def import_db(filename=None):
    """
    Imports the database.

    Make sure that you have this in your ``~/.pgpass`` file:

    localhost:5433:*:publishizer_publishizer:publishizer

    Also make sure that the file has ``chmod 0600 .pgpass``.

    Usage::

        fab import_db
        fab import_db:filename=foobar.dump

    """
    local_machine()
    if not filename:
        filename = settings.DB_DUMP_FILENAME
    with fab_settings(warn_only=True):
        local('pg_restore -O -c -U {0}{1} -d {2} {3}'.format(
            env.db_role, HOST, env.db_name, filename))