Add hbaapi path config option

In some cases, a vendor provided hbaapi library must be used for
Fibre Channel related operations.

This patch adds a config option, allowing the deployer to choose
such a library.

Change-Id: I830993e57870039ba2980e69b01952d5427638f2

os_win/conf.py

@@ -0,0 +1,26 @@
+# Copyright 2017 Cloudbase Solutions Srl
+# All Rights Reserved.
+#
+#    Licensed under the Apache License, Version 2.0 (the "License"); you may
+#    not use this file except in compliance with the License. You may obtain
+#    a copy of the License at
+#
+#         http://www.apache.org/licenses/LICENSE-2.0
+#
+#    Unless required by applicable law or agreed to in writing, software
+#    distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+#    WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+#    License for the specific language governing permissions and limitations
+#    under the License.
+
+from oslo_config import cfg
+
+os_win_opts = [
+    cfg.StrOpt('hbaapi_lib_path',
+               default='hbaapi.dll',
+               help='Fibre Channel hbaapi library path. If no custom hbaapi '
+                    'library is requested, the default one will be used.'),
+]
+
+CONF = cfg.CONF
+CONF.register_opts(os_win_opts, 'os_win')

os_win/utils/storage/initiator/fc_utils.py

@@ -23,12 +23,15 @@ from oslo_log import log as logging
 
 from os_win._i18n import _, _LW
 from os_win import _utils
+import os_win.conf
 from os_win import exceptions
 from os_win.utils.storage.initiator import fc_structures as fc_struct
 from os_win.utils import win32utils
 
+CONF = os_win.conf.CONF
+
 if sys.platform == 'win32':
-    hbaapi = ctypes.cdll.hbaapi
+    hbaapi = ctypes.cdll.LoadLibrary(CONF.os_win.hbaapi_lib_path)
 
 LOG = logging.getLogger(__name__)