mirror of
https://github.com/ceph/ceph-csi.git
synced 2024-11-14 02:10:21 +00:00
323 lines
8.6 KiB
Go
323 lines
8.6 KiB
Go
/*
|
|
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 secret
|
|
|
|
import (
|
|
"fmt"
|
|
|
|
"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"
|
|
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{&secretPlugin{}}
|
|
}
|
|
|
|
const (
|
|
secretPluginName = "kubernetes.io/secret"
|
|
)
|
|
|
|
// secretPlugin implements the VolumePlugin interface.
|
|
type secretPlugin struct {
|
|
host volume.VolumeHost
|
|
getSecret func(namespace, name string) (*v1.Secret, error)
|
|
}
|
|
|
|
var _ volume.VolumePlugin = &secretPlugin{}
|
|
|
|
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, strings.EscapeQualifiedNameForDisk(secretPluginName), volName)
|
|
}
|
|
|
|
func (plugin *secretPlugin) Init(host volume.VolumeHost) error {
|
|
plugin.host = host
|
|
plugin.getSecret = host.GetSecretFunc()
|
|
return nil
|
|
}
|
|
|
|
func (plugin *secretPlugin) GetPluginName() string {
|
|
return secretPluginName
|
|
}
|
|
|
|
func (plugin *secretPlugin) GetVolumeName(spec *volume.Spec) (string, error) {
|
|
volumeSource, _ := getVolumeSource(spec)
|
|
if volumeSource == nil {
|
|
return "", fmt.Errorf("Spec does not reference a Secret volume type")
|
|
}
|
|
|
|
return volumeSource.SecretName, nil
|
|
}
|
|
|
|
func (plugin *secretPlugin) CanSupport(spec *volume.Spec) bool {
|
|
return spec.Volume != nil && spec.Volume.Secret != nil
|
|
}
|
|
|
|
func (plugin *secretPlugin) RequiresRemount() bool {
|
|
return true
|
|
}
|
|
|
|
func (plugin *secretPlugin) SupportsMountOption() bool {
|
|
return false
|
|
}
|
|
|
|
func (plugin *secretPlugin) SupportsBulkVolumeVerification() bool {
|
|
return false
|
|
}
|
|
|
|
func (plugin *secretPlugin) NewMounter(spec *volume.Spec, pod *v1.Pod, opts volume.VolumeOptions) (volume.Mounter, error) {
|
|
return &secretVolumeMounter{
|
|
secretVolume: &secretVolume{
|
|
spec.Name(),
|
|
pod.UID,
|
|
plugin,
|
|
plugin.host.GetMounter(plugin.GetPluginName()),
|
|
plugin.host.GetWriter(),
|
|
volume.NewCachedMetrics(volume.NewMetricsDu(getPath(pod.UID, spec.Name(), plugin.host))),
|
|
},
|
|
source: *spec.Volume.Secret,
|
|
pod: *pod,
|
|
opts: &opts,
|
|
getSecret: plugin.getSecret,
|
|
}, nil
|
|
}
|
|
|
|
func (plugin *secretPlugin) NewUnmounter(volName string, podUID types.UID) (volume.Unmounter, error) {
|
|
return &secretVolumeUnmounter{
|
|
&secretVolume{
|
|
volName,
|
|
podUID,
|
|
plugin,
|
|
plugin.host.GetMounter(plugin.GetPluginName()),
|
|
plugin.host.GetWriter(),
|
|
volume.NewCachedMetrics(volume.NewMetricsDu(getPath(podUID, volName, plugin.host))),
|
|
},
|
|
}, nil
|
|
}
|
|
|
|
func (plugin *secretPlugin) ConstructVolumeSpec(volName, mountPath string) (*volume.Spec, error) {
|
|
secretVolume := &v1.Volume{
|
|
Name: volName,
|
|
VolumeSource: v1.VolumeSource{
|
|
Secret: &v1.SecretVolumeSource{
|
|
SecretName: volName,
|
|
},
|
|
},
|
|
}
|
|
return volume.NewSpecFromVolume(secretVolume), nil
|
|
}
|
|
|
|
type secretVolume struct {
|
|
volName string
|
|
podUID types.UID
|
|
plugin *secretPlugin
|
|
mounter mount.Interface
|
|
writer ioutil.Writer
|
|
volume.MetricsProvider
|
|
}
|
|
|
|
var _ volume.Volume = &secretVolume{}
|
|
|
|
func (sv *secretVolume) GetPath() string {
|
|
return getPath(sv.podUID, sv.volName, sv.plugin.host)
|
|
}
|
|
|
|
// secretVolumeMounter handles retrieving secrets from the API server
|
|
// and placing them into the volume on the host.
|
|
type secretVolumeMounter struct {
|
|
*secretVolume
|
|
|
|
source v1.SecretVolumeSource
|
|
pod v1.Pod
|
|
opts *volume.VolumeOptions
|
|
getSecret func(namespace, name string) (*v1.Secret, error)
|
|
}
|
|
|
|
var _ volume.Mounter = &secretVolumeMounter{}
|
|
|
|
func (sv *secretVolume) 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 (b *secretVolumeMounter) CanMount() error {
|
|
return nil
|
|
}
|
|
|
|
func (b *secretVolumeMounter) SetUp(fsGroup *int64) error {
|
|
return b.SetUpAt(b.GetPath(), fsGroup)
|
|
}
|
|
|
|
func (b *secretVolumeMounter) 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
|
|
}
|
|
|
|
optional := b.source.Optional != nil && *b.source.Optional
|
|
secret, err := b.getSecret(b.pod.Namespace, b.source.SecretName)
|
|
if err != nil {
|
|
if !(errors.IsNotFound(err) && optional) {
|
|
glog.Errorf("Couldn't get secret %v/%v: %v", b.pod.Namespace, b.source.SecretName, err)
|
|
return err
|
|
}
|
|
secret = &v1.Secret{
|
|
ObjectMeta: metav1.ObjectMeta{
|
|
Namespace: b.pod.Namespace,
|
|
Name: b.source.SecretName,
|
|
},
|
|
}
|
|
}
|
|
|
|
if err := wrapped.SetUpAt(dir, fsGroup); err != nil {
|
|
return err
|
|
}
|
|
if err := volumeutil.MakeNestedMountpoints(b.volName, dir, b.pod); err != nil {
|
|
return err
|
|
}
|
|
|
|
totalBytes := totalSecretBytes(secret)
|
|
glog.V(3).Infof("Received secret %v/%v containing (%v) pieces of data, %v total bytes",
|
|
b.pod.Namespace,
|
|
b.source.SecretName,
|
|
len(secret.Data),
|
|
totalBytes)
|
|
|
|
payload, err := MakePayload(b.source.Items, secret, b.source.DefaultMode, optional)
|
|
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
|
|
}
|
|
|
|
// Note: this function is exported so that it can be called from the projection volume driver
|
|
func MakePayload(mappings []v1.KeyToPath, secret *v1.Secret, defaultMode *int32, optional bool) (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(secret.Data))
|
|
var fileProjection volumeutil.FileProjection
|
|
|
|
if len(mappings) == 0 {
|
|
for name, data := range secret.Data {
|
|
fileProjection.Data = []byte(data)
|
|
fileProjection.Mode = *defaultMode
|
|
payload[name] = fileProjection
|
|
}
|
|
} else {
|
|
for _, ktp := range mappings {
|
|
content, ok := secret.Data[ktp.Key]
|
|
if !ok {
|
|
if optional {
|
|
continue
|
|
}
|
|
err_msg := "references non-existent secret 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 totalSecretBytes(secret *v1.Secret) int {
|
|
totalSize := 0
|
|
for _, bytes := range secret.Data {
|
|
totalSize += len(bytes)
|
|
}
|
|
|
|
return totalSize
|
|
}
|
|
|
|
// secretVolumeUnmounter handles cleaning up secret volumes.
|
|
type secretVolumeUnmounter struct {
|
|
*secretVolume
|
|
}
|
|
|
|
var _ volume.Unmounter = &secretVolumeUnmounter{}
|
|
|
|
func (c *secretVolumeUnmounter) TearDown() error {
|
|
return c.TearDownAt(c.GetPath())
|
|
}
|
|
|
|
func (c *secretVolumeUnmounter) TearDownAt(dir string) error {
|
|
return volumeutil.UnmountViaEmptyDir(dir, c.plugin.host, c.volName, wrappedVolumeSpec(), c.podUID)
|
|
}
|
|
|
|
func getVolumeSource(spec *volume.Spec) (*v1.SecretVolumeSource, bool) {
|
|
var readOnly bool
|
|
var volumeSource *v1.SecretVolumeSource
|
|
|
|
if spec.Volume != nil && spec.Volume.Secret != nil {
|
|
volumeSource = spec.Volume.Secret
|
|
readOnly = spec.ReadOnly
|
|
}
|
|
|
|
return volumeSource, readOnly
|
|
}
|