Fix Forge 50 (1.20.6)

.github/workflows/test-push.yml

@@ -148,3 +148,53 @@ jobs:
         with:
           name: Reproducible Build ${{ matrix.os }} (${{ matrix.java }}) Results
           path: build/reports/
+
+  # Special case this test to run on Java 21
+  neoForge1206Test:
+    needs: build
+
+    strategy:
+      fail-fast: false
+      matrix:
+        java: [ 21 ]
+        os: [ ubuntu-22.04 ]
+
+    runs-on: ${{ matrix.os }}
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/setup-java@v4
+        with:
+          java-version: ${{ matrix.java }}
+          distribution: 'temurin'
+
+      - run: ./gradlew test --tests *NeoForge1206Test --stacktrace --warning-mode fail
+
+      - uses: actions/upload-artifact@v4
+        if: ${{ failure() }}
+        with:
+          name: NeoForge 1.20.6 Build Results
+  # Special case this test to run on Java 21
+  forge1206Test:
+    needs: build
+
+    strategy:
+      fail-fast: false
+      matrix:
+        java: [ 21 ]
+        os: [ ubuntu-22.04 ]
+
+    runs-on: ${{ matrix.os }}
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/setup-java@v4
+        with:
+          java-version: ${{ matrix.java }}
+          distribution: 'temurin'
+
+      - run: ./gradlew test --tests *Forge1206Test --stacktrace --warning-mode fail
+
+      - uses: actions/upload-artifact@v4
+        if: ${{ failure() }}
+        with:
+          name: Forge 1.20.6 Build Results
+          path: build/reports/

build.gradle

@@ -423,6 +423,11 @@ task writeActionsTestMatrix() {
 					return
 				}
 
+				if (it.name.endsWith("NeoForge1206Test.groovy") || it.name.endsWith("Forge1206Test.groovy")) {
+					// Arch: The 1.20.6 tests require Java 21
+					return
+				}
+
 				def className = it.path.toString().replace(".groovy", "")
 				className = className.substring(className.lastIndexOf("integration/") + "integration/".length()).replace('/', '.')
 

gradle/runtime.libs.versions.toml

@@ -19,7 +19,7 @@ access-transformers-new = "8.0.5"
 access-transformers-neo = "10.0.2"
 unprotect = "1.2.0"
 asm = "9.7"
-union-relauncher = "1.0.0"
+union-relauncher = "1.1.0"
 access-transformers-log4j = "2.17.1"
 
 [libraries]

src/main/java/net/fabricmc/loom/build/IntermediaryNamespaces.java

@@ -37,6 +37,14 @@ public static String intermediary(Project project) {
 		return intermediaryNamespace(project).toString();
 	}
 
+	/**
+	 * Returns the runtime intermediary namespace of the project.
+	 * This is the namespace used in the compiled jar.
+	 */
+	public static String runtimeIntermediary(Project project) {
+		return runtimeIntermediaryNamespace(project).toString();
+	}
+
 	/**
 	 * Returns the intermediary namespace of the project.
 	 */
@@ -49,6 +57,15 @@ public static MappingsNamespace intermediaryNamespace(Project project) {
 		};
 	}
 
+	/**
+	 * Returns the intermediary namespace of the project.
+	 */
+	public static MappingsNamespace runtimeIntermediaryNamespace(Project project) {
+		LoomGradleExtension extension = LoomGradleExtension.get(project);
+		if (extension.isForge() && extension.getForgeProvider().usesMojangAtRuntime()) return MappingsNamespace.MOJANG;
+		return intermediaryNamespace(project);
+	}
+
 	/**
 	 * Potentially replaces the remapping target namespace for mixin refmaps.
 	 *
@@ -62,6 +79,6 @@ public static MappingsNamespace intermediaryNamespace(Project project) {
 	 * @return the correct namespace to use
 	 */
 	public static String replaceMixinIntermediaryNamespace(Project project, String namespace) {
-		return namespace.equals(intermediary(project)) ? MappingsNamespace.INTERMEDIARY.toString() : namespace;
+		return namespace.equals(runtimeIntermediary(project)) ? MappingsNamespace.INTERMEDIARY.toString() : namespace;
 	}
 }

src/main/java/net/fabricmc/loom/configuration/mods/ModProcessor.java

@@ -165,7 +165,7 @@ private void stripNestedJars(Path path) {
 	private void remapJars(List<ModDependency> remapList) throws IOException {
 		final LoomGradleExtension extension = LoomGradleExtension.get(project);
 		final MappingConfiguration mappingConfiguration = extension.getMappingConfiguration();
-		String fromM = IntermediaryNamespaces.intermediary(project);
+		String fromM = IntermediaryNamespaces.runtimeIntermediary(project);
 
 		Stopwatch stopwatch = Stopwatch.createStarted();
 

src/main/java/net/fabricmc/loom/configuration/providers/forge/ForgeProvider.java

@@ -60,6 +60,10 @@ public ForgeVersion getVersion() {
 		return version;
 	}
 
+	public boolean usesMojangAtRuntime() {
+		return platform == ModPlatform.NEOFORGE || version.getMajorVersion() >= Constants.Forge.MIN_USE_MOJANG_NS_VERSION;
+	}
+
 	public File getGlobalCache() {
 		if (globalCache == null) {
 			globalCache = getMinecraftProvider().dir(platform.id() + "/" + version.getCombined());

src/main/java/net/fabricmc/loom/configuration/providers/mappings/MappingConfiguration.java

@@ -35,17 +35,18 @@
 import java.nio.file.NoSuchFileException;
 import java.nio.file.Path;
 import java.nio.file.StandardCopyOption;
+import java.nio.file.StandardOpenOption;
 import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.HashMap;
 import java.util.List;
 import java.util.Map;
 import java.util.Objects;
 
+import org.apache.tools.ant.util.StringUtils;
 import com.google.common.base.Stopwatch;
 import com.google.gson.JsonObject;
 import dev.architectury.loom.util.MappingOption;
-import org.apache.tools.ant.util.StringUtils;
 import org.gradle.api.Project;
 import org.gradle.api.artifacts.Configuration;
 import org.jetbrains.annotations.Nullable;
@@ -211,28 +212,20 @@ public void setupPost(Project project) throws IOException {
 			// Generate the Mojmap-merged mappings if needed.
 			// Note that this needs to happen before manipulateMappings for FieldMigratedMappingConfiguration.
 			if (Files.notExists(tinyMappingsWithMojang) || extension.refreshDeps()) {
-				final Stopwatch stopwatch = Stopwatch.createStarted();
-				final MappingContext context = new GradleMappingContext(project, "tmp-neoforge");
-
-				try (Tiny2FileWriter writer = new Tiny2FileWriter(Files.newBufferedWriter(tinyMappingsWithMojang), false)) {
-					ForgeMappingsMerger.mergeMojang(context, tinyMappings, null, true).accept(writer);
-				}
-
-				project.getLogger().info(":merged mojang mappings in {}", stopwatch.stop());
+				mergeMojang(project, tinyMappings, tinyMappingsWithMojang);
 			}
 		}
 
 		if (extension.shouldGenerateSrgTiny()) {
 			if (Files.notExists(tinyMappingsWithSrg) || extension.refreshDeps()) {
-				// Merge tiny mappings with srg
-				Stopwatch stopwatch = Stopwatch.createStarted();
-				ForgeMappingsMerger.ExtraMappings extraMappings = ForgeMappingsMerger.ExtraMappings.ofMojmapTsrg(getMojmapSrgFileIfPossible(project));
-
-				try (Tiny2FileWriter writer = new Tiny2FileWriter(Files.newBufferedWriter(tinyMappingsWithSrg), false)) {
-					ForgeMappingsMerger.mergeSrg(getRawSrgFile(project), tinyMappings, extraMappings, true).accept(writer);
+				if (extension.isForge() && extension.getForgeProvider().usesMojangAtRuntime()) {
+					Path tmp = Files.createTempFile("mappings", ".tiny");
+					mergeMojang(project, tinyMappings, tmp);
+					mergeSrg(project, tmp, tinyMappingsWithSrg);
+					Files.deleteIfExists(tmp);
+				} else {
+					mergeSrg(project, tinyMappings, tinyMappingsWithSrg);
 				}
-
-				project.getLogger().info(":merged srg mappings in " + stopwatch.stop());
 			}
 		}
 
@@ -288,6 +281,28 @@ public static Path getMojmapSrgFileIfPossible(Project project) {
 		}
 	}
 
+	private static void mergeMojang(Project project, Path source, Path target) throws IOException {
+		final Stopwatch stopwatch = Stopwatch.createStarted();
+		final MappingContext context = new GradleMappingContext(project, "tmp-mojang");
+
+		try (Tiny2FileWriter writer = new Tiny2FileWriter(Files.newBufferedWriter(target, StandardOpenOption.CREATE, StandardOpenOption.TRUNCATE_EXISTING), false)) {
+			ForgeMappingsMerger.mergeMojang(context, source, null, true).accept(writer);
+		}
+
+		project.getLogger().info(":merged mojang mappings in {}", stopwatch.stop());
+	}
+
+	private static void mergeSrg(Project project, Path source, Path target) throws IOException {
+		Stopwatch stopwatch = Stopwatch.createStarted();
+		ForgeMappingsMerger.ExtraMappings extraMappings = ForgeMappingsMerger.ExtraMappings.ofMojmapTsrg(getMojmapSrgFileIfPossible(project));
+
+		try (Tiny2FileWriter writer = new Tiny2FileWriter(Files.newBufferedWriter(target, StandardOpenOption.CREATE, StandardOpenOption.TRUNCATE_EXISTING), false)) {
+			ForgeMappingsMerger.mergeSrg(getRawSrgFile(project), source, extraMappings, true).accept(writer);
+		}
+
+		project.getLogger().info(":merged srg mappings in " + stopwatch.stop());
+	}
+
 	protected void manipulateMappings(Project project, Path mappingsJar) throws IOException {
 	}
 

src/main/java/net/fabricmc/loom/extension/MixinExtensionApiImpl.java

@@ -50,10 +50,10 @@ public abstract class MixinExtensionApiImpl implements MixinExtensionAPI {
 	public MixinExtensionApiImpl(Project project) {
 		this.project = Objects.requireNonNull(project);
 		this.useMixinAp = project.getObjects().property(Boolean.class)
-				.convention(project.provider(() -> !LoomGradleExtension.get(project).isNeoForge()));
+				.convention(project.provider(() -> !LoomGradleExtension.get(project).isNeoForge() && (!LoomGradleExtension.get(project).isForge() || !LoomGradleExtension.get(project).getForgeProvider().usesMojangAtRuntime())));
 
 		this.refmapTargetNamespace = project.getObjects().property(String.class)
-				.convention(project.provider(() -> IntermediaryNamespaces.intermediary(project)));
+				.convention(project.provider(() -> IntermediaryNamespaces.runtimeIntermediary(project)));
 		this.refmapTargetNamespace.finalizeValueOnRead();
 
 		this.messages = project.getObjects().mapProperty(String.class, String.class);

src/main/java/net/fabricmc/loom/task/AbstractRemapJarTask.java

@@ -116,7 +116,7 @@ public abstract class AbstractRemapJarTask extends Jar {
 	@Inject
 	public AbstractRemapJarTask() {
 		getSourceNamespace().convention(MappingsNamespace.NAMED.toString()).finalizeValueOnRead();
-		getTargetNamespace().convention(IntermediaryNamespaces.intermediary(getProject())).finalizeValueOnRead();
+		getTargetNamespace().convention(getProject().provider(() -> IntermediaryNamespaces.runtimeIntermediary(getProject()))).finalizeValueOnRead();
 		getRemapperIsolation().convention(true).finalizeValueOnRead();
 		getIncludesClientOnlyClasses().convention(false).finalizeValueOnRead();
 		getJarType().finalizeValueOnRead();

src/main/java/net/fabricmc/loom/util/Constants.java

@@ -186,6 +186,11 @@ public static final class Forge {
 		public static final String UNION_RELAUNCHER_MAIN_CLASS = "juuxel.unionrelauncher.UnionRelauncher";
 		public static final String UNION_RELAUNCHER_MAIN_CLASS_PROPERTY = "unionRelauncher.mainClass";
 
+		/**
+		 * The minimum version of Forge that uses "mojang" as the namespace at runtime.
+		 */
+		public static final int MIN_USE_MOJANG_NS_VERSION = 50;
+
 		private Forge() {
 		}
 	}

src/main/java/net/fabricmc/loom/util/SourceRemapper.java

@@ -65,7 +65,7 @@ public class SourceRemapper {
 	private Mercury mercury;
 
 	public SourceRemapper(Project project, SharedServiceManager serviceManager, boolean toNamed) {
-		this(project, serviceManager, toNamed ? IntermediaryNamespaces.intermediary(project) : "named", !toNamed ? IntermediaryNamespaces.intermediary(project) : "named");
+		this(project, serviceManager, toNamed ? IntermediaryNamespaces.runtimeIntermediary(project) : "named", !toNamed ? IntermediaryNamespaces.runtimeIntermediary(project) : "named");
 	}
 
 	public SourceRemapper(Project project, SharedServiceManager serviceManager, String from, String to) {

src/main/java/net/fabricmc/loom/util/srg/CoreModClassRemapper.java

@@ -61,7 +61,7 @@ public final class CoreModClassRemapper {
 
 	public static void remapJar(Project project, ModPlatform platform, Path jar, MappingTree mappings) throws IOException {
 		final Logger logger = project.getLogger();
-		final String sourceNamespace = IntermediaryNamespaces.intermediary(project);
+		final String sourceNamespace = IntermediaryNamespaces.runtimeIntermediary(project);
 
 		try (FileSystemUtil.Delegate fs = FileSystemUtil.getJarFileSystem(jar, false)) {
 			Path coremodsJsonPath = fs.getPath("META-INF", "coremods.json");

src/main/java/net/fabricmc/loom/util/srg/ForgeMappingsMerger.java

@@ -65,6 +65,7 @@
  */
 public final class ForgeMappingsMerger {
 	private static final List<String> INPUT_NAMESPACES = List.of("official", "intermediary", "named");
+	private static final List<String> INPUT_NAMESPACES_WITH_MOJANG = List.of("official", "mojang", "intermediary", "named");
 	private final MemoryMappingTree newNs;
 	private final MemoryMappingTree src;
 	private final MemoryMappingTree output;
@@ -111,8 +112,8 @@ private static MemoryMappingTree readInput(Path tiny) throws IOException {
 		List<String> inputNamespaces = new ArrayList<>(src.getDstNamespaces());
 		inputNamespaces.add(0, src.getSrcNamespace());
 
-		if (!inputNamespaces.equals(INPUT_NAMESPACES)) {
-			throw new MappingException("Mapping file " + tiny + " does not have 'official, intermediary, named' as its namespaces! Found: " + inputNamespaces);
+		if (!inputNamespaces.equals(INPUT_NAMESPACES) && !inputNamespaces.equals(INPUT_NAMESPACES_WITH_MOJANG)) {
+			throw new MappingException("Mapping file " + tiny + " does not have 'official(, mojang), intermediary, named' as its namespaces! Found: " + inputNamespaces);
 		}
 
 		return src;

src/test/groovy/net/fabricmc/loom/test/integration/forge/Forge1206Test.groovy

@@ -0,0 +1,60 @@
+/*
+ * This file is part of fabric-loom, licensed under the MIT License (MIT).
+ *
+ * Copyright (c) 2024 FabricMC
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+
+package net.fabricmc.loom.test.integration.forge
+
+import spock.lang.Specification
+import spock.lang.Unroll
+
+import net.fabricmc.loom.test.util.GradleProjectTestTrait
+
+import static net.fabricmc.loom.test.LoomTestConstants.DEFAULT_GRADLE
+import static org.gradle.testkit.runner.TaskOutcome.SUCCESS
+
+class Forge1206Test extends Specification implements GradleProjectTestTrait {
+	@Unroll
+	def "build #mcVersion #neoforgeVersion #mappings #patches"() {
+		if (Integer.valueOf(System.getProperty("java.version").split("\\.")[0]) < 21) {
+			println("This test requires Java 21. Currently you have Java ${System.getProperty("java.version")}.")
+			return
+		}
+
+		setup:
+		def gradle = gradleProject(project: "forge/1206", version: DEFAULT_GRADLE)
+		gradle.buildGradle.text = gradle.buildGradle.text.replace('@MCVERSION@', mcVersion)
+				.replace('@FORGEVERSION@', neoforgeVersion)
+				.replace('MAPPINGS', mappings) // Spotless doesn't like the @'s
+				.replace('PATCHES', patches)
+
+		when:
+		def result = gradle.run(task: "build")
+
+		then:
+		result.task(":build").outcome == SUCCESS
+
+		where:
+		mcVersion | neoforgeVersion | mappings | patches
+		'1.20.6'  | '1.20.6-50.1.3' | 'loom.officialMojangMappings()' | ''
+	}
+}