Change world storage layout to be closer to vanilla & implement migration

.github/workflows/build.yml

@@ -115,14 +115,14 @@ jobs:
 
       - name: Create Paperclip Jar
         if: fromJSON(steps.determine.outputs.result).action == 'paperclip'
-        run: ./gradlew createMojmapPaperclipJar --stacktrace
+        run: ./gradlew createPaperclipJar --stacktrace
 
       - name: Upload Paperclip Jar
         if: fromJSON(steps.determine.outputs.result).action == 'paperclip'
         uses: actions/upload-artifact@v4
         with:
           name: paper-${{ fromJSON(steps.determine.outputs.result).pr }}
-          path: paper-server/build/libs/paper-paperclip-*-mojmap.jar
+          path: paper-server/build/libs/paper-paperclip-*.jar
 
       - name: Publish Artifacts
         if: fromJSON(steps.determine.outputs.result).action == 'paperclip'

.gitignore

@@ -20,6 +20,7 @@ nbactions.xml
 bin/
 dist/
 manifest.mf
+__pycache__/
 
 # Mac filesystem dust
 .DS_Store/

gradle.properties

@@ -6,7 +6,7 @@ mcVersion=26.1
 apiVersion=26.1
 
 # Set to true while updating Minecraft version
-updatingMinecraft=true
+updatingMinecraft=false
 
 org.gradle.configuration-cache=true
 org.gradle.caching=true

paper-api/src/main/java/org/bukkit/Server.java

@@ -5,6 +5,7 @@
 import java.io.File;
 import java.io.Serializable;
 import java.net.InetAddress;
+import java.nio.file.Path;
 import java.util.Collection;
 import java.util.Collections;
 import java.util.Iterator;
@@ -1565,7 +1566,6 @@ default int broadcast(net.kyori.adventure.text.@NotNull Component message) {
     @NotNull
     public ConsoleCommandSender getConsoleSender();
 
-    // Paper start
     /**
      * Creates a special {@link CommandSender} which redirects command feedback (in the form of chat messages) to the
      * specified listener. The returned sender will have the same effective permissions as {@link #getConsoleSender()}.
@@ -1575,16 +1575,31 @@ default int broadcast(net.kyori.adventure.text.@NotNull Component message) {
      */
     @NotNull
     public CommandSender createCommandSender(final @NotNull java.util.function.Consumer<? super net.kyori.adventure.text.Component> feedback);
-    // Paper end
 
     /**
-     * Gets the folder that contains all the various {@link World}s.
+     * Gets the folder that contains {@link #getLevelDirectory()}.
+     *
+     * <p>This is usually the server's current working directory
+     * but can be overridden using command line flags (i.e. {@code --universe} or {@code --world-container}).</p>
      *
-     * @return folder that contains all worlds
+     * @return folder that contains the level directory
      */
+    @ApiStatus.Obsolete
     @NotNull
     public File getWorldContainer();
 
+    /**
+     * Gets the level directory.
+     *
+     * <p>This is the {@code ./world} directory in a fresh default server. Contains player data, dimensions, datapacks,
+     * and other world data.</p>
+     *
+     * @return the level directory
+     */
+    @ApiStatus.Experimental
+    @NotNull
+    Path getLevelDirectory();
+
     /**
      * Gets every player that has ever played on this server.
      * <p>

paper-api/src/main/java/org/bukkit/WorldCreator.java

@@ -31,11 +31,10 @@ public class WorldCreator {
      * @param name Name of the world that will be created
      */
     public WorldCreator(@NotNull String name) {
-        // Paper start
-        this(name, getWorldKey(name));
+        this(name, defaultWorldKey(name));
     }
 
-    private static NamespacedKey getWorldKey(String name) {
+    private static NamespacedKey defaultWorldKey(String name) {
         final String mainLevelName = Bukkit.getUnsafe().getMainLevelName();
         if (name.equals(mainLevelName)) {
             return NamespacedKey.minecraft("overworld");
@@ -58,6 +57,9 @@ public WorldCreator(@NotNull String levelName, @NotNull NamespacedKey worldKey)
         if (levelName == null || worldKey == null) {
             throw new IllegalArgumentException("World name and key cannot be null");
         }
+        if (!worldKey.equals(defaultWorldKey(levelName))) {
+            throw new UnsupportedOperationException("Custom world keys not yet implemented");
+        }
         this.name = levelName;
         this.seed = (new Random()).nextLong();
         this.key = worldKey;
@@ -104,7 +106,6 @@ public static WorldCreator ofNameAndKey(@NotNull String levelName, @NotNull Name
     public static WorldCreator ofKey(@NotNull NamespacedKey worldKey) {
         return new WorldCreator(worldKey);
     }
-    // Paper end
 
     /**
      * Copies the options from the specified world
@@ -589,7 +590,6 @@ public static BiomeProvider getBiomeProviderForName(@NotNull String world, @Null
         return result;
     }
 
-    // Paper start - keep spawn loaded tristate
     /**
      * Returns the current intent to keep the world loaded, @see {@link WorldCreator#keepSpawnLoaded(net.kyori.adventure.util.TriState)}
      *
@@ -615,5 +615,4 @@ public net.kyori.adventure.util.TriState keepSpawnLoaded() {
     public WorldCreator keepSpawnLoaded(@NotNull net.kyori.adventure.util.TriState keepSpawnLoaded) {
         return this;
     }
-    // Paper end - keep spawn loaded tristate
 }

paper-server/build.gradle.kts

@@ -23,7 +23,7 @@ paperweight {
     gitFilePatches = false
 
     updatingMinecraft {
-        oldPaperCommit = "7e80cef5198561d0db53406127e5b8bc7af51577"
+        // oldPaperCommit = "7e80cef5198561d0db53406127e5b8bc7af51577"
     }
 }
 

paper-server/patches/features/0002-Allow-Saving-of-Oversized-Chunks.patch

@@ -119,10 +119,10 @@ index 728ec122b7af090427cc7511a168336d539835a1..a60a417432cab517fd2fbfd4447c7cb7
 +    // Paper end
  }
 diff --git a/net/minecraft/world/level/chunk/storage/RegionFileStorage.java b/net/minecraft/world/level/chunk/storage/RegionFileStorage.java
-index 7c6f16fa3de0d344202ec456c648aaebf24a69ca..6b265cc308a14846c9ef3c96aa5daf06e246b8a8 100644
+index 4473503da2459016859b2d72ecd7825df23f4be4..76f83dfa2acbd0840718a022102d820bf65ac1be 100644
 --- a/net/minecraft/world/level/chunk/storage/RegionFileStorage.java
 +++ b/net/minecraft/world/level/chunk/storage/RegionFileStorage.java
-@@ -48,6 +48,43 @@ public final class RegionFileStorage implements AutoCloseable {
+@@ -49,6 +49,43 @@ public final class RegionFileStorage implements AutoCloseable {
          }
      }
 
@@ -166,7 +166,7 @@ index 7c6f16fa3de0d344202ec456c648aaebf24a69ca..6b265cc308a14846c9ef3c96aa5daf06
      public @Nullable CompoundTag read(final ChunkPos pos) throws IOException {
          // CraftBukkit start - SPIGOT-5680: There's no good reason to preemptively create files on read, save that for writing
          RegionFile region = this.getRegionFile(pos, true);
-@@ -55,6 +92,12 @@ public final class RegionFileStorage implements AutoCloseable {
+@@ -56,6 +93,12 @@ public final class RegionFileStorage implements AutoCloseable {
              return null;
          }
          // CraftBukkit end
@@ -179,7 +179,7 @@ index 7c6f16fa3de0d344202ec456c648aaebf24a69ca..6b265cc308a14846c9ef3c96aa5daf06
 
          CompoundTag var4;
          try (DataInputStream regionChunkInputStream = region.getChunkDataInputStream(pos)) {
-@@ -91,6 +134,7 @@ public final class RegionFileStorage implements AutoCloseable {
+@@ -92,6 +135,7 @@ public final class RegionFileStorage implements AutoCloseable {
              } else {
                  try (DataOutputStream output = region.getChunkDataOutputStream(pos)) {
                      NbtIo.write(value, output);

paper-server/patches/features/0003-Entity-Activation-Range-2.0.patch

@@ -354,18 +354,18 @@ index 0000000000000000000000000000000000000000..c18823746ab2edcab536cb1589b7720e
 +    }
 +}
 diff --git a/net/minecraft/server/level/ServerLevel.java b/net/minecraft/server/level/ServerLevel.java
-index 4f31c92c8c3b2757a4103a1b2a0ae158117eebd1..43c47bdd2fdb7731eec5301e20f923d0703a36fc 100644
+index 71446ef19c560f67d22697941973326e2b81bb60..6ea8d1c04afdaf2136dfd5fb3ab1899e8e62fc70 100644
 --- a/net/minecraft/server/level/ServerLevel.java
 +++ b/net/minecraft/server/level/ServerLevel.java
-@@ -591,6 +591,7 @@ public class ServerLevel extends Level implements WorldGenLevel, ServerEntityGet
+@@ -599,6 +599,7 @@ public class ServerLevel extends Level implements WorldGenLevel, ServerEntityGet
                  profiler.pop();
              }
 
 +            io.papermc.paper.entity.activation.ActivationRange.activateEntities(this); // Paper - EAR
              this.entityTickList
                  .forEach(
                      entity -> {
-@@ -1064,12 +1065,15 @@ public class ServerLevel extends Level implements WorldGenLevel, ServerEntityGet
+@@ -1072,12 +1073,15 @@ public class ServerLevel extends Level implements WorldGenLevel, ServerEntityGet
          entity.totalEntityAge++; // Paper - age-like counter for all entities
          profiler.push(entity.typeHolder()::getRegisteredName);
          profiler.incrementCounter("tickNonPassenger");
@@ -382,7 +382,7 @@ index 4f31c92c8c3b2757a4103a1b2a0ae158117eebd1..43c47bdd2fdb7731eec5301e20f923d0
          }
          // Paper start - log detailed entity tick information
          } finally {
-@@ -1080,7 +1084,7 @@ public class ServerLevel extends Level implements WorldGenLevel, ServerEntityGet
+@@ -1088,7 +1092,7 @@ public class ServerLevel extends Level implements WorldGenLevel, ServerEntityGet
          // Paper end - log detailed entity tick information
      }
 
@@ -391,7 +391,7 @@ index 4f31c92c8c3b2757a4103a1b2a0ae158117eebd1..43c47bdd2fdb7731eec5301e20f923d0
          if (entity.isRemoved() || entity.getVehicle() != vehicle) {
              entity.stopRiding();
          } else if (entity instanceof Player || this.entityTickList.contains(entity)) {
-@@ -1090,12 +1094,21 @@ public class ServerLevel extends Level implements WorldGenLevel, ServerEntityGet
+@@ -1098,12 +1102,21 @@ public class ServerLevel extends Level implements WorldGenLevel, ServerEntityGet
              ProfilerFiller profiler = Profiler.get();
              profiler.push(entity.typeHolder()::getRegisteredName);
              profiler.incrementCounter("tickPassenger");
@@ -462,7 +462,7 @@ index 6309a615ba2525437758b1fe39c43060ec42d6f8..677b0cadec2270537d868aac7d0acaf7
      public void tick() {
          super.tick();
 diff --git a/net/minecraft/world/entity/Entity.java b/net/minecraft/world/entity/Entity.java
-index 931a886ab969009c1dc672e3108a0e65f888e0f4..83602c8ee3e2d6064fea66a915f427ffe1584b5a 100644
+index a480a35b23f38680598cb428bd09b7d1db07af6e..9ea33286ac0d4691dbc6b607a18b6688ca1724e9 100644
 --- a/net/minecraft/world/entity/Entity.java
 +++ b/net/minecraft/world/entity/Entity.java
 @@ -426,6 +426,15 @@ public abstract class Entity
@@ -521,7 +521,7 @@ index 931a886ab969009c1dc672e3108a0e65f888e0f4..83602c8ee3e2d6064fea66a915f427ff
              delta = this.maybeBackOffFromEdge(delta, moverType);
              Vec3 movement = this.collide(delta);
 diff --git a/net/minecraft/world/entity/LivingEntity.java b/net/minecraft/world/entity/LivingEntity.java
-index e0e6c0f1ab9609fb64db4dfd436414d7ce12dd12..cbcef6d9d4113e318237df4501839d6870042c8d 100644
+index 9d579b7f17dc38c9e92447ea27ec71a8967a9964..30d518454e7a48b42242184203ab583b19b3e770 100644
 --- a/net/minecraft/world/entity/LivingEntity.java
 +++ b/net/minecraft/world/entity/LivingEntity.java
 @@ -3385,6 +3385,14 @@ public abstract class LivingEntity extends Entity implements Attackable, Waypoin
@@ -540,7 +540,7 @@ index e0e6c0f1ab9609fb64db4dfd436414d7ce12dd12..cbcef6d9d4113e318237df4501839d68
      public void tick() {
          super.tick();
 diff --git a/net/minecraft/world/entity/Mob.java b/net/minecraft/world/entity/Mob.java
-index dab431458aa93349a9f09e8e3502a8b8b11a1653..2c7efcc76da5c2d1596bd15128fa27d77acc152d 100644
+index c7c53ef16e104ebc48aeb8719783fb4c45d39fc2..90eaa775dc134041647618c3b965334a9bb9fd3b 100644
 --- a/net/minecraft/world/entity/Mob.java
 +++ b/net/minecraft/world/entity/Mob.java
 @@ -211,6 +211,19 @@ public abstract class Mob extends LivingEntity implements Targeting, EquipmentUs
@@ -673,7 +673,7 @@ index a4f719c1b1b6a8920068ed8969a9e780420eade1..3791ffa6a14a1b2304780382e19f0e38
      public void tick() {
          if (this.getItem().isEmpty()) {
 diff --git a/net/minecraft/world/entity/npc/villager/Villager.java b/net/minecraft/world/entity/npc/villager/Villager.java
-index e7df6fb302abc958608090e84052eccb3190ed95..df50e6ac986cd388f02d405186f2855e42638eac 100644
+index a80e6a23cf29cb44943339101f15565dbc19af1f..f481fd661440f77c98940cbde4a8b95818e4a22c 100644
 --- a/net/minecraft/world/entity/npc/villager/Villager.java
 +++ b/net/minecraft/world/entity/npc/villager/Villager.java
 @@ -244,11 +244,35 @@ public class Villager extends AbstractVillager implements VillagerDataHolder, Re
@@ -816,7 +816,7 @@ index 3a590d4dc980a2912e9cc043d8c8db4cf9d60803..06ab7c48b18c03af494ab10fc2b584ce
 +
  }
 diff --git a/net/minecraft/world/level/Level.java b/net/minecraft/world/level/Level.java
-index 8c5725b83a82b4297aecebc5220e9b3160746923..ad39c0822f757216d817934ba18440c228dc6be3 100644
+index 16ca35249e2248500073bb2b12447d2a0e545b95..00be50d2b8de3b5084c14c2e02eaf97f76ed5e49 100644
 --- a/net/minecraft/world/level/Level.java
 +++ b/net/minecraft/world/level/Level.java
 @@ -153,6 +153,12 @@ public abstract class Level implements LevelAccessor, AutoCloseable {

paper-server/patches/features/0014-Add-Alternate-Current-redstone-implementation.patch

@@ -2326,18 +2326,18 @@ index 0000000000000000000000000000000000000000..298076a0db4e6ee6e4775ac43bf749d9
 +    }
 +}
 diff --git a/net/minecraft/server/level/ServerLevel.java b/net/minecraft/server/level/ServerLevel.java
-index 43c47bdd2fdb7731eec5301e20f923d0703a36fc..75068c07d1892882a85e27e30da8ac9906cf16e7 100644
+index 6ea8d1c04afdaf2136dfd5fb3ab1899e8e62fc70..59ccc7a7c3a93a69e78061d4c091705658f38f48 100644
 --- a/net/minecraft/server/level/ServerLevel.java
 +++ b/net/minecraft/server/level/ServerLevel.java
 @@ -232,6 +232,7 @@ public class ServerLevel extends Level implements WorldGenLevel, ServerEntityGet
-     public final net.minecraft.world.level.storage.LevelDataAndDimensions.WorldDataAndGenSettings worldDataAndGenSettings;
+     public final WorldGenSettings worldGenSettings;
      public boolean hasPhysicsEvent = true; // Paper - BlockPhysicsEvent
      public boolean hasEntityMoveEvent; // Paper - Add EntityMoveEvent
 +    private final alternate.current.wire.WireHandler wireHandler = new alternate.current.wire.WireHandler(this); // Paper - optimize redstone (Alternate Current)
 
      @Override
      public @Nullable LevelChunk getChunkIfLoaded(int x, int z) {
-@@ -2434,6 +2435,13 @@ public class ServerLevel extends Level implements WorldGenLevel, ServerEntityGet
+@@ -2432,6 +2433,13 @@ public class ServerLevel extends Level implements WorldGenLevel, ServerEntityGet
          return this.debugSynchronizers;
      }
 
@@ -2352,10 +2352,10 @@ index 43c47bdd2fdb7731eec5301e20f923d0703a36fc..75068c07d1892882a85e27e30da8ac99
          return toLevel.dimension() != Level.NETHER || this.getGameRules().get(GameRules.ALLOW_ENTERING_NETHER_USING_PORTALS);
      }
 diff --git a/net/minecraft/world/level/Level.java b/net/minecraft/world/level/Level.java
-index ad39c0822f757216d817934ba18440c228dc6be3..52e870443337adbd7a573cbc49a0b094a84a905d 100644
+index 00be50d2b8de3b5084c14c2e02eaf97f76ed5e49..f56bf11ef2202b78635951f511f468231fd7e13a 100644
 --- a/net/minecraft/world/level/Level.java
 +++ b/net/minecraft/world/level/Level.java
-@@ -1446,6 +1446,17 @@ public abstract class Level implements LevelAccessor, AutoCloseable {
+@@ -1447,6 +1447,17 @@ public abstract class Level implements LevelAccessor, AutoCloseable {
          return this.palettedContainerFactory;
      }