[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 <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) {
                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 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. */
        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);

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