anchor.diff:  
   COPY . /satis/
   
  -RUN set -eux; \
  +RUN set -eux ; \
     composer install \
       --no-interaction \
       --no-ansi \
  
positive.code: 
  FROM php:7-cli-alpine
  
  MAINTAINER https://github.com/composer/satis
  
  RUN set -eux; \
    apk add --no-cache --upgrade \
      bash \
      curl \
  
negative.code:     openssl \
      subversion \
      unzip \
      zip ; \
    docker-php-ext-install zip
  
  ENV COMPOSER_HOME /composer
  