[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 <fcntl.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;

static bool confirm_spawn = false;

_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) {
                sigset_t mask;

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

                /* Make sure the signal is not delivered inside the
                 * exec() */
                assert_se(sigemptyset(&mask) == 0);
                assert_se(sigaddset(&mask, sig) == 0);
                assert_se(sigprocmask(SIG_SETMASK, &mask, NULL) == 0);

                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 console_setup(void) {
        int tty_fd = -1, null_fd = -1, r = 0;

        /* If we are init, we connect stdout/stderr to /dev/console
         * and stdin to /dev/null and make sure we don't have a
         * controlling tty. */

        release_terminal();

        if ((tty_fd = open_terminal("/dev/console", O_WRONLY)) < 0) {
                log_error("Failed to open /dev/console: %s", strerror(-tty_fd));
                r = -tty_fd;
                goto finish;
        }

        if ((null_fd = open("/dev/null", O_RDONLY)) < 0) {
                log_error("Failed to open /dev/null: %m");
                r = -errno;
                goto finish;
        }

        assert(tty_fd >= 3);
        assert(null_fd >= 3);

        if (reset_terminal(tty_fd) < 0)
                log_error("Failed to reset /dev/console: %m");

        if (dup2(tty_fd, STDOUT_FILENO) < 0 ||
            dup2(tty_fd, STDERR_FILENO) < 0 ||
            dup2(null_fd, STDIN_FILENO) < 0) {
                log_error("Failed to dup2() device: %m");
                r = -errno;
                goto finish;
        }

        r = 0;

finish:
        if (tty_fd >= 0)
                close_nointr(tty_fd);

        if (null_fd >= 0)
                close_nointr(null_fd);

        return r;
}

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,
                ARG_CONFIRM_SPAWN
        };

        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 },
                { "confirm-spawn", no_argument,    NULL, ARG_CONFIRM_SPAWN },
                { 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 ARG_CONFIRM_SPAWN:
                        confirm_spawn = true;
                        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"
               "     --confirm-spawn             Ask for confirmation when spawning processes\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. */
        ignore_signal(SIGKILL);
        ignore_signal(SIGPIPE);

        /* 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);

        if (running_as != MANAGER_SESSION) {
                /* Become a session leader if we aren't one yet. */
                setsid();

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

        if (running_as == MANAGER_INIT)
                console_setup();

        /* 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, confirm_spawn, &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>
80876c20	33	#include <fcntl.h>
60918275 LP	34
60918275 LP	35	#include "manager.h"
16354eff	36	#include "log.h"
4ade7963	37	#include "mount-setup.h"
302e8c4c LP	38	#include "hostname-setup.h"
302e8c4c LP	39	#include "load-fragment.h"
60918275	40
f170852a LP	41	static enum {
f170852a LP	42	ACTION_RUN,
e965d56d	43	ACTION_HELP,
e537352b LP	44	ACTION_TEST,
e537352b LP	45	ACTION_DUMP_CONFIGURATION_ITEMS
f170852a LP	46	} action = ACTION_RUN;
	47
	48	static char *default_unit = NULL;
a5dab5ce	49	static ManagerRunningAs running_as = _MANAGER_RUNNING_AS_INVALID;
4fc935ca	50
97c4f35c	51	static bool dump_core = true;
601f6a1e LP	52	static bool crash_shell = false;
601f6a1e LP	53	static int crash_chvt = -1;
97c4f35c	54
80876c20 LP	55	static bool confirm_spawn = false;
80876c20 LP	56
97c4f35c LP	57	_noreturn static void freeze(void) {
	58	for (;;)
	59	pause();
	60	}
	61
	62	_noreturn static void crash(int sig) {
	63
	64	if (!dump_core)
	65	log_error("Caught <%s>, not dumping core.", strsignal(sig));
	66	else {
	67	pid_t pid;
	68
97c4f35c	69	if ((pid = fork()) < 0)
4fc935ca	70	log_error("Caught <%s>, cannot fork for core dump: %s", strsignal(sig), strerror(errno));
97c4f35c LP	71
	72	else if (pid == 0) {
	73	struct sigaction sa;
	74	struct rlimit rl;
	75
	76	/* Enable default signal handler for core dump */
	77	zero(sa);
	78	sa.sa_handler = SIG_DFL;
	79	assert_se(sigaction(sig, &sa, NULL) == 0);
	80
	81	/* Don't limit the core dump size */
	82	zero(rl);
	83	rl.rlim_cur = RLIM_INFINITY;
	84	rl.rlim_max = RLIM_INFINITY;
	85	setrlimit(RLIMIT_CORE, &rl);
	86
	87	/* Just to be sure... */
	88	assert_se(chdir("/") == 0);
	89
	90	/* Raise the signal again */
	91	raise(sig);
	92
	93	assert_not_reached("We shouldn't be here...");
	94	_exit(1);
4fc935ca LP	95
	96	} else {
	97	int status, r;
	98
	99	/* Order things nicely. */
	100	if ((r = waitpid(pid, &status, 0)) < 0)
	101	log_error("Caught <%s>, waitpid() failed: %s", strsignal(sig), strerror(errno));
	102	else if (!WCOREDUMP(status))
	103	log_error("Caught <%s>, core dump failed.", strsignal(sig));
	104	else
	105	log_error("Caught <%s>, dumped core as pid %llu.", strsignal(sig), (unsigned long long) pid);
97c4f35c LP	106	}
	107	}
	108
601f6a1e LP	109	if (crash_chvt)
	110	chvt(crash_chvt);
	111
4fc935ca	112	if (crash_shell) {
8c43883a LP	113	sigset_t mask;
8c43883a LP	114
4fc935ca LP	115	log_info("Executing crash shell in 10s...");
	116	sleep(10);
	117
8c43883a LP	118	/* Make sure the signal is not delivered inside the
	119	* exec() */
	120	assert_se(sigemptyset(&mask) == 0);
	121	assert_se(sigaddset(&mask, sig) == 0);
	122	assert_se(sigprocmask(SIG_SETMASK, &mask, NULL) == 0);
	123
4fc935ca LP	124	execl("/bin/sh", "/bin/sh", NULL);
	125	log_error("execl() failed: %s", strerror(errno));
	126	}
	127
	128	log_info("Freezing execution.");
97c4f35c LP	129	freeze();
	130	}
	131
	132	static void install_crash_handler(void) {
	133	struct sigaction sa;
	134
	135	zero(sa);
	136
	137	sa.sa_handler = crash;
	138	sa.sa_flags = SA_NODEFER;
	139
	140	assert_se(sigaction(SIGSEGV, &sa, NULL) == 0);
5373d602 LP	141	assert_se(sigaction(SIGILL, &sa, NULL) == 0);
	142	assert_se(sigaction(SIGFPE, &sa, NULL) == 0);
	143	assert_se(sigaction(SIGBUS, &sa, NULL) == 0);
	144	assert_se(sigaction(SIGQUIT, &sa, NULL) == 0);
97c4f35c LP	145	assert_se(sigaction(SIGABRT, &sa, NULL) == 0);
97c4f35c LP	146	}
f170852a	147
80876c20 LP	148	static int console_setup(void) {
	149	int tty_fd = -1, null_fd = -1, r = 0;
	150
	151	/* If we are init, we connect stdout/stderr to /dev/console
	152	* and stdin to /dev/null and make sure we don't have a
	153	* controlling tty. */
	154
	155	release_terminal();
	156
	157	if ((tty_fd = open_terminal("/dev/console", O_WRONLY)) < 0) {
	158	log_error("Failed to open /dev/console: %s", strerror(-tty_fd));
	159	r = -tty_fd;
	160	goto finish;
	161	}
	162
	163	if ((null_fd = open("/dev/null", O_RDONLY)) < 0) {
	164	log_error("Failed to open /dev/null: %m");
	165	r = -errno;
	166	goto finish;
	167	}
	168
	169	assert(tty_fd >= 3);
	170	assert(null_fd >= 3);
	171
	172	if (reset_terminal(tty_fd) < 0)
	173	log_error("Failed to reset /dev/console: %m");
	174
	175	if (dup2(tty_fd, STDOUT_FILENO) < 0 \|\|
	176	dup2(tty_fd, STDERR_FILENO) < 0 \|\|
	177	dup2(null_fd, STDIN_FILENO) < 0) {
	178	log_error("Failed to dup2() device: %m");
	179	r = -errno;
	180	goto finish;
	181	}
	182
	183	r = 0;
	184
	185	finish:
	186	if (tty_fd >= 0)
	187	close_nointr(tty_fd);
	188
	189	if (null_fd >= 0)
	190	close_nointr(null_fd);
	191
	192	return r;
	193	}
	194
f170852a LP	195	static int set_default_unit(const char *u) {
	196	char *c;
	197
	198	assert(u);
	199
	200	if (!(c = strdup(u)))
	201	return -ENOMEM;
	202
	203	free(default_unit);
	204	default_unit = c;
	205	return 0;
	206	}
	207
	208	static int parse_proc_cmdline_word(const char *word) {
	209
	210	static const char * const rlmap[] = {
	211	"single", SPECIAL_RUNLEVEL1_TARGET,
	212	"-s", SPECIAL_RUNLEVEL1_TARGET,
	213	"s", SPECIAL_RUNLEVEL1_TARGET,
	214	"S", SPECIAL_RUNLEVEL1_TARGET,
	215	"1", SPECIAL_RUNLEVEL1_TARGET,
	216	"2", SPECIAL_RUNLEVEL2_TARGET,
	217	"3", SPECIAL_RUNLEVEL3_TARGET,
	218	"4", SPECIAL_RUNLEVEL4_TARGET,
	219	"5", SPECIAL_RUNLEVEL5_TARGET
	220	};
	221
	222	if (startswith(word, "systemd.default="))
82771ba1	223	return set_default_unit(word + 16);
f170852a LP	224
	225	else if (startswith(word, "systemd.log_target=")) {
	226
	227	if (log_set_target_from_string(word + 19) < 0)
	228	log_warning("Failed to parse log target %s. Ignoring.", word + 19);
	229
	230	} else if (startswith(word, "systemd.log_level=")) {
	231
	232	if (log_set_max_level_from_string(word + 18) < 0)
	233	log_warning("Failed to parse log level %s. Ignoring.", word + 18);
	234
4fc935ca LP	235	} else if (startswith(word, "systemd.dump_core=")) {
	236	int r;
	237
	238	if ((r = parse_boolean(word + 18)) < 0)
601f6a1e	239	log_warning("Failed to parse dump core switch %s, Ignoring.", word + 18);
4fc935ca LP	240	else
	241	dump_core = r;
	242
	243	} else if (startswith(word, "systemd.crash_shell=")) {
	244	int r;
	245
	246	if ((r = parse_boolean(word + 20)) < 0)
601f6a1e	247	log_warning("Failed to parse crash shell switch %s, Ignoring.", word + 20);
4fc935ca LP	248	else
	249	crash_shell = r;
	250
601f6a1e LP	251	} else if (startswith(word, "systemd.crash_chvt=")) {
	252	int k;
	253
	254	if (safe_atoi(word + 19, &k) < 0)
	255	log_warning("Failed to parse crash chvt switch %s, Ignoring.", word + 19);
	256	else
	257	crash_chvt = k;
	258
4fc935ca LP	259	} else if (startswith(word, "systemd.")) {
	260
	261	log_warning("Unknown kernel switch %s. Ignoring.", word);
	262
	263	log_info("Supported kernel switches:");
	264	log_info("systemd.default=UNIT Default unit to start");
	265	log_info("systemd.log_target=console\|kmsg\|syslog Log target");
	266	log_info("systemd.log_level=LEVEL Log level");
	267	log_info("systemd.dump_core=0\|1 Dump core on crash");
	268	log_info("systemd.crash_shell=0\|1 On crash run shell");
601f6a1e	269	log_info("systemd.crash_chvt=N Change to VT #N on crash");
4fc935ca	270
f170852a LP	271	} else {
	272	unsigned i;
	273
	274	/* SysV compatibility */
f170852a LP	275	for (i = 0; i < ELEMENTSOF(rlmap); i += 2)
	276	if (streq(word, rlmap[i]))
	277	return set_default_unit(rlmap[i+1]);
	278	}
	279
	280	return 0;
	281	}
	282
	283	static int parse_proc_cmdline(void) {
	284	char *line;
	285	int r;
	286	char *w;
	287	size_t l;
	288	char *state;
	289
	290	if ((r = read_one_line_file("/proc/cmdline", &line)) < 0) {
	291	log_warning("Failed to read /proc/cmdline, ignoring: %s", strerror(errno));
	292	return 0;
	293	}
	294
	295	FOREACH_WORD_QUOTED(w, l, line, state) {
	296	char *word;
	297
	298	if (!(word = strndup(w, l))) {
	299	r = -ENOMEM;
	300	goto finish;
	301	}
	302
	303	r = parse_proc_cmdline_word(word);
	304	free(word);
	305
	306	if (r < 0)
	307	goto finish;
	308	}
	309
	310	r = 0;
	311
	312	finish:
	313	free(line);
	314	return r;
	315	}
	316
	317	static int parse_argv(int argc, char *argv[]) {
	318
	319	enum {
	320	ARG_LOG_LEVEL = 0x100,
	321	ARG_LOG_TARGET,
a5dab5ce	322	ARG_DEFAULT,
e965d56d	323	ARG_RUNNING_AS,
e537352b	324	ARG_TEST,
80876c20 LP	325	ARG_DUMP_CONFIGURATION_ITEMS,
80876c20 LP	326	ARG_CONFIRM_SPAWN
f170852a LP	327	};
	328
	329	static const struct option options[] = {
	330	{ "log-level", required_argument, NULL, ARG_LOG_LEVEL },
	331	{ "log-target", required_argument, NULL, ARG_LOG_TARGET },
	332	{ "default", required_argument, NULL, ARG_DEFAULT },
a5dab5ce	333	{ "running-as", required_argument, NULL, ARG_RUNNING_AS },
e965d56d	334	{ "test", no_argument, NULL, ARG_TEST },
f170852a	335	{ "help", no_argument, NULL, 'h' },
e537352b	336	{ "dump-configuration-items", no_argument, NULL, ARG_DUMP_CONFIGURATION_ITEMS },
80876c20	337	{ "confirm-spawn", no_argument, NULL, ARG_CONFIRM_SPAWN },
f170852a LP	338	{ NULL, 0, NULL, 0 }
	339	};
	340
	341	int c, r;
	342
	343	assert(argc >= 1);
	344	assert(argv);
	345
	346	while ((c = getopt_long(argc, argv, "h", options, NULL)) >= 0)
	347
	348	switch (c) {
	349
	350	case ARG_LOG_LEVEL:
	351	if ((r = log_set_max_level_from_string(optarg)) < 0) {
	352	log_error("Failed to parse log level %s.", optarg);
	353	return r;
	354	}
	355
	356	break;
	357
	358	case ARG_LOG_TARGET:
	359
	360	if ((r = log_set_target_from_string(optarg)) < 0) {
	361	log_error("Failed to parse log target %s.", optarg);
	362	return r;
	363	}
	364
	365	break;
	366
	367	case ARG_DEFAULT:
	368
	369	if ((r = set_default_unit(optarg)) < 0) {
	370	log_error("Failed to set default unit %s: %s", optarg, strerror(-r));
	371	return r;
	372	}
	373
	374	break;
	375
a5dab5ce LP	376	case ARG_RUNNING_AS: {
	377	ManagerRunningAs as;
	378
	379	if ((as = manager_running_as_from_string(optarg)) < 0) {
	380	log_error("Failed to parse running as value %s", optarg);
	381	return -EINVAL;
	382	}
	383
	384	running_as = as;
	385	break;
	386	}
	387
e965d56d LP	388	case ARG_TEST:
	389	action = ACTION_TEST;
	390	break;
	391
e537352b LP	392	case ARG_DUMP_CONFIGURATION_ITEMS:
	393	action = ACTION_DUMP_CONFIGURATION_ITEMS;
	394	break;
	395
80876c20 LP	396	case ARG_CONFIRM_SPAWN:
	397	confirm_spawn = true;
	398	break;
	399
f170852a LP	400	case 'h':
	401	action = ACTION_HELP;
	402	break;
	403
	404	case '?':
	405	return -EINVAL;
	406
	407	default:
	408	log_error("Unknown option code %c", c);
	409	return -EINVAL;
	410	}
	411
f170852a LP	412	return 0;
	413	}
	414
	415	static int help(void) {
	416
	417	printf("%s [options]\n\n"
e537352b LP	418	" -h --help Show this help\n"
	419	" --default=UNIT Set default unit\n"
	420	" --log-level=LEVEL Set log level\n"
	421	" --log-target=TARGET Set log target (console, syslog, kmsg)\n"
	422	" --running-as=AS Set running as (init, system, session)\n"
	423	" --test Determine startup sequence, dump it and exit\n"
80876c20 LP	424	" --dump-configuration-items Dump understood unit configuration items\n"
80876c20 LP	425	" --confirm-spawn Ask for confirmation when spawning processes\n",
f170852a LP	426	__progname);
	427
	428	return 0;
	429	}
	430
60918275 LP	431	int main(int argc, char *argv[]) {
60918275 LP	432	Manager *m = NULL;
87f0e418	433	Unit *target = NULL;
60918275 LP	434	Job *job = NULL;
60918275 LP	435	int r, retval = 1;
27b14a22	436
a5dab5ce LP	437	if (getpid() == 1)
	438	running_as = MANAGER_INIT;
	439	else if (getuid() == 0)
	440	running_as = MANAGER_SYSTEM;
	441	else
	442	running_as = MANAGER_SESSION;
	443
f170852a LP	444	if (set_default_unit(SPECIAL_DEFAULT_TARGET) < 0)
f170852a LP	445	goto finish;
60918275	446
f170852a LP	447	/* Mount /proc, /sys and friends, so that /proc/cmdline and
f170852a LP	448	* /proc/$PID/fd is available. */
d89e521e LP	449	if (mount_setup() < 0)
d89e521e LP	450	goto finish;
4ade7963 LP	451
	452	/* Reset all signal handlers. */
	453	assert_se(reset_all_signal_handlers() == 0);
	454
078e4539	455	/* If we are init, we can block sigkill. Yay. */
a337c6fc LP	456	ignore_signal(SIGKILL);
a337c6fc LP	457	ignore_signal(SIGPIPE);
078e4539	458
f170852a LP	459	/* Close all open files */
	460	assert_se(close_all_fds(NULL, 0) == 0);
	461
a5dab5ce LP	462	if (running_as != MANAGER_SESSION)
	463	if (parse_proc_cmdline() < 0)
	464	goto finish;
f170852a LP	465
	466	log_parse_environment();
	467
	468	if (parse_argv(argc, argv) < 0)
	469	goto finish;
	470
	471	if (action == ACTION_HELP) {
	472	retval = help();
	473	goto finish;
e537352b LP	474	} else if (action == ACTION_DUMP_CONFIGURATION_ITEMS) {
	475	unit_dump_config_items(stdout);
	476	retval = 0;
	477	goto finish;
f170852a LP	478	}
f170852a LP	479
e965d56d	480	assert_se(action == ACTION_RUN \|\| action == ACTION_TEST);
f170852a	481
09082a94	482	/* Set up PATH unless it is already set */
e537352b LP	483	setenv("PATH",
	484	"/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin",
	485	running_as == MANAGER_INIT);
09082a94	486
f170852a LP	487	/* Move out of the way, so that we won't block unmounts */
	488	assert_se(chdir("/") == 0);
	489
80876c20 LP	490	if (running_as != MANAGER_SESSION) {
	491	/* Become a session leader if we aren't one yet. */
	492	setsid();
4ade7963	493
80876c20 LP	494	/* Disable the umask logic */
	495	umask(0);
	496	}
	497
	498	if (running_as == MANAGER_INIT)
	499	console_setup();
4ade7963 LP	500
	501	/* Make sure D-Bus doesn't fiddle with the SIGPIPE handlers */
	502	dbus_connection_set_change_sigpipe(FALSE);
	503
18149b9f	504	/* Open the logging devices, if possible and necessary */
4ade7963 LP	505	log_open_syslog();
	506	log_open_kmsg();
	507
5373d602 LP	508	/* Make sure we leave a core dump without panicing the
5373d602 LP	509	* kernel. */
4fc935ca LP	510	if (getpid() == 1)
4fc935ca LP	511	install_crash_handler();
97c4f35c	512
a5dab5ce LP	513	log_debug("systemd running in %s mode.", manager_running_as_to_string(running_as));
a5dab5ce LP	514
302e8c4c	515	if (running_as == MANAGER_INIT)
e537352b	516	hostname_setup();
302e8c4c	517
80876c20	518	if ((r = manager_new(running_as, confirm_spawn, &m)) < 0) {
8e274523	519	log_error("Failed to allocate manager object: %s", strerror(-r));
60918275 LP	520	goto finish;
	521	}
	522
f50e0a01 LP	523	if ((r = manager_coldplug(m)) < 0) {
	524	log_error("Failed to retrieve coldplug information: %s", strerror(-r));
	525	goto finish;
	526	}
	527
27b14a22 LP	528	log_debug("Activating default unit: %s", default_unit);
	529
	530	if ((r = manager_load_unit(m, default_unit, &target)) < 0) {
c22cbe26	531	log_error("Failed to load default target: %s", strerror(-r));
37d88da7 LP	532
	533	log_info("Trying to load rescue target...");
	534	if ((r = manager_load_unit(m, SPECIAL_RESCUE_TARGET, &target)) < 0) {
	535	log_error("Failed to load rescue target: %s", strerror(-r));
	536	goto finish;
	537	}
60918275 LP	538	}
60918275 LP	539
e965d56d LP	540	if (action == ACTION_TEST) {
	541	printf("→ By units:\n");
	542	manager_dump_units(m, stdout, "\t");
	543	}
d46de8a1	544
8f5847c4 LP	545	if ((r = manager_add_job(m, JOB_START, target, JOB_REPLACE, false, &job)) < 0) {
	546	log_error("Failed to start default target: %s", strerror(-r));
	547	goto finish;
	548	}
11dd41ce	549
e965d56d LP	550	if (action == ACTION_TEST) {
	551	printf("→ By jobs:\n");
	552	manager_dump_jobs(m, stdout, "\t");
	553
	554	if (getpid() == 1)
	555	pause();
	556
	557	retval = 0;
	558	goto finish;
	559	}
cea8e32e	560
c20cae32 LP	561	if ((r = manager_loop(m)) < 0) {
	562	log_error("Failed to run mainloop: %s", strerror(-r));
	563	goto finish;
	564	}
9152c765	565
60918275 LP	566	retval = 0;
60918275 LP	567
f170852a LP	568	log_debug("Exit.");
f170852a LP	569
60918275 LP	570	finish:
	571	if (m)
	572	manager_free(m);
	573
f170852a	574	free(default_unit);
b9cd2ec1	575
ea430986 LP	576	dbus_shutdown();
ea430986 LP	577
60918275 LP	578	return retval;
60918275 LP	579	}