Fabric subroutine for prepping debconf

system.py

def debconf(package, key, value, type_='string', key_prefix=None):
    """
    Seeds the debconf database with given values.
    
    Take the following example::

        debconf(
            package='mysql-server',
            key='root_password',
            type_='password',
            value='secret'
        )

    The above is equivalent to the following debconf seed line::

        mysql-server mysql-server/root_password password secret

    and results in that string being `sudo` echo'd into
    `debconf-set-selections`.

    By default, the package name is used as the prefix to the key; to
    explicitly override this, set ``key_prefix``.

    The default ``type_`` is `'string'`, which may also be overridden.
    """
    return sudo("echo \"%s %s %s %s\" | debconf-set-selections" % (
        package,
        (key_prefix and key_prefix or package) + '/' + key,
        type_,
        value
    ))