from abc import ABC, abstractmethod
from pathlib import Path
from typing import Callable


class OverlayMounter(ABC):
    @abstractmethod
    def mount(
        self,
        *,
        lowerdirs: str,
        upperdir: Path,
        workdir: Path,
        merged: Path,
        on_stdout: Callable[[str], None] | None = None,
        on_stderr: Callable[[str], None] | None = None,
        passthrough: bool = False,
    ) -> None:
        raise NotImplementedError

    @abstractmethod
    def unmount(
        self,
        *,
        merged: Path,
        on_stdout: Callable[[str], None] | None = None,
        on_stderr: Callable[[str], None] | None = None,
        passthrough: bool = False,
    ) -> None:
        raise NotImplementedError