targetResource, present, present+notpresent, sdcnum)
					return nil
				}
				select {
				case newVersion := <-w.resultsChan:
					printVerbosef(cmd, "received new target version: %s", newVersion)
					generations = append(generations, newVersion)
				case <-t.C:
					printVerbosef(cmd, "tick")
					continue
				case err = <-w.errorChan:
					t.Stop()