anchor.diff:  
   # Ignore APT warnings about not having a TTY
   ENV DEBIAN_FRONTEND noninteractive
  +ENV USERNAME postgres
  +ENV PASSWORD password
   
   # Ensure UTF-8 locale
   RUN echo "LANG=\"en_US.UTF-8\"" > /etc/default/locale
  
positive.code: USER postgres
  
  RUN /etc/init.d/postgresql start &&\
    psql --command "ALTER USER postgres WITH PASSWORD 'password';" &&\
    /etc/init.d/postgresql stop
  
  CMD ["/usr/lib/postgresql/9.3/bin/postgres", "-D", "/var/lib/postgresql/9.3/main", "-c", "config_file=/etc/postgresql/9.3/main/postgresql.conf"]
  
negative.code: # Install Postgres 9.3, PL/Python, PL/V8
  RUN apt-get install -y postgresql-9.3 postgresql-contrib-9.3 postgresql-server-dev-9.3 postgresql-plpython-9.3 postgresql-9.3-plv8
  
  # Clean up APT and temporary files when done
  RUN apt-get clean && rm -rf /var/lib/apt/lists/* /tmp/* /var/tmp/*
  
  ADD ./pg_hba.conf     /etc/postgresql/9.3/main/
  