import subprocess
import tempfile
import shutil
from pathlib import Path


def fetch_file(repo_url: str, file_path: str, dest: Path):
    tmp = tempfile.mkdtemp()

    subprocess.check_call(["git", "clone", "--depth", "1", repo_url, tmp])

    src = Path(tmp) / file_path
    if not src.exists():
        raise FileNotFoundError(file_path)

    shutil.copy2(src, dest / src.name)