anchor.diff:  # vi: set ft=sh :
   
   FROM ubuntu:12.04
  -MAINTAINER Alberto Grespan
  +MAINTAINER Alberto Grespan "alberto@codehero.co"
   
   # Install add-apt-repository
   RUN apt-get install -y python-software-properties
  
positive.code: # tell Nginx to stay foregrounded
  RUN echo "daemon off;" >> /etc/nginx/nginx.conf
  
  EXPOSE 80
  
  CMD ["nginx"]
  
negative.code: RUN add-apt-repository "deb http://archive.ubuntu.com/ubuntu $(lsb_release -sc) universe"
  RUN add-apt-repository ppa:nginx/stable
  
  # Update known version packeges.
  RUN apt-get update -y
  RUN apt-get update -y --fix-missing
  
  