设置模板属性和使用环境变量

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# 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.

"""Creates the virtual machine."""

COMPUTE_URL_BASE = 'https://www.googleapis.com/compute/v1/'


def GenerateConfig(context):
  """Creates the virtual machine with environment variables."""

  resources = [{
      # `the-first-vm` is replaced with `context.env[`name`]`
      'name': context.env['name'],
      'type': 'compute.v1.instance',
      'properties': {
          # All occurrences of `us-central1-f` are replaced with
          # `context.properties[`zone`]. 
          # All occurrences of the project ID are replaced with 
          # `context.env[`project`]`.
          # `f1-micro` is replaced with `context.properties["machineType"].  
          'zone': context.properties['zone'],
          'machineType': ''.join([COMPUTE_URL_BASE, 'projects/',
                                  context.env['project'], '/zones/',
                                  context.properties['zone'], '/machineTypes/',
                                  context.properties['machineType']]),
          'disks': [{
              'deviceName': 'boot',
              'type': 'PERSISTENT',
              'boot': True,
              'autoDelete': True,
              'initializeParams': {
                  'sourceImage': ''.join([COMPUTE_URL_BASE, 'projects/',
                                          'debian-cloud/global/',
                                          'images/family/debian-11'])
              }
          }],
          # `$(ref.a-new-network.selfLink)` is replaced with 
          # `$(ref.` + context.properties[`network`] + `selfLink)`.
          'networkInterfaces': [{
              'network': '$(ref.' + context.properties['network']
                         + '.selfLink)',
              'accessConfigs': [{
                  'name': 'External NAT',
                  'type': 'ONE_TO_ONE_NAT'
              }]
          }]
      }
  }]
  return {'resources': resources}