ceph-volume: implement __format__ in Size to format sizes in py3

Signed-off-by: Jan Fajerski <jfajerski@suse.com>
(cherry picked from commit 7a741f201a078dfd9bce34e66ed16bcb37d99f7f)

diff --git a/src/ceph-volume/ceph_volume/util/disk.py b/src/ceph-volume/ceph_volume/util/disk.py
index 49ccdb899d2c61580bbacbcadf3a40ce5c7143dc..2d382606ba2152514bbe2ca6e7af4d28f6e5ccf8 100644 (file)
--- a/src/ceph-volume/ceph_volume/util/disk.py
+++ b/src/ceph-volume/ceph_volume/util/disk.py
@@ -602,6 +602,9 @@ class Size(object):
     def __str__(self):
         return "%s" % self._get_best_format()
 
+    def __format__(self, spec):
+        return str(self._get_best_format()).__format__(spec)
+
     def __lt__(self, other):
         return self._b < other._b