unmounter.go

Documentation: k8s.io/kubernetes/pkg/volume/flexvolume

     1  /*
     2  Copyright 2017 The Kubernetes Authors.
     3  
     4  Licensed under the Apache License, Version 2.0 (the "License");
     5  you may not use this file except in compliance with the License.
     6  You may obtain a copy of the License at
     7  
     8      http://www.apache.org/licenses/LICENSE-2.0
     9  
    10  Unless required by applicable law or agreed to in writing, software
    11  distributed under the License is distributed on an "AS IS" BASIS,
    12  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    13  See the License for the specific language governing permissions and
    14  limitations under the License.
    15  */
    16  
    17  package flexvolume
    18  
    19  import (
    20  	"fmt"
    21  	"os"
    22  
    23  	"k8s.io/klog/v2"
    24  	"k8s.io/mount-utils"
    25  	"k8s.io/utils/exec"
    26  
    27  	"k8s.io/kubernetes/pkg/volume"
    28  )
    29  
    30  // FlexVolumeUnmounter is the disk that will be cleaned by this plugin.
    31  type flexVolumeUnmounter struct {
    32  	*flexVolume
    33  	// Runner used to teardown the volume.
    34  	runner exec.Interface
    35  }
    36  
    37  var _ volume.Unmounter = &flexVolumeUnmounter{}
    38  
    39  // Unmounter interface
    40  func (f *flexVolumeUnmounter) TearDown() error {
    41  	path := f.GetPath()
    42  	return f.TearDownAt(path)
    43  }
    44  
    45  func (f *flexVolumeUnmounter) TearDownAt(dir string) error {
    46  	pathExists, pathErr := mount.PathExists(dir)
    47  	if pathErr != nil {
    48  		// only log warning here since plugins should anyways have to deal with errors
    49  		klog.Warningf("Error checking path: %v", pathErr)
    50  	} else {
    51  		if !pathExists {
    52  			klog.Warningf("Warning: Unmount skipped because path does not exist: %v", dir)
    53  			return nil
    54  		}
    55  	}
    56  
    57  	call := f.plugin.NewDriverCall(unmountCmd)
    58  	call.Append(dir)
    59  	_, err := call.Run()
    60  	if isCmdNotSupportedErr(err) {
    61  		err = (*unmounterDefaults)(f).TearDownAt(dir)
    62  	}
    63  	if err != nil {
    64  		return err
    65  	}
    66  
    67  	// Flexvolume driver may remove the directory. Ignore if it does.
    68  	if pathExists, pathErr := mount.PathExists(dir); pathErr != nil {
    69  		return fmt.Errorf("error checking if path exists: %w", pathErr)
    70  	} else if !pathExists {
    71  		return nil
    72  	}
    73  	return os.Remove(dir)
    74  }
    75
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