anchor.diff:  
   # Default location for the Scale UI to be retrieved from.
   # This should be changed on disconnected networks to point to the directory with the tarballs.
  -ENV SCALE_UI_URL https://s3.amazonaws.com/ais-public-artifacts/scale-ui/scale-ui.tar.gz \
  -    GOSU_URL https://github.com/tianon/gosu/releases/download/1.9/gosu-amd64
  +ARG SCALE_UI_URL=https://s3.amazonaws.com/ais-public-artifacts/scale-ui/scale-ui.tar.gz
  +ARG GOSU_URL=https://github.com/tianon/gosu/releases/download/1.9/gosu-amd64
   
   # setup the scale user and sudo so mounts, etc. work properly
   RUN useradd --uid 7498 -M -d /opt/scale scale
  
positive.code: # install required packages for scale execution
  COPY dockerfiles/framework/scale/epel-release-7-5.noarch.rpm /tmp/
  COPY dockerfiles/framework/scale/mesos-0.25.0-py2.7-linux-x86_64.egg /tmp/
  COPY dockerfiles/framework/scale/*shim.sh /opt/scale/
  COPY scale/pip/prod_linux.txt /tmp/
  RUN rpm -ivh /tmp/epel-release-7-5.noarch.rpm \
   && yum install -y \
  
negative.code:  && rm -f /etc/httpd/conf.d/welcome.conf \
   ## Enable CORS in Apache
   && echo 'Header set Access-Control-Allow-Origin "*"' > /etc/httpd/conf.d/cors.conf \
   && yum clean all
  
  # install the source code and config files
  COPY dockerfiles/framework/scale/entryPoint.sh /opt/scale/
  