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#!/usr/bin/python
# Copyright 2018 Google Inc. All Rights Reserved.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
"""Utilities that are distro specific for use on EL 7."""
import fileinput
import os
import re
from google_compute_engine import constants
from google_compute_engine.distro_lib import helpers
from google_compute_engine.distro_lib import ip_forwarding_utils
from google_compute_engine.distro_lib import utils
class Utils(utils.Utils):
"""Utilities used by Linux guest services on EL 7."""
network_path = constants.LOCALBASE + '/etc/sysconfig/network-scripts'
def EnableIpv6(self, interfaces, logger, dhclient_script=None):
"""Configure the network interfaces for IPv6 using dhclient.
Args:
interface: string, the output device names for enabling IPv6.
logger: logger object, used to write to SysLog and serial port.
dhclient_script: string, the path to a dhclient script used by dhclient.
"""
helpers.CallDhclientIpv6(interfaces, logger)
def EnableNetworkInterfaces(self, interfaces, logger, dhclient_script=None):
"""Enable the list of network interfaces.
Args:
interfaces: list of string, the output device names to enable.
logger: logger object, used to write to SysLog and serial port.
dhclient_script: string, the path to a dhclient script used by dhclient.
"""
# Should always exist in EL 7.
if os.path.exists(self.network_path):
self._DisableNetworkManager(interfaces, logger)
helpers.CallDhclient(interfaces, logger)
def _DisableNetworkManager(self, interfaces, logger):
"""Disable network manager management on a list of network interfaces.
Args:
interfaces: list of string, the output device names enable.
logger: logger object, used to write to SysLog and serial port.
"""
for interface in interfaces:
interface_config = os.path.join(
self.network_path, 'ifcfg-%s' % interface)
if os.path.exists(interface_config):
self._ModifyInterface(
interface_config, 'DEVICE', interface, replace=False)
self._ModifyInterface(
interface_config, 'NM_CONTROLLED', 'no', replace=True)
else:
with open(interface_config, 'w') as interface_file:
interface_content = [
'# Added by Google.',
'BOOTPROTO=none',
'DEFROUTE=no',
'DEVICE=%s' % interface,
'IPV6INIT=no',
'NM_CONTROLLED=no',
'NOZEROCONF=yes',
'',
]
interface_file.write('\n'.join(interface_content))
logger.info('Created config file for interface %s.', interface)
def _ModifyInterface(
self, interface_config, config_key, config_value, replace=False):
"""Write a value to a config file if not already present.
Args:
interface_config: string, the path to a config file.
config_key: string, the configuration key to set.
config_value: string, the value to set for the configuration key.
replace: bool, replace the configuration option if already present.
"""
config_entry = '%s=%s' % (config_key, config_value)
if not open(interface_config).read().count(config_key):
with open(interface_config, 'a') as config:
config.write('%s\n' % config_entry)
elif replace:
for line in fileinput.input(interface_config, inplace=True):
print(re.sub(r'%s=.*' % config_key, config_entry, line.rstrip()))
def HandleClockSync(self, logger):
"""Sync the software clock with the hypervisor clock.
Args:
logger: logger object, used to write to SysLog and serial port.
"""
helpers.CallHwclock(logger)
def IpForwardingUtils(self, logger, proto_id=None):
"""Get system IP address configuration utilities.
Args:
logger: logger object, used to write to SysLog and serial port.
proto_id: string, the routing protocol identifier for Google IP changes.
"""
return ip_forwarding_utils.IpForwardingUtilsIproute(logger, proto_id)
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