ceph-csi/pkg/cephfs/volume.go
gman 06f411bbf3 cephfs: volumes are now created for separate ceph users with limited access to fs
Uses a slightly modified version of https://github.com/kubernetes-incubator/external-storage/blob/master/ceph/cephfs/cephfs_provisioner/cephfs_provisioner.py
This should be rewritten properly in Go, but for it works for now - for demonstration purposes

TODO:
* readOnly is not taken into account
* controllerServer.DeleteVolume does nothing
2018-03-09 17:05:19 +01:00

108 lines
2.8 KiB
Go

/*
Copyright 2018 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 cephfs
import (
"encoding/json"
"fmt"
"os"
"os/exec"
)
const (
// from https://github.com/kubernetes-incubator/external-storage/tree/master/ceph/cephfs/cephfs_provisioner
provisionerCmd = "/cephfs_provisioner.py"
userPrefix = "user-"
)
type volume struct {
Root string `json:"path"`
User string `json:"user"`
Key string `json:"key"`
}
func newVolume(volId *volumeIdentifier, volOpts *volumeOptions) (*volume, error) {
cmd := exec.Command(provisionerCmd, "-n", volId.id, "-u", userPrefix+volId.id)
cmd.Env = []string{
"CEPH_CLUSTER_NAME=" + volOpts.ClusterName,
"CEPH_MON=" + volOpts.Monitor,
"CEPH_AUTH_ID=" + volOpts.AdminId,
"CEPH_AUTH_KEY=" + volOpts.AdminSecret,
}
out, err := cmd.CombinedOutput()
if err != nil {
return nil, fmt.Errorf("cephfs: an error occurred while creating the volume: %v\ncephfs: %s", err, out)
}
fmt.Printf("\t\tcephfs_provisioner.py: %s\n", out)
vol := &volume{}
if err = json.Unmarshal(out, vol); err != nil {
return nil, fmt.Errorf("cephfs: malformed json output: %s", err)
}
return vol, nil
}
func (vol *volume) mount(mountPoint string) error {
out, err := execCommand("ceph-fuse", mountPoint, "-n", vol.User, "-r", vol.Root)
if err != nil {
return fmt.Errorf("cephfs: ceph-fuse failed with following error: %s\ncephfs: cephf-fuse output: %s", err, out)
}
return nil
}
func (vol *volume) unmount() error {
out, err := execCommand("fusermount", "-u", vol.Root)
if err != nil {
return fmt.Errorf("cephfs: fusermount failed with following error: %v\ncephfs: fusermount output: %s", err, out)
}
return nil
}
func (vol *volume) makeMap() map[string]string {
return map[string]string{
"path": vol.Root,
"user": vol.User,
}
}
func unmountVolume(root string) error {
out, err := execCommand("fusermount", "-u", root)
if err != nil {
return fmt.Errorf("cephfs: fusermount failed with following error: %v\ncephfs: fusermount output: %s", err, out)
}
return nil
}
func deleteVolume(volId, user string) error {
out, err := execCommand(provisionerCmd, "--remove", "-n", volId, "-u", user)
if err != nil {
return fmt.Errorf("cephfs: failed to delete volume %s following error: %v\ncephfs: output: %s", volId, err, out)
}
return nil
}
func createMountPoint(root string) error {
return os.MkdirAll(root, 0750)
}