Golang util.FileExists函數代碼示例

func (m *Master) generateSSHKey(user, privateKeyfile, publicKeyfile string) error {
	private, public, err := util.GenerateKey(2048)
	if err != nil {
		return err
	}
	// If private keyfile already exists, we must have only made it halfway
	// through last time, so delete it.
	exists, err := util.FileExists(privateKeyfile)
	if err != nil {
		glog.Errorf("Error detecting if private key exists: %v", err)
	} else if exists {
		glog.Infof("Private key exists, but public key does not")
		if err := os.Remove(privateKeyfile); err != nil {
			glog.Errorf("Failed to remove stale private key: %v", err)
		}
	}
	if err := ioutil.WriteFile(privateKeyfile, util.EncodePrivateKey(private), 0600); err != nil {
		return err
	}
	publicKeyBytes, err := util.EncodePublicKey(public)
	if err != nil {
		return err
	}
	if err := ioutil.WriteFile(publicKeyfile+".tmp", publicKeyBytes, 0600); err != nil {
		return err
	}
	return os.Rename(publicKeyfile+".tmp", publicKeyfile)
}

// init initializes master.
func (m *Master) init(c *Config) {
	healthzChecks := []healthz.HealthzChecker{}
	m.clock = util.RealClock{}
	podStorage := podetcd.NewStorage(c.DatabaseStorage, c.KubeletClient)
	podRegistry := pod.NewRegistry(podStorage.Pod)

	podTemplateStorage := podtemplateetcd.NewREST(c.DatabaseStorage)

	eventRegistry := event.NewEtcdRegistry(c.DatabaseStorage, uint64(c.EventTTL.Seconds()))
	limitRangeRegistry := limitrange.NewEtcdRegistry(c.DatabaseStorage)

	resourceQuotaStorage, resourceQuotaStatusStorage := resourcequotaetcd.NewStorage(c.DatabaseStorage)
	secretStorage := secretetcd.NewStorage(c.DatabaseStorage)
	serviceAccountStorage := serviceaccountetcd.NewStorage(c.DatabaseStorage)
	persistentVolumeStorage, persistentVolumeStatusStorage := pvetcd.NewStorage(c.DatabaseStorage)
	persistentVolumeClaimStorage, persistentVolumeClaimStatusStorage := pvcetcd.NewStorage(c.DatabaseStorage)

	namespaceStorage, namespaceStatusStorage, namespaceFinalizeStorage := namespaceetcd.NewStorage(c.DatabaseStorage)
	m.namespaceRegistry = namespace.NewRegistry(namespaceStorage)

	endpointsStorage := endpointsetcd.NewStorage(c.DatabaseStorage)
	m.endpointRegistry = endpoint.NewRegistry(endpointsStorage)

	nodeStorage, nodeStatusStorage := nodeetcd.NewStorage(c.DatabaseStorage, c.KubeletClient)
	m.nodeRegistry = minion.NewRegistry(nodeStorage)

	// TODO: split me up into distinct storage registries
	registry := etcd.NewRegistry(c.DatabaseStorage, podRegistry, m.endpointRegistry)
	m.serviceRegistry = registry

	var serviceClusterIPRegistry service.RangeRegistry
	serviceClusterIPAllocator := ipallocator.NewAllocatorCIDRRange(m.serviceClusterIPRange, func(max int, rangeSpec string) allocator.Interface {
		mem := allocator.NewAllocationMap(max, rangeSpec)
		etcd := etcdallocator.NewEtcd(mem, "/ranges/serviceips", "serviceipallocation", c.DatabaseStorage)
		serviceClusterIPRegistry = etcd
		return etcd
	})
	m.serviceClusterIPAllocator = serviceClusterIPRegistry

	var serviceNodePortRegistry service.RangeRegistry
	serviceNodePortAllocator := portallocator.NewPortAllocatorCustom(m.serviceNodePortRange, func(max int, rangeSpec string) allocator.Interface {
		mem := allocator.NewAllocationMap(max, rangeSpec)
		etcd := etcdallocator.NewEtcd(mem, "/ranges/servicenodeports", "servicenodeportallocation", c.DatabaseStorage)
		serviceNodePortRegistry = etcd
		return etcd
	})
	m.serviceNodePortAllocator = serviceNodePortRegistry

	controllerStorage := controlleretcd.NewREST(c.DatabaseStorage)

	// TODO: Factor out the core API registration
	m.storage = map[string]rest.Storage{
		"pods":             podStorage.Pod,
		"pods/status":      podStorage.Status,
		"pods/log":         podStorage.Log,
		"pods/exec":        podStorage.Exec,
		"pods/portforward": podStorage.PortForward,
		"pods/proxy":       podStorage.Proxy,
		"pods/binding":     podStorage.Binding,
		"bindings":         podStorage.Binding,

		"podTemplates": podTemplateStorage,

		"replicationControllers": controllerStorage,
		"services":               service.NewStorage(m.serviceRegistry, m.nodeRegistry, m.endpointRegistry, serviceClusterIPAllocator, serviceNodePortAllocator, c.ClusterName),
		"endpoints":              endpointsStorage,
		"nodes":                  nodeStorage,
		"nodes/status":           nodeStatusStorage,
		"events":                 event.NewStorage(eventRegistry),

		"limitRanges":                   limitrange.NewStorage(limitRangeRegistry),
		"resourceQuotas":                resourceQuotaStorage,
		"resourceQuotas/status":         resourceQuotaStatusStorage,
		"namespaces":                    namespaceStorage,
		"namespaces/status":             namespaceStatusStorage,
		"namespaces/finalize":           namespaceFinalizeStorage,
		"secrets":                       secretStorage,
		"serviceAccounts":               serviceAccountStorage,
		"persistentVolumes":             persistentVolumeStorage,
		"persistentVolumes/status":      persistentVolumeStatusStorage,
		"persistentVolumeClaims":        persistentVolumeClaimStorage,
		"persistentVolumeClaims/status": persistentVolumeClaimStatusStorage,

		"componentStatuses": componentstatus.NewStorage(func() map[string]apiserver.Server { return m.getServersToValidate(c) }),
	}

	// establish the node proxy dialer
	if len(c.SSHUser) > 0 {
		// Usernames are capped @ 32
		if len(c.SSHUser) > 32 {
			glog.Warning("SSH User is too long, truncating to 32 chars")
			c.SSHUser = c.SSHUser[0:32]
		}
		glog.Infof("Setting up proxy: %s %s", c.SSHUser, c.SSHKeyfile)

		// public keyfile is written last, so check for that.
		publicKeyFile := c.SSHKeyfile + ".pub"
		exists, err := util.FileExists(publicKeyFile)
		if err != nil {
//.........這裏部分代碼省略.........