Comment 3 for bug 617725

I think it's obviously the right thing not to require people to do this kind of work by hand if at all possible, but I'm cautious about introducing a new interface for it. In particular, Debian already has code which automatically generates the configuration file if it's absent using '/usr/share/mdadm/mkconf generate /etc/mdadm/mdadm.conf', without requiring anything in the configuration file; this code was removed in Ubuntu as part of a general simplification when we moved to udev for RAID assembly. Maybe we just need to restore that little piece of complexity?