213 lines
6.5 KiB
Go
213 lines
6.5 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 util
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import (
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"fmt"
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"os"
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"path"
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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/labels"
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"k8s.io/kubernetes/pkg/api/v1"
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v1helper "k8s.io/kubernetes/pkg/api/v1/helper"
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storage "k8s.io/kubernetes/pkg/apis/storage/v1"
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"k8s.io/kubernetes/pkg/client/clientset_generated/clientset"
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"k8s.io/kubernetes/pkg/util/mount"
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)
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const readyFileName = "ready"
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// IsReady checks for the existence of a regular file
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// called 'ready' in the given directory and returns
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// true if that file exists.
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func IsReady(dir string) bool {
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readyFile := path.Join(dir, readyFileName)
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s, err := os.Stat(readyFile)
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if err != nil {
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return false
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}
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if !s.Mode().IsRegular() {
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glog.Errorf("ready-file is not a file: %s", readyFile)
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return false
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}
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return true
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}
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// SetReady creates a file called 'ready' in the given
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// directory. It logs an error if the file cannot be
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// created.
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func SetReady(dir string) {
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if err := os.MkdirAll(dir, 0750); err != nil && !os.IsExist(err) {
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glog.Errorf("Can't mkdir %s: %v", dir, err)
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return
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}
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readyFile := path.Join(dir, readyFileName)
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file, err := os.Create(readyFile)
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if err != nil {
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glog.Errorf("Can't touch %s: %v", readyFile, err)
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return
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}
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file.Close()
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}
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// UnmountPath is a common unmount routine that unmounts the given path and
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// deletes the remaining directory if successful.
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func UnmountPath(mountPath string, mounter mount.Interface) error {
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return UnmountMountPoint(mountPath, mounter, false /* extensiveMountPointCheck */)
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}
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// UnmountMountPoint is a common unmount routine that unmounts the given path and
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// deletes the remaining directory if successful.
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// if extensiveMountPointCheck is true
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// IsNotMountPoint will be called instead of IsLikelyNotMountPoint.
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// IsNotMountPoint is more expensive but properly handles bind mounts.
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func UnmountMountPoint(mountPath string, mounter mount.Interface, extensiveMountPointCheck bool) error {
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if pathExists, pathErr := PathExists(mountPath); pathErr != nil {
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return fmt.Errorf("Error checking if path exists: %v", pathErr)
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} else if !pathExists {
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glog.Warningf("Warning: Unmount skipped because path does not exist: %v", mountPath)
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return nil
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}
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var notMnt bool
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var err error
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if extensiveMountPointCheck {
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notMnt, err = mount.IsNotMountPoint(mounter, mountPath)
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} else {
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notMnt, err = mounter.IsLikelyNotMountPoint(mountPath)
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}
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if err != nil {
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return err
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}
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if notMnt {
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glog.Warningf("Warning: %q is not a mountpoint, deleting", mountPath)
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return os.Remove(mountPath)
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}
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// Unmount the mount path
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glog.V(4).Infof("%q is a mountpoint, unmounting", mountPath)
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if err := mounter.Unmount(mountPath); err != nil {
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return err
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}
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notMnt, mntErr := mounter.IsLikelyNotMountPoint(mountPath)
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if mntErr != nil {
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return err
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}
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if notMnt {
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glog.V(4).Infof("%q is unmounted, deleting the directory", mountPath)
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return os.Remove(mountPath)
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}
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return fmt.Errorf("Failed to unmount path %v", mountPath)
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}
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// PathExists returns true if the specified path exists.
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func PathExists(path string) (bool, error) {
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_, err := os.Stat(path)
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if err == nil {
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return true, nil
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} else if os.IsNotExist(err) {
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return false, nil
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} else {
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return false, err
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}
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}
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// GetSecretForPod locates secret by name in the pod's namespace and returns secret map
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func GetSecretForPod(pod *v1.Pod, secretName string, kubeClient clientset.Interface) (map[string]string, error) {
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secret := make(map[string]string)
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if kubeClient == nil {
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return secret, fmt.Errorf("Cannot get kube client")
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}
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secrets, err := kubeClient.Core().Secrets(pod.Namespace).Get(secretName, metav1.GetOptions{})
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if err != nil {
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return secret, err
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}
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for name, data := range secrets.Data {
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secret[name] = string(data)
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}
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return secret, nil
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}
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// GetSecretForPV locates secret by name and namespace, verifies the secret type, and returns secret map
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func GetSecretForPV(secretNamespace, secretName, volumePluginName string, kubeClient clientset.Interface) (map[string]string, error) {
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secret := make(map[string]string)
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if kubeClient == nil {
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return secret, fmt.Errorf("Cannot get kube client")
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}
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secrets, err := kubeClient.Core().Secrets(secretNamespace).Get(secretName, metav1.GetOptions{})
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if err != nil {
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return secret, err
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}
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if secrets.Type != v1.SecretType(volumePluginName) {
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return secret, fmt.Errorf("Cannot get secret of type %s", volumePluginName)
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}
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for name, data := range secrets.Data {
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secret[name] = string(data)
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}
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return secret, nil
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}
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func GetClassForVolume(kubeClient clientset.Interface, pv *v1.PersistentVolume) (*storage.StorageClass, error) {
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if kubeClient == nil {
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return nil, fmt.Errorf("Cannot get kube client")
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}
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className := v1helper.GetPersistentVolumeClass(pv)
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if className == "" {
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return nil, fmt.Errorf("Volume has no storage class")
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}
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class, err := kubeClient.StorageV1().StorageClasses().Get(className, metav1.GetOptions{})
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if err != nil {
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return nil, err
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}
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return class, nil
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}
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// CheckNodeAffinity looks at the PV node affinity, and checks if the node has the same corresponding labels
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// This ensures that we don't mount a volume that doesn't belong to this node
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func CheckNodeAffinity(pv *v1.PersistentVolume, nodeLabels map[string]string) error {
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affinity, err := v1helper.GetStorageNodeAffinityFromAnnotation(pv.Annotations)
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if err != nil {
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return fmt.Errorf("Error getting storage node affinity: %v", err)
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}
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if affinity == nil {
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return nil
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}
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if affinity.RequiredDuringSchedulingIgnoredDuringExecution != nil {
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terms := affinity.RequiredDuringSchedulingIgnoredDuringExecution.NodeSelectorTerms
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glog.V(10).Infof("Match for RequiredDuringSchedulingIgnoredDuringExecution node selector terms %+v", terms)
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for _, term := range terms {
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selector, err := v1helper.NodeSelectorRequirementsAsSelector(term.MatchExpressions)
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if err != nil {
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return fmt.Errorf("Failed to parse MatchExpressions: %v", err)
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}
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if !selector.Matches(labels.Set(nodeLabels)) {
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return fmt.Errorf("NodeSelectorTerm %+v does not match node labels", term.MatchExpressions)
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}
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}
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}
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return nil
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}
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