mirror of https://github.com/k3s-io/k3s
126 lines
3.2 KiB
Go
126 lines
3.2 KiB
Go
/*
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Copyright 2014 Google Inc. All rights reserved.
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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 empty_dir
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import (
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"fmt"
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"os"
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"github.com/GoogleCloudPlatform/kubernetes/pkg/api"
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"github.com/GoogleCloudPlatform/kubernetes/pkg/kubelet/volume"
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"github.com/GoogleCloudPlatform/kubernetes/pkg/types"
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"github.com/GoogleCloudPlatform/kubernetes/pkg/util"
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)
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// This is the primary entrypoint for volume plugins.
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func ProbeVolumePlugins() []volume.Plugin {
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return []volume.Plugin{&emptyDirPlugin{nil, false}, &emptyDirPlugin{nil, true}}
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}
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type emptyDirPlugin struct {
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host volume.Host
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legacyMode bool // if set, plugin answers to the legacy name
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}
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var _ volume.Plugin = &emptyDirPlugin{}
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const (
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emptyDirPluginName = "kubernetes.io/empty-dir"
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emptyDirPluginLegacyName = "empty"
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)
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func (plugin *emptyDirPlugin) Init(host volume.Host) {
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plugin.host = host
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}
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func (plugin *emptyDirPlugin) Name() string {
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if plugin.legacyMode {
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return emptyDirPluginLegacyName
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}
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return emptyDirPluginName
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}
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func (plugin *emptyDirPlugin) CanSupport(spec *api.Volume) bool {
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if plugin.legacyMode {
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// Legacy mode instances can be cleaned up but not created anew.
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return false
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}
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if util.AllPtrFieldsNil(&spec.Source) {
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return true
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}
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if spec.Source.EmptyDir != nil {
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return true
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}
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return false
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}
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func (plugin *emptyDirPlugin) NewBuilder(spec *api.Volume, podUID types.UID) (volume.Builder, error) {
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if plugin.legacyMode {
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// Legacy mode instances can be cleaned up but not created anew.
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return nil, fmt.Errorf("legacy mode: can not create new instances")
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}
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return &emptyDir{podUID, spec.Name, plugin, false}, nil
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}
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func (plugin *emptyDirPlugin) NewCleaner(volName string, podUID types.UID) (volume.Cleaner, error) {
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legacy := false
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if plugin.legacyMode {
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legacy = true
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}
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return &emptyDir{podUID, volName, plugin, legacy}, nil
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}
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// EmptyDir volumes are temporary directories exposed to the pod.
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// These do not persist beyond the lifetime of a pod.
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type emptyDir struct {
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podUID types.UID
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volName string
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plugin *emptyDirPlugin
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legacyMode bool
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}
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// SetUp creates new directory.
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func (ed *emptyDir) SetUp() error {
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if ed.legacyMode {
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return fmt.Errorf("legacy mode: can not create new instances")
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}
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path := ed.GetPath()
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return os.MkdirAll(path, 0750)
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}
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func (ed *emptyDir) GetPath() string {
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name := emptyDirPluginName
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if ed.legacyMode {
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name = emptyDirPluginLegacyName
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}
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return ed.plugin.host.GetPodVolumeDir(ed.podUID, volume.EscapePluginName(name), ed.volName)
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}
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// TearDown simply deletes everything in the directory.
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func (ed *emptyDir) TearDown() error {
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tmpDir, err := volume.RenameDirectory(ed.GetPath(), ed.volName+".deleting~")
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if err != nil {
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return err
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}
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err = os.RemoveAll(tmpDir)
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if err != nil {
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return err
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}
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return nil
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}
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