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/* SPDX-License-Identifier: LGPL-2.1-or-later */
/***
Copyright © 2017 Felipe Sateler
***/
#include <errno.h>
#include <sys/prctl.h>
#include "sd-bus.h"
#include "bus-locator.h"
#include "bus-util.h"
#include "bus-error.h"
#include "def.h"
#include "env-util.h"
#include "log.h"
#include "process-util.h"
#include "signal-util.h"
#include "special.h"
static int reload_manager(sd_bus *bus) {
_cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL;
_cleanup_(sd_bus_message_unrefp) sd_bus_message *m = NULL;
int r;
log_info("Reloading system manager configuration");
r = bus_message_new_method_call(
bus,
&m,
bus_systemd_mgr,
"Reload");
if (r < 0)
return bus_log_create_error(r);
/* Reloading the daemon may take long, hence set a longer timeout here */
r = sd_bus_call(bus, m, DAEMON_RELOAD_TIMEOUT_SEC, &error, NULL);
if (r < 0)
return log_error_errno(r, "Failed to reload daemon: %s", bus_error_message(&error, r));
return 0;
}
static int start_default_target(sd_bus *bus) {
_cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL;
int r;
log_info("Starting "SPECIAL_DEFAULT_TARGET);
/* Start this unit only if we can replace basic.target with it */
r = bus_call_method(
bus,
bus_systemd_mgr,
"StartUnit",
&error,
NULL,
"ss", SPECIAL_DEFAULT_TARGET, "isolate");
if (r < 0)
return log_error_errno(r, "Failed to start "SPECIAL_DEFAULT_TARGET": %s", bus_error_message(&error, r));
return 0;
}
static int fork_wait(const char* const cmdline[]) {
pid_t pid;
int r;
r = safe_fork("(sulogin)", FORK_RESET_SIGNALS|FORK_DEATHSIG|FORK_RLIMIT_NOFILE_SAFE|FORK_LOG, &pid);
if (r < 0)
return r;
if (r == 0) {
/* Child */
execv(cmdline[0], (char**) cmdline);
log_error_errno(errno, "Failed to execute %s: %m", cmdline[0]);
_exit(EXIT_FAILURE); /* Operational error */
}
return wait_for_terminate_and_check(cmdline[0], pid, WAIT_LOG_ABNORMAL);
}
static void print_mode(const char* mode) {
printf("You are in %s mode. After logging in, type \"journalctl -xb\" to view\n"
"system logs, \"systemctl reboot\" to reboot, \"systemctl default\" or \"exit\"\n"
"to boot into default mode.\n", mode);
fflush(stdout);
}
int main(int argc, char *argv[]) {
const char* sulogin_cmdline[] = {
SULOGIN,
NULL, /* --force */
NULL
};
_cleanup_(sd_bus_flush_close_unrefp) sd_bus *bus = NULL;
int r;
log_setup();
print_mode(argc > 1 ? argv[1] : "");
if (getenv_bool("SYSTEMD_SULOGIN_FORCE") > 0)
/* allows passwordless logins if root account is locked. */
sulogin_cmdline[1] = "--force";
(void) fork_wait(sulogin_cmdline);
r = bus_connect_system_systemd(&bus);
if (r < 0) {
log_warning_errno(r, "Failed to get D-Bus connection: %m");
r = 0;
} else {
(void) reload_manager(bus);
r = start_default_target(bus);
}
return r >= 0 ? EXIT_SUCCESS : EXIT_FAILURE;
}
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