Add auth_plugin support to cinderclient

With CINDER_RAX_AUTH being rightfully removed, cinderclient is no longer
compatible with Rackspace/any non-keystone auth. To fix this, I stole
auth_system/auth_plugin from novaclient's implementation.

See https://review.openstack.org/#/c/23820/.

Change-Id: If5f84003f868ef02bb7eb7da67cf62018602e8f0
Closes-Bug: 1280393

1 files changed, 10 insertions, 0 deletions

diff --git a/cinderclient/utils.py b/cinderclient/utils.py
index a941873..018f12a 100644
--- a/cinderclient/utils.py
+++ b/cinderclient/utils.py
@@ -16,6 +16,7 @@
 from __future__ import print_function
 
 import os
+import pkg_resources
 import re
 import sys
 import uuid
@@ -286,6 +287,15 @@ def import_class(import_str):
     __import__(mod_str)
     return getattr(sys.modules[mod_str], class_str)
 
+
+def _load_entry_point(ep_name, name=None):
+    """Try to load the entry point ep_name that matches name."""
+    for ep in pkg_resources.iter_entry_points(ep_name, name=name):
+        try:
+            return ep.load()
+        except (ImportError, pkg_resources.UnknownExtra, AttributeError):
+            continue
+
 _slugify_strip_re = re.compile(r'[^\w\s-]')
 _slugify_hyphenate_re = re.compile(r'[-\s]+')