tools: hv: Add clean up function for Ubuntu config

This patch adds a function to clean up duplicate config info
on Ubuntu.

Signed-off-by: Haiyang Zhang <haiyangz@microsoft.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

tools/hv/bondvf.sh

@@ -101,9 +101,25 @@ function create_bond_cfg_redhat {
 	echo BONDING_OPTS=\"mode=active-backup miimon=100 primary=$2\" >>$fn
 }
 
+function del_eth_cfg_ubuntu {
+	local fn=$cfgdir/interfaces
+	local tmpfl=$(mktemp)
+
+	local nic_start='^[ \t]*(auto|iface|mapping|allow-.*)[ \t]+'$1
+	local nic_end='^[ \t]*(auto|iface|mapping|allow-.*|source)'
+
+	awk "/$nic_end/{x=0} x{next} /$nic_start/{x=1;next} 1"  $fn >$tmpfl
+
+	cp $tmpfl $fn
+
+	rm $tmpfl
+}
+
 function create_eth_cfg_ubuntu {
 	local fn=$cfgdir/interfaces
 
+	del_eth_cfg_ubuntu $1
+
 	echo $'\n'auto $1 >>$fn
 	echo iface $1 inet manual >>$fn
 	echo bond-master $2 >>$fn
@@ -119,6 +135,8 @@ function create_eth_cfg_pri_ubuntu {
 function create_bond_cfg_ubuntu {
 	local fn=$cfgdir/interfaces
 
+	del_eth_cfg_ubuntu $1
+
 	echo $'\n'auto $1 >>$fn
 	echo iface $1 inet dhcp >>$fn
 	echo bond-mode active-backup >>$fn