mounter.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  	"os"
    21  	"strconv"
    22  
    23  	"k8s.io/kubernetes/pkg/volume"
    24  	"k8s.io/kubernetes/pkg/volume/util"
    25  	"k8s.io/utils/exec"
    26  )
    27  
    28  // FlexVolumeMounter is the disk that will be exposed by this plugin.
    29  type flexVolumeMounter struct {
    30  	*flexVolume
    31  	// Runner used to setup the volume.
    32  	runner exec.Interface
    33  	// the considered volume spec
    34  	spec     *volume.Spec
    35  	readOnly bool
    36  }
    37  
    38  var _ volume.Mounter = &flexVolumeMounter{}
    39  
    40  // Mounter interface
    41  
    42  // SetUp creates new directory.
    43  func (f *flexVolumeMounter) SetUp(mounterArgs volume.MounterArgs) error {
    44  	return f.SetUpAt(f.GetPath(), mounterArgs)
    45  }
    46  
    47  // SetUpAt creates new directory.
    48  func (f *flexVolumeMounter) SetUpAt(dir string, mounterArgs volume.MounterArgs) error {
    49  	// Mount only once.
    50  	alreadyMounted, err := prepareForMount(f.mounter, dir)
    51  	if err != nil {
    52  		return err
    53  	}
    54  	if alreadyMounted {
    55  		return nil
    56  	}
    57  
    58  	call := f.plugin.NewDriverCall(mountCmd)
    59  
    60  	// Interface parameters
    61  	call.Append(dir)
    62  
    63  	extraOptions := make(map[string]string)
    64  
    65  	// pod metadata
    66  	extraOptions[optionKeyPodName] = f.podName
    67  	extraOptions[optionKeyPodNamespace] = f.podNamespace
    68  	extraOptions[optionKeyPodUID] = string(f.podUID)
    69  	// service account metadata
    70  	extraOptions[optionKeyServiceAccountName] = f.podServiceAccountName
    71  
    72  	// Extract secret and pass it as options.
    73  	if err := addSecretsToOptions(extraOptions, f.spec, f.podNamespace, f.driverName, f.plugin.host); err != nil {
    74  		os.Remove(dir)
    75  		return err
    76  	}
    77  
    78  	// Implicit parameters
    79  	if mounterArgs.FsGroup != nil {
    80  		extraOptions[optionFSGroup] = strconv.FormatInt(int64(*mounterArgs.FsGroup), 10)
    81  	}
    82  
    83  	call.AppendSpec(f.spec, f.plugin.host, extraOptions)
    84  
    85  	_, err = call.Run()
    86  	if isCmdNotSupportedErr(err) {
    87  		err = (*mounterDefaults)(f).SetUpAt(dir, mounterArgs)
    88  	}
    89  
    90  	if err != nil {
    91  		os.Remove(dir)
    92  		return err
    93  	}
    94  
    95  	if !f.readOnly {
    96  		if f.plugin.capabilities.FSGroup {
    97  			// fullPluginName helps to distinguish different driver from flex volume plugin
    98  			volume.SetVolumeOwnership(f, dir, mounterArgs.FsGroup, mounterArgs.FSGroupChangePolicy, util.FSGroupCompleteHook(f.plugin, f.spec))
    99  		}
   100  	}
   101  
   102  	return nil
   103  }
   104  
   105  // GetAttributes get the flex volume attributes. The attributes will be queried
   106  // using plugin callout after we finalize the callout syntax.
   107  func (f *flexVolumeMounter) GetAttributes() volume.Attributes {
   108  	return (*mounterDefaults)(f).GetAttributes()
   109  }
   110
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