Add CommandLine EULA Flag

This flag contains the same message as eula.txt (albeit with proper grammar for 3rd person plural). By setting this flag you are agreeing to the terms listed in the message printed upon setting this flag, which are no different from those agreed to by any other method.

This feature only exists for hosting companies and people who manage servers in bulk who wish to agree to the terms by setting a flag in a script.

By: md_5 <git@md-5.net>

paper-server/patches/sources/net/minecraft/server/Main.java.patch

@@ -71,7 +71,7 @@
                  JvmProfiler.INSTANCE.start(Environment.SERVER);
              }
  
-@@ -112,14 +125,27 @@
+@@ -112,28 +125,52 @@
              Bootstrap.validate();
              Util.startTimerHackThread();
              Path path1 = Paths.get("server.properties");
@@ -101,7 +101,19 @@
                  Main.LOGGER.info("Initialized '{}' and '{}'", path1.toAbsolutePath(), path2.toAbsolutePath());
                  return;
              }
-@@ -129,11 +155,13 @@
+ 
+-            if (!eula.hasAgreedToEULA()) {
++            // Spigot Start
++            boolean eulaAgreed = Boolean.getBoolean( "com.mojang.eula.agree" );
++            if ( eulaAgreed )
++            {
++                System.err.println( "You have used the Spigot command line EULA agreement flag." );
++                System.err.println( "By using this setting you are indicating your agreement to Mojang's EULA (https://account.mojang.com/documents/minecraft_eula)." );
++                System.err.println( "If you do not agree to the above EULA please stop your server and remove this flag immediately." );
++            }
++            // Spigot End
++            if (!eula.hasAgreedToEULA() && !eulaAgreed) { // Spigot
+                 Main.LOGGER.info("You need to agree to the EULA in order to run the server. Go to eula.txt for more info.");
                  return;
              }
  
@@ -118,7 +130,7 @@
              Dynamic dynamic;
  
              if (convertable_conversionsession.hasWorldData()) {
-@@ -174,13 +202,31 @@
+@@ -174,13 +211,31 @@
              }
  
              Dynamic<?> dynamic1 = dynamic;
@@ -151,7 +163,7 @@
  
              WorldStem worldstem;
  
-@@ -189,6 +235,7 @@
+@@ -189,6 +244,7 @@
  
                  worldstem = (WorldStem) Util.blockUntilDone((executor) -> {
                      return WorldLoader.load(worldloader_c, (worldloader_a) -> {
@@ -159,7 +171,7 @@
                          Registry<LevelStem> iregistry = worldloader_a.datapackDimensions().lookupOrThrow(Registries.LEVEL_STEM);
  
                          if (dynamic1 != null) {
-@@ -201,7 +248,7 @@
+@@ -201,7 +257,7 @@
                              WorldOptions worldoptions;
                              WorldDimensions worlddimensions;
  
@@ -168,7 +180,7 @@
                                  worldsettings = MinecraftServer.DEMO_SETTINGS;
                                  worldoptions = WorldOptions.DEMO_OPTIONS;
                                  worlddimensions = WorldPresets.createNormalWorldDimensions(worldloader_a.datapackWorldgen());
-@@ -209,7 +256,7 @@
+@@ -209,7 +265,7 @@
                                  DedicatedServerProperties dedicatedserverproperties = dedicatedserversettings.getProperties();
  
                                  worldsettings = new LevelSettings(dedicatedserverproperties.levelName, dedicatedserverproperties.gamemode, dedicatedserverproperties.hardcore, dedicatedserverproperties.difficulty, false, new GameRules(worldloader_a.dataConfiguration().enabledFeatures()), worldloader_a.dataConfiguration());
@@ -177,7 +189,7 @@
                                  worlddimensions = dedicatedserverproperties.createDimensions(worldloader_a.datapackWorldgen());
                              }
  
-@@ -225,32 +272,44 @@
+@@ -225,32 +281,44 @@
                  return;
              }
  
@@ -227,7 +239,7 @@
              Thread thread = new Thread("Server Shutdown Thread") {
                  public void run() {
                      dedicatedserver.halt(true);
-@@ -259,6 +318,7 @@
+@@ -259,6 +327,7 @@
  
              thread.setUncaughtExceptionHandler(new DefaultUncaughtExceptionHandler(Main.LOGGER));
              Runtime.getRuntime().addShutdownHook(thread);
@@ -235,7 +247,7 @@
          } catch (Exception exception1) {
              Main.LOGGER.error(LogUtils.FATAL_MARKER, "Failed to start the minecraft server", exception1);
          }
-@@ -295,7 +355,7 @@
+@@ -295,7 +364,7 @@
      }
  
      public static void forceUpgrade(LevelStorageSource.LevelStorageAccess session, DataFixer dataFixer, boolean eraseCache, BooleanSupplier continueCheck, RegistryAccess dynamicRegistryManager, boolean recreateRegionFiles) {