use encode('utf8') instead of str()

It is not clear for converting a unicode to string by using str().
Instead we should use var.encode('utf8') to do this.

Change-Id: I8ce4c98f819c98e835a6d8298fe22f2fd0ca18b6

diff --git a/cinder/backup/drivers/ceph.py b/cinder/backup/drivers/ceph.py
index d9c7341946d3cb8eb2344942a53ef7a987ab4ccf..c7d2c7b8e62bbdb27d68ef95220ee2a0ec7bc56f 100644 (file)
--- a/cinder/backup/drivers/ceph.py
+++ b/cinder/backup/drivers/ceph.py
@@ -112,9 +112,11 @@ class CephBackupDriver(BackupDriver):
             self.rbd_stripe_count = 0
             self.rbd_stripe_unit = 0
 
-        self._ceph_backup_user = str(CONF.backup_ceph_user)
-        self._ceph_backup_pool = str(CONF.backup_ceph_pool)
-        self._ceph_backup_conf = str(CONF.backup_ceph_conf)
+        _utf8 = lambda s: s if isinstance(s, str) else s.encode('utf8')
+
+        self._ceph_backup_user = _utf8(CONF.backup_ceph_user)
+        self._ceph_backup_pool = _utf8(CONF.backup_ceph_pool)
+        self._ceph_backup_conf = _utf8(CONF.backup_ceph_conf)
 
     def _validate_string_args(self, *args):
         """Ensure all args are non-None and non-empty."""