anchor.diff:  
   RUN     echo "deb http://cran.rstudio.com/bin/linux/ubuntu trusty/" \
           >> /etc/apt/sources.list \
  -        && apt-key adv --keyserver keys.gnupg.net --recv-key 51716619E084DAB9 \
  -        && apt-get update \
  -        && apt-get -y install --no-install-recommends \
  +       	&& apt-key adv --keyserver keys.gnupg.net --recv-key 51716619E084DAB9 \ 
  +	&& apt-get update \
  +        && apt-get install -y --no-install-recommends \
           r-base \
           r-base-dev \
           r-doc-info \
  
positive.code: 
  ENV     PATH `which rstudio-server`:${PATH}
  
  RUN     apt-get clean \
          && rm -rf /var/lib/apt/lists/
  
  COPY    supervisord.conf /etc/supervisor/conf.d/supervisord.conf
  
  
negative.code:         && git config --system push.default simple \
          && echo "dst:science" | chpasswd
  
  RUN     apt-get install -y --no-install-recommends \
          wget \
          ca-certificates
  
  