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io-util: add new IOVEC_INIT/IOVEC_MAKE macros
[thirdparty/systemd.git] / src / nspawn / nspawn.c
CommitLineData
88213476
LP		 1/***
2 This file is part of systemd.
3
4 Copyright 2010 Lennart Poettering
5
6 systemd is free software; you can redistribute it and/or modify it
5430f7f2
LP		 7 under the terms of the GNU Lesser General Public License as published by
8 the Free Software Foundation; either version 2.1 of the License, or
88213476
LP		 9 (at your option) any later version.
10
11 systemd is distributed in the hope that it will be useful, but
12 WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
5430f7f2 14 Lesser General Public License for more details.
88213476 15
5430f7f2 16 You should have received a copy of the GNU Lesser General Public License
88213476
LP		 17 along with systemd; If not, see <http://www.gnu.org/licenses/>.
18***/
19
8fe0087e 20#ifdef HAVE_BLKID
6b5cf3ea 21#include <blkid.h>
8fe0087e 22#endif
88213476 23#include <errno.h>
88213476 24#include <getopt.h>
0e7ac751 25#include <grp.h>
1b9e5b12 26#include <linux/loop.h>
0e7ac751 27#include <pwd.h>
8fe0087e 28#include <sched.h>
8fe0087e
LP		 29#ifdef HAVE_SELINUX
30#include <selinux/selinux.h>
1b9e5b12 31#endif
8fe0087e
LP		 32#include <signal.h>
33#include <stdio.h>
34#include <stdlib.h>
35#include <string.h>
36#include <sys/file.h>
37#include <sys/mount.h>
38#include <sys/personality.h>
39#include <sys/prctl.h>
40#include <sys/types.h>
6916b164 41#include <sys/wait.h>
8fe0087e 42#include <unistd.h>
1b9e5b12 43
b053cd5f 44#include "sd-bus.h"
1f0cd86b 45#include "sd-daemon.h"
1f0cd86b 46#include "sd-id128.h"
8fe0087e 47
b5efdb8a 48#include "alloc-util.h"
8fe0087e
LP		 49#include "barrier.h"
50#include "base-filesystem.h"
51#include "blkid-util.h"
52#include "btrfs-util.h"
b053cd5f 53#include "bus-util.h"
8fe0087e 54#include "cap-list.h"
430f0182 55#include "capability-util.h"
04d391da 56#include "cgroup-util.h"
8fe0087e 57#include "copy.h"
4fc9982c 58#include "dev-setup.h"
2d845785 59#include "dissect-image.h"
8fe0087e 60#include "env-util.h"
3ffd4af2 61#include "fd-util.h"
842f3b0f 62#include "fdset.h"
a5c32cff 63#include "fileio.h"
f97b34a6 64#include "format-util.h"
f4f15635 65#include "fs-util.h"
1b9e5b12 66#include "gpt.h"
4623e8e6 67#include "hexdecoct.h"
8fe0087e 68#include "hostname-util.h"
910fd145 69#include "id128-util.h"
8fe0087e 70#include "log.h"
2d845785 71#include "loop-util.h"
8fe0087e 72#include "loopback-setup.h"
1b9cebf6 73#include "machine-image.h"
8fe0087e
LP		 74#include "macro.h"
75#include "missing.h"
76#include "mkdir.h"
4349cd7c 77#include "mount-util.h"
8fe0087e 78#include "netlink-util.h"
07630cea
LP		 79#include "nspawn-cgroup.h"
80#include "nspawn-expose-ports.h"
81#include "nspawn-mount.h"
82#include "nspawn-network.h"
7336138e 83#include "nspawn-patch-uid.h"
07630cea 84#include "nspawn-register.h"
910fd145 85#include "nspawn-seccomp.h"
07630cea
LP		 86#include "nspawn-settings.h"
87#include "nspawn-setuid.h"
7732f92b 88#include "nspawn-stub-pid1.h"
6bedfcbb 89#include "parse-util.h"
8fe0087e 90#include "path-util.h"
0b452006 91#include "process-util.h"
8fe0087e
LP		 92#include "ptyfwd.h"
93#include "random-util.h"
8869a0b4 94#include "raw-clone.h"
8fe0087e 95#include "rm-rf.h"
68b02049 96#include "selinux-util.h"
8fe0087e 97#include "signal-util.h"
2583fbea 98#include "socket-util.h"
8fcde012 99#include "stat-util.h"
15a5e950 100#include "stdio-util.h"
07630cea 101#include "string-util.h"
8fe0087e
LP		 102#include "strv.h"
103#include "terminal-util.h"
104#include "udev-util.h"
affb60b1 105#include "umask-util.h"
b1d4f8e1 106#include "user-util.h"
8fe0087e 107#include "util.h"
e9642be2 108
0e7ac751 109/* Note that devpts's gid= parameter parses GIDs as signed values, hence we stay away from the upper half of the 32bit
065d31c3
LP		 110 * UID range here. We leave a bit of room at the lower end and a lot of room at the upper end, so that other subsystems
111 * may have their own allocation ranges too. */
0e7ac751
LP		 112#define UID_SHIFT_PICK_MIN ((uid_t) UINT32_C(0x00080000))
113#define UID_SHIFT_PICK_MAX ((uid_t) UINT32_C(0x6FFF0000))
065d31c3 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,
124 CONTAINER_REBOOTED
125} ContainerStatus;
126
57fb9fb5
LP		 127typedef enum LinkJournal {
128 LINK_NO,
129 LINK_AUTO,
130 LINK_HOST,
131 LINK_GUEST
132} LinkJournal;
88213476
LP		 133
134static char *arg_directory = NULL;
ec16945e 135static char *arg_template = NULL;
5f932eb9 136static char *arg_chdir = NULL;
b53ede69
PW		 137static char *arg_pivot_root_new = NULL;
138static char *arg_pivot_root_old = NULL;
687d0825 139static char *arg_user = NULL;
9444b1f2 140static sd_id128_t arg_uuid = {};
7027ff61 141static char *arg_machine = NULL;
c74e630d
LP		 142static const char *arg_selinux_context = NULL;
143static const char *arg_selinux_apifs_context = NULL;
9444b1f2 144static const char *arg_slice = NULL;
ff01d048 145static bool arg_private_network = false;
bc2f673e 146static bool arg_read_only = false;
7732f92b 147static StartMode arg_start_mode = START_PID1;
ec16945e 148static bool arg_ephemeral = false;
57fb9fb5 149static LinkJournal arg_link_journal = LINK_AUTO;
574edc90 150static bool arg_link_journal_try = false;
520e0d54 151static uint64_t arg_caps_retain =
50b52222
LP		 152 (1ULL << CAP_AUDIT_CONTROL) |
153 (1ULL << CAP_AUDIT_WRITE) |
5076f0cc
LP		 154 (1ULL << CAP_CHOWN) |
155 (1ULL << CAP_DAC_OVERRIDE) |
156 (1ULL << CAP_DAC_READ_SEARCH) |
157 (1ULL << CAP_FOWNER) |
158 (1ULL << CAP_FSETID) |
159 (1ULL << CAP_IPC_OWNER) |
160 (1ULL << CAP_KILL) |
161 (1ULL << CAP_LEASE) |
162 (1ULL << CAP_LINUX_IMMUTABLE) |
50b52222 163 (1ULL << CAP_MKNOD) |
5076f0cc
LP		 164 (1ULL << CAP_NET_BIND_SERVICE) |
165 (1ULL << CAP_NET_BROADCAST) |
166 (1ULL << CAP_NET_RAW) |
5076f0cc 167 (1ULL << CAP_SETFCAP) |
50b52222 168 (1ULL << CAP_SETGID) |
5076f0cc
LP		 169 (1ULL << CAP_SETPCAP) |
170 (1ULL << CAP_SETUID) |
171 (1ULL << CAP_SYS_ADMIN) |
50b52222 172 (1ULL << CAP_SYS_BOOT) |
5076f0cc
LP		 173 (1ULL << CAP_SYS_CHROOT) |
174 (1ULL << CAP_SYS_NICE) |
175 (1ULL << CAP_SYS_PTRACE) |
d87be9b0 176 (1ULL << CAP_SYS_RESOURCE) |
50b52222 177 (1ULL << CAP_SYS_TTY_CONFIG);
5a8af538
LP		 178static CustomMount *arg_custom_mounts = NULL;
179static unsigned arg_n_custom_mounts = 0;
f4889f65 180static char **arg_setenv = NULL;
284c0b91 181static bool arg_quiet = false;
eb91eb18 182static bool arg_register = true;
89f7c846 183static bool arg_keep_unit = false;
aa28aefe 184static char **arg_network_interfaces = NULL;
c74e630d 185static char **arg_network_macvlan = NULL;
4bbfe7ad 186static char **arg_network_ipvlan = NULL;
69c79d3c 187static bool arg_network_veth = false;
f6d6bad1 188static char **arg_network_veth_extra = NULL;
f757855e 189static char *arg_network_bridge = NULL;
22b28dfd 190static char *arg_network_zone = NULL;
050f7277 191static unsigned long arg_personality = PERSONALITY_INVALID;
ec16945e 192static char *arg_image = NULL;
f757855e 193static VolatileMode arg_volatile_mode = VOLATILE_NO;
6d0b55c2 194static ExposePort *arg_expose_ports = NULL;
f36933fe 195static char **arg_property = NULL;
0de7acce 196static UserNamespaceMode arg_userns_mode = USER_NAMESPACE_NO;
6dac160c 197static uid_t arg_uid_shift = UID_INVALID, arg_uid_range = 0x10000U;
0de7acce 198static bool arg_userns_chown = false;
c6c8f6e2 199static int arg_kill_signal = 0;
5da38d07 200static CGroupUnified arg_unified_cgroup_hierarchy = CGROUP_UNIFIED_UNKNOWN;
f757855e
LP		 201static SettingsMask arg_settings_mask = 0;
202static int arg_settings_trusted = -1;
203static char **arg_parameters = NULL;
6aadfa4c 204static const char *arg_container_service_name = "systemd-nspawn";
9c1e04d0 205static bool arg_notify_ready = false;
5a8ff0e6 206static bool arg_use_cgns = true;
0c582db0 207static unsigned long arg_clone_ns_flags = CLONE_NEWIPC|CLONE_NEWPID|CLONE_NEWUTS;
4f086aab 208static MountSettingsMask arg_mount_settings = MOUNT_APPLY_APIVFS_RO;
4623e8e6
LP		 209static void *arg_root_hash = NULL;
210static size_t arg_root_hash_size = 0;
960e4569
LP		 211static char **arg_syscall_whitelist = NULL;
212static char **arg_syscall_blacklist = NULL;
88213476 213
601185b4 214static void help(void) {
88213476
LP		 215 printf("%s [OPTIONS...] [PATH] [ARGUMENTS...]\n\n"
216 "Spawn a minimal namespace container for debugging, testing and building.\n\n"
a8828ed9
DW		 217 " -h --help Show this help\n"
218 " --version Print version string\n"
69c79d3c 219 " -q --quiet Do not show status information\n"
1b9e5b12 220 " -D --directory=PATH Root directory for the container\n"
ec16945e
LP		 221 " --template=PATH Initialize root directory from template directory,\n"
222 " if missing\n"
223 " -x --ephemeral Run container with snapshot of root directory, and\n"
224 " remove it after exit\n"
225 " -i --image=PATH File system device or disk image for the container\n"
4623e8e6 226 " --root-hash=HASH Specify verity root hash\n"
7732f92b 227 " -a --as-pid2 Maintain a stub init as PID1, invoke binary as PID2\n"
a8828ed9 228 " -b --boot Boot up full system (i.e. invoke init)\n"
5f932eb9 229 " --chdir=PATH Set working directory in the container\n"
b53ede69
PW		 230 " --pivot-root=PATH[:PATH]\n"
231 " Pivot root to given directory in the container\n"
a8828ed9 232 " -u --user=USER Run the command under specified user or uid\n"
a8828ed9 233 " -M --machine=NAME Set the machine name for the container\n"
69c79d3c 234 " --uuid=UUID Set a specific machine UUID for the container\n"
a8828ed9 235 " -S --slice=SLICE Place the container in the specified slice\n"
f36933fe 236 " --property=NAME=VALUE Set scope unit property\n"
90b4a64d 237 " -U --private-users=pick Run within user namespace, autoselect UID/GID range\n"
03cfe0d5 238 " --private-users[=UIDBASE[:NUIDS]]\n"
90b4a64d 239 " Similar, but with user configured UID/GID range\n"
24597ee0 240 " --private-users-chown Adjust OS tree ownership to private UID/GID range\n"
69c79d3c
LP		 241 " --private-network Disable network in container\n"
242 " --network-interface=INTERFACE\n"
243 " Assign an existing network interface to the\n"
244 " container\n"
c74e630d
LP		 245 " --network-macvlan=INTERFACE\n"
246 " Create a macvlan network interface based on an\n"
247 " existing network interface to the container\n"
4bbfe7ad
TG		 248 " --network-ipvlan=INTERFACE\n"
249 " Create a ipvlan network interface based on an\n"
250 " existing network interface to the container\n"
a8eaaee7 251 " -n --network-veth Add a virtual Ethernet connection between host\n"
69c79d3c 252 " and container\n"
f6d6bad1
LP		 253 " --network-veth-extra=HOSTIF[:CONTAINERIF]\n"
254 " Add an additional virtual Ethernet link between\n"
255 " host and container\n"
ab046dde 256 " --network-bridge=INTERFACE\n"
90b4a64d
ZJS		 257 " Add a virtual Ethernet connection to the container\n"
258 " and attach it to an existing bridge on the host\n"
259 " --network-zone=NAME Similar, but attach the new interface to an\n"
260 " an automatically managed bridge interface\n"
6d0b55c2 261 " -p --port=[PROTOCOL:]HOSTPORT[:CONTAINERPORT]\n"
ab5e3a1b 262 " Expose a container IP port on the host\n"
82adf6af
LP		 263 " -Z --selinux-context=SECLABEL\n"
264 " Set the SELinux security context to be used by\n"
265 " processes in the container\n"
266 " -L --selinux-apifs-context=SECLABEL\n"
267 " Set the SELinux security context to be used by\n"
268 " API/tmpfs file systems in the container\n"
a8828ed9
DW		 269 " --capability=CAP In addition to the default, retain specified\n"
270 " capability\n"
271 " --drop-capability=CAP Drop the specified capability from the default set\n"
960e4569
LP		 272 " --system-call-filter=LIST|~LIST\n"
273 " Permit/prohibit specific system calls\n"
c6c8f6e2 274 " --kill-signal=SIGNAL Select signal to use for shutting down PID 1\n"
2b26a728
LP		 275 " --link-journal=MODE Link up guest journal, one of no, auto, guest, \n"
276 " host, try-guest, try-host\n"
574edc90 277 " -j Equivalent to --link-journal=try-guest\n"
69c79d3c 278 " --read-only Mount the root directory read-only\n"
5e5bfa6e
EY		 279 " --bind=PATH[:PATH[:OPTIONS]]\n"
280 " Bind mount a file or directory from the host into\n"
a8828ed9 281 " the container\n"
5e5bfa6e
EY		 282 " --bind-ro=PATH[:PATH[:OPTIONS]\n"
283 " Similar, but creates a read-only bind mount\n"
06c17c39 284 " --tmpfs=PATH:[OPTIONS] Mount an empty tmpfs to the specified directory\n"
5a8af538
LP		 285 " --overlay=PATH[:PATH...]:PATH\n"
286 " Create an overlay mount from the host to \n"
287 " the container\n"
288 " --overlay-ro=PATH[:PATH...]:PATH\n"
289 " Similar, but creates a read-only overlay mount\n"
a5f1cb3b 290 " -E --setenv=NAME=VALUE Pass an environment variable to PID 1\n"
eb91eb18 291 " --register=BOOLEAN Register container as machine\n"
89f7c846 292 " --keep-unit Do not register a scope for the machine, reuse\n"
4d9f07b4 293 " the service unit nspawn is running in\n"
6d0b55c2 294 " --volatile[=MODE] Run the system in volatile mode\n"
f757855e 295 " --settings=BOOLEAN Load additional settings from .nspawn file\n"
90b4a64d 296 " --notify-ready=BOOLEAN Receive notifications from the child init process\n"
6d0b55c2 297 , program_invocation_short_name);
88213476
LP		 298}
299
86c0dd4a 300static int custom_mount_check_all(void) {
5a8af538 301 unsigned i;
5a8af538 302
5a8af538
LP		 303 for (i = 0; i < arg_n_custom_mounts; i++) {
304 CustomMount *m = &arg_custom_mounts[i];
305
0de7acce 306 if (path_equal(m->destination, "/") && arg_userns_mode != USER_NAMESPACE_NO) {
0e7ac751
LP		 307
308 if (arg_userns_chown) {
309 log_error("--private-users-chown may not be combined with custom root mounts.");
310 return -EINVAL;
311 } else if (arg_uid_shift == UID_INVALID) {
312 log_error("--private-users with automatic UID shift may not be combined with custom root mounts.");
313 return -EINVAL;
314 }
825d5287 315 }
5a8af538
LP		 316 }
317
318 return 0;
319}
320
0fd9563f 321static int detect_unified_cgroup_hierarchy(const char *directory) {
efdb0237 322 const char *e;
415fc41c 323 int r;
5da38d07 324
efdb0237
LP		 325 /* Allow the user to control whether the unified hierarchy is used */
326 e = getenv("UNIFIED_CGROUP_HIERARCHY");
327 if (e) {
328 r = parse_boolean(e);
329 if (r < 0)
330 return log_error_errno(r, "Failed to parse $UNIFIED_CGROUP_HIERARCHY.");
5da38d07
TH		 331 if (r > 0)
332 arg_unified_cgroup_hierarchy = CGROUP_UNIFIED_ALL;
333 else
334 arg_unified_cgroup_hierarchy = CGROUP_UNIFIED_NONE;
efdb0237 335
efdb0237
LP		 336 return 0;
337 }
338
339 /* Otherwise inherit the default from the host system */
b4cccbc1
LP		 340 r = cg_all_unified();
341 if (r < 0)
342 return log_error_errno(r, "Failed to determine whether we are in all unified mode.");
343 if (r > 0) {
a8725a06
ZJS		 344 /* Unified cgroup hierarchy support was added in 230. Unfortunately the detection
345 * routine only detects 231, so we'll have a false negative here for 230. */
346 r = systemd_installation_has_version(directory, 230);
347 if (r < 0)
348 return log_error_errno(r, "Failed to determine systemd version in container: %m");
349 if (r > 0)
350 arg_unified_cgroup_hierarchy = CGROUP_UNIFIED_ALL;
351 else
352 arg_unified_cgroup_hierarchy = CGROUP_UNIFIED_NONE;
c22800e4 353 } else if (cg_unified_controller(SYSTEMD_CGROUP_CONTROLLER) > 0) {
2977724b
TH		 354 /* Mixed cgroup hierarchy support was added in 233 */
355 r = systemd_installation_has_version(directory, 233);
0fd9563f
ZJS		 356 if (r < 0)
357 return log_error_errno(r, "Failed to determine systemd version in container: %m");
358 if (r > 0)
359 arg_unified_cgroup_hierarchy = CGROUP_UNIFIED_SYSTEMD;
360 else
361 arg_unified_cgroup_hierarchy = CGROUP_UNIFIED_NONE;
362 } else
5da38d07 363 arg_unified_cgroup_hierarchy = CGROUP_UNIFIED_NONE;
efdb0237 364
efdb0237
LP		 365 return 0;
366}
367
0c582db0
LB		 368static void parse_share_ns_env(const char *name, unsigned long ns_flag) {
369 int r;
370
371 r = getenv_bool(name);
372 if (r == -ENXIO)
373 return;
374 if (r < 0)
375 log_warning_errno(r, "Failed to parse %s from environment, defaulting to false.", name);
376 arg_clone_ns_flags = (arg_clone_ns_flags & ~ns_flag) | (r > 0 ? 0 : ns_flag);
377}
378
4f086aab
SU		 379static void parse_mount_settings_env(void) {
380 int r;
381 const char *e;
382
383 e = getenv("SYSTEMD_NSPAWN_API_VFS_WRITABLE");
384 if (!e)
385 return;
386
387 if (streq(e, "network")) {
388 arg_mount_settings |= MOUNT_APPLY_APIVFS_RO|MOUNT_APPLY_APIVFS_NETNS;
389 return;
390 }
391
392 r = parse_boolean(e);
393 if (r < 0) {
394 log_warning_errno(r, "Failed to parse SYSTEMD_NSPAWN_API_VFS_WRITABLE from environment, ignoring.");
395 return;
ab8ee0f2 396 }
4f086aab 397
ab8ee0f2
ZJS		 398 SET_FLAG(arg_mount_settings, MOUNT_APPLY_APIVFS_RO, r == 0);
399 SET_FLAG(arg_mount_settings, MOUNT_APPLY_APIVFS_NETNS, false);
4f086aab
SU		 400}
401
88213476
LP		 402static int parse_argv(int argc, char *argv[]) {
403
a41fe3a2 404 enum {
acbeb427
ZJS		 405 ARG_VERSION = 0x100,
406 ARG_PRIVATE_NETWORK,
bc2f673e 407 ARG_UUID,
5076f0cc 408 ARG_READ_ONLY,
57fb9fb5 409 ARG_CAPABILITY,
420c7379 410 ARG_DROP_CAPABILITY,
17fe0523
LP		 411 ARG_LINK_JOURNAL,
412 ARG_BIND,
f4889f65 413 ARG_BIND_RO,
06c17c39 414 ARG_TMPFS,
5a8af538
LP		 415 ARG_OVERLAY,
416 ARG_OVERLAY_RO,
eb91eb18 417 ARG_SHARE_SYSTEM,
89f7c846 418 ARG_REGISTER,
aa28aefe 419 ARG_KEEP_UNIT,
69c79d3c 420 ARG_NETWORK_INTERFACE,
c74e630d 421 ARG_NETWORK_MACVLAN,
4bbfe7ad 422 ARG_NETWORK_IPVLAN,
ab046dde 423 ARG_NETWORK_BRIDGE,
22b28dfd 424 ARG_NETWORK_ZONE,
f6d6bad1 425 ARG_NETWORK_VETH_EXTRA,
6afc95b7 426 ARG_PERSONALITY,
4d9f07b4 427 ARG_VOLATILE,
ec16945e 428 ARG_TEMPLATE,
f36933fe 429 ARG_PROPERTY,
6dac160c 430 ARG_PRIVATE_USERS,
c6c8f6e2 431 ARG_KILL_SIGNAL,
f757855e 432 ARG_SETTINGS,
5f932eb9 433 ARG_CHDIR,
b53ede69 434 ARG_PIVOT_ROOT,
7336138e 435 ARG_PRIVATE_USERS_CHOWN,
9c1e04d0 436 ARG_NOTIFY_READY,
4623e8e6 437 ARG_ROOT_HASH,
960e4569 438 ARG_SYSTEM_CALL_FILTER,
a41fe3a2
LP		 439 };
440
88213476 441 static const struct option options[] = {
27eb8e90
ZJS		 442 { "help", no_argument, NULL, 'h' },
443 { "version", no_argument, NULL, ARG_VERSION },
444 { "directory", required_argument, NULL, 'D' },
445 { "template", required_argument, NULL, ARG_TEMPLATE },
446 { "ephemeral", no_argument, NULL, 'x' },
447 { "user", required_argument, NULL, 'u' },
448 { "private-network", no_argument, NULL, ARG_PRIVATE_NETWORK },
449 { "as-pid2", no_argument, NULL, 'a' },
450 { "boot", no_argument, NULL, 'b' },
451 { "uuid", required_argument, NULL, ARG_UUID },
452 { "read-only", no_argument, NULL, ARG_READ_ONLY },
453 { "capability", required_argument, NULL, ARG_CAPABILITY },
454 { "drop-capability", required_argument, NULL, ARG_DROP_CAPABILITY },
455 { "link-journal", required_argument, NULL, ARG_LINK_JOURNAL },
456 { "bind", required_argument, NULL, ARG_BIND },
457 { "bind-ro", required_argument, NULL, ARG_BIND_RO },
458 { "tmpfs", required_argument, NULL, ARG_TMPFS },
459 { "overlay", required_argument, NULL, ARG_OVERLAY },
460 { "overlay-ro", required_argument, NULL, ARG_OVERLAY_RO },
461 { "machine", required_argument, NULL, 'M' },
462 { "slice", required_argument, NULL, 'S' },
463 { "setenv", required_argument, NULL, 'E' },
464 { "selinux-context", required_argument, NULL, 'Z' },
465 { "selinux-apifs-context", required_argument, NULL, 'L' },
466 { "quiet", no_argument, NULL, 'q' },
467 { "share-system", no_argument, NULL, ARG_SHARE_SYSTEM }, /* not documented */
468 { "register", required_argument, NULL, ARG_REGISTER },
469 { "keep-unit", no_argument, NULL, ARG_KEEP_UNIT },
470 { "network-interface", required_argument, NULL, ARG_NETWORK_INTERFACE },
471 { "network-macvlan", required_argument, NULL, ARG_NETWORK_MACVLAN },
472 { "network-ipvlan", required_argument, NULL, ARG_NETWORK_IPVLAN },
473 { "network-veth", no_argument, NULL, 'n' },
474 { "network-veth-extra", required_argument, NULL, ARG_NETWORK_VETH_EXTRA },
475 { "network-bridge", required_argument, NULL, ARG_NETWORK_BRIDGE },
476 { "network-zone", required_argument, NULL, ARG_NETWORK_ZONE },
477 { "personality", required_argument, NULL, ARG_PERSONALITY },
478 { "image", required_argument, NULL, 'i' },
479 { "volatile", optional_argument, NULL, ARG_VOLATILE },
480 { "port", required_argument, NULL, 'p' },
481 { "property", required_argument, NULL, ARG_PROPERTY },
482 { "private-users", optional_argument, NULL, ARG_PRIVATE_USERS },
483 { "private-users-chown", optional_argument, NULL, ARG_PRIVATE_USERS_CHOWN },
484 { "kill-signal", required_argument, NULL, ARG_KILL_SIGNAL },
485 { "settings", required_argument, NULL, ARG_SETTINGS },
486 { "chdir", required_argument, NULL, ARG_CHDIR },
b53ede69 487 { "pivot-root", required_argument, NULL, ARG_PIVOT_ROOT },
27eb8e90 488 { "notify-ready", required_argument, NULL, ARG_NOTIFY_READY },
4623e8e6 489 { "root-hash", required_argument, NULL, ARG_ROOT_HASH },
960e4569 490 { "system-call-filter", required_argument, NULL, ARG_SYSTEM_CALL_FILTER },
eb9da376 491 {}
88213476
LP		 492 };
493
9444b1f2 494 int c, r;
6aadfa4c 495 const char *p, *e;
a42c8b54 496 uint64_t plus = 0, minus = 0;
f757855e 497 bool mask_all_settings = false, mask_no_settings = false;
88213476
LP		 498
499 assert(argc >= 0);
500 assert(argv);
501
2e1f244e 502 while ((c = getopt_long(argc, argv, "+hD:u:abL:M:jS:Z:qi:xp:nUE:", options, NULL)) >= 0)
88213476
LP		 503
504 switch (c) {
505
506 case 'h':
601185b4
ZJS		 507 help();
508 return 0;
88213476 509
acbeb427 510 case ARG_VERSION:
3f6fd1ba 511 return version();
acbeb427 512
88213476 513 case 'D':
0f03c2a4 514 r = parse_path_argument_and_warn(optarg, false, &arg_directory);
ec16945e 515 if (r < 0)
0f03c2a4 516 return r;
ec16945e
LP		 517 break;
518
519 case ARG_TEMPLATE:
0f03c2a4 520 r = parse_path_argument_and_warn(optarg, false, &arg_template);
ec16945e 521 if (r < 0)
0f03c2a4 522 return r;
88213476
LP		 523 break;
524
1b9e5b12 525 case 'i':
0f03c2a4 526 r = parse_path_argument_and_warn(optarg, false, &arg_image);
ec16945e 527 if (r < 0)
0f03c2a4 528 return r;
ec16945e
LP		 529 break;
530
531 case 'x':
532 arg_ephemeral = true;
1b9e5b12
LP		 533 break;
534
687d0825 535 case 'u':
2fc09a9c
DM		 536 r = free_and_strdup(&arg_user, optarg);
537 if (r < 0)
7027ff61 538 return log_oom();
687d0825 539
f757855e 540 arg_settings_mask |= SETTING_USER;
687d0825
MV		 541 break;
542
22b28dfd
LP		 543 case ARG_NETWORK_ZONE: {
544 char *j;
545
546 j = strappend("vz-", optarg);
547 if (!j)
548 return log_oom();
549
550 if (!ifname_valid(j)) {
551 log_error("Network zone name not valid: %s", j);
552 free(j);
553 return -EINVAL;
554 }
555
556 free(arg_network_zone);
557 arg_network_zone = j;
558
559 arg_network_veth = true;
560 arg_private_network = true;
561 arg_settings_mask |= SETTING_NETWORK;
562 break;
563 }
564
ab046dde 565 case ARG_NETWORK_BRIDGE:
ef76dff2
LP		 566
567 if (!ifname_valid(optarg)) {
568 log_error("Bridge interface name not valid: %s", optarg);
569 return -EINVAL;
570 }
571
f757855e
LP		 572 r = free_and_strdup(&arg_network_bridge, optarg);
573 if (r < 0)
574 return log_oom();
ab046dde
TG		 575
576 /* fall through */
577
0dfaa006 578 case 'n':
69c79d3c
LP		 579 arg_network_veth = true;
580 arg_private_network = true;
f757855e 581 arg_settings_mask |= SETTING_NETWORK;
69c79d3c
LP		 582 break;
583
f6d6bad1
LP		 584 case ARG_NETWORK_VETH_EXTRA:
585 r = veth_extra_parse(&arg_network_veth_extra, optarg);
586 if (r < 0)
587 return log_error_errno(r, "Failed to parse --network-veth-extra= parameter: %s", optarg);
588
589 arg_private_network = true;
590 arg_settings_mask |= SETTING_NETWORK;
591 break;
592
aa28aefe 593 case ARG_NETWORK_INTERFACE:
ef76dff2
LP		 594
595 if (!ifname_valid(optarg)) {
596 log_error("Network interface name not valid: %s", optarg);
597 return -EINVAL;
598 }
599
c74e630d
LP		 600 if (strv_extend(&arg_network_interfaces, optarg) < 0)
601 return log_oom();
602
603 arg_private_network = true;
f757855e 604 arg_settings_mask |= SETTING_NETWORK;
c74e630d
LP		 605 break;
606
607 case ARG_NETWORK_MACVLAN:
ef76dff2
LP		 608
609 if (!ifname_valid(optarg)) {
610 log_error("MACVLAN network interface name not valid: %s", optarg);
611 return -EINVAL;
612 }
613
c74e630d 614 if (strv_extend(&arg_network_macvlan, optarg) < 0)
aa28aefe
LP		 615 return log_oom();
616
4bbfe7ad 617 arg_private_network = true;
f757855e 618 arg_settings_mask |= SETTING_NETWORK;
4bbfe7ad
TG		 619 break;
620
621 case ARG_NETWORK_IPVLAN:
ef76dff2
LP		 622
623 if (!ifname_valid(optarg)) {
624 log_error("IPVLAN network interface name not valid: %s", optarg);
625 return -EINVAL;
626 }
627
4bbfe7ad
TG		 628 if (strv_extend(&arg_network_ipvlan, optarg) < 0)
629 return log_oom();
630
aa28aefe
LP		 631 /* fall through */
632
ff01d048
LP		 633 case ARG_PRIVATE_NETWORK:
634 arg_private_network = true;
f757855e 635 arg_settings_mask |= SETTING_NETWORK;
a41fe3a2
LP		 636 break;
637
0f0dbc46 638 case 'b':
7732f92b
LP		 639 if (arg_start_mode == START_PID2) {
640 log_error("--boot and --as-pid2 may not be combined.");
641 return -EINVAL;
642 }
643
644 arg_start_mode = START_BOOT;
645 arg_settings_mask |= SETTING_START_MODE;
646 break;
647
648 case 'a':
649 if (arg_start_mode == START_BOOT) {
650 log_error("--boot and --as-pid2 may not be combined.");
651 return -EINVAL;
652 }
653
654 arg_start_mode = START_PID2;
655 arg_settings_mask |= SETTING_START_MODE;
0f0dbc46
LP		 656 break;
657
144f0fc0 658 case ARG_UUID:
9444b1f2 659 r = sd_id128_from_string(optarg, &arg_uuid);
317feb4d
LP		 660 if (r < 0)
661 return log_error_errno(r, "Invalid UUID: %s", optarg);
662
663 if (sd_id128_is_null(arg_uuid)) {
664 log_error("Machine UUID may not be all zeroes.");
665 return -EINVAL;
aa96c6cb 666 }
f757855e
LP		 667
668 arg_settings_mask |= SETTING_MACHINE_ID;
9444b1f2 669 break;
aa96c6cb 670
9444b1f2 671 case 'S':
c74e630d 672 arg_slice = optarg;
144f0fc0
LP		 673 break;
674
7027ff61 675 case 'M':
c1521918 676 if (isempty(optarg))
97b11eed 677 arg_machine = mfree(arg_machine);
c1521918 678 else {
0c3c4284 679 if (!machine_name_is_valid(optarg)) {
eb91eb18
LP		 680 log_error("Invalid machine name: %s", optarg);
681 return -EINVAL;
682 }
7027ff61 683
0c3c4284
LP		 684 r = free_and_strdup(&arg_machine, optarg);
685 if (r < 0)
eb91eb18 686 return log_oom();
eb91eb18 687 }
9ce6d1b3 688 break;
7027ff61 689
82adf6af
LP		 690 case 'Z':
691 arg_selinux_context = optarg;
a8828ed9
DW		 692 break;
693
82adf6af
LP		 694 case 'L':
695 arg_selinux_apifs_context = optarg;
a8828ed9
DW		 696 break;
697
bc2f673e
LP		 698 case ARG_READ_ONLY:
699 arg_read_only = true;
f757855e 700 arg_settings_mask |= SETTING_READ_ONLY;
bc2f673e
LP		 701 break;
702
420c7379
LP		 703 case ARG_CAPABILITY:
704 case ARG_DROP_CAPABILITY: {
6cbe4ed1 705 p = optarg;
9ed794a3 706 for (;;) {
6cbe4ed1 707 _cleanup_free_ char *t = NULL;
5076f0cc 708
6cbe4ed1
SS		 709 r = extract_first_word(&p, &t, ",", 0);
710 if (r < 0)
711 return log_error_errno(r, "Failed to parse capability %s.", t);
5076f0cc 712
6cbe4ed1
SS		 713 if (r == 0)
714 break;
5076f0cc 715
39ed67d1
LP		 716 if (streq(t, "all")) {
717 if (c == ARG_CAPABILITY)
a42c8b54 718 plus = (uint64_t) -1;
39ed67d1 719 else
a42c8b54 720 minus = (uint64_t) -1;
39ed67d1 721 } else {
2822da4f
LP		 722 int cap;
723
724 cap = capability_from_name(t);
725 if (cap < 0) {
39ed67d1
LP		 726 log_error("Failed to parse capability %s.", t);
727 return -EINVAL;
728 }
729
730 if (c == ARG_CAPABILITY)
a42c8b54 731 plus |= 1ULL << (uint64_t) cap;
39ed67d1 732 else
a42c8b54 733 minus |= 1ULL << (uint64_t) cap;
5076f0cc 734 }
5076f0cc
LP		 735 }
736
f757855e 737 arg_settings_mask |= SETTING_CAPABILITY;
5076f0cc
LP		 738 break;
739 }
740
57fb9fb5
LP		 741 case 'j':
742 arg_link_journal = LINK_GUEST;
574edc90 743 arg_link_journal_try = true;
57fb9fb5
LP		 744 break;
745
746 case ARG_LINK_JOURNAL:
53e438e3 747 if (streq(optarg, "auto")) {
57fb9fb5 748 arg_link_journal = LINK_AUTO;
53e438e3
LP		 749 arg_link_journal_try = false;
750 } else if (streq(optarg, "no")) {
57fb9fb5 751 arg_link_journal = LINK_NO;
53e438e3
LP		 752 arg_link_journal_try = false;
753 } else if (streq(optarg, "guest")) {
57fb9fb5 754 arg_link_journal = LINK_GUEST;
53e438e3
LP		 755 arg_link_journal_try = false;
756 } else if (streq(optarg, "host")) {
57fb9fb5 757 arg_link_journal = LINK_HOST;
53e438e3
LP		 758 arg_link_journal_try = false;
759 } else if (streq(optarg, "try-guest")) {
574edc90
MP		 760 arg_link_journal = LINK_GUEST;
761 arg_link_journal_try = true;
762 } else if (streq(optarg, "try-host")) {
763 arg_link_journal = LINK_HOST;
764 arg_link_journal_try = true;
765 } else {
57fb9fb5
LP		 766 log_error("Failed to parse link journal mode %s", optarg);
767 return -EINVAL;
768 }
769
770 break;
771
17fe0523 772 case ARG_BIND:
f757855e
LP		 773 case ARG_BIND_RO:
774 r = bind_mount_parse(&arg_custom_mounts, &arg_n_custom_mounts, optarg, c == ARG_BIND_RO);
775 if (r < 0)
776 return log_error_errno(r, "Failed to parse --bind(-ro)= argument %s: %m", optarg);
17fe0523 777
f757855e 778 arg_settings_mask |= SETTING_CUSTOM_MOUNTS;
17fe0523 779 break;
06c17c39 780
f757855e
LP		 781 case ARG_TMPFS:
782 r = tmpfs_mount_parse(&arg_custom_mounts, &arg_n_custom_mounts, optarg);
783 if (r < 0)
784 return log_error_errno(r, "Failed to parse --tmpfs= argument %s: %m", optarg);
5a8af538 785
f757855e 786 arg_settings_mask |= SETTING_CUSTOM_MOUNTS;
5a8af538 787 break;
5a8af538
LP		 788
789 case ARG_OVERLAY:
ad85779a
LP		 790 case ARG_OVERLAY_RO:
791 r = overlay_mount_parse(&arg_custom_mounts, &arg_n_custom_mounts, optarg, c == ARG_OVERLAY_RO);
792 if (r == -EADDRNOTAVAIL)
793 return log_error_errno(r, "--overlay(-ro)= needs at least two colon-separated directories specified.");
794 if (r < 0)
795 return log_error_errno(r, "Failed to parse --overlay(-ro)= argument %s: %m", optarg);
06c17c39 796
f757855e 797 arg_settings_mask |= SETTING_CUSTOM_MOUNTS;
06c17c39 798 break;
06c17c39 799
a5f1cb3b 800 case 'E': {
f4889f65
LP		 801 char **n;
802
803 if (!env_assignment_is_valid(optarg)) {
804 log_error("Environment variable assignment '%s' is not valid.", optarg);
805 return -EINVAL;
806 }
807
808 n = strv_env_set(arg_setenv, optarg);
809 if (!n)
810 return log_oom();
811
812 strv_free(arg_setenv);
813 arg_setenv = n;
f757855e
LP		 814
815 arg_settings_mask |= SETTING_ENVIRONMENT;
f4889f65
LP		 816 break;
817 }
818
284c0b91
LP		 819 case 'q':
820 arg_quiet = true;
821 break;
822
8a96d94e 823 case ARG_SHARE_SYSTEM:
a6b5216c 824 /* We don't officially support this anymore, except for compat reasons. People should use the
0c582db0
LB		 825 * $SYSTEMD_NSPAWN_SHARE_* environment variables instead. */
826 arg_clone_ns_flags = 0;
8a96d94e
LP		 827 break;
828
eb91eb18
LP		 829 case ARG_REGISTER:
830 r = parse_boolean(optarg);
831 if (r < 0) {
832 log_error("Failed to parse --register= argument: %s", optarg);
833 return r;
834 }
835
836 arg_register = r;
837 break;
838
89f7c846
LP		 839 case ARG_KEEP_UNIT:
840 arg_keep_unit = true;
841 break;
842
6afc95b7
LP		 843 case ARG_PERSONALITY:
844
ac45f971 845 arg_personality = personality_from_string(optarg);
050f7277 846 if (arg_personality == PERSONALITY_INVALID) {
6afc95b7
LP		 847 log_error("Unknown or unsupported personality '%s'.", optarg);
848 return -EINVAL;
849 }
850
f757855e 851 arg_settings_mask |= SETTING_PERSONALITY;
6afc95b7
LP		 852 break;
853
4d9f07b4
LP		 854 case ARG_VOLATILE:
855
856 if (!optarg)
f757855e 857 arg_volatile_mode = VOLATILE_YES;
4d9f07b4 858 else {
f757855e 859 VolatileMode m;
4d9f07b4 860
f757855e
LP		 861 m = volatile_mode_from_string(optarg);
862 if (m < 0) {
863 log_error("Failed to parse --volatile= argument: %s", optarg);
6d0b55c2 864 return -EINVAL;
f757855e
LP		 865 } else
866 arg_volatile_mode = m;
6d0b55c2
LP		 867 }
868
f757855e
LP		 869 arg_settings_mask |= SETTING_VOLATILE_MODE;
870 break;
6d0b55c2 871
f757855e
LP		 872 case 'p':
873 r = expose_port_parse(&arg_expose_ports, optarg);
874 if (r == -EEXIST)
875 return log_error_errno(r, "Duplicate port specification: %s", optarg);
876 if (r < 0)
877 return log_error_errno(r, "Failed to parse host port %s: %m", optarg);
6d0b55c2 878
f757855e 879 arg_settings_mask |= SETTING_EXPOSE_PORTS;
6d0b55c2 880 break;
6d0b55c2 881
f36933fe
LP		 882 case ARG_PROPERTY:
883 if (strv_extend(&arg_property, optarg) < 0)
884 return log_oom();
885
886 break;
887
ae209204
ZJS		 888 case ARG_PRIVATE_USERS: {
889 int boolean = -1;
0de7acce 890
ae209204
ZJS		 891 if (!optarg)
892 boolean = true;
893 else if (!in_charset(optarg, DIGITS))
894 /* do *not* parse numbers as booleans */
895 boolean = parse_boolean(optarg);
896
897 if (boolean == false) {
0de7acce
LP		 898 /* no: User namespacing off */
899 arg_userns_mode = USER_NAMESPACE_NO;
900 arg_uid_shift = UID_INVALID;
901 arg_uid_range = UINT32_C(0x10000);
ae209204 902 } else if (boolean == true) {
0de7acce
LP		 903 /* yes: User namespacing on, UID range is read from root dir */
904 arg_userns_mode = USER_NAMESPACE_FIXED;
905 arg_uid_shift = UID_INVALID;
906 arg_uid_range = UINT32_C(0x10000);
907 } else if (streq(optarg, "pick")) {
908 /* pick: User namespacing on, UID range is picked randomly */
909 arg_userns_mode = USER_NAMESPACE_PICK;
910 arg_uid_shift = UID_INVALID;
911 arg_uid_range = UINT32_C(0x10000);
912 } else {
6c2058b3 913 _cleanup_free_ char *buffer = NULL;
6dac160c
LP		 914 const char *range, *shift;
915
0de7acce
LP		 916 /* anything else: User namespacing on, UID range is explicitly configured */
917
6dac160c
LP		 918 range = strchr(optarg, ':');
919 if (range) {
6c2058b3
ZJS		 920 buffer = strndup(optarg, range - optarg);
921 if (!buffer)
922 return log_oom();
923 shift = buffer;
6dac160c
LP		 924
925 range++;
bfd292ec
ZJS		 926 r = safe_atou32(range, &arg_uid_range);
927 if (r < 0)
be715731 928 return log_error_errno(r, "Failed to parse UID range \"%s\": %m", range);
6dac160c
LP		 929 } else
930 shift = optarg;
931
be715731
ZJS		 932 r = parse_uid(shift, &arg_uid_shift);
933 if (r < 0)
934 return log_error_errno(r, "Failed to parse UID \"%s\": %m", optarg);
0de7acce
LP		 935
936 arg_userns_mode = USER_NAMESPACE_FIXED;
6dac160c
LP		 937 }
938
be715731
ZJS		 939 if (arg_uid_range <= 0) {
940 log_error("UID range cannot be 0.");
941 return -EINVAL;
942 }
943
0de7acce 944 arg_settings_mask |= SETTING_USERNS;
6dac160c 945 break;
ae209204 946 }
6dac160c 947
0de7acce 948 case 'U':
ccabee0d
LP		 949 if (userns_supported()) {
950 arg_userns_mode = USER_NAMESPACE_PICK;
951 arg_uid_shift = UID_INVALID;
952 arg_uid_range = UINT32_C(0x10000);
953
954 arg_settings_mask |= SETTING_USERNS;
6dac160c
LP		 955 }
956
7336138e
LP		 957 break;
958
0de7acce 959 case ARG_PRIVATE_USERS_CHOWN:
19aac838 960 arg_userns_chown = true;
0de7acce
LP		 961
962 arg_settings_mask |= SETTING_USERNS;
6dac160c
LP		 963 break;
964
c6c8f6e2
LP		 965 case ARG_KILL_SIGNAL:
966 arg_kill_signal = signal_from_string_try_harder(optarg);
967 if (arg_kill_signal < 0) {
968 log_error("Cannot parse signal: %s", optarg);
969 return -EINVAL;
970 }
971
f757855e
LP		 972 arg_settings_mask |= SETTING_KILL_SIGNAL;
973 break;
974
975 case ARG_SETTINGS:
976
977 /* no → do not read files
978 * yes → read files, do not override cmdline, trust only subset
979 * override → read files, override cmdline, trust only subset
980 * trusted → read files, do not override cmdline, trust all
981 */
982
983 r = parse_boolean(optarg);
984 if (r < 0) {
985 if (streq(optarg, "trusted")) {
986 mask_all_settings = false;
987 mask_no_settings = false;
988 arg_settings_trusted = true;
989
990 } else if (streq(optarg, "override")) {
991 mask_all_settings = false;
992 mask_no_settings = true;
993 arg_settings_trusted = -1;
994 } else
995 return log_error_errno(r, "Failed to parse --settings= argument: %s", optarg);
996 } else if (r > 0) {
997 /* yes */
998 mask_all_settings = false;
999 mask_no_settings = false;
1000 arg_settings_trusted = -1;
1001 } else {
1002 /* no */
1003 mask_all_settings = true;
1004 mask_no_settings = false;
1005 arg_settings_trusted = false;
1006 }
1007
c6c8f6e2
LP		 1008 break;
1009
5f932eb9
LP		 1010 case ARG_CHDIR:
1011 if (!path_is_absolute(optarg)) {
1012 log_error("Working directory %s is not an absolute path.", optarg);
1013 return -EINVAL;
1014 }
1015
1016 r = free_and_strdup(&arg_chdir, optarg);
1017 if (r < 0)
1018 return log_oom();
1019
1020 arg_settings_mask |= SETTING_WORKING_DIRECTORY;
1021 break;
1022
b53ede69
PW		 1023 case ARG_PIVOT_ROOT:
1024 r = pivot_root_parse(&arg_pivot_root_new, &arg_pivot_root_old, optarg);
1025 if (r < 0)
1026 return log_error_errno(r, "Failed to parse --pivot-root= argument %s: %m", optarg);
1027
1028 arg_settings_mask |= SETTING_PIVOT_ROOT;
1029 break;
1030
9c1e04d0
AP		 1031 case ARG_NOTIFY_READY:
1032 r = parse_boolean(optarg);
1033 if (r < 0) {
1034 log_error("%s is not a valid notify mode. Valid modes are: yes, no, and ready.", optarg);
1035 return -EINVAL;
1036 }
1037 arg_notify_ready = r;
1038 arg_settings_mask |= SETTING_NOTIFY_READY;
1039 break;
1040
4623e8e6
LP		 1041 case ARG_ROOT_HASH: {
1042 void *k;
1043 size_t l;
1044
1045 r = unhexmem(optarg, strlen(optarg), &k, &l);
1046 if (r < 0)
1047 return log_error_errno(r, "Failed to parse root hash: %s", optarg);
1048 if (l < sizeof(sd_id128_t)) {
1049 log_error("Root hash must be at least 128bit long: %s", optarg);
1050 free(k);
1051 return -EINVAL;
1052 }
1053
1054 free(arg_root_hash);
1055 arg_root_hash = k;
1056 arg_root_hash_size = l;
1057 break;
1058 }
1059
960e4569
LP		 1060 case ARG_SYSTEM_CALL_FILTER: {
1061 bool negative;
1062 const char *items;
1063
1064 negative = optarg[0] == '~';
1065 items = negative ? optarg + 1 : optarg;
1066
1067 for (;;) {
1068 _cleanup_free_ char *word = NULL;
1069
1070 r = extract_first_word(&items, &word, NULL, 0);
1071 if (r == 0)
1072 break;
1073 if (r == -ENOMEM)
1074 return log_oom();
1075 if (r < 0)
1076 return log_error_errno(r, "Failed to parse system call filter: %m");
1077
1078 if (negative)
1079 r = strv_extend(&arg_syscall_blacklist, word);
1080 else
1081 r = strv_extend(&arg_syscall_whitelist, word);
1082 if (r < 0)
1083 return log_oom();
1084 }
1085
1086 arg_settings_mask |= SETTING_SYSCALL_FILTER;
1087 break;
1088 }
1089
88213476
LP		 1090 case '?':
1091 return -EINVAL;
1092
1093 default:
eb9da376 1094 assert_not_reached("Unhandled option");
88213476 1095 }
88213476 1096
0c582db0
LB		 1097 parse_share_ns_env("SYSTEMD_NSPAWN_SHARE_NS_IPC", CLONE_NEWIPC);
1098 parse_share_ns_env("SYSTEMD_NSPAWN_SHARE_NS_PID", CLONE_NEWPID);
1099 parse_share_ns_env("SYSTEMD_NSPAWN_SHARE_NS_UTS", CLONE_NEWUTS);
1100 parse_share_ns_env("SYSTEMD_NSPAWN_SHARE_SYSTEM", CLONE_NEWIPC|CLONE_NEWPID|CLONE_NEWUTS);
a6b5216c 1101
4f086aab
SU		 1102 if (arg_userns_mode != USER_NAMESPACE_NO)
1103 arg_mount_settings |= MOUNT_USE_USERNS;
1104
1105 if (arg_private_network)
1106 arg_mount_settings |= MOUNT_APPLY_APIVFS_NETNS;
1107
1108 parse_mount_settings_env();
1109
48a8d337
LB		 1110 if (!(arg_clone_ns_flags & CLONE_NEWPID) ||
1111 !(arg_clone_ns_flags & CLONE_NEWUTS)) {
eb91eb18 1112 arg_register = false;
0c582db0
LB		 1113 if (arg_start_mode != START_PID1) {
1114 log_error("--boot cannot be used without namespacing.");
1115 return -EINVAL;
1116 }
1117 }
eb91eb18 1118
0de7acce 1119 if (arg_userns_mode == USER_NAMESPACE_PICK)
0e7ac751
LP		 1120 arg_userns_chown = true;
1121
cd2dfc6f
LP		 1122 if (arg_keep_unit && arg_register && cg_pid_get_owner_uid(0, NULL) >= 0) {
1123 log_error("--keep-unit --register=yes may not be used when invoked from a user session.");
89f7c846
LP		 1124 return -EINVAL;
1125 }
1126
1b9e5b12
LP		 1127 if (arg_directory && arg_image) {
1128 log_error("--directory= and --image= may not be combined.");
1129 return -EINVAL;
1130 }
1131
ec16945e
LP		 1132 if (arg_template && arg_image) {
1133 log_error("--template= and --image= may not be combined.");
1134 return -EINVAL;
1135 }
1136
8cd328d8
LP		 1137 if (arg_ephemeral && arg_template && !arg_directory) {
1138 /* User asked for ephemeral execution but specified --template= instead of --directory=. Semantically
1139 * such an invocation makes some sense, see https://github.com/systemd/systemd/issues/3667. Let's
1140 * accept this here, and silently make "--ephemeral --template=" equivalent to "--ephemeral
1141 * --directory=". */
1142
1143 arg_directory = arg_template;
1144 arg_template = NULL;
1145 }
1146
ec16945e
LP		 1147 if (arg_template && !(arg_directory || arg_machine)) {
1148 log_error("--template= needs --directory= or --machine=.");
1149 return -EINVAL;
1150 }
1151
1152 if (arg_ephemeral && arg_template) {
1153 log_error("--ephemeral and --template= may not be combined.");
1154 return -EINVAL;
1155 }
1156
df9a75e4
LP		 1157 if (arg_ephemeral && !IN_SET(arg_link_journal, LINK_NO, LINK_AUTO)) {
1158 log_error("--ephemeral and --link-journal= may not be combined.");
1159 return -EINVAL;
1160 }
1161
ccabee0d 1162 if (arg_userns_mode != USER_NAMESPACE_NO && !userns_supported()) {
7336138e
LP		 1163 log_error("--private-users= is not supported, kernel compiled without user namespace support.");
1164 return -EOPNOTSUPP;
1165 }
1166
1167 if (arg_userns_chown && arg_read_only) {
1168 log_error("--read-only and --private-users-chown may not be combined.");
1169 return -EINVAL;
1170 }
f757855e 1171
22b28dfd
LP		 1172 if (arg_network_bridge && arg_network_zone) {
1173 log_error("--network-bridge= and --network-zone= may not be combined.");
1174 return -EINVAL;
1175 }
1176
f757855e
LP		 1177 if (argc > optind) {
1178 arg_parameters = strv_copy(argv + optind);
1179 if (!arg_parameters)
1180 return log_oom();
1181
7732f92b 1182 arg_settings_mask |= SETTING_START_MODE;
f757855e
LP		 1183 }
1184
1185 /* Load all settings from .nspawn files */
1186 if (mask_no_settings)
1187 arg_settings_mask = 0;
1188
1189 /* Don't load any settings from .nspawn files */
1190 if (mask_all_settings)
1191 arg_settings_mask = _SETTINGS_MASK_ALL;
1192
520e0d54 1193 arg_caps_retain = (arg_caps_retain | plus | (arg_private_network ? 1ULL << CAP_NET_ADMIN : 0)) & ~minus;
f757855e 1194
399e391f
ZJS		 1195 r = cg_unified_flush();
1196 if (r < 0)
1197 return log_error_errno(r, "Failed to determine whether the unified cgroups hierarchy is used: %m");
1198
6aadfa4c
ILG		 1199 e = getenv("SYSTEMD_NSPAWN_CONTAINER_SERVICE");
1200 if (e)
1201 arg_container_service_name = e;
1202
5a8ff0e6
CB		 1203 r = getenv_bool("SYSTEMD_NSPAWN_USE_CGNS");
1204 if (r < 0)
1205 arg_use_cgns = cg_ns_supported();
1206 else
1207 arg_use_cgns = r;
1208
86c0dd4a
LP		 1209 r = custom_mount_check_all();
1210 if (r < 0)
1211 return r;
1212
f757855e
LP		 1213 return 1;
1214}
1215
1216static int verify_arguments(void) {
4f086aab
SU		 1217 if (arg_userns_mode != USER_NAMESPACE_NO && (arg_mount_settings & MOUNT_APPLY_APIVFS_NETNS) && !arg_private_network) {
1218 log_error("Invalid namespacing settings. Mounting sysfs with --private-users requires --private-network.");
1219 return -EINVAL;
1220 }
1221
1222 if (arg_userns_mode != USER_NAMESPACE_NO && !(arg_mount_settings & MOUNT_APPLY_APIVFS_RO)) {
1223 log_error("Cannot combine --private-users with read-write mounts.");
1224 return -EINVAL;
1225 }
f757855e
LP		 1226
1227 if (arg_volatile_mode != VOLATILE_NO && arg_read_only) {
4d9f07b4
LP		 1228 log_error("Cannot combine --read-only with --volatile. Note that --volatile already implies a read-only base hierarchy.");
1229 return -EINVAL;
1230 }
1231
6d0b55c2
LP		 1232 if (arg_expose_ports && !arg_private_network) {
1233 log_error("Cannot use --port= without private networking.");
1234 return -EINVAL;
1235 }
1236
1c1ea217
EV		 1237#ifndef HAVE_LIBIPTC
1238 if (arg_expose_ports) {
1239 log_error("--port= is not supported, compiled without libiptc support.");
1240 return -EOPNOTSUPP;
1241 }
1242#endif
1243
7732f92b 1244 if (arg_start_mode == START_BOOT && arg_kill_signal <= 0)
c6c8f6e2
LP		 1245 arg_kill_signal = SIGRTMIN+3;
1246
f757855e 1247 return 0;
88213476
LP		 1248}
1249
03cfe0d5
LP		 1250static int userns_lchown(const char *p, uid_t uid, gid_t gid) {
1251 assert(p);
1252
0de7acce 1253 if (arg_userns_mode == USER_NAMESPACE_NO)
03cfe0d5
LP		 1254 return 0;
1255
1256 if (uid == UID_INVALID && gid == GID_INVALID)
1257 return 0;
1258
1259 if (uid != UID_INVALID) {
1260 uid += arg_uid_shift;
1261
1262 if (uid < arg_uid_shift || uid >= arg_uid_shift + arg_uid_range)
1263 return -EOVERFLOW;
1264 }
1265
1266 if (gid != GID_INVALID) {
1267 gid += (gid_t) arg_uid_shift;
1268
1269 if (gid < (gid_t) arg_uid_shift || gid >= (gid_t) (arg_uid_shift + arg_uid_range))
1270 return -EOVERFLOW;
1271 }
1272
1273 if (lchown(p, uid, gid) < 0)
1274 return -errno;
b12afc8c
LP		 1275
1276 return 0;
1277}
1278
03cfe0d5
LP		 1279static int userns_mkdir(const char *root, const char *path, mode_t mode, uid_t uid, gid_t gid) {
1280 const char *q;
1281
1282 q = prefix_roota(root, path);
1283 if (mkdir(q, mode) < 0) {
1284 if (errno == EEXIST)
1285 return 0;
1286 return -errno;
1287 }
1288
1289 return userns_lchown(q, uid, gid);
1290}
1291
e58a1277 1292static int setup_timezone(const char *dest) {
03cfe0d5
LP		 1293 _cleanup_free_ char *p = NULL, *q = NULL;
1294 const char *where, *check, *what;
d4036145
LP		 1295 char *z, *y;
1296 int r;
f8440af5 1297
e58a1277
LP		 1298 assert(dest);
1299
1300 /* Fix the timezone, if possible */
d4036145
LP		 1301 r = readlink_malloc("/etc/localtime", &p);
1302 if (r < 0) {
0b493a02
MP		 1303 log_warning("host's /etc/localtime is not a symlink, not updating container timezone.");
1304 /* to handle warning, delete /etc/localtime and replace it
d23a0044 1305 * with a symbolic link to a time zone data file.
0b493a02
MP		 1306 *
1307 * Example:
21dc0227 1308 * ln -s /usr/share/zoneinfo/UTC /etc/localtime
0b493a02 1309 */
d4036145
LP		 1310 return 0;
1311 }
1312
1313 z = path_startswith(p, "../usr/share/zoneinfo/");
1314 if (!z)
1315 z = path_startswith(p, "/usr/share/zoneinfo/");
1316 if (!z) {
1317 log_warning("/etc/localtime does not point into /usr/share/zoneinfo/, not updating container timezone.");
1318 return 0;
1319 }
1320
03cfe0d5 1321 where = prefix_roota(dest, "/etc/localtime");
d4036145
LP		 1322 r = readlink_malloc(where, &q);
1323 if (r >= 0) {
1324 y = path_startswith(q, "../usr/share/zoneinfo/");
1325 if (!y)
1326 y = path_startswith(q, "/usr/share/zoneinfo/");
4d1c38b8 1327
d4036145
LP		 1328 /* Already pointing to the right place? Then do nothing .. */
1329 if (y && streq(y, z))
1330 return 0;
1331 }
1332
03cfe0d5 1333 check = strjoina("/usr/share/zoneinfo/", z);
61e741ed 1334 check = prefix_roota(dest, check);
03cfe0d5 1335 if (laccess(check, F_OK) < 0) {
d4036145
LP		 1336 log_warning("Timezone %s does not exist in container, not updating container timezone.", z);
1337 return 0;
1338 }
68fb0892 1339
8ccf7e9e
LP		 1340 if (unlink(where) < 0 && errno != ENOENT) {
1341 log_full_errno(IN_SET(errno, EROFS, EACCES, EPERM) ? LOG_DEBUG : LOG_WARNING, /* Don't complain on read-only images */
1342 errno,
1343 "Failed to remove existing timezone info %s in container, ignoring: %m", where);
79d80fc1
TG		 1344 return 0;
1345 }
4d9f07b4 1346
03cfe0d5 1347 what = strjoina("../usr/share/zoneinfo/", z);
d4036145 1348 if (symlink(what, where) < 0) {
8ccf7e9e
LP		 1349 log_full_errno(IN_SET(errno, EROFS, EACCES, EPERM) ? LOG_DEBUG : LOG_WARNING,
1350 errno,
1351 "Failed to correct timezone of container, ignoring: %m");
d4036145
LP		 1352 return 0;
1353 }
e58a1277 1354
03cfe0d5
LP		 1355 r = userns_lchown(where, 0, 0);
1356 if (r < 0)
1357 return log_warning_errno(r, "Failed to chown /etc/localtime: %m");
1358
e58a1277 1359 return 0;
88213476
LP		 1360}
1361
7357272e 1362static int resolved_listening(void) {
b053cd5f 1363 _cleanup_(sd_bus_flush_close_unrefp) sd_bus *bus = NULL;
7357272e 1364 _cleanup_free_ char *dns_stub_listener_mode = NULL;
b053cd5f
LP		 1365 int r;
1366
7357272e 1367 /* Check if resolved is listening */
b053cd5f
LP		 1368
1369 r = sd_bus_open_system(&bus);
1370 if (r < 0)
1371 return r;
1372
7357272e
DM		 1373 r = bus_name_has_owner(bus, "org.freedesktop.resolve1", NULL);
1374 if (r <= 0)
1375 return r;
1376
1377 r = sd_bus_get_property_string(bus,
1378 "org.freedesktop.resolve1",
1379 "/org/freedesktop/resolve1",
1380 "org.freedesktop.resolve1.Manager",
1381 "DNSStubListener",
1382 NULL,
1383 &dns_stub_listener_mode);
1384 if (r < 0)
1385 return r;
1386
1387 return STR_IN_SET(dns_stub_listener_mode, "udp", "yes");
b053cd5f
LP		 1388}
1389
2547bb41 1390static int setup_resolv_conf(const char *dest) {
87447ae4
LP		 1391 _cleanup_free_ char *resolved = NULL, *etc = NULL;
1392 const char *where;
1393 int r, found;
2547bb41
LP		 1394
1395 assert(dest);
1396
1397 if (arg_private_network)
1398 return 0;
1399
87447ae4
LP		 1400 r = chase_symlinks("/etc", dest, CHASE_PREFIX_ROOT, &etc);
1401 if (r < 0) {
1402 log_warning_errno(r, "Failed to resolve /etc path in container, ignoring: %m");
1403 return 0;
1404 }
1405
1406 where = strjoina(etc, "/resolv.conf");
1407 found = chase_symlinks(where, dest, CHASE_NONEXISTENT, &resolved);
1408 if (found < 0) {
1409 log_warning_errno(found, "Failed to resolve /etc/resolv.conf path in container, ignoring: %m");
1410 return 0;
1411 }
79d80fc1 1412
b053cd5f 1413 if (access("/usr/lib/systemd/resolv.conf", F_OK) >= 0 &&
7357272e 1414 resolved_listening() > 0) {
87447ae4 1415
3539724c
LP		 1416 /* resolved is enabled on the host. In this, case bind mount its static resolv.conf file into the
1417 * container, so that the container can use the host's resolver. Given that network namespacing is
1418 * disabled it's only natural of the container also uses the host's resolver. It also has the big
1419 * advantage that the container will be able to follow the host's DNS server configuration changes
1420 * transparently. */
1421
87447ae4
LP		 1422 if (found == 0) /* missing? */
1423 (void) touch(resolved);
5367354d 1424
87447ae4 1425 r = mount_verbose(LOG_DEBUG, "/usr/lib/systemd/resolv.conf", resolved, NULL, MS_BIND, NULL);
60e76d48 1426 if (r >= 0)
87447ae4 1427 return mount_verbose(LOG_ERR, NULL, resolved, NULL, MS_BIND|MS_REMOUNT|MS_RDONLY|MS_NOSUID|MS_NODEV, NULL);
3539724c
LP		 1428 }
1429
1430 /* If that didn't work, let's copy the file */
1c876927 1431 r = copy_file("/etc/resolv.conf", where, O_TRUNC|O_NOFOLLOW, 0644, 0, COPY_REFLINK);
79d80fc1 1432 if (r < 0) {
3539724c
LP		 1433 /* If the file already exists as symlink, let's suppress the warning, under the assumption that
1434 * resolved or something similar runs inside and the symlink points there.
68a313c5 1435 *
3539724c 1436 * If the disk image is read-only, there's also no point in complaining.
68a313c5 1437 */
87447ae4 1438 log_full_errno(IN_SET(r, -ELOOP, -EROFS, -EACCES, -EPERM) ? LOG_DEBUG : LOG_WARNING, r,
3539724c 1439 "Failed to copy /etc/resolv.conf to %s, ignoring: %m", where);
79d80fc1
TG		 1440 return 0;
1441 }
2547bb41 1442
03cfe0d5
LP		 1443 r = userns_lchown(where, 0, 0);
1444 if (r < 0)
3539724c 1445 log_warning_errno(r, "Failed to chown /etc/resolv.conf, ignoring: %m");
03cfe0d5 1446
2547bb41
LP		 1447 return 0;
1448}
1449
04bc4a3f 1450static int setup_boot_id(const char *dest) {
3bbaff3e 1451 sd_id128_t rnd = SD_ID128_NULL;
03cfe0d5 1452 const char *from, *to;
04bc4a3f
LP		 1453 int r;
1454
04bc4a3f
LP		 1455 /* Generate a new randomized boot ID, so that each boot-up of
1456 * the container gets a new one */
1457
03cfe0d5
LP		 1458 from = prefix_roota(dest, "/run/proc-sys-kernel-random-boot-id");
1459 to = prefix_roota(dest, "/proc/sys/kernel/random/boot_id");
04bc4a3f
LP		 1460
1461 r = sd_id128_randomize(&rnd);
f647962d
MS		 1462 if (r < 0)
1463 return log_error_errno(r, "Failed to generate random boot id: %m");
04bc4a3f 1464
15b1248a 1465 r = id128_write(from, ID128_UUID, rnd, false);
f647962d
MS		 1466 if (r < 0)
1467 return log_error_errno(r, "Failed to write boot id: %m");
04bc4a3f 1468
60e76d48
ZJS		 1469 r = mount_verbose(LOG_ERR, from, to, NULL, MS_BIND, NULL);
1470 if (r >= 0)
1471 r = mount_verbose(LOG_ERR, NULL, to, NULL,
1472 MS_BIND|MS_REMOUNT|MS_RDONLY|MS_NOSUID|MS_NODEV, NULL);
04bc4a3f 1473
3bbaff3e 1474 (void) unlink(from);
04bc4a3f
LP		 1475 return r;
1476}
1477
e58a1277 1478static int copy_devnodes(const char *dest) {
88213476
LP		 1479
1480 static const char devnodes[] =
1481 "null\0"
1482 "zero\0"
1483 "full\0"
1484 "random\0"
1485 "urandom\0"
85614d66
TG		 1486 "tty\0"
1487 "net/tun\0";
88213476
LP		 1488
1489 const char *d;
e58a1277 1490 int r = 0;
7fd1b19b 1491 _cleanup_umask_ mode_t u;
a258bf26
LP		 1492
1493 assert(dest);
124640f1
LP		 1494
1495 u = umask(0000);
88213476 1496
03cfe0d5
LP		 1497 /* Create /dev/net, so that we can create /dev/net/tun in it */
1498 if (userns_mkdir(dest, "/dev/net", 0755, 0, 0) < 0)
1499 return log_error_errno(r, "Failed to create /dev/net directory: %m");
1500
88213476 1501 NULSTR_FOREACH(d, devnodes) {
7fd1b19b 1502 _cleanup_free_ char *from = NULL, *to = NULL;
7f112f50 1503 struct stat st;
88213476 1504
7f112f50 1505 from = strappend("/dev/", d);
03cfe0d5 1506 to = prefix_root(dest, from);
88213476
LP		 1507
1508 if (stat(from, &st) < 0) {
1509
4a62c710
MS		 1510 if (errno != ENOENT)
1511 return log_error_errno(errno, "Failed to stat %s: %m", from);
88213476 1512
a258bf26 1513 } else if (!S_ISCHR(st.st_mode) && !S_ISBLK(st.st_mode)) {
88213476 1514
03cfe0d5 1515 log_error("%s is not a char or block device, cannot copy.", from);
7f112f50 1516 return -EIO;
a258bf26 1517
85614d66 1518 } else {
81f5049b 1519 if (mknod(to, st.st_mode, st.st_rdev) < 0) {
8dbf71ec 1520 /* Explicitly warn the user when /dev is already populated. */
41eb4362 1521 if (errno == EEXIST)
8dbf71ec 1522 log_notice("%s/dev is pre-mounted and pre-populated. If a pre-mounted /dev is provided it needs to be an unpopulated file system.", dest);
81f5049b
AC		 1523 if (errno != EPERM)
1524 return log_error_errno(errno, "mknod(%s) failed: %m", to);
1525
1526 /* Some systems abusively restrict mknod but
1527 * allow bind mounts. */
1528 r = touch(to);
1529 if (r < 0)
1530 return log_error_errno(r, "touch (%s) failed: %m", to);
60e76d48
ZJS		 1531 r = mount_verbose(LOG_DEBUG, from, to, NULL, MS_BIND, NULL);
1532 if (r < 0)
1533 return log_error_errno(r, "Both mknod and bind mount (%s) failed: %m", to);
81f5049b 1534 }
6278cf60 1535
03cfe0d5
LP		 1536 r = userns_lchown(to, 0, 0);
1537 if (r < 0)
1538 return log_error_errno(r, "chown() of device node %s failed: %m", to);
88213476 1539 }
88213476
LP		 1540 }
1541
e58a1277
LP		 1542 return r;
1543}
88213476 1544
03cfe0d5
LP		 1545static int setup_pts(const char *dest) {
1546 _cleanup_free_ char *options = NULL;
1547 const char *p;
709f6e46 1548 int r;
03cfe0d5
LP		 1549
1550#ifdef HAVE_SELINUX
1551 if (arg_selinux_apifs_context)
1552 (void) asprintf(&options,
3dce8915 1553 "newinstance,ptmxmode=0666,mode=620,gid=" GID_FMT ",context=\"%s\"",
03cfe0d5
LP		 1554 arg_uid_shift + TTY_GID,
1555 arg_selinux_apifs_context);
1556 else
1557#endif
1558 (void) asprintf(&options,
3dce8915 1559 "newinstance,ptmxmode=0666,mode=620,gid=" GID_FMT,
03cfe0d5 1560 arg_uid_shift + TTY_GID);
f2d88580 1561
03cfe0d5 1562 if (!options)
f2d88580
LP		 1563 return log_oom();
1564
03cfe0d5 1565 /* Mount /dev/pts itself */
cc9fce65 1566 p = prefix_roota(dest, "/dev/pts");
03cfe0d5
LP		 1567 if (mkdir(p, 0755) < 0)
1568 return log_error_errno(errno, "Failed to create /dev/pts: %m");
60e76d48
ZJS		 1569 r = mount_verbose(LOG_ERR, "devpts", p, "devpts", MS_NOSUID|MS_NOEXEC, options);
1570 if (r < 0)
1571 return r;
709f6e46
MS		 1572 r = userns_lchown(p, 0, 0);
1573 if (r < 0)
1574 return log_error_errno(r, "Failed to chown /dev/pts: %m");
03cfe0d5
LP		 1575
1576 /* Create /dev/ptmx symlink */
1577 p = prefix_roota(dest, "/dev/ptmx");
4a62c710
MS		 1578 if (symlink("pts/ptmx", p) < 0)
1579 return log_error_errno(errno, "Failed to create /dev/ptmx symlink: %m");
709f6e46
MS		 1580 r = userns_lchown(p, 0, 0);
1581 if (r < 0)
1582 return log_error_errno(r, "Failed to chown /dev/ptmx: %m");
f2d88580 1583
03cfe0d5
LP		 1584 /* And fix /dev/pts/ptmx ownership */
1585 p = prefix_roota(dest, "/dev/pts/ptmx");
709f6e46
MS		 1586 r = userns_lchown(p, 0, 0);
1587 if (r < 0)
1588 return log_error_errno(r, "Failed to chown /dev/pts/ptmx: %m");
6278cf60 1589
f2d88580
LP		 1590 return 0;
1591}
1592
e58a1277 1593static int setup_dev_console(const char *dest, const char *console) {
eb0f0863
LP		 1594 _cleanup_umask_ mode_t u;
1595 const char *to;
e58a1277 1596 int r;
e58a1277
LP		 1597
1598 assert(dest);
1599 assert(console);
1600
1601 u = umask(0000);
1602
03cfe0d5 1603 r = chmod_and_chown(console, 0600, arg_uid_shift, arg_uid_shift);
f647962d
MS		 1604 if (r < 0)
1605 return log_error_errno(r, "Failed to correct access mode for TTY: %m");
88213476 1606
a258bf26
LP		 1607 /* We need to bind mount the right tty to /dev/console since
1608 * ptys can only exist on pts file systems. To have something
81f5049b 1609 * to bind mount things on we create a empty regular file. */
a258bf26 1610
03cfe0d5 1611 to = prefix_roota(dest, "/dev/console");
81f5049b
AC		 1612 r = touch(to);
1613 if (r < 0)
1614 return log_error_errno(r, "touch() for /dev/console failed: %m");
a258bf26 1615
60e76d48 1616 return mount_verbose(LOG_ERR, console, to, NULL, MS_BIND, NULL);
e58a1277
LP		 1617}
1618
1619static int setup_kmsg(const char *dest, int kmsg_socket) {
03cfe0d5 1620 const char *from, *to;
7fd1b19b 1621 _cleanup_umask_ mode_t u;
d9603714 1622 int fd, r;
e58a1277 1623
e58a1277 1624 assert(kmsg_socket >= 0);
a258bf26 1625
e58a1277 1626 u = umask(0000);
a258bf26 1627
03cfe0d5 1628 /* We create the kmsg FIFO as /run/kmsg, but immediately
f1e5dfe2
LP		 1629 * delete it after bind mounting it to /proc/kmsg. While FIFOs
1630 * on the reading side behave very similar to /proc/kmsg,
1631 * their writing side behaves differently from /dev/kmsg in
1632 * that writing blocks when nothing is reading. In order to
1633 * avoid any problems with containers deadlocking due to this
1634 * we simply make /dev/kmsg unavailable to the container. */
03cfe0d5
LP		 1635 from = prefix_roota(dest, "/run/kmsg");
1636 to = prefix_roota(dest, "/proc/kmsg");
e58a1277 1637
4a62c710 1638 if (mkfifo(from, 0600) < 0)
03cfe0d5 1639 return log_error_errno(errno, "mkfifo() for /run/kmsg failed: %m");
60e76d48
ZJS		 1640 r = mount_verbose(LOG_ERR, from, to, NULL, MS_BIND, NULL);
1641 if (r < 0)
1642 return r;
e58a1277
LP		 1643
1644 fd = open(from, O_RDWR|O_NDELAY|O_CLOEXEC);
4a62c710
MS		 1645 if (fd < 0)
1646 return log_error_errno(errno, "Failed to open fifo: %m");
e58a1277 1647
e58a1277
LP		 1648 /* Store away the fd in the socket, so that it stays open as
1649 * long as we run the child */
3ee897d6 1650 r = send_one_fd(kmsg_socket, fd, 0);
03e334a1 1651 safe_close(fd);
e58a1277 1652
d9603714
DH		 1653 if (r < 0)
1654 return log_error_errno(r, "Failed to send FIFO fd: %m");
a258bf26 1655
03cfe0d5
LP		 1656 /* And now make the FIFO unavailable as /run/kmsg... */
1657 (void) unlink(from);
1658
25ea79fe 1659 return 0;
88213476
LP		 1660}
1661
1c4baffc 1662static int on_address_change(sd_netlink *rtnl, sd_netlink_message *m, void *userdata) {
6d0b55c2
LP		 1663 union in_addr_union *exposed = userdata;
1664
1665 assert(rtnl);
1666 assert(m);
1667 assert(exposed);
1668
7a8f6325 1669 expose_port_execute(rtnl, arg_expose_ports, exposed);
6d0b55c2
LP		 1670 return 0;
1671}
1672
3a74cea5 1673static int setup_hostname(void) {
3a74cea5 1674
0c582db0 1675 if ((arg_clone_ns_flags & CLONE_NEWUTS) == 0)
eb91eb18
LP		 1676 return 0;
1677
605f81a8 1678 if (sethostname_idempotent(arg_machine) < 0)
7027ff61 1679 return -errno;
3a74cea5 1680
7027ff61 1681 return 0;
3a74cea5
LP		 1682}
1683
57fb9fb5 1684static int setup_journal(const char *directory) {
e01ff70a 1685 sd_id128_t this_id;
0f5e1382 1686 _cleanup_free_ char *d = NULL;
e01ff70a 1687 const char *p, *q;
8054d749 1688 bool try;
e01ff70a 1689 char id[33];
57fb9fb5
LP		 1690 int r;
1691
df9a75e4
LP		 1692 /* Don't link journals in ephemeral mode */
1693 if (arg_ephemeral)
1694 return 0;
1695
8054d749
LP		 1696 if (arg_link_journal == LINK_NO)
1697 return 0;
1698
1699 try = arg_link_journal_try || arg_link_journal == LINK_AUTO;
1700
4d680aee 1701 r = sd_id128_get_machine(&this_id);
f647962d
MS		 1702 if (r < 0)
1703 return log_error_errno(r, "Failed to retrieve machine ID: %m");
4d680aee 1704
e01ff70a 1705 if (sd_id128_equal(arg_uuid, this_id)) {
8054d749 1706 log_full(try ? LOG_WARNING : LOG_ERR,
e192a281 1707 "Host and machine ids are equal (%s): refusing to link journals", sd_id128_to_string(arg_uuid, id));
8054d749 1708 if (try)
4d680aee 1709 return 0;
df9a75e4 1710 return -EEXIST;
4d680aee
ZJS		 1711 }
1712
03cfe0d5
LP		 1713 r = userns_mkdir(directory, "/var", 0755, 0, 0);
1714 if (r < 0)
1715 return log_error_errno(r, "Failed to create /var: %m");
1716
1717 r = userns_mkdir(directory, "/var/log", 0755, 0, 0);
1718 if (r < 0)
1719 return log_error_errno(r, "Failed to create /var/log: %m");
1720
1721 r = userns_mkdir(directory, "/var/log/journal", 0755, 0, 0);
1722 if (r < 0)
1723 return log_error_errno(r, "Failed to create /var/log/journal: %m");
1724
e01ff70a
MS		 1725 (void) sd_id128_to_string(arg_uuid, id);
1726
03cfe0d5
LP		 1727 p = strjoina("/var/log/journal/", id);
1728 q = prefix_roota(directory, p);
27407a01 1729
e1873695 1730 if (path_is_mount_point(p, NULL, 0) > 0) {
8054d749
LP		 1731 if (try)
1732 return 0;
27407a01 1733
8054d749
LP		 1734 log_error("%s: already a mount point, refusing to use for journal", p);
1735 return -EEXIST;
57fb9fb5
LP		 1736 }
1737
e1873695 1738 if (path_is_mount_point(q, NULL, 0) > 0) {
8054d749
LP		 1739 if (try)
1740 return 0;
57fb9fb5 1741
8054d749
LP		 1742 log_error("%s: already a mount point, refusing to use for journal", q);
1743 return -EEXIST;
57fb9fb5
LP		 1744 }
1745
1746 r = readlink_and_make_absolute(p, &d);
1747 if (r >= 0) {
1748 if ((arg_link_journal == LINK_GUEST ||
1749 arg_link_journal == LINK_AUTO) &&
1750 path_equal(d, q)) {
1751
03cfe0d5 1752 r = userns_mkdir(directory, p, 0755, 0, 0);
27407a01 1753 if (r < 0)
709f6e46 1754 log_warning_errno(r, "Failed to create directory %s: %m", q);
27407a01 1755 return 0;
57fb9fb5
LP		 1756 }
1757
4a62c710
MS		 1758 if (unlink(p) < 0)
1759 return log_error_errno(errno, "Failed to remove symlink %s: %m", p);
57fb9fb5
LP		 1760 } else if (r == -EINVAL) {
1761
1762 if (arg_link_journal == LINK_GUEST &&
1763 rmdir(p) < 0) {
1764
27407a01
ZJS		 1765 if (errno == ENOTDIR) {
1766 log_error("%s already exists and is neither a symlink nor a directory", p);
1767 return r;
4314d33f
MS		 1768 } else
1769 return log_error_errno(errno, "Failed to remove %s: %m", p);
57fb9fb5 1770 }
4314d33f
MS		 1771 } else if (r != -ENOENT)
1772 return log_error_errno(r, "readlink(%s) failed: %m", p);
57fb9fb5
LP		 1773
1774 if (arg_link_journal == LINK_GUEST) {
1775
1776 if (symlink(q, p) < 0) {
8054d749 1777 if (try) {
56f64d95 1778 log_debug_errno(errno, "Failed to symlink %s to %s, skipping journal setup: %m", q, p);
574edc90 1779 return 0;
4314d33f
MS		 1780 } else
1781 return log_error_errno(errno, "Failed to symlink %s to %s: %m", q, p);
57fb9fb5
LP		 1782 }
1783
03cfe0d5 1784 r = userns_mkdir(directory, p, 0755, 0, 0);
27407a01 1785 if (r < 0)
709f6e46 1786 log_warning_errno(r, "Failed to create directory %s: %m", q);
27407a01 1787 return 0;
57fb9fb5
LP		 1788 }
1789
1790 if (arg_link_journal == LINK_HOST) {
ccddd104 1791 /* don't create parents here — if the host doesn't have
574edc90 1792 * permanent journal set up, don't force it here */
ba8e6c4d
LP		 1793
1794 if (mkdir(p, 0755) < 0 && errno != EEXIST) {
8054d749 1795 if (try) {
56f64d95 1796 log_debug_errno(errno, "Failed to create %s, skipping journal setup: %m", p);
574edc90 1797 return 0;
4314d33f
MS		 1798 } else
1799 return log_error_errno(errno, "Failed to create %s: %m", p);
57fb9fb5
LP		 1800 }
1801
27407a01
ZJS		 1802 } else if (access(p, F_OK) < 0)
1803 return 0;
57fb9fb5 1804
cdb2b9d0
LP		 1805 if (dir_is_empty(q) == 0)
1806 log_warning("%s is not empty, proceeding anyway.", q);
1807
03cfe0d5 1808 r = userns_mkdir(directory, p, 0755, 0, 0);
709f6e46
MS		 1809 if (r < 0)
1810 return log_error_errno(r, "Failed to create %s: %m", q);
57fb9fb5 1811
60e76d48
ZJS		 1812 r = mount_verbose(LOG_DEBUG, p, q, NULL, MS_BIND, NULL);
1813 if (r < 0)
4a62c710 1814 return log_error_errno(errno, "Failed to bind mount journal from host into guest: %m");
57fb9fb5 1815
27407a01 1816 return 0;
57fb9fb5
LP		 1817}
1818
88213476 1819static int drop_capabilities(void) {
520e0d54 1820 return capability_bounding_set_drop(arg_caps_retain, false);
88213476
LP		 1821}
1822
db999e0f
LP		 1823static int reset_audit_loginuid(void) {
1824 _cleanup_free_ char *p = NULL;
1825 int r;
1826
0c582db0 1827 if ((arg_clone_ns_flags & CLONE_NEWPID) == 0)
db999e0f
LP		 1828 return 0;
1829
1830 r = read_one_line_file("/proc/self/loginuid", &p);
13e8ceb8 1831 if (r == -ENOENT)
db999e0f 1832 return 0;
f647962d
MS		 1833 if (r < 0)
1834 return log_error_errno(r, "Failed to read /proc/self/loginuid: %m");
db999e0f
LP		 1835
1836 /* Already reset? */
1837 if (streq(p, "4294967295"))
1838 return 0;
1839
ad118bda 1840 r = write_string_file("/proc/self/loginuid", "4294967295", 0);
db999e0f 1841 if (r < 0) {
10a87006
LP		 1842 log_error_errno(r,
1843 "Failed to reset audit login UID. This probably means that your kernel is too\n"
1844 "old and you have audit enabled. Note that the auditing subsystem is known to\n"
1845 "be incompatible with containers on old kernels. Please make sure to upgrade\n"
1846 "your kernel or to off auditing with 'audit=0' on the kernel command line before\n"
1847 "using systemd-nspawn. Sleeping for 5s... (%m)");
77b6e194 1848
db999e0f 1849 sleep(5);
77b6e194 1850 }
db999e0f
LP		 1851
1852 return 0;
77b6e194
LP		 1853}
1854
24fb1112 1855
785890ac
LP		 1856static int setup_propagate(const char *root) {
1857 const char *p, *q;
709f6e46 1858 int r;
785890ac
LP		 1859
1860 (void) mkdir_p("/run/systemd/nspawn/", 0755);
1861 (void) mkdir_p("/run/systemd/nspawn/propagate", 0600);
63c372cb 1862 p = strjoina("/run/systemd/nspawn/propagate/", arg_machine);
785890ac
LP		 1863 (void) mkdir_p(p, 0600);
1864
709f6e46
MS		 1865 r = userns_mkdir(root, "/run/systemd", 0755, 0, 0);
1866 if (r < 0)
1867 return log_error_errno(r, "Failed to create /run/systemd: %m");
03cfe0d5 1868
709f6e46
MS		 1869 r = userns_mkdir(root, "/run/systemd/nspawn", 0755, 0, 0);
1870 if (r < 0)
1871 return log_error_errno(r, "Failed to create /run/systemd/nspawn: %m");
03cfe0d5 1872
709f6e46
MS		 1873 r = userns_mkdir(root, "/run/systemd/nspawn/incoming", 0600, 0, 0);
1874 if (r < 0)
1875 return log_error_errno(r, "Failed to create /run/systemd/nspawn/incoming: %m");
785890ac 1876
03cfe0d5 1877 q = prefix_roota(root, "/run/systemd/nspawn/incoming");
60e76d48
ZJS		 1878 r = mount_verbose(LOG_ERR, p, q, NULL, MS_BIND, NULL);
1879 if (r < 0)
1880 return r;
785890ac 1881
60e76d48
ZJS		 1882 r = mount_verbose(LOG_ERR, NULL, q, NULL, MS_BIND|MS_REMOUNT|MS_RDONLY, NULL);
1883 if (r < 0)
1884 return r;
785890ac 1885
19caffac
AC		 1886 /* machined will MS_MOVE into that directory, and that's only
1887 * supported for non-shared mounts. */
60e76d48 1888 return mount_verbose(LOG_ERR, NULL, q, NULL, MS_SLAVE, NULL);
785890ac
LP		 1889}
1890
317feb4d 1891static int setup_machine_id(const char *directory) {
691675ba
LP		 1892 const char *etc_machine_id;
1893 sd_id128_t id;
3bbaff3e 1894 int r;
e01ff70a 1895
317feb4d
LP		 1896 /* If the UUID in the container is already set, then that's what counts, and we use. If it isn't set, and the
1897 * caller passed --uuid=, then we'll pass it in the $container_uuid env var to PID 1 of the container. The
1898 * assumption is that PID 1 will then write it to /etc/machine-id to make it persistent. If --uuid= is not
1899 * passed we generate a random UUID, and pass it via $container_uuid. In effect this means that /etc/machine-id
1900 * in the container and our idea of the container UUID will always be in sync (at least if PID 1 in the
1901 * container behaves nicely). */
1902
e01ff70a
MS		 1903 etc_machine_id = prefix_roota(directory, "/etc/machine-id");
1904
691675ba 1905 r = id128_read(etc_machine_id, ID128_PLAIN, &id);
317feb4d
LP		 1906 if (r < 0) {
1907 if (!IN_SET(r, -ENOENT, -ENOMEDIUM)) /* If the file is missing or empty, we don't mind */
1908 return log_error_errno(r, "Failed to read machine ID from container image: %m");
691675ba 1909
317feb4d
LP		 1910 if (sd_id128_is_null(arg_uuid)) {
1911 r = sd_id128_randomize(&arg_uuid);
1912 if (r < 0)
1913 return log_error_errno(r, "Failed to acquire randomized machine UUID: %m");
1914 }
1915 } else {
1916 if (sd_id128_is_null(id)) {
1917 log_error("Machine ID in container image is zero, refusing.");
1918 return -EINVAL;
1919 }
e01ff70a 1920
317feb4d
LP		 1921 arg_uuid = id;
1922 }
691675ba 1923
e01ff70a
MS		 1924 return 0;
1925}
1926
7336138e
LP		 1927static int recursive_chown(const char *directory, uid_t shift, uid_t range) {
1928 int r;
1929
1930 assert(directory);
1931
0de7acce 1932 if (arg_userns_mode == USER_NAMESPACE_NO || !arg_userns_chown)
7336138e
LP		 1933 return 0;
1934
1935 r = path_patch_uid(directory, arg_uid_shift, arg_uid_range);
1936 if (r == -EOPNOTSUPP)
1937 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.");
1938 if (r == -EBADE)
1939 return log_error_errno(r, "Upper 16 bits of root directory UID and GID do not match.");
1940 if (r < 0)
1941 return log_error_errno(r, "Failed to adjust UID/GID shift of OS tree: %m");
1942 if (r == 0)
1943 log_debug("Root directory of image is already owned by the right UID/GID range, skipping recursive chown operation.");
1944 else
1945 log_debug("Patched directory tree to match UID/GID range.");
1946
1947 return r;
1948}
1949
113cea80 1950/*
6d416b9c
LS		 1951 * Return values:
1952 * < 0 : wait_for_terminate() failed to get the state of the
1953 * container, the container was terminated by a signal, or
1954 * failed for an unknown reason. No change is made to the
1955 * container argument.
1956 * > 0 : The program executed in the container terminated with an
1957 * error. The exit code of the program executed in the
919699ec
LP		 1958 * container is returned. The container argument has been set
1959 * to CONTAINER_TERMINATED.
6d416b9c
LS		 1960 * 0 : The container is being rebooted, has been shut down or exited
1961 * successfully. The container argument has been set to either
1962 * CONTAINER_TERMINATED or CONTAINER_REBOOTED.
113cea80 1963 *
6d416b9c
LS		 1964 * That is, success is indicated by a return value of zero, and an
1965 * error is indicated by a non-zero value.
113cea80
DH		 1966 */
1967static int wait_for_container(pid_t pid, ContainerStatus *container) {
113cea80 1968 siginfo_t status;
919699ec 1969 int r;
113cea80
DH		 1970
1971 r = wait_for_terminate(pid, &status);
f647962d
MS		 1972 if (r < 0)
1973 return log_warning_errno(r, "Failed to wait for container: %m");
113cea80
DH		 1974
1975 switch (status.si_code) {
fddbb89c 1976
113cea80 1977 case CLD_EXITED:
b5a2179b 1978 if (status.si_status == 0)
919699ec 1979 log_full(arg_quiet ? LOG_DEBUG : LOG_INFO, "Container %s exited successfully.", arg_machine);
b5a2179b 1980 else
919699ec 1981 log_full(arg_quiet ? LOG_DEBUG : LOG_INFO, "Container %s failed with error code %i.", arg_machine, status.si_status);
fddbb89c 1982
919699ec
LP		 1983 *container = CONTAINER_TERMINATED;
1984 return status.si_status;
113cea80
DH		 1985
1986 case CLD_KILLED:
1987 if (status.si_status == SIGINT) {
919699ec 1988 log_full(arg_quiet ? LOG_DEBUG : LOG_INFO, "Container %s has been shut down.", arg_machine);
113cea80 1989 *container = CONTAINER_TERMINATED;
919699ec
LP		 1990 return 0;
1991
113cea80 1992 } else if (status.si_status == SIGHUP) {
919699ec 1993 log_full(arg_quiet ? LOG_DEBUG : LOG_INFO, "Container %s is being rebooted.", arg_machine);
113cea80 1994 *container = CONTAINER_REBOOTED;
919699ec 1995 return 0;
113cea80 1996 }
919699ec 1997
ec251fe7 1998 /* fall through */
113cea80
DH		 1999
2000 case CLD_DUMPED:
fddbb89c 2001 log_error("Container %s terminated by signal %s.", arg_machine, signal_to_string(status.si_status));
919699ec 2002 return -EIO;
113cea80
DH		 2003
2004 default:
fddbb89c 2005 log_error("Container %s failed due to unknown reason.", arg_machine);
919699ec 2006 return -EIO;
113cea80 2007 }
113cea80
DH		 2008}
2009
023fb90b
LP		 2010static int on_orderly_shutdown(sd_event_source *s, const struct signalfd_siginfo *si, void *userdata) {
2011 pid_t pid;
2012
4a0b58c4 2013 pid = PTR_TO_PID(userdata);
023fb90b 2014 if (pid > 0) {
c6c8f6e2 2015 if (kill(pid, arg_kill_signal) >= 0) {
023fb90b
LP		 2016 log_info("Trying to halt container. Send SIGTERM again to trigger immediate termination.");
2017 sd_event_source_set_userdata(s, NULL);
2018 return 0;
2019 }
2020 }
2021
2022 sd_event_exit(sd_event_source_get_event(s), 0);
2023 return 0;
2024}
2025
6916b164
AU		 2026static int on_sigchld(sd_event_source *s, const struct signalfd_siginfo *ssi, void *userdata) {
2027 for (;;) {
2028 siginfo_t si = {};
2029 if (waitid(P_ALL, 0, &si, WNOHANG|WNOWAIT|WEXITED) < 0)
2030 return log_error_errno(errno, "Failed to waitid(): %m");
2031 if (si.si_pid == 0) /* No pending children. */
2032 break;
2033 if (si.si_pid == PTR_TO_PID(userdata)) {
2034 /* The main process we care for has exited. Return from
2035 * signal handler but leave the zombie. */
2036 sd_event_exit(sd_event_source_get_event(s), 0);
2037 break;
2038 }
2039 /* Reap all other children. */
2040 (void) waitid(P_PID, si.si_pid, &si, WNOHANG|WEXITED);
2041 }
2042
2043 return 0;
2044}
2045
ec16945e 2046static int determine_names(void) {
1b9cebf6 2047 int r;
ec16945e 2048
c1521918
LP		 2049 if (arg_template && !arg_directory && arg_machine) {
2050
2051 /* If --template= was specified then we should not
2052 * search for a machine, but instead create a new one
2053 * in /var/lib/machine. */
2054
605405c6 2055 arg_directory = strjoin("/var/lib/machines/", arg_machine);
c1521918
LP		 2056 if (!arg_directory)
2057 return log_oom();
2058 }
2059
ec16945e 2060 if (!arg_image && !arg_directory) {
1b9cebf6
LP		 2061 if (arg_machine) {
2062 _cleanup_(image_unrefp) Image *i = NULL;
2063
2064 r = image_find(arg_machine, &i);
2065 if (r < 0)
2066 return log_error_errno(r, "Failed to find image for machine '%s': %m", arg_machine);
0f3be6ca 2067 if (r == 0) {
35bca925 2068 log_error("No image for machine '%s'.", arg_machine);
1b9cebf6
LP		 2069 return -ENOENT;
2070 }
2071
aceac2f0 2072 if (i->type == IMAGE_RAW)
0f03c2a4 2073 r = free_and_strdup(&arg_image, i->path);
1b9cebf6 2074 else
0f03c2a4 2075 r = free_and_strdup(&arg_directory, i->path);
1b9cebf6 2076 if (r < 0)
0f3be6ca 2077 return log_oom();
1b9cebf6 2078
aee327b8
LP		 2079 if (!arg_ephemeral)
2080 arg_read_only = arg_read_only || i->read_only;
1b9cebf6 2081 } else
ec16945e
LP		 2082 arg_directory = get_current_dir_name();
2083
0f3be6ca 2084 if (!arg_directory && !arg_image) {
1b9cebf6 2085 log_error("Failed to determine path, please use -D or -i.");
ec16945e
LP		 2086 return -EINVAL;
2087 }
2088 }
2089
2090 if (!arg_machine) {
4827ab48 2091
b9ba4dab
LP		 2092 if (arg_directory && path_equal(arg_directory, "/"))
2093 arg_machine = gethostname_malloc();
4827ab48
LP		 2094 else {
2095 if (arg_image) {
2096 char *e;
2097
2098 arg_machine = strdup(basename(arg_image));
2099
2100 /* Truncate suffix if there is one */
2101 e = endswith(arg_machine, ".raw");
2102 if (e)
2103 *e = 0;
2104 } else
2105 arg_machine = strdup(basename(arg_directory));
2106 }
ec16945e
LP		 2107 if (!arg_machine)
2108 return log_oom();
2109
ae691c1d 2110 hostname_cleanup(arg_machine);
ec16945e
LP		 2111 if (!machine_name_is_valid(arg_machine)) {
2112 log_error("Failed to determine machine name automatically, please use -M.");
2113 return -EINVAL;
2114 }
b9ba4dab
LP		 2115
2116 if (arg_ephemeral) {
2117 char *b;
2118
2119 /* Add a random suffix when this is an
2120 * ephemeral machine, so that we can run many
2121 * instances at once without manually having
2122 * to specify -M each time. */
2123
2124 if (asprintf(&b, "%s-%016" PRIx64, arg_machine, random_u64()) < 0)
2125 return log_oom();
2126
2127 free(arg_machine);
2128 arg_machine = b;
2129 }
ec16945e
LP		 2130 }
2131
2132 return 0;
2133}
2134
8d4aa2bb 2135static int chase_symlinks_and_update(char **p, unsigned flags) {
3f342ec4
LP		 2136 char *chased;
2137 int r;
2138
2139 assert(p);
2140
2141 if (!*p)
2142 return 0;
2143
8d4aa2bb 2144 r = chase_symlinks(*p, NULL, flags, &chased);
3f342ec4
LP		 2145 if (r < 0)
2146 return log_error_errno(r, "Failed to resolve path %s: %m", *p);
2147
2148 free(*p);
2149 *p = chased;
2150
2151 return 0;
2152}
2153
03cfe0d5 2154static int determine_uid_shift(const char *directory) {
6dac160c
LP		 2155 int r;
2156
0de7acce 2157 if (arg_userns_mode == USER_NAMESPACE_NO) {
03cfe0d5 2158 arg_uid_shift = 0;
6dac160c 2159 return 0;
03cfe0d5 2160 }
6dac160c
LP		 2161
2162 if (arg_uid_shift == UID_INVALID) {
2163 struct stat st;
2164
03cfe0d5 2165 r = stat(directory, &st);
6dac160c 2166 if (r < 0)
03cfe0d5 2167 return log_error_errno(errno, "Failed to determine UID base of %s: %m", directory);
6dac160c
LP		 2168
2169 arg_uid_shift = st.st_uid & UINT32_C(0xffff0000);
2170
2171 if (arg_uid_shift != (st.st_gid & UINT32_C(0xffff0000))) {
03cfe0d5 2172 log_error("UID and GID base of %s don't match.", directory);
6dac160c
LP		 2173 return -EINVAL;
2174 }
2175
2176 arg_uid_range = UINT32_C(0x10000);
2177 }
2178
2179 if (arg_uid_shift > (uid_t) -1 - arg_uid_range) {
2180 log_error("UID base too high for UID range.");
2181 return -EINVAL;
2182 }
2183
6dac160c
LP		 2184 return 0;
2185}
2186
03cfe0d5
LP		 2187static int inner_child(
2188 Barrier *barrier,
2189 const char *directory,
2190 bool secondary,
2191 int kmsg_socket,
2192 int rtnl_socket,
f757855e 2193 FDSet *fds) {
69c79d3c 2194
03cfe0d5 2195 _cleanup_free_ char *home = NULL;
e01ff70a 2196 char as_uuid[37];
6aadfa4c 2197 unsigned n_env = 1;
03cfe0d5
LP		 2198 const char *envp[] = {
2199 "PATH=" DEFAULT_PATH_SPLIT_USR,
6aadfa4c 2200 NULL, /* container */
03cfe0d5
LP		 2201 NULL, /* TERM */
2202 NULL, /* HOME */
2203 NULL, /* USER */
2204 NULL, /* LOGNAME */
2205 NULL, /* container_uuid */
2206 NULL, /* LISTEN_FDS */
2207 NULL, /* LISTEN_PID */
9c1e04d0 2208 NULL, /* NOTIFY_SOCKET */
03cfe0d5
LP		 2209 NULL
2210 };
1a68e1e5 2211 const char *exec_target;
88213476 2212
2371271c 2213 _cleanup_strv_free_ char **env_use = NULL;
03cfe0d5 2214 int r;
88213476 2215
03cfe0d5
LP		 2216 assert(barrier);
2217 assert(directory);
2218 assert(kmsg_socket >= 0);
88213476 2219
0de7acce 2220 if (arg_userns_mode != USER_NAMESPACE_NO) {
03cfe0d5
LP		 2221 /* Tell the parent, that it now can write the UID map. */
2222 (void) barrier_place(barrier); /* #1 */
7027ff61 2223
03cfe0d5
LP		 2224 /* Wait until the parent wrote the UID map */
2225 if (!barrier_place_and_sync(barrier)) { /* #2 */
2226 log_error("Parent died too early");
2227 return -ESRCH;
2228 }
88213476
LP		 2229 }
2230
6d66bd3b
EV		 2231 r = reset_uid_gid();
2232 if (r < 0)
2233 return log_error_errno(r, "Couldn't become new root: %m");
2234
0de7acce 2235 r = mount_all(NULL,
4f086aab 2236 arg_mount_settings | MOUNT_IN_USERNS,
0de7acce
LP		 2237 arg_uid_shift,
2238 arg_uid_range,
2239 arg_selinux_apifs_context);
2240
03cfe0d5
LP		 2241 if (r < 0)
2242 return r;
2243
4f086aab 2244 r = mount_sysfs(NULL, arg_mount_settings);
d8fc6a00
LP		 2245 if (r < 0)
2246 return r;
2247
03cfe0d5
LP		 2248 /* Wait until we are cgroup-ified, so that we
2249 * can mount the right cgroup path writable */
2250 if (!barrier_place_and_sync(barrier)) { /* #3 */
2251 log_error("Parent died too early");
2252 return -ESRCH;
88213476
LP		 2253 }
2254
5a8ff0e6 2255 if (arg_use_cgns && cg_ns_supported()) {
0996ef00
CB		 2256 r = unshare(CLONE_NEWCGROUP);
2257 if (r < 0)
2258 return log_error_errno(errno, "Failed to unshare cgroup namespace");
2259 r = mount_cgroups(
2260 "",
2261 arg_unified_cgroup_hierarchy,
2262 arg_userns_mode != USER_NAMESPACE_NO,
2263 arg_uid_shift,
2264 arg_uid_range,
5a8ff0e6 2265 arg_selinux_apifs_context,
ada54120 2266 true);
0996ef00
CB		 2267 if (r < 0)
2268 return r;
2269 } else {
2270 r = mount_systemd_cgroup_writable("", arg_unified_cgroup_hierarchy);
2271 if (r < 0)
2272 return r;
2273 }
ec16945e 2274
03cfe0d5
LP		 2275 r = setup_boot_id(NULL);
2276 if (r < 0)
2277 return r;
ec16945e 2278
03cfe0d5
LP		 2279 r = setup_kmsg(NULL, kmsg_socket);
2280 if (r < 0)
2281 return r;
2282 kmsg_socket = safe_close(kmsg_socket);
ec16945e 2283
03cfe0d5 2284 umask(0022);
30535c16 2285
03cfe0d5
LP		 2286 if (setsid() < 0)
2287 return log_error_errno(errno, "setsid() failed: %m");
2288
2289 if (arg_private_network)
2290 loopback_setup();
2291
7a8f6325
LP		 2292 if (arg_expose_ports) {
2293 r = expose_port_send_rtnl(rtnl_socket);
2294 if (r < 0)
2295 return r;
2296 rtnl_socket = safe_close(rtnl_socket);
2297 }
03cfe0d5 2298
709f6e46
MS		 2299 r = drop_capabilities();
2300 if (r < 0)
2301 return log_error_errno(r, "drop_capabilities() failed: %m");
03cfe0d5
LP		 2302
2303 setup_hostname();
2304
050f7277 2305 if (arg_personality != PERSONALITY_INVALID) {
21022b9d
LP		 2306 r = safe_personality(arg_personality);
2307 if (r < 0)
2308 return log_error_errno(r, "personality() failed: %m");
03cfe0d5 2309 } else if (secondary) {
21022b9d
LP		 2310 r = safe_personality(PER_LINUX32);
2311 if (r < 0)
2312 return log_error_errno(r, "personality() failed: %m");
03cfe0d5
LP		 2313 }
2314
2315#ifdef HAVE_SELINUX
2316 if (arg_selinux_context)
2ed96880 2317 if (setexeccon(arg_selinux_context) < 0)
03cfe0d5
LP		 2318 return log_error_errno(errno, "setexeccon(\"%s\") failed: %m", arg_selinux_context);
2319#endif
2320
ee645080 2321 r = change_uid_gid(arg_user, &home);
03cfe0d5
LP		 2322 if (r < 0)
2323 return r;
2324
6aadfa4c
ILG		 2325 /* LXC sets container=lxc, so follow the scheme here */
2326 envp[n_env++] = strjoina("container=", arg_container_service_name);
2327
03cfe0d5
LP		 2328 envp[n_env] = strv_find_prefix(environ, "TERM=");
2329 if (envp[n_env])
313cefa1 2330 n_env++;
03cfe0d5
LP		 2331
2332 if ((asprintf((char**)(envp + n_env++), "HOME=%s", home ? home: "/root") < 0) ||
2333 (asprintf((char**)(envp + n_env++), "USER=%s", arg_user ? arg_user : "root") < 0) ||
2334 (asprintf((char**)(envp + n_env++), "LOGNAME=%s", arg_user ? arg_user : "root") < 0))
2335 return log_oom();
2336
3bbaff3e 2337 assert(!sd_id128_is_null(arg_uuid));
03cfe0d5 2338
691675ba 2339 if (asprintf((char**)(envp + n_env++), "container_uuid=%s", id128_to_uuid_string(arg_uuid, as_uuid)) < 0)
e01ff70a 2340 return log_oom();
03cfe0d5
LP		 2341
2342 if (fdset_size(fds) > 0) {
2343 r = fdset_cloexec(fds, false);
2344 if (r < 0)
2345 return log_error_errno(r, "Failed to unset O_CLOEXEC for file descriptors.");
2346
2347 if ((asprintf((char **)(envp + n_env++), "LISTEN_FDS=%u", fdset_size(fds)) < 0) ||
2348 (asprintf((char **)(envp + n_env++), "LISTEN_PID=1") < 0))
2349 return log_oom();
2350 }
9c1e04d0
AP		 2351 if (asprintf((char **)(envp + n_env++), "NOTIFY_SOCKET=%s", NSPAWN_NOTIFY_SOCKET_PATH) < 0)
2352 return log_oom();
03cfe0d5 2353
2371271c
TG		 2354 env_use = strv_env_merge(2, envp, arg_setenv);
2355 if (!env_use)
2356 return log_oom();
03cfe0d5
LP		 2357
2358 /* Let the parent know that we are ready and
2359 * wait until the parent is ready with the
2360 * setup, too... */
2361 if (!barrier_place_and_sync(barrier)) { /* #4 */
2362 log_error("Parent died too early");
2363 return -ESRCH;
2364 }
2365
5f932eb9
LP		 2366 if (arg_chdir)
2367 if (chdir(arg_chdir) < 0)
2368 return log_error_errno(errno, "Failed to change to specified working directory %s: %m", arg_chdir);
2369
7732f92b 2370 if (arg_start_mode == START_PID2) {
75bf701f 2371 r = stub_pid1(arg_uuid);
7732f92b
LP		 2372 if (r < 0)
2373 return r;
2374 }
2375
03cfe0d5
LP		 2376 /* Now, explicitly close the log, so that we
2377 * then can close all remaining fds. Closing
2378 * the log explicitly first has the benefit
2379 * that the logging subsystem knows about it,
2380 * and is thus ready to be reopened should we
2381 * need it again. Note that the other fds
2382 * closed here are at least the locking and
2383 * barrier fds. */
2384 log_close();
2385 (void) fdset_close_others(fds);
2386
7732f92b 2387 if (arg_start_mode == START_BOOT) {
03cfe0d5
LP		 2388 char **a;
2389 size_t m;
2390
2391 /* Automatically search for the init system */
2392
75f32f04
ZJS		 2393 m = strv_length(arg_parameters);
2394 a = newa(char*, m + 2);
2395 memcpy_safe(a + 1, arg_parameters, m * sizeof(char*));
2396 a[1 + m] = NULL;
03cfe0d5 2397
ced58da7 2398 a[0] = (char*) "/usr/lib/systemd/systemd";
03cfe0d5
LP		 2399 execve(a[0], a, env_use);
2400
ced58da7 2401 a[0] = (char*) "/lib/systemd/systemd";
03cfe0d5
LP		 2402 execve(a[0], a, env_use);
2403
ced58da7 2404 a[0] = (char*) "/sbin/init";
03cfe0d5 2405 execve(a[0], a, env_use);
ced58da7
LP		 2406
2407 exec_target = "/usr/lib/systemd/systemd, /lib/systemd/systemd, /sbin/init";
1a68e1e5
PW		 2408 } else if (!strv_isempty(arg_parameters)) {
2409 exec_target = arg_parameters[0];
f757855e 2410 execvpe(arg_parameters[0], arg_parameters, env_use);
1a68e1e5 2411 } else {
5f932eb9 2412 if (!arg_chdir)
d929b0f9
ZJS		 2413 /* If we cannot change the directory, we'll end up in /, that is expected. */
2414 (void) chdir(home ?: "/root");
5f932eb9 2415
03cfe0d5
LP		 2416 execle("/bin/bash", "-bash", NULL, env_use);
2417 execle("/bin/sh", "-sh", NULL, env_use);
ced58da7
LP		 2418
2419 exec_target = "/bin/bash, /bin/sh";
03cfe0d5
LP		 2420 }
2421
35607a8d 2422 r = -errno;
03cfe0d5 2423 (void) log_open();
1a68e1e5 2424 return log_error_errno(r, "execv(%s) failed: %m", exec_target);
03cfe0d5
LP		 2425}
2426
9c1e04d0
AP		 2427static int setup_sd_notify_child(void) {
2428 static const int one = 1;
2429 int fd = -1;
2430 union sockaddr_union sa = {
2431 .sa.sa_family = AF_UNIX,
2432 };
2433 int r;
2434
2435 fd = socket(AF_UNIX, SOCK_DGRAM|SOCK_CLOEXEC|SOCK_NONBLOCK, 0);
2436 if (fd < 0)
2437 return log_error_errno(errno, "Failed to allocate notification socket: %m");
2438
2439 (void) mkdir_parents(NSPAWN_NOTIFY_SOCKET_PATH, 0755);
2440 (void) unlink(NSPAWN_NOTIFY_SOCKET_PATH);
2441
2442 strncpy(sa.un.sun_path, NSPAWN_NOTIFY_SOCKET_PATH, sizeof(sa.un.sun_path)-1);
2443 r = bind(fd, &sa.sa, SOCKADDR_UN_LEN(sa.un));
2444 if (r < 0) {
2445 safe_close(fd);
2446 return log_error_errno(errno, "bind(%s) failed: %m", sa.un.sun_path);
2447 }
2448
adc7d9f0
EV		 2449 r = userns_lchown(NSPAWN_NOTIFY_SOCKET_PATH, 0, 0);
2450 if (r < 0) {
2451 safe_close(fd);
2452 return log_error_errno(r, "Failed to chown " NSPAWN_NOTIFY_SOCKET_PATH ": %m");
2453 }
2454
9c1e04d0
AP		 2455 r = setsockopt(fd, SOL_SOCKET, SO_PASSCRED, &one, sizeof(one));
2456 if (r < 0) {
2457 safe_close(fd);
2458 return log_error_errno(errno, "SO_PASSCRED failed: %m");
2459 }
2460
2461 return fd;
2462}
2463
03cfe0d5
LP		 2464static int outer_child(
2465 Barrier *barrier,
2466 const char *directory,
2467 const char *console,
2d845785 2468 DissectedImage *dissected_image,
03cfe0d5
LP		 2469 bool interactive,
2470 bool secondary,
2471 int pid_socket,
e01ff70a 2472 int uuid_socket,
9c1e04d0 2473 int notify_socket,
03cfe0d5
LP		 2474 int kmsg_socket,
2475 int rtnl_socket,
825d5287 2476 int uid_shift_socket,
f757855e 2477 FDSet *fds) {
03cfe0d5
LP		 2478
2479 pid_t pid;
2480 ssize_t l;
2481 int r;
9c1e04d0 2482 _cleanup_close_ int fd = -1;
03cfe0d5
LP		 2483
2484 assert(barrier);
2485 assert(directory);
2486 assert(console);
2487 assert(pid_socket >= 0);
e01ff70a 2488 assert(uuid_socket >= 0);
9c1e04d0 2489 assert(notify_socket >= 0);
03cfe0d5
LP		 2490 assert(kmsg_socket >= 0);
2491
2492 if (prctl(PR_SET_PDEATHSIG, SIGKILL) < 0)
2493 return log_error_errno(errno, "PR_SET_PDEATHSIG failed: %m");
2494
2495 if (interactive) {
2496 close_nointr(STDIN_FILENO);
2497 close_nointr(STDOUT_FILENO);
2498 close_nointr(STDERR_FILENO);
2499
2500 r = open_terminal(console, O_RDWR);
2501 if (r != STDIN_FILENO) {
2502 if (r >= 0) {
2503 safe_close(r);
2504 r = -EINVAL;
2505 }
2506
2507 return log_error_errno(r, "Failed to open console: %m");
2508 }
2509
2510 if (dup2(STDIN_FILENO, STDOUT_FILENO) != STDOUT_FILENO ||
2511 dup2(STDIN_FILENO, STDERR_FILENO) != STDERR_FILENO)
2512 return log_error_errno(errno, "Failed to duplicate console: %m");
2513 }
2514
2515 r = reset_audit_loginuid();
2516 if (r < 0)
2517 return r;
2518
2519 /* Mark everything as slave, so that we still
2520 * receive mounts from the real root, but don't
2521 * propagate mounts to the real root. */
60e76d48
ZJS		 2522 r = mount_verbose(LOG_ERR, NULL, "/", NULL, MS_SLAVE|MS_REC, NULL);
2523 if (r < 0)
2524 return r;
03cfe0d5 2525
2d845785 2526 if (dissected_image) {
18b5886e 2527 r = dissected_image_mount(dissected_image, directory, DISSECT_IMAGE_DISCARD_ON_LOOP|(arg_read_only ? DISSECT_IMAGE_READ_ONLY : 0));
2d845785
LP		 2528 if (r < 0)
2529 return r;
2530 }
03cfe0d5 2531
391567f4
LP		 2532 r = determine_uid_shift(directory);
2533 if (r < 0)
2534 return r;
2535
0de7acce 2536 if (arg_userns_mode != USER_NAMESPACE_NO) {
0e7ac751 2537 /* Let the parent know which UID shift we read from the image */
825d5287
RM		 2538 l = send(uid_shift_socket, &arg_uid_shift, sizeof(arg_uid_shift), MSG_NOSIGNAL);
2539 if (l < 0)
2540 return log_error_errno(errno, "Failed to send UID shift: %m");
2541 if (l != sizeof(arg_uid_shift)) {
2542 log_error("Short write while sending UID shift.");
2543 return -EIO;
2544 }
0e7ac751 2545
0de7acce 2546 if (arg_userns_mode == USER_NAMESPACE_PICK) {
0e7ac751
LP		 2547 /* When we are supposed to pick the UID shift, the parent will check now whether the UID shift
2548 * we just read from the image is available. If yes, it will send the UID shift back to us, if
2549 * not it will pick a different one, and send it back to us. */
2550
2551 l = recv(uid_shift_socket, &arg_uid_shift, sizeof(arg_uid_shift), 0);
2552 if (l < 0)
2553 return log_error_errno(errno, "Failed to recv UID shift: %m");
2554 if (l != sizeof(arg_uid_shift)) {
595bfe7d 2555 log_error("Short read while receiving UID shift.");
0e7ac751
LP		 2556 return -EIO;
2557 }
2558 }
2559
2560 log_info("Selected user namespace base " UID_FMT " and range " UID_FMT ".", arg_uid_shift, arg_uid_range);
825d5287
RM		 2561 }
2562
03cfe0d5 2563 /* Turn directory into bind mount */
60e76d48
ZJS		 2564 r = mount_verbose(LOG_ERR, directory, directory, NULL, MS_BIND|MS_REC, NULL);
2565 if (r < 0)
2566 return r;
03cfe0d5 2567
b53ede69
PW		 2568 r = setup_pivot_root(
2569 directory,
2570 arg_pivot_root_new,
2571 arg_pivot_root_old);
2572 if (r < 0)
2573 return r;
2574
0de7acce
LP		 2575 r = setup_volatile(
2576 directory,
2577 arg_volatile_mode,
2578 arg_userns_mode != USER_NAMESPACE_NO,
2579 arg_uid_shift,
2580 arg_uid_range,
2581 arg_selinux_context);
03cfe0d5
LP		 2582 if (r < 0)
2583 return r;
2584
0de7acce
LP		 2585 r = setup_volatile_state(
2586 directory,
2587 arg_volatile_mode,
2588 arg_userns_mode != USER_NAMESPACE_NO,
2589 arg_uid_shift,
2590 arg_uid_range,
2591 arg_selinux_context);
03cfe0d5
LP		 2592 if (r < 0)
2593 return r;
2594
4ad14eff
LP		 2595 /* Mark everything as shared so our mounts get propagated down. This is
2596 * required to make new bind mounts available in systemd services
2597 * inside the containter that create a new mount namespace.
2598 * See https://github.com/systemd/systemd/issues/3860
2599 * Further submounts (such as /dev) done after this will inherit the
13e785f7 2600 * shared propagation mode. */
4ad14eff
LP		 2601 r = mount_verbose(LOG_ERR, NULL, directory, NULL, MS_SHARED|MS_REC, NULL);
2602 if (r < 0)
2603 return r;
2604
2605 r = recursive_chown(directory, arg_uid_shift, arg_uid_range);
2606 if (r < 0)
2607 return r;
2608
03cfe0d5
LP		 2609 r = base_filesystem_create(directory, arg_uid_shift, (gid_t) arg_uid_shift);
2610 if (r < 0)
2611 return r;
2612
03cfe0d5 2613 if (arg_read_only) {
6b7c9f8b 2614 r = bind_remount_recursive(directory, true, NULL);
03cfe0d5
LP		 2615 if (r < 0)
2616 return log_error_errno(r, "Failed to make tree read-only: %m");
2617 }
2618
0de7acce 2619 r = mount_all(directory,
4f086aab 2620 arg_mount_settings,
0de7acce
LP		 2621 arg_uid_shift,
2622 arg_uid_range,
2623 arg_selinux_apifs_context);
03cfe0d5
LP		 2624 if (r < 0)
2625 return r;
2626
07fa00f9
LP		 2627 r = copy_devnodes(directory);
2628 if (r < 0)
03cfe0d5
LP		 2629 return r;
2630
2631 dev_setup(directory, arg_uid_shift, arg_uid_shift);
2632
07fa00f9
LP		 2633 r = setup_pts(directory);
2634 if (r < 0)
03cfe0d5
LP		 2635 return r;
2636
2637 r = setup_propagate(directory);
2638 if (r < 0)
2639 return r;
2640
2641 r = setup_dev_console(directory, console);
2642 if (r < 0)
2643 return r;
2644
960e4569 2645 r = setup_seccomp(arg_caps_retain, arg_syscall_whitelist, arg_syscall_blacklist);
03cfe0d5
LP		 2646 if (r < 0)
2647 return r;
2648
2649 r = setup_timezone(directory);
2650 if (r < 0)
2651 return r;
2652
2653 r = setup_resolv_conf(directory);
2654 if (r < 0)
2655 return r;
2656
e01ff70a
MS		 2657 r = setup_machine_id(directory);
2658 if (r < 0)
2659 return r;
2660
03cfe0d5
LP		 2661 r = setup_journal(directory);
2662 if (r < 0)
2663 return r;
2664
0de7acce
LP		 2665 r = mount_custom(
2666 directory,
2667 arg_custom_mounts,
2668 arg_n_custom_mounts,
2669 arg_userns_mode != USER_NAMESPACE_NO,
2670 arg_uid_shift,
2671 arg_uid_range,
2672 arg_selinux_apifs_context);
03cfe0d5
LP		 2673 if (r < 0)
2674 return r;
2675
5a8ff0e6 2676 if (!arg_use_cgns || !cg_ns_supported()) {
0996ef00
CB		 2677 r = mount_cgroups(
2678 directory,
2679 arg_unified_cgroup_hierarchy,
2680 arg_userns_mode != USER_NAMESPACE_NO,
2681 arg_uid_shift,
2682 arg_uid_range,
5a8ff0e6 2683 arg_selinux_apifs_context,
ada54120 2684 false);
0996ef00
CB		 2685 if (r < 0)
2686 return r;
2687 }
03cfe0d5
LP		 2688
2689 r = mount_move_root(directory);
2690 if (r < 0)
2691 return log_error_errno(r, "Failed to move root directory: %m");
2692
9c1e04d0
AP		 2693 fd = setup_sd_notify_child();
2694 if (fd < 0)
2695 return fd;
2696
03cfe0d5 2697 pid = raw_clone(SIGCHLD|CLONE_NEWNS|
0c582db0 2698 arg_clone_ns_flags |
03cfe0d5 2699 (arg_private_network ? CLONE_NEWNET : 0) |
8869a0b4 2700 (arg_userns_mode != USER_NAMESPACE_NO ? CLONE_NEWUSER : 0));
03cfe0d5
LP		 2701 if (pid < 0)
2702 return log_error_errno(errno, "Failed to fork inner child: %m");
03cfe0d5
LP		 2703 if (pid == 0) {
2704 pid_socket = safe_close(pid_socket);
e01ff70a 2705 uuid_socket = safe_close(uuid_socket);
9c1e04d0 2706 notify_socket = safe_close(notify_socket);
825d5287 2707 uid_shift_socket = safe_close(uid_shift_socket);
03cfe0d5
LP		 2708
2709 /* The inner child has all namespaces that are
2710 * requested, so that we all are owned by the user if
2711 * user namespaces are turned on. */
2712
f757855e 2713 r = inner_child(barrier, directory, secondary, kmsg_socket, rtnl_socket, fds);
03cfe0d5
LP		 2714 if (r < 0)
2715 _exit(EXIT_FAILURE);
2716
2717 _exit(EXIT_SUCCESS);
2718 }
2719
2720 l = send(pid_socket, &pid, sizeof(pid), MSG_NOSIGNAL);
2721 if (l < 0)
2722 return log_error_errno(errno, "Failed to send PID: %m");
2723 if (l != sizeof(pid)) {
2724 log_error("Short write while sending PID.");
2725 return -EIO;
2726 }
2727
e01ff70a
MS		 2728 l = send(uuid_socket, &arg_uuid, sizeof(arg_uuid), MSG_NOSIGNAL);
2729 if (l < 0)
2730 return log_error_errno(errno, "Failed to send machine ID: %m");
2731 if (l != sizeof(arg_uuid)) {
2732 log_error("Short write while sending machine ID.");
2733 return -EIO;
2734 }
2735
9c1e04d0
AP		 2736 l = send_one_fd(notify_socket, fd, 0);
2737 if (l < 0)
2738 return log_error_errno(errno, "Failed to send notify fd: %m");
2739
03cfe0d5 2740 pid_socket = safe_close(pid_socket);
e01ff70a 2741 uuid_socket = safe_close(uuid_socket);
9c1e04d0 2742 notify_socket = safe_close(notify_socket);
327e26d6
KN		 2743 kmsg_socket = safe_close(kmsg_socket);
2744 rtnl_socket = safe_close(rtnl_socket);
03cfe0d5
LP		 2745
2746 return 0;
2747}
2748
0e7ac751
LP		 2749static int uid_shift_pick(uid_t *shift, LockFile *ret_lock_file) {
2750 unsigned n_tries = 100;
2751 uid_t candidate;
2752 int r;
2753
2754 assert(shift);
2755 assert(ret_lock_file);
0de7acce 2756 assert(arg_userns_mode == USER_NAMESPACE_PICK);
0e7ac751
LP		 2757 assert(arg_uid_range == 0x10000U);
2758
2759 candidate = *shift;
2760
2761 (void) mkdir("/run/systemd/nspawn-uid", 0755);
2762
2763 for (;;) {
2764 char lock_path[strlen("/run/systemd/nspawn-uid/") + DECIMAL_STR_MAX(uid_t) + 1];
2765 _cleanup_release_lock_file_ LockFile lf = LOCK_FILE_INIT;
2766
2767 if (--n_tries <= 0)
2768 return -EBUSY;
2769
2770 if (candidate < UID_SHIFT_PICK_MIN || candidate > UID_SHIFT_PICK_MAX)
2771 goto next;
2772 if ((candidate & UINT32_C(0xFFFF)) != 0)
2773 goto next;
2774
2775 xsprintf(lock_path, "/run/systemd/nspawn-uid/" UID_FMT, candidate);
2776 r = make_lock_file(lock_path, LOCK_EX|LOCK_NB, &lf);
2777 if (r == -EBUSY) /* Range already taken by another nspawn instance */
2778 goto next;
2779 if (r < 0)
2780 return r;
2781
2782 /* Make some superficial checks whether the range is currently known in the user database */
2783 if (getpwuid(candidate))
2784 goto next;
2785 if (getpwuid(candidate + UINT32_C(0xFFFE)))
2786 goto next;
2787 if (getgrgid(candidate))
2788 goto next;
2789 if (getgrgid(candidate + UINT32_C(0xFFFE)))
2790 goto next;
2791
2792 *ret_lock_file = lf;
2793 lf = (struct LockFile) LOCK_FILE_INIT;
2794 *shift = candidate;
2795 return 0;
2796
2797 next:
2798 random_bytes(&candidate, sizeof(candidate));
2799 candidate = (candidate % (UID_SHIFT_PICK_MAX - UID_SHIFT_PICK_MIN)) + UID_SHIFT_PICK_MIN;
2800 candidate &= (uid_t) UINT32_C(0xFFFF0000);
2801 }
2802}
2803
03cfe0d5
LP		 2804static int setup_uid_map(pid_t pid) {
2805 char uid_map[strlen("/proc//uid_map") + DECIMAL_STR_MAX(uid_t) + 1], line[DECIMAL_STR_MAX(uid_t)*3+3+1];
2806 int r;
2807
2808 assert(pid > 1);
2809
2810 xsprintf(uid_map, "/proc/" PID_FMT "/uid_map", pid);
2811 xsprintf(line, UID_FMT " " UID_FMT " " UID_FMT "\n", 0, arg_uid_shift, arg_uid_range);
ad118bda 2812 r = write_string_file(uid_map, line, 0);
03cfe0d5
LP		 2813 if (r < 0)
2814 return log_error_errno(r, "Failed to write UID map: %m");
2815
2816 /* We always assign the same UID and GID ranges */
2817 xsprintf(uid_map, "/proc/" PID_FMT "/gid_map", pid);
ad118bda 2818 r = write_string_file(uid_map, line, 0);
03cfe0d5
LP		 2819 if (r < 0)
2820 return log_error_errno(r, "Failed to write GID map: %m");
2821
2822 return 0;
2823}
2824
9c1e04d0 2825static int nspawn_dispatch_notify_fd(sd_event_source *source, int fd, uint32_t revents, void *userdata) {
9c1e04d0
AP		 2826 char buf[NOTIFY_BUFFER_MAX+1];
2827 char *p = NULL;
2828 struct iovec iovec = {
2829 .iov_base = buf,
2830 .iov_len = sizeof(buf)-1,
2831 };
2832 union {
2833 struct cmsghdr cmsghdr;
2834 uint8_t buf[CMSG_SPACE(sizeof(struct ucred)) +
2835 CMSG_SPACE(sizeof(int) * NOTIFY_FD_MAX)];
2836 } control = {};
2837 struct msghdr msghdr = {
2838 .msg_iov = &iovec,
2839 .msg_iovlen = 1,
2840 .msg_control = &control,
2841 .msg_controllen = sizeof(control),
2842 };
2843 struct cmsghdr *cmsg;
2844 struct ucred *ucred = NULL;
2845 ssize_t n;
2846 pid_t inner_child_pid;
2847 _cleanup_strv_free_ char **tags = NULL;
2848
2849 assert(userdata);
2850
2851 inner_child_pid = PTR_TO_PID(userdata);
2852
2853 if (revents != EPOLLIN) {
2854 log_warning("Got unexpected poll event for notify fd.");
2855 return 0;
2856 }
2857
2858 n = recvmsg(fd, &msghdr, MSG_DONTWAIT|MSG_CMSG_CLOEXEC);
2859 if (n < 0) {
2860 if (errno == EAGAIN || errno == EINTR)
2861 return 0;
2862
2863 return log_warning_errno(errno, "Couldn't read notification socket: %m");
2864 }
2865 cmsg_close_all(&msghdr);
2866
2867 CMSG_FOREACH(cmsg, &msghdr) {
2868 if (cmsg->cmsg_level == SOL_SOCKET &&
2869 cmsg->cmsg_type == SCM_CREDENTIALS &&
2870 cmsg->cmsg_len == CMSG_LEN(sizeof(struct ucred))) {
2871
2872 ucred = (struct ucred*) CMSG_DATA(cmsg);
2873 }
2874 }
2875
2876 if (!ucred || ucred->pid != inner_child_pid) {
8cb57430 2877 log_debug("Received notify message without valid credentials. Ignoring.");
9c1e04d0
AP		 2878 return 0;
2879 }
2880
2881 if ((size_t) n >= sizeof(buf)) {
2882 log_warning("Received notify message exceeded maximum size. Ignoring.");
2883 return 0;
2884 }
2885
2886 buf[n] = 0;
2887 tags = strv_split(buf, "\n\r");
2888 if (!tags)
2889 return log_oom();
2890
2891 if (strv_find(tags, "READY=1"))
2892 sd_notifyf(false, "READY=1\n");
2893
2894 p = strv_find_startswith(tags, "STATUS=");
2895 if (p)
2896 sd_notifyf(false, "STATUS=Container running: %s", p);
2897
2898 return 0;
2899}
2900
5773024d 2901static int setup_sd_notify_parent(sd_event *event, int fd, pid_t *inner_child_pid, sd_event_source **notify_event_source) {
9c1e04d0 2902 int r;
9c1e04d0 2903
5773024d 2904 r = sd_event_add_io(event, notify_event_source, fd, EPOLLIN, nspawn_dispatch_notify_fd, inner_child_pid);
9c1e04d0
AP		 2905 if (r < 0)
2906 return log_error_errno(r, "Failed to allocate notify event source: %m");
2907
5773024d 2908 (void) sd_event_source_set_description(*notify_event_source, "nspawn-notify");
9c1e04d0
AP		 2909
2910 return 0;
2911}
2912
f757855e
LP		 2913static int load_settings(void) {
2914 _cleanup_(settings_freep) Settings *settings = NULL;
2915 _cleanup_fclose_ FILE *f = NULL;
2916 _cleanup_free_ char *p = NULL;
2917 const char *fn, *i;
2918 int r;
2919
2920 /* If all settings are masked, there's no point in looking for
2921 * the settings file */
2922 if ((arg_settings_mask & _SETTINGS_MASK_ALL) == _SETTINGS_MASK_ALL)
2923 return 0;
2924
2925 fn = strjoina(arg_machine, ".nspawn");
2926
2927 /* We first look in the admin's directories in /etc and /run */
2928 FOREACH_STRING(i, "/etc/systemd/nspawn", "/run/systemd/nspawn") {
2929 _cleanup_free_ char *j = NULL;
2930
605405c6 2931 j = strjoin(i, "/", fn);
f757855e
LP		 2932 if (!j)
2933 return log_oom();
2934
2935 f = fopen(j, "re");
2936 if (f) {
2937 p = j;
2938 j = NULL;
2939
b938cb90 2940 /* By default, we trust configuration from /etc and /run */
f757855e
LP		 2941 if (arg_settings_trusted < 0)
2942 arg_settings_trusted = true;
2943
2944 break;
2945 }
2946
2947 if (errno != ENOENT)
2948 return log_error_errno(errno, "Failed to open %s: %m", j);
2949 }
2950
2951 if (!f) {
2952 /* After that, let's look for a file next to the
2953 * actual image we shall boot. */
2954
2955 if (arg_image) {
2956 p = file_in_same_dir(arg_image, fn);
2957 if (!p)
2958 return log_oom();
2959 } else if (arg_directory) {
2960 p = file_in_same_dir(arg_directory, fn);
2961 if (!p)
2962 return log_oom();
2963 }
2964
2965 if (p) {
2966 f = fopen(p, "re");
2967 if (!f && errno != ENOENT)
2968 return log_error_errno(errno, "Failed to open %s: %m", p);
2969
b938cb90 2970 /* By default, we do not trust configuration from /var/lib/machines */
f757855e
LP		 2971 if (arg_settings_trusted < 0)
2972 arg_settings_trusted = false;
2973 }
2974 }
2975
2976 if (!f)
2977 return 0;
2978
2979 log_debug("Settings are trusted: %s", yes_no(arg_settings_trusted));
2980
2981 r = settings_load(f, p, &settings);
2982 if (r < 0)
2983 return r;
2984
2985 /* Copy over bits from the settings, unless they have been
2986 * explicitly masked by command line switches. */
2987
7732f92b
LP		 2988 if ((arg_settings_mask & SETTING_START_MODE) == 0 &&
2989 settings->start_mode >= 0) {
2990 arg_start_mode = settings->start_mode;
f757855e
LP		 2991
2992 strv_free(arg_parameters);
2993 arg_parameters = settings->parameters;
2994 settings->parameters = NULL;
2995 }
2996
b53ede69
PW		 2997 if ((arg_settings_mask & SETTING_PIVOT_ROOT) == 0 &&
2998 settings->pivot_root_new) {
2999 free_and_replace(arg_pivot_root_new, settings->pivot_root_new);
3000 free_and_replace(arg_pivot_root_old, settings->pivot_root_old);
3001 }
3002
5f932eb9
LP		 3003 if ((arg_settings_mask & SETTING_WORKING_DIRECTORY) == 0 &&
3004 settings->working_directory) {
3005 free(arg_chdir);
3006 arg_chdir = settings->working_directory;
3007 settings->working_directory = NULL;
3008 }
3009
f757855e
LP		 3010 if ((arg_settings_mask & SETTING_ENVIRONMENT) == 0 &&
3011 settings->environment) {
3012 strv_free(arg_setenv);
3013 arg_setenv = settings->environment;
3014 settings->environment = NULL;
3015 }
3016
3017 if ((arg_settings_mask & SETTING_USER) == 0 &&
3018 settings->user) {
3019 free(arg_user);
3020 arg_user = settings->user;
3021 settings->user = NULL;
3022 }
3023
3024 if ((arg_settings_mask & SETTING_CAPABILITY) == 0) {
0e265674 3025 uint64_t plus;
f757855e 3026
0e265674
LP		 3027 plus = settings->capability;
3028 if (settings_private_network(settings))
3029 plus |= (1ULL << CAP_NET_ADMIN);
3030
3031 if (!arg_settings_trusted && plus != 0) {
3032 if (settings->capability != 0)
3033 log_warning("Ignoring Capability= setting, file %s is not trusted.", p);
3034 } else
520e0d54 3035 arg_caps_retain |= plus;
f757855e 3036
520e0d54 3037 arg_caps_retain &= ~settings->drop_capability;
f757855e
LP		 3038 }
3039
3040 if ((arg_settings_mask & SETTING_KILL_SIGNAL) == 0 &&
3041 settings->kill_signal > 0)
3042 arg_kill_signal = settings->kill_signal;
3043
3044 if ((arg_settings_mask & SETTING_PERSONALITY) == 0 &&
3045 settings->personality != PERSONALITY_INVALID)
3046 arg_personality = settings->personality;
3047
3048 if ((arg_settings_mask & SETTING_MACHINE_ID) == 0 &&
3049 !sd_id128_is_null(settings->machine_id)) {
3050
3051 if (!arg_settings_trusted)
3052 log_warning("Ignoring MachineID= setting, file %s is not trusted.", p);
3053 else
3054 arg_uuid = settings->machine_id;
3055 }
3056
3057 if ((arg_settings_mask & SETTING_READ_ONLY) == 0 &&
3058 settings->read_only >= 0)
3059 arg_read_only = settings->read_only;
3060
3061 if ((arg_settings_mask & SETTING_VOLATILE_MODE) == 0 &&
3062 settings->volatile_mode != _VOLATILE_MODE_INVALID)
3063 arg_volatile_mode = settings->volatile_mode;
3064
3065 if ((arg_settings_mask & SETTING_CUSTOM_MOUNTS) == 0 &&
3066 settings->n_custom_mounts > 0) {
3067
3068 if (!arg_settings_trusted)
3069 log_warning("Ignoring TemporaryFileSystem=, Bind= and BindReadOnly= settings, file %s is not trusted.", p);
3070 else {
3071 custom_mount_free_all(arg_custom_mounts, arg_n_custom_mounts);
3072 arg_custom_mounts = settings->custom_mounts;
3073 arg_n_custom_mounts = settings->n_custom_mounts;
3074
3075 settings->custom_mounts = NULL;
3076 settings->n_custom_mounts = 0;
3077 }
3078 }
3079
3080 if ((arg_settings_mask & SETTING_NETWORK) == 0 &&
3081 (settings->private_network >= 0 ||
3082 settings->network_veth >= 0 ||
3083 settings->network_bridge ||
22b28dfd 3084 settings->network_zone ||
f757855e
LP		 3085 settings->network_interfaces ||
3086 settings->network_macvlan ||
f6d6bad1
LP		 3087 settings->network_ipvlan ||
3088 settings->network_veth_extra)) {
f757855e
LP		 3089
3090 if (!arg_settings_trusted)
3091 log_warning("Ignoring network settings, file %s is not trusted.", p);
3092 else {
f6d6bad1 3093 arg_network_veth = settings_network_veth(settings);
0e265674
LP		 3094 arg_private_network = settings_private_network(settings);
3095
f757855e
LP		 3096 strv_free(arg_network_interfaces);
3097 arg_network_interfaces = settings->network_interfaces;
3098 settings->network_interfaces = NULL;
3099
3100 strv_free(arg_network_macvlan);
3101 arg_network_macvlan = settings->network_macvlan;
3102 settings->network_macvlan = NULL;
3103
3104 strv_free(arg_network_ipvlan);
3105 arg_network_ipvlan = settings->network_ipvlan;
3106 settings->network_ipvlan = NULL;
3107
f6d6bad1
LP		 3108 strv_free(arg_network_veth_extra);
3109 arg_network_veth_extra = settings->network_veth_extra;
3110 settings->network_veth_extra = NULL;
3111
f757855e
LP		 3112 free(arg_network_bridge);
3113 arg_network_bridge = settings->network_bridge;
3114 settings->network_bridge = NULL;
22b28dfd
LP		 3115
3116 free(arg_network_zone);
3117 arg_network_zone = settings->network_zone;
3118 settings->network_zone = NULL;
f757855e
LP		 3119 }
3120 }
3121
3122 if ((arg_settings_mask & SETTING_EXPOSE_PORTS) == 0 &&
3123 settings->expose_ports) {
3124
3125 if (!arg_settings_trusted)
3126 log_warning("Ignoring Port= setting, file %s is not trusted.", p);
3127 else {
3128 expose_port_free_all(arg_expose_ports);
3129 arg_expose_ports = settings->expose_ports;
3130 settings->expose_ports = NULL;
3131 }
3132 }
3133
0de7acce
LP		 3134 if ((arg_settings_mask & SETTING_USERNS) == 0 &&
3135 settings->userns_mode != _USER_NAMESPACE_MODE_INVALID) {
3136
3137 if (!arg_settings_trusted)
3138 log_warning("Ignoring PrivateUsers= and PrivateUsersChown= settings, file %s is not trusted.", p);
3139 else {
3140 arg_userns_mode = settings->userns_mode;
3141 arg_uid_shift = settings->uid_shift;
3142 arg_uid_range = settings->uid_range;
3143 arg_userns_chown = settings->userns_chown;
3144 }
3145 }
3146
9c1e04d0
AP		 3147 if ((arg_settings_mask & SETTING_NOTIFY_READY) == 0)
3148 arg_notify_ready = settings->notify_ready;
3149
960e4569
LP		 3150 if ((arg_settings_mask & SETTING_SYSCALL_FILTER) == 0) {
3151
3152 if (!arg_settings_trusted && !strv_isempty(arg_syscall_whitelist))
3153 log_warning("Ignoring SystemCallFilter= settings, file %s is not trusted.", p);
3154 else {
3155 strv_free(arg_syscall_whitelist);
3156 strv_free(arg_syscall_blacklist);
3157
3158 arg_syscall_whitelist = settings->syscall_whitelist;
3159 arg_syscall_blacklist = settings->syscall_blacklist;
3160
3161 settings->syscall_whitelist = settings->syscall_blacklist = NULL;
3162 }
3163 }
3164
f757855e
LP		 3165 return 0;
3166}
3167
b0067625
ZJS		 3168static int run(int master,
3169 const char* console,
2d845785 3170 DissectedImage *dissected_image,
b0067625
ZJS		 3171 bool interactive,
3172 bool secondary,
3173 FDSet *fds,
3174 char veth_name[IFNAMSIZ], bool *veth_created,
3175 union in_addr_union *exposed,
3176 pid_t *pid, int *ret) {
3177
3178 static const struct sigaction sa = {
3179 .sa_handler = nop_signal_handler,
e28c7cd0 3180 .sa_flags = SA_NOCLDSTOP|SA_RESTART,
b0067625
ZJS		 3181 };
3182
3183 _cleanup_release_lock_file_ LockFile uid_shift_lock = LOCK_FILE_INIT;
3184 _cleanup_close_ int etc_passwd_lock = -1;
3185 _cleanup_close_pair_ int
3186 kmsg_socket_pair[2] = { -1, -1 },
3187 rtnl_socket_pair[2] = { -1, -1 },
3188 pid_socket_pair[2] = { -1, -1 },
3189 uuid_socket_pair[2] = { -1, -1 },
3190 notify_socket_pair[2] = { -1, -1 },
3191 uid_shift_socket_pair[2] = { -1, -1 };
3192 _cleanup_close_ int notify_socket= -1;
3193 _cleanup_(barrier_destroy) Barrier barrier = BARRIER_NULL;
5773024d 3194 _cleanup_(sd_event_source_unrefp) sd_event_source *notify_event_source = NULL;
b0067625
ZJS		 3195 _cleanup_(sd_event_unrefp) sd_event *event = NULL;
3196 _cleanup_(pty_forward_freep) PTYForward *forward = NULL;
3197 _cleanup_(sd_netlink_unrefp) sd_netlink *rtnl = NULL;
3198 ContainerStatus container_status = 0;
3199 char last_char = 0;
3200 int ifi = 0, r;
3201 ssize_t l;
3202 sigset_t mask_chld;
3203
3204 assert_se(sigemptyset(&mask_chld) == 0);
3205 assert_se(sigaddset(&mask_chld, SIGCHLD) == 0);
3206
3207 if (arg_userns_mode == USER_NAMESPACE_PICK) {
3208 /* When we shall pick the UID/GID range, let's first lock /etc/passwd, so that we can safely
3209 * check with getpwuid() if the specific user already exists. Note that /etc might be
3210 * read-only, in which case this will fail with EROFS. But that's really OK, as in that case we
3211 * can be reasonably sure that no users are going to be added. Note that getpwuid() checks are
3212 * really just an extra safety net. We kinda assume that the UID range we allocate from is
3213 * really ours. */
3214
3215 etc_passwd_lock = take_etc_passwd_lock(NULL);
3216 if (etc_passwd_lock < 0 && etc_passwd_lock != -EROFS)
3217 return log_error_errno(etc_passwd_lock, "Failed to take /etc/passwd lock: %m");
3218 }
3219
3220 r = barrier_create(&barrier);
3221 if (r < 0)
3222 return log_error_errno(r, "Cannot initialize IPC barrier: %m");
3223
3224 if (socketpair(AF_UNIX, SOCK_SEQPACKET|SOCK_CLOEXEC, 0, kmsg_socket_pair) < 0)
3225 return log_error_errno(errno, "Failed to create kmsg socket pair: %m");
3226
3227 if (socketpair(AF_UNIX, SOCK_SEQPACKET|SOCK_CLOEXEC, 0, rtnl_socket_pair) < 0)
3228 return log_error_errno(errno, "Failed to create rtnl socket pair: %m");
3229
3230 if (socketpair(AF_UNIX, SOCK_SEQPACKET|SOCK_CLOEXEC, 0, pid_socket_pair) < 0)
3231 return log_error_errno(errno, "Failed to create pid socket pair: %m");
3232
3233 if (socketpair(AF_UNIX, SOCK_SEQPACKET|SOCK_CLOEXEC, 0, uuid_socket_pair) < 0)
3234 return log_error_errno(errno, "Failed to create id socket pair: %m");
3235
3236 if (socketpair(AF_UNIX, SOCK_SEQPACKET|SOCK_CLOEXEC, 0, notify_socket_pair) < 0)
3237 return log_error_errno(errno, "Failed to create notify socket pair: %m");
3238
3239 if (arg_userns_mode != USER_NAMESPACE_NO)
3240 if (socketpair(AF_UNIX, SOCK_SEQPACKET|SOCK_CLOEXEC, 0, uid_shift_socket_pair) < 0)
3241 return log_error_errno(errno, "Failed to create uid shift socket pair: %m");
3242
3243 /* Child can be killed before execv(), so handle SIGCHLD in order to interrupt
3244 * parent's blocking calls and give it a chance to call wait() and terminate. */
3245 r = sigprocmask(SIG_UNBLOCK, &mask_chld, NULL);
3246 if (r < 0)
3247 return log_error_errno(errno, "Failed to change the signal mask: %m");
3248
3249 r = sigaction(SIGCHLD, &sa, NULL);
3250 if (r < 0)
3251 return log_error_errno(errno, "Failed to install SIGCHLD handler: %m");
3252
3253 *pid = raw_clone(SIGCHLD|CLONE_NEWNS);
3254 if (*pid < 0)
3255 return log_error_errno(errno, "clone() failed%s: %m",
3256 errno == EINVAL ?
3257 ", do you have namespace support enabled in your kernel? (You need UTS, IPC, PID and NET namespacing built in)" : "");
3258
3259 if (*pid == 0) {
3260 /* The outer child only has a file system namespace. */
3261 barrier_set_role(&barrier, BARRIER_CHILD);
3262
3263 master = safe_close(master);
3264
3265 kmsg_socket_pair[0] = safe_close(kmsg_socket_pair[0]);
3266 rtnl_socket_pair[0] = safe_close(rtnl_socket_pair[0]);
3267 pid_socket_pair[0] = safe_close(pid_socket_pair[0]);
3268 uuid_socket_pair[0] = safe_close(uuid_socket_pair[0]);
3269 notify_socket_pair[0] = safe_close(notify_socket_pair[0]);
3270 uid_shift_socket_pair[0] = safe_close(uid_shift_socket_pair[0]);
3271
3272 (void) reset_all_signal_handlers();
3273 (void) reset_signal_mask();
3274
3275 r = outer_child(&barrier,
3276 arg_directory,
3277 console,
2d845785 3278 dissected_image,
b0067625
ZJS		 3279 interactive,
3280 secondary,
3281 pid_socket_pair[1],
3282 uuid_socket_pair[1],
3283 notify_socket_pair[1],
3284 kmsg_socket_pair[1],
3285 rtnl_socket_pair[1],
3286 uid_shift_socket_pair[1],
3287 fds);
3288 if (r < 0)
3289 _exit(EXIT_FAILURE);
3290
3291 _exit(EXIT_SUCCESS);
3292 }
3293
3294 barrier_set_role(&barrier, BARRIER_PARENT);
3295
3296 fds = fdset_free(fds);
3297
3298 kmsg_socket_pair[1] = safe_close(kmsg_socket_pair[1]);
3299 rtnl_socket_pair[1] = safe_close(rtnl_socket_pair[1]);
3300 pid_socket_pair[1] = safe_close(pid_socket_pair[1]);
3301 uuid_socket_pair[1] = safe_close(uuid_socket_pair[1]);
3302 notify_socket_pair[1] = safe_close(notify_socket_pair[1]);
3303 uid_shift_socket_pair[1] = safe_close(uid_shift_socket_pair[1]);
3304
3305 if (arg_userns_mode != USER_NAMESPACE_NO) {
3306 /* The child just let us know the UID shift it might have read from the image. */
3307 l = recv(uid_shift_socket_pair[0], &arg_uid_shift, sizeof arg_uid_shift, 0);
3308 if (l < 0)
3309 return log_error_errno(errno, "Failed to read UID shift: %m");
b0067625
ZJS		 3310 if (l != sizeof arg_uid_shift) {
3311 log_error("Short read while reading UID shift.");
3312 return -EIO;
3313 }
3314
3315 if (arg_userns_mode == USER_NAMESPACE_PICK) {
3316 /* If we are supposed to pick the UID shift, let's try to use the shift read from the
3317 * image, but if that's already in use, pick a new one, and report back to the child,
3318 * which one we now picked. */
3319
3320 r = uid_shift_pick(&arg_uid_shift, &uid_shift_lock);
3321 if (r < 0)
3322 return log_error_errno(r, "Failed to pick suitable UID/GID range: %m");
3323
3324 l = send(uid_shift_socket_pair[0], &arg_uid_shift, sizeof arg_uid_shift, MSG_NOSIGNAL);
3325 if (l < 0)
3326 return log_error_errno(errno, "Failed to send UID shift: %m");
3327 if (l != sizeof arg_uid_shift) {
3328 log_error("Short write while writing UID shift.");
3329 return -EIO;
3330 }
3331 }
3332 }
3333
3334 /* Wait for the outer child. */
3335 r = wait_for_terminate_and_warn("namespace helper", *pid, NULL);
3336 if (r != 0)
3337 return r < 0 ? r : -EIO;
3338
3339 /* And now retrieve the PID of the inner child. */
3340 l = recv(pid_socket_pair[0], pid, sizeof *pid, 0);
3341 if (l < 0)
3342 return log_error_errno(errno, "Failed to read inner child PID: %m");
3343 if (l != sizeof *pid) {
3344 log_error("Short read while reading inner child PID.");
3345 return -EIO;
3346 }
3347
3348 /* We also retrieve container UUID in case it was generated by outer child */
3349 l = recv(uuid_socket_pair[0], &arg_uuid, sizeof arg_uuid, 0);
3350 if (l < 0)
3351 return log_error_errno(errno, "Failed to read container machine ID: %m");
3352 if (l != sizeof(arg_uuid)) {
3353 log_error("Short read while reading container machined ID.");
3354 return -EIO;
3355 }
3356
3357 /* We also retrieve the socket used for notifications generated by outer child */
3358 notify_socket = receive_one_fd(notify_socket_pair[0], 0);
3359 if (notify_socket < 0)
3360 return log_error_errno(notify_socket,
3361 "Failed to receive notification socket from the outer child: %m");
3362
3363 log_debug("Init process invoked as PID "PID_FMT, *pid);
3364
3365 if (arg_userns_mode != USER_NAMESPACE_NO) {
3366 if (!barrier_place_and_sync(&barrier)) { /* #1 */
3367 log_error("Child died too early.");
3368 return -ESRCH;
3369 }
3370
3371 r = setup_uid_map(*pid);
3372 if (r < 0)
3373 return r;
3374
3375 (void) barrier_place(&barrier); /* #2 */
3376 }
3377
3378 if (arg_private_network) {
3379
3380 r = move_network_interfaces(*pid, arg_network_interfaces);
3381 if (r < 0)
3382 return r;
3383
3384 if (arg_network_veth) {
3385 r = setup_veth(arg_machine, *pid, veth_name,
3386 arg_network_bridge || arg_network_zone);
3387 if (r < 0)
3388 return r;
3389 else if (r > 0)
3390 ifi = r;
3391
3392 if (arg_network_bridge) {
3393 /* Add the interface to a bridge */
3394 r = setup_bridge(veth_name, arg_network_bridge, false);
3395 if (r < 0)
3396 return r;
3397 if (r > 0)
3398 ifi = r;
3399 } else if (arg_network_zone) {
3400 /* Add the interface to a bridge, possibly creating it */
3401 r = setup_bridge(veth_name, arg_network_zone, true);
3402 if (r < 0)
3403 return r;
3404 if (r > 0)
3405 ifi = r;
3406 }
3407 }
3408
3409 r = setup_veth_extra(arg_machine, *pid, arg_network_veth_extra);
3410 if (r < 0)
3411 return r;
3412
3413 /* We created the primary and extra veth links now; let's remember this, so that we know to
3414 remove them later on. Note that we don't bother with removing veth links that were created
3415 here when their setup failed half-way, because in that case the kernel should be able to
3416 remove them on its own, since they cannot be referenced by anything yet. */
3417 *veth_created = true;
3418
3419 r = setup_macvlan(arg_machine, *pid, arg_network_macvlan);
3420 if (r < 0)
3421 return r;
3422
3423 r = setup_ipvlan(arg_machine, *pid, arg_network_ipvlan);
3424 if (r < 0)
3425 return r;
3426 }
3427
3428 if (arg_register) {
3429 r = register_machine(
3430 arg_machine,
3431 *pid,
3432 arg_directory,
3433 arg_uuid,
3434 ifi,
3435 arg_slice,
3436 arg_custom_mounts, arg_n_custom_mounts,
3437 arg_kill_signal,
3438 arg_property,
3439 arg_keep_unit,
3440 arg_container_service_name);
3441 if (r < 0)
3442 return r;
cd2dfc6f
LP		 3443 } else if (!arg_keep_unit) {
3444 r = allocate_scope(
3445 arg_machine,
3446 *pid,
3447 arg_slice,
3448 arg_custom_mounts, arg_n_custom_mounts,
3449 arg_kill_signal,
3450 arg_property);
3451 if (r < 0)
3452 return r;
3453
3454 } else if (arg_slice || arg_property)
3455 log_notice("Machine and scope registration turned off, --slice= and --property= settings will have no effect.");
b0067625 3456
f0bef277 3457 r = sync_cgroup(*pid, arg_unified_cgroup_hierarchy, arg_uid_shift);
b0067625
ZJS		 3458 if (r < 0)
3459 return r;
3460
3461 if (arg_keep_unit) {
3462 r = create_subcgroup(*pid, arg_unified_cgroup_hierarchy);
3463 if (r < 0)
3464 return r;
3465 }
3466
3467 r = chown_cgroup(*pid, arg_uid_shift);
3468 if (r < 0)
3469 return r;
3470
3471 /* Notify the child that the parent is ready with all
3472 * its setup (including cgroup-ification), and that
3473 * the child can now hand over control to the code to
3474 * run inside the container. */
3475 (void) barrier_place(&barrier); /* #3 */
3476
3477 /* Block SIGCHLD here, before notifying child.
3478 * process_pty() will handle it with the other signals. */
3479 assert_se(sigprocmask(SIG_BLOCK, &mask_chld, NULL) >= 0);
3480
3481 /* Reset signal to default */
3482 r = default_signals(SIGCHLD, -1);
3483 if (r < 0)
3484 return log_error_errno(r, "Failed to reset SIGCHLD: %m");
3485
3486 r = sd_event_new(&event);
3487 if (r < 0)
3488 return log_error_errno(r, "Failed to get default event source: %m");
3489
5773024d 3490 r = setup_sd_notify_parent(event, notify_socket, PID_TO_PTR(*pid), &notify_event_source);
b0067625
ZJS		 3491 if (r < 0)
3492 return r;
3493
3494 /* Let the child know that we are ready and wait that the child is completely ready now. */
3495 if (!barrier_place_and_sync(&barrier)) { /* #4 */
3496 log_error("Child died too early.");
3497 return -ESRCH;
3498 }
3499
3500 /* At this point we have made use of the UID we picked, and thus nss-mymachines
3501 * will make them appear in getpwuid(), thus we can release the /etc/passwd lock. */
3502 etc_passwd_lock = safe_close(etc_passwd_lock);
3503
3504 sd_notifyf(false,
3505 "STATUS=Container running.\n"
3506 "X_NSPAWN_LEADER_PID=" PID_FMT, *pid);
3507 if (!arg_notify_ready)
3508 sd_notify(false, "READY=1\n");
3509
3510 if (arg_kill_signal > 0) {
3511 /* Try to kill the init system on SIGINT or SIGTERM */
3512 sd_event_add_signal(event, NULL, SIGINT, on_orderly_shutdown, PID_TO_PTR(*pid));
3513 sd_event_add_signal(event, NULL, SIGTERM, on_orderly_shutdown, PID_TO_PTR(*pid));
3514 } else {
3515 /* Immediately exit */
3516 sd_event_add_signal(event, NULL, SIGINT, NULL, NULL);
3517 sd_event_add_signal(event, NULL, SIGTERM, NULL, NULL);
3518 }
3519
6916b164
AU		 3520 /* Exit when the child exits */
3521 sd_event_add_signal(event, NULL, SIGCHLD, on_sigchld, PID_TO_PTR(*pid));
b0067625
ZJS		 3522
3523 if (arg_expose_ports) {
3524 r = expose_port_watch_rtnl(event, rtnl_socket_pair[0], on_address_change, exposed, &rtnl);
3525 if (r < 0)
3526 return r;
3527
3528 (void) expose_port_execute(rtnl, arg_expose_ports, exposed);
3529 }
3530
3531 rtnl_socket_pair[0] = safe_close(rtnl_socket_pair[0]);
3532
3533 r = pty_forward_new(event, master,
3534 PTY_FORWARD_IGNORE_VHANGUP | (interactive ? 0 : PTY_FORWARD_READ_ONLY),
3535 &forward);
3536 if (r < 0)
3537 return log_error_errno(r, "Failed to create PTY forwarder: %m");
3538
3539 r = sd_event_loop(event);
3540 if (r < 0)
3541 return log_error_errno(r, "Failed to run event loop: %m");
3542
3543 pty_forward_get_last_char(forward, &last_char);
3544
3545 forward = pty_forward_free(forward);
3546
3547 if (!arg_quiet && last_char != '\n')
3548 putc('\n', stdout);
3549
3550 /* Kill if it is not dead yet anyway */
3551 if (arg_register && !arg_keep_unit)
3552 terminate_machine(*pid);
3553
3554 /* Normally redundant, but better safe than sorry */
c67b0082 3555 (void) kill(*pid, SIGKILL);
b0067625
ZJS		 3556
3557 r = wait_for_container(*pid, &container_status);
3558 *pid = 0;
3559
3560 if (r < 0)
3561 /* We failed to wait for the container, or the container exited abnormally. */
3562 return r;
3563 if (r > 0 || container_status == CONTAINER_TERMINATED) {
27e29a1e
ZJS		 3564 /* r > 0 → The container exited with a non-zero status.
3565 * As a special case, we need to replace 133 with a different value,
3566 * because 133 is special-cased in the service file to reboot the container.
3567 * otherwise → The container exited with zero status and a reboot was not requested.
3568 */
2a49b612 3569 if (r == EXIT_FORCE_RESTART)
27e29a1e 3570 r = EXIT_FAILURE; /* replace 133 with the general failure code */
b0067625 3571 *ret = r;
b0067625
ZJS		 3572 return 0; /* finito */
3573 }
3574
3575 /* CONTAINER_REBOOTED, loop again */
3576
3577 if (arg_keep_unit) {
3578 /* Special handling if we are running as a service: instead of simply
3579 * restarting the machine we want to restart the entire service, so let's
3580 * inform systemd about this with the special exit code 133. The service
3581 * file uses RestartForceExitStatus=133 so that this results in a full
3582 * nspawn restart. This is necessary since we might have cgroup parameters
3583 * set we want to have flushed out. */
2a49b612
ZJS		 3584 *ret = EXIT_FORCE_RESTART;
3585 return 0; /* finito */
b0067625
ZJS		 3586 }
3587
3588 expose_port_flush(arg_expose_ports, exposed);
3589
3590 (void) remove_veth_links(veth_name, arg_network_veth_extra);
3591 *veth_created = false;
3592 return 1; /* loop again */
3593}
3594
03cfe0d5
LP		 3595int main(int argc, char *argv[]) {
3596
2d845785
LP		 3597 _cleanup_free_ char *console = NULL;
3598 _cleanup_close_ int master = -1;
03cfe0d5 3599 _cleanup_fdset_free_ FDSet *fds = NULL;
2d845785 3600 int r, n_fd_passed, ret = EXIT_SUCCESS;
5aa3eba5 3601 char veth_name[IFNAMSIZ] = "";
17cbb288 3602 bool secondary = false, remove_directory = false, remove_image = false;
03cfe0d5 3603 pid_t pid = 0;
03cfe0d5
LP		 3604 union in_addr_union exposed = {};
3605 _cleanup_release_lock_file_ LockFile tree_global_lock = LOCK_FILE_INIT, tree_local_lock = LOCK_FILE_INIT;
c67b0082
LP		 3606 bool interactive, veth_created = false, remove_tmprootdir = false;
3607 char tmprootdir[] = "/tmp/nspawn-root-XXXXXX";
2d845785 3608 _cleanup_(loop_device_unrefp) LoopDevice *loop = NULL;
18b5886e
LP		 3609 _cleanup_(decrypted_image_unrefp) DecryptedImage *decrypted_image = NULL;
3610 _cleanup_(dissected_image_unrefp) DissectedImage *dissected_image = NULL;
03cfe0d5
LP		 3611
3612 log_parse_environment();
3613 log_open();
415fc41c 3614
7732f92b
LP		 3615 /* Make sure rename_process() in the stub init process can work */
3616 saved_argv = argv;
3617 saved_argc = argc;
3618
03cfe0d5
LP		 3619 r = parse_argv(argc, argv);
3620 if (r <= 0)
3621 goto finish;
3622
03cfe0d5
LP		 3623 if (geteuid() != 0) {
3624 log_error("Need to be root.");
3625 r = -EPERM;
3626 goto finish;
3627 }
f757855e
LP		 3628 r = determine_names();
3629 if (r < 0)
3630 goto finish;
3631
3632 r = load_settings();
3633 if (r < 0)
3634 goto finish;
3635
3636 r = verify_arguments();
3637 if (r < 0)
3638 goto finish;
03cfe0d5
LP		 3639
3640 n_fd_passed = sd_listen_fds(false);
3641 if (n_fd_passed > 0) {
3642 r = fdset_new_listen_fds(&fds, false);
3643 if (r < 0) {
3644 log_error_errno(r, "Failed to collect file descriptors: %m");
3645 goto finish;
3646 }
3647 }
3648
3649 if (arg_directory) {
3650 assert(!arg_image);
3651
3652 if (path_equal(arg_directory, "/") && !arg_ephemeral) {
3653 log_error("Spawning container on root directory is not supported. Consider using --ephemeral.");
3654 r = -EINVAL;
3655 goto finish;
3656 }
3657
3658 if (arg_ephemeral) {
3659 _cleanup_free_ char *np = NULL;
3660
8d4aa2bb 3661 r = chase_symlinks_and_update(&arg_directory, 0);
3f342ec4
LP		 3662 if (r < 0)
3663 goto finish;
3664
03cfe0d5
LP		 3665 /* If the specified path is a mount point we
3666 * generate the new snapshot immediately
3667 * inside it under a random name. However if
3668 * the specified is not a mount point we
3669 * create the new snapshot in the parent
3670 * directory, just next to it. */
e1873695 3671 r = path_is_mount_point(arg_directory, NULL, 0);
03cfe0d5
LP		 3672 if (r < 0) {
3673 log_error_errno(r, "Failed to determine whether directory %s is mount point: %m", arg_directory);
3674 goto finish;
3675 }
3676 if (r > 0)
770b5ce4 3677 r = tempfn_random_child(arg_directory, "machine.", &np);
03cfe0d5 3678 else
770b5ce4 3679 r = tempfn_random(arg_directory, "machine.", &np);
03cfe0d5 3680 if (r < 0) {
0f3be6ca 3681 log_error_errno(r, "Failed to generate name for directory snapshot: %m");
03cfe0d5
LP		 3682 goto finish;
3683 }
3684
3685 r = image_path_lock(np, (arg_read_only ? LOCK_SH : LOCK_EX) | LOCK_NB, &tree_global_lock, &tree_local_lock);
3686 if (r < 0) {
3687 log_error_errno(r, "Failed to lock %s: %m", np);
3688 goto finish;
3689 }
3690
17cbb288
LP		 3691 r = btrfs_subvol_snapshot(arg_directory, np,
3692 (arg_read_only ? BTRFS_SNAPSHOT_READ_ONLY : 0) |
3693 BTRFS_SNAPSHOT_FALLBACK_COPY |
3694 BTRFS_SNAPSHOT_FALLBACK_DIRECTORY |
3695 BTRFS_SNAPSHOT_RECURSIVE |
3696 BTRFS_SNAPSHOT_QUOTA);
03cfe0d5
LP		 3697 if (r < 0) {
3698 log_error_errno(r, "Failed to create snapshot %s from %s: %m", np, arg_directory);
3699 goto finish;
ec16945e
LP		 3700 }
3701
3702 free(arg_directory);
3703 arg_directory = np;
8a16a7b4 3704 np = NULL;
ec16945e 3705
17cbb288 3706 remove_directory = true;
30535c16
LP		 3707
3708 } else {
cb638b5e 3709 r = chase_symlinks_and_update(&arg_directory, arg_template ? CHASE_NONEXISTENT : 0);
8d4aa2bb
LP		 3710 if (r < 0)
3711 goto finish;
3712
30535c16
LP		 3713 r = image_path_lock(arg_directory, (arg_read_only ? LOCK_SH : LOCK_EX) | LOCK_NB, &tree_global_lock, &tree_local_lock);
3714 if (r == -EBUSY) {
3715 log_error_errno(r, "Directory tree %s is currently busy.", arg_directory);
3716 goto finish;
3717 }
3718 if (r < 0) {
3719 log_error_errno(r, "Failed to lock %s: %m", arg_directory);
476b8254 3720 goto finish;
30535c16
LP		 3721 }
3722
3723 if (arg_template) {
8d4aa2bb 3724 r = chase_symlinks_and_update(&arg_template, 0);
3f342ec4
LP		 3725 if (r < 0)
3726 goto finish;
3727
17cbb288
LP		 3728 r = btrfs_subvol_snapshot(arg_template, arg_directory,
3729 (arg_read_only ? BTRFS_SNAPSHOT_READ_ONLY : 0) |
3730 BTRFS_SNAPSHOT_FALLBACK_COPY |
3731 BTRFS_SNAPSHOT_FALLBACK_DIRECTORY |
3732 BTRFS_SNAPSHOT_FALLBACK_IMMUTABLE |
3733 BTRFS_SNAPSHOT_RECURSIVE |
3734 BTRFS_SNAPSHOT_QUOTA);
30535c16
LP		 3735 if (r == -EEXIST) {
3736 if (!arg_quiet)
3737 log_info("Directory %s already exists, not populating from template %s.", arg_directory, arg_template);
3738 } else if (r < 0) {
83521414 3739 log_error_errno(r, "Couldn't create snapshot %s from %s: %m", arg_directory, arg_template);
30535c16
LP		 3740 goto finish;
3741 } else {
3742 if (!arg_quiet)
3743 log_info("Populated %s from template %s.", arg_directory, arg_template);
3744 }
3745 }
ec16945e
LP		 3746 }
3747
7732f92b 3748 if (arg_start_mode == START_BOOT) {
1b9e5b12 3749 if (path_is_os_tree(arg_directory) <= 0) {
5ae4d543 3750 log_error("Directory %s doesn't look like an OS root directory (os-release file is missing). Refusing.", arg_directory);
ec16945e 3751 r = -EINVAL;
1b9e5b12
LP		 3752 goto finish;
3753 }
3754 } else {
3755 const char *p;
3756
16fb773e
LP		 3757 p = strjoina(arg_directory, "/usr/");
3758 if (laccess(p, F_OK) < 0) {
3759 log_error("Directory %s doesn't look like it has an OS tree. Refusing.", arg_directory);
ec16945e 3760 r = -EINVAL;
1b9e5b12 3761 goto finish;
1b9e5b12
LP		 3762 }
3763 }
ec16945e 3764
6b9132a9 3765 } else {
ec16945e
LP		 3766 assert(arg_image);
3767 assert(!arg_template);
3768
8d4aa2bb 3769 r = chase_symlinks_and_update(&arg_image, 0);
3f342ec4
LP		 3770 if (r < 0)
3771 goto finish;
3772
0f3be6ca
LP		 3773 if (arg_ephemeral) {
3774 _cleanup_free_ char *np = NULL;
3775
3776 r = tempfn_random(arg_image, "machine.", &np);
3777 if (r < 0) {
3778 log_error_errno(r, "Failed to generate name for image snapshot: %m");
3779 goto finish;
3780 }
3781
3782 r = image_path_lock(np, (arg_read_only ? LOCK_SH : LOCK_EX) | LOCK_NB, &tree_global_lock, &tree_local_lock);
3783 if (r < 0) {
3784 r = log_error_errno(r, "Failed to create image lock: %m");
3785 goto finish;
3786 }
3787
1c876927 3788 r = copy_file(arg_image, np, O_EXCL, arg_read_only ? 0400 : 0600, FS_NOCOW_FL, COPY_REFLINK);
0f3be6ca
LP		 3789 if (r < 0) {
3790 r = log_error_errno(r, "Failed to copy image file: %m");
3791 goto finish;
3792 }
3793
3794 free(arg_image);
3795 arg_image = np;
3796 np = NULL;
3797
3798 remove_image = true;
3799 } else {
3800 r = image_path_lock(arg_image, (arg_read_only ? LOCK_SH : LOCK_EX) | LOCK_NB, &tree_global_lock, &tree_local_lock);
3801 if (r == -EBUSY) {
3802 r = log_error_errno(r, "Disk image %s is currently busy.", arg_image);
3803 goto finish;
3804 }
3805 if (r < 0) {
3806 r = log_error_errno(r, "Failed to create image lock: %m");
3807 goto finish;
3808 }
4623e8e6 3809
78ebe980
LP		 3810 if (!arg_root_hash) {
3811 r = root_hash_load(arg_image, &arg_root_hash, &arg_root_hash_size);
3812 if (r < 0) {
3813 log_error_errno(r, "Failed to load root hash file for %s: %m", arg_image);
3814 goto finish;
3815 }
3816 }
30535c16
LP		 3817 }
3818
c67b0082 3819 if (!mkdtemp(tmprootdir)) {
0f3be6ca 3820 r = log_error_errno(errno, "Failed to create temporary directory: %m");
6b9132a9 3821 goto finish;
1b9e5b12 3822 }
6b9132a9 3823
c67b0082
LP		 3824 remove_tmprootdir = true;
3825
3826 arg_directory = strdup(tmprootdir);
1b9e5b12
LP		 3827 if (!arg_directory) {
3828 r = log_oom();
3829 goto finish;
6b9132a9 3830 }
88213476 3831
2d845785
LP		 3832 r = loop_device_make_by_path(arg_image, arg_read_only ? O_RDONLY : O_RDWR, &loop);
3833 if (r < 0) {
3834 log_error_errno(r, "Failed to set up loopback block device: %m");
842f3b0f
LP		 3835 goto finish;
3836 }
1b9e5b12 3837
e0f9e7bd
LP		 3838 r = dissect_image(
3839 loop->fd,
3840 arg_root_hash, arg_root_hash_size,
3841 DISSECT_IMAGE_REQUIRE_ROOT,
3842 &dissected_image);
2d845785
LP		 3843 if (r == -ENOPKG) {
3844 log_error_errno(r, "Could not find a suitable file system or partition table in image: %s", arg_image);
3845
3846 log_notice("Note that the disk image needs to\n"
3847 " a) either contain only a single MBR partition of type 0x83 that is marked bootable\n"
3848 " b) or contain a single GPT partition of type 0FC63DAF-8483-4772-8E79-3D69D8477DE4\n"
3849 " c) or follow http://www.freedesktop.org/wiki/Specifications/DiscoverablePartitionsSpec/\n"
3850 " d) or contain a file system without a partition table\n"
3851 "in order to be bootable with systemd-nspawn.");
1b9e5b12 3852 goto finish;
2d845785 3853 }
4623e8e6
LP		 3854 if (r == -EADDRNOTAVAIL) {
3855 log_error_errno(r, "No root partition for specified root hash found.");
3856 goto finish;
3857 }
2d845785
LP		 3858 if (r == -EOPNOTSUPP) {
3859 log_error_errno(r, "--image= is not supported, compiled without blkid support.");
3860 goto finish;
3861 }
3862 if (r < 0) {
3863 log_error_errno(r, "Failed to dissect image: %m");
842f3b0f
LP		 3864 goto finish;
3865 }
1b9e5b12 3866
4623e8e6
LP		 3867 if (!arg_root_hash && dissected_image->can_verity)
3868 log_notice("Note: image %s contains verity information, but no root hash specified! Proceeding without integrity checking.", arg_image);
3869
3870 r = dissected_image_decrypt_interactively(dissected_image, NULL, arg_root_hash, arg_root_hash_size, 0, &decrypted_image);
1b9e5b12
LP		 3871 if (r < 0)
3872 goto finish;
0f3be6ca
LP		 3873
3874 /* Now that we mounted the image, let's try to remove it again, if it is ephemeral */
3875 if (remove_image && unlink(arg_image) >= 0)
3876 remove_image = false;
842f3b0f 3877 }
842f3b0f 3878
86c0dd4a 3879 r = custom_mount_prepare_all(arg_directory, arg_custom_mounts, arg_n_custom_mounts);
5a8af538
LP		 3880 if (r < 0)
3881 goto finish;
bd15ab41
TH		 3882
3883 r = detect_unified_cgroup_hierarchy(arg_directory);
3884 if (r < 0)
3885 goto finish;
5a8af538 3886
03cfe0d5
LP		 3887 interactive =
3888 isatty(STDIN_FILENO) > 0 &&
3889 isatty(STDOUT_FILENO) > 0;
9c857b9d 3890
db7feb7e
LP		 3891 master = posix_openpt(O_RDWR|O_NOCTTY|O_CLOEXEC|O_NDELAY);
3892 if (master < 0) {
ec16945e 3893 r = log_error_errno(errno, "Failed to acquire pseudo tty: %m");
a258bf26
LP		 3894 goto finish;
3895 }
3896
611b312b
LP		 3897 r = ptsname_malloc(master, &console);
3898 if (r < 0) {
3899 r = log_error_errno(r, "Failed to determine tty name: %m");
a258bf26 3900 goto finish;
68b02049
DW		 3901 }
3902
3903 if (arg_selinux_apifs_context) {
3904 r = mac_selinux_apply(console, arg_selinux_apifs_context);
3905 if (r < 0)
3906 goto finish;
a258bf26
LP		 3907 }
3908
a258bf26 3909 if (unlockpt(master) < 0) {
ec16945e 3910 r = log_error_errno(errno, "Failed to unlock tty: %m");
a258bf26
LP		 3911 goto finish;
3912 }
3913
9c857b9d
LP		 3914 if (!arg_quiet)
3915 log_info("Spawning container %s on %s.\nPress ^] three times within 1s to kill container.",
3916 arg_machine, arg_image ?: arg_directory);
3917
72c0a2c2 3918 assert_se(sigprocmask_many(SIG_BLOCK, NULL, SIGCHLD, SIGWINCH, SIGTERM, SIGINT, -1) >= 0);
a258bf26 3919
03cfe0d5
LP		 3920 if (prctl(PR_SET_CHILD_SUBREAPER, 1) < 0) {
3921 r = log_error_errno(errno, "Failed to become subreaper: %m");
3922 goto finish;
3923 }
3924
d87be9b0 3925 for (;;) {
b0067625
ZJS		 3926 r = run(master,
3927 console,
2d845785 3928 dissected_image,
b0067625
ZJS		 3929 interactive, secondary,
3930 fds,
3931 veth_name, &veth_created,
3932 &exposed,
3933 &pid, &ret);
3934 if (r <= 0)
d87be9b0 3935 break;
d87be9b0 3936 }
88213476
LP		 3937
3938finish:
af4ec430 3939 sd_notify(false,
2a49b612
ZJS		 3940 r == 0 && ret == EXIT_FORCE_RESTART ? "STOPPING=1\nSTATUS=Restarting..." :
3941 "STOPPING=1\nSTATUS=Terminating...");
af4ec430 3942
9444b1f2 3943 if (pid > 0)
c67b0082 3944 (void) kill(pid, SIGKILL);
88213476 3945
503546da 3946 /* Try to flush whatever is still queued in the pty */
6a0f896b 3947 if (master >= 0) {
1c876927 3948 (void) copy_bytes(master, STDOUT_FILENO, (uint64_t) -1, 0);
6a0f896b
LP		 3949 master = safe_close(master);
3950 }
3951
3952 if (pid > 0)
3953 (void) wait_for_terminate(pid, NULL);
503546da 3954
17cbb288 3955 if (remove_directory && arg_directory) {
ec16945e
LP		 3956 int k;
3957
17cbb288 3958 k = rm_rf(arg_directory, REMOVE_ROOT|REMOVE_PHYSICAL|REMOVE_SUBVOLUME);
ec16945e 3959 if (k < 0)
17cbb288 3960 log_warning_errno(k, "Cannot remove '%s', ignoring: %m", arg_directory);
ec16945e
LP		 3961 }
3962
0f3be6ca
LP		 3963 if (remove_image && arg_image) {
3964 if (unlink(arg_image) < 0)
3965 log_warning_errno(errno, "Can't remove image file '%s', ignoring: %m", arg_image);
3966 }
3967
c67b0082
LP		 3968 if (remove_tmprootdir) {
3969 if (rmdir(tmprootdir) < 0)
3970 log_debug_errno(errno, "Can't remove temporary root directory '%s', ignoring: %m", tmprootdir);
3971 }
3972
785890ac
LP		 3973 if (arg_machine) {
3974 const char *p;
3975
63c372cb 3976 p = strjoina("/run/systemd/nspawn/propagate/", arg_machine);
c6878637 3977 (void) rm_rf(p, REMOVE_ROOT);
785890ac
LP		 3978 }
3979
7a8f6325 3980 expose_port_flush(arg_expose_ports, &exposed);
7513c5b8
LP		 3981
3982 if (veth_created)
3983 (void) remove_veth_links(veth_name, arg_network_veth_extra);
22b28dfd 3984 (void) remove_bridge(arg_network_zone);
f757855e 3985
04d391da 3986 free(arg_directory);
ec16945e
LP		 3987 free(arg_template);
3988 free(arg_image);
7027ff61 3989 free(arg_machine);
c74e630d 3990 free(arg_user);
b53ede69
PW		 3991 free(arg_pivot_root_new);
3992 free(arg_pivot_root_old);
5f932eb9 3993 free(arg_chdir);
c74e630d 3994 strv_free(arg_setenv);
f757855e 3995 free(arg_network_bridge);
c74e630d
LP		 3996 strv_free(arg_network_interfaces);
3997 strv_free(arg_network_macvlan);
4bbfe7ad 3998 strv_free(arg_network_ipvlan);
f6d6bad1 3999 strv_free(arg_network_veth_extra);
f757855e
LP		 4000 strv_free(arg_parameters);
4001 custom_mount_free_all(arg_custom_mounts, arg_n_custom_mounts);
4002 expose_port_free_all(arg_expose_ports);
4623e8e6 4003 free(arg_root_hash);
6d0b55c2 4004
ec16945e 4005 return r < 0 ? EXIT_FAILURE : ret;
88213476 4006}
Unnamed repository; edit this file 'description' to name the repository.