func (p *nasDatastoreMountProcessor) validateDatastore(ds *object.Datastore) error {
	if p.ds == nil {
		p.ds = ds
		return nil
	}
	expected := p.ds.Reference().Value
	actual := ds.Reference().Value
	if expected != actual {
		return fmt.Errorf("expected datastore ID to be %q, got %q", expected, actual)
	}
	return nil
}
func (p *nasDatastoreMountProcessor) validateDatastore(ds *object.Datastore) error {
	if p.ds == nil {
		p.ds = ds
		return nil
	}
	expected := p.ds.Reference().Value
	actual := ds.Reference().Value
	if expected != actual {
		return fmt.Errorf("expected datastore ID to be %q, got %q", expected, actual)
	}
	return nil
}
// validateDatastore does one of two things: either stores the current
// datastore in the processor, if it's missing, or validates the supplied
// datastore with the one currently in the processor by checking if their IDs
// match.