class Concourse

def ensure_docker_compose_file
  return if File.exist?(docker_compose_path)
  note "fetching docker compose file ..."
  File.open(docker_compose_path, "w") do |f|
    f.write URI.open("https://concourse-ci.org/docker-compose.yml").read
    sh "docker pull concourse/concourse"
  end
end