def Open(self, path_spec):
    self._file_system = resolver.Resolver.OpenFileSystem(path_spec)
    if self._file_system is None:
      raise errors.VolumeSystemError(
          u'Unable to resolve file system from path specification.')

    type_indicator = self._file_system.type_indicator
    if type_indicator != definitions.TYPE_INDICATOR_TSK_PARTITION:
      raise errors.VolumeSystemError(u'Unsupported file system type.')
Test that creation short-circuits to reuse existing references
dataset/ETHPy150Open log2timeline/dfvfs/dfvfs/volume/tsk_volume_system.py/TSKVolumeSystem.Open--crossover with--dataset/ETHPy150Open ARM-software/workload-automation/wlauto/external/louie/test/test_saferef.py/TestSaferef.test_ShortCircuit