/*-*- 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 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 <sys/prctl.h> #include "manager.h" #include "log.h" #include "mount-setup.h" #include "hostname-setup.h" #include "loopback-setup.h" #include "kmod-setup.h" #include "locale-setup.h" #include "selinux-setup.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" static enum { ACTION_RUN, ACTION_HELP, ACTION_TEST, ACTION_DUMP_CONFIGURATION_ITEMS, ACTION_DONE } arg_action = ACTION_RUN; static char *arg_default_unit = NULL; static ManagerRunningAs arg_running_as = _MANAGER_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; #ifdef HAVE_SYSV_COMPAT static bool arg_sysv_console = true; #endif static bool arg_mount_auto = true; static bool arg_swap_auto = true; static char **arg_default_controllers = NULL; static ExecOutput arg_default_std_output = EXEC_OUTPUT_INHERIT; static ExecOutput arg_default_std_error = EXEC_OUTPUT_INHERIT; 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); if ((pid = fork()) < 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. */ if ((r = wait_for_terminate(pid, &status)) < 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); if ((pid = fork()) < 0) log_error("Failed to fork off crash shell: %s", strerror(errno)); else if (pid == 0) { int fd, r; if ((fd = acquire_terminal("/dev/console", false, true, true)) < 0) log_error("Failed to acquire terminal: %s", strerror(-fd)); else if ((r = make_stdio(fd)) < 0) log_error("Failed to duplicate terminal fd: %s", strerror(-r)); execl("/bin/sh", "/bin/sh", NULL); log_error("execl() failed: %s", strerror(errno)); _exit(1); } log_info("Successfully spawned crash shall 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; if ((tty_fd = open_terminal("/dev/console", O_WRONLY|O_NOCTTY|O_CLOEXEC)) < 0) { log_error("Failed to open /dev/console: %s", strerror(-tty_fd)); return -tty_fd; } if ((r = reset_terminal(tty_fd)) < 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); if (!(c = strdup(u))) 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, "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=")) return set_default_unit(word + 13); 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; #ifdef HAVE_SYSV_COMPAT } else if (startswith(word, "systemd.sysv_console=")) { int r; if ((r = parse_boolean(word + 21)) < 0) log_warning("Failed to parse SysV console switch %s, Ignoring.", word + 20); else arg_sysv_console = r; #endif } else if (startswith(word, "systemd.")) { log_warning("Unknown kernel switch %s. Ignoring.", word); log_info("Supported kernel switches:\n" "systemd.unit=UNIT Default unit to start\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" #ifdef HAVE_SYSV_COMPAT "systemd.sysv_console=0|1 Connect output of SysV scripts to console\n" #endif "systemd.log_target=console|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\n" " Set default log output for services\n" "systemd.default_standard_error=null|tty|syslog|syslog+console|kmsg|kmsg+console\n" " Set default log error output for services\n"); } else if (streq(word, "quiet")) { arg_show_status = false; #ifdef HAVE_SYSV_COMPAT arg_sysv_console = false; #endif } 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 config_parse_level( const char *filename, unsigned line, const char *section, const char *lvalue, 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, 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, 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, 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_affinity( const char *filename, unsigned line, const char *section, const char *lvalue, 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 -ENOMEM; r = safe_atou(t, &cpu); free(t); if (!c) if (!(c = cpu_set_malloc(&ncpus))) return -ENOMEM; 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 DEFINE_CONFIG_PARSE_ENUM(config_parse_output, exec_output, ExecOutput, "Failed to parse output specifier"); static int parse_config_file(void) { const ConfigItem items[] = { { "LogLevel", config_parse_level, NULL, "Manager" }, { "LogTarget", config_parse_target, NULL, "Manager" }, { "LogColor", config_parse_color, NULL, "Manager" }, { "LogLocation", config_parse_location, NULL, "Manager" }, { "DumpCore", config_parse_bool, &arg_dump_core, "Manager" }, { "CrashShell", config_parse_bool, &arg_crash_shell, "Manager" }, { "ShowStatus", config_parse_bool, &arg_show_status, "Manager" }, #ifdef HAVE_SYSV_COMPAT { "SysVConsole", config_parse_bool, &arg_sysv_console, "Manager" }, #endif { "CrashChVT", config_parse_int, &arg_crash_chvt, "Manager" }, { "CPUAffinity", config_parse_cpu_affinity, NULL, "Manager" }, { "MountAuto", config_parse_bool, &arg_mount_auto, "Manager" }, { "SwapAuto", config_parse_bool, &arg_swap_auto, "Manager" }, { "DefaultControllers", config_parse_strv, &arg_default_controllers, "Manager" }, { "DefaultStandardOutput", config_parse_output, &arg_default_std_output, "Manager" }, { "DefaultStandardError", config_parse_output, &arg_default_std_error, "Manager" }, { NULL, NULL, NULL, NULL } }; static const char * const sections[] = { "Manager", NULL }; FILE *f; const char *fn; int r; fn = arg_running_as == MANAGER_SYSTEM ? SYSTEM_CONFIG_FILE : USER_CONFIG_FILE; if (!(f = fopen(fn, "re"))) { if (errno == ENOENT) return 0; log_warning("Failed to open configuration file '%s': %m", fn); return 0; } if ((r = config_parse(fn, f, sections, items, false, NULL)) < 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; 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); 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_LOG_COLOR, ARG_LOG_LOCATION, ARG_UNIT, ARG_SYSTEM, ARG_USER, ARG_TEST, ARG_DUMP_CONFIGURATION_ITEMS, ARG_DUMP_CORE, ARG_CRASH_SHELL, ARG_CONFIRM_SPAWN, ARG_SHOW_STATUS, ARG_SYSV_CONSOLE, ARG_DESERIALIZE, 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' }, { "dump-configuration-items", no_argument, NULL, ARG_DUMP_CONFIGURATION_ITEMS }, { "dump-core", no_argument, NULL, ARG_DUMP_CORE }, { "crash-shell", no_argument, NULL, ARG_CRASH_SHELL }, { "confirm-spawn", no_argument, NULL, ARG_CONFIRM_SPAWN }, { "show-status", optional_argument, NULL, ARG_SHOW_STATUS }, #ifdef HAVE_SYSV_COMPAT { "sysv-console", optional_argument, NULL, ARG_SYSV_CONSOLE }, #endif { "deserialize", required_argument, NULL, ARG_DESERIALIZE }, { "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); while ((c = getopt_long(argc, argv, "hD", 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 = MANAGER_SYSTEM; break; case ARG_USER: arg_running_as = MANAGER_USER; break; case ARG_TEST: arg_action = ACTION_TEST; break; case ARG_DUMP_CONFIGURATION_ITEMS: arg_action = ACTION_DUMP_CONFIGURATION_ITEMS; break; case ARG_DUMP_CORE: arg_dump_core = true; break; case ARG_CRASH_SHELL: arg_crash_shell = true; break; case ARG_CONFIRM_SPAWN: arg_confirm_spawn = true; break; case ARG_SHOW_STATUS: if (optarg) { if ((r = parse_boolean(optarg)) < 0) { log_error("Failed to show status boolean %s.", optarg); return r; } arg_show_status = r; } else arg_show_status = true; break; #ifdef HAVE_SYSV_COMPAT case ARG_SYSV_CONSOLE: if (optarg) { if ((r = parse_boolean(optarg)) < 0) { log_error("Failed to SysV console boolean %s.", optarg); return r; } arg_sysv_console = r; } else arg_sysv_console = true; break; #endif case ARG_DESERIALIZE: { int fd; FILE *f; if ((r = safe_atoi(optarg, &fd)) < 0 || fd < 0) { log_error("Failed to parse deserialize option %s.", optarg); return r; } if (!(f = fdopen(fd, "r"))) { log_error("Failed to open serialization fd: %m"); return r; } if (serialization) fclose(serialization); serialization = f; 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 '?': return -EINVAL; default: log_error("Unknown option code %c", c); return -EINVAL; } /* PID 1 will get the kernel arguments as parameters, which we * ignore and unconditionally read from * /proc/cmdline. However, we need to ignore those arguments * here. */ if (arg_running_as != MANAGER_SYSTEM && optind < argc) { log_error("Excess arguments."); return -EINVAL; } 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 Dump core on crash\n" " --crash-shell Run shell on crash\n" " --confirm-spawn Ask for confirmation when spawning processes\n" " --show-status[=0|1] Show status updates on the console during bootup\n" #ifdef HAVE_SYSV_COMPAT " --sysv-console[=0|1] Connect output of SysV scripts to console\n" #endif " --log-target=TARGET Set log target (console, syslog, 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 prepare_reexecute(Manager *m, FILE **_f, FDSet **_fds) { FILE *f = NULL; FDSet *fds = NULL; int r; assert(m); assert(_f); assert(_fds); if ((r = manager_open_serialization(m, &f)) < 0) { log_error("Failed to create serialization file: %s", strerror(-r)); goto fail; } if (!(fds = fdset_new())) { r = -ENOMEM; log_error("Failed to allocate fd set: %s", strerror(-r)); goto fail; } if ((r = manager_serialize(m, f, fds)) < 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; } if ((r = fd_cloexec(fileno(f), false)) < 0) { log_error("Failed to disable O_CLOEXEC for serialization: %s", strerror(-r)); goto fail; } if ((r = fdset_cloexec(fds, false)) < 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 struct dual_timestamp* parse_initrd_timestamp(struct dual_timestamp *t) { const char *e; unsigned long long a, b; assert(t); if (!(e = getenv("RD_TIMESTAMP"))) 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) { struct stat a, b; bool seperate = false; /* Check that /usr is not a seperate fs */ if (lstat("/", &a) >= 0 && lstat("/usr", &b) >= 0) if (a.st_dev != b.st_dev) seperate = true; /* This check won't work usually during boot, since /usr is * probably not mounted yet, hence let's add a second * check. We just check whether /usr is an empty directory. */ if (dir_is_empty("/usr") > 0) seperate = true; if (!seperate) return; log_warning("/usr appears to be on a different file system than /. This is not supported anymore. " "Some things will probably break (sometimes even silently) in mysterious ways."); } int main(int argc, char *argv[]) { Manager *m = NULL; int r, retval = EXIT_FAILURE; FDSet *fds = NULL; bool reexecute = false; const char *shutdown_verb = NULL; dual_timestamp initrd_timestamp = { 0ULL, 0ULL }; char systemd[] = "systemd"; 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; } /* 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); log_show_color(isatty(STDERR_FILENO) > 0); log_show_location(false); log_set_max_level(LOG_INFO); if (getpid() == 1) { arg_running_as = MANAGER_SYSTEM; log_set_target(LOG_TARGET_SYSLOG_OR_KMSG); /* This might actually not return, but cause a * reexecution */ if (selinux_setup(argv) < 0) goto finish; if (label_init() < 0) goto finish; } else { arg_running_as = MANAGER_USER; log_set_target(LOG_TARGET_CONSOLE); } 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 (geteuid() == 0 && !getenv("SYSTEMD_SKIP_API_MOUNTS")) 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_signals(SIGNALS_IGNORE, -1); if (parse_config_file() < 0) goto finish; if (arg_running_as == MANAGER_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 Plymouth is being run make sure we show the status, so * that there's something nice to see when people press Esc */ if (access("/dev/.systemd/plymouth", F_OK) >= 0) arg_show_status = true; if (arg_action == ACTION_HELP) { retval = help(); 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); /* Remember open file descriptors for later deserialization */ if (serialization) { if ((r = fdset_new_fill(&fds)) < 0) { log_error("Failed to allocate fd set: %s", strerror(-r)); goto finish; } assert_se(fdset_remove(fds, fileno(serialization)) >= 0); } else close_all_fds(NULL, 0); /* Set up PATH unless it is already set */ setenv("PATH", "/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin", arg_running_as == MANAGER_SYSTEM); if (arg_running_as == MANAGER_SYSTEM) { /* Parse the data passed to us by the initrd and unset it */ parse_initrd_timestamp(&initrd_timestamp); filter_environ("RD_"); /* Unset some environment variables passed in from the * kernel that don't really make sense for us. */ unsetenv("HOME"); unsetenv("TERM"); } /* Move out of the way, so that we won't block unmounts */ assert_se(chdir("/") == 0); if (arg_running_as == MANAGER_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 == MANAGER_SYSTEM && arg_action == ACTION_RUN) { console_setup(getpid() == 1 && !serialization); make_null_stdio(); } /* 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(); log_full(arg_running_as == MANAGER_SYSTEM ? LOG_INFO : LOG_DEBUG, PACKAGE_STRING " running in %s mode. (" SYSTEMD_FEATURES "; " DISTRIBUTION ")", manager_running_as_to_string(arg_running_as)); if (arg_running_as == MANAGER_SYSTEM && !serialization) { locale_setup(); if (arg_show_status) status_welcome(); kmod_setup(); hostname_setup(); loopback_setup(); mkdir_p("/dev/.systemd/ask-password/", 0755); test_mtab(); test_usr(); } if ((r = manager_new(arg_running_as, &m)) < 0) { log_error("Failed to allocate manager object: %s", strerror(-r)); goto finish; } m->confirm_spawn = arg_confirm_spawn; m->show_status = arg_show_status; #ifdef HAVE_SYSV_COMPAT m->sysv_console = arg_sysv_console; #endif m->mount_auto = arg_mount_auto; m->swap_auto = arg_swap_auto; m->default_std_output = arg_default_std_output; m->default_std_error = arg_default_std_error; if (dual_timestamp_is_set(&initrd_timestamp)) m->initrd_timestamp = initrd_timestamp; if (arg_default_controllers) manager_set_default_controllers(m, arg_default_controllers); if ((r = manager_startup(m, serialization, fds)) < 0) log_error("Failed to fully start up daemon: %s", strerror(-r)); if (fds) { /* This will close all file descriptors that were opened, but * not claimed by any unit. */ fdset_free(fds); fds = NULL; } if (serialization) { fclose(serialization); serialization = NULL; } else { DBusError error; Unit *target = NULL; dbus_error_init(&error); log_debug("Activating default unit: %s", arg_default_unit); if ((r = manager_load_unit(m, arg_default_unit, NULL, &error, &target)) < 0) { log_error("Failed to load default target: %s", bus_error(&error, r)); dbus_error_free(&error); } else if (target->meta.load_state == UNIT_ERROR) log_error("Failed to load default target: %s", strerror(-target->meta.load_error)); else if (target->meta.load_state == UNIT_MASKED) log_error("Default target masked."); if (!target || target->meta.load_state != UNIT_LOADED) { log_info("Trying to load rescue target..."); if ((r = manager_load_unit(m, SPECIAL_RESCUE_TARGET, NULL, &error, &target)) < 0) { log_error("Failed to load rescue target: %s", bus_error(&error, r)); dbus_error_free(&error); goto finish; } else if (target->meta.load_state == UNIT_ERROR) { log_error("Failed to load rescue target: %s", strerror(-target->meta.load_error)); goto finish; } else if (target->meta.load_state == UNIT_MASKED) { log_error("Rescue target masked."); goto finish; } } assert(target->meta.load_state == UNIT_LOADED); if (arg_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, &error, NULL)) < 0) { log_error("Failed to start default target: %s", bus_error(&error, r)); dbus_error_free(&error); goto finish; } if (arg_action == ACTION_TEST) { printf("-> By jobs:\n"); manager_dump_jobs(m, stdout, "\t"); retval = EXIT_SUCCESS; goto finish; } } for (;;) { if ((r = manager_loop(m)) < 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."); if ((r = manager_reload(m)) < 0) log_error("Failed to reload: %s", strerror(-r)); break; case MANAGER_REEXECUTE: if (prepare_reexecute(m, &serialization, &fds) < 0) goto finish; reexecute = true; log_notice("Reexecuting."); 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]); log_notice("Shutting down."); goto finish; } default: assert_not_reached("Unknown exit code."); } } finish: if (m) manager_free(m); free(arg_default_unit); strv_free(arg_default_controllers); dbus_shutdown(); label_finish(); if (reexecute) { const char *args[15]; unsigned i = 0; char sfd[16]; assert(serialization); assert(fds); args[i++] = SYSTEMD_BINARY_PATH; args[i++] = "--log-level"; args[i++] = log_level_to_string(log_get_max_level()); args[i++] = "--log-target"; args[i++] = log_target_to_string(log_get_target()); if (arg_running_as == MANAGER_SYSTEM) args[i++] = "--system"; else args[i++] = "--user"; if (arg_dump_core) args[i++] = "--dump-core"; if (arg_crash_shell) args[i++] = "--crash-shell"; if (arg_confirm_spawn) args[i++] = "--confirm-spawn"; if (arg_show_status) args[i++] = "--show-status=1"; else args[i++] = "--show-status=0"; #ifdef HAVE_SYSV_COMPAT if (arg_sysv_console) args[i++] = "--sysv-console=1"; else args[i++] = "--sysv-console=0"; #endif snprintf(sfd, sizeof(sfd), "%i", fileno(serialization)); char_array_0(sfd); args[i++] = "--deserialize"; args[i++] = sfd; args[i++] = NULL; assert(i <= ELEMENTSOF(args)); execv(args[0], (char* const*) args); log_error("Failed to reexecute: %m"); } if (serialization) fclose(serialization); if (fds) fdset_free(fds); if (shutdown_verb) { const char * command_line[] = { SYSTEMD_SHUTDOWN_BINARY_PATH, shutdown_verb, NULL }; execv(SYSTEMD_SHUTDOWN_BINARY_PATH, (char **) command_line); log_error("Failed to execute shutdown binary, freezing: %m"); } if (getpid() == 1) freeze(); return retval; }