Docker images for deploying Heroku to use npm

docker-compose.yml

web:
  build: .
  command: 'bash -c ''bundle exec puma -C config/puma.rb'''
  working_dir: /app/user
  environment:
    RAILS_ENV: 'production'
    RACK_ENV: 'production'
    PORT: 8080
    DATABASE_URL: 'postgres://postgres:@herokuPostgresql:5432/postgres'
  ports:
    - '8080:8080'
  links:
    - herokuPostgresql
shell:
  build: .
  command: bash
  working_dir: /app/user
  environment:
    PORT: 8080
    DATABASE_URL: 'postgres://postgres:@herokuPostgresql:5432/postgres'
  ports:
    - '8080:8080'
  links:
    - herokuPostgresql
  volumes:
    - '.:/app/user'
herokuPostgresql:
  image: postgres

Dockerfile

# cf: https://hub.docker.com/r/heroku/ruby/~/dockerfile/

FROM heroku/cedar:14

RUN mkdir -p /app/user
WORKDIR /app/user

ENV GEM_PATH /app/heroku/ruby/bundle/ruby/2.2.0
ENV GEM_HOME /app/heroku/ruby/bundle/ruby/2.2.0
RUN mkdir -p /app/heroku/ruby/bundle/ruby/2.2.0

# Install Ruby
RUN mkdir -p /app/heroku/ruby/ruby-2.2.3
RUN curl -s --retry 3 -L https://heroku-buildpack-ruby.s3.amazonaws.com/cedar-14/ruby-2.2.3.tgz | tar xz -C /app/heroku/ruby/ruby-2.2.3
ENV PATH /app/heroku/ruby/ruby-2.2.3/bin:$PATH

# Install Node
RUN curl -s --retry 3 -L http://s3pository.heroku.com/node/v0.12.7/node-v0.12.7-linux-x64.tar.gz | tar xz -C /app/heroku/ruby/
RUN mv /app/heroku/ruby/node-v0.12.7-linux-x64 /app/heroku/ruby/node-0.12.7
ENV PATH /app/heroku/ruby/node-0.12.7/bin:/app/user/node_modules/.bin:$PATH

# Install Bundler
RUN gem install bundler -v 1.9.10 --no-ri --no-rdoc
ENV PATH /app/user/bin:/app/heroku/ruby/bundle/ruby/2.2.0/bin:$PATH
ENV BUNDLE_APP_CONFIG /app/heroku/ruby/.bundle/config

# Run bundler and npm to cache dependencies
COPY ["Gemfile", "Gemfile.lock", "package.json", "/app/user/"]
RUN bundle install --path /app/heroku/ruby/bundle --jobs 4
RUN /app/heroku/ruby/node-0.12.7/bin/npm install

ADD . /app/user

# How to conditionally `rake assets:precompile`?
ENV RAILS_ENV production
ENV SECRET_KEY_BASE $(openssl rand -base64 32)
RUN bundle exec rake assets:precompile

# export env vars during run time
RUN mkdir -p /app/.profile.d/
RUN echo "cd /app/user/" > /app/.profile.d/home.sh
RUN echo "export PATH=\"$PATH\" GEM_PATH=\"$GEM_PATH\" GEM_HOME=\"$GEM_HOME\" RAILS_ENV=\"\${RAILS_ENV:-$RAILS_ENV}\" SECRET_KEY_BASE=\"\${SECRET_KEY_BASE:-$SECRET_KEY_BASE}\" BUNDLE_APP_CONFIG=\"$BUNDLE_APP_CONFIG\"" > /app/.profile.d/ruby.sh

COPY ./init.sh /usr/bin/init.sh
RUN chmod +x /usr/bin/init.sh

ENTRYPOINT ["/usr/bin/init.sh"]

init.sh

#!/bin/bash

for SCRIPT in /app/.profile.d/*;
  do source $SCRIPT;
done

exec "$@"

package.json

{
  "private": true,
  "dependencies" : {
    "babel-plugin-transform-es2015-modules-commonjs": "^6.3.16",
    "babel-preset-es2015": "^6.3.13",
    "babelify": "^7.2.0",
    "browserify": "~10.2.4",
    "browserify-incremental": "^3.0.1"
  },
  "license": "MIT",
  "engines": {
    "node": ">= 0.10"
  }
}

Procfile

web: bundle exec puma -C config/puma.rb