Golang Config.Tag方法代码示例

func openState(agentConfig agent.Config) (_ *state.State, _ *state.Machine, err error) {
	info, ok := agentConfig.StateInfo()
	if !ok {
		return nil, nil, fmt.Errorf("no state info available")
	}
	st, err := state.Open(info, state.DialOpts{}, environs.NewStatePolicy())
	if err != nil {
		return nil, nil, err
	}
	defer func() {
		if err != nil {
			st.Close()
		}
	}()
	m0, err := st.FindEntity(agentConfig.Tag())
	if err != nil {
		if errors.IsNotFound(err) {
			err = worker.ErrTerminateAgent
		}
		return nil, nil, err
	}
	m := m0.(*state.Machine)
	if m.Life() == state.Dead {
		return nil, nil, worker.ErrTerminateAgent
	}
	// Check the machine nonce as provisioned matches the agent.Conf value.
	if !m.CheckProvisioned(agentConfig.Nonce()) {
		// The agent is running on a different machine to the one it
		// should be according to state. It must stop immediately.
		logger.Errorf("running machine %v agent on inappropriate instance", m)
		return nil, nil, worker.ErrTerminateAgent
	}
	return st, m, nil
}

// NewUpgrader returns a new upgrader worker. It watches changes to the
// current version of the current agent (with the given tag) and tries to
// download the tools for any new version into the given data directory.  If
// an upgrade is needed, the worker will exit with an UpgradeReadyError
// holding details of the requested upgrade. The tools will have been
// downloaded and unpacked.
func NewUpgrader(st *upgrader.State, agentConfig agent.Config) *Upgrader {
	u := &Upgrader{
		st:      st,
		dataDir: agentConfig.DataDir(),
		tag:     agentConfig.Tag(),
	}
	go func() {
		defer u.tomb.Done()
		u.tomb.Kill(u.loop())
	}()
	return u
}

// NewMachineEnvironmentWorker returns a worker.Worker that uses the notify
// watcher returned from the setup.
func NewMachineEnvironmentWorker(api *environment.Facade, agentConfig agent.Config) worker.Worker {
	// We don't write out system files for the local provider on machine zero
	// as that is the host machine.
	writeSystemFiles := (agentConfig.Tag() != names.MachineTag("0") ||
		agentConfig.Value(agent.ProviderType) != provider.Local)
	logger.Debugf("write system files: %v", writeSystemFiles)
	envWorker := &MachineEnvironmentWorker{
		api:              api,
		writeSystemFiles: writeSystemFiles,
		first:            true,
	}
	return worker.NewNotifyWorker(envWorker)
}

// NewWorker returns a worker that keeps track of
// the machine's authorised ssh keys and ensures the
// ~/.ssh/authorized_keys file is up to date.
func NewWorker(st *keyupdater.State, agentConfig agent.Config) worker.Worker {
	kw := &keyupdaterWorker{st: st, tag: agentConfig.Tag()}
	return worker.NewNotifyWorker(kw)
}

func refreshConfig(c *gc.C, config agent.Config) agent.ConfigSetterWriter {
	config1, err := agent.ReadConfig(agent.ConfigPath(config.DataDir(), config.Tag()))
	c.Assert(err, gc.IsNil)
	return config1
}

// NewMachiner returns a Worker that will wait for the identified machine
// to become Dying and make it Dead; or until the machine becomes Dead by
// other means.
func NewMachiner(st *machiner.State, agentConfig agent.Config) worker.Worker {
	mr := &Machiner{st: st, tag: agentConfig.Tag()}
	return worker.NewNotifyWorker(mr)
}