tree-wide: drop 'This file is part of systemd' blurb

[thirdparty/systemd.git] / src / user-sessions / user-sessions.c

diff --git a/src/user-sessions/user-sessions.c b/src/user-sessions/user-sessions.c
index e80a7771de6ae63d24bf65cc71aceedd08d8a935..2b6998c61cb06c686581bfa7a5f81223b5c7db89 100644 (file)
--- a/src/user-sessions/user-sessions.c
+++ b/src/user-sessions/user-sessions.c
@@ -1,32 +1,21 @@
-/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
-
+/* 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 <unistd.h>
 #include <errno.h>
+#include <unistd.h>
 
+#include "fileio.h"
+#include "fileio-label.h"
+#include "fs-util.h"
 #include "log.h"
+#include "selinux-util.h"
+#include "string-util.h"
 #include "util.h"
-#include "fileio.h"
 
 int main(int argc, char*argv[]) {
+        int r, k;
 
         if (argc != 2) {
                 log_error("This program requires one argument.");
@@ -39,42 +28,21 @@ int main(int argc, char*argv[]) {
 
         umask(0022);
 
-        if (streq(argv[1], "start")) {
-                int r = 0;
-
-                if (unlink("/run/nologin") < 0 && errno != ENOENT) {
-                        log_error_errno(errno, "Failed to remove /run/nologin file: %m");
-                        r = -errno;
-                }
-
-                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;
+        mac_selinux_init();
 
-        } else if (streq(argv[1], "stop")) {
-                int r;
-
-                r = write_string_file("/run/nologin", "System is going down.", WRITE_STRING_FILE_CREATE|WRITE_STRING_FILE_ATOMIC);
-                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;
+        if (streq(argv[1], "start")) {
+                r = unlink_or_warn("/run/nologin");
+                k = unlink_or_warn("/etc/nologin");
+                if (k < 0 && r >= 0)
+                        r = k;
+
+        } else if (streq(argv[1], "stop"))
+                r = create_shutdown_run_nologin_or_warn();
+        else {
+                log_error("Unknown verb '%s'.", argv[1]);
+                r = -EINVAL;
         }
 
-        return EXIT_SUCCESS;
+        mac_selinux_finish();
+        return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS;
 }