message: Snapshotter: fix the comment about meta file location
  Fix comment and remove some useless variables.
diff: @@ -9,7 +9,6 @@ package daemon
  import (
  "os"
  "path/filepath"
  - "sync"
  "github.com/pkg/errors"
  @@ -33,12 +32,10 @@ type Daemon struct {
  CacheDir string
  SnapshotDir string
  Pid int
  - client nydussdk.Interface
  ImageID string
  SharedDaemon bool
  ApiSock *string
  RootMountPoint *string
  - mu sync.Mutex
  }
  func (d *Daemon) SharedMountPoint() string {
  @@ -53,14 +50,14 @@ func (d *Daemon) MountPoint() string {
  }
  func (d *Daemon) BootstrapFile() (string, error) {
  - // for backward compatibility check meta file from legacy location
  + // the meta file is stored to <snapshotid>/image/image.boot
  bootstrap := filepath.Join(d.SnapshotDir, d.SnapshotID, "fs", "image", "image.boot")
  _, err := os.Stat(bootstrap)
  if err == nil {
  return bootstrap, nil
  }
  if os.IsNotExist(err) {
  - // meta file has been changed to <snapshotid>/fs/image.boot
  + // for backward compatibility check meta file from legacy location
  bootstrap = filepath.Join(d.SnapshotDir, d.SnapshotID, "fs", "image.boot")
  _, err = os.Stat(bootstrap)
  if err == nil {
  @@ -85,10 +82,6 @@ func (d *Daemon) LogFile() string {
  return filepath.Join(d.LogDir, "stderr.log")
  }
  -func (d *Daemon) binary() string {
  - return "/bin/nydusd"
  -}
  -
  func (d *Daemon) CheckStatus() (model.DaemonInfo, error) {
  client, err := nydussdk.NewNydusClient(d.APISock())
  if err != nil {
  