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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 system boto.cfg file.
If a project ID is not provided, this request the project ID from the
metadata server and install the compute authentication plugin.
Note the config starts with the content in /etc/boto.cfg.template,
overrides settings, and then persists it into /etc/boto.cfg. This
is done so that the system boto.cfg can be removed prior to image
packaging.
"""
import os
from google_compute_engine import config_manager
from google_compute_engine import constants
from google_compute_engine import logger
from google_compute_engine import metadata_watcher
class BotoConfig(object):
"""Creates a boto config file for standalone GSUtil."""
# WARNING: The path should remain as /etc/boto.cfg in order to not break
# tools, such as gsutil, that rely on loading well-known Boto config paths.
# If you want to change this, please consult the gsutil team
# (GoogleCloudPlatform/gsutil) first.
boto_config = constants.BOTOCONFDIR + '/etc/boto.cfg'
boto_config_template = constants.BOTOCONFDIR + '/etc/boto.cfg.template'
boto_config_script = os.path.abspath(__file__)
boto_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 re-run google_instance_setup.')
def __init__(self, project_id=None, debug=False):
"""Constructor.
Args:
project_id: string, the project ID to use in the config file.
debug: bool, True if debug output should write to the console.
"""
self.logger = logger.Logger(name='boto-setup', debug=debug)
self.watcher = metadata_watcher.MetadataWatcher(logger=self.logger)
self._CreateConfig(project_id)
def _GetNumericProjectId(self):
"""Get the numeric project ID for this VM.
Returns:
string, the numeric project ID if one is found.
"""
project_id = 'project/numeric-project-id'
return self.watcher.GetMetadata(metadata_key=project_id, recursive=False)
def _CreateConfig(self, project_id):
"""Create the boto config to support standalone GSUtil.
Args:
project_id: string, the project ID to use in the config file.
"""
project_id = project_id or self._GetNumericProjectId()
# Our project doesn't support service accounts.
if not project_id:
return
self.boto_config_header %= (
self.boto_config_script, self.boto_config_template)
config = config_manager.ConfigManager(
config_file=self.boto_config_template,
config_header=self.boto_config_header)
# WARNING: If you want to change the contents of this config file, please
# consult the gsutil team (GoogleCloudPlatform/gsutil) first.
config.SetOption('GSUtil', 'default_project_id', project_id)
config.SetOption('GSUtil', 'default_api_version', '2')
config.SetOption('GoogleCompute', 'service_account', 'default')
config.WriteConfig(config_file=self.boto_config)
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