github.com/mirantis/virtlet@v1.5.2-0.20191204181327-1659b8a48e9b/pkg/libvirttools/filesystemvolume.go (about)

     1  /*
     2  Copyright 2018 Mirantis
     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 libvirttools
    18  
    19  import (
    20  	"fmt"
    21  	"os"
    22  	"path"
    23  
    24  	libvirtxml "github.com/libvirt/libvirt-go-xml"
    25  
    26  	"github.com/Mirantis/virtlet/pkg/metadata/types"
    27  )
    28  
    29  // filesystemVolume denotes the filesystem mount of the VM
    30  type filesystemVolume struct {
    31  	volumeBase
    32  	mount            types.VMMount
    33  	volumeMountPoint string
    34  	chownRecursively bool
    35  }
    36  
    37  var _ VMVolume = &filesystemVolume{}
    38  
    39  func (v *filesystemVolume) IsDisk() bool { return false }
    40  
    41  func (v *filesystemVolume) UUID() string { return "" }
    42  
    43  func (v *filesystemVolume) Setup() (*libvirtxml.DomainDisk, *libvirtxml.DomainFilesystem, error) {
    44  	fsys := v.owner.FileSystem()
    45  	err := os.MkdirAll(v.volumeMountPoint, 0777)
    46  	if err == nil {
    47  		err = fsys.ChownForEmulator(v.volumeMountPoint, false)
    48  	}
    49  	if err == nil {
    50  		err = fsys.Mount(v.mount.HostPath, v.volumeMountPoint, "bind", true)
    51  	}
    52  	if err == nil {
    53  		err = fsys.ChownForEmulator(v.volumeMountPoint, v.chownRecursively)
    54  	}
    55  	if err != nil {
    56  		return nil, nil, fmt.Errorf("failed to create vm pod path %q: %v", v.volumeMountPoint, err)
    57  	}
    58  
    59  	fsDef := &libvirtxml.DomainFilesystem{
    60  		AccessMode: "squash",
    61  		Source:     &libvirtxml.DomainFilesystemSource{Mount: &libvirtxml.DomainFilesystemSourceMount{Dir: v.volumeMountPoint}},
    62  		Target:     &libvirtxml.DomainFilesystemTarget{Dir: path.Base(v.mount.ContainerPath)},
    63  	}
    64  
    65  	return nil, fsDef, nil
    66  }
    67  
    68  func (v *filesystemVolume) Teardown() error {
    69  	var err error
    70  	if _, err = os.Stat(v.volumeMountPoint); err == nil {
    71  		err = v.owner.FileSystem().Unmount(v.volumeMountPoint, true)
    72  	}
    73  	if err == nil {
    74  		err = os.Remove(v.volumeMountPoint)
    75  	}
    76  	if err != nil {
    77  		return fmt.Errorf("failed to tear down fs volume mountpoint '%s': %v", v.volumeMountPoint, err)
    78  	}
    79  	return nil
    80  }