anchor.diff:  
   ARG redis_version=5.0.2
   ARG redis_home=/opt/redis
  -
  -RUN adduser --disabled-login --gecos '' redis
   
   WORKDIR ${redis_home}
   
  
positive.code: 
  RUN cd /opt && \
            apt-get update -y && \
            apt-get install -y wget \
                                               gcc \
                                               make && \
            apt-get clean && \
  
negative.code:            cd redis-src && \
             make && \
             make PREFIX=${redis_home} install
  
  RUN adduser --disabled-login --gecos '' redis && \
      usermod -G sudo redis
  
  RUN echo "Defaults:redis !requiretty" >> /etc/sudoers.d/redis && \
      echo "redis ALL=(ALL)      NOPASSWD: ALL" >> /etc/sudoers.d/redis && \
      chmod 440 /etc/sudoers.d/redis
  
  RUN chown -R redis.redis ${redis_home} && \
             chown -R redis.redis /opt/redis-src
  