anchor.diff:  RUN \
     DEBIAN_FRONTEND=noninteractive; RUNLEVEL=1; \
     apt-get update -qqy && \
  +  apt-get upgrade -y -o Dpkg::Options::="--force-confold" && \
     apt-get install -qqy --allow-downgrades \
  -    bash posh dash \
  -    tree realpath uuid-runtime moreutils \
  -    sudo tree realpath \
  -    vim git curl dropbear \
  -    build-essential uuid-runtime \
  -    python python-tox \
  -    npm nodejs \
  -    ruby-full \
  -    php && \
  -  rm -rf /var/cache/apt/* && \
  -  \
  +    bash build-essential curl dash dropbear elinks git graphviz imagemagick \
  +    make man moreutils netcat nodejs npm pandoc php posh \
  +    python python-dev python-tox python-yaml \
  +    realpath ruby-full rubygems socat sqlite3 ssh sudo tmux tree uuid-runtime \
  +    vim && \
  +  rm -rf /var/cache/apt/*
  +
  +RUN \
     npm install --quiet -g npm && \
         npm cache clean -f && \
         npm install --quiet -g n && \
         n stable && \
  -  \
     chmod g+rw /usr/local/* /usr/local/lib/node_modules && \
     chgrp staff /usr/local/* /usr/local/lib/node_modules && \
  -  \
     version="$(cd /usr/local/n/versions/node/; echo * | tr ' ' '\n' | sort -rn | head -n 1)"; \
  -  { test -e /usr/bin/node || ln -sf /usr/local/n/versions/node/$version/bin/node /usr/bin/node ; }; \
  -  \
  +  { test -e /usr/bin/node || ln -sf /usr/local/n/versions/node/$version/bin/node /usr/bin/node ; }
  +
  +RUN \
     cd /tmp/ && curl https://bootstrap.pypa.io/get-pip.py -o get-pip.py && python get-pip.py && \
     pip install --quiet \
     	    setuptools PyYAML zope.interface zope.component objectpath docutils && \
     for b in rst2html rst2xml rst2pxml; do \
  -    ln -s /usr/local/bin/$b.py /usr/local/bin/$b; done; \
  -  \
  +    ln -s /usr/local/bin/$b.py /usr/local/bin/$b; done
  +
  +RUN \
     npm install --quiet -g coffee-script pm2 grunt grunt-cli webpack && \
     gem install --quiet sass
   
   # TODO: fix pm2 fsevents
   # TODO: accumulating current dev deps above. should split up into multiple bases and derivatives, one big one perhaps
  +
   
   RUN \
     echo 'export PATH=$PATH:/usr/local/bin' > /etc/profile.d/ssh-environment; \
  
positive.code: # Setup passwordless sudo
  RUN \
    addgroup supergroup && \
    echo "%supergroup  ALL=(ALL) NOPASSWD:ALL" >> /etc/sudoers
  
  
  # Setup user
  
negative.code: 
  ARG X_DCKR_TAG=xenial
  FROM ubuntu:$X_DCKR_TAG
  
  