containers/build.gradle

import com.bmuschko.gradle.docker.tasks.image.*

plugins {
    id 'com.bmuschko.docker-remote-api'
    id "de.undercouch.download" version "4.1.0"
}

docker {
    registryCredentials {
        url = "${-> configureKubernetes.ext.dockerRegistry.toString()}/v2/"
    }
}

class BuildDockerConfig extends Copy {

}

tasks.register("download40", Download) {
    //src 'http://apache.mirrors.hoobly.com/cassandra/4.0-alpha4/apache-cassandra-4.0-alpha4-bin.tar.gz'
    src 'https://downloads.apache.org/cassandra/4.0-beta1/apache-cassandra-4.0-beta1-bin.tar.gz'
    dest "$buildDir/cassandra40/apache-cassandra-4.0-beta1-bin.tar.gz"
    overwrite false
}

tasks.register("cassandra40", BuildDockerConfig) {
    from("src/Cassandra40") {
    }

    from("src") {
        include "docker-entrypoint.sh"
        include "optimize-memory.sh"
    }

    into "$buildDir/cassandra40/"
    dependsOn download40

}

tasks.register("generateDockerConfigs") {
    doFirst {
        mkdir "build"
    }
    dependsOn tasks.withType(BuildDockerConfig)
}

def getRemoteTag(name) {
    return "${configureKubernetes.ext.dockerRegistryWithoutProtocol}/${configureKubernetes.ext.dockerGroup}/${name}:${configureKubernetes.ext.dockerTag}".toString()
}

tasks.register("buildImageCassandra40", DockerBuildImage) {
    // the toString is required here, otherwise we get org.codehaus.groovy.runtime.GStringImpl cannot be cast to java.lang.String
    def name = "cassandra40"
    def localTag = "${name}:${configureKubernetes.ext.dockerTag}".toString()

    // there might not be a group
    def remoteTag = getRemoteTag(name)
    // tag the private repo
    tags = [localTag, remoteTag]
    inputDir = file("$buildDir/${name}")
    dependsOn "cassandra40"
}

tasks.register("publishCassandra40", DockerPushImage) {
    def name = "cassandra40"
    imageName = "${configureKubernetes.ext.dockerRegistryWithoutProtocol}/${configureKubernetes.ext.dockerGroup}/${name}"

    dependsOn buildImageCassandra40
}

tasks.register("buildAll") {
    dependsOn tasks.withType(DockerBuildImage)
}
tasks.register("pushAll") {
    dependsOn tasks.withType(DockerPushImage)
    dependsOn "buildAll"
}