/
node.go
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/
node.go
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/*
* Copyright 2021, 2022, 2024 Hewlett Packard Enterprise Development LP
* Other additional copyright holders may be indicated within.
*
* The entirety of this work is 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 service
import (
"os"
"strings"
log "github.com/sirupsen/logrus"
"golang.org/x/net/context"
"google.golang.org/grpc/codes"
"google.golang.org/grpc/status"
mount "k8s.io/mount-utils"
"github.com/container-storage-interface/spec/lib/go/csi"
)
func (s *service) NodeStageVolume(
ctx context.Context,
req *csi.NodeStageVolumeRequest) (
*csi.NodeStageVolumeResponse, error) {
return nil, nil
}
func (s *service) NodeUnstageVolume(
ctx context.Context,
req *csi.NodeUnstageVolumeRequest) (
*csi.NodeUnstageVolumeResponse, error) {
return nil, nil
}
func (s *service) NodePublishVolume(
ctx context.Context,
req *csi.NodePublishVolumeRequest) (
*csi.NodePublishVolumeResponse, error) {
// 1. Validate request
if req.GetVolumeId() == "" {
return nil, status.Errorf(codes.InvalidArgument, "NodePublishVolume - VolumeID is required")
}
if req.GetTargetPath() == "" {
return nil, status.Errorf(codes.InvalidArgument, "NodePublishVolume - TargetPath is required")
}
// ??? req.GetVolumeCapability()
// TODO: Check the FsType is supported by the driver
// This targetpath is deep down in /var/lib/kubelet/pods/....
// As k8s starts a pod that references this FS, that pod will have
// a spec.containers[].volumeMounts that tells k8s where to bind mount
// it into the pod's namespace.
err := os.MkdirAll(req.GetTargetPath(), 0755)
if err != nil && err != os.ErrExist {
return nil, status.Errorf(codes.Internal, "NodePublishVolume - Mountpoint mkdir Failed: Error %v", err)
}
// 2. Verify that it's not yet mounted.
mounter := mount.New("")
isMounted := false
mountpoints, err := mounter.List()
if err != nil {
return nil, status.Errorf(codes.Internal, "NodePublishVolume - List mounts failed: Error %v", err)
}
for idx := range mountpoints {
if mountpoints[idx].Path == req.GetTargetPath() && mountpoints[idx].Device == req.GetVolumeId() {
log.WithField("source", req.GetVolumeId()).WithField("target", req.GetTargetPath()).Info("Already mounted")
isMounted = true
break
}
}
// 3. Perform the mount.
if !isMounted {
err := mounter.Mount(
req.GetVolumeId(),
req.GetTargetPath(),
req.GetVolumeCapability().GetMount().GetFsType(),
req.GetVolumeCapability().GetMount().GetMountFlags())
if err != nil {
return nil, status.Errorf(codes.Internal, "NodePublishVolume - Mount Failed: Error %v", err)
} else {
log.WithField("source", req.GetVolumeId()).WithField("target", req.GetTargetPath()).Info("Mounted")
}
}
return &csi.NodePublishVolumeResponse{}, nil
}
func (s *service) NodeUnpublishVolume(
ctx context.Context,
req *csi.NodeUnpublishVolumeRequest) (
*csi.NodeUnpublishVolumeResponse, error) {
if req.GetVolumeId() == "" {
return nil, status.Errorf(codes.InvalidArgument, "NodeUnpublishVolume - VolumeID is required")
}
if req.GetTargetPath() == "" {
return nil, status.Errorf(codes.InvalidArgument, "NodeUnpublishVolume - TargetPath is required")
}
mounter := mount.New("")
notMountPoint, err := mount.IsNotMountPoint(mounter, req.GetTargetPath())
if err != nil && strings.Contains(err.Error(), "no such") {
// consider it unmounted
} else if err != nil {
return nil, status.Errorf(codes.Internal, "NodeUnpublishVolume - Mount point check Failed: Error %v", err)
} else if !notMountPoint {
err := mounter.Unmount(req.GetTargetPath())
if err != nil {
return nil, status.Errorf(codes.Internal, "NodeUnpublishVolume - Unmount Failed: Error %v", err)
} else {
log.WithField("target", req.GetTargetPath()).Info("Unmounted")
}
}
return &csi.NodeUnpublishVolumeResponse{}, nil
}
func (s *service) NodeGetVolumeStats(
ctx context.Context,
req *csi.NodeGetVolumeStatsRequest) (
*csi.NodeGetVolumeStatsResponse, error) {
return nil, nil
}
func (s *service) NodeExpandVolume(
ctx context.Context,
req *csi.NodeExpandVolumeRequest) (
*csi.NodeExpandVolumeResponse, error) {
return nil, nil
}
func (s *service) NodeGetCapabilities(
ctx context.Context,
req *csi.NodeGetCapabilitiesRequest) (
*csi.NodeGetCapabilitiesResponse, error) {
/*
return &csi.NodeGetCapabilitiesResponse{
Capabilities: []*csi.NodeServiceCapability{
{
Type: &csi.NodeServiceCapability_Rpc{
Rpc: &csi.NodeServiceCapability_RPC{
Type: csi.NodeServiceCapability_RPC_GET_VOLUME_STATS,
},
},
},
},
}, nil
*/
return &csi.NodeGetCapabilitiesResponse{}, nil
}
func (s *service) NodeGetInfo(
ctx context.Context,
req *csi.NodeGetInfoRequest) (
*csi.NodeGetInfoResponse, error) {
return &csi.NodeGetInfoResponse{
NodeId: os.Getenv("KUBE_NODE_NAME"),
}, nil
}