Show the details of an existing disk.

    CLI Example:

    .. code-block:: bash

        salt-cloud -a show_disk myinstance disk_name=mydisk
        salt-cloud -f show_disk gce disk_name=mydisk

def show_disk(name=None, kwargs=None, call=None):  # pylint: disable=W0613
    '''
    Show the details of an existing disk.

    CLI Example:

    .. code-block:: bash

        salt-cloud -a show_disk myinstance disk_name=mydisk
        salt-cloud -f show_disk gce disk_name=mydisk
    '''
    if not kwargs or 'disk_name' not in kwargs:
        log.error(
            'Must specify disk_name.'
        )
        return False

    conn = get_conn()
    return _expand_disk(conn.ex_get_volume(kwargs['disk_name']))