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configmap.go
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configmap.go
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/*
Copyright 2015 The Kubernetes Authors All rights reserved.
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) Name() string {
return configMapPluginName
}
func (plugin *configMapPlugin) CanSupport(spec *volume.Spec) bool {
return spec.Volume != nil && spec.Volume.ConfigMap != nil
}
func (plugin *configMapPlugin) NewBuilder(spec *volume.Spec, pod *api.Pod, opts volume.VolumeOptions) (volume.Builder, error) {
return &configMapVolumeBuilder{
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) NewCleaner(volName string, podUID types.UID) (volume.Cleaner, error) {
return &configMapVolumeCleaner{&configMapVolume{volName, podUID, plugin, plugin.host.GetMounter(), plugin.host.GetWriter(), volume.MetricsNil{}}}, 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)
}
// configMapVolumeBuilder handles retrieving secrets from the API server
// and placing them into the volume on the host.
type configMapVolumeBuilder struct {
*configMapVolume
source api.ConfigMapVolumeSource
pod api.Pod
opts *volume.VolumeOptions
}
var _ volume.Builder = &configMapVolumeBuilder{}
func (sv *configMapVolume) GetAttributes() volume.Attributes {
return volume.Attributes{
ReadOnly: true,
Managed: true,
SupportsSELinux: true,
}
}
// This is the spec for the volume that this plugin wraps.
var wrappedVolumeSpec = volume.Spec{
Volume: &api.Volume{VolumeSource: api.VolumeSource{EmptyDir: &api.EmptyDirVolumeSource{Medium: api.StorageMediumMemory}}},
}
func (b *configMapVolumeBuilder) SetUp(fsGroup *int64) error {
return b.SetUpAt(b.GetPath(), fsGroup)
}
func (b *configMapVolumeBuilder) 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.NewWrapperBuilder(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)
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) (map[string][]byte, error) {
payload := make(map[string][]byte, len(configMap.Data))
if len(mappings) == 0 {
for name, data := range configMap.Data {
payload[name] = []byte(data)
}
} else {
for _, ktp := range mappings {
content, ok := configMap.Data[ktp.Key]
if !ok {
glog.Errorf("references non-existent config key")
return nil, fmt.Errorf("references non-existent config key")
}
payload[ktp.Path] = []byte(content)
}
}
return payload, nil
}
func totalBytes(configMap *api.ConfigMap) int {
totalSize := 0
for _, value := range configMap.Data {
totalSize += len(value)
}
return totalSize
}
// configMapVolumeCleaner handles cleaning up configMap volumes.
type configMapVolumeCleaner struct {
*configMapVolume
}
var _ volume.Cleaner = &configMapVolumeCleaner{}
func (c *configMapVolumeCleaner) TearDown() error {
return c.TearDownAt(c.GetPath())
}
func (c *configMapVolumeCleaner) 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.NewWrapperCleaner(c.volName, wrappedVolumeSpec, c.podUID)
if err != nil {
return err
}
return wrapped.TearDownAt(dir)
}