anchor.diff:  COPY container/as-user /as-user
   COPY container/composer-wrapper /composer-wrapper
   
  -ENV COMPOSER_HOME /dev/composer
  +ENV COMPOSER_HOME /home/dev/.composer
   ENV COMPOSER_VERSION master
   
   VOLUME /src
  
positive.code: RUN set -x \
  
      # Install required packages
      && apk add --no-cache  --repository "http://dl-cdn.alpinelinux.org/alpine/edge/testing" \
          ca-certificates \
          git \
          mercurial \
  
negative.code: 
      # Create a dev user to use as the directory owner
      && groupadd dev \
      && useradd dev -s /bin/sh -m -g dev -G root \
      && echo "dev:password" | chpasswd \
  
      # Install composer
      && mkdir /home/dev/.composer \
      && echo "PATH=\$PATH:/home/dev/.composer/vendor/bin" > /home/dev/.profile \
      && chmod -R 0755 /home/dev \
      && chown -R dev:dev /home/dev \
      && curl -sS https://getcomposer.org/installer | php -- --install-dir=/usr/local/bin --filename=composer \
      && sudo -u dev /usr/local/bin/composer config -g secure-http false \
  
  