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Do not let the server load chunks from newer versions (1.16.2+)
If the server attempts to load a chunk generated by a newer version of the game, immediately stop the server to prevent data corruption. You can override this functionality at your own peril.
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@ -0,0 +1,39 @@
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From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
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From: Zach Brown <zach@zachbr.io>
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Date: Tue, 23 Jul 2019 20:44:47 -0500
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Subject: [PATCH] Do not let the server load chunks from newer versions
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If the server attempts to load a chunk generated by a newer version of
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the game, immediately stop the server to prevent data corruption.
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You can override this functionality at your own peril.
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diff --git a/src/main/java/net/minecraft/server/ChunkRegionLoader.java b/src/main/java/net/minecraft/server/ChunkRegionLoader.java
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index ac58fcb7985ebe0cfdab6e1400deb37c233ff637..66a39d75394236f5ee745da7ac0b0ac5fe71f911 100644
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--- a/src/main/java/net/minecraft/server/ChunkRegionLoader.java
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+++ b/src/main/java/net/minecraft/server/ChunkRegionLoader.java
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@@ -51,10 +51,24 @@ public class ChunkRegionLoader {
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return holder.protoChunk;
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}
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+ // Paper start
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+ private static final int CURRENT_DATA_VERSION = SharedConstants.getGameVersion().getWorldVersion();
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+ private static final boolean JUST_CORRUPT_IT = Boolean.getBoolean("Paper.ignoreWorldDataVersion");
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+ // Paper end
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+
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public static InProgressChunkHolder loadChunk(WorldServer worldserver, DefinedStructureManager definedstructuremanager, VillagePlace villageplace, ChunkCoordIntPair chunkcoordintpair, NBTTagCompound nbttagcompound, boolean distinguish) {
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ArrayDeque<Runnable> tasksToExecuteOnMain = new ArrayDeque<>();
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// Paper end
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ChunkGenerator chunkgenerator = worldserver.getChunkProvider().getChunkGenerator();
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+ // Paper start - Do NOT attempt to load chunks saved with newer versions
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+ if (nbttagcompound.hasKeyOfType("DataVersion", 99)) {
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+ int dataVersion = nbttagcompound.getInt("DataVersion");
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+ if (!JUST_CORRUPT_IT && dataVersion > CURRENT_DATA_VERSION) {
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+ new RuntimeException("Server attempted to load chunk saved with newer version of minecraft! " + dataVersion + " > " + CURRENT_DATA_VERSION).printStackTrace();
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+ System.exit(1);
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+ }
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+ }
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+ // Paper end
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WorldChunkManager worldchunkmanager = chunkgenerator.getWorldChunkManager();
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NBTTagCompound nbttagcompound1 = nbttagcompound.getCompound("Level"); // Paper - diff on change, see ChunkRegionLoader#getChunkCoordinate
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ChunkCoordIntPair chunkcoordintpair1 = new ChunkCoordIntPair(nbttagcompound1.getInt("xPos"), nbttagcompound1.getInt("zPos")); // Paper - diff on change, see ChunkRegionLoader#getChunkCoordinate
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