Remove udevadm from rootwrap

Use oslo.privsep for udevadm

Change-Id: Ib89354c9555c4b2c9f5a8331a788d7fe4ac46694
Signed-off-by: Chuck Short <chucks@redhat.com>

cinder/brick/local_dev/lvm.py

@@ -28,6 +28,7 @@ from oslo_utils import excutils
 from six import moves
 
 from cinder import exception
+import cinder.privsep.lvm
 from cinder import utils
 
 
@@ -705,9 +706,7 @@ class LVM(executor.Executor):
         """
 
         def run_udevadm_settle():
-            self._execute('udevadm', 'settle',
-                          root_helper=self._root_helper, run_as_root=True,
-                          check_exit_code=False)
+            cinder.privsep.lvm.udevadm_settle()
 
         # LV removal seems to be a race with other writers or udev in
         # some cases (see LP #1270192), so we enable retry deactivation

cinder/privsep/lvm.py

@@ -0,0 +1,26 @@
+# Copyright 2018 Red Hat, Inc
+#
+#    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.
+
+"""
+Helpers for lvm related routines
+"""
+
+from oslo_concurrency import processutils
+
+import cinder.privsep
+
+
+@cinder.privsep.sys_admin_pctxt.entrypoint
+def udevadm_settle():
+    processutils.execute('udevadm', 'settle')

etc/cinder/rootwrap.d/volume.filters

@@ -103,8 +103,6 @@ ln: CommandFilter, ln, root
 qemu-img: EnvFilter, env, root, LC_ALL=C, qemu-img
 qemu-img_convert: CommandFilter, qemu-img, root
 
-udevadm: CommandFilter, udevadm, root
-
 # cinder/volume/nfs.py
 stat: CommandFilter, stat, root
 mount: CommandFilter, mount, root