Comment # 8 on bug 994322 from Olaf Hering

(In reply to Steffen Winterfeldt from comment #4)
> I've hacked a proof of concept:
> 
> https://github.com/openSUSE/perl-bootloader/pull/105

This seems to rely on df output. Does df return an usable device name, never
things like "by-*/*-partN"? Would a stat + mknod be more reliable?

Looks like install() will always set installed even if grub2-install fails.