Tool to diff kernel configs

diffconfig.py

def parse_config(raw):
    result = {}
    for line in raw.splitlines():
        if line.startswith("#"):
            continue
        if line.strip() == "":
            continue

        key, value = line.split("=", maxsplit=1)
        result[key] = value

    return result


def diff_configs(a, b):
    result = []
    config_a = parse_config(a)
    config_b = parse_config(b)
    for key, value in config_b.items():
        if key not in config_a:
            result.append("{}={}".format(key, value))
    return result


if __name__ == '__main__':
    import argparse

    parser = argparse.ArgumentParser(description="defconfig diff utility")
    parser.add_argument('config_a', type=open)
    parser.add_argument('config_b', type=open)
    parser.add_argument('--missing', help="List parameters from B that aren't set in A")
    args = parser.parse_args()

    with args.config_a:
        a = args.config_a.read()

    with args.config_b:
        b = args.config_b.read()

    diff = diff_configs(a, b)
    for line in diff:
        print(line)