106 lines
3.3 KiB
C
106 lines
3.3 KiB
C
/***
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This file is part of systemd.
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Copyright 2017 Felipe Sateler
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systemd is free software; you can redistribute it and/or modify it
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under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 2.1 of the License, or
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(at your option) any later version.
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systemd is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with systemd; If not, see <http://www.gnu.org/licenses/>.
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***/
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#include <errno.h>
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#include <sys/prctl.h>
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#include "bus-util.h"
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#include "bus-error.h"
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#include "log.h"
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#include "process-util.h"
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#include "sd-bus.h"
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#include "signal-util.h"
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static int start_default_target(void) {
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_cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL;
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_cleanup_(sd_bus_flush_close_unrefp) sd_bus *bus = NULL;
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int r;
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r = bus_connect_system_systemd(&bus);
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if (r < 0) {
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log_error_errno(r, "Failed to get D-Bus connection: %m");
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return false;
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}
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log_info("Starting default target");
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/* Start these units only if we can replace base.target with it */
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r = sd_bus_call_method(bus,
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"org.freedesktop.systemd1",
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"/org/freedesktop/systemd1",
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"org.freedesktop.systemd1.Manager",
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"StartUnit",
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&error,
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NULL,
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"ss", "default.target", "isolate");
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if (r < 0)
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log_error("Failed to start default target: %s", bus_error_message(&error, r));
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return r;
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}
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static void fork_wait(const char* const cmdline[]) {
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pid_t pid;
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pid = fork();
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if (pid < 0) {
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log_error_errno(errno, "fork(): %m");
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return;
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}
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if (pid == 0) {
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/* Child */
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(void) reset_all_signal_handlers();
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(void) reset_signal_mask();
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assert_se(prctl(PR_SET_PDEATHSIG, SIGTERM) == 0);
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execv(cmdline[0], (char**) cmdline);
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log_error_errno(errno, "Failed to execute %s: %m", cmdline[0]);
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_exit(EXIT_FAILURE); /* Operational error */
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}
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wait_for_terminate_and_warn(cmdline[0], pid, false);
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}
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static void print_mode(const char* mode) {
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printf("You are in %s mode. After logging in, type \"journalctl -xb\" to view\n"
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"system logs, \"systemctl reboot\" to reboot, \"systemctl default\" or ^D to boot\n"
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"into default mode.\n", mode);
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fflush(stdout);
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}
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int main(int argc, char *argv[]) {
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static const char* const sulogin_cmdline[] = {SULOGIN, NULL};
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int r;
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log_set_target(LOG_TARGET_AUTO);
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log_parse_environment();
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log_open();
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print_mode(argc > 1 ? argv[1] : "");
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fork_wait(sulogin_cmdline);
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r = start_default_target();
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return r >= 0 ? EXIT_SUCCESS : EXIT_FAILURE;
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}
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