How to write a post-receive script for bit bucket

Copy#!/bin/bash
set -x #echo on

tag_push_trigger()
{    
    masterTag=$(git for-each-ref | grep $newrev | grep refs/heads/master )
    
    if [[ -z "$masterTag" ]]; then
      echo " Tag is not created for master branch "       
    else
      tag_create_zipfile  
    fi
}


tag_create_zipfile()
{
    export AWS_ACCESS_KEY_ID=xxxxxxxxxxxxxxxxxxxxxx
    export AWS_SECRET_ACCESS_KEY=xxxxxxxxxxxxxxxxxxxxxxxxxxxxx
    export AWS_DEFAULT_REGION=ap-southeast-2

    echo " create zip file of tag "
    # Get the latest tag
    tag=$(git describe --tags --abbrev=0)
    # Create a zip file out of the latest tag release
    # proDir="codepool"
    proDir="project"
    
    git archive $tag --format=zip --output="./$proDir.zip"
    # move the zip file to s3 bucket
    aws s3 cp "$proDir.zip" s3://nestarter-example-com-state-store
    rm "$proDir.zip"
}

uat_push_trigger()
{
    export AWS_ACCESS_KEY_ID=xxxxxxxxxxxxxxxxxxxxxx
    export AWS_SECRET_ACCESS_KEY=xxxxxxxxxxxxxxxxxxxxxxxxxxxxx
    export AWS_DEFAULT_REGION=ap-southeast-2

    echo " create zip file of tag "
    
    # Create a zip file out of the latest tag release
    # proDir="codepool"
    proDir="project"
    
    git archive release-UAT --format=zip --output="./$proDir.zip"
    # move the zip file to s3 bucket
    aws s3 cp "$proDir.zip" s3://xxxxxxxxxxxxxxxxxxxxxxxxxxxxx
    rm "$proDir.zip"
}

while read oldrev newrev ref
do
  echo "The new rev is $newrev "
  echo "The old rev is $oldrev "
  echo "The ref is $ref "

  if [[ "$ref" == refs/tags/* ]]; then
    tag_push_trigger $oldrev $newrev $ref    
  elif [[ "$ref" == refs/heads/release-UAT ]]; then
    uat_push_trigger
  else
    echo " Could not trigger deployment"
  fi            
	
done