docker-zulip/includes/zulip/manifests/postgres_common.pp

class zulip::postgres_common {
  $postgres_packages = [# The database itself
                        "postgresql-9.3",
                        # Python modules used in our monitoring/worker threads
                        "python-gevent",
                        "python-tz",
                        "python-dateutil",
                        # our dictionary
                        "hunspell-en-us",
                        ]
  define safepackage ( $ensure = present ) {
    if !defined(Package[$title]) {
      package { $title: ensure => $ensure }
    }
  }
  safepackage { $postgres_packages: ensure => "installed" }
}