anchor.diff:  
   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}" && \
  -    chown -R ${user}:${group} $JENKINS_HOME /usr/share/jenkins/ref /usr/local/bin
  +    touch "${COPY_REFERENCE_FILE_LOG}"
   
   # install openshift client
   ARG OPENSHIFT_VERSION=v3.6.0
  
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:     JENKINS_ADMIN_PASSWORD=admin \
      JENKINS_SLAVE_AGENT_PORT=${agent_port} \
      JENKINS_VERSION=${JENKINS_VERSION:-2.60.2}
  
  # `/usr/share/jenkins/ref/` contains all reference configuration we want
  # to set on a fresh new installation. Use it to bundle additional plugins
  