1 /* SPDX-License-Identifier: LGPL-2.1-or-later */
2
3 #include <sys/stat.h>
4
5 #include "fileio-label.h"
6 #include "fileio.h"
7 #include "selinux-util.h"
8
write_string_file_atomic_label_ts(const char * fn,const char * line,struct timespec * ts)9 int write_string_file_atomic_label_ts(const char *fn, const char *line, struct timespec *ts) {
10 int r;
11
12 r = mac_selinux_create_file_prepare(fn, S_IFREG);
13 if (r < 0)
14 return r;
15
16 r = write_string_file_ts(fn, line, WRITE_STRING_FILE_CREATE|WRITE_STRING_FILE_ATOMIC, ts);
17
18 mac_selinux_create_file_clear();
19
20 return r;
21 }
22
create_shutdown_run_nologin_or_warn(void)23 int create_shutdown_run_nologin_or_warn(void) {
24 int r;
25
26 /* This is used twice: once in systemd-user-sessions.service, in order to block logins when we actually go
27 * down, and once in systemd-logind.service when shutdowns are scheduled, and logins are to be turned off a bit
28 * in advance. We use the same wording of the message in both cases. */
29
30 r = write_string_file_atomic_label("/run/nologin",
31 "System is going down. Unprivileged users are not permitted to log in anymore. "
32 "For technical details, see pam_nologin(8).");
33 if (r < 0)
34 return log_error_errno(r, "Failed to create /run/nologin: %m");
35
36 return 0;
37 }
38