anchor.diff:      JENKINS_ADMIN_PASSWORD=admin \
       JENKINS_SLAVE_AGENT_PORT=${agent_port} \
       JENKINS_VERSION=${JENKINS_VERSION:-2.60.2}
  -
  -# Jenkins is run with user `jenkins`, uid = 1000
  -# If you bind mount a volume from the host or a data container,
  -# ensure you use the same uid
  -RUN groupadd -g ${gid} ${group} \
  -    && useradd -d "$JENKINS_HOME" -u ${uid} -g ${gid} -m -s /bin/bash ${user}
   
   # `/usr/share/jenkins/ref/` contains all reference configuration we want
   # to set on a fresh new installation. Use it to bundle additional plugins
  
positive.code: RUN yum install -y git wget zip unzip java-1.8.0-openjdk
  
  # install jenkins
  ARG user=jenkins
  ARG group=jenkins
  ARG uid=1000
  ARG gid=1000
  ARG http_port=8080
  ARG agent_port=50000
  ARG JENKINS_VERSION=2.60.2
  
negative.code: 
  RUN chmod +x /usr/local/bin/install-plugins.sh /usr/local/bin/jenkins.sh && \
      /usr/local/bin/install-plugins.sh < /usr/share/jenkins/ref/plugins.txt && \
      touch "${COPY_REFERENCE_FILE_LOG}"
  
  # install openshift client
  ARG OPENSHIFT_VERSION=v3.6.0
  