anchor.diff:  RUN mkdir /homedir && chmod 777 /homedir
   ENV HOME /homedir
   
  +# Handy to be able to run a Jupyter notebook (eg at NERSC)
  +RUN pip install ipykernel
  +
   # set prompt and default shell
   SHELL ["/bin/bash", "-c"]
  +ENTRYPOINT ["/bin/bash", "-c"]
  +CMD ["/bin/bash"]
   
   RUN echo "export PS1='[container] \\u@\\h:\\w$ '" >> $HOME/.bashrc \
     # Create config files in $HOME
  
positive.code:     /src/legacypipe/py/{legacypipe,legacyzpts}
  
  # update legacypipe
  RUN cd /src/legacypipe && git pull && git describe && echo 34 && \
    python    -m compileall /src/legacypipe/py/{legacypipe,legacyzpts} && \
    python -O -m compileall /src/legacypipe/py/{legacypipe,legacyzpts}
  
negative.code:     https://raw.githubusercontent.com/astropy/astropy/master/astropy/utils/iers/data/Leap_Second.dat \
      && rm $HOME/.wget-hsts
  
  RUN python -O -m compileall \
      -x lib2to3 \
      /usr/local/lib/python \
  