anchor.diff:  COPY certbot-apache /opt/certbot/src/certbot-apache/
   COPY certbot-nginx /opt/certbot/src/certbot-nginx/
   COPY certbot-compatibility-test /opt/certbot/src/certbot-compatibility-test/
  +COPY tools /opt/certbot/src/tools
   
   RUN virtualenv --no-site-packages -p python2 /opt/certbot/venv && \
       /opt/certbot/venv/bin/pip install -U setuptools && \
  -    /opt/certbot/venv/bin/pip install -U pip && \
  -    /opt/certbot/venv/bin/pip install \
  -    -e /opt/certbot/src/acme \
  -    -e /opt/certbot/src \
  -    -e /opt/certbot/src/certbot-apache \
  -    -e /opt/certbot/src/certbot-nginx \
  -    -e /opt/certbot/src/certbot-compatibility-test
  +    /opt/certbot/venv/bin/pip install -U pip
  +ENV PATH /opt/certbot/venv/bin:$PATH
  +RUN /opt/certbot/src/tools/pip_install_editable.sh \
  +    /opt/certbot/src/acme \
  +    /opt/certbot/src \
  +    /opt/certbot/src/certbot-apache \
  +    /opt/certbot/src/certbot-nginx \
  +    /opt/certbot/src/certbot-compatibility-test
   
   # install in editable mode (-e) to save space: it's not possible to
   # "rm -rf /opt/certbot/src" (it's stays in the underlaying image);
  
positive.code: 
  # TODO: Install non-default Python versions for tox.
  # TODO: Install Apache/Nginx for plugin development.
  COPY certbot-auto /opt/certbot/src/certbot-auto
  RUN /opt/certbot/src/certbot-auto -n --os-packages-only
  
  # the above is not likely to change, so by putting it further up the
  # Dockerfile we make sure we cache as much as possible
  
negative.code: # bash" and investigate, apply patches, etc.
  
  WORKDIR /opt/certbot/src/certbot-compatibility-test/certbot_compatibility_test/testdata
  