anchor.diff:  RUN apt-get update -qq && apt-get install -qqy \
         apache2-utils \
         squid \
  -    && ln -s ${ACROSSFW_HOME}/service/squid /service/squid
  +    && ln -s ${ACROSSFW_HOME}/service/squid /service/squid \
  +    \
  +    && apt-get clean && rm -rf /var/lib/apt/lists/* /tmp/* /var/tmp/*
   EXPOSE 3128/tcp
   
   #
  
positive.code: 	  && echo "deb http://shadowsocks.org/debian wheezy main" > /etc/apt/sources.list.d/shadowsocks.list \
  	  && apt-get update -qq && apt-get install -qqy \
        shadowsocks-libev \
      && ln -s ${ACROSSFW_HOME}/service/shadowsocks /service/shadowsocks
  ENV SHADOWSOCKS_ENCRYPT_METHOD aes-256-cfb
  EXPOSE 8388/tcp 8388/udp
  
  
negative.code:     	screen \
      	shellcheck \
      	tcpdump \
      	tinc \
        \
      && apt-get clean && rm -rf /var/lib/apt/lists/* /tmp/* /var/tmp/*
  
  ENV BATS_VERSION 0.4.0
  RUN curl -s -o "/tmp/v${BATS_VERSION}.tar.gz" -L \
  