anchor.diff:  RUN touch ~/magpie_cron_status.log
   # set /etc/environment so that cron runs using the environment variables set by docker
   RUN env >> /etc/environment
  +
  +COPY magpie/__init__.py magpie/__meta__.py ./magpie/
  +COPY requirements* setup.py README.rst HISTORY.rst ./
   
   RUN apk update && apk add \
           bash \
  
positive.code:     pip install --no-cache-dir -e $MAGPIE_DIR && \
      apk --purge del .build-deps
  
  # equivalent of `make install` without conda env and pre-installed packages
  RUN pip install --no-dependencies -e $MAGPIE_DIR
  # equivalent of `make cron start` without conda env
  
negative.code: ARG MAGPIE_DIR=/opt/local/src/magpie
  ENV MAGPIE_ENV_DIR=$MAGPIE_DIR/env
  WORKDIR $MAGPIE_DIR
  
  # magpie cron service
  ADD magpie-cron /etc/cron.d/magpie-cron
  