2 This file is part of systemd.
4 Copyright 2010 Lennart Poettering
6 systemd is free software; you can redistribute it and/or modify it
7 under the terms of the GNU Lesser General Public License as published by
8 the Free Software Foundation; either version 2.1 of the License, or
9 (at your option) any later version.
11 systemd is distributed in the hope that it will be useful, but
12 WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 Lesser General Public License for more details.
16 You should have received a copy of the GNU Lesser General Public License
17 along with systemd; If not, see <http://www.gnu.org/licenses/>.
26 #include <linux/loop.h>
30 #include <selinux/selinux.h>
37 #include <sys/mount.h>
38 #include <sys/personality.h>
39 #include <sys/prctl.h>
40 #include <sys/types.h>
45 #include "sd-daemon.h"
48 #include "alloc-util.h"
50 #include "base-filesystem.h"
51 #include "blkid-util.h"
52 #include "btrfs-util.h"
55 #include "capability-util.h"
56 #include "cgroup-util.h"
58 #include "dev-setup.h"
59 #include "dissect-image.h"
64 #include "format-util.h"
67 #include "hexdecoct.h"
68 #include "hostname-util.h"
69 #include "id128-util.h"
71 #include "loop-util.h"
72 #include "loopback-setup.h"
73 #include "machine-image.h"
77 #include "mount-util.h"
78 #include "netlink-util.h"
79 #include "nspawn-cgroup.h"
80 #include "nspawn-expose-ports.h"
81 #include "nspawn-mount.h"
82 #include "nspawn-network.h"
83 #include "nspawn-patch-uid.h"
84 #include "nspawn-register.h"
85 #include "nspawn-seccomp.h"
86 #include "nspawn-settings.h"
87 #include "nspawn-setuid.h"
88 #include "nspawn-stub-pid1.h"
89 #include "parse-util.h"
90 #include "path-util.h"
91 #include "process-util.h"
93 #include "random-util.h"
94 #include "raw-clone.h"
96 #include "selinux-util.h"
97 #include "signal-util.h"
98 #include "socket-util.h"
99 #include "stat-util.h"
100 #include "stdio-util.h"
101 #include "string-util.h"
103 #include "terminal-util.h"
104 #include "udev-util.h"
105 #include "umask-util.h"
106 #include "user-util.h"
109 /* Note that devpts's gid= parameter parses GIDs as signed values, hence we stay away from the upper half of the 32bit
110 * UID range here. We leave a bit of room at the lower end and a lot of room at the upper end, so that other subsystems
111 * may have their own allocation ranges too. */
112 #define UID_SHIFT_PICK_MIN ((uid_t) UINT32_C(0x00080000))
113 #define UID_SHIFT_PICK_MAX ((uid_t) UINT32_C(0x6FFF0000))
115 /* nspawn is listening on the socket at the path in the constant nspawn_notify_socket_path
116 * nspawn_notify_socket_path is relative to the container
117 * the init process in the container pid can send messages to nspawn following the sd_notify(3) protocol */
118 #define NSPAWN_NOTIFY_SOCKET_PATH "/run/systemd/nspawn/notify"
120 #define EXIT_FORCE_RESTART 133
122 typedef enum ContainerStatus
{
123 CONTAINER_TERMINATED
,
127 typedef enum LinkJournal
{
134 static char *arg_directory
= NULL
;
135 static char *arg_template
= NULL
;
136 static char *arg_chdir
= NULL
;
137 static char *arg_pivot_root_new
= NULL
;
138 static char *arg_pivot_root_old
= NULL
;
139 static char *arg_user
= NULL
;
140 static sd_id128_t arg_uuid
= {};
141 static char *arg_machine
= NULL
;
142 static const char *arg_selinux_context
= NULL
;
143 static const char *arg_selinux_apifs_context
= NULL
;
144 static const char *arg_slice
= NULL
;
145 static bool arg_private_network
= false;
146 static bool arg_read_only
= false;
147 static StartMode arg_start_mode
= START_PID1
;
148 static bool arg_ephemeral
= false;
149 static LinkJournal arg_link_journal
= LINK_AUTO
;
150 static bool arg_link_journal_try
= false;
151 static uint64_t arg_caps_retain
=
152 (1ULL << CAP_AUDIT_CONTROL
) |
153 (1ULL << CAP_AUDIT_WRITE
) |
154 (1ULL << CAP_CHOWN
) |
155 (1ULL << CAP_DAC_OVERRIDE
) |
156 (1ULL << CAP_DAC_READ_SEARCH
) |
157 (1ULL << CAP_FOWNER
) |
158 (1ULL << CAP_FSETID
) |
159 (1ULL << CAP_IPC_OWNER
) |
161 (1ULL << CAP_LEASE
) |
162 (1ULL << CAP_LINUX_IMMUTABLE
) |
163 (1ULL << CAP_MKNOD
) |
164 (1ULL << CAP_NET_BIND_SERVICE
) |
165 (1ULL << CAP_NET_BROADCAST
) |
166 (1ULL << CAP_NET_RAW
) |
167 (1ULL << CAP_SETFCAP
) |
168 (1ULL << CAP_SETGID
) |
169 (1ULL << CAP_SETPCAP
) |
170 (1ULL << CAP_SETUID
) |
171 (1ULL << CAP_SYS_ADMIN
) |
172 (1ULL << CAP_SYS_BOOT
) |
173 (1ULL << CAP_SYS_CHROOT
) |
174 (1ULL << CAP_SYS_NICE
) |
175 (1ULL << CAP_SYS_PTRACE
) |
176 (1ULL << CAP_SYS_RESOURCE
) |
177 (1ULL << CAP_SYS_TTY_CONFIG
);
178 static CustomMount
*arg_custom_mounts
= NULL
;
179 static unsigned arg_n_custom_mounts
= 0;
180 static char **arg_setenv
= NULL
;
181 static bool arg_quiet
= false;
182 static bool arg_register
= true;
183 static bool arg_keep_unit
= false;
184 static char **arg_network_interfaces
= NULL
;
185 static char **arg_network_macvlan
= NULL
;
186 static char **arg_network_ipvlan
= NULL
;
187 static bool arg_network_veth
= false;
188 static char **arg_network_veth_extra
= NULL
;
189 static char *arg_network_bridge
= NULL
;
190 static char *arg_network_zone
= NULL
;
191 static unsigned long arg_personality
= PERSONALITY_INVALID
;
192 static char *arg_image
= NULL
;
193 static VolatileMode arg_volatile_mode
= VOLATILE_NO
;
194 static ExposePort
*arg_expose_ports
= NULL
;
195 static char **arg_property
= NULL
;
196 static UserNamespaceMode arg_userns_mode
= USER_NAMESPACE_NO
;
197 static uid_t arg_uid_shift
= UID_INVALID
, arg_uid_range
= 0x10000U
;
198 static bool arg_userns_chown
= false;
199 static int arg_kill_signal
= 0;
200 static CGroupUnified arg_unified_cgroup_hierarchy
= CGROUP_UNIFIED_UNKNOWN
;
201 static SettingsMask arg_settings_mask
= 0;
202 static int arg_settings_trusted
= -1;
203 static char **arg_parameters
= NULL
;
204 static const char *arg_container_service_name
= "systemd-nspawn";
205 static bool arg_notify_ready
= false;
206 static bool arg_use_cgns
= true;
207 static unsigned long arg_clone_ns_flags
= CLONE_NEWIPC
|CLONE_NEWPID
|CLONE_NEWUTS
;
208 static MountSettingsMask arg_mount_settings
= MOUNT_APPLY_APIVFS_RO
;
209 static void *arg_root_hash
= NULL
;
210 static size_t arg_root_hash_size
= 0;
211 static char **arg_syscall_whitelist
= NULL
;
212 static char **arg_syscall_blacklist
= NULL
;
214 static void help(void) {
215 printf("%s [OPTIONS...] [PATH] [ARGUMENTS...]\n\n"
216 "Spawn a minimal namespace container for debugging, testing and building.\n\n"
217 " -h --help Show this help\n"
218 " --version Print version string\n"
219 " -q --quiet Do not show status information\n"
220 " -D --directory=PATH Root directory for the container\n"
221 " --template=PATH Initialize root directory from template directory,\n"
223 " -x --ephemeral Run container with snapshot of root directory, and\n"
224 " remove it after exit\n"
225 " -i --image=PATH File system device or disk image for the container\n"
226 " --root-hash=HASH Specify verity root hash\n"
227 " -a --as-pid2 Maintain a stub init as PID1, invoke binary as PID2\n"
228 " -b --boot Boot up full system (i.e. invoke init)\n"
229 " --chdir=PATH Set working directory in the container\n"
230 " --pivot-root=PATH[:PATH]\n"
231 " Pivot root to given directory in the container\n"
232 " -u --user=USER Run the command under specified user or uid\n"
233 " -M --machine=NAME Set the machine name for the container\n"
234 " --uuid=UUID Set a specific machine UUID for the container\n"
235 " -S --slice=SLICE Place the container in the specified slice\n"
236 " --property=NAME=VALUE Set scope unit property\n"
237 " -U --private-users=pick Run within user namespace, autoselect UID/GID range\n"
238 " --private-users[=UIDBASE[:NUIDS]]\n"
239 " Similar, but with user configured UID/GID range\n"
240 " --private-users-chown Adjust OS tree ownership to private UID/GID range\n"
241 " --private-network Disable network in container\n"
242 " --network-interface=INTERFACE\n"
243 " Assign an existing network interface to the\n"
245 " --network-macvlan=INTERFACE\n"
246 " Create a macvlan network interface based on an\n"
247 " existing network interface to the container\n"
248 " --network-ipvlan=INTERFACE\n"
249 " Create a ipvlan network interface based on an\n"
250 " existing network interface to the container\n"
251 " -n --network-veth Add a virtual Ethernet connection between host\n"
253 " --network-veth-extra=HOSTIF[:CONTAINERIF]\n"
254 " Add an additional virtual Ethernet link between\n"
255 " host and container\n"
256 " --network-bridge=INTERFACE\n"
257 " Add a virtual Ethernet connection to the container\n"
258 " and attach it to an existing bridge on the host\n"
259 " --network-zone=NAME Similar, but attach the new interface to an\n"
260 " an automatically managed bridge interface\n"
261 " -p --port=[PROTOCOL:]HOSTPORT[:CONTAINERPORT]\n"
262 " Expose a container IP port on the host\n"
263 " -Z --selinux-context=SECLABEL\n"
264 " Set the SELinux security context to be used by\n"
265 " processes in the container\n"
266 " -L --selinux-apifs-context=SECLABEL\n"
267 " Set the SELinux security context to be used by\n"
268 " API/tmpfs file systems in the container\n"
269 " --capability=CAP In addition to the default, retain specified\n"
271 " --drop-capability=CAP Drop the specified capability from the default set\n"
272 " --system-call-filter=LIST|~LIST\n"
273 " Permit/prohibit specific system calls\n"
274 " --kill-signal=SIGNAL Select signal to use for shutting down PID 1\n"
275 " --link-journal=MODE Link up guest journal, one of no, auto, guest, \n"
276 " host, try-guest, try-host\n"
277 " -j Equivalent to --link-journal=try-guest\n"
278 " --read-only Mount the root directory read-only\n"
279 " --bind=PATH[:PATH[:OPTIONS]]\n"
280 " Bind mount a file or directory from the host into\n"
282 " --bind-ro=PATH[:PATH[:OPTIONS]\n"
283 " Similar, but creates a read-only bind mount\n"
284 " --tmpfs=PATH:[OPTIONS] Mount an empty tmpfs to the specified directory\n"
285 " --overlay=PATH[:PATH...]:PATH\n"
286 " Create an overlay mount from the host to \n"
288 " --overlay-ro=PATH[:PATH...]:PATH\n"
289 " Similar, but creates a read-only overlay mount\n"
290 " -E --setenv=NAME=VALUE Pass an environment variable to PID 1\n"
291 " --register=BOOLEAN Register container as machine\n"
292 " --keep-unit Do not register a scope for the machine, reuse\n"
293 " the service unit nspawn is running in\n"
294 " --volatile[=MODE] Run the system in volatile mode\n"
295 " --settings=BOOLEAN Load additional settings from .nspawn file\n"
296 " --notify-ready=BOOLEAN Receive notifications from the child init process\n"
297 , program_invocation_short_name
);
300 static int custom_mount_check_all(void) {
303 for (i
= 0; i
< arg_n_custom_mounts
; i
++) {
304 CustomMount
*m
= &arg_custom_mounts
[i
];
306 if (path_equal(m
->destination
, "/") && arg_userns_mode
!= USER_NAMESPACE_NO
) {
308 if (arg_userns_chown
) {
309 log_error("--private-users-chown may not be combined with custom root mounts.");
311 } else if (arg_uid_shift
== UID_INVALID
) {
312 log_error("--private-users with automatic UID shift may not be combined with custom root mounts.");
321 static int detect_unified_cgroup_hierarchy(const char *directory
) {
325 /* Allow the user to control whether the unified hierarchy is used */
326 e
= getenv("UNIFIED_CGROUP_HIERARCHY");
328 r
= parse_boolean(e
);
330 return log_error_errno(r
, "Failed to parse $UNIFIED_CGROUP_HIERARCHY.");
332 arg_unified_cgroup_hierarchy
= CGROUP_UNIFIED_ALL
;
334 arg_unified_cgroup_hierarchy
= CGROUP_UNIFIED_NONE
;
339 /* Otherwise inherit the default from the host system */
340 r
= cg_all_unified();
342 return log_error_errno(r
, "Failed to determine whether we are in all unified mode.");
344 /* Unified cgroup hierarchy support was added in 230. Unfortunately the detection
345 * routine only detects 231, so we'll have a false negative here for 230. */
346 r
= systemd_installation_has_version(directory
, 230);
348 return log_error_errno(r
, "Failed to determine systemd version in container: %m");
350 arg_unified_cgroup_hierarchy
= CGROUP_UNIFIED_ALL
;
352 arg_unified_cgroup_hierarchy
= CGROUP_UNIFIED_NONE
;
353 } else if (cg_unified_controller(SYSTEMD_CGROUP_CONTROLLER
) > 0) {
354 /* Mixed cgroup hierarchy support was added in 233 */
355 r
= systemd_installation_has_version(directory
, 233);
357 return log_error_errno(r
, "Failed to determine systemd version in container: %m");
359 arg_unified_cgroup_hierarchy
= CGROUP_UNIFIED_SYSTEMD
;
361 arg_unified_cgroup_hierarchy
= CGROUP_UNIFIED_NONE
;
363 arg_unified_cgroup_hierarchy
= CGROUP_UNIFIED_NONE
;
368 static void parse_share_ns_env(const char *name
, unsigned long ns_flag
) {
371 r
= getenv_bool(name
);
375 log_warning_errno(r
, "Failed to parse %s from environment, defaulting to false.", name
);
376 arg_clone_ns_flags
= (arg_clone_ns_flags
& ~ns_flag
) | (r
> 0 ? 0 : ns_flag
);
379 static void parse_mount_settings_env(void) {
383 e
= getenv("SYSTEMD_NSPAWN_API_VFS_WRITABLE");
387 if (streq(e
, "network")) {
388 arg_mount_settings
|= MOUNT_APPLY_APIVFS_RO
|MOUNT_APPLY_APIVFS_NETNS
;
392 r
= parse_boolean(e
);
394 log_warning_errno(r
, "Failed to parse SYSTEMD_NSPAWN_API_VFS_WRITABLE from environment, ignoring.");
398 SET_FLAG(arg_mount_settings
, MOUNT_APPLY_APIVFS_RO
, r
== 0);
399 SET_FLAG(arg_mount_settings
, MOUNT_APPLY_APIVFS_NETNS
, false);
402 static int parse_argv(int argc
, char *argv
[]) {
420 ARG_NETWORK_INTERFACE
,
425 ARG_NETWORK_VETH_EXTRA
,
435 ARG_PRIVATE_USERS_CHOWN
,
438 ARG_SYSTEM_CALL_FILTER
,
441 static const struct option options
[] = {
442 { "help", no_argument
, NULL
, 'h' },
443 { "version", no_argument
, NULL
, ARG_VERSION
},
444 { "directory", required_argument
, NULL
, 'D' },
445 { "template", required_argument
, NULL
, ARG_TEMPLATE
},
446 { "ephemeral", no_argument
, NULL
, 'x' },
447 { "user", required_argument
, NULL
, 'u' },
448 { "private-network", no_argument
, NULL
, ARG_PRIVATE_NETWORK
},
449 { "as-pid2", no_argument
, NULL
, 'a' },
450 { "boot", no_argument
, NULL
, 'b' },
451 { "uuid", required_argument
, NULL
, ARG_UUID
},
452 { "read-only", no_argument
, NULL
, ARG_READ_ONLY
},
453 { "capability", required_argument
, NULL
, ARG_CAPABILITY
},
454 { "drop-capability", required_argument
, NULL
, ARG_DROP_CAPABILITY
},
455 { "link-journal", required_argument
, NULL
, ARG_LINK_JOURNAL
},
456 { "bind", required_argument
, NULL
, ARG_BIND
},
457 { "bind-ro", required_argument
, NULL
, ARG_BIND_RO
},
458 { "tmpfs", required_argument
, NULL
, ARG_TMPFS
},
459 { "overlay", required_argument
, NULL
, ARG_OVERLAY
},
460 { "overlay-ro", required_argument
, NULL
, ARG_OVERLAY_RO
},
461 { "machine", required_argument
, NULL
, 'M' },
462 { "slice", required_argument
, NULL
, 'S' },
463 { "setenv", required_argument
, NULL
, 'E' },
464 { "selinux-context", required_argument
, NULL
, 'Z' },
465 { "selinux-apifs-context", required_argument
, NULL
, 'L' },
466 { "quiet", no_argument
, NULL
, 'q' },
467 { "share-system", no_argument
, NULL
, ARG_SHARE_SYSTEM
}, /* not documented */
468 { "register", required_argument
, NULL
, ARG_REGISTER
},
469 { "keep-unit", no_argument
, NULL
, ARG_KEEP_UNIT
},
470 { "network-interface", required_argument
, NULL
, ARG_NETWORK_INTERFACE
},
471 { "network-macvlan", required_argument
, NULL
, ARG_NETWORK_MACVLAN
},
472 { "network-ipvlan", required_argument
, NULL
, ARG_NETWORK_IPVLAN
},
473 { "network-veth", no_argument
, NULL
, 'n' },
474 { "network-veth-extra", required_argument
, NULL
, ARG_NETWORK_VETH_EXTRA
},
475 { "network-bridge", required_argument
, NULL
, ARG_NETWORK_BRIDGE
},
476 { "network-zone", required_argument
, NULL
, ARG_NETWORK_ZONE
},
477 { "personality", required_argument
, NULL
, ARG_PERSONALITY
},
478 { "image", required_argument
, NULL
, 'i' },
479 { "volatile", optional_argument
, NULL
, ARG_VOLATILE
},
480 { "port", required_argument
, NULL
, 'p' },
481 { "property", required_argument
, NULL
, ARG_PROPERTY
},
482 { "private-users", optional_argument
, NULL
, ARG_PRIVATE_USERS
},
483 { "private-users-chown", optional_argument
, NULL
, ARG_PRIVATE_USERS_CHOWN
},
484 { "kill-signal", required_argument
, NULL
, ARG_KILL_SIGNAL
},
485 { "settings", required_argument
, NULL
, ARG_SETTINGS
},
486 { "chdir", required_argument
, NULL
, ARG_CHDIR
},
487 { "pivot-root", required_argument
, NULL
, ARG_PIVOT_ROOT
},
488 { "notify-ready", required_argument
, NULL
, ARG_NOTIFY_READY
},
489 { "root-hash", required_argument
, NULL
, ARG_ROOT_HASH
},
490 { "system-call-filter", required_argument
, NULL
, ARG_SYSTEM_CALL_FILTER
},
496 uint64_t plus
= 0, minus
= 0;
497 bool mask_all_settings
= false, mask_no_settings
= false;
502 while ((c
= getopt_long(argc
, argv
, "+hD:u:abL:M:jS:Z:qi:xp:nUE:", options
, NULL
)) >= 0)
514 r
= parse_path_argument_and_warn(optarg
, false, &arg_directory
);
520 r
= parse_path_argument_and_warn(optarg
, false, &arg_template
);
526 r
= parse_path_argument_and_warn(optarg
, false, &arg_image
);
532 arg_ephemeral
= true;
536 r
= free_and_strdup(&arg_user
, optarg
);
540 arg_settings_mask
|= SETTING_USER
;
543 case ARG_NETWORK_ZONE
: {
546 j
= strappend("vz-", optarg
);
550 if (!ifname_valid(j
)) {
551 log_error("Network zone name not valid: %s", j
);
556 free(arg_network_zone
);
557 arg_network_zone
= j
;
559 arg_network_veth
= true;
560 arg_private_network
= true;
561 arg_settings_mask
|= SETTING_NETWORK
;
565 case ARG_NETWORK_BRIDGE
:
567 if (!ifname_valid(optarg
)) {
568 log_error("Bridge interface name not valid: %s", optarg
);
572 r
= free_and_strdup(&arg_network_bridge
, optarg
);
579 arg_network_veth
= true;
580 arg_private_network
= true;
581 arg_settings_mask
|= SETTING_NETWORK
;
584 case ARG_NETWORK_VETH_EXTRA
:
585 r
= veth_extra_parse(&arg_network_veth_extra
, optarg
);
587 return log_error_errno(r
, "Failed to parse --network-veth-extra= parameter: %s", optarg
);
589 arg_private_network
= true;
590 arg_settings_mask
|= SETTING_NETWORK
;
593 case ARG_NETWORK_INTERFACE
:
595 if (!ifname_valid(optarg
)) {
596 log_error("Network interface name not valid: %s", optarg
);
600 if (strv_extend(&arg_network_interfaces
, optarg
) < 0)
603 arg_private_network
= true;
604 arg_settings_mask
|= SETTING_NETWORK
;
607 case ARG_NETWORK_MACVLAN
:
609 if (!ifname_valid(optarg
)) {
610 log_error("MACVLAN network interface name not valid: %s", optarg
);
614 if (strv_extend(&arg_network_macvlan
, optarg
) < 0)
617 arg_private_network
= true;
618 arg_settings_mask
|= SETTING_NETWORK
;
621 case ARG_NETWORK_IPVLAN
:
623 if (!ifname_valid(optarg
)) {
624 log_error("IPVLAN network interface name not valid: %s", optarg
);
628 if (strv_extend(&arg_network_ipvlan
, optarg
) < 0)
633 case ARG_PRIVATE_NETWORK
:
634 arg_private_network
= true;
635 arg_settings_mask
|= SETTING_NETWORK
;
639 if (arg_start_mode
== START_PID2
) {
640 log_error("--boot and --as-pid2 may not be combined.");
644 arg_start_mode
= START_BOOT
;
645 arg_settings_mask
|= SETTING_START_MODE
;
649 if (arg_start_mode
== START_BOOT
) {
650 log_error("--boot and --as-pid2 may not be combined.");
654 arg_start_mode
= START_PID2
;
655 arg_settings_mask
|= SETTING_START_MODE
;
659 r
= sd_id128_from_string(optarg
, &arg_uuid
);
661 return log_error_errno(r
, "Invalid UUID: %s", optarg
);
663 if (sd_id128_is_null(arg_uuid
)) {
664 log_error("Machine UUID may not be all zeroes.");
668 arg_settings_mask
|= SETTING_MACHINE_ID
;
677 arg_machine
= mfree(arg_machine
);
679 if (!machine_name_is_valid(optarg
)) {
680 log_error("Invalid machine name: %s", optarg
);
684 r
= free_and_strdup(&arg_machine
, optarg
);
691 arg_selinux_context
= optarg
;
695 arg_selinux_apifs_context
= optarg
;
699 arg_read_only
= true;
700 arg_settings_mask
|= SETTING_READ_ONLY
;
704 case ARG_DROP_CAPABILITY
: {
707 _cleanup_free_
char *t
= NULL
;
709 r
= extract_first_word(&p
, &t
, ",", 0);
711 return log_error_errno(r
, "Failed to parse capability %s.", t
);
716 if (streq(t
, "all")) {
717 if (c
== ARG_CAPABILITY
)
718 plus
= (uint64_t) -1;
720 minus
= (uint64_t) -1;
724 cap
= capability_from_name(t
);
726 log_error("Failed to parse capability %s.", t
);
730 if (c
== ARG_CAPABILITY
)
731 plus
|= 1ULL << (uint64_t) cap
;
733 minus
|= 1ULL << (uint64_t) cap
;
737 arg_settings_mask
|= SETTING_CAPABILITY
;
742 arg_link_journal
= LINK_GUEST
;
743 arg_link_journal_try
= true;
746 case ARG_LINK_JOURNAL
:
747 if (streq(optarg
, "auto")) {
748 arg_link_journal
= LINK_AUTO
;
749 arg_link_journal_try
= false;
750 } else if (streq(optarg
, "no")) {
751 arg_link_journal
= LINK_NO
;
752 arg_link_journal_try
= false;
753 } else if (streq(optarg
, "guest")) {
754 arg_link_journal
= LINK_GUEST
;
755 arg_link_journal_try
= false;
756 } else if (streq(optarg
, "host")) {
757 arg_link_journal
= LINK_HOST
;
758 arg_link_journal_try
= false;
759 } else if (streq(optarg
, "try-guest")) {
760 arg_link_journal
= LINK_GUEST
;
761 arg_link_journal_try
= true;
762 } else if (streq(optarg
, "try-host")) {
763 arg_link_journal
= LINK_HOST
;
764 arg_link_journal_try
= true;
766 log_error("Failed to parse link journal mode %s", optarg
);
774 r
= bind_mount_parse(&arg_custom_mounts
, &arg_n_custom_mounts
, optarg
, c
== ARG_BIND_RO
);
776 return log_error_errno(r
, "Failed to parse --bind(-ro)= argument %s: %m", optarg
);
778 arg_settings_mask
|= SETTING_CUSTOM_MOUNTS
;
782 r
= tmpfs_mount_parse(&arg_custom_mounts
, &arg_n_custom_mounts
, optarg
);
784 return log_error_errno(r
, "Failed to parse --tmpfs= argument %s: %m", optarg
);
786 arg_settings_mask
|= SETTING_CUSTOM_MOUNTS
;
791 r
= overlay_mount_parse(&arg_custom_mounts
, &arg_n_custom_mounts
, optarg
, c
== ARG_OVERLAY_RO
);
792 if (r
== -EADDRNOTAVAIL
)
793 return log_error_errno(r
, "--overlay(-ro)= needs at least two colon-separated directories specified.");
795 return log_error_errno(r
, "Failed to parse --overlay(-ro)= argument %s: %m", optarg
);
797 arg_settings_mask
|= SETTING_CUSTOM_MOUNTS
;
803 if (!env_assignment_is_valid(optarg
)) {
804 log_error("Environment variable assignment '%s' is not valid.", optarg
);
808 n
= strv_env_set(arg_setenv
, optarg
);
812 strv_free(arg_setenv
);
815 arg_settings_mask
|= SETTING_ENVIRONMENT
;
823 case ARG_SHARE_SYSTEM
:
824 /* We don't officially support this anymore, except for compat reasons. People should use the
825 * $SYSTEMD_NSPAWN_SHARE_* environment variables instead. */
826 arg_clone_ns_flags
= 0;
830 r
= parse_boolean(optarg
);
832 log_error("Failed to parse --register= argument: %s", optarg
);
840 arg_keep_unit
= true;
843 case ARG_PERSONALITY
:
845 arg_personality
= personality_from_string(optarg
);
846 if (arg_personality
== PERSONALITY_INVALID
) {
847 log_error("Unknown or unsupported personality '%s'.", optarg
);
851 arg_settings_mask
|= SETTING_PERSONALITY
;
857 arg_volatile_mode
= VOLATILE_YES
;
861 m
= volatile_mode_from_string(optarg
);
863 log_error("Failed to parse --volatile= argument: %s", optarg
);
866 arg_volatile_mode
= m
;
869 arg_settings_mask
|= SETTING_VOLATILE_MODE
;
873 r
= expose_port_parse(&arg_expose_ports
, optarg
);
875 return log_error_errno(r
, "Duplicate port specification: %s", optarg
);
877 return log_error_errno(r
, "Failed to parse host port %s: %m", optarg
);
879 arg_settings_mask
|= SETTING_EXPOSE_PORTS
;
883 if (strv_extend(&arg_property
, optarg
) < 0)
888 case ARG_PRIVATE_USERS
: {
893 else if (!in_charset(optarg
, DIGITS
))
894 /* do *not* parse numbers as booleans */
895 boolean
= parse_boolean(optarg
);
897 if (boolean
== false) {
898 /* no: User namespacing off */
899 arg_userns_mode
= USER_NAMESPACE_NO
;
900 arg_uid_shift
= UID_INVALID
;
901 arg_uid_range
= UINT32_C(0x10000);
902 } else if (boolean
== true) {
903 /* yes: User namespacing on, UID range is read from root dir */
904 arg_userns_mode
= USER_NAMESPACE_FIXED
;
905 arg_uid_shift
= UID_INVALID
;
906 arg_uid_range
= UINT32_C(0x10000);
907 } else if (streq(optarg
, "pick")) {
908 /* pick: User namespacing on, UID range is picked randomly */
909 arg_userns_mode
= USER_NAMESPACE_PICK
;
910 arg_uid_shift
= UID_INVALID
;
911 arg_uid_range
= UINT32_C(0x10000);
913 _cleanup_free_
char *buffer
= NULL
;
914 const char *range
, *shift
;
916 /* anything else: User namespacing on, UID range is explicitly configured */
918 range
= strchr(optarg
, ':');
920 buffer
= strndup(optarg
, range
- optarg
);
926 r
= safe_atou32(range
, &arg_uid_range
);
928 return log_error_errno(r
, "Failed to parse UID range \"%s\": %m", range
);
932 r
= parse_uid(shift
, &arg_uid_shift
);
934 return log_error_errno(r
, "Failed to parse UID \"%s\": %m", optarg
);
936 arg_userns_mode
= USER_NAMESPACE_FIXED
;
939 if (arg_uid_range
<= 0) {
940 log_error("UID range cannot be 0.");
944 arg_settings_mask
|= SETTING_USERNS
;
949 if (userns_supported()) {
950 arg_userns_mode
= USER_NAMESPACE_PICK
;
951 arg_uid_shift
= UID_INVALID
;
952 arg_uid_range
= UINT32_C(0x10000);
954 arg_settings_mask
|= SETTING_USERNS
;
959 case ARG_PRIVATE_USERS_CHOWN
:
960 arg_userns_chown
= true;
962 arg_settings_mask
|= SETTING_USERNS
;
965 case ARG_KILL_SIGNAL
:
966 arg_kill_signal
= signal_from_string_try_harder(optarg
);
967 if (arg_kill_signal
< 0) {
968 log_error("Cannot parse signal: %s", optarg
);
972 arg_settings_mask
|= SETTING_KILL_SIGNAL
;
977 /* no → do not read files
978 * yes → read files, do not override cmdline, trust only subset
979 * override → read files, override cmdline, trust only subset
980 * trusted → read files, do not override cmdline, trust all
983 r
= parse_boolean(optarg
);
985 if (streq(optarg
, "trusted")) {
986 mask_all_settings
= false;
987 mask_no_settings
= false;
988 arg_settings_trusted
= true;
990 } else if (streq(optarg
, "override")) {
991 mask_all_settings
= false;
992 mask_no_settings
= true;
993 arg_settings_trusted
= -1;
995 return log_error_errno(r
, "Failed to parse --settings= argument: %s", optarg
);
998 mask_all_settings
= false;
999 mask_no_settings
= false;
1000 arg_settings_trusted
= -1;
1003 mask_all_settings
= true;
1004 mask_no_settings
= false;
1005 arg_settings_trusted
= false;
1011 if (!path_is_absolute(optarg
)) {
1012 log_error("Working directory %s is not an absolute path.", optarg
);
1016 r
= free_and_strdup(&arg_chdir
, optarg
);
1020 arg_settings_mask
|= SETTING_WORKING_DIRECTORY
;
1023 case ARG_PIVOT_ROOT
:
1024 r
= pivot_root_parse(&arg_pivot_root_new
, &arg_pivot_root_old
, optarg
);
1026 return log_error_errno(r
, "Failed to parse --pivot-root= argument %s: %m", optarg
);
1028 arg_settings_mask
|= SETTING_PIVOT_ROOT
;
1031 case ARG_NOTIFY_READY
:
1032 r
= parse_boolean(optarg
);
1034 log_error("%s is not a valid notify mode. Valid modes are: yes, no, and ready.", optarg
);
1037 arg_notify_ready
= r
;
1038 arg_settings_mask
|= SETTING_NOTIFY_READY
;
1041 case ARG_ROOT_HASH
: {
1045 r
= unhexmem(optarg
, strlen(optarg
), &k
, &l
);
1047 return log_error_errno(r
, "Failed to parse root hash: %s", optarg
);
1048 if (l
< sizeof(sd_id128_t
)) {
1049 log_error("Root hash must be at least 128bit long: %s", optarg
);
1054 free(arg_root_hash
);
1056 arg_root_hash_size
= l
;
1060 case ARG_SYSTEM_CALL_FILTER
: {
1064 negative
= optarg
[0] == '~';
1065 items
= negative
? optarg
+ 1 : optarg
;
1068 _cleanup_free_
char *word
= NULL
;
1070 r
= extract_first_word(&items
, &word
, NULL
, 0);
1076 return log_error_errno(r
, "Failed to parse system call filter: %m");
1079 r
= strv_extend(&arg_syscall_blacklist
, word
);
1081 r
= strv_extend(&arg_syscall_whitelist
, word
);
1086 arg_settings_mask
|= SETTING_SYSCALL_FILTER
;
1094 assert_not_reached("Unhandled option");
1097 parse_share_ns_env("SYSTEMD_NSPAWN_SHARE_NS_IPC", CLONE_NEWIPC
);
1098 parse_share_ns_env("SYSTEMD_NSPAWN_SHARE_NS_PID", CLONE_NEWPID
);
1099 parse_share_ns_env("SYSTEMD_NSPAWN_SHARE_NS_UTS", CLONE_NEWUTS
);
1100 parse_share_ns_env("SYSTEMD_NSPAWN_SHARE_SYSTEM", CLONE_NEWIPC
|CLONE_NEWPID
|CLONE_NEWUTS
);
1102 if (arg_userns_mode
!= USER_NAMESPACE_NO
)
1103 arg_mount_settings
|= MOUNT_USE_USERNS
;
1105 if (arg_private_network
)
1106 arg_mount_settings
|= MOUNT_APPLY_APIVFS_NETNS
;
1108 parse_mount_settings_env();
1110 if (!(arg_clone_ns_flags
& CLONE_NEWPID
) ||
1111 !(arg_clone_ns_flags
& CLONE_NEWUTS
)) {
1112 arg_register
= false;
1113 if (arg_start_mode
!= START_PID1
) {
1114 log_error("--boot cannot be used without namespacing.");
1119 if (arg_userns_mode
== USER_NAMESPACE_PICK
)
1120 arg_userns_chown
= true;
1122 if (arg_keep_unit
&& arg_register
&& cg_pid_get_owner_uid(0, NULL
) >= 0) {
1123 log_error("--keep-unit --register=yes may not be used when invoked from a user session.");
1127 if (arg_directory
&& arg_image
) {
1128 log_error("--directory= and --image= may not be combined.");
1132 if (arg_template
&& arg_image
) {
1133 log_error("--template= and --image= may not be combined.");
1137 if (arg_ephemeral
&& arg_template
&& !arg_directory
) {
1138 /* User asked for ephemeral execution but specified --template= instead of --directory=. Semantically
1139 * such an invocation makes some sense, see https://github.com/systemd/systemd/issues/3667. Let's
1140 * accept this here, and silently make "--ephemeral --template=" equivalent to "--ephemeral
1143 arg_directory
= arg_template
;
1144 arg_template
= NULL
;
1147 if (arg_template
&& !(arg_directory
|| arg_machine
)) {
1148 log_error("--template= needs --directory= or --machine=.");
1152 if (arg_ephemeral
&& arg_template
) {
1153 log_error("--ephemeral and --template= may not be combined.");
1157 if (arg_ephemeral
&& !IN_SET(arg_link_journal
, LINK_NO
, LINK_AUTO
)) {
1158 log_error("--ephemeral and --link-journal= may not be combined.");
1162 if (arg_userns_mode
!= USER_NAMESPACE_NO
&& !userns_supported()) {
1163 log_error("--private-users= is not supported, kernel compiled without user namespace support.");
1167 if (arg_userns_chown
&& arg_read_only
) {
1168 log_error("--read-only and --private-users-chown may not be combined.");
1172 if (arg_network_bridge
&& arg_network_zone
) {
1173 log_error("--network-bridge= and --network-zone= may not be combined.");
1177 if (argc
> optind
) {
1178 arg_parameters
= strv_copy(argv
+ optind
);
1179 if (!arg_parameters
)
1182 arg_settings_mask
|= SETTING_START_MODE
;
1185 /* Load all settings from .nspawn files */
1186 if (mask_no_settings
)
1187 arg_settings_mask
= 0;
1189 /* Don't load any settings from .nspawn files */
1190 if (mask_all_settings
)
1191 arg_settings_mask
= _SETTINGS_MASK_ALL
;
1193 arg_caps_retain
= (arg_caps_retain
| plus
| (arg_private_network
? 1ULL << CAP_NET_ADMIN
: 0)) & ~minus
;
1195 r
= cg_unified_flush();
1197 return log_error_errno(r
, "Failed to determine whether the unified cgroups hierarchy is used: %m");
1199 e
= getenv("SYSTEMD_NSPAWN_CONTAINER_SERVICE");
1201 arg_container_service_name
= e
;
1203 r
= getenv_bool("SYSTEMD_NSPAWN_USE_CGNS");
1205 arg_use_cgns
= cg_ns_supported();
1209 r
= custom_mount_check_all();
1216 static int verify_arguments(void) {
1217 if (arg_userns_mode
!= USER_NAMESPACE_NO
&& (arg_mount_settings
& MOUNT_APPLY_APIVFS_NETNS
) && !arg_private_network
) {
1218 log_error("Invalid namespacing settings. Mounting sysfs with --private-users requires --private-network.");
1222 if (arg_userns_mode
!= USER_NAMESPACE_NO
&& !(arg_mount_settings
& MOUNT_APPLY_APIVFS_RO
)) {
1223 log_error("Cannot combine --private-users with read-write mounts.");
1227 if (arg_volatile_mode
!= VOLATILE_NO
&& arg_read_only
) {
1228 log_error("Cannot combine --read-only with --volatile. Note that --volatile already implies a read-only base hierarchy.");
1232 if (arg_expose_ports
&& !arg_private_network
) {
1233 log_error("Cannot use --port= without private networking.");
1238 if (arg_expose_ports
) {
1239 log_error("--port= is not supported, compiled without libiptc support.");
1244 if (arg_start_mode
== START_BOOT
&& arg_kill_signal
<= 0)
1245 arg_kill_signal
= SIGRTMIN
+3;
1250 static int userns_lchown(const char *p
, uid_t uid
, gid_t gid
) {
1253 if (arg_userns_mode
== USER_NAMESPACE_NO
)
1256 if (uid
== UID_INVALID
&& gid
== GID_INVALID
)
1259 if (uid
!= UID_INVALID
) {
1260 uid
+= arg_uid_shift
;
1262 if (uid
< arg_uid_shift
|| uid
>= arg_uid_shift
+ arg_uid_range
)
1266 if (gid
!= GID_INVALID
) {
1267 gid
+= (gid_t
) arg_uid_shift
;
1269 if (gid
< (gid_t
) arg_uid_shift
|| gid
>= (gid_t
) (arg_uid_shift
+ arg_uid_range
))
1273 if (lchown(p
, uid
, gid
) < 0)
1279 static int userns_mkdir(const char *root
, const char *path
, mode_t mode
, uid_t uid
, gid_t gid
) {
1282 q
= prefix_roota(root
, path
);
1283 if (mkdir(q
, mode
) < 0) {
1284 if (errno
== EEXIST
)
1289 return userns_lchown(q
, uid
, gid
);
1292 static int setup_timezone(const char *dest
) {
1293 _cleanup_free_
char *p
= NULL
, *q
= NULL
;
1294 const char *where
, *check
, *what
;
1300 /* Fix the timezone, if possible */
1301 r
= readlink_malloc("/etc/localtime", &p
);
1303 log_warning("host's /etc/localtime is not a symlink, not updating container timezone.");
1304 /* to handle warning, delete /etc/localtime and replace it
1305 * with a symbolic link to a time zone data file.
1308 * ln -s /usr/share/zoneinfo/UTC /etc/localtime
1313 z
= path_startswith(p
, "../usr/share/zoneinfo/");
1315 z
= path_startswith(p
, "/usr/share/zoneinfo/");
1317 log_warning("/etc/localtime does not point into /usr/share/zoneinfo/, not updating container timezone.");
1321 where
= prefix_roota(dest
, "/etc/localtime");
1322 r
= readlink_malloc(where
, &q
);
1324 y
= path_startswith(q
, "../usr/share/zoneinfo/");
1326 y
= path_startswith(q
, "/usr/share/zoneinfo/");
1328 /* Already pointing to the right place? Then do nothing .. */
1329 if (y
&& streq(y
, z
))
1333 check
= strjoina("/usr/share/zoneinfo/", z
);
1334 check
= prefix_roota(dest
, check
);
1335 if (laccess(check
, F_OK
) < 0) {
1336 log_warning("Timezone %s does not exist in container, not updating container timezone.", z
);
1340 if (unlink(where
) < 0 && errno
!= ENOENT
) {
1341 log_full_errno(IN_SET(errno
, EROFS
, EACCES
, EPERM
) ? LOG_DEBUG
: LOG_WARNING
, /* Don't complain on read-only images */
1343 "Failed to remove existing timezone info %s in container, ignoring: %m", where
);
1347 what
= strjoina("../usr/share/zoneinfo/", z
);
1348 if (symlink(what
, where
) < 0) {
1349 log_full_errno(IN_SET(errno
, EROFS
, EACCES
, EPERM
) ? LOG_DEBUG
: LOG_WARNING
,
1351 "Failed to correct timezone of container, ignoring: %m");
1355 r
= userns_lchown(where
, 0, 0);
1357 return log_warning_errno(r
, "Failed to chown /etc/localtime: %m");
1362 static int resolved_listening(void) {
1363 _cleanup_(sd_bus_flush_close_unrefp
) sd_bus
*bus
= NULL
;
1364 _cleanup_free_
char *dns_stub_listener_mode
= NULL
;
1367 /* Check if resolved is listening */
1369 r
= sd_bus_open_system(&bus
);
1373 r
= bus_name_has_owner(bus
, "org.freedesktop.resolve1", NULL
);
1377 r
= sd_bus_get_property_string(bus
,
1378 "org.freedesktop.resolve1",
1379 "/org/freedesktop/resolve1",
1380 "org.freedesktop.resolve1.Manager",
1383 &dns_stub_listener_mode
);
1387 return STR_IN_SET(dns_stub_listener_mode
, "udp", "yes");
1390 static int setup_resolv_conf(const char *dest
) {
1391 _cleanup_free_
char *resolved
= NULL
, *etc
= NULL
;
1397 if (arg_private_network
)
1400 r
= chase_symlinks("/etc", dest
, CHASE_PREFIX_ROOT
, &etc
);
1402 log_warning_errno(r
, "Failed to resolve /etc path in container, ignoring: %m");
1406 where
= strjoina(etc
, "/resolv.conf");
1407 found
= chase_symlinks(where
, dest
, CHASE_NONEXISTENT
, &resolved
);
1409 log_warning_errno(found
, "Failed to resolve /etc/resolv.conf path in container, ignoring: %m");
1413 if (access("/usr/lib/systemd/resolv.conf", F_OK
) >= 0 &&
1414 resolved_listening() > 0) {
1416 /* resolved is enabled on the host. In this, case bind mount its static resolv.conf file into the
1417 * container, so that the container can use the host's resolver. Given that network namespacing is
1418 * disabled it's only natural of the container also uses the host's resolver. It also has the big
1419 * advantage that the container will be able to follow the host's DNS server configuration changes
1422 if (found
== 0) /* missing? */
1423 (void) touch(resolved
);
1425 r
= mount_verbose(LOG_DEBUG
, "/usr/lib/systemd/resolv.conf", resolved
, NULL
, MS_BIND
, NULL
);
1427 return mount_verbose(LOG_ERR
, NULL
, resolved
, NULL
, MS_BIND
|MS_REMOUNT
|MS_RDONLY
|MS_NOSUID
|MS_NODEV
, NULL
);
1430 /* If that didn't work, let's copy the file */
1431 r
= copy_file("/etc/resolv.conf", where
, O_TRUNC
|O_NOFOLLOW
, 0644, 0, COPY_REFLINK
);
1433 /* If the file already exists as symlink, let's suppress the warning, under the assumption that
1434 * resolved or something similar runs inside and the symlink points there.
1436 * If the disk image is read-only, there's also no point in complaining.
1438 log_full_errno(IN_SET(r
, -ELOOP
, -EROFS
, -EACCES
, -EPERM
) ? LOG_DEBUG
: LOG_WARNING
, r
,
1439 "Failed to copy /etc/resolv.conf to %s, ignoring: %m", where
);
1443 r
= userns_lchown(where
, 0, 0);
1445 log_warning_errno(r
, "Failed to chown /etc/resolv.conf, ignoring: %m");
1450 static int setup_boot_id(const char *dest
) {
1451 sd_id128_t rnd
= SD_ID128_NULL
;
1452 const char *from
, *to
;
1455 /* Generate a new randomized boot ID, so that each boot-up of
1456 * the container gets a new one */
1458 from
= prefix_roota(dest
, "/run/proc-sys-kernel-random-boot-id");
1459 to
= prefix_roota(dest
, "/proc/sys/kernel/random/boot_id");
1461 r
= sd_id128_randomize(&rnd
);
1463 return log_error_errno(r
, "Failed to generate random boot id: %m");
1465 r
= id128_write(from
, ID128_UUID
, rnd
, false);
1467 return log_error_errno(r
, "Failed to write boot id: %m");
1469 r
= mount_verbose(LOG_ERR
, from
, to
, NULL
, MS_BIND
, NULL
);
1471 r
= mount_verbose(LOG_ERR
, NULL
, to
, NULL
,
1472 MS_BIND
|MS_REMOUNT
|MS_RDONLY
|MS_NOSUID
|MS_NODEV
, NULL
);
1474 (void) unlink(from
);
1478 static int copy_devnodes(const char *dest
) {
1480 static const char devnodes
[] =
1491 _cleanup_umask_ mode_t u
;
1497 /* Create /dev/net, so that we can create /dev/net/tun in it */
1498 if (userns_mkdir(dest
, "/dev/net", 0755, 0, 0) < 0)
1499 return log_error_errno(r
, "Failed to create /dev/net directory: %m");
1501 NULSTR_FOREACH(d
, devnodes
) {
1502 _cleanup_free_
char *from
= NULL
, *to
= NULL
;
1505 from
= strappend("/dev/", d
);
1506 to
= prefix_root(dest
, from
);
1508 if (stat(from
, &st
) < 0) {
1510 if (errno
!= ENOENT
)
1511 return log_error_errno(errno
, "Failed to stat %s: %m", from
);
1513 } else if (!S_ISCHR(st
.st_mode
) && !S_ISBLK(st
.st_mode
)) {
1515 log_error("%s is not a char or block device, cannot copy.", from
);
1519 if (mknod(to
, st
.st_mode
, st
.st_rdev
) < 0) {
1520 /* Explicitly warn the user when /dev is already populated. */
1521 if (errno
== EEXIST
)
1522 log_notice("%s/dev is pre-mounted and pre-populated. If a pre-mounted /dev is provided it needs to be an unpopulated file system.", dest
);
1524 return log_error_errno(errno
, "mknod(%s) failed: %m", to
);
1526 /* Some systems abusively restrict mknod but
1527 * allow bind mounts. */
1530 return log_error_errno(r
, "touch (%s) failed: %m", to
);
1531 r
= mount_verbose(LOG_DEBUG
, from
, to
, NULL
, MS_BIND
, NULL
);
1533 return log_error_errno(r
, "Both mknod and bind mount (%s) failed: %m", to
);
1536 r
= userns_lchown(to
, 0, 0);
1538 return log_error_errno(r
, "chown() of device node %s failed: %m", to
);
1545 static int setup_pts(const char *dest
) {
1546 _cleanup_free_
char *options
= NULL
;
1551 if (arg_selinux_apifs_context
)
1552 (void) asprintf(&options
,
1553 "newinstance,ptmxmode=0666,mode=620,gid=" GID_FMT
",context=\"%s\"",
1554 arg_uid_shift
+ TTY_GID
,
1555 arg_selinux_apifs_context
);
1558 (void) asprintf(&options
,
1559 "newinstance,ptmxmode=0666,mode=620,gid=" GID_FMT
,
1560 arg_uid_shift
+ TTY_GID
);
1565 /* Mount /dev/pts itself */
1566 p
= prefix_roota(dest
, "/dev/pts");
1567 if (mkdir(p
, 0755) < 0)
1568 return log_error_errno(errno
, "Failed to create /dev/pts: %m");
1569 r
= mount_verbose(LOG_ERR
, "devpts", p
, "devpts", MS_NOSUID
|MS_NOEXEC
, options
);
1572 r
= userns_lchown(p
, 0, 0);
1574 return log_error_errno(r
, "Failed to chown /dev/pts: %m");
1576 /* Create /dev/ptmx symlink */
1577 p
= prefix_roota(dest
, "/dev/ptmx");
1578 if (symlink("pts/ptmx", p
) < 0)
1579 return log_error_errno(errno
, "Failed to create /dev/ptmx symlink: %m");
1580 r
= userns_lchown(p
, 0, 0);
1582 return log_error_errno(r
, "Failed to chown /dev/ptmx: %m");
1584 /* And fix /dev/pts/ptmx ownership */
1585 p
= prefix_roota(dest
, "/dev/pts/ptmx");
1586 r
= userns_lchown(p
, 0, 0);
1588 return log_error_errno(r
, "Failed to chown /dev/pts/ptmx: %m");
1593 static int setup_dev_console(const char *dest
, const char *console
) {
1594 _cleanup_umask_ mode_t u
;
1603 r
= chmod_and_chown(console
, 0600, arg_uid_shift
, arg_uid_shift
);
1605 return log_error_errno(r
, "Failed to correct access mode for TTY: %m");
1607 /* We need to bind mount the right tty to /dev/console since
1608 * ptys can only exist on pts file systems. To have something
1609 * to bind mount things on we create a empty regular file. */
1611 to
= prefix_roota(dest
, "/dev/console");
1614 return log_error_errno(r
, "touch() for /dev/console failed: %m");
1616 return mount_verbose(LOG_ERR
, console
, to
, NULL
, MS_BIND
, NULL
);
1619 static int setup_keyring(void) {
1620 key_serial_t keyring
;
1622 /* Allocate a new session keyring for the container. This makes sure the keyring of the session systemd-nspawn
1623 * was invoked from doesn't leak into the container. Note that by default we block keyctl() and request_key()
1624 * anyway via seccomp so doing this operation isn't strictly necessary, but in case people explicitly whitelist
1625 * these system calls let's make sure we don't leak anything into the container. */
1627 keyring
= keyctl(KEYCTL_JOIN_SESSION_KEYRING
, 0, 0, 0, 0);
1628 if (keyring
== -1) {
1629 if (errno
== ENOSYS
)
1630 log_debug_errno(errno
, "Kernel keyring not supported, ignoring.");
1631 else if (IN_SET(errno
, EACCES
, EPERM
))
1632 log_debug_errno(errno
, "Kernel keyring access prohibited, ignoring.");
1634 return log_error_errno(errno
, "Setting up kernel keyring failed: %m");
1640 static int setup_kmsg(const char *dest
, int kmsg_socket
) {
1641 const char *from
, *to
;
1642 _cleanup_umask_ mode_t u
;
1645 assert(kmsg_socket
>= 0);
1649 /* We create the kmsg FIFO as /run/kmsg, but immediately
1650 * delete it after bind mounting it to /proc/kmsg. While FIFOs
1651 * on the reading side behave very similar to /proc/kmsg,
1652 * their writing side behaves differently from /dev/kmsg in
1653 * that writing blocks when nothing is reading. In order to
1654 * avoid any problems with containers deadlocking due to this
1655 * we simply make /dev/kmsg unavailable to the container. */
1656 from
= prefix_roota(dest
, "/run/kmsg");
1657 to
= prefix_roota(dest
, "/proc/kmsg");
1659 if (mkfifo(from
, 0600) < 0)
1660 return log_error_errno(errno
, "mkfifo() for /run/kmsg failed: %m");
1661 r
= mount_verbose(LOG_ERR
, from
, to
, NULL
, MS_BIND
, NULL
);
1665 fd
= open(from
, O_RDWR
|O_NDELAY
|O_CLOEXEC
);
1667 return log_error_errno(errno
, "Failed to open fifo: %m");
1669 /* Store away the fd in the socket, so that it stays open as
1670 * long as we run the child */
1671 r
= send_one_fd(kmsg_socket
, fd
, 0);
1675 return log_error_errno(r
, "Failed to send FIFO fd: %m");
1677 /* And now make the FIFO unavailable as /run/kmsg... */
1678 (void) unlink(from
);
1683 static int on_address_change(sd_netlink
*rtnl
, sd_netlink_message
*m
, void *userdata
) {
1684 union in_addr_union
*exposed
= userdata
;
1690 expose_port_execute(rtnl
, arg_expose_ports
, exposed
);
1694 static int setup_hostname(void) {
1696 if ((arg_clone_ns_flags
& CLONE_NEWUTS
) == 0)
1699 if (sethostname_idempotent(arg_machine
) < 0)
1705 static int setup_journal(const char *directory
) {
1707 _cleanup_free_
char *d
= NULL
;
1713 /* Don't link journals in ephemeral mode */
1717 if (arg_link_journal
== LINK_NO
)
1720 try = arg_link_journal_try
|| arg_link_journal
== LINK_AUTO
;
1722 r
= sd_id128_get_machine(&this_id
);
1724 return log_error_errno(r
, "Failed to retrieve machine ID: %m");
1726 if (sd_id128_equal(arg_uuid
, this_id
)) {
1727 log_full(try ? LOG_WARNING
: LOG_ERR
,
1728 "Host and machine ids are equal (%s): refusing to link journals", sd_id128_to_string(arg_uuid
, id
));
1734 r
= userns_mkdir(directory
, "/var", 0755, 0, 0);
1736 return log_error_errno(r
, "Failed to create /var: %m");
1738 r
= userns_mkdir(directory
, "/var/log", 0755, 0, 0);
1740 return log_error_errno(r
, "Failed to create /var/log: %m");
1742 r
= userns_mkdir(directory
, "/var/log/journal", 0755, 0, 0);
1744 return log_error_errno(r
, "Failed to create /var/log/journal: %m");
1746 (void) sd_id128_to_string(arg_uuid
, id
);
1748 p
= strjoina("/var/log/journal/", id
);
1749 q
= prefix_roota(directory
, p
);
1751 if (path_is_mount_point(p
, NULL
, 0) > 0) {
1755 log_error("%s: already a mount point, refusing to use for journal", p
);
1759 if (path_is_mount_point(q
, NULL
, 0) > 0) {
1763 log_error("%s: already a mount point, refusing to use for journal", q
);
1767 r
= readlink_and_make_absolute(p
, &d
);
1769 if (IN_SET(arg_link_journal
, LINK_GUEST
, LINK_AUTO
) &&
1772 r
= userns_mkdir(directory
, p
, 0755, 0, 0);
1774 log_warning_errno(r
, "Failed to create directory %s: %m", q
);
1779 return log_error_errno(errno
, "Failed to remove symlink %s: %m", p
);
1780 } else if (r
== -EINVAL
) {
1782 if (arg_link_journal
== LINK_GUEST
&&
1785 if (errno
== ENOTDIR
) {
1786 log_error("%s already exists and is neither a symlink nor a directory", p
);
1789 return log_error_errno(errno
, "Failed to remove %s: %m", p
);
1791 } else if (r
!= -ENOENT
)
1792 return log_error_errno(r
, "readlink(%s) failed: %m", p
);
1794 if (arg_link_journal
== LINK_GUEST
) {
1796 if (symlink(q
, p
) < 0) {
1798 log_debug_errno(errno
, "Failed to symlink %s to %s, skipping journal setup: %m", q
, p
);
1801 return log_error_errno(errno
, "Failed to symlink %s to %s: %m", q
, p
);
1804 r
= userns_mkdir(directory
, p
, 0755, 0, 0);
1806 log_warning_errno(r
, "Failed to create directory %s: %m", q
);
1810 if (arg_link_journal
== LINK_HOST
) {
1811 /* don't create parents here — if the host doesn't have
1812 * permanent journal set up, don't force it here */
1814 if (mkdir(p
, 0755) < 0 && errno
!= EEXIST
) {
1816 log_debug_errno(errno
, "Failed to create %s, skipping journal setup: %m", p
);
1819 return log_error_errno(errno
, "Failed to create %s: %m", p
);
1822 } else if (access(p
, F_OK
) < 0)
1825 if (dir_is_empty(q
) == 0)
1826 log_warning("%s is not empty, proceeding anyway.", q
);
1828 r
= userns_mkdir(directory
, p
, 0755, 0, 0);
1830 return log_error_errno(r
, "Failed to create %s: %m", q
);
1832 r
= mount_verbose(LOG_DEBUG
, p
, q
, NULL
, MS_BIND
, NULL
);
1834 return log_error_errno(errno
, "Failed to bind mount journal from host into guest: %m");
1839 static int drop_capabilities(void) {
1840 return capability_bounding_set_drop(arg_caps_retain
, false);
1843 static int reset_audit_loginuid(void) {
1844 _cleanup_free_
char *p
= NULL
;
1847 if ((arg_clone_ns_flags
& CLONE_NEWPID
) == 0)
1850 r
= read_one_line_file("/proc/self/loginuid", &p
);
1854 return log_error_errno(r
, "Failed to read /proc/self/loginuid: %m");
1856 /* Already reset? */
1857 if (streq(p
, "4294967295"))
1860 r
= write_string_file("/proc/self/loginuid", "4294967295", 0);
1863 "Failed to reset audit login UID. This probably means that your kernel is too\n"
1864 "old and you have audit enabled. Note that the auditing subsystem is known to\n"
1865 "be incompatible with containers on old kernels. Please make sure to upgrade\n"
1866 "your kernel or to off auditing with 'audit=0' on the kernel command line before\n"
1867 "using systemd-nspawn. Sleeping for 5s... (%m)");
1876 static int setup_propagate(const char *root
) {
1880 (void) mkdir_p("/run/systemd/nspawn/", 0755);
1881 (void) mkdir_p("/run/systemd/nspawn/propagate", 0600);
1882 p
= strjoina("/run/systemd/nspawn/propagate/", arg_machine
);
1883 (void) mkdir_p(p
, 0600);
1885 r
= userns_mkdir(root
, "/run/systemd", 0755, 0, 0);
1887 return log_error_errno(r
, "Failed to create /run/systemd: %m");
1889 r
= userns_mkdir(root
, "/run/systemd/nspawn", 0755, 0, 0);
1891 return log_error_errno(r
, "Failed to create /run/systemd/nspawn: %m");
1893 r
= userns_mkdir(root
, "/run/systemd/nspawn/incoming", 0600, 0, 0);
1895 return log_error_errno(r
, "Failed to create /run/systemd/nspawn/incoming: %m");
1897 q
= prefix_roota(root
, "/run/systemd/nspawn/incoming");
1898 r
= mount_verbose(LOG_ERR
, p
, q
, NULL
, MS_BIND
, NULL
);
1902 r
= mount_verbose(LOG_ERR
, NULL
, q
, NULL
, MS_BIND
|MS_REMOUNT
|MS_RDONLY
, NULL
);
1906 /* machined will MS_MOVE into that directory, and that's only
1907 * supported for non-shared mounts. */
1908 return mount_verbose(LOG_ERR
, NULL
, q
, NULL
, MS_SLAVE
, NULL
);
1911 static int setup_machine_id(const char *directory
) {
1912 const char *etc_machine_id
;
1916 /* If the UUID in the container is already set, then that's what counts, and we use. If it isn't set, and the
1917 * caller passed --uuid=, then we'll pass it in the $container_uuid env var to PID 1 of the container. The
1918 * assumption is that PID 1 will then write it to /etc/machine-id to make it persistent. If --uuid= is not
1919 * passed we generate a random UUID, and pass it via $container_uuid. In effect this means that /etc/machine-id
1920 * in the container and our idea of the container UUID will always be in sync (at least if PID 1 in the
1921 * container behaves nicely). */
1923 etc_machine_id
= prefix_roota(directory
, "/etc/machine-id");
1925 r
= id128_read(etc_machine_id
, ID128_PLAIN
, &id
);
1927 if (!IN_SET(r
, -ENOENT
, -ENOMEDIUM
)) /* If the file is missing or empty, we don't mind */
1928 return log_error_errno(r
, "Failed to read machine ID from container image: %m");
1930 if (sd_id128_is_null(arg_uuid
)) {
1931 r
= sd_id128_randomize(&arg_uuid
);
1933 return log_error_errno(r
, "Failed to acquire randomized machine UUID: %m");
1936 if (sd_id128_is_null(id
)) {
1937 log_error("Machine ID in container image is zero, refusing.");
1947 static int recursive_chown(const char *directory
, uid_t shift
, uid_t range
) {
1952 if (arg_userns_mode
== USER_NAMESPACE_NO
|| !arg_userns_chown
)
1955 r
= path_patch_uid(directory
, arg_uid_shift
, arg_uid_range
);
1956 if (r
== -EOPNOTSUPP
)
1957 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.");
1959 return log_error_errno(r
, "Upper 16 bits of root directory UID and GID do not match.");
1961 return log_error_errno(r
, "Failed to adjust UID/GID shift of OS tree: %m");
1963 log_debug("Root directory of image is already owned by the right UID/GID range, skipping recursive chown operation.");
1965 log_debug("Patched directory tree to match UID/GID range.");
1972 * < 0 : wait_for_terminate() failed to get the state of the
1973 * container, the container was terminated by a signal, or
1974 * failed for an unknown reason. No change is made to the
1975 * container argument.
1976 * > 0 : The program executed in the container terminated with an
1977 * error. The exit code of the program executed in the
1978 * container is returned. The container argument has been set
1979 * to CONTAINER_TERMINATED.
1980 * 0 : The container is being rebooted, has been shut down or exited
1981 * successfully. The container argument has been set to either
1982 * CONTAINER_TERMINATED or CONTAINER_REBOOTED.
1984 * That is, success is indicated by a return value of zero, and an
1985 * error is indicated by a non-zero value.
1987 static int wait_for_container(pid_t pid
, ContainerStatus
*container
) {
1991 r
= wait_for_terminate(pid
, &status
);
1993 return log_warning_errno(r
, "Failed to wait for container: %m");
1995 switch (status
.si_code
) {
1998 if (status
.si_status
== 0)
1999 log_full(arg_quiet
? LOG_DEBUG
: LOG_INFO
, "Container %s exited successfully.", arg_machine
);
2001 log_full(arg_quiet
? LOG_DEBUG
: LOG_INFO
, "Container %s failed with error code %i.", arg_machine
, status
.si_status
);
2003 *container
= CONTAINER_TERMINATED
;
2004 return status
.si_status
;
2007 if (status
.si_status
== SIGINT
) {
2008 log_full(arg_quiet
? LOG_DEBUG
: LOG_INFO
, "Container %s has been shut down.", arg_machine
);
2009 *container
= CONTAINER_TERMINATED
;
2012 } else if (status
.si_status
== SIGHUP
) {
2013 log_full(arg_quiet
? LOG_DEBUG
: LOG_INFO
, "Container %s is being rebooted.", arg_machine
);
2014 *container
= CONTAINER_REBOOTED
;
2021 log_error("Container %s terminated by signal %s.", arg_machine
, signal_to_string(status
.si_status
));
2025 log_error("Container %s failed due to unknown reason.", arg_machine
);
2030 static int on_orderly_shutdown(sd_event_source
*s
, const struct signalfd_siginfo
*si
, void *userdata
) {
2033 pid
= PTR_TO_PID(userdata
);
2035 if (kill(pid
, arg_kill_signal
) >= 0) {
2036 log_info("Trying to halt container. Send SIGTERM again to trigger immediate termination.");
2037 sd_event_source_set_userdata(s
, NULL
);
2042 sd_event_exit(sd_event_source_get_event(s
), 0);
2046 static int on_sigchld(sd_event_source
*s
, const struct signalfd_siginfo
*ssi
, void *userdata
) {
2049 if (waitid(P_ALL
, 0, &si
, WNOHANG
|WNOWAIT
|WEXITED
) < 0)
2050 return log_error_errno(errno
, "Failed to waitid(): %m");
2051 if (si
.si_pid
== 0) /* No pending children. */
2053 if (si
.si_pid
== PTR_TO_PID(userdata
)) {
2054 /* The main process we care for has exited. Return from
2055 * signal handler but leave the zombie. */
2056 sd_event_exit(sd_event_source_get_event(s
), 0);
2059 /* Reap all other children. */
2060 (void) waitid(P_PID
, si
.si_pid
, &si
, WNOHANG
|WEXITED
);
2066 static int determine_names(void) {
2069 if (arg_template
&& !arg_directory
&& arg_machine
) {
2071 /* If --template= was specified then we should not
2072 * search for a machine, but instead create a new one
2073 * in /var/lib/machine. */
2075 arg_directory
= strjoin("/var/lib/machines/", arg_machine
);
2080 if (!arg_image
&& !arg_directory
) {
2082 _cleanup_(image_unrefp
) Image
*i
= NULL
;
2084 r
= image_find(arg_machine
, &i
);
2086 return log_error_errno(r
, "Failed to find image for machine '%s': %m", arg_machine
);
2088 log_error("No image for machine '%s'.", arg_machine
);
2092 if (IN_SET(i
->type
, IMAGE_RAW
, IMAGE_BLOCK
))
2093 r
= free_and_strdup(&arg_image
, i
->path
);
2095 r
= free_and_strdup(&arg_directory
, i
->path
);
2100 arg_read_only
= arg_read_only
|| i
->read_only
;
2102 arg_directory
= get_current_dir_name();
2104 if (!arg_directory
&& !arg_image
) {
2105 log_error("Failed to determine path, please use -D or -i.");
2112 if (arg_directory
&& path_equal(arg_directory
, "/"))
2113 arg_machine
= gethostname_malloc();
2118 arg_machine
= strdup(basename(arg_image
));
2120 /* Truncate suffix if there is one */
2121 e
= endswith(arg_machine
, ".raw");
2125 arg_machine
= strdup(basename(arg_directory
));
2130 hostname_cleanup(arg_machine
);
2131 if (!machine_name_is_valid(arg_machine
)) {
2132 log_error("Failed to determine machine name automatically, please use -M.");
2136 if (arg_ephemeral
) {
2139 /* Add a random suffix when this is an
2140 * ephemeral machine, so that we can run many
2141 * instances at once without manually having
2142 * to specify -M each time. */
2144 if (asprintf(&b
, "%s-%016" PRIx64
, arg_machine
, random_u64()) < 0)
2155 static int chase_symlinks_and_update(char **p
, unsigned flags
) {
2164 r
= chase_symlinks(*p
, NULL
, flags
, &chased
);
2166 return log_error_errno(r
, "Failed to resolve path %s: %m", *p
);
2174 static int determine_uid_shift(const char *directory
) {
2177 if (arg_userns_mode
== USER_NAMESPACE_NO
) {
2182 if (arg_uid_shift
== UID_INVALID
) {
2185 r
= stat(directory
, &st
);
2187 return log_error_errno(errno
, "Failed to determine UID base of %s: %m", directory
);
2189 arg_uid_shift
= st
.st_uid
& UINT32_C(0xffff0000);
2191 if (arg_uid_shift
!= (st
.st_gid
& UINT32_C(0xffff0000))) {
2192 log_error("UID and GID base of %s don't match.", directory
);
2196 arg_uid_range
= UINT32_C(0x10000);
2199 if (arg_uid_shift
> (uid_t
) -1 - arg_uid_range
) {
2200 log_error("UID base too high for UID range.");
2207 static int inner_child(
2209 const char *directory
,
2215 _cleanup_free_
char *home
= NULL
;
2218 const char *envp
[] = {
2219 "PATH=" DEFAULT_PATH_SPLIT_USR
,
2220 NULL
, /* container */
2225 NULL
, /* container_uuid */
2226 NULL
, /* LISTEN_FDS */
2227 NULL
, /* LISTEN_PID */
2228 NULL
, /* NOTIFY_SOCKET */
2231 const char *exec_target
;
2233 _cleanup_strv_free_
char **env_use
= NULL
;
2238 assert(kmsg_socket
>= 0);
2240 if (arg_userns_mode
!= USER_NAMESPACE_NO
) {
2241 /* Tell the parent, that it now can write the UID map. */
2242 (void) barrier_place(barrier
); /* #1 */
2244 /* Wait until the parent wrote the UID map */
2245 if (!barrier_place_and_sync(barrier
)) { /* #2 */
2246 log_error("Parent died too early");
2251 r
= reset_uid_gid();
2253 return log_error_errno(r
, "Couldn't become new root: %m");
2256 arg_mount_settings
| MOUNT_IN_USERNS
,
2259 arg_selinux_apifs_context
);
2264 r
= mount_sysfs(NULL
, arg_mount_settings
);
2268 /* Wait until we are cgroup-ified, so that we
2269 * can mount the right cgroup path writable */
2270 if (!barrier_place_and_sync(barrier
)) { /* #3 */
2271 log_error("Parent died too early");
2275 if (arg_use_cgns
&& cg_ns_supported()) {
2276 r
= unshare(CLONE_NEWCGROUP
);
2278 return log_error_errno(errno
, "Failed to unshare cgroup namespace");
2281 arg_unified_cgroup_hierarchy
,
2282 arg_userns_mode
!= USER_NAMESPACE_NO
,
2285 arg_selinux_apifs_context
,
2290 r
= mount_systemd_cgroup_writable("", arg_unified_cgroup_hierarchy
);
2295 r
= setup_boot_id(NULL
);
2299 r
= setup_kmsg(NULL
, kmsg_socket
);
2302 kmsg_socket
= safe_close(kmsg_socket
);
2307 return log_error_errno(errno
, "setsid() failed: %m");
2309 if (arg_private_network
)
2312 if (arg_expose_ports
) {
2313 r
= expose_port_send_rtnl(rtnl_socket
);
2316 rtnl_socket
= safe_close(rtnl_socket
);
2319 r
= drop_capabilities();
2321 return log_error_errno(r
, "drop_capabilities() failed: %m");
2325 if (arg_personality
!= PERSONALITY_INVALID
) {
2326 r
= safe_personality(arg_personality
);
2328 return log_error_errno(r
, "personality() failed: %m");
2329 } else if (secondary
) {
2330 r
= safe_personality(PER_LINUX32
);
2332 return log_error_errno(r
, "personality() failed: %m");
2336 if (arg_selinux_context
)
2337 if (setexeccon(arg_selinux_context
) < 0)
2338 return log_error_errno(errno
, "setexeccon(\"%s\") failed: %m", arg_selinux_context
);
2341 r
= change_uid_gid(arg_user
, &home
);
2345 /* LXC sets container=lxc, so follow the scheme here */
2346 envp
[n_env
++] = strjoina("container=", arg_container_service_name
);
2348 envp
[n_env
] = strv_find_prefix(environ
, "TERM=");
2352 if ((asprintf((char**)(envp
+ n_env
++), "HOME=%s", home
? home
: "/root") < 0) ||
2353 (asprintf((char**)(envp
+ n_env
++), "USER=%s", arg_user
? arg_user
: "root") < 0) ||
2354 (asprintf((char**)(envp
+ n_env
++), "LOGNAME=%s", arg_user
? arg_user
: "root") < 0))
2357 assert(!sd_id128_is_null(arg_uuid
));
2359 if (asprintf((char**)(envp
+ n_env
++), "container_uuid=%s", id128_to_uuid_string(arg_uuid
, as_uuid
)) < 0)
2362 if (fdset_size(fds
) > 0) {
2363 r
= fdset_cloexec(fds
, false);
2365 return log_error_errno(r
, "Failed to unset O_CLOEXEC for file descriptors.");
2367 if ((asprintf((char **)(envp
+ n_env
++), "LISTEN_FDS=%u", fdset_size(fds
)) < 0) ||
2368 (asprintf((char **)(envp
+ n_env
++), "LISTEN_PID=1") < 0))
2371 if (asprintf((char **)(envp
+ n_env
++), "NOTIFY_SOCKET=%s", NSPAWN_NOTIFY_SOCKET_PATH
) < 0)
2374 env_use
= strv_env_merge(2, envp
, arg_setenv
);
2378 /* Let the parent know that we are ready and
2379 * wait until the parent is ready with the
2381 if (!barrier_place_and_sync(barrier
)) { /* #4 */
2382 log_error("Parent died too early");
2387 if (chdir(arg_chdir
) < 0)
2388 return log_error_errno(errno
, "Failed to change to specified working directory %s: %m", arg_chdir
);
2390 if (arg_start_mode
== START_PID2
) {
2391 r
= stub_pid1(arg_uuid
);
2396 /* Now, explicitly close the log, so that we
2397 * then can close all remaining fds. Closing
2398 * the log explicitly first has the benefit
2399 * that the logging subsystem knows about it,
2400 * and is thus ready to be reopened should we
2401 * need it again. Note that the other fds
2402 * closed here are at least the locking and
2405 (void) fdset_close_others(fds
);
2407 if (arg_start_mode
== START_BOOT
) {
2411 /* Automatically search for the init system */
2413 m
= strv_length(arg_parameters
);
2414 a
= newa(char*, m
+ 2);
2415 memcpy_safe(a
+ 1, arg_parameters
, m
* sizeof(char*));
2418 a
[0] = (char*) "/usr/lib/systemd/systemd";
2419 execve(a
[0], a
, env_use
);
2421 a
[0] = (char*) "/lib/systemd/systemd";
2422 execve(a
[0], a
, env_use
);
2424 a
[0] = (char*) "/sbin/init";
2425 execve(a
[0], a
, env_use
);
2427 exec_target
= "/usr/lib/systemd/systemd, /lib/systemd/systemd, /sbin/init";
2428 } else if (!strv_isempty(arg_parameters
)) {
2429 exec_target
= arg_parameters
[0];
2430 execvpe(arg_parameters
[0], arg_parameters
, env_use
);
2433 /* If we cannot change the directory, we'll end up in /, that is expected. */
2434 (void) chdir(home
?: "/root");
2436 execle("/bin/bash", "-bash", NULL
, env_use
);
2437 execle("/bin/sh", "-sh", NULL
, env_use
);
2439 exec_target
= "/bin/bash, /bin/sh";
2444 return log_error_errno(r
, "execv(%s) failed: %m", exec_target
);
2447 static int setup_sd_notify_child(void) {
2448 static const int one
= 1;
2450 union sockaddr_union sa
= {
2451 .sa
.sa_family
= AF_UNIX
,
2455 fd
= socket(AF_UNIX
, SOCK_DGRAM
|SOCK_CLOEXEC
|SOCK_NONBLOCK
, 0);
2457 return log_error_errno(errno
, "Failed to allocate notification socket: %m");
2459 (void) mkdir_parents(NSPAWN_NOTIFY_SOCKET_PATH
, 0755);
2460 (void) unlink(NSPAWN_NOTIFY_SOCKET_PATH
);
2462 strncpy(sa
.un
.sun_path
, NSPAWN_NOTIFY_SOCKET_PATH
, sizeof(sa
.un
.sun_path
)-1);
2463 r
= bind(fd
, &sa
.sa
, SOCKADDR_UN_LEN(sa
.un
));
2466 return log_error_errno(errno
, "bind(%s) failed: %m", sa
.un
.sun_path
);
2469 r
= userns_lchown(NSPAWN_NOTIFY_SOCKET_PATH
, 0, 0);
2472 return log_error_errno(r
, "Failed to chown " NSPAWN_NOTIFY_SOCKET_PATH
": %m");
2475 r
= setsockopt(fd
, SOL_SOCKET
, SO_PASSCRED
, &one
, sizeof(one
));
2478 return log_error_errno(errno
, "SO_PASSCRED failed: %m");
2484 static int outer_child(
2486 const char *directory
,
2487 const char *console
,
2488 DissectedImage
*dissected_image
,
2496 int uid_shift_socket
,
2502 _cleanup_close_
int fd
= -1;
2507 assert(pid_socket
>= 0);
2508 assert(uuid_socket
>= 0);
2509 assert(notify_socket
>= 0);
2510 assert(kmsg_socket
>= 0);
2512 if (prctl(PR_SET_PDEATHSIG
, SIGKILL
) < 0)
2513 return log_error_errno(errno
, "PR_SET_PDEATHSIG failed: %m");
2516 close_nointr(STDIN_FILENO
);
2517 close_nointr(STDOUT_FILENO
);
2518 close_nointr(STDERR_FILENO
);
2520 r
= open_terminal(console
, O_RDWR
);
2521 if (r
!= STDIN_FILENO
) {
2527 return log_error_errno(r
, "Failed to open console: %m");
2530 if (dup2(STDIN_FILENO
, STDOUT_FILENO
) != STDOUT_FILENO
||
2531 dup2(STDIN_FILENO
, STDERR_FILENO
) != STDERR_FILENO
)
2532 return log_error_errno(errno
, "Failed to duplicate console: %m");
2535 r
= reset_audit_loginuid();
2539 /* Mark everything as slave, so that we still
2540 * receive mounts from the real root, but don't
2541 * propagate mounts to the real root. */
2542 r
= mount_verbose(LOG_ERR
, NULL
, "/", NULL
, MS_SLAVE
|MS_REC
, NULL
);
2546 if (dissected_image
) {
2547 r
= dissected_image_mount(dissected_image
, directory
, DISSECT_IMAGE_DISCARD_ON_LOOP
|(arg_read_only
? DISSECT_IMAGE_READ_ONLY
: 0));
2552 r
= determine_uid_shift(directory
);
2556 if (arg_userns_mode
!= USER_NAMESPACE_NO
) {
2557 /* Let the parent know which UID shift we read from the image */
2558 l
= send(uid_shift_socket
, &arg_uid_shift
, sizeof(arg_uid_shift
), MSG_NOSIGNAL
);
2560 return log_error_errno(errno
, "Failed to send UID shift: %m");
2561 if (l
!= sizeof(arg_uid_shift
)) {
2562 log_error("Short write while sending UID shift.");
2566 if (arg_userns_mode
== USER_NAMESPACE_PICK
) {
2567 /* When we are supposed to pick the UID shift, the parent will check now whether the UID shift
2568 * we just read from the image is available. If yes, it will send the UID shift back to us, if
2569 * not it will pick a different one, and send it back to us. */
2571 l
= recv(uid_shift_socket
, &arg_uid_shift
, sizeof(arg_uid_shift
), 0);
2573 return log_error_errno(errno
, "Failed to recv UID shift: %m");
2574 if (l
!= sizeof(arg_uid_shift
)) {
2575 log_error("Short read while receiving UID shift.");
2580 log_info("Selected user namespace base " UID_FMT
" and range " UID_FMT
".", arg_uid_shift
, arg_uid_range
);
2583 /* Turn directory into bind mount */
2584 r
= mount_verbose(LOG_ERR
, directory
, directory
, NULL
, MS_BIND
|MS_REC
, NULL
);
2588 r
= setup_pivot_root(
2591 arg_pivot_root_old
);
2598 arg_userns_mode
!= USER_NAMESPACE_NO
,
2601 arg_selinux_context
);
2605 r
= setup_volatile_state(
2608 arg_userns_mode
!= USER_NAMESPACE_NO
,
2611 arg_selinux_context
);
2615 /* Mark everything as shared so our mounts get propagated down. This is
2616 * required to make new bind mounts available in systemd services
2617 * inside the containter that create a new mount namespace.
2618 * See https://github.com/systemd/systemd/issues/3860
2619 * Further submounts (such as /dev) done after this will inherit the
2620 * shared propagation mode. */
2621 r
= mount_verbose(LOG_ERR
, NULL
, directory
, NULL
, MS_SHARED
|MS_REC
, NULL
);
2625 r
= recursive_chown(directory
, arg_uid_shift
, arg_uid_range
);
2629 r
= base_filesystem_create(directory
, arg_uid_shift
, (gid_t
) arg_uid_shift
);
2633 if (arg_read_only
) {
2634 r
= bind_remount_recursive(directory
, true, NULL
);
2636 return log_error_errno(r
, "Failed to make tree read-only: %m");
2639 r
= mount_all(directory
,
2643 arg_selinux_apifs_context
);
2647 r
= copy_devnodes(directory
);
2651 dev_setup(directory
, arg_uid_shift
, arg_uid_shift
);
2653 r
= setup_pts(directory
);
2657 r
= setup_propagate(directory
);
2661 r
= setup_dev_console(directory
, console
);
2665 r
= setup_keyring();
2669 r
= setup_seccomp(arg_caps_retain
, arg_syscall_whitelist
, arg_syscall_blacklist
);
2673 r
= setup_timezone(directory
);
2677 r
= setup_resolv_conf(directory
);
2681 r
= setup_machine_id(directory
);
2685 r
= setup_journal(directory
);
2692 arg_n_custom_mounts
,
2693 arg_userns_mode
!= USER_NAMESPACE_NO
,
2696 arg_selinux_apifs_context
);
2700 if (!arg_use_cgns
|| !cg_ns_supported()) {
2703 arg_unified_cgroup_hierarchy
,
2704 arg_userns_mode
!= USER_NAMESPACE_NO
,
2707 arg_selinux_apifs_context
,
2713 r
= mount_move_root(directory
);
2715 return log_error_errno(r
, "Failed to move root directory: %m");
2717 fd
= setup_sd_notify_child();
2721 pid
= raw_clone(SIGCHLD
|CLONE_NEWNS
|
2722 arg_clone_ns_flags
|
2723 (arg_private_network
? CLONE_NEWNET
: 0) |
2724 (arg_userns_mode
!= USER_NAMESPACE_NO
? CLONE_NEWUSER
: 0));
2726 return log_error_errno(errno
, "Failed to fork inner child: %m");
2728 pid_socket
= safe_close(pid_socket
);
2729 uuid_socket
= safe_close(uuid_socket
);
2730 notify_socket
= safe_close(notify_socket
);
2731 uid_shift_socket
= safe_close(uid_shift_socket
);
2733 /* The inner child has all namespaces that are
2734 * requested, so that we all are owned by the user if
2735 * user namespaces are turned on. */
2737 r
= inner_child(barrier
, directory
, secondary
, kmsg_socket
, rtnl_socket
, fds
);
2739 _exit(EXIT_FAILURE
);
2741 _exit(EXIT_SUCCESS
);
2744 l
= send(pid_socket
, &pid
, sizeof(pid
), MSG_NOSIGNAL
);
2746 return log_error_errno(errno
, "Failed to send PID: %m");
2747 if (l
!= sizeof(pid
)) {
2748 log_error("Short write while sending PID.");
2752 l
= send(uuid_socket
, &arg_uuid
, sizeof(arg_uuid
), MSG_NOSIGNAL
);
2754 return log_error_errno(errno
, "Failed to send machine ID: %m");
2755 if (l
!= sizeof(arg_uuid
)) {
2756 log_error("Short write while sending machine ID.");
2760 l
= send_one_fd(notify_socket
, fd
, 0);
2762 return log_error_errno(errno
, "Failed to send notify fd: %m");
2764 pid_socket
= safe_close(pid_socket
);
2765 uuid_socket
= safe_close(uuid_socket
);
2766 notify_socket
= safe_close(notify_socket
);
2767 kmsg_socket
= safe_close(kmsg_socket
);
2768 rtnl_socket
= safe_close(rtnl_socket
);
2773 static int uid_shift_pick(uid_t
*shift
, LockFile
*ret_lock_file
) {
2774 unsigned n_tries
= 100;
2779 assert(ret_lock_file
);
2780 assert(arg_userns_mode
== USER_NAMESPACE_PICK
);
2781 assert(arg_uid_range
== 0x10000U
);
2785 (void) mkdir("/run/systemd/nspawn-uid", 0755);
2788 char lock_path
[strlen("/run/systemd/nspawn-uid/") + DECIMAL_STR_MAX(uid_t
) + 1];
2789 _cleanup_release_lock_file_ LockFile lf
= LOCK_FILE_INIT
;
2794 if (candidate
< UID_SHIFT_PICK_MIN
|| candidate
> UID_SHIFT_PICK_MAX
)
2796 if ((candidate
& UINT32_C(0xFFFF)) != 0)
2799 xsprintf(lock_path
, "/run/systemd/nspawn-uid/" UID_FMT
, candidate
);
2800 r
= make_lock_file(lock_path
, LOCK_EX
|LOCK_NB
, &lf
);
2801 if (r
== -EBUSY
) /* Range already taken by another nspawn instance */
2806 /* Make some superficial checks whether the range is currently known in the user database */
2807 if (getpwuid(candidate
))
2809 if (getpwuid(candidate
+ UINT32_C(0xFFFE)))
2811 if (getgrgid(candidate
))
2813 if (getgrgid(candidate
+ UINT32_C(0xFFFE)))
2816 *ret_lock_file
= lf
;
2817 lf
= (struct LockFile
) LOCK_FILE_INIT
;
2822 random_bytes(&candidate
, sizeof(candidate
));
2823 candidate
= (candidate
% (UID_SHIFT_PICK_MAX
- UID_SHIFT_PICK_MIN
)) + UID_SHIFT_PICK_MIN
;
2824 candidate
&= (uid_t
) UINT32_C(0xFFFF0000);
2828 static int setup_uid_map(pid_t pid
) {
2829 char uid_map
[strlen("/proc//uid_map") + DECIMAL_STR_MAX(uid_t
) + 1], line
[DECIMAL_STR_MAX(uid_t
)*3+3+1];
2834 xsprintf(uid_map
, "/proc/" PID_FMT
"/uid_map", pid
);
2835 xsprintf(line
, UID_FMT
" " UID_FMT
" " UID_FMT
"\n", 0, arg_uid_shift
, arg_uid_range
);
2836 r
= write_string_file(uid_map
, line
, 0);
2838 return log_error_errno(r
, "Failed to write UID map: %m");
2840 /* We always assign the same UID and GID ranges */
2841 xsprintf(uid_map
, "/proc/" PID_FMT
"/gid_map", pid
);
2842 r
= write_string_file(uid_map
, line
, 0);
2844 return log_error_errno(r
, "Failed to write GID map: %m");
2849 static int nspawn_dispatch_notify_fd(sd_event_source
*source
, int fd
, uint32_t revents
, void *userdata
) {
2850 char buf
[NOTIFY_BUFFER_MAX
+1];
2852 struct iovec iovec
= {
2854 .iov_len
= sizeof(buf
)-1,
2857 struct cmsghdr cmsghdr
;
2858 uint8_t buf
[CMSG_SPACE(sizeof(struct ucred
)) +
2859 CMSG_SPACE(sizeof(int) * NOTIFY_FD_MAX
)];
2861 struct msghdr msghdr
= {
2864 .msg_control
= &control
,
2865 .msg_controllen
= sizeof(control
),
2867 struct cmsghdr
*cmsg
;
2868 struct ucred
*ucred
= NULL
;
2870 pid_t inner_child_pid
;
2871 _cleanup_strv_free_
char **tags
= NULL
;
2875 inner_child_pid
= PTR_TO_PID(userdata
);
2877 if (revents
!= EPOLLIN
) {
2878 log_warning("Got unexpected poll event for notify fd.");
2882 n
= recvmsg(fd
, &msghdr
, MSG_DONTWAIT
|MSG_CMSG_CLOEXEC
);
2884 if (IN_SET(errno
, EAGAIN
, EINTR
))
2887 return log_warning_errno(errno
, "Couldn't read notification socket: %m");
2889 cmsg_close_all(&msghdr
);
2891 CMSG_FOREACH(cmsg
, &msghdr
) {
2892 if (cmsg
->cmsg_level
== SOL_SOCKET
&&
2893 cmsg
->cmsg_type
== SCM_CREDENTIALS
&&
2894 cmsg
->cmsg_len
== CMSG_LEN(sizeof(struct ucred
))) {
2896 ucred
= (struct ucred
*) CMSG_DATA(cmsg
);
2900 if (!ucred
|| ucred
->pid
!= inner_child_pid
) {
2901 log_debug("Received notify message without valid credentials. Ignoring.");
2905 if ((size_t) n
>= sizeof(buf
)) {
2906 log_warning("Received notify message exceeded maximum size. Ignoring.");
2911 tags
= strv_split(buf
, "\n\r");
2915 if (strv_find(tags
, "READY=1"))
2916 sd_notifyf(false, "READY=1\n");
2918 p
= strv_find_startswith(tags
, "STATUS=");
2920 sd_notifyf(false, "STATUS=Container running: %s", p
);
2925 static int setup_sd_notify_parent(sd_event
*event
, int fd
, pid_t
*inner_child_pid
, sd_event_source
**notify_event_source
) {
2928 r
= sd_event_add_io(event
, notify_event_source
, fd
, EPOLLIN
, nspawn_dispatch_notify_fd
, inner_child_pid
);
2930 return log_error_errno(r
, "Failed to allocate notify event source: %m");
2932 (void) sd_event_source_set_description(*notify_event_source
, "nspawn-notify");
2937 static int load_settings(void) {
2938 _cleanup_(settings_freep
) Settings
*settings
= NULL
;
2939 _cleanup_fclose_
FILE *f
= NULL
;
2940 _cleanup_free_
char *p
= NULL
;
2944 /* If all settings are masked, there's no point in looking for
2945 * the settings file */
2946 if ((arg_settings_mask
& _SETTINGS_MASK_ALL
) == _SETTINGS_MASK_ALL
)
2949 fn
= strjoina(arg_machine
, ".nspawn");
2951 /* We first look in the admin's directories in /etc and /run */
2952 FOREACH_STRING(i
, "/etc/systemd/nspawn", "/run/systemd/nspawn") {
2953 _cleanup_free_
char *j
= NULL
;
2955 j
= strjoin(i
, "/", fn
);
2964 /* By default, we trust configuration from /etc and /run */
2965 if (arg_settings_trusted
< 0)
2966 arg_settings_trusted
= true;
2971 if (errno
!= ENOENT
)
2972 return log_error_errno(errno
, "Failed to open %s: %m", j
);
2976 /* After that, let's look for a file next to the
2977 * actual image we shall boot. */
2980 p
= file_in_same_dir(arg_image
, fn
);
2983 } else if (arg_directory
) {
2984 p
= file_in_same_dir(arg_directory
, fn
);
2991 if (!f
&& errno
!= ENOENT
)
2992 return log_error_errno(errno
, "Failed to open %s: %m", p
);
2994 /* By default, we do not trust configuration from /var/lib/machines */
2995 if (arg_settings_trusted
< 0)
2996 arg_settings_trusted
= false;
3003 log_debug("Settings are trusted: %s", yes_no(arg_settings_trusted
));
3005 r
= settings_load(f
, p
, &settings
);
3009 /* Copy over bits from the settings, unless they have been
3010 * explicitly masked by command line switches. */
3012 if ((arg_settings_mask
& SETTING_START_MODE
) == 0 &&
3013 settings
->start_mode
>= 0) {
3014 arg_start_mode
= settings
->start_mode
;
3016 strv_free(arg_parameters
);
3017 arg_parameters
= settings
->parameters
;
3018 settings
->parameters
= NULL
;
3021 if ((arg_settings_mask
& SETTING_PIVOT_ROOT
) == 0 &&
3022 settings
->pivot_root_new
) {
3023 free_and_replace(arg_pivot_root_new
, settings
->pivot_root_new
);
3024 free_and_replace(arg_pivot_root_old
, settings
->pivot_root_old
);
3027 if ((arg_settings_mask
& SETTING_WORKING_DIRECTORY
) == 0 &&
3028 settings
->working_directory
) {
3030 arg_chdir
= settings
->working_directory
;
3031 settings
->working_directory
= NULL
;
3034 if ((arg_settings_mask
& SETTING_ENVIRONMENT
) == 0 &&
3035 settings
->environment
) {
3036 strv_free(arg_setenv
);
3037 arg_setenv
= settings
->environment
;
3038 settings
->environment
= NULL
;
3041 if ((arg_settings_mask
& SETTING_USER
) == 0 &&
3044 arg_user
= settings
->user
;
3045 settings
->user
= NULL
;
3048 if ((arg_settings_mask
& SETTING_CAPABILITY
) == 0) {
3051 plus
= settings
->capability
;
3052 if (settings_private_network(settings
))
3053 plus
|= (1ULL << CAP_NET_ADMIN
);
3055 if (!arg_settings_trusted
&& plus
!= 0) {
3056 if (settings
->capability
!= 0)
3057 log_warning("Ignoring Capability= setting, file %s is not trusted.", p
);
3059 arg_caps_retain
|= plus
;
3061 arg_caps_retain
&= ~settings
->drop_capability
;
3064 if ((arg_settings_mask
& SETTING_KILL_SIGNAL
) == 0 &&
3065 settings
->kill_signal
> 0)
3066 arg_kill_signal
= settings
->kill_signal
;
3068 if ((arg_settings_mask
& SETTING_PERSONALITY
) == 0 &&
3069 settings
->personality
!= PERSONALITY_INVALID
)
3070 arg_personality
= settings
->personality
;
3072 if ((arg_settings_mask
& SETTING_MACHINE_ID
) == 0 &&
3073 !sd_id128_is_null(settings
->machine_id
)) {
3075 if (!arg_settings_trusted
)
3076 log_warning("Ignoring MachineID= setting, file %s is not trusted.", p
);
3078 arg_uuid
= settings
->machine_id
;
3081 if ((arg_settings_mask
& SETTING_READ_ONLY
) == 0 &&
3082 settings
->read_only
>= 0)
3083 arg_read_only
= settings
->read_only
;
3085 if ((arg_settings_mask
& SETTING_VOLATILE_MODE
) == 0 &&
3086 settings
->volatile_mode
!= _VOLATILE_MODE_INVALID
)
3087 arg_volatile_mode
= settings
->volatile_mode
;
3089 if ((arg_settings_mask
& SETTING_CUSTOM_MOUNTS
) == 0 &&
3090 settings
->n_custom_mounts
> 0) {
3092 if (!arg_settings_trusted
)
3093 log_warning("Ignoring TemporaryFileSystem=, Bind= and BindReadOnly= settings, file %s is not trusted.", p
);
3095 custom_mount_free_all(arg_custom_mounts
, arg_n_custom_mounts
);
3096 arg_custom_mounts
= settings
->custom_mounts
;
3097 arg_n_custom_mounts
= settings
->n_custom_mounts
;
3099 settings
->custom_mounts
= NULL
;
3100 settings
->n_custom_mounts
= 0;
3104 if ((arg_settings_mask
& SETTING_NETWORK
) == 0 &&
3105 (settings
->private_network
>= 0 ||
3106 settings
->network_veth
>= 0 ||
3107 settings
->network_bridge
||
3108 settings
->network_zone
||
3109 settings
->network_interfaces
||
3110 settings
->network_macvlan
||
3111 settings
->network_ipvlan
||
3112 settings
->network_veth_extra
)) {
3114 if (!arg_settings_trusted
)
3115 log_warning("Ignoring network settings, file %s is not trusted.", p
);
3117 arg_network_veth
= settings_network_veth(settings
);
3118 arg_private_network
= settings_private_network(settings
);
3120 strv_free(arg_network_interfaces
);
3121 arg_network_interfaces
= settings
->network_interfaces
;
3122 settings
->network_interfaces
= NULL
;
3124 strv_free(arg_network_macvlan
);
3125 arg_network_macvlan
= settings
->network_macvlan
;
3126 settings
->network_macvlan
= NULL
;
3128 strv_free(arg_network_ipvlan
);
3129 arg_network_ipvlan
= settings
->network_ipvlan
;
3130 settings
->network_ipvlan
= NULL
;
3132 strv_free(arg_network_veth_extra
);
3133 arg_network_veth_extra
= settings
->network_veth_extra
;
3134 settings
->network_veth_extra
= NULL
;
3136 free(arg_network_bridge
);
3137 arg_network_bridge
= settings
->network_bridge
;
3138 settings
->network_bridge
= NULL
;
3140 free(arg_network_zone
);
3141 arg_network_zone
= settings
->network_zone
;
3142 settings
->network_zone
= NULL
;
3146 if ((arg_settings_mask
& SETTING_EXPOSE_PORTS
) == 0 &&
3147 settings
->expose_ports
) {
3149 if (!arg_settings_trusted
)
3150 log_warning("Ignoring Port= setting, file %s is not trusted.", p
);
3152 expose_port_free_all(arg_expose_ports
);
3153 arg_expose_ports
= settings
->expose_ports
;
3154 settings
->expose_ports
= NULL
;
3158 if ((arg_settings_mask
& SETTING_USERNS
) == 0 &&
3159 settings
->userns_mode
!= _USER_NAMESPACE_MODE_INVALID
) {
3161 if (!arg_settings_trusted
)
3162 log_warning("Ignoring PrivateUsers= and PrivateUsersChown= settings, file %s is not trusted.", p
);
3164 arg_userns_mode
= settings
->userns_mode
;
3165 arg_uid_shift
= settings
->uid_shift
;
3166 arg_uid_range
= settings
->uid_range
;
3167 arg_userns_chown
= settings
->userns_chown
;
3171 if ((arg_settings_mask
& SETTING_NOTIFY_READY
) == 0)
3172 arg_notify_ready
= settings
->notify_ready
;
3174 if ((arg_settings_mask
& SETTING_SYSCALL_FILTER
) == 0) {
3176 if (!arg_settings_trusted
&& !strv_isempty(arg_syscall_whitelist
))
3177 log_warning("Ignoring SystemCallFilter= settings, file %s is not trusted.", p
);
3179 strv_free(arg_syscall_whitelist
);
3180 strv_free(arg_syscall_blacklist
);
3182 arg_syscall_whitelist
= settings
->syscall_whitelist
;
3183 arg_syscall_blacklist
= settings
->syscall_blacklist
;
3185 settings
->syscall_whitelist
= settings
->syscall_blacklist
= NULL
;
3192 static int run(int master
,
3193 const char* console
,
3194 DissectedImage
*dissected_image
,
3198 char veth_name
[IFNAMSIZ
], bool *veth_created
,
3199 union in_addr_union
*exposed
,
3200 pid_t
*pid
, int *ret
) {
3202 static const struct sigaction sa
= {
3203 .sa_handler
= nop_signal_handler
,
3204 .sa_flags
= SA_NOCLDSTOP
|SA_RESTART
,
3207 _cleanup_release_lock_file_ LockFile uid_shift_lock
= LOCK_FILE_INIT
;
3208 _cleanup_close_
int etc_passwd_lock
= -1;
3209 _cleanup_close_pair_
int
3210 kmsg_socket_pair
[2] = { -1, -1 },
3211 rtnl_socket_pair
[2] = { -1, -1 },
3212 pid_socket_pair
[2] = { -1, -1 },
3213 uuid_socket_pair
[2] = { -1, -1 },
3214 notify_socket_pair
[2] = { -1, -1 },
3215 uid_shift_socket_pair
[2] = { -1, -1 };
3216 _cleanup_close_
int notify_socket
= -1;
3217 _cleanup_(barrier_destroy
) Barrier barrier
= BARRIER_NULL
;
3218 _cleanup_(sd_event_source_unrefp
) sd_event_source
*notify_event_source
= NULL
;
3219 _cleanup_(sd_event_unrefp
) sd_event
*event
= NULL
;
3220 _cleanup_(pty_forward_freep
) PTYForward
*forward
= NULL
;
3221 _cleanup_(sd_netlink_unrefp
) sd_netlink
*rtnl
= NULL
;
3222 ContainerStatus container_status
= 0;
3228 assert_se(sigemptyset(&mask_chld
) == 0);
3229 assert_se(sigaddset(&mask_chld
, SIGCHLD
) == 0);
3231 if (arg_userns_mode
== USER_NAMESPACE_PICK
) {
3232 /* When we shall pick the UID/GID range, let's first lock /etc/passwd, so that we can safely
3233 * check with getpwuid() if the specific user already exists. Note that /etc might be
3234 * read-only, in which case this will fail with EROFS. But that's really OK, as in that case we
3235 * can be reasonably sure that no users are going to be added. Note that getpwuid() checks are
3236 * really just an extra safety net. We kinda assume that the UID range we allocate from is
3239 etc_passwd_lock
= take_etc_passwd_lock(NULL
);
3240 if (etc_passwd_lock
< 0 && etc_passwd_lock
!= -EROFS
)
3241 return log_error_errno(etc_passwd_lock
, "Failed to take /etc/passwd lock: %m");
3244 r
= barrier_create(&barrier
);
3246 return log_error_errno(r
, "Cannot initialize IPC barrier: %m");
3248 if (socketpair(AF_UNIX
, SOCK_SEQPACKET
|SOCK_CLOEXEC
, 0, kmsg_socket_pair
) < 0)
3249 return log_error_errno(errno
, "Failed to create kmsg socket pair: %m");
3251 if (socketpair(AF_UNIX
, SOCK_SEQPACKET
|SOCK_CLOEXEC
, 0, rtnl_socket_pair
) < 0)
3252 return log_error_errno(errno
, "Failed to create rtnl socket pair: %m");
3254 if (socketpair(AF_UNIX
, SOCK_SEQPACKET
|SOCK_CLOEXEC
, 0, pid_socket_pair
) < 0)
3255 return log_error_errno(errno
, "Failed to create pid socket pair: %m");
3257 if (socketpair(AF_UNIX
, SOCK_SEQPACKET
|SOCK_CLOEXEC
, 0, uuid_socket_pair
) < 0)
3258 return log_error_errno(errno
, "Failed to create id socket pair: %m");
3260 if (socketpair(AF_UNIX
, SOCK_SEQPACKET
|SOCK_CLOEXEC
, 0, notify_socket_pair
) < 0)
3261 return log_error_errno(errno
, "Failed to create notify socket pair: %m");
3263 if (arg_userns_mode
!= USER_NAMESPACE_NO
)
3264 if (socketpair(AF_UNIX
, SOCK_SEQPACKET
|SOCK_CLOEXEC
, 0, uid_shift_socket_pair
) < 0)
3265 return log_error_errno(errno
, "Failed to create uid shift socket pair: %m");
3267 /* Child can be killed before execv(), so handle SIGCHLD in order to interrupt
3268 * parent's blocking calls and give it a chance to call wait() and terminate. */
3269 r
= sigprocmask(SIG_UNBLOCK
, &mask_chld
, NULL
);
3271 return log_error_errno(errno
, "Failed to change the signal mask: %m");
3273 r
= sigaction(SIGCHLD
, &sa
, NULL
);
3275 return log_error_errno(errno
, "Failed to install SIGCHLD handler: %m");
3277 *pid
= raw_clone(SIGCHLD
|CLONE_NEWNS
);
3279 return log_error_errno(errno
, "clone() failed%s: %m",
3281 ", do you have namespace support enabled in your kernel? (You need UTS, IPC, PID and NET namespacing built in)" : "");
3284 /* The outer child only has a file system namespace. */
3285 barrier_set_role(&barrier
, BARRIER_CHILD
);
3287 master
= safe_close(master
);
3289 kmsg_socket_pair
[0] = safe_close(kmsg_socket_pair
[0]);
3290 rtnl_socket_pair
[0] = safe_close(rtnl_socket_pair
[0]);
3291 pid_socket_pair
[0] = safe_close(pid_socket_pair
[0]);
3292 uuid_socket_pair
[0] = safe_close(uuid_socket_pair
[0]);
3293 notify_socket_pair
[0] = safe_close(notify_socket_pair
[0]);
3294 uid_shift_socket_pair
[0] = safe_close(uid_shift_socket_pair
[0]);
3296 (void) reset_all_signal_handlers();
3297 (void) reset_signal_mask();
3299 r
= outer_child(&barrier
,
3306 uuid_socket_pair
[1],
3307 notify_socket_pair
[1],
3308 kmsg_socket_pair
[1],
3309 rtnl_socket_pair
[1],
3310 uid_shift_socket_pair
[1],
3313 _exit(EXIT_FAILURE
);
3315 _exit(EXIT_SUCCESS
);
3318 barrier_set_role(&barrier
, BARRIER_PARENT
);
3320 fds
= fdset_free(fds
);
3322 kmsg_socket_pair
[1] = safe_close(kmsg_socket_pair
[1]);
3323 rtnl_socket_pair
[1] = safe_close(rtnl_socket_pair
[1]);
3324 pid_socket_pair
[1] = safe_close(pid_socket_pair
[1]);
3325 uuid_socket_pair
[1] = safe_close(uuid_socket_pair
[1]);
3326 notify_socket_pair
[1] = safe_close(notify_socket_pair
[1]);
3327 uid_shift_socket_pair
[1] = safe_close(uid_shift_socket_pair
[1]);
3329 if (arg_userns_mode
!= USER_NAMESPACE_NO
) {
3330 /* The child just let us know the UID shift it might have read from the image. */
3331 l
= recv(uid_shift_socket_pair
[0], &arg_uid_shift
, sizeof arg_uid_shift
, 0);
3333 return log_error_errno(errno
, "Failed to read UID shift: %m");
3334 if (l
!= sizeof arg_uid_shift
) {
3335 log_error("Short read while reading UID shift.");
3339 if (arg_userns_mode
== USER_NAMESPACE_PICK
) {
3340 /* If we are supposed to pick the UID shift, let's try to use the shift read from the
3341 * image, but if that's already in use, pick a new one, and report back to the child,
3342 * which one we now picked. */
3344 r
= uid_shift_pick(&arg_uid_shift
, &uid_shift_lock
);
3346 return log_error_errno(r
, "Failed to pick suitable UID/GID range: %m");
3348 l
= send(uid_shift_socket_pair
[0], &arg_uid_shift
, sizeof arg_uid_shift
, MSG_NOSIGNAL
);
3350 return log_error_errno(errno
, "Failed to send UID shift: %m");
3351 if (l
!= sizeof arg_uid_shift
) {
3352 log_error("Short write while writing UID shift.");
3358 /* Wait for the outer child. */
3359 r
= wait_for_terminate_and_warn("namespace helper", *pid
, NULL
);
3361 return r
< 0 ? r
: -EIO
;
3363 /* And now retrieve the PID of the inner child. */
3364 l
= recv(pid_socket_pair
[0], pid
, sizeof *pid
, 0);
3366 return log_error_errno(errno
, "Failed to read inner child PID: %m");
3367 if (l
!= sizeof *pid
) {
3368 log_error("Short read while reading inner child PID.");
3372 /* We also retrieve container UUID in case it was generated by outer child */
3373 l
= recv(uuid_socket_pair
[0], &arg_uuid
, sizeof arg_uuid
, 0);
3375 return log_error_errno(errno
, "Failed to read container machine ID: %m");
3376 if (l
!= sizeof(arg_uuid
)) {
3377 log_error("Short read while reading container machined ID.");
3381 /* We also retrieve the socket used for notifications generated by outer child */
3382 notify_socket
= receive_one_fd(notify_socket_pair
[0], 0);
3383 if (notify_socket
< 0)
3384 return log_error_errno(notify_socket
,
3385 "Failed to receive notification socket from the outer child: %m");
3387 log_debug("Init process invoked as PID "PID_FMT
, *pid
);
3389 if (arg_userns_mode
!= USER_NAMESPACE_NO
) {
3390 if (!barrier_place_and_sync(&barrier
)) { /* #1 */
3391 log_error("Child died too early.");
3395 r
= setup_uid_map(*pid
);
3399 (void) barrier_place(&barrier
); /* #2 */
3402 if (arg_private_network
) {
3404 r
= move_network_interfaces(*pid
, arg_network_interfaces
);
3408 if (arg_network_veth
) {
3409 r
= setup_veth(arg_machine
, *pid
, veth_name
,
3410 arg_network_bridge
|| arg_network_zone
);
3416 if (arg_network_bridge
) {
3417 /* Add the interface to a bridge */
3418 r
= setup_bridge(veth_name
, arg_network_bridge
, false);
3423 } else if (arg_network_zone
) {
3424 /* Add the interface to a bridge, possibly creating it */
3425 r
= setup_bridge(veth_name
, arg_network_zone
, true);
3433 r
= setup_veth_extra(arg_machine
, *pid
, arg_network_veth_extra
);
3437 /* We created the primary and extra veth links now; let's remember this, so that we know to
3438 remove them later on. Note that we don't bother with removing veth links that were created
3439 here when their setup failed half-way, because in that case the kernel should be able to
3440 remove them on its own, since they cannot be referenced by anything yet. */
3441 *veth_created
= true;
3443 r
= setup_macvlan(arg_machine
, *pid
, arg_network_macvlan
);
3447 r
= setup_ipvlan(arg_machine
, *pid
, arg_network_ipvlan
);
3453 r
= register_machine(
3460 arg_custom_mounts
, arg_n_custom_mounts
,
3464 arg_container_service_name
);
3467 } else if (!arg_keep_unit
) {
3472 arg_custom_mounts
, arg_n_custom_mounts
,
3478 } else if (arg_slice
|| arg_property
)
3479 log_notice("Machine and scope registration turned off, --slice= and --property= settings will have no effect.");
3481 r
= sync_cgroup(*pid
, arg_unified_cgroup_hierarchy
, arg_uid_shift
);
3485 if (arg_keep_unit
) {
3486 r
= create_subcgroup(*pid
, arg_unified_cgroup_hierarchy
);
3491 r
= chown_cgroup(*pid
, arg_uid_shift
);
3495 /* Notify the child that the parent is ready with all
3496 * its setup (including cgroup-ification), and that
3497 * the child can now hand over control to the code to
3498 * run inside the container. */
3499 (void) barrier_place(&barrier
); /* #3 */
3501 /* Block SIGCHLD here, before notifying child.
3502 * process_pty() will handle it with the other signals. */
3503 assert_se(sigprocmask(SIG_BLOCK
, &mask_chld
, NULL
) >= 0);
3505 /* Reset signal to default */
3506 r
= default_signals(SIGCHLD
, -1);
3508 return log_error_errno(r
, "Failed to reset SIGCHLD: %m");
3510 r
= sd_event_new(&event
);
3512 return log_error_errno(r
, "Failed to get default event source: %m");
3514 r
= setup_sd_notify_parent(event
, notify_socket
, PID_TO_PTR(*pid
), ¬ify_event_source
);
3518 /* Let the child know that we are ready and wait that the child is completely ready now. */
3519 if (!barrier_place_and_sync(&barrier
)) { /* #4 */
3520 log_error("Child died too early.");
3524 /* At this point we have made use of the UID we picked, and thus nss-mymachines
3525 * will make them appear in getpwuid(), thus we can release the /etc/passwd lock. */
3526 etc_passwd_lock
= safe_close(etc_passwd_lock
);
3529 "STATUS=Container running.\n"
3530 "X_NSPAWN_LEADER_PID=" PID_FMT
, *pid
);
3531 if (!arg_notify_ready
)
3532 sd_notify(false, "READY=1\n");
3534 if (arg_kill_signal
> 0) {
3535 /* Try to kill the init system on SIGINT or SIGTERM */
3536 sd_event_add_signal(event
, NULL
, SIGINT
, on_orderly_shutdown
, PID_TO_PTR(*pid
));
3537 sd_event_add_signal(event
, NULL
, SIGTERM
, on_orderly_shutdown
, PID_TO_PTR(*pid
));
3539 /* Immediately exit */
3540 sd_event_add_signal(event
, NULL
, SIGINT
, NULL
, NULL
);
3541 sd_event_add_signal(event
, NULL
, SIGTERM
, NULL
, NULL
);
3544 /* Exit when the child exits */
3545 sd_event_add_signal(event
, NULL
, SIGCHLD
, on_sigchld
, PID_TO_PTR(*pid
));
3547 if (arg_expose_ports
) {
3548 r
= expose_port_watch_rtnl(event
, rtnl_socket_pair
[0], on_address_change
, exposed
, &rtnl
);
3552 (void) expose_port_execute(rtnl
, arg_expose_ports
, exposed
);
3555 rtnl_socket_pair
[0] = safe_close(rtnl_socket_pair
[0]);
3557 r
= pty_forward_new(event
, master
,
3558 PTY_FORWARD_IGNORE_VHANGUP
| (interactive
? 0 : PTY_FORWARD_READ_ONLY
),
3561 return log_error_errno(r
, "Failed to create PTY forwarder: %m");
3563 r
= sd_event_loop(event
);
3565 return log_error_errno(r
, "Failed to run event loop: %m");
3567 pty_forward_get_last_char(forward
, &last_char
);
3569 forward
= pty_forward_free(forward
);
3571 if (!arg_quiet
&& last_char
!= '\n')
3574 /* Kill if it is not dead yet anyway */
3575 if (arg_register
&& !arg_keep_unit
)
3576 terminate_machine(*pid
);
3578 /* Normally redundant, but better safe than sorry */
3579 (void) kill(*pid
, SIGKILL
);
3581 r
= wait_for_container(*pid
, &container_status
);
3585 /* We failed to wait for the container, or the container exited abnormally. */
3587 if (r
> 0 || container_status
== CONTAINER_TERMINATED
) {
3588 /* r > 0 → The container exited with a non-zero status.
3589 * As a special case, we need to replace 133 with a different value,
3590 * because 133 is special-cased in the service file to reboot the container.
3591 * otherwise → The container exited with zero status and a reboot was not requested.
3593 if (r
== EXIT_FORCE_RESTART
)
3594 r
= EXIT_FAILURE
; /* replace 133 with the general failure code */
3596 return 0; /* finito */
3599 /* CONTAINER_REBOOTED, loop again */
3601 if (arg_keep_unit
) {
3602 /* Special handling if we are running as a service: instead of simply
3603 * restarting the machine we want to restart the entire service, so let's
3604 * inform systemd about this with the special exit code 133. The service
3605 * file uses RestartForceExitStatus=133 so that this results in a full
3606 * nspawn restart. This is necessary since we might have cgroup parameters
3607 * set we want to have flushed out. */
3608 *ret
= EXIT_FORCE_RESTART
;
3609 return 0; /* finito */
3612 expose_port_flush(arg_expose_ports
, exposed
);
3614 (void) remove_veth_links(veth_name
, arg_network_veth_extra
);
3615 *veth_created
= false;
3616 return 1; /* loop again */
3619 int main(int argc
, char *argv
[]) {
3621 _cleanup_free_
char *console
= NULL
;
3622 _cleanup_close_
int master
= -1;
3623 _cleanup_fdset_free_ FDSet
*fds
= NULL
;
3624 int r
, n_fd_passed
, ret
= EXIT_SUCCESS
;
3625 char veth_name
[IFNAMSIZ
] = "";
3626 bool secondary
= false, remove_directory
= false, remove_image
= false;
3628 union in_addr_union exposed
= {};
3629 _cleanup_release_lock_file_ LockFile tree_global_lock
= LOCK_FILE_INIT
, tree_local_lock
= LOCK_FILE_INIT
;
3630 bool interactive
, veth_created
= false, remove_tmprootdir
= false;
3631 char tmprootdir
[] = "/tmp/nspawn-root-XXXXXX";
3632 _cleanup_(loop_device_unrefp
) LoopDevice
*loop
= NULL
;
3633 _cleanup_(decrypted_image_unrefp
) DecryptedImage
*decrypted_image
= NULL
;
3634 _cleanup_(dissected_image_unrefp
) DissectedImage
*dissected_image
= NULL
;
3636 log_parse_environment();
3639 /* Make sure rename_process() in the stub init process can work */
3643 r
= parse_argv(argc
, argv
);
3647 if (geteuid() != 0) {
3648 log_error("Need to be root.");
3652 r
= determine_names();
3656 r
= load_settings();
3660 r
= verify_arguments();
3664 n_fd_passed
= sd_listen_fds(false);
3665 if (n_fd_passed
> 0) {
3666 r
= fdset_new_listen_fds(&fds
, false);
3668 log_error_errno(r
, "Failed to collect file descriptors: %m");
3673 if (arg_directory
) {
3676 if (path_equal(arg_directory
, "/") && !arg_ephemeral
) {
3677 log_error("Spawning container on root directory is not supported. Consider using --ephemeral.");
3682 if (arg_ephemeral
) {
3683 _cleanup_free_
char *np
= NULL
;
3685 r
= chase_symlinks_and_update(&arg_directory
, 0);
3689 /* If the specified path is a mount point we
3690 * generate the new snapshot immediately
3691 * inside it under a random name. However if
3692 * the specified is not a mount point we
3693 * create the new snapshot in the parent
3694 * directory, just next to it. */
3695 r
= path_is_mount_point(arg_directory
, NULL
, 0);
3697 log_error_errno(r
, "Failed to determine whether directory %s is mount point: %m", arg_directory
);
3701 r
= tempfn_random_child(arg_directory
, "machine.", &np
);
3703 r
= tempfn_random(arg_directory
, "machine.", &np
);
3705 log_error_errno(r
, "Failed to generate name for directory snapshot: %m");
3709 r
= image_path_lock(np
, (arg_read_only
? LOCK_SH
: LOCK_EX
) | LOCK_NB
, &tree_global_lock
, &tree_local_lock
);
3711 log_error_errno(r
, "Failed to lock %s: %m", np
);
3715 r
= btrfs_subvol_snapshot(arg_directory
, np
,
3716 (arg_read_only
? BTRFS_SNAPSHOT_READ_ONLY
: 0) |
3717 BTRFS_SNAPSHOT_FALLBACK_COPY
|
3718 BTRFS_SNAPSHOT_FALLBACK_DIRECTORY
|
3719 BTRFS_SNAPSHOT_RECURSIVE
|
3720 BTRFS_SNAPSHOT_QUOTA
);
3722 log_error_errno(r
, "Failed to create snapshot %s from %s: %m", np
, arg_directory
);
3726 free(arg_directory
);
3730 remove_directory
= true;
3733 r
= chase_symlinks_and_update(&arg_directory
, arg_template
? CHASE_NONEXISTENT
: 0);
3737 r
= image_path_lock(arg_directory
, (arg_read_only
? LOCK_SH
: LOCK_EX
) | LOCK_NB
, &tree_global_lock
, &tree_local_lock
);
3739 log_error_errno(r
, "Directory tree %s is currently busy.", arg_directory
);
3743 log_error_errno(r
, "Failed to lock %s: %m", arg_directory
);
3748 r
= chase_symlinks_and_update(&arg_template
, 0);
3752 r
= btrfs_subvol_snapshot(arg_template
, arg_directory
,
3753 (arg_read_only
? BTRFS_SNAPSHOT_READ_ONLY
: 0) |
3754 BTRFS_SNAPSHOT_FALLBACK_COPY
|
3755 BTRFS_SNAPSHOT_FALLBACK_DIRECTORY
|
3756 BTRFS_SNAPSHOT_FALLBACK_IMMUTABLE
|
3757 BTRFS_SNAPSHOT_RECURSIVE
|
3758 BTRFS_SNAPSHOT_QUOTA
);
3761 log_info("Directory %s already exists, not populating from template %s.", arg_directory
, arg_template
);
3763 log_error_errno(r
, "Couldn't create snapshot %s from %s: %m", arg_directory
, arg_template
);
3767 log_info("Populated %s from template %s.", arg_directory
, arg_template
);
3772 if (arg_start_mode
== START_BOOT
) {
3773 if (path_is_os_tree(arg_directory
) <= 0) {
3774 log_error("Directory %s doesn't look like an OS root directory (os-release file is missing). Refusing.", arg_directory
);
3781 p
= strjoina(arg_directory
, "/usr/");
3782 if (laccess(p
, F_OK
) < 0) {
3783 log_error("Directory %s doesn't look like it has an OS tree. Refusing.", arg_directory
);
3791 assert(!arg_template
);
3793 r
= chase_symlinks_and_update(&arg_image
, 0);
3797 if (arg_ephemeral
) {
3798 _cleanup_free_
char *np
= NULL
;
3800 r
= tempfn_random(arg_image
, "machine.", &np
);
3802 log_error_errno(r
, "Failed to generate name for image snapshot: %m");
3806 r
= image_path_lock(np
, (arg_read_only
? LOCK_SH
: LOCK_EX
) | LOCK_NB
, &tree_global_lock
, &tree_local_lock
);
3808 r
= log_error_errno(r
, "Failed to create image lock: %m");
3812 r
= copy_file(arg_image
, np
, O_EXCL
, arg_read_only
? 0400 : 0600, FS_NOCOW_FL
, COPY_REFLINK
);
3814 r
= log_error_errno(r
, "Failed to copy image file: %m");
3822 remove_image
= true;
3824 r
= image_path_lock(arg_image
, (arg_read_only
? LOCK_SH
: LOCK_EX
) | LOCK_NB
, &tree_global_lock
, &tree_local_lock
);
3826 r
= log_error_errno(r
, "Disk image %s is currently busy.", arg_image
);
3830 r
= log_error_errno(r
, "Failed to create image lock: %m");
3834 if (!arg_root_hash
) {
3835 r
= root_hash_load(arg_image
, &arg_root_hash
, &arg_root_hash_size
);
3837 log_error_errno(r
, "Failed to load root hash file for %s: %m", arg_image
);
3843 if (!mkdtemp(tmprootdir
)) {
3844 r
= log_error_errno(errno
, "Failed to create temporary directory: %m");
3848 remove_tmprootdir
= true;
3850 arg_directory
= strdup(tmprootdir
);
3851 if (!arg_directory
) {
3856 r
= loop_device_make_by_path(arg_image
, arg_read_only
? O_RDONLY
: O_RDWR
, &loop
);
3858 log_error_errno(r
, "Failed to set up loopback block device: %m");
3864 arg_root_hash
, arg_root_hash_size
,
3865 DISSECT_IMAGE_REQUIRE_ROOT
,
3868 log_error_errno(r
, "Could not find a suitable file system or partition table in image: %s", arg_image
);
3870 log_notice("Note that the disk image needs to\n"
3871 " a) either contain only a single MBR partition of type 0x83 that is marked bootable\n"
3872 " b) or contain a single GPT partition of type 0FC63DAF-8483-4772-8E79-3D69D8477DE4\n"
3873 " c) or follow http://www.freedesktop.org/wiki/Specifications/DiscoverablePartitionsSpec/\n"
3874 " d) or contain a file system without a partition table\n"
3875 "in order to be bootable with systemd-nspawn.");
3878 if (r
== -EADDRNOTAVAIL
) {
3879 log_error_errno(r
, "No root partition for specified root hash found.");
3882 if (r
== -EOPNOTSUPP
) {
3883 log_error_errno(r
, "--image= is not supported, compiled without blkid support.");
3886 if (r
== -EPROTONOSUPPORT
) {
3887 log_error_errno(r
, "Device is loopback block device with partition scanning turned off, please turn it on.");
3891 log_error_errno(r
, "Failed to dissect image: %m");
3895 if (!arg_root_hash
&& dissected_image
->can_verity
)
3896 log_notice("Note: image %s contains verity information, but no root hash specified! Proceeding without integrity checking.", arg_image
);
3898 r
= dissected_image_decrypt_interactively(dissected_image
, NULL
, arg_root_hash
, arg_root_hash_size
, 0, &decrypted_image
);
3902 /* Now that we mounted the image, let's try to remove it again, if it is ephemeral */
3903 if (remove_image
&& unlink(arg_image
) >= 0)
3904 remove_image
= false;
3907 r
= custom_mount_prepare_all(arg_directory
, arg_custom_mounts
, arg_n_custom_mounts
);
3911 r
= detect_unified_cgroup_hierarchy(arg_directory
);
3916 isatty(STDIN_FILENO
) > 0 &&
3917 isatty(STDOUT_FILENO
) > 0;
3919 master
= posix_openpt(O_RDWR
|O_NOCTTY
|O_CLOEXEC
|O_NDELAY
);
3921 r
= log_error_errno(errno
, "Failed to acquire pseudo tty: %m");
3925 r
= ptsname_malloc(master
, &console
);
3927 r
= log_error_errno(r
, "Failed to determine tty name: %m");
3931 if (arg_selinux_apifs_context
) {
3932 r
= mac_selinux_apply(console
, arg_selinux_apifs_context
);
3937 if (unlockpt(master
) < 0) {
3938 r
= log_error_errno(errno
, "Failed to unlock tty: %m");
3943 log_info("Spawning container %s on %s.\nPress ^] three times within 1s to kill container.",
3944 arg_machine
, arg_image
?: arg_directory
);
3946 assert_se(sigprocmask_many(SIG_BLOCK
, NULL
, SIGCHLD
, SIGWINCH
, SIGTERM
, SIGINT
, -1) >= 0);
3948 if (prctl(PR_SET_CHILD_SUBREAPER
, 1) < 0) {
3949 r
= log_error_errno(errno
, "Failed to become subreaper: %m");
3957 interactive
, secondary
,
3959 veth_name
, &veth_created
,
3968 r
== 0 && ret
== EXIT_FORCE_RESTART
? "STOPPING=1\nSTATUS=Restarting..." :
3969 "STOPPING=1\nSTATUS=Terminating...");
3972 (void) kill(pid
, SIGKILL
);
3974 /* Try to flush whatever is still queued in the pty */
3976 (void) copy_bytes(master
, STDOUT_FILENO
, (uint64_t) -1, 0);
3977 master
= safe_close(master
);
3981 (void) wait_for_terminate(pid
, NULL
);
3983 if (remove_directory
&& arg_directory
) {
3986 k
= rm_rf(arg_directory
, REMOVE_ROOT
|REMOVE_PHYSICAL
|REMOVE_SUBVOLUME
);
3988 log_warning_errno(k
, "Cannot remove '%s', ignoring: %m", arg_directory
);
3991 if (remove_image
&& arg_image
) {
3992 if (unlink(arg_image
) < 0)
3993 log_warning_errno(errno
, "Can't remove image file '%s', ignoring: %m", arg_image
);
3996 if (remove_tmprootdir
) {
3997 if (rmdir(tmprootdir
) < 0)
3998 log_debug_errno(errno
, "Can't remove temporary root directory '%s', ignoring: %m", tmprootdir
);
4004 p
= strjoina("/run/systemd/nspawn/propagate/", arg_machine
);
4005 (void) rm_rf(p
, REMOVE_ROOT
);
4008 expose_port_flush(arg_expose_ports
, &exposed
);
4011 (void) remove_veth_links(veth_name
, arg_network_veth_extra
);
4012 (void) remove_bridge(arg_network_zone
);
4014 free(arg_directory
);
4019 free(arg_pivot_root_new
);
4020 free(arg_pivot_root_old
);
4022 strv_free(arg_setenv
);
4023 free(arg_network_bridge
);
4024 strv_free(arg_network_interfaces
);
4025 strv_free(arg_network_macvlan
);
4026 strv_free(arg_network_ipvlan
);
4027 strv_free(arg_network_veth_extra
);
4028 strv_free(arg_parameters
);
4029 custom_mount_free_all(arg_custom_mounts
, arg_n_custom_mounts
);
4030 expose_port_free_all(arg_expose_ports
);
4031 free(arg_root_hash
);
4033 return r
< 0 ? EXIT_FAILURE
: ret
;