[thirdparty/systemd.git] / main.c

/*-*- Mode: C; c-basic-offset: 8 -*-*/

/***
  This file is part of systemd.

  Copyright 2010 Lennart Poettering

  systemd is free software; you can redistribute it and/or modify it
  under the terms of the GNU General Public License as published by
  the Free Software Foundation; either version 2 of the License, or
  (at your option) any later version.

  systemd is distributed in the hope that it will be useful, but
  WITHOUT ANY WARRANTY; without even the implied warranty of
  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  General Public License for more details.

  You should have received a copy of the GNU General Public License
  along with systemd; If not, see <http://www.gnu.org/licenses/>.
***/

#include <dbus/dbus.h>

#include <stdio.h>
#include <errno.h>
#include <string.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <getopt.h>
#include <signal.h>
#include <sys/wait.h>

#include "manager.h"
#include "log.h"
#include "mount-setup.h"
#include "hostname-setup.h"
#include "load-fragment.h"

static enum {
        ACTION_RUN,
        ACTION_HELP,
        ACTION_TEST,
        ACTION_DUMP_CONFIGURATION_ITEMS
} action = ACTION_RUN;

static char *default_unit = NULL;
static ManagerRunningAs running_as = _MANAGER_RUNNING_AS_INVALID;

static bool dump_core = true;
static bool crash_shell = false;
static int crash_chvt = -1;

_noreturn static void freeze(void) {
        for (;;)
                pause();
}

_noreturn static void crash(int sig) {

        if (!dump_core)
                log_error("Caught <%s>, not dumping core.", strsignal(sig));
        else {
                pid_t pid;

                if ((pid = fork()) < 0)
                        log_error("Caught <%s>, cannot fork for core dump: %s", strsignal(sig), strerror(errno));

                else if (pid == 0) {
                        struct sigaction sa;
                        struct rlimit rl;

                        /* Enable default signal handler for core dump */
                        zero(sa);
                        sa.sa_handler = SIG_DFL;
                        assert_se(sigaction(sig, &sa, NULL) == 0);

                        /* Don't limit the core dump size */
                        zero(rl);
                        rl.rlim_cur = RLIM_INFINITY;
                        rl.rlim_max = RLIM_INFINITY;
                        setrlimit(RLIMIT_CORE, &rl);

                        /* Just to be sure... */
                        assert_se(chdir("/") == 0);

                        /* Raise the signal again */
                        raise(sig);

                        assert_not_reached("We shouldn't be here...");
                        _exit(1);

                } else {
                        int status, r;

                        /* Order things nicely. */
                        if ((r = waitpid(pid, &status, 0)) < 0)
                                log_error("Caught <%s>, waitpid() failed: %s", strsignal(sig), strerror(errno));
                        else if (!WCOREDUMP(status))
                                log_error("Caught <%s>, core dump failed.", strsignal(sig));
                        else
                                log_error("Caught <%s>, dumped core as pid %llu.", strsignal(sig), (unsigned long long) pid);
                }
        }

        if (crash_chvt)
                chvt(crash_chvt);

        if (crash_shell) {
                log_info("Executing crash shell in 10s...");
                sleep(10);

                execl("/bin/sh", "/bin/sh", NULL);
                log_error("execl() failed: %s", strerror(errno));
        }

        log_info("Freezing execution.");
        freeze();
}

static void install_crash_handler(void) {
        struct sigaction sa;

        zero(sa);

        sa.sa_handler = crash;
        sa.sa_flags = SA_NODEFER;

        assert_se(sigaction(SIGSEGV, &sa, NULL) == 0);
        assert_se(sigaction(SIGILL, &sa, NULL) == 0);
        assert_se(sigaction(SIGFPE, &sa, NULL) == 0);
        assert_se(sigaction(SIGBUS, &sa, NULL) == 0);
        assert_se(sigaction(SIGQUIT, &sa, NULL) == 0);
        assert_se(sigaction(SIGABRT, &sa, NULL) == 0);
}

static int set_default_unit(const char *u) {
        char *c;

        assert(u);

        if (!(c = strdup(u)))
                return -ENOMEM;

        free(default_unit);
        default_unit = c;
        return 0;
}

static int parse_proc_cmdline_word(const char *word) {

        static const char * const rlmap[] = {
                "single", SPECIAL_RUNLEVEL1_TARGET,
                "-s",     SPECIAL_RUNLEVEL1_TARGET,
                "s",      SPECIAL_RUNLEVEL1_TARGET,
                "S",      SPECIAL_RUNLEVEL1_TARGET,
                "1",      SPECIAL_RUNLEVEL1_TARGET,
                "2",      SPECIAL_RUNLEVEL2_TARGET,
                "3",      SPECIAL_RUNLEVEL3_TARGET,
                "4",      SPECIAL_RUNLEVEL4_TARGET,
                "5",      SPECIAL_RUNLEVEL5_TARGET
        };

        if (startswith(word, "systemd.default="))
                return set_default_unit(word + 16);

        else if (startswith(word, "systemd.log_target=")) {

                if (log_set_target_from_string(word + 19) < 0)
                        log_warning("Failed to parse log target %s. Ignoring.", word + 19);

        } else if (startswith(word, "systemd.log_level=")) {

                if (log_set_max_level_from_string(word + 18) < 0)
                        log_warning("Failed to parse log level %s. Ignoring.", word + 18);

        } else if (startswith(word, "systemd.dump_core=")) {
                int r;

                if ((r = parse_boolean(word + 18)) < 0)
                        log_warning("Failed to parse dump core switch %s, Ignoring.", word + 18);
                else
                        dump_core = r;

        } else if (startswith(word, "systemd.crash_shell=")) {
                int r;

                if ((r = parse_boolean(word + 20)) < 0)
                        log_warning("Failed to parse crash shell switch %s, Ignoring.", word + 20);
                else
                        crash_shell = r;

        } else if (startswith(word, "systemd.crash_chvt=")) {
                int k;

                if (safe_atoi(word + 19, &k) < 0)
                        log_warning("Failed to parse crash chvt switch %s, Ignoring.", word + 19);
                else
                        crash_chvt = k;

        } else if (startswith(word, "systemd.")) {

                log_warning("Unknown kernel switch %s. Ignoring.", word);

                log_info("Supported kernel switches:");
                log_info("systemd.default=UNIT                     Default unit to start");
                log_info("systemd.log_target=console|kmsg|syslog   Log target");
                log_info("systemd.log_level=LEVEL                  Log level");
                log_info("systemd.dump_core=0|1                    Dump core on crash");
                log_info("systemd.crash_shell=0|1                  On crash run shell");
                log_info("systemd.crash_chvt=N                     Change to VT #N on crash");

        } else {
                unsigned i;

                /* SysV compatibility */
                for (i = 0; i < ELEMENTSOF(rlmap); i += 2)
                        if (streq(word, rlmap[i]))
                                return set_default_unit(rlmap[i+1]);
        }

        return 0;
}

static int parse_proc_cmdline(void) {
        char *line;
        int r;
        char *w;
        size_t l;
        char *state;

        if ((r = read_one_line_file("/proc/cmdline", &line)) < 0) {
                log_warning("Failed to read /proc/cmdline, ignoring: %s", strerror(errno));
                return 0;
        }

        FOREACH_WORD_QUOTED(w, l, line, state) {
                char *word;

                if (!(word = strndup(w, l))) {
                        r = -ENOMEM;
                        goto finish;
                }

                r = parse_proc_cmdline_word(word);
                free(word);

                if (r < 0)
                        goto finish;
        }

        r = 0;

finish:
        free(line);
        return r;
}

static int parse_argv(int argc, char *argv[]) {

        enum {
                ARG_LOG_LEVEL = 0x100,
                ARG_LOG_TARGET,
                ARG_DEFAULT,
                ARG_RUNNING_AS,
                ARG_TEST,
                ARG_DUMP_CONFIGURATION_ITEMS
        };

        static const struct option options[] = {
                { "log-level",  required_argument, NULL, ARG_LOG_LEVEL },
                { "log-target", required_argument, NULL, ARG_LOG_TARGET },
                { "default",    required_argument, NULL, ARG_DEFAULT },
                { "running-as", required_argument, NULL, ARG_RUNNING_AS },
                { "test",       no_argument,       NULL, ARG_TEST },
                { "help",       no_argument,       NULL, 'h' },
                { "dump-configuration-items", no_argument, NULL, ARG_DUMP_CONFIGURATION_ITEMS },
                { NULL,         0,                 NULL, 0 }
        };

        int c, r;

        assert(argc >= 1);
        assert(argv);

        while ((c = getopt_long(argc, argv, "h", options, NULL)) >= 0)

                switch (c) {

                case ARG_LOG_LEVEL:
                        if ((r = log_set_max_level_from_string(optarg)) < 0) {
                                log_error("Failed to parse log level %s.", optarg);
                                return r;
                        }

                        break;

                case ARG_LOG_TARGET:

                        if ((r = log_set_target_from_string(optarg)) < 0) {
                                log_error("Failed to parse log target %s.", optarg);
                                return r;
                        }

                        break;

                case ARG_DEFAULT:

                        if ((r = set_default_unit(optarg)) < 0) {
                                log_error("Failed to set default unit %s: %s", optarg, strerror(-r));
                                return r;
                        }

                        break;

                case ARG_RUNNING_AS: {
                        ManagerRunningAs as;

                        if ((as = manager_running_as_from_string(optarg)) < 0) {
                                log_error("Failed to parse running as value %s", optarg);
                                return -EINVAL;
                        }

                        running_as = as;
                        break;
                }

                case ARG_TEST:
                        action = ACTION_TEST;
                        break;

                case ARG_DUMP_CONFIGURATION_ITEMS:
                        action = ACTION_DUMP_CONFIGURATION_ITEMS;
                        break;

                case 'h':
                        action = ACTION_HELP;
                        break;

                case '?':
                        return -EINVAL;

                default:
                        log_error("Unknown option code %c", c);
                        return -EINVAL;
                }

        return 0;
}

static int help(void) {

        printf("%s [options]\n\n"
               "  -h --help                      Show this help\n"
               "     --default=UNIT              Set default unit\n"
               "     --log-level=LEVEL           Set log level\n"
               "     --log-target=TARGET         Set log target (console, syslog, kmsg)\n"
               "     --running-as=AS             Set running as (init, system, session)\n"
               "     --test                      Determine startup sequence, dump it and exit\n"
               "     --dump-configuration-items  Dump understood unit configuration items\n",
               __progname);

        return 0;
}

int main(int argc, char *argv[]) {
        Manager *m = NULL;
        Unit *target = NULL;
        Job *job = NULL;
        int r, retval = 1;

        if (getpid() == 1)
                running_as = MANAGER_INIT;
        else if (getuid() == 0)
                running_as = MANAGER_SYSTEM;
        else
                running_as = MANAGER_SESSION;

        if (set_default_unit(SPECIAL_DEFAULT_TARGET) < 0)
                goto finish;

        /* Mount /proc, /sys and friends, so that /proc/cmdline and
         * /proc/$PID/fd is available. */
        if (mount_setup() < 0)
                goto finish;

        /* Reset all signal handlers. */
        assert_se(reset_all_signal_handlers() == 0);

        /* If we are init, we can block sigkill. Yay. */
        signal(SIGKILL, SIG_IGN);
        signal(SIGPIPE, SIG_IGN);

        /* Close all open files */
        assert_se(close_all_fds(NULL, 0) == 0);

        if (running_as != MANAGER_SESSION)
                if (parse_proc_cmdline() < 0)
                        goto finish;

        log_parse_environment();

        if (parse_argv(argc, argv) < 0)
                goto finish;

        if (action == ACTION_HELP) {
                retval = help();
                goto finish;
        } else if (action == ACTION_DUMP_CONFIGURATION_ITEMS) {
                unit_dump_config_items(stdout);
                retval = 0;
                goto finish;
        }

        assert_se(action == ACTION_RUN || action == ACTION_TEST);

        /* Set up PATH unless it is already set */
        setenv("PATH",
               "/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin",
               running_as == MANAGER_INIT);

        /* Move out of the way, so that we won't block unmounts */
        assert_se(chdir("/")  == 0);

        /* Become a session leader if we aren't one yet. */
        setsid();

        /* Disable the umask logic */
        umask(0);

        /* Make sure D-Bus doesn't fiddle with the SIGPIPE handlers */
        dbus_connection_set_change_sigpipe(FALSE);

        /* Open the logging devices, if possible and necessary */
        log_open_syslog();
        log_open_kmsg();

        /* Make sure we leave a core dump without panicing the
         * kernel. */
        if (getpid() == 1)
                install_crash_handler();

        log_debug("systemd running in %s mode.", manager_running_as_to_string(running_as));

        if (running_as == MANAGER_INIT)
                hostname_setup();

        if ((r = manager_new(running_as, &m)) < 0) {
                log_error("Failed to allocate manager object: %s", strerror(-r));
                goto finish;
        }

        if ((r = manager_coldplug(m)) < 0) {
                log_error("Failed to retrieve coldplug information: %s", strerror(-r));
                goto finish;
        }

        log_debug("Activating default unit: %s", default_unit);

        if ((r = manager_load_unit(m, default_unit, &target)) < 0) {
                log_error("Failed to load default target: %s", strerror(-r));

                log_info("Trying to load rescue target...");
                if ((r = manager_load_unit(m, SPECIAL_RESCUE_TARGET, &target)) < 0) {
                        log_error("Failed to load rescue target: %s", strerror(-r));
                        goto finish;
                }
        }

        if (action == ACTION_TEST) {
                printf("→ By units:\n");
                manager_dump_units(m, stdout, "\t");
        }

        if ((r = manager_add_job(m, JOB_START, target, JOB_REPLACE, false, &job)) < 0) {
                log_error("Failed to start default target: %s", strerror(-r));
                goto finish;
        }

        if (action == ACTION_TEST) {
                printf("→ By jobs:\n");
                manager_dump_jobs(m, stdout, "\t");

                if (getpid() == 1)
                        pause();

                retval = 0;
                goto finish;
        }

        if ((r = manager_loop(m)) < 0) {
                log_error("Failed to run mainloop: %s", strerror(-r));
                goto finish;
        }

        retval = 0;

        log_debug("Exit.");

finish:
        if (m)
                manager_free(m);

        free(default_unit);

        dbus_shutdown();

        return retval;
}
Commit	Line	Data
60918275 LP	1	/-- Mode: C; c-basic-offset: 8 --/
60918275 LP	2
a7334b09 LP	3	/***
	4	This file is part of systemd.
	5
	6	Copyright 2010 Lennart Poettering
	7
	8	systemd is free software; you can redistribute it and/or modify it
	9	under the terms of the GNU General Public License as published by
	10	the Free Software Foundation; either version 2 of the License, or
	11	(at your option) any later version.
	12
	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	General Public License for more details.
	17
	18	You should have received a copy of the GNU General Public License
	19	along with systemd; If not, see <http://www.gnu.org/licenses/>.
	20	***/
	21
ea430986 LP	22	#include <dbus/dbus.h>
ea430986 LP	23
60918275 LP	24	#include <stdio.h>
	25	#include <errno.h>
	26	#include <string.h>
16354eff	27	#include <unistd.h>
4ade7963 LP	28	#include <sys/types.h>
4ade7963 LP	29	#include <sys/stat.h>
f170852a	30	#include <getopt.h>
97c4f35c	31	#include <signal.h>
4fc935ca	32	#include <sys/wait.h>
60918275 LP	33
60918275 LP	34	#include "manager.h"
16354eff	35	#include "log.h"
4ade7963	36	#include "mount-setup.h"
302e8c4c LP	37	#include "hostname-setup.h"
302e8c4c LP	38	#include "load-fragment.h"
60918275	39
f170852a LP	40	static enum {
f170852a LP	41	ACTION_RUN,
e965d56d	42	ACTION_HELP,
e537352b LP	43	ACTION_TEST,
e537352b LP	44	ACTION_DUMP_CONFIGURATION_ITEMS
f170852a LP	45	} action = ACTION_RUN;
	46
	47	static char *default_unit = NULL;
a5dab5ce	48	static ManagerRunningAs running_as = _MANAGER_RUNNING_AS_INVALID;
4fc935ca	49
97c4f35c	50	static bool dump_core = true;
601f6a1e LP	51	static bool crash_shell = false;
601f6a1e LP	52	static int crash_chvt = -1;
97c4f35c LP	53
	54	_noreturn static void freeze(void) {
	55	for (;;)
	56	pause();
	57	}
	58
	59	_noreturn static void crash(int sig) {
	60
	61	if (!dump_core)
	62	log_error("Caught <%s>, not dumping core.", strsignal(sig));
	63	else {
	64	pid_t pid;
	65
97c4f35c	66	if ((pid = fork()) < 0)
4fc935ca	67	log_error("Caught <%s>, cannot fork for core dump: %s", strsignal(sig), strerror(errno));
97c4f35c LP	68
	69	else if (pid == 0) {
	70	struct sigaction sa;
	71	struct rlimit rl;
	72
	73	/* Enable default signal handler for core dump */
	74	zero(sa);
	75	sa.sa_handler = SIG_DFL;
	76	assert_se(sigaction(sig, &sa, NULL) == 0);
	77
	78	/* Don't limit the core dump size */
	79	zero(rl);
	80	rl.rlim_cur = RLIM_INFINITY;
	81	rl.rlim_max = RLIM_INFINITY;
	82	setrlimit(RLIMIT_CORE, &rl);
	83
	84	/* Just to be sure... */
	85	assert_se(chdir("/") == 0);
	86
	87	/* Raise the signal again */
	88	raise(sig);
	89
	90	assert_not_reached("We shouldn't be here...");
	91	_exit(1);
4fc935ca LP	92
	93	} else {
	94	int status, r;
	95
	96	/* Order things nicely. */
	97	if ((r = waitpid(pid, &status, 0)) < 0)
	98	log_error("Caught <%s>, waitpid() failed: %s", strsignal(sig), strerror(errno));
	99	else if (!WCOREDUMP(status))
	100	log_error("Caught <%s>, core dump failed.", strsignal(sig));
	101	else
	102	log_error("Caught <%s>, dumped core as pid %llu.", strsignal(sig), (unsigned long long) pid);
97c4f35c LP	103	}
	104	}
	105
601f6a1e LP	106	if (crash_chvt)
	107	chvt(crash_chvt);
	108
4fc935ca LP	109	if (crash_shell) {
	110	log_info("Executing crash shell in 10s...");
	111	sleep(10);
	112
	113	execl("/bin/sh", "/bin/sh", NULL);
	114	log_error("execl() failed: %s", strerror(errno));
	115	}
	116
	117	log_info("Freezing execution.");
97c4f35c LP	118	freeze();
	119	}
	120
	121	static void install_crash_handler(void) {
	122	struct sigaction sa;
	123
	124	zero(sa);
	125
	126	sa.sa_handler = crash;
	127	sa.sa_flags = SA_NODEFER;
	128
	129	assert_se(sigaction(SIGSEGV, &sa, NULL) == 0);
5373d602 LP	130	assert_se(sigaction(SIGILL, &sa, NULL) == 0);
	131	assert_se(sigaction(SIGFPE, &sa, NULL) == 0);
	132	assert_se(sigaction(SIGBUS, &sa, NULL) == 0);
	133	assert_se(sigaction(SIGQUIT, &sa, NULL) == 0);
97c4f35c LP	134	assert_se(sigaction(SIGABRT, &sa, NULL) == 0);
97c4f35c LP	135	}
f170852a LP	136
	137	static int set_default_unit(const char *u) {
	138	char *c;
	139
	140	assert(u);
	141
	142	if (!(c = strdup(u)))
	143	return -ENOMEM;
	144
	145	free(default_unit);
	146	default_unit = c;
	147	return 0;
	148	}
	149
	150	static int parse_proc_cmdline_word(const char *word) {
	151
	152	static const char * const rlmap[] = {
	153	"single", SPECIAL_RUNLEVEL1_TARGET,
	154	"-s", SPECIAL_RUNLEVEL1_TARGET,
	155	"s", SPECIAL_RUNLEVEL1_TARGET,
	156	"S", SPECIAL_RUNLEVEL1_TARGET,
	157	"1", SPECIAL_RUNLEVEL1_TARGET,
	158	"2", SPECIAL_RUNLEVEL2_TARGET,
	159	"3", SPECIAL_RUNLEVEL3_TARGET,
	160	"4", SPECIAL_RUNLEVEL4_TARGET,
	161	"5", SPECIAL_RUNLEVEL5_TARGET
	162	};
	163
	164	if (startswith(word, "systemd.default="))
82771ba1	165	return set_default_unit(word + 16);
f170852a LP	166
	167	else if (startswith(word, "systemd.log_target=")) {
	168
	169	if (log_set_target_from_string(word + 19) < 0)
	170	log_warning("Failed to parse log target %s. Ignoring.", word + 19);
	171
	172	} else if (startswith(word, "systemd.log_level=")) {
	173
	174	if (log_set_max_level_from_string(word + 18) < 0)
	175	log_warning("Failed to parse log level %s. Ignoring.", word + 18);
	176
4fc935ca LP	177	} else if (startswith(word, "systemd.dump_core=")) {
	178	int r;
	179
	180	if ((r = parse_boolean(word + 18)) < 0)
601f6a1e	181	log_warning("Failed to parse dump core switch %s, Ignoring.", word + 18);
4fc935ca LP	182	else
	183	dump_core = r;
	184
	185	} else if (startswith(word, "systemd.crash_shell=")) {
	186	int r;
	187
	188	if ((r = parse_boolean(word + 20)) < 0)
601f6a1e	189	log_warning("Failed to parse crash shell switch %s, Ignoring.", word + 20);
4fc935ca LP	190	else
	191	crash_shell = r;
	192
601f6a1e LP	193	} else if (startswith(word, "systemd.crash_chvt=")) {
	194	int k;
	195
	196	if (safe_atoi(word + 19, &k) < 0)
	197	log_warning("Failed to parse crash chvt switch %s, Ignoring.", word + 19);
	198	else
	199	crash_chvt = k;
	200
4fc935ca LP	201	} else if (startswith(word, "systemd.")) {
	202
	203	log_warning("Unknown kernel switch %s. Ignoring.", word);
	204
	205	log_info("Supported kernel switches:");
	206	log_info("systemd.default=UNIT Default unit to start");
	207	log_info("systemd.log_target=console\|kmsg\|syslog Log target");
	208	log_info("systemd.log_level=LEVEL Log level");
	209	log_info("systemd.dump_core=0\|1 Dump core on crash");
	210	log_info("systemd.crash_shell=0\|1 On crash run shell");
601f6a1e	211	log_info("systemd.crash_chvt=N Change to VT #N on crash");
4fc935ca	212
f170852a LP	213	} else {
	214	unsigned i;
	215
	216	/* SysV compatibility */
f170852a LP	217	for (i = 0; i < ELEMENTSOF(rlmap); i += 2)
	218	if (streq(word, rlmap[i]))
	219	return set_default_unit(rlmap[i+1]);
	220	}
	221
	222	return 0;
	223	}
	224
	225	static int parse_proc_cmdline(void) {
	226	char *line;
	227	int r;
	228	char *w;
	229	size_t l;
	230	char *state;
	231
	232	if ((r = read_one_line_file("/proc/cmdline", &line)) < 0) {
	233	log_warning("Failed to read /proc/cmdline, ignoring: %s", strerror(errno));
	234	return 0;
	235	}
	236
	237	FOREACH_WORD_QUOTED(w, l, line, state) {
	238	char *word;
	239
	240	if (!(word = strndup(w, l))) {
	241	r = -ENOMEM;
	242	goto finish;
	243	}
	244
	245	r = parse_proc_cmdline_word(word);
	246	free(word);
	247
	248	if (r < 0)
	249	goto finish;
	250	}
	251
	252	r = 0;
	253
	254	finish:
	255	free(line);
	256	return r;
	257	}
	258
	259	static int parse_argv(int argc, char *argv[]) {
	260
	261	enum {
	262	ARG_LOG_LEVEL = 0x100,
	263	ARG_LOG_TARGET,
a5dab5ce	264	ARG_DEFAULT,
e965d56d	265	ARG_RUNNING_AS,
e537352b LP	266	ARG_TEST,
e537352b LP	267	ARG_DUMP_CONFIGURATION_ITEMS
f170852a LP	268	};
	269
	270	static const struct option options[] = {
	271	{ "log-level", required_argument, NULL, ARG_LOG_LEVEL },
	272	{ "log-target", required_argument, NULL, ARG_LOG_TARGET },
	273	{ "default", required_argument, NULL, ARG_DEFAULT },
a5dab5ce	274	{ "running-as", required_argument, NULL, ARG_RUNNING_AS },
e965d56d	275	{ "test", no_argument, NULL, ARG_TEST },
f170852a	276	{ "help", no_argument, NULL, 'h' },
e537352b	277	{ "dump-configuration-items", no_argument, NULL, ARG_DUMP_CONFIGURATION_ITEMS },
f170852a LP	278	{ NULL, 0, NULL, 0 }
	279	};
	280
	281	int c, r;
	282
	283	assert(argc >= 1);
	284	assert(argv);
	285
	286	while ((c = getopt_long(argc, argv, "h", options, NULL)) >= 0)
	287
	288	switch (c) {
	289
	290	case ARG_LOG_LEVEL:
	291	if ((r = log_set_max_level_from_string(optarg)) < 0) {
	292	log_error("Failed to parse log level %s.", optarg);
	293	return r;
	294	}
	295
	296	break;
	297
	298	case ARG_LOG_TARGET:
	299
	300	if ((r = log_set_target_from_string(optarg)) < 0) {
	301	log_error("Failed to parse log target %s.", optarg);
	302	return r;
	303	}
	304
	305	break;
	306
	307	case ARG_DEFAULT:
	308
	309	if ((r = set_default_unit(optarg)) < 0) {
	310	log_error("Failed to set default unit %s: %s", optarg, strerror(-r));
	311	return r;
	312	}
	313
	314	break;
	315
a5dab5ce LP	316	case ARG_RUNNING_AS: {
	317	ManagerRunningAs as;
	318
	319	if ((as = manager_running_as_from_string(optarg)) < 0) {
	320	log_error("Failed to parse running as value %s", optarg);
	321	return -EINVAL;
	322	}
	323
	324	running_as = as;
	325	break;
	326	}
	327
e965d56d LP	328	case ARG_TEST:
	329	action = ACTION_TEST;
	330	break;
	331
e537352b LP	332	case ARG_DUMP_CONFIGURATION_ITEMS:
	333	action = ACTION_DUMP_CONFIGURATION_ITEMS;
	334	break;
	335
f170852a LP	336	case 'h':
	337	action = ACTION_HELP;
	338	break;
	339
	340	case '?':
	341	return -EINVAL;
	342
	343	default:
	344	log_error("Unknown option code %c", c);
	345	return -EINVAL;
	346	}
	347
f170852a LP	348	return 0;
	349	}
	350
	351	static int help(void) {
	352
	353	printf("%s [options]\n\n"
e537352b LP	354	" -h --help Show this help\n"
	355	" --default=UNIT Set default unit\n"
	356	" --log-level=LEVEL Set log level\n"
	357	" --log-target=TARGET Set log target (console, syslog, kmsg)\n"
	358	" --running-as=AS Set running as (init, system, session)\n"
	359	" --test Determine startup sequence, dump it and exit\n"
	360	" --dump-configuration-items Dump understood unit configuration items\n",
f170852a LP	361	__progname);
	362
	363	return 0;
	364	}
	365
60918275 LP	366	int main(int argc, char *argv[]) {
60918275 LP	367	Manager *m = NULL;
87f0e418	368	Unit *target = NULL;
60918275 LP	369	Job *job = NULL;
60918275 LP	370	int r, retval = 1;
27b14a22	371
a5dab5ce LP	372	if (getpid() == 1)
	373	running_as = MANAGER_INIT;
	374	else if (getuid() == 0)
	375	running_as = MANAGER_SYSTEM;
	376	else
	377	running_as = MANAGER_SESSION;
	378
f170852a LP	379	if (set_default_unit(SPECIAL_DEFAULT_TARGET) < 0)
f170852a LP	380	goto finish;
60918275	381
f170852a LP	382	/* Mount /proc, /sys and friends, so that /proc/cmdline and
f170852a LP	383	* /proc/$PID/fd is available. */
d89e521e LP	384	if (mount_setup() < 0)
d89e521e LP	385	goto finish;
4ade7963 LP	386
	387	/* Reset all signal handlers. */
	388	assert_se(reset_all_signal_handlers() == 0);
	389
078e4539 LP	390	/* If we are init, we can block sigkill. Yay. */
	391	signal(SIGKILL, SIG_IGN);
	392	signal(SIGPIPE, SIG_IGN);
	393
f170852a LP	394	/* Close all open files */
	395	assert_se(close_all_fds(NULL, 0) == 0);
	396
a5dab5ce LP	397	if (running_as != MANAGER_SESSION)
	398	if (parse_proc_cmdline() < 0)
	399	goto finish;
f170852a LP	400
	401	log_parse_environment();
	402
	403	if (parse_argv(argc, argv) < 0)
	404	goto finish;
	405
	406	if (action == ACTION_HELP) {
	407	retval = help();
	408	goto finish;
e537352b LP	409	} else if (action == ACTION_DUMP_CONFIGURATION_ITEMS) {
	410	unit_dump_config_items(stdout);
	411	retval = 0;
	412	goto finish;
f170852a LP	413	}
f170852a LP	414
e965d56d	415	assert_se(action == ACTION_RUN \|\| action == ACTION_TEST);
f170852a	416
09082a94	417	/* Set up PATH unless it is already set */
e537352b LP	418	setenv("PATH",
	419	"/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin",
	420	running_as == MANAGER_INIT);
09082a94	421
f170852a LP	422	/* Move out of the way, so that we won't block unmounts */
	423	assert_se(chdir("/") == 0);
	424
4ade7963 LP	425	/* Become a session leader if we aren't one yet. */
	426	setsid();
	427
	428	/* Disable the umask logic */
	429	umask(0);
	430
	431	/* Make sure D-Bus doesn't fiddle with the SIGPIPE handlers */
	432	dbus_connection_set_change_sigpipe(FALSE);
	433
18149b9f	434	/* Open the logging devices, if possible and necessary */
4ade7963 LP	435	log_open_syslog();
	436	log_open_kmsg();
	437
5373d602 LP	438	/* Make sure we leave a core dump without panicing the
5373d602 LP	439	* kernel. */
4fc935ca LP	440	if (getpid() == 1)
4fc935ca LP	441	install_crash_handler();
97c4f35c	442
a5dab5ce LP	443	log_debug("systemd running in %s mode.", manager_running_as_to_string(running_as));
a5dab5ce LP	444
302e8c4c	445	if (running_as == MANAGER_INIT)
e537352b	446	hostname_setup();
302e8c4c	447
a5dab5ce	448	if ((r = manager_new(running_as, &m)) < 0) {
8e274523	449	log_error("Failed to allocate manager object: %s", strerror(-r));
60918275 LP	450	goto finish;
	451	}
	452
f50e0a01 LP	453	if ((r = manager_coldplug(m)) < 0) {
	454	log_error("Failed to retrieve coldplug information: %s", strerror(-r));
	455	goto finish;
	456	}
	457
27b14a22 LP	458	log_debug("Activating default unit: %s", default_unit);
	459
	460	if ((r = manager_load_unit(m, default_unit, &target)) < 0) {
c22cbe26	461	log_error("Failed to load default target: %s", strerror(-r));
37d88da7 LP	462
	463	log_info("Trying to load rescue target...");
	464	if ((r = manager_load_unit(m, SPECIAL_RESCUE_TARGET, &target)) < 0) {
	465	log_error("Failed to load rescue target: %s", strerror(-r));
	466	goto finish;
	467	}
60918275 LP	468	}
60918275 LP	469
e965d56d LP	470	if (action == ACTION_TEST) {
	471	printf("→ By units:\n");
	472	manager_dump_units(m, stdout, "\t");
	473	}
d46de8a1	474
8f5847c4 LP	475	if ((r = manager_add_job(m, JOB_START, target, JOB_REPLACE, false, &job)) < 0) {
	476	log_error("Failed to start default target: %s", strerror(-r));
	477	goto finish;
	478	}
11dd41ce	479
e965d56d LP	480	if (action == ACTION_TEST) {
	481	printf("→ By jobs:\n");
	482	manager_dump_jobs(m, stdout, "\t");
	483
	484	if (getpid() == 1)
	485	pause();
	486
	487	retval = 0;
	488	goto finish;
	489	}
cea8e32e	490
c20cae32 LP	491	if ((r = manager_loop(m)) < 0) {
	492	log_error("Failed to run mainloop: %s", strerror(-r));
	493	goto finish;
	494	}
9152c765	495
60918275 LP	496	retval = 0;
60918275 LP	497
f170852a LP	498	log_debug("Exit.");
f170852a LP	499
60918275 LP	500	finish:
	501	if (m)
	502	manager_free(m);
	503
f170852a	504	free(default_unit);
b9cd2ec1	505
ea430986 LP	506	dbus_shutdown();
ea430986 LP	507
60918275 LP	508	return retval;
60918275 LP	509	}