def rootNode = "investigate"
def containerRunOptions = [
    "-v /var/run/docker.sock:/var/run/docker.sock",
   // well by default plugin runs with -u 1000:1000 flag which could break using docker inside container as given user won't have proper group access
    "-u 1000:docker"
].join(" ")

def prepareDockerEnvironment(){
    try {
        // wipe out old unused docker networks
        sh("docker network ls --filter name=jenkins -q | xargs docker network rm")
    }
    catch (error){
        echo "no previous jenkins networks found."
    }
    finally {
        // create isolated docker network for current run
        sh("docker network create --driver bridge jenkins-${env.BUILD_TAG}")
    }
}

// extends options with strict network binding, to get an access for services via standard
// names via name resolving
def opts(String options){
    return [options, "--net jenkins-${env.BUILD_TAG}"].join(" ")
}

node(rootNode){
    def pgImage = "postgres:9.4"
    def dockerEnv = docker.image("ci-image")  // replaced with fake image
    def postgresEnv = docker.image("postgres:9.4")

    stage("prepare environment"){
        sh 'ls -la'
        prepareDockerEnvironment()
    }

    dockerEnv.inside(opts(containerRunOptions)){
        stage("start services"){
            docker.image(pgImage).withRun(opts("--name database")){ pgContainer ->
                echo "${pgContainer.id}"
                sh 'ls -la '
                sh "nc -z database 5432"
            }
        }
    }
}