old_contents: # A context carrying the loaded configuration.
  
  from libcloud.compute.types import Provider
  from libcloud.compute.providers import get_driver
  
  import config
  
  class ConfigContext(object):
      def __init__(self, config):
          self._config = config
  
          self._cloud_workstations = {}
          self._volumes_by_cws = {}
          self._build_indexes()
  
          # Only support GCE for now
          assert config.provider == 'GCE'
  
          ComputeEngine = get_driver(Provider.GCE)
          self._driver = ComputeEngine('', '', project=self._config.project)
  
      def _build_indexes(self):
          for cws in self._config.cloud_workstations:
              self._cloud_workstations[cws.name] = cws
              for v in cws.volumes:
                  self._volumes[(cws.name, v.name)] = v
  
      def driver(self):
          return self._driver
  
      def get_cws(self, cws_name):
          return self._cloud_workstations[cws_name]
  
      def get_volume(self, cws_name, volume_name):
          return self._volumes[(cws_name, volume_name)]
  
      def get_volumes(self, cws_name):
          # Returned volumes order is non-deterministic.  This will have
          # to do for now.
          volumes = []
          for (name, _), v in self._volumes.iteritems():
              if name == cws_name:
                  volumes.append(v)
          return volumes
  
new_contents: # A context carrying the loaded configuration.
  
  from libcloud.compute.types import Provider
  from libcloud.compute.providers import get_driver
  
  import config
  
  class ConfigContext(object):
      def __init__(self, config):
          self._config = config
  
          self._cloud_workstations = {}
          self._volumes = {}
          self._build_indexes()
  
          # Only support GCE for now
          assert config.provider == 'GCE'
  
          ComputeEngine = get_driver(Provider.GCE)
          self._driver = ComputeEngine('', '', project=self._config.project)
  
      def _build_indexes(self):
          for cws in self._config.cloud_workstations:
              self._cloud_workstations[cws.name] = cws
              for v in cws.volumes:
                  self._volumes[(cws.name, v.name)] = v
  
      def driver(self):
          return self._driver
  
      def get_cws(self, cws_name):
          return self._cloud_workstations[cws_name]
  
      def get_volume(self, cws_name, volume_name):
          return self._volumes[(cws_name, volume_name)]
  
      def get_volumes(self, cws_name):
          # Returned volumes order is non-deterministic.  This will have
          # to do for now.
          volumes = []
          for (name, _), v in self._volumes.iteritems():
              if name == cws_name:
                  volumes.append(v)
          return volumes
  
subject: Revert unintend change. Fixes bug.