+ geckodriver --version | grep ^geckodriver || echo "No geckodriver. Try: arvados-server install"
+ echo -n 'singularity: '
+ singularity --version || fatal "No singularity. Try: arvados-server install"
+ echo -n 'docker client: '
+ docker --version || echo "No docker client. Try: arvados-server install"
+ echo -n 'docker server: '
+ docker info --format='{{.ServerVersion}}' || echo "No docker server. Try: arvados-server install"