pg_gw_utils.py 文件源码

def get_cidr_from_iface(interface):
    '''
    Determines Network CIDR from interface.
    '''
    if not interface:
        return None
    apt_install('ohai')
    try:
        os_info = subprocess.check_output(['ohai', '-l', 'fatal'])
    except OSError:
        log('Unable to get operating system information')
        return None
    try:
        os_info_json = json.loads(os_info)
    except ValueError:
        log('Unable to determine network')
        return None
    device = os_info_json['network']['interfaces'].get(interface)
    if device is not None:
        if device.get('routes'):
            routes = device['routes']
            for net in routes:
                if 'scope' in net:
                    return net.get('destination')
        else:
            return None
    else:
        return None