Re: [PATCH] Don't allow the rootfs on live installs to not match (#493206, #492727)

[Chris Lumens <clumens redhat com>]

> Tested now and it works and keeps people from getting into this situation...
> 
> Ensure that with live installs that the type of the rootfs matches what we
> need it to.  This used to be done behind the user's back in the livecd
> code, but it's probably better to handle more generally like this

I think this is fine for now, but I wonder if we should start following
what the comment in backend.py says and handle these special cases a
little more elegantly.  I can't think of anything off the top of my head
though.

- Chris