def thumbnail_exists(self, thumbnail_name):
        if self.remote_source:
            return False

        if utils.is_storage_local(self.source_storage):
            source_modtime = utils.get_modified_time(
                self.source_storage, self.name)
        else:
            source = self.get_source_cache()
            if not source:
                return False
            source_modtime = source.modified

        if not source_modtime:
            return False

        local_thumbnails = utils.is_storage_local(self.thumbnail_storage)
        if local_thumbnails:
            thumbnail_modtime = utils.get_modified_time(
                self.thumbnail_storage, thumbnail_name)
            if not thumbnail_modtime:
                return False
            return source_modtime <= thumbnail_modtime

        thumbnail = self.get_thumbnail_cache(thumbnail_name)
        if not thumbnail:
            return False
        thumbnail_modtime = thumbnail.modified

        if thumbnail.modified and source_modtime <= thumbnail.modified:
            return thumbnail
        return False
Given the arch name, returns the directory where it will be
dataset/ETHPy150Open SmileyChris/easy-thumbnails/easy_thumbnails/files.py/Thumbnailer.thumbnail_exists--crossover with--dataset/ETHPy150Open kivy/python-for-android/pythonforandroid/recipe.py/Recipe.get_build_container_dir