Add Vault#exists property

        """

        return Path("/dev/mapper") / self._name

    @property

    def exists(self) -> bool:

        return self.image.exists()

    def create(self, password: str, size_mb: int = 64) -> None:

        image_absolute = self.image.resolve()

        if image_absolute.exists():

        if self.exists:

            raise FileExistsError(

                f"{image_absolute} already exists, not overwriting it."

            )