/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/ /*** 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 Lesser General Public License as published by the Free Software Foundation; either version 2.1 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 Lesser General Public License for more details. You should have received a copy of the GNU Lesser 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 <sys/prctl.h> #include <sys/mount.h> #include "manager.h" #include "log.h" #include "load-fragment.h" #include "fdset.h" #include "special.h" #include "conf-parser.h" #include "bus-errors.h" #include "missing.h" #include "label.h" #include "build.h" #include "strv.h" #include "def.h" #include "virt.h" #include "watchdog.h" #include "path-util.h" #include "switch-root.h" #include "capability.h" #include "killall.h" #include "env-util.h" #include "hwclock.h" #include "sd-daemon.h" #include "mount-setup.h" #include "loopback-setup.h" #ifdef HAVE_KMOD #include "kmod-setup.h" #endif #include "hostname-setup.h" #include "machine-id-setup.h" #include "locale-setup.h" #include "selinux-setup.h" #include "ima-setup.h" #include "fileio.h" #include "smack-setup.h" static enum { ACTION_RUN, ACTION_HELP, ACTION_VERSION, ACTION_TEST, ACTION_DUMP_CONFIGURATION_ITEMS, ACTION_DONE } arg_action = ACTION_RUN; static char *arg_default_unit = NULL; static SystemdRunningAs arg_running_as = _SYSTEMD_RUNNING_AS_INVALID; static bool arg_dump_core = true; static bool arg_crash_shell = false; static int arg_crash_chvt = -1; static bool arg_confirm_spawn = false; static bool arg_show_status = true; static bool arg_switched_root = false; static char **arg_default_controllers = NULL; static char ***arg_join_controllers = NULL; static ExecOutput arg_default_std_output = EXEC_OUTPUT_JOURNAL; static ExecOutput arg_default_std_error = EXEC_OUTPUT_INHERIT; static usec_t arg_runtime_watchdog = 0; static usec_t arg_shutdown_watchdog = 10 * USEC_PER_MINUTE; static struct rlimit *arg_default_rlimit[RLIMIT_NLIMITS] = {}; static uint64_t arg_capability_bounding_set_drop = 0; static nsec_t arg_timer_slack_nsec = (nsec_t) -1; static FILE* serialization = NULL; static void nop_handler(int sig) { } _noreturn_ static void crash(int sig) { if (!arg_dump_core) log_error("Caught <%s>, not dumping core.", signal_to_string(sig)); else { struct sigaction sa; pid_t pid; /* We want to wait for the core process, hence let's enable SIGCHLD */ zero(sa); sa.sa_handler = nop_handler; sa.sa_flags = SA_NOCLDSTOP|SA_RESTART; assert_se(sigaction(SIGCHLD, &sa, NULL) == 0); pid = fork(); if (pid < 0) log_error("Caught <%s>, cannot fork for core dump: %s", signal_to_string(sig), strerror(errno)); else if (pid == 0) { 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 { siginfo_t status; int r; /* Order things nicely. */ r = wait_for_terminate(pid, &status); if (r < 0) log_error("Caught <%s>, waitpid() failed: %s", signal_to_string(sig), strerror(-r)); else if (status.si_code != CLD_DUMPED) log_error("Caught <%s>, core dump failed.", signal_to_string(sig)); else log_error("Caught <%s>, dumped core as pid %lu.", signal_to_string(sig), (unsigned long) pid); } } if (arg_crash_chvt) chvt(arg_crash_chvt); if (arg_crash_shell) { struct sigaction sa; pid_t pid; log_info("Executing crash shell in 10s..."); sleep(10); /* Let the kernel reap children for us */ zero(sa); sa.sa_handler = SIG_IGN; sa.sa_flags = SA_NOCLDSTOP|SA_NOCLDWAIT|SA_RESTART; assert_se(sigaction(SIGCHLD, &sa, NULL) == 0); pid = fork(); if (pid < 0) log_error("Failed to fork off crash shell: %m"); else if (pid == 0) { make_console_stdio(); execl("/bin/sh", "/bin/sh", NULL); log_error("execl() failed: %m"); _exit(1); } log_info("Successfully spawned crash shell as pid %lu.", (unsigned long) pid); } 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; sigaction_many(&sa, SIGNALS_CRASH_HANDLER, -1); } static int console_setup(bool do_reset) { int tty_fd, r; /* If we are init, we connect stdin/stdout/stderr to /dev/null * and make sure we don't have a controlling tty. */ release_terminal(); if (!do_reset) return 0; tty_fd = open_terminal("/dev/console", O_WRONLY|O_NOCTTY|O_CLOEXEC); if (tty_fd < 0) { log_error("Failed to open /dev/console: %s", strerror(-tty_fd)); return -tty_fd; } /* We don't want to force text mode. * plymouth may be showing pictures already from initrd. */ r = reset_terminal_fd(tty_fd, false); if (r < 0) log_error("Failed to reset /dev/console: %s", strerror(-r)); close_nointr_nofail(tty_fd); return r; } static int set_default_unit(const char *u) { char *c; assert(u); c = strdup(u); if (!c) return -ENOMEM; free(arg_default_unit); arg_default_unit = c; return 0; } static int parse_proc_cmdline_word(const char *word) { static const char * const rlmap[] = { "emergency", SPECIAL_EMERGENCY_TARGET, "-b", SPECIAL_EMERGENCY_TARGET, "single", SPECIAL_RESCUE_TARGET, "-s", SPECIAL_RESCUE_TARGET, "s", SPECIAL_RESCUE_TARGET, "S", SPECIAL_RESCUE_TARGET, "1", SPECIAL_RESCUE_TARGET, "2", SPECIAL_RUNLEVEL2_TARGET, "3", SPECIAL_RUNLEVEL3_TARGET, "4", SPECIAL_RUNLEVEL4_TARGET, "5", SPECIAL_RUNLEVEL5_TARGET, }; assert(word); if (startswith(word, "systemd.unit=")) { if (!in_initrd()) return set_default_unit(word + 13); } else if (startswith(word, "rd.systemd.unit=")) { if (in_initrd()) 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.log_color=")) { if (log_show_color_from_string(word + 18) < 0) log_warning("Failed to parse log color setting %s. Ignoring.", word + 18); } else if (startswith(word, "systemd.log_location=")) { if (log_show_location_from_string(word + 21) < 0) log_warning("Failed to parse log location setting %s. Ignoring.", word + 21); } 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 arg_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 arg_crash_shell = r; } else if (startswith(word, "systemd.confirm_spawn=")) { int r; if ((r = parse_boolean(word + 22)) < 0) log_warning("Failed to parse confirm spawn switch %s. Ignoring.", word + 22); else arg_confirm_spawn = 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 arg_crash_chvt = k; } else if (startswith(word, "systemd.show_status=")) { int r; if ((r = parse_boolean(word + 20)) < 0) log_warning("Failed to parse show status switch %s. Ignoring.", word + 20); else arg_show_status = r; } else if (startswith(word, "systemd.default_standard_output=")) { int r; if ((r = exec_output_from_string(word + 32)) < 0) log_warning("Failed to parse default standard output switch %s. Ignoring.", word + 32); else arg_default_std_output = r; } else if (startswith(word, "systemd.default_standard_error=")) { int r; if ((r = exec_output_from_string(word + 31)) < 0) log_warning("Failed to parse default standard error switch %s. Ignoring.", word + 31); else arg_default_std_error = r; } else if (startswith(word, "systemd.setenv=")) { _cleanup_free_ char *cenv = NULL; char *eq; int r; cenv = strdup(word + 15); if (!cenv) return -ENOMEM; eq = strchr(cenv, '='); if (!eq) { if (!env_name_is_valid(cenv)) log_warning("Environment variable name '%s' is not valid. Ignoring.", cenv); else { r = unsetenv(cenv); if (r < 0) log_warning("Unsetting environment variable '%s' failed, ignoring: %m", cenv); } } else { if (!env_assignment_is_valid(cenv)) log_warning("Environment variable assignment '%s' is not valid. Ignoring.", cenv); else { *eq = 0; r = setenv(cenv, eq + 1, 1); if (r < 0) log_warning("Setting environment variable '%s=%s' failed, ignoring: %m", cenv, eq + 1); } } } else if (startswith(word, "systemd.") || (in_initrd() && startswith(word, "rd.systemd."))) { const char *c; /* Ignore systemd.journald.xyz and friends */ c = word; if (startswith(c, "rd.")) c += 3; if (startswith(c, "systemd.")) c += 8; if (c[strcspn(c, ".=")] != '.') { log_warning("Unknown kernel switch %s. Ignoring.", word); log_info("Supported kernel switches:\n" "systemd.unit=UNIT Default unit to start\n" "rd.systemd.unit=UNIT Default unit to start when run in initrd\n" "systemd.dump_core=0|1 Dump core on crash\n" "systemd.crash_shell=0|1 Run shell on crash\n" "systemd.crash_chvt=N Change to VT #N on crash\n" "systemd.confirm_spawn=0|1 Confirm every process spawn\n" "systemd.show_status=0|1 Show status updates on the console during bootup\n" "systemd.log_target=console|kmsg|journal|journal-or-kmsg|syslog|syslog-or-kmsg|null\n" " Log target\n" "systemd.log_level=LEVEL Log level\n" "systemd.log_color=0|1 Highlight important log messages\n" "systemd.log_location=0|1 Include code location in log messages\n" "systemd.default_standard_output=null|tty|syslog|syslog+console|kmsg|kmsg+console|journal|journal+console\n" " Set default log output for services\n" "systemd.default_standard_error=null|tty|syslog|syslog+console|kmsg|kmsg+console|journal|journal+console\n" " Set default log error output for services\n" "systemd.setenv=ASSIGNMENT Set an environment variable for all spawned processes\n"); } } else if (streq(word, "quiet")) arg_show_status = false; else if (!in_initrd()) { 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 config_parse_level2( const char *filename, unsigned line, const char *section, const char *lvalue, int ltype, const char *rvalue, void *data, void *userdata) { assert(filename); assert(lvalue); assert(rvalue); log_set_max_level_from_string(rvalue); return 0; } static int config_parse_target( const char *filename, unsigned line, const char *section, const char *lvalue, int ltype, const char *rvalue, void *data, void *userdata) { assert(filename); assert(lvalue); assert(rvalue); log_set_target_from_string(rvalue); return 0; } static int config_parse_color( const char *filename, unsigned line, const char *section, const char *lvalue, int ltype, const char *rvalue, void *data, void *userdata) { assert(filename); assert(lvalue); assert(rvalue); log_show_color_from_string(rvalue); return 0; } static int config_parse_location( const char *filename, unsigned line, const char *section, const char *lvalue, int ltype, const char *rvalue, void *data, void *userdata) { assert(filename); assert(lvalue); assert(rvalue); log_show_location_from_string(rvalue); return 0; } static int config_parse_cpu_affinity2( const char *filename, unsigned line, const char *section, const char *lvalue, int ltype, const char *rvalue, void *data, void *userdata) { char *w; size_t l; char *state; cpu_set_t *c = NULL; unsigned ncpus = 0; assert(filename); assert(lvalue); assert(rvalue); FOREACH_WORD_QUOTED(w, l, rvalue, state) { char *t; int r; unsigned cpu; if (!(t = strndup(w, l))) return log_oom(); r = safe_atou(t, &cpu); free(t); if (!c) if (!(c = cpu_set_malloc(&ncpus))) return log_oom(); if (r < 0 || cpu >= ncpus) { log_error("[%s:%u] Failed to parse CPU affinity: %s", filename, line, rvalue); CPU_FREE(c); return -EBADMSG; } CPU_SET_S(cpu, CPU_ALLOC_SIZE(ncpus), c); } if (c) { if (sched_setaffinity(0, CPU_ALLOC_SIZE(ncpus), c) < 0) log_warning("Failed to set CPU affinity: %m"); CPU_FREE(c); } return 0; } static void strv_free_free(char ***l) { char ***i; if (!l) return; for (i = l; *i; i++) strv_free(*i); free(l); } static void free_join_controllers(void) { if (!arg_join_controllers) return; strv_free_free(arg_join_controllers); arg_join_controllers = NULL; } static int config_parse_join_controllers( const char *filename, unsigned line, const char *section, const char *lvalue, int ltype, const char *rvalue, void *data, void *userdata) { unsigned n = 0; char *state, *w; size_t length; assert(filename); assert(lvalue); assert(rvalue); free_join_controllers(); FOREACH_WORD_QUOTED(w, length, rvalue, state) { char *s, **l; s = strndup(w, length); if (!s) return log_oom(); l = strv_split(s, ","); free(s); strv_uniq(l); if (strv_length(l) <= 1) { strv_free(l); continue; } if (!arg_join_controllers) { arg_join_controllers = new(char**, 2); if (!arg_join_controllers) { strv_free(l); return log_oom(); } arg_join_controllers[0] = l; arg_join_controllers[1] = NULL; n = 1; } else { char ***a; char ***t; t = new0(char**, n+2); if (!t) { strv_free(l); return log_oom(); } n = 0; for (a = arg_join_controllers; *a; a++) { if (strv_overlap(*a, l)) { char **c; c = strv_merge(*a, l); if (!c) { strv_free(l); strv_free_free(t); return log_oom(); } strv_free(l); l = c; } else { char **c; c = strv_copy(*a); if (!c) { strv_free(l); strv_free_free(t); return log_oom(); } t[n++] = c; } } t[n++] = strv_uniq(l); strv_free_free(arg_join_controllers); arg_join_controllers = t; } } return 0; } static int parse_config_file(void) { const ConfigTableItem items[] = { { "Manager", "LogLevel", config_parse_level2, 0, NULL }, { "Manager", "LogTarget", config_parse_target, 0, NULL }, { "Manager", "LogColor", config_parse_color, 0, NULL }, { "Manager", "LogLocation", config_parse_location, 0, NULL }, { "Manager", "DumpCore", config_parse_bool, 0, &arg_dump_core }, { "Manager", "CrashShell", config_parse_bool, 0, &arg_crash_shell }, { "Manager", "ShowStatus", config_parse_bool, 0, &arg_show_status }, { "Manager", "CrashChVT", config_parse_int, 0, &arg_crash_chvt }, { "Manager", "CPUAffinity", config_parse_cpu_affinity2, 0, NULL }, { "Manager", "DefaultControllers", config_parse_strv, 0, &arg_default_controllers }, { "Manager", "DefaultStandardOutput", config_parse_output, 0, &arg_default_std_output }, { "Manager", "DefaultStandardError", config_parse_output, 0, &arg_default_std_error }, { "Manager", "JoinControllers", config_parse_join_controllers, 0, &arg_join_controllers }, { "Manager", "RuntimeWatchdogSec", config_parse_sec, 0, &arg_runtime_watchdog }, { "Manager", "ShutdownWatchdogSec", config_parse_sec, 0, &arg_shutdown_watchdog }, { "Manager", "CapabilityBoundingSet", config_parse_bounding_set, 0, &arg_capability_bounding_set_drop }, { "Manager", "TimerSlackNSec", config_parse_nsec, 0, &arg_timer_slack_nsec }, { "Manager", "DefaultLimitCPU", config_parse_limit, 0, &arg_default_rlimit[RLIMIT_CPU]}, { "Manager", "DefaultLimitFSIZE", config_parse_limit, 0, &arg_default_rlimit[RLIMIT_FSIZE]}, { "Manager", "DefaultLimitDATA", config_parse_limit, 0, &arg_default_rlimit[RLIMIT_DATA]}, { "Manager", "DefaultLimitSTACK", config_parse_limit, 0, &arg_default_rlimit[RLIMIT_STACK]}, { "Manager", "DefaultLimitCORE", config_parse_limit, 0, &arg_default_rlimit[RLIMIT_CORE]}, { "Manager", "DefaultLimitRSS", config_parse_limit, 0, &arg_default_rlimit[RLIMIT_RSS]}, { "Manager", "DefaultLimitNOFILE", config_parse_limit, 0, &arg_default_rlimit[RLIMIT_NOFILE]}, { "Manager", "DefaultLimitAS", config_parse_limit, 0, &arg_default_rlimit[RLIMIT_AS]}, { "Manager", "DefaultLimitNPROC", config_parse_limit, 0, &arg_default_rlimit[RLIMIT_NPROC]}, { "Manager", "DefaultLimitMEMLOCK", config_parse_limit, 0, &arg_default_rlimit[RLIMIT_MEMLOCK]}, { "Manager", "DefaultLimitLOCKS", config_parse_limit, 0, &arg_default_rlimit[RLIMIT_LOCKS]}, { "Manager", "DefaultLimitSIGPENDING",config_parse_limit, 0, &arg_default_rlimit[RLIMIT_SIGPENDING]}, { "Manager", "DefaultLimitMSGQUEUE", config_parse_limit, 0, &arg_default_rlimit[RLIMIT_MSGQUEUE]}, { "Manager", "DefaultLimitNICE", config_parse_limit, 0, &arg_default_rlimit[RLIMIT_NICE]}, { "Manager", "DefaultLimitRTPRIO", config_parse_limit, 0, &arg_default_rlimit[RLIMIT_RTPRIO]}, { "Manager", "DefaultLimitRTTIME", config_parse_limit, 0, &arg_default_rlimit[RLIMIT_RTTIME]}, { NULL, NULL, NULL, 0, NULL } }; FILE *f; const char *fn; int r; fn = arg_running_as == SYSTEMD_SYSTEM ? SYSTEM_CONFIG_FILE : USER_CONFIG_FILE; f = fopen(fn, "re"); if (!f) { if (errno == ENOENT) return 0; log_warning("Failed to open configuration file '%s': %m", fn); return 0; } r = config_parse(fn, f, "Manager\0", config_item_table_lookup, (void*) items, false, NULL); if (r < 0) log_warning("Failed to parse configuration file: %s", strerror(-r)); fclose(f); return 0; } static int parse_proc_cmdline(void) { char *line, *w, *state; int r; size_t l; /* Don't read /proc/cmdline if we are in a container, since * that is only relevant for the host system */ if (detect_container(NULL) > 0) return 0; if ((r = read_one_line_file("/proc/cmdline", &line)) < 0) { log_warning("Failed to read /proc/cmdline, ignoring: %s", strerror(-r)); 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); if (r < 0) { log_error("Failed on cmdline argument %s: %s", word, strerror(-r)); free(word); goto finish; } free(word); } r = 0; finish: free(line); return r; } static int parse_argv(int argc, char *argv[]) { enum { ARG_LOG_LEVEL = 0x100, ARG_LOG_TARGET, ARG_LOG_COLOR, ARG_LOG_LOCATION, ARG_UNIT, ARG_SYSTEM, ARG_USER, ARG_TEST, ARG_VERSION, ARG_DUMP_CONFIGURATION_ITEMS, ARG_DUMP_CORE, ARG_CRASH_SHELL, ARG_CONFIRM_SPAWN, ARG_SHOW_STATUS, ARG_DESERIALIZE, ARG_SWITCHED_ROOT, ARG_INTROSPECT, ARG_DEFAULT_STD_OUTPUT, ARG_DEFAULT_STD_ERROR }; static const struct option options[] = { { "log-level", required_argument, NULL, ARG_LOG_LEVEL }, { "log-target", required_argument, NULL, ARG_LOG_TARGET }, { "log-color", optional_argument, NULL, ARG_LOG_COLOR }, { "log-location", optional_argument, NULL, ARG_LOG_LOCATION }, { "unit", required_argument, NULL, ARG_UNIT }, { "system", no_argument, NULL, ARG_SYSTEM }, { "user", no_argument, NULL, ARG_USER }, { "test", no_argument, NULL, ARG_TEST }, { "help", no_argument, NULL, 'h' }, { "version", no_argument, NULL, ARG_VERSION }, { "dump-configuration-items", no_argument, NULL, ARG_DUMP_CONFIGURATION_ITEMS }, { "dump-core", optional_argument, NULL, ARG_DUMP_CORE }, { "crash-shell", optional_argument, NULL, ARG_CRASH_SHELL }, { "confirm-spawn", optional_argument, NULL, ARG_CONFIRM_SPAWN }, { "show-status", optional_argument, NULL, ARG_SHOW_STATUS }, { "deserialize", required_argument, NULL, ARG_DESERIALIZE }, { "switched-root", no_argument, NULL, ARG_SWITCHED_ROOT }, { "introspect", optional_argument, NULL, ARG_INTROSPECT }, { "default-standard-output", required_argument, NULL, ARG_DEFAULT_STD_OUTPUT, }, { "default-standard-error", required_argument, NULL, ARG_DEFAULT_STD_ERROR, }, { NULL, 0, NULL, 0 } }; int c, r; assert(argc >= 1); assert(argv); if (getpid() == 1) opterr = 0; while ((c = getopt_long(argc, argv, "hDbsz:", 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_LOG_COLOR: if (optarg) { if ((r = log_show_color_from_string(optarg)) < 0) { log_error("Failed to parse log color setting %s.", optarg); return r; } } else log_show_color(true); break; case ARG_LOG_LOCATION: if (optarg) { if ((r = log_show_location_from_string(optarg)) < 0) { log_error("Failed to parse log location setting %s.", optarg); return r; } } else log_show_location(true); break; case ARG_DEFAULT_STD_OUTPUT: if ((r = exec_output_from_string(optarg)) < 0) { log_error("Failed to parse default standard output setting %s.", optarg); return r; } else arg_default_std_output = r; break; case ARG_DEFAULT_STD_ERROR: if ((r = exec_output_from_string(optarg)) < 0) { log_error("Failed to parse default standard error output setting %s.", optarg); return r; } else arg_default_std_error = r; break; case ARG_UNIT: if ((r = set_default_unit(optarg)) < 0) { log_error("Failed to set default unit %s: %s", optarg, strerror(-r)); return r; } break; case ARG_SYSTEM: arg_running_as = SYSTEMD_SYSTEM; break; case ARG_USER: arg_running_as = SYSTEMD_USER; break; case ARG_TEST: arg_action = ACTION_TEST; break; case ARG_VERSION: arg_action = ACTION_VERSION; break; case ARG_DUMP_CONFIGURATION_ITEMS: arg_action = ACTION_DUMP_CONFIGURATION_ITEMS; break; case ARG_DUMP_CORE: r = optarg ? parse_boolean(optarg) : 1; if (r < 0) { log_error("Failed to parse dump core boolean %s.", optarg); return r; } arg_dump_core = r; break; case ARG_CRASH_SHELL: r = optarg ? parse_boolean(optarg) : 1; if (r < 0) { log_error("Failed to parse crash shell boolean %s.", optarg); return r; } arg_crash_shell = r; break; case ARG_CONFIRM_SPAWN: r = optarg ? parse_boolean(optarg) : 1; if (r < 0) { log_error("Failed to parse confirm spawn boolean %s.", optarg); return r; } arg_confirm_spawn = r; break; case ARG_SHOW_STATUS: r = optarg ? parse_boolean(optarg) : 1; if (r < 0) { log_error("Failed to parse show status boolean %s.", optarg); return r; } arg_show_status = r; break; case ARG_DESERIALIZE: { int fd; FILE *f; r = safe_atoi(optarg, &fd); if (r < 0 || fd < 0) { log_error("Failed to parse deserialize option %s.", optarg); return r < 0 ? r : -EINVAL; } fd_cloexec(fd, true); f = fdopen(fd, "r"); if (!f) { log_error("Failed to open serialization fd: %m"); return -errno; } if (serialization) fclose(serialization); serialization = f; break; } case ARG_SWITCHED_ROOT: arg_switched_root = true; break; case ARG_INTROSPECT: { const char * const * i = NULL; for (i = bus_interface_table; *i; i += 2) if (!optarg || streq(i[0], optarg)) { fputs(DBUS_INTROSPECT_1_0_XML_DOCTYPE_DECL_NODE "<node>\n", stdout); fputs(i[1], stdout); fputs("</node>\n", stdout); if (optarg) break; } if (!i[0] && optarg) log_error("Unknown interface %s.", optarg); arg_action = ACTION_DONE; break; } case 'h': arg_action = ACTION_HELP; break; case 'D': log_set_max_level(LOG_DEBUG); break; case 'b': case 's': case 'z': /* Just to eat away the sysvinit kernel * cmdline args without getopt() error * messages that we'll parse in * parse_proc_cmdline_word() or ignore. */ case '?': default: if (getpid() != 1) { log_error("Unknown option code %c", c); return -EINVAL; } break; } if (optind < argc && getpid() != 1) { /* Hmm, when we aren't run as init system * let's complain about excess arguments */ log_error("Excess arguments."); return -EINVAL; } if (detect_container(NULL) > 0) { char **a; /* All /proc/cmdline arguments the kernel didn't * understand it passed to us. We're not really * interested in that usually since /proc/cmdline is * more interesting and complete. With one exception: * if we are run in a container /proc/cmdline is not * relevant for the container, hence we rely on argv[] * instead. */ for (a = argv; a < argv + argc; a++) if ((r = parse_proc_cmdline_word(*a)) < 0) { log_error("Failed on cmdline argument %s: %s", *a, strerror(-r)); return r; } } return 0; } static int help(void) { printf("%s [OPTIONS...]\n\n" "Starts up and maintains the system or user services.\n\n" " -h --help Show this help\n" " --test Determine startup sequence, dump it and exit\n" " --dump-configuration-items Dump understood unit configuration items\n" " --introspect[=INTERFACE] Extract D-Bus interface data\n" " --unit=UNIT Set default unit\n" " --system Run a system instance, even if PID != 1\n" " --user Run a user instance\n" " --dump-core[=0|1] Dump core on crash\n" " --crash-shell[=0|1] Run shell on crash\n" " --confirm-spawn[=0|1] Ask for confirmation when spawning processes\n" " --show-status[=0|1] Show status updates on the console during bootup\n" " --log-target=TARGET Set log target (console, journal, syslog, kmsg, journal-or-kmsg, syslog-or-kmsg, null)\n" " --log-level=LEVEL Set log level (debug, info, notice, warning, err, crit, alert, emerg)\n" " --log-color[=0|1] Highlight important log messages\n" " --log-location[=0|1] Include code location in log messages\n" " --default-standard-output= Set default standard output for services\n" " --default-standard-error= Set default standard error output for services\n", program_invocation_short_name); return 0; } static int version(void) { puts(PACKAGE_STRING); puts(SYSTEMD_FEATURES); return 0; } static int prepare_reexecute(Manager *m, FILE **_f, FDSet **_fds, bool serialize_jobs) { FILE *f = NULL; FDSet *fds = NULL; int r; assert(m); assert(_f); assert(_fds); /* Make sure nothing is really destructed when we shut down */ m->n_reloading ++; r = manager_open_serialization(m, &f); if (r < 0) { log_error("Failed to create serialization file: %s", strerror(-r)); goto fail; } fds = fdset_new(); if (!fds) { r = -ENOMEM; log_error("Failed to allocate fd set: %s", strerror(-r)); goto fail; } r = manager_serialize(m, f, fds, serialize_jobs); if (r < 0) { log_error("Failed to serialize state: %s", strerror(-r)); goto fail; } if (fseeko(f, 0, SEEK_SET) < 0) { log_error("Failed to rewind serialization fd: %m"); goto fail; } r = fd_cloexec(fileno(f), false); if (r < 0) { log_error("Failed to disable O_CLOEXEC for serialization: %s", strerror(-r)); goto fail; } r = fdset_cloexec(fds, false); if (r < 0) { log_error("Failed to disable O_CLOEXEC for serialization fds: %s", strerror(-r)); goto fail; } *_f = f; *_fds = fds; return 0; fail: fdset_free(fds); if (f) fclose(f); return r; } static int bump_rlimit_nofile(struct rlimit *saved_rlimit) { struct rlimit nl; int r; assert(saved_rlimit); /* Save the original RLIMIT_NOFILE so that we can reset it * later when transitioning from the initrd to the main * systemd or suchlike. */ if (getrlimit(RLIMIT_NOFILE, saved_rlimit) < 0) { log_error("Reading RLIMIT_NOFILE failed: %m"); return -errno; } /* Make sure forked processes get the default kernel setting */ if (!arg_default_rlimit[RLIMIT_NOFILE]) { struct rlimit *rl; rl = newdup(struct rlimit, saved_rlimit, 1); if (!rl) return log_oom(); arg_default_rlimit[RLIMIT_NOFILE] = rl; } /* Bump up the resource limit for ourselves substantially */ nl.rlim_cur = nl.rlim_max = 64*1024; r = setrlimit_closest(RLIMIT_NOFILE, &nl); if (r < 0) { log_error("Setting RLIMIT_NOFILE failed: %s", strerror(-r)); return r; } return 0; } static struct dual_timestamp* parse_initrd_timestamp(struct dual_timestamp *t) { const char *e; unsigned long long a, b; assert(t); e = getenv("RD_TIMESTAMP"); if (!e) return NULL; if (sscanf(e, "%llu %llu", &a, &b) != 2) return NULL; t->realtime = (usec_t) a; t->monotonic = (usec_t) b; return t; } static void test_mtab(void) { char *p; /* Check that /etc/mtab is a symlink */ if (readlink_malloc("/etc/mtab", &p) >= 0) { bool b; b = streq(p, "/proc/self/mounts") || streq(p, "/proc/mounts"); free(p); if (b) return; } log_warning("/etc/mtab is not a symlink or not pointing to /proc/self/mounts. " "This is not supported anymore. " "Please make sure to replace this file by a symlink to avoid incorrect or misleading mount(8) output."); } static void test_usr(void) { /* Check that /usr is not a separate fs */ if (dir_is_empty("/usr") <= 0) return; log_warning("/usr appears to be on its own filesytem and is not already mounted. This is not a supported setup. " "Some things will probably break (sometimes even silently) in mysterious ways. " "Consult http://freedesktop.org/wiki/Software/systemd/separate-usr-is-broken for more information."); } static void test_cgroups(void) { if (access("/proc/cgroups", F_OK) >= 0) return; log_warning("CONFIG_CGROUPS was not set when your kernel was compiled. " "Systems without control groups are not supported. " "We will now sleep for 10s, and then continue boot-up. " "Expect breakage and please do not file bugs. " "Instead fix your kernel and enable CONFIG_CGROUPS. " "Consult http://0pointer.de/blog/projects/cgroups-vs-cgroups.html for more information."); sleep(10); } static int initialize_join_controllers(void) { /* By default, mount "cpu" + "cpuacct" together, and "net_cls" * + "net_prio". We'd like to add "cpuset" to the mix, but * "cpuset" does't really work for groups with no initialized * attributes. */ arg_join_controllers = new(char**, 3); if (!arg_join_controllers) return -ENOMEM; arg_join_controllers[0] = strv_new("cpu", "cpuacct", NULL); if (!arg_join_controllers[0]) return -ENOMEM; arg_join_controllers[1] = strv_new("net_cls", "net_prio", NULL); if (!arg_join_controllers[1]) return -ENOMEM; arg_join_controllers[2] = NULL; return 0; } int main(int argc, char *argv[]) { Manager *m = NULL; int r, retval = EXIT_FAILURE; usec_t before_startup, after_startup; char timespan[FORMAT_TIMESPAN_MAX]; FDSet *fds = NULL; bool reexecute = false; const char *shutdown_verb = NULL; dual_timestamp initrd_timestamp = { 0ULL, 0ULL }; static char systemd[] = "systemd"; bool skip_setup = false; int j; bool loaded_policy = false; bool arm_reboot_watchdog = false; bool queue_default_job = false; char *switch_root_dir = NULL, *switch_root_init = NULL; static struct rlimit saved_rlimit_nofile = { 0, 0 }; #ifdef HAVE_SYSV_COMPAT if (getpid() != 1 && strstr(program_invocation_short_name, "init")) { /* This is compatibility support for SysV, where * calling init as a user is identical to telinit. */ errno = -ENOENT; execv(SYSTEMCTL_BINARY_PATH, argv); log_error("Failed to exec " SYSTEMCTL_BINARY_PATH ": %m"); return 1; } #endif /* Determine if this is a reexecution or normal bootup. We do * the full command line parsing much later, so let's just * have a quick peek here. */ if (strv_find(argv+1, "--deserialize")) skip_setup = true; /* If we have switched root, do all the special setup * things */ if (strv_find(argv+1, "--switched-root")) skip_setup = false; /* If we get started via the /sbin/init symlink then we are called 'init'. After a subsequent reexecution we are then called 'systemd'. That is confusing, hence let's call us systemd right-away. */ program_invocation_short_name = systemd; prctl(PR_SET_NAME, systemd); saved_argv = argv; saved_argc = argc; log_show_color(isatty(STDERR_FILENO) > 0); if (getpid() == 1 && detect_container(NULL) <= 0) { /* Running outside of a container as PID 1 */ arg_running_as = SYSTEMD_SYSTEM; make_null_stdio(); log_set_target(LOG_TARGET_KMSG); log_open(); if (in_initrd()) { char *rd_timestamp = NULL; dual_timestamp_get(&initrd_timestamp); asprintf(&rd_timestamp, "%llu %llu", (unsigned long long) initrd_timestamp.realtime, (unsigned long long) initrd_timestamp.monotonic); if (rd_timestamp) { setenv("RD_TIMESTAMP", rd_timestamp, 1); free(rd_timestamp); } } if (!skip_setup) { mount_setup_early(); if (selinux_setup(&loaded_policy) < 0) goto finish; if (ima_setup() < 0) goto finish; if (smack_setup() < 0) goto finish; } if (label_init(NULL) < 0) goto finish; if (!skip_setup) { if (hwclock_is_localtime() > 0) { int min; /* The first-time call to settimeofday() does a time warp in the kernel */ r = hwclock_set_timezone(&min); if (r < 0) log_error("Failed to apply local time delta, ignoring: %s", strerror(-r)); else log_info("RTC configured in localtime, applying delta of %i minutes to system time.", min); } else if (!in_initrd()) { /* * Do dummy first-time call to seal the kernel's time warp magic * * Do not call this this from inside the initrd. The initrd might not * carry /etc/adjtime with LOCAL, but the real system could be set up * that way. In such case, we need to delay the time-warp or the sealing * until we reach the real system. */ hwclock_reset_timezone(); /* Tell the kernel our time zone */ r = hwclock_set_timezone(NULL); if (r < 0) log_error("Failed to set the kernel's time zone, ignoring: %s", strerror(-r)); } } /* Set the default for later on, but don't actually * open the logs like this for now. Note that if we * are transitioning from the initrd there might still * be journal fd open, and we shouldn't attempt * opening that before we parsed /proc/cmdline which * might redirect output elsewhere. */ log_set_target(LOG_TARGET_JOURNAL_OR_KMSG); } else if (getpid() == 1) { /* Running inside a container, as PID 1 */ arg_running_as = SYSTEMD_SYSTEM; log_set_target(LOG_TARGET_CONSOLE); log_open(); /* For the later on, see above... */ log_set_target(LOG_TARGET_JOURNAL); } else { /* Running as user instance */ arg_running_as = SYSTEMD_USER; log_set_target(LOG_TARGET_AUTO); log_open(); } /* Initialize default unit */ r = set_default_unit(SPECIAL_DEFAULT_TARGET); if (r < 0) { log_error("Failed to set default unit %s: %s", SPECIAL_DEFAULT_TARGET, strerror(-r)); goto finish; } r = initialize_join_controllers(); if (r < 0) goto finish; /* Mount /proc, /sys and friends, so that /proc/cmdline and * /proc/$PID/fd is available. */ if (getpid() == 1) { r = mount_setup(loaded_policy); if (r < 0) goto finish; } /* Reset all signal handlers. */ assert_se(reset_all_signal_handlers() == 0); /* If we are init, we can block sigkill. Yay. */ ignore_signals(SIGNALS_IGNORE, -1); if (parse_config_file() < 0) goto finish; if (arg_running_as == SYSTEMD_SYSTEM) if (parse_proc_cmdline() < 0) goto finish; log_parse_environment(); if (parse_argv(argc, argv) < 0) goto finish; if (arg_action == ACTION_TEST && geteuid() == 0) { log_error("Don't run test mode as root."); goto finish; } if (arg_running_as == SYSTEMD_USER && arg_action == ACTION_RUN && sd_booted() <= 0) { log_error("Trying to run as user instance, but the system has not been booted with systemd."); goto finish; } if (arg_running_as == SYSTEMD_SYSTEM && arg_action == ACTION_RUN && running_in_chroot() > 0) { log_error("Cannot be run in a chroot() environment."); goto finish; } if (arg_action == ACTION_HELP) { retval = help(); goto finish; } else if (arg_action == ACTION_VERSION) { retval = version(); goto finish; } else if (arg_action == ACTION_DUMP_CONFIGURATION_ITEMS) { unit_dump_config_items(stdout); retval = EXIT_SUCCESS; goto finish; } else if (arg_action == ACTION_DONE) { retval = EXIT_SUCCESS; goto finish; } assert_se(arg_action == ACTION_RUN || arg_action == ACTION_TEST); /* Close logging fds, in order not to confuse fdset below */ log_close(); /* Remember open file descriptors for later deserialization */ r = fdset_new_fill(&fds); if (r < 0) { log_error("Failed to allocate fd set: %s", strerror(-r)); goto finish; } else fdset_cloexec(fds, true); if (serialization) assert_se(fdset_remove(fds, fileno(serialization)) >= 0); /* Set up PATH unless it is already set */ setenv("PATH", #ifdef HAVE_SPLIT_USR "/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin", #else "/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin", #endif arg_running_as == SYSTEMD_SYSTEM); if (arg_running_as == SYSTEMD_SYSTEM) { /* Parse the data passed to us. We leave this * variables set, but the manager later on will not * pass them on to our children. */ if (!in_initrd()) parse_initrd_timestamp(&initrd_timestamp); /* Unset some environment variables passed in from the * kernel that don't really make sense for us. */ unsetenv("HOME"); unsetenv("TERM"); /* When we are invoked by a shell, these might be set, * but make little sense to pass on */ unsetenv("PWD"); unsetenv("SHLVL"); unsetenv("_"); /* When we are invoked by a chroot-like tool such as * nspawn, these might be set, but make little sense * to pass on */ unsetenv("USER"); unsetenv("LOGNAME"); /* We suppress the socket activation env vars, as * we'll try to match *any* open fd to units if * possible. */ unsetenv("LISTEN_FDS"); unsetenv("LISTEN_PID"); /* All other variables are left as is, so that clients * can still read them via /proc/1/environ */ } /* Move out of the way, so that we won't block unmounts */ assert_se(chdir("/") == 0); if (arg_running_as == SYSTEMD_SYSTEM) { /* 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); /* Reset the console, but only if this is really init and we * are freshly booted */ if (arg_running_as == SYSTEMD_SYSTEM && arg_action == ACTION_RUN) console_setup(getpid() == 1 && !skip_setup); /* Open the logging devices, if possible and necessary */ log_open(); /* Make sure we leave a core dump without panicing the * kernel. */ if (getpid() == 1) { install_crash_handler(); r = mount_cgroup_controllers(arg_join_controllers); if (r < 0) goto finish; } if (arg_running_as == SYSTEMD_SYSTEM) { const char *virtualization = NULL; log_info(PACKAGE_STRING " running in system mode. (" SYSTEMD_FEATURES ")"); detect_virtualization(&virtualization); if (virtualization) log_info("Detected virtualization '%s'.", virtualization); if (in_initrd()) log_info("Running in initial RAM disk."); } else log_debug(PACKAGE_STRING " running in user mode. (" SYSTEMD_FEATURES ")"); if (arg_running_as == SYSTEMD_SYSTEM && !skip_setup) { locale_setup(); if (arg_show_status || plymouth_running()) status_welcome(); #ifdef HAVE_KMOD kmod_setup(); #endif hostname_setup(); machine_id_setup(); loopback_setup(); test_mtab(); test_usr(); test_cgroups(); } if (arg_running_as == SYSTEMD_SYSTEM && arg_runtime_watchdog > 0) watchdog_set_timeout(&arg_runtime_watchdog); if (arg_timer_slack_nsec != (nsec_t) -1) if (prctl(PR_SET_TIMERSLACK, arg_timer_slack_nsec) < 0) log_error("Failed to adjust timer slack: %m"); if (arg_capability_bounding_set_drop) { r = capability_bounding_set_drop(arg_capability_bounding_set_drop, true); if (r < 0) { log_error("Failed to drop capability bounding set: %s", strerror(-r)); goto finish; } r = capability_bounding_set_drop_usermode(arg_capability_bounding_set_drop); if (r < 0) { log_error("Failed to drop capability bounding set of usermode helpers: %s", strerror(-r)); goto finish; } } if (arg_running_as == SYSTEMD_USER) { /* Become reaper of our children */ if (prctl(PR_SET_CHILD_SUBREAPER, 1) < 0) { log_warning("Failed to make us a subreaper: %m"); if (errno == EINVAL) log_info("Perhaps the kernel version is too old (< 3.4?)"); } } if (arg_running_as == SYSTEMD_SYSTEM) bump_rlimit_nofile(&saved_rlimit_nofile); r = manager_new(arg_running_as, &m); if (r < 0) { log_error("Failed to allocate manager object: %s", strerror(-r)); goto finish; } m->confirm_spawn = arg_confirm_spawn; m->default_std_output = arg_default_std_output; m->default_std_error = arg_default_std_error; m->runtime_watchdog = arg_runtime_watchdog; m->shutdown_watchdog = arg_shutdown_watchdog; manager_set_default_rlimits(m, arg_default_rlimit); if (dual_timestamp_is_set(&initrd_timestamp)) m->initrd_timestamp = initrd_timestamp; if (arg_default_controllers) manager_set_default_controllers(m, arg_default_controllers); manager_set_show_status(m, arg_show_status); /* Remember whether we should queue the default job */ queue_default_job = !serialization || arg_switched_root; before_startup = now(CLOCK_MONOTONIC); r = manager_startup(m, serialization, fds); if (r < 0) log_error("Failed to fully start up daemon: %s", strerror(-r)); /* This will close all file descriptors that were opened, but * not claimed by any unit. */ fdset_free(fds); if (serialization) { fclose(serialization); serialization = NULL; } if (queue_default_job) { DBusError error; Unit *target = NULL; Job *default_unit_job; dbus_error_init(&error); log_debug("Activating default unit: %s", arg_default_unit); r = manager_load_unit(m, arg_default_unit, NULL, &error, &target); if (r < 0) { log_error("Failed to load default target: %s", bus_error(&error, r)); dbus_error_free(&error); } else if (target->load_state == UNIT_ERROR) log_error("Failed to load default target: %s", strerror(-target->load_error)); else if (target->load_state == UNIT_MASKED) log_error("Default target masked."); if (!target || target->load_state != UNIT_LOADED) { log_info("Trying to load rescue target..."); r = manager_load_unit(m, SPECIAL_RESCUE_TARGET, NULL, &error, &target); if (r < 0) { log_error("Failed to load rescue target: %s", bus_error(&error, r)); dbus_error_free(&error); goto finish; } else if (target->load_state == UNIT_ERROR) { log_error("Failed to load rescue target: %s", strerror(-target->load_error)); goto finish; } else if (target->load_state == UNIT_MASKED) { log_error("Rescue target masked."); goto finish; } } assert(target->load_state == UNIT_LOADED); if (arg_action == ACTION_TEST) { printf("-> By units:\n"); manager_dump_units(m, stdout, "\t"); } r = manager_add_job(m, JOB_START, target, JOB_ISOLATE, false, &error, &default_unit_job); if (r == -EPERM) { log_error("Default target could not be isolated, starting instead: %s", bus_error(&error, r)); dbus_error_free(&error); r = manager_add_job(m, JOB_START, target, JOB_REPLACE, false, &error, &default_unit_job); if (r < 0) { log_error("Failed to start default target: %s", bus_error(&error, r)); dbus_error_free(&error); goto finish; } } else if (r < 0) { log_error("Failed to isolate default target: %s", bus_error(&error, r)); dbus_error_free(&error); goto finish; } m->default_unit_job_id = default_unit_job->id; after_startup = now(CLOCK_MONOTONIC); log_full(arg_action == ACTION_TEST ? LOG_INFO : LOG_DEBUG, "Loaded units and determined initial transaction in %s.", format_timespan(timespan, sizeof(timespan), after_startup - before_startup, 0)); if (arg_action == ACTION_TEST) { printf("-> By jobs:\n"); manager_dump_jobs(m, stdout, "\t"); retval = EXIT_SUCCESS; goto finish; } } for (;;) { r = manager_loop(m); if (r < 0) { log_error("Failed to run mainloop: %s", strerror(-r)); goto finish; } switch (m->exit_code) { case MANAGER_EXIT: retval = EXIT_SUCCESS; log_debug("Exit."); goto finish; case MANAGER_RELOAD: log_info("Reloading."); r = manager_reload(m); if (r < 0) log_error("Failed to reload: %s", strerror(-r)); break; case MANAGER_REEXECUTE: if (prepare_reexecute(m, &serialization, &fds, true) < 0) goto finish; reexecute = true; log_notice("Reexecuting."); goto finish; case MANAGER_SWITCH_ROOT: /* Steal the switch root parameters */ switch_root_dir = m->switch_root; switch_root_init = m->switch_root_init; m->switch_root = m->switch_root_init = NULL; if (!switch_root_init) if (prepare_reexecute(m, &serialization, &fds, false) < 0) goto finish; reexecute = true; log_notice("Switching root."); goto finish; case MANAGER_REBOOT: case MANAGER_POWEROFF: case MANAGER_HALT: case MANAGER_KEXEC: { static const char * const table[_MANAGER_EXIT_CODE_MAX] = { [MANAGER_REBOOT] = "reboot", [MANAGER_POWEROFF] = "poweroff", [MANAGER_HALT] = "halt", [MANAGER_KEXEC] = "kexec" }; assert_se(shutdown_verb = table[m->exit_code]); arm_reboot_watchdog = m->exit_code == MANAGER_REBOOT; log_notice("Shutting down."); goto finish; } default: assert_not_reached("Unknown exit code."); } } finish: if (m) manager_free(m); for (j = 0; j < RLIMIT_NLIMITS; j++) free(arg_default_rlimit[j]); free(arg_default_unit); strv_free(arg_default_controllers); free_join_controllers(); dbus_shutdown(); label_finish(); if (reexecute) { const char **args; unsigned i, args_size; /* Close and disarm the watchdog, so that the new * instance can reinitialize it, but doesn't get * rebooted while we do that */ watchdog_close(true); /* Reset the RLIMIT_NOFILE to the kernel default, so * that the new systemd can pass the kernel default to * its child processes */ if (saved_rlimit_nofile.rlim_cur > 0) setrlimit(RLIMIT_NOFILE, &saved_rlimit_nofile); if (switch_root_dir) { /* Kill all remaining processes from the * initrd, but don't wait for them, so that we * can handle the SIGCHLD for them after * deserializing. */ broadcast_signal(SIGTERM, false); /* And switch root */ r = switch_root(switch_root_dir); if (r < 0) log_error("Failed to switch root, ignoring: %s", strerror(-r)); } args_size = MAX(6, argc+1); args = newa(const char*, args_size); if (!switch_root_init) { char sfd[16]; /* First try to spawn ourselves with the right * path, and with full serialization. We do * this only if the user didn't specify an * explicit init to spawn. */ assert(serialization); assert(fds); snprintf(sfd, sizeof(sfd), "%i", fileno(serialization)); char_array_0(sfd); i = 0; args[i++] = SYSTEMD_BINARY_PATH; if (switch_root_dir) args[i++] = "--switched-root"; args[i++] = arg_running_as == SYSTEMD_SYSTEM ? "--system" : "--user"; args[i++] = "--deserialize"; args[i++] = sfd; args[i++] = NULL; assert(i <= args_size); execv(args[0], (char* const*) args); } /* Try the fallback, if there is any, without any * serialization. We pass the original argv[] and * envp[]. (Well, modulo the ordering changes due to * getopt() in argv[], and some cleanups in envp[], * but let's hope that doesn't matter.) */ if (serialization) { fclose(serialization); serialization = NULL; } if (fds) { fdset_free(fds); fds = NULL; } /* Reopen the console */ make_console_stdio(); for (j = 1, i = 1; j < argc; j++) args[i++] = argv[j]; args[i++] = NULL; assert(i <= args_size); if (switch_root_init) { args[0] = switch_root_init; execv(args[0], (char* const*) args); log_warning("Failed to execute configured init, trying fallback: %m"); } args[0] = "/sbin/init"; execv(args[0], (char* const*) args); if (errno == ENOENT) { log_warning("No /sbin/init, trying fallback"); args[0] = "/bin/sh"; args[1] = NULL; execv(args[0], (char* const*) args); log_error("Failed to execute /bin/sh, giving up: %m"); } else log_warning("Failed to execute /sbin/init, giving up: %m"); } if (serialization) fclose(serialization); if (fds) fdset_free(fds); if (shutdown_verb) { const char * command_line[] = { SYSTEMD_SHUTDOWN_BINARY_PATH, shutdown_verb, NULL }; char **env_block; if (arm_reboot_watchdog && arg_shutdown_watchdog > 0) { char e[32]; /* If we reboot let's set the shutdown * watchdog and tell the shutdown binary to * repeatedly ping it */ watchdog_set_timeout(&arg_shutdown_watchdog); watchdog_close(false); /* Tell the binary how often to ping */ snprintf(e, sizeof(e), "WATCHDOG_USEC=%llu", (unsigned long long) arg_shutdown_watchdog); char_array_0(e); env_block = strv_append(environ, e); } else { env_block = strv_copy(environ); watchdog_close(true); } execve(SYSTEMD_SHUTDOWN_BINARY_PATH, (char **) command_line, env_block); free(env_block); log_error("Failed to execute shutdown binary, freezing: %m"); } if (getpid() == 1) freeze(); return retval; }