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/>.
22 #include <dbus/dbus.h>
28 #include <sys/types.h>
34 #include <sys/prctl.h>
35 #include <sys/mount.h>
39 #include "load-fragment.h"
42 #include "conf-parser.h"
43 #include "bus-errors.h"
51 #include "path-util.h"
53 #include "mount-setup.h"
54 #include "loopback-setup.h"
55 #include "kmod-setup.h"
56 #include "hostname-setup.h"
57 #include "machine-id-setup.h"
58 #include "locale-setup.h"
60 #include "selinux-setup.h"
61 #include "ima-setup.h"
67 ACTION_DUMP_CONFIGURATION_ITEMS,
69 } arg_action = ACTION_RUN;
71 static char *arg_default_unit = NULL;
72 static ManagerRunningAs arg_running_as = _MANAGER_RUNNING_AS_INVALID;
74 static bool arg_dump_core = true;
75 static bool arg_crash_shell = false;
76 static int arg_crash_chvt = -1;
77 static bool arg_confirm_spawn = false;
78 static bool arg_show_status = true;
79 #ifdef HAVE_SYSV_COMPAT
80 static bool arg_sysv_console = true;
82 static char **arg_default_controllers = NULL;
83 static char ***arg_join_controllers = NULL;
84 static ExecOutput arg_default_std_output = EXEC_OUTPUT_JOURNAL;
85 static ExecOutput arg_default_std_error = EXEC_OUTPUT_INHERIT;
86 static usec_t arg_runtime_watchdog = 0;
87 static usec_t arg_shutdown_watchdog = 10 * USEC_PER_MINUTE;
89 static FILE* serialization = NULL;
91 static void nop_handler(int sig) {
94 _noreturn_ static void crash(int sig) {
97 log_error("Caught <%s>, not dumping core.", signal_to_string(sig));
102 /* We want to wait for the core process, hence let's enable SIGCHLD */
104 sa.sa_handler = nop_handler;
105 sa.sa_flags = SA_NOCLDSTOP|SA_RESTART;
106 assert_se(sigaction(SIGCHLD, &sa, NULL) == 0);
108 if ((pid = fork()) < 0)
109 log_error("Caught <%s>, cannot fork for core dump: %s", signal_to_string(sig), strerror(errno));
114 /* Enable default signal handler for core dump */
116 sa.sa_handler = SIG_DFL;
117 assert_se(sigaction(sig, &sa, NULL) == 0);
119 /* Don't limit the core dump size */
121 rl.rlim_cur = RLIM_INFINITY;
122 rl.rlim_max = RLIM_INFINITY;
123 setrlimit(RLIMIT_CORE, &rl);
125 /* Just to be sure... */
126 assert_se(chdir("/") == 0);
128 /* Raise the signal again */
131 assert_not_reached("We shouldn't be here...");
138 /* Order things nicely. */
139 if ((r = wait_for_terminate(pid, &status)) < 0)
140 log_error("Caught <%s>, waitpid() failed: %s", signal_to_string(sig), strerror(-r));
141 else if (status.si_code != CLD_DUMPED)
142 log_error("Caught <%s>, core dump failed.", signal_to_string(sig));
144 log_error("Caught <%s>, dumped core as pid %lu.", signal_to_string(sig), (unsigned long) pid);
149 chvt(arg_crash_chvt);
151 if (arg_crash_shell) {
155 log_info("Executing crash shell in 10s...");
158 /* Let the kernel reap children for us */
160 sa.sa_handler = SIG_IGN;
161 sa.sa_flags = SA_NOCLDSTOP|SA_NOCLDWAIT|SA_RESTART;
162 assert_se(sigaction(SIGCHLD, &sa, NULL) == 0);
164 if ((pid = fork()) < 0)
165 log_error("Failed to fork off crash shell: %s", strerror(errno));
169 if ((fd = acquire_terminal("/dev/console", false, true, true)) < 0)
170 log_error("Failed to acquire terminal: %s", strerror(-fd));
171 else if ((r = make_stdio(fd)) < 0)
172 log_error("Failed to duplicate terminal fd: %s", strerror(-r));
174 execl("/bin/sh", "/bin/sh", NULL);
176 log_error("execl() failed: %s", strerror(errno));
180 log_info("Successfully spawned crash shell as pid %lu.", (unsigned long) pid);
183 log_info("Freezing execution.");
187 static void install_crash_handler(void) {
192 sa.sa_handler = crash;
193 sa.sa_flags = SA_NODEFER;
195 sigaction_many(&sa, SIGNALS_CRASH_HANDLER, -1);
198 static int console_setup(bool do_reset) {
201 /* If we are init, we connect stdin/stdout/stderr to /dev/null
202 * and make sure we don't have a controlling tty. */
209 tty_fd = open_terminal("/dev/console", O_WRONLY|O_NOCTTY|O_CLOEXEC);
211 log_error("Failed to open /dev/console: %s", strerror(-tty_fd));
215 /* We don't want to force text mode.
216 * plymouth may be showing pictures already from initrd. */
217 r = reset_terminal_fd(tty_fd, false);
219 log_error("Failed to reset /dev/console: %s", strerror(-r));
221 close_nointr_nofail(tty_fd);
225 static int set_default_unit(const char *u) {
230 if (!(c = strdup(u)))
233 free(arg_default_unit);
234 arg_default_unit = c;
238 static int parse_proc_cmdline_word(const char *word) {
240 static const char * const rlmap[] = {
241 "emergency", SPECIAL_EMERGENCY_TARGET,
242 "-b", SPECIAL_EMERGENCY_TARGET,
243 "single", SPECIAL_RESCUE_TARGET,
244 "-s", SPECIAL_RESCUE_TARGET,
245 "s", SPECIAL_RESCUE_TARGET,
246 "S", SPECIAL_RESCUE_TARGET,
247 "1", SPECIAL_RESCUE_TARGET,
248 "2", SPECIAL_RUNLEVEL2_TARGET,
249 "3", SPECIAL_RUNLEVEL3_TARGET,
250 "4", SPECIAL_RUNLEVEL4_TARGET,
251 "5", SPECIAL_RUNLEVEL5_TARGET,
256 if (startswith(word, "systemd.unit="))
257 return set_default_unit(word + 13);
259 else if (startswith(word, "systemd.log_target=")) {
261 if (log_set_target_from_string(word + 19) < 0)
262 log_warning("Failed to parse log target %s. Ignoring.", word + 19);
264 } else if (startswith(word, "systemd.log_level=")) {
266 if (log_set_max_level_from_string(word + 18) < 0)
267 log_warning("Failed to parse log level %s. Ignoring.", word + 18);
269 } else if (startswith(word, "systemd.log_color=")) {
271 if (log_show_color_from_string(word + 18) < 0)
272 log_warning("Failed to parse log color setting %s. Ignoring.", word + 18);
274 } else if (startswith(word, "systemd.log_location=")) {
276 if (log_show_location_from_string(word + 21) < 0)
277 log_warning("Failed to parse log location setting %s. Ignoring.", word + 21);
279 } else if (startswith(word, "systemd.dump_core=")) {
282 if ((r = parse_boolean(word + 18)) < 0)
283 log_warning("Failed to parse dump core switch %s. Ignoring.", word + 18);
287 } else if (startswith(word, "systemd.crash_shell=")) {
290 if ((r = parse_boolean(word + 20)) < 0)
291 log_warning("Failed to parse crash shell switch %s. Ignoring.", word + 20);
295 } else if (startswith(word, "systemd.confirm_spawn=")) {
298 if ((r = parse_boolean(word + 22)) < 0)
299 log_warning("Failed to parse confirm spawn switch %s. Ignoring.", word + 22);
301 arg_confirm_spawn = r;
303 } else if (startswith(word, "systemd.crash_chvt=")) {
306 if (safe_atoi(word + 19, &k) < 0)
307 log_warning("Failed to parse crash chvt switch %s. Ignoring.", word + 19);
311 } else if (startswith(word, "systemd.show_status=")) {
314 if ((r = parse_boolean(word + 20)) < 0)
315 log_warning("Failed to parse show status switch %s. Ignoring.", word + 20);
318 } else if (startswith(word, "systemd.default_standard_output=")) {
321 if ((r = exec_output_from_string(word + 32)) < 0)
322 log_warning("Failed to parse default standard output switch %s. Ignoring.", word + 32);
324 arg_default_std_output = r;
325 } else if (startswith(word, "systemd.default_standard_error=")) {
328 if ((r = exec_output_from_string(word + 31)) < 0)
329 log_warning("Failed to parse default standard error switch %s. Ignoring.", word + 31);
331 arg_default_std_error = r;
332 } else if (startswith(word, "systemd.setenv=")) {
336 cenv = strdup(word + 15);
340 eq = strchr(cenv, '=');
344 log_warning("unsetenv failed %s. Ignoring.", strerror(errno));
347 r = setenv(cenv, eq + 1, 1);
349 log_warning("setenv failed %s. Ignoring.", strerror(errno));
352 #ifdef HAVE_SYSV_COMPAT
353 } else if (startswith(word, "systemd.sysv_console=")) {
356 if ((r = parse_boolean(word + 21)) < 0)
357 log_warning("Failed to parse SysV console switch %s. Ignoring.", word + 20);
359 arg_sysv_console = r;
362 } else if (startswith(word, "systemd.")) {
364 log_warning("Unknown kernel switch %s. Ignoring.", word);
366 log_info("Supported kernel switches:\n"
367 "systemd.unit=UNIT Default unit to start\n"
368 "systemd.dump_core=0|1 Dump core on crash\n"
369 "systemd.crash_shell=0|1 Run shell on crash\n"
370 "systemd.crash_chvt=N Change to VT #N on crash\n"
371 "systemd.confirm_spawn=0|1 Confirm every process spawn\n"
372 "systemd.show_status=0|1 Show status updates on the console during bootup\n"
373 #ifdef HAVE_SYSV_COMPAT
374 "systemd.sysv_console=0|1 Connect output of SysV scripts to console\n"
376 "systemd.log_target=console|kmsg|journal|journal-or-kmsg|syslog|syslog-or-kmsg|null\n"
378 "systemd.log_level=LEVEL Log level\n"
379 "systemd.log_color=0|1 Highlight important log messages\n"
380 "systemd.log_location=0|1 Include code location in log messages\n"
381 "systemd.default_standard_output=null|tty|syslog|syslog+console|kmsg|kmsg+console|journal|journal+console\n"
382 " Set default log output for services\n"
383 "systemd.default_standard_error=null|tty|syslog|syslog+console|kmsg|kmsg+console|journal|journal+console\n"
384 " Set default log error output for services\n");
386 } else if (streq(word, "quiet")) {
387 arg_show_status = false;
388 #ifdef HAVE_SYSV_COMPAT
389 arg_sysv_console = false;
394 /* SysV compatibility */
395 for (i = 0; i < ELEMENTSOF(rlmap); i += 2)
396 if (streq(word, rlmap[i]))
397 return set_default_unit(rlmap[i+1]);
403 static int config_parse_level2(
404 const char *filename,
417 log_set_max_level_from_string(rvalue);
421 static int config_parse_target(
422 const char *filename,
435 log_set_target_from_string(rvalue);
439 static int config_parse_color(
440 const char *filename,
453 log_show_color_from_string(rvalue);
457 static int config_parse_location(
458 const char *filename,
471 log_show_location_from_string(rvalue);
475 static int config_parse_cpu_affinity2(
476 const char *filename,
495 FOREACH_WORD_QUOTED(w, l, rvalue, state) {
500 if (!(t = strndup(w, l)))
503 r = safe_atou(t, &cpu);
507 if (!(c = cpu_set_malloc(&ncpus)))
510 if (r < 0 || cpu >= ncpus) {
511 log_error("[%s:%u] Failed to parse CPU affinity: %s", filename, line, rvalue);
516 CPU_SET_S(cpu, CPU_ALLOC_SIZE(ncpus), c);
520 if (sched_setaffinity(0, CPU_ALLOC_SIZE(ncpus), c) < 0)
521 log_warning("Failed to set CPU affinity: %m");
529 static void strv_free_free(char ***l) {
541 static void free_join_controllers(void) {
542 if (!arg_join_controllers)
545 strv_free_free(arg_join_controllers);
546 arg_join_controllers = NULL;
549 static int config_parse_join_controllers(
550 const char *filename,
567 free_join_controllers();
569 FOREACH_WORD_QUOTED(w, length, rvalue, state) {
572 s = strndup(w, length);
576 l = strv_split(s, ",");
581 if (strv_length(l) <= 1) {
586 if (!arg_join_controllers) {
587 arg_join_controllers = new(char**, 2);
588 if (!arg_join_controllers) {
593 arg_join_controllers[0] = l;
594 arg_join_controllers[1] = NULL;
601 t = new0(char**, n+2);
609 for (a = arg_join_controllers; *a; a++) {
611 if (strv_overlap(*a, l)) {
614 c = strv_merge(*a, l);
637 t[n++] = strv_uniq(l);
639 strv_free_free(arg_join_controllers);
640 arg_join_controllers = t;
647 static int parse_config_file(void) {
649 const ConfigTableItem items[] = {
650 { "Manager", "LogLevel", config_parse_level2, 0, NULL },
651 { "Manager", "LogTarget", config_parse_target, 0, NULL },
652 { "Manager", "LogColor", config_parse_color, 0, NULL },
653 { "Manager", "LogLocation", config_parse_location, 0, NULL },
654 { "Manager", "DumpCore", config_parse_bool, 0, &arg_dump_core },
655 { "Manager", "CrashShell", config_parse_bool, 0, &arg_crash_shell },
656 { "Manager", "ShowStatus", config_parse_bool, 0, &arg_show_status },
657 #ifdef HAVE_SYSV_COMPAT
658 { "Manager", "SysVConsole", config_parse_bool, 0, &arg_sysv_console },
660 { "Manager", "CrashChVT", config_parse_int, 0, &arg_crash_chvt },
661 { "Manager", "CPUAffinity", config_parse_cpu_affinity2, 0, NULL },
662 { "Manager", "DefaultControllers", config_parse_strv, 0, &arg_default_controllers },
663 { "Manager", "DefaultStandardOutput", config_parse_output, 0, &arg_default_std_output },
664 { "Manager", "DefaultStandardError", config_parse_output, 0, &arg_default_std_error },
665 { "Manager", "JoinControllers", config_parse_join_controllers, 0, &arg_join_controllers },
666 { "Manager", "RuntimeWatchdogSec", config_parse_usec, 0, &arg_runtime_watchdog },
667 { "Manager", "ShutdownWatchdogSec", config_parse_usec, 0, &arg_shutdown_watchdog },
668 { NULL, NULL, NULL, 0, NULL }
675 fn = arg_running_as == MANAGER_SYSTEM ? SYSTEM_CONFIG_FILE : USER_CONFIG_FILE;
681 log_warning("Failed to open configuration file '%s': %m", fn);
685 r = config_parse(fn, f, "Manager\0", config_item_table_lookup, (void*) items, false, NULL);
687 log_warning("Failed to parse configuration file: %s", strerror(-r));
694 static int parse_proc_cmdline(void) {
695 char *line, *w, *state;
699 /* Don't read /proc/cmdline if we are in a container, since
700 * that is only relevant for the host system */
701 if (detect_container(NULL) > 0)
704 if ((r = read_one_line_file("/proc/cmdline", &line)) < 0) {
705 log_warning("Failed to read /proc/cmdline, ignoring: %s", strerror(-r));
709 FOREACH_WORD_QUOTED(w, l, line, state) {
712 if (!(word = strndup(w, l))) {
717 r = parse_proc_cmdline_word(word);
731 static int parse_argv(int argc, char *argv[]) {
734 ARG_LOG_LEVEL = 0x100,
742 ARG_DUMP_CONFIGURATION_ITEMS,
751 ARG_DEFAULT_STD_OUTPUT,
752 ARG_DEFAULT_STD_ERROR
755 static const struct option options[] = {
756 { "log-level", required_argument, NULL, ARG_LOG_LEVEL },
757 { "log-target", required_argument, NULL, ARG_LOG_TARGET },
758 { "log-color", optional_argument, NULL, ARG_LOG_COLOR },
759 { "log-location", optional_argument, NULL, ARG_LOG_LOCATION },
760 { "unit", required_argument, NULL, ARG_UNIT },
761 { "system", no_argument, NULL, ARG_SYSTEM },
762 { "user", no_argument, NULL, ARG_USER },
763 { "test", no_argument, NULL, ARG_TEST },
764 { "help", no_argument, NULL, 'h' },
765 { "dump-configuration-items", no_argument, NULL, ARG_DUMP_CONFIGURATION_ITEMS },
766 { "dump-core", optional_argument, NULL, ARG_DUMP_CORE },
767 { "crash-shell", optional_argument, NULL, ARG_CRASH_SHELL },
768 { "confirm-spawn", optional_argument, NULL, ARG_CONFIRM_SPAWN },
769 { "show-status", optional_argument, NULL, ARG_SHOW_STATUS },
770 #ifdef HAVE_SYSV_COMPAT
771 { "sysv-console", optional_argument, NULL, ARG_SYSV_CONSOLE },
773 { "deserialize", required_argument, NULL, ARG_DESERIALIZE },
774 { "switchedroot", no_argument, NULL, ARG_SWITCHEDROOT },
775 { "introspect", optional_argument, NULL, ARG_INTROSPECT },
776 { "default-standard-output", required_argument, NULL, ARG_DEFAULT_STD_OUTPUT, },
777 { "default-standard-error", required_argument, NULL, ARG_DEFAULT_STD_ERROR, },
789 while ((c = getopt_long(argc, argv, "hDbsz:", options, NULL)) >= 0)
794 if ((r = log_set_max_level_from_string(optarg)) < 0) {
795 log_error("Failed to parse log level %s.", optarg);
803 if ((r = log_set_target_from_string(optarg)) < 0) {
804 log_error("Failed to parse log target %s.", optarg);
813 if ((r = log_show_color_from_string(optarg)) < 0) {
814 log_error("Failed to parse log color setting %s.", optarg);
818 log_show_color(true);
822 case ARG_LOG_LOCATION:
825 if ((r = log_show_location_from_string(optarg)) < 0) {
826 log_error("Failed to parse log location setting %s.", optarg);
830 log_show_location(true);
834 case ARG_DEFAULT_STD_OUTPUT:
836 if ((r = exec_output_from_string(optarg)) < 0) {
837 log_error("Failed to parse default standard output setting %s.", optarg);
840 arg_default_std_output = r;
843 case ARG_DEFAULT_STD_ERROR:
845 if ((r = exec_output_from_string(optarg)) < 0) {
846 log_error("Failed to parse default standard error output setting %s.", optarg);
849 arg_default_std_error = r;
854 if ((r = set_default_unit(optarg)) < 0) {
855 log_error("Failed to set default unit %s: %s", optarg, strerror(-r));
862 arg_running_as = MANAGER_SYSTEM;
866 arg_running_as = MANAGER_USER;
870 arg_action = ACTION_TEST;
873 case ARG_DUMP_CONFIGURATION_ITEMS:
874 arg_action = ACTION_DUMP_CONFIGURATION_ITEMS;
878 r = optarg ? parse_boolean(optarg) : 1;
880 log_error("Failed to parse dump core boolean %s.", optarg);
886 case ARG_CRASH_SHELL:
887 r = optarg ? parse_boolean(optarg) : 1;
889 log_error("Failed to parse crash shell boolean %s.", optarg);
895 case ARG_CONFIRM_SPAWN:
896 r = optarg ? parse_boolean(optarg) : 1;
898 log_error("Failed to parse confirm spawn boolean %s.", optarg);
901 arg_confirm_spawn = r;
904 case ARG_SHOW_STATUS:
905 r = optarg ? parse_boolean(optarg) : 1;
907 log_error("Failed to parse show status boolean %s.", optarg);
913 #ifdef HAVE_SYSV_COMPAT
914 case ARG_SYSV_CONSOLE:
915 r = optarg ? parse_boolean(optarg) : 1;
917 log_error("Failed to parse SysV console boolean %s.", optarg);
920 arg_sysv_console = r;
924 case ARG_DESERIALIZE: {
928 if ((r = safe_atoi(optarg, &fd)) < 0 || fd < 0) {
929 log_error("Failed to parse deserialize option %s.", optarg);
933 if (!(f = fdopen(fd, "r"))) {
934 log_error("Failed to open serialization fd: %m");
939 fclose(serialization);
946 case ARG_SWITCHEDROOT:
947 /* Nothing special yet */
950 case ARG_INTROSPECT: {
951 const char * const * i = NULL;
953 for (i = bus_interface_table; *i; i += 2)
954 if (!optarg || streq(i[0], optarg)) {
955 fputs(DBUS_INTROSPECT_1_0_XML_DOCTYPE_DECL_NODE
958 fputs("</node>\n", stdout);
965 log_error("Unknown interface %s.", optarg);
967 arg_action = ACTION_DONE;
972 arg_action = ACTION_HELP;
976 log_set_max_level(LOG_DEBUG);
982 /* Just to eat away the sysvinit kernel
983 * cmdline args without getopt() error
984 * messages that we'll parse in
985 * parse_proc_cmdline_word() or ignore. */
990 log_error("Unknown option code %c", c);
997 if (optind < argc && getpid() != 1) {
998 /* Hmm, when we aren't run as init system
999 * let's complain about excess arguments */
1001 log_error("Excess arguments.");
1005 if (detect_container(NULL) > 0) {
1008 /* All /proc/cmdline arguments the kernel didn't
1009 * understand it passed to us. We're not really
1010 * interested in that usually since /proc/cmdline is
1011 * more interesting and complete. With one exception:
1012 * if we are run in a container /proc/cmdline is not
1013 * relevant for the container, hence we rely on argv[]
1016 for (a = argv; a < argv + argc; a++)
1017 if ((r = parse_proc_cmdline_word(*a)) < 0)
1024 static int help(void) {
1026 printf("%s [OPTIONS...]\n\n"
1027 "Starts up and maintains the system or user services.\n\n"
1028 " -h --help Show this help\n"
1029 " --test Determine startup sequence, dump it and exit\n"
1030 " --dump-configuration-items Dump understood unit configuration items\n"
1031 " --introspect[=INTERFACE] Extract D-Bus interface data\n"
1032 " --unit=UNIT Set default unit\n"
1033 " --system Run a system instance, even if PID != 1\n"
1034 " --user Run a user instance\n"
1035 " --dump-core[=0|1] Dump core on crash\n"
1036 " --crash-shell[=0|1] Run shell on crash\n"
1037 " --confirm-spawn[=0|1] Ask for confirmation when spawning processes\n"
1038 " --show-status[=0|1] Show status updates on the console during bootup\n"
1039 #ifdef HAVE_SYSV_COMPAT
1040 " --sysv-console[=0|1] Connect output of SysV scripts to console\n"
1042 " --log-target=TARGET Set log target (console, journal, syslog, kmsg, journal-or-kmsg, syslog-or-kmsg, null)\n"
1043 " --log-level=LEVEL Set log level (debug, info, notice, warning, err, crit, alert, emerg)\n"
1044 " --log-color[=0|1] Highlight important log messages\n"
1045 " --log-location[=0|1] Include code location in log messages\n"
1046 " --default-standard-output= Set default standard output for services\n"
1047 " --default-standard-error= Set default standard error output for services\n",
1048 program_invocation_short_name);
1053 static int prepare_reexecute(Manager *m, FILE **_f, FDSet **_fds) {
1062 /* Make sure nothing is really destructed when we shut down */
1065 if ((r = manager_open_serialization(m, &f)) < 0) {
1066 log_error("Failed to create serialization file: %s", strerror(-r));
1070 if (!(fds = fdset_new())) {
1072 log_error("Failed to allocate fd set: %s", strerror(-r));
1076 if ((r = manager_serialize(m, f, fds)) < 0) {
1077 log_error("Failed to serialize state: %s", strerror(-r));
1081 if (fseeko(f, 0, SEEK_SET) < 0) {
1082 log_error("Failed to rewind serialization fd: %m");
1086 if ((r = fd_cloexec(fileno(f), false)) < 0) {
1087 log_error("Failed to disable O_CLOEXEC for serialization: %s", strerror(-r));
1091 if ((r = fdset_cloexec(fds, false)) < 0) {
1092 log_error("Failed to disable O_CLOEXEC for serialization fds: %s", strerror(-r));
1110 static struct dual_timestamp* parse_initrd_timestamp(struct dual_timestamp *t) {
1112 unsigned long long a, b;
1116 e = getenv("RD_TIMESTAMP");
1120 if (sscanf(e, "%llu %llu", &a, &b) != 2)
1123 t->realtime = (usec_t) a;
1124 t->monotonic = (usec_t) b;
1129 static void test_mtab(void) {
1132 /* Check that /etc/mtab is a symlink */
1134 if (readlink_malloc("/etc/mtab", &p) >= 0) {
1137 b = streq(p, "/proc/self/mounts") || streq(p, "/proc/mounts");
1144 log_warning("/etc/mtab is not a symlink or not pointing to /proc/self/mounts. "
1145 "This is not supported anymore. "
1146 "Please make sure to replace this file by a symlink to avoid incorrect or misleading mount(8) output.");
1149 static void test_usr(void) {
1151 /* Check that /usr is not a separate fs */
1153 if (dir_is_empty("/usr") <= 0)
1156 log_warning("/usr appears to be on its own filesytem and is not already mounted. This is not a supported setup. "
1157 "Some things will probably break (sometimes even silently) in mysterious ways. "
1158 "Consult http://freedesktop.org/wiki/Software/systemd/separate-usr-is-broken for more information.");
1161 static void test_cgroups(void) {
1163 if (access("/proc/cgroups", F_OK) >= 0)
1166 log_warning("CONFIG_CGROUPS was not set when your kernel was compiled. "
1167 "Systems without control groups are not supported. "
1168 "We will now sleep for 10s, and then continue boot-up. "
1169 "Expect breakage and please do not file bugs. "
1170 "Instead fix your kernel and enable CONFIG_CGROUPS. "
1171 "Consult http://0pointer.de/blog/projects/cgroups-vs-cgroups.html for more information.");
1176 static int do_switch_root(const char *switch_root) {
1178 /* Don't try to unmount the old "/", there's no way to do it. */
1179 const char *umounts[] = { "/dev", "/proc", "/sys", "/run", NULL };
1182 struct stat switch_root_stat, sb;
1183 bool remove_old_root;
1185 if (path_equal(switch_root, "/"))
1188 if (stat(switch_root, &switch_root_stat) != 0) {
1190 log_error("failed to stat directory %s", switch_root);
1194 remove_old_root = in_initrd();
1196 for (i = 0; umounts[i] != NULL; i++) {
1197 char newmount[PATH_MAX];
1199 snprintf(newmount, sizeof(newmount), "%s%s", switch_root, umounts[i]);
1201 if ((stat(newmount, &sb) != 0) || (sb.st_dev != switch_root_stat.st_dev)) {
1202 /* mount point seems to be mounted already or stat failed */
1203 umount2(umounts[i], MNT_DETACH);
1207 if (mount(umounts[i], newmount, NULL, MS_MOVE, NULL) < 0) {
1208 log_error("failed to mount moving %s to %s",
1209 umounts[i], newmount);
1210 log_error("forcing unmount of %s", umounts[i]);
1211 umount2(umounts[i], MNT_FORCE);
1215 if (chdir(switch_root)) {
1217 log_error("failed to change directory to %s", switch_root);
1221 if (remove_old_root)
1222 cfd = open("/", O_RDONLY);
1224 if (mount(switch_root, "/", NULL, MS_MOVE, NULL) < 0) {
1226 log_error("failed to mount moving %s to /", switch_root);
1232 log_error("failed to change root");
1237 rm_rf_children(cfd, false, false);
1248 log_error("Failed to switch root, ignoring: %s", strerror(-r));
1253 int main(int argc, char *argv[]) {
1255 int r, retval = EXIT_FAILURE;
1256 usec_t before_startup, after_startup;
1257 char timespan[FORMAT_TIMESPAN_MAX];
1259 bool reexecute = false;
1260 const char *shutdown_verb = NULL;
1261 dual_timestamp initrd_timestamp = { 0ULL, 0ULL };
1262 static char systemd[] = "systemd";
1263 bool is_reexec = false;
1265 bool loaded_policy = false;
1266 bool arm_reboot_watchdog = false;
1267 char *switch_root = NULL, *switch_root_init = NULL;
1269 #ifdef HAVE_SYSV_COMPAT
1270 if (getpid() != 1 && strstr(program_invocation_short_name, "init")) {
1271 /* This is compatibility support for SysV, where
1272 * calling init as a user is identical to telinit. */
1275 execv(SYSTEMCTL_BINARY_PATH, argv);
1276 log_error("Failed to exec " SYSTEMCTL_BINARY_PATH ": %m");
1281 /* Determine if this is a reexecution or normal bootup. We do
1282 * the full command line parsing much later, so let's just
1283 * have a quick peek here. */
1285 for (j = 1; j < argc; j++)
1286 if (streq(argv[j], "--deserialize")) {
1291 /* If we have switched root, do all the special things */
1292 for (j = 1; j < argc; j++)
1293 if (streq(argv[j], "--switchedroot")) {
1298 /* If we get started via the /sbin/init symlink then we are
1299 called 'init'. After a subsequent reexecution we are then
1300 called 'systemd'. That is confusing, hence let's call us
1301 systemd right-away. */
1302 program_invocation_short_name = systemd;
1303 prctl(PR_SET_NAME, systemd);
1308 log_show_color(isatty(STDERR_FILENO) > 0);
1309 log_show_location(false);
1310 log_set_max_level(LOG_INFO);
1312 if (getpid() == 1) {
1314 char *rd_timestamp = NULL;
1316 dual_timestamp_get(&initrd_timestamp);
1317 asprintf(&rd_timestamp, "%llu %llu",
1318 (unsigned long long) initrd_timestamp.realtime,
1319 (unsigned long long) initrd_timestamp.monotonic);
1321 setenv("RD_TIMESTAMP", rd_timestamp, 1);
1326 arg_running_as = MANAGER_SYSTEM;
1327 log_set_target(detect_container(NULL) > 0 ? LOG_TARGET_JOURNAL : LOG_TARGET_JOURNAL_OR_KMSG);
1330 if (selinux_setup(&loaded_policy) < 0)
1332 if (ima_setup() < 0)
1338 if (label_init(NULL) < 0)
1342 if (hwclock_is_localtime() > 0) {
1345 r = hwclock_apply_localtime_delta(&min);
1347 log_error("Failed to apply local time delta, ignoring: %s", strerror(-r));
1349 log_info("RTC configured in localtime, applying delta of %i minutes to system time.", min);
1353 arg_running_as = MANAGER_USER;
1354 log_set_target(LOG_TARGET_AUTO);
1358 /* Initialize default unit */
1359 if (set_default_unit(SPECIAL_DEFAULT_TARGET) < 0)
1362 /* By default, mount "cpu" and "cpuacct" together */
1363 arg_join_controllers = new(char**, 2);
1364 if (!arg_join_controllers)
1367 arg_join_controllers[0] = strv_new("cpu", "cpuacct", NULL);
1368 arg_join_controllers[1] = NULL;
1370 if (!arg_join_controllers[0])
1373 /* Mount /proc, /sys and friends, so that /proc/cmdline and
1374 * /proc/$PID/fd is available. */
1375 if (geteuid() == 0 && !getenv("SYSTEMD_SKIP_API_MOUNTS")) {
1376 r = mount_setup(loaded_policy);
1381 /* Reset all signal handlers. */
1382 assert_se(reset_all_signal_handlers() == 0);
1384 /* If we are init, we can block sigkill. Yay. */
1385 ignore_signals(SIGNALS_IGNORE, -1);
1387 if (parse_config_file() < 0)
1390 if (arg_running_as == MANAGER_SYSTEM)
1391 if (parse_proc_cmdline() < 0)
1394 log_parse_environment();
1396 if (parse_argv(argc, argv) < 0)
1399 if (arg_action == ACTION_TEST && geteuid() == 0) {
1400 log_error("Don't run test mode as root.");
1404 if (arg_running_as == MANAGER_SYSTEM &&
1405 arg_action == ACTION_RUN &&
1406 running_in_chroot() > 0) {
1407 log_error("Cannot be run in a chroot() environment.");
1411 if (arg_action == ACTION_HELP) {
1414 } else if (arg_action == ACTION_DUMP_CONFIGURATION_ITEMS) {
1415 unit_dump_config_items(stdout);
1416 retval = EXIT_SUCCESS;
1418 } else if (arg_action == ACTION_DONE) {
1419 retval = EXIT_SUCCESS;
1423 assert_se(arg_action == ACTION_RUN || arg_action == ACTION_TEST);
1425 /* Close logging fds, in order not to confuse fdset below */
1428 /* Remember open file descriptors for later deserialization */
1429 if (serialization) {
1430 r = fdset_new_fill(&fds);
1432 log_error("Failed to allocate fd set: %s", strerror(-r));
1436 assert_se(fdset_remove(fds, fileno(serialization)) >= 0);
1438 close_all_fds(NULL, 0);
1440 /* Set up PATH unless it is already set */
1442 #ifdef HAVE_SPLIT_USR
1443 "/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin",
1445 "/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin",
1447 arg_running_as == MANAGER_SYSTEM);
1449 if (arg_running_as == MANAGER_SYSTEM) {
1450 /* Parse the data passed to us. We leave this
1451 * variables set, but the manager later on will not
1452 * pass them on to our children. */
1454 parse_initrd_timestamp(&initrd_timestamp);
1456 /* Unset some environment variables passed in from the
1457 * kernel that don't really make sense for us. */
1461 /* When we are invoked by a shell, these might be set,
1462 * but make little sense to pass on */
1467 /* When we are invoked by a tool chroot-like such as
1468 * nspawn, these might be set, but make little sense
1471 unsetenv("LOGNAME");
1473 /* All other variables are left as is, so that clients
1474 * can still read them via /proc/1/environ */
1477 /* Move out of the way, so that we won't block unmounts */
1478 assert_se(chdir("/") == 0);
1480 if (arg_running_as == MANAGER_SYSTEM) {
1481 /* Become a session leader if we aren't one yet. */
1484 /* Disable the umask logic */
1488 /* Make sure D-Bus doesn't fiddle with the SIGPIPE handlers */
1489 dbus_connection_set_change_sigpipe(FALSE);
1491 /* Reset the console, but only if this is really init and we
1492 * are freshly booted */
1493 if (arg_running_as == MANAGER_SYSTEM && arg_action == ACTION_RUN) {
1494 console_setup(getpid() == 1 && !is_reexec);
1498 /* Open the logging devices, if possible and necessary */
1501 /* Make sure we leave a core dump without panicing the
1504 install_crash_handler();
1506 if (geteuid() == 0 && !getenv("SYSTEMD_SKIP_API_MOUNTS")) {
1507 r = mount_cgroup_controllers(arg_join_controllers);
1512 log_full(arg_running_as == MANAGER_SYSTEM ? LOG_INFO : LOG_DEBUG,
1513 PACKAGE_STRING " running in %s mode. (" SYSTEMD_FEATURES "; " DISTRIBUTION ")", manager_running_as_to_string(arg_running_as));
1515 if (arg_running_as == MANAGER_SYSTEM && !is_reexec) {
1518 if (arg_show_status || plymouth_running())
1531 if (arg_running_as == MANAGER_SYSTEM && arg_runtime_watchdog > 0)
1532 watchdog_set_timeout(&arg_runtime_watchdog);
1534 r = manager_new(arg_running_as, &m);
1536 log_error("Failed to allocate manager object: %s", strerror(-r));
1540 m->confirm_spawn = arg_confirm_spawn;
1541 #ifdef HAVE_SYSV_COMPAT
1542 m->sysv_console = arg_sysv_console;
1544 m->default_std_output = arg_default_std_output;
1545 m->default_std_error = arg_default_std_error;
1546 m->runtime_watchdog = arg_runtime_watchdog;
1547 m->shutdown_watchdog = arg_shutdown_watchdog;
1549 if (dual_timestamp_is_set(&initrd_timestamp))
1550 m->initrd_timestamp = initrd_timestamp;
1552 if (arg_default_controllers)
1553 manager_set_default_controllers(m, arg_default_controllers);
1555 manager_set_show_status(m, arg_show_status);
1557 before_startup = now(CLOCK_MONOTONIC);
1559 r = manager_startup(m, serialization, fds);
1561 log_error("Failed to fully start up daemon: %s", strerror(-r));
1564 /* This will close all file descriptors that were opened, but
1565 * not claimed by any unit. */
1571 if (serialization) {
1572 fclose(serialization);
1573 serialization = NULL;
1576 Unit *target = NULL;
1577 Job *default_unit_job;
1579 dbus_error_init(&error);
1581 log_debug("Activating default unit: %s", arg_default_unit);
1583 r = manager_load_unit(m, arg_default_unit, NULL, &error, &target);
1585 log_error("Failed to load default target: %s", bus_error(&error, r));
1586 dbus_error_free(&error);
1587 } else if (target->load_state == UNIT_ERROR)
1588 log_error("Failed to load default target: %s", strerror(-target->load_error));
1589 else if (target->load_state == UNIT_MASKED)
1590 log_error("Default target masked.");
1592 if (!target || target->load_state != UNIT_LOADED) {
1593 log_info("Trying to load rescue target...");
1595 r = manager_load_unit(m, SPECIAL_RESCUE_TARGET, NULL, &error, &target);
1597 log_error("Failed to load rescue target: %s", bus_error(&error, r));
1598 dbus_error_free(&error);
1600 } else if (target->load_state == UNIT_ERROR) {
1601 log_error("Failed to load rescue target: %s", strerror(-target->load_error));
1603 } else if (target->load_state == UNIT_MASKED) {
1604 log_error("Rescue target masked.");
1609 assert(target->load_state == UNIT_LOADED);
1611 if (arg_action == ACTION_TEST) {
1612 printf("-> By units:\n");
1613 manager_dump_units(m, stdout, "\t");
1616 r = manager_add_job(m, JOB_START, target, JOB_REPLACE, false, &error, &default_unit_job);
1618 log_error("Failed to start default target: %s", bus_error(&error, r));
1619 dbus_error_free(&error);
1622 m->default_unit_job_id = default_unit_job->id;
1624 after_startup = now(CLOCK_MONOTONIC);
1625 log_full(arg_action == ACTION_TEST ? LOG_INFO : LOG_DEBUG,
1626 "Loaded units and determined initial transaction in %s.",
1627 format_timespan(timespan, sizeof(timespan), after_startup - before_startup));
1629 if (arg_action == ACTION_TEST) {
1630 printf("-> By jobs:\n");
1631 manager_dump_jobs(m, stdout, "\t");
1632 retval = EXIT_SUCCESS;
1638 r = manager_loop(m);
1640 log_error("Failed to run mainloop: %s", strerror(-r));
1644 switch (m->exit_code) {
1647 retval = EXIT_SUCCESS;
1651 case MANAGER_RELOAD:
1652 log_info("Reloading.");
1653 r = manager_reload(m);
1655 log_error("Failed to reload: %s", strerror(-r));
1658 case MANAGER_REEXECUTE:
1660 if (prepare_reexecute(m, &serialization, &fds) < 0)
1664 log_notice("Reexecuting.");
1667 case MANAGER_SWITCH_ROOT:
1668 /* Steal the switch root parameters */
1669 switch_root = m->switch_root;
1670 switch_root_init = m->switch_root_init;
1671 m->switch_root = m->switch_root_init = NULL;
1673 if (!switch_root_init)
1674 if (prepare_reexecute(m, &serialization, &fds) < 0)
1678 log_notice("Switching root.");
1681 case MANAGER_REBOOT:
1682 case MANAGER_POWEROFF:
1684 case MANAGER_KEXEC: {
1685 static const char * const table[_MANAGER_EXIT_CODE_MAX] = {
1686 [MANAGER_REBOOT] = "reboot",
1687 [MANAGER_POWEROFF] = "poweroff",
1688 [MANAGER_HALT] = "halt",
1689 [MANAGER_KEXEC] = "kexec"
1692 assert_se(shutdown_verb = table[m->exit_code]);
1693 arm_reboot_watchdog = m->exit_code == MANAGER_REBOOT;
1695 log_notice("Shutting down.");
1700 assert_not_reached("Unknown exit code.");
1708 free(arg_default_unit);
1709 strv_free(arg_default_controllers);
1710 free_join_controllers();
1717 unsigned i, args_size;
1719 /* Close and disarm the watchdog, so that the new
1720 * instance can reinitialize it, but doesn't get
1721 * rebooted while we do that */
1722 watchdog_close(true);
1725 do_switch_root(switch_root);
1727 args_size = MAX(6, argc+1);
1728 args = newa(const char*, args_size);
1730 if (!switch_root_init) {
1733 /* First try to spawn ourselves with the right
1734 * path, and with full serialization. We do
1735 * this only if the user didn't specify an
1736 * explicit init to spawn. */
1738 assert(serialization);
1741 snprintf(sfd, sizeof(sfd), "%i", fileno(serialization));
1745 args[i++] = SYSTEMD_BINARY_PATH;
1747 args[i++] = "--switchedroot";
1748 args[i++] = arg_running_as == MANAGER_SYSTEM ? "--system" : "--user";
1749 args[i++] = "--deserialize";
1753 assert(i <= args_size);
1754 execv(args[0], (char* const*) args);
1757 /* Try the fallback, if there is any, without any
1758 * serialization. We pass the original argv[] and
1759 * envp[]. (Well, modulo the ordering changes due to
1760 * getopt() in argv[], and some cleanups in envp[],
1761 * but let's hope that doesn't matter.) */
1763 if (serialization) {
1764 fclose(serialization);
1765 serialization = NULL;
1773 for (j = 1, i = 1; j < argc; j++)
1774 args[i++] = argv[j];
1776 assert(i <= args_size);
1778 if (switch_root_init) {
1779 args[0] = switch_root_init;
1780 execv(args[0], (char* const*) args);
1781 log_warning("Failed to execute configured init, trying fallback: %m");
1784 args[0] = "/sbin/init";
1785 execv(args[0], (char* const*) args);
1787 log_warning("Failed to execute /sbin/init, trying fallback: %m");
1789 args[0] = "/bin/sh";
1791 execv(args[0], (char* const*) args);
1792 log_error("Failed to execute /bin/sh, giving up: %m");
1796 fclose(serialization);
1801 if (shutdown_verb) {
1802 const char * command_line[] = {
1803 SYSTEMD_SHUTDOWN_BINARY_PATH,
1809 if (arm_reboot_watchdog && arg_shutdown_watchdog > 0) {
1812 /* If we reboot let's set the shutdown
1813 * watchdog and tell the shutdown binary to
1814 * repeatedly ping it */
1815 watchdog_set_timeout(&arg_shutdown_watchdog);
1816 watchdog_close(false);
1818 /* Tell the binary how often to ping */
1819 snprintf(e, sizeof(e), "WATCHDOG_USEC=%llu", (unsigned long long) arg_shutdown_watchdog);
1822 env_block = strv_append(environ, e);
1824 env_block = strv_copy(environ);
1825 watchdog_close(true);
1828 execve(SYSTEMD_SHUTDOWN_BINARY_PATH, (char **) command_line, env_block);
1830 log_error("Failed to execute shutdown binary, freezing: %m");