Makefile

up:
	docker-compose up -d

down:
	docker-compose down

rebuild:
	docker-compose run web bundle install
	docker-compose build

bootstrap:
	bash step1.sh
	bash step2.sh
	bash step3.sh
	bash step4.sh
	bash step5.sh

step1.sh

#!/bin/bash
cat > Dockerfile <<EOF
FROM ruby:2.5
RUN apt-get update -qq && apt-get install -y nodejs postgresql-client
RUN mkdir /myapp
WORKDIR /myapp
COPY Gemfile /myapp/Gemfile
COPY Gemfile.lock /myapp/Gemfile.lock
RUN bundle install
COPY . /myapp

# Add a script to be executed every time the container starts.
COPY entrypoint.sh /usr/bin/
RUN chmod +x /usr/bin/entrypoint.sh
ENTRYPOINT ["entrypoint.sh"]
EXPOSE 3000

# Start the main process.
CMD ["rails", "server", "-b", "0.0.0.0"]
EOF

step2.sh

#!/bin/bash
cat > entrypoint.sh <<"EOF"
#!/bin/bash
set -e

# Remove a potentially pre-existing server.pid for Rails.
rm -f /myapp/tmp/pids/server.pid

# Then exec the container's main process (what's set as CMD in the Dockerfile).
exec "$@"
EOF

step3.sh

#!/bin/bash
cat > docker-compose.yml <<"EOF"
version: '3'
services:
  db:
    image: postgres
    volumes:
      - ./tmp/db:/var/lib/postgresql/data
    environment:
      POSTGRES_PASSWORD: password
  web:
    build: .
    command: bash -c "rm -f tmp/pids/server.pid && bundle exec rails s -p 3000 -b '0.0.0.0'"
    volumes:
      - .:/myapp
    ports:
      - "3000:3000"
    depends_on:
      - db
EOF

step4.sh

#!/bin/bash
rm -rf app bin config config.ru db lib log package.json public test tmp vendor Gemfile Gemfile.lock
cat > Gemfile <<"EOF"
source 'https://rubygems.org'
gem 'rails', '~>5'
EOF

touch Gemfile.lock
docker-compose run --no-deps web rails new . --force --database=postgresql
docker-compose build

cat > config/database.yml <<"EOF"
default: &default
  adapter: postgresql
  encoding: unicode
  host: db
  username: postgres
  password: password
  pool: 5

development:
  <<: *default
  database: myapp_development


test:
  <<: *default
  database: myapp_test
EOF

step5.sh

#!/bin/bash
docker-compose up -d
sleep 3
docker-compose run web rake db:create
docker-compose down