anchor.diff:  COPY . /usr/src/app
   RUN chown -R app:app /usr/src/app
   
  +# ENV PURE_HASH=1
  +# ENV CODECLIMATE_PROFILE=1
  +
   USER app
   
   CMD ["/usr/src/app/bin/duplication"]
  
positive.code:     curl -sSL https://nodejs.org/dist/${NODE_VERSION}/SHASUMS256.txt.asc | gpg --batch --decrypt | \
        grep " node-${NODE_VERSION}.tar.xz\$" | sha256sum -c | grep . && \
      tar -xf node-${NODE_VERSION}.tar.xz && \
      cd node-${NODE_VERSION} && \
      ./configure --prefix=/usr ${CONFIG_FLAGS} && \
      make -j$(getconf _NPROCESSORS_ONLN) && \
      make install && \
      cd / && \
      if [ -x /usr/bin/npm ]; then \
        npm install -g npm@${NPM_VERSION} && \
        find /usr/lib/node_modules/npm -name test -o -name .bin -type d | xargs rm -rf; \
      fi && \
      apk del curl make gcc g++ linux-headers binutils-gold gnupg ${DEL_PKGS} && \
      rm -rf ${RM_DIRS} /node-${NODE_VERSION}* /usr/share/man /tmp/* /var/cache/apk/* \
        /root/.npm /root/.node-gyp /root/.gnupg /usr/lib/node_modules/npm/man \
        /usr/lib/node_modules/npm/doc /usr/lib/node_modules/npm/html /usr/lib/node_modules/npm/scripts
  
  RUN apk add --update curl && \
      gem install bundler --no-ri --no-rdoc && \
      bundle install -j 4 && \
      curl -sS https://getcomposer.org/installer | php && \
      apk del --purge curl
  
  RUN mv composer.phar /usr/local/bin/composer
  RUN cd /usr/src/app/vendor/php-parser/ && composer install --prefer-source --no-interaction
  
negative.code: 
  COPY package.json /usr/src/app/
  
  RUN apk update && apk add python python3 php5-phar php5-openssl php5-cli php5-json php5-zlib php5-xml git
  
  ENV NODE_VERSION=v5.12.0 \
      NPM_VERSION=3 \
      CONFIG_FLAGS="--fully-static" \
      DEL_PKGS="libstdc++" \
      RM_DIRS=/usr/include
  
  WORKDIR /
  
  # sed line below is for aufs: https://github.com/npm/npm/issues/13306#issuecomment-236876133
  
  # https://github.com/npm/npm/pull/10373#issuecomment-195742307
  
  # Based on https://github.com/mhart/alpine-node
  RUN apk add --no-cache curl make gcc g++ linux-headers binutils-gold gnupg libstdc++ && \
  