#!/usr/bin/env bash

# This script is patching /usr/lib/python2.7/dist-packages/nova/network/linux_net.py
# More specifically it's adding '1' as recognized exit code
# it's WA and will work just when _setr_device_mtu will not change dramatically

# step1) get ROW for patching
FILE="/usr/lib/python2.7/dist-packages/nova/network/linux_net.py"

ROW=`grep -n "def _set_device_mtu(dev, mtu=None):" $FILE | cut -d ":" -f 1`

# step2) use sed for patching it

sed -i.bck "$((ROW+8))s/check_exit_code=\[0, 2, 254\]/check_exit_code=\[0, 1, 2, 254\]/" $FILE

diff $FILE $FILE.bck

if [ $? -eq 0 ]; then
  echo "WARNING: linux_net.py not patched, please check if it's really needed"
else
  echo "SUCCESS: linux_net.py patched"
fi