k3s/pkg/volume/fc/attacher.go

/*
Copyright 2017 The Kubernetes Authors.

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

    http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/

package fc

import (
	"fmt"
	"os"
	"strconv"
	"time"

	"github.com/golang/glog"
	"k8s.io/apimachinery/pkg/types"
	"k8s.io/kubernetes/pkg/util/mount"
	"k8s.io/kubernetes/pkg/volume"
	volumeutil "k8s.io/kubernetes/pkg/volume/util"
	"k8s.io/utils/exec"
)

type fcAttacher struct {
	host    volume.VolumeHost
	manager diskManager
	exe     exec.Interface
}

var _ volume.Attacher = &fcAttacher{}

var _ volume.AttachableVolumePlugin = &fcPlugin{}

func (plugin *fcPlugin) NewAttacher() (volume.Attacher, error) {
	return &fcAttacher{
		host:    plugin.host,
		manager: &FCUtil{},
		exe:     exec.New(),
	}, nil
}

func (plugin *fcPlugin) GetDeviceMountRefs(deviceMountPath string) ([]string, error) {
	mounter := plugin.host.GetMounter()
	return mount.GetMountRefs(mounter, deviceMountPath)
}

func (attacher *fcAttacher) Attach(spec *volume.Spec, nodeName types.NodeName) (string, error) {
	return "", nil
}

func (attacher *fcAttacher) VolumesAreAttached(specs []*volume.Spec, nodeName types.NodeName) (map[*volume.Spec]bool, error) {
	volumesAttachedCheck := make(map[*volume.Spec]bool)
	for _, spec := range specs {
		volumesAttachedCheck[spec] = true
	}

	return volumesAttachedCheck, nil
}

func (attacher *fcAttacher) WaitForAttach(spec *volume.Spec, devicePath string, timeout time.Duration) (string, error) {
	mounter, err := volumeSpecToMounter(spec, attacher.host)
	if err != nil {
		glog.Warningf("failed to get fc mounter: %v", err)
		return "", err
	}
	return attacher.manager.AttachDisk(*mounter)
}

func (attacher *fcAttacher) GetDeviceMountPath(
	spec *volume.Spec) (string, error) {
	mounter, err := volumeSpecToMounter(spec, attacher.host)
	if err != nil {
		glog.Warningf("failed to get fc mounter: %v", err)
		return "", err
	}

	return attacher.manager.MakeGlobalPDName(*mounter.fcDisk), nil
}

func (attacher *fcAttacher) MountDevice(spec *volume.Spec, devicePath string, deviceMountPath string) error {
	mounter := attacher.host.GetMounter()
	notMnt, err := mounter.IsLikelyNotMountPoint(deviceMountPath)
	if err != nil {
		if os.IsNotExist(err) {
			if err := os.MkdirAll(deviceMountPath, 0750); err != nil {
				return err
			}
			notMnt = true
		} else {
			return err
		}
	}

	volumeSource, readOnly, err := getVolumeSource(spec)
	if err != nil {
		return err
	}

	options := []string{}
	if readOnly {
		options = append(options, "ro")
	}
	if notMnt {
		diskMounter := &mount.SafeFormatAndMount{Interface: mounter, Runner: exec.New()}
		mountOptions := volume.MountOptionFromSpec(spec, options...)
		err = diskMounter.FormatAndMount(devicePath, deviceMountPath, volumeSource.FSType, mountOptions)
		if err != nil {
			os.Remove(deviceMountPath)
			return err
		}
	}
	return nil
}

type fcDetacher struct {
	mounter mount.Interface
	manager diskManager
	exe     exec.Interface
}

var _ volume.Detacher = &fcDetacher{}

func (plugin *fcPlugin) NewDetacher() (volume.Detacher, error) {
	return &fcDetacher{
		mounter: plugin.host.GetMounter(),
		manager: &FCUtil{},
		exe:     exec.New(),
	}, nil
}

func (detacher *fcDetacher) Detach(deviceMountPath string, nodeName types.NodeName) error {
	return nil
}

func (detacher *fcDetacher) UnmountDevice(deviceMountPath string) error {
	return volumeutil.UnmountPath(deviceMountPath, detacher.mounter)
}

func volumeSpecToMounter(spec *volume.Spec, host volume.VolumeHost) (*fcDiskMounter, error) {
	fc, readOnly, err := getVolumeSource(spec)
	if err != nil {
		return nil, err
	}
	if fc.Lun == nil {
		return nil, fmt.Errorf("empty lun")
	}
	lun := strconv.Itoa(int(*fc.Lun))
	return &fcDiskMounter{
		fcDisk: &fcDisk{
			plugin: &fcPlugin{
				host: host,
			},
			wwns: fc.TargetWWNs,
			lun:  lun,
			io:   &osIOHandler{},
		},
		fsType:   fc.FSType,
		readOnly: readOnly,
		mounter:  &mount.SafeFormatAndMount{Interface: host.GetMounter(), Runner: exec.New()},
	}, nil
}