mirror of https://github.com/k3s-io/k3s
121 lines
4.0 KiB
Go
121 lines
4.0 KiB
Go
/*
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Copyright 2017 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 mountpod
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import (
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"encoding/json"
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"fmt"
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"io/ioutil"
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"os"
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"path"
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"k8s.io/api/core/v1"
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"k8s.io/kubernetes/pkg/kubelet/config"
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kubepod "k8s.io/kubernetes/pkg/kubelet/pod"
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utilstrings "k8s.io/utils/strings"
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)
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// Manager is an interface that tracks pods with mount utilities for individual
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// volume plugins.
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type Manager interface {
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GetMountPod(pluginName string) (pod *v1.Pod, container string, err error)
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}
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// basicManager is simple implementation of Manager. Pods with mount utilities
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// are registered by placing a JSON file into
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// /var/lib/kubelet/plugin-containers/<plugin name>.json and this manager just
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// finds them there.
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type basicManager struct {
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registrationDirectory string
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podManager kubepod.Manager
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}
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// volumePluginRegistration specified format of the json files placed in
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// /var/lib/kubelet/plugin-containers/
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type volumePluginRegistration struct {
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PodName string `json:"podName"`
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PodNamespace string `json:"podNamespace"`
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PodUID string `json:"podUID"`
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ContainerName string `json:"containerName"`
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}
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// NewManager returns a new mount pod manager.
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func NewManager(rootDirectory string, podManager kubepod.Manager) (Manager, error) {
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regPath := path.Join(rootDirectory, config.DefaultKubeletPluginContainersDirName)
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// Create the directory on startup
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os.MkdirAll(regPath, 0700)
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return &basicManager{
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registrationDirectory: regPath,
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podManager: podManager,
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}, nil
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}
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func (m *basicManager) getVolumePluginRegistrationPath(pluginName string) string {
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// sanitize plugin name so it does not escape directory
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safePluginName := utilstrings.EscapeQualifiedName(pluginName) + ".json"
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return path.Join(m.registrationDirectory, safePluginName)
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}
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func (m *basicManager) GetMountPod(pluginName string) (pod *v1.Pod, containerName string, err error) {
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// Read /var/lib/kubelet/plugin-containers/<plugin name>.json
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regPath := m.getVolumePluginRegistrationPath(pluginName)
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regBytes, err := ioutil.ReadFile(regPath)
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if err != nil {
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if os.IsNotExist(err) {
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// No pod is registered for this plugin
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return nil, "", nil
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}
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return nil, "", fmt.Errorf("cannot read %s: %v", regPath, err)
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}
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// Parse json
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var reg volumePluginRegistration
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if err := json.Unmarshal(regBytes, ®); err != nil {
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return nil, "", fmt.Errorf("unable to parse %s: %s", regPath, err)
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}
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if len(reg.ContainerName) == 0 {
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return nil, "", fmt.Errorf("unable to parse %s: \"containerName\" is not set", regPath)
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}
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if len(reg.PodUID) == 0 {
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return nil, "", fmt.Errorf("unable to parse %s: \"podUID\" is not set", regPath)
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}
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if len(reg.PodNamespace) == 0 {
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return nil, "", fmt.Errorf("unable to parse %s: \"podNamespace\" is not set", regPath)
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}
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if len(reg.PodName) == 0 {
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return nil, "", fmt.Errorf("unable to parse %s: \"podName\" is not set", regPath)
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}
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pod, ok := m.podManager.GetPodByName(reg.PodNamespace, reg.PodName)
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if !ok {
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return nil, "", fmt.Errorf("unable to process %s: pod %s/%s not found", regPath, reg.PodNamespace, reg.PodName)
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}
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if string(pod.UID) != reg.PodUID {
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return nil, "", fmt.Errorf("unable to process %s: pod %s/%s has unexpected UID", regPath, reg.PodNamespace, reg.PodName)
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}
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// make sure that reg.ContainerName exists in the pod
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for i := range pod.Spec.Containers {
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if pod.Spec.Containers[i].Name == reg.ContainerName {
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return pod, reg.ContainerName, nil
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}
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}
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return nil, "", fmt.Errorf("unable to process %s: pod %s/%s has no container named %q", regPath, reg.PodNamespace, reg.PodName, reg.ContainerName)
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}
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