From e52a1d8a82cbe657525ec95b25dff3ce1c660079 Mon Sep 17 00:00:00 2001
From: md_5 <git@md-5.net>
Date: Sat, 12 Apr 2014 21:37:12 +1000
Subject: [PATCH] Update Warning


diff --git a/src/main/java/org/bukkit/craftbukkit/Main.java b/src/main/java/org/bukkit/craftbukkit/Main.java
index 008e037..1bc6d4a 100644
--- a/src/main/java/org/bukkit/craftbukkit/Main.java
+++ b/src/main/java/org/bukkit/craftbukkit/Main.java
@@ -1,7 +1,9 @@
 package org.bukkit.craftbukkit;
 
+import java.io.BufferedReader;
 import java.io.File;
 import java.io.IOException;
+import java.io.InputStreamReader;
 import java.text.SimpleDateFormat;
 import java.util.Arrays;
 import java.util.List;
@@ -15,7 +17,32 @@ public class Main {
     public static boolean useJline = true;
     public static boolean useConsole = true;
 
-    public static void main(String[] args) {
+    public static void main(String[] args) throws IOException {
+        // Spigot Start
+        File lock = new File( ".update-lock" );
+        if ( !lock.exists() && System.getProperty( "IReallyKnowWhatIAmDoingThisUpdate" ) == null )
+        {
+            BufferedReader br = new BufferedReader( new InputStreamReader( System.in ) );
+            String line;
+            System.err.println( "WARNING: This Minecraft update alters the way in which saved data is stored." );
+            System.err.println( "Please ensure your server is in the correct online/offline mode state, as the changes made are PERMANENT" );
+            System.err.println( "If you are running in offline mode, but your BungeeCord is in online mode, it is imperative that BungeeCord support is enabled in spigot.yml and BungeeCord's config.yml" );
+            System.err.println( "By typing `yes` you acknowledge that you have taken the necessary backups and are aware of this conversion" );
+            System.err.println( "Please type yes to continue starting the server. You have been warned :)" );
+            System.err.println( "See http://www.spigotmc.org/wiki/uuid-conversion/ if you have any questions and remember BACKUP BACKUP BACKUP" );
+            while ( ( line = br.readLine() ) != null )
+            {
+                if ( "yes".equals( line ) )
+                {
+                    lock.createNewFile();
+                    break;
+                } else
+                {
+                    System.err.println( "Please type `yes` (without the quotes) to continue" );
+                }
+            }
+        }
+        // Spigot End
         // Todo: Installation script
         OptionParser parser = new OptionParser() {
             {
-- 
1.8.3.2