anchor.diff:  
   # Create Cooja shortcut and work directory
   RUN echo "#!/bin/bash\nant -Dbasedir=${COOJA} -f ${COOJA}/build.xml run" > ${HOME}/cooja && \
  -  chmod +x ${HOME}/cooja && \
  -  mkdir $WORK
  -
  -# Download, build and install Renode
  -RUN git clone --quiet https://github.com/renode/renode.git \
  -  && cd ${HOME}/renode \
  -  && git checkout v1.3 \
  -  && ./build.sh
  -ENV PATH="${HOME}/renode:${PATH}"
  -
  -# Dowload IoT-Lab boards support for contiki
  -RUN git clone https://github.com/iot-lab/openlab.git && \ 
  -        git clone --recursive https://github.com/iot-lab/contiki.git ${CONTIKI}
  -
  -# Upgrade contiki source
  -RUN cd ${CONTIKI} && \
  -        git config user.email "devel@niclabs.cl" && \
  -        git config user.name "NIC Labs Devel" && \
  -        git remote add contiki https://github.com/contiki-os/contiki.git && \
  -        git fetch contiki && \
  -        git merge --no-edit contiki/master
  +    chmod +x ${HOME}/cooja && \
  +    mkdir $WORK
   
   # Build cooja and fix all permissions
   RUN ANT_OPTS=-Dfile.encoding=utf8 ant -q -f ${COOJA}/build.xml jar && \
  -        fix-permissions $HOME
  +    fix-permissions ${COOJA}
   
   USER root
   
  
positive.code:     chmod 0440 /etc/sudoers && \
      chmod g+w /etc/passwd && \
      usermod -aG dialout $USER && \
      fix-permissions $HOME
  
  # Set user and workdir for what comes next
  
negative.code: ENV JAVA_HOME           /usr/lib/jvm/default-java
  ENV HOME                /home/${USER}
  ENV WORK                ${HOME}/work
  ENV OPENLAB             ${HOME}/openlab
  ENV CONTIKI             ${HOME}/contiki
  ENV COOJA               ${CONTIKI}/tools/cooja
  ENV                     PATH="${HOME}:${PATH}"
  