[people/ms/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(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);

        /* 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 */
        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);
	130	assert_se(sigaction(SIGABRT, &sa, NULL) == 0);
	131	}
f170852a LP	132
	133	static int set_default_unit(const char *u) {
	134	char *c;
	135
	136	assert(u);
	137
	138	if (!(c = strdup(u)))
	139	return -ENOMEM;
	140
	141	free(default_unit);
	142	default_unit = c;
	143	return 0;
	144	}
	145
	146	static int parse_proc_cmdline_word(const char *word) {
	147
	148	static const char * const rlmap[] = {
	149	"single", SPECIAL_RUNLEVEL1_TARGET,
	150	"-s", SPECIAL_RUNLEVEL1_TARGET,
	151	"s", SPECIAL_RUNLEVEL1_TARGET,
	152	"S", SPECIAL_RUNLEVEL1_TARGET,
	153	"1", SPECIAL_RUNLEVEL1_TARGET,
	154	"2", SPECIAL_RUNLEVEL2_TARGET,
	155	"3", SPECIAL_RUNLEVEL3_TARGET,
	156	"4", SPECIAL_RUNLEVEL4_TARGET,
	157	"5", SPECIAL_RUNLEVEL5_TARGET
	158	};
	159
	160	if (startswith(word, "systemd.default="))
82771ba1	161	return set_default_unit(word + 16);
f170852a LP	162
	163	else if (startswith(word, "systemd.log_target=")) {
	164
	165	if (log_set_target_from_string(word + 19) < 0)
	166	log_warning("Failed to parse log target %s. Ignoring.", word + 19);
	167
	168	} else if (startswith(word, "systemd.log_level=")) {
	169
	170	if (log_set_max_level_from_string(word + 18) < 0)
	171	log_warning("Failed to parse log level %s. Ignoring.", word + 18);
	172
4fc935ca LP	173	} else if (startswith(word, "systemd.dump_core=")) {
	174	int r;
	175
	176	if ((r = parse_boolean(word + 18)) < 0)
601f6a1e	177	log_warning("Failed to parse dump core switch %s, Ignoring.", word + 18);
4fc935ca LP	178	else
	179	dump_core = r;
	180
	181	} else if (startswith(word, "systemd.crash_shell=")) {
	182	int r;
	183
	184	if ((r = parse_boolean(word + 20)) < 0)
601f6a1e	185	log_warning("Failed to parse crash shell switch %s, Ignoring.", word + 20);
4fc935ca LP	186	else
	187	crash_shell = r;
	188
601f6a1e LP	189	} else if (startswith(word, "systemd.crash_chvt=")) {
	190	int k;
	191
	192	if (safe_atoi(word + 19, &k) < 0)
	193	log_warning("Failed to parse crash chvt switch %s, Ignoring.", word + 19);
	194	else
	195	crash_chvt = k;
	196
4fc935ca LP	197	} else if (startswith(word, "systemd.")) {
	198
	199	log_warning("Unknown kernel switch %s. Ignoring.", word);
	200
	201	log_info("Supported kernel switches:");
	202	log_info("systemd.default=UNIT Default unit to start");
	203	log_info("systemd.log_target=console\|kmsg\|syslog Log target");
	204	log_info("systemd.log_level=LEVEL Log level");
	205	log_info("systemd.dump_core=0\|1 Dump core on crash");
	206	log_info("systemd.crash_shell=0\|1 On crash run shell");
601f6a1e	207	log_info("systemd.crash_chvt=N Change to VT #N on crash");
4fc935ca	208
f170852a LP	209	} else {
	210	unsigned i;
	211
	212	/* SysV compatibility */
f170852a LP	213	for (i = 0; i < ELEMENTSOF(rlmap); i += 2)
	214	if (streq(word, rlmap[i]))
	215	return set_default_unit(rlmap[i+1]);
	216	}
	217
	218	return 0;
	219	}
	220
	221	static int parse_proc_cmdline(void) {
	222	char *line;
	223	int r;
	224	char *w;
	225	size_t l;
	226	char *state;
	227
	228	if ((r = read_one_line_file("/proc/cmdline", &line)) < 0) {
	229	log_warning("Failed to read /proc/cmdline, ignoring: %s", strerror(errno));
	230	return 0;
	231	}
	232
	233	FOREACH_WORD_QUOTED(w, l, line, state) {
	234	char *word;
	235
	236	if (!(word = strndup(w, l))) {
	237	r = -ENOMEM;
	238	goto finish;
	239	}
	240
	241	r = parse_proc_cmdline_word(word);
	242	free(word);
	243
	244	if (r < 0)
	245	goto finish;
	246	}
	247
	248	r = 0;
	249
	250	finish:
	251	free(line);
	252	return r;
	253	}
	254
	255	static int parse_argv(int argc, char *argv[]) {
	256
	257	enum {
	258	ARG_LOG_LEVEL = 0x100,
	259	ARG_LOG_TARGET,
a5dab5ce	260	ARG_DEFAULT,
e965d56d	261	ARG_RUNNING_AS,
e537352b LP	262	ARG_TEST,
e537352b LP	263	ARG_DUMP_CONFIGURATION_ITEMS
f170852a LP	264	};
	265
	266	static const struct option options[] = {
	267	{ "log-level", required_argument, NULL, ARG_LOG_LEVEL },
	268	{ "log-target", required_argument, NULL, ARG_LOG_TARGET },
	269	{ "default", required_argument, NULL, ARG_DEFAULT },
a5dab5ce	270	{ "running-as", required_argument, NULL, ARG_RUNNING_AS },
e965d56d	271	{ "test", no_argument, NULL, ARG_TEST },
f170852a	272	{ "help", no_argument, NULL, 'h' },
e537352b	273	{ "dump-configuration-items", no_argument, NULL, ARG_DUMP_CONFIGURATION_ITEMS },
f170852a LP	274	{ NULL, 0, NULL, 0 }
	275	};
	276
	277	int c, r;
	278
	279	assert(argc >= 1);
	280	assert(argv);
	281
	282	while ((c = getopt_long(argc, argv, "h", options, NULL)) >= 0)
	283
	284	switch (c) {
	285
	286	case ARG_LOG_LEVEL:
	287	if ((r = log_set_max_level_from_string(optarg)) < 0) {
	288	log_error("Failed to parse log level %s.", optarg);
	289	return r;
	290	}
	291
	292	break;
	293
	294	case ARG_LOG_TARGET:
	295
	296	if ((r = log_set_target_from_string(optarg)) < 0) {
	297	log_error("Failed to parse log target %s.", optarg);
	298	return r;
	299	}
	300
	301	break;
	302
	303	case ARG_DEFAULT:
	304
	305	if ((r = set_default_unit(optarg)) < 0) {
	306	log_error("Failed to set default unit %s: %s", optarg, strerror(-r));
	307	return r;
	308	}
	309
	310	break;
	311
a5dab5ce LP	312	case ARG_RUNNING_AS: {
	313	ManagerRunningAs as;
	314
	315	if ((as = manager_running_as_from_string(optarg)) < 0) {
	316	log_error("Failed to parse running as value %s", optarg);
	317	return -EINVAL;
	318	}
	319
	320	running_as = as;
	321	break;
	322	}
	323
e965d56d LP	324	case ARG_TEST:
	325	action = ACTION_TEST;
	326	break;
	327
e537352b LP	328	case ARG_DUMP_CONFIGURATION_ITEMS:
	329	action = ACTION_DUMP_CONFIGURATION_ITEMS;
	330	break;
	331
f170852a LP	332	case 'h':
	333	action = ACTION_HELP;
	334	break;
	335
	336	case '?':
	337	return -EINVAL;
	338
	339	default:
	340	log_error("Unknown option code %c", c);
	341	return -EINVAL;
	342	}
	343
f170852a LP	344	return 0;
	345	}
	346
	347	static int help(void) {
	348
	349	printf("%s [options]\n\n"
e537352b LP	350	" -h --help Show this help\n"
	351	" --default=UNIT Set default unit\n"
	352	" --log-level=LEVEL Set log level\n"
	353	" --log-target=TARGET Set log target (console, syslog, kmsg)\n"
	354	" --running-as=AS Set running as (init, system, session)\n"
	355	" --test Determine startup sequence, dump it and exit\n"
	356	" --dump-configuration-items Dump understood unit configuration items\n",
f170852a LP	357	__progname);
	358
	359	return 0;
	360	}
	361
60918275 LP	362	int main(int argc, char *argv[]) {
60918275 LP	363	Manager *m = NULL;
87f0e418	364	Unit *target = NULL;
60918275 LP	365	Job *job = NULL;
60918275 LP	366	int r, retval = 1;
27b14a22	367
a5dab5ce LP	368	if (getpid() == 1)
	369	running_as = MANAGER_INIT;
	370	else if (getuid() == 0)
	371	running_as = MANAGER_SYSTEM;
	372	else
	373	running_as = MANAGER_SESSION;
	374
f170852a LP	375	if (set_default_unit(SPECIAL_DEFAULT_TARGET) < 0)
f170852a LP	376	goto finish;
60918275	377
f170852a LP	378	/* Mount /proc, /sys and friends, so that /proc/cmdline and
f170852a LP	379	* /proc/$PID/fd is available. */
d89e521e LP	380	if (mount_setup() < 0)
d89e521e LP	381	goto finish;
4ade7963 LP	382
	383	/* Reset all signal handlers. */
	384	assert_se(reset_all_signal_handlers() == 0);
	385
f170852a LP	386	/* Close all open files */
	387	assert_se(close_all_fds(NULL, 0) == 0);
	388
a5dab5ce LP	389	if (running_as != MANAGER_SESSION)
	390	if (parse_proc_cmdline() < 0)
	391	goto finish;
f170852a LP	392
	393	log_parse_environment();
	394
	395	if (parse_argv(argc, argv) < 0)
	396	goto finish;
	397
	398	if (action == ACTION_HELP) {
	399	retval = help();
	400	goto finish;
e537352b LP	401	} else if (action == ACTION_DUMP_CONFIGURATION_ITEMS) {
	402	unit_dump_config_items(stdout);
	403	retval = 0;
	404	goto finish;
f170852a LP	405	}
f170852a LP	406
e965d56d	407	assert_se(action == ACTION_RUN \|\| action == ACTION_TEST);
f170852a	408
09082a94	409	/* Set up PATH unless it is already set */
e537352b LP	410	setenv("PATH",
	411	"/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin",
	412	running_as == MANAGER_INIT);
09082a94	413
f170852a LP	414	/* Move out of the way, so that we won't block unmounts */
	415	assert_se(chdir("/") == 0);
	416
4ade7963 LP	417	/* Become a session leader if we aren't one yet. */
	418	setsid();
	419
	420	/* Disable the umask logic */
	421	umask(0);
	422
	423	/* Make sure D-Bus doesn't fiddle with the SIGPIPE handlers */
	424	dbus_connection_set_change_sigpipe(FALSE);
	425
18149b9f	426	/* Open the logging devices, if possible and necessary */
4ade7963 LP	427	log_open_syslog();
	428	log_open_kmsg();
	429
18149b9f	430	/* Make sure we leave a core dump */
4fc935ca LP	431	if (getpid() == 1)
4fc935ca LP	432	install_crash_handler();
97c4f35c	433
a5dab5ce LP	434	log_debug("systemd running in %s mode.", manager_running_as_to_string(running_as));
a5dab5ce LP	435
302e8c4c	436	if (running_as == MANAGER_INIT)
e537352b	437	hostname_setup();
302e8c4c	438
a5dab5ce	439	if ((r = manager_new(running_as, &m)) < 0) {
8e274523	440	log_error("Failed to allocate manager object: %s", strerror(-r));
60918275 LP	441	goto finish;
	442	}
	443
f50e0a01 LP	444	if ((r = manager_coldplug(m)) < 0) {
	445	log_error("Failed to retrieve coldplug information: %s", strerror(-r));
	446	goto finish;
	447	}
	448
27b14a22 LP	449	log_debug("Activating default unit: %s", default_unit);
	450
	451	if ((r = manager_load_unit(m, default_unit, &target)) < 0) {
c22cbe26	452	log_error("Failed to load default target: %s", strerror(-r));
37d88da7 LP	453
	454	log_info("Trying to load rescue target...");
	455	if ((r = manager_load_unit(m, SPECIAL_RESCUE_TARGET, &target)) < 0) {
	456	log_error("Failed to load rescue target: %s", strerror(-r));
	457	goto finish;
	458	}
60918275 LP	459	}
60918275 LP	460
e965d56d LP	461	if (action == ACTION_TEST) {
	462	printf("→ By units:\n");
	463	manager_dump_units(m, stdout, "\t");
	464	}
d46de8a1	465
8f5847c4 LP	466	if ((r = manager_add_job(m, JOB_START, target, JOB_REPLACE, false, &job)) < 0) {
	467	log_error("Failed to start default target: %s", strerror(-r));
	468	goto finish;
	469	}
11dd41ce	470
e965d56d LP	471	if (action == ACTION_TEST) {
	472	printf("→ By jobs:\n");
	473	manager_dump_jobs(m, stdout, "\t");
	474
	475	if (getpid() == 1)
	476	pause();
	477
	478	retval = 0;
	479	goto finish;
	480	}
cea8e32e	481
c20cae32 LP	482	if ((r = manager_loop(m)) < 0) {
	483	log_error("Failed to run mainloop: %s", strerror(-r));
	484	goto finish;
	485	}
9152c765	486
60918275 LP	487	retval = 0;
60918275 LP	488
f170852a LP	489	log_debug("Exit.");
f170852a LP	490
60918275 LP	491	finish:
	492	if (m)
	493	manager_free(m);
	494
f170852a	495	free(default_unit);
b9cd2ec1	496
ea430986 LP	497	dbus_shutdown();
ea430986 LP	498
60918275 LP	499	return retval;
60918275 LP	500	}