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nspawn: make use of openpt_allocate()
[thirdparty/systemd.git] / src / nspawn / nspawn.c
CommitLineData
53e1b683 1/* SPDX-License-Identifier: LGPL-2.1+ */
88213476 2
349cc4a5 3#if HAVE_BLKID
6b5cf3ea 4#include <blkid.h>
8fe0087e 5#endif
88213476 6#include <errno.h>
88213476 7#include <getopt.h>
0e7ac751 8#include <grp.h>
503f480f 9#include <linux/fs.h>
1b9e5b12 10#include <linux/loop.h>
0e7ac751 11#include <pwd.h>
8fe0087e 12#include <sched.h>
349cc4a5 13#if HAVE_SELINUX
8fe0087e 14#include <selinux/selinux.h>
1b9e5b12 15#endif
8fe0087e
LP		 16#include <signal.h>
17#include <stdio.h>
18#include <stdlib.h>
19#include <string.h>
20#include <sys/file.h>
8fe0087e
LP		 21#include <sys/personality.h>
22#include <sys/prctl.h>
23#include <sys/types.h>
6916b164 24#include <sys/wait.h>
8fe0087e 25#include <unistd.h>
1b9e5b12 26
b053cd5f 27#include "sd-bus.h"
1f0cd86b 28#include "sd-daemon.h"
1f0cd86b 29#include "sd-id128.h"
8fe0087e 30
b5efdb8a 31#include "alloc-util.h"
8fe0087e
LP		 32#include "barrier.h"
33#include "base-filesystem.h"
34#include "blkid-util.h"
35#include "btrfs-util.h"
b8ea7a6e 36#include "bus-error.h"
b053cd5f 37#include "bus-util.h"
8fe0087e 38#include "cap-list.h"
430f0182 39#include "capability-util.h"
04d391da 40#include "cgroup-util.h"
8fe0087e 41#include "copy.h"
d107bb7d 42#include "cpu-set-util.h"
4fc9982c 43#include "dev-setup.h"
2d845785 44#include "dissect-image.h"
8fe0087e 45#include "env-util.h"
3ffd4af2 46#include "fd-util.h"
842f3b0f 47#include "fdset.h"
a5c32cff 48#include "fileio.h"
f97b34a6 49#include "format-util.h"
f4f15635 50#include "fs-util.h"
1b9e5b12 51#include "gpt.h"
4623e8e6 52#include "hexdecoct.h"
8fe0087e 53#include "hostname-util.h"
910fd145 54#include "id128-util.h"
8fe0087e 55#include "log.h"
2d845785 56#include "loop-util.h"
8fe0087e 57#include "loopback-setup.h"
1b9cebf6 58#include "machine-image.h"
8fe0087e 59#include "macro.h"
44dbef90 60#include "main-func.h"
8fe0087e
LP		 61#include "missing.h"
62#include "mkdir.h"
4349cd7c 63#include "mount-util.h"
049af8ad 64#include "mountpoint-util.h"
0cb8e3d1 65#include "namespace-util.h"
8fe0087e 66#include "netlink-util.h"
07630cea 67#include "nspawn-cgroup.h"
3603efde 68#include "nspawn-def.h"
07630cea
LP		 69#include "nspawn-expose-ports.h"
70#include "nspawn-mount.h"
71#include "nspawn-network.h"
de40a303 72#include "nspawn-oci.h"
7336138e 73#include "nspawn-patch-uid.h"
07630cea 74#include "nspawn-register.h"
910fd145 75#include "nspawn-seccomp.h"
07630cea
LP		 76#include "nspawn-settings.h"
77#include "nspawn-setuid.h"
7732f92b 78#include "nspawn-stub-pid1.h"
d8b4d14d 79#include "nulstr-util.h"
d58ad743 80#include "os-util.h"
50ebcf6c 81#include "pager.h"
6bedfcbb 82#include "parse-util.h"
8fe0087e 83#include "path-util.h"
294bf0c3 84#include "pretty-print.h"
0b452006 85#include "process-util.h"
8fe0087e
LP		 86#include "ptyfwd.h"
87#include "random-util.h"
8869a0b4 88#include "raw-clone.h"
bf428efb 89#include "rlimit-util.h"
8fe0087e 90#include "rm-rf.h"
de40a303
LP		 91#if HAVE_SECCOMP
92#include "seccomp-util.h"
93#endif
68b02049 94#include "selinux-util.h"
8fe0087e 95#include "signal-util.h"
2583fbea 96#include "socket-util.h"
8fcde012 97#include "stat-util.h"
15a5e950 98#include "stdio-util.h"
5c828e66 99#include "string-table.h"
07630cea 100#include "string-util.h"
8fe0087e 101#include "strv.h"
de40a303 102#include "sysctl-util.h"
8fe0087e 103#include "terminal-util.h"
e4de7287 104#include "tmpfile-util.h"
affb60b1 105#include "umask-util.h"
b1d4f8e1 106#include "user-util.h"
8fe0087e 107#include "util.h"
e9642be2 108
62b1e758
YW		 109#if HAVE_SPLIT_USR
110#define STATIC_RESOLV_CONF "/lib/systemd/resolv.conf"
111#else
112#define STATIC_RESOLV_CONF "/usr/lib/systemd/resolv.conf"
113#endif
114
9c1e04d0
AP		 115/* nspawn is listening on the socket at the path in the constant nspawn_notify_socket_path
116 * nspawn_notify_socket_path is relative to the container
117 * the init process in the container pid can send messages to nspawn following the sd_notify(3) protocol */
118#define NSPAWN_NOTIFY_SOCKET_PATH "/run/systemd/nspawn/notify"
0e7ac751 119
2a49b612
ZJS		 120#define EXIT_FORCE_RESTART 133
121
113cea80
DH		 122typedef enum ContainerStatus {
123 CONTAINER_TERMINATED,
6145bb4f 124 CONTAINER_REBOOTED,
113cea80
DH		 125} ContainerStatus;
126
88213476 127static char *arg_directory = NULL;
ec16945e 128static char *arg_template = NULL;
5f932eb9 129static char *arg_chdir = NULL;
b53ede69
PW		 130static char *arg_pivot_root_new = NULL;
131static char *arg_pivot_root_old = NULL;
687d0825 132static char *arg_user = NULL;
de40a303
LP		 133static uid_t arg_uid = UID_INVALID;
134static gid_t arg_gid = GID_INVALID;
135static gid_t* arg_supplementary_gids = NULL;
136static size_t arg_n_supplementary_gids = 0;
9444b1f2 137static sd_id128_t arg_uuid = {};
3a9530e5
LP		 138static char *arg_machine = NULL; /* The name used by the host to refer to this */
139static char *arg_hostname = NULL; /* The name the payload sees by default */
c74e630d
LP		 140static const char *arg_selinux_context = NULL;
141static const char *arg_selinux_apifs_context = NULL;
de40a303 142static char *arg_slice = NULL;
ff01d048 143static bool arg_private_network = false;
bc2f673e 144static bool arg_read_only = false;
7732f92b 145static StartMode arg_start_mode = START_PID1;
ec16945e 146static bool arg_ephemeral = false;
57fb9fb5 147static LinkJournal arg_link_journal = LINK_AUTO;
574edc90 148static bool arg_link_journal_try = false;
520e0d54 149static uint64_t arg_caps_retain =
50b52222
LP		 150 (1ULL << CAP_AUDIT_CONTROL) |
151 (1ULL << CAP_AUDIT_WRITE) |
5076f0cc
LP		 152 (1ULL << CAP_CHOWN) |
153 (1ULL << CAP_DAC_OVERRIDE) |
154 (1ULL << CAP_DAC_READ_SEARCH) |
155 (1ULL << CAP_FOWNER) |
156 (1ULL << CAP_FSETID) |
157 (1ULL << CAP_IPC_OWNER) |
158 (1ULL << CAP_KILL) |
159 (1ULL << CAP_LEASE) |
160 (1ULL << CAP_LINUX_IMMUTABLE) |
50b52222 161 (1ULL << CAP_MKNOD) |
5076f0cc
LP		 162 (1ULL << CAP_NET_BIND_SERVICE) |
163 (1ULL << CAP_NET_BROADCAST) |
164 (1ULL << CAP_NET_RAW) |
5076f0cc 165 (1ULL << CAP_SETFCAP) |
50b52222 166 (1ULL << CAP_SETGID) |
5076f0cc
LP		 167 (1ULL << CAP_SETPCAP) |
168 (1ULL << CAP_SETUID) |
169 (1ULL << CAP_SYS_ADMIN) |
50b52222 170 (1ULL << CAP_SYS_BOOT) |
5076f0cc
LP		 171 (1ULL << CAP_SYS_CHROOT) |
172 (1ULL << CAP_SYS_NICE) |
173 (1ULL << CAP_SYS_PTRACE) |
d87be9b0 174 (1ULL << CAP_SYS_RESOURCE) |
50b52222 175 (1ULL << CAP_SYS_TTY_CONFIG);
de40a303 176static CapabilityQuintet arg_full_capabilities = CAPABILITY_QUINTET_NULL;
5a8af538 177static CustomMount *arg_custom_mounts = NULL;
88614c8a 178static size_t arg_n_custom_mounts = 0;
f4889f65 179static char **arg_setenv = NULL;
284c0b91 180static bool arg_quiet = false;
eb91eb18 181static bool arg_register = true;
89f7c846 182static bool arg_keep_unit = false;
aa28aefe 183static char **arg_network_interfaces = NULL;
c74e630d 184static char **arg_network_macvlan = NULL;
4bbfe7ad 185static char **arg_network_ipvlan = NULL;
69c79d3c 186static bool arg_network_veth = false;
f6d6bad1 187static char **arg_network_veth_extra = NULL;
f757855e 188static char *arg_network_bridge = NULL;
22b28dfd 189static char *arg_network_zone = NULL;
d7bea6b6 190static char *arg_network_namespace_path = NULL;
bb068de0 191static PagerFlags arg_pager_flags = 0;
050f7277 192static unsigned long arg_personality = PERSONALITY_INVALID;
ec16945e 193static char *arg_image = NULL;
de40a303 194static char *arg_oci_bundle = NULL;
f757855e 195static VolatileMode arg_volatile_mode = VOLATILE_NO;
6d0b55c2 196static ExposePort *arg_expose_ports = NULL;
f36933fe 197static char **arg_property = NULL;
de40a303 198static sd_bus_message *arg_property_message = NULL;
0de7acce 199static UserNamespaceMode arg_userns_mode = USER_NAMESPACE_NO;
6dac160c 200static uid_t arg_uid_shift = UID_INVALID, arg_uid_range = 0x10000U;
0de7acce 201static bool arg_userns_chown = false;
c6c8f6e2 202static int arg_kill_signal = 0;
5da38d07 203static CGroupUnified arg_unified_cgroup_hierarchy = CGROUP_UNIFIED_UNKNOWN;
f757855e
LP		 204static SettingsMask arg_settings_mask = 0;
205static int arg_settings_trusted = -1;
206static char **arg_parameters = NULL;
6aadfa4c 207static const char *arg_container_service_name = "systemd-nspawn";
9c1e04d0 208static bool arg_notify_ready = false;
5a8ff0e6 209static bool arg_use_cgns = true;
0c582db0 210static unsigned long arg_clone_ns_flags = CLONE_NEWIPC|CLONE_NEWPID|CLONE_NEWUTS;
1099ceeb 211static MountSettingsMask arg_mount_settings = MOUNT_APPLY_APIVFS_RO|MOUNT_APPLY_TMPFS_TMP;
4623e8e6
LP		 212static void *arg_root_hash = NULL;
213static size_t arg_root_hash_size = 0;
960e4569
LP		 214static char **arg_syscall_whitelist = NULL;
215static char **arg_syscall_blacklist = NULL;
de40a303
LP		 216#if HAVE_SECCOMP
217static scmp_filter_ctx arg_seccomp = NULL;
218#endif
bf428efb 219static struct rlimit *arg_rlimit[_RLIMIT_MAX] = {};
66edd963 220static bool arg_no_new_privileges = false;
81f345df
LP		 221static int arg_oom_score_adjust = 0;
222static bool arg_oom_score_adjust_set = false;
0985c7c4 223static CPUSet arg_cpu_set = {};
09d423e9 224static ResolvConfMode arg_resolv_conf = RESOLV_CONF_AUTO;
1688841f 225static TimezoneMode arg_timezone = TIMEZONE_AUTO;
de40a303
LP		 226static unsigned arg_console_width = (unsigned) -1, arg_console_height = (unsigned) -1;
227static DeviceNode* arg_extra_nodes = NULL;
228static size_t arg_n_extra_nodes = 0;
229static char **arg_sysctl = NULL;
230static ConsoleMode arg_console_mode = _CONSOLE_MODE_INVALID;
88213476 231
6145bb4f
LP		 232STATIC_DESTRUCTOR_REGISTER(arg_directory, freep);
233STATIC_DESTRUCTOR_REGISTER(arg_template, freep);
234STATIC_DESTRUCTOR_REGISTER(arg_chdir, freep);
235STATIC_DESTRUCTOR_REGISTER(arg_pivot_root_new, freep);
236STATIC_DESTRUCTOR_REGISTER(arg_pivot_root_old, freep);
237STATIC_DESTRUCTOR_REGISTER(arg_user, freep);
238STATIC_DESTRUCTOR_REGISTER(arg_supplementary_gids, freep);
239STATIC_DESTRUCTOR_REGISTER(arg_machine, freep);
240STATIC_DESTRUCTOR_REGISTER(arg_hostname, freep);
241STATIC_DESTRUCTOR_REGISTER(arg_slice, freep);
242STATIC_DESTRUCTOR_REGISTER(arg_setenv, strv_freep);
243STATIC_DESTRUCTOR_REGISTER(arg_network_interfaces, strv_freep);
244STATIC_DESTRUCTOR_REGISTER(arg_network_macvlan, strv_freep);
245STATIC_DESTRUCTOR_REGISTER(arg_network_ipvlan, strv_freep);
246STATIC_DESTRUCTOR_REGISTER(arg_network_veth_extra, strv_freep);
247STATIC_DESTRUCTOR_REGISTER(arg_network_bridge, freep);
248STATIC_DESTRUCTOR_REGISTER(arg_network_zone, freep);
249STATIC_DESTRUCTOR_REGISTER(arg_network_namespace_path, freep);
250STATIC_DESTRUCTOR_REGISTER(arg_image, freep);
251STATIC_DESTRUCTOR_REGISTER(arg_oci_bundle, freep);
252STATIC_DESTRUCTOR_REGISTER(arg_property, strv_freep);
253STATIC_DESTRUCTOR_REGISTER(arg_property_message, sd_bus_message_unrefp);
254STATIC_DESTRUCTOR_REGISTER(arg_parameters, strv_freep);
255STATIC_DESTRUCTOR_REGISTER(arg_root_hash, freep);
256STATIC_DESTRUCTOR_REGISTER(arg_syscall_whitelist, strv_freep);
257STATIC_DESTRUCTOR_REGISTER(arg_syscall_blacklist, strv_freep);
258#if HAVE_SECCOMP
259STATIC_DESTRUCTOR_REGISTER(arg_seccomp, seccomp_releasep);
260#endif
0985c7c4 261STATIC_DESTRUCTOR_REGISTER(arg_cpu_set, cpu_set_reset);
6145bb4f
LP		 262STATIC_DESTRUCTOR_REGISTER(arg_sysctl, strv_freep);
263
37ec0fdd
LP		 264static int help(void) {
265 _cleanup_free_ char *link = NULL;
266 int r;
267
bb068de0 268 (void) pager_open(arg_pager_flags);
50ebcf6c 269
37ec0fdd
LP		 270 r = terminal_urlify_man("systemd-nspawn", "1", &link);
271 if (r < 0)
272 return log_oom();
273
25148653 274 printf("%1$s [OPTIONS...] [PATH] [ARGUMENTS...]\n\n"
a7e2e50d 275 "Spawn a command or OS in a light-weight container.\n\n"
a8828ed9
DW		 276 " -h --help Show this help\n"
277 " --version Print version string\n"
69c79d3c 278 " -q --quiet Do not show status information\n"
bb068de0 279 " --no-pager Do not pipe output into a pager\n"
25148653
LP		 280 " --settings=BOOLEAN Load additional settings from .nspawn file\n\n"
281 "%3$sImage:%4$s\n"
1b9e5b12 282 " -D --directory=PATH Root directory for the container\n"
ec16945e
LP		 283 " --template=PATH Initialize root directory from template directory,\n"
284 " if missing\n"
285 " -x --ephemeral Run container with snapshot of root directory, and\n"
286 " remove it after exit\n"
25e68fd3
LP		 287 " -i --image=PATH Root file system disk image (or device node) for\n"
288 " the container\n"
de40a303 289 " --oci-bundle=PATH OCI bundle directory\n"
25148653
LP		 290 " --read-only Mount the root directory read-only\n"
291 " --volatile[=MODE] Run the system in volatile mode\n"
25e68fd3 292 " --root-hash=HASH Specify verity root hash for root disk image\n"
25148653
LP		 293 " --pivot-root=PATH[:PATH]\n"
294 " Pivot root to given directory in the container\n\n"
295 "%3$sExecution:%4$s\n"
7732f92b 296 " -a --as-pid2 Maintain a stub init as PID1, invoke binary as PID2\n"
a8828ed9 297 " -b --boot Boot up full system (i.e. invoke init)\n"
5f932eb9 298 " --chdir=PATH Set working directory in the container\n"
25148653
LP		 299 " -E --setenv=NAME=VALUE Pass an environment variable to PID 1\n"
300 " -u --user=USER Run the command under specified user or UID\n"
301 " --kill-signal=SIGNAL Select signal to use for shutting down PID 1\n"
302 " --notify-ready=BOOLEAN Receive notifications from the child init process\n\n"
303 "%3$sSystem Identity:%4$s\n"
a8828ed9 304 " -M --machine=NAME Set the machine name for the container\n"
3a9530e5 305 " --hostname=NAME Override the hostname for the container\n"
25148653
LP		 306 " --uuid=UUID Set a specific machine UUID for the container\n\n"
307 "%3$sProperties:%4$s\n"
a8828ed9 308 " -S --slice=SLICE Place the container in the specified slice\n"
f36933fe 309 " --property=NAME=VALUE Set scope unit property\n"
25148653
LP		 310 " --register=BOOLEAN Register container as machine\n"
311 " --keep-unit Do not register a scope for the machine, reuse\n"
312 " the service unit nspawn is running in\n\n"
313 "%3$sUser Namespacing:%4$s\n"
90b4a64d 314 " -U --private-users=pick Run within user namespace, autoselect UID/GID range\n"
03cfe0d5 315 " --private-users[=UIDBASE[:NUIDS]]\n"
90b4a64d 316 " Similar, but with user configured UID/GID range\n"
25148653
LP		 317 " --private-users-chown Adjust OS tree ownership to private UID/GID range\n\n"
318 "%3$sNetworking:%4$s\n"
69c79d3c
LP		 319 " --private-network Disable network in container\n"
320 " --network-interface=INTERFACE\n"
321 " Assign an existing network interface to the\n"
322 " container\n"
c74e630d
LP		 323 " --network-macvlan=INTERFACE\n"
324 " Create a macvlan network interface based on an\n"
325 " existing network interface to the container\n"
4bbfe7ad
TG		 326 " --network-ipvlan=INTERFACE\n"
327 " Create a ipvlan network interface based on an\n"
328 " existing network interface to the container\n"
a8eaaee7 329 " -n --network-veth Add a virtual Ethernet connection between host\n"
69c79d3c 330 " and container\n"
f6d6bad1
LP		 331 " --network-veth-extra=HOSTIF[:CONTAINERIF]\n"
332 " Add an additional virtual Ethernet link between\n"
333 " host and container\n"
ab046dde 334 " --network-bridge=INTERFACE\n"
90b4a64d
ZJS		 335 " Add a virtual Ethernet connection to the container\n"
336 " and attach it to an existing bridge on the host\n"
337 " --network-zone=NAME Similar, but attach the new interface to an\n"
338 " an automatically managed bridge interface\n"
d7bea6b6
DP		 339 " --network-namespace-path=PATH\n"
340 " Set network namespace to the one represented by\n"
341 " the specified kernel namespace file node\n"
6d0b55c2 342 " -p --port=[PROTOCOL:]HOSTPORT[:CONTAINERPORT]\n"
25148653
LP		 343 " Expose a container IP port on the host\n\n"
344 "%3$sSecurity:%4$s\n"
a8828ed9
DW		 345 " --capability=CAP In addition to the default, retain specified\n"
346 " capability\n"
347 " --drop-capability=CAP Drop the specified capability from the default set\n"
f4e803c8 348 " --no-new-privileges Set PR_SET_NO_NEW_PRIVS flag for container payload\n"
960e4569
LP		 349 " --system-call-filter=LIST|~LIST\n"
350 " Permit/prohibit specific system calls\n"
25148653
LP		 351 " -Z --selinux-context=SECLABEL\n"
352 " Set the SELinux security context to be used by\n"
353 " processes in the container\n"
354 " -L --selinux-apifs-context=SECLABEL\n"
355 " Set the SELinux security context to be used by\n"
356 " API/tmpfs file systems in the container\n\n"
357 "%3$sResources:%4$s\n"
bf428efb 358 " --rlimit=NAME=LIMIT Set a resource limit for the payload\n"
81f345df
LP		 359 " --oom-score-adjust=VALUE\n"
360 " Adjust the OOM score value for the payload\n"
f4e803c8
LP		 361 " --cpu-affinity=CPUS Adjust the CPU affinity of the container\n"
362 " --personality=ARCH Pick personality for this container\n\n"
25148653 363 "%3$sIntegration:%4$s\n"
09d423e9 364 " --resolv-conf=MODE Select mode of /etc/resolv.conf initialization\n"
1688841f 365 " --timezone=MODE Select mode of /etc/localtime initialization\n"
25148653
LP		 366 " --link-journal=MODE Link up guest journal, one of no, auto, guest, \n"
367 " host, try-guest, try-host\n"
368 " -j Equivalent to --link-journal=try-guest\n\n"
369 "%3$sMounts:%4$s\n"
5e5bfa6e
EY		 370 " --bind=PATH[:PATH[:OPTIONS]]\n"
371 " Bind mount a file or directory from the host into\n"
a8828ed9 372 " the container\n"
5e5bfa6e
EY		 373 " --bind-ro=PATH[:PATH[:OPTIONS]\n"
374 " Similar, but creates a read-only bind mount\n"
de40a303
LP		 375 " --inaccessible=PATH Over-mount file node with inaccessible node to mask\n"
376 " it\n"
06c17c39 377 " --tmpfs=PATH:[OPTIONS] Mount an empty tmpfs to the specified directory\n"
5a8af538
LP		 378 " --overlay=PATH[:PATH...]:PATH\n"
379 " Create an overlay mount from the host to \n"
380 " the container\n"
381 " --overlay-ro=PATH[:PATH...]:PATH\n"
25148653
LP		 382 " Similar, but creates a read-only overlay mount\n\n"
383 "%3$sInput/Output:%4$s\n"
de40a303
LP		 384 " --console=MODE Select how stdin/stdout/stderr and /dev/console are\n"
385 " set up for the container.\n"
386 " -P --pipe Equivalent to --console=pipe\n"
25148653 387 "\nSee the %2$s for details.\n"
37ec0fdd
LP		 388 , program_invocation_short_name
389 , link
25148653 390 , ansi_underline(), ansi_normal());
37ec0fdd
LP		 391
392 return 0;
88213476
LP		 393}
394
86c0dd4a 395static int custom_mount_check_all(void) {
88614c8a 396 size_t i;
5a8af538 397
5a8af538
LP		 398 for (i = 0; i < arg_n_custom_mounts; i++) {
399 CustomMount *m = &arg_custom_mounts[i];
400
0de7acce 401 if (path_equal(m->destination, "/") && arg_userns_mode != USER_NAMESPACE_NO) {
baaa35ad
ZJS		 402 if (arg_userns_chown)
403 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
404 "--private-users-chown may not be combined with custom root mounts.");
405 else if (arg_uid_shift == UID_INVALID)
406 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
407 "--private-users with automatic UID shift may not be combined with custom root mounts.");
825d5287 408 }
5a8af538
LP		 409 }
410
411 return 0;
412}
413
8199d554 414static int detect_unified_cgroup_hierarchy_from_environment(void) {
efdb0237 415 const char *e;
415fc41c 416 int r;
5da38d07 417
efdb0237
LP		 418 /* Allow the user to control whether the unified hierarchy is used */
419 e = getenv("UNIFIED_CGROUP_HIERARCHY");
420 if (e) {
421 r = parse_boolean(e);
422 if (r < 0)
423 return log_error_errno(r, "Failed to parse $UNIFIED_CGROUP_HIERARCHY.");
5da38d07
TH		 424 if (r > 0)
425 arg_unified_cgroup_hierarchy = CGROUP_UNIFIED_ALL;
426 else
427 arg_unified_cgroup_hierarchy = CGROUP_UNIFIED_NONE;
efdb0237
LP		 428 }
429
8199d554
LP		 430 return 0;
431}
432
433static int detect_unified_cgroup_hierarchy_from_image(const char *directory) {
434 int r;
435
436 /* Let's inherit the mode to use from the host system, but let's take into consideration what systemd in the
437 * image actually supports. */
b4cccbc1
LP		 438 r = cg_all_unified();
439 if (r < 0)
440 return log_error_errno(r, "Failed to determine whether we are in all unified mode.");
441 if (r > 0) {
a8725a06
ZJS		 442 /* Unified cgroup hierarchy support was added in 230. Unfortunately the detection
443 * routine only detects 231, so we'll have a false negative here for 230. */
444 r = systemd_installation_has_version(directory, 230);
445 if (r < 0)
446 return log_error_errno(r, "Failed to determine systemd version in container: %m");
447 if (r > 0)
448 arg_unified_cgroup_hierarchy = CGROUP_UNIFIED_ALL;
449 else
450 arg_unified_cgroup_hierarchy = CGROUP_UNIFIED_NONE;
c22800e4 451 } else if (cg_unified_controller(SYSTEMD_CGROUP_CONTROLLER) > 0) {
2977724b
TH		 452 /* Mixed cgroup hierarchy support was added in 233 */
453 r = systemd_installation_has_version(directory, 233);
0fd9563f
ZJS		 454 if (r < 0)
455 return log_error_errno(r, "Failed to determine systemd version in container: %m");
456 if (r > 0)
457 arg_unified_cgroup_hierarchy = CGROUP_UNIFIED_SYSTEMD;
458 else
459 arg_unified_cgroup_hierarchy = CGROUP_UNIFIED_NONE;
460 } else
5da38d07 461 arg_unified_cgroup_hierarchy = CGROUP_UNIFIED_NONE;
efdb0237 462
8199d554
LP		 463 log_debug("Using %s hierarchy for container.",
464 arg_unified_cgroup_hierarchy == CGROUP_UNIFIED_NONE ? "legacy" :
465 arg_unified_cgroup_hierarchy == CGROUP_UNIFIED_SYSTEMD ? "hybrid" : "unified");
466
efdb0237
LP		 467 return 0;
468}
469
0c582db0
LB		 470static void parse_share_ns_env(const char *name, unsigned long ns_flag) {
471 int r;
472
473 r = getenv_bool(name);
474 if (r == -ENXIO)
475 return;
476 if (r < 0)
477 log_warning_errno(r, "Failed to parse %s from environment, defaulting to false.", name);
de40a303 478
0c582db0 479 arg_clone_ns_flags = (arg_clone_ns_flags & ~ns_flag) | (r > 0 ? 0 : ns_flag);
de40a303 480 arg_settings_mask |= SETTING_CLONE_NS_FLAGS;
0c582db0
LB		 481}
482
4f086aab 483static void parse_mount_settings_env(void) {
4f086aab 484 const char *e;
1099ceeb
LP		 485 int r;
486
487 r = getenv_bool("SYSTEMD_NSPAWN_TMPFS_TMP");
488 if (r >= 0)
489 SET_FLAG(arg_mount_settings, MOUNT_APPLY_TMPFS_TMP, r > 0);
490 else if (r != -ENXIO)
491 log_warning_errno(r, "Failed to parse $SYSTEMD_NSPAWN_TMPFS_TMP, ignoring: %m");
4f086aab
SU		 492
493 e = getenv("SYSTEMD_NSPAWN_API_VFS_WRITABLE");
494 if (!e)
495 return;
496
497 if (streq(e, "network")) {
498 arg_mount_settings |= MOUNT_APPLY_APIVFS_RO|MOUNT_APPLY_APIVFS_NETNS;
499 return;
500 }
501
502 r = parse_boolean(e);
503 if (r < 0) {
504 log_warning_errno(r, "Failed to parse SYSTEMD_NSPAWN_API_VFS_WRITABLE from environment, ignoring.");
505 return;
ab8ee0f2 506 }
4f086aab 507
ab8ee0f2
ZJS		 508 SET_FLAG(arg_mount_settings, MOUNT_APPLY_APIVFS_RO, r == 0);
509 SET_FLAG(arg_mount_settings, MOUNT_APPLY_APIVFS_NETNS, false);
4f086aab
SU		 510}
511
d5455d2f
LP		 512static void parse_environment(void) {
513 const char *e;
514 int r;
515
516 parse_share_ns_env("SYSTEMD_NSPAWN_SHARE_NS_IPC", CLONE_NEWIPC);
517 parse_share_ns_env("SYSTEMD_NSPAWN_SHARE_NS_PID", CLONE_NEWPID);
518 parse_share_ns_env("SYSTEMD_NSPAWN_SHARE_NS_UTS", CLONE_NEWUTS);
519 parse_share_ns_env("SYSTEMD_NSPAWN_SHARE_SYSTEM", CLONE_NEWIPC|CLONE_NEWPID|CLONE_NEWUTS);
520
521 parse_mount_settings_env();
522
489fae52
ZJS		 523 /* SYSTEMD_NSPAWN_USE_CGNS=0 can be used to disable CLONE_NEWCGROUP use,
524 * even if it is supported. If not supported, it has no effect. */
de40a303 525 if (!cg_ns_supported())
489fae52 526 arg_use_cgns = false;
de40a303
LP		 527 else {
528 r = getenv_bool("SYSTEMD_NSPAWN_USE_CGNS");
529 if (r < 0) {
530 if (r != -ENXIO)
531 log_warning_errno(r, "Failed to parse $SYSTEMD_NSPAWN_USE_CGNS, ignoring: %m");
532
533 arg_use_cgns = true;
534 } else {
535 arg_use_cgns = r > 0;
536 arg_settings_mask |= SETTING_USE_CGNS;
537 }
538 }
d5455d2f
LP		 539
540 e = getenv("SYSTEMD_NSPAWN_CONTAINER_SERVICE");
541 if (e)
542 arg_container_service_name = e;
543
544 detect_unified_cgroup_hierarchy_from_environment();
545}
546
88213476 547static int parse_argv(int argc, char *argv[]) {
a41fe3a2 548 enum {
acbeb427
ZJS		 549 ARG_VERSION = 0x100,
550 ARG_PRIVATE_NETWORK,
bc2f673e 551 ARG_UUID,
5076f0cc 552 ARG_READ_ONLY,
57fb9fb5 553 ARG_CAPABILITY,
420c7379 554 ARG_DROP_CAPABILITY,
17fe0523
LP		 555 ARG_LINK_JOURNAL,
556 ARG_BIND,
f4889f65 557 ARG_BIND_RO,
06c17c39 558 ARG_TMPFS,
5a8af538
LP		 559 ARG_OVERLAY,
560 ARG_OVERLAY_RO,
de40a303 561 ARG_INACCESSIBLE,
eb91eb18 562 ARG_SHARE_SYSTEM,
89f7c846 563 ARG_REGISTER,
aa28aefe 564 ARG_KEEP_UNIT,
69c79d3c 565 ARG_NETWORK_INTERFACE,
c74e630d 566 ARG_NETWORK_MACVLAN,
4bbfe7ad 567 ARG_NETWORK_IPVLAN,
ab046dde 568 ARG_NETWORK_BRIDGE,
22b28dfd 569 ARG_NETWORK_ZONE,
f6d6bad1 570 ARG_NETWORK_VETH_EXTRA,
d7bea6b6 571 ARG_NETWORK_NAMESPACE_PATH,
6afc95b7 572 ARG_PERSONALITY,
4d9f07b4 573 ARG_VOLATILE,
ec16945e 574 ARG_TEMPLATE,
f36933fe 575 ARG_PROPERTY,
6dac160c 576 ARG_PRIVATE_USERS,
c6c8f6e2 577 ARG_KILL_SIGNAL,
f757855e 578 ARG_SETTINGS,
5f932eb9 579 ARG_CHDIR,
b53ede69 580 ARG_PIVOT_ROOT,
7336138e 581 ARG_PRIVATE_USERS_CHOWN,
9c1e04d0 582 ARG_NOTIFY_READY,
4623e8e6 583 ARG_ROOT_HASH,
960e4569 584 ARG_SYSTEM_CALL_FILTER,
bf428efb 585 ARG_RLIMIT,
3a9530e5 586 ARG_HOSTNAME,
66edd963 587 ARG_NO_NEW_PRIVILEGES,
81f345df 588 ARG_OOM_SCORE_ADJUST,
d107bb7d 589 ARG_CPU_AFFINITY,
09d423e9 590 ARG_RESOLV_CONF,
1688841f 591 ARG_TIMEZONE,
de40a303
LP		 592 ARG_CONSOLE,
593 ARG_PIPE,
594 ARG_OCI_BUNDLE,
bb068de0 595 ARG_NO_PAGER,
a41fe3a2
LP		 596 };
597
88213476 598 static const struct option options[] = {
d7bea6b6
DP		 599 { "help", no_argument, NULL, 'h' },
600 { "version", no_argument, NULL, ARG_VERSION },
601 { "directory", required_argument, NULL, 'D' },
602 { "template", required_argument, NULL, ARG_TEMPLATE },
603 { "ephemeral", no_argument, NULL, 'x' },
604 { "user", required_argument, NULL, 'u' },
605 { "private-network", no_argument, NULL, ARG_PRIVATE_NETWORK },
606 { "as-pid2", no_argument, NULL, 'a' },
607 { "boot", no_argument, NULL, 'b' },
608 { "uuid", required_argument, NULL, ARG_UUID },
609 { "read-only", no_argument, NULL, ARG_READ_ONLY },
610 { "capability", required_argument, NULL, ARG_CAPABILITY },
611 { "drop-capability", required_argument, NULL, ARG_DROP_CAPABILITY },
66edd963 612 { "no-new-privileges", required_argument, NULL, ARG_NO_NEW_PRIVILEGES },
d7bea6b6
DP		 613 { "link-journal", required_argument, NULL, ARG_LINK_JOURNAL },
614 { "bind", required_argument, NULL, ARG_BIND },
615 { "bind-ro", required_argument, NULL, ARG_BIND_RO },
616 { "tmpfs", required_argument, NULL, ARG_TMPFS },
617 { "overlay", required_argument, NULL, ARG_OVERLAY },
618 { "overlay-ro", required_argument, NULL, ARG_OVERLAY_RO },
de40a303 619 { "inaccessible", required_argument, NULL, ARG_INACCESSIBLE },
d7bea6b6 620 { "machine", required_argument, NULL, 'M' },
3a9530e5 621 { "hostname", required_argument, NULL, ARG_HOSTNAME },
d7bea6b6
DP		 622 { "slice", required_argument, NULL, 'S' },
623 { "setenv", required_argument, NULL, 'E' },
624 { "selinux-context", required_argument, NULL, 'Z' },
625 { "selinux-apifs-context", required_argument, NULL, 'L' },
626 { "quiet", no_argument, NULL, 'q' },
627 { "share-system", no_argument, NULL, ARG_SHARE_SYSTEM }, /* not documented */
628 { "register", required_argument, NULL, ARG_REGISTER },
629 { "keep-unit", no_argument, NULL, ARG_KEEP_UNIT },
630 { "network-interface", required_argument, NULL, ARG_NETWORK_INTERFACE },
631 { "network-macvlan", required_argument, NULL, ARG_NETWORK_MACVLAN },
632 { "network-ipvlan", required_argument, NULL, ARG_NETWORK_IPVLAN },
633 { "network-veth", no_argument, NULL, 'n' },
634 { "network-veth-extra", required_argument, NULL, ARG_NETWORK_VETH_EXTRA },
635 { "network-bridge", required_argument, NULL, ARG_NETWORK_BRIDGE },
636 { "network-zone", required_argument, NULL, ARG_NETWORK_ZONE },
637 { "network-namespace-path", required_argument, NULL, ARG_NETWORK_NAMESPACE_PATH },
638 { "personality", required_argument, NULL, ARG_PERSONALITY },
639 { "image", required_argument, NULL, 'i' },
640 { "volatile", optional_argument, NULL, ARG_VOLATILE },
641 { "port", required_argument, NULL, 'p' },
642 { "property", required_argument, NULL, ARG_PROPERTY },
643 { "private-users", optional_argument, NULL, ARG_PRIVATE_USERS },
644 { "private-users-chown", optional_argument, NULL, ARG_PRIVATE_USERS_CHOWN },
645 { "kill-signal", required_argument, NULL, ARG_KILL_SIGNAL },
646 { "settings", required_argument, NULL, ARG_SETTINGS },
647 { "chdir", required_argument, NULL, ARG_CHDIR },
648 { "pivot-root", required_argument, NULL, ARG_PIVOT_ROOT },
649 { "notify-ready", required_argument, NULL, ARG_NOTIFY_READY },
650 { "root-hash", required_argument, NULL, ARG_ROOT_HASH },
651 { "system-call-filter", required_argument, NULL, ARG_SYSTEM_CALL_FILTER },
bf428efb 652 { "rlimit", required_argument, NULL, ARG_RLIMIT },
81f345df 653 { "oom-score-adjust", required_argument, NULL, ARG_OOM_SCORE_ADJUST },
d107bb7d 654 { "cpu-affinity", required_argument, NULL, ARG_CPU_AFFINITY },
09d423e9 655 { "resolv-conf", required_argument, NULL, ARG_RESOLV_CONF },
1688841f 656 { "timezone", required_argument, NULL, ARG_TIMEZONE },
de40a303
LP		 657 { "console", required_argument, NULL, ARG_CONSOLE },
658 { "pipe", no_argument, NULL, ARG_PIPE },
659 { "oci-bundle", required_argument, NULL, ARG_OCI_BUNDLE },
bb068de0 660 { "no-pager", no_argument, NULL, ARG_NO_PAGER },
eb9da376 661 {}
88213476
LP		 662 };
663
9444b1f2 664 int c, r;
d5455d2f 665 const char *p;
a42c8b54 666 uint64_t plus = 0, minus = 0;
f757855e 667 bool mask_all_settings = false, mask_no_settings = false;
88213476
LP		 668
669 assert(argc >= 0);
670 assert(argv);
671
de40a303 672 while ((c = getopt_long(argc, argv, "+hD:u:abL:M:jS:Z:qi:xp:nUE:P", options, NULL)) >= 0)
88213476
LP		 673 switch (c) {
674
675 case 'h':
37ec0fdd 676 return help();
88213476 677
acbeb427 678 case ARG_VERSION:
3f6fd1ba 679 return version();
acbeb427 680
88213476 681 case 'D':
0f03c2a4 682 r = parse_path_argument_and_warn(optarg, false, &arg_directory);
ec16945e 683 if (r < 0)
0f03c2a4 684 return r;
de40a303
LP		 685
686 arg_settings_mask |= SETTING_DIRECTORY;
ec16945e
LP		 687 break;
688
689 case ARG_TEMPLATE:
0f03c2a4 690 r = parse_path_argument_and_warn(optarg, false, &arg_template);
ec16945e 691 if (r < 0)
0f03c2a4 692 return r;
de40a303
LP		 693
694 arg_settings_mask |= SETTING_DIRECTORY;
88213476
LP		 695 break;
696
1b9e5b12 697 case 'i':
0f03c2a4 698 r = parse_path_argument_and_warn(optarg, false, &arg_image);
ec16945e 699 if (r < 0)
0f03c2a4 700 return r;
de40a303
LP		 701
702 arg_settings_mask |= SETTING_DIRECTORY;
703 break;
704
705 case ARG_OCI_BUNDLE:
706 r = parse_path_argument_and_warn(optarg, false, &arg_oci_bundle);
707 if (r < 0)
708 return r;
709
ec16945e
LP		 710 break;
711
712 case 'x':
713 arg_ephemeral = true;
a2f577fc 714 arg_settings_mask |= SETTING_EPHEMERAL;
1b9e5b12
LP		 715 break;
716
687d0825 717 case 'u':
2fc09a9c
DM		 718 r = free_and_strdup(&arg_user, optarg);
719 if (r < 0)
7027ff61 720 return log_oom();
687d0825 721
f757855e 722 arg_settings_mask |= SETTING_USER;
687d0825
MV		 723 break;
724
22b28dfd
LP		 725 case ARG_NETWORK_ZONE: {
726 char *j;
727
728 j = strappend("vz-", optarg);
729 if (!j)
730 return log_oom();
731
732 if (!ifname_valid(j)) {
733 log_error("Network zone name not valid: %s", j);
734 free(j);
735 return -EINVAL;
736 }
737
df1fac6d 738 free_and_replace(arg_network_zone, j);
22b28dfd
LP		 739
740 arg_network_veth = true;
741 arg_private_network = true;
742 arg_settings_mask |= SETTING_NETWORK;
743 break;
744 }
745
ab046dde 746 case ARG_NETWORK_BRIDGE:
ef76dff2 747
baaa35ad
ZJS		 748 if (!ifname_valid(optarg))
749 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
750 "Bridge interface name not valid: %s", optarg);
ef76dff2 751
f757855e
LP		 752 r = free_and_strdup(&arg_network_bridge, optarg);
753 if (r < 0)
754 return log_oom();
ab046dde 755
4831981d 756 _fallthrough_;
0dfaa006 757 case 'n':
69c79d3c
LP		 758 arg_network_veth = true;
759 arg_private_network = true;
f757855e 760 arg_settings_mask |= SETTING_NETWORK;
69c79d3c
LP		 761 break;
762
f6d6bad1
LP		 763 case ARG_NETWORK_VETH_EXTRA:
764 r = veth_extra_parse(&arg_network_veth_extra, optarg);
765 if (r < 0)
766 return log_error_errno(r, "Failed to parse --network-veth-extra= parameter: %s", optarg);
767
768 arg_private_network = true;
769 arg_settings_mask |= SETTING_NETWORK;
770 break;
771
aa28aefe 772 case ARG_NETWORK_INTERFACE:
baaa35ad
ZJS		 773 if (!ifname_valid(optarg))
774 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
775 "Network interface name not valid: %s", optarg);
ef76dff2 776
c74e630d
LP		 777 if (strv_extend(&arg_network_interfaces, optarg) < 0)
778 return log_oom();
779
780 arg_private_network = true;
f757855e 781 arg_settings_mask |= SETTING_NETWORK;
c74e630d
LP		 782 break;
783
784 case ARG_NETWORK_MACVLAN:
ef76dff2 785
baaa35ad
ZJS		 786 if (!ifname_valid(optarg))
787 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
788 "MACVLAN network interface name not valid: %s", optarg);
ef76dff2 789
c74e630d 790 if (strv_extend(&arg_network_macvlan, optarg) < 0)
aa28aefe
LP		 791 return log_oom();
792
4bbfe7ad 793 arg_private_network = true;
f757855e 794 arg_settings_mask |= SETTING_NETWORK;
4bbfe7ad
TG		 795 break;
796
797 case ARG_NETWORK_IPVLAN:
ef76dff2 798
baaa35ad
ZJS		 799 if (!ifname_valid(optarg))
800 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
801 "IPVLAN network interface name not valid: %s", optarg);
ef76dff2 802
4bbfe7ad
TG		 803 if (strv_extend(&arg_network_ipvlan, optarg) < 0)
804 return log_oom();
805
4831981d 806 _fallthrough_;
ff01d048
LP		 807 case ARG_PRIVATE_NETWORK:
808 arg_private_network = true;
f757855e 809 arg_settings_mask |= SETTING_NETWORK;
a41fe3a2
LP		 810 break;
811
d7bea6b6
DP		 812 case ARG_NETWORK_NAMESPACE_PATH:
813 r = parse_path_argument_and_warn(optarg, false, &arg_network_namespace_path);
814 if (r < 0)
815 return r;
816
de40a303 817 arg_settings_mask |= SETTING_NETWORK;
d7bea6b6
DP		 818 break;
819
0f0dbc46 820 case 'b':
baaa35ad
ZJS		 821 if (arg_start_mode == START_PID2)
822 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
823 "--boot and --as-pid2 may not be combined.");
7732f92b
LP		 824
825 arg_start_mode = START_BOOT;
826 arg_settings_mask |= SETTING_START_MODE;
827 break;
828
829 case 'a':
baaa35ad
ZJS		 830 if (arg_start_mode == START_BOOT)
831 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
832 "--boot and --as-pid2 may not be combined.");
7732f92b
LP		 833
834 arg_start_mode = START_PID2;
835 arg_settings_mask |= SETTING_START_MODE;
0f0dbc46
LP		 836 break;
837
144f0fc0 838 case ARG_UUID:
9444b1f2 839 r = sd_id128_from_string(optarg, &arg_uuid);
317feb4d
LP		 840 if (r < 0)
841 return log_error_errno(r, "Invalid UUID: %s", optarg);
842
baaa35ad
ZJS		 843 if (sd_id128_is_null(arg_uuid))
844 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
845 "Machine UUID may not be all zeroes.");
f757855e
LP		 846
847 arg_settings_mask |= SETTING_MACHINE_ID;
9444b1f2 848 break;
aa96c6cb 849
9444b1f2 850 case 'S':
de40a303
LP		 851 r = free_and_strdup(&arg_slice, optarg);
852 if (r < 0)
853 return log_oom();
854
855 arg_settings_mask |= SETTING_SLICE;
144f0fc0
LP		 856 break;
857
7027ff61 858 case 'M':
c1521918 859 if (isempty(optarg))
97b11eed 860 arg_machine = mfree(arg_machine);
c1521918 861 else {
baaa35ad
ZJS		 862 if (!machine_name_is_valid(optarg))
863 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
864 "Invalid machine name: %s", optarg);
7027ff61 865
0c3c4284
LP		 866 r = free_and_strdup(&arg_machine, optarg);
867 if (r < 0)
eb91eb18 868 return log_oom();
eb91eb18 869 }
9ce6d1b3 870 break;
7027ff61 871
3a9530e5
LP		 872 case ARG_HOSTNAME:
873 if (isempty(optarg))
874 arg_hostname = mfree(arg_hostname);
875 else {
baaa35ad
ZJS		 876 if (!hostname_is_valid(optarg, false))
877 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
878 "Invalid hostname: %s", optarg);
3a9530e5
LP		 879
880 r = free_and_strdup(&arg_hostname, optarg);
881 if (r < 0)
882 return log_oom();
883 }
884
885 arg_settings_mask |= SETTING_HOSTNAME;
886 break;
887
82adf6af
LP		 888 case 'Z':
889 arg_selinux_context = optarg;
a8828ed9
DW		 890 break;
891
82adf6af
LP		 892 case 'L':
893 arg_selinux_apifs_context = optarg;
a8828ed9
DW		 894 break;
895
bc2f673e
LP		 896 case ARG_READ_ONLY:
897 arg_read_only = true;
f757855e 898 arg_settings_mask |= SETTING_READ_ONLY;
bc2f673e
LP		 899 break;
900
420c7379
LP		 901 case ARG_CAPABILITY:
902 case ARG_DROP_CAPABILITY: {
6cbe4ed1 903 p = optarg;
9ed794a3 904 for (;;) {
6cbe4ed1 905 _cleanup_free_ char *t = NULL;
5076f0cc 906
6cbe4ed1
SS		 907 r = extract_first_word(&p, &t, ",", 0);
908 if (r < 0)
909 return log_error_errno(r, "Failed to parse capability %s.", t);
6cbe4ed1
SS		 910 if (r == 0)
911 break;
5076f0cc 912
39ed67d1
LP		 913 if (streq(t, "all")) {
914 if (c == ARG_CAPABILITY)
a42c8b54 915 plus = (uint64_t) -1;
39ed67d1 916 else
a42c8b54 917 minus = (uint64_t) -1;
39ed67d1 918 } else {
acf4d158
YW		 919 r = capability_from_name(t);
920 if (r < 0)
921 return log_error_errno(r, "Failed to parse capability %s.", t);
39ed67d1
LP		 922
923 if (c == ARG_CAPABILITY)
acf4d158 924 plus |= 1ULL << r;
39ed67d1 925 else
acf4d158 926 minus |= 1ULL << r;
5076f0cc 927 }
5076f0cc
LP		 928 }
929
f757855e 930 arg_settings_mask |= SETTING_CAPABILITY;
5076f0cc
LP		 931 break;
932 }
933
66edd963
LP		 934 case ARG_NO_NEW_PRIVILEGES:
935 r = parse_boolean(optarg);
936 if (r < 0)
937 return log_error_errno(r, "Failed to parse --no-new-privileges= argument: %s", optarg);
938
939 arg_no_new_privileges = r;
940 arg_settings_mask |= SETTING_NO_NEW_PRIVILEGES;
941 break;
942
57fb9fb5
LP		 943 case 'j':
944 arg_link_journal = LINK_GUEST;
574edc90 945 arg_link_journal_try = true;
4e1d6aa9 946 arg_settings_mask |= SETTING_LINK_JOURNAL;
57fb9fb5
LP		 947 break;
948
949 case ARG_LINK_JOURNAL:
4e1d6aa9 950 r = parse_link_journal(optarg, &arg_link_journal, &arg_link_journal_try);
c6147113
LP		 951 if (r < 0)
952 return log_error_errno(r, "Failed to parse link journal mode %s", optarg);
57fb9fb5 953
4e1d6aa9 954 arg_settings_mask |= SETTING_LINK_JOURNAL;
57fb9fb5
LP		 955 break;
956
17fe0523 957 case ARG_BIND:
f757855e
LP		 958 case ARG_BIND_RO:
959 r = bind_mount_parse(&arg_custom_mounts, &arg_n_custom_mounts, optarg, c == ARG_BIND_RO);
960 if (r < 0)
961 return log_error_errno(r, "Failed to parse --bind(-ro)= argument %s: %m", optarg);
17fe0523 962
f757855e 963 arg_settings_mask |= SETTING_CUSTOM_MOUNTS;
17fe0523 964 break;
06c17c39 965
f757855e
LP		 966 case ARG_TMPFS:
967 r = tmpfs_mount_parse(&arg_custom_mounts, &arg_n_custom_mounts, optarg);
968 if (r < 0)
969 return log_error_errno(r, "Failed to parse --tmpfs= argument %s: %m", optarg);
5a8af538 970
f757855e 971 arg_settings_mask |= SETTING_CUSTOM_MOUNTS;
5a8af538 972 break;
5a8af538
LP		 973
974 case ARG_OVERLAY:
ad85779a
LP		 975 case ARG_OVERLAY_RO:
976 r = overlay_mount_parse(&arg_custom_mounts, &arg_n_custom_mounts, optarg, c == ARG_OVERLAY_RO);
977 if (r == -EADDRNOTAVAIL)
978 return log_error_errno(r, "--overlay(-ro)= needs at least two colon-separated directories specified.");
979 if (r < 0)
980 return log_error_errno(r, "Failed to parse --overlay(-ro)= argument %s: %m", optarg);
06c17c39 981
f757855e 982 arg_settings_mask |= SETTING_CUSTOM_MOUNTS;
06c17c39 983 break;
06c17c39 984
de40a303
LP		 985 case ARG_INACCESSIBLE:
986 r = inaccessible_mount_parse(&arg_custom_mounts, &arg_n_custom_mounts, optarg);
987 if (r < 0)
988 return log_error_errno(r, "Failed to parse --inaccessible= argument %s: %m", optarg);
989
990 arg_settings_mask |= SETTING_CUSTOM_MOUNTS;
991 break;
992
a5f1cb3b 993 case 'E': {
f4889f65
LP		 994 char **n;
995
baaa35ad
ZJS		 996 if (!env_assignment_is_valid(optarg))
997 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
998 "Environment variable assignment '%s' is not valid.", optarg);
f4889f65
LP		 999
1000 n = strv_env_set(arg_setenv, optarg);
1001 if (!n)
1002 return log_oom();
1003
130d3d22 1004 strv_free_and_replace(arg_setenv, n);
f757855e 1005 arg_settings_mask |= SETTING_ENVIRONMENT;
f4889f65
LP		 1006 break;
1007 }
1008
284c0b91
LP		 1009 case 'q':
1010 arg_quiet = true;
1011 break;
1012
8a96d94e 1013 case ARG_SHARE_SYSTEM:
a6b5216c 1014 /* We don't officially support this anymore, except for compat reasons. People should use the
0c582db0 1015 * $SYSTEMD_NSPAWN_SHARE_* environment variables instead. */
63d1c29f 1016 log_warning("Please do not use --share-system anymore, use $SYSTEMD_NSPAWN_SHARE_* instead.");
0c582db0 1017 arg_clone_ns_flags = 0;
8a96d94e
LP		 1018 break;
1019
eb91eb18
LP		 1020 case ARG_REGISTER:
1021 r = parse_boolean(optarg);
1022 if (r < 0) {
1023 log_error("Failed to parse --register= argument: %s", optarg);
1024 return r;
1025 }
1026
1027 arg_register = r;
1028 break;
1029
89f7c846
LP		 1030 case ARG_KEEP_UNIT:
1031 arg_keep_unit = true;
1032 break;
1033
6afc95b7
LP		 1034 case ARG_PERSONALITY:
1035
ac45f971 1036 arg_personality = personality_from_string(optarg);
baaa35ad
ZJS		 1037 if (arg_personality == PERSONALITY_INVALID)
1038 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
1039 "Unknown or unsupported personality '%s'.", optarg);
6afc95b7 1040
f757855e 1041 arg_settings_mask |= SETTING_PERSONALITY;
6afc95b7
LP		 1042 break;
1043
4d9f07b4
LP		 1044 case ARG_VOLATILE:
1045
1046 if (!optarg)
f757855e 1047 arg_volatile_mode = VOLATILE_YES;
5c828e66
LP		 1048 else if (streq(optarg, "help")) {
1049 DUMP_STRING_TABLE(volatile_mode, VolatileMode, _VOLATILE_MODE_MAX);
1050 return 0;
1051 } else {
f757855e 1052 VolatileMode m;
4d9f07b4 1053
f757855e 1054 m = volatile_mode_from_string(optarg);
baaa35ad
ZJS		 1055 if (m < 0)
1056 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
1057 "Failed to parse --volatile= argument: %s", optarg);
1058 else
f757855e 1059 arg_volatile_mode = m;
6d0b55c2
LP		 1060 }
1061
f757855e
LP		 1062 arg_settings_mask |= SETTING_VOLATILE_MODE;
1063 break;
6d0b55c2 1064
f757855e
LP		 1065 case 'p':
1066 r = expose_port_parse(&arg_expose_ports, optarg);
1067 if (r == -EEXIST)
1068 return log_error_errno(r, "Duplicate port specification: %s", optarg);
1069 if (r < 0)
1070 return log_error_errno(r, "Failed to parse host port %s: %m", optarg);
6d0b55c2 1071
f757855e 1072 arg_settings_mask |= SETTING_EXPOSE_PORTS;
6d0b55c2 1073 break;
6d0b55c2 1074
f36933fe
LP		 1075 case ARG_PROPERTY:
1076 if (strv_extend(&arg_property, optarg) < 0)
1077 return log_oom();
1078
1079 break;
1080
ae209204
ZJS		 1081 case ARG_PRIVATE_USERS: {
1082 int boolean = -1;
0de7acce 1083
ae209204
ZJS		 1084 if (!optarg)
1085 boolean = true;
1086 else if (!in_charset(optarg, DIGITS))
1087 /* do *not* parse numbers as booleans */
1088 boolean = parse_boolean(optarg);
1089
1090 if (boolean == false) {
0de7acce
LP		 1091 /* no: User namespacing off */
1092 arg_userns_mode = USER_NAMESPACE_NO;
1093 arg_uid_shift = UID_INVALID;
1094 arg_uid_range = UINT32_C(0x10000);
ae209204 1095 } else if (boolean == true) {
0de7acce
LP		 1096 /* yes: User namespacing on, UID range is read from root dir */
1097 arg_userns_mode = USER_NAMESPACE_FIXED;
1098 arg_uid_shift = UID_INVALID;
1099 arg_uid_range = UINT32_C(0x10000);
1100 } else if (streq(optarg, "pick")) {
1101 /* pick: User namespacing on, UID range is picked randomly */
1102 arg_userns_mode = USER_NAMESPACE_PICK;
1103 arg_uid_shift = UID_INVALID;
1104 arg_uid_range = UINT32_C(0x10000);
1105 } else {
6c2058b3 1106 _cleanup_free_ char *buffer = NULL;
6dac160c
LP		 1107 const char *range, *shift;
1108
0de7acce
LP		 1109 /* anything else: User namespacing on, UID range is explicitly configured */
1110
6dac160c
LP		 1111 range = strchr(optarg, ':');
1112 if (range) {
6c2058b3
ZJS		 1113 buffer = strndup(optarg, range - optarg);
1114 if (!buffer)
1115 return log_oom();
1116 shift = buffer;
6dac160c
LP		 1117
1118 range++;
bfd292ec
ZJS		 1119 r = safe_atou32(range, &arg_uid_range);
1120 if (r < 0)
be715731 1121 return log_error_errno(r, "Failed to parse UID range \"%s\": %m", range);
6dac160c
LP		 1122 } else
1123 shift = optarg;
1124
be715731
ZJS		 1125 r = parse_uid(shift, &arg_uid_shift);
1126 if (r < 0)
1127 return log_error_errno(r, "Failed to parse UID \"%s\": %m", optarg);
0de7acce
LP		 1128
1129 arg_userns_mode = USER_NAMESPACE_FIXED;
6dac160c
LP		 1130 }
1131
baaa35ad
ZJS		 1132 if (arg_uid_range <= 0)
1133 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
1134 "UID range cannot be 0.");
be715731 1135
0de7acce 1136 arg_settings_mask |= SETTING_USERNS;
6dac160c 1137 break;
ae209204 1138 }
6dac160c 1139
0de7acce 1140 case 'U':
ccabee0d
LP		 1141 if (userns_supported()) {
1142 arg_userns_mode = USER_NAMESPACE_PICK;
1143 arg_uid_shift = UID_INVALID;
1144 arg_uid_range = UINT32_C(0x10000);
1145
1146 arg_settings_mask |= SETTING_USERNS;
6dac160c
LP		 1147 }
1148
7336138e
LP		 1149 break;
1150
0de7acce 1151 case ARG_PRIVATE_USERS_CHOWN:
19aac838 1152 arg_userns_chown = true;
0de7acce
LP		 1153
1154 arg_settings_mask |= SETTING_USERNS;
6dac160c
LP		 1155 break;
1156
c6c8f6e2 1157 case ARG_KILL_SIGNAL:
5c828e66
LP		 1158 if (streq(optarg, "help")) {
1159 DUMP_STRING_TABLE(signal, int, _NSIG);
1160 return 0;
1161 }
1162
29a3db75 1163 arg_kill_signal = signal_from_string(optarg);
baaa35ad
ZJS		 1164 if (arg_kill_signal < 0)
1165 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
1166 "Cannot parse signal: %s", optarg);
c6c8f6e2 1167
f757855e
LP		 1168 arg_settings_mask |= SETTING_KILL_SIGNAL;
1169 break;
1170
1171 case ARG_SETTINGS:
1172
1173 /* no → do not read files
1174 * yes → read files, do not override cmdline, trust only subset
1175 * override → read files, override cmdline, trust only subset
1176 * trusted → read files, do not override cmdline, trust all
1177 */
1178
1179 r = parse_boolean(optarg);
1180 if (r < 0) {
1181 if (streq(optarg, "trusted")) {
1182 mask_all_settings = false;
1183 mask_no_settings = false;
1184 arg_settings_trusted = true;
1185
1186 } else if (streq(optarg, "override")) {
1187 mask_all_settings = false;
1188 mask_no_settings = true;
1189 arg_settings_trusted = -1;
1190 } else
1191 return log_error_errno(r, "Failed to parse --settings= argument: %s", optarg);
1192 } else if (r > 0) {
1193 /* yes */
1194 mask_all_settings = false;
1195 mask_no_settings = false;
1196 arg_settings_trusted = -1;
1197 } else {
1198 /* no */
1199 mask_all_settings = true;
1200 mask_no_settings = false;
1201 arg_settings_trusted = false;
1202 }
1203
c6c8f6e2
LP		 1204 break;
1205
5f932eb9 1206 case ARG_CHDIR:
baaa35ad
ZJS		 1207 if (!path_is_absolute(optarg))
1208 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
1209 "Working directory %s is not an absolute path.", optarg);
5f932eb9
LP		 1210
1211 r = free_and_strdup(&arg_chdir, optarg);
1212 if (r < 0)
1213 return log_oom();
1214
1215 arg_settings_mask |= SETTING_WORKING_DIRECTORY;
1216 break;
1217
b53ede69
PW		 1218 case ARG_PIVOT_ROOT:
1219 r = pivot_root_parse(&arg_pivot_root_new, &arg_pivot_root_old, optarg);
1220 if (r < 0)
1221 return log_error_errno(r, "Failed to parse --pivot-root= argument %s: %m", optarg);
1222
1223 arg_settings_mask |= SETTING_PIVOT_ROOT;
1224 break;
1225
9c1e04d0
AP		 1226 case ARG_NOTIFY_READY:
1227 r = parse_boolean(optarg);
baaa35ad
ZJS		 1228 if (r < 0)
1229 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
1230 "%s is not a valid notify mode. Valid modes are: yes, no, and ready.", optarg);
9c1e04d0
AP		 1231 arg_notify_ready = r;
1232 arg_settings_mask |= SETTING_NOTIFY_READY;
1233 break;
1234
4623e8e6
LP		 1235 case ARG_ROOT_HASH: {
1236 void *k;
1237 size_t l;
1238
1239 r = unhexmem(optarg, strlen(optarg), &k, &l);
1240 if (r < 0)
1241 return log_error_errno(r, "Failed to parse root hash: %s", optarg);
1242 if (l < sizeof(sd_id128_t)) {
4623e8e6 1243 free(k);
c6147113 1244 return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "Root hash must be at least 128bit long: %s", optarg);
4623e8e6
LP		 1245 }
1246
1247 free(arg_root_hash);
1248 arg_root_hash = k;
1249 arg_root_hash_size = l;
1250 break;
1251 }
1252
960e4569
LP		 1253 case ARG_SYSTEM_CALL_FILTER: {
1254 bool negative;
1255 const char *items;
1256
1257 negative = optarg[0] == '~';
1258 items = negative ? optarg + 1 : optarg;
1259
1260 for (;;) {
1261 _cleanup_free_ char *word = NULL;
1262
1263 r = extract_first_word(&items, &word, NULL, 0);
1264 if (r == 0)
1265 break;
1266 if (r == -ENOMEM)
1267 return log_oom();
1268 if (r < 0)
1269 return log_error_errno(r, "Failed to parse system call filter: %m");
1270
1271 if (negative)
1272 r = strv_extend(&arg_syscall_blacklist, word);
1273 else
1274 r = strv_extend(&arg_syscall_whitelist, word);
1275 if (r < 0)
1276 return log_oom();
1277 }
1278
1279 arg_settings_mask |= SETTING_SYSCALL_FILTER;
1280 break;
1281 }
1282
bf428efb
LP		 1283 case ARG_RLIMIT: {
1284 const char *eq;
1285 char *name;
1286 int rl;
1287
5c828e66
LP		 1288 if (streq(optarg, "help")) {
1289 DUMP_STRING_TABLE(rlimit, int, _RLIMIT_MAX);
1290 return 0;
1291 }
1292
bf428efb 1293 eq = strchr(optarg, '=');
baaa35ad
ZJS		 1294 if (!eq)
1295 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
1296 "--rlimit= expects an '=' assignment.");
bf428efb
LP		 1297
1298 name = strndup(optarg, eq - optarg);
1299 if (!name)
1300 return log_oom();
1301
1302 rl = rlimit_from_string_harder(name);
baaa35ad
ZJS		 1303 if (rl < 0)
1304 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
1305 "Unknown resource limit: %s", name);
bf428efb
LP		 1306
1307 if (!arg_rlimit[rl]) {
1308 arg_rlimit[rl] = new0(struct rlimit, 1);
1309 if (!arg_rlimit[rl])
1310 return log_oom();
1311 }
1312
1313 r = rlimit_parse(rl, eq + 1, arg_rlimit[rl]);
1314 if (r < 0)
1315 return log_error_errno(r, "Failed to parse resource limit: %s", eq + 1);
1316
1317 arg_settings_mask |= SETTING_RLIMIT_FIRST << rl;
1318 break;
1319 }
1320
81f345df
LP		 1321 case ARG_OOM_SCORE_ADJUST:
1322 r = parse_oom_score_adjust(optarg, &arg_oom_score_adjust);
1323 if (r < 0)
1324 return log_error_errno(r, "Failed to parse --oom-score-adjust= parameter: %s", optarg);
1325
1326 arg_oom_score_adjust_set = true;
1327 arg_settings_mask |= SETTING_OOM_SCORE_ADJUST;
1328 break;
1329
d107bb7d 1330 case ARG_CPU_AFFINITY: {
0985c7c4 1331 CPUSet cpuset;
d107bb7d
LP		 1332
1333 r = parse_cpu_set(optarg, &cpuset);
1334 if (r < 0)
0985c7c4 1335 return log_error_errno(r, "Failed to parse CPU affinity mask %s: %m", optarg);
d107bb7d 1336
0985c7c4
ZJS		 1337 cpu_set_reset(&arg_cpu_set);
1338 arg_cpu_set = cpuset;
d107bb7d
LP		 1339 arg_settings_mask |= SETTING_CPU_AFFINITY;
1340 break;
1341 }
1342
09d423e9
LP		 1343 case ARG_RESOLV_CONF:
1344 if (streq(optarg, "help")) {
1345 DUMP_STRING_TABLE(resolv_conf_mode, ResolvConfMode, _RESOLV_CONF_MODE_MAX);
1346 return 0;
1347 }
1348
1349 arg_resolv_conf = resolv_conf_mode_from_string(optarg);
baaa35ad
ZJS		 1350 if (arg_resolv_conf < 0)
1351 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
1352 "Failed to parse /etc/resolv.conf mode: %s", optarg);
09d423e9
LP		 1353
1354 arg_settings_mask |= SETTING_RESOLV_CONF;
1355 break;
1356
1688841f
LP		 1357 case ARG_TIMEZONE:
1358 if (streq(optarg, "help")) {
1359 DUMP_STRING_TABLE(timezone_mode, TimezoneMode, _TIMEZONE_MODE_MAX);
1360 return 0;
1361 }
1362
1363 arg_timezone = timezone_mode_from_string(optarg);
baaa35ad
ZJS		 1364 if (arg_timezone < 0)
1365 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
1366 "Failed to parse /etc/localtime mode: %s", optarg);
1688841f
LP		 1367
1368 arg_settings_mask |= SETTING_TIMEZONE;
1369 break;
1370
de40a303
LP		 1371 case ARG_CONSOLE:
1372 if (streq(optarg, "interactive"))
1373 arg_console_mode = CONSOLE_INTERACTIVE;
1374 else if (streq(optarg, "read-only"))
1375 arg_console_mode = CONSOLE_READ_ONLY;
1376 else if (streq(optarg, "passive"))
1377 arg_console_mode = CONSOLE_PASSIVE;
1378 else if (streq(optarg, "pipe"))
1379 arg_console_mode = CONSOLE_PIPE;
1380 else if (streq(optarg, "help"))
1381 puts("interactive\n"
1382 "read-only\n"
1383 "passive\n"
1384 "pipe");
c6147113
LP		 1385 else
1386 return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "Unknown console mode: %s", optarg);
de40a303
LP		 1387
1388 arg_settings_mask |= SETTING_CONSOLE_MODE;
1389 break;
1390
1391 case 'P':
1392 case ARG_PIPE:
1393 arg_console_mode = CONSOLE_PIPE;
1394 arg_settings_mask |= SETTING_CONSOLE_MODE;
1395 break;
1396
bb068de0
ZJS		 1397 case ARG_NO_PAGER:
1398 arg_pager_flags |= PAGER_DISABLE;
1399 break;
1400
88213476
LP		 1401 case '?':
1402 return -EINVAL;
1403
1404 default:
eb9da376 1405 assert_not_reached("Unhandled option");
88213476 1406 }
88213476 1407
60f1ec13
LP		 1408 if (argc > optind) {
1409 strv_free(arg_parameters);
1410 arg_parameters = strv_copy(argv + optind);
1411 if (!arg_parameters)
1412 return log_oom();
d7bea6b6 1413
60f1ec13
LP		 1414 arg_settings_mask |= SETTING_START_MODE;
1415 }
1416
1417 if (arg_ephemeral && arg_template && !arg_directory)
1418 /* User asked for ephemeral execution but specified --template= instead of --directory=. Semantically
1419 * such an invocation makes some sense, see https://github.com/systemd/systemd/issues/3667. Let's
1420 * accept this here, and silently make "--ephemeral --template=" equivalent to "--ephemeral
1421 * --directory=". */
1422 arg_directory = TAKE_PTR(arg_template);
1423
bd4b15f2 1424 arg_caps_retain = (arg_caps_retain | plus | (arg_private_network ? UINT64_C(1) << CAP_NET_ADMIN : 0)) & ~minus;
60f1ec13 1425
de40a303
LP		 1426 /* Make sure to parse environment before we reset the settings mask below */
1427 parse_environment();
1428
60f1ec13
LP		 1429 /* Load all settings from .nspawn files */
1430 if (mask_no_settings)
1431 arg_settings_mask = 0;
1432
1433 /* Don't load any settings from .nspawn files */
1434 if (mask_all_settings)
1435 arg_settings_mask = _SETTINGS_MASK_ALL;
1436
1437 return 1;
1438}
1439
1440static int verify_arguments(void) {
1441 int r;
a6b5216c 1442
4f086aab
SU		 1443 if (arg_userns_mode != USER_NAMESPACE_NO)
1444 arg_mount_settings |= MOUNT_USE_USERNS;
1445
1446 if (arg_private_network)
1447 arg_mount_settings |= MOUNT_APPLY_APIVFS_NETNS;
1448
48a8d337
LB		 1449 if (!(arg_clone_ns_flags & CLONE_NEWPID) ||
1450 !(arg_clone_ns_flags & CLONE_NEWUTS)) {
eb91eb18 1451 arg_register = false;
baaa35ad 1452 if (arg_start_mode != START_PID1)
60f1ec13 1453 return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "--boot cannot be used without namespacing.");
0c582db0 1454 }
eb91eb18 1455
0de7acce 1456 if (arg_userns_mode == USER_NAMESPACE_PICK)
0e7ac751
LP		 1457 arg_userns_chown = true;
1458
60f1ec13
LP		 1459 if (arg_start_mode == START_BOOT && arg_kill_signal <= 0)
1460 arg_kill_signal = SIGRTMIN+3;
1461
e5a4bb0d
LP		 1462 if (arg_volatile_mode != VOLATILE_NO) /* Make sure all file systems contained in the image are mounted read-only if we are in volatile mode */
1463 arg_read_only = true;
1464
baaa35ad 1465 if (arg_keep_unit && arg_register && cg_pid_get_owner_uid(0, NULL) >= 0)
8d9c2bca
AJ		 1466 /* Save the user from accidentally registering either user-$SESSION.scope or user@.service.
1467 * The latter is not technically a user session, but we don't need to labour the point. */
60f1ec13 1468 return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "--keep-unit --register=yes may not be used when invoked from a user session.");
89f7c846 1469
baaa35ad 1470 if (arg_directory && arg_image)
60f1ec13 1471 return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "--directory= and --image= may not be combined.");
1b9e5b12 1472
baaa35ad 1473 if (arg_template && arg_image)
60f1ec13 1474 return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "--template= and --image= may not be combined.");
8cd328d8 1475
baaa35ad 1476 if (arg_template && !(arg_directory || arg_machine))
60f1ec13 1477 return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "--template= needs --directory= or --machine=.");
ec16945e 1478
baaa35ad 1479 if (arg_ephemeral && arg_template)
60f1ec13 1480 return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "--ephemeral and --template= may not be combined.");
ec16945e 1481
baaa35ad 1482 if (arg_ephemeral && !IN_SET(arg_link_journal, LINK_NO, LINK_AUTO))
60f1ec13 1483 return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "--ephemeral and --link-journal= may not be combined.");
df9a75e4 1484
baaa35ad 1485 if (arg_userns_mode != USER_NAMESPACE_NO && !userns_supported())
60f1ec13 1486 return log_error_errno(SYNTHETIC_ERRNO(EOPNOTSUPP), "--private-users= is not supported, kernel compiled without user namespace support.");
7336138e 1487
baaa35ad 1488 if (arg_userns_chown && arg_read_only)
de40a303
LP		 1489 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
1490 "--read-only and --private-users-chown may not be combined.");
f757855e 1491
e5a4bb0d
LP		 1492 /* We don't support --private-users-chown together with any of the volatile modes since we couldn't
1493 * change the read-only part of the tree (i.e. /usr) anyway, or because it would trigger a massive
5238e957 1494 * copy-up (in case of overlay) making the entire exercise pointless. */
e5a4bb0d
LP		 1495 if (arg_userns_chown && arg_volatile_mode != VOLATILE_NO)
1496 return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "--volatile= and --private-users-chown may not be combined.");
1497
de40a303
LP		 1498 /* If --network-namespace-path is given with any other network-related option, we need to error out,
1499 * to avoid conflicts between different network options. */
60f1ec13
LP		 1500 if (arg_network_namespace_path &&
1501 (arg_network_interfaces || arg_network_macvlan ||
1502 arg_network_ipvlan || arg_network_veth_extra ||
1503 arg_network_bridge || arg_network_zone ||
1504 arg_network_veth || arg_private_network))
de40a303 1505 return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "--network-namespace-path= cannot be combined with other network options.");
86c0dd4a 1506
60f1ec13 1507 if (arg_network_bridge && arg_network_zone)
de40a303
LP		 1508 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
1509 "--network-bridge= and --network-zone= may not be combined.");
f757855e 1510
baaa35ad 1511 if (arg_userns_mode != USER_NAMESPACE_NO && (arg_mount_settings & MOUNT_APPLY_APIVFS_NETNS) && !arg_private_network)
60f1ec13 1512 return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "Invalid namespacing settings. Mounting sysfs with --private-users requires --private-network.");
4f086aab 1513
baaa35ad 1514 if (arg_userns_mode != USER_NAMESPACE_NO && !(arg_mount_settings & MOUNT_APPLY_APIVFS_RO))
60f1ec13 1515 return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "Cannot combine --private-users with read-write mounts.");
f757855e 1516
baaa35ad 1517 if (arg_expose_ports && !arg_private_network)
60f1ec13 1518 return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "Cannot use --port= without private networking.");
6d0b55c2 1519
349cc4a5 1520#if ! HAVE_LIBIPTC
baaa35ad 1521 if (arg_expose_ports)
60f1ec13 1522 return log_error_errno(SYNTHETIC_ERRNO(EOPNOTSUPP), "--port= is not supported, compiled without libiptc support.");
1c1ea217
EV		 1523#endif
1524
60f1ec13
LP		 1525 r = custom_mount_check_all();
1526 if (r < 0)
1527 return r;
c6c8f6e2 1528
f757855e 1529 return 0;
88213476
LP		 1530}
1531
03cfe0d5
LP		 1532static int userns_lchown(const char *p, uid_t uid, gid_t gid) {
1533 assert(p);
1534
0de7acce 1535 if (arg_userns_mode == USER_NAMESPACE_NO)
03cfe0d5
LP		 1536 return 0;
1537
1538 if (uid == UID_INVALID && gid == GID_INVALID)
1539 return 0;
1540
1541 if (uid != UID_INVALID) {
1542 uid += arg_uid_shift;
1543
1544 if (uid < arg_uid_shift || uid >= arg_uid_shift + arg_uid_range)
1545 return -EOVERFLOW;
1546 }
1547
1548 if (gid != GID_INVALID) {
1549 gid += (gid_t) arg_uid_shift;
1550
1551 if (gid < (gid_t) arg_uid_shift || gid >= (gid_t) (arg_uid_shift + arg_uid_range))
1552 return -EOVERFLOW;
1553 }
1554
1555 if (lchown(p, uid, gid) < 0)
1556 return -errno;
b12afc8c
LP		 1557
1558 return 0;
1559}
1560
03cfe0d5
LP		 1561static int userns_mkdir(const char *root, const char *path, mode_t mode, uid_t uid, gid_t gid) {
1562 const char *q;
dae8b82e 1563 int r;
03cfe0d5
LP		 1564
1565 q = prefix_roota(root, path);
dae8b82e
ZJS		 1566 r = mkdir_errno_wrapper(q, mode);
1567 if (r == -EEXIST)
1568 return 0;
1569 if (r < 0)
1570 return r;
03cfe0d5
LP		 1571
1572 return userns_lchown(q, uid, gid);
1573}
1574
1688841f 1575static const char *timezone_from_path(const char *path) {
da9fc98d
LP		 1576 return PATH_STARTSWITH_SET(
1577 path,
1578 "../usr/share/zoneinfo/",
1579 "/usr/share/zoneinfo/");
1688841f
LP		 1580}
1581
83205269
LP		 1582static bool etc_writable(void) {
1583 return !arg_read_only || IN_SET(arg_volatile_mode, VOLATILE_YES, VOLATILE_OVERLAY);
1584}
1585
e58a1277 1586static int setup_timezone(const char *dest) {
1688841f
LP		 1587 _cleanup_free_ char *p = NULL, *etc = NULL;
1588 const char *where, *check;
1589 TimezoneMode m;
d4036145 1590 int r;
f8440af5 1591
e58a1277
LP		 1592 assert(dest);
1593
1688841f 1594 if (IN_SET(arg_timezone, TIMEZONE_AUTO, TIMEZONE_SYMLINK)) {
1688841f
LP		 1595 r = readlink_malloc("/etc/localtime", &p);
1596 if (r == -ENOENT && arg_timezone == TIMEZONE_AUTO)
83205269 1597 m = etc_writable() ? TIMEZONE_DELETE : TIMEZONE_OFF;
1688841f 1598 else if (r == -EINVAL && arg_timezone == TIMEZONE_AUTO) /* regular file? */
83205269 1599 m = etc_writable() ? TIMEZONE_COPY : TIMEZONE_BIND;
1688841f
LP		 1600 else if (r < 0) {
1601 log_warning_errno(r, "Failed to read host's /etc/localtime symlink, not updating container timezone: %m");
1602 /* To handle warning, delete /etc/localtime and replace it with a symbolic link to a time zone data
1603 * file.
1604 *
1605 * Example:
1606 * ln -s /usr/share/zoneinfo/UTC /etc/localtime
1607 */
1608 return 0;
1609 } else if (arg_timezone == TIMEZONE_AUTO)
83205269 1610 m = etc_writable() ? TIMEZONE_SYMLINK : TIMEZONE_BIND;
1688841f
LP		 1611 else
1612 m = arg_timezone;
1613 } else
1614 m = arg_timezone;
1615
1616 if (m == TIMEZONE_OFF)
1617 return 0;
1618
1619 r = chase_symlinks("/etc", dest, CHASE_PREFIX_ROOT, &etc);
d4036145 1620 if (r < 0) {
1688841f 1621 log_warning_errno(r, "Failed to resolve /etc path in container, ignoring: %m");
d4036145
LP		 1622 return 0;
1623 }
1624
1688841f
LP		 1625 where = strjoina(etc, "/localtime");
1626
1627 switch (m) {
1628
1629 case TIMEZONE_DELETE:
1630 if (unlink(where) < 0)
1631 log_full_errno(errno == ENOENT ? LOG_DEBUG : LOG_WARNING, errno, "Failed to remove '%s', ignoring: %m", where);
1632
d4036145 1633 return 0;
d4036145 1634
1688841f
LP		 1635 case TIMEZONE_SYMLINK: {
1636 _cleanup_free_ char *q = NULL;
1637 const char *z, *what;
4d1c38b8 1638
1688841f
LP		 1639 z = timezone_from_path(p);
1640 if (!z) {
1641 log_warning("/etc/localtime does not point into /usr/share/zoneinfo/, not updating container timezone.");
d4036145 1642 return 0;
1688841f 1643 }
d4036145 1644
1688841f
LP		 1645 r = readlink_malloc(where, &q);
1646 if (r >= 0 && streq_ptr(timezone_from_path(q), z))
1647 return 0; /* Already pointing to the right place? Then do nothing .. */
1648
1649 check = strjoina(dest, "/usr/share/zoneinfo/", z);
1650 r = chase_symlinks(check, dest, 0, NULL);
1651 if (r < 0)
1652 log_debug_errno(r, "Timezone %s does not exist (or is not accessible) in container, not creating symlink: %m", z);
1653 else {
1654 if (unlink(where) < 0 && errno != ENOENT) {
1655 log_full_errno(IN_SET(errno, EROFS, EACCES, EPERM) ? LOG_DEBUG : LOG_WARNING, /* Don't complain on read-only images */
1656 errno, "Failed to remove existing timezone info %s in container, ignoring: %m", where);
1657 return 0;
1658 }
1659
1660 what = strjoina("../usr/share/zoneinfo/", z);
1661 if (symlink(what, where) < 0) {
1662 log_full_errno(IN_SET(errno, EROFS, EACCES, EPERM) ? LOG_DEBUG : LOG_WARNING,
1663 errno, "Failed to correct timezone of container, ignoring: %m");
1664 return 0;
1665 }
1666
1667 break;
1668 }
1669
1670 _fallthrough_;
d4036145 1671 }
68fb0892 1672
1688841f
LP		 1673 case TIMEZONE_BIND: {
1674 _cleanup_free_ char *resolved = NULL;
1675 int found;
1676
1677 found = chase_symlinks(where, dest, CHASE_NONEXISTENT, &resolved);
1678 if (found < 0) {
1679 log_warning_errno(found, "Failed to resolve /etc/localtime path in container, ignoring: %m");
1680 return 0;
1681 }
1682
1683 if (found == 0) /* missing? */
1684 (void) touch(resolved);
1685
1686 r = mount_verbose(LOG_WARNING, "/etc/localtime", resolved, NULL, MS_BIND, NULL);
1687 if (r >= 0)
1688 return mount_verbose(LOG_ERR, NULL, resolved, NULL, MS_BIND|MS_REMOUNT|MS_RDONLY|MS_NOSUID|MS_NODEV, NULL);
1689
1690 _fallthrough_;
79d80fc1 1691 }
4d9f07b4 1692
1688841f
LP		 1693 case TIMEZONE_COPY:
1694 /* If mounting failed, try to copy */
8a016c74 1695 r = copy_file_atomic("/etc/localtime", where, 0644, 0, 0, COPY_REFLINK|COPY_REPLACE);
1688841f
LP		 1696 if (r < 0) {
1697 log_full_errno(IN_SET(r, -EROFS, -EACCES, -EPERM) ? LOG_DEBUG : LOG_WARNING, r,
1698 "Failed to copy /etc/localtime to %s, ignoring: %m", where);
1699 return 0;
1700 }
1701
1702 break;
1703
1704 default:
1705 assert_not_reached("unexpected mode");
d4036145 1706 }
e58a1277 1707
1688841f 1708 /* Fix permissions of the symlink or file copy we just created */
03cfe0d5
LP		 1709 r = userns_lchown(where, 0, 0);
1710 if (r < 0)
1688841f 1711 log_warning_errno(r, "Failed to chown /etc/localtime, ignoring: %m");
03cfe0d5 1712
e58a1277 1713 return 0;
88213476
LP		 1714}
1715
09d423e9
LP		 1716static int have_resolv_conf(const char *path) {
1717 assert(path);
1718
1719 if (access(path, F_OK) < 0) {
1720 if (errno == ENOENT)
1721 return 0;
1722
1723 return log_debug_errno(errno, "Failed to determine whether '%s' is available: %m", path);
1724 }
1725
1726 return 1;
1727}
1728
7357272e 1729static int resolved_listening(void) {
b8ea7a6e 1730 _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL;
b053cd5f 1731 _cleanup_(sd_bus_flush_close_unrefp) sd_bus *bus = NULL;
7357272e 1732 _cleanup_free_ char *dns_stub_listener_mode = NULL;
b053cd5f
LP		 1733 int r;
1734
7357272e 1735 /* Check if resolved is listening */
b053cd5f
LP		 1736
1737 r = sd_bus_open_system(&bus);
1738 if (r < 0)
b8ea7a6e 1739 return log_debug_errno(r, "Failed to open system bus: %m");
b053cd5f 1740
7357272e 1741 r = bus_name_has_owner(bus, "org.freedesktop.resolve1", NULL);
b8ea7a6e
LP		 1742 if (r < 0)
1743 return log_debug_errno(r, "Failed to check whether the 'org.freedesktop.resolve1' bus name is taken: %m");
1744 if (r == 0)
1745 return 0;
7357272e
DM		 1746
1747 r = sd_bus_get_property_string(bus,
1748 "org.freedesktop.resolve1",
1749 "/org/freedesktop/resolve1",
1750 "org.freedesktop.resolve1.Manager",
1751 "DNSStubListener",
b8ea7a6e 1752 &error,
7357272e
DM		 1753 &dns_stub_listener_mode);
1754 if (r < 0)
b8ea7a6e 1755 return log_debug_errno(r, "Failed to query DNSStubListener property: %s", bus_error_message(&error, r));
7357272e
DM		 1756
1757 return STR_IN_SET(dns_stub_listener_mode, "udp", "yes");
b053cd5f
LP		 1758}
1759
2547bb41 1760static int setup_resolv_conf(const char *dest) {
09d423e9
LP		 1761 _cleanup_free_ char *etc = NULL;
1762 const char *where, *what;
1763 ResolvConfMode m;
1764 int r;
2547bb41
LP		 1765
1766 assert(dest);
1767
09d423e9
LP		 1768 if (arg_resolv_conf == RESOLV_CONF_AUTO) {
1769 if (arg_private_network)
1770 m = RESOLV_CONF_OFF;
1771 else if (have_resolv_conf(STATIC_RESOLV_CONF) > 0 && resolved_listening() > 0)
83205269 1772 m = etc_writable() ? RESOLV_CONF_COPY_STATIC : RESOLV_CONF_BIND_STATIC;
09d423e9 1773 else if (have_resolv_conf("/etc/resolv.conf") > 0)
83205269 1774 m = etc_writable() ? RESOLV_CONF_COPY_HOST : RESOLV_CONF_BIND_HOST;
09d423e9 1775 else
83205269 1776 m = etc_writable() ? RESOLV_CONF_DELETE : RESOLV_CONF_OFF;
09d423e9
LP		 1777 } else
1778 m = arg_resolv_conf;
1779
1780 if (m == RESOLV_CONF_OFF)
2547bb41
LP		 1781 return 0;
1782
87447ae4
LP		 1783 r = chase_symlinks("/etc", dest, CHASE_PREFIX_ROOT, &etc);
1784 if (r < 0) {
1785 log_warning_errno(r, "Failed to resolve /etc path in container, ignoring: %m");
1786 return 0;
1787 }
1788
1789 where = strjoina(etc, "/resolv.conf");
09d423e9
LP		 1790
1791 if (m == RESOLV_CONF_DELETE) {
1792 if (unlink(where) < 0)
1793 log_full_errno(errno == ENOENT ? LOG_DEBUG : LOG_WARNING, errno, "Failed to remove '%s', ignoring: %m", where);
1794
87447ae4
LP		 1795 return 0;
1796 }
79d80fc1 1797
09d423e9
LP		 1798 if (IN_SET(m, RESOLV_CONF_BIND_STATIC, RESOLV_CONF_COPY_STATIC))
1799 what = STATIC_RESOLV_CONF;
1800 else
1801 what = "/etc/resolv.conf";
87447ae4 1802
09d423e9
LP		 1803 if (IN_SET(m, RESOLV_CONF_BIND_HOST, RESOLV_CONF_BIND_STATIC)) {
1804 _cleanup_free_ char *resolved = NULL;
1805 int found;
1806
1807 found = chase_symlinks(where, dest, CHASE_NONEXISTENT, &resolved);
1808 if (found < 0) {
1809 log_warning_errno(found, "Failed to resolve /etc/resolv.conf path in container, ignoring: %m");
1810 return 0;
1811 }
3539724c 1812
87447ae4
LP		 1813 if (found == 0) /* missing? */
1814 (void) touch(resolved);
5367354d 1815
09d423e9 1816 r = mount_verbose(LOG_WARNING, what, resolved, NULL, MS_BIND, NULL);
60e76d48 1817 if (r >= 0)
87447ae4 1818 return mount_verbose(LOG_ERR, NULL, resolved, NULL, MS_BIND|MS_REMOUNT|MS_RDONLY|MS_NOSUID|MS_NODEV, NULL);
3539724c
LP		 1819 }
1820
1821 /* If that didn't work, let's copy the file */
8a016c74 1822 r = copy_file(what, where, O_TRUNC|O_NOFOLLOW, 0644, 0, 0, COPY_REFLINK);
79d80fc1 1823 if (r < 0) {
3539724c
LP		 1824 /* If the file already exists as symlink, let's suppress the warning, under the assumption that
1825 * resolved or something similar runs inside and the symlink points there.
68a313c5 1826 *
3539724c 1827 * If the disk image is read-only, there's also no point in complaining.
68a313c5 1828 */
09d423e9 1829 log_full_errno(!IN_SET(RESOLV_CONF_COPY_HOST, RESOLV_CONF_COPY_STATIC) && IN_SET(r, -ELOOP, -EROFS, -EACCES, -EPERM) ? LOG_DEBUG : LOG_WARNING, r,
3539724c 1830 "Failed to copy /etc/resolv.conf to %s, ignoring: %m", where);
79d80fc1
TG		 1831 return 0;
1832 }
2547bb41 1833
03cfe0d5
LP		 1834 r = userns_lchown(where, 0, 0);
1835 if (r < 0)
3539724c 1836 log_warning_errno(r, "Failed to chown /etc/resolv.conf, ignoring: %m");
03cfe0d5 1837
2547bb41
LP		 1838 return 0;
1839}
1840
1e4f1671 1841static int setup_boot_id(void) {
cdde6ba6
LP		 1842 _cleanup_(unlink_and_freep) char *from = NULL;
1843 _cleanup_free_ char *path = NULL;
3bbaff3e 1844 sd_id128_t rnd = SD_ID128_NULL;
cdde6ba6 1845 const char *to;
04bc4a3f
LP		 1846 int r;
1847
1eacc470 1848 /* Generate a new randomized boot ID, so that each boot-up of the container gets a new one */
04bc4a3f 1849
1eacc470 1850 r = tempfn_random_child("/run", "proc-sys-kernel-random-boot-id", &path);
cdde6ba6
LP		 1851 if (r < 0)
1852 return log_error_errno(r, "Failed to generate random boot ID path: %m");
04bc4a3f
LP		 1853
1854 r = sd_id128_randomize(&rnd);
f647962d
MS		 1855 if (r < 0)
1856 return log_error_errno(r, "Failed to generate random boot id: %m");
04bc4a3f 1857
cdde6ba6 1858 r = id128_write(path, ID128_UUID, rnd, false);
f647962d
MS		 1859 if (r < 0)
1860 return log_error_errno(r, "Failed to write boot id: %m");
04bc4a3f 1861
cdde6ba6
LP		 1862 from = TAKE_PTR(path);
1863 to = "/proc/sys/kernel/random/boot_id";
1864
60e76d48 1865 r = mount_verbose(LOG_ERR, from, to, NULL, MS_BIND, NULL);
cdde6ba6
LP		 1866 if (r < 0)
1867 return r;
04bc4a3f 1868
cdde6ba6 1869 return mount_verbose(LOG_ERR, NULL, to, NULL, MS_BIND|MS_REMOUNT|MS_RDONLY|MS_NOSUID|MS_NOEXEC|MS_NODEV, NULL);
04bc4a3f
LP		 1870}
1871
e58a1277 1872static int copy_devnodes(const char *dest) {
88213476
LP		 1873 static const char devnodes[] =
1874 "null\0"
1875 "zero\0"
1876 "full\0"
1877 "random\0"
1878 "urandom\0"
85614d66
TG		 1879 "tty\0"
1880 "net/tun\0";
88213476 1881
de40a303 1882 _cleanup_umask_ mode_t u;
88213476 1883 const char *d;
e58a1277 1884 int r = 0;
a258bf26
LP		 1885
1886 assert(dest);
124640f1
LP		 1887
1888 u = umask(0000);
88213476 1889
03cfe0d5
LP		 1890 /* Create /dev/net, so that we can create /dev/net/tun in it */
1891 if (userns_mkdir(dest, "/dev/net", 0755, 0, 0) < 0)
1892 return log_error_errno(r, "Failed to create /dev/net directory: %m");
1893
88213476 1894 NULSTR_FOREACH(d, devnodes) {
7fd1b19b 1895 _cleanup_free_ char *from = NULL, *to = NULL;
7f112f50 1896 struct stat st;
88213476 1897
7f112f50 1898 from = strappend("/dev/", d);
8967f291
LP		 1899 if (!from)
1900 return log_oom();
1901
03cfe0d5 1902 to = prefix_root(dest, from);
8967f291
LP		 1903 if (!to)
1904 return log_oom();
88213476
LP		 1905
1906 if (stat(from, &st) < 0) {
1907
4a62c710
MS		 1908 if (errno != ENOENT)
1909 return log_error_errno(errno, "Failed to stat %s: %m", from);
88213476 1910
baaa35ad
ZJS		 1911 } else if (!S_ISCHR(st.st_mode) && !S_ISBLK(st.st_mode))
1912 return log_error_errno(SYNTHETIC_ERRNO(EIO),
1913 "%s is not a char or block device, cannot copy.", from);
1914 else {
8dfce114
LP		 1915 _cleanup_free_ char *sl = NULL, *prefixed = NULL, *dn = NULL, *t = NULL;
1916
81f5049b 1917 if (mknod(to, st.st_mode, st.st_rdev) < 0) {
8dbf71ec 1918 /* Explicitly warn the user when /dev is already populated. */
41eb4362 1919 if (errno == EEXIST)
8dbf71ec 1920 log_notice("%s/dev is pre-mounted and pre-populated. If a pre-mounted /dev is provided it needs to be an unpopulated file system.", dest);
81f5049b
AC		 1921 if (errno != EPERM)
1922 return log_error_errno(errno, "mknod(%s) failed: %m", to);
1923
8dfce114 1924 /* Some systems abusively restrict mknod but allow bind mounts. */
81f5049b
AC		 1925 r = touch(to);
1926 if (r < 0)
1927 return log_error_errno(r, "touch (%s) failed: %m", to);
60e76d48
ZJS		 1928 r = mount_verbose(LOG_DEBUG, from, to, NULL, MS_BIND, NULL);
1929 if (r < 0)
1930 return log_error_errno(r, "Both mknod and bind mount (%s) failed: %m", to);
81f5049b 1931 }
6278cf60 1932
03cfe0d5
LP		 1933 r = userns_lchown(to, 0, 0);
1934 if (r < 0)
1935 return log_error_errno(r, "chown() of device node %s failed: %m", to);
8dfce114
LP		 1936
1937 dn = strjoin("/dev/", S_ISCHR(st.st_mode) ? "char" : "block");
1938 if (!dn)
1939 return log_oom();
1940
1941 r = userns_mkdir(dest, dn, 0755, 0, 0);
1942 if (r < 0)
1943 return log_error_errno(r, "Failed to create '%s': %m", dn);
1944
1945 if (asprintf(&sl, "%s/%u:%u", dn, major(st.st_rdev), minor(st.st_rdev)) < 0)
1946 return log_oom();
1947
1948 prefixed = prefix_root(dest, sl);
1949 if (!prefixed)
1950 return log_oom();
1951
1952 t = strjoin("../", d);
1953 if (!t)
1954 return log_oom();
1955
1956 if (symlink(t, prefixed) < 0)
1957 log_debug_errno(errno, "Failed to symlink '%s' to '%s': %m", t, prefixed);
88213476 1958 }
88213476
LP		 1959 }
1960
e58a1277
LP		 1961 return r;
1962}
88213476 1963
de40a303
LP		 1964static int make_extra_nodes(const char *dest) {
1965 _cleanup_umask_ mode_t u;
1966 size_t i;
1967 int r;
1968
1969 u = umask(0000);
1970
1971 for (i = 0; i < arg_n_extra_nodes; i++) {
1972 _cleanup_free_ char *path = NULL;
1973 DeviceNode *n = arg_extra_nodes + i;
1974
1975 path = prefix_root(dest, n->path);
1976 if (!path)
1977 return log_oom();
1978
1979 if (mknod(path, n->mode, S_ISCHR(n->mode) || S_ISBLK(n->mode) ? makedev(n->major, n->minor) : 0) < 0)
1980 return log_error_errno(errno, "Failed to create device node '%s': %m", path);
1981
1982 r = chmod_and_chown(path, n->mode, n->uid, n->gid);
1983 if (r < 0)
1984 return log_error_errno(r, "Failed to adjust device node ownership of '%s': %m", path);
1985 }
1986
1987 return 0;
1988}
1989
03cfe0d5
LP		 1990static int setup_pts(const char *dest) {
1991 _cleanup_free_ char *options = NULL;
1992 const char *p;
709f6e46 1993 int r;
03cfe0d5 1994
349cc4a5 1995#if HAVE_SELINUX
03cfe0d5
LP		 1996 if (arg_selinux_apifs_context)
1997 (void) asprintf(&options,
3dce8915 1998 "newinstance,ptmxmode=0666,mode=620,gid=" GID_FMT ",context=\"%s\"",
03cfe0d5
LP		 1999 arg_uid_shift + TTY_GID,
2000 arg_selinux_apifs_context);
2001 else
2002#endif
2003 (void) asprintf(&options,
3dce8915 2004 "newinstance,ptmxmode=0666,mode=620,gid=" GID_FMT,
03cfe0d5 2005 arg_uid_shift + TTY_GID);
f2d88580 2006
03cfe0d5 2007 if (!options)
f2d88580
LP		 2008 return log_oom();
2009
03cfe0d5 2010 /* Mount /dev/pts itself */
cc9fce65 2011 p = prefix_roota(dest, "/dev/pts");
dae8b82e
ZJS		 2012 r = mkdir_errno_wrapper(p, 0755);
2013 if (r < 0)
2014 return log_error_errno(r, "Failed to create /dev/pts: %m");
2015
60e76d48
ZJS		 2016 r = mount_verbose(LOG_ERR, "devpts", p, "devpts", MS_NOSUID|MS_NOEXEC, options);
2017 if (r < 0)
2018 return r;
709f6e46
MS		 2019 r = userns_lchown(p, 0, 0);
2020 if (r < 0)
2021 return log_error_errno(r, "Failed to chown /dev/pts: %m");
03cfe0d5
LP		 2022
2023 /* Create /dev/ptmx symlink */
2024 p = prefix_roota(dest, "/dev/ptmx");
4a62c710
MS		 2025 if (symlink("pts/ptmx", p) < 0)
2026 return log_error_errno(errno, "Failed to create /dev/ptmx symlink: %m");
709f6e46
MS		 2027 r = userns_lchown(p, 0, 0);
2028 if (r < 0)
2029 return log_error_errno(r, "Failed to chown /dev/ptmx: %m");
f2d88580 2030
03cfe0d5
LP		 2031 /* And fix /dev/pts/ptmx ownership */
2032 p = prefix_roota(dest, "/dev/pts/ptmx");
709f6e46
MS		 2033 r = userns_lchown(p, 0, 0);
2034 if (r < 0)
2035 return log_error_errno(r, "Failed to chown /dev/pts/ptmx: %m");
6278cf60 2036
f2d88580
LP		 2037 return 0;
2038}
2039
3acc84eb
FB		 2040static int setup_stdio_as_dev_console(void) {
2041 int terminal;
e58a1277 2042 int r;
e58a1277 2043
3acc84eb
FB		 2044 terminal = open_terminal("/dev/console", O_RDWR);
2045 if (terminal < 0)
2046 return log_error_errno(terminal, "Failed to open console: %m");
e58a1277 2047
3acc84eb
FB		 2048 /* Make sure we can continue logging to the original stderr, even if
2049 * stderr points elsewhere now */
2050 r = log_dup_console();
2051 if (r < 0)
2052 return log_error_errno(r, "Failed to duplicate stderr: %m");
de40a303 2053
3acc84eb
FB		 2054 /* invalidates 'terminal' on success and failure */
2055 r = rearrange_stdio(terminal, terminal, terminal);
f647962d 2056 if (r < 0)
3acc84eb
FB		 2057 return log_error_errno(r, "Failed to move console to stdin/stdout/stderr: %m");
2058
2059 return 0;
2060}
88213476 2061
3acc84eb
FB		 2062static int setup_dev_console(const char *console) {
2063 _cleanup_free_ char *p = NULL;
2064 int r;
a258bf26 2065
3acc84eb
FB		 2066 /* Create /dev/console symlink */
2067 r = path_make_relative("/dev", console, &p);
81f5049b 2068 if (r < 0)
3acc84eb
FB		 2069 return log_error_errno(r, "Failed to create relative path: %m");
2070
2071 if (symlink(p, "/dev/console") < 0)
2072 return log_error_errno(errno, "Failed to create /dev/console symlink: %m");
a258bf26 2073
3acc84eb 2074 return 0;
e58a1277
LP		 2075}
2076
8e5430c4
LP		 2077static int setup_keyring(void) {
2078 key_serial_t keyring;
2079
2080 /* Allocate a new session keyring for the container. This makes sure the keyring of the session systemd-nspawn
2081 * was invoked from doesn't leak into the container. Note that by default we block keyctl() and request_key()
2082 * anyway via seccomp so doing this operation isn't strictly necessary, but in case people explicitly whitelist
2083 * these system calls let's make sure we don't leak anything into the container. */
2084
2085 keyring = keyctl(KEYCTL_JOIN_SESSION_KEYRING, 0, 0, 0, 0);
2086 if (keyring == -1) {
2087 if (errno == ENOSYS)
2088 log_debug_errno(errno, "Kernel keyring not supported, ignoring.");
2089 else if (IN_SET(errno, EACCES, EPERM))
2090 log_debug_errno(errno, "Kernel keyring access prohibited, ignoring.");
2091 else
2092 return log_error_errno(errno, "Setting up kernel keyring failed: %m");
2093 }
2094
2095 return 0;
2096}
2097
1e4f1671 2098static int setup_kmsg(int kmsg_socket) {
9ec5a93c
LP		 2099 _cleanup_(unlink_and_freep) char *from = NULL;
2100 _cleanup_free_ char *fifo = NULL;
2101 _cleanup_close_ int fd = -1;
7fd1b19b 2102 _cleanup_umask_ mode_t u;
9ec5a93c 2103 int r;
e58a1277 2104
e58a1277 2105 assert(kmsg_socket >= 0);
a258bf26 2106
e58a1277 2107 u = umask(0000);
a258bf26 2108
1eacc470 2109 /* We create the kmsg FIFO as as temporary file in /run, but immediately delete it after bind mounting it to
9ec5a93c
LP		 2110 * /proc/kmsg. While FIFOs on the reading side behave very similar to /proc/kmsg, their writing side behaves
2111 * differently from /dev/kmsg in that writing blocks when nothing is reading. In order to avoid any problems
2112 * with containers deadlocking due to this we simply make /dev/kmsg unavailable to the container. */
2113
1eacc470 2114 r = tempfn_random_child("/run", "proc-kmsg", &fifo);
9ec5a93c
LP		 2115 if (r < 0)
2116 return log_error_errno(r, "Failed to generate kmsg path: %m");
e58a1277 2117
9ec5a93c 2118 if (mkfifo(fifo, 0600) < 0)
03cfe0d5 2119 return log_error_errno(errno, "mkfifo() for /run/kmsg failed: %m");
9ec5a93c
LP		 2120
2121 from = TAKE_PTR(fifo);
9ec5a93c 2122
1eacc470 2123 r = mount_verbose(LOG_ERR, from, "/proc/kmsg", NULL, MS_BIND, NULL);
60e76d48
ZJS		 2124 if (r < 0)
2125 return r;
e58a1277 2126
669fc4e5 2127 fd = open(from, O_RDWR|O_NONBLOCK|O_CLOEXEC);
4a62c710
MS		 2128 if (fd < 0)
2129 return log_error_errno(errno, "Failed to open fifo: %m");
e58a1277 2130
9ec5a93c 2131 /* Store away the fd in the socket, so that it stays open as long as we run the child */
3ee897d6 2132 r = send_one_fd(kmsg_socket, fd, 0);
d9603714
DH		 2133 if (r < 0)
2134 return log_error_errno(r, "Failed to send FIFO fd: %m");
a258bf26 2135
25ea79fe 2136 return 0;
88213476
LP		 2137}
2138
1c4baffc 2139static int on_address_change(sd_netlink *rtnl, sd_netlink_message *m, void *userdata) {
6d0b55c2
LP		 2140 union in_addr_union *exposed = userdata;
2141
2142 assert(rtnl);
2143 assert(m);
2144 assert(exposed);
2145
7a8f6325 2146 expose_port_execute(rtnl, arg_expose_ports, exposed);
6d0b55c2
LP		 2147 return 0;
2148}
2149
3a74cea5 2150static int setup_hostname(void) {
c818eef1 2151 int r;
3a74cea5 2152
0c582db0 2153 if ((arg_clone_ns_flags & CLONE_NEWUTS) == 0)
eb91eb18
LP		 2154 return 0;
2155
c818eef1
LP		 2156 r = sethostname_idempotent(arg_hostname ?: arg_machine);
2157 if (r < 0)
2158 return log_error_errno(r, "Failed to set hostname: %m");
3a74cea5 2159
7027ff61 2160 return 0;
3a74cea5
LP		 2161}
2162
57fb9fb5 2163static int setup_journal(const char *directory) {
0f5e1382 2164 _cleanup_free_ char *d = NULL;
b2238e38
LP		 2165 const char *dirname, *p, *q;
2166 sd_id128_t this_id;
2167 char id[33];
8054d749 2168 bool try;
57fb9fb5
LP		 2169 int r;
2170
df9a75e4
LP		 2171 /* Don't link journals in ephemeral mode */
2172 if (arg_ephemeral)
2173 return 0;
2174
8054d749
LP		 2175 if (arg_link_journal == LINK_NO)
2176 return 0;
2177
2178 try = arg_link_journal_try || arg_link_journal == LINK_AUTO;
2179
4d680aee 2180 r = sd_id128_get_machine(&this_id);
f647962d
MS		 2181 if (r < 0)
2182 return log_error_errno(r, "Failed to retrieve machine ID: %m");
4d680aee 2183
e01ff70a 2184 if (sd_id128_equal(arg_uuid, this_id)) {
8054d749 2185 log_full(try ? LOG_WARNING : LOG_ERR,
e192a281 2186 "Host and machine ids are equal (%s): refusing to link journals", sd_id128_to_string(arg_uuid, id));
8054d749 2187 if (try)
4d680aee 2188 return 0;
df9a75e4 2189 return -EEXIST;
4d680aee
ZJS		 2190 }
2191
369ca6da
ZJS		 2192 FOREACH_STRING(dirname, "/var", "/var/log", "/var/log/journal") {
2193 r = userns_mkdir(directory, dirname, 0755, 0, 0);
2194 if (r < 0) {
2195 bool ignore = r == -EROFS && try;
2196 log_full_errno(ignore ? LOG_DEBUG : LOG_ERR, r,
2197 "Failed to create %s%s: %m", dirname, ignore ? ", ignoring" : "");
2198 return ignore ? 0 : r;
2199 }
2200 }
03cfe0d5 2201
e01ff70a
MS		 2202 (void) sd_id128_to_string(arg_uuid, id);
2203
03cfe0d5
LP		 2204 p = strjoina("/var/log/journal/", id);
2205 q = prefix_roota(directory, p);
27407a01 2206
e1873695 2207 if (path_is_mount_point(p, NULL, 0) > 0) {
8054d749
LP		 2208 if (try)
2209 return 0;
27407a01 2210
baaa35ad
ZJS		 2211 return log_error_errno(SYNTHETIC_ERRNO(EEXIST),
2212 "%s: already a mount point, refusing to use for journal", p);
57fb9fb5
LP		 2213 }
2214
e1873695 2215 if (path_is_mount_point(q, NULL, 0) > 0) {
8054d749
LP		 2216 if (try)
2217 return 0;
57fb9fb5 2218
baaa35ad
ZJS		 2219 return log_error_errno(SYNTHETIC_ERRNO(EEXIST),
2220 "%s: already a mount point, refusing to use for journal", q);
57fb9fb5
LP		 2221 }
2222
2223 r = readlink_and_make_absolute(p, &d);
2224 if (r >= 0) {
3742095b 2225 if (IN_SET(arg_link_journal, LINK_GUEST, LINK_AUTO) &&
57fb9fb5
LP		 2226 path_equal(d, q)) {
2227
03cfe0d5 2228 r = userns_mkdir(directory, p, 0755, 0, 0);
27407a01 2229 if (r < 0)
709f6e46 2230 log_warning_errno(r, "Failed to create directory %s: %m", q);
27407a01 2231 return 0;
57fb9fb5
LP		 2232 }
2233
4a62c710
MS		 2234 if (unlink(p) < 0)
2235 return log_error_errno(errno, "Failed to remove symlink %s: %m", p);
57fb9fb5
LP		 2236 } else if (r == -EINVAL) {
2237
2238 if (arg_link_journal == LINK_GUEST &&
2239 rmdir(p) < 0) {
2240
27407a01
ZJS		 2241 if (errno == ENOTDIR) {
2242 log_error("%s already exists and is neither a symlink nor a directory", p);
2243 return r;
4314d33f
MS		 2244 } else
2245 return log_error_errno(errno, "Failed to remove %s: %m", p);
57fb9fb5 2246 }
4314d33f
MS		 2247 } else if (r != -ENOENT)
2248 return log_error_errno(r, "readlink(%s) failed: %m", p);
57fb9fb5
LP		 2249
2250 if (arg_link_journal == LINK_GUEST) {
2251
2252 if (symlink(q, p) < 0) {
8054d749 2253 if (try) {
56f64d95 2254 log_debug_errno(errno, "Failed to symlink %s to %s, skipping journal setup: %m", q, p);
574edc90 2255 return 0;
4314d33f
MS		 2256 } else
2257 return log_error_errno(errno, "Failed to symlink %s to %s: %m", q, p);
57fb9fb5
LP		 2258 }
2259
03cfe0d5 2260 r = userns_mkdir(directory, p, 0755, 0, 0);
27407a01 2261 if (r < 0)
709f6e46 2262 log_warning_errno(r, "Failed to create directory %s: %m", q);
27407a01 2263 return 0;
57fb9fb5
LP		 2264 }
2265
2266 if (arg_link_journal == LINK_HOST) {
ccddd104 2267 /* don't create parents here — if the host doesn't have
574edc90 2268 * permanent journal set up, don't force it here */
ba8e6c4d 2269
dae8b82e
ZJS		 2270 r = mkdir_errno_wrapper(p, 0755);
2271 if (r < 0 && r != -EEXIST) {
8054d749 2272 if (try) {
dae8b82e 2273 log_debug_errno(r, "Failed to create %s, skipping journal setup: %m", p);
574edc90 2274 return 0;
4314d33f 2275 } else
dae8b82e 2276 return log_error_errno(r, "Failed to create %s: %m", p);
57fb9fb5
LP		 2277 }
2278
27407a01
ZJS		 2279 } else if (access(p, F_OK) < 0)
2280 return 0;
57fb9fb5 2281
cdb2b9d0
LP		 2282 if (dir_is_empty(q) == 0)
2283 log_warning("%s is not empty, proceeding anyway.", q);
2284
03cfe0d5 2285 r = userns_mkdir(directory, p, 0755, 0, 0);
709f6e46
MS		 2286 if (r < 0)
2287 return log_error_errno(r, "Failed to create %s: %m", q);
57fb9fb5 2288
60e76d48
ZJS		 2289 r = mount_verbose(LOG_DEBUG, p, q, NULL, MS_BIND, NULL);
2290 if (r < 0)
4a62c710 2291 return log_error_errno(errno, "Failed to bind mount journal from host into guest: %m");
57fb9fb5 2292
27407a01 2293 return 0;
57fb9fb5
LP		 2294}
2295
de40a303
LP		 2296static int drop_capabilities(uid_t uid) {
2297 CapabilityQuintet q;
2298
2299 /* Let's initialize all five capability sets to something valid. If the quintet was configured via
2300 * OCI use that, but fill in missing bits. If it wasn't then derive the quintet in full from
2301 * arg_caps_retain. */
2302
2303 if (capability_quintet_is_set(&arg_full_capabilities)) {
2304 q = arg_full_capabilities;
2305
2306 if (q.bounding == (uint64_t) -1)
2307 q.bounding = uid == 0 ? arg_caps_retain : 0;
2308
2309 if (q.effective == (uint64_t) -1)
2310 q.effective = uid == 0 ? q.bounding : 0;
2311
2312 if (q.inheritable == (uint64_t) -1)
2313 q.inheritable = uid == 0 ? q.bounding : 0;
2314
2315 if (q.permitted == (uint64_t) -1)
2316 q.permitted = uid == 0 ? q.bounding : 0;
2317
2318 if (q.ambient == (uint64_t) -1 && ambient_capabilities_supported())
2319 q.ambient = 0;
2320 } else
2321 q = (CapabilityQuintet) {
2322 .bounding = arg_caps_retain,
2323 .effective = uid == 0 ? arg_caps_retain : 0,
2324 .inheritable = uid == 0 ? arg_caps_retain : 0,
2325 .permitted = uid == 0 ? arg_caps_retain : 0,
2326 .ambient = ambient_capabilities_supported() ? 0 : (uint64_t) -1,
2327 };
2328
2329 return capability_quintet_enforce(&q);
88213476
LP		 2330}
2331
db999e0f
LP		 2332static int reset_audit_loginuid(void) {
2333 _cleanup_free_ char *p = NULL;
2334 int r;
2335
0c582db0 2336 if ((arg_clone_ns_flags & CLONE_NEWPID) == 0)
db999e0f
LP		 2337 return 0;
2338
2339 r = read_one_line_file("/proc/self/loginuid", &p);
13e8ceb8 2340 if (r == -ENOENT)
db999e0f 2341 return 0;
f647962d
MS		 2342 if (r < 0)
2343 return log_error_errno(r, "Failed to read /proc/self/loginuid: %m");
db999e0f
LP		 2344
2345 /* Already reset? */
2346 if (streq(p, "4294967295"))
2347 return 0;
2348
57512c89 2349 r = write_string_file("/proc/self/loginuid", "4294967295", WRITE_STRING_FILE_DISABLE_BUFFER);
db999e0f 2350 if (r < 0) {
10a87006
LP		 2351 log_error_errno(r,
2352 "Failed to reset audit login UID. This probably means that your kernel is too\n"
2353 "old and you have audit enabled. Note that the auditing subsystem is known to\n"
2354 "be incompatible with containers on old kernels. Please make sure to upgrade\n"
2355 "your kernel or to off auditing with 'audit=0' on the kernel command line before\n"
2356 "using systemd-nspawn. Sleeping for 5s... (%m)");
77b6e194 2357
db999e0f 2358 sleep(5);
77b6e194 2359 }
db999e0f
LP		 2360
2361 return 0;
77b6e194
LP		 2362}
2363
785890ac
LP		 2364static int setup_propagate(const char *root) {
2365 const char *p, *q;
709f6e46 2366 int r;
785890ac
LP		 2367
2368 (void) mkdir_p("/run/systemd/nspawn/", 0755);
2369 (void) mkdir_p("/run/systemd/nspawn/propagate", 0600);
63c372cb 2370 p = strjoina("/run/systemd/nspawn/propagate/", arg_machine);
785890ac
LP		 2371 (void) mkdir_p(p, 0600);
2372
709f6e46
MS		 2373 r = userns_mkdir(root, "/run/systemd", 0755, 0, 0);
2374 if (r < 0)
2375 return log_error_errno(r, "Failed to create /run/systemd: %m");
03cfe0d5 2376
709f6e46
MS		 2377 r = userns_mkdir(root, "/run/systemd/nspawn", 0755, 0, 0);
2378 if (r < 0)
2379 return log_error_errno(r, "Failed to create /run/systemd/nspawn: %m");
03cfe0d5 2380
709f6e46
MS		 2381 r = userns_mkdir(root, "/run/systemd/nspawn/incoming", 0600, 0, 0);
2382 if (r < 0)
2383 return log_error_errno(r, "Failed to create /run/systemd/nspawn/incoming: %m");
785890ac 2384
03cfe0d5 2385 q = prefix_roota(root, "/run/systemd/nspawn/incoming");
60e76d48
ZJS		 2386 r = mount_verbose(LOG_ERR, p, q, NULL, MS_BIND, NULL);
2387 if (r < 0)
2388 return r;
785890ac 2389
60e76d48
ZJS		 2390 r = mount_verbose(LOG_ERR, NULL, q, NULL, MS_BIND|MS_REMOUNT|MS_RDONLY, NULL);
2391 if (r < 0)
2392 return r;
785890ac 2393
19caffac
AC		 2394 /* machined will MS_MOVE into that directory, and that's only
2395 * supported for non-shared mounts. */
60e76d48 2396 return mount_verbose(LOG_ERR, NULL, q, NULL, MS_SLAVE, NULL);
785890ac
LP		 2397}
2398
317feb4d 2399static int setup_machine_id(const char *directory) {
691675ba
LP		 2400 const char *etc_machine_id;
2401 sd_id128_t id;
3bbaff3e 2402 int r;
e01ff70a 2403
317feb4d
LP		 2404 /* If the UUID in the container is already set, then that's what counts, and we use. If it isn't set, and the
2405 * caller passed --uuid=, then we'll pass it in the $container_uuid env var to PID 1 of the container. The
2406 * assumption is that PID 1 will then write it to /etc/machine-id to make it persistent. If --uuid= is not
2407 * passed we generate a random UUID, and pass it via $container_uuid. In effect this means that /etc/machine-id
2408 * in the container and our idea of the container UUID will always be in sync (at least if PID 1 in the
2409 * container behaves nicely). */
2410
e01ff70a
MS		 2411 etc_machine_id = prefix_roota(directory, "/etc/machine-id");
2412
691675ba 2413 r = id128_read(etc_machine_id, ID128_PLAIN, &id);
317feb4d
LP		 2414 if (r < 0) {
2415 if (!IN_SET(r, -ENOENT, -ENOMEDIUM)) /* If the file is missing or empty, we don't mind */
2416 return log_error_errno(r, "Failed to read machine ID from container image: %m");
691675ba 2417
317feb4d
LP		 2418 if (sd_id128_is_null(arg_uuid)) {
2419 r = sd_id128_randomize(&arg_uuid);
2420 if (r < 0)
2421 return log_error_errno(r, "Failed to acquire randomized machine UUID: %m");
2422 }
2423 } else {
baaa35ad
ZJS		 2424 if (sd_id128_is_null(id))
2425 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
2426 "Machine ID in container image is zero, refusing.");
e01ff70a 2427
317feb4d
LP		 2428 arg_uuid = id;
2429 }
691675ba 2430
e01ff70a
MS		 2431 return 0;
2432}
2433
7336138e
LP		 2434static int recursive_chown(const char *directory, uid_t shift, uid_t range) {
2435 int r;
2436
2437 assert(directory);
2438
0de7acce 2439 if (arg_userns_mode == USER_NAMESPACE_NO || !arg_userns_chown)
7336138e
LP		 2440 return 0;
2441
2442 r = path_patch_uid(directory, arg_uid_shift, arg_uid_range);
2443 if (r == -EOPNOTSUPP)
2444 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.");
2445 if (r == -EBADE)
2446 return log_error_errno(r, "Upper 16 bits of root directory UID and GID do not match.");
2447 if (r < 0)
2448 return log_error_errno(r, "Failed to adjust UID/GID shift of OS tree: %m");
2449 if (r == 0)
2450 log_debug("Root directory of image is already owned by the right UID/GID range, skipping recursive chown operation.");
2451 else
2452 log_debug("Patched directory tree to match UID/GID range.");
2453
2454 return r;
2455}
2456
113cea80 2457/*
6d416b9c
LS		 2458 * Return values:
2459 * < 0 : wait_for_terminate() failed to get the state of the
2460 * container, the container was terminated by a signal, or
2461 * failed for an unknown reason. No change is made to the
2462 * container argument.
2463 * > 0 : The program executed in the container terminated with an
2464 * error. The exit code of the program executed in the
919699ec
LP		 2465 * container is returned. The container argument has been set
2466 * to CONTAINER_TERMINATED.
6d416b9c
LS		 2467 * 0 : The container is being rebooted, has been shut down or exited
2468 * successfully. The container argument has been set to either
2469 * CONTAINER_TERMINATED or CONTAINER_REBOOTED.
113cea80 2470 *
6d416b9c
LS		 2471 * That is, success is indicated by a return value of zero, and an
2472 * error is indicated by a non-zero value.
113cea80
DH		 2473 */
2474static int wait_for_container(pid_t pid, ContainerStatus *container) {
113cea80 2475 siginfo_t status;
919699ec 2476 int r;
113cea80
DH		 2477
2478 r = wait_for_terminate(pid, &status);
f647962d
MS		 2479 if (r < 0)
2480 return log_warning_errno(r, "Failed to wait for container: %m");
113cea80
DH		 2481
2482 switch (status.si_code) {
fddbb89c 2483
113cea80 2484 case CLD_EXITED:
b5a2179b 2485 if (status.si_status == 0)
919699ec 2486 log_full(arg_quiet ? LOG_DEBUG : LOG_INFO, "Container %s exited successfully.", arg_machine);
b5a2179b 2487 else
919699ec 2488 log_full(arg_quiet ? LOG_DEBUG : LOG_INFO, "Container %s failed with error code %i.", arg_machine, status.si_status);
fddbb89c 2489
919699ec
LP		 2490 *container = CONTAINER_TERMINATED;
2491 return status.si_status;
113cea80
DH		 2492
2493 case CLD_KILLED:
2494 if (status.si_status == SIGINT) {
919699ec 2495 log_full(arg_quiet ? LOG_DEBUG : LOG_INFO, "Container %s has been shut down.", arg_machine);
113cea80 2496 *container = CONTAINER_TERMINATED;
919699ec
LP		 2497 return 0;
2498
113cea80 2499 } else if (status.si_status == SIGHUP) {
919699ec 2500 log_full(arg_quiet ? LOG_DEBUG : LOG_INFO, "Container %s is being rebooted.", arg_machine);
113cea80 2501 *container = CONTAINER_REBOOTED;
919699ec 2502 return 0;
113cea80 2503 }
919699ec 2504
4831981d 2505 _fallthrough_;
113cea80 2506 case CLD_DUMPED:
baaa35ad
ZJS		 2507 return log_error_errno(SYNTHETIC_ERRNO(EIO),
2508 "Container %s terminated by signal %s.", arg_machine, signal_to_string(status.si_status));
113cea80
DH		 2509
2510 default:
baaa35ad
ZJS		 2511 return log_error_errno(SYNTHETIC_ERRNO(EIO),
2512 "Container %s failed due to unknown reason.", arg_machine);
113cea80 2513 }
113cea80
DH		 2514}
2515
023fb90b
LP		 2516static int on_orderly_shutdown(sd_event_source *s, const struct signalfd_siginfo *si, void *userdata) {
2517 pid_t pid;
2518
4a0b58c4 2519 pid = PTR_TO_PID(userdata);
023fb90b 2520 if (pid > 0) {
c6c8f6e2 2521 if (kill(pid, arg_kill_signal) >= 0) {
023fb90b
LP		 2522 log_info("Trying to halt container. Send SIGTERM again to trigger immediate termination.");
2523 sd_event_source_set_userdata(s, NULL);
2524 return 0;
2525 }
2526 }
2527
2528 sd_event_exit(sd_event_source_get_event(s), 0);
2529 return 0;
2530}
2531
6916b164 2532static int on_sigchld(sd_event_source *s, const struct signalfd_siginfo *ssi, void *userdata) {
abdb9b08
LP		 2533 pid_t pid;
2534
2535 assert(s);
2536 assert(ssi);
2537
2538 pid = PTR_TO_PID(userdata);
2539
6916b164
AU		 2540 for (;;) {
2541 siginfo_t si = {};
abdb9b08 2542
6916b164
AU		 2543 if (waitid(P_ALL, 0, &si, WNOHANG|WNOWAIT|WEXITED) < 0)
2544 return log_error_errno(errno, "Failed to waitid(): %m");
2545 if (si.si_pid == 0) /* No pending children. */
2546 break;
abdb9b08 2547 if (si.si_pid == pid) {
6916b164
AU		 2548 /* The main process we care for has exited. Return from
2549 * signal handler but leave the zombie. */
2550 sd_event_exit(sd_event_source_get_event(s), 0);
2551 break;
2552 }
abdb9b08 2553
6916b164
AU		 2554 /* Reap all other children. */
2555 (void) waitid(P_PID, si.si_pid, &si, WNOHANG|WEXITED);
2556 }
2557
2558 return 0;
2559}
2560
abdb9b08
LP		 2561static int on_request_stop(sd_bus_message *m, void *userdata, sd_bus_error *error) {
2562 pid_t pid;
2563
2564 assert(m);
2565
2566 pid = PTR_TO_PID(userdata);
2567
2568 if (arg_kill_signal > 0) {
2569 log_info("Container termination requested. Attempting to halt container.");
2570 (void) kill(pid, arg_kill_signal);
2571 } else {
2572 log_info("Container termination requested. Exiting.");
2573 sd_event_exit(sd_bus_get_event(sd_bus_message_get_bus(m)), 0);
2574 }
2575
2576 return 0;
2577}
2578
ec16945e 2579static int determine_names(void) {
1b9cebf6 2580 int r;
ec16945e 2581
c1521918
LP		 2582 if (arg_template && !arg_directory && arg_machine) {
2583
2584 /* If --template= was specified then we should not
2585 * search for a machine, but instead create a new one
2586 * in /var/lib/machine. */
2587
605405c6 2588 arg_directory = strjoin("/var/lib/machines/", arg_machine);
c1521918
LP		 2589 if (!arg_directory)
2590 return log_oom();
2591 }
2592
ec16945e 2593 if (!arg_image && !arg_directory) {
1b9cebf6
LP		 2594 if (arg_machine) {
2595 _cleanup_(image_unrefp) Image *i = NULL;
2596
5ef46e5f 2597 r = image_find(IMAGE_MACHINE, arg_machine, &i);
3a6ce860
LP		 2598 if (r == -ENOENT)
2599 return log_error_errno(r, "No image for machine '%s'.", arg_machine);
1b9cebf6
LP		 2600 if (r < 0)
2601 return log_error_errno(r, "Failed to find image for machine '%s': %m", arg_machine);
1b9cebf6 2602
eb38edce 2603 if (IN_SET(i->type, IMAGE_RAW, IMAGE_BLOCK))
0f03c2a4 2604 r = free_and_strdup(&arg_image, i->path);
1b9cebf6 2605 else
0f03c2a4 2606 r = free_and_strdup(&arg_directory, i->path);
1b9cebf6 2607 if (r < 0)
0f3be6ca 2608 return log_oom();
1b9cebf6 2609
aee327b8
LP		 2610 if (!arg_ephemeral)
2611 arg_read_only = arg_read_only || i->read_only;
d7249575
LP		 2612 } else {
2613 r = safe_getcwd(&arg_directory);
2614 if (r < 0)
2615 return log_error_errno(r, "Failed to determine current directory: %m");
2616 }
ec16945e 2617
c6147113
LP		 2618 if (!arg_directory && !arg_image)
2619 return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "Failed to determine path, please use -D or -i.");
ec16945e
LP		 2620 }
2621
2622 if (!arg_machine) {
b9ba4dab
LP		 2623 if (arg_directory && path_equal(arg_directory, "/"))
2624 arg_machine = gethostname_malloc();
4827ab48
LP		 2625 else {
2626 if (arg_image) {
2627 char *e;
2628
2629 arg_machine = strdup(basename(arg_image));
2630
2631 /* Truncate suffix if there is one */
2632 e = endswith(arg_machine, ".raw");
2633 if (e)
2634 *e = 0;
2635 } else
2636 arg_machine = strdup(basename(arg_directory));
2637 }
ec16945e
LP		 2638 if (!arg_machine)
2639 return log_oom();
2640
ae691c1d 2641 hostname_cleanup(arg_machine);
c6147113
LP		 2642 if (!machine_name_is_valid(arg_machine))
2643 return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "Failed to determine machine name automatically, please use -M.");
b9ba4dab
LP		 2644
2645 if (arg_ephemeral) {
2646 char *b;
2647
2648 /* Add a random suffix when this is an
2649 * ephemeral machine, so that we can run many
2650 * instances at once without manually having
2651 * to specify -M each time. */
2652
2653 if (asprintf(&b, "%s-%016" PRIx64, arg_machine, random_u64()) < 0)
2654 return log_oom();
2655
2656 free(arg_machine);
2657 arg_machine = b;
2658 }
ec16945e
LP		 2659 }
2660
2661 return 0;
2662}
2663
8d4aa2bb 2664static int chase_symlinks_and_update(char **p, unsigned flags) {
3f342ec4
LP		 2665 char *chased;
2666 int r;
2667
2668 assert(p);
2669
2670 if (!*p)
2671 return 0;
2672
8d4aa2bb 2673 r = chase_symlinks(*p, NULL, flags, &chased);
3f342ec4
LP		 2674 if (r < 0)
2675 return log_error_errno(r, "Failed to resolve path %s: %m", *p);
2676
8405dcf7
ZJS		 2677 free_and_replace(*p, chased);
2678 return r; /* r might be an fd here in case we ever use CHASE_OPEN in flags */
3f342ec4
LP		 2679}
2680
03cfe0d5 2681static int determine_uid_shift(const char *directory) {
6dac160c
LP		 2682 int r;
2683
0de7acce 2684 if (arg_userns_mode == USER_NAMESPACE_NO) {
03cfe0d5 2685 arg_uid_shift = 0;
6dac160c 2686 return 0;
03cfe0d5 2687 }
6dac160c
LP		 2688
2689 if (arg_uid_shift == UID_INVALID) {
2690 struct stat st;
2691
03cfe0d5 2692 r = stat(directory, &st);
6dac160c 2693 if (r < 0)
03cfe0d5 2694 return log_error_errno(errno, "Failed to determine UID base of %s: %m", directory);
6dac160c
LP		 2695
2696 arg_uid_shift = st.st_uid & UINT32_C(0xffff0000);
2697
baaa35ad
ZJS		 2698 if (arg_uid_shift != (st.st_gid & UINT32_C(0xffff0000)))
2699 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
2700 "UID and GID base of %s don't match.", directory);
6dac160c
LP		 2701
2702 arg_uid_range = UINT32_C(0x10000);
2703 }
2704
baaa35ad
ZJS		 2705 if (arg_uid_shift > (uid_t) -1 - arg_uid_range)
2706 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
2707 "UID base too high for UID range.");
6dac160c 2708
6dac160c
LP		 2709 return 0;
2710}
2711
de40a303
LP		 2712static unsigned long effective_clone_ns_flags(void) {
2713 unsigned long flags = arg_clone_ns_flags;
2714
2715 if (arg_private_network)
2716 flags |= CLONE_NEWNET;
2717 if (arg_use_cgns)
2718 flags |= CLONE_NEWCGROUP;
2719 if (arg_userns_mode != USER_NAMESPACE_NO)
2720 flags |= CLONE_NEWUSER;
2721
2722 return flags;
2723}
2724
2725static int patch_sysctl(void) {
2726
2727 /* This table is inspired by runc's sysctl() function */
2728 static const struct {
2729 const char *key;
2730 bool prefix;
2731 unsigned long clone_flags;
2732 } safe_sysctl[] = {
2733 { "kernel.hostname", false, CLONE_NEWUTS },
2734 { "kernel.domainname", false, CLONE_NEWUTS },
2735 { "kernel.msgmax", false, CLONE_NEWIPC },
2736 { "kernel.msgmnb", false, CLONE_NEWIPC },
2737 { "kernel.msgmni", false, CLONE_NEWIPC },
2738 { "kernel.sem", false, CLONE_NEWIPC },
2739 { "kernel.shmall", false, CLONE_NEWIPC },
2740 { "kernel.shmmax", false, CLONE_NEWIPC },
2741 { "kernel.shmmni", false, CLONE_NEWIPC },
2742 { "fs.mqueue.", true, CLONE_NEWIPC },
2743 { "net.", true, CLONE_NEWNET },
2744 };
2745
2746 unsigned long flags;
2747 char **k, **v;
2748 int r;
2749
2750 flags = effective_clone_ns_flags();
2751
2752 STRV_FOREACH_PAIR(k, v, arg_sysctl) {
2753 bool good = false;
2754 size_t i;
2755
2756 for (i = 0; i < ELEMENTSOF(safe_sysctl); i++) {
2757
2758 if (!FLAGS_SET(flags, safe_sysctl[i].clone_flags))
2759 continue;
2760
2761 if (safe_sysctl[i].prefix)
2762 good = startswith(*k, safe_sysctl[i].key);
2763 else
2764 good = streq(*k, safe_sysctl[i].key);
2765
2766 if (good)
2767 break;
2768 }
2769
c6147113
LP		 2770 if (!good)
2771 return log_error_errno(SYNTHETIC_ERRNO(EPERM), "Refusing to write to sysctl '%s', as it is not safe in the selected namespaces.", *k);
de40a303
LP		 2772
2773 r = sysctl_write(*k, *v);
2774 if (r < 0)
2775 return log_error_errno(r, "Failed to write sysctl '%s': %m", *k);
2776 }
2777
2778 return 0;
2779}
2780
03cfe0d5
LP		 2781static int inner_child(
2782 Barrier *barrier,
2783 const char *directory,
2784 bool secondary,
2785 int kmsg_socket,
2786 int rtnl_socket,
3acc84eb 2787 int master_pty_socket,
f757855e 2788 FDSet *fds) {
69c79d3c 2789
3acc84eb 2790 _cleanup_close_ int master = -1;
03cfe0d5 2791 _cleanup_free_ char *home = NULL;
e01ff70a 2792 char as_uuid[37];
88614c8a 2793 size_t n_env = 1;
03cfe0d5 2794 const char *envp[] = {
0c300adf 2795 "PATH=" DEFAULT_PATH_COMPAT,
6aadfa4c 2796 NULL, /* container */
03cfe0d5
LP		 2797 NULL, /* TERM */
2798 NULL, /* HOME */
2799 NULL, /* USER */
2800 NULL, /* LOGNAME */
2801 NULL, /* container_uuid */
2802 NULL, /* LISTEN_FDS */
2803 NULL, /* LISTEN_PID */
9c1e04d0 2804 NULL, /* NOTIFY_SOCKET */
03cfe0d5
LP		 2805 NULL
2806 };
1a68e1e5 2807 const char *exec_target;
2371271c 2808 _cleanup_strv_free_ char **env_use = NULL;
de40a303 2809 int r, which_failed;
88213476 2810
b37469d7
LP		 2811 /* This is the "inner" child process, i.e. the one forked off by the "outer" child process, which is the one
2812 * the container manager itself forked off. At the time of clone() it gained its own CLONE_NEWNS, CLONE_NEWPID,
2813 * CLONE_NEWUTS, CLONE_NEWIPC, CLONE_NEWUSER namespaces. Note that it has its own CLONE_NEWNS namespace,
2814 * separate from the CLONE_NEWNS created for the "outer" child, and also separate from the host's CLONE_NEWNS
2815 * namespace. The reason for having two levels of CLONE_NEWNS namespaces is that the "inner" one is owned by
2816 * the CLONE_NEWUSER namespace of the container, while the "outer" one is owned by the host's CLONE_NEWUSER
2817 * namespace.
2818 *
2819 * Note at this point we have no CLONE_NEWNET namespace yet. We'll acquire that one later through
2820 * unshare(). See below. */
2821
03cfe0d5
LP		 2822 assert(barrier);
2823 assert(directory);
2824 assert(kmsg_socket >= 0);
88213476 2825
de40a303
LP		 2826 log_debug("Inner child is initializing.");
2827
0de7acce 2828 if (arg_userns_mode != USER_NAMESPACE_NO) {
03cfe0d5
LP		 2829 /* Tell the parent, that it now can write the UID map. */
2830 (void) barrier_place(barrier); /* #1 */
7027ff61 2831
03cfe0d5 2832 /* Wait until the parent wrote the UID map */
baaa35ad
ZJS		 2833 if (!barrier_place_and_sync(barrier)) /* #2 */
2834 return log_error_errno(SYNTHETIC_ERRNO(ESRCH),
2835 "Parent died too early");
88213476
LP		 2836 }
2837
6d66bd3b
EV		 2838 r = reset_uid_gid();
2839 if (r < 0)
2840 return log_error_errno(r, "Couldn't become new root: %m");
2841
0de7acce 2842 r = mount_all(NULL,
4f086aab 2843 arg_mount_settings | MOUNT_IN_USERNS,
0de7acce 2844 arg_uid_shift,
0de7acce 2845 arg_selinux_apifs_context);
03cfe0d5
LP		 2846 if (r < 0)
2847 return r;
2848
04413780
ZJS		 2849 if (!arg_network_namespace_path && arg_private_network) {
2850 r = unshare(CLONE_NEWNET);
2851 if (r < 0)
2852 return log_error_errno(errno, "Failed to unshare network namespace: %m");
75116558
PS		 2853
2854 /* Tell the parent that it can setup network interfaces. */
2855 (void) barrier_place(barrier); /* #3 */
04413780
ZJS		 2856 }
2857
4f086aab 2858 r = mount_sysfs(NULL, arg_mount_settings);
d8fc6a00
LP		 2859 if (r < 0)
2860 return r;
2861
03cfe0d5
LP		 2862 /* Wait until we are cgroup-ified, so that we
2863 * can mount the right cgroup path writable */
baaa35ad
ZJS		 2864 if (!barrier_place_and_sync(barrier)) /* #4 */
2865 return log_error_errno(SYNTHETIC_ERRNO(ESRCH),
2866 "Parent died too early");
88213476 2867
489fae52 2868 if (arg_use_cgns) {
0996ef00
CB		 2869 r = unshare(CLONE_NEWCGROUP);
2870 if (r < 0)
04413780 2871 return log_error_errno(errno, "Failed to unshare cgroup namespace: %m");
0996ef00
CB		 2872 r = mount_cgroups(
2873 "",
2874 arg_unified_cgroup_hierarchy,
2875 arg_userns_mode != USER_NAMESPACE_NO,
2876 arg_uid_shift,
2877 arg_uid_range,
5a8ff0e6 2878 arg_selinux_apifs_context,
ada54120 2879 true);
0996ef00
CB		 2880 if (r < 0)
2881 return r;
2882 } else {
2883 r = mount_systemd_cgroup_writable("", arg_unified_cgroup_hierarchy);
2884 if (r < 0)
2885 return r;
2886 }
ec16945e 2887
1e4f1671 2888 r = setup_boot_id();
03cfe0d5
LP		 2889 if (r < 0)
2890 return r;
ec16945e 2891
1e4f1671 2892 r = setup_kmsg(kmsg_socket);
03cfe0d5
LP		 2893 if (r < 0)
2894 return r;
2895 kmsg_socket = safe_close(kmsg_socket);
ec16945e 2896
de40a303
LP		 2897 r = mount_custom(
2898 "/",
2899 arg_custom_mounts,
2900 arg_n_custom_mounts,
2901 false,
2902 0,
2903 0,
2904 arg_selinux_apifs_context,
2905 true);
2906 if (r < 0)
2907 return r;
2908
03cfe0d5
LP		 2909 if (setsid() < 0)
2910 return log_error_errno(errno, "setsid() failed: %m");
2911
2912 if (arg_private_network)
2913 loopback_setup();
2914
7a8f6325
LP		 2915 if (arg_expose_ports) {
2916 r = expose_port_send_rtnl(rtnl_socket);
2917 if (r < 0)
2918 return r;
2919 rtnl_socket = safe_close(rtnl_socket);
2920 }
03cfe0d5 2921
3acc84eb
FB		 2922 if (arg_console_mode != CONSOLE_PIPE) {
2923 _cleanup_free_ char *console = NULL;
2924
2925 /* Allocate a pty and make it available as /dev/console. */
dc98caea 2926 master = openpt_allocate(O_RDWR|O_NONBLOCK, &console);
3acc84eb 2927 if (master < 0)
dc98caea 2928 return log_error_errno(master, "Failed to allocate a pty: %m");
3acc84eb
FB		 2929
2930 r = setup_dev_console(console);
2931 if (r < 0)
2932 return log_error_errno(r, "Failed to setup /dev/console: %m");
2933
2934 r = send_one_fd(master_pty_socket, master, 0);
2935 if (r < 0)
2936 return log_error_errno(r, "Failed to send master fd: %m");
2937 master_pty_socket = safe_close(master_pty_socket);
2938
2939 r = setup_stdio_as_dev_console();
2940 if (r < 0)
2941 return r;
2942 }
2943
de40a303
LP		 2944 r = patch_sysctl();
2945 if (r < 0)
2946 return r;
2947
81f345df
LP		 2948 if (arg_oom_score_adjust_set) {
2949 r = set_oom_score_adjust(arg_oom_score_adjust);
2950 if (r < 0)
2951 return log_error_errno(r, "Failed to adjust OOM score: %m");
2952 }
2953
0985c7c4
ZJS		 2954 if (arg_cpu_set.set)
2955 if (sched_setaffinity(0, arg_cpu_set.allocated, arg_cpu_set.set) < 0)
d107bb7d
LP		 2956 return log_error_errno(errno, "Failed to set CPU affinity: %m");
2957
c818eef1 2958 (void) setup_hostname();
03cfe0d5 2959
050f7277 2960 if (arg_personality != PERSONALITY_INVALID) {
21022b9d
LP		 2961 r = safe_personality(arg_personality);
2962 if (r < 0)
2963 return log_error_errno(r, "personality() failed: %m");
03cfe0d5 2964 } else if (secondary) {
21022b9d
LP		 2965 r = safe_personality(PER_LINUX32);
2966 if (r < 0)
2967 return log_error_errno(r, "personality() failed: %m");
03cfe0d5
LP		 2968 }
2969
de40a303
LP		 2970 r = setrlimit_closest_all((const struct rlimit *const*) arg_rlimit, &which_failed);
2971 if (r < 0)
2972 return log_error_errno(r, "Failed to apply resource limit RLIMIT_%s: %m", rlimit_to_string(which_failed));
2973
2974#if HAVE_SECCOMP
2975 if (arg_seccomp) {
2976
2977 if (is_seccomp_available()) {
2978
2979 r = seccomp_load(arg_seccomp);
7bc5e0b1 2980 if (ERRNO_IS_SECCOMP_FATAL(r))
de40a303
LP		 2981 return log_error_errno(r, "Failed to install seccomp filter: %m");
2982 if (r < 0)
2983 log_debug_errno(r, "Failed to install seccomp filter: %m");
2984 }
2985 } else
2986#endif
2987 {
2988 r = setup_seccomp(arg_caps_retain, arg_syscall_whitelist, arg_syscall_blacklist);
2989 if (r < 0)
2990 return r;
2991 }
2992
349cc4a5 2993#if HAVE_SELINUX
03cfe0d5 2994 if (arg_selinux_context)
2ed96880 2995 if (setexeccon(arg_selinux_context) < 0)
03cfe0d5
LP		 2996 return log_error_errno(errno, "setexeccon(\"%s\") failed: %m", arg_selinux_context);
2997#endif
2998
de40a303
LP		 2999 /* Make sure we keep the caps across the uid/gid dropping, so that we can retain some selected caps
3000 * if we need to later on. */
3001 if (prctl(PR_SET_KEEPCAPS, 1) < 0)
3002 return log_error_errno(errno, "Failed to set PR_SET_KEEPCAPS: %m");
3003
3004 if (uid_is_valid(arg_uid) || gid_is_valid(arg_gid))
3005 r = change_uid_gid_raw(arg_uid, arg_gid, arg_supplementary_gids, arg_n_supplementary_gids);
3006 else
3007 r = change_uid_gid(arg_user, &home);
03cfe0d5
LP		 3008 if (r < 0)
3009 return r;
3010
de40a303
LP		 3011 r = drop_capabilities(getuid());
3012 if (r < 0)
3013 return log_error_errno(r, "Dropping capabilities failed: %m");
3014
66edd963
LP		 3015 if (arg_no_new_privileges)
3016 if (prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0) < 0)
3017 return log_error_errno(errno, "Failed to disable new privileges: %m");
3018
6aadfa4c
ILG		 3019 /* LXC sets container=lxc, so follow the scheme here */
3020 envp[n_env++] = strjoina("container=", arg_container_service_name);
3021
03cfe0d5
LP		 3022 envp[n_env] = strv_find_prefix(environ, "TERM=");
3023 if (envp[n_env])
313cefa1 3024 n_env++;
03cfe0d5 3025
de40a303
LP		 3026 if (home || !uid_is_valid(arg_uid) || arg_uid == 0)
3027 if (asprintf((char**)(envp + n_env++), "HOME=%s", home ?: "/root") < 0)
3028 return log_oom();
3029
3030 if (arg_user || !uid_is_valid(arg_uid) || arg_uid == 0)
3031 if (asprintf((char**)(envp + n_env++), "USER=%s", arg_user ?: "root") < 0 ||
3032 asprintf((char**)(envp + n_env++), "LOGNAME=%s", arg_user ? arg_user : "root") < 0)
3033 return log_oom();
03cfe0d5 3034
3bbaff3e 3035 assert(!sd_id128_is_null(arg_uuid));
03cfe0d5 3036
691675ba 3037 if (asprintf((char**)(envp + n_env++), "container_uuid=%s", id128_to_uuid_string(arg_uuid, as_uuid)) < 0)
e01ff70a 3038 return log_oom();
03cfe0d5
LP		 3039
3040 if (fdset_size(fds) > 0) {
3041 r = fdset_cloexec(fds, false);
3042 if (r < 0)
3043 return log_error_errno(r, "Failed to unset O_CLOEXEC for file descriptors.");
3044
3045 if ((asprintf((char **)(envp + n_env++), "LISTEN_FDS=%u", fdset_size(fds)) < 0) ||
3046 (asprintf((char **)(envp + n_env++), "LISTEN_PID=1") < 0))
3047 return log_oom();
3048 }
9c1e04d0
AP		 3049 if (asprintf((char **)(envp + n_env++), "NOTIFY_SOCKET=%s", NSPAWN_NOTIFY_SOCKET_PATH) < 0)
3050 return log_oom();
03cfe0d5 3051
2371271c
TG		 3052 env_use = strv_env_merge(2, envp, arg_setenv);
3053 if (!env_use)
3054 return log_oom();
03cfe0d5
LP		 3055
3056 /* Let the parent know that we are ready and
3057 * wait until the parent is ready with the
3058 * setup, too... */
baaa35ad
ZJS		 3059 if (!barrier_place_and_sync(barrier)) /* #5 */
3060 return log_error_errno(SYNTHETIC_ERRNO(ESRCH),
3061 "Parent died too early");
03cfe0d5 3062
5f932eb9
LP		 3063 if (arg_chdir)
3064 if (chdir(arg_chdir) < 0)
3065 return log_error_errno(errno, "Failed to change to specified working directory %s: %m", arg_chdir);
3066
7732f92b 3067 if (arg_start_mode == START_PID2) {
75bf701f 3068 r = stub_pid1(arg_uuid);
7732f92b
LP		 3069 if (r < 0)
3070 return r;
3071 }
3072
de40a303
LP		 3073 log_debug("Inner child completed, invoking payload.");
3074
8ca082b4
LP		 3075 /* Now, explicitly close the log, so that we then can close all remaining fds. Closing the log explicitly first
3076 * has the benefit that the logging subsystem knows about it, and is thus ready to be reopened should we need
3077 * it again. Note that the other fds closed here are at least the locking and barrier fds. */
03cfe0d5 3078 log_close();
8ca082b4
LP		 3079 log_set_open_when_needed(true);
3080
03cfe0d5
LP		 3081 (void) fdset_close_others(fds);
3082
7732f92b 3083 if (arg_start_mode == START_BOOT) {
03cfe0d5
LP		 3084 char **a;
3085 size_t m;
3086
3087 /* Automatically search for the init system */
3088
75f32f04
ZJS		 3089 m = strv_length(arg_parameters);
3090 a = newa(char*, m + 2);
3091 memcpy_safe(a + 1, arg_parameters, m * sizeof(char*));
3092 a[1 + m] = NULL;
03cfe0d5 3093
ced58da7 3094 a[0] = (char*) "/usr/lib/systemd/systemd";
03cfe0d5
LP		 3095 execve(a[0], a, env_use);
3096
ced58da7 3097 a[0] = (char*) "/lib/systemd/systemd";
03cfe0d5
LP		 3098 execve(a[0], a, env_use);
3099
ced58da7 3100 a[0] = (char*) "/sbin/init";
03cfe0d5 3101 execve(a[0], a, env_use);
ced58da7
LP		 3102
3103 exec_target = "/usr/lib/systemd/systemd, /lib/systemd/systemd, /sbin/init";
1a68e1e5 3104 } else if (!strv_isempty(arg_parameters)) {
b6b180b7
LP		 3105 const char *dollar_path;
3106
1a68e1e5 3107 exec_target = arg_parameters[0];
b6b180b7
LP		 3108
3109 /* Use the user supplied search $PATH if there is one, or DEFAULT_PATH_COMPAT if not to search the
3110 * binary. */
3111 dollar_path = strv_env_get(env_use, "PATH");
3112 if (dollar_path) {
3113 if (putenv((char*) dollar_path) != 0)
3114 return log_error_errno(errno, "Failed to update $PATH: %m");
3115 }
3116
f757855e 3117 execvpe(arg_parameters[0], arg_parameters, env_use);
1a68e1e5 3118 } else {
5f932eb9 3119 if (!arg_chdir)
d929b0f9
ZJS		 3120 /* If we cannot change the directory, we'll end up in /, that is expected. */
3121 (void) chdir(home ?: "/root");
5f932eb9 3122
03cfe0d5
LP		 3123 execle("/bin/bash", "-bash", NULL, env_use);
3124 execle("/bin/sh", "-sh", NULL, env_use);
ced58da7
LP		 3125
3126 exec_target = "/bin/bash, /bin/sh";
03cfe0d5
LP		 3127 }
3128
8ca082b4 3129 return log_error_errno(errno, "execv(%s) failed: %m", exec_target);
03cfe0d5
LP		 3130}
3131
9c1e04d0 3132static int setup_sd_notify_child(void) {
271f518f 3133 _cleanup_close_ int fd = -1;
9c1e04d0 3134 union sockaddr_union sa = {
44ed5214
LP		 3135 .un.sun_family = AF_UNIX,
3136 .un.sun_path = NSPAWN_NOTIFY_SOCKET_PATH,
9c1e04d0
AP		 3137 };
3138 int r;
3139
3140 fd = socket(AF_UNIX, SOCK_DGRAM|SOCK_CLOEXEC|SOCK_NONBLOCK, 0);
3141 if (fd < 0)
3142 return log_error_errno(errno, "Failed to allocate notification socket: %m");
3143
3144 (void) mkdir_parents(NSPAWN_NOTIFY_SOCKET_PATH, 0755);
fbda85b0 3145 (void) sockaddr_un_unlink(&sa.un);
9c1e04d0 3146
9c1e04d0 3147 r = bind(fd, &sa.sa, SOCKADDR_UN_LEN(sa.un));
271f518f 3148 if (r < 0)
44ed5214 3149 return log_error_errno(errno, "bind(" NSPAWN_NOTIFY_SOCKET_PATH ") failed: %m");
9c1e04d0 3150
adc7d9f0 3151 r = userns_lchown(NSPAWN_NOTIFY_SOCKET_PATH, 0, 0);
271f518f 3152 if (r < 0)
adc7d9f0 3153 return log_error_errno(r, "Failed to chown " NSPAWN_NOTIFY_SOCKET_PATH ": %m");
adc7d9f0 3154
2ff48e98 3155 r = setsockopt_int(fd, SOL_SOCKET, SO_PASSCRED, true);
271f518f 3156 if (r < 0)
2ff48e98 3157 return log_error_errno(r, "SO_PASSCRED failed: %m");
9c1e04d0 3158
271f518f 3159 return TAKE_FD(fd);
9c1e04d0
AP		 3160}
3161
03cfe0d5
LP		 3162static int outer_child(
3163 Barrier *barrier,
3164 const char *directory,
2d845785 3165 DissectedImage *dissected_image,
03cfe0d5
LP		 3166 bool secondary,
3167 int pid_socket,
e01ff70a 3168 int uuid_socket,
9c1e04d0 3169 int notify_socket,
03cfe0d5
LP		 3170 int kmsg_socket,
3171 int rtnl_socket,
825d5287 3172 int uid_shift_socket,
3acc84eb 3173 int master_pty_socket,
8199d554 3174 int unified_cgroup_hierarchy_socket,
d7bea6b6
DP		 3175 FDSet *fds,
3176 int netns_fd) {
03cfe0d5 3177
bf428efb 3178 _cleanup_close_ int fd = -1;
03cfe0d5
LP		 3179 pid_t pid;
3180 ssize_t l;
de40a303 3181 int r;
03cfe0d5 3182
b37469d7
LP		 3183 /* This is the "outer" child process, i.e the one forked off by the container manager itself. It already has
3184 * its own CLONE_NEWNS namespace (which was created by the clone()). It still lives in the host's CLONE_NEWPID,
3185 * CLONE_NEWUTS, CLONE_NEWIPC, CLONE_NEWUSER and CLONE_NEWNET namespaces. After it completed a number of
3186 * initializations a second child (the "inner" one) is forked off it, and it exits. */
3187
03cfe0d5
LP		 3188 assert(barrier);
3189 assert(directory);
03cfe0d5 3190 assert(pid_socket >= 0);
e01ff70a 3191 assert(uuid_socket >= 0);
9c1e04d0 3192 assert(notify_socket >= 0);
3acc84eb 3193 assert(master_pty_socket >= 0);
03cfe0d5
LP		 3194 assert(kmsg_socket >= 0);
3195
de40a303
LP		 3196 log_debug("Outer child is initializing.");
3197
03cfe0d5
LP		 3198 if (prctl(PR_SET_PDEATHSIG, SIGKILL) < 0)
3199 return log_error_errno(errno, "PR_SET_PDEATHSIG failed: %m");
3200
03cfe0d5
LP		 3201 r = reset_audit_loginuid();
3202 if (r < 0)
3203 return r;
3204
3205 /* Mark everything as slave, so that we still
3206 * receive mounts from the real root, but don't
3207 * propagate mounts to the real root. */
60e76d48
ZJS		 3208 r = mount_verbose(LOG_ERR, NULL, "/", NULL, MS_SLAVE|MS_REC, NULL);
3209 if (r < 0)
3210 return r;
03cfe0d5 3211
2d845785 3212 if (dissected_image) {
2d3a5a73
LP		 3213 /* If we are operating on a disk image, then mount its root directory now, but leave out the rest. We
3214 * can read the UID shift from it if we need to. Further down we'll mount the rest, but then with the
3215 * uid shift known. That way we can mount VFAT file systems shifted to the right place right away. This
3216 * makes sure ESP partitions and userns are compatible. */
3217
3218 r = dissected_image_mount(dissected_image, directory, arg_uid_shift,
03bcb6d4
LP		 3219 DISSECT_IMAGE_MOUNT_ROOT_ONLY|DISSECT_IMAGE_DISCARD_ON_LOOP|
3220 (arg_read_only ? DISSECT_IMAGE_READ_ONLY : 0)|
3221 (arg_start_mode == START_BOOT ? DISSECT_IMAGE_VALIDATE_OS : 0));
2d845785
LP		 3222 if (r < 0)
3223 return r;
3224 }
03cfe0d5 3225
391567f4
LP		 3226 r = determine_uid_shift(directory);
3227 if (r < 0)
3228 return r;
3229
0de7acce 3230 if (arg_userns_mode != USER_NAMESPACE_NO) {
0e7ac751 3231 /* Let the parent know which UID shift we read from the image */
825d5287
RM		 3232 l = send(uid_shift_socket, &arg_uid_shift, sizeof(arg_uid_shift), MSG_NOSIGNAL);
3233 if (l < 0)
3234 return log_error_errno(errno, "Failed to send UID shift: %m");
baaa35ad
ZJS		 3235 if (l != sizeof(arg_uid_shift))
3236 return log_error_errno(SYNTHETIC_ERRNO(EIO),
3237 "Short write while sending UID shift.");
0e7ac751 3238
0de7acce 3239 if (arg_userns_mode == USER_NAMESPACE_PICK) {
0e7ac751
LP		 3240 /* When we are supposed to pick the UID shift, the parent will check now whether the UID shift
3241 * we just read from the image is available. If yes, it will send the UID shift back to us, if
3242 * not it will pick a different one, and send it back to us. */
3243
3244 l = recv(uid_shift_socket, &arg_uid_shift, sizeof(arg_uid_shift), 0);
3245 if (l < 0)
3246 return log_error_errno(errno, "Failed to recv UID shift: %m");
baaa35ad
ZJS		 3247 if (l != sizeof(arg_uid_shift))
3248 return log_error_errno(SYNTHETIC_ERRNO(EIO),
3249 "Short read while receiving UID shift.");
0e7ac751
LP		 3250 }
3251
ff6c6cc1
LP		 3252 log_full(arg_quiet ? LOG_DEBUG : LOG_INFO,
3253 "Selected user namespace base " UID_FMT " and range " UID_FMT ".", arg_uid_shift, arg_uid_range);
825d5287
RM		 3254 }
3255
e50cd82f
LP		 3256 if (!dissected_image) {
3257 /* Turn directory into bind mount */
3258 r = mount_verbose(LOG_ERR, directory, directory, NULL, MS_BIND|MS_REC, NULL);
3259 if (r < 0)
3260 return r;
3261 }
7d0ecdd6
LP		 3262
3263 r = setup_pivot_root(
3264 directory,
3265 arg_pivot_root_new,
3266 arg_pivot_root_old);
3267 if (r < 0)
3268 return r;
3269
3270 r = setup_volatile_mode(
3271 directory,
3272 arg_volatile_mode,
3273 arg_userns_mode != USER_NAMESPACE_NO,
3274 arg_uid_shift,
3275 arg_uid_range,
8f1ed04a 3276 arg_selinux_apifs_context);
7d0ecdd6
LP		 3277 if (r < 0)
3278 return r;
3279
2d3a5a73
LP		 3280 if (dissected_image) {
3281 /* Now we know the uid shift, let's now mount everything else that might be in the image. */
3282 r = dissected_image_mount(dissected_image, directory, arg_uid_shift,
3283 DISSECT_IMAGE_MOUNT_NON_ROOT_ONLY|DISSECT_IMAGE_DISCARD_ON_LOOP|(arg_read_only ? DISSECT_IMAGE_READ_ONLY : 0));
3284 if (r < 0)
3285 return r;
3286 }
3287
8199d554
LP		 3288 if (arg_unified_cgroup_hierarchy == CGROUP_UNIFIED_UNKNOWN) {
3289 /* OK, we don't know yet which cgroup mode to use yet. Let's figure it out, and tell the parent. */
3290
3291 r = detect_unified_cgroup_hierarchy_from_image(directory);
3292 if (r < 0)
3293 return r;
3294
3295 l = send(unified_cgroup_hierarchy_socket, &arg_unified_cgroup_hierarchy, sizeof(arg_unified_cgroup_hierarchy), MSG_NOSIGNAL);
3296 if (l < 0)
3297 return log_error_errno(errno, "Failed to send cgroup mode: %m");
baaa35ad
ZJS		 3298 if (l != sizeof(arg_unified_cgroup_hierarchy))
3299 return log_error_errno(SYNTHETIC_ERRNO(EIO),
3300 "Short write while sending cgroup mode.");
8199d554
LP		 3301
3302 unified_cgroup_hierarchy_socket = safe_close(unified_cgroup_hierarchy_socket);
3303 }
3304
4ad14eff
LP		 3305 /* Mark everything as shared so our mounts get propagated down. This is
3306 * required to make new bind mounts available in systemd services
5238e957 3307 * inside the container that create a new mount namespace.
4ad14eff
LP		 3308 * See https://github.com/systemd/systemd/issues/3860
3309 * Further submounts (such as /dev) done after this will inherit the
13e785f7 3310 * shared propagation mode. */
4ad14eff
LP		 3311 r = mount_verbose(LOG_ERR, NULL, directory, NULL, MS_SHARED|MS_REC, NULL);
3312 if (r < 0)
3313 return r;
3314
3315 r = recursive_chown(directory, arg_uid_shift, arg_uid_range);
3316 if (r < 0)
3317 return r;
3318
03cfe0d5
LP		 3319 r = base_filesystem_create(directory, arg_uid_shift, (gid_t) arg_uid_shift);
3320 if (r < 0)
3321 return r;
3322
e5a4bb0d 3323 if (arg_read_only && arg_volatile_mode == VOLATILE_NO) {
64e82c19 3324 r = bind_remount_recursive(directory, MS_RDONLY, MS_RDONLY, NULL);
03cfe0d5
LP		 3325 if (r < 0)
3326 return log_error_errno(r, "Failed to make tree read-only: %m");
3327 }
3328
0de7acce 3329 r = mount_all(directory,
4f086aab 3330 arg_mount_settings,
0de7acce 3331 arg_uid_shift,
0de7acce 3332 arg_selinux_apifs_context);
03cfe0d5
LP		 3333 if (r < 0)
3334 return r;
3335
07fa00f9
LP		 3336 r = copy_devnodes(directory);
3337 if (r < 0)
03cfe0d5
LP		 3338 return r;
3339
de40a303
LP		 3340 r = make_extra_nodes(directory);
3341 if (r < 0)
3342 return r;
3343
3344 (void) dev_setup(directory, arg_uid_shift, arg_uid_shift);
3345 (void) make_inaccessible_nodes(directory, arg_uid_shift, arg_uid_shift);
03cfe0d5 3346
07fa00f9
LP		 3347 r = setup_pts(directory);
3348 if (r < 0)
03cfe0d5
LP		 3349 return r;
3350
3351 r = setup_propagate(directory);
3352 if (r < 0)
3353 return r;
3354
8e5430c4
LP		 3355 r = setup_keyring();
3356 if (r < 0)
3357 return r;
3358
03cfe0d5
LP		 3359 r = setup_timezone(directory);
3360 if (r < 0)
3361 return r;
3362
3363 r = setup_resolv_conf(directory);
3364 if (r < 0)
3365 return r;
3366
e01ff70a
MS		 3367 r = setup_machine_id(directory);
3368 if (r < 0)
3369 return r;
3370
03cfe0d5
LP		 3371 r = setup_journal(directory);
3372 if (r < 0)
3373 return r;
3374
0de7acce
LP		 3375 r = mount_custom(
3376 directory,
3377 arg_custom_mounts,
3378 arg_n_custom_mounts,
3379 arg_userns_mode != USER_NAMESPACE_NO,
3380 arg_uid_shift,
3381 arg_uid_range,
de40a303
LP		 3382 arg_selinux_apifs_context,
3383 false);
03cfe0d5
LP		 3384 if (r < 0)
3385 return r;
3386
489fae52 3387 if (!arg_use_cgns) {
0996ef00
CB		 3388 r = mount_cgroups(
3389 directory,
3390 arg_unified_cgroup_hierarchy,
3391 arg_userns_mode != USER_NAMESPACE_NO,
3392 arg_uid_shift,
3393 arg_uid_range,
5a8ff0e6 3394 arg_selinux_apifs_context,
ada54120 3395 false);
0996ef00
CB		 3396 if (r < 0)
3397 return r;
3398 }
03cfe0d5
LP		 3399
3400 r = mount_move_root(directory);
3401 if (r < 0)
3402 return log_error_errno(r, "Failed to move root directory: %m");
3403
9c1e04d0
AP		 3404 fd = setup_sd_notify_child();
3405 if (fd < 0)
3406 return fd;
3407
03cfe0d5 3408 pid = raw_clone(SIGCHLD|CLONE_NEWNS|
0c582db0 3409 arg_clone_ns_flags |
8869a0b4 3410 (arg_userns_mode != USER_NAMESPACE_NO ? CLONE_NEWUSER : 0));
03cfe0d5
LP		 3411 if (pid < 0)
3412 return log_error_errno(errno, "Failed to fork inner child: %m");
03cfe0d5
LP		 3413 if (pid == 0) {
3414 pid_socket = safe_close(pid_socket);
e01ff70a 3415 uuid_socket = safe_close(uuid_socket);
9c1e04d0 3416 notify_socket = safe_close(notify_socket);
825d5287 3417 uid_shift_socket = safe_close(uid_shift_socket);
03cfe0d5
LP		 3418
3419 /* The inner child has all namespaces that are
3420 * requested, so that we all are owned by the user if
3421 * user namespaces are turned on. */
3422
d7bea6b6
DP		 3423 if (arg_network_namespace_path) {
3424 r = namespace_enter(-1, -1, netns_fd, -1, -1);
3425 if (r < 0)
e2d39e54 3426 return log_error_errno(r, "Failed to join network namespace: %m");
d7bea6b6
DP		 3427 }
3428
3acc84eb 3429 r = inner_child(barrier, directory, secondary, kmsg_socket, rtnl_socket, master_pty_socket, fds);
03cfe0d5
LP		 3430 if (r < 0)
3431 _exit(EXIT_FAILURE);
3432
3433 _exit(EXIT_SUCCESS);
3434 }
3435
3436 l = send(pid_socket, &pid, sizeof(pid), MSG_NOSIGNAL);
3437 if (l < 0)
3438 return log_error_errno(errno, "Failed to send PID: %m");
baaa35ad
ZJS		 3439 if (l != sizeof(pid))
3440 return log_error_errno(SYNTHETIC_ERRNO(EIO),
3441 "Short write while sending PID.");
03cfe0d5 3442
e01ff70a
MS		 3443 l = send(uuid_socket, &arg_uuid, sizeof(arg_uuid), MSG_NOSIGNAL);
3444 if (l < 0)
3445 return log_error_errno(errno, "Failed to send machine ID: %m");
baaa35ad
ZJS		 3446 if (l != sizeof(arg_uuid))
3447 return log_error_errno(SYNTHETIC_ERRNO(EIO),
3448 "Short write while sending machine ID.");
e01ff70a 3449
9c1e04d0
AP		 3450 l = send_one_fd(notify_socket, fd, 0);
3451 if (l < 0)
ba72801d 3452 return log_error_errno(l, "Failed to send notify fd: %m");
9c1e04d0 3453
03cfe0d5 3454 pid_socket = safe_close(pid_socket);
e01ff70a 3455 uuid_socket = safe_close(uuid_socket);
9c1e04d0 3456 notify_socket = safe_close(notify_socket);
3acc84eb 3457 master_pty_socket = safe_close(master_pty_socket);
327e26d6
KN		 3458 kmsg_socket = safe_close(kmsg_socket);
3459 rtnl_socket = safe_close(rtnl_socket);
d7bea6b6 3460 netns_fd = safe_close(netns_fd);
03cfe0d5
LP		 3461
3462 return 0;
3463}
3464
0e7ac751 3465static int uid_shift_pick(uid_t *shift, LockFile *ret_lock_file) {
d381c8a6 3466 bool tried_hashed = false;
0e7ac751
LP		 3467 unsigned n_tries = 100;
3468 uid_t candidate;
3469 int r;
3470
3471 assert(shift);
3472 assert(ret_lock_file);
0de7acce 3473 assert(arg_userns_mode == USER_NAMESPACE_PICK);
0e7ac751
LP		 3474 assert(arg_uid_range == 0x10000U);
3475
3476 candidate = *shift;
3477
3478 (void) mkdir("/run/systemd/nspawn-uid", 0755);
3479
3480 for (;;) {
fbd0b64f 3481 char lock_path[STRLEN("/run/systemd/nspawn-uid/") + DECIMAL_STR_MAX(uid_t) + 1];
8e766630 3482 _cleanup_(release_lock_file) LockFile lf = LOCK_FILE_INIT;
0e7ac751
LP		 3483
3484 if (--n_tries <= 0)
3485 return -EBUSY;
3486
87d5e4f2 3487 if (candidate < CONTAINER_UID_BASE_MIN || candidate > CONTAINER_UID_BASE_MAX)
0e7ac751
LP		 3488 goto next;
3489 if ((candidate & UINT32_C(0xFFFF)) != 0)
3490 goto next;
3491
3492 xsprintf(lock_path, "/run/systemd/nspawn-uid/" UID_FMT, candidate);
3493 r = make_lock_file(lock_path, LOCK_EX|LOCK_NB, &lf);
3494 if (r == -EBUSY) /* Range already taken by another nspawn instance */
3495 goto next;
3496 if (r < 0)
3497 return r;
3498
3499 /* Make some superficial checks whether the range is currently known in the user database */
3500 if (getpwuid(candidate))
3501 goto next;
3502 if (getpwuid(candidate + UINT32_C(0xFFFE)))
3503 goto next;
3504 if (getgrgid(candidate))
3505 goto next;
3506 if (getgrgid(candidate + UINT32_C(0xFFFE)))
3507 goto next;
3508
3509 *ret_lock_file = lf;
3510 lf = (struct LockFile) LOCK_FILE_INIT;
3511 *shift = candidate;
3512 return 0;
3513
3514 next:
d381c8a6
LP		 3515 if (arg_machine && !tried_hashed) {
3516 /* Try to hash the base from the container name */
3517
3518 static const uint8_t hash_key[] = {
3519 0xe1, 0x56, 0xe0, 0xf0, 0x4a, 0xf0, 0x41, 0xaf,
3520 0x96, 0x41, 0xcf, 0x41, 0x33, 0x94, 0xff, 0x72
3521 };
3522
3523 candidate = (uid_t) siphash24(arg_machine, strlen(arg_machine), hash_key);
3524
3525 tried_hashed = true;
3526 } else
3527 random_bytes(&candidate, sizeof(candidate));
3528
87d5e4f2 3529 candidate = (candidate % (CONTAINER_UID_BASE_MAX - CONTAINER_UID_BASE_MIN)) + CONTAINER_UID_BASE_MIN;
0e7ac751
LP		 3530 candidate &= (uid_t) UINT32_C(0xFFFF0000);
3531 }
3532}
3533
03cfe0d5 3534static int setup_uid_map(pid_t pid) {
fbd0b64f 3535 char uid_map[STRLEN("/proc//uid_map") + DECIMAL_STR_MAX(uid_t) + 1], line[DECIMAL_STR_MAX(uid_t)*3+3+1];
03cfe0d5
LP		 3536 int r;
3537
3538 assert(pid > 1);
3539
3540 xsprintf(uid_map, "/proc/" PID_FMT "/uid_map", pid);
3541 xsprintf(line, UID_FMT " " UID_FMT " " UID_FMT "\n", 0, arg_uid_shift, arg_uid_range);
57512c89 3542 r = write_string_file(uid_map, line, WRITE_STRING_FILE_DISABLE_BUFFER);
03cfe0d5
LP		 3543 if (r < 0)
3544 return log_error_errno(r, "Failed to write UID map: %m");
3545
3546 /* We always assign the same UID and GID ranges */
3547 xsprintf(uid_map, "/proc/" PID_FMT "/gid_map", pid);
57512c89 3548 r = write_string_file(uid_map, line, WRITE_STRING_FILE_DISABLE_BUFFER);
03cfe0d5
LP		 3549 if (r < 0)
3550 return log_error_errno(r, "Failed to write GID map: %m");
3551
3552 return 0;
3553}
3554
9c1e04d0 3555static int nspawn_dispatch_notify_fd(sd_event_source *source, int fd, uint32_t revents, void *userdata) {
9c1e04d0
AP		 3556 char buf[NOTIFY_BUFFER_MAX+1];
3557 char *p = NULL;
3558 struct iovec iovec = {
3559 .iov_base = buf,
3560 .iov_len = sizeof(buf)-1,
3561 };
3562 union {
3563 struct cmsghdr cmsghdr;
3564 uint8_t buf[CMSG_SPACE(sizeof(struct ucred)) +
3565 CMSG_SPACE(sizeof(int) * NOTIFY_FD_MAX)];
3566 } control = {};
3567 struct msghdr msghdr = {
3568 .msg_iov = &iovec,
3569 .msg_iovlen = 1,
3570 .msg_control = &control,
3571 .msg_controllen = sizeof(control),
3572 };
3573 struct cmsghdr *cmsg;
3574 struct ucred *ucred = NULL;
3575 ssize_t n;
3576 pid_t inner_child_pid;
3577 _cleanup_strv_free_ char **tags = NULL;
3578
3579 assert(userdata);
3580
3581 inner_child_pid = PTR_TO_PID(userdata);
3582
3583 if (revents != EPOLLIN) {
3584 log_warning("Got unexpected poll event for notify fd.");
3585 return 0;
3586 }
3587
3588 n = recvmsg(fd, &msghdr, MSG_DONTWAIT|MSG_CMSG_CLOEXEC);
3589 if (n < 0) {
3742095b 3590 if (IN_SET(errno, EAGAIN, EINTR))
9c1e04d0
AP		 3591 return 0;
3592
3593 return log_warning_errno(errno, "Couldn't read notification socket: %m");
3594 }
3595 cmsg_close_all(&msghdr);
3596
3597 CMSG_FOREACH(cmsg, &msghdr) {
3598 if (cmsg->cmsg_level == SOL_SOCKET &&
3599 cmsg->cmsg_type == SCM_CREDENTIALS &&
3600 cmsg->cmsg_len == CMSG_LEN(sizeof(struct ucred))) {
3601
3602 ucred = (struct ucred*) CMSG_DATA(cmsg);
3603 }
3604 }
3605
3606 if (!ucred || ucred->pid != inner_child_pid) {
8cb57430 3607 log_debug("Received notify message without valid credentials. Ignoring.");
9c1e04d0
AP		 3608 return 0;
3609 }
3610
3611 if ((size_t) n >= sizeof(buf)) {
3612 log_warning("Received notify message exceeded maximum size. Ignoring.");
3613 return 0;
3614 }
3615
3616 buf[n] = 0;
3617 tags = strv_split(buf, "\n\r");
3618 if (!tags)
3619 return log_oom();
3620
3621 if (strv_find(tags, "READY=1"))
04f590a4 3622 (void) sd_notifyf(false, "READY=1\n");
9c1e04d0
AP		 3623
3624 p = strv_find_startswith(tags, "STATUS=");
3625 if (p)
04f590a4 3626 (void) sd_notifyf(false, "STATUS=Container running: %s", p);
9c1e04d0
AP		 3627
3628 return 0;
3629}
3630
5773024d 3631static int setup_sd_notify_parent(sd_event *event, int fd, pid_t *inner_child_pid, sd_event_source **notify_event_source) {
9c1e04d0 3632 int r;
9c1e04d0 3633
5773024d 3634 r = sd_event_add_io(event, notify_event_source, fd, EPOLLIN, nspawn_dispatch_notify_fd, inner_child_pid);
9c1e04d0
AP		 3635 if (r < 0)
3636 return log_error_errno(r, "Failed to allocate notify event source: %m");
3637
5773024d 3638 (void) sd_event_source_set_description(*notify_event_source, "nspawn-notify");
9c1e04d0
AP		 3639
3640 return 0;
3641}
3642
5d961407
LP		 3643static int merge_settings(Settings *settings, const char *path) {
3644 int rl;
f757855e 3645
5d961407
LP		 3646 assert(settings);
3647 assert(path);
f757855e 3648
5d961407
LP		 3649 /* Copy over bits from the settings, unless they have been explicitly masked by command line switches. Note
3650 * that this steals the fields of the Settings* structure, and hence modifies it. */
f757855e 3651
7732f92b
LP		 3652 if ((arg_settings_mask & SETTING_START_MODE) == 0 &&
3653 settings->start_mode >= 0) {
3654 arg_start_mode = settings->start_mode;
130d3d22 3655 strv_free_and_replace(arg_parameters, settings->parameters);
f757855e
LP		 3656 }
3657
a2f577fc
JL		 3658 if ((arg_settings_mask & SETTING_EPHEMERAL) == 0)
3659 arg_ephemeral = settings->ephemeral;
3660
de40a303
LP		 3661 if ((arg_settings_mask & SETTING_DIRECTORY) == 0 &&
3662 settings->root) {
3663
3664 if (!arg_settings_trusted)
3665 log_warning("Ignoring root directory setting, file %s is not trusted.", path);
3666 else
3667 free_and_replace(arg_directory, settings->root);
3668 }
3669
b53ede69
PW		 3670 if ((arg_settings_mask & SETTING_PIVOT_ROOT) == 0 &&
3671 settings->pivot_root_new) {
3672 free_and_replace(arg_pivot_root_new, settings->pivot_root_new);
3673 free_and_replace(arg_pivot_root_old, settings->pivot_root_old);
3674 }
3675
5f932eb9 3676 if ((arg_settings_mask & SETTING_WORKING_DIRECTORY) == 0 &&
1cc6c93a
YW		 3677 settings->working_directory)
3678 free_and_replace(arg_chdir, settings->working_directory);
5f932eb9 3679
f757855e 3680 if ((arg_settings_mask & SETTING_ENVIRONMENT) == 0 &&
130d3d22
YW		 3681 settings->environment)
3682 strv_free_and_replace(arg_setenv, settings->environment);
f757855e 3683
de40a303
LP		 3684 if ((arg_settings_mask & SETTING_USER) == 0) {
3685
3686 if (settings->user)
3687 free_and_replace(arg_user, settings->user);
3688
3689 if (uid_is_valid(settings->uid))
3690 arg_uid = settings->uid;
3691 if (gid_is_valid(settings->gid))
3692 arg_gid = settings->gid;
3693 if (settings->n_supplementary_gids > 0) {
3694 free_and_replace(arg_supplementary_gids, settings->supplementary_gids);
3695 arg_n_supplementary_gids = settings->n_supplementary_gids;
3696 }
3697 }
f757855e
LP		 3698
3699 if ((arg_settings_mask & SETTING_CAPABILITY) == 0) {
a3fc6b55 3700 uint64_t plus, minus;
f757855e 3701
de40a303
LP		 3702 /* Note that we copy both the simple plus/minus caps here, and the full quintet from the
3703 * Settings structure */
3704
0e265674 3705 plus = settings->capability;
a3fc6b55
LP		 3706 minus = settings->drop_capability;
3707
3708 if ((arg_settings_mask & SETTING_NETWORK) == 0) {
3709 if (settings_private_network(settings))
3710 plus |= UINT64_C(1) << CAP_NET_ADMIN;
3711 else
3712 minus |= UINT64_C(1) << CAP_NET_ADMIN;
3713 }
0e265674
LP		 3714
3715 if (!arg_settings_trusted && plus != 0) {
3716 if (settings->capability != 0)
5d961407 3717 log_warning("Ignoring Capability= setting, file %s is not trusted.", path);
0e265674 3718 } else
520e0d54 3719 arg_caps_retain |= plus;
f757855e 3720
a3fc6b55 3721 arg_caps_retain &= ~minus;
de40a303
LP		 3722
3723 /* Copy the full capabilities over too */
3724 if (capability_quintet_is_set(&settings->full_capabilities)) {
3725 if (!arg_settings_trusted)
5238e957 3726 log_warning("Ignoring capability settings, file %s is not trusted.", path);
de40a303
LP		 3727 else
3728 arg_full_capabilities = settings->full_capabilities;
3729 }
f757855e
LP		 3730 }
3731
3732 if ((arg_settings_mask & SETTING_KILL_SIGNAL) == 0 &&
3733 settings->kill_signal > 0)
3734 arg_kill_signal = settings->kill_signal;
3735
3736 if ((arg_settings_mask & SETTING_PERSONALITY) == 0 &&
3737 settings->personality != PERSONALITY_INVALID)
3738 arg_personality = settings->personality;
3739
3740 if ((arg_settings_mask & SETTING_MACHINE_ID) == 0 &&
3741 !sd_id128_is_null(settings->machine_id)) {
3742
3743 if (!arg_settings_trusted)
5d961407 3744 log_warning("Ignoring MachineID= setting, file %s is not trusted.", path);
f757855e
LP		 3745 else
3746 arg_uuid = settings->machine_id;
3747 }
3748
3749 if ((arg_settings_mask & SETTING_READ_ONLY) == 0 &&
3750 settings->read_only >= 0)
3751 arg_read_only = settings->read_only;
3752
3753 if ((arg_settings_mask & SETTING_VOLATILE_MODE) == 0 &&
3754 settings->volatile_mode != _VOLATILE_MODE_INVALID)
3755 arg_volatile_mode = settings->volatile_mode;
3756
3757 if ((arg_settings_mask & SETTING_CUSTOM_MOUNTS) == 0 &&
3758 settings->n_custom_mounts > 0) {
3759
3760 if (!arg_settings_trusted)
5d961407 3761 log_warning("Ignoring TemporaryFileSystem=, Bind= and BindReadOnly= settings, file %s is not trusted.", path);
f757855e
LP		 3762 else {
3763 custom_mount_free_all(arg_custom_mounts, arg_n_custom_mounts);
1cc6c93a 3764 arg_custom_mounts = TAKE_PTR(settings->custom_mounts);
f757855e 3765 arg_n_custom_mounts = settings->n_custom_mounts;
f757855e
LP		 3766 settings->n_custom_mounts = 0;
3767 }
3768 }
3769
3770 if ((arg_settings_mask & SETTING_NETWORK) == 0 &&
3771 (settings->private_network >= 0 ||
3772 settings->network_veth >= 0 ||
3773 settings->network_bridge ||
22b28dfd 3774 settings->network_zone ||
f757855e
LP		 3775 settings->network_interfaces ||
3776 settings->network_macvlan ||
f6d6bad1 3777 settings->network_ipvlan ||
de40a303
LP		 3778 settings->network_veth_extra ||
3779 settings->network_namespace_path)) {
f757855e
LP		 3780
3781 if (!arg_settings_trusted)
5d961407 3782 log_warning("Ignoring network settings, file %s is not trusted.", path);
f757855e 3783 else {
f6d6bad1 3784 arg_network_veth = settings_network_veth(settings);
0e265674
LP		 3785 arg_private_network = settings_private_network(settings);
3786
130d3d22
YW		 3787 strv_free_and_replace(arg_network_interfaces, settings->network_interfaces);
3788 strv_free_and_replace(arg_network_macvlan, settings->network_macvlan);
3789 strv_free_and_replace(arg_network_ipvlan, settings->network_ipvlan);
3790 strv_free_and_replace(arg_network_veth_extra, settings->network_veth_extra);
f6d6bad1 3791
1cc6c93a
YW		 3792 free_and_replace(arg_network_bridge, settings->network_bridge);
3793 free_and_replace(arg_network_zone, settings->network_zone);
de40a303
LP		 3794
3795 free_and_replace(arg_network_namespace_path, settings->network_namespace_path);
f757855e
LP		 3796 }
3797 }
3798
3799 if ((arg_settings_mask & SETTING_EXPOSE_PORTS) == 0 &&
3800 settings->expose_ports) {
3801
3802 if (!arg_settings_trusted)
5d961407 3803 log_warning("Ignoring Port= setting, file %s is not trusted.", path);
f757855e
LP		 3804 else {
3805 expose_port_free_all(arg_expose_ports);
1cc6c93a 3806 arg_expose_ports = TAKE_PTR(settings->expose_ports);
f757855e
LP		 3807 }
3808 }
3809
0de7acce
LP		 3810 if ((arg_settings_mask & SETTING_USERNS) == 0 &&
3811 settings->userns_mode != _USER_NAMESPACE_MODE_INVALID) {
3812
3813 if (!arg_settings_trusted)
5d961407 3814 log_warning("Ignoring PrivateUsers= and PrivateUsersChown= settings, file %s is not trusted.", path);
0de7acce
LP		 3815 else {
3816 arg_userns_mode = settings->userns_mode;
3817 arg_uid_shift = settings->uid_shift;
3818 arg_uid_range = settings->uid_range;
3819 arg_userns_chown = settings->userns_chown;
3820 }
3821 }
3822
9c1e04d0
AP		 3823 if ((arg_settings_mask & SETTING_NOTIFY_READY) == 0)
3824 arg_notify_ready = settings->notify_ready;
3825
960e4569
LP		 3826 if ((arg_settings_mask & SETTING_SYSCALL_FILTER) == 0) {
3827
de40a303 3828 if (!arg_settings_trusted && !strv_isempty(settings->syscall_whitelist))
5d961407 3829 log_warning("Ignoring SystemCallFilter= settings, file %s is not trusted.", path);
960e4569 3830 else {
130d3d22
YW		 3831 strv_free_and_replace(arg_syscall_whitelist, settings->syscall_whitelist);
3832 strv_free_and_replace(arg_syscall_blacklist, settings->syscall_blacklist);
960e4569 3833 }
de40a303
LP		 3834
3835#if HAVE_SECCOMP
3836 if (!arg_settings_trusted && settings->seccomp)
3837 log_warning("Ignoring SECCOMP filter, file %s is not trusted.", path);
3838 else {
3839 seccomp_release(arg_seccomp);
3840 arg_seccomp = TAKE_PTR(settings->seccomp);
3841 }
3842#endif
960e4569
LP		 3843 }
3844
bf428efb
LP		 3845 for (rl = 0; rl < _RLIMIT_MAX; rl ++) {
3846 if ((arg_settings_mask & (SETTING_RLIMIT_FIRST << rl)))
3847 continue;
3848
3849 if (!settings->rlimit[rl])
3850 continue;
3851
3852 if (!arg_settings_trusted) {
5d961407 3853 log_warning("Ignoring Limit%s= setting, file '%s' is not trusted.", rlimit_to_string(rl), path);
bf428efb
LP		 3854 continue;
3855 }
3856
3857 free_and_replace(arg_rlimit[rl], settings->rlimit[rl]);
3858 }
3859
3a9530e5
LP		 3860 if ((arg_settings_mask & SETTING_HOSTNAME) == 0 &&
3861 settings->hostname)
3862 free_and_replace(arg_hostname, settings->hostname);
3863
66edd963
LP		 3864 if ((arg_settings_mask & SETTING_NO_NEW_PRIVILEGES) == 0 &&
3865 settings->no_new_privileges >= 0)
3866 arg_no_new_privileges = settings->no_new_privileges;
3867
81f345df
LP		 3868 if ((arg_settings_mask & SETTING_OOM_SCORE_ADJUST) == 0 &&
3869 settings->oom_score_adjust_set) {
3870
3871 if (!arg_settings_trusted)
5d961407 3872 log_warning("Ignoring OOMScoreAdjust= setting, file '%s' is not trusted.", path);
81f345df
LP		 3873 else {
3874 arg_oom_score_adjust = settings->oom_score_adjust;
3875 arg_oom_score_adjust_set = true;
3876 }
3877 }
3878
d107bb7d 3879 if ((arg_settings_mask & SETTING_CPU_AFFINITY) == 0 &&
0985c7c4 3880 settings->cpu_set.set) {
d107bb7d
LP		 3881
3882 if (!arg_settings_trusted)
5d961407 3883 log_warning("Ignoring CPUAffinity= setting, file '%s' is not trusted.", path);
d107bb7d 3884 else {
0985c7c4
ZJS		 3885 cpu_set_reset(&arg_cpu_set);
3886 arg_cpu_set = settings->cpu_set;
3887 settings->cpu_set = (CPUSet) {};
d107bb7d
LP		 3888 }
3889 }
3890
09d423e9
LP		 3891 if ((arg_settings_mask & SETTING_RESOLV_CONF) == 0 &&
3892 settings->resolv_conf != _RESOLV_CONF_MODE_INVALID)
3893 arg_resolv_conf = settings->resolv_conf;
3894
4e1d6aa9
LP		 3895 if ((arg_settings_mask & SETTING_LINK_JOURNAL) == 0 &&
3896 settings->link_journal != _LINK_JOURNAL_INVALID) {
3897
3898 if (!arg_settings_trusted)
3899 log_warning("Ignoring journal link setting, file '%s' is not trusted.", path);
3900 else {
3901 arg_link_journal = settings->link_journal;
3902 arg_link_journal_try = settings->link_journal_try;
3903 }
3904 }
3905
1688841f
LP		 3906 if ((arg_settings_mask & SETTING_TIMEZONE) == 0 &&
3907 settings->timezone != _TIMEZONE_MODE_INVALID)
3908 arg_timezone = settings->timezone;
3909
de40a303
LP		 3910 if ((arg_settings_mask & SETTING_SLICE) == 0 &&
3911 settings->slice) {
3912
3913 if (!arg_settings_trusted)
3914 log_warning("Ignoring slice setting, file '%s' is not trusted.", path);
3915 else
3916 free_and_replace(arg_slice, settings->slice);
3917 }
3918
3919 if ((arg_settings_mask & SETTING_USE_CGNS) == 0 &&
3920 settings->use_cgns >= 0) {
3921
3922 if (!arg_settings_trusted)
3923 log_warning("Ignoring cgroup namespace setting, file '%s' is not trusted.", path);
3924 else
3925 arg_use_cgns = settings->use_cgns;
3926 }
3927
3928 if ((arg_settings_mask & SETTING_CLONE_NS_FLAGS) == 0 &&
3929 settings->clone_ns_flags != (unsigned long) -1) {
3930
3931 if (!arg_settings_trusted)
3932 log_warning("Ignoring namespace setting, file '%s' is not trusted.", path);
3933 else
3934 arg_clone_ns_flags = settings->clone_ns_flags;
3935 }
3936
3937 if ((arg_settings_mask & SETTING_CONSOLE_MODE) == 0 &&
3938 settings->console_mode >= 0) {
3939
3940 if (!arg_settings_trusted)
3941 log_warning("Ignoring console mode setting, file '%s' is not trusted.", path);
3942 else
3943 arg_console_mode = settings->console_mode;
3944 }
3945
3946 /* The following properties can only be set through the OCI settings logic, not from the command line, hence we
3947 * don't consult arg_settings_mask for them. */
3948
3949 sd_bus_message_unref(arg_property_message);
3950 arg_property_message = TAKE_PTR(settings->properties);
3951
3952 arg_console_width = settings->console_width;
3953 arg_console_height = settings->console_height;
3954
b2645747 3955 device_node_array_free(arg_extra_nodes, arg_n_extra_nodes);
de40a303
LP		 3956 arg_extra_nodes = TAKE_PTR(settings->extra_nodes);
3957 arg_n_extra_nodes = settings->n_extra_nodes;
3958
f757855e
LP		 3959 return 0;
3960}
3961
5d961407
LP		 3962static int load_settings(void) {
3963 _cleanup_(settings_freep) Settings *settings = NULL;
3964 _cleanup_fclose_ FILE *f = NULL;
3965 _cleanup_free_ char *p = NULL;
3966 const char *fn, *i;
3967 int r;
3968
de40a303
LP		 3969 if (arg_oci_bundle)
3970 return 0;
3971
5d961407
LP		 3972 /* If all settings are masked, there's no point in looking for
3973 * the settings file */
3974 if ((arg_settings_mask & _SETTINGS_MASK_ALL) == _SETTINGS_MASK_ALL)
3975 return 0;
3976
3977 fn = strjoina(arg_machine, ".nspawn");
3978
3979 /* We first look in the admin's directories in /etc and /run */
3980 FOREACH_STRING(i, "/etc/systemd/nspawn", "/run/systemd/nspawn") {
3981 _cleanup_free_ char *j = NULL;
3982
3983 j = strjoin(i, "/", fn);
3984 if (!j)
3985 return log_oom();
3986
3987 f = fopen(j, "re");
3988 if (f) {
3989 p = TAKE_PTR(j);
3990
3991 /* By default, we trust configuration from /etc and /run */
3992 if (arg_settings_trusted < 0)
3993 arg_settings_trusted = true;
3994
3995 break;
3996 }
3997
3998 if (errno != ENOENT)
3999 return log_error_errno(errno, "Failed to open %s: %m", j);
4000 }
4001
4002 if (!f) {
4003 /* After that, let's look for a file next to the
4004 * actual image we shall boot. */
4005
4006 if (arg_image) {
4007 p = file_in_same_dir(arg_image, fn);
4008 if (!p)
4009 return log_oom();
4010 } else if (arg_directory) {
4011 p = file_in_same_dir(arg_directory, fn);
4012 if (!p)
4013 return log_oom();
4014 }
4015
4016 if (p) {
4017 f = fopen(p, "re");
4018 if (!f && errno != ENOENT)
4019 return log_error_errno(errno, "Failed to open %s: %m", p);
4020
4021 /* By default, we do not trust configuration from /var/lib/machines */
4022 if (arg_settings_trusted < 0)
4023 arg_settings_trusted = false;
4024 }
4025 }
4026
4027 if (!f)
4028 return 0;
4029
4030 log_debug("Settings are trusted: %s", yes_no(arg_settings_trusted));
4031
4032 r = settings_load(f, p, &settings);
4033 if (r < 0)
4034 return r;
4035
4036 return merge_settings(settings, p);
4037}
4038
de40a303
LP		 4039static int load_oci_bundle(void) {
4040 _cleanup_(settings_freep) Settings *settings = NULL;
4041 int r;
4042
4043 if (!arg_oci_bundle)
4044 return 0;
4045
4046 /* By default let's trust OCI bundles */
4047 if (arg_settings_trusted < 0)
4048 arg_settings_trusted = true;
4049
4050 r = oci_load(NULL, arg_oci_bundle, &settings);
4051 if (r < 0)
4052 return r;
4053
4054 return merge_settings(settings, arg_oci_bundle);
4055}
4056
3acc84eb 4057static int run_container(
2d845785 4058 DissectedImage *dissected_image,
b0067625
ZJS		 4059 bool secondary,
4060 FDSet *fds,
4061 char veth_name[IFNAMSIZ], bool *veth_created,
4062 union in_addr_union *exposed,
3acc84eb 4063 int *master, pid_t *pid, int *ret) {
b0067625
ZJS		 4064
4065 static const struct sigaction sa = {
4066 .sa_handler = nop_signal_handler,
e28c7cd0 4067 .sa_flags = SA_NOCLDSTOP|SA_RESTART,
b0067625
ZJS		 4068 };
4069
8e766630 4070 _cleanup_(release_lock_file) LockFile uid_shift_lock = LOCK_FILE_INIT;
b0067625
ZJS		 4071 _cleanup_close_ int etc_passwd_lock = -1;
4072 _cleanup_close_pair_ int
4073 kmsg_socket_pair[2] = { -1, -1 },
4074 rtnl_socket_pair[2] = { -1, -1 },
4075 pid_socket_pair[2] = { -1, -1 },
4076 uuid_socket_pair[2] = { -1, -1 },
4077 notify_socket_pair[2] = { -1, -1 },
8199d554 4078 uid_shift_socket_pair[2] = { -1, -1 },
3acc84eb 4079 master_pty_socket_pair[2] = { -1, -1 },
8199d554
LP		 4080 unified_cgroup_hierarchy_socket_pair[2] = { -1, -1};
4081
3acc84eb 4082 _cleanup_close_ int notify_socket = -1;
b0067625 4083 _cleanup_(barrier_destroy) Barrier barrier = BARRIER_NULL;
5773024d 4084 _cleanup_(sd_event_source_unrefp) sd_event_source *notify_event_source = NULL;
b0067625
ZJS		 4085 _cleanup_(sd_event_unrefp) sd_event *event = NULL;
4086 _cleanup_(pty_forward_freep) PTYForward *forward = NULL;
4087 _cleanup_(sd_netlink_unrefp) sd_netlink *rtnl = NULL;
abdb9b08 4088 _cleanup_(sd_bus_flush_close_unrefp) sd_bus *bus = NULL;
b0067625 4089 ContainerStatus container_status = 0;
b0067625
ZJS		 4090 int ifi = 0, r;
4091 ssize_t l;
4092 sigset_t mask_chld;
d7bea6b6 4093 _cleanup_close_ int netns_fd = -1;
b0067625
ZJS		 4094
4095 assert_se(sigemptyset(&mask_chld) == 0);
4096 assert_se(sigaddset(&mask_chld, SIGCHLD) == 0);
4097
4098 if (arg_userns_mode == USER_NAMESPACE_PICK) {
4099 /* When we shall pick the UID/GID range, let's first lock /etc/passwd, so that we can safely
4100 * check with getpwuid() if the specific user already exists. Note that /etc might be
4101 * read-only, in which case this will fail with EROFS. But that's really OK, as in that case we
4102 * can be reasonably sure that no users are going to be added. Note that getpwuid() checks are
4103 * really just an extra safety net. We kinda assume that the UID range we allocate from is
4104 * really ours. */
4105
4106 etc_passwd_lock = take_etc_passwd_lock(NULL);
4107 if (etc_passwd_lock < 0 && etc_passwd_lock != -EROFS)
4108 return log_error_errno(etc_passwd_lock, "Failed to take /etc/passwd lock: %m");
4109 }
4110
4111 r = barrier_create(&barrier);
4112 if (r < 0)
4113 return log_error_errno(r, "Cannot initialize IPC barrier: %m");
4114
4115 if (socketpair(AF_UNIX, SOCK_SEQPACKET|SOCK_CLOEXEC, 0, kmsg_socket_pair) < 0)
4116 return log_error_errno(errno, "Failed to create kmsg socket pair: %m");
4117
4118 if (socketpair(AF_UNIX, SOCK_SEQPACKET|SOCK_CLOEXEC, 0, rtnl_socket_pair) < 0)
4119 return log_error_errno(errno, "Failed to create rtnl socket pair: %m");
4120
4121 if (socketpair(AF_UNIX, SOCK_SEQPACKET|SOCK_CLOEXEC, 0, pid_socket_pair) < 0)
4122 return log_error_errno(errno, "Failed to create pid socket pair: %m");
4123
4124 if (socketpair(AF_UNIX, SOCK_SEQPACKET|SOCK_CLOEXEC, 0, uuid_socket_pair) < 0)
4125 return log_error_errno(errno, "Failed to create id socket pair: %m");
4126
4127 if (socketpair(AF_UNIX, SOCK_SEQPACKET|SOCK_CLOEXEC, 0, notify_socket_pair) < 0)
4128 return log_error_errno(errno, "Failed to create notify socket pair: %m");
4129
3acc84eb
FB		 4130 if (socketpair(AF_UNIX, SOCK_SEQPACKET|SOCK_CLOEXEC, 0, master_pty_socket_pair) < 0)
4131 return log_error_errno(errno, "Failed to create console socket pair: %m");
4132
b0067625
ZJS		 4133 if (arg_userns_mode != USER_NAMESPACE_NO)
4134 if (socketpair(AF_UNIX, SOCK_SEQPACKET|SOCK_CLOEXEC, 0, uid_shift_socket_pair) < 0)
4135 return log_error_errno(errno, "Failed to create uid shift socket pair: %m");
4136
8199d554
LP		 4137 if (arg_unified_cgroup_hierarchy == CGROUP_UNIFIED_UNKNOWN)
4138 if (socketpair(AF_UNIX, SOCK_SEQPACKET|SOCK_CLOEXEC, 0, unified_cgroup_hierarchy_socket_pair) < 0)
4139 return log_error_errno(errno, "Failed to create unified cgroup socket pair: %m");
4140
b0067625
ZJS		 4141 /* Child can be killed before execv(), so handle SIGCHLD in order to interrupt
4142 * parent's blocking calls and give it a chance to call wait() and terminate. */
4143 r = sigprocmask(SIG_UNBLOCK, &mask_chld, NULL);
4144 if (r < 0)
4145 return log_error_errno(errno, "Failed to change the signal mask: %m");
4146
4147 r = sigaction(SIGCHLD, &sa, NULL);
4148 if (r < 0)
4149 return log_error_errno(errno, "Failed to install SIGCHLD handler: %m");
4150
d7bea6b6
DP		 4151 if (arg_network_namespace_path) {
4152 netns_fd = open(arg_network_namespace_path, O_RDONLY|O_NOCTTY|O_CLOEXEC);
4153 if (netns_fd < 0)
4154 return log_error_errno(errno, "Cannot open file %s: %m", arg_network_namespace_path);
4155
4156 r = fd_is_network_ns(netns_fd);
6619ad88
LP		 4157 if (r == -EUCLEAN)
4158 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);
4159 else if (r < 0)
d7bea6b6 4160 return log_error_errno(r, "Failed to check %s fs type: %m", arg_network_namespace_path);
c6147113
LP		 4161 else if (r == 0)
4162 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
4163 "Path %s doesn't refer to a network namespace, refusing.", arg_network_namespace_path);
d7bea6b6
DP		 4164 }
4165
b0067625
ZJS		 4166 *pid = raw_clone(SIGCHLD|CLONE_NEWNS);
4167 if (*pid < 0)
4168 return log_error_errno(errno, "clone() failed%s: %m",
4169 errno == EINVAL ?
4170 ", do you have namespace support enabled in your kernel? (You need UTS, IPC, PID and NET namespacing built in)" : "");
4171
4172 if (*pid == 0) {
4173 /* The outer child only has a file system namespace. */
4174 barrier_set_role(&barrier, BARRIER_CHILD);
4175
b0067625
ZJS		 4176 kmsg_socket_pair[0] = safe_close(kmsg_socket_pair[0]);
4177 rtnl_socket_pair[0] = safe_close(rtnl_socket_pair[0]);
4178 pid_socket_pair[0] = safe_close(pid_socket_pair[0]);
4179 uuid_socket_pair[0] = safe_close(uuid_socket_pair[0]);
4180 notify_socket_pair[0] = safe_close(notify_socket_pair[0]);
3acc84eb 4181 master_pty_socket_pair[0] = safe_close(master_pty_socket_pair[0]);
b0067625 4182 uid_shift_socket_pair[0] = safe_close(uid_shift_socket_pair[0]);
8199d554 4183 unified_cgroup_hierarchy_socket_pair[0] = safe_close(unified_cgroup_hierarchy_socket_pair[0]);
b0067625
ZJS		 4184
4185 (void) reset_all_signal_handlers();
4186 (void) reset_signal_mask();
4187
4188 r = outer_child(&barrier,
4189 arg_directory,
2d845785 4190 dissected_image,
b0067625
ZJS		 4191 secondary,
4192 pid_socket_pair[1],
4193 uuid_socket_pair[1],
4194 notify_socket_pair[1],
4195 kmsg_socket_pair[1],
4196 rtnl_socket_pair[1],
4197 uid_shift_socket_pair[1],
3acc84eb 4198 master_pty_socket_pair[1],
8199d554 4199 unified_cgroup_hierarchy_socket_pair[1],
d7bea6b6
DP		 4200 fds,
4201 netns_fd);
b0067625
ZJS		 4202 if (r < 0)
4203 _exit(EXIT_FAILURE);
4204
4205 _exit(EXIT_SUCCESS);
4206 }
4207
4208 barrier_set_role(&barrier, BARRIER_PARENT);
4209
e4077ff6 4210 fdset_close(fds);
b0067625
ZJS		 4211
4212 kmsg_socket_pair[1] = safe_close(kmsg_socket_pair[1]);
4213 rtnl_socket_pair[1] = safe_close(rtnl_socket_pair[1]);
4214 pid_socket_pair[1] = safe_close(pid_socket_pair[1]);
4215 uuid_socket_pair[1] = safe_close(uuid_socket_pair[1]);
4216 notify_socket_pair[1] = safe_close(notify_socket_pair[1]);
3acc84eb 4217 master_pty_socket_pair[1] = safe_close(master_pty_socket_pair[1]);
b0067625 4218 uid_shift_socket_pair[1] = safe_close(uid_shift_socket_pair[1]);
8199d554 4219 unified_cgroup_hierarchy_socket_pair[1] = safe_close(unified_cgroup_hierarchy_socket_pair[1]);
b0067625
ZJS		 4220
4221 if (arg_userns_mode != USER_NAMESPACE_NO) {
4222 /* The child just let us know the UID shift it might have read from the image. */
4223 l = recv(uid_shift_socket_pair[0], &arg_uid_shift, sizeof arg_uid_shift, 0);
4224 if (l < 0)
4225 return log_error_errno(errno, "Failed to read UID shift: %m");
c6147113
LP		 4226 if (l != sizeof arg_uid_shift)
4227 return log_error_errno(SYNTHETIC_ERRNO(EIO), "Short read while reading UID shift.");
b0067625
ZJS		 4228
4229 if (arg_userns_mode == USER_NAMESPACE_PICK) {
4230 /* If we are supposed to pick the UID shift, let's try to use the shift read from the
4231 * image, but if that's already in use, pick a new one, and report back to the child,
4232 * which one we now picked. */
4233
4234 r = uid_shift_pick(&arg_uid_shift, &uid_shift_lock);
4235 if (r < 0)
4236 return log_error_errno(r, "Failed to pick suitable UID/GID range: %m");
4237
4238 l = send(uid_shift_socket_pair[0], &arg_uid_shift, sizeof arg_uid_shift, MSG_NOSIGNAL);
4239 if (l < 0)
4240 return log_error_errno(errno, "Failed to send UID shift: %m");
c6147113
LP		 4241 if (l != sizeof arg_uid_shift)
4242 return log_error_errno(SYNTHETIC_ERRNO(EIO), "Short write while writing UID shift.");
b0067625
ZJS		 4243 }
4244 }
4245
8199d554
LP		 4246 if (arg_unified_cgroup_hierarchy == CGROUP_UNIFIED_UNKNOWN) {
4247 /* The child let us know the support cgroup mode it might have read from the image. */
4248 l = recv(unified_cgroup_hierarchy_socket_pair[0], &arg_unified_cgroup_hierarchy, sizeof(arg_unified_cgroup_hierarchy), 0);
4249 if (l < 0)
4250 return log_error_errno(errno, "Failed to read cgroup mode: %m");
c6147113
LP		 4251 if (l != sizeof(arg_unified_cgroup_hierarchy))
4252 return log_error_errno(SYNTHETIC_ERRNO(EIO), "Short read while reading cgroup mode (%zu bytes).%s",
4253 l, l == 0 ? " The child is most likely dead." : "");
8199d554
LP		 4254 }
4255
b0067625 4256 /* Wait for the outer child. */
d2e0ac3d
LP		 4257 r = wait_for_terminate_and_check("(sd-namespace)", *pid, WAIT_LOG_ABNORMAL);
4258 if (r < 0)
4259 return r;
4260 if (r != EXIT_SUCCESS)
4261 return -EIO;
b0067625
ZJS		 4262
4263 /* And now retrieve the PID of the inner child. */
4264 l = recv(pid_socket_pair[0], pid, sizeof *pid, 0);
4265 if (l < 0)
4266 return log_error_errno(errno, "Failed to read inner child PID: %m");
c6147113
LP		 4267 if (l != sizeof *pid)
4268 return log_error_errno(SYNTHETIC_ERRNO(EIO), "Short read while reading inner child PID.");
b0067625
ZJS		 4269
4270 /* We also retrieve container UUID in case it was generated by outer child */
4271 l = recv(uuid_socket_pair[0], &arg_uuid, sizeof arg_uuid, 0);
4272 if (l < 0)
4273 return log_error_errno(errno, "Failed to read container machine ID: %m");
c6147113
LP		 4274 if (l != sizeof(arg_uuid))
4275 return log_error_errno(SYNTHETIC_ERRNO(EIO), "Short read while reading container machined ID.");
b0067625
ZJS		 4276
4277 /* We also retrieve the socket used for notifications generated by outer child */
4278 notify_socket = receive_one_fd(notify_socket_pair[0], 0);
4279 if (notify_socket < 0)
4280 return log_error_errno(notify_socket,
4281 "Failed to receive notification socket from the outer child: %m");
4282
4283 log_debug("Init process invoked as PID "PID_FMT, *pid);
4284
4285 if (arg_userns_mode != USER_NAMESPACE_NO) {
c6147113
LP		 4286 if (!barrier_place_and_sync(&barrier)) /* #1 */
4287 return log_error_errno(SYNTHETIC_ERRNO(ESRCH), "Child died too early.");
b0067625
ZJS		 4288
4289 r = setup_uid_map(*pid);
4290 if (r < 0)
4291 return r;
4292
4293 (void) barrier_place(&barrier); /* #2 */
4294 }
4295
4296 if (arg_private_network) {
75116558
PS		 4297 if (!arg_network_namespace_path) {
4298 /* Wait until the child has unshared its network namespace. */
c6147113
LP		 4299 if (!barrier_place_and_sync(&barrier)) /* #3 */
4300 return log_error_errno(SYNTHETIC_ERRNO(ESRCH), "Child died too early");
75116558
PS		 4301 }
4302
b0067625
ZJS		 4303 r = move_network_interfaces(*pid, arg_network_interfaces);
4304 if (r < 0)
4305 return r;
4306
4307 if (arg_network_veth) {
4308 r = setup_veth(arg_machine, *pid, veth_name,
4309 arg_network_bridge || arg_network_zone);
4310 if (r < 0)
4311 return r;
4312 else if (r > 0)
4313 ifi = r;
4314
4315 if (arg_network_bridge) {
4316 /* Add the interface to a bridge */
4317 r = setup_bridge(veth_name, arg_network_bridge, false);
4318 if (r < 0)
4319 return r;
4320 if (r > 0)
4321 ifi = r;
4322 } else if (arg_network_zone) {
4323 /* Add the interface to a bridge, possibly creating it */
4324 r = setup_bridge(veth_name, arg_network_zone, true);
4325 if (r < 0)
4326 return r;
4327 if (r > 0)
4328 ifi = r;
4329 }
4330 }
4331
4332 r = setup_veth_extra(arg_machine, *pid, arg_network_veth_extra);
4333 if (r < 0)
4334 return r;
4335
4336 /* We created the primary and extra veth links now; let's remember this, so that we know to
4337 remove them later on. Note that we don't bother with removing veth links that were created
4338 here when their setup failed half-way, because in that case the kernel should be able to
4339 remove them on its own, since they cannot be referenced by anything yet. */
4340 *veth_created = true;
4341
4342 r = setup_macvlan(arg_machine, *pid, arg_network_macvlan);
4343 if (r < 0)
4344 return r;
4345
4346 r = setup_ipvlan(arg_machine, *pid, arg_network_ipvlan);
4347 if (r < 0)
4348 return r;
4349 }
4350
abdb9b08
LP		 4351 if (arg_register || !arg_keep_unit) {
4352 r = sd_bus_default_system(&bus);
4353 if (r < 0)
4354 return log_error_errno(r, "Failed to open system bus: %m");
e5a2d8b5
LP		 4355
4356 r = sd_bus_set_close_on_exit(bus, false);
4357 if (r < 0)
4358 return log_error_errno(r, "Failed to disable close-on-exit behaviour: %m");
abdb9b08
LP		 4359 }
4360
4361 if (!arg_keep_unit) {
4362 /* When a new scope is created for this container, then we'll be registered as its controller, in which
4363 * case PID 1 will send us a friendly RequestStop signal, when it is asked to terminate the
4364 * scope. Let's hook into that, and cleanly shut down the container, and print a friendly message. */
4365
75152a4d
LP		 4366 r = sd_bus_match_signal_async(
4367 bus,
4368 NULL,
4369 "org.freedesktop.systemd1",
4370 NULL,
4371 "org.freedesktop.systemd1.Scope",
4372 "RequestStop",
4373 on_request_stop, NULL, PID_TO_PTR(*pid));
abdb9b08 4374 if (r < 0)
75152a4d 4375 return log_error_errno(r, "Failed to request RequestStop match: %m");
abdb9b08
LP		 4376 }
4377
b0067625
ZJS		 4378 if (arg_register) {
4379 r = register_machine(
abdb9b08 4380 bus,
b0067625
ZJS		 4381 arg_machine,
4382 *pid,
4383 arg_directory,
4384 arg_uuid,
4385 ifi,
4386 arg_slice,
4387 arg_custom_mounts, arg_n_custom_mounts,
4388 arg_kill_signal,
4389 arg_property,
de40a303 4390 arg_property_message,
b0067625
ZJS		 4391 arg_keep_unit,
4392 arg_container_service_name);
4393 if (r < 0)
4394 return r;
abdb9b08 4395
cd2dfc6f
LP		 4396 } else if (!arg_keep_unit) {
4397 r = allocate_scope(
abdb9b08 4398 bus,
cd2dfc6f
LP		 4399 arg_machine,
4400 *pid,
4401 arg_slice,
4402 arg_custom_mounts, arg_n_custom_mounts,
4403 arg_kill_signal,
de40a303
LP		 4404 arg_property,
4405 arg_property_message);
cd2dfc6f
LP		 4406 if (r < 0)
4407 return r;
4408
4409 } else if (arg_slice || arg_property)
4410 log_notice("Machine and scope registration turned off, --slice= and --property= settings will have no effect.");
b0067625 4411
27da7ef0 4412 r = create_subcgroup(*pid, arg_keep_unit, arg_unified_cgroup_hierarchy);
b0067625
ZJS		 4413 if (r < 0)
4414 return r;
4415
27da7ef0 4416 r = sync_cgroup(*pid, arg_unified_cgroup_hierarchy, arg_uid_shift);
720f0a2f
LP		 4417 if (r < 0)
4418 return r;
b0067625 4419
de54e02d 4420 r = chown_cgroup(*pid, arg_unified_cgroup_hierarchy, arg_uid_shift);
b0067625
ZJS		 4421 if (r < 0)
4422 return r;
4423
4424 /* Notify the child that the parent is ready with all
4425 * its setup (including cgroup-ification), and that
4426 * the child can now hand over control to the code to
4427 * run inside the container. */
75116558 4428 (void) barrier_place(&barrier); /* #4 */
b0067625
ZJS		 4429
4430 /* Block SIGCHLD here, before notifying child.
4431 * process_pty() will handle it with the other signals. */
4432 assert_se(sigprocmask(SIG_BLOCK, &mask_chld, NULL) >= 0);
4433
4434 /* Reset signal to default */
4435 r = default_signals(SIGCHLD, -1);
4436 if (r < 0)
4437 return log_error_errno(r, "Failed to reset SIGCHLD: %m");
4438
4439 r = sd_event_new(&event);
4440 if (r < 0)
4441 return log_error_errno(r, "Failed to get default event source: %m");
4442
8fd010bb
LP		 4443 (void) sd_event_set_watchdog(event, true);
4444
abdb9b08
LP		 4445 if (bus) {
4446 r = sd_bus_attach_event(bus, event, 0);
4447 if (r < 0)
4448 return log_error_errno(r, "Failed to attach bus to event loop: %m");
4449 }
4450
5773024d 4451 r = setup_sd_notify_parent(event, notify_socket, PID_TO_PTR(*pid), &notify_event_source);
b0067625
ZJS		 4452 if (r < 0)
4453 return r;
4454
4455 /* Let the child know that we are ready and wait that the child is completely ready now. */
c6147113
LP		 4456 if (!barrier_place_and_sync(&barrier)) /* #5 */
4457 return log_error_errno(SYNTHETIC_ERRNO(ESRCH), "Child died too early.");
b0067625
ZJS		 4458
4459 /* At this point we have made use of the UID we picked, and thus nss-mymachines
4460 * will make them appear in getpwuid(), thus we can release the /etc/passwd lock. */
4461 etc_passwd_lock = safe_close(etc_passwd_lock);
4462
04f590a4
LP		 4463 (void) sd_notifyf(false,
4464 "STATUS=Container running.\n"
4465 "X_NSPAWN_LEADER_PID=" PID_FMT, *pid);
b0067625 4466 if (!arg_notify_ready)
919f5ae0 4467 (void) sd_notify(false, "READY=1\n");
b0067625
ZJS		 4468
4469 if (arg_kill_signal > 0) {
4470 /* Try to kill the init system on SIGINT or SIGTERM */
919f5ae0
LP		 4471 (void) sd_event_add_signal(event, NULL, SIGINT, on_orderly_shutdown, PID_TO_PTR(*pid));
4472 (void) sd_event_add_signal(event, NULL, SIGTERM, on_orderly_shutdown, PID_TO_PTR(*pid));
b0067625
ZJS		 4473 } else {
4474 /* Immediately exit */
919f5ae0
LP		 4475 (void) sd_event_add_signal(event, NULL, SIGINT, NULL, NULL);
4476 (void) sd_event_add_signal(event, NULL, SIGTERM, NULL, NULL);
b0067625
ZJS		 4477 }
4478
6916b164 4479 /* Exit when the child exits */
919f5ae0 4480 (void) sd_event_add_signal(event, NULL, SIGCHLD, on_sigchld, PID_TO_PTR(*pid));
b0067625
ZJS		 4481
4482 if (arg_expose_ports) {
4483 r = expose_port_watch_rtnl(event, rtnl_socket_pair[0], on_address_change, exposed, &rtnl);
4484 if (r < 0)
4485 return r;
4486
4487 (void) expose_port_execute(rtnl, arg_expose_ports, exposed);
4488 }
4489
4490 rtnl_socket_pair[0] = safe_close(rtnl_socket_pair[0]);
4491
3acc84eb
FB		 4492 if (arg_console_mode != CONSOLE_PIPE) {
4493 _cleanup_close_ int fd = -1;
4494 PTYForwardFlags flags = 0;
de40a303 4495
3acc84eb
FB		 4496 /* Retrieve the master pty allocated by inner child */
4497 fd = receive_one_fd(master_pty_socket_pair[0], 0);
4498 if (fd < 0)
4499 return log_error_errno(fd, "Failed to receive master pty from the inner child: %m");
4500
4501 switch (arg_console_mode) {
de40a303 4502
3acc84eb
FB		 4503 case CONSOLE_READ_ONLY:
4504 flags |= PTY_FORWARD_READ_ONLY;
4505
4506 _fallthrough_;
4507
4508 case CONSOLE_INTERACTIVE:
4509 flags |= PTY_FORWARD_IGNORE_VHANGUP;
4510
4511 r = pty_forward_new(event, fd, flags, &forward);
4512 if (r < 0)
4513 return log_error_errno(r, "Failed to create PTY forwarder: %m");
4514
4515 if (arg_console_width != (unsigned) -1 || arg_console_height != (unsigned) -1)
4516 (void) pty_forward_set_width_height(forward,
4517 arg_console_width,
4518 arg_console_height);
4519 break;
4520
4521 default:
4522 assert(arg_console_mode == CONSOLE_PASSIVE);
4523 }
4524
4525 *master = TAKE_FD(fd);
de40a303 4526 }
b0067625
ZJS		 4527
4528 r = sd_event_loop(event);
4529 if (r < 0)
4530 return log_error_errno(r, "Failed to run event loop: %m");
4531
de40a303
LP		 4532 if (forward) {
4533 char last_char = 0;
b0067625 4534
de40a303
LP		 4535 (void) pty_forward_get_last_char(forward, &last_char);
4536 forward = pty_forward_free(forward);
b0067625 4537
de40a303
LP		 4538 if (!arg_quiet && last_char != '\n')
4539 putc('\n', stdout);
4540 }
b0067625
ZJS		 4541
4542 /* Kill if it is not dead yet anyway */
1d78fea2
LP		 4543 if (bus) {
4544 if (arg_register)
4545 terminate_machine(bus, arg_machine);
4546 else if (!arg_keep_unit)
4547 terminate_scope(bus, arg_machine);
4548 }
b0067625
ZJS		 4549
4550 /* Normally redundant, but better safe than sorry */
c67b0082 4551 (void) kill(*pid, SIGKILL);
b0067625
ZJS		 4552
4553 r = wait_for_container(*pid, &container_status);
4554 *pid = 0;
4555
4556 if (r < 0)
4557 /* We failed to wait for the container, or the container exited abnormally. */
4558 return r;
4559 if (r > 0 || container_status == CONTAINER_TERMINATED) {
27e29a1e
ZJS		 4560 /* r > 0 → The container exited with a non-zero status.
4561 * As a special case, we need to replace 133 with a different value,
4562 * because 133 is special-cased in the service file to reboot the container.
4563 * otherwise → The container exited with zero status and a reboot was not requested.
4564 */
2a49b612 4565 if (r == EXIT_FORCE_RESTART)
27e29a1e 4566 r = EXIT_FAILURE; /* replace 133 with the general failure code */
b0067625 4567 *ret = r;
b0067625
ZJS		 4568 return 0; /* finito */
4569 }
4570
4571 /* CONTAINER_REBOOTED, loop again */
4572
4573 if (arg_keep_unit) {
4574 /* Special handling if we are running as a service: instead of simply
4575 * restarting the machine we want to restart the entire service, so let's
4576 * inform systemd about this with the special exit code 133. The service
4577 * file uses RestartForceExitStatus=133 so that this results in a full
4578 * nspawn restart. This is necessary since we might have cgroup parameters
4579 * set we want to have flushed out. */
2a49b612
ZJS		 4580 *ret = EXIT_FORCE_RESTART;
4581 return 0; /* finito */
b0067625
ZJS		 4582 }
4583
4584 expose_port_flush(arg_expose_ports, exposed);
4585
4586 (void) remove_veth_links(veth_name, arg_network_veth_extra);
4587 *veth_created = false;
4588 return 1; /* loop again */
4589}
4590
bf428efb 4591static int initialize_rlimits(void) {
bf428efb
LP		 4592 /* The default resource limits the kernel passes to PID 1, as per kernel 4.16. Let's pass our container payload
4593 * the same values as the kernel originally passed to PID 1, in order to minimize differences between host and
4594 * container execution environments. */
4595
4596 static const struct rlimit kernel_defaults[_RLIMIT_MAX] = {
4597 [RLIMIT_AS] = { RLIM_INFINITY, RLIM_INFINITY },
4598 [RLIMIT_CORE] = { 0, RLIM_INFINITY },
4599 [RLIMIT_CPU] = { RLIM_INFINITY, RLIM_INFINITY },
4600 [RLIMIT_DATA] = { RLIM_INFINITY, RLIM_INFINITY },
4601 [RLIMIT_FSIZE] = { RLIM_INFINITY, RLIM_INFINITY },
4602 [RLIMIT_LOCKS] = { RLIM_INFINITY, RLIM_INFINITY },
4603 [RLIMIT_MEMLOCK] = { 65536, 65536 },
4604 [RLIMIT_MSGQUEUE] = { 819200, 819200 },
4605 [RLIMIT_NICE] = { 0, 0 },
4606 [RLIMIT_NOFILE] = { 1024, 4096 },
4607 [RLIMIT_RSS] = { RLIM_INFINITY, RLIM_INFINITY },
4608 [RLIMIT_RTPRIO] = { 0, 0 },
4609 [RLIMIT_RTTIME] = { RLIM_INFINITY, RLIM_INFINITY },
4610 [RLIMIT_STACK] = { 8388608, RLIM_INFINITY },
4611
4612 /* The kernel scales the default for RLIMIT_NPROC and RLIMIT_SIGPENDING based on the system's amount of
4613 * RAM. To provide best compatibility we'll read these limits off PID 1 instead of hardcoding them
4614 * here. This is safe as we know that PID 1 doesn't change these two limits and thus the original
4615 * kernel's initialization should still be valid during runtime — at least if PID 1 is systemd. Note
4616 * that PID 1 changes a number of other resource limits during early initialization which is why we
4617 * don't read the other limits from PID 1 but prefer the static table above. */
4618 };
4619
4620 int rl;
4621
4622 for (rl = 0; rl < _RLIMIT_MAX; rl++) {
bf428efb
LP		 4623 /* Let's only fill in what the user hasn't explicitly configured anyway */
4624 if ((arg_settings_mask & (SETTING_RLIMIT_FIRST << rl)) == 0) {
4625 const struct rlimit *v;
4626 struct rlimit buffer;
4627
4628 if (IN_SET(rl, RLIMIT_NPROC, RLIMIT_SIGPENDING)) {
4629 /* For these two let's read the limits off PID 1. See above for an explanation. */
4630
4631 if (prlimit(1, rl, NULL, &buffer) < 0)
4632 return log_error_errno(errno, "Failed to read resource limit RLIMIT_%s of PID 1: %m", rlimit_to_string(rl));
4633
4634 v = &buffer;
4635 } else
4636 v = kernel_defaults + rl;
4637
4638 arg_rlimit[rl] = newdup(struct rlimit, v, 1);
4639 if (!arg_rlimit[rl])
4640 return log_oom();
4641 }
4642
4643 if (DEBUG_LOGGING) {
4644 _cleanup_free_ char *k = NULL;
4645
4646 (void) rlimit_format(arg_rlimit[rl], &k);
4647 log_debug("Setting RLIMIT_%s to %s.", rlimit_to_string(rl), k);
4648 }
4649 }
4650
4651 return 0;
4652}
4653
44dbef90 4654static int run(int argc, char *argv[]) {
2d845785 4655 _cleanup_close_ int master = -1;
03cfe0d5 4656 _cleanup_fdset_free_ FDSet *fds = NULL;
2d845785 4657 int r, n_fd_passed, ret = EXIT_SUCCESS;
5aa3eba5 4658 char veth_name[IFNAMSIZ] = "";
17cbb288 4659 bool secondary = false, remove_directory = false, remove_image = false;
03cfe0d5 4660 pid_t pid = 0;
03cfe0d5 4661 union in_addr_union exposed = {};
8e766630 4662 _cleanup_(release_lock_file) LockFile tree_global_lock = LOCK_FILE_INIT, tree_local_lock = LOCK_FILE_INIT;
de40a303 4663 bool veth_created = false, remove_tmprootdir = false;
c67b0082 4664 char tmprootdir[] = "/tmp/nspawn-root-XXXXXX";
2d845785 4665 _cleanup_(loop_device_unrefp) LoopDevice *loop = NULL;
18b5886e
LP		 4666 _cleanup_(decrypted_image_unrefp) DecryptedImage *decrypted_image = NULL;
4667 _cleanup_(dissected_image_unrefp) DissectedImage *dissected_image = NULL;
03cfe0d5
LP		 4668
4669 log_parse_environment();
4670 log_open();
415fc41c 4671
03cfe0d5
LP		 4672 r = parse_argv(argc, argv);
4673 if (r <= 0)
4674 goto finish;
4675
fba868fa
LP		 4676 r = must_be_root();
4677 if (r < 0)
03cfe0d5 4678 goto finish;
fba868fa 4679
bf428efb
LP		 4680 r = initialize_rlimits();
4681 if (r < 0)
4682 goto finish;
4683
de40a303
LP		 4684 r = load_oci_bundle();
4685 if (r < 0)
4686 goto finish;
4687
f757855e
LP		 4688 r = determine_names();
4689 if (r < 0)
4690 goto finish;
4691
4692 r = load_settings();
4693 if (r < 0)
4694 goto finish;
4695
5eee8290
LP		 4696 r = cg_unified_flush();
4697 if (r < 0) {
4698 log_error_errno(r, "Failed to determine whether the unified cgroups hierarchy is used: %m");
4699 goto finish;
4700 }
4701
f757855e
LP		 4702 r = verify_arguments();
4703 if (r < 0)
4704 goto finish;
03cfe0d5 4705
8199d554
LP		 4706 r = detect_unified_cgroup_hierarchy_from_environment();
4707 if (r < 0)
4708 goto finish;
4709
2949ff26
LP		 4710 /* Ignore SIGPIPE here, because we use splice() on the ptyfwd stuff and that will generate SIGPIPE if
4711 * the result is closed. Note that the container payload child will reset signal mask+handler anyway,
4712 * so just turning this off here means we only turn it off in nspawn itself, not any children. */
4713 (void) ignore_signals(SIGPIPE, -1);
4714
03cfe0d5
LP		 4715 n_fd_passed = sd_listen_fds(false);
4716 if (n_fd_passed > 0) {
4717 r = fdset_new_listen_fds(&fds, false);
4718 if (r < 0) {
4719 log_error_errno(r, "Failed to collect file descriptors: %m");
4720 goto finish;
4721 }
4722 }
4723
83e803a9
ZJS		 4724 /* The "default" umask. This is appropriate for most file and directory
4725 * operations performed by nspawn, and is the umask that will be used for
4726 * the child. Functions like copy_devnodes() change the umask temporarily. */
4727 umask(0022);
4728
03cfe0d5
LP		 4729 if (arg_directory) {
4730 assert(!arg_image);
4731
4732 if (path_equal(arg_directory, "/") && !arg_ephemeral) {
4733 log_error("Spawning container on root directory is not supported. Consider using --ephemeral.");
4734 r = -EINVAL;
4735 goto finish;
4736 }
4737
4738 if (arg_ephemeral) {
4739 _cleanup_free_ char *np = NULL;
4740
8d4aa2bb 4741 r = chase_symlinks_and_update(&arg_directory, 0);
3f342ec4
LP		 4742 if (r < 0)
4743 goto finish;
4744
03cfe0d5
LP		 4745 /* If the specified path is a mount point we
4746 * generate the new snapshot immediately
4747 * inside it under a random name. However if
4748 * the specified is not a mount point we
4749 * create the new snapshot in the parent
4750 * directory, just next to it. */
e1873695 4751 r = path_is_mount_point(arg_directory, NULL, 0);
03cfe0d5
LP		 4752 if (r < 0) {
4753 log_error_errno(r, "Failed to determine whether directory %s is mount point: %m", arg_directory);
4754 goto finish;
4755 }
4756 if (r > 0)
770b5ce4 4757 r = tempfn_random_child(arg_directory, "machine.", &np);
03cfe0d5 4758 else
770b5ce4 4759 r = tempfn_random(arg_directory, "machine.", &np);
03cfe0d5 4760 if (r < 0) {
0f3be6ca 4761 log_error_errno(r, "Failed to generate name for directory snapshot: %m");
03cfe0d5
LP		 4762 goto finish;
4763 }
4764
4765 r = image_path_lock(np, (arg_read_only ? LOCK_SH : LOCK_EX) | LOCK_NB, &tree_global_lock, &tree_local_lock);
4766 if (r < 0) {
4767 log_error_errno(r, "Failed to lock %s: %m", np);
4768 goto finish;
4769 }
4770
17cbb288
LP		 4771 r = btrfs_subvol_snapshot(arg_directory, np,
4772 (arg_read_only ? BTRFS_SNAPSHOT_READ_ONLY : 0) |
4773 BTRFS_SNAPSHOT_FALLBACK_COPY |
4774 BTRFS_SNAPSHOT_FALLBACK_DIRECTORY |
4775 BTRFS_SNAPSHOT_RECURSIVE |
4776 BTRFS_SNAPSHOT_QUOTA);
03cfe0d5
LP		 4777 if (r < 0) {
4778 log_error_errno(r, "Failed to create snapshot %s from %s: %m", np, arg_directory);
4779 goto finish;
ec16945e
LP		 4780 }
4781
1cc6c93a 4782 free_and_replace(arg_directory, np);
ec16945e 4783
17cbb288 4784 remove_directory = true;
30535c16
LP		 4785
4786 } else {
cb638b5e 4787 r = chase_symlinks_and_update(&arg_directory, arg_template ? CHASE_NONEXISTENT : 0);
8d4aa2bb
LP		 4788 if (r < 0)
4789 goto finish;
4790
30535c16
LP		 4791 r = image_path_lock(arg_directory, (arg_read_only ? LOCK_SH : LOCK_EX) | LOCK_NB, &tree_global_lock, &tree_local_lock);
4792 if (r == -EBUSY) {
4793 log_error_errno(r, "Directory tree %s is currently busy.", arg_directory);
4794 goto finish;
4795 }
4796 if (r < 0) {
4797 log_error_errno(r, "Failed to lock %s: %m", arg_directory);
476b8254 4798 goto finish;
30535c16
LP		 4799 }
4800
4801 if (arg_template) {
8d4aa2bb 4802 r = chase_symlinks_and_update(&arg_template, 0);
3f342ec4
LP		 4803 if (r < 0)
4804 goto finish;
4805
17cbb288
LP		 4806 r = btrfs_subvol_snapshot(arg_template, arg_directory,
4807 (arg_read_only ? BTRFS_SNAPSHOT_READ_ONLY : 0) |
4808 BTRFS_SNAPSHOT_FALLBACK_COPY |
4809 BTRFS_SNAPSHOT_FALLBACK_DIRECTORY |
4810 BTRFS_SNAPSHOT_FALLBACK_IMMUTABLE |
4811 BTRFS_SNAPSHOT_RECURSIVE |
4812 BTRFS_SNAPSHOT_QUOTA);
ff6c6cc1
LP		 4813 if (r == -EEXIST)
4814 log_full(arg_quiet ? LOG_DEBUG : LOG_INFO,
4815 "Directory %s already exists, not populating from template %s.", arg_directory, arg_template);
4816 else if (r < 0) {
83521414 4817 log_error_errno(r, "Couldn't create snapshot %s from %s: %m", arg_directory, arg_template);
30535c16 4818 goto finish;
ff6c6cc1
LP		 4819 } else
4820 log_full(arg_quiet ? LOG_DEBUG : LOG_INFO,
4821 "Populated %s from template %s.", arg_directory, arg_template);
30535c16 4822 }
ec16945e
LP		 4823 }
4824
7732f92b 4825 if (arg_start_mode == START_BOOT) {
a5201ed6 4826 const char *p;
c9fe05e0 4827
a5201ed6
LP		 4828 if (arg_pivot_root_new)
4829 p = prefix_roota(arg_directory, arg_pivot_root_new);
4830 else
4831 p = arg_directory;
c9fe05e0
AR		 4832
4833 if (path_is_os_tree(p) <= 0) {
4834 log_error("Directory %s doesn't look like an OS root directory (os-release file is missing). Refusing.", p);
ec16945e 4835 r = -EINVAL;
1b9e5b12
LP		 4836 goto finish;
4837 }
4838 } else {
c9fe05e0
AR		 4839 const char *p, *q;
4840
a5201ed6
LP		 4841 if (arg_pivot_root_new)
4842 p = prefix_roota(arg_directory, arg_pivot_root_new);
4843 else
4844 p = arg_directory;
c9fe05e0
AR		 4845
4846 q = strjoina(p, "/usr/");
1b9e5b12 4847
c9fe05e0
AR		 4848 if (laccess(q, F_OK) < 0) {
4849 log_error("Directory %s doesn't look like it has an OS tree. Refusing.", p);
ec16945e 4850 r = -EINVAL;
1b9e5b12 4851 goto finish;
1b9e5b12
LP		 4852 }
4853 }
ec16945e 4854
6b9132a9 4855 } else {
ec16945e
LP		 4856 assert(arg_image);
4857 assert(!arg_template);
4858
8d4aa2bb 4859 r = chase_symlinks_and_update(&arg_image, 0);
3f342ec4
LP		 4860 if (r < 0)
4861 goto finish;
4862
0f3be6ca
LP		 4863 if (arg_ephemeral) {
4864 _cleanup_free_ char *np = NULL;
4865
4866 r = tempfn_random(arg_image, "machine.", &np);
4867 if (r < 0) {
4868 log_error_errno(r, "Failed to generate name for image snapshot: %m");
4869 goto finish;
4870 }
4871
4872 r = image_path_lock(np, (arg_read_only ? LOCK_SH : LOCK_EX) | LOCK_NB, &tree_global_lock, &tree_local_lock);
4873 if (r < 0) {
4874 r = log_error_errno(r, "Failed to create image lock: %m");
4875 goto finish;
4876 }
4877
8a016c74 4878 r = copy_file(arg_image, np, O_EXCL, arg_read_only ? 0400 : 0600, FS_NOCOW_FL, FS_NOCOW_FL, COPY_REFLINK|COPY_CRTIME);
0f3be6ca
LP		 4879 if (r < 0) {
4880 r = log_error_errno(r, "Failed to copy image file: %m");
4881 goto finish;
4882 }
4883
1cc6c93a 4884 free_and_replace(arg_image, np);
0f3be6ca
LP		 4885
4886 remove_image = true;
4887 } else {
4888 r = image_path_lock(arg_image, (arg_read_only ? LOCK_SH : LOCK_EX) | LOCK_NB, &tree_global_lock, &tree_local_lock);
4889 if (r == -EBUSY) {
4890 r = log_error_errno(r, "Disk image %s is currently busy.", arg_image);
4891 goto finish;
4892 }
4893 if (r < 0) {
4894 r = log_error_errno(r, "Failed to create image lock: %m");
4895 goto finish;
4896 }
4623e8e6 4897
78ebe980
LP		 4898 if (!arg_root_hash) {
4899 r = root_hash_load(arg_image, &arg_root_hash, &arg_root_hash_size);
4900 if (r < 0) {
4901 log_error_errno(r, "Failed to load root hash file for %s: %m", arg_image);
4902 goto finish;
4903 }
4904 }
30535c16
LP		 4905 }
4906
c67b0082 4907 if (!mkdtemp(tmprootdir)) {
0f3be6ca 4908 r = log_error_errno(errno, "Failed to create temporary directory: %m");
6b9132a9 4909 goto finish;
1b9e5b12 4910 }
6b9132a9 4911
c67b0082
LP		 4912 remove_tmprootdir = true;
4913
4914 arg_directory = strdup(tmprootdir);
1b9e5b12
LP		 4915 if (!arg_directory) {
4916 r = log_oom();
4917 goto finish;
6b9132a9 4918 }
88213476 4919
2d845785
LP		 4920 r = loop_device_make_by_path(arg_image, arg_read_only ? O_RDONLY : O_RDWR, &loop);
4921 if (r < 0) {
4922 log_error_errno(r, "Failed to set up loopback block device: %m");
842f3b0f
LP		 4923 goto finish;
4924 }
1b9e5b12 4925
4526113f 4926 r = dissect_image_and_warn(
e0f9e7bd 4927 loop->fd,
4526113f 4928 arg_image,
e0f9e7bd
LP		 4929 arg_root_hash, arg_root_hash_size,
4930 DISSECT_IMAGE_REQUIRE_ROOT,
4931 &dissected_image);
2d845785 4932 if (r == -ENOPKG) {
4526113f 4933 /* dissected_image_and_warn() already printed a brief error message. Extend on that with more details */
2d845785
LP		 4934 log_notice("Note that the disk image needs to\n"
4935 " a) either contain only a single MBR partition of type 0x83 that is marked bootable\n"
4936 " b) or contain a single GPT partition of type 0FC63DAF-8483-4772-8E79-3D69D8477DE4\n"
4937 " c) or follow http://www.freedesktop.org/wiki/Specifications/DiscoverablePartitionsSpec/\n"
4938 " d) or contain a file system without a partition table\n"
4939 "in order to be bootable with systemd-nspawn.");
1b9e5b12 4940 goto finish;
2d845785 4941 }
4526113f 4942 if (r < 0)
842f3b0f 4943 goto finish;
1b9e5b12 4944
4623e8e6
LP		 4945 if (!arg_root_hash && dissected_image->can_verity)
4946 log_notice("Note: image %s contains verity information, but no root hash specified! Proceeding without integrity checking.", arg_image);
4947
4948 r = dissected_image_decrypt_interactively(dissected_image, NULL, arg_root_hash, arg_root_hash_size, 0, &decrypted_image);
1b9e5b12
LP		 4949 if (r < 0)
4950 goto finish;
0f3be6ca
LP		 4951
4952 /* Now that we mounted the image, let's try to remove it again, if it is ephemeral */
4953 if (remove_image && unlink(arg_image) >= 0)
4954 remove_image = false;
842f3b0f 4955 }
842f3b0f 4956
86c0dd4a 4957 r = custom_mount_prepare_all(arg_directory, arg_custom_mounts, arg_n_custom_mounts);
5a8af538
LP		 4958 if (r < 0)
4959 goto finish;
4960
de40a303
LP		 4961 if (arg_console_mode < 0)
4962 arg_console_mode =
4963 isatty(STDIN_FILENO) > 0 &&
4964 isatty(STDOUT_FILENO) > 0 ? CONSOLE_INTERACTIVE : CONSOLE_READ_ONLY;
9c857b9d 4965
de40a303
LP		 4966 if (arg_console_mode == CONSOLE_PIPE) /* if we pass STDERR on to the container, don't add our own logs into it too */
4967 arg_quiet = true;
a258bf26 4968
9c857b9d
LP		 4969 if (!arg_quiet)
4970 log_info("Spawning container %s on %s.\nPress ^] three times within 1s to kill container.",
4971 arg_machine, arg_image ?: arg_directory);
4972
72c0a2c2 4973 assert_se(sigprocmask_many(SIG_BLOCK, NULL, SIGCHLD, SIGWINCH, SIGTERM, SIGINT, -1) >= 0);
a258bf26 4974
66edd963 4975 if (prctl(PR_SET_CHILD_SUBREAPER, 1, 0, 0, 0) < 0) {
03cfe0d5
LP		 4976 r = log_error_errno(errno, "Failed to become subreaper: %m");
4977 goto finish;
4978 }
4979
d87be9b0 4980 for (;;) {
3acc84eb 4981 r = run_container(dissected_image,
44dbef90
LP		 4982 secondary,
4983 fds,
4984 veth_name, &veth_created,
3acc84eb 4985 &exposed, &master,
44dbef90 4986 &pid, &ret);
b0067625 4987 if (r <= 0)
d87be9b0 4988 break;
d87be9b0 4989 }
88213476
LP		 4990
4991finish:
04f590a4
LP		 4992 (void) sd_notify(false,
4993 r == 0 && ret == EXIT_FORCE_RESTART ? "STOPPING=1\nSTATUS=Restarting..." :
4994 "STOPPING=1\nSTATUS=Terminating...");
af4ec430 4995
9444b1f2 4996 if (pid > 0)
c67b0082 4997 (void) kill(pid, SIGKILL);
88213476 4998
503546da 4999 /* Try to flush whatever is still queued in the pty */
6a0f896b 5000 if (master >= 0) {
1c876927 5001 (void) copy_bytes(master, STDOUT_FILENO, (uint64_t) -1, 0);
6a0f896b
LP		 5002 master = safe_close(master);
5003 }
5004
5005 if (pid > 0)
5006 (void) wait_for_terminate(pid, NULL);
503546da 5007
50ebcf6c
LP		 5008 pager_close();
5009
17cbb288 5010 if (remove_directory && arg_directory) {
ec16945e
LP		 5011 int k;
5012
17cbb288 5013 k = rm_rf(arg_directory, REMOVE_ROOT|REMOVE_PHYSICAL|REMOVE_SUBVOLUME);
ec16945e 5014 if (k < 0)
17cbb288 5015 log_warning_errno(k, "Cannot remove '%s', ignoring: %m", arg_directory);
ec16945e
LP		 5016 }
5017
0f3be6ca
LP		 5018 if (remove_image && arg_image) {
5019 if (unlink(arg_image) < 0)
5020 log_warning_errno(errno, "Can't remove image file '%s', ignoring: %m", arg_image);
5021 }
5022
c67b0082
LP		 5023 if (remove_tmprootdir) {
5024 if (rmdir(tmprootdir) < 0)
5025 log_debug_errno(errno, "Can't remove temporary root directory '%s', ignoring: %m", tmprootdir);
5026 }
5027
785890ac
LP		 5028 if (arg_machine) {
5029 const char *p;
5030
63c372cb 5031 p = strjoina("/run/systemd/nspawn/propagate/", arg_machine);
c6878637 5032 (void) rm_rf(p, REMOVE_ROOT);
785890ac
LP		 5033 }
5034
7a8f6325 5035 expose_port_flush(arg_expose_ports, &exposed);
7513c5b8
LP		 5036
5037 if (veth_created)
5038 (void) remove_veth_links(veth_name, arg_network_veth_extra);
22b28dfd 5039 (void) remove_bridge(arg_network_zone);
f757855e 5040
f757855e
LP		 5041 custom_mount_free_all(arg_custom_mounts, arg_n_custom_mounts);
5042 expose_port_free_all(arg_expose_ports);
bf428efb 5043 rlimit_free_all(arg_rlimit);
b2645747 5044 device_node_array_free(arg_extra_nodes, arg_n_extra_nodes);
6d0b55c2 5045
44dbef90
LP		 5046 if (r < 0)
5047 return r;
5048
5049 return ret;
88213476 5050}
44dbef90
LP		 5051
5052DEFINE_MAIN_FUNCTION_WITH_POSITIVE_FAILURE(run);
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