def mkdir(self, dest):
        pass
ensure_vistrail returns the controller matching the locator if the
dataset/ETHPy150Open Yelp/mrjob/mrjob/fs/s3.py/S3Filesystem.mkdir--crossover with--dataset/ETHPy150Open VisTrails/VisTrails/vistrails/core/application.py/VistrailsApplicationInterface.ensure_vistrail