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#!/usr/bin/python
# Copyright 2016 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.
"""A library used to set up the instance's default configurations file.
Note that the configurations in
/etc/default/instance_configs.cfg.template override the values set in
/etc/default/instance_configs.cfg. The system instance_configs.cfg may be
overridden during package upgrade.
"""
import os
from google_compute_engine import config_manager
from google_compute_engine.compat import parser
class InstanceConfig(config_manager.ConfigManager):
"""Creates a defaults config file for instance configuration."""
instance_config = '/etc/default/instance_configs.cfg'
instance_config_distro = '%s.distro' % instance_config
instance_config_template = '%s.template' % instance_config
instance_config_script = os.path.abspath(__file__)
instance_config_header = (
'This file is automatically created at boot time by the %s script. Do '
'not edit this file directly. If you need to add items to this file, '
'create or edit %s instead and then run '
'/usr/bin/google_instance_setup.')
instance_config_options = {
'Accounts': {
'deprovision_remove': 'false',
'groups': 'adm,dip,docker,lxd,plugdev,video',
},
'Daemons': {
'accounts_daemon': 'true',
'clock_skew_daemon': 'true',
'ip_forwarding_daemon': 'true',
},
'Instance': {
'instance_id': '0',
},
'InstanceSetup': {
'optimize_local_ssd': 'true',
'network_enabled': 'true',
'set_boto_config': 'true',
'set_host_keys': 'true',
'set_multiqueue': 'true',
},
'IpForwarding': {
'ethernet_proto_id': '66',
},
'MetadataScripts': {
'run_dir': '',
'startup': 'true',
'shutdown': 'true',
},
'NetworkInterfaces': {
'setup': 'true',
'dhclient_script': '/sbin/google-dhclient-script',
'dhcp_command': '',
},
}
def __init__(self):
"""Constructor.
Inherit from the ConfigManager class. Read the template for instance
defaults and write new sections and options. This prevents package
updates from overriding user set defaults.
"""
self.instance_config_header %= (
self.instance_config_script, self.instance_config_template)
# User provided instance configs should always take precedence.
super(InstanceConfig, self).__init__(
config_file=self.instance_config_template,
config_header=self.instance_config_header)
# Use the settings in an instance config file if one exists. If a config
# file does not already exist, try to use the distro provided defaults. If
# no file exists, use the default configuration settings.
config_files = [self.instance_config, self.instance_config_distro]
config_defaults = []
for config_file in config_files:
if os.path.exists(config_file):
config = parser.SafeConfigParser()
config.read(config_file)
config_defaults.append(
dict((s, dict(config.items(s))) for s in config.sections()))
config_defaults.append(self.instance_config_options)
for defaults in config_defaults:
for section, options in sorted(defaults.items()):
for option, value in sorted(options.items()):
super(InstanceConfig, self).SetOption(
section, option, value, overwrite=False)
def WriteConfig(self):
"""Write the config values to the instance defaults file."""
super(InstanceConfig, self).WriteConfig(config_file=self.instance_config)
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