- handle rootprefix when reading fstab, crypttab and mdadm.conf

[aschnell]

Needed for https://github.com/yast/yast-in-container. Further changes are needed.

[ancorgs]

I hacked YaST like this yast/yast-storage-ng#1305 to give this a try.

I also had to install some additional packages in the container image like lvm2, e2fsprogs, btrfsprogs, xfsprogs, cryptsetup, etc.

It almost worked. Probing looked fine but it failed during the commit phase very likely because all calls to udevadm settle resulted in:

Running in chroot, ignoring request.

I'm attaching the full logs in case they are useful:

y2logs-failed.txt

[aschnell]

I also did some tests and LVM seems to have a problem with the setup: The device nodes for logical volumes does not appear (could be a problem of udev).

Another problem I noticed is that mounting a file system in the container works but of course it is not mounted in the host as the user would expect.