anchor.diff:  
   # Setup working directory
   workdir /home/dev
  -
  -# Cleanup
  -run rm -rf /tmp/* && apt-get clean
   
   # Run everything below as the dev user
   user dev
  
positive.code: env HOME /home/dev
  env PATH $HOME/bin:$PATH
  
  # Create src data volume
  # We need to create an empty file, otherwise the volume will belong to root.
  run mkdir /var/shared/ && touch /var/shared/placeholder && chown -R dev:dev /var/shared
  
negative.code: # My devbox Docker image.
  #
  # VERSION 0.0.1
  
  from debian:jessie
  
  