anchor.diff:  
   
   ################################################################################
  -# CONFIG
  -################################################################################
  -
  -# Password set in sshd/run script at ssh start. allows for override via env var.
  -RUN set -e; \
  -  groupadd --system airstack --gid 432; \
  -  useradd --uid 431 --system --base-dir /home --create-home --gid airstack --shell /bin/nologin --comment "airstack user" airstack; \
  -  chown -R airstack:airstack /home/airstack
  -
  -# TODO: passwordless sudo enabled for airstack user. should only do for development environment.
  -#       RUN [ $AIRSTACK_TAGS_ENV = "development" ] && echo "airstack  ALL = NOPASSWD: ALL" > /etc/sudoers.d/airstack && usermod --shell /bin/bash airstack
  -RUN set -e; \
  -  echo "airstack  ALL = NOPASSWD: ALL" > /etc/sudoers.d/airstack; \
  -  usermod --shell /bin/bash airstack
  -
  -# Default run command
  -CMD exec sudo -E sh /usr/local/bin/container-start
  -
  -
  -################################################################################
   # SERVICES
  -################################################################################
  -
  +#
   # Add Airstack core commands
   # This should appear as late in the Dockerfile as possible to make builds as
   # fast as possible.
  +################################################################################
  +
   
   COPY core /package/airstack/core
   RUN ln -s /package/airstack/core/command/core-* /command/
  
positive.code: # - use core helper functions to install packages
  # - /command/core-package-install
  #
  
  FROM debian:jessie
  MAINTAINER airstack team <support@airstack.io>
  
  USER root
  ENV HOME /root
  WORKDIR /root
  
  ONBUILD USER airstack
  ONBUILD ENV HOME /home/airstack
  ONBUILD WORKDIR /home/airstack
  
  
  ################################################################################
  
negative.code: ################################################################################
  # CORE Dockerfile
  # MAINTAINER airstack team <support@airstack.io>
  #
  # RUN:
  # - single command on one line
  