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iscsi.go
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iscsi.go
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/*
Copyright 2015 The Kubernetes Authors All rights reserved.
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 iscsi
import (
"strconv"
"strings"
"github.com/golang/glog"
"k8s.io/kubernetes/pkg/api"
"k8s.io/kubernetes/pkg/types"
"k8s.io/kubernetes/pkg/util"
"k8s.io/kubernetes/pkg/util/exec"
"k8s.io/kubernetes/pkg/util/mount"
"k8s.io/kubernetes/pkg/volume"
)
// This is the primary entrypoint for volume plugins.
func ProbeVolumePlugins() []volume.VolumePlugin {
return []volume.VolumePlugin{&iscsiPlugin{nil, exec.New()}}
}
type iscsiPlugin struct {
host volume.VolumeHost
exe exec.Interface
}
var _ volume.VolumePlugin = &iscsiPlugin{}
var _ volume.PersistentVolumePlugin = &iscsiPlugin{}
const (
iscsiPluginName = "kubernetes.io/iscsi"
)
func (plugin *iscsiPlugin) Init(host volume.VolumeHost) {
plugin.host = host
}
func (plugin *iscsiPlugin) Name() string {
return iscsiPluginName
}
func (plugin *iscsiPlugin) CanSupport(spec *volume.Spec) bool {
if (spec.Volume != nil && spec.Volume.ISCSI == nil) || (spec.PersistentVolume != nil && spec.PersistentVolume.Spec.ISCSI == nil) {
return false
}
// TODO: turn this into a func so CanSupport can be unit tested without
// having to make system calls
// see if iscsiadm is there
_, err := plugin.execCommand("iscsiadm", []string{"-h"})
if err == nil {
return true
}
return false
}
func (plugin *iscsiPlugin) GetAccessModes() []api.PersistentVolumeAccessMode {
return []api.PersistentVolumeAccessMode{
api.ReadWriteOnce,
api.ReadOnlyMany,
}
}
func (plugin *iscsiPlugin) NewBuilder(spec *volume.Spec, pod *api.Pod, _ volume.VolumeOptions) (volume.Builder, error) {
// Inject real implementations here, test through the internal function.
return plugin.newBuilderInternal(spec, pod.UID, &ISCSIUtil{}, plugin.host.GetMounter())
}
func (plugin *iscsiPlugin) newBuilderInternal(spec *volume.Spec, podUID types.UID, manager diskManager, mounter mount.Interface) (volume.Builder, error) {
// iscsi volumes used directly in a pod have a ReadOnly flag set by the pod author.
// iscsi volumes used as a PersistentVolume gets the ReadOnly flag indirectly through the persistent-claim volume used to mount the PV
var readOnly bool
var iscsi *api.ISCSIVolumeSource
if spec.Volume != nil && spec.Volume.ISCSI != nil {
iscsi = spec.Volume.ISCSI
readOnly = iscsi.ReadOnly
} else {
iscsi = spec.PersistentVolume.Spec.ISCSI
readOnly = spec.ReadOnly
}
lun := strconv.Itoa(iscsi.Lun)
portal := portalBuilder(iscsi.TargetPortal)
return &iscsiDiskBuilder{
iscsiDisk: &iscsiDisk{
podUID: podUID,
volName: spec.Name(),
portal: portal,
iqn: iscsi.IQN,
lun: lun,
manager: manager,
mounter: &mount.SafeFormatAndMount{mounter, exec.New()},
plugin: plugin},
fsType: iscsi.FSType,
readOnly: readOnly,
}, nil
}
func (plugin *iscsiPlugin) NewCleaner(volName string, podUID types.UID) (volume.Cleaner, error) {
// Inject real implementations here, test through the internal function.
return plugin.newCleanerInternal(volName, podUID, &ISCSIUtil{}, plugin.host.GetMounter())
}
func (plugin *iscsiPlugin) newCleanerInternal(volName string, podUID types.UID, manager diskManager, mounter mount.Interface) (volume.Cleaner, error) {
return &iscsiDiskCleaner{&iscsiDisk{
podUID: podUID,
volName: volName,
manager: manager,
mounter: mounter,
plugin: plugin,
}}, nil
}
func (plugin *iscsiPlugin) execCommand(command string, args []string) ([]byte, error) {
cmd := plugin.exe.Command(command, args...)
return cmd.CombinedOutput()
}
type iscsiDisk struct {
volName string
podUID types.UID
portal string
iqn string
lun string
plugin *iscsiPlugin
mounter mount.Interface
// Utility interface that provides API calls to the provider to attach/detach disks.
manager diskManager
}
func (iscsi *iscsiDisk) GetPath() string {
name := iscsiPluginName
// safe to use PodVolumeDir now: volume teardown occurs before pod is cleaned up
return iscsi.plugin.host.GetPodVolumeDir(iscsi.podUID, util.EscapeQualifiedNameForDisk(name), iscsi.volName)
}
type iscsiDiskBuilder struct {
*iscsiDisk
readOnly bool
fsType string
}
var _ volume.Builder = &iscsiDiskBuilder{}
func (b *iscsiDiskBuilder) SetUp() error {
return b.SetUpAt(b.GetPath())
}
func (b *iscsiDiskBuilder) SetUpAt(dir string) error {
// diskSetUp checks mountpoints and prevent repeated calls
err := diskSetUp(b.manager, *b, dir, b.mounter)
if err != nil {
glog.Errorf("iscsi: failed to setup")
}
return err
}
type iscsiDiskCleaner struct {
*iscsiDisk
}
var _ volume.Cleaner = &iscsiDiskCleaner{}
func (b *iscsiDiskBuilder) IsReadOnly() bool {
return b.readOnly
}
// Unmounts the bind mount, and detaches the disk only if the disk
// resource was the last reference to that disk on the kubelet.
func (c *iscsiDiskCleaner) TearDown() error {
return c.TearDownAt(c.GetPath())
}
func (c *iscsiDiskCleaner) TearDownAt(dir string) error {
return diskTearDown(c.manager, *c, dir, c.mounter)
}
func portalBuilder(portal string) string {
if !strings.Contains(portal, ":") {
portal = portal + ":3260"
}
return portal
}