1 /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
4 This file is part of systemd.
6 Copyright 2010 Lennart Poettering
8 systemd is free software; you can redistribute it and/or modify it
9 under the terms of the GNU Lesser General Public License as published by
10 the Free Software Foundation; either version 2.1 of the License, or
11 (at your option) any later version.
13 systemd is distributed in the hope that it will be useful, but
14 WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 Lesser General Public License for more details.
18 You should have received a copy of the GNU Lesser General Public License
19 along with systemd; If not, see <http://www.gnu.org/licenses/>.
25 #include <sys/types.h>
26 #include <sys/syscall.h>
27 #include <sys/mount.h>
33 #include <sys/prctl.h>
34 #include <sys/capability.h>
37 #include <sys/signalfd.h>
41 #include <sys/socket.h>
42 #include <linux/netlink.h>
44 #include <linux/veth.h>
45 #include <sys/personality.h>
46 #include <linux/loop.h>
49 #include <selinux/selinux.h>
57 #include <blkid/blkid.h>
60 #include "sd-daemon.h"
70 #include "cgroup-util.h"
72 #include "path-util.h"
73 #include "loopback-setup.h"
74 #include "dev-setup.h"
79 #include "bus-error.h"
81 #include "bus-kernel.h"
84 #include "rtnl-util.h"
85 #include "udev-util.h"
86 #include "blkid-util.h"
88 #include "siphash24.h"
90 #include "base-filesystem.h"
94 #include "seccomp-util.h"
97 typedef enum ContainerStatus {
102 typedef enum LinkJournal {
109 typedef enum Volatile {
115 static char *arg_directory = NULL;
116 static char *arg_user = NULL;
117 static sd_id128_t arg_uuid = {};
118 static char *arg_machine = NULL;
119 static const char *arg_selinux_context = NULL;
120 static const char *arg_selinux_apifs_context = NULL;
121 static const char *arg_slice = NULL;
122 static bool arg_private_network = false;
123 static bool arg_read_only = false;
124 static bool arg_boot = false;
125 static LinkJournal arg_link_journal = LINK_AUTO;
126 static uint64_t arg_retain =
127 (1ULL << CAP_CHOWN) |
128 (1ULL << CAP_DAC_OVERRIDE) |
129 (1ULL << CAP_DAC_READ_SEARCH) |
130 (1ULL << CAP_FOWNER) |
131 (1ULL << CAP_FSETID) |
132 (1ULL << CAP_IPC_OWNER) |
134 (1ULL << CAP_LEASE) |
135 (1ULL << CAP_LINUX_IMMUTABLE) |
136 (1ULL << CAP_NET_BIND_SERVICE) |
137 (1ULL << CAP_NET_BROADCAST) |
138 (1ULL << CAP_NET_RAW) |
139 (1ULL << CAP_SETGID) |
140 (1ULL << CAP_SETFCAP) |
141 (1ULL << CAP_SETPCAP) |
142 (1ULL << CAP_SETUID) |
143 (1ULL << CAP_SYS_ADMIN) |
144 (1ULL << CAP_SYS_CHROOT) |
145 (1ULL << CAP_SYS_NICE) |
146 (1ULL << CAP_SYS_PTRACE) |
147 (1ULL << CAP_SYS_TTY_CONFIG) |
148 (1ULL << CAP_SYS_RESOURCE) |
149 (1ULL << CAP_SYS_BOOT) |
150 (1ULL << CAP_AUDIT_WRITE) |
151 (1ULL << CAP_AUDIT_CONTROL) |
153 static char **arg_bind = NULL;
154 static char **arg_bind_ro = NULL;
155 static char **arg_tmpfs = NULL;
156 static char **arg_setenv = NULL;
157 static bool arg_quiet = false;
158 static bool arg_share_system = false;
159 static bool arg_register = true;
160 static bool arg_keep_unit = false;
161 static char **arg_network_interfaces = NULL;
162 static char **arg_network_macvlan = NULL;
163 static bool arg_network_veth = false;
164 static const char *arg_network_bridge = NULL;
165 static unsigned long arg_personality = 0xffffffffLU;
166 static const char *arg_image = NULL;
167 static Volatile arg_volatile = VOLATILE_NO;
169 static void help(void) {
170 printf("%s [OPTIONS...] [PATH] [ARGUMENTS...]\n\n"
171 "Spawn a minimal namespace container for debugging, testing and building.\n\n"
172 " -h --help Show this help\n"
173 " --version Print version string\n"
174 " -q --quiet Do not show status information\n"
175 " -D --directory=PATH Root directory for the container\n"
176 " -i --image=PATH File system device or image for the container\n"
177 " -b --boot Boot up full system (i.e. invoke init)\n"
178 " -u --user=USER Run the command under specified user or uid\n"
179 " -M --machine=NAME Set the machine name for the container\n"
180 " --uuid=UUID Set a specific machine UUID for the container\n"
181 " -S --slice=SLICE Place the container in the specified slice\n"
182 " --private-network Disable network in container\n"
183 " --network-interface=INTERFACE\n"
184 " Assign an existing network interface to the\n"
186 " --network-macvlan=INTERFACE\n"
187 " Create a macvlan network interface based on an\n"
188 " existing network interface to the container\n"
189 " --network-veth Add a virtual ethernet connection between host\n"
191 " --network-bridge=INTERFACE\n"
192 " Add a virtual ethernet connection between host\n"
193 " and container and add it to an existing bridge on\n"
195 " -Z --selinux-context=SECLABEL\n"
196 " Set the SELinux security context to be used by\n"
197 " processes in the container\n"
198 " -L --selinux-apifs-context=SECLABEL\n"
199 " Set the SELinux security context to be used by\n"
200 " API/tmpfs file systems in the container\n"
201 " --capability=CAP In addition to the default, retain specified\n"
203 " --drop-capability=CAP Drop the specified capability from the default set\n"
204 " --link-journal=MODE Link up guest journal, one of no, auto, guest, host\n"
205 " -j Equivalent to --link-journal=host\n"
206 " --read-only Mount the root directory read-only\n"
207 " --bind=PATH[:PATH] Bind mount a file or directory from the host into\n"
209 " --bind-ro=PATH[:PATH] Similar, but creates a read-only bind mount\n"
210 " --tmpfs=PATH:[OPTIONS] Mount an empty tmpfs to the specified directory\n"
211 " --setenv=NAME=VALUE Pass an environment variable to PID 1\n"
212 " --share-system Share system namespaces with host\n"
213 " --register=BOOLEAN Register container as machine\n"
214 " --keep-unit Do not register a scope for the machine, reuse\n"
215 " the service unit nspawn is running in\n"
216 " --volatile[=MODE] Run the system in volatile mode\n",
217 program_invocation_short_name);
220 static int parse_argv(int argc, char *argv[]) {
237 ARG_NETWORK_INTERFACE,
245 static const struct option options[] = {
246 { "help", no_argument, NULL, 'h' },
247 { "version", no_argument, NULL, ARG_VERSION },
248 { "directory", required_argument, NULL, 'D' },
249 { "user", required_argument, NULL, 'u' },
250 { "private-network", no_argument, NULL, ARG_PRIVATE_NETWORK },
251 { "boot", no_argument, NULL, 'b' },
252 { "uuid", required_argument, NULL, ARG_UUID },
253 { "read-only", no_argument, NULL, ARG_READ_ONLY },
254 { "capability", required_argument, NULL, ARG_CAPABILITY },
255 { "drop-capability", required_argument, NULL, ARG_DROP_CAPABILITY },
256 { "link-journal", required_argument, NULL, ARG_LINK_JOURNAL },
257 { "bind", required_argument, NULL, ARG_BIND },
258 { "bind-ro", required_argument, NULL, ARG_BIND_RO },
259 { "tmpfs", required_argument, NULL, ARG_TMPFS },
260 { "machine", required_argument, NULL, 'M' },
261 { "slice", required_argument, NULL, 'S' },
262 { "setenv", required_argument, NULL, ARG_SETENV },
263 { "selinux-context", required_argument, NULL, 'Z' },
264 { "selinux-apifs-context", required_argument, NULL, 'L' },
265 { "quiet", no_argument, NULL, 'q' },
266 { "share-system", no_argument, NULL, ARG_SHARE_SYSTEM },
267 { "register", required_argument, NULL, ARG_REGISTER },
268 { "keep-unit", no_argument, NULL, ARG_KEEP_UNIT },
269 { "network-interface", required_argument, NULL, ARG_NETWORK_INTERFACE },
270 { "network-macvlan", required_argument, NULL, ARG_NETWORK_MACVLAN },
271 { "network-veth", no_argument, NULL, ARG_NETWORK_VETH },
272 { "network-bridge", required_argument, NULL, ARG_NETWORK_BRIDGE },
273 { "personality", required_argument, NULL, ARG_PERSONALITY },
274 { "image", required_argument, NULL, 'i' },
275 { "volatile", optional_argument, NULL, ARG_VOLATILE },
280 uint64_t plus = 0, minus = 0;
285 while ((c = getopt_long(argc, argv, "+hD:u:bL:M:jS:Z:qi:", options, NULL)) >= 0)
294 puts(PACKAGE_STRING);
295 puts(SYSTEMD_FEATURES);
300 arg_directory = canonicalize_file_name(optarg);
301 if (!arg_directory) {
302 log_error("Invalid root directory: %m");
314 arg_user = strdup(optarg);
320 case ARG_NETWORK_BRIDGE:
321 arg_network_bridge = optarg;
325 case ARG_NETWORK_VETH:
326 arg_network_veth = true;
327 arg_private_network = true;
330 case ARG_NETWORK_INTERFACE:
331 if (strv_extend(&arg_network_interfaces, optarg) < 0)
334 arg_private_network = true;
337 case ARG_NETWORK_MACVLAN:
338 if (strv_extend(&arg_network_macvlan, optarg) < 0)
343 case ARG_PRIVATE_NETWORK:
344 arg_private_network = true;
352 r = sd_id128_from_string(optarg, &arg_uuid);
354 log_error("Invalid UUID: %s", optarg);
364 if (isempty(optarg)) {
369 if (!hostname_is_valid(optarg)) {
370 log_error("Invalid machine name: %s", optarg);
375 arg_machine = strdup(optarg);
383 arg_selinux_context = optarg;
387 arg_selinux_apifs_context = optarg;
391 arg_read_only = true;
395 case ARG_DROP_CAPABILITY: {
396 const char *state, *word;
399 FOREACH_WORD_SEPARATOR(word, length, optarg, ",", state) {
400 _cleanup_free_ char *t;
403 t = strndup(word, length);
407 if (streq(t, "all")) {
408 if (c == ARG_CAPABILITY)
409 plus = (uint64_t) -1;
411 minus = (uint64_t) -1;
413 if (cap_from_name(t, &cap) < 0) {
414 log_error("Failed to parse capability %s.", t);
418 if (c == ARG_CAPABILITY)
419 plus |= 1ULL << (uint64_t) cap;
421 minus |= 1ULL << (uint64_t) cap;
429 arg_link_journal = LINK_GUEST;
432 case ARG_LINK_JOURNAL:
433 if (streq(optarg, "auto"))
434 arg_link_journal = LINK_AUTO;
435 else if (streq(optarg, "no"))
436 arg_link_journal = LINK_NO;
437 else if (streq(optarg, "guest"))
438 arg_link_journal = LINK_GUEST;
439 else if (streq(optarg, "host"))
440 arg_link_journal = LINK_HOST;
442 log_error("Failed to parse link journal mode %s", optarg);
450 _cleanup_free_ char *a = NULL, *b = NULL;
454 x = c == ARG_BIND ? &arg_bind : &arg_bind_ro;
456 e = strchr(optarg, ':');
458 a = strndup(optarg, e - optarg);
468 if (!path_is_absolute(a) || !path_is_absolute(b)) {
469 log_error("Invalid bind mount specification: %s", optarg);
473 r = strv_extend(x, a);
477 r = strv_extend(x, b);
485 _cleanup_free_ char *a = NULL, *b = NULL;
488 e = strchr(optarg, ':');
490 a = strndup(optarg, e - optarg);
494 b = strdup("mode=0755");
500 if (!path_is_absolute(a)) {
501 log_error("Invalid tmpfs specification: %s", optarg);
505 r = strv_push(&arg_tmpfs, a);
511 r = strv_push(&arg_tmpfs, b);
523 if (!env_assignment_is_valid(optarg)) {
524 log_error("Environment variable assignment '%s' is not valid.", optarg);
528 n = strv_env_set(arg_setenv, optarg);
532 strv_free(arg_setenv);
541 case ARG_SHARE_SYSTEM:
542 arg_share_system = true;
546 r = parse_boolean(optarg);
548 log_error("Failed to parse --register= argument: %s", optarg);
556 arg_keep_unit = true;
559 case ARG_PERSONALITY:
561 arg_personality = personality_from_string(optarg);
562 if (arg_personality == 0xffffffffLU) {
563 log_error("Unknown or unsupported personality '%s'.", optarg);
572 arg_volatile = VOLATILE_YES;
574 r = parse_boolean(optarg);
576 if (streq(optarg, "state"))
577 arg_volatile = VOLATILE_STATE;
579 log_error("Failed to parse --volatile= argument: %s", optarg);
583 arg_volatile = r ? VOLATILE_YES : VOLATILE_NO;
592 assert_not_reached("Unhandled option");
595 if (arg_share_system)
596 arg_register = false;
598 if (arg_boot && arg_share_system) {
599 log_error("--boot and --share-system may not be combined.");
603 if (arg_keep_unit && cg_pid_get_owner_uid(0, NULL) >= 0) {
604 log_error("--keep-unit may not be used when invoked from a user session.");
608 if (arg_directory && arg_image) {
609 log_error("--directory= and --image= may not be combined.");
613 if (arg_volatile != VOLATILE_NO && arg_read_only) {
614 log_error("Cannot combine --read-only with --volatile. Note that --volatile already implies a read-only base hierarchy.");
618 arg_retain = (arg_retain | plus | (arg_private_network ? 1ULL << CAP_NET_ADMIN : 0)) & ~minus;
623 static int mount_all(const char *dest) {
625 typedef struct MountPoint {
634 static const MountPoint mount_table[] = {
635 { "proc", "/proc", "proc", NULL, MS_NOSUID|MS_NOEXEC|MS_NODEV, true },
636 { "/proc/sys", "/proc/sys", NULL, NULL, MS_BIND, true }, /* Bind mount first */
637 { NULL, "/proc/sys", NULL, NULL, MS_BIND|MS_RDONLY|MS_REMOUNT, true }, /* Then, make it r/o */
638 { "sysfs", "/sys", "sysfs", NULL, MS_RDONLY|MS_NOSUID|MS_NOEXEC|MS_NODEV, true },
639 { "tmpfs", "/dev", "tmpfs", "mode=755", MS_NOSUID|MS_STRICTATIME, true },
640 { "devpts", "/dev/pts", "devpts","newinstance,ptmxmode=0666,mode=620,gid=" STRINGIFY(TTY_GID), MS_NOSUID|MS_NOEXEC, true },
641 { "tmpfs", "/dev/shm", "tmpfs", "mode=1777", MS_NOSUID|MS_NODEV|MS_STRICTATIME, true },
642 { "tmpfs", "/run", "tmpfs", "mode=755", MS_NOSUID|MS_NODEV|MS_STRICTATIME, true },
644 { "/sys/fs/selinux", "/sys/fs/selinux", NULL, NULL, MS_BIND, false }, /* Bind mount first */
645 { NULL, "/sys/fs/selinux", NULL, NULL, MS_BIND|MS_RDONLY|MS_REMOUNT, false }, /* Then, make it r/o */
652 for (k = 0; k < ELEMENTSOF(mount_table); k++) {
653 _cleanup_free_ char *where = NULL;
655 _cleanup_free_ char *options = NULL;
660 where = strjoin(dest, "/", mount_table[k].where, NULL);
664 t = path_is_mount_point(where, true);
666 log_error("Failed to detect whether %s is a mount point: %s", where, strerror(-t));
674 /* Skip this entry if it is not a remount. */
675 if (mount_table[k].what && t > 0)
678 t = mkdir_p(where, 0755);
680 if (mount_table[k].fatal) {
681 log_error("Failed to create directory %s: %s", where, strerror(-t));
686 log_warning("Failed to create directory %s: %s", where, strerror(-t));
692 if (arg_selinux_apifs_context &&
693 (streq_ptr(mount_table[k].what, "tmpfs") || streq_ptr(mount_table[k].what, "devpts"))) {
694 options = strjoin(mount_table[k].options, ",context=\"", arg_selinux_apifs_context, "\"", NULL);
701 o = mount_table[k].options;
704 if (mount(mount_table[k].what,
707 mount_table[k].flags,
710 if (mount_table[k].fatal) {
711 log_error("mount(%s) failed: %m", where);
716 log_warning("mount(%s) failed: %m", where);
723 static int mount_binds(const char *dest, char **l, bool ro) {
726 STRV_FOREACH_PAIR(x, y, l) {
727 _cleanup_free_ char *where = NULL;
728 struct stat source_st, dest_st;
731 if (stat(*x, &source_st) < 0) {
732 log_error("Failed to stat %s: %m", *x);
736 where = strappend(dest, *y);
740 r = stat(where, &dest_st);
742 if ((source_st.st_mode & S_IFMT) != (dest_st.st_mode & S_IFMT)) {
743 log_error("The file types of %s and %s do not match. Refusing bind mount", *x, where);
746 } else if (errno == ENOENT) {
747 r = mkdir_parents_label(where, 0755);
749 log_error("Failed to bind mount %s: %s", *x, strerror(-r));
753 log_error("Failed to bind mount %s: %m", *x);
757 /* Create the mount point, but be conservative -- refuse to create block
758 * and char devices. */
759 if (S_ISDIR(source_st.st_mode)) {
760 r = mkdir_label(where, 0755);
762 log_error("Failed to create mount point %s: %s", where, strerror(-r));
766 } else if (S_ISFIFO(source_st.st_mode)) {
767 r = mkfifo(where, 0644);
768 if (r < 0 && errno != EEXIST) {
769 log_error("Failed to create mount point %s: %m", where);
773 } else if (S_ISSOCK(source_st.st_mode)) {
774 r = mknod(where, 0644 | S_IFSOCK, 0);
775 if (r < 0 && errno != EEXIST) {
776 log_error("Failed to create mount point %s: %m", where);
780 } else if (S_ISREG(source_st.st_mode)) {
783 log_error("Failed to create mount point %s: %s", where, strerror(-r));
788 log_error("Refusing to create mountpoint for file: %s", *x);
792 if (mount(*x, where, "bind", MS_BIND, NULL) < 0) {
793 log_error("mount(%s) failed: %m", where);
798 r = bind_remount_recursive(where, true);
800 log_error("Read-Only bind mount failed: %s", strerror(-r));
809 static int mount_tmpfs(const char *dest) {
812 STRV_FOREACH_PAIR(i, o, arg_tmpfs) {
813 _cleanup_free_ char *where = NULL;
816 where = strappend(dest, *i);
820 r = mkdir_label(where, 0755);
822 log_error("creating mount point for tmpfs %s failed: %s", where, strerror(-r));
827 if (mount("tmpfs", where, "tmpfs", MS_NODEV|MS_STRICTATIME, *o) < 0) {
828 log_error("tmpfs mount to %s failed: %m", where);
836 static int setup_timezone(const char *dest) {
837 _cleanup_free_ char *where = NULL, *p = NULL, *q = NULL, *check = NULL, *what = NULL;
843 /* Fix the timezone, if possible */
844 r = readlink_malloc("/etc/localtime", &p);
846 log_warning("/etc/localtime is not a symlink, not updating container timezone.");
850 z = path_startswith(p, "../usr/share/zoneinfo/");
852 z = path_startswith(p, "/usr/share/zoneinfo/");
854 log_warning("/etc/localtime does not point into /usr/share/zoneinfo/, not updating container timezone.");
858 where = strappend(dest, "/etc/localtime");
862 r = readlink_malloc(where, &q);
864 y = path_startswith(q, "../usr/share/zoneinfo/");
866 y = path_startswith(q, "/usr/share/zoneinfo/");
868 /* Already pointing to the right place? Then do nothing .. */
869 if (y && streq(y, z))
873 check = strjoin(dest, "/usr/share/zoneinfo/", z, NULL);
877 if (access(check, F_OK) < 0) {
878 log_warning("Timezone %s does not exist in container, not updating container timezone.", z);
882 what = strappend("../usr/share/zoneinfo/", z);
886 r = mkdir_parents(where, 0755);
888 log_error("Failed to create directory for timezone info %s in container: %s", where, strerror(-r));
894 if (r < 0 && errno != ENOENT) {
895 log_error("Failed to remove existing timezone info %s in container: %m", where);
900 if (symlink(what, where) < 0) {
901 log_error("Failed to correct timezone of container: %m");
908 static int setup_resolv_conf(const char *dest) {
909 _cleanup_free_ char *where = NULL;
914 if (arg_private_network)
917 /* Fix resolv.conf, if possible */
918 where = strappend(dest, "/etc/resolv.conf");
922 /* We don't really care for the results of this really. If it
923 * fails, it fails, but meh... */
924 r = mkdir_parents(where, 0755);
926 log_warning("Failed to create parent directory for resolv.conf %s: %s", where, strerror(-r));
931 r = copy_file("/etc/resolv.conf", where, O_TRUNC|O_NOFOLLOW, 0644);
933 log_warning("Failed to copy /etc/resolv.conf to %s: %s", where, strerror(-r));
941 static int setup_volatile_state(const char *directory) {
947 if (arg_volatile != VOLATILE_STATE)
950 /* --volatile=state means we simply overmount /var
951 with a tmpfs, and the rest read-only. */
953 r = bind_remount_recursive(directory, true);
955 log_error("Failed to remount %s read-only: %s", directory, strerror(-r));
959 p = strappenda(directory, "/var");
961 if (r < 0 && errno != EEXIST) {
962 log_error("Failed to create %s: %m", directory);
966 if (mount("tmpfs", p, "tmpfs", MS_STRICTATIME, "mode=755") < 0) {
967 log_error("Failed to mount tmpfs to /var: %m");
974 static int setup_volatile(const char *directory) {
975 bool tmpfs_mounted = false, bind_mounted = false;
976 char template[] = "/tmp/nspawn-volatile-XXXXXX";
982 if (arg_volatile != VOLATILE_YES)
985 /* --volatile=yes means we mount a tmpfs to the root dir, and
986 the original /usr to use inside it, and that read-only. */
988 if (!mkdtemp(template)) {
989 log_error("Failed to create temporary directory: %m");
993 if (mount("tmpfs", template, "tmpfs", MS_STRICTATIME, "mode=755") < 0) {
994 log_error("Failed to mount tmpfs for root directory: %m");
999 tmpfs_mounted = true;
1001 f = strappenda(directory, "/usr");
1002 t = strappenda(template, "/usr");
1005 if (r < 0 && errno != EEXIST) {
1006 log_error("Failed to create %s: %m", t);
1011 if (mount(f, t, "bind", MS_BIND|MS_REC, NULL) < 0) {
1012 log_error("Failed to create /usr bind mount: %m");
1017 bind_mounted = true;
1019 r = bind_remount_recursive(t, true);
1021 log_error("Failed to remount %s read-only: %s", t, strerror(-r));
1025 if (mount(template, directory, NULL, MS_MOVE, NULL) < 0) {
1026 log_error("Failed to move root mount: %m");
1044 static char* id128_format_as_uuid(sd_id128_t id, char s[37]) {
1047 "%02x%02x%02x%02x-%02x%02x-%02x%02x-%02x%02x-%02x%02x%02x%02x%02x%02x",
1048 SD_ID128_FORMAT_VAL(id));
1053 static int setup_boot_id(const char *dest) {
1054 _cleanup_free_ char *from = NULL, *to = NULL;
1055 sd_id128_t rnd = {};
1061 if (arg_share_system)
1064 /* Generate a new randomized boot ID, so that each boot-up of
1065 * the container gets a new one */
1067 from = strappend(dest, "/dev/proc-sys-kernel-random-boot-id");
1068 to = strappend(dest, "/proc/sys/kernel/random/boot_id");
1072 r = sd_id128_randomize(&rnd);
1074 log_error("Failed to generate random boot id: %s", strerror(-r));
1078 id128_format_as_uuid(rnd, as_uuid);
1080 r = write_string_file(from, as_uuid);
1082 log_error("Failed to write boot id: %s", strerror(-r));
1086 if (mount(from, to, "bind", MS_BIND, NULL) < 0) {
1087 log_error("Failed to bind mount boot id: %m");
1089 } else if (mount(from, to, "bind", MS_BIND|MS_REMOUNT|MS_RDONLY, NULL))
1090 log_warning("Failed to make boot id read-only: %m");
1096 static int copy_devnodes(const char *dest) {
1098 static const char devnodes[] =
1109 _cleanup_umask_ mode_t u;
1115 NULSTR_FOREACH(d, devnodes) {
1116 _cleanup_free_ char *from = NULL, *to = NULL;
1119 from = strappend("/dev/", d);
1120 to = strjoin(dest, "/dev/", d, NULL);
1124 if (stat(from, &st) < 0) {
1126 if (errno != ENOENT) {
1127 log_error("Failed to stat %s: %m", from);
1131 } else if (!S_ISCHR(st.st_mode) && !S_ISBLK(st.st_mode)) {
1133 log_error("%s is not a char or block device, cannot copy", from);
1137 r = mkdir_parents(to, 0775);
1139 log_error("Failed to create parent directory of %s: %s", to, strerror(-r));
1143 if (mknod(to, st.st_mode, st.st_rdev) < 0) {
1144 log_error("mknod(%s) failed: %m", dest);
1153 static int setup_ptmx(const char *dest) {
1154 _cleanup_free_ char *p = NULL;
1156 p = strappend(dest, "/dev/ptmx");
1160 if (symlink("pts/ptmx", p) < 0) {
1161 log_error("Failed to create /dev/ptmx symlink: %m");
1168 static int setup_dev_console(const char *dest, const char *console) {
1169 _cleanup_umask_ mode_t u;
1179 if (stat("/dev/null", &st) < 0) {
1180 log_error("Failed to stat /dev/null: %m");
1184 r = chmod_and_chown(console, 0600, 0, 0);
1186 log_error("Failed to correct access mode for TTY: %s", strerror(-r));
1190 /* We need to bind mount the right tty to /dev/console since
1191 * ptys can only exist on pts file systems. To have something
1192 * to bind mount things on we create a device node first, and
1193 * use /dev/null for that since we the cgroups device policy
1194 * allows us to create that freely, while we cannot create
1195 * /dev/console. (Note that the major minor doesn't actually
1196 * matter here, since we mount it over anyway). */
1198 to = strappenda(dest, "/dev/console");
1199 if (mknod(to, (st.st_mode & ~07777) | 0600, st.st_rdev) < 0) {
1200 log_error("mknod() for /dev/console failed: %m");
1204 if (mount(console, to, "bind", MS_BIND, NULL) < 0) {
1205 log_error("Bind mount for /dev/console failed: %m");
1212 static int setup_kmsg(const char *dest, int kmsg_socket) {
1213 _cleanup_free_ char *from = NULL, *to = NULL;
1215 _cleanup_umask_ mode_t u;
1217 struct cmsghdr cmsghdr;
1218 uint8_t buf[CMSG_SPACE(sizeof(int))];
1220 struct msghdr mh = {
1221 .msg_control = &control,
1222 .msg_controllen = sizeof(control),
1224 struct cmsghdr *cmsg;
1227 assert(kmsg_socket >= 0);
1231 /* We create the kmsg FIFO as /dev/kmsg, but immediately
1232 * delete it after bind mounting it to /proc/kmsg. While FIFOs
1233 * on the reading side behave very similar to /proc/kmsg,
1234 * their writing side behaves differently from /dev/kmsg in
1235 * that writing blocks when nothing is reading. In order to
1236 * avoid any problems with containers deadlocking due to this
1237 * we simply make /dev/kmsg unavailable to the container. */
1238 if (asprintf(&from, "%s/dev/kmsg", dest) < 0 ||
1239 asprintf(&to, "%s/proc/kmsg", dest) < 0)
1242 if (mkfifo(from, 0600) < 0) {
1243 log_error("mkfifo() for /dev/kmsg failed: %m");
1247 r = chmod_and_chown(from, 0600, 0, 0);
1249 log_error("Failed to correct access mode for /dev/kmsg: %s", strerror(-r));
1253 if (mount(from, to, "bind", MS_BIND, NULL) < 0) {
1254 log_error("Bind mount for /proc/kmsg failed: %m");
1258 fd = open(from, O_RDWR|O_NDELAY|O_CLOEXEC);
1260 log_error("Failed to open fifo: %m");
1264 cmsg = CMSG_FIRSTHDR(&mh);
1265 cmsg->cmsg_level = SOL_SOCKET;
1266 cmsg->cmsg_type = SCM_RIGHTS;
1267 cmsg->cmsg_len = CMSG_LEN(sizeof(int));
1268 memcpy(CMSG_DATA(cmsg), &fd, sizeof(int));
1270 mh.msg_controllen = cmsg->cmsg_len;
1272 /* Store away the fd in the socket, so that it stays open as
1273 * long as we run the child */
1274 k = sendmsg(kmsg_socket, &mh, MSG_DONTWAIT|MSG_NOSIGNAL);
1278 log_error("Failed to send FIFO fd: %m");
1282 /* And now make the FIFO unavailable as /dev/kmsg... */
1287 static int setup_hostname(void) {
1289 if (arg_share_system)
1292 if (sethostname(arg_machine, strlen(arg_machine)) < 0)
1298 static int setup_journal(const char *directory) {
1299 sd_id128_t machine_id, this_id;
1300 _cleanup_free_ char *p = NULL, *b = NULL, *q = NULL, *d = NULL;
1304 p = strappend(directory, "/etc/machine-id");
1308 r = read_one_line_file(p, &b);
1309 if (r == -ENOENT && arg_link_journal == LINK_AUTO)
1312 log_error("Failed to read machine ID from %s: %s", p, strerror(-r));
1317 if (isempty(id) && arg_link_journal == LINK_AUTO)
1320 /* Verify validity */
1321 r = sd_id128_from_string(id, &machine_id);
1323 log_error("Failed to parse machine ID from %s: %s", p, strerror(-r));
1327 r = sd_id128_get_machine(&this_id);
1329 log_error("Failed to retrieve machine ID: %s", strerror(-r));
1333 if (sd_id128_equal(machine_id, this_id)) {
1334 log_full(arg_link_journal == LINK_AUTO ? LOG_WARNING : LOG_ERR,
1335 "Host and machine ids are equal (%s): refusing to link journals", id);
1336 if (arg_link_journal == LINK_AUTO)
1342 if (arg_link_journal == LINK_NO)
1346 p = strappend("/var/log/journal/", id);
1347 q = strjoin(directory, "/var/log/journal/", id, NULL);
1351 if (path_is_mount_point(p, false) > 0) {
1352 if (arg_link_journal != LINK_AUTO) {
1353 log_error("%s: already a mount point, refusing to use for journal", p);
1360 if (path_is_mount_point(q, false) > 0) {
1361 if (arg_link_journal != LINK_AUTO) {
1362 log_error("%s: already a mount point, refusing to use for journal", q);
1369 r = readlink_and_make_absolute(p, &d);
1371 if ((arg_link_journal == LINK_GUEST ||
1372 arg_link_journal == LINK_AUTO) &&
1375 r = mkdir_p(q, 0755);
1377 log_warning("Failed to create directory %s: %m", q);
1381 if (unlink(p) < 0) {
1382 log_error("Failed to remove symlink %s: %m", p);
1385 } else if (r == -EINVAL) {
1387 if (arg_link_journal == LINK_GUEST &&
1390 if (errno == ENOTDIR) {
1391 log_error("%s already exists and is neither a symlink nor a directory", p);
1394 log_error("Failed to remove %s: %m", p);
1398 } else if (r != -ENOENT) {
1399 log_error("readlink(%s) failed: %m", p);
1403 if (arg_link_journal == LINK_GUEST) {
1405 if (symlink(q, p) < 0) {
1406 log_error("Failed to symlink %s to %s: %m", q, p);
1410 r = mkdir_p(q, 0755);
1412 log_warning("Failed to create directory %s: %m", q);
1416 if (arg_link_journal == LINK_HOST) {
1417 r = mkdir_p(p, 0755);
1419 log_error("Failed to create %s: %m", p);
1423 } else if (access(p, F_OK) < 0)
1426 if (dir_is_empty(q) == 0)
1427 log_warning("%s is not empty, proceeding anyway.", q);
1429 r = mkdir_p(q, 0755);
1431 log_error("Failed to create %s: %m", q);
1435 if (mount(p, q, "bind", MS_BIND, NULL) < 0) {
1436 log_error("Failed to bind mount journal from host into guest: %m");
1443 static int setup_kdbus(const char *dest, const char *path) {
1449 p = strappenda(dest, "/dev/kdbus");
1450 if (mkdir(p, 0755) < 0) {
1451 log_error("Failed to create kdbus path: %m");
1455 if (mount(path, p, "bind", MS_BIND, NULL) < 0) {
1456 log_error("Failed to mount kdbus domain path: %m");
1463 static int drop_capabilities(void) {
1464 return capability_bounding_set_drop(~arg_retain, false);
1467 static int register_machine(pid_t pid, int local_ifindex) {
1468 _cleanup_bus_error_free_ sd_bus_error error = SD_BUS_ERROR_NULL;
1469 _cleanup_bus_close_unref_ sd_bus *bus = NULL;
1475 r = sd_bus_default_system(&bus);
1477 log_error("Failed to open system bus: %s", strerror(-r));
1481 if (arg_keep_unit) {
1482 r = sd_bus_call_method(
1484 "org.freedesktop.machine1",
1485 "/org/freedesktop/machine1",
1486 "org.freedesktop.machine1.Manager",
1487 "RegisterMachineWithNetwork",
1492 SD_BUS_MESSAGE_APPEND_ID128(arg_uuid),
1496 strempty(arg_directory),
1497 local_ifindex > 0 ? 1 : 0, local_ifindex);
1499 _cleanup_bus_message_unref_ sd_bus_message *m = NULL;
1501 r = sd_bus_message_new_method_call(
1504 "org.freedesktop.machine1",
1505 "/org/freedesktop/machine1",
1506 "org.freedesktop.machine1.Manager",
1507 "CreateMachineWithNetwork");
1509 log_error("Failed to create message: %s", strerror(-r));
1513 r = sd_bus_message_append(
1517 SD_BUS_MESSAGE_APPEND_ID128(arg_uuid),
1521 strempty(arg_directory),
1522 local_ifindex > 0 ? 1 : 0, local_ifindex);
1524 log_error("Failed to append message arguments: %s", strerror(-r));
1528 r = sd_bus_message_open_container(m, 'a', "(sv)");
1530 log_error("Failed to open container: %s", strerror(-r));
1534 if (!isempty(arg_slice)) {
1535 r = sd_bus_message_append(m, "(sv)", "Slice", "s", arg_slice);
1537 log_error("Failed to append slice: %s", strerror(-r));
1542 r = sd_bus_message_append(m, "(sv)", "DevicePolicy", "s", "strict");
1544 log_error("Failed to add device policy: %s", strerror(-r));
1548 r = sd_bus_message_append(m, "(sv)", "DeviceAllow", "a(ss)", 10,
1549 /* Allow the container to
1550 * access and create the API
1551 * device nodes, so that
1552 * PrivateDevices= in the
1553 * container can work
1558 "/dev/random", "rwm",
1559 "/dev/urandom", "rwm",
1561 /* Allow the container
1562 * access to ptys. However,
1564 * container to ever create
1565 * these device nodes. */
1566 "/dev/pts/ptmx", "rw",
1568 /* Allow the container
1569 * access to all kdbus
1570 * devices. Again, the
1571 * container cannot create
1572 * these nodes, only use
1573 * them. We use a pretty
1574 * open match here, so that
1575 * the kernel API can still
1578 "char-kdbus/*", "rw");
1580 log_error("Failed to add device whitelist: %s", strerror(-r));
1584 r = sd_bus_message_close_container(m);
1586 log_error("Failed to close container: %s", strerror(-r));
1590 r = sd_bus_call(bus, m, 0, &error, NULL);
1594 log_error("Failed to register machine: %s", bus_error_message(&error, r));
1601 static int terminate_machine(pid_t pid) {
1602 _cleanup_bus_error_free_ sd_bus_error error = SD_BUS_ERROR_NULL;
1603 _cleanup_bus_message_unref_ sd_bus_message *reply = NULL;
1604 _cleanup_bus_close_unref_ sd_bus *bus = NULL;
1611 r = sd_bus_default_system(&bus);
1613 log_error("Failed to open system bus: %s", strerror(-r));
1617 r = sd_bus_call_method(
1619 "org.freedesktop.machine1",
1620 "/org/freedesktop/machine1",
1621 "org.freedesktop.machine1.Manager",
1628 /* Note that the machine might already have been
1629 * cleaned up automatically, hence don't consider it a
1630 * failure if we cannot get the machine object. */
1631 log_debug("Failed to get machine: %s", bus_error_message(&error, r));
1635 r = sd_bus_message_read(reply, "o", &path);
1637 return bus_log_parse_error(r);
1639 r = sd_bus_call_method(
1641 "org.freedesktop.machine1",
1643 "org.freedesktop.machine1.Machine",
1649 log_debug("Failed to terminate machine: %s", bus_error_message(&error, r));
1656 static int reset_audit_loginuid(void) {
1657 _cleanup_free_ char *p = NULL;
1660 if (arg_share_system)
1663 r = read_one_line_file("/proc/self/loginuid", &p);
1667 log_error("Failed to read /proc/self/loginuid: %s", strerror(-r));
1671 /* Already reset? */
1672 if (streq(p, "4294967295"))
1675 r = write_string_file("/proc/self/loginuid", "4294967295");
1677 log_error("Failed to reset audit login UID. This probably means that your kernel is too\n"
1678 "old and you have audit enabled. Note that the auditing subsystem is known to\n"
1679 "be incompatible with containers on old kernels. Please make sure to upgrade\n"
1680 "your kernel or to off auditing with 'audit=0' on the kernel command line before\n"
1681 "using systemd-nspawn. Sleeping for 5s... (%s)\n", strerror(-r));
1689 #define HOST_HASH_KEY SD_ID128_MAKE(1a,37,6f,c7,46,ec,45,0b,ad,a3,d5,31,06,60,5d,b1)
1690 #define CONTAINER_HASH_KEY SD_ID128_MAKE(c3,c4,f9,19,b5,57,b2,1c,e6,cf,14,27,03,9c,ee,a2)
1692 static int generate_mac(struct ether_addr *mac, sd_id128_t hash_key) {
1699 l = strlen(arg_machine);
1700 sz = sizeof(sd_id128_t) + l;
1703 /* fetch some persistent data unique to the host */
1704 r = sd_id128_get_machine((sd_id128_t*) v);
1708 /* combine with some data unique (on this host) to this
1709 * container instance */
1710 memcpy(v + sizeof(sd_id128_t), arg_machine, l);
1712 /* Let's hash the host machine ID plus the container name. We
1713 * use a fixed, but originally randomly created hash key here. */
1714 siphash24(result, v, sz, hash_key.bytes);
1716 assert_cc(ETH_ALEN <= sizeof(result));
1717 memcpy(mac->ether_addr_octet, result, ETH_ALEN);
1719 /* see eth_random_addr in the kernel */
1720 mac->ether_addr_octet[0] &= 0xfe; /* clear multicast bit */
1721 mac->ether_addr_octet[0] |= 0x02; /* set local assignment bit (IEEE802) */
1726 static int setup_veth(pid_t pid, char iface_name[IFNAMSIZ], int *ifi) {
1727 _cleanup_rtnl_message_unref_ sd_rtnl_message *m = NULL;
1728 _cleanup_rtnl_unref_ sd_rtnl *rtnl = NULL;
1729 struct ether_addr mac_host, mac_container;
1732 if (!arg_private_network)
1735 if (!arg_network_veth)
1738 /* Use two different interface name prefixes depending whether
1739 * we are in bridge mode or not. */
1740 snprintf(iface_name, IFNAMSIZ - 1, "%s-%s",
1741 arg_network_bridge ? "vb" : "ve", arg_machine);
1743 r = generate_mac(&mac_container, CONTAINER_HASH_KEY);
1745 log_error("Failed to generate predictable MAC address for container side");
1749 r = generate_mac(&mac_host, HOST_HASH_KEY);
1751 log_error("Failed to generate predictable MAC address for host side");
1755 r = sd_rtnl_open(&rtnl, 0);
1757 log_error("Failed to connect to netlink: %s", strerror(-r));
1761 r = sd_rtnl_message_new_link(rtnl, &m, RTM_NEWLINK, 0);
1763 log_error("Failed to allocate netlink message: %s", strerror(-r));
1767 r = sd_rtnl_message_append_string(m, IFLA_IFNAME, iface_name);
1769 log_error("Failed to add netlink interface name: %s", strerror(-r));
1773 r = sd_rtnl_message_append_ether_addr(m, IFLA_ADDRESS, &mac_host);
1775 log_error("Failed to add netlink MAC address: %s", strerror(-r));
1779 r = sd_rtnl_message_open_container(m, IFLA_LINKINFO);
1781 log_error("Failed to open netlink container: %s", strerror(-r));
1785 r = sd_rtnl_message_open_container_union(m, IFLA_INFO_DATA, "veth");
1787 log_error("Failed to open netlink container: %s", strerror(-r));
1791 r = sd_rtnl_message_open_container(m, VETH_INFO_PEER);
1793 log_error("Failed to open netlink container: %s", strerror(-r));
1797 r = sd_rtnl_message_append_string(m, IFLA_IFNAME, "host0");
1799 log_error("Failed to add netlink interface name: %s", strerror(-r));
1803 r = sd_rtnl_message_append_ether_addr(m, IFLA_ADDRESS, &mac_container);
1805 log_error("Failed to add netlink MAC address: %s", strerror(-r));
1809 r = sd_rtnl_message_append_u32(m, IFLA_NET_NS_PID, pid);
1811 log_error("Failed to add netlink namespace field: %s", strerror(-r));
1815 r = sd_rtnl_message_close_container(m);
1817 log_error("Failed to close netlink container: %s", strerror(-r));
1821 r = sd_rtnl_message_close_container(m);
1823 log_error("Failed to close netlink container: %s", strerror(-r));
1827 r = sd_rtnl_message_close_container(m);
1829 log_error("Failed to close netlink container: %s", strerror(-r));
1833 r = sd_rtnl_call(rtnl, m, 0, NULL);
1835 log_error("Failed to add new veth interfaces: %s", strerror(-r));
1839 i = (int) if_nametoindex(iface_name);
1841 log_error("Failed to resolve interface %s: %m", iface_name);
1850 static int setup_bridge(const char veth_name[], int *ifi) {
1851 _cleanup_rtnl_message_unref_ sd_rtnl_message *m = NULL;
1852 _cleanup_rtnl_unref_ sd_rtnl *rtnl = NULL;
1855 if (!arg_private_network)
1858 if (!arg_network_veth)
1861 if (!arg_network_bridge)
1864 bridge = (int) if_nametoindex(arg_network_bridge);
1866 log_error("Failed to resolve interface %s: %m", arg_network_bridge);
1872 r = sd_rtnl_open(&rtnl, 0);
1874 log_error("Failed to connect to netlink: %s", strerror(-r));
1878 r = sd_rtnl_message_new_link(rtnl, &m, RTM_SETLINK, 0);
1880 log_error("Failed to allocate netlink message: %s", strerror(-r));
1884 r = sd_rtnl_message_link_set_flags(m, IFF_UP, IFF_UP);
1886 log_error("Failed to set IFF_UP flag: %s", strerror(-r));
1890 r = sd_rtnl_message_append_string(m, IFLA_IFNAME, veth_name);
1892 log_error("Failed to add netlink interface name field: %s", strerror(-r));
1896 r = sd_rtnl_message_append_u32(m, IFLA_MASTER, bridge);
1898 log_error("Failed to add netlink master field: %s", strerror(-r));
1902 r = sd_rtnl_call(rtnl, m, 0, NULL);
1904 log_error("Failed to add veth interface to bridge: %s", strerror(-r));
1911 static int parse_interface(struct udev *udev, const char *name) {
1912 _cleanup_udev_device_unref_ struct udev_device *d = NULL;
1913 char ifi_str[2 + DECIMAL_STR_MAX(int)];
1916 ifi = (int) if_nametoindex(name);
1918 log_error("Failed to resolve interface %s: %m", name);
1922 sprintf(ifi_str, "n%i", ifi);
1923 d = udev_device_new_from_device_id(udev, ifi_str);
1925 log_error("Failed to get udev device for interface %s: %m", name);
1929 if (udev_device_get_is_initialized(d) <= 0) {
1930 log_error("Network interface %s is not initialized yet.", name);
1937 static int move_network_interfaces(pid_t pid) {
1938 _cleanup_udev_unref_ struct udev *udev = NULL;
1939 _cleanup_rtnl_unref_ sd_rtnl *rtnl = NULL;
1943 if (!arg_private_network)
1946 if (strv_isempty(arg_network_interfaces))
1949 r = sd_rtnl_open(&rtnl, 0);
1951 log_error("Failed to connect to netlink: %s", strerror(-r));
1957 log_error("Failed to connect to udev.");
1961 STRV_FOREACH(i, arg_network_interfaces) {
1962 _cleanup_rtnl_message_unref_ sd_rtnl_message *m = NULL;
1965 ifi = parse_interface(udev, *i);
1969 r = sd_rtnl_message_new_link(rtnl, &m, RTM_SETLINK, ifi);
1971 log_error("Failed to allocate netlink message: %s", strerror(-r));
1975 r = sd_rtnl_message_append_u32(m, IFLA_NET_NS_PID, pid);
1977 log_error("Failed to append namespace PID to netlink message: %s", strerror(-r));
1981 r = sd_rtnl_call(rtnl, m, 0, NULL);
1983 log_error("Failed to move interface %s to namespace: %s", *i, strerror(-r));
1991 static int setup_macvlan(pid_t pid) {
1992 _cleanup_udev_unref_ struct udev *udev = NULL;
1993 _cleanup_rtnl_unref_ sd_rtnl *rtnl = NULL;
1997 if (!arg_private_network)
2000 if (strv_isempty(arg_network_macvlan))
2003 r = sd_rtnl_open(&rtnl, 0);
2005 log_error("Failed to connect to netlink: %s", strerror(-r));
2011 log_error("Failed to connect to udev.");
2015 STRV_FOREACH(i, arg_network_macvlan) {
2016 _cleanup_rtnl_message_unref_ sd_rtnl_message *m = NULL;
2017 _cleanup_free_ char *n = NULL;
2020 ifi = parse_interface(udev, *i);
2024 r = sd_rtnl_message_new_link(rtnl, &m, RTM_NEWLINK, 0);
2026 log_error("Failed to allocate netlink message: %s", strerror(-r));
2030 r = sd_rtnl_message_append_u32(m, IFLA_LINK, ifi);
2032 log_error("Failed to add netlink interface index: %s", strerror(-r));
2036 n = strappend("mv-", *i);
2040 strshorten(n, IFNAMSIZ-1);
2042 r = sd_rtnl_message_append_string(m, IFLA_IFNAME, n);
2044 log_error("Failed to add netlink interface name: %s", strerror(-r));
2048 r = sd_rtnl_message_append_u32(m, IFLA_NET_NS_PID, pid);
2050 log_error("Failed to add netlink namespace field: %s", strerror(-r));
2054 r = sd_rtnl_message_open_container(m, IFLA_LINKINFO);
2056 log_error("Failed to open netlink container: %s", strerror(-r));
2060 r = sd_rtnl_message_open_container_union(m, IFLA_INFO_DATA, "macvlan");
2062 log_error("Failed to open netlink container: %s", strerror(-r));
2066 r = sd_rtnl_message_append_u32(m, IFLA_MACVLAN_MODE, MACVLAN_MODE_BRIDGE);
2068 log_error("Failed to append macvlan mode: %s", strerror(-r));
2072 r = sd_rtnl_message_close_container(m);
2074 log_error("Failed to close netlink container: %s", strerror(-r));
2078 r = sd_rtnl_message_close_container(m);
2080 log_error("Failed to close netlink container: %s", strerror(-r));
2084 r = sd_rtnl_call(rtnl, m, 0, NULL);
2086 log_error("Failed to add new macvlan interfaces: %s", strerror(-r));
2094 static int setup_seccomp(void) {
2097 static const int blacklist[] = {
2098 SCMP_SYS(kexec_load),
2099 SCMP_SYS(open_by_handle_at),
2100 SCMP_SYS(init_module),
2101 SCMP_SYS(finit_module),
2102 SCMP_SYS(delete_module),
2109 scmp_filter_ctx seccomp;
2113 seccomp = seccomp_init(SCMP_ACT_ALLOW);
2117 r = seccomp_add_secondary_archs(seccomp);
2119 log_error("Failed to add secondary archs to seccomp filter: %s", strerror(-r));
2123 for (i = 0; i < ELEMENTSOF(blacklist); i++) {
2124 r = seccomp_rule_add(seccomp, SCMP_ACT_ERRNO(EPERM), blacklist[i], 0);
2126 continue; /* unknown syscall */
2128 log_error("Failed to block syscall: %s", strerror(-r));
2134 Audit is broken in containers, much of the userspace audit
2135 hookup will fail if running inside a container. We don't
2136 care and just turn off creation of audit sockets.
2138 This will make socket(AF_NETLINK, *, NETLINK_AUDIT) fail
2139 with EAFNOSUPPORT which audit userspace uses as indication
2140 that audit is disabled in the kernel.
2143 r = seccomp_rule_add(
2145 SCMP_ACT_ERRNO(EAFNOSUPPORT),
2148 SCMP_A0(SCMP_CMP_EQ, AF_NETLINK),
2149 SCMP_A2(SCMP_CMP_EQ, NETLINK_AUDIT));
2151 log_error("Failed to add audit seccomp rule: %s", strerror(-r));
2155 r = seccomp_attr_set(seccomp, SCMP_FLTATR_CTL_NNP, 0);
2157 log_error("Failed to unset NO_NEW_PRIVS: %s", strerror(-r));
2161 r = seccomp_load(seccomp);
2163 log_error("Failed to install seccomp audit filter: %s", strerror(-r));
2166 seccomp_release(seccomp);
2174 static int setup_image(char **device_path, int *loop_nr) {
2175 struct loop_info64 info = {
2176 .lo_flags = LO_FLAGS_AUTOCLEAR|LO_FLAGS_PARTSCAN
2178 _cleanup_close_ int fd = -1, control = -1, loop = -1;
2179 _cleanup_free_ char* loopdev = NULL;
2183 assert(device_path);
2186 fd = open(arg_image, O_CLOEXEC|(arg_read_only ? O_RDONLY : O_RDWR)|O_NONBLOCK|O_NOCTTY);
2188 log_error("Failed to open %s: %m", arg_image);
2192 if (fstat(fd, &st) < 0) {
2193 log_error("Failed to stat %s: %m", arg_image);
2197 if (S_ISBLK(st.st_mode)) {
2200 p = strdup(arg_image);
2214 if (!S_ISREG(st.st_mode)) {
2215 log_error("%s is not a regular file or block device: %m", arg_image);
2219 control = open("/dev/loop-control", O_RDWR|O_CLOEXEC|O_NOCTTY|O_NONBLOCK);
2221 log_error("Failed to open /dev/loop-control: %m");
2225 nr = ioctl(control, LOOP_CTL_GET_FREE);
2227 log_error("Failed to allocate loop device: %m");
2231 if (asprintf(&loopdev, "/dev/loop%i", nr) < 0)
2234 loop = open(loopdev, O_CLOEXEC|(arg_read_only ? O_RDONLY : O_RDWR)|O_NONBLOCK|O_NOCTTY);
2236 log_error("Failed to open loop device %s: %m", loopdev);
2240 if (ioctl(loop, LOOP_SET_FD, fd) < 0) {
2241 log_error("Failed to set loopback file descriptor on %s: %m", loopdev);
2246 info.lo_flags |= LO_FLAGS_READ_ONLY;
2248 if (ioctl(loop, LOOP_SET_STATUS64, &info) < 0) {
2249 log_error("Failed to set loopback settings on %s: %m", loopdev);
2253 *device_path = loopdev;
2264 static int dissect_image(
2266 char **root_device, bool *root_device_rw,
2267 char **home_device, bool *home_device_rw,
2268 char **srv_device, bool *srv_device_rw,
2272 int home_nr = -1, root_nr = -1, secondary_root_nr = -1, srv_nr = -1;
2273 _cleanup_free_ char *home = NULL, *root = NULL, *secondary_root = NULL, *srv = NULL;
2274 _cleanup_udev_enumerate_unref_ struct udev_enumerate *e = NULL;
2275 _cleanup_udev_device_unref_ struct udev_device *d = NULL;
2276 _cleanup_blkid_free_probe_ blkid_probe b = NULL;
2277 _cleanup_udev_unref_ struct udev *udev = NULL;
2278 struct udev_list_entry *first, *item;
2279 bool home_rw = true, root_rw = true, secondary_root_rw = true, srv_rw = true;
2280 const char *pttype = NULL;
2286 assert(root_device);
2287 assert(home_device);
2291 b = blkid_new_probe();
2296 r = blkid_probe_set_device(b, fd, 0, 0);
2301 log_error("Failed to set device on blkid probe: %m");
2305 blkid_probe_enable_partitions(b, 1);
2306 blkid_probe_set_partitions_flags(b, BLKID_PARTS_ENTRY_DETAILS);
2309 r = blkid_do_safeprobe(b);
2310 if (r == -2 || r == 1) {
2311 log_error("Failed to identify any partition table on %s.\n"
2312 "Note that the disk image needs to follow http://www.freedesktop.org/wiki/Specifications/DiscoverablePartitionsSpec/ to be supported by systemd-nspawn.", arg_image);
2314 } else if (r != 0) {
2317 log_error("Failed to probe: %m");
2321 blkid_probe_lookup_value(b, "PTTYPE", &pttype, NULL);
2322 if (!streq_ptr(pttype, "gpt")) {
2323 log_error("Image %s does not carry a GUID Partition Table.\n"
2324 "Note that the disk image needs to follow http://www.freedesktop.org/wiki/Specifications/DiscoverablePartitionsSpec/ to be supported by systemd-nspawn.", arg_image);
2329 pl = blkid_probe_get_partitions(b);
2334 log_error("Failed to list partitions of %s", arg_image);
2342 if (fstat(fd, &st) < 0) {
2343 log_error("Failed to stat block device: %m");
2347 d = udev_device_new_from_devnum(udev, 'b', st.st_rdev);
2351 e = udev_enumerate_new(udev);
2355 r = udev_enumerate_add_match_parent(e, d);
2359 r = udev_enumerate_scan_devices(e);
2361 log_error("Failed to scan for partition devices of %s: %s", arg_image, strerror(-r));
2365 first = udev_enumerate_get_list_entry(e);
2366 udev_list_entry_foreach(item, first) {
2367 _cleanup_udev_device_unref_ struct udev_device *q;
2368 const char *stype, *node;
2369 unsigned long long flags;
2376 q = udev_device_new_from_syspath(udev, udev_list_entry_get_name(item));
2381 log_error("Failed to get partition device of %s: %m", arg_image);
2385 qn = udev_device_get_devnum(q);
2389 if (st.st_rdev == qn)
2392 node = udev_device_get_devnode(q);
2396 pp = blkid_partlist_devno_to_partition(pl, qn);
2400 flags = blkid_partition_get_flags(pp);
2401 if (flags & GPT_FLAG_NO_AUTO)
2404 nr = blkid_partition_get_partno(pp);
2408 stype = blkid_partition_get_type_string(pp);
2412 if (sd_id128_from_string(stype, &type_id) < 0)
2415 if (sd_id128_equal(type_id, GPT_HOME)) {
2417 if (home && nr >= home_nr)
2421 home_rw = !(flags & GPT_FLAG_READ_ONLY);
2424 home = strdup(node);
2427 } else if (sd_id128_equal(type_id, GPT_SRV)) {
2429 if (srv && nr >= srv_nr)
2433 srv_rw = !(flags & GPT_FLAG_READ_ONLY);
2440 #ifdef GPT_ROOT_NATIVE
2441 else if (sd_id128_equal(type_id, GPT_ROOT_NATIVE)) {
2443 if (root && nr >= root_nr)
2447 root_rw = !(flags & GPT_FLAG_READ_ONLY);
2450 root = strdup(node);
2455 #ifdef GPT_ROOT_SECONDARY
2456 else if (sd_id128_equal(type_id, GPT_ROOT_SECONDARY)) {
2458 if (secondary_root && nr >= secondary_root_nr)
2461 secondary_root_nr = nr;
2462 secondary_root_rw = !(flags & GPT_FLAG_READ_ONLY);
2465 free(secondary_root);
2466 secondary_root = strdup(node);
2467 if (!secondary_root)
2473 if (!root && !secondary_root) {
2474 log_error("Failed to identify root partition in disk image %s.\n"
2475 "Note that the disk image needs to follow http://www.freedesktop.org/wiki/Specifications/DiscoverablePartitionsSpec/ to be supported by systemd-nspawn.", arg_image);
2480 *root_device = root;
2483 *root_device_rw = root_rw;
2485 } else if (secondary_root) {
2486 *root_device = secondary_root;
2487 secondary_root = NULL;
2489 *root_device_rw = secondary_root_rw;
2494 *home_device = home;
2497 *home_device_rw = home_rw;
2504 *srv_device_rw = srv_rw;
2509 log_error("--image= is not supported, compiled without blkid support.");
2514 static int mount_device(const char *what, const char *where, const char *directory, bool rw) {
2516 _cleanup_blkid_free_probe_ blkid_probe b = NULL;
2517 const char *fstype, *p;
2527 p = strappenda(where, directory);
2532 b = blkid_new_probe_from_filename(what);
2536 log_error("Failed to allocate prober for %s: %m", what);
2540 blkid_probe_enable_superblocks(b, 1);
2541 blkid_probe_set_superblocks_flags(b, BLKID_SUBLKS_TYPE);
2544 r = blkid_do_safeprobe(b);
2545 if (r == -1 || r == 1) {
2546 log_error("Cannot determine file system type of %s", what);
2548 } else if (r != 0) {
2551 log_error("Failed to probe %s: %m", what);
2556 if (blkid_probe_lookup_value(b, "TYPE", &fstype, NULL) < 0) {
2559 log_error("Failed to determine file system type of %s", what);
2563 if (streq(fstype, "crypto_LUKS")) {
2564 log_error("nspawn currently does not support LUKS disk images.");
2568 if (mount(what, p, fstype, MS_NODEV|(rw ? 0 : MS_RDONLY), NULL) < 0) {
2569 log_error("Failed to mount %s: %m", what);
2575 log_error("--image= is not supported, compiled without blkid support.");
2580 static int mount_devices(
2582 const char *root_device, bool root_device_rw,
2583 const char *home_device, bool home_device_rw,
2584 const char *srv_device, bool srv_device_rw) {
2590 r = mount_device(root_device, arg_directory, NULL, root_device_rw);
2592 log_error("Failed to mount root directory: %s", strerror(-r));
2598 r = mount_device(home_device, arg_directory, "/home", home_device_rw);
2600 log_error("Failed to mount home directory: %s", strerror(-r));
2606 r = mount_device(srv_device, arg_directory, "/srv", srv_device_rw);
2608 log_error("Failed to mount server data directory: %s", strerror(-r));
2616 static void loop_remove(int nr, int *image_fd) {
2617 _cleanup_close_ int control = -1;
2623 if (image_fd && *image_fd >= 0) {
2624 r = ioctl(*image_fd, LOOP_CLR_FD);
2626 log_warning("Failed to close loop image: %m");
2627 *image_fd = safe_close(*image_fd);
2630 control = open("/dev/loop-control", O_RDWR|O_CLOEXEC|O_NOCTTY|O_NONBLOCK);
2632 log_warning("Failed to open /dev/loop-control: %m");
2636 r = ioctl(control, LOOP_CTL_REMOVE, nr);
2638 log_warning("Failed to remove loop %d: %m", nr);
2641 static int spawn_getent(const char *database, const char *key, pid_t *rpid) {
2649 if (pipe2(pipe_fds, O_CLOEXEC) < 0) {
2650 log_error("Failed to allocate pipe: %m");
2656 log_error("Failed to fork getent child: %m");
2658 } else if (pid == 0) {
2660 char *empty_env = NULL;
2662 if (dup3(pipe_fds[1], STDOUT_FILENO, 0) < 0)
2663 _exit(EXIT_FAILURE);
2665 if (pipe_fds[0] > 2)
2666 safe_close(pipe_fds[0]);
2667 if (pipe_fds[1] > 2)
2668 safe_close(pipe_fds[1]);
2670 nullfd = open("/dev/null", O_RDWR);
2672 _exit(EXIT_FAILURE);
2674 if (dup3(nullfd, STDIN_FILENO, 0) < 0)
2675 _exit(EXIT_FAILURE);
2677 if (dup3(nullfd, STDERR_FILENO, 0) < 0)
2678 _exit(EXIT_FAILURE);
2683 reset_all_signal_handlers();
2684 close_all_fds(NULL, 0);
2686 execle("/usr/bin/getent", "getent", database, key, NULL, &empty_env);
2687 execle("/bin/getent", "getent", database, key, NULL, &empty_env);
2688 _exit(EXIT_FAILURE);
2691 pipe_fds[1] = safe_close(pipe_fds[1]);
2698 static int change_uid_gid(char **_home) {
2699 char line[LINE_MAX], *x, *u, *g, *h;
2700 const char *word, *state;
2701 _cleanup_free_ uid_t *uids = NULL;
2702 _cleanup_free_ char *home = NULL;
2703 _cleanup_fclose_ FILE *f = NULL;
2704 _cleanup_close_ int fd = -1;
2705 unsigned n_uids = 0;
2714 if (!arg_user || streq(arg_user, "root") || streq(arg_user, "0")) {
2715 /* Reset everything fully to 0, just in case */
2717 if (setgroups(0, NULL) < 0) {
2718 log_error("setgroups() failed: %m");
2722 if (setresgid(0, 0, 0) < 0) {
2723 log_error("setregid() failed: %m");
2727 if (setresuid(0, 0, 0) < 0) {
2728 log_error("setreuid() failed: %m");
2736 /* First, get user credentials */
2737 fd = spawn_getent("passwd", arg_user, &pid);
2741 f = fdopen(fd, "r");
2746 if (!fgets(line, sizeof(line), f)) {
2749 log_error("Failed to resolve user %s.", arg_user);
2753 log_error("Failed to read from getent: %m");
2759 wait_for_terminate_and_warn("getent passwd", pid);
2761 x = strchr(line, ':');
2763 log_error("/etc/passwd entry has invalid user field.");
2767 u = strchr(x+1, ':');
2769 log_error("/etc/passwd entry has invalid password field.");
2776 log_error("/etc/passwd entry has invalid UID field.");
2784 log_error("/etc/passwd entry has invalid GID field.");
2789 h = strchr(x+1, ':');
2791 log_error("/etc/passwd entry has invalid GECOS field.");
2798 log_error("/etc/passwd entry has invalid home directory field.");
2804 r = parse_uid(u, &uid);
2806 log_error("Failed to parse UID of user.");
2810 r = parse_gid(g, &gid);
2812 log_error("Failed to parse GID of user.");
2820 /* Second, get group memberships */
2821 fd = spawn_getent("initgroups", arg_user, &pid);
2826 f = fdopen(fd, "r");
2831 if (!fgets(line, sizeof(line), f)) {
2833 log_error("Failed to resolve user %s.", arg_user);
2837 log_error("Failed to read from getent: %m");
2843 wait_for_terminate_and_warn("getent initgroups", pid);
2845 /* Skip over the username and subsequent separator whitespace */
2847 x += strcspn(x, WHITESPACE);
2848 x += strspn(x, WHITESPACE);
2850 FOREACH_WORD(word, l, x, state) {
2856 if (!GREEDY_REALLOC(uids, sz, n_uids+1))
2859 r = parse_uid(c, &uids[n_uids++]);
2861 log_error("Failed to parse group data from getent.");
2866 r = mkdir_parents(home, 0775);
2868 log_error("Failed to make home root directory: %s", strerror(-r));
2872 r = mkdir_safe(home, 0755, uid, gid);
2873 if (r < 0 && r != -EEXIST) {
2874 log_error("Failed to make home directory: %s", strerror(-r));
2878 fchown(STDIN_FILENO, uid, gid);
2879 fchown(STDOUT_FILENO, uid, gid);
2880 fchown(STDERR_FILENO, uid, gid);
2882 if (setgroups(n_uids, uids) < 0) {
2883 log_error("Failed to set auxiliary groups: %m");
2887 if (setresgid(gid, gid, gid) < 0) {
2888 log_error("setregid() failed: %m");
2892 if (setresuid(uid, uid, uid) < 0) {
2893 log_error("setreuid() failed: %m");
2907 * < 0 : wait_for_terminate() failed to get the state of the
2908 * container, the container was terminated by a signal, or
2909 * failed for an unknown reason. No change is made to the
2910 * container argument.
2911 * > 0 : The program executed in the container terminated with an
2912 * error. The exit code of the program executed in the
2913 * container is returned. No change is made to the container
2915 * 0 : The container is being rebooted, has been shut down or exited
2916 * successfully. The container argument has been set to either
2917 * CONTAINER_TERMINATED or CONTAINER_REBOOTED.
2919 * That is, success is indicated by a return value of zero, and an
2920 * error is indicated by a non-zero value.
2922 static int wait_for_container(pid_t pid, ContainerStatus *container) {
2926 r = wait_for_terminate(pid, &status);
2928 log_warning("Failed to wait for container: %s", strerror(-r));
2932 switch (status.si_code) {
2934 r = status.si_status;
2937 log_debug("Container %s exited successfully.",
2940 *container = CONTAINER_TERMINATED;
2942 log_error("Container %s failed with error code %i.",
2943 arg_machine, status.si_status);
2948 if (status.si_status == SIGINT) {
2950 log_info("Container %s has been shut down.",
2953 *container = CONTAINER_TERMINATED;
2956 } else if (status.si_status == SIGHUP) {
2958 log_info("Container %s is being rebooted.",
2961 *container = CONTAINER_REBOOTED;
2965 /* CLD_KILLED fallthrough */
2968 log_error("Container %s terminated by signal %s.",
2969 arg_machine, signal_to_string(status.si_status));
2974 log_error("Container %s failed due to unknown reason.",
2983 static void nop_handler(int sig) {}
2985 int main(int argc, char *argv[]) {
2987 _cleanup_free_ char *kdbus_domain = NULL, *device_path = NULL, *root_device = NULL, *home_device = NULL, *srv_device = NULL;
2988 bool root_device_rw = true, home_device_rw = true, srv_device_rw = true;
2989 _cleanup_close_ int master = -1, kdbus_fd = -1, image_fd = -1;
2990 _cleanup_close_pair_ int kmsg_socket_pair[2] = { -1, -1 };
2991 _cleanup_fdset_free_ FDSet *fds = NULL;
2992 int r = EXIT_FAILURE, k, n_fd_passed, loop_nr = -1;
2993 const char *console = NULL;
2994 char veth_name[IFNAMSIZ];
2995 bool secondary = false;
2996 sigset_t mask, mask_chld;
2999 log_parse_environment();
3002 k = parse_argv(argc, argv);
3011 if (arg_directory) {
3014 p = path_make_absolute_cwd(arg_directory);
3015 free(arg_directory);
3018 arg_directory = get_current_dir_name();
3020 if (!arg_directory) {
3021 log_error("Failed to determine path, please use -D.");
3024 path_kill_slashes(arg_directory);
3028 arg_machine = strdup(basename(arg_image ? arg_image : arg_directory));
3034 hostname_cleanup(arg_machine, false);
3035 if (isempty(arg_machine)) {
3036 log_error("Failed to determine machine name automatically, please use -M.");
3041 if (geteuid() != 0) {
3042 log_error("Need to be root.");
3046 if (sd_booted() <= 0) {
3047 log_error("Not running on a systemd system.");
3052 n_fd_passed = sd_listen_fds(false);
3053 if (n_fd_passed > 0) {
3054 k = fdset_new_listen_fds(&fds, false);
3056 log_error("Failed to collect file descriptors: %s", strerror(-k));
3060 fdset_close_others(fds);
3063 if (arg_directory) {
3064 if (path_equal(arg_directory, "/")) {
3065 log_error("Spawning container on root directory not supported.");
3070 if (path_is_os_tree(arg_directory) <= 0) {
3071 log_error("Directory %s doesn't look like an OS root directory (os-release file is missing). Refusing.", arg_directory);
3077 p = strappenda(arg_directory,
3078 argc > optind && path_is_absolute(argv[optind]) ? argv[optind] : "/usr/bin/");
3079 if (access(p, F_OK) < 0) {
3080 log_error("Directory %s lacks the binary to execute or doesn't look like a binary tree. Refusing.", arg_directory);
3086 char template[] = "/tmp/nspawn-root-XXXXXX";
3088 if (!mkdtemp(template)) {
3089 log_error("Failed to create temporary directory: %m");
3094 arg_directory = strdup(template);
3095 if (!arg_directory) {
3100 image_fd = setup_image(&device_path, &loop_nr);
3106 r = dissect_image(image_fd,
3107 &root_device, &root_device_rw,
3108 &home_device, &home_device_rw,
3109 &srv_device, &srv_device_rw,
3115 master = posix_openpt(O_RDWR|O_NOCTTY|O_CLOEXEC|O_NDELAY);
3117 log_error("Failed to acquire pseudo tty: %m");
3121 console = ptsname(master);
3123 log_error("Failed to determine tty name: %m");
3128 log_info("Spawning container %s on %s.\nPress ^] three times within 1s to kill container.",
3129 arg_machine, arg_image ? arg_image : arg_directory);
3131 if (unlockpt(master) < 0) {
3132 log_error("Failed to unlock tty: %m");
3136 if (access("/dev/kdbus/control", F_OK) >= 0) {
3138 if (arg_share_system) {
3139 kdbus_domain = strdup("/dev/kdbus");
3140 if (!kdbus_domain) {
3147 ns = strappenda("machine-", arg_machine);
3148 kdbus_fd = bus_kernel_create_domain(ns, &kdbus_domain);
3150 log_debug("Failed to create kdbus domain: %s", strerror(-r));
3152 log_debug("Successfully created kdbus domain as %s", kdbus_domain);
3156 if (socketpair(AF_UNIX, SOCK_DGRAM|SOCK_NONBLOCK|SOCK_CLOEXEC, 0, kmsg_socket_pair) < 0) {
3157 log_error("Failed to create kmsg socket pair: %m");
3163 "STATUS=Container running.");
3165 assert_se(sigemptyset(&mask) == 0);
3166 assert_se(sigemptyset(&mask_chld) == 0);
3167 sigaddset(&mask_chld, SIGCHLD);
3168 sigset_add_many(&mask, SIGCHLD, SIGWINCH, SIGTERM, SIGINT, -1);
3169 assert_se(sigprocmask(SIG_BLOCK, &mask, NULL) == 0);
3172 ContainerStatus container_status;
3173 _cleanup_(barrier_destroy) Barrier barrier = BARRIER_NULL;
3174 struct sigaction sa = {
3175 .sa_handler = nop_handler,
3176 .sa_flags = SA_NOCLDSTOP,
3179 r = barrier_create(&barrier);
3181 log_error("Cannot initialize IPC barrier: %s", strerror(-r));
3185 /* Child can be killed before execv(), so handle SIGCHLD
3186 * in order to interrupt parent's blocking calls and
3187 * give it a chance to call wait() and terminate. */
3188 r = sigprocmask(SIG_UNBLOCK, &mask_chld, NULL);
3190 log_error("Failed to change the signal mask: %m");
3194 r = sigaction(SIGCHLD, &sa, NULL);
3196 log_error("Failed to install SIGCHLD handler: %m");
3200 pid = syscall(__NR_clone, SIGCHLD|CLONE_NEWNS|
3201 (arg_share_system ? 0 : CLONE_NEWIPC|CLONE_NEWPID|CLONE_NEWUTS)|
3202 (arg_private_network ? CLONE_NEWNET : 0), NULL);
3204 if (errno == EINVAL)
3205 log_error("clone() failed, do you have namespace support enabled in your kernel? (You need UTS, IPC, PID and NET namespacing built in): %m");
3207 log_error("clone() failed: %m");
3215 _cleanup_free_ char *home = NULL;
3217 const char *envp[] = {
3218 "PATH=" DEFAULT_PATH_SPLIT_USR,
3219 "container=systemd-nspawn", /* LXC sets container=lxc, so follow the scheme here */
3224 NULL, /* container_uuid */
3225 NULL, /* LISTEN_FDS */
3226 NULL, /* LISTEN_PID */
3231 barrier_set_role(&barrier, BARRIER_CHILD);
3233 envp[n_env] = strv_find_prefix(environ, "TERM=");
3237 master = safe_close(master);
3239 close_nointr(STDIN_FILENO);
3240 close_nointr(STDOUT_FILENO);
3241 close_nointr(STDERR_FILENO);
3243 kmsg_socket_pair[0] = safe_close(kmsg_socket_pair[0]);
3245 reset_all_signal_handlers();
3246 reset_signal_mask();
3248 k = open_terminal(console, O_RDWR);
3249 if (k != STDIN_FILENO) {
3255 log_error("Failed to open console: %s", strerror(-k));
3256 _exit(EXIT_FAILURE);
3259 if (dup2(STDIN_FILENO, STDOUT_FILENO) != STDOUT_FILENO ||
3260 dup2(STDIN_FILENO, STDERR_FILENO) != STDERR_FILENO) {
3261 log_error("Failed to duplicate console: %m");
3262 _exit(EXIT_FAILURE);
3266 log_error("setsid() failed: %m");
3267 _exit(EXIT_FAILURE);
3270 if (reset_audit_loginuid() < 0)
3271 _exit(EXIT_FAILURE);
3273 if (prctl(PR_SET_PDEATHSIG, SIGKILL) < 0) {
3274 log_error("PR_SET_PDEATHSIG failed: %m");
3275 _exit(EXIT_FAILURE);
3278 /* Mark everything as slave, so that we still
3279 * receive mounts from the real root, but don't
3280 * propagate mounts to the real root. */
3281 if (mount(NULL, "/", NULL, MS_SLAVE|MS_REC, NULL) < 0) {
3282 log_error("MS_SLAVE|MS_REC failed: %m");
3283 _exit(EXIT_FAILURE);
3286 if (mount_devices(arg_directory,
3287 root_device, root_device_rw,
3288 home_device, home_device_rw,
3289 srv_device, srv_device_rw) < 0)
3290 _exit(EXIT_FAILURE);
3292 /* Turn directory into bind mount */
3293 if (mount(arg_directory, arg_directory, "bind", MS_BIND|MS_REC, NULL) < 0) {
3294 log_error("Failed to make bind mount: %m");
3295 _exit(EXIT_FAILURE);
3298 r = setup_volatile(arg_directory);
3300 _exit(EXIT_FAILURE);
3302 if (setup_volatile_state(arg_directory) < 0)
3303 _exit(EXIT_FAILURE);
3305 r = base_filesystem_create(arg_directory);
3307 _exit(EXIT_FAILURE);
3309 if (arg_read_only) {
3310 k = bind_remount_recursive(arg_directory, true);
3312 log_error("Failed to make tree read-only: %s", strerror(-k));
3313 _exit(EXIT_FAILURE);
3317 if (mount_all(arg_directory) < 0)
3318 _exit(EXIT_FAILURE);
3320 if (copy_devnodes(arg_directory) < 0)
3321 _exit(EXIT_FAILURE);
3323 if (setup_ptmx(arg_directory) < 0)
3324 _exit(EXIT_FAILURE);
3326 dev_setup(arg_directory);
3328 if (setup_seccomp() < 0)
3329 _exit(EXIT_FAILURE);
3331 if (setup_dev_console(arg_directory, console) < 0)
3332 _exit(EXIT_FAILURE);
3334 if (setup_kmsg(arg_directory, kmsg_socket_pair[1]) < 0)
3335 _exit(EXIT_FAILURE);
3337 kmsg_socket_pair[1] = safe_close(kmsg_socket_pair[1]);
3339 if (setup_boot_id(arg_directory) < 0)
3340 _exit(EXIT_FAILURE);
3342 if (setup_timezone(arg_directory) < 0)
3343 _exit(EXIT_FAILURE);
3345 if (setup_resolv_conf(arg_directory) < 0)
3346 _exit(EXIT_FAILURE);
3348 if (setup_journal(arg_directory) < 0)
3349 _exit(EXIT_FAILURE);
3351 if (mount_binds(arg_directory, arg_bind, false) < 0)
3352 _exit(EXIT_FAILURE);
3354 if (mount_binds(arg_directory, arg_bind_ro, true) < 0)
3355 _exit(EXIT_FAILURE);
3357 if (mount_tmpfs(arg_directory) < 0)
3358 _exit(EXIT_FAILURE);
3360 if (setup_kdbus(arg_directory, kdbus_domain) < 0)
3361 _exit(EXIT_FAILURE);
3363 /* Tell the parent that we are ready, and that
3364 * it can cgroupify us to that we lack access
3365 * to certain devices and resources. */
3366 barrier_place(&barrier);
3368 if (chdir(arg_directory) < 0) {
3369 log_error("chdir(%s) failed: %m", arg_directory);
3370 _exit(EXIT_FAILURE);
3373 if (mount(arg_directory, "/", NULL, MS_MOVE, NULL) < 0) {
3374 log_error("mount(MS_MOVE) failed: %m");
3375 _exit(EXIT_FAILURE);
3378 if (chroot(".") < 0) {
3379 log_error("chroot() failed: %m");
3380 _exit(EXIT_FAILURE);
3383 if (chdir("/") < 0) {
3384 log_error("chdir() failed: %m");
3385 _exit(EXIT_FAILURE);
3390 if (arg_private_network)
3393 if (drop_capabilities() < 0) {
3394 log_error("drop_capabilities() failed: %m");
3395 _exit(EXIT_FAILURE);
3398 r = change_uid_gid(&home);
3400 _exit(EXIT_FAILURE);
3402 if ((asprintf((char**)(envp + n_env++), "HOME=%s", home ? home: "/root") < 0) ||
3403 (asprintf((char**)(envp + n_env++), "USER=%s", arg_user ? arg_user : "root") < 0) ||
3404 (asprintf((char**)(envp + n_env++), "LOGNAME=%s", arg_user ? arg_user : "root") < 0)) {
3406 _exit(EXIT_FAILURE);
3409 if (!sd_id128_equal(arg_uuid, SD_ID128_NULL)) {
3412 if (asprintf((char**)(envp + n_env++), "container_uuid=%s", id128_format_as_uuid(arg_uuid, as_uuid)) < 0) {
3414 _exit(EXIT_FAILURE);
3418 if (fdset_size(fds) > 0) {
3419 k = fdset_cloexec(fds, false);
3421 log_error("Failed to unset O_CLOEXEC for file descriptors.");
3422 _exit(EXIT_FAILURE);
3425 if ((asprintf((char **)(envp + n_env++), "LISTEN_FDS=%u", n_fd_passed) < 0) ||
3426 (asprintf((char **)(envp + n_env++), "LISTEN_PID=1") < 0)) {
3428 _exit(EXIT_FAILURE);
3434 if (arg_personality != 0xffffffffLU) {
3435 if (personality(arg_personality) < 0) {
3436 log_error("personality() failed: %m");
3437 _exit(EXIT_FAILURE);
3439 } else if (secondary) {
3440 if (personality(PER_LINUX32) < 0) {
3441 log_error("personality() failed: %m");
3442 _exit(EXIT_FAILURE);
3447 if (arg_selinux_context)
3448 if (setexeccon((security_context_t) arg_selinux_context) < 0) {
3449 log_error("setexeccon(\"%s\") failed: %m", arg_selinux_context);
3450 _exit(EXIT_FAILURE);
3454 if (!strv_isempty(arg_setenv)) {
3457 n = strv_env_merge(2, envp, arg_setenv);
3460 _exit(EXIT_FAILURE);
3465 env_use = (char**) envp;
3467 /* Wait until the parent is ready with the setup, too... */
3468 if (!barrier_place_and_sync(&barrier))
3469 _exit(EXIT_FAILURE);
3475 /* Automatically search for the init system */
3477 l = 1 + argc - optind;
3478 a = newa(char*, l + 1);
3479 memcpy(a + 1, argv + optind, l * sizeof(char*));
3481 a[0] = (char*) "/usr/lib/systemd/systemd";
3482 execve(a[0], a, env_use);
3484 a[0] = (char*) "/lib/systemd/systemd";
3485 execve(a[0], a, env_use);
3487 a[0] = (char*) "/sbin/init";
3488 execve(a[0], a, env_use);
3489 } else if (argc > optind)
3490 execvpe(argv[optind], argv + optind, env_use);
3492 chdir(home ? home : "/root");
3493 execle("/bin/bash", "-bash", NULL, env_use);
3494 execle("/bin/sh", "-sh", NULL, env_use);
3497 log_error("execv() failed: %m");
3498 _exit(EXIT_FAILURE);
3501 barrier_set_role(&barrier, BARRIER_PARENT);
3505 /* wait for child-setup to be done */
3506 if (barrier_place_and_sync(&barrier)) {
3509 r = move_network_interfaces(pid);
3513 r = setup_veth(pid, veth_name, &ifi);
3517 r = setup_bridge(veth_name, &ifi);
3521 r = setup_macvlan(pid);
3525 r = register_machine(pid, ifi);
3529 /* Block SIGCHLD here, before notifying child.
3530 * process_pty() will handle it with the other signals. */
3531 r = sigprocmask(SIG_BLOCK, &mask_chld, NULL);
3535 /* Reset signal to default */
3536 r = default_signals(SIGCHLD, -1);
3540 /* Notify the child that the parent is ready with all
3541 * its setup, and that the child can now hand over
3542 * control to the code to run inside the container. */
3543 barrier_place(&barrier);
3545 k = process_pty(master, &mask, arg_boot ? pid : 0, SIGRTMIN+3);
3554 /* Kill if it is not dead yet anyway */
3555 terminate_machine(pid);
3558 /* Normally redundant, but better safe than sorry */
3561 r = wait_for_container(pid, &container_status);
3565 /* We failed to wait for the container, or the
3566 * container exited abnormally */
3569 } else if (r > 0 || container_status == CONTAINER_TERMINATED)
3570 /* The container exited with a non-zero
3571 * status, or with zero status and no reboot
3575 /* CONTAINER_REBOOTED, loop again */
3577 if (arg_keep_unit) {
3578 /* Special handling if we are running as a
3579 * service: instead of simply restarting the
3580 * machine we want to restart the entire
3581 * service, so let's inform systemd about this
3582 * with the special exit code 133. The service
3583 * file uses RestartForceExitStatus=133 so
3584 * that this results in a full nspawn
3585 * restart. This is necessary since we might
3586 * have cgroup parameters set we want to have
3596 "STATUS=Terminating...");
3598 loop_remove(loop_nr, &image_fd);
3603 free(arg_directory);
3606 strv_free(arg_setenv);
3607 strv_free(arg_network_interfaces);
3608 strv_free(arg_network_macvlan);
3609 strv_free(arg_bind);
3610 strv_free(arg_bind_ro);
3611 strv_free(arg_tmpfs);