Tag New Package Release on Travis Build

tag-release.sh

#!/bin/bash
# This script will create a git-tag if version in package.json changes

git config --global user.email "builds@travis-ci.com"
git config --global user.name "Travis CI"

VERSION=$(node -pe "require('./package.json').version")
export PACKAGE_VERSION="v${VERSION}"
export LAST_TAG=$(git tag --sort version:refname | tail -1)

echo "Package version is:" $PACKAGE_VERSION
echo "Last tag is:" $LAST_TAG

if [ $PACKAGE_VERSION != $LAST_TAG ]
then
  echo Tagging release...
  git tag $PACKAGE_VERSION -a -m "Generated tag from TravisCI for build $TRAVIS_BUILD_NUMBER"
  git push --tags
fi