// doStepBack performs a stepback on the task if there is a previous task and if not it returns nothing.
func doStepback(t *task.Task, caller string, detail *apimodels.TaskEndDetail, deactivatePrevious bool) error {
//See if there is a prior success for this particular task.
//If there isn't, we should not activate the previous task because
//it could trigger stepping backwards ad infinitum.
prevTask, err := t.PreviousCompletedTask(t.Project, []string{evergreen.TaskSucceeded})
if prevTask == nil {
return nil
}
if err != nil {
return fmt.Errorf("Error locating previous successful task: %v", err)
}
// activate the previous task to pinpoint regression
return ActivatePreviousTask(t.Id, caller)
}
