Enable H104, F841 hacking rule and fix violations

This change enables hacking check H104 and F841, and fixes all
violations.

[H104]    Files with no code shouldn’t contain any license header nor
          comments, and must be left completely empty.
[F841]    local variable name is assigned to but never used

Change-Id: If7fcb737d121fd13b2b103d63f5f26dfaa79c59b

cinder/openstack/__init__.py

@@ -1,13 +0,0 @@
-# Copyright (c) 2011 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.

cinder/tests/test_glusterfs.py

@@ -2061,7 +2061,7 @@ class GlusterFsDriverTestCase(test.TestCase):
                          self.TEST_MNT_POINT_BASE)
 
     def test_get_mount_point_base(self):
-        (mox, drv) = self._mox, self._driver
+        drv = self._driver
 
         self.assertEqual(drv._get_mount_point_base(),
                          self.TEST_MNT_POINT_BASE)

cinder/tests/test_ibm_xiv_ds8k.py

@@ -300,9 +300,7 @@ class XIVDS8KVolumeDriverTest(test.TestCase):
         self.driver.do_setup(None)
         self.driver.create_volume(MANAGED_VOLUME)
         existing_ref = {'source-name': MANAGED_VOLUME['name']}
-        has_volume = self.driver.manage_existing(
-            VOLUME,
-            existing_ref)
+        self.driver.manage_existing(VOLUME, existing_ref)
         self.assertEqual(VOLUME['size'], MANAGED_VOLUME['size'])
 
         # cover both case, whether driver renames the volume or not

cinder/tests/test_migrations.py

@@ -165,7 +165,7 @@ class TestMigrations(test.TestCase):
         def execute_cmd(cmd=None):
             proc = subprocess.Popen(cmd, stdout=subprocess.PIPE,
                                     stderr=subprocess.STDOUT, shell=True)
-            output = proc.communicate()[0]
+            proc.communicate()[0]
             self.assertEqual(0, proc.returncode)
 
         for key, engine in self.engines.items():
@@ -1075,7 +1075,7 @@ class TestMigrations(test.TestCase):
             reservations = sqlalchemy.Table('reservations',
                                             metadata,
                                             autoload=True)
-            index_colums = []
+            index_columns = []
             for idx in reservations.indexes:
                 if idx.name == 'reservations_deleted_expire_idx':
                     index_columns = idx.columns.keys()

cinder/volume/drivers/hds/hnas_backend.py

@@ -84,7 +84,7 @@ class HnasBackend():
         for line in lines:
             if 'evs' in line and 'admin' not in line:
                 inf = line.split()
-                (evsnum, evsname, ip) = (inf[1], inf[2], inf[3])
+                (evsnum, ip) = (inf[1], inf[3])
                 newout += "CTL: %s Port: 0 IP: %s Port: 3260 Link: Up\n" \
                           % (evsnum, ip)
 
@@ -112,8 +112,8 @@ class HnasBackend():
                 continue
             if 'GB' in line or 'TB' in line:
                 inf = line.split()
-                (fsid, fslabel, evsnum, capacity, used, perstr) = \
-                    (inf[0], inf[1], inf[2], inf[3], inf[5], inf[7])
+                (fsid, fslabel, capacity, used, perstr) = \
+                    (inf[0], inf[1], inf[3], inf[5], inf[7])
                 (availunit, usedunit) = (inf[4], inf[6])
                 if usedunit == 'GB':
                     usedmultiplier = units.Ki

cinder/volume/drivers/hds/nfs.py

@@ -413,8 +413,8 @@ class HDSNFSDriver(nfs.NfsDriver):
         for line in lines:
             if 'Export' in line:
                 inf = line.split()
-                (export, path, fslabel, hdp, evs, ip1) = \
-                    inf[1], inf[3], inf[5], inf[7], inf[9], inf[11]
+                (export, path, fslabel, hdp, ip1) = \
+                    inf[1], inf[3], inf[5], inf[7], inf[11]
                 # 9, 10, etc are IP addrs
                 key = ip1 + ':' + export
                 conf[key] = {}

tox.ini

@@ -72,7 +72,7 @@ commands = {posargs}
 # F841,H302,H305,H307,H405
 
 
-ignore = E251,E265,F402,F841,H104,H302,H305,H307,H402,H405,H803,H904
+ignore = E251,E265,F402,H302,H305,H307,H402,H405,H803,H904
 builtins = _
 exclude = .git,.venv,.tox,dist,tools,doc,common,*egg,build