/*-*- 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;
- Name *milestone = NULL, *syslog = NULL;
+ Unit *target = NULL;
Job *job = NULL;
int r, retval = 1;
- if (!(m = manager_new()) < 0) {
- fprintf(stderr, "Failed to allocate manager object: %s\n", strerror(ENOMEM));
+ 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();
- if ((r = manager_load_name(m, "default.milestone", &milestone) < 0)) {
- fprintf(stderr, "Failed to load default milestone: %s\n", strerror(-r));
+ /* 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_load_name(m, "syslog.socket", &syslog) < 0)) {
- fprintf(stderr, "Failed to load syslog socket: %s\n", strerror(-r));
+ if ((r = manager_coldplug(m)) < 0) {
+ log_error("Failed to retrieve coldplug information: %s", strerror(-r));
goto finish;
}
- if ((r = manager_add_job(m, JOB_START, milestone, JOB_REPLACE, false, &job)) < 0) {
- fprintf(stderr, "Failed to start default milestone: %s\n", strerror(-r));
+ 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;
}
- printf("- By names:\n");
- manager_dump_names(m, stdout, "\t");
+ if (action == ACTION_TEST) {
+ printf("→ By jobs:\n");
+ manager_dump_jobs(m, stdout, "\t");
- printf("- By jobs:\n");
- manager_dump_jobs(m, stdout, "\t");
+ if (getpid() == 1)
+ pause();
- if ((r = manager_add_job(m, JOB_STOP, syslog, JOB_REPLACE, false, &job)) < 0) {
- fprintf(stderr, "Failed to start default milestone: %s\n", strerror(-r));
+ retval = 0;
goto finish;
}
- printf("- By jobs:\n");
- manager_dump_jobs(m, stdout, "\t");
+ 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;
}
~ianmdlvl / elogind.git / blobdiff