Fix incorrect reraising of exceptions

There are several places in the code where exception handling raises
the exception variable rather than just calling raise. This results
in the traceback being incorrect.

Had considered adding a hacking check for this, but that becomes a
little tricky. There are valid places where "raise ex" is used that
would prevent a simple check.

Change-Id: Ib2bd745c7ef600c514a94c3fd638d15d17a623a2

cinder/volume/drivers/emc/emc_vnx_cli.py

@@ -452,7 +452,7 @@ class CommandLineHelper(object):
                         self.CLI_RESP_PATTERN_LUN_NOT_EXIST) >= 0:
                     return False
                 else:
-                    raise ex
+                    raise
             return _lun_state_validation(data)
 
         self._wait_for_a_condition(lun_is_ready,
@@ -2428,7 +2428,7 @@ class EMCVnxCliBase(object):
                 self._client.connect_host_to_storage_group(
                     hostname, storage_group)
             else:
-                raise ex
+                raise
         return hostname
 
     def get_lun_owner(self, volume):
@@ -2629,7 +2629,7 @@ class EMCVnxCliBase(object):
                                                     poll=False)
         except exception.EMCVnxCLICmdError as ex:
             if ex.kwargs["rc"] != 83:
-                raise ex
+                raise
             # Storage Group has not existed yet
             self.assure_storage_group(hostname)
             if self.itor_auto_reg:

cinder/volume/drivers/netapp/dataontap/client/client_7mode.py

@@ -332,7 +332,7 @@ class Client(client_base.Client):
             except netapp_api.NaApiError as e:
                 if e.code != 'UnknownCloneId':
                     self._clear_clone(clone_id)
-                raise e
+                raise
 
     def _wait_for_clone_finish(self, clone_op_id, vol_uuid):
         """Waits till a clone operation is complete or errored out."""

cinder/volume/drivers/netapp/dataontap/nfs_base.py

@@ -206,13 +206,13 @@ class NetAppNfsDriver(nfs.NfsDriver):
             if vol_size != src_vol_size:
                 try:
                     self.extend_volume(volume, vol_size)
-                except Exception as e:
+                except Exception:
                     LOG.error(
                         _LE("Resizing %s failed. Cleaning volume."),
                         volume.name)
                     self._execute('rm', path,
                                   run_as_root=self._execute_as_root)
-                    raise e
+                    raise
         else:
             raise exception.CinderException(
                 _("NFS file %s not discovered.") % volume['name'])

cinder/volume/drivers/nfs.py

@@ -154,7 +154,7 @@ class NfsDriver(remotefs.RemoteFSDriver):
                 msg = _('%s is not installed') % package
                 raise exception.NfsException(msg)
             else:
-                raise exc
+                raise
 
         # Now that all configuration data has been loaded (shares),
         # we can "set" our final NAS file security options.

cinder/volume/drivers/quobyte.py

@@ -117,7 +117,7 @@ class QuobyteDriver(remotefs_drv.RemoteFSSnapDriver):
                 raise exception.VolumeDriverException(
                     'mount.quobyte is not installed')
             else:
-                raise exc
+                raise
 
     def set_nas_security_options(self, is_new_cinder_install):
         self.configuration.nas_secure_file_operations = 'true'

cinder/volume/drivers/rbd.py

@@ -494,10 +494,10 @@ class RBDDriver(driver.RetypeVD, driver.TransferVD, driver.ExtendVD,
                 LOG.debug("creating snapshot='%s'", clone_snap)
                 src_volume.create_snap(clone_snap)
                 src_volume.protect_snap(clone_snap)
-            except Exception as exc:
+            except Exception:
                 # Only close if exception since we still need it.
                 src_volume.close()
-                raise exc
+                raise
 
             # Now clone source volume snapshot
             try:
@@ -508,10 +508,10 @@ class RBDDriver(driver.RetypeVD, driver.TransferVD, driver.ExtendVD,
                 self.RBDProxy().clone(client.ioctx, src_name, clone_snap,
                                       client.ioctx, dest_name,
                                       features=client.features)
-            except Exception as exc:
+            except Exception:
                 src_volume.unprotect_snap(clone_snap)
                 src_volume.remove_snap(clone_snap)
-                raise exc
+                raise
             finally:
                 src_volume.close()
 

cinder/volume/drivers/remotefs.py

@@ -1259,8 +1259,8 @@ class RemoteFSSnapDriver(RemoteFSDriver):
                 snapshot['volume_id'],
                 connection_info)
             LOG.debug('nova call result: %s', result)
-        except Exception as e:
-            LOG.error(_LE('Call to Nova to create snapshot failed %s'), e)
+        except Exception:
+            LOG.exception(_LE('Call to Nova to create snapshot failed'))
             raise
 
         # Loop and wait for result
@@ -1344,8 +1344,8 @@ class RemoteFSSnapDriver(RemoteFSDriver):
                 context,
                 snapshot['id'],
                 delete_info)
-        except Exception as e:
-            LOG.error(_LE('Call to Nova delete snapshot failed %s'), e)
+        except Exception:
+            LOG.exception(_LE('Call to Nova delete snapshot failed'))
             raise
 
         # Loop and wait for result

cinder/volume/drivers/zfssa/restclient.py

@@ -185,9 +185,9 @@ class RestClientURL(object):
                                       message="REST Not Available: \
                                       Please Upgrade")
 
-        except RestClientError as err:
+        except RestClientError:
             del self.headers['authorization']
-            raise err
+            raise
 
     def login(self, auth_str):
         """Login to an appliance using a user name and password.

cinder/volume/drivers/zfssa/zfssanfs.py

@@ -97,7 +97,7 @@ class ZFSSANFSDriver(nfs.NfsDriver):
                 msg = _('%s is not installed') % package
                 raise exception.NfsException(msg)
             else:
-                raise exc
+                raise
 
         lcfg = self.configuration
         LOG.info(_LI('Connecting to host: %s.'), lcfg.san_ip)