anchor.diff:  ADD roles/ /ansible/roles
   ADD provision.yml /ansible/provision.yml
   ADD postgresql_provision.yml /ansible/postgresql_provision.yml
  +
   RUN ansible-playbook /ansible/postgresql_provision.yml && \
       ansible-playbook /ansible/provision.yml \
       --extra-vars galaxy_venv_dir=$GALAXY_VIRTUAL_ENV \
  
positive.code:     chown -R $GALAXY_USER:$GALAXY_USER $GALAXY_ROOT && \
      # Setup Galaxy configuration files.
      mkdir -p $GALAXY_CONFIG_DIR $GALAXY_CONFIG_DIR/web && \
      chown -R $GALAXY_USER:$GALAXY_USER $GALAXY_CONFIG_DIR
  
  RUN su $GALAXY_USER -c "cp $GALAXY_ROOT/config/galaxy.ini.sample $GALAXY_CONFIG_FILE"
  ADD ./reports_wsgi.ini.sample $GALAXY_CONFIG_DIR/reports_wsgi.ini
  
negative.code: ENV GALAXY_RELEASE=${GALAXY_RELEASE:-dev} \
  GALAXY_REPO=${GALAXY_REPO:-https://github.com/galaxyproject/galaxy} \
  GALAXY_ROOT=/galaxy-central \
  GALAXY_CONFIG_DIR=/etc/galaxy \
  DEBIAN_FRONTEND=noninteractive
  
  ENV GALAXY_CONFIG_FILE=$GALAXY_CONFIG_DIR/galaxy.ini \
  GALAXY_CONFIG_JOB_CONFIG_FILE=$GALAXY_CONFIG_DIR/job_conf.xml \
  