#!/bin/bash

#DESC change nic namings from ethX to tfethX.

#Check for idrac
ifconfig > /tmp/ifconf.out
[ "`ifconfig | grep idrac`" != "" ] && mail -s "`hostname` - change_nics failed. idrac nic running." mgreen@teleflora.com,kpugh@teleflora.com,tshilling@teleflora.com < /tmp/ifconf.out && exit 1

#Check if already been done.
[ "`ifconfig | grep tfeth`" != "" ] && echo "change_nics already done....." && exit 1

#eth0
if [ -f /etc/sysconfig/network-scripts/ifcfg-eth0 ]
then
MACADDR0=`ifconfig eth0 | grep ether | cut -d" " -f10`
cat > /etc/udev/rules.d/10-persistent.rules << EOF
SUBSYSTEM=="net", ACTION=="add", DRIVERS=="?*", ATTR{address}=="$MACADDR0", ATTR{type}=="1", KERNEL=="*", NAME="tfeth0"
EOF
cp -f /etc/sysconfig/network-scripts/ifcfg-eth0 /tmp
sed -i 's/eth0/tfeth0/g' /etc/sysconfig/network-scripts/ifcfg-eth0
mv -f /etc/sysconfig/network-scripts/ifcfg-eth0 /etc/sysconfig/network-scripts/ifcfg-tfeth0
fi

#eth1
if [ -f /etc/sysconfig/network-scripts/ifcfg-eth1 ]
then
MACADDR1=`ifconfig eth1 | grep ether | cut -d" " -f10`
cat >> /etc/udev/rules.d/10-persistent.rules << EOF
SUBSYSTEM=="net", ACTION=="add", DRIVERS=="?*", ATTR{address}=="$MACADDR1", ATTR{type}=="1", KERNEL=="*", NAME="tfeth1"
EOF
cp -f /etc/sysconfig/network-scripts/ifcfg-eth1 /tmp
sed -i 's/eth1/tfeth1/g' /etc/sysconfig/network-scripts/ifcfg-eth1
mv -f /etc/sysconfig/network-scripts/ifcfg-eth1 /etc/sysconfig/network-scripts/ifcfg-tfeth1
fi

#add to dracut image so change will persist after kernel update.
if [ -f /etc/udev/rules.d/10-persistent.rules ]
then
mkdir -p /etc/dracut.conf.d
echo install_items+=\" /etc/udev/rules.d/10-persistent.rules \" > /etc/dracut.conf.d/include-nic-names-rules.conf
dracut -f
cp -f /etc/default/grub /tmp
sed -i 's/net.ifnames=0//g' /etc/default/grub
grub2-mkconfig -o /boot/grub2/grub.cfg
grub2-mkconfig -o /boot/efi/EFI/redhat/grub.cfg
fi

exit 0