[gradle-plugin] Publish Kotlin metadata variant

Fix for KT-27500.

tools/kotlin-native-gradle-plugin/src/main/kotlin/org/jetbrains/kotlin/gradle/plugin/experimental/internal/KotlinNativeMainComponent.kt

@@ -17,6 +17,7 @@
 package org.jetbrains.kotlin.gradle.plugin.experimental.internal
 
 import org.gradle.api.Project
+import org.gradle.api.attributes.Usage
 import org.gradle.api.component.ComponentWithVariants
 import org.gradle.api.component.SoftwareComponent
 import org.gradle.api.internal.component.SoftwareComponentInternal
@@ -30,8 +31,11 @@ import org.gradle.internal.DisplayName
 import org.gradle.language.ProductionComponent
 import org.gradle.language.cpp.internal.NativeVariantIdentity
 import org.gradle.language.nativeplatform.internal.PublicationAwareComponent
+import org.jetbrains.kotlin.gradle.plugin.EXPECTED_BY_CONFIG_NAME
+import org.jetbrains.kotlin.gradle.plugin.KotlinPlatformType
 import org.jetbrains.kotlin.gradle.plugin.experimental.KotlinNativeBinary
 import org.jetbrains.kotlin.gradle.plugin.experimental.sourcesets.KotlinNativeSourceSetImpl
+import org.jetbrains.kotlin.gradle.plugin.mpp.KotlinUsages
 import javax.inject.Inject
 
 open class KotlinNativeMainComponent @Inject constructor(
@@ -50,6 +54,13 @@ open class KotlinNativeMainComponent @Inject constructor(
         set(mutableSetOf(OutputKind.KLIBRARY))
     }
 
+    private val metadataDependencies = project.configurations.create(names.withPrefix("metadata")).apply {
+        isCanBeConsumed = false
+        attributes.attribute(Usage.USAGE_ATTRIBUTE, project.objects.named(Usage::class.java, KotlinUsages.KOTLIN_API))
+        attributes.attribute(KotlinPlatformType.attribute, KotlinPlatformType.common)
+        extendsFrom(getImplementationDependencies())
+    }
+
     private val mainPublication = KotlinNativeVariant()
 
     override fun getMainPublication(): KotlinNativeVariant = mainPublication
@@ -89,8 +100,8 @@ open class KotlinNativeMainComponent @Inject constructor(
 
         override fun getName(): String = this@KotlinNativeMainComponent.name
 
-        override fun getUsages(): Set<UsageContext> = emptySet()
+        override fun getUsages(): Set<UsageContext> =
-
+            setOf(MetadataUsageContext("metadata-api", project.objects, metadataDependencies))
     }
     // endregion
 

tools/kotlin-native-gradle-plugin/src/main/kotlin/org/jetbrains/kotlin/gradle/plugin/experimental/internal/MetadataUsageContext.kt

@@ -0,0 +1,35 @@
+package org.jetbrains.kotlin.gradle.plugin.experimental.internal
+
+import org.gradle.api.Named
+import org.gradle.api.artifacts.*
+import org.gradle.api.attributes.AttributeContainer
+import org.gradle.api.attributes.Usage
+import org.gradle.api.capabilities.Capability
+import org.gradle.api.internal.component.UsageContext
+import org.gradle.api.model.ObjectFactory
+import org.jetbrains.kotlin.gradle.plugin.mpp.KotlinUsages
+
+class MetadataUsageContext(
+    private val _name: String,
+    val objects: ObjectFactory,
+    val configuration: Configuration
+): UsageContext, Named {
+
+    override fun getUsage(): Usage = objects.named(Usage::class.java, KotlinUsages.KOTLIN_API)
+    override fun getName(): String = _name
+
+    override fun getCapabilities(): Set<Capability> = emptySet()
+    override fun getGlobalExcludes(): Set<ExcludeRule> = emptySet()
+
+    override fun getDependencies(): Set<out ModuleDependency> =
+        configuration.incoming.dependencies.withType(ModuleDependency::class.java)
+
+    override fun getDependencyConstraints(): MutableSet<out DependencyConstraint> =
+        configuration.incoming.dependencyConstraints
+
+    override fun getArtifacts(): MutableSet<out PublishArtifact> =
+        configuration.outgoing.artifacts
+
+    override fun getAttributes(): AttributeContainer =
+        configuration.outgoing.attributes
+}

tools/kotlin-native-gradle-plugin/src/test/kotlin/ExperimentalPluginTests.kt

@@ -900,7 +900,7 @@ class ExperimentalPluginTests {
                 version '1.0'
 
                 sourceSets.main.component {
-                    targets = ['wasm32']
+                    targets = ['wasm32', 'host']
                 }
 
                 publishing {
@@ -935,10 +935,6 @@ class ExperimentalPluginTests {
                         commonMain {
                             dependencies {
                                 implementation 'org.jetbrains.kotlin:kotlin-stdlib-common'
-                            }
-                        }
-                        wasmMain {
-                            dependencies {
                                 implementation 'test:native-producer:1.0'
                             }
                         }
@@ -974,8 +970,12 @@ class ExperimentalPluginTests {
             buildFile.writeText("""
                 plugins {
                     id 'kotlin-native'
+                    id 'maven-publish'
                 }
 
+                group 'test'
+                version '1.0'
+
                 repositories {
                     maven { url '$repoPath' }
                     maven { url "${MultiplatformSpecification.KOTLIN_REPO}" }
@@ -989,20 +989,72 @@ class ExperimentalPluginTests {
                 dependencies {
                     implementation 'test:mpp:1.0'
                 }
+
+                publishing {
+                    repositories {
+                        maven { url = '$repoPath' }
+                    }
+                }
             """.trimIndent())
 
             settingsFile.appendText("enableFeaturePreview('GRADLE_METADATA')")
             generateSrcFile("consumer.kt", "fun consumer() = mpp()")
         }
 
+        val mppConsumer = KonanProject.createEmpty(tmpFolder.newFolder("mpp-consumer")).apply {
+            buildFile.writeText("""
+                plugins {
+                    id 'org.jetbrains.kotlin.multiplatform' version '${MultiplatformSpecification.KOTLIN_VERSION}'
+                }
+
+                group 'test'
+                version '1.0'
+
+                repositories {
+                    maven { url '$repoPath' }
+                    maven { url "${MultiplatformSpecification.KOTLIN_REPO}" }
+                    jcenter()
+                }
+
+                kotlin {
+                    sourceSets {
+                        commonMain.dependencies {
+                            implementation 'org.jetbrains.kotlin:kotlin-stdlib-common'
+                            implementation 'test:native-consumer:1.0'
+                        }
+                    }
+
+                    targets {
+                        fromPreset(presets.wasm32, 'wasm')
+                    }
+                }
+            """.trimIndent())
+
+            settingsFile.writeText("""
+                pluginManagement {
+                    repositories {
+                        maven { url "${MultiplatformSpecification.KOTLIN_REPO}" }
+                        jcenter()
+                    }
+                }
+                enableFeaturePreview('GRADLE_METADATA')
+            """.trimIndent())
+        }
+
         nativeProducer.createRunner().withArguments("publish").build()
         mpp.createRunner().withArguments("publish").build()
-        nativeConsumer.createRunner().withArguments("build").build()
+        mpp.createRunner().withArguments("dependencies").build().also {
+            assertFalse(it.output.contains("FAILED"))
+        }
+        nativeConsumer.createRunner().withArguments("publish").build()
+        mppConsumer.createRunner().withArguments("dependencies").build().also {
+            assertFalse(it.output.contains("FAILED"))
+        }
 
         val publishedFiles = listOf(
             "repo/test/native-producer/1.0/native-producer-1.0.module",
-            "repo/test/native-producer_debug/1.0/native-producer_debug-1.0.module",
+            "repo/test/native-producer_debug_wasm32/1.0/native-producer_debug_wasm32-1.0.module",
-            "repo/test/native-producer_debug/1.0/native-producer_debug-1.0.klib",
+            "repo/test/native-producer_debug_wasm32/1.0/native-producer_debug_wasm32-1.0.klib",
             "repo/test/mpp/1.0/mpp-1.0.module",
             "repo/test/mpp-wasm/1.0/mpp-wasm-1.0.module",
             "repo/test/mpp-wasm/1.0/mpp-wasm-1.0.klib"