One click deploy and rollback From shell

Heres how I auto deploy my app, and how i roll back if something goes wrong.

sh scripts/deploy.sh deploy
sh scripts/deploy.sh deploy rollback

It couldnt be easier.

#!/bin/bash

TARGET=example.com
TARGET_BASE=/var/www/p
TARGET_ARCHIVE=$TARGET_BASE/analyse.tgz
TARGET_LOCATION=$TARGET_BASE/analyse

case "$1" in
 deploy)
  echo "building"
  yeoman build
  if [ ! -d dist ];
  then
   echo "yeoman didnt build"
   exit 1
  fi
  cd dist
  tar -czf ../dist.tgz *
  cd ..

  echo "backing up"
  ssh $TARGET << EOF
   if [ -f $TARGET_ARCHIVE ];
   then
    mv $TARGET_ARCHIVE $TARGET_ARCHIVE.1
   fi
EOF

  echo "deploying"
  scp dist.tgz $TARGET:$TARGET_ARCHIVE

  ssh $TARGET << EOF
   echo "cleaning old deployment"
   rm -rf $TARGET_LOCATION/*

   echo "extracting new build"

   if [ -f $TARGET_LOCATION ];
   then
    mkdir $TARGET_LOCATION
   fi
   tar xfz $TARGET_ARCHIVE -C $TARGET_LOCATION
EOF

  ;;
 rollback)
  echo "rolling back"
  
  ssh $TARGET << EOF
   rm -rf $TARGET_LOCATION/*

   mv $TARGET_ARCHIVE.1 $TARGET_ARCHIVE
   tar xfz $TARGET_ARCHIVE -C $TARGET_LOCATION

EOF
  ;;
 *)
  echo "usage: $0 [deploy] [rollback]"
  ;;
esac
exit 0