AbstractRemapJarTask: Fix manifests not being inherited (#1421)

* AbstractRemapJarTask: Fix manifests not being inherited

* Copy manifest before applying manifest service

This matches the original ordering of the manifest creation,
and fixes the override functionality in the service.

* Test merging named sections

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

@@ -34,6 +34,7 @@ import java.util.ArrayList;
 import java.util.Collections;
 import java.util.List;
 import java.util.Map;
+import java.util.jar.Attributes;
 import java.util.jar.Manifest;
 
 import javax.inject.Inject;
@@ -74,6 +75,12 @@ import net.fabricmc.loom.util.gradle.SourceSetHelper;
 import net.fabricmc.loom.util.service.ScopedServiceFactory;
 
 public abstract class AbstractRemapJarTask extends Jar {
+	/**
+	 * The main input jar to remap.
+	 * Other contents can be added to this task, but this jar must always be present.
+	 *
+	 * <p>The input file's manifest will be copied into the remapped jar.
+	 */
 	@InputFile
 	public abstract RegularFileProperty getInputFile();
 
@@ -143,6 +150,7 @@ public abstract class AbstractRemapJarTask extends Jar {
 		final WorkQueue workQueue = getWorkerExecutor().noIsolation();
 
 		workQueue.submit(workAction, params -> {
+			params.getInputFile().set(getInputFile());
 			params.getArchiveFile().set(getArchiveFile());
 
 			params.getSourceNamespace().set(getSourceNamespace());
@@ -181,6 +189,7 @@ public abstract class AbstractRemapJarTask extends Jar {
 	protected abstract Provider<? extends ClientEntriesService.Options> getClientOnlyEntriesOptionsProvider(SourceSet clientSourceSet);
 
 	public interface AbstractRemapParams extends WorkParameters {
+		RegularFileProperty getInputFile();
 		RegularFileProperty getArchiveFile();
 
 		Property<String> getSourceNamespace();
@@ -242,11 +251,20 @@ public abstract class AbstractRemapJarTask extends Jar {
 			}
 		}
 
+		// Note: the inputFile parameter is the remapping input file.
+		// The main input jar is available in the parameters, but should not be used
+		// for remapping as it might be missing some files added manually to this task.
 		protected abstract void execute(Path inputFile) throws IOException;
 
 		protected void modifyJarManifest() throws IOException {
 			int count = ZipUtils.transform(outputFile, Map.of(Constants.Manifest.PATH, bytes -> {
 				var manifest = new Manifest(new ByteArrayInputStream(bytes));
+				byte[] sourceManifestBytes = ZipUtils.unpackNullable(getParameters().getInputFile().get().getAsFile().toPath(), Constants.Manifest.PATH);
+
+				if (sourceManifestBytes != null) {
+					var sourceManifest = new Manifest(new ByteArrayInputStream(sourceManifestBytes));
+					mergeManifests(manifest, sourceManifest);
+				}
 
 				getParameters().getJarManifestService().get().apply(manifest, getParameters().getManifestAttributes().get());
 				manifest.getMainAttributes().putValue(Constants.Manifest.MAPPING_NAMESPACE, getParameters().getTargetNamespace().get());
@@ -268,6 +286,24 @@ public abstract class AbstractRemapJarTask extends Jar {
 				ZipReprocessorUtil.reprocessZip(outputFile, isReproducibleFileOrder, isPreserveFileTimestamps, compression);
 			}
 		}
+
+		private static void mergeManifests(Manifest target, Manifest source) {
+			mergeAttributes(target.getMainAttributes(), source.getMainAttributes());
+
+			source.getEntries().forEach((name, sourceAttributes) -> {
+				final Attributes targetAttributes = target.getAttributes(name);
+
+				if (targetAttributes != null) {
+					mergeAttributes(targetAttributes, sourceAttributes);
+				} else {
+					target.getEntries().put(name, sourceAttributes);
+				}
+			});
+		}
+
+		private static void mergeAttributes(Attributes target, Attributes source) {
+			source.forEach(target::putIfAbsent);
+		}
 	}
 
 	@Deprecated

src/test/groovy/net/fabricmc/loom/test/integration/RemapJarContentsTest.groovy

@@ -51,6 +51,10 @@ class RemapJarContentsTest extends Specification implements GradleProjectTestTra
 		ZipUtils.contains(gradle.getOutputFile('fabric-example-mod-1.0.0-sources.jar').toPath(), 'test_src_file.txt')
 		def manifest = readManifest(gradle.getOutputFile('fabric-example-mod-1.0.0.jar'))
 		manifest.mainAttributes.getValue('Hello-World') == 'test'
+		manifest.mainAttributes.getValue('Inherited-In-Remap-Jar') == '1234'
+		manifest.getAttributes('fabric.mod.json').getValue('Inherited-In-Remap-Jar') == '5678'
+		manifest.getAttributes('modid.mixins.json').getValue('Hello-World') == 'another test'
+		manifest.getAttributes('modid.mixins.json').getValue('Inherited-In-Remap-Jar') == '9'
 
 		where:
 		version << STANDARD_TEST_VERSIONS

src/test/resources/projects/remapJarContents/build.gradle

@@ -78,11 +78,21 @@ publishing {
 	}
 }
 
+jar {
+	manifest {
+		attributes 'Inherited-In-Remap-Jar': '1234'
+		attributes(['Inherited-In-Remap-Jar': '5678'], 'fabric.mod.json') // category not present in remapJar
+		attributes(['Inherited-In-Remap-Jar': '9'], 'modid.mixins.json') // category present in remapJar
+		attributes 'Hello-World': 'shadowed in remapJar'
+	}
+}
+
 remapJar {
 	from 'test_file.txt'
 
 	manifest {
 		attributes 'Hello-World': 'test'
+		attributes(['Hello-World': 'another test'], 'modid.mixins.json')
 	}
 }