original_docstring: Determines the VSS store identifiers.
  
      Args:
        scan_context: the scan context (instance of dfvfs.ScanContext).
        vss_stores: Optional list of preferred VSS stored identifiers. The
                    default is None.
  
      Raises:
        SourceScannerError: if the format of or within the source
                            is not supported or the the scan context
                            is invalid.
      
docstring: Determines the VSS store identifiers.
docstring_tokens: Determines the VSS store identifiers .
code: def _GetVolumeVssStoreIdentifiers(self, scan_context, vss_stores=None):
      """Determines the VSS store identifiers.
  
      Args:
        scan_context: the scan context (instance of dfvfs.ScanContext).
        vss_stores: Optional list of preferred VSS stored identifiers. The
                    default is None.
  
      Raises:
        SourceScannerError: if the format of or within the source
                            is not supported or the the scan context
                            is invalid.
      """
      if (not scan_context or not scan_context.last_scan_node or
          not scan_context.last_scan_node.path_spec):
        raise errors.SourceScannerError(u'Invalid scan context.')
  
      volume_system = vshadow_volume_system.VShadowVolumeSystem()
      volume_system.Open(scan_context.last_scan_node.path_spec)
  
      volume_identifiers = self._source_scanner.GetVolumeIdentifiers(
          volume_system)
      if not volume_identifiers:
        return
  
      try:
        self._vss_stores = self._GetVssStoreIdentifiersFromUser(
            volume_system, volume_identifiers, vss_stores=vss_stores)
      except KeyboardInterrupt:
        raise errors.SourceScannerError(u'File system scan aborted.')
  
      return
code_tokens: def _GetVolumeVssStoreIdentifiers ( self , scan_context , vss_stores = None ) : if ( not scan_context or not scan_context . last_scan_node or not scan_context . last_scan_node . path_spec ) : raise errors . SourceScannerError ( u'Invalid scan context.' ) volume_system = vshadow_volume_system . VShadowVolumeSystem ( ) volume_system . Open ( scan_context . last_scan_node . path_spec ) volume_identifiers = self . _source_scanner . GetVolumeIdentifiers ( volume_system ) if not volume_identifiers : return try : self . _vss_stores = self . _GetVssStoreIdentifiersFromUser ( volume_system , volume_identifiers , vss_stores = vss_stores ) except KeyboardInterrupt : raise errors . SourceScannerError ( u'File system scan aborted.' ) return
short_docstring: Determines the VSS store identifiers.
short_docstring_tokens: Determines the VSS store identifiers .
comment: """Determines the VSS store identifiers.
  
      Args:
        scan_context: the scan context (instance of dfvfs.ScanContext).
        vss_stores: Optional list of preferred VSS stored identifiers. The
                    default is None.
  
      Raises:
        SourceScannerError: if the format of or within the source
                            is not supported or the the scan context
                            is invalid.
      """