Hi,

Attached is a patch for "fake" root functionality,
I'm (mostly) duplicating issue's description from my previous e-mail
(for commit message if this is to be pushed):

===============
fakeroot use case -
* initramfs includes ext3 filesystem wrapped into squashfs (like
ovirt-node-image has)
* that filesystem is used as a live root (initramfs is pulled from TFTP)
* kernel cmdline has CLIENTSTATE variable set to address of NFS mount.
Then rc.sysinit will mount $CLIENTSTATE/$HOSTNAME (as a last resort
case) and will use it as a STATE_MOUNT.

Thus, we have read-only root in RAM and all state files mounted from
NFS. So server can operate totally diskless (opposed to ovirt-node which
has to be set-up on a local disk or iSCSI target, both of which seem to
be an overkill if one has 16+ servers). An adding new servers to a pool
requires only correct DHCP server settings, nothing more (probably some
files on a nfs server too, but that's another story).

What we need from dracut is to set up networking and pass ifcfg's to a
system via /dev/.initramfs (for DHCP). But then we need to some-how
"simulate" networked root because otherwise there is no chance to bring
network up.

To achieve this we could pass "netroot=fake root=live:blablabla
CLIENTSTATE=xxx.yyy.zzz.www:/mnt" via kernel's cmdline.
==============

Best,
Vladislav