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Merge pull request #5801 from keszybz/help-error
[thirdparty/systemd.git] / src / nspawn / nspawn.c
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
7 under the terms of the GNU Lesser General Public License as published by
8 the Free Software Foundation; either version 2.1 of the License, or
9 (at your option) any later version.
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
14 Lesser General Public License for more details.
15
16 You should have received a copy of the GNU Lesser General Public License
17 along with systemd; If not, see <http://www.gnu.org/licenses/>.
18 ***/
19
20 #ifdef HAVE_BLKID
21 #include <blkid.h>
22 #endif
23 #include <errno.h>
24 #include <getopt.h>
25 #include <grp.h>
26 #include <linux/loop.h>
27 #include <pwd.h>
28 #include <sched.h>
29 #ifdef HAVE_SELINUX
30 #include <selinux/selinux.h>
31 #endif
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>
41 #include <sys/wait.h>
42 #include <unistd.h>
43
44 #include "sd-bus.h"
45 #include "sd-daemon.h"
46 #include "sd-id128.h"
47
48 #include "alloc-util.h"
49 #include "barrier.h"
50 #include "base-filesystem.h"
51 #include "blkid-util.h"
52 #include "btrfs-util.h"
53 #include "bus-util.h"
54 #include "cap-list.h"
55 #include "capability-util.h"
56 #include "cgroup-util.h"
57 #include "copy.h"
58 #include "dev-setup.h"
59 #include "dissect-image.h"
60 #include "env-util.h"
61 #include "fd-util.h"
62 #include "fdset.h"
63 #include "fileio.h"
64 #include "format-util.h"
65 #include "fs-util.h"
66 #include "gpt.h"
67 #include "hexdecoct.h"
68 #include "hostname-util.h"
69 #include "id128-util.h"
70 #include "log.h"
71 #include "loop-util.h"
72 #include "loopback-setup.h"
73 #include "machine-image.h"
74 #include "macro.h"
75 #include "missing.h"
76 #include "mkdir.h"
77 #include "mount-util.h"
78 #include "netlink-util.h"
79 #include "nspawn-cgroup.h"
80 #include "nspawn-expose-ports.h"
81 #include "nspawn-mount.h"
82 #include "nspawn-network.h"
83 #include "nspawn-patch-uid.h"
84 #include "nspawn-register.h"
85 #include "nspawn-seccomp.h"
86 #include "nspawn-settings.h"
87 #include "nspawn-setuid.h"
88 #include "nspawn-stub-pid1.h"
89 #include "parse-util.h"
90 #include "path-util.h"
91 #include "process-util.h"
92 #include "ptyfwd.h"
93 #include "random-util.h"
94 #include "raw-clone.h"
95 #include "rm-rf.h"
96 #include "selinux-util.h"
97 #include "signal-util.h"
98 #include "socket-util.h"
99 #include "stat-util.h"
100 #include "stdio-util.h"
101 #include "string-util.h"
102 #include "strv.h"
103 #include "terminal-util.h"
104 #include "udev-util.h"
105 #include "umask-util.h"
106 #include "user-util.h"
107 #include "util.h"
108
109 /* Note that devpts's gid= parameter parses GIDs as signed values, hence we stay away from the upper half of the 32bit
110 * UID range here. We leave a bit of room at the lower end and a lot of room at the upper end, so that other subsystems
111 * may have their own allocation ranges too. */
112 #define UID_SHIFT_PICK_MIN ((uid_t) UINT32_C(0x00080000))
113 #define UID_SHIFT_PICK_MAX ((uid_t) UINT32_C(0x6FFF0000))
114
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"
119
120 #define EXIT_FORCE_RESTART 133
121
122 typedef enum ContainerStatus {
123 CONTAINER_TERMINATED,
124 CONTAINER_REBOOTED
125 } ContainerStatus;
126
127 typedef enum LinkJournal {
128 LINK_NO,
129 LINK_AUTO,
130 LINK_HOST,
131 LINK_GUEST
132 } LinkJournal;
133
134 static char *arg_directory = NULL;
135 static char *arg_template = NULL;
136 static char *arg_chdir = NULL;
137 static char *arg_pivot_root_new = NULL;
138 static char *arg_pivot_root_old = NULL;
139 static char *arg_user = NULL;
140 static sd_id128_t arg_uuid = {};
141 static char *arg_machine = NULL;
142 static const char *arg_selinux_context = NULL;
143 static const char *arg_selinux_apifs_context = NULL;
144 static const char *arg_slice = NULL;
145 static bool arg_private_network = false;
146 static bool arg_read_only = false;
147 static StartMode arg_start_mode = START_PID1;
148 static bool arg_ephemeral = false;
149 static LinkJournal arg_link_journal = LINK_AUTO;
150 static bool arg_link_journal_try = false;
151 static uint64_t arg_caps_retain =
152 (1ULL << CAP_AUDIT_CONTROL) |
153 (1ULL << CAP_AUDIT_WRITE) |
154 (1ULL << CAP_CHOWN) |
155 (1ULL << CAP_DAC_OVERRIDE) |
156 (1ULL << CAP_DAC_READ_SEARCH) |
157 (1ULL << CAP_FOWNER) |
158 (1ULL << CAP_FSETID) |
159 (1ULL << CAP_IPC_OWNER) |
160 (1ULL << CAP_KILL) |
161 (1ULL << CAP_LEASE) |
162 (1ULL << CAP_LINUX_IMMUTABLE) |
163 (1ULL << CAP_MKNOD) |
164 (1ULL << CAP_NET_BIND_SERVICE) |
165 (1ULL << CAP_NET_BROADCAST) |
166 (1ULL << CAP_NET_RAW) |
167 (1ULL << CAP_SETFCAP) |
168 (1ULL << CAP_SETGID) |
169 (1ULL << CAP_SETPCAP) |
170 (1ULL << CAP_SETUID) |
171 (1ULL << CAP_SYS_ADMIN) |
172 (1ULL << CAP_SYS_BOOT) |
173 (1ULL << CAP_SYS_CHROOT) |
174 (1ULL << CAP_SYS_NICE) |
175 (1ULL << CAP_SYS_PTRACE) |
176 (1ULL << CAP_SYS_RESOURCE) |
177 (1ULL << CAP_SYS_TTY_CONFIG);
178 static CustomMount *arg_custom_mounts = NULL;
179 static unsigned arg_n_custom_mounts = 0;
180 static char **arg_setenv = NULL;
181 static bool arg_quiet = false;
182 static bool arg_register = true;
183 static bool arg_keep_unit = false;
184 static char **arg_network_interfaces = NULL;
185 static char **arg_network_macvlan = NULL;
186 static char **arg_network_ipvlan = NULL;
187 static bool arg_network_veth = false;
188 static char **arg_network_veth_extra = NULL;
189 static char *arg_network_bridge = NULL;
190 static char *arg_network_zone = NULL;
191 static unsigned long arg_personality = PERSONALITY_INVALID;
192 static char *arg_image = NULL;
193 static VolatileMode arg_volatile_mode = VOLATILE_NO;
194 static ExposePort *arg_expose_ports = NULL;
195 static char **arg_property = NULL;
196 static UserNamespaceMode arg_userns_mode = USER_NAMESPACE_NO;
197 static uid_t arg_uid_shift = UID_INVALID, arg_uid_range = 0x10000U;
198 static bool arg_userns_chown = false;
199 static int arg_kill_signal = 0;
200 static CGroupUnified arg_unified_cgroup_hierarchy = CGROUP_UNIFIED_UNKNOWN;
201 static SettingsMask arg_settings_mask = 0;
202 static int arg_settings_trusted = -1;
203 static char **arg_parameters = NULL;
204 static const char *arg_container_service_name = "systemd-nspawn";
205 static bool arg_notify_ready = false;
206 static bool arg_use_cgns = true;
207 static unsigned long arg_clone_ns_flags = CLONE_NEWIPC|CLONE_NEWPID|CLONE_NEWUTS;
208 static MountSettingsMask arg_mount_settings = MOUNT_APPLY_APIVFS_RO;
209 static void *arg_root_hash = NULL;
210 static size_t arg_root_hash_size = 0;
211
212 static void help(void) {
213 printf("%s [OPTIONS...] [PATH] [ARGUMENTS...]\n\n"
214 "Spawn a minimal namespace container for debugging, testing and building.\n\n"
215 " -h --help Show this help\n"
216 " --version Print version string\n"
217 " -q --quiet Do not show status information\n"
218 " -D --directory=PATH Root directory for the container\n"
219 " --template=PATH Initialize root directory from template directory,\n"
220 " if missing\n"
221 " -x --ephemeral Run container with snapshot of root directory, and\n"
222 " remove it after exit\n"
223 " -i --image=PATH File system device or disk image for the container\n"
224 " --root-hash=HASH Specify verity root hash\n"
225 " -a --as-pid2 Maintain a stub init as PID1, invoke binary as PID2\n"
226 " -b --boot Boot up full system (i.e. invoke init)\n"
227 " --chdir=PATH Set working directory in the container\n"
228 " --pivot-root=PATH[:PATH]\n"
229 " Pivot root to given directory in the container\n"
230 " -u --user=USER Run the command under specified user or uid\n"
231 " -M --machine=NAME Set the machine name for the container\n"
232 " --uuid=UUID Set a specific machine UUID for the container\n"
233 " -S --slice=SLICE Place the container in the specified slice\n"
234 " --property=NAME=VALUE Set scope unit property\n"
235 " -U --private-users=pick Run within user namespace, autoselect UID/GID range\n"
236 " --private-users[=UIDBASE[:NUIDS]]\n"
237 " Similar, but with user configured UID/GID range\n"
238 " --private-users-chown Adjust OS tree ownership to private UID/GID range\n"
239 " --private-network Disable network in container\n"
240 " --network-interface=INTERFACE\n"
241 " Assign an existing network interface to the\n"
242 " container\n"
243 " --network-macvlan=INTERFACE\n"
244 " Create a macvlan network interface based on an\n"
245 " existing network interface to the container\n"
246 " --network-ipvlan=INTERFACE\n"
247 " Create a ipvlan network interface based on an\n"
248 " existing network interface to the container\n"
249 " -n --network-veth Add a virtual Ethernet connection between host\n"
250 " and container\n"
251 " --network-veth-extra=HOSTIF[:CONTAINERIF]\n"
252 " Add an additional virtual Ethernet link between\n"
253 " host and container\n"
254 " --network-bridge=INTERFACE\n"
255 " Add a virtual Ethernet connection to the container\n"
256 " and attach it to an existing bridge on the host\n"
257 " --network-zone=NAME Similar, but attach the new interface to an\n"
258 " an automatically managed bridge interface\n"
259 " -p --port=[PROTOCOL:]HOSTPORT[:CONTAINERPORT]\n"
260 " Expose a container IP port on the host\n"
261 " -Z --selinux-context=SECLABEL\n"
262 " Set the SELinux security context to be used by\n"
263 " processes in the container\n"
264 " -L --selinux-apifs-context=SECLABEL\n"
265 " Set the SELinux security context to be used by\n"
266 " API/tmpfs file systems in the container\n"
267 " --capability=CAP In addition to the default, retain specified\n"
268 " capability\n"
269 " --drop-capability=CAP Drop the specified capability from the default set\n"
270 " --kill-signal=SIGNAL Select signal to use for shutting down PID 1\n"
271 " --link-journal=MODE Link up guest journal, one of no, auto, guest, \n"
272 " host, try-guest, try-host\n"
273 " -j Equivalent to --link-journal=try-guest\n"
274 " --read-only Mount the root directory read-only\n"
275 " --bind=PATH[:PATH[:OPTIONS]]\n"
276 " Bind mount a file or directory from the host into\n"
277 " the container\n"
278 " --bind-ro=PATH[:PATH[:OPTIONS]\n"
279 " Similar, but creates a read-only bind mount\n"
280 " --tmpfs=PATH:[OPTIONS] Mount an empty tmpfs to the specified directory\n"
281 " --overlay=PATH[:PATH...]:PATH\n"
282 " Create an overlay mount from the host to \n"
283 " the container\n"
284 " --overlay-ro=PATH[:PATH...]:PATH\n"
285 " Similar, but creates a read-only overlay mount\n"
286 " -E --setenv=NAME=VALUE Pass an environment variable to PID 1\n"
287 " --register=BOOLEAN Register container as machine\n"
288 " --keep-unit Do not register a scope for the machine, reuse\n"
289 " the service unit nspawn is running in\n"
290 " --volatile[=MODE] Run the system in volatile mode\n"
291 " --settings=BOOLEAN Load additional settings from .nspawn file\n"
292 " --notify-ready=BOOLEAN Receive notifications from the child init process\n"
293 , program_invocation_short_name);
294 }
295
296 static int custom_mount_check_all(void) {
297 unsigned i;
298
299 for (i = 0; i < arg_n_custom_mounts; i++) {
300 CustomMount *m = &arg_custom_mounts[i];
301
302 if (path_equal(m->destination, "/") && arg_userns_mode != USER_NAMESPACE_NO) {
303
304 if (arg_userns_chown) {
305 log_error("--private-users-chown may not be combined with custom root mounts.");
306 return -EINVAL;
307 } else if (arg_uid_shift == UID_INVALID) {
308 log_error("--private-users with automatic UID shift may not be combined with custom root mounts.");
309 return -EINVAL;
310 }
311 }
312 }
313
314 return 0;
315 }
316
317 static int detect_unified_cgroup_hierarchy(const char *directory) {
318 const char *e;
319 int r;
320
321 /* Allow the user to control whether the unified hierarchy is used */
322 e = getenv("UNIFIED_CGROUP_HIERARCHY");
323 if (e) {
324 r = parse_boolean(e);
325 if (r < 0)
326 return log_error_errno(r, "Failed to parse $UNIFIED_CGROUP_HIERARCHY.");
327 if (r > 0)
328 arg_unified_cgroup_hierarchy = CGROUP_UNIFIED_ALL;
329 else
330 arg_unified_cgroup_hierarchy = CGROUP_UNIFIED_NONE;
331
332 return 0;
333 }
334
335 /* Otherwise inherit the default from the host system */
336 r = cg_all_unified();
337 if (r < 0)
338 return log_error_errno(r, "Failed to determine whether we are in all unified mode.");
339 if (r > 0) {
340 /* Unified cgroup hierarchy support was added in 230. Unfortunately the detection
341 * routine only detects 231, so we'll have a false negative here for 230. */
342 r = systemd_installation_has_version(directory, 230);
343 if (r < 0)
344 return log_error_errno(r, "Failed to determine systemd version in container: %m");
345 if (r > 0)
346 arg_unified_cgroup_hierarchy = CGROUP_UNIFIED_ALL;
347 else
348 arg_unified_cgroup_hierarchy = CGROUP_UNIFIED_NONE;
349 } else if (cg_unified_controller(SYSTEMD_CGROUP_CONTROLLER) > 0) {
350 /* Mixed cgroup hierarchy support was added in 233 */
351 r = systemd_installation_has_version(directory, 233);
352 if (r < 0)
353 return log_error_errno(r, "Failed to determine systemd version in container: %m");
354 if (r > 0)
355 arg_unified_cgroup_hierarchy = CGROUP_UNIFIED_SYSTEMD;
356 else
357 arg_unified_cgroup_hierarchy = CGROUP_UNIFIED_NONE;
358 } else
359 arg_unified_cgroup_hierarchy = CGROUP_UNIFIED_NONE;
360
361 return 0;
362 }
363
364 static void parse_share_ns_env(const char *name, unsigned long ns_flag) {
365 int r;
366
367 r = getenv_bool(name);
368 if (r == -ENXIO)
369 return;
370 if (r < 0)
371 log_warning_errno(r, "Failed to parse %s from environment, defaulting to false.", name);
372 arg_clone_ns_flags = (arg_clone_ns_flags & ~ns_flag) | (r > 0 ? 0 : ns_flag);
373 }
374
375 static void parse_mount_settings_env(void) {
376 int r;
377 const char *e;
378
379 e = getenv("SYSTEMD_NSPAWN_API_VFS_WRITABLE");
380 if (!e)
381 return;
382
383 if (streq(e, "network")) {
384 arg_mount_settings |= MOUNT_APPLY_APIVFS_RO|MOUNT_APPLY_APIVFS_NETNS;
385 return;
386 }
387
388 r = parse_boolean(e);
389 if (r < 0) {
390 log_warning_errno(r, "Failed to parse SYSTEMD_NSPAWN_API_VFS_WRITABLE from environment, ignoring.");
391 return;
392 } else if (r > 0)
393 arg_mount_settings &= ~MOUNT_APPLY_APIVFS_RO;
394 else
395 arg_mount_settings |= MOUNT_APPLY_APIVFS_RO;
396
397 arg_mount_settings &= ~MOUNT_APPLY_APIVFS_NETNS;
398 }
399
400 static int parse_argv(int argc, char *argv[]) {
401
402 enum {
403 ARG_VERSION = 0x100,
404 ARG_PRIVATE_NETWORK,
405 ARG_UUID,
406 ARG_READ_ONLY,
407 ARG_CAPABILITY,
408 ARG_DROP_CAPABILITY,
409 ARG_LINK_JOURNAL,
410 ARG_BIND,
411 ARG_BIND_RO,
412 ARG_TMPFS,
413 ARG_OVERLAY,
414 ARG_OVERLAY_RO,
415 ARG_SHARE_SYSTEM,
416 ARG_REGISTER,
417 ARG_KEEP_UNIT,
418 ARG_NETWORK_INTERFACE,
419 ARG_NETWORK_MACVLAN,
420 ARG_NETWORK_IPVLAN,
421 ARG_NETWORK_BRIDGE,
422 ARG_NETWORK_ZONE,
423 ARG_NETWORK_VETH_EXTRA,
424 ARG_PERSONALITY,
425 ARG_VOLATILE,
426 ARG_TEMPLATE,
427 ARG_PROPERTY,
428 ARG_PRIVATE_USERS,
429 ARG_KILL_SIGNAL,
430 ARG_SETTINGS,
431 ARG_CHDIR,
432 ARG_PIVOT_ROOT,
433 ARG_PRIVATE_USERS_CHOWN,
434 ARG_NOTIFY_READY,
435 ARG_ROOT_HASH,
436 };
437
438 static const struct option options[] = {
439 { "help", no_argument, NULL, 'h' },
440 { "version", no_argument, NULL, ARG_VERSION },
441 { "directory", required_argument, NULL, 'D' },
442 { "template", required_argument, NULL, ARG_TEMPLATE },
443 { "ephemeral", no_argument, NULL, 'x' },
444 { "user", required_argument, NULL, 'u' },
445 { "private-network", no_argument, NULL, ARG_PRIVATE_NETWORK },
446 { "as-pid2", no_argument, NULL, 'a' },
447 { "boot", no_argument, NULL, 'b' },
448 { "uuid", required_argument, NULL, ARG_UUID },
449 { "read-only", no_argument, NULL, ARG_READ_ONLY },
450 { "capability", required_argument, NULL, ARG_CAPABILITY },
451 { "drop-capability", required_argument, NULL, ARG_DROP_CAPABILITY },
452 { "link-journal", required_argument, NULL, ARG_LINK_JOURNAL },
453 { "bind", required_argument, NULL, ARG_BIND },
454 { "bind-ro", required_argument, NULL, ARG_BIND_RO },
455 { "tmpfs", required_argument, NULL, ARG_TMPFS },
456 { "overlay", required_argument, NULL, ARG_OVERLAY },
457 { "overlay-ro", required_argument, NULL, ARG_OVERLAY_RO },
458 { "machine", required_argument, NULL, 'M' },
459 { "slice", required_argument, NULL, 'S' },
460 { "setenv", required_argument, NULL, 'E' },
461 { "selinux-context", required_argument, NULL, 'Z' },
462 { "selinux-apifs-context", required_argument, NULL, 'L' },
463 { "quiet", no_argument, NULL, 'q' },
464 { "share-system", no_argument, NULL, ARG_SHARE_SYSTEM }, /* not documented */
465 { "register", required_argument, NULL, ARG_REGISTER },
466 { "keep-unit", no_argument, NULL, ARG_KEEP_UNIT },
467 { "network-interface", required_argument, NULL, ARG_NETWORK_INTERFACE },
468 { "network-macvlan", required_argument, NULL, ARG_NETWORK_MACVLAN },
469 { "network-ipvlan", required_argument, NULL, ARG_NETWORK_IPVLAN },
470 { "network-veth", no_argument, NULL, 'n' },
471 { "network-veth-extra", required_argument, NULL, ARG_NETWORK_VETH_EXTRA },
472 { "network-bridge", required_argument, NULL, ARG_NETWORK_BRIDGE },
473 { "network-zone", required_argument, NULL, ARG_NETWORK_ZONE },
474 { "personality", required_argument, NULL, ARG_PERSONALITY },
475 { "image", required_argument, NULL, 'i' },
476 { "volatile", optional_argument, NULL, ARG_VOLATILE },
477 { "port", required_argument, NULL, 'p' },
478 { "property", required_argument, NULL, ARG_PROPERTY },
479 { "private-users", optional_argument, NULL, ARG_PRIVATE_USERS },
480 { "private-users-chown", optional_argument, NULL, ARG_PRIVATE_USERS_CHOWN },
481 { "kill-signal", required_argument, NULL, ARG_KILL_SIGNAL },
482 { "settings", required_argument, NULL, ARG_SETTINGS },
483 { "chdir", required_argument, NULL, ARG_CHDIR },
484 { "pivot-root", required_argument, NULL, ARG_PIVOT_ROOT },
485 { "notify-ready", required_argument, NULL, ARG_NOTIFY_READY },
486 { "root-hash", required_argument, NULL, ARG_ROOT_HASH },
487 {}
488 };
489
490 int c, r;
491 const char *p, *e;
492 uint64_t plus = 0, minus = 0;
493 bool mask_all_settings = false, mask_no_settings = false;
494
495 assert(argc >= 0);
496 assert(argv);
497
498 while ((c = getopt_long(argc, argv, "+hD:u:abL:M:jS:Z:qi:xp:nUE:", options, NULL)) >= 0)
499
500 switch (c) {
501
502 case 'h':
503 help();
504 return 0;
505
506 case ARG_VERSION:
507 return version();
508
509 case 'D':
510 r = parse_path_argument_and_warn(optarg, false, &arg_directory);
511 if (r < 0)
512 return r;
513 break;
514
515 case ARG_TEMPLATE:
516 r = parse_path_argument_and_warn(optarg, false, &arg_template);
517 if (r < 0)
518 return r;
519 break;
520
521 case 'i':
522 r = parse_path_argument_and_warn(optarg, false, &arg_image);
523 if (r < 0)
524 return r;
525 break;
526
527 case 'x':
528 arg_ephemeral = true;
529 break;
530
531 case 'u':
532 r = free_and_strdup(&arg_user, optarg);
533 if (r < 0)
534 return log_oom();
535
536 arg_settings_mask |= SETTING_USER;
537 break;
538
539 case ARG_NETWORK_ZONE: {
540 char *j;
541
542 j = strappend("vz-", optarg);
543 if (!j)
544 return log_oom();
545
546 if (!ifname_valid(j)) {
547 log_error("Network zone name not valid: %s", j);
548 free(j);
549 return -EINVAL;
550 }
551
552 free(arg_network_zone);
553 arg_network_zone = j;
554
555 arg_network_veth = true;
556 arg_private_network = true;
557 arg_settings_mask |= SETTING_NETWORK;
558 break;
559 }
560
561 case ARG_NETWORK_BRIDGE:
562
563 if (!ifname_valid(optarg)) {
564 log_error("Bridge interface name not valid: %s", optarg);
565 return -EINVAL;
566 }
567
568 r = free_and_strdup(&arg_network_bridge, optarg);
569 if (r < 0)
570 return log_oom();
571
572 /* fall through */
573
574 case 'n':
575 arg_network_veth = true;
576 arg_private_network = true;
577 arg_settings_mask |= SETTING_NETWORK;
578 break;
579
580 case ARG_NETWORK_VETH_EXTRA:
581 r = veth_extra_parse(&arg_network_veth_extra, optarg);
582 if (r < 0)
583 return log_error_errno(r, "Failed to parse --network-veth-extra= parameter: %s", optarg);
584
585 arg_private_network = true;
586 arg_settings_mask |= SETTING_NETWORK;
587 break;
588
589 case ARG_NETWORK_INTERFACE:
590
591 if (!ifname_valid(optarg)) {
592 log_error("Network interface name not valid: %s", optarg);
593 return -EINVAL;
594 }
595
596 if (strv_extend(&arg_network_interfaces, optarg) < 0)
597 return log_oom();
598
599 arg_private_network = true;
600 arg_settings_mask |= SETTING_NETWORK;
601 break;
602
603 case ARG_NETWORK_MACVLAN:
604
605 if (!ifname_valid(optarg)) {
606 log_error("MACVLAN network interface name not valid: %s", optarg);
607 return -EINVAL;
608 }
609
610 if (strv_extend(&arg_network_macvlan, optarg) < 0)
611 return log_oom();
612
613 arg_private_network = true;
614 arg_settings_mask |= SETTING_NETWORK;
615 break;
616
617 case ARG_NETWORK_IPVLAN:
618
619 if (!ifname_valid(optarg)) {
620 log_error("IPVLAN network interface name not valid: %s", optarg);
621 return -EINVAL;
622 }
623
624 if (strv_extend(&arg_network_ipvlan, optarg) < 0)
625 return log_oom();
626
627 /* fall through */
628
629 case ARG_PRIVATE_NETWORK:
630 arg_private_network = true;
631 arg_settings_mask |= SETTING_NETWORK;
632 break;
633
634 case 'b':
635 if (arg_start_mode == START_PID2) {
636 log_error("--boot and --as-pid2 may not be combined.");
637 return -EINVAL;
638 }
639
640 arg_start_mode = START_BOOT;
641 arg_settings_mask |= SETTING_START_MODE;
642 break;
643
644 case 'a':
645 if (arg_start_mode == START_BOOT) {
646 log_error("--boot and --as-pid2 may not be combined.");
647 return -EINVAL;
648 }
649
650 arg_start_mode = START_PID2;
651 arg_settings_mask |= SETTING_START_MODE;
652 break;
653
654 case ARG_UUID:
655 r = sd_id128_from_string(optarg, &arg_uuid);
656 if (r < 0)
657 return log_error_errno(r, "Invalid UUID: %s", optarg);
658
659 if (sd_id128_is_null(arg_uuid)) {
660 log_error("Machine UUID may not be all zeroes.");
661 return -EINVAL;
662 }
663
664 arg_settings_mask |= SETTING_MACHINE_ID;
665 break;
666
667 case 'S':
668 arg_slice = optarg;
669 break;
670
671 case 'M':
672 if (isempty(optarg))
673 arg_machine = mfree(arg_machine);
674 else {
675 if (!machine_name_is_valid(optarg)) {
676 log_error("Invalid machine name: %s", optarg);
677 return -EINVAL;
678 }
679
680 r = free_and_strdup(&arg_machine, optarg);
681 if (r < 0)
682 return log_oom();
683 }
684 break;
685
686 case 'Z':
687 arg_selinux_context = optarg;
688 break;
689
690 case 'L':
691 arg_selinux_apifs_context = optarg;
692 break;
693
694 case ARG_READ_ONLY:
695 arg_read_only = true;
696 arg_settings_mask |= SETTING_READ_ONLY;
697 break;
698
699 case ARG_CAPABILITY:
700 case ARG_DROP_CAPABILITY: {
701 p = optarg;
702 for (;;) {
703 _cleanup_free_ char *t = NULL;
704
705 r = extract_first_word(&p, &t, ",", 0);
706 if (r < 0)
707 return log_error_errno(r, "Failed to parse capability %s.", t);
708
709 if (r == 0)
710 break;
711
712 if (streq(t, "all")) {
713 if (c == ARG_CAPABILITY)
714 plus = (uint64_t) -1;
715 else
716 minus = (uint64_t) -1;
717 } else {
718 int cap;
719
720 cap = capability_from_name(t);
721 if (cap < 0) {
722 log_error("Failed to parse capability %s.", t);
723 return -EINVAL;
724 }
725
726 if (c == ARG_CAPABILITY)
727 plus |= 1ULL << (uint64_t) cap;
728 else
729 minus |= 1ULL << (uint64_t) cap;
730 }
731 }
732
733 arg_settings_mask |= SETTING_CAPABILITY;
734 break;
735 }
736
737 case 'j':
738 arg_link_journal = LINK_GUEST;
739 arg_link_journal_try = true;
740 break;
741
742 case ARG_LINK_JOURNAL:
743 if (streq(optarg, "auto")) {
744 arg_link_journal = LINK_AUTO;
745 arg_link_journal_try = false;
746 } else if (streq(optarg, "no")) {
747 arg_link_journal = LINK_NO;
748 arg_link_journal_try = false;
749 } else if (streq(optarg, "guest")) {
750 arg_link_journal = LINK_GUEST;
751 arg_link_journal_try = false;
752 } else if (streq(optarg, "host")) {
753 arg_link_journal = LINK_HOST;
754 arg_link_journal_try = false;
755 } else if (streq(optarg, "try-guest")) {
756 arg_link_journal = LINK_GUEST;
757 arg_link_journal_try = true;
758 } else if (streq(optarg, "try-host")) {
759 arg_link_journal = LINK_HOST;
760 arg_link_journal_try = true;
761 } else {
762 log_error("Failed to parse link journal mode %s", optarg);
763 return -EINVAL;
764 }
765
766 break;
767
768 case ARG_BIND:
769 case ARG_BIND_RO:
770 r = bind_mount_parse(&arg_custom_mounts, &arg_n_custom_mounts, optarg, c == ARG_BIND_RO);
771 if (r < 0)
772 return log_error_errno(r, "Failed to parse --bind(-ro)= argument %s: %m", optarg);
773
774 arg_settings_mask |= SETTING_CUSTOM_MOUNTS;
775 break;
776
777 case ARG_TMPFS:
778 r = tmpfs_mount_parse(&arg_custom_mounts, &arg_n_custom_mounts, optarg);
779 if (r < 0)
780 return log_error_errno(r, "Failed to parse --tmpfs= argument %s: %m", optarg);
781
782 arg_settings_mask |= SETTING_CUSTOM_MOUNTS;
783 break;
784
785 case ARG_OVERLAY:
786 case ARG_OVERLAY_RO:
787 r = overlay_mount_parse(&arg_custom_mounts, &arg_n_custom_mounts, optarg, c == ARG_OVERLAY_RO);
788 if (r == -EADDRNOTAVAIL)
789 return log_error_errno(r, "--overlay(-ro)= needs at least two colon-separated directories specified.");
790 if (r < 0)
791 return log_error_errno(r, "Failed to parse --overlay(-ro)= argument %s: %m", optarg);
792
793 arg_settings_mask |= SETTING_CUSTOM_MOUNTS;
794 break;
795
796 case 'E': {
797 char **n;
798
799 if (!env_assignment_is_valid(optarg)) {
800 log_error("Environment variable assignment '%s' is not valid.", optarg);
801 return -EINVAL;
802 }
803
804 n = strv_env_set(arg_setenv, optarg);
805 if (!n)
806 return log_oom();
807
808 strv_free(arg_setenv);
809 arg_setenv = n;
810
811 arg_settings_mask |= SETTING_ENVIRONMENT;
812 break;
813 }
814
815 case 'q':
816 arg_quiet = true;
817 break;
818
819 case ARG_SHARE_SYSTEM:
820 /* We don't officially support this anymore, except for compat reasons. People should use the
821 * $SYSTEMD_NSPAWN_SHARE_* environment variables instead. */
822 arg_clone_ns_flags = 0;
823 break;
824
825 case ARG_REGISTER:
826 r = parse_boolean(optarg);
827 if (r < 0) {
828 log_error("Failed to parse --register= argument: %s", optarg);
829 return r;
830 }
831
832 arg_register = r;
833 break;
834
835 case ARG_KEEP_UNIT:
836 arg_keep_unit = true;
837 break;
838
839 case ARG_PERSONALITY:
840
841 arg_personality = personality_from_string(optarg);
842 if (arg_personality == PERSONALITY_INVALID) {
843 log_error("Unknown or unsupported personality '%s'.", optarg);
844 return -EINVAL;
845 }
846
847 arg_settings_mask |= SETTING_PERSONALITY;
848 break;
849
850 case ARG_VOLATILE:
851
852 if (!optarg)
853 arg_volatile_mode = VOLATILE_YES;
854 else {
855 VolatileMode m;
856
857 m = volatile_mode_from_string(optarg);
858 if (m < 0) {
859 log_error("Failed to parse --volatile= argument: %s", optarg);
860 return -EINVAL;
861 } else
862 arg_volatile_mode = m;
863 }
864
865 arg_settings_mask |= SETTING_VOLATILE_MODE;
866 break;
867
868 case 'p':
869 r = expose_port_parse(&arg_expose_ports, optarg);
870 if (r == -EEXIST)
871 return log_error_errno(r, "Duplicate port specification: %s", optarg);
872 if (r < 0)
873 return log_error_errno(r, "Failed to parse host port %s: %m", optarg);
874
875 arg_settings_mask |= SETTING_EXPOSE_PORTS;
876 break;
877
878 case ARG_PROPERTY:
879 if (strv_extend(&arg_property, optarg) < 0)
880 return log_oom();
881
882 break;
883
884 case ARG_PRIVATE_USERS: {
885 int boolean = -1;
886
887 if (!optarg)
888 boolean = true;
889 else if (!in_charset(optarg, DIGITS))
890 /* do *not* parse numbers as booleans */
891 boolean = parse_boolean(optarg);
892
893 if (boolean == false) {
894 /* no: User namespacing off */
895 arg_userns_mode = USER_NAMESPACE_NO;
896 arg_uid_shift = UID_INVALID;
897 arg_uid_range = UINT32_C(0x10000);
898 } else if (boolean == true) {
899 /* yes: User namespacing on, UID range is read from root dir */
900 arg_userns_mode = USER_NAMESPACE_FIXED;
901 arg_uid_shift = UID_INVALID;
902 arg_uid_range = UINT32_C(0x10000);
903 } else if (streq(optarg, "pick")) {
904 /* pick: User namespacing on, UID range is picked randomly */
905 arg_userns_mode = USER_NAMESPACE_PICK;
906 arg_uid_shift = UID_INVALID;
907 arg_uid_range = UINT32_C(0x10000);
908 } else {
909 _cleanup_free_ char *buffer = NULL;
910 const char *range, *shift;
911
912 /* anything else: User namespacing on, UID range is explicitly configured */
913
914 range = strchr(optarg, ':');
915 if (range) {
916 buffer = strndup(optarg, range - optarg);
917 if (!buffer)
918 return log_oom();
919 shift = buffer;
920
921 range++;
922 r = safe_atou32(range, &arg_uid_range);
923 if (r < 0)
924 return log_error_errno(r, "Failed to parse UID range \"%s\": %m", range);
925 } else
926 shift = optarg;
927
928 r = parse_uid(shift, &arg_uid_shift);
929 if (r < 0)
930 return log_error_errno(r, "Failed to parse UID \"%s\": %m", optarg);
931
932 arg_userns_mode = USER_NAMESPACE_FIXED;
933 }
934
935 if (arg_uid_range <= 0) {
936 log_error("UID range cannot be 0.");
937 return -EINVAL;
938 }
939
940 arg_settings_mask |= SETTING_USERNS;
941 break;
942 }
943
944 case 'U':
945 if (userns_supported()) {
946 arg_userns_mode = USER_NAMESPACE_PICK;
947 arg_uid_shift = UID_INVALID;
948 arg_uid_range = UINT32_C(0x10000);
949
950 arg_settings_mask |= SETTING_USERNS;
951 }
952
953 break;
954
955 case ARG_PRIVATE_USERS_CHOWN:
956 arg_userns_chown = true;
957
958 arg_settings_mask |= SETTING_USERNS;
959 break;
960
961 case ARG_KILL_SIGNAL:
962 arg_kill_signal = signal_from_string_try_harder(optarg);
963 if (arg_kill_signal < 0) {
964 log_error("Cannot parse signal: %s", optarg);
965 return -EINVAL;
966 }
967
968 arg_settings_mask |= SETTING_KILL_SIGNAL;
969 break;
970
971 case ARG_SETTINGS:
972
973 /* no → do not read files
974 * yes → read files, do not override cmdline, trust only subset
975 * override → read files, override cmdline, trust only subset
976 * trusted → read files, do not override cmdline, trust all
977 */
978
979 r = parse_boolean(optarg);
980 if (r < 0) {
981 if (streq(optarg, "trusted")) {
982 mask_all_settings = false;
983 mask_no_settings = false;
984 arg_settings_trusted = true;
985
986 } else if (streq(optarg, "override")) {
987 mask_all_settings = false;
988 mask_no_settings = true;
989 arg_settings_trusted = -1;
990 } else
991 return log_error_errno(r, "Failed to parse --settings= argument: %s", optarg);
992 } else if (r > 0) {
993 /* yes */
994 mask_all_settings = false;
995 mask_no_settings = false;
996 arg_settings_trusted = -1;
997 } else {
998 /* no */
999 mask_all_settings = true;
1000 mask_no_settings = false;
1001 arg_settings_trusted = false;
1002 }
1003
1004 break;
1005
1006 case ARG_CHDIR:
1007 if (!path_is_absolute(optarg)) {
1008 log_error("Working directory %s is not an absolute path.", optarg);
1009 return -EINVAL;
1010 }
1011
1012 r = free_and_strdup(&arg_chdir, optarg);
1013 if (r < 0)
1014 return log_oom();
1015
1016 arg_settings_mask |= SETTING_WORKING_DIRECTORY;
1017 break;
1018
1019 case ARG_PIVOT_ROOT:
1020 r = pivot_root_parse(&arg_pivot_root_new, &arg_pivot_root_old, optarg);
1021 if (r < 0)
1022 return log_error_errno(r, "Failed to parse --pivot-root= argument %s: %m", optarg);
1023
1024 arg_settings_mask |= SETTING_PIVOT_ROOT;
1025 break;
1026
1027 case ARG_NOTIFY_READY:
1028 r = parse_boolean(optarg);
1029 if (r < 0) {
1030 log_error("%s is not a valid notify mode. Valid modes are: yes, no, and ready.", optarg);
1031 return -EINVAL;
1032 }
1033 arg_notify_ready = r;
1034 arg_settings_mask |= SETTING_NOTIFY_READY;
1035 break;
1036
1037 case ARG_ROOT_HASH: {
1038 void *k;
1039 size_t l;
1040
1041 r = unhexmem(optarg, strlen(optarg), &k, &l);
1042 if (r < 0)
1043 return log_error_errno(r, "Failed to parse root hash: %s", optarg);
1044 if (l < sizeof(sd_id128_t)) {
1045 log_error("Root hash must be at least 128bit long: %s", optarg);
1046 free(k);
1047 return -EINVAL;
1048 }
1049
1050 free(arg_root_hash);
1051 arg_root_hash = k;
1052 arg_root_hash_size = l;
1053 break;
1054 }
1055
1056 case '?':
1057 return -EINVAL;
1058
1059 default:
1060 assert_not_reached("Unhandled option");
1061 }
1062
1063 parse_share_ns_env("SYSTEMD_NSPAWN_SHARE_NS_IPC", CLONE_NEWIPC);
1064 parse_share_ns_env("SYSTEMD_NSPAWN_SHARE_NS_PID", CLONE_NEWPID);
1065 parse_share_ns_env("SYSTEMD_NSPAWN_SHARE_NS_UTS", CLONE_NEWUTS);
1066 parse_share_ns_env("SYSTEMD_NSPAWN_SHARE_SYSTEM", CLONE_NEWIPC|CLONE_NEWPID|CLONE_NEWUTS);
1067
1068 if (arg_userns_mode != USER_NAMESPACE_NO)
1069 arg_mount_settings |= MOUNT_USE_USERNS;
1070
1071 if (arg_private_network)
1072 arg_mount_settings |= MOUNT_APPLY_APIVFS_NETNS;
1073
1074 parse_mount_settings_env();
1075
1076 if (!(arg_clone_ns_flags & CLONE_NEWPID) ||
1077 !(arg_clone_ns_flags & CLONE_NEWUTS)) {
1078 arg_register = false;
1079 if (arg_start_mode != START_PID1) {
1080 log_error("--boot cannot be used without namespacing.");
1081 return -EINVAL;
1082 }
1083 }
1084
1085 if (arg_userns_mode == USER_NAMESPACE_PICK)
1086 arg_userns_chown = true;
1087
1088 if (arg_keep_unit && cg_pid_get_owner_uid(0, NULL) >= 0) {
1089 log_error("--keep-unit may not be used when invoked from a user session.");
1090 return -EINVAL;
1091 }
1092
1093 if (arg_directory && arg_image) {
1094 log_error("--directory= and --image= may not be combined.");
1095 return -EINVAL;
1096 }
1097
1098 if (arg_template && arg_image) {
1099 log_error("--template= and --image= may not be combined.");
1100 return -EINVAL;
1101 }
1102
1103 if (arg_ephemeral && arg_template && !arg_directory) {
1104 /* User asked for ephemeral execution but specified --template= instead of --directory=. Semantically
1105 * such an invocation makes some sense, see https://github.com/systemd/systemd/issues/3667. Let's
1106 * accept this here, and silently make "--ephemeral --template=" equivalent to "--ephemeral
1107 * --directory=". */
1108
1109 arg_directory = arg_template;
1110 arg_template = NULL;
1111 }
1112
1113 if (arg_template && !(arg_directory || arg_machine)) {
1114 log_error("--template= needs --directory= or --machine=.");
1115 return -EINVAL;
1116 }
1117
1118 if (arg_ephemeral && arg_template) {
1119 log_error("--ephemeral and --template= may not be combined.");
1120 return -EINVAL;
1121 }
1122
1123 if (arg_ephemeral && !IN_SET(arg_link_journal, LINK_NO, LINK_AUTO)) {
1124 log_error("--ephemeral and --link-journal= may not be combined.");
1125 return -EINVAL;
1126 }
1127
1128 if (arg_userns_mode != USER_NAMESPACE_NO && !userns_supported()) {
1129 log_error("--private-users= is not supported, kernel compiled without user namespace support.");
1130 return -EOPNOTSUPP;
1131 }
1132
1133 if (arg_userns_chown && arg_read_only) {
1134 log_error("--read-only and --private-users-chown may not be combined.");
1135 return -EINVAL;
1136 }
1137
1138 if (arg_network_bridge && arg_network_zone) {
1139 log_error("--network-bridge= and --network-zone= may not be combined.");
1140 return -EINVAL;
1141 }
1142
1143 if (argc > optind) {
1144 arg_parameters = strv_copy(argv + optind);
1145 if (!arg_parameters)
1146 return log_oom();
1147
1148 arg_settings_mask |= SETTING_START_MODE;
1149 }
1150
1151 /* Load all settings from .nspawn files */
1152 if (mask_no_settings)
1153 arg_settings_mask = 0;
1154
1155 /* Don't load any settings from .nspawn files */
1156 if (mask_all_settings)
1157 arg_settings_mask = _SETTINGS_MASK_ALL;
1158
1159 arg_caps_retain = (arg_caps_retain | plus | (arg_private_network ? 1ULL << CAP_NET_ADMIN : 0)) & ~minus;
1160
1161 r = cg_unified_flush();
1162 if (r < 0)
1163 return log_error_errno(r, "Failed to determine whether the unified cgroups hierarchy is used: %m");
1164
1165 e = getenv("SYSTEMD_NSPAWN_CONTAINER_SERVICE");
1166 if (e)
1167 arg_container_service_name = e;
1168
1169 r = getenv_bool("SYSTEMD_NSPAWN_USE_CGNS");
1170 if (r < 0)
1171 arg_use_cgns = cg_ns_supported();
1172 else
1173 arg_use_cgns = r;
1174
1175 r = custom_mount_check_all();
1176 if (r < 0)
1177 return r;
1178
1179 return 1;
1180 }
1181
1182 static int verify_arguments(void) {
1183 if (arg_userns_mode != USER_NAMESPACE_NO && (arg_mount_settings & MOUNT_APPLY_APIVFS_NETNS) && !arg_private_network) {
1184 log_error("Invalid namespacing settings. Mounting sysfs with --private-users requires --private-network.");
1185 return -EINVAL;
1186 }
1187
1188 if (arg_userns_mode != USER_NAMESPACE_NO && !(arg_mount_settings & MOUNT_APPLY_APIVFS_RO)) {
1189 log_error("Cannot combine --private-users with read-write mounts.");
1190 return -EINVAL;
1191 }
1192
1193 if (arg_volatile_mode != VOLATILE_NO && arg_read_only) {
1194 log_error("Cannot combine --read-only with --volatile. Note that --volatile already implies a read-only base hierarchy.");
1195 return -EINVAL;
1196 }
1197
1198 if (arg_expose_ports && !arg_private_network) {
1199 log_error("Cannot use --port= without private networking.");
1200 return -EINVAL;
1201 }
1202
1203 #ifndef HAVE_LIBIPTC
1204 if (arg_expose_ports) {
1205 log_error("--port= is not supported, compiled without libiptc support.");
1206 return -EOPNOTSUPP;
1207 }
1208 #endif
1209
1210 if (arg_start_mode == START_BOOT && arg_kill_signal <= 0)
1211 arg_kill_signal = SIGRTMIN+3;
1212
1213 return 0;
1214 }
1215
1216 static int userns_lchown(const char *p, uid_t uid, gid_t gid) {
1217 assert(p);
1218
1219 if (arg_userns_mode == USER_NAMESPACE_NO)
1220 return 0;
1221
1222 if (uid == UID_INVALID && gid == GID_INVALID)
1223 return 0;
1224
1225 if (uid != UID_INVALID) {
1226 uid += arg_uid_shift;
1227
1228 if (uid < arg_uid_shift || uid >= arg_uid_shift + arg_uid_range)
1229 return -EOVERFLOW;
1230 }
1231
1232 if (gid != GID_INVALID) {
1233 gid += (gid_t) arg_uid_shift;
1234
1235 if (gid < (gid_t) arg_uid_shift || gid >= (gid_t) (arg_uid_shift + arg_uid_range))
1236 return -EOVERFLOW;
1237 }
1238
1239 if (lchown(p, uid, gid) < 0)
1240 return -errno;
1241
1242 return 0;
1243 }
1244
1245 static int userns_mkdir(const char *root, const char *path, mode_t mode, uid_t uid, gid_t gid) {
1246 const char *q;
1247
1248 q = prefix_roota(root, path);
1249 if (mkdir(q, mode) < 0) {
1250 if (errno == EEXIST)
1251 return 0;
1252 return -errno;
1253 }
1254
1255 return userns_lchown(q, uid, gid);
1256 }
1257
1258 static int setup_timezone(const char *dest) {
1259 _cleanup_free_ char *p = NULL, *q = NULL;
1260 const char *where, *check, *what;
1261 char *z, *y;
1262 int r;
1263
1264 assert(dest);
1265
1266 /* Fix the timezone, if possible */
1267 r = readlink_malloc("/etc/localtime", &p);
1268 if (r < 0) {
1269 log_warning("host's /etc/localtime is not a symlink, not updating container timezone.");
1270 /* to handle warning, delete /etc/localtime and replace it
1271 * with a symbolic link to a time zone data file.
1272 *
1273 * Example:
1274 * ln -s /usr/share/zoneinfo/UTC /etc/localtime
1275 */
1276 return 0;
1277 }
1278
1279 z = path_startswith(p, "../usr/share/zoneinfo/");
1280 if (!z)
1281 z = path_startswith(p, "/usr/share/zoneinfo/");
1282 if (!z) {
1283 log_warning("/etc/localtime does not point into /usr/share/zoneinfo/, not updating container timezone.");
1284 return 0;
1285 }
1286
1287 where = prefix_roota(dest, "/etc/localtime");
1288 r = readlink_malloc(where, &q);
1289 if (r >= 0) {
1290 y = path_startswith(q, "../usr/share/zoneinfo/");
1291 if (!y)
1292 y = path_startswith(q, "/usr/share/zoneinfo/");
1293
1294 /* Already pointing to the right place? Then do nothing .. */
1295 if (y && streq(y, z))
1296 return 0;
1297 }
1298
1299 check = strjoina("/usr/share/zoneinfo/", z);
1300 check = prefix_roota(dest, check);
1301 if (laccess(check, F_OK) < 0) {
1302 log_warning("Timezone %s does not exist in container, not updating container timezone.", z);
1303 return 0;
1304 }
1305
1306 if (unlink(where) < 0 && errno != ENOENT) {
1307 log_full_errno(IN_SET(errno, EROFS, EACCES, EPERM) ? LOG_DEBUG : LOG_WARNING, /* Don't complain on read-only images */
1308 errno,
1309 "Failed to remove existing timezone info %s in container, ignoring: %m", where);
1310 return 0;
1311 }
1312
1313 what = strjoina("../usr/share/zoneinfo/", z);
1314 if (symlink(what, where) < 0) {
1315 log_full_errno(IN_SET(errno, EROFS, EACCES, EPERM) ? LOG_DEBUG : LOG_WARNING,
1316 errno,
1317 "Failed to correct timezone of container, ignoring: %m");
1318 return 0;
1319 }
1320
1321 r = userns_lchown(where, 0, 0);
1322 if (r < 0)
1323 return log_warning_errno(r, "Failed to chown /etc/localtime: %m");
1324
1325 return 0;
1326 }
1327
1328 static int resolved_listening(void) {
1329 _cleanup_(sd_bus_flush_close_unrefp) sd_bus *bus = NULL;
1330 _cleanup_free_ char *dns_stub_listener_mode = NULL;
1331 int r;
1332
1333 /* Check if resolved is listening */
1334
1335 r = sd_bus_open_system(&bus);
1336 if (r < 0)
1337 return r;
1338
1339 r = bus_name_has_owner(bus, "org.freedesktop.resolve1", NULL);
1340 if (r <= 0)
1341 return r;
1342
1343 r = sd_bus_get_property_string(bus,
1344 "org.freedesktop.resolve1",
1345 "/org/freedesktop/resolve1",
1346 "org.freedesktop.resolve1.Manager",
1347 "DNSStubListener",
1348 NULL,
1349 &dns_stub_listener_mode);
1350 if (r < 0)
1351 return r;
1352
1353 return STR_IN_SET(dns_stub_listener_mode, "udp", "yes");
1354 }
1355
1356 static int setup_resolv_conf(const char *dest) {
1357 _cleanup_free_ char *resolved = NULL, *etc = NULL;
1358 const char *where;
1359 int r, found;
1360
1361 assert(dest);
1362
1363 if (arg_private_network)
1364 return 0;
1365
1366 r = chase_symlinks("/etc", dest, CHASE_PREFIX_ROOT, &etc);
1367 if (r < 0) {
1368 log_warning_errno(r, "Failed to resolve /etc path in container, ignoring: %m");
1369 return 0;
1370 }
1371
1372 where = strjoina(etc, "/resolv.conf");
1373 found = chase_symlinks(where, dest, CHASE_NONEXISTENT, &resolved);
1374 if (found < 0) {
1375 log_warning_errno(found, "Failed to resolve /etc/resolv.conf path in container, ignoring: %m");
1376 return 0;
1377 }
1378
1379 if (access("/usr/lib/systemd/resolv.conf", F_OK) >= 0 &&
1380 resolved_listening() > 0) {
1381
1382 /* resolved is enabled on the host. In this, case bind mount its static resolv.conf file into the
1383 * container, so that the container can use the host's resolver. Given that network namespacing is
1384 * disabled it's only natural of the container also uses the host's resolver. It also has the big
1385 * advantage that the container will be able to follow the host's DNS server configuration changes
1386 * transparently. */
1387
1388 if (found == 0) /* missing? */
1389 (void) touch(resolved);
1390
1391 r = mount_verbose(LOG_DEBUG, "/usr/lib/systemd/resolv.conf", resolved, NULL, MS_BIND, NULL);
1392 if (r >= 0)
1393 return mount_verbose(LOG_ERR, NULL, resolved, NULL, MS_BIND|MS_REMOUNT|MS_RDONLY|MS_NOSUID|MS_NODEV, NULL);
1394 }
1395
1396 /* If that didn't work, let's copy the file */
1397 r = copy_file("/etc/resolv.conf", where, O_TRUNC|O_NOFOLLOW, 0644, 0, COPY_REFLINK);
1398 if (r < 0) {
1399 /* If the file already exists as symlink, let's suppress the warning, under the assumption that
1400 * resolved or something similar runs inside and the symlink points there.
1401 *
1402 * If the disk image is read-only, there's also no point in complaining.
1403 */
1404 log_full_errno(IN_SET(r, -ELOOP, -EROFS, -EACCES, -EPERM) ? LOG_DEBUG : LOG_WARNING, r,
1405 "Failed to copy /etc/resolv.conf to %s, ignoring: %m", where);
1406 return 0;
1407 }
1408
1409 r = userns_lchown(where, 0, 0);
1410 if (r < 0)
1411 log_warning_errno(r, "Failed to chown /etc/resolv.conf, ignoring: %m");
1412
1413 return 0;
1414 }
1415
1416 static int setup_boot_id(const char *dest) {
1417 sd_id128_t rnd = SD_ID128_NULL;
1418 const char *from, *to;
1419 int r;
1420
1421 /* Generate a new randomized boot ID, so that each boot-up of
1422 * the container gets a new one */
1423
1424 from = prefix_roota(dest, "/run/proc-sys-kernel-random-boot-id");
1425 to = prefix_roota(dest, "/proc/sys/kernel/random/boot_id");
1426
1427 r = sd_id128_randomize(&rnd);
1428 if (r < 0)
1429 return log_error_errno(r, "Failed to generate random boot id: %m");
1430
1431 r = id128_write(from, ID128_UUID, rnd, false);
1432 if (r < 0)
1433 return log_error_errno(r, "Failed to write boot id: %m");
1434
1435 r = mount_verbose(LOG_ERR, from, to, NULL, MS_BIND, NULL);
1436 if (r >= 0)
1437 r = mount_verbose(LOG_ERR, NULL, to, NULL,
1438 MS_BIND|MS_REMOUNT|MS_RDONLY|MS_NOSUID|MS_NODEV, NULL);
1439
1440 (void) unlink(from);
1441 return r;
1442 }
1443
1444 static int copy_devnodes(const char *dest) {
1445
1446 static const char devnodes[] =
1447 "null\0"
1448 "zero\0"
1449 "full\0"
1450 "random\0"
1451 "urandom\0"
1452 "tty\0"
1453 "net/tun\0";
1454
1455 const char *d;
1456 int r = 0;
1457 _cleanup_umask_ mode_t u;
1458
1459 assert(dest);
1460
1461 u = umask(0000);
1462
1463 /* Create /dev/net, so that we can create /dev/net/tun in it */
1464 if (userns_mkdir(dest, "/dev/net", 0755, 0, 0) < 0)
1465 return log_error_errno(r, "Failed to create /dev/net directory: %m");
1466
1467 NULSTR_FOREACH(d, devnodes) {
1468 _cleanup_free_ char *from = NULL, *to = NULL;
1469 struct stat st;
1470
1471 from = strappend("/dev/", d);
1472 to = prefix_root(dest, from);
1473
1474 if (stat(from, &st) < 0) {
1475
1476 if (errno != ENOENT)
1477 return log_error_errno(errno, "Failed to stat %s: %m", from);
1478
1479 } else if (!S_ISCHR(st.st_mode) && !S_ISBLK(st.st_mode)) {
1480
1481 log_error("%s is not a char or block device, cannot copy.", from);
1482 return -EIO;
1483
1484 } else {
1485 if (mknod(to, st.st_mode, st.st_rdev) < 0) {
1486 /* Explicitly warn the user when /dev is already populated. */
1487 if (errno == EEXIST)
1488 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);
1489 if (errno != EPERM)
1490 return log_error_errno(errno, "mknod(%s) failed: %m", to);
1491
1492 /* Some systems abusively restrict mknod but
1493 * allow bind mounts. */
1494 r = touch(to);
1495 if (r < 0)
1496 return log_error_errno(r, "touch (%s) failed: %m", to);
1497 r = mount_verbose(LOG_DEBUG, from, to, NULL, MS_BIND, NULL);
1498 if (r < 0)
1499 return log_error_errno(r, "Both mknod and bind mount (%s) failed: %m", to);
1500 }
1501
1502 r = userns_lchown(to, 0, 0);
1503 if (r < 0)
1504 return log_error_errno(r, "chown() of device node %s failed: %m", to);
1505 }
1506 }
1507
1508 return r;
1509 }
1510
1511 static int setup_pts(const char *dest) {
1512 _cleanup_free_ char *options = NULL;
1513 const char *p;
1514 int r;
1515
1516 #ifdef HAVE_SELINUX
1517 if (arg_selinux_apifs_context)
1518 (void) asprintf(&options,
1519 "newinstance,ptmxmode=0666,mode=620,gid=" GID_FMT ",context=\"%s\"",
1520 arg_uid_shift + TTY_GID,
1521 arg_selinux_apifs_context);
1522 else
1523 #endif
1524 (void) asprintf(&options,
1525 "newinstance,ptmxmode=0666,mode=620,gid=" GID_FMT,
1526 arg_uid_shift + TTY_GID);
1527
1528 if (!options)
1529 return log_oom();
1530
1531 /* Mount /dev/pts itself */
1532 p = prefix_roota(dest, "/dev/pts");
1533 if (mkdir(p, 0755) < 0)
1534 return log_error_errno(errno, "Failed to create /dev/pts: %m");
1535 r = mount_verbose(LOG_ERR, "devpts", p, "devpts", MS_NOSUID|MS_NOEXEC, options);
1536 if (r < 0)
1537 return r;
1538 r = userns_lchown(p, 0, 0);
1539 if (r < 0)
1540 return log_error_errno(r, "Failed to chown /dev/pts: %m");
1541
1542 /* Create /dev/ptmx symlink */
1543 p = prefix_roota(dest, "/dev/ptmx");
1544 if (symlink("pts/ptmx", p) < 0)
1545 return log_error_errno(errno, "Failed to create /dev/ptmx symlink: %m");
1546 r = userns_lchown(p, 0, 0);
1547 if (r < 0)
1548 return log_error_errno(r, "Failed to chown /dev/ptmx: %m");
1549
1550 /* And fix /dev/pts/ptmx ownership */
1551 p = prefix_roota(dest, "/dev/pts/ptmx");
1552 r = userns_lchown(p, 0, 0);
1553 if (r < 0)
1554 return log_error_errno(r, "Failed to chown /dev/pts/ptmx: %m");
1555
1556 return 0;
1557 }
1558
1559 static int setup_dev_console(const char *dest, const char *console) {
1560 _cleanup_umask_ mode_t u;
1561 const char *to;
1562 int r;
1563
1564 assert(dest);
1565 assert(console);
1566
1567 u = umask(0000);
1568
1569 r = chmod_and_chown(console, 0600, arg_uid_shift, arg_uid_shift);
1570 if (r < 0)
1571 return log_error_errno(r, "Failed to correct access mode for TTY: %m");
1572
1573 /* We need to bind mount the right tty to /dev/console since
1574 * ptys can only exist on pts file systems. To have something
1575 * to bind mount things on we create a empty regular file. */
1576
1577 to = prefix_roota(dest, "/dev/console");
1578 r = touch(to);
1579 if (r < 0)
1580 return log_error_errno(r, "touch() for /dev/console failed: %m");
1581
1582 return mount_verbose(LOG_ERR, console, to, NULL, MS_BIND, NULL);
1583 }
1584
1585 static int setup_kmsg(const char *dest, int kmsg_socket) {
1586 const char *from, *to;
1587 _cleanup_umask_ mode_t u;
1588 int fd, r;
1589
1590 assert(kmsg_socket >= 0);
1591
1592 u = umask(0000);
1593
1594 /* We create the kmsg FIFO as /run/kmsg, but immediately
1595 * delete it after bind mounting it to /proc/kmsg. While FIFOs
1596 * on the reading side behave very similar to /proc/kmsg,
1597 * their writing side behaves differently from /dev/kmsg in
1598 * that writing blocks when nothing is reading. In order to
1599 * avoid any problems with containers deadlocking due to this
1600 * we simply make /dev/kmsg unavailable to the container. */
1601 from = prefix_roota(dest, "/run/kmsg");
1602 to = prefix_roota(dest, "/proc/kmsg");
1603
1604 if (mkfifo(from, 0600) < 0)
1605 return log_error_errno(errno, "mkfifo() for /run/kmsg failed: %m");
1606 r = mount_verbose(LOG_ERR, from, to, NULL, MS_BIND, NULL);
1607 if (r < 0)
1608 return r;
1609
1610 fd = open(from, O_RDWR|O_NDELAY|O_CLOEXEC);
1611 if (fd < 0)
1612 return log_error_errno(errno, "Failed to open fifo: %m");
1613
1614 /* Store away the fd in the socket, so that it stays open as
1615 * long as we run the child */
1616 r = send_one_fd(kmsg_socket, fd, 0);
1617 safe_close(fd);
1618
1619 if (r < 0)
1620 return log_error_errno(r, "Failed to send FIFO fd: %m");
1621
1622 /* And now make the FIFO unavailable as /run/kmsg... */
1623 (void) unlink(from);
1624
1625 return 0;
1626 }
1627
1628 static int on_address_change(sd_netlink *rtnl, sd_netlink_message *m, void *userdata) {
1629 union in_addr_union *exposed = userdata;
1630
1631 assert(rtnl);
1632 assert(m);
1633 assert(exposed);
1634
1635 expose_port_execute(rtnl, arg_expose_ports, exposed);
1636 return 0;
1637 }
1638
1639 static int setup_hostname(void) {
1640
1641 if ((arg_clone_ns_flags & CLONE_NEWUTS) == 0)
1642 return 0;
1643
1644 if (sethostname_idempotent(arg_machine) < 0)
1645 return -errno;
1646
1647 return 0;
1648 }
1649
1650 static int setup_journal(const char *directory) {
1651 sd_id128_t this_id;
1652 _cleanup_free_ char *d = NULL;
1653 const char *p, *q;
1654 bool try;
1655 char id[33];
1656 int r;
1657
1658 /* Don't link journals in ephemeral mode */
1659 if (arg_ephemeral)
1660 return 0;
1661
1662 if (arg_link_journal == LINK_NO)
1663 return 0;
1664
1665 try = arg_link_journal_try || arg_link_journal == LINK_AUTO;
1666
1667 r = sd_id128_get_machine(&this_id);
1668 if (r < 0)
1669 return log_error_errno(r, "Failed to retrieve machine ID: %m");
1670
1671 if (sd_id128_equal(arg_uuid, this_id)) {
1672 log_full(try ? LOG_WARNING : LOG_ERR,
1673 "Host and machine ids are equal (%s): refusing to link journals", sd_id128_to_string(arg_uuid, id));
1674 if (try)
1675 return 0;
1676 return -EEXIST;
1677 }
1678
1679 r = userns_mkdir(directory, "/var", 0755, 0, 0);
1680 if (r < 0)
1681 return log_error_errno(r, "Failed to create /var: %m");
1682
1683 r = userns_mkdir(directory, "/var/log", 0755, 0, 0);
1684 if (r < 0)
1685 return log_error_errno(r, "Failed to create /var/log: %m");
1686
1687 r = userns_mkdir(directory, "/var/log/journal", 0755, 0, 0);
1688 if (r < 0)
1689 return log_error_errno(r, "Failed to create /var/log/journal: %m");
1690
1691 (void) sd_id128_to_string(arg_uuid, id);
1692
1693 p = strjoina("/var/log/journal/", id);
1694 q = prefix_roota(directory, p);
1695
1696 if (path_is_mount_point(p, NULL, 0) > 0) {
1697 if (try)
1698 return 0;
1699
1700 log_error("%s: already a mount point, refusing to use for journal", p);
1701 return -EEXIST;
1702 }
1703
1704 if (path_is_mount_point(q, NULL, 0) > 0) {
1705 if (try)
1706 return 0;
1707
1708 log_error("%s: already a mount point, refusing to use for journal", q);
1709 return -EEXIST;
1710 }
1711
1712 r = readlink_and_make_absolute(p, &d);
1713 if (r >= 0) {
1714 if ((arg_link_journal == LINK_GUEST ||
1715 arg_link_journal == LINK_AUTO) &&
1716 path_equal(d, q)) {
1717
1718 r = userns_mkdir(directory, p, 0755, 0, 0);
1719 if (r < 0)
1720 log_warning_errno(r, "Failed to create directory %s: %m", q);
1721 return 0;
1722 }
1723
1724 if (unlink(p) < 0)
1725 return log_error_errno(errno, "Failed to remove symlink %s: %m", p);
1726 } else if (r == -EINVAL) {
1727
1728 if (arg_link_journal == LINK_GUEST &&
1729 rmdir(p) < 0) {
1730
1731 if (errno == ENOTDIR) {
1732 log_error("%s already exists and is neither a symlink nor a directory", p);
1733 return r;
1734 } else
1735 return log_error_errno(errno, "Failed to remove %s: %m", p);
1736 }
1737 } else if (r != -ENOENT)
1738 return log_error_errno(r, "readlink(%s) failed: %m", p);
1739
1740 if (arg_link_journal == LINK_GUEST) {
1741
1742 if (symlink(q, p) < 0) {
1743 if (try) {
1744 log_debug_errno(errno, "Failed to symlink %s to %s, skipping journal setup: %m", q, p);
1745 return 0;
1746 } else
1747 return log_error_errno(errno, "Failed to symlink %s to %s: %m", q, p);
1748 }
1749
1750 r = userns_mkdir(directory, p, 0755, 0, 0);
1751 if (r < 0)
1752 log_warning_errno(r, "Failed to create directory %s: %m", q);
1753 return 0;
1754 }
1755
1756 if (arg_link_journal == LINK_HOST) {
1757 /* don't create parents here — if the host doesn't have
1758 * permanent journal set up, don't force it here */
1759
1760 if (mkdir(p, 0755) < 0 && errno != EEXIST) {
1761 if (try) {
1762 log_debug_errno(errno, "Failed to create %s, skipping journal setup: %m", p);
1763 return 0;
1764 } else
1765 return log_error_errno(errno, "Failed to create %s: %m", p);
1766 }
1767
1768 } else if (access(p, F_OK) < 0)
1769 return 0;
1770
1771 if (dir_is_empty(q) == 0)
1772 log_warning("%s is not empty, proceeding anyway.", q);
1773
1774 r = userns_mkdir(directory, p, 0755, 0, 0);
1775 if (r < 0)
1776 return log_error_errno(r, "Failed to create %s: %m", q);
1777
1778 r = mount_verbose(LOG_DEBUG, p, q, NULL, MS_BIND, NULL);
1779 if (r < 0)
1780 return log_error_errno(errno, "Failed to bind mount journal from host into guest: %m");
1781
1782 return 0;
1783 }
1784
1785 static int drop_capabilities(void) {
1786 return capability_bounding_set_drop(arg_caps_retain, false);
1787 }
1788
1789 static int reset_audit_loginuid(void) {
1790 _cleanup_free_ char *p = NULL;
1791 int r;
1792
1793 if ((arg_clone_ns_flags & CLONE_NEWPID) == 0)
1794 return 0;
1795
1796 r = read_one_line_file("/proc/self/loginuid", &p);
1797 if (r == -ENOENT)
1798 return 0;
1799 if (r < 0)
1800 return log_error_errno(r, "Failed to read /proc/self/loginuid: %m");
1801
1802 /* Already reset? */
1803 if (streq(p, "4294967295"))
1804 return 0;
1805
1806 r = write_string_file("/proc/self/loginuid", "4294967295", 0);
1807 if (r < 0) {
1808 log_error_errno(r,
1809 "Failed to reset audit login UID. This probably means that your kernel is too\n"
1810 "old and you have audit enabled. Note that the auditing subsystem is known to\n"
1811 "be incompatible with containers on old kernels. Please make sure to upgrade\n"
1812 "your kernel or to off auditing with 'audit=0' on the kernel command line before\n"
1813 "using systemd-nspawn. Sleeping for 5s... (%m)");
1814
1815 sleep(5);
1816 }
1817
1818 return 0;
1819 }
1820
1821
1822 static int setup_propagate(const char *root) {
1823 const char *p, *q;
1824 int r;
1825
1826 (void) mkdir_p("/run/systemd/nspawn/", 0755);
1827 (void) mkdir_p("/run/systemd/nspawn/propagate", 0600);
1828 p = strjoina("/run/systemd/nspawn/propagate/", arg_machine);
1829 (void) mkdir_p(p, 0600);
1830
1831 r = userns_mkdir(root, "/run/systemd", 0755, 0, 0);
1832 if (r < 0)
1833 return log_error_errno(r, "Failed to create /run/systemd: %m");
1834
1835 r = userns_mkdir(root, "/run/systemd/nspawn", 0755, 0, 0);
1836 if (r < 0)
1837 return log_error_errno(r, "Failed to create /run/systemd/nspawn: %m");
1838
1839 r = userns_mkdir(root, "/run/systemd/nspawn/incoming", 0600, 0, 0);
1840 if (r < 0)
1841 return log_error_errno(r, "Failed to create /run/systemd/nspawn/incoming: %m");
1842
1843 q = prefix_roota(root, "/run/systemd/nspawn/incoming");
1844 r = mount_verbose(LOG_ERR, p, q, NULL, MS_BIND, NULL);
1845 if (r < 0)
1846 return r;
1847
1848 r = mount_verbose(LOG_ERR, NULL, q, NULL, MS_BIND|MS_REMOUNT|MS_RDONLY, NULL);
1849 if (r < 0)
1850 return r;
1851
1852 /* machined will MS_MOVE into that directory, and that's only
1853 * supported for non-shared mounts. */
1854 return mount_verbose(LOG_ERR, NULL, q, NULL, MS_SLAVE, NULL);
1855 }
1856
1857 static int setup_machine_id(const char *directory) {
1858 const char *etc_machine_id;
1859 sd_id128_t id;
1860 int r;
1861
1862 /* If the UUID in the container is already set, then that's what counts, and we use. If it isn't set, and the
1863 * caller passed --uuid=, then we'll pass it in the $container_uuid env var to PID 1 of the container. The
1864 * assumption is that PID 1 will then write it to /etc/machine-id to make it persistent. If --uuid= is not
1865 * passed we generate a random UUID, and pass it via $container_uuid. In effect this means that /etc/machine-id
1866 * in the container and our idea of the container UUID will always be in sync (at least if PID 1 in the
1867 * container behaves nicely). */
1868
1869 etc_machine_id = prefix_roota(directory, "/etc/machine-id");
1870
1871 r = id128_read(etc_machine_id, ID128_PLAIN, &id);
1872 if (r < 0) {
1873 if (!IN_SET(r, -ENOENT, -ENOMEDIUM)) /* If the file is missing or empty, we don't mind */
1874 return log_error_errno(r, "Failed to read machine ID from container image: %m");
1875
1876 if (sd_id128_is_null(arg_uuid)) {
1877 r = sd_id128_randomize(&arg_uuid);
1878 if (r < 0)
1879 return log_error_errno(r, "Failed to acquire randomized machine UUID: %m");
1880 }
1881 } else {
1882 if (sd_id128_is_null(id)) {
1883 log_error("Machine ID in container image is zero, refusing.");
1884 return -EINVAL;
1885 }
1886
1887 arg_uuid = id;
1888 }
1889
1890 return 0;
1891 }
1892
1893 static int recursive_chown(const char *directory, uid_t shift, uid_t range) {
1894 int r;
1895
1896 assert(directory);
1897
1898 if (arg_userns_mode == USER_NAMESPACE_NO || !arg_userns_chown)
1899 return 0;
1900
1901 r = path_patch_uid(directory, arg_uid_shift, arg_uid_range);
1902 if (r == -EOPNOTSUPP)
1903 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.");
1904 if (r == -EBADE)
1905 return log_error_errno(r, "Upper 16 bits of root directory UID and GID do not match.");
1906 if (r < 0)
1907 return log_error_errno(r, "Failed to adjust UID/GID shift of OS tree: %m");
1908 if (r == 0)
1909 log_debug("Root directory of image is already owned by the right UID/GID range, skipping recursive chown operation.");
1910 else
1911 log_debug("Patched directory tree to match UID/GID range.");
1912
1913 return r;
1914 }
1915
1916 /*
1917 * Return values:
1918 * < 0 : wait_for_terminate() failed to get the state of the
1919 * container, the container was terminated by a signal, or
1920 * failed for an unknown reason. No change is made to the
1921 * container argument.
1922 * > 0 : The program executed in the container terminated with an
1923 * error. The exit code of the program executed in the
1924 * container is returned. The container argument has been set
1925 * to CONTAINER_TERMINATED.
1926 * 0 : The container is being rebooted, has been shut down or exited
1927 * successfully. The container argument has been set to either
1928 * CONTAINER_TERMINATED or CONTAINER_REBOOTED.
1929 *
1930 * That is, success is indicated by a return value of zero, and an
1931 * error is indicated by a non-zero value.
1932 */
1933 static int wait_for_container(pid_t pid, ContainerStatus *container) {
1934 siginfo_t status;
1935 int r;
1936
1937 r = wait_for_terminate(pid, &status);
1938 if (r < 0)
1939 return log_warning_errno(r, "Failed to wait for container: %m");
1940
1941 switch (status.si_code) {
1942
1943 case CLD_EXITED:
1944 if (status.si_status == 0)
1945 log_full(arg_quiet ? LOG_DEBUG : LOG_INFO, "Container %s exited successfully.", arg_machine);
1946 else
1947 log_full(arg_quiet ? LOG_DEBUG : LOG_INFO, "Container %s failed with error code %i.", arg_machine, status.si_status);
1948
1949 *container = CONTAINER_TERMINATED;
1950 return status.si_status;
1951
1952 case CLD_KILLED:
1953 if (status.si_status == SIGINT) {
1954 log_full(arg_quiet ? LOG_DEBUG : LOG_INFO, "Container %s has been shut down.", arg_machine);
1955 *container = CONTAINER_TERMINATED;
1956 return 0;
1957
1958 } else if (status.si_status == SIGHUP) {
1959 log_full(arg_quiet ? LOG_DEBUG : LOG_INFO, "Container %s is being rebooted.", arg_machine);
1960 *container = CONTAINER_REBOOTED;
1961 return 0;
1962 }
1963
1964 /* fall through */
1965
1966 case CLD_DUMPED:
1967 log_error("Container %s terminated by signal %s.", arg_machine, signal_to_string(status.si_status));
1968 return -EIO;
1969
1970 default:
1971 log_error("Container %s failed due to unknown reason.", arg_machine);
1972 return -EIO;
1973 }
1974 }
1975
1976 static int on_orderly_shutdown(sd_event_source *s, const struct signalfd_siginfo *si, void *userdata) {
1977 pid_t pid;
1978
1979 pid = PTR_TO_PID(userdata);
1980 if (pid > 0) {
1981 if (kill(pid, arg_kill_signal) >= 0) {
1982 log_info("Trying to halt container. Send SIGTERM again to trigger immediate termination.");
1983 sd_event_source_set_userdata(s, NULL);
1984 return 0;
1985 }
1986 }
1987
1988 sd_event_exit(sd_event_source_get_event(s), 0);
1989 return 0;
1990 }
1991
1992 static int on_sigchld(sd_event_source *s, const struct signalfd_siginfo *ssi, void *userdata) {
1993 for (;;) {
1994 siginfo_t si = {};
1995 if (waitid(P_ALL, 0, &si, WNOHANG|WNOWAIT|WEXITED) < 0)
1996 return log_error_errno(errno, "Failed to waitid(): %m");
1997 if (si.si_pid == 0) /* No pending children. */
1998 break;
1999 if (si.si_pid == PTR_TO_PID(userdata)) {
2000 /* The main process we care for has exited. Return from
2001 * signal handler but leave the zombie. */
2002 sd_event_exit(sd_event_source_get_event(s), 0);
2003 break;
2004 }
2005 /* Reap all other children. */
2006 (void) waitid(P_PID, si.si_pid, &si, WNOHANG|WEXITED);
2007 }
2008
2009 return 0;
2010 }
2011
2012 static int determine_names(void) {
2013 int r;
2014
2015 if (arg_template && !arg_directory && arg_machine) {
2016
2017 /* If --template= was specified then we should not
2018 * search for a machine, but instead create a new one
2019 * in /var/lib/machine. */
2020
2021 arg_directory = strjoin("/var/lib/machines/", arg_machine);
2022 if (!arg_directory)
2023 return log_oom();
2024 }
2025
2026 if (!arg_image && !arg_directory) {
2027 if (arg_machine) {
2028 _cleanup_(image_unrefp) Image *i = NULL;
2029
2030 r = image_find(arg_machine, &i);
2031 if (r < 0)
2032 return log_error_errno(r, "Failed to find image for machine '%s': %m", arg_machine);
2033 if (r == 0) {
2034 log_error("No image for machine '%s': %m", arg_machine);
2035 return -ENOENT;
2036 }
2037
2038 if (i->type == IMAGE_RAW)
2039 r = free_and_strdup(&arg_image, i->path);
2040 else
2041 r = free_and_strdup(&arg_directory, i->path);
2042 if (r < 0)
2043 return log_oom();
2044
2045 if (!arg_ephemeral)
2046 arg_read_only = arg_read_only || i->read_only;
2047 } else
2048 arg_directory = get_current_dir_name();
2049
2050 if (!arg_directory && !arg_image) {
2051 log_error("Failed to determine path, please use -D or -i.");
2052 return -EINVAL;
2053 }
2054 }
2055
2056 if (!arg_machine) {
2057
2058 if (arg_directory && path_equal(arg_directory, "/"))
2059 arg_machine = gethostname_malloc();
2060 else {
2061 if (arg_image) {
2062 char *e;
2063
2064 arg_machine = strdup(basename(arg_image));
2065
2066 /* Truncate suffix if there is one */
2067 e = endswith(arg_machine, ".raw");
2068 if (e)
2069 *e = 0;
2070 } else
2071 arg_machine = strdup(basename(arg_directory));
2072 }
2073 if (!arg_machine)
2074 return log_oom();
2075
2076 hostname_cleanup(arg_machine);
2077 if (!machine_name_is_valid(arg_machine)) {
2078 log_error("Failed to determine machine name automatically, please use -M.");
2079 return -EINVAL;
2080 }
2081
2082 if (arg_ephemeral) {
2083 char *b;
2084
2085 /* Add a random suffix when this is an
2086 * ephemeral machine, so that we can run many
2087 * instances at once without manually having
2088 * to specify -M each time. */
2089
2090 if (asprintf(&b, "%s-%016" PRIx64, arg_machine, random_u64()) < 0)
2091 return log_oom();
2092
2093 free(arg_machine);
2094 arg_machine = b;
2095 }
2096 }
2097
2098 return 0;
2099 }
2100
2101 static int chase_symlinks_and_update(char **p, unsigned flags) {
2102 char *chased;
2103 int r;
2104
2105 assert(p);
2106
2107 if (!*p)
2108 return 0;
2109
2110 r = chase_symlinks(*p, NULL, flags, &chased);
2111 if (r < 0)
2112 return log_error_errno(r, "Failed to resolve path %s: %m", *p);
2113
2114 free(*p);
2115 *p = chased;
2116
2117 return 0;
2118 }
2119
2120 static int determine_uid_shift(const char *directory) {
2121 int r;
2122
2123 if (arg_userns_mode == USER_NAMESPACE_NO) {
2124 arg_uid_shift = 0;
2125 return 0;
2126 }
2127
2128 if (arg_uid_shift == UID_INVALID) {
2129 struct stat st;
2130
2131 r = stat(directory, &st);
2132 if (r < 0)
2133 return log_error_errno(errno, "Failed to determine UID base of %s: %m", directory);
2134
2135 arg_uid_shift = st.st_uid & UINT32_C(0xffff0000);
2136
2137 if (arg_uid_shift != (st.st_gid & UINT32_C(0xffff0000))) {
2138 log_error("UID and GID base of %s don't match.", directory);
2139 return -EINVAL;
2140 }
2141
2142 arg_uid_range = UINT32_C(0x10000);
2143 }
2144
2145 if (arg_uid_shift > (uid_t) -1 - arg_uid_range) {
2146 log_error("UID base too high for UID range.");
2147 return -EINVAL;
2148 }
2149
2150 return 0;
2151 }
2152
2153 static int inner_child(
2154 Barrier *barrier,
2155 const char *directory,
2156 bool secondary,
2157 int kmsg_socket,
2158 int rtnl_socket,
2159 FDSet *fds) {
2160
2161 _cleanup_free_ char *home = NULL;
2162 char as_uuid[37];
2163 unsigned n_env = 1;
2164 const char *envp[] = {
2165 "PATH=" DEFAULT_PATH_SPLIT_USR,
2166 NULL, /* container */
2167 NULL, /* TERM */
2168 NULL, /* HOME */
2169 NULL, /* USER */
2170 NULL, /* LOGNAME */
2171 NULL, /* container_uuid */
2172 NULL, /* LISTEN_FDS */
2173 NULL, /* LISTEN_PID */
2174 NULL, /* NOTIFY_SOCKET */
2175 NULL
2176 };
2177 const char *exec_target;
2178
2179 _cleanup_strv_free_ char **env_use = NULL;
2180 int r;
2181
2182 assert(barrier);
2183 assert(directory);
2184 assert(kmsg_socket >= 0);
2185
2186 if (arg_userns_mode != USER_NAMESPACE_NO) {
2187 /* Tell the parent, that it now can write the UID map. */
2188 (void) barrier_place(barrier); /* #1 */
2189
2190 /* Wait until the parent wrote the UID map */
2191 if (!barrier_place_and_sync(barrier)) { /* #2 */
2192 log_error("Parent died too early");
2193 return -ESRCH;
2194 }
2195 }
2196
2197 r = reset_uid_gid();
2198 if (r < 0)
2199 return log_error_errno(r, "Couldn't become new root: %m");
2200
2201 r = mount_all(NULL,
2202 arg_mount_settings | MOUNT_IN_USERNS,
2203 arg_uid_shift,
2204 arg_uid_range,
2205 arg_selinux_apifs_context);
2206
2207 if (r < 0)
2208 return r;
2209
2210 r = mount_sysfs(NULL, arg_mount_settings);
2211 if (r < 0)
2212 return r;
2213
2214 /* Wait until we are cgroup-ified, so that we
2215 * can mount the right cgroup path writable */
2216 if (!barrier_place_and_sync(barrier)) { /* #3 */
2217 log_error("Parent died too early");
2218 return -ESRCH;
2219 }
2220
2221 if (arg_use_cgns && cg_ns_supported()) {
2222 r = unshare(CLONE_NEWCGROUP);
2223 if (r < 0)
2224 return log_error_errno(errno, "Failed to unshare cgroup namespace");
2225 r = mount_cgroups(
2226 "",
2227 arg_unified_cgroup_hierarchy,
2228 arg_userns_mode != USER_NAMESPACE_NO,
2229 arg_uid_shift,
2230 arg_uid_range,
2231 arg_selinux_apifs_context,
2232 true);
2233 if (r < 0)
2234 return r;
2235 } else {
2236 r = mount_systemd_cgroup_writable("", arg_unified_cgroup_hierarchy);
2237 if (r < 0)
2238 return r;
2239 }
2240
2241 r = setup_boot_id(NULL);
2242 if (r < 0)
2243 return r;
2244
2245 r = setup_kmsg(NULL, kmsg_socket);
2246 if (r < 0)
2247 return r;
2248 kmsg_socket = safe_close(kmsg_socket);
2249
2250 umask(0022);
2251
2252 if (setsid() < 0)
2253 return log_error_errno(errno, "setsid() failed: %m");
2254
2255 if (arg_private_network)
2256 loopback_setup();
2257
2258 if (arg_expose_ports) {
2259 r = expose_port_send_rtnl(rtnl_socket);
2260 if (r < 0)
2261 return r;
2262 rtnl_socket = safe_close(rtnl_socket);
2263 }
2264
2265 r = drop_capabilities();
2266 if (r < 0)
2267 return log_error_errno(r, "drop_capabilities() failed: %m");
2268
2269 setup_hostname();
2270
2271 if (arg_personality != PERSONALITY_INVALID) {
2272 if (personality(arg_personality) < 0)
2273 return log_error_errno(errno, "personality() failed: %m");
2274 } else if (secondary) {
2275 if (personality(PER_LINUX32) < 0)
2276 return log_error_errno(errno, "personality() failed: %m");
2277 }
2278
2279 #ifdef HAVE_SELINUX
2280 if (arg_selinux_context)
2281 if (setexeccon(arg_selinux_context) < 0)
2282 return log_error_errno(errno, "setexeccon(\"%s\") failed: %m", arg_selinux_context);
2283 #endif
2284
2285 r = change_uid_gid(arg_user, &home);
2286 if (r < 0)
2287 return r;
2288
2289 /* LXC sets container=lxc, so follow the scheme here */
2290 envp[n_env++] = strjoina("container=", arg_container_service_name);
2291
2292 envp[n_env] = strv_find_prefix(environ, "TERM=");
2293 if (envp[n_env])
2294 n_env++;
2295
2296 if ((asprintf((char**)(envp + n_env++), "HOME=%s", home ? home: "/root") < 0) ||
2297 (asprintf((char**)(envp + n_env++), "USER=%s", arg_user ? arg_user : "root") < 0) ||
2298 (asprintf((char**)(envp + n_env++), "LOGNAME=%s", arg_user ? arg_user : "root") < 0))
2299 return log_oom();
2300
2301 assert(!sd_id128_is_null(arg_uuid));
2302
2303 if (asprintf((char**)(envp + n_env++), "container_uuid=%s", id128_to_uuid_string(arg_uuid, as_uuid)) < 0)
2304 return log_oom();
2305
2306 if (fdset_size(fds) > 0) {
2307 r = fdset_cloexec(fds, false);
2308 if (r < 0)
2309 return log_error_errno(r, "Failed to unset O_CLOEXEC for file descriptors.");
2310
2311 if ((asprintf((char **)(envp + n_env++), "LISTEN_FDS=%u", fdset_size(fds)) < 0) ||
2312 (asprintf((char **)(envp + n_env++), "LISTEN_PID=1") < 0))
2313 return log_oom();
2314 }
2315 if (asprintf((char **)(envp + n_env++), "NOTIFY_SOCKET=%s", NSPAWN_NOTIFY_SOCKET_PATH) < 0)
2316 return log_oom();
2317
2318 env_use = strv_env_merge(2, envp, arg_setenv);
2319 if (!env_use)
2320 return log_oom();
2321
2322 /* Let the parent know that we are ready and
2323 * wait until the parent is ready with the
2324 * setup, too... */
2325 if (!barrier_place_and_sync(barrier)) { /* #4 */
2326 log_error("Parent died too early");
2327 return -ESRCH;
2328 }
2329
2330 if (arg_chdir)
2331 if (chdir(arg_chdir) < 0)
2332 return log_error_errno(errno, "Failed to change to specified working directory %s: %m", arg_chdir);
2333
2334 if (arg_start_mode == START_PID2) {
2335 r = stub_pid1(arg_uuid);
2336 if (r < 0)
2337 return r;
2338 }
2339
2340 /* Now, explicitly close the log, so that we
2341 * then can close all remaining fds. Closing
2342 * the log explicitly first has the benefit
2343 * that the logging subsystem knows about it,
2344 * and is thus ready to be reopened should we
2345 * need it again. Note that the other fds
2346 * closed here are at least the locking and
2347 * barrier fds. */
2348 log_close();
2349 (void) fdset_close_others(fds);
2350
2351 if (arg_start_mode == START_BOOT) {
2352 char **a;
2353 size_t m;
2354
2355 /* Automatically search for the init system */
2356
2357 m = strv_length(arg_parameters);
2358 a = newa(char*, m + 2);
2359 memcpy_safe(a + 1, arg_parameters, m * sizeof(char*));
2360 a[1 + m] = NULL;
2361
2362 a[0] = (char*) "/usr/lib/systemd/systemd";
2363 execve(a[0], a, env_use);
2364
2365 a[0] = (char*) "/lib/systemd/systemd";
2366 execve(a[0], a, env_use);
2367
2368 a[0] = (char*) "/sbin/init";
2369 execve(a[0], a, env_use);
2370
2371 exec_target = "/usr/lib/systemd/systemd, /lib/systemd/systemd, /sbin/init";
2372 } else if (!strv_isempty(arg_parameters)) {
2373 exec_target = arg_parameters[0];
2374 execvpe(arg_parameters[0], arg_parameters, env_use);
2375 } else {
2376 if (!arg_chdir)
2377 /* If we cannot change the directory, we'll end up in /, that is expected. */
2378 (void) chdir(home ?: "/root");
2379
2380 execle("/bin/bash", "-bash", NULL, env_use);
2381 execle("/bin/sh", "-sh", NULL, env_use);
2382
2383 exec_target = "/bin/bash, /bin/sh";
2384 }
2385
2386 r = -errno;
2387 (void) log_open();
2388 return log_error_errno(r, "execv(%s) failed: %m", exec_target);
2389 }
2390
2391 static int setup_sd_notify_child(void) {
2392 static const int one = 1;
2393 int fd = -1;
2394 union sockaddr_union sa = {
2395 .sa.sa_family = AF_UNIX,
2396 };
2397 int r;
2398
2399 fd = socket(AF_UNIX, SOCK_DGRAM|SOCK_CLOEXEC|SOCK_NONBLOCK, 0);
2400 if (fd < 0)
2401 return log_error_errno(errno, "Failed to allocate notification socket: %m");
2402
2403 (void) mkdir_parents(NSPAWN_NOTIFY_SOCKET_PATH, 0755);
2404 (void) unlink(NSPAWN_NOTIFY_SOCKET_PATH);
2405
2406 strncpy(sa.un.sun_path, NSPAWN_NOTIFY_SOCKET_PATH, sizeof(sa.un.sun_path)-1);
2407 r = bind(fd, &sa.sa, SOCKADDR_UN_LEN(sa.un));
2408 if (r < 0) {
2409 safe_close(fd);
2410 return log_error_errno(errno, "bind(%s) failed: %m", sa.un.sun_path);
2411 }
2412
2413 r = userns_lchown(NSPAWN_NOTIFY_SOCKET_PATH, 0, 0);
2414 if (r < 0) {
2415 safe_close(fd);
2416 return log_error_errno(r, "Failed to chown " NSPAWN_NOTIFY_SOCKET_PATH ": %m");
2417 }
2418
2419 r = setsockopt(fd, SOL_SOCKET, SO_PASSCRED, &one, sizeof(one));
2420 if (r < 0) {
2421 safe_close(fd);
2422 return log_error_errno(errno, "SO_PASSCRED failed: %m");
2423 }
2424
2425 return fd;
2426 }
2427
2428 static int outer_child(
2429 Barrier *barrier,
2430 const char *directory,
2431 const char *console,
2432 DissectedImage *dissected_image,
2433 bool interactive,
2434 bool secondary,
2435 int pid_socket,
2436 int uuid_socket,
2437 int notify_socket,
2438 int kmsg_socket,
2439 int rtnl_socket,
2440 int uid_shift_socket,
2441 FDSet *fds) {
2442
2443 pid_t pid;
2444 ssize_t l;
2445 int r;
2446 _cleanup_close_ int fd = -1;
2447
2448 assert(barrier);
2449 assert(directory);
2450 assert(console);
2451 assert(pid_socket >= 0);
2452 assert(uuid_socket >= 0);
2453 assert(notify_socket >= 0);
2454 assert(kmsg_socket >= 0);
2455
2456 if (prctl(PR_SET_PDEATHSIG, SIGKILL) < 0)
2457 return log_error_errno(errno, "PR_SET_PDEATHSIG failed: %m");
2458
2459 if (interactive) {
2460 close_nointr(STDIN_FILENO);
2461 close_nointr(STDOUT_FILENO);
2462 close_nointr(STDERR_FILENO);
2463
2464 r = open_terminal(console, O_RDWR);
2465 if (r != STDIN_FILENO) {
2466 if (r >= 0) {
2467 safe_close(r);
2468 r = -EINVAL;
2469 }
2470
2471 return log_error_errno(r, "Failed to open console: %m");
2472 }
2473
2474 if (dup2(STDIN_FILENO, STDOUT_FILENO) != STDOUT_FILENO ||
2475 dup2(STDIN_FILENO, STDERR_FILENO) != STDERR_FILENO)
2476 return log_error_errno(errno, "Failed to duplicate console: %m");
2477 }
2478
2479 r = reset_audit_loginuid();
2480 if (r < 0)
2481 return r;
2482
2483 /* Mark everything as slave, so that we still
2484 * receive mounts from the real root, but don't
2485 * propagate mounts to the real root. */
2486 r = mount_verbose(LOG_ERR, NULL, "/", NULL, MS_SLAVE|MS_REC, NULL);
2487 if (r < 0)
2488 return r;
2489
2490 if (dissected_image) {
2491 r = dissected_image_mount(dissected_image, directory, DISSECT_IMAGE_DISCARD_ON_LOOP|(arg_read_only ? DISSECT_IMAGE_READ_ONLY : 0));
2492 if (r < 0)
2493 return r;
2494 }
2495
2496 r = determine_uid_shift(directory);
2497 if (r < 0)
2498 return r;
2499
2500 if (arg_userns_mode != USER_NAMESPACE_NO) {
2501 /* Let the parent know which UID shift we read from the image */
2502 l = send(uid_shift_socket, &arg_uid_shift, sizeof(arg_uid_shift), MSG_NOSIGNAL);
2503 if (l < 0)
2504 return log_error_errno(errno, "Failed to send UID shift: %m");
2505 if (l != sizeof(arg_uid_shift)) {
2506 log_error("Short write while sending UID shift.");
2507 return -EIO;
2508 }
2509
2510 if (arg_userns_mode == USER_NAMESPACE_PICK) {
2511 /* When we are supposed to pick the UID shift, the parent will check now whether the UID shift
2512 * we just read from the image is available. If yes, it will send the UID shift back to us, if
2513 * not it will pick a different one, and send it back to us. */
2514
2515 l = recv(uid_shift_socket, &arg_uid_shift, sizeof(arg_uid_shift), 0);
2516 if (l < 0)
2517 return log_error_errno(errno, "Failed to recv UID shift: %m");
2518 if (l != sizeof(arg_uid_shift)) {
2519 log_error("Short read while receiving UID shift.");
2520 return -EIO;
2521 }
2522 }
2523
2524 log_info("Selected user namespace base " UID_FMT " and range " UID_FMT ".", arg_uid_shift, arg_uid_range);
2525 }
2526
2527 /* Turn directory into bind mount */
2528 r = mount_verbose(LOG_ERR, directory, directory, NULL, MS_BIND|MS_REC, NULL);
2529 if (r < 0)
2530 return r;
2531
2532 r = setup_pivot_root(
2533 directory,
2534 arg_pivot_root_new,
2535 arg_pivot_root_old);
2536 if (r < 0)
2537 return r;
2538
2539 r = setup_volatile(
2540 directory,
2541 arg_volatile_mode,
2542 arg_userns_mode != USER_NAMESPACE_NO,
2543 arg_uid_shift,
2544 arg_uid_range,
2545 arg_selinux_context);
2546 if (r < 0)
2547 return r;
2548
2549 r = setup_volatile_state(
2550 directory,
2551 arg_volatile_mode,
2552 arg_userns_mode != USER_NAMESPACE_NO,
2553 arg_uid_shift,
2554 arg_uid_range,
2555 arg_selinux_context);
2556 if (r < 0)
2557 return r;
2558
2559 /* Mark everything as shared so our mounts get propagated down. This is
2560 * required to make new bind mounts available in systemd services
2561 * inside the containter that create a new mount namespace.
2562 * See https://github.com/systemd/systemd/issues/3860
2563 * Further submounts (such as /dev) done after this will inherit the
2564 * shared propagation mode. */
2565 r = mount_verbose(LOG_ERR, NULL, directory, NULL, MS_SHARED|MS_REC, NULL);
2566 if (r < 0)
2567 return r;
2568
2569 r = recursive_chown(directory, arg_uid_shift, arg_uid_range);
2570 if (r < 0)
2571 return r;
2572
2573 r = base_filesystem_create(directory, arg_uid_shift, (gid_t) arg_uid_shift);
2574 if (r < 0)
2575 return r;
2576
2577 if (arg_read_only) {
2578 r = bind_remount_recursive(directory, true, NULL);
2579 if (r < 0)
2580 return log_error_errno(r, "Failed to make tree read-only: %m");
2581 }
2582
2583 r = mount_all(directory,
2584 arg_mount_settings,
2585 arg_uid_shift,
2586 arg_uid_range,
2587 arg_selinux_apifs_context);
2588 if (r < 0)
2589 return r;
2590
2591 r = copy_devnodes(directory);
2592 if (r < 0)
2593 return r;
2594
2595 dev_setup(directory, arg_uid_shift, arg_uid_shift);
2596
2597 r = setup_pts(directory);
2598 if (r < 0)
2599 return r;
2600
2601 r = setup_propagate(directory);
2602 if (r < 0)
2603 return r;
2604
2605 r = setup_dev_console(directory, console);
2606 if (r < 0)
2607 return r;
2608
2609 r = setup_seccomp(arg_caps_retain);
2610 if (r < 0)
2611 return r;
2612
2613 r = setup_timezone(directory);
2614 if (r < 0)
2615 return r;
2616
2617 r = setup_resolv_conf(directory);
2618 if (r < 0)
2619 return r;
2620
2621 r = setup_machine_id(directory);
2622 if (r < 0)
2623 return r;
2624
2625 r = setup_journal(directory);
2626 if (r < 0)
2627 return r;
2628
2629 r = mount_custom(
2630 directory,
2631 arg_custom_mounts,
2632 arg_n_custom_mounts,
2633 arg_userns_mode != USER_NAMESPACE_NO,
2634 arg_uid_shift,
2635 arg_uid_range,
2636 arg_selinux_apifs_context);
2637 if (r < 0)
2638 return r;
2639
2640 if (!arg_use_cgns || !cg_ns_supported()) {
2641 r = mount_cgroups(
2642 directory,
2643 arg_unified_cgroup_hierarchy,
2644 arg_userns_mode != USER_NAMESPACE_NO,
2645 arg_uid_shift,
2646 arg_uid_range,
2647 arg_selinux_apifs_context,
2648 false);
2649 if (r < 0)
2650 return r;
2651 }
2652
2653 r = mount_move_root(directory);
2654 if (r < 0)
2655 return log_error_errno(r, "Failed to move root directory: %m");
2656
2657 fd = setup_sd_notify_child();
2658 if (fd < 0)
2659 return fd;
2660
2661 pid = raw_clone(SIGCHLD|CLONE_NEWNS|
2662 arg_clone_ns_flags |
2663 (arg_private_network ? CLONE_NEWNET : 0) |
2664 (arg_userns_mode != USER_NAMESPACE_NO ? CLONE_NEWUSER : 0));
2665 if (pid < 0)
2666 return log_error_errno(errno, "Failed to fork inner child: %m");
2667 if (pid == 0) {
2668 pid_socket = safe_close(pid_socket);
2669 uuid_socket = safe_close(uuid_socket);
2670 notify_socket = safe_close(notify_socket);
2671 uid_shift_socket = safe_close(uid_shift_socket);
2672
2673 /* The inner child has all namespaces that are
2674 * requested, so that we all are owned by the user if
2675 * user namespaces are turned on. */
2676
2677 r = inner_child(barrier, directory, secondary, kmsg_socket, rtnl_socket, fds);
2678 if (r < 0)
2679 _exit(EXIT_FAILURE);
2680
2681 _exit(EXIT_SUCCESS);
2682 }
2683
2684 l = send(pid_socket, &pid, sizeof(pid), MSG_NOSIGNAL);
2685 if (l < 0)
2686 return log_error_errno(errno, "Failed to send PID: %m");
2687 if (l != sizeof(pid)) {
2688 log_error("Short write while sending PID.");
2689 return -EIO;
2690 }
2691
2692 l = send(uuid_socket, &arg_uuid, sizeof(arg_uuid), MSG_NOSIGNAL);
2693 if (l < 0)
2694 return log_error_errno(errno, "Failed to send machine ID: %m");
2695 if (l != sizeof(arg_uuid)) {
2696 log_error("Short write while sending machine ID.");
2697 return -EIO;
2698 }
2699
2700 l = send_one_fd(notify_socket, fd, 0);
2701 if (l < 0)
2702 return log_error_errno(errno, "Failed to send notify fd: %m");
2703
2704 pid_socket = safe_close(pid_socket);
2705 uuid_socket = safe_close(uuid_socket);
2706 notify_socket = safe_close(notify_socket);
2707 kmsg_socket = safe_close(kmsg_socket);
2708 rtnl_socket = safe_close(rtnl_socket);
2709
2710 return 0;
2711 }
2712
2713 static int uid_shift_pick(uid_t *shift, LockFile *ret_lock_file) {
2714 unsigned n_tries = 100;
2715 uid_t candidate;
2716 int r;
2717
2718 assert(shift);
2719 assert(ret_lock_file);
2720 assert(arg_userns_mode == USER_NAMESPACE_PICK);
2721 assert(arg_uid_range == 0x10000U);
2722
2723 candidate = *shift;
2724
2725 (void) mkdir("/run/systemd/nspawn-uid", 0755);
2726
2727 for (;;) {
2728 char lock_path[strlen("/run/systemd/nspawn-uid/") + DECIMAL_STR_MAX(uid_t) + 1];
2729 _cleanup_release_lock_file_ LockFile lf = LOCK_FILE_INIT;
2730
2731 if (--n_tries <= 0)
2732 return -EBUSY;
2733
2734 if (candidate < UID_SHIFT_PICK_MIN || candidate > UID_SHIFT_PICK_MAX)
2735 goto next;
2736 if ((candidate & UINT32_C(0xFFFF)) != 0)
2737 goto next;
2738
2739 xsprintf(lock_path, "/run/systemd/nspawn-uid/" UID_FMT, candidate);
2740 r = make_lock_file(lock_path, LOCK_EX|LOCK_NB, &lf);
2741 if (r == -EBUSY) /* Range already taken by another nspawn instance */
2742 goto next;
2743 if (r < 0)
2744 return r;
2745
2746 /* Make some superficial checks whether the range is currently known in the user database */
2747 if (getpwuid(candidate))
2748 goto next;
2749 if (getpwuid(candidate + UINT32_C(0xFFFE)))
2750 goto next;
2751 if (getgrgid(candidate))
2752 goto next;
2753 if (getgrgid(candidate + UINT32_C(0xFFFE)))
2754 goto next;
2755
2756 *ret_lock_file = lf;
2757 lf = (struct LockFile) LOCK_FILE_INIT;
2758 *shift = candidate;
2759 return 0;
2760
2761 next:
2762 random_bytes(&candidate, sizeof(candidate));
2763 candidate = (candidate % (UID_SHIFT_PICK_MAX - UID_SHIFT_PICK_MIN)) + UID_SHIFT_PICK_MIN;
2764 candidate &= (uid_t) UINT32_C(0xFFFF0000);
2765 }
2766 }
2767
2768 static int setup_uid_map(pid_t pid) {
2769 char uid_map[strlen("/proc//uid_map") + DECIMAL_STR_MAX(uid_t) + 1], line[DECIMAL_STR_MAX(uid_t)*3+3+1];
2770 int r;
2771
2772 assert(pid > 1);
2773
2774 xsprintf(uid_map, "/proc/" PID_FMT "/uid_map", pid);
2775 xsprintf(line, UID_FMT " " UID_FMT " " UID_FMT "\n", 0, arg_uid_shift, arg_uid_range);
2776 r = write_string_file(uid_map, line, 0);
2777 if (r < 0)
2778 return log_error_errno(r, "Failed to write UID map: %m");
2779
2780 /* We always assign the same UID and GID ranges */
2781 xsprintf(uid_map, "/proc/" PID_FMT "/gid_map", pid);
2782 r = write_string_file(uid_map, line, 0);
2783 if (r < 0)
2784 return log_error_errno(r, "Failed to write GID map: %m");
2785
2786 return 0;
2787 }
2788
2789 static int nspawn_dispatch_notify_fd(sd_event_source *source, int fd, uint32_t revents, void *userdata) {
2790 char buf[NOTIFY_BUFFER_MAX+1];
2791 char *p = NULL;
2792 struct iovec iovec = {
2793 .iov_base = buf,
2794 .iov_len = sizeof(buf)-1,
2795 };
2796 union {
2797 struct cmsghdr cmsghdr;
2798 uint8_t buf[CMSG_SPACE(sizeof(struct ucred)) +
2799 CMSG_SPACE(sizeof(int) * NOTIFY_FD_MAX)];
2800 } control = {};
2801 struct msghdr msghdr = {
2802 .msg_iov = &iovec,
2803 .msg_iovlen = 1,
2804 .msg_control = &control,
2805 .msg_controllen = sizeof(control),
2806 };
2807 struct cmsghdr *cmsg;
2808 struct ucred *ucred = NULL;
2809 ssize_t n;
2810 pid_t inner_child_pid;
2811 _cleanup_strv_free_ char **tags = NULL;
2812
2813 assert(userdata);
2814
2815 inner_child_pid = PTR_TO_PID(userdata);
2816
2817 if (revents != EPOLLIN) {
2818 log_warning("Got unexpected poll event for notify fd.");
2819 return 0;
2820 }
2821
2822 n = recvmsg(fd, &msghdr, MSG_DONTWAIT|MSG_CMSG_CLOEXEC);
2823 if (n < 0) {
2824 if (errno == EAGAIN || errno == EINTR)
2825 return 0;
2826
2827 return log_warning_errno(errno, "Couldn't read notification socket: %m");
2828 }
2829 cmsg_close_all(&msghdr);
2830
2831 CMSG_FOREACH(cmsg, &msghdr) {
2832 if (cmsg->cmsg_level == SOL_SOCKET &&
2833 cmsg->cmsg_type == SCM_CREDENTIALS &&
2834 cmsg->cmsg_len == CMSG_LEN(sizeof(struct ucred))) {
2835
2836 ucred = (struct ucred*) CMSG_DATA(cmsg);
2837 }
2838 }
2839
2840 if (!ucred || ucred->pid != inner_child_pid) {
2841 log_warning("Received notify message without valid credentials. Ignoring.");
2842 return 0;
2843 }
2844
2845 if ((size_t) n >= sizeof(buf)) {
2846 log_warning("Received notify message exceeded maximum size. Ignoring.");
2847 return 0;
2848 }
2849
2850 buf[n] = 0;
2851 tags = strv_split(buf, "\n\r");
2852 if (!tags)
2853 return log_oom();
2854
2855 if (strv_find(tags, "READY=1"))
2856 sd_notifyf(false, "READY=1\n");
2857
2858 p = strv_find_startswith(tags, "STATUS=");
2859 if (p)
2860 sd_notifyf(false, "STATUS=Container running: %s", p);
2861
2862 return 0;
2863 }
2864
2865 static int setup_sd_notify_parent(sd_event *event, int fd, pid_t *inner_child_pid, sd_event_source **notify_event_source) {
2866 int r;
2867
2868 r = sd_event_add_io(event, notify_event_source, fd, EPOLLIN, nspawn_dispatch_notify_fd, inner_child_pid);
2869 if (r < 0)
2870 return log_error_errno(r, "Failed to allocate notify event source: %m");
2871
2872 (void) sd_event_source_set_description(*notify_event_source, "nspawn-notify");
2873
2874 return 0;
2875 }
2876
2877 static int load_settings(void) {
2878 _cleanup_(settings_freep) Settings *settings = NULL;
2879 _cleanup_fclose_ FILE *f = NULL;
2880 _cleanup_free_ char *p = NULL;
2881 const char *fn, *i;
2882 int r;
2883
2884 /* If all settings are masked, there's no point in looking for
2885 * the settings file */
2886 if ((arg_settings_mask & _SETTINGS_MASK_ALL) == _SETTINGS_MASK_ALL)
2887 return 0;
2888
2889 fn = strjoina(arg_machine, ".nspawn");
2890
2891 /* We first look in the admin's directories in /etc and /run */
2892 FOREACH_STRING(i, "/etc/systemd/nspawn", "/run/systemd/nspawn") {
2893 _cleanup_free_ char *j = NULL;
2894
2895 j = strjoin(i, "/", fn);
2896 if (!j)
2897 return log_oom();
2898
2899 f = fopen(j, "re");
2900 if (f) {
2901 p = j;
2902 j = NULL;
2903
2904 /* By default, we trust configuration from /etc and /run */
2905 if (arg_settings_trusted < 0)
2906 arg_settings_trusted = true;
2907
2908 break;
2909 }
2910
2911 if (errno != ENOENT)
2912 return log_error_errno(errno, "Failed to open %s: %m", j);
2913 }
2914
2915 if (!f) {
2916 /* After that, let's look for a file next to the
2917 * actual image we shall boot. */
2918
2919 if (arg_image) {
2920 p = file_in_same_dir(arg_image, fn);
2921 if (!p)
2922 return log_oom();
2923 } else if (arg_directory) {
2924 p = file_in_same_dir(arg_directory, fn);
2925 if (!p)
2926 return log_oom();
2927 }
2928
2929 if (p) {
2930 f = fopen(p, "re");
2931 if (!f && errno != ENOENT)
2932 return log_error_errno(errno, "Failed to open %s: %m", p);
2933
2934 /* By default, we do not trust configuration from /var/lib/machines */
2935 if (arg_settings_trusted < 0)
2936 arg_settings_trusted = false;
2937 }
2938 }
2939
2940 if (!f)
2941 return 0;
2942
2943 log_debug("Settings are trusted: %s", yes_no(arg_settings_trusted));
2944
2945 r = settings_load(f, p, &settings);
2946 if (r < 0)
2947 return r;
2948
2949 /* Copy over bits from the settings, unless they have been
2950 * explicitly masked by command line switches. */
2951
2952 if ((arg_settings_mask & SETTING_START_MODE) == 0 &&
2953 settings->start_mode >= 0) {
2954 arg_start_mode = settings->start_mode;
2955
2956 strv_free(arg_parameters);
2957 arg_parameters = settings->parameters;
2958 settings->parameters = NULL;
2959 }
2960
2961 if ((arg_settings_mask & SETTING_PIVOT_ROOT) == 0 &&
2962 settings->pivot_root_new) {
2963 free_and_replace(arg_pivot_root_new, settings->pivot_root_new);
2964 free_and_replace(arg_pivot_root_old, settings->pivot_root_old);
2965 }
2966
2967 if ((arg_settings_mask & SETTING_WORKING_DIRECTORY) == 0 &&
2968 settings->working_directory) {
2969 free(arg_chdir);
2970 arg_chdir = settings->working_directory;
2971 settings->working_directory = NULL;
2972 }
2973
2974 if ((arg_settings_mask & SETTING_ENVIRONMENT) == 0 &&
2975 settings->environment) {
2976 strv_free(arg_setenv);
2977 arg_setenv = settings->environment;
2978 settings->environment = NULL;
2979 }
2980
2981 if ((arg_settings_mask & SETTING_USER) == 0 &&
2982 settings->user) {
2983 free(arg_user);
2984 arg_user = settings->user;
2985 settings->user = NULL;
2986 }
2987
2988 if ((arg_settings_mask & SETTING_CAPABILITY) == 0) {
2989 uint64_t plus;
2990
2991 plus = settings->capability;
2992 if (settings_private_network(settings))
2993 plus |= (1ULL << CAP_NET_ADMIN);
2994
2995 if (!arg_settings_trusted && plus != 0) {
2996 if (settings->capability != 0)
2997 log_warning("Ignoring Capability= setting, file %s is not trusted.", p);
2998 } else
2999 arg_caps_retain |= plus;
3000
3001 arg_caps_retain &= ~settings->drop_capability;
3002 }
3003
3004 if ((arg_settings_mask & SETTING_KILL_SIGNAL) == 0 &&
3005 settings->kill_signal > 0)
3006 arg_kill_signal = settings->kill_signal;
3007
3008 if ((arg_settings_mask & SETTING_PERSONALITY) == 0 &&
3009 settings->personality != PERSONALITY_INVALID)
3010 arg_personality = settings->personality;
3011
3012 if ((arg_settings_mask & SETTING_MACHINE_ID) == 0 &&
3013 !sd_id128_is_null(settings->machine_id)) {
3014
3015 if (!arg_settings_trusted)
3016 log_warning("Ignoring MachineID= setting, file %s is not trusted.", p);
3017 else
3018 arg_uuid = settings->machine_id;
3019 }
3020
3021 if ((arg_settings_mask & SETTING_READ_ONLY) == 0 &&
3022 settings->read_only >= 0)
3023 arg_read_only = settings->read_only;
3024
3025 if ((arg_settings_mask & SETTING_VOLATILE_MODE) == 0 &&
3026 settings->volatile_mode != _VOLATILE_MODE_INVALID)
3027 arg_volatile_mode = settings->volatile_mode;
3028
3029 if ((arg_settings_mask & SETTING_CUSTOM_MOUNTS) == 0 &&
3030 settings->n_custom_mounts > 0) {
3031
3032 if (!arg_settings_trusted)
3033 log_warning("Ignoring TemporaryFileSystem=, Bind= and BindReadOnly= settings, file %s is not trusted.", p);
3034 else {
3035 custom_mount_free_all(arg_custom_mounts, arg_n_custom_mounts);
3036 arg_custom_mounts = settings->custom_mounts;
3037 arg_n_custom_mounts = settings->n_custom_mounts;
3038
3039 settings->custom_mounts = NULL;
3040 settings->n_custom_mounts = 0;
3041 }
3042 }
3043
3044 if ((arg_settings_mask & SETTING_NETWORK) == 0 &&
3045 (settings->private_network >= 0 ||
3046 settings->network_veth >= 0 ||
3047 settings->network_bridge ||
3048 settings->network_zone ||
3049 settings->network_interfaces ||
3050 settings->network_macvlan ||
3051 settings->network_ipvlan ||
3052 settings->network_veth_extra)) {
3053
3054 if (!arg_settings_trusted)
3055 log_warning("Ignoring network settings, file %s is not trusted.", p);
3056 else {
3057 arg_network_veth = settings_network_veth(settings);
3058 arg_private_network = settings_private_network(settings);
3059
3060 strv_free(arg_network_interfaces);
3061 arg_network_interfaces = settings->network_interfaces;
3062 settings->network_interfaces = NULL;
3063
3064 strv_free(arg_network_macvlan);
3065 arg_network_macvlan = settings->network_macvlan;
3066 settings->network_macvlan = NULL;
3067
3068 strv_free(arg_network_ipvlan);
3069 arg_network_ipvlan = settings->network_ipvlan;
3070 settings->network_ipvlan = NULL;
3071
3072 strv_free(arg_network_veth_extra);
3073 arg_network_veth_extra = settings->network_veth_extra;
3074 settings->network_veth_extra = NULL;
3075
3076 free(arg_network_bridge);
3077 arg_network_bridge = settings->network_bridge;
3078 settings->network_bridge = NULL;
3079
3080 free(arg_network_zone);
3081 arg_network_zone = settings->network_zone;
3082 settings->network_zone = NULL;
3083 }
3084 }
3085
3086 if ((arg_settings_mask & SETTING_EXPOSE_PORTS) == 0 &&
3087 settings->expose_ports) {
3088
3089 if (!arg_settings_trusted)
3090 log_warning("Ignoring Port= setting, file %s is not trusted.", p);
3091 else {
3092 expose_port_free_all(arg_expose_ports);
3093 arg_expose_ports = settings->expose_ports;
3094 settings->expose_ports = NULL;
3095 }
3096 }
3097
3098 if ((arg_settings_mask & SETTING_USERNS) == 0 &&
3099 settings->userns_mode != _USER_NAMESPACE_MODE_INVALID) {
3100
3101 if (!arg_settings_trusted)
3102 log_warning("Ignoring PrivateUsers= and PrivateUsersChown= settings, file %s is not trusted.", p);
3103 else {
3104 arg_userns_mode = settings->userns_mode;
3105 arg_uid_shift = settings->uid_shift;
3106 arg_uid_range = settings->uid_range;
3107 arg_userns_chown = settings->userns_chown;
3108 }
3109 }
3110
3111 if ((arg_settings_mask & SETTING_NOTIFY_READY) == 0)
3112 arg_notify_ready = settings->notify_ready;
3113
3114 return 0;
3115 }
3116
3117 static int run(int master,
3118 const char* console,
3119 DissectedImage *dissected_image,
3120 bool interactive,
3121 bool secondary,
3122 FDSet *fds,
3123 char veth_name[IFNAMSIZ], bool *veth_created,
3124 union in_addr_union *exposed,
3125 pid_t *pid, int *ret) {
3126
3127 static const struct sigaction sa = {
3128 .sa_handler = nop_signal_handler,
3129 .sa_flags = SA_NOCLDSTOP|SA_RESTART,
3130 };
3131
3132 _cleanup_release_lock_file_ LockFile uid_shift_lock = LOCK_FILE_INIT;
3133 _cleanup_close_ int etc_passwd_lock = -1;
3134 _cleanup_close_pair_ int
3135 kmsg_socket_pair[2] = { -1, -1 },
3136 rtnl_socket_pair[2] = { -1, -1 },
3137 pid_socket_pair[2] = { -1, -1 },
3138 uuid_socket_pair[2] = { -1, -1 },
3139 notify_socket_pair[2] = { -1, -1 },
3140 uid_shift_socket_pair[2] = { -1, -1 };
3141 _cleanup_close_ int notify_socket= -1;
3142 _cleanup_(barrier_destroy) Barrier barrier = BARRIER_NULL;
3143 _cleanup_(sd_event_source_unrefp) sd_event_source *notify_event_source = NULL;
3144 _cleanup_(sd_event_unrefp) sd_event *event = NULL;
3145 _cleanup_(pty_forward_freep) PTYForward *forward = NULL;
3146 _cleanup_(sd_netlink_unrefp) sd_netlink *rtnl = NULL;
3147 ContainerStatus container_status = 0;
3148 char last_char = 0;
3149 int ifi = 0, r;
3150 ssize_t l;
3151 sigset_t mask_chld;
3152
3153 assert_se(sigemptyset(&mask_chld) == 0);
3154 assert_se(sigaddset(&mask_chld, SIGCHLD) == 0);
3155
3156 if (arg_userns_mode == USER_NAMESPACE_PICK) {
3157 /* When we shall pick the UID/GID range, let's first lock /etc/passwd, so that we can safely
3158 * check with getpwuid() if the specific user already exists. Note that /etc might be
3159 * read-only, in which case this will fail with EROFS. But that's really OK, as in that case we
3160 * can be reasonably sure that no users are going to be added. Note that getpwuid() checks are
3161 * really just an extra safety net. We kinda assume that the UID range we allocate from is
3162 * really ours. */
3163
3164 etc_passwd_lock = take_etc_passwd_lock(NULL);
3165 if (etc_passwd_lock < 0 && etc_passwd_lock != -EROFS)
3166 return log_error_errno(etc_passwd_lock, "Failed to take /etc/passwd lock: %m");
3167 }
3168
3169 r = barrier_create(&barrier);
3170 if (r < 0)
3171 return log_error_errno(r, "Cannot initialize IPC barrier: %m");
3172
3173 if (socketpair(AF_UNIX, SOCK_SEQPACKET|SOCK_CLOEXEC, 0, kmsg_socket_pair) < 0)
3174 return log_error_errno(errno, "Failed to create kmsg socket pair: %m");
3175
3176 if (socketpair(AF_UNIX, SOCK_SEQPACKET|SOCK_CLOEXEC, 0, rtnl_socket_pair) < 0)
3177 return log_error_errno(errno, "Failed to create rtnl socket pair: %m");
3178
3179 if (socketpair(AF_UNIX, SOCK_SEQPACKET|SOCK_CLOEXEC, 0, pid_socket_pair) < 0)
3180 return log_error_errno(errno, "Failed to create pid socket pair: %m");
3181
3182 if (socketpair(AF_UNIX, SOCK_SEQPACKET|SOCK_CLOEXEC, 0, uuid_socket_pair) < 0)
3183 return log_error_errno(errno, "Failed to create id socket pair: %m");
3184
3185 if (socketpair(AF_UNIX, SOCK_SEQPACKET|SOCK_CLOEXEC, 0, notify_socket_pair) < 0)
3186 return log_error_errno(errno, "Failed to create notify socket pair: %m");
3187
3188 if (arg_userns_mode != USER_NAMESPACE_NO)
3189 if (socketpair(AF_UNIX, SOCK_SEQPACKET|SOCK_CLOEXEC, 0, uid_shift_socket_pair) < 0)
3190 return log_error_errno(errno, "Failed to create uid shift socket pair: %m");
3191
3192 /* Child can be killed before execv(), so handle SIGCHLD in order to interrupt
3193 * parent's blocking calls and give it a chance to call wait() and terminate. */
3194 r = sigprocmask(SIG_UNBLOCK, &mask_chld, NULL);
3195 if (r < 0)
3196 return log_error_errno(errno, "Failed to change the signal mask: %m");
3197
3198 r = sigaction(SIGCHLD, &sa, NULL);
3199 if (r < 0)
3200 return log_error_errno(errno, "Failed to install SIGCHLD handler: %m");
3201
3202 *pid = raw_clone(SIGCHLD|CLONE_NEWNS);
3203 if (*pid < 0)
3204 return log_error_errno(errno, "clone() failed%s: %m",
3205 errno == EINVAL ?
3206 ", do you have namespace support enabled in your kernel? (You need UTS, IPC, PID and NET namespacing built in)" : "");
3207
3208 if (*pid == 0) {
3209 /* The outer child only has a file system namespace. */
3210 barrier_set_role(&barrier, BARRIER_CHILD);
3211
3212 master = safe_close(master);
3213
3214 kmsg_socket_pair[0] = safe_close(kmsg_socket_pair[0]);
3215 rtnl_socket_pair[0] = safe_close(rtnl_socket_pair[0]);
3216 pid_socket_pair[0] = safe_close(pid_socket_pair[0]);
3217 uuid_socket_pair[0] = safe_close(uuid_socket_pair[0]);
3218 notify_socket_pair[0] = safe_close(notify_socket_pair[0]);
3219 uid_shift_socket_pair[0] = safe_close(uid_shift_socket_pair[0]);
3220
3221 (void) reset_all_signal_handlers();
3222 (void) reset_signal_mask();
3223
3224 r = outer_child(&barrier,
3225 arg_directory,
3226 console,
3227 dissected_image,
3228 interactive,
3229 secondary,
3230 pid_socket_pair[1],
3231 uuid_socket_pair[1],
3232 notify_socket_pair[1],
3233 kmsg_socket_pair[1],
3234 rtnl_socket_pair[1],
3235 uid_shift_socket_pair[1],
3236 fds);
3237 if (r < 0)
3238 _exit(EXIT_FAILURE);
3239
3240 _exit(EXIT_SUCCESS);
3241 }
3242
3243 barrier_set_role(&barrier, BARRIER_PARENT);
3244
3245 fds = fdset_free(fds);
3246
3247 kmsg_socket_pair[1] = safe_close(kmsg_socket_pair[1]);
3248 rtnl_socket_pair[1] = safe_close(rtnl_socket_pair[1]);
3249 pid_socket_pair[1] = safe_close(pid_socket_pair[1]);
3250 uuid_socket_pair[1] = safe_close(uuid_socket_pair[1]);
3251 notify_socket_pair[1] = safe_close(notify_socket_pair[1]);
3252 uid_shift_socket_pair[1] = safe_close(uid_shift_socket_pair[1]);
3253
3254 if (arg_userns_mode != USER_NAMESPACE_NO) {
3255 /* The child just let us know the UID shift it might have read from the image. */
3256 l = recv(uid_shift_socket_pair[0], &arg_uid_shift, sizeof arg_uid_shift, 0);
3257 if (l < 0)
3258 return log_error_errno(errno, "Failed to read UID shift: %m");
3259 if (l != sizeof arg_uid_shift) {
3260 log_error("Short read while reading UID shift.");
3261 return -EIO;
3262 }
3263
3264 if (arg_userns_mode == USER_NAMESPACE_PICK) {
3265 /* If we are supposed to pick the UID shift, let's try to use the shift read from the
3266 * image, but if that's already in use, pick a new one, and report back to the child,
3267 * which one we now picked. */
3268
3269 r = uid_shift_pick(&arg_uid_shift, &uid_shift_lock);
3270 if (r < 0)
3271 return log_error_errno(r, "Failed to pick suitable UID/GID range: %m");
3272
3273 l = send(uid_shift_socket_pair[0], &arg_uid_shift, sizeof arg_uid_shift, MSG_NOSIGNAL);
3274 if (l < 0)
3275 return log_error_errno(errno, "Failed to send UID shift: %m");
3276 if (l != sizeof arg_uid_shift) {
3277 log_error("Short write while writing UID shift.");
3278 return -EIO;
3279 }
3280 }
3281 }
3282
3283 /* Wait for the outer child. */
3284 r = wait_for_terminate_and_warn("namespace helper", *pid, NULL);
3285 if (r != 0)
3286 return r < 0 ? r : -EIO;
3287
3288 /* And now retrieve the PID of the inner child. */
3289 l = recv(pid_socket_pair[0], pid, sizeof *pid, 0);
3290 if (l < 0)
3291 return log_error_errno(errno, "Failed to read inner child PID: %m");
3292 if (l != sizeof *pid) {
3293 log_error("Short read while reading inner child PID.");
3294 return -EIO;
3295 }
3296
3297 /* We also retrieve container UUID in case it was generated by outer child */
3298 l = recv(uuid_socket_pair[0], &arg_uuid, sizeof arg_uuid, 0);
3299 if (l < 0)
3300 return log_error_errno(errno, "Failed to read container machine ID: %m");
3301 if (l != sizeof(arg_uuid)) {
3302 log_error("Short read while reading container machined ID.");
3303 return -EIO;
3304 }
3305
3306 /* We also retrieve the socket used for notifications generated by outer child */
3307 notify_socket = receive_one_fd(notify_socket_pair[0], 0);
3308 if (notify_socket < 0)
3309 return log_error_errno(notify_socket,
3310 "Failed to receive notification socket from the outer child: %m");
3311
3312 log_debug("Init process invoked as PID "PID_FMT, *pid);
3313
3314 if (arg_userns_mode != USER_NAMESPACE_NO) {
3315 if (!barrier_place_and_sync(&barrier)) { /* #1 */
3316 log_error("Child died too early.");
3317 return -ESRCH;
3318 }
3319
3320 r = setup_uid_map(*pid);
3321 if (r < 0)
3322 return r;
3323
3324 (void) barrier_place(&barrier); /* #2 */
3325 }
3326
3327 if (arg_private_network) {
3328
3329 r = move_network_interfaces(*pid, arg_network_interfaces);
3330 if (r < 0)
3331 return r;
3332
3333 if (arg_network_veth) {
3334 r = setup_veth(arg_machine, *pid, veth_name,
3335 arg_network_bridge || arg_network_zone);
3336 if (r < 0)
3337 return r;
3338 else if (r > 0)
3339 ifi = r;
3340
3341 if (arg_network_bridge) {
3342 /* Add the interface to a bridge */
3343 r = setup_bridge(veth_name, arg_network_bridge, false);
3344 if (r < 0)
3345 return r;
3346 if (r > 0)
3347 ifi = r;
3348 } else if (arg_network_zone) {
3349 /* Add the interface to a bridge, possibly creating it */
3350 r = setup_bridge(veth_name, arg_network_zone, true);
3351 if (r < 0)
3352 return r;
3353 if (r > 0)
3354 ifi = r;
3355 }
3356 }
3357
3358 r = setup_veth_extra(arg_machine, *pid, arg_network_veth_extra);
3359 if (r < 0)
3360 return r;
3361
3362 /* We created the primary and extra veth links now; let's remember this, so that we know to
3363 remove them later on. Note that we don't bother with removing veth links that were created
3364 here when their setup failed half-way, because in that case the kernel should be able to
3365 remove them on its own, since they cannot be referenced by anything yet. */
3366 *veth_created = true;
3367
3368 r = setup_macvlan(arg_machine, *pid, arg_network_macvlan);
3369 if (r < 0)
3370 return r;
3371
3372 r = setup_ipvlan(arg_machine, *pid, arg_network_ipvlan);
3373 if (r < 0)
3374 return r;
3375 }
3376
3377 if (arg_register) {
3378 r = register_machine(
3379 arg_machine,
3380 *pid,
3381 arg_directory,
3382 arg_uuid,
3383 ifi,
3384 arg_slice,
3385 arg_custom_mounts, arg_n_custom_mounts,
3386 arg_kill_signal,
3387 arg_property,
3388 arg_keep_unit,
3389 arg_container_service_name);
3390 if (r < 0)
3391 return r;
3392 }
3393
3394 r = sync_cgroup(*pid, arg_unified_cgroup_hierarchy, arg_uid_shift);
3395 if (r < 0)
3396 return r;
3397
3398 if (arg_keep_unit) {
3399 r = create_subcgroup(*pid, arg_unified_cgroup_hierarchy);
3400 if (r < 0)
3401 return r;
3402 }
3403
3404 r = chown_cgroup(*pid, arg_uid_shift);
3405 if (r < 0)
3406 return r;
3407
3408 /* Notify the child that the parent is ready with all
3409 * its setup (including cgroup-ification), and that
3410 * the child can now hand over control to the code to
3411 * run inside the container. */
3412 (void) barrier_place(&barrier); /* #3 */
3413
3414 /* Block SIGCHLD here, before notifying child.
3415 * process_pty() will handle it with the other signals. */
3416 assert_se(sigprocmask(SIG_BLOCK, &mask_chld, NULL) >= 0);
3417
3418 /* Reset signal to default */
3419 r = default_signals(SIGCHLD, -1);
3420 if (r < 0)
3421 return log_error_errno(r, "Failed to reset SIGCHLD: %m");
3422
3423 r = sd_event_new(&event);
3424 if (r < 0)
3425 return log_error_errno(r, "Failed to get default event source: %m");
3426
3427 r = setup_sd_notify_parent(event, notify_socket, PID_TO_PTR(*pid), &notify_event_source);
3428 if (r < 0)
3429 return r;
3430
3431 /* Let the child know that we are ready and wait that the child is completely ready now. */
3432 if (!barrier_place_and_sync(&barrier)) { /* #4 */
3433 log_error("Child died too early.");
3434 return -ESRCH;
3435 }
3436
3437 /* At this point we have made use of the UID we picked, and thus nss-mymachines
3438 * will make them appear in getpwuid(), thus we can release the /etc/passwd lock. */
3439 etc_passwd_lock = safe_close(etc_passwd_lock);
3440
3441 sd_notifyf(false,
3442 "STATUS=Container running.\n"
3443 "X_NSPAWN_LEADER_PID=" PID_FMT, *pid);
3444 if (!arg_notify_ready)
3445 sd_notify(false, "READY=1\n");
3446
3447 if (arg_kill_signal > 0) {
3448 /* Try to kill the init system on SIGINT or SIGTERM */
3449 sd_event_add_signal(event, NULL, SIGINT, on_orderly_shutdown, PID_TO_PTR(*pid));
3450 sd_event_add_signal(event, NULL, SIGTERM, on_orderly_shutdown, PID_TO_PTR(*pid));
3451 } else {
3452 /* Immediately exit */
3453 sd_event_add_signal(event, NULL, SIGINT, NULL, NULL);
3454 sd_event_add_signal(event, NULL, SIGTERM, NULL, NULL);
3455 }
3456
3457 /* Exit when the child exits */
3458 sd_event_add_signal(event, NULL, SIGCHLD, on_sigchld, PID_TO_PTR(*pid));
3459
3460 if (arg_expose_ports) {
3461 r = expose_port_watch_rtnl(event, rtnl_socket_pair[0], on_address_change, exposed, &rtnl);
3462 if (r < 0)
3463 return r;
3464
3465 (void) expose_port_execute(rtnl, arg_expose_ports, exposed);
3466 }
3467
3468 rtnl_socket_pair[0] = safe_close(rtnl_socket_pair[0]);
3469
3470 r = pty_forward_new(event, master,
3471 PTY_FORWARD_IGNORE_VHANGUP | (interactive ? 0 : PTY_FORWARD_READ_ONLY),
3472 &forward);
3473 if (r < 0)
3474 return log_error_errno(r, "Failed to create PTY forwarder: %m");
3475
3476 r = sd_event_loop(event);
3477 if (r < 0)
3478 return log_error_errno(r, "Failed to run event loop: %m");
3479
3480 pty_forward_get_last_char(forward, &last_char);
3481
3482 forward = pty_forward_free(forward);
3483
3484 if (!arg_quiet && last_char != '\n')
3485 putc('\n', stdout);
3486
3487 /* Kill if it is not dead yet anyway */
3488 if (arg_register && !arg_keep_unit)
3489 terminate_machine(*pid);
3490
3491 /* Normally redundant, but better safe than sorry */
3492 (void) kill(*pid, SIGKILL);
3493
3494 r = wait_for_container(*pid, &container_status);
3495 *pid = 0;
3496
3497 if (r < 0)
3498 /* We failed to wait for the container, or the container exited abnormally. */
3499 return r;
3500 if (r > 0 || container_status == CONTAINER_TERMINATED) {
3501 /* r > 0 → The container exited with a non-zero status.
3502 * As a special case, we need to replace 133 with a different value,
3503 * because 133 is special-cased in the service file to reboot the container.
3504 * otherwise → The container exited with zero status and a reboot was not requested.
3505 */
3506 if (r == EXIT_FORCE_RESTART)
3507 r = EXIT_FAILURE; /* replace 133 with the general failure code */
3508 *ret = r;
3509 return 0; /* finito */
3510 }
3511
3512 /* CONTAINER_REBOOTED, loop again */
3513
3514 if (arg_keep_unit) {
3515 /* Special handling if we are running as a service: instead of simply
3516 * restarting the machine we want to restart the entire service, so let's
3517 * inform systemd about this with the special exit code 133. The service
3518 * file uses RestartForceExitStatus=133 so that this results in a full
3519 * nspawn restart. This is necessary since we might have cgroup parameters
3520 * set we want to have flushed out. */
3521 *ret = EXIT_FORCE_RESTART;
3522 return 0; /* finito */
3523 }
3524
3525 expose_port_flush(arg_expose_ports, exposed);
3526
3527 (void) remove_veth_links(veth_name, arg_network_veth_extra);
3528 *veth_created = false;
3529 return 1; /* loop again */
3530 }
3531
3532 int main(int argc, char *argv[]) {
3533
3534 _cleanup_free_ char *console = NULL;
3535 _cleanup_close_ int master = -1;
3536 _cleanup_fdset_free_ FDSet *fds = NULL;
3537 int r, n_fd_passed, ret = EXIT_SUCCESS;
3538 char veth_name[IFNAMSIZ] = "";
3539 bool secondary = false, remove_directory = false, remove_image = false;
3540 pid_t pid = 0;
3541 union in_addr_union exposed = {};
3542 _cleanup_release_lock_file_ LockFile tree_global_lock = LOCK_FILE_INIT, tree_local_lock = LOCK_FILE_INIT;
3543 bool interactive, veth_created = false, remove_tmprootdir = false;
3544 char tmprootdir[] = "/tmp/nspawn-root-XXXXXX";
3545 _cleanup_(loop_device_unrefp) LoopDevice *loop = NULL;
3546 _cleanup_(decrypted_image_unrefp) DecryptedImage *decrypted_image = NULL;
3547 _cleanup_(dissected_image_unrefp) DissectedImage *dissected_image = NULL;
3548
3549 log_parse_environment();
3550 log_open();
3551
3552 /* Make sure rename_process() in the stub init process can work */
3553 saved_argv = argv;
3554 saved_argc = argc;
3555
3556 r = parse_argv(argc, argv);
3557 if (r <= 0)
3558 goto finish;
3559
3560 if (geteuid() != 0) {
3561 log_error("Need to be root.");
3562 r = -EPERM;
3563 goto finish;
3564 }
3565 r = determine_names();
3566 if (r < 0)
3567 goto finish;
3568
3569 r = load_settings();
3570 if (r < 0)
3571 goto finish;
3572
3573 r = verify_arguments();
3574 if (r < 0)
3575 goto finish;
3576
3577 n_fd_passed = sd_listen_fds(false);
3578 if (n_fd_passed > 0) {
3579 r = fdset_new_listen_fds(&fds, false);
3580 if (r < 0) {
3581 log_error_errno(r, "Failed to collect file descriptors: %m");
3582 goto finish;
3583 }
3584 }
3585
3586 if (arg_directory) {
3587 assert(!arg_image);
3588
3589 if (path_equal(arg_directory, "/") && !arg_ephemeral) {
3590 log_error("Spawning container on root directory is not supported. Consider using --ephemeral.");
3591 r = -EINVAL;
3592 goto finish;
3593 }
3594
3595 if (arg_ephemeral) {
3596 _cleanup_free_ char *np = NULL;
3597
3598 r = chase_symlinks_and_update(&arg_directory, 0);
3599 if (r < 0)
3600 goto finish;
3601
3602 /* If the specified path is a mount point we
3603 * generate the new snapshot immediately
3604 * inside it under a random name. However if
3605 * the specified is not a mount point we
3606 * create the new snapshot in the parent
3607 * directory, just next to it. */
3608 r = path_is_mount_point(arg_directory, NULL, 0);
3609 if (r < 0) {
3610 log_error_errno(r, "Failed to determine whether directory %s is mount point: %m", arg_directory);
3611 goto finish;
3612 }
3613 if (r > 0)
3614 r = tempfn_random_child(arg_directory, "machine.", &np);
3615 else
3616 r = tempfn_random(arg_directory, "machine.", &np);
3617 if (r < 0) {
3618 log_error_errno(r, "Failed to generate name for directory snapshot: %m");
3619 goto finish;
3620 }
3621
3622 r = image_path_lock(np, (arg_read_only ? LOCK_SH : LOCK_EX) | LOCK_NB, &tree_global_lock, &tree_local_lock);
3623 if (r < 0) {
3624 log_error_errno(r, "Failed to lock %s: %m", np);
3625 goto finish;
3626 }
3627
3628 r = btrfs_subvol_snapshot(arg_directory, np,
3629 (arg_read_only ? BTRFS_SNAPSHOT_READ_ONLY : 0) |
3630 BTRFS_SNAPSHOT_FALLBACK_COPY |
3631 BTRFS_SNAPSHOT_FALLBACK_DIRECTORY |
3632 BTRFS_SNAPSHOT_RECURSIVE |
3633 BTRFS_SNAPSHOT_QUOTA);
3634 if (r < 0) {
3635 log_error_errno(r, "Failed to create snapshot %s from %s: %m", np, arg_directory);
3636 goto finish;
3637 }
3638
3639 free(arg_directory);
3640 arg_directory = np;
3641 np = NULL;
3642
3643 remove_directory = true;
3644
3645 } else {
3646 r = chase_symlinks_and_update(&arg_directory, arg_template ? CHASE_NONEXISTENT : 0);
3647 if (r < 0)
3648 goto finish;
3649
3650 r = image_path_lock(arg_directory, (arg_read_only ? LOCK_SH : LOCK_EX) | LOCK_NB, &tree_global_lock, &tree_local_lock);
3651 if (r == -EBUSY) {
3652 log_error_errno(r, "Directory tree %s is currently busy.", arg_directory);
3653 goto finish;
3654 }
3655 if (r < 0) {
3656 log_error_errno(r, "Failed to lock %s: %m", arg_directory);
3657 goto finish;
3658 }
3659
3660 if (arg_template) {
3661 r = chase_symlinks_and_update(&arg_template, 0);
3662 if (r < 0)
3663 goto finish;
3664
3665 r = btrfs_subvol_snapshot(arg_template, arg_directory,
3666 (arg_read_only ? BTRFS_SNAPSHOT_READ_ONLY : 0) |
3667 BTRFS_SNAPSHOT_FALLBACK_COPY |
3668 BTRFS_SNAPSHOT_FALLBACK_DIRECTORY |
3669 BTRFS_SNAPSHOT_FALLBACK_IMMUTABLE |
3670 BTRFS_SNAPSHOT_RECURSIVE |
3671 BTRFS_SNAPSHOT_QUOTA);
3672 if (r == -EEXIST) {
3673 if (!arg_quiet)
3674 log_info("Directory %s already exists, not populating from template %s.", arg_directory, arg_template);
3675 } else if (r < 0) {
3676 log_error_errno(r, "Couldn't create snapshot %s from %s: %m", arg_directory, arg_template);
3677 goto finish;
3678 } else {
3679 if (!arg_quiet)
3680 log_info("Populated %s from template %s.", arg_directory, arg_template);
3681 }
3682 }
3683 }
3684
3685 if (arg_start_mode == START_BOOT) {
3686 if (path_is_os_tree(arg_directory) <= 0) {
3687 log_error("Directory %s doesn't look like an OS root directory (os-release file is missing). Refusing.", arg_directory);
3688 r = -EINVAL;
3689 goto finish;
3690 }
3691 } else {
3692 const char *p;
3693
3694 p = strjoina(arg_directory, "/usr/");
3695 if (laccess(p, F_OK) < 0) {
3696 log_error("Directory %s doesn't look like it has an OS tree. Refusing.", arg_directory);
3697 r = -EINVAL;
3698 goto finish;
3699 }
3700 }
3701
3702 } else {
3703 assert(arg_image);
3704 assert(!arg_template);
3705
3706 r = chase_symlinks_and_update(&arg_image, 0);
3707 if (r < 0)
3708 goto finish;
3709
3710 if (arg_ephemeral) {
3711 _cleanup_free_ char *np = NULL;
3712
3713 r = tempfn_random(arg_image, "machine.", &np);
3714 if (r < 0) {
3715 log_error_errno(r, "Failed to generate name for image snapshot: %m");
3716 goto finish;
3717 }
3718
3719 r = image_path_lock(np, (arg_read_only ? LOCK_SH : LOCK_EX) | LOCK_NB, &tree_global_lock, &tree_local_lock);
3720 if (r < 0) {
3721 r = log_error_errno(r, "Failed to create image lock: %m");
3722 goto finish;
3723 }
3724
3725 r = copy_file(arg_image, np, O_EXCL, arg_read_only ? 0400 : 0600, FS_NOCOW_FL, COPY_REFLINK);
3726 if (r < 0) {
3727 r = log_error_errno(r, "Failed to copy image file: %m");
3728 goto finish;
3729 }
3730
3731 free(arg_image);
3732 arg_image = np;
3733 np = NULL;
3734
3735 remove_image = true;
3736 } else {
3737 r = image_path_lock(arg_image, (arg_read_only ? LOCK_SH : LOCK_EX) | LOCK_NB, &tree_global_lock, &tree_local_lock);
3738 if (r == -EBUSY) {
3739 r = log_error_errno(r, "Disk image %s is currently busy.", arg_image);
3740 goto finish;
3741 }
3742 if (r < 0) {
3743 r = log_error_errno(r, "Failed to create image lock: %m");
3744 goto finish;
3745 }
3746
3747 if (!arg_root_hash) {
3748 r = root_hash_load(arg_image, &arg_root_hash, &arg_root_hash_size);
3749 if (r < 0) {
3750 log_error_errno(r, "Failed to load root hash file for %s: %m", arg_image);
3751 goto finish;
3752 }
3753 }
3754 }
3755
3756 if (!mkdtemp(tmprootdir)) {
3757 r = log_error_errno(errno, "Failed to create temporary directory: %m");
3758 goto finish;
3759 }
3760
3761 remove_tmprootdir = true;
3762
3763 arg_directory = strdup(tmprootdir);
3764 if (!arg_directory) {
3765 r = log_oom();
3766 goto finish;
3767 }
3768
3769 r = loop_device_make_by_path(arg_image, arg_read_only ? O_RDONLY : O_RDWR, &loop);
3770 if (r < 0) {
3771 log_error_errno(r, "Failed to set up loopback block device: %m");
3772 goto finish;
3773 }
3774
3775 r = dissect_image(
3776 loop->fd,
3777 arg_root_hash, arg_root_hash_size,
3778 DISSECT_IMAGE_REQUIRE_ROOT,
3779 &dissected_image);
3780 if (r == -ENOPKG) {
3781 log_error_errno(r, "Could not find a suitable file system or partition table in image: %s", arg_image);
3782
3783 log_notice("Note that the disk image needs to\n"
3784 " a) either contain only a single MBR partition of type 0x83 that is marked bootable\n"
3785 " b) or contain a single GPT partition of type 0FC63DAF-8483-4772-8E79-3D69D8477DE4\n"
3786 " c) or follow http://www.freedesktop.org/wiki/Specifications/DiscoverablePartitionsSpec/\n"
3787 " d) or contain a file system without a partition table\n"
3788 "in order to be bootable with systemd-nspawn.");
3789 goto finish;
3790 }
3791 if (r == -EADDRNOTAVAIL) {
3792 log_error_errno(r, "No root partition for specified root hash found.");
3793 goto finish;
3794 }
3795 if (r == -EOPNOTSUPP) {
3796 log_error_errno(r, "--image= is not supported, compiled without blkid support.");
3797 goto finish;
3798 }
3799 if (r < 0) {
3800 log_error_errno(r, "Failed to dissect image: %m");
3801 goto finish;
3802 }
3803
3804 if (!arg_root_hash && dissected_image->can_verity)
3805 log_notice("Note: image %s contains verity information, but no root hash specified! Proceeding without integrity checking.", arg_image);
3806
3807 r = dissected_image_decrypt_interactively(dissected_image, NULL, arg_root_hash, arg_root_hash_size, 0, &decrypted_image);
3808 if (r < 0)
3809 goto finish;
3810
3811 /* Now that we mounted the image, let's try to remove it again, if it is ephemeral */
3812 if (remove_image && unlink(arg_image) >= 0)
3813 remove_image = false;
3814 }
3815
3816 r = custom_mount_prepare_all(arg_directory, arg_custom_mounts, arg_n_custom_mounts);
3817 if (r < 0)
3818 goto finish;
3819
3820 r = detect_unified_cgroup_hierarchy(arg_directory);
3821 if (r < 0)
3822 goto finish;
3823
3824 interactive =
3825 isatty(STDIN_FILENO) > 0 &&
3826 isatty(STDOUT_FILENO) > 0;
3827
3828 master = posix_openpt(O_RDWR|O_NOCTTY|O_CLOEXEC|O_NDELAY);
3829 if (master < 0) {
3830 r = log_error_errno(errno, "Failed to acquire pseudo tty: %m");
3831 goto finish;
3832 }
3833
3834 r = ptsname_malloc(master, &console);
3835 if (r < 0) {
3836 r = log_error_errno(r, "Failed to determine tty name: %m");
3837 goto finish;
3838 }
3839
3840 if (arg_selinux_apifs_context) {
3841 r = mac_selinux_apply(console, arg_selinux_apifs_context);
3842 if (r < 0)
3843 goto finish;
3844 }
3845
3846 if (unlockpt(master) < 0) {
3847 r = log_error_errno(errno, "Failed to unlock tty: %m");
3848 goto finish;
3849 }
3850
3851 if (!arg_quiet)
3852 log_info("Spawning container %s on %s.\nPress ^] three times within 1s to kill container.",
3853 arg_machine, arg_image ?: arg_directory);
3854
3855 assert_se(sigprocmask_many(SIG_BLOCK, NULL, SIGCHLD, SIGWINCH, SIGTERM, SIGINT, -1) >= 0);
3856
3857 if (prctl(PR_SET_CHILD_SUBREAPER, 1) < 0) {
3858 r = log_error_errno(errno, "Failed to become subreaper: %m");
3859 goto finish;
3860 }
3861
3862 for (;;) {
3863 r = run(master,
3864 console,
3865 dissected_image,
3866 interactive, secondary,
3867 fds,
3868 veth_name, &veth_created,
3869 &exposed,
3870 &pid, &ret);
3871 if (r <= 0)
3872 break;
3873 }
3874
3875 finish:
3876 sd_notify(false,
3877 r == 0 && ret == EXIT_FORCE_RESTART ? "STOPPING=1\nSTATUS=Restarting..." :
3878 "STOPPING=1\nSTATUS=Terminating...");
3879
3880 if (pid > 0)
3881 (void) kill(pid, SIGKILL);
3882
3883 /* Try to flush whatever is still queued in the pty */
3884 if (master >= 0) {
3885 (void) copy_bytes(master, STDOUT_FILENO, (uint64_t) -1, 0);
3886 master = safe_close(master);
3887 }
3888
3889 if (pid > 0)
3890 (void) wait_for_terminate(pid, NULL);
3891
3892 if (remove_directory && arg_directory) {
3893 int k;
3894
3895 k = rm_rf(arg_directory, REMOVE_ROOT|REMOVE_PHYSICAL|REMOVE_SUBVOLUME);
3896 if (k < 0)
3897 log_warning_errno(k, "Cannot remove '%s', ignoring: %m", arg_directory);
3898 }
3899
3900 if (remove_image && arg_image) {
3901 if (unlink(arg_image) < 0)
3902 log_warning_errno(errno, "Can't remove image file '%s', ignoring: %m", arg_image);
3903 }
3904
3905 if (remove_tmprootdir) {
3906 if (rmdir(tmprootdir) < 0)
3907 log_debug_errno(errno, "Can't remove temporary root directory '%s', ignoring: %m", tmprootdir);
3908 }
3909
3910 if (arg_machine) {
3911 const char *p;
3912
3913 p = strjoina("/run/systemd/nspawn/propagate/", arg_machine);
3914 (void) rm_rf(p, REMOVE_ROOT);
3915 }
3916
3917 expose_port_flush(arg_expose_ports, &exposed);
3918
3919 if (veth_created)
3920 (void) remove_veth_links(veth_name, arg_network_veth_extra);
3921 (void) remove_bridge(arg_network_zone);
3922
3923 free(arg_directory);
3924 free(arg_template);
3925 free(arg_image);
3926 free(arg_machine);
3927 free(arg_user);
3928 free(arg_pivot_root_new);
3929 free(arg_pivot_root_old);
3930 free(arg_chdir);
3931 strv_free(arg_setenv);
3932 free(arg_network_bridge);
3933 strv_free(arg_network_interfaces);
3934 strv_free(arg_network_macvlan);
3935 strv_free(arg_network_ipvlan);
3936 strv_free(arg_network_veth_extra);
3937 strv_free(arg_parameters);
3938 custom_mount_free_all(arg_custom_mounts, arg_n_custom_mounts);
3939 expose_port_free_all(arg_expose_ports);
3940 free(arg_root_hash);
3941
3942 return r < 0 ? EXIT_FAILURE : ret;
3943 }
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