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

     1  /*
     2  Copyright 2017 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  
    22  	libvirtxml "github.com/libvirt/libvirt-go-xml"
    23  
    24  	"github.com/Mirantis/virtlet/pkg/metadata/types"
    25  	"github.com/Mirantis/virtlet/pkg/virt"
    26  )
    27  
    28  // rootVolume denotes the root disk of the VM
    29  type rootVolume struct {
    30  	volumeBase
    31  }
    32  
    33  var _ VMVolume = &rootVolume{}
    34  
    35  // GetRootVolume returns volume source for root volume clone.
    36  func GetRootVolume(config *types.VMConfig, owner volumeOwner) ([]VMVolume, error) {
    37  	var vol VMVolume
    38  	rootDev := config.RootVolumeDevice()
    39  	if rootDev != nil {
    40  		vol = &persistentRootVolume{
    41  			volumeBase: volumeBase{config, owner},
    42  			dev:        *rootDev,
    43  		}
    44  	} else {
    45  		vol = &rootVolume{
    46  			volumeBase{config, owner},
    47  		}
    48  	}
    49  	return []VMVolume{vol}, nil
    50  }
    51  
    52  func (v *rootVolume) volumeName() string {
    53  	return "virtlet_root_" + v.config.DomainUUID
    54  }
    55  
    56  func (v *rootVolume) createVolume() (virt.StorageVolume, error) {
    57  	imagePath, _, virtualSize, err := v.owner.ImageManager().GetImagePathDigestAndVirtualSize(v.config.Image)
    58  	if err != nil {
    59  		return nil, err
    60  	}
    61  
    62  	if v.config.ParsedAnnotations != nil && v.config.ParsedAnnotations.RootVolumeSize > 0 &&
    63  		uint64(v.config.ParsedAnnotations.RootVolumeSize) > virtualSize {
    64  		virtualSize = uint64(v.config.ParsedAnnotations.RootVolumeSize)
    65  	}
    66  
    67  	storagePool, err := v.owner.StoragePool()
    68  	if err != nil {
    69  		return nil, err
    70  	}
    71  	return storagePool.CreateStorageVol(&libvirtxml.StorageVolume{
    72  		Type: "file",
    73  		Name: v.volumeName(),
    74  		Allocation: &libvirtxml.StorageVolumeSize{
    75  			Unit:  "b",
    76  			Value: 0,
    77  		},
    78  		Capacity: &libvirtxml.StorageVolumeSize{
    79  			Unit:  "b",
    80  			Value: virtualSize,
    81  		},
    82  		Target: &libvirtxml.StorageVolumeTarget{
    83  			Format: &libvirtxml.StorageVolumeTargetFormat{Type: "qcow2"},
    84  		},
    85  		BackingStore: &libvirtxml.StorageVolumeBackingStore{
    86  			Path:   imagePath,
    87  			Format: &libvirtxml.StorageVolumeTargetFormat{Type: "qcow2"},
    88  		},
    89  	})
    90  }
    91  
    92  func (v *rootVolume) IsDisk() bool { return true }
    93  
    94  func (v *rootVolume) UUID() string { return "" }
    95  
    96  func (v *rootVolume) Setup() (*libvirtxml.DomainDisk, *libvirtxml.DomainFilesystem, error) {
    97  	vol, err := v.createVolume()
    98  	if err != nil {
    99  		return nil, nil, err
   100  	}
   101  
   102  	volPath, err := vol.Path()
   103  	if err != nil {
   104  		return nil, nil, fmt.Errorf("error getting root volume path: %v", err)
   105  	}
   106  
   107  	if len(v.config.ParsedAnnotations.InjectedFiles) > 0 {
   108  		if err := v.owner.StorageConnection().PutFiles(volPath, v.config.ParsedAnnotations.InjectedFiles); err != nil {
   109  			return nil, nil, fmt.Errorf("error adding files to rootfs: %v", err)
   110  		}
   111  	}
   112  
   113  	return &libvirtxml.DomainDisk{
   114  		Device: "disk",
   115  		Driver: &libvirtxml.DomainDiskDriver{Name: "qemu", Type: "qcow2"},
   116  		Source: &libvirtxml.DomainDiskSource{File: &libvirtxml.DomainDiskSourceFile{File: volPath}},
   117  	}, nil, nil
   118  }
   119  
   120  func (v *rootVolume) Teardown() error {
   121  	storagePool, err := v.owner.StoragePool()
   122  	if err != nil {
   123  		return err
   124  	}
   125  	return storagePool.RemoveVolumeByName(v.volumeName())
   126  }