anchor.diff:  #
   
   # Pull base image.
  -FROM python:2
  +FROM pypy:2
   
   # Grab latest version of plexus, unpack it, install dependencies, and install it.
   RUN apt-get update && \
       apt-get install -y --no-install-recommends \
  -      python-pip \
         wget \
         unzip && \
       apt-get clean && \
  
positive.code:     rm /opt/plexus.zip && \
      cd /opt/plexus && \
      pip install -r pip-requires && \
      python ./setup.py install
  
  # Add the plexus user and group
  RUN useradd -ms /sbin/nologin plexus
  
negative.code: 
  # Change user, and run.
  USER plexus
  ENTRYPOINT pypy /usr/local/bin/ryu run --config-file /etc/plexus/ryu.conf
  