+func rpcFromEnv() (*rpc.Conn, error) {
+ ac := arvados.NewClientFromEnv()
+ if ac.APIHost == "" || ac.AuthToken == "" {
+ return nil, fmt.Errorf("fatal: ARVADOS_API_HOST and ARVADOS_API_TOKEN environment variables are not set, and ~/.config/arvados/settings.conf is not readable")
+ }