ahoy/scripts/auto_firmware_version.py

# SPDX-License-Identifier: GPL-2.0-or-later
#
# Copyright (C) 2022 Thomas Basler and others
#
import pkg_resources

Import("env")

required_pkgs = {'dulwich'}
installed_pkgs = {pkg.key for pkg in pkg_resources.working_set}
missing_pkgs = required_pkgs - installed_pkgs

if missing_pkgs:
    env.Execute('"$PYTHONEXE" -m pip install dulwich')

from dulwich import porcelain

def get_firmware_specifier_build_flag():
    try:
        build_version = porcelain.describe('../')  # refers to the repository root dir
    except:
        build_version = "g0000000"

    build_flag = "-D AUTO_GIT_HASH=\\\"" + build_version[1:] + "\\\""
    print ("Firmware Revision: " + build_version)
    return (build_flag)

env.Append(
    BUILD_FLAGS=[get_firmware_specifier_build_flag()]
)