ceph-csi/pkg/cephfs/cephconf.go

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/*
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 (
"fmt"
"os"
"path"
"text/template"
"github.com/golang/glog"
)
const cephConfig = `[global]
mon_host = {{.Monitors}}
auth_cluster_required = cephx
auth_service_required = cephx
auth_client_required = cephx
# Workaround for http://tracker.ceph.com/issues/23446
fuse_set_user_groups = false
`
const cephKeyring = `[client.{{.UserID}}]
key = {{.Key}}
`
const cephSecret = `{{.Key}}` // #nosec
const (
cephConfigRoot = "/etc/ceph"
cephConfigFileNameFmt = "ceph.share.%s.conf"
cephKeyringFileNameFmt = "ceph.share.%s.client.%s.keyring"
cephSecretFileNameFmt = "ceph.share.%s.client.%s.secret" // #nosec
)
var (
cephConfigTempl *template.Template
cephKeyringTempl *template.Template
cephSecretTempl *template.Template
)
func init() {
fm := map[string]interface{}{
"perms": func(readOnly bool) string {
if readOnly {
return "r"
}
return "rw"
},
}
cephConfigTempl = template.Must(template.New("config").Parse(cephConfig))
cephKeyringTempl = template.Must(template.New("keyring").Funcs(fm).Parse(cephKeyring))
cephSecretTempl = template.Must(template.New("secret").Parse(cephSecret))
}
type cephConfigData struct {
Monitors string
VolumeID volumeID
}
func writeCephTemplate(fileName string, m os.FileMode, t *template.Template, data interface{}) error {
// #nosec
if err := os.MkdirAll(cephConfigRoot, 0755); err != nil {
return err
}
f, err := os.OpenFile(path.Join(cephConfigRoot, fileName), os.O_CREATE|os.O_EXCL|os.O_WRONLY, m)
if err != nil {
if os.IsExist(err) {
return nil
}
return err
}
defer func() {
if err := f.Close(); err != nil {
glog.Errorf("failed to close file %s with error %s", f.Name(), err)
}
}()
return t.Execute(f, data)
}
func (d *cephConfigData) writeToFile() error {
return writeCephTemplate(fmt.Sprintf(cephConfigFileNameFmt, d.VolumeID), 0640, cephConfigTempl, d)
}
type cephKeyringData struct {
UserID, Key string
VolumeID volumeID
}
func (d *cephKeyringData) writeToFile() error {
return writeCephTemplate(fmt.Sprintf(cephKeyringFileNameFmt, d.VolumeID, d.UserID), 0600, cephKeyringTempl, d)
}
type cephSecretData struct {
UserID, Key string
VolumeID volumeID
}
func (d *cephSecretData) writeToFile() error {
return writeCephTemplate(fmt.Sprintf(cephSecretFileNameFmt, d.VolumeID, d.UserID), 0600, cephSecretTempl, d)
}
func getCephSecretPath(volID volumeID, userID string) string {
return path.Join(cephConfigRoot, fmt.Sprintf(cephSecretFileNameFmt, volID, userID))
}
func getCephKeyringPath(volID volumeID, userID string) string {
return path.Join(cephConfigRoot, fmt.Sprintf(cephKeyringFileNameFmt, volID, userID))
}
func getCephConfPath(volID volumeID) string {
return path.Join(cephConfigRoot, fmt.Sprintf(cephConfigFileNameFmt, volID))
}