From 30189186e9ac5925ac62e82df4fc47b3ed9b6228 Mon Sep 17 00:00:00 2001
From: Beckett Normington <beckett@b0ba.dev>
Date: Sat, 29 Oct 2022 20:13:30 -0400
Subject: [PATCH] Utilities: Add nologin application

This adds the `nologin` application to the system. This application
will look for `/etc/nologin`. If it is present, it will display the
message in the file. Otherwise, it will display an error about the
current account being unavailable.
---
 Userland/Utilities/CMakeLists.txt |  1 +
 Userland/Utilities/nologin.cpp    | 24 ++++++++++++++++++++++++
 2 files changed, 25 insertions(+)
 create mode 100644 Userland/Utilities/nologin.cpp

diff --git a/Userland/Utilities/CMakeLists.txt b/Userland/Utilities/CMakeLists.txt
index 634f4832e8b..6f04ebb49df 100644
--- a/Userland/Utilities/CMakeLists.txt
+++ b/Userland/Utilities/CMakeLists.txt
@@ -165,6 +165,7 @@ target_link_libraries(mount LibMain)
 target_link_libraries(nc LibMain)
 target_link_libraries(netstat LibMain)
 target_link_libraries(nl LibMain)
+target_link_libraries(nologin LibMain)
 target_link_libraries(notify LibGUI LibMain)
 target_link_libraries(nproc LibMain)
 target_link_libraries(ntpquery LibMain)
diff --git a/Userland/Utilities/nologin.cpp b/Userland/Utilities/nologin.cpp
new file mode 100644
index 00000000000..9e58726712b
--- /dev/null
+++ b/Userland/Utilities/nologin.cpp
@@ -0,0 +1,24 @@
+/*
+ * Copyright (c) 2022, Beckett Normington <beckett@b0ba.dev>
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#include <LibCore/Stream.h>
+#include <LibCore/System.h>
+#include <LibMain/Main.h>
+
+ErrorOr<int> serenity_main(Main::Arguments)
+{
+    TRY(Core::System::pledge("stdio rpath"sv));
+
+    auto file_or_error = Core::Stream::File::open("/etc/nologin"sv, Core::Stream::OpenMode::Read);
+    if (file_or_error.is_error()) {
+        outln("This account is currently not available."sv);
+    } else {
+        auto message_from_file = TRY(file_or_error.value()->read_all());
+        out(message_from_file);
+    }
+
+    return 1;
+}