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>
38 #include "load-fragment.h"
41 #include "conf-parser.h"
42 #include "bus-errors.h"
51 #include "mount-setup.h"
52 #include "loopback-setup.h"
53 #include "kmod-setup.h"
54 #include "hostname-setup.h"
55 #include "machine-id-setup.h"
56 #include "locale-setup.h"
58 #include "selinux-setup.h"
59 #include "ima-setup.h"
65 ACTION_DUMP_CONFIGURATION_ITEMS,
67 } arg_action = ACTION_RUN;
69 static char *arg_default_unit = NULL;
70 static ManagerRunningAs arg_running_as = _MANAGER_RUNNING_AS_INVALID;
72 static bool arg_dump_core = true;
73 static bool arg_crash_shell = false;
74 static int arg_crash_chvt = -1;
75 static bool arg_confirm_spawn = false;
76 static bool arg_show_status = true;
77 #ifdef HAVE_SYSV_COMPAT
78 static bool arg_sysv_console = true;
80 static char **arg_default_controllers = NULL;
81 static char ***arg_join_controllers = NULL;
82 static ExecOutput arg_default_std_output = EXEC_OUTPUT_JOURNAL;
83 static ExecOutput arg_default_std_error = EXEC_OUTPUT_INHERIT;
84 static usec_t arg_runtime_watchdog = 0;
85 static usec_t arg_shutdown_watchdog = 10 * USEC_PER_MINUTE;
87 static FILE* serialization = NULL;
89 static void nop_handler(int sig) {
92 _noreturn_ static void crash(int sig) {
95 log_error("Caught <%s>, not dumping core.", signal_to_string(sig));
100 /* We want to wait for the core process, hence let's enable SIGCHLD */
102 sa.sa_handler = nop_handler;
103 sa.sa_flags = SA_NOCLDSTOP|SA_RESTART;
104 assert_se(sigaction(SIGCHLD, &sa, NULL) == 0);
106 if ((pid = fork()) < 0)
107 log_error("Caught <%s>, cannot fork for core dump: %s", signal_to_string(sig), strerror(errno));
112 /* Enable default signal handler for core dump */
114 sa.sa_handler = SIG_DFL;
115 assert_se(sigaction(sig, &sa, NULL) == 0);
117 /* Don't limit the core dump size */
119 rl.rlim_cur = RLIM_INFINITY;
120 rl.rlim_max = RLIM_INFINITY;
121 setrlimit(RLIMIT_CORE, &rl);
123 /* Just to be sure... */
124 assert_se(chdir("/") == 0);
126 /* Raise the signal again */
129 assert_not_reached("We shouldn't be here...");
136 /* Order things nicely. */
137 if ((r = wait_for_terminate(pid, &status)) < 0)
138 log_error("Caught <%s>, waitpid() failed: %s", signal_to_string(sig), strerror(-r));
139 else if (status.si_code != CLD_DUMPED)
140 log_error("Caught <%s>, core dump failed.", signal_to_string(sig));
142 log_error("Caught <%s>, dumped core as pid %lu.", signal_to_string(sig), (unsigned long) pid);
147 chvt(arg_crash_chvt);
149 if (arg_crash_shell) {
153 log_info("Executing crash shell in 10s...");
156 /* Let the kernel reap children for us */
158 sa.sa_handler = SIG_IGN;
159 sa.sa_flags = SA_NOCLDSTOP|SA_NOCLDWAIT|SA_RESTART;
160 assert_se(sigaction(SIGCHLD, &sa, NULL) == 0);
162 if ((pid = fork()) < 0)
163 log_error("Failed to fork off crash shell: %s", strerror(errno));
167 if ((fd = acquire_terminal("/dev/console", false, true, true)) < 0)
168 log_error("Failed to acquire terminal: %s", strerror(-fd));
169 else if ((r = make_stdio(fd)) < 0)
170 log_error("Failed to duplicate terminal fd: %s", strerror(-r));
172 execl("/bin/sh", "/bin/sh", NULL);
174 log_error("execl() failed: %s", strerror(errno));
178 log_info("Successfully spawned crash shell as pid %lu.", (unsigned long) pid);
181 log_info("Freezing execution.");
185 static void install_crash_handler(void) {
190 sa.sa_handler = crash;
191 sa.sa_flags = SA_NODEFER;
193 sigaction_many(&sa, SIGNALS_CRASH_HANDLER, -1);
196 static int console_setup(bool do_reset) {
199 /* If we are init, we connect stdin/stdout/stderr to /dev/null
200 * and make sure we don't have a controlling tty. */
207 tty_fd = open_terminal("/dev/console", O_WRONLY|O_NOCTTY|O_CLOEXEC);
209 log_error("Failed to open /dev/console: %s", strerror(-tty_fd));
213 /* We don't want to force text mode.
214 * plymouth may be showing pictures already from initrd. */
215 r = reset_terminal_fd(tty_fd, false);
217 log_error("Failed to reset /dev/console: %s", strerror(-r));
219 close_nointr_nofail(tty_fd);
223 static int set_default_unit(const char *u) {
228 if (!(c = strdup(u)))
231 free(arg_default_unit);
232 arg_default_unit = c;
236 static int parse_proc_cmdline_word(const char *word) {
238 static const char * const rlmap[] = {
239 "emergency", SPECIAL_EMERGENCY_TARGET,
240 "-b", SPECIAL_EMERGENCY_TARGET,
241 "single", SPECIAL_RESCUE_TARGET,
242 "-s", SPECIAL_RESCUE_TARGET,
243 "s", SPECIAL_RESCUE_TARGET,
244 "S", SPECIAL_RESCUE_TARGET,
245 "1", SPECIAL_RESCUE_TARGET,
246 "2", SPECIAL_RUNLEVEL2_TARGET,
247 "3", SPECIAL_RUNLEVEL3_TARGET,
248 "4", SPECIAL_RUNLEVEL4_TARGET,
249 "5", SPECIAL_RUNLEVEL5_TARGET,
254 if (startswith(word, "systemd.unit="))
255 return set_default_unit(word + 13);
257 else if (startswith(word, "systemd.log_target=")) {
259 if (log_set_target_from_string(word + 19) < 0)
260 log_warning("Failed to parse log target %s. Ignoring.", word + 19);
262 } else if (startswith(word, "systemd.log_level=")) {
264 if (log_set_max_level_from_string(word + 18) < 0)
265 log_warning("Failed to parse log level %s. Ignoring.", word + 18);
267 } else if (startswith(word, "systemd.log_color=")) {
269 if (log_show_color_from_string(word + 18) < 0)
270 log_warning("Failed to parse log color setting %s. Ignoring.", word + 18);
272 } else if (startswith(word, "systemd.log_location=")) {
274 if (log_show_location_from_string(word + 21) < 0)
275 log_warning("Failed to parse log location setting %s. Ignoring.", word + 21);
277 } else if (startswith(word, "systemd.dump_core=")) {
280 if ((r = parse_boolean(word + 18)) < 0)
281 log_warning("Failed to parse dump core switch %s. Ignoring.", word + 18);
285 } else if (startswith(word, "systemd.crash_shell=")) {
288 if ((r = parse_boolean(word + 20)) < 0)
289 log_warning("Failed to parse crash shell switch %s. Ignoring.", word + 20);
293 } else if (startswith(word, "systemd.confirm_spawn=")) {
296 if ((r = parse_boolean(word + 22)) < 0)
297 log_warning("Failed to parse confirm spawn switch %s. Ignoring.", word + 22);
299 arg_confirm_spawn = r;
301 } else if (startswith(word, "systemd.crash_chvt=")) {
304 if (safe_atoi(word + 19, &k) < 0)
305 log_warning("Failed to parse crash chvt switch %s. Ignoring.", word + 19);
309 } else if (startswith(word, "systemd.show_status=")) {
312 if ((r = parse_boolean(word + 20)) < 0)
313 log_warning("Failed to parse show status switch %s. Ignoring.", word + 20);
316 } else if (startswith(word, "systemd.default_standard_output=")) {
319 if ((r = exec_output_from_string(word + 32)) < 0)
320 log_warning("Failed to parse default standard output switch %s. Ignoring.", word + 32);
322 arg_default_std_output = r;
323 } else if (startswith(word, "systemd.default_standard_error=")) {
326 if ((r = exec_output_from_string(word + 31)) < 0)
327 log_warning("Failed to parse default standard error switch %s. Ignoring.", word + 31);
329 arg_default_std_error = r;
330 } else if (startswith(word, "systemd.setenv=")) {
334 cenv = strdup(word + 15);
338 eq = strchr(cenv, '=');
342 log_warning("unsetenv failed %s. Ignoring.", strerror(errno));
345 r = setenv(cenv, eq + 1, 1);
347 log_warning("setenv failed %s. Ignoring.", strerror(errno));
350 #ifdef HAVE_SYSV_COMPAT
351 } else if (startswith(word, "systemd.sysv_console=")) {
354 if ((r = parse_boolean(word + 21)) < 0)
355 log_warning("Failed to parse SysV console switch %s. Ignoring.", word + 20);
357 arg_sysv_console = r;
360 } else if (startswith(word, "systemd.")) {
362 log_warning("Unknown kernel switch %s. Ignoring.", word);
364 log_info("Supported kernel switches:\n"
365 "systemd.unit=UNIT Default unit to start\n"
366 "systemd.dump_core=0|1 Dump core on crash\n"
367 "systemd.crash_shell=0|1 Run shell on crash\n"
368 "systemd.crash_chvt=N Change to VT #N on crash\n"
369 "systemd.confirm_spawn=0|1 Confirm every process spawn\n"
370 "systemd.show_status=0|1 Show status updates on the console during bootup\n"
371 #ifdef HAVE_SYSV_COMPAT
372 "systemd.sysv_console=0|1 Connect output of SysV scripts to console\n"
374 "systemd.log_target=console|kmsg|journal|journal-or-kmsg|syslog|syslog-or-kmsg|null\n"
376 "systemd.log_level=LEVEL Log level\n"
377 "systemd.log_color=0|1 Highlight important log messages\n"
378 "systemd.log_location=0|1 Include code location in log messages\n"
379 "systemd.default_standard_output=null|tty|syslog|syslog+console|kmsg|kmsg+console|journal|journal+console\n"
380 " Set default log output for services\n"
381 "systemd.default_standard_error=null|tty|syslog|syslog+console|kmsg|kmsg+console|journal|journal+console\n"
382 " Set default log error output for services\n");
384 } else if (streq(word, "quiet")) {
385 arg_show_status = false;
386 #ifdef HAVE_SYSV_COMPAT
387 arg_sysv_console = false;
392 /* SysV compatibility */
393 for (i = 0; i < ELEMENTSOF(rlmap); i += 2)
394 if (streq(word, rlmap[i]))
395 return set_default_unit(rlmap[i+1]);
401 static int config_parse_level2(
402 const char *filename,
415 log_set_max_level_from_string(rvalue);
419 static int config_parse_target(
420 const char *filename,
433 log_set_target_from_string(rvalue);
437 static int config_parse_color(
438 const char *filename,
451 log_show_color_from_string(rvalue);
455 static int config_parse_location(
456 const char *filename,
469 log_show_location_from_string(rvalue);
473 static int config_parse_cpu_affinity2(
474 const char *filename,
493 FOREACH_WORD_QUOTED(w, l, rvalue, state) {
498 if (!(t = strndup(w, l)))
501 r = safe_atou(t, &cpu);
505 if (!(c = cpu_set_malloc(&ncpus)))
508 if (r < 0 || cpu >= ncpus) {
509 log_error("[%s:%u] Failed to parse CPU affinity: %s", filename, line, rvalue);
514 CPU_SET_S(cpu, CPU_ALLOC_SIZE(ncpus), c);
518 if (sched_setaffinity(0, CPU_ALLOC_SIZE(ncpus), c) < 0)
519 log_warning("Failed to set CPU affinity: %m");
527 static void strv_free_free(char ***l) {
539 static void free_join_controllers(void) {
540 if (!arg_join_controllers)
543 strv_free_free(arg_join_controllers);
544 arg_join_controllers = NULL;
547 static int config_parse_join_controllers(
548 const char *filename,
565 free_join_controllers();
567 FOREACH_WORD_QUOTED(w, length, rvalue, state) {
570 s = strndup(w, length);
574 l = strv_split(s, ",");
579 if (strv_length(l) <= 1) {
584 if (!arg_join_controllers) {
585 arg_join_controllers = new(char**, 2);
586 if (!arg_join_controllers) {
591 arg_join_controllers[0] = l;
592 arg_join_controllers[1] = NULL;
599 t = new0(char**, n+2);
607 for (a = arg_join_controllers; *a; a++) {
609 if (strv_overlap(*a, l)) {
612 c = strv_merge(*a, l);
635 t[n++] = strv_uniq(l);
637 strv_free_free(arg_join_controllers);
638 arg_join_controllers = t;
645 static int parse_config_file(void) {
647 const ConfigTableItem items[] = {
648 { "Manager", "LogLevel", config_parse_level2, 0, NULL },
649 { "Manager", "LogTarget", config_parse_target, 0, NULL },
650 { "Manager", "LogColor", config_parse_color, 0, NULL },
651 { "Manager", "LogLocation", config_parse_location, 0, NULL },
652 { "Manager", "DumpCore", config_parse_bool, 0, &arg_dump_core },
653 { "Manager", "CrashShell", config_parse_bool, 0, &arg_crash_shell },
654 { "Manager", "ShowStatus", config_parse_bool, 0, &arg_show_status },
655 #ifdef HAVE_SYSV_COMPAT
656 { "Manager", "SysVConsole", config_parse_bool, 0, &arg_sysv_console },
658 { "Manager", "CrashChVT", config_parse_int, 0, &arg_crash_chvt },
659 { "Manager", "CPUAffinity", config_parse_cpu_affinity2, 0, NULL },
660 { "Manager", "DefaultControllers", config_parse_strv, 0, &arg_default_controllers },
661 { "Manager", "DefaultStandardOutput", config_parse_output, 0, &arg_default_std_output },
662 { "Manager", "DefaultStandardError", config_parse_output, 0, &arg_default_std_error },
663 { "Manager", "JoinControllers", config_parse_join_controllers, 0, &arg_join_controllers },
664 { "Manager", "RuntimeWatchdogSec", config_parse_usec, 0, &arg_runtime_watchdog },
665 { "Manager", "ShutdownWatchdogSec", config_parse_usec, 0, &arg_shutdown_watchdog },
666 { NULL, NULL, NULL, 0, NULL }
673 fn = arg_running_as == MANAGER_SYSTEM ? SYSTEM_CONFIG_FILE : USER_CONFIG_FILE;
679 log_warning("Failed to open configuration file '%s': %m", fn);
683 r = config_parse(fn, f, "Manager\0", config_item_table_lookup, (void*) items, false, NULL);
685 log_warning("Failed to parse configuration file: %s", strerror(-r));
692 static int parse_proc_cmdline(void) {
693 char *line, *w, *state;
697 /* Don't read /proc/cmdline if we are in a container, since
698 * that is only relevant for the host system */
699 if (detect_container(NULL) > 0)
702 if ((r = read_one_line_file("/proc/cmdline", &line)) < 0) {
703 log_warning("Failed to read /proc/cmdline, ignoring: %s", strerror(-r));
707 FOREACH_WORD_QUOTED(w, l, line, state) {
710 if (!(word = strndup(w, l))) {
715 r = parse_proc_cmdline_word(word);
729 static int parse_argv(int argc, char *argv[]) {
732 ARG_LOG_LEVEL = 0x100,
740 ARG_DUMP_CONFIGURATION_ITEMS,
748 ARG_DEFAULT_STD_OUTPUT,
749 ARG_DEFAULT_STD_ERROR
752 static const struct option options[] = {
753 { "log-level", required_argument, NULL, ARG_LOG_LEVEL },
754 { "log-target", required_argument, NULL, ARG_LOG_TARGET },
755 { "log-color", optional_argument, NULL, ARG_LOG_COLOR },
756 { "log-location", optional_argument, NULL, ARG_LOG_LOCATION },
757 { "unit", required_argument, NULL, ARG_UNIT },
758 { "system", no_argument, NULL, ARG_SYSTEM },
759 { "user", no_argument, NULL, ARG_USER },
760 { "test", no_argument, NULL, ARG_TEST },
761 { "help", no_argument, NULL, 'h' },
762 { "dump-configuration-items", no_argument, NULL, ARG_DUMP_CONFIGURATION_ITEMS },
763 { "dump-core", no_argument, NULL, ARG_DUMP_CORE },
764 { "crash-shell", no_argument, NULL, ARG_CRASH_SHELL },
765 { "confirm-spawn", no_argument, NULL, ARG_CONFIRM_SPAWN },
766 { "show-status", optional_argument, NULL, ARG_SHOW_STATUS },
767 #ifdef HAVE_SYSV_COMPAT
768 { "sysv-console", optional_argument, NULL, ARG_SYSV_CONSOLE },
770 { "deserialize", required_argument, NULL, ARG_DESERIALIZE },
771 { "introspect", optional_argument, NULL, ARG_INTROSPECT },
772 { "default-standard-output", required_argument, NULL, ARG_DEFAULT_STD_OUTPUT, },
773 { "default-standard-error", required_argument, NULL, ARG_DEFAULT_STD_ERROR, },
785 while ((c = getopt_long(argc, argv, "hDbsz:", options, NULL)) >= 0)
790 if ((r = log_set_max_level_from_string(optarg)) < 0) {
791 log_error("Failed to parse log level %s.", optarg);
799 if ((r = log_set_target_from_string(optarg)) < 0) {
800 log_error("Failed to parse log target %s.", optarg);
809 if ((r = log_show_color_from_string(optarg)) < 0) {
810 log_error("Failed to parse log color setting %s.", optarg);
814 log_show_color(true);
818 case ARG_LOG_LOCATION:
821 if ((r = log_show_location_from_string(optarg)) < 0) {
822 log_error("Failed to parse log location setting %s.", optarg);
826 log_show_location(true);
830 case ARG_DEFAULT_STD_OUTPUT:
832 if ((r = exec_output_from_string(optarg)) < 0) {
833 log_error("Failed to parse default standard output setting %s.", optarg);
836 arg_default_std_output = r;
839 case ARG_DEFAULT_STD_ERROR:
841 if ((r = exec_output_from_string(optarg)) < 0) {
842 log_error("Failed to parse default standard error output setting %s.", optarg);
845 arg_default_std_error = r;
850 if ((r = set_default_unit(optarg)) < 0) {
851 log_error("Failed to set default unit %s: %s", optarg, strerror(-r));
858 arg_running_as = MANAGER_SYSTEM;
862 arg_running_as = MANAGER_USER;
866 arg_action = ACTION_TEST;
869 case ARG_DUMP_CONFIGURATION_ITEMS:
870 arg_action = ACTION_DUMP_CONFIGURATION_ITEMS;
874 arg_dump_core = true;
877 case ARG_CRASH_SHELL:
878 arg_crash_shell = true;
881 case ARG_CONFIRM_SPAWN:
882 arg_confirm_spawn = true;
885 case ARG_SHOW_STATUS:
888 if ((r = parse_boolean(optarg)) < 0) {
889 log_error("Failed to show status boolean %s.", optarg);
894 arg_show_status = true;
896 #ifdef HAVE_SYSV_COMPAT
897 case ARG_SYSV_CONSOLE:
900 if ((r = parse_boolean(optarg)) < 0) {
901 log_error("Failed to SysV console boolean %s.", optarg);
904 arg_sysv_console = r;
906 arg_sysv_console = true;
910 case ARG_DESERIALIZE: {
914 if ((r = safe_atoi(optarg, &fd)) < 0 || fd < 0) {
915 log_error("Failed to parse deserialize option %s.", optarg);
919 if (!(f = fdopen(fd, "r"))) {
920 log_error("Failed to open serialization fd: %m");
925 fclose(serialization);
932 case ARG_INTROSPECT: {
933 const char * const * i = NULL;
935 for (i = bus_interface_table; *i; i += 2)
936 if (!optarg || streq(i[0], optarg)) {
937 fputs(DBUS_INTROSPECT_1_0_XML_DOCTYPE_DECL_NODE
940 fputs("</node>\n", stdout);
947 log_error("Unknown interface %s.", optarg);
949 arg_action = ACTION_DONE;
954 arg_action = ACTION_HELP;
958 log_set_max_level(LOG_DEBUG);
964 /* Just to eat away the sysvinit kernel
965 * cmdline args without getopt() error
966 * messages that we'll parse in
967 * parse_proc_cmdline_word() or ignore. */
972 log_error("Unknown option code %c", c);
979 if (optind < argc && getpid() != 1) {
980 /* Hmm, when we aren't run as init system
981 * let's complain about excess arguments */
983 log_error("Excess arguments.");
987 if (detect_container(NULL) > 0) {
990 /* All /proc/cmdline arguments the kernel didn't
991 * understand it passed to us. We're not really
992 * interested in that usually since /proc/cmdline is
993 * more interesting and complete. With one exception:
994 * if we are run in a container /proc/cmdline is not
995 * relevant for the container, hence we rely on argv[]
998 for (a = argv; a < argv + argc; a++)
999 if ((r = parse_proc_cmdline_word(*a)) < 0)
1006 static int help(void) {
1008 printf("%s [OPTIONS...]\n\n"
1009 "Starts up and maintains the system or user services.\n\n"
1010 " -h --help Show this help\n"
1011 " --test Determine startup sequence, dump it and exit\n"
1012 " --dump-configuration-items Dump understood unit configuration items\n"
1013 " --introspect[=INTERFACE] Extract D-Bus interface data\n"
1014 " --unit=UNIT Set default unit\n"
1015 " --system Run a system instance, even if PID != 1\n"
1016 " --user Run a user instance\n"
1017 " --dump-core Dump core on crash\n"
1018 " --crash-shell Run shell on crash\n"
1019 " --confirm-spawn Ask for confirmation when spawning processes\n"
1020 " --show-status[=0|1] Show status updates on the console during bootup\n"
1021 #ifdef HAVE_SYSV_COMPAT
1022 " --sysv-console[=0|1] Connect output of SysV scripts to console\n"
1024 " --log-target=TARGET Set log target (console, journal, syslog, kmsg, journal-or-kmsg, syslog-or-kmsg, null)\n"
1025 " --log-level=LEVEL Set log level (debug, info, notice, warning, err, crit, alert, emerg)\n"
1026 " --log-color[=0|1] Highlight important log messages\n"
1027 " --log-location[=0|1] Include code location in log messages\n"
1028 " --default-standard-output= Set default standard output for services\n"
1029 " --default-standard-error= Set default standard error output for services\n",
1030 program_invocation_short_name);
1035 static int prepare_reexecute(Manager *m, FILE **_f, FDSet **_fds) {
1044 /* Make sure nothing is really destructed when we shut down */
1047 if ((r = manager_open_serialization(m, &f)) < 0) {
1048 log_error("Failed to create serialization file: %s", strerror(-r));
1052 if (!(fds = fdset_new())) {
1054 log_error("Failed to allocate fd set: %s", strerror(-r));
1058 if ((r = manager_serialize(m, f, fds)) < 0) {
1059 log_error("Failed to serialize state: %s", strerror(-r));
1063 if (fseeko(f, 0, SEEK_SET) < 0) {
1064 log_error("Failed to rewind serialization fd: %m");
1068 if ((r = fd_cloexec(fileno(f), false)) < 0) {
1069 log_error("Failed to disable O_CLOEXEC for serialization: %s", strerror(-r));
1073 if ((r = fdset_cloexec(fds, false)) < 0) {
1074 log_error("Failed to disable O_CLOEXEC for serialization fds: %s", strerror(-r));
1092 static struct dual_timestamp* parse_initrd_timestamp(struct dual_timestamp *t) {
1094 unsigned long long a, b;
1098 e = getenv("RD_TIMESTAMP");
1102 if (sscanf(e, "%llu %llu", &a, &b) != 2)
1105 t->realtime = (usec_t) a;
1106 t->monotonic = (usec_t) b;
1111 static void test_mtab(void) {
1114 /* Check that /etc/mtab is a symlink */
1116 if (readlink_malloc("/etc/mtab", &p) >= 0) {
1119 b = streq(p, "/proc/self/mounts") || streq(p, "/proc/mounts");
1126 log_warning("/etc/mtab is not a symlink or not pointing to /proc/self/mounts. "
1127 "This is not supported anymore. "
1128 "Please make sure to replace this file by a symlink to avoid incorrect or misleading mount(8) output.");
1131 static void test_usr(void) {
1133 /* Check that /usr is not a separate fs */
1135 if (dir_is_empty("/usr") <= 0)
1138 log_warning("/usr appears to be on its own filesytem and is not already mounted. This is not a supported setup. "
1139 "Some things will probably break (sometimes even silently) in mysterious ways. "
1140 "Consult http://freedesktop.org/wiki/Software/systemd/separate-usr-is-broken for more information.");
1143 static void test_cgroups(void) {
1145 if (access("/proc/cgroups", F_OK) >= 0)
1148 log_warning("CONFIG_CGROUPS was not set when your kernel was compiled. "
1149 "Systems without control groups are not supported. "
1150 "We will now sleep for 10s, and then continue boot-up. "
1151 "Expect breakage and please do not file bugs. "
1152 "Instead fix your kernel and enable CONFIG_CGROUPS. "
1153 "Consult http://0pointer.de/blog/projects/cgroups-vs-cgroups.html for more information.");
1158 int main(int argc, char *argv[]) {
1160 int r, retval = EXIT_FAILURE;
1161 usec_t before_startup, after_startup;
1162 char timespan[FORMAT_TIMESPAN_MAX];
1164 bool reexecute = false;
1165 const char *shutdown_verb = NULL;
1166 dual_timestamp initrd_timestamp = { 0ULL, 0ULL };
1167 static char systemd[] = "systemd";
1168 bool is_reexec = false;
1170 bool loaded_policy = false;
1171 bool arm_reboot_watchdog = false;
1173 #ifdef HAVE_SYSV_COMPAT
1174 if (getpid() != 1 && strstr(program_invocation_short_name, "init")) {
1175 /* This is compatibility support for SysV, where
1176 * calling init as a user is identical to telinit. */
1179 execv(SYSTEMCTL_BINARY_PATH, argv);
1180 log_error("Failed to exec " SYSTEMCTL_BINARY_PATH ": %m");
1185 /* Determine if this is a reexecution or normal bootup. We do
1186 * the full command line parsing much later, so let's just
1187 * have a quick peek here. */
1189 for (j = 1; j < argc; j++)
1190 if (streq(argv[j], "--deserialize")) {
1195 /* If we get started via the /sbin/init symlink then we are
1196 called 'init'. After a subsequent reexecution we are then
1197 called 'systemd'. That is confusing, hence let's call us
1198 systemd right-away. */
1199 program_invocation_short_name = systemd;
1200 prctl(PR_SET_NAME, systemd);
1205 log_show_color(isatty(STDERR_FILENO) > 0);
1206 log_show_location(false);
1207 log_set_max_level(LOG_INFO);
1209 if (getpid() == 1) {
1210 arg_running_as = MANAGER_SYSTEM;
1211 log_set_target(detect_container(NULL) > 0 ? LOG_TARGET_JOURNAL : LOG_TARGET_JOURNAL_OR_KMSG);
1214 if (selinux_setup(&loaded_policy) < 0)
1216 if (ima_setup() < 0)
1222 if (label_init(NULL) < 0)
1226 if (hwclock_is_localtime() > 0) {
1229 r = hwclock_apply_localtime_delta(&min);
1231 log_error("Failed to apply local time delta, ignoring: %s", strerror(-r));
1233 log_info("RTC configured in localtime, applying delta of %i minutes to system time.", min);
1237 arg_running_as = MANAGER_USER;
1238 log_set_target(LOG_TARGET_AUTO);
1242 /* Initialize default unit */
1243 if (set_default_unit(SPECIAL_DEFAULT_TARGET) < 0)
1246 /* By default, mount "cpu" and "cpuacct" together */
1247 arg_join_controllers = new(char**, 2);
1248 if (!arg_join_controllers)
1251 arg_join_controllers[0] = strv_new("cpu", "cpuacct", NULL);
1252 arg_join_controllers[1] = NULL;
1254 if (!arg_join_controllers[0])
1257 /* Mount /proc, /sys and friends, so that /proc/cmdline and
1258 * /proc/$PID/fd is available. */
1259 if (geteuid() == 0 && !getenv("SYSTEMD_SKIP_API_MOUNTS")) {
1260 r = mount_setup(loaded_policy);
1265 /* Reset all signal handlers. */
1266 assert_se(reset_all_signal_handlers() == 0);
1268 /* If we are init, we can block sigkill. Yay. */
1269 ignore_signals(SIGNALS_IGNORE, -1);
1271 if (parse_config_file() < 0)
1274 if (arg_running_as == MANAGER_SYSTEM)
1275 if (parse_proc_cmdline() < 0)
1278 log_parse_environment();
1280 if (parse_argv(argc, argv) < 0)
1283 if (arg_action == ACTION_TEST && geteuid() == 0) {
1284 log_error("Don't run test mode as root.");
1288 if (arg_running_as == MANAGER_SYSTEM &&
1289 arg_action == ACTION_RUN &&
1290 running_in_chroot() > 0) {
1291 log_error("Cannot be run in a chroot() environment.");
1295 if (arg_action == ACTION_HELP) {
1298 } else if (arg_action == ACTION_DUMP_CONFIGURATION_ITEMS) {
1299 unit_dump_config_items(stdout);
1300 retval = EXIT_SUCCESS;
1302 } else if (arg_action == ACTION_DONE) {
1303 retval = EXIT_SUCCESS;
1307 assert_se(arg_action == ACTION_RUN || arg_action == ACTION_TEST);
1309 /* Close logging fds, in order not to confuse fdset below */
1312 /* Remember open file descriptors for later deserialization */
1313 if (serialization) {
1314 r = fdset_new_fill(&fds);
1316 log_error("Failed to allocate fd set: %s", strerror(-r));
1320 assert_se(fdset_remove(fds, fileno(serialization)) >= 0);
1322 close_all_fds(NULL, 0);
1324 /* Set up PATH unless it is already set */
1326 #ifdef HAVE_SPLIT_USR
1327 "/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin",
1329 "/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin",
1331 arg_running_as == MANAGER_SYSTEM);
1333 if (arg_running_as == MANAGER_SYSTEM) {
1334 /* Parse the data passed to us. We leave this
1335 * variables set, but the manager later on will not
1336 * pass them on to our children. */
1337 parse_initrd_timestamp(&initrd_timestamp);
1339 /* Unset some environment variables passed in from the
1340 * kernel that don't really make sense for us. */
1344 /* When we are invoked by a shell, these might be set,
1345 * but make little sense to pass on */
1350 /* When we are invoked by a tool chroot-like such as
1351 * nspawn, these might be set, but make little sense
1354 unsetenv("LOGNAME");
1356 /* All other variables are left as is, so that clients
1357 * can still read them via /proc/1/environ */
1360 /* Move out of the way, so that we won't block unmounts */
1361 assert_se(chdir("/") == 0);
1363 if (arg_running_as == MANAGER_SYSTEM) {
1364 /* Become a session leader if we aren't one yet. */
1367 /* Disable the umask logic */
1371 /* Make sure D-Bus doesn't fiddle with the SIGPIPE handlers */
1372 dbus_connection_set_change_sigpipe(FALSE);
1374 /* Reset the console, but only if this is really init and we
1375 * are freshly booted */
1376 if (arg_running_as == MANAGER_SYSTEM && arg_action == ACTION_RUN) {
1377 console_setup(getpid() == 1 && !is_reexec);
1381 /* Open the logging devices, if possible and necessary */
1384 /* Make sure we leave a core dump without panicing the
1387 install_crash_handler();
1389 if (geteuid() == 0 && !getenv("SYSTEMD_SKIP_API_MOUNTS")) {
1390 r = mount_cgroup_controllers(arg_join_controllers);
1395 log_full(arg_running_as == MANAGER_SYSTEM ? LOG_INFO : LOG_DEBUG,
1396 PACKAGE_STRING " running in %s mode. (" SYSTEMD_FEATURES "; " DISTRIBUTION ")", manager_running_as_to_string(arg_running_as));
1398 if (arg_running_as == MANAGER_SYSTEM && !is_reexec) {
1401 if (arg_show_status || plymouth_running())
1414 if (arg_running_as == MANAGER_SYSTEM && arg_runtime_watchdog > 0)
1415 watchdog_set_timeout(&arg_runtime_watchdog);
1417 r = manager_new(arg_running_as, &m);
1419 log_error("Failed to allocate manager object: %s", strerror(-r));
1423 m->confirm_spawn = arg_confirm_spawn;
1424 #ifdef HAVE_SYSV_COMPAT
1425 m->sysv_console = arg_sysv_console;
1427 m->default_std_output = arg_default_std_output;
1428 m->default_std_error = arg_default_std_error;
1429 m->runtime_watchdog = arg_runtime_watchdog;
1430 m->shutdown_watchdog = arg_shutdown_watchdog;
1432 if (dual_timestamp_is_set(&initrd_timestamp))
1433 m->initrd_timestamp = initrd_timestamp;
1435 if (arg_default_controllers)
1436 manager_set_default_controllers(m, arg_default_controllers);
1438 manager_set_show_status(m, arg_show_status);
1440 before_startup = now(CLOCK_MONOTONIC);
1442 r = manager_startup(m, serialization, fds);
1444 log_error("Failed to fully start up daemon: %s", strerror(-r));
1447 /* This will close all file descriptors that were opened, but
1448 * not claimed by any unit. */
1454 if (serialization) {
1455 fclose(serialization);
1456 serialization = NULL;
1459 Unit *target = NULL;
1460 Job *default_unit_job;
1462 dbus_error_init(&error);
1464 log_debug("Activating default unit: %s", arg_default_unit);
1466 r = manager_load_unit(m, arg_default_unit, NULL, &error, &target);
1468 log_error("Failed to load default target: %s", bus_error(&error, r));
1469 dbus_error_free(&error);
1470 } else if (target->load_state == UNIT_ERROR)
1471 log_error("Failed to load default target: %s", strerror(-target->load_error));
1472 else if (target->load_state == UNIT_MASKED)
1473 log_error("Default target masked.");
1475 if (!target || target->load_state != UNIT_LOADED) {
1476 log_info("Trying to load rescue target...");
1478 r = manager_load_unit(m, SPECIAL_RESCUE_TARGET, NULL, &error, &target);
1480 log_error("Failed to load rescue target: %s", bus_error(&error, r));
1481 dbus_error_free(&error);
1483 } else if (target->load_state == UNIT_ERROR) {
1484 log_error("Failed to load rescue target: %s", strerror(-target->load_error));
1486 } else if (target->load_state == UNIT_MASKED) {
1487 log_error("Rescue target masked.");
1492 assert(target->load_state == UNIT_LOADED);
1494 if (arg_action == ACTION_TEST) {
1495 printf("-> By units:\n");
1496 manager_dump_units(m, stdout, "\t");
1499 r = manager_add_job(m, JOB_START, target, JOB_REPLACE, false, &error, &default_unit_job);
1501 log_error("Failed to start default target: %s", bus_error(&error, r));
1502 dbus_error_free(&error);
1505 m->default_unit_job_id = default_unit_job->id;
1507 after_startup = now(CLOCK_MONOTONIC);
1508 log_full(arg_action == ACTION_TEST ? LOG_INFO : LOG_DEBUG,
1509 "Loaded units and determined initial transaction in %s.",
1510 format_timespan(timespan, sizeof(timespan), after_startup - before_startup));
1512 if (arg_action == ACTION_TEST) {
1513 printf("-> By jobs:\n");
1514 manager_dump_jobs(m, stdout, "\t");
1515 retval = EXIT_SUCCESS;
1521 r = manager_loop(m);
1523 log_error("Failed to run mainloop: %s", strerror(-r));
1527 switch (m->exit_code) {
1530 retval = EXIT_SUCCESS;
1534 case MANAGER_RELOAD:
1535 log_info("Reloading.");
1536 r = manager_reload(m);
1538 log_error("Failed to reload: %s", strerror(-r));
1541 case MANAGER_REEXECUTE:
1542 if (prepare_reexecute(m, &serialization, &fds) < 0)
1546 log_notice("Reexecuting.");
1549 case MANAGER_REBOOT:
1550 case MANAGER_POWEROFF:
1552 case MANAGER_KEXEC: {
1553 static const char * const table[_MANAGER_EXIT_CODE_MAX] = {
1554 [MANAGER_REBOOT] = "reboot",
1555 [MANAGER_POWEROFF] = "poweroff",
1556 [MANAGER_HALT] = "halt",
1557 [MANAGER_KEXEC] = "kexec"
1560 assert_se(shutdown_verb = table[m->exit_code]);
1561 arm_reboot_watchdog = m->exit_code == MANAGER_REBOOT;
1563 log_notice("Shutting down.");
1568 assert_not_reached("Unknown exit code.");
1576 free(arg_default_unit);
1577 strv_free(arg_default_controllers);
1578 free_join_controllers();
1585 const char *args[15];
1589 assert(serialization);
1592 args[i++] = SYSTEMD_BINARY_PATH;
1594 args[i++] = "--log-level";
1595 args[i++] = log_level_to_string(log_get_max_level());
1597 args[i++] = "--log-target";
1598 args[i++] = log_target_to_string(log_get_target());
1600 if (arg_running_as == MANAGER_SYSTEM)
1601 args[i++] = "--system";
1603 args[i++] = "--user";
1606 args[i++] = "--dump-core";
1608 if (arg_crash_shell)
1609 args[i++] = "--crash-shell";
1611 if (arg_confirm_spawn)
1612 args[i++] = "--confirm-spawn";
1614 if (arg_show_status)
1615 args[i++] = "--show-status=1";
1617 args[i++] = "--show-status=0";
1619 #ifdef HAVE_SYSV_COMPAT
1620 if (arg_sysv_console)
1621 args[i++] = "--sysv-console=1";
1623 args[i++] = "--sysv-console=0";
1626 snprintf(sfd, sizeof(sfd), "%i", fileno(serialization));
1629 args[i++] = "--deserialize";
1634 assert(i <= ELEMENTSOF(args));
1636 /* Close and disarm the watchdog, so that the new
1637 * instance can reinitialize it, but doesn't get
1638 * rebooted while we do that */
1639 watchdog_close(true);
1641 execv(args[0], (char* const*) args);
1643 log_error("Failed to reexecute: %m");
1647 fclose(serialization);
1652 if (shutdown_verb) {
1653 const char * command_line[] = {
1654 SYSTEMD_SHUTDOWN_BINARY_PATH,
1660 if (arm_reboot_watchdog && arg_shutdown_watchdog > 0) {
1663 /* If we reboot let's set the shutdown
1664 * watchdog and tell the shutdown binary to
1665 * repeatedly ping it */
1666 watchdog_set_timeout(&arg_shutdown_watchdog);
1667 watchdog_close(false);
1669 /* Tell the binary how often to ping */
1670 snprintf(e, sizeof(e), "WATCHDOG_USEC=%llu", (unsigned long long) arg_shutdown_watchdog);
1673 env_block = strv_append(environ, e);
1675 env_block = strv_copy(environ);
1676 watchdog_close(true);
1679 execve(SYSTEMD_SHUTDOWN_BINARY_PATH, (char **) command_line, env_block);
1681 log_error("Failed to execute shutdown binary, freezing: %m");