check_xcode_version.py

#!/usr/bin/env python3

import argparse
import subprocess


def get_actual_version():
    return subprocess.run(
        ["xcodebuild", "-version"], check=True, capture_output=True, encoding="utf8"
    ).stdout.split("\n")[0]


def get_expected_version():
    with open(".xcode-version", "r") as file:
        return file.read().rstrip()


def without_patch_version(value):
    components = value.split(".")
    return ".".join(components[:2])


def main():
    parser = argparse.ArgumentParser()
    parser.add_argument(
        "--relaxed", action="store_true", help="ignore patch version when comparing"
    )
    ns = parser.parse_args()
    actual_version = get_actual_version()
    expected_version = get_expected_version()
    if ns.relaxed:
        actual_version = without_patch_version(actual_version)
        expected_version = without_patch_version(expected_version)
    if actual_version != expected_version:
        print(
            f"You’re using {actual_version} but you should be using {expected_version}."
        )
        exit(1)


if __name__ == "__main__":
    main()