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-def.h"
81 #include "nspawn-expose-ports.h"
82 #include "nspawn-mount.h"
83 #include "nspawn-network.h"
84 #include "nspawn-patch-uid.h"
85 #include "nspawn-register.h"
86 #include "nspawn-seccomp.h"
87 #include "nspawn-settings.h"
88 #include "nspawn-setuid.h"
89 #include "nspawn-stub-pid1.h"
90 #include "parse-util.h"
91 #include "path-util.h"
92 #include "process-util.h"
94 #include "random-util.h"
95 #include "raw-clone.h"
97 #include "selinux-util.h"
98 #include "signal-util.h"
99 #include "socket-util.h"
100 #include "stat-util.h"
101 #include "stdio-util.h"
102 #include "string-util.h"
104 #include "terminal-util.h"
105 #include "udev-util.h"
106 #include "umask-util.h"
107 #include "user-util.h"
110 /* nspawn is listening on the socket at the path in the constant nspawn_notify_socket_path
111 * nspawn_notify_socket_path is relative to the container
112 * the init process in the container pid can send messages to nspawn following the sd_notify(3) protocol */
113 #define NSPAWN_NOTIFY_SOCKET_PATH "/run/systemd/nspawn/notify"
115 #define EXIT_FORCE_RESTART 133
117 typedef enum ContainerStatus
{
118 CONTAINER_TERMINATED
,
122 typedef enum LinkJournal
{
129 static char *arg_directory
= NULL
;
130 static char *arg_template
= NULL
;
131 static char *arg_chdir
= NULL
;
132 static char *arg_pivot_root_new
= NULL
;
133 static char *arg_pivot_root_old
= NULL
;
134 static char *arg_user
= NULL
;
135 static sd_id128_t arg_uuid
= {};
136 static char *arg_machine
= NULL
;
137 static const char *arg_selinux_context
= NULL
;
138 static const char *arg_selinux_apifs_context
= NULL
;
139 static const char *arg_slice
= NULL
;
140 static bool arg_private_network
= false;
141 static bool arg_read_only
= false;
142 static StartMode arg_start_mode
= START_PID1
;
143 static bool arg_ephemeral
= false;
144 static LinkJournal arg_link_journal
= LINK_AUTO
;
145 static bool arg_link_journal_try
= false;
146 static uint64_t arg_caps_retain
=
147 (1ULL << CAP_AUDIT_CONTROL
) |
148 (1ULL << CAP_AUDIT_WRITE
) |
149 (1ULL << CAP_CHOWN
) |
150 (1ULL << CAP_DAC_OVERRIDE
) |
151 (1ULL << CAP_DAC_READ_SEARCH
) |
152 (1ULL << CAP_FOWNER
) |
153 (1ULL << CAP_FSETID
) |
154 (1ULL << CAP_IPC_OWNER
) |
156 (1ULL << CAP_LEASE
) |
157 (1ULL << CAP_LINUX_IMMUTABLE
) |
158 (1ULL << CAP_MKNOD
) |
159 (1ULL << CAP_NET_BIND_SERVICE
) |
160 (1ULL << CAP_NET_BROADCAST
) |
161 (1ULL << CAP_NET_RAW
) |
162 (1ULL << CAP_SETFCAP
) |
163 (1ULL << CAP_SETGID
) |
164 (1ULL << CAP_SETPCAP
) |
165 (1ULL << CAP_SETUID
) |
166 (1ULL << CAP_SYS_ADMIN
) |
167 (1ULL << CAP_SYS_BOOT
) |
168 (1ULL << CAP_SYS_CHROOT
) |
169 (1ULL << CAP_SYS_NICE
) |
170 (1ULL << CAP_SYS_PTRACE
) |
171 (1ULL << CAP_SYS_RESOURCE
) |
172 (1ULL << CAP_SYS_TTY_CONFIG
);
173 static CustomMount
*arg_custom_mounts
= NULL
;
174 static unsigned arg_n_custom_mounts
= 0;
175 static char **arg_setenv
= NULL
;
176 static bool arg_quiet
= false;
177 static bool arg_register
= true;
178 static bool arg_keep_unit
= false;
179 static char **arg_network_interfaces
= NULL
;
180 static char **arg_network_macvlan
= NULL
;
181 static char **arg_network_ipvlan
= NULL
;
182 static bool arg_network_veth
= false;
183 static char **arg_network_veth_extra
= NULL
;
184 static char *arg_network_bridge
= NULL
;
185 static char *arg_network_zone
= NULL
;
186 static unsigned long arg_personality
= PERSONALITY_INVALID
;
187 static char *arg_image
= NULL
;
188 static VolatileMode arg_volatile_mode
= VOLATILE_NO
;
189 static ExposePort
*arg_expose_ports
= NULL
;
190 static char **arg_property
= NULL
;
191 static UserNamespaceMode arg_userns_mode
= USER_NAMESPACE_NO
;
192 static uid_t arg_uid_shift
= UID_INVALID
, arg_uid_range
= 0x10000U
;
193 static bool arg_userns_chown
= false;
194 static int arg_kill_signal
= 0;
195 static CGroupUnified arg_unified_cgroup_hierarchy
= CGROUP_UNIFIED_UNKNOWN
;
196 static SettingsMask arg_settings_mask
= 0;
197 static int arg_settings_trusted
= -1;
198 static char **arg_parameters
= NULL
;
199 static const char *arg_container_service_name
= "systemd-nspawn";
200 static bool arg_notify_ready
= false;
201 static bool arg_use_cgns
= true;
202 static unsigned long arg_clone_ns_flags
= CLONE_NEWIPC
|CLONE_NEWPID
|CLONE_NEWUTS
;
203 static MountSettingsMask arg_mount_settings
= MOUNT_APPLY_APIVFS_RO
;
204 static void *arg_root_hash
= NULL
;
205 static size_t arg_root_hash_size
= 0;
206 static char **arg_syscall_whitelist
= NULL
;
207 static char **arg_syscall_blacklist
= NULL
;
209 static void help(void) {
210 printf("%s [OPTIONS...] [PATH] [ARGUMENTS...]\n\n"
211 "Spawn a minimal namespace container for debugging, testing and building.\n\n"
212 " -h --help Show this help\n"
213 " --version Print version string\n"
214 " -q --quiet Do not show status information\n"
215 " -D --directory=PATH Root directory for the container\n"
216 " --template=PATH Initialize root directory from template directory,\n"
218 " -x --ephemeral Run container with snapshot of root directory, and\n"
219 " remove it after exit\n"
220 " -i --image=PATH File system device or disk image for the container\n"
221 " --root-hash=HASH Specify verity root hash\n"
222 " -a --as-pid2 Maintain a stub init as PID1, invoke binary as PID2\n"
223 " -b --boot Boot up full system (i.e. invoke init)\n"
224 " --chdir=PATH Set working directory in the container\n"
225 " --pivot-root=PATH[:PATH]\n"
226 " Pivot root to given directory in the container\n"
227 " -u --user=USER Run the command under specified user or uid\n"
228 " -M --machine=NAME Set the machine name for the container\n"
229 " --uuid=UUID Set a specific machine UUID for the container\n"
230 " -S --slice=SLICE Place the container in the specified slice\n"
231 " --property=NAME=VALUE Set scope unit property\n"
232 " -U --private-users=pick Run within user namespace, autoselect UID/GID range\n"
233 " --private-users[=UIDBASE[:NUIDS]]\n"
234 " Similar, but with user configured UID/GID range\n"
235 " --private-users-chown Adjust OS tree ownership to private UID/GID range\n"
236 " --private-network Disable network in container\n"
237 " --network-interface=INTERFACE\n"
238 " Assign an existing network interface to the\n"
240 " --network-macvlan=INTERFACE\n"
241 " Create a macvlan network interface based on an\n"
242 " existing network interface to the container\n"
243 " --network-ipvlan=INTERFACE\n"
244 " Create a ipvlan network interface based on an\n"
245 " existing network interface to the container\n"
246 " -n --network-veth Add a virtual Ethernet connection between host\n"
248 " --network-veth-extra=HOSTIF[:CONTAINERIF]\n"
249 " Add an additional virtual Ethernet link between\n"
250 " host and container\n"
251 " --network-bridge=INTERFACE\n"
252 " Add a virtual Ethernet connection to the container\n"
253 " and attach it to an existing bridge on the host\n"
254 " --network-zone=NAME Similar, but attach the new interface to an\n"
255 " an automatically managed bridge interface\n"
256 " -p --port=[PROTOCOL:]HOSTPORT[:CONTAINERPORT]\n"
257 " Expose a container IP port on the host\n"
258 " -Z --selinux-context=SECLABEL\n"
259 " Set the SELinux security context to be used by\n"
260 " processes in the container\n"
261 " -L --selinux-apifs-context=SECLABEL\n"
262 " Set the SELinux security context to be used by\n"
263 " API/tmpfs file systems in the container\n"
264 " --capability=CAP In addition to the default, retain specified\n"
266 " --drop-capability=CAP Drop the specified capability from the default set\n"
267 " --system-call-filter=LIST|~LIST\n"
268 " Permit/prohibit specific system calls\n"
269 " --kill-signal=SIGNAL Select signal to use for shutting down PID 1\n"
270 " --link-journal=MODE Link up guest journal, one of no, auto, guest, \n"
271 " host, try-guest, try-host\n"
272 " -j Equivalent to --link-journal=try-guest\n"
273 " --read-only Mount the root directory read-only\n"
274 " --bind=PATH[:PATH[:OPTIONS]]\n"
275 " Bind mount a file or directory from the host into\n"
277 " --bind-ro=PATH[:PATH[:OPTIONS]\n"
278 " Similar, but creates a read-only bind mount\n"
279 " --tmpfs=PATH:[OPTIONS] Mount an empty tmpfs to the specified directory\n"
280 " --overlay=PATH[:PATH...]:PATH\n"
281 " Create an overlay mount from the host to \n"
283 " --overlay-ro=PATH[:PATH...]:PATH\n"
284 " Similar, but creates a read-only overlay mount\n"
285 " -E --setenv=NAME=VALUE Pass an environment variable to PID 1\n"
286 " --register=BOOLEAN Register container as machine\n"
287 " --keep-unit Do not register a scope for the machine, reuse\n"
288 " the service unit nspawn is running in\n"
289 " --volatile[=MODE] Run the system in volatile mode\n"
290 " --settings=BOOLEAN Load additional settings from .nspawn file\n"
291 " --notify-ready=BOOLEAN Receive notifications from the child init process\n"
292 , program_invocation_short_name
);
295 static int custom_mount_check_all(void) {
298 for (i
= 0; i
< arg_n_custom_mounts
; i
++) {
299 CustomMount
*m
= &arg_custom_mounts
[i
];
301 if (path_equal(m
->destination
, "/") && arg_userns_mode
!= USER_NAMESPACE_NO
) {
303 if (arg_userns_chown
) {
304 log_error("--private-users-chown may not be combined with custom root mounts.");
306 } else if (arg_uid_shift
== UID_INVALID
) {
307 log_error("--private-users with automatic UID shift may not be combined with custom root mounts.");
316 static int detect_unified_cgroup_hierarchy(const char *directory
) {
320 /* Allow the user to control whether the unified hierarchy is used */
321 e
= getenv("UNIFIED_CGROUP_HIERARCHY");
323 r
= parse_boolean(e
);
325 return log_error_errno(r
, "Failed to parse $UNIFIED_CGROUP_HIERARCHY.");
327 arg_unified_cgroup_hierarchy
= CGROUP_UNIFIED_ALL
;
329 arg_unified_cgroup_hierarchy
= CGROUP_UNIFIED_NONE
;
334 /* Otherwise inherit the default from the host system */
335 r
= cg_all_unified();
337 return log_error_errno(r
, "Failed to determine whether we are in all unified mode.");
339 /* Unified cgroup hierarchy support was added in 230. Unfortunately the detection
340 * routine only detects 231, so we'll have a false negative here for 230. */
341 r
= systemd_installation_has_version(directory
, 230);
343 return log_error_errno(r
, "Failed to determine systemd version in container: %m");
345 arg_unified_cgroup_hierarchy
= CGROUP_UNIFIED_ALL
;
347 arg_unified_cgroup_hierarchy
= CGROUP_UNIFIED_NONE
;
348 } else if (cg_unified_controller(SYSTEMD_CGROUP_CONTROLLER
) > 0) {
349 /* Mixed cgroup hierarchy support was added in 233 */
350 r
= systemd_installation_has_version(directory
, 233);
352 return log_error_errno(r
, "Failed to determine systemd version in container: %m");
354 arg_unified_cgroup_hierarchy
= CGROUP_UNIFIED_SYSTEMD
;
356 arg_unified_cgroup_hierarchy
= CGROUP_UNIFIED_NONE
;
358 arg_unified_cgroup_hierarchy
= CGROUP_UNIFIED_NONE
;
363 static void parse_share_ns_env(const char *name
, unsigned long ns_flag
) {
366 r
= getenv_bool(name
);
370 log_warning_errno(r
, "Failed to parse %s from environment, defaulting to false.", name
);
371 arg_clone_ns_flags
= (arg_clone_ns_flags
& ~ns_flag
) | (r
> 0 ? 0 : ns_flag
);
374 static void parse_mount_settings_env(void) {
378 e
= getenv("SYSTEMD_NSPAWN_API_VFS_WRITABLE");
382 if (streq(e
, "network")) {
383 arg_mount_settings
|= MOUNT_APPLY_APIVFS_RO
|MOUNT_APPLY_APIVFS_NETNS
;
387 r
= parse_boolean(e
);
389 log_warning_errno(r
, "Failed to parse SYSTEMD_NSPAWN_API_VFS_WRITABLE from environment, ignoring.");
393 SET_FLAG(arg_mount_settings
, MOUNT_APPLY_APIVFS_RO
, r
== 0);
394 SET_FLAG(arg_mount_settings
, MOUNT_APPLY_APIVFS_NETNS
, false);
397 static int parse_argv(int argc
, char *argv
[]) {
415 ARG_NETWORK_INTERFACE
,
420 ARG_NETWORK_VETH_EXTRA
,
430 ARG_PRIVATE_USERS_CHOWN
,
433 ARG_SYSTEM_CALL_FILTER
,
436 static const struct option options
[] = {
437 { "help", no_argument
, NULL
, 'h' },
438 { "version", no_argument
, NULL
, ARG_VERSION
},
439 { "directory", required_argument
, NULL
, 'D' },
440 { "template", required_argument
, NULL
, ARG_TEMPLATE
},
441 { "ephemeral", no_argument
, NULL
, 'x' },
442 { "user", required_argument
, NULL
, 'u' },
443 { "private-network", no_argument
, NULL
, ARG_PRIVATE_NETWORK
},
444 { "as-pid2", no_argument
, NULL
, 'a' },
445 { "boot", no_argument
, NULL
, 'b' },
446 { "uuid", required_argument
, NULL
, ARG_UUID
},
447 { "read-only", no_argument
, NULL
, ARG_READ_ONLY
},
448 { "capability", required_argument
, NULL
, ARG_CAPABILITY
},
449 { "drop-capability", required_argument
, NULL
, ARG_DROP_CAPABILITY
},
450 { "link-journal", required_argument
, NULL
, ARG_LINK_JOURNAL
},
451 { "bind", required_argument
, NULL
, ARG_BIND
},
452 { "bind-ro", required_argument
, NULL
, ARG_BIND_RO
},
453 { "tmpfs", required_argument
, NULL
, ARG_TMPFS
},
454 { "overlay", required_argument
, NULL
, ARG_OVERLAY
},
455 { "overlay-ro", required_argument
, NULL
, ARG_OVERLAY_RO
},
456 { "machine", required_argument
, NULL
, 'M' },
457 { "slice", required_argument
, NULL
, 'S' },
458 { "setenv", required_argument
, NULL
, 'E' },
459 { "selinux-context", required_argument
, NULL
, 'Z' },
460 { "selinux-apifs-context", required_argument
, NULL
, 'L' },
461 { "quiet", no_argument
, NULL
, 'q' },
462 { "share-system", no_argument
, NULL
, ARG_SHARE_SYSTEM
}, /* not documented */
463 { "register", required_argument
, NULL
, ARG_REGISTER
},
464 { "keep-unit", no_argument
, NULL
, ARG_KEEP_UNIT
},
465 { "network-interface", required_argument
, NULL
, ARG_NETWORK_INTERFACE
},
466 { "network-macvlan", required_argument
, NULL
, ARG_NETWORK_MACVLAN
},
467 { "network-ipvlan", required_argument
, NULL
, ARG_NETWORK_IPVLAN
},
468 { "network-veth", no_argument
, NULL
, 'n' },
469 { "network-veth-extra", required_argument
, NULL
, ARG_NETWORK_VETH_EXTRA
},
470 { "network-bridge", required_argument
, NULL
, ARG_NETWORK_BRIDGE
},
471 { "network-zone", required_argument
, NULL
, ARG_NETWORK_ZONE
},
472 { "personality", required_argument
, NULL
, ARG_PERSONALITY
},
473 { "image", required_argument
, NULL
, 'i' },
474 { "volatile", optional_argument
, NULL
, ARG_VOLATILE
},
475 { "port", required_argument
, NULL
, 'p' },
476 { "property", required_argument
, NULL
, ARG_PROPERTY
},
477 { "private-users", optional_argument
, NULL
, ARG_PRIVATE_USERS
},
478 { "private-users-chown", optional_argument
, NULL
, ARG_PRIVATE_USERS_CHOWN
},
479 { "kill-signal", required_argument
, NULL
, ARG_KILL_SIGNAL
},
480 { "settings", required_argument
, NULL
, ARG_SETTINGS
},
481 { "chdir", required_argument
, NULL
, ARG_CHDIR
},
482 { "pivot-root", required_argument
, NULL
, ARG_PIVOT_ROOT
},
483 { "notify-ready", required_argument
, NULL
, ARG_NOTIFY_READY
},
484 { "root-hash", required_argument
, NULL
, ARG_ROOT_HASH
},
485 { "system-call-filter", required_argument
, NULL
, ARG_SYSTEM_CALL_FILTER
},
491 uint64_t plus
= 0, minus
= 0;
492 bool mask_all_settings
= false, mask_no_settings
= false;
497 while ((c
= getopt_long(argc
, argv
, "+hD:u:abL:M:jS:Z:qi:xp:nUE:", options
, NULL
)) >= 0)
509 r
= parse_path_argument_and_warn(optarg
, false, &arg_directory
);
515 r
= parse_path_argument_and_warn(optarg
, false, &arg_template
);
521 r
= parse_path_argument_and_warn(optarg
, false, &arg_image
);
527 arg_ephemeral
= true;
531 r
= free_and_strdup(&arg_user
, optarg
);
535 arg_settings_mask
|= SETTING_USER
;
538 case ARG_NETWORK_ZONE
: {
541 j
= strappend("vz-", optarg
);
545 if (!ifname_valid(j
)) {
546 log_error("Network zone name not valid: %s", j
);
551 free(arg_network_zone
);
552 arg_network_zone
= j
;
554 arg_network_veth
= true;
555 arg_private_network
= true;
556 arg_settings_mask
|= SETTING_NETWORK
;
560 case ARG_NETWORK_BRIDGE
:
562 if (!ifname_valid(optarg
)) {
563 log_error("Bridge interface name not valid: %s", optarg
);
567 r
= free_and_strdup(&arg_network_bridge
, optarg
);
574 arg_network_veth
= true;
575 arg_private_network
= true;
576 arg_settings_mask
|= SETTING_NETWORK
;
579 case ARG_NETWORK_VETH_EXTRA
:
580 r
= veth_extra_parse(&arg_network_veth_extra
, optarg
);
582 return log_error_errno(r
, "Failed to parse --network-veth-extra= parameter: %s", optarg
);
584 arg_private_network
= true;
585 arg_settings_mask
|= SETTING_NETWORK
;
588 case ARG_NETWORK_INTERFACE
:
590 if (!ifname_valid(optarg
)) {
591 log_error("Network interface name not valid: %s", optarg
);
595 if (strv_extend(&arg_network_interfaces
, optarg
) < 0)
598 arg_private_network
= true;
599 arg_settings_mask
|= SETTING_NETWORK
;
602 case ARG_NETWORK_MACVLAN
:
604 if (!ifname_valid(optarg
)) {
605 log_error("MACVLAN network interface name not valid: %s", optarg
);
609 if (strv_extend(&arg_network_macvlan
, optarg
) < 0)
612 arg_private_network
= true;
613 arg_settings_mask
|= SETTING_NETWORK
;
616 case ARG_NETWORK_IPVLAN
:
618 if (!ifname_valid(optarg
)) {
619 log_error("IPVLAN network interface name not valid: %s", optarg
);
623 if (strv_extend(&arg_network_ipvlan
, optarg
) < 0)
628 case ARG_PRIVATE_NETWORK
:
629 arg_private_network
= true;
630 arg_settings_mask
|= SETTING_NETWORK
;
634 if (arg_start_mode
== START_PID2
) {
635 log_error("--boot and --as-pid2 may not be combined.");
639 arg_start_mode
= START_BOOT
;
640 arg_settings_mask
|= SETTING_START_MODE
;
644 if (arg_start_mode
== START_BOOT
) {
645 log_error("--boot and --as-pid2 may not be combined.");
649 arg_start_mode
= START_PID2
;
650 arg_settings_mask
|= SETTING_START_MODE
;
654 r
= sd_id128_from_string(optarg
, &arg_uuid
);
656 return log_error_errno(r
, "Invalid UUID: %s", optarg
);
658 if (sd_id128_is_null(arg_uuid
)) {
659 log_error("Machine UUID may not be all zeroes.");
663 arg_settings_mask
|= SETTING_MACHINE_ID
;
672 arg_machine
= mfree(arg_machine
);
674 if (!machine_name_is_valid(optarg
)) {
675 log_error("Invalid machine name: %s", optarg
);
679 r
= free_and_strdup(&arg_machine
, optarg
);
686 arg_selinux_context
= optarg
;
690 arg_selinux_apifs_context
= optarg
;
694 arg_read_only
= true;
695 arg_settings_mask
|= SETTING_READ_ONLY
;
699 case ARG_DROP_CAPABILITY
: {
702 _cleanup_free_
char *t
= NULL
;
704 r
= extract_first_word(&p
, &t
, ",", 0);
706 return log_error_errno(r
, "Failed to parse capability %s.", t
);
711 if (streq(t
, "all")) {
712 if (c
== ARG_CAPABILITY
)
713 plus
= (uint64_t) -1;
715 minus
= (uint64_t) -1;
719 cap
= capability_from_name(t
);
721 log_error("Failed to parse capability %s.", t
);
725 if (c
== ARG_CAPABILITY
)
726 plus
|= 1ULL << (uint64_t) cap
;
728 minus
|= 1ULL << (uint64_t) cap
;
732 arg_settings_mask
|= SETTING_CAPABILITY
;
737 arg_link_journal
= LINK_GUEST
;
738 arg_link_journal_try
= true;
741 case ARG_LINK_JOURNAL
:
742 if (streq(optarg
, "auto")) {
743 arg_link_journal
= LINK_AUTO
;
744 arg_link_journal_try
= false;
745 } else if (streq(optarg
, "no")) {
746 arg_link_journal
= LINK_NO
;
747 arg_link_journal_try
= false;
748 } else if (streq(optarg
, "guest")) {
749 arg_link_journal
= LINK_GUEST
;
750 arg_link_journal_try
= false;
751 } else if (streq(optarg
, "host")) {
752 arg_link_journal
= LINK_HOST
;
753 arg_link_journal_try
= false;
754 } else if (streq(optarg
, "try-guest")) {
755 arg_link_journal
= LINK_GUEST
;
756 arg_link_journal_try
= true;
757 } else if (streq(optarg
, "try-host")) {
758 arg_link_journal
= LINK_HOST
;
759 arg_link_journal_try
= true;
761 log_error("Failed to parse link journal mode %s", optarg
);
769 r
= bind_mount_parse(&arg_custom_mounts
, &arg_n_custom_mounts
, optarg
, c
== ARG_BIND_RO
);
771 return log_error_errno(r
, "Failed to parse --bind(-ro)= argument %s: %m", optarg
);
773 arg_settings_mask
|= SETTING_CUSTOM_MOUNTS
;
777 r
= tmpfs_mount_parse(&arg_custom_mounts
, &arg_n_custom_mounts
, optarg
);
779 return log_error_errno(r
, "Failed to parse --tmpfs= argument %s: %m", optarg
);
781 arg_settings_mask
|= SETTING_CUSTOM_MOUNTS
;
786 r
= overlay_mount_parse(&arg_custom_mounts
, &arg_n_custom_mounts
, optarg
, c
== ARG_OVERLAY_RO
);
787 if (r
== -EADDRNOTAVAIL
)
788 return log_error_errno(r
, "--overlay(-ro)= needs at least two colon-separated directories specified.");
790 return log_error_errno(r
, "Failed to parse --overlay(-ro)= argument %s: %m", optarg
);
792 arg_settings_mask
|= SETTING_CUSTOM_MOUNTS
;
798 if (!env_assignment_is_valid(optarg
)) {
799 log_error("Environment variable assignment '%s' is not valid.", optarg
);
803 n
= strv_env_set(arg_setenv
, optarg
);
807 strv_free(arg_setenv
);
810 arg_settings_mask
|= SETTING_ENVIRONMENT
;
818 case ARG_SHARE_SYSTEM
:
819 /* We don't officially support this anymore, except for compat reasons. People should use the
820 * $SYSTEMD_NSPAWN_SHARE_* environment variables instead. */
821 arg_clone_ns_flags
= 0;
825 r
= parse_boolean(optarg
);
827 log_error("Failed to parse --register= argument: %s", optarg
);
835 arg_keep_unit
= true;
838 case ARG_PERSONALITY
:
840 arg_personality
= personality_from_string(optarg
);
841 if (arg_personality
== PERSONALITY_INVALID
) {
842 log_error("Unknown or unsupported personality '%s'.", optarg
);
846 arg_settings_mask
|= SETTING_PERSONALITY
;
852 arg_volatile_mode
= VOLATILE_YES
;
856 m
= volatile_mode_from_string(optarg
);
858 log_error("Failed to parse --volatile= argument: %s", optarg
);
861 arg_volatile_mode
= m
;
864 arg_settings_mask
|= SETTING_VOLATILE_MODE
;
868 r
= expose_port_parse(&arg_expose_ports
, optarg
);
870 return log_error_errno(r
, "Duplicate port specification: %s", optarg
);
872 return log_error_errno(r
, "Failed to parse host port %s: %m", optarg
);
874 arg_settings_mask
|= SETTING_EXPOSE_PORTS
;
878 if (strv_extend(&arg_property
, optarg
) < 0)
883 case ARG_PRIVATE_USERS
: {
888 else if (!in_charset(optarg
, DIGITS
))
889 /* do *not* parse numbers as booleans */
890 boolean
= parse_boolean(optarg
);
892 if (boolean
== false) {
893 /* no: User namespacing off */
894 arg_userns_mode
= USER_NAMESPACE_NO
;
895 arg_uid_shift
= UID_INVALID
;
896 arg_uid_range
= UINT32_C(0x10000);
897 } else if (boolean
== true) {
898 /* yes: User namespacing on, UID range is read from root dir */
899 arg_userns_mode
= USER_NAMESPACE_FIXED
;
900 arg_uid_shift
= UID_INVALID
;
901 arg_uid_range
= UINT32_C(0x10000);
902 } else if (streq(optarg
, "pick")) {
903 /* pick: User namespacing on, UID range is picked randomly */
904 arg_userns_mode
= USER_NAMESPACE_PICK
;
905 arg_uid_shift
= UID_INVALID
;
906 arg_uid_range
= UINT32_C(0x10000);
908 _cleanup_free_
char *buffer
= NULL
;
909 const char *range
, *shift
;
911 /* anything else: User namespacing on, UID range is explicitly configured */
913 range
= strchr(optarg
, ':');
915 buffer
= strndup(optarg
, range
- optarg
);
921 r
= safe_atou32(range
, &arg_uid_range
);
923 return log_error_errno(r
, "Failed to parse UID range \"%s\": %m", range
);
927 r
= parse_uid(shift
, &arg_uid_shift
);
929 return log_error_errno(r
, "Failed to parse UID \"%s\": %m", optarg
);
931 arg_userns_mode
= USER_NAMESPACE_FIXED
;
934 if (arg_uid_range
<= 0) {
935 log_error("UID range cannot be 0.");
939 arg_settings_mask
|= SETTING_USERNS
;
944 if (userns_supported()) {
945 arg_userns_mode
= USER_NAMESPACE_PICK
;
946 arg_uid_shift
= UID_INVALID
;
947 arg_uid_range
= UINT32_C(0x10000);
949 arg_settings_mask
|= SETTING_USERNS
;
954 case ARG_PRIVATE_USERS_CHOWN
:
955 arg_userns_chown
= true;
957 arg_settings_mask
|= SETTING_USERNS
;
960 case ARG_KILL_SIGNAL
:
961 arg_kill_signal
= signal_from_string_try_harder(optarg
);
962 if (arg_kill_signal
< 0) {
963 log_error("Cannot parse signal: %s", optarg
);
967 arg_settings_mask
|= SETTING_KILL_SIGNAL
;
972 /* no → do not read files
973 * yes → read files, do not override cmdline, trust only subset
974 * override → read files, override cmdline, trust only subset
975 * trusted → read files, do not override cmdline, trust all
978 r
= parse_boolean(optarg
);
980 if (streq(optarg
, "trusted")) {
981 mask_all_settings
= false;
982 mask_no_settings
= false;
983 arg_settings_trusted
= true;
985 } else if (streq(optarg
, "override")) {
986 mask_all_settings
= false;
987 mask_no_settings
= true;
988 arg_settings_trusted
= -1;
990 return log_error_errno(r
, "Failed to parse --settings= argument: %s", optarg
);
993 mask_all_settings
= false;
994 mask_no_settings
= false;
995 arg_settings_trusted
= -1;
998 mask_all_settings
= true;
999 mask_no_settings
= false;
1000 arg_settings_trusted
= false;
1006 if (!path_is_absolute(optarg
)) {
1007 log_error("Working directory %s is not an absolute path.", optarg
);
1011 r
= free_and_strdup(&arg_chdir
, optarg
);
1015 arg_settings_mask
|= SETTING_WORKING_DIRECTORY
;
1018 case ARG_PIVOT_ROOT
:
1019 r
= pivot_root_parse(&arg_pivot_root_new
, &arg_pivot_root_old
, optarg
);
1021 return log_error_errno(r
, "Failed to parse --pivot-root= argument %s: %m", optarg
);
1023 arg_settings_mask
|= SETTING_PIVOT_ROOT
;
1026 case ARG_NOTIFY_READY
:
1027 r
= parse_boolean(optarg
);
1029 log_error("%s is not a valid notify mode. Valid modes are: yes, no, and ready.", optarg
);
1032 arg_notify_ready
= r
;
1033 arg_settings_mask
|= SETTING_NOTIFY_READY
;
1036 case ARG_ROOT_HASH
: {
1040 r
= unhexmem(optarg
, strlen(optarg
), &k
, &l
);
1042 return log_error_errno(r
, "Failed to parse root hash: %s", optarg
);
1043 if (l
< sizeof(sd_id128_t
)) {
1044 log_error("Root hash must be at least 128bit long: %s", optarg
);
1049 free(arg_root_hash
);
1051 arg_root_hash_size
= l
;
1055 case ARG_SYSTEM_CALL_FILTER
: {
1059 negative
= optarg
[0] == '~';
1060 items
= negative
? optarg
+ 1 : optarg
;
1063 _cleanup_free_
char *word
= NULL
;
1065 r
= extract_first_word(&items
, &word
, NULL
, 0);
1071 return log_error_errno(r
, "Failed to parse system call filter: %m");
1074 r
= strv_extend(&arg_syscall_blacklist
, word
);
1076 r
= strv_extend(&arg_syscall_whitelist
, word
);
1081 arg_settings_mask
|= SETTING_SYSCALL_FILTER
;
1089 assert_not_reached("Unhandled option");
1092 parse_share_ns_env("SYSTEMD_NSPAWN_SHARE_NS_IPC", CLONE_NEWIPC
);
1093 parse_share_ns_env("SYSTEMD_NSPAWN_SHARE_NS_PID", CLONE_NEWPID
);
1094 parse_share_ns_env("SYSTEMD_NSPAWN_SHARE_NS_UTS", CLONE_NEWUTS
);
1095 parse_share_ns_env("SYSTEMD_NSPAWN_SHARE_SYSTEM", CLONE_NEWIPC
|CLONE_NEWPID
|CLONE_NEWUTS
);
1097 if (arg_userns_mode
!= USER_NAMESPACE_NO
)
1098 arg_mount_settings
|= MOUNT_USE_USERNS
;
1100 if (arg_private_network
)
1101 arg_mount_settings
|= MOUNT_APPLY_APIVFS_NETNS
;
1103 parse_mount_settings_env();
1105 if (!(arg_clone_ns_flags
& CLONE_NEWPID
) ||
1106 !(arg_clone_ns_flags
& CLONE_NEWUTS
)) {
1107 arg_register
= false;
1108 if (arg_start_mode
!= START_PID1
) {
1109 log_error("--boot cannot be used without namespacing.");
1114 if (arg_userns_mode
== USER_NAMESPACE_PICK
)
1115 arg_userns_chown
= true;
1117 if (arg_keep_unit
&& arg_register
&& cg_pid_get_owner_uid(0, NULL
) >= 0) {
1118 /* Save the user from accidentally registering either user-$SESSION.scope or user@.service.
1119 * The latter is not technically a user session, but we don't need to labour the point. */
1120 log_error("--keep-unit --register=yes may not be used when invoked from a user session.");
1124 if (arg_directory
&& arg_image
) {
1125 log_error("--directory= and --image= may not be combined.");
1129 if (arg_template
&& arg_image
) {
1130 log_error("--template= and --image= may not be combined.");
1134 if (arg_ephemeral
&& arg_template
&& !arg_directory
) {
1135 /* User asked for ephemeral execution but specified --template= instead of --directory=. Semantically
1136 * such an invocation makes some sense, see https://github.com/systemd/systemd/issues/3667. Let's
1137 * accept this here, and silently make "--ephemeral --template=" equivalent to "--ephemeral
1140 arg_directory
= arg_template
;
1141 arg_template
= NULL
;
1144 if (arg_template
&& !(arg_directory
|| arg_machine
)) {
1145 log_error("--template= needs --directory= or --machine=.");
1149 if (arg_ephemeral
&& arg_template
) {
1150 log_error("--ephemeral and --template= may not be combined.");
1154 if (arg_ephemeral
&& !IN_SET(arg_link_journal
, LINK_NO
, LINK_AUTO
)) {
1155 log_error("--ephemeral and --link-journal= may not be combined.");
1159 if (arg_userns_mode
!= USER_NAMESPACE_NO
&& !userns_supported()) {
1160 log_error("--private-users= is not supported, kernel compiled without user namespace support.");
1164 if (arg_userns_chown
&& arg_read_only
) {
1165 log_error("--read-only and --private-users-chown may not be combined.");
1169 if (arg_network_bridge
&& arg_network_zone
) {
1170 log_error("--network-bridge= and --network-zone= may not be combined.");
1174 if (argc
> optind
) {
1175 arg_parameters
= strv_copy(argv
+ optind
);
1176 if (!arg_parameters
)
1179 arg_settings_mask
|= SETTING_START_MODE
;
1182 /* Load all settings from .nspawn files */
1183 if (mask_no_settings
)
1184 arg_settings_mask
= 0;
1186 /* Don't load any settings from .nspawn files */
1187 if (mask_all_settings
)
1188 arg_settings_mask
= _SETTINGS_MASK_ALL
;
1190 arg_caps_retain
= (arg_caps_retain
| plus
| (arg_private_network
? 1ULL << CAP_NET_ADMIN
: 0)) & ~minus
;
1192 r
= cg_unified_flush();
1194 return log_error_errno(r
, "Failed to determine whether the unified cgroups hierarchy is used: %m");
1196 e
= getenv("SYSTEMD_NSPAWN_CONTAINER_SERVICE");
1198 arg_container_service_name
= e
;
1200 r
= getenv_bool("SYSTEMD_NSPAWN_USE_CGNS");
1202 arg_use_cgns
= cg_ns_supported();
1206 r
= custom_mount_check_all();
1213 static int verify_arguments(void) {
1214 if (arg_userns_mode
!= USER_NAMESPACE_NO
&& (arg_mount_settings
& MOUNT_APPLY_APIVFS_NETNS
) && !arg_private_network
) {
1215 log_error("Invalid namespacing settings. Mounting sysfs with --private-users requires --private-network.");
1219 if (arg_userns_mode
!= USER_NAMESPACE_NO
&& !(arg_mount_settings
& MOUNT_APPLY_APIVFS_RO
)) {
1220 log_error("Cannot combine --private-users with read-write mounts.");
1224 if (arg_volatile_mode
!= VOLATILE_NO
&& arg_read_only
) {
1225 log_error("Cannot combine --read-only with --volatile. Note that --volatile already implies a read-only base hierarchy.");
1229 if (arg_expose_ports
&& !arg_private_network
) {
1230 log_error("Cannot use --port= without private networking.");
1235 if (arg_expose_ports
) {
1236 log_error("--port= is not supported, compiled without libiptc support.");
1241 if (arg_start_mode
== START_BOOT
&& arg_kill_signal
<= 0)
1242 arg_kill_signal
= SIGRTMIN
+3;
1247 static int userns_lchown(const char *p
, uid_t uid
, gid_t gid
) {
1250 if (arg_userns_mode
== USER_NAMESPACE_NO
)
1253 if (uid
== UID_INVALID
&& gid
== GID_INVALID
)
1256 if (uid
!= UID_INVALID
) {
1257 uid
+= arg_uid_shift
;
1259 if (uid
< arg_uid_shift
|| uid
>= arg_uid_shift
+ arg_uid_range
)
1263 if (gid
!= GID_INVALID
) {
1264 gid
+= (gid_t
) arg_uid_shift
;
1266 if (gid
< (gid_t
) arg_uid_shift
|| gid
>= (gid_t
) (arg_uid_shift
+ arg_uid_range
))
1270 if (lchown(p
, uid
, gid
) < 0)
1276 static int userns_mkdir(const char *root
, const char *path
, mode_t mode
, uid_t uid
, gid_t gid
) {
1279 q
= prefix_roota(root
, path
);
1280 if (mkdir(q
, mode
) < 0) {
1281 if (errno
== EEXIST
)
1286 return userns_lchown(q
, uid
, gid
);
1289 static int setup_timezone(const char *dest
) {
1290 _cleanup_free_
char *p
= NULL
, *q
= NULL
;
1291 const char *where
, *check
, *what
;
1297 /* Fix the timezone, if possible */
1298 r
= readlink_malloc("/etc/localtime", &p
);
1300 log_warning("host's /etc/localtime is not a symlink, not updating container timezone.");
1301 /* to handle warning, delete /etc/localtime and replace it
1302 * with a symbolic link to a time zone data file.
1305 * ln -s /usr/share/zoneinfo/UTC /etc/localtime
1310 z
= path_startswith(p
, "../usr/share/zoneinfo/");
1312 z
= path_startswith(p
, "/usr/share/zoneinfo/");
1314 log_warning("/etc/localtime does not point into /usr/share/zoneinfo/, not updating container timezone.");
1318 where
= prefix_roota(dest
, "/etc/localtime");
1319 r
= readlink_malloc(where
, &q
);
1321 y
= path_startswith(q
, "../usr/share/zoneinfo/");
1323 y
= path_startswith(q
, "/usr/share/zoneinfo/");
1325 /* Already pointing to the right place? Then do nothing .. */
1326 if (y
&& streq(y
, z
))
1330 check
= strjoina("/usr/share/zoneinfo/", z
);
1331 check
= prefix_roota(dest
, check
);
1332 if (laccess(check
, F_OK
) < 0) {
1333 log_warning("Timezone %s does not exist in container, not updating container timezone.", z
);
1337 if (unlink(where
) < 0 && errno
!= ENOENT
) {
1338 log_full_errno(IN_SET(errno
, EROFS
, EACCES
, EPERM
) ? LOG_DEBUG
: LOG_WARNING
, /* Don't complain on read-only images */
1340 "Failed to remove existing timezone info %s in container, ignoring: %m", where
);
1344 what
= strjoina("../usr/share/zoneinfo/", z
);
1345 if (symlink(what
, where
) < 0) {
1346 log_full_errno(IN_SET(errno
, EROFS
, EACCES
, EPERM
) ? LOG_DEBUG
: LOG_WARNING
,
1348 "Failed to correct timezone of container, ignoring: %m");
1352 r
= userns_lchown(where
, 0, 0);
1354 return log_warning_errno(r
, "Failed to chown /etc/localtime: %m");
1359 static int resolved_listening(void) {
1360 _cleanup_(sd_bus_flush_close_unrefp
) sd_bus
*bus
= NULL
;
1361 _cleanup_free_
char *dns_stub_listener_mode
= NULL
;
1364 /* Check if resolved is listening */
1366 r
= sd_bus_open_system(&bus
);
1370 r
= bus_name_has_owner(bus
, "org.freedesktop.resolve1", NULL
);
1374 r
= sd_bus_get_property_string(bus
,
1375 "org.freedesktop.resolve1",
1376 "/org/freedesktop/resolve1",
1377 "org.freedesktop.resolve1.Manager",
1380 &dns_stub_listener_mode
);
1384 return STR_IN_SET(dns_stub_listener_mode
, "udp", "yes");
1387 static int setup_resolv_conf(const char *dest
) {
1388 _cleanup_free_
char *resolved
= NULL
, *etc
= NULL
;
1394 if (arg_private_network
)
1397 r
= chase_symlinks("/etc", dest
, CHASE_PREFIX_ROOT
, &etc
);
1399 log_warning_errno(r
, "Failed to resolve /etc path in container, ignoring: %m");
1403 where
= strjoina(etc
, "/resolv.conf");
1404 found
= chase_symlinks(where
, dest
, CHASE_NONEXISTENT
, &resolved
);
1406 log_warning_errno(found
, "Failed to resolve /etc/resolv.conf path in container, ignoring: %m");
1410 if (access("/usr/lib/systemd/resolv.conf", F_OK
) >= 0 &&
1411 resolved_listening() > 0) {
1413 /* resolved is enabled on the host. In this, case bind mount its static resolv.conf file into the
1414 * container, so that the container can use the host's resolver. Given that network namespacing is
1415 * disabled it's only natural of the container also uses the host's resolver. It also has the big
1416 * advantage that the container will be able to follow the host's DNS server configuration changes
1419 if (found
== 0) /* missing? */
1420 (void) touch(resolved
);
1422 r
= mount_verbose(LOG_DEBUG
, "/usr/lib/systemd/resolv.conf", resolved
, NULL
, MS_BIND
, NULL
);
1424 return mount_verbose(LOG_ERR
, NULL
, resolved
, NULL
, MS_BIND
|MS_REMOUNT
|MS_RDONLY
|MS_NOSUID
|MS_NODEV
, NULL
);
1427 /* If that didn't work, let's copy the file */
1428 r
= copy_file("/etc/resolv.conf", where
, O_TRUNC
|O_NOFOLLOW
, 0644, 0, COPY_REFLINK
);
1430 /* If the file already exists as symlink, let's suppress the warning, under the assumption that
1431 * resolved or something similar runs inside and the symlink points there.
1433 * If the disk image is read-only, there's also no point in complaining.
1435 log_full_errno(IN_SET(r
, -ELOOP
, -EROFS
, -EACCES
, -EPERM
) ? LOG_DEBUG
: LOG_WARNING
, r
,
1436 "Failed to copy /etc/resolv.conf to %s, ignoring: %m", where
);
1440 r
= userns_lchown(where
, 0, 0);
1442 log_warning_errno(r
, "Failed to chown /etc/resolv.conf, ignoring: %m");
1447 static int setup_boot_id(const char *dest
) {
1448 sd_id128_t rnd
= SD_ID128_NULL
;
1449 const char *from
, *to
;
1452 /* Generate a new randomized boot ID, so that each boot-up of
1453 * the container gets a new one */
1455 from
= prefix_roota(dest
, "/run/proc-sys-kernel-random-boot-id");
1456 to
= prefix_roota(dest
, "/proc/sys/kernel/random/boot_id");
1458 r
= sd_id128_randomize(&rnd
);
1460 return log_error_errno(r
, "Failed to generate random boot id: %m");
1462 r
= id128_write(from
, ID128_UUID
, rnd
, false);
1464 return log_error_errno(r
, "Failed to write boot id: %m");
1466 r
= mount_verbose(LOG_ERR
, from
, to
, NULL
, MS_BIND
, NULL
);
1468 r
= mount_verbose(LOG_ERR
, NULL
, to
, NULL
,
1469 MS_BIND
|MS_REMOUNT
|MS_RDONLY
|MS_NOSUID
|MS_NODEV
, NULL
);
1471 (void) unlink(from
);
1475 static int copy_devnodes(const char *dest
) {
1477 static const char devnodes
[] =
1488 _cleanup_umask_ mode_t u
;
1494 /* Create /dev/net, so that we can create /dev/net/tun in it */
1495 if (userns_mkdir(dest
, "/dev/net", 0755, 0, 0) < 0)
1496 return log_error_errno(r
, "Failed to create /dev/net directory: %m");
1498 NULSTR_FOREACH(d
, devnodes
) {
1499 _cleanup_free_
char *from
= NULL
, *to
= NULL
;
1502 from
= strappend("/dev/", d
);
1503 to
= prefix_root(dest
, from
);
1505 if (stat(from
, &st
) < 0) {
1507 if (errno
!= ENOENT
)
1508 return log_error_errno(errno
, "Failed to stat %s: %m", from
);
1510 } else if (!S_ISCHR(st
.st_mode
) && !S_ISBLK(st
.st_mode
)) {
1512 log_error("%s is not a char or block device, cannot copy.", from
);
1516 if (mknod(to
, st
.st_mode
, st
.st_rdev
) < 0) {
1517 /* Explicitly warn the user when /dev is already populated. */
1518 if (errno
== EEXIST
)
1519 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
);
1521 return log_error_errno(errno
, "mknod(%s) failed: %m", to
);
1523 /* Some systems abusively restrict mknod but
1524 * allow bind mounts. */
1527 return log_error_errno(r
, "touch (%s) failed: %m", to
);
1528 r
= mount_verbose(LOG_DEBUG
, from
, to
, NULL
, MS_BIND
, NULL
);
1530 return log_error_errno(r
, "Both mknod and bind mount (%s) failed: %m", to
);
1533 r
= userns_lchown(to
, 0, 0);
1535 return log_error_errno(r
, "chown() of device node %s failed: %m", to
);
1542 static int setup_pts(const char *dest
) {
1543 _cleanup_free_
char *options
= NULL
;
1548 if (arg_selinux_apifs_context
)
1549 (void) asprintf(&options
,
1550 "newinstance,ptmxmode=0666,mode=620,gid=" GID_FMT
",context=\"%s\"",
1551 arg_uid_shift
+ TTY_GID
,
1552 arg_selinux_apifs_context
);
1555 (void) asprintf(&options
,
1556 "newinstance,ptmxmode=0666,mode=620,gid=" GID_FMT
,
1557 arg_uid_shift
+ TTY_GID
);
1562 /* Mount /dev/pts itself */
1563 p
= prefix_roota(dest
, "/dev/pts");
1564 if (mkdir(p
, 0755) < 0)
1565 return log_error_errno(errno
, "Failed to create /dev/pts: %m");
1566 r
= mount_verbose(LOG_ERR
, "devpts", p
, "devpts", MS_NOSUID
|MS_NOEXEC
, options
);
1569 r
= userns_lchown(p
, 0, 0);
1571 return log_error_errno(r
, "Failed to chown /dev/pts: %m");
1573 /* Create /dev/ptmx symlink */
1574 p
= prefix_roota(dest
, "/dev/ptmx");
1575 if (symlink("pts/ptmx", p
) < 0)
1576 return log_error_errno(errno
, "Failed to create /dev/ptmx symlink: %m");
1577 r
= userns_lchown(p
, 0, 0);
1579 return log_error_errno(r
, "Failed to chown /dev/ptmx: %m");
1581 /* And fix /dev/pts/ptmx ownership */
1582 p
= prefix_roota(dest
, "/dev/pts/ptmx");
1583 r
= userns_lchown(p
, 0, 0);
1585 return log_error_errno(r
, "Failed to chown /dev/pts/ptmx: %m");
1590 static int setup_dev_console(const char *dest
, const char *console
) {
1591 _cleanup_umask_ mode_t u
;
1600 r
= chmod_and_chown(console
, 0600, arg_uid_shift
, arg_uid_shift
);
1602 return log_error_errno(r
, "Failed to correct access mode for TTY: %m");
1604 /* We need to bind mount the right tty to /dev/console since
1605 * ptys can only exist on pts file systems. To have something
1606 * to bind mount things on we create a empty regular file. */
1608 to
= prefix_roota(dest
, "/dev/console");
1611 return log_error_errno(r
, "touch() for /dev/console failed: %m");
1613 return mount_verbose(LOG_ERR
, console
, to
, NULL
, MS_BIND
, NULL
);
1616 static int setup_keyring(void) {
1617 key_serial_t keyring
;
1619 /* Allocate a new session keyring for the container. This makes sure the keyring of the session systemd-nspawn
1620 * was invoked from doesn't leak into the container. Note that by default we block keyctl() and request_key()
1621 * anyway via seccomp so doing this operation isn't strictly necessary, but in case people explicitly whitelist
1622 * these system calls let's make sure we don't leak anything into the container. */
1624 keyring
= keyctl(KEYCTL_JOIN_SESSION_KEYRING
, 0, 0, 0, 0);
1625 if (keyring
== -1) {
1626 if (errno
== ENOSYS
)
1627 log_debug_errno(errno
, "Kernel keyring not supported, ignoring.");
1628 else if (IN_SET(errno
, EACCES
, EPERM
))
1629 log_debug_errno(errno
, "Kernel keyring access prohibited, ignoring.");
1631 return log_error_errno(errno
, "Setting up kernel keyring failed: %m");
1637 static int setup_kmsg(const char *dest
, int kmsg_socket
) {
1638 const char *from
, *to
;
1639 _cleanup_umask_ mode_t u
;
1642 assert(kmsg_socket
>= 0);
1646 /* We create the kmsg FIFO as /run/kmsg, but immediately
1647 * delete it after bind mounting it to /proc/kmsg. While FIFOs
1648 * on the reading side behave very similar to /proc/kmsg,
1649 * their writing side behaves differently from /dev/kmsg in
1650 * that writing blocks when nothing is reading. In order to
1651 * avoid any problems with containers deadlocking due to this
1652 * we simply make /dev/kmsg unavailable to the container. */
1653 from
= prefix_roota(dest
, "/run/kmsg");
1654 to
= prefix_roota(dest
, "/proc/kmsg");
1656 if (mkfifo(from
, 0600) < 0)
1657 return log_error_errno(errno
, "mkfifo() for /run/kmsg failed: %m");
1658 r
= mount_verbose(LOG_ERR
, from
, to
, NULL
, MS_BIND
, NULL
);
1662 fd
= open(from
, O_RDWR
|O_NDELAY
|O_CLOEXEC
);
1664 return log_error_errno(errno
, "Failed to open fifo: %m");
1666 /* Store away the fd in the socket, so that it stays open as
1667 * long as we run the child */
1668 r
= send_one_fd(kmsg_socket
, fd
, 0);
1672 return log_error_errno(r
, "Failed to send FIFO fd: %m");
1674 /* And now make the FIFO unavailable as /run/kmsg... */
1675 (void) unlink(from
);
1680 static int on_address_change(sd_netlink
*rtnl
, sd_netlink_message
*m
, void *userdata
) {
1681 union in_addr_union
*exposed
= userdata
;
1687 expose_port_execute(rtnl
, arg_expose_ports
, exposed
);
1691 static int setup_hostname(void) {
1693 if ((arg_clone_ns_flags
& CLONE_NEWUTS
) == 0)
1696 if (sethostname_idempotent(arg_machine
) < 0)
1702 static int setup_journal(const char *directory
) {
1704 _cleanup_free_
char *d
= NULL
;
1710 /* Don't link journals in ephemeral mode */
1714 if (arg_link_journal
== LINK_NO
)
1717 try = arg_link_journal_try
|| arg_link_journal
== LINK_AUTO
;
1719 r
= sd_id128_get_machine(&this_id
);
1721 return log_error_errno(r
, "Failed to retrieve machine ID: %m");
1723 if (sd_id128_equal(arg_uuid
, this_id
)) {
1724 log_full(try ? LOG_WARNING
: LOG_ERR
,
1725 "Host and machine ids are equal (%s): refusing to link journals", sd_id128_to_string(arg_uuid
, id
));
1731 r
= userns_mkdir(directory
, "/var", 0755, 0, 0);
1733 return log_error_errno(r
, "Failed to create /var: %m");
1735 r
= userns_mkdir(directory
, "/var/log", 0755, 0, 0);
1737 return log_error_errno(r
, "Failed to create /var/log: %m");
1739 r
= userns_mkdir(directory
, "/var/log/journal", 0755, 0, 0);
1741 return log_error_errno(r
, "Failed to create /var/log/journal: %m");
1743 (void) sd_id128_to_string(arg_uuid
, id
);
1745 p
= strjoina("/var/log/journal/", id
);
1746 q
= prefix_roota(directory
, p
);
1748 if (path_is_mount_point(p
, NULL
, 0) > 0) {
1752 log_error("%s: already a mount point, refusing to use for journal", p
);
1756 if (path_is_mount_point(q
, NULL
, 0) > 0) {
1760 log_error("%s: already a mount point, refusing to use for journal", q
);
1764 r
= readlink_and_make_absolute(p
, &d
);
1766 if (IN_SET(arg_link_journal
, LINK_GUEST
, LINK_AUTO
) &&
1769 r
= userns_mkdir(directory
, p
, 0755, 0, 0);
1771 log_warning_errno(r
, "Failed to create directory %s: %m", q
);
1776 return log_error_errno(errno
, "Failed to remove symlink %s: %m", p
);
1777 } else if (r
== -EINVAL
) {
1779 if (arg_link_journal
== LINK_GUEST
&&
1782 if (errno
== ENOTDIR
) {
1783 log_error("%s already exists and is neither a symlink nor a directory", p
);
1786 return log_error_errno(errno
, "Failed to remove %s: %m", p
);
1788 } else if (r
!= -ENOENT
)
1789 return log_error_errno(r
, "readlink(%s) failed: %m", p
);
1791 if (arg_link_journal
== LINK_GUEST
) {
1793 if (symlink(q
, p
) < 0) {
1795 log_debug_errno(errno
, "Failed to symlink %s to %s, skipping journal setup: %m", q
, p
);
1798 return log_error_errno(errno
, "Failed to symlink %s to %s: %m", q
, p
);
1801 r
= userns_mkdir(directory
, p
, 0755, 0, 0);
1803 log_warning_errno(r
, "Failed to create directory %s: %m", q
);
1807 if (arg_link_journal
== LINK_HOST
) {
1808 /* don't create parents here — if the host doesn't have
1809 * permanent journal set up, don't force it here */
1811 if (mkdir(p
, 0755) < 0 && errno
!= EEXIST
) {
1813 log_debug_errno(errno
, "Failed to create %s, skipping journal setup: %m", p
);
1816 return log_error_errno(errno
, "Failed to create %s: %m", p
);
1819 } else if (access(p
, F_OK
) < 0)
1822 if (dir_is_empty(q
) == 0)
1823 log_warning("%s is not empty, proceeding anyway.", q
);
1825 r
= userns_mkdir(directory
, p
, 0755, 0, 0);
1827 return log_error_errno(r
, "Failed to create %s: %m", q
);
1829 r
= mount_verbose(LOG_DEBUG
, p
, q
, NULL
, MS_BIND
, NULL
);
1831 return log_error_errno(errno
, "Failed to bind mount journal from host into guest: %m");
1836 static int drop_capabilities(void) {
1837 return capability_bounding_set_drop(arg_caps_retain
, false);
1840 static int reset_audit_loginuid(void) {
1841 _cleanup_free_
char *p
= NULL
;
1844 if ((arg_clone_ns_flags
& CLONE_NEWPID
) == 0)
1847 r
= read_one_line_file("/proc/self/loginuid", &p
);
1851 return log_error_errno(r
, "Failed to read /proc/self/loginuid: %m");
1853 /* Already reset? */
1854 if (streq(p
, "4294967295"))
1857 r
= write_string_file("/proc/self/loginuid", "4294967295", 0);
1860 "Failed to reset audit login UID. This probably means that your kernel is too\n"
1861 "old and you have audit enabled. Note that the auditing subsystem is known to\n"
1862 "be incompatible with containers on old kernels. Please make sure to upgrade\n"
1863 "your kernel or to off auditing with 'audit=0' on the kernel command line before\n"
1864 "using systemd-nspawn. Sleeping for 5s... (%m)");
1873 static int setup_propagate(const char *root
) {
1877 (void) mkdir_p("/run/systemd/nspawn/", 0755);
1878 (void) mkdir_p("/run/systemd/nspawn/propagate", 0600);
1879 p
= strjoina("/run/systemd/nspawn/propagate/", arg_machine
);
1880 (void) mkdir_p(p
, 0600);
1882 r
= userns_mkdir(root
, "/run/systemd", 0755, 0, 0);
1884 return log_error_errno(r
, "Failed to create /run/systemd: %m");
1886 r
= userns_mkdir(root
, "/run/systemd/nspawn", 0755, 0, 0);
1888 return log_error_errno(r
, "Failed to create /run/systemd/nspawn: %m");
1890 r
= userns_mkdir(root
, "/run/systemd/nspawn/incoming", 0600, 0, 0);
1892 return log_error_errno(r
, "Failed to create /run/systemd/nspawn/incoming: %m");
1894 q
= prefix_roota(root
, "/run/systemd/nspawn/incoming");
1895 r
= mount_verbose(LOG_ERR
, p
, q
, NULL
, MS_BIND
, NULL
);
1899 r
= mount_verbose(LOG_ERR
, NULL
, q
, NULL
, MS_BIND
|MS_REMOUNT
|MS_RDONLY
, NULL
);
1903 /* machined will MS_MOVE into that directory, and that's only
1904 * supported for non-shared mounts. */
1905 return mount_verbose(LOG_ERR
, NULL
, q
, NULL
, MS_SLAVE
, NULL
);
1908 static int setup_machine_id(const char *directory
) {
1909 const char *etc_machine_id
;
1913 /* If the UUID in the container is already set, then that's what counts, and we use. If it isn't set, and the
1914 * caller passed --uuid=, then we'll pass it in the $container_uuid env var to PID 1 of the container. The
1915 * assumption is that PID 1 will then write it to /etc/machine-id to make it persistent. If --uuid= is not
1916 * passed we generate a random UUID, and pass it via $container_uuid. In effect this means that /etc/machine-id
1917 * in the container and our idea of the container UUID will always be in sync (at least if PID 1 in the
1918 * container behaves nicely). */
1920 etc_machine_id
= prefix_roota(directory
, "/etc/machine-id");
1922 r
= id128_read(etc_machine_id
, ID128_PLAIN
, &id
);
1924 if (!IN_SET(r
, -ENOENT
, -ENOMEDIUM
)) /* If the file is missing or empty, we don't mind */
1925 return log_error_errno(r
, "Failed to read machine ID from container image: %m");
1927 if (sd_id128_is_null(arg_uuid
)) {
1928 r
= sd_id128_randomize(&arg_uuid
);
1930 return log_error_errno(r
, "Failed to acquire randomized machine UUID: %m");
1933 if (sd_id128_is_null(id
)) {
1934 log_error("Machine ID in container image is zero, refusing.");
1944 static int recursive_chown(const char *directory
, uid_t shift
, uid_t range
) {
1949 if (arg_userns_mode
== USER_NAMESPACE_NO
|| !arg_userns_chown
)
1952 r
= path_patch_uid(directory
, arg_uid_shift
, arg_uid_range
);
1953 if (r
== -EOPNOTSUPP
)
1954 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.");
1956 return log_error_errno(r
, "Upper 16 bits of root directory UID and GID do not match.");
1958 return log_error_errno(r
, "Failed to adjust UID/GID shift of OS tree: %m");
1960 log_debug("Root directory of image is already owned by the right UID/GID range, skipping recursive chown operation.");
1962 log_debug("Patched directory tree to match UID/GID range.");
1969 * < 0 : wait_for_terminate() failed to get the state of the
1970 * container, the container was terminated by a signal, or
1971 * failed for an unknown reason. No change is made to the
1972 * container argument.
1973 * > 0 : The program executed in the container terminated with an
1974 * error. The exit code of the program executed in the
1975 * container is returned. The container argument has been set
1976 * to CONTAINER_TERMINATED.
1977 * 0 : The container is being rebooted, has been shut down or exited
1978 * successfully. The container argument has been set to either
1979 * CONTAINER_TERMINATED or CONTAINER_REBOOTED.
1981 * That is, success is indicated by a return value of zero, and an
1982 * error is indicated by a non-zero value.
1984 static int wait_for_container(pid_t pid
, ContainerStatus
*container
) {
1988 r
= wait_for_terminate(pid
, &status
);
1990 return log_warning_errno(r
, "Failed to wait for container: %m");
1992 switch (status
.si_code
) {
1995 if (status
.si_status
== 0)
1996 log_full(arg_quiet
? LOG_DEBUG
: LOG_INFO
, "Container %s exited successfully.", arg_machine
);
1998 log_full(arg_quiet
? LOG_DEBUG
: LOG_INFO
, "Container %s failed with error code %i.", arg_machine
, status
.si_status
);
2000 *container
= CONTAINER_TERMINATED
;
2001 return status
.si_status
;
2004 if (status
.si_status
== SIGINT
) {
2005 log_full(arg_quiet
? LOG_DEBUG
: LOG_INFO
, "Container %s has been shut down.", arg_machine
);
2006 *container
= CONTAINER_TERMINATED
;
2009 } else if (status
.si_status
== SIGHUP
) {
2010 log_full(arg_quiet
? LOG_DEBUG
: LOG_INFO
, "Container %s is being rebooted.", arg_machine
);
2011 *container
= CONTAINER_REBOOTED
;
2018 log_error("Container %s terminated by signal %s.", arg_machine
, signal_to_string(status
.si_status
));
2022 log_error("Container %s failed due to unknown reason.", arg_machine
);
2027 static int on_orderly_shutdown(sd_event_source
*s
, const struct signalfd_siginfo
*si
, void *userdata
) {
2030 pid
= PTR_TO_PID(userdata
);
2032 if (kill(pid
, arg_kill_signal
) >= 0) {
2033 log_info("Trying to halt container. Send SIGTERM again to trigger immediate termination.");
2034 sd_event_source_set_userdata(s
, NULL
);
2039 sd_event_exit(sd_event_source_get_event(s
), 0);
2043 static int on_sigchld(sd_event_source
*s
, const struct signalfd_siginfo
*ssi
, void *userdata
) {
2046 if (waitid(P_ALL
, 0, &si
, WNOHANG
|WNOWAIT
|WEXITED
) < 0)
2047 return log_error_errno(errno
, "Failed to waitid(): %m");
2048 if (si
.si_pid
== 0) /* No pending children. */
2050 if (si
.si_pid
== PTR_TO_PID(userdata
)) {
2051 /* The main process we care for has exited. Return from
2052 * signal handler but leave the zombie. */
2053 sd_event_exit(sd_event_source_get_event(s
), 0);
2056 /* Reap all other children. */
2057 (void) waitid(P_PID
, si
.si_pid
, &si
, WNOHANG
|WEXITED
);
2063 static int determine_names(void) {
2066 if (arg_template
&& !arg_directory
&& arg_machine
) {
2068 /* If --template= was specified then we should not
2069 * search for a machine, but instead create a new one
2070 * in /var/lib/machine. */
2072 arg_directory
= strjoin("/var/lib/machines/", arg_machine
);
2077 if (!arg_image
&& !arg_directory
) {
2079 _cleanup_(image_unrefp
) Image
*i
= NULL
;
2081 r
= image_find(arg_machine
, &i
);
2083 return log_error_errno(r
, "Failed to find image for machine '%s': %m", arg_machine
);
2085 log_error("No image for machine '%s'.", arg_machine
);
2089 if (IN_SET(i
->type
, IMAGE_RAW
, IMAGE_BLOCK
))
2090 r
= free_and_strdup(&arg_image
, i
->path
);
2092 r
= free_and_strdup(&arg_directory
, i
->path
);
2097 arg_read_only
= arg_read_only
|| i
->read_only
;
2099 arg_directory
= get_current_dir_name();
2101 if (!arg_directory
&& !arg_image
) {
2102 log_error("Failed to determine path, please use -D or -i.");
2109 if (arg_directory
&& path_equal(arg_directory
, "/"))
2110 arg_machine
= gethostname_malloc();
2115 arg_machine
= strdup(basename(arg_image
));
2117 /* Truncate suffix if there is one */
2118 e
= endswith(arg_machine
, ".raw");
2122 arg_machine
= strdup(basename(arg_directory
));
2127 hostname_cleanup(arg_machine
);
2128 if (!machine_name_is_valid(arg_machine
)) {
2129 log_error("Failed to determine machine name automatically, please use -M.");
2133 if (arg_ephemeral
) {
2136 /* Add a random suffix when this is an
2137 * ephemeral machine, so that we can run many
2138 * instances at once without manually having
2139 * to specify -M each time. */
2141 if (asprintf(&b
, "%s-%016" PRIx64
, arg_machine
, random_u64()) < 0)
2152 static int chase_symlinks_and_update(char **p
, unsigned flags
) {
2161 r
= chase_symlinks(*p
, NULL
, flags
, &chased
);
2163 return log_error_errno(r
, "Failed to resolve path %s: %m", *p
);
2171 static int determine_uid_shift(const char *directory
) {
2174 if (arg_userns_mode
== USER_NAMESPACE_NO
) {
2179 if (arg_uid_shift
== UID_INVALID
) {
2182 r
= stat(directory
, &st
);
2184 return log_error_errno(errno
, "Failed to determine UID base of %s: %m", directory
);
2186 arg_uid_shift
= st
.st_uid
& UINT32_C(0xffff0000);
2188 if (arg_uid_shift
!= (st
.st_gid
& UINT32_C(0xffff0000))) {
2189 log_error("UID and GID base of %s don't match.", directory
);
2193 arg_uid_range
= UINT32_C(0x10000);
2196 if (arg_uid_shift
> (uid_t
) -1 - arg_uid_range
) {
2197 log_error("UID base too high for UID range.");
2204 static int inner_child(
2206 const char *directory
,
2212 _cleanup_free_
char *home
= NULL
;
2215 const char *envp
[] = {
2216 "PATH=" DEFAULT_PATH_SPLIT_USR
,
2217 NULL
, /* container */
2222 NULL
, /* container_uuid */
2223 NULL
, /* LISTEN_FDS */
2224 NULL
, /* LISTEN_PID */
2225 NULL
, /* NOTIFY_SOCKET */
2228 const char *exec_target
;
2230 _cleanup_strv_free_
char **env_use
= NULL
;
2235 assert(kmsg_socket
>= 0);
2237 if (arg_userns_mode
!= USER_NAMESPACE_NO
) {
2238 /* Tell the parent, that it now can write the UID map. */
2239 (void) barrier_place(barrier
); /* #1 */
2241 /* Wait until the parent wrote the UID map */
2242 if (!barrier_place_and_sync(barrier
)) { /* #2 */
2243 log_error("Parent died too early");
2248 r
= reset_uid_gid();
2250 return log_error_errno(r
, "Couldn't become new root: %m");
2253 arg_mount_settings
| MOUNT_IN_USERNS
,
2256 arg_selinux_apifs_context
);
2261 r
= mount_sysfs(NULL
, arg_mount_settings
);
2265 /* Wait until we are cgroup-ified, so that we
2266 * can mount the right cgroup path writable */
2267 if (!barrier_place_and_sync(barrier
)) { /* #3 */
2268 log_error("Parent died too early");
2272 if (arg_use_cgns
&& cg_ns_supported()) {
2273 r
= unshare(CLONE_NEWCGROUP
);
2275 return log_error_errno(errno
, "Failed to unshare cgroup namespace");
2278 arg_unified_cgroup_hierarchy
,
2279 arg_userns_mode
!= USER_NAMESPACE_NO
,
2282 arg_selinux_apifs_context
,
2287 r
= mount_systemd_cgroup_writable("", arg_unified_cgroup_hierarchy
);
2292 r
= setup_boot_id(NULL
);
2296 r
= setup_kmsg(NULL
, kmsg_socket
);
2299 kmsg_socket
= safe_close(kmsg_socket
);
2304 return log_error_errno(errno
, "setsid() failed: %m");
2306 if (arg_private_network
)
2309 if (arg_expose_ports
) {
2310 r
= expose_port_send_rtnl(rtnl_socket
);
2313 rtnl_socket
= safe_close(rtnl_socket
);
2316 r
= drop_capabilities();
2318 return log_error_errno(r
, "drop_capabilities() failed: %m");
2322 if (arg_personality
!= PERSONALITY_INVALID
) {
2323 r
= safe_personality(arg_personality
);
2325 return log_error_errno(r
, "personality() failed: %m");
2326 } else if (secondary
) {
2327 r
= safe_personality(PER_LINUX32
);
2329 return log_error_errno(r
, "personality() failed: %m");
2333 if (arg_selinux_context
)
2334 if (setexeccon(arg_selinux_context
) < 0)
2335 return log_error_errno(errno
, "setexeccon(\"%s\") failed: %m", arg_selinux_context
);
2338 r
= change_uid_gid(arg_user
, &home
);
2342 /* LXC sets container=lxc, so follow the scheme here */
2343 envp
[n_env
++] = strjoina("container=", arg_container_service_name
);
2345 envp
[n_env
] = strv_find_prefix(environ
, "TERM=");
2349 if ((asprintf((char**)(envp
+ n_env
++), "HOME=%s", home
? home
: "/root") < 0) ||
2350 (asprintf((char**)(envp
+ n_env
++), "USER=%s", arg_user
? arg_user
: "root") < 0) ||
2351 (asprintf((char**)(envp
+ n_env
++), "LOGNAME=%s", arg_user
? arg_user
: "root") < 0))
2354 assert(!sd_id128_is_null(arg_uuid
));
2356 if (asprintf((char**)(envp
+ n_env
++), "container_uuid=%s", id128_to_uuid_string(arg_uuid
, as_uuid
)) < 0)
2359 if (fdset_size(fds
) > 0) {
2360 r
= fdset_cloexec(fds
, false);
2362 return log_error_errno(r
, "Failed to unset O_CLOEXEC for file descriptors.");
2364 if ((asprintf((char **)(envp
+ n_env
++), "LISTEN_FDS=%u", fdset_size(fds
)) < 0) ||
2365 (asprintf((char **)(envp
+ n_env
++), "LISTEN_PID=1") < 0))
2368 if (asprintf((char **)(envp
+ n_env
++), "NOTIFY_SOCKET=%s", NSPAWN_NOTIFY_SOCKET_PATH
) < 0)
2371 env_use
= strv_env_merge(2, envp
, arg_setenv
);
2375 /* Let the parent know that we are ready and
2376 * wait until the parent is ready with the
2378 if (!barrier_place_and_sync(barrier
)) { /* #4 */
2379 log_error("Parent died too early");
2384 if (chdir(arg_chdir
) < 0)
2385 return log_error_errno(errno
, "Failed to change to specified working directory %s: %m", arg_chdir
);
2387 if (arg_start_mode
== START_PID2
) {
2388 r
= stub_pid1(arg_uuid
);
2393 /* Now, explicitly close the log, so that we
2394 * then can close all remaining fds. Closing
2395 * the log explicitly first has the benefit
2396 * that the logging subsystem knows about it,
2397 * and is thus ready to be reopened should we
2398 * need it again. Note that the other fds
2399 * closed here are at least the locking and
2402 (void) fdset_close_others(fds
);
2404 if (arg_start_mode
== START_BOOT
) {
2408 /* Automatically search for the init system */
2410 m
= strv_length(arg_parameters
);
2411 a
= newa(char*, m
+ 2);
2412 memcpy_safe(a
+ 1, arg_parameters
, m
* sizeof(char*));
2415 a
[0] = (char*) "/usr/lib/systemd/systemd";
2416 execve(a
[0], a
, env_use
);
2418 a
[0] = (char*) "/lib/systemd/systemd";
2419 execve(a
[0], a
, env_use
);
2421 a
[0] = (char*) "/sbin/init";
2422 execve(a
[0], a
, env_use
);
2424 exec_target
= "/usr/lib/systemd/systemd, /lib/systemd/systemd, /sbin/init";
2425 } else if (!strv_isempty(arg_parameters
)) {
2426 exec_target
= arg_parameters
[0];
2427 execvpe(arg_parameters
[0], arg_parameters
, env_use
);
2430 /* If we cannot change the directory, we'll end up in /, that is expected. */
2431 (void) chdir(home
?: "/root");
2433 execle("/bin/bash", "-bash", NULL
, env_use
);
2434 execle("/bin/sh", "-sh", NULL
, env_use
);
2436 exec_target
= "/bin/bash, /bin/sh";
2441 return log_error_errno(r
, "execv(%s) failed: %m", exec_target
);
2444 static int setup_sd_notify_child(void) {
2445 static const int one
= 1;
2447 union sockaddr_union sa
= {
2448 .sa
.sa_family
= AF_UNIX
,
2452 fd
= socket(AF_UNIX
, SOCK_DGRAM
|SOCK_CLOEXEC
|SOCK_NONBLOCK
, 0);
2454 return log_error_errno(errno
, "Failed to allocate notification socket: %m");
2456 (void) mkdir_parents(NSPAWN_NOTIFY_SOCKET_PATH
, 0755);
2457 (void) unlink(NSPAWN_NOTIFY_SOCKET_PATH
);
2459 strncpy(sa
.un
.sun_path
, NSPAWN_NOTIFY_SOCKET_PATH
, sizeof(sa
.un
.sun_path
)-1);
2460 r
= bind(fd
, &sa
.sa
, SOCKADDR_UN_LEN(sa
.un
));
2463 return log_error_errno(errno
, "bind(%s) failed: %m", sa
.un
.sun_path
);
2466 r
= userns_lchown(NSPAWN_NOTIFY_SOCKET_PATH
, 0, 0);
2469 return log_error_errno(r
, "Failed to chown " NSPAWN_NOTIFY_SOCKET_PATH
": %m");
2472 r
= setsockopt(fd
, SOL_SOCKET
, SO_PASSCRED
, &one
, sizeof(one
));
2475 return log_error_errno(errno
, "SO_PASSCRED failed: %m");
2481 static int outer_child(
2483 const char *directory
,
2484 const char *console
,
2485 DissectedImage
*dissected_image
,
2493 int uid_shift_socket
,
2499 _cleanup_close_
int fd
= -1;
2504 assert(pid_socket
>= 0);
2505 assert(uuid_socket
>= 0);
2506 assert(notify_socket
>= 0);
2507 assert(kmsg_socket
>= 0);
2509 if (prctl(PR_SET_PDEATHSIG
, SIGKILL
) < 0)
2510 return log_error_errno(errno
, "PR_SET_PDEATHSIG failed: %m");
2513 close_nointr(STDIN_FILENO
);
2514 close_nointr(STDOUT_FILENO
);
2515 close_nointr(STDERR_FILENO
);
2517 r
= open_terminal(console
, O_RDWR
);
2518 if (r
!= STDIN_FILENO
) {
2524 return log_error_errno(r
, "Failed to open console: %m");
2527 if (dup2(STDIN_FILENO
, STDOUT_FILENO
) != STDOUT_FILENO
||
2528 dup2(STDIN_FILENO
, STDERR_FILENO
) != STDERR_FILENO
)
2529 return log_error_errno(errno
, "Failed to duplicate console: %m");
2532 r
= reset_audit_loginuid();
2536 /* Mark everything as slave, so that we still
2537 * receive mounts from the real root, but don't
2538 * propagate mounts to the real root. */
2539 r
= mount_verbose(LOG_ERR
, NULL
, "/", NULL
, MS_SLAVE
|MS_REC
, NULL
);
2543 if (dissected_image
) {
2544 r
= dissected_image_mount(dissected_image
, directory
, DISSECT_IMAGE_DISCARD_ON_LOOP
|(arg_read_only
? DISSECT_IMAGE_READ_ONLY
: 0));
2549 r
= determine_uid_shift(directory
);
2553 if (arg_userns_mode
!= USER_NAMESPACE_NO
) {
2554 /* Let the parent know which UID shift we read from the image */
2555 l
= send(uid_shift_socket
, &arg_uid_shift
, sizeof(arg_uid_shift
), MSG_NOSIGNAL
);
2557 return log_error_errno(errno
, "Failed to send UID shift: %m");
2558 if (l
!= sizeof(arg_uid_shift
)) {
2559 log_error("Short write while sending UID shift.");
2563 if (arg_userns_mode
== USER_NAMESPACE_PICK
) {
2564 /* When we are supposed to pick the UID shift, the parent will check now whether the UID shift
2565 * we just read from the image is available. If yes, it will send the UID shift back to us, if
2566 * not it will pick a different one, and send it back to us. */
2568 l
= recv(uid_shift_socket
, &arg_uid_shift
, sizeof(arg_uid_shift
), 0);
2570 return log_error_errno(errno
, "Failed to recv UID shift: %m");
2571 if (l
!= sizeof(arg_uid_shift
)) {
2572 log_error("Short read while receiving UID shift.");
2577 log_info("Selected user namespace base " UID_FMT
" and range " UID_FMT
".", arg_uid_shift
, arg_uid_range
);
2580 /* Turn directory into bind mount */
2581 r
= mount_verbose(LOG_ERR
, directory
, directory
, NULL
, MS_BIND
|MS_REC
, NULL
);
2585 r
= setup_pivot_root(
2588 arg_pivot_root_old
);
2595 arg_userns_mode
!= USER_NAMESPACE_NO
,
2598 arg_selinux_context
);
2602 r
= setup_volatile_state(
2605 arg_userns_mode
!= USER_NAMESPACE_NO
,
2608 arg_selinux_context
);
2612 /* Mark everything as shared so our mounts get propagated down. This is
2613 * required to make new bind mounts available in systemd services
2614 * inside the containter that create a new mount namespace.
2615 * See https://github.com/systemd/systemd/issues/3860
2616 * Further submounts (such as /dev) done after this will inherit the
2617 * shared propagation mode. */
2618 r
= mount_verbose(LOG_ERR
, NULL
, directory
, NULL
, MS_SHARED
|MS_REC
, NULL
);
2622 r
= recursive_chown(directory
, arg_uid_shift
, arg_uid_range
);
2626 r
= base_filesystem_create(directory
, arg_uid_shift
, (gid_t
) arg_uid_shift
);
2630 if (arg_read_only
) {
2631 r
= bind_remount_recursive(directory
, true, NULL
);
2633 return log_error_errno(r
, "Failed to make tree read-only: %m");
2636 r
= mount_all(directory
,
2640 arg_selinux_apifs_context
);
2644 r
= copy_devnodes(directory
);
2648 dev_setup(directory
, arg_uid_shift
, arg_uid_shift
);
2650 r
= setup_pts(directory
);
2654 r
= setup_propagate(directory
);
2658 r
= setup_dev_console(directory
, console
);
2662 r
= setup_keyring();
2666 r
= setup_seccomp(arg_caps_retain
, arg_syscall_whitelist
, arg_syscall_blacklist
);
2670 r
= setup_timezone(directory
);
2674 r
= setup_resolv_conf(directory
);
2678 r
= setup_machine_id(directory
);
2682 r
= setup_journal(directory
);
2689 arg_n_custom_mounts
,
2690 arg_userns_mode
!= USER_NAMESPACE_NO
,
2693 arg_selinux_apifs_context
);
2697 if (!arg_use_cgns
|| !cg_ns_supported()) {
2700 arg_unified_cgroup_hierarchy
,
2701 arg_userns_mode
!= USER_NAMESPACE_NO
,
2704 arg_selinux_apifs_context
,
2710 r
= mount_move_root(directory
);
2712 return log_error_errno(r
, "Failed to move root directory: %m");
2714 fd
= setup_sd_notify_child();
2718 pid
= raw_clone(SIGCHLD
|CLONE_NEWNS
|
2719 arg_clone_ns_flags
|
2720 (arg_private_network
? CLONE_NEWNET
: 0) |
2721 (arg_userns_mode
!= USER_NAMESPACE_NO
? CLONE_NEWUSER
: 0));
2723 return log_error_errno(errno
, "Failed to fork inner child: %m");
2725 pid_socket
= safe_close(pid_socket
);
2726 uuid_socket
= safe_close(uuid_socket
);
2727 notify_socket
= safe_close(notify_socket
);
2728 uid_shift_socket
= safe_close(uid_shift_socket
);
2730 /* The inner child has all namespaces that are
2731 * requested, so that we all are owned by the user if
2732 * user namespaces are turned on. */
2734 r
= inner_child(barrier
, directory
, secondary
, kmsg_socket
, rtnl_socket
, fds
);
2736 _exit(EXIT_FAILURE
);
2738 _exit(EXIT_SUCCESS
);
2741 l
= send(pid_socket
, &pid
, sizeof(pid
), MSG_NOSIGNAL
);
2743 return log_error_errno(errno
, "Failed to send PID: %m");
2744 if (l
!= sizeof(pid
)) {
2745 log_error("Short write while sending PID.");
2749 l
= send(uuid_socket
, &arg_uuid
, sizeof(arg_uuid
), MSG_NOSIGNAL
);
2751 return log_error_errno(errno
, "Failed to send machine ID: %m");
2752 if (l
!= sizeof(arg_uuid
)) {
2753 log_error("Short write while sending machine ID.");
2757 l
= send_one_fd(notify_socket
, fd
, 0);
2759 return log_error_errno(errno
, "Failed to send notify fd: %m");
2761 pid_socket
= safe_close(pid_socket
);
2762 uuid_socket
= safe_close(uuid_socket
);
2763 notify_socket
= safe_close(notify_socket
);
2764 kmsg_socket
= safe_close(kmsg_socket
);
2765 rtnl_socket
= safe_close(rtnl_socket
);
2770 static int uid_shift_pick(uid_t
*shift
, LockFile
*ret_lock_file
) {
2771 unsigned n_tries
= 100;
2776 assert(ret_lock_file
);
2777 assert(arg_userns_mode
== USER_NAMESPACE_PICK
);
2778 assert(arg_uid_range
== 0x10000U
);
2782 (void) mkdir("/run/systemd/nspawn-uid", 0755);
2785 char lock_path
[strlen("/run/systemd/nspawn-uid/") + DECIMAL_STR_MAX(uid_t
) + 1];
2786 _cleanup_release_lock_file_ LockFile lf
= LOCK_FILE_INIT
;
2791 if (candidate
< UID_SHIFT_PICK_MIN
|| candidate
> UID_SHIFT_PICK_MAX
)
2793 if ((candidate
& UINT32_C(0xFFFF)) != 0)
2796 xsprintf(lock_path
, "/run/systemd/nspawn-uid/" UID_FMT
, candidate
);
2797 r
= make_lock_file(lock_path
, LOCK_EX
|LOCK_NB
, &lf
);
2798 if (r
== -EBUSY
) /* Range already taken by another nspawn instance */
2803 /* Make some superficial checks whether the range is currently known in the user database */
2804 if (getpwuid(candidate
))
2806 if (getpwuid(candidate
+ UINT32_C(0xFFFE)))
2808 if (getgrgid(candidate
))
2810 if (getgrgid(candidate
+ UINT32_C(0xFFFE)))
2813 *ret_lock_file
= lf
;
2814 lf
= (struct LockFile
) LOCK_FILE_INIT
;
2819 random_bytes(&candidate
, sizeof(candidate
));
2820 candidate
= (candidate
% (UID_SHIFT_PICK_MAX
- UID_SHIFT_PICK_MIN
)) + UID_SHIFT_PICK_MIN
;
2821 candidate
&= (uid_t
) UINT32_C(0xFFFF0000);
2825 static int setup_uid_map(pid_t pid
) {
2826 char uid_map
[strlen("/proc//uid_map") + DECIMAL_STR_MAX(uid_t
) + 1], line
[DECIMAL_STR_MAX(uid_t
)*3+3+1];
2831 xsprintf(uid_map
, "/proc/" PID_FMT
"/uid_map", pid
);
2832 xsprintf(line
, UID_FMT
" " UID_FMT
" " UID_FMT
"\n", 0, arg_uid_shift
, arg_uid_range
);
2833 r
= write_string_file(uid_map
, line
, 0);
2835 return log_error_errno(r
, "Failed to write UID map: %m");
2837 /* We always assign the same UID and GID ranges */
2838 xsprintf(uid_map
, "/proc/" PID_FMT
"/gid_map", pid
);
2839 r
= write_string_file(uid_map
, line
, 0);
2841 return log_error_errno(r
, "Failed to write GID map: %m");
2846 static int nspawn_dispatch_notify_fd(sd_event_source
*source
, int fd
, uint32_t revents
, void *userdata
) {
2847 char buf
[NOTIFY_BUFFER_MAX
+1];
2849 struct iovec iovec
= {
2851 .iov_len
= sizeof(buf
)-1,
2854 struct cmsghdr cmsghdr
;
2855 uint8_t buf
[CMSG_SPACE(sizeof(struct ucred
)) +
2856 CMSG_SPACE(sizeof(int) * NOTIFY_FD_MAX
)];
2858 struct msghdr msghdr
= {
2861 .msg_control
= &control
,
2862 .msg_controllen
= sizeof(control
),
2864 struct cmsghdr
*cmsg
;
2865 struct ucred
*ucred
= NULL
;
2867 pid_t inner_child_pid
;
2868 _cleanup_strv_free_
char **tags
= NULL
;
2872 inner_child_pid
= PTR_TO_PID(userdata
);
2874 if (revents
!= EPOLLIN
) {
2875 log_warning("Got unexpected poll event for notify fd.");
2879 n
= recvmsg(fd
, &msghdr
, MSG_DONTWAIT
|MSG_CMSG_CLOEXEC
);
2881 if (IN_SET(errno
, EAGAIN
, EINTR
))
2884 return log_warning_errno(errno
, "Couldn't read notification socket: %m");
2886 cmsg_close_all(&msghdr
);
2888 CMSG_FOREACH(cmsg
, &msghdr
) {
2889 if (cmsg
->cmsg_level
== SOL_SOCKET
&&
2890 cmsg
->cmsg_type
== SCM_CREDENTIALS
&&
2891 cmsg
->cmsg_len
== CMSG_LEN(sizeof(struct ucred
))) {
2893 ucred
= (struct ucred
*) CMSG_DATA(cmsg
);
2897 if (!ucred
|| ucred
->pid
!= inner_child_pid
) {
2898 log_debug("Received notify message without valid credentials. Ignoring.");
2902 if ((size_t) n
>= sizeof(buf
)) {
2903 log_warning("Received notify message exceeded maximum size. Ignoring.");
2908 tags
= strv_split(buf
, "\n\r");
2912 if (strv_find(tags
, "READY=1"))
2913 sd_notifyf(false, "READY=1\n");
2915 p
= strv_find_startswith(tags
, "STATUS=");
2917 sd_notifyf(false, "STATUS=Container running: %s", p
);
2922 static int setup_sd_notify_parent(sd_event
*event
, int fd
, pid_t
*inner_child_pid
, sd_event_source
**notify_event_source
) {
2925 r
= sd_event_add_io(event
, notify_event_source
, fd
, EPOLLIN
, nspawn_dispatch_notify_fd
, inner_child_pid
);
2927 return log_error_errno(r
, "Failed to allocate notify event source: %m");
2929 (void) sd_event_source_set_description(*notify_event_source
, "nspawn-notify");
2934 static int load_settings(void) {
2935 _cleanup_(settings_freep
) Settings
*settings
= NULL
;
2936 _cleanup_fclose_
FILE *f
= NULL
;
2937 _cleanup_free_
char *p
= NULL
;
2941 /* If all settings are masked, there's no point in looking for
2942 * the settings file */
2943 if ((arg_settings_mask
& _SETTINGS_MASK_ALL
) == _SETTINGS_MASK_ALL
)
2946 fn
= strjoina(arg_machine
, ".nspawn");
2948 /* We first look in the admin's directories in /etc and /run */
2949 FOREACH_STRING(i
, "/etc/systemd/nspawn", "/run/systemd/nspawn") {
2950 _cleanup_free_
char *j
= NULL
;
2952 j
= strjoin(i
, "/", fn
);
2961 /* By default, we trust configuration from /etc and /run */
2962 if (arg_settings_trusted
< 0)
2963 arg_settings_trusted
= true;
2968 if (errno
!= ENOENT
)
2969 return log_error_errno(errno
, "Failed to open %s: %m", j
);
2973 /* After that, let's look for a file next to the
2974 * actual image we shall boot. */
2977 p
= file_in_same_dir(arg_image
, fn
);
2980 } else if (arg_directory
) {
2981 p
= file_in_same_dir(arg_directory
, fn
);
2988 if (!f
&& errno
!= ENOENT
)
2989 return log_error_errno(errno
, "Failed to open %s: %m", p
);
2991 /* By default, we do not trust configuration from /var/lib/machines */
2992 if (arg_settings_trusted
< 0)
2993 arg_settings_trusted
= false;
3000 log_debug("Settings are trusted: %s", yes_no(arg_settings_trusted
));
3002 r
= settings_load(f
, p
, &settings
);
3006 /* Copy over bits from the settings, unless they have been
3007 * explicitly masked by command line switches. */
3009 if ((arg_settings_mask
& SETTING_START_MODE
) == 0 &&
3010 settings
->start_mode
>= 0) {
3011 arg_start_mode
= settings
->start_mode
;
3013 strv_free(arg_parameters
);
3014 arg_parameters
= settings
->parameters
;
3015 settings
->parameters
= NULL
;
3018 if ((arg_settings_mask
& SETTING_PIVOT_ROOT
) == 0 &&
3019 settings
->pivot_root_new
) {
3020 free_and_replace(arg_pivot_root_new
, settings
->pivot_root_new
);
3021 free_and_replace(arg_pivot_root_old
, settings
->pivot_root_old
);
3024 if ((arg_settings_mask
& SETTING_WORKING_DIRECTORY
) == 0 &&
3025 settings
->working_directory
) {
3027 arg_chdir
= settings
->working_directory
;
3028 settings
->working_directory
= NULL
;
3031 if ((arg_settings_mask
& SETTING_ENVIRONMENT
) == 0 &&
3032 settings
->environment
) {
3033 strv_free(arg_setenv
);
3034 arg_setenv
= settings
->environment
;
3035 settings
->environment
= NULL
;
3038 if ((arg_settings_mask
& SETTING_USER
) == 0 &&
3041 arg_user
= settings
->user
;
3042 settings
->user
= NULL
;
3045 if ((arg_settings_mask
& SETTING_CAPABILITY
) == 0) {
3048 plus
= settings
->capability
;
3049 if (settings_private_network(settings
))
3050 plus
|= (1ULL << CAP_NET_ADMIN
);
3052 if (!arg_settings_trusted
&& plus
!= 0) {
3053 if (settings
->capability
!= 0)
3054 log_warning("Ignoring Capability= setting, file %s is not trusted.", p
);
3056 arg_caps_retain
|= plus
;
3058 arg_caps_retain
&= ~settings
->drop_capability
;
3061 if ((arg_settings_mask
& SETTING_KILL_SIGNAL
) == 0 &&
3062 settings
->kill_signal
> 0)
3063 arg_kill_signal
= settings
->kill_signal
;
3065 if ((arg_settings_mask
& SETTING_PERSONALITY
) == 0 &&
3066 settings
->personality
!= PERSONALITY_INVALID
)
3067 arg_personality
= settings
->personality
;
3069 if ((arg_settings_mask
& SETTING_MACHINE_ID
) == 0 &&
3070 !sd_id128_is_null(settings
->machine_id
)) {
3072 if (!arg_settings_trusted
)
3073 log_warning("Ignoring MachineID= setting, file %s is not trusted.", p
);
3075 arg_uuid
= settings
->machine_id
;
3078 if ((arg_settings_mask
& SETTING_READ_ONLY
) == 0 &&
3079 settings
->read_only
>= 0)
3080 arg_read_only
= settings
->read_only
;
3082 if ((arg_settings_mask
& SETTING_VOLATILE_MODE
) == 0 &&
3083 settings
->volatile_mode
!= _VOLATILE_MODE_INVALID
)
3084 arg_volatile_mode
= settings
->volatile_mode
;
3086 if ((arg_settings_mask
& SETTING_CUSTOM_MOUNTS
) == 0 &&
3087 settings
->n_custom_mounts
> 0) {
3089 if (!arg_settings_trusted
)
3090 log_warning("Ignoring TemporaryFileSystem=, Bind= and BindReadOnly= settings, file %s is not trusted.", p
);
3092 custom_mount_free_all(arg_custom_mounts
, arg_n_custom_mounts
);
3093 arg_custom_mounts
= settings
->custom_mounts
;
3094 arg_n_custom_mounts
= settings
->n_custom_mounts
;
3096 settings
->custom_mounts
= NULL
;
3097 settings
->n_custom_mounts
= 0;
3101 if ((arg_settings_mask
& SETTING_NETWORK
) == 0 &&
3102 (settings
->private_network
>= 0 ||
3103 settings
->network_veth
>= 0 ||
3104 settings
->network_bridge
||
3105 settings
->network_zone
||
3106 settings
->network_interfaces
||
3107 settings
->network_macvlan
||
3108 settings
->network_ipvlan
||
3109 settings
->network_veth_extra
)) {
3111 if (!arg_settings_trusted
)
3112 log_warning("Ignoring network settings, file %s is not trusted.", p
);
3114 arg_network_veth
= settings_network_veth(settings
);
3115 arg_private_network
= settings_private_network(settings
);
3117 strv_free(arg_network_interfaces
);
3118 arg_network_interfaces
= settings
->network_interfaces
;
3119 settings
->network_interfaces
= NULL
;
3121 strv_free(arg_network_macvlan
);
3122 arg_network_macvlan
= settings
->network_macvlan
;
3123 settings
->network_macvlan
= NULL
;
3125 strv_free(arg_network_ipvlan
);
3126 arg_network_ipvlan
= settings
->network_ipvlan
;
3127 settings
->network_ipvlan
= NULL
;
3129 strv_free(arg_network_veth_extra
);
3130 arg_network_veth_extra
= settings
->network_veth_extra
;
3131 settings
->network_veth_extra
= NULL
;
3133 free(arg_network_bridge
);
3134 arg_network_bridge
= settings
->network_bridge
;
3135 settings
->network_bridge
= NULL
;
3137 free(arg_network_zone
);
3138 arg_network_zone
= settings
->network_zone
;
3139 settings
->network_zone
= NULL
;
3143 if ((arg_settings_mask
& SETTING_EXPOSE_PORTS
) == 0 &&
3144 settings
->expose_ports
) {
3146 if (!arg_settings_trusted
)
3147 log_warning("Ignoring Port= setting, file %s is not trusted.", p
);
3149 expose_port_free_all(arg_expose_ports
);
3150 arg_expose_ports
= settings
->expose_ports
;
3151 settings
->expose_ports
= NULL
;
3155 if ((arg_settings_mask
& SETTING_USERNS
) == 0 &&
3156 settings
->userns_mode
!= _USER_NAMESPACE_MODE_INVALID
) {
3158 if (!arg_settings_trusted
)
3159 log_warning("Ignoring PrivateUsers= and PrivateUsersChown= settings, file %s is not trusted.", p
);
3161 arg_userns_mode
= settings
->userns_mode
;
3162 arg_uid_shift
= settings
->uid_shift
;
3163 arg_uid_range
= settings
->uid_range
;
3164 arg_userns_chown
= settings
->userns_chown
;
3168 if ((arg_settings_mask
& SETTING_NOTIFY_READY
) == 0)
3169 arg_notify_ready
= settings
->notify_ready
;
3171 if ((arg_settings_mask
& SETTING_SYSCALL_FILTER
) == 0) {
3173 if (!arg_settings_trusted
&& !strv_isempty(arg_syscall_whitelist
))
3174 log_warning("Ignoring SystemCallFilter= settings, file %s is not trusted.", p
);
3176 strv_free(arg_syscall_whitelist
);
3177 strv_free(arg_syscall_blacklist
);
3179 arg_syscall_whitelist
= settings
->syscall_whitelist
;
3180 arg_syscall_blacklist
= settings
->syscall_blacklist
;
3182 settings
->syscall_whitelist
= settings
->syscall_blacklist
= NULL
;
3189 static int run(int master
,
3190 const char* console
,
3191 DissectedImage
*dissected_image
,
3195 char veth_name
[IFNAMSIZ
], bool *veth_created
,
3196 union in_addr_union
*exposed
,
3197 pid_t
*pid
, int *ret
) {
3199 static const struct sigaction sa
= {
3200 .sa_handler
= nop_signal_handler
,
3201 .sa_flags
= SA_NOCLDSTOP
|SA_RESTART
,
3204 _cleanup_release_lock_file_ LockFile uid_shift_lock
= LOCK_FILE_INIT
;
3205 _cleanup_close_
int etc_passwd_lock
= -1;
3206 _cleanup_close_pair_
int
3207 kmsg_socket_pair
[2] = { -1, -1 },
3208 rtnl_socket_pair
[2] = { -1, -1 },
3209 pid_socket_pair
[2] = { -1, -1 },
3210 uuid_socket_pair
[2] = { -1, -1 },
3211 notify_socket_pair
[2] = { -1, -1 },
3212 uid_shift_socket_pair
[2] = { -1, -1 };
3213 _cleanup_close_
int notify_socket
= -1;
3214 _cleanup_(barrier_destroy
) Barrier barrier
= BARRIER_NULL
;
3215 _cleanup_(sd_event_source_unrefp
) sd_event_source
*notify_event_source
= NULL
;
3216 _cleanup_(sd_event_unrefp
) sd_event
*event
= NULL
;
3217 _cleanup_(pty_forward_freep
) PTYForward
*forward
= NULL
;
3218 _cleanup_(sd_netlink_unrefp
) sd_netlink
*rtnl
= NULL
;
3219 ContainerStatus container_status
= 0;
3225 assert_se(sigemptyset(&mask_chld
) == 0);
3226 assert_se(sigaddset(&mask_chld
, SIGCHLD
) == 0);
3228 if (arg_userns_mode
== USER_NAMESPACE_PICK
) {
3229 /* When we shall pick the UID/GID range, let's first lock /etc/passwd, so that we can safely
3230 * check with getpwuid() if the specific user already exists. Note that /etc might be
3231 * read-only, in which case this will fail with EROFS. But that's really OK, as in that case we
3232 * can be reasonably sure that no users are going to be added. Note that getpwuid() checks are
3233 * really just an extra safety net. We kinda assume that the UID range we allocate from is
3236 etc_passwd_lock
= take_etc_passwd_lock(NULL
);
3237 if (etc_passwd_lock
< 0 && etc_passwd_lock
!= -EROFS
)
3238 return log_error_errno(etc_passwd_lock
, "Failed to take /etc/passwd lock: %m");
3241 r
= barrier_create(&barrier
);
3243 return log_error_errno(r
, "Cannot initialize IPC barrier: %m");
3245 if (socketpair(AF_UNIX
, SOCK_SEQPACKET
|SOCK_CLOEXEC
, 0, kmsg_socket_pair
) < 0)
3246 return log_error_errno(errno
, "Failed to create kmsg socket pair: %m");
3248 if (socketpair(AF_UNIX
, SOCK_SEQPACKET
|SOCK_CLOEXEC
, 0, rtnl_socket_pair
) < 0)
3249 return log_error_errno(errno
, "Failed to create rtnl socket pair: %m");
3251 if (socketpair(AF_UNIX
, SOCK_SEQPACKET
|SOCK_CLOEXEC
, 0, pid_socket_pair
) < 0)
3252 return log_error_errno(errno
, "Failed to create pid socket pair: %m");
3254 if (socketpair(AF_UNIX
, SOCK_SEQPACKET
|SOCK_CLOEXEC
, 0, uuid_socket_pair
) < 0)
3255 return log_error_errno(errno
, "Failed to create id socket pair: %m");
3257 if (socketpair(AF_UNIX
, SOCK_SEQPACKET
|SOCK_CLOEXEC
, 0, notify_socket_pair
) < 0)
3258 return log_error_errno(errno
, "Failed to create notify socket pair: %m");
3260 if (arg_userns_mode
!= USER_NAMESPACE_NO
)
3261 if (socketpair(AF_UNIX
, SOCK_SEQPACKET
|SOCK_CLOEXEC
, 0, uid_shift_socket_pair
) < 0)
3262 return log_error_errno(errno
, "Failed to create uid shift socket pair: %m");
3264 /* Child can be killed before execv(), so handle SIGCHLD in order to interrupt
3265 * parent's blocking calls and give it a chance to call wait() and terminate. */
3266 r
= sigprocmask(SIG_UNBLOCK
, &mask_chld
, NULL
);
3268 return log_error_errno(errno
, "Failed to change the signal mask: %m");
3270 r
= sigaction(SIGCHLD
, &sa
, NULL
);
3272 return log_error_errno(errno
, "Failed to install SIGCHLD handler: %m");
3274 *pid
= raw_clone(SIGCHLD
|CLONE_NEWNS
);
3276 return log_error_errno(errno
, "clone() failed%s: %m",
3278 ", do you have namespace support enabled in your kernel? (You need UTS, IPC, PID and NET namespacing built in)" : "");
3281 /* The outer child only has a file system namespace. */
3282 barrier_set_role(&barrier
, BARRIER_CHILD
);
3284 master
= safe_close(master
);
3286 kmsg_socket_pair
[0] = safe_close(kmsg_socket_pair
[0]);
3287 rtnl_socket_pair
[0] = safe_close(rtnl_socket_pair
[0]);
3288 pid_socket_pair
[0] = safe_close(pid_socket_pair
[0]);
3289 uuid_socket_pair
[0] = safe_close(uuid_socket_pair
[0]);
3290 notify_socket_pair
[0] = safe_close(notify_socket_pair
[0]);
3291 uid_shift_socket_pair
[0] = safe_close(uid_shift_socket_pair
[0]);
3293 (void) reset_all_signal_handlers();
3294 (void) reset_signal_mask();
3296 r
= outer_child(&barrier
,
3303 uuid_socket_pair
[1],
3304 notify_socket_pair
[1],
3305 kmsg_socket_pair
[1],
3306 rtnl_socket_pair
[1],
3307 uid_shift_socket_pair
[1],
3310 _exit(EXIT_FAILURE
);
3312 _exit(EXIT_SUCCESS
);
3315 barrier_set_role(&barrier
, BARRIER_PARENT
);
3317 fds
= fdset_free(fds
);
3319 kmsg_socket_pair
[1] = safe_close(kmsg_socket_pair
[1]);
3320 rtnl_socket_pair
[1] = safe_close(rtnl_socket_pair
[1]);
3321 pid_socket_pair
[1] = safe_close(pid_socket_pair
[1]);
3322 uuid_socket_pair
[1] = safe_close(uuid_socket_pair
[1]);
3323 notify_socket_pair
[1] = safe_close(notify_socket_pair
[1]);
3324 uid_shift_socket_pair
[1] = safe_close(uid_shift_socket_pair
[1]);
3326 if (arg_userns_mode
!= USER_NAMESPACE_NO
) {
3327 /* The child just let us know the UID shift it might have read from the image. */
3328 l
= recv(uid_shift_socket_pair
[0], &arg_uid_shift
, sizeof arg_uid_shift
, 0);
3330 return log_error_errno(errno
, "Failed to read UID shift: %m");
3331 if (l
!= sizeof arg_uid_shift
) {
3332 log_error("Short read while reading UID shift.");
3336 if (arg_userns_mode
== USER_NAMESPACE_PICK
) {
3337 /* If we are supposed to pick the UID shift, let's try to use the shift read from the
3338 * image, but if that's already in use, pick a new one, and report back to the child,
3339 * which one we now picked. */
3341 r
= uid_shift_pick(&arg_uid_shift
, &uid_shift_lock
);
3343 return log_error_errno(r
, "Failed to pick suitable UID/GID range: %m");
3345 l
= send(uid_shift_socket_pair
[0], &arg_uid_shift
, sizeof arg_uid_shift
, MSG_NOSIGNAL
);
3347 return log_error_errno(errno
, "Failed to send UID shift: %m");
3348 if (l
!= sizeof arg_uid_shift
) {
3349 log_error("Short write while writing UID shift.");
3355 /* Wait for the outer child. */
3356 r
= wait_for_terminate_and_warn("namespace helper", *pid
, NULL
);
3358 return r
< 0 ? r
: -EIO
;
3360 /* And now retrieve the PID of the inner child. */
3361 l
= recv(pid_socket_pair
[0], pid
, sizeof *pid
, 0);
3363 return log_error_errno(errno
, "Failed to read inner child PID: %m");
3364 if (l
!= sizeof *pid
) {
3365 log_error("Short read while reading inner child PID.");
3369 /* We also retrieve container UUID in case it was generated by outer child */
3370 l
= recv(uuid_socket_pair
[0], &arg_uuid
, sizeof arg_uuid
, 0);
3372 return log_error_errno(errno
, "Failed to read container machine ID: %m");
3373 if (l
!= sizeof(arg_uuid
)) {
3374 log_error("Short read while reading container machined ID.");
3378 /* We also retrieve the socket used for notifications generated by outer child */
3379 notify_socket
= receive_one_fd(notify_socket_pair
[0], 0);
3380 if (notify_socket
< 0)
3381 return log_error_errno(notify_socket
,
3382 "Failed to receive notification socket from the outer child: %m");
3384 log_debug("Init process invoked as PID "PID_FMT
, *pid
);
3386 if (arg_userns_mode
!= USER_NAMESPACE_NO
) {
3387 if (!barrier_place_and_sync(&barrier
)) { /* #1 */
3388 log_error("Child died too early.");
3392 r
= setup_uid_map(*pid
);
3396 (void) barrier_place(&barrier
); /* #2 */
3399 if (arg_private_network
) {
3401 r
= move_network_interfaces(*pid
, arg_network_interfaces
);
3405 if (arg_network_veth
) {
3406 r
= setup_veth(arg_machine
, *pid
, veth_name
,
3407 arg_network_bridge
|| arg_network_zone
);
3413 if (arg_network_bridge
) {
3414 /* Add the interface to a bridge */
3415 r
= setup_bridge(veth_name
, arg_network_bridge
, false);
3420 } else if (arg_network_zone
) {
3421 /* Add the interface to a bridge, possibly creating it */
3422 r
= setup_bridge(veth_name
, arg_network_zone
, true);
3430 r
= setup_veth_extra(arg_machine
, *pid
, arg_network_veth_extra
);
3434 /* We created the primary and extra veth links now; let's remember this, so that we know to
3435 remove them later on. Note that we don't bother with removing veth links that were created
3436 here when their setup failed half-way, because in that case the kernel should be able to
3437 remove them on its own, since they cannot be referenced by anything yet. */
3438 *veth_created
= true;
3440 r
= setup_macvlan(arg_machine
, *pid
, arg_network_macvlan
);
3444 r
= setup_ipvlan(arg_machine
, *pid
, arg_network_ipvlan
);
3450 r
= register_machine(
3457 arg_custom_mounts
, arg_n_custom_mounts
,
3461 arg_container_service_name
);
3464 } else if (!arg_keep_unit
) {
3469 arg_custom_mounts
, arg_n_custom_mounts
,
3475 } else if (arg_slice
|| arg_property
)
3476 log_notice("Machine and scope registration turned off, --slice= and --property= settings will have no effect.");
3478 r
= sync_cgroup(*pid
, arg_unified_cgroup_hierarchy
, arg_uid_shift
);
3482 if (arg_keep_unit
) {
3483 r
= create_subcgroup(*pid
, arg_unified_cgroup_hierarchy
);
3488 r
= chown_cgroup(*pid
, arg_uid_shift
);
3492 /* Notify the child that the parent is ready with all
3493 * its setup (including cgroup-ification), and that
3494 * the child can now hand over control to the code to
3495 * run inside the container. */
3496 (void) barrier_place(&barrier
); /* #3 */
3498 /* Block SIGCHLD here, before notifying child.
3499 * process_pty() will handle it with the other signals. */
3500 assert_se(sigprocmask(SIG_BLOCK
, &mask_chld
, NULL
) >= 0);
3502 /* Reset signal to default */
3503 r
= default_signals(SIGCHLD
, -1);
3505 return log_error_errno(r
, "Failed to reset SIGCHLD: %m");
3507 r
= sd_event_new(&event
);
3509 return log_error_errno(r
, "Failed to get default event source: %m");
3511 r
= setup_sd_notify_parent(event
, notify_socket
, PID_TO_PTR(*pid
), ¬ify_event_source
);
3515 /* Let the child know that we are ready and wait that the child is completely ready now. */
3516 if (!barrier_place_and_sync(&barrier
)) { /* #4 */
3517 log_error("Child died too early.");
3521 /* At this point we have made use of the UID we picked, and thus nss-mymachines
3522 * will make them appear in getpwuid(), thus we can release the /etc/passwd lock. */
3523 etc_passwd_lock
= safe_close(etc_passwd_lock
);
3526 "STATUS=Container running.\n"
3527 "X_NSPAWN_LEADER_PID=" PID_FMT
, *pid
);
3528 if (!arg_notify_ready
)
3529 sd_notify(false, "READY=1\n");
3531 if (arg_kill_signal
> 0) {
3532 /* Try to kill the init system on SIGINT or SIGTERM */
3533 sd_event_add_signal(event
, NULL
, SIGINT
, on_orderly_shutdown
, PID_TO_PTR(*pid
));
3534 sd_event_add_signal(event
, NULL
, SIGTERM
, on_orderly_shutdown
, PID_TO_PTR(*pid
));
3536 /* Immediately exit */
3537 sd_event_add_signal(event
, NULL
, SIGINT
, NULL
, NULL
);
3538 sd_event_add_signal(event
, NULL
, SIGTERM
, NULL
, NULL
);
3541 /* Exit when the child exits */
3542 sd_event_add_signal(event
, NULL
, SIGCHLD
, on_sigchld
, PID_TO_PTR(*pid
));
3544 if (arg_expose_ports
) {
3545 r
= expose_port_watch_rtnl(event
, rtnl_socket_pair
[0], on_address_change
, exposed
, &rtnl
);
3549 (void) expose_port_execute(rtnl
, arg_expose_ports
, exposed
);
3552 rtnl_socket_pair
[0] = safe_close(rtnl_socket_pair
[0]);
3554 r
= pty_forward_new(event
, master
,
3555 PTY_FORWARD_IGNORE_VHANGUP
| (interactive
? 0 : PTY_FORWARD_READ_ONLY
),
3558 return log_error_errno(r
, "Failed to create PTY forwarder: %m");
3560 r
= sd_event_loop(event
);
3562 return log_error_errno(r
, "Failed to run event loop: %m");
3564 pty_forward_get_last_char(forward
, &last_char
);
3566 forward
= pty_forward_free(forward
);
3568 if (!arg_quiet
&& last_char
!= '\n')
3571 /* Kill if it is not dead yet anyway */
3572 if (arg_register
&& !arg_keep_unit
)
3573 terminate_machine(*pid
);
3575 /* Normally redundant, but better safe than sorry */
3576 (void) kill(*pid
, SIGKILL
);
3578 r
= wait_for_container(*pid
, &container_status
);
3582 /* We failed to wait for the container, or the container exited abnormally. */
3584 if (r
> 0 || container_status
== CONTAINER_TERMINATED
) {
3585 /* r > 0 → The container exited with a non-zero status.
3586 * As a special case, we need to replace 133 with a different value,
3587 * because 133 is special-cased in the service file to reboot the container.
3588 * otherwise → The container exited with zero status and a reboot was not requested.
3590 if (r
== EXIT_FORCE_RESTART
)
3591 r
= EXIT_FAILURE
; /* replace 133 with the general failure code */
3593 return 0; /* finito */
3596 /* CONTAINER_REBOOTED, loop again */
3598 if (arg_keep_unit
) {
3599 /* Special handling if we are running as a service: instead of simply
3600 * restarting the machine we want to restart the entire service, so let's
3601 * inform systemd about this with the special exit code 133. The service
3602 * file uses RestartForceExitStatus=133 so that this results in a full
3603 * nspawn restart. This is necessary since we might have cgroup parameters
3604 * set we want to have flushed out. */
3605 *ret
= EXIT_FORCE_RESTART
;
3606 return 0; /* finito */
3609 expose_port_flush(arg_expose_ports
, exposed
);
3611 (void) remove_veth_links(veth_name
, arg_network_veth_extra
);
3612 *veth_created
= false;
3613 return 1; /* loop again */
3616 int main(int argc
, char *argv
[]) {
3618 _cleanup_free_
char *console
= NULL
;
3619 _cleanup_close_
int master
= -1;
3620 _cleanup_fdset_free_ FDSet
*fds
= NULL
;
3621 int r
, n_fd_passed
, ret
= EXIT_SUCCESS
;
3622 char veth_name
[IFNAMSIZ
] = "";
3623 bool secondary
= false, remove_directory
= false, remove_image
= false;
3625 union in_addr_union exposed
= {};
3626 _cleanup_release_lock_file_ LockFile tree_global_lock
= LOCK_FILE_INIT
, tree_local_lock
= LOCK_FILE_INIT
;
3627 bool interactive
, veth_created
= false, remove_tmprootdir
= false;
3628 char tmprootdir
[] = "/tmp/nspawn-root-XXXXXX";
3629 _cleanup_(loop_device_unrefp
) LoopDevice
*loop
= NULL
;
3630 _cleanup_(decrypted_image_unrefp
) DecryptedImage
*decrypted_image
= NULL
;
3631 _cleanup_(dissected_image_unrefp
) DissectedImage
*dissected_image
= NULL
;
3633 log_parse_environment();
3636 /* Make sure rename_process() in the stub init process can work */
3640 r
= parse_argv(argc
, argv
);
3644 if (geteuid() != 0) {
3645 log_error("Need to be root.");
3649 r
= determine_names();
3653 r
= load_settings();
3657 r
= verify_arguments();
3661 n_fd_passed
= sd_listen_fds(false);
3662 if (n_fd_passed
> 0) {
3663 r
= fdset_new_listen_fds(&fds
, false);
3665 log_error_errno(r
, "Failed to collect file descriptors: %m");
3670 if (arg_directory
) {
3673 if (path_equal(arg_directory
, "/") && !arg_ephemeral
) {
3674 log_error("Spawning container on root directory is not supported. Consider using --ephemeral.");
3679 if (arg_ephemeral
) {
3680 _cleanup_free_
char *np
= NULL
;
3682 r
= chase_symlinks_and_update(&arg_directory
, 0);
3686 /* If the specified path is a mount point we
3687 * generate the new snapshot immediately
3688 * inside it under a random name. However if
3689 * the specified is not a mount point we
3690 * create the new snapshot in the parent
3691 * directory, just next to it. */
3692 r
= path_is_mount_point(arg_directory
, NULL
, 0);
3694 log_error_errno(r
, "Failed to determine whether directory %s is mount point: %m", arg_directory
);
3698 r
= tempfn_random_child(arg_directory
, "machine.", &np
);
3700 r
= tempfn_random(arg_directory
, "machine.", &np
);
3702 log_error_errno(r
, "Failed to generate name for directory snapshot: %m");
3706 r
= image_path_lock(np
, (arg_read_only
? LOCK_SH
: LOCK_EX
) | LOCK_NB
, &tree_global_lock
, &tree_local_lock
);
3708 log_error_errno(r
, "Failed to lock %s: %m", np
);
3712 r
= btrfs_subvol_snapshot(arg_directory
, np
,
3713 (arg_read_only
? BTRFS_SNAPSHOT_READ_ONLY
: 0) |
3714 BTRFS_SNAPSHOT_FALLBACK_COPY
|
3715 BTRFS_SNAPSHOT_FALLBACK_DIRECTORY
|
3716 BTRFS_SNAPSHOT_RECURSIVE
|
3717 BTRFS_SNAPSHOT_QUOTA
);
3719 log_error_errno(r
, "Failed to create snapshot %s from %s: %m", np
, arg_directory
);
3723 free(arg_directory
);
3727 remove_directory
= true;
3730 r
= chase_symlinks_and_update(&arg_directory
, arg_template
? CHASE_NONEXISTENT
: 0);
3734 r
= image_path_lock(arg_directory
, (arg_read_only
? LOCK_SH
: LOCK_EX
) | LOCK_NB
, &tree_global_lock
, &tree_local_lock
);
3736 log_error_errno(r
, "Directory tree %s is currently busy.", arg_directory
);
3740 log_error_errno(r
, "Failed to lock %s: %m", arg_directory
);
3745 r
= chase_symlinks_and_update(&arg_template
, 0);
3749 r
= btrfs_subvol_snapshot(arg_template
, arg_directory
,
3750 (arg_read_only
? BTRFS_SNAPSHOT_READ_ONLY
: 0) |
3751 BTRFS_SNAPSHOT_FALLBACK_COPY
|
3752 BTRFS_SNAPSHOT_FALLBACK_DIRECTORY
|
3753 BTRFS_SNAPSHOT_FALLBACK_IMMUTABLE
|
3754 BTRFS_SNAPSHOT_RECURSIVE
|
3755 BTRFS_SNAPSHOT_QUOTA
);
3758 log_info("Directory %s already exists, not populating from template %s.", arg_directory
, arg_template
);
3760 log_error_errno(r
, "Couldn't create snapshot %s from %s: %m", arg_directory
, arg_template
);
3764 log_info("Populated %s from template %s.", arg_directory
, arg_template
);
3769 if (arg_start_mode
== START_BOOT
) {
3770 if (path_is_os_tree(arg_directory
) <= 0) {
3771 log_error("Directory %s doesn't look like an OS root directory (os-release file is missing). Refusing.", arg_directory
);
3778 p
= strjoina(arg_directory
, "/usr/");
3779 if (laccess(p
, F_OK
) < 0) {
3780 log_error("Directory %s doesn't look like it has an OS tree. Refusing.", arg_directory
);
3788 assert(!arg_template
);
3790 r
= chase_symlinks_and_update(&arg_image
, 0);
3794 if (arg_ephemeral
) {
3795 _cleanup_free_
char *np
= NULL
;
3797 r
= tempfn_random(arg_image
, "machine.", &np
);
3799 log_error_errno(r
, "Failed to generate name for image snapshot: %m");
3803 r
= image_path_lock(np
, (arg_read_only
? LOCK_SH
: LOCK_EX
) | LOCK_NB
, &tree_global_lock
, &tree_local_lock
);
3805 r
= log_error_errno(r
, "Failed to create image lock: %m");
3809 r
= copy_file(arg_image
, np
, O_EXCL
, arg_read_only
? 0400 : 0600, FS_NOCOW_FL
, COPY_REFLINK
);
3811 r
= log_error_errno(r
, "Failed to copy image file: %m");
3819 remove_image
= true;
3821 r
= image_path_lock(arg_image
, (arg_read_only
? LOCK_SH
: LOCK_EX
) | LOCK_NB
, &tree_global_lock
, &tree_local_lock
);
3823 r
= log_error_errno(r
, "Disk image %s is currently busy.", arg_image
);
3827 r
= log_error_errno(r
, "Failed to create image lock: %m");
3831 if (!arg_root_hash
) {
3832 r
= root_hash_load(arg_image
, &arg_root_hash
, &arg_root_hash_size
);
3834 log_error_errno(r
, "Failed to load root hash file for %s: %m", arg_image
);
3840 if (!mkdtemp(tmprootdir
)) {
3841 r
= log_error_errno(errno
, "Failed to create temporary directory: %m");
3845 remove_tmprootdir
= true;
3847 arg_directory
= strdup(tmprootdir
);
3848 if (!arg_directory
) {
3853 r
= loop_device_make_by_path(arg_image
, arg_read_only
? O_RDONLY
: O_RDWR
, &loop
);
3855 log_error_errno(r
, "Failed to set up loopback block device: %m");
3861 arg_root_hash
, arg_root_hash_size
,
3862 DISSECT_IMAGE_REQUIRE_ROOT
,
3865 log_error_errno(r
, "Could not find a suitable file system or partition table in image: %s", arg_image
);
3867 log_notice("Note that the disk image needs to\n"
3868 " a) either contain only a single MBR partition of type 0x83 that is marked bootable\n"
3869 " b) or contain a single GPT partition of type 0FC63DAF-8483-4772-8E79-3D69D8477DE4\n"
3870 " c) or follow http://www.freedesktop.org/wiki/Specifications/DiscoverablePartitionsSpec/\n"
3871 " d) or contain a file system without a partition table\n"
3872 "in order to be bootable with systemd-nspawn.");
3875 if (r
== -EADDRNOTAVAIL
) {
3876 log_error_errno(r
, "No root partition for specified root hash found.");
3879 if (r
== -EOPNOTSUPP
) {
3880 log_error_errno(r
, "--image= is not supported, compiled without blkid support.");
3883 if (r
== -EPROTONOSUPPORT
) {
3884 log_error_errno(r
, "Device is loopback block device with partition scanning turned off, please turn it on.");
3888 log_error_errno(r
, "Failed to dissect image: %m");
3892 if (!arg_root_hash
&& dissected_image
->can_verity
)
3893 log_notice("Note: image %s contains verity information, but no root hash specified! Proceeding without integrity checking.", arg_image
);
3895 r
= dissected_image_decrypt_interactively(dissected_image
, NULL
, arg_root_hash
, arg_root_hash_size
, 0, &decrypted_image
);
3899 /* Now that we mounted the image, let's try to remove it again, if it is ephemeral */
3900 if (remove_image
&& unlink(arg_image
) >= 0)
3901 remove_image
= false;
3904 r
= custom_mount_prepare_all(arg_directory
, arg_custom_mounts
, arg_n_custom_mounts
);
3908 r
= detect_unified_cgroup_hierarchy(arg_directory
);
3913 isatty(STDIN_FILENO
) > 0 &&
3914 isatty(STDOUT_FILENO
) > 0;
3916 master
= posix_openpt(O_RDWR
|O_NOCTTY
|O_CLOEXEC
|O_NDELAY
);
3918 r
= log_error_errno(errno
, "Failed to acquire pseudo tty: %m");
3922 r
= ptsname_malloc(master
, &console
);
3924 r
= log_error_errno(r
, "Failed to determine tty name: %m");
3928 if (arg_selinux_apifs_context
) {
3929 r
= mac_selinux_apply(console
, arg_selinux_apifs_context
);
3934 if (unlockpt(master
) < 0) {
3935 r
= log_error_errno(errno
, "Failed to unlock tty: %m");
3940 log_info("Spawning container %s on %s.\nPress ^] three times within 1s to kill container.",
3941 arg_machine
, arg_image
?: arg_directory
);
3943 assert_se(sigprocmask_many(SIG_BLOCK
, NULL
, SIGCHLD
, SIGWINCH
, SIGTERM
, SIGINT
, -1) >= 0);
3945 if (prctl(PR_SET_CHILD_SUBREAPER
, 1) < 0) {
3946 r
= log_error_errno(errno
, "Failed to become subreaper: %m");
3954 interactive
, secondary
,
3956 veth_name
, &veth_created
,
3965 r
== 0 && ret
== EXIT_FORCE_RESTART
? "STOPPING=1\nSTATUS=Restarting..." :
3966 "STOPPING=1\nSTATUS=Terminating...");
3969 (void) kill(pid
, SIGKILL
);
3971 /* Try to flush whatever is still queued in the pty */
3973 (void) copy_bytes(master
, STDOUT_FILENO
, (uint64_t) -1, 0);
3974 master
= safe_close(master
);
3978 (void) wait_for_terminate(pid
, NULL
);
3980 if (remove_directory
&& arg_directory
) {
3983 k
= rm_rf(arg_directory
, REMOVE_ROOT
|REMOVE_PHYSICAL
|REMOVE_SUBVOLUME
);
3985 log_warning_errno(k
, "Cannot remove '%s', ignoring: %m", arg_directory
);
3988 if (remove_image
&& arg_image
) {
3989 if (unlink(arg_image
) < 0)
3990 log_warning_errno(errno
, "Can't remove image file '%s', ignoring: %m", arg_image
);
3993 if (remove_tmprootdir
) {
3994 if (rmdir(tmprootdir
) < 0)
3995 log_debug_errno(errno
, "Can't remove temporary root directory '%s', ignoring: %m", tmprootdir
);
4001 p
= strjoina("/run/systemd/nspawn/propagate/", arg_machine
);
4002 (void) rm_rf(p
, REMOVE_ROOT
);
4005 expose_port_flush(arg_expose_ports
, &exposed
);
4008 (void) remove_veth_links(veth_name
, arg_network_veth_extra
);
4009 (void) remove_bridge(arg_network_zone
);
4011 free(arg_directory
);
4016 free(arg_pivot_root_new
);
4017 free(arg_pivot_root_old
);
4019 strv_free(arg_setenv
);
4020 free(arg_network_bridge
);
4021 strv_free(arg_network_interfaces
);
4022 strv_free(arg_network_macvlan
);
4023 strv_free(arg_network_ipvlan
);
4024 strv_free(arg_network_veth_extra
);
4025 strv_free(arg_parameters
);
4026 custom_mount_free_all(arg_custom_mounts
, arg_n_custom_mounts
);
4027 expose_port_free_all(arg_expose_ports
);
4028 free(arg_root_hash
);
4030 return r
< 0 ? EXIT_FAILURE
: ret
;