Add a util that will help fix ubuntus network after openstack is cleared

tools/clear-net-ubuntu.sh

@@ -0,0 +1,38 @@
+#!/bin/bash -x
+
+ETH_SRC="eth0"
+
+echo "Clearing your network up."
+
+if [[ -n `brctl show  | grep -i br100` ]]
+then
+    echo "Clearing br100 and making $ETH_SRC be the real interface."
+    #sudo ifconfig $ETH_SRC down
+    #sudo ifconfig br100 down
+    #sudo brctl delif br100 $ETH_SRC
+    #sudo brctl delbr br100
+fi
+
+if [[ -n `brctl show  | grep -i virbr0` ]]
+then
+    echo "Removing virbr0"
+    sudo ifconfig virbr0 down
+    sudo brctl delbr virbr0
+fi
+
+if [[ -z `grep "iface $ETH_SRC" /etc/network/interfaces` ]]
+then
+
+    echo "Readjusting /etc/network/interfaces to have DHCP on for $ETH_SRC"
+    sudo cat > /etc/network/interfaces <<EOF
+    auto $ETH_SRC
+    iface $ETH_SRC inet dhcp
+EOF
+
+    cat /etc/network/interfaces
+fi
+
+echo "Bringing back up $ETH_SRC"
+sudo ifup $ETH_SRC
+
+