etcdctlCmd.Stdout = os.Stdout
	etcdctlCmd.Stderr = os.Stderr
	return etcdctlCmd.Run()
}

// AttachLease attaches leases of the given leaseDuration to all the  etcd objects under
// ttlKeysDirectory specified in this client's config.
func (e *CombinedEtcdClient) AttachLease(leaseDuration time.Duration) error {
	ttlKeysPrefix := e.cfg.ttlKeysDirectory

	Backup(version *EtcdVersion, backupDir string) error
	Snapshot(version *EtcdVersion, snapshotFile string) error
	Restore(version *EtcdVersion, snapshotFile string) error
	Migrate(version *EtcdVersion) error
	AttachLease(leaseDuration time.Duration) error
	Close() error
}

// Migrator manages etcd data migrations.
type Migrator struct {
	cfg           *EtcdMigrateCfg // TODO: don't wire this directly in
	dataDirectory *DataDirectory