anchor.diff:  
       # Create a dev user to use as the directory owner
       && groupadd dev \
  -    && useradd dev -s /bin/bash -m -g dev -G root \
  +    && useradd dev -s /bin/sh -m -g dev -G root \
       && echo "dev:password" | chpasswd \
  -    && chmod 0777 /home/dev \
   
       # Install composer
  -    && mkdir /dev/composer \
  -    && chmod -R 0777 /dev/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 \
   
  
positive.code: COPY container/as-user /as-user
  COPY container/composer-wrapper /composer-wrapper
  
  ENV COMPOSER_HOME /dev/composer
  ENV COMPOSER_VERSION master
  
  VOLUME /src
  
negative.code: RUN set -x \
  
      # Install required packages
      && apk add --no-cache --repository "http://dl-cdn.alpinelinux.org/alpine/edge/testing" \
          ca-certificates \
          git \
          mercurial \
  