text: class StoreError(RuntimeError):
      pass
  
  
  class CredentialsNotFound(StoreError):
      pass
  
  
  def process_store_error(cpe, program):
      message = cpe.output.decode('utf-8')
      if 'credentials not found in native keychain' in message:
          return CredentialsNotFound(
              'No matching credentials in {0}'.format(
                  program
              )
          )
      return StoreError(
          'Credentials store {0} exited with "{1}".'.format(
              program, cpe.output.decode('utf-8').strip()
          )
      )
  