1 /* SPDX-License-Identifier: LGPL-2.1+ */
10 #include <linux/loop.h>
14 #include <selinux/selinux.h>
21 #include <sys/personality.h>
22 #include <sys/prctl.h>
23 #include <sys/types.h>
28 #include "sd-daemon.h"
31 #include "alloc-util.h"
33 #include "base-filesystem.h"
34 #include "blkid-util.h"
35 #include "btrfs-util.h"
36 #include "bus-error.h"
39 #include "capability-util.h"
40 #include "cgroup-util.h"
42 #include "cpu-set-util.h"
43 #include "dev-setup.h"
44 #include "dissect-image.h"
49 #include "format-util.h"
52 #include "hexdecoct.h"
53 #include "hostname-util.h"
54 #include "id128-util.h"
56 #include "loop-util.h"
57 #include "loopback-setup.h"
58 #include "machine-image.h"
60 #include "main-func.h"
63 #include "mount-util.h"
64 #include "mountpoint-util.h"
65 #include "namespace-util.h"
66 #include "netlink-util.h"
67 #include "nspawn-cgroup.h"
68 #include "nspawn-def.h"
69 #include "nspawn-expose-ports.h"
70 #include "nspawn-mount.h"
71 #include "nspawn-network.h"
72 #include "nspawn-oci.h"
73 #include "nspawn-patch-uid.h"
74 #include "nspawn-register.h"
75 #include "nspawn-seccomp.h"
76 #include "nspawn-settings.h"
77 #include "nspawn-setuid.h"
78 #include "nspawn-stub-pid1.h"
79 #include "nulstr-util.h"
82 #include "parse-util.h"
83 #include "path-util.h"
84 #include "pretty-print.h"
85 #include "process-util.h"
87 #include "random-util.h"
88 #include "raw-clone.h"
89 #include "rlimit-util.h"
92 #include "seccomp-util.h"
94 #include "selinux-util.h"
95 #include "signal-util.h"
96 #include "socket-util.h"
97 #include "stat-util.h"
98 #include "stdio-util.h"
99 #include "string-table.h"
100 #include "string-util.h"
102 #include "sysctl-util.h"
103 #include "terminal-util.h"
104 #include "tmpfile-util.h"
105 #include "umask-util.h"
106 #include "user-util.h"
110 #define STATIC_RESOLV_CONF "/lib/systemd/resolv.conf"
112 #define STATIC_RESOLV_CONF "/usr/lib/systemd/resolv.conf"
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 static char *arg_directory
= NULL
;
128 static char *arg_template
= NULL
;
129 static char *arg_chdir
= NULL
;
130 static char *arg_pivot_root_new
= NULL
;
131 static char *arg_pivot_root_old
= NULL
;
132 static char *arg_user
= NULL
;
133 static uid_t arg_uid
= UID_INVALID
;
134 static gid_t arg_gid
= GID_INVALID
;
135 static gid_t
* arg_supplementary_gids
= NULL
;
136 static size_t arg_n_supplementary_gids
= 0;
137 static sd_id128_t arg_uuid
= {};
138 static char *arg_machine
= NULL
; /* The name used by the host to refer to this */
139 static char *arg_hostname
= NULL
; /* The name the payload sees by default */
140 static const char *arg_selinux_context
= NULL
;
141 static const char *arg_selinux_apifs_context
= NULL
;
142 static char *arg_slice
= NULL
;
143 static bool arg_private_network
= false;
144 static bool arg_read_only
= false;
145 static StartMode arg_start_mode
= START_PID1
;
146 static bool arg_ephemeral
= false;
147 static LinkJournal arg_link_journal
= LINK_AUTO
;
148 static bool arg_link_journal_try
= false;
149 static uint64_t arg_caps_retain
=
150 (1ULL << CAP_AUDIT_CONTROL
) |
151 (1ULL << CAP_AUDIT_WRITE
) |
152 (1ULL << CAP_CHOWN
) |
153 (1ULL << CAP_DAC_OVERRIDE
) |
154 (1ULL << CAP_DAC_READ_SEARCH
) |
155 (1ULL << CAP_FOWNER
) |
156 (1ULL << CAP_FSETID
) |
157 (1ULL << CAP_IPC_OWNER
) |
159 (1ULL << CAP_LEASE
) |
160 (1ULL << CAP_LINUX_IMMUTABLE
) |
161 (1ULL << CAP_MKNOD
) |
162 (1ULL << CAP_NET_BIND_SERVICE
) |
163 (1ULL << CAP_NET_BROADCAST
) |
164 (1ULL << CAP_NET_RAW
) |
165 (1ULL << CAP_SETFCAP
) |
166 (1ULL << CAP_SETGID
) |
167 (1ULL << CAP_SETPCAP
) |
168 (1ULL << CAP_SETUID
) |
169 (1ULL << CAP_SYS_ADMIN
) |
170 (1ULL << CAP_SYS_BOOT
) |
171 (1ULL << CAP_SYS_CHROOT
) |
172 (1ULL << CAP_SYS_NICE
) |
173 (1ULL << CAP_SYS_PTRACE
) |
174 (1ULL << CAP_SYS_RESOURCE
) |
175 (1ULL << CAP_SYS_TTY_CONFIG
);
176 static CapabilityQuintet arg_full_capabilities
= CAPABILITY_QUINTET_NULL
;
177 static CustomMount
*arg_custom_mounts
= NULL
;
178 static size_t arg_n_custom_mounts
= 0;
179 static char **arg_setenv
= NULL
;
180 static bool arg_quiet
= false;
181 static bool arg_register
= true;
182 static bool arg_keep_unit
= false;
183 static char **arg_network_interfaces
= NULL
;
184 static char **arg_network_macvlan
= NULL
;
185 static char **arg_network_ipvlan
= NULL
;
186 static bool arg_network_veth
= false;
187 static char **arg_network_veth_extra
= NULL
;
188 static char *arg_network_bridge
= NULL
;
189 static char *arg_network_zone
= NULL
;
190 static char *arg_network_namespace_path
= NULL
;
191 static PagerFlags arg_pager_flags
= 0;
192 static unsigned long arg_personality
= PERSONALITY_INVALID
;
193 static char *arg_image
= NULL
;
194 static char *arg_oci_bundle
= NULL
;
195 static VolatileMode arg_volatile_mode
= VOLATILE_NO
;
196 static ExposePort
*arg_expose_ports
= NULL
;
197 static char **arg_property
= NULL
;
198 static sd_bus_message
*arg_property_message
= NULL
;
199 static UserNamespaceMode arg_userns_mode
= USER_NAMESPACE_NO
;
200 static uid_t arg_uid_shift
= UID_INVALID
, arg_uid_range
= 0x10000U
;
201 static bool arg_userns_chown
= false;
202 static int arg_kill_signal
= 0;
203 static CGroupUnified arg_unified_cgroup_hierarchy
= CGROUP_UNIFIED_UNKNOWN
;
204 static SettingsMask arg_settings_mask
= 0;
205 static int arg_settings_trusted
= -1;
206 static char **arg_parameters
= NULL
;
207 static const char *arg_container_service_name
= "systemd-nspawn";
208 static bool arg_notify_ready
= false;
209 static bool arg_use_cgns
= true;
210 static unsigned long arg_clone_ns_flags
= CLONE_NEWIPC
|CLONE_NEWPID
|CLONE_NEWUTS
;
211 static MountSettingsMask arg_mount_settings
= MOUNT_APPLY_APIVFS_RO
|MOUNT_APPLY_TMPFS_TMP
;
212 static void *arg_root_hash
= NULL
;
213 static size_t arg_root_hash_size
= 0;
214 static char **arg_syscall_whitelist
= NULL
;
215 static char **arg_syscall_blacklist
= NULL
;
217 static scmp_filter_ctx arg_seccomp
= NULL
;
219 static struct rlimit
*arg_rlimit
[_RLIMIT_MAX
] = {};
220 static bool arg_no_new_privileges
= false;
221 static int arg_oom_score_adjust
= 0;
222 static bool arg_oom_score_adjust_set
= false;
223 static CPUSet arg_cpu_set
= {};
224 static ResolvConfMode arg_resolv_conf
= RESOLV_CONF_AUTO
;
225 static TimezoneMode arg_timezone
= TIMEZONE_AUTO
;
226 static unsigned arg_console_width
= (unsigned) -1, arg_console_height
= (unsigned) -1;
227 static DeviceNode
* arg_extra_nodes
= NULL
;
228 static size_t arg_n_extra_nodes
= 0;
229 static char **arg_sysctl
= NULL
;
230 static ConsoleMode arg_console_mode
= _CONSOLE_MODE_INVALID
;
232 STATIC_DESTRUCTOR_REGISTER(arg_directory
, freep
);
233 STATIC_DESTRUCTOR_REGISTER(arg_template
, freep
);
234 STATIC_DESTRUCTOR_REGISTER(arg_chdir
, freep
);
235 STATIC_DESTRUCTOR_REGISTER(arg_pivot_root_new
, freep
);
236 STATIC_DESTRUCTOR_REGISTER(arg_pivot_root_old
, freep
);
237 STATIC_DESTRUCTOR_REGISTER(arg_user
, freep
);
238 STATIC_DESTRUCTOR_REGISTER(arg_supplementary_gids
, freep
);
239 STATIC_DESTRUCTOR_REGISTER(arg_machine
, freep
);
240 STATIC_DESTRUCTOR_REGISTER(arg_hostname
, freep
);
241 STATIC_DESTRUCTOR_REGISTER(arg_slice
, freep
);
242 STATIC_DESTRUCTOR_REGISTER(arg_setenv
, strv_freep
);
243 STATIC_DESTRUCTOR_REGISTER(arg_network_interfaces
, strv_freep
);
244 STATIC_DESTRUCTOR_REGISTER(arg_network_macvlan
, strv_freep
);
245 STATIC_DESTRUCTOR_REGISTER(arg_network_ipvlan
, strv_freep
);
246 STATIC_DESTRUCTOR_REGISTER(arg_network_veth_extra
, strv_freep
);
247 STATIC_DESTRUCTOR_REGISTER(arg_network_bridge
, freep
);
248 STATIC_DESTRUCTOR_REGISTER(arg_network_zone
, freep
);
249 STATIC_DESTRUCTOR_REGISTER(arg_network_namespace_path
, freep
);
250 STATIC_DESTRUCTOR_REGISTER(arg_image
, freep
);
251 STATIC_DESTRUCTOR_REGISTER(arg_oci_bundle
, freep
);
252 STATIC_DESTRUCTOR_REGISTER(arg_property
, strv_freep
);
253 STATIC_DESTRUCTOR_REGISTER(arg_property_message
, sd_bus_message_unrefp
);
254 STATIC_DESTRUCTOR_REGISTER(arg_parameters
, strv_freep
);
255 STATIC_DESTRUCTOR_REGISTER(arg_root_hash
, freep
);
256 STATIC_DESTRUCTOR_REGISTER(arg_syscall_whitelist
, strv_freep
);
257 STATIC_DESTRUCTOR_REGISTER(arg_syscall_blacklist
, strv_freep
);
259 STATIC_DESTRUCTOR_REGISTER(arg_seccomp
, seccomp_releasep
);
261 STATIC_DESTRUCTOR_REGISTER(arg_cpu_set
, cpu_set_reset
);
262 STATIC_DESTRUCTOR_REGISTER(arg_sysctl
, strv_freep
);
264 static int help(void) {
265 _cleanup_free_
char *link
= NULL
;
268 (void) pager_open(arg_pager_flags
);
270 r
= terminal_urlify_man("systemd-nspawn", "1", &link
);
274 printf("%1$s [OPTIONS...] [PATH] [ARGUMENTS...]\n\n"
275 "Spawn a command or OS in a light-weight container.\n\n"
276 " -h --help Show this help\n"
277 " --version Print version string\n"
278 " -q --quiet Do not show status information\n"
279 " --no-pager Do not pipe output into a pager\n"
280 " --settings=BOOLEAN Load additional settings from .nspawn file\n\n"
282 " -D --directory=PATH Root directory for the container\n"
283 " --template=PATH Initialize root directory from template directory,\n"
285 " -x --ephemeral Run container with snapshot of root directory, and\n"
286 " remove it after exit\n"
287 " -i --image=PATH Root file system disk image (or device node) for\n"
289 " --oci-bundle=PATH OCI bundle directory\n"
290 " --read-only Mount the root directory read-only\n"
291 " --volatile[=MODE] Run the system in volatile mode\n"
292 " --root-hash=HASH Specify verity root hash for root disk image\n"
293 " --pivot-root=PATH[:PATH]\n"
294 " Pivot root to given directory in the container\n\n"
295 "%3$sExecution:%4$s\n"
296 " -a --as-pid2 Maintain a stub init as PID1, invoke binary as PID2\n"
297 " -b --boot Boot up full system (i.e. invoke init)\n"
298 " --chdir=PATH Set working directory in the container\n"
299 " -E --setenv=NAME=VALUE Pass an environment variable to PID 1\n"
300 " -u --user=USER Run the command under specified user or UID\n"
301 " --kill-signal=SIGNAL Select signal to use for shutting down PID 1\n"
302 " --notify-ready=BOOLEAN Receive notifications from the child init process\n\n"
303 "%3$sSystem Identity:%4$s\n"
304 " -M --machine=NAME Set the machine name for the container\n"
305 " --hostname=NAME Override the hostname for the container\n"
306 " --uuid=UUID Set a specific machine UUID for the container\n\n"
307 "%3$sProperties:%4$s\n"
308 " -S --slice=SLICE Place the container in the specified slice\n"
309 " --property=NAME=VALUE Set scope unit property\n"
310 " --register=BOOLEAN Register container as machine\n"
311 " --keep-unit Do not register a scope for the machine, reuse\n"
312 " the service unit nspawn is running in\n\n"
313 "%3$sUser Namespacing:%4$s\n"
314 " -U --private-users=pick Run within user namespace, autoselect UID/GID range\n"
315 " --private-users[=UIDBASE[:NUIDS]]\n"
316 " Similar, but with user configured UID/GID range\n"
317 " --private-users-chown Adjust OS tree ownership to private UID/GID range\n\n"
318 "%3$sNetworking:%4$s\n"
319 " --private-network Disable network in container\n"
320 " --network-interface=INTERFACE\n"
321 " Assign an existing network interface to the\n"
323 " --network-macvlan=INTERFACE\n"
324 " Create a macvlan network interface based on an\n"
325 " existing network interface to the container\n"
326 " --network-ipvlan=INTERFACE\n"
327 " Create a ipvlan network interface based on an\n"
328 " existing network interface to the container\n"
329 " -n --network-veth Add a virtual Ethernet connection between host\n"
331 " --network-veth-extra=HOSTIF[:CONTAINERIF]\n"
332 " Add an additional virtual Ethernet link between\n"
333 " host and container\n"
334 " --network-bridge=INTERFACE\n"
335 " Add a virtual Ethernet connection to the container\n"
336 " and attach it to an existing bridge on the host\n"
337 " --network-zone=NAME Similar, but attach the new interface to an\n"
338 " an automatically managed bridge interface\n"
339 " --network-namespace-path=PATH\n"
340 " Set network namespace to the one represented by\n"
341 " the specified kernel namespace file node\n"
342 " -p --port=[PROTOCOL:]HOSTPORT[:CONTAINERPORT]\n"
343 " Expose a container IP port on the host\n\n"
344 "%3$sSecurity:%4$s\n"
345 " --capability=CAP In addition to the default, retain specified\n"
347 " --drop-capability=CAP Drop the specified capability from the default set\n"
348 " --no-new-privileges Set PR_SET_NO_NEW_PRIVS flag for container payload\n"
349 " --system-call-filter=LIST|~LIST\n"
350 " Permit/prohibit specific system calls\n"
351 " -Z --selinux-context=SECLABEL\n"
352 " Set the SELinux security context to be used by\n"
353 " processes in the container\n"
354 " -L --selinux-apifs-context=SECLABEL\n"
355 " Set the SELinux security context to be used by\n"
356 " API/tmpfs file systems in the container\n\n"
357 "%3$sResources:%4$s\n"
358 " --rlimit=NAME=LIMIT Set a resource limit for the payload\n"
359 " --oom-score-adjust=VALUE\n"
360 " Adjust the OOM score value for the payload\n"
361 " --cpu-affinity=CPUS Adjust the CPU affinity of the container\n"
362 " --personality=ARCH Pick personality for this container\n\n"
363 "%3$sIntegration:%4$s\n"
364 " --resolv-conf=MODE Select mode of /etc/resolv.conf initialization\n"
365 " --timezone=MODE Select mode of /etc/localtime initialization\n"
366 " --link-journal=MODE Link up guest journal, one of no, auto, guest, \n"
367 " host, try-guest, try-host\n"
368 " -j Equivalent to --link-journal=try-guest\n\n"
370 " --bind=PATH[:PATH[:OPTIONS]]\n"
371 " Bind mount a file or directory from the host into\n"
373 " --bind-ro=PATH[:PATH[:OPTIONS]\n"
374 " Similar, but creates a read-only bind mount\n"
375 " --inaccessible=PATH Over-mount file node with inaccessible node to mask\n"
377 " --tmpfs=PATH:[OPTIONS] Mount an empty tmpfs to the specified directory\n"
378 " --overlay=PATH[:PATH...]:PATH\n"
379 " Create an overlay mount from the host to \n"
381 " --overlay-ro=PATH[:PATH...]:PATH\n"
382 " Similar, but creates a read-only overlay mount\n\n"
383 "%3$sInput/Output:%4$s\n"
384 " --console=MODE Select how stdin/stdout/stderr and /dev/console are\n"
385 " set up for the container.\n"
386 " -P --pipe Equivalent to --console=pipe\n"
387 "\nSee the %2$s for details.\n"
388 , program_invocation_short_name
390 , ansi_underline(), ansi_normal());
395 static int custom_mount_check_all(void) {
398 for (i
= 0; i
< arg_n_custom_mounts
; i
++) {
399 CustomMount
*m
= &arg_custom_mounts
[i
];
401 if (path_equal(m
->destination
, "/") && arg_userns_mode
!= USER_NAMESPACE_NO
) {
402 if (arg_userns_chown
)
403 return log_error_errno(SYNTHETIC_ERRNO(EINVAL
),
404 "--private-users-chown may not be combined with custom root mounts.");
405 else if (arg_uid_shift
== UID_INVALID
)
406 return log_error_errno(SYNTHETIC_ERRNO(EINVAL
),
407 "--private-users with automatic UID shift may not be combined with custom root mounts.");
414 static int detect_unified_cgroup_hierarchy_from_environment(void) {
418 /* Allow the user to control whether the unified hierarchy is used */
419 e
= getenv("UNIFIED_CGROUP_HIERARCHY");
421 r
= parse_boolean(e
);
423 return log_error_errno(r
, "Failed to parse $UNIFIED_CGROUP_HIERARCHY.");
425 arg_unified_cgroup_hierarchy
= CGROUP_UNIFIED_ALL
;
427 arg_unified_cgroup_hierarchy
= CGROUP_UNIFIED_NONE
;
433 static int detect_unified_cgroup_hierarchy_from_image(const char *directory
) {
436 /* Let's inherit the mode to use from the host system, but let's take into consideration what systemd in the
437 * image actually supports. */
438 r
= cg_all_unified();
440 return log_error_errno(r
, "Failed to determine whether we are in all unified mode.");
442 /* Unified cgroup hierarchy support was added in 230. Unfortunately the detection
443 * routine only detects 231, so we'll have a false negative here for 230. */
444 r
= systemd_installation_has_version(directory
, 230);
446 return log_error_errno(r
, "Failed to determine systemd version in container: %m");
448 arg_unified_cgroup_hierarchy
= CGROUP_UNIFIED_ALL
;
450 arg_unified_cgroup_hierarchy
= CGROUP_UNIFIED_NONE
;
451 } else if (cg_unified_controller(SYSTEMD_CGROUP_CONTROLLER
) > 0) {
452 /* Mixed cgroup hierarchy support was added in 233 */
453 r
= systemd_installation_has_version(directory
, 233);
455 return log_error_errno(r
, "Failed to determine systemd version in container: %m");
457 arg_unified_cgroup_hierarchy
= CGROUP_UNIFIED_SYSTEMD
;
459 arg_unified_cgroup_hierarchy
= CGROUP_UNIFIED_NONE
;
461 arg_unified_cgroup_hierarchy
= CGROUP_UNIFIED_NONE
;
463 log_debug("Using %s hierarchy for container.",
464 arg_unified_cgroup_hierarchy
== CGROUP_UNIFIED_NONE
? "legacy" :
465 arg_unified_cgroup_hierarchy
== CGROUP_UNIFIED_SYSTEMD
? "hybrid" : "unified");
470 static void parse_share_ns_env(const char *name
, unsigned long ns_flag
) {
473 r
= getenv_bool(name
);
477 log_warning_errno(r
, "Failed to parse %s from environment, defaulting to false.", name
);
479 arg_clone_ns_flags
= (arg_clone_ns_flags
& ~ns_flag
) | (r
> 0 ? 0 : ns_flag
);
480 arg_settings_mask
|= SETTING_CLONE_NS_FLAGS
;
483 static void parse_mount_settings_env(void) {
487 r
= getenv_bool("SYSTEMD_NSPAWN_TMPFS_TMP");
489 SET_FLAG(arg_mount_settings
, MOUNT_APPLY_TMPFS_TMP
, r
> 0);
490 else if (r
!= -ENXIO
)
491 log_warning_errno(r
, "Failed to parse $SYSTEMD_NSPAWN_TMPFS_TMP, ignoring: %m");
493 e
= getenv("SYSTEMD_NSPAWN_API_VFS_WRITABLE");
497 if (streq(e
, "network")) {
498 arg_mount_settings
|= MOUNT_APPLY_APIVFS_RO
|MOUNT_APPLY_APIVFS_NETNS
;
502 r
= parse_boolean(e
);
504 log_warning_errno(r
, "Failed to parse SYSTEMD_NSPAWN_API_VFS_WRITABLE from environment, ignoring.");
508 SET_FLAG(arg_mount_settings
, MOUNT_APPLY_APIVFS_RO
, r
== 0);
509 SET_FLAG(arg_mount_settings
, MOUNT_APPLY_APIVFS_NETNS
, false);
512 static void parse_environment(void) {
516 parse_share_ns_env("SYSTEMD_NSPAWN_SHARE_NS_IPC", CLONE_NEWIPC
);
517 parse_share_ns_env("SYSTEMD_NSPAWN_SHARE_NS_PID", CLONE_NEWPID
);
518 parse_share_ns_env("SYSTEMD_NSPAWN_SHARE_NS_UTS", CLONE_NEWUTS
);
519 parse_share_ns_env("SYSTEMD_NSPAWN_SHARE_SYSTEM", CLONE_NEWIPC
|CLONE_NEWPID
|CLONE_NEWUTS
);
521 parse_mount_settings_env();
523 /* SYSTEMD_NSPAWN_USE_CGNS=0 can be used to disable CLONE_NEWCGROUP use,
524 * even if it is supported. If not supported, it has no effect. */
525 if (!cg_ns_supported())
526 arg_use_cgns
= false;
528 r
= getenv_bool("SYSTEMD_NSPAWN_USE_CGNS");
531 log_warning_errno(r
, "Failed to parse $SYSTEMD_NSPAWN_USE_CGNS, ignoring: %m");
535 arg_use_cgns
= r
> 0;
536 arg_settings_mask
|= SETTING_USE_CGNS
;
540 e
= getenv("SYSTEMD_NSPAWN_CONTAINER_SERVICE");
542 arg_container_service_name
= e
;
544 detect_unified_cgroup_hierarchy_from_environment();
547 static int parse_argv(int argc
, char *argv
[]) {
565 ARG_NETWORK_INTERFACE
,
570 ARG_NETWORK_VETH_EXTRA
,
571 ARG_NETWORK_NAMESPACE_PATH
,
581 ARG_PRIVATE_USERS_CHOWN
,
584 ARG_SYSTEM_CALL_FILTER
,
587 ARG_NO_NEW_PRIVILEGES
,
588 ARG_OOM_SCORE_ADJUST
,
598 static const struct option options
[] = {
599 { "help", no_argument
, NULL
, 'h' },
600 { "version", no_argument
, NULL
, ARG_VERSION
},
601 { "directory", required_argument
, NULL
, 'D' },
602 { "template", required_argument
, NULL
, ARG_TEMPLATE
},
603 { "ephemeral", no_argument
, NULL
, 'x' },
604 { "user", required_argument
, NULL
, 'u' },
605 { "private-network", no_argument
, NULL
, ARG_PRIVATE_NETWORK
},
606 { "as-pid2", no_argument
, NULL
, 'a' },
607 { "boot", no_argument
, NULL
, 'b' },
608 { "uuid", required_argument
, NULL
, ARG_UUID
},
609 { "read-only", no_argument
, NULL
, ARG_READ_ONLY
},
610 { "capability", required_argument
, NULL
, ARG_CAPABILITY
},
611 { "drop-capability", required_argument
, NULL
, ARG_DROP_CAPABILITY
},
612 { "no-new-privileges", required_argument
, NULL
, ARG_NO_NEW_PRIVILEGES
},
613 { "link-journal", required_argument
, NULL
, ARG_LINK_JOURNAL
},
614 { "bind", required_argument
, NULL
, ARG_BIND
},
615 { "bind-ro", required_argument
, NULL
, ARG_BIND_RO
},
616 { "tmpfs", required_argument
, NULL
, ARG_TMPFS
},
617 { "overlay", required_argument
, NULL
, ARG_OVERLAY
},
618 { "overlay-ro", required_argument
, NULL
, ARG_OVERLAY_RO
},
619 { "inaccessible", required_argument
, NULL
, ARG_INACCESSIBLE
},
620 { "machine", required_argument
, NULL
, 'M' },
621 { "hostname", required_argument
, NULL
, ARG_HOSTNAME
},
622 { "slice", required_argument
, NULL
, 'S' },
623 { "setenv", required_argument
, NULL
, 'E' },
624 { "selinux-context", required_argument
, NULL
, 'Z' },
625 { "selinux-apifs-context", required_argument
, NULL
, 'L' },
626 { "quiet", no_argument
, NULL
, 'q' },
627 { "share-system", no_argument
, NULL
, ARG_SHARE_SYSTEM
}, /* not documented */
628 { "register", required_argument
, NULL
, ARG_REGISTER
},
629 { "keep-unit", no_argument
, NULL
, ARG_KEEP_UNIT
},
630 { "network-interface", required_argument
, NULL
, ARG_NETWORK_INTERFACE
},
631 { "network-macvlan", required_argument
, NULL
, ARG_NETWORK_MACVLAN
},
632 { "network-ipvlan", required_argument
, NULL
, ARG_NETWORK_IPVLAN
},
633 { "network-veth", no_argument
, NULL
, 'n' },
634 { "network-veth-extra", required_argument
, NULL
, ARG_NETWORK_VETH_EXTRA
},
635 { "network-bridge", required_argument
, NULL
, ARG_NETWORK_BRIDGE
},
636 { "network-zone", required_argument
, NULL
, ARG_NETWORK_ZONE
},
637 { "network-namespace-path", required_argument
, NULL
, ARG_NETWORK_NAMESPACE_PATH
},
638 { "personality", required_argument
, NULL
, ARG_PERSONALITY
},
639 { "image", required_argument
, NULL
, 'i' },
640 { "volatile", optional_argument
, NULL
, ARG_VOLATILE
},
641 { "port", required_argument
, NULL
, 'p' },
642 { "property", required_argument
, NULL
, ARG_PROPERTY
},
643 { "private-users", optional_argument
, NULL
, ARG_PRIVATE_USERS
},
644 { "private-users-chown", optional_argument
, NULL
, ARG_PRIVATE_USERS_CHOWN
},
645 { "kill-signal", required_argument
, NULL
, ARG_KILL_SIGNAL
},
646 { "settings", required_argument
, NULL
, ARG_SETTINGS
},
647 { "chdir", required_argument
, NULL
, ARG_CHDIR
},
648 { "pivot-root", required_argument
, NULL
, ARG_PIVOT_ROOT
},
649 { "notify-ready", required_argument
, NULL
, ARG_NOTIFY_READY
},
650 { "root-hash", required_argument
, NULL
, ARG_ROOT_HASH
},
651 { "system-call-filter", required_argument
, NULL
, ARG_SYSTEM_CALL_FILTER
},
652 { "rlimit", required_argument
, NULL
, ARG_RLIMIT
},
653 { "oom-score-adjust", required_argument
, NULL
, ARG_OOM_SCORE_ADJUST
},
654 { "cpu-affinity", required_argument
, NULL
, ARG_CPU_AFFINITY
},
655 { "resolv-conf", required_argument
, NULL
, ARG_RESOLV_CONF
},
656 { "timezone", required_argument
, NULL
, ARG_TIMEZONE
},
657 { "console", required_argument
, NULL
, ARG_CONSOLE
},
658 { "pipe", no_argument
, NULL
, ARG_PIPE
},
659 { "oci-bundle", required_argument
, NULL
, ARG_OCI_BUNDLE
},
660 { "no-pager", no_argument
, NULL
, ARG_NO_PAGER
},
666 uint64_t plus
= 0, minus
= 0;
667 bool mask_all_settings
= false, mask_no_settings
= false;
672 while ((c
= getopt_long(argc
, argv
, "+hD:u:abL:M:jS:Z:qi:xp:nUE:P", options
, NULL
)) >= 0)
682 r
= parse_path_argument_and_warn(optarg
, false, &arg_directory
);
686 arg_settings_mask
|= SETTING_DIRECTORY
;
690 r
= parse_path_argument_and_warn(optarg
, false, &arg_template
);
694 arg_settings_mask
|= SETTING_DIRECTORY
;
698 r
= parse_path_argument_and_warn(optarg
, false, &arg_image
);
702 arg_settings_mask
|= SETTING_DIRECTORY
;
706 r
= parse_path_argument_and_warn(optarg
, false, &arg_oci_bundle
);
713 arg_ephemeral
= true;
714 arg_settings_mask
|= SETTING_EPHEMERAL
;
718 r
= free_and_strdup(&arg_user
, optarg
);
722 arg_settings_mask
|= SETTING_USER
;
725 case ARG_NETWORK_ZONE
: {
728 j
= strjoin("vz-", optarg
);
732 if (!ifname_valid(j
)) {
733 log_error("Network zone name not valid: %s", j
);
738 free_and_replace(arg_network_zone
, j
);
740 arg_network_veth
= true;
741 arg_private_network
= true;
742 arg_settings_mask
|= SETTING_NETWORK
;
746 case ARG_NETWORK_BRIDGE
:
748 if (!ifname_valid(optarg
))
749 return log_error_errno(SYNTHETIC_ERRNO(EINVAL
),
750 "Bridge interface name not valid: %s", optarg
);
752 r
= free_and_strdup(&arg_network_bridge
, optarg
);
758 arg_network_veth
= true;
759 arg_private_network
= true;
760 arg_settings_mask
|= SETTING_NETWORK
;
763 case ARG_NETWORK_VETH_EXTRA
:
764 r
= veth_extra_parse(&arg_network_veth_extra
, optarg
);
766 return log_error_errno(r
, "Failed to parse --network-veth-extra= parameter: %s", optarg
);
768 arg_private_network
= true;
769 arg_settings_mask
|= SETTING_NETWORK
;
772 case ARG_NETWORK_INTERFACE
:
773 if (!ifname_valid(optarg
))
774 return log_error_errno(SYNTHETIC_ERRNO(EINVAL
),
775 "Network interface name not valid: %s", optarg
);
777 if (strv_extend(&arg_network_interfaces
, optarg
) < 0)
780 arg_private_network
= true;
781 arg_settings_mask
|= SETTING_NETWORK
;
784 case ARG_NETWORK_MACVLAN
:
786 if (!ifname_valid(optarg
))
787 return log_error_errno(SYNTHETIC_ERRNO(EINVAL
),
788 "MACVLAN network interface name not valid: %s", optarg
);
790 if (strv_extend(&arg_network_macvlan
, optarg
) < 0)
793 arg_private_network
= true;
794 arg_settings_mask
|= SETTING_NETWORK
;
797 case ARG_NETWORK_IPVLAN
:
799 if (!ifname_valid(optarg
))
800 return log_error_errno(SYNTHETIC_ERRNO(EINVAL
),
801 "IPVLAN network interface name not valid: %s", optarg
);
803 if (strv_extend(&arg_network_ipvlan
, optarg
) < 0)
807 case ARG_PRIVATE_NETWORK
:
808 arg_private_network
= true;
809 arg_settings_mask
|= SETTING_NETWORK
;
812 case ARG_NETWORK_NAMESPACE_PATH
:
813 r
= parse_path_argument_and_warn(optarg
, false, &arg_network_namespace_path
);
817 arg_settings_mask
|= SETTING_NETWORK
;
821 if (arg_start_mode
== START_PID2
)
822 return log_error_errno(SYNTHETIC_ERRNO(EINVAL
),
823 "--boot and --as-pid2 may not be combined.");
825 arg_start_mode
= START_BOOT
;
826 arg_settings_mask
|= SETTING_START_MODE
;
830 if (arg_start_mode
== START_BOOT
)
831 return log_error_errno(SYNTHETIC_ERRNO(EINVAL
),
832 "--boot and --as-pid2 may not be combined.");
834 arg_start_mode
= START_PID2
;
835 arg_settings_mask
|= SETTING_START_MODE
;
839 r
= sd_id128_from_string(optarg
, &arg_uuid
);
841 return log_error_errno(r
, "Invalid UUID: %s", optarg
);
843 if (sd_id128_is_null(arg_uuid
))
844 return log_error_errno(SYNTHETIC_ERRNO(EINVAL
),
845 "Machine UUID may not be all zeroes.");
847 arg_settings_mask
|= SETTING_MACHINE_ID
;
851 r
= free_and_strdup(&arg_slice
, optarg
);
855 arg_settings_mask
|= SETTING_SLICE
;
860 arg_machine
= mfree(arg_machine
);
862 if (!machine_name_is_valid(optarg
))
863 return log_error_errno(SYNTHETIC_ERRNO(EINVAL
),
864 "Invalid machine name: %s", optarg
);
866 r
= free_and_strdup(&arg_machine
, optarg
);
874 arg_hostname
= mfree(arg_hostname
);
876 if (!hostname_is_valid(optarg
, false))
877 return log_error_errno(SYNTHETIC_ERRNO(EINVAL
),
878 "Invalid hostname: %s", optarg
);
880 r
= free_and_strdup(&arg_hostname
, optarg
);
885 arg_settings_mask
|= SETTING_HOSTNAME
;
889 arg_selinux_context
= optarg
;
893 arg_selinux_apifs_context
= optarg
;
897 arg_read_only
= true;
898 arg_settings_mask
|= SETTING_READ_ONLY
;
902 case ARG_DROP_CAPABILITY
: {
905 _cleanup_free_
char *t
= NULL
;
907 r
= extract_first_word(&p
, &t
, ",", 0);
909 return log_error_errno(r
, "Failed to parse capability %s.", t
);
913 if (streq(t
, "all")) {
914 if (c
== ARG_CAPABILITY
)
915 plus
= (uint64_t) -1;
917 minus
= (uint64_t) -1;
919 r
= capability_from_name(t
);
921 return log_error_errno(r
, "Failed to parse capability %s.", t
);
923 if (c
== ARG_CAPABILITY
)
930 arg_settings_mask
|= SETTING_CAPABILITY
;
934 case ARG_NO_NEW_PRIVILEGES
:
935 r
= parse_boolean(optarg
);
937 return log_error_errno(r
, "Failed to parse --no-new-privileges= argument: %s", optarg
);
939 arg_no_new_privileges
= r
;
940 arg_settings_mask
|= SETTING_NO_NEW_PRIVILEGES
;
944 arg_link_journal
= LINK_GUEST
;
945 arg_link_journal_try
= true;
946 arg_settings_mask
|= SETTING_LINK_JOURNAL
;
949 case ARG_LINK_JOURNAL
:
950 r
= parse_link_journal(optarg
, &arg_link_journal
, &arg_link_journal_try
);
952 return log_error_errno(r
, "Failed to parse link journal mode %s", optarg
);
954 arg_settings_mask
|= SETTING_LINK_JOURNAL
;
959 r
= bind_mount_parse(&arg_custom_mounts
, &arg_n_custom_mounts
, optarg
, c
== ARG_BIND_RO
);
961 return log_error_errno(r
, "Failed to parse --bind(-ro)= argument %s: %m", optarg
);
963 arg_settings_mask
|= SETTING_CUSTOM_MOUNTS
;
967 r
= tmpfs_mount_parse(&arg_custom_mounts
, &arg_n_custom_mounts
, optarg
);
969 return log_error_errno(r
, "Failed to parse --tmpfs= argument %s: %m", optarg
);
971 arg_settings_mask
|= SETTING_CUSTOM_MOUNTS
;
976 r
= overlay_mount_parse(&arg_custom_mounts
, &arg_n_custom_mounts
, optarg
, c
== ARG_OVERLAY_RO
);
977 if (r
== -EADDRNOTAVAIL
)
978 return log_error_errno(r
, "--overlay(-ro)= needs at least two colon-separated directories specified.");
980 return log_error_errno(r
, "Failed to parse --overlay(-ro)= argument %s: %m", optarg
);
982 arg_settings_mask
|= SETTING_CUSTOM_MOUNTS
;
985 case ARG_INACCESSIBLE
:
986 r
= inaccessible_mount_parse(&arg_custom_mounts
, &arg_n_custom_mounts
, optarg
);
988 return log_error_errno(r
, "Failed to parse --inaccessible= argument %s: %m", optarg
);
990 arg_settings_mask
|= SETTING_CUSTOM_MOUNTS
;
996 if (!env_assignment_is_valid(optarg
))
997 return log_error_errno(SYNTHETIC_ERRNO(EINVAL
),
998 "Environment variable assignment '%s' is not valid.", optarg
);
1000 n
= strv_env_set(arg_setenv
, optarg
);
1004 strv_free_and_replace(arg_setenv
, n
);
1005 arg_settings_mask
|= SETTING_ENVIRONMENT
;
1013 case ARG_SHARE_SYSTEM
:
1014 /* We don't officially support this anymore, except for compat reasons. People should use the
1015 * $SYSTEMD_NSPAWN_SHARE_* environment variables instead. */
1016 log_warning("Please do not use --share-system anymore, use $SYSTEMD_NSPAWN_SHARE_* instead.");
1017 arg_clone_ns_flags
= 0;
1021 r
= parse_boolean(optarg
);
1023 log_error("Failed to parse --register= argument: %s", optarg
);
1031 arg_keep_unit
= true;
1034 case ARG_PERSONALITY
:
1036 arg_personality
= personality_from_string(optarg
);
1037 if (arg_personality
== PERSONALITY_INVALID
)
1038 return log_error_errno(SYNTHETIC_ERRNO(EINVAL
),
1039 "Unknown or unsupported personality '%s'.", optarg
);
1041 arg_settings_mask
|= SETTING_PERSONALITY
;
1047 arg_volatile_mode
= VOLATILE_YES
;
1048 else if (streq(optarg
, "help")) {
1049 DUMP_STRING_TABLE(volatile_mode
, VolatileMode
, _VOLATILE_MODE_MAX
);
1054 m
= volatile_mode_from_string(optarg
);
1056 return log_error_errno(SYNTHETIC_ERRNO(EINVAL
),
1057 "Failed to parse --volatile= argument: %s", optarg
);
1059 arg_volatile_mode
= m
;
1062 arg_settings_mask
|= SETTING_VOLATILE_MODE
;
1066 r
= expose_port_parse(&arg_expose_ports
, optarg
);
1068 return log_error_errno(r
, "Duplicate port specification: %s", optarg
);
1070 return log_error_errno(r
, "Failed to parse host port %s: %m", optarg
);
1072 arg_settings_mask
|= SETTING_EXPOSE_PORTS
;
1076 if (strv_extend(&arg_property
, optarg
) < 0)
1081 case ARG_PRIVATE_USERS
: {
1086 else if (!in_charset(optarg
, DIGITS
))
1087 /* do *not* parse numbers as booleans */
1088 boolean
= parse_boolean(optarg
);
1090 if (boolean
== false) {
1091 /* no: User namespacing off */
1092 arg_userns_mode
= USER_NAMESPACE_NO
;
1093 arg_uid_shift
= UID_INVALID
;
1094 arg_uid_range
= UINT32_C(0x10000);
1095 } else if (boolean
== true) {
1096 /* yes: User namespacing on, UID range is read from root dir */
1097 arg_userns_mode
= USER_NAMESPACE_FIXED
;
1098 arg_uid_shift
= UID_INVALID
;
1099 arg_uid_range
= UINT32_C(0x10000);
1100 } else if (streq(optarg
, "pick")) {
1101 /* pick: User namespacing on, UID range is picked randomly */
1102 arg_userns_mode
= USER_NAMESPACE_PICK
;
1103 arg_uid_shift
= UID_INVALID
;
1104 arg_uid_range
= UINT32_C(0x10000);
1106 _cleanup_free_
char *buffer
= NULL
;
1107 const char *range
, *shift
;
1109 /* anything else: User namespacing on, UID range is explicitly configured */
1111 range
= strchr(optarg
, ':');
1113 buffer
= strndup(optarg
, range
- optarg
);
1119 r
= safe_atou32(range
, &arg_uid_range
);
1121 return log_error_errno(r
, "Failed to parse UID range \"%s\": %m", range
);
1125 r
= parse_uid(shift
, &arg_uid_shift
);
1127 return log_error_errno(r
, "Failed to parse UID \"%s\": %m", optarg
);
1129 arg_userns_mode
= USER_NAMESPACE_FIXED
;
1132 if (arg_uid_range
<= 0)
1133 return log_error_errno(SYNTHETIC_ERRNO(EINVAL
),
1134 "UID range cannot be 0.");
1136 arg_settings_mask
|= SETTING_USERNS
;
1141 if (userns_supported()) {
1142 arg_userns_mode
= USER_NAMESPACE_PICK
;
1143 arg_uid_shift
= UID_INVALID
;
1144 arg_uid_range
= UINT32_C(0x10000);
1146 arg_settings_mask
|= SETTING_USERNS
;
1151 case ARG_PRIVATE_USERS_CHOWN
:
1152 arg_userns_chown
= true;
1154 arg_settings_mask
|= SETTING_USERNS
;
1157 case ARG_KILL_SIGNAL
:
1158 if (streq(optarg
, "help")) {
1159 DUMP_STRING_TABLE(signal
, int, _NSIG
);
1163 arg_kill_signal
= signal_from_string(optarg
);
1164 if (arg_kill_signal
< 0)
1165 return log_error_errno(SYNTHETIC_ERRNO(EINVAL
),
1166 "Cannot parse signal: %s", optarg
);
1168 arg_settings_mask
|= SETTING_KILL_SIGNAL
;
1173 /* no → do not read files
1174 * yes → read files, do not override cmdline, trust only subset
1175 * override → read files, override cmdline, trust only subset
1176 * trusted → read files, do not override cmdline, trust all
1179 r
= parse_boolean(optarg
);
1181 if (streq(optarg
, "trusted")) {
1182 mask_all_settings
= false;
1183 mask_no_settings
= false;
1184 arg_settings_trusted
= true;
1186 } else if (streq(optarg
, "override")) {
1187 mask_all_settings
= false;
1188 mask_no_settings
= true;
1189 arg_settings_trusted
= -1;
1191 return log_error_errno(r
, "Failed to parse --settings= argument: %s", optarg
);
1194 mask_all_settings
= false;
1195 mask_no_settings
= false;
1196 arg_settings_trusted
= -1;
1199 mask_all_settings
= true;
1200 mask_no_settings
= false;
1201 arg_settings_trusted
= false;
1207 if (!path_is_absolute(optarg
))
1208 return log_error_errno(SYNTHETIC_ERRNO(EINVAL
),
1209 "Working directory %s is not an absolute path.", optarg
);
1211 r
= free_and_strdup(&arg_chdir
, optarg
);
1215 arg_settings_mask
|= SETTING_WORKING_DIRECTORY
;
1218 case ARG_PIVOT_ROOT
:
1219 r
= pivot_root_parse(&arg_pivot_root_new
, &arg_pivot_root_old
, optarg
);
1221 return log_error_errno(r
, "Failed to parse --pivot-root= argument %s: %m", optarg
);
1223 arg_settings_mask
|= SETTING_PIVOT_ROOT
;
1226 case ARG_NOTIFY_READY
:
1227 r
= parse_boolean(optarg
);
1229 return log_error_errno(SYNTHETIC_ERRNO(EINVAL
),
1230 "%s is not a valid notify mode. Valid modes are: yes, no, and ready.", optarg
);
1231 arg_notify_ready
= r
;
1232 arg_settings_mask
|= SETTING_NOTIFY_READY
;
1235 case ARG_ROOT_HASH
: {
1239 r
= unhexmem(optarg
, strlen(optarg
), &k
, &l
);
1241 return log_error_errno(r
, "Failed to parse root hash: %s", optarg
);
1242 if (l
< sizeof(sd_id128_t
)) {
1244 return log_error_errno(SYNTHETIC_ERRNO(EINVAL
), "Root hash must be at least 128bit long: %s", optarg
);
1247 free(arg_root_hash
);
1249 arg_root_hash_size
= l
;
1253 case ARG_SYSTEM_CALL_FILTER
: {
1257 negative
= optarg
[0] == '~';
1258 items
= negative
? optarg
+ 1 : optarg
;
1261 _cleanup_free_
char *word
= NULL
;
1263 r
= extract_first_word(&items
, &word
, NULL
, 0);
1269 return log_error_errno(r
, "Failed to parse system call filter: %m");
1272 r
= strv_extend(&arg_syscall_blacklist
, word
);
1274 r
= strv_extend(&arg_syscall_whitelist
, word
);
1279 arg_settings_mask
|= SETTING_SYSCALL_FILTER
;
1285 _cleanup_free_
char *name
= NULL
;
1288 if (streq(optarg
, "help")) {
1289 DUMP_STRING_TABLE(rlimit
, int, _RLIMIT_MAX
);
1293 eq
= strchr(optarg
, '=');
1295 return log_error_errno(SYNTHETIC_ERRNO(EINVAL
),
1296 "--rlimit= expects an '=' assignment.");
1298 name
= strndup(optarg
, eq
- optarg
);
1302 rl
= rlimit_from_string_harder(name
);
1304 return log_error_errno(SYNTHETIC_ERRNO(EINVAL
),
1305 "Unknown resource limit: %s", name
);
1307 if (!arg_rlimit
[rl
]) {
1308 arg_rlimit
[rl
] = new0(struct rlimit
, 1);
1309 if (!arg_rlimit
[rl
])
1313 r
= rlimit_parse(rl
, eq
+ 1, arg_rlimit
[rl
]);
1315 return log_error_errno(r
, "Failed to parse resource limit: %s", eq
+ 1);
1317 arg_settings_mask
|= SETTING_RLIMIT_FIRST
<< rl
;
1321 case ARG_OOM_SCORE_ADJUST
:
1322 r
= parse_oom_score_adjust(optarg
, &arg_oom_score_adjust
);
1324 return log_error_errno(r
, "Failed to parse --oom-score-adjust= parameter: %s", optarg
);
1326 arg_oom_score_adjust_set
= true;
1327 arg_settings_mask
|= SETTING_OOM_SCORE_ADJUST
;
1330 case ARG_CPU_AFFINITY
: {
1333 r
= parse_cpu_set(optarg
, &cpuset
);
1335 return log_error_errno(r
, "Failed to parse CPU affinity mask %s: %m", optarg
);
1337 cpu_set_reset(&arg_cpu_set
);
1338 arg_cpu_set
= cpuset
;
1339 arg_settings_mask
|= SETTING_CPU_AFFINITY
;
1343 case ARG_RESOLV_CONF
:
1344 if (streq(optarg
, "help")) {
1345 DUMP_STRING_TABLE(resolv_conf_mode
, ResolvConfMode
, _RESOLV_CONF_MODE_MAX
);
1349 arg_resolv_conf
= resolv_conf_mode_from_string(optarg
);
1350 if (arg_resolv_conf
< 0)
1351 return log_error_errno(SYNTHETIC_ERRNO(EINVAL
),
1352 "Failed to parse /etc/resolv.conf mode: %s", optarg
);
1354 arg_settings_mask
|= SETTING_RESOLV_CONF
;
1358 if (streq(optarg
, "help")) {
1359 DUMP_STRING_TABLE(timezone_mode
, TimezoneMode
, _TIMEZONE_MODE_MAX
);
1363 arg_timezone
= timezone_mode_from_string(optarg
);
1364 if (arg_timezone
< 0)
1365 return log_error_errno(SYNTHETIC_ERRNO(EINVAL
),
1366 "Failed to parse /etc/localtime mode: %s", optarg
);
1368 arg_settings_mask
|= SETTING_TIMEZONE
;
1372 if (streq(optarg
, "interactive"))
1373 arg_console_mode
= CONSOLE_INTERACTIVE
;
1374 else if (streq(optarg
, "read-only"))
1375 arg_console_mode
= CONSOLE_READ_ONLY
;
1376 else if (streq(optarg
, "passive"))
1377 arg_console_mode
= CONSOLE_PASSIVE
;
1378 else if (streq(optarg
, "pipe"))
1379 arg_console_mode
= CONSOLE_PIPE
;
1380 else if (streq(optarg
, "help"))
1381 puts("interactive\n"
1386 return log_error_errno(SYNTHETIC_ERRNO(EINVAL
), "Unknown console mode: %s", optarg
);
1388 arg_settings_mask
|= SETTING_CONSOLE_MODE
;
1393 arg_console_mode
= CONSOLE_PIPE
;
1394 arg_settings_mask
|= SETTING_CONSOLE_MODE
;
1398 arg_pager_flags
|= PAGER_DISABLE
;
1405 assert_not_reached("Unhandled option");
1408 if (argc
> optind
) {
1409 strv_free(arg_parameters
);
1410 arg_parameters
= strv_copy(argv
+ optind
);
1411 if (!arg_parameters
)
1414 arg_settings_mask
|= SETTING_START_MODE
;
1417 if (arg_ephemeral
&& arg_template
&& !arg_directory
)
1418 /* User asked for ephemeral execution but specified --template= instead of --directory=. Semantically
1419 * such an invocation makes some sense, see https://github.com/systemd/systemd/issues/3667. Let's
1420 * accept this here, and silently make "--ephemeral --template=" equivalent to "--ephemeral
1422 arg_directory
= TAKE_PTR(arg_template
);
1424 arg_caps_retain
= (arg_caps_retain
| plus
| (arg_private_network
? UINT64_C(1) << CAP_NET_ADMIN
: 0)) & ~minus
;
1426 /* Make sure to parse environment before we reset the settings mask below */
1427 parse_environment();
1429 /* Load all settings from .nspawn files */
1430 if (mask_no_settings
)
1431 arg_settings_mask
= 0;
1433 /* Don't load any settings from .nspawn files */
1434 if (mask_all_settings
)
1435 arg_settings_mask
= _SETTINGS_MASK_ALL
;
1440 static int verify_arguments(void) {
1443 if (arg_userns_mode
!= USER_NAMESPACE_NO
)
1444 arg_mount_settings
|= MOUNT_USE_USERNS
;
1446 if (arg_private_network
)
1447 arg_mount_settings
|= MOUNT_APPLY_APIVFS_NETNS
;
1449 if (!(arg_clone_ns_flags
& CLONE_NEWPID
) ||
1450 !(arg_clone_ns_flags
& CLONE_NEWUTS
)) {
1451 arg_register
= false;
1452 if (arg_start_mode
!= START_PID1
)
1453 return log_error_errno(SYNTHETIC_ERRNO(EINVAL
), "--boot cannot be used without namespacing.");
1456 if (arg_userns_mode
== USER_NAMESPACE_PICK
)
1457 arg_userns_chown
= true;
1459 if (arg_start_mode
== START_BOOT
&& arg_kill_signal
<= 0)
1460 arg_kill_signal
= SIGRTMIN
+3;
1462 if (arg_volatile_mode
!= VOLATILE_NO
) /* Make sure all file systems contained in the image are mounted read-only if we are in volatile mode */
1463 arg_read_only
= true;
1465 if (arg_keep_unit
&& arg_register
&& cg_pid_get_owner_uid(0, NULL
) >= 0)
1466 /* Save the user from accidentally registering either user-$SESSION.scope or user@.service.
1467 * The latter is not technically a user session, but we don't need to labour the point. */
1468 return log_error_errno(SYNTHETIC_ERRNO(EINVAL
), "--keep-unit --register=yes may not be used when invoked from a user session.");
1470 if (arg_directory
&& arg_image
)
1471 return log_error_errno(SYNTHETIC_ERRNO(EINVAL
), "--directory= and --image= may not be combined.");
1473 if (arg_template
&& arg_image
)
1474 return log_error_errno(SYNTHETIC_ERRNO(EINVAL
), "--template= and --image= may not be combined.");
1476 if (arg_template
&& !(arg_directory
|| arg_machine
))
1477 return log_error_errno(SYNTHETIC_ERRNO(EINVAL
), "--template= needs --directory= or --machine=.");
1479 if (arg_ephemeral
&& arg_template
)
1480 return log_error_errno(SYNTHETIC_ERRNO(EINVAL
), "--ephemeral and --template= may not be combined.");
1482 if (arg_ephemeral
&& !IN_SET(arg_link_journal
, LINK_NO
, LINK_AUTO
))
1483 return log_error_errno(SYNTHETIC_ERRNO(EINVAL
), "--ephemeral and --link-journal= may not be combined.");
1485 if (arg_userns_mode
!= USER_NAMESPACE_NO
&& !userns_supported())
1486 return log_error_errno(SYNTHETIC_ERRNO(EOPNOTSUPP
), "--private-users= is not supported, kernel compiled without user namespace support.");
1488 if (arg_userns_chown
&& arg_read_only
)
1489 return log_error_errno(SYNTHETIC_ERRNO(EINVAL
),
1490 "--read-only and --private-users-chown may not be combined.");
1492 /* We don't support --private-users-chown together with any of the volatile modes since we couldn't
1493 * change the read-only part of the tree (i.e. /usr) anyway, or because it would trigger a massive
1494 * copy-up (in case of overlay) making the entire exercise pointless. */
1495 if (arg_userns_chown
&& arg_volatile_mode
!= VOLATILE_NO
)
1496 return log_error_errno(SYNTHETIC_ERRNO(EINVAL
), "--volatile= and --private-users-chown may not be combined.");
1498 /* If --network-namespace-path is given with any other network-related option, we need to error out,
1499 * to avoid conflicts between different network options. */
1500 if (arg_network_namespace_path
&&
1501 (arg_network_interfaces
|| arg_network_macvlan
||
1502 arg_network_ipvlan
|| arg_network_veth_extra
||
1503 arg_network_bridge
|| arg_network_zone
||
1504 arg_network_veth
|| arg_private_network
))
1505 return log_error_errno(SYNTHETIC_ERRNO(EINVAL
), "--network-namespace-path= cannot be combined with other network options.");
1507 if (arg_network_bridge
&& arg_network_zone
)
1508 return log_error_errno(SYNTHETIC_ERRNO(EINVAL
),
1509 "--network-bridge= and --network-zone= may not be combined.");
1511 if (arg_userns_mode
!= USER_NAMESPACE_NO
&& (arg_mount_settings
& MOUNT_APPLY_APIVFS_NETNS
) && !arg_private_network
)
1512 return log_error_errno(SYNTHETIC_ERRNO(EINVAL
), "Invalid namespacing settings. Mounting sysfs with --private-users requires --private-network.");
1514 if (arg_userns_mode
!= USER_NAMESPACE_NO
&& !(arg_mount_settings
& MOUNT_APPLY_APIVFS_RO
))
1515 return log_error_errno(SYNTHETIC_ERRNO(EINVAL
), "Cannot combine --private-users with read-write mounts.");
1517 if (arg_expose_ports
&& !arg_private_network
)
1518 return log_error_errno(SYNTHETIC_ERRNO(EINVAL
), "Cannot use --port= without private networking.");
1521 if (arg_expose_ports
)
1522 return log_error_errno(SYNTHETIC_ERRNO(EOPNOTSUPP
), "--port= is not supported, compiled without libiptc support.");
1525 r
= custom_mount_check_all();
1532 static int userns_lchown(const char *p
, uid_t uid
, gid_t gid
) {
1535 if (arg_userns_mode
== USER_NAMESPACE_NO
)
1538 if (uid
== UID_INVALID
&& gid
== GID_INVALID
)
1541 if (uid
!= UID_INVALID
) {
1542 uid
+= arg_uid_shift
;
1544 if (uid
< arg_uid_shift
|| uid
>= arg_uid_shift
+ arg_uid_range
)
1548 if (gid
!= GID_INVALID
) {
1549 gid
+= (gid_t
) arg_uid_shift
;
1551 if (gid
< (gid_t
) arg_uid_shift
|| gid
>= (gid_t
) (arg_uid_shift
+ arg_uid_range
))
1555 if (lchown(p
, uid
, gid
) < 0)
1561 static int userns_mkdir(const char *root
, const char *path
, mode_t mode
, uid_t uid
, gid_t gid
) {
1565 q
= prefix_roota(root
, path
);
1566 r
= mkdir_errno_wrapper(q
, mode
);
1572 return userns_lchown(q
, uid
, gid
);
1575 static const char *timezone_from_path(const char *path
) {
1576 return PATH_STARTSWITH_SET(
1578 "../usr/share/zoneinfo/",
1579 "/usr/share/zoneinfo/");
1582 static bool etc_writable(void) {
1583 return !arg_read_only
|| IN_SET(arg_volatile_mode
, VOLATILE_YES
, VOLATILE_OVERLAY
);
1586 static int setup_timezone(const char *dest
) {
1587 _cleanup_free_
char *p
= NULL
, *etc
= NULL
;
1588 const char *where
, *check
;
1594 if (IN_SET(arg_timezone
, TIMEZONE_AUTO
, TIMEZONE_SYMLINK
)) {
1595 r
= readlink_malloc("/etc/localtime", &p
);
1596 if (r
== -ENOENT
&& arg_timezone
== TIMEZONE_AUTO
)
1597 m
= etc_writable() ? TIMEZONE_DELETE
: TIMEZONE_OFF
;
1598 else if (r
== -EINVAL
&& arg_timezone
== TIMEZONE_AUTO
) /* regular file? */
1599 m
= etc_writable() ? TIMEZONE_COPY
: TIMEZONE_BIND
;
1601 log_warning_errno(r
, "Failed to read host's /etc/localtime symlink, not updating container timezone: %m");
1602 /* To handle warning, delete /etc/localtime and replace it with a symbolic link to a time zone data
1606 * ln -s /usr/share/zoneinfo/UTC /etc/localtime
1609 } else if (arg_timezone
== TIMEZONE_AUTO
)
1610 m
= etc_writable() ? TIMEZONE_SYMLINK
: TIMEZONE_BIND
;
1616 if (m
== TIMEZONE_OFF
)
1619 r
= chase_symlinks("/etc", dest
, CHASE_PREFIX_ROOT
, &etc
);
1621 log_warning_errno(r
, "Failed to resolve /etc path in container, ignoring: %m");
1625 where
= strjoina(etc
, "/localtime");
1629 case TIMEZONE_DELETE
:
1630 if (unlink(where
) < 0)
1631 log_full_errno(errno
== ENOENT
? LOG_DEBUG
: LOG_WARNING
, errno
, "Failed to remove '%s', ignoring: %m", where
);
1635 case TIMEZONE_SYMLINK
: {
1636 _cleanup_free_
char *q
= NULL
;
1637 const char *z
, *what
;
1639 z
= timezone_from_path(p
);
1641 log_warning("/etc/localtime does not point into /usr/share/zoneinfo/, not updating container timezone.");
1645 r
= readlink_malloc(where
, &q
);
1646 if (r
>= 0 && streq_ptr(timezone_from_path(q
), z
))
1647 return 0; /* Already pointing to the right place? Then do nothing .. */
1649 check
= strjoina(dest
, "/usr/share/zoneinfo/", z
);
1650 r
= chase_symlinks(check
, dest
, 0, NULL
);
1652 log_debug_errno(r
, "Timezone %s does not exist (or is not accessible) in container, not creating symlink: %m", z
);
1654 if (unlink(where
) < 0 && errno
!= ENOENT
) {
1655 log_full_errno(IN_SET(errno
, EROFS
, EACCES
, EPERM
) ? LOG_DEBUG
: LOG_WARNING
, /* Don't complain on read-only images */
1656 errno
, "Failed to remove existing timezone info %s in container, ignoring: %m", where
);
1660 what
= strjoina("../usr/share/zoneinfo/", z
);
1661 if (symlink(what
, where
) < 0) {
1662 log_full_errno(IN_SET(errno
, EROFS
, EACCES
, EPERM
) ? LOG_DEBUG
: LOG_WARNING
,
1663 errno
, "Failed to correct timezone of container, ignoring: %m");
1673 case TIMEZONE_BIND
: {
1674 _cleanup_free_
char *resolved
= NULL
;
1677 found
= chase_symlinks(where
, dest
, CHASE_NONEXISTENT
, &resolved
);
1679 log_warning_errno(found
, "Failed to resolve /etc/localtime path in container, ignoring: %m");
1683 if (found
== 0) /* missing? */
1684 (void) touch(resolved
);
1686 r
= mount_verbose(LOG_WARNING
, "/etc/localtime", resolved
, NULL
, MS_BIND
, NULL
);
1688 return mount_verbose(LOG_ERR
, NULL
, resolved
, NULL
, MS_BIND
|MS_REMOUNT
|MS_RDONLY
|MS_NOSUID
|MS_NODEV
, NULL
);
1694 /* If mounting failed, try to copy */
1695 r
= copy_file_atomic("/etc/localtime", where
, 0644, 0, 0, COPY_REFLINK
|COPY_REPLACE
);
1697 log_full_errno(IN_SET(r
, -EROFS
, -EACCES
, -EPERM
) ? LOG_DEBUG
: LOG_WARNING
, r
,
1698 "Failed to copy /etc/localtime to %s, ignoring: %m", where
);
1705 assert_not_reached("unexpected mode");
1708 /* Fix permissions of the symlink or file copy we just created */
1709 r
= userns_lchown(where
, 0, 0);
1711 log_warning_errno(r
, "Failed to chown /etc/localtime, ignoring: %m");
1716 static int have_resolv_conf(const char *path
) {
1719 if (access(path
, F_OK
) < 0) {
1720 if (errno
== ENOENT
)
1723 return log_debug_errno(errno
, "Failed to determine whether '%s' is available: %m", path
);
1729 static int resolved_listening(void) {
1730 _cleanup_(sd_bus_error_free
) sd_bus_error error
= SD_BUS_ERROR_NULL
;
1731 _cleanup_(sd_bus_flush_close_unrefp
) sd_bus
*bus
= NULL
;
1732 _cleanup_free_
char *dns_stub_listener_mode
= NULL
;
1735 /* Check if resolved is listening */
1737 r
= sd_bus_open_system(&bus
);
1739 return log_debug_errno(r
, "Failed to open system bus: %m");
1741 r
= bus_name_has_owner(bus
, "org.freedesktop.resolve1", NULL
);
1743 return log_debug_errno(r
, "Failed to check whether the 'org.freedesktop.resolve1' bus name is taken: %m");
1747 r
= sd_bus_get_property_string(bus
,
1748 "org.freedesktop.resolve1",
1749 "/org/freedesktop/resolve1",
1750 "org.freedesktop.resolve1.Manager",
1753 &dns_stub_listener_mode
);
1755 return log_debug_errno(r
, "Failed to query DNSStubListener property: %s", bus_error_message(&error
, r
));
1757 return STR_IN_SET(dns_stub_listener_mode
, "udp", "yes");
1760 static int setup_resolv_conf(const char *dest
) {
1761 _cleanup_free_
char *etc
= NULL
;
1762 const char *where
, *what
;
1768 if (arg_resolv_conf
== RESOLV_CONF_AUTO
) {
1769 if (arg_private_network
)
1770 m
= RESOLV_CONF_OFF
;
1771 else if (have_resolv_conf(STATIC_RESOLV_CONF
) > 0 && resolved_listening() > 0)
1772 m
= etc_writable() ? RESOLV_CONF_COPY_STATIC
: RESOLV_CONF_BIND_STATIC
;
1773 else if (have_resolv_conf("/etc/resolv.conf") > 0)
1774 m
= etc_writable() ? RESOLV_CONF_COPY_HOST
: RESOLV_CONF_BIND_HOST
;
1776 m
= etc_writable() ? RESOLV_CONF_DELETE
: RESOLV_CONF_OFF
;
1778 m
= arg_resolv_conf
;
1780 if (m
== RESOLV_CONF_OFF
)
1783 r
= chase_symlinks("/etc", dest
, CHASE_PREFIX_ROOT
, &etc
);
1785 log_warning_errno(r
, "Failed to resolve /etc path in container, ignoring: %m");
1789 where
= strjoina(etc
, "/resolv.conf");
1791 if (m
== RESOLV_CONF_DELETE
) {
1792 if (unlink(where
) < 0)
1793 log_full_errno(errno
== ENOENT
? LOG_DEBUG
: LOG_WARNING
, errno
, "Failed to remove '%s', ignoring: %m", where
);
1798 if (IN_SET(m
, RESOLV_CONF_BIND_STATIC
, RESOLV_CONF_COPY_STATIC
))
1799 what
= STATIC_RESOLV_CONF
;
1801 what
= "/etc/resolv.conf";
1803 if (IN_SET(m
, RESOLV_CONF_BIND_HOST
, RESOLV_CONF_BIND_STATIC
)) {
1804 _cleanup_free_
char *resolved
= NULL
;
1807 found
= chase_symlinks(where
, dest
, CHASE_NONEXISTENT
, &resolved
);
1809 log_warning_errno(found
, "Failed to resolve /etc/resolv.conf path in container, ignoring: %m");
1813 if (found
== 0) /* missing? */
1814 (void) touch(resolved
);
1816 r
= mount_verbose(LOG_WARNING
, what
, resolved
, NULL
, MS_BIND
, NULL
);
1818 return mount_verbose(LOG_ERR
, NULL
, resolved
, NULL
, MS_BIND
|MS_REMOUNT
|MS_RDONLY
|MS_NOSUID
|MS_NODEV
, NULL
);
1821 /* If that didn't work, let's copy the file */
1822 r
= copy_file(what
, where
, O_TRUNC
|O_NOFOLLOW
, 0644, 0, 0, COPY_REFLINK
);
1824 /* If the file already exists as symlink, let's suppress the warning, under the assumption that
1825 * resolved or something similar runs inside and the symlink points there.
1827 * If the disk image is read-only, there's also no point in complaining.
1829 log_full_errno(!IN_SET(RESOLV_CONF_COPY_HOST
, RESOLV_CONF_COPY_STATIC
) && IN_SET(r
, -ELOOP
, -EROFS
, -EACCES
, -EPERM
) ? LOG_DEBUG
: LOG_WARNING
, r
,
1830 "Failed to copy /etc/resolv.conf to %s, ignoring: %m", where
);
1834 r
= userns_lchown(where
, 0, 0);
1836 log_warning_errno(r
, "Failed to chown /etc/resolv.conf, ignoring: %m");
1841 static int setup_boot_id(void) {
1842 _cleanup_(unlink_and_freep
) char *from
= NULL
;
1843 _cleanup_free_
char *path
= NULL
;
1844 sd_id128_t rnd
= SD_ID128_NULL
;
1848 /* Generate a new randomized boot ID, so that each boot-up of the container gets a new one */
1850 r
= tempfn_random_child("/run", "proc-sys-kernel-random-boot-id", &path
);
1852 return log_error_errno(r
, "Failed to generate random boot ID path: %m");
1854 r
= sd_id128_randomize(&rnd
);
1856 return log_error_errno(r
, "Failed to generate random boot id: %m");
1858 r
= id128_write(path
, ID128_UUID
, rnd
, false);
1860 return log_error_errno(r
, "Failed to write boot id: %m");
1862 from
= TAKE_PTR(path
);
1863 to
= "/proc/sys/kernel/random/boot_id";
1865 r
= mount_verbose(LOG_ERR
, from
, to
, NULL
, MS_BIND
, NULL
);
1869 return mount_verbose(LOG_ERR
, NULL
, to
, NULL
, MS_BIND
|MS_REMOUNT
|MS_RDONLY
|MS_NOSUID
|MS_NOEXEC
|MS_NODEV
, NULL
);
1872 static int copy_devnodes(const char *dest
) {
1873 static const char devnodes
[] =
1882 _cleanup_umask_ mode_t u
;
1890 /* Create /dev/net, so that we can create /dev/net/tun in it */
1891 if (userns_mkdir(dest
, "/dev/net", 0755, 0, 0) < 0)
1892 return log_error_errno(r
, "Failed to create /dev/net directory: %m");
1894 NULSTR_FOREACH(d
, devnodes
) {
1895 _cleanup_free_
char *from
= NULL
, *to
= NULL
;
1898 from
= path_join("/dev/", d
);
1902 to
= path_join(dest
, from
);
1906 if (stat(from
, &st
) < 0) {
1908 if (errno
!= ENOENT
)
1909 return log_error_errno(errno
, "Failed to stat %s: %m", from
);
1911 } else if (!S_ISCHR(st
.st_mode
) && !S_ISBLK(st
.st_mode
))
1912 return log_error_errno(SYNTHETIC_ERRNO(EIO
),
1913 "%s is not a char or block device, cannot copy.", from
);
1915 _cleanup_free_
char *sl
= NULL
, *prefixed
= NULL
, *dn
= NULL
, *t
= NULL
;
1917 if (mknod(to
, st
.st_mode
, st
.st_rdev
) < 0) {
1918 /* Explicitly warn the user when /dev is already populated. */
1919 if (errno
== EEXIST
)
1920 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
);
1922 return log_error_errno(errno
, "mknod(%s) failed: %m", to
);
1924 /* Some systems abusively restrict mknod but allow bind mounts. */
1927 return log_error_errno(r
, "touch (%s) failed: %m", to
);
1928 r
= mount_verbose(LOG_DEBUG
, from
, to
, NULL
, MS_BIND
, NULL
);
1930 return log_error_errno(r
, "Both mknod and bind mount (%s) failed: %m", to
);
1933 r
= userns_lchown(to
, 0, 0);
1935 return log_error_errno(r
, "chown() of device node %s failed: %m", to
);
1937 dn
= path_join("/dev", S_ISCHR(st
.st_mode
) ? "char" : "block");
1941 r
= userns_mkdir(dest
, dn
, 0755, 0, 0);
1943 return log_error_errno(r
, "Failed to create '%s': %m", dn
);
1945 if (asprintf(&sl
, "%s/%u:%u", dn
, major(st
.st_rdev
), minor(st
.st_rdev
)) < 0)
1948 prefixed
= path_join(dest
, sl
);
1952 t
= path_join("..", d
);
1956 if (symlink(t
, prefixed
) < 0)
1957 log_debug_errno(errno
, "Failed to symlink '%s' to '%s': %m", t
, prefixed
);
1964 static int make_extra_nodes(const char *dest
) {
1965 _cleanup_umask_ mode_t u
;
1971 for (i
= 0; i
< arg_n_extra_nodes
; i
++) {
1972 _cleanup_free_
char *path
= NULL
;
1973 DeviceNode
*n
= arg_extra_nodes
+ i
;
1975 path
= path_join(dest
, n
->path
);
1979 if (mknod(path
, n
->mode
, S_ISCHR(n
->mode
) || S_ISBLK(n
->mode
) ? makedev(n
->major
, n
->minor
) : 0) < 0)
1980 return log_error_errno(errno
, "Failed to create device node '%s': %m", path
);
1982 r
= chmod_and_chown(path
, n
->mode
, n
->uid
, n
->gid
);
1984 return log_error_errno(r
, "Failed to adjust device node ownership of '%s': %m", path
);
1990 static int setup_pts(const char *dest
) {
1991 _cleanup_free_
char *options
= NULL
;
1996 if (arg_selinux_apifs_context
)
1997 (void) asprintf(&options
,
1998 "newinstance,ptmxmode=0666,mode=620,gid=" GID_FMT
",context=\"%s\"",
1999 arg_uid_shift
+ TTY_GID
,
2000 arg_selinux_apifs_context
);
2003 (void) asprintf(&options
,
2004 "newinstance,ptmxmode=0666,mode=620,gid=" GID_FMT
,
2005 arg_uid_shift
+ TTY_GID
);
2010 /* Mount /dev/pts itself */
2011 p
= prefix_roota(dest
, "/dev/pts");
2012 r
= mkdir_errno_wrapper(p
, 0755);
2014 return log_error_errno(r
, "Failed to create /dev/pts: %m");
2016 r
= mount_verbose(LOG_ERR
, "devpts", p
, "devpts", MS_NOSUID
|MS_NOEXEC
, options
);
2019 r
= userns_lchown(p
, 0, 0);
2021 return log_error_errno(r
, "Failed to chown /dev/pts: %m");
2023 /* Create /dev/ptmx symlink */
2024 p
= prefix_roota(dest
, "/dev/ptmx");
2025 if (symlink("pts/ptmx", p
) < 0)
2026 return log_error_errno(errno
, "Failed to create /dev/ptmx symlink: %m");
2027 r
= userns_lchown(p
, 0, 0);
2029 return log_error_errno(r
, "Failed to chown /dev/ptmx: %m");
2031 /* And fix /dev/pts/ptmx ownership */
2032 p
= prefix_roota(dest
, "/dev/pts/ptmx");
2033 r
= userns_lchown(p
, 0, 0);
2035 return log_error_errno(r
, "Failed to chown /dev/pts/ptmx: %m");
2040 static int setup_stdio_as_dev_console(void) {
2044 terminal
= open_terminal("/dev/console", O_RDWR
);
2046 return log_error_errno(terminal
, "Failed to open console: %m");
2048 /* Make sure we can continue logging to the original stderr, even if
2049 * stderr points elsewhere now */
2050 r
= log_dup_console();
2052 return log_error_errno(r
, "Failed to duplicate stderr: %m");
2054 /* invalidates 'terminal' on success and failure */
2055 r
= rearrange_stdio(terminal
, terminal
, terminal
);
2057 return log_error_errno(r
, "Failed to move console to stdin/stdout/stderr: %m");
2062 static int setup_dev_console(const char *console
) {
2063 _cleanup_free_
char *p
= NULL
;
2066 /* Create /dev/console symlink */
2067 r
= path_make_relative("/dev", console
, &p
);
2069 return log_error_errno(r
, "Failed to create relative path: %m");
2071 if (symlink(p
, "/dev/console") < 0)
2072 return log_error_errno(errno
, "Failed to create /dev/console symlink: %m");
2077 static int setup_keyring(void) {
2078 key_serial_t keyring
;
2080 /* Allocate a new session keyring for the container. This makes sure the keyring of the session systemd-nspawn
2081 * was invoked from doesn't leak into the container. Note that by default we block keyctl() and request_key()
2082 * anyway via seccomp so doing this operation isn't strictly necessary, but in case people explicitly whitelist
2083 * these system calls let's make sure we don't leak anything into the container. */
2085 keyring
= keyctl(KEYCTL_JOIN_SESSION_KEYRING
, 0, 0, 0, 0);
2086 if (keyring
== -1) {
2087 if (errno
== ENOSYS
)
2088 log_debug_errno(errno
, "Kernel keyring not supported, ignoring.");
2089 else if (IN_SET(errno
, EACCES
, EPERM
))
2090 log_debug_errno(errno
, "Kernel keyring access prohibited, ignoring.");
2092 return log_error_errno(errno
, "Setting up kernel keyring failed: %m");
2098 static int setup_kmsg(int kmsg_socket
) {
2099 _cleanup_(unlink_and_freep
) char *from
= NULL
;
2100 _cleanup_free_
char *fifo
= NULL
;
2101 _cleanup_close_
int fd
= -1;
2102 _cleanup_umask_ mode_t u
;
2105 assert(kmsg_socket
>= 0);
2109 /* We create the kmsg FIFO as as temporary file in /run, but immediately delete it after bind mounting it to
2110 * /proc/kmsg. While FIFOs on the reading side behave very similar to /proc/kmsg, their writing side behaves
2111 * differently from /dev/kmsg in that writing blocks when nothing is reading. In order to avoid any problems
2112 * with containers deadlocking due to this we simply make /dev/kmsg unavailable to the container. */
2114 r
= tempfn_random_child("/run", "proc-kmsg", &fifo
);
2116 return log_error_errno(r
, "Failed to generate kmsg path: %m");
2118 if (mkfifo(fifo
, 0600) < 0)
2119 return log_error_errno(errno
, "mkfifo() for /run/kmsg failed: %m");
2121 from
= TAKE_PTR(fifo
);
2123 r
= mount_verbose(LOG_ERR
, from
, "/proc/kmsg", NULL
, MS_BIND
, NULL
);
2127 fd
= open(from
, O_RDWR
|O_NONBLOCK
|O_CLOEXEC
);
2129 return log_error_errno(errno
, "Failed to open fifo: %m");
2131 /* Store away the fd in the socket, so that it stays open as long as we run the child */
2132 r
= send_one_fd(kmsg_socket
, fd
, 0);
2134 return log_error_errno(r
, "Failed to send FIFO fd: %m");
2139 static int on_address_change(sd_netlink
*rtnl
, sd_netlink_message
*m
, void *userdata
) {
2140 union in_addr_union
*exposed
= userdata
;
2146 expose_port_execute(rtnl
, arg_expose_ports
, exposed
);
2150 static int setup_hostname(void) {
2153 if ((arg_clone_ns_flags
& CLONE_NEWUTS
) == 0)
2156 r
= sethostname_idempotent(arg_hostname
?: arg_machine
);
2158 return log_error_errno(r
, "Failed to set hostname: %m");
2163 static int setup_journal(const char *directory
) {
2164 _cleanup_free_
char *d
= NULL
;
2165 const char *dirname
, *p
, *q
;
2171 /* Don't link journals in ephemeral mode */
2175 if (arg_link_journal
== LINK_NO
)
2178 try = arg_link_journal_try
|| arg_link_journal
== LINK_AUTO
;
2180 r
= sd_id128_get_machine(&this_id
);
2182 return log_error_errno(r
, "Failed to retrieve machine ID: %m");
2184 if (sd_id128_equal(arg_uuid
, this_id
)) {
2185 log_full(try ? LOG_WARNING
: LOG_ERR
,
2186 "Host and machine ids are equal (%s): refusing to link journals", sd_id128_to_string(arg_uuid
, id
));
2192 FOREACH_STRING(dirname
, "/var", "/var/log", "/var/log/journal") {
2193 r
= userns_mkdir(directory
, dirname
, 0755, 0, 0);
2195 bool ignore
= r
== -EROFS
&& try;
2196 log_full_errno(ignore
? LOG_DEBUG
: LOG_ERR
, r
,
2197 "Failed to create %s%s: %m", dirname
, ignore
? ", ignoring" : "");
2198 return ignore
? 0 : r
;
2202 (void) sd_id128_to_string(arg_uuid
, id
);
2204 p
= strjoina("/var/log/journal/", id
);
2205 q
= prefix_roota(directory
, p
);
2207 if (path_is_mount_point(p
, NULL
, 0) > 0) {
2211 return log_error_errno(SYNTHETIC_ERRNO(EEXIST
),
2212 "%s: already a mount point, refusing to use for journal", p
);
2215 if (path_is_mount_point(q
, NULL
, 0) > 0) {
2219 return log_error_errno(SYNTHETIC_ERRNO(EEXIST
),
2220 "%s: already a mount point, refusing to use for journal", q
);
2223 r
= readlink_and_make_absolute(p
, &d
);
2225 if (IN_SET(arg_link_journal
, LINK_GUEST
, LINK_AUTO
) &&
2228 r
= userns_mkdir(directory
, p
, 0755, 0, 0);
2230 log_warning_errno(r
, "Failed to create directory %s: %m", q
);
2235 return log_error_errno(errno
, "Failed to remove symlink %s: %m", p
);
2236 } else if (r
== -EINVAL
) {
2238 if (arg_link_journal
== LINK_GUEST
&&
2241 if (errno
== ENOTDIR
) {
2242 log_error("%s already exists and is neither a symlink nor a directory", p
);
2245 return log_error_errno(errno
, "Failed to remove %s: %m", p
);
2247 } else if (r
!= -ENOENT
)
2248 return log_error_errno(r
, "readlink(%s) failed: %m", p
);
2250 if (arg_link_journal
== LINK_GUEST
) {
2252 if (symlink(q
, p
) < 0) {
2254 log_debug_errno(errno
, "Failed to symlink %s to %s, skipping journal setup: %m", q
, p
);
2257 return log_error_errno(errno
, "Failed to symlink %s to %s: %m", q
, p
);
2260 r
= userns_mkdir(directory
, p
, 0755, 0, 0);
2262 log_warning_errno(r
, "Failed to create directory %s: %m", q
);
2266 if (arg_link_journal
== LINK_HOST
) {
2267 /* don't create parents here — if the host doesn't have
2268 * permanent journal set up, don't force it here */
2270 r
= mkdir_errno_wrapper(p
, 0755);
2271 if (r
< 0 && r
!= -EEXIST
) {
2273 log_debug_errno(r
, "Failed to create %s, skipping journal setup: %m", p
);
2276 return log_error_errno(r
, "Failed to create %s: %m", p
);
2279 } else if (access(p
, F_OK
) < 0)
2282 if (dir_is_empty(q
) == 0)
2283 log_warning("%s is not empty, proceeding anyway.", q
);
2285 r
= userns_mkdir(directory
, p
, 0755, 0, 0);
2287 return log_error_errno(r
, "Failed to create %s: %m", q
);
2289 r
= mount_verbose(LOG_DEBUG
, p
, q
, NULL
, MS_BIND
, NULL
);
2291 return log_error_errno(errno
, "Failed to bind mount journal from host into guest: %m");
2296 static int drop_capabilities(uid_t uid
) {
2297 CapabilityQuintet q
;
2299 /* Let's initialize all five capability sets to something valid. If the quintet was configured via
2300 * OCI use that, but fill in missing bits. If it wasn't then derive the quintet in full from
2301 * arg_caps_retain. */
2303 if (capability_quintet_is_set(&arg_full_capabilities
)) {
2304 q
= arg_full_capabilities
;
2306 if (q
.bounding
== (uint64_t) -1)
2307 q
.bounding
= uid
== 0 ? arg_caps_retain
: 0;
2309 if (q
.effective
== (uint64_t) -1)
2310 q
.effective
= uid
== 0 ? q
.bounding
: 0;
2312 if (q
.inheritable
== (uint64_t) -1)
2313 q
.inheritable
= uid
== 0 ? q
.bounding
: 0;
2315 if (q
.permitted
== (uint64_t) -1)
2316 q
.permitted
= uid
== 0 ? q
.bounding
: 0;
2318 if (q
.ambient
== (uint64_t) -1 && ambient_capabilities_supported())
2321 if (capability_quintet_mangle(&q
))
2322 return log_error_errno(SYNTHETIC_ERRNO(EPERM
), "Cannot set capabilities that are not in the current bounding set.");
2325 q
= (CapabilityQuintet
) {
2326 .bounding
= arg_caps_retain
,
2327 .effective
= uid
== 0 ? arg_caps_retain
: 0,
2328 .inheritable
= uid
== 0 ? arg_caps_retain
: 0,
2329 .permitted
= uid
== 0 ? arg_caps_retain
: 0,
2330 .ambient
= ambient_capabilities_supported() ? 0 : (uint64_t) -1,
2333 /* If we're not using OCI, proceed with mangled capabilities (so we don't error out)
2334 * in order to maintain the same behavior as systemd < 242. */
2335 if (capability_quintet_mangle(&q
))
2336 log_warning("Some capabilities will not be set because they are not in the current bounding set.");
2340 return capability_quintet_enforce(&q
);
2343 static int reset_audit_loginuid(void) {
2344 _cleanup_free_
char *p
= NULL
;
2347 if ((arg_clone_ns_flags
& CLONE_NEWPID
) == 0)
2350 r
= read_one_line_file("/proc/self/loginuid", &p
);
2354 return log_error_errno(r
, "Failed to read /proc/self/loginuid: %m");
2356 /* Already reset? */
2357 if (streq(p
, "4294967295"))
2360 r
= write_string_file("/proc/self/loginuid", "4294967295", WRITE_STRING_FILE_DISABLE_BUFFER
);
2363 "Failed to reset audit login UID. This probably means that your kernel is too\n"
2364 "old and you have audit enabled. Note that the auditing subsystem is known to\n"
2365 "be incompatible with containers on old kernels. Please make sure to upgrade\n"
2366 "your kernel or to off auditing with 'audit=0' on the kernel command line before\n"
2367 "using systemd-nspawn. Sleeping for 5s... (%m)");
2375 static int setup_propagate(const char *root
) {
2379 (void) mkdir_p("/run/systemd/nspawn/", 0755);
2380 (void) mkdir_p("/run/systemd/nspawn/propagate", 0600);
2381 p
= strjoina("/run/systemd/nspawn/propagate/", arg_machine
);
2382 (void) mkdir_p(p
, 0600);
2384 r
= userns_mkdir(root
, "/run/systemd", 0755, 0, 0);
2386 return log_error_errno(r
, "Failed to create /run/systemd: %m");
2388 r
= userns_mkdir(root
, "/run/systemd/nspawn", 0755, 0, 0);
2390 return log_error_errno(r
, "Failed to create /run/systemd/nspawn: %m");
2392 r
= userns_mkdir(root
, "/run/systemd/nspawn/incoming", 0600, 0, 0);
2394 return log_error_errno(r
, "Failed to create /run/systemd/nspawn/incoming: %m");
2396 q
= prefix_roota(root
, "/run/systemd/nspawn/incoming");
2397 r
= mount_verbose(LOG_ERR
, p
, q
, NULL
, MS_BIND
, NULL
);
2401 r
= mount_verbose(LOG_ERR
, NULL
, q
, NULL
, MS_BIND
|MS_REMOUNT
|MS_RDONLY
, NULL
);
2405 /* machined will MS_MOVE into that directory, and that's only
2406 * supported for non-shared mounts. */
2407 return mount_verbose(LOG_ERR
, NULL
, q
, NULL
, MS_SLAVE
, NULL
);
2410 static int setup_machine_id(const char *directory
) {
2411 const char *etc_machine_id
;
2415 /* If the UUID in the container is already set, then that's what counts, and we use. If it isn't set, and the
2416 * caller passed --uuid=, then we'll pass it in the $container_uuid env var to PID 1 of the container. The
2417 * assumption is that PID 1 will then write it to /etc/machine-id to make it persistent. If --uuid= is not
2418 * passed we generate a random UUID, and pass it via $container_uuid. In effect this means that /etc/machine-id
2419 * in the container and our idea of the container UUID will always be in sync (at least if PID 1 in the
2420 * container behaves nicely). */
2422 etc_machine_id
= prefix_roota(directory
, "/etc/machine-id");
2424 r
= id128_read(etc_machine_id
, ID128_PLAIN
, &id
);
2426 if (!IN_SET(r
, -ENOENT
, -ENOMEDIUM
)) /* If the file is missing or empty, we don't mind */
2427 return log_error_errno(r
, "Failed to read machine ID from container image: %m");
2429 if (sd_id128_is_null(arg_uuid
)) {
2430 r
= sd_id128_randomize(&arg_uuid
);
2432 return log_error_errno(r
, "Failed to acquire randomized machine UUID: %m");
2435 if (sd_id128_is_null(id
))
2436 return log_error_errno(SYNTHETIC_ERRNO(EINVAL
),
2437 "Machine ID in container image is zero, refusing.");
2445 static int recursive_chown(const char *directory
, uid_t shift
, uid_t range
) {
2450 if (arg_userns_mode
== USER_NAMESPACE_NO
|| !arg_userns_chown
)
2453 r
= path_patch_uid(directory
, arg_uid_shift
, arg_uid_range
);
2454 if (r
== -EOPNOTSUPP
)
2455 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.");
2457 return log_error_errno(r
, "Upper 16 bits of root directory UID and GID do not match.");
2459 return log_error_errno(r
, "Failed to adjust UID/GID shift of OS tree: %m");
2461 log_debug("Root directory of image is already owned by the right UID/GID range, skipping recursive chown operation.");
2463 log_debug("Patched directory tree to match UID/GID range.");
2470 * < 0 : wait_for_terminate() failed to get the state of the
2471 * container, the container was terminated by a signal, or
2472 * failed for an unknown reason. No change is made to the
2473 * container argument.
2474 * > 0 : The program executed in the container terminated with an
2475 * error. The exit code of the program executed in the
2476 * container is returned. The container argument has been set
2477 * to CONTAINER_TERMINATED.
2478 * 0 : The container is being rebooted, has been shut down or exited
2479 * successfully. The container argument has been set to either
2480 * CONTAINER_TERMINATED or CONTAINER_REBOOTED.
2482 * That is, success is indicated by a return value of zero, and an
2483 * error is indicated by a non-zero value.
2485 static int wait_for_container(pid_t pid
, ContainerStatus
*container
) {
2489 r
= wait_for_terminate(pid
, &status
);
2491 return log_warning_errno(r
, "Failed to wait for container: %m");
2493 switch (status
.si_code
) {
2496 if (status
.si_status
== 0)
2497 log_full(arg_quiet
? LOG_DEBUG
: LOG_INFO
, "Container %s exited successfully.", arg_machine
);
2499 log_full(arg_quiet
? LOG_DEBUG
: LOG_INFO
, "Container %s failed with error code %i.", arg_machine
, status
.si_status
);
2501 *container
= CONTAINER_TERMINATED
;
2502 return status
.si_status
;
2505 if (status
.si_status
== SIGINT
) {
2506 log_full(arg_quiet
? LOG_DEBUG
: LOG_INFO
, "Container %s has been shut down.", arg_machine
);
2507 *container
= CONTAINER_TERMINATED
;
2510 } else if (status
.si_status
== SIGHUP
) {
2511 log_full(arg_quiet
? LOG_DEBUG
: LOG_INFO
, "Container %s is being rebooted.", arg_machine
);
2512 *container
= CONTAINER_REBOOTED
;
2518 return log_error_errno(SYNTHETIC_ERRNO(EIO
),
2519 "Container %s terminated by signal %s.", arg_machine
, signal_to_string(status
.si_status
));
2522 return log_error_errno(SYNTHETIC_ERRNO(EIO
),
2523 "Container %s failed due to unknown reason.", arg_machine
);
2527 static int on_orderly_shutdown(sd_event_source
*s
, const struct signalfd_siginfo
*si
, void *userdata
) {
2530 pid
= PTR_TO_PID(userdata
);
2532 if (kill(pid
, arg_kill_signal
) >= 0) {
2533 log_info("Trying to halt container. Send SIGTERM again to trigger immediate termination.");
2534 sd_event_source_set_userdata(s
, NULL
);
2539 sd_event_exit(sd_event_source_get_event(s
), 0);
2543 static int on_sigchld(sd_event_source
*s
, const struct signalfd_siginfo
*ssi
, void *userdata
) {
2549 pid
= PTR_TO_PID(userdata
);
2554 if (waitid(P_ALL
, 0, &si
, WNOHANG
|WNOWAIT
|WEXITED
) < 0)
2555 return log_error_errno(errno
, "Failed to waitid(): %m");
2556 if (si
.si_pid
== 0) /* No pending children. */
2558 if (si
.si_pid
== pid
) {
2559 /* The main process we care for has exited. Return from
2560 * signal handler but leave the zombie. */
2561 sd_event_exit(sd_event_source_get_event(s
), 0);
2565 /* Reap all other children. */
2566 (void) waitid(P_PID
, si
.si_pid
, &si
, WNOHANG
|WEXITED
);
2572 static int on_request_stop(sd_bus_message
*m
, void *userdata
, sd_bus_error
*error
) {
2577 pid
= PTR_TO_PID(userdata
);
2579 if (arg_kill_signal
> 0) {
2580 log_info("Container termination requested. Attempting to halt container.");
2581 (void) kill(pid
, arg_kill_signal
);
2583 log_info("Container termination requested. Exiting.");
2584 sd_event_exit(sd_bus_get_event(sd_bus_message_get_bus(m
)), 0);
2590 static int determine_names(void) {
2593 if (arg_template
&& !arg_directory
&& arg_machine
) {
2595 /* If --template= was specified then we should not
2596 * search for a machine, but instead create a new one
2597 * in /var/lib/machine. */
2599 arg_directory
= path_join("/var/lib/machines", arg_machine
);
2604 if (!arg_image
&& !arg_directory
) {
2606 _cleanup_(image_unrefp
) Image
*i
= NULL
;
2608 r
= image_find(IMAGE_MACHINE
, arg_machine
, &i
);
2610 return log_error_errno(r
, "No image for machine '%s'.", arg_machine
);
2612 return log_error_errno(r
, "Failed to find image for machine '%s': %m", arg_machine
);
2614 if (IN_SET(i
->type
, IMAGE_RAW
, IMAGE_BLOCK
))
2615 r
= free_and_strdup(&arg_image
, i
->path
);
2617 r
= free_and_strdup(&arg_directory
, i
->path
);
2622 arg_read_only
= arg_read_only
|| i
->read_only
;
2624 r
= safe_getcwd(&arg_directory
);
2626 return log_error_errno(r
, "Failed to determine current directory: %m");
2629 if (!arg_directory
&& !arg_image
)
2630 return log_error_errno(SYNTHETIC_ERRNO(EINVAL
), "Failed to determine path, please use -D or -i.");
2634 if (arg_directory
&& path_equal(arg_directory
, "/"))
2635 arg_machine
= gethostname_malloc();
2640 arg_machine
= strdup(basename(arg_image
));
2642 /* Truncate suffix if there is one */
2643 e
= endswith(arg_machine
, ".raw");
2647 arg_machine
= strdup(basename(arg_directory
));
2652 hostname_cleanup(arg_machine
);
2653 if (!machine_name_is_valid(arg_machine
))
2654 return log_error_errno(SYNTHETIC_ERRNO(EINVAL
), "Failed to determine machine name automatically, please use -M.");
2656 if (arg_ephemeral
) {
2659 /* Add a random suffix when this is an
2660 * ephemeral machine, so that we can run many
2661 * instances at once without manually having
2662 * to specify -M each time. */
2664 if (asprintf(&b
, "%s-%016" PRIx64
, arg_machine
, random_u64()) < 0)
2675 static int chase_symlinks_and_update(char **p
, unsigned flags
) {
2684 r
= chase_symlinks(*p
, NULL
, flags
, &chased
);
2686 return log_error_errno(r
, "Failed to resolve path %s: %m", *p
);
2688 free_and_replace(*p
, chased
);
2689 return r
; /* r might be an fd here in case we ever use CHASE_OPEN in flags */
2692 static int determine_uid_shift(const char *directory
) {
2695 if (arg_userns_mode
== USER_NAMESPACE_NO
) {
2700 if (arg_uid_shift
== UID_INVALID
) {
2703 r
= stat(directory
, &st
);
2705 return log_error_errno(errno
, "Failed to determine UID base of %s: %m", directory
);
2707 arg_uid_shift
= st
.st_uid
& UINT32_C(0xffff0000);
2709 if (arg_uid_shift
!= (st
.st_gid
& UINT32_C(0xffff0000)))
2710 return log_error_errno(SYNTHETIC_ERRNO(EINVAL
),
2711 "UID and GID base of %s don't match.", directory
);
2713 arg_uid_range
= UINT32_C(0x10000);
2716 if (arg_uid_shift
> (uid_t
) -1 - arg_uid_range
)
2717 return log_error_errno(SYNTHETIC_ERRNO(EINVAL
),
2718 "UID base too high for UID range.");
2723 static unsigned long effective_clone_ns_flags(void) {
2724 unsigned long flags
= arg_clone_ns_flags
;
2726 if (arg_private_network
)
2727 flags
|= CLONE_NEWNET
;
2729 flags
|= CLONE_NEWCGROUP
;
2730 if (arg_userns_mode
!= USER_NAMESPACE_NO
)
2731 flags
|= CLONE_NEWUSER
;
2736 static int patch_sysctl(void) {
2738 /* This table is inspired by runc's sysctl() function */
2739 static const struct {
2742 unsigned long clone_flags
;
2744 { "kernel.hostname", false, CLONE_NEWUTS
},
2745 { "kernel.domainname", false, CLONE_NEWUTS
},
2746 { "kernel.msgmax", false, CLONE_NEWIPC
},
2747 { "kernel.msgmnb", false, CLONE_NEWIPC
},
2748 { "kernel.msgmni", false, CLONE_NEWIPC
},
2749 { "kernel.sem", false, CLONE_NEWIPC
},
2750 { "kernel.shmall", false, CLONE_NEWIPC
},
2751 { "kernel.shmmax", false, CLONE_NEWIPC
},
2752 { "kernel.shmmni", false, CLONE_NEWIPC
},
2753 { "fs.mqueue.", true, CLONE_NEWIPC
},
2754 { "net.", true, CLONE_NEWNET
},
2757 unsigned long flags
;
2761 flags
= effective_clone_ns_flags();
2763 STRV_FOREACH_PAIR(k
, v
, arg_sysctl
) {
2767 for (i
= 0; i
< ELEMENTSOF(safe_sysctl
); i
++) {
2769 if (!FLAGS_SET(flags
, safe_sysctl
[i
].clone_flags
))
2772 if (safe_sysctl
[i
].prefix
)
2773 good
= startswith(*k
, safe_sysctl
[i
].key
);
2775 good
= streq(*k
, safe_sysctl
[i
].key
);
2782 return log_error_errno(SYNTHETIC_ERRNO(EPERM
), "Refusing to write to sysctl '%s', as it is not safe in the selected namespaces.", *k
);
2784 r
= sysctl_write(*k
, *v
);
2786 return log_error_errno(r
, "Failed to write sysctl '%s': %m", *k
);
2792 static int inner_child(
2794 const char *directory
,
2798 int master_pty_socket
,
2801 _cleanup_free_
char *home
= NULL
;
2804 const char *envp
[] = {
2805 "PATH=" DEFAULT_PATH_COMPAT
,
2806 NULL
, /* container */
2811 NULL
, /* container_uuid */
2812 NULL
, /* LISTEN_FDS */
2813 NULL
, /* LISTEN_PID */
2814 NULL
, /* NOTIFY_SOCKET */
2817 const char *exec_target
;
2818 _cleanup_strv_free_
char **env_use
= NULL
;
2819 int r
, which_failed
;
2821 /* This is the "inner" child process, i.e. the one forked off by the "outer" child process, which is the one
2822 * the container manager itself forked off. At the time of clone() it gained its own CLONE_NEWNS, CLONE_NEWPID,
2823 * CLONE_NEWUTS, CLONE_NEWIPC, CLONE_NEWUSER namespaces. Note that it has its own CLONE_NEWNS namespace,
2824 * separate from the CLONE_NEWNS created for the "outer" child, and also separate from the host's CLONE_NEWNS
2825 * namespace. The reason for having two levels of CLONE_NEWNS namespaces is that the "inner" one is owned by
2826 * the CLONE_NEWUSER namespace of the container, while the "outer" one is owned by the host's CLONE_NEWUSER
2829 * Note at this point we have no CLONE_NEWNET namespace yet. We'll acquire that one later through
2830 * unshare(). See below. */
2834 assert(kmsg_socket
>= 0);
2836 log_debug("Inner child is initializing.");
2838 if (arg_userns_mode
!= USER_NAMESPACE_NO
) {
2839 /* Tell the parent, that it now can write the UID map. */
2840 (void) barrier_place(barrier
); /* #1 */
2842 /* Wait until the parent wrote the UID map */
2843 if (!barrier_place_and_sync(barrier
)) /* #2 */
2844 return log_error_errno(SYNTHETIC_ERRNO(ESRCH
),
2845 "Parent died too early");
2848 r
= reset_uid_gid();
2850 return log_error_errno(r
, "Couldn't become new root: %m");
2853 arg_mount_settings
| MOUNT_IN_USERNS
,
2855 arg_selinux_apifs_context
);
2859 if (!arg_network_namespace_path
&& arg_private_network
) {
2860 r
= unshare(CLONE_NEWNET
);
2862 return log_error_errno(errno
, "Failed to unshare network namespace: %m");
2864 /* Tell the parent that it can setup network interfaces. */
2865 (void) barrier_place(barrier
); /* #3 */
2868 r
= mount_sysfs(NULL
, arg_mount_settings
);
2872 /* Wait until we are cgroup-ified, so that we
2873 * can mount the right cgroup path writable */
2874 if (!barrier_place_and_sync(barrier
)) /* #4 */
2875 return log_error_errno(SYNTHETIC_ERRNO(ESRCH
),
2876 "Parent died too early");
2879 r
= unshare(CLONE_NEWCGROUP
);
2881 return log_error_errno(errno
, "Failed to unshare cgroup namespace: %m");
2884 arg_unified_cgroup_hierarchy
,
2885 arg_userns_mode
!= USER_NAMESPACE_NO
,
2888 arg_selinux_apifs_context
,
2893 r
= mount_systemd_cgroup_writable("", arg_unified_cgroup_hierarchy
);
2898 r
= setup_boot_id();
2902 r
= setup_kmsg(kmsg_socket
);
2905 kmsg_socket
= safe_close(kmsg_socket
);
2910 arg_n_custom_mounts
,
2914 arg_selinux_apifs_context
,
2920 return log_error_errno(errno
, "setsid() failed: %m");
2922 if (arg_private_network
)
2925 if (arg_expose_ports
) {
2926 r
= expose_port_send_rtnl(rtnl_socket
);
2929 rtnl_socket
= safe_close(rtnl_socket
);
2932 if (arg_console_mode
!= CONSOLE_PIPE
) {
2933 _cleanup_close_
int master
= -1;
2934 _cleanup_free_
char *console
= NULL
;
2936 /* Allocate a pty and make it available as /dev/console. */
2937 master
= openpt_allocate(O_RDWR
|O_NONBLOCK
, &console
);
2939 return log_error_errno(master
, "Failed to allocate a pty: %m");
2941 r
= setup_dev_console(console
);
2943 return log_error_errno(r
, "Failed to setup /dev/console: %m");
2945 r
= send_one_fd(master_pty_socket
, master
, 0);
2947 return log_error_errno(r
, "Failed to send master fd: %m");
2948 master_pty_socket
= safe_close(master_pty_socket
);
2950 r
= setup_stdio_as_dev_console();
2959 if (arg_oom_score_adjust_set
) {
2960 r
= set_oom_score_adjust(arg_oom_score_adjust
);
2962 return log_error_errno(r
, "Failed to adjust OOM score: %m");
2965 if (arg_cpu_set
.set
)
2966 if (sched_setaffinity(0, arg_cpu_set
.allocated
, arg_cpu_set
.set
) < 0)
2967 return log_error_errno(errno
, "Failed to set CPU affinity: %m");
2969 (void) setup_hostname();
2971 if (arg_personality
!= PERSONALITY_INVALID
) {
2972 r
= safe_personality(arg_personality
);
2974 return log_error_errno(r
, "personality() failed: %m");
2975 } else if (secondary
) {
2976 r
= safe_personality(PER_LINUX32
);
2978 return log_error_errno(r
, "personality() failed: %m");
2981 r
= setrlimit_closest_all((const struct rlimit
*const*) arg_rlimit
, &which_failed
);
2983 return log_error_errno(r
, "Failed to apply resource limit RLIMIT_%s: %m", rlimit_to_string(which_failed
));
2988 if (is_seccomp_available()) {
2990 r
= seccomp_load(arg_seccomp
);
2991 if (ERRNO_IS_SECCOMP_FATAL(r
))
2992 return log_error_errno(r
, "Failed to install seccomp filter: %m");
2994 log_debug_errno(r
, "Failed to install seccomp filter: %m");
2999 r
= setup_seccomp(arg_caps_retain
, arg_syscall_whitelist
, arg_syscall_blacklist
);
3005 if (arg_selinux_context
)
3006 if (setexeccon(arg_selinux_context
) < 0)
3007 return log_error_errno(errno
, "setexeccon(\"%s\") failed: %m", arg_selinux_context
);
3010 /* Make sure we keep the caps across the uid/gid dropping, so that we can retain some selected caps
3011 * if we need to later on. */
3012 if (prctl(PR_SET_KEEPCAPS
, 1) < 0)
3013 return log_error_errno(errno
, "Failed to set PR_SET_KEEPCAPS: %m");
3015 if (uid_is_valid(arg_uid
) || gid_is_valid(arg_gid
))
3016 r
= change_uid_gid_raw(arg_uid
, arg_gid
, arg_supplementary_gids
, arg_n_supplementary_gids
);
3018 r
= change_uid_gid(arg_user
, &home
);
3022 r
= drop_capabilities(getuid());
3024 return log_error_errno(r
, "Dropping capabilities failed: %m");
3026 if (arg_no_new_privileges
)
3027 if (prctl(PR_SET_NO_NEW_PRIVS
, 1, 0, 0, 0) < 0)
3028 return log_error_errno(errno
, "Failed to disable new privileges: %m");
3030 /* LXC sets container=lxc, so follow the scheme here */
3031 envp
[n_env
++] = strjoina("container=", arg_container_service_name
);
3033 envp
[n_env
] = strv_find_prefix(environ
, "TERM=");
3037 if (home
|| !uid_is_valid(arg_uid
) || arg_uid
== 0)
3038 if (asprintf((char**)(envp
+ n_env
++), "HOME=%s", home
?: "/root") < 0)
3041 if (arg_user
|| !uid_is_valid(arg_uid
) || arg_uid
== 0)
3042 if (asprintf((char**)(envp
+ n_env
++), "USER=%s", arg_user
?: "root") < 0 ||
3043 asprintf((char**)(envp
+ n_env
++), "LOGNAME=%s", arg_user
? arg_user
: "root") < 0)
3046 assert(!sd_id128_is_null(arg_uuid
));
3048 if (asprintf((char**)(envp
+ n_env
++), "container_uuid=%s", id128_to_uuid_string(arg_uuid
, as_uuid
)) < 0)
3051 if (fdset_size(fds
) > 0) {
3052 r
= fdset_cloexec(fds
, false);
3054 return log_error_errno(r
, "Failed to unset O_CLOEXEC for file descriptors.");
3056 if ((asprintf((char **)(envp
+ n_env
++), "LISTEN_FDS=%u", fdset_size(fds
)) < 0) ||
3057 (asprintf((char **)(envp
+ n_env
++), "LISTEN_PID=1") < 0))
3060 if (asprintf((char **)(envp
+ n_env
++), "NOTIFY_SOCKET=%s", NSPAWN_NOTIFY_SOCKET_PATH
) < 0)
3063 env_use
= strv_env_merge(2, envp
, arg_setenv
);
3067 /* Let the parent know that we are ready and
3068 * wait until the parent is ready with the
3070 if (!barrier_place_and_sync(barrier
)) /* #5 */
3071 return log_error_errno(SYNTHETIC_ERRNO(ESRCH
),
3072 "Parent died too early");
3075 if (chdir(arg_chdir
) < 0)
3076 return log_error_errno(errno
, "Failed to change to specified working directory %s: %m", arg_chdir
);
3078 if (arg_start_mode
== START_PID2
) {
3079 r
= stub_pid1(arg_uuid
);
3084 log_debug("Inner child completed, invoking payload.");
3086 /* Now, explicitly close the log, so that we then can close all remaining fds. Closing the log explicitly first
3087 * has the benefit that the logging subsystem knows about it, and is thus ready to be reopened should we need
3088 * it again. Note that the other fds closed here are at least the locking and barrier fds. */
3090 log_set_open_when_needed(true);
3092 (void) fdset_close_others(fds
);
3094 if (arg_start_mode
== START_BOOT
) {
3098 /* Automatically search for the init system */
3100 m
= strv_length(arg_parameters
);
3101 a
= newa(char*, m
+ 2);
3102 memcpy_safe(a
+ 1, arg_parameters
, m
* sizeof(char*));
3105 a
[0] = (char*) "/usr/lib/systemd/systemd";
3106 execve(a
[0], a
, env_use
);
3108 a
[0] = (char*) "/lib/systemd/systemd";
3109 execve(a
[0], a
, env_use
);
3111 a
[0] = (char*) "/sbin/init";
3112 execve(a
[0], a
, env_use
);
3114 exec_target
= "/usr/lib/systemd/systemd, /lib/systemd/systemd, /sbin/init";
3115 } else if (!strv_isempty(arg_parameters
)) {
3116 const char *dollar_path
;
3118 exec_target
= arg_parameters
[0];
3120 /* Use the user supplied search $PATH if there is one, or DEFAULT_PATH_COMPAT if not to search the
3122 dollar_path
= strv_env_get(env_use
, "PATH");
3124 if (putenv((char*) dollar_path
) != 0)
3125 return log_error_errno(errno
, "Failed to update $PATH: %m");
3128 execvpe(arg_parameters
[0], arg_parameters
, env_use
);
3131 /* If we cannot change the directory, we'll end up in /, that is expected. */
3132 (void) chdir(home
?: "/root");
3134 execle("/bin/bash", "-bash", NULL
, env_use
);
3135 execle("/bin/sh", "-sh", NULL
, env_use
);
3137 exec_target
= "/bin/bash, /bin/sh";
3140 return log_error_errno(errno
, "execv(%s) failed: %m", exec_target
);
3143 static int setup_sd_notify_child(void) {
3144 _cleanup_close_
int fd
= -1;
3145 union sockaddr_union sa
= {
3146 .un
.sun_family
= AF_UNIX
,
3147 .un
.sun_path
= NSPAWN_NOTIFY_SOCKET_PATH
,
3151 fd
= socket(AF_UNIX
, SOCK_DGRAM
|SOCK_CLOEXEC
|SOCK_NONBLOCK
, 0);
3153 return log_error_errno(errno
, "Failed to allocate notification socket: %m");
3155 (void) mkdir_parents(NSPAWN_NOTIFY_SOCKET_PATH
, 0755);
3156 (void) sockaddr_un_unlink(&sa
.un
);
3158 r
= bind(fd
, &sa
.sa
, SOCKADDR_UN_LEN(sa
.un
));
3160 return log_error_errno(errno
, "bind(" NSPAWN_NOTIFY_SOCKET_PATH
") failed: %m");
3162 r
= userns_lchown(NSPAWN_NOTIFY_SOCKET_PATH
, 0, 0);
3164 return log_error_errno(r
, "Failed to chown " NSPAWN_NOTIFY_SOCKET_PATH
": %m");
3166 r
= setsockopt_int(fd
, SOL_SOCKET
, SO_PASSCRED
, true);
3168 return log_error_errno(r
, "SO_PASSCRED failed: %m");
3173 static int outer_child(
3175 const char *directory
,
3176 DissectedImage
*dissected_image
,
3183 int uid_shift_socket
,
3184 int master_pty_socket
,
3185 int unified_cgroup_hierarchy_socket
,
3189 _cleanup_close_
int fd
= -1;
3194 /* This is the "outer" child process, i.e the one forked off by the container manager itself. It already has
3195 * its own CLONE_NEWNS namespace (which was created by the clone()). It still lives in the host's CLONE_NEWPID,
3196 * CLONE_NEWUTS, CLONE_NEWIPC, CLONE_NEWUSER and CLONE_NEWNET namespaces. After it completed a number of
3197 * initializations a second child (the "inner" one) is forked off it, and it exits. */
3201 assert(pid_socket
>= 0);
3202 assert(uuid_socket
>= 0);
3203 assert(notify_socket
>= 0);
3204 assert(master_pty_socket
>= 0);
3205 assert(kmsg_socket
>= 0);
3207 log_debug("Outer child is initializing.");
3209 if (prctl(PR_SET_PDEATHSIG
, SIGKILL
) < 0)
3210 return log_error_errno(errno
, "PR_SET_PDEATHSIG failed: %m");
3212 r
= reset_audit_loginuid();
3216 /* Mark everything as slave, so that we still
3217 * receive mounts from the real root, but don't
3218 * propagate mounts to the real root. */
3219 r
= mount_verbose(LOG_ERR
, NULL
, "/", NULL
, MS_SLAVE
|MS_REC
, NULL
);
3223 if (dissected_image
) {
3224 /* If we are operating on a disk image, then mount its root directory now, but leave out the rest. We
3225 * can read the UID shift from it if we need to. Further down we'll mount the rest, but then with the
3226 * uid shift known. That way we can mount VFAT file systems shifted to the right place right away. This
3227 * makes sure ESP partitions and userns are compatible. */
3229 r
= dissected_image_mount(dissected_image
, directory
, arg_uid_shift
,
3230 DISSECT_IMAGE_MOUNT_ROOT_ONLY
|DISSECT_IMAGE_DISCARD_ON_LOOP
|
3231 (arg_read_only
? DISSECT_IMAGE_READ_ONLY
: 0)|
3232 (arg_start_mode
== START_BOOT
? DISSECT_IMAGE_VALIDATE_OS
: 0));
3237 r
= determine_uid_shift(directory
);
3241 if (arg_userns_mode
!= USER_NAMESPACE_NO
) {
3242 /* Let the parent know which UID shift we read from the image */
3243 l
= send(uid_shift_socket
, &arg_uid_shift
, sizeof(arg_uid_shift
), MSG_NOSIGNAL
);
3245 return log_error_errno(errno
, "Failed to send UID shift: %m");
3246 if (l
!= sizeof(arg_uid_shift
))
3247 return log_error_errno(SYNTHETIC_ERRNO(EIO
),
3248 "Short write while sending UID shift.");
3250 if (arg_userns_mode
== USER_NAMESPACE_PICK
) {
3251 /* When we are supposed to pick the UID shift, the parent will check now whether the UID shift
3252 * we just read from the image is available. If yes, it will send the UID shift back to us, if
3253 * not it will pick a different one, and send it back to us. */
3255 l
= recv(uid_shift_socket
, &arg_uid_shift
, sizeof(arg_uid_shift
), 0);
3257 return log_error_errno(errno
, "Failed to recv UID shift: %m");
3258 if (l
!= sizeof(arg_uid_shift
))
3259 return log_error_errno(SYNTHETIC_ERRNO(EIO
),
3260 "Short read while receiving UID shift.");
3263 log_full(arg_quiet
? LOG_DEBUG
: LOG_INFO
,
3264 "Selected user namespace base " UID_FMT
" and range " UID_FMT
".", arg_uid_shift
, arg_uid_range
);
3267 if (!dissected_image
) {
3268 /* Turn directory into bind mount */
3269 r
= mount_verbose(LOG_ERR
, directory
, directory
, NULL
, MS_BIND
|MS_REC
, NULL
);
3274 r
= setup_pivot_root(
3277 arg_pivot_root_old
);
3281 r
= setup_volatile_mode(
3284 arg_userns_mode
!= USER_NAMESPACE_NO
,
3287 arg_selinux_apifs_context
);
3291 if (dissected_image
) {
3292 /* Now we know the uid shift, let's now mount everything else that might be in the image. */
3293 r
= dissected_image_mount(dissected_image
, directory
, arg_uid_shift
,
3294 DISSECT_IMAGE_MOUNT_NON_ROOT_ONLY
|DISSECT_IMAGE_DISCARD_ON_LOOP
|(arg_read_only
? DISSECT_IMAGE_READ_ONLY
: 0));
3299 if (arg_unified_cgroup_hierarchy
== CGROUP_UNIFIED_UNKNOWN
) {
3300 /* OK, we don't know yet which cgroup mode to use yet. Let's figure it out, and tell the parent. */
3302 r
= detect_unified_cgroup_hierarchy_from_image(directory
);
3306 l
= send(unified_cgroup_hierarchy_socket
, &arg_unified_cgroup_hierarchy
, sizeof(arg_unified_cgroup_hierarchy
), MSG_NOSIGNAL
);
3308 return log_error_errno(errno
, "Failed to send cgroup mode: %m");
3309 if (l
!= sizeof(arg_unified_cgroup_hierarchy
))
3310 return log_error_errno(SYNTHETIC_ERRNO(EIO
),
3311 "Short write while sending cgroup mode.");
3313 unified_cgroup_hierarchy_socket
= safe_close(unified_cgroup_hierarchy_socket
);
3316 /* Mark everything as shared so our mounts get propagated down. This is
3317 * required to make new bind mounts available in systemd services
3318 * inside the container that create a new mount namespace.
3319 * See https://github.com/systemd/systemd/issues/3860
3320 * Further submounts (such as /dev) done after this will inherit the
3321 * shared propagation mode. */
3322 r
= mount_verbose(LOG_ERR
, NULL
, directory
, NULL
, MS_SHARED
|MS_REC
, NULL
);
3326 r
= recursive_chown(directory
, arg_uid_shift
, arg_uid_range
);
3330 r
= base_filesystem_create(directory
, arg_uid_shift
, (gid_t
) arg_uid_shift
);
3334 if (arg_read_only
&& arg_volatile_mode
== VOLATILE_NO
) {
3335 r
= bind_remount_recursive(directory
, MS_RDONLY
, MS_RDONLY
, NULL
);
3337 return log_error_errno(r
, "Failed to make tree read-only: %m");
3340 r
= mount_all(directory
,
3343 arg_selinux_apifs_context
);
3347 r
= copy_devnodes(directory
);
3351 r
= make_extra_nodes(directory
);
3355 (void) dev_setup(directory
, arg_uid_shift
, arg_uid_shift
);
3356 (void) make_inaccessible_nodes(directory
, arg_uid_shift
, arg_uid_shift
);
3358 r
= setup_pts(directory
);
3362 r
= setup_propagate(directory
);
3366 r
= setup_keyring();
3370 r
= setup_timezone(directory
);
3374 r
= setup_resolv_conf(directory
);
3378 r
= setup_machine_id(directory
);
3382 r
= setup_journal(directory
);
3389 arg_n_custom_mounts
,
3390 arg_userns_mode
!= USER_NAMESPACE_NO
,
3393 arg_selinux_apifs_context
,
3398 if (!arg_use_cgns
) {
3401 arg_unified_cgroup_hierarchy
,
3402 arg_userns_mode
!= USER_NAMESPACE_NO
,
3405 arg_selinux_apifs_context
,
3411 r
= mount_move_root(directory
);
3413 return log_error_errno(r
, "Failed to move root directory: %m");
3415 fd
= setup_sd_notify_child();
3419 pid
= raw_clone(SIGCHLD
|CLONE_NEWNS
|
3420 arg_clone_ns_flags
|
3421 (arg_userns_mode
!= USER_NAMESPACE_NO
? CLONE_NEWUSER
: 0));
3423 return log_error_errno(errno
, "Failed to fork inner child: %m");
3425 pid_socket
= safe_close(pid_socket
);
3426 uuid_socket
= safe_close(uuid_socket
);
3427 notify_socket
= safe_close(notify_socket
);
3428 uid_shift_socket
= safe_close(uid_shift_socket
);
3430 /* The inner child has all namespaces that are
3431 * requested, so that we all are owned by the user if
3432 * user namespaces are turned on. */
3434 if (arg_network_namespace_path
) {
3435 r
= namespace_enter(-1, -1, netns_fd
, -1, -1);
3437 return log_error_errno(r
, "Failed to join network namespace: %m");
3440 r
= inner_child(barrier
, directory
, secondary
, kmsg_socket
, rtnl_socket
, master_pty_socket
, fds
);
3442 _exit(EXIT_FAILURE
);
3444 _exit(EXIT_SUCCESS
);
3447 l
= send(pid_socket
, &pid
, sizeof(pid
), MSG_NOSIGNAL
);
3449 return log_error_errno(errno
, "Failed to send PID: %m");
3450 if (l
!= sizeof(pid
))
3451 return log_error_errno(SYNTHETIC_ERRNO(EIO
),
3452 "Short write while sending PID.");
3454 l
= send(uuid_socket
, &arg_uuid
, sizeof(arg_uuid
), MSG_NOSIGNAL
);
3456 return log_error_errno(errno
, "Failed to send machine ID: %m");
3457 if (l
!= sizeof(arg_uuid
))
3458 return log_error_errno(SYNTHETIC_ERRNO(EIO
),
3459 "Short write while sending machine ID.");
3461 l
= send_one_fd(notify_socket
, fd
, 0);
3463 return log_error_errno(l
, "Failed to send notify fd: %m");
3465 pid_socket
= safe_close(pid_socket
);
3466 uuid_socket
= safe_close(uuid_socket
);
3467 notify_socket
= safe_close(notify_socket
);
3468 master_pty_socket
= safe_close(master_pty_socket
);
3469 kmsg_socket
= safe_close(kmsg_socket
);
3470 rtnl_socket
= safe_close(rtnl_socket
);
3471 netns_fd
= safe_close(netns_fd
);
3476 static int uid_shift_pick(uid_t
*shift
, LockFile
*ret_lock_file
) {
3477 bool tried_hashed
= false;
3478 unsigned n_tries
= 100;
3483 assert(ret_lock_file
);
3484 assert(arg_userns_mode
== USER_NAMESPACE_PICK
);
3485 assert(arg_uid_range
== 0x10000U
);
3489 (void) mkdir("/run/systemd/nspawn-uid", 0755);
3492 char lock_path
[STRLEN("/run/systemd/nspawn-uid/") + DECIMAL_STR_MAX(uid_t
) + 1];
3493 _cleanup_(release_lock_file
) LockFile lf
= LOCK_FILE_INIT
;
3498 if (candidate
< CONTAINER_UID_BASE_MIN
|| candidate
> CONTAINER_UID_BASE_MAX
)
3500 if ((candidate
& UINT32_C(0xFFFF)) != 0)
3503 xsprintf(lock_path
, "/run/systemd/nspawn-uid/" UID_FMT
, candidate
);
3504 r
= make_lock_file(lock_path
, LOCK_EX
|LOCK_NB
, &lf
);
3505 if (r
== -EBUSY
) /* Range already taken by another nspawn instance */
3510 /* Make some superficial checks whether the range is currently known in the user database */
3511 if (getpwuid(candidate
))
3513 if (getpwuid(candidate
+ UINT32_C(0xFFFE)))
3515 if (getgrgid(candidate
))
3517 if (getgrgid(candidate
+ UINT32_C(0xFFFE)))
3520 *ret_lock_file
= lf
;
3521 lf
= (struct LockFile
) LOCK_FILE_INIT
;
3526 if (arg_machine
&& !tried_hashed
) {
3527 /* Try to hash the base from the container name */
3529 static const uint8_t hash_key
[] = {
3530 0xe1, 0x56, 0xe0, 0xf0, 0x4a, 0xf0, 0x41, 0xaf,
3531 0x96, 0x41, 0xcf, 0x41, 0x33, 0x94, 0xff, 0x72
3534 candidate
= (uid_t
) siphash24(arg_machine
, strlen(arg_machine
), hash_key
);
3536 tried_hashed
= true;
3538 random_bytes(&candidate
, sizeof(candidate
));
3540 candidate
= (candidate
% (CONTAINER_UID_BASE_MAX
- CONTAINER_UID_BASE_MIN
)) + CONTAINER_UID_BASE_MIN
;
3541 candidate
&= (uid_t
) UINT32_C(0xFFFF0000);
3545 static int setup_uid_map(pid_t pid
) {
3546 char uid_map
[STRLEN("/proc//uid_map") + DECIMAL_STR_MAX(uid_t
) + 1], line
[DECIMAL_STR_MAX(uid_t
)*3+3+1];
3551 xsprintf(uid_map
, "/proc/" PID_FMT
"/uid_map", pid
);
3552 xsprintf(line
, UID_FMT
" " UID_FMT
" " UID_FMT
"\n", 0, arg_uid_shift
, arg_uid_range
);
3553 r
= write_string_file(uid_map
, line
, WRITE_STRING_FILE_DISABLE_BUFFER
);
3555 return log_error_errno(r
, "Failed to write UID map: %m");
3557 /* We always assign the same UID and GID ranges */
3558 xsprintf(uid_map
, "/proc/" PID_FMT
"/gid_map", pid
);
3559 r
= write_string_file(uid_map
, line
, WRITE_STRING_FILE_DISABLE_BUFFER
);
3561 return log_error_errno(r
, "Failed to write GID map: %m");
3566 static int nspawn_dispatch_notify_fd(sd_event_source
*source
, int fd
, uint32_t revents
, void *userdata
) {
3567 char buf
[NOTIFY_BUFFER_MAX
+1];
3569 struct iovec iovec
= {
3571 .iov_len
= sizeof(buf
)-1,
3574 struct cmsghdr cmsghdr
;
3575 uint8_t buf
[CMSG_SPACE(sizeof(struct ucred
)) +
3576 CMSG_SPACE(sizeof(int) * NOTIFY_FD_MAX
)];
3578 struct msghdr msghdr
= {
3581 .msg_control
= &control
,
3582 .msg_controllen
= sizeof(control
),
3584 struct cmsghdr
*cmsg
;
3585 struct ucred
*ucred
= NULL
;
3587 pid_t inner_child_pid
;
3588 _cleanup_strv_free_
char **tags
= NULL
;
3592 inner_child_pid
= PTR_TO_PID(userdata
);
3594 if (revents
!= EPOLLIN
) {
3595 log_warning("Got unexpected poll event for notify fd.");
3599 n
= recvmsg(fd
, &msghdr
, MSG_DONTWAIT
|MSG_CMSG_CLOEXEC
);
3601 if (IN_SET(errno
, EAGAIN
, EINTR
))
3604 return log_warning_errno(errno
, "Couldn't read notification socket: %m");
3606 cmsg_close_all(&msghdr
);
3608 CMSG_FOREACH(cmsg
, &msghdr
) {
3609 if (cmsg
->cmsg_level
== SOL_SOCKET
&&
3610 cmsg
->cmsg_type
== SCM_CREDENTIALS
&&
3611 cmsg
->cmsg_len
== CMSG_LEN(sizeof(struct ucred
))) {
3613 ucred
= (struct ucred
*) CMSG_DATA(cmsg
);
3617 if (!ucred
|| ucred
->pid
!= inner_child_pid
) {
3618 log_debug("Received notify message without valid credentials. Ignoring.");
3622 if ((size_t) n
>= sizeof(buf
)) {
3623 log_warning("Received notify message exceeded maximum size. Ignoring.");
3628 tags
= strv_split(buf
, "\n\r");
3632 if (strv_find(tags
, "READY=1"))
3633 (void) sd_notifyf(false, "READY=1\n");
3635 p
= strv_find_startswith(tags
, "STATUS=");
3637 (void) sd_notifyf(false, "STATUS=Container running: %s", p
);
3642 static int setup_sd_notify_parent(sd_event
*event
, int fd
, pid_t
*inner_child_pid
, sd_event_source
**notify_event_source
) {
3645 r
= sd_event_add_io(event
, notify_event_source
, fd
, EPOLLIN
, nspawn_dispatch_notify_fd
, inner_child_pid
);
3647 return log_error_errno(r
, "Failed to allocate notify event source: %m");
3649 (void) sd_event_source_set_description(*notify_event_source
, "nspawn-notify");
3654 static int merge_settings(Settings
*settings
, const char *path
) {
3660 /* Copy over bits from the settings, unless they have been explicitly masked by command line switches. Note
3661 * that this steals the fields of the Settings* structure, and hence modifies it. */
3663 if ((arg_settings_mask
& SETTING_START_MODE
) == 0 &&
3664 settings
->start_mode
>= 0) {
3665 arg_start_mode
= settings
->start_mode
;
3666 strv_free_and_replace(arg_parameters
, settings
->parameters
);
3669 if ((arg_settings_mask
& SETTING_EPHEMERAL
) == 0)
3670 arg_ephemeral
= settings
->ephemeral
;
3672 if ((arg_settings_mask
& SETTING_DIRECTORY
) == 0 &&
3675 if (!arg_settings_trusted
)
3676 log_warning("Ignoring root directory setting, file %s is not trusted.", path
);
3678 free_and_replace(arg_directory
, settings
->root
);
3681 if ((arg_settings_mask
& SETTING_PIVOT_ROOT
) == 0 &&
3682 settings
->pivot_root_new
) {
3683 free_and_replace(arg_pivot_root_new
, settings
->pivot_root_new
);
3684 free_and_replace(arg_pivot_root_old
, settings
->pivot_root_old
);
3687 if ((arg_settings_mask
& SETTING_WORKING_DIRECTORY
) == 0 &&
3688 settings
->working_directory
)
3689 free_and_replace(arg_chdir
, settings
->working_directory
);
3691 if ((arg_settings_mask
& SETTING_ENVIRONMENT
) == 0 &&
3692 settings
->environment
)
3693 strv_free_and_replace(arg_setenv
, settings
->environment
);
3695 if ((arg_settings_mask
& SETTING_USER
) == 0) {
3698 free_and_replace(arg_user
, settings
->user
);
3700 if (uid_is_valid(settings
->uid
))
3701 arg_uid
= settings
->uid
;
3702 if (gid_is_valid(settings
->gid
))
3703 arg_gid
= settings
->gid
;
3704 if (settings
->n_supplementary_gids
> 0) {
3705 free_and_replace(arg_supplementary_gids
, settings
->supplementary_gids
);
3706 arg_n_supplementary_gids
= settings
->n_supplementary_gids
;
3710 if ((arg_settings_mask
& SETTING_CAPABILITY
) == 0) {
3711 uint64_t plus
, minus
;
3713 /* Note that we copy both the simple plus/minus caps here, and the full quintet from the
3714 * Settings structure */
3716 plus
= settings
->capability
;
3717 minus
= settings
->drop_capability
;
3719 if ((arg_settings_mask
& SETTING_NETWORK
) == 0) {
3720 if (settings_private_network(settings
))
3721 plus
|= UINT64_C(1) << CAP_NET_ADMIN
;
3723 minus
|= UINT64_C(1) << CAP_NET_ADMIN
;
3726 if (!arg_settings_trusted
&& plus
!= 0) {
3727 if (settings
->capability
!= 0)
3728 log_warning("Ignoring Capability= setting, file %s is not trusted.", path
);
3730 arg_caps_retain
|= plus
;
3732 arg_caps_retain
&= ~minus
;
3734 /* Copy the full capabilities over too */
3735 if (capability_quintet_is_set(&settings
->full_capabilities
)) {
3736 if (!arg_settings_trusted
)
3737 log_warning("Ignoring capability settings, file %s is not trusted.", path
);
3739 arg_full_capabilities
= settings
->full_capabilities
;
3743 if ((arg_settings_mask
& SETTING_KILL_SIGNAL
) == 0 &&
3744 settings
->kill_signal
> 0)
3745 arg_kill_signal
= settings
->kill_signal
;
3747 if ((arg_settings_mask
& SETTING_PERSONALITY
) == 0 &&
3748 settings
->personality
!= PERSONALITY_INVALID
)
3749 arg_personality
= settings
->personality
;
3751 if ((arg_settings_mask
& SETTING_MACHINE_ID
) == 0 &&
3752 !sd_id128_is_null(settings
->machine_id
)) {
3754 if (!arg_settings_trusted
)
3755 log_warning("Ignoring MachineID= setting, file %s is not trusted.", path
);
3757 arg_uuid
= settings
->machine_id
;
3760 if ((arg_settings_mask
& SETTING_READ_ONLY
) == 0 &&
3761 settings
->read_only
>= 0)
3762 arg_read_only
= settings
->read_only
;
3764 if ((arg_settings_mask
& SETTING_VOLATILE_MODE
) == 0 &&
3765 settings
->volatile_mode
!= _VOLATILE_MODE_INVALID
)
3766 arg_volatile_mode
= settings
->volatile_mode
;
3768 if ((arg_settings_mask
& SETTING_CUSTOM_MOUNTS
) == 0 &&
3769 settings
->n_custom_mounts
> 0) {
3771 if (!arg_settings_trusted
)
3772 log_warning("Ignoring TemporaryFileSystem=, Bind= and BindReadOnly= settings, file %s is not trusted.", path
);
3774 custom_mount_free_all(arg_custom_mounts
, arg_n_custom_mounts
);
3775 arg_custom_mounts
= TAKE_PTR(settings
->custom_mounts
);
3776 arg_n_custom_mounts
= settings
->n_custom_mounts
;
3777 settings
->n_custom_mounts
= 0;
3781 if ((arg_settings_mask
& SETTING_NETWORK
) == 0 &&
3782 (settings
->private_network
>= 0 ||
3783 settings
->network_veth
>= 0 ||
3784 settings
->network_bridge
||
3785 settings
->network_zone
||
3786 settings
->network_interfaces
||
3787 settings
->network_macvlan
||
3788 settings
->network_ipvlan
||
3789 settings
->network_veth_extra
||
3790 settings
->network_namespace_path
)) {
3792 if (!arg_settings_trusted
)
3793 log_warning("Ignoring network settings, file %s is not trusted.", path
);
3795 arg_network_veth
= settings_network_veth(settings
);
3796 arg_private_network
= settings_private_network(settings
);
3798 strv_free_and_replace(arg_network_interfaces
, settings
->network_interfaces
);
3799 strv_free_and_replace(arg_network_macvlan
, settings
->network_macvlan
);
3800 strv_free_and_replace(arg_network_ipvlan
, settings
->network_ipvlan
);
3801 strv_free_and_replace(arg_network_veth_extra
, settings
->network_veth_extra
);
3803 free_and_replace(arg_network_bridge
, settings
->network_bridge
);
3804 free_and_replace(arg_network_zone
, settings
->network_zone
);
3806 free_and_replace(arg_network_namespace_path
, settings
->network_namespace_path
);
3810 if ((arg_settings_mask
& SETTING_EXPOSE_PORTS
) == 0 &&
3811 settings
->expose_ports
) {
3813 if (!arg_settings_trusted
)
3814 log_warning("Ignoring Port= setting, file %s is not trusted.", path
);
3816 expose_port_free_all(arg_expose_ports
);
3817 arg_expose_ports
= TAKE_PTR(settings
->expose_ports
);
3821 if ((arg_settings_mask
& SETTING_USERNS
) == 0 &&
3822 settings
->userns_mode
!= _USER_NAMESPACE_MODE_INVALID
) {
3824 if (!arg_settings_trusted
)
3825 log_warning("Ignoring PrivateUsers= and PrivateUsersChown= settings, file %s is not trusted.", path
);
3827 arg_userns_mode
= settings
->userns_mode
;
3828 arg_uid_shift
= settings
->uid_shift
;
3829 arg_uid_range
= settings
->uid_range
;
3830 arg_userns_chown
= settings
->userns_chown
;
3834 if ((arg_settings_mask
& SETTING_NOTIFY_READY
) == 0)
3835 arg_notify_ready
= settings
->notify_ready
;
3837 if ((arg_settings_mask
& SETTING_SYSCALL_FILTER
) == 0) {
3839 if (!arg_settings_trusted
&& !strv_isempty(settings
->syscall_whitelist
))
3840 log_warning("Ignoring SystemCallFilter= settings, file %s is not trusted.", path
);
3842 strv_free_and_replace(arg_syscall_whitelist
, settings
->syscall_whitelist
);
3843 strv_free_and_replace(arg_syscall_blacklist
, settings
->syscall_blacklist
);
3847 if (!arg_settings_trusted
&& settings
->seccomp
)
3848 log_warning("Ignoring SECCOMP filter, file %s is not trusted.", path
);
3850 seccomp_release(arg_seccomp
);
3851 arg_seccomp
= TAKE_PTR(settings
->seccomp
);
3856 for (rl
= 0; rl
< _RLIMIT_MAX
; rl
++) {
3857 if ((arg_settings_mask
& (SETTING_RLIMIT_FIRST
<< rl
)))
3860 if (!settings
->rlimit
[rl
])
3863 if (!arg_settings_trusted
) {
3864 log_warning("Ignoring Limit%s= setting, file '%s' is not trusted.", rlimit_to_string(rl
), path
);
3868 free_and_replace(arg_rlimit
[rl
], settings
->rlimit
[rl
]);
3871 if ((arg_settings_mask
& SETTING_HOSTNAME
) == 0 &&
3873 free_and_replace(arg_hostname
, settings
->hostname
);
3875 if ((arg_settings_mask
& SETTING_NO_NEW_PRIVILEGES
) == 0 &&
3876 settings
->no_new_privileges
>= 0)
3877 arg_no_new_privileges
= settings
->no_new_privileges
;
3879 if ((arg_settings_mask
& SETTING_OOM_SCORE_ADJUST
) == 0 &&
3880 settings
->oom_score_adjust_set
) {
3882 if (!arg_settings_trusted
)
3883 log_warning("Ignoring OOMScoreAdjust= setting, file '%s' is not trusted.", path
);
3885 arg_oom_score_adjust
= settings
->oom_score_adjust
;
3886 arg_oom_score_adjust_set
= true;
3890 if ((arg_settings_mask
& SETTING_CPU_AFFINITY
) == 0 &&
3891 settings
->cpu_set
.set
) {
3893 if (!arg_settings_trusted
)
3894 log_warning("Ignoring CPUAffinity= setting, file '%s' is not trusted.", path
);
3896 cpu_set_reset(&arg_cpu_set
);
3897 arg_cpu_set
= settings
->cpu_set
;
3898 settings
->cpu_set
= (CPUSet
) {};
3902 if ((arg_settings_mask
& SETTING_RESOLV_CONF
) == 0 &&
3903 settings
->resolv_conf
!= _RESOLV_CONF_MODE_INVALID
)
3904 arg_resolv_conf
= settings
->resolv_conf
;
3906 if ((arg_settings_mask
& SETTING_LINK_JOURNAL
) == 0 &&
3907 settings
->link_journal
!= _LINK_JOURNAL_INVALID
) {
3909 if (!arg_settings_trusted
)
3910 log_warning("Ignoring journal link setting, file '%s' is not trusted.", path
);
3912 arg_link_journal
= settings
->link_journal
;
3913 arg_link_journal_try
= settings
->link_journal_try
;
3917 if ((arg_settings_mask
& SETTING_TIMEZONE
) == 0 &&
3918 settings
->timezone
!= _TIMEZONE_MODE_INVALID
)
3919 arg_timezone
= settings
->timezone
;
3921 if ((arg_settings_mask
& SETTING_SLICE
) == 0 &&
3924 if (!arg_settings_trusted
)
3925 log_warning("Ignoring slice setting, file '%s' is not trusted.", path
);
3927 free_and_replace(arg_slice
, settings
->slice
);
3930 if ((arg_settings_mask
& SETTING_USE_CGNS
) == 0 &&
3931 settings
->use_cgns
>= 0) {
3933 if (!arg_settings_trusted
)
3934 log_warning("Ignoring cgroup namespace setting, file '%s' is not trusted.", path
);
3936 arg_use_cgns
= settings
->use_cgns
;
3939 if ((arg_settings_mask
& SETTING_CLONE_NS_FLAGS
) == 0 &&
3940 settings
->clone_ns_flags
!= (unsigned long) -1) {
3942 if (!arg_settings_trusted
)
3943 log_warning("Ignoring namespace setting, file '%s' is not trusted.", path
);
3945 arg_clone_ns_flags
= settings
->clone_ns_flags
;
3948 if ((arg_settings_mask
& SETTING_CONSOLE_MODE
) == 0 &&
3949 settings
->console_mode
>= 0) {
3951 if (!arg_settings_trusted
)
3952 log_warning("Ignoring console mode setting, file '%s' is not trusted.", path
);
3954 arg_console_mode
= settings
->console_mode
;
3957 /* The following properties can only be set through the OCI settings logic, not from the command line, hence we
3958 * don't consult arg_settings_mask for them. */
3960 sd_bus_message_unref(arg_property_message
);
3961 arg_property_message
= TAKE_PTR(settings
->properties
);
3963 arg_console_width
= settings
->console_width
;
3964 arg_console_height
= settings
->console_height
;
3966 device_node_array_free(arg_extra_nodes
, arg_n_extra_nodes
);
3967 arg_extra_nodes
= TAKE_PTR(settings
->extra_nodes
);
3968 arg_n_extra_nodes
= settings
->n_extra_nodes
;
3973 static int load_settings(void) {
3974 _cleanup_(settings_freep
) Settings
*settings
= NULL
;
3975 _cleanup_fclose_
FILE *f
= NULL
;
3976 _cleanup_free_
char *p
= NULL
;
3983 /* If all settings are masked, there's no point in looking for
3984 * the settings file */
3985 if ((arg_settings_mask
& _SETTINGS_MASK_ALL
) == _SETTINGS_MASK_ALL
)
3988 fn
= strjoina(arg_machine
, ".nspawn");
3990 /* We first look in the admin's directories in /etc and /run */
3991 FOREACH_STRING(i
, "/etc/systemd/nspawn", "/run/systemd/nspawn") {
3992 _cleanup_free_
char *j
= NULL
;
3994 j
= path_join(i
, fn
);
4002 /* By default, we trust configuration from /etc and /run */
4003 if (arg_settings_trusted
< 0)
4004 arg_settings_trusted
= true;
4009 if (errno
!= ENOENT
)
4010 return log_error_errno(errno
, "Failed to open %s: %m", j
);
4014 /* After that, let's look for a file next to the
4015 * actual image we shall boot. */
4018 p
= file_in_same_dir(arg_image
, fn
);
4021 } else if (arg_directory
) {
4022 p
= file_in_same_dir(arg_directory
, fn
);
4029 if (!f
&& errno
!= ENOENT
)
4030 return log_error_errno(errno
, "Failed to open %s: %m", p
);
4032 /* By default, we do not trust configuration from /var/lib/machines */
4033 if (arg_settings_trusted
< 0)
4034 arg_settings_trusted
= false;
4041 log_debug("Settings are trusted: %s", yes_no(arg_settings_trusted
));
4043 r
= settings_load(f
, p
, &settings
);
4047 return merge_settings(settings
, p
);
4050 static int load_oci_bundle(void) {
4051 _cleanup_(settings_freep
) Settings
*settings
= NULL
;
4054 if (!arg_oci_bundle
)
4057 /* By default let's trust OCI bundles */
4058 if (arg_settings_trusted
< 0)
4059 arg_settings_trusted
= true;
4061 r
= oci_load(NULL
, arg_oci_bundle
, &settings
);
4065 return merge_settings(settings
, arg_oci_bundle
);
4068 static int run_container(
4069 DissectedImage
*dissected_image
,
4072 char veth_name
[IFNAMSIZ
], bool *veth_created
,
4073 union in_addr_union
*exposed
,
4074 int *master
, pid_t
*pid
, int *ret
) {
4076 static const struct sigaction sa
= {
4077 .sa_handler
= nop_signal_handler
,
4078 .sa_flags
= SA_NOCLDSTOP
|SA_RESTART
,
4081 _cleanup_(release_lock_file
) LockFile uid_shift_lock
= LOCK_FILE_INIT
;
4082 _cleanup_close_
int etc_passwd_lock
= -1;
4083 _cleanup_close_pair_
int
4084 kmsg_socket_pair
[2] = { -1, -1 },
4085 rtnl_socket_pair
[2] = { -1, -1 },
4086 pid_socket_pair
[2] = { -1, -1 },
4087 uuid_socket_pair
[2] = { -1, -1 },
4088 notify_socket_pair
[2] = { -1, -1 },
4089 uid_shift_socket_pair
[2] = { -1, -1 },
4090 master_pty_socket_pair
[2] = { -1, -1 },
4091 unified_cgroup_hierarchy_socket_pair
[2] = { -1, -1};
4093 _cleanup_close_
int notify_socket
= -1;
4094 _cleanup_(barrier_destroy
) Barrier barrier
= BARRIER_NULL
;
4095 _cleanup_(sd_event_source_unrefp
) sd_event_source
*notify_event_source
= NULL
;
4096 _cleanup_(sd_event_unrefp
) sd_event
*event
= NULL
;
4097 _cleanup_(pty_forward_freep
) PTYForward
*forward
= NULL
;
4098 _cleanup_(sd_netlink_unrefp
) sd_netlink
*rtnl
= NULL
;
4099 _cleanup_(sd_bus_flush_close_unrefp
) sd_bus
*bus
= NULL
;
4100 ContainerStatus container_status
= 0;
4104 _cleanup_close_
int netns_fd
= -1;
4106 assert_se(sigemptyset(&mask_chld
) == 0);
4107 assert_se(sigaddset(&mask_chld
, SIGCHLD
) == 0);
4109 if (arg_userns_mode
== USER_NAMESPACE_PICK
) {
4110 /* When we shall pick the UID/GID range, let's first lock /etc/passwd, so that we can safely
4111 * check with getpwuid() if the specific user already exists. Note that /etc might be
4112 * read-only, in which case this will fail with EROFS. But that's really OK, as in that case we
4113 * can be reasonably sure that no users are going to be added. Note that getpwuid() checks are
4114 * really just an extra safety net. We kinda assume that the UID range we allocate from is
4117 etc_passwd_lock
= take_etc_passwd_lock(NULL
);
4118 if (etc_passwd_lock
< 0 && etc_passwd_lock
!= -EROFS
)
4119 return log_error_errno(etc_passwd_lock
, "Failed to take /etc/passwd lock: %m");
4122 r
= barrier_create(&barrier
);
4124 return log_error_errno(r
, "Cannot initialize IPC barrier: %m");
4126 if (socketpair(AF_UNIX
, SOCK_SEQPACKET
|SOCK_CLOEXEC
, 0, kmsg_socket_pair
) < 0)
4127 return log_error_errno(errno
, "Failed to create kmsg socket pair: %m");
4129 if (socketpair(AF_UNIX
, SOCK_SEQPACKET
|SOCK_CLOEXEC
, 0, rtnl_socket_pair
) < 0)
4130 return log_error_errno(errno
, "Failed to create rtnl socket pair: %m");
4132 if (socketpair(AF_UNIX
, SOCK_SEQPACKET
|SOCK_CLOEXEC
, 0, pid_socket_pair
) < 0)
4133 return log_error_errno(errno
, "Failed to create pid socket pair: %m");
4135 if (socketpair(AF_UNIX
, SOCK_SEQPACKET
|SOCK_CLOEXEC
, 0, uuid_socket_pair
) < 0)
4136 return log_error_errno(errno
, "Failed to create id socket pair: %m");
4138 if (socketpair(AF_UNIX
, SOCK_SEQPACKET
|SOCK_CLOEXEC
, 0, notify_socket_pair
) < 0)
4139 return log_error_errno(errno
, "Failed to create notify socket pair: %m");
4141 if (socketpair(AF_UNIX
, SOCK_SEQPACKET
|SOCK_CLOEXEC
, 0, master_pty_socket_pair
) < 0)
4142 return log_error_errno(errno
, "Failed to create console socket pair: %m");
4144 if (arg_userns_mode
!= USER_NAMESPACE_NO
)
4145 if (socketpair(AF_UNIX
, SOCK_SEQPACKET
|SOCK_CLOEXEC
, 0, uid_shift_socket_pair
) < 0)
4146 return log_error_errno(errno
, "Failed to create uid shift socket pair: %m");
4148 if (arg_unified_cgroup_hierarchy
== CGROUP_UNIFIED_UNKNOWN
)
4149 if (socketpair(AF_UNIX
, SOCK_SEQPACKET
|SOCK_CLOEXEC
, 0, unified_cgroup_hierarchy_socket_pair
) < 0)
4150 return log_error_errno(errno
, "Failed to create unified cgroup socket pair: %m");
4152 /* Child can be killed before execv(), so handle SIGCHLD in order to interrupt
4153 * parent's blocking calls and give it a chance to call wait() and terminate. */
4154 r
= sigprocmask(SIG_UNBLOCK
, &mask_chld
, NULL
);
4156 return log_error_errno(errno
, "Failed to change the signal mask: %m");
4158 r
= sigaction(SIGCHLD
, &sa
, NULL
);
4160 return log_error_errno(errno
, "Failed to install SIGCHLD handler: %m");
4162 if (arg_network_namespace_path
) {
4163 netns_fd
= open(arg_network_namespace_path
, O_RDONLY
|O_NOCTTY
|O_CLOEXEC
);
4165 return log_error_errno(errno
, "Cannot open file %s: %m", arg_network_namespace_path
);
4167 r
= fd_is_network_ns(netns_fd
);
4169 log_debug_errno(r
, "Cannot determine if passed network namespace path '%s' really refers to a network namespace, assuming it does.", arg_network_namespace_path
);
4171 return log_error_errno(r
, "Failed to check %s fs type: %m", arg_network_namespace_path
);
4173 return log_error_errno(SYNTHETIC_ERRNO(EINVAL
),
4174 "Path %s doesn't refer to a network namespace, refusing.", arg_network_namespace_path
);
4177 *pid
= raw_clone(SIGCHLD
|CLONE_NEWNS
);
4179 return log_error_errno(errno
, "clone() failed%s: %m",
4181 ", do you have namespace support enabled in your kernel? (You need UTS, IPC, PID and NET namespacing built in)" : "");
4184 /* The outer child only has a file system namespace. */
4185 barrier_set_role(&barrier
, BARRIER_CHILD
);
4187 kmsg_socket_pair
[0] = safe_close(kmsg_socket_pair
[0]);
4188 rtnl_socket_pair
[0] = safe_close(rtnl_socket_pair
[0]);
4189 pid_socket_pair
[0] = safe_close(pid_socket_pair
[0]);
4190 uuid_socket_pair
[0] = safe_close(uuid_socket_pair
[0]);
4191 notify_socket_pair
[0] = safe_close(notify_socket_pair
[0]);
4192 master_pty_socket_pair
[0] = safe_close(master_pty_socket_pair
[0]);
4193 uid_shift_socket_pair
[0] = safe_close(uid_shift_socket_pair
[0]);
4194 unified_cgroup_hierarchy_socket_pair
[0] = safe_close(unified_cgroup_hierarchy_socket_pair
[0]);
4196 (void) reset_all_signal_handlers();
4197 (void) reset_signal_mask();
4199 r
= outer_child(&barrier
,
4204 uuid_socket_pair
[1],
4205 notify_socket_pair
[1],
4206 kmsg_socket_pair
[1],
4207 rtnl_socket_pair
[1],
4208 uid_shift_socket_pair
[1],
4209 master_pty_socket_pair
[1],
4210 unified_cgroup_hierarchy_socket_pair
[1],
4214 _exit(EXIT_FAILURE
);
4216 _exit(EXIT_SUCCESS
);
4219 barrier_set_role(&barrier
, BARRIER_PARENT
);
4223 kmsg_socket_pair
[1] = safe_close(kmsg_socket_pair
[1]);
4224 rtnl_socket_pair
[1] = safe_close(rtnl_socket_pair
[1]);
4225 pid_socket_pair
[1] = safe_close(pid_socket_pair
[1]);
4226 uuid_socket_pair
[1] = safe_close(uuid_socket_pair
[1]);
4227 notify_socket_pair
[1] = safe_close(notify_socket_pair
[1]);
4228 master_pty_socket_pair
[1] = safe_close(master_pty_socket_pair
[1]);
4229 uid_shift_socket_pair
[1] = safe_close(uid_shift_socket_pair
[1]);
4230 unified_cgroup_hierarchy_socket_pair
[1] = safe_close(unified_cgroup_hierarchy_socket_pair
[1]);
4232 if (arg_userns_mode
!= USER_NAMESPACE_NO
) {
4233 /* The child just let us know the UID shift it might have read from the image. */
4234 l
= recv(uid_shift_socket_pair
[0], &arg_uid_shift
, sizeof arg_uid_shift
, 0);
4236 return log_error_errno(errno
, "Failed to read UID shift: %m");
4237 if (l
!= sizeof arg_uid_shift
)
4238 return log_error_errno(SYNTHETIC_ERRNO(EIO
), "Short read while reading UID shift.");
4240 if (arg_userns_mode
== USER_NAMESPACE_PICK
) {
4241 /* If we are supposed to pick the UID shift, let's try to use the shift read from the
4242 * image, but if that's already in use, pick a new one, and report back to the child,
4243 * which one we now picked. */
4245 r
= uid_shift_pick(&arg_uid_shift
, &uid_shift_lock
);
4247 return log_error_errno(r
, "Failed to pick suitable UID/GID range: %m");
4249 l
= send(uid_shift_socket_pair
[0], &arg_uid_shift
, sizeof arg_uid_shift
, MSG_NOSIGNAL
);
4251 return log_error_errno(errno
, "Failed to send UID shift: %m");
4252 if (l
!= sizeof arg_uid_shift
)
4253 return log_error_errno(SYNTHETIC_ERRNO(EIO
), "Short write while writing UID shift.");
4257 if (arg_unified_cgroup_hierarchy
== CGROUP_UNIFIED_UNKNOWN
) {
4258 /* The child let us know the support cgroup mode it might have read from the image. */
4259 l
= recv(unified_cgroup_hierarchy_socket_pair
[0], &arg_unified_cgroup_hierarchy
, sizeof(arg_unified_cgroup_hierarchy
), 0);
4261 return log_error_errno(errno
, "Failed to read cgroup mode: %m");
4262 if (l
!= sizeof(arg_unified_cgroup_hierarchy
))
4263 return log_error_errno(SYNTHETIC_ERRNO(EIO
), "Short read while reading cgroup mode (%zu bytes).%s",
4264 l
, l
== 0 ? " The child is most likely dead." : "");
4267 /* Wait for the outer child. */
4268 r
= wait_for_terminate_and_check("(sd-namespace)", *pid
, WAIT_LOG_ABNORMAL
);
4271 if (r
!= EXIT_SUCCESS
)
4274 /* And now retrieve the PID of the inner child. */
4275 l
= recv(pid_socket_pair
[0], pid
, sizeof *pid
, 0);
4277 return log_error_errno(errno
, "Failed to read inner child PID: %m");
4278 if (l
!= sizeof *pid
)
4279 return log_error_errno(SYNTHETIC_ERRNO(EIO
), "Short read while reading inner child PID.");
4281 /* We also retrieve container UUID in case it was generated by outer child */
4282 l
= recv(uuid_socket_pair
[0], &arg_uuid
, sizeof arg_uuid
, 0);
4284 return log_error_errno(errno
, "Failed to read container machine ID: %m");
4285 if (l
!= sizeof(arg_uuid
))
4286 return log_error_errno(SYNTHETIC_ERRNO(EIO
), "Short read while reading container machined ID.");
4288 /* We also retrieve the socket used for notifications generated by outer child */
4289 notify_socket
= receive_one_fd(notify_socket_pair
[0], 0);
4290 if (notify_socket
< 0)
4291 return log_error_errno(notify_socket
,
4292 "Failed to receive notification socket from the outer child: %m");
4294 log_debug("Init process invoked as PID "PID_FMT
, *pid
);
4296 if (arg_userns_mode
!= USER_NAMESPACE_NO
) {
4297 if (!barrier_place_and_sync(&barrier
)) /* #1 */
4298 return log_error_errno(SYNTHETIC_ERRNO(ESRCH
), "Child died too early.");
4300 r
= setup_uid_map(*pid
);
4304 (void) barrier_place(&barrier
); /* #2 */
4307 if (arg_private_network
) {
4308 if (!arg_network_namespace_path
) {
4309 /* Wait until the child has unshared its network namespace. */
4310 if (!barrier_place_and_sync(&barrier
)) /* #3 */
4311 return log_error_errno(SYNTHETIC_ERRNO(ESRCH
), "Child died too early");
4314 r
= move_network_interfaces(*pid
, arg_network_interfaces
);
4318 if (arg_network_veth
) {
4319 r
= setup_veth(arg_machine
, *pid
, veth_name
,
4320 arg_network_bridge
|| arg_network_zone
);
4326 if (arg_network_bridge
) {
4327 /* Add the interface to a bridge */
4328 r
= setup_bridge(veth_name
, arg_network_bridge
, false);
4333 } else if (arg_network_zone
) {
4334 /* Add the interface to a bridge, possibly creating it */
4335 r
= setup_bridge(veth_name
, arg_network_zone
, true);
4343 r
= setup_veth_extra(arg_machine
, *pid
, arg_network_veth_extra
);
4347 /* We created the primary and extra veth links now; let's remember this, so that we know to
4348 remove them later on. Note that we don't bother with removing veth links that were created
4349 here when their setup failed half-way, because in that case the kernel should be able to
4350 remove them on its own, since they cannot be referenced by anything yet. */
4351 *veth_created
= true;
4353 r
= setup_macvlan(arg_machine
, *pid
, arg_network_macvlan
);
4357 r
= setup_ipvlan(arg_machine
, *pid
, arg_network_ipvlan
);
4362 if (arg_register
|| !arg_keep_unit
) {
4363 r
= sd_bus_default_system(&bus
);
4365 return log_error_errno(r
, "Failed to open system bus: %m");
4367 r
= sd_bus_set_close_on_exit(bus
, false);
4369 return log_error_errno(r
, "Failed to disable close-on-exit behaviour: %m");
4372 if (!arg_keep_unit
) {
4373 /* When a new scope is created for this container, then we'll be registered as its controller, in which
4374 * case PID 1 will send us a friendly RequestStop signal, when it is asked to terminate the
4375 * scope. Let's hook into that, and cleanly shut down the container, and print a friendly message. */
4377 r
= sd_bus_match_signal_async(
4380 "org.freedesktop.systemd1",
4382 "org.freedesktop.systemd1.Scope",
4384 on_request_stop
, NULL
, PID_TO_PTR(*pid
));
4386 return log_error_errno(r
, "Failed to request RequestStop match: %m");
4390 r
= register_machine(
4398 arg_custom_mounts
, arg_n_custom_mounts
,
4401 arg_property_message
,
4403 arg_container_service_name
);
4407 } else if (!arg_keep_unit
) {
4413 arg_custom_mounts
, arg_n_custom_mounts
,
4416 arg_property_message
);
4420 } else if (arg_slice
|| arg_property
)
4421 log_notice("Machine and scope registration turned off, --slice= and --property= settings will have no effect.");
4423 r
= create_subcgroup(*pid
, arg_keep_unit
, arg_unified_cgroup_hierarchy
);
4427 r
= sync_cgroup(*pid
, arg_unified_cgroup_hierarchy
, arg_uid_shift
);
4431 r
= chown_cgroup(*pid
, arg_unified_cgroup_hierarchy
, arg_uid_shift
);
4435 /* Notify the child that the parent is ready with all
4436 * its setup (including cgroup-ification), and that
4437 * the child can now hand over control to the code to
4438 * run inside the container. */
4439 (void) barrier_place(&barrier
); /* #4 */
4441 /* Block SIGCHLD here, before notifying child.
4442 * process_pty() will handle it with the other signals. */
4443 assert_se(sigprocmask(SIG_BLOCK
, &mask_chld
, NULL
) >= 0);
4445 /* Reset signal to default */
4446 r
= default_signals(SIGCHLD
, -1);
4448 return log_error_errno(r
, "Failed to reset SIGCHLD: %m");
4450 r
= sd_event_new(&event
);
4452 return log_error_errno(r
, "Failed to get default event source: %m");
4454 (void) sd_event_set_watchdog(event
, true);
4457 r
= sd_bus_attach_event(bus
, event
, 0);
4459 return log_error_errno(r
, "Failed to attach bus to event loop: %m");
4462 r
= setup_sd_notify_parent(event
, notify_socket
, PID_TO_PTR(*pid
), ¬ify_event_source
);
4466 /* Let the child know that we are ready and wait that the child is completely ready now. */
4467 if (!barrier_place_and_sync(&barrier
)) /* #5 */
4468 return log_error_errno(SYNTHETIC_ERRNO(ESRCH
), "Child died too early.");
4470 /* At this point we have made use of the UID we picked, and thus nss-mymachines
4471 * will make them appear in getpwuid(), thus we can release the /etc/passwd lock. */
4472 etc_passwd_lock
= safe_close(etc_passwd_lock
);
4474 (void) sd_notifyf(false,
4475 "STATUS=Container running.\n"
4476 "X_NSPAWN_LEADER_PID=" PID_FMT
, *pid
);
4477 if (!arg_notify_ready
)
4478 (void) sd_notify(false, "READY=1\n");
4480 if (arg_kill_signal
> 0) {
4481 /* Try to kill the init system on SIGINT or SIGTERM */
4482 (void) sd_event_add_signal(event
, NULL
, SIGINT
, on_orderly_shutdown
, PID_TO_PTR(*pid
));
4483 (void) sd_event_add_signal(event
, NULL
, SIGTERM
, on_orderly_shutdown
, PID_TO_PTR(*pid
));
4485 /* Immediately exit */
4486 (void) sd_event_add_signal(event
, NULL
, SIGINT
, NULL
, NULL
);
4487 (void) sd_event_add_signal(event
, NULL
, SIGTERM
, NULL
, NULL
);
4490 /* Exit when the child exits */
4491 (void) sd_event_add_signal(event
, NULL
, SIGCHLD
, on_sigchld
, PID_TO_PTR(*pid
));
4493 if (arg_expose_ports
) {
4494 r
= expose_port_watch_rtnl(event
, rtnl_socket_pair
[0], on_address_change
, exposed
, &rtnl
);
4498 (void) expose_port_execute(rtnl
, arg_expose_ports
, exposed
);
4501 rtnl_socket_pair
[0] = safe_close(rtnl_socket_pair
[0]);
4503 if (arg_console_mode
!= CONSOLE_PIPE
) {
4504 _cleanup_close_
int fd
= -1;
4505 PTYForwardFlags flags
= 0;
4507 /* Retrieve the master pty allocated by inner child */
4508 fd
= receive_one_fd(master_pty_socket_pair
[0], 0);
4510 return log_error_errno(fd
, "Failed to receive master pty from the inner child: %m");
4512 switch (arg_console_mode
) {
4514 case CONSOLE_READ_ONLY
:
4515 flags
|= PTY_FORWARD_READ_ONLY
;
4519 case CONSOLE_INTERACTIVE
:
4520 flags
|= PTY_FORWARD_IGNORE_VHANGUP
;
4522 r
= pty_forward_new(event
, fd
, flags
, &forward
);
4524 return log_error_errno(r
, "Failed to create PTY forwarder: %m");
4526 if (arg_console_width
!= (unsigned) -1 || arg_console_height
!= (unsigned) -1)
4527 (void) pty_forward_set_width_height(forward
,
4529 arg_console_height
);
4533 assert(arg_console_mode
== CONSOLE_PASSIVE
);
4536 *master
= TAKE_FD(fd
);
4539 r
= sd_event_loop(event
);
4541 return log_error_errno(r
, "Failed to run event loop: %m");
4546 (void) pty_forward_get_last_char(forward
, &last_char
);
4547 forward
= pty_forward_free(forward
);
4549 if (!arg_quiet
&& last_char
!= '\n')
4553 /* Kill if it is not dead yet anyway */
4556 terminate_machine(bus
, arg_machine
);
4557 else if (!arg_keep_unit
)
4558 terminate_scope(bus
, arg_machine
);
4561 /* Normally redundant, but better safe than sorry */
4562 (void) kill(*pid
, SIGKILL
);
4564 r
= wait_for_container(*pid
, &container_status
);
4568 /* We failed to wait for the container, or the container exited abnormally. */
4570 if (r
> 0 || container_status
== CONTAINER_TERMINATED
) {
4571 /* r > 0 → The container exited with a non-zero status.
4572 * As a special case, we need to replace 133 with a different value,
4573 * because 133 is special-cased in the service file to reboot the container.
4574 * otherwise → The container exited with zero status and a reboot was not requested.
4576 if (r
== EXIT_FORCE_RESTART
)
4577 r
= EXIT_FAILURE
; /* replace 133 with the general failure code */
4579 return 0; /* finito */
4582 /* CONTAINER_REBOOTED, loop again */
4584 if (arg_keep_unit
) {
4585 /* Special handling if we are running as a service: instead of simply
4586 * restarting the machine we want to restart the entire service, so let's
4587 * inform systemd about this with the special exit code 133. The service
4588 * file uses RestartForceExitStatus=133 so that this results in a full
4589 * nspawn restart. This is necessary since we might have cgroup parameters
4590 * set we want to have flushed out. */
4591 *ret
= EXIT_FORCE_RESTART
;
4592 return 0; /* finito */
4595 expose_port_flush(arg_expose_ports
, exposed
);
4597 (void) remove_veth_links(veth_name
, arg_network_veth_extra
);
4598 *veth_created
= false;
4599 return 1; /* loop again */
4602 static int initialize_rlimits(void) {
4603 /* The default resource limits the kernel passes to PID 1, as per kernel 4.16. Let's pass our container payload
4604 * the same values as the kernel originally passed to PID 1, in order to minimize differences between host and
4605 * container execution environments. */
4607 static const struct rlimit kernel_defaults
[_RLIMIT_MAX
] = {
4608 [RLIMIT_AS
] = { RLIM_INFINITY
, RLIM_INFINITY
},
4609 [RLIMIT_CORE
] = { 0, RLIM_INFINITY
},
4610 [RLIMIT_CPU
] = { RLIM_INFINITY
, RLIM_INFINITY
},
4611 [RLIMIT_DATA
] = { RLIM_INFINITY
, RLIM_INFINITY
},
4612 [RLIMIT_FSIZE
] = { RLIM_INFINITY
, RLIM_INFINITY
},
4613 [RLIMIT_LOCKS
] = { RLIM_INFINITY
, RLIM_INFINITY
},
4614 [RLIMIT_MEMLOCK
] = { 65536, 65536 },
4615 [RLIMIT_MSGQUEUE
] = { 819200, 819200 },
4616 [RLIMIT_NICE
] = { 0, 0 },
4617 [RLIMIT_NOFILE
] = { 1024, 4096 },
4618 [RLIMIT_RSS
] = { RLIM_INFINITY
, RLIM_INFINITY
},
4619 [RLIMIT_RTPRIO
] = { 0, 0 },
4620 [RLIMIT_RTTIME
] = { RLIM_INFINITY
, RLIM_INFINITY
},
4621 [RLIMIT_STACK
] = { 8388608, RLIM_INFINITY
},
4623 /* The kernel scales the default for RLIMIT_NPROC and RLIMIT_SIGPENDING based on the system's amount of
4624 * RAM. To provide best compatibility we'll read these limits off PID 1 instead of hardcoding them
4625 * here. This is safe as we know that PID 1 doesn't change these two limits and thus the original
4626 * kernel's initialization should still be valid during runtime — at least if PID 1 is systemd. Note
4627 * that PID 1 changes a number of other resource limits during early initialization which is why we
4628 * don't read the other limits from PID 1 but prefer the static table above. */
4633 for (rl
= 0; rl
< _RLIMIT_MAX
; rl
++) {
4634 /* Let's only fill in what the user hasn't explicitly configured anyway */
4635 if ((arg_settings_mask
& (SETTING_RLIMIT_FIRST
<< rl
)) == 0) {
4636 const struct rlimit
*v
;
4637 struct rlimit buffer
;
4639 if (IN_SET(rl
, RLIMIT_NPROC
, RLIMIT_SIGPENDING
)) {
4640 /* For these two let's read the limits off PID 1. See above for an explanation. */
4642 if (prlimit(1, rl
, NULL
, &buffer
) < 0)
4643 return log_error_errno(errno
, "Failed to read resource limit RLIMIT_%s of PID 1: %m", rlimit_to_string(rl
));
4647 v
= kernel_defaults
+ rl
;
4649 arg_rlimit
[rl
] = newdup(struct rlimit
, v
, 1);
4650 if (!arg_rlimit
[rl
])
4654 if (DEBUG_LOGGING
) {
4655 _cleanup_free_
char *k
= NULL
;
4657 (void) rlimit_format(arg_rlimit
[rl
], &k
);
4658 log_debug("Setting RLIMIT_%s to %s.", rlimit_to_string(rl
), k
);
4665 static int run(int argc
, char *argv
[]) {
4666 bool secondary
= false, remove_directory
= false, remove_image
= false,
4667 veth_created
= false, remove_tmprootdir
= false;
4668 _cleanup_close_
int master
= -1;
4669 _cleanup_fdset_free_ FDSet
*fds
= NULL
;
4670 int r
, n_fd_passed
, ret
= EXIT_SUCCESS
;
4671 char veth_name
[IFNAMSIZ
] = "";
4672 union in_addr_union exposed
= {};
4673 _cleanup_(release_lock_file
) LockFile tree_global_lock
= LOCK_FILE_INIT
, tree_local_lock
= LOCK_FILE_INIT
;
4674 char tmprootdir
[] = "/tmp/nspawn-root-XXXXXX";
4675 _cleanup_(loop_device_unrefp
) LoopDevice
*loop
= NULL
;
4676 _cleanup_(decrypted_image_unrefp
) DecryptedImage
*decrypted_image
= NULL
;
4677 _cleanup_(dissected_image_unrefp
) DissectedImage
*dissected_image
= NULL
;
4680 log_parse_environment();
4683 r
= parse_argv(argc
, argv
);
4691 r
= initialize_rlimits();
4695 r
= load_oci_bundle();
4699 r
= determine_names();
4703 r
= load_settings();
4707 r
= cg_unified_flush();
4709 log_error_errno(r
, "Failed to determine whether the unified cgroups hierarchy is used: %m");
4713 r
= verify_arguments();
4717 r
= detect_unified_cgroup_hierarchy_from_environment();
4721 /* Ignore SIGPIPE here, because we use splice() on the ptyfwd stuff and that will generate SIGPIPE if
4722 * the result is closed. Note that the container payload child will reset signal mask+handler anyway,
4723 * so just turning this off here means we only turn it off in nspawn itself, not any children. */
4724 (void) ignore_signals(SIGPIPE
, -1);
4726 n_fd_passed
= sd_listen_fds(false);
4727 if (n_fd_passed
> 0) {
4728 r
= fdset_new_listen_fds(&fds
, false);
4730 log_error_errno(r
, "Failed to collect file descriptors: %m");
4735 /* The "default" umask. This is appropriate for most file and directory
4736 * operations performed by nspawn, and is the umask that will be used for
4737 * the child. Functions like copy_devnodes() change the umask temporarily. */
4740 if (arg_directory
) {
4743 if (path_equal(arg_directory
, "/") && !arg_ephemeral
) {
4744 log_error("Spawning container on root directory is not supported. Consider using --ephemeral.");
4749 if (arg_ephemeral
) {
4750 _cleanup_free_
char *np
= NULL
;
4752 r
= chase_symlinks_and_update(&arg_directory
, 0);
4756 /* If the specified path is a mount point we generate the new snapshot immediately
4757 * inside it under a random name. However if the specified is not a mount point we
4758 * create the new snapshot in the parent directory, just next to it. */
4759 r
= path_is_mount_point(arg_directory
, NULL
, 0);
4761 log_error_errno(r
, "Failed to determine whether directory %s is mount point: %m", arg_directory
);
4765 r
= tempfn_random_child(arg_directory
, "machine.", &np
);
4767 r
= tempfn_random(arg_directory
, "machine.", &np
);
4769 log_error_errno(r
, "Failed to generate name for directory snapshot: %m");
4773 r
= image_path_lock(np
, (arg_read_only
? LOCK_SH
: LOCK_EX
) | LOCK_NB
, &tree_global_lock
, &tree_local_lock
);
4775 log_error_errno(r
, "Failed to lock %s: %m", np
);
4780 BLOCK_SIGNALS(SIGINT
);
4781 r
= btrfs_subvol_snapshot(arg_directory
, np
,
4782 (arg_read_only
? BTRFS_SNAPSHOT_READ_ONLY
: 0) |
4783 BTRFS_SNAPSHOT_FALLBACK_COPY
|
4784 BTRFS_SNAPSHOT_FALLBACK_DIRECTORY
|
4785 BTRFS_SNAPSHOT_RECURSIVE
|
4786 BTRFS_SNAPSHOT_QUOTA
|
4787 BTRFS_SNAPSHOT_SIGINT
);
4790 log_error_errno(r
, "Interrupted while copying file system tree to %s, removed again.", np
);
4794 log_error_errno(r
, "Failed to create snapshot %s from %s: %m", np
, arg_directory
);
4798 free_and_replace(arg_directory
, np
);
4799 remove_directory
= true;
4801 r
= chase_symlinks_and_update(&arg_directory
, arg_template
? CHASE_NONEXISTENT
: 0);
4805 r
= image_path_lock(arg_directory
, (arg_read_only
? LOCK_SH
: LOCK_EX
) | LOCK_NB
, &tree_global_lock
, &tree_local_lock
);
4807 log_error_errno(r
, "Directory tree %s is currently busy.", arg_directory
);
4811 log_error_errno(r
, "Failed to lock %s: %m", arg_directory
);
4816 r
= chase_symlinks_and_update(&arg_template
, 0);
4821 BLOCK_SIGNALS(SIGINT
);
4822 r
= btrfs_subvol_snapshot(arg_template
, arg_directory
,
4823 (arg_read_only
? BTRFS_SNAPSHOT_READ_ONLY
: 0) |
4824 BTRFS_SNAPSHOT_FALLBACK_COPY
|
4825 BTRFS_SNAPSHOT_FALLBACK_DIRECTORY
|
4826 BTRFS_SNAPSHOT_FALLBACK_IMMUTABLE
|
4827 BTRFS_SNAPSHOT_RECURSIVE
|
4828 BTRFS_SNAPSHOT_QUOTA
|
4829 BTRFS_SNAPSHOT_SIGINT
);
4832 log_full(arg_quiet
? LOG_DEBUG
: LOG_INFO
,
4833 "Directory %s already exists, not populating from template %s.", arg_directory
, arg_template
);
4834 else if (r
== -EINTR
) {
4835 log_error_errno(r
, "Interrupted while copying file system tree to %s, removed again.", arg_directory
);
4838 log_error_errno(r
, "Couldn't create snapshot %s from %s: %m", arg_directory
, arg_template
);
4841 log_full(arg_quiet
? LOG_DEBUG
: LOG_INFO
,
4842 "Populated %s from template %s.", arg_directory
, arg_template
);
4846 if (arg_start_mode
== START_BOOT
) {
4849 if (arg_pivot_root_new
)
4850 p
= prefix_roota(arg_directory
, arg_pivot_root_new
);
4854 if (path_is_os_tree(p
) <= 0) {
4855 log_error("Directory %s doesn't look like an OS root directory (os-release file is missing). Refusing.", p
);
4862 if (arg_pivot_root_new
)
4863 p
= prefix_roota(arg_directory
, arg_pivot_root_new
);
4867 q
= strjoina(p
, "/usr/");
4869 if (laccess(q
, F_OK
) < 0) {
4870 log_error("Directory %s doesn't look like it has an OS tree. Refusing.", p
);
4878 assert(!arg_template
);
4880 r
= chase_symlinks_and_update(&arg_image
, 0);
4884 if (arg_ephemeral
) {
4885 _cleanup_free_
char *np
= NULL
;
4887 r
= tempfn_random(arg_image
, "machine.", &np
);
4889 log_error_errno(r
, "Failed to generate name for image snapshot: %m");
4893 r
= image_path_lock(np
, (arg_read_only
? LOCK_SH
: LOCK_EX
) | LOCK_NB
, &tree_global_lock
, &tree_local_lock
);
4895 r
= log_error_errno(r
, "Failed to create image lock: %m");
4900 BLOCK_SIGNALS(SIGINT
);
4901 r
= copy_file(arg_image
, np
, O_EXCL
, arg_read_only
? 0400 : 0600, FS_NOCOW_FL
, FS_NOCOW_FL
, COPY_REFLINK
|COPY_CRTIME
|COPY_SIGINT
);
4904 log_error_errno(r
, "Interrupted while copying image file to %s, removed again.", np
);
4908 r
= log_error_errno(r
, "Failed to copy image file: %m");
4912 free_and_replace(arg_image
, np
);
4913 remove_image
= true;
4915 r
= image_path_lock(arg_image
, (arg_read_only
? LOCK_SH
: LOCK_EX
) | LOCK_NB
, &tree_global_lock
, &tree_local_lock
);
4917 r
= log_error_errno(r
, "Disk image %s is currently busy.", arg_image
);
4921 r
= log_error_errno(r
, "Failed to create image lock: %m");
4925 if (!arg_root_hash
) {
4926 r
= root_hash_load(arg_image
, &arg_root_hash
, &arg_root_hash_size
);
4928 log_error_errno(r
, "Failed to load root hash file for %s: %m", arg_image
);
4934 if (!mkdtemp(tmprootdir
)) {
4935 r
= log_error_errno(errno
, "Failed to create temporary directory: %m");
4939 remove_tmprootdir
= true;
4941 arg_directory
= strdup(tmprootdir
);
4942 if (!arg_directory
) {
4947 r
= loop_device_make_by_path(arg_image
, arg_read_only
? O_RDONLY
: O_RDWR
, &loop
);
4949 log_error_errno(r
, "Failed to set up loopback block device: %m");
4953 r
= dissect_image_and_warn(
4956 arg_root_hash
, arg_root_hash_size
,
4957 DISSECT_IMAGE_REQUIRE_ROOT
,
4960 /* dissected_image_and_warn() already printed a brief error message. Extend on that with more details */
4961 log_notice("Note that the disk image needs to\n"
4962 " a) either contain only a single MBR partition of type 0x83 that is marked bootable\n"
4963 " b) or contain a single GPT partition of type 0FC63DAF-8483-4772-8E79-3D69D8477DE4\n"
4964 " c) or follow http://www.freedesktop.org/wiki/Specifications/DiscoverablePartitionsSpec/\n"
4965 " d) or contain a file system without a partition table\n"
4966 "in order to be bootable with systemd-nspawn.");
4972 if (!arg_root_hash
&& dissected_image
->can_verity
)
4973 log_notice("Note: image %s contains verity information, but no root hash specified! Proceeding without integrity checking.", arg_image
);
4975 r
= dissected_image_decrypt_interactively(dissected_image
, NULL
, arg_root_hash
, arg_root_hash_size
, 0, &decrypted_image
);
4979 /* Now that we mounted the image, let's try to remove it again, if it is ephemeral */
4980 if (remove_image
&& unlink(arg_image
) >= 0)
4981 remove_image
= false;
4984 r
= custom_mount_prepare_all(arg_directory
, arg_custom_mounts
, arg_n_custom_mounts
);
4988 if (arg_console_mode
< 0)
4990 isatty(STDIN_FILENO
) > 0 &&
4991 isatty(STDOUT_FILENO
) > 0 ? CONSOLE_INTERACTIVE
: CONSOLE_READ_ONLY
;
4993 if (arg_console_mode
== CONSOLE_PIPE
) /* if we pass STDERR on to the container, don't add our own logs into it too */
4997 log_info("Spawning container %s on %s.\nPress ^] three times within 1s to kill container.",
4998 arg_machine
, arg_image
?: arg_directory
);
5000 assert_se(sigprocmask_many(SIG_BLOCK
, NULL
, SIGCHLD
, SIGWINCH
, SIGTERM
, SIGINT
, -1) >= 0);
5002 if (prctl(PR_SET_CHILD_SUBREAPER
, 1, 0, 0, 0) < 0) {
5003 r
= log_error_errno(errno
, "Failed to become subreaper: %m");
5008 r
= run_container(dissected_image
,
5011 veth_name
, &veth_created
,
5019 (void) sd_notify(false,
5020 r
== 0 && ret
== EXIT_FORCE_RESTART
? "STOPPING=1\nSTATUS=Restarting..." :
5021 "STOPPING=1\nSTATUS=Terminating...");
5024 (void) kill(pid
, SIGKILL
);
5026 /* Try to flush whatever is still queued in the pty */
5028 (void) copy_bytes(master
, STDOUT_FILENO
, (uint64_t) -1, 0);
5029 master
= safe_close(master
);
5033 (void) wait_for_terminate(pid
, NULL
);
5037 if (remove_directory
&& arg_directory
) {
5040 k
= rm_rf(arg_directory
, REMOVE_ROOT
|REMOVE_PHYSICAL
|REMOVE_SUBVOLUME
);
5042 log_warning_errno(k
, "Cannot remove '%s', ignoring: %m", arg_directory
);
5045 if (remove_image
&& arg_image
) {
5046 if (unlink(arg_image
) < 0)
5047 log_warning_errno(errno
, "Can't remove image file '%s', ignoring: %m", arg_image
);
5050 if (remove_tmprootdir
) {
5051 if (rmdir(tmprootdir
) < 0)
5052 log_debug_errno(errno
, "Can't remove temporary root directory '%s', ignoring: %m", tmprootdir
);
5058 p
= strjoina("/run/systemd/nspawn/propagate/", arg_machine
);
5059 (void) rm_rf(p
, REMOVE_ROOT
);
5062 expose_port_flush(arg_expose_ports
, &exposed
);
5065 (void) remove_veth_links(veth_name
, arg_network_veth_extra
);
5066 (void) remove_bridge(arg_network_zone
);
5068 custom_mount_free_all(arg_custom_mounts
, arg_n_custom_mounts
);
5069 expose_port_free_all(arg_expose_ports
);
5070 rlimit_free_all(arg_rlimit
);
5071 device_node_array_free(arg_extra_nodes
, arg_n_extra_nodes
);
5079 DEFINE_MAIN_FUNCTION_WITH_POSITIVE_FAILURE(run
);