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2b583ce657
systemd/src/main.c
Kay Sievers 2b583ce657 use /run instead of /dev/.run 
Instead of the /dev/.run trick we have currently implemented, we decided
to move the early-boot runtime dir to /run.

An existing /var/run directory is bind-mounted to /run. If /var/run is
already a symlink, no action is taken.

An existing /var/lock directory is bind-mounted to /run/lock.
If /var/lock is already a symlink, no action is taken.

To implement the directory vs. symlink logic, we have a:
  ConditionPathIsDirectory=
now, which is used in the mount units.

Skipped mount unit in case of symlink:
  $ systemctl status var-run.mount
  var-run.mount - Runtime Directory
    Loaded: loaded (/lib/systemd/system/var-run.mount)
    Active: inactive (dead)
            start condition failed at Fri, 25 Mar 2011 04:51:41 +0100; 6min ago
     Where: /var/run
      What: /run
    CGroup: name=systemd:/system/var-run.mount

The systemd rpm needs to make sure to add something like:
  %pre
  mkdir -p -m0755 /run >/dev/null 2>&1 || :
or it needs to be added to filesystem.rpm.

Udev -git already uses /run if that exists, and is writable at bootup.
Otherwise it falls back to the current /dev/.udev.

Dracut and plymouth need to be adopted to switch from /dev/.run to run
too.

Cheers,
Kay
2011-03-28 23:00:00 +02:00

1398 lines
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/*-*- 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 "machine-id-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"
#include "def.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,
"-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="))
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, 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, 0, &arg_sysv_console, "Manager" },
#endif
{ "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[] = {
"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;
/* 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);
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);
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 = 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 '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)
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 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) {
/* Check that /usr is not a separate fs */
if (dir_is_empty("/usr") > 0)
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. "
"Consult http://freedesktop.org/wiki/Software/systemd/separate-usr-is-broken for more information.");
}
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(detect_container(NULL) > 0 ? LOG_TARGET_CONSOLE : 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 (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 Plymouth is being run make sure we show the status, so
* that there's something nice to see when people press Esc */
if (access("/run/initramfs/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");
/* 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 == 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();
machine_id_setup();
loopback_setup();
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;
}
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