old_contents: ##
  # Copyright (c) 2010 Apple 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.
  ##
  
  import sys
  from xml.etree import ElementTree
  from xml.etree import ElementPath
  
  def main():
      conf = ElementTree.parse(file(sys.argv[1]))
      if sys.argv[2] == 'postgresql':
          value = 'true'
      elif sys.argv[2] == 'filesystem':
          value = 'false'
      else:
          raise RuntimeError("Don't know what to do with %r" % (sys.argv[2],))
      replace(conf.getiterator(), value)
      conf.write(sys.stdout)
  
  
  def replace(elements, value):
      found = False
      for ele in elements:
          if found:
              ele.tag = value
              return
          if ele.tag == 'key' and ele.text == 'UseDatabase':
              found = True
      raise RuntimeError("Failed to find <key>UseDatabase</key>")
  
new_contents: ##
  # Copyright (c) 2010 Apple 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.
  ##
  
  """
  Generate a new calendar server configuration file based on an existing
  one, with a few values changed to satisfy requirements of the
  benchmarking tools.
  """
  
  import sys
  from xml.etree import ElementTree
  from xml.etree import ElementPath
  
  def main():
      conf = ElementTree.parse(file(sys.argv[1]))
      if sys.argv[2] == 'postgresql':
          value = 'true'
      elif sys.argv[2] == 'filesystem':
          value = 'false'
      else:
          raise RuntimeError("Don't know what to do with %r" % (sys.argv[2],))
  
      # Here are the config changes we make - use the specified backend
      replace(conf.getiterator(), 'UseDatabase', value)
      # - and disable the response cache
      replace(conf.getiterator(), 'EnableResponseCache', 'false')
      conf.write(sys.stdout)
  
  
  def replace(elements, key, value):
      found = False
      for ele in elements:
          if found:
              ele.tag = value
              return
          if ele.tag == 'key' and ele.text == key:
              found = True
      raise RuntimeError("Failed to find <key>UseDatabase</key>")
  
subject: Rewrite the config to disable the response cache, too.