283 lines
8 KiB
Go
283 lines
8 KiB
Go
/*
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Copyright 2015 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 configmap
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import (
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"fmt"
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"github.com/golang/glog"
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metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
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"k8s.io/apimachinery/pkg/types"
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"k8s.io/kubernetes/pkg/api/v1"
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ioutil "k8s.io/kubernetes/pkg/util/io"
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"k8s.io/kubernetes/pkg/util/mount"
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"k8s.io/kubernetes/pkg/util/strings"
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"k8s.io/kubernetes/pkg/volume"
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volumeutil "k8s.io/kubernetes/pkg/volume/util"
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)
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// ProbeVolumePlugin is the entry point for plugin detection in a package.
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func ProbeVolumePlugins() []volume.VolumePlugin {
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return []volume.VolumePlugin{&configMapPlugin{}}
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}
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const (
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configMapPluginName = "kubernetes.io/configmap"
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)
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// configMapPlugin implements the VolumePlugin interface.
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type configMapPlugin struct {
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host volume.VolumeHost
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}
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var _ volume.VolumePlugin = &configMapPlugin{}
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func (plugin *configMapPlugin) Init(host volume.VolumeHost) error {
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plugin.host = host
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return nil
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}
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func (plugin *configMapPlugin) GetPluginName() string {
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return configMapPluginName
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}
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func (plugin *configMapPlugin) GetVolumeName(spec *volume.Spec) (string, error) {
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volumeSource, _ := getVolumeSource(spec)
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if volumeSource == nil {
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return "", fmt.Errorf("Spec does not reference a ConfigMap volume type")
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}
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return fmt.Sprintf(
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"%v/%v",
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spec.Name(),
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volumeSource.Name), nil
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}
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func (plugin *configMapPlugin) CanSupport(spec *volume.Spec) bool {
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return spec.Volume != nil && spec.Volume.ConfigMap != nil
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}
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func (plugin *configMapPlugin) RequiresRemount() bool {
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return true
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}
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func (plugin *configMapPlugin) NewMounter(spec *volume.Spec, pod *v1.Pod, opts volume.VolumeOptions) (volume.Mounter, error) {
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return &configMapVolumeMounter{
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configMapVolume: &configMapVolume{spec.Name(), pod.UID, plugin, plugin.host.GetMounter(), plugin.host.GetWriter(), volume.MetricsNil{}},
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source: *spec.Volume.ConfigMap,
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pod: *pod,
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opts: &opts}, nil
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}
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func (plugin *configMapPlugin) NewUnmounter(volName string, podUID types.UID) (volume.Unmounter, error) {
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return &configMapVolumeUnmounter{&configMapVolume{volName, podUID, plugin, plugin.host.GetMounter(), plugin.host.GetWriter(), volume.MetricsNil{}}}, nil
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}
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func (plugin *configMapPlugin) ConstructVolumeSpec(volumeName, mountPath string) (*volume.Spec, error) {
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configMapVolume := &v1.Volume{
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Name: volumeName,
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VolumeSource: v1.VolumeSource{
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ConfigMap: &v1.ConfigMapVolumeSource{},
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},
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}
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return volume.NewSpecFromVolume(configMapVolume), nil
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}
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type configMapVolume struct {
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volName string
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podUID types.UID
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plugin *configMapPlugin
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mounter mount.Interface
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writer ioutil.Writer
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volume.MetricsNil
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}
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var _ volume.Volume = &configMapVolume{}
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func (sv *configMapVolume) GetPath() string {
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return sv.plugin.host.GetPodVolumeDir(sv.podUID, strings.EscapeQualifiedNameForDisk(configMapPluginName), sv.volName)
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}
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// configMapVolumeMounter handles retrieving secrets from the API server
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// and placing them into the volume on the host.
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type configMapVolumeMounter struct {
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*configMapVolume
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source v1.ConfigMapVolumeSource
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pod v1.Pod
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opts *volume.VolumeOptions
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}
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var _ volume.Mounter = &configMapVolumeMounter{}
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func (sv *configMapVolume) GetAttributes() volume.Attributes {
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return volume.Attributes{
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ReadOnly: true,
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Managed: true,
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SupportsSELinux: true,
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}
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}
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func wrappedVolumeSpec() volume.Spec {
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// This is the spec for the volume that this plugin wraps.
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return volume.Spec{
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// This should be on a tmpfs instead of the local disk; the problem is
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// charging the memory for the tmpfs to the right cgroup. We should make
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// this a tmpfs when we can do the accounting correctly.
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Volume: &v1.Volume{VolumeSource: v1.VolumeSource{EmptyDir: &v1.EmptyDirVolumeSource{}}},
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}
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}
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// Checks prior to mount operations to verify that the required components (binaries, etc.)
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// to mount the volume are available on the underlying node.
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// If not, it returns an error
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func (b *configMapVolumeMounter) CanMount() error {
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return nil
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}
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func (b *configMapVolumeMounter) SetUp(fsGroup *int64) error {
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return b.SetUpAt(b.GetPath(), fsGroup)
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}
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func (b *configMapVolumeMounter) SetUpAt(dir string, fsGroup *int64) error {
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glog.V(3).Infof("Setting up volume %v for pod %v at %v", b.volName, b.pod.UID, dir)
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// Wrap EmptyDir, let it do the setup.
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wrapped, err := b.plugin.host.NewWrapperMounter(b.volName, wrappedVolumeSpec(), &b.pod, *b.opts)
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if err != nil {
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return err
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}
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if err := wrapped.SetUpAt(dir, fsGroup); err != nil {
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return err
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}
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kubeClient := b.plugin.host.GetKubeClient()
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if kubeClient == nil {
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return fmt.Errorf("Cannot setup configMap volume %v because kube client is not configured", b.volName)
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}
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configMap, err := kubeClient.Core().ConfigMaps(b.pod.Namespace).Get(b.source.Name, metav1.GetOptions{})
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if err != nil {
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glog.Errorf("Couldn't get configMap %v/%v: %v", b.pod.Namespace, b.source.Name, err)
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return err
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}
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totalBytes := totalBytes(configMap)
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glog.V(3).Infof("Received configMap %v/%v containing (%v) pieces of data, %v total bytes",
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b.pod.Namespace,
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b.source.Name,
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len(configMap.Data),
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totalBytes)
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payload, err := makePayload(b.source.Items, configMap, b.source.DefaultMode)
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if err != nil {
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return err
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}
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writerContext := fmt.Sprintf("pod %v/%v volume %v", b.pod.Namespace, b.pod.Name, b.volName)
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writer, err := volumeutil.NewAtomicWriter(dir, writerContext)
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if err != nil {
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glog.Errorf("Error creating atomic writer: %v", err)
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return err
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}
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err = writer.Write(payload)
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if err != nil {
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glog.Errorf("Error writing payload to dir: %v", err)
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return err
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}
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err = volume.SetVolumeOwnership(b, fsGroup)
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if err != nil {
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glog.Errorf("Error applying volume ownership settings for group: %v", fsGroup)
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return err
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}
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return nil
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}
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func makePayload(mappings []v1.KeyToPath, configMap *v1.ConfigMap, defaultMode *int32) (map[string]volumeutil.FileProjection, error) {
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if defaultMode == nil {
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return nil, fmt.Errorf("No defaultMode used, not even the default value for it")
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}
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payload := make(map[string]volumeutil.FileProjection, len(configMap.Data))
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var fileProjection volumeutil.FileProjection
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if len(mappings) == 0 {
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for name, data := range configMap.Data {
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fileProjection.Data = []byte(data)
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fileProjection.Mode = *defaultMode
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payload[name] = fileProjection
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}
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} else {
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for _, ktp := range mappings {
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content, ok := configMap.Data[ktp.Key]
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if !ok {
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err_msg := "references non-existent config key"
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glog.Errorf(err_msg)
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return nil, fmt.Errorf(err_msg)
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}
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fileProjection.Data = []byte(content)
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if ktp.Mode != nil {
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fileProjection.Mode = *ktp.Mode
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} else {
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fileProjection.Mode = *defaultMode
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}
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payload[ktp.Path] = fileProjection
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}
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}
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return payload, nil
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}
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func totalBytes(configMap *v1.ConfigMap) int {
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totalSize := 0
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for _, value := range configMap.Data {
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totalSize += len(value)
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}
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return totalSize
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}
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// configMapVolumeUnmounter handles cleaning up configMap volumes.
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type configMapVolumeUnmounter struct {
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*configMapVolume
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}
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var _ volume.Unmounter = &configMapVolumeUnmounter{}
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func (c *configMapVolumeUnmounter) TearDown() error {
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return c.TearDownAt(c.GetPath())
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}
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func (c *configMapVolumeUnmounter) TearDownAt(dir string) error {
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return volume.UnmountViaEmptyDir(dir, c.plugin.host, c.volName, wrappedVolumeSpec(), c.podUID)
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}
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func getVolumeSource(spec *volume.Spec) (*v1.ConfigMapVolumeSource, bool) {
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var readOnly bool
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var volumeSource *v1.ConfigMapVolumeSource
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if spec.Volume != nil && spec.Volume.ConfigMap != nil {
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volumeSource = spec.Volume.ConfigMap
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readOnly = spec.ReadOnly
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}
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return volumeSource, readOnly
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}
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