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configmap.go
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configmap.go
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/*
Copyright 2015 The Kubernetes Authors.
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
package configmap
import (
"fmt"
"github.com/golang/glog"
"k8s.io/kubernetes/pkg/api"
"k8s.io/kubernetes/pkg/types"
ioutil "k8s.io/kubernetes/pkg/util/io"
"k8s.io/kubernetes/pkg/util/mount"
"k8s.io/kubernetes/pkg/util/strings"
"k8s.io/kubernetes/pkg/volume"
volumeutil "k8s.io/kubernetes/pkg/volume/util"
)
// ProbeVolumePlugin is the entry point for plugin detection in a package.
func ProbeVolumePlugins() []volume.VolumePlugin {
return []volume.VolumePlugin{&configMapPlugin{}}
}
const (
configMapPluginName = "kubernetes.io/configmap"
)
// configMapPlugin implements the VolumePlugin interface.
type configMapPlugin struct {
host volume.VolumeHost
}
var _ volume.VolumePlugin = &configMapPlugin{}
func (plugin *configMapPlugin) Init(host volume.VolumeHost) error {
plugin.host = host
return nil
}
func (plugin *configMapPlugin) GetPluginName() string {
return configMapPluginName
}
func (plugin *configMapPlugin) GetVolumeName(spec *volume.Spec) (string, error) {
volumeSource, _ := getVolumeSource(spec)
if volumeSource == nil {
return "", fmt.Errorf("Spec does not reference a ConfigMap volume type")
}
return fmt.Sprintf(
"%v/%v",
spec.Name(),
volumeSource.Name), nil
}
func (plugin *configMapPlugin) CanSupport(spec *volume.Spec) bool {
return spec.Volume != nil && spec.Volume.ConfigMap != nil
}
func (plugin *configMapPlugin) RequiresRemount() bool {
return true
}
func (plugin *configMapPlugin) NewMounter(spec *volume.Spec, pod *api.Pod, opts volume.VolumeOptions) (volume.Mounter, error) {
return &configMapVolumeMounter{
configMapVolume: &configMapVolume{spec.Name(), pod.UID, plugin, plugin.host.GetMounter(), plugin.host.GetWriter(), volume.MetricsNil{}},
source: *spec.Volume.ConfigMap,
pod: *pod,
opts: &opts}, nil
}
func (plugin *configMapPlugin) NewUnmounter(volName string, podUID types.UID) (volume.Unmounter, error) {
return &configMapVolumeUnmounter{&configMapVolume{volName, podUID, plugin, plugin.host.GetMounter(), plugin.host.GetWriter(), volume.MetricsNil{}}}, nil
}
func (plugin *configMapPlugin) ConstructVolumeSpec(volumeName, mountPath string) (*volume.Spec, error) {
configMapVolume := &api.Volume{
Name: volumeName,
VolumeSource: api.VolumeSource{
ConfigMap: &api.ConfigMapVolumeSource{},
},
}
return volume.NewSpecFromVolume(configMapVolume), nil
}
type configMapVolume struct {
volName string
podUID types.UID
plugin *configMapPlugin
mounter mount.Interface
writer ioutil.Writer
volume.MetricsNil
}
var _ volume.Volume = &configMapVolume{}
func (sv *configMapVolume) GetPath() string {
return sv.plugin.host.GetPodVolumeDir(sv.podUID, strings.EscapeQualifiedNameForDisk(configMapPluginName), sv.volName)
}
// configMapVolumeMounter handles retrieving secrets from the API server
// and placing them into the volume on the host.
type configMapVolumeMounter struct {
*configMapVolume
source api.ConfigMapVolumeSource
pod api.Pod
opts *volume.VolumeOptions
}
var _ volume.Mounter = &configMapVolumeMounter{}
func (sv *configMapVolume) GetAttributes() volume.Attributes {
return volume.Attributes{
ReadOnly: true,
Managed: true,
SupportsSELinux: true,
}
}
func wrappedVolumeSpec() volume.Spec {
// This is the spec for the volume that this plugin wraps.
return volume.Spec{
// This should be on a tmpfs instead of the local disk; the problem is
// charging the memory for the tmpfs to the right cgroup. We should make
// this a tmpfs when we can do the accounting correctly.
Volume: &api.Volume{VolumeSource: api.VolumeSource{EmptyDir: &api.EmptyDirVolumeSource{}}},
}
}
func (b *configMapVolumeMounter) SetUp(fsGroup *int64) error {
return b.SetUpAt(b.GetPath(), fsGroup)
}
func (b *configMapVolumeMounter) SetUpAt(dir string, fsGroup *int64) error {
glog.V(3).Infof("Setting up volume %v for pod %v at %v", b.volName, b.pod.UID, dir)
// Wrap EmptyDir, let it do the setup.
wrapped, err := b.plugin.host.NewWrapperMounter(b.volName, wrappedVolumeSpec(), &b.pod, *b.opts)
if err != nil {
return err
}
if err := wrapped.SetUpAt(dir, fsGroup); err != nil {
return err
}
kubeClient := b.plugin.host.GetKubeClient()
if kubeClient == nil {
return fmt.Errorf("Cannot setup configMap volume %v because kube client is not configured", b.volName)
}
configMap, err := kubeClient.Core().ConfigMaps(b.pod.Namespace).Get(b.source.Name)
if err != nil {
glog.Errorf("Couldn't get configMap %v/%v: %v", b.pod.Namespace, b.source.Name, err)
return err
}
totalBytes := totalBytes(configMap)
glog.V(3).Infof("Received configMap %v/%v containing (%v) pieces of data, %v total bytes",
b.pod.Namespace,
b.source.Name,
len(configMap.Data),
totalBytes)
payload, err := makePayload(b.source.Items, configMap, b.source.DefaultMode)
if err != nil {
return err
}
writerContext := fmt.Sprintf("pod %v/%v volume %v", b.pod.Namespace, b.pod.Name, b.volName)
writer, err := volumeutil.NewAtomicWriter(dir, writerContext)
if err != nil {
glog.Errorf("Error creating atomic writer: %v", err)
return err
}
err = writer.Write(payload)
if err != nil {
glog.Errorf("Error writing payload to dir: %v", err)
return err
}
err = volume.SetVolumeOwnership(b, fsGroup)
if err != nil {
glog.Errorf("Error applying volume ownership settings for group: %v", fsGroup)
return err
}
return nil
}
func makePayload(mappings []api.KeyToPath, configMap *api.ConfigMap, defaultMode *int32) (map[string]volumeutil.FileProjection, error) {
if defaultMode == nil {
return nil, fmt.Errorf("No defaultMode used, not even the default value for it")
}
payload := make(map[string]volumeutil.FileProjection, len(configMap.Data))
var fileProjection volumeutil.FileProjection
if len(mappings) == 0 {
for name, data := range configMap.Data {
fileProjection.Data = []byte(data)
fileProjection.Mode = *defaultMode
payload[name] = fileProjection
}
} else {
for _, ktp := range mappings {
content, ok := configMap.Data[ktp.Key]
if !ok {
err_msg := "references non-existent config key"
glog.Errorf(err_msg)
return nil, fmt.Errorf(err_msg)
}
fileProjection.Data = []byte(content)
if ktp.Mode != nil {
fileProjection.Mode = *ktp.Mode
} else {
fileProjection.Mode = *defaultMode
}
payload[ktp.Path] = fileProjection
}
}
return payload, nil
}
func totalBytes(configMap *api.ConfigMap) int {
totalSize := 0
for _, value := range configMap.Data {
totalSize += len(value)
}
return totalSize
}
// configMapVolumeUnmounter handles cleaning up configMap volumes.
type configMapVolumeUnmounter struct {
*configMapVolume
}
var _ volume.Unmounter = &configMapVolumeUnmounter{}
func (c *configMapVolumeUnmounter) TearDown() error {
return c.TearDownAt(c.GetPath())
}
func (c *configMapVolumeUnmounter) TearDownAt(dir string) error {
glog.V(3).Infof("Tearing down volume %v for pod %v at %v", c.volName, c.podUID, dir)
// Wrap EmptyDir, let it do the teardown.
wrapped, err := c.plugin.host.NewWrapperUnmounter(c.volName, wrappedVolumeSpec(), c.podUID)
if err != nil {
return err
}
return wrapped.TearDownAt(dir)
}
func getVolumeSource(spec *volume.Spec) (*api.ConfigMapVolumeSource, bool) {
var readOnly bool
var volumeSource *api.ConfigMapVolumeSource
if spec.Volume != nil && spec.Volume.ConfigMap != nil {
volumeSource = spec.Volume.ConfigMap
readOnly = spec.ReadOnly
}
return volumeSource, readOnly
}