anchor.diff: -FROM node:4
  +# see https://xen-orchestra.com/docs/from_the_sources.html
   
  -# see https://xen-orchestra.com/docs/from_the_sources.html
  +FROM node:6
  +
  +RUN set -ex; \
  +	yarn global add node-gyp@3.5; \
  +	node-gyp --version
   
   WORKDIR /usr/src/xo/server
   
   # https://github.com/vatesfr/xo-server/releases
  -ENV XO_SERVER_REF v5.6.1
  +ENV XO_SERVER_REF v5.6.4
   # https://github.com/vatesfr/xo-web/releases
  -ENV XO_WEB_REF v5.6.0
  +ENV XO_WEB_REF v5.6.3
   
   RUN git clone -b "$XO_SERVER_REF" --depth 1 https://github.com/vatesfr/xo-server.git .
   RUN git clone -b "$XO_WEB_REF" --depth 1 https://github.com/vatesfr/xo-web.git ../web
  
positive.code: 	&& grep -q 'redis:6379' .xo-server.yaml
  
  EXPOSE 80
  CMD ["npm", "start"]
  
negative.code: ENV NPM_CONFIG_LOGLEVEL warn
  # https://docs.npmjs.com/misc/config#loglevel
  
  RUN set -ex; \
  	yarn
  
  RUN set -ex; \
  	cd ../web; \
  	yarn
  
  RUN set -x \
  	&& sed \
  