anchor.diff:  #
   # N.B. Make sure to keep the Dockerfile and bootstrap script in sync wrt. packages.
   
  -FROM amazonlinux:2017.03
  +FROM amazonlinux:2018.03
   
   RUN yum install -y \
           aws-cli \
  
positive.code: COPY requirements*.txt /tmp/
  RUN virtualenv --python=python3 /opt/local/redshift_etl/venv && \
      source /opt/local/redshift_etl/venv/bin/activate && \
      pip3 install --upgrade pip --disable-pip-version-check --no-cache-dir && \
      pip3 install --requirement /tmp/requirements-dev.txt --disable-pip-version-check --no-cache-dir
  
  # Create an empty .pgpass file to help with create_user and update_user commands.
  RUN echo '# Format to set password (used by create_user and update_user): *:5439:*:<user>:<password>' > /home/arthur/.pgpass \
  
negative.code:         jq \
          libyaml-devel \
          openssh-clients \
          tmux \
          vim-minimal \
      && \
      python3 -m pip install --upgrade --disable-pip-version-check virtualenv
  
  # Run as non-priviledged user "arthur".
  RUN useradd --comment 'Arthur ETL' --user-group --create-home arthur && \
  