This script disables certain yum repos when disconnected from a VPN

99-vpn.sh

#!/bin/bash

# This script will disable/enable yum repos when something happens to your VPN
# The first thing you will need to do is make copies of the repos you want to swap
# Modify the settings appropriately and set up symlinks for your current status
# Place this script in /etc/NetworkManager/dispatcher.d, chown to root, and chmod u+x
#
# RTFM: http://linux.die.net/man/8/networkmanager
# Inspired by http://www.techytalk.info/start-script-on-network-manager-successfull-connection/

IF=$1
STATUS=$2

function modify(){
  status=$1
  pushd /etc/yum.repos.d > /dev/null

  # Find any files like foo.repo.down 
  for repo in *.$status
  do
    target=$(echo "$repo" | sed "s/\.$status\$//")
    ln -sf $target.$status $target
  done

  popd > /dev/null
}

if [ "$IF" == "tun0" ]
then
  case "$2" in
    vpn-up)
      logger -s "VPN up"
      modify "up"
      ;;
    vpn-down)
      logger -s "VPN down"
      modify "down"
      ;;
  esac
fi