Add a dhcphostname option to grml which will set the hostname of the
booted system according to the dns information.

This Patch takes care of the netboot case.

diffstat dhcphostname-ts.patch 
 scripts/live      |    5 +++++
 grml/23networking |   13 +++++++++++++
 2 files changed, 18 insertions(+)

signed-off-by: Andreas Thienemann <andreas@bawue.net>

--- a/grml/23networking	2009-06-02 11:57:00.156614733 +0200
+++ b/grml/23networking	2009-06-02 12:00:04.623804092 +0200
@@ -140,6 +140,19 @@ ${rc_server1}
 EOF
 
 			cat /root/etc/resolv.conf >> /root/var/log/netboot.config
+
+			if [ -n "$DHCPHOSTNAME" ]
+			then
+				dhcp_address=$(cat netboot.config | awk '/address:/{print $2}')
+				dhcp_hostname=$(busybox nslookup ${dhcp_address} ${rc_server0#nameserver }| awk \
+					'/Address 1: '${dhcp_address}'/{ print $4 }')
+
+				if [ -n "$dhcp_hostname" ]
+				then
+					echo $dhcp_hostname > /root/etc/hostname
+				fi
+				unset dhcp_address dhcp_hostname dhcp_hostname
+			fi
 		fi
 	fi
 fi
--- a/scripts/live	2009-06-02 11:59:15.689528261 +0200
+++ b/scripts/live	2009-06-02 01:18:42.617514858 +0200
@@ -59,6 +59,11 @@ Arguments ()
 				export DEFCONSOLE
 				;;
 
+			dhcphostname)
+				DHCPHOSTNAME="Yes"
+				export DHCPHOSTNAME
+				;;
+
 			debug)
 				DEBUG="Yes"
 				export DEBUG