The man page says that --sign-kernel and --no-sign-kernel "override the detection of whether to sign the Linux binary", so we should only autodetect if neither are specified. But as of commit 02eabaffe98c ("ukify: Add a unified interface for signing tools"), we autodetect even when --no-sign-kernel is passed, which makes the flag useless. The sign_kernel option is parsed using argparse.BooleanOptionalAction, which sets it to either True, False, or None. commit 02eabaffe98c replaced `sign_kernel is None` with `not sign_kernel`. These are not the same in Python, as the latter accepts False as well as None. Restore the original check and fix type annotations accordingly. Fixes: 02eabaffe98c ("ukify: Add a unified interface for signing tools")
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