anchor.diff:      && rm -rf buttervolume
   
   # add tini to avoid sshd zombie processes
  -ENV TINI_VERSION v0.18.0
  +ENV TINI_VERSION v0.19.0
   ADD https://github.com/krallin/tini/releases/download/${TINI_VERSION}/tini /tini
   RUN chmod +x /tini
   
  
positive.code: FROM debian:buster
  MAINTAINER Christophe Combelles. <ccomb@anybox.fr>
  
  RUN set -x; \
      apt-get update \
  
negative.code:         rsync \
      && rm -rf /var/lib/apt/lists/* \
      && mkdir -p /run/docker/plugins \
      && mkdir -p /var/lib/buttervolume/volumes \
      && mkdir -p /var/lib/buttervolume/snapshots \
      && mkdir /etc/buttervolume /root/.ssh
  
  ENV VERSION master
  