Creating docker container script from phusion ? 2016...?

docker.sh

# example multistage process docker build script from https://blog.phusion.nl/2016/08/31/efficiently-and-conveniently-building-ruby-and-node-js-application-docker-containers-for-production-2


set -e

export IMAGE_NAME=tinco/express-example
export RUN_BUILD="docker run -it --rm -v $PWD:/usr/src/app -w /usr/src/app node:6"
export TEST_COMMAND="./node_modules/mocha/bin/mocha"

function run_image() {
           docker run -it --entrypoint /bin/sh $IMAGE_NAME -c $1
}

function build_image() {
           $RUN_BUILD npm install
           docker build -t $IMAGE_NAME .
}

function test_image() {
           run_image $TEST_COMMAND
}

function check_git() {
           if [[ `git status --porcelain` ]]; then
               echo "Current working directory is dirty, run 'git status' for details."
               exit 1
           fi

           if [[ `git branch --no-color|grep "*"|awk '{ print $2 }'` != $TAG ]]; then
               echo "Current branch is not $TAG, checkout and merge that branch before releasing."
               exit 1
           fi
}

function push() {
           git push
           docker tag $IMAGE_NAME $IMAGE_NAME:$TAG
           docker push $IMAGE_NAME:$TAG
}

case "$1" in
           build)
               build_image
               ;;
           test)
               $RUN_BUILD $TEST_COMMAND
               ;;
           test_image)
               test_image
               ;;
           release)
               export TAG=$2

               if  [ -z "$TAG" ]; then
                   echo "Please supply the tag to be released (i.e. ./docker.sh release production)"
                   exit 1
               fi

               build_image
               test_image
               check_git
               push
               ;;
           install)
               shift
               $RUN_BUILD npm install --save "$@"
               ;;
           *)
               echo "Usage: ./docker.sh <command>"
               echo ""
               echo "For <command> choose any of: build, test, test_image, install, release"
esac