IssueTracker

In a multiplatform project, generating a static resource file from a task and adding it to a source sets resources with jvmMain correctly sets up task dependencies and runs as part of assemble.

sourceSets.jvmMain.resources.srcDir(generateStaticResourceTask.map { it.outputDir }

However doing the same thing with androidMain does not.

sourceSets.androidMain.resources.srcDir(generateStaticResourceTask.map { it.outputDir }

I'm not sure if this is user error, an issue in AGP, an issue with KGP, or something else but any guidance is appreciated. Thanks!

build.gradle.kts reproducing the issue

import java.io.PrintWriter
import java.util.UUID

plugins {
    id("org.jetbrains.kotlin.multiplatform") version "2.0.0-Beta2"
    id("com.android.kotlin.multiplatform.library") version "8.4.0-alpha04"
}

val generateStaticResourceTask = tasks.register(
    "generateStaticResource",
    GenerateStaticResourceTask::class.java
) {
    content.set(UUID.randomUUID().toString())
    outputDir.set(layout.buildDirectory.dir("generated/example"))
}


kotlin {
    androidLibrary {
        namespace = "com.example.resourcerepro"
        compileSdk = 34
        dependencyVariantSelection { buildTypes.add("debug") }
        withAndroidTestOnJvmBuilder {}
        withAndroidTestOnDevice {}
    }
    jvm()
    sourceSets {
        jvmMain {
//          this works
//          resources.srcDir(generateStaticResourceTask.map { it.outputDir })
        }
        androidMain {
//          this does not
            resources.srcDir(generateStaticResourceTask.map { it.outputDir })
        }
    }
}

abstract class GenerateStaticResourceTask() : DefaultTask() {
    @get:Input
    abstract val content: Property<String>
    @get:OutputDirectory
    abstract val outputDir: DirectoryProperty

    @TaskAction()
    fun run() {
        val outputFile = File(outputDir.get().asFile, "example.txt")
        outputFile.parentFile.mkdirs()
        val writer = PrintWriter(outputFile)
        writer.println(content.get())
        writer.close()
    }
}

Task diff between the two versions

 :app:assemble
 +--- :app:allMetadataJar
 |    \--- :app:generateProjectStructureMetadata
 +--- :app:assembleAndroidMain
 |    \--- :app:bundleAndroidMainAar
 |         +--- :app:generateAndroidMainEmptyResourceFiles
 |         |    \--- :app:preAndroidMainBuild
 |         |         \--- :app:androidPreBuild
 |         +--- :app:preAndroidMainBuild *
 |         +--- :app:prepareLintJarForPublish
 |         +--- :app:processAndroidMainManifest
 |         |    \--- :app:preAndroidMainBuild *
 |         +--- :app:syncAndroidMainLibJars
 |         |    +--- :app:compileAndroidMain
 |         |    |    \--- :app:checkKotlinGradlePluginConfigurationErrors
 |         |    +--- :app:mergeAndroidMainJavaResource
 |         |    |    +--- :app:preAndroidMainBuild *
 |         |    |    \--- :app:processAndroidMainJavaRes
 |         |    |         \--- :app:preAndroidMainBuild *
 |         |    \--- :app:preAndroidMainBuild *
 |         \--- :app:writeAndroidMainAarMetadata
 |              \--- :app:preAndroidMainBuild *
 \--- :app:jvmJar
      +--- :app:compileKotlinJvm
      |    \--- :app:checkKotlinGradlePluginConfigurationErrors *
      +--- :app:jvmMainClasses
      |    +--- :app:compileKotlinJvm *
      |    \--- :app:jvmProcessResources
+     |         \--- :app:generateStaticResource
      \--- :app:jvmProcessResources *