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/* SPDX-License-Identifier: LGPL-2.1+ */
/***
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 Lesser General Public License as published by
the Free Software Foundation; either version 2.1 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with systemd; If not, see <http://www.gnu.org/licenses/>.
***/
#include <errno.h>
#include <unistd.h>
#include "fileio.h"
#include "fileio-label.h"
#include "log.h"
#include "selinux-util.h"
#include "string-util.h"
#include "util.h"
int main(int argc, char*argv[]) {
if (argc != 2) {
log_error("This program requires one argument.");
return EXIT_FAILURE;
}
log_set_target(LOG_TARGET_AUTO);
log_parse_environment();
log_open();
umask(0022);
mac_selinux_init();
if (streq(argv[1], "start")) {
int r = 0;
if (unlink("/run/nologin") < 0 && errno != ENOENT)
r = log_error_errno(errno,
"Failed to remove /run/nologin file: %m");
if (unlink("/etc/nologin") < 0 && errno != ENOENT) {
/* If the file doesn't exist and /etc simply
* was read-only (in which case unlink()
* returns EROFS even if the file doesn't
* exist), don't complain */
if (errno != EROFS || access("/etc/nologin", F_OK) >= 0) {
log_error_errno(errno, "Failed to remove /etc/nologin file: %m");
return EXIT_FAILURE;
}
}
if (r < 0)
return EXIT_FAILURE;
} else if (streq(argv[1], "stop")) {
int r;
r = write_string_file_atomic_label("/run/nologin", "System is going down.");
if (r < 0) {
log_error_errno(r, "Failed to create /run/nologin: %m");
return EXIT_FAILURE;
}
} else {
log_error("Unknown verb %s.", argv[1]);
return EXIT_FAILURE;
}
mac_selinux_finish();
return EXIT_SUCCESS;
}
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