if no hostname was set, use IP for setting the hostname

otherwise the hostname is set to (none)

bin/fai

@@ -294,9 +294,19 @@ if [ $do_init_tasks -eq 1 ]; then
         esac
     done
     unset word
+    if [ -n "$HOSTNAME" ]; then
+	export hostname $HOSTNAME
+    fi
 
-    hostname $HOSTNAME
-    export HOSTNAME
+    # if the host name is still not set, use the IP for setting the hostname
+    hname=$(hostname)
+    if [ -z "$HOSTNAME" -o $HOSTNAME = '(none)' -o -z "$hname" ]; then
+	myip=$(ip ad show up | grep -w inet | cut -d t -f 2 | cut -d ' ' -f 2 | cut -d / -f 1 | grep -v 127.0.0.1| tr '.' '-')
+	export HOSTNAME="ip-$myip"
+	hostname $HOSTNAME
+	echo "Using IP for setting the host name: $hostname"
+    fi
+    unset hname myip
 
     renewclass=1 # always renew class list when installing
     mkdir -p /var/lib/discover /var/discover /etc/sysconfig