anchor.diff:  
   EXPOSE 8080
   
  -# Install all application dependencies into a new virtualenv.
  +RUN ln -s /home/vmagent/app /app
   WORKDIR /app
  -ONBUILD RUN virtualenv /env
  -ONBUILD ADD requirements.txt /app/requirements.txt
  -ONBUILD RUN /env/bin/pip install -r /app/requirements.txt
  -ONBUILD ADD . /app
   
  -# Set virtualenv environment variables. This is equivalent to running source
  -# /env/bin/activate
  -ENV VIRTUAL_ENV /env
  -ENV PATH /env/bin:$PATH
   ENV PORT 8080
   
   CMD []
  -# The user's Dockerfile must specify an entrypoint.
  +# The user's Dockerfile must specify an entrypoint with ENTRYPOINT or CMD.
  
positive.code: # The Google App Engine base image is debian (wheezy) with ca-certificates
  # installed.
  FROM gcr.io/google_appengine/base
  
  
negative.code: # Python libraries.
  RUN apt-get -q update && \
   apt-get install --no-install-recommends -y -q \
     python2.7 python3.4 python-pip python-dev build-essential git mercurial \
     libffi-dev libssl-dev libxml2-dev \
     libxslt1-dev libpq-dev libmysqlclient-dev libcurl4-openssl-dev \
     libjpeg-dev zlib1g-dev libpng12-dev && \
  