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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 15:35:18 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 15:35:18 +0000 |
commit | b750101eb236130cf056c675997decbac904cc49 (patch) | |
tree | a5df1a06754bdd014cb975c051c83b01c9a97532 /src/sulogin-shell/sulogin-shell.c | |
parent | Initial commit. (diff) | |
download | systemd-upstream.tar.xz systemd-upstream.zip |
Adding upstream version 252.22.upstream/252.22upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to '')
-rw-r--r-- | src/sulogin-shell/sulogin-shell.c | 119 |
1 files changed, 119 insertions, 0 deletions
diff --git a/src/sulogin-shell/sulogin-shell.c b/src/sulogin-shell/sulogin-shell.c new file mode 100644 index 0000000..5648dfd --- /dev/null +++ b/src/sulogin-shell/sulogin-shell.c @@ -0,0 +1,119 @@ +/* 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; +} |