1 /* SPDX-License-Identifier: LGPL-2.1+ */
8 #include <linux/loop.h>
10 #include <selinux/selinux.h>
14 #include <sys/personality.h>
15 #include <sys/prctl.h>
16 #include <sys/types.h>
21 #include "sd-daemon.h"
24 #include "alloc-util.h"
26 #include "base-filesystem.h"
27 #include "blkid-util.h"
28 #include "btrfs-util.h"
29 #include "bus-error.h"
32 #include "capability-util.h"
33 #include "cgroup-util.h"
35 #include "cpu-set-util.h"
36 #include "dev-setup.h"
37 #include "dissect-image.h"
42 #include "format-util.h"
45 #include "hexdecoct.h"
46 #include "hostname-util.h"
47 #include "id128-util.h"
49 #include "loop-util.h"
50 #include "loopback-setup.h"
51 #include "machine-image.h"
53 #include "main-func.h"
54 #include "missing_sched.h"
56 #include "mount-util.h"
57 #include "mountpoint-util.h"
58 #include "namespace-util.h"
59 #include "netlink-util.h"
60 #include "nspawn-cgroup.h"
61 #include "nspawn-def.h"
62 #include "nspawn-expose-ports.h"
63 #include "nspawn-mount.h"
64 #include "nspawn-network.h"
65 #include "nspawn-oci.h"
66 #include "nspawn-patch-uid.h"
67 #include "nspawn-register.h"
68 #include "nspawn-seccomp.h"
69 #include "nspawn-settings.h"
70 #include "nspawn-setuid.h"
71 #include "nspawn-stub-pid1.h"
72 #include "nulstr-util.h"
75 #include "parse-util.h"
76 #include "path-util.h"
77 #include "pretty-print.h"
78 #include "process-util.h"
80 #include "random-util.h"
81 #include "raw-clone.h"
82 #include "resolve-util.h"
83 #include "rlimit-util.h"
86 #include "seccomp-util.h"
88 #include "selinux-util.h"
89 #include "signal-util.h"
90 #include "socket-util.h"
91 #include "stat-util.h"
92 #include "stdio-util.h"
93 #include "string-table.h"
94 #include "string-util.h"
96 #include "sysctl-util.h"
97 #include "terminal-util.h"
98 #include "tmpfile-util.h"
99 #include "umask-util.h"
100 #include "unit-name.h"
101 #include "user-util.h"
104 /* nspawn is listening on the socket at the path in the constant nspawn_notify_socket_path
105 * nspawn_notify_socket_path is relative to the container
106 * the init process in the container pid can send messages to nspawn following the sd_notify(3) protocol */
107 #define NSPAWN_NOTIFY_SOCKET_PATH "/run/systemd/nspawn/notify"
109 #define EXIT_FORCE_RESTART 133
111 typedef enum ContainerStatus
{
112 CONTAINER_TERMINATED
,
116 static char *arg_directory
= NULL
;
117 static char *arg_template
= NULL
;
118 static char *arg_chdir
= NULL
;
119 static char *arg_pivot_root_new
= NULL
;
120 static char *arg_pivot_root_old
= NULL
;
121 static char *arg_user
= NULL
;
122 static uid_t arg_uid
= UID_INVALID
;
123 static gid_t arg_gid
= GID_INVALID
;
124 static gid_t
* arg_supplementary_gids
= NULL
;
125 static size_t arg_n_supplementary_gids
= 0;
126 static sd_id128_t arg_uuid
= {};
127 static char *arg_machine
= NULL
; /* The name used by the host to refer to this */
128 static char *arg_hostname
= NULL
; /* The name the payload sees by default */
129 static const char *arg_selinux_context
= NULL
;
130 static const char *arg_selinux_apifs_context
= NULL
;
131 static char *arg_slice
= NULL
;
132 static bool arg_private_network
= false;
133 static bool arg_read_only
= false;
134 static StartMode arg_start_mode
= START_PID1
;
135 static bool arg_ephemeral
= false;
136 static LinkJournal arg_link_journal
= LINK_AUTO
;
137 static bool arg_link_journal_try
= false;
138 static uint64_t arg_caps_retain
=
139 (1ULL << CAP_AUDIT_CONTROL
) |
140 (1ULL << CAP_AUDIT_WRITE
) |
141 (1ULL << CAP_CHOWN
) |
142 (1ULL << CAP_DAC_OVERRIDE
) |
143 (1ULL << CAP_DAC_READ_SEARCH
) |
144 (1ULL << CAP_FOWNER
) |
145 (1ULL << CAP_FSETID
) |
146 (1ULL << CAP_IPC_OWNER
) |
148 (1ULL << CAP_LEASE
) |
149 (1ULL << CAP_LINUX_IMMUTABLE
) |
150 (1ULL << CAP_MKNOD
) |
151 (1ULL << CAP_NET_BIND_SERVICE
) |
152 (1ULL << CAP_NET_BROADCAST
) |
153 (1ULL << CAP_NET_RAW
) |
154 (1ULL << CAP_SETFCAP
) |
155 (1ULL << CAP_SETGID
) |
156 (1ULL << CAP_SETPCAP
) |
157 (1ULL << CAP_SETUID
) |
158 (1ULL << CAP_SYS_ADMIN
) |
159 (1ULL << CAP_SYS_BOOT
) |
160 (1ULL << CAP_SYS_CHROOT
) |
161 (1ULL << CAP_SYS_NICE
) |
162 (1ULL << CAP_SYS_PTRACE
) |
163 (1ULL << CAP_SYS_RESOURCE
) |
164 (1ULL << CAP_SYS_TTY_CONFIG
);
165 static CapabilityQuintet arg_full_capabilities
= CAPABILITY_QUINTET_NULL
;
166 static CustomMount
*arg_custom_mounts
= NULL
;
167 static size_t arg_n_custom_mounts
= 0;
168 static char **arg_setenv
= NULL
;
169 static bool arg_quiet
= false;
170 static bool arg_register
= true;
171 static bool arg_keep_unit
= false;
172 static char **arg_network_interfaces
= NULL
;
173 static char **arg_network_macvlan
= NULL
;
174 static char **arg_network_ipvlan
= NULL
;
175 static bool arg_network_veth
= false;
176 static char **arg_network_veth_extra
= NULL
;
177 static char *arg_network_bridge
= NULL
;
178 static char *arg_network_zone
= NULL
;
179 static char *arg_network_namespace_path
= NULL
;
180 static PagerFlags arg_pager_flags
= 0;
181 static unsigned long arg_personality
= PERSONALITY_INVALID
;
182 static char *arg_image
= NULL
;
183 static char *arg_oci_bundle
= NULL
;
184 static VolatileMode arg_volatile_mode
= VOLATILE_NO
;
185 static ExposePort
*arg_expose_ports
= NULL
;
186 static char **arg_property
= NULL
;
187 static sd_bus_message
*arg_property_message
= NULL
;
188 static UserNamespaceMode arg_userns_mode
= USER_NAMESPACE_NO
;
189 static uid_t arg_uid_shift
= UID_INVALID
, arg_uid_range
= 0x10000U
;
190 static bool arg_userns_chown
= false;
191 static int arg_kill_signal
= 0;
192 static CGroupUnified arg_unified_cgroup_hierarchy
= CGROUP_UNIFIED_UNKNOWN
;
193 static SettingsMask arg_settings_mask
= 0;
194 static int arg_settings_trusted
= -1;
195 static char **arg_parameters
= NULL
;
196 static const char *arg_container_service_name
= "systemd-nspawn";
197 static bool arg_notify_ready
= false;
198 static bool arg_use_cgns
= true;
199 static unsigned long arg_clone_ns_flags
= CLONE_NEWIPC
|CLONE_NEWPID
|CLONE_NEWUTS
;
200 static MountSettingsMask arg_mount_settings
= MOUNT_APPLY_APIVFS_RO
|MOUNT_APPLY_TMPFS_TMP
;
201 static void *arg_root_hash
= NULL
;
202 static char *arg_verity_data
= NULL
;
203 static char *arg_root_hash_sig_path
= NULL
;
204 static void *arg_root_hash_sig
= NULL
;
205 static size_t arg_root_hash_sig_size
= 0;
206 static size_t arg_root_hash_size
= 0;
207 static char **arg_syscall_allow_list
= NULL
;
208 static char **arg_syscall_deny_list
= NULL
;
210 static scmp_filter_ctx arg_seccomp
= NULL
;
212 static struct rlimit
*arg_rlimit
[_RLIMIT_MAX
] = {};
213 static bool arg_no_new_privileges
= false;
214 static int arg_oom_score_adjust
= 0;
215 static bool arg_oom_score_adjust_set
= false;
216 static CPUSet arg_cpu_set
= {};
217 static ResolvConfMode arg_resolv_conf
= RESOLV_CONF_AUTO
;
218 static TimezoneMode arg_timezone
= TIMEZONE_AUTO
;
219 static unsigned arg_console_width
= (unsigned) -1, arg_console_height
= (unsigned) -1;
220 static DeviceNode
* arg_extra_nodes
= NULL
;
221 static size_t arg_n_extra_nodes
= 0;
222 static char **arg_sysctl
= NULL
;
223 static ConsoleMode arg_console_mode
= _CONSOLE_MODE_INVALID
;
225 STATIC_DESTRUCTOR_REGISTER(arg_directory
, freep
);
226 STATIC_DESTRUCTOR_REGISTER(arg_template
, freep
);
227 STATIC_DESTRUCTOR_REGISTER(arg_chdir
, freep
);
228 STATIC_DESTRUCTOR_REGISTER(arg_pivot_root_new
, freep
);
229 STATIC_DESTRUCTOR_REGISTER(arg_pivot_root_old
, freep
);
230 STATIC_DESTRUCTOR_REGISTER(arg_user
, freep
);
231 STATIC_DESTRUCTOR_REGISTER(arg_supplementary_gids
, freep
);
232 STATIC_DESTRUCTOR_REGISTER(arg_machine
, freep
);
233 STATIC_DESTRUCTOR_REGISTER(arg_hostname
, freep
);
234 STATIC_DESTRUCTOR_REGISTER(arg_slice
, freep
);
235 STATIC_DESTRUCTOR_REGISTER(arg_setenv
, strv_freep
);
236 STATIC_DESTRUCTOR_REGISTER(arg_network_interfaces
, strv_freep
);
237 STATIC_DESTRUCTOR_REGISTER(arg_network_macvlan
, strv_freep
);
238 STATIC_DESTRUCTOR_REGISTER(arg_network_ipvlan
, strv_freep
);
239 STATIC_DESTRUCTOR_REGISTER(arg_network_veth_extra
, strv_freep
);
240 STATIC_DESTRUCTOR_REGISTER(arg_network_bridge
, freep
);
241 STATIC_DESTRUCTOR_REGISTER(arg_network_zone
, freep
);
242 STATIC_DESTRUCTOR_REGISTER(arg_network_namespace_path
, freep
);
243 STATIC_DESTRUCTOR_REGISTER(arg_image
, freep
);
244 STATIC_DESTRUCTOR_REGISTER(arg_oci_bundle
, freep
);
245 STATIC_DESTRUCTOR_REGISTER(arg_property
, strv_freep
);
246 STATIC_DESTRUCTOR_REGISTER(arg_property_message
, sd_bus_message_unrefp
);
247 STATIC_DESTRUCTOR_REGISTER(arg_parameters
, strv_freep
);
248 STATIC_DESTRUCTOR_REGISTER(arg_root_hash
, freep
);
249 STATIC_DESTRUCTOR_REGISTER(arg_verity_data
, freep
);
250 STATIC_DESTRUCTOR_REGISTER(arg_root_hash_sig_path
, freep
);
251 STATIC_DESTRUCTOR_REGISTER(arg_root_hash_sig
, freep
);
252 STATIC_DESTRUCTOR_REGISTER(arg_syscall_allow_list
, strv_freep
);
253 STATIC_DESTRUCTOR_REGISTER(arg_syscall_deny_list
, strv_freep
);
255 STATIC_DESTRUCTOR_REGISTER(arg_seccomp
, seccomp_releasep
);
257 STATIC_DESTRUCTOR_REGISTER(arg_cpu_set
, cpu_set_reset
);
258 STATIC_DESTRUCTOR_REGISTER(arg_sysctl
, strv_freep
);
260 static int handle_arg_console(const char *arg
) {
261 if (streq(arg
, "help")) {
269 if (streq(arg
, "interactive"))
270 arg_console_mode
= CONSOLE_INTERACTIVE
;
271 else if (streq(arg
, "read-only"))
272 arg_console_mode
= CONSOLE_READ_ONLY
;
273 else if (streq(arg
, "passive"))
274 arg_console_mode
= CONSOLE_PASSIVE
;
275 else if (streq(arg
, "pipe"))
276 arg_console_mode
= CONSOLE_PIPE
;
278 return log_error_errno(SYNTHETIC_ERRNO(EINVAL
), "Unknown console mode: %s", optarg
);
280 arg_settings_mask
|= SETTING_CONSOLE_MODE
;
284 static int help(void) {
285 _cleanup_free_
char *link
= NULL
;
288 (void) pager_open(arg_pager_flags
);
290 r
= terminal_urlify_man("systemd-nspawn", "1", &link
);
294 printf("%1$s [OPTIONS...] [PATH] [ARGUMENTS...]\n\n"
295 "%5$sSpawn a command or OS in a light-weight container.%6$s\n\n"
296 " -h --help Show this help\n"
297 " --version Print version string\n"
298 " -q --quiet Do not show status information\n"
299 " --no-pager Do not pipe output into a pager\n"
300 " --settings=BOOLEAN Load additional settings from .nspawn file\n\n"
302 " -D --directory=PATH Root directory for the container\n"
303 " --template=PATH Initialize root directory from template directory,\n"
305 " -x --ephemeral Run container with snapshot of root directory, and\n"
306 " remove it after exit\n"
307 " -i --image=PATH Root file system disk image (or device node) for\n"
309 " --oci-bundle=PATH OCI bundle directory\n"
310 " --read-only Mount the root directory read-only\n"
311 " --volatile[=MODE] Run the system in volatile mode\n"
312 " --root-hash=HASH Specify verity root hash for root disk image\n"
313 " --root-hash-sig=SIG Specify pkcs7 signature of root hash for verity\n"
314 " as a DER encoded PKCS7, either as a path to a file\n"
315 " or as an ASCII base64 encoded string prefixed by\n"
317 " --verity-data=PATH Specify hash device for verity\n"
318 " --pivot-root=PATH[:PATH]\n"
319 " Pivot root to given directory in the container\n\n"
320 "%3$sExecution:%4$s\n"
321 " -a --as-pid2 Maintain a stub init as PID1, invoke binary as PID2\n"
322 " -b --boot Boot up full system (i.e. invoke init)\n"
323 " --chdir=PATH Set working directory in the container\n"
324 " -E --setenv=NAME=VALUE Pass an environment variable to PID 1\n"
325 " -u --user=USER Run the command under specified user or UID\n"
326 " --kill-signal=SIGNAL Select signal to use for shutting down PID 1\n"
327 " --notify-ready=BOOLEAN Receive notifications from the child init process\n\n"
328 "%3$sSystem Identity:%4$s\n"
329 " -M --machine=NAME Set the machine name for the container\n"
330 " --hostname=NAME Override the hostname for the container\n"
331 " --uuid=UUID Set a specific machine UUID for the container\n\n"
332 "%3$sProperties:%4$s\n"
333 " -S --slice=SLICE Place the container in the specified slice\n"
334 " --property=NAME=VALUE Set scope unit property\n"
335 " --register=BOOLEAN Register container as machine\n"
336 " --keep-unit Do not register a scope for the machine, reuse\n"
337 " the service unit nspawn is running in\n\n"
338 "%3$sUser Namespacing:%4$s\n"
339 " -U --private-users=pick Run within user namespace, autoselect UID/GID range\n"
340 " --private-users[=UIDBASE[:NUIDS]]\n"
341 " Similar, but with user configured UID/GID range\n"
342 " --private-users-chown Adjust OS tree ownership to private UID/GID range\n\n"
343 "%3$sNetworking:%4$s\n"
344 " --private-network Disable network in container\n"
345 " --network-interface=INTERFACE\n"
346 " Assign an existing network interface to the\n"
348 " --network-macvlan=INTERFACE\n"
349 " Create a macvlan network interface based on an\n"
350 " existing network interface to the container\n"
351 " --network-ipvlan=INTERFACE\n"
352 " Create a ipvlan network interface based on an\n"
353 " existing network interface to the container\n"
354 " -n --network-veth Add a virtual Ethernet connection between host\n"
356 " --network-veth-extra=HOSTIF[:CONTAINERIF]\n"
357 " Add an additional virtual Ethernet link between\n"
358 " host and container\n"
359 " --network-bridge=INTERFACE\n"
360 " Add a virtual Ethernet connection to the container\n"
361 " and attach it to an existing bridge on the host\n"
362 " --network-zone=NAME Similar, but attach the new interface to an\n"
363 " an automatically managed bridge interface\n"
364 " --network-namespace-path=PATH\n"
365 " Set network namespace to the one represented by\n"
366 " the specified kernel namespace file node\n"
367 " -p --port=[PROTOCOL:]HOSTPORT[:CONTAINERPORT]\n"
368 " Expose a container IP port on the host\n\n"
369 "%3$sSecurity:%4$s\n"
370 " --capability=CAP In addition to the default, retain specified\n"
372 " --drop-capability=CAP Drop the specified capability from the default set\n"
373 " --no-new-privileges Set PR_SET_NO_NEW_PRIVS flag for container payload\n"
374 " --system-call-filter=LIST|~LIST\n"
375 " Permit/prohibit specific system calls\n"
376 " -Z --selinux-context=SECLABEL\n"
377 " Set the SELinux security context to be used by\n"
378 " processes in the container\n"
379 " -L --selinux-apifs-context=SECLABEL\n"
380 " Set the SELinux security context to be used by\n"
381 " API/tmpfs file systems in the container\n\n"
382 "%3$sResources:%4$s\n"
383 " --rlimit=NAME=LIMIT Set a resource limit for the payload\n"
384 " --oom-score-adjust=VALUE\n"
385 " Adjust the OOM score value for the payload\n"
386 " --cpu-affinity=CPUS Adjust the CPU affinity of the container\n"
387 " --personality=ARCH Pick personality for this container\n\n"
388 "%3$sIntegration:%4$s\n"
389 " --resolv-conf=MODE Select mode of /etc/resolv.conf initialization\n"
390 " --timezone=MODE Select mode of /etc/localtime initialization\n"
391 " --link-journal=MODE Link up guest journal, one of no, auto, guest, \n"
392 " host, try-guest, try-host\n"
393 " -j Equivalent to --link-journal=try-guest\n\n"
395 " --bind=PATH[:PATH[:OPTIONS]]\n"
396 " Bind mount a file or directory from the host into\n"
398 " --bind-ro=PATH[:PATH[:OPTIONS]\n"
399 " Similar, but creates a read-only bind mount\n"
400 " --inaccessible=PATH Over-mount file node with inaccessible node to mask\n"
402 " --tmpfs=PATH:[OPTIONS] Mount an empty tmpfs to the specified directory\n"
403 " --overlay=PATH[:PATH...]:PATH\n"
404 " Create an overlay mount from the host to \n"
406 " --overlay-ro=PATH[:PATH...]:PATH\n"
407 " Similar, but creates a read-only overlay mount\n\n"
408 "%3$sInput/Output:%4$s\n"
409 " --console=MODE Select how stdin/stdout/stderr and /dev/console are\n"
410 " set up for the container.\n"
411 " -P --pipe Equivalent to --console=pipe\n"
412 "\nSee the %2$s for details.\n"
413 , program_invocation_short_name
415 , ansi_underline(), ansi_normal()
416 , ansi_highlight(), ansi_normal()
422 static int custom_mount_check_all(void) {
425 for (i
= 0; i
< arg_n_custom_mounts
; i
++) {
426 CustomMount
*m
= &arg_custom_mounts
[i
];
428 if (path_equal(m
->destination
, "/") && arg_userns_mode
!= USER_NAMESPACE_NO
) {
429 if (arg_userns_chown
)
430 return log_error_errno(SYNTHETIC_ERRNO(EINVAL
),
431 "--private-users-chown may not be combined with custom root mounts.");
432 else if (arg_uid_shift
== UID_INVALID
)
433 return log_error_errno(SYNTHETIC_ERRNO(EINVAL
),
434 "--private-users with automatic UID shift may not be combined with custom root mounts.");
441 static int detect_unified_cgroup_hierarchy_from_environment(void) {
442 const char *e
, *var
= "SYSTEMD_NSPAWN_UNIFIED_HIERARCHY";
445 /* Allow the user to control whether the unified hierarchy is used */
449 /* $UNIFIED_CGROUP_HIERARCHY has been renamed to $SYSTEMD_NSPAWN_UNIFIED_HIERARCHY. */
450 var
= "UNIFIED_CGROUP_HIERARCHY";
455 r
= parse_boolean(e
);
457 return log_error_errno(r
, "Failed to parse $%s: %m", var
);
459 arg_unified_cgroup_hierarchy
= CGROUP_UNIFIED_ALL
;
461 arg_unified_cgroup_hierarchy
= CGROUP_UNIFIED_NONE
;
467 static int detect_unified_cgroup_hierarchy_from_image(const char *directory
) {
470 /* Let's inherit the mode to use from the host system, but let's take into consideration what systemd
471 * in the image actually supports. */
472 r
= cg_all_unified();
474 return log_error_errno(r
, "Failed to determine whether we are in all unified mode.");
476 /* Unified cgroup hierarchy support was added in 230. Unfortunately the detection
477 * routine only detects 231, so we'll have a false negative here for 230. */
478 r
= systemd_installation_has_version(directory
, 230);
480 return log_error_errno(r
, "Failed to determine systemd version in container: %m");
482 arg_unified_cgroup_hierarchy
= CGROUP_UNIFIED_ALL
;
484 arg_unified_cgroup_hierarchy
= CGROUP_UNIFIED_NONE
;
485 } else if (cg_unified_controller(SYSTEMD_CGROUP_CONTROLLER
) > 0) {
486 /* Mixed cgroup hierarchy support was added in 233 */
487 r
= systemd_installation_has_version(directory
, 233);
489 return log_error_errno(r
, "Failed to determine systemd version in container: %m");
491 arg_unified_cgroup_hierarchy
= CGROUP_UNIFIED_SYSTEMD
;
493 arg_unified_cgroup_hierarchy
= CGROUP_UNIFIED_NONE
;
495 arg_unified_cgroup_hierarchy
= CGROUP_UNIFIED_NONE
;
497 log_debug("Using %s hierarchy for container.",
498 arg_unified_cgroup_hierarchy
== CGROUP_UNIFIED_NONE
? "legacy" :
499 arg_unified_cgroup_hierarchy
== CGROUP_UNIFIED_SYSTEMD
? "hybrid" : "unified");
504 static int parse_capability_spec(const char *spec
, uint64_t *ret_mask
) {
509 _cleanup_free_
char *t
= NULL
;
511 r
= extract_first_word(&spec
, &t
, ",", 0);
513 return log_error_errno(r
, "Failed to parse capability %s.", t
);
517 if (streq(t
, "help")) {
518 for (int i
= 0; i
< capability_list_length(); i
++) {
521 name
= capability_to_name(i
);
530 mask
= (uint64_t) -1;
532 r
= capability_from_name(t
);
534 return log_error_errno(r
, "Failed to parse capability %s.", t
);
541 return 1; /* continue */
544 static int parse_share_ns_env(const char *name
, unsigned long ns_flag
) {
547 r
= getenv_bool(name
);
551 return log_error_errno(r
, "Failed to parse $%s: %m", name
);
553 arg_clone_ns_flags
= (arg_clone_ns_flags
& ~ns_flag
) | (r
> 0 ? 0 : ns_flag
);
554 arg_settings_mask
|= SETTING_CLONE_NS_FLAGS
;
558 static int parse_mount_settings_env(void) {
562 r
= getenv_bool("SYSTEMD_NSPAWN_TMPFS_TMP");
563 if (r
< 0 && r
!= -ENXIO
)
564 return log_error_errno(r
, "Failed to parse $SYSTEMD_NSPAWN_TMPFS_TMP: %m");
566 SET_FLAG(arg_mount_settings
, MOUNT_APPLY_TMPFS_TMP
, r
> 0);
568 e
= getenv("SYSTEMD_NSPAWN_API_VFS_WRITABLE");
569 if (streq_ptr(e
, "network"))
570 arg_mount_settings
|= MOUNT_APPLY_APIVFS_RO
|MOUNT_APPLY_APIVFS_NETNS
;
573 r
= parse_boolean(e
);
575 return log_error_errno(r
, "Failed to parse $SYSTEMD_NSPAWN_API_VFS_WRITABLE: %m");
577 SET_FLAG(arg_mount_settings
, MOUNT_APPLY_APIVFS_RO
, r
== 0);
578 SET_FLAG(arg_mount_settings
, MOUNT_APPLY_APIVFS_NETNS
, false);
584 static int parse_environment(void) {
588 r
= parse_share_ns_env("SYSTEMD_NSPAWN_SHARE_NS_IPC", CLONE_NEWIPC
);
591 r
= parse_share_ns_env("SYSTEMD_NSPAWN_SHARE_NS_PID", CLONE_NEWPID
);
594 r
= parse_share_ns_env("SYSTEMD_NSPAWN_SHARE_NS_UTS", CLONE_NEWUTS
);
597 r
= parse_share_ns_env("SYSTEMD_NSPAWN_SHARE_SYSTEM", CLONE_NEWIPC
|CLONE_NEWPID
|CLONE_NEWUTS
);
601 r
= parse_mount_settings_env();
605 /* SYSTEMD_NSPAWN_USE_CGNS=0 can be used to disable CLONE_NEWCGROUP use,
606 * even if it is supported. If not supported, it has no effect. */
607 if (!cg_ns_supported())
608 arg_use_cgns
= false;
610 r
= getenv_bool("SYSTEMD_NSPAWN_USE_CGNS");
613 return log_error_errno(r
, "Failed to parse $SYSTEMD_NSPAWN_USE_CGNS: %m");
617 arg_use_cgns
= r
> 0;
618 arg_settings_mask
|= SETTING_USE_CGNS
;
622 e
= getenv("SYSTEMD_NSPAWN_CONTAINER_SERVICE");
624 arg_container_service_name
= e
;
626 return detect_unified_cgroup_hierarchy_from_environment();
629 static int parse_argv(int argc
, char *argv
[]) {
647 ARG_NETWORK_INTERFACE
,
652 ARG_NETWORK_VETH_EXTRA
,
653 ARG_NETWORK_NAMESPACE_PATH
,
663 ARG_PRIVATE_USERS_CHOWN
,
666 ARG_SYSTEM_CALL_FILTER
,
669 ARG_NO_NEW_PRIVILEGES
,
670 ARG_OOM_SCORE_ADJUST
,
682 static const struct option options
[] = {
683 { "help", no_argument
, NULL
, 'h' },
684 { "version", no_argument
, NULL
, ARG_VERSION
},
685 { "directory", required_argument
, NULL
, 'D' },
686 { "template", required_argument
, NULL
, ARG_TEMPLATE
},
687 { "ephemeral", no_argument
, NULL
, 'x' },
688 { "user", required_argument
, NULL
, 'u' },
689 { "private-network", no_argument
, NULL
, ARG_PRIVATE_NETWORK
},
690 { "as-pid2", no_argument
, NULL
, 'a' },
691 { "boot", no_argument
, NULL
, 'b' },
692 { "uuid", required_argument
, NULL
, ARG_UUID
},
693 { "read-only", no_argument
, NULL
, ARG_READ_ONLY
},
694 { "capability", required_argument
, NULL
, ARG_CAPABILITY
},
695 { "drop-capability", required_argument
, NULL
, ARG_DROP_CAPABILITY
},
696 { "no-new-privileges", required_argument
, NULL
, ARG_NO_NEW_PRIVILEGES
},
697 { "link-journal", required_argument
, NULL
, ARG_LINK_JOURNAL
},
698 { "bind", required_argument
, NULL
, ARG_BIND
},
699 { "bind-ro", required_argument
, NULL
, ARG_BIND_RO
},
700 { "tmpfs", required_argument
, NULL
, ARG_TMPFS
},
701 { "overlay", required_argument
, NULL
, ARG_OVERLAY
},
702 { "overlay-ro", required_argument
, NULL
, ARG_OVERLAY_RO
},
703 { "inaccessible", required_argument
, NULL
, ARG_INACCESSIBLE
},
704 { "machine", required_argument
, NULL
, 'M' },
705 { "hostname", required_argument
, NULL
, ARG_HOSTNAME
},
706 { "slice", required_argument
, NULL
, 'S' },
707 { "setenv", required_argument
, NULL
, 'E' },
708 { "selinux-context", required_argument
, NULL
, 'Z' },
709 { "selinux-apifs-context", required_argument
, NULL
, 'L' },
710 { "quiet", no_argument
, NULL
, 'q' },
711 { "share-system", no_argument
, NULL
, ARG_SHARE_SYSTEM
}, /* not documented */
712 { "register", required_argument
, NULL
, ARG_REGISTER
},
713 { "keep-unit", no_argument
, NULL
, ARG_KEEP_UNIT
},
714 { "network-interface", required_argument
, NULL
, ARG_NETWORK_INTERFACE
},
715 { "network-macvlan", required_argument
, NULL
, ARG_NETWORK_MACVLAN
},
716 { "network-ipvlan", required_argument
, NULL
, ARG_NETWORK_IPVLAN
},
717 { "network-veth", no_argument
, NULL
, 'n' },
718 { "network-veth-extra", required_argument
, NULL
, ARG_NETWORK_VETH_EXTRA
},
719 { "network-bridge", required_argument
, NULL
, ARG_NETWORK_BRIDGE
},
720 { "network-zone", required_argument
, NULL
, ARG_NETWORK_ZONE
},
721 { "network-namespace-path", required_argument
, NULL
, ARG_NETWORK_NAMESPACE_PATH
},
722 { "personality", required_argument
, NULL
, ARG_PERSONALITY
},
723 { "image", required_argument
, NULL
, 'i' },
724 { "volatile", optional_argument
, NULL
, ARG_VOLATILE
},
725 { "port", required_argument
, NULL
, 'p' },
726 { "property", required_argument
, NULL
, ARG_PROPERTY
},
727 { "private-users", optional_argument
, NULL
, ARG_PRIVATE_USERS
},
728 { "private-users-chown", optional_argument
, NULL
, ARG_PRIVATE_USERS_CHOWN
},
729 { "kill-signal", required_argument
, NULL
, ARG_KILL_SIGNAL
},
730 { "settings", required_argument
, NULL
, ARG_SETTINGS
},
731 { "chdir", required_argument
, NULL
, ARG_CHDIR
},
732 { "pivot-root", required_argument
, NULL
, ARG_PIVOT_ROOT
},
733 { "notify-ready", required_argument
, NULL
, ARG_NOTIFY_READY
},
734 { "root-hash", required_argument
, NULL
, ARG_ROOT_HASH
},
735 { "system-call-filter", required_argument
, NULL
, ARG_SYSTEM_CALL_FILTER
},
736 { "rlimit", required_argument
, NULL
, ARG_RLIMIT
},
737 { "oom-score-adjust", required_argument
, NULL
, ARG_OOM_SCORE_ADJUST
},
738 { "cpu-affinity", required_argument
, NULL
, ARG_CPU_AFFINITY
},
739 { "resolv-conf", required_argument
, NULL
, ARG_RESOLV_CONF
},
740 { "timezone", required_argument
, NULL
, ARG_TIMEZONE
},
741 { "console", required_argument
, NULL
, ARG_CONSOLE
},
742 { "pipe", no_argument
, NULL
, ARG_PIPE
},
743 { "oci-bundle", required_argument
, NULL
, ARG_OCI_BUNDLE
},
744 { "no-pager", no_argument
, NULL
, ARG_NO_PAGER
},
745 { "verity-data", required_argument
, NULL
, ARG_VERITY_DATA
},
746 { "root-hash-sig", required_argument
, NULL
, ARG_ROOT_HASH_SIG
},
751 uint64_t plus
= 0, minus
= 0;
752 bool mask_all_settings
= false, mask_no_settings
= false;
757 while ((c
= getopt_long(argc
, argv
, "+hD:u:abL:M:jS:Z:qi:xp:nUE:P", options
, NULL
)) >= 0)
767 r
= parse_path_argument_and_warn(optarg
, false, &arg_directory
);
771 arg_settings_mask
|= SETTING_DIRECTORY
;
775 r
= parse_path_argument_and_warn(optarg
, false, &arg_template
);
779 arg_settings_mask
|= SETTING_DIRECTORY
;
783 r
= parse_path_argument_and_warn(optarg
, false, &arg_image
);
787 arg_settings_mask
|= SETTING_DIRECTORY
;
791 r
= parse_path_argument_and_warn(optarg
, false, &arg_oci_bundle
);
798 arg_ephemeral
= true;
799 arg_settings_mask
|= SETTING_EPHEMERAL
;
803 r
= free_and_strdup(&arg_user
, optarg
);
807 arg_settings_mask
|= SETTING_USER
;
810 case ARG_NETWORK_ZONE
: {
813 j
= strjoin("vz-", optarg
);
817 if (!ifname_valid(j
)) {
818 log_error("Network zone name not valid: %s", j
);
823 free_and_replace(arg_network_zone
, j
);
825 arg_network_veth
= true;
826 arg_private_network
= true;
827 arg_settings_mask
|= SETTING_NETWORK
;
831 case ARG_NETWORK_BRIDGE
:
833 if (!ifname_valid(optarg
))
834 return log_error_errno(SYNTHETIC_ERRNO(EINVAL
),
835 "Bridge interface name not valid: %s", optarg
);
837 r
= free_and_strdup(&arg_network_bridge
, optarg
);
843 arg_network_veth
= true;
844 arg_private_network
= true;
845 arg_settings_mask
|= SETTING_NETWORK
;
848 case ARG_NETWORK_VETH_EXTRA
:
849 r
= veth_extra_parse(&arg_network_veth_extra
, optarg
);
851 return log_error_errno(r
, "Failed to parse --network-veth-extra= parameter: %s", optarg
);
853 arg_private_network
= true;
854 arg_settings_mask
|= SETTING_NETWORK
;
857 case ARG_NETWORK_INTERFACE
:
858 if (!ifname_valid(optarg
))
859 return log_error_errno(SYNTHETIC_ERRNO(EINVAL
),
860 "Network interface name not valid: %s", optarg
);
862 r
= test_network_interface_initialized(optarg
);
866 if (strv_extend(&arg_network_interfaces
, optarg
) < 0)
869 arg_private_network
= true;
870 arg_settings_mask
|= SETTING_NETWORK
;
873 case ARG_NETWORK_MACVLAN
:
875 if (!ifname_valid(optarg
))
876 return log_error_errno(SYNTHETIC_ERRNO(EINVAL
),
877 "MACVLAN network interface name not valid: %s", optarg
);
879 r
= test_network_interface_initialized(optarg
);
883 if (strv_extend(&arg_network_macvlan
, optarg
) < 0)
886 arg_private_network
= true;
887 arg_settings_mask
|= SETTING_NETWORK
;
890 case ARG_NETWORK_IPVLAN
:
892 if (!ifname_valid(optarg
))
893 return log_error_errno(SYNTHETIC_ERRNO(EINVAL
),
894 "IPVLAN network interface name not valid: %s", optarg
);
896 r
= test_network_interface_initialized(optarg
);
900 if (strv_extend(&arg_network_ipvlan
, optarg
) < 0)
904 case ARG_PRIVATE_NETWORK
:
905 arg_private_network
= true;
906 arg_settings_mask
|= SETTING_NETWORK
;
909 case ARG_NETWORK_NAMESPACE_PATH
:
910 r
= parse_path_argument_and_warn(optarg
, false, &arg_network_namespace_path
);
914 arg_settings_mask
|= SETTING_NETWORK
;
918 if (arg_start_mode
== START_PID2
)
919 return log_error_errno(SYNTHETIC_ERRNO(EINVAL
),
920 "--boot and --as-pid2 may not be combined.");
922 arg_start_mode
= START_BOOT
;
923 arg_settings_mask
|= SETTING_START_MODE
;
927 if (arg_start_mode
== START_BOOT
)
928 return log_error_errno(SYNTHETIC_ERRNO(EINVAL
),
929 "--boot and --as-pid2 may not be combined.");
931 arg_start_mode
= START_PID2
;
932 arg_settings_mask
|= SETTING_START_MODE
;
936 r
= sd_id128_from_string(optarg
, &arg_uuid
);
938 return log_error_errno(r
, "Invalid UUID: %s", optarg
);
940 if (sd_id128_is_null(arg_uuid
))
941 return log_error_errno(SYNTHETIC_ERRNO(EINVAL
),
942 "Machine UUID may not be all zeroes.");
944 arg_settings_mask
|= SETTING_MACHINE_ID
;
948 _cleanup_free_
char *mangled
= NULL
;
950 r
= unit_name_mangle_with_suffix(optarg
, NULL
, UNIT_NAME_MANGLE_WARN
, ".slice", &mangled
);
954 free_and_replace(arg_slice
, mangled
);
955 arg_settings_mask
|= SETTING_SLICE
;
961 arg_machine
= mfree(arg_machine
);
963 if (!machine_name_is_valid(optarg
))
964 return log_error_errno(SYNTHETIC_ERRNO(EINVAL
),
965 "Invalid machine name: %s", optarg
);
967 r
= free_and_strdup(&arg_machine
, optarg
);
975 arg_hostname
= mfree(arg_hostname
);
977 if (!hostname_is_valid(optarg
, false))
978 return log_error_errno(SYNTHETIC_ERRNO(EINVAL
),
979 "Invalid hostname: %s", optarg
);
981 r
= free_and_strdup(&arg_hostname
, optarg
);
986 arg_settings_mask
|= SETTING_HOSTNAME
;
990 arg_selinux_context
= optarg
;
994 arg_selinux_apifs_context
= optarg
;
998 arg_read_only
= true;
999 arg_settings_mask
|= SETTING_READ_ONLY
;
1002 case ARG_CAPABILITY
:
1003 case ARG_DROP_CAPABILITY
: {
1005 r
= parse_capability_spec(optarg
, &m
);
1009 if (c
== ARG_CAPABILITY
)
1013 arg_settings_mask
|= SETTING_CAPABILITY
;
1016 case ARG_NO_NEW_PRIVILEGES
:
1017 r
= parse_boolean(optarg
);
1019 return log_error_errno(r
, "Failed to parse --no-new-privileges= argument: %s", optarg
);
1021 arg_no_new_privileges
= r
;
1022 arg_settings_mask
|= SETTING_NO_NEW_PRIVILEGES
;
1026 arg_link_journal
= LINK_GUEST
;
1027 arg_link_journal_try
= true;
1028 arg_settings_mask
|= SETTING_LINK_JOURNAL
;
1031 case ARG_LINK_JOURNAL
:
1032 r
= parse_link_journal(optarg
, &arg_link_journal
, &arg_link_journal_try
);
1034 return log_error_errno(r
, "Failed to parse link journal mode %s", optarg
);
1036 arg_settings_mask
|= SETTING_LINK_JOURNAL
;
1041 r
= bind_mount_parse(&arg_custom_mounts
, &arg_n_custom_mounts
, optarg
, c
== ARG_BIND_RO
);
1043 return log_error_errno(r
, "Failed to parse --bind(-ro)= argument %s: %m", optarg
);
1045 arg_settings_mask
|= SETTING_CUSTOM_MOUNTS
;
1049 r
= tmpfs_mount_parse(&arg_custom_mounts
, &arg_n_custom_mounts
, optarg
);
1051 return log_error_errno(r
, "Failed to parse --tmpfs= argument %s: %m", optarg
);
1053 arg_settings_mask
|= SETTING_CUSTOM_MOUNTS
;
1057 case ARG_OVERLAY_RO
:
1058 r
= overlay_mount_parse(&arg_custom_mounts
, &arg_n_custom_mounts
, optarg
, c
== ARG_OVERLAY_RO
);
1059 if (r
== -EADDRNOTAVAIL
)
1060 return log_error_errno(r
, "--overlay(-ro)= needs at least two colon-separated directories specified.");
1062 return log_error_errno(r
, "Failed to parse --overlay(-ro)= argument %s: %m", optarg
);
1064 arg_settings_mask
|= SETTING_CUSTOM_MOUNTS
;
1067 case ARG_INACCESSIBLE
:
1068 r
= inaccessible_mount_parse(&arg_custom_mounts
, &arg_n_custom_mounts
, optarg
);
1070 return log_error_errno(r
, "Failed to parse --inaccessible= argument %s: %m", optarg
);
1072 arg_settings_mask
|= SETTING_CUSTOM_MOUNTS
;
1078 if (!env_assignment_is_valid(optarg
))
1079 return log_error_errno(SYNTHETIC_ERRNO(EINVAL
),
1080 "Environment variable assignment '%s' is not valid.", optarg
);
1082 n
= strv_env_set(arg_setenv
, optarg
);
1086 strv_free_and_replace(arg_setenv
, n
);
1087 arg_settings_mask
|= SETTING_ENVIRONMENT
;
1095 case ARG_SHARE_SYSTEM
:
1096 /* We don't officially support this anymore, except for compat reasons. People should use the
1097 * $SYSTEMD_NSPAWN_SHARE_* environment variables instead. */
1098 log_warning("Please do not use --share-system anymore, use $SYSTEMD_NSPAWN_SHARE_* instead.");
1099 arg_clone_ns_flags
= 0;
1103 r
= parse_boolean(optarg
);
1105 log_error("Failed to parse --register= argument: %s", optarg
);
1113 arg_keep_unit
= true;
1116 case ARG_PERSONALITY
:
1118 arg_personality
= personality_from_string(optarg
);
1119 if (arg_personality
== PERSONALITY_INVALID
)
1120 return log_error_errno(SYNTHETIC_ERRNO(EINVAL
),
1121 "Unknown or unsupported personality '%s'.", optarg
);
1123 arg_settings_mask
|= SETTING_PERSONALITY
;
1129 arg_volatile_mode
= VOLATILE_YES
;
1130 else if (streq(optarg
, "help")) {
1131 DUMP_STRING_TABLE(volatile_mode
, VolatileMode
, _VOLATILE_MODE_MAX
);
1136 m
= volatile_mode_from_string(optarg
);
1138 return log_error_errno(SYNTHETIC_ERRNO(EINVAL
),
1139 "Failed to parse --volatile= argument: %s", optarg
);
1141 arg_volatile_mode
= m
;
1144 arg_settings_mask
|= SETTING_VOLATILE_MODE
;
1148 r
= expose_port_parse(&arg_expose_ports
, optarg
);
1150 return log_error_errno(r
, "Duplicate port specification: %s", optarg
);
1152 return log_error_errno(r
, "Failed to parse host port %s: %m", optarg
);
1154 arg_settings_mask
|= SETTING_EXPOSE_PORTS
;
1158 if (strv_extend(&arg_property
, optarg
) < 0)
1163 case ARG_PRIVATE_USERS
: {
1168 else if (!in_charset(optarg
, DIGITS
))
1169 /* do *not* parse numbers as booleans */
1170 boolean
= parse_boolean(optarg
);
1172 if (boolean
== false) {
1173 /* no: User namespacing off */
1174 arg_userns_mode
= USER_NAMESPACE_NO
;
1175 arg_uid_shift
= UID_INVALID
;
1176 arg_uid_range
= UINT32_C(0x10000);
1177 } else if (boolean
== true) {
1178 /* yes: User namespacing on, UID range is read from root dir */
1179 arg_userns_mode
= USER_NAMESPACE_FIXED
;
1180 arg_uid_shift
= UID_INVALID
;
1181 arg_uid_range
= UINT32_C(0x10000);
1182 } else if (streq(optarg
, "pick")) {
1183 /* pick: User namespacing on, UID range is picked randomly */
1184 arg_userns_mode
= USER_NAMESPACE_PICK
;
1185 arg_uid_shift
= UID_INVALID
;
1186 arg_uid_range
= UINT32_C(0x10000);
1188 _cleanup_free_
char *buffer
= NULL
;
1189 const char *range
, *shift
;
1191 /* anything else: User namespacing on, UID range is explicitly configured */
1193 range
= strchr(optarg
, ':');
1195 buffer
= strndup(optarg
, range
- optarg
);
1201 r
= safe_atou32(range
, &arg_uid_range
);
1203 return log_error_errno(r
, "Failed to parse UID range \"%s\": %m", range
);
1207 r
= parse_uid(shift
, &arg_uid_shift
);
1209 return log_error_errno(r
, "Failed to parse UID \"%s\": %m", optarg
);
1211 arg_userns_mode
= USER_NAMESPACE_FIXED
;
1214 if (arg_uid_range
<= 0)
1215 return log_error_errno(SYNTHETIC_ERRNO(EINVAL
),
1216 "UID range cannot be 0.");
1218 arg_settings_mask
|= SETTING_USERNS
;
1223 if (userns_supported()) {
1224 arg_userns_mode
= USER_NAMESPACE_PICK
;
1225 arg_uid_shift
= UID_INVALID
;
1226 arg_uid_range
= UINT32_C(0x10000);
1228 arg_settings_mask
|= SETTING_USERNS
;
1233 case ARG_PRIVATE_USERS_CHOWN
:
1234 arg_userns_chown
= true;
1236 arg_settings_mask
|= SETTING_USERNS
;
1239 case ARG_KILL_SIGNAL
:
1240 if (streq(optarg
, "help")) {
1241 DUMP_STRING_TABLE(signal
, int, _NSIG
);
1245 arg_kill_signal
= signal_from_string(optarg
);
1246 if (arg_kill_signal
< 0)
1247 return log_error_errno(SYNTHETIC_ERRNO(EINVAL
),
1248 "Cannot parse signal: %s", optarg
);
1250 arg_settings_mask
|= SETTING_KILL_SIGNAL
;
1255 /* no → do not read files
1256 * yes → read files, do not override cmdline, trust only subset
1257 * override → read files, override cmdline, trust only subset
1258 * trusted → read files, do not override cmdline, trust all
1261 r
= parse_boolean(optarg
);
1263 if (streq(optarg
, "trusted")) {
1264 mask_all_settings
= false;
1265 mask_no_settings
= false;
1266 arg_settings_trusted
= true;
1268 } else if (streq(optarg
, "override")) {
1269 mask_all_settings
= false;
1270 mask_no_settings
= true;
1271 arg_settings_trusted
= -1;
1273 return log_error_errno(r
, "Failed to parse --settings= argument: %s", optarg
);
1276 mask_all_settings
= false;
1277 mask_no_settings
= false;
1278 arg_settings_trusted
= -1;
1281 mask_all_settings
= true;
1282 mask_no_settings
= false;
1283 arg_settings_trusted
= false;
1289 if (!path_is_absolute(optarg
))
1290 return log_error_errno(SYNTHETIC_ERRNO(EINVAL
),
1291 "Working directory %s is not an absolute path.", optarg
);
1293 r
= free_and_strdup(&arg_chdir
, optarg
);
1297 arg_settings_mask
|= SETTING_WORKING_DIRECTORY
;
1300 case ARG_PIVOT_ROOT
:
1301 r
= pivot_root_parse(&arg_pivot_root_new
, &arg_pivot_root_old
, optarg
);
1303 return log_error_errno(r
, "Failed to parse --pivot-root= argument %s: %m", optarg
);
1305 arg_settings_mask
|= SETTING_PIVOT_ROOT
;
1308 case ARG_NOTIFY_READY
:
1309 r
= parse_boolean(optarg
);
1311 return log_error_errno(SYNTHETIC_ERRNO(EINVAL
),
1312 "%s is not a valid notify mode. Valid modes are: yes, no, and ready.", optarg
);
1313 arg_notify_ready
= r
;
1314 arg_settings_mask
|= SETTING_NOTIFY_READY
;
1317 case ARG_ROOT_HASH
: {
1321 r
= unhexmem(optarg
, strlen(optarg
), &k
, &l
);
1323 return log_error_errno(r
, "Failed to parse root hash: %s", optarg
);
1324 if (l
< sizeof(sd_id128_t
)) {
1326 return log_error_errno(SYNTHETIC_ERRNO(EINVAL
), "Root hash must be at least 128bit long: %s", optarg
);
1329 free(arg_root_hash
);
1331 arg_root_hash_size
= l
;
1335 case ARG_VERITY_DATA
:
1336 r
= parse_path_argument_and_warn(optarg
, false, &arg_verity_data
);
1341 case ARG_ROOT_HASH_SIG
: {
1344 if ((value
= startswith(optarg
, "base64:"))) {
1348 r
= unbase64mem(value
, strlen(value
), &p
, &l
);
1350 return log_error_errno(r
, "Failed to parse root hash signature '%s': %m", optarg
);
1352 free_and_replace(arg_root_hash_sig
, p
);
1353 arg_root_hash_sig_size
= l
;
1354 arg_root_hash_sig_path
= mfree(arg_root_hash_sig_path
);
1356 r
= parse_path_argument_and_warn(optarg
, false, &arg_root_hash_sig_path
);
1359 arg_root_hash_sig
= mfree(arg_root_hash_sig
);
1360 arg_root_hash_sig_size
= 0;
1366 case ARG_SYSTEM_CALL_FILTER
: {
1370 negative
= optarg
[0] == '~';
1371 items
= negative
? optarg
+ 1 : optarg
;
1374 _cleanup_free_
char *word
= NULL
;
1376 r
= extract_first_word(&items
, &word
, NULL
, 0);
1382 return log_error_errno(r
, "Failed to parse system call filter: %m");
1385 r
= strv_extend(&arg_syscall_deny_list
, word
);
1387 r
= strv_extend(&arg_syscall_allow_list
, word
);
1392 arg_settings_mask
|= SETTING_SYSCALL_FILTER
;
1398 _cleanup_free_
char *name
= NULL
;
1401 if (streq(optarg
, "help")) {
1402 DUMP_STRING_TABLE(rlimit
, int, _RLIMIT_MAX
);
1406 eq
= strchr(optarg
, '=');
1408 return log_error_errno(SYNTHETIC_ERRNO(EINVAL
),
1409 "--rlimit= expects an '=' assignment.");
1411 name
= strndup(optarg
, eq
- optarg
);
1415 rl
= rlimit_from_string_harder(name
);
1417 return log_error_errno(SYNTHETIC_ERRNO(EINVAL
),
1418 "Unknown resource limit: %s", name
);
1420 if (!arg_rlimit
[rl
]) {
1421 arg_rlimit
[rl
] = new0(struct rlimit
, 1);
1422 if (!arg_rlimit
[rl
])
1426 r
= rlimit_parse(rl
, eq
+ 1, arg_rlimit
[rl
]);
1428 return log_error_errno(r
, "Failed to parse resource limit: %s", eq
+ 1);
1430 arg_settings_mask
|= SETTING_RLIMIT_FIRST
<< rl
;
1434 case ARG_OOM_SCORE_ADJUST
:
1435 r
= parse_oom_score_adjust(optarg
, &arg_oom_score_adjust
);
1437 return log_error_errno(r
, "Failed to parse --oom-score-adjust= parameter: %s", optarg
);
1439 arg_oom_score_adjust_set
= true;
1440 arg_settings_mask
|= SETTING_OOM_SCORE_ADJUST
;
1443 case ARG_CPU_AFFINITY
: {
1446 r
= parse_cpu_set(optarg
, &cpuset
);
1448 return log_error_errno(r
, "Failed to parse CPU affinity mask %s: %m", optarg
);
1450 cpu_set_reset(&arg_cpu_set
);
1451 arg_cpu_set
= cpuset
;
1452 arg_settings_mask
|= SETTING_CPU_AFFINITY
;
1456 case ARG_RESOLV_CONF
:
1457 if (streq(optarg
, "help")) {
1458 DUMP_STRING_TABLE(resolv_conf_mode
, ResolvConfMode
, _RESOLV_CONF_MODE_MAX
);
1462 arg_resolv_conf
= resolv_conf_mode_from_string(optarg
);
1463 if (arg_resolv_conf
< 0)
1464 return log_error_errno(SYNTHETIC_ERRNO(EINVAL
),
1465 "Failed to parse /etc/resolv.conf mode: %s", optarg
);
1467 arg_settings_mask
|= SETTING_RESOLV_CONF
;
1471 if (streq(optarg
, "help")) {
1472 DUMP_STRING_TABLE(timezone_mode
, TimezoneMode
, _TIMEZONE_MODE_MAX
);
1476 arg_timezone
= timezone_mode_from_string(optarg
);
1477 if (arg_timezone
< 0)
1478 return log_error_errno(SYNTHETIC_ERRNO(EINVAL
),
1479 "Failed to parse /etc/localtime mode: %s", optarg
);
1481 arg_settings_mask
|= SETTING_TIMEZONE
;
1485 r
= handle_arg_console(optarg
);
1492 r
= handle_arg_console("pipe");
1498 arg_pager_flags
|= PAGER_DISABLE
;
1505 assert_not_reached("Unhandled option");
1508 if (argc
> optind
) {
1509 strv_free(arg_parameters
);
1510 arg_parameters
= strv_copy(argv
+ optind
);
1511 if (!arg_parameters
)
1514 arg_settings_mask
|= SETTING_START_MODE
;
1517 if (arg_ephemeral
&& arg_template
&& !arg_directory
)
1518 /* User asked for ephemeral execution but specified --template= instead of --directory=. Semantically
1519 * such an invocation makes some sense, see https://github.com/systemd/systemd/issues/3667. Let's
1520 * accept this here, and silently make "--ephemeral --template=" equivalent to "--ephemeral
1522 arg_directory
= TAKE_PTR(arg_template
);
1524 arg_caps_retain
= (arg_caps_retain
| plus
| (arg_private_network
? UINT64_C(1) << CAP_NET_ADMIN
: 0)) & ~minus
;
1526 /* Make sure to parse environment before we reset the settings mask below */
1527 r
= parse_environment();
1531 /* Load all settings from .nspawn files */
1532 if (mask_no_settings
)
1533 arg_settings_mask
= 0;
1535 /* Don't load any settings from .nspawn files */
1536 if (mask_all_settings
)
1537 arg_settings_mask
= _SETTINGS_MASK_ALL
;
1542 static int verify_arguments(void) {
1545 if (arg_start_mode
== START_PID2
&& arg_unified_cgroup_hierarchy
== CGROUP_UNIFIED_UNKNOWN
) {
1546 /* If we are running the stub init in the container, we don't need to look at what the init
1547 * in the container supports, because we are not using it. Let's immediately pick the right
1548 * setting based on the host system configuration.
1550 * We only do this, if the user didn't use an environment variable to override the detection.
1553 r
= cg_all_unified();
1555 return log_error_errno(r
, "Failed to determine whether we are in all unified mode.");
1557 arg_unified_cgroup_hierarchy
= CGROUP_UNIFIED_ALL
;
1558 else if (cg_unified_controller(SYSTEMD_CGROUP_CONTROLLER
) > 0)
1559 arg_unified_cgroup_hierarchy
= CGROUP_UNIFIED_SYSTEMD
;
1561 arg_unified_cgroup_hierarchy
= CGROUP_UNIFIED_NONE
;
1564 if (arg_userns_mode
!= USER_NAMESPACE_NO
)
1565 arg_mount_settings
|= MOUNT_USE_USERNS
;
1567 if (arg_private_network
)
1568 arg_mount_settings
|= MOUNT_APPLY_APIVFS_NETNS
;
1570 if (!(arg_clone_ns_flags
& CLONE_NEWPID
) ||
1571 !(arg_clone_ns_flags
& CLONE_NEWUTS
)) {
1572 arg_register
= false;
1573 if (arg_start_mode
!= START_PID1
)
1574 return log_error_errno(SYNTHETIC_ERRNO(EINVAL
), "--boot cannot be used without namespacing.");
1577 if (arg_userns_mode
== USER_NAMESPACE_PICK
)
1578 arg_userns_chown
= true;
1580 if (arg_start_mode
== START_BOOT
&& arg_kill_signal
<= 0)
1581 arg_kill_signal
= SIGRTMIN
+3;
1583 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 */
1584 arg_read_only
= true;
1586 if (has_custom_root_mount(arg_custom_mounts
, arg_n_custom_mounts
))
1587 arg_read_only
= true;
1589 if (arg_keep_unit
&& arg_register
&& cg_pid_get_owner_uid(0, NULL
) >= 0)
1590 /* Save the user from accidentally registering either user-$SESSION.scope or user@.service.
1591 * The latter is not technically a user session, but we don't need to labour the point. */
1592 return log_error_errno(SYNTHETIC_ERRNO(EINVAL
), "--keep-unit --register=yes may not be used when invoked from a user session.");
1594 if (arg_directory
&& arg_image
)
1595 return log_error_errno(SYNTHETIC_ERRNO(EINVAL
), "--directory= and --image= may not be combined.");
1597 if (arg_template
&& arg_image
)
1598 return log_error_errno(SYNTHETIC_ERRNO(EINVAL
), "--template= and --image= may not be combined.");
1600 if (arg_template
&& !(arg_directory
|| arg_machine
))
1601 return log_error_errno(SYNTHETIC_ERRNO(EINVAL
), "--template= needs --directory= or --machine=.");
1603 if (arg_ephemeral
&& arg_template
)
1604 return log_error_errno(SYNTHETIC_ERRNO(EINVAL
), "--ephemeral and --template= may not be combined.");
1606 if (arg_ephemeral
&& !IN_SET(arg_link_journal
, LINK_NO
, LINK_AUTO
))
1607 return log_error_errno(SYNTHETIC_ERRNO(EINVAL
), "--ephemeral and --link-journal= may not be combined.");
1609 if (arg_userns_mode
!= USER_NAMESPACE_NO
&& !userns_supported())
1610 return log_error_errno(SYNTHETIC_ERRNO(EOPNOTSUPP
), "--private-users= is not supported, kernel compiled without user namespace support.");
1612 if (arg_userns_chown
&& arg_read_only
)
1613 return log_error_errno(SYNTHETIC_ERRNO(EINVAL
),
1614 "--read-only and --private-users-chown may not be combined.");
1616 /* We don't support --private-users-chown together with any of the volatile modes since we couldn't
1617 * change the read-only part of the tree (i.e. /usr) anyway, or because it would trigger a massive
1618 * copy-up (in case of overlay) making the entire exercise pointless. */
1619 if (arg_userns_chown
&& arg_volatile_mode
!= VOLATILE_NO
)
1620 return log_error_errno(SYNTHETIC_ERRNO(EINVAL
), "--volatile= and --private-users-chown may not be combined.");
1622 /* If --network-namespace-path is given with any other network-related option (except --private-network),
1623 * we need to error out, to avoid conflicts between different network options. */
1624 if (arg_network_namespace_path
&&
1625 (arg_network_interfaces
|| arg_network_macvlan
||
1626 arg_network_ipvlan
|| arg_network_veth_extra
||
1627 arg_network_bridge
|| arg_network_zone
||
1629 return log_error_errno(SYNTHETIC_ERRNO(EINVAL
), "--network-namespace-path= cannot be combined with other network options.");
1631 if (arg_network_bridge
&& arg_network_zone
)
1632 return log_error_errno(SYNTHETIC_ERRNO(EINVAL
),
1633 "--network-bridge= and --network-zone= may not be combined.");
1635 if (arg_userns_mode
!= USER_NAMESPACE_NO
&& (arg_mount_settings
& MOUNT_APPLY_APIVFS_NETNS
) && !arg_private_network
)
1636 return log_error_errno(SYNTHETIC_ERRNO(EINVAL
), "Invalid namespacing settings. Mounting sysfs with --private-users requires --private-network.");
1638 if (arg_userns_mode
!= USER_NAMESPACE_NO
&& !(arg_mount_settings
& MOUNT_APPLY_APIVFS_RO
))
1639 return log_error_errno(SYNTHETIC_ERRNO(EINVAL
), "Cannot combine --private-users with read-write mounts.");
1641 if (arg_expose_ports
&& !arg_private_network
)
1642 return log_error_errno(SYNTHETIC_ERRNO(EINVAL
), "Cannot use --port= without private networking.");
1645 if (arg_expose_ports
)
1646 return log_error_errno(SYNTHETIC_ERRNO(EOPNOTSUPP
), "--port= is not supported, compiled without libiptc support.");
1649 r
= custom_mount_check_all();
1656 static int userns_lchown(const char *p
, uid_t uid
, gid_t gid
) {
1659 if (arg_userns_mode
== USER_NAMESPACE_NO
)
1662 if (uid
== UID_INVALID
&& gid
== GID_INVALID
)
1665 if (uid
!= UID_INVALID
) {
1666 uid
+= arg_uid_shift
;
1668 if (uid
< arg_uid_shift
|| uid
>= arg_uid_shift
+ arg_uid_range
)
1672 if (gid
!= GID_INVALID
) {
1673 gid
+= (gid_t
) arg_uid_shift
;
1675 if (gid
< (gid_t
) arg_uid_shift
|| gid
>= (gid_t
) (arg_uid_shift
+ arg_uid_range
))
1679 if (lchown(p
, uid
, gid
) < 0)
1685 static int userns_mkdir(const char *root
, const char *path
, mode_t mode
, uid_t uid
, gid_t gid
) {
1689 q
= prefix_roota(root
, path
);
1690 r
= mkdir_errno_wrapper(q
, mode
);
1696 return userns_lchown(q
, uid
, gid
);
1699 static const char *timezone_from_path(const char *path
) {
1700 return PATH_STARTSWITH_SET(
1702 "../usr/share/zoneinfo/",
1703 "/usr/share/zoneinfo/");
1706 static bool etc_writable(void) {
1707 return !arg_read_only
|| IN_SET(arg_volatile_mode
, VOLATILE_YES
, VOLATILE_OVERLAY
);
1710 static int setup_timezone(const char *dest
) {
1711 _cleanup_free_
char *p
= NULL
, *etc
= NULL
;
1712 const char *where
, *check
;
1718 if (IN_SET(arg_timezone
, TIMEZONE_AUTO
, TIMEZONE_SYMLINK
)) {
1719 r
= readlink_malloc("/etc/localtime", &p
);
1720 if (r
== -ENOENT
&& arg_timezone
== TIMEZONE_AUTO
)
1721 m
= etc_writable() ? TIMEZONE_DELETE
: TIMEZONE_OFF
;
1722 else if (r
== -EINVAL
&& arg_timezone
== TIMEZONE_AUTO
) /* regular file? */
1723 m
= etc_writable() ? TIMEZONE_COPY
: TIMEZONE_BIND
;
1725 log_warning_errno(r
, "Failed to read host's /etc/localtime symlink, not updating container timezone: %m");
1726 /* To handle warning, delete /etc/localtime and replace it with a symbolic link to a time zone data
1730 * ln -s /usr/share/zoneinfo/UTC /etc/localtime
1733 } else if (arg_timezone
== TIMEZONE_AUTO
)
1734 m
= etc_writable() ? TIMEZONE_SYMLINK
: TIMEZONE_BIND
;
1740 if (m
== TIMEZONE_OFF
)
1743 r
= chase_symlinks("/etc", dest
, CHASE_PREFIX_ROOT
, &etc
, NULL
);
1745 log_warning_errno(r
, "Failed to resolve /etc path in container, ignoring: %m");
1749 where
= strjoina(etc
, "/localtime");
1753 case TIMEZONE_DELETE
:
1754 if (unlink(where
) < 0)
1755 log_full_errno(errno
== ENOENT
? LOG_DEBUG
: LOG_WARNING
, errno
, "Failed to remove '%s', ignoring: %m", where
);
1759 case TIMEZONE_SYMLINK
: {
1760 _cleanup_free_
char *q
= NULL
;
1761 const char *z
, *what
;
1763 z
= timezone_from_path(p
);
1765 log_warning("/etc/localtime does not point into /usr/share/zoneinfo/, not updating container timezone.");
1769 r
= readlink_malloc(where
, &q
);
1770 if (r
>= 0 && streq_ptr(timezone_from_path(q
), z
))
1771 return 0; /* Already pointing to the right place? Then do nothing .. */
1773 check
= strjoina(dest
, "/usr/share/zoneinfo/", z
);
1774 r
= chase_symlinks(check
, dest
, 0, NULL
, NULL
);
1776 log_debug_errno(r
, "Timezone %s does not exist (or is not accessible) in container, not creating symlink: %m", z
);
1778 if (unlink(where
) < 0 && errno
!= ENOENT
) {
1779 log_full_errno(IN_SET(errno
, EROFS
, EACCES
, EPERM
) ? LOG_DEBUG
: LOG_WARNING
, /* Don't complain on read-only images */
1780 errno
, "Failed to remove existing timezone info %s in container, ignoring: %m", where
);
1784 what
= strjoina("../usr/share/zoneinfo/", z
);
1785 if (symlink(what
, where
) < 0) {
1786 log_full_errno(IN_SET(errno
, EROFS
, EACCES
, EPERM
) ? LOG_DEBUG
: LOG_WARNING
,
1787 errno
, "Failed to correct timezone of container, ignoring: %m");
1797 case TIMEZONE_BIND
: {
1798 _cleanup_free_
char *resolved
= NULL
;
1801 found
= chase_symlinks(where
, dest
, CHASE_NONEXISTENT
, &resolved
, NULL
);
1803 log_warning_errno(found
, "Failed to resolve /etc/localtime path in container, ignoring: %m");
1807 if (found
== 0) /* missing? */
1808 (void) touch(resolved
);
1810 r
= mount_verbose(LOG_WARNING
, "/etc/localtime", resolved
, NULL
, MS_BIND
, NULL
);
1812 return mount_verbose(LOG_ERR
, NULL
, resolved
, NULL
, MS_BIND
|MS_REMOUNT
|MS_RDONLY
|MS_NOSUID
|MS_NODEV
, NULL
);
1818 /* If mounting failed, try to copy */
1819 r
= copy_file_atomic("/etc/localtime", where
, 0644, 0, 0, COPY_REFLINK
|COPY_REPLACE
);
1821 log_full_errno(IN_SET(r
, -EROFS
, -EACCES
, -EPERM
) ? LOG_DEBUG
: LOG_WARNING
, r
,
1822 "Failed to copy /etc/localtime to %s, ignoring: %m", where
);
1829 assert_not_reached("unexpected mode");
1832 /* Fix permissions of the symlink or file copy we just created */
1833 r
= userns_lchown(where
, 0, 0);
1835 log_warning_errno(r
, "Failed to chown /etc/localtime, ignoring: %m");
1840 static int have_resolv_conf(const char *path
) {
1843 if (access(path
, F_OK
) < 0) {
1844 if (errno
== ENOENT
)
1847 return log_debug_errno(errno
, "Failed to determine whether '%s' is available: %m", path
);
1853 static int resolved_listening(void) {
1854 _cleanup_(sd_bus_error_free
) sd_bus_error error
= SD_BUS_ERROR_NULL
;
1855 _cleanup_(sd_bus_flush_close_unrefp
) sd_bus
*bus
= NULL
;
1856 _cleanup_free_
char *dns_stub_listener_mode
= NULL
;
1859 /* Check if resolved is listening */
1861 r
= sd_bus_open_system(&bus
);
1863 return log_debug_errno(r
, "Failed to open system bus: %m");
1865 r
= bus_name_has_owner(bus
, "org.freedesktop.resolve1", NULL
);
1867 return log_debug_errno(r
, "Failed to check whether the 'org.freedesktop.resolve1' bus name is taken: %m");
1871 r
= sd_bus_get_property_string(bus
,
1872 "org.freedesktop.resolve1",
1873 "/org/freedesktop/resolve1",
1874 "org.freedesktop.resolve1.Manager",
1877 &dns_stub_listener_mode
);
1879 return log_debug_errno(r
, "Failed to query DNSStubListener property: %s", bus_error_message(&error
, r
));
1881 return STR_IN_SET(dns_stub_listener_mode
, "udp", "yes");
1884 static int setup_resolv_conf(const char *dest
) {
1885 _cleanup_free_
char *etc
= NULL
;
1886 const char *where
, *what
;
1892 if (arg_resolv_conf
== RESOLV_CONF_AUTO
) {
1893 if (arg_private_network
)
1894 m
= RESOLV_CONF_OFF
;
1895 else if (have_resolv_conf(PRIVATE_STUB_RESOLV_CONF
) > 0 && resolved_listening() > 0)
1896 m
= etc_writable() ? RESOLV_CONF_COPY_STUB
: RESOLV_CONF_BIND_STUB
;
1897 else if (have_resolv_conf("/etc/resolv.conf") > 0)
1898 m
= etc_writable() ? RESOLV_CONF_COPY_HOST
: RESOLV_CONF_BIND_HOST
;
1900 m
= etc_writable() ? RESOLV_CONF_DELETE
: RESOLV_CONF_OFF
;
1903 m
= arg_resolv_conf
;
1905 if (m
== RESOLV_CONF_OFF
)
1908 r
= chase_symlinks("/etc", dest
, CHASE_PREFIX_ROOT
, &etc
, NULL
);
1910 log_warning_errno(r
, "Failed to resolve /etc path in container, ignoring: %m");
1914 where
= strjoina(etc
, "/resolv.conf");
1916 if (m
== RESOLV_CONF_DELETE
) {
1917 if (unlink(where
) < 0)
1918 log_full_errno(errno
== ENOENT
? LOG_DEBUG
: LOG_WARNING
, errno
, "Failed to remove '%s', ignoring: %m", where
);
1923 if (IN_SET(m
, RESOLV_CONF_BIND_STATIC
, RESOLV_CONF_REPLACE_STATIC
, RESOLV_CONF_COPY_STATIC
))
1924 what
= PRIVATE_STATIC_RESOLV_CONF
;
1925 else if (IN_SET(m
, RESOLV_CONF_BIND_UPLINK
, RESOLV_CONF_REPLACE_UPLINK
, RESOLV_CONF_COPY_UPLINK
))
1926 what
= PRIVATE_UPLINK_RESOLV_CONF
;
1927 else if (IN_SET(m
, RESOLV_CONF_BIND_STUB
, RESOLV_CONF_REPLACE_STUB
, RESOLV_CONF_COPY_STUB
))
1928 what
= PRIVATE_STUB_RESOLV_CONF
;
1930 what
= "/etc/resolv.conf";
1932 if (IN_SET(m
, RESOLV_CONF_BIND_HOST
, RESOLV_CONF_BIND_STATIC
, RESOLV_CONF_BIND_UPLINK
, RESOLV_CONF_BIND_STUB
)) {
1933 _cleanup_free_
char *resolved
= NULL
;
1936 found
= chase_symlinks(where
, dest
, CHASE_NONEXISTENT
, &resolved
, NULL
);
1938 log_warning_errno(found
, "Failed to resolve /etc/resolv.conf path in container, ignoring: %m");
1942 if (found
== 0) /* missing? */
1943 (void) touch(resolved
);
1945 r
= mount_verbose(LOG_WARNING
, what
, resolved
, NULL
, MS_BIND
, NULL
);
1947 return mount_verbose(LOG_ERR
, NULL
, resolved
, NULL
, MS_BIND
|MS_REMOUNT
|MS_RDONLY
|MS_NOSUID
|MS_NODEV
, NULL
);
1949 /* If that didn't work, let's copy the file */
1952 if (IN_SET(m
, RESOLV_CONF_REPLACE_HOST
, RESOLV_CONF_REPLACE_STATIC
, RESOLV_CONF_REPLACE_UPLINK
, RESOLV_CONF_REPLACE_STUB
))
1953 r
= copy_file_atomic(what
, where
, 0644, 0, 0, COPY_REFLINK
|COPY_REPLACE
);
1955 r
= copy_file(what
, where
, O_TRUNC
|O_NOFOLLOW
, 0644, 0, 0, COPY_REFLINK
);
1957 /* If the file already exists as symlink, let's suppress the warning, under the assumption that
1958 * resolved or something similar runs inside and the symlink points there.
1960 * If the disk image is read-only, there's also no point in complaining.
1962 log_full_errno(!IN_SET(RESOLV_CONF_COPY_HOST
, RESOLV_CONF_COPY_STATIC
, RESOLV_CONF_COPY_UPLINK
, RESOLV_CONF_COPY_STUB
) &&
1963 IN_SET(r
, -ELOOP
, -EROFS
, -EACCES
, -EPERM
) ? LOG_DEBUG
: LOG_WARNING
, r
,
1964 "Failed to copy /etc/resolv.conf to %s, ignoring: %m", where
);
1968 r
= userns_lchown(where
, 0, 0);
1970 log_warning_errno(r
, "Failed to chown /etc/resolv.conf, ignoring: %m");
1975 static int setup_boot_id(void) {
1976 _cleanup_(unlink_and_freep
) char *from
= NULL
;
1977 _cleanup_free_
char *path
= NULL
;
1978 sd_id128_t rnd
= SD_ID128_NULL
;
1982 /* Generate a new randomized boot ID, so that each boot-up of the container gets a new one */
1984 r
= tempfn_random_child("/run", "proc-sys-kernel-random-boot-id", &path
);
1986 return log_error_errno(r
, "Failed to generate random boot ID path: %m");
1988 r
= sd_id128_randomize(&rnd
);
1990 return log_error_errno(r
, "Failed to generate random boot id: %m");
1992 r
= id128_write(path
, ID128_UUID
, rnd
, false);
1994 return log_error_errno(r
, "Failed to write boot id: %m");
1996 from
= TAKE_PTR(path
);
1997 to
= "/proc/sys/kernel/random/boot_id";
1999 r
= mount_verbose(LOG_ERR
, from
, to
, NULL
, MS_BIND
, NULL
);
2003 return mount_verbose(LOG_ERR
, NULL
, to
, NULL
, MS_BIND
|MS_REMOUNT
|MS_RDONLY
|MS_NOSUID
|MS_NOEXEC
|MS_NODEV
, NULL
);
2006 static int copy_devnodes(const char *dest
) {
2007 static const char devnodes
[] =
2016 _cleanup_umask_ mode_t u
;
2024 /* Create /dev/net, so that we can create /dev/net/tun in it */
2025 if (userns_mkdir(dest
, "/dev/net", 0755, 0, 0) < 0)
2026 return log_error_errno(r
, "Failed to create /dev/net directory: %m");
2028 NULSTR_FOREACH(d
, devnodes
) {
2029 _cleanup_free_
char *from
= NULL
, *to
= NULL
;
2032 from
= path_join("/dev/", d
);
2036 to
= path_join(dest
, from
);
2040 if (stat(from
, &st
) < 0) {
2042 if (errno
!= ENOENT
)
2043 return log_error_errno(errno
, "Failed to stat %s: %m", from
);
2045 } else if (!S_ISCHR(st
.st_mode
) && !S_ISBLK(st
.st_mode
))
2046 return log_error_errno(SYNTHETIC_ERRNO(EIO
),
2047 "%s is not a char or block device, cannot copy.", from
);
2049 _cleanup_free_
char *sl
= NULL
, *prefixed
= NULL
, *dn
= NULL
, *t
= NULL
;
2051 if (mknod(to
, st
.st_mode
, st
.st_rdev
) < 0) {
2052 /* Explicitly warn the user when /dev is already populated. */
2053 if (errno
== EEXIST
)
2054 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
);
2056 return log_error_errno(errno
, "mknod(%s) failed: %m", to
);
2058 /* Some systems abusively restrict mknod but allow bind mounts. */
2061 return log_error_errno(r
, "touch (%s) failed: %m", to
);
2062 r
= mount_verbose(LOG_DEBUG
, from
, to
, NULL
, MS_BIND
, NULL
);
2064 return log_error_errno(r
, "Both mknod and bind mount (%s) failed: %m", to
);
2067 r
= userns_lchown(to
, 0, 0);
2069 return log_error_errno(r
, "chown() of device node %s failed: %m", to
);
2071 dn
= path_join("/dev", S_ISCHR(st
.st_mode
) ? "char" : "block");
2075 r
= userns_mkdir(dest
, dn
, 0755, 0, 0);
2077 return log_error_errno(r
, "Failed to create '%s': %m", dn
);
2079 if (asprintf(&sl
, "%s/%u:%u", dn
, major(st
.st_rdev
), minor(st
.st_rdev
)) < 0)
2082 prefixed
= path_join(dest
, sl
);
2086 t
= path_join("..", d
);
2090 if (symlink(t
, prefixed
) < 0)
2091 log_debug_errno(errno
, "Failed to symlink '%s' to '%s': %m", t
, prefixed
);
2098 static int make_extra_nodes(const char *dest
) {
2099 _cleanup_umask_ mode_t u
;
2105 for (i
= 0; i
< arg_n_extra_nodes
; i
++) {
2106 _cleanup_free_
char *path
= NULL
;
2107 DeviceNode
*n
= arg_extra_nodes
+ i
;
2109 path
= path_join(dest
, n
->path
);
2113 if (mknod(path
, n
->mode
, S_ISCHR(n
->mode
) || S_ISBLK(n
->mode
) ? makedev(n
->major
, n
->minor
) : 0) < 0)
2114 return log_error_errno(errno
, "Failed to create device node '%s': %m", path
);
2116 r
= chmod_and_chown(path
, n
->mode
, n
->uid
, n
->gid
);
2118 return log_error_errno(r
, "Failed to adjust device node ownership of '%s': %m", path
);
2124 static int setup_pts(const char *dest
) {
2125 _cleanup_free_
char *options
= NULL
;
2130 if (arg_selinux_apifs_context
)
2131 (void) asprintf(&options
,
2132 "newinstance,ptmxmode=0666,mode=620,gid=" GID_FMT
",context=\"%s\"",
2133 arg_uid_shift
+ TTY_GID
,
2134 arg_selinux_apifs_context
);
2137 (void) asprintf(&options
,
2138 "newinstance,ptmxmode=0666,mode=620,gid=" GID_FMT
,
2139 arg_uid_shift
+ TTY_GID
);
2144 /* Mount /dev/pts itself */
2145 p
= prefix_roota(dest
, "/dev/pts");
2146 r
= mkdir_errno_wrapper(p
, 0755);
2148 return log_error_errno(r
, "Failed to create /dev/pts: %m");
2150 r
= mount_verbose(LOG_ERR
, "devpts", p
, "devpts", MS_NOSUID
|MS_NOEXEC
, options
);
2153 r
= userns_lchown(p
, 0, 0);
2155 return log_error_errno(r
, "Failed to chown /dev/pts: %m");
2157 /* Create /dev/ptmx symlink */
2158 p
= prefix_roota(dest
, "/dev/ptmx");
2159 if (symlink("pts/ptmx", p
) < 0)
2160 return log_error_errno(errno
, "Failed to create /dev/ptmx symlink: %m");
2161 r
= userns_lchown(p
, 0, 0);
2163 return log_error_errno(r
, "Failed to chown /dev/ptmx: %m");
2165 /* And fix /dev/pts/ptmx ownership */
2166 p
= prefix_roota(dest
, "/dev/pts/ptmx");
2167 r
= userns_lchown(p
, 0, 0);
2169 return log_error_errno(r
, "Failed to chown /dev/pts/ptmx: %m");
2174 static int setup_stdio_as_dev_console(void) {
2178 terminal
= open_terminal("/dev/console", O_RDWR
);
2180 return log_error_errno(terminal
, "Failed to open console: %m");
2182 /* Make sure we can continue logging to the original stderr, even if
2183 * stderr points elsewhere now */
2184 r
= log_dup_console();
2186 return log_error_errno(r
, "Failed to duplicate stderr: %m");
2188 /* invalidates 'terminal' on success and failure */
2189 r
= rearrange_stdio(terminal
, terminal
, terminal
);
2191 return log_error_errno(r
, "Failed to move console to stdin/stdout/stderr: %m");
2196 static int setup_dev_console(const char *console
) {
2197 _cleanup_free_
char *p
= NULL
;
2200 /* Create /dev/console symlink */
2201 r
= path_make_relative("/dev", console
, &p
);
2203 return log_error_errno(r
, "Failed to create relative path: %m");
2205 if (symlink(p
, "/dev/console") < 0)
2206 return log_error_errno(errno
, "Failed to create /dev/console symlink: %m");
2211 static int setup_keyring(void) {
2212 key_serial_t keyring
;
2214 /* Allocate a new session keyring for the container. This makes sure the keyring of the session
2215 * systemd-nspawn was invoked from doesn't leak into the container. Note that by default we block
2216 * keyctl() and request_key() anyway via seccomp so doing this operation isn't strictly necessary,
2217 * but in case people explicitly allow-list these system calls let's make sure we don't leak anything
2218 * into the container. */
2220 keyring
= keyctl(KEYCTL_JOIN_SESSION_KEYRING
, 0, 0, 0, 0);
2221 if (keyring
== -1) {
2222 if (errno
== ENOSYS
)
2223 log_debug_errno(errno
, "Kernel keyring not supported, ignoring.");
2224 else if (IN_SET(errno
, EACCES
, EPERM
))
2225 log_debug_errno(errno
, "Kernel keyring access prohibited, ignoring.");
2227 return log_error_errno(errno
, "Setting up kernel keyring failed: %m");
2233 static int setup_kmsg(int kmsg_socket
) {
2234 _cleanup_(unlink_and_freep
) char *from
= NULL
;
2235 _cleanup_free_
char *fifo
= NULL
;
2236 _cleanup_close_
int fd
= -1;
2237 _cleanup_umask_ mode_t u
;
2240 assert(kmsg_socket
>= 0);
2244 /* We create the kmsg FIFO as as temporary file in /run, but immediately delete it after bind mounting it to
2245 * /proc/kmsg. While FIFOs on the reading side behave very similar to /proc/kmsg, their writing side behaves
2246 * differently from /dev/kmsg in that writing blocks when nothing is reading. In order to avoid any problems
2247 * with containers deadlocking due to this we simply make /dev/kmsg unavailable to the container. */
2249 r
= tempfn_random_child("/run", "proc-kmsg", &fifo
);
2251 return log_error_errno(r
, "Failed to generate kmsg path: %m");
2253 if (mkfifo(fifo
, 0600) < 0)
2254 return log_error_errno(errno
, "mkfifo() for /run/kmsg failed: %m");
2256 from
= TAKE_PTR(fifo
);
2258 r
= mount_verbose(LOG_ERR
, from
, "/proc/kmsg", NULL
, MS_BIND
, NULL
);
2262 fd
= open(from
, O_RDWR
|O_NONBLOCK
|O_CLOEXEC
);
2264 return log_error_errno(errno
, "Failed to open fifo: %m");
2266 /* Store away the fd in the socket, so that it stays open as long as we run the child */
2267 r
= send_one_fd(kmsg_socket
, fd
, 0);
2269 return log_error_errno(r
, "Failed to send FIFO fd: %m");
2274 static int on_address_change(sd_netlink
*rtnl
, sd_netlink_message
*m
, void *userdata
) {
2275 union in_addr_union
*exposed
= userdata
;
2281 expose_port_execute(rtnl
, arg_expose_ports
, exposed
);
2285 static int setup_hostname(void) {
2288 if ((arg_clone_ns_flags
& CLONE_NEWUTS
) == 0)
2291 r
= sethostname_idempotent(arg_hostname
?: arg_machine
);
2293 return log_error_errno(r
, "Failed to set hostname: %m");
2298 static int setup_journal(const char *directory
) {
2299 _cleanup_free_
char *d
= NULL
;
2300 char id
[SD_ID128_STRING_MAX
];
2301 const char *dirname
, *p
, *q
;
2306 /* Don't link journals in ephemeral mode */
2310 if (arg_link_journal
== LINK_NO
)
2313 try = arg_link_journal_try
|| arg_link_journal
== LINK_AUTO
;
2315 r
= sd_id128_get_machine(&this_id
);
2317 return log_error_errno(r
, "Failed to retrieve machine ID: %m");
2319 if (sd_id128_equal(arg_uuid
, this_id
)) {
2320 log_full(try ? LOG_WARNING
: LOG_ERR
,
2321 "Host and machine ids are equal (%s): refusing to link journals", sd_id128_to_string(arg_uuid
, id
));
2327 FOREACH_STRING(dirname
, "/var", "/var/log", "/var/log/journal") {
2328 r
= userns_mkdir(directory
, dirname
, 0755, 0, 0);
2330 bool ignore
= r
== -EROFS
&& try;
2331 log_full_errno(ignore
? LOG_DEBUG
: LOG_ERR
, r
,
2332 "Failed to create %s%s: %m", dirname
, ignore
? ", ignoring" : "");
2333 return ignore
? 0 : r
;
2337 (void) sd_id128_to_string(arg_uuid
, id
);
2339 p
= strjoina("/var/log/journal/", id
);
2340 q
= prefix_roota(directory
, p
);
2342 if (path_is_mount_point(p
, NULL
, 0) > 0) {
2346 return log_error_errno(SYNTHETIC_ERRNO(EEXIST
),
2347 "%s: already a mount point, refusing to use for journal", p
);
2350 if (path_is_mount_point(q
, NULL
, 0) > 0) {
2354 return log_error_errno(SYNTHETIC_ERRNO(EEXIST
),
2355 "%s: already a mount point, refusing to use for journal", q
);
2358 r
= readlink_and_make_absolute(p
, &d
);
2360 if (IN_SET(arg_link_journal
, LINK_GUEST
, LINK_AUTO
) &&
2363 r
= userns_mkdir(directory
, p
, 0755, 0, 0);
2365 log_warning_errno(r
, "Failed to create directory %s: %m", q
);
2370 return log_error_errno(errno
, "Failed to remove symlink %s: %m", p
);
2371 } else if (r
== -EINVAL
) {
2373 if (arg_link_journal
== LINK_GUEST
&&
2376 if (errno
== ENOTDIR
) {
2377 log_error("%s already exists and is neither a symlink nor a directory", p
);
2380 return log_error_errno(errno
, "Failed to remove %s: %m", p
);
2382 } else if (r
!= -ENOENT
)
2383 return log_error_errno(r
, "readlink(%s) failed: %m", p
);
2385 if (arg_link_journal
== LINK_GUEST
) {
2387 if (symlink(q
, p
) < 0) {
2389 log_debug_errno(errno
, "Failed to symlink %s to %s, skipping journal setup: %m", q
, p
);
2392 return log_error_errno(errno
, "Failed to symlink %s to %s: %m", q
, p
);
2395 r
= userns_mkdir(directory
, p
, 0755, 0, 0);
2397 log_warning_errno(r
, "Failed to create directory %s: %m", q
);
2401 if (arg_link_journal
== LINK_HOST
) {
2402 /* don't create parents here — if the host doesn't have
2403 * permanent journal set up, don't force it here */
2405 r
= mkdir_errno_wrapper(p
, 0755);
2406 if (r
< 0 && r
!= -EEXIST
) {
2408 log_debug_errno(r
, "Failed to create %s, skipping journal setup: %m", p
);
2411 return log_error_errno(r
, "Failed to create %s: %m", p
);
2414 } else if (access(p
, F_OK
) < 0)
2417 if (dir_is_empty(q
) == 0)
2418 log_warning("%s is not empty, proceeding anyway.", q
);
2420 r
= userns_mkdir(directory
, p
, 0755, 0, 0);
2422 return log_error_errno(r
, "Failed to create %s: %m", q
);
2424 r
= mount_verbose(LOG_DEBUG
, p
, q
, NULL
, MS_BIND
, NULL
);
2426 return log_error_errno(errno
, "Failed to bind mount journal from host into guest: %m");
2431 static int drop_capabilities(uid_t uid
) {
2432 CapabilityQuintet q
;
2434 /* Let's initialize all five capability sets to something valid. If the quintet was configured via
2435 * OCI use that, but fill in missing bits. If it wasn't then derive the quintet in full from
2436 * arg_caps_retain. */
2438 if (capability_quintet_is_set(&arg_full_capabilities
)) {
2439 q
= arg_full_capabilities
;
2441 if (q
.bounding
== (uint64_t) -1)
2442 q
.bounding
= uid
== 0 ? arg_caps_retain
: 0;
2444 if (q
.effective
== (uint64_t) -1)
2445 q
.effective
= uid
== 0 ? q
.bounding
: 0;
2447 if (q
.inheritable
== (uint64_t) -1)
2448 q
.inheritable
= uid
== 0 ? q
.bounding
: 0;
2450 if (q
.permitted
== (uint64_t) -1)
2451 q
.permitted
= uid
== 0 ? q
.bounding
: 0;
2453 if (q
.ambient
== (uint64_t) -1 && ambient_capabilities_supported())
2456 if (capability_quintet_mangle(&q
))
2457 return log_error_errno(SYNTHETIC_ERRNO(EPERM
), "Cannot set capabilities that are not in the current bounding set.");
2460 q
= (CapabilityQuintet
) {
2461 .bounding
= arg_caps_retain
,
2462 .effective
= uid
== 0 ? arg_caps_retain
: 0,
2463 .inheritable
= uid
== 0 ? arg_caps_retain
: 0,
2464 .permitted
= uid
== 0 ? arg_caps_retain
: 0,
2465 .ambient
= ambient_capabilities_supported() ? 0 : (uint64_t) -1,
2468 /* If we're not using OCI, proceed with mangled capabilities (so we don't error out)
2469 * in order to maintain the same behavior as systemd < 242. */
2470 if (capability_quintet_mangle(&q
))
2471 log_full(arg_quiet
? LOG_DEBUG
: LOG_WARNING
,
2472 "Some capabilities will not be set because they are not in the current bounding set.");
2476 return capability_quintet_enforce(&q
);
2479 static int reset_audit_loginuid(void) {
2480 _cleanup_free_
char *p
= NULL
;
2483 if ((arg_clone_ns_flags
& CLONE_NEWPID
) == 0)
2486 r
= read_one_line_file("/proc/self/loginuid", &p
);
2490 return log_error_errno(r
, "Failed to read /proc/self/loginuid: %m");
2492 /* Already reset? */
2493 if (streq(p
, "4294967295"))
2496 r
= write_string_file("/proc/self/loginuid", "4294967295", WRITE_STRING_FILE_DISABLE_BUFFER
);
2499 "Failed to reset audit login UID. This probably means that your kernel is too\n"
2500 "old and you have audit enabled. Note that the auditing subsystem is known to\n"
2501 "be incompatible with containers on old kernels. Please make sure to upgrade\n"
2502 "your kernel or to off auditing with 'audit=0' on the kernel command line before\n"
2503 "using systemd-nspawn. Sleeping for 5s... (%m)");
2511 static int setup_propagate(const char *root
) {
2515 (void) mkdir_p("/run/systemd/nspawn/", 0755);
2516 (void) mkdir_p("/run/systemd/nspawn/propagate", 0600);
2517 p
= strjoina("/run/systemd/nspawn/propagate/", arg_machine
);
2518 (void) mkdir_p(p
, 0600);
2520 r
= userns_mkdir(root
, "/run/systemd", 0755, 0, 0);
2522 return log_error_errno(r
, "Failed to create /run/systemd: %m");
2524 r
= userns_mkdir(root
, "/run/systemd/nspawn", 0755, 0, 0);
2526 return log_error_errno(r
, "Failed to create /run/systemd/nspawn: %m");
2528 r
= userns_mkdir(root
, "/run/systemd/nspawn/incoming", 0600, 0, 0);
2530 return log_error_errno(r
, "Failed to create /run/systemd/nspawn/incoming: %m");
2532 q
= prefix_roota(root
, "/run/systemd/nspawn/incoming");
2533 r
= mount_verbose(LOG_ERR
, p
, q
, NULL
, MS_BIND
, NULL
);
2537 r
= mount_verbose(LOG_ERR
, NULL
, q
, NULL
, MS_BIND
|MS_REMOUNT
|MS_RDONLY
, NULL
);
2541 /* machined will MS_MOVE into that directory, and that's only
2542 * supported for non-shared mounts. */
2543 return mount_verbose(LOG_ERR
, NULL
, q
, NULL
, MS_SLAVE
, NULL
);
2546 static int setup_machine_id(const char *directory
) {
2547 const char *etc_machine_id
;
2551 /* If the UUID in the container is already set, then that's what counts, and we use. If it isn't set, and the
2552 * caller passed --uuid=, then we'll pass it in the $container_uuid env var to PID 1 of the container. The
2553 * assumption is that PID 1 will then write it to /etc/machine-id to make it persistent. If --uuid= is not
2554 * passed we generate a random UUID, and pass it via $container_uuid. In effect this means that /etc/machine-id
2555 * in the container and our idea of the container UUID will always be in sync (at least if PID 1 in the
2556 * container behaves nicely). */
2558 etc_machine_id
= prefix_roota(directory
, "/etc/machine-id");
2560 r
= id128_read(etc_machine_id
, ID128_PLAIN
, &id
);
2562 if (!IN_SET(r
, -ENOENT
, -ENOMEDIUM
)) /* If the file is missing or empty, we don't mind */
2563 return log_error_errno(r
, "Failed to read machine ID from container image: %m");
2565 if (sd_id128_is_null(arg_uuid
)) {
2566 r
= sd_id128_randomize(&arg_uuid
);
2568 return log_error_errno(r
, "Failed to acquire randomized machine UUID: %m");
2571 if (sd_id128_is_null(id
))
2572 return log_error_errno(SYNTHETIC_ERRNO(EINVAL
),
2573 "Machine ID in container image is zero, refusing.");
2581 static int recursive_chown(const char *directory
, uid_t shift
, uid_t range
) {
2586 if (arg_userns_mode
== USER_NAMESPACE_NO
|| !arg_userns_chown
)
2589 r
= path_patch_uid(directory
, arg_uid_shift
, arg_uid_range
);
2590 if (r
== -EOPNOTSUPP
)
2591 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.");
2593 return log_error_errno(r
, "Upper 16 bits of root directory UID and GID do not match.");
2595 return log_error_errno(r
, "Failed to adjust UID/GID shift of OS tree: %m");
2597 log_debug("Root directory of image is already owned by the right UID/GID range, skipping recursive chown operation.");
2599 log_debug("Patched directory tree to match UID/GID range.");
2606 * < 0 : wait_for_terminate() failed to get the state of the
2607 * container, the container was terminated by a signal, or
2608 * failed for an unknown reason. No change is made to the
2609 * container argument.
2610 * > 0 : The program executed in the container terminated with an
2611 * error. The exit code of the program executed in the
2612 * container is returned. The container argument has been set
2613 * to CONTAINER_TERMINATED.
2614 * 0 : The container is being rebooted, has been shut down or exited
2615 * successfully. The container argument has been set to either
2616 * CONTAINER_TERMINATED or CONTAINER_REBOOTED.
2618 * That is, success is indicated by a return value of zero, and an
2619 * error is indicated by a non-zero value.
2621 static int wait_for_container(pid_t pid
, ContainerStatus
*container
) {
2625 r
= wait_for_terminate(pid
, &status
);
2627 return log_warning_errno(r
, "Failed to wait for container: %m");
2629 switch (status
.si_code
) {
2632 if (status
.si_status
== 0)
2633 log_full(arg_quiet
? LOG_DEBUG
: LOG_INFO
, "Container %s exited successfully.", arg_machine
);
2635 log_full(arg_quiet
? LOG_DEBUG
: LOG_INFO
, "Container %s failed with error code %i.", arg_machine
, status
.si_status
);
2637 *container
= CONTAINER_TERMINATED
;
2638 return status
.si_status
;
2641 if (status
.si_status
== SIGINT
) {
2642 log_full(arg_quiet
? LOG_DEBUG
: LOG_INFO
, "Container %s has been shut down.", arg_machine
);
2643 *container
= CONTAINER_TERMINATED
;
2646 } else if (status
.si_status
== SIGHUP
) {
2647 log_full(arg_quiet
? LOG_DEBUG
: LOG_INFO
, "Container %s is being rebooted.", arg_machine
);
2648 *container
= CONTAINER_REBOOTED
;
2654 return log_error_errno(SYNTHETIC_ERRNO(EIO
),
2655 "Container %s terminated by signal %s.", arg_machine
, signal_to_string(status
.si_status
));
2658 return log_error_errno(SYNTHETIC_ERRNO(EIO
),
2659 "Container %s failed due to unknown reason.", arg_machine
);
2663 static int on_orderly_shutdown(sd_event_source
*s
, const struct signalfd_siginfo
*si
, void *userdata
) {
2666 pid
= PTR_TO_PID(userdata
);
2668 if (kill(pid
, arg_kill_signal
) >= 0) {
2669 log_info("Trying to halt container. Send SIGTERM again to trigger immediate termination.");
2670 sd_event_source_set_userdata(s
, NULL
);
2675 sd_event_exit(sd_event_source_get_event(s
), 0);
2679 static int on_sigchld(sd_event_source
*s
, const struct signalfd_siginfo
*ssi
, void *userdata
) {
2685 pid
= PTR_TO_PID(userdata
);
2690 if (waitid(P_ALL
, 0, &si
, WNOHANG
|WNOWAIT
|WEXITED
) < 0)
2691 return log_error_errno(errno
, "Failed to waitid(): %m");
2692 if (si
.si_pid
== 0) /* No pending children. */
2694 if (si
.si_pid
== pid
) {
2695 /* The main process we care for has exited. Return from
2696 * signal handler but leave the zombie. */
2697 sd_event_exit(sd_event_source_get_event(s
), 0);
2701 /* Reap all other children. */
2702 (void) waitid(P_PID
, si
.si_pid
, &si
, WNOHANG
|WEXITED
);
2708 static int on_request_stop(sd_bus_message
*m
, void *userdata
, sd_bus_error
*error
) {
2713 pid
= PTR_TO_PID(userdata
);
2715 if (arg_kill_signal
> 0) {
2716 log_info("Container termination requested. Attempting to halt container.");
2717 (void) kill(pid
, arg_kill_signal
);
2719 log_info("Container termination requested. Exiting.");
2720 sd_event_exit(sd_bus_get_event(sd_bus_message_get_bus(m
)), 0);
2726 static int determine_names(void) {
2729 if (arg_template
&& !arg_directory
&& arg_machine
) {
2731 /* If --template= was specified then we should not
2732 * search for a machine, but instead create a new one
2733 * in /var/lib/machine. */
2735 arg_directory
= path_join("/var/lib/machines", arg_machine
);
2740 if (!arg_image
&& !arg_directory
) {
2742 _cleanup_(image_unrefp
) Image
*i
= NULL
;
2744 r
= image_find(IMAGE_MACHINE
, arg_machine
, &i
);
2746 return log_error_errno(r
, "No image for machine '%s'.", arg_machine
);
2748 return log_error_errno(r
, "Failed to find image for machine '%s': %m", arg_machine
);
2750 if (IN_SET(i
->type
, IMAGE_RAW
, IMAGE_BLOCK
))
2751 r
= free_and_strdup(&arg_image
, i
->path
);
2753 r
= free_and_strdup(&arg_directory
, i
->path
);
2758 arg_read_only
= arg_read_only
|| i
->read_only
;
2760 r
= safe_getcwd(&arg_directory
);
2762 return log_error_errno(r
, "Failed to determine current directory: %m");
2765 if (!arg_directory
&& !arg_image
)
2766 return log_error_errno(SYNTHETIC_ERRNO(EINVAL
), "Failed to determine path, please use -D or -i.");
2770 if (arg_directory
&& path_equal(arg_directory
, "/"))
2771 arg_machine
= gethostname_malloc();
2776 arg_machine
= strdup(basename(arg_image
));
2778 /* Truncate suffix if there is one */
2779 e
= endswith(arg_machine
, ".raw");
2783 arg_machine
= strdup(basename(arg_directory
));
2788 hostname_cleanup(arg_machine
);
2789 if (!machine_name_is_valid(arg_machine
))
2790 return log_error_errno(SYNTHETIC_ERRNO(EINVAL
), "Failed to determine machine name automatically, please use -M.");
2792 if (arg_ephemeral
) {
2795 /* Add a random suffix when this is an
2796 * ephemeral machine, so that we can run many
2797 * instances at once without manually having
2798 * to specify -M each time. */
2800 if (asprintf(&b
, "%s-%016" PRIx64
, arg_machine
, random_u64()) < 0)
2811 static int chase_symlinks_and_update(char **p
, unsigned flags
) {
2820 r
= chase_symlinks(*p
, NULL
, flags
, &chased
, NULL
);
2822 return log_error_errno(r
, "Failed to resolve path %s: %m", *p
);
2824 return free_and_replace(*p
, chased
);
2827 static int determine_uid_shift(const char *directory
) {
2830 if (arg_userns_mode
== USER_NAMESPACE_NO
) {
2835 if (arg_uid_shift
== UID_INVALID
) {
2838 r
= stat(directory
, &st
);
2840 return log_error_errno(errno
, "Failed to determine UID base of %s: %m", directory
);
2842 arg_uid_shift
= st
.st_uid
& UINT32_C(0xffff0000);
2844 if (arg_uid_shift
!= (st
.st_gid
& UINT32_C(0xffff0000)))
2845 return log_error_errno(SYNTHETIC_ERRNO(EINVAL
),
2846 "UID and GID base of %s don't match.", directory
);
2848 arg_uid_range
= UINT32_C(0x10000);
2851 if (arg_uid_shift
> (uid_t
) -1 - arg_uid_range
)
2852 return log_error_errno(SYNTHETIC_ERRNO(EINVAL
),
2853 "UID base too high for UID range.");
2858 static unsigned long effective_clone_ns_flags(void) {
2859 unsigned long flags
= arg_clone_ns_flags
;
2861 if (arg_private_network
)
2862 flags
|= CLONE_NEWNET
;
2864 flags
|= CLONE_NEWCGROUP
;
2865 if (arg_userns_mode
!= USER_NAMESPACE_NO
)
2866 flags
|= CLONE_NEWUSER
;
2871 static int patch_sysctl(void) {
2873 /* This table is inspired by runc's sysctl() function */
2874 static const struct {
2877 unsigned long clone_flags
;
2879 { "kernel.hostname", false, CLONE_NEWUTS
},
2880 { "kernel.domainname", false, CLONE_NEWUTS
},
2881 { "kernel.msgmax", false, CLONE_NEWIPC
},
2882 { "kernel.msgmnb", false, CLONE_NEWIPC
},
2883 { "kernel.msgmni", false, CLONE_NEWIPC
},
2884 { "kernel.sem", false, CLONE_NEWIPC
},
2885 { "kernel.shmall", false, CLONE_NEWIPC
},
2886 { "kernel.shmmax", false, CLONE_NEWIPC
},
2887 { "kernel.shmmni", false, CLONE_NEWIPC
},
2888 { "fs.mqueue.", true, CLONE_NEWIPC
},
2889 { "net.", true, CLONE_NEWNET
},
2892 unsigned long flags
;
2896 flags
= effective_clone_ns_flags();
2898 STRV_FOREACH_PAIR(k
, v
, arg_sysctl
) {
2902 for (i
= 0; i
< ELEMENTSOF(safe_sysctl
); i
++) {
2904 if (!FLAGS_SET(flags
, safe_sysctl
[i
].clone_flags
))
2907 if (safe_sysctl
[i
].prefix
)
2908 good
= startswith(*k
, safe_sysctl
[i
].key
);
2910 good
= streq(*k
, safe_sysctl
[i
].key
);
2917 return log_error_errno(SYNTHETIC_ERRNO(EPERM
), "Refusing to write to sysctl '%s', as it is not safe in the selected namespaces.", *k
);
2919 r
= sysctl_write(*k
, *v
);
2921 return log_error_errno(r
, "Failed to write sysctl '%s': %m", *k
);
2927 static int inner_child(
2929 const char *directory
,
2933 int master_pty_socket
,
2936 _cleanup_free_
char *home
= NULL
;
2937 char as_uuid
[ID128_UUID_STRING_MAX
];
2939 const char *envp
[] = {
2940 "PATH=" DEFAULT_PATH_COMPAT
,
2941 NULL
, /* container */
2946 NULL
, /* container_uuid */
2947 NULL
, /* LISTEN_FDS */
2948 NULL
, /* LISTEN_PID */
2949 NULL
, /* NOTIFY_SOCKET */
2952 const char *exec_target
;
2953 _cleanup_strv_free_
char **env_use
= NULL
;
2954 int r
, which_failed
;
2956 /* This is the "inner" child process, i.e. the one forked off by the "outer" child process, which is the one
2957 * the container manager itself forked off. At the time of clone() it gained its own CLONE_NEWNS, CLONE_NEWPID,
2958 * CLONE_NEWUTS, CLONE_NEWIPC, CLONE_NEWUSER namespaces. Note that it has its own CLONE_NEWNS namespace,
2959 * separate from the CLONE_NEWNS created for the "outer" child, and also separate from the host's CLONE_NEWNS
2960 * namespace. The reason for having two levels of CLONE_NEWNS namespaces is that the "inner" one is owned by
2961 * the CLONE_NEWUSER namespace of the container, while the "outer" one is owned by the host's CLONE_NEWUSER
2964 * Note at this point we have no CLONE_NEWNET namespace yet. We'll acquire that one later through
2965 * unshare(). See below. */
2969 assert(kmsg_socket
>= 0);
2971 log_debug("Inner child is initializing.");
2973 if (arg_userns_mode
!= USER_NAMESPACE_NO
) {
2974 /* Tell the parent, that it now can write the UID map. */
2975 (void) barrier_place(barrier
); /* #1 */
2977 /* Wait until the parent wrote the UID map */
2978 if (!barrier_place_and_sync(barrier
)) /* #2 */
2979 return log_error_errno(SYNTHETIC_ERRNO(ESRCH
),
2980 "Parent died too early");
2983 r
= reset_uid_gid();
2985 return log_error_errno(r
, "Couldn't become new root: %m");
2988 arg_mount_settings
| MOUNT_IN_USERNS
,
2990 arg_selinux_apifs_context
);
2994 if (!arg_network_namespace_path
&& arg_private_network
) {
2995 r
= unshare(CLONE_NEWNET
);
2997 return log_error_errno(errno
, "Failed to unshare network namespace: %m");
2999 /* Tell the parent that it can setup network interfaces. */
3000 (void) barrier_place(barrier
); /* #3 */
3003 r
= mount_sysfs(NULL
, arg_mount_settings
);
3007 /* Wait until we are cgroup-ified, so that we
3008 * can mount the right cgroup path writable */
3009 if (!barrier_place_and_sync(barrier
)) /* #4 */
3010 return log_error_errno(SYNTHETIC_ERRNO(ESRCH
),
3011 "Parent died too early");
3014 r
= unshare(CLONE_NEWCGROUP
);
3016 return log_error_errno(errno
, "Failed to unshare cgroup namespace: %m");
3019 arg_unified_cgroup_hierarchy
,
3020 arg_userns_mode
!= USER_NAMESPACE_NO
,
3023 arg_selinux_apifs_context
,
3026 r
= mount_systemd_cgroup_writable("", arg_unified_cgroup_hierarchy
);
3030 r
= setup_boot_id();
3034 r
= setup_kmsg(kmsg_socket
);
3037 kmsg_socket
= safe_close(kmsg_socket
);
3042 arg_n_custom_mounts
,
3044 arg_selinux_apifs_context
,
3045 MOUNT_NON_ROOT_ONLY
| MOUNT_IN_USERNS
);
3050 return log_error_errno(errno
, "setsid() failed: %m");
3052 if (arg_private_network
)
3053 (void) loopback_setup();
3055 if (arg_expose_ports
) {
3056 r
= expose_port_send_rtnl(rtnl_socket
);
3059 rtnl_socket
= safe_close(rtnl_socket
);
3062 if (arg_console_mode
!= CONSOLE_PIPE
) {
3063 _cleanup_close_
int master
= -1;
3064 _cleanup_free_
char *console
= NULL
;
3066 /* Allocate a pty and make it available as /dev/console. */
3067 master
= openpt_allocate(O_RDWR
|O_NONBLOCK
, &console
);
3069 return log_error_errno(master
, "Failed to allocate a pty: %m");
3071 r
= setup_dev_console(console
);
3073 return log_error_errno(r
, "Failed to set up /dev/console: %m");
3075 r
= send_one_fd(master_pty_socket
, master
, 0);
3077 return log_error_errno(r
, "Failed to send master fd: %m");
3078 master_pty_socket
= safe_close(master_pty_socket
);
3080 r
= setup_stdio_as_dev_console();
3089 if (arg_oom_score_adjust_set
) {
3090 r
= set_oom_score_adjust(arg_oom_score_adjust
);
3092 return log_error_errno(r
, "Failed to adjust OOM score: %m");
3095 if (arg_cpu_set
.set
)
3096 if (sched_setaffinity(0, arg_cpu_set
.allocated
, arg_cpu_set
.set
) < 0)
3097 return log_error_errno(errno
, "Failed to set CPU affinity: %m");
3099 (void) setup_hostname();
3101 if (arg_personality
!= PERSONALITY_INVALID
) {
3102 r
= safe_personality(arg_personality
);
3104 return log_error_errno(r
, "personality() failed: %m");
3105 } else if (secondary
) {
3106 r
= safe_personality(PER_LINUX32
);
3108 return log_error_errno(r
, "personality() failed: %m");
3111 r
= setrlimit_closest_all((const struct rlimit
*const*) arg_rlimit
, &which_failed
);
3113 return log_error_errno(r
, "Failed to apply resource limit RLIMIT_%s: %m", rlimit_to_string(which_failed
));
3118 if (is_seccomp_available()) {
3120 r
= seccomp_load(arg_seccomp
);
3121 if (ERRNO_IS_SECCOMP_FATAL(r
))
3122 return log_error_errno(r
, "Failed to install seccomp filter: %m");
3124 log_debug_errno(r
, "Failed to install seccomp filter: %m");
3129 r
= setup_seccomp(arg_caps_retain
, arg_syscall_allow_list
, arg_syscall_deny_list
);
3135 if (arg_selinux_context
)
3136 if (setexeccon(arg_selinux_context
) < 0)
3137 return log_error_errno(errno
, "setexeccon(\"%s\") failed: %m", arg_selinux_context
);
3140 /* Make sure we keep the caps across the uid/gid dropping, so that we can retain some selected caps
3141 * if we need to later on. */
3142 if (prctl(PR_SET_KEEPCAPS
, 1) < 0)
3143 return log_error_errno(errno
, "Failed to set PR_SET_KEEPCAPS: %m");
3145 if (uid_is_valid(arg_uid
) || gid_is_valid(arg_gid
))
3146 r
= change_uid_gid_raw(arg_uid
, arg_gid
, arg_supplementary_gids
, arg_n_supplementary_gids
);
3148 r
= change_uid_gid(arg_user
, &home
);
3152 r
= drop_capabilities(getuid());
3154 return log_error_errno(r
, "Dropping capabilities failed: %m");
3156 if (arg_no_new_privileges
)
3157 if (prctl(PR_SET_NO_NEW_PRIVS
, 1, 0, 0, 0) < 0)
3158 return log_error_errno(errno
, "Failed to disable new privileges: %m");
3160 /* LXC sets container=lxc, so follow the scheme here */
3161 envp
[n_env
++] = strjoina("container=", arg_container_service_name
);
3163 envp
[n_env
] = strv_find_prefix(environ
, "TERM=");
3167 if (home
|| !uid_is_valid(arg_uid
) || arg_uid
== 0)
3168 if (asprintf((char**)(envp
+ n_env
++), "HOME=%s", home
?: "/root") < 0)
3171 if (arg_user
|| !uid_is_valid(arg_uid
) || arg_uid
== 0)
3172 if (asprintf((char**)(envp
+ n_env
++), "USER=%s", arg_user
?: "root") < 0 ||
3173 asprintf((char**)(envp
+ n_env
++), "LOGNAME=%s", arg_user
? arg_user
: "root") < 0)
3176 assert(!sd_id128_is_null(arg_uuid
));
3178 if (asprintf((char**)(envp
+ n_env
++), "container_uuid=%s", id128_to_uuid_string(arg_uuid
, as_uuid
)) < 0)
3181 if (fdset_size(fds
) > 0) {
3182 r
= fdset_cloexec(fds
, false);
3184 return log_error_errno(r
, "Failed to unset O_CLOEXEC for file descriptors.");
3186 if ((asprintf((char **)(envp
+ n_env
++), "LISTEN_FDS=%u", fdset_size(fds
)) < 0) ||
3187 (asprintf((char **)(envp
+ n_env
++), "LISTEN_PID=1") < 0))
3190 if (asprintf((char **)(envp
+ n_env
++), "NOTIFY_SOCKET=%s", NSPAWN_NOTIFY_SOCKET_PATH
) < 0)
3193 env_use
= strv_env_merge(2, envp
, arg_setenv
);
3197 /* Let the parent know that we are ready and
3198 * wait until the parent is ready with the
3200 if (!barrier_place_and_sync(barrier
)) /* #5 */
3201 return log_error_errno(SYNTHETIC_ERRNO(ESRCH
),
3202 "Parent died too early");
3205 if (chdir(arg_chdir
) < 0)
3206 return log_error_errno(errno
, "Failed to change to specified working directory %s: %m", arg_chdir
);
3208 if (arg_start_mode
== START_PID2
) {
3209 r
= stub_pid1(arg_uuid
);
3214 log_debug("Inner child completed, invoking payload.");
3216 /* Now, explicitly close the log, so that we then can close all remaining fds. Closing the log explicitly first
3217 * has the benefit that the logging subsystem knows about it, and is thus ready to be reopened should we need
3218 * it again. Note that the other fds closed here are at least the locking and barrier fds. */
3220 log_set_open_when_needed(true);
3222 (void) fdset_close_others(fds
);
3224 if (arg_start_mode
== START_BOOT
) {
3228 /* Automatically search for the init system */
3230 m
= strv_length(arg_parameters
);
3231 a
= newa(char*, m
+ 2);
3232 memcpy_safe(a
+ 1, arg_parameters
, m
* sizeof(char*));
3235 a
[0] = (char*) "/usr/lib/systemd/systemd";
3236 execve(a
[0], a
, env_use
);
3238 a
[0] = (char*) "/lib/systemd/systemd";
3239 execve(a
[0], a
, env_use
);
3241 a
[0] = (char*) "/sbin/init";
3242 execve(a
[0], a
, env_use
);
3244 exec_target
= "/usr/lib/systemd/systemd, /lib/systemd/systemd, /sbin/init";
3245 } else if (!strv_isempty(arg_parameters
)) {
3246 const char *dollar_path
;
3248 exec_target
= arg_parameters
[0];
3250 /* Use the user supplied search $PATH if there is one, or DEFAULT_PATH_COMPAT if not to search the
3252 dollar_path
= strv_env_get(env_use
, "PATH");
3254 if (putenv((char*) dollar_path
) != 0)
3255 return log_error_errno(errno
, "Failed to update $PATH: %m");
3258 execvpe(arg_parameters
[0], arg_parameters
, env_use
);
3261 /* If we cannot change the directory, we'll end up in /, that is expected. */
3262 (void) chdir(home
?: "/root");
3264 execle("/bin/bash", "-bash", NULL
, env_use
);
3265 execle("/bin/sh", "-sh", NULL
, env_use
);
3267 exec_target
= "/bin/bash, /bin/sh";
3270 return log_error_errno(errno
, "execv(%s) failed: %m", exec_target
);
3273 static int setup_sd_notify_child(void) {
3274 _cleanup_close_
int fd
= -1;
3275 union sockaddr_union sa
= {
3276 .un
.sun_family
= AF_UNIX
,
3277 .un
.sun_path
= NSPAWN_NOTIFY_SOCKET_PATH
,
3281 fd
= socket(AF_UNIX
, SOCK_DGRAM
|SOCK_CLOEXEC
|SOCK_NONBLOCK
, 0);
3283 return log_error_errno(errno
, "Failed to allocate notification socket: %m");
3285 (void) mkdir_parents(NSPAWN_NOTIFY_SOCKET_PATH
, 0755);
3286 (void) sockaddr_un_unlink(&sa
.un
);
3288 r
= bind(fd
, &sa
.sa
, SOCKADDR_UN_LEN(sa
.un
));
3290 return log_error_errno(errno
, "bind(" NSPAWN_NOTIFY_SOCKET_PATH
") failed: %m");
3292 r
= userns_lchown(NSPAWN_NOTIFY_SOCKET_PATH
, 0, 0);
3294 return log_error_errno(r
, "Failed to chown " NSPAWN_NOTIFY_SOCKET_PATH
": %m");
3296 r
= setsockopt_int(fd
, SOL_SOCKET
, SO_PASSCRED
, true);
3298 return log_error_errno(r
, "SO_PASSCRED failed: %m");
3303 static int outer_child(
3305 const char *directory
,
3306 DissectedImage
*dissected_image
,
3313 int uid_shift_socket
,
3314 int master_pty_socket
,
3315 int unified_cgroup_hierarchy_socket
,
3319 _cleanup_close_
int fd
= -1;
3325 /* This is the "outer" child process, i.e the one forked off by the container manager itself. It already has
3326 * its own CLONE_NEWNS namespace (which was created by the clone()). It still lives in the host's CLONE_NEWPID,
3327 * CLONE_NEWUTS, CLONE_NEWIPC, CLONE_NEWUSER and CLONE_NEWNET namespaces. After it completed a number of
3328 * initializations a second child (the "inner" one) is forked off it, and it exits. */
3332 assert(pid_socket
>= 0);
3333 assert(uuid_socket
>= 0);
3334 assert(notify_socket
>= 0);
3335 assert(master_pty_socket
>= 0);
3336 assert(kmsg_socket
>= 0);
3338 log_debug("Outer child is initializing.");
3340 if (prctl(PR_SET_PDEATHSIG
, SIGKILL
) < 0)
3341 return log_error_errno(errno
, "PR_SET_PDEATHSIG failed: %m");
3343 r
= reset_audit_loginuid();
3347 /* Mark everything as slave, so that we still
3348 * receive mounts from the real root, but don't
3349 * propagate mounts to the real root. */
3350 r
= mount_verbose(LOG_ERR
, NULL
, "/", NULL
, MS_SLAVE
|MS_REC
, NULL
);
3354 if (dissected_image
) {
3355 /* If we are operating on a disk image, then mount its root directory now, but leave out the rest. We
3356 * can read the UID shift from it if we need to. Further down we'll mount the rest, but then with the
3357 * uid shift known. That way we can mount VFAT file systems shifted to the right place right away. This
3358 * makes sure ESP partitions and userns are compatible. */
3360 r
= dissected_image_mount(dissected_image
, directory
, arg_uid_shift
,
3361 DISSECT_IMAGE_MOUNT_ROOT_ONLY
|DISSECT_IMAGE_DISCARD_ON_LOOP
|
3362 (arg_read_only
? DISSECT_IMAGE_READ_ONLY
: DISSECT_IMAGE_FSCK
)|
3363 (arg_start_mode
== START_BOOT
? DISSECT_IMAGE_VALIDATE_OS
: 0));
3365 return log_error_errno(r
, "File system check for image failed: %m");
3367 return log_error_errno(r
, "Failed to mount image root file system: %m");
3370 r
= determine_uid_shift(directory
);
3374 if (arg_userns_mode
!= USER_NAMESPACE_NO
) {
3375 /* Let the parent know which UID shift we read from the image */
3376 l
= send(uid_shift_socket
, &arg_uid_shift
, sizeof(arg_uid_shift
), MSG_NOSIGNAL
);
3378 return log_error_errno(errno
, "Failed to send UID shift: %m");
3379 if (l
!= sizeof(arg_uid_shift
))
3380 return log_error_errno(SYNTHETIC_ERRNO(EIO
),
3381 "Short write while sending UID shift.");
3383 if (arg_userns_mode
== USER_NAMESPACE_PICK
) {
3384 /* When we are supposed to pick the UID shift, the parent will check now whether the UID shift
3385 * we just read from the image is available. If yes, it will send the UID shift back to us, if
3386 * not it will pick a different one, and send it back to us. */
3388 l
= recv(uid_shift_socket
, &arg_uid_shift
, sizeof(arg_uid_shift
), 0);
3390 return log_error_errno(errno
, "Failed to recv UID shift: %m");
3391 if (l
!= sizeof(arg_uid_shift
))
3392 return log_error_errno(SYNTHETIC_ERRNO(EIO
),
3393 "Short read while receiving UID shift.");
3396 log_full(arg_quiet
? LOG_DEBUG
: LOG_INFO
,
3397 "Selected user namespace base " UID_FMT
" and range " UID_FMT
".", arg_uid_shift
, arg_uid_range
);
3400 if (path_equal(directory
, "/")) {
3401 /* If the directory we shall boot is the host, let's operate on a bind mount at a different
3402 * place, so that we can make changes to its mount structure (for example, to implement
3403 * --volatile=) without this interfering with our ability to access files such as
3404 * /etc/localtime to copy into the container. Note that we use a fixed place for this
3405 * (instead of a temporary directory, since we are living in our own mount namspace here
3406 * already, and thus don't need to be afraid of colliding with anyone else's mounts).*/
3407 (void) mkdir_p("/run/systemd/nspawn-root", 0755);
3409 r
= mount_verbose(LOG_ERR
, "/", "/run/systemd/nspawn-root", NULL
, MS_BIND
|MS_REC
, NULL
);
3413 directory
= "/run/systemd/nspawn-root";
3416 r
= setup_pivot_root(
3419 arg_pivot_root_old
);
3423 r
= setup_volatile_mode(
3427 arg_selinux_apifs_context
);
3434 arg_n_custom_mounts
,
3436 arg_selinux_apifs_context
,
3441 /* Make sure we always have a mount that we can move to root later on. */
3442 if (!path_is_mount_point(directory
, NULL
, 0)) {
3443 r
= mount_verbose(LOG_ERR
, directory
, directory
, NULL
, MS_BIND
|MS_REC
, NULL
);
3448 if (dissected_image
) {
3449 /* Now we know the uid shift, let's now mount everything else that might be in the image. */
3450 r
= dissected_image_mount(dissected_image
, directory
, arg_uid_shift
,
3451 DISSECT_IMAGE_MOUNT_NON_ROOT_ONLY
|DISSECT_IMAGE_DISCARD_ON_LOOP
|(arg_read_only
? DISSECT_IMAGE_READ_ONLY
: DISSECT_IMAGE_FSCK
));
3453 return log_error_errno(r
, "File system check for image failed: %m");
3455 return log_error_errno(r
, "Failed to mount image file system: %m");
3458 if (arg_unified_cgroup_hierarchy
== CGROUP_UNIFIED_UNKNOWN
) {
3459 /* OK, we don't know yet which cgroup mode to use yet. Let's figure it out, and tell the parent. */
3461 r
= detect_unified_cgroup_hierarchy_from_image(directory
);
3465 l
= send(unified_cgroup_hierarchy_socket
, &arg_unified_cgroup_hierarchy
, sizeof(arg_unified_cgroup_hierarchy
), MSG_NOSIGNAL
);
3467 return log_error_errno(errno
, "Failed to send cgroup mode: %m");
3468 if (l
!= sizeof(arg_unified_cgroup_hierarchy
))
3469 return log_error_errno(SYNTHETIC_ERRNO(EIO
),
3470 "Short write while sending cgroup mode.");
3472 unified_cgroup_hierarchy_socket
= safe_close(unified_cgroup_hierarchy_socket
);
3475 /* Mark everything as shared so our mounts get propagated down. This is
3476 * required to make new bind mounts available in systemd services
3477 * inside the container that create a new mount namespace.
3478 * See https://github.com/systemd/systemd/issues/3860
3479 * Further submounts (such as /dev) done after this will inherit the
3480 * shared propagation mode.
3482 * IMPORTANT: Do not overmount the root directory anymore from now on to
3483 * enable moving the root directory mount to root later on.
3484 * https://github.com/systemd/systemd/issues/3847#issuecomment-562735251
3486 r
= mount_verbose(LOG_ERR
, NULL
, directory
, NULL
, MS_SHARED
|MS_REC
, NULL
);
3490 r
= recursive_chown(directory
, arg_uid_shift
, arg_uid_range
);
3494 r
= base_filesystem_create(directory
, arg_uid_shift
, (gid_t
) arg_uid_shift
);
3498 if (arg_read_only
&& arg_volatile_mode
== VOLATILE_NO
&&
3499 !has_custom_root_mount(arg_custom_mounts
, arg_n_custom_mounts
)) {
3500 r
= bind_remount_recursive(directory
, MS_RDONLY
, MS_RDONLY
, NULL
);
3502 return log_error_errno(r
, "Failed to make tree read-only: %m");
3505 r
= mount_all(directory
,
3508 arg_selinux_apifs_context
);
3512 r
= copy_devnodes(directory
);
3516 r
= make_extra_nodes(directory
);
3520 (void) dev_setup(directory
, arg_uid_shift
, arg_uid_shift
);
3522 p
= prefix_roota(directory
, "/run");
3523 (void) make_inaccessible_nodes(p
, arg_uid_shift
, arg_uid_shift
);
3525 r
= setup_pts(directory
);
3529 r
= setup_propagate(directory
);
3533 r
= setup_keyring();
3540 arg_n_custom_mounts
,
3542 arg_selinux_apifs_context
,
3543 MOUNT_NON_ROOT_ONLY
);
3547 r
= setup_timezone(directory
);
3551 r
= setup_resolv_conf(directory
);
3555 r
= setup_machine_id(directory
);
3559 r
= setup_journal(directory
);
3563 if (!arg_use_cgns
) {
3566 arg_unified_cgroup_hierarchy
,
3567 arg_userns_mode
!= USER_NAMESPACE_NO
,
3570 arg_selinux_apifs_context
,
3576 r
= mount_move_root(directory
);
3578 return log_error_errno(r
, "Failed to move root directory: %m");
3580 fd
= setup_sd_notify_child();
3584 pid
= raw_clone(SIGCHLD
|CLONE_NEWNS
|
3585 arg_clone_ns_flags
|
3586 (arg_userns_mode
!= USER_NAMESPACE_NO
? CLONE_NEWUSER
: 0));
3588 return log_error_errno(errno
, "Failed to fork inner child: %m");
3590 pid_socket
= safe_close(pid_socket
);
3591 uuid_socket
= safe_close(uuid_socket
);
3592 notify_socket
= safe_close(notify_socket
);
3593 uid_shift_socket
= safe_close(uid_shift_socket
);
3595 /* The inner child has all namespaces that are
3596 * requested, so that we all are owned by the user if
3597 * user namespaces are turned on. */
3599 if (arg_network_namespace_path
) {
3600 r
= namespace_enter(-1, -1, netns_fd
, -1, -1);
3602 return log_error_errno(r
, "Failed to join network namespace: %m");
3605 r
= inner_child(barrier
, directory
, secondary
, kmsg_socket
, rtnl_socket
, master_pty_socket
, fds
);
3607 _exit(EXIT_FAILURE
);
3609 _exit(EXIT_SUCCESS
);
3612 l
= send(pid_socket
, &pid
, sizeof(pid
), MSG_NOSIGNAL
);
3614 return log_error_errno(errno
, "Failed to send PID: %m");
3615 if (l
!= sizeof(pid
))
3616 return log_error_errno(SYNTHETIC_ERRNO(EIO
),
3617 "Short write while sending PID.");
3619 l
= send(uuid_socket
, &arg_uuid
, sizeof(arg_uuid
), MSG_NOSIGNAL
);
3621 return log_error_errno(errno
, "Failed to send machine ID: %m");
3622 if (l
!= sizeof(arg_uuid
))
3623 return log_error_errno(SYNTHETIC_ERRNO(EIO
),
3624 "Short write while sending machine ID.");
3626 l
= send_one_fd(notify_socket
, fd
, 0);
3628 return log_error_errno(l
, "Failed to send notify fd: %m");
3630 pid_socket
= safe_close(pid_socket
);
3631 uuid_socket
= safe_close(uuid_socket
);
3632 notify_socket
= safe_close(notify_socket
);
3633 master_pty_socket
= safe_close(master_pty_socket
);
3634 kmsg_socket
= safe_close(kmsg_socket
);
3635 rtnl_socket
= safe_close(rtnl_socket
);
3636 netns_fd
= safe_close(netns_fd
);
3641 static int uid_shift_pick(uid_t
*shift
, LockFile
*ret_lock_file
) {
3642 bool tried_hashed
= false;
3643 unsigned n_tries
= 100;
3648 assert(ret_lock_file
);
3649 assert(arg_userns_mode
== USER_NAMESPACE_PICK
);
3650 assert(arg_uid_range
== 0x10000U
);
3654 (void) mkdir("/run/systemd/nspawn-uid", 0755);
3657 char lock_path
[STRLEN("/run/systemd/nspawn-uid/") + DECIMAL_STR_MAX(uid_t
) + 1];
3658 _cleanup_(release_lock_file
) LockFile lf
= LOCK_FILE_INIT
;
3663 if (candidate
< CONTAINER_UID_BASE_MIN
|| candidate
> CONTAINER_UID_BASE_MAX
)
3665 if ((candidate
& UINT32_C(0xFFFF)) != 0)
3668 xsprintf(lock_path
, "/run/systemd/nspawn-uid/" UID_FMT
, candidate
);
3669 r
= make_lock_file(lock_path
, LOCK_EX
|LOCK_NB
, &lf
);
3670 if (r
== -EBUSY
) /* Range already taken by another nspawn instance */
3675 /* Make some superficial checks whether the range is currently known in the user database */
3676 if (getpwuid(candidate
))
3678 if (getpwuid(candidate
+ UINT32_C(0xFFFE)))
3680 if (getgrgid(candidate
))
3682 if (getgrgid(candidate
+ UINT32_C(0xFFFE)))
3685 *ret_lock_file
= lf
;
3686 lf
= (struct LockFile
) LOCK_FILE_INIT
;
3691 if (arg_machine
&& !tried_hashed
) {
3692 /* Try to hash the base from the container name */
3694 static const uint8_t hash_key
[] = {
3695 0xe1, 0x56, 0xe0, 0xf0, 0x4a, 0xf0, 0x41, 0xaf,
3696 0x96, 0x41, 0xcf, 0x41, 0x33, 0x94, 0xff, 0x72
3699 candidate
= (uid_t
) siphash24(arg_machine
, strlen(arg_machine
), hash_key
);
3701 tried_hashed
= true;
3703 random_bytes(&candidate
, sizeof(candidate
));
3705 candidate
= (candidate
% (CONTAINER_UID_BASE_MAX
- CONTAINER_UID_BASE_MIN
)) + CONTAINER_UID_BASE_MIN
;
3706 candidate
&= (uid_t
) UINT32_C(0xFFFF0000);
3710 static int setup_uid_map(pid_t pid
) {
3711 char uid_map
[STRLEN("/proc//uid_map") + DECIMAL_STR_MAX(uid_t
) + 1], line
[DECIMAL_STR_MAX(uid_t
)*3+3+1];
3716 xsprintf(uid_map
, "/proc/" PID_FMT
"/uid_map", pid
);
3717 xsprintf(line
, UID_FMT
" " UID_FMT
" " UID_FMT
"\n", 0, arg_uid_shift
, arg_uid_range
);
3718 r
= write_string_file(uid_map
, line
, WRITE_STRING_FILE_DISABLE_BUFFER
);
3720 return log_error_errno(r
, "Failed to write UID map: %m");
3722 /* We always assign the same UID and GID ranges */
3723 xsprintf(uid_map
, "/proc/" PID_FMT
"/gid_map", pid
);
3724 r
= write_string_file(uid_map
, line
, WRITE_STRING_FILE_DISABLE_BUFFER
);
3726 return log_error_errno(r
, "Failed to write GID map: %m");
3731 static int nspawn_dispatch_notify_fd(sd_event_source
*source
, int fd
, uint32_t revents
, void *userdata
) {
3732 char buf
[NOTIFY_BUFFER_MAX
+1];
3734 struct iovec iovec
= {
3736 .iov_len
= sizeof(buf
)-1,
3738 CMSG_BUFFER_TYPE(CMSG_SPACE(sizeof(struct ucred
)) +
3739 CMSG_SPACE(sizeof(int) * NOTIFY_FD_MAX
)) control
;
3740 struct msghdr msghdr
= {
3743 .msg_control
= &control
,
3744 .msg_controllen
= sizeof(control
),
3746 struct ucred
*ucred
;
3748 pid_t inner_child_pid
;
3749 _cleanup_strv_free_
char **tags
= NULL
;
3753 inner_child_pid
= PTR_TO_PID(userdata
);
3755 if (revents
!= EPOLLIN
) {
3756 log_warning("Got unexpected poll event for notify fd.");
3760 n
= recvmsg_safe(fd
, &msghdr
, MSG_DONTWAIT
|MSG_CMSG_CLOEXEC
);
3761 if (IN_SET(n
, -EAGAIN
, -EINTR
))
3764 return log_warning_errno(n
, "Couldn't read notification socket: %m");
3766 cmsg_close_all(&msghdr
);
3768 ucred
= CMSG_FIND_DATA(&msghdr
, SOL_SOCKET
, SCM_CREDENTIALS
, struct ucred
);
3769 if (!ucred
|| ucred
->pid
!= inner_child_pid
) {
3770 log_debug("Received notify message without valid credentials. Ignoring.");
3774 if ((size_t) n
>= sizeof(buf
)) {
3775 log_warning("Received notify message exceeded maximum size. Ignoring.");
3780 tags
= strv_split(buf
, "\n\r");
3784 if (strv_find(tags
, "READY=1"))
3785 (void) sd_notifyf(false, "READY=1\n");
3787 p
= strv_find_startswith(tags
, "STATUS=");
3789 (void) sd_notifyf(false, "STATUS=Container running: %s", p
);
3794 static int setup_sd_notify_parent(sd_event
*event
, int fd
, pid_t
*inner_child_pid
, sd_event_source
**notify_event_source
) {
3797 r
= sd_event_add_io(event
, notify_event_source
, fd
, EPOLLIN
, nspawn_dispatch_notify_fd
, inner_child_pid
);
3799 return log_error_errno(r
, "Failed to allocate notify event source: %m");
3801 (void) sd_event_source_set_description(*notify_event_source
, "nspawn-notify");
3806 static int merge_settings(Settings
*settings
, const char *path
) {
3812 /* Copy over bits from the settings, unless they have been explicitly masked by command line switches. Note
3813 * that this steals the fields of the Settings* structure, and hence modifies it. */
3815 if ((arg_settings_mask
& SETTING_START_MODE
) == 0 &&
3816 settings
->start_mode
>= 0) {
3817 arg_start_mode
= settings
->start_mode
;
3818 strv_free_and_replace(arg_parameters
, settings
->parameters
);
3821 if ((arg_settings_mask
& SETTING_EPHEMERAL
) == 0)
3822 arg_ephemeral
= settings
->ephemeral
;
3824 if ((arg_settings_mask
& SETTING_DIRECTORY
) == 0 &&
3827 if (!arg_settings_trusted
)
3828 log_warning("Ignoring root directory setting, file %s is not trusted.", path
);
3830 free_and_replace(arg_directory
, settings
->root
);
3833 if ((arg_settings_mask
& SETTING_PIVOT_ROOT
) == 0 &&
3834 settings
->pivot_root_new
) {
3835 free_and_replace(arg_pivot_root_new
, settings
->pivot_root_new
);
3836 free_and_replace(arg_pivot_root_old
, settings
->pivot_root_old
);
3839 if ((arg_settings_mask
& SETTING_WORKING_DIRECTORY
) == 0 &&
3840 settings
->working_directory
)
3841 free_and_replace(arg_chdir
, settings
->working_directory
);
3843 if ((arg_settings_mask
& SETTING_ENVIRONMENT
) == 0 &&
3844 settings
->environment
)
3845 strv_free_and_replace(arg_setenv
, settings
->environment
);
3847 if ((arg_settings_mask
& SETTING_USER
) == 0) {
3850 free_and_replace(arg_user
, settings
->user
);
3852 if (uid_is_valid(settings
->uid
))
3853 arg_uid
= settings
->uid
;
3854 if (gid_is_valid(settings
->gid
))
3855 arg_gid
= settings
->gid
;
3856 if (settings
->n_supplementary_gids
> 0) {
3857 free_and_replace(arg_supplementary_gids
, settings
->supplementary_gids
);
3858 arg_n_supplementary_gids
= settings
->n_supplementary_gids
;
3862 if ((arg_settings_mask
& SETTING_CAPABILITY
) == 0) {
3863 uint64_t plus
, minus
;
3864 uint64_t network_minus
= 0;
3866 /* Note that we copy both the simple plus/minus caps here, and the full quintet from the
3867 * Settings structure */
3869 plus
= settings
->capability
;
3870 minus
= settings
->drop_capability
;
3872 if ((arg_settings_mask
& SETTING_NETWORK
) == 0) {
3873 if (settings_private_network(settings
))
3874 plus
|= UINT64_C(1) << CAP_NET_ADMIN
;
3876 network_minus
|= UINT64_C(1) << CAP_NET_ADMIN
;
3879 if (!arg_settings_trusted
&& plus
!= 0) {
3880 if (settings
->capability
!= 0)
3881 log_warning("Ignoring Capability= setting, file %s is not trusted.", path
);
3883 arg_caps_retain
&= ~network_minus
;
3884 arg_caps_retain
|= plus
;
3887 arg_caps_retain
&= ~minus
;
3889 /* Copy the full capabilities over too */
3890 if (capability_quintet_is_set(&settings
->full_capabilities
)) {
3891 if (!arg_settings_trusted
)
3892 log_warning("Ignoring capability settings, file %s is not trusted.", path
);
3894 arg_full_capabilities
= settings
->full_capabilities
;
3898 if ((arg_settings_mask
& SETTING_KILL_SIGNAL
) == 0 &&
3899 settings
->kill_signal
> 0)
3900 arg_kill_signal
= settings
->kill_signal
;
3902 if ((arg_settings_mask
& SETTING_PERSONALITY
) == 0 &&
3903 settings
->personality
!= PERSONALITY_INVALID
)
3904 arg_personality
= settings
->personality
;
3906 if ((arg_settings_mask
& SETTING_MACHINE_ID
) == 0 &&
3907 !sd_id128_is_null(settings
->machine_id
)) {
3909 if (!arg_settings_trusted
)
3910 log_warning("Ignoring MachineID= setting, file %s is not trusted.", path
);
3912 arg_uuid
= settings
->machine_id
;
3915 if ((arg_settings_mask
& SETTING_READ_ONLY
) == 0 &&
3916 settings
->read_only
>= 0)
3917 arg_read_only
= settings
->read_only
;
3919 if ((arg_settings_mask
& SETTING_VOLATILE_MODE
) == 0 &&
3920 settings
->volatile_mode
!= _VOLATILE_MODE_INVALID
)
3921 arg_volatile_mode
= settings
->volatile_mode
;
3923 if ((arg_settings_mask
& SETTING_CUSTOM_MOUNTS
) == 0 &&
3924 settings
->n_custom_mounts
> 0) {
3926 if (!arg_settings_trusted
)
3927 log_warning("Ignoring TemporaryFileSystem=, Bind= and BindReadOnly= settings, file %s is not trusted.", path
);
3929 custom_mount_free_all(arg_custom_mounts
, arg_n_custom_mounts
);
3930 arg_custom_mounts
= TAKE_PTR(settings
->custom_mounts
);
3931 arg_n_custom_mounts
= settings
->n_custom_mounts
;
3932 settings
->n_custom_mounts
= 0;
3936 if ((arg_settings_mask
& SETTING_NETWORK
) == 0 &&
3937 (settings
->private_network
>= 0 ||
3938 settings
->network_veth
>= 0 ||
3939 settings
->network_bridge
||
3940 settings
->network_zone
||
3941 settings
->network_interfaces
||
3942 settings
->network_macvlan
||
3943 settings
->network_ipvlan
||
3944 settings
->network_veth_extra
||
3945 settings
->network_namespace_path
)) {
3947 if (!arg_settings_trusted
)
3948 log_warning("Ignoring network settings, file %s is not trusted.", path
);
3950 arg_network_veth
= settings_network_veth(settings
);
3951 arg_private_network
= settings_private_network(settings
);
3953 strv_free_and_replace(arg_network_interfaces
, settings
->network_interfaces
);
3954 strv_free_and_replace(arg_network_macvlan
, settings
->network_macvlan
);
3955 strv_free_and_replace(arg_network_ipvlan
, settings
->network_ipvlan
);
3956 strv_free_and_replace(arg_network_veth_extra
, settings
->network_veth_extra
);
3958 free_and_replace(arg_network_bridge
, settings
->network_bridge
);
3959 free_and_replace(arg_network_zone
, settings
->network_zone
);
3961 free_and_replace(arg_network_namespace_path
, settings
->network_namespace_path
);
3965 if ((arg_settings_mask
& SETTING_EXPOSE_PORTS
) == 0 &&
3966 settings
->expose_ports
) {
3968 if (!arg_settings_trusted
)
3969 log_warning("Ignoring Port= setting, file %s is not trusted.", path
);
3971 expose_port_free_all(arg_expose_ports
);
3972 arg_expose_ports
= TAKE_PTR(settings
->expose_ports
);
3976 if ((arg_settings_mask
& SETTING_USERNS
) == 0 &&
3977 settings
->userns_mode
!= _USER_NAMESPACE_MODE_INVALID
) {
3979 if (!arg_settings_trusted
)
3980 log_warning("Ignoring PrivateUsers= and PrivateUsersChown= settings, file %s is not trusted.", path
);
3982 arg_userns_mode
= settings
->userns_mode
;
3983 arg_uid_shift
= settings
->uid_shift
;
3984 arg_uid_range
= settings
->uid_range
;
3985 arg_userns_chown
= settings
->userns_chown
;
3989 if ((arg_settings_mask
& SETTING_NOTIFY_READY
) == 0)
3990 arg_notify_ready
= settings
->notify_ready
;
3992 if ((arg_settings_mask
& SETTING_SYSCALL_FILTER
) == 0) {
3994 if (!arg_settings_trusted
&& !strv_isempty(settings
->syscall_allow_list
))
3995 log_warning("Ignoring SystemCallFilter= settings, file %s is not trusted.", path
);
3997 strv_free_and_replace(arg_syscall_allow_list
, settings
->syscall_allow_list
);
3998 strv_free_and_replace(arg_syscall_deny_list
, settings
->syscall_deny_list
);
4002 if (!arg_settings_trusted
&& settings
->seccomp
)
4003 log_warning("Ignoring SECCOMP filter, file %s is not trusted.", path
);
4005 seccomp_release(arg_seccomp
);
4006 arg_seccomp
= TAKE_PTR(settings
->seccomp
);
4011 for (rl
= 0; rl
< _RLIMIT_MAX
; rl
++) {
4012 if ((arg_settings_mask
& (SETTING_RLIMIT_FIRST
<< rl
)))
4015 if (!settings
->rlimit
[rl
])
4018 if (!arg_settings_trusted
) {
4019 log_warning("Ignoring Limit%s= setting, file '%s' is not trusted.", rlimit_to_string(rl
), path
);
4023 free_and_replace(arg_rlimit
[rl
], settings
->rlimit
[rl
]);
4026 if ((arg_settings_mask
& SETTING_HOSTNAME
) == 0 &&
4028 free_and_replace(arg_hostname
, settings
->hostname
);
4030 if ((arg_settings_mask
& SETTING_NO_NEW_PRIVILEGES
) == 0 &&
4031 settings
->no_new_privileges
>= 0)
4032 arg_no_new_privileges
= settings
->no_new_privileges
;
4034 if ((arg_settings_mask
& SETTING_OOM_SCORE_ADJUST
) == 0 &&
4035 settings
->oom_score_adjust_set
) {
4037 if (!arg_settings_trusted
)
4038 log_warning("Ignoring OOMScoreAdjust= setting, file '%s' is not trusted.", path
);
4040 arg_oom_score_adjust
= settings
->oom_score_adjust
;
4041 arg_oom_score_adjust_set
= true;
4045 if ((arg_settings_mask
& SETTING_CPU_AFFINITY
) == 0 &&
4046 settings
->cpu_set
.set
) {
4048 if (!arg_settings_trusted
)
4049 log_warning("Ignoring CPUAffinity= setting, file '%s' is not trusted.", path
);
4051 cpu_set_reset(&arg_cpu_set
);
4052 arg_cpu_set
= settings
->cpu_set
;
4053 settings
->cpu_set
= (CPUSet
) {};
4057 if ((arg_settings_mask
& SETTING_RESOLV_CONF
) == 0 &&
4058 settings
->resolv_conf
!= _RESOLV_CONF_MODE_INVALID
)
4059 arg_resolv_conf
= settings
->resolv_conf
;
4061 if ((arg_settings_mask
& SETTING_LINK_JOURNAL
) == 0 &&
4062 settings
->link_journal
!= _LINK_JOURNAL_INVALID
) {
4064 if (!arg_settings_trusted
)
4065 log_warning("Ignoring journal link setting, file '%s' is not trusted.", path
);
4067 arg_link_journal
= settings
->link_journal
;
4068 arg_link_journal_try
= settings
->link_journal_try
;
4072 if ((arg_settings_mask
& SETTING_TIMEZONE
) == 0 &&
4073 settings
->timezone
!= _TIMEZONE_MODE_INVALID
)
4074 arg_timezone
= settings
->timezone
;
4076 if ((arg_settings_mask
& SETTING_SLICE
) == 0 &&
4079 if (!arg_settings_trusted
)
4080 log_warning("Ignoring slice setting, file '%s' is not trusted.", path
);
4082 free_and_replace(arg_slice
, settings
->slice
);
4085 if ((arg_settings_mask
& SETTING_USE_CGNS
) == 0 &&
4086 settings
->use_cgns
>= 0) {
4088 if (!arg_settings_trusted
)
4089 log_warning("Ignoring cgroup namespace setting, file '%s' is not trusted.", path
);
4091 arg_use_cgns
= settings
->use_cgns
;
4094 if ((arg_settings_mask
& SETTING_CLONE_NS_FLAGS
) == 0 &&
4095 settings
->clone_ns_flags
!= (unsigned long) -1) {
4097 if (!arg_settings_trusted
)
4098 log_warning("Ignoring namespace setting, file '%s' is not trusted.", path
);
4100 arg_clone_ns_flags
= settings
->clone_ns_flags
;
4103 if ((arg_settings_mask
& SETTING_CONSOLE_MODE
) == 0 &&
4104 settings
->console_mode
>= 0) {
4106 if (!arg_settings_trusted
)
4107 log_warning("Ignoring console mode setting, file '%s' is not trusted.", path
);
4109 arg_console_mode
= settings
->console_mode
;
4112 /* The following properties can only be set through the OCI settings logic, not from the command line, hence we
4113 * don't consult arg_settings_mask for them. */
4115 sd_bus_message_unref(arg_property_message
);
4116 arg_property_message
= TAKE_PTR(settings
->properties
);
4118 arg_console_width
= settings
->console_width
;
4119 arg_console_height
= settings
->console_height
;
4121 device_node_array_free(arg_extra_nodes
, arg_n_extra_nodes
);
4122 arg_extra_nodes
= TAKE_PTR(settings
->extra_nodes
);
4123 arg_n_extra_nodes
= settings
->n_extra_nodes
;
4128 static int load_settings(void) {
4129 _cleanup_(settings_freep
) Settings
*settings
= NULL
;
4130 _cleanup_fclose_
FILE *f
= NULL
;
4131 _cleanup_free_
char *p
= NULL
;
4138 /* If all settings are masked, there's no point in looking for
4139 * the settings file */
4140 if ((arg_settings_mask
& _SETTINGS_MASK_ALL
) == _SETTINGS_MASK_ALL
)
4143 fn
= strjoina(arg_machine
, ".nspawn");
4145 /* We first look in the admin's directories in /etc and /run */
4146 FOREACH_STRING(i
, "/etc/systemd/nspawn", "/run/systemd/nspawn") {
4147 _cleanup_free_
char *j
= NULL
;
4149 j
= path_join(i
, fn
);
4157 /* By default, we trust configuration from /etc and /run */
4158 if (arg_settings_trusted
< 0)
4159 arg_settings_trusted
= true;
4164 if (errno
!= ENOENT
)
4165 return log_error_errno(errno
, "Failed to open %s: %m", j
);
4169 /* After that, let's look for a file next to the
4170 * actual image we shall boot. */
4173 p
= file_in_same_dir(arg_image
, fn
);
4176 } else if (arg_directory
&& !path_equal(arg_directory
, "/")) {
4177 p
= file_in_same_dir(arg_directory
, fn
);
4184 if (!f
&& errno
!= ENOENT
)
4185 return log_error_errno(errno
, "Failed to open %s: %m", p
);
4187 /* By default, we do not trust configuration from /var/lib/machines */
4188 if (arg_settings_trusted
< 0)
4189 arg_settings_trusted
= false;
4196 log_debug("Settings are trusted: %s", yes_no(arg_settings_trusted
));
4198 r
= settings_load(f
, p
, &settings
);
4202 return merge_settings(settings
, p
);
4205 static int load_oci_bundle(void) {
4206 _cleanup_(settings_freep
) Settings
*settings
= NULL
;
4209 if (!arg_oci_bundle
)
4212 /* By default let's trust OCI bundles */
4213 if (arg_settings_trusted
< 0)
4214 arg_settings_trusted
= true;
4216 r
= oci_load(NULL
, arg_oci_bundle
, &settings
);
4220 return merge_settings(settings
, arg_oci_bundle
);
4223 static int run_container(
4224 DissectedImage
*dissected_image
,
4227 char veth_name
[IFNAMSIZ
], bool *veth_created
,
4228 union in_addr_union
*exposed
,
4229 int *master
, pid_t
*pid
, int *ret
) {
4231 static const struct sigaction sa
= {
4232 .sa_handler
= nop_signal_handler
,
4233 .sa_flags
= SA_NOCLDSTOP
|SA_RESTART
,
4236 _cleanup_(release_lock_file
) LockFile uid_shift_lock
= LOCK_FILE_INIT
;
4237 _cleanup_close_
int etc_passwd_lock
= -1;
4238 _cleanup_close_pair_
int
4239 kmsg_socket_pair
[2] = { -1, -1 },
4240 rtnl_socket_pair
[2] = { -1, -1 },
4241 pid_socket_pair
[2] = { -1, -1 },
4242 uuid_socket_pair
[2] = { -1, -1 },
4243 notify_socket_pair
[2] = { -1, -1 },
4244 uid_shift_socket_pair
[2] = { -1, -1 },
4245 master_pty_socket_pair
[2] = { -1, -1 },
4246 unified_cgroup_hierarchy_socket_pair
[2] = { -1, -1};
4248 _cleanup_close_
int notify_socket
= -1;
4249 _cleanup_(barrier_destroy
) Barrier barrier
= BARRIER_NULL
;
4250 _cleanup_(sd_event_source_unrefp
) sd_event_source
*notify_event_source
= NULL
;
4251 _cleanup_(sd_event_unrefp
) sd_event
*event
= NULL
;
4252 _cleanup_(pty_forward_freep
) PTYForward
*forward
= NULL
;
4253 _cleanup_(sd_netlink_unrefp
) sd_netlink
*rtnl
= NULL
;
4254 _cleanup_(sd_bus_flush_close_unrefp
) sd_bus
*bus
= NULL
;
4255 ContainerStatus container_status
= 0;
4259 _cleanup_close_
int child_netns_fd
= -1;
4261 assert_se(sigemptyset(&mask_chld
) == 0);
4262 assert_se(sigaddset(&mask_chld
, SIGCHLD
) == 0);
4264 if (arg_userns_mode
== USER_NAMESPACE_PICK
) {
4265 /* When we shall pick the UID/GID range, let's first lock /etc/passwd, so that we can safely
4266 * check with getpwuid() if the specific user already exists. Note that /etc might be
4267 * read-only, in which case this will fail with EROFS. But that's really OK, as in that case we
4268 * can be reasonably sure that no users are going to be added. Note that getpwuid() checks are
4269 * really just an extra safety net. We kinda assume that the UID range we allocate from is
4272 etc_passwd_lock
= take_etc_passwd_lock(NULL
);
4273 if (etc_passwd_lock
< 0 && etc_passwd_lock
!= -EROFS
)
4274 return log_error_errno(etc_passwd_lock
, "Failed to take /etc/passwd lock: %m");
4277 r
= barrier_create(&barrier
);
4279 return log_error_errno(r
, "Cannot initialize IPC barrier: %m");
4281 if (socketpair(AF_UNIX
, SOCK_SEQPACKET
|SOCK_CLOEXEC
, 0, kmsg_socket_pair
) < 0)
4282 return log_error_errno(errno
, "Failed to create kmsg socket pair: %m");
4284 if (socketpair(AF_UNIX
, SOCK_SEQPACKET
|SOCK_CLOEXEC
, 0, rtnl_socket_pair
) < 0)
4285 return log_error_errno(errno
, "Failed to create rtnl socket pair: %m");
4287 if (socketpair(AF_UNIX
, SOCK_SEQPACKET
|SOCK_CLOEXEC
, 0, pid_socket_pair
) < 0)
4288 return log_error_errno(errno
, "Failed to create pid socket pair: %m");
4290 if (socketpair(AF_UNIX
, SOCK_SEQPACKET
|SOCK_CLOEXEC
, 0, uuid_socket_pair
) < 0)
4291 return log_error_errno(errno
, "Failed to create id socket pair: %m");
4293 if (socketpair(AF_UNIX
, SOCK_SEQPACKET
|SOCK_CLOEXEC
, 0, notify_socket_pair
) < 0)
4294 return log_error_errno(errno
, "Failed to create notify socket pair: %m");
4296 if (socketpair(AF_UNIX
, SOCK_SEQPACKET
|SOCK_CLOEXEC
, 0, master_pty_socket_pair
) < 0)
4297 return log_error_errno(errno
, "Failed to create console socket pair: %m");
4299 if (arg_userns_mode
!= USER_NAMESPACE_NO
)
4300 if (socketpair(AF_UNIX
, SOCK_SEQPACKET
|SOCK_CLOEXEC
, 0, uid_shift_socket_pair
) < 0)
4301 return log_error_errno(errno
, "Failed to create uid shift socket pair: %m");
4303 if (arg_unified_cgroup_hierarchy
== CGROUP_UNIFIED_UNKNOWN
)
4304 if (socketpair(AF_UNIX
, SOCK_SEQPACKET
|SOCK_CLOEXEC
, 0, unified_cgroup_hierarchy_socket_pair
) < 0)
4305 return log_error_errno(errno
, "Failed to create unified cgroup socket pair: %m");
4307 /* Child can be killed before execv(), so handle SIGCHLD in order to interrupt
4308 * parent's blocking calls and give it a chance to call wait() and terminate. */
4309 r
= sigprocmask(SIG_UNBLOCK
, &mask_chld
, NULL
);
4311 return log_error_errno(errno
, "Failed to change the signal mask: %m");
4313 r
= sigaction(SIGCHLD
, &sa
, NULL
);
4315 return log_error_errno(errno
, "Failed to install SIGCHLD handler: %m");
4317 if (arg_network_namespace_path
) {
4318 child_netns_fd
= open(arg_network_namespace_path
, O_RDONLY
|O_NOCTTY
|O_CLOEXEC
);
4319 if (child_netns_fd
< 0)
4320 return log_error_errno(errno
, "Cannot open file %s: %m", arg_network_namespace_path
);
4322 r
= fd_is_network_ns(child_netns_fd
);
4324 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
);
4326 return log_error_errno(r
, "Failed to check %s fs type: %m", arg_network_namespace_path
);
4328 return log_error_errno(SYNTHETIC_ERRNO(EINVAL
),
4329 "Path %s doesn't refer to a network namespace, refusing.", arg_network_namespace_path
);
4332 *pid
= raw_clone(SIGCHLD
|CLONE_NEWNS
);
4334 return log_error_errno(errno
, "clone() failed%s: %m",
4336 ", do you have namespace support enabled in your kernel? (You need UTS, IPC, PID and NET namespacing built in)" : "");
4339 /* The outer child only has a file system namespace. */
4340 barrier_set_role(&barrier
, BARRIER_CHILD
);
4342 kmsg_socket_pair
[0] = safe_close(kmsg_socket_pair
[0]);
4343 rtnl_socket_pair
[0] = safe_close(rtnl_socket_pair
[0]);
4344 pid_socket_pair
[0] = safe_close(pid_socket_pair
[0]);
4345 uuid_socket_pair
[0] = safe_close(uuid_socket_pair
[0]);
4346 notify_socket_pair
[0] = safe_close(notify_socket_pair
[0]);
4347 master_pty_socket_pair
[0] = safe_close(master_pty_socket_pair
[0]);
4348 uid_shift_socket_pair
[0] = safe_close(uid_shift_socket_pair
[0]);
4349 unified_cgroup_hierarchy_socket_pair
[0] = safe_close(unified_cgroup_hierarchy_socket_pair
[0]);
4351 (void) reset_all_signal_handlers();
4352 (void) reset_signal_mask();
4354 r
= outer_child(&barrier
,
4359 uuid_socket_pair
[1],
4360 notify_socket_pair
[1],
4361 kmsg_socket_pair
[1],
4362 rtnl_socket_pair
[1],
4363 uid_shift_socket_pair
[1],
4364 master_pty_socket_pair
[1],
4365 unified_cgroup_hierarchy_socket_pair
[1],
4369 _exit(EXIT_FAILURE
);
4371 _exit(EXIT_SUCCESS
);
4374 barrier_set_role(&barrier
, BARRIER_PARENT
);
4378 kmsg_socket_pair
[1] = safe_close(kmsg_socket_pair
[1]);
4379 rtnl_socket_pair
[1] = safe_close(rtnl_socket_pair
[1]);
4380 pid_socket_pair
[1] = safe_close(pid_socket_pair
[1]);
4381 uuid_socket_pair
[1] = safe_close(uuid_socket_pair
[1]);
4382 notify_socket_pair
[1] = safe_close(notify_socket_pair
[1]);
4383 master_pty_socket_pair
[1] = safe_close(master_pty_socket_pair
[1]);
4384 uid_shift_socket_pair
[1] = safe_close(uid_shift_socket_pair
[1]);
4385 unified_cgroup_hierarchy_socket_pair
[1] = safe_close(unified_cgroup_hierarchy_socket_pair
[1]);
4387 if (arg_userns_mode
!= USER_NAMESPACE_NO
) {
4388 /* The child just let us know the UID shift it might have read from the image. */
4389 l
= recv(uid_shift_socket_pair
[0], &arg_uid_shift
, sizeof arg_uid_shift
, 0);
4391 return log_error_errno(errno
, "Failed to read UID shift: %m");
4392 if (l
!= sizeof arg_uid_shift
)
4393 return log_error_errno(SYNTHETIC_ERRNO(EIO
), "Short read while reading UID shift.");
4395 if (arg_userns_mode
== USER_NAMESPACE_PICK
) {
4396 /* If we are supposed to pick the UID shift, let's try to use the shift read from the
4397 * image, but if that's already in use, pick a new one, and report back to the child,
4398 * which one we now picked. */
4400 r
= uid_shift_pick(&arg_uid_shift
, &uid_shift_lock
);
4402 return log_error_errno(r
, "Failed to pick suitable UID/GID range: %m");
4404 l
= send(uid_shift_socket_pair
[0], &arg_uid_shift
, sizeof arg_uid_shift
, MSG_NOSIGNAL
);
4406 return log_error_errno(errno
, "Failed to send UID shift: %m");
4407 if (l
!= sizeof arg_uid_shift
)
4408 return log_error_errno(SYNTHETIC_ERRNO(EIO
), "Short write while writing UID shift.");
4412 if (arg_unified_cgroup_hierarchy
== CGROUP_UNIFIED_UNKNOWN
) {
4413 /* The child let us know the support cgroup mode it might have read from the image. */
4414 l
= recv(unified_cgroup_hierarchy_socket_pair
[0], &arg_unified_cgroup_hierarchy
, sizeof(arg_unified_cgroup_hierarchy
), 0);
4416 return log_error_errno(errno
, "Failed to read cgroup mode: %m");
4417 if (l
!= sizeof(arg_unified_cgroup_hierarchy
))
4418 return log_error_errno(SYNTHETIC_ERRNO(EIO
), "Short read while reading cgroup mode (%zu bytes).%s",
4419 l
, l
== 0 ? " The child is most likely dead." : "");
4422 /* Wait for the outer child. */
4423 r
= wait_for_terminate_and_check("(sd-namespace)", *pid
, WAIT_LOG_ABNORMAL
);
4426 if (r
!= EXIT_SUCCESS
)
4429 /* And now retrieve the PID of the inner child. */
4430 l
= recv(pid_socket_pair
[0], pid
, sizeof *pid
, 0);
4432 return log_error_errno(errno
, "Failed to read inner child PID: %m");
4433 if (l
!= sizeof *pid
)
4434 return log_error_errno(SYNTHETIC_ERRNO(EIO
), "Short read while reading inner child PID.");
4436 /* We also retrieve container UUID in case it was generated by outer child */
4437 l
= recv(uuid_socket_pair
[0], &arg_uuid
, sizeof arg_uuid
, 0);
4439 return log_error_errno(errno
, "Failed to read container machine ID: %m");
4440 if (l
!= sizeof(arg_uuid
))
4441 return log_error_errno(SYNTHETIC_ERRNO(EIO
), "Short read while reading container machined ID.");
4443 /* We also retrieve the socket used for notifications generated by outer child */
4444 notify_socket
= receive_one_fd(notify_socket_pair
[0], 0);
4445 if (notify_socket
< 0)
4446 return log_error_errno(notify_socket
,
4447 "Failed to receive notification socket from the outer child: %m");
4449 log_debug("Init process invoked as PID "PID_FMT
, *pid
);
4451 if (arg_userns_mode
!= USER_NAMESPACE_NO
) {
4452 if (!barrier_place_and_sync(&barrier
)) /* #1 */
4453 return log_error_errno(SYNTHETIC_ERRNO(ESRCH
), "Child died too early.");
4455 r
= setup_uid_map(*pid
);
4459 (void) barrier_place(&barrier
); /* #2 */
4462 if (arg_private_network
) {
4463 if (!arg_network_namespace_path
) {
4464 /* Wait until the child has unshared its network namespace. */
4465 if (!barrier_place_and_sync(&barrier
)) /* #3 */
4466 return log_error_errno(SYNTHETIC_ERRNO(ESRCH
), "Child died too early");
4469 if (child_netns_fd
< 0) {
4470 /* Make sure we have an open file descriptor to the child's network
4471 * namespace so it stays alive even if the child exits. */
4472 r
= namespace_open(*pid
, NULL
, NULL
, &child_netns_fd
, NULL
, NULL
);
4474 return log_error_errno(r
, "Failed to open child network namespace: %m");
4477 r
= move_network_interfaces(child_netns_fd
, arg_network_interfaces
);
4481 if (arg_network_veth
) {
4482 r
= setup_veth(arg_machine
, *pid
, veth_name
,
4483 arg_network_bridge
|| arg_network_zone
);
4489 if (arg_network_bridge
) {
4490 /* Add the interface to a bridge */
4491 r
= setup_bridge(veth_name
, arg_network_bridge
, false);
4496 } else if (arg_network_zone
) {
4497 /* Add the interface to a bridge, possibly creating it */
4498 r
= setup_bridge(veth_name
, arg_network_zone
, true);
4506 r
= setup_veth_extra(arg_machine
, *pid
, arg_network_veth_extra
);
4510 /* We created the primary and extra veth links now; let's remember this, so that we know to
4511 remove them later on. Note that we don't bother with removing veth links that were created
4512 here when their setup failed half-way, because in that case the kernel should be able to
4513 remove them on its own, since they cannot be referenced by anything yet. */
4514 *veth_created
= true;
4516 r
= setup_macvlan(arg_machine
, *pid
, arg_network_macvlan
);
4520 r
= setup_ipvlan(arg_machine
, *pid
, arg_network_ipvlan
);
4525 if (arg_register
|| !arg_keep_unit
) {
4526 r
= sd_bus_default_system(&bus
);
4528 return log_error_errno(r
, "Failed to open system bus: %m");
4530 r
= sd_bus_set_close_on_exit(bus
, false);
4532 return log_error_errno(r
, "Failed to disable close-on-exit behaviour: %m");
4535 if (!arg_keep_unit
) {
4536 /* When a new scope is created for this container, then we'll be registered as its controller, in which
4537 * case PID 1 will send us a friendly RequestStop signal, when it is asked to terminate the
4538 * scope. Let's hook into that, and cleanly shut down the container, and print a friendly message. */
4540 r
= sd_bus_match_signal_async(
4543 "org.freedesktop.systemd1",
4545 "org.freedesktop.systemd1.Scope",
4547 on_request_stop
, NULL
, PID_TO_PTR(*pid
));
4549 return log_error_errno(r
, "Failed to request RequestStop match: %m");
4553 r
= register_machine(
4561 arg_custom_mounts
, arg_n_custom_mounts
,
4564 arg_property_message
,
4566 arg_container_service_name
);
4570 } else if (!arg_keep_unit
) {
4576 arg_custom_mounts
, arg_n_custom_mounts
,
4579 arg_property_message
);
4583 } else if (arg_slice
|| arg_property
)
4584 log_notice("Machine and scope registration turned off, --slice= and --property= settings will have no effect.");
4586 r
= create_subcgroup(*pid
, arg_keep_unit
, arg_unified_cgroup_hierarchy
);
4590 r
= sync_cgroup(*pid
, arg_unified_cgroup_hierarchy
, arg_uid_shift
);
4594 r
= chown_cgroup(*pid
, arg_unified_cgroup_hierarchy
, arg_uid_shift
);
4598 /* Notify the child that the parent is ready with all
4599 * its setup (including cgroup-ification), and that
4600 * the child can now hand over control to the code to
4601 * run inside the container. */
4602 (void) barrier_place(&barrier
); /* #4 */
4604 /* Block SIGCHLD here, before notifying child.
4605 * process_pty() will handle it with the other signals. */
4606 assert_se(sigprocmask(SIG_BLOCK
, &mask_chld
, NULL
) >= 0);
4608 /* Reset signal to default */
4609 r
= default_signals(SIGCHLD
, -1);
4611 return log_error_errno(r
, "Failed to reset SIGCHLD: %m");
4613 r
= sd_event_new(&event
);
4615 return log_error_errno(r
, "Failed to get default event source: %m");
4617 (void) sd_event_set_watchdog(event
, true);
4620 r
= sd_bus_attach_event(bus
, event
, 0);
4622 return log_error_errno(r
, "Failed to attach bus to event loop: %m");
4625 r
= setup_sd_notify_parent(event
, notify_socket
, PID_TO_PTR(*pid
), ¬ify_event_source
);
4629 /* Let the child know that we are ready and wait that the child is completely ready now. */
4630 if (!barrier_place_and_sync(&barrier
)) /* #5 */
4631 return log_error_errno(SYNTHETIC_ERRNO(ESRCH
), "Child died too early.");
4633 /* At this point we have made use of the UID we picked, and thus nss-mymachines
4634 * will make them appear in getpwuid(), thus we can release the /etc/passwd lock. */
4635 etc_passwd_lock
= safe_close(etc_passwd_lock
);
4637 (void) sd_notifyf(false,
4638 "STATUS=Container running.\n"
4639 "X_NSPAWN_LEADER_PID=" PID_FMT
, *pid
);
4640 if (!arg_notify_ready
)
4641 (void) sd_notify(false, "READY=1\n");
4643 if (arg_kill_signal
> 0) {
4644 /* Try to kill the init system on SIGINT or SIGTERM */
4645 (void) sd_event_add_signal(event
, NULL
, SIGINT
, on_orderly_shutdown
, PID_TO_PTR(*pid
));
4646 (void) sd_event_add_signal(event
, NULL
, SIGTERM
, on_orderly_shutdown
, PID_TO_PTR(*pid
));
4648 /* Immediately exit */
4649 (void) sd_event_add_signal(event
, NULL
, SIGINT
, NULL
, NULL
);
4650 (void) sd_event_add_signal(event
, NULL
, SIGTERM
, NULL
, NULL
);
4653 /* Exit when the child exits */
4654 (void) sd_event_add_signal(event
, NULL
, SIGCHLD
, on_sigchld
, PID_TO_PTR(*pid
));
4656 if (arg_expose_ports
) {
4657 r
= expose_port_watch_rtnl(event
, rtnl_socket_pair
[0], on_address_change
, exposed
, &rtnl
);
4661 (void) expose_port_execute(rtnl
, arg_expose_ports
, exposed
);
4664 rtnl_socket_pair
[0] = safe_close(rtnl_socket_pair
[0]);
4666 if (arg_console_mode
!= CONSOLE_PIPE
) {
4667 _cleanup_close_
int fd
= -1;
4668 PTYForwardFlags flags
= 0;
4670 /* Retrieve the master pty allocated by inner child */
4671 fd
= receive_one_fd(master_pty_socket_pair
[0], 0);
4673 return log_error_errno(fd
, "Failed to receive master pty from the inner child: %m");
4675 switch (arg_console_mode
) {
4677 case CONSOLE_READ_ONLY
:
4678 flags
|= PTY_FORWARD_READ_ONLY
;
4682 case CONSOLE_INTERACTIVE
:
4683 flags
|= PTY_FORWARD_IGNORE_VHANGUP
;
4685 r
= pty_forward_new(event
, fd
, flags
, &forward
);
4687 return log_error_errno(r
, "Failed to create PTY forwarder: %m");
4689 if (arg_console_width
!= (unsigned) -1 || arg_console_height
!= (unsigned) -1)
4690 (void) pty_forward_set_width_height(forward
,
4692 arg_console_height
);
4696 assert(arg_console_mode
== CONSOLE_PASSIVE
);
4699 *master
= TAKE_FD(fd
);
4702 r
= sd_event_loop(event
);
4704 return log_error_errno(r
, "Failed to run event loop: %m");
4709 (void) pty_forward_get_last_char(forward
, &last_char
);
4710 forward
= pty_forward_free(forward
);
4712 if (!arg_quiet
&& last_char
!= '\n')
4716 /* Kill if it is not dead yet anyway */
4717 if (!arg_register
&& !arg_keep_unit
&& bus
)
4718 terminate_scope(bus
, arg_machine
);
4720 /* Normally redundant, but better safe than sorry */
4721 (void) kill(*pid
, SIGKILL
);
4723 if (arg_private_network
) {
4724 /* Move network interfaces back to the parent network namespace. We use `safe_fork`
4725 * to avoid having to move the parent to the child network namespace. */
4726 r
= safe_fork(NULL
, FORK_RESET_SIGNALS
|FORK_DEATHSIG
|FORK_WAIT
|FORK_LOG
, NULL
);
4731 _cleanup_close_
int parent_netns_fd
= -1;
4733 r
= namespace_open(getpid(), NULL
, NULL
, &parent_netns_fd
, NULL
, NULL
);
4735 log_error_errno(r
, "Failed to open parent network namespace: %m");
4736 _exit(EXIT_FAILURE
);
4739 r
= namespace_enter(-1, -1, child_netns_fd
, -1, -1);
4741 log_error_errno(r
, "Failed to enter child network namespace: %m");
4742 _exit(EXIT_FAILURE
);
4745 r
= move_network_interfaces(parent_netns_fd
, arg_network_interfaces
);
4747 log_error_errno(r
, "Failed to move network interfaces back to parent network namespace: %m");
4749 _exit(r
< 0 ? EXIT_FAILURE
: EXIT_SUCCESS
);
4753 r
= wait_for_container(*pid
, &container_status
);
4756 /* Tell machined that we are gone. */
4758 (void) unregister_machine(bus
, arg_machine
);
4761 /* We failed to wait for the container, or the container exited abnormally. */
4763 if (r
> 0 || container_status
== CONTAINER_TERMINATED
) {
4764 /* r > 0 → The container exited with a non-zero status.
4765 * As a special case, we need to replace 133 with a different value,
4766 * because 133 is special-cased in the service file to reboot the container.
4767 * otherwise → The container exited with zero status and a reboot was not requested.
4769 if (r
== EXIT_FORCE_RESTART
)
4770 r
= EXIT_FAILURE
; /* replace 133 with the general failure code */
4772 return 0; /* finito */
4775 /* CONTAINER_REBOOTED, loop again */
4777 if (arg_keep_unit
) {
4778 /* Special handling if we are running as a service: instead of simply
4779 * restarting the machine we want to restart the entire service, so let's
4780 * inform systemd about this with the special exit code 133. The service
4781 * file uses RestartForceExitStatus=133 so that this results in a full
4782 * nspawn restart. This is necessary since we might have cgroup parameters
4783 * set we want to have flushed out. */
4784 *ret
= EXIT_FORCE_RESTART
;
4785 return 0; /* finito */
4788 expose_port_flush(arg_expose_ports
, exposed
);
4790 (void) remove_veth_links(veth_name
, arg_network_veth_extra
);
4791 *veth_created
= false;
4792 return 1; /* loop again */
4795 static int initialize_rlimits(void) {
4796 /* The default resource limits the kernel passes to PID 1, as per kernel 4.16. Let's pass our container payload
4797 * the same values as the kernel originally passed to PID 1, in order to minimize differences between host and
4798 * container execution environments. */
4800 static const struct rlimit kernel_defaults
[_RLIMIT_MAX
] = {
4801 [RLIMIT_AS
] = { RLIM_INFINITY
, RLIM_INFINITY
},
4802 [RLIMIT_CORE
] = { 0, RLIM_INFINITY
},
4803 [RLIMIT_CPU
] = { RLIM_INFINITY
, RLIM_INFINITY
},
4804 [RLIMIT_DATA
] = { RLIM_INFINITY
, RLIM_INFINITY
},
4805 [RLIMIT_FSIZE
] = { RLIM_INFINITY
, RLIM_INFINITY
},
4806 [RLIMIT_LOCKS
] = { RLIM_INFINITY
, RLIM_INFINITY
},
4807 [RLIMIT_MEMLOCK
] = { 65536, 65536 },
4808 [RLIMIT_MSGQUEUE
] = { 819200, 819200 },
4809 [RLIMIT_NICE
] = { 0, 0 },
4810 [RLIMIT_NOFILE
] = { 1024, 4096 },
4811 [RLIMIT_RSS
] = { RLIM_INFINITY
, RLIM_INFINITY
},
4812 [RLIMIT_RTPRIO
] = { 0, 0 },
4813 [RLIMIT_RTTIME
] = { RLIM_INFINITY
, RLIM_INFINITY
},
4814 [RLIMIT_STACK
] = { 8388608, RLIM_INFINITY
},
4816 /* The kernel scales the default for RLIMIT_NPROC and RLIMIT_SIGPENDING based on the system's amount of
4817 * RAM. To provide best compatibility we'll read these limits off PID 1 instead of hardcoding them
4818 * here. This is safe as we know that PID 1 doesn't change these two limits and thus the original
4819 * kernel's initialization should still be valid during runtime — at least if PID 1 is systemd. Note
4820 * that PID 1 changes a number of other resource limits during early initialization which is why we
4821 * don't read the other limits from PID 1 but prefer the static table above. */
4826 for (rl
= 0; rl
< _RLIMIT_MAX
; rl
++) {
4827 /* Let's only fill in what the user hasn't explicitly configured anyway */
4828 if ((arg_settings_mask
& (SETTING_RLIMIT_FIRST
<< rl
)) == 0) {
4829 const struct rlimit
*v
;
4830 struct rlimit buffer
;
4832 if (IN_SET(rl
, RLIMIT_NPROC
, RLIMIT_SIGPENDING
)) {
4833 /* For these two let's read the limits off PID 1. See above for an explanation. */
4835 if (prlimit(1, rl
, NULL
, &buffer
) < 0)
4836 return log_error_errno(errno
, "Failed to read resource limit RLIMIT_%s of PID 1: %m", rlimit_to_string(rl
));
4840 v
= kernel_defaults
+ rl
;
4842 arg_rlimit
[rl
] = newdup(struct rlimit
, v
, 1);
4843 if (!arg_rlimit
[rl
])
4847 if (DEBUG_LOGGING
) {
4848 _cleanup_free_
char *k
= NULL
;
4850 (void) rlimit_format(arg_rlimit
[rl
], &k
);
4851 log_debug("Setting RLIMIT_%s to %s.", rlimit_to_string(rl
), k
);
4858 static int cant_be_in_netns(void) {
4859 union sockaddr_union sa
= {
4861 .sun_family
= AF_UNIX
,
4862 .sun_path
= "/run/udev/control",
4865 char udev_path
[STRLEN("/proc//ns/net") + DECIMAL_STR_MAX(pid_t
)];
4866 _cleanup_free_
char *udev_ns
= NULL
, *our_ns
= NULL
;
4867 _cleanup_close_
int fd
= -1;
4871 /* Check if we are in the same netns as udev. If we aren't, then device monitoring (and thus waiting
4872 * for loopback block devices) won't work, and we will hang. Detect this case and exit early with a
4875 if (!arg_image
) /* only matters if --image= us used, i.e. we actually need to use loopback devices */
4878 fd
= socket(AF_UNIX
, SOCK_SEQPACKET
|SOCK_NONBLOCK
|SOCK_CLOEXEC
, 0);
4880 return log_error_errno(errno
, "Failed to allocate udev control socket: %m");
4882 if (connect(fd
, &sa
.un
, SOCKADDR_UN_LEN(sa
.un
)) < 0) {
4884 if (errno
== ENOENT
|| ERRNO_IS_DISCONNECT(errno
))
4885 return log_error_errno(SYNTHETIC_ERRNO(EOPNOTSUPP
),
4886 "Sorry, but --image= requires access to the host's /run/ hierarchy, since we need access to udev.");
4888 return log_error_errno(errno
, "Failed to connect socket to udev control socket: %m");
4891 r
= getpeercred(fd
, &ucred
);
4893 return log_error_errno(r
, "Failed to determine peer of udev control socket: %m");
4895 xsprintf(udev_path
, "/proc/" PID_FMT
"/ns/net", ucred
.pid
);
4896 r
= readlink_malloc(udev_path
, &udev_ns
);
4898 return log_error_errno(r
, "Failed to read network namespace of udev: %m");
4900 r
= readlink_malloc("/proc/self/ns/net", &our_ns
);
4902 return log_error_errno(r
, "Failed to read our own network namespace: %m");
4904 if (!streq(our_ns
, udev_ns
))
4905 return log_error_errno(SYNTHETIC_ERRNO(EOPNOTSUPP
),
4906 "Sorry, but --image= is only supported in the main network namespace, since we need access to udev/AF_NETLINK.");
4910 static int run(int argc
, char *argv
[]) {
4911 bool secondary
= false, remove_directory
= false, remove_image
= false,
4912 veth_created
= false, remove_tmprootdir
= false;
4913 _cleanup_close_
int master
= -1;
4914 _cleanup_fdset_free_ FDSet
*fds
= NULL
;
4915 int r
, n_fd_passed
, ret
= EXIT_SUCCESS
;
4916 char veth_name
[IFNAMSIZ
] = "";
4917 union in_addr_union exposed
= {};
4918 _cleanup_(release_lock_file
) LockFile tree_global_lock
= LOCK_FILE_INIT
, tree_local_lock
= LOCK_FILE_INIT
;
4919 char tmprootdir
[] = "/tmp/nspawn-root-XXXXXX";
4920 _cleanup_(loop_device_unrefp
) LoopDevice
*loop
= NULL
;
4921 _cleanup_(decrypted_image_unrefp
) DecryptedImage
*decrypted_image
= NULL
;
4922 _cleanup_(dissected_image_unrefp
) DissectedImage
*dissected_image
= NULL
;
4925 log_parse_environment();
4928 r
= parse_argv(argc
, argv
);
4936 r
= cant_be_in_netns();
4940 r
= initialize_rlimits();
4944 r
= load_oci_bundle();
4948 r
= determine_names();
4952 r
= load_settings();
4958 log_error_errno(r
, "Failed to determine whether the unified cgroups hierarchy is used: %m");
4962 r
= verify_arguments();
4966 /* Reapply environment settings. */
4967 (void) detect_unified_cgroup_hierarchy_from_environment();
4969 /* Ignore SIGPIPE here, because we use splice() on the ptyfwd stuff and that will generate SIGPIPE if
4970 * the result is closed. Note that the container payload child will reset signal mask+handler anyway,
4971 * so just turning this off here means we only turn it off in nspawn itself, not any children. */
4972 (void) ignore_signals(SIGPIPE
, -1);
4974 n_fd_passed
= sd_listen_fds(false);
4975 if (n_fd_passed
> 0) {
4976 r
= fdset_new_listen_fds(&fds
, false);
4978 log_error_errno(r
, "Failed to collect file descriptors: %m");
4983 /* The "default" umask. This is appropriate for most file and directory
4984 * operations performed by nspawn, and is the umask that will be used for
4985 * the child. Functions like copy_devnodes() change the umask temporarily. */
4988 if (arg_directory
) {
4991 /* Safety precaution: let's not allow running images from the live host OS image, as long as
4992 * /var from the host will propagate into container dynamically (because bad things happen if
4993 * two systems write to the same /var). Let's allow it for the special cases where /var is
4994 * either copied (i.e. --ephemeral) or replaced (i.e. --volatile=yes|state). */
4995 if (path_equal(arg_directory
, "/") && !(arg_ephemeral
|| IN_SET(arg_volatile_mode
, VOLATILE_YES
, VOLATILE_STATE
))) {
4996 log_error("Spawning container on root directory is not supported. Consider using --ephemeral, --volatile=yes or --volatile=state.");
5001 if (arg_ephemeral
) {
5002 _cleanup_free_
char *np
= NULL
;
5004 r
= chase_symlinks_and_update(&arg_directory
, 0);
5008 /* If the specified path is a mount point we generate the new snapshot immediately
5009 * inside it under a random name. However if the specified is not a mount point we
5010 * create the new snapshot in the parent directory, just next to it. */
5011 r
= path_is_mount_point(arg_directory
, NULL
, 0);
5013 log_error_errno(r
, "Failed to determine whether directory %s is mount point: %m", arg_directory
);
5017 r
= tempfn_random_child(arg_directory
, "machine.", &np
);
5019 r
= tempfn_random(arg_directory
, "machine.", &np
);
5021 log_error_errno(r
, "Failed to generate name for directory snapshot: %m");
5025 /* We take an exclusive lock on this image, since it's our private, ephemeral copy
5026 * only owned by us and no one else. */
5027 r
= image_path_lock(np
, LOCK_EX
|LOCK_NB
, &tree_global_lock
, &tree_local_lock
);
5029 log_error_errno(r
, "Failed to lock %s: %m", np
);
5034 BLOCK_SIGNALS(SIGINT
);
5035 r
= btrfs_subvol_snapshot(arg_directory
, np
,
5036 (arg_read_only
? BTRFS_SNAPSHOT_READ_ONLY
: 0) |
5037 BTRFS_SNAPSHOT_FALLBACK_COPY
|
5038 BTRFS_SNAPSHOT_FALLBACK_DIRECTORY
|
5039 BTRFS_SNAPSHOT_RECURSIVE
|
5040 BTRFS_SNAPSHOT_QUOTA
|
5041 BTRFS_SNAPSHOT_SIGINT
);
5044 log_error_errno(r
, "Interrupted while copying file system tree to %s, removed again.", np
);
5048 log_error_errno(r
, "Failed to create snapshot %s from %s: %m", np
, arg_directory
);
5052 free_and_replace(arg_directory
, np
);
5053 remove_directory
= true;
5055 r
= chase_symlinks_and_update(&arg_directory
, arg_template
? CHASE_NONEXISTENT
: 0);
5059 r
= image_path_lock(arg_directory
, (arg_read_only
? LOCK_SH
: LOCK_EX
) | LOCK_NB
, &tree_global_lock
, &tree_local_lock
);
5061 log_error_errno(r
, "Directory tree %s is currently busy.", arg_directory
);
5065 log_error_errno(r
, "Failed to lock %s: %m", arg_directory
);
5070 r
= chase_symlinks_and_update(&arg_template
, 0);
5075 BLOCK_SIGNALS(SIGINT
);
5076 r
= btrfs_subvol_snapshot(arg_template
, arg_directory
,
5077 (arg_read_only
? BTRFS_SNAPSHOT_READ_ONLY
: 0) |
5078 BTRFS_SNAPSHOT_FALLBACK_COPY
|
5079 BTRFS_SNAPSHOT_FALLBACK_DIRECTORY
|
5080 BTRFS_SNAPSHOT_FALLBACK_IMMUTABLE
|
5081 BTRFS_SNAPSHOT_RECURSIVE
|
5082 BTRFS_SNAPSHOT_QUOTA
|
5083 BTRFS_SNAPSHOT_SIGINT
);
5086 log_full(arg_quiet
? LOG_DEBUG
: LOG_INFO
,
5087 "Directory %s already exists, not populating from template %s.", arg_directory
, arg_template
);
5088 else if (r
== -EINTR
) {
5089 log_error_errno(r
, "Interrupted while copying file system tree to %s, removed again.", arg_directory
);
5092 log_error_errno(r
, "Couldn't create snapshot %s from %s: %m", arg_directory
, arg_template
);
5095 log_full(arg_quiet
? LOG_DEBUG
: LOG_INFO
,
5096 "Populated %s from template %s.", arg_directory
, arg_template
);
5100 if (arg_start_mode
== START_BOOT
) {
5103 if (arg_pivot_root_new
)
5104 p
= prefix_roota(arg_directory
, arg_pivot_root_new
);
5108 if (path_is_os_tree(p
) <= 0) {
5109 log_error("Directory %s doesn't look like an OS root directory (os-release file is missing). Refusing.", p
);
5116 if (arg_pivot_root_new
)
5117 p
= prefix_roota(arg_directory
, arg_pivot_root_new
);
5121 q
= strjoina(p
, "/usr/");
5123 if (laccess(q
, F_OK
) < 0) {
5124 log_error("Directory %s doesn't look like it has an OS tree. Refusing.", p
);
5131 DissectImageFlags dissect_image_flags
= DISSECT_IMAGE_REQUIRE_ROOT
| DISSECT_IMAGE_RELAX_VAR_CHECK
;
5133 assert(!arg_template
);
5135 r
= chase_symlinks_and_update(&arg_image
, 0);
5139 if (arg_ephemeral
) {
5140 _cleanup_free_
char *np
= NULL
;
5142 r
= tempfn_random(arg_image
, "machine.", &np
);
5144 log_error_errno(r
, "Failed to generate name for image snapshot: %m");
5148 /* Always take an exclusive lock on our own ephemeral copy. */
5149 r
= image_path_lock(np
, LOCK_EX
|LOCK_NB
, &tree_global_lock
, &tree_local_lock
);
5151 r
= log_error_errno(r
, "Failed to create image lock: %m");
5156 BLOCK_SIGNALS(SIGINT
);
5157 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
);
5160 log_error_errno(r
, "Interrupted while copying image file to %s, removed again.", np
);
5164 r
= log_error_errno(r
, "Failed to copy image file: %m");
5168 free_and_replace(arg_image
, np
);
5169 remove_image
= true;
5171 r
= image_path_lock(arg_image
, (arg_read_only
? LOCK_SH
: LOCK_EX
) | LOCK_NB
, &tree_global_lock
, &tree_local_lock
);
5173 r
= log_error_errno(r
, "Disk image %s is currently busy.", arg_image
);
5177 r
= log_error_errno(r
, "Failed to create image lock: %m");
5181 r
= verity_metadata_load(arg_image
, NULL
, arg_root_hash
? NULL
: &arg_root_hash
, &arg_root_hash_size
,
5182 arg_verity_data
? NULL
: &arg_verity_data
,
5183 arg_root_hash_sig_path
|| arg_root_hash_sig
? NULL
: &arg_root_hash_sig_path
);
5185 log_error_errno(r
, "Failed to read verity artefacts for %s: %m", arg_image
);
5188 dissect_image_flags
|= arg_verity_data
? DISSECT_IMAGE_NO_PARTITION_TABLE
: 0;
5191 if (!mkdtemp(tmprootdir
)) {
5192 r
= log_error_errno(errno
, "Failed to create temporary directory: %m");
5196 remove_tmprootdir
= true;
5198 arg_directory
= strdup(tmprootdir
);
5199 if (!arg_directory
) {
5204 r
= loop_device_make_by_path(arg_image
, arg_read_only
? O_RDONLY
: O_RDWR
, LO_FLAGS_PARTSCAN
, &loop
);
5206 log_error_errno(r
, "Failed to set up loopback block device: %m");
5210 r
= dissect_image_and_warn(
5213 arg_root_hash
, arg_root_hash_size
,
5215 dissect_image_flags
,
5218 /* dissected_image_and_warn() already printed a brief error message. Extend on that with more details */
5219 log_notice("Note that the disk image needs to\n"
5220 " a) either contain only a single MBR partition of type 0x83 that is marked bootable\n"
5221 " b) or contain a single GPT partition of type 0FC63DAF-8483-4772-8E79-3D69D8477DE4\n"
5222 " c) or follow https://systemd.io/DISCOVERABLE_PARTITIONS\n"
5223 " d) or contain a file system without a partition table\n"
5224 "in order to be bootable with systemd-nspawn.");
5230 if (!arg_root_hash
&& dissected_image
->can_verity
)
5231 log_notice("Note: image %s contains verity information, but no root hash specified! Proceeding without integrity checking.", arg_image
);
5233 r
= dissected_image_decrypt_interactively(dissected_image
, NULL
, arg_root_hash
, arg_root_hash_size
, arg_verity_data
, arg_root_hash_sig_path
, arg_root_hash_sig
, arg_root_hash_sig_size
, 0, &decrypted_image
);
5237 /* Now that we mounted the image, let's try to remove it again, if it is ephemeral */
5238 if (remove_image
&& unlink(arg_image
) >= 0)
5239 remove_image
= false;
5242 r
= custom_mount_prepare_all(arg_directory
, arg_custom_mounts
, arg_n_custom_mounts
);
5246 if (arg_console_mode
< 0)
5248 isatty(STDIN_FILENO
) > 0 &&
5249 isatty(STDOUT_FILENO
) > 0 ? CONSOLE_INTERACTIVE
: CONSOLE_READ_ONLY
;
5251 if (arg_console_mode
== CONSOLE_PIPE
) /* if we pass STDERR on to the container, don't add our own logs into it too */
5255 log_info("Spawning container %s on %s.\nPress ^] three times within 1s to kill container.",
5256 arg_machine
, arg_image
?: arg_directory
);
5258 assert_se(sigprocmask_many(SIG_BLOCK
, NULL
, SIGCHLD
, SIGWINCH
, SIGTERM
, SIGINT
, -1) >= 0);
5260 if (prctl(PR_SET_CHILD_SUBREAPER
, 1, 0, 0, 0) < 0) {
5261 r
= log_error_errno(errno
, "Failed to become subreaper: %m");
5266 r
= run_container(dissected_image
,
5269 veth_name
, &veth_created
,
5277 (void) sd_notify(false,
5278 r
== 0 && ret
== EXIT_FORCE_RESTART
? "STOPPING=1\nSTATUS=Restarting..." :
5279 "STOPPING=1\nSTATUS=Terminating...");
5282 (void) kill(pid
, SIGKILL
);
5284 /* Try to flush whatever is still queued in the pty */
5286 (void) copy_bytes(master
, STDOUT_FILENO
, (uint64_t) -1, 0);
5287 master
= safe_close(master
);
5291 (void) wait_for_terminate(pid
, NULL
);
5295 if (remove_directory
&& arg_directory
) {
5298 k
= rm_rf(arg_directory
, REMOVE_ROOT
|REMOVE_PHYSICAL
|REMOVE_SUBVOLUME
);
5300 log_warning_errno(k
, "Cannot remove '%s', ignoring: %m", arg_directory
);
5303 if (remove_image
&& arg_image
) {
5304 if (unlink(arg_image
) < 0)
5305 log_warning_errno(errno
, "Can't remove image file '%s', ignoring: %m", arg_image
);
5308 if (remove_tmprootdir
) {
5309 if (rmdir(tmprootdir
) < 0)
5310 log_debug_errno(errno
, "Can't remove temporary root directory '%s', ignoring: %m", tmprootdir
);
5316 p
= strjoina("/run/systemd/nspawn/propagate/", arg_machine
);
5317 (void) rm_rf(p
, REMOVE_ROOT
);
5320 expose_port_flush(arg_expose_ports
, &exposed
);
5323 (void) remove_veth_links(veth_name
, arg_network_veth_extra
);
5324 (void) remove_bridge(arg_network_zone
);
5326 custom_mount_free_all(arg_custom_mounts
, arg_n_custom_mounts
);
5327 expose_port_free_all(arg_expose_ports
);
5328 rlimit_free_all(arg_rlimit
);
5329 device_node_array_free(arg_extra_nodes
, arg_n_extra_nodes
);
5337 DEFINE_MAIN_FUNCTION_WITH_POSITIVE_FAILURE(run
);