NPM docker local dev environment

docker_command

PWD=$(pwd)

docker run --rm -v $PWD:/opt/workspace -p 3000:3000 nodeenv "$@" 

Dockerfile

FROM node:8.9.4-alpine

RUN apk update
RUN apk upgrade
RUN apk add bash

RUN mkdir -p /opt/workspace
WORKDIR /opt/workspace
VOLUME /opt/workspace

COPY entrypoint.sh /entrypoint.sh
RUN chmod 755 /entrypoint.sh

ENTRYPOINT [ "/entrypoint.sh" ]

CMD [ "npm", "start" ]

EXPOSE 3000

entrypoint.sh

#!/usr/bin/env bash

set -e  
set -o pipefail

# calculate the md5 sum of the package.json and save it in the node_module directory
function calc_package_md5 {  
  md5sum ./package.json  | awk '{print $1}' > ./node_modules/package_json_md5
}

# install npm dependencies
function npmi {  
  npm prune
  npm install
  npm ddp # npm dedupe - flatten node_modules hierarchy
}

# install / update dependencies only if necessary
function prepare {  
  # ok, is there a node_modules folder?
  if [[ ! -d './node_modules' ]]; then
    npmi
    calc_package_md5
    return
  fi

  # ok, node_modules folder there, but is there an old package_json_md5 file?
  if [[ ! -f './node_modules/package_json_md5' ]]; then
    npmi
    calc_package_md5
    return
  fi

  # ok all is there, but did the package json update?
  if [[ "$(md5sum ./package.json  | awk '{print $1}')" != "$(cat ./node_modules/package_json_md5)" ]]; then
    npmi
    calc_package_md5
    return
  fi
}

# install / update dependencies if necessary
prepare  
# run the actual command given
# - use double quotes to prevent splitting of arguments with spaces
exec npm "$@"  

npm

PWD=$(pwd)

docker run --rm -v $PWD:/opt/workspace -p 3000:3000 nodeenv "$@"