be7da5052f
This patch refactors pkg/util/mount to be more usable outside of Kubernetes. This is done by refactoring mount.Interface to only contain methods that are not K8s specific. Methods that are not relevant to basic mount activities but still have OS-specific implementations are now found in a mount.HostUtils interface.
343 lines
11 KiB
Go
343 lines
11 KiB
Go
/*
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Copyright 2016 The Kubernetes Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package kubelet
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import (
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"fmt"
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"net"
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"runtime"
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"k8s.io/klog"
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authenticationv1 "k8s.io/api/authentication/v1"
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"k8s.io/api/core/v1"
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"k8s.io/apimachinery/pkg/types"
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"k8s.io/apimachinery/pkg/util/wait"
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utilfeature "k8s.io/apiserver/pkg/util/feature"
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"k8s.io/client-go/informers"
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clientset "k8s.io/client-go/kubernetes"
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storagelisters "k8s.io/client-go/listers/storage/v1beta1"
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"k8s.io/client-go/tools/cache"
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"k8s.io/client-go/tools/record"
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cloudprovider "k8s.io/cloud-provider"
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"k8s.io/kubernetes/pkg/features"
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"k8s.io/kubernetes/pkg/kubelet/configmap"
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"k8s.io/kubernetes/pkg/kubelet/container"
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"k8s.io/kubernetes/pkg/kubelet/mountpod"
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"k8s.io/kubernetes/pkg/kubelet/secret"
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"k8s.io/kubernetes/pkg/kubelet/token"
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"k8s.io/kubernetes/pkg/util/mount"
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"k8s.io/kubernetes/pkg/volume"
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"k8s.io/kubernetes/pkg/volume/util"
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execmnt "k8s.io/kubernetes/pkg/volume/util/exec"
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"k8s.io/kubernetes/pkg/volume/util/subpath"
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)
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// NewInitializedVolumePluginMgr returns a new instance of
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// volume.VolumePluginMgr initialized with kubelets implementation of the
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// volume.VolumeHost interface.
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//
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// kubelet - used by VolumeHost methods to expose kubelet specific parameters
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// plugins - used to initialize volumePluginMgr
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func NewInitializedVolumePluginMgr(
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kubelet *Kubelet,
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secretManager secret.Manager,
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configMapManager configmap.Manager,
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tokenManager *token.Manager,
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plugins []volume.VolumePlugin,
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prober volume.DynamicPluginProber) (*volume.VolumePluginMgr, error) {
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// Initialize csiDriverLister before calling InitPlugins
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var informerFactory informers.SharedInformerFactory
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var csiDriverLister storagelisters.CSIDriverLister
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var csiDriversSynced cache.InformerSynced
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const resyncPeriod = 0
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if utilfeature.DefaultFeatureGate.Enabled(features.CSIDriverRegistry) {
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// Don't initialize if kubeClient is nil
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if kubelet.kubeClient != nil {
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informerFactory = informers.NewSharedInformerFactory(kubelet.kubeClient, resyncPeriod)
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csiDriverInformer := informerFactory.Storage().V1beta1().CSIDrivers()
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csiDriverLister = csiDriverInformer.Lister()
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csiDriversSynced = csiDriverInformer.Informer().HasSynced
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} else {
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klog.Warning("kubeClient is nil. Skip initialization of CSIDriverLister")
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}
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}
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mountPodManager, err := mountpod.NewManager(kubelet.getRootDir(), kubelet.podManager)
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if err != nil {
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return nil, err
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}
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kvh := &kubeletVolumeHost{
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kubelet: kubelet,
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volumePluginMgr: volume.VolumePluginMgr{},
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secretManager: secretManager,
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configMapManager: configMapManager,
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tokenManager: tokenManager,
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mountPodManager: mountPodManager,
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informerFactory: informerFactory,
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csiDriverLister: csiDriverLister,
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csiDriversSynced: csiDriversSynced,
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}
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if err := kvh.volumePluginMgr.InitPlugins(plugins, prober, kvh); err != nil {
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return nil, fmt.Errorf(
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"Could not initialize volume plugins for KubeletVolumePluginMgr: %v",
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err)
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}
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return &kvh.volumePluginMgr, nil
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}
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// Compile-time check to ensure kubeletVolumeHost implements the VolumeHost interface
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var _ volume.VolumeHost = &kubeletVolumeHost{}
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var _ volume.KubeletVolumeHost = &kubeletVolumeHost{}
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func (kvh *kubeletVolumeHost) GetPluginDir(pluginName string) string {
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return kvh.kubelet.getPluginDir(pluginName)
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}
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type kubeletVolumeHost struct {
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kubelet *Kubelet
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volumePluginMgr volume.VolumePluginMgr
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secretManager secret.Manager
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tokenManager *token.Manager
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configMapManager configmap.Manager
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mountPodManager mountpod.Manager
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informerFactory informers.SharedInformerFactory
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csiDriverLister storagelisters.CSIDriverLister
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csiDriversSynced cache.InformerSynced
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}
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func (kvh *kubeletVolumeHost) SetKubeletError(err error) {
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kvh.kubelet.runtimeState.setStorageState(err)
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}
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func (kvh *kubeletVolumeHost) GetVolumeDevicePluginDir(pluginName string) string {
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return kvh.kubelet.getVolumeDevicePluginDir(pluginName)
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}
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func (kvh *kubeletVolumeHost) GetPodsDir() string {
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return kvh.kubelet.getPodsDir()
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}
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func (kvh *kubeletVolumeHost) GetPodVolumeDir(podUID types.UID, pluginName string, volumeName string) string {
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dir := kvh.kubelet.getPodVolumeDir(podUID, pluginName, volumeName)
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if runtime.GOOS == "windows" {
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dir = util.GetWindowsPath(dir)
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}
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return dir
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}
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func (kvh *kubeletVolumeHost) GetPodVolumeDeviceDir(podUID types.UID, pluginName string) string {
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return kvh.kubelet.getPodVolumeDeviceDir(podUID, pluginName)
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}
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func (kvh *kubeletVolumeHost) GetPodPluginDir(podUID types.UID, pluginName string) string {
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return kvh.kubelet.getPodPluginDir(podUID, pluginName)
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}
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func (kvh *kubeletVolumeHost) GetKubeClient() clientset.Interface {
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return kvh.kubelet.kubeClient
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}
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func (kvh *kubeletVolumeHost) GetSubpather() subpath.Interface {
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return kvh.kubelet.subpather
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}
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func (kvh *kubeletVolumeHost) GetHostUtil() mount.HostUtils {
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return kvh.kubelet.hostutil
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}
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func (kvh *kubeletVolumeHost) GetInformerFactory() informers.SharedInformerFactory {
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return kvh.informerFactory
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}
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func (kvh *kubeletVolumeHost) CSIDriverLister() storagelisters.CSIDriverLister {
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return kvh.csiDriverLister
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}
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func (kvh *kubeletVolumeHost) CSIDriversSynced() cache.InformerSynced {
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return kvh.csiDriversSynced
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}
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// WaitForCacheSync is a helper function that waits for cache sync for CSIDriverLister
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func (kvh *kubeletVolumeHost) WaitForCacheSync() error {
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if kvh.csiDriversSynced == nil {
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klog.Error("csiDriversSynced not found on KubeletVolumeHost")
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return fmt.Errorf("csiDriversSynced not found on KubeletVolumeHost")
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}
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synced := []cache.InformerSynced{kvh.csiDriversSynced}
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if !cache.WaitForCacheSync(wait.NeverStop, synced...) {
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klog.Warning("failed to wait for cache sync for CSIDriverLister")
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return fmt.Errorf("failed to wait for cache sync for CSIDriverLister")
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}
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return nil
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}
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func (kvh *kubeletVolumeHost) NewWrapperMounter(
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volName string,
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spec volume.Spec,
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pod *v1.Pod,
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opts volume.VolumeOptions) (volume.Mounter, error) {
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// The name of wrapper volume is set to "wrapped_{wrapped_volume_name}"
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wrapperVolumeName := "wrapped_" + volName
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if spec.Volume != nil {
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spec.Volume.Name = wrapperVolumeName
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}
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return kvh.kubelet.newVolumeMounterFromPlugins(&spec, pod, opts)
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}
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func (kvh *kubeletVolumeHost) NewWrapperUnmounter(volName string, spec volume.Spec, podUID types.UID) (volume.Unmounter, error) {
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// The name of wrapper volume is set to "wrapped_{wrapped_volume_name}"
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wrapperVolumeName := "wrapped_" + volName
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if spec.Volume != nil {
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spec.Volume.Name = wrapperVolumeName
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}
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plugin, err := kvh.kubelet.volumePluginMgr.FindPluginBySpec(&spec)
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if err != nil {
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return nil, err
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}
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return plugin.NewUnmounter(spec.Name(), podUID)
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}
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func (kvh *kubeletVolumeHost) GetCloudProvider() cloudprovider.Interface {
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return kvh.kubelet.cloud
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}
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func (kvh *kubeletVolumeHost) GetMounter(pluginName string) mount.Interface {
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exec, err := kvh.getMountExec(pluginName)
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if err != nil {
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klog.V(2).Infof("Error finding mount pod for plugin %s: %s", pluginName, err.Error())
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// Use the default mounter
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exec = nil
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}
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if exec == nil {
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return kvh.kubelet.mounter
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}
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return execmnt.NewExecMounter(exec, kvh.kubelet.mounter)
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}
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func (kvh *kubeletVolumeHost) GetHostName() string {
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return kvh.kubelet.hostname
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}
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func (kvh *kubeletVolumeHost) GetHostIP() (net.IP, error) {
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return kvh.kubelet.GetHostIP()
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}
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func (kvh *kubeletVolumeHost) GetNodeAllocatable() (v1.ResourceList, error) {
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node, err := kvh.kubelet.getNodeAnyWay()
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if err != nil {
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return nil, fmt.Errorf("error retrieving node: %v", err)
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}
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return node.Status.Allocatable, nil
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}
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func (kvh *kubeletVolumeHost) GetSecretFunc() func(namespace, name string) (*v1.Secret, error) {
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return kvh.secretManager.GetSecret
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}
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func (kvh *kubeletVolumeHost) GetConfigMapFunc() func(namespace, name string) (*v1.ConfigMap, error) {
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return kvh.configMapManager.GetConfigMap
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}
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func (kvh *kubeletVolumeHost) GetServiceAccountTokenFunc() func(namespace, name string, tr *authenticationv1.TokenRequest) (*authenticationv1.TokenRequest, error) {
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return kvh.tokenManager.GetServiceAccountToken
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}
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func (kvh *kubeletVolumeHost) DeleteServiceAccountTokenFunc() func(podUID types.UID) {
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return kvh.tokenManager.DeleteServiceAccountToken
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}
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func (kvh *kubeletVolumeHost) GetNodeLabels() (map[string]string, error) {
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node, err := kvh.kubelet.GetNode()
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if err != nil {
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return nil, fmt.Errorf("error retrieving node: %v", err)
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}
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return node.Labels, nil
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}
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func (kvh *kubeletVolumeHost) GetNodeName() types.NodeName {
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return kvh.kubelet.nodeName
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}
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func (kvh *kubeletVolumeHost) GetEventRecorder() record.EventRecorder {
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return kvh.kubelet.recorder
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}
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func (kvh *kubeletVolumeHost) GetExec(pluginName string) mount.Exec {
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exec, err := kvh.getMountExec(pluginName)
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if err != nil {
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klog.V(2).Infof("Error finding mount pod for plugin %s: %s", pluginName, err.Error())
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// Use the default exec
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exec = nil
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}
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if exec == nil {
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return mount.NewOsExec()
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}
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return exec
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}
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// getMountExec returns mount.Exec implementation that leads to pod with mount
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// utilities. It returns nil,nil when there is no such pod and default mounter /
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// os.Exec should be used.
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func (kvh *kubeletVolumeHost) getMountExec(pluginName string) (mount.Exec, error) {
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if !utilfeature.DefaultFeatureGate.Enabled(features.MountContainers) {
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klog.V(5).Infof("using default mounter/exec for %s", pluginName)
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return nil, nil
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}
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pod, container, err := kvh.mountPodManager.GetMountPod(pluginName)
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if err != nil {
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return nil, err
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}
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if pod == nil {
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// Use default mounter/exec for this plugin
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klog.V(5).Infof("using default mounter/exec for %s", pluginName)
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return nil, nil
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}
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klog.V(5).Infof("using container %s/%s/%s to execute mount utilities for %s", pod.Namespace, pod.Name, container, pluginName)
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return &containerExec{
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pod: pod,
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containerName: container,
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kl: kvh.kubelet,
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}, nil
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}
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// containerExec is implementation of mount.Exec that executes commands in given
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// container in given pod.
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type containerExec struct {
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pod *v1.Pod
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containerName string
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kl *Kubelet
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}
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var _ mount.Exec = &containerExec{}
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func (e *containerExec) Run(cmd string, args ...string) ([]byte, error) {
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cmdline := append([]string{cmd}, args...)
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klog.V(5).Infof("Exec mounter running in pod %s/%s/%s: %v", e.pod.Namespace, e.pod.Name, e.containerName, cmdline)
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return e.kl.RunInContainer(container.GetPodFullName(e.pod), e.pod.UID, e.containerName, cmdline)
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}
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