anchor.diff:  COPY ./docker-entrypoint.sh /docker-entrypoint.sh
   
   RUN set -ex ; \
  -    if test "x$branch" = "xmainline" ; \
  -    then \
  -        nginx_version=$NGINX_MAINLINE_VERSION ; \
  -    elif test "x$branch" = "xstable" ; \
  -    then \
  -        nginx_version=$NGINX_STABLE_VERSION ; \
  -    else \
  -        >&2 echo "Error: unknown branch."  ; \
  -        exit 1 ; \
  -    fi ; \
  -    \        
       gpg_keys=" \
           0xB0F4253373F8F6F510D42178520A9993A1C052F8 \
           251A28DE2685AED4 \
  
positive.code:         nginx.tar.gz \
      ; \
      \
      cd /tmp/nginx-$nginx_version ; \
      ./configure $config ; \
      make -j$(getconf _NPROCESSORS_ONLN) ; \
      make install ; \
  
negative.code:     cd /tmp ; \
      curl \
          -fSL \
          http://nginx.org/download/nginx-$NGINX_VERSION.tar.gz \
          -o nginx.tar.gz \
      ; \
      curl \
          -fSL \
          http://nginx.org/download/nginx-$NGINX_VERSION.tar.gz.asc \
          -o nginx.tar.gz.asc \
      ; \
      curl \
  