Deploy git repo contents when pushed based on pushed branch

gistfile1.sh

#!/bin/sh 

# POST-RECEIVE HOOK (copy to repo.git/hooks/post-receive)
#
# Deploy content of this repo to different working dirs
# based on the branch being pushed. Pushing to 'staging'
# checks out your contents to the path at $staging_path,
# and similar for the branch 'live' to $production_path.
#
# When copying this hook, modify the following variables
# but leave the remaining bit untouched. You can comment
# out any of the path variables that you might not need.

production_path=/path/to/live/webroot
staging_path=/path/to/staging/webroot


# -------------- Do not modify from this point ---------------

# Read stdin three times to populate these variables.
# We mainly care about the third one: the reference name
# of the commit that was just received.

while read oldrev newrev refname; do

  # Extract the branchname by querying git about this refname
  branch=$(git rev-parse --symbolic --abbrev-ref $refname)

  # On master branch, do nothing
  if [ "$branch" == "master" ]; then
    echo "Master branch received. No deployment was triggered"
  fi

  # On 'staging' branch, check out to staging folder
  if [ "$branch" == "staging" ]; then
    echo "STAGING received."
    if [ -z "$staging_path" ]; then
      echo "No staging path set. Nothing deployed."
    else
      echo "Checking out files to $staging_path"
      GIT_WORK_TREE=$staging_path    git checkout staging -f
    fi
  fi

  # On 'live' branch, check out to production folder
  if [ "$branch" == "live" ]; then
    echo "LIVE received."
    if [ -z "$production_path" ]; then
      echo "No live path set, nothing deployed"
    else
      echo "Checking out files to $production_path"
      GIT_WORK_TREE=$production_path    git checkout live -f
    fi
  fi
  
done