anchor.diff:  # Download Apache Bookkeeper, untar and clean up
   RUN set -x \
       && adduser "${BK_USER}" \
  -    && yum install -y java-1.8.0-openjdk-headless wget bash python md5sum sha1sum sudo \
  +    && yum install -y java-1.8.0-openjdk-headless wget bash python sudo \
       && mkdir -pv /opt \
       && cd /opt \
       && wget -q "https://archive.apache.org/dist/bookkeeper/bookkeeper-${BK_VERSION}/${DISTRO_NAME}.tar.gz" \
  
positive.code:     && tar -xzf "$DISTRO_NAME.tar.gz" \
      && mv bookkeeper-server-${BK_VERSION}/ /opt/bookkeeper/ \
      && rm -rf "$DISTRO_NAME.tar.gz" "$DISTRO_NAME.tar.gz.asc" "$DISTRO_NAME.tar.gz.md5" "$DISTRO_NAME.tar.gz.sha1" \
      && yum remove -y wget md5sum sha1sum \
      && yum clean all
  
  WORKDIR /opt/bookkeeper
  
negative.code: FROM centos:7
  MAINTAINER Apache BookKeeper <dev@bookkeeper.apache.org>
  
  ARG BK_VERSION=4.5.0
  ARG DISTRO_NAME=bookkeeper-server-${BK_VERSION}-bin
  ARG GPG_KEY=FD74402C
  
  ENV BOOKIE_PORT=3181
  EXPOSE $BOOKIE_PORT
  