anchor.diff: +# Preamble image. First, we built a bikeshed so there's a place we can think of
  +# as coming to work.
  +
   FROM buildpack-deps:jessie
   
   ENV \
  
positive.code: 	&& echo 'locales locales/locales_to_be_generated multiselect en_US.UTF-8 UTF-8' \
  		| debconf-set-selections \
  
  	&& sed -i -- 's/http:\/\/deb/http:\/\/httpredir/g' /etc/apt/sources.list \
  
  	&& echo 'APT::Default-Release "jessie";' \
  		> /etc/apt/apt.conf.d/99preferjessie \
  
  	&& echo '\
  	Package: *\n\
  	Pin: release a=testing,a=testing/main \n\
  	Pin-Priority: 100' \
  	>> /etc/apt/preferences.d/testing \
  
  	&& echo '\
  	deb http://httpredir.debian.org/debian testing main\n' \
  	>> /etc/apt/sources.list.d/testing.list \
  
  	&& apt-get update && apt-get install -y apt-utils \
  	&& apt-get install -y -qq --no-install-recommends \
  		apt-transport-https \
  
negative.code: 		fuse \
  	&& rm -rf /var/lib/apt/lists/* \
  
  	# Confgiure locale.
  	&& locale-gen en_US.UTF-8 \
  	&& dpkg-reconfigure locales \
  	&& /usr/sbin/update-locale update-locale LC_ALL=en_US.UTF-8 LANG=en_US.UTF-8
  