old_contents: # Copyright 2013 Daniel Narvaez
  #
  # 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 os
  
  
  def start(rcfile):
      bash_path = "/bin/bash"
      os.execlp(bash_path, bash_path, "--rcfile", rcfile)
  
new_contents: # Copyright 2013 Daniel Narvaez
  #
  # 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 os
  
  
  def start(rcfile):
      os.environ["OSBUILD_SHELL"] = "yes"
  
      args = ["/bin/bash", "--rcfile", rcfile]
      os.execlp(args[0], *args)
  
subject: Set an OSBUILD_SHELL variable