222 lines
6.1 KiB
Go
222 lines
6.1 KiB
Go
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/*
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Copyright 2015 The Kubernetes Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package flexvolume
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import (
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"encoding/json"
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"errors"
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"fmt"
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"github.com/golang/glog"
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"k8s.io/kubernetes/pkg/util/exec"
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)
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const (
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initCmd = "init"
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attachCmd = "attach"
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detachCmd = "detach"
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mountCmd = "mount"
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unmountCmd = "unmount"
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optionFSType = "kubernetes.io/fsType"
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optionReadWrite = "kubernetes.io/readwrite"
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optionKeySecret = "kubernetes.io/secret"
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)
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const (
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// StatusSuccess represents the successful completion of command.
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StatusSuccess = "Success"
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// StatusFailed represents that the command failed.
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StatusFailure = "Failed"
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// StatusNotSupported represents that the command is not supported.
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StatusNotSupported = "Not supported"
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)
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// FlexVolumeDriverStatus represents the return value of the driver callout.
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type FlexVolumeDriverStatus struct {
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// Status of the callout. One of "Success" or "Failure".
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Status string
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// Message is the reason for failure.
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Message string
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// Device assigned by the driver.
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Device string `json:"device"`
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}
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// flexVolumeUtil is the utility structure to setup and teardown devices from
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// the host.
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type flexVolumeUtil struct{}
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// isCmdNotSupportedErr checks if the error corresponds to command not supported by
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// driver.
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func isCmdNotSupportedErr(err error) bool {
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if err.Error() == StatusNotSupported {
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return true
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}
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return false
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}
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// handleCmdResponse processes the command output and returns the appropriate
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// error code or message.
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func handleCmdResponse(cmd string, output []byte) (*FlexVolumeDriverStatus, error) {
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var status FlexVolumeDriverStatus
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if err := json.Unmarshal(output, &status); err != nil {
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glog.Errorf("Failed to unmarshal output for command: %s, output: %s, error: %s", cmd, output, err.Error())
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return nil, err
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} else if status.Status == StatusNotSupported {
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glog.V(5).Infof("%s command is not supported by the driver", cmd)
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return nil, errors.New(status.Status)
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} else if status.Status != StatusSuccess {
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errMsg := fmt.Sprintf("%s command failed, status: %s, reason: %s", cmd, status.Status, status.Message)
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glog.Errorf(errMsg)
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return nil, fmt.Errorf("%s", errMsg)
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}
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return &status, nil
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}
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// init initializes the plugin.
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func (u *flexVolumeUtil) init(plugin *flexVolumePlugin) error {
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// call the init script
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output, err := exec.New().Command(plugin.getExecutable(), initCmd).CombinedOutput()
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if err != nil {
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glog.Errorf("Failed to init driver: %s, error: %s", plugin.driverName, err.Error())
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_, err := handleCmdResponse(initCmd, output)
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return err
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}
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glog.V(5).Infof("Successfully initialized driver %s", plugin.driverName)
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return nil
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}
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// Attach exposes a volume on the host.
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func (u *flexVolumeUtil) attach(f *flexVolumeMounter) (string, error) {
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execPath := f.execPath
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var options string
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if f.options != nil {
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out, err := json.Marshal(f.options)
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if err != nil {
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glog.Errorf("Failed to marshal plugin options, error: %s", err.Error())
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return "", err
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}
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if len(out) != 0 {
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options = string(out)
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} else {
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options = ""
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}
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}
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cmd := f.runner.Command(execPath, attachCmd, options)
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output, err := cmd.CombinedOutput()
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if err != nil {
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glog.Errorf("Failed to attach volume %s, output: %s, error: %s", f.volName, output, err.Error())
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_, err := handleCmdResponse(attachCmd, output)
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return "", err
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}
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status, err := handleCmdResponse(attachCmd, output)
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if err != nil {
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return "", err
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}
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glog.Infof("Successfully attached volume %s on device: %s", f.volName, status.Device)
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return status.Device, nil
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}
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// Detach detaches a volume from the host.
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func (u *flexVolumeUtil) detach(f *flexVolumeUnmounter, mntDevice string) error {
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execPath := f.execPath
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// Executable provider command.
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cmd := f.runner.Command(execPath, detachCmd, mntDevice)
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output, err := cmd.CombinedOutput()
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if err != nil {
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glog.Errorf("Failed to detach volume %s, output: %s, error: %s", f.volName, output, err.Error())
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_, err := handleCmdResponse(detachCmd, output)
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return err
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}
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_, err = handleCmdResponse(detachCmd, output)
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if err != nil {
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return err
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}
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glog.Infof("Successfully detached volume %s on device: %s", f.volName, mntDevice)
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return nil
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}
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// Mount mounts the volume on the host.
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func (u *flexVolumeUtil) mount(f *flexVolumeMounter, mntDevice, dir string) error {
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execPath := f.execPath
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var options string
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if f.options != nil {
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out, err := json.Marshal(f.options)
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if err != nil {
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glog.Errorf("Failed to marshal plugin options, error: %s", err.Error())
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return err
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}
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if len(out) != 0 {
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options = string(out)
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} else {
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options = ""
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}
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}
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// Executable provider command.
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cmd := f.runner.Command(execPath, mountCmd, dir, mntDevice, options)
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output, err := cmd.CombinedOutput()
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if err != nil {
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glog.Errorf("Failed to mount volume %s, output: %s, error: %s", f.volName, output, err.Error())
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_, err := handleCmdResponse(mountCmd, output)
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return err
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}
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_, err = handleCmdResponse(mountCmd, output)
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if err != nil {
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return err
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}
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glog.Infof("Successfully mounted volume %s on dir: %s", f.volName, dir)
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return nil
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}
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// Unmount unmounts the volume on the host.
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func (u *flexVolumeUtil) unmount(f *flexVolumeUnmounter, dir string) error {
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execPath := f.execPath
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// Executable provider command.
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cmd := f.runner.Command(execPath, unmountCmd, dir)
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output, err := cmd.CombinedOutput()
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if err != nil {
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glog.Errorf("Failed to unmount volume %s, output: %s, error: %s", f.volName, output, err.Error())
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_, err := handleCmdResponse(unmountCmd, output)
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return err
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}
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_, err = handleCmdResponse(unmountCmd, output)
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if err != nil {
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return err
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}
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glog.Infof("Successfully unmounted volume %s on dir: %s", f.volName, dir)
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return nil
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}
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