code: func GetFsckFunc(ctx context.Context) store.FsckCallback {
  	imf, ok := ctx.Value(ctxKeyFsckFunc).(store.FsckCallback)
  	if !ok || imf == nil {
  		return func(context.Context, string) bool {
  			return true
  		}
  	}
  	return imf
  }
docs: // GetFsckFunc will return the fsck confirmation callback or a default one
  // returning true.
  // Note: will never return nil