My site.pp

site.pp

node default {
  tag("deployment::$deployment")
  include truth::enforcer

  case $operatingsystem {
    "Ubuntu":  { include os::ubuntu }
    default: { err("Unsupported operatingsystem: '$operatingsystem'") }
  }

  exec {
    "apt refresh":
      command => "apt-get -qq update";
  }
}