#!/usr/bin/env python3
"""Apply the FDS-owned layout to a new, empty image staging directory."""
import json
import pathlib
import sys

root = pathlib.Path(sys.argv[1])
layout = json.loads(pathlib.Path(sys.argv[2]).read_text())
if any(root.iterdir()):
    sys.exit("ERROR: layout must be applied to an empty root")
for path, mode in layout["directories"].items():
    target = root / path
    target.mkdir(parents=True, exist_ok=True)
    target.chmod(int(mode, 8))
for path, target in layout["symlinks"].items():
    (root / path).symlink_to(target)