Python `get git root` function, for build scripts

githelpers.py

import subprocess


def get_root() -> str:
    """Return the current project root.

    A lot of scripts written for build system need to know where they are
    relative to a project's root.  This function returns the root folder, giving
    developers a concrete starting location for all file manipulation.
    """
    root = subprocess.check_output(["git", "rev-parse", "--show-toplevel"])
    if not root:
        raise OSError(2, "file not found (no git root detected)")
    return root.splitlines().pop().decode("utf-8")