Capture collection fingerprints

build.gradle.kts

val libraryFingerprint by tasks.registering(LibraryFingerprint::class) {
    inputFiles.from(sourceSets["main"].output)
}

tasks.named("build").configure {
    dependsOn(libraryFingerprint)
}

abstract class LibraryFingerprint : DefaultTask() {

    @get:Inject
    abstract val fingerprinter: org.gradle.internal.fingerprint.classpath.ClasspathFingerprinter

    @get:Inject
    abstract val objectFactory: ObjectFactory

    @get:InputFiles
    @get:Classpath
    abstract val inputFiles: ConfigurableFileCollection

    @TaskAction
    fun execute() {
        inputFiles.asFileTree.forEach { file ->
            println("${file.name} = ${fingerprinter.fingerprint(objectFactory.fileCollection().from(file)).hash}")
        }
    }
}