X-Git-Url: https://www.chiark.greenend.org.uk/ucgi/~ianmdlvl/git?p=elogind.git;a=blobdiff_plain;f=src%2Fmain.c;h=25b6e87de395a53257ee50cf37c7c6b4ca0bb5ca;hp=88ba09d43e51a1355d3cbe00620e7bc22ae19dd1;hb=9d76d730ef2f59425c4c75cb55245c3b7777a445;hpb=b9080b03a98252ccccb332d0c892403b8b841916 diff --git a/src/main.c b/src/main.c index 88ba09d43..25b6e87de 100644 --- a/src/main.c +++ b/src/main.c @@ -31,6 +31,7 @@ #include #include #include +#include #include "manager.h" #include "log.h" @@ -39,6 +40,8 @@ #include "loopback-setup.h" #include "kmod-setup.h" #include "locale-setup.h" +#include "selinux-setup.h" +#include "machine-id-setup.h" #include "load-fragment.h" #include "fdset.h" #include "special.h" @@ -47,6 +50,8 @@ #include "missing.h" #include "label.h" #include "build.h" +#include "strv.h" +#include "def.h" static enum { ACTION_RUN, @@ -69,7 +74,9 @@ static bool arg_sysv_console = true; #endif static bool arg_mount_auto = true; static bool arg_swap_auto = true; -static char *arg_console = NULL; +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; @@ -162,7 +169,7 @@ _noreturn_ static void crash(int sig) { _exit(1); } - log_info("Successfully spawned crash shall as pid %lu.", (unsigned long) pid); + log_info("Successfully spawned crash shell as pid %lu.", (unsigned long) pid); } log_info("Freezing execution."); @@ -180,20 +187,6 @@ static void install_crash_handler(void) { sigaction_many(&sa, SIGNALS_CRASH_HANDLER, -1); } -static int make_null_stdio(void) { - int null_fd, r; - - if ((null_fd = open("/dev/null", O_RDWR|O_NOCTTY)) < 0) { - log_error("Failed to open /dev/null: %m"); - return -errno; - } - - if ((r = make_stdio(null_fd)) < 0) - log_warning("Failed to dup2() device: %s", strerror(-r)); - - return r; -} - static int console_setup(bool do_reset) { int tty_fd, r; @@ -210,7 +203,7 @@ static int console_setup(bool do_reset) { return -tty_fd; } - if ((r = reset_terminal(tty_fd)) < 0) + if ((r = reset_terminal_fd(tty_fd)) < 0) log_error("Failed to reset /dev/console: %s", strerror(-r)); close_nointr_nofail(tty_fd); @@ -234,6 +227,7 @@ 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, @@ -309,6 +303,20 @@ static int parse_proc_cmdline_word(const char *word) { 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; @@ -333,31 +341,15 @@ static int parse_proc_cmdline_word(const char *word) { #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-org-kmsg|null\n" + "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"); - - } else if (startswith(word, "console=")) { - const char *k; - size_t l; - char *w = NULL; - - k = word + 8; - l = strcspn(k, ","); - - /* Ignore the console setting if set to a VT */ - if (l < 4 || - !startswith(k, "tty") || - k[3+strspn(k+3, "0123456789")] != 0) { - - if (!(w = strndup(k, l))) - return -ENOMEM; - } - - free(arg_console); - arg_console = w; + "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; @@ -381,6 +373,7 @@ static int config_parse_level( unsigned line, const char *section, const char *lvalue, + int ltype, const char *rvalue, void *data, void *userdata) { @@ -398,6 +391,7 @@ static int config_parse_target( unsigned line, const char *section, const char *lvalue, + int ltype, const char *rvalue, void *data, void *userdata) { @@ -415,6 +409,7 @@ static int config_parse_color( unsigned line, const char *section, const char *lvalue, + int ltype, const char *rvalue, void *data, void *userdata) { @@ -432,6 +427,7 @@ static int config_parse_location( unsigned line, const char *section, const char *lvalue, + int ltype, const char *rvalue, void *data, void *userdata) { @@ -449,6 +445,7 @@ static int config_parse_cpu_affinity( unsigned line, const char *section, const char *lvalue, + int ltype, const char *rvalue, void *data, void *userdata) { @@ -497,24 +494,29 @@ static int config_parse_cpu_affinity( 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" }, + { "LogLevel", config_parse_level, 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" }, #ifdef HAVE_SYSV_COMPAT - { "SysVConsole", config_parse_bool, &arg_sysv_console, "Manager" }, + { "SysVConsole", config_parse_bool, 0, &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" }, - { NULL, NULL, NULL, NULL } + { "CrashChVT", config_parse_int, 0, &arg_crash_chvt, "Manager" }, + { "CPUAffinity", config_parse_cpu_affinity, 0, NULL, "Manager" }, + { "MountAuto", config_parse_bool, 0, &arg_mount_auto, "Manager" }, + { "SwapAuto", config_parse_bool, 0, &arg_swap_auto, "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" }, + { NULL, NULL, 0, NULL, NULL } }; static const char * const sections[] = { @@ -526,7 +528,7 @@ static int parse_config_file(void) { const char *fn; int r; - fn = arg_running_as == MANAGER_SYSTEM ? SYSTEM_CONFIG_FILE : SESSION_CONFIG_FILE; + fn = arg_running_as == MANAGER_SYSTEM ? SYSTEM_CONFIG_FILE : USER_CONFIG_FILE; if (!(f = fopen(fn, "re"))) { if (errno == ENOENT) @@ -549,6 +551,11 @@ static int parse_proc_cmdline(void) { 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; @@ -585,7 +592,7 @@ static int parse_argv(int argc, char *argv[]) { ARG_LOG_LOCATION, ARG_UNIT, ARG_SYSTEM, - ARG_SESSION, + ARG_USER, ARG_TEST, ARG_DUMP_CONFIGURATION_ITEMS, ARG_DUMP_CORE, @@ -594,7 +601,9 @@ static int parse_argv(int argc, char *argv[]) { ARG_SHOW_STATUS, ARG_SYSV_CONSOLE, ARG_DESERIALIZE, - ARG_INTROSPECT + ARG_INTROSPECT, + ARG_DEFAULT_STD_OUTPUT, + ARG_DEFAULT_STD_ERROR }; static const struct option options[] = { @@ -604,7 +613,7 @@ static int parse_argv(int argc, char *argv[]) { { "log-location", optional_argument, NULL, ARG_LOG_LOCATION }, { "unit", required_argument, NULL, ARG_UNIT }, { "system", no_argument, NULL, ARG_SYSTEM }, - { "session", no_argument, NULL, ARG_SESSION }, + { "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 }, @@ -617,6 +626,8 @@ static int parse_argv(int argc, char *argv[]) { #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 } }; @@ -625,7 +636,10 @@ static int parse_argv(int argc, char *argv[]) { assert(argc >= 1); assert(argv); - while ((c = getopt_long(argc, argv, "hD", options, NULL)) >= 0) + if (getpid() == 1) + opterr = 0; + + while ((c = getopt_long(argc, argv, "hDbsz:", options, NULL)) >= 0) switch (c) { @@ -670,6 +684,24 @@ static int parse_argv(int argc, char *argv[]) { 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) { @@ -683,8 +715,8 @@ static int parse_argv(int argc, char *argv[]) { arg_running_as = MANAGER_SYSTEM; break; - case ARG_SESSION: - arg_running_as = MANAGER_SESSION; + case ARG_USER: + arg_running_as = MANAGER_USER; break; case ARG_TEST: @@ -783,37 +815,62 @@ static int parse_argv(int argc, char *argv[]) { log_set_max_level(LOG_DEBUG); break; - case '?': - return -EINVAL; + 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: - log_error("Unknown option code %c", c); - return -EINVAL; + if (getpid() != 1) { + log_error("Unknown option code %c", c); + return -EINVAL; + } + + break; } - /* 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) { + 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) + return r; + } + return 0; } static int help(void) { printf("%s [OPTIONS...]\n\n" - "Starts up and maintains the system or a session.\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" - " --session Run a session instance\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" @@ -824,7 +881,9 @@ static int help(void) { " --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", + " --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; @@ -839,8 +898,11 @@ static int prepare_reexecute(Manager *m, FILE **_f, FDSet **_fds) { assert(_f); assert(_fds); + /* Make sure nothing is really destructed when we shut down */ + m->n_reloading ++; + if ((r = manager_open_serialization(m, &f)) < 0) { - log_error("Failed to create serialization faile: %s", strerror(-r)); + log_error("Failed to create serialization file: %s", strerror(-r)); goto fail; } @@ -884,15 +946,83 @@ fail: 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) { + + /* 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." ); + + sleep(10); +} + 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 }; + char systemd[] = "systemd"; if (getpid() != 1 && strstr(program_invocation_short_name, "init")) { - /* This is compatbility support for SysV, where + /* This is compatibility support for SysV, where * calling init as a user is identical to telinit. */ errno = -ENOENT; @@ -901,19 +1031,47 @@ int main(int argc, char *argv[]) { 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); + saved_argv = argv; + saved_argc = argc; + 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); + log_set_target(detect_container(NULL) > 0 ? LOG_TARGET_CONSOLE : LOG_TARGET_SYSLOG_OR_KMSG); + log_open(); + + /* This might actually not return, but cause a + * reexecution */ + if (selinux_setup(argv) < 0) + goto finish; if (label_init() < 0) goto finish; + + if (hwclock_is_localtime() > 0) { + int err, min; + + err = hwclock_apply_localtime_delta(&min); + if (err < 0) + log_error("Failed to apply local time delta: %s", strerror(-err)); + else + log_info("RTC configured in localtime, applying delta of %i minutes to system time.", min); + } + } else { - arg_running_as = MANAGER_SESSION; - log_set_target(LOG_TARGET_CONSOLE); + arg_running_as = MANAGER_USER; + log_set_target(LOG_TARGET_AUTO); + log_open(); } if (set_default_unit(SPECIAL_DEFAULT_TARGET) < 0) @@ -943,6 +1101,18 @@ int main(int argc, char *argv[]) { 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 == MANAGER_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; @@ -957,6 +1127,9 @@ int main(int argc, char *argv[]) { 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 */ if (serialization) { if ((r = fdset_new_fill(&fds)) < 0) { @@ -973,6 +1146,20 @@ int main(int argc, char *argv[]) { "/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"); + + /* 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); @@ -1008,14 +1195,17 @@ int main(int argc, char *argv[]) { if (arg_running_as == MANAGER_SYSTEM && !serialization) { locale_setup(); - if (arg_show_status) + if (arg_show_status || plymouth_running()) status_welcome(); kmod_setup(); hostname_setup(); + machine_id_setup(); loopback_setup(); - mkdir_p("/dev/.systemd/ask-password/", 0755); + test_mtab(); + test_usr(); + test_cgroups(); } if ((r = manager_new(arg_running_as, &m)) < 0) { @@ -1030,9 +1220,16 @@ int main(int argc, char *argv[]) { #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 (arg_console) - manager_set_console(m, arg_console); + if (dual_timestamp_is_set(&initrd_timestamp)) + m->initrd_timestamp = initrd_timestamp; + + if (arg_default_controllers) + manager_set_default_controllers(m, arg_default_controllers); + + before_startup = now(CLOCK_MONOTONIC); if ((r = manager_startup(m, serialization, fds)) < 0) log_error("Failed to fully start up daemon: %s", strerror(-r)); @@ -1101,6 +1298,10 @@ int main(int argc, char *argv[]) { } } + after_startup = now(CLOCK_MONOTONIC); + log_debug("Loaded units and determined initial transaction in %s.", + format_timespan(timespan, sizeof(timespan), after_startup - before_startup)); + for (;;) { if ((r = manager_loop(m)) < 0) { log_error("Failed to run mainloop: %s", strerror(-r)); @@ -1155,7 +1356,7 @@ finish: manager_free(m); free(arg_default_unit); - free(arg_console); + strv_free(arg_default_controllers); dbus_shutdown(); @@ -1180,7 +1381,7 @@ finish: if (arg_running_as == MANAGER_SYSTEM) args[i++] = "--system"; else - args[i++] = "--session"; + args[i++] = "--user"; if (arg_dump_core) args[i++] = "--dump-core";