github.com/Mirantis/virtlet@v1.5.2-0.20191204181327-1659b8a48e9b/pkg/libvirttools/raw_flexvolume.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  	"path/filepath"
    22  	"strings"
    23  
    24  	libvirtxml "github.com/libvirt/libvirt-go-xml"
    25  
    26  	"github.com/Mirantis/virtlet/pkg/metadata/types"
    27  	"github.com/Mirantis/virtlet/pkg/utils"
    28  )
    29  
    30  type rawVolumeOptions struct {
    31  	Path string `json:"path"`
    32  	UUID string `json:"uuid"`
    33  }
    34  
    35  func (vo *rawVolumeOptions) validate() error {
    36  	if !strings.HasPrefix(vo.Path, "/dev/") {
    37  		return fmt.Errorf("raw volume path needs to be prefixed by '/dev/', but it's whole value is: %s", vo.Path)
    38  	}
    39  	return nil
    40  }
    41  
    42  // rawDeviceVolume denotes a raw device that's made accessible for a VM
    43  type rawDeviceVolume struct {
    44  	volumeBase
    45  	opts *rawVolumeOptions
    46  }
    47  
    48  var _ VMVolume = &rawDeviceVolume{}
    49  
    50  func newRawDeviceVolume(volumeName, configPath string, config *types.VMConfig, owner volumeOwner) (VMVolume, error) {
    51  	var opts rawVolumeOptions
    52  	if err := utils.ReadJSON(configPath, &opts); err != nil {
    53  		return nil, fmt.Errorf("failed to parse raw volume config %q: %v", configPath, err)
    54  	}
    55  	if err := opts.validate(); err != nil {
    56  		return nil, err
    57  	}
    58  	return &rawDeviceVolume{
    59  		volumeBase: volumeBase{config, owner},
    60  		opts:       &opts,
    61  	}, nil
    62  }
    63  
    64  func (v *rawDeviceVolume) verifyRawDeviceWhitelisted(path string) error {
    65  	for _, deviceTemplate := range v.owner.RawDevices() {
    66  		matches, err := filepath.Match("/dev/"+deviceTemplate, path)
    67  		if err != nil {
    68  			return fmt.Errorf("bad raw device whitelist glob pattern '%s': %v", deviceTemplate, err)
    69  		}
    70  		if matches {
    71  			return nil
    72  		}
    73  	}
    74  	return fmt.Errorf("device '%s' not whitelisted on this virtlet node", path)
    75  }
    76  
    77  func (v *rawDeviceVolume) IsDisk() bool { return true }
    78  
    79  func (v *rawDeviceVolume) UUID() string {
    80  	return v.opts.UUID
    81  }
    82  
    83  func (v *rawDeviceVolume) Setup() (*libvirtxml.DomainDisk, *libvirtxml.DomainFilesystem, error) {
    84  	if err := v.verifyRawDeviceWhitelisted(v.opts.Path); err != nil {
    85  		return nil, nil, err
    86  	}
    87  
    88  	if err := verifyRawDeviceAccess(v.opts.Path); err != nil {
    89  		return nil, nil, err
    90  	}
    91  	return &libvirtxml.DomainDisk{
    92  		Device: "disk",
    93  		Source: &libvirtxml.DomainDiskSource{Block: &libvirtxml.DomainDiskSourceBlock{Dev: v.opts.Path}},
    94  		Driver: &libvirtxml.DomainDiskDriver{Name: "qemu", Type: "raw"},
    95  	}, nil, nil
    96  }
    97  
    98  func init() {
    99  	addFlexvolumeSource("raw", newRawDeviceVolume)
   100  }
   101  
   102  // TODO: this file needs a test