Git post-checkout hook to install CocoaPods

post-checkout.sh

#!/bin/bash
#
### CocoaPods git-checkout hook
#
# This is a hook which you can install, it will automatically
# run `pod install` when you do a git pull/clone/checkout.
#
# The hook can be used to make CocoaPods usable with Xcode CI.
#
## Installation
#
# This git post-checkout hook can be installed by running the
# following command. Note, you will need to re-install this
# everytime you update Xcode.
#
# $ [sudo] curl -o /Applications/Xcode.app/Contents/Developer/usr/share/git-core/templates/hooks/post-checkout https://gist.github.com/kylef/7250271/raw/post-checkout.sh
# $ [sudo] chmod +x /Applications/Xcode.app/Contents/Developer/usr/share/git-core/templates/hooks/post-checkout
#

if [ -r Podfile ] ; then
  env -i HOME=/Library/Server/Xcode PATH=$PATH pod install
fi