Comment # 8 on bug 1231482 from Lukas Ocilka

From that referenced code:

        # setfiles doesn't come with a stable command API and older versions
        # needs a different invocation syntax. On older versions the usage
        # information explicitly lists "setfiles -c policyfile" which is not
        # present in newer versions. As setfiles doesn't come with a simple
        # --version option, checking for this extra element in the usage
        # was the only pointer I could come up with to differentiate the
        # call options.

I don't think this is "the right way" at all.

How I see it is that all this should be hidden from any installer. It's a
special action needed by the specific solution (SELinux).

And it's definitely not "An Installer Bug", it might be a feature request
though. But a feature request definitely needs a proper description.