Comment # 18 on bug 1003872 from Marius Tomaschewski

JFYI:
/var/lib/wicked/lease-eth0-dhcp-ipv4.xml is the lease used by wickedd-dhcp4.
On lease changes, wickedd-dhcp4 sends it to wickedd, which dumps it into a
/var/run/wicked/leaseinfo.eth0.dhcp.ipv4 file formatted for netconfig (plus
a batch file so it can perform multiple lease modify/remove at once) and
calls /etc/wicked/extensions/netconfig script calling /sbin/netconfig to
let netconfig apply it in the system. A "netconfig update" maybe called later
is not using /var/run/wicked/*, but /var/run/netconfig/*/netconfig* files,
that is the last settings applied via "netconfig modify"/"netconfig remove"
to write /etc/resolv.conf or other files in the system.

As alternative to copy /etc/resolv.conf (file or link + file points to)
and perhaps yp.conf and other things to the chroot, the nfsroot can be
also prepared by copying the /var/run/wicked/lease* files into the nfs
root + call of:

for leasinfo in /var/run/wicked/leaseinfo.* ; do 
        test "$leasinfo" = "/var/run/wicked/leaseinfo.*" && continue
        suffix=${leasinfo##*/leaseinfo.} 
        family=${suffix##*.} 
        suffix=${suffix%.*} 
        type=${suffix##*.} 
        ifname=${suffix%.*} 
        test "$ifname" = X -o "X$type" = X -o "X$family" = X && continue
        /sbin/netconfig modify -i "$ifname" -s "wicked-$type-$family" <
"$leasinfo"
done    

You can also limit it to dns settings only adding "-m dns" parameter.