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projected.go
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projected.go
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/*
Copyright 2017 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 projected
import (
"fmt"
"sort"
"strings"
"github.com/golang/glog"
"k8s.io/api/core/v1"
"k8s.io/apimachinery/pkg/api/errors"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/types"
utilerrors "k8s.io/apimachinery/pkg/util/errors"
utilstrings "k8s.io/kubernetes/pkg/util/strings"
"k8s.io/kubernetes/pkg/volume"
"k8s.io/kubernetes/pkg/volume/configmap"
"k8s.io/kubernetes/pkg/volume/downwardapi"
"k8s.io/kubernetes/pkg/volume/secret"
volumeutil "k8s.io/kubernetes/pkg/volume/util"
)
// ProbeVolumePlugins is the entry point for plugin detection in a package.
func ProbeVolumePlugins() []volume.VolumePlugin {
return []volume.VolumePlugin{&projectedPlugin{}}
}
const (
projectedPluginName = "kubernetes.io/projected"
)
type projectedPlugin struct {
host volume.VolumeHost
getSecret func(namespace, name string) (*v1.Secret, error)
getConfigMap func(namespace, name string) (*v1.ConfigMap, error)
}
var _ volume.VolumePlugin = &projectedPlugin{}
func wrappedVolumeSpec() volume.Spec {
return volume.Spec{
Volume: &v1.Volume{
VolumeSource: v1.VolumeSource{
EmptyDir: &v1.EmptyDirVolumeSource{Medium: v1.StorageMediumMemory},
},
},
}
}
func getPath(uid types.UID, volName string, host volume.VolumeHost) string {
return host.GetPodVolumeDir(uid, utilstrings.EscapeQualifiedNameForDisk(projectedPluginName), volName)
}
func (plugin *projectedPlugin) Init(host volume.VolumeHost) error {
plugin.host = host
plugin.getSecret = host.GetSecretFunc()
plugin.getConfigMap = host.GetConfigMapFunc()
return nil
}
func (plugin *projectedPlugin) GetPluginName() string {
return projectedPluginName
}
func (plugin *projectedPlugin) GetVolumeName(spec *volume.Spec) (string, error) {
_, _, err := getVolumeSource(spec)
if err != nil {
return "", err
}
return spec.Name(), nil
}
func (plugin *projectedPlugin) CanSupport(spec *volume.Spec) bool {
return spec.Volume != nil && spec.Volume.Projected != nil
}
func (plugin *projectedPlugin) RequiresRemount() bool {
return true
}
func (plugin *projectedPlugin) SupportsMountOption() bool {
return false
}
func (plugin *projectedPlugin) SupportsBulkVolumeVerification() bool {
return false
}
func (plugin *projectedPlugin) NewMounter(spec *volume.Spec, pod *v1.Pod, opts volume.VolumeOptions) (volume.Mounter, error) {
return &projectedVolumeMounter{
projectedVolume: &projectedVolume{
volName: spec.Name(),
sources: spec.Volume.Projected.Sources,
podUID: pod.UID,
plugin: plugin,
},
source: *spec.Volume.Projected,
pod: pod,
opts: &opts,
}, nil
}
func (plugin *projectedPlugin) NewUnmounter(volName string, podUID types.UID) (volume.Unmounter, error) {
return &projectedVolumeUnmounter{
&projectedVolume{
volName: volName,
podUID: podUID,
plugin: plugin,
},
}, nil
}
func (plugin *projectedPlugin) ConstructVolumeSpec(volumeName, mountPath string) (*volume.Spec, error) {
projectedVolume := &v1.Volume{
Name: volumeName,
VolumeSource: v1.VolumeSource{
Projected: &v1.ProjectedVolumeSource{},
},
}
return volume.NewSpecFromVolume(projectedVolume), nil
}
type projectedVolume struct {
volName string
sources []v1.VolumeProjection
podUID types.UID
plugin *projectedPlugin
volume.MetricsNil
}
var _ volume.Volume = &projectedVolume{}
func (sv *projectedVolume) GetPath() string {
return getPath(sv.podUID, sv.volName, sv.plugin.host)
}
type projectedVolumeMounter struct {
*projectedVolume
source v1.ProjectedVolumeSource
pod *v1.Pod
opts *volume.VolumeOptions
}
var _ volume.Mounter = &projectedVolumeMounter{}
func (sv *projectedVolume) GetAttributes() volume.Attributes {
return volume.Attributes{
ReadOnly: true,
Managed: true,
SupportsSELinux: true,
}
}
// Checks prior to mount operations to verify that the required components (binaries, etc.)
// to mount the volume are available on the underlying node.
// If not, it returns an error
func (s *projectedVolumeMounter) CanMount() error {
return nil
}
func (s *projectedVolumeMounter) SetUp(fsGroup *int64) error {
return s.SetUpAt(s.GetPath(), fsGroup)
}
func (s *projectedVolumeMounter) SetUpAt(dir string, fsGroup *int64) error {
glog.V(3).Infof("Setting up volume %v for pod %v at %v", s.volName, s.pod.UID, dir)
wrapped, err := s.plugin.host.NewWrapperMounter(s.volName, wrappedVolumeSpec(), s.pod, *s.opts)
if err != nil {
return err
}
if err := wrapped.SetUpAt(dir, fsGroup); err != nil {
return err
}
if err := volumeutil.MakeNestedMountpoints(s.volName, dir, *s.pod); err != nil {
return err
}
data, err := s.collectData()
if err != nil {
glog.Errorf("Error preparing data for projected volume %v for pod %v/%v: %s", s.volName, s.pod.Namespace, s.pod.Name, err.Error())
return err
}
writerContext := fmt.Sprintf("pod %v/%v volume %v", s.pod.Namespace, s.pod.Name, s.volName)
writer, err := volumeutil.NewAtomicWriter(dir, writerContext)
if err != nil {
glog.Errorf("Error creating atomic writer: %v", err)
return err
}
err = writer.Write(data)
if err != nil {
glog.Errorf("Error writing payload to dir: %v", err)
return err
}
err = volume.SetVolumeOwnership(s, fsGroup)
if err != nil {
glog.Errorf("Error applying volume ownership settings for group: %v", fsGroup)
return err
}
return nil
}
func (s *projectedVolumeMounter) collectData() (map[string]volumeutil.FileProjection, error) {
if s.source.DefaultMode == nil {
return nil, fmt.Errorf("No defaultMode used, not even the default value for it")
}
kubeClient := s.plugin.host.GetKubeClient()
if kubeClient == nil {
return nil, fmt.Errorf("Cannot setup projected volume %v because kube client is not configured", s.volName)
}
errlist := []error{}
payload := make(map[string]volumeutil.FileProjection)
for _, source := range s.source.Sources {
if source.Secret != nil {
optional := source.Secret.Optional != nil && *source.Secret.Optional
secretapi, err := s.plugin.getSecret(s.pod.Namespace, source.Secret.Name)
if err != nil {
if !(errors.IsNotFound(err) && optional) {
glog.Errorf("Couldn't get secret %v/%v: %v", s.pod.Namespace, source.Secret.Name, err)
errlist = append(errlist, err)
continue
}
secretapi = &v1.Secret{
ObjectMeta: metav1.ObjectMeta{
Namespace: s.pod.Namespace,
Name: source.Secret.Name,
},
}
}
secretPayload, err := secret.MakePayload(source.Secret.Items, secretapi, s.source.DefaultMode, optional)
if err != nil {
glog.Errorf("Couldn't get secret payload %v/%v: %v", s.pod.Namespace, source.Secret.Name, err)
errlist = append(errlist, err)
continue
}
for k, v := range secretPayload {
payload[k] = v
}
} else if source.ConfigMap != nil {
optional := source.ConfigMap.Optional != nil && *source.ConfigMap.Optional
configMap, err := s.plugin.getConfigMap(s.pod.Namespace, source.ConfigMap.Name)
if err != nil {
if !(errors.IsNotFound(err) && optional) {
glog.Errorf("Couldn't get configMap %v/%v: %v", s.pod.Namespace, source.ConfigMap.Name, err)
errlist = append(errlist, err)
continue
}
configMap = &v1.ConfigMap{
ObjectMeta: metav1.ObjectMeta{
Namespace: s.pod.Namespace,
Name: source.ConfigMap.Name,
},
}
}
configMapPayload, err := configmap.MakePayload(source.ConfigMap.Items, configMap, s.source.DefaultMode, optional)
if err != nil {
glog.Errorf("Couldn't get configMap payload %v/%v: %v", s.pod.Namespace, source.ConfigMap.Name, err)
errlist = append(errlist, err)
continue
}
for k, v := range configMapPayload {
payload[k] = v
}
} else if source.DownwardAPI != nil {
downwardAPIPayload, err := downwardapi.CollectData(source.DownwardAPI.Items, s.pod, s.plugin.host, s.source.DefaultMode)
if err != nil {
errlist = append(errlist, err)
continue
}
for k, v := range downwardAPIPayload {
payload[k] = v
}
}
}
return payload, utilerrors.NewAggregate(errlist)
}
func sortLines(values string) string {
splitted := strings.Split(values, "\n")
sort.Strings(splitted)
return strings.Join(splitted, "\n")
}
type projectedVolumeUnmounter struct {
*projectedVolume
}
var _ volume.Unmounter = &projectedVolumeUnmounter{}
func (c *projectedVolumeUnmounter) TearDown() error {
return c.TearDownAt(c.GetPath())
}
func (c *projectedVolumeUnmounter) TearDownAt(dir string) error {
glog.V(3).Infof("Tearing down volume %v for pod %v at %v", c.volName, c.podUID, dir)
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) (*v1.ProjectedVolumeSource, bool, error) {
var readOnly bool
var volumeSource *v1.ProjectedVolumeSource
if spec.Volume != nil && spec.Volume.Projected != nil {
volumeSource = spec.Volume.Projected
readOnly = spec.ReadOnly
}
return volumeSource, readOnly, fmt.Errorf("Spec does not reference a projected volume type")
}