// MachinesWithTransientErrors returns status data for machines with provisioning
// errors which are transient.
func (p *ProvisionerAPI) MachinesWithTransientErrors() (params.StatusResults, error) {
	results := params.StatusResults{}
	canAccessFunc, err := p.getAuthFunc()
	if err != nil {
		return results, err
	}
	// TODO (wallyworld) - add state.State API for more efficient machines query
	machines, err := p.st.AllMachines()
	if err != nil {
		return results, err
	}
	for _, machine := range machines {
		if !canAccessFunc(machine.Tag()) {
			continue
		}
		if _, provisionedErr := machine.InstanceId(); provisionedErr == nil {
			// Machine may have been provisioned but machiner hasn't set the
			// status to Started yet.
			continue
		}
		result := params.StatusResult{}
		if result.Status, result.Info, result.Data, err = machine.Status(); err != nil {
			continue
		}
		if result.Status != params.StatusError {
			continue
		}
		// Transient errors are marked as such in the status data.
		if transient, ok := result.Data["transient"].(bool); !ok || !transient {
			continue
		}
		result.Id = machine.Id()
		result.Life = params.Life(machine.Life().String())
		results.Results = append(results.Results, result)
	}
	return results, nil
}

func (s *StatusGetter) getEntityStatus(tag names.Tag) params.StatusResult {
	var result params.StatusResult
	entity, err := s.st.FindEntity(tag)
	if err != nil {
		result.Error = ServerError(err)
		return result
	}
	switch getter := entity.(type) {
	case status.StatusGetter:
		statusInfo, err := getter.Status()
		result.Status = statusInfo.Status
		result.Info = statusInfo.Message
		result.Data = statusInfo.Data
		result.Since = statusInfo.Since
		result.Error = ServerError(err)
	default:
		result.Error = ServerError(NotSupportedError(tag, fmt.Sprintf("getting status, %T", getter)))
	}
	return result
}