anchor.diff:  
   # DB_ENDPOINT host[:port]
   ENV DB_ENDPOINT localhost
  -
   ENV KEYPASS_VERSION 1.9.0
   ENV JAVA_VERSION "1.8.0"
   ENV JAVA_HOME /usr/lib/jvm/java-${JAVA_VERSION}-openjdk-amd64
  +ENV CLEAN_DEV_TOOLS ${CLEAN_DEV_TOOLS:-1}
   
   COPY . /opt/keypass/
   WORKDIR /opt/keypass
  
positive.code:     # Install dependencies
      apt-get -y install openjdk-8-jdk && \
      apt-get -y install \
        tzdata \
        curl \
        libjaxb-java \
        netcat-traditional \
        maven && \
        # Build keypass
  
negative.code:     #echo "INFO: Cleaning unused software..." && \
      apt-get clean && \
      if [ ${CLEAN_DEV_TOOLS} -eq 0 ] ; then exit 0 ; fi && \
      # remove the same packages we installed at the beginning to build Keypass
      apt-get -y autoremove --purge && \
      # Don't need old log files inside docker images
      rm -f /var/log/*log
  