTOP
|SA_RESTART
,
3183 _cleanup_release_lock_file_ LockFile uid_shift_lock
= LOCK_FILE_INIT
;
3184 _cleanup_close_
int etc_passwd_lock
= -1;
3185 _cleanup_close_pair_
int
3186 kmsg_socket_pair
[2] = { -1, -1 },
3187 rtnl_socket_pair
[2] = { -1, -1 },
3188 pid_socket_pair
[2] = { -1, -1 },
3189 uuid_socket_pair
[2] = { -1, -1 },
3190 notify_socket_pair
[2] = { -1, -1 },
3191 uid_shift_socket_pair
[2] = { -1, -1 };
3192 _cleanup_close_
int notify_socket
= -1;
3193 _cleanup_(barrier_destroy
) Barrier barrier
= BARRIER_NULL
;
3194 _cleanup_(sd_event_source_unrefp
) sd_event_source
*notify_event_source
= NULL
;
3195 _cleanup_(sd_event_unrefp
) sd_event
*event
= NULL
;
3196 _cleanup_(pty_forward_freep
) PTYForward
*forward
= NULL
;
3197 _cleanup_(sd_netlink_unrefp
) sd_netlink
*rtnl
= NULL
;
3198 ContainerStatus container_status
= 0;
3204 assert_se(sigemptyset(&mask_chld
) == 0);
3205 assert_se(sigaddset(&mask_chld
, SIGCHLD
) == 0);
3207 if (arg_userns_mode
== USER_NAMESPACE_PICK
) {
3208 /* When we shall pick the UID/GID range, let's first lock /etc/passwd, so that we can safely
3209 * check with getpwuid() if the specific user already exists. Note that /etc might be
3210 * read-only, in which case this will fail with EROFS. But that's really OK, as in that case we
3211 * can be reasonably sure that no users are going to be added. Note that getpwuid() checks are
3212 * really just an extra safety net. We kinda assume that the UID range we allocate from is
3215 etc_passwd_lock
= take_etc_passwd_lock(NULL
);
3216 if (etc_passwd_lock
< 0 && etc_passwd_lock
!= -EROFS
)
3217 return log_error_errno(etc_passwd_lock
, "Failed to take /etc/passwd lock: %m");
3220 r
= barrier_create(&barrier
);
3222 return log_error_errno(r
, "Cannot initialize IPC barrier: %m");
3224 if (socketpair(AF_UNIX
, SOCK_SEQPACKET
|SOCK_CLOEXEC
, 0, kmsg_socket_pair
) < 0)
3225 return log_error_errno(errno
, "Failed to create kmsg socket pair: %m");
3227 if (socketpair(AF_UNIX
, SOCK_SEQPACKET
|SOCK_CLOEXEC
, 0, rtnl_socket_pair
) < 0)
3228 return log_error_errno(errno
, "Failed to create rtnl socket pair: %m");
3230 if (socketpair(AF_UNIX
, SOCK_SEQPACKET
|SOCK_CLOEXEC
, 0, pid_socket_pair
) < 0)
3231 return log_error_errno(errno
, "Failed to create pid socket pair: %m");
3233 if (socketpair(AF_UNIX
, SOCK_SEQPACKET
|SOCK_CLOEXEC
, 0, uuid_socket_pair
) < 0)
3234 return log_error_errno(errno
, "Failed to create id socket pair: %m");
3236 if (socketpair(AF_UNIX
, SOCK_SEQPACKET
|SOCK_CLOEXEC
, 0, notify_socket_pair
) < 0)
3237 return log_error_errno(errno
, "Failed to create notify socket pair: %m");
3239 if (arg_userns_mode
!= USER_NAMESPACE_NO
)
3240 if (socketpair(AF_UNIX
, SOCK_SEQPACKET
|SOCK_CLOEXEC
, 0, uid_shift_socket_pair
) < 0)
3241 return log_error_errno(errno
, "Failed to create uid shift socket pair: %m");
3243 /* Child can be killed before execv(), so handle SIGCHLD in order to interrupt
3244 * parent's blocking calls and give it a chance to call wait() and terminate. */
3245 r
= sigprocmask(SIG_UNBLOCK
, &mask_chld
, NULL
);
3247 return log_error_errno(errno
, "Failed to change the signal mask: %m");
3249 r
= sigaction(SIGCHLD
, &sa
, NULL
);
3251 return log_error_errno(errno
, "Failed to install SIGCHLD handler: %m");
3253 *pid
= raw_clone(SIGCHLD
|CLONE_NEWNS
);
3255 return log_error_errno(errno
, "clone() failed%s: %m",
3257 ", do you have namespace support enabled in your kernel? (You need UTS, IPC, PID and NET namespacing built in)" : "");
3260 /* The outer child only has a file system namespace. */
3261 barrier_set_role(&barrier
, BARRIER_CHILD
);
3263 master
= safe_close(master
);
3265 kmsg_socket_pair
[0] = safe_close(kmsg_socket_pair
[0]);
3266 rtnl_socket_pair
[0] = safe_close(rtnl_socket_pair
[0]);
3267 pid_socket_pair
[0] = safe_close(pid_socket_pair
[0]);
3268 uuid_socket_pair
[0] = safe_close(uuid_socket_pair
[0]);
3269 notify_socket_pair
[0] = safe_close(notify_socket_pair
[0]);
3270 uid_shift_socket_pair
[0] = safe_close(uid_shift_socket_pair
[0]);
3272 (void) reset_all_signal_handlers();
3273 (void) reset_signal_mask();
3275 r
= outer_child(&barrier
,
3282 uuid_socket_pair
[1],
3283 notify_socket_pair
[1],
3284 kmsg_socket_pair
[1],
3285 rtnl_socket_pair
[1],
3286 uid_shift_socket_pair
[1],
3289 _exit(EXIT_FAILURE
);
3291 _exit(EXIT_SUCCESS
);
3294 barrier_set_role(&barrier
, BARRIER_PARENT
);
3296 fds
= fdset_free(fds
);
3298 kmsg_socket_pair
[1] = safe_close(kmsg_socket_pair
[1]);
3299 rtnl_socket_pair
[1] = safe_close(rtnl_socket_pair
[1]);
3300 pid_socket_pair
[1] = safe_close(pid_socket_pair
[1]);
3301 uuid_socket_pair
[1] = safe_close(uuid_socket_pair
[1]);
3302 notify_socket_pair
[1] = safe_close(notify_socket_pair
[1]);
3303 uid_shift_socket_pair
[1] = safe_close(uid_shift_socket_pair
[1]);
3305 if (arg_userns_mode
!= USER_NAMESPACE_NO
) {
3306 /* The child just let us know the UID shift it might have read from the image. */
3307 l
= recv(uid_shift_socket_pair
[0], &arg_uid_shift
, sizeof arg_uid_shift
, 0);
3309 return log_error_errno(errno
, "Failed to read UID shift: %m");
3310 if (l
!= sizeof arg_uid_shift
) {
3311 log_error("Short read while reading UID shift.");
3315 if (arg_userns_mode
== USER_NAMESPACE_PICK
) {
3316 /* If we are supposed to pick the UID shift, let's try to use the shift read from the
3317 * image, but if that's already in use, pick a new one, and report back to the child,
3318 * which one we now picked. */
3320 r
= uid_shift_pick(&arg_uid_shift
, &uid_shift_lock
);
3322 return log_error_errno(r
, "Failed to pick suitable UID/GID range: %m");
3324 l
= send(uid_shift_socket_pair
[0], &arg_uid_shift
, sizeof arg_uid_shift
, MSG_NOSIGNAL
);
3326 return log_error_errno(errno
, "Failed to send UID shift: %m");
3327 if (l
!= sizeof arg_uid_shift
) {
3328 log_error("Short write while writing UID shift.");
3334 /* Wait for the outer child. */
3335 r
= wait_for_terminate_and_warn("namespace helper", *pid
, NULL
);
3337 return r
< 0 ? r
: -EIO
;
3339 /* And now retrieve the PID of the inner child. */
3340 l
= recv(pid_socket_pair
[0], pid
, sizeof *pid
, 0);
3342 return log_error_errno(errno
, "Failed to read inner child PID: %m");
3343 if (l
!= sizeof *pid
) {
3344 log_error("Short read while reading inner child PID.");
3348 /* We also retrieve container UUID in case it was generated by outer child */
3349 l
= recv(uuid_socket_pair
[0], &arg_uuid
, sizeof arg_uuid
, 0);
3351 return log_error_errno(errno
, "Failed to read container machine ID: %m");
3352 if (l
!= sizeof(arg_uuid
)) {
3353 log_error("Short read while reading container machined ID.");
3357 /* We also retrieve the socket used for notifications generated by outer child */
3358 notify_socket
= receive_one_fd(notify_socket_pair
[0], 0);
3359 if (notify_socket
< 0)
3360 return log_error_errno(notify_socket
,
3361 "Failed to receive notification socket from the outer child: %m");
3363 log_debug("Init process invoked as PID "PID_FMT
, *pid
);
3365 if (arg_userns_mode
!= USER_NAMESPACE_NO
) {
3366 if (!barrier_place_and_sync(&barrier
)) { /* #1 */
3367 log_error("Child died too early.");
3371 r
= setup_uid_map(*pid
);
3375 (void) barrier_place(&barrier
); /* #2 */
3378 if (arg_private_network
) {
3380 r
= move_network_interfaces(*pid
, arg_network_interfaces
);
3384 if (arg_network_veth
) {
3385 r
= setup_veth(arg_machine
, *pid
, veth_name
,
3386 arg_network_bridge
|| arg_network_zone
);
3392 if (arg_network_bridge
) {
3393 /* Add the interface to a bridge */
3394 r
= setup_bridge(veth_name
, arg_network_bridge
, false);
3399 } else if (arg_network_zone
) {
3400 /* Add the interface to a bridge, possibly creating it */
3401 r
= setup_bridge(veth_name
, arg_network_zone
, true);
3409 r
= setup_veth_extra(arg_machine
, *pid
, arg_network_veth_extra
);
3413 /* We created the primary and extra veth links now; let's remember this, so that we know to
3414 remove them later on. Note that we don't bother with removing veth links that were created
3415 here when their setup failed half-way, because in that case the kernel should be able to
3416 remove them on its own, since they cannot be referenced by anything yet. */
3417 *veth_created
= true;
3419 r
= setup_macvlan(arg_machine
, *pid
, arg_network_macvlan
);
3423 r
= setup_ipvlan(arg_machine
, *pid
, arg_network_ipvlan
);
3429 r
= register_machine(
3436 arg_custom_mounts
, arg_n_custom_mounts
,
3440 arg_container_service_name
);
3443 } else if (!arg_keep_unit
) {
3448 arg_custom_mounts
, arg_n_custom_mounts
,
3454 } else if (arg_slice
|| arg_property
)
3455 log_notice("Machine and scope registration turned off, --slice= and --property= settings will have no effect.");
3457 r
= sync_cgroup(*pid
, arg_unified_cgroup_hierarchy
, arg_uid_shift
);
3461 if (arg_keep_unit
) {
3462 r
= create_subcgroup(*pid
, arg_unified_cgroup_hierarchy
);
3467 r
= chown_cgroup(*pid
, arg_uid_shift
);
3471 /* Notify the child that the parent is ready with all
3472 * its setup (including cgroup-ification), and that
3473 * the child can now hand over control to the code to
3474 * run inside the container. */
3475 (void) barrier_place(&barrier
); /* #3 */
3477 /* Block SIGCHLD here, before notifying child.
3478 * process_pty() will handle it with the other signals. */
3479 assert_se(sigprocmask(SIG_BLOCK
, &mask_chld
, NULL
) >= 0);
3481 /* Reset signal to default */
3482 r
= default_signals(SIGCHLD
, -1);
3484 return log_error_errno(r
, "Failed to reset SIGCHLD: %m");
3486 r
= sd_event_new(&event
);
3488 return log_error_errno(r
, "Failed to get default event source: %m");
3490 r
= setup_sd_notify_parent(event
, notify_socket
, PID_TO_PTR(*pid
), ¬ify_event_source
);
3494 /* Let the child know that we are ready and wait that the child is completely ready now. */
3495 if (!barrier_place_and_sync(&barrier
)) { /* #4 */
3496 log_error("Child died too early.");
3500 /* At this point we have made use of the UID we picked, and thus nss-mymachines
3501 * will make them appear in getpwuid(), thus we can release the /etc/passwd lock. */
3502 etc_passwd_lock
= safe_close(etc_passwd_lock
);
3505 "STATUS=Container running.\n"
3506 "X_NSPAWN_LEADER_PID=" PID_FMT
, *pid
);
3507 if (!arg_notify_ready
)
3508 sd_notify(false, "READY=1\n");
3510 if (arg_kill_signal
> 0) {
3511 /* Try to kill the init system on SIGINT or SIGTERM */
3512 sd_event_add_signal(event
, NULL
, SIGINT
, on_orderly_shutdown
, PID_TO_PTR(*pid
));
3513 sd_event_add_signal(event
, NULL
, SIGTERM
, on_orderly_shutdown
, PID_TO_PTR(*pid
));
3515 /* Immediately exit */
3516 sd_event_add_signal(event
, NULL
, SIGINT
, NULL
, NULL
);
3517 sd_event_add_signal(event
, NULL
, SIGTERM
, NULL
, NULL
);
3520 /* Exit when the child exits */
3521 sd_event_add_signal(event
, NULL
, SIGCHLD
, on_sigchld
, PID_TO_PTR(*pid
));
3523 if (arg_expose_ports
) {
3524 r
= expose_port_watch_rtnl(event
, rtnl_socket_pair
[0], on_address_change
, exposed
, &rtnl
);
3528 (void) expose_port_execute(rtnl
, arg_expose_ports
, exposed
);
3531 rtnl_socket_pair
[0] = safe_close(rtnl_socket_pair
[0]);
3533 r
= pty_forward_new(event
, master
,
3534 PTY_FORWARD_IGNORE_VHANGUP
| (interactive
? 0 : PTY_FORWARD_READ_ONLY
),
3537 return log_error_errno(r
, "Failed to create PTY forwarder: %m");
3539 r
= sd_event_loop(event
);
3541 return log_error_errno(r
, "Failed to run event loop: %m");
3543 pty_forward_get_last_char(forward
, &last_char
);
3545 forward
= pty_forward_free(forward
);
3547 if (!arg_quiet
&& last_char
!= '\n')
3550 /* Kill if it is not dead yet anyway */
3551 if (arg_register
&& !arg_keep_unit
)
3552 terminate_machine(*pid
);
3554 /* Normally redundant, but better safe than sorry */
3555 (void) kill(*pid
, SIGKILL
);
3557 r
= wait_for_container(*pid
, &container_status
);
3561 /* We failed to wait for the container, or the container exited abnormally. */
3563 if (r
> 0 || container_status
== CONTAINER_TERMINATED
) {
3564 /* r > 0 → The container exited with a non-zero status.
3565 * As a special case, we need to replace 133 with a different value,
3566 * because 133 is special-cased in the service file to reboot the container.
3567 * otherwise → The container exited with zero status and a reboot was not requested.
3569 if (r
== EXIT_FORCE_RESTART
)
3570 r
= EXIT_FAILURE
; /* replace 133 with the general failure code */
3572 return 0; /* finito */
3575 /* CONTAINER_REBOOTED, loop again */
3577 if (arg_keep_unit
) {
3578 /* Special handling if we are running as a service: instead of simply
3579 * restarting the machine we want to restart the entire service, so let's
3580 * inform systemd about this with the special exit code 133. The service
3581 * file uses RestartForceExitStatus=133 so that this results in a full
3582 * nspawn restart. This is necessary since we might have cgroup parameters
3583 * set we want to have flushed out. */
3584 *ret
= EXIT_FORCE_RESTART
;
3585 return 0; /* finito */
3588 expose_port_flush(arg_expose_ports
, exposed
);
3590 (void) remove_veth_links(veth_name
, arg_network_veth_extra
);
3591 *veth_created
= false;
3592 return 1; /* loop again */
3595 int main(int argc
, char *argv
[]) {
3597 _cleanup_free_
char *console
= NULL
;
3598 _cleanup_close_
int master
= -1;
3599 _cleanup_fdset_free_ FDSet
*fds
= NULL
;
3600 int r
, n_fd_passed
, ret
= EXIT_SUCCESS
;
3601 char veth_name
[IFNAMSIZ
] = "";
3602 bool secondary
= false, remove_directory
= false, remove_image
= false;
3604 union in_addr_union exposed
= {};
3605 _cleanup_release_lock_file_ LockFile tree_global_lock
= LOCK_FILE_INIT
, tree_local_lock
= LOCK_FILE_INIT
;
3606 bool interactive
, veth_created
= false, remove_tmprootdir
= false;
3607 char tmprootdir
[] = "/tmp/nspawn-root-XXXXXX";
3608 _cleanup_(loop_device_unrefp
) LoopDevice
*loop
= NULL
;
3609 _cleanup_(decrypted_image_unrefp
) DecryptedImage
*decrypted_image
= NULL
;
3610 _cleanup_(dissected_image_unrefp
) DissectedImage
*dissected_image
= NULL
;
3612 log_parse_environment();
3615 /* Make sure rename_process() in the stub init process can work */
3619 r
= parse_argv(argc
, argv
);
3623 if (geteuid() != 0) {
3624 log_error("Need to be root.");
3628 r
= determine_names();
3632 r
= load_settings();
3636 r
= verify_arguments();
3640 n_fd_passed
= sd_listen_fds(false);
3641 if (n_fd_passed
> 0) {
3642 r
= fdset_new_listen_fds(&fds
, false);
3644 log_error_errno(r
, "Failed to collect file descriptors: %m");
3649 if (arg_directory
) {
3652 if (path_equal(arg_directory
, "/") && !arg_ephemeral
) {
3653 log_error("Spawning container on root directory is not supported. Consider using --ephemeral.");
3658 if (arg_ephemeral
) {
3659 _cleanup_free_
char *np
= NULL
;
3661 r
= chase_symlinks_and_update(&arg_directory
, 0);
3665 /* If the specified path is a mount point we
3666 * generate the new snapshot immediately
3667 * inside it under a random name. However if
3668 * the specified is not a mount point we
3669 * create the new snapshot in the parent
3670 * directory, just next to it. */
3671 r
= path_is_mount_point(arg_directory
, NULL
, 0);
3673 log_error_errno(r
, "Failed to determine whether directory %s is mount point: %m", arg_directory
);
3677 r
= tempfn_random_child(arg_directory
, "machine.", &np
);
3679 r
= tempfn_random(arg_directory
, "machine.", &np
);
3681 log_error_errno(r
, "Failed to generate name for directory snapshot: %m");
3685 r
= image_path_lock(np
, (arg_read_only
? LOCK_SH
: LOCK_EX
) | LOCK_NB
, &tree_global_lock
, &tree_local_lock
);
3687 log_error_errno(r
, "Failed to lock %s: %m", np
);
3691 r
= btrfs_subvol_snapshot(arg_directory
, np
,
3692 (arg_read_only
? BTRFS_SNAPSHOT_READ_ONLY
: 0) |
3693 BTRFS_SNAPSHOT_FALLBACK_COPY
|
3694 BTRFS_SNAPSHOT_FALLBACK_DIRECTORY
|
3695 BTRFS_SNAPSHOT_RECURSIVE
|
3696 BTRFS_SNAPSHOT_QUOTA
);
3698 log_error_errno(r
, "Failed to create snapshot %s from %s: %m", np
, arg_directory
);
3702 free(arg_directory
);
3706 remove_directory
= true;
3709 r
= chase_symlinks_and_update(&arg_directory
, arg_template
? CHASE_NONEXISTENT
: 0);
3713 r
= image_path_lock(arg_directory
, (arg_read_only
? LOCK_SH
: LOCK_EX
) | LOCK_NB
, &tree_global_lock
, &tree_local_lock
);
3715 log_error_errno(r
, "Directory tree %s is currently busy.", arg_directory
);
3719 log_error_errno(r
, "Failed to lock %s: %m", arg_directory
);
3724 r
= chase_symlinks_and_update(&arg_template
, 0);
3728 r
= btrfs_subvol_snapshot(arg_template
, arg_directory
,
3729 (arg_read_only
? BTRFS_SNAPSHOT_READ_ONLY
: 0) |
3730 BTRFS_SNAPSHOT_FALLBACK_COPY
|
3731 BTRFS_SNAPSHOT_FALLBACK_DIRECTORY
|
3732 BTRFS_SNAPSHOT_FALLBACK_IMMUTABLE
|
3733 BTRFS_SNAPSHOT_RECURSIVE
|
3734 BTRFS_SNAPSHOT_QUOTA
);
3737 log_info("Directory %s already exists, not populating from template %s.", arg_directory
, arg_template
);
3739 log_error_errno(r
, "Couldn't create snapshot %s from %s: %m", arg_directory
, arg_template
);
3743 log_info("Populated %s from template %s.", arg_directory
, arg_template
);
3748 if (arg_start_mode
== START_BOOT
) {
3749 if (path_is_os_tree(arg_directory
) <= 0) {
3750 log_error("Directory %s doesn't look like an OS root directory (os-release file is missing). Refusing.", arg_directory
);
3757 p
= strjoina(arg_directory
, "/usr/");
3758 if (laccess(p
, F_OK
) < 0) {
3759 log_error("Directory %s doesn't look like it has an OS tree. Refusing.", arg_directory
);
3767 assert(!arg_template
);
3769 r
= chase_symlinks_and_update(&arg_image
, 0);
3773 if (arg_ephemeral
) {
3774 _cleanup_free_
char *np
= NULL
;
3776 r
= tempfn_random(arg_image
, "machine.", &np
);
3778 log_error_errno(r
, "Failed to generate name for image snapshot: %m");
3782 r
= image_path_lock(np
, (arg_read_only
? LOCK_SH
: LOCK_EX
) | LOCK_NB
, &tree_global_lock
, &tree_local_lock
);
3784 r
= log_error_errno(r
, "Failed to create image lock: %m");
3788 r
= copy_file(arg_image
, np
, O_EXCL
, arg_read_only
? 0400 : 0600, FS_NOCOW_FL
, COPY_REFLINK
);
3790 r
= log_error_errno(r
, "Failed to copy image file: %m");
3798 remove_image
= true;
3800 r
= image_path_lock(arg_image
, (arg_read_only
? LOCK_SH
: LOCK_EX
) | LOCK_NB
, &tree_global_lock
, &tree_local_lock
);
3802 r
= log_error_errno(r
, "Disk image %s is currently busy.", arg_image
);
3806 r
= log_error_errno(r
, "Failed to create image lock: %m");
3810 if (!arg_root_hash
) {
3811 r
= root_hash_load(arg_image
, &arg_root_hash
, &arg_root_hash_size
);
3813 log_error_errno(r
, "Failed to load root hash file for %s: %m", arg_image
);
3819 if (!mkdtemp(tmprootdir
)) {
3820 r
= log_error_errno(errno
, "Failed to create temporary directory: %m");
3824 remove_tmprootdir
= true;
3826 arg_directory
= strdup(tmprootdir
);
3827 if (!arg_directory
) {
3832 r
= loop_device_make_by_path(arg_image
, arg_read_only
? O_RDONLY
: O_RDWR
, &loop
);
3834 log_error_errno(r
, "Failed to set up loopback block device: %m");
3840 arg_root_hash
, arg_root_hash_size
,
3841 DISSECT_IMAGE_REQUIRE_ROOT
,
3844 log_error_errno(r
, "Could not find a suitable file system or partition table in image: %s", arg_image
);
3846 log_notice("Note that the disk image needs to\n"
3847 " a) either contain only a single MBR partition of type 0x83 that is marked bootable\n"
3848 " b) or contain a single GPT partition of type 0FC63DAF-8483-4772-8E79-3D69D8477DE4\n"
3849 " c) or follow http://www.freedesktop.org/wiki/Specifications/DiscoverablePartitionsSpec/\n"
3850 " d) or contain a file system without a partition table\n"
3851 "in order to be bootable with systemd-nspawn.");
3854 if (r
== -EADDRNOTAVAIL
) {
3855 log_error_errno(r
, "No root partition for specified root hash found.");
3858 if (r
== -EOPNOTSUPP
) {
3859 log_error_errno(r
, "--image= is not supported, compiled without blkid support.");
3863 log_error_errno(r
, "Failed to dissect image: %m");
3867 if (!arg_root_hash
&& dissected_image
->can_verity
)
3868 log_notice("Note: image %s contains verity information, but no root hash specified! Proceeding without integrity checking.", arg_image
);
3870 r
= dissected_image_decrypt_interactively(dissected_image
, NULL
, arg_root_hash
, arg_root_hash_size
, 0, &decrypted_image
);
3874 /* Now that we mounted the image, let's try to remove it again, if it is ephemeral */
3875 if (remove_image
&& unlink(arg_image
) >= 0)
3876 remove_image
= false;
3879 r
= custom_mount_prepare_all(arg_directory
, arg_custom_mounts
, arg_n_custom_mounts
);
3883 r
= detect_unified_cgroup_hierarchy(arg_directory
);
3888 isatty(STDIN_FILENO
) > 0 &&
3889 isatty(STDOUT_FILENO
) > 0;
3891 master
= posix_openpt(O_RDWR
|O_NOCTTY
|O_CLOEXEC
|O_NDELAY
);
3893 r
= log_error_errno(errno
, "Failed to acquire pseudo tty: %m");
3897 r
= ptsname_malloc(master
, &console
);
3899 r
= log_error_errno(r
, "Failed to determine tty name: %m");
3903 if (arg_selinux_apifs_context
) {
3904 r
= mac_selinux_apply(console
, arg_selinux_apifs_context
);
3909 if (unlockpt(master
) < 0) {
3910 r
= log_error_errno(errno
, "Failed to unlock tty: %m");
3915 log_info("Spawning container %s on %s.\nPress ^] three times within 1s to kill container.",
3916 arg_machine
, arg_image
?: arg_directory
);
3918 assert_se(sigprocmask_many(SIG_BLOCK
, NULL
, SIGCHLD
, SIGWINCH
, SIGTERM
, SIGINT
, -1) >= 0);
3920 if (prctl(PR_SET_CHILD_SUBREAPER
, 1) < 0) {
3921 r
= log_error_errno(errno
, "Failed to become subreaper: %m");
3929 interactive
, secondary
,
3931 veth_name
, &veth_created
,
3940 r
== 0 && ret
== EXIT_FORCE_RESTART
? "STOPPING=1\nSTATUS=Restarting..." :
3941 "STOPPING=1\nSTATUS=Terminating...");
3944 (void) kill(pid
, SIGKILL
);
3946 /* Try to flush whatever is still queued in the pty */
3948 (void) copy_bytes(master
, STDOUT_FILENO
, (uint64_t) -1, 0);
3949 master
= safe_close(master
);
3953 (void) wait_for_terminate(pid
, NULL
);
3955 if (remove_directory
&& arg_directory
) {
3958 k
= rm_rf(arg_directory
, REMOVE_ROOT
|REMOVE_PHYSICAL
|REMOVE_SUBVOLUME
);
3960 log_warning_errno(k
, "Cannot remove '%s', ignoring: %m", arg_directory
);
3963 if (remove_image
&& arg_image
) {
3964 if (unlink(arg_image
) < 0)
3965 log_warning_errno(errno
, "Can't remove image file '%s', ignoring: %m", arg_image
);
3968 if (remove_tmprootdir
) {
3969 if (rmdir(tmprootdir
) < 0)
3970 log_debug_errno(errno
, "Can't remove temporary root directory '%s', ignoring: %m", tmprootdir
);
3976 p
= strjoina("/run/systemd/nspawn/propagate/", arg_machine
);
3977 (void) rm_rf(p
, REMOVE_ROOT
);
3980 expose_port_flush(arg_expose_ports
, &exposed
);
3983 (void) remove_veth_links(veth_name
, arg_network_veth_extra
);
3984 (void) remove_bridge(arg_network_zone
);
3986 free(arg_directory
);
3991 free(arg_pivot_root_new
);
3992 free(arg_pivot_root_old
);
3994 strv_free(arg_setenv
);
3995 free(arg_network_bridge
);
3996 strv_free(arg_network_interfaces
);
3997 strv_free(arg_network_macvlan
);
3998 strv_free(arg_network_ipvlan
);
3999 strv_free(arg_network_veth_extra
);
4000 strv_free(arg_parameters
);
4001 custom_mount_free_all(arg_custom_mounts
, arg_n_custom_mounts
);
4002 expose_port_free_all(arg_expose_ports
);
4003 free(arg_root_hash
);
4005 return r
< 0 ? EXIT_FAILURE
: ret
;