"""Overlay copy handling."""

from __future__ import annotations

import os
import shutil


def copy_overlay(src: str, dest_root: str) -> None:
    if not src or not os.path.isdir(src):
        return

    for entry in os.listdir(src):
        src_path = os.path.join(src, entry)
        dest_path = os.path.join(dest_root, entry)
        if os.path.isdir(src_path):
            shutil.copytree(src_path, dest_path, symlinks=True, dirs_exist_ok=True)
        else:
            os.makedirs(os.path.dirname(dest_path), exist_ok=True)
            shutil.copy2(src_path, dest_path, follow_symlinks=True)